KR20220012782A - Inner perimeter sealing structure, seat structure and valve - Google Patents

Abstract

[PROBLEMS] An object of the present invention is to provide an inner peripheral sealing structure, a seat structure, and a valve capable of reducing the operating torque for closing the valve body.
[Solution means] The outer circumferential surface 14s of the valve body 14 provided in the seat ring 12 of the butterfly valve 10 and bulging from the inner circumferential surface 12i of the seat ring 12 and to which the fluid pressure is applied. A first sealing surface 18(1) capable of stopping by contacting the outer peripheral surface 14s of the valve body 14 with the abutting inner circumferential sealing structure 16, and a locking convex portion in which rotation of the valve body 14 is restricted. 20 and the outer circumferential surface 14s are brought into contact with the locking sealing surface 18(3) capable of being stopped, and the outer circumferential surface 14s of the valve body 14 is rotated by rotation of the valve body 14. In the moving direction, the first sealing surface 18(1), the locking sealing surface 18(3), and the locking convex portion 20 are arranged in this order, and the first sealing surface 18(1)) It was comprised so that the sealing amount of the side of the latching sealing surface 18 (3) might become larger than that.

Description

Inner perimeter sealing structure, seat structure and valve

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

BACKGROUND ART Conventionally, a butterfly valve (valve) has been used to close or open a flow of a fluid. In Fig. 7, as an example, a butterfly valve 100 is shown. 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 engaged with each other and are combined. 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 the rotation center C0. The seat ring 104 has, on the inner periphery 104i, a sealing portion (inner periphery sealing structure) 110 in the shape of a convex surface to which the valve body 106 abuts.

The valve body 106 rotates the valve body 106 to the locking position shown in FIG. 7, when locking the fluid (supply is cut off). In the butterfly valve 100, in the locked position, the outer peripheral surface 106s of the valve body 106 made of a metal such as stainless steel is connected to a sealing portion 110 of a seat ring 104 made of an elastic member such as rubber. It enters (in FIG. 7, the sealing amount which is an entrance depth is represented by SW). In order to rotate the valve body 106 to the locked position to close, a biasing force from the sealing portion 110 and an operating torque against the fluid pressure are required. That is, when SW is deep and the biasing force from the sealing part 110 becomes large, the operation torque becomes large. However, as the operating torque increases, the scale of the rotational driving means for rotating the valve body 106 becomes large. Also, there is a document relating to a rotation driving means of a butterfly valve (see Patent Document 1). However, nothing is related to the present invention.

Japanese Patent Laid-Open No. 2003-185047

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

The inner circumferential sealing structure of the present invention is an inner circumferential sealing structure provided in the seat ring of a valve, bulging from the inner circumferential surface of the seat ring, and contacting the outer circumferential surface of the valve body to which the fluid pressure is applied,

a first sealing surface having a concave shape and capable of stopping by contacting the outer circumferential surface of the valve body;

a locking convex part to which the valve body is caught and rotation of the valve body is regulated;

When the valve body is caught by the locking convex portion, the locking sealing surface against which the outer peripheral surface of the valve body abuts.

to provide

In the direction in which the outer peripheral surface of the valve body moves by rotation of the valve body, the first sealing surface, the locking sealing surface, and the locking convex part are arranged in this order,

It is characterized in that the depth into which the outer peripheral surface of the valve body enters is larger in the locking sealing surface than in the first sealing surface.

Further, in the inner circumferential sealing structure of the present invention, in the inner circumferential sealing structure, in the direction in which the outer peripheral surface of the valve body moves by rotation of the valve body, the first sealing surface, the engaging sealing surface, and the engaging convex It is characterized in that it is arranged in the order of parts.

