TW202204793A - Inner circumferential seal structure, seat structure, and valve - Google Patents

Abstract

To provide an inner circumferential seal structure that reduces the operating torque for closing a valve body, a seat structure, and a valve. An inner circumferential seal structure 16 is provided to a seat ring 12 of a butterfly valve 10, protrudes from the inner peripheral surface 12i of the seat ring 12, and is in contact with the outer peripheral surface 14s of a valve body 14 to which a fluid pressure is applied. The inner circumferential seal structure 16 is provided with a first seal surface 18 (1) that is capable of stopping the outer peripheral surface 14s of the valve body 14 as a result of making contact therewith, an engagement protrusion 20 that regulates the rotation of the valve body 14, and an engagement seal surface 18 (3) that is capable of stopping the outer peripheral surface 14s as a result of making contact therewith. The first seal surface 18 (1), the engagement seal surface 18 (3), and the engagement protrusion 20 are positioned, in that order, in the direction in which the outer peripheral surface 14s of the valve body 14 moves due to rotation of the valve body. The seal quantity of the engagement seal surface 18 (3) is greater than that of the first seal surface 18 (1).

Description

Inner peripheral sealing structure, valve seat structure, and valve

The invention of the present application relates to an inner circumference sealing structure, a valve seat structure, and a valve that constitute a valve such as a butterfly valve.

Historically, butterfly valves (valves) have been used to close or open the flow of fluids. In FIG. 7, the butterfly valve 100 is shown as an example. The butterfly valve 100 includes a valve box 102 , a valve seat ring 104 , and a valve body 106 . The valve box 102 and the valve seat ring 104 are snap-fitted and combined with each other. The valve body 106 is disposed in the flow path 108 of the valve seat ring 104 . The valve body 106 is configured to rotate around the rotation center C0. The valve seat ring 104 has, on the inner circumference 104i, a convex sealing portion (inner circumference sealing structure) 110 that the valve body 106 abuts against.

When the valve body 106 stops the fluid, the valve body 106 is rotated to the tightly closed position shown in FIG. 7 . In the closed position of the butterfly valve 100, the outer peripheral surface 106s of the valve body 106 made of metal such as stainless steel enters the sealing portion 110 of the valve seat ring 104 made of elastic members such as rubber (in FIG. 7, the entry is shown as SW). The depth is the closed volume). When the valve body 106 is rotated to the tightly closed position to close the valve body 106 , an operating torque against the force from the sealing portion 110 and the fluid pressure is required. That is, as the SW deepens and the urging force from the sealing portion 110 becomes larger, the operation torque becomes larger. However, as the operating torque increases, the scale of the rotational drive mechanism for rotating the valve body 106 increases. In addition, there is a document related to a rotary drive mechanism of a butterfly valve (refer to Patent Document 1). However, there is no one related to the invention of the present application. [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2003-185047

[Problems to be Solved by Invention]

An object of the invention of the present application is to provide an inner peripheral sealing structure, a valve seat structure, and a valve that can reduce the operating torque for closing the valve body. [Technical means to solve problems]

The feature of the inner peripheral sealing structure of the invention of the present application is that it is provided on the valve seat ring, protrudes from the inner peripheral surface of the valve seat ring, and is in contact with the outer peripheral surface of the valve body for carrying fluid pressure, and have: The first sealing surface is a concave shape and can be abutted and stopped by the outer peripheral surface of the valve body; locking protrusions for locking the valve body to limit the rotation of the valve body; and A buckled sealing surface, which allows the outer peripheral surface of the valve body to abut when the valve body is buckled on the buckled convex portion; In the direction in which the outer peripheral surface of the valve body moves due to the rotation of the valve body, the first sealing surface, the locking sealing surface, and the locking protrusion are sequentially arranged; The inner peripheral sealing structure is configured such that the outer peripheral surface of the valve body enters into a larger depth than the first sealing surface of the latching sealing surface.

Moreover, the inner peripheral sealing structure of the present invention is characterized in that, in the inner peripheral sealing structure, the first sealing structure is sequentially arranged in the direction in which the outer peripheral surface of the valve body moves due to the rotation of the valve body. surface, the above-mentioned locking sealing surface, and the above-mentioned locking protrusion.

