JP2540648Y2 - pressure switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure switch for sensing a change in pressure of a fluid, and more particularly to a pressure switch which can be used for a high-pressure liquid.

[0002]

2. Description of the Related Art In general, there are a diaphragm switch, a bellows switch, a Bourdon tube switch, and the like as a pressure switch for sensing a change in pressure of a fluid. The switch of the switch unit is operated by the stroke of the center part. In addition, the bellows type operates the switch of the switch unit by the stroke of the bellows that expands and contracts due to the change in the pressure of the fluid. The switch of the section is operated.

[0003]

However, the prior art has the following problems. The diaphragm type and the bellows type cannot be used for a high-pressure fluid because they do not react to a pressure change at a high pressure due to the structure of the diaphragm or the bellows. Further, since there is no function of increasing the stroke for operating the switch of the switch unit, it is impossible to cope with a delicate pressure change. Therefore, the range of use is limited. On the other hand, the Bourdon tube type is resistant to high pressure, has a function of expanding a stroke, and has high performance, but has a complicated structure and is expensive. Further, since the fluid flows inside the Bourdon tube, the Bourdon tube is liable to be permanently deformed due to the excessive pressure of the fluid, so that the operation point of the switch changes and the switch does not operate normally at the set value.

The present invention has been made in view of the above problems, and can be used for high-pressure fluids, can cope with minute pressure changes, is resistant to excessive pressure, is simple and inexpensive in structure, and has high performance. It is to provide a pressure switch.

[0005]

According to the present invention, there is provided a pressure switch for sensing a change in the pressure of a fluid, wherein the pressure switch for sensing a change in the pressure of the fluid includes a case having a fluid introduction portion; Installed in the fluid inlet
And the pressure of the fluid introduced into the fluid inlet changes.
A columnar elastic member that is compressed and deformed, and formed on the elastic member.
Piston inserted into the bottomed hole and the front of this piston
The elastic member is formed at a portion to be inserted into the bottomed hole,
When the compression deformation of the elastic member is performed,
Tapered part that converts to pushing force along the axial direction of the ton
And the pipe pushed out by compression deformation of the elastic member.
A switch that is opened and closed by a stone, and this switch
Between the elastic member and the piston
Transmits the pressing force of the issued piston to the switch unit
The pressure switch is characterized by comprising an urging means . The case includes a main body provided with the piston.
(1a) and a cap portion provided with the switch portion
And the mounting position of the cap portion with respect to the main body.
The piston and the switching unit by changing the
It is preferable to provide an adjusting means for adjusting the distance .

[0006]

[Operation] According to the present invention, when the fluid pressure changes,
The columnar elastic member is compressed and deformed.
Is converted into an extruding force along the axial direction by the taper
Move the ston in the axial direction. The switch is operated by the displacement caused by the movement of the piston. As described above, since the change in the pressure of the fluid is converted by the elastic member and the piston to operate the switch, the switch can be used for a high-pressure fluid and can cope with a delicate pressure change.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken side view of the pressure switch, and FIG.
FIG. 3 is a sectional view of a pressure switch. As shown in FIGS. 1 and 2, the pressure switch A includes a sensing operation unit B that operates by sensing a change in the pressure of the liquid in the case 1, and the sensing operation unit B
And a switch section C that is activated by an operation displacement of
The sensing operation section B is provided with an elastic member 2 that is deformed by a change in the pressure of the liquid, and includes an operating member 3 that is operated by the elastic member 2 in the axial direction. Further, the operating member 3 is provided in the switch section C.
The switch 4 is operated by the displacement of the switch. And
An adjustment mechanism D for adjusting the operation point of the switch 4 is provided on the sensing operation section B side.

The case 1 has a substantially cylindrical shape, and has a main body 1 on the lower side.
a and a cap 1b on the upper side, and long screw portions 21 and 22 for screwing the main body 1a and the cap 1b are formed on the main body 1a and the cap 1b, respectively. An elastic member 2 and an operating member 3 are provided on the main body 1a side, and a switch 4 is provided on the cap 1b side.

The elastic member 2 is made of rubber having a substantially T-shaped cross section and comprises a lower substantially cylindrical portion 2a and an upper substantially disk portion 2b.
Substantially and liquid introduction holes 1c and communicating with form feedthrough <br/> the main body 1a of the case 1 on the outer circumference of the cylindrical portion 2a, the fluid fluid is introduced
A space portion 1d as an introduction portion is formed. Further, the axis of the elastic member 2 is moved from the substantially disk portion 2b to the substantially cylindrical portion 2a.
To form a hole 2c or notch with a bottom .

The operating member 3 includes a piston 5 inserted into the hole 2c of the elastic member 2 and a rod 6 operated by the piston 5.
And a push button 7 which comes into contact with the switch 4. A spring 8 as urging means is interposed between the push button 7 and the rod 6. Piston 5 inserted into hole 2c
The contraction force of the elastic member 2 is
The taper that converts to the pushing force in the direction
It is formed. The rod 6 is a cylindrical body having a substantially stair-shaped cross section and is slidable in the vertical direction by being fitted in a guide 9 having a substantially cylindrical shape, and is constantly urged downward by a return spring 10. The return spring 10 has one end attached to the cap portion 1b and the other end attached to the rod 6, and is provided between the cap portion 1b and the rod 6 in a contracted state. The push button 7 is provided with a snap reversing plate 11, and when a predetermined amount of force is applied, the snap reversing plate 11 is instantaneously reversed to quickly raise and lower the push button 7. The snap inversion plate 11 has a substantially circular shape and has an end attached to a lower end of the electrode assembling tool 12.

