JP2021143743A - Rotary valve - Google Patents

Abstract

To switch a plurality of channels of fluid, and to suppress mixing of the fluid while switching the channels.SOLUTION: Inflow ports 34, 36 and an outflow port are formed at places facing a storage portion of a housing 11. Upstream ends and downstream ends 53b, 54b, 55b, and 61b of moving channels 51, 55, and 61 on the valve body 41 are opened on an outer surface of a valve body portion 44. The moving channels 51, 55, and 61 move with rotations of the valve body 41, thereby changing communication states of the inflow ports 34 and 36 and the outflow port. An inflow side packing 65 is equipped with a first seal portion 71 that is provided around an inflow opening 67 opening to each inflow port 34, 36 and contacted with peripheries of the inflow ports 34 and 36, and a second seal portion 72 contacted with the valve body portion 44. The outflow side packing 75 is equipped with a third seal portion 81 provided around an outflow opening 78 facing and being opened to each outflow port and contacted with the outer periphery of the outflow port, and a fourth seal portion 82 contacted with the valve body portion 44.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotary valve that rotates a valve body to switch a fluid flow path.

As a rotary valve for switching a fluid flow path, a rotary valve including a housing and a valve body is known. The housing comprises an annular peripheral wall portion having an accommodating portion. A fluid inlet to the housing is formed at a location different from the peripheral wall of the housing. In addition, fluid outlets in the accommodating portion are formed at a plurality of locations on the peripheral wall portion. The valve body includes a columnar valve body portion arranged in the accommodating portion, and is rotatably supported by the housing by the shaft portion. A movable flow path that communicates the inflow port and the outflow port is formed in the valve body. The downstream end of the movable flow path in the fluid flow direction is opened on the outer peripheral surface of the valve body. Then, by rotating the valve body, the outflow port communicating with the inflow port via the movable flow path is switched, and the flow path of the fluid is switched.

Further, in the rotary valve, a packing is arranged between the valve main body and each outlet in order to allow the fluid to flow out only from the outlet communicating with the inlet via the movable flow path. The plate-shaped packing main body that forms the skeleton of each packing has an outflow opening that opens facing the outflow port. An annular seal portion is formed on both sides of the packing main body in the thickness direction and around the outflow opening. One of the seal portions is always in contact with the periphery of the outlet on the peripheral wall portion. The other seal portion is in contact with the outer peripheral surface of the valve body, and when the downstream end of the movable flow path faces the outlet, it contacts the outer peripheral surface around the downstream end. The packing seals between the valve body and the outlet blocked by the valve body, and suppresses the leakage of fluid from the outlet that is not communicated with the inlet via the movable flow path. ..

A technique for arranging a packing between the valve body and the outlet to perform sealing is described in, for example, Patent Document 1.

Japanese Unexamined Patent Publication No. 11-125343

The conventional rotary valve targets a single fluid and allows the fluid flowing in from one inflow port to flow out from one of a plurality of outlets, but in recent years, it targets a plurality of fluids and they are used. There is an increasing need to switch the fluid flow path. In this case, it is necessary to take measures to prevent the fluids from mixing with each other while the flow paths are switched. Incidentally, since the conventional rotary valve is premised on switching the flow path of a single fluid, such measures are not necessary.

The present invention has been made in view of such circumstances, and an object of the present invention is to enable the flow paths of a plurality of fluids to be switched and to mix the fluids in a state where the flow paths are switched. The purpose is to provide a rotary valve that can be suppressed.

A rotary valve for solving the above problems includes a housing having an accommodating portion and a valve body having a valve main body accommodating the accommodating portion and being rotatably supported by the housing by a shaft portion. A plurality of inflow ports into which a plurality of fluids flow in are formed at a portion of the housing facing the accommodating portion, and a plurality of outlets through which the fluid flows out are formed. The upstream end and the downstream end in the flow direction of the fluid are opened on the outer surface of the valve body portion, and at least a part of the valve body moves as the valve body rotates. A plurality of movable flow paths for changing the communication state between the inflow port and the plurality of outlets are formed in a state of being separated from each other, and an inflow side packing is arranged between each inflow port and the valve main body portion. Outflow-side packings are arranged between the outflow port and the valve body, and each inflow-side packing is provided in the inflow opening facing each inflow port and around the inflow opening in the housing. An annular first seal portion that contacts the periphery of the inflow port and an annular second seal portion that is provided around the inflow opening and contacts the valve body portion are provided, and each outflow side packing is provided for each flow. An outflow opening that opens facing the outlet, an annular third seal that is provided around the outflow opening and contacts the periphery of the outflow in the housing, and a valve that is provided around the outflow opening. It is provided with an annular fourth seal portion that comes into contact with the main body portion.

According to the above configuration, when the upstream end of the movable flow path faces one of the inflow ports and the downstream end faces any of the inflow ports due to the rotation of the valve body, the inflow port and the outflow port of the movable flow path face each other. It is in a state of being communicated via a movable flow path. Therefore, it is possible to switch the flow paths of a plurality of fluids by rotating the valve body and switching the movable flow path that communicates the inflow port and the outflow port.

