2016年12月28日星期三
2016年12月27日星期二
Analyses the performance difference between axial flow and mixed flow pump
From the principle of work, after the prime mover to drive the impeller rotation, to the effect of liquid there are both centrifugal and axial thrust, is a combination of centrifugal pumps and axial flow pump. So it is a pump between centrifugal pumps and axial flow pump. Mixed flow pump specific speed centrifugal pump prep above, below the axial flow pump, generally between 300-500. Its head is higher than axial flow pump, but lower than the centrifugal pump flow is smaller than axial flow pump, is bigger than a centrifugal pump.
Mixed flow pump are both axial and radial synthesis with the impeller rotating center into an oblique Angle. Under the same flow, axial flow pump head is lower than mixed flow pump. May be expensive because of axial flow pump is vertical, and that cheap mixed flow pump may be horizontal volute (because the flow rate of 1 m3 / S or 3600 m3 / h, is very small for axial flow mixed flow pump, mixed-flow pump, therefore, may be horizontal volute.
weihu mixed flow pump with centrifugal pump and the advantages of axial flow pump, simple structure, high efficient area wide, easy to use, apply to the original embankment areas of farmland irrigation and drainage pumping station. China's development of the mixed flow pump, head of volute 5 ~ 12 m, flow rate of 900 ~ 4000 m3 / h. Guide vane lift 3 ~ 25.7 m, traffic 45 ~ 20160 m3 / h.
Analysis of Model Characteristics of Mixed Flow Pump
Mixed flow pump flow and lift between the centrifugal pump and axial flow between the pump. Small size, light weight, high efficiency, and efficient area wide, simple structure, easy to use, easy maintenance. Transmission medium for water or similar to water, suitable for agricultural drainage and industrial water supply and drainage.
HW-type mixed-flow pump in the HB-based on the development of the pump structure is basically the same with the HB, form and basic parameters by GB / TB008, JB / T6667 standard design, manufacture, acceptance.
Mixed-flow pump is a "pull-out" structure pump, QH series submersible mixed flow pump is designed for large flow, low head design submersible axial flow pump head is generally 10 meters. This product is the best replacement of the traditional axial flow pump, motor and pump constitute one, dive into the water to run, with a traditional unit can not match a series of advantages.
Mixed flow pump running in the water, water flow from the motor around, low noise, the motor cooling conditions. Can be built underground pump station, to maintain the ground surface style. The use of submersible pumps, is to solve the water level fluctuations in the big riverside, lakes and pumping stations and flood control problems the most thorough way, eliminating the pump between the long axis, improve the operational safety and reliability
HW-type mixed-flow pump in the HB-based on the development of the pump structure is basically the same with the HB, form and basic parameters by GB / TB008, JB / T6667 standard design, manufacture, acceptance.
Mixed-flow pump is a "pull-out" structure pump, QH series submersible mixed flow pump is designed for large flow, low head design submersible axial flow pump head is generally 10 meters. This product is the best replacement of the traditional axial flow pump, motor and pump constitute one, dive into the water to run, with a traditional unit can not match a series of advantages.
Mixed flow pump running in the water, water flow from the motor around, low noise, the motor cooling conditions. Can be built underground pump station, to maintain the ground surface style. The use of submersible pumps, is to solve the water level fluctuations in the big riverside, lakes and pumping stations and flood control problems the most thorough way, eliminating the pump between the long axis, improve the operational safety and reliability
Mixed flow pump instructions
Mixed flow pump:
1. Features: simple structure, reliable operation, easy to decorate, and high efficiency, small size, light weight. 2. Drive way: there is a direct driving and variable speed drive. Commonly used engine is a diesel engine and electric motor. When placing order, shall specify the power generator model (power, revolution), in order to determine the coupling or of the specifications of the pulley. Import, 3. The direction of water pump: the pump impeller is commonly counterclockwise, hw (650-5, 7, and 10 pump is clockwise).
Mixed flow pump lift higher than axial flow pump, lower than the centrifugal pump; And flow rate is smaller than axial flow pump, centrifugal pump, so that we in the choice of these pumps, can adjust measures to local conditions, according to the need to choose appropriate pump type.
Mixed flow pump in this change, the change rule of the above if it is low head mixed flow pump, the performance parameters of the change rule between the close to axial flow pump, in use, unfavorable use valve starts, but should open valve to start, when the power is small, the motor is not easy to burn.
2016年12月9日星期五
2016年12月8日星期四
Remove submersible pump and three steps of installation
Remove submersible pump and three steps of installation
1. With hoisting equipment will pump hanging into the pit in place, good cushion pad iron, wear a good foundation bolt, adjust the water pump base plate elevation and horizontal, tighten the anchor bolts, review elevation and level, and strive to ensure consistent with the design requirements.
