JP6474282B2 - pressure switch - Google Patents

Description

  The present invention relates to a pressure switch.

Conventionally, this type of pressure switch is described in Patent Document 1 (Japanese Utility Model Publication No. 63-102142).
In the prior art, the switch operating member is moved in the vertical direction by the balance between the pressure receiving member mounted in the casing and the pressure setting spring, and the operating portion of one limit switch faces the switch operating member.

  Shokai 63-102142

By the way, when the pressure of the pressure fluid is detected by the pressure switch, it may be required to detect a plurality of set pressures.
In this case, in the prior art, since only one detected pressure can be obtained by the limit switch, it is necessary to arrange a plurality of pressure switches.
As a result, the installation space for the pressure switch increases and the installation cost also increases.
An object of the present invention is to reduce the installation cost by reducing the installation space of the pressure switch in providing a pressure switch capable of detecting a plurality of set pressures.

In order to achieve the above object, in the present invention, for example, as shown in FIGS. 1 to 2B or FIGS. 3A to 3C, a pressure switch is configured as follows.
A pressure receiving member 15 is inserted into the pressure receiving chamber 4 formed in the casing 1 so as to move up and down in a tight manner. The pressure receiving member 15 is pressed upward by the pressure fluid supplied to the pressure receiving chamber 4 and is biased downward by a pressure setting spring 20 mounted on the upper side of the pressure receiving chamber 4. A switch operating member 25 protrudes outward from the pressure receiving member 15 in the left-right direction. A plurality of first switches 30 and second switches 40 that are arranged side by side in the left-right direction face the switch operation member 25. A first operating rod 32 inserted into the switch operating member 25 so as to be movable up and down is biased by a spring 33 toward the first switch 30. A second operating rod 42 inserted into the switch operating member 25 so as to be movable up and down is biased by a spring 43 toward the second switch 40.

The present invention has the following effects.
When the pressure receiving member is moved in the vertical direction by a balance between an upward pressing force corresponding to the pressure in the pressure receiving chamber and a downward biasing force of the pressure setting spring, the pressure receiving member moves the switch operation member. The first operating rod and the second operating rod are moved via
When the pressure in the pressure receiving chamber exceeds a first set pressure set by a pressure setting spring, the first operating rod operates or stops operating the first switch. Further, when the pressure in the pressure receiving chamber is lower than the first set pressure, the first operating rod stops or operates the first switch.
Further, when the pressure in the pressure receiving chamber exceeds the second set pressure set by the pressure setting spring, the second operating rod operates or stops operating the second switch. Further, when the pressure in the pressure receiving chamber is lower than the second set pressure, the second operating rod stops or operates the second switch.
Thereby, said pressure switch can detect a some setting pressure. Further, as compared with the case where a plurality of pressure switches that can detect only one set pressure is installed as in the above-described prior art, the pressure switch of the present invention can reduce the installation space and the installation cost.

In the present invention, it is preferable to add the following configuration (1) or (2).
(1) For example, as shown in FIGS. 1 to 2B or FIGS. 3A to 3C, a first adjustment mechanism 35 that allows the first operation rod 32 to be advanced and retracted in the vertical direction is provided on the first operation rod 32. Provided.
In this case, when the pressure in the pressure receiving chamber reaches a desired pressure, the switch is operated by the first adjustment mechanism so that the first operating rod operates the operating portion of the first switch or stops operating. The height position or the vertical stroke of the first operating rod with respect to the operating member can be adjusted.

(2) For example, as shown in FIG. 1 to FIG. 2B or FIG. 3A to FIG. 3C, a second adjustment mechanism 45 that allows the second operation rod 42 to be advanced and retracted in the vertical direction is provided on the second operation rod 42 Provided.
In this case, when the pressure in the pressure receiving chamber reaches a desired pressure, the second adjustment mechanism switches the second operating rod so that the second operating rod operates or stops operating the operating portion of the second switch. The height position or the vertical stroke of the second operating rod relative to the operating member can be adjusted.

