JP7298987B2 - valve devices, seat support members - Google Patents

Description

The present invention relates to valve devices.

Conventionally, as a valve device for switching between opening and closing of a flow path of a fluid, a valve body provided with an opening connected to the flow path, a valve body housed in the valve body for opening and closing the opening of the valve body, and a periphery of the opening A valve assembly is used that includes a seat member positioned at the . When the flow path is closed by the valve device, the valve body is pressed against the seat member to ensure tight contact. By the way, the fluid flowing through the flow path may contain foreign substances such as powders and hard solids. In such a case, a foreign object intervening between the valve body and the seat member may damage the valve body and the seat member, resulting in a decrease in adhesion. The valve device described in Patent Literature 1 removes foreign matter adhering to the surface of the valve body by discharging foreign matter removing fluid from a fluid discharge path that contacts the seat member.

Japanese Patent No. 5123245

However, in the valve device described in Patent Document 1, foreign matter remains on the surface of the valve body, and the foreign matter removal performance is not sufficient. Therefore, there is a demand for a technique for improving the performance of removing foreign matter adhering to the surface of the valve body.

The present invention has been made to solve at least part of the above problems, and can be implemented as the following modes.
[Mode 1] A valve device arranged in the middle of a flow path for a first fluid, comprising a cylindrical valve box having an opening communicating with the flow path, and the opening disposed inside the valve box. a valve body that changes the degree of opening of the valve body, a sheet member that is provided around the opening and is in close contact with the valve body when the degree of opening is in a closed state, and at least one of a cylindrical seat support member into which a portion is inserted and which supports the seat member along the circumferential direction by a distal end portion in the insertion direction, wherein at least one of the valve body and the seat support member is externally The seat support member has a supply port to which a second fluid is supplied, and the seat support member is formed so as to be exposed to the valve body side at the distal end portion, and has a discharge port for discharging the second fluid. A series of first discharge pipes arranged in a direction that intersects a direction parallel to the axial direction, which is the direction of the central axis of the valve body , and that is at a twisted position with respect to the central axis. and a first discharge pipe for swirling the second fluid discharged from the discharge port .
[Mode 2] A seat support member used in a valve device disposed in the middle of a flow path for a first fluid, wherein the valve device includes a cylindrical valve box having an opening communicating with the flow path, a valve body arranged inside the valve body to change the degree of opening of the opening; and a seat member provided around the opening and brought into close contact with the valve body when the degree of opening is in a closed state. At least part of the seat support member is inserted into the opening of the valve body, the seat member is supported by a tip portion in the insertion direction, and the tip portion is exposed to the valve body side. a discharge port for discharging a second fluid; and a first discharge pipe connected to the discharge port, in a direction that intersects the direction parallel to the axial direction, which is the direction of the central axis of the valve body. a first discharge pipe disposed in a direction that is twisted with respect to the central axis , thereby forming a whirlpool for the second fluid discharged from the discharge port .

(1) According to one aspect of the present invention, a valve device is provided. This valve device is a valve device arranged in the middle of a flow path of a first fluid; a cylindrical valve box having an opening communicating with the flow path; a valve body that changes the degree of opening of an opening; a seat member that is provided around the opening and is in close contact with the valve body when the degree of opening is in a closed state; a cylindrical seat support member into which a part is inserted and which supports the seat member along the circumferential direction by a distal end portion in the insertion direction; at least one of the valve body and the seat support member, a supply port to which a second fluid is supplied from the outside; the seat support member; a discharge port formed so as to be exposed to the valve element side at the distal end portion and discharging the second fluid; a first discharge pipe connected to the outlet, the first discharge pipe being arranged along a direction parallel to and intersecting the axial direction; According to this aspect of the valve device, the first discharge pipe of the seat support member is arranged along the direction that intersects the direction parallel to the axial direction, so that the second fluid flows from the discharge port in the axial direction. It can be ejected diagonally. Therefore, the second fluid can be discharged in a vortex toward the valve body inside the opening, so that the performance of removing foreign matter adhering to the surface of the valve body can be improved.

(2) In the valve device of the above aspect, the valve box has the supply port; the seat support member communicates with the first discharge pipe and is supplied from the supply port via the valve box. At least one of the seat support member and the valve body is provided with a communication port that communicates with the communication port and the supply port, respectively, and is formed along the entire circumference. An annular groove may be formed. According to the valve device of this aspect, at least one of the seat support member and the valve box is formed with an annular groove formed along the entire circumference, so that the gas is supplied from the supply port through the valve box. The second fluid can be made to flow over the entire circumference using the annular groove. Therefore, even in a configuration in which the circumferential position of the supply port and the circumferential position of the communication port do not match, the second fluid can be supplied to the communication port. In addition, in a configuration including a plurality of first discharge pipes and communication ports, it is possible to suppress unevenness in the amount of the second fluid supplied to each communication port.

