JP3109217U - Butterfly valve - Google Patents

Abstract

A butterfly valve having high sealing performance when the valve is closed is provided.
A pair of upper and lower operation shafts 15 that are perpendicular to the center line of the valve body 14 and that are long in the diameter direction of the valve body 14 are provided on one end face side of the valve body 14 so as to be rotatable. The valve shafts 13 that are spaced apart from each other in parallel are connected by a pair of upper and lower connecting links 16. As a result, when the valve is closed, the outer peripheral portion of the valve body 14 is one of the inner peripheral portions of the valve box 12 in contact with the outer peripheral portion of the valve body 14 in the length direction of the internal flow path 12e. It is pressed from the side. As a result, a sufficient pressing force of the valve body 14 against the opening of the valve box 12 is obtained. Therefore, the airtightness when the butterfly valve 10 is closed is enhanced.
[Selection] Figure 1

Description

  The present invention relates to a butterfly valve, and more particularly to a butterfly valve that increases the sealing performance when the valve is closed.

As a valve for opening and closing a flow path formed inside a tubular body, for example, a butterfly valve of Patent Document 1 is known.
Patent Document 1 discloses a valve box having an internal flow path that can communicate with a flow path of a circular tube, and a disc-shaped valve that is supported by the valve box via a valve shaft so as to be rotatable and opens and closes the internal flow path. With body. Further, the valve shaft is coupled to the valve body via a base that is detachably provided on one end surface side of the valve body by a bolt-nut structure or the like. In addition, the valve shaft has its length direction orthogonal to the center line of the valve body and is directed in the diameter direction of the valve body.

When the valve is closed, the valve body is rotated in the valve closing direction around the valve shaft. Thus, the valve body is closed by gradually rubbing the outer peripheral portion of the valve body against the annular one end of the valve box. Further, when the valve is opened, the valve body is moved away from the annular one end of the valve box by rotating the valve body in the valve opening direction around the valve shaft.
The feature of Patent Document 1 is that when the butterfly valve is disassembled and cleaned, for example, if the pedestal is removed from the valve body, the valve body can be removed from the valve shaft. As a result, a large work of pulling out the long valve shaft from the valve box becomes unnecessary. Therefore, the work time at the time of disassembly and cleaning of the butterfly valve is shortened, and the workability thereof is improved.
Japanese Patent Laid-Open No. 10-19139

However, in Patent Document 1, the valve shaft is coupled to the valve body through the pedestal that is detachable from the valve body. In addition, the length direction of the valve shaft is perpendicular to the center line of the valve body, and the length direction of the valve shaft is oriented in the diameter direction of the valve body. Therefore, even when the valve is fully open, the valve body cannot be rotated up to 90 ° about the valve shaft. As a result, the valve body was a large obstacle (resistor) of fluid in the valve box.
Moreover, since the length direction of the valve shaft is perpendicular to the center line of the valve body and is directed to the diameter direction of the valve body, the valve body is closed around the valve shaft when the valve is closed. The outer periphery of the valve body was gradually rubbed against the opening on one end of the valve box. With such valve closing by rubbing, a sufficient pressing force of the valve body against the opening of the valve box cannot be obtained. Therefore, the airtightness of the internal flow path of the valve body when the valve is closed has been reduced.

  In Patent Document 1, as described above, the valve body rotates in the valve closing direction around the valve shaft, and the outer peripheral portion of the valve body is gradually rubbed against the opening on one end side of the valve box to close the valve. It was a configuration like this. For this reason, the frictional resistance between the outer peripheral portion of the valve body and the opening of the valve box with which the valve body abuts has increased. Therefore, when the butterfly valve has been used for a long period of time, the outer periphery of the valve body and the opening of the valve box may rub against each other and wear. As a result, a gap appears in the seal portion of the internal flow path of the valve box by the valve body, and there is a concern that fluid may leak through the gap.

That is, an object of the present invention is to provide a butterfly valve having high sealing performance when the valve is closed.
Another object of the present invention is to provide a butterfly valve capable of reducing the frictional resistance between the outer peripheral portion of the valve body and a part of the inner peripheral portion of the valve box with which the valve body abuts when the valve is closed.

