JP4895360B2 - Switching valve - Google Patents

Description

  The present invention relates to a switching valve that switches a fluid flow path, and in particular, includes a housing in which an inflow port and a plurality of outflow ports are formed, and a valve body provided in the housing, on a circumferential surface of the valve body. The present invention relates to a switching valve in which a flow groove is formed.

As a switching valve including a housing and a valve body that is rotatably provided in the housing, for example, a switching valve described in Patent Document 1 is known. The switching valve described in Patent Literature 1 includes a housing in which a space having one inflow port and a plurality of outflow ports is formed, and a valve body provided in the housing. A through-hole penetrating the inside is formed in the rotating shaft core portion of the valve body. One side of the through hole communicates with the inflow port of the housing, and the other side communicates with each outflow port formed in the housing.
In such a switching valve, the fluid flows out from the inlet of the housing through the through hole of the valve body, and flows out of the outlet connected to the through hole by the rotation of the valve body.

  By the way, the switching valve is used for various applications, and depending on the application, it may be used as an ultra-small switching valve such as a so-called micro valve. In the ultra-small switching valve, the valve body provided in the housing has a diameter of about 10 mm to 5 mm. As a structure of a switching valve having a valve body of such a size, it is very difficult to form a through-hole penetrating the rotating shaft core portion of the valve body as in Patent Document 1.

Conventionally, a flow rate adjusting valve as in Patent Document 2 is known. The flow rate adjusting valve includes a holder in which an accommodating portion for accommodating the cock is formed, a cock rotatably provided in the accommodating portion of the holder, and a pair of O-rings fitted on the upper and lower sides of the cock. ing. An inlet and an outlet are opened in the accommodating portion of the holder of the flow rate adjusting valve, and a squeezing groove that gradually decreases in the circumferential direction is formed on the surface (outer peripheral surface) in contact with the cock holder. Is formed.
Such a flow rate adjusting valve is configured such that the cock is kept airtight with respect to the holder by a pair of upper and lower O-rings, and when the cock is rotated, the inlet and the outlet communicate with each other through the squeezing groove. Fluid flows out from the inlet to the outlet.

Forming a groove on the outer peripheral surface of the member like the cock of the flow rate adjusting valve is easier to process than forming a through hole in the valve body as in Patent Document 1.
Therefore, the flow rate adjusting valve technology is applied to a switching valve, a groove is formed in the surface of the switching valve that contacts the housing, and fluid flows between the inner peripheral surface of the housing and the outer peripheral surface of the valve body. It is conceivable to form a groove.
JP-A-9-119532 Japanese Patent Application Laid-Open No. 64-12179

  However, when the flow groove is formed on the peripheral surface of the valve body, the fluid may enter a portion where the flow groove is not formed (a slight gap between the peripheral surface of the valve body and the peripheral surface of the housing). . In the flow rate adjusting valve, a pair of upper and lower O-rings prevent fluid that enters the gap between the valve body and the housing from leaking to the outside. However, since the switching valve has two or more outlets, when one fluid A flows through the predetermined outlet, the one fluid A enters the gap between the housing and the valve body. The fluid A may collect in the gap between the upper and lower O-packings. Then, when the valve body is switched to another outlet in order to flow another fluid B, the one fluid A before switching accumulated in the gap of the packing is mixed with the other fluid B and flows into the other outlet. There is a fear.

  This invention makes it a subject to provide the switching valve which can be produced easily and does not have a possibility that the fluid before switching may mix with another outflow port.

The present invention relates to a housing in which a housing part for housing a rotatable valve body is formed, a valve body in which a curved surface part in contact with a circumferential surface of the housing part of the housing is formed, and a circumferential surface of the housing housing part An inflow port that is open, a first outflow port and a second outflow port that are opened in a peripheral surface of the housing portion of the housing, and a flow groove that is provided in a curved surface portion of the valve body. By rotating to the first position, the fluid can flow from the inlet to the first outlet through the flow groove, and by rotating the valve body to the second position, the flow from the inlet to the first groove. And a rubber elastic member formed with an endless protrusion that is in contact with the peripheral surface of the accommodating portion while being elastically deformed is a switching valve that can flow fluid to the second outlet. Provided in the region surrounded by the endless protrusion of the rubber elastic member. Cage, when rotating the valve body in a first position, a second sealing portion for sealing the second outlet by the projecting portion in contact with the elastic deformation around the opening of the second outlet, or, the valve body Is rotated to the second position, at least one of the first sealing portion that seals the first outflow port by the protruding portion that is elastically deformed around the opening of the first outflow port is the rubber elasticity. Provided is a switching valve which is integrally extended from a member .

