JP3078734B2 - Butterfly valve for high temperature fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve which can be suitably used for switching a flow path of a high-temperature fluid, for example, a vehicle exhaust gas. However, the butterfly valve of the present invention can be used for fluids at room temperature and low temperature.

[0002]

2. Description of the Related Art A butterfly valve is used for switching a fluid flow path, and generally includes a duct forming a fluid flow path and a flap rotatably fixed inside the duct. Have. When the flap is positioned substantially parallel to the fluid flow, the fluid can flow through the duct. On the other hand, when the flap is arranged in a direction that intersects the flow of the fluid, the fluid cannot pass through the duct. These two states are controlled by the rotation of the flap.

Conventionally, a metal flap and a metal duct have been used for a butterfly valve. When the butterfly valve is used to switch the flow path of a high-temperature fluid such as a combustion gas, the flap and the duct are exposed to the high-temperature fluid and thermally deformed. There is a problem that the gap between the inner wall and the inner peripheral surface of the duct increases and the leakage of the combustion gas increases. Further, the bearing portion of the duct may be worn or seized.
While the entire flap is exposed to the high-temperature fluid, the duct is exposed on the inner peripheral surface to the high-temperature fluid, and the outer peripheral surface of the duct is cooled by the outside. Therefore, when the flap thermally expands, the peripheral surface of the flap contacts the inner peripheral surface of the duct,
The rotation of the flap sometimes became difficult. If the clearance between the peripheral surface of the flap and the inner peripheral surface of the duct is set to be large in order to solve such a problem, the gap when the low-temperature fluid flows increases, and the leakage of the fluid increases.

Therefore, Japanese Patent Application No. 6-322254 discloses that
We propose a butterfly valve that uses a ceramic flap,
The above problem has been solved. Since ceramics have high heat resistance, thermal deformation of the flap at high temperatures can be prevented. In addition, since ceramics have high wear resistance, wear of the flap can be avoided. Furthermore, ceramics have a lower coefficient of thermal expansion than ordinary metals and can prevent abrasion, so that a good sealing function when the flap is closed can be maintained.

[0005]

[Problems to be Solved by the Invention] Japanese Patent Application No. Hei 6-3222
In the structure of No. 54, a flap and a pin acting as an axis for rotating the flap are manufactured separately, and the pin is fixed to the flap. However, sufficient durability cannot always be ensured at the joint between the flap and the pin. Further, not only when the flap is normally opened and closed but also when the flap is opened, the sliding surface between the flap and the pin and the sliding surface between the pin and the lever are worn. Further, the frictional resistance at the sliding surface between the ceramic pin and the duct is reduced as compared with the metal pin, but there is still a resistance due to the contact friction between the solids.

[0006]

Means for Solving the Problems In the present invention, the ceramic flap and the ceramic shaft are integrally formed by injection molding, casting, or the like. That is, according to the present invention, a butterfly valve having a duct, a flap member, and a pair of sleeves, wherein the duct is
A wall portion which forms an inner space, have a pair of bearing portions contiguous to the wall, each of the bearing unit forms a bearing hole which communicates with the interior space, of the duct those
Contact the wall or the bearing from the side of the duct.
A groove communicating with each of the bearing holes is formed,
When the shaft of the flap member passes through the groove,
So that it can be inserted into the bearing of the duct
The flap member has a flap portion and a pair of shaft portions extending in the rotation axis direction of the flap portion, and the flap portion is formed in the internal space of the duct. The pair of shaft portions of the flap member are inserted and fixed in the pair of bearing holes of the duct, respectively, so that the flap member can be rotated by the silicon nitride, silicon carbide, or sialon. have been substantially configuration, with the flap portion and the pair of the shaft portion be integrally formed, a pair of the sleeve, each one of the bearing section and the flap member of the duct
A butterfly valve is provided, which is disposed between a pair of the shaft portions.

