JP2024032635A - Flow path switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow path switching device capable of improving the welding strength of each plate-like member to a driving member formed by layering the plurality of plate-like members.

SOLUTION: In one aspect of the disclosure, a flow path switching device 1 includes a valve element 12 formed with a first disc member 41 and a second disc member 42 layered, each of the first disc member 41 and the second disc member 42 being a resin member on which part of a valve element communication path 31 is formed, the first disc member 41 having an upper face 41a in which an opening part 32 of the valve element communication path 31 and a peripheral seal groove 33 formed around the opening part 32 are provided. In viewing the valve element 12 from the upper face 41a side of the first disc member 41, a laser welding part 51 for welding the first disc member 41 and the second disc member 42 to each other is provided at the position of the seal groove 33.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a flow path switching device that switches a flow path.

Patent Document 1 discloses a flow path switching device that includes a rotating disk and a fixed disk as a valve body provided inside a housing. In this flow path switching device, the rotating disk rotates around the rotation axis to open and close the communicating path of the fixed disk, thereby switching the flow path.

JP2022-21966A

In a flow path switching device as disclosed in Patent Document 1, when a seal member is provided between a rotating disk and a fixed disk, there is a risk that the seal member will be worn out by sliding when switching the flow path.

Therefore, the present disclosure has been made to solve the above-mentioned problems, and an object thereof is to provide a flow path switching device that can suppress sliding wear of a seal member that seals a flow path when switching the flow path. shall be.

One form of the present disclosure made to solve the above problem is a flow path switching device including a housing and a valve body provided inside the housing, the valve body having a plate shape. The housing includes a plurality of housing communication passages, the valve body includes at least one valve body communication passage, and the housing communication passage and the valve body communication passage are combined, A first sealing member is provided between the housing and the valve body to seal the flow passage, and a housing protrusion is provided on a surface of the housing facing the valve body. A valve body convex portion is provided on a surface of the valve body facing the housing, and when the valve body is driven to switch the flow path, the housing convex portion and the valve body convex portion are connected to each other. are overlapped to enlarge a first gap between the housing and the valve body.

According to this aspect, by enlarging the first gap when switching the flow path, it is possible to bring the first seal member out of contact with the housing or to reduce the surface pressure of the first seal member. Therefore, sliding wear of the first seal member can be suppressed. Furthermore, it is possible to prevent the first seal member from coming off a predetermined position due to sliding resistance.

In the above aspect, it is preferable that at least one of the housing convex part and the valve body convex part has a slit formed in the convex tip surface thereof.

According to this aspect, by forming the slit, when the liquid flows through the flow path, when switching the flow path, the liquid is interposed between the overlapping housing convex portion and the valve body convex portion, and the housing convex portion The sliding resistance generated between the valve body and the valve body convex portion can be reduced.

In the above aspect, it is preferable that the slit is formed to intersect with the direction in which the valve body is driven.

According to this aspect, the liquid can be interposed between the housing convex part and the valve body convex part, and the sliding resistance generated between the housing convex part and the valve body convex part can be reduced more reliably.

In the above aspect, it is preferable that the valve body is a plate-shaped drive disk, and that the drive disk is formed in a disk shape and driven to rotate.

According to this aspect, by rotationally driving the drive disk, the flow path can be reliably formed by changing the combination of the housing communication path and the valve body communication path.

In the above aspect, it is preferable that when the drive disk is rotationally driven to switch the flow path, the housing convex portion and the valve body convex portion begin to overlap from a position on the inner diameter side of the drive disk.

According to this aspect, when switching the flow path, the driving torque of the drive disk is suppressed from increasing rapidly, and the housing convex portion and the valve body convex portion are smoothly overlapped to enlarge the first gap. be able to.

In the above aspect, when the flow of fluid supplied to the flow path switching device is stopped, the housing convex portion and the valve body convex portion are overlapped to enlarge the first gap; is preferred.

According to this aspect, sticking and settling of the first sealing member can be suppressed, and the sealing performance of the first sealing member can be maintained.

In the above aspect, the valve body is a plate-shaped driving disk, and the valve body part includes a plate-shaped fixed disk in addition to the driving disk, and the driving disk and the fixed disk are connected to a shaft. The valve body communication passage is a drive disk communication passage that passes through the drive disk in the axial direction, and the fixed disk has a fixed disk communication passage that passes through the drive disk in the axial direction. Preferably, a plurality of passages are provided, and the flow passage is formed by combining the housing communication passage, the driving disk communication passage, and the fixed disk communication passage.

According to this aspect, the valve body portion is configured by arranging the plate-shaped driving disk and the plate-shaped fixed disk in a stacked manner in the axial direction. Therefore, the size of the flow path switching device can be made compact.

In the above aspect, a second sealing member for sealing the flow path is provided between the driving disk and the fixed disk, and a driving disk convex portion is provided on the surface of the driving disk facing the fixed disk. A fixed disk convex portion is provided on a surface of the fixed disk facing the driving disk, and when the driving disk is driven to switch the flow path, the driving disk convex portion and the fixed disk convex portion are provided with a fixed disk convex portion. preferably overlap with each other to enlarge a second gap between the drive disk and the stationary disk.

According to this aspect, by enlarging the second gap when switching the flow path, it is possible to bring the second seal member out of contact with the fixed disk or to reduce the surface pressure of the second seal member. Therefore, sliding wear of the second seal member can be suppressed. Furthermore, it is possible to prevent the second seal member from coming off a predetermined position due to sliding resistance.

In the above aspect, it is preferable that at least one of the driving disk convex part and the fixed disk convex part has a slit formed in the tip surface of the convex shape.

According to this aspect, when the liquid is caused to flow through the flow path by forming the slit, when switching the flow path, the liquid is interposed between the overlapping driving disk convex portion and fixed disk convex portion, and the driving disk The sliding resistance generated between the convex portion and the fixed disk convex portion can be reduced.

In the above aspect, it is preferable that the slit is formed to intersect with the direction in which the drive disk is driven.

According to this aspect, the liquid can be interposed between the driving disk convex part and the fixed disk convex part, and the sliding resistance generated between the driving disk convex part and the fixed disk convex part can be reduced more reliably. .

In the above aspect, it is preferable that the drive disk is formed in a disk shape and driven to rotate.

According to this aspect, by rotationally driving the drive disk, the flow path can be reliably formed by changing the combination of the housing communication path, the drive disk communication path, and the fixed disk communication path.

In the above aspect, a second sealing member for sealing the flow path is provided between the driving disk and the fixed disk, and a driving disk convex portion is provided on the surface of the driving disk facing the fixed disk. A fixed disk convex portion is provided on a surface of the fixed disk facing the driving disk, and when the driving disk is driven to switch the flow path, the driving disk convex portion and the fixed disk convex portion are provided with a fixed disk convex portion. overlap to enlarge the second gap between the driving disk and the fixed disk, and when the driving disk is rotationally driven to switch the flow path, the housing convex portion and the valve body convex portion, Preferably, the drive disk convex portion and the fixed disk convex portion begin to overlap from a position on the inner diameter side of the drive disk.

According to this aspect, when switching the flow path, the driving torque of the drive disk is prevented from increasing rapidly, and the housing convex portion and the valve body convex portion, and the driving disk convex portion and the fixed disk convex portion are smoothly connected. The first gap and the second gap can be enlarged by overlapping them.

In the above aspect, when the flow of fluid supplied to the flow path switching device is stopped, the housing convex portion and the valve body convex portion are overlapped to enlarge the first gap, and the first gap is enlarged. Preferably, the driving disk convex portion and the fixed disk convex portion are overlapped to enlarge the second gap.

According to this aspect, sticking and settling of the first sealing member can be suppressed, and the sealing performance of the first sealing member can be maintained. Furthermore, sticking and settling of the second seal member can be suppressed, and the sealing properties of the second seal member can be maintained.

In the above aspect, the valve body is a slide disk that is driven to slide in a predetermined direction, and the valve body communication path is a slide disk communication path provided in the slide disk, and is connected to the housing communication path. It is preferable that the flow path is formed by combining the slide disk communication path.

According to this aspect, the valve body portion is constituted by the slide disk. Therefore, the thickness of the flow path switching device can be reduced.

The above aspect includes a drive shaft that drives the slide disk to slide in the axial direction, and a shake absorption mechanism that suppresses the swing of the drive shaft in a direction perpendicular to the axial direction. preferable.

According to this aspect, since the drive shaft can be prevented from tilting in the axial direction by the runout absorption mechanism, wear of the bearing that supports the drive shaft can be suppressed, and the seal member provided between the bearing and the slide disk can be prevented from being worn out. Can maintain sealing performance.

In the above aspect, when the flow of fluid supplied to the flow path switching device is stopped, the housing convex portion and the valve body convex portion are overlapped to enlarge the first gap; is preferred.

According to this aspect, sticking and settling of the first sealing member can be suppressed, and the sealing performance of the first sealing member can be maintained.

In the above aspect, the valve body includes a valve body that forms the valve body, and a drive shaft that drives the valve body, and the valve convex portion is provided on the valve body. Preferably, the valve body body is engaged with the drive shaft portion in a movable direction in which the housing convex portion and the valve body convex portion overlap.

According to this aspect, the valve body body portion and the drive shaft portion are separated. Therefore, when moving the valve body body to enlarge the first gap, there is no need to move the drive shaft. Therefore, by reliably driving the drive shaft portion using the drive portion and moving the valve body portion, the first gap can be reliably expanded.

In the above aspect, it is preferable that the valve body convex portion is engaged with the valve body in a state in which it is movable in a direction in which it overlaps with the housing convex portion.

According to this aspect, it is possible to prevent the first gap from becoming too large when the housing convex portion and the valve body convex portion overlap when switching the flow path. Then, the first gap between the housing and the valve body can be reliably expanded.

Another form of the present disclosure made to solve the above problem is a flow path switching device including a housing and a valve body part provided inside the housing, the valve body part having a plate shape. The housing includes a plurality of housing communication passages, the valve body includes at least one valve body communication passage, and the housing communication passage and the valve body communication passage are combined. , which forms a flow path, and the valve body portion includes a plate-shaped first fixed disk, a plate-shaped driving disk serving as the valve body, and a plate-shaped second fixed disk, each having a plate thickness. A sealing member for sealing the flow path is provided between the first fixed disk and the driving disk and between the driving disk and the second fixed disk. a first fixed disk convex portion is provided on a surface of the first fixed disk facing the driving disk, and a first driving disk convex portion is provided on a surface of the driving disk facing the first fixed disk. a second driving disk convex portion is provided on a surface of the driving disk facing the second fixed disk, and a second driving disk convex portion is provided on a surface of the second fixed disk facing the driving disk. and an elastic member is provided between the housing and the first fixed disk and between the second fixed disk and the housing, and when the drive disk is driven to switch the flow path, The first fixed disk convex portion and the first drive disk convex portion overlap to enlarge the gap between the first fixed disk and the drive disk, and the second drive disk convex portion and the first drive disk convex portion overlap. It is characterized in that the two fixed disk convex portions overlap to enlarge the gap between the drive disk and the second fixed disk.

