JP7235328B2 - valve - Google Patents

Description

The present invention relates to a valve for switching fluid flow paths.

2. Description of the Related Art As a rotary valve that switches fluid flow paths, one that includes a housing and a valve body is known. The housing includes an annular peripheral wall portion having an accommodating portion, and a planar portion positioned at one open end of the peripheral wall portion and facing the accommodating portion. The planar portion is formed with an inlet for fluid to the storage portion. In addition, outlets for the fluid inside the accommodating portion are formed at a plurality of places in the circumferential direction of the peripheral wall portion. The valve body includes a columnar valve main body portion arranged in the accommodating portion, and is rotatably supported by the housing via a shaft. 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, the outflow port communicating with the inflow port via the movable flow path is switched, and the flow path of the fluid is switched.

In the above rotary valve, in order to allow the fluid to flow out only from the outlet communicating with the inlet via the movable flow path, for example, as described in Japanese Patent Laid-Open No. 2002-100000, the valve main body and the outlets are separated from each other. An outflow side packing is arranged therebetween.

By the way, the above-mentioned rotary valve is usually intended for a single fluid and causes the fluid that has flowed in from one inlet to flow out from any of a plurality of outlets. There is an increasing need to switch the flow path of the fluid. Therefore, a plurality of inlets are formed in the flat portion. At least part of the movable flow path moves with the rotation of the valve body, and the flow path is switched by changing the state of communication between the inlet and the outlet via the movable flow path.

In this case, the inflow side packing is arranged between the flat portion and the valve body portion in order to prevent the fluids from mixing with each other while the flow paths are switched. The packing main body, which constitutes the skeleton of the inflow-side packing, is provided with through-holes that penetrate in the thickness direction of the packing main body, the number of which is equal to or greater than the number of the inlets. The packing main body is arranged such that one of the through holes faces all the inlets. An annular first seal portion is provided around each through-hole on the plane portion side surface in the thickness direction of the packing main body portion. An annular second seal portion is provided around each through-hole on the surface of the packing main body on the side of the valve main body in the thickness direction. Each first seal portion is pressed against the flat portion, and each second seal portion is pressed against the valve main body. Since the conventional rotary valve described above is premised on switching a single fluid flow path, the inflow side packing as described above is unnecessary.

JP-A-11-125343

As described above, in the rotary valve in which the inflow-side packing is arranged between the flat portion of the housing and the valve body, the valve body is displaced in the direction along the surface of the packing body (the direction perpendicular to the thickness direction). The dimensions, and thus the dimensions of the rotary valve in the same direction, are greatly affected by the packing body. Therefore, in order to reduce the size of the valve body and the rotary valve, it is desired to reduce the size of the inflow side packing in the direction along the surface of the packing body.

Such miniaturization is not limited to the packing on the inflow side, but only on the condition that the packing body is disposed between the flat portion and the valve body, and the packing body is a packing having a plurality of through holes. Side packings are also desired. Furthermore, not only the rotary valve, but also other types, such as the packing in the type of valve in which the flow path is switched by sliding the valve main body along the flat surface in the direction along the surface, the same as the above can be applied. Miniaturization is desired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve in which the size of the packing can be reduced in the direction along the surface of the packing main body.

A valve for solving the above problem is arranged in the middle of a plurality of fluid flow paths, and includes a storage portion and a flat portion facing the storage portion, and the flat portion includes the fluid and a valve body portion having a movable flow path and movably stored in the housing portion, wherein the movable flow path is the a valve body that is open at an end surface facing the flat portion; and a packing that is disposed between the flat portion and the valve body, and whose frame portion is composed of the packing main body, the valve main body In the valve , the connecting state between the movable flow path and the opening is changed according to the movement of the packing body, wherein the packing body has through-holes penetrating in the thickness direction of the packing body for the number of the openings. Any of the through-holes are arranged to face all the openings, and the surface of the packing main body on the side of the plane portion has , an annular first seal portion is formed in contact with the flat surface portion, and an annular seal portion in contact with the valve body portion is formed around each through-hole on the surface of the packing body portion on the side of the valve body portion. A second seal portion is formed , and a portion of each first seal portion in the circumferential direction overlaps with a portion of the adjacent first seal portion in the circumferential direction, and each second seal portion in the circumferential direction A portion overlaps with a portion of the adjacent second seal portion in the circumferential direction.

According to the above configuration , the packing is located between the flat portion and the valve main body when assembled in the valve. In this state, the first seal portion around the through hole contacts the flat portion. At least a portion of the through-hole faces the opening, and the first sealing portion around the through-hole contacts around the opening in the flat portion. Therefore, between the packing main body portion and the flat portion, the movement of the fluid between the inner region and the outer region of each first seal portion via the first seal portion is regulated. Also, the second seal portion around the through-hole contacts the end surface of the valve body portion facing the flat portion. Therefore, between the valve main body portion and the packing main body portion, the flow of fluid between the inner region and the outer region of the second seal portion via the second seal portion is restricted. Therefore, these restrictions suppress the phenomenon that the fluid is mixed between the valve main body portion and the flat portion.

By the way, in the above-mentioned valve, the dimension of the valve body in the direction along the surface of the packing body, and thus the dimension of the valve in the same direction, is greatly affected by the packing body.
In this regard, in the packing having the above configuration, a portion of the circumferential direction of each first seal portion and a portion of the circumferential direction of the adjacent first seal portion overlap (lap), and each second seal portion overlaps (laps). A portion of the seal portion in the circumferential direction and a portion of the adjacent second seal portion in the circumferential direction overlap (lap). Therefore, the distance between the adjacent through-holes becomes shorter than when the adjacent first seal portions are separated from each other and the adjacent second seal portions are separated from each other. As a result, the dimension of the packing in the direction along the surface of the packing body is reduced. As a result, the distance between adjacent openings is shortened, making it possible to reduce the size of the valve in the above direction.

