JP5517659B2 - Butterfly valve - Google Patents

Description

  The present invention relates to a butterfly valve in which a valve body is disposed in a valve box so as to be rotatable around an axis of a valve stem.

  Conventionally, as this type of butterfly valve, there is one described in Patent Document 1. This is the one in which the valve stem is inserted into the through hole of the valve casing seat arranged inside the valve casing, and the valve body seat that is in sliding contact with the valve casing seat is provided on the outer periphery of the valve body that rotates around the axis of the valve stem. The valve body side shaft seal seal material is disposed in the recess of the valve body formed around the valve stem, and the valve box side shaft seal seal material that is in sliding contact with the valve body side shaft seal seal material is disposed in the through hole of the valve box sheet. doing.

  The valve box side shaft seal seal material has a larger diameter than the valve body side shaft seal seal material, and the expansion seal portion wider than the seal surface of the valve body side shaft seal seal material is provided on the seal surface of the valve box side shaft seal seal material. The valve body sheet is formed with a flat surface slidably contacting the expansion seal portion, and the flat surface of the valve body sheet and the seal surface of the valve body side shaft seal material are formed on the same plane level.

  The seal surface of the valve box side shaft seal seal material is provided with a coating portion of tetrafluoroethylene resin to reduce friction with the seal surface of the valve body side shaft seal seal material at a site inside the expansion seal portion. ing.

JP 2003-56721 A

  In the conventional configuration described above, the friction between the seal surface of the valve box side shaft seal seal material and the seal surface of the valve element side shaft seal seal material is reduced by the coating portion of the tetrafluoroethylene resin. Since the seal surface of the shaft seal material and the seal surface of the valve body side shaft seal material are in sliding contact with each other, the torque required for rotation of the valve material cannot be sufficiently reduced.

  An object of this invention is to provide the butterfly valve which can reduce the friction surface which causes the friction in a shaft seal part, and can reduce the torque required for rotation of a valve body.

In order to achieve the above object, the butterfly valve of the present invention inserts the valve stem into the valve box boss portion of the valve box and the through hole of the hub seat portion of the seat member arranged in the valve box, In the butterfly valve that connects and fixes the valve body boss portion of the valve body disposed in the hub seat portion, a part of the hub seat portion including the outer peripheral edge portion of the hub end surface around the valve rod is annularly contacted with the valve body boss portion end surface in a watertight manner. A hub seal surface is formed , and the hub seal surface has a shape whose inner diameter is larger than the inner diameter of the through hole of the hub seat portion, and the hub seat portion is partially slid with the end surface of the valve boss portion including the inner peripheral edge of the hub end surface around the valve stem. A plurality of concentric annular ridges in contact with each other. The smallest ridge has an inner diameter equal to the inner diameter of the through hole of the hub seat, and the ridge is in sliding contact with the outer peripheral surface of the valve stem on the inner peripheral surface. , And the protrusion is a valve boss in a cross section along the axis of the valve stem. The ridge that tapers toward the end face and has a diameter larger than the ridge with the smallest diameter is a flat surface whose surface facing the end face of the valve body boss is perpendicular to the axis of the through hole in the hub seat. It is a special feature.

  As described above, according to the present invention, the hub seat portion of the seat member is configured such that a part of the hub end surface facing the end face of the valve body boss portion forms a hub seal surface, thereby sealing the periphery of the valve stem with the hub seal surface. It is possible to reduce the friction surface between the hub seal surface and the end face of the valve body boss that causes friction in the sealing portion, and to reduce the torque required for the rotation of the valve body.

The expanded sectional view of the hub seat part of the seat member provided in the butterfly valve in an embodiment of the invention Cross section viewed from the front of the butterfly valve The expanded sectional view of the peripheral seat part of the seat member provided in the butterfly valve Partially cutaway front view of seat member provided in the butterfly valve XX arrow view in FIG. Enlarged sectional view of the hub seat portion of the seat member provided in the butterfly valve The expanded sectional view of the hub seat part of the seat member provided in the butterfly valve in other embodiments of the present invention The expanded sectional view of the hub seat part of the seat member provided in the butterfly valve in other embodiments of the present invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, reference examples that contribute to the description of the present invention will be described. As shown in FIGS. 1-3, the butterfly valve 1 arrange | positions the valve body 3 inside the valve box 2, and connects and fixes the valve body 3 to a pair of valve rods 4a and 4b.

