KR102529296B1 - Inner sealing structure, seat structure and valve - Google Patents

Abstract

[Problem] An object of the present invention is to provide an inner circumferential sealing structure, a seat structure, and a valve capable of reducing an operating torque for closing a valve body.
[Solution] The outer circumferential surface 14s of the valve body 14, which is provided on the seat ring 12 of the butterfly valve 10, bulges from the inner circumferential surface 12i of the seat ring 12, and is loaded with fluid pressure The abutting inner circumferential sealing structure 16, the outer circumferential surface 14s of the valve body 14 abuts and the first sealing surface 18(1) capable of being stopped, and the locking convex portion to which the rotation of the valve body 14 is regulated 20 and the outer peripheral surface 14s are provided with an engaging sealing surface 18(3) capable of contacting and stopping, and rotation of the valve body 14 causes the outer peripheral surface 14s of the valve body 14 to In the moving direction, the first sealing surface 18 (1), the engaging sealing surface 18 (3), and the engaging convex portion 20 are arranged in this order, and the first sealing surface 18 (1) The locking sealing surface 18(3) was configured so that the sealing amount was larger than that.

Description

Inner sealing structure, seat structure and valve

The present invention relates to an inner sealing structure, a seat structure, and a valve constituting valves such as butterfly valves.

Conventionally, a butterfly valve (valve) has been used to close or open the flow of fluid. 7 shows a butterfly valve 100 as an example. The butterfly valve 100 includes a valve box 102, a seat ring 104, and a valve body 106. The valve box 102 and the seat ring 104 are combined by being engaged with each other. The valve body 106 is disposed in the flow path 108 of the seat ring 104 . The valve body 106 is configured to rotate around a rotational center C0. The seat ring 104 has a sealing portion (inner circumference sealing structure) 110 having a convex surface to which the valve element 106 abuts on the inner circumference 104i.

The valve element 106 rotates the valve element 106 to the locked position shown in FIG. 7 when the fluid is shut off (supply is cut off). In the butterfly valve 100, in the locked position, the outer circumferential surface 106s of the valve body 106 made of metal such as stainless steel is closed by the sealing portion 110 of the seat ring 104 made of an elastic member such as rubber. Entering (in Fig. 7, the sealing amount, which is the depth of entering, is represented by SW). In order to rotate the valve body 106 to the locked position for closing, a biasing force from the seal 110 and an operating torque against the fluid pressure are required. That is, when the SW is deep and the biasing force from the sealing portion 110 is large, the operating torque is large. However, as the operating torque increases, the scale of the rotation drive means for rotating the valve element 106 increases. In addition, there is a document related to a rotation driving means of a butterfly valve (see Patent Document 1). However, nothing related to the present invention.

Japanese Unexamined Patent Publication No. 2003-185047

An object of the present invention is to provide an inner circumferential sealing structure, a seat structure, and a valve capable of reducing operating torque for closing a valve body.

The inner circumferential sealing structure of the present invention is provided on the seat ring of a valve, bulges from the inner circumferential surface of the seat ring, and is an inner circumferential sealing structure in which the outer circumferential surface of the valve element to which fluid pressure is applied is in contact with,

a first sealing surface having a concave shape and capable of being stopped by abutting the outer circumferential surface of the valve body;

an engagement convex portion on which the valve body is engaged and rotation of the valve body is regulated;

Engagement sealing surface against which the outer circumferential surface of the valve body abuts when the valve body is engaged with the locking convex portion.

to provide,

The first sealing surface, the engaging sealing surface, and the engaging convex portion are disposed in the order in the direction in which the outer peripheral surface of the valve element moves by rotation of the valve element,

It is characterized in that the engaging sealing surface has a larger depth into which the outer circumferential surface of the valve body enters than the first sealing surface.

Further, in the inner circumferential sealing structure of the present invention, in the inner circumferential sealing structure, the first sealing surface, the engaging sealing surface, and the engaging convex are directed in a direction in which the outer circumferential surface of the valve body moves by rotation of the valve body. It is characterized in that they are arranged in the order of wealth.