[0007] In the present invention, the person said flap member,
It has a pair of connecting portions that connect the flap portion and the pair of shaft portions, each of which has a shape of a rotating body that shares a rotation axis of the flap member, The connecting portion preferably has a portion that tapers along the rotation axis toward the center of the flap portion. Further, it is preferable that each of the connecting portions has a conical portion sharing the rotation axis of the flap member and a flange portion continuous with the conical portion. Furthermore, each of the sleeves is formed with a hole into which the shaft of the flap member is inserted, and the sleeve is inserted into the bearing of the duct together with the shaft of the flap member. Is preferred. Further, one of the sleeves has a cylindrical shape that forms a through hole penetrating from one end to the other end, and the other of the sleeve has one of the shaft portions of the flap member. Preferably, a recess for insertion is formed. Furthermore, in the pair of shaft portions of the flap member, one is preferably longer in the axial direction than the other, and the longer shaft portion is preferably inserted into a through hole of the sleeve having a through hole. Further, the duct and the pair of sleeves may be substantially composed of silicon nitride, silicon carbide, or sialon. Further, the duct and the pair of sleeves may be substantially formed of metal. Further, it is preferable that the pair of bearing portions and the pair of sleeves of the duct are fixed by welding. Furthermore, it is preferable that the welding be performed so that the peripheral surface of the flap and the inner peripheral surface of the wall of the duct come into close contact with the flap closed. Further, it is preferable that a step is formed on an inner peripheral surface of the pair of bearing portions of the duct, and a step is formed in a corresponding shape on an outer peripheral surface of the pair of sleeves. Further, it is preferable to have a drive unit for rotating the flap member.

In the butterfly valve of the present invention, a flap member in which a flap portion and a shaft portion are integrally formed is used.
Such a flap member is, for example, a molded body having the shape of the flap member is formed by injection molding, casting, or the like,
Then, it can be obtained by sintering. Since the flap portion and the shaft portion are not manufactured separately, the durability at the joint portion between the flap portion and the shaft portion can be improved. In addition, by providing a joining portion having a conical portion or the like between the flap portion and the shaft portion, the durability can be further improved. When manufacturing the butterfly valve, a groove communicating with the bearing from the side of the duct is preferably formed so that the shaft of the flap member can be easily inserted into the bearing of the duct from the side of the duct.

In one embodiment of the present invention, the duct and the sleeve are made of ceramic, and silicon nitride, silicon carbide, or sialon can be suitably used. In another embodiment of the present invention, the duct and the sleeve are made of metal, and low thermal expansion cast iron, stainless steel, or the like can be suitably used. When the duct and the sleeve are made of ceramics, two sliding surfaces can be provided for opening and closing the flap member, so that wear on the sliding surfaces can be reduced. The two sliding surfaces are the outer peripheral surface of the shaft of the flap member and the inner peripheral surface of the sleeve, and the outer peripheral surface of the sleeve and the inner peripheral surface of the bearing of the duct.

[0010]

1 and 2 are explanatory views of a butterfly valve according to the present invention, showing an embodiment in which a duct and a sleeve are made of ceramic. In FIGS. 1 and 2,
The state where the flap member 20 has closed the duct 10 is shown. The shaft portions 24a, 24b of the flap member 20 are connected to the bearing portions 14a, 14 of the duct 10 together with the sleeves 30, 40.
b is rotatably inserted and fixed. Duct 1
The flap member 20 and the pair of sleeves 30 and 40 are housed in housings 52 and 54. The flap portion 22 of the flap member 20 can rotate in the internal space 11 of the duct 10, thereby closing or opening the duct 10. In FIG. 1A, the imaginary line of the flap member 20 indicates a state where the flap member 20 has opened the duct 10.

