Switching valve

Abstract

Provided is a switching valve capable of maintaining a favorable contact state between a contact surface of a rotor and a seat surface of a stator in the rotation range of the rotor.　A stator 30 is provided with a plurality of entry ports P1−P3 and a plurality of exit ports P4−P7 through which a working fluid passes, a rotor 50 is provided with at least two through-holes 51, 52 and communication grooves 53−55 allowing selective communication between the entry ports P1−P3 and the exit ports P4−P7, a case 20 is provided with an opening 21 for fluid entry communicating with the through-holes 51, 52, and at least one of the through-holes 51, 52 always communicates with one of the exit ports P4−P7 within the rotation range of the rotor 50.

Description

Technical Field

[0001] The present invention relates to a switching valve for switching a flow path through which a fluid flows.

Background Art

[0002] In various industrial fields, a fluid circuit in which a fluid supply source and a fluid load such as a fluid operating device or a heat exchanger are connected by a flow path is used. Some of such fluid circuits are provided with a switching valve for switching the flow path of the working fluid, so that a plurality of modes for operating the fluid load by one fluid circuit can be realized.

[0003] [[ID=

[16] ]]For example, the switching valve of Patent Document is mainly composed of a stator having a seat surface, a case hermetically attached to the stator, and a rotor disposed in a space formed between the stator and the case. The rotor has a contact surface that contacts the seat surface of the stator and is configured to be rotationally driven by a motor. Further, the stator is provided with an introduction port and a discharge port through which the working fluid passes.

[0004] The rotor is rotatable between a first rotation position, a second rotation position, and a third rotation position. In the first rotation position of the rotor, two ports are not blocked by the rotor and are open, and the two ports communicate with each other through the space formed between the stator and the case. In the second rotation position of the rotor, one port is blocked by the rotor and the other port is open, and the communication between the two ports is blocked. In the third rotation position of the rotor, one port is open and the other port is blocked by the rotor, and the communication between the two ports is blocked. Thus, by changing the first rotation position, the second rotation position, and the third rotation position of the rotor, the connection of each flow path through which the working fluid flows can be switched, and the fluid load can be operated in various modes.

[0005] Furthermore, the rotor's contact surface is pressed against the stator's seating surface by the pressure of the working fluid introduced into the space between the stator and the case, thereby maintaining contact between the rotor's contact surface and the stator's seating surface. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2014-185662 (page 16, Figure 3) [Overview of the project] [Problems that the invention aims to solve]

[0007] In the switching valve described in Patent Document 1, when the rotor is in its first rotation position, the flow of working fluid between the two ports is permitted, which stabilizes the pressure in the space inside the case and maintains good contact between the rotor contact surface and the stator seating surface. However, when the rotor is in its second and third rotation positions, the flow of working fluid between the ports is restricted, which can cause the pressure in the space inside the case to rise or fall, altering the contact between the rotor contact surface and the stator seating surface, and potentially making it impossible to maintain good contact between them.

[0008] This invention was made in view of these problems, and aims to provide a switching valve that can maintain a good contact state between the rotor contact surface and the stator seating surface within the rotor's rotation range. [Means for solving the problem]

[0009] To solve the above problems, the switching valve of the present invention is The system comprises a stator having a seating surface, a case sealed and connected to the stator, and a rotor having a contact surface that abuts the seating surface and positioned between the stator and the case, The rotor is driven to rotate between a first rotation position relative to the stator, a second rotation position rotated to one side from the first rotation position, and a third rotation position rotated to the other side from the first rotation position, and the rotor is configured to have different flow path patterns at the first rotation position, the second rotation position, and the third rotation position of the rotor, in a switching valve. The stator is provided with multiple inlet ports and outlet ports through which the working fluid passes. The rotor is provided with at least two through holes and a communication groove that allows selective communication between the inlet port and the outlet port. The case is provided with openings for introducing fluid, which are in communication with each of the through holes. At least one of the through holes is always in communication with one of the output ports within the rotation range of the rotor. According to this design, the working fluid introduced into the space within the case through the fluid introduction opening acts to press the rotor toward the stator, and at any position within the rotor's rotation range, it flows from at least one through hole to one of the outlet ports. This suppresses fluctuations in the force acting on the rotor axially from the fluid. As a result, a good contact state between the rotor's contact surface and the stator's seating surface can be maintained within the rotor's rotation range.

