JP7009525B2 - Pressure control valve - Google Patents

Description

The present invention relates to a pressure regulating valve, and more particularly to a pressure regulating valve that adjusts the pressure of a gas supplied to an external pneumatic device to a predetermined value.

In automatic equipment lines and the like for assembling mechanical devices and electronic devices, devices using pneumatic devices exemplified by air cylinders and the like are often used. Since the working pressure is set for each of these pneumatic devices, a pressure regulating valve that adjusts the pressure of the supplied gas to a predetermined value has been conventionally used.

For example, as a conventional pressure regulating valve, the configuration described in Patent Document 1 (Japanese Unexamined Patent Publication No. 2004-192462) is known. This pressure regulating valve is configured so that an arbitrary pressure can be set between the high pressure region and the low pressure region by operating the operation dial.

The "pressure regulating valve" is a "safety valve (relief valve)" that protects the equipment by releasing the pressure when the pressure of the gas supplied due to some abnormality exceeds a predetermined value. It is different in the configuration.

Japanese Unexamined Patent Publication No. 2004-192462

Here, in the conventional pressure regulating valve as exemplified in Patent Document 1, the pressure can be adjusted arbitrarily by operating the operation dial, but man-hours for adjustment are required, and the operation dial is slightly touched. Even if it does, there is a risk that an unintended change in the set pressure will occur. Further, by providing the adjustment mechanism, the number of parts increases and the structure becomes complicated.

Further, in the connected pneumatic device, the operating pressure of the supply gas is set to a predetermined value in order to obtain accurate operation. Therefore, the pressure regulating valve is required to be able to adjust the pressure of the supplied gas with high accuracy so as to have a predetermined value with as little fluctuation as possible.

The present invention has been made in view of the above circumstances, and it is possible to perform highly accurate adjustment by suppressing pressure fluctuations of the supplied gas, reduce adjustment man-hours, and prevent unintended changes in set pressure. It is intended to provide a possible pressure regulating valve.

As an embodiment, the problem is solved by a solution means as disclosed below.

The disclosed pressure regulating valve is a pressure regulating valve that adjusts the pressure of the gas supplied to the external pneumatic device to a predetermined value, and is provided at a tubular main body case and the first end portion of the main body case to supply an external gas. A primary port having an intake port connected to the source, a secondary port having an exhaust port provided at the second end of the main body case and connected to the external pneumatic device, the intake port and the exhaust. A first flow path that communicates with the mouth and allows fluid to pass through, an on-off valve that is provided in the middle of the first flow path to open and close the flow path, and a main body case that is provided inside the main body case. A tubular guide member having an outer diameter smaller than the inner diameter of the guide member, and a tubular flow path constituent member provided inside the guide member and having an outer diameter smaller than the inner diameter of the guide member are provided. The secondary port and the secondary port are arranged so that the central axis of the intake port and the central axis of the exhaust port are coaxial with each other, and the flow path component member is the first in the radial center. The first space constituting the flow path, the first through hole communicating the inside and the outside of the first space, and the seat surface constituting the valve seat of the on-off valve at the end near the secondary port. The on-off valve has a small diameter portion having a relatively small outer diameter formed closer to the primary port, and a large diameter portion having a relatively large outer diameter formed closer to the secondary port. The small diameter portion is fitted with a first seal and the large diameter portion is fitted with a second seal. The valve body constitutes the first flow path in the radial center. It has a second space and a second through hole that communicates the inside and the outside of the second space, and the small diameter portion is internally fitted into the guide member so as to be reciprocating, and the large diameter portion is the main body. It is arranged so as to be reciprocally fitted in the case, and the pressure receiving area on the primary port side is defined by the inner diameter of the seat surface at the position where the first seal abuts, and the secondary port The pressure receiving area on the side is defined by the inner diameter of the main body case at the position where the second seal abuts, and the valve body is parallel to the central axis of the intake port and the central axis of the exhaust port. A urging member for urging in the direction from the next port to the secondary port is further provided, and the third space between the inner surface of the peripheral wall portion of the guide member and the outer surface of the peripheral wall portion of the flow path constituent member is the second flow path. The second flow path is configured to communicate with the first flow path through the first through hole of the flow path constituent member and the second through hole of the valve body. At the same time, only the flow in the direction from the secondary port to the primary port on the way It is characterized in that a check valve is provided to allow the above.