FIGS. 3 and 4 are explanatory views of the duct 10 and the flap member 20 used in FIGS. 1 and 2, respectively. In FIG. 3, the duct 10 has a wall 12 forming an internal space 11 and bearings 14a and 14b forming bearing holes 13a and 13b. Bearing portions 14a, 14
b is continuous with the wall portion 12, and the bearing holes 13a and 13b communicate with the internal space 11. A pair of bearing holes 13a, 13b
Share a common axis, and this axial direction intersects at right angles to the axial longitudinal direction of the wall 12. The inner peripheral surface of the wall portion 12 is
It is preferable that the flap portion 22 having a substantially disc shape has a substantially cylindrical shape in order to rotate in the internal space 11.
The inner peripheral surfaces 13a, 13b of the bearing portions 14a, 14b have a substantially cylindrical shape corresponding to the outer peripheral surfaces 30s, 40s of the sleeves 30, 40, respectively. In the embodiment shown in FIGS. 1 and 2, the rotation of the flap member 20 causes the bearing portion 1 to rotate.
Inner surfaces 13a, 13b of sleeves 4a, 14b and sleeve 3
The outer peripheral surfaces 30 s and 40 s of 0 and 40 slide. Furthermore,
It is preferable to be able to slide on the inner peripheral surfaces 33, 43 of the sleeves 30, 40 and the outer peripheral surfaces of the shaft portions 24a, 24b of the flap member 20. This is because having two pairs of sliding surfaces further reduces the friction when the flap member 20 rotates.

The duct 10 has a pair of side surfaces 10 s and 10 t substantially parallel to each other, and the wall portion 12 or the bearing portions 14 a and 14 b are provided with one side surface 10 s of the duct 10.
16a, 16 communicating with bearing holes 13a, 13b from
b is formed. The grooves 16a and 16b are formed parallel to the axial longitudinal direction of the wall portion 12. Flap member 20
Shaft portions 24a, 24b are respectively provided with grooves 16a, 16b.
Through the bearings 14a, 1
4b. That is, FIG.
In (d), the width 16c of the grooves 16a, 16b is preferably equal to or larger than the outer diameter of the shaft portions 24a, 24b of the flap member 20. In FIG. 3, the width 16c of the grooves 16a, 16b is formed to the diameter of the bearing holes 13a, 13b.

In FIG. 4, the flap member 20 connects the flap portion 22 having a substantially disk shape, a pair of shaft portions 24 a and 24 b having a substantially cylindrical shape, and the flap portion 22 and the pair of shaft portions 24 a and 24 b. A pair of connecting portions 27a,
28a, 27b and 28b. Flap member 20
Of the flap portion 22 passes through the center of the flap portion 22, and the shaft portion 24
The axis is common to the axes a and 24b. The flap portion 22 has a pair of side surfaces 22s and 22t that are parallel to each other. The peripheral surface 22u of the flap portion 22 has a cylindrical surface inclined by 20 degrees in the rotation direction with respect to the direction perpendicular to the side surfaces 22s and 22t. For example, as shown in FIG. 1, when the flap 22 closes the internal space 11 of the duct 10, the flap 22
2 intersects at about 20 degrees with the longitudinal direction of the shaft. This angle is preferably 10 to 30 degrees. Shaft 24a
Has a notch 26 for fixing the lever 62. As the lever 62 moves, the flap 22
Rotates.

In FIG. 4, it is preferable that the connecting portion has a shape of a rotating body that shares the rotation axis of the flap member 20, and the connection portion is directed along the rotation axis toward the center of the flap portion. , That is, it has conical portions 27a and 27b and flanges 28a and 28b that are continuous with the bottom surfaces of the conical portions 27a and 27b. It is preferable that the flanges 28a, 28b and the shaft portions 24a, 24b are connected near the peripheral surface 22u of the flap portion 22. Since the shaft portions 24a, 24b and the flap portion 22 are connected by the connection portions 27a, 27b, 28a, 28b, the concentration of stress generated in the connection portion by the rotation torque of the flap member 20 can be reduced.

[0015] End surfaces 29 of the flange portions 28a and 28b
a, 29b are end faces 3 of the sleeves 30, 40, respectively.
Preferably, the airtight contact is made between the end surfaces 29a and 29b of the flange portions 28a and 28b and the end surfaces 31 and 41 of the sleeves 30 and 40 when the flap portion 22 is closed. Leakage from the gap can be prevented. The peripheral surfaces 29c, 29d of the flange portions 28a, 28b are preferably flush with the outer peripheral surfaces 30s, 40s of the sleeves 30, 40, respectively. However, the peripheral surfaces 29c, 29d of the flange portions 28a, 28b
Are the outer peripheral surfaces 30s, 4s of the sleeves 30, 40, respectively.
It may be larger or smaller than 0 s in the radial direction of the rotation shaft.