The switch 4 comprises a movable contact 13 and a fixed contact 14. When the push button 7 contacts the movable contact 13 and pushes the movable contact 13, the movable contact 13 is fixed.
4 and is closed (the switch is ON).
Further, since the movable contact 13 is in the form of a leaf spring, when the push button 7 returns, the movable contact 13 is opened (the switch is turned off by the restoring force of the leaf spring).
FF state).

The adjusting mechanism D includes screw portions 21 and 22 formed on the main body 1a and the cap 1b. The adjusting mechanism D adjusts the length of the screw portion 22 of the cap 1b to be screwed to the screw portion 21 of the main body 1a. The distance of the push button 7, ie the rod 6
The pressing force on the push button 7 according to the movement amount of the button is adjusted. Therefore, if the cap portion 1b is brought closer to the main body 1a by lengthening the screwing portions of the screw portions 21 and 22, the switch 4 can be operated even when the movement amount of the rod 6 is small (that is, the pressure change of the liquid is small). Can be. Also, the screw portion 21,
If the cap portion 1b is separated from the main body 1a by shortening the threaded portion of 22, the switch 4 can be operated when the movement amount of the rod 6 is large (that is, the pressure change of the liquid is large). In this manner, the range and pressure value of the pressure change of the liquid for operating the switch 4 can be adjusted. The adjustment mechanism D can also absorb an assembly error between the operation member 3 of the sensing operation section B and the switch 4 of the switch section C.

Next, the operation and operation of the pressure switch A will be described. First, a liquid pipe is connected to the liquid inlet 1c to introduce the liquid into the space 1d. When the pressure of the liquid increases, the elastic member 2 contracts from the outer periphery toward the center, and moves the piston 5 upward in the axial direction. The rod 6 moves upward against the return spring 10 by the movement of the piston 5,
The push button 7 is pressed via the spring 8. When the push button 7 is pressed, the snap reversing plate 11 is instantaneously reversed and the push button 7 is moved upward, and the movable contact 13 is moved to the fixed contact 1.
Touch 4 As a result, the switch 4 is closed (the switch is ON). When the pressure of the liquid drops, the elastic member 2 is restored, and the rod 6 and the piston 5 are moved downward by the urging force of the return spring 10, and the push button 7 is moved downward via the spring 8. By this movement, the snap inversion plate 11 is instantaneously restored, the push button 7 is separated from the movable contact, and the movable contact 13 is separated from the fixed contact 14. Thus, the switch 4 is opened (the switch is OFF).

[0014]

[Effects of the Invention] The present invention is configured as described above, and has the following effects. Since the pressure of the fluid is sensed by the elastic member that compresses and deforms, it can cope with pressure changes at high pressure and can be used for high-pressure fluid. Further, since the compression deformation of the elastic member is converted into the axial movement by the piston, it is possible to cope with a delicate pressure change. Therefore, the range of use is not limited. Since the switch is operated by the elastic member and the piston , the structure is simplified and the cost can be reduced. Further, since there is no need to flow a fluid inside the tube as in the case of the Bourdon tube, there is no permanent deformation and the operating point does not change. As described above, the performance can be improved.

An apparatus provided with an adjusting mechanism for adjusting the operating point of the switch on the sensing operation section side can change the operating point and can be used in a wide range. Further, an error due to assembly or the like can be adjusted.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a pressure switch according to an embodiment of the present invention.

FIG. 2 is a sectional view of the pressure switch according to the embodiment of the present invention;

[Explanation of symbols]

 A: Pressure switch B: Sensing operation part C: Switch part D: Adjustment mechanism 1: Case 1a: Main body 1b: Cap 1c: Liquid introduction hole 1d: Space part 2: Elastic member 2a: Substantially cylindrical part 2b: Substantially disk part 2c : Hole 3: Operating member 4: Switch 5: Piston 6: Rod 7: Push button 8: Spring 9: Guide 10: Return spring 11: Snap reversing plate 12: Electrode assembly 13: Movable contact 14: Fixed contact

Claims (2)

(57) [Scope of request for utility model registration] 1. A pressure switch for sensing a change in pressure of a fluid, wherein a case (1) having a fluid introduction portion (1d) is provided on the fluid introduction portion, and is introduced into the fluid introduction portion.
Columnar elastic member that compresses and deforms due to the pressure change of a damaged fluid
(2) and inserted into the bottomed hole (2c) formed in the elastic member.
A piston (5) and a portion formed in the piston to be inserted into the bottomed hole.
When the elastic member (2) is compressed and deformed,
Pushing the compression deformation of the member along the axial direction of the piston
A taper portion that converts the force into an output force, and the piston that is pushed out by compression deformation of the elastic member.
A switch section (C) opened and closed by a switch, and interposed between the switch section and the piston,
The pressing force of the piston pushed out of the conductive member
And a biasing means (8) for transmitting the pressure to the switch. 2. The case, wherein the case is provided with the piston.
Body (1a), and a cap provided with the switch unit.
(1b), and the cap for the main body.
By changing the mounting position of the
The pressure switch according to claim 1 , further comprising adjusting means for adjusting a distance from the piston .