(3) In the valve device of the above aspect, the seat support member may further include a flange portion that is in contact with the axial end face of the valve body from the outside of the valve body and is connected to the end face. good. According to the valve device of this aspect, since the seat support member has the flange portion, the seat support member can be easily connected to the pipe of the upstream flow path and the valve box, and can be easily released from the connection.

(4) In the valve device of the above aspect, the seat support member has a plurality of the discharge ports and a plurality of the first discharge pipes; parallel to each of the first discharge pipes in the axial direction. , may be equal to each other. According to this aspect of the valve device, since the angles formed by the first discharge pipes and the direction parallel to the axial direction are equal to each other, when the second fluid is discharged from the discharge port, The discharged second fluid can be easily swirled. Therefore, it is possible to more reliably prevent foreign matter from remaining on the surface of the valve body.

(5) In the valve device of the above aspect, the seat support member may be provided with four or more discharge ports formed at different positions along the circumferential direction in the distal end portion. According to this aspect of the valve device, the seat support member has four or more discharge ports formed at different positions along the circumferential direction. The second fluid discharged inside can be easily swirled. Therefore, it is possible to more reliably prevent foreign matter from remaining on the surface of the valve body.

(6) In the valve device of the above aspect, at least one of the valve body and the seat support member may be provided with a plurality of supply ports including two supply ports that are 180 degrees apart from each other. According to this aspect of the valve device, since a plurality of supply ports including two supply ports that are 180 degrees apart from each other are provided, the amount of the second fluid supplied to the first discharge pipe is uneven in the circumferential direction. can prevent it from becoming

(7) In the valve device of the above aspect, the valve body may be configured by a double eccentric structure valve. According to the valve device of this aspect, since the valve body is composed of the double eccentric structure valve, the valve body and the seat member are damaged due to foreign substances interposed between the valve body and the seat member. can be suppressed.

(8) According to another aspect of the invention, a seat support member is provided. This seat support member is a seat support member used in a valve device disposed in the middle of the first fluid flow path; the valve device is a cylindrical valve box having an opening communicating with the flow path. a valve body arranged inside the valve body to change the degree of opening of the opening; and a seat member provided around the opening and brought into close contact with the valve body when the degree of opening is in a closed state. at least a part of the seat support member is inserted into the opening of the valve body, and supports the seat member by a distal end portion in the insertion direction; the distal end portion is exposed to the valve body side; a discharge port for discharging the second fluid; and a first discharge pipe connected to the discharge port, the first discharge pipe being arranged along a direction parallel to and intersecting the axial direction. and; According to this aspect of the seat support member, the first discharge pipe of the seat support member is arranged along the direction that intersects the direction parallel to the axial direction. 2 fluid can be discharged obliquely with respect to the axial direction from the outlet. Therefore, the second fluid can be discharged in a vortex toward the valve body inside the opening, so that the performance of removing foreign matter adhering to the surface of the valve body can be improved.

The present invention can also be implemented in various forms. For example, it can be implemented in the form of a method for manufacturing a valve device, a method for manufacturing a seat support member used in the valve device, a method for removing foreign matter from the valve device, and the like.

It is an explanatory view showing a schematic structure of a valve device as one embodiment of the present invention. FIG. 2 is an explanatory view showing a partial cross section along line 2-2 of FIG. 1; 3 is an enlarged view showing an enlarged region 3 of FIG. 2; FIG. FIG. 2 is a perspective view showing an external configuration of a seat support member; FIG. 2 is a perspective view showing an external configuration of a seat support member; FIG. 3 is a front view showing the external configuration of the seat support member; FIG. 4 is an explanatory diagram for explaining opening and closing operations of a valve mechanism; FIG. 4 is an explanatory diagram for explaining opening and closing operations of a valve mechanism; FIG. 4 is an explanatory diagram for explaining opening and closing operations of a valve mechanism;

A. Embodiment:
A-1. overall structure:
FIG. 1 is an explanatory diagram showing a schematic configuration of a valve device as one embodiment of the present invention. FIG. 2 is an explanatory diagram showing a partial cross section along line 2-2 of FIG. FIG. 3 is an enlarged view showing an enlarged area 3 in FIG. FIG. 1 shows the external configuration of the valve device 100 , and also shows the cross-sectional shape of the valve device 100 in a portion on the right side of the rotation axis AX of the valve body 50 . FIG. 2 shows the external configuration of the air cylinder 10 and the cross section of the valve mechanism 20, and the direction D in which the fluid flows is indicated by an outline arrow. 1 to 3 show mutually orthogonal X-, Y- and Z-axes. The X-, Y- and Z-axes of FIGS. 1-3 correspond to the X-, Y- and Z-axes of the other figures, respectively.