FIG. 1 shows a first embodiment of the present invention and is a cross-sectional view of a pressure switch. 2A and 2B are explanatory views of the operation of the pressure switch, and are partial views similar to FIG. 3A to 3C show a second embodiment of the present invention. FIG. 3A is a partial view similar to FIG. FIG. 3B is a partial view similar to FIG. 2A. FIG. 3C is a partial view similar to FIG. 2B.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 2B.
A pressure receiving chamber 4 and a spring chamber 8 are formed in order upward on the left side in the casing 1. A switch chamber 10 is formed on the right side in the casing 1.

  A pressure receiving member 15 is inserted into the pressure receiving chamber 4 so as to be movable in the vertical direction. The pressure receiving member 15 is pressed upward by pressure oil (pressure fluid) supplied to the pressure receiving chamber 4. A pressure setting spring 20 is attached to the spring chamber 8 via a spring receiver 19 and a switch operating member 25, and the pressure setting spring 20 biases the pressure receiving member 15 downward. The pressure setting spring 20 is pressed downward by a pressure adjusting screw 21 screwed to the upper end wall 1a of the casing 1 so as to be able to advance and retreat.

  A switch operating member 25 mounted on the pressure receiving member 15 is provided so as to project from the spring chamber 8 toward the switch chamber 10 through a through hole 26 formed in the right side wall of the spring chamber 8. The first switch 30 and the second switch 40 disposed toward the switch operation member 25 are sequentially disposed in the switch chamber 10 to the right. The first switch 30 and the second switch 40 are constituted by limit switches.

  Two mounting holes are formed in the right portion of the switch operation member 25 in a line with a predetermined interval in order to the right, and the cylindrical first guide member 31 and the second guide are respectively formed in the two mounting holes. The member 41 is fixed. The first operating rod 32 inserted into the inner peripheral hole of the first guide member 31 so as to be movable up and down is urged upward by a spring 33. The second operating rod 42 inserted in the inner peripheral hole of the second guide member 41 so as to be vertically movable is urged upward by the spring 43.

As shown in FIG. 1, a gap is formed between the upper end surface of the first operating rod 32 and the operating portion 30 a of the first switch 30 in a state where no oil pressure is applied to the pressure receiving chamber 4. A first adjustment mechanism 35 that adjusts the gap dimension is provided below the first operating rod 32. The first adjustment mechanism 35 is configured as follows.
An upper groove 36 and a lower groove 37 are formed in the lower portion of the first operating rod 32 in the circumferential direction with a predetermined interval in the height direction. A retaining ring 38 is attached to the lower groove 37, and the upward movement of the first operating rod 32 is restricted by the retaining ring 38. By mounting the retaining ring 38 in either the upper groove 36 or the lower groove 37, the gap size can be adjusted.

As shown in FIG. 1, a gap is formed between the upper end surface of the second operating rod 42 and the operating portion 40 a of the second switch 40 in a state where no oil pressure is applied to the pressure receiving chamber 4. A second adjustment mechanism 45 that adjusts the gap dimension is provided below the second operation rod 42. The second adjustment mechanism 45 is configured as follows.
An adjustment nut 49 is screwed into a male screw portion 48 formed in the lower portion of the second operation rod 42. The adjustment nut 49 restricts the upward movement of the second operating rod 42. The clearance dimension can be adjusted by tightening or loosening the adjusting nut 49.

As shown in FIGS. 1 to 2B, the pressure switch operates as follows.
In the initial state of FIG. 1, no pressure oil (pressure fluid) is supplied to the pressure receiving chamber 4, and the pressure setting spring 20 moves the switch operating member 25 and the pressure receiving member 15 downward. For this reason, the switch operating member 25 moves the first operating rod 32 downward via the first guide member 31 and the retaining ring 38, and the second via the second guide member 41 and the adjusting nut 49. The operation rod 42 is moved downward. At this time, the first operating rod 32 is spaced downward from the operating portion 30 a of the first switch 30. The second operating rod 42 is also spaced downward from the operating portion 40a of the second switch 40.

