JPH046112Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is installed on the high-pressure side of a refrigeration cycle such as an automobile cooling system, and is used when the pressure on the high-pressure side of the refrigeration cycle circuit abnormally increases or decreases. The present invention relates to a two-acting pressure switch which has the function of opening an electrical contact connected to a compressor.

[Prior art] A conventional two-action pressure switch is, for example,
As shown in Publication No. 61-127543, a diaphragm that is displaced in response to external pressure, an actuating body (piston) that is pushed by the diaphragm and displaced together with the diaphragm, and a disc spring that biases the actuating body toward the diaphragm. In addition, a reversing disk whose peripheral edge is pushed by the actuating body, and a rod that can move forward and backward with both ends in contact with the center of the reversing disk and the electric switch are provided, so that the pressure applied to the diaphragm is When the low pressure determined by the spring is reached, the electric switch pressed by the rod closes, and the pressure applied to the diaphragm further increases, and when the pressure inverts the reversing disc, the electric switch opens. It was becoming like that.

[Problems to be Solved by the Invention] In the conventional two-action pressure switch described above, the low pressure side pressure at which the electric switch operates is determined by the elastic force of the disc spring. However, since the elastic force of the spring varies from component to component, the low pressure side pressure at which the electric switch operates varies from pressure switch to pressure switch.

This invention eliminates such drawbacks of the conventional method,
It is an object of the present invention to provide a two-action pressure switch that does not cause variations in the pressure on the low pressure side at which the pressure switch operates.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the two-action pressure switch according to the present invention has a diaphragm that is displaced in response to external pressure, and an actuator that is pushed by the diaphragm and is displaced together with the diaphragm. a reversing disk whose peripheral edge is pushed by the actuating body; a rod having one end abutting the center of the reversing disk and movable back and forth in the axial direction; An electric switch formed on a leaf spring that abuts the other end of the rod, urging means for urging the actuating body toward the diaphragm, and urging force adjustment means for adjusting the urging force of the urging means. In the two-action pressure switch, the biasing means is a disc spring, and the biasing force adjusting means includes an auxiliary leaf spring that overlaps the disc spring and is juxtaposed in a different direction with respect to the leaf spring of the electric switch. , and an adjustment screw for pushing and deflecting the auxiliary leaf spring by an arbitrary amount.

[Function] When the pressure applied to the diaphragm exceeds the low pressure side pressure determined by the urging means, the electric switch pushed by the rod closes, but the urging force of the urging means is adjusted by the urging force adjusting means. Since it can be adjusted, the biasing force can be adjusted for each pressure switch to make the low pressure side pressure at which the electric switch operates constant.

[Embodiment] An embodiment of the present invention will be described based on FIGS. 1 to 3.

An annular sealing gasket 13 is installed in an upper housing 12 having a pressure introduction port 11 at the center of the upper surface, and a diaphragm 14 made of a flexible thin film that is displaced in response to external pressure and a locking ring body 15 are sandwiched between the lower housing 12 and the lower housing 12. The lower end of the upper housing 12 is caulked to the housing 16. This diaphragm 14
The peripheral edge of the diaphragm 14 is held between the upper housing 12 and the locking ring 15 to prevent the diaphragm 14 from shifting even if strong pressure is applied.
Terminal pieces 21 and 22 to which lead wires are connected are provided at the bottom of the lower housing 16, and a fixed contact 23 is attached to one terminal piece 21 at the innermost part of the lower housing 16. ,
The rear end of a leaf spring 25 having a movable contact 24 at its tip is connected to the other 24, and this fixed contact 23
An electric switch 26 is formed by the movable contact 24 and the movable contact 24 .

A dish-shaped actuating body 35 that is pushed by the diaphragm and displaced together with the diaphragm is provided in close contact with the diaphragm 14, and the actuating body 35 hooks the lower peripheral edge of the inversion disk 2 on the lower part of the inner wall surface. An annular hooking portion 36 is provided, and claw pieces 37 are provided protruding in the outer circumferential direction. Reference numeral 29 denotes a holder which is integrated with the actuating body 35 and holds the reversing disk 2. The holder 29 is formed by protruding the center part downward and providing the guide cylinder part 30, and by making the outer peripheral edge rise upward. A locking pawl 33 is formed by bending the upper end of the raised portion 32 toward the center. A claw piece 37 of the operating body 35 is engaged with this locking claw 33. Further, a portion approximately 1/2 radius from the center of the holder 29 projects upward to form an annular convex portion 34, which forms a fulcrum when the reversing disk 2 is reversed.

