JPH07317921A - Valve device - Google Patents

Abstract

PURPOSE:To form no circulation flow in the secondary-side diffusion flow, suppress low pressure loss in a valve in medium and high valve aperture areas, provide high CV value characteristics, cavitation characteristics, low vibration, and low noise characteristics, minimize the port diameter, require sail plug closing force and operation force, enable mounting of a small-size operation device, and prevent rotation of a valve shaft. CONSTITUTION:A vane type guiding part 20 is provided in the internal wall of the secondary side fluid chamber 11 in a valve main body 1 and a fluid 18 to be controlled flowing in the secondary side fluid chamber 11 is thus diverged into the upper stream 21a and the downstream 21b by a fluid flowing hole 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for controlling the flow rate of various controlled fluids, and more particularly to a single-seat contoured valve for controlling the opening and closing of a fluid circulation hole provided in a valve body by advancing and retracting a plug.

[0002]

2. Description of the Related Art Conventionally, various types of valve devices for controlling the flow rate of fluid have been known. These are selected and used according to the type of fluid, temperature, etc. As a single-seat contoured valve in which the flow rate is controlled by a seat ring having a hole and a plug, one having a structure shown in FIG. 10 is known. This single-seat contoured valve includes a valve body 1 and an upper lid 3 attached to a top opening 1a of the valve body 1 by a plurality of bolts 2. The upper lid 3 has a valve plug 5 at its inner end. A shaft 4 is slidably provided through a shaft sealing unit 6. Valve plug 5
Is a cylindrical plug that integrally has a cylindrical guide post portion 5A and a characteristic portion 5B, and the guide post portion 5A is fitted in the upper opening 1a of the valve body 1 and fixed by the upper lid 3. It is slidably supported by the guide 7. A substantially horizontal partition wall 9 is provided at the center of the inside of the valve body 1, and the inside of the valve body 1 is divided into primary and secondary side fluid chambers 10 and 11. Further, a seat ring 12 having a fluid passage hole 13 for communicating the primary side and secondary side fluid chambers 10 and 11 is disposed in the center of the partition wall 9 in correspondence with the valve plug 5. The start end of the secondary side fluid chamber 11 is located above the end of the primary side fluid chamber 10 with the seat ring 13 interposed therebetween, and the valve plug 5 and the plug guide 7 are inserted from above. The seat ring 12 is provided at the fluid circulation hole 13 and the opening edge on the upper surface side, and the seat portion 1 on which the characteristic portion 5B of the valve plug 5 is seated when fully closed.
4 and is screwed into a screw hole 15 provided in the partition wall 9 through a gasket 16. Reference numeral 17 is a gasket.

In the single-seat contoured valve having such a structure, the outer end of the valve shaft 4 is manually moved or moved downward along the plug guide 7 to move the characteristic portion 5B of the valve plug 5 to the seat ring 12. Seat 14
When it is seated on, the fluid circulation hole 13 is closed to be in a fully closed state. Conversely, as shown in the figure, the valve plug 5 is raised along the plug guide 7 and separated from the seat portion 14 to open the fluid circulation hole 13. Then, the controlled fluid 18 in the primary side fluid chamber 10 flows into the secondary side fluid chamber 11 through the gap between the characteristic portion 5A and the seat ring 12, and a desired flow rate control is performed by the upward stroke of the valve plug 5.

[0004]

By the way, the conventional single-seat contoured valve as described above has the following problems. Regarding the primary side fluid chamber 10, although a cage is arranged below the seat ring 13 to prevent the generation of swirling flow and prevent vortexes at the stagnation part, the secondary side fluid chamber 11
With regard to the above, as long as the inner wall surface around the plug has a shape (egg type) which allows the controlled fluid 18 to smoothly flow to the downstream side, it is sufficient that the valve plug 5 and the plug guide 7 can be housed. The reality was that there was only a good degree of recognition, and sufficient consideration was not made. However,
When the secondary side diffusion flow is visualized and observed, it is an extremely complicated diffusion process, and the energy loss process that hinders high volume (CV value) such as wall jet collision, separation, vortex, mixed flow, swirl flow is noticeable. To be In particular, at medium and high valve openings, the flow has a flow pattern in which the flow directly collides from the port (fluid circulation hole 13) toward the plug guide 7 according to the inertial force. As a result, the flow loses its place and undergoes a process of being pushed downstream while vigorously mixing with the fluid being fed one after another. This degree of energy dissipation is large, which causes a high pressure loss. Improvement of secondary side flow and realization of swift and smooth flow pattern are indispensable for realizing high valve capacity (and eventually for small ports). Unsteady phenomena such as valve noise, vibration, cavitation erosion, and valve rotation phenomenon occur. The port diameter is increased in order to increase the valve capacity, but as a result, the plug shutoff force or operating force increases, and it is necessary to mount a relatively large operating device.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to prevent a swirling flow from being generated in the secondary side diffusion flow, and to open the middle and high valve openings. The pressure loss in the valve in the area is suppressed to a low level, and the high CV value characteristic,
It is an object of the present invention to provide a valve device capable of obtaining cavitation characteristics, low vibration and low noise characteristics. Another object of the present invention is to provide a valve device that can reduce the port diameter, has a small plug shutoff force or operating force, and can be mounted with a small-sized operating device. Another object of the present invention is to provide a valve device capable of preventing rotation of a valve shaft. Furthermore, the present invention provides a valve device capable of reinforcing the valve body itself.

