JP2021032329A - Valve device - Google Patents

Abstract

To provide a valve device which is unlikely to bite in an object to circulate between a valve body and sheet member.SOLUTION: A valve device includes: a valve body having a through communication passage; a housing which has a valve body housing chamber housing the valve body rotatably between an open position that allows passage of the object to circulate in a communication passage and a closed position blocking passage of the object to circulate in the communication passage and has at least two flow paths communicating with each other via the communication passage when the valve body is at the open position; an annular sheet member arranged around an opening end of the flow passages in the housing in the state that it is pressure-welded to the valve body; and a fluid jet part having a jet hole that can jet fluid supplied from outside to the valve body storing chamber. The jet hole is arranged at a position facing an area which the outer surface of the valve body enters into the sheet member side when the valve body rotates from the open position to the closed position at a boundary between the valve body and the sheet member.SELECTED DRAWING: Figure 5

Description

The present invention relates to a valve device including a valve body and a housing that rotatably accommodates the valve body around a predetermined axis.

Conventionally, a valve device including a valve body and a housing in which the valve body is rotatably housed around a predetermined axis is known (see Patent Document 1). Specifically, as shown in FIG. 14, this valve device rotatably accommodates a valve body 502 having a penetrating communication hole 501 and the valve body 502 around a predetermined rotation axis Ax, and also serves as a valve. A housing 505 having two flow passages 503 and 504 that can communicate with each other through a communication hole 501 of the body 502, and an annular seat member 506 arranged around an opening end on the inner side of one of the flow passages 503 in the housing 505. And have. The seat member 506 is pressure-welded to the valve body 502 to ensure a tight seal between the flow passage 503 and the valve body 502. In the valve device 500, the valve body 502 rotates around the rotation shaft Ax to open and close the valve device 500.

Japanese Unexamined Patent Publication No. 2008-95811

When the above valve device 500 is used as a movement shutoff valve for powder or granular material, when the valve body 502 is rotated to close the valve device 500, the powder or granular material attached to the surface of the valve body 502 ( The object to be distributed) may be caught between the valve body 502 and the seat member 506. When such biting occurs, the airtightness between the valve body 502 and the flow passage 503 is lowered, and the surface of the valve body 502 and the surface of the seat member 506 are damaged.

Therefore, an object of the present invention is to provide a valve device that suppresses the biting of a distribution object between a valve body and a seat member.

The valve device according to the present invention is
A valve body with a penetrating passage and
A valve body accommodating chamber that rotatably accommodates the valve body between an open position that allows the passage of the distribution object to pass through the communication passage and a closed position that prevents the passage of the distribution object from passing through the communication passage, and the valve body accommodating chamber. A housing having at least two flow passages communicating with each other through the communication passage when the valve body is in the open position.
An annular seat member arranged around the open end of the flow passage in the housing while being pressure-contacted with the valve body.
A fluid injection unit having an injection hole capable of injecting a fluid supplied from the outside into the valve body accommodating chamber is provided.
The injection hole is arranged at a position facing a region where the outer surface of the valve body enters the seat member side when the valve body rotates from the open position to the closed position at the boundary between the valve body and the seat member. Has been done.

According to such a configuration, when the valve body is rotated from the open position to the closed position, a fluid (for example, nitrogen gas or air) is supplied to the fluid injection portion from the outside to obtain the valve body on the outer surface of the valve body. It is possible to blow off the flowable object adhering to the vicinity of the boundary with the seat member, whereby the bite of the flowable object between the valve body and the seat member can be effectively suppressed.

In the valve device,
The injection hole may extend along the boundary.

According to such a configuration, the distribution object adhering to the outer surface of the valve body can be blown off in a wide range along the boundary between the valve body and the seat member, so that the distribution object between the valve body and the seat member can be blown away. It is possible to suppress the biting of the body more effectively.

in this case,
The fluid injection portion has a fluid pool portion in the middle of the flow path of the fluid.
It is preferable that the fluid pool portion communicates with the injection hole and has a throttle portion extending along the injection hole and having a smaller flow path cross-sectional area than the region on the immediately upstream side.

In this way, by providing the throttle portion extending along the injection hole at the position communicating with the injection hole, the differential pressure generated between the upstream side and the downstream side of the throttle portion causes each position (injection) of the injection hole. The deviation of the flow rate of the fluid injected from each position in the extending direction of the hole) is suppressed.

In addition, the valve device
An annular member adjacent to the seat member is provided on the valve body side of the seat member in the opening direction of the flow passage.
The injection hole may be formed by a gap between the sheet member and the annular member.

