KR102104743B1 - Swing check valve having function for preventing chattering - Google Patents

Abstract

The present invention relates to a swing check valve having a chattering prevention function, capable of preventing a chattering phenomenon in which a disk is repeatedly opened and closed when an increase speed of a flow rate is low or a low flow rate continuously flows, and remarkably reducing the impact applied to a valve body and the disk while obtaining a sufficient opening area when the disk is completely opened. The swing check valve having the chattering prevention function comprises: the valve body including an inlet and an outlet; a rotation arm in which one end rotates around a hinge shaft installed by penetrating the inside of the valve body; a disk-shaped disk in which a rear side rotates by being connected to the other end of the rotation arm so that a front side opens and closes the inlet of the valve body; a hinge spring connected to the hinge shaft of the rotation arm and providing a spring force to the rear side of the disk so that the front side of the disk closes the inlet of the valve body; and a ball check valve unit installed in the lower part of the disk to pass through the front and rear sides of the disk and enabling a fluid flowing from the inlet of the valve body to pass through the ball check valve unit, wherein the ball check valve unit prevents a backflow of fluid from the outlet of the valve body.

Description

Swing check valve with chattering prevention function {SWING CHECK VALVE HAVING FUNCTION FOR PREVENTING CHATTERING}

The present invention relates to a swing check valve, and more specifically, has a chattering prevention function that can prevent the chattering phenomenon that the disk is repeatedly opened and closed when the rate of increase of the flow rate is small or a small flow rate is continuously flowing. It relates to a swing check valve.

In general, the swing check valve is installed on a pipe through which the fluid passes, and is a valve for preventing backflow of the fluid so that the fluid flowing inside the pipeline flows only in one direction. That is, when the fluid is normally flowing inside the pipeline, it is opened by the pressure of the fluid, and when the fluid flows back due to a malfunction of the pump or other reasons, it is automatically closed and the back flow of the fluid is blocked.

1 and 2, the swing check valve includes a valve body 10 provided with an inlet 11 and an outlet 12, and a hinge shaft having one end installed through the inside of the valve body 10 ( 21) A disk having a disk shape that rotates around the center and a rear end coupled to the other end of the pivot arm 20 so that the front side opens and closes the inlet 11 of the valve body 10 (30), coupled to the hinge shaft (21) of the pivot arm (20), the front surface of the disk (30) is closed at the rear surface of the disk (30) to close the inlet (11) of the valve body (10). It comprises a hinge spring 40 that provides a spring force.

In the swing check valve according to the prior art configured as described above, the disk 30 is automatically opened by the pressure of the fluid when the fluid normally flows inside the pipeline as shown in FIG. 3, and on the contrary, shown in FIG. 4 As the fluid flows back, the disk 30 swings in the reverse direction to quickly close the inlet 11 of the valve body 10 to prevent back flow of the fluid.

The operation process of FIGS. 3 and 4 of the swing check valve is a case in which the disc is opened at a time when the rate of increase of the flow rate is large as shown in FIG. 5, and the rate of increase of the flow rate as shown in FIGS. 6 and 7 When a small or small flow rate persists, a chattering phenomenon in which the disk 30 is repeatedly opened and closed as shown in FIG. 8 occurs.

Due to this chattering phenomenon, the disk 30 repeatedly strikes the inlet 11 of the valve body 10, and not only the contact surface of the disk 30 but also the contact surface (sheet surface) of the inlet 11 is impacted. Damage caused by noise, of course, occurs.

In addition, as shown in FIG. 9, when the disc 30 is completely opened, an impact occurs when the lower rear end of the disc 30 contacts the upper end of the outlet 12 of the valve body 10 to prevent such impact. The buffer member 50 is also installed at the bottom of the rear of the disk 30.

However, the shock absorbing member 50 is coupled to the lower rear surface of the disk 30. First, the damage is caused in the open area of the disk 30 by the gap buffered by the shock absorbing member 50, and the hinge shaft 21 ) Because the centrifugal force increases as the distance from the center of rotation increases, and the amount of impact increases, the shock absorbing member 50 is easily damaged or detached, and the disk 30 as well as the outlet 12 of the valve body 10 are damaged. there is a problem.

