JP2956006B2 - Valve device - Google Patents

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 type valve for controlling opening and closing of a fluid passage hole provided in a valve body by moving a plug forward and backward.

[0002]

2. Description of the Related Art Various types of valve devices for controlling the flow rate of a fluid are known from the prior art, and these are selectively used in accordance with the type and temperature of the fluid. As a single-seat contoured type valve which controls the flow rate with a seat ring having a hole and a plug, the one having the structure shown in FIG. 10 is known. The 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 with a plurality of bolts 2. The upper lid 3 has a valve plug 5 at an inner end thereof. A shaft 4 is slidably provided through a shaft sealing unit 6. Valve plug 5
Has a cylindrical guide post 5A and a characteristic portion 5B integrally, and the guide post 5A is fitted into the upper surface opening 1a of the valve body 1 and fixed by the upper lid 3. It is slidably supported by a guide 7. A substantially horizontal partition 9 is provided at the center of the inside of the valve body 1, thereby partitioning the inside of the valve body 1 into primary and secondary fluid chambers 10 and 11. A seat ring 12 having a fluid communication hole 13 for communicating the primary and secondary fluid chambers 10 and 11 is provided in the center of the partition wall 9 in correspondence with the valve plug 5. The starting end of the secondary fluid chamber 11 is located above the terminal end of the primary 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 on the fluid flow hole 13 and the opening edge on the upper surface side, and the seating 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 via a gasket 16. In addition, 17 is a gasket.

In the single-seat contoured valve having the above-described structure, the outer end of the valve shaft 4 is moved downward along the plug guide 7 by a manual operation or an operating device so that the characteristic portion 5B of the valve plug 5 is seated on the seat ring 12. Seat 14
, The fluid communication hole 13 is closed to be in a fully closed state. On the contrary, as shown in the figure, the valve plug 5 is raised along the plug guide 7 to be separated from the seat portion 14 to open the fluid communication hole 13. Then, the controlled fluid 18 in the primary fluid chamber 10 flows into the secondary fluid chamber 11 from the gap between the characteristic portion 5A and the seat ring 12, and the desired flow rate is controlled by the rising stroke of the valve plug 5.

[0004]

However, such a conventional single-seat contour valve has the following problems. The primary fluid chamber 10 is provided with a cage below the seat ring 13 to suppress the generation of swirling flow and to prevent eddies in the stagnation portion.
It is sufficient that the inner wall surface around the plug has a shape (egg type) in which the fluid 18 to be controlled 18 smoothly flows downstream on the downstream side. The fact was that there was only a good degree of recognition, and that sufficient consideration had not been given. However,
Visualizing and observing the secondary diffusion flow is an extremely complicated diffusion process, and the energy loss process that prevents high capacity (CV value) such as wall jet collision, separation, vortex, mixed flow, and swirling flow is remarkably recognized. Can be In particular, when the valve opening degree is medium or high, the flow follows a flow pattern that directly collides from the port (fluid flow hole 13) toward the plug guide 7 according to the inertia force. As a result, the flow loses its place and undergoes a process of being pushed downstream while being vigorously mixed with the fluid being sent one after another. This degree of energy dissipation is large and causes high pressure loss. In order to increase the capacity of the valve (and thus reduce the number of ports), it is essential to improve the secondary side flow and to achieve a quick and smooth flow pattern. Unsteady phenomena such as valve noise, vibration, cavitation erosion, and valve rotation occur. Although the port diameter is increased in order to increase the valve capacity, the plug shutoff force or the operating force increases as a result, and it is necessary to mount a relatively large actuator.

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 swirl flow from being generated in a secondary-side diffusion flow, and to achieve a medium or high valve opening. Pressure loss in the valve in the region is kept low, high CV value characteristics,
An object of the present invention is 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 capable of reducing the port diameter, having a small plug closing force or operating force, and enabling mounting of 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. Still another object of the present invention is to provide a valve device capable of reinforcing the valve body itself.

[0006]

According to a first aspect of the present invention, there is provided a valve body in which the interior is partitioned by a partition into a primary fluid chamber and a secondary fluid chamber. In a valve device in which a valve plug for controlling opening and closing of a fluid communication hole provided in a partition wall is disposed so as to be able to move forward and backward, a position facing a valve plug side surface of an inner wall of a valve body of the secondary fluid chamber.
And a guide portion for diverting the controlled fluid flowing into the secondary fluid chamber from the fluid flow hole.
According to the second aspect of the present invention, a valve plug for controlling opening and closing of a fluid flow hole provided in the partition in the secondary fluid chamber of the valve body, the interior of which is partitioned into a primary fluid chamber and a secondary fluid chamber by a partition. In the valve device movably disposed, an open portion is formed only at an opening end on a fluid flow hole side of a cylindrical plug guide into which the valve plug is slidably inserted and at both side portions in a direction perpendicular to a pipe center line. It is characterized by having done.