The valve device 100 is arranged in the middle of a flow path through which fluid containing foreign matter such as ash flows in an incineration facility for sewage sludge or the like, and switches between opening and closing of the flow path. The valve device 100 includes an air cylinder 10 and a valve mechanism section 20 .

The air cylinder 10 drives the valve mechanism section 20 . The air cylinder 10 has a piston (not shown) therein, and the piston slides with compressed air to rotate the valve stem 40 of the valve mechanism 20 .

The valve mechanism unit 20 opens and closes the connected flow path. The valve mechanism section 20 in this embodiment is composed of a so-called two-way valve. The opening/closing operation of the valve mechanism portion 20 will be described later. As shown in FIG. 2 , the valve mechanism section 20 includes a valve body 30 , a valve stem 40 , a valve body 50 , a seat member 60 and a seat support member 70 .

The valve body 30 has a substantially cylindrical external shape. An opening 31 and a through hole 35 are formed in the valve box 30 . The opening 31 is formed by the inner peripheral surface of the valve box 30 and communicates with the upstream flow path Pu and the downstream flow path Pd. Note that FIG. 2 shows the valve device 100 in a closed state in which the valve body 50 closes the opening 31 . The through-hole 35 is formed on the +Z direction side at substantially the center of the valve body 30 in the axial direction. A valve stem 40 is rotatably inserted into the through hole 35 .

The valve body 30 has an upstream flange portion 32 and a downstream flange portion 38 . The upstream flange portion 32 has an annular external shape and forms an upstream end surface of the valve body 30 . A flange portion 71 of a seat support member 70 to be described later is connected to the upstream flange portion 32 . The downstream flange portion 38 has an annular external shape and constitutes the downstream end face of the valve body 30 . A cylindrical pipe (not shown) forming the downstream flow path Pd is connected to the downstream flange portion 38 using bolts and nuts (not shown).

As shown in FIG. 1 , two supply ports 33 and two valve box internal passages 34 are formed in the upstream flange portion 32 . The two supply ports 33 are formed 180 degrees apart from each other at the radially outer end of the upstream flange portion 32 . Air for removing foreign matter is supplied to the supply port 33 from the outside. As shown in FIG. 3 , each in-valve passage 34 communicates with each supply port 33 and penetrates the upstream flange portion 32 radially inward.

As shown in FIG. 2 , the valve stem 40 rotates due to the output from the air cylinder 10 . One end of the valve stem 40 is connected to the air cylinder 10 and the other end is connected to the valve body 50 . The valve stem 40 rotates the valve body 50 through an angular range of 90 degrees. The rotation axis AX of the valve stem 40 and the rotation axis AX of the valve body 50 coincide.

The valve body 50 is arranged inside the valve box 30 . The valve body 50 includes an arcuate portion 51 , an upper arm portion 55 and a lower arm portion 56 . The arcuate portion 51 has a substantially disk-like external shape. More specifically, the sphere was cut by two planes perpendicular to the radial direction of one of the imaginary spheres and parallel to each other and located on the same side of the center of the sphere. It has such an external shape. In other words, the shape of the side end surface 52 of the arcuate portion 51 is a convex curved surface forming part of such a sphere. Arcuate portion 51 is supported by upper arm portion 55 and lower arm portion 56 .

The upper arm portion 55 and the lower arm portion 56 each have a curved plate-like external shape. The upper arm portion 55 is connected to the valve stem 40 . The lower arm portion 56 is connected to a support pin 41 arranged coaxially with the rotation axis AX of the valve stem 40 . The upper arm portion 55 and the lower arm portion 56 rotate together with the arcuate portion 51 within the valve body 30 within an angular range of 90 degrees around the rotation axis AX of the valve stem 40 . The valve body 50 is rotatably provided inside the valve box 30 to change the degree of opening of the opening 31 of the valve box 30 .

The seat member 60 has an annular external shape and is arranged around the opening 31 of the valve body 30 . As shown in FIG. 2 , the seat member 60 is arranged upstream of the rotation axis AX of the valve body 50 . The axis PC of the sheet member 60 coincides with the axes PC of the flow paths Pu and Pd. As shown in FIG. 3, the sheet member 60 has a sealing surface 61. As shown in FIG. The sealing surface 61 constitutes a surface facing the valve body 50 . The shape of the seal surface 61 is a substantially spherical concave curved surface. The sheet member 60 is biased by a leaf spring 65 and configured to be slightly movable along an axis parallel to the X axis. Therefore, the sealing surface 61 is in close contact with the side end surface 52 of the arcuate portion 51 of the valve body 50 when the opening 31 is closed.