The pair of sleeves 30 and 40 have a rotating body shape that shares a rotation axis of the flap member 20,
It is preferable that the pair of shaft portions 24a and 24b of the flap member 20 rotate as the pair of shaft portions rotate. Sleeve 30
Has a cylindrical shape, and is formed with a through hole 33 penetrating from one end face 31 to the other end face 32. The shaft portion 24a of the flap member 20 is
And the notch 26 of the shaft portion 24a is
0 protrudes from the end face 32.

The sleeve 40 has a pair of end surfaces 41 and 42.
The end face 41 is formed with a concave portion 43 into which the shaft portion 24b of the flap member 20 is fitted. A gap may be formed between the end surface 24c of the shaft portion 24b and the concave portion 43. End surface 42 of sleeve 40
Are tapered to form a vertex 44. The end surface 42 is a curved surface that is rounded around a vertex 44, and the sleeve 40 and the flap member 20 are
4 makes it easy to rotate.

In FIG. 1, it is preferable that a stopper 51 for restraining the rotation of the flap portion 22 when the flap portion 22 opens the duct 10 is provided. When the butterfly valve vibrates, the vibration of the flap portion 22 is prevented, and the wear of the notch 26 of the shaft portion 24a of the flap member 20 and the lever 62 can be prevented. 1 and 2
The duct 10, the flap member 20, the sleeve 30, and the sleeve 40 are housed in an internal space formed by the housings 52, 54. However, the end of the shaft portion 24a of the flap member 20 projects outside the housings 52 and 54. Each of the housings 52 and 54 has walls 53 and 55 forming a fluid flow path, and the flow path is formed in the duct 10.
Communicates with the internal space 11. The housings 52, 54
Each has a wall forming a fluid flow path, and the fluid flow path communicates with the internal space 11 of the duct 10. The housing 52 has a bottom portion 52a that supports the end surface of the sleeve 40, the bearing portion 14b of the duct 10, and the like.

An airtight member 72 such as an o-ring is sandwiched and fixed between the housing 52 and the side surface 10 t of the duct 10, and an airtight member 74 such as an o-ring is sandwiched between the housing 54 and the side surface 10 s of the duct 10. Secured, which prevents fluid leakage. The airtight member 72 is arranged outside the internal space 11 on the side surface 10t of the duct 10, and is preferably slightly larger than the diameter of the internal space 11 on the side surface 10t. The airtight member 74 is a duct 1
It is preferable to be arranged outside the grooves 16a, 16b on the side surface 10s of the zero, and outside the grooves 16a, 16b on the side surface 10s.

The lever 62 has a concave portion 62 a for fitting the cutout portion 26 of the shaft portion 24 a of the flap member 20.
Are formed. The lever 62 has a recess 62b for fixing the seat 58 flush with the outer surface of the lever. The concave portion 62 b is provided with the concave portion 62
Is formed on the opposite side. The lever 62 has a handle 63
And the handle 63 is connected to the connecting rod 85 of the actuator 84. The handle 63 has a joint pin 7
There is formed a through hole through which 8 passes. The joint pin 78 passes through the through hole of the handle 63 and the joint 76 to fix the handle 63 and the connecting rod 85.

The airtight member 60 having a thin annular shape is
The end surface 62 c of the lever 62 around the concave portion 62 a is sandwiched and fixed between the end surface 32 of the sleeve 30. The airtight member 60 can further prevent the fluid passing through the duct from leaking from between the inner peripheral surface 33 of the sleeve 30 and the outer peripheral surface of the shaft portion 24a. Further, the airtight member 60 is provided between the outer peripheral surface 30s of the sleeve 30 and the duct 10
It is preferable to cover the sliding surface between the bearing portion 14a and the inner peripheral surface 13a, that is, the sliding surface can be further prevented. The lever holding member 64 may be a fastener such as a bolt or a screw,
The vertex 64 a of the lever holding member 64 passes through the nut 66 and the cap 56 and abuts on the seat 58 fixed to the lever 62, and the flap member 2 rotates the lever 62.
0 is fixed to the notch 26 of the shaft 24a. The lever holding member 64 shares the rotation axis of the flap member 20.

