JP6689118B2 - Flow path switching valve - Google Patents

Description

  The present invention relates to a flow path switching valve, and more particularly to a flow path switching valve such as a three-way valve for switching the flow direction (flow path) of a fluid.

  As a flow path switching valve of this type, Patent Document 1 below discloses a valve body in which a pair of outlets are provided at an angle of 90 degrees, and two elastic bodies that open and close the valve seats of the outlets. What provided the valve body and the rotating shaft which opens and closes these valve bodies is disclosed. In the flow path switching valve configured as described above, the bowl-shaped portion is formed so as to have the recessed portion on the front surface side of the valve body, and the elastic deformation of the bowl-shaped portion is used to bring the bowl-shaped portion into close contact with the valve seat of the outlet. Thus, the sealing property between the valve body and the valve seat is secured.

JP, 2013-177965, A

  In the flow path switching valve described in the above-mentioned patent document, the sealing property between the valve body and the valve seat can be secured to some extent, but there is room for further improving the sealing property.

  An object of the present invention is to provide a flow path switching valve capable of improving the sealing property between the valve body and the valve seat.

In order to achieve the above-mentioned object, a flow path switching valve according to the present invention has a valve body, a valve main body provided with a plurality of inlets and outlets having a valve seat and opening into the valve chamber, and the inlet and outlet selectively. A valve body rotatably arranged in the valve chamber for opening and closing, a rotary shaft for driving the valve body to open and close with respect to a valve seat of the inlet and outlet, and fixed to the rotary shaft. A flow path switching valve including an arm portion extending along the radial direction of the rotating shaft and a shaft to which the valve body is fixed , wherein the arm portion is an axis of the rotating shaft. An upper arm and a lower arm that are spaced apart in the direction, and an upper end of the upper arm is provided with an upper through hole into which the upper end of the shaft is loosely inserted. The extended end of the arm is provided with a lower through hole into which the lower end of the shaft is loosely inserted, and the shaft is It mounted to have freedom in the axial direction and the radial direction of the rotating shaft to the arm portion, the valve body, the pivot shaft to have a degree of freedom in the axial direction and the radial direction of the rotating shaft It is characterized by being attached to.

  In another preferred embodiment, the upper through hole and the lower through hole each have an elliptical shape extending in the extending direction of the arm portion.

  In another preferred embodiment, the valve body is provided with a first inlet / outlet and a second inlet / outlet at predetermined angular intervals in a plan view, and the first inlet / outlet is opened / closed inside the valve chamber. A first valve body for opening and a second valve body for opening and closing the second inlet / outlet are fixed to the shaft with their backs facing.

  According to the flow path switching valve of the present invention, since the valve body is attached to the rotary shaft so as to have the degree of freedom in the axial direction and the radial direction of the rotary shaft, when closing the inlet / outlet with the valve body. The valve element can be automatically adjusted in the vertical, horizontal, and rotational directions according to the flow of fluid and the shape of the valve seat. As a result, the center axis of the valve body and the center axis of the inlet / outlet are easily aligned, and the valve body can be surely brought into close contact with the valve seat, so that the sealing property between the valve body and the valve seat is improved. It will be possible.

The perspective view which looked at the flow-path switching valve concerning an embodiment from the outside. The perspective view which looked at the flow-path switching valve concerning an embodiment from the inside. The perspective view which looked at the flow-path switching valve from the upper part in the state where the lid was removed. The perspective view which shows the assembly state of a rotating shaft, an arm part, a shaft, and 1st, 2nd valve body. FIG. 3 is an exploded perspective view of a rotary shaft, an arm portion, a shaft, and first and second valve bodies. The perspective view which shows the rotation shaft, an arm part, the assembly state of a 2nd valve body when a 1st valve body is removed. The side view which shows the assembly state of a rotating shaft, an arm part, a shaft, and a 2nd valve body when a 1st valve body is removed. The perspective view which looked at the contact state of the 1st valve body and the arm part from the lower part. The perspective view which shows the state which closes a 1st outflow port with a 1st valve body.