  The valve box 2 is made of a cylindrical member and has a flow path 6 therein. The valve box boss 201 on one side of the valve box 2 and the valve boss 202 on the other side are connected to the flow path axis 6a. It has valve rod insertion holes 7a and 7b penetrating in the orthogonal direction.

  One side valve stem 4 a is inserted into the valve stem insertion hole 7 a of the one side valve box boss portion 201, and the other side valve stem 4 b is inserted into the valve stem insertion hole 7 b of the other side valve box boss portion 202. The valve body 3 is rotatable around the rotation axis 8 together with the valve stem 4a on one side and the valve stem 4b on the other side.

  As shown in FIG. 2, the valve body 3 has a disc shape, and the valve body boss portion 301 on one side for inserting the valve stem 4a on one side and the valve body boss portion on the other side for inserting the valve stem 4b on the other side. 302. The valve body boss part 301 on one side and the valve body boss part 302 on the other side have flat circular valve body boss part end faces 3a and 3b at the ends of the valve body 3 in the direction of the rotational axis 8 respectively. ing. The other side valve stem 4b is connected to a rotation drive device (not shown) for applying a rotational force to the valve stem 4b automatically or manually.

  A seat member 10 made of an elastic material such as rubber is provided on the inner surface of the valve box 2. As shown in FIGS. 4 and 5, the seat member 10 includes a hub seat portion 11 on one side for inserting the valve stem 4a on one side, a hub seat portion 12 on the other side for inserting the valve stem 4b on the other side, It has a pair of arcuate peripheral sheet portions 13, 14 that are formed integrally with the hub sheet portion 11 on the side and the hub sheet portion 12 on the other side and are in pressure contact with the outer peripheral edge of the valve body 3.

  The hub seat portion 11 on one side and the hub seat portion 12 on the other side each have a cylindrical shape, and as shown in FIGS. 1 and 6, the hub seat portion 11 on one side is inserted into a hub seat insertion hole 7a. The hub seat portion 12 on the other side is inserted into the hub seat insertion portion 9b formed in the valve stem insertion hole 7b on the other side.

  The one-side hub seat portion 11 has a hub end surface 110 on one side facing the valve body boss portion end surface 3a of the one-side valve body boss portion 301, and the one side hub end surface 110 is around the one side valve stem 4a. A part of the hub end surface 110 including the outer peripheral edge portion forms an annular hub seal surface 19 that is in watertight sliding contact with the valve body boss portion end surface 3a. Similarly, the hub end surface 120 on the other side of the hub seat portion 12 on the other side includes a part including the outer peripheral edge portion of the hub end surface 120 in sliding contact with the valve body boss portion end surface 3b of the valve body boss portion 302 on the other side in a watertight manner. An annular hub seal surface 20 is formed. The hub seal surfaces 19 and 20 can be provided at any position of the hub end surface 110 on one side and the hub end surface 120 on the other side, but here, the hub seal surfaces 19 and 20 are outside the hub end surface 110 on one side and the hub end surface 120 on the other side. The peripheral portion forms hub seal surfaces 19 and 20 over the entire circumference.

  The hub seat portions 11 and 12 have an inner peripheral space portion 27 that forms a through hole into which the valve rods 4a and 4b are inserted. The hub seal surfaces 19 and 20 have an inner diameter that is larger than the inner diameter of the inner peripheral space portion 27 of the hub seat portions 11 and 12. A large shape.

  Further, the one-side hub sheet portion 11 has a convex portion 111 that is in sliding contact with the valve body boss portion end surface 3a or a concave portion 112 that is not in contact with the valve body boss portion end surface 3a on the one side hub end surface 110, and similarly. The hub sheet portion 12 on the other side has a convex portion 121 in sliding contact with the valve body boss portion end surface 3b or a concave portion 122 not in contact with the valve body boss portion end surface 3a on the hub end surface 120 on the other side. The convex portions 111 and 121 and the concave portions 112 and 122 can be formed discontinuously as in a lattice shape or the like, but here are formed annularly around the valve rods 4a and 4b.

  As shown in FIG. 3, a concave fitting groove 15 is formed on the inner peripheral surface of the valve box 2, and the peripheral sheet portions 13 and 14 are paired with a pair of leg portions 16 fitted into the fitting groove 15, respectively. have. Moreover, the recessed groove 17 is formed in the outer peripheral surface of both the peripheral sheet parts 13 and 14 along the longitudinal direction of the peripheral sheet parts 13 and 14, respectively. The concave groove 17 is located between the pair of leg portions 16, and the concave groove 17 is filled with a filler 18 made of a curable resin (for example, epoxy resin).

