Mechanical sealing device for single-stage centrifugal pump

Abstract

The invention relates to the technical field of mechanical engineering pumps, in particular to a mechanical sealing device for a single-stage centrifugal pump. The mechanical sealing device comprises a pump body, a pump shaft, an impeller, a mechanical sealing pump cover, a locating sleeve and a mechanical sealer. The mechanical sealing device is characterized in that a fixing hole is formed in the front end of the mechanical sealing pump cover, a sealing hole is formed in the rear end of the mechanical sealing pump cover, a mechanical sealing cavity and a mechanical sealing top groove are formed in the middle of the mechanical sealing pump cover, the mechanical sealing cover sleeves the pump shaft, the front end of the mechanical sealing pump cover is in sealing connection with the impeller through a sealing ring, the rear end of the mechanical sealing pump cover is connected with the pump shaft, the locating sleeve and the mechanical sealer are arranged in the mechanical sealing cavity, one end of the mechanical sealer is in sealing connection with the impeller through the locating sleeve, the other end of the mechanical sealer is clamped into the mechanical sealing top groove of the mechanical sealing pump cover, and a hole is formed in the lateral wall of the mechanical sealing pump cover. By means of reducing mechanical sealing parts, the sealing reliability is improved in operation of a pump. Furthermore, the whole weight of the pump is reduced, and the production cost of the pump is reduced. By means of the structure, the mechanical sealing device has the advantages of being novel in structure, convenient to install, a few in installation parts, high in sealing performance and the like.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering pumps, in particular to a mechanical seal of a single-stage centrifugal pump. Background technique [0002] At present, the existing single-stage centrifugal pump is composed of a pump body, a pump shaft, an impeller, a mechanical seal device and a bearing body. The mechanical seal device includes a mechanical seal pump cover, a mechanical seal gland, a mechanical seal, a positioning sleeve and a tight The pump shaft is supported by the bearing body, the front end of the pump shaft is fixedly connected with the impeller, the impeller is set in the pump body, the bearing body is fixedly connected with the pump body through the mechanical seal pump cover, in order to ensure that the liquid in the pump body cannot seep when the impeller is running. Leakage into the bearing body, usually there is a mechanical seal cavity between the impeller and the bearing body, and the mechanical sea...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing single-stage centrifugal pump is composed of a pump body, a pump shaft, an impeller, a mechanical seal device and a bearing body. The mechanical seal device includes a mechanical seal pump cover, a mechanical seal gland, a mechanical seal, a positioning sleeve and a tight The pump shaft is supported by the bearing body, the front end of the pump shaft is fixedly connected with the impeller, the impeller is set in the pump body, the bearing body is fixedly connected with the pump body through the mechanical seal pump cover, in order to ensure that the liquid in the pump body cannot seep when the impeller is running. Leakage into the bearing body, usually there is a mechanical seal cavity between the impeller and the bearing body, and the mechanical seal cavity is usually set in the center cavity of the mechanical seal pump cover, and the front end of the mechanical seal pump cover is provided with a Sealing hole, the middle part is provided with a through hole connected with the positioning sleeve, the rear part is provided with a mechanical seal cavity, the outer circumference of the mechanical seal pump cover has fixed holes connected with the bearing body, the through hole in the center of the mechanical seal pump cover and the mechanical seal The pump shaft in the cavity is fixed with a positioning sleeve, a mechanical seal and a mechanical seal gland in sequence. The front end of the mechanical seal pump cover is sealed with the impeller through the sealing ring, and the rear end is sealed with the mechanical seal pump cover through the fastening bolts. Yes: Due to the large number of mechanical seal parts, the precision of each mating surface cannot be guaranteed, resulting in a decrease in the sealing performance of the mechanical seal cavity

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