According to such a configuration, since the fluid is injected along the seat member, the fluid is more reliably injected toward the boundary between the valve body and the seat member, whereby the fluid adheres to the vicinity of the boundary on the outer surface of the valve body. It is possible to more reliably blow off the distribution target part that is being used.

From the above, according to the present invention, it is possible to provide a valve device in which it is difficult for a distribution object to be caught between a valve body and a seat member.

FIG. 1 is a perspective view of the valve device according to the present embodiment. FIG. 2 is an exploded perspective view of the valve device. FIG. 3 is a side view of the valve device. FIG. 4 is a central vertical sectional view of the valve device. FIG. 5 is a cross-sectional view taken along the line VV of FIG. 3 in a state where the valve body is in the open position. FIG. 6 is a cross-sectional view taken at the VV position of FIG. 3 in a state where the valve body is in the closed position. FIG. 7 is a central vertical sectional view of the seat member. FIG. 8 is a partial cross-sectional view of the annular member. FIG. 9 is an enlarged view of the range shown by IV in FIG. FIG. 10 is a diagram showing a range in which a fluid is injected by a fluid injection portion on the outer surface of the valve body. FIG. 11 is a perspective view of the valve device according to another embodiment. FIG. 12 is a side view of the valve device. FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. FIG. 14 is a central vertical sectional view of a conventional valve device.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 10.

The valve device according to the present embodiment is arranged on a flow path through which a distribution object is circulated, and opens (opens) and closes (blocks) the flow path. Specifically, the valve device of the present embodiment is a so-called two-way valve, and is arranged between the pipes constituting the flow path. Then, this valve device switches between a state of allowing the passage of the distribution object (open state) and a state of blocking the passage (closed state) between the pipes. The distribution target is appropriately selected according to the equipment or plant in which the flow path is installed. The distribution object of the present embodiment is, for example, a powder or granular material.

As shown in FIGS. 1 to 6, the valve device of the present embodiment includes a valve body 2 having a communication passage R1 penetrating in a direction orthogonal to the rotation axis Ax extending in a predetermined direction (vertical direction in FIG. 1) and a valve. A housing 3 having a valve body accommodating chamber 30 accommodating the body 2 and two flow passages (first flow passage R2, second flow passage R3) communicating with the valve body accommodating chamber 30, and a first flow passage R2 in the housing 3. An annular seat member 4 arranged around the opening and a fluid injection section 5 having an injection hole 54 capable of injecting a fluid f supplied from the outside into the valve body accommodating chamber 30 are provided. Further, the valve device 1 of the present embodiment includes an annular member 6 adjacent to the seat member 4 on the valve body 2 side of the seat member 4 in the center line C2 direction (left-right direction in FIG. 4) of the first flow passage R2. Further, the valve device 1 of the present embodiment has a stem 7 extending from the valve body 2 so as to pass through the rotation shaft Ax, and a trunnion extending from a position on the valve body 2 opposite to the stem 7 so as to pass through the rotation shaft Ax. 8 and. In the following, the center line C2 direction of the first flow passage R2 is the X-axis direction, the extension direction of the rotation axis Ax is the Z-axis direction, and the X-axis direction and the direction orthogonal to the Z-axis direction are the Y-axis directions. ..

The valve body 2 can rotate about the rotation shaft Ax in a state of being in pressure contact with the seat member 4. The valve body 2 is substantially spherical and has a continuous passage R1 that penetrates straight through the center of the valve body 2. The communication passage R1 of the present embodiment has a circular cross section and extends in a direction orthogonal to the rotation axis Ax.

The housing 3 has a valve body accommodating chamber 30 that rotatably accommodates the valve body 2 between at least the open position P1 (see FIG. 5) and the closed position P2 (see FIG. 6), and the valve body 2 is in the open position P1. At this time, it has two flow passages (first flow passage R2 and second flow passage R3) that are electrically connected to each other through the communication passage R1 of the valve body 2. These two flow passages R2 and R3 face each other with the valve body accommodating chamber 30 in between. That is, the first flow passage R2 and the second flow passage R3 are separated from each other from the opposite positions of the valve body accommodating chamber 30 so that the center lines C2 and C3 coincide with each other (in the present embodiment, the X-axis direction). It extends straight to one side (left side in FIG. 4) and the other side (right side in FIG. 4). The inner diameter of each of the first flow passage R2 and the second flow passage R3 is the same as the inner diameter of the communication passage R1 (see FIG. 4).