  Two filler injection holes 23 are formed in the hub sheet portion 11 on one side. One end of each filler injection hole 23 opens to the inner peripheral surface of the hub sheet portion 11 (an example of the surface of the hub sheet portion), and the other end of each filler injection hole 23 is a concave groove in each of the peripheral sheet portions 13 and 14. 17 (opening). Each filler injection hole 23 is formed in a conical shape whose diameter increases from the concave groove 17 side toward the inner peripheral surface side of the hub sheet portion 11. Each filler injection hole 23 is located below the hub seal surface 19 in the direction of the rotation axis 8.

In the configuration described above, the filler injection hole 23 is provided in the hub seat portion 11, but the filler injection hole 23 can also be provided in the valve box 2.
Two air discharge holes 25 are formed in the hub sheet portion 12 on the other side. One end of each air discharge hole 25 opens to the inner peripheral surface (an example of the surface of the hub sheet portion) of the hub sheet portion 12 on the other side, and the other end of each air discharge hole 25 is a recess in each of the peripheral sheet portions 13 and 14. The groove 17 communicates (opens). Each air discharge hole 25 is formed in a conical shape whose diameter increases from the concave groove 17 side toward the inner peripheral surface side of the hub seat portion 12. Each air discharge hole 25 is located above the hub seal surface 20 in the direction of the rotation axis 8.

A closing plug 26 (an example of a closing member) is inserted into each of the filler injection hole 23 and the air discharge hole 25.
Hereinafter, the operation of the above configuration will be described. When assembling the butterfly valve 1, the hub seat portions 11 and 12 of the seat member 10 are inserted into the hub seat insertion portions 9a and 9b, and the leg portions 16 of the peripheral seat portions 13 and 14 are fitted into the fitting grooves 15, 10 is provided on the inner surface of the valve box 2.

  Next, the filler 18 is injected from both filler injection holes 23 into the concave grooves 17 of both peripheral sheet portions 13, 14, and the air 28 in the concave grooves 17 is injected from both the air discharge holes 25 to the other hub sheet portion. It discharges to 12 inner peripheral space parts 27. Thereby, the filler 18 flows into the concave grooves 17 of the peripheral sheet portions 13 and 14 through both the filler injection holes 23, and is filled in the concave grooves 17 while suppressing air entrainment.

  Next, as shown in FIG. 6, a closing plug 26 is inserted into the filler injection hole 23 and the air discharge hole 25 to close the filler injection hole 23 and the air discharge hole 25. The peripheral sheet portions 13 and 14 are securely fixed to the valve box 2 by hardening the filler 18 in the concave groove 17.

  Next, the valve body 3 is inserted into the valve box 2 and disposed between the hub seat portions 11 and 12, and the one side valve stem 4a is inserted into the one side valve stem insertion hole 7a. The valve body 4 is connected to the valve body 3 through the through hole 27, and the other side valve rod 4 b is inserted into the other side valve rod insertion hole 7 b and is connected to the valve body 3 through the through hole 27 of the hub seat portion 12.

After assembling the butterfly valve 1 as described above, by rotating the valve rods 4a and 4b, the valve body 3 rotates around the rotation axis 8, and the flow path 6 in the valve box 2 is opened and closed. The
As shown in FIG. 1, since the hub seal surface 19 of the hub seat portion 11 on one side is in pressure contact with the end surface 3a of the valve body boss portion on one side of the valve body 3, the hub seat portion 11 on one side and the valve body 3 The gap is sealed over the entire circumference of the hub seat portion 11. Similarly, since the hub seal surface 20 of the hub seat portion 12 on the other side is in pressure contact with the end surface 3b of the valve body boss portion on the other side of the valve body 3, the hub seat portion is between the hub seat portion 12 on the other side and the valve body 3. Sealed over 12 circumferences.

  As described above, the hub seat portions 11 and 12 of the seat member 10 are formed by the hub seal surfaces 19 and 20 by part of the hub end surfaces 110 and 120 facing the valve element boss portion end surfaces 3a and 3b. While sealing the periphery of the valve stems 4a and 4b, the friction surfaces between the hub seal surfaces 19 and 20 and the valve body boss portion end surfaces 3a and 3b, which cause friction in the shaft seal portion, can be reduced. Torque required for rotation can be reduced.

