JP6656846B2 - Flow path switching valve and seal member - Google Patents

Description

  The present invention relates to a flow path switching valve and a seal member, for example, a flow path switching valve such as a three-way switching valve including a seal member as a valve sheet that suppresses leakage of fluid between a valve chamber and each outlet, And a seal member used for the same.

  FIG. 9 shows a conventional example of this kind. The illustrated flow path switching valve 1 'is used as a rotary switching valve (rotary valve) for switching a flow path of a fluid flowing in, for example, an engine room of an automobile. A valve body 10 having a chamber 11 and outlets 11a and 11b communicating with the valve chamber 11; and a seal member 30 disposed in the valve chamber 11 of the valve body 10; Inner ribs 32a to 32d and outer ribs protruding inward and outward from the inner peripheral surface and the outer peripheral surface of the cylindrical body 31 along the periphery of the cylindrical body 31 formed with the cylindrical body 31 and the openings 31a to 31d. A valve member 20 including a seal member 30 having 33a to 33d, a valve shaft 21 connected to the rotary driving device 50, and a valve body portion 22 housed in a region surrounded by the seal member 30; The valve body 22 is rotated in the valve chamber 11 by the rotation drive device 50 via the valve shaft 21, so that the valve body 22 is provided with the inner ribs 32 a to 32 d of the seal member 30. The opening and closing or switching of the outlets 11a and 11b of the valve body 10 is performed by rotating and sliding the inner peripheral side of the valve body 10 (for example, Patent Document 1).

JP-A-2005-034560

  By the way, in the conventional flow path switching valve 1 ′, two outlets 11 a and 11 b are formed at an outer peripheral portion of the valve body 10 at an angular interval of 90 degrees, and the cylindrical body 31 of the seal member 30 is equiangular. Four openings 31a to 31d are formed at intervals (90 degree intervals), and inside ribs 32a to 32d are protruded inward around each of the openings 31a to 31d. Two communication ports 22a and 22b are formed at 90 degree intervals. By rotating the valve body portion 22 of the valve body 20 by about 270 degrees in the valve chamber 11 by the rotation driving device 50, the two outlets 11a and 11b formed in the valve body 10 are opened. The four open / close modes of "open", "open-close", "close-open", and "close-close" are set (that is, flow path switching is performed).

  Therefore, in the above-described conventional flow path switching valve 1 ′, when switching the flow path by rotating the valve element, the valve element portion of the valve element slides with the inner rib provided around the four openings of the seal member. As a result, there is a problem that a large torque is required for switching the flow path, resulting in an increase in the size of the rotary drive device.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the number of openings formed in a seal member and inner ribs provided around the openings to the minimum necessary to switch the flow path. It is another object of the present invention to provide a flow path switching valve and a seal member capable of reducing the torque required for the above-mentioned steps and ensuring that four open / close modes can be set for two outlets formed in the valve body.

In order to solve the above problems, a flow path switching valve according to the present invention has a valve body formed therein, and a valve body having a cylindrical body provided with two outflow ports on an outer peripheral portion, A valve body having a cylindrical valve body portion formed with two communication ports in the circumferential direction and rotatably arranged in the valve chamber, a rotation driving device for rotating the valve body, A cylindrical seal member interposed between a cylindrical body of the valve body and a cylindrical valve body of the valve body to suppress leakage of fluid between the outlet, By rotating the cylindrical valve body portion of the valve body in the valve chamber by the rotation drive device, the cylindrical valve body portion is slidably rotated on the inner peripheral side of the seal member, and the flow of the valve body is reduced. A flow path switching valve configured to open / close or switch an outlet, wherein the seal member has a circumferential direction. Lumpur two openings communicating with said two outlet to the asymmetrical position with respect to the central axis of the member is formed, with the inner ribs for sealing inward into the openings around is projected, before serial on the side corner is larger formed by the previous SL two openings of the seal member, the seal inner projection the sealing member supporting the cylindrical valve body portion with the inner rib of the valve body which is Zaisa distribution inside the member The inner projection of the inner projection is provided with a wide portion that extends in the circumferential direction along the outer periphery of the cylindrical valve body portion of the valve body. I have. In a preferred aspect, the inner projection is formed toward a center axis direction of the seal member. Further, a flow path switching valve according to the present invention has a valve body formed therein, a valve body having a cylindrical body portion provided with two outflow ports on an outer peripheral portion, and two communication ports in a circumferential direction. And a valve body having a cylindrical valve body portion rotatably disposed in the valve chamber, a rotation drive device for rotating the valve body, and a fluid between the valve chamber and each of the outlets. A cylindrical seal member interposed between a cylindrical body of the valve body and a cylindrical valve body of the valve body to suppress leakage of the valve body, and the valve chamber is rotated by the rotation drive device. By rotating the cylindrical valve body of the valve body, the cylindrical valve body rotates and slides on the inner peripheral side of the seal member to open or close or switch the outflow port of the valve body. A flow path switching valve configured as described above, wherein the seal member has a circumferential direction that is opposite to a central axis of the seal member. Two openings communicating with the two outlets are formed at positions that are asymmetrical with each other, an inner rib for sealing is projected inwardly around each opening, and the two A support portion for supporting the cylindrical valve body portion of the valve body disposed inside the seal member together with the inner rib is provided on a side where the angle formed by the opening is large.