  Embodiments of a flow path switching valve according to the present invention will be described below with reference to the drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

  1 and 2 are perspective views showing a flow path switching valve according to an embodiment. The flow path switching valve 1 of the present embodiment is a three-way valve for switching the flow direction of fluid. The flow path switching valve 1 is disposed in a corner of the valve body 2 formed in a substantially fan-shaped box shape, and has an upper end exposed to the outside and other portions inside the valve body 2. And a rotary shaft 3 inserted in the.

  The valve body 2 has a bottomed cylindrical body 21 having an open top surface, and a lid body 22 mounted and fixed so as to close the opening of the cylindrical body 21. A valve chamber 4 is formed inside the valve body 2 by the cylinder 21 and the lid 22 (see FIG. 3). The cylindrical body 21 is erected from a fan-shaped bottom portion 21a, a radial portion of the bottom portion 21a, a pair of side wall portions 21b and 21c having a central angle of about 90 degrees, and a circumferential portion 21d that is erected from an arc portion of the bottom portion 21a. Consists of. On the upper surface of the lid body 22, there is further provided a cylindrical accommodating portion 26 for accommodating an intermediate portion 32 of the rotating shaft 3 described later. The housing portion 26 communicates with the valve chamber 4.

  On the bottom surface and the left and right side surfaces of the valve body 2, inlets / outlets 7, 8 and 9 opening to the valve chamber 4 are provided. Here, the inlet / outlet provided on the bottom surface is the inlet 7, and the inlets / outlets provided on the left and right side surfaces are the first outlet 8 and the second outlet 9. And the 1st outflow port 8 and the 2nd outflow port 9 are arrange | positioned at an angular interval of 90 degrees in plan view.

  FIG. 3 is a perspective view of the flow path switching valve with the lid removed, as seen from above. As shown in FIG. 3, inside the valve chamber 4, a first valve body 10 for opening / closing the first outlet 8 and a second valve body 11 for opening / closing the second outlet 9 are mutually backed. They are arranged at a predetermined distance while facing each other. A valve seat 24 that is in close contact with the first valve body 10 when the first valve body 10 closes the first outlet 8 is formed in the center of the side wall portion 21b. At the center of the side wall portion 21c, a valve seat 25 that is in close contact with the second valve body 11 when the second outlet 9 is closed by the second valve body 11 is provided.

  The rotating shaft 3 drives the first valve body 10 to open and close with respect to the valve seat 24 of the first outlet 8, and drives the second valve body 11 to open and close with respect to the valve seat 25 of the second outlet 9. It is rotatably provided on the valve body 2 so as to be movable. The rotating shaft 3 has an upper end portion 31 connected to an output shaft of a drive device (not shown), a lower end portion 33 for fixing an arm portion 5 described later, and an intermediate portion 32 between the upper end portion 31 and the lower end portion 33. It is divided into The upper end portion 31 is exposed to the outside of the valve body 2, and a plurality of teeth that mesh with the output shaft of the drive device are formed on the outer periphery of the upper end portion 31. On the other hand, the intermediate portion 32 and the lower end portion 33 are inserted inside the valve body 2.

  FIG. 4 is a perspective view showing an assembled state of the rotary shaft, the arm portion, the shaft, and the first and second valve bodies, and FIG. 5 is an exploded perspective view of these. In order to secure the sealing property inside the valve chamber 4, the intermediate portion 32 is provided with annular grooves 34 and 35 for mounting an O-ring. The lower end portion 33 is formed with an arm portion 5 which is fixed to the lower end portion 33 and extends along the radial direction of the rotating shaft 3. The arm portion 5 is formed in a C shape and has an upper arm 51 and a lower arm 52 which are arranged at a predetermined interval along the axial direction of the rotating shaft 3 and an axial direction of the rotating shaft 3. The connecting portion 53 extends along and connects the upper arm 51 and the lower arm 52.