According to this aspect, the first fixed disk and the second fixed disk, which are movable by elastic members, are provided on both sides of the drive disk. As a result, even if the drive disk is tilted, the first fixed disk and the second fixed disk can be tilted so as to follow the tilt of the drive disk. Therefore, even if the drive disk is tilted, the sealing performance of the seal member can be ensured. Furthermore, the gap between the first fixed disk and the driving disk and the gap between the driving disk and the second fixed disk can be reliably enlarged.

In the above aspect, the valve body is a plate-shaped driving disk, and the valve body part includes a plate-shaped fixed disk in addition to the driving disk, and the driving disk and the fixed disk are connected to a shaft. The driving disks include a disk portion and a rotating shaft portion that rotates the disk portion, and the center portion of the disk portion is aligned with the housing in the axial direction. Preferably, it is supported on both sides by the fixed disk.

According to this aspect, since the central portion of the disk portion is supported on both ends in the axial direction, it is possible to suppress the central portion of the disk portion from being tilted, and thereby suppress the tilting of the rotating shaft portion. Therefore, the flow path can be switched stably by rotating the disc part using the rotating shaft part.

In the above aspect, the housing convex portion and the valve body convex portion each include a gentle slope portion and a steep slope portion, and when the housing convex portion and the valve body convex portion overlap, the gentle slope portions touch each other. It is preferable that the steep slope portions contact each other after the contact occurs.

According to this aspect, when the housing convex portion and the valve body convex portion begin to overlap when the valve body is driven to switch the flow path, the gentle slope portion of the housing convex portion and the gentle slope portion of the valve body convex portion are The housing convex portion and the valve body convex portion come into surface contact with each other. Therefore, when the housing protrusion and the valve body protrusion begin to overlap, stress from the valve body protrusion can be prevented from acting concentratedly on the housing protrusion. Therefore, it becomes easier to drive the valve body, so the drive unit that drives the valve body can be downsized, and the flow path can be switched stably.

According to the flow path switching device of the present disclosure, it is possible to suppress sliding wear of the seal member that seals the flow path when switching the flow path.

FIG. 2 is an external perspective view of the flow path switching device (in the case of a hexagonal valve) of the first embodiment. It is an exploded perspective view of the flow path switching device of a 1st embodiment (illustration of a drive part is omitted). It is a sectional view of the flow path switching device of a 1st embodiment (illustration of a drive part is omitted). FIG. 3 is a top view of the rotating disk. FIG. 3 is a top view of the fixed disk. FIG. 3 is a diagram when the housing is viewed from above, and shows a state in which a first flow path pattern is formed. FIG. 6 is a diagram when the housing is viewed from above, and shows a state in which a second flow path pattern is formed. FIG. 7 is a sectional view taken along the line AA in FIG. 6 in the first and second embodiments. FIG. 7 is a sectional view taken along line BB in FIG. 6 in the first and second embodiments. FIG. 6 is a diagram when the housing is viewed from above in the first and second embodiments, and is a diagram showing the positions where the convex portions are arranged. FIG. 9 is a diagram corresponding to FIG. 8 in the first and second embodiments, and is a diagram illustrating when the flow path is switched. FIG. 10 is a diagram corresponding to FIG. 9 in the first and second embodiments, and is a diagram showing when the flow path is switched. FIG. 9 is a diagram corresponding to FIG. 8 in the first and second embodiments, and is a diagram illustrating after switching the flow paths. 10 is a diagram corresponding to FIG. 9 in the first and second embodiments, and is a diagram illustrating a state after switching the flow path. FIG. It is a figure which shows the slit in 3rd Example. FIG. 7 is a diagram showing that the slits intersect with the rotational driving direction of the rotating disk in the fourth embodiment. FIG. 7 is a diagram showing a housing convex portion and a rotating disk upper surface convex portion in a fifth embodiment. FIG. 7 is a diagram showing a comparative example in the fifth example. FIG. 12 is a view when the housing is viewed from above in the sixth embodiment, and is a diagram showing that the housing convex portion and the rotary disk upper surface convex portion begin to overlap from a position on the inner diameter side of the rotary disk. FIG. 7 is a sectional view of a sealing member in a seventh embodiment. It is a figure which shows the seal groove of the rotating disk in 7th Example. FIG. 7 is a diagram showing a housing convex portion and a convex portion on the upper surface of the rotating disk (when the rotating disk is stopped) in the eighth embodiment. FIG. 12 is a diagram showing a housing convex portion and a convex portion on the upper surface of the rotary disk (when the rotary disk is rotationally driven to switch the flow path) in the eighth embodiment. FIG. 9 is a diagram showing that the housing convex portion also serves to restrict the amount of deformation of the first seal member in the eighth embodiment. FIG. 12 is a diagram when the housing is viewed from above in the ninth embodiment. FIG. 9 is a diagram showing a first housing convex portion and a first rotary disk upper surface convex portion in a ninth embodiment. FIG. 9 is a diagram showing a second housing convex portion and a second rotary disk upper surface convex portion in the ninth embodiment. FIG. 12 is a flowchart showing the details of control performed in the tenth embodiment. FIG. 12 is a flowchart showing the details of control performed in the tenth embodiment. It is a figure which shows the flow path switching device of 2nd Embodiment, and is a figure which shows when the flow path of A pattern is formed. 31 is a sectional view taken along the line CC in FIG. 30. FIG. It is a figure which shows the flow path switching device of 2nd Embodiment, and is a figure which shows when the flow path of B pattern is formed. 31 is an enlarged view of a portion of the cross section taken along line DD in FIG. 30, showing a state in which the A-pattern and B-pattern flow paths are formed and the slide valve is stopped; FIG. 31 is an enlarged view of a portion of the DD cross section in FIG. 30, showing a state in which the slide valve is sliding in order to switch the flow path. FIG. FIG. 32 is a diagram corresponding to FIG. 31 and showing a case where the slide valve communication passage is formed into a hollow shape. FIG. 7 is a diagram showing that the seal member can be attached from the outside after the slide valve is assembled into the housing. FIG. 3 is a diagram showing a shake absorption mechanism. FIG. 3 is a diagram showing the shake absorption mechanism, and is a diagram showing a case where the drive shaft is tilted. FIG. 6 is a diagram showing how the first seal member crosses the flow path opening of the inflow flow path. It is a sectional view of a flow path switching device of a 3rd embodiment (illustration of a drive part is omitted). 41 is a sectional view taken along line EE in FIG. 40. FIG. FIG. 7 is an enlarged cross-sectional view showing a convex portion on the upper surface of the rotating disk, a convex portion on the lower surface of the rotary disk, and their surroundings in the fourth embodiment. It is a sectional view of a flow path switching device of a 5th embodiment (illustration of a drive part is omitted). It is a sectional view of a flow path switching device of a 6th embodiment (illustration of a drive part is omitted). It is a sectional view of a channel switching device of a 7th embodiment (illustration of a drive part is omitted). FIG. 7 is an enlarged cross-sectional view of a fixed disk convex portion, a rotary disk upper surface convex portion, a rotary disk lower surface convex portion, and their surroundings in a seventh embodiment. It is a figure which shows that a housing may swell due to fluid pressure. FIG. 6 is a diagram illustrating a countermeasure against the housing swelling due to fluid pressure. FIG. 6 is a diagram illustrating a countermeasure against the housing being swollen due to fluid pressure. FIG. 11 is a cross-sectional view showing that the gentle slope portion of the housing convex portion and the gentle slope portion of the rotary disk upper surface convex portion are in contact with each other in the eighth embodiment. FIG. 11 is a cross-sectional view showing that a steep slope portion of a housing convex portion and a steep slope portion of a rotary disk upper surface convex portion are in contact with each other in the eighth embodiment. FIG. 11 is a cross-sectional view showing that the spherical surface of the housing convex portion and the gentle slope portion of the rotary disk upper surface convex portion are in contact with each other in the eighth embodiment. FIG. 11 is a cross-sectional view showing that the flat portion of the housing convex portion and the flat portion of the upper surface convex portion of the rotary disk are in contact with each other in the eighth embodiment. FIG. 11 is a cross-sectional view showing that the spherical surface of the housing convex portion and the gentle slope portion of the rotary disk upper surface convex portion are in contact with each other in the eighth embodiment. FIG. 11 is a cross-sectional view showing that a steep slope portion of a housing convex portion and a steep slope portion of a rotary disk upper surface convex portion are in contact with each other in the eighth embodiment. FIG. 11 is a cross-sectional view showing that the gentle slope portion of the housing convex portion and the gentle slope portion of the rotary disk upper surface convex portion are in contact with each other in the eighth embodiment. FIG. 12 is a diagram showing an example in which the housing convex portion includes a gentle slope portion instead of a spherical portion in the eighth embodiment.

A flow path switching device that is an embodiment of the present disclosure will be described.

<First embodiment>
First, a first embodiment will be described.

(Explanation of the overall outline of the flow path switching device)
First, the overall outline of the flow path switching device 1 of this embodiment will be explained.

As shown in FIGS. 1 to 3, the flow path switching device 1 includes a housing 11, a valve body portion 12, a drive portion 13, and a control portion 14.

The housing 11 includes an inflow channel 20 through which fluid flows and an outflow channel 30 through which fluid flows out. Here, the flow path switching device 1 is a hexagonal valve as an example, and the housing 11 includes three inlet flow paths 20 and three outflow flow paths 30. As the three inflow channels 20, a first inflow channel 21, a second inflow channel 22, and a third inflow channel 23 are provided. Further, as the three outflow channels 30, a first outflow channel 31, a second outflow channel 32, and a third outflow channel 33 are provided. Note that the housing 11 is made of resin, for example. Further, the inflow channel 20 is an example of a "housing communication channel" of the present disclosure.

The valve body portion 12 is provided inside the housing 11. As shown in FIGS. 2 and 3, the valve body portion 12 includes a plate-shaped rotating disk 40 that is rotationally driven and a plate-shaped fixed disk 50. The rotating disk 40 and the fixed disk 50 are stacked and arranged in the central axis direction (hereinafter simply referred to as "axial direction") of a disk portion 41 of the rotating disk 40 and a disk portion 51 of the fixed disk 50, which will be described later. has been done.

Note that the rotating disk 40 is an example of a "valve body" or a "driving disk" of the present disclosure. Further, the rotating disk 40 and the fixed disk 50 are made of resin, for example.

As shown in FIGS. 2 to 4, the rotating disk 40 includes a disk portion 41 and a rotating shaft portion 42. As shown in FIGS.

The disk portion 41 is formed into a disk shape and includes a rotating disk communication passage 60 that passes through it in the axial direction. Here, the disk portion 41 includes three rotating disk communication paths 60. As shown in FIGS. 2 and 4, the three rotating disk communicating paths 60 include a first rotating disk communicating path 61, a second rotating disk communicating path 62, and a third rotating disk communicating path 63. Note that the rotating disk communication path 60 is an example of a "valve body communication path" or a "drive disk communication path" in the present disclosure.

