WO2002012766A1

WO2002012766A1 - Valve device and pipeline system

Info

Publication number: WO2002012766A1
Application number: PCT/JP2001/006828
Authority: WO
Inventors: Hiroshi Yokota; Shingo Yokota
Original assignee: Kabushiki Kaisha Yokota Seisakusho
Priority date: 2000-08-09
Filing date: 2001-08-08
Publication date: 2002-02-14
Also published as: AU2001278702A1

Abstract

A valve device which ensures reliable opening/closing control of pipeline and a stabilized operation such that even when valve opening/closing operation is quickly effected, water hammering, chattering, hunting or the like hardly occurs immediately before valve closing or at the instant of valve opening; and a pipeline system. A valve device having a valve disk adapted to move away from and into contact with a valve seat to open/close a flow path, characterized the mutually associated closure surface regions of the valve disk and valve seat are provided with uneven portions adapted to fitted to each other with a predetermined clearance therebetween in the final stage of valve closing stroke, and the flow path of the clearance between the uneven portions fitted to each other is formed having a shape to bend the direction of travel of the flowing fluid to increase the resistance loss; and a pipeline system characterized by having such valve device inserted therein.

Description

Description Valve equipment and pipeline system Technical field

The present invention relates to a valve device that controls opening and closing of a flow path, and a pipe system using the valve device. Background art

In general, various types of valve devices are widely used in addition to the typical on-off valve as shown in Fig. 12 to open and close the valve port by connecting and disconnecting the valve element to the valve seat in a pipeline. O

By the way, when all of these valve devices are suddenly closed by a rapid valve opening / closing operation etc., the adverse effect is that there is a problem such as so-called chattering and hunting in a mild case and a so-called water hammer in a severe case. Atsuta. Various methods have been proposed in the past to avoid this adverse effect.

In the first conventional method, as shown in Fig. 13, the shape of the valve body 3 is needle-shaped, shell-shaped, V-port-shaped, etc. Is to reduce the amount smoothly. However, although this has some effect, it is not an essential solution. The reason is that if the flow rate is reduced while keeping the smooth flow path shape, the flow velocity tends to increase rather than reducing the impact at the moment of closing the valve to block the flow. The prolonged time to valve closure due to the valve body shape with a large closing stroke was the only cause, and the shock was only moderated. It is self-evident that prolonging the time to valve closure, i.e. closing the valve slowly, alleviates the impact, and that if it is under acceptable use conditions, the valve should be closed slowly. If That's enough, and taking the above measures can be a mere rooftop. The second conventional method is a method in which the valve element is operated in two steps, consisting of a main valve element and a small-diameter auxiliary valve element, and is operated in sequence. There is the same problem as in the first method, because it is to be reduced.

The third conventional method is to accept the shock that occurs when the valve is closed, and then attach a separate shock absorber to the pipeline to mitigate the shock.Although this also has some effect, symptomatic treatment is also available. This is not an essential solution.

As a fourth conventional method, a bypass method has been proposed especially in the semiconductor manufacturing field and the like. That is, as shown in FIG. 14, fluid is supplied to the supply source 3 1—line 3 2—line 3 3—supply source 31 in a loop circulating state, and branch piping is performed from the loop. After taking out the fluid for use point 34, use valve V1 to open or close, or, as illustrated in FIG. 15, install bypass discharge valve V2 in parallel with valve V1. This is a method of opening and closing the valve V1 while partially leaking the fluid in the pipeline from the no-pass discharge valve V2. In the semiconductor manufacturing field and the like, the valve VI may be opened and closed in a short time in order to accurately switch and supply various kinds of chemicals and gases while preventing liquid dripping and mutual mixing. Operated electric, electromagnetic, pneumatic, etc. are often used, in which case the pipeline is damaged by water or a hammer or the like, and the chemical solution or gas is ejected or dust is generated in the pipeline. Such proposals have been made because it is necessary to avoid such situations. In the case of the fourth method, the impact source is suppressed by a loop circuit or a bypass discharge valve, so that the impact is suppressed by 1%. However, the cost of the attached system and the amount of fluid leakage increases. There is.

