JP2021134883A - Butterfly valve - Google Patents

Abstract

To provide a butterfly valve which enables improvement of long time water cut-off performance.SOLUTION: A butterfly valve 1 is a butterfly valve of a two-way valve and includes a valve box 11, a valve stem 12, a valve body 13, and an elastic member 14. The valve box 11 has a through hole 21 forming a passage. The valve stem 12 is rotatably supported by the valve body 11. The valve body 13 is provided at the through hole 21 and rotates in conjunction with rotation of the valve stem 12. The elastic member 14 is disposed fitting in an outer peripheral end surface 42 of the valve body 13 and may contact with an inner peripheral surface 26 of the through hole 21.SELECTED DRAWING: Figure 2

Description

The present invention relates to a butterfly valve.

Conventionally, butterfly valves have been used to open and close pipes in chemical factories, water and sewage systems, agriculture, fisheries, etc. The butterfly valve has a structure in which water is stopped by the contact surface pressure generated by compressing the seat ring on the outer peripheral surface of the valve body (see, for example, Patent Document 1).

The seat ring of Patent Document 1 is formed in a ring shape so as to cover the inner peripheral surface of the through hole formed in the valve box and both end faces of the valve box in which the opening of the through hole is formed.

Japanese Patent No. 2000-337547

However, since the seat ring covers the inner peripheral surface and both end surfaces of the through hole, the volume becomes large, and compression set is likely to occur due to a compressive load that is pushed out from the valve body when closed, resulting in cold heat. When the environment was repeated, the long-term water stopping performance may deteriorate.

An object of the present invention is to provide a butterfly valve capable of improving long-term water stopping performance.

In order to achieve the above object, the butterfly valve according to the first invention is a two-way valve butterfly valve, which includes a valve box, a valve stem, a valve body, and an elastic member. The valve box has a through hole forming a flow path. The valve stem is rotatably supported by the valve box. The valve body is provided in the through hole and rotates with the rotation of the valve stem. The elastic member is fitted and arranged on the outer peripheral surface of the valve body, and can come into contact with the inner peripheral surface of the through hole.

In this way, the elastic member can be fitted and arranged on the outer peripheral surface of the valve body to stop water between the elastic member and the inner peripheral surface of the valve box. As a result, the volume of the elastic member can be reduced, so that compression set is less likely to occur, and long-term water stopping performance can be improved even when the cold environment is repeated.

The butterfly valve according to the second invention is the butterfly valve according to the first invention, and the valve body has a valve stem hole through which the valve stem is inserted. The outer peripheral surface of the valve body has a valve rod hole peripheral portion provided around each of the two openings of the valve rod hole, and a valve blade portion provided between the valve rod hole peripheral portions. The elastic member has a first elastic portion arranged along the valve blade portion and a second elastic portion arranged in an annular shape around the valve stem hole. The valve wing portion has a first fitting recess that fits with the first elastic portion. The first elastic portion has a first outer convex portion protruding from the outer peripheral surface and a first fitting convex portion that can be fitted into the first fitting concave portion. The valve rod hole peripheral portion has a second fitting recess that fits with the second elastic portion. The second elastic portion has a second outer convex portion protruding from the outer peripheral surface and a second fitting convex portion that can be fitted into the second fitting concave portion.

In this way, the first elastic portion can be fitted and arranged on the valve blade portion on the outer peripheral surface of the valve body, and the second elastic portion can be fitted and arranged on the peripheral portion of the valve rod hole.

The butterfly valve according to the third invention is the butterfly valve according to the second invention, and the first fitting recess has a first space and a second space. The first space is provided toward the inside in the radial direction of the valve body. The second space protrudes from the inner wall surface of the first space. The first fitting convex portion has a first convex portion and a second convex portion. The first convex portion is arranged in the first space. The second convex portion protrudes from the first convex portion and is arranged in the second space.

By forming the first fitting concave portion and the first fitting convex portion in this way, it is possible to prevent the first elastic portion from coming off from the valve body when opening and closing the flow path.

The butterfly valve according to the fourth invention is the butterfly valve according to the second or third invention, and the first outer convex portion has a first tip portion and a first base end portion. The first tip portion is curved convexly toward the radial outer side of the valve body. The first base end portion is provided between the first tip portion and the first fitting convex portion. The width of the first base end portion is formed to be equal to or larger than the width of the first tip end portion.