The switching valve of the present invention includes a housing in which a housing portion that houses a rotatable valve body is formed, and a valve body in which a curved surface portion that is in contact with the peripheral surface of the housing portion of the housing is formed. A circulation groove is provided in the curved surface portion of the body.
An inflow port is opened in the peripheral surface of the housing accommodating portion, and fluid from the inflow port flows into the flow groove.
Moreover, the 1st outflow port and the 2nd outflow port are opened by the surrounding surface of the accommodating part of a housing. Then, by rotating the valve body to the first position, the inflow port and the first outflow port communicate with each other via the flow groove, and the fluid entering from the inflow port can be flowed to the first outflow port. Further, by rotating the valve body to the second position, the inflow port and the second outflow port communicate with each other through the flow groove, and the fluid from the inflow port can flow to the second outflow port.

In such a switching valve, a rubber elastic member formed with an endless protrusion that comes into contact with the peripheral surface of the housing portion while being elastically deformed is provided on the curved surface portion of the valve body, and the flow groove is an endless portion of the rubber elastic member Formed in a region surrounded by the protrusions. Therefore, the endless protrusions of the rubber elastic member provided on the valve body are in contact with the peripheral surface of the housing portion to keep the valve body and the housing portion airtight. Since the flow groove on the peripheral surface of the valve body is formed in a region surrounded by the endless protrusion, the fluid passes only through the flow groove, and the fluid passes between the peripheral surface of the valve body and the housing housing portion. There is no risk of intrusion. Therefore, for example, when the valve body is positioned at the first position and one fluid A flows out from the first outlet, the valve body is switched to the second position and another fluid B flows through the second outlet. In addition, it is possible to prevent the other fluid B and the one fluid A from being mixed.
In addition, the switching valve has a flow groove formed by a rubber elastic member provided on the curved surface portion of the valve body. Therefore, unlike the conventional switching valve, the switching valve penetrates the rotating shaft core portion of the valve body. Since it is not necessary to perform any processing, it can be easily manufactured.
Furthermore, the switching valve of the present invention has a second seal that seals the second outlet by a projecting portion that is elastically deformed around the opening of the second outlet when the valve body is rotated to the first position. Or at least one of the first sealing portion that seals the first outlet by a protrusion that contacts the outer periphery of the first outlet while being elastically deformed when the valve body is rotated to the second position. One of them is integrally extended from the rubber elastic member.
For example, when the valve body is rotated to the first position, the fluid outlet does not flow into the second fluid outlet because the fluid outlet and the second fluid outlet do not communicate with each other through the flow groove. However, when a pressure equal to or higher than atmospheric pressure is applied to the second outlet side, the fluid may flow backward from the second outlet side to the valve element side. In this regard, as described above, by providing the rubber elastic member with the first sealing portion or the second sealing portion that seals the first outlet or the second outlet, the fluid that has flowed backward is allowed to flow between the housing and the valve body. It is possible to prevent intrusion during the period.

  Moreover, in the preferable aspect of this invention, the said switching valve by which the said rubber elastic member is attached with respect to a valve body so that attachment or detachment is possible is preferable.

  Thus, when it is set as the structure attached so that attachment or detachment is possible, it can replace | exchange for the rubber elastic member from which a material, a shape, etc. differ according to the property of a fluid, pressure sending, etc. Further, when the parts deteriorate over time, it is possible to replace only the rubber elastic member without replacing the entire valve body, and maintenance can be easily performed.

  Moreover, it is preferable that the protrusions of the first sealing part and the second sealing part are formed lower than the endless protrusions of the rubber elastic member.

As described above, when the protrusions of the first sealing part and the second sealing part are formed lower than the endless protrusions of the rubber elastic member, the accommodating parts for the protrusions of the first sealing part and the second sealing part. The contact pressure with respect to the peripheral surface is smaller than that of the endless protrusion of the rubber elastic member. However, it is difficult to assume that the pressure of the fluid that flows backward is higher than the pressure of the fluid that flows in from the inlet, and thus the backward flow can be sufficiently prevented even if the contact pressure is low.
Thus, by reducing the contact pressure between the first sealing portion and the second sealing portion, the frictional force between the housing and the valve body that is generated when the valve body is rotated is reduced, and the valve body can be easily made. Can be rotated. Further, wear of the rubber elastic member can be suppressed.

  The present invention can provide a switching valve that can be easily manufactured as compared with a conventional switching valve and that does not mix the fluid before switching with the fluid after switching when a different fluid is flowed.

Hereinafter, the present invention will be specifically described with reference to the drawings.
The size of the switching valve of the present invention is not limited, but in this embodiment, the switching valve is adapted to a so-called micro valve having a size of about (25 mm × 15 mm × 20 mm) to (15 mm × 8 mm × 10 mm). Will be described.

