WO2019235159A1 - Flow passage switching valve - Google Patents

Flow passage switching valve Download PDF

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Publication number
WO2019235159A1
WO2019235159A1 PCT/JP2019/019477 JP2019019477W WO2019235159A1 WO 2019235159 A1 WO2019235159 A1 WO 2019235159A1 JP 2019019477 W JP2019019477 W JP 2019019477W WO 2019235159 A1 WO2019235159 A1 WO 2019235159A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve body
seat surface
shaft
flow path
Prior art date
Application number
PCT/JP2019/019477
Other languages
French (fr)
Japanese (ja)
Inventor
原　聖一
望月　健一
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
Priority to CN201980025970.8A priority Critical patent/CN112189108B/en
Publication of WO2019235159A1 publication Critical patent/WO2019235159A1/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
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/072—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members
    • F16K11/074—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members with flat sealing faces
    • 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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/04—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members
    • F16K3/10—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members with special arrangements for separating the sealing faces or for pressing them together

Definitions

  • the present invention relates to a flow path switching valve.
  • the three-way valve 100 includes a valve shaft 130, a motor 105 for rotationally driving the valve shaft 130, and a valve main body 110 to which the motor 105 is attached.
  • the valve main body 110 is provided with an inlet 120, a first outlet 121, and a second outlet 122. Further, the valve main body 110 has a valve shaft fitting insertion portion 112 into which the valve shaft 130 is fitted in a watertight manner so as to be rotatable through the O-rings 135 and 135 and movable in the axial direction, and a valve shaft fitting insertion portion 112.
  • a valve seat 115 is provided on the outer periphery of the lower part of the valve body. The entire lower surface of the valve seat 115 is a smooth surface.
  • a valve body 140 is attached to a lower end portion of the valve shaft 130 protruding downward from the valve body receiving seat 115 so as to be rotatable integrally with the valve shaft 130.
  • the valve body 140 has a double cylindrical structure, and a vertical through passage 151 penetrating in the vertical direction and a groove-like passage 152 having an open upper surface are provided between the inner cylinder portion 141 and the outer cylinder portion 142.
  • valve shaft 130 is pulled upward together with the valve body 140 due to the pressure difference between the fluid (hot water) pressure in the valve body 110 and the atmospheric pressure, and the upper surface of the valve body 140 is pressed against the lower surface of the valve body receiving seat 115. It is done. As a result, the space between the longitudinal through passage 151 and the groove-like passage 152 is sealed in a watertight manner.
  • the fluid that has flowed from the inlet 120 flows out from the first outlet 121 through the longitudinal through passage 151.
  • the flow of the fluid at this time is schematically shown by a solid line arrow.
  • the valve body 140 in a state where the valve body 140 is at another rotational position rotated by a predetermined angle from the rotational position shown in FIG. It flows out from the outlet 122.
  • the flow of the fluid at this time is schematically indicated by a dashed arrow.
  • the above-described three-way valve 100 seals a space between the valve body 140 by pressing the upper surface of the valve body 140 against the lower surface of the valve body receiving seat 115 due to the differential pressure between the fluid pressure in the valve body 110 and the atmospheric pressure. Therefore, when the fluid pressure or atmospheric pressure fluctuates, there is a possibility that stable sealing performance cannot be ensured. Further, in the configuration in which the resin valve body 110 and the valve body 140 are employed in the three-way valve 100, high surface accuracy is obtained for a relatively wide portion such as the upper surface of the valve body 140 and the lower surface of the valve body receiving seat 115. It is difficult to secure the sealing property.
  • valve element 140 faces downward. A force is applied, and the valve shaft 130 and the valve body 140 move downward. As a result, a gap is created between the upper surface of the valve body 140 and the lower surface of the valve body receiving seat 115, and fluid pressure can be released to the inlet 120 and the first outlet 121. Thereafter, when the fluid pressure at the second outlet 122 decreases and returns to the normal pressure, an upward force is applied to the valve shaft 130 and the valve body 140 due to the differential pressure between the fluid pressure in the valve body 110 and the atmospheric pressure, and the valve The shaft and valve body 140 move upward.
  • valve shaft 130 and the valve body 140 cannot return to their original positions due to the sliding resistance of the O-rings 135, 135, and the gap between the upper surface of the valve body 140 and the lower surface of the valve body seat 115 There is a possibility that the sealing performance cannot be secured.
  • an object of the present invention is to provide a flow path switching valve capable of effectively ensuring the sealing performance between the valve body and the valve seat surface.
  • a flow path switching valve is disposed rotatably on a valve body provided with a valve chamber and a valve seat surface in the valve chamber, and according to the rotational position. And a valve body that opens and closes a port provided on the valve seat surface, a drive unit that includes a drive mechanism that rotates the valve body, and a valve shaft that connects the valve body and the drive mechanism.
  • a switching valve wherein the valve shaft is disposed perpendicular to the valve seat surface, the valve body is attached to one end of the valve shaft so as to be movable in the axial direction, and the valve body and the valve An elastic member compressed in the axial direction is provided between the valve shaft and the valve shaft.
  • the valve body is attached to one end portion of the valve shaft disposed orthogonal to the valve seat surface so as to be movable in the axial direction, and between the valve body and the valve shaft in the axial direction.
  • a compressed elastic member is provided. Since it did in this way, since a valve body is pressed on a valve seat surface with the restoring force of an elastic member, the sealing performance between a valve body and a valve seat surface can be ensured stably. Even when the valve body is separated from the valve seat surface by fluid pressure, it can be reliably restored to its original state by the restoring force of the elastic member, and the sealing performance between the valve body and the valve seat surface is ensured. Can be secured.
  • the elastic member is disposed in a housing space in the valve body and the valve shaft.
  • the elastic member is surrounded by the valve body and the valve shaft and is not exposed to the outside, the influence of the fluid on the elastic member can be reduced and the valve body can be stably pressed against the valve seat surface. it can. Moreover, it can suppress that an elastic member contacts another member by the influence of a fluid.
  • the valve body or the valve shaft is provided with a pressure equalizing hole that communicates the housing space with the outside.
  • one of the valve body and the valve body is provided with a positioning boss coaxial with the rotating shaft of the valve body, and the other is provided with a positioning hole into which the positioning boss is rotatably inserted. It is preferable. By doing in this way, a valve body can be arrange
  • valve seat surface protrudes from an inner wall surface of the valve body. By doing so, the area of the valve seat surface that contacts the valve body can be reduced, and the force (pressure) that presses the valve body per unit area against the valve seat surface can be increased to improve the sealing performance more effectively. Can be secured.
  • the valve seat surface includes a plurality of the ports, a plurality of annular portions surrounding each of the plurality of ports, and a connecting portion that connects the annular portions, and the connecting portion includes the plurality of the plurality of ports.
  • the valve seat surface includes a plurality of the ports, a plurality of annular portions surrounding each of the plurality of ports, and a connecting portion that connects the annular portions, and the connecting portion includes the plurality of the plurality of ports.
  • a circular member disposed along a virtual ellipse passing through the center of the annular portion, the valve body being in contact with the valve seat surface, and a valve body main body portion rotatably holding the circular member in the circumferential direction; It is preferable to have. By doing so, the circular member rotates (revolves) along with the rotation (revolution) of the valve body, or the sliding portion with the annular portion of the circular member can be dispersed. Uneven wear of the body can be reduced.
  • FIG. 6 is another cross-sectional view in which the rotational position of the valve body in the flow path switching valve in FIG. 1 is different. It is the expanded sectional view which looked at sectional drawing of FIG. 2 from the diagonal direction.
  • It is a disassembled perspective view of the flow-path switching valve of FIG.
  • It is a perspective view of the valve main body of the flow-path switching valve of FIG.
  • It is a top view of the valve seat surface of the valve main body of FIG.
  • It is a perspective view of the valve body and valve stem of the flow-path switching valve of FIG.
  • It is sectional drawing which shows the conventional flow-path switching valve.
  • FIG. 1 and 2 are sectional views (longitudinal sectional views) taken along the rotation axis of the valve body of the flow path switching valve according to one embodiment of the present invention.
  • FIG. 1 shows a state in which the valve body is in the first rotational position
  • FIG. 2 shows a state in which the valve body is in the second rotational position rotated 180 degrees from the first rotational position.
  • the flow of the fluid is schematically shown by arrows.
  • FIG. 3 is an enlarged cross-sectional view of the flow path switching valve of FIG. 2 as viewed from an oblique direction.
  • FIG. 4 is an exploded perspective view of the flow path switching valve of FIG.
  • FIG. 5 is a perspective view of the valve body of the flow path switching valve of FIG. FIG.
  • FIG. 6 is a plan view of the valve seat surface of the valve main body of FIG. 5 and a modification thereof.
  • FIG. 6A shows a configuration in which the connecting portion of the valve seat surface is displaced from the inside of the virtual perfect circle
  • FIG. 6B shows the configuration in which the connecting portion of the valve seat surface is arranged along the virtual ellipse.
  • the structure of the modified example is shown.
  • FIG. 7 is a perspective view of the valve body and the valve shaft of the flow path switching valve of FIG. 1.
  • “up, down, left and right” is used in each drawing to indicate the relative positional relationship between the members, and does not indicate an absolute positional relationship.
  • the flow path switching valve 1 of the present embodiment includes a valve body 10, a lid body 20, a valve body 30, a drive unit 40, a valve shaft 50, an elastic member 60, and the like. ,have.
  • the valve body 10 is made of a synthetic resin as a material and is formed in a substantially bottomed cylindrical shape having an open top.
  • An inlet channel 11 extending in one direction (the left direction in FIGS. 1 and 2) is provided in the peripheral wall portion 10a of the valve body 10.
  • the bottom wall portion 10b of the valve body 10 is provided with a first outlet channel 12 that extends downward and extends in the other direction opposite to the inlet channel 11 (the right direction in FIGS. 1 and 2).
  • a second outlet channel 13 extending downward is provided in the bottom wall portion 10 b of the valve body 10.
  • the inlet channel 11, the first outlet channel 12, and the second outlet channel 13 communicate with a valve chamber 14 provided in the valve body 10. Two or four or more flow paths leading to the valve chamber 14 may be provided.
