JP7220910B2 - Flow switching valve - Google Patents

Description

The present invention relates to a rotary flow path switching valve.

Patent Document 1 discloses a conventional rotary flow path switching valve. The flow path switching valve of Patent Document 1 is used, for example, in an air conditioner that performs cooling operation or heating operation by switching the direction of refrigerant flow. During cooling operation of the air conditioner, the refrigerant flows from the compressor through the flow switching valve, the outdoor heat exchanger, the control valve, and the indoor heat exchanger in this order, returns to the compressor through the flow switching valve, and circulates. During the heating operation of the air conditioner, the refrigerant flows from the compressor through the flow path switching valve, the indoor heat exchanger, the control valve, and the outdoor heat exchanger in this order, passes through the flow path switching valve, and returns to the compressor for circulation. .

JP-A-2002-195694

As such an air conditioner cycle system, there is a system in which a plurality of heat exchangers are installed in order to make the heat exchange capacity variable. In this system, the heat exchange capacity is made variable by switching the number of heat exchangers connected to the compressor with one flow of refrigerant discharged from the compressor or by branching into a plurality of flows. However, in such a system, a plurality of flow path switching valves are combined to branch the refrigerant, so the configuration is complicated and the size is increased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a compact flow path switching valve that can be branched into a plurality of channels with a simple configuration.

In order to achieve the above object, a flow path switching valve according to the present invention includes a valve body having a valve seat surface and a rotary valve body having a sliding surface slidably contacting the valve seat surface. The path switching valve, wherein the valve seat surface includes one inlet port arranged on the rotary shaft of the rotary valve body and four inlet ports arranged at intervals of 90 degrees on a virtual circle centered on the rotary shaft. two outlet ports are provided, and the sliding surface extends from a point corresponding to the inlet port to a point corresponding to the imaginary circle and is arranged at intervals of 90 degrees from first to fourth branch grooves; A first arcuate groove connected to the first branched groove and extending in one direction along the virtual circle; and a second arcuate groove connected to the second branched groove and extending in the one direction along the virtual circle. and are provided, and the first arcuate groove is formed in a state in which the rotary valve body is rotated 30 degrees in the other direction opposite to the one direction from the state in which the first branch groove and the outlet port face each other. facing the outlet port and not facing the outlet port in a state in which the rotary valve body is rotated 60 degrees in the other direction from a state in which the first branch groove and the outlet port face each other; The second arcuate groove faces the outlet port in a state in which the rotary valve body is rotated 30 degrees and 60 degrees in the other direction from a state in which the second branch groove and the outlet port face each other, and It is characterized in that the rotary valve body is formed so as not to face the outlet port in a state where the second branch groove and the outlet port face each other and is rotated 90 degrees in the other direction.

According to the invention, one inlet port can be connected to one, two or four of the four outlet ports, depending on the rotational position of the rotary valve body. Therefore, it is possible to realize a small-sized flow path switching valve capable of branching the flow of fluid into one or two or four with a simple configuration without combining a plurality of flow path switching valves.

In the present invention, it is preferable that the rotary valve body is arranged movably in the direction of the rotation axis and pushed toward the valve seat surface by a spring member. By doing so, when the fluid pressure in the inlet port rises due to clogging of the first to fourth branch grooves or the first and second arcuate grooves, the rotary valve body moves in the direction of the rotation axis, A gap can be provided between the seat surface and the sliding surface. Therefore, the fluid flows through the gap between the valve seat surface and the sliding surface, and an increase in fluid pressure due to clogging of the groove can be suppressed.

In the present invention, the mechanical paradox planetary gear mechanism further comprises a valve drive section for rotationally driving the rotary valve body, wherein the valve drive section includes a sun gear, a planetary gear, a fixed gear, and an output gear. and the rotary valve body is preferably provided integrally with the output gear. By doing so, it is possible to further effectively reduce the size of the device by integrating the rotary valve body with the paradox planetary gear mechanism which is small and which can obtain relatively high torque.

ADVANTAGE OF THE INVENTION According to this invention, the small flow-path switching valve which can be branched into multiple by simple structure is realizable.