Furthermore, the inner peripheral sealing structure of the invention of the present application is characterized in that, in the inner peripheral sealing structure, a second sealing surface having a concave shape for abutting and stopping the outer peripheral surface of the valve body is provided. is continuous with the above-mentioned first airtight surface; and The first sealing surface, the second sealing surface, the locking sealing surface, and the locking protrusion are sequentially arranged in the direction in which the outer peripheral surface of the valve body moves due to the rotation of the valve body; The said second sealing surface is comprised so that the sealing amount is larger than the said 1st sealing surface; The said latching sealing surface is comprised so that the sealing amount may be larger than the said 2nd sealing surface.

In addition, the valve seat structure of the invention of the present application is characterized in that it is equipped with a valve seat ring of a valve, and has: The inner perimeter airtight structure in the above technical solution 1 or 2; The valve rod hole on the valve seat side, into which the valve rod constituting the rotation center of the above valve body is inserted; The valve seat side abutting surface, which is arranged on the periphery of the valve seat side valve rod hole, and the valve body side abutting surface on the periphery of the valve body side valve rod hole provided by the valve body abuts; a continuous first sealing surface, which is continuous with the first sealing surface and extends to the abutting surface on the valve seat side; a continuous locking protrusion, which is continuous with the locking protrusion and extends to the abutment surface on the valve seat side; and a continuous buckle sealing surface, which is continuous with the buckle sealing surface and extends to the abutment surface on the valve seat side; and The continuous first sealing surface, the continuous locking protrusion, and the continuous locking sealing surface have the following shapes: when the valve body connecting surface is connected between the outer peripheral surface of the valve body and the valve body side abutting surface. When the sides are in contact, the whole is closely connected.

Moreover, the valve of the invention of the present application is characterized by including the above-mentioned inner peripheral sealing structure. [Effect of invention]

According to the inner peripheral sealing structure of the invention of the present application, since it is separated from the latching sealing surface that can abut and stop the outer peripheral surface of the valve body, and has a first sealing surface that can abut and stop the outer peripheral surface of the valve body, The operating torque can be set so as not to stop at the latching sealing surface with a larger sealing amount than the first sealing surface, but at the first sealing surface with a smaller sealing amount and a smaller force from the seat ring. Thereby, the valve body can be rotated and closed with a smaller operating torque, and the operating torque can be reduced. Therefore, the scale of the rotary drive mechanism for rotating the valve body can be reduced. In addition, when the fluid pressure is low, even if it stops at the first sealing surface with a small sealing amount, the sealing performance can be maintained. Thereby, even if the operating torque for closing the valve body is reduced, the sealing performance can be maintained.

Embodiments of the inner peripheral sealing structure, the valve seat structure, and the butterfly valve (valve) according to the invention of the present application will be described based on the drawings. In FIGS. 1-4, the code|symbol 16 is the inner periphery airtight structure of the invention of this application. In FIGS. 3 and 4 , reference numeral 34 denotes the valve seat structure of the present invention. In FIG. 2 and FIG. 4 , the symbol 10 is the butterfly valve of the present invention.

(constitute) As shown in FIG. 2 , the butterfly valve 10 includes a valve box 114 and a valve seat ring 12 combined with the valve box 114 . The valve box 114 is formed of, for example, aluminum (pure aluminum or aluminum alloy). The valve box 114 may also be formed of a metal other than aluminum. The seat ring 12 may also be formed of, for example, EPDM (ethylene propylene rubber) or NBR (nitrile butadiene rubber), and other rubbers or resins. In addition, the butterfly valve 10 includes a valve body 14 disposed in the seat ring 12 and two valve rods 22 (shown in FIG. 3( b )) fixed to the upper and lower parts of the valve body 14 . The valve body 14 has a substantially disc shape or a substantially disc shape. The valve body 14 is formed of stainless steel, for example. The valve body 14 may also be formed of a metal other than stainless steel. The valve body 14 is provided with the valve body side valve rod hole 26 (shown in FIG.3(b)) in the upper part and the lower part, into which the valve rod 22 is inserted and fixed. The valve rod 22 may also be formed of stainless steel, and may be formed of a metal other than stainless steel. The valve rod 22 rotatably penetrates through the valve case 114 and the valve rod hole 24 on the valve seat side of the valve seat ring 12 (shown in FIG. 3( a )). The butterfly valve 10 includes a fixing mechanism 140 (shown in FIG. 4 ) that is connected to the valve box 114 and is fixed to a valve driving portion (not shown) having a rotational driving mechanism. The fixing mechanism 140 is formed of, for example, aluminum, or a metal other than aluminum.

