KR20230169798A - Swing check valve - Google Patents

Abstract

The present invention can smoothly perform the original check function and completely close the fluid flow in both directions when necessary with a simple configuration without deforming or damaging the valve body, and the pressure difference between the inlet and outlet continuously changes. Accordingly, it relates to a swing check valve that can completely close the disc when necessary even when the disc does not completely close the inlet or when the disc is open, wherein the front inlet and the rear outlet communicate through a central internal flow passage, A valve body with an annular valve seat fixedly installed in the internal flow path in the inlet direction, a hinge shaft installed inside the valve body above the valve seat, and one end of the arm shaft are inserted into the hinge shaft and centered on the hinge shaft. A rotating arm that rotates, and the front side is coupled to the other end of the rotating arm so that the front side opens and closes the valve seat of the valve body and rotates together, and the valve seat is opened so that fluid flows from the inlet to the outlet, but vice versa. A disc-shaped disk that closes the valve seat to prevent fluid from flowing in that direction, and a locking disk that selectively interferes with the arm axis of the rotation arm and locks the rotation of the arm axis so that the disk forcibly closes the valve seat. It is accomplished including means.

Description

Swing check valve {SWING CHECK VALVE}

The present invention relates to a swing check valve installed on a pipe through which a fluid passes, and for preventing backflow of the fluid so that the fluid flowing inside the pipe flows in only one direction.

Generally, a swing check valve is installed on a pipe through which fluid passes, and is a valve to prevent backflow of fluid so that the fluid flowing inside the pipe flows in only one direction. That is, when the fluid is flowing normally inside the pipe, it is opened by the pressure of the fluid, but when the fluid flows back due to a pump malfunction or other reasons, it automatically closes to block the backflow of the fluid.

This swing check valve includes a valve body provided with a front inlet and a rear outlet, a rotating arm whose one end rotates around a hinge axis installed through the inside of the valve body, and whose front side opens and closes the inlet of the valve body. A disc-shaped disk whose rear side is coupled to the other end of the rotating arm and rotates together, and which opens the valve seat to allow fluid to flow from the inlet to the outlet, but closes the valve seat to prevent fluid from flowing in the opposite direction. It is made including.

In other words, in the swing check valve, the disk is pushed up only when the pressure at the inlet is higher than the pressure at the outlet, allowing fluid to flow from the inlet to the outlet. Conversely, when the pressure at the outlet becomes higher than the pressure at the inlet, the disk itself due to the pressure difference. It is a structure that closes automatically due to the weight of the unit or the elastic force of a separate spring.

However, in the general swing check valve described above, even though the pressure at the outlet is higher than the pressure at the inlet and the disc closes the inlet, the disc cannot completely close the inlet as the pressure difference between the inlet and outlet continuously changes, or the disc cannot completely close the inlet or the steam pipe of the boiler. There are cases where it is necessary to completely close the steam pipe in both directions, such as the SDNR valve (Screw Down Non-Return Valve) used in .

Accordingly, the 'swing check valve' of Registered Utility Model No. 20-0422885 is equipped with a disc pressurizing unit to block the gap between the disc and the inlet, and the 'Swing Check Valve' of Registered Patent No. 10-1652063 has a It is equipped with a locking unit that locks the bottom of the disk so that it can be completely closed in both directions to prevent fluid from flowing in either the inlet or outlet direction.

However, the disk pressing unit or locking unit of the swing check valve according to the prior art described above provides a separate space at the lower or lower part of the valve body to pressurize or lock the lower or lower part of the disk, and pressurizes the disk. There is a problem in that manufacturing and assembly become complicated because a device must be installed for this purpose.

In addition, the disc pressurizing unit or locking unit can pressurize and secure the disc only when the disc closes the inlet, so as the pressure difference between the inlet and outlet continuously changes, the disc cannot completely close the inlet or the disc is open. There is a problem that there is no way to close the disc when the disc needs to be completely closed due to pump malfunction or other critical reasons.