Further, the inner circumferential sealing structure of the present invention is concave in the inner circumferential sealing structure, and the outer circumferential surface of the valve body is contactable and can stop, and is provided with a second sealing surface continuous to the first sealing surface. do,

The first sealing surface, the second sealing surface, the engaging sealing surface, and the engaging convex portion are arranged in the order in which the outer peripheral surface of the valve element moves in the direction in which the valve element rotates,

The second sealing surface is configured so that the sealing amount is larger than the first sealing surface,

It is characterized in that the locking sealing surface is configured so that the sealing amount is larger than that of the second sealing surface.

In addition, the seat structure of the present invention is a seat structure provided in a seat ring of a valve,

The inner circumferential sealing structure according to claim 1 or 2,

A seat-side valve rod hole into which a valve rod constituting the rotation center of the valve body is inserted;

A seat-side abutting surface provided around the seat-side valve stem hole and with which a valve body-side abutting surface around the valve body-side valve stem hole of the valve body comes into contact;

a continuous first sealing surface continuing to the first sealing surface and extending to the sheet side abutting surface;

a continuous engaging convex portion continuing to the engaging convex portion and extending to the sheet side abutting surface;

a continuous engagement sealing surface continuing to the engagement sealing surface and extending to the sheet side abutting surface;

The continuous first sealing surface, the continuously engaging convex portion, and the continuously engaging sealing surface are entirely in contact with the side of the valve element connecting surface connected between the outer circumferential surface of the valve element and the valve element side abutting surface. It is characterized in that it has a shape in close contact.

Moreover, the valve of this invention is characterized by including the said inner circumferential sealing structure.

According to the inner circumferential sealing structure of the present invention, since the outer circumferential surface of the valve body is provided with a first sealing surface capable of abutting and stopping, apart from the engaging sealing surface in which the outer circumferential surface of the valve body abuts and can stop, the first sealing The operating torque can be set such that it stops on the first sealing surface where the sealing amount is small and the biasing force from the seat ring is small, instead of stopping on the engagement sealing surface where the sealing amount is larger than that of the surface. Thereby, the valve element can be rotated and closed with a smaller operating torque, and the operating torque can be reduced. For this reason, the scale of the rotation drive means for rotating the valve body can be reduced. Further, when the fluid pressure is small, the sealing performance can be maintained even if the sealing force is stopped on the first sealing surface with a small sealing amount. Therefore, the sealing performance can be maintained while reducing the operating torque for closing the valve element.

1 is a plan view showing an inner circumferential sealing structure according to the present invention.
Fig. 2 is a plan sectional view for explaining the inner circumferential sealing structure shown in Fig. 1, Fig. 2 (a) is a view showing a state immediately before the valve body comes into contact with the seat ring, and Fig. 2 (b) is , Figure 3 (c) is a diagram showing a state in which the valve body is in contact with the first sealing surface, and FIG. It is a drawing showing the state caught in the convex part.
Fig. 3(a) is a perspective view showing a seat structure according to the present invention, and Fig. 3(b) is a perspective view showing a valve body.
Fig. 4 is a front sectional view showing one example of a valve having an inner circumferential sealing structure and a seat structure according to the present invention.
Fig. 5 is a view for explaining the effect of the sealing surface having a concave curved surface shape, Fig. 5 (a) is a schematic plan view showing the sealing surface related to the present invention, and Fig. 5 (b) is a prior art Fig. 5(c) is a graph comparing the sealing surface related to the present invention with the sealing surface related to the prior art with respect to sealing amount.
Fig. 6 is a view for explaining the action and effect of a joint between an inner circumferential sealing structure (sealing portion) and a sheet-side abutting surface, and Fig. 6 (a) is a schematic diagram showing a joint related to the present invention. It is a perspective view, and Fig. 6 (b) is a schematic perspective view showing a joint related to the prior art.
7 is a front sectional view showing a conventional valve.
Fig. 8 is a cross-sectional view taken along line A-A showing another embodiment of the seat ring according to the present invention.
Fig. 9 is a conceptual diagram for explaining an example of a method for forming the concave curved surface of the seat ring shown in Fig. 8;

EMBODIMENT OF THE INVENTION Embodiment of the inner circumferential sealing structure, seat structure, and butterfly valve (valve) which concerns on this invention is demonstrated based on drawing. 1 to 4, reference numeral 16 denotes the inner circumferential sealing structure of the present invention. 3 and 4, reference numeral 34 denotes the sheet structure of the present invention. 2 and 4, reference numeral 10 denotes the butterfly valve of the present invention.

