Sealing structure of pressure gauge

Abstract

The invention discloses a sealing structure of a pressure gauge, which comprises an upper cover and a rear cover, wherein the contact surface of the upper cover and the rear cover is provided with an adhesive sealing layer or fixed sealing is carried out through ultrasonic welding, the joint between the upper cover and the rear cover can be completely sealed through the adhesive sealing layer, or the contact surface of the upper cover and the rear cover are welded into a whole through ultrasonic welding, the situation that a gap at the joint of the upper cover and the rear cover influences the sealing performance of the pressure gauge is avoided, the upper cover is provided with a key groove, an upper cover opening and a sealing groove arranged around the upper cover opening, the upper cover is further provided with a key assembly and a liquid crystal screen, the key assembly comprises keys, a connecting strip and an O-shaped ring, the O-shaped ring is embedded into the sealing groove and extrudes the liquid crystal screen, due to the fact that the O-shaped ring has elasticity, the liquid crystal screen and the sealing groove can be well sealed, the keys are embedded into the key grooves, the contact surfaces of the keys and the key grooves are provided with the adhesive sealing layer, or the keys and the key grooves are subjected to secondary injection molding, and the situation that the sealing performance is affected due to the existence of the gap can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of pressure gauges, in particular to a sealing structure of pressure gauges. Background technique [0002] At present, the most commonly used pressure gauge usually adopts the traditional mechanical pointer pressure gauge. The working principle of the mechanical pointer pressure gauge in the prior art is that the metal pressure diaphragm is deformed, and the pointer is converted into a visible pressure value. The disadvantage of the mechanical pointer pressure gauge is that the mechanical strength of the mechanical pointer will gradually decrease after a period of use, resulting in inaccurate measurement accuracy during later use. Due to the pointer scale display, the error of visual value is large due to different observation angles. Mechanical pointer pressure gauges can only display measurement data in one unit. The application scenario is relatively simple. Moreover, the existing pressure gauge has po...

AI Technical Summary

Problems solved by technology

[0004]The purpose of the present invention is to solve the poor sealing of the existing pressure gauge, and the opening and closing of the pressure gauge is controlled by buttons, which is prone to unexpected situations such as false touch Problems that prevent the pressure gauge circuit from working properly

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