In addition, the inner circumferential sealing structure of the present invention has a concave shape in the inner circumferential sealing structure, the outer circumferential surface of the valve body abuts and can be stopped, and includes a second sealing surface continuous to the first sealing surface. do,

The first sealing surface, the second sealing surface, the locking sealing surface, and the locking convex part are disposed in the order of the first sealing surface, the second sealing surface,

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

It is characterized in that the locking sealing surface is configured such 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 equipped with 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 rod hole and abutting against a valve body-side abutting surface around the valve body-side valve rod hole of the valve body;

a continuous first sealing surface continuous to the first sealing surface and extending to the seat-side abutting surface;

a continuous engaging convex portion continuous to the engaging convex portion and extending to the seat-side abutting surface;

and a continuous locking sealing surface continuous to the locking sealing surface and extending to the seat side abutting surface;

The continuous first sealing surface, the continuous engaging convex portion, and the continuous engaging sealing surface are the entire side of the valve body connecting surface connected between the outer peripheral surface of the valve body and the valve body side abutting surface when in contact. It is characterized in that it has a shape that is in close contact.

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

According to the inner circumferential sealing structure of the present invention, since the outer circumferential surface of the valve body has a first sealing surface capable of abutting and stopping separately from the locking sealing surface capable of abutting on the outer circumferential surface of the valve body, the first sealing The operating torque can be set so that it does not stop on the latching sealing surface where the sealing amount is larger than the surface, but stops on the first sealing surface where the sealing amount is small and the biasing force from the seat ring is smaller. Thereby, the valve body can be rotated and closed with a smaller operating torque, and an operating torque can be reduced. For this reason, the scale of the rotation drive means for rotating a valve body can be reduced. In addition, when the fluid pressure is small, the sealing performance can be maintained even if it stops at the first sealing surface with a small sealing amount. Therefore, sealing performance can be maintained, reducing the operating torque for closing a valve body.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the inner peripheral sealing structure which concerns on this 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 abuts against the seat ring, Fig. 2 (b) is , is a view showing a state in which the valve body abuts against the first sealing surface, Fig. 3 (c) is a view showing a state in which the valve body abuts against the second sealing surface, and Fig. 3 (d) is the valve body is engaged It is a figure which shows the state which caught on the convex part.
Fig. 3(a) is a perspective view showing the seat structure according to the present invention, and Fig. 3(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 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 shape, Fig. 5 (a) is a schematic plan view showing the sealing surface according to the present invention, Fig. 5 (b) is a prior art It is a schematic plan view showing the sealing surface related to , and FIG. 5C is a graph comparing the sealing surface according to the present invention and the sealing surface according to the prior art with respect to the sealing amount.
Fig. 6 is a view for explaining the effect of the joint between the inner circumferential sealing structure (sealed portion) and the seat-side abutting surface, and Fig. 6 (a) is a schematic diagram showing the joint according to the present invention. It is a perspective view, and (b) of FIG. 6 is a schematic perspective view which shows the joint which concerns on the prior art.
7 is a front cross-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 a concave curved surface of the seat ring shown in Fig. 8;

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

(composition)

The butterfly valve 10 is provided with the valve box 114 and the seat ring 12 combined with the valve box 114, as shown in FIG. 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 arranged 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 shown in). The valve body 14 has a substantially disc shape or a substantially disc shape. The valve body 14 is formed of, for example, stainless steel. The valve body 14 may be formed of a metal other than stainless steel. The valve body 14 is provided with the valve body side valve-bar hole 26 (shown in FIG.3(b)) in which the valve-bar 22 is inserted and fixed in the upper part and the lower part. The valve rod 22 is formed of stainless steel, and may be formed of a metal other than stainless steel. The valve rod 22 is rotatably penetrated through the seat side valve rod hole 24 (shown in Fig. 3A) of the valve box 114 and the seat ring 12 . The butterfly valve 10 is provided with fixing means 140 (shown in Fig. 4) connected to the valve box 114 and fixed to a valve drive unit (not shown) having a rotation drive means. The fixing means 140 is formed of, for example, aluminum, and may be formed of a metal other than aluminum.

