WO2023054814A1

WO2023054814A1 - Safety valve having damping function

Info

Publication number: WO2023054814A1
Application number: PCT/KR2021/019039
Authority: WO
Inventors: 김동열; 김영민; 이민구
Original assignee: (주) 케이투앤
Priority date: 2021-09-30
Filing date: 2021-12-15
Publication date: 2023-04-06
Also published as: KR102466778B1; CN116209849A; KR102373717B1; TW202332851A; TWI836632B

Abstract

A safety valve having a damping function according to an embodiment of the present invention comprises: a body portion having a disc, to which a spindle is axially coupled, provided therein so that, when a fluid flows in the body portion through a sheet and reaches a set pressure, the disc moves up and the fluid is discharged through an outlet; a compressor which is coupled to the spindle at one side of a flange provided on the body portion so as to surround the spindle, and which comprises a spring compressed when the spindle moves up along with the disc and a lower plate attached to one end portion of the spring facing the flange; and a damper portion which is provided on the flange and has an inside space formed as a chamber space with air so that the descending speed of the lower plate is decreased by the resistance of the air in the chamber space when the lower plate descends.

Description

Safety valve with damping function

The present invention relates to a safety valve having a damping function, and more particularly, when the lower plate of the compression part is lowered, the lowering speed is reduced by the damper part, thereby reducing the degree of impact of the disk against the seat. It relates to a safety valve capable of preventing damage and minimizing cost by having a structure capable of mounting a damper unit and a compression plate to a conventional body unit.

The safety valve, for example, when the pressure inside the tank or pipeline rises, opens at a predetermined set pressure to discharge steam or gas to the outside to prevent damage or explosion of the tank or pipeline due to high pressure. It's a valve that works.

These safety valves may be classified into direct-actuated, pilot-actuated, spring-actuated, and the like depending on their shape or use.

Here, the spring-actuated safety valve is mainly used when a relatively high set pressure is required, and has a structure in which the set pressure is implemented using a spring mounted inside the valve.

Conventional safety valves generally have a configuration in which fluid flows into the seat through an inlet nozzle provided on the body of the valve, and at this time, when the pressure of the fluid is higher than the set pressure, the disk is instantly lifted and the fluid is discharged through the discharge port. .

When manufacturing such a safety valve, it is important to manufacture the disc and seat so that no leakage occurs through lapping, and it is also important to prevent damage to the part where the disc and seat come into contact with each other as the opening and closing operations are repeated. do.

However, in the conventional safety valve, when the disk is momentarily lifted from the seat and then returned to its original state, an instantaneous impact may be applied to the disk and the seat, so that the disk, seat or disk holder surrounding the disk may be damaged. may occur.

Therefore, there is a demand for the development of a safety valve with a new configuration capable of preventing component damage by reducing the amount of impact of the disk relative to the seat when the disk ascends or descends from the seat.

As related prior art, there is Korean Patent Publication No. 10-2010-0013392 (title of the invention: spring operated safety valve) and the like.

In the embodiment of the present invention, when the lower plate of the compression unit is lowered, the lowering speed is reduced by the damper unit, thereby reducing the degree of impact of the disc on the seat, thereby preventing damage to parts, and also in the conventional body unit. A safety valve having a damping function capable of minimizing cost by having a structure capable of mounting a damper unit and a compression plate is provided.

The problem to be solved by the present invention is not limited to the above-mentioned problem (s), and another problem (s) not mentioned will be clearly understood by those skilled in the art from the following description.

In the safety valve having a damping function according to an embodiment of the present invention, a disk to which a spindle is axially coupled is provided inside, and when fluid flows in through a seat and reaches a set pressure, the disk rises and the fluid flows through the outlet. A body part flowing out, a spring coupled to the spindle so as to surround the spindle at one side of a flange provided in the body part, and compressed when the spindle is raised together with the disk, and one end of the spring facing the flange. It is provided on a compression part including a lower plate mounted on the lower plate and the flange, and the inner space is formed as a chamber space with air, so that when the lower plate is lowered, the lower plate is lowered by resistance of the air existing in the chamber space. It may include a damper unit for reducing the descending speed of.

In addition, according to an embodiment of the present invention, an inner wall of the body part on one side of the flange may be provided with a stepped groove formed stepwise in a wall thickness direction, and a side portion of the damper unit may be fitted into the stepped groove.