  The extended end portion 51a of the upper arm 51 is provided with an upper through hole 51b into which an upper end portion 61a of the shaft 6 described later is loosely inserted. Corresponding to this, the extended end portion 52a of the lower arm 52 is provided with a lower through hole 52b into which a lower end portion 61b of the shaft 6 described later is loosely inserted. The upper through hole 51b and the lower through hole 52b each have an oval shape extending in the extension direction of the arm portion 5 in a plan view. By making both the through holes 51b and 52b oval, the shaft 6 can have a degree of freedom in the direction of the rotation axis 3.

  Further, in order to make it easier to insert the shaft 6 into the upper through hole 51b and the lower through hole 52b, the lower surface of the extending end portion 51a and the upper surface of the extending end portion 52a are tapered so that the distance therebetween gradually increases. Has been processed into. The connecting portion 53 plays a role of reinforcing the upper arm 51 and the lower arm 52.

  The shaft 6 is made of a resin material, and has a cylindrical main body portion 61, a cylindrical mounting portion 62 that projects from the central position of the main body portion 61 to the left and right sides, and that mounts the first valve body 10, and a second valve. It has a cylindrical mounting portion 63 for mounting the body 11. The main body portion 61 further includes an upper end portion 61a and a lower end portion 61b each having a relatively small diameter, and an intermediate portion 61c having a relatively large diameter.

  The diameter of the upper end portion 61a is slightly smaller than the diameter of the upper through hole 51b provided in the extending end portion 51a, and the diameter of the lower end portion 61b is the diameter of the lower through hole 52b provided in the extending end portion 52a. It is slightly smaller. On the other hand, the diameter of the intermediate portion 61c is larger than the diameter of either the upper through hole 51b or the lower through hole 52b. As described above, due to the difference in diameter between the upper end portion 61a, the lower end portion 61b, and the intermediate portion 61c, the upper step surface 64 is located between the upper end portion 61a and the intermediate portion 61c, and the lower step surface is located between the lower end portion 61b and the intermediate portion 61c. Each surface 65 is formed.

  FIG. 6 is a perspective view showing an assembled state of the rotating shaft, the arm portion, the shaft, and the second valve body when the first valve body is removed. As shown in FIG. 6, the tip portion 62a of the mounting portion 62 of the shaft 6 is formed in a disc shape so as to spread around. When the first valve body 10 is attached to the attachment portion 62, the tip portion 62a enters the inside of the first valve body 10 and has an effect of preventing the first valve body 10 from coming off the attachment portion 62. The tip portion of the mounting portion 63 is also formed to have the same structure as the tip portion 62a of the mounting portion 62.

  The 1st valve body 10 and the 2nd valve body 11 are formed in disk shape by elastic materials, such as rubber. In order to be in close contact with the valve seat 24 or the valve seat 25, these valve bodies are gradually reduced in diameter from the inner side to the outer side (the side far from the side close to the shaft 6). In the present embodiment, the shaft 6, the first valve body 10, and the second valve body 11 are integrally formed by, for example, two-color molding. That is, the shaft 6 on the primary side is first molded with a resin material, and then the first valve body 10 and the second valve body 11 on the secondary side are molded with a rubber material integrally with the shaft 6. By doing so, the joint strength between the valve body and the shaft 6 can be increased. Both valve bodies 10 and 11 may be formed of an elastic material into a cup shape, a suction cup shape, a hemispherical shape, or the like.

  When attaching the shaft 6 to the arm portion 5, for example, while holding the shaft 6 obliquely, the upper end portion 61a is first inserted into the upper through hole 51b provided in the extended end portion 51a of the upper arm 51, and then the lower end. The upper arm 51 and the lower arm 52 are elastically deformed in the vertical direction and inserted into the lower through hole 52b formed in the extending end portion 52a of the lower arm 52. The diameter of the lower end portion 61b of the shaft 6 is smaller than the diameter of the lower through hole 52b, and the diameter of the intermediate portion 61c is larger than the diameter of the lower through hole 52b. The lower step surface 65 contacts the upper surface of the extending end portion 52 a of the lower arm 52. As a result, the shaft 6 is attached to the arm portion 5 such that its longitudinal direction is parallel to the axial direction of the rotating shaft 3.

