JPH0725500Y2 - Pressure control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a pressure control valve suitable for use in a vacuum circuit, a pneumatic circuit or the like.

(Prior Art) Conventionally, in a vacuum circuit, an air pressure circuit, etc., an intermediate portion of the circuit is used to adjust the suction pressure generated by a vacuum pump and the discharge pressure generated by a compression pump. A pressure control valve is connected and used.

The pressure adjusting valve has a valve box having a pressure adjusting flow path, a valve body that contacts and separates from a valve seat provided in the pressure adjusting flow path, and a spring that presses the valve body against the valve seat. Some of them are further configured to have a spring deflection adjusting portion for adjusting the valve opening pressure of the valve body by adjusting the amount of deflection of the spring. Then, when the pressure of the vacuum circuit or the pneumatic circuit reaches the opening pressure of the pressure regulating valve,
The valve body of the pressure control valve is opened to keep the circuit pressure constant.

(Problems to be solved by the invention) However, in the conventional pressure regulating valve, when the deflection amount of the spring is set to a certain value in order to set the circuit pressure to a certain value, the valve is opened when the valve body is opened. The valve body may cause self-excited vibration. This is not proper because not only the pressure cannot be set accurately but also abnormal noise is caused.

An object of the present invention is to prevent the self-excited vibration of the valve body, and thereby to set an accurate pressure without causing abnormal noise.

[Constitution of the Invention] (Means for Solving the Problems) The present invention according to claim 1 is a valve box provided with a flow path for pressure adjustment,
In a pressure regulating valve configured to have a valve body that comes into contact with and separates from a valve seat provided in the pressure regulating flow path, and a spring that presses the valve body against the valve seat, the pressure regulating valve that comes into contact with the valve seat. A valve body guide portion that guides the movement of the valve body to be separated is provided on the valve box side, and a single inlet is provided on the opposite side of the spring installation region for the valve seat of the pressure adjusting flow path, The valve body side opening of the inflow port is eccentrically arranged with respect to the axis of the valve body.

A second aspect of the present invention is a valve box having a pressure adjusting flow path,
In a pressure regulating valve configured to have a valve body that comes into contact with and separates from a valve seat provided in the pressure regulating flow path, and a spring that presses the valve body against the valve seat, the pressure regulating valve that comes into contact with the valve seat. A valve body guide part that guides the movement of the valve body to be separated is provided on the valve box side, and a plurality of inflow ports are provided on the opposite side of the spring disposition region with respect to the valve seat of the pressure adjusting flow path. The valve body side opening of the inflow port is asymmetrically arranged around the axis of the valve body.

(Operation) According to the present invention as set forth in claim 1, the following operation effects are obtained.

The pressure exerted on the valve body from the valve body side opening of the single inflow port becomes an eccentric load F on the valve body, and this eccentric load F exerts a moment M on the valve body, so that the valve body is based on this moment. The pressing force N strongly presses the valve body guide portion. Therefore, a relatively large frictional resistance force R based on the pressing force N is applied between the valve element and the valve element guide portion.
Occurs. The self-excited vibration of the valve element is damped by the existence of the frictional resistance R. As a result, the self-excited vibration of the valve element can be reliably prevented, and as a result, accurate pressure setting can be performed without causing abnormal noise.

According to the present invention as set forth in claim 2, there are the following operational effects.

The resultant force of the pressure exerted on the valve body from the valve body side openings of the plurality of inlets becomes an eccentric load F on the valve body, and this eccentric load F exerts a moment M on the valve body, and as a result, the valve body has this moment. It is strongly pressed against the valve body guide portion by the pressing force N based on it. Therefore, a relatively large frictional resistance R based on the pressing force N is generated between the valve body and the valve body guide portion. The self-excited vibration of the valve element is damped by the existence of the frictional resistance R. As a result, the self-excited vibration of the valve element can be reliably prevented, and as a result, accurate pressure setting can be performed without causing abnormal noise.

