JP2016023788A - Flow channel switching valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow channel switching valve that can secure sealing property by a simple configuration without using a seal material.SOLUTION: The flow channel switching valve 1 includes: a valve body 21 provided with a first flow channel 23 and a second flow channel 24; a valve main body 10 provided with a valve chamber 11 storing the valve body therein so as to be rotatable, an inflow port 12 opened toward a radial direction from the valve chamber 11 and a first outflow port 13, and a second outflow port 14 opened toward a rotation axis direction from the valve chamber; and a rotary driving device 30 for rotating the valve body inside the valve chamber 11 about the rotation axis. The flow channel switching valve selectively communicates the inflow port 12 with the first outflow port 13 via the first flow channel 23 by the rotation of the valve body 21 and the inflow port 12 with the second outflow port 14 via the second flow channel 24. The second flow channel 24 includes a slope 24a inclined relative to the rotation axis.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a flow path switching valve, and relates to a flow path switching valve excellent in sealing performance used for, for example, hot water supply equipment.

  Conventionally, a hot water supply system that supplies hot water at a required temperature obtained by adjusting the mixing ratio of water and hot water to a necessary location is known. In such a hot water supply system, for example, a hot water supply facility having a freeze prevention function that operates when the outside air temperature decreases is applied in order to cope with use in a cold region.

  As an example of the hot water supply equipment as described above, as shown in FIG. 8, the hot water storage tank A, the heat source part (heat pump) B and the heat exchange part C, and the water in the lower part of the hot water storage tank A are passed through the heat exchange part C. Three-way switching to the circulation pump D and the circulation water channel E that supply to the upper part and the hot water after heat exchange to the hot water storage side water channel F connected to the upper part of the hot water storage tank A or the bypass side water channel G connected to the lower part of the hot water storage tank A And a three-way valve H according to the temperature of the fluid (hot water or water flowing between the heat exchanging part C and the three-way valve H in the circulating water channel E or hot water or water flowing through the bypass-side water channel G). What switches to the hot water storage side water channel F or the bypass side water channel G is mentioned.

  By the way, as described in Patent Document 1, as a flow path switching valve such as a three-way valve employed in this type of hot water supply equipment, a tubular valve housing and a valve housing were rotatably accommodated. A valve body and a stepping motor for rotationally driving the valve body, and a bottom port and a plurality of side ports are formed in the valve housing, and the valve body is rotated with the rotation. It is known that one or a plurality of communication flow paths are formed so that the ports can be selectively opened and closed, and a sealing material is interposed between the valve housing and the valve body. Yes.

JP 2010-261564 A

  However, in the flow path switching valve as described above, when fluid (warm water) is flowed into the valve body and the valve housing, the pressure in the valve body and the valve housing becomes higher than the outside air, whereas the flow path switching valve is provided above the valve body. The inside of the motor case in which the motor for driving the valve body is arranged has a pressure equivalent to that of the outside air. Therefore, the valve body is attached to the motor case side so that the pressure difference causes the top surface portion (upper surface portion) of the valve body to be pressed against the upper lid member (upper valve body seat) attached to the upper end portion of the valve housing. Therefore, there is a possibility that the sealing performance other than the top surface portion of the valve body may be deteriorated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a flow path switching valve that can ensure sealing performance with a simple configuration without using a sealing material or the like. There is to do.

  In order to solve the above-described problems, a flow path switching valve according to the present invention includes a valve body provided with a first flow path and a second flow path, a valve chamber in which the valve body is rotatably accommodated, A valve body provided with an inflow port and a first outflow port that open in a radial direction from the valve chamber; a second outflow port that opens from the valve chamber in a direction of a rotation axis; and the valve in the valve chamber A rotation drive device for rotating the body around a rotation axis, and the rotation of the valve body between the inflow port and the first outflow port and the second through the first flow path. A flow path switching valve for selectively communicating between the inflow port and the second outflow port via a flow path, wherein the second flow path has an inclined surface inclined with respect to the rotation axis. It is characterized by that.