By providing the tip portion that is convexly curved toward the outer side in the radial direction of the valve body in this way, it is possible to prevent stress concentration when the valve body comes into contact with the valve box.

Further, by providing the first base end portion having a width equal to or larger than the width of the first tip portion, the rigidity can be ensured, and the misalignment of the first elastic portion at the time of opening and closing can be suppressed.

The butterfly valve according to the fifth invention is the butterfly valve according to any one of the second to fourth inventions, and the first elastic portion is in the width direction of the first outer convex portion so as to be along the outer peripheral surface. It has a convex portion on the surface protruding from both side surfaces.

As a result, the fluid moves along the convex portion on the surface, so that the influence of the fluid pressure can be reduced, and the first elastic portion can be prevented from coming off from the valve blade portion at the time of opening and closing.

The butterfly valve according to the sixth invention is the butterfly valve according to any one of the second to fifth inventions, and the second fitting recess has a third space and a fourth space. The third space is provided toward the inside in the radial direction of the valve body. The fourth space protrudes from the inner wall surface of the third space. The second fitting convex portion has a third convex portion and a fourth convex portion. The third convex portion is arranged in the third space. The fourth convex portion protrudes from the third convex portion and is arranged in the fourth space.

By forming the second fitting concave portion and the second fitting convex portion in this way, it is possible to prevent the second elastic portion from coming off from the valve body when opening and closing the flow path.

The butterfly valve according to the seventh invention is the butterfly valve according to the first or second invention, and the second outer convex portion has a second tip portion and a second base end portion. The second tip is convexly curved toward the radial outer side of the valve body. The second base end portion is provided between the second tip end portion and the second fitting convex portion. The width of the second base end portion is formed to be equal to or larger than the width of the second tip end portion.

By providing the tip portion that is convexly curved toward the outer side in the radial direction of the valve body in this way, it is possible to prevent stress concentration when the valve body comes into contact with the valve box.

Further, by providing the second base end portion having a width equal to or larger than the width of the second tip portion, the rigidity can be ensured, so that the misalignment of the second elastic portion at the time of opening and closing can be suppressed. ..

The butterfly valve according to the eighth invention is the butterfly valve according to any one of the first to seventh inventions, and the inner peripheral surface of the through hole includes a contact surface, a first connection surface, and a second connection surface. Have. The elastic member comes into contact with the contact surface when the flow path is closed. The first connecting surface connects between the edge of one opening of the through hole and the contact surface. The second connecting surface connects between the other opening of the through hole and the contact surface. The first connecting surface is inclined or curved so as to be inward in the radial direction of the through hole toward the contact surface. The second connecting surface is inclined or curved so as to be inward in the radial direction of the through hole toward the contact surface.

As a result, when the flow path is closed, the elastic member comes into contact with the inner peripheral surface of the valve box at the contact surface, and the first elastic portion does not come into contact with the first connection surface and the second connection surface. The contact area of the elastic portion can be reduced and the frictional resistance can be reduced. Therefore, it is possible to reduce the torque during operation.

The butterfly valve according to the ninth invention is the butterfly valve according to any one of the inventions 1 to 8, further comprising a sealing member arranged around the opening of the through hole of the valve box.

This makes it possible to prevent fluid from leaking between the connected pipe and the butterfly valve.

According to the present invention, it is possible to provide a butterfly valve capable of improving long-term water stopping performance.

The perspective view of the butterfly valve in embodiment according to this invention. FIG. 1 is a partial cross-sectional view of the front surface of the butterfly valve of FIG. FIG. 1 is a partial cross-sectional view of the side surface of the butterfly valve of FIG. (A) Partial cross-sectional view of the plane of the butterfly valve of FIG. 1, (b) Enlarged view of part A of FIG. 4 (a). The perspective view which shows the valve body of FIG. FIG. 5A is a cross-sectional view taken along the line between CC'in FIG. 5, and FIG. 5B is a cross-sectional view taken along the line FF'in FIG. The perspective view of the elastic member of FIG. FIG. 5 is a perspective view showing a state in which the elastic member of FIG. 7 is attached to the valve body of FIG. FIG. 7A is a cross-sectional view taken along the line between HH'in FIG. 7 and FIG. 8B is a cross-sectional view taken along the line JJ'in FIG. FIG. 7A is a cross-sectional view taken along the line II'in FIG. 7, and FIG. 8B is a cross-sectional view taken along the line KK'in FIG. (A) A schematic view showing an open / closed state of a flow path, (b) an enlarged view of part L of FIG. 11 (a).

