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What are the main reasons for the wear of stainless steel gear pumps?

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KCB stainless steel gear pump is equipped with a safety valve as overload protection. The full return pressure of the safety valve is 1.5 times the rated exhaust pressure of the pump. It can also be adjusted according to actual needs within the allowable discharge pressure range. However, please note that this safety valve cannot be used for long-term operation of the pressure reducing valve, and can be separately installed on the pipeline when needed. KCB stainless steel gear pump is mainly used for conveying lubricating oil in the lubrication system of various mechanical equipment. It is suitable for conveying the viscosity of 5 × 10-6 ~ 1.5 × 10-3m2 / s (5-1500cSt) and the temperature below 300 ℃. Lubricating oil. Stainless steel gear pump can transport non-lubricating oil, beverages and low-corrosive liquids. Equipped with copper gear can transport low internal point liquids, such as gasoline, benzene and so on. In addition to ordinary motors, this series of pumps can also be equipped with explosion-proof motors of the same specifications according to user needs.
KCB stainless steel gear pump leaks during the static test installation. During use, the inner rotor of the stainless steel gear pump is the driving wheel, and the outer rotor is the follower theory. Because the number of teeth of the inner and outer rotors differs by one tooth, there are secondary meshes during the meshing process, which will form several independent closed liquid-encapsulated cavities. As the internal and external rotors engage and rotate, the volume of each liquid-filled cavity changes differently: when the volume of the liquid-filled cavity changes from small to large, a partial vacuum is generated in the liquid-filled cavity. Under the effect of atmospheric pressure, the liquid passes through the inlet pipe and pump The annular groove on the cover enters the pump chamber to start aspiration. When the volume of the liquid-filled chamber reaches the maximum. The aspiration process ends; when the volume in the fluid-filled cavity changes from large to small. The liquid in the liquid-sealing chamber is pushed out from the other annular groove, which is the drainage process of the pump. During the operation of the internal gear pump, when the inner and outer rotors are running in the same direction at different speeds around two axes parallel to each other, relative motion will occur. This movement creates a constantly changing space between the inner and outer rotors, which is connected to the liquid suction and discharge channels to achieve the purpose of suction and discharge.
Stainless steel pumps are pumps made of stainless steel. Stainless steel pumps mainly include YCB stainless steel circular arc gear pumps, stainless steel circular arc heat preservation pumps, KCB stainless steel gear pumps, NCB series stainless steel high viscosity rotor pumps, and FXA-FXB type external lubrication stainless steel gear pumps , CB stainless steel gear pump, stainless steel food sanitation pump, antiseptic chemical pump, etc.
CB stainless steel gear pump is a positive displacement gear pump with internal gears in the form of arc teeth and new gear pumps with short outer cycloids. The pump has a simple structure, low noise, stable oil delivery, good self-priming performance, reliable operation and long service life. Widely used in the low-pressure hydraulic drive system of machine tools and the oil supply and cooling system of thin oil stations in large machinery and equipment, and the lubrication system of various machinery and equipment
KCB stainless steel gear pump is mainly composed of gear, shaft, pump body, safety valve and shaft end seal. The gear has high hardness and strength after heat treatment, and it is installed in the replaceable sleeve to run with the shaft. The lubrication of all parts in the pump is automatically achieved by using the output medium when the pump is working.
NCB stainless steel high-viscosity rotor pump adopts the internal meshing principle. The internal and external gear pitch circles are close to one side and the other side is separated by the "crescent plate". The gears rotate in the same direction without liquid trapping. Advanced structure, small size, large flow, noise Low and long life.
FXA-FXB type stainless steel gear pump is suitable for conveying non-lubricating, corrosive, and high hygienic conditions. It does not contain solid particles, fibers and other general viscosity and high viscosity fluids. Medium temperature: -20-80 ° C, viscosity: 5-5000cst.
KCB stainless steel gear pump can transport corrosive and lubricating media, regardless of the medium viscosity. It can be used in different industries. It can fully play a good role and value in the industry, but there will be certain wear conditions in use. The wear parts of the gear are mainly the meshing of the teeth, the involute working surface and the planes at both ends of the gear. When it is slightly worn, the tooth surface can be polished with oil stone, and the two ends are flat and polished on the plate. When the tooth surface of the gear is severely worn, it should be replaced with a new gear. If only the planes at both ends of the gear are worn, they can be ground and polished on a surface grinder. The causes of wear of stainless steel gear pumps are mainly manifested in the following main aspects.
The wear of the shaft in the KCB stainless steel gear pump is mainly due to the friction and wear between the two ends of the shaft and the supporting needle, which makes the shaft diameter smaller. If it is slightly worn, the diameter of the shaft can be enlarged by hard chromium plating to repair the shaft. If the shaft is severely worn, it should be remanufactured with 45 steel or 40Cr steel. After roughing and finishing of the shaft blank, the bearing parts should be heat treated with a hardness of HRC60-65, and then ground to make the surface roughness Ra of the mating part of the bearing Greater than 0.32μm; the tolerance of roundness and cylindricity of the shaft is 0.005mm; according to H7 / h6 with the gear, the surface roughness Ra should not be greater than 0.63μm.
The surface wear of KCB stainless steel gear pump body is mainly the arc-shaped working surface in the suction section. If there is slight wear, you can use burr to grind and remove burrs. The pump body is formed from cast iron casting blanks, which should be replaced with new ones when severe wear occurs. The end cover of the stainless steel gear pump is made of cast iron. After the wear phenomenon occurs, it can be slightly ground and flattened on the flat plate. When the wear is more serious, it should be ground and ground on a surface grinder. The plane contact between the ground end cap and the pump body should be no less than 85% flatness tolerance, the vertical tolerance of the end face to the centerline of the hole, the parallelism tolerance of the two end faces, and the centerline of the two axis The tolerance of parallelism is O.Olmm. The surface roughness Ra after grinding should not be greater than 1.25 μm. If both ends of the internal gear of the pump are repaired by grinding, the width of the pump body must also be changed, which is the same as the size of the two ends of the gear. The two ends of the pump body after reprocessing should meet the standard technical requirements.
After the parts in the KCB stainless steel gear pump are repaired, the bearing needle should be replaced. The requirements for needle rollers are: the dimensional error of all needle roller diameters should not exceed 0.003mm, the length tolerance is 0.1mm, and the gap between the shaft and the shaft should be about 0.001mm; when the needle rollers are assembled, the bearing housing should be filled according to the quantity requirements. The needles should be arranged parallel to each other.
KCB stainless steel gear pump should be well inspected and repaired after a certain amount of wear and tear, and maintained and repaired according to certain methods and principles, and arranged and set up in time.
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