The valve mechanism 20 of this embodiment is composed of a valve body 50 of a double eccentric structure valve. That is, the rotation axis AX of the valve body 50 is eccentric with respect to the axis PC of the seat member 60 , and the rotation axis AX of the valve body 50 is also eccentric with respect to the seal surface 61 of the seat member 60 .

A-2. Configuration of the seat support member:
4 and 5 are perspective views showing the external configuration of the seat support member 70. FIG. FIG. 6 is a front view showing the external configuration of the seat support member 70. As shown in FIG. FIG. 6 shows a view of the sheet support member 70 viewed from the downstream side. 4 to 6, the second discharge pipe 76 and the first discharge pipe 77 formed in the seat support member 70 are indicated by dashed lines.

The seat support member 70 has a substantially cylindrical outer shape. The seat support member 70 has a flange portion 71 and an insert portion 72 . The flange portion 71 has approximately the same outer diameter as the outer diameter of the valve body 30 . As shown in FIG. 2 , the flange portion 71 is connected to the upstream side flange portion 32 of the valve body 30 from the outside of the valve body 30 in contact therewith. A cylindrical pipe (not shown) forming the upstream flow path Pu is connected to the upstream flange portion 32 and the flange portion 71 using bolts and nuts (not shown).

As shown in FIG. 3 , the insert portion 72 continues downstream from the flange portion 71 and is inserted inside the valve box 30 . A space surrounded by the insertion direction tip portion 73 of the insert portion 72 indicated by a dashed line in FIG. The sheet member accommodating portion 69 accommodates the sheet member 60, the leaf spring 65, and the like. The seat support member 70 supports the seat member 60 along the axial direction and the circumferential direction with the tip portion 73 .

As shown in FIG. 3 , the insert portion 72 includes an annular groove 74 , a communication port 75 , a second exhaust pipe 76 , a first exhaust pipe 77 and an exhaust port 78 . The annular groove 74 is formed along the entire circumference of the outer peripheral surface of the insert portion 72 at a position in the axial direction corresponding to the in-valve passage 34 . The communication port 75 is formed radially inward of the annular groove 74 (that is, at the bottom portion of the annular groove 74 ), and receives foreign matter removing air supplied from the supply port 33 through the valve box 30 . That is, the annular groove 74 communicates with the communication port 75 and the supply port 33 respectively.

As shown in FIGS. 3 to 6 , the second discharge pipe 76 communicates with the communication port 75 and extends radially inward from the outer peripheral surface of the insert portion 72 . In addition, as shown in FIG. 3, the second discharge pipe 76 does not penetrate radially inward. The second discharge pipe 76 has a linear external shape with a constant diameter. The first discharge pipe 77 is formed continuously with the second discharge pipe 76 and the discharge port 78 respectively. The first discharge pipe 77 has a linear external shape with a constant diameter and is formed substantially parallel to the inner peripheral surface of the insert portion 72 . The discharge port 78 is formed at the distal end portion 73 of the seat support member 70 so as to be exposed to the valve body 50 side. The discharge port 78 is formed in the vicinity of the seal surface 61 and discharges air for removing foreign matter to the valve body 50 side.

As shown in FIG. 5, the first discharge pipe 77 is arranged along a direction that intersects the direction parallel to the axial direction. In this embodiment, the angle θ between the first discharge pipe 77 and the direction parallel to the axial direction is about 25 degrees. In this embodiment, eight communication ports 75, second discharge pipes 76, first discharge pipes 77, and discharge ports 78 are arranged at equal intervals along the circumferential direction. In this embodiment, the angles θ formed between each of the first discharge pipes 77 and the direction parallel to the axial direction are equal to each other.

In this embodiment, the valve body 30, the valve stem 40, the valve body 50, the seat member 60, and the seat support member 70 are all made of stainless steel. In addition, instead of stainless steel, it may be made of any other metal material such as ductile cast iron or bronze. Also, the sheet member 60 may be made of resin such as PTFE.

In this embodiment, the fluid containing foreign matter such as ash corresponds to a subordinate concept of the first fluid in the means for solving the problem, and the air for removing foreign matter is the second fluid in the means for solving the problem. corresponds to a subordinate concept of fluid in

A-3. Opening and closing operation of the valve mechanism:
7 to 9 are explanatory diagrams for explaining the opening/closing operation of the valve mechanism portion 20. FIG. FIG. 7 shows the fully open valve state. FIG. 8 shows a state in the middle of transition from the fully open state to the closed state. FIG. 9 shows the closed state. 7 to 9 show part of the cross section of the valve mechanism 20 viewed from the +Z direction side.