The butterfly valve 1 according to the embodiment of the present invention will be described with reference to the drawings.

<Structure>
(Overall configuration of butterfly valve)
FIG. 1 is a perspective view showing the appearance of the butterfly valve 1 according to the present embodiment. FIG. 2 is a partial cross-sectional view of the front surface of the butterfly valve 1. FIG. 3 is a partial cross-sectional view of the side surface of the butterfly valve 1.

The butterfly valve 1 of the present embodiment is a two-way valve that opens and closes a flow path through which a fluid flows in one direction.

The butterfly valve 1 of the present embodiment includes a valve box 11, a valve rod 12, a valve body 13, and an elastic member 14.

The valve box 11 is formed with a through hole 21 that forms a flow path. The valve stem 12 is arranged across the through hole 21 and is rotatably supported by the valve box 11. The valve body 13 has a valve rod hole 41 inserted through the valve rod 12, is arranged in the through hole 21, and rotates with the rotation of the valve rod 12. The elastic member 14 is arranged so as to be fitted to the outer peripheral end surface 42 (an example of the outer peripheral surface) of the valve body 13 and can come into contact with the inner peripheral surface 26 of the through hole 21.

The operation handle 15 is connected to the valve rod 12 and can rotate around the valve rod 12. By rotating the operation handle 15, the valve body 13 fixed to the valve stem 12 can be rotated to open and close the flow path.

(Valve box)
The valve box 11 may be, for example, a resin such as polyvinyl chloride, polypropylene, polystyrene, ABS resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, and iron, copper, and copper. It may be a metal such as alloy, brass, aluminum or stainless steel, or may be made of any of porcelain and the like.

As shown in FIG. 2, the valve box 11 is formed with a through hole 21, a plurality of connection holes 22, a first insertion hole 23, and a second insertion hole 24.

The through hole 21 is formed substantially in the center of a substantially circular shape. The through hole 21 forms a flow path through which the fluid flows.

The plurality of connection holes 22 are formed so as to penetrate around the through holes 21 of the valve box 11. A plurality of connection holes 22 are provided for connecting to the pipe member. For example, a bolt or the like is inserted into the connection hole 22 to connect with the flange portion of the pipe member.

The first insertion hole 23 penetrates from the inner peripheral surface 26 of the through hole 21 to the outer peripheral surface 27 of the valve box 11 and is formed in the valve box 11. The first insertion hole 23 is formed in a direction perpendicular to the central axis O of the through hole 21.

The second insertion hole 24 communicates with the bearing portion 25 provided inside the valve box 11 from the inner peripheral surface 26 of the through hole 21. The second insertion hole 24 is provided so as to face the first insertion hole 23 with the central axis O of the through hole 21 interposed therebetween. The second insertion hole 24 is provided on the same straight line as the first insertion hole 23 (the central axis P of the valve stem 12).

FIG. 4A is a cross-sectional view of the butterfly valve 1 in a plane perpendicular to the central axis P and including the central axis O. FIG. 4B is an enlarged view of part A of FIG. 4A.

Peripheral portions 28 and 29 are formed on the peripheral edges of both openings of the through hole 21. The peripheral edges 28 and 29 are substantially annular in front view and are formed in a plane. The peripheral edges 28 and 29 are arranged parallel to the central axis P and perpendicular to the central axis O.

An annular grooves 28a and 29a are formed in each of the peripheral edges 28 and 29 so as to surround the opening of the through hole 21. Water stop rings 16 and 17 (an example of a sealing member) are fitted in the grooves 28a and 29a to prevent leakage from the connected pipes.

The inner peripheral surface 26 of the through hole 21 has a contact surface 26a, a connection surface 26b (an example of a first connection surface), and a connection surface 26c (an example of a second connection surface).