Therefore, the present invention drastically solves these problems of the prior art, and

容易 Easy maintenance and compact, low cost, reliable control of pipeline opening and closing, ¾ is stable, even if valve opens and closes rapidly, just before or after valve closes Water hammer and chatter at the first moment It is an object of the present invention to obtain a valve device and a pipeline system that are unlikely to cause impact such as hunting. Disclosure of the invention

In order to achieve the above object, the present invention provides a valve device in which a valve element is separated from and opened to a valve seat to open and close a flow path, wherein the valve element and the valve seat correspond to each other at a closed surface portion at the end of a valve closing stroke. Irregularities are provided that fit into each other with a predetermined gap, and a flow path in the gaps of the fitted concaves and convexes is formed in a dog that bends the traveling direction of the flowing fluid to increase resistance loss. It features that.

The front-M3 projection may also serve as a seal when the valve is closed.

Further, the valve seat is formed so as to be able to advance and retreat with respect to a valve box accommodating the valve seat, and at the end of the valve closing stroke, the valve seat receives the valve body while retreating along the traveling direction of the flowing fluid. It may be configured in a structure.

Further, the pipe system may be provided with any one of the valve devices. With these configurations, in the present invention, the control of the opening and closing of the pipeline is performed reliably, and the operation is stable, and even if the valve is rapidly opened and closed, the time immediately before the valve closes and the time when the valve starts to open is controlled. In addition, a valve device and a pipeline system that hardly cause impacts such as water hammer, chattering, and hunting were obtained. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view (partial front view) of a first embodiment of the valve device of the present invention. FIG. 2 is a longitudinal sectional view of a main part of the first embodiment of the valve device of the present invention, showing a fully opened state of the valve.

FIG. 3 is a longitudinal sectional view of a main part of the first embodiment of the valve device of the present invention, showing a valve closed state.

FIG. 4 is a longitudinal sectional view (partially front view) of a main part of a second embodiment of the valve device of the present invention. is there.

FIG. 5 is a longitudinal sectional view (partially front view) of a main part of a third embodiment of the valve device of the present invention.

FIG. 6 is a longitudinal sectional view (partially front view) of a main part of a fourth embodiment of the valve device of the present invention.

FIG. 7 is a vertical sectional view (partially front view) of a main part of a fifth embodiment of the valve device of the present invention.

FIG. 8 is a longitudinal sectional view (partial front view) of a sixth embodiment of the valve device of the present invention. FIG. 9 is a longitudinal sectional view (partial front view) of a seventh embodiment of the valve device of the present invention. FIG. 10 is a longitudinal sectional view (partial front view) of an eighth embodiment of the valve device of the present invention. FIG. 11 is an explanatory diagram of an embodiment of the pipeline system of the present invention.

FIG. 12 is a longitudinal sectional view (partially front view) showing an example of a valve device of the prior art. FIG. 13 is a longitudinal sectional view (partial front view) showing an example of a valve device of the prior art. FIG. 4 is an explanatory diagram showing an example of a pipeline system of a conventional technique.

FIG. 15 is an explanatory diagram showing an example of a conventional pipeline system. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail with reference to the drawings showing examples. In the drawings, common parts are denoted by common reference numerals.

FIG. 1 is an overall view of a first embodiment of a valve device of the present invention, and FIGS. 2 and 3 are main views of the valve device. FIG. 2 is a fully opened state of the valve, and FIG. 3 is a closed state of the valve. It is shown.

In FIGS. 1 to 3, the inside of the valve box 1 of the valve device V, which is interposed in a pipe (not shown), has an outlet flow from the inlet flow path a through the valve port b and the flow path c. There is a channel leading to road d. In this embodiment, the fluid may flow in the direction of d−c → b−a, but there is no problem in operation. The description will be made assuming that it is flowing.

A valve body 3 is disposed facing a valve seat 4 forming a valve port b, and the valve body 3 is mounted on a valve shaft 2 which hermetically penetrates the valve box 1 through a seal portion 8, and When the valve shaft 2 is driven by an appropriate driving device 11, the valve body 3 is configured to be separated from and connected to the valve seat 4 to open and close the valve port b. In addition, as a means for maintaining the sealing when the valve port b is closed, the valve body 3 provided with the seal portion 7 is shown, but it may be provided on the valve seat 4 side, and the seal portion may be provided. May be selected as appropriate. Corresponding closing surfaces of the valve body 3 and the valve seat 4 are provided with concave and convex portions 5 and 6 which are fitted with a predetermined gap at the end of the valve closing process! It is open. The concave and convex portions 5 and 6 have a shape in which the flow path c in the gap between the two when they are fitted into each other repeatedly bends the traveling direction of the flowing fluid in a zigzag shape, thereby increasing the resistance loss. It is formed. In the present embodiment, as a typical example, a shape in which the traveling direction of the flowing fluid is bent a plurality of times in a right angle direction is illustrated, but the angle of each bend may be an angle other than a right angle. The number of turns may be other than the number shown. The location of the uneven portions 5 and 6 is not particularly limited as long as it is on the corresponding closing surfaces of the valve body 3 and the valve seat 4. From the standpoint of ease of manufacture, it is best to form an annular groove on the closed surface and combine it as shown in Figs. Alternatively, a corresponding depression may be formed on the other side. In addition to the method of forming the concavo-convex portions 5 and 6 on the outside of the closing seal portion 7 as shown in the figure, the concavo-convex portions 5 and 6 may be formed on the inside or on both sides.

