JPS644210Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure-responsive switch, particularly to its housing structure and mounting structure.

Pressure-responsive switches, such as pressure-sensing switches for fluid pressure accumulators for automobiles, whose housings are made by joining two bodies have conventionally had one body made of metal and the other made of synthetic resin; The body is assembled by caulking means or the like, and the metal housing is sealed and screwed into a base body having a fluid passage using a threaded portion on the outer periphery of the metal housing so as to be able to withstand fluid pressure. For this reason, there is a drawback that the sealing member disposed between the fluid passage and the metal body is deformed and damaged when screwed in.

The purpose of the present invention is to provide a pressure responsive switch that can avoid the above-mentioned drawbacks, and in order to achieve this purpose, the present invention seals both the first and second bodies and abuts them on the outer periphery. They are connected by an outer case. The mounting portion is sealed with an O-ring and fitted into a hole in the wall of the fluid passage, and is engaged with a separate member to prevent removal. With this configuration, fluid pressure is received by this separate member, and there is also the advantage that there is no need to consider the strength of the material of the attachment part. The main idea will be explained below with reference to the figures.

In FIG. 1, a lower first body 1 and an upper second body 2 are integrally connected by an outer case 3 made of a metal plate as shown. The outer case 3 wraps around the outer circumferences of the flange portions 4 and 5 of both bodies, and connects both bodies 1 and 2. First body 1
has a through hole 6, and the second body 2 is hollow and has a stepped hole, and contains therein a pressure-responsive switch mechanism, which will be described below.

The diaphragm 7 is held with its peripheral beaded portion sandwiched between the contact surfaces of the body 1 and the guide 8a, and is sealed. The piston 8 is slidably fitted into the guide hole of the guide 8a, the inner end of the piston 8 contacts a movable contact 9, the movable contact 9 receives one end of a compression spring 10, and the other end of the spring 10 receives a retainer 11. Receive it at The retainer 11 is supported by an adjustment screw 12, and the adjustment screw 12 is screwed into a screw hole formed at the center of the upper end of the second body 2. The bent portions of the inner ends of the terminals 14 and 15 are positioned behind the movable contact 9, and the respective cut-out claws 16 and 17 are engaged with the upper end surface of the body 2, and the spring 10 is receive a reaction force. The second body 2 has holes in its upper end surface into which both terminals 14 and 15 are fitted and held, and both terminals 14 and 15 are fixed to the second body 2. The first body 1 is provided with an O-ring 19 for sealing on the lower side, which is fitted into an annular groove 20 on the outer peripheral surface.

In FIGS. 2 and 3, reference numeral 21 denotes a base body having a fluid passage 22 and an attachment port 23 communicating with the passage 22. The first body 1 of the pressure-responsive switch 24 is fitted into the mounting opening 23 while being sealed with an O-ring 19 as shown. A tapered collar 26 for locking is provided on the outer peripheral surface of the attachment port 23.
The connecting case 25 is made of synthetic resin, surrounds the outer periphery of the outer case 3 as shown in FIG. 2, and has two claws 27 facing inward at symmetrical positions. The connecting case 25 also has a flange 28 on the upper inner peripheral edge. To attach the switch 24 to the base 21,
Insert the lower body 1 into the mounting opening 23 of the base 1 from above, and then insert the connecting case 25 from above.
Attach it to the upper second body 2 so as to cover it as shown in the figure, and while expanding both claws 27 outward against their elasticity, slide the tapered back surface of the collar 26, and finally Engage the collar 26 as shown. Due to this engagement, the switch 24 and the base body 21 are firmly connected without using a screw structure.

In the state shown in FIG. 1, the movable contact 9 is connected to both terminals 14, 1
Since it is in contact with the bent portions at both ends of 5, both terminals are connected and an electric circuit is closed. When the pressure in the fluid circuit communicated with the through hole 6 increases, the diaphragm 7 responds and moves the movable contact 9 away from the bent portions of the inner ends of the terminals 14 and 15 via the piston 8, thereby blocking both terminals. In this way, fluid pressure-responsive opening and closing operations are performed.

As explained above, the pressure-responsive switch of the present invention is not connected by screwing the housing, but is connected to the base by pressure from the outside through the connection case, so it can achieve the purpose of not deforming the sealing member and damaging the seal. Further, the mounting operation to the base body is simple, and the overall assembly is simple and easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the switch of the present invention, FIG. 2 is a longitudinal sectional view showing its mounting structure, and FIG. 3 is a side view showing the mounted state. 1, 2...Body, 3...Outer case, 4,
5...Flange part, 6...Through hole, 7...Diaphragm, 8...Piston, 9...Movable contact, 11...
...Retainer, 12...Adjustment screw, 14, 15...
Terminal, 19... O-ring, 21... Basic, 21
...Aisle, 25...Connection case, 26...Brim,
27...Claw, 23...Mounting port, 28...Flange.

Claims (1)

[Scope of utility model registration request] a tubular first body 1, a cylindrical second body 2,
Annular flanges 4 and 5 formed on the outer periphery of one end of each body, an outer case 3 that brings both flanges 4 and 5 into contact and wraps and connects them from the outer periphery, and both bodies abut in the housing formed by both bodies 1 and 2. A diaphragm 7 is sandwiched and held between both bodies with its periphery sealed at a certain point, a switch mechanism interlocks with the diaphragm 7, a through hole 6 that communicates one side of the diaphragm to the outside of the housing, and a diaphragm 7 that surrounds the outer periphery of the outer case 3 and extends above it. A connecting case 25 having at least two claws 27 below the flange is provided on the inner peripheral edge of the housing. Lock the flange and attach the claw 27 to the base 2.
1 and the housing is engaged with the flange 26 of the base body 21.
Pressure-responsive switch held at .