According to the disclosed pressure regulating valve, it is possible to suppress the pressure fluctuation of the gas supplied to the external pneumatic device and perform high-precision adjustment. Further, since the configuration without the operation dial is realized, it is possible to reduce the adjustment man-hours and prevent an unintended change in the set pressure.

It is a schematic diagram (front sectional view) which shows the example of the pressure regulating valve which concerns on embodiment of this invention. It is a schematic diagram (front sectional view) which shows the example of the pressure regulating valve which concerns on embodiment of this invention. 1 is an enlarged view of a flow path constituent member of the pressure regulating valve shown in FIGS. 1 and 2. It is an enlarged view of the valve body of the on-off valve of the pressure regulating valve shown in FIGS. 1 and 2. It is the measurement data of the pressure characteristic of the pressure regulating valve which concerns on embodiment of this invention, and the pressure regulating valve which concerns on a conventional embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are both front sectional views (schematic views) showing an example of the pressure regulating valve 1 according to the present embodiment. FIG. 1 shows a state in which the on-off valve 30 is "open", and FIG. 2 shows a state in which the on-off valve 30 is "open". The on-off valve 30 is in the "closed" state. Further, FIG. 3 is an enlarged view of the flow path constituent member 50 in the pressure regulating valve 1, and FIG. 4 is an enlarged view of the valve body 31 of the on-off valve 30 in the pressure regulating valve 1. In all the drawings for explaining the embodiment, the members having the same function may be designated by the same reference numerals, and the repeated description thereof may be omitted.

The pressure regulating valve 1 according to the present embodiment supplies gas (air) whose pressure is adjusted to a predetermined value to a pneumatic device provided in an automatic equipment line or the like for assembling mechanical devices, electronic devices, and the like. Is. Specific examples of the pneumatic device include actuators such as air cylinders, vacuum generators, air blows, and the like. In each case, the pressure (operating pressure) of the gas supplied in order to perform accurate operation is set as a predetermined value. Further, as a characteristic common to these pneumatic devices, the operation of reducing the internal pressure (operating pressure) of the secondary side, that is, the pneumatic device is performed by the depressurization of the primary side of the pressure regulating valve 1.

As shown in FIGS. 1 and 2, the pressure regulating valve 1 includes a tubular main body case 10 (for example, the overall shape is cylindrical), and a primary port 12 is provided at one of the first end portions 10a. A secondary port 14 is provided at the other second end portion 10b. As an example, the primary port 12 is configured by fitting the first pipe joint 16 in the first end portion 10a, and the opening of the first pipe joint 16 is an external gas supply source (non-existent) such as an air compressor. It is configured as an intake port 16a connected directly to (not shown) or via a pipe (however, it becomes an exhaust port when gas flows in the opposite direction). Further, the secondary port 14 is configured by fitting a second pipe joint 18 in the second end portion 10b, and the opening of the second pipe joint 18 is directly or directly with respect to the above-mentioned external pneumatic device. It is configured as an exhaust port 18a connected via a pipe (however, it becomes an intake port when gas flows in the opposite direction). The second pipe joint 18 is attached to the cap member 22 fitted to the second end portion 10b of the main body case 10 due to the convenience of incorporating the valve body 31 (described later) of the on-off valve 30 into the main body case 10 in the manufacturing process. It has a fixed structure. Further, known pipe joints are used for the first pipe joint 16 and the second pipe joint 18, and the detailed configuration thereof will be omitted.