  As shown in FIGS. 1 and 2, the switching valve 1 of the present embodiment includes a housing 10 in which a housing part that houses a rotatable valve body 20 is formed, and a peripheral surface 11 a of the housing part of the housing 10. The valve body 20 formed with the curved surface portion 21 in contact therewith, the inlet 30, the first outlet 40 and the second outlet 50 opened in the peripheral surface 11a of the housing portion of the housing 10, and the curved surface portion 21 of the valve body 20. And a flow groove 60 provided in the.

As shown in FIG. 3, the housing 10 is formed in a rectangular shape in plan view, and a cylindrical accommodating portion 11 is formed in the center. The diameter of the accommodating portion 11 can be set to, for example, 10 mm to 5 mm. Moreover, the dimension of the housing 10 can be made into 10 mm-15 mm of length L (refer FIG. 3) 10 mm-15 mm, and width W (refer FIG. 3), for example.
The housing 10 includes an outer peripheral member 12 that forms an outer peripheral portion and an inner peripheral member 13 that forms an inner peripheral portion, and the outer peripheral member 13 and the inner peripheral member 12 can be removed.

  The outer peripheral member 12 is formed in a rectangular shape in plan view, and an opening in a rectangular shape in plan view for accommodating the inner peripheral member 13 is formed therein. In the outer peripheral member 12, screw holes 12a to 12c penetrating outward from the opening side are formed in three directions on the basis of the center of the opening.

Among the three screw holes 12a to 12c, the two screw holes 12a and 12c provided on both outer sides have the same penetration direction, and the penetration direction of the remaining one screw hole 12b is the screw hole 12a. , 12c with respect to the penetration direction of 12c. The screw holes 12a and 12c having the same penetration direction have a straight penetration axis.
The screw holes 12a and 12c having the same penetration direction are formed closer to the screw hole 12b. On the other hand, the screw holes 12b are formed at the central portion of the outer peripheral member 12 at equal intervals with respect to the positions where the screw holes 12a and 12c are formed.
Moreover, as shown in FIG. 2, the outer peripheral member 12 has a fixed height, and each screw hole 12a-12c is formed in the same height position.

  As shown in FIG. 3, the inner peripheral member 13 is formed in a rectangular shape in plan view, and the accommodating portion 11 is formed therein. The inner peripheral member 13 is accommodated in the opening of the outer peripheral member 12 so that the outer peripheral end surface is in contact with the inner side of the outer peripheral member 12. In the inner circumferential member 13, pores 13 a to 13 c that penetrate from the housing portion 11 side to the outside (outer circumferential member 12 side) are formed in three directions with respect to the center of the housing portion 11.

  The pores 13a to 13c are directed to the main body portion B having a smaller diameter than the screw holes 12a to 12c, the inner end portion A formed on the accommodating portion 11 side having a smaller diameter than the main body portion B, and the outer peripheral member 12 side. And an outer end portion C formed to expand in a tapered shape. The diameter of the main body portion B can be set to 0.5 mm to 2 mm, for example, and the diameter of the inner end portion A can be set to 0.1 mm to 1.5 mm, for example.

The fine holes 13 a to 13 c are formed at positions corresponding to the screw holes 12 a to 12 c of the outer peripheral member 13 when the outer peripheral member 12 is attached to the inner peripheral member 13.
Specifically, each of the pores 13a to 13c coincides with the center of each of the screw holes 12a to 12c formed in the outer peripheral member 12 in a state where the inner peripheral member 13 is accommodated in the opening of the outer peripheral member 12. The screw holes 12a to 12c communicate with each other to form one linear hole.
In the following description, a straight hole formed by the screw hole 12a and the fine hole 13a is referred to as a first outflow path 41, and a straight hole formed by the screw hole 12b and the fine hole 13b is referred to as an inflow path 31. The linear hole formed by the screw hole 12 c and the fine hole 13 c is called a second outflow path 51.

  The first outflow path 41 and the second outflow path 51 are formed in a straight line, and the inflow path 31 is formed in a direction different from the first outflow path 41 and the second outflow path 51 by 90 degrees. Moreover, the inflow path 31, the 1st outflow path 41, and the 2nd outflow path 51 are formed in the same height position (that is, along the circumferential direction of the valve body 20).

  As shown in FIG. 1, the inflow passage 31 is inserted through a bolt 32, a ring joint 33 attached to the tip of the threaded portion 321 of the bolt 32, and a shaft through hole of the bolt 32 and the ring joint 33. The tubular body 34 is inserted. By inserting these into the inflow path 31, the outer peripheral member 12 and the inner peripheral member 13 are fixed.

The bolt 32 is screwed into the screw hole 12 b of the inflow path 31 of the outer peripheral member 13. The screw portion 321 of the bolt 32 is formed longer than the screw hole 12b.
Further, as shown in FIG. 4, the bolt 32 is formed with a linear hole 325 penetrating the center from the head 323 to the tip of the screw portion 321. The diameter of the hole 325 is formed to be substantially the same as that of the main body portion B of the pore 13b. In addition, a recessed portion 324 having a diameter larger than that of the hole 325 is formed at the center of the tip portion of the screw portion 321.