In the valve device 1 of the present embodiment, the open position P1 of the valve body 2 means that the center line C1 of the communication passage R1 coincides with the center line C2 of the first flow passage R2 and the center line C3 of the second flow passage R3. This is the position of the valve body 2 in the closed state. At this time, the center lines C1, C2, and C3 coincide with the center line C of the flow passage of the valve device 1 (the first flow passage R2, the communication passage R1, and the second flow passage R3 are connected) (see FIG. 5). .. Further, the closed position P2 of the valve body 2 means that the center line C1 of the communication passage R1 is 90 around the rotation axis Ax with respect to the center line C2 of the first flow passage R2 and the center line C3 of the second flow passage R3. This is the position of the valve body 2 in the rotated state (see FIG. 6).

Specifically, the housing 3 has a main frame 31 and a subframe 32 attached to the main frame 31.

The main frame 31 includes a main frame main body 311 that defines a part of a valve body accommodating chamber 30 that accommodates the valve body 2, a stem insertion portion 312 through which the stem 7 is inserted, and a trunnion insertion portion 313 into which the trunnion 8 is inserted. And a pipe connecting portion 314 that defines the second flow passage R3.

The main frame main body 311 has an opening 3111 having a size through which the valve body 2 can pass, and has an accommodating recess 3112 internally for accommodating the valve body 2 in a non-contact state. The opening 3111 of the main frame main body 311 is formed in a substantially circular shape around a center line C orthogonal to the rotation axis Ax of the valve body 2 and extending in the X-axis direction at a substantially center of the valve body accommodating chamber 30. ..

The stem insertion portion 312 has a stem insertion hole H1 that communicates the inside and the outside of the accommodating recess 3112 through the rotation shaft Ax of the valve body 2 and allows the stem 7 to be inserted. A plurality of gaskets are arranged in the stem insertion hole H1 and between the stem 7 and the stem insertion portion 312 (housing 3) while allowing rotation (rotation) of the stem 7 around the rotation shaft Ax. The sealing property of is secured.

The trunnion insertion portion 313 is provided at a position opposite to the stem insertion portion 312 with the valve body accommodating chamber 30 interposed therebetween. The trunnion insertion portion 313 has a trunnion insertion hole H2 extending from the inside of the accommodating recess 3112 through the rotation shaft Ax of the valve body 2 and into which the trunnion 8 is inserted. The trunnion insertion portion 313 does not communicate with the outside. A plurality of gaskets are also arranged in the trunnion insertion hole H2, and while allowing rotation (rotation) of the trunnion 8 around the rotation shaft Ax, between the trunnion 8 and the trunnion insertion portion 313 (housing 3). The sealing property of is secured.

The pipe connection portion 314 is a tubular portion. The inner peripheral surface 314a of the pipe connecting portion 314 constitutes the second flow passage R3. The second flow passage R3 extends in the X-axis direction and communicates between the inside and the outside of the accommodating recess 3112. Specifically, the pipe connection portion 314 is connected to the main frame main body 311 so that the center line C3 of the second flow passage R3 is orthogonal to the rotation axis Ax and coincides with the center line C of the opening 3111 of the accommodating recess 3112. Has been done. The pipe connection portion 314 has a flange 3140 at the outer end portion (the other end portion in the X-axis direction) to which another pipe can be connected.

By attaching the subframe 32 to the main frame 31, the valve body accommodating chamber 30 is defined inside in cooperation with the main frame 31. The subframe 32 includes a connection flange 321 connected to the peripheral edge of the opening 3111 in the mainframe main body 311 and a pipe connection portion 322 that defines a part of the first flow passage R2. Further, the subframe 32 has a fluid inflow portion 51 that allows a fluid f supplied from the outside to flow into the valve body accommodating chamber 30.

The pipe connection portion 322 is a tubular portion. The inner peripheral surface 322a of the pipe connecting portion 322 communicates the valve body accommodating chamber 30 with the outside. Specifically, the inner peripheral surface 322a includes a flow path constituent portion 3221a forming a part of the first flow passage R2, and an accommodating portion 3222a accommodating the seat member 4 and the annular member 6. The accommodating portion 3222a is a portion adjacent to the other side of the flow path constituent portion 3221a in the X-axis direction and having a diameter expanded from that of the flow path constituent portion 3221a. That is, the accommodating portion 3222a is a concave portion (diameter-expanded portion) provided at a position surrounding the first flow passage R2 on the inner peripheral surface 322a and recessed outward in the radial direction. The accommodating portion 3222a has a shape corresponding to the seat member 4 and the annular member 6. Further, the pipe connecting portion 322 has a flange 3220 to which another pipe can be connected at one end in the X-axis direction.