The object of the present invention devised to solve the above problems is to prevent the chattering phenomenon that the disk is repeatedly opened and closed when the rate of increase of the flow rate is small or a small flow rate is continuously flowing, and the disk is completely An object of the present invention is to provide a swing check valve having a chattering prevention function capable of significantly reducing the amount of impact applied to the valve body and the disc while securing a sufficient opening area during opening.

In order to achieve the above object, the swing check valve having a chattering prevention function according to the present invention is rotated around a valve body provided with an inlet and an outlet, and a hinge shaft, one end of which is installed through the inside of the valve body. An arm, a disk having a disk shape having a rear face coupled to the other end of the pivot arm and rotating together so that the front face opens and closes the inlet port of the valve body, and the front face of the disk is coupled to the hinge shaft of the pivot arm. A hinge spring providing a spring force to the rear surface of the disk to close the inlet port, and a fluid installed from the inlet port of the valve body to pass through the front and rear surfaces of the disk and passing through the fluid, pass through the valve body. The fluid flowing back from the outlet includes a ball check valve part that blocks.

In addition, the ball check valve unit, it characterized in that it comprises a single first ball check valve installed at the lower center of the disk.

In addition, the ball check valve unit, characterized in that it further comprises a pair of second ball check valves installed symmetrically around the first ball check valve at a higher position than the first ball check valve.

In addition, the ball check valve unit, characterized in that it further comprises a pair of third ball check valves installed symmetrically around the first ball check valve at a higher position than the second ball check valve.

In addition, the buffer support bracket installed inside the valve body so as to be positioned within the rotation angle range of the pivot arm, the upper portion is coupled to the buffer support bracket, the lower contact with the pivot arm according to the rotation of the pivot arm It is characterized in that it further comprises an elastically deforming buffer.

In addition, the pivot arm, further comprising a buffer protrusion formed to protrude on the surface in contact with the buffer portion, the buffer portion has a hollow interior, the upper fixing portion is fixedly coupled to the buffer support bracket, the lower contact portion The elastic deformation body is elastically deformed while being in contact with the buffer protrusion of the rotating arm, a spring sheet is inserted into the fixed portion of the elastic deformation body, and a spring guide is inserted into the contact portion of the elastic deformation body, It characterized in that it comprises a coil spring that provides a spring force between the spring seat and the spring guide.

In addition, the elastically deformed body is characterized in that the inclined groove that induces the contact portion to elastically deform in the vertical direction upon contact with the buffer protrusion of the rotating arm is inclined inward along the inner circumference of the contact portion.

Swing check valve having a chattering prevention function according to the present invention, it is possible to prevent the chattering phenomenon that the disk is repeatedly opened and closed when the rate of increase of the flow rate is small or a small flow rate continuously flows through the ball check valve part, , It has the effect of significantly reducing the amount of impact applied to the valve body and the disc while securing a sufficient opening area when the disc is fully opened through the buffer supporting bracket and the buffer portion.

1 is a side sectional view showing a swing check valve according to the prior art,
FIG. 2 is a cross-sectional view taken along line A-A 'of the embodiment of FIG. 1,
3 is a side cross-sectional view showing a state in which the disk is opened by the flow of fluid from the inlet in the embodiment of FIG. 1,
FIG. 4 is a side cross-sectional view showing a state in which the disk is closed due to backflow of fluid from the outlet in the embodiment of FIG. 1,
5 is a graph showing the opening angle of the disk according to the increase in the flow rate when the increase rate of the flow rate is large with reference to the embodiment of FIG. 3,
6 is a graph showing the opening angle of the disk according to the increase in the flow rate when the rate of increase of the flow rate is small with reference to the embodiment of FIG. 3,
7 is a graph showing the opening angle of the disk according to the increase in the flow rate when the small flow rate continues with reference to the embodiment of FIG. 1,
8 is a cross-sectional side view showing a repetitive opening and closing process of the disc in the chattering state shown in FIGS. 6 and 7 from the embodiment of FIG. 1;
9 is a side cross-sectional view showing a state at the time of the maximum opening of the disk with respect to the maximum flow rate from the embodiment of FIG. 1,
10 is a side cross-sectional view showing an embodiment of a swing check valve according to the present invention,
11 is a cross-sectional view of the first embodiment seen from the line B-B 'of the embodiment of FIG. 10,
12 is a side cross-sectional view showing a state in which the disc does not open when the rate of increase in flow rate is small and the flow rate continues from the embodiment of FIG. 10, and the flow rate flows through the ball check valve unit.
13 is a graph showing the opening angle of the disk according to the increase in the flow rate when a single first ball check valve is installed with reference to the embodiment of FIG. 11,
14 is a cross-sectional view of the second embodiment viewed from the line B-B 'of the embodiment of FIG. 10,
15 is a graph showing the opening angle of the disk according to the increase in the flow rate when the first and second ball check valves are installed with reference to the embodiment of FIG. 14,
16 is a cross-sectional view of the third embodiment viewed from the line B-B 'of the embodiment of FIG. 10,
17 is a graph showing the opening angle of the disk according to the increase in flow when the first to third ball check valves are installed with reference to the embodiment of FIG. 16,
18 to 20 are side cross-sectional views showing a process from the closed angle to the maximum open state of the disc according to the increase in the flow rate from the embodiment of FIG. 10,
21 is a side sectional view of the main portion showing an enlarged buffer part in the embodiment of FIG. 18;
22 is a sectional side view of the main portion showing an elastically deformed state by contacting the buffer protrusion of the pivot arm from the embodiment of FIG. 21;