1 is a vertical cross-sectional view of a flow path switching valve according to one embodiment of the present invention; FIG. FIG. 2 is a partially exploded perspective view of the flow path switching valve of FIG. 1; FIG. 2 is a diagram for explaining a valve element included in the flow path switching valve of FIG. 1; FIG. 2 is a diagram for explaining the operation of the flow path switching valve of FIG. 1; It is a figure explaining the modification of the valve body which the flow-path switching valve of FIG. 1 has. FIG. 3 is a longitudinal sectional view showing the configuration of a first modified example of the flow path switching valve of FIG. 1; FIG. 3 is a longitudinal sectional view showing the configuration of a second modification of the flow path switching valve of FIG. 1;

A channel switching valve according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG.

FIG. 1 is a vertical cross-sectional view of a channel switching valve according to one embodiment of the present invention. 2 is a partially exploded perspective view of the flow path switching valve of FIG. 1. FIG. 3A and 3B are diagrams for explaining a valve element included in the flow path switching valve of FIG. 1. FIG. FIG. 3(a) is a perspective view of the valve body as seen from below. FIG.3(b) is the bottom view which looked at the valve body from the downward direction. FIG. 4 is a diagram for explaining the operation of the flow path switching valve of FIG. 1, and is a bottom view of the sliding surface of the valve body as seen from below. FIG. 4(a) is a diagram schematically showing a state in which the first to fourth branch grooves of the valve body face the first to fourth outlet ports of the seat member. FIGS. 4(b) to 4(d) are diagrams schematically showing states in which the valve body is rotated clockwise by 30 degrees, 60 degrees and 90 degrees from the state shown in FIG. 4(a). FIG. 5 is a diagram illustrating a modification of the valve body of the flow path switching valve of FIG. 1, and is a bottom view of the valve body as seen from below. FIG. 5(a) shows a configuration in which the first to fourth branched grooves are arranged in order in the clockwise direction, and FIG. 5(b) shows a configuration in which the first to fourth branched grooves are arranged in order in the counterclockwise direction. .

For example, in a cycle system of an air conditioner, the flow path switching valve 1 of the present embodiment divides the flow of refrigerant discharged from the compressor into one, or branches it into two or four, and supplies it to the compressor. It is used to switch the number of connected heat exchangers.

As shown in each figure, the flow path switching valve 1 has a valve body 5 , a guide 20 , a valve body 30 that is a rotary valve body, and a valve body driving portion 50 .

The valve body 5 has a cylindrical shape as a whole, and is formed so that the diameter increases stepwise from the top to the bottom.

A circular valve seat surface 5a, which is the upper surface of the valve body 5, is provided with an inlet port 10 opening at the center thereof. The inlet port 10 is arranged on the axis L, which is the rotation axis of the valve element 30, on the valve seat surface 5a. In addition, the valve seat surface 5a has a first outlet port 11, a second outlet port 12, a third outlet port 13 and a fourth outlet port 14 arranged at intervals of 90 degrees in the circumferential direction about the axis L. It is provided with an opening. These first to fourth outlet ports 11 to 14 are arranged on a virtual circle VC (indicated by a chain double-dashed line in FIG. 3(b)) virtually arranged with the axis L as the center.

The lower surface 5b of the valve body 5 is provided with an inlet hole 15 opening in the center. In addition, four outlet holes 16 are provided on the lower surface 5b and are arranged at intervals of 90 degrees in the circumferential direction with the inlet hole 15 as the center. Inlet hole 15 communicates with inlet port 10 . The four outlet holes 16 communicate with the first to fourth outlet ports 11-14, respectively. A copper tube 6 is inserted into each of the inlet hole 15 and the four outlet holes 16 . Each copper tube 6 is fixed to the valve body 5 .

The guide 20 is formed in an annular shape with an inner diameter that is the same as the diameter of the valve seat surface 5a. The guide 20 is fitted with the upper portion of the valve body 5 , and the valve seat surface 5 a is arranged inside the guide 20 . A columnar stopper 21 is erected on the upper end surface of the guide 20 .

The valve body 30 integrally has a body portion 31, a flange portion 32, and protrusions 33, 33. As shown in FIG. The body portion 31 is formed in a cylindrical shape. The outer diameter of the body portion 31 is the same as the diameter of the valve seat surface 5a. The lower portion of the body portion 31 is fitted with the guide 20 . A circular sliding surface 31a, which is the lower surface of the body portion 31, is slidably in contact with the valve seat surface 5a. The body portion 31 is arranged to be rotatable around an axis L passing through the centers of the valve seat surface 5a and the sliding surface 31a and to be movable in the direction of the axis L (rotational axis direction). The flange portion 32 is provided on the upper end of the outer peripheral surface of the body portion 31 so as to protrude radially outward. The collar portion 32 is formed in a substantially C shape in plan view. The collar portion 32 has end faces 32a, 32a facing in the circumferential direction. The end faces 32 a , 32 a abut against the stopper 21 of the guide 20 to restrict the rotation range of the valve body 30 together with the stopper 21 . The protrusions 33, 33 are provided on the upper surface 31b of the body portion 31 so as to protrude upward. The protrusions 33, 33 are formed in a substantially quadrangular prism shape. The protrusions 33 , 33 are arranged to face each other with the center of the main body 31 interposed therebetween.