(Inner periphery sealing structure (sealing part) (16))

As shown in FIG. 1, the seat ring 12 swells from the inner peripheral surface 12i of the seat ring 12, and an inner peripheral sealing structure in which the outer peripheral surface 14s of the valve body 14 to which the fluid pressure is applied abuts ( 16) is provided. As shown in Fig. 4, the inner circumferential sealing structure 16 has two left and right positions of the seat ring 12 (a symmetrical position with the rotational center C1 as the axis of symmetry) when viewed from the front. is provided in The inner peripheral sealing structure 16 has a first sealing surface 18(1) capable of being stopped by abutting the outer peripheral surface 14s of the valve body 14, and the outer peripheral surface 14s of the valve body 14 being in contact with each other. 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 peripheral sealing structure 16 has an engagement sealing surface 18(3) continuous to the second sealing surface 18(2) and the outer peripheral surface 14s of the valve body 14 contacting and stopping, and , the outer peripheral surface 14s of the valve body 14 is engaged, and the engagement convex part 20 by which rotation of the valve body 14 is regulated is provided. The outer circumferential surface 14s of the valve body 14 is configured to abut against the locking sealing surface 18(3) by being caught by the locking convex portion 20 so that it can be stopped. Moreover, the inner peripheral sealing structure 16 has the 1st sealing surface 18(1) and the 2nd sealing surface in the direction in which 14 s of outer peripheral surfaces of the valve body 14 move by rotation of the valve body 14. (18(2)), the locking sealing surface 18(3), and the locking convex part 20 are arrange|positioned in this order.

In the inner circumferential sealing structure 16, the sealing surface 18(3) is the depth into which the outer circumferential surface 14s of the valve body 14 enters rather than the first sealing surface 18(1). It is comprised so that the sealing amount of 1 sealing surface 18 (1): SW1, and the sealing amount of the lock|locking sealing surface: SW3) may become large. Moreover, the 2nd sealing surface 18(2) side is comprised so that the sealing amount (sealing amount of the 2nd sealing surface 18(2): SW2) may become larger than the 1st sealing surface 18(1), have. Moreover, the direction of the latching sealing surface 18(3) rather than the 2nd sealing surface 18(2) is comprised so that the sealing amount may become large. That is, when stopping at the 1st sealing surface 18(1), when stopping at the 2nd sealing surface 18(2), in the case of stopping at the latching sealing surface 18(3), the sheet The biasing force from the ring 12 increases. For this reason, when stopping the operating torque for closing the valve body 14 by the 1st sealing surface 18(1), when stopping by the 2nd sealing surface 18(2), the latching sealing surface 18 It increases in the order of the case of stopping in (3)).

(Seat Structure (34))

As shown in FIG. 3, the seat ring 12 is provided with the seat structure 34 containing the inner peripheral sealing structure 16 of two (left and right in a front view). In Fig. 3(a) , dashed-dotted lines indicating other than the rotation center C1 indicate a central line (valley stripes) in the case of a sealing surface, and a ridge line in the case of a convex portion. indicates. In addition, in Fig.3 (a), a dotted line is a line which shows the boundary of the inner peripheral sealing structure 16 and the sheet|seat connection surface 31 mentioned later. In FIG.3(b), a dotted line is a line which shows the boundary between the outer peripheral surface 14s of the valve body 14, and the valve body connection surface 32 mentioned later, and the dashed-dotted line is a valve body connection surface. It is a line which shows the boundary between (32) and the valve body side contact surface 28 mentioned later. The seat structure 34 is provided in two places of the upper side and the lower side of the seat ring 12 in FIG.