The rotating shaft section 42 is connected to the disk section 41 at one end in the direction of its central axis, and connected to the drive section 13 at the other end. The rotating shaft portion 42 is provided at the center of the disk portion 41 so that its central axis coincides with the center axis of the disk portion 41 . When the rotating shaft section 42 obtains rotational power from the drive section 13 and rotates around the central axis, the disk section 41 connected to the rotating shaft section 42 rotates around the central axis. In this way, the rotating disk 40 rotates about the central axis by receiving rotational power from the drive unit 13.

As shown in FIGS. 2, 3, and 5, the fixed disk 50 includes a disk portion 51 and a cylindrical portion 52.

The disk portion 51 is formed into a disk shape and includes a fixed disk communication passage 70 that passes through the disk portion 51 in the axial direction. Here, the disc portion 51 includes three fixed disc communication paths 70. As shown in FIGS. 2 and 5, the three fixed disk communication paths 70 include a first fixed disk communication path 71, a second fixed disk communication path 72, and a third fixed disk communication path 73.

The cylindrical portion 52 is connected to the disk portion 51 and is formed to extend in the axial direction from the disk portion 51 so as to surround the fixed disk communication path 70 . Here, three cylindrical portions 52 are formed to correspond to each of the three fixed disk communication paths 70.

The drive section 13 includes a motor (not shown) for providing rotational power to the rotating shaft section 42 of the rotating disk 40.

The control unit 14 includes, for example, a CPU and a memory such as a ROM or a RAM, and controls the flow path switching device 1 according to a program stored in the memory in advance.

The flow path switching device 1 configured as described above forms a flow path by combining the inflow flow path 20, the rotating disk communication path 60, and the fixed disk communication path 70. Then, the flow path switching device 1 rotates the rotary disk 40 by the drive unit 13 to provide three inflow flow paths 20, three rotary disk communication paths 60, three fixed disk communication paths 70 (three outflow flow paths). 30) The flow path is switched by changing the combination of communicating.

For example, as shown in FIG. 6, the first flow path pattern includes a first rotating disk communication path 61 communicating with the first inflow path 21 and a first fixed disk communication path communicating with the first outflow path 31. By communicating with the passage 71, it is possible to form a flow path that allows the first inflow flow path 21 and the first outflow flow path 31 to communicate with each other. Further, by communicating the second rotating disk communication path 62 communicating with the second inflow path 22 and the second fixed disk communication path 72 communicating with the second outflow path 32, the second inflow path 22 and the second outflow channel 32 can be formed. Further, by communicating the third rotating disk communication path 63 communicating with the third inflow path 23 and the third fixed disk communication path 73 communicating with the third outflow path 33, the third inflow path 23 and the third outflow channel 33 can be formed.

Furthermore, the state of the first flow path pattern shown in FIG. 6 can be switched to the second flow path pattern shown in FIG. 7 by rotationally driving the rotary disk 40 by the drive unit 13. That is, as shown in FIG. 7, the second flow path pattern includes a first rotating disk communication path 61 communicating with the third inflow path 23 and a first fixed disk communication path communicating with the first outflow path 31. By communicating with the passage 71, it is possible to form a flow path that allows the third inflow flow path 23 and the first outflow flow path 31 to communicate with each other. Furthermore, by communicating the second rotating disk communication path 62 that communicates with the first inflow path 21 and the second fixed disk communication path 72 that communicates with the second outflow path 32, the first inflow path 21 and the second outflow channel 32 can be formed. Further, by communicating the third rotating disk communication path 63 communicating with the second inflow path 22 and the third fixed disk communication path 73 communicating with the third outflow path 33, the second inflow path 22 and the third outflow channel 33 can be formed.

Note that the flow path switching device 1 is not limited to a six-way valve, but may also be other multi-way valves such as a three-way valve or a four-way valve. Therefore, the rotating disk 40 only needs to have at least one rotating disk communication path 60, and the fixed disk 50 only needs to have a plurality of fixed disk communication paths 70.

In this embodiment, in the axial direction, there is elasticity between the housing 11 and the rotating disk 40, between the rotating disk 40 and the fixed disk 50, and between the fixed disk 50 and the housing 11. A member is provided.

Specifically, as shown in FIG. 3, a first seal member 81A is provided as an elastic member between the upper surface 11a of the housing 11 and the upper surface 41a of the disk portion 41 of the rotating disk 40. Further, a second seal member 81B is provided as an elastic member between the lower surface 41b of the disk portion 41 on the rotating disk 40 and the upper surface 51a of the disk portion 51 on the fixed disk 50.

The first sealing member 81A and the second sealing member 81B are arranged in a circumferential shape so as to surround the periphery of the rotary disk communication passage 60 formed in the shape of a long hole on the upper surface 41a and lower surface 41b of the disc portion 41 of the rotary disk 40. is formed. The first seal member 81A and the second seal member 81B seal the flow path and prevent fluid from leaking from the rotating disk communication path 60 forming a part of the flow path.

Note that the first seal member 81A and the second seal member 81B are made of, for example, fluororesin (eg, Teflon (registered trademark)). Further, the first seal member 81A and the second seal member 81B may be formed of rubber to which a fluororesin is applied. Furthermore, the first seal member 81A and the second seal member 81B may be formed of a material other than fluororesin or rubber.

Further, a disk holding spring 82 is provided as an elastic member between the lower surface 51b of the disk portion 51 of the fixed disk 50 and the lower surface 11b of the housing 11. A total of three disc retaining springs 82 are provided, each being disposed on each of the three cylindrical portions 52 of the fixed disc 50. Note that the three disk holding springs 82 are provided at equal intervals from each other. Further, the three disk retaining springs 82 may be arranged at positions between each of the three cylindrical portions 52. Furthermore, four or more disk holding springs 82 may be provided.

Furthermore, a lip seal 83 is provided between the cylindrical portion 52 of the fixed disk 50 and the housing 11 to ensure the sealing performance of the fixed disk communication path 70.

In this way, by providing an elastic member between the housing 11, the rotating disk 40, and the fixed disk 50 in the axial direction, the rotating disk 40 and the fixed disk 50 are supported by the elastic member.

Further, the valve body portion 12 is configured by arranging a rotating disk 40 having a substantially disk shape and a stationary disk 50 having a substantially disk shape in a stacked manner in the axial direction. Therefore, the size of the flow path switching device 1 can be made compact.

(Measures against sliding wear of seal members and related technologies)
When the rotary disk 40 is rotationally driven to switch the flow path (hereinafter simply referred to as "when switching the flow path"), the first seal member 81A closes the flow path opening of the inflow flow path 20, as shown in FIG. cross. At this time, stress may be concentrated on the portion of the first seal member 81A that is in contact with the inflow channel 20 (specifically, the edge of the inflow channel 20), or the first seal member 81A may be in contact with the inflow channel 20. There is a risk of getting caught.

Further, the housing 11, the rotating disk 40, and the fixed disk 50 are made of resin. Therefore, the upper surface 11a and the like of the housing 11 (the upper surface 11a and the lower surface 11b of the housing 11, the upper surface 41a and the lower surface 41b of the disk part 41 of the rotating disk 40, the upper surface 51a and the lower surface 51b of the fixed disk 50 (of the disk part 51)) ), but due to swelling etc., it is difficult to maintain it in a flat state at all times. Therefore, in order to maintain the sealing performance of the first seal member 81A and the second seal member 81B, the surface pressure of the first seal member 81A and the second seal member 81B (that is, the upper surface 11a and lower surface 11b of the housing 11, the fixed disc It is necessary to increase the pressure applied to the upper surface 51a and lower surface 51b of 50.

For this reason, when switching the flow paths, the first seal member 81A and the second seal member 81B may be attached to the flow path opening of the inflow flow path 20, the upper surface 11a or lower surface 11b of the housing 11, or the upper surface 51a of the fixed disk 50. There is a risk of sliding on the lower surface 51b and wear (that is, sliding wear).

Therefore, in this embodiment, as a countermeasure against sliding wear of the first seal member 81A and the second seal member 81B and related technology, the following examples are performed.

(First example)
In this embodiment, when switching the flow path, the gap between the housing 11, the rotating disk 40, and the fixed disk 50 (ie, a first gap δ1 and a second gap δ2, which will be described later) is enlarged. As a result, when switching the flow path, the first seal member 81A and the second seal member 81B are brought out of contact with the upper surface 11a of the housing 11 and the upper surface 51a of the fixed disk 50, or the first seal member The surface pressure of the seal member 81A and the second seal member 81B is reduced.

Specifically, as shown in FIG. 9, a housing convex portion 91 is provided on the upper surface 11a of the housing 11 (the surface facing the upper surface 41a (of the disk portion 41) of the rotating disk 40). As shown in FIG. 10, the housing convex portions 91 are provided in plurality (here, three) and are evenly arranged in the direction in which the rotary disk 40 is rotationally driven.

Further, as shown in FIG. 9, a rotating disk upper surface convex portion 92 is provided on the upper surface 41a (of the disk portion 41) of the rotating disk 40 (the surface facing the upper surface 11a of the housing 11). As shown in FIG. 10, the rotating disk upper surface convex portions 92 are provided in plurality (here, three) and are evenly arranged in the direction in which the rotating disk 40 is rotationally driven. Note that the rotating disk upper surface convex portion 92 is an example of the “valve body convex portion” of the present disclosure.

Then, when the rotating disk 40 is rotationally driven to switch the flow path from the state shown in FIG. 8 as shown in FIG. 11, the housing convex portion 91 and the rotating disk upper surface convex portion 92 overlap as shown in FIG. . Thereby, as shown in FIG. 11, the first gap δ1 formed between the upper surface 11a of the housing 11 and the upper surface 41a of the rotary disk 40 is enlarged compared to that in FIG. 8.

In this way, when switching the flow path, by enlarging the first gap δ1, the first seal member 81A is brought out of contact with the upper surface 11a of the housing 11, or the surface of the first seal member 81A is pressure can be reduced. Therefore, when the first seal member 81A slides on the upper surface 11a of the housing 11 or the flow path opening of the inflow flow path 20, it is possible to suppress sliding wear of the first seal member 81A. Furthermore, it is possible to prevent the first seal member 81A from coming off a predetermined position due to sliding resistance received from the upper surface 11a of the housing 11 or the flow path opening of the inflow flow path 20.

Further, as shown in FIG. 9, a rotating disk lower surface convex portion 93 is provided on the lower surface 41b (of the disk portion 41) of the rotating disk 40 (that is, the surface facing the upper surface 51a of the fixed disk 50). . Similar to the above-mentioned rotary disk upper surface convex portion 92, a plurality (here, three) of the rotary disk lower surface convex portions 93 are provided, and they are arranged evenly in the direction in which the rotary disk 40 is rotationally driven. Note that the rotating disk lower surface convex portion 93 is an example of the “driving disk convex portion” of the present disclosure.

Further, as shown in FIG. 9, a fixed disk convex portion 94 is provided on the upper surface 51a (of the disk portion 51) of the fixed disk 50 (that is, the surface facing the lower surface 41b of the rotating disk 40). Similar to the housing protrusion 91 described above, a plurality of fixed disk convex portions 94 (in this case, three) are provided and are equally arranged in the direction in which the rotary disk 40 is rotationally driven.

Then, when the rotating disk 40 is rotationally driven to switch the flow path from the state shown in FIG. 8 as shown in FIG. overlap. Thereby, as shown in FIG. 11, the second gap δ2 formed between the lower surface 41b of the rotating disk 40 and the upper surface 51a of the fixed disk 50 is expanded.