[0010] The opening area of ​​the through-hole communicating with the aforementioned outlet port may be constant within the rotational range of the rotor. According to this, since the opening area of ​​the through-hole relative to the outlet port is approximately constant, it is easy to maintain a constant contact state between the rotor's contact surface and the stator's seating surface within the rotor's rotation range.

[0011] Each of the aforementioned input ports may always be in communication with one of the aforementioned output ports within the rotational range of the rotor. According to this design, since the inlet port is always in communication with one of the outlet ports within the rotor's rotation range, various flow path patterns can be configured at the rotor's first, second, and third rotation positions. In addition, the rotor and stator become more compact.

[0012] Each of the inlet ports may have a constant opening area that communicates with the outlet port within the rotation range of the rotor. According to this, it is possible to suppress fluctuations in the pressure within each flow path within the rotation range of the rotor.

[0013] In the stator, an outlet port that can communicate with the through hole is provided in a region on one side with reference to a virtual line passing through the center of the stator. In the stator, two or more sets of the outlet ports and the inlet ports may be provided in a region on the other side with reference to the virtual line. According to this, it is possible to switch the communication state between the outlet port provided in the region on one side and the through hole, and to switch the communication states of two or more sets of the outlet ports and the inlet ports provided in the region on the other side with a short rotation stroke.

Brief Description of the Drawings

[0014] [Figure 1] It is a perspective view of a switching valve according to an embodiment of the present invention. [Figure 2] It is a side cross-sectional view of the switching valve. [Figure 3] (a) is a top view of the rotor, and (b) is a bottom view of the rotor. [Figure 4] (a) is a top view of the stator, and (b) is a bottom view of the stator. [Figure 5] (a) is a schematic diagram showing the first mode of the fluid circuit, and (b) is a schematic diagram showing the first rotation position of the rotor. [Figure 6] (a) is a schematic diagram showing the second mode of the fluid circuit, and (b) is a schematic diagram showing the second rotation position of the rotor. [Figure 7] (a) is a schematic diagram showing the third mode of the fluid circuit, and (b) is a schematic diagram showing the third rotation position of the rotor.

Embodiments for Carrying Out the Invention

[0015] A mode for implementing the switching valve according to the present invention will be described below based on an embodiment.

Embodiment

[0016] The switching valve according to the embodiment will be described with reference to FIGS. 1 to 7. Hereinafter, the up and down in FIG. 2 will be described as the up and down of the switching valve. Specifically, the upper side of the paper surface where the motor is arranged will be described as the upper side of the switching valve, and the lower side of the paper surface, which is the opposite side, will be described as the lower side of the switching valve.

[0017] As shown in FIG. 1, the switching valve V of the present invention is used to select one of a plurality of modes of a fluid circuit and switch a flow path through which a heat medium as a working fluid flows. The switching valve V of the embodiment is an electric motor-driven rotary valve.

[0018] As shown in FIGS. 1 and 2, the switching valve V mainly includes a housing 10, a rotor 50 (see FIG. 2), and a drive unit 80.

[0019] The housing 10 is composed of a bottomed cylindrical case 20 and a cylindrical stator 30. The case 20 and the stator 30 are formed of a metal material or a resin material.

[0020] The case 20 is provided with a plurality of flange portions 20a protruding outward in the outer diameter direction at the lower end of the outer peripheral surface, spaced apart in the circumferential direction. The stator 30 is provided with a plurality of flange portions 30a protruding outward in the outer diameter direction on its outer peripheral surface, spaced apart in the circumferential direction. The case 20 and the stator 30 are connected by the flange portions 20a and 30a and bolts not shown.