As shown in FIG. 4B, the contact surface 26a comes into contact with the first elastic portion 61, which will be described later, when the through hole 21 is closed.

The connecting surface 26b connects to the edge of the opening formed in the peripheral edge 28 and the contact surface 26a. The connecting surface 26b is inclined toward the central axis O from the peripheral edge portion 28 toward the contact surface 26a.

The connecting surface 26c connects to the edge of the opening formed in the peripheral edge portion 29 and the contact surface 26a. The connecting surface 26c is inclined toward the central axis O from the peripheral edge portion 29 toward the contact surface 26a.

As described above, the contact surface 26a is formed so that the inner peripheral surface protrudes inward (toward the central axis O side).

(Valve bar)
The valve rod 12 is a rod member made of a metal such as stainless steel, and as shown in FIG. 2, a valve body 13 described later is fixed in the middle.

The valve rod 12 penetrates the first insertion hole 23 of the valve box 11, crosses the through hole 21 of the valve box 11, penetrates the second insertion hole 24 of the valve box 11, and the first end 12a is the bearing portion. It is held rotatably at 25.

Further, as shown in FIG. 2, the second end 12b of the valve rod 12 projects outward from the outer peripheral surface 27 of the valve box 11. An operation handle 15 is connected to the second end 12b.

(Valve body)
The valve body 13 is formed of, for example, a resin material such as PP (polypropylene) or PVDF (polyvinylidene fluoride), and has a substantially disk shape. FIG. 5 is a perspective view of the valve body 13.

The valve body 13 of the present embodiment is a valve body of a central valve. The valve body 13 is fixed to the valve rod 12, rotates in the through hole 21 with the rotation of the valve rod 12, and has an elastic member 14 fitted in the outer peripheral end surface 42 thereof in the through hole 21. The through hole 21 is closed by abutting the peripheral surface 26.

The valve body 13 is formed with a valve rod hole 41 through which the valve rod 12 is penetrated and fixed. The valve stem hole 41 is formed perpendicular to the central axis O.

The valve body 13 has a substantially disk shape and has an outer peripheral end surface 42. The outer peripheral end surface 42 faces the contact surface 26a of the through hole 21 when the valve body 13 is closed.

The outer peripheral end surface 42 is provided with valve rod hole peripheral portions 42a and 42b and a valve blade portion 42c.
The valve stem hole peripheral portion 42a is a flat portion provided around the valve stem hole 41 in the outer peripheral end surface 42, and is formed on the second end 12b side of the valve stem 12. The valve stem hole peripheral portion 42b is a flat portion provided around the valve stem hole 41 in the outer peripheral end surface 42, and is formed on the first end 12a side of the valve stem 12. The planes of the valve stem hole peripheral portion 42a and the valve stem hole peripheral portion 42b are formed perpendicular to the valve stem hole 41.

The valve wing portion 42c is a portion of the outer peripheral end surface 42 that connects the valve rod hole peripheral portion 42a and the valve rod hole peripheral portion 42b. The valve wing portion 42c is formed on a curved surface. As shown in FIG. 5, the valve wing portion 42c is provided on both the left and right sides.

In order to attach the elastic member 14 to the valve body 13, a first fitting recess 51 is formed in each of the two valve blade portions 42c, and a second fitting recess 52 is formed in each of the valve rod hole peripheral portions 42a and 42b. Is formed.

(1st fitting recess)
The first fitting recess 51 (an example of the first fitting recess) is formed in each of the two valve blade portions 42c along the outer peripheral direction (see arrow B). The first fitting recess 51 is provided for attaching the elastic member 14 to the valve body 13. In FIG. 5, the first fitting recess 51 is hatched for easy understanding.

FIG. 6A is a cross-sectional view taken along the line between CCs of FIG. 5 and shows the shape of the first fitting recess 51. In the present embodiment, the first fitting recess 51 is formed, for example, in a substantially inverted T shape. Since the two valve blade portions 42c have a symmetrical shape with respect to the central axis O, one valve blade portion 42c (on the right side in the figure) will be described as an example.

The first fitting recess 51 has a main space 511 (an example of a first space) and two subspaces 512 (an example of a second space).