(Inner peripheral sealing structure (sealing part) 16) As shown in FIG. 1 , the seat ring 12 includes an inner peripheral sealing structure 16 which protrudes from the inner peripheral surface 12i of the seat ring 12 and contacts the outer peripheral surface 14s of the valve body 14 carrying the fluid pressure. As shown in FIG. 4 , the inner peripheral airtight structure 16 is provided at two positions on the left and right of the seat ring 12 (symmetrical positions with the rotation center C1 as the axis of symmetry) when viewed from the front. The inner peripheral sealing structure 16 includes: a first sealing surface 18(1) on which the outer peripheral surface 14s of the valve body 14 abuts and stops, and a second sealing surface 18(2) on which the outer peripheral surface 14s of the valve body 14 comes into contact with It abuts and stops, and is continuous with the said 1st sealing surface 18 (1). The 1st sealing surface 18 (1) and the 2nd sealing surface 18 (2) have a concave curved surface shape in order to reduce the sealing amount as much as possible. In addition, the inner peripheral sealing structure 16 is provided with: a latching sealing surface 18 ( 3 ) which the outer peripheral surface 14s of the valve body 14 abuts on and stops, and which is continuous with the second sealing surface 18 ( 2 ); and the latching convex portion 20 , which is locked by the outer peripheral surface 14s of the valve body 14 to limit the rotation of the valve body 14 . The outer peripheral surface 14s of the valve body 14 is configured to be able to abut against the locking sealing surface 18( 3 ) and stop by being locked by the locking protrusion 20 . Moreover, in the direction in which the outer peripheral surface 14s of the valve body 14 moves due to the rotation of the valve body 14, the inner peripheral sealing structure 16 has a first sealing surface 18(1), a second sealing surface 18(2), a latching surface 18(1), a second sealing surface 18(2), The sealing surface 18 ( 3 ), and the locking protrusion 20 .

In the inner peripheral sealing structure 16, the sealing amount (the first sealing surface 18( 1) The amount of airtightness: SW1, the amount of airtightness on the sealing surface: SW3) is larger. In addition, it is comprised so that the sealing amount (sealing amount of the second sealing surface 18(2): SW2) of the second sealing surface 18(2) is larger than that of the first sealing surface 18(1). In addition, it is comprised so that the sealing amount may be larger than the 2nd sealing surface 18(2) of the latching sealing surface 18(3). That is, the urging force from the seat ring 12 is changed in the order of stopping by the first sealing surface 18(1), stopping by the second sealing surface 18(2), and stopping by the latching sealing surface 18(3). Big. Therefore, the operating torque for closing the valve body 14 is stopped by the first sealing surface 18(1), stopped by the second sealing surface 18(2), and stopped by locking the sealing surface 18(3) in this order. and become larger.

(Valve seat structure 34) As shown in FIG. 3 , the valve seat ring 12 includes a valve seat structure 34 including two (left and right in front view) inner peripheral sealing structures 16 . In FIG. 3( a ), the center line (valley line) is shown in the case where the one-point chain line other than the rotation center C1 is shown on the sealing surface, and the ridge line is shown in the case of the convex portion. In addition, in FIG.3(a), the dotted line is the line which shows the boundary of the inner peripheral sealing structure 16 and the valve seat connection surface 31 mentioned later. In Fig. 3(b), the dotted line is the line showing the boundary between the outer peripheral surface 14s of the valve body 14 and the valve body connecting surface 32 described later, and the two-dot chain line is the line showing the contact between the valve body connecting surface 32 and the valve body side described later. Line of boundary of junction 28. The valve seat structure 34 is provided in two parts of the upper part side and the lower part side of the valve seat ring 12 in FIG. 4 .