The support portion is preferably composed of a protrusion which projects inward through the split groove provided in the sealing member from said cylindrical body portion of the valve body.

In a preferred aspect, a wide portion is provided at the inner end of the ridge so as to expand in the circumferential direction along the outer periphery of the cylindrical valve body portion of the valve body.

In another preferred aspect, the split groove and the ridge are formed toward a center axis direction of the seal member.

  In another preferred aspect, an outer projection is provided to project outward from the seal member on the side of the seal member where the angle formed by the two openings is larger.

  In a further preferred aspect, a concave groove in which the outer projection is fitted is provided in the cylindrical body of the valve body.

  In another preferred aspect, an outer rib for sealing is projected outwardly around each opening in the seal member, and the outer rib is fitted around each outlet in the cylindrical body of the valve body. An annular recess is provided.

  The sealing member is preferably formed symmetrically in the up-down direction.

Further, the seal member according to the present invention is a cylindrical seal member in which two openings are formed in a circumferential direction, and an inner rib for sealing is projected around each opening inward. The opening is formed at a position that is asymmetrical with respect to the central axis of the seal member in the circumferential direction, and the valve body disposed inside the seal member is located on the side where the angle formed by the two openings is large. the valve the valve element of ridges for supporting with the inner rib is Zaisa distribution inside the separation grooves or the sealing member is inserted into Rutotomoni its inner end projecting inward in order to support together with the inner rib An inner projection provided with a wide portion extending in the circumferential direction along the outer periphery of the body is formed.

  According to the present invention, the cylindrical seal member interposed in a compressed state between the cylindrical body portion of the valve body and the cylindrical valve body portion of the valve body, and the center axis of the seal member in the circumferential direction. Two openings are formed at positions that are asymmetrical with respect to the two outlets formed in the valve body, and inner ribs for sealing are protruded inwardly around each opening, and the valve body is formed. Alternatively, a supporting portion that supports the cylindrical valve body portion of the valve body disposed inside the sealing member together with the inner rib is provided on the side of the sealing member where the angle between the two openings is large. The opening formed in the sealing member and the inner rib provided around the opening can be reduced to the minimum necessary to reduce the torque required for switching the flow path, and the cylindrical valve body of the valve body is disposed at the center of the sealing member. 2 formed on the valve body. It is possible to reliably assume a four-off mode for the outlet.

  Here, when the support portion is formed of a ridge protruding inward from a cylindrical body portion of the valve body via a split groove provided on the seal member, the split groove of the seal member is provided. The positioning of the seal member with respect to the valve body (assembly) is facilitated by the ridges of the valve body, and the rotation of the valve member (the cylindrical valve portion thereof) causes the rotation of the seal member and the end of the seal member. The effect of preventing turning over can also be obtained. Further, by providing the seal member with the split groove, an effect that a simple mold structure can be obtained as compared with a cylindrical seal member having no split groove can be obtained. Further, when the support portion is formed of an inner protrusion protruding inward from the seal member, an effect that the entire configuration of the flow path switching valve can be simplified can be obtained.

1 is a longitudinal sectional view showing a basic configuration of an embodiment of a flow path switching valve according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a state in an open-open mode. FIG. 2 is a perspective view showing the valve body shown in FIG. 1. FIG. 2 is a perspective view showing the seal member (the seal member according to the present invention) shown in FIG. 1. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a state in a closed-closed mode. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a state in an open-close mode. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, showing a state in a closed-open mode. FIG. 2 is a perspective view showing another example of the seal member shown in FIG. 1. It is a figure which shows the conventional flow-path switching valve, (A) is a longitudinal cross-sectional view, (B) is XX arrow sectional drawing of (A).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing a basic configuration of an embodiment of a flow path switching valve according to the present invention. FIG. 2 is a sectional view taken along line AA of FIG. It is a figure showing a state.

