JP2518634Y2 - Relief valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a relief valve, and more particularly to a relief valve used when a large amount of flow is required.

[Prior art and problems to be solved]

The conventional relief valve is constructed as shown in FIG.

That is, this relief valve has a relief port 23 inside and a body 36 having a first opening 21 and a second opening 22 penetrating the inside and outside of the relief port 23 in a direction orthogonal to the relief port 23, and a first A valve 25 that is reciprocally mounted on the body 36 while penetrating the opening 21 and the second opening 22, and a diaphragm that is mounted on the body 36 and forms a positive pressure chamber 35 between the body 36 and the valve 25. 31 and the body 36, the diaphragm
A lid portion 30 that forms a negative pressure chamber 34 with the lid 31 and a spring 33 that is mounted between the lid portion 30 and the diaphragm 31 and biases the valve 25 in one direction.

A cylindrical standing portion 28 is integrally provided upright around the first opening portion 21 on the outer side of the body 36 so as to surround the first opening portion 21, and the standing portion 28 is partially raised. A hole 29 that communicates the inside and outside of the portion 28 is bored, and the positive pressure chamber 35 formed inside the standing portion 28 is opened to the atmosphere through the hole 29.

A disk-shaped diaphragm 31 and a bowl-shaped lid portion 30 are attached to the opening of the upright portion 28 in this order. The peripheral edge of the diaphragm 31 is an upright portion of the peripheral edge of the lid 30.
By caulking to the opening of 28, it is sandwiched and fixed between the peripheral edge of the lid 30 and the opening of the standing portion 28.

Then, the diaphragm 31 and the lid are provided at the opening of the upright portion 28.
By mounting the 30, a positive pressure chamber 35 is formed between the diaphragm 31 and the body 36, a negative pressure chamber 34 is formed between the diaphragm 31 and the lid portion 30, and the negative pressure chamber 34 is covered. A nipple that communicates the inside and outside of the negative pressure chamber 34 provided in the upper portion of the portion 30.
The pressure supply source (not shown) is connected via 37.

The valve 25 penetrates the first opening 21 and the second opening 22 and has one end connected to the center of the diaphragm 31 via the retainers 38 and 39 and the other end located in the relief port 23. It is composed of a shaft portion 26 and a disc-shaped valve portion 27 that is integrally provided at the other end of the shaft portion 26 and that opens and closes the second opening 22 from the inside of the body 36. In addition, 24 is a seal member that seals between the first opening portion 21 and the shaft portion 26.

A spring 33 is mounted between one surface of the diaphragm 31 and the lid portion 30, and the valve 25 is biased in one direction (the direction in which the valve portion 27 closes the second opening 22) by the biasing force of the spring 33. It is supposed to be done.

When a negative pressure is applied to the negative pressure chamber 34 from a pressure supply source (not shown) via the nipple 37 when the supercharging pressure reaches a certain value, the diaphragm 31 covers the urging force of the spring 33. The valve 25 is driven by following the displacement of the diaphragm 31 while being displaced in the direction of the portion 30, the valve portion 27 at the other end of the valve 25 opens the second opening portion 22, and the boost pressure is increased by the second opening portion. It flows into the relief port 23 via 22.

However, in the conventional relief valve configured as described above, the diaphragm 31 and the valve 25 are driven by applying a negative pressure to the negative pressure chamber 34, and
Since the opening 22 is opened, the diaphragm 31 and the valve 25 can be driven only to a position where the biasing force of the spring 33 and the negative pressure applied to the negative pressure chamber 34 are in equilibrium. Therefore, there has been a problem that a large amount of relief flow cannot be made to flow to the relief port 23 at once.

The present invention solves the above-mentioned problems of the conventional one, and an object thereof is to provide a relief valve capable of flowing a large amount of flow.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention has a body having a relief port inside and a first opening and a second opening penetrating inside and outside the relief port;
A diaphragm that is attached to the body and forms a negative pressure chamber with the body; a lid portion that is attached to the body and forms a positive pressure chamber with the diaphragm; (2) A shaft part having one end located inside the negative pressure chamber and the other end located outside the body, and a shaft part that is reciprocally mounted to the body while penetrating through the opening part and the other end of the shaft part. A valve portion that is provided and that opens and closes the second opening from the outside of the body, penetrates the center portion in the axial direction, and has one end communicating with the positive pressure chamber and the other end of the valve portion. A means having a valve having a hole communicating with the other surface side and a spring mounted between the diaphragm and the body for urging the valve in one direction is adopted.