(composition)

As shown in FIG. 2 , the butterfly valve 10 includes a valve box 114 and a seat ring 12 combined with the valve box 114 . The valve box 114 is made of, for example, aluminum (pure aluminum or aluminum alloy). The valve box 114 may be formed of a metal other than aluminum. The seat ring 12 is formed of, for example, EPDM (ethylene propylene rubber) or NBR (nitrile rubber), and may be formed of other rubber or resin. In addition, the butterfly valve 10 includes a valve body 14 disposed in the seat ring 12 and two valve rods 22 fixed to the upper and lower portions of the valve body 14 (Fig. 3 (b) ) is provided. The valve body 14 is substantially disk-shaped or substantially disk-shaped. The valve body 14 is made of, for example, stainless steel. The valve element 14 may be formed of metal other than stainless steel. The valve body 14 is provided with valve body side valve stem holes 26 (shown in FIG. 3(b) ) into which the valve stem 22 is inserted and fixed in the upper and lower portions. The valve stem 22 is made of stainless steel, and may be made of metal other than stainless steel. The valve rod 22 rotatably penetrates the valve box 114 and the seat side valve rod hole 24 of the seat ring 12 (shown in FIG. 3(a) ). The butterfly valve 10 is connected to the valve box 114 and has a fixing means 140 (shown in Fig. 4) fixed to a valve drive unit (not shown) having a rotation drive means. The fixing means 140 is made of aluminum, for example, and may be made of a metal other than aluminum.

(Inner circumferential sealing structure (sealing part) 16)

As shown in FIG. 1, the seat ring 12 has an inner circumferential sealing structure in which the outer circumferential surface 14s of the valve body 14, which bulges out from the inner peripheral surface 12i of the seat ring 12 and is loaded with fluid pressure, abuts ( 16) is provided. As shown in FIG. 4 , the inner circumferential sealing structure 16 is located at two places on the left and right of the seat ring 12 (a symmetrical position with the center of rotation C1 as an axis of symmetry) when viewed from the front. are provided in In the inner circumferential sealing structure 16, the outer circumferential surface 14s of the valve body 14 abuts and the first sealing surface 18(1), which can be stopped, and the outer circumferential surface 14s of the valve body 14 abut. It is stationary and has a second sealing surface 18(2) continuous to the first sealing surface 18(1). The first sealing surface 18 (1) and the second sealing surface 18 (2) have a concave curved surface shape in order to reduce the sealing amount even a little. In addition, the inner circumferential sealing structure 16 is stopped by contacting the outer peripheral surface 14s of the valve element 14, and the engagement sealing surface 18 (3) continuous to the second sealing surface 18 (2) and , the outer peripheral surface 14s of the valve element 14 is engaged, and the rotation of the valve element 14 is regulated. The outer circumferential surface 14s of the valve body 14 is configured so that it can stop by abutting against the engagement sealing surface 18(3) by being caught by the engagement convex portion 20. In addition, the inner circumferential sealing structure 16 has a first sealing surface 18 (1) and a second sealing surface in the direction in which the outer peripheral surface 14s of the valve body 14 moves by rotation of the valve body 14. (18(2)), the locking sealing surface 18(3), and the locking convex part 20 are arranged in this order.

In the inner circumference sealing structure 16, the engagement sealing surface 18(3) is deeper than the first sealing surface 18(1), and the sealing amount (th It is comprised so that the sealing amount of one sealing surface 18(1): SW1, and the sealing amount of an engagement sealing surface: SW3) may become large. In addition, 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). there is. Moreover, it is comprised so that the sealing amount may become larger in the locking sealing surface 18(3) than the 2nd sealing surface 18(2). That is, when stopping on the first sealing surface 18 (1), when stopping on the second sealing surface 18 (2), and when stopping on the locking sealing surface 18 (3), in the order of the sheet The bias force from the ring 12 increases. For this reason, the operation torque for closing the valve element 14 is stopped at the first sealing surface 18 (1), when stopped at the second sealing surface 18 (2), the engagement sealing surface 18 It increases in order of stopping in (3)).