2. The requirements for installation of the anchor bolt, anchor bolt should be installed before the oil and dirt on the carefully cleaned. Bolt and washer, washer and water pump base contact surface should be smooth, no burr, miscellaneous debris. The anchor bolt fastening should reach 75% of the specified strength in concrete after, when the fastening nut and bolts must be exposed nut 1.5-5 a pitch.
3. The local foot bolts in accordance with requirements tightened immediately with cement mortar will be between the base and the foundation slot embedded fill full, and then concrete is the base of space fill tamped to ensure the stability of the foundation.
Submersible pump needs to repair parts
Submersible pump needs to repair parts
The main contents of the pump are as follows:
1. View and handle easy loose bolt or nut. Such as to knock at a door, a bolt, a pin shaft and a pin, double suction centrifugal pump shaft sealing device for packing tightness, air compressor valve plate.
2. Oil, water, air pipe joint, valve leakage treatment.
3. For the motor carbon brush and slip ring, insulation etc..
4. See rack before without water blocking debris.
5. Adhere to the motor boring, view motor insulation.
6. Repair gate lifting point is not strong, the door has no corrosion and wear resistance, card.
7. The gate opening and closing equipment protection.
8. Crane protection.
9. Unit equipment cleaning.
Ordinary protection of submersible pump
All kinds of Submersible pump type timing of Submersible pump and its control system to protect all maintenance, at least do l all preventive maintenance and repair, including: boot oscillation and voltage and current abnormal movement, launch device operation is not normal, over temperature alarm, Water Leakage is control the multiplex protection not often action, main cable and cable control element aging crack, the main contactor is stuck burrs, oxidation or thermal relay settings are not correct, the winding insulation layer without signs of aging, the insulation resistance is too low, the three-phase winding resistance is not balanced, stator rotor ask is not sweeping or scratches control system, liquid level meter is not accurate, on the lower limit of the output is not normal and reliable, the floating ball action is not reliable, the temperature detection element is not aging, malfunction of oil Emulsion, mechanical seal is not intact, the bearing wear, impeller with and without abrasion and cavitation, axis is not rust deformation or wear, motor inside and outside fastening screws with and without loose debris removal and cooling jacket and a circulating water pipe, pump around the L1 and without sediment or blocking etc..
2016年12月7日星期三
Structure and working principle of mixed flow pump
1. Working principle:
When the original motivation to drive the impeller rotation, the role of the liquid is both centrifugal force and axial thrust, centrifugal pump and axial flow pump comprehensive, liquid to flow out of the impeller. So it is a kind of pump between the centrifugal pump and axial flow pump. Mixed flow pump than the speed higher than the centrifugal pump, lower than the axial flow pump, generally between 300-500. Its head is higher than the axial flow pump, but the flow rate is smaller than the axial flow pump, larger than the centrifugal pump. Seal packing seal or mechanical seal. Material is corrosion-resistant material.
2. Application scope:
Used for conveying clean and contaminated media, chemically neutral or aggressive media. Forced circulation, seawater aquaculture, urban gas engineering, water treatment system in chemical industry process.
3. Design features:
Mixed flow pump is to open a "pulling" type structure of the pump, check and disassembling the impeller and shaft seal, no and the pump body is connected with the pipeline. The pump shaft is equipped with precision machining, with thin oil lubrication bearing, shaft sleeve is arranged in the stuffing box cover. Oil bearing box, a constant level oiler to control. Pump body of the foot, can withstand any load from the pipeline, and the direct transmission to the foundation. In this way, the rotor will not be subjected to load due to the pump bending, so as to ensure the best use of the bearing life. Due to the larger flow area, thereby reducing the blocking. The direction of rotation of the pump, from the driver side to see, for the clockwise direction. Motor or internal combustion engine driven by power. The pump device can be equipped with a complete bleeding device, which is beneficial to the exhaust of the suction pipe.
Comparison of the performance of mixed flow pump and centrifugal pump and axial flow pump
Mixed flow pump from the shape and structure are between the centrifugal pump and axial flow pump.
Mixed flow pump principle, the high speed rotation of the impeller, both the centrifugal force generated by the centrifugal pump, but also with the axial flow pump to push the lift, mixed flow pump by the mixing of the two kinds of force and pumping.
Mixed flow pump performance is also between the centrifugal pump and axial flow pump, and it is compared with the centrifugal pump, head low, and the flow is larger; it is compared with the axial flow pump, head higher, but the flow is smaller. This is a vast territory, the terrain is complex, more than one type of pump to adjust to local conditions.