Hereinafter, a preferred embodiment of a swing check valve having a chattering prevention function according to the present invention will be described in detail with reference to the accompanying drawings.

Swing check valve having a chattering prevention function according to the present invention, as shown in Figures 10 to 22, the valve body 100, the rotating arm 200, the disc 300, the hinge spring 400 and the ball check valve It comprises a portion 500, may further include a buffer support bracket 600 and the buffer portion 700. The ball check valve unit 500 may include a first ball check valve 510, a second ball check valve 520 and a third ball check valve 530, and the buffer part 700 is elastically deformed It may include a body 710, a spring seat 720, a spring guide 730 and a coil spring 740.

The valve body 100 is provided with an inlet 110 and an outlet 120 as shown in FIG. 10. The valve body 100 is coupled to communicate through a flange (not shown) formed in the inlet port 110 and the outlet port 120 on the pipe through which the fluid flows.

The rotating arm 200 rotates around the hinge shaft 210, one end of which is installed through the inside of the valve body 100, as shown in FIGS. 10, 11 and 18 to 20. That is, one end of the pivot arm 200 is coupled to the hinge shaft 210 to rotate together, and the other end is coupled to the disc 300 to be described later to open and close the disc 300 according to the rotation of the pivot arm 200.

The disk 300 has a disc shape as shown in FIGS. 10, 11 and 18 to 20, and the rear side is coupled to the other end of the pivot arm 200 so that the front side opens and closes the inlet 110 of the valve body 100. We are meeting together.

The hinge spring 400 is coupled to the hinge shaft 210 of the pivot arm 200 so that the front surface of the disk 300 closes the inlet port 110 of the valve body 100 so that the front surface of the disk 300 is closed. To the spring force. The hinge spring 400 is a torsion spring, as shown in the drawing, a state in which the disk 300 is pressed with a spring force to close the inlet 110.

That is, when there is no flow of fluid from the inlet 110 of the valve body 100, the front surface of the disc 300 is caused by the spring force of the hinge spring 400 and the weight of the disc 300. When the inlet port 110 is closed and fluid flows from the inlet port 110 of the valve body 100, the spring force of the hinge spring 400 and the force of the weight of the disk 300 are caused by the pressure of the fluid. And the rotating arm 200 rotates around the hinge shaft 210 and the disk 300 also rotates, so that the front surface of the disk 300 opens the inlet 110 of the valve body 100.

At this time, if the fluid flowing from the inlet 110 has a large increase rate of the flow rate, the disc 300 will be opened at once, but the fluid flowing from the inlet 110 has a small increase rate of flow rate or a constant flow of fluid at a low flow rate. In the case, the spring force of the hinge spring 400 and the self-weight of the disk 300 become chattering phenomenon that repeatedly opens and closes the disk 300 while the pressure of the fluid becomes equal or less. Due to the chattering phenomenon, noise is generated, and the front surface of the disk 300 repeatedly contacts the inlet 110 to generate an impact. In order to prevent such a chattering phenomenon, a swing check valve having a chattering prevention function according to the present invention includes a ball check valve unit 500.