  The flow path switching valve 1 of the illustrated embodiment is used as a three-way switching valve that switches a flow path of a fluid flowing in, for example, an engine room of an automobile in multiple directions, and is basically made of a resin having a valve chamber 11. , A motor (rotational driving device) 50 disposed above the valve body 10, a seal member 30 as a valve seat disposed in the valve chamber 11 of the valve body 10, and an output shaft of the motor 50. And a resin valve body 20 comprising a cylindrical valve body portion 22 with a ceiling portion 23 housed in a region surrounded by the seal member 30.

  The valve body 10 includes a stepped cylindrical base 12 and a lower port member 15. The cylindrical base 12 has a valve chamber 11 formed therein and an outer peripheral portion formed in the valve chamber 11. The two outlets 11a and 11b that are opened are formed at predetermined angular intervals (positions that are asymmetric with respect to the central axis O of the cylindrical base 12, and in the illustrated example, at an angular interval of 145 degrees). The cylindrical body 13 with a ceiling portion 13a integrally formed with outflow ports p1 and p2 formed of joints so as to communicate with the outflow ports 11a and 11b, and the cylindrical body for inserting a valve shaft 21 of a valve body 20. And a cylindrical fitting portion 14 having a diameter smaller than that of the cylindrical body portion 13 protruding from a ceiling portion 13a of the cylindrical body portion 13. A lower port member 15 having an inflow port p3 formed of a joint is internally fitted and fixed to the lower opening of the cylindrical body 13 by ultrasonic welding, press fitting, caulking, screws, or the like. A vertical inlet 11c that opens is formed.

  Further, two of the outer peripheral portions of the cylindrical body 13 in the cylindrical base 12 formed at positions that are asymmetric with respect to the central axis O (the central axis O common to the seal member 30 and the valve body 20). At the center on the side where the angles formed by the outlets 11a and 11b are larger, a ridge 19 inserted into a split groove 39 of the seal member 30 described later projects inward. The ridge 19 is provided along the vertical direction (the direction of the central axis O), and the cylindrical valve element of the valve element 20 disposed inside the seal member 30 via the split groove 39 of the seal member 30. The protruding ridge 19 has an inner end on which wear due to rotation of the valve element 20 (the cylindrical valve element part 22 thereof), co-rotation of the seal member 30, turning-up of the end of the seal member 30, and the like. In order to suppress this, a wide portion 18 that extends in the circumferential direction along the outer periphery of the cylindrical valve body portion 22 of the valve body 20 is provided.

  In the illustrated example, annular recesses 17a and 17b into which outer ribs 33a and 33b of a seal member 30 described later are fitted are provided around the outlets 11a and 11b in the cylindrical body 13, respectively.

  As is well understood by referring to FIG. 3 together with FIGS. 1 and 2, the valve body 20 is configured such that two oblong communication ports 22 a and 22 b in a circumferential direction have a predetermined angular interval (145 degrees in the illustrated example). A cylindrical valve body portion 22 formed at an interval (angular interval) and rotatably disposed in the valve chamber 11 (in other words, the cylindrical body portion 13), and a ceiling portion of the cylindrical valve body portion 22 And a valve shaft 21 protruding from the valve shaft 23. The valve shaft 21 has an intermediate shaft portion 21a that is rotatably fitted into the cylindrical fitting portion 14 and has a smaller diameter than the cylindrical valve body portion 22, and protrudes from the intermediate shaft portion 21a. An O-ring as a seal member is provided between the intermediate shaft portion 21a and the inner peripheral surface of the cylindrical fitting portion 14 which is composed of an upper shaft portion 21b having an oval shape in plan view and connected to the output shaft 50. 24 are interposed in two stages. Further, in the illustrated example, between the (top surface of) the ceiling portion 23 of the cylindrical valve body portion 22 and (the lower surface of) the ceiling portion 13a of the cylindrical body portion 13 (in other words, the ceiling portion of the cylindrical valve body portion 22). In order to reduce the sliding resistance of the ceiling portion 23 of the cylindrical valve body portion 22 with respect to the valve body 10 at the time of switching the flow path (when the valve body 20 is rotating), PTFE or the like is used. The manufactured annular sheet member 25 for sliding is interposed.

