WO2023210415A1 - Soupape de commutation de trajet d'écoulement - Google Patents

Soupape de commutation de trajet d'écoulement Download PDF

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Publication number
WO2023210415A1
WO2023210415A1 PCT/JP2023/015238 JP2023015238W WO2023210415A1 WO 2023210415 A1 WO2023210415 A1 WO 2023210415A1 JP 2023015238 W JP2023015238 W JP 2023015238W WO 2023210415 A1 WO2023210415 A1 WO 2023210415A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve body
valve
seat member
flow path
path switching
Prior art date
Application number
PCT/JP2023/015238
Other languages
English (en)
Japanese (ja)
Inventor
大介 近藤
Original Assignee
株式会社不二工機
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 株式会社不二工機 filed Critical 株式会社不二工機
Publication of WO2023210415A1 publication Critical patent/WO2023210415A1/fr

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Classifications

    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor

Definitions

  • the present disclosure relates to a flow path switching valve, and more particularly, to a flow path switching valve that switches a flow path by rotating and sliding a ball-shaped valve body within a valve chamber.
  • Japanese Unexamined Patent Publication No. 2018-115691 discloses a type of flow path switching valve that switches the flow path by rotating a ball-shaped valve body.
  • valve body is rotationally driven using a rotational drive unit consisting of a motor, a drive gear, etc.
  • a pair of annular sheet members are arranged in a valve chamber having a pair of outlet ports facing each other, corresponding to each outlet port.
  • a ball-shaped valve body is rotatably and slidably arranged between the pair of seat members.
  • An annular groove is formed on the side surface of the seat member opposite to the valve body side, and an O-ring made of an elastic material such as rubber is placed in the annular groove in a compressed state.
  • the side surface of the seat member opposite to the valve body side is spaced apart from the wall surface of the valve chamber, and the outer circumferential surface of the seat member is in close contact with the inner circumferential surface of the valve chamber.
  • the seat member disposed within the valve chamber is pressed against the outer circumferential surface of the valve body by the elastic force (repulsive force) of the O-ring. This provides an airtight seal between the valve body and each outlet.
  • valve body is sandwiched between a pair of annular seat members, and the pair of seat members are pressed against the valve body by the elastic force of the O-ring, so rotational force (torque) is required to rotate the valve body. ) is required.
  • the maximum compression ratio is calculated from the minimum compression ratio of the O-ring, taking into account dimensional tolerances of each part, temperature effects, aging deterioration, etc.
  • the torque that rotates the valve body when the O-ring reaches its maximum compression ratio is the maximum torque. For this reason, the specifications of the rotary drive section are determined so that a torque higher than the above-mentioned maximum torque can be produced.
  • the seat member when the seat member becomes hot, the seat member expands in the axial direction, and the seat member is strongly pressed against the valve body, and the valve body is strongly tightened between the pair of seat members, driving the valve body to rotate. It becomes difficult to do.
  • the seat member when the temperature of the seat member decreases, the seat member may shrink, creating a clearance between the seat member and the valve body and between the side surface of the seat member and the wall of the valve chamber. .
  • the outer circumferential surface of the seat member is brought into contact with the inner circumferential surface of the valve chamber, and a gap is provided between the side surface of the seat member on the opposite side of the valve body and the wall surface of the valve chamber opposite to this wall surface.
  • an O-ring which is an elastic body
  • the present disclosure aims to provide a flow path switching valve that minimizes the number of dimensional control points and allows the valve body to be rotated with small torque.
  • the inventors conducted various studies and experiments on flow switching valves equipped with ball-shaped valve discs, and found that the relationship between the members and the angle of the inclined sealing surface of the seat member with which the outer peripheral surface of the valve disc contacts It has been found that when ⁇ is set to a certain value, it becomes easier to manage the dimensions of the members for reducing the torque for rotating the valve body, and the torque for rotating the valve body is less affected by temperature.