(Seat Structure 34)

As shown in FIG. 3 , the seat ring 12 includes a seat structure 34 including two inner peripheral sealing structures 16 (right and left when viewed from the front). In Fig. 3 (a), dashed and one-dot lines indicating other than the center of rotation C1 indicate the center line (valley stripes) in the case of the sealing surface, and indicate the ridge line in the case of the convex portion. indicate In Fig. 3(a), a dotted line is a line representing a boundary between the inner circumferential sealing structure 16 and the sheet connecting surface 31 described later. In Fig. 3(b), the dotted line is a line representing the boundary between the outer circumferential surface 14s of the valve body 14 and the valve body connecting surface 32 described later, and the two-dot chain line is the valve body connecting surface It is the line which shows the boundary of (32) and the valve element side abutting surface 28 mentioned later. The seat structure 34 is provided in two places on the upper side and the lower side of the seat ring 12 in FIG. 4 .

As shown in Fig. 3(a), the seat structure 34 has a seat side valve rod hole 24 into which the valve rod 22 constituting the rotational center C1 of the valve element 14 is inserted. provide In addition, the seat structure 34 is provided around the seat side valve stem hole 24, and the valve body side abutting surface 28 around the valve body side valve stem hole 26 of the valve body 14 abuts. The edge has a sheet-side abutting surface 30 . In addition, the range of the broken line which shows the seat side abutting surface 30 in FIG. 3 (a) is the range which abuts on the valve body side abutting surface 28. In addition, the sheet structure 34 includes a continuous first sealing surface 18(1)ex continuing to the first sealing surface 18(1) and extending to the sheet side abutting surface 30, and a second sealing surface 18(1)ex. A continuous second sealing surface 18(2)ex continuing to the sealing surface 18(2) and extending to the sheet side abutting surface 30 is provided. In addition, the sheet structure 34 includes a continuous engagement sealing surface 18(3)ex which continues to the engagement sealing surface 18(3) and extends to the sheet side abutting surface 30, and an engagement convex portion ( 20) and a continuous engaging convex portion 20ex extending to the seat side abutting surface 30. The continuous first sealing surface 18(1)ex, the continuous second sealing surface 18(2)ex, the continuously engaging sealing surface 18(3)ex, and the continuously engaging convex portion 20ex are valve bodies. With respect to the curved side 32si of the valve body contact surface 32 connected between the outer circumferential surface 14s of (14) and the valve body side abutting surface 28, the curved shape to which the whole is in close contact when abutted. have The sealing amount of the continuous first sealing surface 18(1)ex, the continuous second sealing surface 18(2)ex, and the continuous locking sealing surface 18(3)ex is the sheet side abutting surface 30 ), it decreases as you go.

(action and effect)

(inner circumferential sealing structure 16)

The action and effect of the inner circumferential 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 circumferential sealing structure 16, the operating torque required to close the valve body 14 is in the order of increasing sealing amount, that is, the first sealing surface 18(1) having the smallest sealing amount SW1, the sealing amount being smaller than SW2. The second sealing surface 18(2) which is large and smaller than SW3, and the sealing surface 18(3) which is SW3 having the largest sealing amount become larger in that order. In addition, it is necessary to increase the sealing amount as the fluid pressure increases. For this reason, for example, when the fluid pressure is 0.5 MPa, the outer peripheral surface 14s of the valve body 14 is stopped at the first sealing surface 18 (1) to close the valve body 14, and the fluid pressure is In the case of 1.0 MPa, the outer peripheral surface 14s of the valve body 14 is stopped at the second sealing surface 18 (2) to close the valve body 14, and when the fluid pressure exceeds 1.0 MPa, the valve body 14 The operating torque can be set so that the outer peripheral surface 14s of ) is stopped at the engaging sealing surface 18 (3) to close the valve body 14. When the operating torque is set so that the valve body 14 is closed by stopping the outer circumferential surface 14s of the valve body 14 at the first sealing surface 18 (1), the operating torque becomes the smallest. For this reason, the valve body 14 can be closed with a small operating torque, and the scale of the rotation driving means of the valve body can be reduced. In addition, the height of the seat ring 12 and the valve body 14 is increased by bringing the outer peripheral surface 14s of the valve body 14 into contact with the first sealing surface 18 (1) of the small sealing amount SW1. ) life can be promoted. In this case, although the sealing amount SW1 is the smallest, since the fluid pressure received by the valve body 14 is the smallest at 0.5 MPa, it is sufficient for maintaining the sealing performance. Therefore, the sealing performance can be maintained while closing the valve body 14 with a small operating torque.

