JP4245440B2 - Cage valve - Google Patents

Description

  The present invention relates to a cage valve having a flow control window on a peripheral wall and a cage valve provided with a member for controlling the flow rate of fluid by moving up and down in the cage and controlling the opening area of the flow control window.

  A configuration of a cage valve provided with a conventional valve plug is shown in FIG. FIG. 12 shows a cross section D of FIG. In both figures, the inside of the valve body 1 is divided into an upstream flow path 3 and a downstream flow path 4 by a partition wall 2 which is a partition wall. A cylindrical cage 7 is provided between the upper lid 5 that closes the upper end opening of the valve body 1 and the partition wall 2. A lower end portion of the cage 7 is fitted through a packing 10 in a through hole formed in the center of the partition wall 2. A plurality of flow rate control windows 13 for communicating the upstream flow path 3 and the downstream flow path 4 are formed in the peripheral wall of the cage 7. A valve seat 14 located below the flow control window 13 is formed on the inner peripheral wall surface of the cage 7. A valve plug (valve element) 15 is slidably fitted into the cage 7 along its inner peripheral wall surface.

  The valve plug 15 is a cylindrical body and is attached to the tip of the valve shaft 18. The valve shaft 18 is slidably passed through a packing 21 of a through hole 16 provided in the center of the upper lid 5. As shown in FIG. 12, the valve plug 15 is formed in an approximately elliptical shape, and relative rotation between the cage 7 and the valve plug 15 is restricted. A flow control window 13 is formed at a position deviating from the long axis direction on the peripheral wall of the cage 7 so that the elliptical long axis direction substantially coincides with the flow direction of the fluid flowing in the valve body 1. . A seating portion 19 is provided on the outer peripheral surface of the valve plug 15 so as to correspond to the valve seat 14. The seat portion 19 and the valve seat 14 have an elliptical shape that is substantially the same type as the valve plug 15. FIG. 12 shows a state in which the valve plug 15 is lowered downward and the valve is fully closed. The flow rate control window 13 provided in the cage 7 is completely blocked by the valve plug 15, and the seating portion 19 is seated in close contact with the valve seat 14, so that the upstream side flow path 3 and the downstream side are seated. The flow path 4 is completely closed.

  In the cage valve provided with the elliptical valve plug, the valve shaft 18 is moved up and down by the operation of the drive unit or the manual operation by the automatic control device. When the valve shaft 18 moves up and down, the valve plug 15 moves up and down integrally with the valve shaft 18, and the opening degree of the flow control window 13, that is, the opening area, changes. As a result, the flow rate of the fluid flowing from the upstream channel 3 to the downstream channel 4 through the inside of the cage 7 is controlled. A desired flow characteristic can be obtained by the shape of the flow control window 13 (see, for example, Patent Document 1).

  Although the valve plug has been described as having an approximately elliptical shape, the technique of Patent Document 2 is disclosed as a prior art in which the shape of the valve plug is a perfect circle.

Japanese Utility Model Publication No. 7-21973 JP 2002-106730 A

  Since the cage valve device having the conventional valve plug is configured as described above, the fluid that has flowed into the valve body from the inlet of the valve body passes through a plurality of flow control windows provided in the cage peripheral wall. When flowing into the interior, the fluids flowing in from different flow control windows become jets that collide with each other and collide with the valve plug, but the method of colliding high-speed fluid from the front is not uniform. Therefore, pulsation, vibration, and the like are generated by this collision, so that the operation of the valve plug tends to become unstable. In addition, the occurrence of pulsation and vibration may cause a failure.

  The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a cage valve that can avoid collision of high-speed fluid and can be stably operated with little vibration. There is.

Cage valve according to this invention, the cage having a plurality of windows in a fixed and a peripheral wall on one chamber partitioned by a partition wall for dividing the inside of the valve body on the upstream side and the downstream side, in correspondence with each window Provided with a flow rate regulating door that regulates the flow rate of the fluid flowing into the cage from each window by its opening, the flow rate regulating door has an upper end located above the top of the window, The upper end is pivotally attached to the inner wall of the cage by a hinge mechanism, and as the valve shaft rises, the upper end of the flow restriction door is used as a pivot, and the lower end of the flow restriction door is the upper and lower ends of the flow restriction door. And the lower end of the flow regulating door is at a position lower than the lowermost part of the window within the rotation range.