Here, regardless of the rotation phase, the first seal portion of the inflow side packing always contacts the periphery of the inflow port in the housing, and the third seal portion of the outflow side packing contacts the periphery of the outflow port in the housing. Therefore, between the valve body and the housing, the fluid can flow back and forth between the inner region and the outer region of each first seal portion via the first seal portion, and each third seal can also be used. It is also regulated that fluid travels between the inner and outer regions of the portion via the third seal portion.

Further, in the state where the flow path is switched, the second seal portion of the inflow side packing comes into contact with the periphery of the upstream end of the movable flow path on the outer surface of the valve body portion. Further, the fourth seal portion of the outflow side packing comes into contact with the periphery of the downstream end of the movable flow path on the outer surface of the valve body portion. Therefore, between the valve body and the housing, the fluid can flow back and forth between the inner region and the outer region of the second seal portion via the second seal portion, and the inside of the fourth seal portion. It is also regulated that the fluid moves back and forth between the region and the outer region via the fourth seal portion. Therefore, in the state where the flow path is switched, the phenomenon of fluid mixing is suppressed.

In the rotary valve, the valve body portion has a columnar shape, the shaft portion projects from one end surface in the direction along the axis of the valve body portion along a coaxial line, and the upstream end of each movable flow path is , The downstream end of each movable flow path is opened on the outer peripheral surface of the valve body, and the housing is the said of the valve body. An inner bottom surface facing the other end surface and an inner peripheral surface facing the outer peripheral surface of the valve body portion are provided, each inflow port is opened at the inner bottom surface of the housing, and each outlet is the housing. It is preferable that the inner peripheral surface of the above is open.

According to the above configuration, each of the plurality of fluids flows into the accommodating portion from the inflow port on the inner bottom surface of the housing. The fluid flows into the movable flow path from the upstream end on the other end face of the valve body. When the downstream end of the movable flow path faces any of the outlets, the fluid flows from the downstream end on the outer peripheral surface of the valve body to the inner peripheral surface of the housing after flowing through the movable flow path. You will be guided to the exit.

Here, as described above, when the inflow port and the outflow port are communicated with each other by the movable flow path, the first seal portion of the inflow side packing comes into contact with the periphery of the inflow port on the inner bottom surface of the housing. 2 The seal portion comes into contact with the periphery of the upstream end on the end face of the valve body portion. Therefore, the flow of fluid between the inner bottom surface of the housing and the end surface of the valve body portion is restricted between the inner region and the outer region of the first seal portion and the second seal portion, respectively.

Further, the third seal portion of the outflow side packing contacts the periphery of the outflow port on the inner peripheral surface of the housing, and the fourth seal portion contacts the periphery of the downstream end on the outer peripheral surface of the valve body portion. Therefore, between the inner peripheral surface of the housing and the outer peripheral surface of the valve body, the flow of fluid between the inner and outer regions of the third seal and the fourth seal is restricted. ..

In the rotary valve, at least one of the plurality of movable flow paths has a branch flow path portion that branches into a plurality of portions in a region from an intermediate portion in the flow direction to the outer peripheral surface, and the branch flow path The downstream end of each section is formed at a position where the downstream end of one branch flow path portion faces the outlet and the downstream end of the remaining branch flow path portion does not face any of the outlets. It is preferable that it is.

According to the above configuration, in a movable flow path having a plurality of branch flow paths, a portion upstream of the branch flow path in the fluid flow direction is composed of a common flow path. Therefore, it is possible to reduce the space occupied by the movable flow path in the valve body as compared with the case where the movable flow path does not branch from an intermediate part in the flow direction and is composed of a plurality of flow paths separated from each other. Become.

According to the rotary valve, it is possible to switch the flow paths of a plurality of fluids, and it is possible to suppress the mixing of the fluids in the state where the flow paths are switched.

The perspective view of the rotary valve in one embodiment. Top view of the rotary valve in one embodiment. An exploded perspective view of a rotary valve according to an embodiment. A perspective view of the valve body in one embodiment as viewed from the valve body side. A perspective view of the inflow side packing in one embodiment as viewed from the first seal portion side. FIG. 2 is a sectional view taken along line 6-6 of FIG. FIG. 6 is a cross-sectional view taken along the line 7-7 of FIG. FIG. 6 is a partial cross-sectional view of a rotary valve in which the valve body is in the second rotation phase. FIG. 8 is a partial cross-sectional view taken along line 9-9. FIG. 6 is a partial cross-sectional view of a rotary valve in which the valve body is in the third rotation phase. FIG. 10 is a partial cross-sectional view taken along line 11-11.

Hereinafter, an embodiment of a rotary valve provided in the middle of a plurality of fluid flow paths and switching the flow paths will be described with reference to the drawings.
Here, the fluid includes one or both of a liquid and a gas. Further, the plurality of fluids include a plurality of types of fluids having different components, and also includes a plurality of fluids of the same type. A plurality of fluids of the same type include a plurality of the same fluids and a plurality of fluids having the same composition but different in temperature or other factors such as viscosity. In the present embodiment, two types of cooling water having the same composition but different temperatures are used as fluids.