Further, according to the inner circumferential sealing structure 16, the fluid pressure is 1.0 MPa, and the outer peripheral surface 14s of the valve body 14 is stopped at the second sealing surface 18 (2) to close the valve body 14. Even when the operating torque is set, compared to the case where the operating torque is set such that the valve body 14 is closed by stopping the outer peripheral surface 14s of the valve body 14 at the engagement sealing surface 18(3), the operation is small. The valve element 14 can be closed by torque. Moreover, according to the inner circumferential sealing structure 16, compared with the case where the valve body 14 is closed by stopping the outer peripheral surface 14s of the valve body 14 at the engagement sealing surface 18 (3), the valve is operated with a smaller operating torque. As a method for closing the sieve 14, either the first sealing surface 18 (1) or the second sealing surface 18 (2) can be selected. Further, according to the inner circumferential sealing structure 16, when the fluid pressure is a high pressure exceeding 1.0 MPa, the outer peripheral surface 14s of the valve element 14 is stopped and the valve element 14 is closed as a position where the engagement sealing surface 18 (3)) can be selected. In this case, even if an unexpectedly large operating torque is generated, the valve element 14 is caught on the engaging convex portion 20 and stops, and the valve element 14 does not separate from the engaging sealing surface 18(3). does not exist.

In addition, when the valve body 14 overruns and is caught on the locking convex portion 20 and stops at the locking sealing surface 18(3), the sealing amount (the valve body 14 presses against the inner circumferential sealing structure 16 and crushes it) The drop amount, that is, the depth into which the valve body 14 enters) is large, and the sealing performance is improved. However, the operation torque increases by that amount. That is, if the valve element 14 is rotated with the set operating torque, the sealing performance can be maintained. In the operation of adjusting the degree of opening of the valve body, it is unnecessary to worry about the valve body 14 passing through the sealing portion and shaking off, and the workability is improved. In addition, the sealing performance deteriorates due to abrasion of the inner circumferential sealing structure 16 (Fig. 5(a) shows the sealing surface 19 after abrasion). At this time, as shown by the two-dot dashed line in Fig. 5 (a), by adjusting the valve body 14 to rotate more than (more) than the locked position in the closing direction of the valve body 14 (drive unit adjustment of the stopper, etc.), recovery of the sealing performance can be easily expected (expected). For this reason, product life can be lengthened. In addition, in the case of the prior art, in order to prolong the life of the product, it is necessary to set the sealing amount large so that the sealing performance can be maintained even if worn. For example, as shown by the dashed-two dotted line in Fig. 5(b), it is necessary to set the sealing amount large so as to form a larger sealing surface 113. For this reason, the required operating torque increases.

Further, according to the inner circumferential sealing structure 16, in the direction in which the outer peripheral surface 14s of the valve element 14 moves due to the rotation of the valve element 14, the first sealing surface 18 (1) and the second sealing Since the surface 18(2), the engagement sealing surface 18(3), and the engagement convex portion 20 are arranged in this order, the valve body 14 stops at the first sealing surface 18(1). When the operating torque is set so as to do so, the outer circumferential surface 14s of the valve body 14 abuts against the first sealing surface 18 (1) to be sure and stops. That is, the outer peripheral surface 14s does not reach the first sealing surface 18(1) because the valve element 14 comes into contact with the locking convex portion 20 and stops.