[0021] The bottom 20A of the case 20 is provided with a communication hole 21 and an insertion hole 22 penetrating in the vertical direction. The communication hole 21 is provided at a position on the outer diameter side of the bottom 20A and communicates with the discharge side of a compressor C2 described later. That is, the communication hole 21 functions as an opening for fluid introduction. The insertion hole 22 is provided at the center of the bottom 20A, and a rotating shaft 80a is inserted therethrough as described later.

[0022] The rotor 50 is located inside the housing 10. The specific shape of the rotor 50 will be described in detail later.

[0023] The drive unit 80 is sealed and fixed to the housing 10 and is designed to rotate the rotor 50. Specifically, the drive unit 80 is cased with a plurality of gears, a rotating shaft 80a that meshes with the gears, and a motor that drives them. The rotating shaft 80a extends in the vertical direction, and its lower end extends into the space S1 inside the housing 10 through the insertion hole 22 of the case 20. The lower end of the rotating shaft 80a is fitted into a recess 50b of the rotor 50.

[0024] As shown in Figure 3, the rotor 50 is disc-shaped. A projection 50a is formed in the center of the upper surface of the rotor 50, projecting upward. The projection 50a is provided with a recess 50b that opens upward. The recess 50b is square in shape when viewed from above and is designed to fit with the lower end of the rectangular rotating shaft 80a (see Figure 2).

[0025] In this embodiment, the recess 50b engages with the lower end of the rotating shaft 80a, causing the rotating shaft 80a and the rotor 50 to rotate together. However, the recess 50b may be omitted, and the rotating shaft and rotor may be integrally formed by welding or other means.

[0026] Furthermore, the rotor 50 has a through hole 51 and a through hole 52 formed therein. The through holes 51 and 52 are positioned towards the outer diameter side of the rotor 50. In a top view, the through hole 52 is located approximately 90 degrees counterclockwise from the through hole 51 with respect to the rotation center of the rotor 50.

[0027] Furthermore, a first communication groove 53, a second communication groove 54, and a third communication groove 55 are formed on the lower surface 50c of the rotor 50. This lower surface 50c of the rotor 50 is a contact surface that abuts against the upper surface 30c of the stator 30, which will be described later, as a seating surface. Each of the communication grooves 53 to 55 is an elongated groove that opens downwards, and each has a different shape.

[0028] The rotor 50 is subjected to a greater downward pressure from the heat transfer medium flowing into the space S1 from the compressor C2 through the communication hole 21 (described later) than from the upward pressure from the heat transfer medium flowing in from the introduction ports P1 to P3 (described later). This allows the lower surface 50c of the rotor 50 to maintain contact with the upper surface 30c of the stator 30. Preferably, the heat transfer medium with the highest average pressure during use is supplied to the communication hole 21.

[0029] As shown in Figure 4, the stator 30 is provided with three inlet ports P1 to P3, four outlet ports P4 to P7, and long grooves 31 to 33.

[0030] Specifically, with reference to a virtual line X passing through the center of the stator 30, one side of the stator 30, region A1 (i.e., the upper side of the paper in Figures 4(a) and (b)), is provided with an input port P1 and output ports P4 and P5. With reference to the virtual line X passing through the center of the stator 30, the other side of the stator 30, region A2 (i.e., the lower side of the paper in Figures 4(a) and (b)), is provided with input ports P2 and P3 and output ports P6 and P7.

[0031] Furthermore, the elongated grooves 31 to 33 are formed to open upward on the upper surface 30c of the stator 30. Elongated groove 31 communicates with the inlet port P1. Elongated groove 32 communicates with the outlet port P4. Elongated groove 33 communicates with the outlet port P5. These elongated grooves 31 to 33 function to enlarge the opening area on the upper side of the inlet port P1 and the outlet ports P4 and P5.

[0032] Next, the various modes of the fluid circuit 100 and the first, second, and third rotation positions of the rotor 50 that constitute each mode will be explained using Figures 5 to 7. For the sake of clarity, the stator 30 is shown with a solid line and the rotor 50 with a dashed-dot line. Furthermore, the through holes 51 and 52, the first communication groove 53, the second communication groove 54, and the third communication groove 55 of the rotor 50 are shown with dots.