  The device according to claim 1 is a valve box having an internal flow path that can communicate with a flow path formed inside a tubular body, and is rotatably supported by the valve box via a valve shaft. In the butterfly valve including a valve body that opens and closes the flow path, an operation shaft that is orthogonal to the center line of the valve body and is long in the diameter direction of the valve body is provided on one end surface side of the valve body. The valve shaft is supported so as to be rotatable about the axis of the shaft, and the valve shaft is located on the outer peripheral portion of the operation shaft in the vicinity of the outer side from the inner peripheral surface side of the valve box. The valve shaft is a butterfly valve that is spaced apart in parallel with the axis of the valve shaft, and the valve shaft and the operation shaft are connected by a connecting arm.

According to the first aspect of the present invention, when the valve shaft is rotated in the valve closing direction when the valve is closed, the valve body is connected via the connecting arm and the operation shaft disposed on one end surface side of the valve body. It rotates in the valve closing direction around the valve shaft. At this time, the valve shaft and the operation shaft are connected to each other by a connecting arm while maintaining the axis of each other in a parallel state. In addition, the axis of the operating shaft is orthogonal to the center line of the valve body and is directed in the diametric direction of the valve body, and the valve shaft is on the inner peripheral surface side of the valve box in the outer peripheral portion of the operating shaft. It is arranged closer to the outside.
As a result, when the valve is closed, the outer peripheral portion of the valve body is pressed from one side in the length direction of the internal flow path against the portion of the inner peripheral portion of the valve box that contacts the outer peripheral portion of the valve body. As a result, the pressure of the valve body against the opening of the valve box is sufficiently higher than that of the conventional product in which the outer periphery of the valve body is closed in a state of rubbing against the opening on one end side of the valve box. can get. Therefore, the airtightness of the internal flow path of the valve body when the valve is closed can be improved.

The material, application, and cross-sectional shape of the tube are not limited. For example, a water pipe, a sewer pipe, a gas pipe, etc. are mentioned.
The diameter of the tube is not limited. For example, in the case of a water supply pipe, a small diameter pipe of 150 mm or less may be used. Moreover, the large diameter pipe | tube exceeding 200 mm may be sufficient.
The material, size, shape, etc. of the valve body are not limited. What is necessary is just to be able to rotate around the valve shaft.
The material, size, shape, etc. of the valve box are not limited. It suffices if an internal flow path for fluid is formed inside the valve box and the valve body can be accommodated in the internal flow path.

The operation shaft is provided on one end face side of the valve body, and the axis of the operation shaft is orthogonal to the center line of the valve body and is directed in the diameter direction of the valve body. The material, length, thickness, number of operation shafts, etc. are not limited.
The valve shaft is provided outside the one end face side of the valve body, and is provided to be rotatable with respect to the valve box. The material, cross-sectional shape, thickness, etc. of the valve stem are not limited.
The material, length, shape, number of use, etc. of the connecting arm are not limited. It is sufficient if the valve shaft and the operation shaft can be connected.
The connecting arm and the valve shaft are fixed. Further, the connecting arm and the operation shaft may be fixed, or may be pivotally supported.

  The invention according to claim 2 is such that a convex spherical surface processing is applied to the outer peripheral portion of the valve body, and the inner peripheral portion of the valve box is in contact with the outer peripheral portion of the valve body when the valve is closed. Is the butterfly valve according to claim 1, which is tapered.

  According to the second aspect of the present invention, the outer peripheral portion of the valve body is subjected to convex spherical processing (chamfering) and the contact portion of the outer peripheral portion of the valve body in the inner peripheral portion of the valve box. Since the taper is applied, even if the outer periphery of the valve body comes into contact with the tapered processing part of the inner periphery of the valve box when the valve is closed, the outer periphery of the valve body is brought into contact with the taper. The frictional resistance with the inner periphery of the valve box is small. As a result, even when the butterfly valve is used for a long period of time, there is little wear between the outer periphery of the valve body and the inner periphery of the valve box, and when the valve is closed, the sealing performance of the internal flow path of the valve box by the valve body is improved. be able to.

