How to install a stainless steel self-priming centrifugal pump?
The stainless steel self-priming centrifugal pump adopts the pump body structure of axial return fluid. Pump body is composed of suction chamber, liquid storage chamber, coil vortex chamber, the liquid hole, and other components of the gas-liquid separation chamber, pump after the normal starting, the impeller of the suction chamber liquid and inlet line of air inhaled together, and can completely mixed within the impeller, in the role of the centrifugal force, the liquid with gas to the vortex flow volume outside edge, has a certain thickness is formed on the outer edge of the impeller of the white foam belt and high-speed rotating liquid ring. The gas-liquid mixture enters the gas-liquid separation chamber through the diffusion tube. At this point, due to the sudden decrease of flow velocity, the lighter gas is separated from the mixture, and the gas continues to rise through the pump body. After degassing of liquid to liquid storage chamber, and the reflux hole again into the impeller, and impeller with inhalation of gases from the inlet line again mix, flow under the action of the high-speed rotating impeller and the impeller outer edge... . As the process goes on and on, the air in the inhalation line decreases until it exhausts the gas, completing the self-priming process, and the pump goes into normal operation.
There is also a cooling chamber at the bottom of the bearing body of some pumps. When the bearing temperature rises to more than 70 degrees, the cooling fluid can be injected into the cooling chamber at the cooling chamber. Inside the pump to prevent the liquid from high to low pressure area before and after the leakage of sealing mechanism is sealing ring, sealing ring before loading on the pump body, the ring is installed on the bearing body, when the pump after long-term operation sealing ring wear, and affect the efficiency of the pump and self-priming performance, should be given replacement.
Stainless steel self-priming centrifugal pump installation.
1. When the pump is connected with the motor, it should pay attention to the coaxiality of the pump shaft and motor output; The accuracy of pump installation has a great influence on the operation stability and service life of the pump, so it must be carefully and carefully installed and corrected.
2. The pump coupling must be firmly fastened with nuts, and the nut should be locked, and the nut should be loose, otherwise it will cause the impeller to move and cause mechanical failure.
3. In order to maintain a certain amount of storage fluid in the pump to achieve better self-absorption capacity and prevent mechanical seal dry friction, the pump must be imported higher than the center line of the pump shaft.
4. Installation of suction pipe shall be noted:
A, suction installation height can't more than 5 meters, when conditions permit, suction installation height should be as far as possible below the lowest water pool plane, and try to shorten the length of the suction pipe, short-ship elbow, it is beneficial to shorten the self-priming time, improve the function of self-priming.
B. The valve and flanges in the suction pipeline should be strictly leakproof or leaky, that is, there is no leakage in the suction line.
C. The body should be prevented from inhaling solid and other sundries, so the filter should be set up on the suction pipe. The effective water area of the filter should be 2-3 times of the suction pipe section, and the filter should be checked regularly.
D, the suction pipe and the discharge pipe shall have their own support, and the pump body shall not be allowed to bear the load of the pipe.
5. When the pump is installed, the electrostatic grounding resistance of the pump and the pipeline should meet its requirements.
6. When installing, check the shell and pipeline for stones, iron sand and other sundries.
7. Adjust the installation clearance and coaxiality of the coupling of the pump coupling and the electric motor coupler, and the deviation of non-coaxiality is 0.1mm. The height of the pump shaft and motor shaft can be adjusted on the bottom foot with copper or iron.
8. After the actual operation of the unit for 3-4 hours, the final inspection shall be made. If there is no undesirable phenomenon, the main installation is completed and the shaft should be checked in the test operation.
9. The pump bearing body has a cooling water joint with cooling chamber device for the use of a rubber tube or plastic pipe with an inner hole of 12, and its thread size is m12x1.75.
10. If the pump is equipped with a one-way valve on the outlet pipe of the pump, it should be added to the outlet of the pump and the valve at the outlet of the pump when the pump is unable to discharge the gas smoothly.