[0006]

In order to achieve the above object, the invention according to claim 1 is characterized in that in the secondary side fluid chamber of the valve body, the inside of which is partitioned by a partition wall into primary side and secondary side fluid chambers. In a valve device in which a valve plug for controlling opening and closing of a fluid passage hole provided in a partition wall is arranged to be movable back and forth, a valve body inner wall of the secondary side fluid chamber is provided with a cover that flows into the secondary side fluid chamber from the fluid passage hole. It is characterized in that a guide portion for dividing the control fluid is provided. According to a second aspect of the present invention, a valve plug for opening and closing a fluid passage hole provided in the partition wall is advanced and retracted in the secondary side fluid chamber of the valve body whose interior is partitioned by the partition wall into a primary side and a secondary side fluid chamber. In a movably arranged valve device, open portions are formed at both ends of a cylindrical plug guide into which the valve plug is slidably inserted, at the fluid circulation hole side opening end and in the direction perpendicular to the pipe center line. It is characterized by

[0007]

In the present invention, the guide portion provided in the valve body diverts the controlled fluid flowing into the secondary side fluid chamber from the fluid circulation hole, and causes wall surface jet collision, swirling flow, mixed flow, vortex, etc. Suppress the occurrence. Further, the guide portion reinforces the valve body. The plug guide has an open portion to reduce the fluid resistance and facilitate the flow of fluid. Therefore, wall jet collision, swirling flow,
Prevents the generation of mixed flows and vortices.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 is a sectional view showing a first embodiment of a valve device according to the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.
In the figure, the same components as those of the conventional device shown in FIG. 10 are designated by the same reference numerals, and the description thereof will be omitted. In these drawings, in the present embodiment, a guide portion 20 having a wing-shaped cross section (a V-shape) is integrally provided on the inner wall surface of the valve body 1 on the side of the secondary side fluid chamber 11, whereby the secondary side fluid chamber 11 is provided. Two upper and lower channels, that is, upper channel 11A and lower channel 11B
It is a partition. The front end surface 20a of the guide portion 20 is
It faces the front wall 22 of the inner wall surface of the valve body 1 on the side of the secondary side fluid chamber 11 with a required gap, and has a U-shaped recess 23 in its center to avoid the valve plug 5 and the plug guide 7.
And the rear end 20b is formed at the downstream opening 24 of the valve body 1.
It extends to the vicinity. Therefore, the primary side fluid chamber 10
The controlled fluid 18 that flows into the secondary side fluid chamber 11 through the fluid circulation hole 13 flows in two directions by the guide portion 20.
That is, the gap between the front end face 20a of the guide portion 20 and the inner wall front wall 22 of the valve body 1 and the recess 23 and the valve plug 5
The upper flow 21a flowing through the upper flow path 11A through the gap between
And the lower flow 21b flowing through the lower flow path 11B. The proportion of the fluid flowing through the upper flow passage 11A and the lower flow passage 11B is arbitrary, but in the case of the present embodiment, the amount of fluid flowing through the upper flow passage 11A is approximately 30% of the total amount, and the fluid flowing through the lower flow passage 11B. The amount is about 70%. The other structure is similar to that of the conventional device shown in FIG.