  • a valve seat surface 15 is provided on the inner wall surface 10 c of the bottom wall portion 10 b of the valve body 10.
  • the valve seat surface 15 is a smooth surface protruding about 0.1 mm to 5.0 mm above the inner wall surface 10c of the bottom wall portion 10b.
  • the valve seat surface 15 is provided with a first port 16 that communicates with the first outlet channel 12 and a second port 17 that communicates with the second outlet channel 13.
  • a plurality of ports communicating with the outlet channel are provided according to the number of outlet channels.
  • the valve seat surface 15 includes two circular annular portions 15a and 15a surrounding the first port 16 and the second port 17, and two coupling portions 15b and 15b that connect the annular portions 15a and 15a to each other. Yes.
  • the annular portions 15a and 15a and the connecting portions 15b and 15b are continuous with each other.
  • the centers O and O of the first port 16 and the second port 17 are opposed to each other in the radial direction across the center (axis L) on the virtual perfect circle VC.
  • the virtual perfect circle VC passes through the centers O and O of the first port 16 and the second port 17.
  • the connection parts 15b and 15b are shifted
  • the centers O, O of the first port 16 and the second port 17 are arranged in a radial direction (major axis, long axis, sandwiching the center (axis L) on the virtual ellipse VO.
  • the connecting portions 15b and 15b may be disposed along the virtual ellipse VO.
  • the virtual ellipse VO passes through the centers O and O of the first port 16 and the second port 17.
  • the connecting portions 15b and 15b may be disposed outside the virtual perfect circle VC, or may be disposed along the virtual perfect circle VC.
  • the valve body 10 is obtained by injection molding in which a resin material is injected into a mold. Since the valve seat surface 15 protrudes from the inner wall surface 10c, the valve seat surface 15 is molded with a frame incorporated in the mold body, so that only the frame requires high surface accuracy, and the inner wall surface 10c, etc. High surface accuracy can be dispensed with for a mold body or the like that molds this part. As a result, the surface accuracy of the valve seat surface 15 having a smaller area than that when the entire inner wall surface 10c is used as the valve seat surface can be increased at low cost, and the sealing performance can be effectively ensured.
  • a cylindrical positioning boss 18 is erected on the valve seat surface 15 at an intermediate position between the first port 16 and the second port 17.
  • the lid 20 is formed in a substantially cylindrical shape using a synthetic resin as a material.
  • the lid 20 is fixedly attached to the valve body 10 so as to close the upper opening of the valve body 10, and defines the valve chamber 14 together with the valve body 10.
  • a bearing portion 21 that rotatably supports a later-described valve shaft 50 is provided.
  • the valve body 30 is accommodated in the valve chamber 14 and is rotatably disposed on the valve seat surface 15.
  • the valve body 30 opens and closes the first port 16 and the second port 17 provided on the valve seat surface 15 according to the first rotation position shown in FIG. 1 and the second rotation position shown in FIG.
  • the valve body 30 includes an annular member 31 and a disk member 32 as a circular member, and a valve body main body 33.
  • the annular member 31 and the disk member 32 are members formed into a ring shape and a disk shape by cutting a synthetic resin such as polytetrafluoroethylene (PTFE) or polyacetal (POM), for example.
  • PTFE polytetrafluoroethylene
  • POM polyacetal
  • the annular member 31 and the disc member 32 are in contact with the valve seat surface 15 and overlap the annular portions 15a and 15a of the valve seat surface 15 at the first rotational position and the second rotational position.
  • the central locus of the annular member 31 and the disk member 32 coincides with the virtual perfect circle VC when viewed from the direction of the rotation axis.
  • the valve body main body 33 integrally includes a valve portion 34 and a shaft portion 35.
  • the valve part 34 is formed in a substantially rectangular plate shape. On the lower surface 34a on the valve seat surface 15 side of the valve portion 34, annular ribs 34b and 34b having inner diameters that are the same as or slightly larger than the outer diameters of the annular member 31 and the disk member 32 are provided.
  • the valve part 34 rotates the ring member 31 and the disk member 32 in the circumferential direction between the valve seat surface 15 by arranging the ring member 31 and the disk member 32 inside the ribs 34b and 34b. Hold as possible. Further, a through hole 34 c is provided at a location corresponding to the inner edge of the annular member 31 in the valve portion 34.
  • the disc member 32 may be replaced with the annular member 31, and the annular member 31 and the disc member 32 are omitted, and the annular ribs 34b and 34b are provided at the first rotational position and the second rotational position.
  • the valve body 30 may be configured to overlap the annular portions 15a and 15a of the valve seat surface 15.
  • the annular member 31 and the disk member 32 may be formed integrally with the valve body 30.
  • the shaft portion 35 is formed in a hexagonal column shape, and is erected perpendicularly to the center of the upper surface 34d on the valve portion 34 opposite to the valve seat surface 15 side. Further, the valve body main body 33 is formed with a positioning hole 38 into which the positioning boss 18 is rotatably inserted so as to open at the center of the lower surface 34 a of the valve portion 34.
  • the positioning boss 18 may be provided in the valve body main body 33 and the positioning hole 38 may be provided in the valve main body 10.
  • the drive unit 40 includes a drive mechanism that combines a motor and a speed reducer (not shown), and a resin drive unit case 41 that houses the drive mechanism.
  • the drive unit case 41 is formed in a substantially rectangular parallelepiped box shape.
  • the drive unit case 41 is fixedly attached to the upper portion of the lid body 20.
  • the valve shaft 50 is formed in a cylindrical shape as a whole, and is arranged so as to be orthogonal to the valve seat surface 15.
  • the valve shaft 50 includes a D-cut portion 51, a serration portion 52, a supported portion 53, and a valve body attaching portion 54 in order from the upper end.
  • the D-cut portion 51 has a flat portion formed on a part of the outer peripheral surface of the cylinder, and is used for positioning the valve shaft 50 in the circumferential direction.
  • the serration unit 52 is formed in a gear shape (serration) to which the rotational driving force of the drive mechanism of the drive unit 40 is applied.
  • the supported portion 53 is formed in a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the bearing portion 21. On the outer peripheral surface of the supported portion 53, groove portions 53a and 53a in which O-rings 57 and 57 are mounted are provided. The supported portion 53 is inserted into the bearing portion 21, and the gap with the bearing portion 21 is sealed by O-rings 57 and 57.
  • the valve body attaching portion 54 is provided at the lower end portion (one end portion) of the valve shaft 50 and is formed in a cylindrical shape having an outer diameter larger than the inner diameter of the bearing portion 21.
  • a shaft portion insertion hole 55 into which the shaft portion 35 of the valve body 30 is inserted is formed in the lower end surface of the valve body mounting portion 54.
  • the shaft portion insertion hole 55 is formed in a shape that is the same as or slightly larger than the cross-sectional shape (lateral cross-sectional shape) orthogonal to the axial direction (direction along the axis L) of the shaft portion 35. Therefore, the shaft portion 35 inserted into the shaft portion insertion hole 55 is movable in the axial direction.
  • the shaft portion insertion hole 55 is formed in a hexagonal shape, and the shaft portion 35 of the valve body 30 and the shaft portion insertion hole 55 are fitted to each other.
  • the body 30 is rotated.
  • the shaft portion insertion hole 55 may be formed in a shape in which the shaft portion 35 is inserted, the shaft portion 35 can move in the axial direction, and the valve body 30 rotates as the valve shaft 50 rotates.
  • an accommodation space 56 for accommodating the elastic member 60 is formed in the valve body 30 and the valve shaft 50.
  • the valve body attaching portion 54 is provided with a pressure equalizing hole 58 that allows the accommodation space 56 and the space inside the valve chamber to communicate with each other.
  • the pressure equalizing hole 58 may be provided in the valve body 30.
  • the elastic member 60 is a helical coil spring.
  • the elastic member 60 is disposed in the accommodation space 56 in a state compressed in the axial direction.
  • the elastic member 60 presses the valve body 30 against the valve seat surface 15 by a restoring force.
  • the elastic member 60 may be made of a rubber material or the like other than the coil spring.
  • the positioning boss 18, the bearing portion 21, the shaft portion 35 and the positioning hole 38 of the valve body 30, the valve shaft 50, and the elastic member 60 are arranged so that their respective axis centers coincide with the axis L.
  • the axis L coincides with the rotation axis of the valve body 30 and is orthogonal to the valve seat surface 15.
  • valve shaft 50 is rotated about the axis L by the rotational driving force of the drive mechanism of the drive unit 40, and the valve body 30 is rotated on the valve seat surface 15 as the valve shaft 50 rotates.
  • the valve shaft 50 is rotated about the axis L by the rotational driving force of the drive mechanism of the drive unit 40, and the valve body 30 is rotated on the valve seat surface 15 as the valve shaft 50 rotates.
  • the annular member 31 overlaps the annular portion 15 a surrounding the first port 16 of the valve seat surface 15, and the circular plate member 32 surrounds the second port 17 of the valve seat surface 15. It overlaps with the part 15a.
  • the valve chamber 14 communicates with the first outlet channel 12 via the through hole 34 c of the valve body 30, the annular member 31, and the first port 16. Further, the second port 17 is closed by the disc member 32, and the valve chamber 14 and the second outlet channel 13 are blocked.
  • valve body 30 In the second rotational position, the valve body 30 is overlapped with the annular portion 15 a surrounding the second port 17 of the valve seat surface 15 by the annular member 31, and the disc member 32 connects the first port 16 of the valve seat surface 15. It overlaps the surrounding annular part 15a.
  • the valve chamber 14 communicates with the second outlet channel 13 via the through hole 34 c of the valve body 30, the annular member 31, and the second port 17. Further, the first port 16 is closed by the disc member 32, and the valve chamber 14 and the first outlet channel 12 are blocked.
  • the valve body 30 is attached to the valve shaft 50 so as to be movable in the axial direction by inserting the shaft portion 35 into the shaft portion insertion hole 55 of the valve shaft 50.
  • the compressed elastic member 60 is disposed in the accommodating space 56 in the valve body 30 and the valve shaft 50, thereby pressing the valve body 30 against the valve seat surface 15. Thereby, the valve body 30 can be stably adhered to the valve seat surface 15.