Cage valve according to this invention, the cage having a plurality of windows in a fixed and a peripheral wall on one chamber partitioned by a partition wall for dividing the inside of the valve body on the upstream side and the downstream side, rotation of the valve shaft A cylindrical valve plug that rotates about the valve shaft while the outer periphery of the cage valve slides on the inner wall surface of the cage valve is provided, and the valve plug is individually downstream of the cage corresponding to each window. A flow channel leading to the side is provided on the outer peripheral surface, and the flow rate of the fluid passing through the flow channel is controlled by the amount of rotation of the valve shaft.

According to this invention, the flow rate regulation door within its pivoting range, since its lower end is located lower than the bottom of each window, directly impinge fluid each other flowing into the cage from the windows facing the Since the vibration generated by the direct collision of the fluids flowing into the cage from the opposing windows can be relieved significantly and the differential pressure can be reduced as in the prior art. The capacity can be increased. The flow rate regulating door has a function of controlling the flow rate, and the flow rate regulating door has a function of regulating the flow direction of the fluid flowing in from the window portion, and one member has two functions.
Also, in the past, the contact surface between the valve plug and the cage slid over a wide range, but the sliding part is almost eliminated, thereby extending the life of the equipment and reducing the frequency of parts replacement and maintenance. Can do.

According to this invention, within the operating range of the flow path regulating member is a valve plug, since its lower end is located lower than the bottom of each window, the fluid with each other which has flowed into the cage from the windows facing the Direct collisions can be avoided, and vibrations caused by direct collision of fluids that flow into the cage from the opposing windows can be greatly reduced and the differential pressure can be reduced. The valve capacity can be increased.
In addition, since the valve shaft is not driven in the vertical direction, the amount of the valve shaft protruding to the outside can be reduced, and the amount of movement in the rotational direction is less than that in the vertical direction. It can be.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of an essential part showing a state in which the valve device according to Embodiment 1 is fully closed. FIG. 2 is a sectional view showing the valve device in a fully opened state. FIG. 3 is a view showing a section B in FIG. 1, that is, when the valve is closed. In FIG. 3, the inside of the valve body 1 is partitioned into an upstream flow path 3 and a downstream flow path 4 by a partition wall 2 that is a partition wall. A cylindrical cage 7 is provided between the upper lid 5 that closes the upper end opening of the valve body 1 and the partition wall 2. The upper lid 5 is fixed to the valve body 1 with bolts 27 and nuts 28. A gasket 20 is fitted between the upper lid 5 and the cage 7, and a gasket 30 is fitted between the cage 7 and the valve body 1. The lower end portion of the cage 7 is fitted into a through hole formed in the center of the partition wall 2 via the gasket 10, and the cage 7 is fixed between the upper end opening 29 of the valve body 1 and the partition wall 2. Two flow rate control windows 13 that allow the upstream flow path 3 and the downstream flow path 4 to communicate with each other are provided on the peripheral wall of the cage 7.

The pin 32 is immovable relative to the cage 7 by a fixing member (not shown). The flow regulating door 31 is fixed to the inner wall of the cage 7 by a hinge mechanism via the fixing member and the pin 32. A flow rate regulating door 31 that is a flow rate regulating member and a flow rate controlling member is rotatable around a pin 32. The curved surface of the cage 7 and the flow restricting door 31 are curved with substantially the same curvature so that the flow restricting door 31 can be brought into close contact with the curved surface of the cylindrical hollow cage 7.
The flow restricting door 31 is connected to the valve shaft 18 via a pin 33, a connecting member 34, and a pin 35 to form a link mechanism. The valve shaft 18 is slidably passed through a packing 21 of a through hole 16 provided in the center of the upper lid 5.