The fluid inflow portion 51 is a tubular portion that protrudes from the outer surface of the subframe 32. The fluid inflow unit 51 of the present embodiment constitutes a part of the fluid injection unit 5, and the specific configuration will be described in detail in the description of the fluid injection unit 5.

As shown in FIG. 7, the seat member 4 has an annular seat member main body 41 that is in pressure contact with the valve body 2 and a short cylinder portion 42 that extends from the seat member main body 41. The sheet member 4 of the present embodiment is made of metal (mainly stainless steel), fluororesin (PTFE), engineering plastic (PEEK), or the like. When fluororesin or engineering plastic is used for the sheet member 4, the portion that comes into pressure contact with the valve body 2 (the portion including the pressure contact surface 412 described later) is formed of fluororesin or engineering plastic, and the other portions are metal. Formed by. When the sheet member 4 is made of metal, the sheet member 4 is hardened (sprayed, welded meat) so that the valve body 2 and the sheet member 4 have a hardness difference in order to prevent seizure (so-called galling). Saturation, plating, nitriding, etc.) are applied.

Specifically, the seat member main body 41 has an annular shape centered on the center line C, and has an annular member side end surface 411 that extends in a plane direction orthogonal to the X-axis direction at the other end in the X-axis direction, and the annular member side. It has a pressure contact surface 412 extending in a direction (inclination direction) located on one side in the X-axis direction from the inner peripheral edge of the end surface 411 toward the center line C. Further, the seat member main body 41 is configured by reducing the diameter of the inner peripheral surface 413 of the main body forming a part of the first flow passage R2 and the other end portion of the outer peripheral surface 414 of the seat member main body 41 in the X-axis direction. It has a recess 415 and a recess 415.

The pressure contact surface 412 is in contact with the opening peripheral edge of the communication passage R1 on the outer surface 2a of the valve body 2 when the valve body 2 is in the open position P1, and when the valve body 2 rotates from the open position P1 to the closed position P2. It is in sliding contact with the outer surface 2a of the valve body 2 (it is in sliding contact with the area indicated by the dots in FIG. 10).

The recess 415 is provided in the entire circumferential direction of the seat member main body 41, and constitutes the fluid pool portion 52 in cooperation with the accommodating portion 3222a and the annular member 6 of the pipe connecting portion 322. The fluid reservoir 52 of the present embodiment constitutes a part of the fluid injection unit 5, and the specific configuration will be described in detail in the description of the fluid injection unit 5.

The outer peripheral surface 414 is a surface along the accommodating portion 3222a of the pipe connecting portion 322, and has a groove 414a extending in the circumferential direction (see FIG. 9). An O-ring O1 is arranged (press-fitted) in the groove 414a, and the O-ring O1 is pressed against the accommodating portion 3222a (inner peripheral surface 322a) of the pipe connecting portion 322.

The short tubular portion 42 is a tubular portion extending from the inner peripheral side end portion of the end surface 416 on one side in the X-axis direction of the seat member main body 41 toward one side in the X-axis direction. The short cylinder portion 42 has an inner peripheral surface 421 of the short cylinder portion that forms a part of the first flow passage R2. The inner peripheral surface 421 of the short cylinder portion has the same diameter as the inner peripheral surface 413 of the main body (that is, is connected in the X-axis direction), and constitutes the inner peripheral surface 43 of the seat member 4 together with the inner peripheral surface 413 of the main body. The inner peripheral surface 43 of the sheet member 4 has the same diameter as the flow path constituent portion 3221a on the inner peripheral surface 322a of the pipe connecting portion 322, and is connected to the flow path constituent portion 3221a in the X-axis direction to form a first flow passage. It constitutes R2. That is, the first flow passage R2 is defined by the pipe connecting portion 322 and the seat member 4. The center line C2 of the first flow passage R2 is orthogonal to the rotation axis Ax and coincides with the center line C of the opening 3111 of the accommodating recess 3112.

As shown in FIGS. 2, 4 to 6, and 8, the annular member 6 is an annular member centered on the center line C2. Specifically, the annular member 6 is orthogonal to the seat member side end surface 61 extending in the plane direction orthogonal to the X-axis direction at one end in the X-axis direction and orthogonal to the X-axis direction at the other end in the X-axis direction. A valve body side end surface 62 extending in the surface direction, an outer peripheral surface 63 connecting the outer peripheral edge of the seat member side end surface 61 and the outer peripheral edge of the valve body side end surface 62, and extending from the inner peripheral edge of the valve body side end surface 62 toward the center line C. It has an inclined inner peripheral surface 64 that approaches the end surface 61 on the side of the seat member.