  • the flow path switching valve has a valve chamber formed therein, and at least a pair of mutually opposing wall surfaces of the valve chamber.
  • valve body that is disposed between the valve body and the inlet/outlet, a side surface opposite to the valve body side is in contact with the wall surface, and an outer peripheral surface is spaced apart from the valve body;
  • the valve body is formed at the opening end of the seat member on the valve body side, is inclined at a certain angle ⁇ with respect to the axis when viewed in a cross section along the axis of the seat member, and is in contact with the outer peripheral surface of the valve body.
  • a rotation drive unit that rotates the valve body so as to selectively switch through the flow path, and the pressing force between the valve body and the seat member at the lowest temperature in the use condition and the highest in the use condition. The value of the angle ⁇ is determined so that the pressing force between the valve body and the seat member at the temperature does not change.
  • valve body can be rotated using the rotational force (torque) of the rotational drive section.
  • valve body In this flow path switching valve, a valve body, a pair of seat members, and a pair of elastic bodies are arranged in series inside the valve chamber.
  • the seat member has an inclined sealing surface in contact with the valve body, and a side opposite to the valve body side in contact with a wall surface of the valve chamber.
  • the elastic body that presses the seat member against the valve body is in a compressed state within a recess provided in either the side surface of the seat member on the valve body side or the wall surface of the valve body. Therefore, in order to determine the elastic force of the elastic body that presses the seat member against the valve body, the compression ratio of the elastic body can be determined by managing two dimensions: the depth of the recess and the size of the elastic body.
  • the thickness direction (axial direction) dimension of the seat member are related to the pressing force of the seat member against the valve body, so the angle of the inclined seal surface that contacts the valve body
  • the angle ⁇ of the inclined seal surface is set so that the force pressing against the valve body due to the expansion of the seat member does not change even if the temperature changes, so when rotating the valve body, The required torque becomes less sensitive to temperature.
  • an annular recess in which the sheet member is disposed is provided in the wall surface of the valve body, and a side portion of the sheet member is located at a bottom of the annular recess.
  • the holding groove is provided at the bottom of the annular recess, and the elastic body is fitted into the holding groove.
  • a third aspect of the flow path switching valve according to the first aspect or the second aspect is characterized in that the angle ⁇ is 57.9 ⁇ 5.79°.
  • FIG. 1 is a perspective view showing a flow path switching valve according to an embodiment of the present disclosure.
  • 2 is a sectional view taken along line 2-2 of the flow path switching valve shown in FIG. 1.
  • FIG. 3 is an enlarged sectional view showing the main parts of the flow path switching valve. It is a sectional view of the valve body showing a flow path of the valve body.
  • FIGS. 1 to 4 A flow path switching valve 10 according to one embodiment of the present disclosure will be described using FIGS. 1 to 4.
  • gaps formed between members, separation distances between members, etc. may be exaggerated in order to facilitate understanding of the invention and for convenience in drawing. be.
  • descriptions expressing positions and directions such as up and down, left and right, front and rear, etc. are based on the direction arrows shown in FIGS. 1 and 2, and do not refer to positions and directions in actual use. .
  • FIG. 1 is a perspective view showing the overall configuration of a flow path switching valve 10 according to an embodiment of the present disclosure
  • FIG. 2 is a longitudinal cross-sectional view (line 2-2) of the flow path switching valve 10 shown in FIG. sectional view).
  • the flow path switching valve 10 of the embodiment shown in FIG. 1 is used as a rotary three-way valve that switches the flow path of fluid flowing in, for example, the engine room of an automobile in multiple directions.
  • the flow path switching valve 10 shown in FIG. 2 a valve body 14 having a valve chamber 12, a ball-shaped valve body (also referred to as a ball valve body) 16 rotatably disposed within the valve chamber 12, and a rotation axis
  • the valve body 14 is provided with a rotation drive unit 18 consisting of a motor, a drive gear, etc. arranged from the rear to the top of the valve body 14.
  • a rotational axis O1 an axis extending in the vertical direction
