WO2022269785A1 - Butterfly valve - Google Patents

Butterfly valve Download PDF

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Publication number
WO2022269785A1
WO2022269785A1 PCT/JP2021/023705 JP2021023705W WO2022269785A1 WO 2022269785 A1 WO2022269785 A1 WO 2022269785A1 JP 2021023705 W JP2021023705 W JP 2021023705W WO 2022269785 A1 WO2022269785 A1 WO 2022269785A1
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WO
WIPO (PCT)
Prior art keywords
shaft
housing
seal member
butterfly valve
stepped portion
Prior art date
Application number
PCT/JP2021/023705
Other languages
French (fr)
Japanese (ja)
Inventor
宗一郎 佐野
佳奈 小北
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2021/023705 priority Critical patent/WO2022269785A1/en
Publication of WO2022269785A1 publication Critical patent/WO2022269785A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing

Definitions

  • the present disclosure relates to butterfly valves.
  • Patent Document 1 discloses a butterfly valve.
  • a shaft having a valve body is rotatably supported by a housing. Rotation of the shaft causes the valve body to open and close a flow path formed in the housing.
  • a shaft seal ring and a valve body seal ring are provided annularly around the shaft. These keep the butterfly valve airtight by contacting each other along the entire circumference.
  • the pressure acting on the surface of the valve body facing the upstream side is greater than the pressure acting on the surface of the valve body facing the downstream side.
  • the pressure difference between them becomes the largest, reaching close to about 600 kPa, for example.
  • the present disclosure has been made to solve the above problems, and is a butterfly butterfly that can suppress deterioration of airtightness even when the shaft and bush wear and the shaft is eccentric or inclined.
  • the purpose is to provide a valve.
  • a butterfly valve includes a housing in which a flow path is formed, a valve body that opens and closes the flow path, a shaft that is rotatably supported by the housing, and an annular shaft that is provided on the outer peripheral surface of the shaft. a seal member, an annular housing-side seal member provided in the housing and facing the shaft-side seal member, a shaft-side stepped portion formed on the outer peripheral portion of the shaft-side seal member, and an inner peripheral portion of the housing-side seal member.
  • a housing-side stepped portion is formed and is in contact with the shaft-side stepped portion, and the axial center of the housing-side seal member is eccentric to the downstream side of the flow path with respect to the axial center of the shaft.
  • a butterfly valve includes a housing in which a flow path is formed, a valve body that opens and closes the flow path, a shaft that is rotatably supported by the housing, and an annular shaft that is provided on the outer peripheral surface of the shaft. a seal member, an annular housing-side seal member provided in the housing and facing the shaft-side seal member, a shaft-side stepped portion formed on the outer peripheral portion of the shaft-side seal member, and an inner peripheral portion of the housing-side seal member.
  • a housing-side stepped portion is formed and is in contact with the shaft-side stepped portion, and the axial center of the shaft-side seal member is eccentric to the upstream side of the flow path with respect to the axial center of the shaft.
  • FIG. 1 is a diagram showing the configuration of a valve system to which a butterfly valve according to Embodiment 1 is applied;
  • FIG. 1 is a longitudinal sectional view showing the configuration of a butterfly valve according to Embodiment 1;
  • FIG. 4 is a longitudinal sectional view showing a shaft sealing structure on one end side of the butterfly valve; 4 is a sectional view taken along line IV-IV in FIG. 3;
  • FIG. 4 is an enlarged view of a V portion of FIG. 3;
  • FIG. 4 is a vertical cross-sectional view showing a state in which the shaft and bush are worn when the valve body closes the passage;
  • 7 is a cross-sectional view taken along line VII-VII of FIG. 6;
  • FIG. 4 is a vertical cross-sectional view showing a state in which the shaft and the bush are worn and the shaft is eccentric toward the downstream side with respect to the bush.
  • FIG. 4 is a longitudinal sectional view showing a state in which the shaft and the bush are worn and the shaft is eccentric toward the upstream side with respect to the bush.
  • FIG. 4 is a vertical cross-sectional view showing a state in which the shaft and the bush are worn and the shaft is inclined toward the upstream side with respect to the bush.
  • FIG. 11 is an enlarged view of a main portion of FIG. 10; 11A is an enlarged view of section XIA of FIG. 10.
  • FIG. 11B is an enlarged view of the XIB portion of FIG. 10.
  • FIG. 15 is an operation diagram continued from FIG. 14 and is a vertical cross-sectional view showing a state in which the shaft is further inclined toward the upstream side with respect to the bush.
  • Embodiment 1 A butterfly valve 10 according to Embodiment 1 will be described with reference to FIGS. 1 to 11.
  • FIG. 1 A butterfly valve 10 according to Embodiment 1 will be described with reference to FIGS. 1 to 11.
  • FIG. 1 is a diagram showing the configuration of a valve system to which a butterfly valve 10 according to Embodiment 1 is applied.
  • FIG. 2 is a vertical cross-sectional view showing the structure of the butterfly valve 10 according to Embodiment 1.
  • FIG. 3 is a longitudinal sectional view showing a shaft sealing structure on one end side of the butterfly valve 10.
  • FIG. 4 is a sectional view taken along line IV-IV of FIG. 3.
  • FIG. 5 is an enlarged view of the V portion of FIG. 3.
  • FIG. 1 and 2 show the butterfly valve 10 in a fully open state.
  • 1 is a view of the housing 20 viewed from the outlet 23 side of the flow path 21.
  • FIG. 1 is a view of the housing 20 viewed from the outlet 23 side of the flow path 21.
  • the valve system shown in FIG. 1 is, for example, an exhaust valve system mounted on a vehicle.
  • This valve system comprises a butterfly valve 10 and an actuator 50 .
  • the butterfly valve 10 corresponds to, for example, an exhaust throttle valve.
  • the actuator 50 opens and closes the butterfly valve 10 .
  • the butterfly valve 10 and the actuator 50 are connected using lever members 31, 32, a plate 33, pins 34, 35, and the like.
  • Actuator 50 rotatably supports shaft 51 .
  • the butterfly valve 10 rotatably supports a shaft 12, which will be described later in detail.
  • lever member 31 One end of the lever member 31 is fixed to the shaft 51 of the actuator 50 .
  • the other end of the lever member 31 is rotatably supported by one end of the lever member 32 via a pin 34 .
  • the other end of the lever member 32 is rotatably supported with respect to one end of the plate 33 via a pin 35 .
  • plate 33 secures shaft 12 of butterfly valve 10 . Therefore, the lever members 31 and 32 and the plate 33 rotate in conjunction with the driving of the actuator 50 .
  • the butterfly valve 10 includes a valve body 11, a shaft 12, a bush 13, a shaft side seal member 14 (hereinafter simply referred to as seal member 14), a housing side seal member 15 (hereinafter simply referred to as seal member 14). 14), a spring 16, and a housing 20.
  • the housing 20 has a flow path 21, an inlet 22, an outlet 23, a shaft through portion 24, a shaft support hole 25, and a shaft sealing hole 26.
  • the flow path 21 is for flowing the exhaust gas that becomes a fluid.
  • the cross section of this flow path 21 is circular (see FIG. 1).
  • the direction of arrow G shown in FIG. 2 indicates the flow direction of the exhaust gas.
  • the channel 21 has an inlet 22 and an outlet 23 .
  • the inlet 22 is an upstream opening of the flow path 21 and is connected to the exhaust side of the engine (not shown).
  • Outlet 23 is a downstream opening of flow path 21 and is connected to the intake side of the engine.
  • the shaft through portion 24 is formed to project outward from the outer peripheral surface of the housing 20 . Further, the shaft through portion 24 is formed in a cylindrical shape and communicates with the flow path 21 . A shaft support hole 25 and a shaft sealing hole 26 are formed inside the shaft through portion 24 .
  • the shaft support hole 25 is arranged inside the shaft through portion 24 in the axial direction.
  • the shaft sealing hole 26 is arranged axially outside the shaft through portion 24 .
  • the diameter of the shaft sealing hole 26 is larger than the diameter of the shaft sealing hole 26 .
  • the other shaft support hole 25 is formed in the portion of the channel 21 facing the shaft support hole 25 of the shaft through portion 24 .
  • the valve body 11 opens and closes the channel 21 .
  • the valve body 11 has a disk shape and is arranged inside the flow path 21 .
  • the shaft 12 supports the valve body 11 so as to penetrate the center of the valve body 11 in its radial direction.
  • One end of the shaft 12 passes through the shaft through portion 24 and is fixed to the through hole of the plate 33 .
  • One end of the shaft 12 is rotatably supported in a shaft support hole 25 of a shaft through portion 24 via a bush 13 .
  • the other end side of the shaft 12 is rotatably supported by the housing 20 via the other shaft support hole 25 via the bush 13 .
  • annular sealing members 14 and 15 are provided in the shaft sealing hole 26 .