  FIG. 7 is a side view showing an assembled state of the rotating shaft, the arm portion, the shaft, and the second valve body when the first valve body is removed. As shown in FIG. 7, when the shaft 6 is attached to the arm portion 5, there is a distance t (t> 0) from the upper step surface 64 of the shaft 6 to the lower surface of the extended end portion 51a of the upper arm 51. Is set. That is, the shaft 6 is attached to the arm portion 5 so as to have a certain degree of freedom in the axial direction of the rotating shaft 3.

  Further, since the diameter of the upper end portion 61a of the shaft 6 is smaller than the diameter of the upper through hole 51b, the upper end portion 61a inserted into the upper through hole 51b has the upper end portion 61a of the rotary shaft 3 limited to the upper through hole 51b. Can move freely in the radial direction. Similarly, since the diameter of the lower end portion 61b is smaller than the diameter of the lower through hole 52b, the lower end portion 61b inserted into the lower through hole 52b also has the rotating shaft 3 in the range limited to the lower through hole 52b. It can move freely in the radial direction (see FIG. 3). That is, the shaft 6 is attached to the arm portion 5 so as to have a degree of freedom also in the radial direction of the rotating shaft 3.

  Further, since the diameter of the upper end portion 61a of the shaft 6 is smaller than the diameter of the upper through hole 51b and the diameter of the lower end portion 61b is smaller than the diameter of the lower through hole 52b, the shaft 6 is attached to the arm portion 5, It is rotatable within a predetermined range.

  FIG. 8 is a perspective view of the contact state between the first valve body and the arm portion as viewed from below. The first valve body 10 and the second valve body 11 also rotate with the rotation of the shaft 6, but when the outer edge portion of the first valve body 10 contacts the upper arm 51 or the lower arm 52, or When the outer edge portion of the two-valve body 11 abuts the upper arm 51 or the lower arm 52, the rotation of the shaft 6 is restricted, and further rotation cannot be performed. That is, the rotation range of the first valve body 10 and the second valve body 11 is from the position where the outer edge portion of the first valve body 10 abuts the upper arm 51 and the lower arm 52 to the outer edge portion of the second valve body 11. Is a range up to a position where the upper arm 51 and the lower arm 52 come into contact with each other.

  In the flow path switching valve 1 configured as described above, for example, when the rotating shaft 3 is rotated clockwise from the state shown in FIG. 3, the arm portion 5 fixed to the rotating shaft 3 is rotated and the arm portion 5 is rotated. The shaft 6 attached to 5 is urged clockwise by the arm portion 5. For this reason, the first valve body 10 fixed to the shaft 6 approaches the first outlet port 8 and comes into close contact with the valve seat 24 of the first outlet port 8 to close the first outlet port 8 (Fig. 9). At this time, the fluid from the inflow port 7 flows to the second outflow port 9 via the valve chamber 4.

  On the other hand, when the rotating shaft 3 is rotated counterclockwise, the shaft 6 attached to the arm portion 5 is urged in the counterclockwise direction by the arm portion 5, so that the second valve body 11 moves in the second flow direction. The second outlet 9 is closed by approaching and closely contacting the valve seat 25 of the outlet 9. At this time, since the first valve body 10 separates from the valve seat 24 of the first outlet 8, the first outlet 8 is fully opened. Therefore, the fluid from the inflow port 7 flows to the first outflow port 8 via the valve chamber 4.

  In addition, as shown in FIG. 3, when the first valve body 10 and the second valve body 11 are arranged between the first outlet 8 and the second outlet 9, the first outlet 8 and the second outlet 9 are disposed. Since both of the two outlets 9 are fully opened, a part of the fluid from the inlet 7 flows to the first outlet 8 via the valve chamber 4 and a part of the fluid from the second outlet 8 via the valve chamber 4. It flows to 9. That is, the fluid from the inflow port 7 flows into both the first outflow port 8 and the second outflow port 9.