The main space 511 is formed from the opening 511a formed in the valve wing portion 42c toward the inner side in the radial direction of the valve body 13. Assuming that the central axis of the valve body 13 perpendicular to the central axis P is Q, the radial inside is the direction toward the central axis Q (see arrow D1 in the figure). The central axis Q substantially coincides with the central axis O of the through hole 21 when the valve body 13 is closed. The outer side in the radial direction is a direction away from the central axis of the valve body 13 and is the opposite direction to the inner side in the radial direction (see arrow D2).

The sub-space 512 projects outward in the width direction from the inner side wall 511b in the width direction (see arrow E in the figure) of the main space 511. The width direction E is a direction along the central axis Q, and is substantially parallel to the central axis O when the valve body 13 is closed.

(Second fitting recess)
The second fitting recess 52 (an example of the second fitting recess) is formed in each of the valve rod hole peripheral portions 42a and 42b along the outer circumference thereof. The second fitting recess 52 is provided for attaching the elastic member 14 to the valve body 13. In FIG. 5, the second fitting recess 52 is hatched for easy understanding.

FIG. 6B is a cross-sectional view taken along the line between the FFs of FIG. 5 and shows the shape of the second fitting recess 52. In the present embodiment, the second fitting recess 52 is formed, for example, in a substantially inverted T shape. Since the valve rod hole peripheral portions 42a and 42b have a symmetrical shape with respect to the central axis O, the valve rod hole peripheral portion 42a will be described as an example.

The second fitting recess 52 has a main space 521 (an example of a third space) and two subspaces 522 (an example of a fourth space). The main space 521 is formed from the opening 521a formed in the peripheral portion 42a of the valve rod hole toward the inside in the radial direction (arrow D1 direction) of the valve body 13.

The sub-space 522 projects outward in the width direction G from the inner side wall 521b in the width direction of the main space 521. The width direction G of the main space 521 is a direction perpendicular to the central axis P and approaching the central axis P (see G1) or away from the central axis P (see G2).

(Elastic member)
The elastic member 14 is fitted and arranged on the outer peripheral end surface 42 of the valve body 13. The elastic member 14 may be a rubber-like elastic body, and is not particularly limited. For example, ethylene propylene rubber, ethylene propylene diene rubber, isoprene rubber, chloroprene rubber, chlorosulphonized rubber, nitrile rubber, and styrene. Suitable examples include butadiene rubber, chlorinated polyethylene, fluororubber (FPM, FKM), and the like. The altitude of the elastic body is preferably 50 to 80.

FIG. 7 is a perspective view showing the elastic member 14. The elastic member 14 is formed along the outer peripheral end surface 42 of the valve body 13, is fitted into the first fitting recess 51 and the second fitting recess 52 described above, and fits into the outer peripheral end surface 42 of the valve body 13. Be placed. FIG. 8 is a perspective view showing the valve body 13 and the elastic member 14 arranged on the valve body 13.

As shown in FIG. 7, the elastic member 14 has two first elastic portions 61 (an example of a first elastic portion) and two second elastic portions 62 (an example of a second elastic portion).

The two second elastic portions 62 are annular to each other and are arranged so as to face each other. Each of the two second elastic portions 62 fits into the second fitting recess 52.

The two first elastic portions 61 are curved outwardly and are arranged so as to face each other with the central axis P in between. The two first elastic portions 61 connect the two second elastic portions 62.

(1st elastic part)
FIG. 9A is a cross-sectional view taken along the line between HH'of FIG. 7 and is a diagram for explaining the shape of the first elastic portion 61. 9 (b) is a cross-sectional view taken along the line between JJ'in FIG. 8, and the first elastic portion 61 shown in FIG. 9 (a) is attached to the first fitting recess 51 shown in FIG. 6 (a). It is sectional drawing which shows the state.

As shown in FIG. 9A, the first elastic portion 61 is paired with an outer convex portion 611 (an example of a first outer convex portion) and a fitting convex portion 612 (an example of a first fitting convex portion). Has an on-plane convex portion 613 and. As shown in FIG. 9B, the outer convex portion 611 projects outward from the valve wing portion 42c of the outer peripheral end surface 42 when arranged on the valve body 13. The outer convex portion 611 is a portion that comes into contact with the contact surface 26a. The fitting convex portion 612 is fitted into the first fitting concave portion 51 as shown in FIGS. 9 (a) and 9 (b).

