JPH08312810A - Flow regulating valve - Google Patents

Abstract

PURPOSE: To provide a flow regulating valve which can prevent reverse flow in a moment and assuredly when the reverse flow is generated during flow control and a channel disconnecting period due to the deformation of a rubber tube in a diametral direction, and besides can be formed at a low cost by the use of the existent structure. CONSTITUTION: A plurality of fluid passing openings 14 are peripherally formed to a holding body 9 by which a fixing sheet member 7 arranged on a shaft center in a valve casing 1 is held from a downstream side, and a plurality of reverse flow checking element 19 which can be displaced to open the openings 14 during a positive flow period, and close the openings 14 by receiving reverse flow pressure when reverse flow is generated, are built into and mounted in the valve casing 1 on the downstream side of the holding body 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used by interposing in, for example, water and sewage systems or agricultural waterways.
The elastically deformable tubes concentrically arranged in the cylindrical valve box are deformed in the radial direction by fluid pressure to change the cross-sectional area of the flow path in the valve box to block the flow path and control the flow rate. The present invention relates to a flow rate adjusting valve made.

[0002]

2. Description of the Related Art As a flow rate adjusting valve of this type,
The structure shown in FIGS. 7 and 8 has been known. In FIGS. 7 and 8, 1 is a cylindrical valve box, and annular large-diameter step portions 1a and 1b are formed on the upstream and downstream end faces, that is, both axial end faces. Reference numeral 2 denotes a rubber tube for elastic deformation, which is concentrically arranged inside the valve box 1 so as to face the inner peripheral surface thereof, and has flange portions 2a and 2b formed at both axial ends thereof, respectively. The step portions 1a and 1b on the first side are respectively fitted.
The rubber tube 2 is formed with constrictions 2c and 2d near both ends in the axial direction, and is supplied to the fluid pressure supply / discharge space S formed between the rubber tube 2 and the inner peripheral surface of the valve box 1. As the pressure body (water pressure, air pressure, hydraulic pressure, etc.) P is increased or decreased, the portion 2e from the constricted portion 2c to the constricted portion 2d is configured to be deformable in the radial direction. Reference numerals 3 and 4 denote upstream and downstream annular support members having flange portions 3a and 4a, respectively, and the flange portion 3a of the upstream support member 3 extends from the outside in the axial direction to the upstream flange portion 2a of the rubber tube 2. The valve box 1 is pressed by the bolt 5 while being pressed against the step 1a.
Is fixed to the brim portion 4a of the downstream side support member 4
Also from the outside in the axial direction, the flange portion 2 on the downstream side of the rubber tube 2
It is fixed to the valve box 1 by the bolt 6 in a state where b is pressed against the step portion 1b.

Reference numeral 7 is a bullet-shaped seat member disposed on the axis of the valve box 1, and when the rubber tube 2 is deformed to the maximum inward in the radial direction to cut off the flow path 1A in the valve box. The rubber tube 2 is closely attached to the inner peripheral surface thereof. On the inner peripheral surface of the downstream side support member 4, a plurality of support plates 8 arranged at equal intervals in the circumferential direction are provided so as to be inclined so as to be located radially inward toward the upstream side. The plurality of support plates 8 hold the sheet member 7 from the downstream side to form a holding body 9 together with the downstream side support member 4. 10 and 11 are the above valve boxes 1
Fluid pressure supply and discharge ports to and from the space S, and 12 and 13 are solenoid valves attached to the ports 7 and 8, respectively.

In the flow rate adjusting valve having the above structure, when the fluid pressure P is supplied to the space S between the valve box 1 and the rubber tube 2 via the fluid pressure supply port 10, the rubber tube 2 moves radially inward. Since the fluid Q is deformed and the cross-sectional area of the flow passage 1A in the valve box 1 is changed, the flow rate of the fluid Q is controlled between the rubber tube 2 and the seat member 7, and the plurality of support plates 8
It flows down through the fluid passage opening 14A formed therebetween. Further, the supply amount of the fluid pressure P is increased to increase the deformation of the rubber tube 2 inward in the radial direction, so that the inner peripheral surface of the fixed sheet member 7 is formed as shown by the phantom line in FIG. If it is brought into close contact with the outer peripheral surface, the flow path 1A will be blocked. On the contrary, through the fluid pressure discharge port 11, the valve box 1
When the fluid pressure P is discharged from the space S between the rubber tube 2 and the rubber tube 2, the rubber tube 2 is deformed outward in the radial direction, and as shown by the solid line in FIG. Controlled by.

[0005]

In the conventional flow rate adjusting valve having the above-described structure, since the rubber tube 2 is deformed in the radial direction by the fluid pressure P, during the flow rate control,
For example, when a backflow occurs in the intermediate opening state, this backflow cannot be blocked instantaneously. Further, even when the flow path is blocked, the outer peripheral surface of the rubber tube 2 is only elastically pressed against the sheet member 7. Therefore, when a reverse pressure acts in this blocked state, the reverse flow can be completely prevented. Very difficult.