  According to the flow path switching valve 1 according to the present embodiment, the shaft 6 is attached to the arm portion 5 so as to have a degree of freedom in the axial direction and the radial direction of the rotating shaft 3, so that the shaft 6 is fixed to the arm portion 5. The first valve body 10 and the second valve body 11 thus formed have a degree of freedom in the axial direction and the radial direction of the rotation shaft 3 and can rotate with the rotation of the shaft 6.

  Therefore, for example, when the first outlet 8 is closed by the first valve body 10, while the first valve body 10 is supported by the shaft 6, the fluid flow and the shape of the valve seat 24 of the first outlet 8 are adjusted to match. The vertical axis, the horizontal axis, and the rotational direction can be automatically adjusted, and the central axis of the first valve body 10 and the central axis of the first outlet 8 can easily coincide with each other. That is, the first valve body 10 has a self-centering function. Therefore, even if there is a positional deviation with the first outlet 8, the first valve body 10 automatically adjusts so as to eliminate the positional deviation, and is aligned with the central axis of the first outlet 8. It can be brought into close contact with the valve seat 24 of the first outlet 8. As a result, the sealability between the first valve body 10 and the valve seat 24 can be reliably improved. In addition, also when closing the 2nd outflow port 9 with the 2nd valve body 11, the same effect can be acquired.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. You can make changes. For example, in the above-described embodiment, the upper through hole 51b and the lower through hole 52b have been described by taking an example of exhibiting an elliptical shape in a plan view, but the shape of these through holes may be a circle or an ellipse. Further, although the three-way valve has been described in the above embodiment, the present invention is also applicable to a two-way valve. In the case of a two-way valve, one of the first valve body 10 and the second valve body 11 may be omitted.

1 flow path switching valve 2 valve body 3 rotating shaft 4 valve chamber 5 arm part 6 shaft 7 inflow port 8 first outflow port 9 second outflow port 10 first valve body 11 second valve body 21 cylindrical body 21a bottom 21b, 21c Side wall part 21d Circumferential part 22 Lids 24, 25 Valve seat 26 Housing part 51 Upper arm 51a Extended end part 51b Upper through hole 52 Lower arm 52a Extended end part 52b Lower through hole 61 Main body part 61a Upper end part 61b Lower end portion 62, 63 mounting portion

Claims (3)

A valve chamber and a valve body provided with a plurality of inlets and outlets having a valve seat and opening into the valve chamber;
A valve body rotatably arranged in the valve chamber to selectively open and close the inlet and outlet,
A rotary shaft for driving the valve body to open and close with respect to the valve seat of the inlet and outlet ,
An arm portion fixed to the rotation shaft and extending along the radial direction of the rotation shaft;
A shaft to which the valve element is fixed, and a flow path switching valve,
The arm portion has an upper arm and a lower arm that are arranged apart from each other along the axial direction of the rotating shaft,
An upper through hole into which the upper end of the shaft is loosely inserted is provided at the extended end of the upper arm,
The extended end of the lower arm is provided with a lower through hole into which the lower end of the shaft is loosely inserted,
The shaft is attached to the arm portion so as to have a degree of freedom in an axial direction and a radial direction of the rotating shaft,
The flow path switching valve, wherein the valve body is attached to the rotating shaft so as to have a degree of freedom in an axial direction and a radial direction of the rotating shaft. The flow path switching valve according to claim 1 , wherein the upper through hole and the lower through hole each have an elliptical shape extending in the extending direction of the arm portion. The valve body is provided with a first inlet / outlet and a second inlet / outlet at predetermined angular intervals in plan view,
Inside the valve chamber, a first valve body for opening / closing the first inlet / outlet and a second valve body for opening / closing the second inlet / outlet are fixed to the shaft with their backs facing each other. The flow path switching valve according to claim 1 , wherein the flow path switching valve is provided.

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