Low-air-pressure electromagnetic shielding safety valve

Abstract

The invention discloses a low-air-pressure electromagnetic shielding safety valve, which comprises a waveguide base, an airtight diaphragm, an upper pressing sheet, a magnet, a connecting shaft, a rubber magnetic strip and a fixing flange; the upper pressing sheet, the airtight diaphragm and the waveguide base are sequentially connected through the connecting shaft from top to bottom; the rubber magnetic strip is fixed into a groove in the upper surface of the waveguide base; the magnet is fixed to the lower surface of the upper pressing sheet and matched with the rubber magnetic strip to achieve opening and closing between the waveguide base and the airtight diaphragm; and the fixing flange is used for being connected with a front-end product. According to the low-air-pressure electromagnetic shielding safety valve, a waveguide material is adopted as an electromagnetic shielding material, the corresponding electromagnetic shielding demand can be met after the waveguide base and the inflatable product are fixed, and thus the safety valve additionally has an electromagnetic shielding function, and can be used for overpressure control and electromagnetic radiation protection of an electromagnetic shielding body.

Description

technical field [0001] The invention relates to the field of valve devices and safety protection, in particular to a low-pressure electromagnetic shielding safety valve. Background technique [0002] Nowadays, the overpressure exhaust valve is widely used in the fields of inflatable products and safety protection. When the system pressure exceeds the specified value, the safety valve will be opened to remove excess air to ensure the safety of the system. The basic principle is to control the opening and closing of the valve plate through the overpressure of the gas inside the valve body and the spring. At present, the common structures of safety valves are lever type and spring type. The lever type safety valve is based on the principle of leverage. The gravity moment of the weight is applied to the valve disc through the lever and valve stem to balance the internal force acting on the valve disc. Its opening pressure is adjusted by moving the position of the weight (or cha...

AI Technical Summary

Problems solved by technology

However, the lever type is relatively bulky, sensitive to vibration, and requires a higher installation position; the spring type is sensitive, but due to the pressure of the spring itself, the pressure it can control is generally above the KPa level, and for smaller pressure environments. not applicable

[0003] The document with the application number 201420715183.0 discloses a low-voltage magnetic control safety valve, which uses rubber magnetic strips and flexible membrane materials as the main materials, and the opening pressure is 150Pa to 500Pa. However, the flexible material is easy to deform after being folded, and it is easy to deform when it is in the open state for a long time.

[0004] At present, domestic exhaust valves do not have electromagnetic shielding performance when they are open. If they are used in an environment that requires electromagnetic shielding, there will be electromagnetic leakage in the installation and use of safety valves.

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