As shown in FIG. 3, the sliding surface 31a has a first branched groove 41, a second branched groove 42, a third branched groove 43, a fourth branched groove 44, a first arcuate groove 45 and a second arcuate groove 46. is provided.

The first to fourth branch grooves 41 to 44 radially extend from the center of the sliding surface 31a (the location corresponding to the inlet port 10) to the location corresponding to the virtual circle VC, and are arranged at intervals of 90 degrees. there is The first branched groove 41 and the second branched groove 42 extend in opposite directions from the center of the sliding surface 31a.

In this embodiment, as shown in FIG. 3B, a first branched groove 41, a third branched groove 43, a second branched groove 42 and a fourth branched groove 44 are arranged in order in the clockwise direction. In addition to this arrangement, the first to fourth branched grooves 41 to 44 may be arranged in sequence in the clockwise direction as shown in FIG. 5(a). Alternatively, the first to fourth branched grooves 41 to 44 may be arranged in order counterclockwise as shown in FIG. 5(b).

The first arcuate groove 45 is continuous with the tip of the first branched groove 41, and is formed in an arc shape so as to extend in one direction D1 (counterclockwise in FIG. 3) from the tip along the virtual circle VC. there is The second arcuate groove 46 is continuous with the tip of the second branched groove 42 and is formed in an arc shape so as to extend in one direction D1 from the tip along the virtual circle VC.

The first arcuate groove 45 and the second arcuate groove 46 will be described with reference to FIG. 3(b). FIG. 3(b) is a view (bottom view) of the valve body 30 viewed from the sliding surface 31a side. In FIG. 3(b), the first outlet port 11, the second outlet port 12, the third outlet port 13, and the fourth outlet port 14 are indicated by dashed lines, and are shown at 6 o'clock, 12 o'clock, 9 o'clock, and 3 o'clock, respectively. placed in position. In addition, it is assumed that a plurality of virtual exit ports VP are indicated by dashed lines and are virtually arranged at 1 o'clock, 2 o'clock, 4 o'clock, 5 o'clock, 7 o'clock, 8 o'clock, 10 o'clock and 11 o'clock, respectively. The first outlet port 11, the second outlet port 12, the third outlet port 13, the fourth outlet port 14, and the plurality of virtual outlet ports VP have the same diameter, and are equally spaced on the virtual circle VC ( are arranged at intervals of 30 degrees). The tip of the first branched groove 41 faces the first outlet port 11 at the 6 o'clock position, and the tip of the second branched groove 42 faces the second outlet port 12 at the 12 o'clock position. In this state, the first arcuate groove 45 is formed to face one virtual exit port VP at the 5 o'clock position, and the second arcuate groove 46 is formed with two virtual exit ports VP at the 10 o'clock and 11 o'clock positions. It is formed to face the outlet port VP.

In the first circular arc groove 45, the valve body 30 rotates 30 degrees in the other direction D2 opposite to the one direction D1 from the state where the tip of the first branch groove 41 and the first outlet port 11 face each other (Fig. 4(a)). It faces the first outlet port 11 in the closed state (FIG. 4(b)). That is, the first arcuate groove 45 and the first outlet port 11 face each other. The first arcuate groove 45 is formed by rotating the valve body 30 by 60 degrees in the other direction D2 from the state in which the tip of the first branch groove 41 and the first outlet port 11 face each other (FIG. 4A). It does not face the first outlet port 11 in FIG. 4(c). That is, the first arcuate groove 45 and the first outlet port 11 are not opposed to each other.

The second arcuate groove 46 is a state in which the valve body 30 is rotated 30 degrees and 60 degrees in the other direction D2 from the state in which the tip of the second branch groove 42 and the second outlet port 12 face each other (FIG. 4(a)). It faces the second outlet port 12 in (FIGS. 4(b) and (c)). That is, the second arcuate groove 46 and the second outlet port 12 face each other. The second arcuate groove 46 is formed by rotating the valve body 30 clockwise by 90 degrees from the state in which the tip of the second branch groove 42 and the second outlet port 12 face each other (FIG. 4A). 4(d)) does not face the second outlet port 12; That is, the second arcuate groove 46 and the second outlet port 12 are not opposed to each other.

