JP2022131892A - rotary valve - Google Patents

Abstract

To secure a seal function and inhibit increase of rotation torque of a valve body.SOLUTION: A housing 11 has a housing part 36, and a valve body 51 includes a valve body part 52 and a shaft part 61. The housing 11 has a first facing wall surface 34 and a second facing wall surface 15 which sandwich the housing part 36 from both sides as seen in a direction along an axis L1 of the shaft part 61 and face each other. The valve body 51 has: a first end surface 53 which faces the first facing wall surface 34; and a second end surface 67 which contacts with the second facing wall surface 15. The shaft part 61 is located closer to the second facing wall surface 15 side than the valve body part 52. An inflow side packing 81 is disposed between the first facing wall surface 34 and the first end surface 53. The shaft part 61 has the second end surface 67 and is formed by a component formed separately from the valve body part 52 having the first end surface 53. The shaft part 61 is connected to the valve body part 52 so as to move in the direction along the axis L1 and rotate integrally with the valve body part 52. Between the shaft part 61 and the valve body part 52, an elastic member 78 which biases those components to both sides as seen in the direction along the axis L1 is disposed.SELECTED DRAWING: Figure 6

Description

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

2. Description of the Related Art As a rotary valve for switching fluid flow paths, a rotary valve that includes a housing having an accommodating portion and a valve body is known. The housing has an inflow port and an outflow port for the fluid, which face the accommodating portion. The valve body has a valve body portion housed in the housing portion, and a shaft portion rotatably supporting the valve body portion to the housing. A movable flow passage is formed in the valve main body to communicate the inflow port and the outflow port. By rotating the valve body about the shaft, the outflow port communicating with the inflow port via the movable flow path is switched, and the flow path of the fluid is switched.

The housing has a first opposing wall surface and a second opposing wall surface that face each other with the accommodating portion sandwiched from both sides in the direction along the axis of the shaft portion. The valve body has a first end surface facing the first opposing wall surface and a second end surface contacting the second opposing wall surface. The shaft portion is located closer to the second opposing wall surface than the valve body portion.

As the rotary valve described above, for example, there is a rotary valve in which a packing is arranged between a first opposing wall surface and a first end surface, as described in Japanese Unexamined Patent Application Publication No. 2002-200012. In this type of rotary valve, by compressing the packing, the packing generates a reaction force (hereinafter referred to as "compression reaction force") that pushes back the valve body and the housing to both sides in the direction along the axis. In the rotary valve, the compression reaction force seals between the first opposing wall surface and the first end surface.

JP 2009-180240 A

However, the rotary valve described above may have the following problems depending on variations in the dimensions of the components that make up the rotary valve. The packing absorbs the variations to some extent by elastically deforming. However, if the variation is larger than the packing can absorb the variation, a gap may occur between the valve main body and the packing, failing to ensure the sealing function. This problem can be solved by compressing the packing more and increasing the compression reaction force. On the other hand, as the compressive reaction force of the packing increases, the sliding resistance generated between the first end face and the packing increases as the valve body rotates. Further, as the valve body rotates, the sliding resistance generated between the second end surface and the second opposing wall surface increases. As a result, the rotational torque required to rotate the valve body increases.

Variations in the dimensions of the parts include variations that occur when the parts are manufactured, and variations due to environmental factors such as temperature after manufacturing the rotary valve.

A rotary valve that solves the above problems comprises: a housing having an accommodating portion and a fluid inlet and an outlet facing the accommodating portion; A valve body having a movable flow path communicating with an outflow port, and a shaft for rotatably supporting the valve body on the housing. and a valve body for switching the outflow port communicating with the inflow port via the movable flow path, wherein the housing is opposed to each other with the accommodating portion sandwiched from both sides in the direction along the axis of the shaft portion. The valve body has a first end face facing the first facing wall surface and a second end face contacting the second facing wall face, and the shaft is positioned closer to the second opposing wall surface than the valve body portion, and further includes a packing disposed between the first opposing wall surface and the first end surface, wherein the shaft portion is the The valve main body is composed of parts different from the valve main body, the valve main body has the first end face, the shaft has the second end face, the shaft has the valve main body, The shaft and the valve body are connected to each other so as to be movable in the direction along the axis and to be rotatable together, and the shaft and the valve body are biased to both sides in the direction along the axis. An elastic member is arranged.