The seat structure 34 has a seat side valve rod hole 24 into which the valve rod 22 constituting the rotation center C1 of the valve body 14 is inserted, as shown in FIG. 3A . be prepared Further, the seat structure 34 is provided around the seat side valve rod hole 24, and the valve body side abutting surface 28 around the valve body side valve rod hole 26 of the valve body 14 comes into contact with each other. It has a seat-side abutting surface (30). In addition, in Fig.3 (a), the inside of the range of the broken line which shows the seat side contact surface 30 is the range which contact|abuts the valve body side contact surface 28. In addition, in FIG. Further, the sheet structure 34 has a continuous first sealing surface 18(1)ex continuous to the first sealing surface 18(1) and extending to the seat-side abutting surface 30, and a second A continuous second sealing surface 18(2) ex that is continuous to the sealing surface 18(2) and extends to the seat-side abutting surface 30 is provided. Further, the seat structure 34 includes a continuous locking sealing surface 18(3)ex that is continuous to the locking sealing surface 18(3) and extending to the seat side abutting surface 30, and a locking convex portion ( 20) and a continuous engaging convex portion 20ex extending to the seat-side abutting surface 30 is provided. The continuous first sealing surface 18(1)ex, the continuous second sealing surface 18(2)ex, the continuous engaging sealing surface 18(3)ex, and the continuous engaging convex portion 20ex are the valve elements. With respect to the curved side 32si of the valve body connecting surface 32 connected between the outer peripheral surface 14s of (14) and the valve body side contacting surface 28, a curved shape in 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 engaging sealing surface 18(3)ex is determined by the seat side abutting surface 30 ) decreases as the

(action and effect)

(Inner perimeter 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 increases in the order of the sealing amount, that is, the first sealing surface 18(1) with the smallest sealing amount SW1, and the sealing amount is greater than SW2. The second sealing surface 18(2), which is large and smaller than SW3, increases in the order of the locking sealing surface 18(3) having the largest sealing amount SW3. Moreover, it is necessary to make the sealing amount large, so that a fluid pressure is large. For this reason, for example, when the fluid pressure is 0.5 MPa, 14 s of outer peripheral surfaces of the valve body 14 are stopped by the 1st sealing surface 18 (1), the valve body 14 is closed, and the fluid pressure In the case of 1.0 MPa, when the outer peripheral surface 14s of the valve body 14 is stopped at the 2nd sealing surface 18 (2), the valve body 14 is closed, and when a fluid pressure exceeds 1.0 MPa, the valve body 14 ), an operating torque can be set so that the valve body 14 may be closed by stopping 14 s of outer peripheral surfaces at the latching sealing surface 18 (3). When the operating torque is set so that 14 s of outer peripheral surfaces of the valve body 14 may be stopped by the 1st sealing surface 18 (1) and the valve body 14 may be closed, the operating torque becomes the smallest. For this reason, the valve body 14 can be closed by a small operating torque, and the scale of the rotation drive means of a valve body can be reduced. Moreover, by making 14 s of outer peripheral surfaces of the valve body 14 abut against the 1st sealing surface 18 (1) of the small sealing amount SW1, the seat ring 12 and the height of the valve body 14 are high. ) can improve lifespan. In this case, although the sealing amount SW1 is the smallest, since the fluid pressure which the valve body 14 receives is the smallest at 0.5 MPa, it is sufficient for sealing performance maintenance. Therefore, while closing the valve body 14 by a small operating torque, sealing performance can be maintained.

Moreover, according to the inner peripheral sealing structure 16, the fluid pressure is 1.0 MPa, so that 14 s of outer peripheral surfaces of the valve body 14 are stopped at the 2nd sealing surface 18 (2), so that the valve body 14 is closed. Even when the operating torque is set, small operation compared to the case where the operating torque is set so that the outer peripheral surface 14s of the valve body 14 is stopped at the locking sealing surface 18(3) to close the valve body 14. The valve body 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 by the latching sealing surface 18(3), the valve with a small operating torque. As a method for closing the sieve 14, either one of the first sealing surface 18(1) or the second sealing surface 18(2) can be selected. Moreover, according to the inner circumferential sealing structure 16, when the fluid pressure is a high pressure exceeding 1.0 MPa, it is a position which stops the outer peripheral surface 14s of the valve body 14 and closes the valve body 14, The latching sealing surface 18 (3)) can be selected. In this case, even if an unexpectedly large operating torque is generated, the valve body 14 is caught by the engagement convex portion 20 and stops, and the valve body 14 is not separated from the engagement sealing surface 18 (3). none.