  • the seal members 14 and 15 are made of metal material. Therefore, even if the sealing members 14 and 15 are exposed to high-temperature exhaust gas, their sealing performance is not deteriorated.
  • the seal member 14 is fixed to the outer peripheral surface of the shaft 12 .
  • the seal member 15 is fixed in the shaft seal hole 26 .
  • the outer peripheral portion of the seal member 14 and the inner peripheral portion of the seal member 15 are arranged to face each other in the axial and radial directions of the shaft 12 .
  • the seal member 14 has a plurality of shaft-side stepped portions 14a (hereinafter simply referred to as stepped portions 14a) on its outer peripheral portion.
  • the surface of the step portion 14a serves as a sealing surface.
  • FIG. 2 shows an example in which the seal member 14 has two stepped portions 14a.
  • the seal member 15 has a plurality of housing-side stepped portions 15a (hereinafter simply referred to as stepped portions 15a) on its inner peripheral surface.
  • the surface of the stepped portion 15a serves as a sealing surface.
  • FIG. 2 shows an example in which the seal member 15 has three stepped portions 15a. As shown in FIG. 2, the stepped portion 14a and the stepped portion 15a are arranged so as to contact each other in the axial direction when the shaft 12 and the bushing 13 are not worn.
  • the axis Os of the seal member 14 is coaxial with the axis of the shaft 12 when the shaft 12 and bush 13 are not worn. Further, the axial center Oh of the seal member 15 is eccentric to the downstream side of the flow path 21 with respect to the axial center of the shaft 12 .
  • an upstream radial gap Hu (hereinafter simply referred to as gap Hu) is formed.
  • a downstream radial gap Hd (hereinafter simply referred to as gap Hd) is formed in a downstream portion between the stepped portion 14a of the sealing member 14 and the stepped portion 15a of the sealing member 15 .
  • the gap Hd is wider than the gap Hu because the axial center Oh of the seal member 15 is eccentric to the downstream side of the flow path 21 with respect to the axial center of the shaft 12 .
  • the spring 16 is provided in a compressed state between the housing 20 and the plate 33.
  • the spring 16 is arranged around the shaft through portion 24 of the housing 20 .
  • One end of spring 16 is supported by housing 20 .
  • the other end of spring 16 is supported by plate 33 .
  • the spring force F of the spring 16 acts on the plate 33. Therefore, the plate 33 is pressed outward in the axial direction, and the shaft 12 fixed at one end to the plate 33 is pulled out from the shaft through portion 24 . As a result, the stepped portion 15a of the seal member 14 fixed to the shaft 12 presses the stepped portion 15a of the seal member 15 fixed to the shaft sealing hole 26 from the inside to the outside in the axial direction. For this reason, in the butterfly valve 10, the seal members 14 and 15 formed of a metal material isolate the inside and outside of the flow path 21, and the exhaust gas leaks from the flow path 21 to the outside. Intrusion of air or liquid from the outside into the channel 21 is prevented.
  • FIG. 6 is a vertical cross-sectional view showing a state in which the shaft 12 and the bush 13 are worn when the flow path of the valve body 11 is closed.
  • 7 is a cross-sectional view taken along line VII-VII in FIG. 6.
  • the outer peripheral surface of the shaft 12 is rotatably supported by the inner peripheral surface of the bush 13 . For this reason, the wear that occurs on the outer peripheral surface of the shaft 12 progresses radially inward over time. Further, the wear generated on the inner peripheral surface of the bush 13 advances radially outward over time.
  • the pressure acting on the surface of the valve body 11 facing the upstream side is higher than the pressure acting on the surface facing the downstream side of the valve body 11. growing.
  • a strong load acting from the upstream side to the downstream side acts on the valve body 11 and the shaft 12.
  • the bush 13 receives and supports the shaft 12 pressed by the strong load. For this reason, a high surface pressure is generated in the portion where the outer peripheral surface of the shaft 12 and the inner peripheral surface of the bush 13 are in contact with each other, and wear accelerates most at that portion.
  • an upstream radial clearance Mu (hereinafter simply referred to as clearance Mu) is formed in the upstream portion between the outer peripheral surface of the shaft 12 and the inner peripheral surface of the bush 13 .
  • a downstream radial gap Md (hereinafter simply referred to as gap Md) is formed in a downstream portion between the outer peripheral surface of the shaft 12 and the inner peripheral surface of the bush 13 .
  • the clearances Mu and Md are clearances wider than clearances required for the bush 13 to rotatably support the shaft 12 . At this time, the gap Md is much wider than the gap Mu.
  • FIG. 8 the action of the butterfly valve 10 will be explained using FIGS. 8 to 11.
  • FIG. 8 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric toward the downstream side with respect to the bush 13.
  • the shaft 12 is not restrained by the bush 13 due to the gaps Mu and Md.
  • the eccentricity of shaft 12 is biased downstream where wear is more pronounced.
  • the stepped portion 14a of the seal member 14 is in contact with the stepped portion 15a of the seal member 15 even if the shaft 12 is extremely eccentric toward the downstream side due to wear. In this way, since the surface contact between the stepped portions 14a and 15a is maintained, the airtightness of the butterfly valve 10 is not lowered.
  • FIG. 9 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric toward the upstream side with respect to the bush 13.
  • the shaft 12 is extremely eccentric toward the upstream side due to wear, but is not pressed against the bush 13 by the load due to the pressure difference. Therefore, the shaft 12 and bushing 13 are hardly worn.
  • the stepped portion 14a of the sealing member 14 is in contact with the stepped portion 15a of the sealing member 15 while narrowing the gap Hu. In this way, since the surface contact between the stepped portions 14a and 15a is maintained, the airtightness of the butterfly valve 10 is not lowered.
  • FIG. 10 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is tilted toward the upstream side with respect to the bush 13.
  • FIG. 11 is an enlarged view of a main part of FIG. 10.
  • the inclination direction of the shaft 12 is the direction in which the one end side in which the seal member 14 is provided is inclined.
  • the seal member 14 When the shaft 12 inclines toward the upstream side due to wear, the seal member 14 also inclines accordingly.
  • the stepped portion 14 a of the inclined seal member 14 engages with the stepped portion 15 a of the seal member 15 . Since the contact between the stepped portions 14a and 15a is maintained in this way, the airtightness of the butterfly valve 10 does not deteriorate.
  • the axis Os of the seal member 14 when the shaft 12 and bushing 13 are not worn, the axis Os of the seal member 14 is coaxial with the axis of the shaft 12, and the axis Os of the seal member 15 Oh is eccentric to the downstream side of the flow path 21 with respect to the axial center of the shaft 12 .
  • the axis Os of the seal member 15 when the shaft 12 and bushing 13 are not worn, the axis Os of the seal member 15 is coaxial with the axis of the shaft 12, and the axis Oh of the seal member 14 is aligned with the shaft 12. may be eccentric to the upstream side of the flow path 21 with respect to the axis of .
  • the axial center Os of the sealing member 14 is coaxial with the axial center of the shaft 12, and the inner peripheral portion (stepped portion 15a) of the sealing member 15 is It may have an elongated hole shape extending downstream.
  • the eccentric direction of the seal member 15 can be adjusted by the rotation angle.
  • the butterfly valve 10 has the housing 20 in which the flow path 21 is formed, the valve element 11 that opens and closes the flow path 21, the shaft 12 that is rotatably supported by the housing 20, An annular seal member 14 provided on the outer peripheral surface of the shaft 12, an annular seal member 15 provided on the housing 20 and facing the seal member 14, a stepped portion 14a formed on the outer peripheral portion of the seal member 14, and a seal.
  • a stepped portion 15a is formed on the inner peripheral portion of the member 15 and is in contact with the stepped portion 14a. . Therefore, even if the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric or inclined, the butterfly valve 10 can suppress deterioration of airtightness.
  • the butterfly valve 10 has a housing 20 in which a flow path 21 is formed, a valve element 11 that opens and closes the flow path 21, a shaft 12 that is rotatably supported by the housing 20, An annular seal member 14 provided on the outer peripheral surface of the shaft 12, an annular seal member 15 provided on the housing 20 and facing the seal member 14, a stepped portion 14a formed on the outer peripheral portion of the seal member 14, and a seal.
  • a stepped portion 15a is formed on the inner peripheral portion of the member 15 and is in contact with the stepped portion 14a. . Therefore, even if the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric or inclined, the butterfly valve 10 can suppress deterioration of airtightness.
  • the butterfly valve 10 interlocks with the drive of the actuator 50 that rotates the shaft 12, and is provided between a plate 33 fixed to one end of the shaft 12 and the housing 20 and the plate 33, and the plate 33 is connected to the shaft. and a spring 16 that presses outward in the axial direction. Therefore, the butterfly valve 10 can always press the stepped portion 14 a of the sealing member 14 against the stepped portion 15 a of the sealing member 15 .
  • Embodiment 2 A butterfly valve 10A according to Embodiment 2 will be described with reference to FIGS. 12 to 15.