  Further, the hub seat portions 11 and 12 can be prevented from being deformed by the convex portions 111 and 121 slidably contacting the valve body boss portion end surfaces 3a and 3b supporting the hub sheet portions 11 and 12, and are not in contact with the valve body boss portion end surface 3a. Due to the presence of the recess 112, the torque can be reduced by reducing the friction surface.

Further, since the convex portions 111 and 121 surround the valve rods 4a and 4b and form an annular shape, a sealing effect can be achieved, and the multiple seal function can be realized by the hub seal surfaces 19 and 20.
In each of the above embodiments, as shown in FIG. 5, the hub sheet portions 11 and 12 and the peripheral sheet portions 13 and 14 are formed in an integrated structure, but the hub sheet portions 11 and 12 and the peripheral sheet portions 13 and 14 are May be separated to form a separate structure.

Figure 7 shows another configuration, in the same as the components definitive for the previous configuration description thereof is omitted by the same symbol. In FIG. 7, the hub seat portions 11 and 12 are annular ridges in which a part including the inner peripheral edge portions of the hub end surfaces 110 and 120 around the valve rods 4a and 4b is in sliding contact with the valve body boss end surfaces 3a and 3b in a watertight manner. Parts 118 and 128 are formed. The protrusions 118 and 128 have an inner diameter equal to the inner diameter of the inner circumferential space (through hole) 27 of the hub seat parts 11 and 12, and the protrusions 118 and 128 are inner peripheral surfaces and are watertight with the outer peripheral surfaces of the valve rods 4a and 4b. Slid in contact. The protrusions 118 and 128 have a shape that tapers toward the valve body boss part end faces 3a and 3b in a cross section along the axis of the valve rods 4a and 4b.
The basic configuration of the present invention is the same as that shown in FIGS. 1 to 5, and members that perform the same function are denoted by the same reference numerals and description thereof is omitted. In the present invention, as shown in FIG. 8, protrusions 118 and 128 and protrusions 111 and 121 are provided side by side.

  With this configuration, even if the sealing performance of the hub seal surfaces 19 and 20 is impaired due to some cause, the protrusions 118 and 128 are watertight with the valve body boss portion end surfaces 3a and 3b and the valve rods 4a and 4b. It is possible to ensure sealing performance by sliding contact with the inner surface of the ridges 118 and 128 due to the pressure of fluid entering between the hub seal surfaces 19 and 20 and the ridges 118 and 128. It is pressed by the outer peripheral surfaces of the rods 4a and 4b to improve the sealing performance (self-water-stopping). At this time, the protrusions 118 and 128 are highly flexible by tapering toward the end face 3a and 3b of the valve body boss in the cross section along the axial center of the valve stem 4a and 4b. The protrusions 118 and 128 are reliably pressed against the valve rods 4a and 4b by the pressure.

DESCRIPTION OF SYMBOLS 1 Butterfly valve 2 Valve box 3 Valve body 3a, 3b Valve body boss part end surface 4a, 4b Valve rod 10 Sheet member 11, 12 Hub sheet part 13, 14 Peripheral sheet part 17 Groove 18 Filler 19, 20 Hub seal surface 23 Filler Injection hole 25 Air discharge hole 27 Through hole 110, 120 Hub end surface 111, 121 Protruding part 112, 122 Concave part 118, 128 Projection part 201, 202 Valve box boss part 301, 302 Valve body boss part

Claims (1)

A butterfly that inserts the valve stem into the valve box boss portion of the valve box and the through hole of the hub seat portion of the seat member disposed in the valve box, and connects and fixes the valve body and the valve body boss portion of the valve body disposed in the valve box. In the valve, the hub seat portion includes an annular hub seal surface in which a part including the outer peripheral edge portion of the hub end surface around the valve stem is in water-tight sliding contact with the valve body boss end surface,
The hub seal surface has an inner diameter larger than the inner diameter of the through hole of the hub seat portion, and the hub seat portion includes a plurality of concentric circles in which a part including the inner peripheral edge portion of the hub end surface around the valve stem is in sliding contact with the end face of the valve body boss portion. An annular ridge of
The protrusion with the smallest diameter has an inner diameter equal to the inner diameter of the through hole of the hub seat part, the protrusion is in sliding contact with the outer peripheral surface of the valve stem on the inner peripheral surface, and the protrusion is along the axis of the valve stem. In the cross section, it has a shape that tapers towards the end face of the valve boss,
The ridge portion having a diameter larger than the ridge portion having the smallest diameter is a butterfly characterized in that the surface facing the end face of the valve body boss portion is a flat surface orthogonal to the axis of the through hole of the hub seat portion. valve.

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