JPS6294533U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a differential pressure switch which is an embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. 1. FIG. 3 is a perspective view showing the vicinity of the reed switch and permanent magnet in the differential pressure switch. FIG. 4 is a front sectional view showing a differential pressure switch which is another embodiment of the present invention. FIG. 5 is a perspective view of the differential pressure switch corresponding to FIG. 3. FIG. 6 is a front sectional view showing the main parts of a differential pressure switch which is still another embodiment of the present invention. 10: Housing, 14, 20: Port, 26
: Piston, 28: Compression coil spring, 30
: Spring retainer, 34: Pipe, 38: Reed switch, 48: Permanent magnet, 50: Spring retainer, 54: Bellows, 60: Permanent magnet, 6
2: Magnetic shielding plate.

Claims (1)

[Claims for Utility Model Registration] (1) A housing, a pressure receiving member movably provided within the housing and operated by receiving fluid pressure on at least one pressure receiving surface; a spring that applies an elastic force in the opposite direction to the operating force based on the fluid pressure; a reed switch fixed to the housing; a permanent magnet disposed close to the reed switch; Converting it into a variation in the magnetic force of the permanent magnet with respect to the reed switch,
A pressure switch comprising: a conversion means for opening and closing the reed switch; and a pressure switch. (2) The pressure switch according to claim 1, wherein the reed switch is housed in a tube made of a non-magnetic material and fixed to the housing. (3) A utility model registration request in which the tubular body abuts a spring retainer that supports the end of the spring on the side that applies elastic force to the pressure receiving member, and also serves as a stopper that defines the movement limit of the spring retainer. The pressure switch according to range 2. (4) At least a part of the spring retainer is the permanent magnet, and the converting means is configured to change the distance between the permanent magnet and the reed switch.
Pressure switch as described in section. (5) The above-mentioned pressure-receiving member is adapted to receive fluid pressure from a pressure-receiving surface facing opposite to the above-mentioned pressure-receiving surface, and is actuated by the differential pressure between the two fluid pressures. The pressure switch according to any of paragraph 4. (6) A bellow is disposed on the opposite side of the spring retainer from the side that receives the spring, and one end of the bellow is hermetically fixed to the spring retainer and the other end to the housing, so that the bellows High-pressure fluid pressure is applied to the inside, and low-pressure fluid pressure is applied to the space around the bellows and spring retainer.
The pressure switch according to any one of claims 3 to 5, wherein a part of the spring retainer functions as the pressure receiving member. (7) Both the reed switch and the permanent magnet are fixed to the housing, and the converting means moves integrally with the pressure receiving member,
The pressure according to claim 1 or 2 of the utility model registration claim, which includes a magnetic shielding member that moves between a shielding position interposed between a reed switch and a permanent magnet and a retracted position emerging from between them. Switch.