KR102383952B1 - Butterfly Valve Provided With Slanted Disc - Google Patents

Abstract

The present invention relates to a butterfly valve with an inclined disk, comprising: a body (3) constituting an outer body; Opens and closes the flow of the fluid flowing in the conduit (P), but with a forward radial portion (5-1) that rotates in the same forward direction as the forward flow when the valve is closed, and a reverse radial portion (5-2) that rotates in the opposite direction disk (5) consisting of; and a body seat 7 protruding along the inner circumferential surface of the body 3 so as to contact the ends of the forward radial portion 5-1 and the reverse radial portion 5-2 in the valve closed state. and to prevent rotation of the reverse radial portion 5-2 in the valve closed state, the disk 5 is perpendicular to the axis x of the body 3 and at the same time the rotation axis 51 of the disk 5 When a line perpendicular to ) is referred to as a perpendicular (y), it is characterized in that the disk 5 is inclined to form a disk inclination angle α with respect to the perpendicular y, and thus the forward radius of the disk and the opposite radius Even if the additional axis is formed to be point-symmetrical about the axis of rotation, since the disk is inclined at an acute angle to the waterline, the forward radius portion does not cause significant resistance to the body seat when the valve is opened, while the reverse radius portion is for forward flow in the valve closed state. It is possible to increase the watertight performance.

Description

Butterfly Valve Provided With Slanted Disc

The present invention relates to a butterfly valve with an inclined disk, and more particularly, the contact angle between the disk end surface and the body seat seat surface is formed to be point symmetric with respect to the disk rotation axis, and the disk forward half due to the body seat when the valve is opened. It relates to a butterfly valve with an inclined disk so that the resistance generated on the end face of the neck is reduced and the watertight performance generated between the seat face of the body seat and the end face of the reverse radial end in the closed state of the valve can be greatly increased.

In general, a butterfly valve, particularly a double disk butterfly valve, is a main body 110 and a rotating shaft 120 as disclosed in the double disk butterfly valve (Patent Publication No. 10-2020-0083799) shown in FIG. 1 . , and a bar including the disk 130, when the conduit in the main body 110 is closed by the disk 130, the seat 131 of the disk 130 is fixed to the fixed seat 112 on the inner circumferential surface of the main body 110 is in close contact with each other to achieve watertightness.

By the way, the butterfly valve 101 as above is arranged so as to form point symmetry with respect to the center of the rotation shaft 120 at the angle of the upper and lower parts of the fixed seat 112 or the length from the center of the rotation shaft 120 to the end of the disk 130. In this case, depending on the angle of the seat surface, the opening and closing rotation of the disk 130 is impossible, or even if rotation is possible, the upper end surface of the disk 130 generates a large resistance when the valve is opened, or the lower end surface of the disk 130 is There is a problem in that the watertight performance is greatly reduced in the closed state of the valve.

Publication No. 10-2020-0083799

The present invention is proposed to solve the problems of the conventional butterfly valve as described above, and even though the forward and reverse radial portions of the disk are formed to be point-symmetrical with respect to the axis of rotation, the forward radial portion provides resistance when the valve is opened. At the same time, the purpose of the reverse radius part is to increase the watertight performance in the closed state of the valve.

In order to achieve this object, the present invention is disposed on a fluid conduit, the body constituting the external body; It is mounted in the body to pivotally rotate by a user's manipulation, and opens and closes the flow of fluid flowing on the conduit, but when the valve is closed, a forward radial portion that rotates in the same forward direction as the forward flow, and a reverse radius that rotates in the opposite direction when the valve is closed discs made up of copies; and a body seat protruding along the inner circumferential surface of the body so as to come into contact with the ends of the forward radial portion and the reverse radial portion in the valve closed state, and to prevent rotation of the reverse radial portion in the valve closed state, the disk When a line perpendicular to the axis of the body and at the same time perpendicular to the axis of rotation of the disk is referred to as a perpendicular, the disk is inclined so that the disk forms an inclination angle with respect to the perpendicular with respect to the vertical line.

In addition, the end face and the seat face of the body seat in contact with the end face to be matched with the end face is inclined by a seat inclination angle in a direction in which the seat face creates a wedge action with respect to the end face in the valve closed state, the cross section of the disk Assuming that the angle between the short first diagonal and the disk surface of the disk among the two diagonals of the parallelogram forming When it is determined, it is preferable that the remaining one value satisfies the relational expression of phi + α = β.

In addition, in the closed state of the valve, when the sum of the disc inclination angle and the minor radius angle is equal to or less than the seat inclination angle according to the above relation, the resistance with the body seat according to the valve opening is minimized. desirable.