  • the valve body 30 is movable in the axial direction to the valve body mounting portion 54 of the valve shaft 50 that is arranged orthogonal to the valve seat surface 15. Attached to.
  • An elastic member 60 compressed in the axial direction is provided between the valve body 30 and the valve shaft 50. Since the valve body 30 is pressed against the valve seat surface 15 by the restoring force of the elastic member 60, the sealing performance between the valve body 30 and the valve seat surface 15 can be stably secured. . Further, even when the valve body 30 is separated from the valve seat surface 15 due to the fluid pressure, it can be reliably returned to the original state by the restoring force of the elastic member. Sealability can be ensured reliably.
  • the elastic member 60 is disposed in the accommodating space 56 in the valve body 30 and the valve shaft 50. By doing so, since the elastic member 60 is surrounded by the valve body 30 and the valve shaft 50 and is not exposed to the outside, the influence of the fluid on the elastic member 60 is reduced, and the valve body 30 is attached to the valve seat surface 15. Can be pressed stably. Moreover, it can suppress that the elastic member 60 contacts with another member by the influence of a fluid.
  • valve shaft 50 is provided with a pressure equalizing hole 58 that allows the accommodation space 56 to communicate with the valve chamber 14 outside thereof. By doing so, the pressure difference between the accommodation space 56 and the outside thereof is eliminated, and the valve body 30 can move stably with respect to the valve shaft 50.
  • valve body 10 is provided with a positioning boss 18 coaxial with the rotational axis of the valve body 30, and the valve body 30 is provided with a positioning hole 38 into which the positioning boss 18 is rotatably inserted.
  • the valve body 30 can be arrange
  • valve seat surface 15 protrudes from the inner wall surface 10 c of the valve body 10.
  • valve seat surface 15 has annular portions 15a and 15a surrounding the first port 16 and the second port 17, and connecting portions 15b and 15b connecting the annular portions 15a and 15a.
  • the connecting portions 15b and 15b are arranged so as to be shifted inward with respect to a virtual regular circle VC passing through the centers O and O of the annular portions 15a and 15a.
  • the valve body 30 is in contact with the valve seat surface 15 and overlaps with the annular portions 15a and 15a at the first rotational position and the second rotational position, and the annular member 31, And a valve body main body 33 that holds the disc member 32 rotatably in the circumferential direction.
  • SYMBOLS 1 Flow path switching valve, 10 ... Valve body, 10a ... Peripheral wall part, 10b ... Bottom wall part, 10c ... Inner wall surface, 11 ... Inlet flow path, 12 ... 1st exit flow path, 13 ... 2nd exit flow path, DESCRIPTION OF SYMBOLS 14 ... Valve chamber, 15 ... Valve seat surface, 15a ... Annular part, 15b ... Connection part, 16 ... 1st port, 17 ... 2nd port, 18 ... Positioning boss, 20 ... Lid, 21 ... Bearing part, 30 ... Valve body, 31 ... annular member, 32 ... disc member, 33 ... valve body main body part, 34 ...
  • valve part 34a ... lower surface, 34b ... rib, 34c ... through hole, 34d ... upper surface, 35 ... shaft part, 38 ... Positioning hole, 40 ... Drive part, 41 ... Drive part case, 50 ... Valve shaft, 51 ... D cut part, 52 ... Serration part, 53 ... Supported part, 53a ... Groove part, 54 ... Valve body attaching part, 55 ... Shaft portion insertion hole, 56 ... accommodating space, 57 ... O-ring, 58 ... equal pressure hole, 60 ... elastic member, L ... axis, O ... po Door of the center, VC ... virtual circle, VO ... virtual ellipse

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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

[Problem] To provide a flow passage switching valve in which the performance of sealing between a valve body and a valve seat surface can be effectively ensured. [Solution] A flow passage switching valve 1 has: a valve main body 10 in which a valve chamber 14 is provided; a valve body 30 which is rotatably disposed on a valve seat surface 15 located within the valve chamber 14 and which, depending on the rotational position, opens and closes a first port 16 and a second port 17 which are provided in the valve seat surface 15; a drive section 40 which has a drive mechanism for rotating the valve body 30; and a valve shaft 50 which connects the valve body 30 and the drive mechanism. The valve shaft 50 is disposed perpendicular to the valve seat surface 15, and the valve body 30 is mounted on the lower end of the valve shaft 50 so as to be movable in an axial direction. An elastic member 60 which is compressed in the axial direction is provided between the valve body 30 and the valve shaft 50.

Description

流路切換弁Flow path switching valve
　本発明は、流路切換弁に関する。 The present invention relates to a flow path switching valve.
　従来の流路切換弁である三方弁の一例が特許文献１に開示されている。図８に示すように、この三方弁１００は、弁軸１３０と、弁軸１３０を回転駆動するためのモーター１０５と、このモーター１０５が取り付けられる弁本体１１０と、を備える。弁本体１１０には、流入口１２０と、第１流出口１２１と、第２流出口１２２と、が設けられている。さらに、弁本体１１０には、弁軸１３０がＯリング１３５、１３５を介して回動可能かつ軸方向に移動可能に水密的に嵌挿される弁軸嵌挿部１１２と、弁軸嵌挿部１１２の下部外周に弁体受け座１１５が設けられている。この弁体受け座１１５の下面全体は平滑面とされている。 An example of a three-way valve that is a conventional flow path switching valve is disclosed in Patent Document 1. As shown in FIG. 8, the three-way valve 100 includes a valve shaft 130, a motor 105 for rotationally driving the valve shaft 130, and a valve main body 110 to which the motor 105 is attached. The valve main body 110 is provided with an inlet 120, a first outlet 121, and a second outlet 122. Further, the valve main body 110 has a valve shaft fitting insertion portion 112 into which the valve shaft 130 is fitted in a watertight manner so as to be rotatable through the O- rings 135 and 135 and movable in the axial direction, and a valve shaft fitting insertion portion 112. A valve seat 115 is provided on the outer periphery of the lower part of the valve body. The entire lower surface of the valve seat 115 is a smooth surface.
　弁軸１３０における弁体受け座１１５より下方に突出した下端部には、弁軸１３０と一体的に回動可能に弁体１４０が取り付けられている。弁体１４０は、二重円筒構造とされ、内筒部１４１と外筒部１４２との間に、上下方向に貫通する縦貫通路１５１と上面が開口した溝状通路１５２とが設けられている。 A valve body 140 is attached to a lower end portion of the valve shaft 130 protruding downward from the valve body receiving seat 115 so as to be rotatable integrally with the valve shaft 130. The valve body 140 has a double cylindrical structure, and a vertical through passage 151 penetrating in the vertical direction and a groove-like passage 152 having an open upper surface are provided between the inner cylinder portion 141 and the outer cylinder portion 142.
　弁軸１３０は、弁本体１１０内の流体（湯水）圧力と大気圧との差圧により弁体１４０を伴って上側に引き上げられて、弁体１４０の上面が弁体受け座１１５の下面に押し付けられる。これにより、縦貫通路１５１と溝状通路１５２との間が水密的にシールされる。 The valve shaft 130 is pulled upward together with the valve body 140 due to the pressure difference between the fluid (hot water) pressure in the valve body 110 and the atmospheric pressure, and the upper surface of the valve body 140 is pressed against the lower surface of the valve body receiving seat 115. It is done. As a result, the space between the longitudinal through passage 151 and the groove-like passage 152 is sealed in a watertight manner.
　三方弁１００は、弁体１４０が図８に示す回転位置にある状態において、流入口１２０から流れ込んだ流体が、縦貫通路１５１を通り、第１流出口１２１から流れ出る。このときの流体の流れを実線の矢印で模式的に示す。また、三方弁１００は、弁体１４０が図８に示す回転位置から所定角度回転させた他の回転位置にある状態において、流入口１２０から流れ込んだ流体が、溝状通路１５２を通り、第２流出口１２２から流れ出る。このときの流体の流れを破線の矢印で模式的に示す。 In the three-way valve 100, in a state where the valve body 140 is at the rotational position shown in FIG. 8, the fluid that has flowed from the inlet 120 flows out from the first outlet 121 through the longitudinal through passage 151. The flow of the fluid at this time is schematically shown by a solid line arrow. Further, in the three-way valve 100, in a state where the valve body 140 is at another rotational position rotated by a predetermined angle from the rotational position shown in FIG. It flows out from the outlet 122. The flow of the fluid at this time is schematically indicated by a dashed arrow.
特開２０１６－２９３０５号公報JP 2016-29305 A
　上述した三方弁１００は、弁本体１１０内の流体圧力と大気圧との差圧により、弁体１４０の上面を弁体受け座１１５の下面に押し付けることで、これらの間をシールしている。そのため、流体圧力や大気圧が変動した場合に、安定したシール性を確保できないおそれがある。また、三方弁１００において、樹脂製の弁本体１１０および弁体１４０を採用した構成では、弁体１４０の上面や弁体受け座１１５の下面のように比較的広い部分について高い面精度を得ることが難しく、シール性の確保がより困難となる。 The above-described three-way valve 100 seals a space between the valve body 140 by pressing the upper surface of the valve body 140 against the lower surface of the valve body receiving seat 115 due to the differential pressure between the fluid pressure in the valve body 110 and the atmospheric pressure. Therefore, when the fluid pressure or atmospheric pressure fluctuates, there is a possibility that stable sealing performance cannot be ensured. Further, in the configuration in which the resin valve body 110 and the valve body 140 are employed in the three-way valve 100, high surface accuracy is obtained for a relatively wide portion such as the upper surface of the valve body 140 and the lower surface of the valve body receiving seat 115. It is difficult to secure the sealing property.