The use of stainless steel self-priming centrifugal pump.
First, the preparation before starting has inspection work.
1, this series self-priming pump, according to the running status of pump, with high quality calcium base 10 butter and oil for lubrication, if use butter lubrication pump filling in the butter should be regularly to bearing, lubrication oil pump, if the oil level is insufficient, the foot.
2, check the reservoir fluid in the pump shell is higher than that of the upper edge of the impeller, if less than, can from the pump casing and liquid inlet reservoir is put directly to the note in the pump body, should not be in the case of insufficient reservoir started running, otherwise can't work normally, and easy to damage the mechanical seal.
3. Check whether the rotating parts of the pump have the jamming phenomenon.
Stainless steel self-priming pump.
Stainless steel self-priming pump (3 pieces)
4. Check whether there is any looseness of the nut at the foot of the pump body and all the joints.
Check the coaxiality of the pump shaft and motor spindle.
6. Check whether the inlet pipeline is leaking, and if there is a leak, we must try to eliminate it.
7. Open the valve of the suction line and slightly open (not fully open) the outlet control valve.
Ii. Starting and operation.
1. Point the self-priming pump, and pay attention to whether the steering of the pump shaft is correct.
2. Notice the normal sound and vibration of rotation.
3, pay attention to the pressure gauge and vacuum meter readings, starting when the pressure gauge and vacuum gauge after reading instruction due to the variation of stable over a period of time, after that the pump has been on the inside liquid, into the normal infusion operation.
4. During the self-priming process before the pump enters the normal infusion operation, special attention should be paid to the increase of water temperature in the pump. If the process is too long, the water temperature in the pump is too high, then the pump is stopped to check the cause.
5, if caused by the high temperature of the liquid in the pump self-priming difficulties, you can temporarily stop, using the out line of the liquid flow back to pump or pump body upon the reservoir fluid in the mouth place directly to the pump, cooling the liquid in the pump, then starting.
6. In the process of the pump, if there is a strong vibration and noise, it may be caused by cavitation of the pump. There are two reasons for the cavitation: one is that the flow rate of the inlet pipe is too large, and the other is that the suction is too high. When the flow rate is too large, it can adjust the outlet control valve, raise the pressure gauge reading, and should be eliminated in time when the inlet line is blocked; When the suction is too high, the installation height of the pump can be reduced properly.
7, pump in the process of work for pump stopped, when to start again, export control valve should be slightly open (not all) closed, both is advantageous to the self-priming process gas from the outlet vomit, and can guarantee the tip under the lighter is responsible for the launch.
8. Check whether there is leakage in the piping system.
Third, stop the pump
1. First, you must close the gate valve on the road.
2. Stop the pump from turning.
3. During the cold season, the water in the liquid and bearing body of the slurry pump should be emptied to prevent frostbite.
Maintenance and disassembly
Stainless steel self-priming centrifugal pump is characterized by simple structure and durability. Under normal pump conditions, it is not necessary to open and maintain frequently. When the fault is found, it can be removed at any time.
1. When maintaining the pump, pay attention to several main parts:
A. Rolling bearing: when the bearing is worn to A certain extent after long running, the bearing shall be replaced.
B, front sealing ring and rear sealing ring: when the sealing ring is worn to a certain extent, it must be replaced.
C. Mechanical seal: mechanical seal should not be opened for inspection without leakage of liquid. If there is a serious leakage at the lower end of the bearing body, the mechanical seal should be removed. When assembling and dismantling mechanical seal, it is necessary to take light and light, pay attention to the cleaning of the mating surface, protect the mirror of the static ring and the moving ring, and forbid the percussion. The cause of leakage due to mechanical seal is mainly the friction side mirror. The method of repair: the friction pair can be ground to restore the mirror. Another reason for the leakage of mechanical seal products is the improper installation of o-ring or the aging process. At this point, the o-ring should be replaced to reassemble.
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