Inside the main body case 10, a first flow path 20 that communicates between the intake port 16a and the exhaust port 18a and allows the fluid to pass through is provided. Further, an on-off valve 30 is provided in the middle of the flow path of the first flow path 20 in which the valve body 31 reciprocates in the direction parallel to the central axis C to open and close the flow path (details will be described later).

As a characteristic configuration of the present embodiment, in the primary port 12 and the secondary port 14, the central axis of the intake port 16a and the central axis of the exhaust port 18a are coaxial (here, on the C axis). It is configured. According to this, coupled with the structure of the main body case 10 having a substantially cylindrical shape, it is possible to realize the pressure regulating valve 1 as a slim and compact shape. In particular, since the entire body can be accommodated within the outer diameter of the main body case 10 in the radial direction, it can be installed in a narrower place than the conventional device.

In order to realize the above configuration, the pressure regulating valve 1 has the following internal configuration. First, a cylindrical shape provided inside the main body case 10 and having a predetermined portion having an outer diameter smaller than the inner diameter of the main body case 10 and having a central axis coaxial with the central axis C of the main body case 10 (as an example, outline). It has a guide member 40 having a cylindrical shape). In the present embodiment, the end portion of the guide member 40 on the primary port 12 side is provided as an integral configuration continuous with the inside of the main body case 10. However, the configuration is not limited to this, and the guide member 40 may be provided as a separate configuration from the main body case 10. The material constituting the main body case 10 and the guide member 40 may be appropriately selected from a metal material or a resin material.

Further, a cylindrical shape provided inside the guide member 40, having a predetermined portion having an outer diameter smaller than the inner diameter of the guide member 40 and having a central axis coaxial with the central axis C of the main body case 10 (as an example, outline). It has a flow path component 50 having a different diameter (cylindrical shape). Here, a first space 52 constituting the first flow path 20 (20A) is provided at the center in the radial direction, and further, a first space is provided at a position closer to the primary port 12 than the check valve 60 described later. A first through hole 54 that communicates the inside and the outside of the 52 is provided. In this embodiment, the flow path constituent member 50 is provided as a separate body from the guide member 40. Further, the material constituting the flow path constituent member 50 may be appropriately selected from a metal material or a resin material.

Next, the on-off valve 30 according to the present embodiment will be described. The valve body 31 of the on-off valve 30 has a small diameter portion 31a having a relatively small outer diameter formed closer to the primary port 12, and a large diameter portion 31b having a relatively large outer diameter closer to the secondary port 14. It is formed. Here, the first seal 34 that comes into contact with the valve seat 36 (described later) of the on-off valve 30 is externally fitted to the small diameter portion 31a (for example, the tip small diameter portion 31c formed at the tip of the small diameter portion 31a having a smaller diameter). At the same time, a second seal 35 that abuts (sliding) with the peripheral wall portion 11 (inner surface 11a) of the main body case 10 is externally fitted to the large diameter portion 31b. Further, a second space 32 constituting the first flow path 20 (20B) is provided at the center in the radial direction, and the inside and the outside of the second space 32 are communicated with each other at a position near the tip of the small diameter portion 31a. A second through hole 33 is provided. The material constituting the valve body 31 may be appropriately selected from a metal material or a resin material.

In the valve body 31 having the above configuration, the small diameter portion 31a is reciprocally fitted in the cylinder of the guide member 40, and the large diameter portion 31b is reciprocally fitted in the cylinder of the main body case 10. It is arranged so as to be.

On the other hand, the valve seat 36 to which the valve body 31 of the on-off valve 30 comes into contact with and separates is provided in the flow path constituent member 50. Specifically, the seat surface 36a of the valve seat 36 is formed at the end portion 50a of the flow path constituent member 50 near the secondary port 14. The seat surface 36a is formed as an inclined surface (chamfered) whose diameter increases from the inner surface 56a of the peripheral wall portion 56 toward the end surface 58. In the present embodiment, the first seal 34 provided at the end of the small diameter portion 31a of the valve body 31 near the primary port 12 and the seat surface 36a provided on the flow path constituent member 50 are brought into contact with each other. The opening and closing of the first flow path 20 (that is, switching between communication and non-communication between the first flow path 20A and the first flow path 20B) is performed.