(Example) FIG. 1 (A) is a sectional view showing a pressure regulating valve for a vacuum circuit to which the present invention is applied, FIG. 1 (B) is an end view of FIG. 1 (A), and FIG. 2 is a vacuum. Circuit diagram, FIG. 3 (A) is a sectional view showing another pressure regulating valve to which the present invention is applied, FIG. 3 (B) is an end view of FIG. 3 (A), and FIG. 4 (A) is FIG. 4 is a sectional view showing a pressure regulating valve for a pneumatic circuit to which the present invention is applied, FIG. 4 (B) is an end view of FIG. 4 (A), and FIG. 5 is a pneumatic circuit diagram.

In FIG. 2, 1 is a vacuum pump, 2 is an electromagnetic opening / closing valve, 3
Is a suction cup, and 10 is a pressure control valve. The pressure adjusting valve 10 adjusts the suction pressure generated by the vacuum pump 1, and thus adjusts the suction pressure of the suction cup 3.

As shown in FIG. 1 (A), the pressure regulating valve 10 has an inner cylindrical portion 11
The outer cylinder portion 12 screwed to the inner cylinder portion 11 forms a valve box 13. The valve box 13 is provided with a pressure adjusting flow passage 16 which extends from a connection port 14 provided in the inner tubular part 11 to an atmosphere opening port 15 (inflow port) provided in the outer tubular part 12. Connection port 14 is vacuum pump 1
Is connected to a vacuum pipe line between the electromagnetic on-off valve 2. In addition, 17 is a lock nut.

The pressure regulating valve 10 has a valve body 18 inside the valve box 1. The valve body 18 is an outer cylinder portion forming the pressure adjusting flow path 16.
It comes in contact with and separates from the valve seat 19 provided on 12.

Further, the pressure regulating valve 10 has a spring 20 inside the valve box 13. The spring 20 is backed up by the inner cylinder portion 11 and presses the valve body 18 against the valve seat 19.

The pressure adjusting valve 10 uses the inner cylindrical portion 11 screwed to the outer cylindrical portion 12 as a spring deflection adjusting portion. That is, the inner tube portion 11
Adjusts the bending amount of the spring 20 by adjusting the screwing amount with respect to the outer cylinder portion 12, and thus adjusts the valve opening pressure of the valve body 18. It should be noted that the spring deflection adjusting portion is not essential in implementing the present invention.

That is, in the pressure control valve 10, when the pressure in the vacuum circuit reaches the valve opening pressure, the valve body 18 is opened against the elastic load of the spring 20 to keep the circuit pressure constant.

However, in the pressure regulating valve 10, the valve body guide portion 21 that guides the movement of the valve body 18 that moves toward and away from the valve seat 19 is provided with the outer cylinder portion.
It is provided on the inner surface of 12. The valve body guide portion 21 slides an integral pin 18A on the valve body 18 to guide the valve body 18.

Further, in the pressure regulating valve 10, as described above, on the side of the pressure regulating passage 16 opposite to the region where the spring 20 is arranged with respect to the valve seat 19.
A single atmosphere opening port 15 is provided, and the valve body side opening 15A of the atmosphere opening port 15 is eccentrically arranged with respect to the axis of the valve body 18.

The pressure adjusting flow path 16 is provided with an intermediate flow path 22 concentric with the valve seat 19 between the atmosphere opening 15 and the valve seat 19. However, the intermediate flow path 22 is not essential in the practice of the present invention.

Next, the operation of the above embodiment will be described.

The pressure exerted on the valve body 18 from the valve body side opening portion 15A of the single atmosphere opening port 15 becomes an eccentric load F on the valve body 18, and this eccentric load F exerts a moment M on the valve body 18, resulting in a valve M The body 18, especially the pin 18A, is strongly pressed against the valve body guide portion 21 by the pressing force N based on this moment M.
Therefore, a relatively large frictional resistance force R based on the pressing force N is generated between the valve body 18 and the valve body guide portion 21.
Then, the self-excited vibration of the valve body 18 is damped by the existence of the frictional resistance force R. This makes it possible to reliably prevent the self-excited vibration of the valve body 18 no matter what value the flexure amount of the spring 20 is adjusted to adjust the pressure.
Accurate pressure setting can be performed without causing abnormal noise.

