Mechanical seal shaft sleeve for inlet high-pressure pump

Abstract

The invention relates to the technical field of mechanical engineering pumps, in particular to a mechanical seal shaft sleeve for an inlet high-pressure pump. The shaft sleeve is provided with a mechanical seal shaft sleeve body, and the outer end face of the mechanical seal shaft sleeve body is sequentially composed of a mechanical seal installation table top, a cover installation table top and a positioning ring clamping groove. The mechanical seal shaft sleeve is characterized in that a shaft shoulder positioning sleeve is arranged at the front end of the mechanical seal shaft sleeve body, and the inner diameter of the shaft shoulder positioning sleeve is smaller than that of the mechanical seal shaft sleeve body, so that a stepped hole is formed due to the inner diameter of the mechanical seal shaft sleeve body and the inner diameter of the shaft shoulder positioning sleeve, the mechanical seal shaft sleeve is positioned by a pump shaft shoulder during assembly, the defect that the mechanical seal shaft sleeve is positioned by a clamping flange and accordingly sealing is unstable is overcome, and the mechanical seal shaft sleeve has the advantages of being simple in structure, reliable and stable in operation, long in service life and the like.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering pumps, in particular to a mechanical seal shaft sleeve for an inlet high-pressure pump. Background technique [0002] As we all know, there is a pressure difference between the fluid in the pump and the atmosphere outside the pump, and the fluid leaks out along the gap between the shaft and the casing. Therefore, the shaft seal is an indispensable structure in the pump. In the working environment where the pressure of the pump seal is high , the sealing problem is difficult to solve, and the requirements for the mechanical seal are very high. The inner diameter of the mechanical seal shaft sleeve in the existing mechanical seal cavity is a cylindrical hole, and the outer end surface is composed of the mechanical seal installation table, the cover body installation table, and the positioning ring in turn. The groove and clamping flange clamp the table. The mechanical seal is usually ...

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Problems solved by technology

[0002] As we all know, there is a pressure difference between the fluid in the pump and the atmosphere outside the pump, and the fluid leaks out along the gap between the shaft and the casing. Therefore, the shaft seal is an indispensable structure in the pump. In the working environment where the pressure of the pump seal is high , the sealing problem is difficult to solve, and the requirements for the mechanical seal are very high. The inner diameter of the mechanical seal shaft sleeve in the existing mechanical seal cavity is a cylindrical hole, and the outer end surface is composed of the mechanical seal installation table, the cover installation table, and the positioning ring in turn. The groove and clamping flange clamp the table. The mechanical seal is usually slid on the pump shaft and positioned by the clamping flange at the other end of the mechanical seal shaft sleeve. This friction force is related to the fastening condition of the assembler. Under normal working conditions, the pressure of this sealing chamber can ensure the effective sealing of the mechanical seal. When high pressure is generated in the mechanical seal cavity, this The stability of the mechanical seal shaft sleeve is determined by the assembler's own skills and fastening conditions. Therefore, the high pressure resistance of this mechanical seal shaft sleeve is very unstable, which greatly affects the reliability and safety of the pump body. , resulting in shortened service life

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