As shown in FIG. 3( a ), the valve seat structure 34 includes a valve seat side stem hole 24 into which the stem 22 constituting the rotation center C1 of the valve body 14 is inserted. In addition, the valve seat structure 34 includes a valve seat side abutment that is provided around the valve seat side stem hole 24 and that makes the valve body side contact surface 28 of the periphery of the valve body side stem hole 26 that the valve body 14 have abut against. face 30. In addition, in FIG. 3 (a), the range which shows the broken line of the valve seat side contact surface 30 is the range which abuts on the valve body side contact surface 28. Further, the valve seat structure 34 includes: a continuous first sealing surface 18(1)ex which is continuous with the first sealing surface 18(1) and extends to the valve seat side contact surface 30; and a continuous second sealing surface 18( 2) ex, which is continuous with the second sealing surface 18 ( 2 ) and extends to the valve seat side contact surface 30 . In addition, the valve seat structure 34 includes: a continuous locking sealing surface 18(3)ex, which is continuous with the locking sealing surface 18(3) and extends to the valve seat side abutting surface 30; and a continuous locking protrusion 20ex, It is continuous with the locking protrusion 20 and extends to the contact surface 30 on the valve seat side. The continuous first sealing surface 18(1)ex, the continuous second sealing surface 18(2)ex, the continuous locking sealing surface 18(3)ex, and the continuous locking convex portion 20ex have an outer peripheral surface 14s relative to the valve body 14 The side 32si of the curved shape of the valve body connecting surface 32 connected with the valve body side abutting surface 28 is a curved shape that is in close contact with each other as a whole. The sealing amount of the continuous 1st sealing surface 18(1)ex, the 2nd continuous sealing surface 18(2)ex, and the continuous locking sealing surface 18(3)ex becomes smaller as it approaches the valve seat side contact surface 30.

(action and effect) (Inner peripheral airtight structure 16) The function and effect of the inner peripheral sealing structure 16 of the butterfly valve 10 of the present invention will be described below with reference to FIGS. 1 and 2 . In the inner peripheral sealing structure 16, the operating torque required to close the valve body 14 is in the order of the sealing amount increasing, that is, SW1 with the smallest sealing amount is the first sealing surface 18(1), and the sealing amount is larger than SW2 and larger than SW3. The order of the smaller second sealing surface 18(2) and the SW3 with the largest sealing amount, that is, the latching sealing surface 18(3) becomes larger. Also, the greater the fluid pressure, the greater the sealing amount must be. Therefore, for example, the operating torque can be set so that when the fluid pressure is 0.5 MPa, the outer peripheral surface 14s of the valve body 14 is stopped by the first sealing surface 18(1) to close the valve body 14, and when the fluid pressure is 1.0 MPa In this case, the outer peripheral surface 14s of the valve body 14 is stopped by the second sealing surface 18(2) and the valve body 14 is closed. When the fluid pressure exceeds 1.0 MPa, the outer peripheral surface of the valve body 14 is closed by the locking surface 18(3). The face 14s stops and closes the valve body 14 . When the operating torque is set so that the outer peripheral surface 14s of the valve body 14 is stopped by the first sealing surface 18( 1 ) and the valve body 14 is closed, the operating torque becomes the smallest. Therefore, the valve body 14 can be closed with a small operating torque, and the scale of the rotational driving mechanism of the valve body can be reduced. In addition, by bringing the outer peripheral surface 14s of the valve body 14 into contact with the first sealing surface 18( 1 ) of the smaller sealing amount SW1, the life of the seat ring 12 and the valve body 14 can be increased. At this time, the sealing amount SW1 is the smallest, but since the fluid pressure received by the valve body 14 is a minimum of 0.5 MPa, it is sufficient to maintain the sealing performance. Thereby, the valve body 14 can be closed with a small operating torque, and the sealing performance can be maintained.

In addition, according to the inner circumferential sealing structure 16, the fluid pressure is 1.0 MPa, and the operating torque is set so that the outer circumferential surface 14s of the valve body 14 is stopped by the second sealing surface 18(2) and the valve body 14 is closed. The valve body 14 can also be closed with a smaller operating torque than the case where the outer peripheral surface 14s of the valve body 14 is stopped and the valve body 14 is closed by engaging the sealing surface 18(3). In addition, according to the inner circumferential sealing structure 16, the valve body 14 is closed with a smaller operating torque as compared with the case where the outer circumferential surface 14s of the valve body 14 is stopped by the locking sealing surface 18(3) and the valve body 14 is closed. As the method, either the first sealing surface 18(1) or the second sealing surface 18(2) can be selected. In addition, according to the inner peripheral sealing structure 16, when the fluid pressure exceeds 1.0 MPa, the outer peripheral surface 14s of the valve body 14 can be stopped and the position of closing the valve body 14 can be selected. At this time, even if an unexpectedly large operating torque is generated, the valve body 14 is locked by the locking protrusion 20 and stopped, and the valve body 14 will not be detached from the locking sealing surface 18 ( 3 ).