As shown in FIG. 7, the degree of opening of the opening 31 is fully opened when the arcuate portion 51 of the valve body 50 is rotated to a position deviated from the opening 31 by 90 degrees. When the opening 31 is fully opened, the fluid flowing from the upstream flow path Pu flows through the opening 31 along the direction D and is discharged to the downstream flow path Pd.

As shown in FIG. 8, the degree of opening of the opening 31 changes from the fully open state to the closed state as the valve element 50 rotates. In the state shown in FIG. 8, the opening 31 is not blocked by the arcuate portion 51 of the valve body 50, so it can be said that the valve is open. When the opening 31 is open, the sealing surface 61 of the seat member 60 and the side end surface 52 of the valve body 50 are not in contact with each other. It should be noted that the state similar to that shown in FIG. 8 also occurs when the closed state changes to the fully opened state.

As shown in FIG. 9, further rotation of the valve element 50 causes the opening 31 to be closed. When the opening 31 is closed, the sealing surface 61 of the seat member 60 and the side end surface 52 of the valve body 50 are in close contact with each other. By completely blocking the opening 31 with the arcuate portion 51 of the valve body 50, the fluid flowing from the upstream flow path Pu is blocked. The valve mechanism 20 of this embodiment is composed of the valve body 50 of the double eccentric structure valve as described above. For this reason, the sealing surface 61 and the side end surface 52 start to be in close contact with each other before the degree of opening of the opening 31 reaches the valve closed state, and are completely in close contact with each other when the valve is in the closed state.

A-4. Air discharge action:
In the valve device 100 of this embodiment, air for removing foreign matter is discharged in conjunction with the degree of opening of the opening 31 . More specifically, the foreign matter removing air is discharged at the timing immediately before the opening degree of the opening 31 changes from the open state to the closed state, and at the timing immediately before it changes from the closed state to the open state. Air is supplied from an air compressor (not shown) to the two supply ports 33 through pipes (not shown). Switching between supply and stop of air is performed by an electromagnetic valve (not shown) controlled by a CPU (not shown). The CPU also controls the air cylinder 10 to interlock the opening degree of the opening 31 with the timing of air discharge.

Air supplied to the supply port 33 shown in FIG. The air that has flowed in the circumferential direction through the annular groove 74 passes through each communication port 75, flows into the second discharge pipe 76 and the first discharge pipe 77, and is discharged from the discharge port 78 toward the valve body 50 side.

In the seat support member 70 of this embodiment, each of the first discharge pipes 77 is formed to form an angle θ of about 25 degrees with the direction parallel to the axial direction. The air discharged from the discharge port 78 through is discharged obliquely with respect to the axial direction. Therefore, the air discharged from the eight discharge ports 78 flows in a vortex inside the opening 31 .

When the opening 31 is open, foreign matter such as ash contained in the fluid adheres to the surface of the arcuate portion 51 and the surface of the side end surface 52 of the valve body 50 . When the air is discharged from the discharge port 78 to the valve body 50 side at the timing just before the opening 31 is closed, the foreign matter adhering to the surface of the valve body 50 is removed by the air flowing in a vortex. removed by More specifically, since the arcuate portion 51 of the valve body 50 is in a state immediately before closing the opening 31 , the air flows in a vortex on the surface of the arcuate portion 51 and bounces off the surface of the arcuate portion 51 . As a result, the foreign matter adhering to the surface of the arcuate portion 51 and the surface of the side end face 52 is mainly blown away upstream. Therefore, the side end surface 52 of the valve body 50 and the sealing surface 61 of the seat member 60 can be brought into close contact with each other to close the opening 31 with the foreign matter removed. It is possible to suppress the foreign matter from being sandwiched between the Therefore, it is possible to prevent the side end surface 52 and the sealing surface 61 from being damaged due to the rotation of the valve body 50 due to foreign matter interposed between the side end surface 52 and the sealing surface 61 .

At the timing immediately before the valve is opened from the closed state, foreign matter such as ash contained in the fluid adheres or accumulates on the surface of the arcuate portion 51 of the valve body 50 . Similarly, at the timing immediately before the valve is opened from the closed state, when air is discharged from the discharge port 78 to the valve body 50 side, the foreign matter adhering or accumulated on the surface of the valve body 50 is swirled. removed by the air flowing through the Therefore, the contact between the side end surface 52 and the seal surface 61 can be released in a state where the foreign matter is removed. Therefore, it is possible to prevent the side end surface 52 and the sealing surface 61 from being damaged due to the rotation of the valve body 50 due to foreign matter interposed between the side end surface 52 and the sealing surface 61 .