The outer convex portion 611 has a tip end portion 614 and a base end portion 615. The tip portion 614 is convexly curved toward the radial outer side (see arrow D2) of the valve body 13. This makes it possible to prevent stress concentration when the tip portion 614 comes into contact with the contact surface 26a. In the present embodiment, the tip surface 614a of the tip portion 614 is formed by one R in a cross-sectional view.

The base end portion 615 is formed from the fitting convex portion 612 toward the outer side in the radial direction (see arrow D2). The base end portion 615 is provided between the tip end portion 614 and the fitting convex portion 612. The base end portion 615 has both side surfaces 615a in the width direction (arrow E direction) formed in a flat shape. The length of the base end portion 615 in the width direction (arrow E direction) is preferably formed in the width direction (arrow E direction) of the tip end portion 614 or more. As a result, the rigidity of the tip portion 614 can be ensured. In the present embodiment, both side surfaces 615a in the width direction of the base end portion 615 are formed in a plane, and the intervals are constant, so that the width of the base end portion 615 is formed to be constant.

As shown in FIG. 9A, the fitting convex portion 612 has a main convex portion 616 and two sub-convex portions 617. The main convex portion 616 is formed from the base end portion 615 toward the inside in the radial direction (direction of arrow D1). When the elastic member 14 is attached to the valve body 13, the main convex portion 616 is arranged in the main space 511 as shown in FIG. 9B.

As shown in FIG. 9A, the two sub-convex portions 617 project from the tip of the main convex portion 616 toward both sides in the width direction (arrow E). When the elastic member 14 is attached to the valve body 13, the two sub-convex portions 617 are arranged in the two sub-spaces 512, respectively, as shown in FIG. 9 (b).

As shown in FIG. 9A, the surface convex portion 613 projects from the outer convex portion 611 toward both sides in the width direction E. The surface convex portion 613 is formed from the side surface 615a of the base end portion 615. As shown in FIG. 9B, the surface convex portion 613 is formed along the valve wing portion 42c when the elastic member 14 is attached to the valve body 13.

(Second elastic part)
FIG. 10A is a cross-sectional view taken along the line II'of FIG. 7 for explaining the shape of the second elastic portion 62. FIG. 10 (b) is a cross-sectional view taken along the line between KKs of FIG. 8, and the second elastic portion 62 shown in FIG. 10 (a) is attached to the second fitting recess 52 shown in FIG. 6 (b). It is sectional drawing which shows the state.

The second elastic portion 62 has an outer convex portion 621 (an example of a second outer convex portion) and a fitting convex portion 622 (an example of a second fitting convex portion). When the outer convex portion 621 is arranged on the valve body 13, the outer convex portion 621 projects outward from the valve rod hole peripheral portion 42a of the outer peripheral end surface 42. The outer convex portion 621 is a portion that abuts on the inner peripheral surface 26. The fitting convex portion 622 fits into the second fitting concave portion 52.

The outer convex portion 621 has a tip end portion 624 and a base end portion 625. The tip portion 624 is convexly curved toward the radial outer side (see arrow D2) of the valve body 13. This makes it possible to prevent stress concentration when the tip portion 624 comes into contact with the inner peripheral surface 26. In the present embodiment, the tip surface 624a of the tip portion 624 is formed by one R in a cross-sectional view.

The base end portion 625 is formed from the fitting convex portion 622 toward the outer side in the radial direction (see arrow D2). The base end portion 625 is provided between the tip end portion 624 and the fitting convex portion 622. The base end portion 625 has both side surfaces 625a in the width direction (diameter direction G) formed in a flat shape. The length of the base end portion 625 in the width direction (diameter direction G) is preferably formed in the width direction (diameter direction G) of the tip end portion 624 or more. As a result, the rigidity of the outer convex portion 621 can be ensured. In the present embodiment, both side surfaces 625a in the width direction of the base end portion 625 are formed in a plane, and the intervals are constant, so that the width of the base end portion 625 is formed to be constant.

As shown in FIG. 10A, the fitting convex portion 622 has a main convex portion 626 and two sub-convex portions 627. The main convex portion 626 is formed from the base end portion 625 toward the inside in the radial direction (direction of arrow D1). When the elastic member 14 is attached to the valve body 13, the main convex portion 626 is arranged in the main space 521 as shown in FIG. 10 (b).