  The seal member 30 is made of an elastic material such as rubber so as to be vertically symmetrical. As is well understood by referring to FIG. 4 together with FIGS. Cylindrical bodies 31 formed with two elliptical openings 31a and 31b at predetermined angular intervals (positions that are asymmetrical with respect to the central axis O of the seal member 30, and in the illustrated example, at an angular interval of 145 degrees). And inner ribs 32a, 32b for sealing and outer ribs 33a, 33b protruding inward and outward around each opening 31a, 31b of the cylindrical body 31. In the center of the cylindrical body 31 on the side where the angle formed by the two openings 31a and 31b is large, the vertical direction (the direction of the center axis O of the seal member 30) and the vertical A split groove 39 is formed in the direction. The cylindrical seal member 30 is provided along the outer periphery of the valve chamber 11 in detail, in order to suppress leakage of fluid between the valve chamber 11 and each of the outlets 11a and 11b. ) The upper end abuts against the ceiling 13a of the cylindrical body 13 of the valve body 10, the lower end thereof (of the cylindrical body 31) abuts the lower port member 15 of the valve body 10, and the inner ribs 32a, 32b. The inner peripheral side abuts against the cylindrical valve body portion 22 of the valve body 20, and the outer ribs 33a, 33b (the outer peripheral side) abuts against the outer peripheral portion of the cylindrical body portion 13 of the valve body 10, and each outlet 11a. , 11b are fitted into the annular recesses 17a, 17b, and the projection 19 of the valve body 10 is inserted into the split groove 39 so that the cylindrical body 13 of the valve body 10 and the valve body are inserted. It is interposed in a compressed state with the cylindrical valve body portion 20 of FIG.

  In assembling the above-described flow path switching valve 1, before the lower port member 15 is fitted and fixed to the cylindrical body 13 of the cylindrical base 12, a protrusion formed on the cylindrical body 13 from below the lower port member 15. The seal member 30 is slightly press-fitted into the cylindrical body 13 of the cylindrical base 12 so that the split groove 39 is inserted through the ridge 19. Thereby, each opening 31a, 31b formed in (the cylindrical body 31) of the seal member 30 is always in communication with each of the outlets 11a, 11b formed in the (cylindrical body 13 of) the valve body 10 so that The seal member 30 is positioned and arranged with respect to the valve body 10, and the rotation of the seal member 30 due to the rotation of the (the cylindrical valve body portion 22) of the valve body 20 is prevented. Next, from the lower side, the annular seat member 25 is disposed on the upper surface of the ceiling portion 23 of the cylindrical valve body portion 22, and the valve body 20 having the O-ring 24 attached to the intermediate shaft portion 21a is slightly press-fitted. insert. Thereby, on the inner peripheral side of (the inner ribs 32a, 32b) of the seal member 30, the cylindrical valve body portion 22 of the valve body 20 is connected to the inner ribs 32a, 32b and the ridge 19 (the wide portion 18). In a state where the seal member 30 is supported from the surroundings, the seal member 30 is compressed and slidably inserted while compressing the seal member 30 to such an extent that a necessary compression margin for sealing with the seal member 30 can be secured. Then, the lower port member 15 is internally fixed to the lower opening of the cylindrical body 13 of the cylindrical base 12, and the motor 50 is mounted above the cylindrical base 12.

  Next, the flow path switching operation of the flow path switching valve 1 will be described with reference to FIGS. Here, the inflow port 11c formed in the valve body 10 is always in communication with the valve chamber 11 (via the lower opening of the cylindrical valve body portion 22 of the valve body 20), and each of the ports formed in the valve body 10 is formed. An open-open mode in which the outlets 11 a and 11 b communicate with the valve chamber 11 (via the respective openings 31 a and 31 b of the seal member 30 and the respective communication ports 22 a and 22 b of the cylindrical valve body 22 of the valve body 20); A closed-close mode in which each of the outlets 11a and 11b is closed (by the cylindrical valve body 22 of the valve body 20), and a state in which the outlet 11a is closed (by the opening 31a of the seal member 30 and the cylindrical valve body 22 of the valve body 20). The opening-closing mode in which the outlet 11b is closed (by the cylindrical valve body portion 22 of the valve body 20) and the outlet 11a is connected to the valve chamber 11 (via the communication port 22b of the valve body 20). Closed by the valve body 22 and the outlet 11b is closed Four opening / closing modes, that is, a closing-opening mode that communicates with the valve chamber 11 (via the opening 31b of the valve 30 and the communication port 22a of the cylindrical valve element portion 22 of the valve element 20) can be selectively taken. .