In the above valve , the adjacent first seal portions overlap each other in the overlapping portion, and the overlapping portion is open on the side of the side contacting the flat portion so as to extend in the circumferential direction of the overlapping portion. and a bottom portion of the slit is preferably located at a portion of the first seal portion that is further away from the packing main body portion toward the flat portion side.

Here, when a portion of the first seal portion in the circumferential direction and a portion of the adjacent first seal portion in the circumferential direction overlap, the overlapping portion has a radial dimension (width ) is greater than the width of the non-overlapping portion in the same direction. Along with this, in the overlapping portion, the dimension (compression margin) that allows elastic deformation in the thickness direction of the packing main body due to compression becomes shorter than in the non-overlapping portion. In addition, in the overlapping portion, the surface pressure generated by pressure contact against the flat portion increases compared to the non-overlapping portion. This is because the overlapping portion has a larger cross-sectional area than the non-overlapping portion.

In this respect, as in the above configuration, the overlapping portion is provided with a slit extending in the circumferential direction of the same overlapping portion, so that the compression margin of the overlapping portion is longer than in the case where the slit is not provided. In addition, the cross-sectional area is reduced due to the slits, and variations in surface pressure generated by pressure contact between the overlapping portion and the non-overlapping portion against the flat portion are reduced.

In the above-described valve , the packing main body portion is in a state in which the first seal portion is seated on the flat portion by contacting a restricting portion provided on the flat portion during assembly to the valve. It is preferable that a regulated portion is provided for regulating a direction in which the packing main body portion approaches the flat portion in a direction orthogonal to the flat portion.

Here , when assembling the packing to the valve, the following phenomenon may occur if the packing main body approaches in a direction inclined with respect to the flat portion while the first seal portion is seated on the flat portion. That is, of the overlapping portion, both side portions in the width direction of the slit are not elastically deformed into a desired shape such that the interval between the side portions widens as the distance between the two side portions approaches the flat portion. For example, both side portions are elastically deformed so as to fall in the same direction while contacting each other without spreading.

In this respect, according to the above configuration , when the packing is assembled to the valve, the portion to be regulated provided on the packing main body portion is provided on the flat portion during the process in which the packing main body portion approaches the flat portion. contact with the regulating part. Due to this contact, the direction in which the packing main body approaches the flat portion in a state in which the first seal portion is seated on the flat portion is restricted to the direction orthogonal to the flat portion. As a result, the overlapping portion seated on the planar portion is compressed in a direction orthogonal to the planar portion. Of the overlapping portion, both side portions in the width direction of the slit are elastically deformed into a desired shape such that the interval between the both side portions widens as it approaches the plane portion.

According to the above valve , the size of the packing can be reduced in the direction along the surface of the packing body.

1 is a perspective view of a rotary valve in one embodiment; FIG. 1 is a plan view of a rotary valve in one embodiment; FIG. 3A is an exploded perspective view of a rotary valve according to an embodiment, and FIG. 3B is a perspective view showing an enlarged part of FIG. 3A; FIG. The perspective view which looked at the valve body in one Embodiment from the valve main-body part side. The perspective view which looked at the inflow side packing in one Embodiment from the 1st seal part side. The perspective view which looked at the inflow side packing in one Embodiment from the 2nd seal part side. 7-7 line sectional drawing of FIG. 2. FIG. 8-8 line sectional view of FIG. FIG. 8 is an enlarged cross-sectional view of part X in FIG. 7 ; FIG. 10 is a view corresponding to FIG. 9 and is a partial cross-sectional view when the overlapping portion is elastically deformed into a desired shape; FIG. 10 is a view corresponding to FIG. 9 and is a partial cross-sectional view when the overlapping portion is elastically deformed into a shape different from the intended shape; FIG. 4 is an exploded perspective view showing the correspondence relationship between the regulating portion on the flat portion of the cover and the regulated portion on the inflow-side packing. (a) is a cross-sectional view taken along line 13a-13a of FIG. 2, and (b) is a partial cross-sectional view showing an enlarged part of FIG. 13(a). FIG. 4 is a partial cross-sectional view of the inflow-side packing in one embodiment; FIG. 10 is a view showing a comparative example, and is a partial cross-sectional view of the inflow side packing when no slit is formed in the overlapping portion of the first seal portion. FIG. 6 is a view corresponding to FIG. 5 , and is a perspective view of an inflow-side packing of a comparative example in which a first seal portion is formed independently from an adjacent first seal portion;

An embodiment of the valve will be described below with reference to the drawings.
The valve packing of this embodiment is incorporated in a rotary valve and used. This rotary valve is one form of a valve that is provided in the middle of a plurality of fluid flow paths and switches the connection state of the flow paths.

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. 1 and 3, the rotary valve 10 includes a housing 11, a valve body 51, an inflow side packing 71 and an outflow side packing 95. As shown in FIG. Among these members, the inflow side packing 71 corresponds to the packing in the claims. Next, each member will be described.

<Housing 11>
The housing 11 has a body 12 and a cover 31 . The body 12 has a substantially cylindrical peripheral wall portion 13 extending along the axis L<b>1 and having an internal space as a housing portion 41 . One end of the peripheral wall portion 13 in the direction along the axis L1 is closed by the closing portion 14, and the other end is open (see FIG. 7).

As shown in FIGS. 2, 7 and 8, the peripheral wall portion 13 is formed with a plurality of projecting wall portions 15 projecting outward in the radial direction. An annular protrusion 16 is formed at the end of the peripheral wall portion 13 opposite to the closing portion 14 in the direction along the axis L1. As shown in FIGS. 3 and 7, a bearing hole 17 is formed in the central portion of the closing portion 14 .

The cover 31 is arranged on the opposite side of the closing portion 14 in the direction along the axis L1 with the peripheral wall portion 13 interposed therebetween. An annular recess 32 that is open on the surface on the body 12 side is formed in the outer peripheral portion of the cover 31 . A mounting portion 33 for mounting the inflow side packing 71 is formed in a portion of the cover 31 surrounded by the annular recess 32 . A bottom portion of the mounting portion 33 is configured by a flat portion 34 . A surface of the flat portion 34 on the side of the body 12 is formed by a plane perpendicular to the axis L1.