[0033] As shown in Figure 5(a), the fluid circuit 100 mainly consists of two compressors C1 and C2, two loads A and B, eight fluid pipes T1 to T8, and a switching valve V. The pressure of the heat transfer medium supplied from compressor C2 is higher than the pressure of the heat transfer medium supplied from compressor C1. Thus, because a heat transfer medium with a higher pressure than that supplied from compressor C1 is supplied to the communication hole 21 from compressor C2, the lower surface 50c of the rotor 50 can be brought into contact with the upper surface 30c of the stator 30.

[0034] Fluid pipe T1 connects compressor C1 to inlet port P1. Fluid pipe T2 connects outlet port P5 to load A. Fluid pipe T3 connects load A to inlet port P3. Fluid pipe T4 connects outlet port P6 to compressor C1. Fluid pipe T5 connects compressor C2 to inlet port P8. Fluid pipe T6 connects outlet port P4 to load B. Fluid pipe T7 connects load B to inlet port P2. Fluid pipe T8 connects outlet port P7 to compressor C2.

[0035] In the first mode of the fluid circuit 100, the switching valve V has a first flow path pattern in which a flow path R1 extending from the inlet port P1 communicates with the outlet port P5, a flow path R2 extending from the inlet port P3 communicates with the outlet port P7, a flow path R3 extending from the inlet port P8 communicates with the outlet port P4, and a flow path R4 extending from the inlet port P2 communicates with the outlet port P6.

[0036] Figure 5(b) shows the first rotation position of the rotor 50 that constitutes the first flow path pattern of the switching valve V. In this first rotation position of the rotor 50, the through hole 51 is connected to the outlet port P4, the inlet port P1 is connected to the outlet port P5, the inlet port P2 is connected to the outlet port P6, and the inlet port P3 is connected to the outlet port P7.

[0037] Specifically, the through-hole 51 communicates with the outlet port P4 through the long groove 32. Since the through-hole 51 communicates with space S1, the heat transfer medium in space S1 flows through the through-hole 51 to the outlet port P4 (see Figures 2 and 3). That is, in the first rotation position of the rotor 50, the through-hole 51 functions as an inlet port P8. In addition, the long groove 32 effectively constitutes a flow path R3. The through-hole 52 is closed off by the upper surface 30c of the stator 30 and does not communicate with the outlet ports P4 to P7.

[0038] The inlet port P1 is connected to the outlet port P5 through the long groove 31, the first connecting groove 53, and the long groove 33. In other words, the long groove 31, the first connecting groove 53, and the long groove 33 effectively constitute the flow path R1.

[0039] The inlet port P2 is connected to the outlet port P6 through the second communication groove 54. In other words, the second communication groove 54 effectively constitutes the flow path R4.

[0040] The inlet port P3 is connected to the outlet port P7 through the third communication groove 55. In other words, the third communication groove 55 effectively constitutes the flow path R2.

[0041] As shown in Figure 6(a), in the second mode of the fluid circuit 100, the switching valve V has a second flow path pattern in which flow path R1 extending from the inlet port P1 communicates with the outlet port P5, flow path R2' extending from the inlet port P3 communicates with the outlet port P6, flow path R3 extending from the inlet port P8 communicates with the outlet port P4, and flow path R4' extending from the inlet port P2 communicates with the outlet port P7. In other words, the second flow path pattern of the switching valve V is switched only in the destinations of the flow paths R2' and R4' compared to the first flow path pattern.

[0042] Figure 6(b) shows the second rotation position of the rotor 50, which constitutes the second flow path pattern of the switching valve V. This second rotation position of the rotor 50 is the position where the rotor 50 has rotated approximately 30 degrees counterclockwise from the first rotation position when viewed from above.

[0043] The through-hole 51 communicates with the outlet port P4 through the long groove 32. In other words, the long groove 32 effectively constitutes the flow path R3, and the through-hole 51 functions as the inlet port P8. The through-hole 52 is closed off by the upper surface 30c of the stator 30.