The operation of the present invention will be described with reference to FIGS. 1 to 3. In the fully opened state shown in FIGS. 1 and 2, the fluid in the pipeline is a → b → c → d At this time, the resistance loss of the uneven portions 5 and 6 is only very small. Next, when the drive device 11 is operated to enter the valve closing stroke, as the valve element 3 approaches the valve seat 4, the concave and convex portions 5 and 6 start to be fitted into each other, and the fitted concave and convex portions 5; The flow path c in the gap of 6 repeatedly bends the traveling direction of the flowing fluid zigzag. Because of this shape, the resistance loss increases rapidly and the flowing fluid decelerates. Therefore, when the valve element 3 is seated on the valve seat 4, the flow-through fluid has already been greatly decelerated, so that the seat can be gently seated without generating an impact such as a water hammer.

By the way, when trying to suddenly stop an object that is moving in the first place, if the timing is matched and the momentum of the rescue body is received while being killed, it can be stopped quickly with less impact. It is easily imagined in consideration of the case, and the basic principle applies to fluids, but when suddenly closing the fluid flowing in the pipe line, it is difficult to use "kill the momentum of movement fluid" in this and the force ^s ¾ Chi "and keep down the flow just prior to the valve closed" it shall not be the same as described above. In other words, if the flow rate is reduced while maintaining the smooth flow path shape, the flow velocity tends to increase rather, and does not contribute much to the elimination of the instantaneous impact of closing the valve that blocks the flow.

On the other hand, in the present invention, instead of "throttling the flow just before the valve is closed", the energy is attenuated by the labyrinth effect just before the valve is closed. The technical idea is clearly different from that of the conventional technology. The labyrinth effect is a phenomenon in which a fluid flowing through a bent gap generates energy loss (resistance loss) due to viscous friction resistance, bending resistance, speed change, and the like. Usually, a multi-stage labyrinth is formed in the axial direction for the purpose of the shaft seal in many cases, and in the labyrinth for the shaft seal, irregularities are formed in order to avoid the difficulty of assembling in the axial direction. In general, they are formed so that there is a gap between the two convex portions without forming a “staggered shape” that fits together. However, in the present invention, the labyrinth (that is, the concave and convex portions 5; 6) is arranged on an opposed flat surface, and the concave and convex portions 5; 6 are sufficiently separated from each other as the valve body 3 approaches the valve seat 4. Because they can be fitted, an ideal "staggered" labyrinth is formed, and thus can exhibit a significant labyrinth effect.

For this reason, in the present invention, not only can the opening and closing control of the pipeline be performed reliably, The operation is stable, and even if the valve opens and closes rapidly, impacts such as water hammer, chattering, and hunting are unlikely to occur immediately before the valve closes or when it opens. In addition, since it is compact and has a small number of parts, it can be easily standardized and manufactured at low cost, and maintenance is easy.

Various shapes other than the above can be considered as the shapes of the concave and convex portions 5 and 6, and FIGS. 4 to 7 illustrate these.

FIG. 4 shows a second embodiment of the present invention, in which the concave and convex portions 5 and 6 are formed as grooves with an oblique slope, and the concave and convex portions are also formed inside the seal portion 7. FIG. 5 shows a third embodiment of the present invention, in which concave and convex portions 5 and 6 are formed in a step-like shape. FIG. 6 shows a fourth embodiment of the present invention, in which the concave and convex portions 5 and 6 themselves (the concave and convex portion 6 in the figure) also have the function of the seal portion when the valve is closed. FIG. 7 shows a fifth embodiment of the present invention, in which the height of the convex portions 5; 6 is changed so that the degree of insertion of the concave portions 5; 6 'is changed even when the valve closing speed is constant. (In the figure, the height of the projections of the projections and depressions 6) is changed stepwise. All other configurations and operation modes are the same as those of the first embodiment, and thus detailed description is omitted.