The performance of mixed flow pump is expressed by operating parameters. For example, flow, head, power, efficiency, speed, etc.. Under a certain speed, the flow is variable, that is, if you change the flow of the pump, the pump head, power and efficiency and so on. The change law of this kind of mutual relation, the synthesis draws several curves to express, this is the water pump performance curve.
Mixed flow pump performance curve shape is also a range of centrifugal pump and axial flow pump in between, mixed flow pump for high head, the flow and head, flow and power of the relationship between the variation is close to centrifugal pumps, in use can be used to close the valve gate start, when the minimum power, power machine safety. For low head mixed flow pump, the variation between the performance parameters is close to axial flow pump, in use, should not be used to start off valve, but should start to open the valve, when power is relatively small, the motor is not easy to be burned.
Overview of axial flow deep well pump
1. Axial flow of deep well water pump should be installed in the well, the submerged depth should meet the requirements for its reliable operation, in the pump unit flow for the design flow of 150%, the minimum submergence depth should be is the first water pump impeller at the bottom of the water level above the line less than 3.20M, and altitude for each additional 300m, deep well pump minimum submergence depth should be increased at least 0.30m;
2. Axis flow of deep well pump is installed in the fire water tank, fire water, its first water pump impeller bottom should the lowest effective water line fire water tank below the and submerged depth should be according to the hydraulic conditions determined by calculation, and should meet the fire pool fire water storage content and effective water can be fully utilized; when the water pump design flow is greater than the 125L/S should according to the pump unit properties to determine the depth of submergence, and should meet the requirements of water pump cavitation allowance;
3. When the fire pool to the lowest level lower than centrifugal water pump outlet pipe center line or the water level can not guarantee the centrifugal pump suction, the axial flow pump for deep well and should use wet pit installation installation on the fire water tank, fire water;
4 when the flow of deep well pump motor open set, function should be rain.
Daily maintenance of submersible pump
Daily maintenance of submersible pump
1. After the pump is removed, the sequence can be decomposed :
After the decomposition of parts should be cleaned, and then one by one check to see if there are cracks, damage and wear and other defects, if there is a serious defect, should be replaced. If the clearance of the bearing is more than 0.10 mm, the new bearing should be replaced.
2. See seal wear :
If the seal wear groove, available emery cloth smooth; if too much wear should be replaced. Seal seat if coarse scratches, available plane or repair reamer in the lathe, the overhaul should replace the new water seal component.
3. When the pump has the following damage, allowing the welding repair :
Such as the length of the less than 30 mm in and do not extend to the bearing seat hole crack; and cylinder head joint flange of a breaking part; oil seal seat hole damage.
4. Check pump bearing:
Check whether the rotation is flexible or abnormal sound, if there is a problem that bearing, should be replaced.
5. After the pump is assembled:
After the pump is assembled with a hand rotation, the pump shaft should be no stuck, impeller and pump shell should not touch the rub. Then check the pump discharge, if there is a problem, should check the cause and rule out. If the pump fails, the coolant will not be able to reach the corresponding place, its performance will not be effective play, and ultimately affect the engine work.
Classification of clear water pumps
1. Self suction water pump:
Water quality good relatively fixed working position, the absorption process in 3.5 meters pipeline stability, can reduce water pump in water and living water supply, irrigation in orchard with water filled trouble, the actual head at 22 meters below, work efficiency slightly worse chemical pump. First run should be added to the cycle of water, the clear water pump to complete the self priming.
2. The water filling type clear water pump:
Water quality good mobility pipeline relatively fixed, suction 2.5 meters the actual head in 32 meters, water pump flow can be according to arbitrarily regulate, to adapt to the mango specialist for spraying pesticide, water supply, irrigation, high work efficiency. Water suction pipe should ensure good sealing.
3. Submersible water pump:
Water supply sufficient head low, the valve is suitable for irrigation of farmland orchard water. Due to Submersible pump into the water to work in the axial push up water, reducing the amount of water will increase the pump load. So do not install the valve on the water outlet pipe of the Submersible pump, prevent the valve closed on pump resistance is too large to burn out the motor.
Centrifugal slurry pump
Centrifugal slurry pump is a device which can directly obtain energy by rotating the impeller blades.
Characteristics of centrifugal slurry pump:
1. Wide application of pump flow.
2. The centrifugal slurry pump has a wide adaptability to material.
3. Delivery head is relatively low
4. More vulnerable parts, more frequent replacement.
5. The centrifugal pump is simple in structure, light in equipment, easy to operate, low cost and wide application.
6. Centrifugal slurry pump and volumetric efficiency is relatively low.
2016年12月6日星期二
Application of chemical mixed flow pump
Chemical mixed-flow pump is mainly used in large capacity, low head, can transport corrosive neutral cleaning medium or medium containing particles.It to economic effectively conveying flow, low head, uniform or containing a certain particles, chemical, neutral or corrosive liquid.