  According to this device, on the one end surface side of the valve body, an operation shaft that is orthogonal to the center line of the valve body and that is long in the diameter direction of the valve body is rotatably provided. Since the valve shafts separated in parallel are connected by the connecting link, when the valve is closed, the outer periphery of the valve body is in contact with the outer peripheral part of the valve body in the inner peripheral part of the valve box. The part is pressed from one side in the length direction of the internal flow path. Thereby, the pressing force of the valve body with respect to the opening of the valve box is sufficiently obtained. As a result, it is possible to improve the sealing performance when the valve is closed.

  In particular, according to the invention described in claim 2, a convex spherical surface is applied to the outer peripheral portion of the valve body, and a taper process is applied to the contact portion of the outer peripheral portion of the valve body, of the inner peripheral portion of the valve box. As a result, when the valve is closed, the frictional resistance between the outer peripheral portion of the valve body and the inner peripheral portion of the valve box in contact with the valve body can be reduced. As a result, there is little abrasion between the outer peripheral part of the valve body and the inner peripheral part of the valve box, thereby improving the sealing performance of the internal flow path of the valve box by the valve body.

  Hereinafter, embodiments of the present invention will be specifically described. Here, for convenience of explanation, one of the length directions of the internal flow path of the valve box which is the body of the butterfly valve is X1 direction, the other of the length direction of the internal flow path is X2 direction, and the length direction of the internal flow path One side of the valve box that is orthogonal to the Y1 direction, the other side of the valve box that is orthogonal to the length direction of the internal flow path is the Y2 direction, the upper part of the valve box is the Z1 direction, and the lower part of the valve box is the Z2 direction. .

  1 and 2, reference numeral 10 denotes a butterfly valve according to Embodiment 1 of the present invention. A valve box 12 having 12e, and a valve body 14 that is rotatably supported by the valve box 12 via a valve shaft 13 and opens and closes the internal flow path 12e. Further, on one end surface side (X1 side) of the valve body 14, a pair of upper and lower operation shafts 15 that are orthogonal to the center line of the valve body 14 and that are long in the diameter direction of the valve body 14 are connected to the axis of the operation shaft 15. It is supported so as to be rotatable about the center. The valve shaft 13 is arranged in the outer periphery of the operation shaft 15 in the vicinity of the outer side from the inner peripheral surface side of the valve box 12 so that the axis of the operation shaft 15 and the axis of the valve shaft 13 are parallel to each other. Yes. Further, the valve shaft 13 and the operation shaft 15 are connected by a pair of upper and lower connecting arms 16.

Hereinafter, the butterfly valve 10 will be described in detail.
As shown in FIGS. 1 to 5, the valve box 12 is a cylindrical body having a short length. Of the inner peripheral portion of the valve box 12, the portion 12 a that comes into contact with the outer peripheral portion of the valve body 14 when the valve is closed, specifically, the end portion on the X1 side of the inner peripheral portion of the valve box 12 is closer to the X1 direction. Taper processing is performed to gradually reduce the diameter (FIG. 5).
At the upper and lower ends of the valve box 12, a pair of shaft support portions 12b for supporting the valve shaft 13 so as to be rotatable about its vertical axis are integrally projected. Both shaft support portions 12b are formed with shaft holes 12c each having an axis that is moved in parallel with the width d (FIG. 4) in the Y2 direction with respect to a perpendicular perpendicular to the axis of the valve box 12. A pair of upper and lower metal bushes 17 are inserted into the shaft hole 12c of the upper shaft support portion 12b from the middle portion in the length direction to the lower end portion thereof so as to be separated from each other. A set of five packings 18 is inserted into the upper end portion of the shaft hole 12c of the upper shaft support portion 12b. Each packing 18 is pressed from above by a cylindrical gland 20 via a gland bush 19. Thereby, each packing 18 is positioned within the shaft hole 12c. In addition, through holes 19a and 20a whose length direction is the Z1-Z2 direction are formed in the central portions of the ground bush 19 and the ground 20, respectively. The valve shaft 13 is inserted into the through holes 19a and 20a in series.