  • FIG. It should be noted that configurations having functions similar to those of the configuration described in Embodiment 1 are denoted by the same reference numerals, and descriptions thereof are omitted.
  • FIG. 12 is a longitudinal sectional view showing the configuration of a butterfly valve 10A according to Embodiment 2.
  • FIG. 13 is an enlarged view of the XIII part of FIG. 12.
  • FIG. FIG. 14 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is tilted toward the upstream side with respect to the bush 13.
  • FIG. 15 is an operation diagram following FIG. 14, and is a vertical cross-sectional view showing a state in which the shaft 12 is further inclined toward the upstream side with respect to the bush 13. As shown in FIG.
  • a butterfly valve 10A according to the second embodiment has a structure in which corners 14b and 15b that are R-shaped or C-chamfered are added to the structure of the butterfly valve 10 according to the first embodiment.
  • the sealing member 14 has a corner portion 14b of the stepped portion 14a rounded or chamfered.
  • the corner 15b of the stepped portion 15a is rounded or chamfered.
  • FIG. 14 the action of the butterfly valve 10A will be explained using FIGS. 14 and 15.
  • FIG. 14 the action of the butterfly valve 10A will be explained using FIGS. 14 and 15.
  • the seal member 14 is also tilted accordingly.
  • the stepped portion 14 a of the inclined seal member 14 engages with the stepped portion 15 a of the seal member 15 . Since the contact between the stepped portions 14a and 15a is maintained in this way, the airtightness of the butterfly valve 10 does not deteriorate.
  • the corner portion 14b of the stepped portion 14a and the corner portion 15b of the stepped portion 15a are rounded. Therefore, the butterfly valve 10A can suppress deterioration of airtightness even when the shaft 12 is greatly inclined and the corners 14b, 15b of the stepped portions 14a, 15a cross each other.
  • the corner portion 14b of the stepped portion 14a and the corner portion 15b of the stepped portion 15a are chamfered. Therefore, the butterfly valve 10A can suppress deterioration of airtightness even when the shaft 12 is greatly inclined and the corners 14b, 15b of the stepped portions 14a, 15a cross each other.
  • the present disclosure can freely combine each embodiment, modify any component of each embodiment, or omit any component in each embodiment. .
  • the axial center of the seal member is eccentric with respect to the axial center of the shaft, it is possible to suppress deterioration in airtightness, and it is suitable for use in butterfly valves and the like.
  • valve body 11 valve body, 12 shaft, 13 bushing, 14 shaft side seal member, 14a shaft side step portion, 14b corner portion, 15 housing side seal member, 15a housing side step portion, 15b corner portion, 16 spring , 20 housing, 21 flow path, 22 inlet, 23 outlet, 24 shaft through portion, 25 shaft support hole, 26 shaft sealing hole, 31, 32 lever member, 33 plate, 34, 35 pin, 50 actuator, 51 shaft, Os, Oh axis center, Hu, Hd, Mu, Md gap, F spring force.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)

Abstract

This butterfly valve (10) comprises: a housing (20) in which a flow path (21) is formed; a shaft (12) that is rotatably supported by the housing (20) and that has a valve body (11) which opens and closes the flow path (21); an annular sealing member (14) that is provided on the outer circumferential surface of the shaft (12); an annular sealing member (15) that is provided to the housing (20) and that opposes the sealing member (14); a step part (14a) that is formed at the outer circumferential portion of the sealing member (14); and a step part (15a) that is formed at the inner circumferential portion of the sealing member (15) and that is in contact with the step part (14a). The central axis (Oh) of the sealing member (15) is deviated from the central axis of the shaft (12) toward the downstream side of the flow path (21).

Description

バタフライバルブbutterfly valve
　本開示は、バタフライバルブに関する。 The present disclosure relates to butterfly valves.
　特許文献１には、バタフライバルブが開示されている。このバタフライバルブにおいては、弁体を備えるシャフトが、ハウジングに回転可能に支持されている。シャフトが回転することで、弁体がハウジングに形成される流路を開閉する。また、シャフトの周囲には、軸封リングと弁体シールリングとが環状に設けられている。これらは、互いに全周で接触することで、バタフライバルブの気密性を保持している。 Patent Document 1 discloses a butterfly valve. In this butterfly valve, a shaft having a valve body is rotatably supported by a housing. Rotation of the shaft causes the valve body to open and close a flow path formed in the housing. A shaft seal ring and a valve body seal ring are provided annularly around the shaft. These keep the butterfly valve airtight by contacting each other along the entire circumference.
特開２００３－２３２４５１号公報JP-A-2003-232451
　ここで、例えば、特許文献１に開示されたバタフライバルブを、車両の排気用スロットルバルブに適用する場合、流路を流れる排気ガスの温度が、約８００℃近くに達することから、軸封リング及び弁体シールリングを金属材料で形成する必要がある。 Here, for example, when the butterfly valve disclosed in Patent Document 1 is applied to an exhaust throttle valve of a vehicle, the temperature of the exhaust gas flowing through the flow path reaches nearly 800° C. It is necessary to form the valve body seal ring from a metal material.
　また、弁体における上流側を向く面に作用する圧力は、弁体における下流側を向く面に作用する圧力よりも大きい。特に、弁体が流路を閉鎖している場合、それらの間の圧力差は、最も大きくなり、例えば、約６００ｋＰａ近くに達する。 Also, the pressure acting on the surface of the valve body facing the upstream side is greater than the pressure acting on the surface of the valve body facing the downstream side. In particular, when the valve body closes the flow path, the pressure difference between them becomes the largest, reaching close to about 600 kPa, for example.
　このような、弁体の流路閉鎖時において、シャフトがブッシュを介してハウジングに回転可能に支持されている場合、シャフトがブッシュに対して下流側に向けて強く当接する。このため、シャフト及びブッシュは、摩耗するおそれがある。このように、シャフト及びブッシュが摩耗すると、それらの間に、必要以上の隙間が発生するため、シャフトは、ブッシュに対して、偏心又は傾斜する。この結果、軸封リングと弁体シールリングとが、互いに全周で接触できなくなり、特許文献１に開示されたバタフライバルブは、気密性を失ってしまう。 When the flow path of the valve body is closed like this, if the shaft is rotatably supported by the housing via the bush, the shaft strongly abuts the bush toward the downstream side. As a result, the shafts and bushings may wear out. Thus, when the shaft and bushing wear, an excessive clearance is created between them, causing the shaft to become eccentric or tilted with respect to the bushing. As a result, the shaft seal ring and the valve body seal ring cannot come into contact with each other over the entire circumference, and the butterfly valve disclosed in Patent Document 1 loses airtightness.
　本開示は、上記のような課題を解決するためになされたもので、シャフト及びブッシュが摩耗して、シャフトが偏心又は傾斜した場合であっても、気密性の低下を抑制することができるバタフライバルブを提供することを目的とする。 The present disclosure has been made to solve the above problems, and is a butterfly butterfly that can suppress deterioration of airtightness even when the shaft and bush wear and the shaft is eccentric or inclined. The purpose is to provide a valve.
　本開示に係るバタフライバルブは、流路が形成されるハウジングと、流路を開閉する弁体を有し、ハウジングに回転可能に支持されるシャフトと、シャフトの外周面に設けられる環状のシャフト側シール部材と、ハウジングに設けられ、シャフト側シール部材と対向する環状のハウジング側シール部材と、シャフト側シール部材の外周部に形成されるシャフト側段差部と、ハウジング側シール部材の内周部に形成され、シャフト側段差部と接触するハウジング側段差部とを備え、ハウジング側シール部材の軸心は、シャフトの軸心に対して流路の下流側に偏心されるものである。 A butterfly valve according to the present disclosure includes a housing in which a flow path is formed, a valve body that opens and closes the flow path, a shaft that is rotatably supported by the housing, and an annular shaft that is provided on the outer peripheral surface of the shaft. a seal member, an annular housing-side seal member provided in the housing and facing the shaft-side seal member, a shaft-side stepped portion formed on the outer peripheral portion of the shaft-side seal member, and an inner peripheral portion of the housing-side seal member. A housing-side stepped portion is formed and is in contact with the shaft-side stepped portion, and the axial center of the housing-side seal member is eccentric to the downstream side of the flow path with respect to the axial center of the shaft.
　本開示に係るバタフライバルブは、流路が形成されるハウジングと、流路を開閉する弁体を有し、ハウジングに回転可能に支持されるシャフトと、シャフトの外周面に設けられる環状のシャフト側シール部材と、ハウジングに設けられ、シャフト側シール部材と対向する環状のハウジング側シール部材と、シャフト側シール部材の外周部に形成されるシャフト側段差部と、ハウジング側シール部材の内周部に形成され、シャフト側段差部と接触するハウジング側段差部とを備え、シャフト側シール部材の軸心は、シャフトの軸心に対して流路の上流側に偏心されるものである。 A butterfly valve according to the present disclosure includes a housing in which a flow path is formed, a valve body that opens and closes the flow path, a shaft that is rotatably supported by the housing, and an annular shaft that is provided on the outer peripheral surface of the shaft. a seal member, an annular housing-side seal member provided in the housing and facing the shaft-side seal member, a shaft-side stepped portion formed on the outer peripheral portion of the shaft-side seal member, and an inner peripheral portion of the housing-side seal member. A housing-side stepped portion is formed and is in contact with the shaft-side stepped portion, and the axial center of the shaft-side seal member is eccentric to the upstream side of the flow path with respect to the axial center of the shaft.
