Pump shaft seal structure
Technical field
The utility model relates to fluid machinery technical field, specifically a kind of pump shaft sealing device of single stage centrifugal pump.
Background technique
At present, in pump design, flow passage components mainly comprise the pump housing, pump cover, impeller, impeller nut, mechanical seal and pump shaft, described impeller is located in the inner chamber of the pump housing, pump shaft is fixedly connected with impeller through impeller nut with pump cover through the pump housing, described pump cover is connected with shaft seal through mechanical seal, pump cover is through clamping bolt and pump housing fixed seal connection, after medium enters the pump housing from pump inlet, through impeller transmission, most of medium is transported to exit position by runner, part medium can enter Seal cage through impeller back, finally sealed by mechanical seal through axle, will make like this axial length phase be immersed in medium.Therefore,, in the time carrying Korrosionsmedium, axle need to adopt higher material configuration to meet, and has so not only improved manufacture cost, and has increased an easily worn part.
Summary of the invention
The purpose of this utility model is to solve above-mentioned the deficiencies in the prior art, a kind of novel structure, convenient disassembly is provided, effectively prevents that axle burn into from improving the pump shaft seal structure of pump bulk life time.
The utility model solves the technological scheme that its technical problem adopts:
A kind of pump shaft seal structure, comprise the pump housing, pump cover, impeller, impeller nut, mechanical seal and pump shaft, it is characterized in that being provided with protective shaft sleeve, sealing gasket and O type circle, described protective shaft sleeve is to be coaxially formed by fixedly connecting by location shoulder cover and sleeve, described protective shaft sleeve is the fixing shaft part of mechanical seal at pump shaft through sleeve fixed cover, and be connected with the impeller installation shaft part axial restraint of pump shaft through the location of protective shaft sleeve shoulder cover, mechanical seal inwall is tightly connected through O type circle and protective shaft sleeve, outer wall and pump cover are tightly connected, described impeller is tightly connected through sealing gasket and protective shaft sleeve, effectively prevent that medium from leaking on axle by the gap between impeller nut and impeller, fully guaranteed pump shaft not can with medium contact, can prevent dielectric leakage simultaneously.
The utility model is owing to adopting said structure, has the advantages such as good seal performance, low cost of manufacture, replacing be convenient and swift.
accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Reference character: impeller nut 1, impeller 2, sealing gasket 3, protective shaft sleeve 4, mechanical seal 5, pump shaft 6, the pump housing 7, pump cover 8.
Embodiment
As shown in drawings, a kind of pump shaft seal structure, comprise the pump housing 7, pump cover 8, impeller 2, impeller nut 1, mechanical seal 5 and pump shaft 6, annexation and the impeller 2 of the described pump housing 7 and pump cover 8, the annexation of impeller nut 1 and pump shaft 6 is same as the prior art, this does not repeat, it is characterized in that being provided with protective shaft sleeve 4, sealing gasket 3 and O type circle, described protective shaft sleeve 4 is to be coaxially formed by fixedly connecting by location shoulder cover and sleeve, described protective shaft sleeve 4 is the fixing shaft part of mechanical seal 5 at pump shaft 6 through sleeve fixed cover, and be connected with the impeller installation shaft part axial restraint of pump shaft 6 through the location of protective shaft sleeve 4 shoulder cover, mechanical seal 5 inwalls are tightly connected through O type circle and protective shaft sleeve 4, outer wall and pump cover 6 are tightly connected, described impeller 2 is tightly connected through sealing gasket 3 and protective shaft sleeve 4, effectively prevent that medium from leaking on axle by the gap between impeller nut 1 and impeller 2, fully guaranteed pump shaft 6 not can with medium contact, can prevent dielectric leakage simultaneously, like this, in the time carrying Korrosionsmedium, axle can be selected lower material, reduce manufacture cost, it is convenient that protective shaft sleeve 4 is changed, manufacture simple, coordinate with O RunddichtringO, form a set of reliable shaft seal structure, the utility model is owing to adopting said structure, there is good seal performance, low cost of manufacture, change the advantages such as convenient and swift.