Here, the effect of the sealing surface having a concave curved surface shape will be described below based on FIG. 5 . In Fig. 5, the X axis represents the amount of movement of the outer circumferential surface of the valve body. In (a) and (b) of FIG. 5, the obliquely hatched portion is a portion crushed by the valve body in the sealing portion of the seat ring. In Fig. 5(c), the Y-axis represents the sealing amount. In Fig. 5(c), the solid line represents the change in sealing amount in the present invention, and the two-dot chain line represents the change in sealing amount in the prior art. 5, DL is a locked position. As shown in Fig. 5(c), in the case of the present invention, the sealing amount gradually increases. In contrast, in the case of the prior art, the sealing amount rapidly increases from zero. For this reason, compared with the prior art, in the present invention, the total amount of crushing the sealing portion is small, and the operating torque for rotating and closing the valve body is small.

(Seat Structure 34)

The actions and effects of the 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 continuously engaging sealing surface 18(3)ex, and the continuous engaging convex portion 20ex ) is the entirety when contacted with respect to the curved side 32si of the valve body contact surface 32 connected between the outer peripheral surface 14s of the valve body 14 and the valve body side abutting surface 28. It has a curved shape that adheres to it. For this reason, when the valve body 14 is set to be closed by bringing it into contact with the first sealing surface 18 (1), the side edge 32si of the valve body 14 is the first continuation of the seat ring 12. It abuts on the sealing surface 18(1)ex. That is, the entire curved side edge 32si abuts against the curved continuous first sealing surface 18(1)ex. At this time, the valve element contact surface 32 abuts against the seat contact surface 31 . Thereby, the contact area between the valve body 14 and the seat ring 12 can be widened, and sealing performance can be improved. Further, the side edge 32si of the valve body 14 enters the continuous first sealing surface 18(1)ex with a predetermined sealing amount. For this reason, sealing performance can be improved. When the valve element 14 is set to close by abutting against the second sealing surface 18(2), and when the valve element 14 is set to abut against the locking sealing surface 18(3) to close In this case as well, the sealing performance between the vicinity of the side edge 32si of the valve body 14 and the seat side abutting surface 30 can be improved in the same way. In particular, when it is set to close by contacting the engagement sealing surface 18(3), since the entire side edge 32si of the valve element 14 abuts on the continuously engaging convex portion 20, it is more abutting. By making the area wider, the sealing performance can be further improved.

Next, based on FIG. 6, the effect of the joint 35 between the inner circumferential sealing structure (sealing portion) 16 and the sheet side abutting surface 30 in the sheet structure 34 of the present invention is examined. Explain. In (a) of FIG. 6, the joint part 35 is indicated by hatched lines. In (b) of FIG. 6, the joint part 112 is indicated by hatched lines. In Fig. 6 (a), the sealing line (valve seat) VS is indicated by a two-dot chain line. In Fig. 6(b), the valve seat ridge line VS is indicated by a two-dot chain line. In the seat structure 34 of the present invention, since both the inner circumferential sealing structure 16 and the seat side abutting surface 30 are concave, the inner circumferential sealing structure 16 and the seat side abutting surface 35 are formed at the joint portion 35. The shape of the contact surface 30 can be smoothly joined. For this reason, in the joint part 35, unnecessary operating torque is not required. In contrast, in the prior art, as shown in Fig. 6(b), the sealing portion 110 has a convex shape, whereas the sheet side abutting surface 114 has a concave shape. For this reason, in the joint portion 112, a transition portion from convex to concave is required. Therefore, in order to be able to smoothly connect the shape of the sealing portion 110 and the shape of the sheet side abutting surface 114, a shape 112ov having a larger width than the theoretically required shape 112or is required. As a result, the required operating torque is increased. In addition, since this switching part tends to be a design cause of poor sealing performance, work such as checking sealing performance in an actual machine was necessary. For this reason, in the case of the prior art, many development man-hours were required. However, the present invention eliminates the need for such an operation, leading to facilitation of development.

