KR20230089587A - Anti-stick system for safety valve having function of control periodic operating - Google Patents

Abstract

The present invention relates to an automatic anti-seizing system of a safety valve with an adjustable operating cycle, which fundamentally prevents an accident, comprising: a flow rate control unit (100) provided with a bypass pipe (120) and a flow control rod (140); a pressure amplification unit (200); a switching unit (300) having an operating spring (330) and a tube (340); and an operating unit (400) having a movable cover (420).

Description

Anti-stick system for safety valve having function of control periodic operating}

The present invention relates to an automatic sticking prevention system for safety valves, and more specifically, to fundamentally prevent the occurrence of safety accidents due to the precipitation of foreign substances as the safety valve operates regularly at regular intervals to discharge foreign substances together with fluid to the outside. It is possible to do this, and it relates to an automatic sticking prevention system of a safety valve capable of artificially adjusting the operating cycle of the safety valve according to the temperature of the fluid or the capacity of the pressure container.

In industrial boilers as well as household boilers, pressure containers for storing high-pressure fluids such as steam are provided. This often occurs, and the surplus pressure due to such overpressure is generally relieved by using a safety valve.

On the other hand, in the process of evaporating water containing foreign substances and using it as steam, foreign substances are deposited inside the safety valve for a long time, or foreign substances attached to the inner surface of the pipe move along the pipe in a state of being peeled off by high-temperature steam. When deposited inside the safety valve for a long time, a sticking phenomenon in which parts stick to each other occurs, and this sticking phenomenon mainly occurs between the disk and seat of the safety valve.

In a safety valve, the disk and seat are direct parts related to the discharge of fluid. If foreign substances are deposited and the disk adheres to the seat, the pressure container explodes as the surplus pressure is not resolved, resulting in property damage as well as human accidents. There are serious problems that arise. Therefore, in the related industry, as shown in FIG. 5, the operating lever 10 is installed on the safety valve 1 to periodically discharge the fluid to the outside while removing foreign substances deposited between the disk and the seat together. Method is used. .

However, the method using such an operating lever is not only very cumbersome in that the manager has to perform it manually according to a set time or date interval, but also if the fluid is not properly discharged according to the set time interval, depending on the degree of surplus pressure There is a possibility of an explosion occurring at any time. In addition, in most cases, the safety valve is not easily accessible in that it is installed at the top of the boiler or pressure vessel, and thus the risk is substantially doubled in that management may be neglected.

Republic of Korea Registered Utility Model No. 0217151

The present invention has been proposed to improve the problems of the prior art, and an object of the present invention is to automatically discharge the fluid at regular time intervals without operator intervention, as well as to reduce the operation cycle of the safety valve related to fluid discharge. It is to provide a system for preventing sticking of a safety valve that can be artificially adjusted.

In order to achieve this object, the present invention is connected to the pressure container 10 by being mediated by the induction pipe 20, and the disc coupled to the lower end of the stem 35 by the pressure of the high-pressure fluid stored in the pressure container 10. (34) compresses the spring (36) and opens the seat (31) while discharging some of the high-pressure fluid stored in the pressure container (10) to the outside through the exhaust port (33) of the valve body (32). ) As a system for preventing the sticking of the safety valve 30 that relieves the pressure, a branch pipe 110 communicating and connected to the induction pipe 20, an inflow passage 121 communicating with the branch pipe 110, and an inflow A discharge passage 123 communicating with the flow passage 121 is formed and is located between the bypass pipe 120 connected to the branch pipe 110, the inflow passage 121 and the discharge passage 123 to form the inflow passage 121. A flow control unit 100 provided with a flow control bar 140 for controlling the amount of fluid inflow through; The injection hole 211 formed in the lower part is connected to the discharge passage 123 of the bypass pipe 120 and the pressure amplification unit 200 in which the fluid supplied through the discharge passage 123 is temporarily stored; The lower part of the operating body 310 is connected to the discharge hole 213 formed in the upper part of the pressure amplifying unit 200, the lower part faces the discharge hole 213 of the pressure amplifying part 200, and the upper part An operating rod 320 extending to an upper portion inside the operating body 310, an operating spring 330 located inside the operating body 310 and providing a restoring force to the operating rod 320, one end portion of the operating body ( 310) is connected to the upper part and the other part is provided with a tube 340 extending a certain length (300); The safety valve 30 is formed in an annular groove shape on the inside of the upper side of the bonnet 40, the upper side of which is opened, and the movable cylinder 410 communicating with the other end of the tube 340, the central axis of the safety valve 30 It is coupled to the upper part of the stem 35 and the operating part 400 provided with a movable cover 420 for sealing the upper part of the lower surface of the movable cylinder 410;

