Sealing structure of single-stage single-suction centrifugal pump for chemical procedure

Abstract

The invention relates to a seal structure of a single-stage and single-suction chemical process centrifugal pump, and comprises a pump cover (1), a shaft sleeve (2), a seal chamber (3), a mechanical seal (4), a mechanical seal cover (5), and a pump chamber (6), as well as a spiral seal (7). One end of the spiral seal (7) is connected to the pump cover (1) and the seal chamber (3), while the other end of the spiral seal (7) is connected to the pump chamber (6). The beneficial effect of the invention is that the medium pressure entering the seal chamber is greatly reduced due to the pumping function of the spiral seal; thus, a general mechanical seal can be used to reduce the cost; on the other hand, the specific pressure of an end surface of the mechanical seal can be reduced, and abrasion of a friction pair is reduced, so as to prolong the usable life of the mechanical seal.

Description

technical field [0001] The invention relates to a single-stage single-suction chemical process centrifugal pump, in particular to a sealing structure in the single-stage single-suction chemical process centrifugal pump. Background technique [0002] It can be seen from FIG. 1 that in the existing single-stage single-suction centrifugal pump, the sealing chamber 3 is a cavity surrounded by the pump cover 1 , the shaft sleeve 2 , the mechanical seal 4 and the mechanical seal gland 5 . When the shaft seal adopts a mechanical seal, there is no auxiliary seal in the sealing chamber 3, which is feasible when the working pressure of the pipeline is relatively low; but when the working pressure of the pipeline is relatively high, the pressure in the sealing chamber 3 is correspondingly relatively high high. Take hot water as an example: on the one hand, when delivering hot water, the working pressure can reach up to 4Mpa (at 250°C), and the pressure limit that the existing mechanic...

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Problems solved by technology

Take hot water as an example: on the one hand, when delivering hot water, the working pressure can reach up to 4Mpa (at 250°C), and the pressure limit that the existing mechanical seal can withstand is generally below 2.5Mpa, so there is no pressure in the sealing chamber 3 It is not acceptable to set any auxiliary seal; on the other hand, due to the high pressure in the seal chamber, the specific pressure of the end face of the mechanical seal 4 is very high, resulting in increased wear of the friction pair, even if the mechanical seal 4 can withstand the pressure from the pump chamber 6, Its lifespan is also greatly shortened

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