According to the above configuration, when the shaft is rotated, the rotation is transmitted to the valve body, and the valve body is rotated integrally with the shaft. The elastic member also rotates together with the stem and valve body. Rotation of the valve main body switches the outflow port communicating with the inflow port via the movable flow path, thereby switching the flow path of the fluid.

In the rotary valve, as the packing is compressed between the first opposing wall surface and the first end surface, the packing exerts a compression reaction force that pushes back the valve body and the housing to both sides in the direction along the axis. occur. Further, as the elastic member is compressed between the shaft portion and the valve body portion, a compression reaction force is generated in the elastic member to push back the shaft portion and the valve body portion to both sides in the direction along the axis.

The second end surface of the shaft portion is pressed against the second opposing wall surface of the housing by the compression reaction force of both the packing and the elastic member.
The valve body is pressed against the packing by the compression reaction force of the elastic member. Moreover, the compressive reaction force of the packing is applied to the first end surface and the first opposing wall surface. A space between the first opposed wall surface and the first end surface is sealed by the compression reaction force of both the elastic member and the packing.

By the way, the packing and the elastic member are each elastically deformed to absorb variations in the dimensions of the parts constituting the rotary valve. Since the elastic member is added to the packing, the ability to absorb variations in the dimensions of the component parts is enhanced compared to the packing alone. It is not necessary to increase the compression reaction force by compressing the packing more in order to absorb the variation.

Therefore, by appropriately compressing the packing to generate a compression reaction force, it is possible to properly seal the space between the first opposed wall surface and the first end surface regardless of variations in the dimensions of the parts constituting the rotary valve. It becomes possible. The rotation of the valve body is performed with the first end surface in contact with the packing and the second end surface in contact with the second opposing wall surface. However, since the compression reaction force is appropriate as described above, sliding resistance between the first end surface and the packing is also generated between the second end surface and the second opposing wall surface as the valve body rotates. Sliding resistance does not become excessive. As a result, an increase in rotational torque required to rotate the valve body is suppressed.

In the above rotary valve, it is preferable that the shaft portion and the member of the housing that has the second opposing wall surface are made of either one of a resin material and a metal material.

The valve body is rotated while the second end surface of the shaft portion is in contact with the second opposing wall surface of the housing. Therefore, if the shaft portion and the member having the second opposing wall surface in the housing are made of materials that are significantly different in wear resistance, the member with the lower wear resistance will be deformed by the rotation. Wear may occur.

In this respect, according to the above configuration, the shaft portion and the member of the housing having the second facing wall surface are made of either one of the resin material and the metal material, and are wear-resistant. are not significantly different. Therefore, the shaft portion and the housing are less likely to wear even if they rotate relative to each other while in contact with each other.

According to the above rotary valve, it is possible to suppress an increase in rotational torque of the valve body while ensuring a sealing function.

A perspective view of a rotary valve. The top view of a rotary valve. FIG. 2 is an exploded perspective view of the rotary valve viewed from the body side; FIG. 3 is an exploded perspective view of the rotary valve as seen from the cover side; 5-5 line cross-sectional view of FIG. FIG. 6 is an exploded sectional view of FIG. 5; 7-7 line cross-sectional view of FIG. 8-8 line partial cross-sectional view of FIG. FIG. 8 is a plan view showing the inflow side packing and the elastic member extracted from FIG. 7 ;

An embodiment of a rotary valve that is provided in the middle of a plurality of fluid flow paths and switches the flow paths will be described below with reference to the drawings.
Here, fluid includes either one or both of liquid and gas. In addition, the plurality of fluids includes a plurality of types of fluids having different components as well as a plurality of fluids of the same type. A plurality of fluids of the same type includes a plurality of fluids of the same type, and a plurality of fluids having the same components but different temperature or other factors such as viscosity. In this embodiment, two types of cooling water having the same components but different temperatures are used as fluids. As the fluid, a liquid different from cooling water may be used.

As shown in FIGS. 3 and 4 , the rotary valve 10 includes a housing 11 , a valve body 51 , an elastic member 78 , an inflow side packing 81 and a plurality of outflow side packings 91 . Next, each member will be described.