The connecting rod 85 of the actuator 84 can perform a translational movement, and the lever 62 converts the translational movement into a rotational movement. A bracket 82 fixes the actuator 84 and the housing 52. The cap 56 covers the lever 62 so that the handle 63 of the lever 62 can move. The flange portion 57 of the cap 56 and the housing 52
Is fixed with a fastener such as a bolt.

A method for using the butterfly valve according to the present invention will be described below. When the actuator 84 is driven, the connecting rod 85 makes a translational movement, and accordingly, the handle 63 of the lever 64 makes a translational movement. The lever 62 converts the translational movement into a rotational movement, and rotates the flap member 20 through the notch 26 of the shaft portion 24a of the flap member 20. As the flap 20 rotates, the sleeve 30 and the sleeve 40 may or may not rotate. When the flap 22 is opened, the flap 22 is
Rotation stops when it comes into contact with 1. When the flap portion 22 is closed, the peripheral surface 22u of the flap portion 22 contacts the inner peripheral surface of the wall portion 12 of the duct 10, and the rotation stops. The direction perpendicular to the surfaces 22 s and 22 t of the flap portion 22 forms about 20 degrees with the axial longitudinal direction of the wall portion 12 of the duct 10.

As a method of manufacturing the butterfly valve of the present invention, the pair of shaft portions 24 a and 24 b of the flap member 20 are sequentially passed through the grooves 16 a and 16 b of the duct 10,
Into the bearing portions 14a, 14b. Flap member 2
If the lengths of the pair of shaft portions 0 are different, the long shaft portions 24
a is inserted into the bearing portion 14a through the groove 16a, and then the short shaft portion 24b is inserted into the bearing portion 14b through the groove 16b. Thereafter, the sleeves 30 and 40 are inserted into the bearing holes 13a and 13b respectively from both end surfaces of the duct 10, and at the same time, the shaft portions 24a and 24
b is fitted into the sleeves 30, 40, respectively. And
The duct 10, the flap member 20, and the sleeves 30, 40 are housed in the housings 52, 54, and the lever 62 is attached to connect to the actuator 84.

In the present invention, the flap portion 22 of the flap member 20 and the pair of shaft portions 24a, 24b are formed integrally, and preferably, the flap portion 22, the pair of shaft portions 24a, 24b, and the pair of bearings Parts 27a, 27b, 28
a and 28b are integrally formed. That is, preferably, the entire flap member 20 is formed integrally.
The term “integrally formed” includes a case obtained by sintering a ceramic molded body having a desired shape. For example, a ceramic molded body having a flap portion, a pair of shaft portions, and a pair of connecting portions is molded from a raw material containing ceramic powder, and the molded body is white-processed and sintered. As the ceramic powder, for example, silicon nitride and silicon carbide are used.

In the molding step, molding is performed by injection molding, cast molding or press molding and machining. In injection molding, a molding material containing a ceramic powder and a resin, an organic binder such as wax is molded by a molding machine such as an in-line screw type, and then degreased under pressure or under atmospheric pressure to remove the organic binder. , To obtain a molded body. In the cast molding, a slurry containing a ceramic powder, a small amount of an organic binder, a deflocculant and a solvent is solid-cast, molded by pressure casting or the like, and then dried and the organic binder is removed to obtain a molded article.

In the press forming and machining, a granular powder containing a ceramic powder and a small amount of an organic binder is press-formed at a low pressure, and the organic binder is removed by heating. Get the body. In machining using a machining center, either a wet type or a dry type may be used. In the case of a wet type, it is preferable to perform calcination in order to impart strength to a molded body. In the case of a dry process, the organic binder may be removed after machining using a machining center. In sintering, the atmosphere and temperature may be selected according to the ceramic powder. Normally, silicon nitride may be maintained at about 1700 ° C. in a nitrogen atmosphere, and silicon carbide may be maintained at about 2700 in an argon atmosphere.
The temperature may be maintained at 000 ° C. In some cases, finishing is performed after sintering.

