JP7374479B2 - switching valve - Google Patents

Description

The present disclosure relates to switching valves.

A body in which multiple passages are formed, two valves provided in the body, a cylinder provided in the body, and interposed between the cylinder and each valve to alternately open and close each valve by the operation of the cylinder. A switching controller has been proposed that includes a linkage mechanism that allows

Japanese Patent Application Publication No. 08-68470

However, in the above switching controller, the rod of the linking mechanism is configured to pass through the body, so it is difficult to make the rod thicker due to the size constraints of the controller, and it is difficult to make the rod thicker, so it is necessary to supply high driving pressure. The strength of the rod was insufficient depending on the usage conditions, such as when it was unavoidable. For this reason, the stability of opening and closing the valve was not very good.

Therefore, one of the objects of the present disclosure is to provide a switching valve with improved stability in opening and closing the valve portion.

In order to solve the above object, a switching valve that is one aspect of the present disclosure is provided with a body in which a first flow path, a second flow path, and a third flow path are formed, and the body is provided with a body in which a first flow path, a second flow path, and a third flow path are formed. a first valve portion that opens and closes the flow path and the second flow path; a second valve portion that is provided in the body and opens and closes the first flow path and the third flow path; and the first valve portion an actuator that opens and closes the valve; and a switching arm that is connected to the actuator and operates in accordance with the operation of the actuator to open and close the second valve section, and the switching arm is provided on the outside of the body. There is.

The body has a substantially cylindrical shape, the first valve portion is provided on one end side of the body, the second valve portion is provided on the other end side of the body, and the switching arm is provided on the body side. It may extend from one end to a position beyond the other end.

The switching arm has a pair of arm parts and a connecting part, each arm part extends along the axial direction of the body, one end of each arm part is connected to the actuator, and one end of each arm part is connected to the actuator. The other end may extend to a position beyond the second valve part, and the connecting part may extend along the radial direction of the body and connect the other ends of each arm part.

The second valve portion includes a diaphragm and a diaphragm retainer, and a disk-shaped pressing portion is provided in the radially central portion of the connecting portion, and the pressing portion presses the diaphragm retainer. The diaphragm may block communication between the first flow path and the third flow path.

The second valve part is located on the opposite side of the diaphragm holder to the diaphragm side, and has a holder that holds the diaphragm holder, and the holder holds the diaphragm holder on one end side and has a holder on the other end side. may be a spherical portion, and a surface of the pressing portion that comes into contact with the spherical portion may be a flat surface.

According to the present disclosure, it is possible to provide a switching valve with improved stability in opening and closing the valve portion.

FIG. 2 is a partial cross-sectional view of a switching valve according to an embodiment. FIG. 2 is a sectional view of the switching valve taken along line II-II in FIG. 1. FIG.

A switching valve 1 according to an embodiment of the present disclosure will be described with reference to the drawings.

FIG. 1 is a partial cross-sectional view of a switching valve 1 according to this embodiment.
FIG. 2 is a sectional view of the switching valve 1 taken along line II-II in FIG.

As shown in FIG. 1, the switching valve 1 includes a body 2A, a bonnet 2B, an actuator 3, a first valve part 4, a second valve part 5, a switching arm 6, and first to third joints 7 to 3. 9. In the following description, the actuator 3 side of the switching valve 1 is assumed to be the upper side, and the second valve portion 5 side is assumed to be the lower side.

The body 2A is made of, for example, stainless steel, and has a substantially cylindrical shape. A first valve chamber 2c, a second valve chamber 2d, a communication passage 2e, an inflow passage 2f, a first outflow passage 2g, and a second outflow passage 2h are formed in the body 2A. The communication path 2e and the inflow path 2f correspond to a first flow path, the first outflow path 2g corresponds to a second flow path, and the second outflow path 2h corresponds to a third flow path. The communication path 2e has a substantially cylindrical shape.