The body portion 31 is provided with a shaft hole 47 penetrating from the center of the sliding surface 31a to the upper surface 31b. A drive shaft 54 to be described later is inserted into the shaft hole 47 . Further, the body portion 31 is provided with four pressure equalizing holes 48 penetrating from the tips of the first to fourth branched grooves 41 to 44 to the upper surface 31b.

The valve body driving section 50 rotationally drives the valve body 30 so as to rotate about the axis L. As shown in FIG. The valve body drive section 50 has a can 51, a rotor 52, a stator 53, a drive shaft 54, and a plate spring 55 as a spring member.

The can 51 is formed in a cylindrical shape with a closed upper end. The valve body 5 is fitted in the lower end 51 a of the can 51 . A lower end 51 a of the can 51 is welded to the valve body 5 . The rotor 52 is rotatably arranged inside the can 51 . The stator 53 is arranged outside the can 51 . The rotor 52 and stator 53 constitute a stepping motor. A drive shaft 54 is coaxially fixed to the rotor 52 . The upper end of drive shaft 54 is rotatably supported by bearing 56 . A lower end of the drive shaft 54 is supported by the shaft hole 47 of the valve body 30 .

The leaf spring 55 is configured to transmit the rotation of the drive shaft 54 to the valve body 30 and push the valve body 30 toward the valve seat surface 5a. The leaf spring 55 is formed in a disc shape. The plate spring 55 is fixed by welding to the drive shaft 54 inserted through the central through hole 55a. The plate spring 55 is provided with arc-shaped spring portions 55b, 55b and notch portions 55c, 55c on the peripheral portion thereof. The spring portions 55 b , 55 b are bent elastically deformable so that respective tip portions come into contact with the upper surface 31 b of the body portion 31 of the valve body 30 . The spring portions 55b, 55b are in contact with the upper surface 31b of the valve body 30 and push the valve body 30 downward. As a result, the sliding surface 31a of the valve body 30 is pressed against the valve seat surface 5a. The projections 33, 33 of the valve body 30 are fitted inside the cutouts 55c, 55c.

Next, the operation of the flow path switching valve 1 of this embodiment will be described with reference to FIG. 4, illustration of the shaft hole 47 and the pressure equalizing hole 48 is omitted.

4A, the tip of the first branched groove 41 faces the first outlet port 11, the tip of the second branched groove 42 faces the second outlet port 12, and the third branched groove The tip of 43 and the third outlet port 13 face each other, and the tip of the fourth branch groove and the fourth outlet port 14 face each other. In this state, the inlet port 10 is connected to the first to fourth outlet ports 11 to 14, and the refrigerant flow from the inlet port 10 branches into four.

The valve body 30 is rotated 30 degrees in the other direction D2 from the state shown in FIG. 4(a) to the state shown in FIG. 4(b). In this state, the first arcuate groove 45 faces the first outlet port 11, the second arcuate groove 46 faces the second outlet port 12, and the third outlet port 13 and the fourth outlet port 14 face each other. 30 is blocked by the sliding surface 31a. As a result, the inlet port 10 is connected to the first outlet port 11 and the second outlet port 12, and the refrigerant flow from the inlet port 10 branches into two.

The valve body 30 is rotated 30 degrees in the other direction D2 from the state shown in FIG. 4(b) to the state shown in FIG. 4(c). In this state, the second arcuate groove 46 and the second outlet port 12 face each other, and the first outlet port 11, the third outlet port 13 and the fourth outlet port 14 are closed by the sliding surface 31a of the valve body 30. . As a result, the inlet port 10 is connected only to the second outlet port 12, and the flow of the refrigerant from the inlet port 10 does not branch and becomes one flow.

The valve body 30 is rotated 30 degrees in the other direction D2 from the state shown in FIG. 4(c) to the state shown in FIG. 4(d). The tip of the first branched groove 41 faces the third outlet port 13, the tip of the second branched groove 42 faces the fourth outlet port 14, and the tip of the third branched groove 43 faces the second outlet port 12. are opposed to each other, and the tip of the fourth branched groove 44 and the first outlet port 11 are opposed to each other. As a result, the inlet port 10 is connected to the first to fourth outlet ports 11 to 14, and the refrigerant flow from the inlet port 10 is branched into four.