In FIGS. 1 and 2, the duct 10 and the sleeves 30 and 40 are made of ceramics. In contrast, in FIG. 5, the duct 110 and the sleeves 130 and 140 are made of metal. In FIG. 5, actuators and the like are omitted,
1 and 2 may have the same or similar structure. In the embodiment of FIG.
4a, 114b and sleeves 130, 140 are fixed by welding or the like. Shaft 124 of flap member 120
The outer peripheral surfaces 125a and 125b of the a and 124b and the inner peripheral surfaces 133 and 143 of the sleeves 130 and 140 slide.

FIGS. 6 and 7 are illustrations of a duct 110 that can be used in the embodiment of FIG. Wall 11
2 has a pair of end parts which are continuous with the bearing parts 114a and 114b. Bearings 114a, 1 of duct 110
The shape of the horizontal cross section of the outer peripheral surface and the inner peripheral surface of 14b is a circle. The inner peripheral surfaces of the bearing portions 114a and 114b
c, 114d and the inner space 11 of the wall 112
The outer diameter of the bearing portion 113 in the axial direction of the wall portion 112 is larger than the diameter of the bearing holes 113c and 113d on the first side.
The diameters of a and 113b are large. Bearing hole 11
3a, 113b, 113c, and 113d share an axis, and this axis intersects at right angles to the longitudinal direction of the wall 112.

The duct 110 has a pair of substantially parallel side surfaces 110 s and 110 t, and the wall portion 112 has a bearing hole 1 from one side surface 110 s of the duct 110.
Grooves 116a and 116b communicating with 13c and 113d are formed. The grooves 116a and 116b are formed in parallel with the axial direction of the wall 112. Flap member 12
0 shaft portions 124a and 124b
The duct 10 can be inserted into the bearing portions 14a and 14b by sequentially passing through the ducts 10a and 16b.

The flap member 120 has substantially the same shape as the flap member 20 of FIG. However, unlike the flap member 20, the notch is not formed at the end 126 of the shaft portion 124a of the flap member 120.
The flap member 120 slides on the outer peripheral surfaces of the shaft portions 122a and 122b, the inner peripheral surface of the sleeve 130, and the inner peripheral surface of the concave portion of the sleeve 140.

The pair of sleeves 130 and 140 have a rotating body shape that shares a rotation axis of the flap member 120. The sleeve 130 has a cylindrical shape, and has a through hole 13 penetrating from one end face 131 to the other end face 132.
3 are formed. Shaft 124 of flap member 120
a is rotatably inserted into the through hole 133 of the sleeve 130, and the end 126 of the shaft 124 a protrudes from the end surface 132 of the sleeve 130. A gap may be formed between the end surface 124c of the shaft portion 124a and the concave portion 152 of the lever 150. The sleeve 140 has a pair of end surfaces 141, 14
2, and a concave portion 143 for rotatably inserting the shaft portion 124b of the flap member 120 is formed in the end surface 141. The end surface 145 of the concave portion of the sleeve 140,
Are preferably flat to make point contact. A groove 145 is formed annularly on the end face of the concave portion of the sleeve 140.

The sleeves 130 and 140 are respectively
The outer peripheral surfaces of the sleeves 130 and 140 are inserted into the bearing portions 114a and 114b of the duct 110, and the shapes of the inner peripheral surfaces of the bearing portions 114a and 114b correspond to the shapes of the bearing holes 113a, 113b, 113c and 113d. In addition, there are also steps 134c and 144c. Bearing 114
a, 114b are sleeve 1
It is preferable to be fixed to the outer peripheral surfaces of 134 and 134a by welding or the like.

The lever 162 has a recess 163 for fitting the end 126 of the shaft 124 a of the flap 120. The lever 162 has a handle (not shown) and converts a translational movement of the handle into a pivotal movement. An airtight member 160 having a thin annular shape is provided with an end surface 162s of the lever 162 and an end surface 132 of the sleeve 130.
And is fixed between them. Lever holding member 16
Reference numeral 4 may be a fastener such as a bolt or a screw, and penetrates the nut 166 and the cap 156 so that the apex 164a of the lever holding member 164 abuts on the surface of the lever 162 so that the lever 162 can rotate. It is fixed to the end 126 of the shaft 124a of the flap member 120. Lever holding member 1
64 shares the rotation axis of the flap member 20. The cap 156 covers the lever 162 and contacts the end of the bearing 114a of the duct 110 at the end 157 of the cap 156.