As shown in FIG. 10A, the two sub-convex portions 627 project from the tip of the main convex portion 626 toward both sides in the width direction (arrow G). When the elastic member 14 is attached to the valve body 13, the two sub-convex portions 627 are arranged in the two sub-spaces 522, respectively, as shown in FIG. 10 (b).

In the second elastic portion 62, the outer convex portion 621 is formed larger than the outer convex portion 611 of the first elastic portion 61.

<Operation>
FIG. 11A is a schematic view showing an open / closed state of the flow path. In FIG. 11A, the valve body 13 with the flow path closed is shown by a solid line, and the valve body 13 with the flow path open is shown by a chain double-dashed line. FIG. 11B is an enlarged view of the L portion of FIG. 11A, and shows a state in which the first elastic portion 61 is separated from the contact surface 26a by a chain double-dashed line.

By rotating the operation handle 15 in a predetermined direction, the valve rod 12 rotates in a predetermined direction, and the valve body 13 fixed to the valve rod 12 also rotates in a predetermined direction.

The valve body 13 rotates, and the elastic member 14 fitted and arranged on the outer peripheral end surface 42 of the valve body 13 comes into contact with the inner peripheral surface 26 of the through hole 21 of the valve box 11 to compress the elastic member 14. As a result, the through hole 21 is closed and the flow path is closed.

When the operation handle 15 is rotated in the direction opposite to the predetermined direction from the state where the flow path is closed, the valve rod 12 rotates in the opposite direction, and the valve body 13 fixed to the valve rod 12 also rotates in the opposite direction. .. As a result, the elastic member 14 is separated from the inner peripheral surface 26, the through hole 21 is opened, and the flow path is opened. By rotating the operation handle about 90 degrees from the state where the flow path is completely closed, the flow path is fully opened.

Further, as shown in FIG. 11B, since the contact surface 26a is formed so as to bulge from the inner peripheral surface 26, the valve body starts from the state where the first elastic portion 61 is in contact with the contact surface 26a. By rotating 13 a little, it does not come into contact with the inner peripheral surface 26, and the contact area can be suppressed. Therefore, the frictional resistance at the time of opening and closing becomes small, and the flow path can be opened and closed with low torque. It is preferable to set the contact surface 26a so that it does not come into contact with the contact surface 26a when the opening / closing degree position reaches 10% from the completely closed state. The position of 10% opening / closing degree is a position rotated by 9 degrees from the completely closed state, assuming that the rotation angle from the completely closed state to the completely opened state of the flow path is 90 degrees.

<Other embodiments>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.

(A)
The butterfly valve 1 of the above embodiment is provided with an operation handle 15 and is manually opened and closed, but the valve 1 is not limited to this, and is pneumatically driven by air pressure or electrically driven by a motor or the like. May be.

(B)
In the above embodiment, the tip surface 614a of the tip portion 614 of the first elastic portion 61 is formed by one R in a cross-sectional view, but is not limited to this, and is formed by a plurality of Rs. It may be curved outward in the radial direction (see arrow D2).

Further, in the above embodiment, the tip surface 624a of the tip portion 624 of the second elastic portion 62 is formed by one R in a cross-sectional view, but is not limited to this, and is formed by a plurality of Rs. It may be curved outward in the radial direction (see arrow D2).

(C)
In the above embodiment, the base end portion 615 of the first elastic portion 61 is formed to have a constant width, but the width is not limited to this, and the width may be changed. Further, although the both side surfaces 615a of the base end portion 615 are formed in a plane shape, the both side surfaces 615a of the base end portion 615 may be curved outward.

In the above embodiment, the base end portion 625 of the second elastic portion 62 is formed to have a constant width, but the width is not limited to this, and the width may be changed. Further, although the both side surfaces 625a of the base end portion 625 are formed in a flat shape, the both side surfaces 625a of the base end portion 625 may be curved outward.

(D)
In the above embodiment, the fitting convex portion 612 of the first elastic portion 61 is provided with two sub-convex portions 617, but the number and position are not limited to this. However, it is preferable that at least one protrusion is provided.