The purpose of the present invention, which was devised to solve the above problems, is to be able to smoothly perform the original check function and completely close the fluid flow in both directions when necessary with a simple configuration without deforming or damaging the valve body. The aim is to provide a swing check valve with improved convenience in manufacturing and assembly.

In addition, as the pressure difference between the inlet and the outlet continuously changes, the disc cannot completely close the inlet, or even when the disc is open, it provides a swing check valve that can completely close the disc when necessary.

In order to achieve the above object, the swing check valve of the present invention is a valve body in which the front inlet and the rear outlet communicate through a central internal passage, and an annular valve seat is fixedly installed in the internal passage in the direction of the inlet. and a hinge shaft installed inside the valve body above the valve seat, a rotating arm with one end of the arm shaft inserted into the hinge shaft and rotating around the hinge shaft, and a front surface of the valve seat of the valve body. The rear side is coupled to the other end of the rotating arm to open and close and rotate together, and the valve seat is opened to allow fluid to flow from the inlet to the outlet, but the valve seat is closed to prevent fluid from flowing in the opposite direction. It includes a disk, and a locking means that selectively interferes with the arm axis of the pivot arm and locks the rotation of the arm axis so that the disk forcibly closes the valve seat.

In addition, the rotating arm further includes a locking arm protrusion protruding in a half-ring shape along a coaxial direction on one side of the arm axis, and the locking means is cylindrical and rotates on the same axis as the hinge axis. A rotatable locking member that can be installed and has a quarter-ring-shaped locking interference protrusion protruding along the coaxial direction on one side so as to be located in an empty half excluding the locking arm protrusion of the arm axis; A rotational locking shaft, one side of which is coaxially coupled to the other side of the rotational locking member and rotates together, a rotational locking lever that is coupled to the other side of the rotational locking shaft to rotate the rotational locking shaft, and a rotational mechanism that rotates the rotational locking lever forward and backward. It is characterized by including a locking actuator.

In addition, the rotational locking shaft is characterized in that one side is coupled with a key to the other side of the rotational locking member.

In addition, the rotational locking actuator rotates the rotational locking shaft and the rotational locking member in reverse when the rotational locking lever is reversely rotated, and the locking interference allows the disk to perform a check function of opening and closing the valve seat. When the projection does not interfere with the locking arm projection and the rotation locking lever is rotated forward, the rotation locking shaft and the rotation locking member also rotate forward together, and the locking interference projection is such that the disk forces the valve seat to close. It is characterized in that the rotation of the arm axis is locked by interfering with the locking arm projection.

In addition, the rotary locking actuator includes a hydraulic cylinder in which a piston installed inside operates according to the supply of hydraulic pressure, one end is connected to the piston, and the other end is connected to the rotary locking lever, so that when the piston is introduced into the hydraulic cylinder, A piston rod that reversely rotates the rotational locking lever and rotates the rotational locking lever forward when withdrawn, and a rotational locking spring installed inside the hydraulic cylinder and providing spring force in the direction in which the piston rod is withdrawn. It is characterized by

In addition, the rotation locking actuator includes a contact sensing member installed on the piston rod, a retraction detection limit switch that contacts the contact sensing member to detect the retracted state of the piston rod, and a contact sensing member that contacts the contact sensing member to detect the retracted state of the piston rod. It is characterized in that it further includes a withdrawal detection limit switch that detects the state in which the piston rod is withdrawn.

The swing check valve according to the present invention can perform its original check function smoothly and has a simple configuration when necessary through a locking means that locks the rotation of the arm axis of the rotating arm that rotates the disk without deforming or damaging the valve body. Fluid flow in both directions can be completely blocked, improving the convenience of manufacturing and assembly.

In addition, as the pressure difference between the inlet and outlet continuously changes, the rotation of the arm axis, which is the rotation axis of the disk, can be directly locked through the locking means even when the disk cannot completely close the inlet or the disk is open, so that the rotation of the arm axis, which is the rotation axis of the disk, can be directly locked when necessary. It has the effect of completely blocking it.