In the initial state of FIG. 1, when pressure oil is supplied to the pressure receiving chamber 4, first, the pressure oil in the pressure receiving chamber 4 pushes the pressure receiving member 15 upward against the pressure setting spring 20. When the pressure in the pressure receiving chamber 4 exceeds the first set pressure set by the urging force of the pressure setting spring 20, the pressure receiving member 15 moves the first operating rod 32 upward via the switch operating member 25. Then, as shown in FIG. 2A, the first operating rod 32 pushes the operating portion 30 a of the first switch 30. Accordingly, the pressure switch detects that the pressure in the pressure receiving chamber 4 has exceeded the first set pressure.
Subsequently, when the pressure of the pressure oil in the pressure receiving chamber 4 increases, the pressure setting spring 20 is further compressed, and when the oil pressure in the pressure receiving chamber exceeds the second set pressure set by the biasing force, The switch operation member 25 moves the second operation rod 42 upward. Then, as shown in FIG. 2B, the second operating rod 42 pushes in the operating portion 40a of the second switch 40. Thus, the pressure switch detects that the pressure in the pressure receiving chamber 4 has exceeded the second set pressure.
Finally, the switch operating member 25 comes into contact with the stepped portion 1c formed in the middle height portion of the spring chamber 8 from below.

In the state of FIG. 2B, when the pressure oil is discharged from the pressure receiving chamber 4, the pressure setting spring 20 moves the switch operating member 25 and the pressure receiving member 15 downward. However, the first operating rod 32 urged upward by the spring 33 continues to push the operating portion 30a of the first switch 30 and the second operating rod 42 urged upward by the spring 43 2 The operation part 40a of the switch 40 is pushed in and continues to be operated.
Next, when the oil pressure in the pressure receiving chamber 4 falls below the second set pressure, the switch operating rod 25 moves down the second operating rod 42 via the second guide member 41 and the adjusting nut 49 as shown in FIG. 2A. I will move to. Thereby, the operation part 40a of the 2nd switch 40 is open | released. As a result, the pressure switch can detect that the oil pressure in the pressure receiving chamber 4 is lower than the second set pressure.
Subsequently, when the oil pressure in the pressure receiving chamber 4 falls below the first set pressure, the switch operating rod 25 moves the first operating rod 32 through the first guide member 31 and the retaining ring 38 as shown in FIG. Move it down. Thereby, the operation part 30a of the 1st switch 30 is open | released. As a result, the pressure switch can detect that the pressure in the pressure receiving chamber 4 has fallen below the second set pressure.
Finally, the pressure receiving member 15 is received by the lower end wall 1 b of the casing 1.

The first embodiment described above has the following advantages.
When the pressure receiving member 15 is moved in the vertical direction by a balance between an upward pressing force corresponding to the oil pressure in the pressure receiving chamber 4 and a downward biasing force of the pressure setting spring 20, the pressure receiving member 15 is The first operating rod 32 and the second operating rod 42 are moved via the switch operating member 25.
When the oil pressure in the pressure receiving chamber 4 exceeds the first set pressure, the first operating rod 32 pushes the operating portion 30a of the first switch 30 to operate. Further, when the oil pressure in the pressure receiving chamber 4 falls below the first set pressure, the first operating rod 32 opens the operating portion 30 a of the first switch 30.
Further, when the oil pressure in the pressure receiving chamber 4 exceeds the second set pressure, the second operation rod 42 pushes in the operation portion 40a of the second switch 40 and operates it. Further, when the pressure in the pressure receiving chamber 4 falls below the second set pressure, the second operating rod 42 opens the operating portion 40 a of the second switch 40.
Thereby, said pressure switch can detect two set pressures, a 1st set pressure and a 2nd set pressure. Further, as compared with the case where a plurality of pressure switches that can detect only one set pressure is installed as in the above-described prior art, the pressure switch of the present invention can reduce the installation space and the installation cost.

3A to 3C show a second embodiment of the present invention. In the second embodiment, the same members (or similar members) as the constituent members of the first embodiment will be described with the same reference numerals in principle.
The second embodiment is different from the first embodiment as follows.