In addition, at least one air hole is formed in the lower plate according to an embodiment of the present invention, so that when the lower plate is inserted into the chamber space of the damper unit, air in the chamber space escapes through the air hole. At least a portion of the air hole facing the spring may be formed in a funnel shape so that air is moved to the chamber space through the air hole when the lower plate rises from the chamber space of the damper unit.

In addition, at least a portion of the air hole according to an embodiment of the present invention may be formed with a groove in a spiral direction for increasing the moving speed of the air.

In addition, the lower plate according to an embodiment of the present invention includes a spring insertion portion inserted into one end of the spring, a circular plate portion integrally provided with the spring insertion portion and inserted into the chamber space of the damper unit, and It may include a plurality of air holes regularly arranged at equal angles in the spring insertion part and the plate part.

In addition, the maximum outer diameter of the plate part according to the embodiment of the present invention may be equal to or smaller than the maximum inner diameter of the sidewall of the damper part forming the chamber space.

In addition, according to an embodiment of the present invention, the outer side of the lower end of the plate portion may be formed as an inclined surface, and the inner side of the upper end of the sidewall of the damper unit may be formed as an inclined surface.

In addition, an inclination angle of an inclined surface of the plate portion according to an embodiment of the present invention may be equal to or greater than an inclined angle of an inclined surface of the sidewall of the damper unit.

In addition, the flange according to an embodiment of the present invention is formed in an inward direction from one surface on which the lower plate is seated to reduce the sound pressure generated when the lower plate is raised and lowered with respect to the damper unit. A sound pressure reducing groove may be provided. there is.

In addition, the safety valve according to an embodiment of the present invention is provided stepwise on the inner wall of the body part where the compression part is disposed, and contracts the bellows mounted on the spindle at the lower part of the flange by limiting the rise of the lower plate. A stopper for limiting the degree may be further included.

According to an embodiment of the present invention, when the lower plate of the compression unit is lowered, the lowering speed is reduced by the damper unit, thereby reducing the degree of impact of the disc on the seat, thereby preventing damage to parts, and also preventing damage to parts. Costs can be minimized by having a structure capable of mounting the damper unit and the compression plate to the unit.

In addition, by having a structure that prevents parts constituting the valve from being corroded by fluid, costs required for replacement or maintenance can be reduced.

1 is a diagram showing the internal configuration of a safety valve having a damping function according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 .

FIG. 3 is a view showing a state in which the lower plate of the compression unit in FIG. 2 is lowered into the damper unit.

FIG. 4 is the diagrams shown in FIGS. 2 and 3 for explaining the movement of air when the lower plate moves with respect to the damper unit.

5 is a view showing that a hydraulic pressure reducing groove is provided in a safety valve according to another embodiment of the present invention.

6 is a view showing that a stopper is provided in a safety valve according to another embodiment of the present invention.

Advantages and/or features of the present invention, and methods of achieving them, will become apparent with reference to the following detailed description of the embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various forms different from each other, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the internal configuration of a safety valve having a damping function according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a lower plate of the compression unit in FIG. 2 is a damper 4 is a view illustrating the movement of air when the lower plate moves with respect to the damper unit as shown in FIGS. 2 and 3 .

As shown in these drawings, the safety valve 100 having a damping function according to an embodiment of the present invention is mounted, for example, in a tank or pipeline, and when the internal pressure rises above the set pressure, temporarily As a valve that is opened to discharge fluid to the outside, the body portion 110 forming a basic frame, the compression portion 130 provided on the upper side of the flange 115 provided in the body portion 110, and the flange 115 ) It may include a damper unit 150 provided on the compression unit 130 and interacting with the lower plate 140 provided to reduce the lowering speed of the lower plate 140 .

By this configuration, when the disk 120 moves up and down with respect to the seat 113 within the body portion 110, in particular, when the disk 120 descends, the lowering speed of the disk 120 is reduced, thereby reducing the seat 113 or the disk 113. (120) can be prevented from being damaged.

Describing each configuration, the body part 110 of this embodiment, as shown in FIG. 1, forms a basic appearance, and includes a lower body 111 in which an inlet 112 through which fluid flows is formed, and An upper body 117 to which the compression part 130 to be performed is mounted so as to be able to move up and down, a flange 115 connecting the lower body 111 and the upper body 117, and an inlet provided in the lateral direction from the lower body 111 An outlet 114 for discharging the fluid introduced through 112 may be included.