A first connection passage 125 is formed between the inflow passage 121 and the discharge passage 123 of the drift pipe 120; The support body 130 is inserted through the first connection passage 125, and the second connection communicates with the inflow passage 121 and the discharge passage 123 at the inner surface of the other side in the axial direction of the support body 130. a passage 131 and a through passage 133 are formed; In the axial direction of the support body 130, the flow control rod 140 having the head 141 provided at the other end is inserted through, and the head 141 of the flow control rod 140 is connected to the inflow passage 121. A space between the second connection passages 131 may be opened and closed.

At this time, the outer surface of one side of the flow control rod 140 is threaded with the inner surface of one side of the support body 130, and the head 141 of the flow control rod 140 and the support body 130 are connected. The distance between the inlets of the two connection passages 131 can be adjusted.

An annular seating groove 421 corresponding to the movable cylinder 410 is formed on the lower surface of the movable cover 420, and a packing ring 430 is placed in the seating groove 421 to move the movable cylinder 410. And it is possible to maintain the confidentiality between the movable cover (420).

The present invention connects a branch pipe to a pipe connected to a safety valve, diverts some of the fluid through the branch pipe, amplifies it inside a container of a certain size, and then operates it additionally to the stem coupled to the disk of the safety valve. By configuring it, even if the operator does not directly intervene to operate the safety valve, it is possible to fundamentally prevent the occurrence of safety accidents due to the precipitation of foreign substances as the safety valve operates regularly at regular intervals to discharge foreign substances to the outside along with the fluid. .

In addition, the present invention is configured to appropriately control the flow rate of the fluid supplied to the pressure amplification unit using the flow control rod, thereby artificially adjusting the operating cycle of the safety valve according to the temperature of the fluid or the capacity of the pressure container as necessary. It is possible to adjust with

1 is a schematic configuration diagram showing an automatic sticking prevention system for a safety valve according to the present invention.
Figure 2 is a schematic coupling configuration of the support body and the flow control rod in the automatic sticking prevention system of the safety valve according to the present invention.
Figure 3 is a schematic coupling configuration of the connection body and the operating rod in the automatic sticking prevention system of the safety valve according to the present invention.
4a to 4d are diagrams illustrating the operation of an automatic anti-sticking system for a safety valve according to the present invention.
5 is a configuration diagram of a safety valve provided with a conventional operating lever.

Looking at the preferred embodiment according to the present invention in detail with reference to the accompanying drawings, as follows, in detailing the embodiment of the present invention, there is no direct relationship with the technical features of the present invention, or A detailed description will be omitted for matters that are obvious to those skilled in the art.

The present invention relates to a system for automatically preventing the sticking of a safety valve, and as shown in FIG. There is a feature comprising the operating unit 400. Each of these configurations will be described in detail below.

The safety valve 30 is a means for relieving pressure inside the pressure vessel 10 in a boiler or the like, and is connected to the pressure vessel 10 through an induction pipe 20. The induction pipe 20 may be made of a conventional pipe having a certain length.

The pressure valve 30 may be composed of a configuration including a seat 31, a valve body 32, a disk 34, a stem 35, and a spring 36, like a general valve widely used in the related industry. there is.

The lower end of the seat 31 is coupled to the upper end of the guide tube 20 . The valve body 32 is coupled to the upper end of the seat 31, and an exhaust port 33 is provided at one side. The disk 34 is a part that opens and closes the seat 31, and its lower end is in contact with the upper end of the seat 31.

The lower end of the stem 35 is coupled to the upper central part of the disk 34, and the upper part extends in the inner axial direction of the valve body 32. The spring 36 is wrapped around the outside of the stem 35, and its lower end is in close contact with the upper surface of the disk 34, and its upper end is the inner upper surface of the valve body 32, or the stem (as shown in the drawing). 35). Reference numeral 40 denotes a portion coupled to the upper end of the valve body 32 as a bonnet, which will be described later.