  In a preferred embodiment, the width of the opening of the second flow path on the peripheral side surface of the valve body in the rotational axis direction is equal to or larger than the diameter of the inflow port.

  In a more preferred form, the inflow port and the first outflow port are provided on opposite sides with respect to the rotation axis, and the first flow path is linear.

  In a more preferred embodiment, the channel cross section of the first channel is triangular or circular.

  In a further preferred form, the cross section of the first flow path is circular, and the flow path diameter of the first flow path is equal to or larger than the diameter of the inflow port or the first outflow port.

  In a further preferred form, the rotation drive device is disposed on the opposite side of the valve body from the second outflow port side.

  According to the flow path switching valve of the present invention, the second flow path that communicates between the inflow port and the second outflow port has an inclined surface that is inclined with respect to the rotation axis. When the port and the second outflow port communicate with each other, the fluid flows smoothly from the inflow port to the second outflow port, and the valve body opens in the radial direction by the pressing force of the fluid against the inclined surface. Since it adheres closely to 1 outflow port, the sealing performance around the valve body can be secured without using a separate sealing material, and fluid leakage to the first outflow port can be effectively suppressed.

  Further, when the width of the opening of the second flow path on the peripheral side surface of the valve body is equal to or larger than the diameter of the inflow port, a cross section of the second flow path can be secured. The fluid flow when the inflow port and the second outflow port are communicated with each other via the second flow path can be smoothed.

  Furthermore, the flow passage cross section of the first flow passage is circular, and the flow passage diameter of the first flow passage is equal to or larger than the diameter of the inflow port or the first outflow port. Thus, the fluid flow when the inflow port and the first outflow port communicate with each other can be smoothed.

It is a perspective view which cuts and shows a part of embodiment of a channel change valve concerning the present invention, and is a figure showing the 1st flow state. The longitudinal cross-sectional view of the flow-path switching valve shown in FIG. It is a perspective view which cuts and shows a part of embodiment of a channel change valve concerning the present invention, and is a figure showing the 2nd flow state. The longitudinal cross-sectional view of the flow-path switching valve shown in FIG. It is the perspective view of a rotary valve, Comprising: (a) is the perspective view seen from the right front, (b) is the perspective view seen from the left front. It is a longitudinal cross-sectional view of the flow-path switching valve shown in FIG. 3, Comprising: The figure which shows the state (3rd flow state) in which the 1st outflow port side became higher pressure than the 2nd outflow port side. It is a perspective view of other examples of a rotary valve, (a) is a perspective view seen from the right front, (b) is a perspective view seen from the left front, (c) is a longitudinal section of Drawing 7 (b). The figure which shows an example of a hot-water supply equipment.

  Hereinafter, an embodiment of a flow path switching valve according to the present invention will be described with reference to the drawings.

  1 and 3 are perspective views showing a part of the embodiment of the flow path switching valve according to the present invention by cutting and showing a first flow state and a second flow state, respectively. 4 is a longitudinal sectional view of the flow path switching valve shown in FIGS. The illustrated flow path switching valve 1 is used as a switching valve for switching each flow path, for example, in a hot water supply facility that supplies heated water (hot water) to the upper or lower portion of a hot water storage tank. In addition, in this specification, the description showing the up / down, left / right, and front / rear directions is based on the directional arrow display shown in FIGS. 1 to 4 and 6 and does not necessarily indicate the position or direction in the actual use state. It is not a thing.

  The flow path switching valve 1 shown in the figure is mainly a resin rotary having a valve body 10 having a valve chamber 11, a valve body 21 rotatably accommodated in the valve chamber 11, and a rotation transmission shaft 25. A valve 20 and a motor 30 as a rotation driving device for rotating the rotary valve 20 around the rotation axis are provided.