  • of the valve body 16 housed in the valve chamber 12 is coaxial with a centerline of a valve shaft 18A of the rotation drive unit 18, which will be described later.
  • valve body valve chamber
  • the valve body 14 includes, for example, a base member 20 and a port member 44, each of which is made of synthetic resin.
  • the base member 20 has a horizontally cylindrical valve chamber 12 formed therein.
  • An annular recess 46 in which a seat member 38 to be described later is disposed is formed in the first right wall surface 12R of the valve chamber 12 on the right side of the arrow (right side in the drawing).
  • a horizontal outlet (inlet/outlet) 26 that opens into the valve chamber 12 is formed at the center of the bottom of the annular recess 46 .
  • An O-ring groove 48 (retaining groove) is formed on the radially outer side of the outlet 26.
  • An O-ring 50 is fitted into the O-ring groove 48 and serves as both an elastic body and a sealing member.
  • an L-shaped port 26A made of a pipe joint is integrally provided on the outer surface of the base member 20 on the right side of the arrow so as to communicate with the outlet 26. There is.
  • valve chamber 12 As shown in FIG. 2, the valve chamber 12 is open on the left side of the arrow (left side in the drawing), and an L-shaped port connected to the valve chamber 12 is provided at the end of the valve body 14 on the left side of the arrow. A member 44 is fixed.
  • the port member 44 includes an L-shaped port 52 as a pipe joint.
  • An annular flange 54 that contacts the end surface of the valve body 14 and a cylindrical insertion portion 56 that is inserted into the valve chamber 12 are formed on the valve chamber 12 side of the port 52 .
  • a horizontal outlet (inlet/outlet) 24 that opens into the valve chamber 12 is provided at the end of the insertion portion 56 on the valve chamber 12 side.
  • the insertion portion 56 of the port member 44 is inserted into the valve chamber 12.
  • the flange 54 of the port member 44 is welded and fixed to the valve body 14 while being in contact with the end face of the valve body 14 .
  • annular recess 58 is formed at the distal end of the insertion portion 56, in which a sheet member 38, which will be described later, is placed.
  • An O-ring groove 60 (retaining groove) similar to the O-ring groove 48 is formed at the bottom of the annular recess 58 .
  • An O-ring 50 is fitted into the O-ring groove 60 in the same manner as the O-ring groove 48.
  • valve body 14 is provided with a lateral inlet (inlet/outlet; not shown) that opens into the valve chamber 12 on the wall surface of the valve chamber 12 on the forward side of the drawing arrow.
  • a port 28A made of a pipe joint is integrally provided on the outer surface of the valve body 14 so as to communicate with this inlet (inlet/outlet).
  • an insertion hole 30 is provided in the upper part of the valve body 14, into which the valve shaft 18A of the rotational drive section 18 is rotatably inserted.
  • An O-ring groove 32 is formed on the outer periphery of the axially intermediate portion of the valve shaft 18A, and an O-ring 34 as a sealing member is fitted into the O-ring groove 32.
  • the valve shaft 18A of the rotation drive unit 18 is connected to the valve body 16, so that the valve shaft 18A and the valve body 16 rotate together.
  • valve body The valve body 16 is made of, for example, synthetic resin.
  • a flow path (internal flow path) 36 is provided inside the valve body 16, as shown in FIG.
  • the valve body 16 is formed with a through hole 36A that penetrates in a first direction orthogonal to the direction of the rotation axis O1 of the valve body 16. Further, the valve body 16 has a horizontal hole 36B that merges from the outer periphery (side part) of the valve body 16 to the center of the through hole 36A, and extends in a direction perpendicular to the rotation axis O1 of the valve body 16 and perpendicular to the through hole 36A. It is formed.
  • sheet member 38 As shown in FIG. 3, an annular sheet member 38 is disposed in each of the annular recess 46 and the annular recess 58 formed around each of the outlet ports 24 and 26 in the valve body 1.
  • the sheet member 38 is made of synthetic resin and has openings corresponding to the respective outlets 24 and 26.
  • valve body 14 in the valve chamber 12 of the valve body 14, a pair of seat members 38, 38 are distributed.
  • the valve body 16 is rotatably and slidably arranged between the pair of seat members 38, 38 (on the inside).
  • the open end of the seat member 38 on the valve body 16 side is inclined at a constant angle ⁇ ° with respect to the axis O2 when viewed in cross section along the axis O2 of the seat member 38, and has an outer circumferential surface of the valve body 16.
  • An inclined sealing surface 38A is formed in which the two members contact each other in an annular and linear manner.
