Because the wearing parts of screw pump have a certain life, after
long-term operation, the wearing parts will be worn and have abnormal faults, so
it is necessary to replace new accessories, such as screw pump stator, rubber
ball, screw shaft and other accessories. Screw pump is a positive displacement
rotor pump, which depends on the volume change of sealing cavity formed by screw
and bushing to inhale and discharge liquid. Screw pump is divided into single
screw pump, double screw pump, three screw pump and five screw pump according to
the number of screw. So what are the common problems of single screw pump? What
are the maintenance methods of screw pump? Let's take you to know:
Common
problems and maintenance methods of single screw pump
1. Causes of severe
vibration or noise of pump body
Screw pump installation is not firm, pump
installation is too high, more than the pump suction capacity; The motor ball
bearing is damaged; The main shaft of water pump is bent or not concentric or
parallel with the main shaft of motor; Air leakage at suction pipe or pump
suction end; The suction line is blocked. The solution is to install the pump
stably or reduce the installation height of the pump, reduce the resistance of
the suction pipeline, clean or increase the filter, and reduce the viscosity of
the medium; Replace the motor ball bearing; Correct the bent pump spindle or
adjust the relative position between the pump and the motor; Eliminate air
leakage of suction pipe and pump suction end; Remove the blockage of the suction
pipe.
2. Causes of overheating of drive shaft or motor bearing:
Lack of
lubricating oil or bearing rupture, etc. The solution is to add lubricating oil
or replace the bearing.
3. Screw pump heating:
Serious friction of
rotating parts in the pump; The oil return hole of mechanical seal is blocked;
The oil temperature is too high; The installation is not correct and the
rotating parts are not concentric. The solution is to check and replace the worn
parts; Dredge the oil return hole; Reduce the oil temperature properly; Adjust
and correct assembly and installation accuracy.
4. No flow output:
The
suction pipe is blocked or leaking; The suction height exceeds the allowable
suction vacuum height; The motor reverses; It is caused by high viscosity of
medium. The solution is to check the suction pipeline, reduce the suction
height, change the motor steering, heat the medium and so on.
5. Insufficient
pump pressure:
Whether the seal leaks; In the state of equipment stop, when
the screw pump has self closing function, check the water supply; Whether the
model selection is correct; There's too much pressure at the exit. Wait. The
pressure of the pump is insufficient. There are many problems involved. The
simple thing is to check whether the inlet is blocked. I'm looking at the motor.
If these two are OK, I have to open it down to see if the screw and bearing are
broken
6. Flow decrease:
The suction pipe is blocked or leaking; The
spiral sleeve and bushing are worn; The spring of safety valve is too loose or
the contact between valve disc and valve seat is not tight; The motor speed is
not enough; Installation too high, more than the pumping capacity, shaft seal
leakage. The corresponding solution should be to repair the suction pipeline;
When the wear is serious, the parts should be replaced; Adjust spring, grind
disc and seat; Repair or replace the motor; Reduce the suction height and
suction pipe resistance; Repair or replace the shaft seal.
7. Large amount of
oil leakage of mechanical seal:
The assembly position is not right; The gland
is not flattened; The sealing surface of moving ring or stationary ring is
damaged; The dynamic ring or static ring seal is damaged. The solution is to re
install as required; Adjust the gland; Grind the sealing surface or replace it
with a new one; Replace the sealing ring.
8. Mechanical seal heating:
The
sealing fluid pipeline is blocked; The compression of mechanical seal spring is
too large. The solution is to eliminate the sealing pipeline fault; Reduce the
amount of spring compression.
9. The shaft power increases sharply
The
discharge pipeline is blocked; Serious friction between screw and pump sleeve;
The viscosity of medium is too high; The installation is not correct and the
rotating parts are not concentric. The solution is to stop the pump and clean
the pipeline; Repair or replace relevant parts; Raise the temperature of the
medium to reduce the viscosity; Adjust and correct assembly and installation
accuracy.
10. Holding shaft (unable to rotate)
The temperature is too high
and the parts in the pump expand excessively; Insufficient starting torque. The
solution is to start the pump after cooling by hand; Check the drive.
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