JP2002343206A - Diaphragm for pressure switch or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute to suppression of permeation of gas such as steam or oil mist and to contribute to prevent defective continuity or the like of a switch contact. SOLUTION: The diaphragm 5 is a layer structure with an aluminum film 12 attached between body films 10 and 11, a comprising for example, fluororubber or nitrile rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a diaphragm used for a pressure switch or the like.

[0002]

Conventionally, a diaphragm used for a pressure switch or a position switch has a structure in which a polyimide film or a PET (polyethylene terephthalate) film is mounted on a rubber main body film for reinforcement. I have. However, in this conventional device, gas such as water vapor or oil mist may permeate the diaphragm at a high temperature, and there is a problem that a conduction failure of a switch contact is caused.

[0003] The present invention has been made in view of the above circumstances, and an object thereof is to provide a pressure switch which can suppress gas permeation even at a high temperature and does not cause conduction failure of switch contacts and the like. And the like.

[0004]

The invention according to claim 1 is characterized in that a diaphragm used for a pressure switch or the like has a layer structure of a rubber main body film and an aluminum film. In this case, the permeation of gas such as water vapor and oil mist can be suppressed, which can contribute to the prevention of poor conduction of the switch contacts. In this case, an aluminum film may be mounted between the two main films. By doing so, the flexibility and sealing properties are improved, and the aluminum film can be protected from both sides, resulting in excellent durability.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 4 shows the entire configuration of the pressure switch 1. In the pressure switch 1, for example, when the supply pressure of the lubricating oil exceeds a certain value, the contact is turned off. Specifically, a reference pressure chamber 3 and a pressure inflow chamber 4 are formed in the switch body 2, and these two chambers 3, 4 are partitioned by a diaphragm 5. A movable contact member 6 is attached to the diaphragm 5 at the center thereof together with a spring seat 7. The movable contact member 6 is urged toward the pressure inflow chamber 4 by a spring 7 a provided in the reference pressure chamber 3. ing.

A fixed contact member 8 is attached to the pressure inflow chamber 4 at a position facing the movable contact member 6. Normally, the movable contact member 6 comes into contact (conduction) with the fixed contact member 8.

As shown in FIG. 1, a hole 9 for fitting the movable contact member 6 is formed in the center of the diaphragm 5 and the inner peripheral edge thereof is formed to be slightly thick. The outer peripheral portion is also formed to have a thick wall and an almost elliptical cross section, and the middle portion thereof is thin. The diaphragm 5 has an aluminum film 12 between main body films 10 and 11 made of, for example, fluorine rubber or nitrile rubber.
Has a layered structure where it has been mounted.

In this case, the diaphragm 5 is manufactured according to the following procedure. First, as shown in FIG. 3, an aluminum vapor-deposited layer 1
4 to form an aluminum film 12, and a sheet-shaped body film 1
The diaphragm sheets 15 (see FIG. 3) are manufactured by attaching the layers 0 and 11 by, for example, bonding, and the diaphragm sheet 15 is formed into a diaphragm 5 by hot press molding.
Punch while forming.

In the pressure switch 1 having the above configuration, when the pressure of the lubricating oil supplied to the pressure inflow chamber 4 increases, the diaphragm 5 swells and deforms toward the reference pressure chamber 3, and the movable contact member 6 becomes the fixed contact member 8. And is switched off.

Here, the diaphragm 5 having the above-described structure has a layered structure of the main body films 10, 11 made of rubber and the aluminum film 12, so that permeation of gas such as water vapor or oil mist can be suppressed, and the switch can be switched. It can contribute to prevention of conduction failure of the contact. Incidentally, according to the present embodiment, the gas permeability was reduced to about 1/50 as compared with the conventional example.

In this case, since the aluminum film 12 is mounted between the two main body films 10 and 11, the flexibility and the sealing property are improved, and the aluminum film 12 can be protected from both sides and the durability is excellent. It will be. Note that a configuration in which an aluminum sheet is attached to only one surface of one main body film may be adopted. Further, the diaphragm of the present invention can be applied to a diaphragm of a position switch in addition to the pressure switch.

[0012]

As apparent from the above description, the present invention has an excellent effect that gas permeation can be suppressed even at a high temperature, and the occurrence of poor connection at the switch contact can be prevented. Obtainable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a diaphragm showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of an aluminum sheet.

FIG. 3 is a longitudinal sectional side view of a diaphragm sheet.

FIG. 4 is a longitudinal sectional side view of a pressure switch.

[Explanation of symbols]

1 is a pressure switch, 3 is a reference pressure chamber, 4 is a pressure inflow chamber,
Reference numeral 5 denotes a diaphragm, 6 denotes a movable contact member, 8 denotes a fixed contact member, 10 and 11 denote a main body film, and 12 denotes an aluminum film.

Claims (2)

[Claims] 1. A diaphragm for use in a pressure switch or the like, wherein the diaphragm has a layered structure of a rubber main body film and an aluminum film. 2. The diaphragm according to claim 1, wherein an aluminum film is mounted between the two main membranes.