JPH06150792A - Pressure switch - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to provide a pressure switch that can handle positive pressure and negative pressure with a single pressure switch. [Composition] In a pressure switch that conducts or non-conducts an electric contact depending on a pressure from a pressure source, the pressure switch is disposed on both sides in the reciprocating direction of the pressure piston, and moves from the neutral position of the pressure piston to one direction and the other direction. First and second urging means for respectively generating urging forces that oppose movement, and first and second urging means disposed respectively between the pressure piston and the first and second urging means for receiving the forward force of the pressure piston. Two movable members and stoppers for locking the first and second movable members so that the pressure piston is disposed in the housing and the biasing force of the biasing means does not act on the pressure piston at the neutral position. Pressure switch

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure switch that opens and closes an electric contact according to a pressure from a pressure source.

[0002]

2. Description of the Related Art As a conventional pressure switch, an actual Kaisho 6
3-52238. This has a fixed contact that comes into contact with a moving contact that moves in conjunction with the movement of a diaphragm that changes according to the pressure from a pressure source and that is electrically connected to the moving contact. And a fixed contact are electrically connected or not electrically connected to each other.

[0003]

In the above-mentioned conventional technique, the contact is electrically conducted or not conducted depending on the negative pressure.

However, in the above-mentioned conventional pressure switch, if an attempt is made to make the pressure switch compatible with both positive pressure and negative pressure, two pressure switches are required, and the pressure switch itself becomes large and Could lead to a significant cost increase.

Therefore, the present invention provides a pressure switch capable of handling both positive pressure and negative pressure with a single pressure switch.

[0006]

[Constitution of the invention]

[0007]

The technical means taken in order to solve the above-mentioned technical problem is to reciprocate by pressure from a housing and a pressure source arranged in the housing to generate a positive pressure or a negative pressure. Equipped with a moving diaphragm, a pressure piston that reciprocates in the housing in conjunction with the reciprocating movement of the diaphragm, a movable contact that interlocks with the pressure piston, and a fixed contact that contacts the movable contact and is electrically conducted to the movable contact. In the pressure switch, the first and second urging means are provided on both sides in the reciprocating direction of the pressure piston and generate urging forces against the forward movement in one direction and the other direction from the neutral position of the pressure piston. And first and second movable members respectively arranged between the pressure piston and the first and second urging means for receiving the forward force of the pressure piston, and the pressure piston arranged in the housing. Emissions is that a stopper for each lock the first and second movable member as the biasing force of the biasing means is not applied to the pressure piston in the neutral position.

[0008]

The function of the present invention will be described. A double-acting member that is arranged so as to be able to double-act on both sides of the pressure piston in the displacement direction and that double-acts in the housing by the force that the pressure piston tries to shift; and a biasing means that constantly biases the double-acting member toward the pressure piston. And a stopper that limits the movement range of the double-acting member, and the pressure piston electrically connects or disconnects the movable contact and the fixed contact according to the positive pressure and the negative pressure,
Since the pressure from the pressure source can be positive pressure or negative pressure, a pressure switch that can handle both positive pressure and negative pressure can be made with a single pressure switch.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the pressure switch 1.
In the figure, the housing 10 of the pressure switch 1 includes a first housing 11, a second housing 12, and a third housing from the left in the figure.
It is composed of a housing 13 and a fourth housing 14,
Each is welded to form the housing 10 as a whole. Inside the housing 10, the diaphragm 2
It is divided into two rooms by 0, and the left side in the figure is the pressure chamber 30 and the right side in the figure is the atmosphere chamber 40.

The outer peripheral portion 20a of the diaphragm 20 is fixed to the housing 10, and the diaphragm 2 is provided at the center portion.
The pressure piston 50, which changes in response to the change of 0, is fixed. Further, a switch portion 60 that opens and closes according to the displacement of the pressure piston 50 is formed in the atmosphere chamber 40. or,
The pressure piston 50 includes a piston body 51 and a fixing member 52.
Are welded, and the inner peripheral portion 20b of the diaphragm 20 is fixed between the piston body 51 and the fixing member 52. Further, the movable members 70, 71 are provided at both ends of the pressure piston 50.
The movable members 70 and 71 are urged toward the pressure piston 50 by springs 80 and 81, respectively. Further, the moving range of the movable members 70 and 71 is the first
And the fourth housings 11 and 14, and the stopper portions 12a and 13a of the second and third housings 12 and 13, respectively. One ends of the springs 80 and 81 are supported by adjusting screws 90 and 91 to be adjustable to a predetermined strength.

The second housing 12 is provided with a port 12b connected to a pressure source (not shown).

The third housing 13 is provided with a communication hole 15 with the outside for keeping the atmospheric chamber 40 always at atmospheric pressure. A filter 16 for preventing foreign matter or the like from entering from outside is fixedly arranged in the communication hole 15 by a cap 17, and the cap 17 is provided with a passage 17a for allowing the communication hole 15 and the atmosphere to communicate with each other. .