In this way, when switching the flow path, by enlarging the second gap δ2, the second seal member 81B is brought out of contact with the upper surface 51a of the fixed disk 50, or the second seal member 81B is Surface pressure can be reduced. Therefore, when the second seal member 81B slides on the upper surface 51a of the fixed disk 50, sliding wear of the second seal member 81B can be suppressed. Further, it is possible to prevent the second seal member 81B from coming off the predetermined position due to the sliding resistance received from the upper surface 51a of the fixed disk 50.

Note that after switching the flow paths as shown in FIG. 13, as shown in FIG. 94, there is no overlap. Thereby, the sealing properties of the first seal member 81A and the second seal member 81B can be ensured.

Further, the positions where the housing convex portion 91, the rotary disk upper surface convex portion 92, the rotary disk lower surface convex portion 93, and the fixed disk convex portion 94 are provided are positions on the inner diameter side of the rotary disk communication path 60, as shown in FIG. The position is not limited to one, and may be a position on the outer diameter side of the rotating disk communication path 60 or a position between two adjacent rotating disk communication paths 60.

Further, the widths of the housing convex portion 91 and the rotary disk upper surface convex portion 92, as well as the rotary disk lower surface convex portion 93 and the fixed disk convex portion 94 in the direction in which the rotary disk 40 is rotationally driven, are uniform even if they are different. There may be. Note that when the widths are different, it is desirable to increase the width of the one with lower rigidity from the viewpoint of stress relaxation. In the example shown in FIG. 10, the width of the housing convex portion 91 in the direction in which the rotary disk 40 is rotationally driven is larger than that of the convex portion 92 on the upper surface of the rotary disk.

(Second example)
In this embodiment, as shown in FIG. 9, a seal deformation amount regulating convex portion 95 is provided on the upper surface 11a of the housing 11 and the upper surface 51a of the fixed disk 50.

As a result, when the flow path is not switched (that is, when the rotating disk 40 is stopped, as shown in FIG. By contacting them, the amount of deformation of the first seal member 81A and the second seal member 81B can be regulated. Therefore, the surface pressure of the first sealing member 81A and the second sealing member 81B can be adjusted to a desired pressure or less so as not to become excessive. Moreover, when the first seal member 81A and the second seal member 81B become soft due to temperature rise, the amount of deformation of the first seal member 81A and the second seal member 81B can be controlled.

Note that the seal deformation amount regulating convex portion 95 may be provided on the upper surface 41a or the lower surface 41b of the rotating disk 40.

(Third example)
In this embodiment, a slit 96 (see FIG. 15) is formed in the tip end surface of at least one (that is, both or one) of the housing convex portion 91 and the rotary disk upper surface convex portion 92. Note that when forming the slit 96 in one of the housing convex portion 91 and the rotary disk upper surface convex portion 92, the slit 96 should be formed in the one with the larger width in the direction in which the rotary disk 40 is rotationally driven (in the example shown in FIG. 10, the housing convex portion It is desirable to form a slit 96 in the slit 91).

In this way, by forming the slit 96, when the liquid flows through the flow path, when switching the flow path, the liquid is interposed between the overlapping housing convex portion 91 and the rotating disk upper surface convex portion 92, The sliding resistance generated between the housing convex portion 91 and the rotary disk upper surface convex portion 92 can be reduced.

Furthermore, by forming the slit 96, the contact area between the housing convex portion 91 and the rotating disk upper surface convex portion 92 becomes smaller, so that the sliding that occurs between the housing convex portion 91 and the rotating disk upper surface convex portion 92 is reduced. Can reduce resistance.

Further, by forming the slit 96, even if a foreign object should become caught between the housing convex portion 91 and the rotary disk upper surface convex portion 92, the foreign object can be removed through the slit 96.

Similarly, a slit 96 is formed in at least one of the rotary disk lower surface convex portion 93 and the fixed disk convex portion 94 at the tip end surface of the convex shape.

By forming the slit 96 in this manner, the sliding resistance generated between the rotating disk lower surface convex portion 93 and the fixed disk convex portion 94 can be reduced, similar to the housing convex portion 91 and the rotating disk upper surface convex portion 92. Even if foreign matter were to be caught between the rotating disk lower surface convex portion 93 and the stationary disk convex portion 94, the foreign matter could be removed through the slit 96.

(Fourth example)
In this embodiment, as shown in FIG. 16, the slit 96 is formed to intersect the direction in which the rotating disk 40 is rotationally driven (the "rotational driving direction" in the figure).

As a result, liquid is supplied from the slit 96 between the overlapping housing convex portion 91 and the rotary disk upper surface convex portion 92 even at a rear position in the direction in which the rotary disk 40 is rotationally driven. Therefore, the liquid can be more reliably interposed between the housing convex portion 91 and the rotating disk upper surface convex portion 92, and the sliding resistance generated between the housing convex portion 91 and the rotating disk upper surface convex portion 92 can be reduced. . Similarly, liquid can be interposed between the rotating disk lower surface convex part 93 and the fixed disk convex part 94 to more reliably prevent the sliding occurring between the rotary disk lower surface convex part 93 and the fixed disk convex part 94. Dynamic resistance can be reduced.

Further, since the slit 96 is formed to intersect with the direction in which the rotating disk 40 is rotationally driven, even if the foreign object moves in the direction in which the rotating disk 40 is rotationally driven, it will cross the slit 96. can be reliably removed through

(Fifth example)
In this embodiment, as shown in FIG. 17, the housing convex portion 91 is connected to the upper surface 11a of the housing 11 on both end surfaces of the housing convex portion 91 in the direction in which the rotary disk 40 is rotationally driven (left-right direction in FIG. 17). A large R-shaped portion 91a having a large diameter is formed at the boundary portion of the curve. Further, the rotating disk upper surface convex portion 92 has a boundary portion with the tip surface (the upper surface in FIG. 17) on both end surfaces of the rotating disk upper surface convex portion 92 in the direction in which the rotating disk 40 is rotationally driven (the left-right direction in FIG. 17). A small rounded portion 92a having a small radius is formed in the portion 92a. Note that a tapered portion may be formed instead of the large radius portion 91a and the small radius portion 92a.

As a result, as shown in FIG. 17, the increase in the driving torque of the rotating disk 40 when the housing convex portion 91 and the rotating disk upper surface convex portion 92 begin to overlap is suppressed compared to the case of the comparative example shown in FIG. be done. Note that the comparative example in FIG. 18 is an example in which the large radius portion 91a and the small radius portion 92a are not formed.

That is, in the comparative example shown in FIG. 18, at the same time that the housing convex portion 91 and the rotary disk upper surface convex portion 92 begin to overlap, the housing 11 pushes the rotary disk 40 downward at once, so that the driving torque of the rotary disk 40 is reduced. rise rapidly. On the other hand, in the present embodiment shown in FIG. 17, at the same time that the housing convex portion 91 and the rotary disk upper surface convex portion 92 begin to overlap, the rotary disk 40 moves downward from the large radius portion 91a and the small radius portion 92a. Since it is gradually pushed down, an increase in the driving torque of the rotating disk 40 can be suppressed. Note that this embodiment does not deny the adoption of the comparative example shown in FIG. 18, and may be adopted as an example.

Note that this embodiment can be similarly applied to the rotating disk lower surface convex portion 93 and the fixed disk convex portion 94.

(6th example)
In this embodiment, when the rotary disk 40 is rotationally driven to switch the flow path, the housing convex portion 91 and the rotary disk upper surface convex portion 92 are located at the inner diameter side of the rotary disk 40 (in the figure), as shown in FIG. They begin to overlap from the "ground contact starting point" of 2), and then gradually begin to overlap toward the outer diameter side of the rotating disk 40. At this time, for example, the heights and widths of the housing convex portion 91 and the rotary disk upper surface convex portion 92 in the rotation driving direction of the rotary disk 40 may be adjusted so that the housing convex portion 91 and the rotary disk upper surface convex portion 92 are aligned with the rotating disk 40. so that they start to overlap from the inner diameter side.

Thereby, when the housing convex portion 91 and the rotary disk upper surface convex portion 92 overlap when switching the flow path, the driving torque of the rotary disk 40 can be gradually increased. Therefore, the driving torque of the rotary disk 40 is prevented from increasing rapidly, and the housing convex portion 91 and the rotary disk upper surface convex portion 92 overlap smoothly, thereby expanding the first gap δ1.

Similarly, when rotating the rotating disk 40 to switch the flow path, the rotating disk lower surface convex portion 93 and the fixed disk convex portion 94 also start to overlap from the position on the inner diameter side of the rotating disk 40, and then the rotating disk 40 starts to overlap. They may gradually begin to overlap toward the outer diameter side of the disk 40.

(Seventh Example)
In this embodiment, the first seal member 81A and the second seal member 81B are integrally formed at least in part in the circumferential direction as shown in FIG. 20. At this time, for example, as shown in FIG. 21, a seal groove 97 (that is, a groove for arranging the first seal member 81A and the second seal member 81B) provided on the upper surface 41a and the lower surface 41b of the rotating disk 40 is A plurality of through holes 98 (that is, holes penetrating the rotating disk 40) are provided. Then, the first seal member 81A and the second seal member 81B are integrally molded with the rotating disk 40 (for example, by integral injection molding) so that the first seal member 81A and the second seal member 81B are connected at the through hole 98. do.

As a result, when the rotary disk 40 is rotationally driven to switch the flow path, the first seal member 81A and the second seal member 81B are attached to the upper surface 11a of the housing 11, the flow path opening of the inflow flow path 20, and the upper surface of the fixed disk 50. 51a, or the first gap δ1 and the second gap δ2 expand, and the first seal member 81A and the second seal member 81B close to the upper surface 11a of the housing 11 and the inflow channel 20. Even if the first seal member 81A and the second seal member 81B do not come into contact with the flow path opening or the upper surface 51a of the fixed disk 50, it becomes difficult for the first seal member 81A and the second seal member 81B to separate from the seal groove 97 of the rotary disk 40. Therefore, even after switching the flow path, the sealing performance of the first seal member 81A and the second seal member 81B can be ensured.

(Eighth example)
In this embodiment, the height H1 of the housing convex portion 91 and the height H2 of the rotary disk upper surface convex portion 92 are different. For example, the height H1 of the housing convex portion 91 is made larger than the height H2 of the rotating disk upper surface convex portion 92.

As a result, when the rotating disk 40 is not stopped and the flow path is not switched, the state shown in FIG. 22 is achieved. When the rotary disk 40 is rotationally driven to switch the flow path, the state shown in FIG. 23 is reached. At this time, since the height H2 of the rotating disk upper surface convex part 92 is smaller than the height H1 of the housing convex part 91, the amount by which the rotating disk upper surface convex part 92 is pushed down by the housing convex part 91 becomes smaller. Drive torque can be reduced.

Furthermore, when the rotary disk 40 is not stopped and the flow path is not switched, the housing convex portion 91 can also serve to restrict the amount of deformation of the first seal member 81A, as shown in FIG. It is also possible to eliminate the need for the amount regulating convex portion 95 (see FIG. 9, etc.).