　本開示によれば、シャフト及びブッシュが摩耗して、シャフトが偏心又は傾斜した場合であっても、気密性の低下を抑制することができる。 According to the present disclosure, even if the shaft and bush wear and the shaft becomes eccentric or inclined, it is possible to suppress a decrease in airtightness.
実施の形態１に係るバタフライバルブが適用されるバルブシステムの構成を示す図である。1 is a diagram showing the configuration of a valve system to which a butterfly valve according to Embodiment 1 is applied; FIG. 実施の形態１に係るバタフライバルブの構成を示す縦断面図である。1 is a longitudinal sectional view showing the configuration of a butterfly valve according to Embodiment 1; FIG. バタフライバルブの一端側における軸封構造を示す縦断面図である。FIG. 4 is a longitudinal sectional view showing a shaft sealing structure on one end side of the butterfly valve; 図３のIV-IV矢視断面図である。4 is a sectional view taken along line IV-IV in FIG. 3; FIG. 図３のＶ部の拡大図である。FIG. 4 is an enlarged view of a V portion of FIG. 3; 弁体の流路閉鎖時において、シャフト及びブッシュが摩耗したときの状態を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing a state in which the shaft and bush are worn when the valve body closes the passage; 図６のVII-VII矢視断面図である。7 is a cross-sectional view taken along line VII-VII of FIG. 6; FIG. シャフト及びブッシュが摩耗して、シャフトがブッシュに対して下流側に向けて偏心した状態を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing a state in which the shaft and the bush are worn and the shaft is eccentric toward the downstream side with respect to the bush. シャフト及びブッシュが摩耗して、シャフトがブッシュに対して上流側に向けて偏心した状態を示す縦断面図である。FIG. 4 is a longitudinal sectional view showing a state in which the shaft and the bush are worn and the shaft is eccentric toward the upstream side with respect to the bush. シャフト及びブッシュが摩耗して、シャフトがブッシュに対して上流側に向けて傾斜した状態を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing a state in which the shaft and the bush are worn and the shaft is inclined toward the upstream side with respect to the bush. 図１０の要部拡大図である。図１１Ａは、図１０のXIA部の拡大図である。図１１Ｂは、図１０のXIB部の拡大図である。FIG. 11 is an enlarged view of a main portion of FIG. 10; 11A is an enlarged view of section XIA of FIG. 10. FIG. 11B is an enlarged view of the XIB portion of FIG. 10. FIG. 実施の形態２に係るバタフライバルブの構成を示す縦断面図である。FIG. 6 is a vertical cross-sectional view showing the configuration of a butterfly valve according to Embodiment 2; 図１２のXIII部の拡大図である。13 is an enlarged view of part XIII of FIG. 12; FIG. シャフト及びブッシュが摩耗して、シャフトがブッシュに対して上流側に向けて傾斜した状態を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing a state in which the shaft and the bush are worn and the shaft is inclined toward the upstream side with respect to the bush. 図１４に続く動作図であって、シャフトがブッシュに対して更に上流側に向けて傾斜した状態を示す縦断面図である。FIG. 15 is an operation diagram continued from FIG. 14 and is a vertical cross-sectional view showing a state in which the shaft is further inclined toward the upstream side with respect to the bush.
　以下、本開示をより詳細に説明するために、本開示を実施するための形態について、添付の図面に従って説明する。 Hereinafter, in order to describe the present disclosure in more detail, embodiments for carrying out the present disclosure will be described according to the attached drawings.
実施の形態１．
　実施の形態１に係るバタフライバルブ１０について、図１から図１１を用いて説明する。 Embodiment 1.
A butterfly valve 10 according to Embodiment 1 will be described with reference to FIGS. 1 to 11. FIG.
　図１は、実施の形態１に係るバタフライバルブ１０が適用されるバルブシステムの構成を示す図である。図２は、実施の形態１に係るバタフライバルブ１０の構成を示す縦断面図である。図３は、バタフライバルブ１０の一端側における軸封構造を示す縦断面図である。図４は、図３のIV-IV矢視断面図である。図５は、図３のＶ部の拡大図である。なお、図１及び図２は、バタフライバルブ１０の全開状態を示している。また、図１は、ハウジング２０における流路２１の出口２３側から見た図である。 FIG. 1 is a diagram showing the configuration of a valve system to which a butterfly valve 10 according to Embodiment 1 is applied. FIG. 2 is a vertical cross-sectional view showing the structure of the butterfly valve 10 according to Embodiment 1. As shown in FIG. FIG. 3 is a longitudinal sectional view showing a shaft sealing structure on one end side of the butterfly valve 10. As shown in FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. FIG. 5 is an enlarged view of the V portion of FIG. 3. FIG. 1 and 2 show the butterfly valve 10 in a fully open state. 1 is a view of the housing 20 viewed from the outlet 23 side of the flow path 21. FIG.
　図１に示すバルブシステムは、例えば、車両に搭載される排気用バルブシステムである。このバルブシステムは、バタフライバルブ１０及びアクチュエータ５０を備えている。バタフライバルブ１０は、例えば、排気用スロットルバルブに相当するものである。アクチュエータ５０は、そのバタフライバルブ１０を開閉するものである。 The valve system shown in FIG. 1 is, for example, an exhaust valve system mounted on a vehicle. This valve system comprises a butterfly valve 10 and an actuator 50 . The butterfly valve 10 corresponds to, for example, an exhaust throttle valve. The actuator 50 opens and closes the butterfly valve 10 .
　バタフライバルブ１０とアクチュエータ５０とは、レバー部材３１，３２、プレート３３、及び、ピン３４，３５等を用いて接続されている。アクチュエータ５０は、シャフト５１を回転可能に支持している。また、詳細については後述するが、バタフライバルブ１０は、シャフト１２を回転可能に支持している。 The butterfly valve 10 and the actuator 50 are connected using lever members 31, 32, a plate 33, pins 34, 35, and the like. Actuator 50 rotatably supports shaft 51 . Further, the butterfly valve 10 rotatably supports a shaft 12, which will be described later in detail.
　レバー部材３１の一端は、アクチュエータ５０のシャフト５１に固定されている。レバー部材３１の他端は、ピン３４を介して、レバー部材３２の一端に対して、回転可能に支持されている。また、レバー部材３２の他端は、ピン３５を介して、プレート３３の一端に対して、回転可能に支持されている。更に、プレート３３は、バタフライバルブ１０のシャフト１２を固定している。このため、レバー部材３１，３２及びプレート３３は、アクチュエータ５０の駆動に連動して、回転する。 One end of the lever member 31 is fixed to the shaft 51 of the actuator 50 . The other end of the lever member 31 is rotatably supported by one end of the lever member 32 via a pin 34 . Also, the other end of the lever member 32 is rotatably supported with respect to one end of the plate 33 via a pin 35 . Furthermore, plate 33 secures shaft 12 of butterfly valve 10 . Therefore, the lever members 31 and 32 and the plate 33 rotate in conjunction with the driving of the actuator 50 .
　従って、アクチュエータ５０のシャフト５１が、一方の回転方向に向けて回転すると、バタフライバルブ１０のシャフト１２が、一方の回転方向に向けて回転する。このため、バタフライバルブ１０は、開く方向に回転する。また、アクチュエータ５０のシャフト５１が、他方の回転方向に向けて回転すると、バタフライバルブ１０のシャフト１２が、他方の回転方向に向けて回転する。このため、バタフライバルブ１０は、閉じる方向に回転する。 Therefore, when the shaft 51 of the actuator 50 rotates in one direction of rotation, the shaft 12 of the butterfly valve 10 rotates in one direction of rotation. Therefore, the butterfly valve 10 rotates in the opening direction. Further, when the shaft 51 of the actuator 50 rotates in the other rotational direction, the shaft 12 of the butterfly valve 10 rotates in the other rotational direction. Therefore, the butterfly valve 10 rotates in the closing direction.
　図２に示すように、バタフライバルブ１０は、弁体１１、シャフト１２、ブッシュ１３、シャフト側シール部材１４（以下、単に、シール部材１４と称す）、ハウジング側シール部材１５（以下、単に、シール部材１４と称す）、ばね１６、及び、ハウジング２０を有している。 As shown in FIG. 2, the butterfly valve 10 includes a valve body 11, a shaft 12, a bush 13, a shaft side seal member 14 (hereinafter simply referred to as seal member 14), a housing side seal member 15 (hereinafter simply referred to as seal member 14). 14), a spring 16, and a housing 20.