Next, the operation will be described. In the state where the flow regulating door 31 and the cage shown in FIG. 1 are in close contact with each other and are fully closed, when the valve shaft 18 is operated upward by an operation unit (not shown) or manually, the pin 35 is interlocked with the valve shaft 18 and moved upward. To do. Accordingly, the connecting member 34 also moves upward. The flow restricting door 31 moves upward via the pin 33 connected to the connecting member 34, but the flow restricting door 31 forms a hinge mechanism by the pin 32 and the like, and therefore the flow restricting door having the pin 32 as the rotation center. As 31 rotates, the flow regulating door 31 gradually opens. Then, the upstream channel 3 and the downstream channel 4 communicate with each other, and the fluid flows through the flow rate control window 13 toward the opening of the partition wall 2 as indicated by an arrow A in FIG. At that time, the flow direction of the fluid is changed from the radial direction of the cylindrical cage 7 to the direction of the opening of the partition wall 2 by the flow regulating door 31. The flow rate is controlled by the degree of rotation of the flow rate regulating door 31. Even when the flow restricting door 31 is fully opened as shown in FIG. 2, the lower end of the flow restricting door 31 is positioned lower than the lowermost portion of the flow control window 13, thereby restricting the movable range of the valve shaft 18 to ensure fluid flow. The flow direction can be reliably changed to the direction of the communication hole 50 that is the opening of the partition wall 2.
A plurality of flow rate controls from the outer peripheral direction of the cage 7 to the central portion of the fluid flow control doors 31 from the different flow rate control windows 13 facing each other without colliding in the cage from the substantially frontal direction in the same plane. The flow direction of the fluid flowing in from the window 13 is changed to the hole axial direction of the communication hole 50 provided in the partition wall 2. The flow regulating door 31 functions as a flow path changing unit.
Therefore, as in the prior art, vibrations caused by direct collision of fluids that flow into the cage from the respective flow control windows facing each other can be greatly reduced. The flow rate regulating door 31 has a function of controlling the flow rate, and the flow rate regulating door 31 has a function of regulating the flow direction of the fluid flowing in from the window portion, and one member has two functions.
Furthermore, since the fluid flows smoothly, the differential pressure of the valve, which causes energy loss due to the collision, is reduced, and the valve capacity coefficient expressed by the following equation can be set to a large value. That is, the valve capacity can be increased even with casings of the same size.
Cv (valve capacity coefficient) = 1.17Q (G / ΔP) ^1/2
Q = Flow rate (m ³ / hr)
G = specific gravity ΔP = differential pressure (kgf / cm ² )
Conventionally, the contact surface between the valve plug and cage has slid over a wide range, but since the sliding part is almost eliminated, the influence of sliding can be eliminated, thus extending the life of the equipment and the frequency of replacement of parts. In addition, the frequency of maintenance inspections can be reduced. Furthermore, since there are few sliding parts, the part by which processing accuracy is requested | required decreases and manufacturing cost can be reduced.

The inner circumferential cross section of the cylindrical cage 7 has been described as being substantially perfect as shown in FIG. 3, but it may be substantially elliptical as in the prior art document 1.
Alternatively, the cylindrical cage 7 may have a rectangular hole inside the column as shown in FIG. In this case, since the portion where the flow control window 13 is in close contact with the cage 7 may be processed into a flat surface, the processing becomes easy. The hole provided in the cage is not limited to a rectangle, but may be a polygon matching the number of flow control windows.
Moreover, although the case where the number of the plurality of flow control windows 13 is two has been described, the number may be any as long as there is a space for providing a link mechanism inside the cage. The opening position of the flow control window 13 can be changed as appropriate.
Further, by decentering the central axis, it is possible to change the characteristics of a plurality of flow control door link mechanisms, that is, the amount of change in the opening angle of the flow regulating door with respect to the operation amount of the valve shaft. Moreover, since the flow rate flow rate of the flow rate control window 13 facing the upstream flow path and the flow rate restriction window 13 on the opposite side are not the same, the flow rate is different even if the opening angle of the flow rate control window is the same. Therefore, it is possible to change the flow characteristics even if the same flow control window and cage are used by adopting a valve shaft, link mechanism, etc. with an eccentric center shaft and changing the eccentric center shaft for each model. it can. Further, not only the flow rate characteristic but also the maximum flow rate, that is, the valve capacity can be changed by changing the central axis.

Reference Example 1
FIG. 5 is a longitudinal sectional view of a main part showing a state in which the valve device according to the first reference example is fully closed. FIG. 6 is a cross-sectional view showing the valve device in a fully opened state. As in the first embodiment, the interior of the valve body 1 is divided into an upstream channel 3 and a downstream channel 4 by a partition wall 2 that is a partition wall. A cylindrical cage 7 is provided between the upper lid 5 that closes the upper end opening of the valve body 1 and the partition wall 2. Since the upper lid 5, the bolt 27, the nut 28, the packing 16, the gaskets 10, 20, and 30 are the same as those in the first embodiment, the description thereof is omitted. A plurality of flow rate control windows 13 for communicating the upstream flow path 3 and the downstream flow path 4 are formed in the peripheral wall of the cage 7. A valve plug (valve element) 15 is slidably fitted into the cage 7 along its inner peripheral wall surface. The valve plug 15 is formed by a sliding closing part 51 that slides around the flow rate control window 13 and a flow path regulating part 41 provided at the lower end of the sliding closing part 51. The flow path restricting portion 41 has a conical shape with the tip cut off, and the height of the cone with the tip cut off (the height of the cone with the tip cut off in the longitudinal direction of the valve shaft, corresponding to h in FIG. 5). In other words, the flow path restricting portion 41 is longer than the height of the flow rate control window 13.