  • the inclined sealing surface 38A is constituted by a part of a concave conical surface.
  • the sheet member 38 on the right side of the arrow has a planar base end surface 38b, which is a side surface opposite to the inclined seal surface 38A, which is located in the annular recess 46 provided in the valve chamber 12.
  • the O-ring 50 is compressed by a predetermined amount by constantly contacting the bottom portion 46a.
  • the outer diameter of the sheet member 38 on the right side of the arrow (right side in the drawing) is slightly smaller than the inner diameter of the annular recess 46, and there is a gap between the outer peripheral surface of the sheet member 38 and the inner peripheral surface of the annular recess 46. A gap is provided.
  • the sheet member 38 on the left side of the arrow has a planar base end surface 38b, which is the side surface opposite to the inclined seal surface 38A, in the annular shape provided in the insertion portion 56 of the port member 44.
  • the O-ring 50 is compressed by a predetermined amount by constantly contacting the bottom 58a of the recess 58.
  • the outer diameter of the sheet member 38 on the left side of the arrow (left side in the drawing) is slightly smaller than the inner diameter of the annular recess 58, and there is a gap between the outer peripheral surface of the sheet member 38 and the inner peripheral surface of the annular recess 58. A gap is provided.
  • the elastic force (repulsive force) of the O-ring 50 compressed by a predetermined amount presses the inclined sealing surface 38A of each seat member 38 so as to come into close contact with the valve body 16 (the outer peripheral sealing surface of the valve body 16).
  • the space between the outlet ports 24 and 26 is airtightly sealed.
  • the groove depth of the O-ring groove 48 is adjusted so that a predetermined elastic force of the O-ring 50 (a force that causes the compressed O-ring 50 to return to its original shape) acts on the valve body 16 via the seat member 38.
  • the groove depth of the O-ring groove 60 and the wire diameter of the O-ring 50 are determined.
  • the diameter of the opening side of the inclined sealing surface 38A is set to a (mm).
  • the thickness dimension from the surface of the seat member 38 in contact with the O-ring 50 (the bottom surface of the O-ring groove 40) to the side surface of the seat member 38 on the valve body side is defined as b (mm).
  • the diameter of the valve body 16 is d (mm).
  • the distance between the bottom of the annular recess 58 on the left side of the drawing arrow (left side in the drawing) and the bottom of the annular recess 46 on the right side of the drawing arrow (right side in the drawing) of the valve chamber 12, which face each other, is set to e (mm). .
  • the pressing force between the valve body 16 and the seat member 38 at the lowest temperature in the use state, and the pressure force between the valve body 16 and the seat member 38 at the highest temperature in the use state is determined so that the pressing force between 38 and 38 does not change.
  • the valve body 16 and the seat at the lowest temperature in use are The angle ⁇ is determined so that the pressing force between the valve body 16 and the seat member 38 is the same as the pressing force between the valve body 16 and the seat member 38 at the highest temperature in use.
  • the seat member 38 and the O-ring 50 are made of a material that has a relatively larger coefficient of linear expansion than the valve body 14 and the valve body 16.
  • the valve body 14 and the valve body 16 may be made of PPS (polyphenylene sulfide), the seat member 38 may be made of PTFE (fluororesin), and the O-ring 50 may be made of synthetic rubber.
  • the insertion portion 56 of the port member 44 is inserted into the valve chamber 12.
  • the flange 54 of the port member 44 is welded and fixed to the valve body 14 while being in contact with the end face of the valve body 14 .
  • the port member 44 with the O-ring 50 attached is inserted.
  • the insertion portion 56 is inserted into the valve chamber 12 with a predetermined force so as to compress the O-ring 50, and the flange 54 of the port member 44 is welded to the side surface of the valve body 14.
  • valve body 16 In the flow path switching valve 10 of this embodiment, the valve body 16, two seat members 38, and two O-rings 50 are arranged in series inside the valve chamber 12. The ring 50 and the O-ring 50 within the O-ring groove 60 are sealed in compression within the O-ring groove.
  • the base end surface 38b (valve body) on the opposite side to the inclined seal surface 38A is always in contact with the bottom 46a of the annular recess 46.
  • the base end surface 38b (the surface opposite to the valve body) opposite to the inclined seal surface 38A is always in contact with the bottom 58a of the annular recess 58.