The first valve chamber 2c opens upward. The second valve chamber 2d opens downward. The communication passage 2e extends in the vertical direction and opens into the first valve chamber 2c and the second valve chamber 2d. The inflow passage 2f extends in the radial direction of the body 2A, and has one end open to the outer peripheral surface of the body 2A and the other end opened to the communication passage 2e. The first outflow passage 2g has a substantially L-shape, with one end opening into the first valve chamber 2c and the other end opening into the outer peripheral surface of the body 2A. The second outflow passage 2h has a substantially L-shape, with one end opening into the second valve chamber 2d and the other end opening into the outer peripheral surface of the body 2A.

An annular first seat 2J is provided at the periphery of a portion of the body 2A where one end of the communication passage 2e and the first valve chamber 2c communicate with each other. An annular second seat 2K is provided around the periphery of the portion where the other end of the communication passage 2e of the body 2A communicates with the second valve chamber 2d.

The bonnet 2B has a substantially cylindrical shape, and is fixed to the body 2A so as to cover the valve chamber 2c by screwing a female screw portion provided on the outer periphery of the lower end of the bonnet 2B to a male screw portion provided on the body 2A. There is. A pair of arm insertion holes 2m are formed in the bonnet 2B.

The actuator 3 includes a cap 3A, a piston 3B, a stem 3C, and a compression coil spring 3D.

The cap 3A has a substantially cylindrical shape with a lid, and is fixed to the bonnet 3 by screwing a female thread provided on the inner periphery of the lower end of the cap 3A to a male thread provided on the outer periphery of the bonnet 2B. A threaded hole 3e is formed in the cap 3A. A pipe joint (not shown) is screwed into the threaded hole 3e.

The piston 3B is supported movably in the vertical direction by the bonnet 2B and the cap 3A. A pressure chamber 3f is defined by the lower surface of the piston 3B and the upper surface of the bonnet 2B. Further, the piston 3B is formed with an air introduction path 3g extending from its upper end to the pressure chamber 3f.

The stem 3C is integrally formed with the piston 3B, and is supported by the bonnet 2B so as to be movable in the vertical direction. The stem 3C moves toward and away from a first diaphragm 4A, which will be described later, to bring the first diaphragm 4A into contact with and away from the first sheet 2J via a first diaphragm presser 4C.

The compression coil spring 3D is disposed between the cap 3A and the bonnet 2B, and always biases the piston 3B and stem 3C downward.

The first valve portion 4 is provided on one end side of the body 2A, and includes a first diaphragm 4A, a first presser adapter 4B, and a first diaphragm presser 4C.

The first diaphragm 4A is held at its outer periphery by being pinched by a first presser adapter 4B and the body 2A, which are arranged under the bonnet 2B. The first diaphragm 4A separates from and contacts (pressures) the first sheet 2J, thereby opening and closing the fluid passage.

The first diaphragm presser 4C is provided above the first diaphragm 4A, and is configured to be able to press the center portion of the first diaphragm 4A. The first diaphragm presser 4C is supported by a first presser adapter 4B so as to be movable in the vertical direction.

The second valve part 5 is provided on the other end side of the body 2A, and includes a second diaphragm 5A, a second presser adapter 5B, a fixing member 5C, a fixing nut 5D, a second diaphragm presser 5E, and a holder 5F. , is provided.

The second diaphragm 5A is held by the second presser adapter 5B and the body 2A, which are arranged above the fixing member 5C, with the outer peripheral edge thereof being pressed. The fluid passage is opened and closed by the second diaphragm 5A separating from and coming into contact (pressure contact) with the second sheet 2K.

The fixing member 5C has a substantially cylindrical shape with a through hole 5g, and its upper portion is inserted into the lower opening of the body 2A. The fixing member 5C has a first protrusion 5H on the lower side that protrudes outward.