The seat member side end surface 61 has a recess 611 in which a part in the circumferential direction is recessed on the other side in the X-axis direction. In the annular member 6 of the present embodiment, the recess 611 is arranged on one side in the Y-axis direction (right side in FIG. 8), and the circumferential range of the recess 611 is the size of the communication passage R1 in the Z-axis direction. The range corresponding to the diameter) (the range indicated by the dots in FIG. 10). In other words, the recess 611 is formed in a range corresponding to the injection hole 54. The thickness of the recess 611 at each position is constant.

The outer peripheral surface 63 is a surface along the accommodating portion 3222a of the pipe connecting portion 322, and has a groove 63a extending in the circumferential direction (see FIG. 9). An O-ring O2 is arranged (press-fitted) in the groove 63a, and the O-ring O2 is in pressure contact with the accommodating portion 3222a (inner peripheral surface 322a) of the pipe connecting portion 322.

The annular member 6 is fixed to the seat member 4 in a state where the seat member side end surface 61 is in contact with the annular member side end surface 411 of the seat member 4, so that the recess 611 and the annular member are fixed as shown in FIG. A gap (connection flow path) 53 is formed between the side end surface 411 and the side end surface 411. The gap 53 communicates with the fluid pool portion 52 and opens on the center line C side. This opening constitutes the injection hole 54 of the fluid injection unit 5.

The fluid injection unit 5 injects the fluid f supplied from the outside onto the outer surface 2a of the valve body 2 to blow off the distribution object (powder or granular material in the example of the present embodiment) adhering to the outer surface 2a. Specifically, the fluid injection unit 5 is discharged from the fluid inflow unit 51 into which the fluid f supplied from the outside flows in, the fluid reservoir 52 in which the fluid f flowing in from the fluid inflow unit 51 flows in, and the fluid reservoir 52. It has a connecting flow path 53 through which the fluid f flows, and an injection hole 54 for injecting the fluid f flowing through the connecting flow path 53 toward the valve body 2.

The fluid inflow portion 51 is a tubular portion having a hollow portion 51a communicating with the outside and the accommodating portion 323 (see FIGS. 5 and 6), and another pipe is connected to supply the fluid f through the pipe. .. The fluid inflow portion 51 of the present embodiment is provided in the housing 3 (specifically, the subframe 32).

The fluid pool portion 52 is arranged in the fluid injection portion 5 in the middle of the flow path of the fluid f from the fluid inflow portion 51 to the injection hole 54. The fluid pool portion 52 communicates with the injection hole 54 through the connection flow path 53. Further, the fluid pool portion 52 has a throttle portion 521 having a flow path cross-sectional area smaller than that of the region immediately upstream at the boundary position with the connection flow path 53. The throttle portion 521 extends in an arc direction (circumferential direction of the fluid pool portion 52) about the center line C.

The fluid pool portion 52 of the present embodiment is composed of an inner peripheral surface 322a (accommodation portion 3222a) of the pipe connecting portion 322, a recess 415 of the seat member main body 41, and a seat member side end surface 61 of the annular member 6. There is. Therefore, the fluid pool portion 52 extends in an annular shape along the inner peripheral surface 322a (accommodation portion 3222a) of the pipe connecting portion 322. The fluid pool portion 52 also communicates with the hollow portion 51a of the fluid inflow portion 51.

Further, the throttle portion 521 is composed of a recess 611 of the seat member side end surface 61 of the annular member 6 and a recess 415 of the seat member 4. More specifically, the throttle portion 521 is a slit-shaped opening surrounded by a boundary portion (corner portion) between the recess 415 of the sheet member 4 and the end surface 411 on the annular member side and the recess 611 of the annular member 6. .. The throttle portion 521 extends along the circumferential direction of the seat member 4 at a position (range) corresponding to the recess 611 of the annular member 6. That is, the opening width of the throttle portion 521 corresponds to the amount of the recess of the recess 611, and the length of the throttle portion 521 corresponds to the length of the recess 611 in the circumferential direction.

The connection flow path 53 is composed of an annular member side end surface 411 of the sheet member 4 and a recess 611 of the annular member 6. The opening on the valve body 2 side of the connection flow path 53 constitutes the injection hole 54, and the opening on the fluid inflow portion 51 side constitutes the throttle portion 521. That is, each of the injection hole 54 and the throttle portion 521 of the present embodiment is formed by a gap between the seat member 4 and the annular member 6.