[Action]

This invention adopts the above-mentioned means,
In the valve closed state, one surface of the valve portion of the valve comes into contact with the second opening from the outside of the body by the cooperation of the boost pressure acting on the other surface of the valve portion of the valve and the biasing force of the spring. , Block the relief port. Then, when a negative pressure is applied to the negative pressure chamber, the negative pressure and the supercharging pressure acting on the diaphragm from the positive pressure chamber through the hole in the center of the valve cause the valve portion of the valve to open the second opening. And the relief port is opened, part of the boost pressure also acts on one surface of the valve portion, the valve portion opens the second opening at once, and the relief port is opened at once. A large amount of relief flow flows into the relief port.

〔Example〕

Hereinafter, an embodiment of the present invention shown in the drawings will be described.

1 and 2 show an embodiment of a relief valve according to the present invention. The relief valve has a relief port 3 inside and the inside and outside of the relief port 3 are orthogonal to the relief port 3. Body having a first opening 1 and a second opening 2 penetrating in the direction
16, a valve 5 that is reciprocally mounted on the body 16 while penetrating the first opening 1 and the second opening 2, and a negative pressure chamber mounted on the body 16 and between the body 16 and the negative pressure chamber. 14
Is attached to the diaphragm 11 and the body 16 which are formed in the above, and the lid portion 10 which forms the positive pressure chamber 15 between the diaphragm 11 and the body, and is attached between the diaphragm 11 and the body 16, and the valve 5 is attached. And a spring 13 that biases in one direction.

A cylindrical standing portion 8 is integrally erected on the peripheral portion of the first opening 1 outside the body 16 so as to surround the first opening 12, and the standing portion 8 is partially erected. A nipple 9 that communicates the inside and outside of the portion 8 is integrally provided, and the negative pressure chamber 14 formed inside the upright portion 8 is connected to a pressure supply source (not shown) through the nipple 9. .

A disk-shaped diaphragm 11 and a bowl-shaped lid 10 are attached to the opening of the upright portion 8 in this order. The peripheral edge of the diaphragm 11 is clamped between the peripheral edge of the lid 10 and the opening of the upright portion 8 by caulking the peripheral edge of the lid 10 into the opening of the upright portion 8. There is.

Then, in this way, the diaphragm is provided in the opening of the upright portion 8.
By mounting 11 and the lid 10, a negative pressure chamber 14 is formed between the diaphragm 11 and the body 16, and a positive pressure chamber 15 is formed between the diaphragm 11 and the lid 10. Has become.

The valve 5 penetrates the first opening 1 and the second opening 2, and has one end located inside the negative pressure chamber 14 and the other end located outside the body 16, and a shaft 6 of the shaft 6. One end (negative pressure chamber
14)) and a flange-shaped flange 12 whose peripheral portion is bent in the direction of the body 16 over the entire circumference, and a shaft portion 6.
And a flange-shaped valve portion 7 integrally provided on the other end of the one surface, and a projection 7a having a semicircular cross section is integrally provided on the peripheral portion of one surface over the entire circumference.

In the central portion of the valve 5 (the central portion of the shaft portion 6, the collar portion 12 and the valve portion 7) is formed a hole 6a penetrating therethrough in the axial direction,
Through this hole 6a, the other surface of the valve portion 7 of the valve 5 and the positive pressure chamber
It communicates with each other. In addition, 4 is a sealing member that seals between the shaft portion 6 and the first opening portion 1.

The other surface of the collar portion 12 of the valve 5 and the first outside of the body 16
A spring 13 is mounted between the opening 1 and the peripheral edge of the opening 1, and the shaft 6 of the valve 5 is inserted through the center of the spring 13.

Then, the valve 5 is biased toward the lid portion 10 by the biasing force of the spring 13, and one surface of the flange portion 12 is brought into close contact with the center portion of the other surface of the diaphragm 11 and one surface of the valve portion 7 is The protrusion 7a on the peripheral edge of the second opening 2
It comes in contact with and closes the periphery of the.

 Next, the operation of the above-described one will be described.