In addition, in a mode in which each first discharge pipe is formed along a direction parallel to the axial direction, the air discharged from each discharge port is not discharged obliquely with respect to the axial direction, so the air is not discharged in a spiral shape. . For this reason, the flow of air discharged from each discharge port is not regulated, and multiple flows of air discharged from each discharge port collide with each other on the surface of the valve body, canceling out each other's flows. Foreign matter remains on the surface of the valve body.

According to the valve device 100 of the present embodiment described above, the first discharge pipe 77 of the seat support member 70 is arranged along the direction parallel to the axial direction and the direction intersecting with the axial direction. Air can be discharged obliquely from the discharge port 78 with respect to the axial direction. For this reason, since the air can be discharged in a vortex toward the valve body 50 inside the opening 31, the performance of removing foreign matter adhering to the surface of the valve body 50 can be improved. Therefore, it is possible to prevent the valve body 50 and the seat member 60 from being damaged due to foreign substances interposed between the valve body 50 and the seat member 60, and the adhesion between the valve body 50 and the seat member 60 is reduced. can be suppressed, and leakage of fluid from the opening 31 can be suppressed. In addition, it is possible to suppress an increase in the torque of the valve body 50 caused by a foreign object interposed between the valve body 50 and the seat member 60, thereby suppressing malfunction of the valve device 100.

Further, since the angle θ between each of the first discharge pipes 77 and the direction parallel to the axial direction is equal to each other, the foreign matter removing air is discharged inside the opening 31 when discharged from the discharge port 78 . It is easy to vortex the air. Therefore, it is possible to more reliably prevent foreign matter from remaining on the surface of the valve body 50 . In addition, since eight discharge ports 78 are formed in the sheet support member 70, compared with the mode in which the number of the discharge ports 78 is small, when the air for removing the foreign matter is discharged from the discharge ports 78, the opening 31 is The air discharged inside can be easily swirled.

Further, since the seat support member 70 is provided with the annular groove 74 , the air that has flowed in from the internal valve box passage 34 can be made to flow over the entire circumference using the annular groove 74 . Therefore, by shifting the phase between the circumferential position of the supply port 33 and the circumferential position of the communication port 75, the communication port 75 whose circumferential position does not match the circumferential position of the supply port 33 can be Also, air can be supplied, and formation of an excessive number of supply ports 33 can be suppressed. In addition, it is possible to prevent the amount of air supplied to each communication port 75 from becoming uneven. In addition, since the supply port 33 is formed in the valve box 30, the air can be spread all around using the annular groove 74, so the structure for spreading the air all around can be simplified. Complication of the manufacturing process of the seat support member 70 can be suppressed. Moreover, since the two supply ports 33 are formed 180 degrees apart from each other, it is possible to prevent the amount of air supplied to the annular groove 74 and the first discharge pipe 77 from becoming uneven in the circumferential direction. In addition, since the seat support member 70 has the flange portion 71, the seat support member 70 can be easily connected to the pipe forming the upstream flow path Pu and the valve box 30, and can be easily released from the connection. Further, since the valve body 50 is composed of a double eccentric structure valve, the side end surface 52 and the sealing surface 61 do not completely contact each other until the degree of opening of the opening 31 is completely closed. Therefore, it is possible to prevent the side end surface 52 and the sealing surface 61 from being damaged due to foreign matter interposed between the side end surface 52 and the sealing surface 61 .

B. Other embodiments:
B-1. Alternative Embodiment 1:
In the above embodiment, each of the eight communication ports 75, the second discharge pipe 76, the first discharge pipe 77, and the discharge port 78 are arranged at regular intervals along the circumferential direction. The invention is not limited to this. The numbers of the communication ports 75, the second discharge pipes 76, the first discharge pipes 77, and the discharge ports 78 are not limited to 8, and may be set to any other number such as 16 or 32, for example. . From the viewpoint of stably discharging the foreign matter removing air in a spiral shape, the number is preferably set to 2 or more, and more preferably set to 4 or more. Further, the communication ports 75, the second discharge pipe 76, the first discharge pipe 77, and the discharge port 78 may be arranged at different intervals along the circumferential direction. From the viewpoint of stably discharging the air for removing foreign matter in a spiral shape, it is preferable that they are arranged at regular intervals. That is, in general, the sheet support member 70 may have four or more discharge ports 78 formed at different positions along the circumferential direction at the leading end portion 73 . Such a configuration also provides the same effects as the valve device 100 of the embodiment.