The ring joint 33 is fitted into the recess 324 at the tip of the bolt 32 and is fitted into the outer end portion C of the screw hole 12b. The ring joint 33 is formed in a cylindrical shape, and has an outer diameter that can be fitted into the recess 324.
In addition, the front-end | tip part 331 of the ring joint 33 is formed in the taper-shaped taper so that it can fit in the taper-shaped outer end part C of the pore 13b. Further, the hole 333 of the ring joint 33 is formed to have substantially the same diameter as the hole 325 of the bolt 32. Further, when the ring joint 33 is fitted into the recess 324 and the ring joint 33 is attached to the bolt 32, the hole 333 of the ring joint 33 communicates with the tip side of the hole 325 of the bolt 32.

  The tubular body 34 is a pipe-shaped member having a through hole 340. As shown in FIG. 1, the tubular body 34 is inserted into the holes of the bolt 32 and the ring joint 33, and is inserted to the main body portion B of the pore 13b. In this way, one end of the tube 34 is inserted into the main body portion B of the pore 13b, and the opposite end is connected to a fluid supply source (not shown).

  The bolt 32, the ring joint 33, and the pipe body 34 are fitted into the inflow path 31 and fixed to the housing 10 as follows. First, the rear end portion of the ring joint 33 is fitted into the recessed portion 324 of the bolt 32, the ring joint 33 is attached to the bolt 32, and then the tube body 34 is inserted into the hole 325 of the bolt 32 and the hole 333 of the ring joint 33. To do. As shown in FIG. 1, in this state, the distal end portion 341 of the tube body 34 is inserted into the pore 13 b of the inflow passage 31, and the bolt 32 is screwed into the screw hole 12 b of the inflow passage 31. As the bolt 32 is screwed, the ring joint 33 is plastically deformed by being pinched between the front end portion of the bolt 32 and the outer end portion C of the inner peripheral member 13. Due to the deformation of the ring joint 33, the outer surface of the ring joint 33 and the outer end portion C of the inner peripheral member 13, and the inner peripheral surface of the ring joint 33 and the tubular body 34 are in airtight contact with each other. Thus, the ring joint 33 is crushed using the bolt 32, and the tube body 34 is fixed to the housing 10 via the ring joint 33.

In this embodiment, the outer peripheral member 12 and the inner peripheral member 13 are fixed by the cooperation of the three members of the ring joint 33, the bolt 32, and the tubular body 34, and the fixed outer peripheral member 12 and the inner peripheral member 13 are fixed. Thus, the housing 10 is configured.
Specifically, the tube 32 is fixed to the housing 10 by screwing the bolt 32 on which the ring joint 33 and the tube 34 are set as described above to the outer member 12, and the outer member 12. The inner peripheral member 13 is fixed.
Since the ring joint 33 is pinched and plastically deformed by the peripheral surface of the housing 10, the material of the ring joint 33 is preferably a material having lower rigidity than the housing 10.

  In addition, since the bolt 32 is formed such that the length of the screw portion 321 is longer than that of the screw hole 12b, a part of the screw portion 321 of the bolt 32 and the head 323 are inserted in the inflow path 31. Projecting to the outside of the housing 10.

In the first outflow path 41 and the second outflow path 51, similarly to the inflow path 31, the bolt 32, the ring joint 33, and the pipe body 34 are fitted and fixed to the housing 10, and the ring joint 33 The outer peripheral member 12 and the inner peripheral member 13 are fixed by, for example. Since the configuration, fixing method, and the like of the bolt 32, the ring joint 33, and the pipe body 34 for the first outflow passage 41 and the second outflow passage 51 are the same as those of the inflow passage 31, description thereof is omitted.
In addition, the pipe body 34 fitted and fixed in the first outflow path 41 and the second outflow path 51 has an opposite end connected to a fluid discharge section such as a container (not shown).

The portion opened in the peripheral surface 11a of the inflow passage 31 forms an inflow port 30, and the portion opened in the peripheral surface 11a of the first outflow passage 41 forms a first outflow port 40, A portion opened on the peripheral surface 11 a of the two outflow passages 51 forms a second outlet 50.
Therefore, the inflow port 30, the 1st outflow port 40, and the 2nd outflow port 50 are formed of the inner side edge part A of pore 13a-13c.

  As shown in FIGS. 1 and 2, the valve body 20 provided in the housing portion 11 of the housing 10 is rotatably housed in the housing portion 11 formed at the center of the housing 10. The valve body 20 is formed in a columnar shape, for example, so as to be in airtight contact with the peripheral surface of the housing portion 11. The valve body 20 is provided so as to be rotatable while being in contact with the peripheral surface 11a of the accommodating portion 11 with the central portion of the accommodating portion 11 having a cylindrical peripheral surface as a rotation axis.