The performance of mixed flow pump
Mixed flow pump types and structure:
Mixed flow pump is generally divided into two types: guide vane mixed flow pump and spiral case type mixed flow pump. Volute mixed flow pump system consists of a bearing body, a pump body, impeller, pump shaft seal device and pump cover etc.. Guide vane mixed flow pump is also called the diagonal flow pump. Vane type mixed flow pump and spiral case type difference mainly in the pump body, vane type mixed flow pump generally set a few usually twisted blade type space guide vane device. After the liquid flows through the impeller, the liquid flows along the axial direction. Pump body looks like a drum with a big belly drum shape, compared with the axial flow pump. This kind of pump is generally divided into two types: internal structure is basically the same vertical and horizontal,. General large diameter vertical more. Small diameter vertical guide vane mixed flow pump and centrifugal shallow well pump is similar, the pump is often referred to as the mixed flow type of agricultural drainage pump. Mainly because of simple structure, easy to move, suitable for farmland irrigation.
Mixed flow pump working principle:
Due to the mixed flow pump is composed of centrifugal and axial flow pump, so when the impeller in the prime mover driven by rotation, the force of liquid is two-way, both axial thrust and centrifugal force. So it is a kind of pump between the axial flow pump and the centrifugal pump. When the mixed flow pump speed is lower than the axial flow pump, higher than the centrifugal pump, usually between 300-500. At this time the head is higher than the axial flow pump, but the flow rate than the axial flow pump is smaller than the centrifugal pump. In addition to the use of mixed flow pump as agricultural irrigation, often is used in city drainage, can be used as the circulating water pump in thermal power station.
Characteristics of mixed flow pump
Mixed flow pump to consider the transport medium for some of the erosion or natural causes of erosion, it is the construction of a material hard to use some of the corrosion resistance of the material. It is an easy pull type structure of the pump, general centrifugal pump, axial flow pump maintenance and disassembling the impeller and the seal must will be connected in the pipeline of the pump body apart, and mixed flow pump is save the process. Mixed flow pump is not only provided with the diluted oil lubrication of bearings and after precision machining of the pump shaft, in filler cover equipped with protective sleeve. It is generally the seal or seal packing seal with double end mechanical. Oil bearing box, there is a constant level oiler to control. Pump body with legs used to bear loads on all pipe, and will be subject to force transmission to infrastructure, the leg, the rotor from oppression of the bearing load of the pump caused by the bending. Therefore, support feet of the pump body of the rotor to the protection of the role, and the service life of the rotor is greatly increased. Mixed flow pump has a relatively large flow area, more smooth, can reduce the blockage of the transmission medium. The rotation direction of the pump shaft is clockwise along the driving direction. Provide the driving force of the device most of the motor or internal combustion engine. Mixed flow pump device generally will install more complete bleeding device, through the device can be effective to pump the gas discharge, to prevent pump does not look.
Specific performance parameters of mixed flow pump
We all know that the mixed flow pump is a pump body of a different type, the function and characteristic of is combined with the performance and characteristics of centrifugal pump, also with axial flow pump the some properties and characteristics, and the contrast to the centrifugal and axial flow pump, mixed flow pump suitable for use range more widely, with stronger practicality, because this is the use of one of the most widespread type of pump. But do you know the specific performance parameters of mixed flow pump is what? I trust scores of consumers for the mixed flow pump of specific performance parameters are not very understanding, so in order to let everyone fully understand to mixed flow pump of specific performance, in the following, the careful for everybody introduction:
First we will is mixed flow pump flow volume, the average flow and mixed flow pump is often large, every hour can reach nearly twenty thousand cubic meters of traffic;
Lift, then said to the mixed flow pump generally mixed flow pump head is also in accordance with the hour to calculate, the maximum lift it can reach nearly three meters per hour; then we will all requirements for the office of mixed flow pump pressure, and other products and facilities for the same office, pressure volume, mixed flow pump has its own unique special requirements, because of the mixed flow pump in order to ensure the normal office can, must ensure that the office of background pressure not more than a fixed office pressure, is said not to be a little over zero MPa;
Finally we look at the popularity of the mixed flow pump for the work environment Temperature requirements, generally speaking, it for the size of the working environment temperature is a large temperature range. For example, it for the minimum requirements for the working environment temperature is zero, but the working environment of the maximum temperature should not exceed 80 degrees, so be sure to note the actual temperature to meet its requirements
The use and maintenance of mixed flow pump
1. To carefully check the use of the mixed flow pump when there is no impact and friction, if there can be friction or impact on the parts and add some paper pad, but also the best to ensure that the use of a certain gap.