The fixing nut 5D has a substantially cylindrical shape and has a second protrusion 5J that protrudes inward at the lower end. The fixing nut 5D is fixed to the body 2A by screwing a female threaded portion provided on its inner periphery to a male threaded portion provided on the outer periphery of the lower end of the body 2A. The second protrusion 5J of the fixing nut 5D abuts the first protrusion 5H of the fixing member 5C from below, and the fixing member 5C is pressed upward. As a result, the second presser adapter 5B is also pushed upward, and the outer peripheral edge of the second diaphragm 5A is compressed.

The second diaphragm presser 5E is provided below the second diaphragm 5A, and is configured to be able to press the center portion of the second diaphragm 5A. The second diaphragm presser 5E is fitted into the holder 5F.

The holder 5F has a substantially cylindrical shape and is disposed within the fixing member 5C so as to be vertically movable. The holder 5F has a second diaphragm presser 5E fitted at one end, and a spherical portion 5K at the other end.

The switching arm 6 is approximately U-shaped and includes a pair of arm portions 6A and a connecting portion 6B. Each arm portion 6A extends along the vertical direction, one end is connected to the outer peripheral edge of the piston 3B, and the other end extends to a position beyond the second valve portion 5. Each arm portion 6A passes through each arm insertion hole 2m of the bonnet 2B, and is supported by the bonnet 2B in vertical movement. The connecting portion 6B connects the other ends of each arm portion 6A. A disk-shaped pressing portion 6C is provided at the center of the connecting portion 6B. The upper end portion of the pressing portion 6C is inserted into the through hole 5g of the fixing member 5C, and is in contact with the holder 5F from below. The surface of the pressing portion 6C that comes into contact with the spherical portion 5K forms a plane 6D that is perpendicular to the vertical direction.

The switching arm 6 is located outside the body 2A. Since the switching arm 6 is connected to the piston 3B, it moves up and down as the piston 3B moves up and down. Therefore, when the piston 3B is located at the bottom dead center, the pressing portion 6C is also located at the bottom dead center, and when the piston 3B is located at the top dead center, the pressing portion 6C is also located at the top dead center.

When the piston 3B and the pressing part 6C are at the bottom dead center, the stem 3C, the first diaphragm holder 4C, the holder 5F, and the second diaphragm holder 5E are at the bottom dead center, and the first diaphragm 4A is at the bottom dead center. 2J, and the second diaphragm 5A is separated from the second sheet 2K. Therefore, when the piston 3B and the pressing portion 6C are located at the bottom dead center, the first valve portion 4 is in a closed state. The second valve portion 5 is in an open state.

On the other hand, when the piston 3B and the pressing part 6C are located at the top dead center, the stem 3C, the first diaphragm holder 4C, the holder 5F, and the second diaphragm holder 5E are located at the top dead center, and the first diaphragm 4A is located at the top dead center. The second diaphragm 5A is separated from the first sheet 2J and comes into contact with the second sheet 2K. Therefore, when the piston 3B and the pressing part 6C are located at the top dead center, the first valve part 4 is in the open state and the second valve part 5 is in the closed state. In this embodiment, the plane including the entire switching arm 6 is orthogonal to the plane including the entire communication path 2e, inflow path 2f, first outflow path 2g, and second outflow path 2h.

The first to third joints 7 to 9 are connected to the outer peripheral surface of the body 2A, respectively. The interiors of the first to third joints 7 to 9 communicate with an inflow path 2f, a first outflow path 2g, and a second outflow path 2h, respectively. Each of the first to third joints 7 to 9 is composed of a stainless steel sleeve welded to the body 2A, a stainless steel union nut fitted onto the sleeve, and a pure ring interposed between these. ing. In this embodiment, the first joint 7 functions as a fluid inlet, and the second and third joints 8 and 9 function as fluid outlets.

Next, the operation of the switching valve 1 will be explained.