In the injection hole 54, when the valve body 2 rotates from the open position P1 to the closed position P2 at the boundary B between the valve body 2 and the seat member 4 (pressure contact surface 412), the outer surface 2a of the valve body 2 becomes the seat member 4 It is arranged at a position facing the area entering the (pressure contact surface 412) side. The injection hole 54 extends along the boundary B. The length of the injection hole 54 of the present embodiment corresponds to the length in the circumferential direction of the recess 611 of the annular member 6.

Returning to FIGS. 1 to 4, the stem 7 inserts the housing 3 (stem insertion portion 312) and transmits the rotational force around the rotation shaft Ax to the valve body 2 to the valve body 2. Specifically, the stem 7 is a shaft member extending in the Z-axis direction, and is inserted through the stem insertion portion 312. A valve body 2 is connected to one end (lower end in FIG. 4) of the stem 7 in the Z-axis direction. The stem 7 can be manually rotated by attaching a handle or the like, but in the valve device 1 of the present embodiment, a drive motor such as a pulse motor in which the rotation angle of the stem 7 can be arbitrarily set (not shown). (Not) is connected to the other end in the Z-axis direction, and the drive motor rotates the valve body 2 around the rotation axis Ax.

The trunnion 8 supports the valve body 2 in the valve body accommodating chamber 30 in a state in which the valve body 2 is rotatably around the rotation shaft Ax in a non-contact state with the housing 3 in cooperation with the stem 7. Specifically, the trunnion 8 is a shaft member extending in the Z-axis direction, and is inserted into the trunnion insertion portion 313. A valve body 2 is connected to the other end portion (upper end portion in FIG. 4) of the trunnion 8 in the Z-axis direction.

In the valve device 1 configured as described above, the valve body 2 is rotated around the rotation shaft Ax between the open position P1 and the closed position P2 via the stem 7 by the drive motor, thereby causing the valve device 1. The open state and the closed state of 1 are switched.

Specifically, when the valve device 1 is switched from the open state to the closed state, the valve body 2 is rotated from the open position P1 to the closed position P2, and the fluid f (the present implementation) is applied to the fluid inflow portion 51 of the fluid injection portion 5. In the example of the form, nitrogen gas or air) is supplied. The supplied fluid f flows into the fluid pool portion 52 and then flows out to the connecting flow path 53 through the throttle portion 521. Then, the fluid f flowing through the connection flow path 53 is injected from the injection hole 54 toward the boundary B between the pressure contact surface 412 of the seat member 4 and the outer surface 2a of the valve body 2.

Since a part of the connection flow path 53 and the injection hole 54 is composed of the annular member side end surface 411 of the sheet member 4, the fluid f injected from the injection hole 54 is bounded along the annular member side end surface 411. Head to B. Then, the fluid f that has reached the boundary B flows along the outer surface 2a of the valve body 2 between the outer surface 2a and the inclined inner peripheral surface 64 of the annular member 6 toward the second flow passage R3. At this time, the distribution object (powder and granular material) adhering to the boundary B of the outer surface 2a of the valve body 2 and its vicinity is blown off, whereby the valve body 2 rotates and the outer surface 2a moves from the boundary B to the sheet. It is possible to prevent the object to be distributed from being caught between the seat member 4 (pressure contact surface 412) and the valve body 2 (outer surface 2a) when entering the member 4 side. At this time, the range in which the fluid f is injected on the outer surface 2a of the valve body 2 is at least the range indicated by the dots in FIG.

Further, in the valve device 1, the supplied fluid f reaches the boundary B from the injection hole 54 along the annular member side end surface 411, and the outer surface 2a of the valve body 2 and the inclined inner circumference of the annular member 6 are reached from the boundary B. A path (flow path: see arrow in FIG. 9) that flows through the surface 64, that is, the fluid f flows in one direction is configured. Therefore, the fluid f injected from the injection hole 54 flows smoothly, whereby the distribution object adhering to the outer surface 2a of the valve body 2 is effectively removed.

When the valve device 1 is switched from the closed state to the open state, the fluid f is not supplied to the fluid injection unit 5.

According to the above valve device 1, when the valve body 2 is rotated from the open position P1 to the closed position P2, a fluid (for example, nitrogen gas, air, etc.) is supplied to the fluid injection unit 5 from the outside. The flow object adhering to the vicinity of the boundary B between the valve body 2 and the seat member 4 on the outer surface of the valve body 2 is blown away. As a result, in the valve device 1, the biting of the distribution object between the valve body 2 and the seat member 4 is effectively suppressed.