　また、上述した三方弁１００では、例えば、流入口１２０から第１流出口１２１に流体が流れている状態において、何らかの原因で第２流出口１２２の流体圧力が上昇すると、弁体１４０に下向きの力が加わり、弁軸１３０および弁体１４０が下方に移動する。これにより、弁体１４０の上面と弁体受け座１１５の下面との間に隙間が生じて、流体圧力を流入口１２０および第１流出口１２１に逃がすことができる。その後、第２流出口１２２の流体圧力が低下して通常圧力に復帰すると、弁本体１１０内の流体圧力と大気圧との差圧により弁軸１３０および弁体１４０に上向きの力が加わり、弁軸および弁体１４０が上方に移動する。このとき、Ｏリング１３５、１３５の摺動抵抗により、弁軸１３０および弁体１４０が元の位置に復帰できない可能性があり、弁体１４０の上面と弁体受け座１１５の下面との間のシール性を確保できないおそれがある。 In the above-described three-way valve 100, for example, when the fluid pressure at the second outlet 122 increases for some reason in the state where the fluid flows from the inlet 120 to the first outlet 121, the valve element 140 faces downward. A force is applied, and the valve shaft 130 and the valve body 140 move downward. As a result, a gap is created between the upper surface of the valve body 140 and the lower surface of the valve body receiving seat 115, and fluid pressure can be released to the inlet 120 and the first outlet 121. Thereafter, when the fluid pressure at the second outlet 122 decreases and returns to the normal pressure, an upward force is applied to the valve shaft 130 and the valve body 140 due to the differential pressure between the fluid pressure in the valve body 110 and the atmospheric pressure, and the valve The shaft and valve body 140 move upward. At this time, there is a possibility that the valve shaft 130 and the valve body 140 cannot return to their original positions due to the sliding resistance of the O- rings 135, 135, and the gap between the upper surface of the valve body 140 and the lower surface of the valve body seat 115 There is a possibility that the sealing performance cannot be secured.
　そこで、本発明は、弁体と弁座面との間のシール性を効果的に確保することができる流路切換弁を提供することを目的とする。 Therefore, an object of the present invention is to provide a flow path switching valve capable of effectively ensuring the sealing performance between the valve body and the valve seat surface.
　上記目的を達成するために、本発明の一態様に係る流路切換弁は、弁室が設けられた弁本体と、前記弁室内の弁座面上に回転可能に配置され、回転位置に応じて前記弁座面に設けられたポートを開閉する弁体と、前記弁体を回転させる駆動機構を有する駆動部と、前記弁体と前記駆動機構とを接続する弁軸と、を有する流路切換弁であって、前記弁軸が、前記弁座面に対して直交して配置され、前記弁体が、前記弁軸の一端部に軸方向に移動可能に取り付けられ、前記弁体と前記弁軸との間に、軸方向に圧縮された弾性部材が設けられていることを特徴とする。 In order to achieve the above object, a flow path switching valve according to one aspect of the present invention is disposed rotatably on a valve body provided with a valve chamber and a valve seat surface in the valve chamber, and according to the rotational position. And a valve body that opens and closes a port provided on the valve seat surface, a drive unit that includes a drive mechanism that rotates the valve body, and a valve shaft that connects the valve body and the drive mechanism. A switching valve, wherein the valve shaft is disposed perpendicular to the valve seat surface, the valve body is attached to one end of the valve shaft so as to be movable in the axial direction, and the valve body and the valve An elastic member compressed in the axial direction is provided between the valve shaft and the valve shaft.
　本発明によれば、弁体が、弁座面に対して直交して配置された弁軸の一端部に軸方向に移動可能に取り付けられ、弁体と弁軸との間に、軸方向に圧縮された弾性部材が設けられている。このようにしたことから、弾性部材の復元力によって弁体が弁座面に押しつけられるので、弁体と弁座面との間のシール性を安定して確保することができる。また、流体圧力によって弁体が弁座面から離れた場合でも、弾性部材の復元力によって確実に元の状態に復帰させることができ、弁体と弁座面との間のシール性を確実に確保することができる。 According to the present invention, the valve body is attached to one end portion of the valve shaft disposed orthogonal to the valve seat surface so as to be movable in the axial direction, and between the valve body and the valve shaft in the axial direction. A compressed elastic member is provided. Since it did in this way, since a valve body is pressed on a valve seat surface with the restoring force of an elastic member, the sealing performance between a valve body and a valve seat surface can be ensured stably. Even when the valve body is separated from the valve seat surface by fluid pressure, it can be reliably restored to its original state by the restoring force of the elastic member, and the sealing performance between the valve body and the valve seat surface is ensured. Can be secured.
　本発明において、前記弾性部材が、前記弁体および前記弁軸内の収容空間に配置されていることが好ましい。このようにすることで、弾性部材が弁体および弁軸に囲われて外部に露出しないので、弾性部材への流体の影響を低減して、弁体を弁座面に安定して押しつけることができる。また、弾性部材が流体の影響により他の部材と接触することを抑制できる。 In the present invention, it is preferable that the elastic member is disposed in a housing space in the valve body and the valve shaft. By doing so, since the elastic member is surrounded by the valve body and the valve shaft and is not exposed to the outside, the influence of the fluid on the elastic member can be reduced and the valve body can be stably pressed against the valve seat surface. it can. Moreover, it can suppress that an elastic member contacts another member by the influence of a fluid.
　本発明において、前記弁体または前記弁軸には、前記収容空間とその外部とを連通する均圧孔が設けられていることが好ましい。このようにすることで、収容空間とその外部との圧力差をなくして、弁体が弁軸に対して安定して移動することができる。 In the present invention, it is preferable that the valve body or the valve shaft is provided with a pressure equalizing hole that communicates the housing space with the outside. By doing so, the pressure difference between the accommodating space and the outside thereof can be eliminated, and the valve body can move stably with respect to the valve shaft.
　本発明において、前記弁本体および前記弁体の一方には、前記弁体の回転軸と同軸の位置決めボスが設けられ、他方には、前記位置決めボスが回転可能に挿入される位置決め穴が設けられていることが好ましい。このようにすることで、弁体を容易に精度よく配置することができる。 In the present invention, one of the valve body and the valve body is provided with a positioning boss coaxial with the rotating shaft of the valve body, and the other is provided with a positioning hole into which the positioning boss is rotatably inserted. It is preferable. By doing in this way, a valve body can be arrange | positioned easily and accurately.
　本発明において、前記弁座面が、前記弁本体の内壁面から突出していることが好ましい。このようにすることで、弁座面における弁体に当接する面積を少なくすることができ、単位面積あたりの弁体を弁座面に押しつける力（圧力）を高めてシール性をより効果的に確保することができる。 In the present invention, it is preferable that the valve seat surface protrudes from an inner wall surface of the valve body. By doing so, the area of the valve seat surface that contacts the valve body can be reduced, and the force (pressure) that presses the valve body per unit area against the valve seat surface can be increased to improve the sealing performance more effectively. Can be secured.
　本発明において、前記弁座面が、複数の前記ポート、前記複数のポートのそれぞれを囲む複数の環状部、および前記環状部同士を接続する連結部を有し、前記連結部が、前記複数の環状部の中心を通る仮想正円に対して、内側または外側にずれて配置され、前記弁体が、前記弁座面に当接される円形部材と、前記円形部材を周方向に回転可能に保持する弁体本体部と、を有していることが好ましい。このようにすることで、弁体の回転（公転）に伴って円形部材が回転（自転）するので、弁座面との摺動による弁体の偏摩耗を低減することができる。本発明において、前記弁体の回転軸方向からみて、前記円形部材を周方向に回転させた際の該円形部材の中心の軌跡は、前記仮想正円と一致していることが好ましい。 In the present invention, the valve seat surface includes a plurality of the ports, a plurality of annular portions surrounding each of the plurality of ports, and a connecting portion that connects the annular portions, and the connecting portion includes the plurality of the plurality of ports. A circular member that is disposed inward or outward with respect to a virtual perfect circle passing through the center of the annular portion, and the valve body is in contact with the valve seat surface, and the circular member is rotatable in the circumferential direction. It is preferable to have the valve body main body part to hold | maintain. By doing in this way, since a circular member rotates (autorotates) with rotation (revolution) of a valve body, the partial wear of the valve body by sliding with a valve seat surface can be reduced. In this invention, it is preferable that the locus | trajectory of the center of this circular member when the said circular member is rotated to the circumferential direction sees the said virtual perfect circle seeing from the rotating shaft direction of the said valve body.
　本発明において、前記弁座面が、複数の前記ポート、前記複数のポートのそれぞれを囲む複数の環状部、および前記環状部同士を接続する連結部を有し、前記連結部が、前記複数の環状部の中心を通る仮想楕円に沿って配置され、前記弁体が、前記弁座面に当接される円形部材と、前記円形部材を周方向に回転可能に保持する弁体本体部と、を有していることが好ましい。このようにすることで、弁体の回転（公転）に伴って円形部材が回転（自転）、若しくは円形部材の環状部との摺動部位を分散できるので、弁座面との摺動による弁体の偏摩耗を低減することができる。 In the present invention, the valve seat surface includes a plurality of the ports, a plurality of annular portions surrounding each of the plurality of ports, and a connecting portion that connects the annular portions, and the connecting portion includes the plurality of the plurality of ports. A circular member disposed along a virtual ellipse passing through the center of the annular portion, the valve body being in contact with the valve seat surface, and a valve body main body portion rotatably holding the circular member in the circumferential direction; It is preferable to have. By doing so, the circular member rotates (revolves) along with the rotation (revolution) of the valve body, or the sliding portion with the annular portion of the circular member can be dispersed. Uneven wear of the body can be reduced.
　本発明によれば、弁体と弁座面と間のシール性を効果的に確保することができる。 According to the present invention, it is possible to effectively ensure the sealing performance between the valve body and the valve seat surface.
本発明の一実施形態に係る流路切換弁の断面図である。It is sectional drawing of the flow-path switching valve which concerns on one Embodiment of this invention. 図１の流路切換弁における弁体の回転位置が異なる他の断面図である。FIG. 6 is another cross-sectional view in which the rotational position of the valve body in the flow path switching valve in FIG. 1 is different. 図２の断面図を斜め方向から見た拡大断面図である。It is the expanded sectional view which looked at sectional drawing of FIG. 2 from the diagonal direction. 図１の流路切換弁の分解斜視図である。It is a disassembled perspective view of the flow-path switching valve of FIG. 図１の流路切換弁の弁本体の斜視図である。It is a perspective view of the valve main body of the flow-path switching valve of FIG. 図５の弁本体の弁座面の平面図である。It is a top view of the valve seat surface of the valve main body of FIG. 図１の流路切換弁の弁体および弁軸の斜視図である。It is a perspective view of the valve body and valve stem of the flow-path switching valve of FIG. 従来の流路切換弁を示す断面図である。It is sectional drawing which shows the conventional flow-path switching valve.