2. At the same time to pay attention to monitor the temperature of the bearing, the general bearing temperature can not be greater than 80 degrees Celsius and can not be greater than the background temperature of 40.
3. Packing must should pay attention to the right, not too tight or too loose, common to ensure liquid from the packing gland at a drop of discontinuous leakage.
4. Note from time to time seizing inlet pipe can not appear leakage phenomenon.
5. The should pay attention to the motor and the pump should pay attention to protection of two petition axis line in a straight line.
6. Of seizing power and flow changes, both changes can not touch too much, too much demand investigation sparks.
7. Bearing lubrication oil to note with lubricating grease, as early as possible supply oil quantity; thin oil lubricating oil demand investigation and control body bearing oil benchmark second marking.
8. In the winter , after parking should be as early as possible will release the water pump and pipeline memory.
9. The regular inspection device pump to prevent relaxation.
10. Note that the collapse of checked protection and regular oil changes to make antirust disposed to pump by after a certain period of time .
Specific performance parameters of mixed flow pump
We all know that the mixed flow pump is a pump body of a different type, the function and characteristic of is combined with the performance and characteristics of centrifugal pump, also with axial flow pump the some properties and characteristics, and the contrast to the centrifugal and axial flow pump, mixed flow pump suitable for use range more widely, with stronger practicality, because this is the use of one of the most widespread type of pump. But do you know the specific performance parameters of mixed flow pump is what? I trust scores of consumers for the mixed flow pump of specific performance parameters are not very understanding, so in order to let everyone fully understand to mixed flow pump of specific performance, in the following, the careful for everybody introduction:
First we will is mixed flow pump flow volume, the average flow and mixed flow pump is often large, every hour can reach nearly twenty thousand cubic meters of traffic;
Lift, then said to the mixed flow pump generally mixed flow pump head is also in accordance with the hour to calculate, the maximum lift it can reach nearly three meters per hour; then we will all requirements for the office of mixed flow pump pressure, and other products and facilities for the same office, pressure volume, mixed flow pump has its own unique special requirements, because of the mixed flow pump in order to ensure the normal office can, must ensure that the office of background pressure not more than a fixed office pressure, is said not to be a little over zero MPa;
Finally we look at the popularity of the mixed flow pump for the work environment Temperature requirements, generally speaking, it for the size of the working environment temperature is a large temperature range. For example, it for the minimum requirements for the working environment temperature is zero, but the working environment of the maximum temperature should not exceed 80 degrees, so be sure to note the actual temperature to meet its requirements
Energy saving method for agricultural water pump
1. Water pump inclined loading, detract from the elbow. Inclined to install the pump or spiral case, the water outlet is on the pond.
2. Reduce the pipeline. Remove 1 meters of steel pipe, 10 hours to save diesel 0.21 kg.
3. The expansion of the outlet pipe diameter. 4 meters long 10 cm water hose for 15 cm tube, 10 hours to save diesel 0.5 kg.
4. In the water can maintain the cleaning of the things, can remove the filter.
5. Change the ring, the adjustment of the axial gap. Avoid the impeller ring and the axial gap is not appropriate, the use of the pump should be based on the factory to explain the commissioning.
6. As early as possible eliminate pipeline congestion. Foreign bodies remain in the inlet pipe, impeller or diversion shell flow channel, will be used to water.
7. To avoid the pump intake. The pump into the air, the water will be the surface impairment for the tightly closed part of seizing protection.
8. Think appropriate and use coupling direct drive replacement flat belt, can increase the transmission rate.
9. Eliminate the "gun" type outlet. This increase in energy delivery.
Installation of submersible axial flow pump
Installation of submersible axial flow pump
1. The commissioning of a good pump to the lifting of the re.
2. Don't put the cable when the hoisting rope, no drag!
3. Attention to the installation of anti rotation device is properly installed.
The first routine check before installation, including visual inspection and inspection instruments, especially the need to check the motor insulation resistance. Re commissioning and then lift the pump to the good. And pay attention to prevent the rotation of the device is installed in place. Drag and drop cable. Connect cable.
Two methods to improve the sealing of mixed flow pump
Two methods to improve the sealing of mixed flow pump
1. Packingseal :
Packing is the most commonly used a seal device, it is composed of a bottom lining ring, packing, seal ring, a water sealing pipe and packing gland, such as spare parts. The compaction degree of filler used to adjust the gland nut. If pressed too tight, the packing and the shaft sleeve friction increases, shorten the service life of the packing and the shaft sleeve, serious when will overheat, smoke, and even burned filler; if the pressure was too loose, in the increase of leakage, decrease the pump power. So the packing should be pressed for elastic, usually in every 30 minutes to 60 water leakage from shaft seal device for appropriate (about pumping of sewage or with a corrosive liquid, can not use the shaft seal equipment). Seal ring is a central concave peripheral projecting ring is provided with a plurality of holes, seal ring sealing pipe alignment. During the operation of water pump, pump high pressure water (or after washing water) passes through the canal into the seal ring seal, the introduction of packing seal, together also cooling, smooth effect.