Preferably, the reverse radius portion is configured to enhance watertight performance against forward flow when the sum of the disc inclination angle and the minor radius angle according to the above relation is greater than the seat inclination angle in the valve closed state.

In addition, the disk, disposed in the middle, the core to determine the disk thickness; and a pair of disk portions integrally formed on the end surfaces of the upstream and downstream sides of the core in the flow direction.

According to the butterfly valve with an inclined disk of the present invention, even if the forward and reverse radial portions of the disk are formed to be point-symmetric about the rotation axis, since the disk is inclined at an acute angle with respect to the water line, the forward radius portion is the body when the valve is opened While not creating significant resistance with the seat, the reverse radius can increase the watertight performance for forward flow with the valve closed.

1 is a longitudinal sectional view showing a conventional butterfly valve.
Figure 2 is a schematic longitudinal cross-sectional view showing a butterfly valve according to an embodiment of the present invention in a valve closed state.
Figure 3 is a schematic longitudinal sectional view showing the butterfly valve of Figure 2 in an open state.
4 is a schematic longitudinal sectional view showing a butterfly valve in a closed state of the butterfly valve according to another embodiment of the present invention.
Figure 3 is an exploded perspective view of Figure 2;
4 is an enlarged cross-sectional view illustrating the upper part of FIG. 2 in detail;

Hereinafter, a butterfly valve having an inclined disk according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The butterfly valve according to the present invention is mainly composed of a body (3), a disk (5), and a body seat (7), as shown by reference numeral 1 in FIGS. 2 and 3 .

Here, the body 3 is a part constituting the outer body of the butterfly valve 1, and is installed between the pipe line P and the pipe line P through which the fluid flows, as shown in FIGS. 2 and 3 . Forming a fluid flow path together with (P), it is formed extending in the axial direction, that is, in the flow direction while going the same inlet/outlet diameter (d) as the inner diameter (D) of the pipe line (P). In addition, as shown in FIGS. 1 and 2, the body 3 is formed with flanges 31 for coupling with the conduit P at both ends of the outer circumferential surface protrude in the radial direction.

The disk 5 is a part that substantially interrupts the flow of the fluid passing through the body 3, and as shown in FIGS. 2 and 3, the fluid distribution hole of the body 3 having an inner diameter d ( 33) is rotatably mounted on the fluid distribution hole 33 by a rotation shaft 51 that crosses the bar, pivoting about the rotation shaft 51 by an external force such as a user's operation to form the fluid flow hole 33 open and close

As such, the disk 5 pivots about the rotation shaft 51, and when the flow indicated by the arrow F in FIGS. 2 and 3 is referred to as a forward flow, this forward flow F and The upper half of the drawing that rotates in the same direction, that is, in the forward direction, is called the forward radial portion 5-1, and the lower half of the drawing rotates in the opposite direction to the upper forward flow F, that is, in the reverse direction, the reverse radial portion 5-2 In the valve closed state, the disk 5 is perpendicular to the axis x of the body 3 and at the same time a line perpendicular to the rotation axis 51 of the disk 5 is called a perpendicular (y), the disk 5 ) is inclined in the clockwise direction in the drawing to form a disc inclination angle α with respect to the perpendicular y. This allows the body sheet 7 to rotate the forward radial portion 5-1, but prevent the reverse radial portion 5-2 from rotating, as will be described later.

In addition, it is preferable that the forward radial portion 5-1 and the reverse radial portion 5-2 are point-symmetrical about the rotational axis 51 as shown, and accordingly, the forward radial portion 5-1 ) and the upper and lower radial end surfaces 55 and 56 of each of the reverse radial portions 5-2 are also point-symmetrical about the rotation axis 51, and come into contact with the respective end surfaces 55 and 56 in the closed valve state. The seat surface 71 to do the same is symmetrical about the axis of rotation 51 as a center.

The body seat 7 is a means for tightly maintaining a fluid seal between the disk 5 and the body 3 in the valve closed state, and as shown in FIGS. 2 and 3, the forward half of the disk 5 It is formed to protrude radially along the inner circumferential surface of the body 3 so as to be in contact with the ends of the neck portion 5-1 and the reverse radial portion 5-2, that is, the end surfaces 55 and 56, and is made of various materials. However, it is preferable to be made of a metal material.

In addition, as shown in Figs. 2 and 3, the seat surface 71 in contact with the distal surfaces 55 and 56 of the disk 5 is inclined at the seat inclination angle β, as described above. Bar, the bore (d) through which the fluid passes through the body sheet (7), that is, the fluid passage diameter is smaller than the inner diameter (D) of the conduit (P), and is expressed by Equation 1 as follows.