In addition, when the valve body 14 is overrun and locked on the locking protrusion 20 and stopped by the locking sealing surface 18(3), the sealing amount (the amount by which the valve body 14 crushes the inner peripheral sealing structure 16, that is, the valve body 14 The depth of entry) is larger, and the sealing performance is improved. However, the operating torque becomes larger accordingly. That is, if the valve body 14 is rotated at the set operating torque, the sealing performance can be maintained. In the adjustment operation of the valve body opening, there is no need to worry about the valve body 14 passing through and beyond the sealing portion, thereby improving workability. In addition, the sealing performance is lowered due to abrasion of the inner peripheral sealing structure 16 or the like (the sealing surface 19 after abrasion is shown in FIG. 5( a )). At this time, as shown by the 2-dot chain line in Fig. 5(a), by adjusting the valve body 14 in the direction of closing the valve body 14, the valve body 14 is rotated more than the tightly closed position (adjustment of the stopper of the driving part, etc.) , and it is easy to expect the recovery of airtight performance. Therefore, product life can be increased. In addition, in the prior art, in order to increase the life of the product, it is necessary to set a larger sealing amount in advance so that the sealing performance can be maintained even if it is worn. For example, as shown by the two-dot chain line in FIG. 5( b ), in order to form a larger sealing surface 113 , a larger sealing amount must be set in advance. Therefore, the necessary operating torque becomes large.

In addition, according to the inner peripheral sealing structure 16, the first sealing surface 18(1) and the second sealing surface 18( 2) The sealing surface 18(3) and the locking protrusion 20 are locked, so the operating torque is set so that the valve body 14 is stopped by the first sealing surface 18(1), the outer peripheral surface 14s of the valve body 14 is sure It comes into contact with the first sealing surface 18(1) and stops. That is, there is no case where the valve body 14 stops by touching the locking protrusion 20, and the outer peripheral surface 14s does not reach the first sealing surface 18(1).

Here, based on FIG. 5, the effect of the sealing surface being a concave curved surface shape will be described below. In Fig. 5, the X-axis shows the movement amount of the outer peripheral surface of the valve body. In FIGS. 5( a ) and ( b ), the oblique hatched portion is the portion crushed by the valve body in the sealing portion of the valve seat ring. In Fig. 5(c), the Y-axis shows the sealing amount. In FIG. 5( c ), the solid line shows the change of the sealing amount in the invention of the present application, and the 2-dot chain line shows the change of the sealing amount in the prior art. In Figure 5, DL is the tightly closed position. As shown in FIG. 5( c ), in the case of the invention of the present application, the sealing amount is gradually increased. On the other hand, in the case of the prior art, the amount of airtightness increases abruptly from 0 point. Therefore, compared with the prior art, the invention of the present application reduces the total amount of crushing of the sealing portion, and reduces the operating torque for rotating and closing the valve body.

(Valve seat structure 34) The function and effect of the valve seat structure 34 of the butterfly valve 10 of the present invention will be described below based on FIG. 3 . As described above, the continuous first sealing surface 18(1)ex, the continuous second sealing surface 18(2)ex, the continuous locking sealing surface 18(3)ex, and the continuous locking convex portion 20ex have relative to the valve body. 14. The side 32si of the curved shape of the valve body connecting surface 32 connected between the outer peripheral surface 14s and the valve body side contact surface 28 is a curved shape that is in close contact with each other as a whole. Therefore, when the valve body 14 is set to abut against the first sealing surface 18( 1 ) and is closed, the side 32si of the valve body 14 abuts against the continuous first sealing surface 18( 1 )ex of the valve seat ring 12 . That is, the whole of the side edge 32si of the curved shape is in contact with the continuous first sealing surface 18(1)ex of the curved shape. At this time, the valve body connection surface 32 is in contact with the valve seat connection surface 31 . Thereby, the contact area between the valve body 14 and the valve seat ring 12 can be enlarged, and the sealing performance can be improved. In addition, the side edge 32si of the valve body 14 enters the continuous first sealing surface 18(1)ex by a predetermined sealing amount. Therefore, the sealing performance can be improved. In the case where the valve body 14 is set to be in contact with the second sealing surface 18(2) and closed, and the case where the valve body 14 is set to be in contact with the latching sealing surface 18(3) and closed, it can be similarly improved. The sealing performance between the proximal side 32si of the valve body 14 and the contact surface 30 on the valve seat side. In particular, when it is set to abut against the latching sealing surface 18(3) and is closed, since the entire side 32si of the valve body 14 is in contact with the continuous latching protrusion 20, the contact area can be further enlarged, and the Thereby, the sealing performance is improved.