In addition, when the valve body 14 overruns and catches the locking convex portion 20 and stops at the locking sealing surface 18(3), the sealing amount (the valve body 14 presses the inner circumferential sealing structure 16 and crushes it) The drop amount, ie, the depth into which the valve body 14 enters, is large, and the sealing performance is improved. However, the operation torque increases by that much. That is, if the valve body 14 is rotated with the set operating torque, sealing performance can be maintained. In the operation of adjusting the degree of opening of the valve body, it is not necessary to worry about the valve body 14 passing the sealing part and throwing it away (removing), and workability is improved. Moreover, the sealing performance falls by abrasion of the inner peripheral sealing structure 16, etc. (The sealing surface 19 after abrasion is shown in Fig.5 (a)). At this time, as shown by the dashed-dotted line in FIG. 5A , in the direction in which the valve body 14 is closed, by adjusting the valve body 14 to rotate excessively (more) than the locking position (the driving part stopper adjustment, etc.), and recovery of sealing performance can be easily expected (anticipated). For this reason, product life can be lengthened. Further, in the case of the prior art, in order to prolong the product life, it is necessary to set the sealing amount large so that the sealing performance can be maintained even if worn out. For example, it is necessary to set the sealing amount large so that the larger sealing surface 113 may be formed as shown by the dashed-two dotted line in FIG.5(b). For this reason, the required operating torque becomes large.

Moreover, according to the inner peripheral sealing structure 16, the 1st sealing surface 18(1) and the 2nd sealing surface in the direction in which 14 s of outer peripheral surfaces of the valve body 14 move by rotation of the valve body 14. Since the surface 18(2), the locking sealing surface 18(3), and the locking 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 that it may stop, 14 s of outer peripheral surfaces of the valve body 14 abut against the 1st sealing surface 18 (1) reliably. That is, the valve body 14 does not come into contact with the locking convex portion 20 and stop, and the outer peripheral surface 14s does not reach the first sealing surface 18 ( 1 ).

Here, the operation and effect by the sealing surface being concave curved surface shape is demonstrated below based on FIG. In Fig. 5, the X-axis represents the amount of movement of the outer peripheral surface of the valve body. In Fig.5 (a) and (b), the hatched part is the part which is crushed by the valve body in the sealing part of a seat ring. In FIG.5(c), the Y-axis represents the sealing amount. In FIG.5(c), the solid line shows the change of the sealing amount in this invention, and the dashed-dotted line shows the change of the sealing amount in the prior art. In Fig. 5, DL is the locked position. As shown in FIG.5(c), in the case of this invention, the sealing amount increases gradually. On the other hand, in the case of the prior art, the sealing amount increases rapidly from 0 point. For this reason, compared with the prior art, in this invention, there is little total amount which crushes a sealing part, and the operation torque for rotating and closing a valve body decreases.

(Seat Structure (34))

The action and effect of the seat structure 34 of the butterfly valve 10 of this invention are demonstrated below based on FIG. As described above, the continuous first sealing surface 18(1)ex, the continuous second sealing surface 18(2)ex, the continuous engaging sealing surface 18(3)ex, and the continuous engaging convex portion 20ex ) is the curved side edge 32si of the valve body connecting face 32 connected between the outer circumferential surface 14s of the valve body 14 and the valve body side abutting face 28, when in contact with the whole It has a curved shape that adheres closely. For this reason, when the valve body 14 is set so that it may contact|abut and close the 1st sealing surface 18(1), the side edge 32si of the valve body 14 is a continuous 1st of the seat ring 12. Abuts against 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 body connecting surface 32 abuts against the seat connecting surface 31 . Thereby, the contact area of the valve body 14 and the seat ring 12 can be made wide, and sealing performance can be improved. Moreover, the side edge 32si of the valve body 14 enters into the continuous 1st sealing surface 18(1)ex with a predetermined sealing amount. For this reason, sealing performance can be improved. When the valve body 14 is set to abut against the second sealing surface 18 (2) and close, and the valve body 14 is set to abut against the locking sealing surface 18 (3) and close Also in one case, 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 similarly. In particular, when the locking sealing surface 18(3) is set to be closed, since the entire side 32si of the valve body 14 abuts against the continuous locking convex portion 20, the contact is more By making the area larger, the sealing performance can be further improved.