[0007]

In the present invention, the guide portion provided in the valve main body divides the controlled fluid flowing into the secondary fluid chamber from the fluid flow hole, and controls the flow such as wall jet collision, swirling flow, mixed flow, vortex, etc. Suppress the occurrence. The guide also reinforces the valve body. Since the plug guide has an open portion, the fluid resistance is reduced, and the fluid can easily flow. Therefore, wall jet collision, swirl flow,
The generation of mixed flows, vortices, etc. is suppressed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 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 denoted by the same reference numerals, and the description thereof will be omitted. In these figures, in the present embodiment, a guide portion 20 having a wing-shaped cross section is formed integrally on the inner wall surface of the valve body 1 on the side of the secondary fluid chamber 11, whereby the secondary fluid chamber 11 is formed. Are divided into two upper and lower channels, that is, an upper channel 11A and a lower channel 11B.
It is divided into. The front end surface 20a of the guide portion 20
The valve body 1 faces the front wall 22 of the inner wall surface of the secondary fluid chamber 11 on the side of the secondary fluid chamber 11 at a required interval, and has a U-shaped recess 23 at the center thereof to avoid the valve plug 5 and the plug guide 7.
Is formed, and the rear end 20b is connected to the downstream opening 24 of the valve body 1.
It extends to the vicinity. For this reason, the primary fluid chamber 10
The controlled fluid 18 flowing into the secondary fluid chamber 11 through the fluid flow hole 13 flows through the guide portion 20 into two flows,
That is, the gap between the front end face 20a of the guide portion 20 and the front wall 22 of the inner wall surface of the valve body 1 and the recess 23 and the valve plug 5
Flow 21a flowing through the upper flow path 11A through the gap
And a lower stream 21b flowing through the lower channel 11B. Although the ratio of the fluid flowing through the upper flow path 11A and the lower flow path 11B is arbitrary, in the case of this embodiment, the amount of the fluid flowing through the upper flow path 11A is about 30% of the total, and the flow rate through the lower flow path 11B is reduced. The amount is about 70%. The other configuration is the same as that of the conventional device shown in FIG.

Thus, in the single-seat contour type valve having such a configuration, the guide portion 2 is provided in the secondary fluid chamber 11.
0 is integrally provided, and the controlled fluid 18 is divided into the upper stream 21a and the lower stream 21b, so that the pressure loss of the upstream stream 21a which directly collides against the plug guide 7 is small,
Further, the lower flow 21b passing through the lower flow path 11B is changed 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, as a whole, at medium and high valve opening degrees. An energy loss process such as wall jet collision, separation, vortex, mixed flow, and swirl flow that prevents high capacity (CV value) is not observed in the secondary-side diffused flow, and a smooth and smooth flow pattern is obtained. As a result, the capacity of the valve is increased (CV
Value) can be realized. In addition, if there is little occurrence of wall jet collision, separation, vortex, mixed flow, swirling flow, etc., unsteady phenomena such as valve noise, vibration, cavitation erosion, valve rotation phenomenon do not occur, and quiet and stable operation is possible To Further, as described above, conventionally, the port diameter is increased in order to increase the valve capacity. However, in the present invention, it is possible to realize a higher capacity (CV value) of the valve, so that the port diameter is reduced. The plug closing force or the operating force can be reduced. Therefore, it is possible to mount a small operation 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 of FIG. In this embodiment, the controlled fluid 18 flows through the upper channel 21A through the upper channel 11A.
And a lower airflow 21b flowing through the lower flow path 11B, the airfoil-shaped guide portion 20 is formed into a concave shape in plan view having a concave portion 30 opened to the downstream side, and its front end, that is, the concave portion 30 is formed.
Is connected to the front wall 22 of the inner wall surface of the secondary fluid chamber 11 on the side opposite to the open end side. The recess 30 is formed to have a width slightly larger than the outer diameter of the valve plug 5 and to be elongated in the direction of the center line 33 of the valve body 1 (flow direction of the fluid), so that the valve in the longitudinal direction of the recess (flow direction of the fluid). The gap with the plug 5 is set to be larger than the gap in the width direction (the direction orthogonal to the fluid flow direction). Fluids 21a and 21b flowing through upper channel 11A and lower channel 11B
Are set to 50% in this embodiment. In addition,
Other configurations are the same as in the first embodiment.

In such a configuration, the fluid flow holes 13
Fluid 18 flowing into the secondary fluid chamber 11 through the
Is divided into the upper stream 21a and the lower stream 21b by the guide portion 20 to form a smooth flow pattern. Therefore, similarly to the above-described embodiment, generation of wall jet collision, separation, vortex, mixed flow, swirl flow, etc. In addition, it is possible to improve the CV value characteristics and prevent unsteady phenomena such as noise, vibration, cavitation erosion, and valve rotation.