FIG. 8 shows a sixth embodiment of the present invention, in which the principle of the present invention is applied to a diaphragm valve device often used in the field of semiconductor manufacturing and the like, and an uneven portion 56 is formed. is there. In this case, the uneven portion 5 may be formed integrally with the diaphragm 21 or may be separately mounted.

FIG. 9 shows a seventh embodiment of the present invention. In the first embodiment of the present invention, the pressure of the fluid is received in the direction opposite to the pressure acting direction of the fluid on the valve body 3. However, a balance means for adding at least a part of the working pressure of the fluid related to the valve body 3 is added. That is, the valve shaft 2 is further provided with a pressure receiving plate 22. The pressure receiving plate 22 is attached to the valve box 1 so as to be able to move forward and backward through the seal portion 23. A bag chamber e hermetically sealed between the box 1 and the box 1 is connected to the inlet channel a by the communication path 24. In this embodiment, the pressure receiving plate 2 2 Is set substantially equal to the pressure receiving area of the valve element 3. In the figure, the pressure in the inlet passage a that pushes down the valve body 3 and the internal pressure in the bag chamber e that pushes up the pressure receiving plate 22 are the same pressure. Therefore, the acting force for opening and closing the valve body 3 has no relation to the pressure of the flowing fluid, and the operation of the valve body 3 does not become unstable even when the valve body 3 is installed in an unstable pressure line, and light operation is performed. It operates accurately with force, and does not generate water hammer due to the suction of the valve body 3 to the valve seat 4, and the durability of the valve body 3 and the valve seat 4 is improved. The valve diameter can be increased because the pressure balance means is not affected by the uneven pressure around the valve body 3.

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Regarding the relationship between the pressure receiving area of the valve element 3 and the pressure receiving area of the pressure receiving plate 22, it may be possible to select to cancel only a part of the partial pressure before and after the valve element 3 without completely balancing them. Various settings are possible.

The seal portion 23 between the pressure receiving plate 22 and the -valve box 1 is illustrated as an O-ring type in the figure, but it is a matter of course that other types such as a bellows and a diaphragm may be used. . Regarding the communication passage 24 that communicates the bag chamber e and the inlet flow passage a, it is possible to eliminate the fine flow passage by taking a sufficient inside diameter of the passage, and the fluid passing therethrough cannot flow in one direction. Since the flow goes to a dead end in the bag room e and reciprocates, clogging due to foreign substances such as dust * sand grains and dust is unlikely to occur.

The driving of the valve shaft 2 is exemplified by a manual type. The valve shaft 3 is moved forward and backward by a so-called external screw type driving mechanism that rotates the handle after stopping the rotation of the valve shaft 2. It is designed to open and close.

FIG. 10 shows an eighth embodiment of the present invention, in which a valve seat 4 is formed so as to be able to advance and retreat via a seal portion 25 with respect to a valve box 1 containing it. At the end of the valve closing stroke, the valve seat 4 is configured to receive the valve element 3 while retreating along the traveling direction of the flowing fluid (ie, downward in the figure). The valve seat 4 is moved in the upstream direction (i.e., upward in the figure) by urging means 26 (a compression spring is illustrated in the figure). Direction), and can move within a predetermined range sandwiched between the projections of the valve box 1 or the locking pins. When the valve is fully opened, the valve seat 4 is urged by the urging means 26 to advance to a position where it is biased upstream. Then, at the time of the valve closing movement, from the moment when the valve body 3 comes into contact, the valve body 3 is retracted in the downstream direction (that is, in the downward direction in the figure) in a state of being integrated with the valve body 3, and is decelerated by the urging means 26 and stopped. I do. The stop position may be a position offset in the downstream direction, or a position where the urging force of the urging means 26 and the valve closing force coincide with each other. In any case, the momentary retreat of the valve seat 4 is similar to the momentary pulling of the hand when catching a ball, and the water hammer due to the sudden closing of the fluid is reduced. Things.