Next, based on FIG. 6, the effect of the joint 35 between the inner peripheral sealing structure (sealing portion) 16 and the seat side abutting surface 30 in the seat structure 34 of the present invention is shown. Explain. In Fig. 6(a), the joint portion 35 is indicated by an oblique hatch. In Fig. 6(b), the joint 112 is indicated by an oblique hatch. In Fig.6 (a), the sealing line (valve seat) VS is shown by the dashed-dotted line. In Fig. 6B, the valve seat ridge line VS is indicated by a dashed-dotted line. In the seat structure 34 of the present invention, since both the inner peripheral sealing structure 16 and the seat side abutting surface 30 are concave, in the joint portion 35, the inner peripheral sealing structure 16 and the seat side abutting surface 30 are concave. The shape of the contact surface 30 can be smoothly connected. For this reason, in the joint part 35, unnecessary operation torque is not required. On the other hand, in the prior art, as shown in Fig. 6B, the sealing portion 110 has a convex shape, whereas the seat-side abutting surface 114 has a concave shape. For this reason, the transition part from convex to concave is required for the joint part 112. As shown in FIG. Therefore, in order to be able to connect the shape of the sealing part 110 and the shape of the seat side abutting surface 114 smoothly, the shape 112ov larger than the shape 112or theoretically required was required. Thereby, the required operating torque became large. Moreover, since this switching part is easy to become a design cause of a sealing performance defect, the operation|work, such as confirming sealing performance with an actual machine, was required. For this reason, in the case of the prior art, much development man-hours were required. However, in the present invention, such an operation becomes unnecessary, leading to facilitation of development.

Moreover, in the seat ring 12 which concerns on this invention, the seat part 300 which the outer peripheral surface 30S of the valve body 14 abuts, as shown in FIGS. 8 and 9, is the valve body 14 side. may have a concave curved surface 28CC. In this case, the valve body 14 rotates clockwise around the rotation center C1 of the valve rod, and the outer circumferential surface 30S abuts the concave curved surface 28CC, and the outer peripheral surface 30S is the concave curved surface 28CC. After the entering sealing amount SW gradually increases, it is comprised so that it may stop at the sealing position shown in FIG. The sealing position is a position where the rotating valve body 14 completely stops due to the resistance force from the seat convex portion 28CV. The sealing position is determined by the rotation torque of the valve body 14 , the elastic modulus of the seat ring 12 , and the dimension 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 due to the resistance force from the concave curved surface 28CC, the valve body 14 ), the rotational speed gradually decreases and stops at the sealing position in a sufficiently reduced state. For this reason, the valve body 14 can be stopped reliably in a 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 peripheral 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. Further, a straight line ST0 passing through (passing) the rotation center C1 and the point where the outer circumferential surface is in contact with the concave curved surface in the sealing position is rotated at a constant angular pitch in the counterclockwise (counterclockwise direction) with respect to the straight line ST0. A plurality of pitch straight lines passing through the rotation center C1 are drawn. Next, from the intersections of the rotation locus circle R1 and the pitch circle, the straight line ST0 and the pitch straight line, a predetermined intersection point at which a concave curved surface is likely to be formed is selected. A spline curve passing through the selected intersection is drawn, and this spline curve becomes a 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 r1 be the radius of rotation locus circle R1 centering on rotation center C1 of valve body 14. As shown in FIG. First, a rotation trajectory circle R1 is drawn. Next, with respect to the rotation locus circle R1, a plurality of circles whose radius becomes smaller at a pitch of d mm (eg, 1 mm) are drawn. That is, a pitch circle R2 with a radius of r1-dmm, a pitch circle R3 with a radius of r1-2·d mm, a pitch circle R4 with a radius of r1-3·d mm, a pitch circle R5 with a radius of r1-4·d mm, and a radius A pitch circle R0 of r1-5·dmm is drawn. The order of drawing each circle is not limited.