Further, in the pressure regulating valve 1 according to the present embodiment, the valve body 31 of the on-off valve 30 is parallel to the central axis of the intake port 16a and the central axis of the exhaust port 18a (that is, parallel to the central axis C of the main body case 10). ) Further provided with an urging member 62 for urging in the direction from the primary port 12 to the secondary port 14. The urging member 62 is arranged so that a part or all of the urging member 62 is housed in a fourth space 44 between the inner surface 11a of the peripheral wall portion 11 of the main body case 10 and the outer surface 42b of the peripheral wall portion 42 of the guide member 40. It is set up. Here, a third through hole 19 for communicating the inner surface 11a and the outer surface 11b is provided at a predetermined position of the peripheral wall portion 11 of the main body case 10 (position closer to the primary port 12 than the second seal 35). The third through hole 19 is provided to prevent the valve body 31 from becoming immobile due to the space in which the urging member 62 is accommodated being sealed. As an example, a coil spring made of a metal material is used for the urging member 62, but the urging member 62 is not limited to this.

According to this, the on-off valve 30 can be set to the so-called normally open state (the state shown in FIG. 1). Then, by setting the spring rate of the urging member 62 (here, the coil spring), the pressure of the gas sent from the exhaust port 18a of the secondary port 14, that is, the operating pressure of the external pneumatic device can be set to a predetermined value. ..

As described above, the pressure regulating valve 1 according to the present embodiment does not have a pressure adjusting mechanism provided with an operation dial, and the pressure on the secondary port 14 side is selected by selecting the urging member 62 (coil spring) to be incorporated in advance at the time of manufacturing. It is a mechanism to set. Therefore, in the conventional pressure regulating valve as exemplified in Patent Document 1, it is possible to solve the problem that an unintended change in the set pressure occurs even if the operation dial is touched slightly. Furthermore, it is possible to reduce the adjustment man-hours, the number of parts, and the simplification of the structure.

Here, in the on-off valve 30 of the pressure regulating valve 1 for adjusting the pressure, the pressure receiving area on the primary port 12 side is defined by the inner diameter of the seat surface 36a at the position where the first seal 34 abuts, and the secondary port The pressure receiving area on the 14 side is defined by the inner diameter of the main body case 10 at the position where the second seal 35 abuts.

As a result of diligent research by the inventor of the present application on the above configuration, the ratio of the pressure receiving area on the primary port 12 side to the pressure receiving area on the secondary port 14 side in the valve body 31 is 1:25 or more (furthermore). By configuring the ratio to preferably 1:28 or more), the pressure fluctuation of the gas sent from the secondary port 14 side is suppressed when the pressure fluctuation of the gas flowing into the primary port 12 side occurs. It has been clarified that it becomes possible and high-precision pressure adjustment becomes possible. Here, the measurement data in the comparative experiment of the pressure characteristics with respect to the conventional pressure regulating valve is shown in FIG. 5 (as an example, in the case of 1:28). The horizontal axis is the pressure of the gas flowing into the primary port 12 side, and the vertical axis is the pressure of the gas sent out from the secondary port 14 side. The data of the pressure regulating valve 1 according to the present embodiment is shown by a solid line, and the data of the conventional pressure regulating valve (applicant's conventional product RVU6-6 type) is shown by a broken line. As shown in the figure, the pressure fluctuation of the gas sent from the secondary port 14 side is suppressed extremely stably with respect to the pressure fluctuation of the gas flowing into the primary port 12 side as compared with the conventional pressure regulating valve. I got the result. Although slightly inferior to the above characteristics, depending on the required specifications of the connected pneumatic equipment, the pressure fluctuation suppression effect may be obtained even if the ratio is set lower than the above so that the pressure receiving area ratio is 1:20 or more. Can be sufficiently obtained, and further miniaturization can be achieved. On the other hand, when the realization of miniaturization (particularly radial miniaturization) is to be prioritized over the pressure fluctuation suppressing effect, the ratio is further lowered from the above so that the pressure receiving area ratio is 1:10 or more. By doing so, the effect of miniaturization can be remarkably obtained.