The method of manufacturing a butterfly valve having a metal duct and a sleeve is basically the same as the method of manufacturing a butterfly valve having a ceramic duct and a sleeve. However, when welding the duct 110 and the sleeve 130, the peripheral surface 122u of the flap portion 122 and the duct 110
When the inner peripheral surface 112s of the wall portion 112 is as close as possible to the inner peripheral surface 112s, the bearing portions 114a of the duct 110,
Inner peripheral surfaces 115a, 115b of 114b and sleeve 13
It is preferable to fix the outer peripheral surface of each of the first and second 0 and 140 by welding. Peripheral surface 122u of flap member 122 and duct 110
Of the wall 112 with the inner peripheral surface 112s can be reduced.

When the duct and the sleeve are made of metal, it is not always necessary to form a groove communicating from the side surface of the duct to the bearing hole. The duct is formed of a part having a shape divided into two or more, that is, a divided body, and the flap member is stored in the divided body, and the divided bodies can be integrated by welding or the like. The structure of the drive unit that rotates the flap member is not particularly limited, and the connection between the drive unit and the flap member is not limited. For example, in FIGS. 1 and 2, the notch 26 of the shaft portion 24 a of the flap member 20 protrudes from the end face 32 of the sleeve 30, but the notch 26 is located in the through hole 33 of the sleeve 30, 62 concave portion 62a
May extend to the through hole 33 of the sleeve 30.

[0037]

According to the butterfly valve of the present invention, since the flap portion and the pair of shaft portions are formed integrally, the durability at the joint portion between the flap portion and the shaft portion can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a butterfly valve of the present invention.
(A) It is the front view which notched a part. (B) It is sectional drawing cut | disconnected along the AA 'line.

FIG. 2 is a sectional view of the left side surface of the butterfly valve of the present invention.

FIG. 3 is an explanatory diagram of a duct used for the butterfly valve of the present invention. (A) It is sectional drawing cut | disconnected along the BB 'line. (B) It is a front view. (C) It is sectional drawing cut | disconnected along CC 'line. (D) It is sectional drawing cut | disconnected along DD 'line.

FIG. 4 is an explanatory view of a flap member used for the butterfly valve of the present invention. (A) It is explanatory drawing seen from E direction. (B) It is a top view. (C) It is a side view. (D)
It is a front view.

FIG. 5 is an explanatory sectional view of a butterfly valve of the present invention.

FIG. 6 is an explanatory diagram of a duct used for the butterfly valve of the present invention. (A) It is a top view. (B) It is sectional side view cut | disconnected along FF 'line. (C) It is a front view.

FIG. 7 is an explanatory diagram of a duct used for the butterfly valve of the present invention. (A) It is a side sectional view cut along the GG 'line. (B) It is sectional drawing cut | disconnected along the HH 'line. (C) It is sectional drawing cut | disconnected along the II 'line.

[Explanation of symbols]

10 ... duct, 10s, 10t ... side of duct, 11
... internal space, 12 ... wall, 13a, 13b ... bearing hole, 14a, 14b ... bearing, 16a, 16b ...
Groove, 16c: Groove width, 20: Flap member, 22:
Flap part, 24a, 24b ... Shaft part, 26 ... Notch part, 27a, 27b ... Conical part, 28a, 28b ...
Flange part, 29a, 29b ... end face of flange part, 2
9c, 29d: peripheral surface of flange portion, 30: sleeve,
31, 32 ... end face, 40 ... sleeve, 41, 42 ...
End face, 43 recess, 44 top, 51 stopper, 52, 54 housing, 56 cap, 58
... Sheet, 60 ... Airtight member, 62 ... Lever, 64 ...
Lever retainer, 66 ... nut, 72, 74 ... airtight member, 76 ... joint, 78 ... joint pin, 80
... joint ring, 82 ... bracket, 84 ... actuator, 85 ... connecting rod, 86 ... adjuster, 110
... duct, 111 ... internal space, 112 ... wall, 11
3a, 113b ... bearing hole, 114a, 114b ... bearing part, 116a, 116b ... groove, 120 ... flap member, 122 ... flap part, 124a, 124b ... shaft part, 126 ... Ends, 127a, 27b ... Conical portions,
128a, 128b ... flange portion, 130 ... sleeve, 131, 132 ... end face, 140 ... sleeve, 14
1, 142 ... end face, 143 ... concave part, 145 ... vertex,
156: cap, 158: sheet, 160: airtight member, 162: lever

