In fact, the stability of the pump is also a major requirement for our choice of pumps. We all know that the cost of the pump's lifetime consumption, the price is only a small part of it, so it is very important to maintain daily stability, which can extend the life expectancy. The cost of stainless steel "target=_blank> stainless steel gear pump noise situation and solutions with the continuous development of the economy, the continuous improvement of the level of science and technology, people's living standards are also higher and higher. The development of the pump industry is also It is getting faster and faster, especially some working environments are somewhat complicated, and the performance requirements for its sealing are also very high. If the leakage occurs, the consequences are very serious.
1. When installing the static test, the stainless steel "target=_blank> stainless steel gear pump has the inner rotor as the driving wheel and the outer rotor as the driven wheel. Since the inner and outer rotors have one tooth difference, there are two in the meshing process. The secondary meshing will form several independent closed liquid chambers. With the meshing rotation of the inner and outer rotors, the volume of each liquid chamber changes differently: when the volume of the liquid chamber increases from small to large, a local part is formed in the liquid chamber. Under vacuum, under the action of atmospheric pressure, the liquid enters the pump chamber through the annular groove on the inlet pipe and the pump cover, and starts to absorb liquid. When the volume of the liquid chamber reaches the maximum, the liquid absorption process ends; when the volume in the liquid chamber is large When the temperature is small, the liquid in the liquid chamber is pressed out from the other annular groove, which is the pump discharge process. During the working process, the inner and outer rotors are running in the same direction at different speeds on two parallel axes. Relative movement must occur. This movement creates a constantly changing space between the inner and outer rotors, and is connected to the liquid suction drain to achieve the purpose of suction and discharge.
Causes stainless steel "target=_blank> stainless steel gear pump noise due to the following conditions
(1) The phenomenon of "air pocket" and "sucking" phenomenon "cavitation" and "sucking" phenomenon are one of the main causes of excessive noise of stainless steel "target=_blank> stainless steel gear pump. In flowing liquid, Because the pressure at a certain point is lower than the air separation pressure, it is called "cavitation" phenomenon. After the air is separated, a large number of bubbles are formed, which causes the original continuous oil to become discontinuous, and these bubbles As the oil enters the high pressure chamber from the low pressure chamber of the gear pump, it ruptures rapidly under the impact of the pressure oil. This process occurs instantaneously and causes local hydraulic shock. In the place where the bubbles condense, the pressure and temperature will rise sharply. High, causing strong vibration and noise. When the "cavitation" phenomenon occurs, it is often accompanied by howling and causing fluctuations in system pressure, causing the equipment to sometimes not work properly. At this time, if the suction pipe joint and the shaft extension oil seal are The sealing is not good, the oil inlet pipe is blocked, the liquid level in the oil tank is too low, and the viscosity of the oil is too high, which will cause the vacuum of the oil suction port of the gear oil pump to be too high, so that the air penetrates, resulting in "sucking" phenomenon. Bubbles enter stainless steel" target=_blank >The high-pressure cavity of stainless steel gear pump also produces "cavitation" phenomenon, causing vibration and noise.
At present, the usual measures are as follows: 1 Select the larger diameter suction pipe according to the actual flow of the gear pump. The piping arrangement should be as reasonable as possible to reduce the local resistance of the pipeline and ensure the flow rate of the stainless steel "target=_blank> stainless steel gear pump suction pipe oil 2 —3 m/s. Check the viscosity of the hydraulic oil. If it is too high, replace the hydraulic oil and clean the pipeline regularly. 2 Check whether the seal at the suction pipe joint is reliable, whether the oil seal at the shaft extension is worn or deformed, otherwise replace the seal; 3 Large-capacity oil suction filter, and installed in the lower part of the fuel tank as much as possible to ensure the oil-passing capacity of the oil filter, clean the oil filter regularly; 4 regularly check the oil level, add hydraulic oil, so that the liquid level in the oil tank is higher than the gear The suction port of the pump.
(2) Excessive wear and tear of parts. Stainless steel "target=_blank> stainless steel gear pump in the process of use, due to internal parts wear and tear, excessive clearance, seal damage, etc., will cause large internal leakage of the gear pump (high, low pressure The cavity is connected to cause a sudden change in the flow rate and pressure of the pump, which generates vibration and noise. The solution is as follows: 1 Check whether the matching gap between the sliding bearing of the gear pump and the gear journal is normal, otherwise replace; 2 check the bushing (or side plate) and Whether the gear mating surface is damaged. If abnormality is found, take the side of the grinding gear according to the specific conditions, the end face of the bushing and the end face of the casing or replace the parts to ensure the best clearance 0.12—0.18mm, reduce the stainless steel†target= _blank>The internal leakage of the stainless steel gear pump reduces noise.
(3) Tooth shape error produces noise such as gear surface roughness difference, tooth shape error, tooth shape deformation, etc., which will cause gear meshing unevenness and cause noise. The usual method is: 1 for large displacement and high tolerance The gear pump of the load, in order to improve the tooth profile accuracy of the gear teeth, usually adopts a grinding process, which can correct the tooth profile error caused by the heat treatment deformation of the gear, improve the roughness of the tooth surface, meet the requirements of the meshing precision, and reduce the noise; 2 For medium and small displacement gear oil pumps, if the grinding process is not used, the gear pump noise can be reduced by improving the accuracy of gear cutters and processing equipment without reducing the tooth profile, and the noise of the gear pump can be reduced. At the same time of the tooth profile accuracy, the method of changing the tooth profile of the gear teeth achieves the good effect of "low noise". The general measure of gear pump vibration is to add an accumulator and a silencer at the oil outlet of the gear pump to achieve Reduce the noise effect. Stainless steel "target=_blank> stainless steel gear pump speed is too high, will produce resonance. When the pump's basic frequency and its resonant frequency and mechanical or hydraulic natural frequency are consistent. Noise If the oil is not properly selected, the viscosity is too large, the suction resistance of the hydraulic pump increases, and noise is generated. The cross section of the flow passage in the pump suddenly expands and contracts, and the sharp bend. The cross section of the passage is too small, which may cause turbulence in the oil, vortex and Jet flow, so that the noise is increased. Others such as improper bearing assembly, damage. The coaxiality of the pump shaft and the supporting equipment installation will also make the noise increase. It should be checked in time and replaced if necessary.
In fact, the stability of the pump is also a major requirement for our choice of pumps. We all know that the cost of the pump's lifetime consumption, the price is only a small part of it, so it is very important to maintain daily stability, which can extend the life expectancy. cost. The introduction of the above points is the reason for the noise of stainless steel "target=_blank> stainless steel gear pump, and the solution.
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Several cases of noise in stainless steel gear pump and solutions "> Edit: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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