The flow control unit 100 bypasses a portion of the fluid from the induction pipe 20 and arbitrarily adjusts the flow rate of the bypassed fluid to adjust the opening cycle of the safety valve 30. The branch pipe 110, the bypass It is characterized by including a pipe 120 and a flow control rod 140.

The branch pipe 110 communicates with and is connected to the induction pipe 20 . The branch pipe 110 may be formed of a T-shaped pipe in which the main pipe and the branch pipe 111 are provided as shown in the drawing, and in this case, the main pipe is preferably connected to the induction pipe 20.

The bypass pipe 120 is a part that diverts a portion of the fluid from the induction pipe 20, and has an inflow passage 121 and an outlet passage 123, respectively. At this time, the inflow passage 121 is connected to communicate with the branch pipe 110, and the discharge passage 123 communicates with the inflow passage 121. As shown in the drawing, the discharge passage 123 may be formed perpendicular to the inlet passage 121 and penetrating the upper portion of the bypass pipe 120 .

The flow control rod 140 is a means for controlling the inflow of fluid and is located between the inflow passage 121 and the discharge passage 123 . That is, the flow control rod 140 moves left and right at a predetermined interval in a state located between the inflow passage 121 and the discharge passage 123, and the other end portion controls the inflow amount of the fluid through the inflow passage 121. .

At this time, in the present invention, in locating the flow control rod 140 inside the bypass pipe 120, the support body 130 is inserted through the bypass pipe 120, and then the support body 130 A configuration in which the flow control rod 140 is inserted through the inner portion is proposed.

First, a first connection passage 125 is formed between the inflow passage 121 and the discharge passage 123 of the bypass pipe 120 . As shown in the drawing, the first connection passage 125 communicates with each of the inflow passage 121 and the discharge passage 123, faces the inflow passage 121, and is preferably formed on one side of the bypass pipe 120. And, it is preferable to have a larger diameter than the inflow passage 121.

As shown in FIG. 2, a second connection passage 131 and a through passage 133 are formed in the support body 130, and a screw thread 137 provided on one side of the outer surface is provided on one side of the inner surface of the bypass pipe 120. It is engaged with the provided screw thread 127 and coupled with the bypass pipe 130.

The second connection passage 131 is formed along the inner surface of the other side in the axial direction of the support body 130 and communicates with the inlet passage 121 of the bypass pipe 120 . The through passage 133 is perpendicular to the second connection passage 131 in a state of communication with the second connection passage 131 and may be formed penetrating both side surfaces of the support body 130 . Accordingly, the through passage 133 is also in communication with the discharge passage 123 of the bypass pipe 120 .

The flow control rod 140 penetrates and is inserted along the axial direction of the support body 130, and the head 141 is provided at the other end. The head 141 of the flow control rod 140 opens and closes between the inflow passage 121 of the bypass pipe 120 and the second connection passage 131 of the support body 130. As shown in the drawing, the outer surface portion of the head 141 and the other end portion of the second connection passage 131 may be made of inclined surfaces 142 and 132 and may be in close contact with each other.

In addition, at this time, as disclosed in FIG. 2, the present invention has threads 145 and 135 formed on one outer surface of the flow control rod 140 and one inner surface of the support body 130, respectively, and these threads are engaged. It does not rule out the case of Reference numeral 143 is an insertion groove for rotating the flow control rod 140.

As such, when the flow control rod 140 inserted through the support body 130 is screwed to the support body 130, when the flow control rod 140 is rotated in one direction (solid line), the head 141 and the second connection The gap between the other end of the flow passage 131 narrows, and when the flow control rod 140 is rotated in the other direction (dotted line), the gap between the head 141 and the other end of the second connection passage 131 widens.

The distance between the head 141 and the other end of the second connection passage 131 is directly related to the flow rate of fluid bypassed from the induction pipe 110 and supplied to the pressure amplifier 200 to be described later. Therefore, when the rotation direction and degree of rotation of the flow control rod 140 are appropriately adjusted, it is possible to artificially adjust the operating cycle (opening cycle) of the safety valve 30 .

