Piston-type reciprocating double-action single-cylinder pumping device of vacuum pump

Abstract

The invention provides a piston-type reciprocating double-action single-cylinder pumping device of a vacuum pump, which belongs to the field of vacuum pumps, and solves the problems of low working efficiency, uneven stress, high noise and the like of a traditional single-action vacuum pump. The piston-type reciprocating double-action single-cylinder pumping device of the vacuum pump comprises a cylinder body, a piston and a piston rod fixedly connected with the piston; the piston can move relative to the cylinder body; a sealing part which can prevent two cavities separated by the piston frombeing communicated is arranged between the piston and the cylinder body; the outer end of the piston rod extends out of the cylinder body, and a pumping channel is arranged in the piston rod; the piston is provided with a hollow structure which is connected with the pumping channel; both sides of the piston are fixedly provided with one-way valves 1 capable of preventing the air in the two cavities from entering the cavity of the piston, and both ends of the cylinder body are fixedly provided with one-way valves 2 capable of preventing outside air from entering the corresponding cavity. The piston-type reciprocating double-action single-cylinder pumping device of the vacuum pump adopts a double-action pumping method, doubles the working efficiency, and has uniform stress on all moving parts, little wear and low noise.

Description

Technical field [0001] The invention relates to an air extraction device of a vacuum pump, in particular to a piston type reciprocating double-acting single-cylinder air extraction device of a vacuum pump, belonging to the field of vacuum pumps. Background technique [0002] Any machine that extracts gas from the equipment to achieve a vacuum inside the equipment is called a vacuum pump. Vacuum pumps are widely used in plastic machinery, pesticide chemical industry, dye chemical industry, cryogenic equipment, food machinery, electronics industry, metallurgy, printing, petroleum, mining and foundation treatment According to the different modes of movement, vacuum pumps can be roughly divided into: reciprocating vacuum pumps, rotary vacuum pumps and jet vacuum pumps. Among them, the reciprocating vacuum pump is also called the piston vacuum pump, which makes the working volume of the pump chamber (cylinder) periodically change to pump air. [0003] The structure of the existing trad...

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Problems solved by technology

[0004] Obviously, in the above pumping structure, the pumping process is only carried out in the left cavity of the cylinder body, while the right cavity is in an idle state, so that the piston can only complete one suction and one row in the left cavity during reciprocating motion, which is a It is a single-acting structure, and the work efficiency is low; the air pressure in the left and right chambers of the cylinder is not uniform, so that the force on the piston close to the left chamber of the cylinder is large, and it is easy to wear; in addition, the suction valve and exhaust valve They are all located at the same end of the cylinder, causing the piston to easily generate shear wave inferior vibration during the process of suction and exhaust, resulting in high noise

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