Thus, in the flow path switching valve 1 , the refrigerant flow from the inlet port 10 can be one, or can be branched into two or four, depending on the rotational position of the valve element 30 .

As described above, according to the flow path switching valve 1 of the present embodiment, the valve seat surface 5a has the inlet port 10 arranged on the axis L and the inlet ports 10 on the virtual circle VC centering on the axis L at intervals of 90 degrees. Disposed first through fourth outlet ports 11-14 are provided. The sliding surface 31a of the valve body 30 has first to fourth branch grooves 41 to 44 extending from the center of the sliding surface 31a to a point corresponding to the virtual circle VC and arranged at intervals of 90 degrees. A first arcuate groove 45 connected to the tip of the groove 41 and extending in one direction D1 along the virtual circle VC, and a first arcuate groove 45 connected to the tip of the second branch groove 42 and extending in one direction D1 along the virtual circle VC. A second arcuate groove 46 is provided. The first arcuate groove 45 faces the first outlet port 11 in a state in which the valve body 30 is rotated 30 degrees in the other direction D2 from the state in which the tip of the first branched groove 41 and the first outlet port 11 face each other, In addition, the tip of the first branch groove 41 and the first outlet port 11 are formed so as not to face the first outlet port 11 when the valve body 30 is rotated 60 degrees in the other direction D2. . The second arcuate groove 46 forms the second outlet port 12 when the valve body 30 is rotated 30 degrees and 60 degrees in the other direction D2 from the state in which the tip of the second branch groove 42 and the second outlet port 12 face each other. 12, and the tip of the second branch groove 42 and the second outlet port 12 are rotated 90 degrees in the other direction D2 so that the valve body 30 does not face the second outlet port 12. is formed in As a result, one inlet port 10 can be connected to one, two or four of the first to fourth outlet ports 11 to 14 depending on the rotational position of the valve body 30. can. Therefore, it is possible to realize a small-sized flow path switching valve that allows the flow of the refrigerant to be one, or to branch into two or four, with a simple configuration without combining a plurality of flow path switching valves.

Further, the valve body 30 is arranged to be movable in the direction of the axis L, and is pushed toward the valve seat surface 5a by the plate spring 55 . By doing so, when the refrigerant pressure in the inlet port 10 rises due to clogging of the first to fourth branched grooves 41 to 44, the first arcuate groove 45, and the second arcuate groove 46, the valve element 30 moves along the axis. A gap can be provided between the valve seat surface 5a and the sliding surface 31a by moving in the L direction. Therefore, the refrigerant flows through the gap between the valve seat surface 5a and the sliding surface 31a, thereby suppressing an increase in refrigerant pressure due to clogging of the groove.

FIG. 6 shows a flow path switching valve 1A according to a first modification of the flow path switching valve 1 of this embodiment. FIG. 6 is a vertical cross-sectional view showing the configuration of a first modification of the flow path switching valve of FIG. This channel switching valve 1A has a structure in which a valve body 30A is directly attached to a rotor 52. As shown in FIG. The flow path switching valve 1A has a coil spring 57 instead of the leaf spring 55. As shown in FIG. The coil spring 57 presses the valve body 30A toward the valve seat surface 5a via the drive shaft 54. As shown in FIG. The sliding surface 31a of the valve body 30A of the flow path switching valve 1A is also provided with the first to fourth branch grooves 41 to 44, the first arcuate groove 45 and the second arcuate groove 46, which are the same as those in the above-described embodiment. ing.

FIG. 7 shows a flow path switching valve 1B according to a second modification of the flow path switching valve 1 of this embodiment. FIG. 7 is a vertical cross-sectional view showing the configuration of a second modification of the flow path switching valve of FIG. This flow path switching valve 1B has a paradox planetary gear mechanism 60. As shown in FIG. The paradox planetary gear mechanism 60 has a sun gear 61 , a plurality of planetary gears 62 , a fixed gear 63 and an output gear 64 . The sun gear 61 is attached to the lower end of the drive shaft 54 . The plurality of planetary gears 62 are rotatably supported by a carrier 65, mesh with the sun gear 61, and are provided to revolve around the sun gear 61 as the sun gear 61 rotates. A fixed gear 63 is an internal gear that meshes with the plurality of planetary gears 62 and is fixed to the can 51 . The output gear 64 is an internal gear that meshes with the plurality of planetary gears 62 . The output gear 64 has a different number of teeth from the fixed gear 63 . The output gear 64 is integrally provided with the valve body 30B. The output gear 64 is rotatably supported around the axis L on the valve body 5 . The flow path switching valve 1B has a plurality of truncated conical coil springs 66 in place of the plate springs 55 . A plurality of coil springs 66 are arranged between the carrier 65 and the output gear 64 (valve element 30B). A plurality of coil springs 66 push the valve body 30B toward the valve seat surface 5a. The coil spring 66 can suppress buckling by having a truncated cone shape. The sliding surface 31a of the valve body 30B of the flow path switching valve 1B is also provided with the first to fourth branch grooves 41 to 44, the first arcuate groove 45 and the second arcuate groove 46, which are the same as those in the above-described embodiment. ing. This flow path switching valve 1B has a small paradox planetary gear mechanism 60 capable of obtaining a relatively high torque. Can be made smaller.

