JP2023061420A - pressure control valve - Google Patents

Abstract

To provide a pressure control valve that enables pressure regulation and relief setting, with a light handle operation by decreasing a load on a pressure regulating handle.SOLUTION: A pressure control valve is equipped with a rotatable pressure regulating handle 10 that is arranged outside a casing 1, a slide plate 13 that moves in an axial direction by rotations of the pressure regulating handle 10 and compresses a pressure regulating spring 7, and an assist piston 14 that is slidably arranged in a second cylinder portion 4b, contacts with the slide plate 13 to separate atmospheric pressure and pressure on a secondary side 2b, receives the pressure on the secondary side 2b to press the slide plate 13, thereby energizing the pressure regulating spring 7 in a compressing direction.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure control valve used in pneumatic tools, etc., and more particularly, to a pressure control valve that reduces the load applied to a pressure control handle so that pressure control and relief setting can be performed with a light handle operation. It relates to control valves.

Conventionally, for example, a pressure control valve is known that is interposed between an air compressor and a pneumatic tool to reduce and adjust the air pressure supplied from the air compressor to the pneumatic tool to a desired air pressure.
As such a pressure control valve, for example, there is a pressure control valve as shown in FIG. 4 (see Patent Document 1).

This pressure control valve has a fluid passage formed inside the casing 1, and a valve spring 31 is interposed in the fluid passage to divide the fluid passage into a passage on the primary side 2a and a passage on the secondary side 2b. A valve body 3, a cylinder portion 4 formed inside the casing 1, a piston 5 slidably disposed in the cylinder portion 4, and a tip end extending from the piston 5 toward the valve body 3 side. a valve chamber 12 in which the valve body 3 is arranged and into which the piston small diameter portion 51 is slidably inserted; is separated from the valve body 3, a hollow rod 8' inserted into the small-diameter portion 51 of the piston so that the tip end contacts the valve body 3, and the rod 8' and a relief passage 9' for opening the passage of the secondary side 2b to the atmosphere via the rod 8' when the tip of the valve body 3 is separated from the valve body 3. The rod 8' is formed integrally with the casing 1, and forms a relief passage 9' leading to the outside of the casing 1 from its tip.

As shown in FIG. 4(a), this pressure control valve compresses the pressure regulating spring 7 by tightening the pressure regulating handle 10' screwed onto the outer periphery of the casing 1, causing the piston 5 to move backward. By separating the valve seat 61 from the valve body 3, the compressed air in the passage on the primary side 2a is introduced into the passage on the secondary side 2b.
When the passage of the secondary side 2b reaches the set pressure, as shown in FIG. , and presses the valve seat 61 against the valve body 3 to block the passage of the primary side 2a and the passage of the secondary side 2b, thereby preventing pressure rise in the passage of the secondary side 2b.
Next, when the air pressure in the passage of the secondary side 2b is lowered by using an air pressure tool or the like, the piston 5 is retracted again by the pressure regulating spring 7, and the valve seat 61 is moved away from the valve body 3 as shown in FIG. 4(a). By separating them, the compressed air in the passage on the primary side 2a is introduced into the passage on the secondary side 2b.
Also, when the secondary side pressure rises above the set pressure, or when the set pressure is lowered by loosening the pressure adjusting handle 10' and reducing the amount of compression of the pressure adjusting spring 7, the pressure shown in FIG. As shown, due to the increase in the pressure ratio of the secondary side pressure to the spring force, the piston 5 advances and pushes the valve body 3 further, blocking the passage of the primary side 2a and the passage of the secondary side 2b. The body 3 is separated from the rod 8' of the casing 1 and the pressurized air in the passage of the secondary side 2b is vented to the atmosphere through the relief passage 9' of the rod 8'.
Then, the piston 5 retreats as the secondary side pressure decreases, and when the secondary side pressure and the set pressure are balanced, the state shown in FIG. 4(b) is restored.