Therefore, in order to surely and quickly prevent the above-mentioned backflow, it is conceivable to provide a backflow prevention valve or the like in the flow passage on the upstream side in addition to this flow rate adjusting valve. Not only is the cost expensive, but there is the inconvenience of simultaneously operating the flow control valve and the check valve when opening and closing the flow path.

The present invention has been made in view of the above circumstances, and prevents backflow promptly and reliably while effectively utilizing the structure of the existing regulating valve without separately installing a check valve or the like. It is an object of the present invention to provide a flow rate control valve capable of performing.

[0008]

In order to achieve the above object, the present invention provides an elastically deformable tube in a cylindrical valve box with a fluid pressure supply / discharge space formed between the cylindrical valve box and the inner peripheral surface thereof. Are arranged concentrically with each other, and a fixed seat member capable of closely contacting and separating the inner peripheral surface of the elastically deformable tube is arranged on the axis of the valve box, so that the elasticity due to increase / decrease in fluid pressure to the space is increased. In the flow rate control valve configured to change the cross-sectional area of the flow path in the valve box by the radial deformation of the deformation tube, the flow path in the valve box has a plurality of openings for fluid passage in the circumferential direction,
Further, a holding body for holding the fixed seat member from the downstream side is arranged coaxially with the valve box, and each opening of the holding body is opened in the valve box on the downstream side of the holding body at the time of forward flow. When a backflow occurs, a plurality of backflow preventing valve bodies are mounted which are displaced so as to receive the backpressure and close the respective openings of the holder from the downstream side.

In the flow rate adjusting valve having the above-mentioned structure, the holding body has a conical portion that tapers toward the upstream side, and the plurality of openings are formed in the conical portion. It is desirable that a plurality of check valves are formed on a conical seat ring arranged on the downstream side of the holder.

[0010]

According to the present invention, the elastically deformable tube is deformed in the radial direction by increasing or decreasing the fluid pressure in the fluid pressure supply / discharge space between the valve box and the elastically deforming tube, so that The flow rate can be arbitrarily controlled by changing the cross-sectional area, and the inner peripheral surface of the elastically deformable tube is brought into close contact with the outer peripheral surface of the fixed seat member to block the flow passage in the valve box. You can Here, at the time of normal flow of the fluid, the check valve body opens the opening formed in the holding body, and the fluid flows down to the downstream side through the opening. When a backflow occurs during the flow rate control, for example, in an intermediate opening state, the backflow prevention valve body is displaced by receiving the backpressure to close the opening from the downstream side. The backflow can be blocked until the elastically deformable tube comes into close contact with the outer peripheral surface of the fixed sheet member to block the flow path, and further, even in the flow path blocked state by the elastically deformable tube, the backflow prevention valve body. In the same manner, the above-mentioned opening can be closed to surely prevent the backflow.

In particular, as the holding body,
When a cone-shaped part that tapers toward the upstream side is provided and an opening is formed in this cone-shaped part, the back pressure acting on the check valve is increased as it reaches the upstream side of the cone-shaped part. Becomes larger, the closing force of each opening becomes stronger, and the backflow prevention function is more effectively exhibited.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a vertical side view showing a flow rate adjusting valve according to an embodiment of the present invention, respectively.
In these drawings, the same parts as those in the conventional example shown in FIGS. 7 and 8 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIGS. 1 and 2, the holding body 9 is, for example, as shown in FIGS. 3 and 4, an annular base portion 15 arranged coaxially with the valve box 1 and an upstream side surface of the base portion 15. The conical portion 16 which is integrally formed and tapers toward the upstream side, and the base portion 15 of the valve box 1 is brought into pressure contact with the downstream side flange portion 2b of the rubber tube 2 from the outside in the axial direction. It is fitted to the downstream side step portion 1b and fixed to the valve box 1 by bolts 6, and
The sheet member 7 is fitted and held in the holding hole 16a at the tip of the conical portion 16. Further, the conical portion 16
, A plurality of openings 14 are formed at equal intervals in the circumferential direction as holes for passage of the fluid Q.

A conical seat ring 17 made of, for example, a spring material is disposed on the downstream side of the holding body 9, and its outer peripheral portion 17a is located on the downstream annular step portion 1b of the valve box 1. It is fitted and fixed to the valve box 1 by bolts 6. As shown in FIGS. 5 and 6, a plurality of cut portions 18 extending outward in the radial direction at equal intervals in the circumferential direction are formed at the inner peripheral end of the seat ring 17. Each part of the seat ring 17 between the notches 18 is bent toward the upstream side at each root part so that the tip projects obliquely inward in the radial direction. Each part between the notches 18 serves as a tongue-like backflow prevention valve body 19 that is closed from the downstream side to each opening 14 in the holding body 9 during backflow, and is elastically displaceable along the opening / closing direction with respect to the opening 14. It is configured.
At the front end side of the upstream side surface of the check valve body 19 for sealing, a protrusion for sealing 19a that fits into the opening 14 when the valve is closed is provided.
Are integrally formed.