　以下、本発明の一実施形態に係る流路切換弁の構成について、図１～図７を参照して説明する。 Hereinafter, the configuration of a flow path switching valve according to an embodiment of the present invention will be described with reference to FIGS.
　図１および図２は、本発明の一実施形態に係る流路切換弁の弁体の回転軸に沿う断面図（縦断面図）である。図１は、弁体が第１回転位置にある状態を示し、図２は、弁体が第１回転位置から１８０度回転した第２回転位置にある状態を示す。図１、図２において、流体の流れを矢印で模式的に示している。図３は、図２の流路切換弁の縦断面を斜め方向から見た拡大断面図である。図４は、図１の流路切換弁の分解斜視図である。図５は、図１の流路切換弁の弁本体の斜視図である。図６は、図５の弁本体の弁座面およびその変形例の平面図である。図６（ａ）は、弁座面の連結部が仮想正円の内側にずれて配置された構成を示し、図６（ｂ）は、弁座面の連結部が仮想楕円に沿って配置された変形例の構成を示す。図７は、図１の流路切換弁の弁体および弁軸の斜視図である。なお、本明細書において、「上下左右」は各図において各部材の相対的な位置関係を示すために用いており、絶対的な位置関係を示すものではない。 1 and 2 are sectional views (longitudinal sectional views) taken along the rotation axis of the valve body of the flow path switching valve according to one embodiment of the present invention. FIG. 1 shows a state in which the valve body is in the first rotational position, and FIG. 2 shows a state in which the valve body is in the second rotational position rotated 180 degrees from the first rotational position. In FIG. 1 and FIG. 2, the flow of the fluid is schematically shown by arrows. FIG. 3 is an enlarged cross-sectional view of the flow path switching valve of FIG. 2 as viewed from an oblique direction. FIG. 4 is an exploded perspective view of the flow path switching valve of FIG. FIG. 5 is a perspective view of the valve body of the flow path switching valve of FIG. FIG. 6 is a plan view of the valve seat surface of the valve main body of FIG. 5 and a modification thereof. FIG. 6A shows a configuration in which the connecting portion of the valve seat surface is displaced from the inside of the virtual perfect circle, and FIG. 6B shows the configuration in which the connecting portion of the valve seat surface is arranged along the virtual ellipse. The structure of the modified example is shown. FIG. 7 is a perspective view of the valve body and the valve shaft of the flow path switching valve of FIG. 1. In the present specification, “up, down, left and right” is used in each drawing to indicate the relative positional relationship between the members, and does not indicate an absolute positional relationship.
　図１～図４に示すように、本実施形態の流路切換弁１は、弁本体１０と、蓋体２０と、弁体３０と、駆動部４０と、弁軸５０と、弾性部材６０と、を有している。 As shown in FIGS. 1 to 4, the flow path switching valve 1 of the present embodiment includes a valve body 10, a lid body 20, a valve body 30, a drive unit 40, a valve shaft 50, an elastic member 60, and the like. ,have.
　弁本体１０は、合成樹脂を材料として、上部が開口した略有底円筒状に形成されている。弁本体１０の周壁部１０ａには、一方向（図１、図２の左方向）に延びる入口流路１１が設けられている。弁本体１０の底壁部１０ｂには、下方に向かったのち入口流路１１と反対の他方向（図１、図２の右方向）に延びる第１出口流路１２が設けられている。また、弁本体１０の底壁部１０ｂには、下方に延びる第２出口流路１３が設けられている。入口流路１１と第１出口流路１２と第２出口流路１３とは、弁本体１０内に設けられた弁室１４に通じている。弁室１４に通じる流路は、２つまたは４つ以上設けられていてもよい。弁本体１０の底壁部１０ｂの内壁面１０ｃには、弁座面１５が設けられている。 The valve body 10 is made of a synthetic resin as a material and is formed in a substantially bottomed cylindrical shape having an open top. An inlet channel 11 extending in one direction (the left direction in FIGS. 1 and 2) is provided in the peripheral wall portion 10a of the valve body 10. The bottom wall portion 10b of the valve body 10 is provided with a first outlet channel 12 that extends downward and extends in the other direction opposite to the inlet channel 11 (the right direction in FIGS. 1 and 2). In addition, a second outlet channel 13 extending downward is provided in the bottom wall portion 10 b of the valve body 10. The inlet channel 11, the first outlet channel 12, and the second outlet channel 13 communicate with a valve chamber 14 provided in the valve body 10. Two or four or more flow paths leading to the valve chamber 14 may be provided. A valve seat surface 15 is provided on the inner wall surface 10 c of the bottom wall portion 10 b of the valve body 10.
　図５に示すように、弁座面１５は、底壁部１０ｂの内壁面１０ｃより上方に０．１ｍｍ～５．０ｍｍ程度突出した平滑面である。弁座面１５には、第１出口流路１２に通じる第１ポート１６と、第２出口流路１３に通じる第２ポート１７とが開口して設けられている。出口流路に通じるポートは、出口流路の数に応じて複数設けられる。弁座面１５は、第１ポート１６および第２ポート１７を囲む２つの円形の環状部１５ａ、１５ａと、環状部１５ａ、１５ａ同士を接続する２つの連結部１５ｂ、１５ｂと、を有している。環状部１５ａ、１５ａと連結部１５ｂ、１５ｂとは面一で連なっている。 As shown in FIG. 5, the valve seat surface 15 is a smooth surface protruding about 0.1 mm to 5.0 mm above the inner wall surface 10c of the bottom wall portion 10b. The valve seat surface 15 is provided with a first port 16 that communicates with the first outlet channel 12 and a second port 17 that communicates with the second outlet channel 13. A plurality of ports communicating with the outlet channel are provided according to the number of outlet channels. The valve seat surface 15 includes two circular annular portions 15a and 15a surrounding the first port 16 and the second port 17, and two coupling portions 15b and 15b that connect the annular portions 15a and 15a to each other. Yes. The annular portions 15a and 15a and the connecting portions 15b and 15b are continuous with each other.
　本実施形態において、図６（ａ）に示すように、第１ポート１６および第２ポート１７の中心Ｏ、Ｏは、仮想正円ＶＣ上にその中心（軸線Ｌ）を挟んで径方向に対向して配置されている。すなわち、仮想正円ＶＣは、第１ポート１６および第２ポート１７の中心Ｏ、Ｏを通る。そして、連結部１５ｂ、１５ｂが、仮想正円ＶＣの内側にずれて配置されている。これ以外にも、図６（ｂ）に示すように、第１ポート１６および第２ポート１７の中心Ｏ、Ｏは、仮想楕円ＶＯ上にその中心（軸線Ｌ）を挟んで径方向（長径、短径でもよい）に対向して配置されており、連結部１５ｂ、１５ｂが、仮想楕円ＶＯに沿って配置されていてもよい。仮想楕円ＶＯは、第１ポート１６および第２ポート１７の中心Ｏ、Ｏを通る。または、連結部１５ｂ、１５ｂが、仮想正円ＶＣの外側にずれて配置されていてもよく、仮想正円ＶＣに沿って配置されていてもよい。 In the present embodiment, as shown in FIG. 6A, the centers O and O of the first port 16 and the second port 17 are opposed to each other in the radial direction across the center (axis L) on the virtual perfect circle VC. Are arranged. That is, the virtual perfect circle VC passes through the centers O and O of the first port 16 and the second port 17. And the connection parts 15b and 15b are shifted | deviated and arrange | positioned inside the virtual perfect circle VC. In addition to this, as shown in FIG. 6 (b), the centers O, O of the first port 16 and the second port 17 are arranged in a radial direction (major axis, long axis, sandwiching the center (axis L) on the virtual ellipse VO. The connecting portions 15b and 15b may be disposed along the virtual ellipse VO. The virtual ellipse VO passes through the centers O and O of the first port 16 and the second port 17. Alternatively, the connecting portions 15b and 15b may be disposed outside the virtual perfect circle VC, or may be disposed along the virtual perfect circle VC.
　本実施形態において、弁本体１０は金型に樹脂材料を射出する射出成形により得られる。そして、弁座面１５が内壁面１０ｃから突出していることから、弁座面１５を金型本体に組み込まれるコマにより成形することで、コマのみ高い面精度を必要とし、内壁面１０ｃなどの他の部分を成形する金型本体などについては高い面精度を不要とすることができる。これにより、内壁面１０ｃ全体を弁座面とした場合に比べて面積の小さい弁座面１５について、安価に面精度を高めることができ、シール性を効果的に確保することができる。 In the present embodiment, the valve body 10 is obtained by injection molding in which a resin material is injected into a mold. Since the valve seat surface 15 protrudes from the inner wall surface 10c, the valve seat surface 15 is molded with a frame incorporated in the mold body, so that only the frame requires high surface accuracy, and the inner wall surface 10c, etc. High surface accuracy can be dispensed with for a mold body or the like that molds this part. As a result, the surface accuracy of the valve seat surface 15 having a smaller area than that when the entire inner wall surface 10c is used as the valve seat surface can be increased at low cost, and the sealing performance can be effectively ensured.
　弁座面１５における第１ポート１６と第２ポート１７との中間箇所には、円柱状の位置決めボス１８が立設されている。 A cylindrical positioning boss 18 is erected on the valve seat surface 15 at an intermediate position between the first port 16 and the second port 17.
　蓋体２０は、合成樹脂を材料として、略円柱状に形成されている。蓋体２０は、弁本体１０の上部開口を塞ぐように弁本体１０に固定して取り付けられ、弁本体１０とともに弁室１４を画定する。蓋体２０の中心には、後述する弁軸５０を回転可能に軸支する軸受部２１が設けられている。 The lid 20 is formed in a substantially cylindrical shape using a synthetic resin as a material. The lid 20 is fixedly attached to the valve body 10 so as to close the upper opening of the valve body 10, and defines the valve chamber 14 together with the valve body 10. At the center of the lid 20, a bearing portion 21 that rotatably supports a later-described valve shaft 50 is provided.