By the way, this conventional pressure control valve adjusts the set pressure by increasing or decreasing the compression amount of the pressure adjusting spring 7 by rotating the pressure adjusting handle 10', but the pressure adjusting spring 7 has a large spring constant. As a result, a large load is applied to the pressure adjustment handle 10', and the operation of the handle becomes heavy, making pressure adjustment and setting during relief difficult.

JP-A-11-305843

In view of the above problems of the conventional pressure control valve, the present invention is a pressure control valve that reduces the load applied to the pressure control handle so that pressure adjustment and relief setting can be performed with light handle operation. The purpose is to provide a valve.

In order to achieve the above object, the pressure control valve of the present invention reduces and adjusts the primary side pressure to a desired secondary side pressure by rotating a pressure regulating handle. A first cylinder portion and a second cylinder portion are formed inside, and a passage for flowing air to the secondary side and a relief passage for discharging the secondary side pressure to the atmosphere are slidably disposed in the first cylinder portion. A piston, a valve chamber into which the tip of the piston is inserted, a pressure adjusting spring that urges the piston in a direction in which the valve body separates from the valve seat, and a rotatable pressure adjusting handle provided outside the casing. , a slide plate that moves in the axial direction by rotation of the pressure adjustment handle and compresses the pressure adjustment spring; and an assist piston that presses the slide plate in response to the secondary side pressure to urge the pressure adjustment spring in the direction of compression.

In this case, a regulating ring rotatably disposed on the outer circumference of the casing, a set screw disposed in a threaded hole penetrating from the outer circumference to the inner circumference of the regulating ring, and a set screw regulate the rotation of the pressure adjusting handle. and a stopper, so that the regulating ring is fixed to the casing by a set screw at the position of the pressure adjusting handle at which the pressure control valve is set to the maximum pressure.

According to the pressure control valve of the present invention, there is provided a rotatable pressure adjusting handle, a slide plate that moves in the axial direction by rotation of the pressure adjusting handle and compresses the pressure adjusting spring, and a slide plate that is slidably disposed on the second cylinder portion. an assist piston provided in contact with the slide plate to separate the atmospheric pressure and the secondary side pressure, and to press the slide plate by receiving the secondary side pressure, thereby urging the pressure adjustment spring in the direction of compression. By providing the pressure adjusting handle, the load applied to the pressure adjusting handle can be reduced, and pressure adjustment and setting for relief can be performed with a light handle operation.

A regulating ring rotatably arranged on the outer circumference of the casing, a set screw arranged in a threaded hole penetrating from the outer circumference to the inner circumference of the regulating ring, and a stopper for regulating the rotation of the pressure adjusting handle by the set screw. and by fixing the regulating ring to the casing with a set screw at the position of the pressure adjusting handle at which the pressure control valve can set the maximum pressure, 2 The pressure adjustment handle can be set so that it does not rotate beyond the maximum pressure on the secondary side, preventing damage to equipment such as tools connected to the secondary side, and greatly improving the adjustment workability in production. .

BRIEF DESCRIPTION OF THE DRAWINGS One Example of the pressure control valve of this invention is shown, (a) is an external view, (b) is sectional drawing. Explanatory diagrams of the constituent members of the pressure control valve, (a) is an external view of the casing, (b) is an external view of the slide plate, (c1) is a right side view of the pressure adjustment handle, and (c2) is the internal structure. , (d1) is a left side view of the regulating ring, and (d2) is a sectional view of the internal structure thereof. FIG. 4 is an operation explanatory diagram of the same pressure control valve; FIG. 10 is an operation explanatory diagram of a conventional pressure control valve;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a pressure control valve according to the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the pressure control valve of the present invention.
This pressure control valve reduces and adjusts the pressure on the primary side 2a to a desired pressure on the secondary side 2b by rotating the pressure regulating handle 10. The second cylinder part 4b is formed, and the first cylinder part 4a is slidably provided with a passage 6 for flowing air to the secondary side 2b and a relief passage 9 for releasing the pressure of the secondary side 2b to the atmosphere. A piston 5, a valve chamber 12 into which a hollow tip portion 8 of the piston 5 is inserted, a pressure adjusting spring 7 that urges the piston 5 in a direction in which the valve element 3 is separated from the valve seat 11, and the outside of the casing 1. A rotatable pressure adjusting handle 10, a slide plate 13 that moves in the axial direction by rotation of the pressure adjusting handle 10 and compresses the pressure adjusting spring 7, and a second cylinder portion 4b that is slidable. In the direction of compressing the pressure adjusting spring 7 by contacting the disposed slide plate 13 to separate the pressure of the secondary side 2b from the atmospheric pressure, and by receiving the pressure of the secondary side 2b to press the slide plate 13. and an assist piston 14 that urges it.