　ハウジング２０は、流路２１、入口２２、出口２３、軸貫通部２４、軸支持孔２５、軸封用孔２６を有している。 The housing 20 has a flow path 21, an inlet 22, an outlet 23, a shaft through portion 24, a shaft support hole 25, and a shaft sealing hole 26.
　流路２１は、流体となる排気ガスを流すためのものである。この流路２１の断面は、円形をなしている（図１参照）。なお、図２に示す矢印Ｇの向きは、排気ガスの流れ方向を示している。また、流路２１は、入口２２及び出口２３を有している。入口２２は、流路２１の上流側開口部であり、エンジン（図示省略）の排気側と接続されている。出口２３は、流路２１の下流側開口部であり、エンジンの吸気側と接続されている。 The flow path 21 is for flowing the exhaust gas that becomes a fluid. The cross section of this flow path 21 is circular (see FIG. 1). The direction of arrow G shown in FIG. 2 indicates the flow direction of the exhaust gas. Also, the channel 21 has an inlet 22 and an outlet 23 . The inlet 22 is an upstream opening of the flow path 21 and is connected to the exhaust side of the engine (not shown). Outlet 23 is a downstream opening of flow path 21 and is connected to the intake side of the engine.
　軸貫通部２４は、ハウジング２０の外周面から外側に向けて突出するように形成されている。また、軸貫通部２４は、円筒状に形成されており、流路２１と連通している。この軸貫通部２４の内部には、軸支持孔２５及び軸封用孔２６が形成されている。 The shaft through portion 24 is formed to project outward from the outer peripheral surface of the housing 20 . Further, the shaft through portion 24 is formed in a cylindrical shape and communicates with the flow path 21 . A shaft support hole 25 and a shaft sealing hole 26 are formed inside the shaft through portion 24 .
　軸支持孔２５は、軸貫通部２４の軸方向内側に配置されている。軸封用孔２６は、軸貫通部２４の軸方向外側に配置されている。軸封用孔２６の径は、軸封用孔２６の径よりも大きな径となっている。そして、軸貫通部２４の軸支持孔２５と対向する流路２１の部分には、他方の軸支持孔２５が形成されている。 The shaft support hole 25 is arranged inside the shaft through portion 24 in the axial direction. The shaft sealing hole 26 is arranged axially outside the shaft through portion 24 . The diameter of the shaft sealing hole 26 is larger than the diameter of the shaft sealing hole 26 . The other shaft support hole 25 is formed in the portion of the channel 21 facing the shaft support hole 25 of the shaft through portion 24 .
　弁体１１は、流路２１を開閉するものである。この弁体１１は、円盤状をなしており、流路２１の内部に配置されている。 The valve body 11 opens and closes the channel 21 . The valve body 11 has a disk shape and is arranged inside the flow path 21 .
　シャフト１２は、弁体１１をその径方向において中心を貫くように、当該弁体１１を支持している。シャフト１２の一端側は、軸貫通部２４を貫通して、プレート３３の貫通孔に固定されている。また、シャフト１２の一端側は、ブッシュ１３を介して、軸貫通部２４の軸支持孔２５に回転可能に支持されている。一方、シャフト１２の他端側は、ブッシュ１３を介して、他方の軸支持孔２５を介して、ハウジング２０に回転可能に支持されている。 The shaft 12 supports the valve body 11 so as to penetrate the center of the valve body 11 in its radial direction. One end of the shaft 12 passes through the shaft through portion 24 and is fixed to the through hole of the plate 33 . One end of the shaft 12 is rotatably supported in a shaft support hole 25 of a shaft through portion 24 via a bush 13 . On the other hand, the other end side of the shaft 12 is rotatably supported by the housing 20 via the other shaft support hole 25 via the bush 13 .
　ここで、軸封用孔２６には、環状をなすシール部材１４，１５が設けられている。このシール部材１４，１５は、金属材料で形成されている。このため、シール部材１４，１５は、高温の排気ガスに晒されても、シール性能が低下することはない。シール部材１４は、シャフト１２の外周面に固定されている。一方、シール部材１５は、軸封用孔２６に固定されている。そして、シール部材１４の外周部と、シール部材１５の内周部とは、シャフト１２の軸方向及び径方向において、互いに対向するように配置されている。 Here, annular sealing members 14 and 15 are provided in the shaft sealing hole 26 . The seal members 14 and 15 are made of metal material. Therefore, even if the sealing members 14 and 15 are exposed to high-temperature exhaust gas, their sealing performance is not deteriorated. The seal member 14 is fixed to the outer peripheral surface of the shaft 12 . On the other hand, the seal member 15 is fixed in the shaft seal hole 26 . The outer peripheral portion of the seal member 14 and the inner peripheral portion of the seal member 15 are arranged to face each other in the axial and radial directions of the shaft 12 .
　具体的には、シール部材１４は、その外周部に、複数のシャフト側段差部１４ａ（以下、単に、段差部１４ａと称す）を有している。段差部１４ａの表面が、シール面となる。図２は、シール部材１４が２つの段差部１４ａを有する例を示している。また、シール部材１５は、その内周面に、複数のハウジング側段差部１５ａ（以下、単に、段差部１５ａと称す）を有している。段差部１５ａの表面が、シール面となる。図２は、シール部材１５が３つの段差部１５ａを有する例を示している。図２に示すように、段差部１４ａと段差部１５ａとは、シャフト１２及びブッシュ１３が摩耗していない状態においては、互いに軸方向において接触するように配置されている。 Specifically, the seal member 14 has a plurality of shaft-side stepped portions 14a (hereinafter simply referred to as stepped portions 14a) on its outer peripheral portion. The surface of the step portion 14a serves as a sealing surface. FIG. 2 shows an example in which the seal member 14 has two stepped portions 14a. Further, the seal member 15 has a plurality of housing-side stepped portions 15a (hereinafter simply referred to as stepped portions 15a) on its inner peripheral surface. The surface of the stepped portion 15a serves as a sealing surface. FIG. 2 shows an example in which the seal member 15 has three stepped portions 15a. As shown in FIG. 2, the stepped portion 14a and the stepped portion 15a are arranged so as to contact each other in the axial direction when the shaft 12 and the bushing 13 are not worn.
　更に、図３及び図４に示すように、シャフト１２及びブッシュ１３が摩耗していない状態においては、シール部材１４の軸心Ｏｓは、シャフト１２の軸心と同軸である。また、シール部材１５の軸心Ｏｈは、シャフト１２の軸心に対して、流路２１の下流側に偏心している。 Furthermore, as shown in FIGS. 3 and 4, the axis Os of the seal member 14 is coaxial with the axis of the shaft 12 when the shaft 12 and bush 13 are not worn. Further, the axial center Oh of the seal member 15 is eccentric to the downstream side of the flow path 21 with respect to the axial center of the shaft 12 .
　このため、図４及び図５に示すように、シール部材１４の段差部１４ａとシール部材１５の段差部１５ａとの間の上流側部分には、上流側径方向隙間Ｈｕ（以下、単に、隙間Ｈｕと称す）が形成されている。また、シール部材１４の段差部１４ａとシール部材１５の段差部１５ａとの間の下流側部分には、下流側径方向隙間Ｈｄ（以下、単に、隙間Ｈｄと称す）が形成されている。このとき、シール部材１５の軸心Ｏｈが、シャフト１２の軸心に対して、流路２１の下流側に偏心している分、隙間Ｈｄは、隙間Ｈｕよりも広くなっている。 Therefore, as shown in FIGS. 4 and 5, an upstream radial gap Hu (hereinafter simply referred to as gap Hu) is formed. A downstream radial gap Hd (hereinafter simply referred to as gap Hd) is formed in a downstream portion between the stepped portion 14a of the sealing member 14 and the stepped portion 15a of the sealing member 15 . At this time, the gap Hd is wider than the gap Hu because the axial center Oh of the seal member 15 is eccentric to the downstream side of the flow path 21 with respect to the axial center of the shaft 12 .
　ばね１６は、ハウジング２０とプレート３３との間に圧縮状態で設けられている。このばね１６は、ハウジング２０の軸貫通部２４の周囲に配置されている。ばね１６の一端は、ハウジング２０に支持されている。ばね１６の他端は、プレート３３に支持されている。 The spring 16 is provided in a compressed state between the housing 20 and the plate 33. The spring 16 is arranged around the shaft through portion 24 of the housing 20 . One end of spring 16 is supported by housing 20 . The other end of spring 16 is supported by plate 33 .