Next, based on FIG. 6 , the function and effect of the inner peripheral sealing structure (sealing portion) 16 and the connecting portion 35 of the valve seat side contact surface 30 in the valve seat structure 34 of the present invention will be described. In FIG.6(a), the connection part 35 is shown with oblique hatching. In FIG. 6( b ), the connecting portion 112 is shown with oblique hatching. In Fig. 6(a), the seal line (valve seat) VS is shown by a two-dot chain line. In FIG. 6( b ), the valve seat ridge line VS is shown by a 2-dot chain line. In the valve seat structure 34 of the present invention, since the inner circumferential sealing structure 16 and the valve seat side contact surface 30 are both concave shapes, the connecting portion 35 can smoothly connect the inner circumferential sealing structure 16 and the valve seat side contact surface. The shape of the face 30. Therefore, no additional operating torque is required in the connecting portion 35 . In contrast, in the prior art, as shown in FIG. 6( b ), the sealing portion 110 has a convex shape, whereas the valve seat side contact surface 114 has a concave shape. Therefore, in the connecting portion 112, a switching portion from convex to concave is required. Therefore, in order to smoothly connect the shape of the sealing portion 110 and the shape of the valve seat side contact surface 114, a shape 112ov having a larger width than the theoretically required shape 112 or width is required. Thereby, the required operating torque becomes large. In addition, since the switching portion is likely to cause poor sealing performance in terms of design, it is necessary to perform work such as checking the sealing performance with an actual machine. Therefore, in the prior art, many development man-hours are spent. However, the invention of the present application does not require such an operation, which facilitates development.

In addition, in the valve seat ring 12 of the present invention, the valve seat portion 300 for contacting the outer peripheral surface 30S of the valve body 14 may have a concave curved surface 28CC on the valve body 14 side as shown in FIGS. 8 and 9 . In this case, the valve body 14 is configured to rotate clockwise around the rotation center C1 of the valve stem, the outer peripheral surface 30S abuts against the concave curved surface 28CC, and the sealing amount SW of the outer peripheral surface 30S entering the concave curved surface 28CC gradually increases, as shown in FIG. 8 . stop in the closed position shown. The closed position means the position where the valve body 14 that was rotated completely stopped due to the resistance force from the valve seat protrusion 28CV. The closed position is determined by the rotational torque of the valve body 14, the elastic coefficient of the valve seat ring 12, and the size of the valve seat protrusion 28CV. As shown in the valve seat portion 300 shown in FIG. 8 , the sealing amount SW of the outer peripheral surface 30S entering the concave curved surface 28CC gradually increases. In the state, stop at the closed position. Therefore, the valve body 14 can be surely stopped at the closed position.

An example of a method for forming the concave curved surface 28CC will be described below. In the CAD (Computer Aided Design) screen, firstly draw a rotation track circle R1 such as the outer peripheral surface of the valve body, and draw a plurality of space circles whose radius is reduced at a certain distance relative to the rotation track circle R1. In addition, a straight line ST0 passing through the rotation center C1 and the point where the outer peripheral surface and the concave curved surface meet the concave curved surface at the sealed position are drawn, and a plurality of pitched straight lines passing through the rotation center C1 rotated counterclockwise at a certain angular pitch with respect to the straight line ST0 are drawn . Next, from among the intersections of the rotation locus circle R1 and the pitch circle, and the straight line ST0 and the pitch straight line, a specific intersection point that can form a concave curved surface is selected. Draw a spline curve passing through the selected intersection point, the spline curve is the concave surface 28CC.

An example of a method for forming the concave curved surface 28CC will be specifically described below with reference to FIG. 9 . Let the radius of the rotation locus circle R1 centered on the rotation center C1 of the valve body 14 be r1. First, the rotation locus circle R1 is drawn. Next, a plurality of circles whose radii are reduced at intervals of d mm (for example, 1 mm) with respect to the rotation locus circle R1 are drawn. That is, draw a circle R2 with a radius r1-d mm, a circle R3 with a radius r1-2 d mm, a circle R4 with a radius r1-3 d mm, a circle R5 with a radius r1-4 d mm, and The distance between the radius r1-5·d mm is the circle R0. The order in which the circles are drawn is not limited.