The first operating rod 32 inserted into the inner peripheral hole of the first guide member 31 so as to be movable up and down is urged downward by a spring 33.
Further, the second operation rod 42 inserted in the inner peripheral hole of the second guide member 41 so as to be vertically movable is urged downward by the spring 43.

Below the switch operating member 25, a first switch 30 and a second switch 40 are provided in order to the right outside of the spring chamber 8. The operation unit 30a of the first switch 30 and the operation unit 40a of the second switch 40 are opposed to the first operation rod 32 and the second operation rod 42 from the lower side, respectively.
Although the first switch 30 and the second switch 40 are exposed outside the casing 1, it is preferable to attach a cover to the first switch 30 and the second switch 40.

  As shown in FIG. 3A, in a state where no oil pressure is applied to the pressure receiving chamber 4, the first operation rod 32 pushes the operation portion 30a of the first switch 30 against the spring 33, and the first operation is performed. The rod 32 is moved upward with respect to the switch operating member 25. A first adjustment mechanism 35 is provided above the first operating rod 32. The first adjustment mechanism 35 includes a male screw portion 71 formed on the upper portion of the first operating rod 32 and an adjustment nut 72 screwed into the male screw portion 71. A gap is formed between the lower end surface of the adjustment nut 72 and the upper end surface of the first guide member 31. The dimension of the gap can be adjusted by tightening or loosening and rotating the adjusting nut 72.

  Further, as shown in FIG. 3A, in a state where no oil pressure is applied to the pressure receiving chamber 4, the second operating rod 42 pushes the operating portion 40a of the second switch 40 against the spring 43, and the first The two operating rods 42 are moved upward with respect to the switch operating member 25. A second adjustment mechanism 45 is provided above the second operation rod 42. The second adjustment mechanism 45 includes a male screw portion 48 formed on the upper portion of the second operation rod 42 and an adjustment nut 49 screwed into the male screw portion 48. A gap is formed between the lower end surface of the adjusting nut 49 and the upper end surface of the second guide member 41. The size of the gap can be adjusted by tightening or loosening and rotating the adjusting nut 49.

The pressure switch operates as follows as shown in FIGS. 3A to 3C.
In the initial state of FIG. 3A, pressure oil (pressure fluid) is not supplied to the pressure receiving chamber 4, and the pressure setting spring 20 moves the switch operating member 25 and the pressure receiving member 15 downward. Therefore, the switch operating member 25 pushes the first operating rod 32 against the spring 33 against the operating portion 30a of the first switch 30, and the second operating rod 42 against the spring 43. The operation unit 40a of the switch 40 is pushed in.

In the initial state of FIG. 3A, when pressure oil is supplied to the pressure receiving chamber 4, first, the pressure oil in the pressure receiving chamber 4 moves the pressure receiving member 15 upward against the pressure setting spring 20.
When the pressure in the pressure receiving chamber 4 exceeds the first set pressure set by the urging force of the pressure setting spring 20, the switch operating member 25 causes the first guide member 31 and the adjusting nut 72 to move as shown in FIG. 3B. The first operating rod 32 is lifted through. Thereby, the operation part 30a of the 1st switch 30 is open | released. As a result, the pressure switch can detect that the pressure in the pressure receiving chamber 4 has exceeded the first set pressure.
Subsequently, when the pressure of the pressure oil in the pressure receiving chamber 4 increases, the pressure setting spring 20 is further compressed, and when the pressure in the pressure receiving chamber 4 exceeds the second set pressure set by the urging force, FIG. As shown, the switch operating member 25 lifts the second operating rod 42 via the second guide member 41 and the adjusting nut 49. Thereby, the operation part 40a of the 2nd switch 40 is open | released. As a result, the pressure switch can detect that the pressure in the pressure receiving chamber 4 has exceeded the second set pressure.
Finally, the switch operating member 25 comes into contact with the step portion 1c formed at the middle height portion of the spring chamber 8 from below.