  First, in the state shown in FIG. 2, the communication ports 22 a and 22 b of the cylindrical valve body portion 22 of the valve body 20, the outlets 11 a and 11 b of the valve body 10, and the openings 31 a and 31 b of the seal member 30 are centered. Fluid flowing from the inflow port p3 of the lower port member 15 at the same position around the axis O is introduced into the valve chamber 11 through the inflow port 11c and the lower opening of the cylindrical valve body 22, and the fluid is introduced into the cylinder. It is guided to both outflow ports p1 and p2 through the communication ports 22a and 22b of the valve body 22, the openings 31a and 31b of the seal member 30, and the outflow ports 11a and 11b of the valve body 10 (open-open mode). .

  From the state shown in FIG. 2, when the valve body 20 is rotated by about 72.5 degrees counterclockwise as viewed from above by driving the motor 50, as shown in FIG. The communication ports 22a and 22b of the body 22 are located at the cylindrical body 31 of the seal member 30, and the outlets 11a and 11b of the valve body 10 and the openings 31a and 31b of the seal member 30 are connected to the valve body. It is closed by the 20 cylindrical valve body 22 (closed-closed mode).

  From the state shown in FIG. 5, when the valve body 20 is further rotated counterclockwise by about 72.5 degrees when viewed from above by the drive of the motor 50, as shown in FIG. The communication port 22b of the valve body portion 22 reaches substantially the same position as the opening 31a of the seal member 30 and the outlet 11a of the valve body 10, and the outlet 11a of the valve body 10 is connected to the opening 31a of the seal member 30 and the valve body 20. The valve body 11 communicates with the valve chamber 11 via the communication port 22 b of the cylindrical valve body 22, but the outlet 11 b of the valve body 10 is kept closed by the cylindrical valve body 22 of the valve body 20. Thus, the fluid flowing from the inflow port p3 of the lower port member 15 is introduced into the valve chamber 11 through the inflow port 11c and the lower opening of the cylindrical valve body 22, and the communication port of the cylindrical valve body 22 is opened. It is guided only to the outflow port p1 through the opening 22a of the seal member 30, and the outlet port 11a of the valve body 10 (open-close mode).

  When the valve body 20 is further rotated counterclockwise by about 70 degrees when viewed from above by driving the motor 50 from the state shown in FIG. 6, as shown in FIG. The communication port 22a of the portion 22 reaches substantially the same position as the opening 31b of the seal member 30 and the outlet 11b of the valve body 10, and the outlet 11b of the valve body 10 has the opening 31b of the seal member 30 and the cylindrical shape of the valve body 20. The valve body 11 communicates with the valve chamber 11 via the communication port 22 a of the valve body 22, but the outlet 11 a of the valve body 10 is closed by the cylindrical valve body 22 of the valve body 20. Thus, the fluid flowing from the inflow port p3 of the lower port member 15 is introduced into the valve chamber 11 through the inflow port 11c and the lower opening of the cylindrical valve body 22, and the communication port of the cylindrical valve body 22 is opened. It is guided only to the outflow port p2 through the opening 22b of the seal member 30, and the outlet 11b of the valve body 10 (closed-open mode).

  As described above, in the flow path switching valve 1 of the present embodiment, the opening formed in the seal member 30 and the inner ribs provided around the opening are two (the minimum number of outflow ports) required for the flow path switching. ), The torque required for switching the flow path can be reduced, and the four opening / closing modes for the two outlets 11a and 11b formed in the valve body 10 can be reliably taken. Further, the size of the motor 50 can be reduced by reducing the torque.

  In addition, by merely rotating the valve body 20 by about 215 degrees by driving the motor 50, the four outlets 11a and 11b of the valve body 10 can be set to four open / close modes. The opening and closing or switching of the two outlets 11a and 11b of the valve body 10 can be performed at a small rotation angle as compared with the flow path switching valve described above, so that the sealing member 30 (particularly, the cylindrical valve body of the valve body 20) is used. There are also advantages that the durability of the inner ribs 32a and 32b) sliding with the portion 22 can be ensured, and that the life of the motor 50 is extended.