As shown in FIG. 3 (A), the pressure regulating valve 110 shown in FIG.
The inner cylinder part 11 and the outer cylinder part 12 screwed to the inner cylinder part 11 form a valve box.
Forming thirteen. The valve box 13 is a connection port 14 provided on the inner cylinder part 11.
To three atmosphere opening ports 121 (inflow ports) provided in the outer cylinder part 12
A pressure adjusting flow path 16 is provided so as to penetrate therethrough. Connection
14 is connected to a vacuum line between the vacuum pump 1 and the electromagnetic opening / closing valve 2. In addition, 17 is a lock nut.

Further, the pressure adjusting valve 110 has a valve body 18 inside the valve box 13. The valve body 18 comes into contact with and separates from a valve seat 19 provided on the outer cylinder portion 12 forming the pressure adjusting flow path 16.

Further, the pressure regulating valve 110 has a spring 20 inside the valve box 13. The spring 20 is backed up by the inner cylinder 11, and the valve body 18
Is pressed against the valve seat 19.

The pressure adjusting valve 110 uses the inner cylindrical portion 11 screwed to the outer cylindrical portion 12 as a spring deflection adjusting portion. That is, the inner cylinder part
11 is by adjusting the screwing amount to the outer cylinder part 12,
The amount of deflection of the spring 20 is adjusted, and the valve opening pressure of the valve body 18 is adjusted accordingly. It should be noted that the spring deflection adjusting portion is not essential in implementing the present invention.

That is, in the pressure regulating valve 110, when the pressure in the vacuum circuit reaches the above-mentioned valve opening pressure, the valve element 18 is resisted against the elastic load of the spring 20.
Open and keep the circuit pressure constant.

However, in the pressure regulating valve 110, the valve body guide portion 21 that guides the movement of the valve body 18 that moves toward and away from the valve seat 19 is provided on the inner surface of the outer tubular portion 12. The valve body guide portion 21 slides an integral pin 18A on the valve body 18 to guide the valve body 18.

The difference between the pressure adjusting valve 110 of FIG. 3 and the pressure adjusting valve 10 is that, on the side opposite to the area where the spring 20 is provided with respect to the valve seat 19 of the pressure adjusting flow path 16, as described above, the three atmosphere opening ports are provided. 121 (inflow port) are provided, and the valve body side opening 121A of the atmosphere opening port 121
Is only asymmetrically arranged around the axis of the valve body 18.

In the pressure regulating valve 110, the resultant force of the pressures from the valve body side openings 121A of the plurality of atmosphere opening ports 121 to the valve body 18 becomes an eccentric load F with respect to the valve body 18, and the eccentric load F is applied to the valve body 18. As a result of exerting the moment M, the valve body 18 is strongly pressed against the valve body guide portion 21 by the pressing force N based on this moment M. As a result, by preventing self-excited vibration of the valve element 18, accurate pressure setting can be performed without causing abnormal noise.

In FIG. 5, 5 is a compression pump, 6 is a tank, 7 is an electromagnetic opening / closing valve, and 30 is a pressure regulating valve. The pressure adjusting valve 30 adjusts the discharge pressure generated by the compression pump 5, and thus adjusts the discharge pressure from the tank 6.

As shown in FIG. 4 (A), the pressure regulating valve 30 has an inner cylindrical portion 31.
The outer cylinder portion 32 screwed to the inner cylinder portion 31 forms a valve box 33. The valve box 33 includes a pressure adjusting flow path 36 that extends from a connection port 34 (inflow port) provided in the inner tubular portion 31 to an atmosphere opening port 35 provided in the outer tubular portion 32. The connection port 34 is connected to the pneumatic circuit between the compression pump 5 and the tank 6. Incidentally, 37 is a lock nut.

Further, the pressure regulating valve 30 has a valve body 38 inside the valve box 33. The valve body 38 is an inner cylindrical portion forming the pressure adjusting circuit 36.
It comes into contact with and separates from a valve seat 39 provided on 31.

Further, the pressure regulating valve 30 has a spring 40 inside the valve box 33. The spring 40 is backed up by the outer cylinder portion 32 and presses the valve element 38 against the valve seat 39.