  A circulation groove 60 for allowing fluid to flow between the valve body 20 and the housing 10 is formed on a circumferential surface (hereinafter, referred to as a curved surface portion 21) of the valve body 20 that is in contact with the circumferential surface 11a of the storage portion 11. . The flow groove 60 is formed in a region surrounded by the endless projection 71 of the rubber elastic member 70 formed with an endless projection that comes into contact with the peripheral surface 11a of the housing portion 11 while being elastically deformed.

  Specifically, as shown in FIG. 5, an attachment groove 23 for attaching the rubber elastic member 70 to the curved surface portion 21 is formed on the curved surface portion 21 of the valve body 20. The rubber elastic member 70 is fitted in the mounting groove 23 and is detachably attached to the curved surface portion 21.

The attachment groove 23 is provided along the circumferential direction of the curved surface portion 21 (the rotation direction of the valve body 20). The circumferential length L1 of the mounting groove 23 is an arc corresponding to an angle R1 connecting the rotation center point of the valve body 20 (the central portion of the accommodating portion 11) and both ends of the mounting groove 23 as shown in FIG. Corresponds to the length. The length of this arc (the length L1 of the mounting groove 23) is longer than the length of the arc corresponding to the angle R1 ′ connecting the rotation center point of the valve body 20 with the first outlet 40 and the second outlet 50. Largely formed.
Note that the mounting groove 23 may be formed over the entire circumference of the curved surface portion 21, for example.
The length W1 in the axial direction (height direction) of the mounting groove 23 is the diameter of the inlet 30, the first outlet 40, and the second outlet 50, that is, the inner end A of the pores 13a to 13c. It is formed larger than the diameter.

As shown in FIG. 7A, the rubber elastic member 70 is formed in a band shape in a plan view, and is fitted in the attachment groove 23 with the longitudinal direction thereof being in the circumferential direction of the attachment groove 23.
The rubber elastic member 70 has an endless protrusion 71 in the longitudinal direction. The endless protrusion 71 is a protrusion having a semicircular cross section formed higher than the depth of the mounting groove 23 (FIG. 7B). The endless protrusion 71 is composed of a rectangular ring-shaped protrusion that is elongated in plan view at the center in the longitudinal direction of the belt-like rubber elastic member 70. A region surrounded by the endless protrusion 71 is a recessed region 72 that is lower than the depth of the mounting groove 23.

Therefore, when the valve body 20 in which the rubber elastic member 70 is fitted in the attachment groove 23 is attached to the accommodating portion 11, the endless protrusion 71 hits the peripheral surface 11a of the accommodating portion 11 and is elastic as shown in FIG. It is deformed (compressed) to come into contact with the peripheral surface 11a, and the recessed area 72 is separated from the peripheral surface 11a to form a space (this space becomes the flow groove 60).
The length L2 in the longitudinal direction of the recessed area 72 (see FIG. 7D) is the rotational center point of the valve body 20 when the rubber elastic member 70 is fitted into the mounting groove 23 as shown in FIG. This corresponds to the length of the arc corresponding to the angle R2 connecting the two ends of the recessed area 72. The length of the arc (the length L2 of the recessed area 72) corresponds to an angle R2 ′ connecting the rotation center point of the valve body 20 and the inlet 30 and the first outlet 40 (or the second outlet 50). It is formed larger than the length of the arc.
Therefore, when the rotation position of the valve body 20 is set to a position as shown in FIG. 8A, the recessed area 72 surrounded by the endless protrusion 71 faces the inlet 30 and the first outlet 40. Therefore, the fluid can flow from the inlet 30 to the first outlet 40 through the flow groove 60.
The rotational position of the valve body 20 that allows fluid to flow from the inlet 30 to the first outlet 40 is referred to as a “first position”.
However, since the endless projection 71 is elastically deformed and comes into contact with the peripheral surface 11a, when the endless projection 71 is elastically deformed by fitting the rubber elastic member 70 into the mounting groove 23, the length L2 in the longitudinal direction of the recessed region 72 is obtained. Is slightly shorter. Therefore, it is necessary to design the recessed area 72 in consideration of this elastic deformation.

Similarly, as illustrated in FIG. 8B, when the valve body 20 is rotated so that the recessed region 72 surrounded by the endless protrusion 71 faces the inflow port 30 and the second outflow port 50. The fluid can flow from the inlet 30 to the second outlet 50 through the flow groove 60.
In addition, the rotational position of the valve body 20 that allows fluid to flow from the inlet 30 to the second outlet 50 is referred to as a “second position”.