<Housing 11>
As shown in FIGS. 1 and 2, housing 11 includes body 12 and cover 31 . The body 12 has a cylindrical peripheral wall portion 13 extending along the axis L1 of the shaft portion 61, which will be described later. One end of the peripheral wall portion 13 in the direction along the axis L<b>1 is closed by the closing portion 14 . The other end of the peripheral wall portion 13 is an open end (see FIG. 4).

The peripheral wall portion 13 is formed with a plurality of projecting wall portions 16 each projecting outward in the radial direction. In this embodiment, the projecting wall portions 16 are formed at equal angles. As shown in FIGS. 3 and 4, an annular recess 17 recessed toward the closed portion 14 is formed in the peripheral portion of the open end of the peripheral wall portion 13 . A cylindrical bearing portion 18 extending along the axis L1 is formed in the central portion of the closing portion 14 (see FIG. 6).

The cover 31 is arranged adjacent to the open end of the peripheral wall portion 13 . An annular protrusion 32 that protrudes toward the body 12 is formed on the peripheral edge of the cover 31 . Most of the area of the cover 31 surrounded by the annular projection 32 is composed of a flat portion 33 . The plane portion 33 has a mounting portion 33a on which the inflow side packing 81 is mounted in a region including the axis L1. Projections 35 for positioning the inflow-side packing 81 are formed at a plurality of mutually spaced locations of the mounting portion 33a (see FIG. 6). The annular protrusion 32 of the cover 31 is joined to the body 12 while being inserted into the annular recess 17 .

As shown in FIG. 5, a space surrounded by the body 12 and the cover 31 constitutes a housing portion 36. As shown in FIG. The housing 11 has a first opposing wall surface 34 and a second opposing wall surface 15 that face each other with the accommodating portion 36 sandwiched from both sides in the direction along the axis L1. As shown in FIGS. 3 and 5 , the first opposing wall surface 34 is composed of the plane portion 33 . The first opposing wall surface 34 faces the housing portion 36 in a state perpendicular to the axis L1. The second opposing wall surface 15 is formed by the surface of the bearing portion 18 on the first opposing wall surface 34 side. The second opposing wall surface 15 faces the accommodating portion 36 while surrounding the axis L1.

An inlet 41 for the fluid FL1 is formed in the central portion of the planar portion 33 . A connecting pipe portion 42 is formed on the periphery of the inlet 41 of the cover 31 and protrudes away from the accommodating portion 36 . A pipe 102 having a flow path 101 for the fluid FL1 is connected to the connection pipe portion 42 . In addition, an inlet 43 for the fluid FL2 is formed at a portion of the flat portion 33 that is shifted outward in the radial direction from the inlet 41 . A connection pipe portion 44 is formed on the periphery of the inlet 43 of the cover 31 and protrudes away from the housing portion 36 . A pipe 104 having a flow path 103 for the fluid FL2 is connected to the connecting pipe portion 44 .

As shown in FIGS. 7 and 8, each protruding wall portion 16 is formed with one of outflow ports 21 to 23 . These outflow ports 21 to 23 are open facing the accommodation portion 36 . Connection pipe portions 24 to 26 protrude outward in the radial direction of the body 12 from respective peripheral edge portions of the outflow ports 21 to 23 in the projecting wall portion 16 . A pipe 112 having a flow channel 111 is connected to the connecting pipe portion 24, a pipe 114 having a flow channel 113 is connected to the connecting pipe portion 25, and a pipe 116 having a flow channel 115 is connected to the connecting pipe portion 26. is connected.

<Valve body 51>
As shown in FIGS. 3 and 4 , the valve body 51 has a valve body portion 52 and a shaft portion 61 . The valve body 51 has a first end surface 53 (see FIG. 4) facing the first opposing wall surface 34 and a second end surface 67 (see FIG. 3) contacting the second opposing wall surface 15 .

The valve body portion 52 and the shaft portion 61 are configured by different parts. The valve main body portion 52 is a portion forming a skeleton portion of the valve body 51 and is formed in a cylindrical shape. The surface of the valve body portion 52 on the side of the first opposing wall surface 34 is perpendicular to the axis L<b>1 and constitutes the first end surface 53 . An outer peripheral surface 54 of the valve body portion 52 is formed of a cylindrical surface centered on the axis L1.