　従って、ばね１６のばね力Ｆは、プレート３３に作用する。このため、プレート３３は、軸方向外側に向けて押圧され、当該プレート３３に対して一端側が固定されるシャフト１２は、軸貫通部２４から引き抜かれるように引っ張られる。この結果、シャフト１２に固定されるシール部材１４の段差部１５ａは、軸封用孔２６に固定されるシール部材１５の段差部１５ａに対して、軸方向内側から外側に向けて押圧する。このため、バタフライバルブ１０においては、流路２１の内部と外部との間が、金属材料で形成されるシール部材１４，１５によって遮断され、排気ガスの流路２１から外部への漏洩、及び、空気又は液体の外部から流路２１への浸入が、防止されている。 Therefore, the spring force F of the spring 16 acts on the plate 33. Therefore, the plate 33 is pressed outward in the axial direction, and the shaft 12 fixed at one end to the plate 33 is pulled out from the shaft through portion 24 . As a result, the stepped portion 15a of the seal member 14 fixed to the shaft 12 presses the stepped portion 15a of the seal member 15 fixed to the shaft sealing hole 26 from the inside to the outside in the axial direction. For this reason, in the butterfly valve 10, the seal members 14 and 15 formed of a metal material isolate the inside and outside of the flow path 21, and the exhaust gas leaks from the flow path 21 to the outside. Intrusion of air or liquid from the outside into the channel 21 is prevented.
　次に、シャフト１２及びブッシュ１３の摩耗について、図６及び図７を用いて説明する。図６は、弁体１１の流路閉鎖時において、シャフト１２及びブッシュ１３が摩耗したときの状態を示す縦断面図である。図７は、図６のVII-VII矢視断面図である。 Next, the wear of the shaft 12 and bushing 13 will be explained using FIGS. 6 and 7. FIG. FIG. 6 is a vertical cross-sectional view showing a state in which the shaft 12 and the bush 13 are worn when the flow path of the valve body 11 is closed. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG.
　シャフト１２の外周面は、ブッシュ１３の内周面に回転可能に支持されている。このため、シャフト１２の外周面に発生する摩耗は、経時的に、径方向内側に向けて進む。また、ブッシュ１３の内周面に発生する摩耗は、経時的に、径方向外側に向けて進む。 The outer peripheral surface of the shaft 12 is rotatably supported by the inner peripheral surface of the bush 13 . For this reason, the wear that occurs on the outer peripheral surface of the shaft 12 progresses radially inward over time. Further, the wear generated on the inner peripheral surface of the bush 13 advances radially outward over time.
　また、特に、弁体１１が流路２１を閉鎖している状態においては、弁体１１における上流側を向く面に作用する圧力は、弁体１１における下流側を向く面に作用する圧力よりも大きくなる。このように、弁体１１に対して上流側及び下流側の双方から作用する圧力間に大きな差が生じると、弁体１１及びシャフト１２には、上流側から下流側に向かう強い荷重が作用する。このとき、ブッシュ１３は、その強い荷重で押圧されたシャフト１２を受け止めて支持する。このため、シャフト１２の外周面とブッシュ１３の内周面とが互いに接触し合った部分には、高い面圧が生じ、その部分において、摩耗が最も促進する。 In particular, when the valve body 11 closes the flow path 21, the pressure acting on the surface of the valve body 11 facing the upstream side is higher than the pressure acting on the surface facing the downstream side of the valve body 11. growing. Thus, when there is a large difference between the pressures acting on the valve body 11 from both the upstream side and the downstream side, a strong load acting from the upstream side to the downstream side acts on the valve body 11 and the shaft 12. . At this time, the bush 13 receives and supports the shaft 12 pressed by the strong load. For this reason, a high surface pressure is generated in the portion where the outer peripheral surface of the shaft 12 and the inner peripheral surface of the bush 13 are in contact with each other, and wear accelerates most at that portion.
　この結果、シャフト１２の外周面とブッシュ１３の内周面との間の上流側部分には、上流側径方向隙間Ｍｕ（以下、単に、隙間Ｍｕと称す）が形成される。また、シャフト１２の外周面とブッシュ１３の内周面との間における下流側部分には、下流側径方向隙間Ｍｄ（以下、単に、隙間Ｍｄと称す）が形成される。隙間Ｍｕ，Ｍｄは、ブッシュ１３がシャフト１２を回転可能に支持するために必要な隙間よりも幅広となる隙間である。このとき、隙間Ｍｄは、隙間Ｍｕよりも遥かに幅広となっている。 As a result, an upstream radial clearance Mu (hereinafter simply referred to as clearance Mu) is formed in the upstream portion between the outer peripheral surface of the shaft 12 and the inner peripheral surface of the bush 13 . A downstream radial gap Md (hereinafter simply referred to as gap Md) is formed in a downstream portion between the outer peripheral surface of the shaft 12 and the inner peripheral surface of the bush 13 . The clearances Mu and Md are clearances wider than clearances required for the bush 13 to rotatably support the shaft 12 . At this time, the gap Md is much wider than the gap Mu.
　次に、バタフライバルブ１０の作用について、図８から図１１を用いて説明する。 Next, the action of the butterfly valve 10 will be explained using FIGS. 8 to 11. FIG.
　図８は、シャフト１２及びブッシュ１３が摩耗して、シャフト１２がブッシュ１３に対して下流側に向けて偏心した状態を示す縦断面図である。シャフト１２は、隙間Ｍｕ，Ｍｄが形成された分、ブッシュ１３に拘束されていない。シャフト１２の偏心は、摩耗が顕著な下流側に偏っている。このとき、シャフト１２が摩耗によって極端に下流側に向けて偏心した場合でも、シール部材１４の段差部１４ａは、シール部材１５の段差部１５ａに接触している。このように、段差部１４ａ，１５ａ同士の面接触が維持されるため、バタフライバルブ１０の気密性は、低下しない。 FIG. 8 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric toward the downstream side with respect to the bush 13. FIG. The shaft 12 is not restrained by the bush 13 due to the gaps Mu and Md. The eccentricity of shaft 12 is biased downstream where wear is more pronounced. At this time, the stepped portion 14a of the seal member 14 is in contact with the stepped portion 15a of the seal member 15 even if the shaft 12 is extremely eccentric toward the downstream side due to wear. In this way, since the surface contact between the stepped portions 14a and 15a is maintained, the airtightness of the butterfly valve 10 is not lowered.
　図９は、シャフト１２及びブッシュ１３が摩耗して、シャフト１２がブッシュ１３に対して上流側に向けて偏心した状態を示す縦断面図である。シャフト１２は、摩耗によって極端に上流側に向けて偏心しているが、上記圧力差による荷重によって、ブッシュ１３に対して押圧されていない。このため、シャフト１２及びブッシュ１３は、殆ど摩耗しない。このとき、シール部材１４の段差部１４ａは、隙間Ｈｕを狭めつつ、シール部材１５の段差部１５ａに接触している。このように、段差部１４ａ，１５ａ同士の面接触が維持されるため、バタフライバルブ１０の気密性は、低下しない。 FIG. 9 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric toward the upstream side with respect to the bush 13. FIG. The shaft 12 is extremely eccentric toward the upstream side due to wear, but is not pressed against the bush 13 by the load due to the pressure difference. Therefore, the shaft 12 and bushing 13 are hardly worn. At this time, the stepped portion 14a of the sealing member 14 is in contact with the stepped portion 15a of the sealing member 15 while narrowing the gap Hu. In this way, since the surface contact between the stepped portions 14a and 15a is maintained, the airtightness of the butterfly valve 10 is not lowered.
　図１０は、シャフト１２及びブッシュ１３が摩耗して、シャフト１２がブッシュ１３に対して上流側に向けて傾斜した状態を示す縦断面図である。図１１は、図１０の要部拡大図である。なお、シャフト１２の傾斜方向とは、シール部材１４が設けられた一端側が傾いた方向のことである。 FIG. 10 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is tilted toward the upstream side with respect to the bush 13. FIG. 11 is an enlarged view of a main part of FIG. 10. FIG. In addition, the inclination direction of the shaft 12 is the direction in which the one end side in which the seal member 14 is provided is inclined.
　シャフト１２が摩耗によって上流側に向けて傾斜すると、これに伴って、シール部材１４も傾斜する。この傾斜したシール部材１４の段差部１４ａは、シール部材１５の段差部１５ａと係止する。このように、段差部１４ａ，１５ａ同士の接触が維持されるため、バタフライバルブ１０の気密性は、低下しない。 When the shaft 12 inclines toward the upstream side due to wear, the seal member 14 also inclines accordingly. The stepped portion 14 a of the inclined seal member 14 engages with the stepped portion 15 a of the seal member 15 . Since the contact between the stepped portions 14a and 15a is maintained in this way, the airtightness of the butterfly valve 10 does not deteriorate.