When the valve body 14 is in the closed position, θ (rotation angle of the valve body 14 )=0°. A straight line ST0 passing through the rotation center C1 and the point P0 of the concave curved surface 28CC in contact with the outer peripheral surface 30S at the sealing position is drawn. Next, a plurality of pitch straight lines passing through the rotation center C1 and rotated counterclockwise at an angle θ1 (eg, 3°) pitch with respect to ST0 are drawn. That is, the straight line ST0 passing through C1 when θ=0 is drawn, the distance straight line ST5 when θ=-θ1 is drawn, the distance straight line ST4 when θ=-2·θ1 is drawn, and the distance straight line ST3 when θ=-3·θ1 is drawn, and θ= The distance straight line ST2 when -4·θ1, and the distance straight line ST1 when θ=-5·θ1. The order in which the lines are drawn is not limited.

The intersection P5 of ST1 and the rotation locus circle R1, the intersection P4 of ST2 and R2, the intersection P3 of ST3 and R3, the intersection P2 of ST4 and R4, the intersection P1 of ST5 and R5, and the intersection P0 of ST0 and R0 are drawn. Next, a spline curve passing through these intersection points P5 and the like is drawn. This spline curve becomes a concave surface 28CC. P5 is the point at which the outer peripheral surface 30S of the valve body 14 begins to contact the concave curved surface 28CC of the valve seat ring 12 . For P5, the sealing volume SW0=0 mm, for P4, the sealing volume SW4=1·d mm, for P3, the sealing volume SW3=2·d mm, for P2, the sealing volume SW2=3·d mm, for P1, the sealing volume Quantity SW1=4・d mm, at P0, sealing quantity SW0=5・d mm. As mentioned above, an example of the formation method of the concave curved surface 28CC was demonstrated, but the formation method of the concave curved surface 28CC is not limited.

The embodiments of the invention of the present application have been described above, but the invention of the present application is not limited to the above-described embodiments, and can be implemented with appropriate modifications within the scope of producing the same functions and effects. For example, the valve of the present invention is not limited to a butterfly valve, and the type of valve is not limited. In addition, the butterfly valve invented in this application includes one-axis eccentric, two-axis eccentric and three-axis eccentric. Moreover, the structure provided with only one of the 1st sealing surface 18(1) and the 2nd sealing surface 18(2) may be sufficient. At this time, by setting the operating torque so that the valve body 14 is closed by either the first sealing surface 18(1) or the second sealing surface 18(2), it is possible to close the valve body 14 rather than the latching sealing surface 18(3). The lesser operating torque is turned off. Moreover, a concave surface may be formed by the 1st sealing surface 18(1), the 2nd sealing surface 18(2), and the latching sealing surface 18(3).

10: Butterfly valve (valve) 12: Seat Ring 12i: inner peripheral surface 14: valve body 14s: Peripheral surface 16: Inner perimeter airtight structure 18(1): 1st airtight surface 18(1)ex: Consecutive first airtight surface 18(2): Second airtight surface 18(2)ex: 2nd consecutive airtight surface 18(3): Buckle the airtight surface 18(3)ex: Continuously buckle the sealing surface 19: Airtight surface 20: Buckle the convex part 20ex: Continue to buckle the convex part 22: valve rod 24: Valve rod hole on the seat side 26: Valve rod hole on the valve body side 28: Valve body side contact surface 28CC: Concave Surface 28CV: Seat projection 30: Seat side contact surface 30S: Outer peripheral surface 31: Seat connection surface 32: Valve body connection surface 32si: side 33: Seat side contact surface 34: Valve seat structure 35: Connection part 100: Butterfly valve 102: valve box 104: Seat Ring 104i: Inner Week 106: valve body 106s: Peripheral surface 108: Flow Path 110: Airtight part 112: Connection part 112or: shape 112ov: Shape 113: Airtight surface 114: valve box 140:Fixed mechanism 300: valve seat C0: center of rotation C1: center of rotation DL: Closed position P0~P5: Intersection point R0: Spacing circle R1: Rotation track circle R2~R5: Spacing circle r1: radius ST0: Straight line ST1~ST5: Spacing straight line SW0~SW4: Airtight quantity VS: Closed Line (Valve Seat) VS: Seat Ridgeline θ: Rotation angle of valve body θ1: angle

