Air inlet terminal and vacuum pump provided with air inlet terminal

Abstract

The invention discloses an air inlet terminal. The air inlet terminal comprises a terminal outer shell and a spring sealing assembly, wherein the terminal outer shell is of an integrated structure formed by connecting an upper shell body and a lower shell body; an air inlet channel is formed inside the upper shell body, a circular cavity is formed inside the lower shell body, and the air inlet channel can communicate with the circular cavity; the spring sealing assembly is arranged inside the lower shell body and comprises a rubber valve plate, a spring and a spring supporting base which are sequentially arranged from top to bottom, and the spring supporting base is detachably and fixedly connected with the lower shell body; and the lower end of the spring sleeves the spring supporting base, the upper end of the spring sleeves the bottom of the rubber valve plate, and the top of the rubber valve plate is in sealing fit with the top wall of the circular cavity to seal the air inlet channel of the upper shell body. The invention further discloses a vacuum pump. According to the air inlet terminal and the vacuum pump provided with the air inlet terminal, the rubber valve plate replaces a rubber ball, the overall weight is reduced, assembly and disassembly are easier, the process difficulty and manufacturing cost of the rubber valve plate are low, air extraction is smoother, the reverse sealing performance is better, the vacuum degree performance is higher, and noise is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of automobile braking control, in particular to an air intake terminal and a vacuum pump equipped with the air intake terminal, which are used in an automobile braking system. Background technique [0002] The vacuum pump draws air out of the booster through the inlet terminal, creating a vacuum in the booster chamber. At the same time, when the vacuum pump is working, lubricating oil is needed to achieve sealing and lubrication. The working medium of the air inlet terminal is oil and gas, and the oil and gas can only flow in one direction. This requires the air intake terminal to have the function of a one-way valve, but also to ensure a small opening pressure, so that it is easier for air to flow from the booster to the vacuum pump. At present, ordinary ball valve type check valves are mostly used as air intake terminals in the market. The valve body of ordinary ball valves is a rubber ball, which is pre...

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Problems solved by technology

[0004]Aiming at the deficiencies of the above-mentioned prior art, an object of the present invention is to propose an air intake terminal, which solves the problem that the opening pressure of the air intake terminal in the form of a ball valve is high, which is not conducive to vacuum pumps. Air is extracted, resulting in poor vacuum performance of the vacuum pump, and high requirements for the sphericity of the rubber ball, which is difficult to process and manufacture, and the surface is slightly out of tolerance, which is prone to the problem of reverse oil leakage

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