As shown in FIG. 3, the rotary valve includes a housing 11, a valve body 41, an inflow side packing 65, and an outflow side packing 75. Next, each member will be described.
<Housing 11>
As shown in FIGS. 1 and 3, the housing 11 includes a body 12 and a cover 31. The body 12 includes a substantially cylindrical peripheral wall portion 13 extending along the axis L1. The inner peripheral surface of the peripheral wall portion 13 constitutes the inner peripheral surface of the housing 11. One end of the peripheral wall portion 13 in the direction along the axis L1, the upper end in FIG. 3, is closed by the closing portion 14, and the other end, the lower end in FIG. 6, is open.

As shown in FIGS. 2, 3 and 7, the peripheral wall portion 13 is formed with a plurality of protruding wall portions 15 for mounting three packings in the present embodiment. Each protruding wall portion 15 projects outward from the peripheral wall portion 13 in the radial direction. A bearing hole 18 is formed in the central portion of the closed portion 14.

The cover 31 is arranged on the side opposite to the closing portion 14 in the direction along the axis L1 with the peripheral wall portion 13 interposed therebetween, and on the lower side in FIG. The surface of the cover 31 on the body 12 side in the direction along the axis L1, the upper surface in FIG. 3, constitutes the inner bottom surface of the housing 11, and a recess 32 for mounting the packing is formed therein.

The body 12 and the cover 31 are connected to each other at their peripheral edges. In the present embodiment, this connection is made by engaging the pin 33 provided in the cover 31 with the engagement hole 27 provided in the body 12, but even if it is made by other connecting means. good.

As shown in FIGS. 6 and 7, the space surrounded by the body 12 and the cover 31 constitutes the accommodating portion 38. An inflow port 34 of the fluid FL1 is opened in the central portion of the cover 31 so as to face the accommodating portion 38. From the peripheral edge of the inflow port 34 in the cover 31, the connecting pipe portion 35 projects toward the side away from the accommodating portion 38 along the axis L1 and downward in FIG. A pipe 85 having a flow path 86 of the fluid FL1 is connected to the connecting pipe portion 35. Further, the inflow port 36 of the fluid FL2 opens facing the accommodating portion 38 at a portion of the cover 31 that is displaced outward in the radial direction from the inflow port 34, and at a location that is displaced to the right in FIGS. 6 and 7. Has been done. A connecting pipe portion 37 projects from the peripheral edge portion of the inflow port 36 in the cover 31. The protruding direction of the connecting pipe portion 37 is in the direction away from the accommodating portion 38 along the axis L1 in the downstream portion in the flow direction of the fluid FL2, downward in FIG. 6, and in the radial direction of the cover 31 in the upstream portion. Outer, to the right in FIGS. 6 and 7. A pipe 87 having a flow path 88 of the fluid FL2 is connected to the connecting pipe portion 37.

Any of the outlets 21 to 23 is formed on each protruding wall portion 15. These outlets 21 to 23 are opened facing the accommodating portion 38. From the peripheral edge of the outlet 21 of the protruding wall portion 15, the connecting pipe portion 24 protrudes outward in the radial direction of the body 12 and to the left in FIGS. 6 and 7. A pipe 91 having a flow path 92 is connected to the connection pipe portion 24. Similarly, the connecting pipe portion 25 protrudes outward in the radial direction from the peripheral edge portion of the outlet 22 of the protruding wall portion 15, and obliquely downward to the right in FIG. Further, the connecting pipe portion 26 protrudes outward in the radial direction from the peripheral edge portion of the outlet 23 of the protruding wall portion 15, and obliquely upward to the right in FIG. A pipe 93 having a flow path 94 is connected to the connection pipe portion 25, and a pipe 95 having a flow path 96 is connected to the connection pipe portion 26.

<Valve body 41>
The valve body 41 includes a columnar valve main body 44 and a shaft 42 protruding from the center of the upper end surface 46 in FIG. 6 while being oriented along the axis L1. The shaft portion 42 has the axis L1 of the peripheral wall portion 13 as its own axis. Then, the valve body portion 44 is accommodated in the accommodating portion 38, and the shaft portion 42 is inserted into the bearing hole 18. On the other hand, in FIG. 6, the lower end surface 45 of the valve main body 44 faces the inner bottom surface of the housing 11 (cover 31), and the outer peripheral surface 47 of the valve main body 44 is the inner circumference of the housing 11 (peripheral wall portion 13). Facing the surface. The outer surfaces of the valve body 44 are formed by the both end surfaces 45 and 46 and the outer peripheral surfaces 47. The shaft portion 42 is rotatably supported with respect to the body 12 in the bearing hole 18. An O-ring 43 is interposed between the shaft portion 42 and the closing portion 14 (see FIG. 3).

As shown in FIG. 4, the valve body 44 is formed with one movable flow path 51 through which the fluid FL1 flows and two movable flow paths 55 and 61 through which the fluid FL2 flows. The movable flow paths 51, 55, 61 are separated from each other.