A thick flange 12d that is rectangular in a plan view is integrally formed at the upper end of the upper shaft support 12b. On the upper surface of the flange 12d, both end surfaces on the X1-X2 side are opened, and a rectangular frame-shaped stand 21 that is long in the Y1-Y2 direction is attached. The ground 20 is disposed in the internal space of the stand 21. An insertion hole 21 a for the ground bush 19 is formed at the center of the lower frame plate of the stand 21. In addition, an insertion hole 21 b of the valve shaft 13 is formed at the center of the upper frame plate of the stand 21.
A rectangular gear box 22 is fixed to the upper surface of the upper frame plate of the stand 21 in a plan view where the upper end of the valve shaft 13 is connected. On the side plate in the Y2 direction of the gear box 22, an operation rod 24 having an annular handle 23 at the tip protrudes from the central portion in the Y2 direction. When the handle 23 is rotated, the gears in the gear box 22 are rotated via the operation rod 24, whereby the valve shaft 13 is rotated in a predetermined direction.

A portion of the valve shaft 13 disposed in the internal flow path 12e of the valve box 12 is fixed to an upper end portion and a lower end portion thereof with one end portions (tip portions) of both connecting arms 16 being separated from each other. Has been. Both connecting arms 16 are thick arms parallel to each other long in the Y1-Y2 direction in FIG. At both ends in the length direction of both connecting arms 16, shaft holes 16a and 16b whose length direction is directed in the vertical direction are formed. A shaft hole 16 a on one end side of both connecting arms 16 serves as an insertion hole for the valve shaft 13. A shaft hole 16 b on the other end side of both connecting arms 16 serves as an insertion hole for the corresponding operation shaft 15. The separation distance between the two connecting arms 16 is always determined by the arm positioning stopper plate 37 fixed between the two connecting arms 16 at the Y2 side end of the valve shaft 13 and a pair of keys 38 in FIG. Is held constant.
A pair of upper and lower metal bushes 17 are inserted into the shaft hole 12c of the lower shaft support portion 12b from the upper end portion to the lower end portion of the shaft hole 12c. A lower cover 36 is provided at the lower end portion of the shaft hole of the lower shaft support portion 12b.

  The valve body 14 is a thick disk, and its outer peripheral part is spherically processed into a semicircular cross section (FIG. 5). A pair of upper and lower operation shafts 15 are arranged on the surface side of the valve body 14 in the X1 direction. Both operating shafts 15 are bolt-shaped shafts, and their axes are orthogonal to the center line of the valve body 14 and coincide with the diameter direction (vertical direction) of the valve body 14. In addition, a pair of upper and lower shaft support pieces 26 that support the upper operation shaft 15 is provided on the upper portion of the valve body 14 on the surface side in the X1 direction so as to protrude apart from each other in the Z1-Z2 direction. Similarly, a pair of upper and lower shaft support pieces 26 that support the lower operation shaft 15 are provided at the lower portion on the surface side in the X1 direction of the valve body 14 so as to protrude apart from each other in the Z1-Z2 direction. Yes.

  Each shaft support piece 26 is formed with a shaft hole 26a into which the corresponding operation shaft 15 is inserted. The distance between each pair of shaft support pieces 26 is slightly longer than the length of the corresponding connecting arm 16 in the width direction. When inserting both the operation shafts 15 between the shaft support pieces 26, first, the other end portions (original portions) of the connection arms 16 are respectively arranged between the shaft support pieces 26. Thereafter, one of the operation shafts 15 is inserted into the corresponding pair of upper and lower shaft holes 26 a and the shaft hole 16 b of the connecting arm 16 with the tips of the operation shafts 15 facing each other. Thereby, the valve body 14 and the valve shaft 13 are connected via the pair of operation shafts 15 and the pair of connection arms 16. At this time, the split washer 27 is inserted into the tip of the threaded portion of the two operating shafts 15 and the nut 28 is screwed together.