That is, the ball check valve unit 500 is installed in the lower portion of the disc 300 to penetrate the front and rear surfaces of the disc 300, as shown in Figures 10 to 12, the inlet of the valve body 100 ( The fluid flowing from 110) passes, but the fluid flowing backward from the outlet 120 of the valve body 100 is blocked. The ball check valve unit 500 itself is a check valve that consists of a ball and a spring, as is well known, and opens only the flow path in one direction. Accordingly, when the fluid continuously flows at a small flow rate through the ball check valve unit 500, the disc 300 is not opened, and the fluid flowing from the inlet 110 through the ball check valve unit 500 is discharged through the ball outlet valve 500. It is to induce flow to. Through this, it is possible to prevent chattering due to repeated opening and closing of the inlet 110 of the disk 300 when the flow rate of the fluid is small.

The ball check valve unit 500 may include a single first ball check valve 510 installed at the lower center of the disk 300 as shown in FIGS. 11 and 13, and illustrated in FIGS. 14 and 15 As described above, the first ball check valve 510 may further include a pair of second ball check valves 520 installed symmetrically around the first ball check valve 510 at a position higher than the first ball check valve 510, , A pair of third ball check valves 530 installed symmetrically left and right around the first ball check valve 510 at a position higher than the second ball check valve 520 as shown in FIGS. 16 and 17. ) May be further included.

Through this, as shown in FIGS. 13, 15, and 17, the opening angle of the disc 300 according to the increase in the flow rate according to the installation state of the first to third ball check valves 510 to 530 may be performed without a chattering phenomenon. 300) can control the holding time in the closed state, and determine whether to install the first to third ball check valves 510 to 530 according to the size or condition of the swing check valve and the industrial field according to the present invention. will be.

On the other hand, looking at the opening angle of the disk 300 according to the increase in the flow rate as shown in FIGS. 18 to 20, the disk 300 at a low flow rate as shown in FIG. The fluid flows through 500), and the disk 300 is opened when the increase rate of the flow rate increases as shown in FIG. 19, and when the maximum flow rate flows as shown in FIG. 20, the disk 300 is also in the maximum open state. Becomes

At this time, by installing the shock absorber 700 by reducing the rotation radius from the hinge shaft 210 so that the lower end of the disc 300 does not contact the outlet 120 of the valve body 100 in the maximum open state of the disc 300. It is possible to significantly reduce the amount of impact applied to the valve body 100 and the disc 300 while ensuring a sufficient opening area when the disc 300 is completely opened.

That is, as shown in FIGS. 10, 11 and 18 to 20, the buffer support bracket 600 is installed inside the valve body 100 so as to be positioned within the rotation angle range of the pivot arm 2000, and the buffer portion 700 ) The upper portion is coupled to the buffer support bracket 600, the lower portion is elastically deformed upon contact with the rotating arm 200 according to the rotation of the rotating arm 200.

More specifically, the pivot arm 200 includes a buffer protrusion 220 protruding from a surface in contact with the buffer portion 700, and the buffer portion 700 is a buffer protrusion 220 of the pivot arm 200 ) To exert a buffering effect by elastic deformation. In order to maximize the buffering effect of the cushioning part 700, the cushioning part 700 includes an elastically deformed body 710, a spring seat 720, a spring guide 730, and a coil spring as shown in FIGS. 740).

The elastic deformation body 710 has a hollow interior, the upper fixing portion 711 is fixedly coupled to the buffer support bracket 600, and the lower contact portion 712 is extended to buffer the pivoting arm 200 Elastically deforms while in contact with the protrusion 220. The elastic deformation body 710 is rubber, silicone so that the upper fixed portion 711 and the lower contact portion 712 are elastically deformed while the contact portion 712 extended in a cross-sectional '⊥' shape contacts the buffer protrusion 220. Or it may have a synthetic resin material.

The spring seat 720 is inserted and coupled inside the fixing portion 711 of the elastically deformed body 710, and the spring guide 730 is inserted and coupled inside the contact portion 712 of the elastically deformed body 710. The spring sheet 720 and the spring guide 730 are rigid bodies that do not elastically deform, and serve to support and guide the coil spring 740, which will be described later. The coil spring 740 provides a spring force between the spring seat 720 and the spring guide 730, and provides a spring force when the elastically deformed body 710 elastically deforms while in contact with the buffer protrusion 220. Doubles the buffering effect.