The movable flow path 51 includes one common flow path portion 52 that constitutes an upstream portion in the flow direction of the fluid FL1, and two branch flow path portions 53 and 54 that form a downstream portion in the same flow direction, respectively. Both branch flow path portions 53 and 54 are branched into two in a region from the middle of the movable flow path 51 in the flow direction to the outer peripheral surface 47.

The upstream end 52a of the common flow path portion 52 in the flow direction is opened at the central portion of the end surface 45 and faces the inflow port 34. The downstream end 53b of the branch flow path portion 53 and the downstream end 54b of the branch flow path portion 54 are formed at locations on the outer peripheral surface 47 that satisfy the following conditions. The condition is that the downstream end 53b faces one of the outlets 21 and 22, and the downstream end 54b is located at a position that does not face any of the outlets 21-23. Further, the downstream end 54b is located at a position facing the outlet 21, and the downstream end 53b is located at a position not facing any of the outlets 21-23.

The movable flow path 51 changes the communication state between the inflow port 34 and the outflow ports 21 and 22 by rotating the valve body 41. More specifically, as shown in FIGS. 6 and 7, the movable flow path 51 faces the outflow port 21 at the downstream end 53b when the rotation phase of the valve body 41 becomes the first rotation phase. .. At this time, the downstream end 54b is located at an intermediate portion between the outlet 21 and the outlet 23. Further, as shown in FIG. 9, the movable flow path 51 faces the outflow port 21 at the downstream end 54b when the rotation phase of the valve body 41 becomes the second rotation phase. At this time, the downstream end 53b is located at an intermediate portion between the outlet 21 and the outlet 22. Further, as shown in FIG. 11, the movable flow path 51 faces the outflow port 22 at the downstream end 53b when the rotation phase of the valve body 41 becomes the third rotation phase. At this time, the downstream end 54b is located at an intermediate portion between the outlet 21 and the outlet 22.

As shown in FIGS. 8 and 9, the upstream end 55a of the movable flow path 55 is opened at a portion of the end surface 45 that is radially outwardly displaced from the axis L1 (upstream end 52a). The downstream end 55b of the movable flow path 55 is an outer peripheral surface 47, and is opened at a position separated from the downstream end 54b with the downstream end 53b interposed therebetween.

The movable flow path 55 changes the communication state between the inflow port 36 and the outflow port 22 as the valve body 41 rotates. More specifically, as shown in FIG. 7, when the rotation phase of the valve body 41 becomes the first rotation phase, the upstream end 55a does not face any of the inflow ports 34 and 36, and the upstream end 55a does not face any of the inflow ports 34 and 36. The downstream end 55b is located in the middle portion between the outlet 21 and the outlet 22. Further, as shown in FIGS. 8 and 9, when the rotation phase of the valve body 41 becomes the second rotation phase, the upstream end 55a faces the inflow port 36 and the downstream end 55b becomes the outflow port 22. opposite. Further, as shown in FIGS. 10 and 11, when the rotation phase of the valve body 41 becomes the third rotation phase, the upstream end 55a does not face any of the inflow ports 34 and 36, and the upstream end 55a does not face any of the inflow ports 34 and 36. The downstream end 55b is located at an intermediate portion between the outlet 22 and the outlet 23.

As shown in FIGS. 6 and 7, the upstream end 61a of the movable flow path 61 is opened at a portion of the end surface 45 of the valve body 44 that is radially outwardly displaced from the axis L1 (upstream end 52a). ing. The downstream end 61b of the movable flow path 61 is an outer peripheral surface 47, and is opened at a position separated from the downstream end 53b with the downstream end 54b interposed therebetween.

The movable flow path 61 changes the communication state between the inflow port 36 and the outflow port 23 as the valve body 41 rotates. More specifically, when the rotation phase of the valve body 41 becomes the first rotation phase, the upstream end 61a faces the inflow port 36 and the downstream end 61b faces the outflow port 23. Further, as shown in FIGS. 8 and 9, when the rotation phase of the valve body 41 becomes the second rotation phase, the upstream end 61a does not face any of the inflow ports 34 and 36. The downstream end 61b is located at an intermediate portion between the outlet 21 and the outlet 23. Further, as shown in FIGS. 10 and 11, when the rotation phase of the valve body 41 becomes the third rotation phase, the upstream end 61a does not face any of the inflow ports 34 and 36, and the upstream end 61a does not face any of the inflow ports 34 and 36. The downstream end 61b faces the outflow port 21. However, the upstream end 61a faces the inflow opening 67 of the inflow side packing 65, which will be described later, and does not face the inflow ports 34 and 36, and is sealed by the second seal portion 72.

The valve body 41 having the above configuration is rotated by a motor (not shown), a manual operation, or the like.
<Inflow side packing 65>
As shown in FIGS. 3, 5 and 6, inflow side packings are provided at each inflow port 34 and 36. The inflow side packings for each of the inflow ports 34 and 36 are connected to form one inflow side packing 65. Most of the inflow side packing 65 is made of an elastic material such as rubber.