Thus, in the single-seat contoured valve having such a structure, the guide portion 2 is provided in the secondary side fluid chamber 11.
0 is integrally provided, and the controlled fluid 18 is divided into the upper flow 21a and the lower flow 21b, so that the pressure loss of the upstream flow 21a that directly collides toward the plug guide 7 is small,
Further, the lower flow 21b passing through the lower flow passage 11B is diverted in the downstream direction along the inclined lower surface of the front end portion of the guide portion 20, so that the pressure loss is also small, and therefore, the entire middle and high valve opening degrees are obtained. No energy loss process such as wall jet collision, separation, vortex, mixed flow, or swirl flow that prevents high capacity (CV value) is observed in the secondary side diffusion flow, and the flow pattern is swift and smooth. As a result, higher valve capacity (CV
Value) can be realized. In addition, if there are few wall jet collisions, separations, vortices, mixed flows, swirling flows, etc., non-steady phenomena such as valve noise, vibration, cavitation erosion, and valve rotation phenomena do not occur, enabling quiet and stable operation. To Further, as described above, conventionally, the port diameter is made large in order to make the valve capacity large, but in the present invention, since a high valve capacity (CV value) can be realized, the port diameter is made small. It is possible to reduce the plug shutoff force or the operating force. Therefore, it is possible to mount a small operating device. Furthermore, since the guide portion 20 is provided integrally with the valve body 1,
The strength of the valve body 1 itself can be increased.

FIG. 3 is a sectional view showing a second embodiment of the present invention,
FIG. 4 is a sectional view taken along line IV-IV in FIG. In this embodiment, the controlled fluid 18 flows through the upper flow path 11A in an upper flow 21a.
And the lower flow 21b flowing in the lower flow passage 11B, the blade-shaped guide portion 20 is formed in a concave shape in a plan view having a concave portion 30 opening to the downstream side, and its front end, that is, the concave portion 30.
The end opposite to the open end is connected to the front wall 22 of the inner wall surface on the secondary fluid chamber 11 side. The recess 30 is formed to have a width somewhat larger than the outer diameter of the valve plug 5 and to be long in the direction of the center line 33 (fluid flow direction) of the valve body 1, so that the valve in the longitudinal direction of the recess (fluid flow direction). The gap with the plug 5 is set larger than the gap in the width direction (direction orthogonal to the fluid flow direction). Fluids 21a and 21b flowing through the upper flow passage 11A and the lower flow passage 11B
Are 50% in the case of the present embodiment. In addition,
The other structure is similar to that of the first embodiment.

Even in such a configuration, the fluid circulation hole 13
Controlled fluid 18 flowing into the secondary side fluid chamber 11 through the
Is divided into the upper flow 21a and the lower flow 21b by the guide portion 20 to form a smooth flow pattern. Therefore, similar to the above-described embodiment, wall jet collision, separation, vortex, mixed flow, swirl flow, etc. are generated. It is possible to improve the CV value characteristic and prevent unsteady phenomena such as noise, vibration, cavitation erosion, and valve rotation phenomenon.

FIG. 5 is a sectional view showing a third embodiment of the present invention,
FIG. 6 is a sectional view taken along line VI-VI of FIG. In this embodiment, the controlled fluid 18 flows through the upper flow path 11A in an upper flow 21a.
And the lower flow 21b flowing through the lower flow path 11B, the guide portion 40 is configured by a cylindrical projection instead of the blade-shaped guide portion. A pair of guide portions 40 are provided on both sides of the inner wall surface of the valve body 1 so as to be orthogonal to the center line 33 of the valve body 1 so as to face each other with the valve plug 5 interposed therebetween.

Even in such a configuration, the controlled fluid 18 flowing into the secondary fluid chamber 11 is diverted into the upper flow 21a and the lower flow 21b by the guide portion 40 consisting of a pair of protrusions. The same effects as those of the first and second embodiments can be obtained. In this case, if the extending portion 40 ′ extending to the downstream side is integrally extended to the guide portion 40, the above-mentioned airfoil guide portion 20 will be formed.
Since it approximates to, the rectification effect on the controlled fluid 18 can be further increased.

FIG. 7 is a sectional view showing a fourth embodiment of the present invention,
FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7. In this embodiment, instead of providing a guide portion on the inner wall surface of the valve body 1, a cylindrical plug guide 7 into which a valve plug 5 is slidably inserted is inserted.
The open portion 50 is formed at the lower end of the. Open part 50
Are opposed to the lower end opening of the plug guide 7 and both side portions of the valve body 1 in the direction perpendicular to the center line 33.