Next, the operation of the butterfly valve 10 according to Embodiment 1 of the present invention will be described.
When the valve is closed, when the handle 23 is rotated in the valve closing direction, each gear in the gear box 22 is rotated via the operation rod 24, and the valve shaft 13 is rotated in the valve closing direction. As a result, the valve body 14 rotates in the valve closing direction about the valve shaft 13 via the connecting arm 16 and the operation shaft 15 arranged on one end surface side of the valve body 14. At this time, the valve shaft 13 and the operation shaft 15 are connected to each other by the connecting arm 16 while keeping their axis lines in parallel. Moreover, the axis of the operating shaft 15 is directed in the diameter direction of the valve body 14 in a state orthogonal to the center line of the valve body 14. The valve shaft 13 is arranged in the vicinity of the outer side of the outer peripheral portion of the operation shaft 15 from the inner peripheral surface side of the valve box 12.
As a result, when the valve is closed, the outer peripheral portion of the valve body 14 is on one side in the length direction of the internal flow path 12e with respect to the portion of the inner peripheral portion of the valve box 12 that contacts the outer peripheral portion of the valve body 14. Is pressed from. As a result, the pressing force of the valve body 14 against the opening of the valve box 12 is lower than that of the conventional product in which the outer periphery of the valve body is closed in a state of rubbing against the opening on one end side of the valve box. Fully obtained. Therefore, the airtightness of the internal flow path 12e of the valve body 14 at the time of valve closing can be improved.

  Further, the outer peripheral portion of the valve body 14 is subjected to convex spherical processing. Moreover, a taper process is applied to the contact portion 12 a of the outer peripheral portion of the valve body 14 in the inner peripheral portion of the valve box 12. As a result, when the valve body 14 is closed, the outer peripheral portion of the valve body 14 is brought into contact with the outer peripheral portion of the valve body 14 even if the outer peripheral portion of the valve body 14 comes into contact with the tapered portion of the inner peripheral portion of the valve box 12. The frictional resistance with the inner peripheral part of the valve box 12 becomes small. As a result, even when the butterfly valve 10 is used for a long period of time, there is little wear between the outer periphery of the valve body 14 and the inner periphery of the valve box 12, and the internal flow path of the valve box 12 by the valve body 14 when the valve is closed. The sealing property of 12e can be improved.

  When the valve is opened, the handle 23 is rotated in the valve opening direction. Thereby, each gear in the gear box 22 rotates via the operation rod 24, and the valve shaft 13 rotates in the valve opening direction. Therefore, the valve body 14 rotates in the valve opening direction around the valve shaft 13 through the connecting arm 16 and the operation shaft 15 disposed on one end surface side of the valve body 14 and is opened.

It is a longitudinal cross-sectional view which shows the use condition which cut | disconnected some butterfly valves which concern on Example 1 of this invention. It is a side view which shows the use condition of the butterfly valve which concerns on Example 1 of this invention. It is a principal part expansion perspective view which shows the attachment structure of the valve body to the valve shaft of the butterfly valve which concerns on Example 1 of this invention. It is a horizontal expanded sectional view of the butterfly valve concerning Example 1 of this device. It is a principal part expanded sectional view which shows the seal part of the valve case and a valve body at the time of valve closing of the butterfly valve concerning Example 1 of this invention.

Explanation of symbols

10 butterfly valve,
11 tube,
11a flow path,
12 Valve box,
12a A part that contacts the outer periphery of the valve body,
12e internal flow path,
13 Valve stem,
14 Disc,
15 operation axis,
16 Connecting arm.

Claims (2)

A valve box having an internal flow path capable of communicating with the flow path formed inside the tubular body;
In the butterfly valve comprising a valve body that is rotatably supported by the valve box via a valve shaft and opens and closes the internal flow path,
On one end surface side of the valve body, an operation shaft that is orthogonal to the center line of the valve body and that is long in the diameter direction of the valve body is supported rotatably about the axis of the operation shaft,
The valve shaft is arranged in an outer peripheral portion of the operation shaft in the vicinity of the outer side from the inner peripheral surface side of the valve box so that the axis of the operation shaft and the axis of the valve shaft are parallel to each other,
A butterfly valve in which the valve shaft and the operation shaft are connected by a connecting arm. The outer periphery of the valve body is subjected to convex spherical processing,
The butterfly valve according to claim 1, wherein a portion of the inner peripheral portion of the valve box that comes into contact with the outer peripheral portion of the valve body when the valve is closed is tapered.

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