The pressure adjusting valve 30 uses the inner cylindrical portion 31 screwed to the outer cylindrical portion 32 as a spring deflection adjusting portion. That is, the inner cylindrical portion 31
Adjusts the amount of bending of the spring 40 by adjusting the screwing amount with respect to the outer cylinder portion 32, and thus adjusts the valve opening pressure of the valve body 38.

That is, in the pressure regulating valve 30, when the pressure in the pneumatic circuit reaches the valve opening pressure, the valve body 38 is opened against the elastic load of the spring 40, and the circuit pressure is kept constant.

However, in the pressure regulating valve 30, the valve body guide portion 41 that guides the movement of the valve body 38 that moves toward and away from the valve seat 39 is provided with the outer cylinder portion.
It is provided on the inner surface of 32. The valve body guide portion 41 slides a pin 42 integral with the valve body 38 to guide the valve body 38.

Further, in the pressure adjusting valve 30, as described above, on the side of the pressure adjusting passage 36 opposite to the region where the spring 40 is arranged with respect to the valve seat 39, as described above.
A single connection port 34 is provided, and the valve body side opening 34A of the connection port 34 is provided.
Are eccentrically arranged with respect to the axis of the valve element 38.

Therefore, in the pressure regulating valve 30, the pressure applied from the valve body side opening 34A of the single connection port 34 to the valve body 38 becomes the eccentric load F with respect to the valve body 38, and the eccentric load F is applied to the valve body 38. As a result of exerting the moment M, the valve element 38, particularly the pin 42, is strongly pressed against the valve element guide portion 41 by the pressing force N based on this moment M. As a result, by preventing self-excited vibration of the valve element 38, accurate pressure setting can be performed without causing abnormal noise.

[Advantages of the Invention] As described above, according to the present invention, by preventing self-excited vibration of the valve body, accurate pressure setting can be performed without causing abnormal noise.

[Brief description of drawings]

FIG. 1 (A) is a sectional view showing a vacuum circuit pressure regulating valve to which the present invention is applied, FIG. 1 (B) is an end view of FIG. 1 (A), FIG. 2 is a vacuum circuit diagram, and FIG. Fig. 3 (A) is a sectional view showing another pressure regulating valve to which the present invention is applied, Fig. 3 (B) is an end view of Fig. 3 (A), and Fig. 4 (A) is applied to the present invention. Sectional drawing which shows the pressure regulating valve for pneumatic circuits which was carried out, FIG. 4 (B) is an end view of FIG. 4 (A), and FIG. 5 is an pneumatic circuit diagram. 10, 30, 110 ... Pressure regulating valve, 13, 33 ... Valve box, 15, 121 ... Atmosphere opening (inlet), 15A, 121A ... Valve body side opening, 16, 3
6 ... Pressure adjusting flow path, 18, 38 ... Valve body, 19, 39 ... Valve seat, 2
0, 40 ... Spring, 21, 41 ... Valve body guide part, 34 ... Connection port, 34A
… Valve side opening.

Claims (2)

[Scope of utility model registration request] 1. A valve box having a pressure adjusting flow path, a valve body that comes into contact with and separates from a valve seat provided in the pressure adjusting flow path, and a spring that presses the valve body against the valve seat. In the pressure adjusting valve configured as described above, a valve body guide portion that guides the movement of the valve body that comes into contact with and separates from the valve seat is provided on the valve box side, and the pressure adjusting flow path with respect to the valve seat is provided. A pressure regulating valve characterized in that a single inflow port is provided on the opposite side of the spring installation region, and the valve body side opening of this inflow port is eccentrically arranged with respect to the axis of the valve body. 2. A valve box provided with a pressure adjusting flow path, a valve body that comes into contact with and separates from a valve seat provided in the pressure adjusting flow path, and a spring that presses the valve body against the valve seat. In the pressure adjusting valve configured as described above, a valve body guide portion that guides the movement of the valve body that comes into contact with and separates from the valve seat is provided on the valve box side, and the pressure adjusting flow path with respect to the valve seat is provided. A pressure regulating valve characterized in that a plurality of inflow ports are provided on the opposite side of the spring disposition region, and the valve body side openings of these inflow ports are asymmetrically arranged around the axis of the valve body.