Note that in FIGS. 22 to 24, the distances T1, T2, and T3, which are the distances between the upper surface 11a of the housing 11 and the upper surface 41a of the rotating disk 40, satisfy T2<T1<<T3.

Similarly, the height H4 of the fixed disk convex portion 94 may be made larger than the height H3 of the rotary disk lower surface convex portion 93. Furthermore, the height H2 of the convex portion 92 on the upper surface of the rotating disk is made greater than the height H1 of the convex portion 91 of the housing, and the height H3 of the convex portion 93 on the lower surface of the rotating disk is made greater than the height H4 of the convex portion 94 on the fixed disk. You may.

(9th example)
In this embodiment, as shown in FIG. 25, the housing protrusion 91 includes a first housing protrusion 91A provided on the outer diameter side and a second housing protrusion 91B provided on the inner diameter side. Further, the rotating disk upper surface convex portion 92 includes a first rotating disk upper surface convex portion 92A provided on the outer diameter side and a second rotating disk upper surface convex portion 92B provided on the inner diameter side. When the rotary disk 40 is rotationally driven to switch the flow path, the first housing convex portion 91A and the first rotary disk upper surface convex portion 92A overlap, and the second housing convex portion 91B and the second rotary disk upper surface convex portion 92B overlap. overlap.

As shown in FIGS. 25 to 27, when the rotating disk 40 is rotationally driven to switch the flow path, when the rotation angle of the rotating disk 40 is an angle θA, the second housing convex portion 91B and the upper surface of the second rotating disk The first housing convex portion 91A and the first rotary disk upper surface convex portion 92A begin to overlap when the rotation angle of the rotating disk 40 is angle θB (>angle θA).

As a result, when switching the flow path, stress concentration on the contact surface between the housing convex portion 91 and the rotating disk upper surface convex portion 92 is alleviated, and rotation when the housing convex portion 91 and the rotating disk upper surface convex portion 92 begin to overlap. It is possible to simultaneously suppress an increase in the drive torque of the disk 40. Note that this embodiment can be similarly applied to the rotating disk lower surface convex portion 93 and the fixed disk convex portion 94.

Note that the first housing convex portion 91A (first rotating disk upper surface convex portion 92A) and the second housing convex portion 91B (second rotating disk upper surface convex portion 92B) may be in contact with each other in the radial direction, but may not be separated from each other. It's okay.

Alternatively, the first housing convex portion 91A and the first rotary disk upper surface convex portion 92A may begin to overlap, and then the second housing convex portion 91B and the second rotary disk upper surface convex portion 92B may begin to overlap.

Furthermore, the speed at which the rotary disk 40 is driven to rotate may be slowed down at the start and end of the overlapping of the housing convex portion 91 and the rotary disk upper surface convex portion 92.

(10th example)
The first seal member 81A and the second seal member 81B are made of, for example, fluororesin or rubber. Therefore, if the first seal member 81A and the second seal member 81B are left in the same sealed (grounded) state for a long time without rotating the rotating disk 40 for a long time (that is, for a predetermined time or longer), the There is a possibility that the first seal member 81A and the second seal member 81B may stick to the upper surface 11a of the housing 11 or the upper surface 51a of the fixed disk 50. Thereafter, when the rotating disk 40 rotates and the first seal member 81A and the second seal member 81B are forcibly peeled off from each other, the first seal member 81A and the second seal member 81B There is a risk that the sealing function may deteriorate due to cracking or damage.

Therefore, in this example, in a vehicle in which the flow path switching device 1 of this embodiment is installed, the IG (i.e., the ignition switch) is turned off and the flow of fluid supplied to the flow path switching device 1 is controlled. When stopping, if it is predicted that the rotating disk 40 will not be rotated for a predetermined period of time or more, when the rotation of the rotating disk 40 is stopped after switching the flow path, the housing convex portion 91 and the convex top surface of the rotating disk 92 (rotating disk lower surface convex portion 93 and stationary disk convex portion 94) are kept in an overlapping state. As a result, when the IG is left in the OFF state and the flow of fluid supplied to the flow path switching device 1 is stopped, the first seal member 81A (second seal member 81B) is attached to the upper surface 11a of the housing 11. (The upper surface 51a of the fixed disk 50) is kept in a non-contact state (or in a state where the surface pressure is lowered).

Specifically, the control unit 14 performs control according to the contents of the flowcharts shown in FIGS. 28 and 29. First, the control unit 14 determines whether IG is ON (step S1).

Then, when the IG is ON (step S1: YES), the control unit 14 turns on the valve control ECU 14a provided in the control unit 14 (step S2), and takes in the switching valve position tdeg (step S3). , it is determined whether the initial position flag (X initial position) is 0 (step S4). Note that the switching valve position tdeg is the position of the rotating disk 40 in the direction in which it is rotationally driven.

If the initial position flag is 0 (step S4: YES), the control unit 14 stops the water pump (not shown) (step S5), and executes clockwise switching drive (step S6). , it is determined whether the switching valve position tdeg is 0deg or less (step S7). Note that the water pump is a device that supplies water to the flow path switching device 1 when water is caused to flow as a fluid in the flow path switching device 1.

When the switching valve position tdeg is 0deg or less (step S7: YES), the control unit 14 stops the switching drive (step S8). As a result, the flow path enters the state of the A pattern (for example, the state of the first flow path pattern shown in FIG. 6), and the rotational drive of the rotary disk 40 is stopped.

Next, the control unit 14 sets the A pattern stop flag (XA pattern stop) and the initial position flag to 1 (steps S9 and S10).

Moreover, when the switching valve position tdeg is larger than 0deg in step S7 (step S7: NO), the control unit 14 continues to perform the switching drive clockwise (step S11).

Further, if the initial position flag is 1 in step S4 (step S4: NO), the control unit 14 stops the water pump (step S12), and performs normal switching control (normal flow path switching control). (Step S13), the stop position (that is, the stop position of the rotating disk 40) is acquired (Step S14), and the A pattern is stopped (the flow path is in the A pattern state and the rotational drive of the rotating disk 40 is stopped). It is determined whether or not (step S15).

If the pattern A is stopped (step S15: YES), the control unit 14 sets the pattern A stop flag to 1 (step S16). On the other hand, when the A pattern is not stopped (that is, the B pattern is stopped (the flow path is in the B pattern state (for example, the second flow path pattern state shown in FIG. 7)), the rotational drive of the rotating disk 40 is stopped. (stop)) (step S15: NO), the control unit 14 sets the A pattern stop flag to 0 (step S17).

Then, in step S1, if the IG is OFF (step S1: NO), the control unit 14 stops the water pump (step S18), and determines whether the A pattern stop flag is 1 or not. (Step S19).

Then, when the A pattern stop flag is 1 (step S19: YES), the control unit 14 executes the switching drive (rotation drive of the rotating disk 40) counterclockwise (step S20) to position the switching valve. It is determined whether tdeg is 30deg or more (step S21). Here, when the switching valve position tdeg is 30 degrees, the housing convex portion 91 and the rotating disk upper surface convex portion 92 (the rotating disk lower surface convex portion 93 and the fixed disk convex portion 94) overlap, and the first seal member 81A (second seal member 81B) is in a non-contact state (or in a state where the surface pressure is reduced) with the upper surface 11a of the housing 11 (the upper surface 51a of the fixed disk 50).

When the switching valve position tdeg is 30 degrees or more (step S21: YES), the control unit 14 stops the switching drive (step S22) and turns off the valve control ECU 14a (step S23). As a result, the first seal member 81A (second seal member 81B) comes into a non-contact state (or a state where the surface pressure is reduced) with the upper surface 11a of the housing 11 (the upper surface 51a of the fixed disk 50). On the other hand, when the switching valve position tdeg is less than 30 degrees (step S21: NO), the control unit 14 continues to perform the switching drive counterclockwise (step S24).

Further, when the A pattern stop flag is 0 in step 19 (step S19: NO), the control unit 14 executes the switching drive clockwise (step S25), and the switching valve position tdeg is 30 degrees or less. It is determined whether or not (step S26).

When the switching valve position tdeg is 30 degrees or less (step S26: YES), the control unit 14 stops the switching drive (step S22) and turns off the valve control ECU 14a (step S23). As a result, the first seal member 81A (second seal member 81B) comes into a non-contact state (or a state where the surface pressure is reduced) with the upper surface 11a of the housing 11 (the upper surface 51a of the fixed disk 50). On the other hand, when the switching valve position tdeg is larger than 30deg (step S26: NO), the control unit 14 continues to perform the switching drive clockwise (step S11).

As described above, in this embodiment, the control unit 14 controls when the IG is in the OFF state and the water pump is stopped to stop the flow of water supplied to the flow path switching device 1 (i.e., when the flow of water is stopped for a long time). (when the flow stops), the housing convex portion 91 and the rotary disk upper surface convex portion 92 overlap (the rotating disk lower surface convex portion 93 and the fixed disk convex portion 94), and the first seal member 81A (the first seal member 81A) 2 seal member 81B) is brought out of contact with the upper surface 11a of the housing 11 (upper surface 51a of the fixed disk 50) (or the surface pressure is reduced), and then the rotational drive of the rotary disk 40 is stopped.

That is, when the IG is OFF (that is, when the water pump is stopped and the flow of water supplied to the flow path switching device 1 is stopped), the control unit 14 controls the housing convex portion 91 and the rotary disk upper surface convex portion. 92 to enlarge the first gap δ1.

Thereby, sticking and settling of the first seal member 81A to the upper surface 11a of the housing 11 can be suppressed, and the sealing performance of the first seal member 81A can be maintained.

Similarly, when the IG is OFF (that is, when the water pump is stopped and the flow of water supplied to the flow path switching device 1 is stopped), the control unit 14 controls the rotating disk lower surface convex portion 93. The second gap δ2 is enlarged by overlapping the fixed disk convex portion 94.

Thereby, sticking and sagging of the second seal member 81B to the upper surface 51a of the fixed disk 50 can be suppressed, and the sealing performance of the second seal member 81B can be maintained.

Note that even if the IG is not OFF, the control unit 14 stops the water pump to stop the flow of water supplied to the flow path switching device 1 (that is, when the flow of water is stopped for a long time). In addition, the housing convex portion 91 and the rotary disk upper surface convex portion 92 are overlapped to enlarge the first gap δ1, or the rotary disk lower surface convex portion 93 and the fixed disk convex portion 94 are overlapped to enlarge the second gap δ2. may be expanded.

<Second embodiment>
Next, a second embodiment will be described.

(Explanation of the overall outline of the flow path switching device)
First, the overall outline of the flow path switching device 2 of this embodiment will be explained.

As shown in FIGS. 30 and 31, the flow path switching device 2 includes a housing 211, a slide valve 212, and a drive section 213.

The housing 211 includes a flow passage port 220 through which fluid flows in or out. Here, the flow path switching device 2 is a hexagonal valve as an example, and the housing 211 includes six flow path ports 220. Note that the housing 211 is made of resin, for example. Further, the flow path port 220 is an example of a "housing communication path" in the present disclosure.