More varieties of filler, agricultural pumps commonly used oil immersed asbestos packing, it is by impregnated graphite asbestos thread or wire stone cotton knitting and, with wear-resisting, heat-resisting, soft and fine smooth characteristic. In order to ensure that the packing seal has a good working condition, the wear or hardening of the filler, should be replaced in a timely manner. The packing seal has the advantages of simple structure, low cost, convenient assembly and disassembly, short service life and poor sealing performance.
2. Mechanical seal :
Mechanical seal, also known as seal, which is mainly composed of a movable ring (with the pump shaft rotates together), static ring fixed on the pump body), a pressing spring and a sealing rubber ring, etc., wherein. A movable ring bright face by the spring and the water pressure tightly on the static ring bright face and radial sealing together by a sealing rubber ring end axial seal. The utility model has the advantages of compact structure, small mechanical friction and reliable sealing function, but the manufacturing technology of the utility model has the advantages of high requirements. Mechanical seals are widely used for pumping sewage, with corrosive liquid sealing request higher occasions. In some diving electric pump and sprinkler self-priming pump can also be selected
Cable and electric pump device of submersible pump
Equipment and tools required for installation:
1. Reliable lifting equipment (such as a small crane)
2. Apply wrench, hammer, screwdriver, electric tools and megohmmeter, such as clamp current meter.
3. Cable tie line.
Electric pump device:
1. The reverse check valve body of the electric pump is connected with a short water delivery pipe, and the clamping device clamping plate is clamped in the proper orientation of the pipe. Will pump lift gradually into wells, ratio and clamping reliably into Jingtai, loosen hook, the second section tube reliably received first pipe section, fastening screw and remove the first pay plywood, according to the above methods, the pump continues to fall, all piping lifting pipe) installed. Finally, in the appropriate range of the pipe clip plate, firmly fixed on the platform, connected to water pipe (head).
2. Electric pump should be submerged under the dynamic water level, the bottom is not less than 3m from the bottom of the bottom, but not more than 70m. depth of the motor can not be more than the part of the device to touch the sediment. Otherwise, the motor for cooling is not good, will overheat burning.
3. Cable in the downhole device should not be distorted and excessive tension and application of wire the cable with each water pipe (Yang water) on the upper and lower ends of the banding together.
Selection of shield pump in hot water circulating pump
Selection of shield pump in hot water pump
When selecting a shield pump, consider the following factors:
1. Water pump and water contact parts of the material and structure:
The whole process of circulating water in the water pump is in contact with the pump shell, so the material selection of the pump shell has a great influence on the water quality. Currently on the market for the sale of the pump casing pump mainly cast iron, bronze, composite materials, due to cost considerations, most of the air can be used to pump the pump casing. Cast iron prone to oxidation, the formation of metal oxides, which is rust, when the circulating water pump stops, will be able to increase the occurrence of oxides, resulting in two pollution of the circulating hot water. If the excessive intake of the body of this oxide will be a lot of damage, such as damage to the liver. Therefore, the construction of the use of composite pump casing made of the shield pump, it can prevent the pump casing rust caused by the two water pollution problems occur, greatly improve water quality.
2. Pump shaft and bearing to avoid scaling design:
Due to the shielding pump shaft and bearing lubrication is to rely on the transport medium for lubrication, to avoid pump shaft and bearing furring and shaft and bearing structure design of anti scale can appear abnormal important. Have a great influence on the selection of materials before the shaft and the bearing scale problem. It is reported that the majority of manufacturers to adopt is stainless steel as the material of the shaft and the bearing, so easily scaling, the shaft and the bearing are scale easily blocked. On the other hand is the wear performance of stainless steel is not strong, shaft and bearing long run in the future, the gap is more and more big, not only makes void node scale degree aggravating and blocked, and the gap increases after the pump noise and vibration is greatly increased. Some manufacturers of pumps use the ceramic, ceramic and stainless steel compared to more not easy to adsorb scale, together, ceramic with high hardness, good wear resistance between the shaft and the bearing, the stable work of the water pump, low noise, can greatly reduce the scale of, and then to avoid settle scale blocked bad happened.