Next, the operation of the flow rate adjusting valve having the above structure will be described. Space S between valve box 1 and rubber tube 2
The basic operation such that the rubber tube 2 is deformed in the radial direction to control the flow rate by increasing or decreasing the fluid pressure P is the same as that of the conventional one. Since the prevention valve body 19 is at the position shown by the solid line in FIG. 2 and the opening 14 is open, the rubber tube 2
The fluid Q passing between the sheet member 7 and the sheet member 7 passes through the opening 14 and flows down to the downstream side. On the other hand, when a reverse flow occurs due to an intermediate opening state or the like, the valve element 19 receives a reverse pressure and
Is elastically displaced to the position indicated by the imaginary line of
Since a is inserted into the opening 14 and closes the opening 14, the backflow is automatically and instantaneously blocked. Further, even when the inner peripheral surface of the rubber tube 2 is in close contact with the outer peripheral surface of the sheet member 7, the above-mentioned back pressure is applied, and the tip projection 19a of the check valve body 19 closes the opening 14. Is completely blocked.

As described above, by simply fixing the seat ring 17 having the check valve element 19 in the existing valve housing 1, the above-mentioned check valve function can be exerted, so that the flow rate can be adjusted. The equipment cost can be significantly reduced as compared with the case where a check valve or the like is provided outside the valve.

As the holding body 9, a conical portion 16
The conical portion 1 as described above, though not limited to those having
In the one provided with 6, in the reverse flow, as it reaches the upstream side,
Since the back pressure acting on the check valve body 19 becomes large, the closing force against the opening 14 is strong, and thus the excellent check function is exerted. Of course, in addition to the conical portion 16, a pyramidal portion may be adopted.

By the way, in the above embodiment, the check valve body 19 is set at a position where the opening 14 is opened in the normal state, and is elastically displaced to close the opening 14 only when the back pressure is applied. However, contrary to this, in the normal state, a spring deformation force is applied to the check valve body 19 so as to close the opening 14 in the normal state, and at the time of forward flow, the spring force is resisted against the spring force. The valve body 19 may be displaced to open the opening 14 and the opening 14 may be held in the closed state by the spring deformation force at the time of backflow. In this case, the backflow prevention function is accelerated and assured. be able to.

[0019]

As described above, according to the present invention, the elastically deformable tube is arbitrarily deformed in the radial direction by increasing / decreasing the fluid pressure in the space for supply and discharge between the valve box and the elastically deformable tube. Not only can the flow path be blocked and the flow rate can be controlled, but a plurality of backflow prevention valve bodies corresponding to a plurality of openings in the circumferential direction of the holder in the valve box on the downstream side of the holder of the seat member. Since it has a built-in configuration, it is not necessary to install a special check valve in the middle of the flow path separately from the flow rate control valve. The backflow prevention valve body can instantaneously close the plurality of openings to prevent backflow quickly and reliably.

In particular, in the case where the holding body has a conical portion that tapers toward the upstream side and an opening is formed in this conical portion, the backflow reaches the upstream side of the conical portion. The back pressure acting on the prevention valve body becomes large, and the closing force of each opening becomes strong, so that the backflow prevention function can be more effectively exerted.

[Brief description of drawings]

FIG. 1 is a front view showing a flow rate adjusting valve according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a flow rate adjusting valve in the embodiment.

FIG. 3 is a vertical sectional side view of a holder that holds a sheet member.

FIG. 4 is a front view showing the same holding body.

FIG. 5 is a vertical side view showing a seat ring.

FIG. 6 is a front view showing the same seat ring.

FIG. 7 is a front view showing a conventional flow rate adjusting valve.

FIG. 8 is a vertical sectional side view showing a conventional flow rate adjusting valve.

[Explanation of symbols]

 1 Valve Box 2 Rubber Tube (Elastic Deformation Tube) 7 Seat Member 9 Holding Body 14 Opening 17 Seat Ring 19 Backflow Prevention Valve Body

Claims (2)

[Claims] 1. An elastically deformable tube is concentrically arranged in a cylindrical valve box so as to form a fluid pressure supply / discharge space between the cylindrical valve box and the inner peripheral surface thereof, and on the axis of the valve box. A fixed sheet member whose inner peripheral surface of the elastic deformation tube is closely contactable and separable is disposed in the inner peripheral surface of the elastic deformation tube by the radial deformation of the elastic deformation tube due to increase / decrease of fluid pressure in the space. In the flow rate control valve configured to change, the flow path in the valve box has a plurality of fluid passage openings in the circumferential direction,
Further, a holding body for holding the fixed seat member from the downstream side is arranged coaxially with the valve box, and each opening of the holding body is opened in the valve box on the downstream side of the holding body at the time of forward flow. A flow control valve having a plurality of backflow prevention valve bodies that are displaceable so as to receive the backpressure when the backflow occurs and close the openings of the holder from the downstream side. 2. The holding body has a cone-shaped portion which is tapered toward the upstream side, and the plurality of openings are formed in the cone-shaped portion, and the holding body is provided on the downstream side of the holder. The flow control valve according to claim 1, wherein the plurality of check valves are formed on the conical pyramidal seat ring.