Viking VIKING gear pump It is a reverse pump that transports liquid or pressurizes it by changing and moving the working volume formed between the pump cylinder and the meshing gear. Two enclosed spaces are composed of two gears, pump body and front and rear covers. When the gear rotates, the volume of the space on the side where the gear is disengaged increases from small to large, forming a vacuum. The liquid is sucked in. The volume of the space on the meshing side of the gear decreases from large to small, and the liquid is squeezed into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of two gears. Gear pump The pressure * at the discharge port of depends on the resistance at the pump outlet.

VIKING VIKING gear pump Maintenance steps of

1、 Disassemble

Before disassembly, sufficient preparations shall be made to understand the equipment structure, process flow and operation status; Take care when disassembling to avoid damaging equipment parts.

2、 Review data

Yes VIKING gear pump The fitting clearance of all parts shall be checked comprehensively. See Table 1-1 for the standards of some clearances.

3、 View

Check the removed parts in detail, and check the gears for coloring. No cracks are allowed; The conicity of the journal is qualified, and the surface is free of scratches. The maximum allowable roughness Ra is 1.6 μ m； The end cover, bracket and pump body shall have no obvious defects.

4、 Correction or replacement

The spare parts that exceed the expenses shall be replaced, and the spare parts that need to be corrected shall meet the standards after correction.

5、 Assembly and adjustment

The axial clearance between the gear end face and the end cover, the bracket, is adjusted by changing the thickness of the seal gasket between the end cover, the bracket and the pump body; When tightening the end cover bolts, the force shall be symmetrical and uniform, and the rotor shall be turned while tightening. When the rotor cannot rotate, the bolts shall be loosened and tightened again; When adding packing or installing oil seal, it is still necessary to rotate the rotor while tightening the gland. Do not tighten it too tightly.

6、 Commissioning

The hydrostatic test is 1.5 times of the operating pressure, and no leakage is allowed for 5min. During the test run, if there is no leakage, the running sound is normal, and there is no abnormal oscillation, and the outlet pressure meets the requirements, it is qualified.

Common sense of Viking Pump gear pump repair

Vikingp VIKING gear pump With the improvement of repair knowledge, the gear pump will show some shortcomings such as lack of pump oil, or even no oil. The main reason is that the relevant parts are excessively worn. The wearing parts of the gear pump mainly include the driving shaft and bushing, the middle hole and shaft pin of the driven gear, the pump casing cavity and gear, the gear end face and the pump cover. When the primary skill policy of the lubricating oil pump fails to meet the requirements after wear, it shall be disassembled and differentiated, the wear position and level shall be checked, and the corresponding methods shall be accepted for correction.

1、 Correction gear pump after the driving shaft and bushing are worn. After the driving shaft and bushing are worn, their clearance increases, which will definitely affect the oil volume of the pump. The normal clearance can be recovered by repairing the driving shaft or bushing. If the driving shaft is slightly worn, just press out the old bushing and replace it with a standard size bushing, and the clearance together will recover to the allowable limit. If the driving shaft and bushing are severely worn and the gap between them is severely overspent, it is not only necessary to convert the bushing, but also to enlarge the diameter of the driving shaft by chrome plating or oscillatory surfacing, and then grind it to the standard size to recover the requirements with the bushing.

2、 Repair of lubricating oil pump housing Repair of shell crack:

The shell crack can be repaired by welding with 508 cast nickel copper electrode. The weld must be tight and free of pores, and the flatness error of the connecting surface with the pump cover shall not be greater than 0.05 mm. Repair of wear of driving shaft bushing hole and driven shaft hole: After the driving shaft bushing hole is worn, reaming method can be used to eliminate the wear traces, and then the bushing with corresponding size shall be used. The driven shaft hole wear is also eliminated by reaming, and then the repair of the driven shaft pump casing inner cavity is made according to the practical dimension of the reamed hole: after the pump casing inner cavity is worn, the inner cavity inlay method is generally accepted for correction, and the single precipitator is equipped with cast iron or steel bushing after the inner cavity is expanded. After the bushing is inserted, the inner cavity shall be lined to the required dimension, and the bushing protruding from the end face shall be polished to make it flush with the connecting surface of the pump casing. Repair of valve seat: there are two types of pressure limiting valve: ball valve and plunger valve. After the ball valve seat is worn, a steel ball can be placed on the valve seat, and then the steel ball can be knocked quietly with a metal rod until the ball valve and the valve seat close together. If the valve seat is severely worn, it can be reamed to remove the wear mark, and then the upper method can be used to make it close. After the plunger valve seat is worn, a small amount of valve sand can be put in for grinding until the sealing stops.

3、 Repair of pump cover Repair of mission plane:

If the wear on the mission plane of the pump cover is small, the abrasion vestige can be eliminated by craft grinding method, that is, put a small amount of valve sand on the channel or thick glass plate, and then put the pump cover on it for grinding until the abrasion vestige is eliminated and the mission surface is flat. When the wear depth of the mission plane of the pump cover exceeds 0.1mm, it shall be corrected by turning first and then grinding. Repair of dust remover bag cage driving shaft bushing hole: repair of driving shaft bushing hole wear on the pump cover is the same as repair of housing driving shaft bushing hole wear. 4、 The gear wear of gear pump is mainly in the tooth thickness, while the wear of gear end face and tooth top is relatively light. The gear is worn unilaterally at the tooth thickness, so the gear can be turned 180 degrees for use. When the end face of the gear is worn, the end face can be ground flat, and the connecting surface of the lubricating oil pump housing can also be ground to ensure that the gap between the end face of the gear and the pump cover is within the standard limits.

Viking VIKING gear pump Routine maintenance method

When we use the gear pump, we can't avoid the wear of the gear pump, so there will be many problems, so we need to learn a universal repair skill for the gear pump. If there is a problem, we can make an accurate judgment. Next, I will talk about the general repair skills:

1. Repair of the operation plane: if the wear of the operation plane of the pump cover is relatively small, you can remove the wear marks by hand grinding, that is, put a small amount of valve sand on the channel or thick glass plate, and then put the pump cover on it for grinding until the wear marks are removed and the operation surface is flat. If the wear depth of the pump cover operation plane exceeds 0.1 mm, it shall be repaired by turning and grinding first.

2. Repair of driving shaft bushing hole: the repair of driving shaft bushing hole wear on the pump cover is the same as that of housing driving shaft bushing hole wear.

Repair of pump casing inner cavity: after the pump casing inner cavity is worn, the inner cavity inlay method is adopted for correction, that is, cast iron or steel bushing is inlaid after the inner cavity is large. After inserting the sleeve, the inner cavity shall be lined up to the required dimension, and the sleeve protruding from the end face shall be polished to be flush with the joint surface of the pump housing.

3. Repair of valve seat:

There are two kinds of pressure limiting valves: ball valve and plunger valve. After the ball valve seat is worn, put a steel ball on the valve seat, and then knock the steel ball with a metal rod quietly until the ball valve and the valve seat close together. If the valve seat is severely worn, it is necessary to ream to remove the wear mark, and then use the above method to make it close. After the plunger valve seat is worn, a small amount of valve sand can be put in for grinding until the sealing stops.

The above is about the repair of some parts of the gear pump foundation. We may encounter different problems in other aspects in the process of use. We also need to carefully discuss these different problems to find out the causes of these problems.