In addition, in the seat ring 12 according to the present invention, the seat portion 300 with which the outer peripheral surface 30S of the valve element 14 abuts is, as shown in Figs. 8 and 9, the valve element 14 side. You may have a concave curved surface 28CC. In this case, the valve body 14 rotates clockwise around the rotational center C1 of the valve rod, the outer circumferential surface 30S abuts against the concave curved surface 28CC, and the outer circumferential surface 30S turns to the concave curved surface 28CC. It is comprised so that it may stop at the sealing position shown in FIG. 8 after entering sealing amount SW gradually increases. The sealing position is a position where the rotating valve element 14 is completely stopped by the resistance force from the seat convex portion 28CV. The sealing position is determined by the rotational torque of the valve element 14, the modulus of elasticity of the seat ring 12, and the dimensions of the seat convex portion 28CV. In the case of the 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, and the resistance force from the concave curved surface 28CC causes the valve body 14 ) gradually decreases and stops at the sealing position in a sufficiently reduced state. For this reason, the valve element 14 can be reliably stopped at the sealing position.

An example of a method of forming the concave curved surface 28CC will be described below. On the CAD screen, first, for example, a rotation locus circle R1 of the outer circumferential surface of the valve body is drawn, and a plurality of pitch circles whose radii become smaller at a constant pitch are drawn with respect to the rotation locus circle R1. In addition, draw a straight line ST0 that passes through (passes through) the center of rotation C1 and the point where the outer peripheral surface contacts the concave curved surface at the sealing position, and rotates at a constant angular pitch in a counterclockwise direction (counterclockwise) with respect to the straight line ST0. , draw a plurality of pitch straight lines passing through the center of rotation C1. Next, a predetermined intersection at which a concave surface can be formed is selected from among the intersections of the rotational locus circle R1 and the pitch circle, and the straight line ST0 and the pitch line. A spline curve passing through the selected intersection point is drawn, and this spline curve becomes a concave surface (28CC).

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

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

Plot the intersection point P5 between ST1 and the circle of rotation R1, the intersection point P4 between ST2 and R2, the intersection point P3 between ST3 and R3, the intersection point P2 between ST4 and R4, the intersection point P1 between ST5 and R5, and the intersection point P0 between ST0 and R0. (systematic) Next, a spline curve passing through these intersection points P5 and the like is drawn. This spline curve becomes the concave curved 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 seat ring 12 . In P5, the sealing amount SW0 = 0 mm, in P4, the sealing amount SW4 = 1·dmm, in P3, the sealing amount SW3 = 2·dmm, and in P2, the sealing amount SW2 = 3·dmm dmm, in P1, the sealing amount SW1 = 4·dmm, and in P0, the sealing amount SW0 = 5·dmm. As mentioned above, although one example of the formation method of the concave curved surface 28CC was demonstrated, the formation method of the concave curved surface 28CC is not limited.

As mentioned above, the embodiment of the present invention has been described, but the present invention is not limited to the above-described embodiment, and can be implemented with appropriate changes within the range where the same action and effect occur. 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 of the present invention includes one-axis eccentricity, two-axis eccentricity, and three-axis eccentricity. Moreover, the structure provided with only either one of the 1st sealing surface 18 (1) and the 2nd sealing surface 18 (2) may be sufficient. In this case, by setting an operating torque so that either one of the first sealing surface 18 (1) and the second sealing surface 18 (2) closes the valve element 14, the engagement sealing surface 18 It can be closed with a smaller operating torque than closing in (3)). Moreover, you may form a concave surface by the 1st sealing surface 18 (1), the 2nd sealing surface 18 (2), and the locking sealing surface 18 (3).

10: Butterfly valve (valve)
12: seat ring
12i: Give me
14: valve body
14s: outer circumference
16: Inner circumferential sealing structure
18(1): first sealing surface
18(1)ex: Continuous first sealing surface
18(2): 2nd sealing surface
18(2)ex: Continuous second sealing surface
18(3): Engagement sealing surface
18(3)ex: Continuous engagement sealing surface
20: Catch convex portion
20ex: Convex section for continuous engagement
22: valve rod
24: seat side valve stem hole
26: Valve body side valve stem hole
28: Valve body side abutting surface
30: seat side contact surface
31: seat contact surface
32: Valve element connecting surface
32si: side
33: seat side contact surface
34: Sheet structure
C1： Center of Rotation
SW1, SW2, SW3: Sealing amount