How to properly use the slurry to improve work efficiency
Select the flow and head according to the actual needs
General users in the slurry pump selection, only pay attention to the flow rate of the pump is selected, regardless of the pump head selection, some people even think that lift the higher insurance, so selection of slurry pump head to greater than the actual lift need and even electric energy wasted a lot of.
Slurry pump selection should be in accordance with the actual need to head to choose, in order to reduce the number of installed, save energy. Also need to pay attention to a point, in the calculation of the lift and need to thinking head loss, prevent the pump head no, and the influence of irrigation and drainage pump power.
The motor and pump power must be matched reasonably
Motor and slurry pump power is not reasonable matching, mainly reflected in "Daniel pulled small plough, the Mavericks pulled large plow" two aspects, especially first phenomenon, in particular, matching the power of selected too large, resulting in electric energy waste is very large. The latter supporting power selected too small, the calf pull plough, stock volume will cause the shortage of slurry pump. Motor overload, or with fixed pump, cannot ensure the equipment safety, economic operation, we must motor and slurry pump power must be matched reasonably, is the solution.
Scientific and reasonable device for slurry pump
If conditions permit, installed the pump to minimize the amount of elbow, or cancel the three valve, pipeline is preferably straight, short, do not and the water outlet pipe is arranged into "flak", take subjacent device, a tilting device and method to reduce the loss. Pipe diameter size of head loss effect greatly, it is best to take the pipe diameter slightly large slurry pump bore a level, can improve the transmission power of the pump.
Slurry pump reasonable selection and use of four or more is, concentrator only reasonable use of these methods, can improve their beneficiation plant production power, achieve the purpose of energy efficiency.
2016年12月5日星期一
Characteristics of hot water submersible pump
Characteristics of hot water submersible pump
Stable operation: absolute concentricity of pump shaft and impeller excellent static and dynamic balance, to ensure the smooth operation, no vibration.
Leak: not the same material of hard alloy sealing, to ensure that the different medium transportation without leakage.
Low noise: two low noise bearings supported by the pump, the work of smooth, in addition to the weak noise of the motor, basically no noise.
Failure rate is low: the layout is simple and reasonable, the key part of the international first-class quality; matching, the whole machine working time is greatly improved.
Repair convenient: replace the seal, bearing, simple and convenient.
An area of more provinces: export can be left, right, up three directions, to facilitate the installation of pipeline layout, saving space
Attention to the use of submersible electric well pumps
1. Check and make sure that the electric water pump rotates in the right direction.
2. After closing, and observe the reading operation noise current meter, to determine whether the normal operation of the electric water pump. If there is abnormal, should immediately stop the inspection.
3. Often detect the operating voltage of the electric pump, after deducting the voltage of the cable, the voltage of the motor winding directly supplied to the motor should be 342-418 volts.
4. The operating current of the electric pump should be checked regularly, and the value of the pump should not exceed the rated current when the pump is running.
5. Ptest the insulation resistance of the motor winding, and its value should not be less than 500 billion ohm when working near the operating temperature.
6. Rand in accordance with the provisions of the protection switch to correct the overcurrent relay or overheating relay action current, so as to avoid the wrong action or loss of overload protection function.
7. Oil filled electric pump if the lack of oil and stop turning, should be timely electric water pump, and timely supplementary insulation oil; when the oil leakage insulation oil more and float to the water, it should be removed, so as to avoid corrosion of the cable.
8. Should not frequently open, stop well submersible electric pump.
Advantages of vertical mixed flow pump
1. Operation simple horizontal pump, because the impeller is above the water, before the pump starts, to use a vacuum pump to pump water, because the vertical pump impeller, generally submerged in water, can be directly launched.
2. Installation area contains the driver, including the vertical pump, only half of the space on the pump to meet the. Especially in the large pump today, this advantage is more outstanding.
3. Is conducive to prevent cavitation vertical pump impeller generally submerged in water, you can use the NPSH can take a large number of. Thus, the pump running at a greater than the planning point of the flow will not attack cavitation.
But because it is a vertical, longitudinal longer pump, disassembling and assembling crane hoisting height is higher, above the pump to have space to meet, this is the disadvantage of the vertical pump. However, the vertical mixed flow pump is simply installed outdoors, so it will not become a question.
How to start and run the high temperature liquid pump
Starting, stopping and running requirements of the high temperature pump :
1. The liquid pump motor is not installed, the power should be turned on to check the direction of rotation must be consistent with the provisions of the pump rotation direction.
2. Liquid pump installed on the motor, the disc dynamic coupling, check the pump shaft and motor is concentric, whether the weight of the rotation is not uniform, and then run the normal.
3. Liquid pump off the outlet pipeline valve and pressure gauge.
4. The liquid pump starting motor, the pressure gauge to open the outlet valve to the required position.
5. The liquid pump normal parking, you should first close the outlet valve, and then stop the motor, close the pressure gauge.