Further, a disk spring 7 is provided, which is a biasing means for urging the actuating body 35 toward the diaphragm 14 by having its outer peripheral edge hooked to the tip of the locking stepped portion 28 . A guide cylinder part 30 of the holder 29 is inserted into the through hole 38, and the lower end of the rod 40, which is inserted into the guide cylinder part 30 so as to be able to move up and down, comes into contact with the leaf spring 25. There is. The upper end of the rod is in contact with the lower surface of the reversing disk 2.

Further, a substantially J-shaped auxiliary leaf spring 43 as shown in FIG. An adjusting screw 44 is provided to adjust the position. The auxiliary leaf spring 43 is arranged in a direction 90 degrees different from that of the leaf spring 25 and in the same space as the leaf spring 25, and the biasing force against the actuating body 35 is adjusted by the auxiliary leaf spring 43 and the adjustment screw 44. A biasing force adjusting means is formed. In the diagram, 4
2 communicates with the pressure inlet 11 and connects to the upper housing 1
2 and a diaphragm 14.

Next, to explain the operation of this embodiment, when the pressure inside the pressure receiving chamber 42 increases, the diaphragm 14
The pressing force of the actuating body 35 is transmitted to the actuating body 35 via the reversing disk 2 and the holder 29 to the disc spring 7.
Press down. When the pressure in the pressure receiving chamber 42 reaches the low pressure side determined by the operating body 35 and the disc spring 7, the disc spring 7 is bent downward, and the lower end of the rod 40 pushes the leaf spring 25 downward, causing the electric Close the switch 26. If the magnitude of the low-pressure side pressure at which the electric switch 26 operates is not appropriate, the amount of deflection of the auxiliary leaf spring 43 can be adjusted appropriately by rotating the adjustment screw 44. The magnitude of the low-pressure side pressure at which the is activated can be adjusted to a predetermined value.

When the pressure within the pressure receiving chamber 42 further increases, a downward constriction load is applied to the periphery of the reversing disk 2 by the annular latching portion 36 of the actuating body 35, and as a result, the reversing disk 2 is reversed upward. Due to this reversing operation, the rod 40 is released from the pressing force exerted by the reversing disk 2, and the upper end of the rod 40 is moved toward the reversing disk 2 by the leaf spring 25.
The electrical switching section 26 is opened by rapidly rising until it comes into contact with the electrical switching section 26.

[Effects of the invention] According to the two-action pressure switch of the invention, the biasing force against the operating body can be arbitrarily adjusted by the biasing force adjusting means, so that the low pressure side pressure at which the electric switch operates can be adjusted. This has the excellent effect of keeping the operating pressure constant and preventing variations in operating pressure from one pressure switch to another.

In addition, by providing the auxiliary leaf spring in a different direction from the leaf spring of the electric switch, it was possible to place it in parallel with the electric switch, so there was almost no need to increase the special space to provide the biasing force adjustment means. Therefore, the device can be made small and compact, and since the electric switch can be placed in the innermost part of the device, it can be easily assembled.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of one embodiment of the present invention;
The figure is a sectional side view thereof, and FIG. 3 is a perspective view of the biasing force adjusting means. 2... Reversing disk, 7... Biasing means, 14... Diaphragm, 26... Electric switch, 35... Actuating body, 40... Rod, 43, 44... Biasing force adjustment means.

Claims (1)

[Scope of utility model registration request] A diaphragm that is displaced in response to external pressure, an actuating body that is pushed by the diaphragm and displaced together with the diaphragm, an inverting disk provided so that its peripheral edge is pushed by the actuating body, and the center of the inverting disk. a rod with one end abutting the rod and movable back and forth in the axial direction; an electric switch formed on a leaf spring abutting the other end of the rod; In a two-action pressure switch having a biasing means and a biasing force adjusting means for adjusting the biasing force of the biasing means, the biasing means is a disc spring, and the biasing force adjusting unit is arranged such that the biasing force adjusting unit overlaps the disc spring. A two-action pressure switch characterized in that it comprises an auxiliary leaf spring arranged in different directions with respect to the leaf spring of the electric switch, and an adjustment screw that pushes and deflects the auxiliary leaf spring by an arbitrary amount.