The pressure amplification unit 200 is a part where the fluid supplied from the flow control unit 100 is temporarily stored, and an injection hole 211 connected to the discharge passage 123 of the bypass pipe 120 is formed at the lower part thereof. And, the discharge hole 213 is formed in the upper part. The pressure amplification unit 200 may be formed of a conventional pressure vessel made of a metal material or a metal-fiber mixture material.

The switching unit 300 is a part that operates the operation unit 400 to be described later by discharging the fluid stored in the pressure amplification unit 200 at once, and includes an operation body 310, an operation rod 320, and an operation spring 330. , including the tube 340.

The operating body 310 has upper and lower openings, and its lower part is connected to the discharge hole 213 of the pressure amplifier 200. The operating rod 320 is located inside the operating body 310, its lower end faces the discharge hole 213 of the pressure amplification unit 200, and its upper portion is the inner upper portion of the operating body 310. is extended to

At this time, as shown in FIG. 3, the head 321 is provided at the upper end of the operating rod 320, and inclined surfaces 323 and 313 are provided on the outer surface of the head 321 and the central portion of the flow path 311 of the operating body 310, respectively. ) may be formed. In this case, the movement of the fluid through the passage 311 of the operating body 310 can be more closely controlled by the head 321 .

The operating spring 330 is located in the passage 311 of the operating body 310 and provides restoring force to the operating rod 320 . The lower part of the actuating spring 330 may be coupled to the lower part of the actuating body 310 by a separate nut (reference numeral not shown), and the upper part of the actuating spring 330 is in close contact with the lower part of the inclined surface 313. and can be fixed.

That is, when the pressure of the fluid stored in the pressure amplifier 200 exceeds a certain value, the operating rod 320 compresses the operating spring 330 and rises vertically (solid line), thereby opening the flow path 311 to amplify the pressure. The fluid temporarily stored in the unit 200 is discharged, and when the fluid stored in the pressure amplification unit 200 is discharged, the pressure of the fluid decreases, and the operating rod 320 descends vertically according to the restoring force of the operating spring 330 (dotted line). ) flow path 311 is closed.

One end of the tube 340 is connected to the upper part of the operating body 310, and the other part extends a predetermined length. The tube 340 may be made of a metal tube, and first and second ports 350 and 360 may be interposed at both ends of the tube 340 as shown in the drawing. The first and second porters 350 and 360 may be made of conventional nozzles.

The operating unit 400 is a part that operates by transmitting additional vertically upward pressing force to the stem 35 of the safety valve 30, and includes a movable cylinder 410 and a movable cover 420.

As shown in the drawing, the movable cylinder 410 is formed on the upper portion of the bonnet 40 coupled to the upper portion of the valve body 32 as a cover of the valve body 32. The movable cylinder 410 has an annular groove shape and is characterized in that an upper portion is opened.

At this time, the upper portion of the stem 35 passes through the central axis of the bonnet 40, and a through hole 411 communicating with the movable cylinder 410 is formed on the side surface of the bonnet 40, and the through hole 411 The other end of the tube 340 is connected to , and when the second porter 360 is provided at the other end of the tube 340 , the second porter 360 is connected to the through hole 411 .

The movable cover 420 is located at the upper end of the bonnet 40, and the lower part seals the upper part of the movable cylinder 410. An upper end of the stem 35 of the safety valve 30 protruding through the central axis of the bonnet 40 is coupled to the central axis of the movable cover 420. The stem 35 and the movable cover 420 may be engaged with a screw thread.

At this time, the present invention proposes a configuration in which the packing ring 430 is interposed to the movable cover 430. The packing ring 430 is placed in a seating groove 421 formed in an annular shape on the lower surface of the movable cover 420, and the seating groove 421 preferably has a shape corresponding to the opening of the movable cylinder 410. .

Accordingly, the lower part of the packing ring 430 is in close contact with the opening of the movable cylinder 410 formed in an annular shape, and the movable cylinder 410 and the movable cover 420 in a state in which the movable cover 420 is not operated. Confidentiality between the two can be maintained more securely. The packing ring 430 is preferably made of an elastic material.

A schematic operation configuration of the present invention composed of such a configuration will be reviewed with reference to the above description and accompanying FIGS. 4A to 4D, respectively. For convenience of explanation, the fluid (G) is indicated in black.