Slide valve 212 is provided inside housing 211. Note that the slide valve 212 is an example of a "valve body part", a "valve body", or a "slide disk" of the present disclosure. Furthermore, the slide valve 212 is made of resin, for example.

The slide valve 212 is formed in a rectangular plate shape (that is, a substantially rectangular parallelepiped shape), and includes at least one slide valve communication passage 260. Here, the slide valve 212 includes, for example, four slide valve communication passages 260. Note that the slide valve communication path 260 is an example of a "valve body communication path" or a "slide disk communication path" in the present disclosure.

The drive unit 213 includes an actuator (not shown) for providing power to drive the slide valve 212.

Furthermore, as shown in FIG. 31, a seal member 281 is provided between the housing 211 and the slide valve 212 to seal the flow path. Further, the slide valve 212 is biased by a spring 282.

Note that the seal member 281 is made of, for example, fluororesin (eg, Teflon (registered trademark)). Further, the sealing member 281 may be formed of rubber coated with fluororesin. Furthermore, the seal member 281 may be formed of a material other than fluororesin or rubber. Further, the seal member 281 is an example of the "first seal member" of the present disclosure.

The flow path switching device 2 having such a configuration forms a flow path by combining the flow path port 220 of the housing 211 and the slide valve communication path 260. As shown in FIGS. 30 and 32, the flow path switching device 2 drives the slide valve 212 to slide in the axial direction of the drive shaft 213a by the drive shaft 213a of the drive unit 213, and connects the flow path opening 220. The flow path is switched by changing the combination of communicating with the slide valve communication path 260. Note that the axial direction of the drive shaft 213a is an example of a "predetermined direction" in the present disclosure.

In this way, in the flow path switching device 2, the slide valve 212 constitutes a valve body portion. Therefore, the thickness of the flow path switching device 2 can be reduced.

As shown in FIG. 33, a housing convex portion 291 is provided on a surface 211a of the housing 211 facing the slide valve 212. A plurality of housing protrusions 291 (in this case, five) are provided and are evenly arranged in the direction in which the slide valve 212 is driven.

Furthermore, a slide valve convex portion 292 is provided on a surface 212a of the slide valve 212 facing the housing 211. A plurality of slide valve protrusions 292 (three in this case) are provided, and they are arranged evenly in the direction in which the slide valve 212 is driven.

As shown in FIG. 34, when the drive shaft 213a of the drive unit 213 drives the slide valve 212 to slide in the axial direction of the drive shaft 213a to switch the flow path, the housing convex portion 291 and the slide valve convex portion 292 overlap. As a result, the gap δ3 between the housing 211 and the slide valve 212 is expanded. Note that δ3 is an example of the "first gap" of the present disclosure.

In this way, by enlarging the gap δ3 when switching the flow path, the seal member 281 can be brought out of contact with the surface 211a of the housing 211, or the surface pressure of the seal member 281 can be reduced. Therefore, when the seal member 281 slides on the surface 211a of the housing 211 and the channel port 220 (specifically, the edge of the channel port 220), it is possible to suppress sliding wear of the seal member 281. Further, it is possible to prevent the seal member 281 from coming off a predetermined position due to sliding resistance received from the surface 211a of the housing 211 and the flow path opening 220.

Further, although the slide valve communication passage 260 was formed in a groove shape in the example shown in FIG. 31, it may be formed in a hollow shape (tunnel shape) as shown in FIG. Thereby, as shown in FIG. 36, after the slide valve 212 is assembled into the housing 211, the seal member 281 can be attached from the outside. Therefore, when the housing 211 is formed by vibration welding, which is low cost, the seal member 281 does not have to come into vibration contact at the same time, so unnecessary wear of the seal member 281 can be prevented.

Further, at least one of the housing convex portion 291 and the slide valve convex portion 292 may have a slit 96 (see FIG. 15, etc.) formed in the convex tip surface thereof.

In this way, by forming the slit 96, when switching the flow path when the liquid flows through the flow path, the liquid is interposed between the overlapping housing convex portion 291 and the slide valve convex portion 292, and the housing The sliding resistance generated between the convex portion 291 and the slide valve convex portion 292 can be reduced.

Furthermore, by forming the slit 96, the contact area between the housing convex portion 291 and the slide valve convex portion 292 becomes smaller, so that the sliding resistance generated between the housing convex portion 291 and the slide valve convex portion 292 is reduced. Can be reduced.

Further, by forming the slit 96, even if a foreign object should become caught between the housing convex portion 291 and the slide valve convex portion 292, it can be removed through the slit 96.

The slit 96 may be formed to intersect the direction in which the slide valve 212 is driven.

As a result, liquid can be supplied from the slit 96 between the overlapping housing convex portion 291 and the slide valve convex portion 292 even at a rear position in the driving direction of the slide valve 212. Therefore, the liquid can be interposed between the housing protrusion 291 and the slide valve protrusion 292 more reliably, and the sliding resistance generated between the housing protrusion 291 and the slide valve protrusion 292 can be reduced.

Furthermore, since the slit 96 is formed to intersect with the driving direction of the slide valve 212, even if a foreign object moves in the driving direction of the slide valve 212, it will cross the slit 96. can be removed.

Further, as shown in FIG. 37, the flow path switching device 2 may include a vibration absorption mechanism 298 that suppresses vibration of the drive shaft 213a in a direction perpendicular to the axial direction. This vibration absorbing mechanism 298 is a mechanism in which the drive shaft 213a is fitted into the recess 212b of the slide valve 212 with some play.

Thereby, as shown in FIG. 38, even when the housing convex portion 291 and the slide valve convex portion 292 overlap, the vibration absorbing mechanism 298 can suppress the drive shaft 213a from tilting in the axial direction. Therefore, wear of the bearing 215 that supports the drive shaft 213a can be suppressed, and the sealing performance of the seal member 216 provided between the bearing 215 and the slide valve 212 can be maintained.

Also, in the flow path switching device 2 of this embodiment, similarly to the tenth example of the first embodiment, when the ignition switch of the vehicle in which the flow path switching device 2 is installed is OFF (that is, the water When the pump is stopped to stop the flow of water supplied to the flow path switching device 2), the housing protrusion 291 and the slide valve protrusion 292 may be overlapped to enlarge the gap δ3.

<Third embodiment>
In this embodiment, as shown in FIGS. 40 and 41, the disk portion 41 and the rotating shaft portion 42 are separated. The disc part 41 is engaged with the rotating shaft part 42 in a state in which it can move in the direction in which the housing convex part 91 and the rotary disk upper surface convex part 92 overlap (that is, in the vertical direction in FIG. 40) when switching the flow path. are doing. Note that the rotating disk upper surface convex portion 92 is provided on the disk portion 41. Further, the disc portion 41 is an example of the “valve body body portion forming the valve body” of the present disclosure. Further, the rotating shaft portion 42 is an example of a “drive shaft portion” of the present disclosure.

In this embodiment, the disk portion 41 and the rotating shaft portion 42 are divided in this way. Therefore, when expanding the first gap δ1, only the disk portion 41 can be moved without moving the rotating shaft portion 42. Therefore, by reliably rotating the rotating shaft portion 42 by the driving portion 13 and moving the disc portion 41, the first gap δ1 can be reliably expanded.

That is, the first gap δ1 is expanded by a larger amount than the amount of vertical play of the rotating shaft portion 42 incorporated in the driving portion 13 (for example, the amount of play in the threaded portion where the driving portion 13 and the rotating shaft portion 42 are screwed together). Even in this case, there is no risk that the rotation of the rotating shaft section 42 by the drive section 13 will be locked. Therefore, the first gap δ1 can be reliably expanded.

Further, as shown in FIG. 41, a rotating shaft portion 42 having a substantially rectangular cross section is fitted inside the substantially rectangular hole 41c of the disk portion 41, and the rotation of the rotating shaft portion 42 reliably secures the disk portion. 41 can be rotated.

Further, as shown in FIG. 40, the disc portion 41 is configured to be slidable in the axial direction of the rotating shaft portion 42 (that is, in the vertical direction in FIG. 40). Therefore, when the housing convex portion 91 and the rotary disk upper surface convex portion 92 overlap to enlarge the first gap δ1, the fixed disk 50 is pushed downward in FIG. 40, and the disc portion 41 is pushed downward in FIG. You can move it without stress. Furthermore, even if the protrusion amount of the first seal member 81A and the second seal member 81B changes due to wear or the like, the disc portion 41 moves in the vertical direction in FIG. The close contact state and the close contact state between the second seal member 81B and the fixed disk 50 can be maintained.

Further, the position where the disc part 41 and the rotating shaft part 42 are engaged separately is located below the lip seal 84 in contact with the rotating shaft part 42 in FIG. Therefore, even when the disc portion 41 moves in the vertical direction in FIG. 40, the rotating shaft portion 42 and the lip seal 84 do not slide in the vertical direction in FIG.

Moreover, the division position of the disc part 41 and the rotating shaft part 42 is a position above the upper surface 41a of the disc part 41. Therefore, the rotating disk communication path 60 can also be formed in the central portion 41d of the disk portion 41. Therefore, the degree of freedom in forming the flow path is improved. Note that the central portion 41d is a radially central portion of the disk portion 41, that is, a portion of the central axis of the disk portion 41 and a portion around the central axis.

<Fourth embodiment>
In this embodiment, as shown in FIG. 42, the rotating disk upper surface convex part 92 is engaged with the disc part 41 in a state where it can move in the direction overlapping with the housing convex part 91 (that is, in the vertical direction in FIG. 42). are doing. Further, the rotary disk lower surface convex portion 93 is engaged with the disk portion 41 in a movable state in a direction overlapping with the fixed disk convex portion 94 (that is, in the vertical direction in FIG. 42).

In this way, the convex portion 92 on the upper surface of the rotating disk and the convex portion 93 on the lower surface of the rotating disk are separated from the disk portion 41 (for example, the convex portion 92 on the upper surface of the rotating disk and the convex portion on the lower surface of the rotating disk are formed in the hole of the disk portion 41. 42) and is movable in the vertical direction in FIG. 42 with respect to the disc part 41.

Thereby, it is possible to prevent the first gap δ1 from becoming too large when the housing convex portion 91 and the rotary disk upper surface convex portion 92 overlap when switching the flow path. Therefore, since the first gap δ1 is not larger than the amount of vertical play of the rotating shaft portion 42 incorporated in the driving portion 13, the rotation of the rotating shaft portion 42 by the driving portion 13 is prevented from locking (that is, stopping). It can be avoided. In addition, the first gap δ1 between the housing 11 and the rotary disk 40 can be reliably expanded.

Note that the rotating disk upper surface convex portion 92 and the rotating disk lower surface convex portion 93 are movable in the vertical direction in FIG. In addition, when the rotating disk lower surface convex portion 93 and the fixed disk convex portion 94 overlap, the fixed disk 50 moves downward in FIG. 42 against the elastic force of the disk holding spring 82, and the first gap δ1 and the first gap The gap δ2 between the two is enlarged.