The annular protrusion 16 of the body 12 is fitted into the annular recess 32 of the cover 31 . An O-ring 35 is attached to the outer peripheral surface of the annular projection 16 to seal between the annular projection 16 and the annular recess 32 by coming into contact with the wall surface of the annular recess 32 .

Connecting projections 18 projecting radially outward are formed at a plurality of locations on the outer peripheral portion of the body 12 . Further, connecting protrusions 36 projecting radially outward are formed at a plurality of positions corresponding to the connecting protrusions 18 on the outer peripheral portion of the cover 31 . The body 12 and the cover 31 are connected by inserting a bolt 37 through each of the connecting projections 18 and 36 corresponding to each other and tightening a nut 38 on each bolt 37 .

The flat portion 34 of the cover 31 faces the housing portion 41 . An inflow port 42 for the fluid FL1 is formed as a part of an opening through which the fluid passes in the flat portion 34 where the axis L1 passes. A connecting pipe portion 43 protrudes from the peripheral portion of the inlet 42 of the cover 31 toward the side away from the housing portion 41 along the axis L1. A pipe 102 having a flow path 101 for the fluid FL1 is connected to the connecting pipe portion 43 . Further, an inlet 44 for the fluid FL2 is formed as a part of the opening through which the fluid passes, at a portion of the flat portion 34 slightly shifted outward in the radial direction from the inlet 42 . A connecting pipe portion 45 protrudes from the peripheral portion of the inlet 44 in the cover 31 . A pipe 104 having a flow path 103 for the fluid FL2 is connected to the connecting pipe portion 45 .

As shown in FIG. 8, each protruding wall portion 15 is formed with one of outlets 21 to 23 . These outflow ports 21 to 23 are open facing the accommodating portion 41 . Connection pipe portions 24 to 26 protrude outward in the radial direction of the body 12 from peripheral portions of the outflow ports 21 to 23 of the projecting wall portion 15 . 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. 7 and 8, the valve body 51 includes a valve body portion 52 and a shaft portion 56. As shown in FIGS. 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. Both end surfaces 53 and 54 of the valve body 52 in the direction along the axis L1 are formed by planes perpendicular to the axis L1. An outer peripheral surface 55 of the valve body portion 52 is formed of a cylindrical surface centered on the axis L1.

The shaft portion 56 is provided at the center of the end surface 53 of the valve body portion 52 . The shaft portion 56 protrudes away from the cover 31 . The shaft portion 56 has the axis L1 of the peripheral wall portion 13 as its own axis. The valve body portion 52 is accommodated in the accommodation portion 41 and the shaft portion 56 is inserted through the bearing hole 17 . An end surface 54 of the valve body 52 faces the flat surface 34 of the cover 31 , and an outer peripheral surface 55 of the valve body 52 faces the inner peripheral surface of the peripheral wall 13 . The shaft portion 56 is rotatably supported with respect to the body 12 in the bearing hole 17 . An O-ring 57 is interposed between the shaft portion 56 and the closing portion 14 .

As shown in FIGS. 4, 7 and 8, the valve body 52 is formed with one movable flow path 61 through which the fluid FL1 flows and two movable flow paths 65 and 67 through which the fluid FL2 flows. .
The movable channel 61 is composed of one common channel portion 62 forming an upstream portion in the flow direction of the fluid FL1, and two branch channel portions 63 respectively forming downstream portions in the same flow direction. An upstream end 61 a of the movable channel 61 in the flow direction is open at the center of the end face 54 and faces the inlet 42 . A downstream end 61 b of the movable channel 61 in the flow direction is open at the outer peripheral surface 55 . As the valve body 51 rotates, both of the branched flow path portions 63 move (rotate), and the movable flow path 61 changes the state of communication between the inlet 42 and the outlets 21 and 22 via the movable flow path 61 . to change

An upstream end 65a of the movable flow path 65 in the flow direction is open at a portion of the end face 54 that is deviated radially outward from the axis L1 (upstream end 61a). A downstream end 65 b of the movable channel 65 in the flow direction is open at the outer peripheral surface 55 . As the valve element 51 rotates, the entire movable flow path 65 moves (rotates) around the axis L1. 22 is changed.

The upstream end 67a of the movable flow path 67 in the flow direction is open at a portion of the end surface 54 of the valve body 52 that is radially outwardly deviated from the axis L1 (upstream end 61a). A downstream end 67 b of the movable channel 67 in the flow direction is open at the outer peripheral surface 55 . As the valve element 51 rotates, the entire movable flow path 67 moves (rotates) around the axis L1, so that the inlet port 44 and the outlet port 44 through the movable flow path 67 move (rotate). 23 is changed.

The various communication states described above are changed on the condition that at least the connection states between the movable flow paths 61, 65, 67 and the inlets 42, 44 are changed.
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 61 has the branch channel portions 63 as described above, the number of the branch channel portions 63 may be three or more. Also, the number of movable flow paths 61, 65, 67 in the valve body 51 may be one or three or more. When there is one movable channel 61, 65, 67, it may be branched into a plurality of channels along the way.

<Inflow side packing 71>
As shown in FIGS. 5, 6 and 9, the inflow side packing 71 includes a packing main body portion 72, first seal portions 74a, 74b and 74c, second seal portions 81a, 81b and 81c, and a seat 86. . The inflow side packing 71 is arranged between the flat portion 34 and the end face 54 of the valve body portion 52 and engaged with the mounting portion 33 of the cover 31 . The packing body portion 72, the first seal portions 74a, 74b, 74c, and the second seal portions 81a, 81b, 81c are integrally formed of an elastic material such as rubber. On the other hand, the sheet 86 is made of fluororesin and adhered to the surface of the packing main body 72 and the second seal portions 81a, 81b, 81c on the valve main body 52 side. The seat 86 reduces the friction between the inflow side packing 71 and the end surface 54 of the valve body 52 and reduces the load required to rotate the valve body 51 .