Next, the switch section 60 will be described.
As shown in FIG. 1, the switch unit 60 includes a fixed contact 61 and a movable contact 62. This fixed contact 61
Is provided so that the contact portions 61a and 61b face each other,
Further, one end of the fixed contact 61 is bent at a right angle along the third housing 13, and this bent portion is fixed to the third housing 13 by a mounting screw 63. Also, the wiring 65 from the first terminal 64 of the two terminals provided in the third housing 13 is connected to the fixed contact 61 and soldered (not shown). As a result, the fixed contact 61 and the first terminal 64
Becomes electrically conductive. The movable contact 62 has a groove 51 a provided in the piston body 51 of the pressure piston 50.
, And is displaced integrally with the pressure piston 50. Further, one end of the movable contact 62 is bent in a U shape,
It has an elastic structure and is welded to the plate 62a. The plate 62 a is fixed to the third housing 13 by the mounting screw 66 like the fixed contact 61. Also, the wiring 65 is connected from a second terminal (not shown) provided in the third housing 13 to a hole (not shown) provided in the movable contact 62 and soldered. As a result, the movable contact 62 and the second terminal are electrically connected.

FIG. 2 is an operation diagram showing the operation of the pressure switch of this embodiment. The center line 100 shows a state where no pressure is applied to the pressure chamber 30, and the left side of the center line 100 is the negative pressure and the right side is. Positive pressure. Also, the upper line in the figure is electrically ON
A state is shown, and the lower line in the figure indicates an electrically OFF state.

Next, the operation will be described. In FIG. 1, when the pressure chamber 30 is not under pressure (the pressures of the atmosphere chamber 40 and the pressure chamber 30 are the same), the pressure piston 50 does not move, so that the movable contact 62 is the contact portion 61 a of the fixed contact 61.
Since it is located between 61b, it is in an electrically OFF state (position A in FIG. 2). When a negative pressure is applied to the pressure chamber 30 from the port 12b, the diaphragm 20 and the pressure piston 50 move to the pressure chamber 30 side, and when the pressure of the pressure chamber 30 reaches a predetermined pressure, the movable contact 62 causes the fixed contact 6 to move.
The contact point 61a of No. 1 is touched to be electrically turned on (FIG. 2).
B position inside). Next, when a positive pressure is applied to the pressure chamber 30 from the port 12b, the diaphragm 20 and the pressure piston 50
Moves to the atmosphere chamber 40 side, and when the pressure in the pressure chamber 30 reaches a predetermined pressure, the movable contact 62 comes into contact with the contact portion 61b of the fixed contact 61 to be electrically turned on (C in FIG. 2). Position of). Further, even if the positive pressure or the negative pressure is further increased from the state where the contact is touched and is electrically turned on, the movable contact 62 and the fixed contact 6 are
Since the first contact 61a or 61b remains in contact, it remains electrically ON.

The value (values of B and C in FIG. 2) at which the contacts come into contact and become electrically ON is set by the spring 8
The spring constants of 0 and 81 or the adjusting screws 90 and 91 are used.

[0018]

The effects of the present invention will be described. A housing and a diaphragm that is reciprocated by pressure from a pressure source that is disposed in the housing and that generates a positive pressure or a negative pressure;
In a pressure switch provided with a pressure piston that reciprocates in the housing in conjunction with the reciprocating movement of the diaphragm, a movable contact that interlocks with the pressure piston, and a fixed contact that contacts the movable contact and is electrically connected to the movable contact, First and second urging means which are provided on both sides of the reciprocating direction of the pressure piston and generate urging forces against the forward movement in one direction and the other direction from the neutral position of the pressure piston; The first and second movable members, which are respectively arranged between the first and second urging means and receive the forward force of the pressure piston, and the urging force of the urging means when the pressure piston is arranged in the housing and the pressure piston is in the neutral position. A pressure switch comprising: a stopper that locks each of the first and second movable members so that the pressure piston is not caught by the pressure piston. Possible pressure switch is, an increase in the size of the pressure switch itself in order to be in a pressure switch in the body, as well, it is possible to prevent the significant increase in cost.

[Brief description of drawings]

1 shows a cross-sectional view of a pressure switch according to the present invention.

FIG. 2 is a diagram showing the operating characteristics of the pressure switch according to the present invention.

[Explanation of symbols]

 1 ... Pressure switch 10 ... Housing 11 ... 1st housing 12 ... 2nd housing 12b ... Port 13 ... 3rd housing 14 ... 4th housing 16 ... Porous Filter 17 ... Cap 20 ... Diaphragm 30 ... Pressure chamber 40 ... Atmosphere chamber 50 ... Pressure piston 51 ... Piston body 51a ... Groove 52 ... Fixing member 60 ... Switch part 61 ... Fixed contact 61a, 61b ... Contact part 62 ... Movable contact 62a ... Plate part 64 ... First terminal 65 ... Wiring 70, 71 ... Movable member 80, 81 ... Spring 90, 91 ... Adjusting screw

Claims (1)

[Claims] 1. A housing, a diaphragm that is reciprocated by pressure from a pressure source that is disposed in the housing and that generates a positive pressure or a negative pressure, and a reciprocating motion in the housing in conjunction with the reciprocating motion of the diaphragm. A pressure piston, a movable contact that interlocks with the pressure piston, and a fixed contact that is in contact with the movable contact and is in electrical communication with the movable contact. First and second urging means that are arranged to generate urging forces that oppose forward movement in one direction and the other direction from the neutral position of the pressure piston, the pressure piston, and the first and second urging means. First and second movable members which are respectively disposed between the pressure piston and the forward force of the pressure piston and which receive the forward power of the pressure piston; Pressure switch, characterized in that the biasing force of the biasing means and a stopper for each locking said first and second movable members so as not placed on the pressure piston.