As described above, in the pneumatic device connected to the secondary port 14 side, the operating pressure of the supply gas is set to a predetermined value in order to obtain accurate operation, but according to the pressure regulating valve 1 according to the present embodiment. Since the pressure of the gas supplied from the secondary port 14 can be adjusted with high accuracy so as to have a predetermined value that does not fluctuate as much as possible, accurate and stable operation of the connected pneumatic device becomes possible.

On the other hand, in the pneumatic device to which the pressure regulating valve 1 according to the present embodiment supplies gas, the gas pressure on the secondary port 14 side, that is, the internal pressure of the pneumatic device (operation) due to the decompression of the gas pressure on the primary port 12 side. It has the characteristic that the operation of reducing the pressure) is performed. As a configuration for realizing the operation, in the present embodiment, a second space 46 is provided in the third space 46 between the inner surface 42a of the peripheral wall portion 42 of the guide member 40 and the outer surface 56b of the peripheral wall portion 56 of the flow path constituent member 50. It is provided with a flow path 48. More specifically, in the second flow path 48, the gas pressure on the primary port 12 side is 2 when the on-off valve 30 is closed (that is, the gas pressure on the secondary port 14 side reaches a predetermined value, etc.). When the pressure is equal to or lower than the gas pressure on the next port 14 side), the flow path component 50 communicates with the first through hole 54 and the valve body 31 through the second through hole 33. A check valve 60 is provided in the middle of the flow path of the second flow path 48 to allow only the flow in the direction from the secondary port 14 to the primary port 12. There is.

With such a configuration, the pressure regulating valve 1 can be used for adjusting the pressure of the gas supplied to an actuator such as an air cylinder, a vacuum generator, and a pneumatic device such as an air blow to a predetermined value.

Subsequently, the operation of the pressure regulating valve 1 having the above configuration will be described with reference to FIGS. 1 and 2.

First, at the start of use, the on-off valve 30 is in the "open" state as shown in FIG. Next, a gas (compressed air as an example) is sent from an external gas supply source (not shown) to the intake port 16a of the first pipe joint 16 of the primary port 12, and the gas flows through the flow path as shown by the arrow A. Through the first flow path 20A in the component 50 and the first flow path 20B in the valve body 31, from the exhaust port 18a of the second pipe joint 18 of the secondary port 14 to the external pneumatic device (not shown). Be supplied.

Further, the gas is continuously supplied from the exhaust port 18a to the external pneumatic device, and the internal pressure (operating pressure) of the external pneumatic device rises to a predetermined value preset by the urging member 62. .. As a result, a step of operating the external pneumatic device at a predetermined internal pressure (working pressure) is performed.

At this time, the pressure of the gas on the secondary port 14 side reaches a predetermined value, and the on-off valve 30 shifts to the “closed” state as shown in FIG. In this state, gas flow in the pressure regulating valve 1 does not occur.

Next, the pressure of the gas on the primary port 12 side is reduced. As a result, gas is sent from the external pneumatic device to the exhaust port 18a of the second pipe joint 18 of the secondary port 14, and the gas passes through the first flow path 20B in the valve body 31 as shown by the arrow B. It flows from the second through hole 33 to the second flow path 48, and then flows from the first through hole 54 to the first flow path 20A in the flow path constituent member 50, and is the first of the primary port 12. It is sent out from the intake port 16a of one pipe joint 16. As a result, the internal pressure (operating pressure) of the external pneumatic device is reduced, and a preparatory step for the next operation is performed.