The packing main body portion 72 is a portion that constitutes the skeleton portion of the inflow side packing 71 . The packing main body portion 72 has a plate-like shape with a substantially uniform dimension (thickness) in the direction along the axis L1 as its thickness direction.

The packing main body portion 72 has through-holes penetrating in its thickness direction, the number of which is equal to or greater than the number of the inlets 42 and 44 . In this embodiment, the packing main body 72 has three through-holes 73a, 73b, 73c, which are one more than the inlets 42, 44, respectively. Each through hole 73a, 73b, 73c is a circular hole having a slightly larger diameter than the inlets 42, 44. As shown in FIG. The through-hole 73 a is formed in a portion of the packing main body 72 facing the inlet 42 . The through hole 73b is formed in a portion of the packing main body 72 facing the inlet 44 . Since the inlets 42 and 44 are close to each other as described above, the through holes 73a and 73b are also close to each other. Therefore, when the inflow side packing 71 is assembled to the rotary valve 10, all the inflow ports 42 and 44 are opposed to one of the through holes 73a, 73b and 73c.

The remaining one through-hole 73c is formed in a portion of the packing main body 72 that is not opposed to any of the inlets 42 and 44 and that is close to the adjacent through-hole 73a. In this embodiment, the through-hole 73c is arranged at a location facing the through-hole 73b with a portion of the through-hole 73a interposed therebetween. The arrangement direction of the through holes 73a and 73c crosses the arrangement direction of the through holes 73a and 73b.

As shown in FIGS. 5, 9, and 14, the first seal portion 74a is a surface of the packing main body portion 72 on the plane portion 34 side, is formed around the through hole 73a, and has an annular shape. ing. The first seal portion 74 a is in contact with the flat portion 34 around the inlet 42 . The first seal portion 74b is a surface of the packing main body portion 72 on the plane portion 34 side, is formed around the through hole 73b, and has an annular shape. The first seal portion 74 b contacts the flat portion 34 around the inlet 44 . The first seal portion 74c is a surface of the packing main body portion 72 on the plane portion 34 side, is formed around the through hole 73c, and has an annular shape. The first seal portion 74c is in contact with the plane portion 34 at a location different from the inlets 42 and 44. As shown in FIG.

A portion of the first seal portion 74a in the circumferential direction overlaps with a portion of the adjacent first seal portion 74b in the circumferential direction. Both the first seal portions 74 a and 74 b are connected to each other at the overlapping portion 75 .

In the first seal portions 74a and 74b, the inner peripheral surfaces 76 of the first seal portions 74a and 74b extend parallel to or nearly parallel to the axis L1 at locations (non-overlapping portions) different from the overlapping portion 75. slanted at an angle. The outer peripheral surfaces 77 of the first seal portions 74a and 74b are tapered surfaces greatly inclined with respect to the axis L1 so as to come closer to the inner peripheral surface 76 as the distance from the packing main body portion 72 increases. Therefore, the dimension (width) of the non-overlapping portion in the radial direction of the first seal portions 74a and 74b becomes smaller as the distance from the packing main body portion 72 toward the plane portion 34 side increases.

A single slit 78 is formed in the overlapping portion 75 so as to extend in the circumferential direction, or in other words, the common tangential direction of the first seal portions 74a and 74b. The slit 78 is open on the side of the overlapping portion 75 that contacts the flat portion 34 . More specifically, the slit 78 is open at the central portion in the radial direction of the first seal portions 74a and 74b among the surfaces. Assuming that the width of the slit 78 is the dimension of the slit 78 in the radial direction, the width is greatest on the side contacting the flat portion 34 and decreases toward the packing body portion 72 .

The slit 78 is formed over the entire circumferential length of the overlapping portion 75 . The slit 78 is open at both ends in the circumferential direction of the overlapping portion 75 .
By forming the slit 78 in the overlapped portion 75, a flexible portion 75a is formed on the first seal portion 74a side of the overlapped portion 75 with respect to the slit 78, and a flexible portion 75a is formed on the first seal portion 74b side of the overlapped portion 75. 75b are formed.

As shown in FIG. 5, another portion of the first seal portion 74a in the circumferential direction (a portion different from the overlapping portion 75) overlaps with a portion of the adjacent first seal portion 74c in the circumferential direction. . Both the first seal portions 74 a and 74 c are connected to each other at the overlapping portion 79 .

A portion (non-overlapping portion) of the first sealing portion 74c that is different from the overlapping portion 79 has a cross-sectional shape similar to that of the non-overlapping portions of the first sealing portions 74a and 74b, though not shown.

The overlapping portion 79 is formed with a slit 80 extending in the circumferential direction, or in other words, the common tangential direction of the first seal portions 74a and 74c. This slit 80 has the same shape as the slit 78 in the overlapping portion 75 . However, the direction in which the slit 80 extends is different from the direction in which the slit 78 extends.

By forming the slit 80 in the overlapping portion 79 , a pair of flexible portions 79 a and 79 b are formed on both sides of the slit 80 in the width direction of the overlapping portion 79 .
<Second seal portions 81a, 81b, 81c>
As shown in FIGS. 6, 9 and 14, the second seal portion 81a corresponding to the inflow port 42 is formed around the through hole 73a on the surface of the packing body portion 72 on the valve body portion 52 side. It has a toric shape. The second seal portion 81 a is in contact with the end surface 54 via the seat 86 around the upstream end 61 a of the movable flow path 61 regardless of the rotational phase of the valve body 51 .