The valve plug 15 is formed in an approximately elliptical shape as in Patent Document 1, and relative rotation between the cage 7 and the valve plug 15 is restricted.
The valve plug 15 is attached to the tip of the valve shaft 18 by screwing or welding.
The fluid that has flowed into the upstream flow path 3 from the upstream pipe line when the valve is opened flows into the flow control window 13 of the cage 7 and collides with the valve plug 15, causing lateral vibration or vertical vibration. Finally, a rotational force is applied, but the sliding portion of the valve plug 15 and the cage 7 are both formed into an elliptical shape, so that the valve plug 15 and the valve plug 15 are integrally connected thereto. The valve shaft 18 does not rotate.

Next, the operation will be described. In this valve device, when the valve shaft 18 is operated up and down by an operating unit (not shown) or manually, the valve plug 15 moves up and down in the cage 7 accordingly.
When the valve plug 15 is operated so as to move downward in the cage from the fully open upper position where the flow control window 13 is not closed, the flow control window 13 is gradually closed by the valve plug 15 and the flow control window 13 is closed. The flow rate is controlled by the ratio. When the valve plug 15 is further operated downward, the valve plug 15 further closes the flow control window 13 and finally the cage valve is completely closed.
The flow path restricting portion 41 has a plurality of fluids flowing from the opposite flow control windows facing each other at the time of valve opening from the outer peripheral direction of the cage to the central portion without colliding in the cage from the substantially front direction in substantially the same plane. The flow direction of the fluid flowing in from the flow control window is changed to the axial direction of the communication hole 50 provided in the partition wall. The conical channel restricting portion 41 whose tip is cut off functions as a channel changing portion, and the sliding closing portion 51 of the valve plug 15 functions as a flow control member.
Since the flow path restricting portion 41 is in a position lower than the lowermost portion of each window in the operating range of the valve plug, it is possible to avoid a direct collision between fluids flowing into the cage from the facing windows. As in the prior art, vibrations caused by direct collision of fluids flowing into the cage from the opposing windows can be greatly reduced. Further, the valve capacity can be increased as in the first embodiment.
Even if impurities mixed in the fluid pass through the window portion and adhere to the lower part of the cage, the flow path restricting portion is not in close contact with the inner wall of the cage, so that it is caught and no galling occurs.
In addition, since the configuration of the flow path regulating unit is simple, it is not necessary to add a new member that requires machining accuracy.

The position of the flow path control window 13 is set so that the major axis direction of the elliptical peripheral wall of the cage 7 substantially coincides with the direction of fluid flow in the valve body 1, and the peripheral wall of the cage 7 deviates from this major axis direction. Alternatively, the flow control window 13 may be formed. In this case, the fluid does not directly collide with the valve plug 15 and the operation of the valve plug becomes smooth.
For ease of explanation, a structure in which only the sliding closing portion is fully closed has been described. However, a seating portion is provided on the valve plug 15 and a valve seat is provided on the cage 7 so that the seating portion and the valve seat are completely closed. It is possible to achieve a fully closed state more closely by close contact at the time of closing. In that case, it is good also considering a seat part and a valve seat as a perfect circle.
Moreover, although the flow path regulating part 41 has been described as having a conical shape with the tip cut off, the shape thereof can be changed as appropriate, and the flow path resistance can be reduced by changing the shape of the flow path regulating part. Since it changes, the valve capacity, flow rate characteristics, etc. can be changed. Valve capacity, flow rate characteristics, etc. can be easily changed without having to reexamine the structure.

Embodiment 2 FIG .
FIG. 7 is a longitudinal sectional view of an essential part showing a state in which the valve device according to the second embodiment is fully opened. As in the first and second embodiments, the valve body 1 is partitioned into an upstream flow path 3 and a downstream flow path 4 by a partition wall 2 that is a partition wall. A cylindrical cage 7 is provided between the upper lid 5 that closes the upper end opening of the valve body 1 and the partition wall 2. Since the upper lid 5, the bolt 27, the nut 28, the packing 16, the gaskets 10, 20, and 30 are the same as those in the first embodiment, the description thereof is omitted. A plurality of flow rate control windows 13 for communicating the upstream flow path 3 and the downstream flow path 4 are formed in the peripheral wall of the cage 7. A valve plug (valve element) 15 is slidably fitted into the cage 7 along its inner peripheral wall surface. On the outer periphery of the valve plug 15, the same number of vertically long channel grooves 42 as the flow rate control windows 13 are provided to communicate the flow rate control window 13 and the communication holes provided in the partition wall 2 in the opened state.