Continuation of the front page (56) References JP-A-7-269332 (JP, A) JP-A-63-158367 (JP, A) JP-A-6-281019 (JP, A) JP-A-3-92536 (JP) , U) Japanese Utility Model Showa 55-106344 (JP, U) Japanese Utility Model Showa 64-38364 (JP, U) Japanese Patent Publication 5-61504 (JP, B2) Japanese Patent Publication 4-72112 (JP, B2) Japanese Utility Model 3-48455 (JP, Y2) Jiko 5-47902 (JP, Y2) Jiko 60-17573 (JP, Y2) Jiko 62-10534 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 1/16-1/226 F16K 27/02 F16K 41/00-41/08 F16K 51/00

Claims (12)

(57) [Claims] 1. A butterfly valve having a duct, a flap member, and a pair of sleeves, the duct having a wall forming an internal space, and a pair of bearings connected to the wall. And each of the bearing portions forms a bearing hole communicating with the internal space,
The wall or bearing of the duct is
A groove communicating with each of the bearing holes is formed from the side of the bearing.
And the shaft of the flap member passes through the groove.
By inserting it into the bearing of the duct
So that the groove is formed, the flap member has a flap portion, and a pair of shaft portions extending in the rotation axis direction of the flap portion, and the flap portion of the duct is The pair of shaft portions of the flap member are respectively inserted and fixed in the pair of bearing holes of the duct so that the flap member can rotate in the internal space, and the flap member is formed of silicon nitride, silicon carbide, or the like. Alternatively, the flap portion and the pair of shaft portions are formed integrally with each other, and the pair of sleeves are respectively formed of the bearing portion of the duct and the pair of the flap members. Characterized in that the butterfly valve is disposed between the shaft portion and the shaft portion. 2. The flap member has a pair of connecting portions connecting the flap portion and the pair of shaft portions, each of the connecting portions sharing a rotation axis of the flap member. have a body shape, claim 1 the connection portion is characterized by having a portion which is tapered toward the center of the flap portion along the rotation axis
Butterfly valve according to. 3. The butterfly valve according to claim 2 , wherein each of the connecting portions has a conical portion sharing a rotation axis of the flap member and a flange portion continuous with the conical portion. . 4. Each of the sleeves is formed with a hole into which the shaft of the flap member is inserted, and the sleeve is inserted into the bearing of the duct together with the shaft of the flap member. The butterfly valve according to any one of the preceding claims, wherein: 5. One of the sleeves has a cylindrical shape that forms a through-hole penetrating from one end to the other end, and the other of the sleeve has a shaft portion of the flap member. The butterfly valve according to any one of the preceding claims, wherein a concave portion for inserting one of the two is formed. 6. A pair of shaft portions of the flap member, one of which is longer in the axial direction than the other, and the longer shaft portion is inserted into a through hole of the sleeve having a through hole. The butterfly valve according to claim 5 , wherein 7. The duct and the pair of sleeves,
The butterfly valve according to claim 1, wherein the butterfly valve is substantially composed of silicon nitride, silicon carbide, or sialon. 8. The duct and the pair of sleeves,
The butterfly valve according to any one of claims 1 to 6 , wherein the butterfly valve is substantially formed of metal. 9. The butterfly valve according to claim 8 , wherein the pair of bearing portions and the pair of sleeves of the duct are fixed by welding, respectively. In a state in which 10. closes the flap portion, claim circumferential surface and the inner peripheral surface of the wall portion of the duct of the flap and is so as to close, characterized by the welding 9 The butterfly valve according to 1. 11. A step is formed on an inner peripheral surface of the pair of bearing portions of the duct, and a step is formed in a corresponding shape on an outer peripheral surface of the pair of sleeves. The butterfly valve according to claim 9 . 12. The butterfly valve according to claim 1, further comprising a driving unit for rotating the flap member.