The second seal portion 81b corresponding to the inflow port 44 is the surface of the packing body portion 72 on the valve body portion 52 side, is formed around the through hole 73b, and has an annular shape. The second seal portion 81b is in contact with the end face 54 via the sheet 86. Especially when the upstream ends 65a and 67a of the movable flow paths 65 and 67 face the inlet 44, the upstream end 65a , 67a in contact with the end surface 54 via the sheet 86. As shown in FIG.

The second seal portion 81c, which does not correspond to any of the inlets 42, 44, is formed on the surface of the packing body portion 72 on the valve body portion 52 side, is formed around the through hole 73c, and has an annular shape. there is The second seal portion 81c is in contact with the end surface 54 via the sheet 86. Especially when the downstream end 67b of the movable flow path 67 faces the outlet 21 as shown in FIG. It contacts the end surface 54 via the sheet 86 around the upstream end 67a.

As shown in FIGS. 6, 9 and 14, a portion of the second seal portion 81a in the circumferential direction overlaps with a portion of the adjacent second seal portion 81b in the circumferential direction. Both the second seal portions 81a and 81b are connected to each other at the overlapping portion 82. As shown in FIG. Similarly, another portion of the second seal portion 81a in the circumferential direction (a portion different from the overlapping portion 82) overlaps with a portion of the adjacent second seal portion 81c in the circumferential direction. Both the second seal portions 81 a and 81 c are connected to each other at the overlapping portion 83 .

Note that, unlike the overlapping portions 75 and 79 of the first seal portions 74a, 74b and 74c, no slits are formed in any of the overlapping portions 82 and 83.
Both the overlapping portions 82 and 83 and the portions (non-overlapping portions) of the second sealing portions 81a, 81b and 81c different from the overlapping portions 82 and 83 have inner and outer peripheral surfaces 84 and 84 of the second sealing portions 81a, 81b and 81c. 85 are inclined with respect to the axis line L1 so that they gradually approach each other as they move away from the packing main body 72 . Therefore, the dimension (width) of the overlapping portions 82, 83 and the non-overlapping portions in the radial direction of the second seal portions 81a, 81b, 81c gradually decreases as the distance from the packing main body portion 72 increases.

In addition, the dimension (width) of the overlapping portions 82 and 83 in the radial direction of the second seal portions 81a, 81b and 81c is the smallest at the central portion of the overlapping portions 82 and 83 in the circumferential direction. The width of the overlapping portions 82 and 83 increases with increasing distance from the central portion of the overlapping portions 82 and 83 in the circumferential direction, and becomes maximum at the ends in the circumferential direction. The central portions in the circumferential direction of the overlapping portions 82 and 83 have substantially the same cross-sectional shape as the non-overlapping portions.

By the way, as shown in FIGS. 5, 12 and 13 (a) and (b), the packing main body 72 has a flat surface portion 34 provided for mounting the inflow side packing 71 to the rotary valve 10. Regulated portions 91 , 92 , 93 that contact the regulating portions 87 , 88 , 89 are provided. The regulated portions 91 to 93 have the function of positioning the inflow side packing 71 with respect to the cover 31 by contact with the regulating portions 87, 88 and 89 during the assembly. In addition, the regulated portions 91 to 93 allow the direction of approach of the packing main body portion 72 to the plane portion 34 in a state in which the first seal portions 74a, 74b, and 74c are seated on the plane portion 34 by the contact. It also has the function of regulating in the direction perpendicular to 34 . The regulated portions 91 to 93 are provided at a plurality of locations in the packing main body portion 72, different from the first seal portions 74a, 74b, and 74c, three locations in the present embodiment. Each of the regulated portions 91 to 93 is formed of a hole that is open on the plane portion 34 side of the packing main body 72 and penetrates through the packing main body 72 in the thickness direction.

The restricting portions 87 to 89 are provided at a plurality of locations (three locations) on the planar portion 34 so as to face the restricted portions 91 to 93 . Each of the regulating portions 87 to 89 is composed of a projecting portion projecting from the flat portion 34 toward the valve body portion 52 side. Each of the regulating portions 87-89 is formed with a thickness that allows it to be inserted into the corresponding regulated portions 91-93.

When the restricted portions 91 to 93 come into contact with the restricted portions 87 to 89 entering the restricted portions 91 to 93, the approach direction is restricted.
<Outflow side packing 95>
As shown in FIGS. 3A, 3B, and 8, the outflow side packing 95 is arranged between each of the protruding wall portions 15 at three locations and the outer peripheral surface 55 of the valve body portion 52. As shown in FIGS. Each outflow side packing 95 has the same configuration as each other.

Each outflow side packing 95 includes a packing body portion 96 , a third seal portion 98 , a fourth seal portion 99 and a seat 100 . Each packing main body portion 96 is a portion that constitutes the skeleton portion of the outflow side packing 95, 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 96 has a through hole 97 at a location facing each of the outlets 21-23. Each through hole 97 is a circular hole having a slightly larger diameter than the outflow ports 21-23.

Each third seal portion 98 is a surface of the packing main body portion 96 on the side of the peripheral wall portion 13 and is annularly formed around the through hole 97 . Each third seal portion 98 is in contact with the projecting wall portion 15 around the outflow ports 21-23.

Further, each fourth seal portion 99 is a surface of the packing body portion 96 on the valve body portion 52 side, and is formed annularly around the through hole 97 . Each fourth seal portion 99 is in contact with the outer peripheral surface 55 of the valve body portion 52, and particularly the downstream ends 61b, 65b, 67b of the movable flow paths 61, 65, 67 face the outflow ports 21-23. In this case, it contacts the outer peripheral surface 55 around its downstream ends 61b, 65b, 67b.

The sheet 100 is made of fluororesin similarly to the sheet 86 of the inflow side packing 71, and is attached to the surfaces of the packing main body 96 and the fourth seal portion 99 on the valve main body 52 side. The sheet 100 reduces the friction between the outflow side packing 95 and the outer peripheral surface 55 of the valve body 52 and reduces the load required to rotate the valve body 51 .