  The valve body 10 is provided with a valve chamber 11 formed of a cylindrical space in a lateral direction (left and right in the illustrated example) inside, and an axial center L (a rotational axis of the rotary valve 20 coincides with the peripheral wall portion 10a). Inflow port 12 and first outflow port 13 that open in a radial direction (downward and upward in the illustrated example) at positions opposite to each other (ie, at an angular interval of 180 degrees), and an axis A second outflow port 14 opening toward the center L direction (right side in the illustrated example) is provided. In addition, tubular joints 12A, 13A, and 14A are provided integrally with the valve body 10 on the outside of the inflow port 12, the first outflow port 13, and the second outflow port 14, respectively.

  Further, a stepped hole 15 into which the rotation transmission shaft 25 of the rotary valve 20 is rotatably inserted penetrates the peripheral wall portion 10a at a position opposite to the second outflow port 14 (left side in the illustrated example). The projecting portion 16 that extends from the peripheral wall portion 10a to the motor 30 side (left side in the illustrated example) has an insertion port 17a into which a holding clip 26 that holds the rotation transmission shaft 25 is inserted. A fitting insertion hole 17 having a shape is formed.

  Further, an annular step portion 18 is provided on the wall surface 14a of the second outflow port 14 (a portion close to the inflow port 12 and the first outflow port 13) so as to increase in diameter radially outward. . The small diameter portion 14aa on the left end side of the wall surface 14a of the second outflow port 14 is designed to have the same diameter as the valve body 21 accommodated in the valve chamber 11 and comes into sliding contact with the peripheral side surface of the valve body 21. ing.

  The valve element 21 of the rotary valve 20 accommodated in the valve chamber 11 has a substantially cylindrical shape having the same diameter as the distance between the inflow port 12 and the first outflow port 13 and an end portion thereof (in the illustrated example, The right end portion) extends in the direction of the axial center L to the step portion 18 provided on the wall surface 14a of the second outflow port 14, and an annular flange projecting in the radial direction on the peripheral side surface of the end portion A portion 22 is projected. The outer diameter of the flange portion 22 is designed to be smaller than the diameter of the second outflow port 14, and the outer peripheral surface of the flange portion 22 and the large-diameter portion 14ab of the wall surface 14a of the second outflow port 14 are arranged apart from each other. ing. Further, the distance between the left side surface of the flange portion 22 and the left side surface of the valve body 21 is designed to be smaller than the distance between the left side surface of the valve chamber 11 and the right side surface which is the step surface of the step portion 18. When the body 21 is disposed in the valve chamber 11, the left side surface of the flange portion 22 is in contact with the right side surface (step surface) of the step portion 18 with the left side surface of the valve body 21 being separated from the left side surface of the valve chamber 11. It comes to contact.

  In addition, in the valve body 21, a first flow path 23 that communicates between the inflow port 12 and the first outflow port 13, and a second flow that communicates between the inflow port 12 and the second outflow port 14. A path 24 is provided. The first flow path 23 is linearly penetrated in the radial direction (that is, the direction orthogonal to the axis L) so that the cross section of the flow path has a substantially right-angled isosceles triangle shape (see FIG. 4). . Further, the second flow path 24 is penetrated in a direction inclined by about 45 degrees with respect to the axis L so that the cross section of the flow path has a substantially rectangular shape. And the openings 24b and 24c on the peripheral side surface and the right end surface of the valve body 21 have a substantially rectangular shape. Here, the penetrating direction of the first flow path 23 and the penetrating direction of the second flow path 24 are orthogonal to each other due to the twisted positional relationship, and the opening 24b on the peripheral side surface of the valve body 21 of the second flow path 24 is The first flow path 23 is provided at an angular interval of 90 degrees from the opening on the peripheral side surface of the valve body 21 of the first flow path 23, and when the rotary valve 20 is rotated about the axis L by about 90 degrees, the first flow path 23 and the second flow path 24 are switched. Further, in order to secure a flow path cross section of the second flow path 24, the width in the left-right direction (axial center L direction) of the opening 24b on the peripheral side surface of the valve body 21 of the second flow path 24 is the same as that of the inflow port 12. It is designed to be substantially the same as the diameter of the outflow port 13 (see FIG. 4). If the width in the left-right direction (axial center L direction) is larger than the diameters of the inflow port 12 and the first outflow port 13, the inflow port 12 and the second outflow port 14 are connected via the second flow path 24. It is possible to further smooth the flow of fluid when communicating between the two.