In addition, the short direction length W2 (refer FIG.7 (b)) of the dent area | region 72 is formed larger than the diameter of the inflow port 30, the 1st outflow port 40, and the 2nd outflow port 50. As shown in FIG. In this manner, the fluid flowing in from the inflow port 30 does not leak to the outside through the endless protrusion 71 by being formed larger than the inflow port 30, the first outflow port 40, and the second outflow port 50. The fluid can surely flow into the groove 60 and the fluid can surely flow out to the first outlet 40 and the second outlet 50.
Further, since the endless protrusion 71 is elastically deformed and comes into contact with the peripheral surface 11a, when the endless protrusion 71 is elastically deformed by fitting the rubber elastic member 70 into the mounting groove 23, the length of the recessed area 72 in the short direction is reduced. The length W2 is slightly shortened. Therefore, it is necessary to design the recessed area 72 in consideration of this elastic deformation.
In the switching valve 1, as shown in FIG. 2, a handle 24 for rotating the valve body 20 is provided on the upper surface of the valve body 20 via a bolt 25.

As described above, the switching valve 1 of the present embodiment causes fluid to flow through the flow groove 60 formed in the region surrounded by the endless protrusion 71 that comes into contact with the peripheral surface 11a of the housing portion 11 while being elastically deformed. Since the endless projection is in contact with the peripheral surface 11a of the accommodating portion 11 while being elastically deformed around the circulation groove 60, fluid is prevented from leaking from the circulation groove 60 to the outside through the endless projection 71. Is done. Further, for example, the valve body 20 is positioned at the first position, the one fluid A flows out from the inlet 30 to the first outlet 40, and the fluid A remaining in the flow groove 60 is washed away by flowing the cleaning liquid. After that, when the valve body 20 is switched to the second position and the other fluid B is allowed to flow to the second outlet 50, the other fluid B and the one fluid A can be prevented from being mixed.
As described above, the flow groove 60 is formed between the housing 10 and the valve body 20, but since the fluid does not leak from the flow groove 60 to the outside, the valve body 20 is located at the first position. Sometimes, it is possible to prevent the fluid from flowing into the second outlet 50 and the fluid from flowing into the first outlet 40 when the valve body 20 is located at the second position.
Further, the switching valve 1 has a configuration in which a rubber elastic member in which a flow groove 60 is formed in a region surrounded by the endless protrusion 71 is fitted into the valve body. It is not necessary to form a hole and can be easily manufactured.

  In addition, as the height of the endless protrusion 71 is higher, the contact pressure of the endless protrusion 71 with respect to the peripheral surface 11a is higher, and fluid leakage can be more reliably prevented. The frictional force between the projection 71 and the peripheral surface 11a is high, and the valve body 20 is difficult to turn. Therefore, for example, the height of the endless protrusion 71 preferably protrudes from the surface of the curved surface portion 21 of the valve body 20 by about 0.1 mm to 0.5 mm, and is further about 0.2 mm to 0.3 mm. More preferably, it protrudes.

  Further, as shown in FIG. 7, a first sealing portion 80 is integrally formed on one side in the longitudinal direction of the rubber elastic member 70, and a second sealing portion 90 is integrally formed on the other side from the rubber elastic member 70. It is formed to extend.

The first sealing portion 80 has a protruding portion 81 that is in contact with the periphery of the opening of the first outlet 40 while being elastically deformed. The protrusion 81 is formed on one side of the endless protrusion 71. The protrusion 81 is a protrusion formed higher than the depth of the mounting groove 23 and lower than the endless protrusion 71. Therefore, when the first sealing portion 80 is fitted into the mounting groove 23, the protrusion 81 is elastically deformed (compressed) by the peripheral surface 11a and comes into contact with the peripheral surface 11a, as shown in FIG. 7C.
As shown in FIG. 7D, the protrusion 81 has a flat upper surface, and the upper surface is larger than the opening of the first outlet 40. Therefore, the protrusion 81 can contact the periphery of the opening of the first outlet 40 while being elastically deformed, and can seal the first outlet 40.
The protrusion 81 is provided at a position where the rubber elastic member 70 and the first sealing portion 80 are fitted into the mounting groove 23 and the valve body 20 is rotated to the second position as shown in FIG. In this case, it is a position where the first outlet can be sealed in contact with the periphery of the opening of the first outlet 40.

  Thus, when the valve body 20 rotates to the second position and the fluid flows to the second outlet 50, the first outlet 40 is sealed by the first sealing portion 80, The fluid flowing backward from the first outlet 40 can be prevented from flowing between the housing 10 and the valve body 20. That is, when a pressure higher than the atmospheric pressure is applied to the pipe outlet (discharge section) of the first outlet 40, the pipe of the first outlet 40 is flowed when the fluid is flowing from the inlet to the second outlet 50. The fluid existing in advance may flow back into the valve body due to the pressure. As described above, when the first outlet 40 is sealed by the first sealing portion 80, the backflow from the first outlet 40 can be prevented.