6. Liquid pump bearing chamber should ensure enough oil, bearing temperature rise shall not be higher than 70 .
Selection method of deep well pump
1. According to the dynamic situation. The local well pump supply chains vertical well tube, primary pump. Generally speaking, if the local power supply is guaranteed, the best selection of Submersible pump, because of its light weight, simple to install and use, the verticality of the well pipe requirements is relatively low. Opposite, if the areas without electricity, or power supply to assurance, and verticality of well pipe and relatively good, select diesel engine driven deep well pump.
2. According to the well diameter preliminary determination of the model of the deep well pump. The minimum borehole diameter and the diameter of pump used must conform to, as well as 8 inches diameter, deep well pump should be less than 8JD. But in general, in order to ensure the installation is convenient, the well diameter shall be 2 inches larger than the minimum well diameter of the well pump.
3. According to the maximum water quantity of well selected pump type. The maximum water inflow well in general should be based on the well pumping test to determine. But because of equipment limitations and can not be pumping test, estimated on the basis of well washing water inflow and water level drawdown data.
Structural principles and advantages of deep well pump
Two kinds of pumps are made of three parts. One is well on the part, which comprises a motor, a bearing box and a pump seat, used for supporting power, weight, nitric pump water diversion. Two is in the same transmission part, including the water delivery pipe, transmission shaft and bearing bracket, etc., from the transmission power and compliance. Three is the underground part, including the leaf Han, pump shell, Ye Hanzhou, etc., is the body of the pump, the water absorption, water extraction.
The working principle of the well pump is basically the same as that of the general horizontal centrifugal pump. The power is driven by the driving shaft to drive the pump impeller to rotate, the vacuum is formed at the inlet of the impeller, and the well water is sucked. In order to reduce the energy loss of the water conveyance, the high speed water flow from the blade is eliminated by the flow guiding shell, and then flows along the water pipe to the farmland through the water head.
Deep Well pump has the following advantages:
1. The straw has the advantages of simple structure, the material and process requirements is not high, easy to manufacture.
2. high efficiency.
3. The engine installed in the wells, convenient installation.
4. Leaves immersed in water, do not need to water before starting.
5. The price is cheap.
Improper selection of fountain pump and operation error
The following experts gave some of the fountain pump to solve the corresponding problems of the proposed solution:
1. Two pumps in parallel shall ensure that the pump performance is the same. Pump performance curve should be slow down for good, can not have a hump.
2. Ushould pay attention to: lead to the elimination of fountain pump overload factors, such as clogging; appropriate to extend the pump opening time, reduce the disturbance of the drive shaft, rotary impact and friction between parts and stationary parts is decreased, and the resulting thermal deformation; for water lubricated sliding bearing, start process should be full of pre moistened water skiing, avoid dry start, until the water pump to stop pouring.
3. Regular to the needs of the amount of oil bearing oiling, for axis liquid centrifugal pump, because the shaft have a torsional vibration, if used with thrust, damage is mainly thrust, then can be an appropriate increase in the lubricating oil viscosity, prevent liquid dynamic pressure lubricating film damage.
4. The fountain pump is recommended in order to prevent the fountain pump is too large, you can also use the measurement and analysis of vibration conditions to determine the best working parameters of the pump
Installation and installation work order of submersible axial flow pump
Preparation before installation ：
1. Measuring and checking the installation position of the axial flow pump in the construction site and measuring the discharge line to determine the installation coordinate of axial flow pump and shaft axis reference line.
2. Inspection and acceptance, the quality inspection of the appearance of the axial flow pump and the shaft parts, and random data should be complete.
3. Artificial crane, truck after unpacking inspection of axial flow pump, shaft parts and transport to the construction site.
Installation and installation work order of submersible axial flow pump
Shaft installation:
1.According to the equipment on the line of the reference point, the first installation of the fixed bearing.
2.With the manual lifting machine will be in place, if the shaft is longer, in the lifting process should avoid collision with other objects in the wellbore and cause damage to the shaft.
3.Shaft lifting, the shaft is fixed, the righting leveling, ensure the wellbore verticality is less than 1/1000, length of not more than 3mm (with wire and straightedge check).
Axial flow pump installation:
1.The shaft installation is fixed, and after the adjustment of the adjustment of the allowable deviation value, the axial flow pump installation work.
2.With the manual lifting machine to lift the axial flow pump to the shaft mouth, and then the axial flow pump down the shaft slowly down to the bottom of the shaft bearing, the axial flow pump to the leveling, and then tighten the fixed bolt.
3.Deviation and test method for installation of axial flow pump.
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