Reciprocating type low-temperature pump liquid inlet valve structure

Abstract

The invention discloses a reciprocating type low-temperature pump liquid inlet valve structure. The structure comprises an air cylinder sleeve, a piston, a piston ring, an elastic ring, a guide ring,a liquid inlet valve head, a check ring, an air returning opening, a liquid draining opening and a liquid inlet opening; the piston and the liquid inlet valve head are arranged in the air cylinder sleeve of a liquid inlet valve body, the liquid inlet valve head is located on the front end of the piston, the guide ring, the piston ring and the elastic ring are arranged at the position, on the frontend of the piston, of the wall of the air cylinder sleeve, the elastic ring is arranged at the bottom of the piston ring, the liquid draining opening is connected into the air cylinder sleeve, and the air returning opening and the liquid inlet opening are connected with the two sides of the air cylinder sleeve. According to the novel liquid inlet valve structure, a fixed type liquid inlet valve base in the existing structure is omitted, the volume of the piston is utilized, under the condition that the original function of the pump body is kept unchangeable, the pump body structure is simplified, machining parts are reduced, manufacturing assembly is facilitated, and production cost is reduced.

Description

technical field

[0001] The invention belongs to the field of low-temperature liquid filling and transportation, and in particular relates to a liquid inlet valve structure of a reciprocating low-temperature pump. Background technique

[0002] The reciprocating cryogenic liquid pumps currently on the market are mainly composed of a pump body, a motor, a reduction device, a pressure gauge, an on-site control cabinet and various connecting pipelines. The pump body is mainly composed of pump casing, piston, cylinder liner, liquid inlet valve, liquid discharge valve and other components. Its working principle is: low-temperature liquid enters the cylinder liner from the liquid inlet valve, obtains pressure energy through the piston, and then discharges the liquid through the liquid discharge valve; Separate arrangement and many installation positions make the overall size of the pump body too large, and there are many parts and complicated processing. In addition, the pump head ...

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