The shaft portion 61 is located closer to the second opposing wall surface 15 than the valve body portion 52 and has the axis L1. The shaft portion 61 is connected to the valve body portion 52 so as to be movable in the direction along the axis L1 and to be integrally rotatable. This connection is made by fitting a fitting projection 56 provided on one of the valve body 52 and the shaft 61 to a fitted portion 66 provided on the other.

More specifically, as shown in FIGS. 3, 4, and 6, the peripheral edge portion of the end surface 57 of the valve body portion 52 on the side of the second opposing wall surface 15 is provided with an annular ring protruding toward the second opposing wall surface 15. , an annular protrusion 55 is formed. The fitting projections 56 are regions of the valve body 52 surrounded by the annular projection 55, and are formed at a plurality of locations spaced apart from each other in the circumferential direction on an imaginary circle centered on the axis L1. there is Each fitting protrusion 56 protrudes from the end surface 57 of the valve body 52 toward the second opposing wall surface 15 .

The shaft portion 61 includes a shaft body portion 62 , an annular portion 63 , a connecting portion 64 and a flange portion 65 . The shaft body portion 62 has a columnar shape extending along the axis L1. The annular portion 63 has an annular shape, is positioned in a region surrounded by the annular protrusion 55 of the valve body portion 52 , and surrounds the end portion of the shaft body portion 62 on the first opposing wall surface 34 side. The connecting portion 64 connects the end portion of the annular portion 63 on the side of the first opposing wall surface 34 to the shaft body portion 62 . The surface of the connecting portion 64 on the side of the second opposing wall surface 15 constitutes the second end surface 67 . The flange portion 65 is formed around the end portion of the annular portion 63 on the side of the second opposing wall surface 15 and has an annular shape. The flange portion 65 is formed with a slightly smaller diameter than the annular protrusion 55 (see FIG. 5).

The fitted portions 66 are formed at a plurality of locations spaced apart from each other in the circumferential direction of the annular portion 63 of the shaft portion 61 . In this embodiment, the plurality of fitted portions 66 are formed on the annular portion 63 at equal angles. Each fitted portion 66 penetrates the annular portion 63 in the direction along the axis L1.

As shown in FIG. 5 , each fitting protrusion 56 is fitted to the corresponding fitted part 66 . In this state, a housing space 68 for housing the elastic member 78 is formed between the end face 57 and the flange portion 65 in the region between the plurality of fitting protrusions 56 and the annular protrusion 55 . be done.

The entire valve body portion 52 and the portion of the shaft portion 61 excluding the shaft body portion 62 are housed in the housing portion 36 , and the shaft body portion 62 is inserted through the bearing portion 18 . The shaft portion 61 is rotatably supported with respect to the body 12 at the bearing portion 18 . An O-ring 69 is interposed between the shaft body portion 62 and the bearing portion 18 . Instead of the O-ring 69, a seal member may be interposed between the shaft main body 62 and the bearing 18 so that the coaxial main body 62 can slide.

Here, both the shaft portion 61 having the second end surface 67 and the body 12 having the second opposing wall surface 15 are made of a resin material. The material forming the shaft portion 61 and the material forming the body 12 may be the same type of resin material, or may be different types of resin material.

As shown in FIGS. 6 and 8, the valve body 52 is formed with one movable flow path 71 through which the fluid FL1 flows, and two movable flow paths 75 and 77 through which the fluid FL2 flows.
The movable channel 71 is composed of one common channel portion 72 forming its upstream portion and two branch channel portions 73 respectively forming downstream portions. An upstream end 71 a of the movable channel 71 is open at the center of the first end face 53 and faces the inlet 41 . A downstream end 71 b of each branch flow path portion 73 is open at the outer peripheral surface 54 . As the valve element 51 rotates, the branched flow path portions 73 move (swirl), so that the inlet 41 and the outlets 22 and 23 communicate with each other through the movable flow path 71 . to change