The inflow side packing 65 includes a packing main body portion 66, a first seal portion 71, and a second seal portion 72. The packing main body 66 is a portion constituting the skeleton portion of the inflow side packing 65, and has a plate shape with the direction along the axis L1 as its own thickness direction.

The packing main body 66 has the same number of inflow openings 67 as or more than the inflow ports 34 and 36. In the present embodiment, the packing main body 66 has an inflow opening 67 which is one more than the inflow ports 34 and 36. Each inflow opening 67 is composed of circular holes having a diameter similar to that of the inflow ports 34 and 36. The two inflow openings 67 are formed in the packing main body 66 at locations facing the inflow ports 34 and 36. The remaining inflow opening 67 is formed in the packing main body 66 at a position not facing any of the inflow ports 34 and 36.

The first seal portion 71 is a surface of the packing main body 66 on the cover 31 side, is formed around each inflow opening 67, and has an annular shape. In the present embodiment, two seal portions having different diameters are formed as the first seal portion 71, but one or three or more seal portions may be formed. Adjacent first seal portions 71 are connected to each other. A part of the first seal portion 71 is in contact with the inner bottom surface of the housing 11 (the inner bottom surface of the recess 32) around the inflow ports 34 and 36.

Further, the second seal portion 72 is a surface of the packing main body portion 66 on the valve main body portion 44 side, is formed around each inflow opening 67, and has an annular shape. Adjacent second seal portions 72 are connected to each other. The second seal portion 72 corresponding to the inflow port 34 is in contact with the end surface 45 around the upstream end 52a of the movable flow path 51 regardless of the rotation phase of the valve body 41. The second seal portion 72 corresponding to the inflow port 36 is in contact with the end surface 45, but in particular, when the upstream ends 55a and 61a of the movable flow paths 55 and 61 face the inflow port 36, the upstream end 55a , 61a, in contact with the end face 45.

<Outflow side packing 75>
As shown in FIGS. 3 and 7, the outflow side packing 75 is arranged between each protruding wall portion 15 and the outer peripheral surface 47 of the valve main body portion 44. Each outflow side packing 75 has the same structure as each other.

Each outflow side packing 75 includes a packing main body portion 76, a third seal portion 81, and a fourth seal portion 82. Each packing main body 76 is a portion constituting the skeleton portion of the outflow side packing 75, and has a plate shape with the radial direction of the valve main body 44 as its own thickness direction.

Each packing main body 76 has an outflow opening 78 at a position facing the outflow ports 21 to 23. Each outflow opening 78 is composed of circular holes having a diameter similar to that of the outlets 21 to 23.

Each third seal portion 81 is a surface of the packing main body portion 76 on the peripheral wall portion 13 side, and is formed in an annular shape around the outflow opening 78. Each third seal portion 81 is in contact with the protruding wall portion 15 around the outlets 21 to 23.

Further, each of the fourth seal portions 82 is a surface of the packing main body portion 76 on the valve main body portion 44 side, and is formed in an annular shape around the outflow opening 78. Each of the fourth seal portions 82 is in contact with the outer peripheral surface 47 of the valve body portion 44, and in particular, the downstream ends 53b, 54b, 55b, 61b of the movable flow paths 51, 55, 61 are located at the outlets 21 to 23. When they face each other, they come into contact with the outer peripheral surface 47 around the downstream ends 53b, 54b, 55b, 61b.

Next, the operation of the present embodiment configured as described above will be described separately for each rotation phase. In addition, the effects caused by the action will also be described.
As shown in FIG. 6, the fluid FL1 flowing through the flow path 86 is sent to the inflow port 34 via the connecting pipe portion 35. The fluid FL2 flowing through the flow path 88 is sent to the inflow port 36 via the connecting pipe portion 37. In this way, a plurality of fluids FL1 and FL2 are sent to each of the inflow ports 34 and 36.

<First rotation phase>
As shown in FIGS. 6 and 7, in the first rotation phase, the upstream end 52a of the common flow path portion 52 faces the inflow port 34, and the downstream end 53b of the branch flow path portion 53 faces the outflow port 21. do. The inflow port 34 and the outflow port 21 are communicated with each other by a movable flow path 51. The downstream end 54b of the branch flow path portion 54 does not face any of the outlets 21 to 23. Therefore, the fluid FL1 flows from the inflow port 34 through the upstream end 52a into the common flow path portion 52, is guided to the outflow port 21 by the branch flow path portion 53, and then enters the flow path 92 via the connection pipe portion 24. It is leaked.

Further, in the movable flow path 55, the upstream end 55a does not face any of the inflow ports 34 and 36, and the downstream end 55b does not face any of the outflow ports 21-23. The movable flow path 55 is in a state in which both the upstream end 55a and the downstream end 55b are closed. Further, in the movable flow path 61, the upstream end 61a faces the inflow port 36, and the downstream end 61b faces the outflow port 23. The inflow port 36 and the outflow port 23 are communicated with each other by the movable flow path 61.