  • the groove depth of the O-ring groove 48 and the base end of the sheet member 38 from the groove depth of the O-ring groove 48 are The distance to the surface 38b is the same.
  • the base end surface 38b of the seat member 38 is in contact with the bottom 58a of the annular recess 58, the groove depth of the O-ring groove 48 and the base end of the seat member 38 from the groove depth of the O-ring groove 60 are The distance to the portion 38b is the same.
  • the groove depth of the O-ring groove 48 and the O-ring groove 60 and the wire diameter of the O-ring 50 are determined.
  • the compression ratio of the O-ring groove 60 can be determined by managing the two dimensions, which makes it easy to manage the dimensions of the member.
  • the outer circumferential surface 38c of the seat member 38 (the outer circumferential surface in the circumferential direction of the axis O2 of the seat member 38) is spaced apart so as not to come into contact with the annular recess 46 (58). Therefore, the seat member 38 is not subjected to pressure from the valve body 14 or the port member 44 from the circumferential direction of the axis O2, making it easy to manage the dimensions of the member, as well as deforming the seat member 38 and changing the angle of the inclined sealing surface 38A. can be suppressed.
  • the seat member 38 is urged toward the valve body 16 by the compressed O-ring 50, and the inclined sealing surface 38A of the seat member 38 is in contact with the outer periphery of the valve body 16.
  • the seat member 38 When the temperature rises, the diameter of the seat member 38 increases, the inclined sealing surface 38A moves away from the valve body 14 in the radial direction of the seat member 38, and the pressing force that presses the valve body 16 decreases.
  • the angle ⁇ of the inclined sealing surface 38A is set to an appropriate angle, even if a temperature change occurs (in other words, even if the seat member 38 changes dimensions due to a temperature change), the valve body 16 due to the expansion of the seat member 38 will It is possible to prevent the pressing force from changing.
  • the values of a, b, d, and e described above are determined by considering the linear expansion coefficient of each component, and the valve body 16 and the seat member at the lowest temperature in use are determined by temperature changes. 38 and the pressing force between the valve body 16 and the seat member 38 at the highest temperature in use are the same, that is, the pressure between the valve body 16 and the seat member 38 due to temperature change.
  • the angle ⁇ of the inclined seal surface 38A at which the pressing force remains unchanged was determined.
  • the angle ⁇ can also be determined by simulation, experiment, or the like.
  • the seat member 38 is substantially pressed against the valve body 16 only by the elastic force of the O-ring 50, both at the lowest temperature and at the highest temperature during use. It is possible to realize a flow path switching valve 10 in which the torque required for rotational driving is less affected by temperature, and the valve body 16 can be rotated with a small torque.
  • the flow path switching valve 10 of this embodiment uses a rotary drive unit 18 with a large rotational force so that the rotational force required to drive the valve body 16 is suppressed from increasing as the temperature rises. This eliminates the need for such a valve, and it becomes possible to use a small valve with low rotational force, and it is also possible to downsize the flow path switching valve 10.
  • the O-ring 50 was attached to the O-ring groove 48 formed in the first right wall surface 12R and the O-ring groove 60 formed in the port member 44, and the seat member 38 was pressed against the valve body 16.
  • the present disclosure is not limited to this, and may have a configuration in which an O-ring groove is formed in the sheet member 38 and the O-ring 50 is attached to the O-ring groove formed in the sheet member 38.
  • valve body 14 can be changed as appropriate depending on the application location of the flow path switching valve 10.
  • a three-way valve is used as an example of the flow path switching valve 10, but it goes without saying that a two-way valve or a four-way or more switching valve may also be used.
  • the flow path switching valve 10 of the above embodiment is assumed to be used for flow path switching in the engine compartment of a vehicle (engine cooling circuit, electronic device cooling circuit, etc.);
  • the present invention is not limited to this, and may be used, for example, for switching channels in hot water supply equipment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multiple-Way Valves (AREA)
  • Sliding Valves (AREA)
  • Taps Or Cocks (AREA)