An upstream end 75a of the movable flow path 75 is open at a portion of the first end surface 53 that is radially outwardly displaced from the axis L1 (upstream end 71a). A downstream end 75 b of the movable flow path 75 is open at the outer peripheral surface 54 . As the valve element 51 rotates, the entire movable passage 75 moves (turns) around the axis L1, thereby moving the inlet 43 and the outlet 23 through the movable passage 75. change the state of communication with

An upstream end 77a of the movable flow path 77 is open at a portion of the first end face 53 that is radially outwardly displaced from the axis L1 (upstream end 71a). A downstream end 77 b of the movable channel 77 is open at the outer peripheral surface 54 . As the valve body 51 rotates, the movable flow path 77 moves (rotates) around the axis L1, thereby moving the inlet 43 and the outlet 21 through the movable flow path 77. change the state of communication with

The valve body 51 configured as described above is rotated by a motor (not shown), manual operation, or the like.
In addition, when the movable channel 71 has the branch channel portions 73 as described above, the number of the branch channel portions 73 may be three or more. Also, the number of movable flow paths 71, 75, 77 in the valve body 51 may be one or three or more. When there is one movable channel 71, 75, 77, it may be branched into a plurality of channels along the way.

<Elastic member 78>
As shown in FIGS. 3, 5 and 9, the elastic member 78 is for urging the shaft portion 61 and the valve body portion 52 to both sides in the direction along the axis L1. The elastic member 78 has an annular shape with a diameter smaller than that of the annular protrusion 55 . The elastic member 78 is formed to have a larger diameter than the virtual circle centered on the axis L1 and passing through the plurality of fitting protrusions 56 . The elastic member 78 is composed of a metal spring. In this embodiment, a wave coil spring is used as the spring. The elastic member 78 is arranged in the accommodation space 68 (see FIG. 5) in a compressed state along the axis L1.

<Inflow side packing 81>
As shown in FIGS. 3 and 4, the inflow side packing 81 is a member corresponding to the packing in the claims, and is mostly made of an elastic material such as rubber. The inflow side packing 81 includes a packing body portion 82 , a first seal portion 84 and a second seal portion 85 . The packing main body portion 82 is a portion that constitutes the skeleton portion of the inflow-side packing 81, and has a plate shape with the direction along the axis L1 as its thickness direction.

The packing main body 82 has the same number of inflow openings 83 as the inflow ports 41 and 43 or more (see FIG. 9). Each inflow opening 83 is formed by a hole penetrating the packing main body 82 in the direction along the axis L1. Two of the inflow openings 83 are formed at locations facing the inflow ports 41 and 43 .

The first seal portion 84 is a surface of the packing main body portion 82 on the side of the first opposing wall surface 34, is formed around each inflow opening 83, and has an annular shape (see FIG. 6). Some of the first seal portions 84 are in contact with the first opposing wall surface 34 around the inlets 41 and 43 (see FIG. 5).

The second seal portion 85 is formed on the first end surface 53 side of the packing main body portion 82 and is formed around each inflow opening 83 and has an annular shape. The second seal portion 85 corresponding to the inlet 41 is in contact with the first end face 53 around the upstream end 71a of the movable flow path 71 regardless of the rotational phase of the valve body 51 . A second seal portion 85 corresponding to the inlet 43 is in contact with the first end face 53 . When the upstream ends 75a and 77a of the movable flow paths 75 and 77 face the inlet 43 as the valve body 51 rotates, the second seal portion 85 has a first end surface around the upstream ends 75a and 77a. 53.

Notch portions 86 are formed at a plurality of locations on the peripheral portion of the packing main body portion 82 . The inflow-side packing 81 is positioned with respect to the cover 31 by engaging the cutouts 86 with the protrusions 35 of the cover 31 (see FIGS. 3, 5, and 6).

<Outflow side packing 91>
As shown in FIG. 8 , the outflow side packing 91 is arranged between the protruding wall portions 16 at a plurality of locations and the outer peripheral surface 54 of the valve body portion 52 . Each outflow side packing 91 has the same configuration as each other. Most of each outflow side packing 91 is made of an elastic material such as rubber.

As shown in FIGS. 3, 4 and 6, each outflow side packing 91 includes a packing main body portion 92, a third sealing portion 94 and a fourth sealing portion 95. As shown in FIG. Each packing main body portion 92 is a portion that constitutes the skeleton portion of the outflow-side packing 91, and has a plate-like shape with the radial direction of the valve main body portion 52 as its own thickness direction. Each packing body 92 has an outflow opening 93 at a location facing each of the outflow ports 21-23.