Claims (7)

An inner circumferential sealing structure provided on the seat ring of the valve, bulging from the inner circumferential surface of the seat ring, and contacting the outer circumferential surface of the valve body to which fluid pressure is applied,
a first sealing surface having a concave shape and capable of being stopped by abutting the outer circumferential surface of the valve body;
an engagement convex portion on which the valve body is engaged and rotation of the valve body is regulated;
An engagement sealing surface provided adjacent to the engagement convex portion and capable of stopping the outer circumferential surface of the valve body abutting when the valve body is engaged with the engagement convex portion.
to provide,
The inner circumferential sealing structure configured such that a sealing amount, which is a depth into which the outer circumferential surface of the valve body enters, is larger on the engaging sealing surface than on the first sealing surface. According to claim 1,
The inner circumferential sealing structure in which the first sealing surface, the locking sealing surface, and the locking convex portion are arranged in this order in a direction in which the outer peripheral surface of the valve body moves by rotation of the valve body. According to claim 1,
It has a concave shape, the outer circumferential surface of the valve body can contact and stop, and has a second sealing surface continuous to the first sealing surface,
The first sealing surface, the second sealing surface, the engaging sealing surface, and the engaging convex portion are arranged in the order in which the outer peripheral surface of the valve element moves in the direction in which the valve element rotates,
The second sealing surface is configured so that the sealing amount is larger than the first sealing surface,
The inner circumferential sealing structure configured so that the sealing amount is larger on the locking sealing surface than on the second sealing surface. A seat structure provided in the seat ring of the valve,
The inner circumferential sealing structure according to claim 1 or 2,
A seat-side valve rod hole into which a valve rod constituting the rotation center of the valve body is inserted;
A seat-side abutting surface provided around the seat-side valve stem hole and with which a valve body-side abutting surface around the valve body-side valve stem hole of the valve body comes into contact;
a continuous first sealing surface continuing to the first sealing surface and extending to the sheet side abutting surface;
a continuous engaging convex portion continuing to the engaging convex portion and extending to the sheet side abutting surface;
a continuous engagement sealing surface continuing to the engagement sealing surface and extending to the sheet side abutting surface;
The continuous first sealing surface, the continuously engaging convex portion, and the continuously engaging sealing surface are entirely in contact with the side of the valve element connecting surface connected between the outer circumferential surface of the valve element and the valve element side abutting surface. A sheet structure having a shape that is in close contact with each other. delete A seat structure provided in the seat ring of the valve,
A first sealing surface, which bulges from the inner circumferential surface of the seat ring and is in contact with the outer circumferential surface of the valve body to which fluid pressure is loaded, has a concave shape, and the outer circumferential surface of the valve body can contact and stop, and the valve body An engagement convex portion that is engaged and the rotation of the valve body is regulated, and an engagement sealing surface capable of contacting and stopping the outer circumferential surface of the valve body when the valve body is engaged with the engagement convex portion. Also, the engagement sealing surface is configured such that the sealing amount, which is the depth at which the outer peripheral surface of the valve body enters, is increased, and in the direction in which the outer peripheral surface of the valve body moves by rotation of the valve body, the first sealing surface; an inner circumferential sealing structure disposed in the order of the engagement sealing surface and the engagement convex portion;
A seat-side valve rod hole into which a valve rod constituting the rotation center of the valve body is inserted;
A seat-side abutting surface provided around the seat-side valve rod hole and with which a valve body-side abutting surface around the valve element-side valve rod hole of the valve body comes into contact;
a continuous first sealing surface continuing to the first sealing surface and extending to the sheet side abutting surface;
a continuous engaging convex portion continuing to the engaging convex portion and extending to the sheet side abutting surface;
a continuous engagement sealing surface continuing to the engagement sealing surface and extending to the sheet side abutting surface;
The continuous first sealing surface, the continuously engaging convex portion, and the continuously engaging sealing surface are entirely in contact with the side of the valve element connecting surface connected between the outer circumferential surface of the valve body and the valve body side abutting surface. A sheet structure having a shape that is in close contact with each other. A valve comprising the inner circumferential sealing structure according to claim 1.

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