　弁体３０は、弁室１４に収容されて弁座面１５上に回転可能に配置される。弁体３０は、図１に示す第１回転位置および図２に示す第２回転位置に応じて弁座面１５に設けられた第１ポート１６および第２ポート１７を開閉する。弁体３０は、円形部材としての円環部材３１および円板部材３２と、弁体本体部３３と、を有している。 The valve body 30 is accommodated in the valve chamber 14 and is rotatably disposed on the valve seat surface 15. The valve body 30 opens and closes the first port 16 and the second port 17 provided on the valve seat surface 15 according to the first rotation position shown in FIG. 1 and the second rotation position shown in FIG. The valve body 30 includes an annular member 31 and a disk member 32 as a circular member, and a valve body main body 33.
　円環部材３１および円板部材３２は、例えば、ポリテトラフルオロエチレン（ＰＴＦＥ）やポリアセタール（ＰＯＭ）などの合成樹脂を切削加工により円環状および円板状に成形した部材である。円環部材３１および円板部材３２を切削加工により成形することで、射出成形に比べて面精度を高めることができる。円環部材３１および円板部材３２は、弁座面１５に当接されるとともに第１回転位置および第２回転位置において弁座面１５の環状部１５ａ，１５ａと重なる。弁体３０を回転軸周りに回転させたときに当該回転軸方向からみると、円環部材３１および円板部材３２の中心の軌跡は仮想正円ＶＣと一致している。 The annular member 31 and the disk member 32 are members formed into a ring shape and a disk shape by cutting a synthetic resin such as polytetrafluoroethylene (PTFE) or polyacetal (POM), for example. By forming the annular member 31 and the disk member 32 by cutting, the surface accuracy can be improved as compared with the injection molding. The annular member 31 and the disc member 32 are in contact with the valve seat surface 15 and overlap the annular portions 15a and 15a of the valve seat surface 15 at the first rotational position and the second rotational position. When the valve body 30 is rotated around the rotation axis, the central locus of the annular member 31 and the disk member 32 coincides with the virtual perfect circle VC when viewed from the direction of the rotation axis.
　弁体本体部３３は、弁部３４と、軸部３５と、を一体に有している。 The valve body main body 33 integrally includes a valve portion 34 and a shaft portion 35.
　弁部３４は、略長方形板状に形成されている。弁部３４の弁座面１５側の下面３４ａには、円環部材３１および円板部材３２の外径と同一または若干大きい内径を有する円環状のリブ３４ｂ、３４ｂが設けられている。弁部３４は、リブ３４ｂ、３４ｂの内側に円環部材３１および円板部材３２が配置されることで、弁座面１５との間で円環部材３１および円板部材３２を周方向に回転可能に保持する。また、弁部３４における円環部材３１の内縁内側に対応する箇所には貫通孔３４ｃが設けられている。なお、円板部材３２を円環部材３１に置き換えてもよく、また、円環部材３１および円板部材３２を省略し、第１回転位置および第２回転位置において、円環状のリブ３４ｂ、３４ｂが弁座面１５の環状部１５ａ，１５ａと重なるように弁体３０を構成してもよい。もちろん、円環部材３１および円板部材３２を弁体３０と一体に形成してもよい。 The valve part 34 is formed in a substantially rectangular plate shape. On the lower surface 34a on the valve seat surface 15 side of the valve portion 34, annular ribs 34b and 34b having inner diameters that are the same as or slightly larger than the outer diameters of the annular member 31 and the disk member 32 are provided. The valve part 34 rotates the ring member 31 and the disk member 32 in the circumferential direction between the valve seat surface 15 by arranging the ring member 31 and the disk member 32 inside the ribs 34b and 34b. Hold as possible. Further, a through hole 34 c is provided at a location corresponding to the inner edge of the annular member 31 in the valve portion 34. The disc member 32 may be replaced with the annular member 31, and the annular member 31 and the disc member 32 are omitted, and the annular ribs 34b and 34b are provided at the first rotational position and the second rotational position. The valve body 30 may be configured to overlap the annular portions 15a and 15a of the valve seat surface 15. Of course, the annular member 31 and the disk member 32 may be formed integrally with the valve body 30.
　軸部３５は、六角形柱状に形成され、弁部３４における弁座面１５側と反対側の上面３４ｄの中心に直交して立設されている。また、弁体本体部３３は、弁部３４の下面３４ａの中心に開口するように、位置決めボス１８が回転可能に挿入される位置決め穴３８が形成されている。なお、弁体本体部３３に位置決めボス１８を設け、弁本体１０に位置決め穴３８を設けてもよい。 The shaft portion 35 is formed in a hexagonal column shape, and is erected perpendicularly to the center of the upper surface 34d on the valve portion 34 opposite to the valve seat surface 15 side. Further, the valve body main body 33 is formed with a positioning hole 38 into which the positioning boss 18 is rotatably inserted so as to open at the center of the lower surface 34 a of the valve portion 34. The positioning boss 18 may be provided in the valve body main body 33 and the positioning hole 38 may be provided in the valve main body 10.
　駆動部４０は、図示しないモーターおよび減速機を組み合わせた駆動機構と、この駆動機構を収容する樹脂製の駆動部ケース４１と、を有している。駆動部ケース４１は、略直方体箱状に形成されている。駆動部ケース４１は、蓋体２０の上部に固定して取り付けられている。 The drive unit 40 includes a drive mechanism that combines a motor and a speed reducer (not shown), and a resin drive unit case 41 that houses the drive mechanism. The drive unit case 41 is formed in a substantially rectangular parallelepiped box shape. The drive unit case 41 is fixedly attached to the upper portion of the lid body 20.
　弁軸５０は、全体的に円柱状に形成されており、弁座面１５に直交するように配置される。弁軸５０は、上端から順に、Ｄカット部５１と、セレーション部５２と、被支持部５３と、弁体取付部５４と、を有している。 The valve shaft 50 is formed in a cylindrical shape as a whole, and is arranged so as to be orthogonal to the valve seat surface 15. The valve shaft 50 includes a D-cut portion 51, a serration portion 52, a supported portion 53, and a valve body attaching portion 54 in order from the upper end.
　Ｄカット部５１は、円柱の外周面の一部に平坦部が形成されており、弁軸５０の周方向の位置決めに用いられる。セレーション部５２は、駆動部４０の駆動機構の回転駆動力が与えられるギヤ状（セレーション）に形成されている。被支持部５３は、軸受部２１の内径より若干小さい外径を有する円柱状に形成されている。被支持部５３の外周面には、Ｏリング５７、５７が装着される溝部５３ａ、５３ａが設けられている。被支持部５３は、軸受部２１に挿入され、Ｏリング５７、５７によって軸受部２１との隙間が封止される。 The D-cut portion 51 has a flat portion formed on a part of the outer peripheral surface of the cylinder, and is used for positioning the valve shaft 50 in the circumferential direction. The serration unit 52 is formed in a gear shape (serration) to which the rotational driving force of the drive mechanism of the drive unit 40 is applied. The supported portion 53 is formed in a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the bearing portion 21. On the outer peripheral surface of the supported portion 53, groove portions 53a and 53a in which O- rings 57 and 57 are mounted are provided. The supported portion 53 is inserted into the bearing portion 21, and the gap with the bearing portion 21 is sealed by O- rings 57 and 57.
　弁体取付部５４は、弁軸５０の下端部（一端部）に設けられており、軸受部２１の内径より大きい外径を有する円柱状に形成されている。弁体取付部５４の下端面には、弁体３０の軸部３５が挿入される軸部挿入穴５５が形成されている。軸部挿入穴５５は、軸部３５の軸方向（軸線Ｌに沿う方向）と直交する断面形状（横断面形状）と同一または若干大きめの形状に形成されている。そのため、軸部挿入穴５５に挿入された軸部３５は、軸方向に移動可能である。また、本実施形態においては、軸部挿入穴５５は六角形状に形成されており、弁体３０の軸部３５と軸部挿入穴５５とが嵌まり合い、弁軸５０の回転に伴って弁体３０が回転される。軸部挿入穴５５は、軸部３５が挿入され、軸部３５が軸方向に移動可能であるとともに、弁軸５０の回転に伴って弁体３０が回転する形状に形成されていればよい。また、弁軸５０の軸部挿入穴５５に軸部３５が挿入されることで、弁体３０および弁軸５０内に弾性部材６０を収容する収容空間５６が形成される。弁体取付部５４には、収容空間５６とその外部の弁室内の空間とを連通する均圧孔５８が設けられている。均圧孔５８は、弁体３０に設けられていてもよい。 The valve body attaching portion 54 is provided at the lower end portion (one end portion) of the valve shaft 50 and is formed in a cylindrical shape having an outer diameter larger than the inner diameter of the bearing portion 21. A shaft portion insertion hole 55 into which the shaft portion 35 of the valve body 30 is inserted is formed in the lower end surface of the valve body mounting portion 54. The shaft portion insertion hole 55 is formed in a shape that is the same as or slightly larger than the cross-sectional shape (lateral cross-sectional shape) orthogonal to the axial direction (direction along the axis L) of the shaft portion 35. Therefore, the shaft portion 35 inserted into the shaft portion insertion hole 55 is movable in the axial direction. Further, in this embodiment, the shaft portion insertion hole 55 is formed in a hexagonal shape, and the shaft portion 35 of the valve body 30 and the shaft portion insertion hole 55 are fitted to each other. The body 30 is rotated. The shaft portion insertion hole 55 may be formed in a shape in which the shaft portion 35 is inserted, the shaft portion 35 can move in the axial direction, and the valve body 30 rotates as the valve shaft 50 rotates. Further, by inserting the shaft portion 35 into the shaft portion insertion hole 55 of the valve shaft 50, an accommodation space 56 for accommodating the elastic member 60 is formed in the valve body 30 and the valve shaft 50. The valve body attaching portion 54 is provided with a pressure equalizing hole 58 that allows the accommodation space 56 and the space inside the valve chamber to communicate with each other. The pressure equalizing hole 58 may be provided in the valve body 30.