FIG. 1 is a top view showing the inner peripheral airtight structure of the invention of the present application. Fig. 2 is a top sectional view for explaining the inner peripheral sealing structure shown in Fig. 1, the same figure (a) is a view showing the state that the valve body is about to abut against the valve seat ring, and the same figure (b) is a view showing the valve body abutting against the valve seat ring. The same figure (c) shows the state that the valve body is in contact with the second sealing surface, and the same figure (d) shows the state that the valve body is locked on the locking protrusion. map. The same figure (a) of FIG. 3 is a perspective view showing the valve seat structure of the invention of the present application, and the same figure (b) is a perspective view showing the valve body. FIG. 4 is a front cross-sectional view showing an example of a valve having an inner peripheral sealing structure and a valve seat structure according to the invention of the present application. Fig. 5 is a diagram for explaining the effect of the sealing surface being a concave curved surface shape, the same figure (a) is a schematic top view of the sealing surface of the invention of the present application, and the same figure (b) is a schematic diagram of the sealing surface of the prior art The top view, the same figure (c) is a graph comparing the sealing surface of the invention of the present application and the sealing surface of the prior art with respect to the sealing amount. 6 is a diagram for explaining the effect of the connecting portion between the inner peripheral sealing structure (sealing portion) and the contact surface on the valve seat side, the same figure (a) is a schematic perspective view showing the connecting portion of the invention of the present application, the same figure (b) is a schematic perspective view showing the connection part of the prior art. Figure 7 is a front sectional view showing the previous valve. FIG. 8 is a cross-sectional view of the cut-off portion along the line A-A showing another embodiment of the valve seat ring according to the present invention. FIG. 9 is a conceptual diagram for explaining an example of a method of forming the concave curved surface of the valve seat ring shown in FIG. 8 .

12: Seat Ring

12i: inner peripheral surface

14: valve body

14s: Peripheral surface

16: Inner perimeter airtight structure

18(1): 1st airtight surface

18(2): Second airtight surface

18(3): Buckle the airtight surface

20: Buckle the convex part

SW1~SW3: Airtight amount

Claims (5)

An inner circumference sealing structure, which is equipped with a valve seat ring and protrudes from the inner circumference surface of the valve seat ring, and is in contact with the outer circumference surface of the valve body for carrying fluid pressure, and has: The first sealing surface is a concave shape and can be abutted and stopped by the outer peripheral surface of the valve body; locking protrusions for locking the valve body to limit the rotation of the valve body; and A buckled sealing surface, when the valve body is buckled on the buckled convex portion, the outer peripheral surface of the valve body can abut and stop; and This inner peripheral sealing structure is comprised so that the said latching sealing surface may be larger than the said 1st sealing surface by the depth which the said outer peripheral surface of the said valve body penetrates, ie, the sealing amount. The inner circumference sealing structure of claim 1, wherein the first sealing surface, the locking sealing surface, and the locking locking surface are arranged in this order in a direction in which the outer circumferential surface of the valve body moves due to the rotation of the valve body. convex part. If the inner circumference of claim 1 or 2 is closed, it has: the second sealing surface, which is concave in shape, can be contacted and stopped by the outer peripheral surface of the valve body, and is continuous with the first sealing surface; and The first sealing surface, the second sealing surface, the locking sealing surface, and the locking protrusion are sequentially arranged in the direction in which the outer peripheral surface of the valve body moves due to the rotation of the valve body; The second sealing surface is configured to have a larger sealing amount than the first sealing surface; and The said latching sealing surface is comprised so that the sealing amount may be larger than the said 2nd sealing surface. A valve seat structure, which is equipped with a valve seat ring, and has: The inner perimeter airtight structure in the above claim 1 or 2; The valve rod hole on the valve seat side, into which the valve rod constituting the rotation center of the above valve body is inserted; The valve seat side abutting surface, which is arranged on the periphery of the valve seat side valve rod hole, and the valve body side abutting surface on the periphery of the valve body side valve rod hole provided by the valve body abuts; a continuous first sealing surface, which is continuous with the first sealing surface and extends to the abutting surface on the valve seat side; a continuous locking protrusion, which is continuous with the locking protrusion and extends to the abutment surface on the valve seat side; and a continuous buckle sealing surface, which is continuous with the buckle sealing surface and extends to the abutment surface on the valve seat side; and The continuous first sealing surface, the continuous locking protrusion, and the continuous locking sealing surface have the following shapes: when the valve body connecting surface is connected between the outer peripheral surface of the valve body and the valve body side abutting surface. When the sides are in contact, the whole is closely connected. A valve comprising the inner circumference sealing structure according to any one of the above claims 1 to 3.

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