The action of reducing the water hammer due to the retreat of the valve seat 4 is combined with the action of reducing the water hammer by the uneven portions 5 and 6 to achieve more accurate operation. As described above, even if 6 is omitted, a certain effect of reducing the water hammer can be obtained. Although not shown, the valve device of the eighth embodiment in which the concave and convex portions 5 and 6 are omitted is also available. Conceivable. The biasing means 26 is more convenient if the biasing force can be adjusted, because the operating mode of the valve device can be adjusted. The biasing force adjustment method can be variously designed according to the prior art, for example, by attaching a screw-type adjusting member, and a detailed description thereof will be omitted. When incorporating the valve device of the present invention into a pipeline system, it is sufficient to simply interpose the pipeline 32 as shown in the embodiment of FIG. When operating this valve device V, even if it is suddenly opened and closed, the impact of a water hammer etc. does not occur, so that deterioration of the pipeline, damage and dust generation are suppressed, and There is no need to install a shock absorbing device, and it is not necessary to take any palliative treatment measures such as opening and closing the valve and leaking fluid from the bypass discharge valve with much time, making it easier to self-inoculate So it is very convenient and economical.

Next, technical matters common to the embodiments will be described. As for the valve type, each figure shows a lift type on-off valve type, but other types of on-off valves (for example, butterfly valve, gate valve, etc.), check valves, automatic control valves, etc. It is effective to widely apply to various types of valves.

In order to further prevent chattering and hunting of the valve body 3, a separate damping means may be additionally provided, and in order to prevent cavitation and the like, comb teeth are provided on the valve body 3 and the valve seat 4. , A sawtooth-shaped projection or a rectifying grid, or the shape of the valve closing surface may be a cone or a curved surface.

As the urging means 26, a compression spring or a tension spring may be appropriately selected, and any type may be used as long as it has the same effect. Instead of the coil spring, another type of spring or elastic member may be used. May be used, or 4 mm may be attached to the spring case. Further, it may be linked to a weight, or a pneumatic or hydraulic device may be applied. Needless to say, the mounting position need not be limited to the illustrated position.

As the driving device 11, an electric, electromagnetic, pneumatic, or hydraulic driving device may be used, or the valve may be manually driven to open and close. In any case, according to the present invention, there is no adverse effect even if the valve is quickly opened and closed.

Regarding the seal member to be attached to each seal part, O-ring, nose, seal, seal ring, diaphragm, bellows, etc. may be applied as appropriate according to the usage conditions, or other elastic members may be attached. If good sealing properties can be maintained by direct contact, the sealing member may be omitted.

The type and shape of the inlet channel a and the outlet channel d of the valve box 1 may be appropriately selected, such as a screw-in type or a flange type, depending on the use conditions. In addition, a strainer or the like may be appropriately provided.

The valve device of the present invention may be installed in a pipe, or may be installed at a pipe terminal and used for discharge. Further, the valve device of the present invention can be applied not only to the case where the flowing fluid is a liquid but also to the case of a gas.

Regarding the practical use of the valve device and the pipeline system of the present invention, the industrial and agricultural It is applicable to all other fields. Further, the combination, arrangement relationship, and mounting position of each component of the valve device and the pipeline system of the present invention need not be limited to the illustrated example, and can be appropriately selected in design. In addition, various design changes are possible within the scope of the present invention, and the present invention is not limited to the above embodiments. Industrial availability

As described above, the present invention has a simple and rational structure, so that the design 'manufacturing' can be easily maintained and compact, the cost is low, the opening and closing control of the pipeline is reliably performed, and the operation is stable. However, even if the valve opens and closes rapidly, a valve device that is unlikely to cause impacts such as water hammer, chattering, and hunting immediately before the valve closes or when the valve starts to open is obtained. Furthermore, by using this valve device, deterioration, breakage and dust generation of the pipeline are suppressed, and there is no need to separately install a shock absorbing device. This eliminates the need for symptomatic treatment, such as leaking air from the bypass discharge valve, and provides an easy and convenient pipe system. Therefore, the present invention has a remarkable effect.

Claims

The scope of the claims

1. In a valve device that opens and closes a flow path by the valve element moving away from and into contact with the valve seat, the valve element and the valve seat are fitted into the corresponding closed surface portions with a predetermined gap at the end of the valve closing stroke. Four convex portions are provided, and the flow path in the gap between the fitted four convex portions is formed in a shape that bends the traveling direction of the flowing turbulent body to increase resistance loss. Valve device.

2. The valve device according to claim 1, wherein the uneven portion also functions as a seal portion when the valve is closed.

3. The valve seat is formed so as to be able to move forward and backward with respect to the valve box housing the valve seat, and at the end of the valve closing stroke, the valve seat receives the valve body while retreating along the traveling direction of the flowing fluid. 3. The valve device according to claim 1, wherein the valve device has a structure.

4. A pipe system comprising the valve device according to any one of claims 1 to 3.