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. 7, the fluid FL1 flowing through the flow path 101 is sent to the inflow port 42 via the connecting pipe portion 43. As shown in FIG. A fluid FL2 flowing through the flow path 103 is sent to the inlet 44 via the connecting pipe portion 45 .

On the other hand, when the valve body 51 is rotated by a motor (not shown), manual operation, or the like, at least part of the movable flow paths 61, 65, 67 move along with the rotation.
As shown in FIGS. 4, 7 and 8, as the valve body 51 rotates, in the movable flow path 61, the common flow path portion 62 rotates about the axis L1, and both branch flow path portions 63 rotate. It moves (rotates) around the axis L1. As a result, the state of connection between the movable channel 61 and the inlet 42 is changed, and the state of communication between the inlet 42 and the outlets 21 and 22 via the movable channel 61 is changed. For example, although not shown, when the inflow port 42 and the outflow port 21 are communicated through the movable flow path 61, the fluid FL1 flows through the inflow port 42, the movable flow path 61, and the outflow port 21 in order, and then It flows out to the flow path 111 via the connecting pipe portion 24 .

On the other hand, when the inflow port 42 and the outflow port 22 are communicated through the movable flow path 61, the fluid FL1 flows through the inflow port 42, the movable flow path 61, and the outflow port 22 in order, and then flows through the connecting tube portion. 25 into flow path 113 (see FIG. 8).

In addition, as the valve element 51 rotates, the entire movable flow path 65 moves (rotates) around the axis L1. This movement changes the state of connection between the movable channel 65 and the inlet 44 , and changes the state of communication between the inlet 44 and the outlet 22 via the movable channel 65 . For example, although not shown, when the inflow port 44 and the outflow port 22 are communicated through the movable flow path 65, the fluid FL2 flows through the inflow port 44, the movable flow path 65, and the outflow port 22 in order, and then It flows out to the flow path 113 via the connecting pipe portion 25 .

Further, as the valve body 51 rotates, the entire movable flow path 67 moves (rotates) around the axis L1. This movement changes the state of connection between the movable channel 67 and the inlet 44 , and changes the state of communication between the inlet 44 and the outlet 23 via the movable channel 67 . For example, although not shown, when the inflow port 44 and the outflow port 23 are communicated through the movable flow path 67, the fluid FL2 flows through the inflow port 44, the movable flow path 67, and the outflow port 23 in order, and then It flows out to the flow path 115 via the connecting pipe portion 26 .

In this way, the connecting state between the movable flow paths 61, 65, 67 and the inlets 42, 44 is changed, and the inlets 42, 44 and the outlets 21 to 21 through the movable flow paths 61, 65, 67 are changed. 23 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.

Here, as shown in FIGS. 5, 7 and 10, the first seal portions 74a and 74b of the inflow side packing 71 are pressed against the periphery of the inflow ports 42 and 44 in the flat portion 34. As shown in FIGS. Therefore, between the packing main body portion 72 and the flat portion 34, the fluids FL1 and FL2 between the inner and outer regions of the first seal portions 74a and 74b move the first seal portions 74a and 74b. Traveling through it is restricted.

6, 7 and 10, when the connection state between the flow paths 101, 103 and the flow paths 111, 113, 115 is switched, the second seal portions 81a, 81b of the inflow side packing 71 , 81c press against the periphery of the upstream ends 61a, 65a, 67a of the movable flow paths 61, 65, 67 in the end face 54 of the valve body 52. As shown in FIG. Therefore, between the valve main body portion 52 and the packing main body portion 72, the fluids FL1 and FL2 flow between the inner and outer regions of the second seal portions 81a, 81b and 81c. Commuting via 81b and 81c is restricted.

Therefore, when the connection state between the flow paths 101, 103 and the flow paths 111, 113, 115 is switched, the phenomenon that the fluids FL1, FL2 are mixed between the valve body portion 52 and the flat portion 34 is suppressed by the regulation. be done.

As described above, according to the present embodiment, although there is only one rotary valve 10, by rotating the valve body 51 to change the state of communication between the inlets 42, 44 and the outlets 21-23, , FL2, the connection state between the flow paths 101, 103 of the inflow system and the flow paths 111, 113, 115 of the outflow system can be switched. Further, in the state after switching, it is possible to suppress mixing of the fluids FL1 and FL2 regardless of the rotation phase of the valve body 51 .

As shown in FIG. 8, the first seal portion 74c and the second seal portion 81c provided around the through hole 73c facing neither of the inlets 42, 44 are When the upstream end 67a of the movable channel 67 does not face any of the inlets 42, 44 and the downstream end 67b faces the outlet 21, it is used to seal the upstream end 67a.

That is, when the fluid FL1 that has once flowed out to the connecting pipe portion 24 flows backward from the outflow port 21 into the movable flow path 67, the fluid FL2 in the movable flow path 67 flows from the upstream end 67a into the gap between the valve main body 52 and the housing 11. get into This fluid FL2 may enter into the unsealed movable flow path 61 with the downstream end 61b not facing any of the outlets 21 to 23 and be mixed with the fluid FL1 flowing in from the inlet 42. .

However, in the present embodiment, the fluid FL2 that attempts to flow back through the movable flow path 67 is stopped by the first seal portion 74c and the second seal portion 81c that surround the upstream end 67a. Therefore, it is possible to suppress a phenomenon in which the fluid FL2 enters the movable flow path 61 and mixes with the fluid FL1.

By the way, in the rotary valve 10 in which the inflow side packing 71 is arranged between the flat surface portion 34 and the valve body portion 52, the dimension of the valve body portion 52 in the direction along the surface of the packing body portion 72, and thus the size of the rotary valve 10 The dimension in the radial direction is greatly affected by the packing body portion 72 .

In this regard, in the present embodiment, as shown in FIG. 5, a portion of the first seal portion 74a in the circumferential direction and a portion of the adjacent first seal portion 74b in the circumferential direction overlap (lap) at an overlapping portion 75. ), and another portion of the first seal portion 74 a in the circumferential direction and a portion of the adjacent first seal portion 74 c in the circumferential direction overlap (lap) at an overlapping portion 79 .