  Furthermore, since the seal member 30 is formed vertically symmetrically, there is an advantage that the assembly of the seal member 10 to the valve body 10 is facilitated.

  In the above embodiment, the ridge 19 formed on the valve body 10 is fitted into the split groove 39 formed on the seal member 30 to engage the seal member 30 with the valve body 20, and the ridge 19 (support portion) is formed. ) Is used to support the cylindrical valve portion 22 of the valve body 20 at the inner end (specifically, the wide portion 18 provided at the inner end of the ridge 19), for example, as shown in FIG. As described above, the cylindrical body 31 of the seal member 30 is provided with the inner protrusion 38a inward along the vertical direction (the direction of the central axis O of the seal member 30) and the vertical direction of the cylindrical body 31 of the seal member 30. And the inner end of the inner projection 38a (support portion) may support the cylindrical valve body portion 22 of the valve body 20. In this case, similarly to the ridge 19 of the above-described embodiment, a wide portion may be provided at the inner end of the inner projection 38 a so as to expand in the circumferential direction along the outer periphery of the cylindrical valve body portion 22 of the valve body 20. Needless to say. In this case, as shown in FIG. 8, the cylindrical member 31 of the seal member 30 (in the illustrated example, at the same position as the inner protrusion 38a in the circumferential direction) is moved outward from the cylindrical member 31 of the seal member 30. The outer projection 38b is provided so as to project toward the outside, a concave groove (not shown) for fitting the outer projection 38b is provided in the cylindrical body portion 13 of the valve body 10, and the outer projection 38b of the seal member 30 is The seal member 30 may be engaged with the valve body 20 by being fitted into the concave groove. In the example shown in FIG. 8, the number of the inner protrusion 38a and the outer protrusion 38b is only one, but it is obvious that a plurality of (in the circumferential direction) may be provided.

  Further, in the above embodiment, the split groove 39 (see FIG. 4), the inner protrusion 38a, and the outer protrusion 38b (see FIG. 8) of the seal member 30 extend in the up-down direction and the up-down direction (center axis line) of the seal member 30. Although it is formed linearly along the O direction, the split groove 39, the inner protrusion 38a, and the outer protrusion 38b may be formed on a part of the seal member 30 in the vertical direction (in other words, the seal member 30). The height may be lower than the height of the member 30 in the vertical direction.)

  In the above-described embodiment, the two openings 31a and 31b of the seal member 30, the two communication ports 22a and 22b of the valve body 20, and the two outlets 11a and 11b of the valve body 10 are spaced at an angle of 145 degrees. Needless to say, they may be formed at positions that are asymmetrical with respect to the central axis O (that is, their angular intervals may be less than 180 degrees).

  In the above embodiment, the sealing performance between (the cylindrical body 13 of the valve body 10) and (the cylindrical valve body 22 of the valve body 20) is enhanced, and the positioning of the seal member 30 with respect to the valve body 10 is improved. In order to make the seal member 30 easy to rotate and to suppress the rotation of the seal member 30 due to the rotation of the valve body 20 (the cylindrical valve body portion 22 thereof), the seal member 30 is sealed outward around each of the openings 31a and 31b. Outer ribs 33a, 33b are protruded, and annular recesses 17a, 17b into which the outer ribs 33a, 33b are fitted are formed around the respective outlets 11a, 11b in the cylindrical body 13 of the valve body 10. Needless to say, the outer ribs 33a and 33b and the annular concave portions 17a and 17b may be omitted.

  Although not shown, a sliding resin sheet made of PTFE or the like may be attached to the inside of the seal member 30 in order to further reduce the torque at the time of switching the flow path (when the valve body 20 rotates). Good.

DESCRIPTION OF SYMBOLS 1 Flow-path switching valve 10 Valve main body 11 Valve chamber 11a, 11b Outflow port 11c Inflow port 12 Cylindrical base 13 Cylindrical body part 14 Cylindrical fitting insertion part 15 Lower port member 17a, 17b Annular concave part 18 Wide part 19 Protrusion ( Support)
Reference Signs List 20 valve body 21 valve shaft 22 cylindrical valve body 22a, 22b communication port 30 sealing member 31 cylindrical body 31a, 31b opening 32a, 32b inner rib 33a, 33b outer rib 38a inner projection (supporting part)
38b Outer projection 39 Split groove 50 Motor (Rotary driving device)
p1, p2 Outflow port p3 Inflow port

