Bidirectional noncontact type cooling dynamic sealing method for two-grade liquid ring pump

Abstract

The invention relates to a bidirectional noncontact type cooling dynamic sealing method for a two-grade liquid ring pump. The bidirectional noncontact type cooling dynamic sealing method is suitable for bidirectional noncontact friction type cooling dynamic seal between a rotating assembly and a static assembly of a two-grade liquid ring pump. A bidirectional spiral liquid supply mechanism, which is an intermediate wall assembly combination, is arranged between the rotating assembly and the static assembly of the two-grade liquid ring pump, and the noncontact type cooling dynamic sealing is adopted; the rotating assembly comprises a bidirectional spiral sleeve, a high-pressure chamber impeller, a low-pressure chamber impeller and a liquid ring pump shaft; the static assembly is the intermediate wall assembly; the bidirectional spiral liquid supply mechanism, which is the intermediate wall assembly combination, comprises a bidirectional spiral sleeve and an intermediate wall assembly, wherein the bidirectional spiral sleeve is embedded on a shaft of the intermediate wall section of the liquid ring pump; and the bidirectional spiral sleeve and the intermediate wall assembly form the suitable bidirectional spiral liquid supply mechanism which is the intermediate wall assembly combination. According to the bidirectional noncontact type cooling dynamic sealing method, the hydraulic sealing is carried out; hubs of impellers of a high-pressure chamber and a low-pressure chamber are flushed to be cooled, so that the hubs of the impellers can be prevented from thermally deforming, the stability of the liquid ring pump in running is improved, the service life of parts is prolonged, and the sealing structure assembling difficulty is reduced.

Description

technical field [0001] The invention relates to a bidirectional non-contact cooling dynamic sealing method for a two-stage liquid ring pump, which is suitable for bidirectional non-contact frictional cooling dynamic sealing of a rotating assembly and a stationary assembly of a two-stage liquid ring pump. Background technique [0002] The two-stage liquid ring pump is provided with an intermediate wall assembly 6 between the high-pressure chamber impeller 4 and the low-pressure chamber impeller 9, which isolates the high-pressure chamber 5 and the low-pressure chamber 10 and connects them in series. The gas port connects the two-stage impeller chambers in series, so as to realize the two-stage compressed delivery of gas. Due to the pressure difference between the high-pressure chamber and the low-pressure chamber, in order to prevent the backflow of gas and liquid from the outer circle of the liquid ring pump shaft 1 and the inner hole of the intermediate wall assembly 6, whi...

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Problems solved by technology

[0004] Its defect is that the sealing structure is a dynamic friction seal. During the working process, the PTFE piston ring 14 has a relatively high-speed rotational movement relative to the inner hole of the intermediate wall assembly 6 and the annular groove of the intermediate wall bushing 13. After a period of operation, it will seriously develop Damage the inner hole of the intermediate wall assembly and the annular groove of the intermediate wall bushing, and the PTFE piston ring will also break and fall off, resulting in the failure of the seal between the high and low pressure impeller chambers and backflow, affecting the pumping of the liquid ring pump performance and stability

At the same time, because there is no cooling at the hub of the impeller in the high and low pressure chamber, it is easy to cause thermal deformation of the hub of the impeller in the high and low pressure chamber, which will damage the intermediate wall assembly 6 and affect the operation stability of the liquid ring pump.

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