Here, d is the fluid passage diameter, D is the body inner diameter, α is the disc inclination angle, and β is the seat inclination angle, respectively.

In this way, the distal surfaces 55 and 56 of the disk 5 and the seat surface 71 of the body seat 7 that are mated in contact with the distal surfaces 55 and 56 are the seat surfaces 71 when the valve is closed. It is inclined by the seat inclination angle β in the direction which produces a wedging action with respect to the cross-sections 55 and 56. That is, the seat inclination angle β at which the end surfaces 55 and 56 and the seat surface 71 are inclined with respect to the axis x of the body 3 is formed so as to form point symmetry about the rotation axis 51 .

At this time, the disk 5 has a cross-sectional shape of a parallelogram as shown in FIG. 2 , the first diagonal 11 having a shorter length among the two diagonals 11 and 13 and the disk surface of the disk 5 are If the angle formed is the minor radius angle (ϕ), the disc inclination angle (α), the seat inclination angle (β), and the minor radius angle (ϕ) are obtained according to Equation 2 below when two values are determined. lose

Meanwhile, another embodiment of the present invention is shown in FIG. 4 . As shown in FIG. 4, the butterfly valve 1 according to this embodiment employs a double disk in which the disk 5 is composed of a core 53 and a pair of disk portions 57 and 58.

Here, the core 53 is a part that determines the thickness of the disk 5 and is disposed in the middle, and the disk parts 57 and 58 are in close contact with the body seat 7 when the valve is closed to form a watertight portion, The disk portion 57 is attached to the upstream end surface of the upper core 53 in the flow direction and the disk portion 58 is attached to the downstream end surface to form a pair, and is integrally formed.

At this time, the body seat 7 may make a deviation in the longitudinal direction of the disk 5 in the height of the seat surfaces 71 and 72, as shown in FIG. 4, and this deviation is the seat surface 71, 72 A seat tuck 75 is generated at the boundary of

Now, the operation of the butterfly valve 1 with a disk inclined according to a preferred embodiment of the present invention will be described as follows.

According to the butterfly valve 1 of the present invention, as shown in FIGS. 2 and 3, when the forward flow F occurs in the closed state of the disk 5, the forward radial portion 5 of the disk 5 -1) is the seat inclination angle (β) is determined when the sum of the disc inclination angle (α) and the minor radius angle (φ) is determined according to Equation 2 above, and the sum of the disk inclination angle (α) and the minor radius angle (φ) is When it is less than or equal to the seat inclination angle β, the resistance with the body seat 7 according to the valve opening is minimized.

For example, as shown in FIG. 5 , when the disk 5 having a cross section in the form of a parallelogram is opened in a closed state, the intersection point of the upper side of the disk 5 and the first diagonal line 11 is the first edge E1 ) and the intersection of the second diagonal lines 13 is the second edge E2, when the sum of the disc inclination angle α and the minor radius angle φ is equal to the seat inclination angle β, the first edge Since part (E1) rotates while drawing a circle with the radius from the center (O) of the disk (5) to the first edge (E1), the direction (arrow A) to start rotation is the seat surface 71 ), and therefore rotates smoothly without receiving frictional resistance against the body sheet (7). At this time, the distance from the center (O) to the middle (M1) of the disk 5 is the radius of the second edge (E2) part, as well as the first and second edges (E1, E2) middle (M1) part Since it rotates while drawing a circle, it rotates smoothly without receiving frictional resistance with respect to the body sheet 7 .

Therefore, in Equation 2 above, for example, the disc inclination angle α and the minor radius angle φ are determined, and when the sum of these becomes smaller than the seat inclination angle β, the disc 5, that is, the forward radius portion 5 - 1) does not cause friction with the body seat 7 when it is opened from a closed state, and is easily opened. Conversely, if the disc inclination angle α increases so that the sum of the disc inclination angle α and the minor radius angle φ becomes larger than the seat inclination angle β, for example, the first corner E1 portion is indicated by a dotted arrow C in FIG. 5 . Since it rotates in the direction, it causes friction with the body sheet 7, and thus the disc 5 is not smoothly opened.