Further, the amount of protrusion of the rotary disk upper surface convex portion 92 and the rotary disk lower surface convex portion 93 is adjusted according to the protrusion amount of the first seal member 81A, the second seal member 81B, the housing convex portion 91, and the fixed disk convex portion 94. However, the rotating disk upper surface convex portion 92 and the rotating disk lower surface convex portion 93 can be assembled to the rotating disk 40 in an optimal state. Therefore, when expanding the first gap δ1 and the second gap δ2, the surface pressure acting on the first seal member 81A and the second seal member 81B can be optimized.

Note that this embodiment may be combined with the third embodiment described above.

<Fifth embodiment>
In this embodiment, as shown in FIG. 43, the center portion 41d of the disc portion 41 is located on the driving portion 13 side of the housing 11 (i.e., the rotation axis 42 side (upper side in FIG. 43) and the disk portion 51 of the fixed disk 50. In the central portion 41d, the outer diameter φD2 of the portion 41db on the fixed disk 50 side is made larger than the outer diameter φD1 of the portion 41da on the drive unit 13 side.

In this way, since the central portion 41d is supported on both ends in the axial direction, even if there is a gap between the central portion 41d and the housing 11 or between the central portion 41d and the fixed disk 50, the central portion 41d By suppressing the tilting, it is possible to suppress the rotating shaft portion 42 from tilting. Therefore, the disk part 41 can be rotated stably by the rotating shaft part 42 to switch the flow path.

Further, in the central portion 41d, the outer diameter φD2 of the portion 41db on the fixed disk 50 side located far from the drive portion 13 is made larger than the outer diameter φD1 of the portion 41da on the drive portion 13 side located close to the drive portion 13. are doing. In this way, since the outer diameter of the portion of the central portion 41d that is far from the driving portion 13 is increased, the central portion 41d is more effectively prevented from tilting, and the rotating shaft portion 42 is inhibited from tilting. can. Furthermore, when the rotating disk 40 vibrates, the pressure receiving area of the center portion 41d (that is, the contact area between the center portion 41d of the rotating disk 40 and the disk portion 51 of the fixed disk 50) increases, so that the center portion 41d Abrasion can be suppressed.

<Sixth embodiment>
In this embodiment, as shown in FIG. 44, a portion 41da of the central portion 41d of the disk portion 41 of the rotating disk 40 on the driving portion 13 side is supported by a lip seal 85. Note that an O-ring may be used instead of the lip seal 85.

In this way, the lip seal 85 can support the rotating disk 40 while sealing between the housing 11 and the central portion 41d. Further, even if vibration occurs in the housing 11 and the fixed disk 50, the lip seal 85 can absorb the displacement of both, thereby suppressing wear of the central portion 41d. Further, since the central portion 41d can be held by the lip seal 85 at a location closer to the rotating disk 40 than the lip seal 84 on the drive unit 13 side, vibrations of the rotating disk 40 can be suppressed more effectively. Further, since the lip seal 85 can prevent fluid (for example, water) from entering the drive unit 13 side, it is also possible to eliminate the lip seal 84 on the drive unit 13 side.

Note that the portion 41db of the central portion 41d on the fixed disk 50 side may be supported by a lip seal (not shown).

<Seventh embodiment>
In this embodiment, as shown in FIG. 45, the valve body portion 12 includes a plate-shaped fixed disk 100, a plate-shaped rotating disk 40, and a plate-shaped fixed disk 50 in the thickness direction of each disk. They are formed in a layered manner. Note that the fixed disk 100 is an example of the "first fixed disk" of the present disclosure, and the fixed disk 50 is an example of the "second fixed disk" of the present disclosure.

A first seal member 81A is provided between the fixed disk 100 and the rotating disk 40. Further, a second seal member 81B is provided between the rotating disk 40 and the fixed disk 50.

Further, as shown in FIG. 46, a fixed disk convex portion 99 is provided on the lower surface 101a of the disk portion 101 of the fixed disk 100, which faces the rotating disk 40. Furthermore, a rotating disk upper surface convex portion 92 is provided on the upper surface 41a of the rotating disk 40 facing the fixed disk 100. Furthermore, a rotating disk lower surface convex portion 93 is provided on the lower surface 41b of the rotating disk 40 facing the fixed disk 50. Furthermore, a fixed disk convex portion 94 is provided on the upper surface 51a of the fixed disk 50 facing the rotating disk 40.

Note that the fixed disk convex portion 99 is an example of the “first fixed disk convex portion” of the present disclosure, and the rotating disk upper surface convex portion 92 is an example of the “first drive disk convex portion” of the present disclosure. Further, the rotating disk lower surface convex portion 93 is an example of the “second driving disk convex portion” of the present disclosure, and the fixed disk convex portion 94 is an example of the “second fixed disk convex portion” of the present disclosure.

Further, as shown in FIG. 45, a disk holding spring 182 as an elastic member is provided between the housing 11 and the fixed disk 100. Further, a disk holding spring 82 as an elastic member is provided between the fixed disk 50 and the housing 11.

Then, when switching the flow path, the fixed disk convex portion 99 and the rotating disk upper surface convex portion 92 overlap to enlarge the first gap δ1 (see FIG. 46) between the fixed disk 100 and the rotating disk 40. Further, when switching the flow path, the rotary disk lower surface convex portion 93 and the fixed disk convex portion 94 overlap to enlarge the second gap δ2 (see FIG. 46) between the rotary disk 40 and the fixed disk 50.

In this way, the fixed disk 100 and the fixed disk 50, which are movable by the disk holding spring 182 and the disk holding spring 82, are provided on both sides of the rotating disk 40. The fixed disk 100 is supported in a freely movable manner by a disk holding spring 182, and the fixed disk 50 is supported in a freely movable condition by a disk retaining spring 82.

Thereby, in the event that the rotating disk 40 is tilted, the fixed disk 100 and the fixed disk 50 can be tilted so as to follow the tilt of the rotating disk 40. Therefore, the state in which the first seal member 81A is in contact with the lower surface 101a of the disk portion 101 of the fixed disk 100 and the state in which the second seal member 81B is in contact with the upper surface 51a of the disk portion 51 in the fixed disk 50 can be maintained. Therefore, the sealing performance between the first seal member 81A and the second seal member 81B can be ensured. Furthermore, the first gap δ1 between the fixed disk 100 and the rotating disk 40 and the second gap δ2 between the rotating disk 40 and the fixed disk 50 can be reliably expanded.

Further, since it is difficult to eliminate leakage of fluid from the flow path into the housing 11, the high pressure (for example, 300 kPa) of the fluid inside the housing 11 acts on the inner surface of the housing 11, and as shown in FIG. As shown by the broken line, there is a risk that the inner surface of the housing 11 (particularly the central portion of the upper surface 11a of the housing 11) may swell in the vertical direction in FIG. 47. In this case, there is a possibility that the sealing performance of the first seal member 81A may be deteriorated. Note that the second seal member 81B on the lower surface 41b of the rotating disk 40 is easily maintained in contact with the stationary disk 50 due to the elastic force of the disk holding spring 82, so that deterioration in sealing performance is unlikely to occur.

In contrast, in this embodiment, a fixed disk 100 and a fixed disk 50 are provided on both sides of the rotating disk 40, as shown in FIG. As a result, even if the inner surface of the housing 11 swells, the elastic force of the disk holding spring 182 pushes the fixed disk 100 toward the rotating disk 40, and the elastic force of the disk holding spring 82 pushes the fixed disk 50 toward the rotating disk 40. being pushed towards me. Therefore, the sealing performance between the first seal member 81A and the second seal member 81B can be maintained.

Note that as a countermeasure against the swelling of the inner surface of the housing 11, the first seal member 81A may be devised as shown in FIGS. 48 and 49. That is, in the first seal member 81A, the amount of protrusion of the tip that contacts the inner surface (ie, the upper surface 11a) of the housing 11 may be made larger on the inner circumferential side of the rotary disk 40 than on the outer circumferential side.

Specifically, as shown in FIG. 48, this is handled by adjusting the depth of the seal groove in which the first seal member 81A is attached. That is, for the first sealing member 81A, the protrusion amount Δ is formed by satisfying (seal groove depth t5)>(seal groove depth t6) and (protrusion amount t1)<(protrusion amount t2). Note that for the second seal member 81B, (depth of the seal groove t7)=(depth of the seal groove t8), and (protrusion amount t3)=(protrusion amount t4).

Alternatively, as shown in FIG. 49, the height of the first seal member 81A (that is, the seal height) may be adjusted accordingly. That is, for the first seal member 81A, the protrusion amount Δ is formed by satisfying (seal height t9)<(seal height t10) and (protrusion amount t1)<(protrusion amount t2). Note that for the second seal member 81B, (seal height t11) = (seal height t12), and (protrusion amount t3) = (protrusion amount t4).

In this way, in response to the expansion of the housing 11, by increasing the amount of protrusion of the tip of the first seal member 81A on the radially inner side of the upper surface 41a of the rotating disk 40, the first seal member 81A is Sealing performance can be ensured.

<Eighth embodiment>
In this embodiment, as shown in FIGS. 50 and 51, the housing convex portion 91 and the rotary disk upper surface convex portion 92 include gentle slope portions 91b, 92b and steep slope portions 91c, 92c, respectively. When the housing convex portion 91 and the rotary disk upper surface convex portion 92 overlap, the gentle slope portions 91b and 92b contact each other, and then the steep slope portions 91c and 92c contact each other.

Specifically, when the housing convex portion 91 and the rotary disk upper surface convex portion 92 overlap when switching the flow paths, the gentle slope portions 91b and 92b first come into contact with each other, as shown in FIG. 50. That is, the gentle slope part 91b at the base of the housing convex part 91 and the gentle slope part 92b at the tip of the rotary disk upper surface convex part 92 come into contact. In this way, when the housing convex portion 91 and the rotary disk upper surface convex portion 92 begin to overlap, the housing convex portion 91 and the rotary disk upper surface convex portion 92 come into surface contact rather than line contact (or point contact). Thereby, it is possible to avoid stress acting on the housing convex portion 91 from the tip of the rotating disk upper surface convex portion 92 from being concentrated.

Next, as shown in FIG. 51, the steep slope portions 91c and 92c come into contact with each other. That is, the steep slope part 91c on the side surface of the housing convex part 91 and the steep slope part 92c on the side surface of the rotary disk upper surface convex part 92 come into contact. In this way, the housing convex portion 91 and the rotary disk upper surface convex portion 92 come into surface contact.

Next, as shown in FIG. 52, the spherical surface portion 91d at the tip of the housing convex portion 91 and the gentle slope portion 92b at the tip of the rotary disk upper surface convex portion 92 come into contact. At this time, the housing convex portion 91 and the rotating disk upper surface convex portion 92 are in line contact, but since the first gap δ1 has expanded, the tip of the rotating disk upper surface convex portion 92 is connected to the housing convex portion 91. The stress that acts is small.

Next, as shown in FIG. 53, the flat portion 91e at the tip of the housing convex portion 91 and the flat portion 92e at the tip of the rotating disk upper surface convex portion 92 come into contact. Next, as shown in FIG. 54, the spherical portion 91d at the tip of the housing convex portion 91 and the gentle slope portion 92b at the tip of the rotary disk upper surface convex portion 92 come into contact.

Next, as shown in FIG. 55, the steep slope portions 91c and 92c come into contact with each other, and as shown in FIG. 56, the gentle slope portions 91b and 92b come into contact with each other.