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

Plot the intersection P5 of ST1 and rotation trajectory circle R1, P4 of ST2 and R2, P3 of ST3 and R3, P2 of ST4 and R4, P1 of ST5 and R5, and P0 of ST0 and R0. (system) do. Next, a spline curve passing through these intersections P5 and the like is drawn. This spline curve becomes the concave curved surface 28CC. P5 is a point at which the outer peripheral surface 30S of the valve body 14 starts 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, in P2, the sealing amount SW2 = 3·dmm dmm, in P1, sealing amount SW1 = 4*dmm, in P0, sealing amount SW0=5*dmm. In the above, one example of the method for forming the concave curved surface 28CC has been described, but the method for forming the concave curved surface 28CC is not limited.

As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, In the range which the same effect|action and effect generate|occur|produce, a change can be added and implemented suitably. For example, the valve of this invention is not limited to a butterfly valve, The kind of valve is not limited. Moreover, the thing of uniaxial eccentricity, biaxial eccentricity, and triaxial eccentricity is contained in the butterfly valve of this invention. Moreover, the structure provided with either one of the 1st sealing surface 18(1) and the 2nd sealing surface 18(2) may be sufficient. In this case, by setting the operating torque so as to close the valve body 14 on either one of the first sealing surface 18(1) and the second sealing surface 18(2), the locking sealing surface 18 It can be closed with a smaller operating torque than the closing in (3)). Moreover, you may form a concave surface with 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 circumferential surface
14: valve body
14s: outer periphery
16: Inner periphery sealing structure
18(1): 1st sealing surface
18(1)ex: continuous first sealing surface
18(2): second sealing surface
18(2)ex: continuous second sealing surface
18(3): Locking sealing surface
18(3)ex: Continuous engagement sealing surface
20: locking convex part
20ex: Consecutive engagement convex part
22: valve rod
24: Seat side valve rod hole
26: Valve body side valve rod hole
28: Valve body side abutting surface
30: Seat side abutting surface
31: Seat joint surface
32: valve body connection surface
32si: side
33: Seat side abutting surface
34: sheet structure
C1: Center of rotation
SW1, SW2, SW3: Sealing amount

Claims (5)

It is provided in the seat ring of the valve, and has an inner circumferential sealing structure in which the outer circumferential surface of the valve body, which swells from the inner circumferential surface of the seat ring and is loaded with fluid pressure, abuts,
a first sealing surface having a concave shape and capable of stopping by contacting the outer circumferential surface of the valve body;
a locking convex portion to which the valve body is caught and rotation of the valve body is regulated;
When the valve body is caught by the locking convex portion, the outer peripheral surface of the valve body abuts against the locking sealing surface capable of stopping.
to provide
The inner circumferential sealing structure is configured such that a sealing amount, which is a depth into which the outer circumferential surface of the valve body enters, becomes larger in the engagement sealing surface than the first sealing surface. The method of claim 1,
an inner peripheral sealing structure arranged in the order of the first sealing surface, the locking sealing surface, and the locking convex part in a direction in which the outer peripheral surface of the valve body moves by rotation of the valve body. 3. The method of claim 1 or 2,
a second sealing surface having a concave shape and capable of being stopped by abutting the outer peripheral surface of the valve body and continuous to the first sealing surface;
The first sealing surface, the second sealing surface, the locking sealing surface, and the locking convex portion are arranged in the order of the first sealing surface, the second sealing surface,
The second sealing surface is configured such that the sealing amount is larger than the first sealing surface,
The inner circumferential sealing structure, wherein the locking sealing surface has a larger sealing amount than the second sealing surface. It is 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 rod hole and abutting against a valve body-side abutting surface around the valve body-side valve rod hole of the valve body;
a continuous first sealing surface continuous to the first sealing surface and extending to the seat-side abutting surface;
a continuous engaging convex portion continuous to the engaging convex portion and extending to the seat-side abutting surface;
and a continuous locking sealing surface continuous to the locking sealing surface and extending to the seat side abutting surface;
The continuous first sealing surface, the continuous engaging convex portion, and the continuous engaging sealing surface are the entire side of the valve body connecting surface connected between the outer peripheral surface of the valve body and the valve body side abutting surface when in contact. A sheet structure having a shape that is in close contact with. A valve comprising the inner circumferential sealing structure according to any one of claims 1 to 3.

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