[0044] Furthermore, the inlet port P1 is connected to the outlet port P5 through the long groove 31, the first connecting groove 53, and the long groove 33. In other words, the long groove 31, the first connecting groove 53, and the long groove 33 effectively constitute the flow path R1.

[0045] The inlet port P2 is connected to the outlet port P7 through the second communication groove 54. In other words, the second communication groove 54 effectively constitutes the flow path R4'.

[0046] Furthermore, the inlet port P3 is connected to the outlet port P6 through the third connecting groove 55. In other words, the third connecting groove 55 effectively constitutes the flow path R2'.

[0047] Furthermore, the through-hole 51 is always in communication with the outlet port P4 throughout the rotation range of the rotor 50 from the first rotation position to the second rotation position. Similarly, the inlet port P1 is always in communication with the outlet port P5 throughout the rotation range of the rotor 50 from the first rotation position to the second rotation position.

[0048] During the rotation range of the rotor 50 from the first rotation position to the second rotation position, the opening area of ​​the outlet port P6 that communicates with the second communication groove 54 (i.e., the inlet port P2) gradually decreases, while the opening area of ​​the outlet port P6 that communicates with the third communication groove 55 (i.e., the inlet port P3) gradually increases. When the rotor 50 reaches the second rotation position, the entire opening area of ​​the outlet port P6 is in communication with the inlet port P3.

[0049] During the rotation range of the rotor 50 from the first rotation position to the second rotation position, the opening area of ​​the outlet port P7 that communicates with the third communication groove 55 (i.e., the inlet port P3) gradually decreases, while the opening area of ​​the outlet port P7 that communicates with the second communication groove 54 (i.e., the inlet port P2) gradually increases. When the rotor 50 reaches the second rotation position, the entire opening area of ​​the outlet port P7 is in communication with the inlet port P2.

[0050] Within the rotation range of the rotor 50 from the first rotation position to the second rotation position, there is a section in which the input ports P2 and P3 are simultaneously in communication with the output ports P6 and P7. In other words, at least one of the input ports P2 or P3 is in communication with the output ports P6 and P7 within the rotation range of the rotor 50 from the first rotation position to the second rotation position.

[0051] Furthermore, within the rotational range of the rotor 50 from the first rotational position to the second rotational position, the opening areas of the inlet ports P2 and P3 communicating with the outlet port P6, and the opening areas of the inlet ports P2 and P3 communicating with the outlet port P7 are substantially constant. In this specification, "substantially constant" means that a variation of ±20% is permitted.

[0052] As shown in Figure 7(a), in the third mode of the fluid circuit 100, the switching valve V has a third flow path pattern in which the flow path R1' extending from the inlet port P1 communicates with the outlet port P4, the flow path R2 extending from the inlet port P3 communicates with the outlet port P7, the flow path R3' extending from the inlet port P8 communicates with the outlet port P5, and the flow path R4 extending from the inlet port P2 communicates with the outlet port P6. In other words, the third flow path pattern of the switching valve V is a change from the first flow path pattern in which only the destinations of the flow paths R1' and R3' are switched.

[0053] Figure 7(b) shows the third rotation position of the rotor 50, which constitutes the third flow path pattern of the switching valve V. This third rotation position of the rotor 50 is the position where the rotor 50 has rotated approximately 30 degrees clockwise from the first rotation position when viewed from above.

[0054] The inlet port P1 is connected to the outlet port P4 through the long groove 31, the first connecting groove 53, and the long groove 32. In other words, the long groove 31, the first connecting groove 53, and the long groove 32 substantially constitute the flow path R1'.

[0055] The through-hole 52 communicates with the outlet port P5 through the elongated groove 33. That is, in the third rotation position of the rotor 50, the through-hole 52 functions as the inlet port P8. In other words, the elongated groove 33 effectively constitutes the flow path R3'.

[0056] The inlet port P2 is connected to the outlet port P6 through the second communication groove 54. In other words, the second communication groove 54 effectively constitutes the flow path R4.

