Sealing device for plunger pump and plunger pump

Abstract

The invention discloses a sealing pump for a plunger pump and the plunger pump. The sealing device comprises a pump cylinder body, a plunger part, a stuffing box, a pressing cover, a dust-proof sealing piece and an anti-abrasion sealing piece, wherein a plunger hole is formed in the pump cylinder body; one end of the plunger part stretches into the plunger hole; the stuffing box is in a cylindrical shape, one end of the stuffing box stretches into a sealing cavity, and the other end of the stuffing box is arranged outside the sealing cavity; the sealing cavity is an annular cavity which is formed between opposite circumferential surfaces of the plunger part and the plunger hole; one end, which stretches into the sealing cavity, of the stuffing box is provided with an annular flange; the outer circumferential surface of the stuffing box is in clearance fit with the inner circumferential surface of the plunger hole; a stuffing cavity is formed in space among the end surface, which faces the outer part of the plunger pump, of the annular flange, the inner circumferential surface of the stuffing box and the outer circumferential surface of the plunger part, and a sealing piece is arranged in the stuffing cavity and is pressed by the pressing cover; a sealing ring is arranged between opposite surfaces of the stuffing box and the pump cylinder body. According to the sealing device for the plunger pump, disclosed by the invention, sealing can be ensured, the sealing piece can be conveniently taken out, and a function of preventing dust in air from entering the sealing surface is obtained. The invention also discloses the plunger pump which is provided with the sealing device.

Description

Technical field: [0001] The invention relates to a sealing device for a plunger pump and the plunger pump. Background technique: [0002] As a common equipment for conveying high-viscosity fluid, the plunger pump is responsible for the transportation of highly corrosive, toxic, high-viscosity and high-pressure media in various industries. When the plunger pump is working, the pump cylinder of the plunger pump The pressure is huge, and good sealing is essential for the pump cylinder. At present, the sealing of the pump cylinder is mainly to install various types of seals in the sealing space formed between the plunger and the pump cylinder, and then use The compression cover is pressed tightly; after the plunger pump has been working for a period of time, it will cause the wear of the seals. It is necessary to check the seals regularly and replace the seals that cannot meet the standard. When checking and replacing the seals, it is necessary to open the pressure Tighten the ...

AI Technical Summary

Problems solved by technology

[0002] As a common equipment for conveying high-viscosity fluid, the plunger pump is responsible for the transportation of highly corrosive, toxic, high-viscosity and high-pressure media in various industries. When the plunger pump is working, the pump cylinder of the plunger pump The pressure is huge, and good sealing is essential for the pump cylinder. At present, the sealing of the pump cylinder is mainly to install various types of seals in the sealing space formed between the plunger and the pump cylinder, and then use The compression cover is pressed tightly; after the plunger pump has been working for a period of time, it will cause the wear of the seals. It is necessary to check the seals regularly and replace the seals that cannot meet the standard. When checking and replacing the seals, it is necessary to open the pressure Tighten the cover and take out the seal. Since the sealing space is narrow and long, and most of the seals are endless with smooth surface and end-to-end connection, when the seal is taken out, it cannot be properly grasped, and the seal is easy to be damaged. Some seals that do not need to be replaced or can be reused cannot be reused

[0003] In plunger pumps, seals that are pressed against the outer peripheral surface of the plunger by the rebound force generated by their own elastic deformation are often used. For the convenience of expression, this type of seal is called: pressureless seal; The pressureless seal cannot be subjected to axial pressure. If axial pressure is applied to the pressureless seal, it will cause undesirable deformation of the pressureless seal and reduce the sealing effect of the pressureless seal; at present, the seal chamber used to install the seal There is only one, and the non-pressure seal is installed in the same sealing cavity as other types of seals, and at the same time, it is subjected to the axial pressure exerted by the compression cover, which will cause bad deformation of the non-pressure seal and reduce the sealing effect

[0004] At present, the focus on the plunger pump is mainly on how to prevent the material in the pump cylinder from leaking out, usually ignoring the influence of the external environment on the plunger pump; the atmosphere contains various dusts, some of which have very high hardness, these Dust will adhere to the outer peripheral surface of the plunger part exposed to the air. During the continuous reciprocating movement of the plunger part, some dust particles will inevitably enter the contact surface between the plunger part and the seal, and the seal will be continuously worn and plunger portion, thereby reducing the sealing effect of the seal

Images