In such a structure, the plug guide 7
Has an open portion 50, so that the width is small, in other words, the fluid resistance is small, and the fluid easily flows. That is,
As shown in FIG. 9B, in the conventional plug guide 7 having no opening as shown in FIG. 9A, the resistance to the fluid becomes large and the fluid becomes turbulent. In the plug guide 7 having the open portion 50 in the inside, the open portion 50 does not become a resistance against the fluid, so that the fluid flows in the plug guide 7.
Flow on both sides as a phase current. Therefore, the pressure loss is small, and like the first, second, and third embodiments, it is possible to suppress the generation of wall surface jet collision, swirling flow, mixed flow, vortex, and the like. In this embodiment, a guide portion similar to that shown in the first and second embodiments may be added so as to traverse the recess 50 on the side surface of the outer periphery of the plug guide 7 which is orthogonal to the fluid flow direction. It is possible.

[0016]

As described above, according to the valve device of the present invention, the guide portion for diverting the controlled fluid flowing into the secondary side fluid chamber from the fluid flow hole in the inner wall of the valve body of the secondary side fluid chamber. Since the pressure loss of the secondary side diffusion flow is small at the middle and high valve openings, energy loss processes that prevent high volume (CV value) such as wall jet collision, separation, vortex, mixed flow, swirl flow are seen. And a smooth flow pattern can be quickly obtained. As a result, it is possible to realize a high valve capacity (CV value) and, if the occurrence of wall surface jet collision, separation, vortex, mixed flow, swirl flow, etc. is small, valve noise, vibration, cavitation erosion, valve Non-steady phenomena such as rotation phenomenon do not occur, enabling quiet and stable operation. Further, in the past, it was necessary to increase the port diameter in order to increase the valve capacity, but in the present invention, it is possible to realize a high valve capacity (CV value), and therefore to reduce the port diameter. It is possible to reduce the plug shutoff force or the operating force. Therefore, it is possible to mount a small operating device. Furthermore, since the guide portion is provided integrally with the valve body, the strength of the valve body itself can be increased.

Further, according to the present invention, since the open portions are formed at the opening ends of the cylindrical plug guides on which the valve plugs are slidably inserted and on the side of the fluid flow hole side and in the direction perpendicular to the pipe center line, respectively, The fluid resistance of the plug guide with respect to is small, which facilitates the flow of fluid. Therefore, the pressure loss of the secondary side diffusion flow is small, and the wall jet collision, swirling flow, mixed flow,
It is possible to suppress the generation of vortices and the like. As a result, unsteady phenomena such as valve noise, vibration, cavitation erosion, and valve rotation phenomenon do not occur, enabling quiet and stable operation, and reducing the port diameter, plug shutoff force or operation. The force can be reduced and a small operating device can be installed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a valve device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view showing a second embodiment of the valve device according to the present invention.

4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a sectional view showing a third embodiment of the valve device according to the present invention.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view showing a fourth embodiment of the valve device according to the present invention.

8 is a sectional view taken along line VIII-VIII of FIG.

9 (a) and 9 (b) are diagrams showing the flow of fluid by the conventional plug guide and the plug guide of the present invention.

FIG. 10 is a sectional view showing a conventional example of a single-seat contoured valve.

[Explanation of symbols]

1 ... Valve body, 3 ... Top lid, 4 ... Valve shaft, 5 ... Valve plug,
7 ... Plug guide, 9 ... Partition wall, 10 ... Primary side fluid chamber, 1
1 ... Secondary side fluid chamber, 12 ... Seat ring, 13 ... Fluid circulation hole, 20 ... Guide part, 40 ... Guide part, 50 ... Open part.

Claims (2)

[Claims] 1. A valve plug for opening and closing a fluid flow hole provided in the partition wall of the valve body, the interior of which is partitioned into a primary side fluid chamber and a secondary side fluid chamber by a partition wall. In the provided valve device, a guide part is provided on an inner wall of the valve body of the secondary side fluid chamber to divert a controlled fluid flowing into the secondary side fluid chamber from the fluid circulation hole. 2. A valve plug for opening / closing a fluid passage hole provided in the partition wall of the valve body, the inside of which is partitioned into a primary side fluid chamber and a secondary side fluid chamber by a partition wall, is movable back and forth. In the arranged valve device, an open portion is formed at each of the fluid circulation hole side opening ends of the cylindrical plug guide into which the valve plug is slidably inserted and both side portions in the direction perpendicular to the pipe center line. Valve device.