In the state of FIG. 3C, when the pressure oil in the pressure receiving chamber 4 is discharged, the pressure setting spring 20 moves the switch operating member 25 downward via the pressure receiving member 15.
When the pressure in the pressure receiving chamber 4 falls below the second set pressure, the second operating rod 42 pushes in the operating portion 40a of the second switch 40 as shown in FIG. 3B. Thereby, the pressure switch can detect that the pressure in the pressure receiving chamber 4 has fallen below the second set pressure.
Subsequently, when the pressure in the pressure receiving chamber 4 falls below the first set pressure, the first operating rod 32 pushes the operating portion 30a of the first switch 30 as shown in FIG. 3A. Thereby, the pressure switch can detect that the pressure in the pressure receiving chamber 4 has fallen below the first set pressure.
Finally, the pressure receiving member 15 is received by the lower end wall 1 b of the casing 1.

The second embodiment has the following advantages.
When the pressure receiving member 15 is moved in the vertical direction by a balance between an upward pressing force corresponding to the oil pressure in the pressure receiving chamber 4 and a downward biasing force of the pressure setting spring 20, the pressure receiving member 15 is The first operating rod 32 and the second operating rod 42 are moved via the switch operating member 25.
When the pressure in the pressure receiving chamber 4 exceeds the first set pressure, the first operating rod 32 opens the operating portion 30a of the first switch 30. Further, when the pressure in the pressure receiving chamber 4 is lower than the first set pressure, the first operating rod 32 pushes the operating portion 30a of the first switch 30 to operate.
Further, when the oil pressure in the pressure receiving chamber 4 exceeds the second set pressure, the second operating rod 42 opens the operating portion 40a of the second switch 40. Further, when the pressure in the pressure receiving chamber 4 falls below the second set pressure, the second operating rod 42 pushes in the operating portion 40a of the second switch 40 and operates it.
Thereby, said pressure switch can detect two set pressures, a 1st set pressure and a 2nd set pressure. Further, as compared with the case where a plurality of pressure switches that can detect only one set pressure is installed as in the above-described prior art, the pressure switch of the present invention can reduce the installation space and the installation cost.

Each of the above embodiments can be modified as follows.
Although two switches are exemplified in the pressure switch, three or more switches may be used.
The pressure switch may be disposed in a horizontal posture or in an oblique posture instead of being disposed in a vertical posture as illustrated.
The pressure fluid may be another liquid or a gas such as compressed air instead of the exemplified pressure oil.
In addition, it is needless to say that various modifications can be made within a range that can be assumed by those skilled in the art.

1: casing, 4: pressure receiving chamber, 15: pressure receiving member, 20: pressure setting spring, 25: switch operating member, 30: first switch, 32: first operating rod, 33: spring, 35: first adjusting mechanism, 40: second switch, 42: second operating rod, 43: spring, 45: second adjusting mechanism.

Claims (3)

A pressure receiving member (15) that is vertically movable and inserted in a pressure-tight manner in a pressure receiving chamber (4) formed in the casing (1), and is pressed upward by a pressure fluid supplied to the pressure receiving chamber (4) A pressure receiving member (15) biased downward by a pressure setting spring (20) mounted on the upper side of the pressure receiving chamber (4);
A switch operating member (25) projecting outward in the left-right direction from the pressure receiving member (15);
A first switch (30) and a second switch (40) which are provided side by side in the left-right direction and face the switch operating member (25);
A first operating rod (32) inserted into the switch operating member (25) so as to be vertically movable and biased by a spring (33) toward the first switch (30);
A second operating rod (42) that is inserted into the switch operating member (25) so as to be vertically movable and biased by a spring (43) toward the second switch (40).
A pressure switch characterized by that. The pressure switch of claim 1.
A first adjustment mechanism (35) that allows the first operation rod (32) to be advanced and retracted in the vertical direction is provided on the first operation rod (32).
A pressure switch characterized by that. The pressure switch of claim 1.
A second adjustment mechanism (45) that allows the second operation rod (42) to be advanced and retracted in the vertical direction is provided on the second operation rod (42).
A pressure switch characterized by that.

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