　弾性部材６０は、らせん状のコイルバネである。弾性部材６０は、収容空間５６に軸方向に圧縮された状態で配置されている。弾性部材６０は、復元力によって弁体３０を弁座面１５に押しつける。なお、弾性部材６０は、コイルバネ以外にも、ゴム材などで構成されていてもよい。 The elastic member 60 is a helical coil spring. The elastic member 60 is disposed in the accommodation space 56 in a state compressed in the axial direction. The elastic member 60 presses the valve body 30 against the valve seat surface 15 by a restoring force. The elastic member 60 may be made of a rubber material or the like other than the coil spring.
　位置決めボス１８、軸受部２１、弁体３０の軸部３５および位置決め穴３８、弁軸５０、ならびに、弾性部材６０は、それぞれの軸心が軸線Ｌと一致するように配置されている。軸線Ｌは、弁体３０の回転軸と一致し、弁座面１５と直交する。 The positioning boss 18, the bearing portion 21, the shaft portion 35 and the positioning hole 38 of the valve body 30, the valve shaft 50, and the elastic member 60 are arranged so that their respective axis centers coincide with the axis L. The axis L coincides with the rotation axis of the valve body 30 and is orthogonal to the valve seat surface 15.
　次に、本実施形態に係る流路切換弁１の動作（作用）について説明する。 Next, the operation (action) of the flow path switching valve 1 according to the present embodiment will be described.
　流路切換弁１は、駆動部４０の駆動機構の回転駆動力によって弁軸５０が軸線Ｌを中心に回転され、弁軸５０の回転に伴って弁体３０が弁座面１５上で回転されて第１回転位置および第２回転位置に位置づけられる。 In the flow path switching valve 1, the valve shaft 50 is rotated about the axis L by the rotational driving force of the drive mechanism of the drive unit 40, and the valve body 30 is rotated on the valve seat surface 15 as the valve shaft 50 rotates. Are positioned at the first rotation position and the second rotation position.
　弁体３０は、第１回転位置において、円環部材３１が弁座面１５の第１ポート１６を囲む環状部１５ａに重なり、円板部材３２が弁座面１５の第２ポート１７を囲む環状部１５ａに重なる。これにより、弁室１４が、弁体３０の貫通孔３４ｃ、円環部材３１および第１ポート１６を介して第１出口流路１２に通じる。また、円板部材３２によって第２ポート１７が閉じられて、弁室１４と第２出口流路１３とが遮断される。 In the valve body 30, in the first rotation position, the annular member 31 overlaps the annular portion 15 a surrounding the first port 16 of the valve seat surface 15, and the circular plate member 32 surrounds the second port 17 of the valve seat surface 15. It overlaps with the part 15a. As a result, the valve chamber 14 communicates with the first outlet channel 12 via the through hole 34 c of the valve body 30, the annular member 31, and the first port 16. Further, the second port 17 is closed by the disc member 32, and the valve chamber 14 and the second outlet channel 13 are blocked.
　また、弁体３０は、第２回転位置において、円環部材３１が弁座面１５の第２ポート１７を囲む環状部１５ａに重なり、円板部材３２が弁座面１５の第１ポート１６を囲む環状部１５ａに重なる。これにより、弁室１４が、弁体３０の貫通孔３４ｃ，円環部材３１および第２ポート１７を介して第２出口流路１３に通じる。また、円板部材３２によって第１ポート１６が閉じられて、弁室１４と第１出口流路１２とが遮断される。 In the second rotational position, the valve body 30 is overlapped with the annular portion 15 a surrounding the second port 17 of the valve seat surface 15 by the annular member 31, and the disc member 32 connects the first port 16 of the valve seat surface 15. It overlaps the surrounding annular part 15a. As a result, the valve chamber 14 communicates with the second outlet channel 13 via the through hole 34 c of the valve body 30, the annular member 31, and the second port 17. Further, the first port 16 is closed by the disc member 32, and the valve chamber 14 and the first outlet channel 12 are blocked.
　弁体３０は、軸部３５が弁軸５０の軸部挿入穴５５に挿入されることで、弁軸５０に軸方向に移動可能に取り付けられている。そして、弁体３０および弁軸５０内の収容空間５６に圧縮された弾性部材６０が配置されることにより、弁体３０が弁座面１５に押しつけられる。これにより、弁体３０を安定して弁座面１５に密着させることができる。 The valve body 30 is attached to the valve shaft 50 so as to be movable in the axial direction by inserting the shaft portion 35 into the shaft portion insertion hole 55 of the valve shaft 50. The compressed elastic member 60 is disposed in the accommodating space 56 in the valve body 30 and the valve shaft 50, thereby pressing the valve body 30 against the valve seat surface 15. Thereby, the valve body 30 can be stably adhered to the valve seat surface 15.
　また、例えば、弁体３０が第１回転位置にある状態において、第２出口流路１３の流体圧力が上昇した場合、弁体３０に上向きの力が生じる。この上向きの力が、弾性部材６０の復元力より大きくなると、弾性部材６０が軸方向に圧縮される。これにより、弁体３０が弁座面１５から離れるように軸方向に移動して、円板部材３２と弁座面１５との間に隙間が生じて流体圧力を逃がすことができる。その後、第２出口流路１３の流体圧力が低下して、弁体３０に生じる上向きの力が弾性部材６０の復元力より小さくなると、弾性部材６０が伸張する。これにより、弁体３０が弁座面１５に当接するように軸方向に移動して、円板部材３２が弁座面１５に密着される。弁体３０が第２回転位置にある状態においても同様である。 Further, for example, when the fluid pressure in the second outlet channel 13 rises in a state where the valve body 30 is in the first rotation position, an upward force is generated in the valve body 30. When this upward force becomes larger than the restoring force of the elastic member 60, the elastic member 60 is compressed in the axial direction. Thereby, the valve body 30 moves in the axial direction so as to be separated from the valve seat surface 15, and a gap is generated between the disc member 32 and the valve seat surface 15, so that fluid pressure can be released. Thereafter, when the fluid pressure in the second outlet channel 13 decreases and the upward force generated in the valve body 30 becomes smaller than the restoring force of the elastic member 60, the elastic member 60 expands. Accordingly, the valve body 30 moves in the axial direction so as to contact the valve seat surface 15, and the disc member 32 is brought into close contact with the valve seat surface 15. The same applies to the state in which the valve body 30 is in the second rotational position.
　以上より、本実施形態に係る流路切換弁１によれば、弁体３０が、弁座面１５に対して直交して配置された弁軸５０の弁体取付部５４に軸方向に移動可能に取り付けられる。そして、弁体３０と弁軸５０との間に、軸方向に圧縮された弾性部材６０が設けられている。このようにしたことから、弾性部材６０の復元力によって弁体３０が弁座面１５に押しつけられるので、弁体３０と弁座面１５との間のシール性を安定して確保することができる。また、流体圧力によって弁体３０が弁座面１５から離れた場合でも、弾性部材の復元力によって確実に元の状態に復帰させることができるので、弁体３０と弁座面１５との間のシール性を確実に確保することができる。 As described above, according to the flow path switching valve 1 according to the present embodiment, the valve body 30 is movable in the axial direction to the valve body mounting portion 54 of the valve shaft 50 that is arranged orthogonal to the valve seat surface 15. Attached to. An elastic member 60 compressed in the axial direction is provided between the valve body 30 and the valve shaft 50. Since the valve body 30 is pressed against the valve seat surface 15 by the restoring force of the elastic member 60, the sealing performance between the valve body 30 and the valve seat surface 15 can be stably secured. . Further, even when the valve body 30 is separated from the valve seat surface 15 due to the fluid pressure, it can be reliably returned to the original state by the restoring force of the elastic member. Sealability can be ensured reliably.
　また、弾性部材６０が、弁体３０および弁軸５０内の収容空間５６に配置されている。このようにすることで、弾性部材６０が弁体３０および弁軸５０に囲われて外部に露出しないので、弾性部材６０への流体の影響を低減して、弁体３０を弁座面１５に安定して押しつけることができる。また、弾性部材６０が流体の影響により他の部材と接触することを抑制できる。 The elastic member 60 is disposed in the accommodating space 56 in the valve body 30 and the valve shaft 50. By doing so, since the elastic member 60 is surrounded by the valve body 30 and the valve shaft 50 and is not exposed to the outside, the influence of the fluid on the elastic member 60 is reduced, and the valve body 30 is attached to the valve seat surface 15. Can be pressed stably. Moreover, it can suppress that the elastic member 60 contacts with another member by the influence of a fluid.
　また、弁軸５０には、収容空間５６とその外部の弁室１４とを連通する均圧孔５８が設けられている。このようにすることで、収容空間５６とその外部との圧力差をなくして、弁体３０が弁軸５０に対して安定して移動することができる。 Further, the valve shaft 50 is provided with a pressure equalizing hole 58 that allows the accommodation space 56 to communicate with the valve chamber 14 outside thereof. By doing so, the pressure difference between the accommodation space 56 and the outside thereof is eliminated, and the valve body 30 can move stably with respect to the valve shaft 50.
　また、弁本体１０には、弁体３０の回転軸と同軸の位置決めボス１８が設けられ、弁体３０には、位置決めボス１８が回転可能に挿入される位置決め穴３８が設けられている。このようにすることで、弁体３０を容易に精度よく配置することができる。 Further, the valve body 10 is provided with a positioning boss 18 coaxial with the rotational axis of the valve body 30, and the valve body 30 is provided with a positioning hole 38 into which the positioning boss 18 is rotatably inserted. By doing in this way, the valve body 30 can be arrange | positioned easily and accurately.
　また、弁座面１５が、弁本体１０の内壁面１０ｃから突出している。このようにすることで、弁座面１５における弁体３０に当接する面積を少なくすることができ、単位面積あたりの弁体３０を弁座面１５に押しつける力（圧力）を高めてシール性をより効果的に確保することができる。 Further, the valve seat surface 15 protrudes from the inner wall surface 10 c of the valve body 10. By doing in this way, the area which contacts the valve body 30 in the valve seat surface 15 can be decreased, the force (pressure) which presses the valve body 30 per unit area against the valve seat surface 15 is increased, and the sealing performance is increased. It can be secured more effectively.
