What are the considerations when assembling a gear pump?

26. What should be paid attention to during assembly?

Answer: 1) Whether the pump shaft is bent or deformed;

2) Whether the rotor balance meets the standard;

3) Clearance between impeller and oil pump housing;

4) Whether the compression amount of buffer compensation mechanism of mechanical seal meets the requirements;

5) concentricity of pump rotor and volute;

6) Whether the center line of the pump impeller passage and the center line of the volute passage are aligned;

7) Clearance adjustment between bearing and end cover;

8) Clearance adjustment of the sealing part;

9) Whether the assembly of the motor of the transmission system and the speed changer (increase and decrease) meets the standards;

10) alignment of the coaxiality of the coupling;

11) Whether the gap of the mouth ring meets the standard;

12) Whether the tightening force of connecting bolts of each part is appropriate.

 

27. What is the purpose of pump maintenance?

What are the requirements of Botou Oil Pump Plant?

Answer: purpose: through the maintenance of the machine pump, eliminate the problems that exist after long-term operation.

The requirements are as follows: 1) Eliminate and adjust the large gap caused by wear and corrosion in the pump;

2) Eliminate dirt, dirt and rust in the pump;

3) Repair or replace parts that do not meet the requirements or are defective;

4) The rotor balance test is qualified;

5) Check the coaxiality of the pump and the driving machine and meet the standard;

6) Qualified test run, complete data, to meet the requirements of production process.

 

28. What is the reason for the excessive power consumption of the pump?

Answer: 1) the total head does not match the head of the gear oil pump;

2) The density and viscosity of the medium are inconsistent with the original design;

3) The pump shaft is inconsistent with or bent with the prime mover axis;

4) There is friction between the rotating part and the fixed part;

5) Wear of impeller mouth ring;

6) Improper installation of seal or mechanical seal.

 

29. What are the causes of rotor imbalance?

A: 1) error in manufacturing: uneven material density, not coaxiality, not roundness, uneven heat treatment;

2) Incorrect assembly: the center line of the assembly part is not coaxial with the axis;

3) Rotor deformation: uneven wear, shaft deformation in operation and temperature.

 

30. What is a dynamic unbalance rotor?

A: there are rotors with equal magnitude, opposite directions, unbalanced particles combined into two couples that are not on a straight line of the day.