On the other hand, in the closed state of the disk 5, when forward flow occurs, the reverse radius portion 5-2 is the seat inclination angle β by the sum of the disk inclination angle α and the minor radius angle φ according to Equation 2 above. Watertight performance for forward flow (F) is exhibited only when equal to will strengthen

For example, as shown in FIG. 6 , when the reverse radial portion 5-2 is pressed against the body sheet 7 by the forward flow F in the closed state of the disk 5, the disk 5 If the intersection of the lower side and the first diagonal line 11 is the third edge E3, and the intersection of the second diagonal line 13 is the fourth edge E4, the disc inclination angle α and the minor radius angle φ When the sum of ) is equal to the seat inclination angle β, the third edge E3 part rotates in a circle with the radius from the center O of the disk 5 to the third edge E3 as the radius. Since the force is applied in the direction of At this time, the third and fourth corners (E3, E4) middle (M2) part also rotates while drawing a circle with the distance from the center (O) to the middle (M2) of the disk 5 as a radius, so the body sheet (7) does not cause frictional resistance, and thus the water holding capacity is also minimized.

Accordingly, in Equation 2 above, for example, the disc inclination angle α and the minor radius angle φ are determined, and when the sum of these becomes larger than the seat inclination angle β, the disc 5, that is, the reverse radius portion 5-2 ) even when pressed by the forward flow F in the closed state, it causes friction with the body sheet 7 to exhibit watertight performance. However, conversely, if the disc inclination angle α is reduced so that the sum of the disc inclination angle α and the minor radius angle φ becomes smaller than the seat inclination angle β, for example, the third corner E3 is the dotted line in FIG. Since it rotates in the direction of the arrow (E), it does not cause friction with the body sheet (7), and thus the disk (5) has minimal watertight performance.

On the other hand, the disk 5 according to another embodiment shown in FIG. 3 is a double disk, and is double watertight through a pair of disk portions 57 and 58, and in particular, a reverse radial portion ( 5-2) It will double block the leakage occurring at the end. Moreover, when the longitudinal deviation occurs to the extent that the seat tuck 75 is generated on the seat surfaces 71 and 72, it is possible to increase the watertight performance at the end of the reverse radial portion 5-2.

1: Butterfly valve 3: Body
5: Disc 5-1: Forward radial part
5-2: Reverse radial part 7: Body sheet
31: flange 33: distributor
51: rotation shaft 53: deep part
55, 56: end face 57, 58: disk part
71,72: seat surface 75: seat tuck
α: disc inclination angle β: seat inclination angle
φ : Short radius P : Pipe
x: axis y: perpendicular

Claims (5)

delete A body (3) disposed on the fluid conduit (P), forming an external body (3);
It is mounted in the body 3 so as to pivot by a user's operation, and opens and closes the flow of the fluid flowing on the conduit P, but when the valve is closed, the forward radial portion 5-1 rotates in the same direction as the forward flow. ) and a disk (5) consisting of a reverse radial portion (5-2) rotating in the opposite direction; and
The body seat 7 protruding along the inner circumferential surface of the body 3 so as to come into contact with the distal surfaces 55 and 56 of each of the forward radial portion 5-1 and the reverse radial portion 5-2 in the valve closed state. ); is made including;
The disk 5 is perpendicular to the axis x of the body 3 and at the same time to the axis of rotation 51 of the disk 5 so as to prevent the rotation of the reverse radial portion 5-2 in the valve closed state. When the orthogonal line is called a perpendicular (y), the disk 5 is inclined to form a disk inclination angle (α) with respect to the perpendicular (y),
The distal face (55,56) and the seat face (71) of the body seat (7) in mating contact with the distal face (55, 56), in the valve closed state, the seat face (71) is the distal face ( 55,56) in the direction that causes a wedge action,
When the angle between the short first diagonal 11 and the disk surface of the disk 5 among the two diagonals of the parallelogram forming the cross section of the disk 5 is the minor radius angle (φ), the disk inclination angle (α), the seat inclination angle (β), and the minor radius angle (φ), when two of these values are determined, the other value is
φ+α=β
A butterfly valve with an inclined disk, characterized in that it satisfies the relational expression of 3. The method according to claim 2,
The forward radius portion 5-1 is in the valve closed state, when the sum of the disc inclination angle α and the minor radius angle φ is equal to or less than the seat inclination angle β according to the above relation, the valve opens. A butterfly valve with an inclined disk, characterized in that it is designed to minimize resistance with the body seat (7). 3. The method according to claim 2,
In the valve closed state, when the sum of the disc inclination angle α and the minor radius angle φ according to the above relation is greater than the seat inclination angle β, the forward flow (F) A butterfly valve with an inclined disc, characterized in that it is designed to enhance the watertight performance for the . 3. The method according to claim 2,
The disk 5 is
a core 53 disposed in the middle to determine the disk thickness; and
A butterfly valve with an inclined disk, characterized in that it is a double disk comprising; .

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