1 is a side view showing an embodiment of a swing check valve according to the present invention,
Figure 2 is a front view of the embodiment of Figure 1;
Figure 3 is a side cross-sectional view taken along line A-A' of the embodiment of Figure 2;
Figure 4 is a side cross-sectional view showing a state in which the disc opens the valve seat so that fluid flows from the front inlet to the rear outlet in the embodiment of Figure 3;
Figure 5 is a plan cross-sectional view taken along line B-B' of the embodiment of Figure 2;
Figure 6 is an enlarged plan cross-sectional view of the main part of the hinge axis, arm axis, and locking means installed on the valve body in the embodiment of Figure 5;
Figure 7 is an exploded perspective view of the main part of the embodiment of Figure 5, enlarged and showing the hinge axis, arm axis, and locking means;
Figure 8 is an exploded perspective view of the main part of the embodiment of Figure 7 viewed from a different angle;
Figure 9 is an enlarged side cross-sectional view of the main part of the rotary locking lever and the rotary locking actuator in the embodiment of Figure 1;
Figures 10 and 11 are an enlarged perspective view of the main part of the embodiment of Figure 9 showing the process in which the disc performs the check function of opening and closing the valve seat when the rotation locking lever is reversely rotated;
FIG. 12 is an enlarged side cross-sectional view of the main part of the embodiment of FIG. 9 showing the state in which the pivoting locking lever is rotated forward by the operation of the pivoting locking actuator;
Figure 13 is an enlarged perspective view of the main part of the embodiment of Figure 12 showing the state in which the disk forcibly closes the valve seat when the rotation locking lever is rotated forward.

Hereinafter, a preferred embodiment of the swing check valve according to the present invention will be described in detail with reference to the attached drawings.

The swing check valve according to the present invention includes a valve body 100, a hinge shaft 200, a rotating arm 300, a disk 400, and a locking means 500, as shown in FIGS. 1 to 13. . In addition, the rotating arm 300 includes an arm axis 310 and a locking arm projection 320, and the locking means 500 includes a rotating locking member 510, a rotating locking shaft 520, and a rotating locking lever ( 530) and a rotating locking actuator 540. In addition, the rotational locking actuator 540 includes a hydraulic cylinder 541, a piston rod 542, a rotational locking spring 543, a contact detection member 544, an entry detection limit switch 545, and an withdrawal detection limit switch 546. ) may include.

As shown in FIGS. 1 to 5, the valve body 100 has a front inlet 110 and a rear outlet 120 in communication through a central internal flow path 130, and the inside is directed toward the inlet 110. An annular valve seat 140 is fixedly installed in the flow path 130. This valve body 100 is connected to the inlet pipe and the outlet pipe through flanges (not shown) formed at the inlet 110 and outlet 120 on the pipe through which fluid flows. The valve seat 140 contacts the disk 400, which will be described later, and blocks the flow of fluid flowing back from the outlet 120 to the inlet 110 or the bidirectional flow between the inlet 110 and the outlet 120.

The hinge shaft 200 is installed inside the valve body 100 above the valve seat 140, as shown in FIGS. 3 to 8. This hinge axis 200 becomes the rotation center of the pivot arm 300, which will be described later, and is configured to rotationally support the hinge axis 200 through a bushing or bearing, etc. (not shown).

As shown in FIGS. 2 to 8, the rotating arm 300 has one end of the arm axis 310 inserted into the hinge axis 200 and rotates around the hinge axis 200. That is, the arm axis 310 of the rotating arm 300 is inserted into the hinge axis 200 and rotates freely, and the other end is coupled to the disk 400, which will be described later, and the valve seat ( 140).

The disk 400 has a disk shape as shown in FIGS. 2 to 5, 7, and 8, and the front is connected to the other end of the rotating arm 300 so that the front opens and closes the valve seat 140 of the valve body 100. They are coupled and rotated together, and the valve seat 140 is opened to allow fluid to flow from the inlet 110 to the outlet 120, but the valve seat 140 is closed to prevent fluid from flowing in the opposite direction. .