　また、弁座面１５が、第１ポート１６および第２ポート１７を囲む環状部１５ａ，１５ａと、環状部１５ａ，１５ａ同士を接続する連結部１５ｂ、１５ｂと、を有している。連結部１５ｂ、１５ｂが、環状部１５ａ、１５ａの中心Ｏ、Ｏを通る仮想正円ＶＣに対して、内側にずれて配置されている。そして、弁体３０が、弁座面１５に当接されるとともに第１回転位置および第２回転位置において環状部１５ａ，１５ａと重なる円環部材３１および円板部材３２と、円環部材３１および円板部材３２を周方向に回転可能に保持する弁体本体部３３と、を有している。このようにすることで、弁体３０の回転（公転）に伴って円環部材３１および円板部材３２が回転（自転）するので、弁座面１５との摺動による弁体３０の偏摩耗を低減することができる。なお、図６（ｂ）に示すように、連結部１５ｂ、１５ｂが、仮想楕円ＶＯに沿って配置された構成でも同様の効果を奏する。さらに、連結部１５ｂ、１５ｂを仮想楕円ＶＯに沿って配置した構成では、円環部材３１および円板部材３２が自転しない場合（例えば、円環部材および円板部材を弁体と一体にした構成）であっても環状部１５ａ，１５ａとの摺動部位の集中を防ぎ、摩耗位置を分散できる。 Further, the valve seat surface 15 has annular portions 15a and 15a surrounding the first port 16 and the second port 17, and connecting portions 15b and 15b connecting the annular portions 15a and 15a. The connecting portions 15b and 15b are arranged so as to be shifted inward with respect to a virtual regular circle VC passing through the centers O and O of the annular portions 15a and 15a. The valve body 30 is in contact with the valve seat surface 15 and overlaps with the annular portions 15a and 15a at the first rotational position and the second rotational position, and the annular member 31, And a valve body main body 33 that holds the disc member 32 rotatably in the circumferential direction. By doing so, the annular member 31 and the disk member 32 rotate (rotate) with the rotation (revolution) of the valve body 30, so that the uneven wear of the valve body 30 due to sliding with the valve seat surface 15. Can be reduced. In addition, as shown in FIG.6 (b), there exists the same effect even if the connection parts 15b and 15b are arrange | positioned along the virtual ellipse VO. Further, in the configuration in which the connecting portions 15b and 15b are arranged along the virtual ellipse VO, the annular member 31 and the disc member 32 do not rotate (for example, the configuration in which the annular member and the disc member are integrated with the valve body). ), It is possible to prevent concentration of sliding portions with the annular portions 15a and 15a and to disperse wear positions.
　上記に本発明の実施形態を説明したが、本発明はこれらの例に限定されるものではない。前述の実施形態に対して、当業者が適宜、構成要素の追加、削除、設計変更を行ったものや、実施形態の特徴を適宜組み合わせたものも、本発明の趣旨に反しない限り、本発明の範囲に含まれる。 Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Those in which those skilled in the art appropriately added, deleted, and changed the design of the above-described embodiments, and combinations of the features of the embodiments as appropriate, are also within the scope of the present invention. Included in the range.
　１…流路切換弁、１０…弁本体、１０ａ…周壁部、１０ｂ…底壁部、１０ｃ…内壁面、１１…入口流路、１２…第１出口流路、１３…第２出口流路、１４…弁室、１５…弁座面、１５ａ…環状部、１５ｂ…連結部、１６…第１ポート、１７…第２ポート、１８…位置決めボス、２０…蓋体、２１…軸受部、３０…弁体、３１…円環部材、３２…円板部材、３３…弁体本体部、３４…弁部、３４ａ…下面、３４ｂ…リブ、３４ｃ…貫通孔、３４ｄ…上面、３５…軸部、３８…位置決め穴、４０…駆動部、４１…駆動部ケース、５０…弁軸、５１…Ｄカット部、５２…セレーション部、５３…被支持部、５３ａ…溝部、５４…弁体取付部、５５…軸部挿入穴、５６…収容空間、５７…Ｏリング、５８…均圧孔、６０…弾性部材、Ｌ…軸線、Ｏ…ポートの中心、ＶＣ…仮想正円、ＶＯ…仮想楕円
  DESCRIPTION OF SYMBOLS 1 ... Flow path switching valve, 10 ... Valve body, 10a ... Peripheral wall part, 10b ... Bottom wall part, 10c ... Inner wall surface, 11 ... Inlet flow path, 12 ... 1st exit flow path, 13 ... 2nd exit flow path, DESCRIPTION OF SYMBOLS 14 ... Valve chamber, 15 ... Valve seat surface, 15a ... Annular part, 15b ... Connection part, 16 ... 1st port, 17 ... 2nd port, 18 ... Positioning boss, 20 ... Lid, 21 ... Bearing part, 30 ... Valve body, 31 ... annular member, 32 ... disc member, 33 ... valve body main body part, 34 ... valve part, 34a ... lower surface, 34b ... rib, 34c ... through hole, 34d ... upper surface, 35 ... shaft part, 38 ... Positioning hole, 40 ... Drive part, 41 ... Drive part case, 50 ... Valve shaft, 51 ... D cut part, 52 ... Serration part, 53 ... Supported part, 53a ... Groove part, 54 ... Valve body attaching part, 55 ... Shaft portion insertion hole, 56 ... accommodating space, 57 ... O-ring, 58 ... equal pressure hole, 60 ... elastic member, L ... axis, O ... po Door of the center, VC ... virtual circle, VO ... virtual ellipse

Claims (8)

  1. 　弁室が設けられた弁本体と、前記弁室内の弁座面上に回転可能に配置され、回転位置に応じて前記弁座面に設けられたポートを開閉する弁体と、前記弁体を回転させる駆動機構を有する駆動部と、前記弁体と前記駆動機構とを接続する弁軸と、を有する流路切換弁であって、
    　前記弁軸が、前記弁座面に対して直交して配置され、
    　前記弁体が、前記弁軸の一端部に軸方向に移動可能に取り付けられ、
    　前記弁体と前記弁軸との間に、軸方向に圧縮された弾性部材が設けられていることを特徴とする流路切換弁。     A valve body provided with a valve chamber, a valve body rotatably disposed on a valve seat surface in the valve chamber, and opening and closing a port provided on the valve seat surface according to a rotational position; and the valve body A flow path switching valve having a drive unit having a drive mechanism to rotate, and a valve shaft connecting the valve body and the drive mechanism,
    The valve shaft is disposed orthogonal to the valve seat surface;
    The valve body is attached to one end of the valve shaft so as to be movable in the axial direction,
    A flow path switching valve characterized in that an elastic member compressed in the axial direction is provided between the valve body and the valve shaft.
  2. 　前記弾性部材が、前記弁体および前記弁軸内の収容空間に配置されていることを特徴とする請求項１に記載の流路切換弁。 The flow path switching valve according to claim 1, wherein the elastic member is disposed in a housing space in the valve body and the valve shaft.
  3. 　前記弁体または前記弁軸には、前記収容空間とその外部とを連通する均圧孔が設けられていることを特徴とする請求項２に記載の流路切換弁。 3. The flow path switching valve according to claim 2, wherein a pressure equalizing hole is provided in the valve body or the valve shaft so as to communicate the accommodating space with the outside thereof.
  4. 　前記弁本体および前記弁体の一方には、前記弁体の回転軸と同軸の位置決めボスが設けられ、他方には、前記位置決めボスが回転可能に挿入される位置決め穴が設けられていることを特徴とする請求項１～請求項３のいずれか一項に記載の流路切換弁。 One of the valve body and the valve body is provided with a positioning boss coaxial with the rotation axis of the valve body, and the other is provided with a positioning hole into which the positioning boss is rotatably inserted. The flow path switching valve according to any one of claims 1 to 3, characterized in that:
  5. 　前記弁座面が、前記弁本体の内壁面から突出していることを特徴とする請求項１～請求項４のいずれか一項に記載の流路切換弁。 The flow path switching valve according to any one of claims 1 to 4, wherein the valve seat surface protrudes from an inner wall surface of the valve body.
  6. 　前記弁座面が、複数の前記ポート、前記複数のポートのそれぞれを囲む複数の環状部、および前記環状部同士を接続する連結部を有し、
    　前記連結部が、前記複数の環状部の中心を通る仮想正円に対して、内側または外側にずれて配置され、
    　前記弁体が、前記弁座面に当接される円形部材と、前記円形部材を周方向に回転可能に保持する弁体本体部と、を有していることを特徴とする請求項５に記載の流路切換弁。     The valve seat surface has a plurality of the ports, a plurality of annular portions surrounding each of the plurality of ports, and a connecting portion connecting the annular portions,
    The connecting portion is arranged to be shifted inward or outward with respect to a virtual perfect circle passing through the centers of the plurality of annular portions,
    The said valve body has a circular member contact | abutted to the said valve seat surface, and the valve body main-body part which hold | maintains the said circular member rotatably in the circumferential direction. The flow path switching valve described.
  7. 前記弁体の回転軸方向からみて、前記円形部材を周方向に回転させた際の該円形部材の中心の軌跡は、前記仮想正円と一致していることを特徴とする請求項６の流路切換弁。 7. The flow according to claim 6, wherein a locus of the center of the circular member when the circular member is rotated in the circumferential direction as viewed from the rotation axis direction of the valve body coincides with the virtual perfect circle. Road switching valve.
  8. 　前記弁座面が、複数の前記ポート、前記複数のポートのそれぞれを囲む複数の環状部、および前記環状部同士を接続する連結部を有し、
    　前記連結部が、前記複数の環状部の中心を通る仮想楕円に沿って配置され、
    　前記弁体が、前記弁座面に当接される円形部材と、前記円形部材を周方向に回転可能に保持する弁体本体部と、を有していることを特徴とする請求項５に記載の流路切換弁。     The valve seat surface has a plurality of the ports, a plurality of annular portions surrounding each of the plurality of ports, and a connecting portion connecting the annular portions,
    The connecting portion is disposed along a virtual ellipse passing through the centers of the plurality of annular portions;
    The said valve body has a circular member contact | abutted to the said valve seat surface, and the valve body main-body part which hold | maintains the said circular member rotatably in the circumferential direction. The flow path switching valve described.
PCT/JP2019/019477 2018-06-04 2019-05-16 Flow passage switching valve WO2019235159A1 (en)

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