In the lower body 111, a seat 113 is provided in communication with the inlet 112 and through which the fluid introduced into the inlet 112 passes, and a disk 120 that opens and closes the seat 113 at the top of the seat 113. ) is provided to be able to move up and down, such a disk 120 is provided at the bottom of the compression unit 130 to be described later, and can close or open the seat 113 while moving up and down with the movement of the compression unit 130.

With respect to the seat 113, the disk 120 basically maintains a closed state. For example, when the internal pressure in the body 110 exceeds a set pressure, the disk 120 opens with respect to the seat 113, and the internal pressure When the pressure is less than this set pressure, the disc 120 descends to the seat 113 and closes.

However, if the instantaneous descending speed is fast when the disk 120 descends, a significant impact may be applied to the disk 120, the seat 113, and the disk holder 121 surrounding the disk 120, which is due to their breakage. can be connected Therefore, if there is a structure that reduces the descending speed while ensuring the descending of the disk 120, the problem of component damage can be solved.

Accordingly, in the present embodiment, a damper unit 150 capable of reducing the descending speed of the disk 120 is provided. Prior to explaining the damper unit 150, the disc The configuration of the compression unit 130 that operates 120 will be described.

The compression unit 130 of this embodiment includes a spindle 131 having one end mounted on the disk 120 and a spring 133 coupled to the spindle 131 so as to surround the spindle 131 in the upper body 117. And, a lower plate 140 mounted on the lower end of the spring 133 facing the flange 115, an upper plate 135 mounted on the upper end of the spring 133, and a spindle 131 in the lower body 111 ) may include a bellows 134 mounted to surround it.

In addition, referring to FIG. 1, an adjustment screw 138 is mounted on the upper end of the upper body 117, and the spindle 131 is disposed to pass through the screw 138, so that the spindle 131 moves up and down when the spindle 131 moves up and down. (131) can be precisely maintained.

Referring to FIG. 1, an adjusting screw 138 surrounds the spindle 131 so as to be movable up and down, and a spring 133 surrounds the spindle 131 at the bottom thereof, and an upper plate mounted on top of the spring 133. Since the 135 and the adjustment screw 138 are connected by the bearing 136 structure, the spindle 131 can move up and down smoothly and accurately with respect to the adjustment screw 138 .

1 and 2, the lower end of the spindle 131 is wrapped with a bellows 134, which is compressed when the spindle 131 is raised by the compression of the spring 133, and then When the spindle 131 returns to its original state, the bellows 134 may also return to its original state.

The compression unit 130 enables the disc 120 to move up and down relative to the seat 113 according to the set pressure. It is possible to reduce the descending speed of the part and thus prevent the occurrence of component damage.

As shown in FIGS. 2 and 3, the damper unit 150 of this embodiment is provided on the upper surface of the flange 115, and is generally provided in a cylindrical shape or a circular ring shape with a short top and bottom, and its internal space is air It is formed as a chamber space (150S) in the.

Therefore, when the lower plate 140 of the above-described compression unit 130 is raised and then lowered again, the lower plate 140 may be lowered by resistance of air existing in the chamber space 150S, thereby reducing the lower plate 140. , thereby reducing the size of the impact of the disk 120 to the seat 113.

As shown in FIG. 2, the damper part 150 may be coupled to a stepped groove 118 formed stepwise on the inner wall of the lower end of the upper body 117 of the body part 110 on the upper side of the flange 115. there is. In other words, a stepped groove 118 corresponding to the shape of the side of the damper part 150 may be formed on the inner wall of the upper body 117, and the damper part 150 is fitted into the stepped groove 118, thereby The damper unit 150 may maintain a firm position.

The upper body 117 may have the standard of a conventional safety valve, and since the damper unit 150 can be mounted by forming the stepped groove 118 on the inner surface of the upper body 117, the cost required for equipment construction is reduced. Cost or labor can be reduced.

On the other hand, referring to FIG. 4, when a pressure higher than the set pressure is generated, the lower plate 140 is raised from the damper unit 150 and lowered when the set pressure is lowered. For this purpose, the outer shape of the lower plate 140 and the damper unit The shape of the chamber space 150S of 150 has a corresponding shape.