That is, as shown in FIG. 3, when there is no fluid flow from the inlet 110 of the valve body 100 or when the pressure at the outlet 120 is higher than the pressure at the inlet 110, the self-weight of the disk 400 As a result, the front of the disk 400 closes the valve seat 140 of the valve body 100. Conversely, as shown in FIG. 4, when a fluid flow occurs from the inlet 110 of the valve body 100, the force of the self-weight of the disk 400 is overcome by the pressure of the fluid and the arm axis is centered around the hinge axis 200. As (310) rotates together with the rotating arm (300), the disk (400) is rotated so that the front of the disk (400) opens the valve seat (140) of the valve body (100). Accordingly, fluid flows from the inlet 110 to the outlet 120.

Through the above-described valve body 100, hinge shaft 200, pivot arm 300, and disk 400, a check function can be performed to prevent backflow of fluid so that fluid flows in only one direction. Here, the above-described check function can be smoothly performed through the locking means 500, which will be described later, and fluid flow in both directions can be completely closed when necessary with a simple configuration without deforming or damaging the valve body 100. .

That is, the locking means 500 selectively interferes with the arm axis 310 of the pivoting arm 300, as shown in FIGS. 1, 2, and 5 to 13, so that the disk 400 moves into the valve seat 140. The rotation of the arm axis 310 is locked so that it is forcibly closed.

In order for this locking means 500 to selectively interfere with the arm axis 310 to lock the rotation of the arm axis 310, first, the rotation arm 300 is installed on one side of the arm axis 310 along the coaxial direction. It includes a locking arm protrusion 320 protruding in a half-ring shape. That is, the locking arm protrusion 320 has a semi-ring shape, which is half of a complete ring, in other words, a half ring 321 shape, as shown in FIGS. 7, 8, 10, 11, and 13, and the remaining half is empty, That is, it can be divided into an empty half (322) excluding the locking arm protrusion (320).

At this time, the locking means 500 specifically includes a rotational locking member 510, a rotational locking shaft 520, a rotational locking lever 530, and a rotational locking actuator 540, as shown in FIGS. 1, 2, and 5 to 13. ) includes.

As shown in FIGS. 7, 8, 10, 11, and 13, the rotational locking member 510 has a cylindrical shape and is rotatably installed on the same axis as the hinge axis 200, and the locking arm of the arm axis 310 A locking interference protrusion 511 in the shape of a quarter ring is formed to protrude along the coaxial direction on one side so as to be located in the empty half 322 excluding the protrusion 320. That is, the locking arm projection 320 has an angle of 180 degrees with the half ring 321, and the empty half 322 also has an angle of 180 degrees. When the quarter ring, which is the locking interference protrusion 511, has an angle of 90 degrees, which is 1/4, when the locking interference protrusion 511 is inserted and positioned in the empty half 322, it can rotate by an angle of 90 degrees.

Here, the disk 400 rotates only at an angle of approximately 30 to 45 degrees with the arm axis 310 and the hinge axis 200 as the rotation center, so the rotation locking member 510 is rotated to form the locking interference protrusion 511. By selectively interfering with the locking arm protrusion 320 of the arm axis 310, the disk 400 can lock the rotation of the arm axis 310 to forcibly close the valve seat 140.

In order to selectively rotate the rotational locking member 510, the locking means 500 includes a rotational locking shaft 520, one side of which is coaxially coupled to the other side of the rotational locking member 510 and rotates together, and It includes a rotational locking lever 530 that is coupled to the other side of the locking shaft 520 to rotate the rotational locking shaft 520, and a rotational locking actuator 540 that rotates the rotational locking lever 530 forward and backward.