First, in the valve closed state, due to the cooperation of the supercharging pressure acting on the other surface of the valve portion 7 of the valve 5 and the urging force of the spring 13, the protrusion of the peripheral portion of the one surface of the valve portion 7 of the valve 5 is made. 7a is body 16
The relief port 3 is closed by coming into contact with the peripheral edge of the second opening 2 from the outside. In this case, the valve portion 7 of the valve 5 is the second
Since the force for closing the opening 2 is larger than the supercharging pressure acting on the diaphragm 11 from the positive pressure chamber 15 through the hole 6a of the valve 5, the valve 5 is kept closed.

Then, when a negative pressure is applied to the negative pressure chamber 14 from a pressure supply source (not shown) via the nipple 9, the negative pressure and the supercharging pressure acting on the diaphragm 11 from the positive pressure chamber 15 cooperate with each other. 5 drives in the direction away from the lid 10 against the force that closes the second opening 2, and the valve portion 7 causes the second opening 2 to move.
And the relief port 3 is opened.

When the valve portion 7 separates from the second opening portion 2, the supercharging pressure also acts on one surface of the valve portion 7, so that the valve portion 7 of the valve 5 separates from the second opening portion 2 at a stretch. However, the relief port 3 is opened all at once, and a large amount of relief flow flows into the relief port 3.

[Effect of device]

With this configuration, the invention is configured as described above, and in the closed state, the supercharging pressure acting on the other surface of the valve portion of the valve and the biasing force of the spring cooperate with each other so that one surface of the valve portion of the valve Comes into contact with the peripheral portion of the second opening from the outside of the body, and the relief port is closed. In this case, the force with which the valve portion of the valve closes the second opening is larger than the supercharging pressure acting on the diaphragm from the positive pressure chamber through the hole of the valve, so that the valve closed state is maintained. When a negative pressure is applied to the negative pressure chamber, the negative pressure and the supercharging pressure acting on the diaphragm from the positive pressure chamber cause the valve to resist the force closing the second opening. When driven, the valve portion is separated from the second opening portion and the relief port is opened. In this case, the boost pressure also acts on one surface of the valve portion of the valve, so that the valve portion of the valve is suddenly separated from the second opening portion and the relief port is opened at a stretch. Therefore, a large amount of relief flow can be made to flow to the relief port. Then, the second opening is closed by the cooperation of the supercharging pressure and the biasing force of the spring, and the second opening is opened by the cooperation of the negative pressure and the supercharging pressure. It is possible to reduce the size, and it is possible to greatly reduce the size of the whole, which is an excellent effect.

[Brief description of drawings]

1 and 2 show a relief valve according to the present invention, FIG. 1 is a schematic explanatory view showing a closed state, FIG. 2 is a schematic explanatory view showing an open state, and FIG. 3 is a conventional relief valve. It is a schematic explanatory drawing. 1, 21 ...... First opening 2, 22 ...... Second opening 3, 23 ...... Relief port 4, 24 ...... Sealing member 5, 25 ...... Valve 6, 26 ...... Shaft 6a, 29 ...... Hole 7,27 …… Valve 7a …… Protrusion 8,28 …… Upright part 9,37 …… Nipple 10,30 …… Lid part 11,31 …… Diaphragm 12 …… Bill part 13,33 …… Spring 14 , 34 …… Negative pressure chamber 15, 35 …… Positive pressure chamber 16, 36 …… Body 38, 39 …… Retainer

Claims (1)

(57) [Scope of utility model registration request] 1. A body (16) having a relief port (3) inside and a first opening (1) and a second opening (2) penetrating inside and outside the relief port (3).
And a diaphragm (11) mounted on the body (16) and forming a negative pressure chamber (14) between the body (16) and the diaphragm (11). ) And a lid part (10) forming a positive pressure chamber (15) with the first and second opening parts (1) and (2) so as to reciprocate in the body (16). The shaft part (6), which is mounted and has one end located inside the negative pressure chamber (14) and the other end located outside the body (16), and is integrally provided on the other end of the shaft part (6). The positive pressure chamber (15) has a valve portion (7) for opening and closing the second opening (2) from the outside of the body (16) and penetrates the center portion in the axial direction. ), And a valve (5) having a hole (6a) whose other end communicates with the other surface side of the valve part (7), the diaphragm (11) and the front. Body (1
And a spring (13) for urging the valve (5) in one direction.