  The protrusion 81 is formed lower than the endless protrusion 71, and the contact pressure with the peripheral surface 11 a is lower than the endless protrusion 71. This is because it is difficult to assume that the fluid that flows backward is higher than the fluid that flows in from the inflow port 30, and therefore, even if the contact pressure is low, the backward flow can be sufficiently prevented. In addition, by reducing the contact pressure of the protrusion 81 in this manner, the frictional force with the peripheral surface 11a of the housing 10 generated when the valve body 20 is rotated is reduced, and the valve body is easily rotated. be able to.

The second sealing portion 90 has the same configuration as the first sealing portion 80 except that the position where the second sealing portion 90 is provided is different.
Therefore, as shown in FIG. 8A, the second sealing portion 90 rotates the valve body 20 to the first position, and when the fluid flows to the first outlet 40, the second outlet 50 is sealed. By the second sealing portion 90, it is possible to prevent the fluid existing at the piping destination of the second outlet 50 from flowing back between the housing 10 and the valve body 20.

  The rubber elastic member 70 has a JISA hardness of 50 ° to 90 °, preferably 65 ° to 75 °. Examples of the material of the rubber elastic member 70 include rubbers and elastomers used in known packings.

The rubber elastic member 70 is preferably detachably fitted to the valve body 20, but may be fixed to the valve body 20.
When the rubber elastic member 70 is detachably attached, the rubber elastic member 70 can be replaced with one having a different material, shape, or the like according to the nature of the fluid, the fluid pressure, or the like. Moreover, since it can replace | exchange when it deteriorates, a maintenance is also easy.

  As shown in FIGS. 2 and 5, the valve body 20 is formed with grooves 27 in the circumferential direction for fitting O-rings 26 (ring-shaped rubber packings) on the upper and lower sides of the mounting groove 23 of the curved surface portion 21. An O-ring 26 is fitted in each groove 27. The O-ring 26 can prevent, for example, liquid or gas from entering the flow channel 60 from the outside of the switching valve 1.

  In addition, the following structure can be mentioned as a modification of the 1st sealing part 80 and the 2nd sealing part 90. FIG.

  In the first modified example, as shown in FIGS. 9A and 9B, the first sealing portion 80 has a protruding portion 81 connected to one side of the endless protruding portion 71 and continuous from the one side. Similarly, the second sealing portion 90 is formed so that the protruding portion 91 is connected to the other side of the endless protruding portion 71 and is continuously extended from the other side. Is formed. Further, the protrusions 81 and 91 are formed slightly lower than the vertical height of the endless protrusion 71. Similarly, the rubber elastic member 70 of the modified example is used by being fitted to the valve body 20, and the first outlet 40 and the second outlet 50 are sealed by the first sealing portion 80 and the second sealing portion 90. You can stop.

In the second modified example, as shown in FIG. 9C, the protrusions 81 and 91 of the first modified example are formed from rectangular protrusions that are elongated in plan view. As shown in FIG. 9D, the protrusions 81 and 91 are endless protrusions, and the region surrounded by the protrusions is a recessed region 82 that is lower than the depth of the mounting groove 23, 92.
The recessed area 82 is formed larger than the opening of the first outlet 40. The recessed area 82 is formed to face the first outlet 40 when the rubber elastic member 70 is fitted in the mounting groove 23 and the valve body 20 is rotated to the second position.
Since the recessed area 82 is surrounded by an endless protrusion 81 formed around the recessed area 82, the endless protrusion 81 is elastically deformed and comes into contact with the periphery of the opening of the first outlet 40. It is possible to prevent the fluid flowing backward from the outlet 40 from leaking outside the recessed region 82 beyond the endless projection 81.

  The recessed area 92 has the same configuration as the recessed area 82 of the first sealing portion 80 except that the recessed area 92 is provided in the second sealing portion 90. Therefore, when the valve body 20 is rotated to the first position, the recessed region 92 faces the second outlet 50 and seals the second outlet 50. That is, the endless protrusion 91 formed around the recessed area 92 is in contact with the periphery of the opening of the second outlet 50 while being elastically deformed, and the fluid that flows backward from the second outlet 50 causes the endless protrusion It is possible to prevent leakage beyond the recessed area 92 beyond 91.