These flow path switching valves 1A and 1B also have the same effects as the flow path switching valve 1 of the present embodiment described above.

Although embodiments of the present invention have been described above, the present invention is not limited to these examples. A person skilled in the art may add, delete, or change the design of the above-described embodiments as appropriate, or combine the features of the embodiments as appropriate, as long as they do not conflict with the spirit of the present invention. included in the range of Although the terms inlet port and outlet port are used in the embodiments of the present invention, these terms are used for convenience to indicate the opposite directions of fluid flow and are used in the present invention. The flow path switching valve also includes a configuration that allows fluid to flow into the outlet port and flow out of the inlet port.

DESCRIPTION OF SYMBOLS 1, 1A, 1B... Flow-path switching valve 5... Valve body 5a... Valve seat surface 5b... Lower surface 6... Copper pipe 10... Inlet port 11... First outlet port 12... Second outlet port DESCRIPTION OF SYMBOLS 13... 3rd outlet port, 14... 4th outlet port, 15... Inlet hole, 16... Outlet hole, 20... Guide, 21... Stopper, 30, 30A, 30B... Valve body, 31... Main-body part, 31a... Sliding Surface 31b Upper surface 32 Collar 32a End face 33 Projection 41 First branched groove 42 Second branched groove 43 Third branched groove 44 Fourth branched groove 45 First arcuate groove 46 Second arcuate groove 47 Shaft hole 48 Pressure equalizing hole 50 Valve body driving portion 51 Can 51a Lower end 52 Rotor 53 Stator 54 Drive shaft , 55... Leaf spring 55a... Through hole 55b... Spring part 55c... Notch part 56... Bearing 57... Coil spring 60... Paradox planetary gear mechanism 61... Sun gear 62... Planetary gear 63... Fixed gear 64 Output gear 65 Carrier 66 Coil spring VC Virtual circle VP Virtual exit port

Claims (3)

A flow path switching valve comprising a valve body having a valve seat surface and a rotary valve body having a sliding surface slidably contacting the valve seat surface,
The valve seat surface is provided with one inlet port arranged on the rotation axis of the rotary valve body and four outlet ports arranged at intervals of 90 degrees on a virtual circle centered on the rotation axis. be
The sliding surface includes first to fourth branch grooves extending from a location corresponding to the inlet port to a location corresponding to the virtual circle and arranged at intervals of 90 degrees; A first arcuate groove extending in one direction along the virtual circle and a second arcuate groove connected to the second branch groove and extending in the one direction along the virtual circle are provided,
The first arcuate groove faces the outlet port in a state in which the rotary valve body is rotated 30 degrees in the other direction opposite to the one direction from a state in which the first branch groove and the outlet port face each other, and formed so as not to face the outlet port when the rotary valve body is rotated 60 degrees in the other direction from a state in which the first branch groove and the outlet port face each other,
The second arcuate groove faces the outlet port in a state in which the rotary valve body is rotated 30 degrees and 60 degrees in the other direction from a state in which the second branch groove and the outlet port face each other, and The flow path is formed so as not to face the outlet port in a state in which the rotary valve body is rotated 90 degrees in the other direction from a state in which the second branch groove and the outlet port face each other. switching valve. 2. The flow path switching valve according to claim 1, wherein said rotary valve body is arranged movably in the direction of the rotation axis and pressed toward said valve seat surface by a spring member. further comprising a valve body driving section that drives the rotary valve body to rotate;
the valve body driving portion has a paradox planetary gear mechanism having a sun gear, a planetary gear, a fixed gear, and an output gear;
3. The flow path switching valve according to claim 1, wherein said rotary valve body is provided integrally with said output gear.

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