The casing 1 is formed with two elongated through holes 1b facing the hollow shaft portion 1a, and a slide plate 13 connected via a connecting portion 13a is inserted through the through holes 1b. do.

The pressure adjusting handle 10 is formed of a cylindrical body, and has a double spiral groove 10a around its inner peripheral surface for engagement with the tip of the slide plate 13. The pressure adjusting handle 10 is rotatably fitted to the casing 1, By rotating the pressure adjusting handle 10, the slide plate 13 engaged with the double spiral groove 10a is moved in the axial direction.

The pressure adjusting handle 10 is formed with a passage 10b communicating with the relief passage 9 for releasing the pressure of the secondary side 2b to the atmosphere and for releasing air to the atmosphere.

A regulating ring 15 rotatably disposed on the outer circumference of the casing 1 is formed with a screw hole 15a penetrating from the outer circumference to the inner circumference of the regulating ring 15, and the through hole formed in the pressure adjusting handle 10 is inserted into the screw hole 15a. A set screw 16 operated from 10c is provided, and a stopper 10d is formed on the pressure adjustment handle 10 to restrict the rotation of the pressure adjustment handle 10 by coming into contact with the set screw 16, and the maximum pressure control valve can be set. A regulating ring 15 is fixed to the casing 1 with a set screw 16 at the position of the pressure adjusting handle 10 which is the pressure.
The mechanism for restricting the rotation of the pressure adjustment handle 10 restricts the rotation of the pressure adjustment handle 10 to less than one rotation. has been
The pressure adjusting handle 10 is provided with a pressure scale 10e.
As a result, with a simple structure and work, it is possible to set the pressure adjustment handle 10 so that it does not rotate beyond the maximum pressure on the secondary side. Adjustment workability in production can be greatly improved.

The secondary side 2b is composed of an air coupler 17 screwed to the casing 1, and is provided with a valve 19 which is opened by inserting a tool-side socket (not shown) through a seal member 18.
The spring 20 that biases the valve 19 in the closing direction contacts the assist piston 14 at the other end thereof, thereby simultaneously biasing the assist piston 14 .

Next, the operation of this pressure control valve will be explained.
When the pressure adjusting handle 10 is rotated from the initial state (stopped state) shown in FIG. leftward in the drawing), and moves the piston 5 in the axial direction (leftward in the drawing) via the pressure adjusting spring 7 .
The tip 8 of the moved piston 5 presses the valve body 3, and the valve body 3 separates from the valve seat 11 disposed at a fixed position in the casing 1, thereby opening the passage 6 from the primary side 2a. Air flows through the secondary side 2b.
Here, even when a tool-side socket (not shown) is inserted into the air coupler 17 and air is supplied to the tool side, the state shown in FIG. 3B is maintained.

At this time, the air flowing to the secondary side 2b acts on the back surface of the assist piston 14, and moves the slide plate 13 in the direction of compressing the pressure adjusting spring 7 (leftward in the drawing) via the assist piston 14.
As a result, the load applied to the pressure adjusting handle 10 when rotating the pressure adjusting handle 10 can be reduced, and pressure adjustment and setting for relief can be performed with a light handle operation.