When the pressure vessel 10 is filled with fluid G, the fluid G moves through the guide pipe 20 and the vertical pressure force of F1 by the fluid G on the bottom of the disk 34 of the safety valve 30 this works At this time, the vertical pressing force F1 of the fluid G acting on the bottom surface of the disk 34 is smaller than the restoring force F2 of the spring 36, so the flow path of the safety valve 30 remains closed by the disk 34.

On the other hand, some of the fluid moving through the induction pipe 20 bypasses the branch passage 111 of the branch pipe 110 as shown in FIG. 4A and then enters the bypass pipe 120 connected to the branch pipe 110 It flows into the second connection passage 132 through the gap between the other end of the second connection passage 132 of the support body 130 and the head 141 of the flow control rod 140 via the passage 121 .

Thereafter, the fluid sequentially moves through the flow passage 133 of the flow control rod 140 and the first connection passage 125 of the bypass pipe 120, respectively, as shown in FIG. 4B, and then through the discharge passage of the bypass pipe 120. It flows into the internal space of the pressure amplifier 200 through the injection hole 211 connected to 123 and is sequentially stored.

At this time, since each of F1 and F2 in the safety valve 30 is F2 > F1, the flow path remains closed. In addition, the vertical pressing force f1 acting on the operating rod 320 by the pressure of the fluid G filled in the internal space of the pressure amplifying unit 200 is smaller than the restoring force f2 of the operating spring 330, so that the passage of the operating body 310 ( 311) also remains closed.

When the fluid G is sufficiently filled in the internal space of the pressure amplification unit 200 after a certain period of time, and the pressure of the fluid G increases, the vertical pressing force acting on the operating rod 320 by the pressure of the fluid G f1 becomes greater than the restoring force f2 of the actuation spring 330, and accordingly, as shown in FIG. It is open.

When the flow path 311 of the operating body 310 is opened, the fluid G filled in the inner space of the pressure amplifier 200 moves quickly along the tube 340 and is formed on the upper part of the bonnet 40 The space of the pressure cylinder 410 is quickly filled. When the pressure cylinder 410 is sufficiently filled with the fluid G of a certain pressure, the vertical pressure f1 acts on the lower surface of the movable cover 420 by the fluid G filled in the pressure cylinder 410.

Accordingly, the vertical pressing force F1 by the fluid G moving through the guide tube 20 acts on the lower surface of the disk 34 coupled to the lower end of the stem 35, and the upper end of the stem 35 acts. The vertical pressing force f1 of the fluid G moving through the tube 340 acts on the lower surface of the movable cover 420 coupled with the spring 36 of the safety valve 30 When this branch becomes larger than the restoring force, the stem 35 gradually rises vertically upward.

When the stem 35 of the safety valve 35 rises vertically upwards, as shown in FIG. As it is discharged to the outside through 33, the surplus pressure in the pressure container 10 is relieved, and foreign substances precipitated between the disk 34 and the seat 31 are also removed from the safety valve 30, and the fluid is removed from the outside along with the fluid. is emitted with

On the other hand, since the pressure amplification unit 200 is filled with fluid G above a certain pressure, when the movable cover 420 opens the inner space of the movable cylinder 410 due to the vertical rise of the stem 35, As the fluid (G) filled in the movable cylinder 410 as well as the fluid (G) filled in the pressure amplification unit 200 moves quickly along the tube 340 and is discharged to the outside, the pressure amplification unit 200 ) The inside returns to its original state as shown in FIG. 4a.

When the fluid G filled in the pressure amplifier 200 is discharged, the operating rod 320 is returned to its original position by the restoring force of the operating spring 330, so that the flow path 311 of the operating body 310 is closed. do. When the passage 311 of the operating body 310 is closed, the supply of the fluid G to the pressure cylinder 410 through the tube 340 is stopped, and the vertical pressure applied to the lower surface of the pressure cover 420 disappears. .

When the vertical pressing force acting on the lower surface of the pressure cover 420 disappears, the force acting on the disk 34 of the safety valve 30 is the vertical pressing force due to the pressure of the fluid G moving through the induction pipe 20. Only F1 and the restoring force F2 of the spring 35 are F2 > F1, so the stem 35 moves vertically downward and returns to its original position, and finally the disk 34 comes into close contact with the upper end of the seat 31. and the flow is closed. Thereafter, the safety valve operates regularly while repeating the above-described processes of FIGS. 4A to 4D.

