JPH0139378Y2 - - Google Patents

Description

[Detailed explanation of the idea] Application fields of this invention The present invention relates to an improvement in the structure of a pressure switch.

Prior Art Conventional pressure switches have had the disadvantage that when the pressure to be detected decreases, the contact pressure between the movable and fixed contacts of the switch also decreases, resulting in poor contact between the switch contacts due to external vibrations and the like. Furthermore, as shown in, for example, Japanese Utility Model Publication No. 52-30553, gas introduction holes are provided in the insect pushing member with a circular cross section, and the head of the insect member is often made of a round shape. There was a problem that the head easily blocked the gas introduction hole.

Purpose of the present invention In view of the above-mentioned problems, the present invention provides a diaphragm in the fitting part where the switch body having the pressure detection hole and the switch part having the fixed contact and the movable contact fit together, and also incorporates it into the switch body. The object of the present invention is to provide a pressure switch which solves the above problems by providing a hole and fixing a flat worm pushing member to the introduction hole.

One Embodiment of the Present Invention An embodiment of the pressure switch according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of the pressure switch of the present invention. Reference numeral 1 denotes a pressure detection opening, which is provided at one end of the switch body 5. Reference numeral 2 denotes a female screw, which is formed on the inner wall of the opening 1 and is connected to an external device. Examples of external devices include air valves for automobile tires and refrigerant charge valves for refrigeration equipment. Reference numeral 3 denotes a bug pushing member, which presses the bug (core) of the air valve or charge valve. 4 is an O-ring. Reference numeral 6 denotes a diaphragm, which is held between the fitting portion of the switch body 5 and the switch portion 11 via a gasket 7. 8 is a piston, and diaphragm 6
contacts the diaphragm 6 within the pressure chamber formed in the switch portion 11. A movable contact 9 is brought into contact with a part of the piston 8. A fixed contact 10 is fixed at a position facing the movable contact 9 within the pressure chamber. 12 is a spring, and a piston 8
Press against the spring force.

FIGS. 2 and 3 show a cross-sectional view and a front view of the switch body 5 in which the worm pushing member 3 is fixed to the switch body 5 by caulking. The worm pushing member 3 has a rectangular cross section and is inserted into a pressure introduction hole 13 provided in the opening 1. The worm pushing member 3 has a shoulder portion 30 at one end and comes into contact with the switch body 5. The other end of the insect pushing member 3 has a leg portion 32, which fixes the insect pressing member 3 by opening at a predetermined angle.

Operation of the present invention When an air valve, for example, is connected to the opening 1,
The tip of the air valve comes into contact with the bug pushing member 3.
The worm pushing member 3 presses the worm (core) of the air valve and introduces pressurized air into the diaphragm 6 through the pressure introduction hole 13. The diaphragm 6 is displaced by air pressure and pushes down the piston 8 in its axial direction. The piston 8 moves while resisting the spring force of the spring 12, and brings the movable contact 9, which is in contact with the piston 8, into contact with the fixed contact 10. The movable contact 9 and the fixed contact 10 are in contact with each other with a pressure equal to the difference between the pressure of the diaphragm 6 and the spring force of the spring 12.

Effects of the present invention The pressure switch according to the present invention has a diaphragm at the fitting part between the switch body and the switch part, and the detected pressure is received by the entire effective area of this diaphragm. Even if the difference in spring force decreases, a predetermined amount of contact pressure is applied to the movable and fixed contacts of the switch, and this is a practical feature that prevents poor contact between the contacts even when exposed to external vibrations. It becomes possible to provide a high value pressure switch. Furthermore, when the insect pushing member presses the insect member and gas is introduced into the switch body, the gas introduction hole is not obstructed by the head of the insect member, and the introduced gas flows through the gas introduction holes on both sides of the insect pushing member. It is possible to provide a pressure switch that can be quickly introduced into the pressure switch through the space and has extremely reduced malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the present invention. 2 and 3 are a cross-sectional view and a front view of the worm pushing member shown in FIG. 1 in a crimped and fixed state. 1...Opening part, 2...Female screw, 3...Mushi pushing member, 4...O ring, 5...Switch body,
6...Diaphragm, 7...Putskin, 8...Piston, 9...Movable contact, 10...Fixed contact, 1
1...Switch part, 12...Spring.

Claims (1)

[Scope of utility model registration request] A switch body 5 having a pressure detection opening 1 at one end, a switch part 11 that fits into the other end of the switch body, and a switch part 11 that is held in the fitting part between the switch part and the switch body and is inserted into the switch part. A diaphragm 6 that forms a pressure chamber, a piston 8 that abuts the diaphragm in the pressure chamber of the switch section, a spring 12 that presses the piston against a spring force, and a spring 12 that abuts a part of the piston. In a pressure switch including a movable contact 9 and a fixed contact 10 fixed in a pressure chamber of the switch part, a female screw is provided in the inner wall of the opening part 1 of the switch main body 5, and the switch main body 5
A pressure switch characterized in that a circular pressure introduction hole 13 is provided at the other end, and a flat worm pushing member 3 having a shoulder portion 30 at one end and a leg portion 32 at the other end is provided in the pressure introduction hole.