B-2. Alternative Embodiment 2:
In the above embodiment, the angle θ formed between each of the first discharge pipes 77 and the direction parallel to the axial direction is about 25 degrees, but it is not limited to about 25 degrees and may be any other angle. may For example, it may be about 15 degrees or about 35 degrees. From the viewpoint of stably discharging air for removing foreign matter in a spiral shape, the angle is preferably about 10 degrees or more, and from the viewpoint of suppressing a decrease in the strength of the insert portion 72, the angle is preferably about 45 degrees or less. Also, the angles θ formed between each of the first discharge pipes 77 and the direction parallel to the axial direction may be different from each other. Alternatively, each of the first discharge pipes 77 may be formed so that air is discharged in a clockwise spiral, or each of the first discharge pipes 77 is formed so that air is discharged in a counterclockwise spiral. You may Such a configuration also provides the same effects as the valve device 100 of the embodiment.

B-3. Alternative Embodiment 3:
Although the annular groove 74 is formed in the seat support member 70 in the above embodiment, it may be formed in the valve body 30 or may be formed in both the seat support member 70 and the valve body. . That is, in general, at least one of the seat support member 70 and the valve box 30 is formed with an annular groove 74 extending over the entire circumference and communicating with the communication port 75 and the supply port 33 respectively. good too. Since the annular groove 74 is formed, air can be supplied to the communication port 75 even in a configuration in which the circumferential position of the supply port 33 and the communication port 75 do not coincide with each other. Alternatively, the annular groove 74 may be omitted. In such an embodiment, the valve box internal passage 34 and the communication port 75 may be in direct communication. Such a configuration also provides the same effects as the valve device 100 of the embodiment.

B-4. Alternative Embodiment 4:
In the above-described embodiment, two supply ports 33 are formed in the valve box 30 180 degrees apart from each other, but the present invention is not limited to this. The supply port 33 may be formed in the seat support member 70, or may be formed in both the valve body 30 and the seat support member 70, respectively. Also, the number of supply ports 33 may be one, or any number of three or more. In addition, from the viewpoint of suppressing unevenness in the circumferential direction of the amount of air supplied to the annular groove 74 and the first discharge pipe 77, a plurality of supply ports 33 including two supply ports 33 that are 180 degrees apart from each other are provided. A mouth 33 is preferably provided. This configuration also provides the same effects as the valve device 100 of the embodiment.

B-5. Alternative Embodiment 5:
The configuration of the second discharge pipe 76 and the first discharge pipe 77 in the above embodiment is merely an example, and various modifications are possible. For example, at least a portion of the second discharge pipe 76 and the first discharge pipe 77 may be curved. Further, for example, the second discharge pipe 76 may be formed in a direction intersecting the radial direction of the sheet support member 70, and the diameter itself may not be constant. Further, for example, the first discharge pipe 77 may be formed in a direction that intersects the inner peripheral surface of the insert portion 72, and may be expanded in diameter toward the discharge port 78, or may be reduced in diameter. good. This configuration also provides the same effects as the valve device 100 of the embodiment.

B-6. Alternative Embodiment 6:
Although the seat support member 70 of the above embodiment has the flange portion 71, the flange portion 71 may be omitted. In this aspect, the pipes forming the flow paths Pu and Pd and the valve device 100 may be connected by screwing or welding. This configuration also provides the same effects as the valve device 100 of the embodiment.

B-7. Alternative Embodiment 7:
Although the valve device 100 of the above-described embodiment includes the valve body 50 of the double eccentric structure valve, it is not limited to the double eccentric structure valve, and may have any other valve structure. For example, it may be a single eccentric structure valve or a valve structure without eccentricity. Also, the present invention may be applied to any other rotary type valve devices such as ball valves and butterfly valves. Further, for example, the present invention is not limited to rotary-type valve devices, but can be applied to pressing-type valve devices such as globes, slide-type valve devices such as gate valves, and crush-type valve devices such as diaphragm valves. good too. Also with this configuration, the first discharge pipe 77 of the seat support member 70 is arranged along the direction parallel to the axial direction of the seat support member 70 and the direction intersecting with the axial direction of the seat support member 70, so that the air inside the opening 31 is valved. Since the fluid can be discharged in a vortex toward the body 50, the performance of removing foreign matter adhering to the surface of the valve body 50 can be improved.

B-8. Alternative Embodiment 8:
In the valve device 100 of the above-described embodiment, air for removing foreign substances is supplied at the timing immediately before the opening degree of the opening 31 changes from the valve-open state to the valve-closed state and at the timing immediately before the valve-open state from the valve closed state. Although it was discharged, the present invention is not limited to this. For example, the air may be discharged at any other timing or intermittently. Further, for example, instead of air, foreign matter may be removed by discharging any other fluid such as nitrogen gas, cold/hot water, steam, or the like. This configuration also provides the same effects as the valve device 100 of the embodiment.