Similarly, as shown in FIG. 6, a portion of the second seal portion 81a in the circumferential direction and a portion of the adjacent second seal portion 81b in the circumferential direction overlap (lap) at an overlapping portion 82, so that the second seal portion 81a Another portion of the seal portion 81 a in the circumferential direction and a portion of the adjacent second seal portion 81 c in the circumferential direction overlap (lap) at an overlapping portion 83 .

Therefore, compared to the case where the adjacent first seal portions 74a and 74b are separated from each other and the adjacent second seal portions 81a and 81b (not shown) are separated from each other (see FIG. 16), the distance between the adjacent through holes 73a and 73b is reduced. distance becomes shorter. Further, compared to the case where the adjacent first seal portions 74a and 74c are separated from each other and the adjacent second seal portions 81a and 81c (not shown) are separated from each other (see FIG. 16), the distance between the adjacent through holes 73a and 73c is reduced. distance becomes shorter.

As a result, the dimension of the inflow side packing 71 in the direction along the surface of the packing main body portion 72 is reduced. As a result, the distance between the adjacent inlets 42 and 44 is shortened, and the size of the rotary valve 10 can be reduced in the direction along the surface, that is, in the radial direction.

In addition, in the present embodiment, the overlapping portion 82 also serves as part of the circumferential direction of each of the second seal portions 81a and 81b. Moreover, the overlapping portion 83 also serves as a part of the second seal portions 81a and 81c in the circumferential direction. Therefore, compared to the case where a portion of the second seal portion 81a in the circumferential direction and a portion of the adjacent second seal portion 81b in the circumferential direction do not overlap (lap) (see FIG. 16), all the second seal portions 81a The contact areas of the seal portions 81a, 81b, and 81c with the valve body portion 52 are reduced. Therefore, the load required for sealing can be reduced, and the torque required to rotate the valve body 52 when switching the connection state between the flow paths 101, 103 and the flow paths 111, 113, 115 can be reduced. can.

Here, if, as shown in FIG. 15, the slit 78 is not provided even though a portion of the first seal portion 74a in the circumferential direction overlaps a portion of the adjacent first seal portion 74b in the circumferential direction. In the overlapping portion 75, the dimension (width) in the radial direction of the first seal portions 74a and 74b is larger than the width in the non-overlapping portion. Accordingly, in the overlapping portion 75, the dimension (compression margin A) that allows elastic deformation in the thickness direction of the packing main body portion 72 due to compression becomes smaller than that in the non-overlapping portion. Moreover, in the overlapping portion 75, the surface pressure generated by pressing against the flat portion 34 is increased compared to the non-overlapping portion. This is because the cross-sectional area of the first seal portions 74a and 74b (the portion below the chain double-dashed line in FIG. 15) is larger in the overlapping portion 75 than in the non-overlapping portion. Although not shown, the same applies to overlapping portions 79 of adjacent first seal portions 74a and 74c.

In this regard, in this embodiment, as shown in FIGS. The compression allowance A can be made larger than that. In addition, the slits 78 and 80 can reduce the cross-sectional area, and can reduce variations in surface pressure generated by pressing against the plane portion 34 between the overlapping portions 75 and 79 and the non-overlapping portions.

By the way, when assembling the inflow side packing 71 to the rotary valve 10, as shown in FIG. If, as indicated by arrow B in FIG. 11, the flat portion 34 is pushed in an inclined direction and approaches in the same direction, the following phenomenon may occur. That is, of the overlapping portion 75, the flexible portions 75a and 75b on both sides in the width direction of the slit 78 should not be elastically deformed into the desired shape (see FIG. 10) such that the distance between them widens as they approach the plane portion 34. is. For example, as shown in FIG. 11, there is a concern that both flexible portions 75a and 75b may be elastically deformed so as to fall in the same direction while contacting each other without expanding. The sealing performance is lower than when both flexible portions 75a and 75b are elastically deformed into the desired shape. Although not shown, the same applies to the flexible portions 79a and 79b in the overlapping portion 79. As shown in FIG.

In this regard, in this embodiment, as shown in FIGS. 12 and 13(a) and (b), when the inflow-side packing 71 approaches the flat portion 34 during assembly to the rotary valve 10, the packing The regulated portions 91 to 93 provided on the main body portion 72 come into contact with the regulating portions 87 to 89 provided on the plane portion 34 . More specifically, the protrusions forming the regulating portions 87 to 89 enter the holes forming the regulated portions 91 to 93, so that the regulated portions 91 to 93 come into contact with the regulating portions 87 to 89. . As a result of this contact, the direction in which the packing main body 72 approaches the plane portion 34 with the first seal portions 74a, 74b, and 74c seated on the plane portion 34 as shown in FIG. 9 is indicated by arrow C in FIG. , the direction perpendicular to the plane portion 34 is regulated. It becomes difficult for the packing body portion 72 to approach the plane portion 34 in a direction that is inclined. As a result, the flexible portions 75a and 75b of the overlapping portion 75 seated on the flat portion 34 are compressed in the direction orthogonal to the flat portion 34. As shown in FIG. A phenomenon (see FIG. 11) in which both flexible portions 75a and 75b are elastically deformed so as to fall in the same direction while contacting each other without expanding is less likely to occur. As shown in FIG. 10, the flexible portions 75a and 75b can be elastically deformed into a desired shape in which the distance between the flexible portions 75a and 75b widens as they approach the plane portion 34, thereby suppressing deterioration in sealing performance.