Next, the operation will be described. In this valve device, when the rotary operation is performed with the valve shaft 18 as a rotation shaft by an operation unit (not shown) or manually, the valve plug 15 rotates in the cage 7 accordingly.
FIG. 8 is a cross-sectional view of FIG. 7 showing the valve device according to the second embodiment in a fully opened state. All surfaces of the flow control window 13 are open to the flow channel 42. Similarly, FIG. 9 shows a state in which the section C has a substantially intermediate opening. Almost half of the flow control window 13 faces the flow channel 42, and the other half of the flow control window 13 is in contact with the sliding surface of the valve plug 15. FIG. 10 is a cross-sectional view C showing the fully closed state. The flow rate control window 13 is not in contact with the flow path groove and is completely closed by the sliding surface of the valve plug 15. When the valve plug 15 is rotated inside the cage 7 from the fully open position where the flow control window 13 does not close the valve plug 15, the flow control window 13 is gradually closed by the valve plug 15 (FIG. 9). The flow rate is controlled by the rate at which the flow rate control window 13 is closed. When the valve plug 15 is further rotated, the valve plug 15 gradually closes the flow control window 13, and finally the cage valve is completely closed (FIG. 10). The channel groove 42 functions as a channel changing unit and a flow rate control member.

In the operating range of the valve plug, it is possible to prevent the fluid flowing into the cage from directly facing each other from colliding with each other, and the fluid flowing into the cage from each facing window as in the past. Vibrations caused by direct collisions can be greatly reduced. Further, the valve capacity can be increased as in the first embodiment.
In addition, since the valve shaft is not driven in the vertical direction, the amount that the valve shaft protrudes to the outside can be reduced, and the amount of movement in the rotational direction is less than that in the vertical direction. It can be.
In addition, by preparing multiple types of cages with different numbers of flow control windows, even if valve plugs with the same flow channel grooves are used, the actual flow of fluids depends on the number of flow control windows of the cage used. Since the number of passage grooves is different and the valves have different flow characteristics and valve capacities, it is possible to easily change the valve capacity, the flow characteristics, etc., using a common member without reexamining the structure.

It is sectional drawing of the cage valve of the closed state which shows Embodiment 1 of this invention. It is sectional drawing of the cage valve of the open state which shows Embodiment 1 of this invention. It is sectional drawing of the cross section B of FIG. 1 which shows Embodiment 1 of this invention. It is sectional drawing of the cross section B of FIG. 1 which shows the modification of Embodiment 1 of this invention. It is sectional drawing of the cage valve of the closed state which shows the reference example 1 of this invention. It is sectional drawing of the cage valve of the open state which shows the reference example 1 of this invention. It is sectional drawing of the cage valve of the open state which shows Embodiment 2 of this invention. It is sectional drawing of the cross section C of FIG. 7 which shows Embodiment 2 of this invention. It is sectional drawing of the cross section C of the intermediate opening which shows Embodiment 2 of this invention. It is sectional drawing of the cross section C at the time of full closure which shows Embodiment 2 of this invention. It is sectional drawing of the open state which shows the cage valve of a prior art example. It is sectional drawing of the cross section D of FIG. 11 which shows the cage valve of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve body 2 Partition wall 7 Cage 13 Flow control window 15 Valve plug 31 Flow control door 41 Flow path control part 42 Flow path groove

Claims (2)

A cage fixed in one chamber partitioned by a partition wall dividing the inside of the valve body into an upstream side and a downstream side and having a plurality of windows on the peripheral wall;
Provided corresponding to each window, provided with a flow rate regulating door for regulating the flow rate of fluid flowing into the cage from each window by its opening degree,
The upper end of the flow restricting door is positioned above the uppermost part of the window, and the upper end of the flow restricting door is pivotally attached to the cage inner wall by a hinge mechanism. The lower end of the flow restricting door rotates in the direction perpendicular to the axis connecting the upper end and the lower end of the flow restricting door with the upper end of the restricting door as the rotation axis, and within the rotation range, The cage valve, wherein a lower end portion of the flow regulating door is at a position lower than a lowermost portion of the window.
valve. A cage fixed in one chamber partitioned by a partition wall dividing the inside of the valve body into an upstream side and a downstream side and having a plurality of windows on the peripheral wall;
Along with the rotational movement of the valve shaft, a cylindrical valve plug that rotates around the valve shaft while the outer periphery slides on the inner wall surface of the cage valve, and
The valve plug has a channel groove on the outer peripheral surface individually leading from the cage to the downstream side corresponding to each window, and the flow rate of the fluid passing through the channel groove is controlled by the amount of rotation of the valve shaft. Cage valve characterized by controlling.

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