B-9. Alternative Embodiment 9:
Although the valve device 100 of the above embodiment is driven by the air cylinder 10, it may be driven by a motor or a manual handle instead of the air cylinder 10. Moreover, the direction in which the valve device 100 is arranged may be appropriately set according to the flow path of the fluid. Further, the valve device 100 may be used not only for incineration equipment for sewage sludge, but also for manufacturing equipment in factories, waste water equipment, and the like. Moreover, the valve device 100 may be used in a flow path of a fluid containing not only powdery foreign matters such as ash but also solid matters such as iron scraps and foreign matters such as hair.

The present invention is not limited to the above-described embodiments, and can be implemented in various configurations without departing from the spirit of the present invention. For example, the technical features in the embodiments corresponding to the technical features in the respective modes described in the Summary of the Invention column may be used to solve some or all of the above problems, or Substitutions and combinations may be made as appropriate to achieve part or all. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10... Air cylinder 20... Valve mechanism part 30... Valve box 31... Opening 32... Upstream side flange part 33... Supply port 34... Passage in valve box 35... Through hole 36... Inner wall surface 38... Downstream side flange part 40... Valve stem DESCRIPTION OF SYMBOLS 41... Support pin 50... Valve body 51... Arcuate part 52... Side end surface 55... Upper arm part 56... Lower arm part 60... Seat member 61... Seal surface 65... Leaf spring 69... Seat member accommodation part 70... Seat support member 71... Flange part 72... Insert part 73... Tip part 74... Annular groove 75... Communication port 76... Second discharge pipe 77... First discharge pipe 78... Discharge port 100... Valve device AX... Rotational axis D... Direction PC... Axis line Pd... channel Pu... channel

Claims (8)

A valve device disposed in the middle of a first fluid flow path,
a cylindrical valve box having an opening communicating with the flow path;
a valve body arranged inside the valve box to change the degree of opening of the opening;
a seat member provided around the opening and in close contact with the valve body when the opening is in a closed state;
a cylindrical seat support member, at least a part of which is inserted into the opening of the valve body, and which supports the seat member along the circumferential direction with a leading end in the insertion direction;
with
at least one of the valve body and the seat support member has a supply port to which a second fluid is supplied from the outside;
The seat support member is
a discharge port formed at the distal end portion so as to be exposed to the valve body side and discharging the second fluid;
A first discharge pipe connected to the discharge port, the direction intersecting the direction parallel to the axial direction of the central axis of the valve body and being twisted with respect to the central axis . a first discharge pipe arranged in the discharge port to vortex the second fluid discharged from the discharge port ;
having
valve device. A valve device according to claim 1,
The valve box has the supply port,
The seat support member has a communication port that communicates with the first discharge pipe and receives the second fluid supplied from the supply port through the valve box,
At least one of the seat support member and the valve body is formed with an annular groove formed along the entire circumference, communicating with the communication port and the supply port, respectively.
valve device. A valve device according to claim 1 or claim 2,
The seat support member further includes:
a flange portion connected to the axial end face of the valve body from the outside of the valve body,
valve device. A valve device according to any one of claims 1 to 3,
The sheet support member has a plurality of the discharge ports and a plurality of the first discharge pipes,
angles formed by each of the first discharge pipes and a direction parallel to the axial direction are equal to each other;
valve device. A valve device according to any one of claims 1 to 4,
The seat support member is
In the tip portion, four or more of the discharge ports formed at different positions along the circumferential direction,
valve device. A valve device according to any one of claims 1 to 5,
At least one of the valve body and the seat support member,
comprising a plurality of the supply ports including two of the supply ports that are 180 degrees apart from each other;
valve device. A valve device according to any one of claims 1 to 6,
The valve body is composed of a double eccentric structure valve,
valve device. A seat support member used in a valve device disposed in the middle of a flow path of a first fluid,
The valve device includes a cylindrical valve box having an opening that communicates with the flow path, a valve body that is arranged inside the valve box and changes the opening degree of the opening, and a valve body that is provided around the opening and has the a seat member that is in close contact with the valve body when the opening is in a closed state;
The seat support member is
At least part of itself is inserted into the opening of the valve body, and the tip in the insertion direction supports the seat member;
a discharge port formed at the distal end portion so as to be exposed to the valve body side and discharging a second fluid;
A first discharge pipe connected to the discharge port, the direction intersecting the direction parallel to the axial direction of the central axis of the valve body and being twisted with respect to the central axis . a first discharge pipe arranged in the discharge port to vortex the second fluid discharged from the discharge port ;
comprising a
seat support member;

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