Therefore, the fluid FL2 flows from the inflow port 36 into the upstream end 61a, is guided to the outflow port 23 by the movable flow path 61, and then flows out to the flow path 96 through the connecting pipe portion 26. The outflow port 22 is in a closed state, and the fluids FL1 and FL2 do not flow out from the outlet 22.

Here, since the three movable flow paths 51, 55, and 61 are independent of each other, it is possible to prevent the fluids FL1 and FL2 from being mixed inside the valve body 41.
Further, regardless of the rotation phase, the first seal portion 71 of the inflow side packing 65 always comes into contact with the cover 31 around the inflow ports 34 and 36. Therefore, between the valve body portion 44 and the cover 31, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of each first seal portion 71 via the first seal portion 71. Is regulated.

Further, regardless of the rotation phase, the second seal portion 72 of the inflow side packing 65 always comes into contact with the end surface 45 around the upstream end 52a. Therefore, between the valve body portion 44 and the cover 31, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of the second seal portion 72 via the second seal portion 72. Is regulated.

Further, regardless of the rotation phase, the third seal portion 81 of each outflow side packing 75 always comes into contact with the peripheral wall portion 13 around each of the outlets 21 to 23. Therefore, between the valve body portion 44 and the peripheral wall portion 13, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of each third seal portion 81 via the third seal portion 81. Is regulated.

Further, in the first rotation phase, the second seal portion 72 of the inflow side packing 65 comes into contact with the end surface 45 around the upstream end 61a. Therefore, between the valve body portion 44 and the cover 31, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of the second seal portion 72 via the second seal portion 72. Is regulated.

Further, the fourth seal portion 82 of the outflow side packing 75 arranged to face the outflow ports 21 and 23 comes into contact with the outer peripheral surface 47 around the downstream ends 53b and 61b. The fourth seal portion 82 of the outflow side packing 75 arranged to face the outflow port 22 comes into contact with the outer peripheral surface 47 at a position far away from the downstream ends 53b, 54b, 55b, 61b. Therefore, between the valve body portion 44 and the peripheral wall portion 13, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of each of the fourth seal portions 82 via the fourth seal portion 82. Is regulated.

Therefore, it is possible to prevent the fluids FL1 and FL2 from being mixed between the valve main body 44 and the cover 31 and between the valve main body 44 and the peripheral wall portion 13.
<Second rotation phase>
When the valve body 41 is rotated in the counterclockwise direction of FIG. 7 from the first rotation phase, the downstream portion of the movable flow path 51 moves around the axis L1. Due to this movement, the positions of the downstream ends 53b and 54b of the movable flow path 51 in the circumferential direction of the valve body 41 change. When the valve body 41 is rotated to the second rotation phase, as shown in FIGS. 8 and 9, the downstream end 53b does not face any of the outlets 21 to 23, whereas the downstream end 54b Facing the outlet 21. Therefore, the fluid FL1 flows from the inflow port 34 into the upstream end 52a, is guided to the outflow port 21 through the common flow path portion 52 and the branch flow path portion 54, and then is guided to the outflow port 21 via the connecting pipe portion 24. Is leaked to.

Further, with the rotation of the valve body 41, the entire movable flow path 55 and the entire movable flow path 61 move around the axis L1, respectively. Due to these movements, the positions of the upstream end 55a and the downstream end 55b of the movable flow path 55 in the circumferential direction of the valve body 41 change, and the positions of the upstream end 61a and the downstream end 61b of the movable flow path 61 change. Change.

The upstream end 61a no longer faces the inflow port 36, and the downstream end 61b no longer faces any of the outlets 21-23. In the movable flow path 61, both the upstream end 61a and the downstream end 61b are closed. On the other hand, the upstream end 55a faces the inflow port 36, and the downstream end 55b faces the outflow port 22. The inflow port 36 and the outflow port 22 are communicated with each other by the movable flow path 55. Therefore, the fluid FL2 flows from the inflow port 36 into the upstream end 55a, is guided to the outflow port 22 by the movable flow path 55, and then flows out to the flow path 94 via the connecting pipe portion 25. The outflow port 23 is in a closed state, and the fluids FL1 and FL2 do not flow out from the outlet 23.

Further, of the inflow side packing 65, the second seal portion 72 corresponding to the inflow port 36 comes into contact with the end surface 45 around the upstream end 55a. Therefore, between the valve body portion 44 and the cover 31, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of the second seal portion 72 via the second seal portion 72. Is regulated.

Further, the fourth seal portion 82 of the outflow side packing 75 arranged to face the outflow ports 21 and 22 comes into contact with the outer peripheral surface 47 around the downstream ends 54b and 55b. The fourth seal portion 82 of the outflow side packing 75 arranged to face the outflow port 23 comes into contact with the outer peripheral surface 47 at a position far away from the downstream ends 53b, 54b, 55b, 61b. Therefore, between the valve body portion 44 and the peripheral wall portion 13, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of each of the fourth seal portions 82 via the fourth seal portion 82. Is regulated.