Each third seal portion 94 is a surface of the packing main body portion 92 on the side of the peripheral wall portion 13 and is annularly formed around the outflow opening 93 . Each third seal portion 94 is in contact with the projecting wall portion 16 around the outflow ports 21-23.

Each fourth seal portion 95 is a surface of the packing main body portion 92 on the valve main body portion 52 side, and is annularly formed around the outflow opening 93 . Each fourth seal portion 95 is in contact with the outer peripheral surface 54 of the valve body portion 52 . When the downstream ends 71b, 75b, 77b of the movable flow paths 71, 75, 77 face the outflow ports 21 to 23 as the valve body 51 rotates, each fourth seal portion 95 is configured to It contacts the outer peripheral surface 54 around 75b and 77b.

Next, the operation of this embodiment configured as described above will be described. In addition, effects caused by the action will also be described.
As shown in FIG. 5, the fluid FL1 flowing through the flow path 101 is sent to the inflow port 41 via the connecting pipe portion 42. As shown in FIG. A fluid FL2 flowing through the flow path 103 is sent to the inlet 43 via the connecting pipe portion 44 .

On the other hand, in the valve body 51, the shaft portion 61 and the valve main body portion 52 are configured by separate parts. However, in the present embodiment, the plurality of fitting protrusions 56 are fitted to the corresponding fitted portions 66, so that the shaft portion 61 can move in the direction along the axis L1 with respect to the valve body portion 52. , and are connected so as to be integrally rotatable. Therefore, when the shaft portion 61 is rotated by a motor (not shown), manual operation, or the like, the rotation is transmitted to the valve body portion 52 via the fitted portion 66 and the fitting projection portion 56 . As the shaft portion 61 rotates, the valve body portion 52 rotates integrally with the coaxial portion 61 . The elastic member 78 arranged in the accommodation space 68 also rotates together with the shaft portion 61 and the valve body portion 52 . At least a part of the movable flow paths 71 , 75 , 77 moves with the rotation of the valve body 51 .

As the valve body 51 rotates, in the movable channel 71, the common channel portion 72 rotates around the axis L1, and both branch channel portions 73 move (turn) around the axis L1. As a result, the state of communication between the inlet 41 and the outlets 22 and 23 via the movable flow path 71 is changed. Although not shown, when the inflow port 41 and the outflow port 23 are communicated through the movable flow path 71, the fluid FL1 flows through the inflow port 41, the movable flow path 71, and the outflow port 23 in order, and then flows through the connecting pipe. It flows out to the channel 115 via the part 26 .

On the other hand, as shown in FIGS. 5, 7 and 8, when the inflow port 41 and the outflow port 22 are communicated through the movable flow path 71, the fluid FL1 flows through the inflow port 41 and the movable flow path 71. and the outflow port 22 in order, and then flowed out to the flow path 113 via the connecting tube portion 25 .

In addition, as the valve element 51 rotates, the entire movable flow path 75 moves (rotates) around the axis L1. This movement changes the state of connection between the movable channel 75 and the inlet 43 , and changes the state of communication between the inlet 43 and the outlet 23 via the movable channel 75 . Although not shown, when the inflow port 43 and the outflow port 23 are communicated through the movable flow path 75, the fluid FL2 flows through the inflow port 43, the movable flow path 75, and the outflow port 23 in order, and then flows through the connecting pipe. It flows out to the channel 115 via the part 26 .

Further, as the valve body 51 rotates, the entire movable flow path 77 moves (turns) around the axis L1. This movement changes the state of connection between the movable channel 77 and the inlet 43 , and changes the state of communication between the inlet 43 and the outlet 21 via the movable channel 77 . As shown in FIGS. 5, 7 and 8, when the inflow port 43 and the outflow port 21 are communicated through the movable flow path 77, the fluid FL2 flows through the inflow port 43, the movable flow path 77 and the outflow port 21. , and then flowed out to the flow path 111 via the connecting tube portion 24 .