  A rotation transmission shaft 25 that transmits the rotation of the rotor 31 of the motor 30 to the valve body 21 projects toward the motor 30 and along the axis L at the center of the left end portion of the valve body 21. . The rotation transmission shaft 25 is rotatably inserted into the stepped hole 15 of the peripheral wall portion 10a, and the right end portion thereof is between the peripheral side surface of the rotation transmission shaft 25 and the inner side surface of the stepped hole 15. An O-ring 27 is mounted for sealing, and a serration shaft portion 28 (see FIG. 5) that meshes with the rotor 31 of the motor 30 is provided at the left end portion thereof.

  Further, an annular engagement groove 29 with which the holding clip 26 is engaged is formed in a portion between the O-ring 27 and the serration shaft portion 28 of the rotation transmission shaft 25. The width in the left-right direction of the engagement groove 29 is designed to be larger than the thickness in the left-right direction of the holding clip 26 so that the holding clip 26 can be fitted in the engagement groove 29 with play. The rotary valve 20 is movable in the direction of the axis L with respect to the valve body 10. That is, the valve body 21 and the rotation transmission shaft 25 constituting the rotary valve 20 are movable in the axial center L direction within the valve chamber 11 and the stepped hole 15 of the valve body 10.

  The rotary valve 20 is inserted into the valve main body 10 through the tubular joint 14A and the second outlet port 14 along the axis L with the O-ring 27 attached to the right end of the rotation transmission shaft 25, and the valve body. 21. Insert the substantially U-shaped holding clip 26 into the insertion hole 17 and rotate with the left side surface of the flange portion 22 provided in the 21 in contact with the right side surface of the step portion 18 provided in the valve body 10. Engage with the engaging groove 29 of the transmission shaft 25. As a result, the rotary valve 20 is disposed so as to be rotatable around the axis L with respect to the valve body 10 and is disposed so as to be movable in the direction of the axis L.

  The motor 30 covers the protruding portion 16 of the valve body 10 and the serration shaft portion 28 of the rotary valve 20 protruding from the protruding portion 16, and the rotor 31 of the motor 30 is engaged with the serration shaft portion 28. Thus, the motor case 32 is integrally fixed to the valve main body 10 by, for example, a fastening screw (not shown), and the driving force of the motor 30 is transmitted to the valve body 21. The engagement between the rotor 31 of the motor 30 and the rotation transmission shaft 25 may be performed by a method other than the serration shaft portion 28.

  In the flow path switching valve 1 having such a configuration, as shown in FIGS. 1 and 2, the fluid flows in a state where the inflow port 12 and the first outflow port 13 communicate with each other via the first flow path 23 of the valve body 21. (The first flow state), the inside of the valve body 21 and the inside of the valve body 10 becomes higher than the outside air, and the second outflow port 14 side becomes equal to or higher than the inside of the valve body 21. The valve body 21 is urged to the motor case 32 side (left side in the illustrated example) by the pressure difference between the valve body 10 and the motor case 32 and the pressure difference between the second outflow port 14 side and the valve body 21. The left side surface of the flange portion 22 of the body 21 is in close contact with the right side surface of the step portion 18 of the valve body 10. Therefore, the sealing performance on the second outflow port 14 side can be secured, and fluid leakage to the second outflow port 14 can be suppressed.

