Vane pump troubleshooting

In the leaf pump product manual, there are generally detailed installation instructions and precautions. However, in actual use, faults and problems often occur or occur. The vast majority of these problems are due to improper use. The proportion of improper use of oil pumps accounts for more than 95% of the damage. What actually belongs to product quality problems is Very little. In order to distinguish what kind of problem it is, to use it correctly and determine the cause of the fault, we hereby provide the following experience for reference:

First, the use of improper performance:

1, the wrong installation method:

a. The coupling is too tight: As the clearance between the coupling and the shaft is too small or there is no clearance, the bearing will be injured when it is struck hard, which will lead to early damage of the bearing and affect the life of the entire pump core.

b. Axial force of the shaft head: Due to the lack of a certain axial clearance when the coupling is installed, the hardware installation will damage the bearing and the bearing retaining ring, which will injure the entire pump core.

c. Concentricity excess: If the coaxiality exceeds the specified value during installation, the bearing and the entire pump core will be decentered and damaged early. Generally, the control is better than ≤ 0.1 mm.

2. Bad system environment a. Oil is dirty: As the mailbox is not sealed, dust and iron mixed in the surrounding oil can cause early damage to the pump.

b. Temperature is too high: As the cooling device is not installed, the oil temperature will continue to increase during the continuous use of the machine. If the oil temperature is above 70 degrees for a long time, the life of the oil pump will be greatly shortened, and generally it will be damaged (sometimes shorter) in six months to a year.

c. Into the oil: In the device with water cooling, due to the poor sealing of the water pipe, the water enters into the oil, causing the parts of the pump core to rust, lock up, and the blade cannot be thrown.

3, the error generated when rotating the direction of the oil port:

a. The pump core Xiaozi did not go to Xiao Kong Li (or pull it out when rotating), this is the space of the oil suction port of the oil pump is reduced, and the oil sucks the oil and the oil is blocked. The performance is: the noise is large, the pressure swings, and the oil will be used for a long time. If the temperature rises too quickly, the life of the stator will be shortened when the curve hits a ripple.

b. If the rotating ring is trimmed or the screws are not evenly tightened, oil leakage may occur.

Second, the determination of common fault phenomena:

1. Research pump (burnt plate): Reason: The oil is too dirty and improperly installed. The oil enters into the water and there are iron filings in the oil (new machine market occurs). High oil temperature or parts manufacturing accuracy is not enough.

3. Noisy: When it is especially large, a. The air inlet leaks. (O-ring seal failure, screw too long or flange too thin)

b. The filter is clogged and the flow of oil is insufficient.

c. The viscosity of the oil is too high. (The weather is too cold or the brand is wrong)

d. Assembly error. (When changing the position of the inlet and outlet, the method and method are not proper or the sealing ring is not installed and the positioning of the pump core is not inserted into the empty space of the back cover, etc.).

When relatively large a. The above situation exists evenly.

b. The product quality is not good.

3, the system has no pressure:

a. Overflow valve failure. (need to clean or replace)

b. Pressure relief valve failure. (need to clean or replace)

4. When the inner curve of the stator is a corrugated plate-like ripple: it is caused by poor oil absorption. The phenomenon is that the pressure is unstable, the pressure is too low, the noise is high, there are obvious metal knocking sounds, and the compressed air is compressed after inhaling air. The resulting crashes are due to the following reasons:

a. The oil is too sticky to absorb enough oil.

b. The suction filter is clogged or too small and the area for oil absorption is insufficient.

c. The oil level is too low and the oil is not in place.

4. If the system exceeds the rated pressure, the following conditions will occur:

a. The shell is broken.

b. Stator fracture.

c. Shaft fracture.

d. The screw is broken.

e. Shortened life expectancy.

Cause: The oil in the mailbox is dirty or the overflow valve and other function valves are stuck after entering the iron filings. This will cause the pressure to increase indefinitely. If the “safety protection” design of the system is unreasonable or the “safety factor” is too low, it will cause instantaneous pressure to exceed the standard. When the system pressure exceeds the rated standard, the internal parts of the pump core cannot withstand the high pressure and thus cause The fracture or life of a part is rapidly shortened. Check the pressure method: Connect the pressure gauge at the inlet and outlet of the oil pump and observe the pressure under normal conditions.

Third, the oil pump serious damage after the technical appraisal: After the oil pump damage, first of all to check the appearance, internal and related phenomena. When the following phenomena occur, its corresponding causes can be determined:

1, bearing damage: When the pump damage is more serious damage, which as long as the bearing is damaged, are regarded as caused by improper installation. (Because the bearing is damaged earlier, when the bearing is damaged, the shaft will swing, telling that the swing will not cause damage to other parts)

2, the liner embroidered: When the pump core damage a number of serious damage, as long as there is rust. Always considered as a result of water in the fluid. (Because the oil is normal, there will never be rust)

3, poor oil quality: When the pump core is seriously damaged. As long as there are stolen goods, foreign objects or oil in the oil has turned black, they are all regarded as dirty and poor oil quality.

4, the new shaft fracture: should try to check the location of the fracture, if it is a material or heat treatment is not good, its damage point should be the weakest link, that is, the smallest diameter or flower health, if not the weakest point should be considered to install the fracture Improper, caused by too much deviation of coaxiality.

5, in the inspection of materials, the composition of the material, metallographic structure, hardness, etc. should be checked, but also to analyze the order of sequence and causality of damaged parts, and finally to find out the reasons.

Fourth, the following are the quality issues in product manufacturing:

1, high noise: As long as other reasons are excluded, it should be a quality problem.

2. Scratching of parts: The scratches on the side plates are symmetrical, and the phenomenon of diagonal scratches should be a quality problem.

3, shaft fracture: When broken in the weakest place, while other parts are intact when the quality of the shaft.

4, rotor fracture: other parts are not broken, only the rotor is broken, is a quality problem.

5, blade fracture: other parts are not broken, only the blade is broken, is a quality problem.