First, the lower plate 140 of this embodiment, as shown in FIGS. 2 to 4, is provided integrally with the spring insertion portion 141 inserted into the lower end of the spring 133 and the spring insertion portion 141, A circular plate portion 143 inserted into the chamber space 150S of the damper unit 150 may be included.

In addition, a plurality of air holes 145 are formed at regular angles in the lower plate 140 to allow air in the chamber space 150S to escape to the outside or conversely to allow air to enter the chamber space 150S again.

2 and 3, the maximum outer diameter of the plate portion 143 may be equal to or smaller than the maximum inner diameter of the sidewall 151 of the damper unit 150 forming the chamber space 150S, and thus the chamber space ( 150S) can be smoothly lowered or raised by the lower plate 140 .

2 and 3, when the lower plate 140 is inserted into the chamber space 150S, the air in the chamber space 150S moves through the plurality of air holes 145 formed in the lower plate 140. At this time, the air acts as a resistive force on the lower plate 140 and acts as a damper when the lower plate 140 is lowered to the damper unit 150, and escapes through the air hole 145, thereby reducing the chamber space 150S ) so that the lower plate 140 can be inserted.

On the other hand, referring to FIG. 2 , when a pressure higher than the set pressure is generated, the lower plate 140 is raised from the chamber space 150S. At this time, the air above the lower plate 140 passes through the air hole 145 again. By being moved to the chamber space 150S through this, the chamber space 150S may maintain a state in which there is air.

To this end, the air hole 145 may have a funnel shape as a whole, as shown in FIG. 2 , and due to the shape of the air hole 145, air may be smoothly moved.

Although not shown, a spiral groove may be formed in at least a portion of the air hole 145, for example, in a funnel portion whose width decreases toward the bottom, through which the air movement speed may be increased.

On the other hand, referring to FIG. 2, the outer side of the lower end of the plate part 143 is formed as an inclined surface 143a, and the upper inner side of the side wall 151 of the damper unit 150 is inclined surface 151a ) can be formed.

Here, the inclination angle (∠P) of the inclined surface 143a of the plate portion 143 may be equal to or greater than the inclination angle (∠D) of the inclined surface 151a of the sidewall 151 of the damper unit 150 . Therefore, when the lower plate 140 is lowered and inserted into the damper unit 150, the position of the lower plate 140 relative to the damper unit 150 is easily adjusted, thereby reducing the lower plate 140 relative to the damper unit 150. ) to avoid shaking.

In other words, even if the lower plate 140 is slightly lateral with respect to the damper unit 150, that is, even if the axial centers of the damper unit 150 and the lower plate 140 do not exactly coincide, the damper unit 150 When the lower plate 140 is lowered with respect to ), the inclined surface 143a of the lower plate 140 slides down with respect to the inclined surface 151a of the damper part 150, so that the lower plate 140 relative to the damper part 150 ) can be accurately aligned.

On the other hand, the safety valve 100 of this embodiment, as shown in FIG. 2, may include a leak prevention unit 165 provided between the flange 115 and the lower body 111 to prevent leakage of fluid. .

Referring to FIG. 2 , a pressure ring 160 for maintaining pressure may be provided between the flange 115 and the lower body 111, and a leak prevention unit between the bellows 134 and the flange 115 at the lower portion thereof. 165 may be provided, and the leakage preventing part 165 may prevent fluid flowing through the seat 113 from leaking to the flange 115 or the upper body 117 or to the outside.

In addition, the bellows 134 contracts or expands when the compression unit 130 of the present embodiment operates, and it is possible to prevent fluid from flowing into the spindle 131 or the like inside through the bellows 134, and thus the part This can prevent corrosion.

In this way, according to one embodiment of the present invention, when the lower plate 140 of the compression unit 130 is lowered, the lowering speed is reduced by the damper unit 150, so that the disk 120 relative to the seat 113 Damage to parts can be prevented by reducing the degree of impact generation, and costs can be minimized by having a structure in which the damper unit 150 and the compression plate can be mounted on the conventional body unit 110.

Meanwhile, in the following, a safety valve according to another embodiment of the present invention will be described, but a description of a configuration substantially corresponding to the safety valve of the above-described embodiment will be omitted.

As shown therein, the flange 215 of the safety valve 200 of the present embodiment is recessed from the upper surface in the inward direction to reduce the sound pressure generated when the lower plate 240 is raised and lowered with respect to the damper unit 250. A reduction groove 215h may be provided. The negative pressure reducing groove 215h may be a cylindrical groove as a whole.