Therefore, it is possible to prevent the fluids FL1 and FL2 from being mixed between the valve main body 44 and the cover 31 and between the valve main body 44 and the peripheral wall portion 13.
<Third rotation phase>
When the valve body 41 is rotated in the counterclockwise direction of FIG. 9 from the second rotation phase, the bifurcated flow path portions 53 and 54 of the movable flow path 51 move around the axis L1. When the valve body 41 is rotated to the third rotation phase, as shown in FIGS. 10 and 11, the downstream end 53b faces the outlet 22, whereas the downstream end 54b faces any of the outlets 21. It will not face ~ 23 either. The inflow port 34 and the outflow port 22 are in a state of communicating with each other via the common flow path portion 52 and the branch flow path portion 53 of the movable flow path 51. Therefore, the fluid FL1 flows into the upstream end 52a from the inflow port 34, is guided to the outflow port 22 by the common flow path portion 52 and the branch flow path portion 53, and then flows out to the flow path 94 via the connection pipe portion 25. Will be done.

Further, with the rotation of the valve body 41, the entire movable flow path 55 and the entire movable flow path 61 move around the axis L1, respectively. The upstream end 55a does not face any of the inflow ports 34 and 36, and the downstream end 55b does not face any of the outlets 21-23. The movable flow path 55 is in a state where both the upstream end 55a and the downstream end 55b are closed.

Further, the upstream end 61a of the movable flow path 61 does not face any of the inflow ports 34 and 36, and the downstream end 61b faces the outflow port 21. The movable flow path 61 is in a state where the upstream end 61a is closed. At this time, the upstream end 61a faces one inflow opening 67 of the inflow side packing 65. The second seal portion 72 comes into contact with the end surface 45 around the upstream end 61a, and the upstream end 61a is sealed. If this seal is not made, if the fluid in the flow path 92 flows into the movable flow path 61 (backflow) via the outflow port 21 and the downstream end 61b, the fluid FL2 in the movable flow path 61 flows upstream. It enters the gap between the valve body 44 and the housing 11 from the end 61a. This fluid FL2 may enter the branch flow path portion 54 from the unsealed downstream end 54b and mix with the fluid FL1 flowing in from the inflow port 34. However, in the present embodiment, the fluid FL2 that intends to flow back through the movable flow path 61 is stopped by the second seal portion 72. Therefore, it is possible to prevent the fluid FL2 from entering the branch flow path portion 54 and mixing with the fluid FL1.

Both the communication state of the inflow port 36 with the outflow port 22 and the communication state with the outflow port 23 are cut off. The fluid FL2 cannot flow into the movable flow paths 55 and 61, and does not flow out from any of the outlets 21 to 23.

Further, the second seal portion 72 of the inflow side packing 65 corresponding to the inflow port 36 comes into contact with the end surface 45 at a position far away from the upstream ends 52a, 55a, 61a. Therefore, between the valve body portion 44 and the cover 31, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of the second seal portion 72 via the second seal portion 72. Is regulated.

Further, the fourth seal portion 82 of the outflow side packing 75 arranged to face the outflow ports 21 and 22 comes into contact with the outer peripheral surface 47 around the downstream ends 53b and 61b. The fourth seal portion 82 of the outflow side packing 75 arranged to face the outflow port 23 comes into contact with the outer peripheral surface 47 at a position far away from the downstream ends 53b, 54b, 55b, 61b. Therefore, between the valve body portion 44 and the peripheral wall portion 13, the fluids FL1 and FL2 move back and forth between the inner region and the outer region of each of the fourth seal portions 82 via the fourth seal portion 82. Is regulated.

Therefore, it is possible to prevent the fluids FL1 and FL2 from being mixed between the valve main body 44 and the cover 31 and between the valve main body 44 and the peripheral wall portion 13.
When the valve body 41 is rotated in the clockwise direction from the third rotation phase, each part of the rotary valve 10 operates in the opposite direction to the above, and the inflow port by the movable flow paths 51, 55, 61 The communication state between 34 and 36 and the outlets 21 to 23 is switched.

As described above, according to the present embodiment, the fluid FL1 is formed by rotating the valve body 41 to change the communication state between the inflow ports 34 and 36 and the outflow ports 21 to 23, even though the rotary valve 10 is used. , FL2 can be switched. Further, in the state after switching, it is possible to prevent the fluids FL1 and FL2 from being mixed regardless of the rotation phase.

According to this embodiment, the following effects can be obtained in addition to the above.
In the movable flow path 51, the upstream portion in the flow direction of the fluid FL1 is composed of one common flow path portion 52, and the downstream portion is composed of two branch flow path portions 53 and 54. Therefore, the space occupied by the movable flow path in the valve main body 44 is smaller than that in the case where the movable flow path 51 does not branch from an intermediate portion in the flow direction of the fluid FL1 and is composed of a plurality of flow paths separated from each other. As a result, the valve body 44 can be downsized.

It should be noted that the above embodiment can also be implemented as a modified example in which this is modified as follows. The above embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.