Although not shown, the flexible portions 79a and 79b in the overlapping portion 79 can also be elastically deformed into a desired shape in the same manner as described above.
In particular, in the present embodiment, when the packing main body portion 72 is brought closer to the flat portion 34 during assembly to the rotary valve 10, the contact between the restricted portions 91 to 93 and the restricting portions 87 to 89 is reduced as shown in FIG. , the slits 78 and 80 are sandwiched from both sides in the extending direction of the slits 78 and 80 in a non-contact state. Therefore, the approach direction of the packing main body portion 72 to the flat portion 34 can be more accurately restricted in a state where the first seal portions 74a, 74b, and 74c are seated on the flat portion 34 .

According to this embodiment, the following effects are obtained in addition to the above.
When assembling the inflow side packing 71 to the rotary valve 10, the regulated portions 91, 92, 93 are brought into contact with the regulating portions 87, 88, 89 in the process of bringing the inflow side packing 71 closer to the mounting portion 33 of the cover 31. Thus, the inflow side packing 71 can be positioned with respect to the cover 31 .

At this time, since the portions to be regulated 91 to 93 contact the regulating portions 87 to 89 at a plurality of points, the rotation of the inflow side packing 71 with respect to the cover 31 can be regulated.
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 plurality of openings provided in the plane portion 34 may be the plurality of outflow ports 21 to 23 for the fluids FL1 and FL2 from the storage portion 41, or the inflow ports 42 and 44, unlike the above-described embodiment. A combination with the outflow ports 21 to 23 may also be used.

- The shape of through-hole 73a, 73b, 73c may be changed into a shape different from a circle.
- The number of through-holes in the packing body portion 72 may be two or four or more.
- The slits 78 and 80 may be formed at a plurality of positions in the circumferential direction of the overlapping portions 75 and 79 .

- The slits 78 and 80 may be formed only partially in the circumferential direction of the overlapping portions 75 and 79 .
- The slits 78, 80 in the overlapping portions 75, 79 may be omitted.

- The slits 78, 80 may be formed in the overlapping portions 82, 83 of the second sealing portions 81a, 81b, 81c instead of or in addition to the overlapping portions 75, 79 of the first sealing portions 74a, 74b, 74c. .

- The width of the slits 78 and 80 may be constant in the depth direction.
- The sheets 86 and 100 can be omitted as appropriate.
The regulated portions 91 to 93 may be configured by concave portions that are open on the plane portion 34 side surface of the packing body portion 72 and that are recessed in the thickness direction of the packing body portion 72 instead of the holes.

Contrary to the above-described embodiment, the regulated portions 91 to 93 may be configured by protrusions projecting from the packing main body portion 72 toward the flat portion 34 side. In this case, the restricting portions 87 to 89 are configured by recesses or holes that are open at the flat portion 34 and extend away from the packing main body portion 72 .

- The first seal portions 74a, 74b, 74c and the second seal portions 81a, 81b, 81c do not necessarily have to be formed on the same axis as the through holes 73a, 73b, 73c.
- Each of the first sealing portions 74a, 74b, 74c and the second sealing portions 81a, 81b, 81c may be formed in an annular shape other than an annular shape, such as an elliptical annular shape, or may be a triangular annular shape, a square annular shape, or a pentagonal shape. It may be formed in a polygonal annular shape such as an annular shape.

The above valve packing is not limited to the inflow side packing 71, provided that the packing main body portion is arranged between the flat portion and the valve main body portion, and that the packing main body portion is a packing having a plurality of through holes. , and can also be applied to the packing on the outflow side.

・The above valve packing is not limited to rotary valves, and is also suitable for packing in other types of valves, such as valves in which the flow path is switched by sliding the valve main body along the flat surface. Applicable in the same manner as above. Also in this case, the same effect as the above embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10... Rotary valve 11... Housing 34... Flat part 41... Accommodating part 42, 44... Inflow port (opening part)
DESCRIPTION OF SYMBOLS 51... Valve body 52... Valve main-body part 54... End face 61, 65, 67... Movable flow path 71... Inflow side packing (packing for valves)
DESCRIPTION OF SYMBOLS 72... Packing main-body part 73a, 73b, 73c... Through hole 74a, 74b, 74c... First seal part 75, 79, 82, 83... Overlapping part 78, 80... Slit 81a, 81b, 81c... Second seal part 87, 88, 89... Regulation part 91, 92, 93... Regulated part 101, 103, 111, 113, 115... Flow path FL1, FL2... Fluid

Claims (3)

It is arranged in the middle of a plurality of flow paths for fluid, and includes a storage portion and a flat portion facing the storage portion, and the flat portion is formed with a plurality of openings through which the fluid passes. a housing;
a valve body that has a movable flow path and is movably accommodated in the housing, wherein the movable flow path is open at an end face of the valve body facing the flat surface; ,
a packing disposed between the flat portion and the valve body portion, the skeleton portion of which is composed of the packing body portion;
A valve that changes a connection state between the movable flow path and the opening as the valve body moves,
The packing main body has through-holes that penetrate in the thickness direction of the packing main body in a number equal to or greater than the number of the openings, and one of the through-holes is arranged to face all the openings. be,
An annular first seal portion is formed around each through-hole on the surface of the packing main body on the side of the flat portion and is in contact with the flat portion. A ring-shaped second seal portion is formed around each through-hole and is in contact with the valve body portion. A valve in which a portion of the seal portion in the circumferential direction overlaps, and a portion of the second seal portion in the circumferential direction and a portion of the adjacent second seal portion in the circumferential direction overlap. The adjacent first seal portions overlap each other at the overlapping portion,
The overlapping portion is formed with a slit that is open on the side that contacts the flat portion and extends in the circumferential direction of the overlapping portion,
2. The valve according to claim 1, wherein the bottom portion of the slit is located at a portion of the first seal portion that is further away from the packing body portion toward the flat portion side . When the packing main body portion is assembled to the valve, the packing main body portion is in contact with the restricting portion provided on the flat portion so that the packing main portion is in a state where the first seal portion is seated on the flat portion. 3. The valve according to claim 2, further comprising a regulated portion that regulates a direction of approach to the flat portion in a direction orthogonal to the flat portion.

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