[0057] The inlet port P3 is connected to the outlet port P7 through the third communication groove 55. In other words, the third communication groove 55 effectively constitutes the flow path R2.

[0058] More specifically, the through-hole 51 gradually decreases in its opening area communicating with the outlet port P4 during the rotation range of the rotor 50 from the first rotation position to the third rotation position, and when it reaches the third rotation position, it is not in communication with any of the ports.

[0059] Furthermore, as the rotor 50 rotates from its first to third rotation positions, the opening area of ​​the inlet port P1 that communicates with the outlet port P5 gradually decreases, while the opening area of ​​the outlet port P4 that communicates with the outlet port gradually increases. When the rotor 50 reaches its third rotation position, the entire opening area of ​​the inlet port P1 is in communication with the outlet port P4.

[0060] Furthermore, in the rotation range of the rotor 50 from the first rotation position to the third rotation position, the opening area of ​​the through hole 52 gradually increases from a state of not communicating with any port to a state of communicating with the lead port P5, and at the third rotation position, the entire opening area of ​​the through hole 52 is in communication with the lead port P5.

[0061] Within the rotation range of the rotor 50 from the first rotation position to the third rotation position, there is a section in which the through hole 51 and the introduction port P1 are simultaneously in communication with the output port P4, and a section in which the through hole 52 and the introduction port P1 are simultaneously in communication with the output port P5. In other words, within the rotation range of the rotor 50 from the first rotation position to the third rotation position, at least one of the introduction port P1 and the through holes 51, 52 (i.e., the introduction port P8) are in communication with the output ports P4 and P5, respectively.

[0062] Furthermore, within the rotational range of the rotor 50 from the first rotational position to the third rotational position, the opening areas of the inlet ports P1 and P8 communicating with the outlet port P4 and the opening areas of the inlet ports P1 and P8 communicating with the outlet port P5 are approximately constant.

[0063] As explained above, in the rotation range of the rotor 50 at the first, second, and third rotation positions, at least one of the through holes 51 and 52 is always in communication with at least one of the outlet ports P4 and P5. Therefore, the heat transfer fluid introduced into the space S1 within the case 20 from the communication hole 21 flows to at least one of the outlet ports P4 and P5 at any position within the rotation range of the rotor 50. When the rotor 50 rotates, it receives fluid pressure from both axial sides, and the amount of fluctuation in the force acting to push the rotor 50 toward the stator 30 in accordance with this pressure difference can be kept within a small range. In addition, when the rotor 50 rotates, the flow path connecting the space S1 and the outlet ports P4 and P5 is not blocked, and the fluid pressure in the space S1 does not increase rapidly. In this way, a good contact state between the lower surface 50c of the rotor 50 and the upper surface 30c of the stator 30 can be maintained within the rotation range of the rotor 50.

[0064] Furthermore, since the opening area of ​​the through holes 51 and 52 communicating with the outlet ports P4 and P5 is approximately constant within the rotation range of the rotor 50, it is easy to maintain a constant contact state between the lower surface 50c of the rotor 50 and the upper surface 30c of the stator 30 within the rotation range of the rotor 50.

[0065] Furthermore, the inlet ports P1 to P3 are always connected to one of the outlet ports P4 to P7 within the rotation range of the rotor 50. In other words, by utilizing all of the inlet ports P1 to P3 and outlet ports P4 to P7, a variety of flow path patterns can be configured at the first, second, and third rotation positions of the rotor 50. In addition, the rotor 50 and stator 30 become more compact.

[0066] Furthermore, since the opening area of ​​the inlet ports P1 to P3 communicating with the outlet ports P4 to P7 is approximately constant within the rotation range of the rotor 50, pressure fluctuations within each flow path R1 to R4 can be suppressed within the rotation range of the rotor 50.