In the switching valve 1 of this embodiment, when the driving fluid is not flowing into the pressure chamber 3f, the piston 3B and the switching arm 6 are at the bottom dead center due to the biasing force of the compression coil spring 3D, and as described above, the switching arm 6 is at the bottom dead center. The lower surface of the first diaphragm 4A is pressed against the first seat 2J, and the first valve portion 4 is in the closed state, and the upper surface of the second diaphragm 5A is separated from the second seat 2K, and the second valve portion 5 is in the open state. It has become. Therefore, the fluid supplied to the switching valve 1 via the first joint 7 flows to the inflow path 2f, the communication path 2e, and the second outflow path 2h, passes through the second joint 8, and flows to the secondary side. flows to That is, in the switching valve 1, in a normal state (a state in which driving fluid is not supplied), the first valve part 4 is in a closed state and the second valve part 5 is in an open state.

On the other hand, by supplying the driving fluid to the switching valve 1 through an air tube and a pipe joint (not shown), the driving fluid flows into the pressure chamber 3f through the air introduction path 3g, and the piston 3B is activated by the compression coil spring. It rises against the 3D urging force. As a result, the piston 3B and the switching arm 6 move to the top dead center, and as described above, the lower surface of the first diaphragm 4A is separated from the first seat 2J, the first valve part 4 is in the open state, and the second diaphragm 4A is moved to the top dead center. The upper surface of 5A is pressed against the second seat 2K, and the second valve portion 5 is in a closed state. Therefore, the fluid supplied to the switching valve 1 via the first joint 7 flows to the inflow path 2f, the communication path 2e, and the first outflow path 2g, passes through the first joint 7, and goes to the secondary side. flows to In this manner, the fluid flow path is switched in the switching valve 1.

According to the switching valve 1 of the present embodiment described above, the body 2A is provided with the communication passage 2e, the inflow passage 2f, the first outflow passage 2g, and the second outflow passage 2h. , a first valve part 4 that opens and closes the inflow passage 2f, the communication passage 2e, and the first outflow passage 2g, and a second valve part 4 that is provided in the body 2A and opens and closes the inflow passage 2f, the communication passage 2e, and the second outflow passage 2h. The valve part 5, an actuator 3 that opens and closes the first valve part 4, and a switching arm 6 that is connected to the actuator 3 and operates in accordance with the operation of the actuator 3 to open and close the second valve part 5. The arm 6 is provided outside the body 2A.

According to this configuration, since the switching arm 6 is provided outside the body 2A, the switching arm 6 can be easily configured to be thick, and the switching arm 6 can be stably operated by the driving force of the actuator 3. Therefore, the stability of opening and closing of the second valve portion 5 can be improved. Moreover, the switching operation of the flow path in the switching valve 1 becomes visible from the outside.

The body 2A has a substantially cylindrical shape, the first valve part 4 is provided at one end of the body 2A, the second valve part 5 is provided at the other end of the body 2A, and the switching arm 6 is connected to the body 2A. It extends from one end to a position beyond the other end. In this way, even if the switching arm 6 extends from one end of the body 2A to a position exceeding the other end, the switching arm 6 can be made thicker, so the stability of opening and closing of the second valve part 5 can be improved. can be improved.

The switching arm 6 has a pair of arm parts 6A and a connecting part 6B, each arm part 6A extends along the axial direction of the body 2A, and one end of each arm part 6A is connected to the actuator 3. The other end of each arm portion 6A extends to a position beyond the second valve portion 5, and the connecting portion 6B extends along the radial direction of the body 2A and connects the other end of each arm portion 6A. Even in this configuration, since the pair of arm portions 6A and the connecting portion 6B can be configured to be thick, the stability of opening and closing of the second valve portion 5 can be improved.

The second valve part 5 has a second diaphragm 5A and a second diaphragm retainer 5E, and a disk-shaped pressing part 6C is provided in the radial center of the connecting part 6B, and the pressing part 6C is connected to the second diaphragm holder 5E. By pressing the presser foot 5E, the second diaphragm 5A blocks communication between the inflow path 2f and the communication path 2e and the second outflow path 2h. According to this configuration, the second diaphragm presser 5E can be stably pressed by the pressing portion 6C, and the stability of opening and closing of the second valve portion 5 can be improved.