Further, in the valve device 1 of the present embodiment, the injection hole 54 of the fluid injection unit 5 extends along the boundary B between the valve body 2 and the seat member 4. Therefore, the distribution object adhering to the outer surface 2a of the valve body 2 can be blown off in a wide range along the boundary B, whereby the valve body 2 is rotated from the open position P1 to the closed position P2. The biting of the distribution object between the valve body 2 and the seat member 4 can be suppressed more effectively.

Further, in the valve device 1 of the present embodiment, the fluid injection section 5 has a fluid pool section 52 in the middle of the flow path of the fluid f. Further, the fluid pool portion 52 communicates with the injection hole 54 and has a throttle portion 521 extending along the injection hole 54 and having a smaller flow path cross-sectional area than the region on the immediately upstream side. In this way, by providing the throttle portion 521 extending along the injection hole 54 at a position communicating with the injection hole 54, the injection hole 54 is formed by the differential pressure generated between the upstream side and the downstream side of the throttle portion 521. The deviation of the flow rate of the fluid injected from each position (each position in the extending direction of the injection hole 54) is suppressed.

Further, in the valve device 1 of the present embodiment, the injection hole 54 is formed by the gap between the seat member 4 and the annular member 6. As a result, the fluid f is injected along the seat member 4 (specifically, the annular member side end surface 411), so that the fluid f is more reliably injected toward the boundary between the valve body 2 and the seat member 4. As a result, the distribution target portion adhering to the vicinity of the boundary on the outer surface 2a of the valve body 2 can be more reliably blown off.

The valve device of the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, some of the configurations of certain embodiments can be deleted.

In the valve device 1 of the above embodiment, the injection hole 54 of the fluid injection unit 5 extends along the boundary B between the seat member 4 and the valve body 2, but is not limited to this configuration. The injection hole 54 may be configured not to extend along the boundary B. For example, as shown in FIGS. 11 to 13, the fluid injection portion 5A is composed of only the fluid inflow portion 51, and the end opening (circular opening) on the inner side of the housing 3 in the hollow portion 51a of the fluid inflow portion 51 is provided. The injection hole 54A may be configured. Even with such a configuration, when the injection hole 54A rotates from the open position P1 to the closed position P2 at the boundary B between the valve body 2 and the seat member 4, the outer surface 2a of the valve body 2 becomes the seat member. By arranging the valve body 2 at a position facing the region entering the 4 side, if the fluid f is supplied to the fluid injection portion 5A when the valve body 2 is rotated from the open position P1 to the closed position P2, the outer surface 2a of the valve body 2 It is possible to blow off the distribution object adhering to the vicinity of the boundary B in.

In the case of this configuration, it is preferable to arrange a plurality of fluid injection portions 5A along the boundary B and at intervals in the extending direction of the boundary (four in the example shown in FIG. 11). According to such a configuration, the fluid f can be injected into a wide range (a wide range in the circumferential direction) near the boundary B between the valve body 2 and the seat member 4, whereby the fluid f adheres to the outer surface 2a of the valve body 2. It is possible to blow off the distribution object more effectively.

Further, in the injection hole 54 of the above embodiment, the fluid is injected into the range corresponding to the position of the communication passage R1 on the outer surface 2a of the valve body 2 (the range indicated by the dots in FIG. 10), but the present invention is not limited to this configuration. .. The injection hole 54 may be configured to inject the fluid f into a wide range in the direction in which the boundary B extends from the above range, or may be configured to inject the fluid f into a range narrower in the circumferential direction than the above range.

Further, the fluid injection unit 5 of the above embodiment has a fluid reservoir 52, but the configuration is not limited to this. The fluid injection unit 5 may not have the fluid reservoir 52. In this case, the injection hole extends along the boundary B (circumferential direction of the communication passage R1) by adjusting the opening area of the injection hole 54, the size of the hollow portion 51a of the fluid inflow portion 51, the number of the fluid inflow portions 51, and the like. It is possible to suppress the bias of the injection amount of the fluid f at each position of 54 (that is, to make it uniform).

Further, the fluid pool portion 52 of the above embodiment is formed in an annular shape surrounding the communication passage R1, but is not limited to this configuration. If the fluid pool portion 52 has at least the same length as the injection hole 54 in the circumferential direction, the effect of suppressing the deviation of the injection amount of the fluid f at each position of the injection hole 54 extending along the boundary B can be obtained. Be done.

The fluid supplied to the fluid injection unit 5 is not limited. Nitrogen gas or air is supplied to the fluid injection unit 5 of the above embodiment as a barge gas for blowing off the powder or granular material (distribution object) adhering to the outer surface 2a of the valve body 2, but the process gas is used as the purge gas. May be done. Further, for example, a liquid such as a solvent may be supplied to the fluid injection unit 5 in order to dissolve a distribution object such as a resin fixed to the outer surface 2a of the valve body 2 or a component contained in the distribution object. ..