In this manner, when the housing convex portion 91 and the rotating disk upper surface convex portion 92 begin to overlap when switching the flow path, as shown in FIG. The gentle slope portion 92b of the portion 92 abuts, and the housing convex portion 91 and the rotating disk upper surface convex portion 92 come into surface contact. Further, the same applies when the housing convex portion 91 and the rotary disk upper surface convex portion 92 finish overlapping each other, as shown in FIG. 56. Therefore, when the housing convex portion 91 and the rotating disk upper surface convex portion 92 begin to overlap or end to overlap, stress acting from the tip of the rotating disk upper surface convex portion 92 on the housing convex portion 91 is prevented from being concentrated. can. Therefore, since the rotating disk 40 can be easily rotated, the driving section 13 that rotates the rotating disk 40 can be downsized (for example, the motor provided in the driving section 13 can be downsized). Moreover, the flow path can be switched stably.

As shown in FIG. 57, the housing convex portion 91 is provided with a gentle slope portion 91f instead of the spherical surface portion 91d, and the gentle slope portion 91f at the tip of the housing convex portion 91 and the convex portion 92 on the upper surface of the rotating disk are connected to each other. The gentle slope portion 92b at the tip may be in surface contact.

Note that the embodiments described above are merely illustrative, and do not limit the present disclosure in any way, and it goes without saying that various improvements and modifications can be made without departing from the spirit of the disclosure.

For example, as shown in FIGS. 6 and 7, the first seal member 81A crosses the flow path opening of the inflow flow path 20, while the second seal member 81B crosses the flow path opening of the fixed disk communication path 70 connected to the outflow flow path 30. Do not cross. However, the present invention is not limited to this, and even if the first seal member 81A does not cross the flow path opening of the inflow flow path 20, while the second seal member 81B crosses the flow path opening of the fixed disk communication path 70 connected to the outflow flow path 30. good.

Further, in the flow path switching device 2, the slide valve 212 (an example of a "valve body part" of the present disclosure) has a housing convex portion 291 and a slide valve convex portion 292 (an example of a "valve body convex portion" of the present disclosure). may be engaged with the drive shaft 213a (an example of the "drive shaft section" of the present disclosure) in a state in which the drive shaft 213a is movable in the direction in which they overlap.

1, 2 Channel switching device 11 Housing 11a Upper surface 12 Valve body portion 13 Drive unit 20 Inflow channel 21 First inflow channel 22 Second inflow channel 23 Third inflow channel 30 Outflow channel 31 First outflow channel 32 Second outflow channel 33 Third outflow channel 40 Rotating disk 41 Disk section 41a Upper surface 41b Lower surface 41c Hole 41d Central section 41da (Drive section side) section 41db (Fixed disk side) section 42 Rotating shaft section 50 Fixed Disk 51 Disk portion 51a Upper surface 60 Rotating disk communication path 61 First rotating disk communication path 62 Second rotating disk communication path 63 Third rotating disk communication path 70 Fixed disk communication path 71 First fixed disk communication path 72 Second fixed disk Communication path 73 Third fixed disk communication path 81A First seal member 81B Second seal member 91 Housing convex portion 91b Gentle slope portion 91c Steep slope portion 92 Rotating disk upper surface convex portion 92b Gentle slope portion 92c Steep slope portion 93 Rotating disk lower surface convex portion 94 Fixed disk convex portion 95 Seal deformation amount regulating convex portion 96 Slit 99 Fixed disk convex portion 100 Fixed disk 101 Disk portion 101a Lower surface 182 Disc retaining spring 211 Housing 211a Surface 212 Slide valve 212a Surface 213 Drive portion 213a Drive shaft 220 Channel port 260 Slide valve communication passage 281 Seal member 291 Housing convex portion 292 Slide valve convex portion 298 Runout absorption mechanism δ1 First gap δ2 Second gap δ3 Gap

Claims (21)

housing and
a valve body portion provided inside the housing;
The valve body portion includes a valve body formed in a plate shape,
The housing includes a plurality of housing communication passages,
The valve body includes at least one valve body communication passage,
A flow path is formed by combining the housing communication path and the valve body communication path,
A first sealing member for sealing the flow path is provided between the housing and the valve body,
A housing convex portion is provided on a surface of the housing facing the valve body,
A valve body convex portion is provided on a surface of the valve body facing the housing,
When driving the valve body to switch the flow path, the housing convex portion and the valve body convex portion overlap to enlarge a first gap between the housing and the valve body;
A flow path switching device characterized by: The flow path switching device according to claim 1,
At least one of the housing convex portion and the valve body convex portion has a slit formed in its convex tip end surface;
A flow path switching device characterized by: In the flow path switching device according to claim 2,
the slit is formed to intersect the direction in which the valve body is driven;
A flow path switching device characterized by: In the flow path switching device according to any one of claims 1 to 3,
The valve body is a plate-shaped driving disk,
The drive disk is formed in a disk shape and is rotationally driven;
A flow path switching device characterized by: In the flow path switching device according to claim 4,
When the drive disk is rotationally driven to switch the flow path, the housing convex portion and the valve body convex portion begin to overlap from a position on the inner diameter side of the drive disk;
A flow path switching device characterized by: In the flow path switching device according to any one of claims 1 to 3,
Enlarging the first gap by overlapping the housing convex portion and the valve body convex portion when the flow of fluid supplied to the flow path switching device is stopped;
A flow path switching device characterized by: The flow path switching device according to claim 1,
The valve body is a plate-shaped driving disk,
The valve body section includes a plate-shaped fixed disk in addition to the drive disk,
The drive disk and the fixed disk are arranged in a stacked manner in the axial direction,
The valve body communication passage is a drive disk communication passage that penetrates the drive disk in the axial direction,
The fixed disk includes a plurality of fixed disk communication passages penetrating in the axial direction,
forming the flow path by combining the housing communication path, the driving disk communication path, and the fixed disk communication path;
A flow path switching device characterized by: The flow path switching device according to claim 7,
A second seal member is provided between the drive disk and the fixed disk to seal the flow path,
A driving disk convex portion is provided on a surface of the driving disk facing the fixed disk,
A fixed disk convex portion is provided on a surface of the fixed disk facing the drive disk,
When driving the drive disk to switch the flow path, the drive disk convex portion and the fixed disk convex portion overlap to enlarge a second gap between the drive disk and the fixed disk;
A flow path switching device characterized by: The flow path switching device according to claim 8,
At least one of the drive disk convex portion and the stationary disk convex portion has a slit formed on the tip surface of the convex shape;
A flow path switching device characterized by: The flow path switching device according to claim 9,
the slit is formed to intersect with the direction in which the drive disk is driven;
A flow path switching device characterized by: The flow path switching device according to any one of claims 7 to 10,
The drive disk is formed in a disk shape and is rotationally driven;
A flow path switching device characterized by: The flow path switching device according to claim 11,
A second seal member is provided between the drive disk and the fixed disk to seal the flow path,
A driving disk convex portion is provided on a surface of the driving disk facing the fixed disk,
A fixed disk convex portion is provided on a surface of the fixed disk facing the drive disk,
When driving the driving disk to switch the flow path, the driving disk convex portion and the fixed disk convex portion overlap to enlarge a second gap between the driving disk and the fixed disk,
When the drive disk is rotationally driven to switch the flow path, the housing convex portion and the valve body convex portion, and the drive disk convex portion and the fixed disk convex portion are moved from a position on the inner diameter side of the drive disk. begin to overlap,
A flow path switching device characterized by: The flow path switching device according to any one of claims 8 to 10,
When the flow of fluid supplied to the flow path switching device stops,
enlarging the first gap by overlapping the housing convex portion and the valve body convex portion;
enlarging the second gap by overlapping the driving disk convex portion and the fixed disk convex portion;
A flow path switching device characterized by: In the flow path switching device according to any one of claims 1 to 3,
The valve body is a slide disk that is driven to slide in a predetermined direction,
The valve body communication passage is a slide disc communication passage provided in the slide disc,
forming the flow path by combining the housing communication path and the slide disk communication path;
A flow path switching device characterized by: The flow path switching device according to claim 14,
a drive shaft that drives the slide disk to slide in the axial direction;
comprising a vibration absorption mechanism that suppresses vibration of the drive shaft in a direction perpendicular to the axial direction;
A flow path switching device characterized by: The flow path switching device according to claim 14,
Enlarging the first gap by overlapping the housing convex portion and the valve body convex portion when the flow of fluid supplied to the flow path switching device is stopped;
A flow path switching device characterized by: The flow path switching device according to any one of claims 1 to 3 and 7 to 10,
a valve body portion forming the valve body;
a drive shaft portion that drives the valve body body portion;
The valve body convex portion is provided on the valve body body,
The valve body body part is engaged with the drive shaft part in a state where it can move in a direction in which the housing convex part and the valve body convex part overlap,
A flow path switching device characterized by: The flow path switching device according to any one of claims 1 to 3 and 7 to 10,
the valve body protrusion is engaged with the valve body in a movable direction in a direction overlapping with the housing protrusion;
A flow path switching device characterized by: housing and
a valve body portion provided inside the housing;
The valve body portion includes a valve body formed in a plate shape,
The housing includes a plurality of housing communication passages,
The valve body includes at least one valve body communication passage,
A flow path is formed by combining the housing communication path and the valve body communication path,
The valve body portion is formed by laminating a plate-shaped first fixed disk, a plate-shaped driving disk serving as the valve body, and a plate-shaped second fixed disk in the thickness direction,
A sealing member for sealing the flow path is provided between the first fixed disk and the driving disk and between the driving disk and the second fixed disk,
A first fixed disk convex portion is provided on a surface of the first fixed disk facing the drive disk,
A first driving disk convex portion is provided on a surface of the driving disk facing the first fixed disk,
A second driving disk convex portion is provided on a surface of the driving disk facing the second fixed disk,
A second fixed disk convex portion is provided on a surface of the second fixed disk facing the drive disk,
An elastic member is provided between the housing and the first fixed disk and between the second fixed disk and the housing,
When driving the driving disk to switch the flow path,
the first fixed disk convex portion and the first drive disk convex portion overlap to enlarge a gap between the first fixed disk and the drive disk;
and,
the second driving disk convex portion and the second fixed disk convex portion overlap to enlarge a gap between the driving disk and the second fixed disk;
A flow path switching device characterized by: The flow path switching device according to any one of claims 1 to 3 and 7 to 10,
The valve body is a plate-shaped driving disk,
The valve body section includes a plate-shaped fixed disk in addition to the drive disk,
The drive disk and the fixed disk are arranged in a stacked manner in the axial direction,
The drive disk includes a disk portion and a rotating shaft portion that rotates the disk portion,
a central portion of the disc portion is supported on both sides in the axial direction by the housing and the fixed disk;
A flow path switching device characterized by: The flow path switching device according to any one of claims 1 to 3 and 7 to 10,
The housing convex portion and the valve body convex portion each include a gentle slope portion and a steep slope portion,
When the housing convex portion and the valve body convex portion overlap, the steep slope portions contact each other after the gentle slope portions contact each other;
A flow path switching device characterized by:

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