For example, when the valve 200 of the present embodiment is closed by the lower plate 240 descending, when the negative pressure reducing groove 215h is not provided, and there is no air inside the damper unit 150, the air pressure A negative pressure may be generated when the valve 200 is opened.

However, when the negative pressure reducing groove 215h is provided as in the present embodiment, since there is air in the negative pressure reducing groove 215h, the generation of negative pressure can be reduced, and thus the valve 200 can be opened and closed more smoothly. .

Meanwhile, in the following, a safety valve according to another embodiment of the present invention will be described, but a description of a configuration substantially corresponding to the safety valve of the above-described embodiments will be omitted.

As shown therein, the safety valve 300 of this embodiment is provided stepwise on the inner wall of the upper body 317 of the body portion 310 and restricts the rise of the lower plate 340 to the lower portion of the flange 315. includes a stopper 370 that limits the contraction speed of the bellows 334 mounted on the spindle 331.

The stopper 370 can prevent compression of the bellows 334 by limiting the rise of the lower plate 340, thereby preventing deformation and breakage of the bellows 334 as well as preventing fluid leakage. Therefore, it is possible to prevent additional risks due to part damage or extraction.

Although specific embodiments according to the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the scope of the claims to be described later, but also those equivalent to the scope of these claims.

As described above, the present invention has been described by the limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art in the field to which the present invention belongs can make various modifications and transformation is possible Therefore, the spirit of the present invention should be grasped only by the claims described below, and all equivalent or equivalent modifications thereof will be said to belong to the scope of the spirit of the present invention.

Claims

A body portion in which a disk to which a spindle is coupled is provided therein, and when fluid flows in through a seat and reaches a set pressure, the disk rises and the fluid flows out through an outlet;

A spring coupled to the spindle so as to surround the spindle at one side of a flange provided in the body portion and compressed when the spindle is raised together with the disk, and a lower plate mounted on one end of the spring facing the flange. A compression unit comprising a; and

It is provided on the flange, and the inner space is formed as a chamber space with air, and a damper unit for reducing the descending speed of the lower plate by resistance of air existing in the chamber space when the lower plate descends is included. A safety valve with a damping function.
According to claim 1,

An inner wall of the body portion on one side of the flange is provided with a stepped groove formed stepwise in the wall thickness direction,

A safety valve with a damping function, characterized in that the side portion of the damper is fitted into the stepped groove.
According to claim 1,

At least one air hole is formed in the lower plate so that air in the chamber space escapes through the air hole when the lower plate is inserted into the chamber space of the damper unit;

When the lower plate rises from the chamber space of the damper part, at least a portion of the air hole toward the spring is formed in a funnel shape so that air is moved to the chamber space through the air hole. a safety valve.
According to claim 3,

A safety valve with a damping function, characterized in that at least a portion of the air hole is formed with a groove in a spiral direction for increasing the moving speed of the air.
According to claim 1,

The lower plate,

a spring insertion portion inserted into one end of the spring;

a circular plate part integrally provided with the spring insertion part and inserted into the chamber space of the damper part; and

A safety valve with a damping function, characterized in that it includes a plurality of air holes regularly arranged at equal angles in the spring insertion part and the plate part.
According to claim 5,

A safety valve with a damping function, characterized in that the maximum outer diameter of the plate portion is equal to or smaller than the maximum inner diameter of the sidewall of the damper part forming the chamber space.
According to claim 6,

A safety valve with a damping function, characterized in that the outer side of the lower end of the plate portion is formed as an inclined surface, and the inner side of the upper end of the sidewall of the damper part is formed as an inclined surface.
According to claim 7,

The safety valve with a damping function, characterized in that the angle of inclination of the inclined surface of the plate portion is equal to or greater than the angle of inclination of the inclined surface of the side wall of the damper part.
According to claim 1,

Safety with a damping function, characterized in that the flange is provided with a sound pressure reducing groove formed in an inward direction from one surface on which the lower plate is seated to reduce the sound pressure generated when the lower plate is raised and lowered with respect to the damper unit valve.
According to claim 1,

Further comprising a stopper provided with a step on the inner wall of the body portion where the compression portion is disposed and limiting the degree of contraction of the bellows mounted on the spindle at the lower portion of the flange by limiting the rise of the lower plate. Characterized in that Safety valve with damping function.