At this time, one side of the rotational locking shaft 520 is coupled to the other side of the rotational locking member 510 with a key 521, as shown in Figures 5 to 8. That is, the key 521 combination is used as an example to couple one side of the rotation locking shaft 520 so that it can rotate together while being coaxially inserted into the other side of the rotation locking member 510. However, the spline (spline) It may be a combination through bonding or coupling. In addition, the rotational locking shaft 520 is coupled to the rotational locking lever 530 and rotates together according to the forward and reverse rotation of the rotational locking lever 530, and this rotational locking lever 530 is operated by the rotational locking actuator 540. It rotates forward and backward.

When the rotational locking actuator 540 reversely rotates the rotational locking lever 530 as shown in FIG. 9, the rotational locking shaft 520 and the rotational locking member 510 as shown in FIGS. 10 and 11 also rotates in reverse, and the locking interference protrusion 511 does not interfere with the locking arm protrusion 320 so that the disk 400 can perform a check function of opening and closing the valve seat 140.

Conversely, when the rotational locking actuator 540 rotates the rotational locking lever 530 forward as shown in FIG. 12, the rotational locking shaft 520 and the rotational locking member 510 as shown in FIG. 13 also rotates forward, and the locking interference protrusion 511 interferes with the locking arm protrusion 320 to lock the rotation of the arm axis 310 so that the disk 400 forcibly closes the valve seat 140. do.

As shown in FIGS. 9 and 12, this rotating locking actuator 540 has a hydraulic cylinder 541 in which a piston 541a installed inside operates according to the supply of hydraulic pressure, and one end is inserted into the hydraulic cylinder 541. A piston rod 542 that reversely rotates the rotational locking lever 530 when retracted and forwardly rotates the rotational locking lever 530 when withdrawn is installed inside the hydraulic cylinder 541, and the piston rod ( 542) may include a rotating locking spring 543 that provides spring force in the direction in which it is pulled out.

As shown in Figures 9 and 12, the hydraulic cylinder 541 pulls in and out the piston rod 542 by operating the piston 541a according to the supply of hydraulic pressure, thereby rotating the rotating locking lever 530 forward and backward. Accordingly, as shown in FIGS. 10 and 11 or FIG. 13, the locking interference protrusion 511 selectively interferes with the locking arm protrusion 320 to ensure that the check function of the disk 400 is smoothly performed or to force it to close. The rotation of the arm axis 310 is locked or unlocked.

At this time, if the system goes down due to a malfunction of the pump or other critical reasons, the supply of hydraulic pressure to the hydraulic cylinder 541 may also not be smoothly achieved, so the disk 400 is connected through the rotating locking spring 543. It can be completely closed. That is, even if the system is down, the rotating locking spring 543 provides spring force in the direction in which the piston rod 542 is pulled out as shown in FIG. 12, so the disk 400 operates as a valve as shown in FIG. 13. It can be operated to forcibly close the seat 140.

Meanwhile, the rotation locking actuator 540 contacts the contact sensing member 544 installed on the piston rod 542, as shown in FIGS. 9 and 12, and contacts the contact sensing member 544 to detect the piston rod ( A retraction detection limit switch 545 that detects the state in which the piston rod 542 (542) is retracted, and a withdrawal detection limit switch 546 that detects the state in which the piston rod 542 is withdrawn by contacting the contact detection member 544. It can be included. Through this, it can be confirmed whether the piston rod 542 of the rotational locking actuator 540 is retracted or withdrawn, which means that the locking means 500 locks the rotation of the arm axis 310 so that the disk 400 moves the valve seat 140. ) can be forcibly closed or unlocked to check whether the check function of the disk 400 is being performed smoothly.

As described above, the swing check valve according to the present invention has an arm axis of the rotating arm 300 that rotates the disk 400 without deforming or damaging the valve body 100 while smoothly performing the original check function. Through the locking means 500 that locks the rotation of 310, fluid flow in both directions can be completely closed when necessary with a simple configuration, thereby improving the convenience of manufacturing and assembly.