-In the above embodiment, at least one of the inflow ports 34 and 36 may be changed to the outflow port. Further, at least one of the outlets 21 to 23 may be changed to the inlet.
The housing 11 may be made of a member different from the body 12 and the cover 31, provided that the housing portion 38 is provided. This modification includes the addition of another member to the body 12 and the cover 31.

-The housing 11 may be provided with three or more inflow ports. Further, the housing 11 may be provided with two or four or more outlets. If there are no restrictions on the physique of the housing 11, it is possible to establish an infinite number of combinations of the number of inlets and the number of outlets. In other words, it is possible to increase the types of communication states between multiple inlets and multiple outlets without limitation.

-All of the plurality of inflow ports may be provided in the body 12 instead of the cover 31. Further, a part of the plurality of inflow ports may be provided on the cover 31, and the rest may be provided on the body 12.
-All of the plurality of outlets may be provided on the cover 31 instead of the body 12. Further, a part of the plurality of outlets may be provided on the body 12, and the rest may be provided on the cover 31.

The valve body 44 may be formed in a spherical shape instead of a columnar shape.
-In the case of a movable flow path having a branch flow path portion, the number of the branch flow path portions may be 3 or more.
-The number of movable flow paths in the valve body 41 may be changed to 1 or 3 or more. When there is one movable flow path, it may be branched into a plurality of movable flow paths in the middle.

-Each part of the inflow side packing 65 may be formed at each of the inflow ports 34 and 36 in a state of being separated from each other.
-The rotary valve can also be applied to a case where the rotary valve is provided in the middle of a plurality of flow paths through which a liquid of a type different from that of cooling water is flowed as a fluid. Further, the rotary valve can also be applied to a case where the rotary valve is provided in the middle of a plurality of flow paths through which a gas flows instead of a liquid as a fluid. Further, the rotary valve can be applied even when it has a flow path through which a liquid flows and a flow path through which a gas flows, and is provided in the middle of those flow paths.

10 ... Rotary valve 11 ... Housing 21, 22, 23 ... Outlet 34, 36 ... Inlet 38 ... Accommodating part 41 ... Valve body 42 ... Shaft part 44 ... Valve body part 45, 46 ... End face 47 ... Outer surface 51, 55 , 61 ... Movable flow path 52a, 55a, 61a ... Upstream end 53, 54 ... Branch flow path portion 53b, 54b, 55b, 61b ... Downstream end 65 ... Inflow side packing 67 ... Inflow opening 71 ... First seal portion 72 ... First 2 Seal part 75 ... Outflow side packing 78 ... Outflow opening 81 ... 3rd seal part 82 ... 4th seal part FL1, FL2 ... Fluid L1 ... Axial line

Claims (3)

A housing having an accommodating portion and a valve body having a valve main body accommodating in the accommodating portion and rotatably supported by the housing by a shaft portion are provided.
At a portion of the housing facing the accommodating portion, a plurality of inflow ports into which a plurality of fluids flow in are formed, and a plurality of outlets through which the fluid flows out are formed.
The valve body is a passage for the fluid, and the upstream end and the downstream end in the flow direction of the fluid are opened on the outer surface of the valve body portion, and at least a part of the valve body moves as the valve body rotates. As a result, a plurality of movable flow paths that change the communication state between the plurality of inflow ports and the plurality of outlets are formed in a state of being separated from each other.
Further, an inflow side packing is arranged between each inflow port and the valve main body portion, and an outflow side packing is arranged between each outflow port and the valve main body portion.
Each inflow side packing includes an inflow opening that opens facing each inflow port, an annular first seal portion that is provided around the inflow opening and contacts the periphery of the inflow port in the housing, and the inflow opening. It is provided with an annular second seal portion provided around the valve body and in contact with the valve body portion.
Each outflow side packing has an outflow opening that opens facing each outflow port, an annular third seal portion that is provided around the outflow opening and contacts the periphery of the outflow port in the housing, and the outflow opening. A rotary valve provided around the valve body and provided with an annular fourth seal portion that comes into contact with the valve body portion. The valve body has a columnar shape,
The shaft portion protrudes along the coaxial line from one end surface in the direction along the axis line of the valve body portion.
The upstream end of each movable flow path is opened at the other end face of the valve body in the direction along the axis.
The downstream end of each movable flow path is opened on the outer peripheral surface of the valve body portion.
The housing includes an inner bottom surface of the valve body that faces the other end surface, and an inner peripheral surface of the valve body that faces the outer peripheral surface.
The rotary valve according to claim 1, wherein each inflow port is opened at the inner bottom surface of the housing, and each outlet is opened at the inner peripheral surface of the housing. At least one of the plurality of movable flow paths has a branch flow path portion that branches into a plurality of portions in a region from an intermediate portion in the flow direction to the outer peripheral surface.
At the downstream end of each branch flow path portion, the downstream end of one branch flow path portion faces the outlet, and the downstream end of the remaining branch flow path portion faces any of the outlets. The rotary valve according to claim 2, which is formed in a place where the valve is not used.

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