As described above, according to the disclosed pressure regulating valve, it is possible to suppress the pressure fluctuation of the gas supplied to the external pneumatic device and perform high-precision adjustment. Further, since the configuration without the operation dial is realized, it is possible to reduce the adjustment man-hours and prevent an unintended change in the set pressure.

Needless to say, the present invention is not limited to the embodiments described above, and can be variously modified without departing from the present invention. In particular, it can be applied to gas supply to equipment other than the exemplified pneumatic equipment.

1 Pressure regulating valve 10 Main body case 12 Primary port 14 Secondary port 16 1st pipe joint 16a Intake port 18 2nd pipe joint 18a Exhaust port 19 3rd through hole 20 1st flow path 30 On-off valve 31 Valve body 31a Small diameter part 31b Large diameter portion 32 2nd space 33 2nd through hole 34 1st seal 35 2nd seal 36 Valve seat 36a Seat surface 40 Guide member 44 4th space 46 3rd space 48 2nd flow path 50 Flow path component member 52 1st Space 54 First through hole 60 Check valve 62 Biasing member C Central axis

Claims (4)

A pressure regulating valve that adjusts the pressure of gas supplied to an external pneumatic device to a predetermined value.
Cylindrical body case and
A primary port provided at the first end of the main body case and having an intake port connected to an external gas supply source,
A secondary port provided at the second end of the main body case and having an exhaust port connected to the external pneumatic device.
A first flow path that communicates between the intake port and the exhaust port and allows the fluid to pass through,
An on-off valve provided in the middle of the first flow path to open and close the flow path,
A cylindrical guide member provided inside the main body case and having an outer diameter smaller than the inner diameter of the main body case.
A cylindrical flow path constituent member provided inside the guide member and having an outer diameter smaller than the inner diameter of the guide member is provided.
The primary port and the secondary port are arranged so that the central axis of the intake port and the central axis of the exhaust port are coaxial with each other.
The flow path constituent member includes a first space constituting the first flow path at the center in the radial direction, a first through hole communicating the inside and the outside of the first space, and an end portion near the secondary port. Has a seating surface constituting the valve seat of the on-off valve.
The on-off valve has a small diameter portion having a relatively small outer diameter formed closer to the primary port and a large diameter portion having a relatively large outer diameter closer to the secondary port. It has a valve body in which the first seal is externally fitted to the portion and the second seal is externally fitted to the large diameter portion.
The valve body has a second space constituting the first flow path at the center in the radial direction and a second through hole for communicating the inside and the outside of the second space, and the small diameter portion is the guide member. The large diameter portion is arranged so as to be reciprocally fitted in the main body case and reciprocally fitted in the main body case, and the pressure receiving area on the primary port side is the pressure receiving area of the first seal. It is defined by the inner diameter of the seat surface at the abutting position, and the pressure receiving area on the secondary port side is defined by the inner diameter of the main body case at the position where the second seal abuts.
The valve body is further provided with an urging member that urges the valve body in a direction from the primary port toward the secondary port in parallel with the central axis of the intake port and the central axis of the exhaust port.
The third space between the inner surface of the peripheral wall portion of the guide member and the outer surface of the peripheral wall portion of the flow path constituent member is configured as the second flow path.
The second flow path is configured to communicate with the first flow path through the first through hole of the flow path constituent member and the second through hole of the valve body, and the second flow path is configured to communicate with the first flow path on the way. A pressure regulating valve provided with a check valve that allows only flow in the direction from the secondary port to the primary port. The first aspect of claim 1, wherein the valve body is configured such that the ratio of the pressure receiving area on the primary port side to the pressure receiving area on the secondary port side is 1:10 or more. Pressure regulating valve. The pressure regulating valve according to claim 1 or 2, wherein the urging member is arranged in a fourth space between the inner surface of the peripheral wall portion of the main body case and the outer surface of the peripheral wall portion of the guide member. .. The pressure regulating valve according to any one of claims 1 to 3, wherein the external pneumatic device is an actuator, a vacuum generator, or an air blow whose internal pressure is reduced by decompression on the primary port side. ..

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