　なお、上述した実施の形態においては、シャフト１２及びブッシュ１３が摩耗していない状態で、シール部材１４の軸心Ｏｓが、シャフト１２の軸心と同軸であり、また、シール部材１５の軸心Ｏｈが、シャフト１２の軸心に対して、流路２１の下流側に偏心している。これに対して、シャフト１２及びブッシュ１３が摩耗していない状態で、シール部材１５の軸心Ｏｓが、シャフト１２の軸心と同軸であり、また、シール部材１４の軸心Ｏｈが、シャフト１２の軸心に対して、流路２１の上流側に偏心しても良い。 In the above-described embodiment, when the shaft 12 and bushing 13 are not worn, the axis Os of the seal member 14 is coaxial with the axis of the shaft 12, and the axis Os of the seal member 15 Oh is eccentric to the downstream side of the flow path 21 with respect to the axial center of the shaft 12 . On the other hand, when the shaft 12 and bushing 13 are not worn, the axis Os of the seal member 15 is coaxial with the axis of the shaft 12, and the axis Oh of the seal member 14 is aligned with the shaft 12. may be eccentric to the upstream side of the flow path 21 with respect to the axis of .
　更に、シャフト１２及びブッシュ１３が摩耗していない状態で、シール部材１４の軸心Ｏｓが、シャフト１２の軸心と同軸であり、また、シール部材１５の内周部（段差部１５ａ）が、下流側に延びる長孔形状であっても良い。 Furthermore, in a state in which the shaft 12 and the bush 13 are not worn, the axial center Os of the sealing member 14 is coaxial with the axial center of the shaft 12, and the inner peripheral portion (stepped portion 15a) of the sealing member 15 is It may have an elongated hole shape extending downstream.
　そして、シャフト１２及びブッシュ１３の摩耗位置が、下流側から上流側に向けてずれている場合には、その回転角度分、シール部材１５の偏心方向を調整すれば良い。 Then, if the worn positions of the shaft 12 and the bush 13 deviate from the downstream side toward the upstream side, the eccentric direction of the seal member 15 can be adjusted by the rotation angle.
　以上、実施の形態１に係るバタフライバルブ１０は、流路２１が形成されるハウジング２０と、流路２１を開閉する弁体１１を有し、ハウジング２０に回転可能に支持されるシャフト１２と、シャフト１２の外周面に設けられる環状のシール部材１４と、ハウジング２０に設けられ、シール部材１４と対向する環状のシール部材１５と、シール部材１４の外周部に形成される段差部１４ａと、シール部材１５の内周部に形成され、段差部１４ａと接触する段差部１５ａとを備え、シール部材１５の軸心Ｏｈは、シャフト１２の軸心に対して流路２１の下流側に偏心される。このため、バタフライバルブ１０は、シャフト１２及びブッシュ１３が摩耗して、シャフト１２が偏心又は傾斜した場合であっても、気密性の低下を抑制することができる。 As described above, the butterfly valve 10 according to Embodiment 1 has the housing 20 in which the flow path 21 is formed, the valve element 11 that opens and closes the flow path 21, the shaft 12 that is rotatably supported by the housing 20, An annular seal member 14 provided on the outer peripheral surface of the shaft 12, an annular seal member 15 provided on the housing 20 and facing the seal member 14, a stepped portion 14a formed on the outer peripheral portion of the seal member 14, and a seal. A stepped portion 15a is formed on the inner peripheral portion of the member 15 and is in contact with the stepped portion 14a. . Therefore, even if the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric or inclined, the butterfly valve 10 can suppress deterioration of airtightness.
　また、実施の形態１に係るバタフライバルブ１０は、流路２１が形成されるハウジング２０と、流路２１を開閉する弁体１１を有し、ハウジング２０に回転可能に支持されるシャフト１２と、シャフト１２の外周面に設けられる環状のシール部材１４と、ハウジング２０に設けられ、シール部材１４と対向する環状のシール部材１５と、シール部材１４の外周部に形成される段差部１４ａと、シール部材１５の内周部に形成され、段差部１４ａと接触する段差部１５ａとを備え、シール部材１４の軸心Ｏｓは、シャフト１２の軸心に対して流路２１の上流側に偏心される。このため、バタフライバルブ１０は、シャフト１２及びブッシュ１３が摩耗して、シャフト１２が偏心又は傾斜した場合であっても、気密性の低下を抑制することができる。 Further, the butterfly valve 10 according to Embodiment 1 has a housing 20 in which a flow path 21 is formed, a valve element 11 that opens and closes the flow path 21, a shaft 12 that is rotatably supported by the housing 20, An annular seal member 14 provided on the outer peripheral surface of the shaft 12, an annular seal member 15 provided on the housing 20 and facing the seal member 14, a stepped portion 14a formed on the outer peripheral portion of the seal member 14, and a seal. A stepped portion 15a is formed on the inner peripheral portion of the member 15 and is in contact with the stepped portion 14a. . Therefore, even if the shaft 12 and the bush 13 are worn and the shaft 12 is eccentric or inclined, the butterfly valve 10 can suppress deterioration of airtightness.
　更に、バタフライバルブ１０は、シャフト１２を回転させるアクチュエータ５０の駆動と連動し、シャフト１２の一端に固定されるプレート３３と、ハウジング２０とプレート３３との間に設けられ、プレート３３を前記シャフトの軸方向外側に向けて押圧するばね１６とを備える。このため、バタフライバルブ１０は、シール部材１４の段差部１４ａをシール部材１５の段差部１５ａに対して、常に押し付けることができる。 Furthermore, the butterfly valve 10 interlocks with the drive of the actuator 50 that rotates the shaft 12, and is provided between a plate 33 fixed to one end of the shaft 12 and the housing 20 and the plate 33, and the plate 33 is connected to the shaft. and a spring 16 that presses outward in the axial direction. Therefore, the butterfly valve 10 can always press the stepped portion 14 a of the sealing member 14 against the stepped portion 15 a of the sealing member 15 .
実施の形態２．
　実施の形態２に係るバタフライバルブ１０Ａについて、図１２から図１５を用いて説明する。なお、実施の形態１で説明した構成と同様の機能を有する構成については、同一の符号を付し、その説明を省略する。 Embodiment 2.
A butterfly valve 10A according to Embodiment 2 will be described with reference to FIGS. 12 to 15. FIG. It should be noted that configurations having functions similar to those of the configuration described in Embodiment 1 are denoted by the same reference numerals, and descriptions thereof are omitted.
　図１２は、実施の形態２に係るバタフライバルブ１０Ａの構成を示す縦断面図である。図１３は、図１２のXIII部の拡大図である。図１４は、シャフト１２及びブッシュ１３が摩耗して、シャフト１２がブッシュ１３に対して上流側に向けて傾斜した状態を示す縦断面図である。図１５は、図１４に続く動作図であって、シャフト１２がブッシュ１３に対して更に上流側に向けて傾斜した状態を示す縦断面図である。 FIG. 12 is a longitudinal sectional view showing the configuration of a butterfly valve 10A according to Embodiment 2. FIG. 13 is an enlarged view of the XIII part of FIG. 12. FIG. FIG. 14 is a longitudinal sectional view showing a state in which the shaft 12 and the bush 13 are worn and the shaft 12 is tilted toward the upstream side with respect to the bush 13. As shown in FIG. FIG. 15 is an operation diagram following FIG. 14, and is a vertical cross-sectional view showing a state in which the shaft 12 is further inclined toward the upstream side with respect to the bush 13. As shown in FIG.
　実施の形態２に係るバタフライバルブ１０Ａは、実施の形態１に係るバタフライバルブ１０の構成に、Ｒ形状又はＣ面取り形状となる角部１４ｂ，１５ｂを加えた構造となっている。 A butterfly valve 10A according to the second embodiment has a structure in which corners 14b and 15b that are R-shaped or C-chamfered are added to the structure of the butterfly valve 10 according to the first embodiment.
　図１２及び図１３に示すように、シール部材１４は、段差部１４ａの角部１４ｂを、Ｒ形状又はＣ面取り形状としている。シール部材１５は、段差部１５ａの角部１５ｂを、Ｒ形状又はＣ面取り形状としている。 As shown in FIGS. 12 and 13, the sealing member 14 has a corner portion 14b of the stepped portion 14a rounded or chamfered. In the sealing member 15, the corner 15b of the stepped portion 15a is rounded or chamfered.
　次に、バタフライバルブ１０Ａの作用について、図１４及び図１５を用いて説明する。 Next, the action of the butterfly valve 10A will be explained using FIGS. 14 and 15. FIG.
　図１４に示すように、シャフト１２が摩耗によって上流側に向けて傾斜すると、これに伴って、シール部材１４も傾斜する。この傾斜したシール部材１４の段差部１４ａは、シール部材１５の段差部１５ａと係止する。このように、段差部１４ａ，１５ａ同士の接触が維持されるため、バタフライバルブ１０の気密性は、低下しない。 As shown in FIG. 14, when the shaft 12 is tilted toward the upstream side due to wear, the seal member 14 is also tilted accordingly. The stepped portion 14 a of the inclined seal member 14 engages with the stepped portion 15 a of the seal member 15 . Since the contact between the stepped portions 14a and 15a is maintained in this way, the airtightness of the butterfly valve 10 does not deteriorate.