The second valve part 5 has a holder 5F that is located on the opposite side of the second diaphragm holder 5E to the second diaphragm 5A side and holds the second diaphragm holder 5E, and the holder 5F has a second diaphragm holder 5F on one end side. Holding the presser foot 5E, the other end side forms a spherical part 5K, and the surface of the pressing part that comes into contact with the spherical part 5K forms a flat surface 6D. Therefore, the holder 5F and the switching arm 6 are separate bodies, and the inclination of the switching arm 6 can be absorbed by the spherical part 5K of the holder 5F coming into contact with the flat surface 6D of the pressing part 6C. Thereby, even if the first diaphragm 4A and the second diaphragm 5A are not parallel, the second diaphragm 5A can be pushed without being affected by the inclination of the switching arm 6.

Note that the present disclosure is not limited to the embodiments described above. Those skilled in the art can make various additions, changes, etc. within the scope of the present disclosure. For example, in one embodiment, the body 2A has a substantially cylindrical shape, but as long as it is substantially cylindrical, it may be a substantially cylindrical shape with a width across flats, or it may be a prismatic shape.

In the switching valve 1, in a normal state (a state in which driving fluid is not supplied), the first valve part 4 is in a closed state and the second valve part 5 is in an open state. The portion 4 may be in an open state, and the second valve portion 5 may be in a closed state. The switching arm 6 may be joined to the piston 3B by welding or the like, or may be connected to the piston 3B by a bolt or the like. In the switching valve 1, the inflow path 2f, the first outflow path 2g, and the second outflow path 2h may be such that the inflow path 2f is an outflow path, and the first outflow path 2g and the second outflow path 2h are inflow paths. A cover may be attached to the switching valve 1 so as to cover the body 2, the second valve portion 5, and the switching arm 6. The cover may be made of a transparent material so that the switching arm 6 can be visually recognized from the outside.

1: Switching valve 2A: Body 2e: Communication path 2f: Inflow path 2g: First outflow path 2h: Second outflow path 3: Actuator 4: First valve section 5: Second valve section 5A: Second diaphragm 5E: Second 2 diaphragm presser 5F: holder 6: switching arm 6A: arm portion 6B: connecting portion 6C: pressing portion 6D: flat surface

Claims (5)

A body in which a first flow path, a second flow path, and a third flow path are formed;
a first valve part that is provided in the body and opens and closes the first flow path and the second flow path;
a second valve part provided in the body and opening and closing the first flow path and the third flow path;
an actuator that opens and closes the first valve portion;
a switching arm that is connected to the actuator, operates in accordance with the operation of the actuator, and opens and closes the second valve portion;
The switching arm is a switching valve provided outside the body. The body has a substantially columnar shape,
The first valve portion is provided on one end side of the body,
The second valve portion is provided on the other end side of the body,
The switching valve according to claim 1, wherein the switching arm extends from one end of the body to a position beyond the other end. The switching arm has a pair of arm parts and a connecting part,
Each arm extends along the axial direction of the first flow path,
One end of each arm portion is connected to the actuator, the other end of each arm portion extends to a position beyond the second valve portion,
The switching valve according to claim 2, wherein the connecting portion extends along the radial direction of the first flow path and connects the other ends of each arm portion. The second valve portion has a diaphragm and a diaphragm retainer,
A disk-shaped pressing portion is provided in the radial center portion of the connecting portion,
The switching valve according to claim 3, wherein the diaphragm blocks communication between the first flow path and the third flow path when the pressing portion presses the diaphragm retainer. The second valve portion has a holder located on the opposite side of the diaphragm holder to the diaphragm side and holds the diaphragm holder,
The holder holds the diaphragm presser at one end thereof, and has a spherical portion at the other end,
The switching valve according to claim 4, wherein a surface of the pressing portion that comes into contact with the spherical portion is a flat surface.

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