Reciprocating pump reduced pressure sealing shaft-seal device

Abstract

The invention relates to a decompression sealing shaft seal device for reciprocating pumps, which includes an inner sealing ring and an outer sealing ring, a pressure reducer and a residual pressure return valve, the inner sealing ring and the outer sealing ring have the same structure, respectively It is placed in the cylindrical holes at both ends of the outer shaft sleeve, and placed outside the packing culvert of the pump body together; the pressure reducer is composed of a film, a skeleton, and a pressure ring to form an assembly, which is placed in the middle of the packing culvert as a whole, that is, the inner shaft Between the sleeve and the outer shaft sleeve; the structure of the residual pressure return valve is a solid spherical body, placed on the right side of the inner shaft sleeve, the valve hole communicates with the flow channel on the left side, and is placed inside the packing culvert as a whole. The advantages of the present invention are: it is convenient for serialization and standardized design, and it can be used as a set for plunger pump manufacturers; it is easy and fast to install on site, and is suitable for on-site shaft seal transformation of pumps in use; it has long continuous operation period, high safety and reliability, and no leakage.

Description

technical field [0001] The invention relates to a shaft sealing device for reciprocating pumps, in particular to a decompression sealing shaft sealing device for reciprocating pumps. Background technique [0002] At present, most of the shaft seal structures used in reciprocating pumps (also known as: plunger pumps below) are packing seals. Due to the high pressure of the plunger pump medium, there are serious problems of shaft seal leakage and packing filling technology. The surface wear problem of the plunger shaft (referred to as: the same below the shaft) is caused by the reason. Contents of the invention [0003] In view of the above reasons, the object of the present invention is to provide a decompression sealing shaft sealing device with good sealing performance and no damage to the shaft surface. [0004] The object of the present invention is achieved through the following technical scheme, which includes an inner sealing ring (14) that prevents the medium from ...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the shaft seal structures used in reciprocating pumps (also known as: plunger pumps below) are packing seals. Due to the high pressure of the plunger pump medium, there are serious problems of shaft seal leakage and packing filling technology. The surface wear of the plunger shaft (abbreviation: the same below the shaft) caused by the cause

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