In the above embodiment, the fitting convex portion 622 of the second elastic portion 62 is provided with two sub-convex portions 627, but the number and position are not limited to this. However, it is preferable that at least one protrusion is provided.

(E)
In the above embodiment, the first elastic portion 61 is provided with two on-plane convex portions 613, but the present invention is not limited to this, and for example, only one of them may be provided.

(F)
In the above embodiment, the connecting surfaces 26b and 26c are formed linearly in a side cross-sectional view, but the present invention is not limited to this, and the connecting surfaces 26b and 26c may be curved.

According to the butterfly valve of the present invention, it has an effect of improving long-term water stopping performance, and can be used for opening and closing various pipes such as chemical factories, water and sewage systems, agriculture, and fisheries.

1: Butterfly valve 11: Valve box 11b: Other end 12: Valve rod 13: Valve body 14: Elastic member 21: Through hole 41: Valve rod hole 42: Outer peripheral end face

Claims (9)

It ’s a two-way butterfly valve,
A valve box having a through hole forming a flow path and
A valve stem rotatably supported by the valve box,
A valve body provided in the through hole and rotating with the rotation of the valve stem,
An elastic member that is fitted and arranged on the outer peripheral surface of the valve body and is capable of contacting the inner peripheral surface of the through hole.
Butterfly valve. The valve body has a valve rod hole through which the valve rod is inserted, and the valve body has a valve rod hole through which the valve rod is inserted.
The outer peripheral surface of the valve body includes a valve rod hole peripheral portion provided around each of the two openings of the valve rod hole and a valve blade portion provided between the valve rod hole peripheral portions. Have and
The elastic member is
A first elastic portion arranged along the valve wing portion and
It has a second elastic portion arranged in an annular shape around the valve stem hole, and has a second elastic portion.
The valve wing portion has a first fitting recess that fits with the first elastic portion.
The first elastic portion has a first outer convex portion protruding from the outer peripheral surface and a first fitting convex portion that can be fitted into the first fitting concave portion.
The valve rod hole peripheral portion has a second fitting recess that fits with the second elastic portion.
The second elastic portion has a second outer convex portion protruding from the outer peripheral surface and a second fitting convex portion that can be fitted into the second fitting concave portion.
The butterfly valve according to claim 1. The first fitting recess has a first space provided inward in the radial direction of the valve body and a second space protruding from the inner side wall of the first space.
The first fitting convex portion has a first convex portion arranged in the first space and a second convex portion protruding from the first convex portion and arranged in the second space.
The butterfly valve according to claim 2. The first outer convex portion is
A first tip portion that is convexly curved toward the outside in the radial direction of the valve body, and
It has a first base end portion provided between the first tip portion and the first fitting convex portion, and has.
The width of the first base end portion is formed to be equal to or larger than the width of the first tip end portion.
The butterfly valve according to claim 2 or 3. The first elastic portion is
It has an on-plane convex portion that protrudes from the side surface of the first outer convex portion in the width direction so as to be along the outer peripheral surface.
The butterfly valve according to any one of claims 2 to 4. The second fitting recess has a third space provided inward in the radial direction of the valve body and a fourth space protruding from the inner side wall of the third space.
The second fitting convex portion has a third convex portion arranged in the third space and a fourth convex portion protruding from the third convex portion and arranged in the fourth space.
The butterfly valve according to any one of claims 2 to 5. The second outer convex portion is
A second tip that is convexly curved toward the outside in the radial direction of the valve body, and
It has a second base end portion provided between the second tip portion and the second fitting convex portion, and has.
The width of the second base end portion is formed to be equal to or larger than the width of the second tip end portion.
The butterfly valve according to claim 2. The inner peripheral surface of the through hole is
The contact surface with which the elastic member comes into contact when the flow path is closed,
A first connecting surface connecting the edge of one opening of the through hole and the contact surface,
It has a second connecting surface that connects the other opening of the through hole and the contact surface.
The first connecting surface is inclined or curved so as to be inward in the radial direction of the through hole toward the contact surface.
The second connecting surface is inclined or curved so as to be radially inward of the through hole toward the contact surface.
The butterfly valve according to any one of claims 1 to 7. Further provided with a sealing member disposed around the opening of the through hole in the valve box.
The butterfly valve according to any one of claims 1 to 8.

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