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 channel 21A through the upper channel 11A.
And the guide portion 40 that divides the flow into the lower flow 21b flowing through the lower flow channel 11B is configured by a columnar projection instead of the airfoil guide portion. A pair of the guide portions 40 are provided on both sides of the inner wall surface of the valve main body 1 so as to be orthogonal to the center line 33 of the valve main body 1 so as to oppose the valve plug 5 therebetween.

In such a configuration, the controlled fluid 18 flowing into the secondary fluid chamber 11 is divided into the upper stream 21a and the lower stream 21b by the guide section 40 composed of a pair of projections. The same effects as those of the first and second embodiments can be obtained. In this case, if the guide portion 40 is integrally provided with the extension portion 40 ′ extending downstream, the above-mentioned airfoil guide portion 20
Therefore, the rectifying 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 in FIG. 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 the valve plug 5 is slidably fitted.
An open portion 50 is formed at the lower end of the. Open part 50
Are provided at the lower end opening of the plug guide 7 and on both sides in a direction perpendicular to the center line 33 of the valve body 1.

In such a configuration, 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,
In the conventional plug guide 7 having no opening as shown in FIG. 9A, the resistance to the fluid is increased, and the fluid becomes turbulent, but as shown in FIG. 9B. In the case of the plug guide 7 having the opening portion 50, the opening portion 50 does not become a resistance to the fluid.
Flows on both sides of the. Therefore, pressure loss is small, and similarly to the first, second, and third embodiments, occurrence of wall jet collision, swirling flow, mixed flow, vortex, and the like can be suppressed. In the present embodiment, a guide portion similar to that shown in the first and second embodiments may be added to the outer periphery of the plug guide 7 on the side surface orthogonal to the fluid flow direction so as to cross the recess 50. 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 fluid chamber from the fluid communication hole to the inner wall of the valve body of the secondary fluid chamber. The pressure loss of the secondary side diffused flow is small at medium and high valve opening, and the energy loss process that prevents high capacity (CV value) such as wall jet collision, separation, vortex, mixed flow, swirl flow is seen. And a smooth flow pattern can be obtained quickly. As a result, it is possible to realize a high capacity valve (CV value), and if the occurrence of wall jet collision, separation, vortex, mixed flow, swirling flow, etc. is small, the valve noise, vibration, cavitation erosion, valve Unsteady phenomena such as rotation phenomena do not occur, enabling quiet and stable operation. Further, conventionally, it was necessary to increase the port diameter in order to increase the valve capacity. However, in the present invention, it is possible to realize a higher capacity of the valve (CV value). The plug closing force or the operating force can be reduced. Therefore, it is possible to mount a small operation 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 cylindrical plug guide into which the valve plug is slidably inserted is formed at the opening end on the fluid flow hole side and at both sides in the direction perpendicular to the center line of the pipe, the opening is formed. The fluid resistance of the plug guide to the fluid is small, and the fluid can easily flow. Therefore, the pressure loss of the secondary side diffusion flow is small, and the wall jet collision, swirl flow, mixed flow,
Generation of eddies and the like can be suppressed. As a result, unsteady phenomena such as valve noise, vibration, cavitation erosion, and valve rotation do not occur, enabling quiet and stable operation.Also, the port diameter can be reduced, and the plug closing force or operation can be reduced. The power can be reduced and a small actuator can be mounted.

[Brief description of the drawings]

FIG. 1 is a 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.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

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

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

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 in FIG.

FIGS. 9A and 9B are diagrams showing the flow of fluid by a conventional plug guide and the plug guide of the present invention.

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve body, 3 ... Top lid, 4 ... Valve shaft, 5 ... Valve plug,
7: plug guide, 9: partition, 10: primary fluid chamber, 1
DESCRIPTION OF SYMBOLS 1 ... Secondary fluid chamber, 12 ... Seat ring, 13 ... Fluid flow hole, 20 ... Guide part, 40 ... Guide part, 50 ... Open part.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 1/00-1/54 F16K 47/04

Claims (2)

(57) [Claims] 1. A valve plug for controlling opening and closing of a fluid flow hole provided in the partition in the secondary fluid chamber of the valve body, the interior of which is partitioned into a primary fluid chamber and a secondary fluid chamber by a partition. In the valve device arranged, the secondary fluid chamber has a valve body on an inner wall of a valve body and a valve plug side face.
A guide device for diverting a controlled fluid flowing into the secondary fluid chamber from the fluid flow hole at a position facing the valve. 2. A valve plug for controlling opening and closing of a fluid flow hole provided in the partition in the secondary fluid chamber of the valve body, the interior of which is partitioned into a primary fluid chamber and a secondary fluid chamber by a partition. In the disposed valve device, it is preferable that open portions are formed only at the fluid flow hole side open end of the cylindrical plug guide into which the valve plug is slidably inserted and on both side portions in a direction perpendicular to the pipe center line. Characteristic valve device.