In addition, as the pressure difference between the inlet 110 and the outlet 120 continuously changes, the disk 400 cannot completely close the inlet 110 or the locking means 500 is used even when the disk 400 is open. Through this, the rotation of the arm axis 310, which is the rotation axis of the disk 400, can be directly locked, which has the effect of completely closing the disk 400 when necessary.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters stated in the claims, and those skilled in the art can improve and change the technical idea of the present invention into various forms. Therefore, such improvements and changes will fall within the scope of protection of the present invention as long as they are obvious to those skilled in the art.

100: Valve body
110: inlet 120: outlet
130: internal flow path 140: valve seat
200: Hinge axis
300: rotating arm
310: Arm axis 320: Locking arm projection
321: half-ring 322: vacant-half
400: disk
500: Locking means
510: Rotating locking member 511: Locking interference protrusion
520: Rotating locking axis 521: Key
530: Rotating locking lever
540: Rotating locking actuator
541: Hydraulic cylinder 541a: Piston
542: Piston rod 543: Rotating locking spring
544: Contact sensing member 545: Intrusion detection limit switch
546: Withdrawal detection limit switch

Claims (6)

A valve body in which a front inlet and a rear outlet communicate through a central internal passage, and an annular valve seat is fixedly installed in the internal passage in the direction of the inlet;
A hinge axis installed inside the valve body above the valve seat,
a rotating arm in which one arm axis is inserted into the hinge axis and rotates around the hinge axis;
The rear side is coupled to the other end of the rotating arm and rotates together so that the front side opens and closes the valve seat of the valve body, and the valve seat is opened so that fluid flows from the inlet to the outlet, but fluid does not flow in the opposite direction. A disc-shaped disk that closes the valve seat to prevent
A swing check valve comprising a locking means for selectively interfering with the arm axis of the rotation arm and locking the rotation of the arm axis so that the disk forcibly closes the valve seat.
According to paragraph 1,
The rotating arm is,
It further includes a locking arm protrusion formed to protrude in a half-ring shape along the coaxial direction on one side of the arm axis,
The locking means is,
It is cylindrical and rotatably installed coaxially with the hinge axis, and has a quarter-ring shape along the coaxial direction on one side so as to be located in the empty half excluding the locking arm protrusion of the arm axis. A rotary locking member in which a locking interference protrusion is formed to protrude,
a rotational locking shaft, one side of which is coaxially coupled to the other side of the rotational locking member and rotating together;
a rotational locking lever coupled to the other side of the rotational locking shaft and rotating the rotational locking shaft;
A swing check valve comprising a rotational locking actuator that rotates the rotational locking lever forward and backward.
According to paragraph 2,
The rotating locking axis is,
A swing check valve, characterized in that one side is keyed to the other side of the rotation locking member.
According to paragraph 2,
The rotating locking actuator,
When the rotational locking lever is reversely rotated, the rotational locking shaft and the rotational locking member also rotate in reverse, and the locking interference protrusion interferes with the locking arm projection so that the disk can perform a check function of opening and closing the valve seat. without doing,
When the rotational locking lever is rotated forward, the rotational locking shaft and the rotational locking member are also rotated forward together, and the locking interference protrusion interferes with the locking arm projection so that the disk forcibly closes the valve seat to prevent rotation of the arm axis. A swing check valve characterized by locking.
According to paragraph 4,
The rotating locking actuator,
A hydraulic cylinder in which a piston installed inside operates according to the supply of hydraulic pressure,
A piston rod, one end of which is connected to the piston and the other end of which is connected to the rotational locking lever, which rotates the rotational locking lever in reverse when drawn into the interior of the hydraulic cylinder and rotates the rotational locking lever forward when withdrawn;
A swing check valve installed inside the hydraulic cylinder and comprising a rotating locking spring that provides spring force in a direction in which the piston rod is withdrawn.
According to clause 5,
The rotating locking actuator,
A contact sensing member installed on the piston rod,
A retraction detection limit switch that contacts the contact sensing member and detects the retracted state of the piston rod;
A swing check valve further comprising a withdrawal detection limit switch that contacts the contact sensing member and detects a state in which the piston rod is withdrawn.

Images