一、 概 述
The CFZ type pump is marine horizontal self-priming sewage pump ,which is used to crush the raw sewage in the ship sewage treatment plant. Water temperature to be room temperature, the pump flow parts are made of bronze pieces or stainless steel materials. This pump can also be used to transport water.
This pump is centrifugal pump with the knife. Crush knife installed in the pump body and impeller edged blade into the crush blade unit. Sewage residue after shear knife, and recycled many times, was crushed into fine particles of sludge residue. Pump shaft seals use mechanical seal, pump top and bottom, respectively,equipped with water injection plug and the drain plug.
Stureture drawing of the pump:
Ⅲ、Assembly and disassembly
1.Put spacer and seal ring in the relevant part；
2.Put the seal ring, static knife into the pump body；
3.The shaft sleeve fitted on the motor shaft, and then the bracket is connected to the motor, tighten the nuts;
4.Pump cover fitted on the pump shaft, impeller fitted, mechanical seal fitted ，tighten the impeller nuts;
5.Pump and bracket to be connected, tighten the nuts;
6.Fitting the suction connector and the discharge connector, tighten the nuts;
7.Finally, the pump and motor are mounted on a common base.
The disassembly order is contrary to the assembly order.
The installation of pump could affect the running and service life of pump. Therefore, it is necessary to be careful during installation and adjustment.
1. Inspect the motor and pump to check if there is any failure and inspect the main dimension,prepare tools.
2. Install pump on the installation base, and loosen the bolt.
3. The pump inlet must have a removable short pipe (approximately 200mm) in order to eliminate the obstruction of the suction.
4. Make sure that the weight and flexible force of pipe do not act on pump directly while installing pipe.
Ⅴ.Service and Maintenance
Requirements of service
1.Turn the pump axle to make sure there is no block or friction of rotor before starting the pump.
2.Check whether the connection between pump and pipe is loosened or not.
3.Check valve should be installed in the bottom of suction pipe of pump to make sure operation is prompt.
4.Before starting,you must open the pump body top thread plug or air-release valve.Then pour water into the pump body.After water is emitted,you must screw the thread plug or close the air-release valve.
5.Skimming the motor,check to see if the direction of rotation is correct. Fully open the suction valve and start the motor after the rotation to be determined consistent. Adjusting the discharge valve to the required outlet pressure after the pump outlet pressure rising gradually.
6.Discharge valve should be closed after cutting off the electric motor. Cut off power first, then close discharge if the electricity is cut off suddenly during the running.
7.Pump should run in the recommendatory allowable flow range. General speaking, the range is 50%~120% rating flow.
8.Do not let pump run for long in the circumstance of discharge valve closed.
1.Check the sealing of non-return valve of pump in the suction pipe regularly.The check valve leaks,so that the pump isn’t full of water and the exit pressure isn’t existent were this to happen,you must stop running to avoid the pump is damaged on account of idling.
2.Stop the pump to check if there is any abnormity noise or vibration during operation.
3.Release discharge bolt to discharge the retained water if the pump will not be used for long.
4.Mechanical sealing should be inspected once half a year. Replace them if necessary to make sure discharge is less than 10 ml/h.
解 决 方 法
Ⅵ.Reason of Normal Failure and Solution
1.Pump could not suction water. The fingers of pressure gauge and vacuum gauge swing acutely.
The filled water is insufficiency. There is leakage in water pipe or instrument.
Fill water to the pump or screw the leakage.
2.The pump could not suction water. And the vacuum gauge shows highly vacuum condition.
The bottom valve isn’t open or is stagnated. The resistance of suction pump is too large. The diameter of suction is too large.
Check or replace the bottom valve. Clean or adjust suction pipe. Lower the suction water position.
3. The pressure gauge shows pressure in the outlet, however, there is no water.
Resistance in the outlet pipe is too large. The rotation direction is wrong. The impeller is stagnated.
Check the outlet pipe or short the length. And check the running direction of electric motor. Clean the impeller.
4.The capacity is less than the specified value.
The pump is stagnated. The sealing ring wears too much.
Clean the pump and pipe. Replace the sealing ring.
5.The actual power of pump is too high.
The pump axial and electric motor axial are not in the same line. Impeller is worn too much.
Adjust the axial line of pump and electric motor. Replace pump axial. Replace impeller.
6.Abnormal noise in the pump. Pump could not suction water.
The capacity is too large. Resistance in the suction pipe is too large. The suction pipe position is too high. There is leakage in the suction place. The temperature of transported media is too high.
Add the resistance in the outlet to lower the capacity. Check the resistance in the suction pipe of pump. Check the bottom valve and lower the high of suction position. Screw the leakage. Lower the temperature of liquid.