Claims (11)

A valve body is formed inside, and a valve body having a cylindrical body portion provided with two outflow ports on an outer peripheral portion, and two communication ports are formed in a circumferential direction and rotatably disposed in the valve chamber. A valve body having a cylindrical valve body portion to be rotated, a rotation drive device for rotating the valve body, and a cylindrical shape of the valve body for suppressing leakage of fluid between the valve chamber and each of the outlets. A cylindrical seal member interposed between the body and the cylindrical valve body of the valve body,
By rotating the cylindrical valve body portion of the valve body in the valve chamber by the rotation drive device, the cylindrical valve body portion is slidably rotated on the inner peripheral side of the seal member and the valve body of the valve body is rotated. A flow path switching valve adapted to open or close or switch an outlet,
In the seal member, two openings communicating with the two outlets are formed at positions that are asymmetrical with respect to the central axis of the seal member in the circumferential direction, and the inside for sealing is formed inward around each of the openings. A rib is protruded, and the cylindrical valve body portion of the valve body disposed inside the seal member is supported together with the inner rib on the side where the angle between the two openings of the seal member is large. An inner projection is provided to project inward from the seal member,
A flow path switching valve, wherein a wide portion extending in a circumferential direction is provided at an inner end of the inner projection along an outer periphery of the cylindrical valve body portion of the valve body.   The flow path switching valve according to claim 1, wherein the inner protrusion is formed toward a center axis direction of the seal member. A valve body is formed inside, and a valve body having a cylindrical body portion provided with two outflow ports on an outer peripheral portion, and two communication ports are formed in a circumferential direction and rotatably disposed in the valve chamber. A valve body having a cylindrical valve body portion to be rotated, a rotation drive device for rotating the valve body, and a cylindrical shape of the valve body for suppressing leakage of fluid between the valve chamber and each of the outlets. A cylindrical seal member interposed between the body and the cylindrical valve body of the valve body,
By rotating the cylindrical valve body portion of the valve body in the valve chamber by the rotation drive device, the cylindrical valve body portion is slidably rotated on the inner peripheral side of the seal member and the valve body of the valve body is rotated. A flow path switching valve adapted to open or close or switch an outlet,
In the seal member, two openings communicating with the two outlets are formed at positions that are asymmetrical with respect to the central axis of the seal member in the circumferential direction, and the inside for sealing is formed inward around each of the openings. A rib is projected from the valve body, and the cylindrical valve body portion of the valve body disposed inside the seal member is provided on the valve body on the side where the angle formed by the two openings is large. A flow path switching valve, comprising a support portion for supporting the flow path switching valve.   The said support part is comprised from the said cylindrical trunk | drum of the said valve main body by the protrusion which protruded inward via the split groove | channel provided in the said sealing member, The characterized by the above-mentioned. 3. The flow path switching valve according to claim 1.   The flow path switching according to claim 4, wherein a wide portion extending in a circumferential direction is provided at an inner end of the ridge so as to extend along an outer periphery of the cylindrical valve body portion of the valve body. valve.   The flow path switching valve according to claim 4, wherein the split groove and the protrusion are formed toward a center axis direction of the seal member. 3. The flow path switching valve according to claim 1, wherein an outer protrusion protrudes outward from the seal member on a side of the seal member where the angle formed by the two openings is larger. 4.   The flow path switching valve according to claim 7, wherein the cylindrical body of the valve body is provided with a concave groove into which the outer projection is fitted.   Outer ribs for sealing are projected outwardly around each opening in the seal member, and an annular recess is provided around each outlet in the cylindrical body of the valve body, in which the outer rib is fitted. The flow path switching valve according to any one of claims 1 to 8, wherein:   The flow path switching valve according to any one of claims 1 to 9, wherein the seal member is formed symmetrically up and down. A cylindrical seal member in which two openings are formed in a circumferential direction, and an inner rib for sealing is protruded inward around each opening,
The two openings are formed at positions that are asymmetric with respect to the central axis of the seal member in the circumferential direction, and are disposed inside the seal member on the side where the angle formed by the two openings is large. A split groove into which a ridge for supporting the valve body together with the inner rib is inserted or a valve body disposed inside the seal member is provided inwardly to support the valve body together with the inner rib, and an inner end thereof. A sealing member provided with an inner projection provided with a wide portion extending in the circumferential direction along the outer periphery of the valve element.

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