Pump shaft sleeve for double suction pump

Abstract

The invention discloses a pump shaft sleeve for a double suction pump. The pump shaft sleeve comprises a shaft sleeve body. A cylindrical cavity structure is arranged in the shaft sleeve body. An annular groove is formed in the inner wall of the left side of the shaft sleeve body. An arc structure smoothly connected with the shaft sleeve body is arranged on the outer side of the right end of the shaft sleeve body. An annular step is arranged at the position, corresponding to the arc structure, of the inner wall of the shaft sleeve body. Multiple through holes are evenly formed in the peripheryof the shaft sleeve body. Compared with the prior art, the pump shaft sleeve has the following beneficial effects that the annular groove of the shaft sleeve cooperates with a pump shaft to form a closed oil cavity, the lubricating time of the shaft and a bearing can be effectively increased, and the service life of the shaft can be prolonged; the through holes are formed in the shaft sleeve body, and therefore concentration of bubbles on the surface of the shaft sleeve can be reduced, and the bad influence generated by cavitation on the shaft sleeve is avoided; and a part matched with the step formed by an impeller and the pump shaft is arranged at the right end of the shaft sleeve, the axial locating function can be achieved on the impeller, the outer side of the shaft sleeve and the impeller are in smooth transition, resistance to water flow is reduced, and the work efficiency of the double suction pump is improved.

Description

technical field [0001] The invention belongs to the technical field of double-suction pump accessories, and in particular relates to a pump shaft sleeve for a double-suction pump. Background technique [0002] In the accessories of double-suction pumps, the shaft sleeve is set outside the pump shaft. The main function is to avoid the direct wear of the pump shaft at the seal. The shaft sleeve is used to directly rub against the packing, which can seal without wearing the pump shaft. At the same time, it can also play an axial positioning role for the impeller, but the existing shaft sleeve is usually a hollow cylindrical structure, which is directly sleeved outside the pump shaft, forming a certain step at the impeller, thereby increasing the resistance to the water flow there, and In the corresponding position of the seal, due to premature wear, it often leads to seal failure. During the working process of the centrifugal pump, cavitation will affect the erosion of the inne...

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Problems solved by technology

[0002] In the accessories of double-suction pumps, the shaft sleeve is set outside the pump shaft. The main function is to avoid the direct wear of the pump shaft at the seal. The shaft sleeve is used to directly rub against the packing, which can seal without wearing the pump shaft. At the same time, it can also play an axial positioning role for the impeller, but the existing shaft sleeve is usually a hollow cylindrical structure, which is directly sleeved outside the pump shaft, forming a certain step at the impeller, thereby increasing the resistance to the water flow there, and At the corresponding position of the seal, due to premature wear, it often leads to seal failure. During the working process of the centrifugal pump, cavitation will affect the erosion of the inner and outer surfaces of the shaft sleeve, which will bring difficulties to the dismantling and repair of the pump body, and even make the pump shaft scrapped

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