JPH0329862Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a pressure switch having multiple switch functions.

"Prior Art" Conventional switches have only one switch operation per switch operation part, so
For example, in order to perform a pressure switch that performs two or three operations, multiple switch mechanisms are required, and as a result, the entire pressure switch becomes larger and has a large number of parts, making it extremely difficult to make it smaller and lighter. It was hot.

``Problems to be solved by the invention'' In view of the above-mentioned drawbacks, the purpose of the present invention is to enable multiple switch operations to be performed with one switch operation part, and to perform multiple switch operations in response to pressure changes. That is.

``Means for Solving the Problems'' The configuration of the present invention is to sandwich the peripheral edge portion between the upper body and the lower body with the metal diaphragm on the upper side and the tilting spring on the lower side, so that the metal diaphragm is placed above the diaphragm. A pressure receiving chamber is provided, a substantially triangular movable piece is fixed to the lower center surface of this tilting spring, a movable contact is attached to each corner of the movable piece, and a fixed contact that pairs with the movable contact is set at a height. The movable piece is attached to the bottom of the lower body in a height-adjustable manner from outside the body, and a spring is provided between the movable piece and the bottom of the lower body.

"Operation" By tilting the movable piece, each movable contact and each fixed contact provided on one movable piece are tilted while pushing down the movable piece, thereby performing a plurality of switch operations.

"Embodiment" To explain an embodiment of the present invention with reference to the drawings, between an upper body 2 and a lower body 3 having a pressure introduction port 1,
The peripheral edges of the metal diaphragm 4 and the tilting spring 5 are tightly connected, and the upper body 2 and lower body 3 are held together by a retaining ring 6.
A pressure receiving chamber 7 communicating with the pressure introduction port 1 is provided above the diaphragm. The tilting spring 5 is connected by a flexible connecting member 10 between a holding frame 8 on the outer periphery and a mounting portion 9 located in the center.
The mounting portion 9 has a function of being able to move up and down or tilt.

Reference numeral 11 denotes a movable piece fixed to the lower surface of the mounting portion 9, which has a substantially triangular shape and has a plurality of contacts at each corner, namely, a first movable contact 12, a second movable contact 13, and a third movable contact.
A movable contact 14 is provided on the same circumference from the center of the movable piece, and a recessed portion 15 is provided at the center of the movable piece.

16, 17, and 18 are screw holes 19, 19, respectively, which are located in the bottom of the lower body on a straight line passing through the first, second, and third movable contacts 12, 13, and 14;
19, first, second, and third fixed contacts made of a conductive material, having a curved surface portion 20 at the upper end, and provided with threads almost entirely; A terminal piece 22 is fixed to the lower end with a nut 23. 24 is a screw groove provided at the lower end of each fixed contact. Reference numeral 25 denotes a spring, which is resiliently applied between the bottom of the lower body and the movable piece 11, and the upper end of the spring is hooked into the recessed portion 15.

In the figure, A is the first movable contact 12 and the first fixed contact 1
6, B is the second movable contact 1
3 and a second fixed contact 17,
C is a third switch consisting of a third movable contact 14 and a third fixed contact 18. 26 is a seal packing.

Next, to explain the operation of this embodiment, when the pressure P entering from the pressure introduction port 1 is lower than the set pressure, the movable piece 11 is pushed upward by the spring 25, so all the switches are turned off.
It is OFF.

Next, the pressure inside the pressure receiving chamber 7 becomes the first set pressure P ₁
When it reaches , the movable piece 11 is pushed down through the diaphragm 4 and the tilting frame 5 and against the elastic force of the spring 25 while maintaining a substantially horizontal state, and is located at the uppermost position among the fixed contacts. The first movable contact 12 comes into contact with the first fixed contact 16, and the first switch A is turned on. In this case, the second and third
Switches B and C are still OFF.

Furthermore, when the pressure inside the pressure receiving chamber 7 further increases and reaches the second set pressure _P2 , the first movable contact 12 located at one end of the movable piece 11 switches to the first fixed contact 1.
6, the second and third movable contacts opposite to the first movable contact resist the spring 25 and are pushed down and tilted via the diaphragm 4 and the tilting spring 5. The second fixed contact 17, which is located at a slightly lower height than the first fixed contact 16, and the second movable contact 13 come into contact with each other, and the second switch B is also turned on. That is, the first and second switches A and B
is ON, and the third switch C is still OFF.

Furthermore, when the pressure inside the pressure receiving chamber 7 increases and reaches the third set pressure _P3 , the movable piece 11 causes the first and second movable contacts 12 and 13 to switch between the first and second fixed contacts 16 and 17.
, the other third movable contact 14 side is pushed down diagonally against the spring 25, and the third movable contact 14 and the third fixed contact 18 come into contact, and the third switch C is also turned on, and all switches are turned on. turns on.

Incidentally, since the mounting portion 9 to which the movable piece 11 is fixed is connected to the holding frame 8 by a flexible connecting member 10, this movable piece can be tilted and can also move up and down.

In this example, the case where the three switch functions operate in three stages according to changes in pressure has been explained, but it is of course possible to use two switch mechanisms, and furthermore, each fixed contact can be operated at the same height. If you do this, you can have three switch functions operating at the same time. Also, when the pressure decreases, the switch is turned off in the opposite order as described above.

Furthermore, even if single switches A, B, and C are set and operated in the order of A, B, and C due to changes in pressure, the order of the operating sets may change due to changes over time. In the case of the present application, even if a change occurs over time, the entire set will only shift, and the set order will not change.

"Effects of the invention" The invention as described above has the following effects.

Since a single switch mechanism can perform multiple switch operations, the number of parts can be reduced and the device can be made smaller and lighter.

By attaching a movable piece having a plurality of movable contacts to a tilting spring that can tilt and move up and down, and varying the height of the fixed contacts, the operating timing can be easily adjusted according to the pressure.

Since each fixed contact can be adjusted from the outside, it is also possible to adjust the activation timing later.

Since the structure is simple, failures are rare and durability can be significantly improved.

Even if the operation timing deviates over time, only the entire system deviates, and the order of operation set does not change, thereby preventing malfunctions.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an exploded perspective view of the whole partially cut away, Fig. 2 is a vertical sectional view of the whole, Fig. 3 is a bottom view of the same, and Fig. 4 is a tilted view. A plan view of the spring, and FIG. 5 is a wiring diagram of the switch. 2... Upper body, 3... Lower body, 4... Metal diaphragm, 5... Tilt spring, 11... Movable piece, 12, 13, 14... Movable contact, 16, 1
7, 18... fixed contact, 25... spring.

Claims (1)

[Scope of utility model registration request] A pressure receiving chamber is provided above the diaphragm by sandwiching the metal diaphragm on the upper side and the tilting spring on the lower side between the upper body and the lower body. A shaped movable piece is fixed, a movable contact is attached to each corner of the movable piece, and a fixed contact paired with this movable contact is set at a different height to the bottom of the lower body and the height is adjusted from outside the body. A pressure switch that can be attached to the body and springs between this movable piece and the bottom of the lower body.