  Further, the rotary valve 20 is rotated about the axis L by about 90 degrees (clockwise as viewed from the left) by the motor 30, and flows in through the second flow path 24 as shown in FIGS. When a fluid is flowed in a state where the port 12 and the second outflow port 14 communicate with each other (second flow state), the inside of the valve body 21 and the inside of the valve body 10 become higher than the outside air, and the fluid flows into the second flow path 24. The pressure difference between the inner surface of the valve body 21 and the valve body 10 and the motor case 32 and the fluid with respect to the inclined surface 24a are brought into contact with the inclined surface 24a facing the inflow port 12 side and guided to the second outflow port 14 side. Due to the pressing force, the valve body 21 is biased toward the motor case 32 (left side in the illustrated example), and the left side surface of the flange portion 22 of the valve body 21 is brought into close contact with the right side surface of the step portion 18 of the valve body 10. Further, in the second flow state, the valve body 21 is pressed against the first outflow port 13 side (upper side in the illustrated example) by the pressing force of the fluid against the inclined surface 24a, and the peripheral side surface of the valve body 21 is the first side surface. Close contact with the outflow port 13. Therefore, the sealing performance on the second outflow port 14 side and the first outflow port 13 side can be secured, and fluid leakage to the first outflow port 13 can be suppressed.

  Further, in the flow path switching valve 1 configured as described above, the first outflow port 13 side has a higher pressure than the second outflow port 14 side due to freezing of fluid on the tubular joint 13A side provided in the first outflow port 13. In particular, when the fluid flows in a state where the inflow port 12 and the first outflow port 13 are in communication with each other and the first outflow port 13 side becomes higher in pressure than the second outflow port 14 side, as shown in FIG. Due to the difference, the valve body 21 is urged toward the second outflow port 14 (right side in the illustrated example), and the left side surface of the flange portion 22 of the valve body 21 is separated from the right side surface of the stepped portion 18 of the valve body 10. Therefore, the pressure on the second outflow port 13 side is released to the first outflow port 14 side through the gap S formed between the flange portion 22 and the stepped portion 18 (third flow state), and the flow path Damage to the switching valve 1 can be suppressed.

  Thus, in the present embodiment, the second flow path 24 that communicates between the inflow port 12 and the second outflow port 14 is formed in a direction inclined with respect to the axis L, and By having the inclined surface 24 a that is inclined, when the inflow port 12 and the second outflow port 14 are communicated with each other via the second flow path 24, the inflow port 12 to the second outflow port 14. While the fluid flows smoothly, the valve body 21 is brought into close contact with the first outlet port 13 opened in the radial direction by the pressing force of the fluid against the inclined surface 24a, so that the sealing performance around the valve body 21 can be secured, The fluid leakage to the 1 outflow port 13 can be effectively suppressed.

  In the embodiment described above, the flow passage cross section of the first flow passage 23 has a substantially triangular shape in order to ensure the flow passage cross section of the second flow passage 24 in the valve body 21. The channel cross section may be a polygonal shape such as a square shape, a circular shape or an elliptical shape. For example, as shown in FIG. 7, when the cross section of the first flow path 23A is circular, the second flow path 24A is arranged on the inner side to avoid interference with the first flow path 23A. What is necessary is just to comprise from the horizontal surface 24bA parallel to the axial center L which comprises the recessed part dented in, and the inclined surface 24aA inclined with respect to the axial center L. By having the horizontal plane 24bA parallel to the axis L, in the second flow state, the horizontal plane 24bA is disposed substantially perpendicular to the flow direction of the fluid flowing in from the inflow port 12, and the fluid is pushed against the horizontal plane 24bA. Due to the pressure, the valve body 21 </ b> A is strongly pressed to the first outflow port 13 side, and the peripheral side surface of the valve body 21 </ b> A is tightly brought into close contact with the first outflow port 13. In addition, when the flow passage section of the first flow passage 23A is circular, the flow passage diameter is designed to be the same as or larger than the diameter of the inflow port or the first outflow port. The flow can be smoothed.

  In the above embodiment, in order to simplify the configuration, the inflow port 12 and the first outflow port 13 are provided on the opposite side with respect to the axis L, and the first flow path 23 is linear. However, if the inflow port 12 and the first outflow port 13 are provided in the circumferential direction of the valve chamber 11, the positional relationship between the inflow port 12 and the first outflow port 13 can be appropriately changed.