In this manner, the state of communication between the inlets 41, 43 and the outlets 21 to 23 via the movable flow paths 71, 75, 77 is changed. The connection state between the plurality of inflow flow paths 101, 103 and the plurality of outflow flow paths 111, 113, 115 is switched.

As shown in FIGS. 5 and 6 , in the rotary valve 10 , the inflow side packing 81 is compressed between the first opposing wall surface 34 and the first end surface 53 . As a result of this compression, the inflow-side packing 81 generates a compression reaction force that pushes back the valve body 52 and the cover 31 to both sides in the direction along the axis L1. Also, the elastic member 78 is compressed between the shaft portion 61 and the valve body portion 52 . Along with this compression, the elastic member 78 generates a compression reaction force that pushes back the shaft portion 61 and the valve body portion 52 to both sides in the direction along the axis L1.

The second end surface 67 of the connecting portion 64 of the shaft portion 61 is pressed against the second opposing wall surface 15 of the bearing portion 18 of the closing portion 14 by the compression reaction force of both the inflow-side packing 81 and the elastic member 78 .

The valve body portion 52 is pressed against the inflow side packing 81 by the compression reaction force of the elastic member 78 . Also, the compression reaction force of the inflow side packing 81 is applied to the first end surface 53 and the first opposing wall surface 34 . Due to the compression reaction force of both the elastic member 78 and the inflow side packing 81, the space between the first opposing wall surface 34 and the first end surface 53 is sealed.

By the way, the elastic member 78 and the inflow-side packing 81 are each elastically deformed to absorb variations in the dimensions of the parts forming the rotary valve 10, especially in the direction along the axis L1. Since the elastic member 78 is added to the inflow side packing 81, the performance of absorbing the dimensional variations of the above-described component parts is higher than in the case of only the inflow side packing 81 (which corresponds to a conventional rotary valve). It is not necessary to increase the compression reaction force by compressing the inflow side packing 81 more in order to absorb the variation.

Therefore, by compressing the inflow-side packing 81 and generating an appropriate compression reaction force, the first opposed wall surface 34 and the first end surface 53 can be kept in contact regardless of variations in the dimensions of the parts constituting the rotary valve 10. can be properly sealed. The valve body 51 is rotated with the first end surface 53 in contact with the second seal portion 85 of the inflow side packing 81 and the second end surface 67 of the shaft portion 61 in contact with the second opposing wall surface 15 of the body 12 . done. However, since the compression reaction force is appropriate as described above, the sliding resistance generated between the first end face 53 and the inflow side packing 81 as the valve body 51 rotates is also reduced to the second end face 67 and the second opposing The sliding resistance generated with the wall surface 15 does not become excessive. As a result, an increase in rotational torque required to rotate the valve body 51 can be suppressed.

According to this embodiment, the following effects are obtained in addition to the above.
- The valve body 51 is rotated while the second end surface 67 is in contact with the second opposing wall surface 15 as described above. Therefore, if the shaft portion 61 having the second end surface 67 and the body 12 having the second opposing wall surface 15 are made of materials with significantly different wear resistance, the member with low wear resistance There is a risk of wear due to the relative rotation in the contact state.

In this regard, in the present embodiment, both the shaft portion 61 and the body 12 are made of a resin material, and the abrasion resistance is not significantly different. Therefore, wear of the shaft portion 61 and the body 12 due to the rotation of the valve body 51 can be suppressed.

The elastic member 78 that contacts the shaft portion 61 and the valve body portion 52 is made of a metal material that is significantly different in wear resistance from the shaft portion 61 and the valve body portion 52 . Therefore, if the elastic member 78 rotates with respect to at least one of the shaft portion 61 and the valve main body portion 52, there is a possibility that the member that rotates relatively in contact with the elastic member 78 will wear out.

In this regard, in this embodiment, the elastic member 78 rotates together with the shaft portion 61 and the valve body portion 52 . The elastic member 78 does not rotate while in contact with either the shaft portion 61 or the valve body portion 52 . Therefore, wear of the shaft portion 61 and the valve body portion 52 can be suppressed.

By suppressing wear as described above, the durability of the rotary valve 10 can be improved.
It should be noted that the above-described embodiment can also be implemented as a modified example in which this is changed as follows. The above embodiments and the following modifications can be combined with each other within a technically consistent range.