[0067] Furthermore, in the stator 30, one region A1 on either side of the imaginary line X passing through the center of the stator 30 is provided with lead ports P4 and P5 that can communicate with through holes 51 and 52, and an inlet port P1 that can communicate with either lead port P4 or lead port P5. In the stator 30, the other region A2 on either side of the imaginary line X is provided with two sets of lead ports P6 and P7 and inlet ports P2 and P3. This allows switching the communication state between the through holes 51 and 52 and inlet port P1 in one region A1 and the lead ports P4 and P5, and switching the communication state between the two sets of lead ports P6 and P7 and inlet ports P2 and P3 in the other region A2, to be performed with a short rotation stroke.

[0068] Although embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any changes or additions that do not depart from the spirit of the present invention are also included.

[0069] For example, in the above embodiment, a configuration was shown in which there are three modes of the fluid circuit, three flow path patterns of the switching valve, and three rotation positions of the rotor, but there may be four or more modes, flow path patterns, and rotation positions.

[0070] Furthermore, although the above embodiment described the switching valve as an 8-way switching valve having eight substantially functional ports, the configuration is not limited to this, and the number of connected external flow paths may be changed as appropriate.

[0071] Furthermore, although the above embodiment was described as having a heat transfer fluid and a compressor as the fluid supply source, the configuration is not limited to this, and the working fluid may be a fluid other than a heat transfer fluid, and the fluid supply source may be a pump or the like.

[0072] Furthermore, although the rotor was described in the above embodiment as being formed in a disc shape, it is not limited to this and may be C-shaped, fan-shaped, or the like, and its shape may be changed as appropriate.

[0073] Furthermore, in the above embodiment, the rotor is pressed towards the stator by the working fluid in the space within the housing, thereby maintaining a state in which the contact surface of the rotor and the seating surface of the stator are in contact. However, in addition to this, the rotor may also be pressed towards the stator by a coil spring or the like.

[0074] Furthermore, although the above embodiment was described as having a rotor that is rotated by a motor, it is not limited to this configuration and may be operated manually or changed to a drive source other than a motor as appropriate.

[0075] Furthermore, although the above embodiment illustrates a configuration in which the rotor is provided with two through holes, it is not limited to this configuration and may be provided with three or more holes. [Explanation of symbols]

[0076] 10 Housing 20 cases 21. Communication hole (opening for fluid introduction) 30 staters 30c Top surface (seat surface) 31-33 Long groove 50 rotors 50c Bottom surface (contact surface) 51, 52 Through holes 53~55 Communication groove 80 Drive Unit 100 Fluid circuit A,B load A1 One side of the region A2 The other side of the region C1, C2 Compressors Ports P1-P3, P8 P4~P7 Derivation Ports R1~R4 channel S1 space T1~T8 Fluid pipe V-type switching valve

Claims

1. The system comprises a stator having a seating surface, a case sealed and connected to the stator, and a rotor having a contact surface that abuts the seating surface and positioned between the stator and the case, The rotor is driven to rotate between a first rotation position relative to the stator, a second rotation position rotated to one side from the first rotation position, and a third rotation position rotated to the other side from the first rotation position, and the rotor is configured to have different flow path patterns at the first rotation position, the second rotation position, and the third rotation position of the rotor, in a switching valve. The stator is provided with multiple inlet ports and outlet ports through which the working fluid passes. The rotor is provided with at least two through holes and a communication groove that allows selective communication between the inlet port and the outlet port. The case is provided with openings for introducing fluid, which are in communication with each of the through holes. A switching valve in which at least one of the through holes is always in communication with one of the outlet ports within the rotation range of the rotor.

2. The switching valve according to claim 1, wherein the sum of the opening areas of the plurality of through holes communicating with the lead port is constant within the rotation range of the rotor.

3. The switching valve according to claim 1 or 2, wherein each of the input ports is always in communication with one of the output ports within the rotation range of the rotor.

4. The switching valve according to claim 3, wherein each of the introduction ports has a constant opening area communicating with the outlet port within the rotation range of the rotor.

5. In the stator, with reference to a virtual line passing through the center of the stator, the region on one side is provided with the derivation port that can communicate with the through hole, The switching valve according to claim 3, wherein in the stator, two or more sets of the lead-out ports and the introduction ports are provided in the region on the other side with respect to the virtual line.

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