Further, when the pressure adjusting handle 10 is further rotated to strongly compress the pressure adjusting spring 7 with the slide plate 13 to increase the pressure on the secondary side 2b, the load applied to the slide plate 13 increases, but the load on the secondary side increases. As the pressure on the secondary side 2b increases, the force with which the assist piston 14 pushes the slide plate 13 also increases in proportion to the magnitude of the pressure on the secondary side 2b. Therefore, it is possible to always maintain a light steering operation regardless of the magnitude of the set pressure on the secondary side 2b.

When the pressure on the secondary side 2b rises to a predetermined pressure set by the pressure adjusting handle 10, the piston 5 moves in the opposite axial direction (to the right in the drawing) as shown in FIG. The pressing state of the valve body 3 by the tip portion 8 is released, and the separated valve body 3 is seated on the valve seat 11, thereby stopping the flow of air from the primary side 2a to the secondary side 2b.

In this state, when the pressure adjusting handle 10 is rotated in the opposite direction, as shown in FIG. As a result, the biasing force of the pressure adjusting spring 7 is reduced, and the piston 5 moves in the opposite axial direction (to the right in the drawing).
The tip 8 of the moved piston 5 is separated from the valve body 3, so that air is released from the secondary side 2b to the atmosphere through the passage 6, the relief passage 9, and the passage 10b formed in the pressure adjusting handle 10. released.
When the pressure on the secondary side 2b drops to the atmospheric pressure, the piston 5 moves axially (to the left in the drawing) and returns to the initial state (stopped state) shown in FIG. 3(a).

As described above, the pressure control valve of the present invention has been described based on the embodiments thereof, but the present invention is not limited to the constructions described in the above embodiments, and the construction thereof may be changed as appropriate without departing from the scope of the invention. It is something that can be done.

The pressure control valve of the present invention has the characteristic that pressure adjustment and relief setting can be performed with a light handle operation by reducing the load applied to the pressure adjustment handle. It can be widely used for pressure control valve applications.

REFERENCE SIGNS LIST 1 casing 1a shaft portion 1b through hole 2a primary side 2b secondary side 3 valve element 4a first cylinder portion 4b second cylinder portion 5 piston 6 passage 7 pressure adjusting spring 8 tip portion of piston 9 relief passage 11 valve seat 10 pressure Adjustment handle 10a Double spiral groove 10b Passage 10c Through hole 10d Stopper 10e Pressure scale 12 Valve chamber 13 Slide plate 13a Connecting part 14 Assist piston 15 Regulation ring 15a Screw hole 16 Set screw 17 Air coupler 18 Sealing member 19 Valve 20 Spring

Claims (2)

In a pressure control valve that reduces and adjusts the primary side pressure to a desired secondary side pressure by rotating a pressure adjusting handle,
Forming a first cylinder part and a second cylinder part inside the casing,
a piston slidably disposed in the first cylinder portion and having a passage for flowing air to the secondary side and a relief passage for releasing secondary side pressure to the atmosphere;
a valve chamber into which the tip of the piston is inserted;
a pressure regulating spring that biases the piston in a direction in which the valve body is separated from the valve seat;
a rotatable pressure adjustment handle disposed outside the casing;
a slide plate that is moved axially by rotation of the pressure adjustment handle to compress the pressure adjustment spring;
The pressure adjustment spring is compressed by contacting the slide plate slidably disposed in the second cylinder portion to separate the atmospheric pressure from the secondary side pressure, and by receiving the secondary side pressure to press the slide plate. A pressure control valve characterized by comprising an assist piston that biases in a direction to a regulating ring rotatably disposed on the outer periphery of the casing;
a set screw disposed in a screw hole penetrating from the outer circumference to the inner circumference of the regulation ring;
and a stopper that regulates the rotation of the pressure adjustment handle by means of a set screw,
2. The pressure control valve according to claim 1, wherein the regulating ring is fixed to the casing with a set screw at the position of the pressure adjusting handle that provides the maximum pressure that the pressure control valve can set.

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