Circulation balance sealing box assembly of plunger pump

Abstract

A circulation balance sealing box assembly of a plunger pump comprises a sealing box body, a plunger and a circulation cylinder. An oil compensation valve for compensating oil for a sealing box body cavity, an exhaust valve for exhaust, a pressure relief valve used for maintaining internal normal pressure of the circulation pump and a pressure-difference valve used for maintaining normal work of the oil compensation valve are arranged in the circulation cylinder. The circulation cylinder is connected with the sealing box body through a connection pipe, and the sealing box body is communicated with an oil inlet of the oil compensation valve in the circulation cylinder and an air inlet of the exhaust valve through an internal hole channel and the connection pipe. The assembly can achieve the state of no leakage between a plunger and a seal, prolongs service life of quick-wear parts due to the fact that lubricating oil has the effect of lubricating friction continuously in the moving process of the plunger and the seal, improves efficiency, resolves the problem that the plunger and the seal of the existing plunger pump are short in service life and media are apt to leakage, and achieves the aim that lubricant can automatically compensate the sealing box assembly.

Description

technical field [0001] The invention relates to a circulation balance sealing box assembly. Background technique [0002] Traditional plunger pumps are equipped with a sealing box, which consists of a sealing box body 1', a plunger 2', a guide sleeve 3', a packing 4' (5-6 pieces in one set), a pressure ring 5', and an adjusting nut 6'. '(See Figure 4 ). When the plunger 2' moves backwards and forwards, the liquid inlet valve is opened, and the liquid enters the pump chamber. When the plunger 2' reciprocates forward, the liquid inlet valve is closed, the liquid in the pump cavity is squeezed, the liquid discharge valve is opened, and the liquid is discharged from the liquid discharge valve until the plunger moves to the position of the front dead point, the liquid discharge process End, and then start the next suction and discharge cycle. During the forward movement of the plunger 2', due to the instantaneous high pressure, the high-pressure liquid enters the gap between ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a plunger pump circulation balance sealing letter assembly to solve the problems of the existing plunger pumps such as the short life of the plunger and seal and the easy leakage of the medium, so that the plunger, seal Effectively achieve a no-leakage state, so that the plunger and seal are continuously lubricated by lubricating oil for friction lubrication during the movement process, thereby prolonging the life of wearing parts and improving efficiency, and achieving the purpose of automatic lubricant compensation for sealing letter assembly

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