In the above, the description has been limited to the preferred embodiments of the present invention, but this is only an example, and the present invention is not limited thereto and can be modified and implemented in various ways, and furthermore, separate technical features are provided based on the disclosed technical idea. It will be obvious that it can be added and implemented.

10: pressure vessel 20: induction pipe
30: pressure valve 31: seat
32: valve body 33: exhaust port
34: disc 35: stem
36: spring 40: bonnet
100: flow control unit 110: branch pipe
120: bypass pipe 121: inlet flow path
123: discharge passage 125: first connection passage
130: support body 131: second connection passage
133: through passage 140: flow control rod
200: pressure amplification unit 300: switching unit
310: operating body 320: operating rod
330: operating spring 340: tube
400: operating unit 410: movable cylinder
420: movable cover

Claims (4)

It is connected to the pressure container 10 through the induction pipe 20, and the disk 34 coupled to the lower end of the stem 35 compresses the spring 36 by the pressure of the high-pressure fluid stored in the pressure container 10. A safety valve 30 that releases the pressure in the pressure container 10 while opening the seat 31 and discharging some of the high-pressure fluid stored in the pressure container 10 to the outside through the exhaust port 33 of the valve body 32. ) As a system to prevent sticking,
A branch pipe 110 communicating with and connected to the induction pipe 20, an inflow passage 121 communicating with the branch pipe 110, and an outlet passage 123 communicating with the inflow passage 121 are formed to form a branch pipe 110 ) The bypass pipe 120 connected to the inflow passage 121 and the discharge passage 123 is located between the inflow passage 121 and the flow control rod 140 for controlling the inflow of fluid through the inflow passage 121 is provided with a flow control unit ( 100);
The injection hole 211 formed in the lower part is connected to the discharge passage 123 of the bypass pipe 120 and the pressure amplification unit 200 in which the fluid supplied through the discharge passage 123 is temporarily stored;
The lower part of the operating body 310 is connected to the discharge hole 213 formed in the upper part of the pressure amplifying unit 200, the lower part faces the discharge hole 213 of the pressure amplifying part 200, and the upper part An operating rod 320 extending to an upper portion inside the operating body 310, an operating spring 330 located inside the operating body 310 and providing a restoring force to the operating rod 320, one end portion of the operating body ( 310) is connected to the upper part and the other part is provided with a tube 340 extending a certain length (300);
The safety valve 30 is formed in an annular groove shape on the inside of the upper side of the bonnet 40, the upper side of which is opened, and the movable cylinder 410 communicating with the other end of the tube 340, the central axis of the safety valve 30 The operating unit 400 coupled to the upper portion of the stem 35 and provided with a movable cover 420 for sealing the upper portion of the lower surface of the movable cylinder 410;
An automatic anti-seize system for safety valves with adjustable operating cycles. According to claim 1,
A first connection passage 125 is formed between the inflow passage 121 and the discharge passage 123 of the drift pipe 120; The support body 130 is inserted through the first connection passage 125, and the second connection communicates with the inflow passage 121 and the discharge passage 123 at the inner surface of the other side in the axial direction of the support body 130. a passage 131 and a through passage 133 are formed; In the axial direction of the support body 130, the flow control rod 140 having the head 141 provided at the other end is inserted through, and the head 141 of the flow control rod 140 is connected to the inflow passage 121. To open and close between the second connection passage 131; It is an automatic anti-seize prevention system for safety valves that can adjust the operating cycle. According to claim 2,
The outer surface of one side of the flow control rod 140 is engaged with the inner surface of one side of the support body 130 by means of a screw thread, and the second connection between the head 141 of the flow control rod 140 and the support body 130 is performed. An automatic anti-seize prevention system for a safety valve capable of adjusting the operation cycle, characterized in that for adjusting the gap between the inlets of the passage 131. According to claim 1,
An annular seating groove 421 corresponding to the movable cylinder 410 is formed on the lower surface of the movable cover 420, and a packing ring 430 is placed in the seating groove 421 to move the movable cylinder 410. And the automatic sticking prevention system of the safety valve capable of adjusting the operating cycle, characterized in that for maintaining the airtightness between the movable cover (420).

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