  Further, in the above-described embodiment, the stepped portion 18 that expands radially outward is provided on the wall surface 14 a of the second outflow port 14 in order to improve the sealing performance, and the valve body 21 is provided with the stepped portion 18 of the second outflow port 14. The flange portion 22 that abuts against the stepped portion 18 protrudes from the peripheral side surface of the valve body 21, but the stepped portion 18 and the flange portion 22 may be omitted. Further, in order to reduce the size of the flow path switching valve 1 and to reduce the number of parts and the number of assembling steps, a flange portion 22 is integrally provided at the end of the valve body 21 on the second outflow port 14 side. However, the flange portion 22 may be formed at a place other than the end portion on the second outflow port 14 side, or the flange portion 22 may be formed separately from the valve body 21.

  In the above-described embodiment, the valve body 21 of the rotary valve 20 is made of resin. However, the material for forming the valve body 21 can be appropriately selected, and may be made of metal, for example.

  In the above-described embodiment, the rotary valve 20 is held with respect to the valve main body 10 using the substantially U-shaped holding clip 26. However, the holding means of the rotary valve 20 with respect to the valve main body 10 can be appropriately selected. it can.

  In the above-described embodiment, the inflow port 12 is disposed below, the first outflow port 13 is disposed above, and the second outflow port 14 is disposed on the right side. The posture during use can be selected as appropriate. For example, the inflow port 12 and the first outflow port 13 may be disposed in the left-right direction, and the second outflow port 14 may be disposed below.

  Moreover, the flow path switching valve 1 of the above-described form is employed as a flow path switching device in various devices such as a flow path switching valve that switches a flow path of a fluid flowing in an engine room of an automobile or the like in addition to the hot water supply equipment described above. It is natural that we can do it.

DESCRIPTION OF SYMBOLS 1 Flow path switching valve 10 Valve body 10a Perimeter wall part 11 Valve chamber 12 Inflow port 13 1st outflow port 14 2nd outflow port 14a Wall surface 14aa of 2nd outflow port Small diameter part 14ab of wall surface Large diameter part 15 of wall surface Stepped hole 17 Insertion hole 17a Insertion port 18 Step part 20 Rotary valve 21 Valve body 22 Flange part 23 First flow path 24 Second flow path 24a Inclined surface 25 Rotation transmission shaft 26 Holding clip 27 O-ring 28 Serration shaft part 29 Engaging groove 30 Motor (rotary drive device)
L axis (rotation axis)

Claims (6)

A valve body provided with a first flow path and a second flow path;
A valve chamber in which the valve body is rotatably accommodated, an inflow port and a first outflow port that open in the radial direction from the valve chamber, and a second outflow port that opens in the direction of the rotation axis from the valve chamber A valve body provided with
A rotation drive device for rotating the valve body around a rotation axis in the valve chamber,
Selection of between the inflow port and the first outflow port through the first flow path and between the inflow port and the second outflow port through the second flow path by the rotation of the valve body A flow path switching valve that communicates with each other,
The flow path switching valve, wherein the second flow path has an inclined surface inclined with respect to the rotation axis.   2. The flow path switching valve according to claim 1, wherein the width of the opening of the second flow path in the circumferential side surface of the valve body is greater than or equal to the diameter of the inflow port.   3. The flow path switching valve according to claim 1, wherein the inflow port and the first outflow port are provided on opposite sides with respect to a rotation axis, and the first flow path is linear. .   The flow path switching valve according to claim 3, wherein the cross section of the first flow path is triangular or circular.   The flow path section of the first flow path is circular, and the flow path diameter of the first flow path is equal to or larger than the diameter of the inflow port or the first outflow port. Channel switching valve.   6. The flow path switching valve according to claim 1, wherein the rotation driving device is disposed on a side opposite to the second outflow port side of the valve main body.

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