At this time, the rotating arm 200 does not move up and down, but rotates while drawing a radius, so that the buffer protrusion 220 of the rotating arm 200 also rotates together, and contacts the elastic deformation body 710 ( 712). Therefore, in order to induce the elastic deformation of the contact portion 712 in the vertical direction, the contact portion 712 is formed with an inclined groove 712a along the inner circumference as shown in FIGS. 21 and 22. That is, the elastically deformed body 710 has an inclined groove 712a which induces the contact portion 712 to elastically deform in the vertical direction when the contact portion 712 contacts the buffer protrusion 220 of the pivot arm 200 of the contact portion 712 It is formed to be inclined inward along the inner circumference.

As described above, in the swing check valve having the chattering prevention function according to the present invention, the disk 300 is repeatedly opened when the rate of increase of the flow rate is small or a small flow rate continuously flows through the ball check valve unit 500. And it is possible to prevent the chattering phenomenon that is closed, while securing a sufficient opening area when the disk 300 is completely opened through the buffer support bracket 600 and the buffer part 700, the valve body 100 and the disk 300 There is an effect that can significantly reduce the amount of impact applied to the.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the items described in the claims, and a person having ordinary knowledge in the technical field of the present invention can improve and modify the technical spirit of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it is apparent to those skilled in the art.

100: valve body
110: inlet 120: outlet
200: Hoedong arm
210: hinge shaft 220: buffer projection
300: disc
400: hinge spring
500: ball check valve unit 510: first ball check valve
520: second ball check valve 530: third ball check valve
600: buffer support bracket
700: buffer part
710: elastic deformation body 711: fixing part
712: contact 712a: inclined groove
720: spring seat 730: spring guide
740: coil spring

Claims (7)

A valve body provided with an inlet and an outlet, and a pivoting arm pivoting around a hinge axis, one end of which is installed through the inside of the valve body, and a rear face coupled to the other end of the pivoting arm so that the front side opens and closes the inlet of the valve body. A disk having a disk shape to rotate together, and a hinge spring that is coupled to a hinge axis of the pivot arm to provide a spring force to the rear surface of the disk such that the front surface of the disk closes the inlet of the valve body, and before and after the disk It is installed on the lower portion of the disk to penetrate the surface, the fluid flowing from the inlet of the valve body to pass through, and includes a ball check valve portion to block the fluid flowing back from the outlet of the valve body,
A buffer support bracket installed inside the valve body so as to be positioned within a rotation angle range of the pivot arm;
The upper portion is coupled to the buffer support bracket, the lower portion further comprises a buffer portion elastically deformed upon contact with the rotating arm according to the rotation of the rotating arm,
The pivot arm,
Further comprising a buffer protrusion formed protruding on the surface in contact with the buffer portion,
The buffer unit,
An elastically deformed body having a hollow interior, an upper fixed portion is fixedly coupled to the buffer support bracket, and an elastic contact body is elastically deformed while the lower contact portion is expanded to contact the buffer protrusion of the pivot arm,
A spring sheet inserted and coupled inside the fixed portion of the elastically deformed body,
A spring guide inserted and coupled into the contact portion of the elastically deformed body,
It includes a coil spring providing a spring force between the spring seat and the spring guide,
The elastic deformation body,
Swing check valve having a chattering preventing function, characterized in that the inclined groove that induces the contact portion to elastically deform in the vertical direction upon contact with the buffer protrusion of the rotating arm is inclined inward along the inner circumference of the contact portion.
According to claim 1,
The ball check valve unit,
Swing check valve having a chattering prevention function, characterized in that it comprises a single first ball check valve installed at the bottom center of the disk.
According to claim 2,
The ball check valve unit,
Swing check valve having a chattering prevention function, characterized in that it further comprises a pair of second ball check valves installed symmetrically around the first ball check valve at a higher position than the first ball check valve.
According to claim 3,
The ball check valve unit,
Swing check valve having a chattering prevention function, characterized in that it further comprises a pair of third ball check valves installed symmetrically around the first ball check valve at a higher position than the second ball check valve.
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