　続いて、図１５に示すように、シャフト１２が更に上流側に向けて傾斜すると、当該シャフト１２の傾斜角度の増大に伴って、シール部材１４の段差部１４ａは、上流側に向けて傾斜する。このとき、シール部材１４の角部１４ｂは、シール部材１５の角部１５ｂを滑らかに乗り越える。このため、シャフト１２が傾斜した場合であっても、シール部材１４とシール部材１５との接触は、維持される。 Subsequently, as shown in FIG. 15, when the shaft 12 further tilts toward the upstream side, the stepped portion 14a of the seal member 14 tilts toward the upstream side as the tilt angle of the shaft 12 increases. . At this time, the corner portion 14b of the seal member 14 smoothly rides over the corner portion 15b of the seal member 15. As shown in FIG. Therefore, even if the shaft 12 is tilted, the contact between the seal members 14 and 15 is maintained.
　以上、実施の形態２に係るバタフライバルブ１０Ａにおいては、段差部１４ａの角部１４ｂ、及び、段差部１５ａの角部１５ｂは、Ｒ形状である。このため、バタフライバルブ１０Ａは、シャフト１２が大きく傾斜して、段差部１４ａ，１５ａの角部１４ｂ，１５ｂ同士が乗り越え合う場合でも、気密性の低下を抑制することができる。 As described above, in the butterfly valve 10A according to Embodiment 2, the corner portion 14b of the stepped portion 14a and the corner portion 15b of the stepped portion 15a are rounded. Therefore, the butterfly valve 10A can suppress deterioration of airtightness even when the shaft 12 is greatly inclined and the corners 14b, 15b of the stepped portions 14a, 15a cross each other.
　また、実施の形態２に係るバタフライバルブ１０Ａにおいては、段差部１４ａの角部１４ｂ、及び、段差部１５ａの角部１５ｂは、Ｃ面取り形状である。このため、バタフライバルブ１０Ａは、シャフト１２が大きく傾斜して、段差部１４ａ，１５ａの角部１４ｂ，１５ｂ同士が乗り越え合う場合でも、気密性の低下を抑制することができる。 Further, in the butterfly valve 10A according to Embodiment 2, the corner portion 14b of the stepped portion 14a and the corner portion 15b of the stepped portion 15a are chamfered. Therefore, the butterfly valve 10A can suppress deterioration of airtightness even when the shaft 12 is greatly inclined and the corners 14b, 15b of the stepped portions 14a, 15a cross each other.
　なお、本開示はその開示の範囲内において、各実施の形態の自由な組み合わせ、あるいは各実施の形態の任意の構成要素の変形、もしくは各実施の形態において任意の構成要素の省略が可能である。 In addition, within the scope of the disclosure, the present disclosure can freely combine each embodiment, modify any component of each embodiment, or omit any component in each embodiment. .
　本開示に係るバタフライバルブは、シール部材の軸心が、シャフトの軸心に対して偏心されるので、気密性の低下を抑制でき、バタフライバルブ等に用いるのに適している。 In the butterfly valve according to the present disclosure, since the axial center of the seal member is eccentric with respect to the axial center of the shaft, it is possible to suppress deterioration in airtightness, and it is suitable for use in butterfly valves and the like.
　１０，１０Ａ　バタフライバルブ、１１　弁体、１２　シャフト、１３　ブッシュ、１４　シャフト側シール部材、１４ａ　シャフト側段差部、１４ｂ　角部、１５　ハウジング側シール部材、１５ａ　ハウジング側段差部、１５ｂ　角部、１６　ばね、２０　ハウジング、２１　流路、２２　入口、２３　出口、２４　軸貫通部、２５　軸支持孔、２６　軸封用孔、３１，３２　レバー部材、３３　プレート、３４，３５　ピン、５０　アクチュエータ、５１　シャフト、Ｏｓ，Ｏｈ　軸心、Ｈｕ，Ｈｄ，Ｍｕ，Ｍｄ　隙間、Ｆ　ばね力。 10, 10A butterfly valve, 11 valve body, 12 shaft, 13 bushing, 14 shaft side seal member, 14a shaft side step portion, 14b corner portion, 15 housing side seal member, 15a housing side step portion, 15b corner portion, 16 spring , 20 housing, 21 flow path, 22 inlet, 23 outlet, 24 shaft through portion, 25 shaft support hole, 26 shaft sealing hole, 31, 32 lever member, 33 plate, 34, 35 pin, 50 actuator, 51 shaft, Os, Oh axis center, Hu, Hd, Mu, Md gap, F spring force.

Claims (5)

  1. 　流路が形成されるハウジングと、
    　前記流路を開閉する弁体を有し、前記ハウジングに回転可能に支持されるシャフトと、
    　前記シャフトの外周面に設けられる環状のシャフト側シール部材と、
    　前記ハウジングに設けられ、前記シャフト側シール部材と対向する環状のハウジング側シール部材と、
    　前記シャフト側シール部材の外周部に形成されるシャフト側段差部と、
    　前記ハウジング側シール部材の内周部に形成され、前記シャフト側段差部と接触するハウジング側段差部とを備え、
    　前記ハウジング側シール部材の軸心は、前記シャフトの軸心に対して前記流路の下流側に偏心される
    　ことを特徴とするバタフライバルブ。     a housing in which the flow path is formed;
    a shaft that has a valve body that opens and closes the flow path and is rotatably supported by the housing;
    an annular shaft-side seal member provided on the outer peripheral surface of the shaft;
    an annular housing-side seal member provided in the housing and facing the shaft-side seal member;
    a shaft-side stepped portion formed on the outer peripheral portion of the shaft-side seal member;
    a housing-side stepped portion formed on an inner peripheral portion of the housing-side seal member and in contact with the shaft-side stepped portion;
    A butterfly valve, wherein the axial center of the housing-side seal member is eccentric with respect to the axial center of the shaft downstream of the flow path.
  2. 　流路が形成されるハウジングと、
    　前記流路を開閉する弁体を有し、前記ハウジングに回転可能に支持されるシャフトと、
    　前記シャフトの外周面に設けられる環状のシャフト側シール部材と、
    　前記ハウジングに設けられ、前記シャフト側シール部材と対向する環状のハウジング側シール部材と、
    　前記シャフト側シール部材の外周部に形成されるシャフト側段差部と、
    　前記ハウジング側シール部材の内周部に形成され、前記シャフト側段差部と接触するハウジング側段差部とを備え、
    　前記シャフト側シール部材の軸心は、前記シャフトの軸心に対して前記流路の上流側に偏心される
    　ことを特徴とするバタフライバルブ。     a housing in which the flow path is formed;
    a shaft that has a valve body that opens and closes the flow path and is rotatably supported by the housing;
    an annular shaft-side seal member provided on the outer peripheral surface of the shaft;
    an annular housing-side seal member provided in the housing and facing the shaft-side seal member;
    a shaft-side stepped portion formed on the outer peripheral portion of the shaft-side seal member;
    a housing-side stepped portion formed on an inner peripheral portion of the housing-side seal member and in contact with the shaft-side stepped portion;
    A butterfly valve, wherein the axial center of the shaft-side seal member is eccentric with respect to the axial center of the shaft toward the upstream side of the flow path.
  3. 　前記シャフトを回転させるアクチュエータの駆動と連動し、前記シャフトの一端に固定されるプレートと、
    　前記ハウジングと前記プレートとの間に設けられ、前記プレートを前記シャフトの軸方向外側に向けて押圧するばねとを備える
    　ことを特徴とする請求項１又は請求項２記載のバタフライバルブ。     a plate fixed to one end of the shaft in conjunction with driving of an actuator that rotates the shaft;
    3. The butterfly valve according to claim 1, further comprising a spring provided between the housing and the plate for pressing the plate axially outward of the shaft.
  4. 　前記シャフト側段差部の角部、及び、前記ハウジング側段差部の角部は、Ｒ形状である
    　ことを特徴とする請求項１又は請求項２記載のバタフライバルブ。     3. The butterfly valve according to claim 1, wherein the corners of the shaft-side stepped portion and the corners of the housing-side stepped portion are rounded.
  5. 　前記シャフト側段差部の角部、及び、前記ハウジング側段差部の角部は、Ｃ面取り形状である
    　ことを特徴とする請求項１又は請求項２記載のバタフライバルブ。     3. The butterfly valve according to claim 1, wherein corners of said shaft-side stepped portion and corners of said housing-side stepped portion are chamfered.
PCT/JP2021/023705 2021-06-23 2021-06-23 Butterfly valve WO2022269785A1 (en)

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Application Number Priority Date Filing Date Title
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH044368A (en) * 1990-04-20 1992-01-08 Kubota Corp Valve shaft sealing device of butterfly valve
JPH09296867A (en) * 1996-04-30 1997-11-18 Tomoe Gijutsu Kenkyusho:Kk Shaft seal unit for butterfly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH044368A (en) * 1990-04-20 1992-01-08 Kubota Corp Valve shaft sealing device of butterfly valve
JPH09296867A (en) * 1996-04-30 1997-11-18 Tomoe Gijutsu Kenkyusho:Kk Shaft seal unit for butterfly

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