Abstract

L'invention concerne une soupape de commutation de trajet d'écoulement comprenant : un corps de soupape dans lequel une chambre de soupape est ménagée ; un élément de soupape disposé dans la chambre de soupape ; un élément feuille annulaire qui est positionné entre l'élément de soupape et l'entrée/sortie du corps de soupape de telle sorte qu'une surface latérale sur le côté inverse par rapport au côté de l'élément de soupape entre en contact avec une surface de paroi du corps de soupape, et la surface périphérique externe est séparée du corps de soupape ; une surface d'étanchéité inclinée qui est formée sur l'élément feuille, est inclinée selon un angle fixe θ par rapport à un axe, et vient au contact de la surface périphérique externe de l'élément de soupape ; un joint torique qui est comprimé et logé dans une rainure de joint torique ménagée dans la surface de paroi du corps de soupape ; et une unité d'entraînement en rotation qui fait tourner l'élément de soupape, la valeur de l'angle θ étant déterminée de telle sorte que la force de pression entre l'élément de soupape et l'élément feuille à la température minimale pendant l'utilisation et la force de pression entre le corps de soupape et l'élément feuille à la température maximale pendant l'utilisation ne varient pas.
PCT/JP2023/015238 2022-04-28 2023-04-14 Soupape de commutation de trajet d'écoulement WO2023210415A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-075459 2022-04-28
JP2022075459A JP2023164115A (ja) 2022-04-28 2022-04-28 流路切換弁

Publications (1)

Publication Number Publication Date
WO2023210415A1 true WO2023210415A1 (fr) 2023-11-02

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PCT/JP2023/015238 WO2023210415A1 (fr) 2022-04-28 2023-04-14 Soupape de commutation de trajet d'écoulement

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WO (1) WO2023210415A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5217215A (en) * 1975-07-30 1977-02-09 Tlv Co Ltd Ball valve
JPH0671975U (ja) * 1993-03-23 1994-10-07 株式会社日阪製作所 ボール弁の弁座
JPH08247306A (ja) * 1995-03-15 1996-09-27 Iwamura Kk 弁 座
US6217002B1 (en) * 1998-01-13 2001-04-17 Terry C. Shafer Valve assembly having floating retainer rings
JP2019011867A (ja) * 2018-10-24 2019-01-24 株式会社キッツ トラニオン型ボールバルブ
JP2020063787A (ja) * 2018-10-17 2020-04-23 東フロコーポレーション株式会社 ボールバルブ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5217215A (en) * 1975-07-30 1977-02-09 Tlv Co Ltd Ball valve
JPH0671975U (ja) * 1993-03-23 1994-10-07 株式会社日阪製作所 ボール弁の弁座
JPH08247306A (ja) * 1995-03-15 1996-09-27 Iwamura Kk 弁 座
US6217002B1 (en) * 1998-01-13 2001-04-17 Terry C. Shafer Valve assembly having floating retainer rings
JP2020063787A (ja) * 2018-10-17 2020-04-23 東フロコーポレーション株式会社 ボールバルブ
JP2019011867A (ja) * 2018-10-24 2019-01-24 株式会社キッツ トラニオン型ボールバルブ

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