- The shaft portion 61 having the second end surface 67 and the body 12 having the second opposing wall surface 15 may be made of a metal material instead of a resin material. The material forming the shaft portion 61 and the material forming the body 12 may be the same type of metal material, or may be different types of metal material. Also in this case, the wear resistance of the shaft portion 61 and the body 12 does not differ greatly. An effect of suppressing wear of the shaft portion 61 and the body 12 due to the rotation of the valve body 51 is obtained.

- There are no particular restrictions on the materials used to form the valve body portion 52 of the valve body 51 and the cover 31 of the housing 11 . This is because there is no relative rotation in the contact state, and there is no risk of wear due to the same relative rotation.

- The inflow side packing 81 may have a shape that is difficult to elastically deform. For example, this corresponds to the inflow side packing 81 in which the amount of protrusion of the first seal portion 84 from the packing main body portion 82 is smaller than that in the above embodiment. In this case, the amount of absorption of variations in the dimensions of the parts forming the rotary valve 10 is smaller than in the above embodiment. However, when the dimensional variation is absorbed only by the elastic member 78, the rotational torque required to rotate the valve body 51 can be suppressed more than when the dimensional variation is absorbed only by the inflow side packing 81. There is

- As the elastic member 78, a spring of a different type from the wave coil spring, for example, a general coil spring may be used.
- As the elastic member 78, a member having a diameter smaller than that of the above-described embodiment, for example, a member having a diameter approximately equal to that of the shaft body portion 62 may be used.

- As the elastic member 78, a ring-shaped member different from the ring-shaped ring may be used.
The elastic member 78 may be a member having a form different from that of a spring, provided that it is a member capable of urging the shaft portion 61 and the valve body portion 52 to both sides in the direction along the axis L1. For example, an O-ring may be used as the elastic member 78 .

Also, the elastic member 78 may be made of a material different from a metal material, such as a resin material (including rubber).
- The number of fitting protrusions 56 on the valve body 52 and the number of fitted parts 66 on the shaft 61 may be changed to numbers different from those in the above embodiment.

Contrary to the above embodiment, the shaft portion 61 may be provided with the fitting protrusion 56 and the valve body portion 52 may be provided with the fitted portion 66 . By fitting the fitting protrusion 56 to the fitted portion 66, the shaft portion 61 is connected to the valve main body portion 52 so as to be movable in the direction along the axis L1 and to rotate integrally therewith. good.

DESCRIPTION OF SYMBOLS 10... Rotary valve 11... Housing 15... Second opposing wall surface 21, 22, 23... Outflow port 34... First opposing wall surface 36... Accommodating portion 41, 43... Inflow port 51... Valve body 52... Valve main body 53... First End face 61 Shaft portion 67 Second end face 71, 75, 77 Movable flow path 78 Elastic member 81 Inflow side packing (packing)
FL1, FL2... Fluid L1... Axis

Claims (2)

a housing having an accommodating portion and having a fluid inlet and an outlet facing the accommodating portion; and a movable flow path accommodated in the accommodating portion and communicating the inlet and the outlet. and a shaft portion that rotatably supports the valve body portion on the housing. Rotation of the valve body portion about the shaft portion causes the valve body to move through the movable flow path. a valve body that switches the outlet communicating with the inlet,
The housing has a first opposing wall surface and a second opposing wall surface that face each other across the accommodating portion from both sides in a direction along the axis of the shaft portion, and the valve body faces the first opposing wall surface. and a second end face in contact with the second opposing wall surface,
A rotary valve in which the shaft portion is positioned closer to the second opposing wall surface than the valve body portion, and a packing is disposed between the first opposing wall surface and the first end surface,
The shaft portion is configured by a component different from the valve body portion, the valve body portion has the first end surface, the shaft portion has the second end surface, and the shaft portion is the valve body portion. It is connected to the main body part so as to be movable in the direction along the axis and to be rotatable together, and between the shaft part and the valve body part, the shaft part and the valve body part are arranged in the direction along the axis line. A rotary valve in which an elastic member that biases to both sides is arranged. 2. The rotary valve according to claim 1, wherein the shaft portion and the member of the housing having the second facing wall surface are made of either one of a resin material and a metal material.

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