Further, the valve device 1 of the above embodiment has a two-way valve, that is, a housing 3 having two flow passages R2 and R3, but is not limited to this configuration. The valve device 1 may have a configuration in which the housing 3 has three or more flow passages, such as a three-way valve. In this case, a plurality of open positions (positions around the rotation axis Ax) of the valve body 2 are set, for example, a first open position, a second open position, and so on.

Further, the valve device 1 of the above embodiment has a configuration in which one seat member 4 is arranged, but the configuration is not limited to this configuration. The seat member 4 may be arranged in each flow passage provided in the housing 3. For example, in the case of a two-way valve, the seat member 4 is arranged at each of the inner end of the housing 3 in the first flow passage R2 and the inner end of the housing 3 in the second flow passage R3. There may be.

In this case, the fluid injection unit 5 may be arranged only on one of the flow passages R2 or R3 side, or may be arranged on each of the first flow passage R2 side and the second flow passage R3 side.

The valve device 1 of the above embodiment is a so-called contact type, but is not limited to this configuration. The valve device 1 may be a so-called non-contact type.

1 ... Valve device, 2 ... Valve body, 2a ... Outer surface of valve body, 3 ... Housing, 30 ... Valve body storage chamber, 31 ... Main frame, 311 ... Main frame body, 3111 ... Opening, 3112 ... Storage recess, 312 ... Stem insertion part, 313 ... Tranion insertion part, 314 ... Pipe connection part, 314a ... Inner peripheral surface, 3140 ... Flange, 32 ... Subframe, 321 ... Connection flange, 322 ... Pipe connection part, 322a ... Inner peripheral surface, 3220 ... Flange, 3221a ... Flow path constituent part, 3222a ... Accommodating part, 323 ... Accommodating part, 4 ... Seat member, 41 ... Seat member main body, 411 ... Circular member side end surface, 412 ... 414 ... Outer peripheral surface, 415 ... Recessed portion, 416 ... End surface, 42 ... Short cylinder portion, 421 ... Short cylinder inner peripheral surface, 43 ... Inner peripheral surface of sheet member, 5 ... Fluid injection portion, 51 ... Fluid inflow portion, 51a ... Hollow part, 52 ... Fluid pool part, 53 ... Connection flow path, 54 ... Injection hole, 6 ... Circular member, 61 ... Seat member side end face, 611 ... Recessed part, 62 ... Valve body side end face, 63 ... Outer surface surface, 64 ... Inclined Inner peripheral surface, 7 ... stem, 8 ... tranion, 500 ... valve device, 501 ... communication hole, 502 ... valve body, 503 ... flow passage, 505 ... housing, 506 ... seat member, Ax ... rotating shaft, C, C1 , C2, C3 ... Center line, f ... Fluid, H1 ... Stem insertion hole, H2 ... Tranion insertion hole, O1, O2 ... O-ring, P1 ... Open position, P2 ... Closed position, R1 ... Continuous passage, R2 ... First flow Passage, R3 ... Second flow passage, α ... Region where the pressure contact surface is in pressure contact when the valve body is in the open position.

Claims (4)

A valve body with a penetrating passage and
A valve body accommodating chamber that rotatably accommodates the valve body between an open position that allows the passage of the distribution object to pass through the communication passage and a closed position that prevents the passage of the distribution object from passing through the communication passage, and the valve body accommodating chamber. A housing having at least two flow passages communicating with each other through the communication passage when the valve body is in the open position.
An annular seat member arranged around the open end of the flow passage in the housing while being pressure-contacted with the valve body.
A fluid injection unit having an injection hole capable of injecting a fluid supplied from the outside into the valve body accommodating chamber is provided.
The injection hole is arranged at a position facing a region where the outer surface of the valve body enters the seat member side when the valve body rotates from the open position to the closed position at the boundary between the valve body and the seat member. Being a valve device. The valve device according to claim 1, wherein the injection hole extends along the boundary. The fluid injection portion has a fluid pool portion in the middle of the flow path of the fluid.
The valve device according to claim 2, wherein the fluid pool portion communicates with the injection hole and has a throttle portion extending along the injection hole and having a smaller flow path cross-sectional area than a region on the immediately upstream side. An annular member adjacent to the seat member is provided on the valve body side of the seat member in the opening direction of the flow passage.
The valve device according to any one of claims 1 to 3, wherein the injection hole is formed by a gap between the seat member and the annular member.