Moreover, in the said embodiment, the housing 10 is made into the double structure of the outer peripheral member 12 in which the screw holes 12a-12c are formed, and the inner peripheral member 13 in which the pores 13a-13c are formed.
In the microvalve, a through hole is formed at a predetermined position of the housing 10 so that the inflow port 30, the first outflow port 40, and the second outflow port 50 having a very small diameter open to the peripheral surface 11a of the housing portion 11. There must be. Further, the pipe bodies 34 must be respectively attached to the housing 10 so that the pipe bodies 34 (inflow pipes and outflow pipes) communicate with the inlet 30, the first outlet 40, and the second outlet 50. In order to fix the tube body 34 to the housing 10, it is a simple method to screw the bolt 32 into the housing 10. However, it is difficult in terms of processing to accurately drill a long through hole with a very small diameter at a predetermined position of the housing 10. Moreover, although the screw hole for screwing the bolt 32 is formed while cutting a member using a tap or the like, chips are generated at the time of the tap. When the housing is constituted by one member, chips generated when tapping the screw hole are clogged in through holes (inlet, first outlet and second outlet) located on the extension. For this reason, it is difficult to process a screw hole for fixing the bolt 32 in the housing.
In this respect, the outer peripheral member 12 and the inner peripheral member 13 can be processed separately by configuring the housing 10 with the outer peripheral member 12 and the inner peripheral member 13 as in the above embodiment. Therefore, the screw holes 12a to 12c in which the thread grooves are formed from the outer end surface to the inner end surface of the outer peripheral member 12 can be easily formed. In addition, since both the members 12 and 13 are processed separately, There is no possibility that chips when tapped to form 12a to 12c are clogged in the inlet 30, the first outlet 40, and the second outlet 50 formed in the inner peripheral member 13. Further, by forming the housing 10 with the two members 12 and 13, the thickness of the inner peripheral member 13 can also be reduced, and through holes (inlet, first outlet and first outlet) formed in the inner peripheral member 13 can be reduced. 2 outlets) can be formed with high accuracy.

  In the above embodiment, there are two outlets, but three or more outlets may be formed. The present invention is not limited to the structure shown in each of the above embodiments, and can be appropriately changed in design within the scope intended by the present invention.

It is a cross-sectional view of the switching valve of the present invention. It is a longitudinal cross-sectional view of the same switching valve. However, the valve body, the rubber elastic member, and the O-ring are represented by front views. It is a plane sectional view of a housing. It is a cross-sectional view of a bolt, a ring joint, and a pipe body. It is a front view of a valve body. It is a figure which shows the circumferential direction length of a dent area | region. (A) is a top view of a rubber elastic member, a 1st sealing part, and a 2nd sealing part. (B) is AA sectional drawing of (a). (C) is a cross-sectional view of the valve body to which the rubber elastic member is attached, and shows a contact state between the rubber elastic member and the peripheral surface. (D) is BB sectional drawing of (a). (A) is a cross-sectional view of the valve body to which the rubber elastic member, the first sealing portion, and the second sealing portion are attached. When the rotational position of the valve body is the first position, It shows that a 1st outflow port is connected and a 2nd outflow port is sealed. (B) is a cross-sectional view of the valve body to which the rubber elastic member, the first sealing portion, and the second sealing portion are attached, and when the rotational position of the valve body is the second position, The second outlet is in communication with the first outlet. (A) is a top view of the rubber elastic member of the 1st modification. (B) is CC sectional drawing of (a). (C) is a top view of the rubber elastic member of the 2nd modification. (D) is DD sectional drawing of (c).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switching valve 10 Housing 20 Valve body 30 Inflow port 40 1st outflow port 50 2nd outflow port 60 Flowing groove 70 Rubber elastic member 71 Endless protrusion 72 Recessed area

Claims (3)

A housing in which a housing part for housing a rotatable valve body is formed, a valve body in which a curved surface part in contact with the peripheral surface of the housing part of the housing is formed, and an inlet opening in the peripheral surface of the housing housing part And a first outlet and a second outlet opened in the peripheral surface of the housing accommodating portion, and a flow groove provided in the curved surface portion of the valve body,
By rotating the valve body to the first position, the fluid can flow from the inflow port to the first outflow port through the flow groove, and by rotating the valve body to the second position, A switching valve capable of flowing a fluid to the second outlet through the circulation groove,
A rubber elastic member formed with an endless protrusion that comes into contact with the peripheral surface of the housing portion while being elastically deformed is provided on the curved surface portion of the valve body, and the flow groove is surrounded by the endless protrusion of the rubber elastic member. Formed in the area ,
When the valve body is rotated to the first position, a second sealing portion that seals the second outflow port by a protruding portion that is elastically deformed around the opening of the second outflow port, or the valve body is When rotated to the second position, at least one of the first sealing portion that seals the first outflow port by the protruding portion that is elastically deformed around the opening of the first outflow port is formed from the rubber elastic member. A switching valve characterized by being extended integrally .   The switching valve according to claim 1, wherein the rubber elastic member is detachably attached to the valve body.   The switching valve according to claim 1 or 2, wherein the protrusions of the first sealing part and the second sealing part are formed lower than the endless protrusions of the rubber elastic member.

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