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First, improper use of several performance:
1, the wrong installation method:
a, the coupling is too tight: Since the coupling with the shaft with the gap is too small or no gap, the force percussion, the bearing will be injured, leading to early bearing damage and affect the life of the pump.
b, Axial axial force: As the coupling is not installed in the axial clearance, the hardware installation will make the bearing and bearing ring damage, will seriously damage the entire pump core.
c, coaxial error: If the installation of concentricity exceeds the specified value, the bearing and the entire pump eccentric and early damage, the general control of ≤ 0.1 mm or so as well.
2, bad system environment a, oil is dirty: Because the mailbox is not sealed, the surrounding dust and iron mixed with oil can make early damage to the pump.
b, the temperature is too high: the cooling device is not installed, the continuous use of the machine, the oil temperature will continue to rise. If the oil temperature is higher than 70 degrees for a long time, the life of the pump will be greatly shortened, generally it will be damaged (sometimes shorter) in six months to one year.
c, oil in water: In a water-cooled device, due to poor water seal, resulting in water into the oil, the pump parts rusty, lock, leaves thrown out and so on.
3, the direction of the rotation port error:
a, pump Xiao Zi did not go in Xiao Kong Li (or pull out caused by rotation), which is the pump suction port space reduced, oil absorption resistance poor absorption, manifested as: noise, pressure swing, prolonged use will make the oil Temperature rise too fast, the curve of the stator into a corrugated life shortened.
b, rotating the seal trimming or screw fastening uneven oil leakage phenomenon.
Second, the common phenomenon of failure to determine:
1, research pump (burn disk): Reason: dirty oil, improper installation, the oil into the water, iron in the iron (new machine market). High oil temperature or component manufacturing accuracy is not enough.
3, noisy: especially large a. Inlet leakage. (O-ring seals failed, screws too long or flange too thin)
b. clogged filter, into the oil flow is not enough.
c. The viscosity of the oil is too high. (The weather is too cold or wrong grade)
d. assembly error. (When changing the location of the import and export direction of the method and the essentials is not properly or the seal is not installed and the pump positioning Shaw not inserted into the back cover of the air to go).
Larger a. The above situation is uniform.
b. product quality is not good.
3, no pressure system:
a. Pressure relief valve failed. (To be cleaned or replaced)
b. Pressure regulator failure. (To be cleaned or replaced)
4, the stator curve was wash plate corrugated: a result of poor suction, the phenomenon is unstable pressure, the pressure is too low, the noise is high, there is a clear metal percussion, and as inhaled air is compressed The resulting crack crackling, for the following reasons:
a. The fluid is too viscous to absorb oil.
b. Suction filter clogged or too small, oil absorption area is not enough.
c. The oil level is too low, the oil is not in place.
4, the system if the pressure exceeds the rated standard will appear the following conditions:
a. The shell is broken.
b. Stator breakage.
c. Shaft rupture.
d. The screw is broken.
e. Shortened life span.
Reasons: Mailbox oil dirty or into the iron after the overflow valve and other functional valve stuck. Will lead to unlimited pressure increase, if the system's "safety protection" design is not reasonable or "safety factor" too low will also lead to instantaneous pressure over the system pressure exceeds the rated standard, the internal components of the pump can not withstand high pressure resulting A part of the rapid decline in the fracture or life expectancy. Check the pressure method: In the pump inlet and outlet port connected pressure gauge, observe the pressure conditions under normal conditions.
Third, the pump after serious damage to the technical appraisal: pump damage, we must first check the appearance, internal and related phenomena. When the following phenomena occur, its corresponding reason can be determined:
1, bearing damage: When the pump more serious damage to damage, as long as there is damage to the bearings, will be regarded as improper installation. (Because the bearing damage in the first, when the bearing is damaged, the shaft appears to swing, tell the swing will not cause damage to other pieces)
2, there are embroidered liner: When the pump damage to many serious damage, of which as long as there is rust. Will be regarded as caused by water in the oil. (Because the oil is normal, there will be no rust situation)
3, bad oil quality: when the pump is seriously damaged. As long as there is stolen oil in the oil, foreign matter or oil has become black, will be treated as dirty oil, caused by poor oil quality.
4, the new shaft rupture: should try to check the location of the fracture, if it is material or heat treatment is not good, its damage point should be the weakest link, that is, at the minimum diameter or Hua Jian Department, if not in the weakest point of fracture should be considered as installation Improper, coaxial deviation caused by too much.
5, in the inspection of materials, should be the material composition, microstructure, hardness and other inspection, but also on the damaged parts of the order and causal relationship analysis, and ultimately be able to identify the cause.
Fourth, the following are some of the quality problems in product manufacturing:
1, high noise: as long as other reasons are excluded, it should be a quality problem.
2, parts scratched: turn and scratches the side plate is relatively symmetrical, diagonal scratches the phenomenon should be quality problems.
3, the shaft fracture: When broken in the weakest place, while other parts are intact when the shaft is the quality problem.
4, the rotor fracture: the other pieces are not broken, only the rotor off, is a quality problem.
5, leaf fracture: the other pieces are not broken, only leaves off, is the quality problem.
Vane pump product manuals generally have detailed installation guidelines and precautions. However, in the actual use of the process, often there are still such problems and problems occur, the vast majority of these problems should be caused by improper use, improper use of oil pump damage accounted for up to 95% or more, the real problem is the product quality is Few. In order to distinguish what kind of problems belong to the correct use and determine the cause of the malfunction, special offers the following experience for reference: