KR20220110368A - Safety valve for low pressure having improved backflow prevention function - Google Patents

Abstract

The present invention relates to a safety valve with an improved backflow prevention function, which can reliably and effectively prevent damage to a flow control device caused by the backflow of high-temperature and high-pressure combustion gases, resulting from combustion (flashback) in a combustor or the like. According to the present invention, the safety valve comprises: a valve body in which a fluid passage is formed; a slide opening/closing member provided to slidably move in the fluid passage of the valve body and configured to open and close an upper end of the fluid passage by sliding movement; a valve cap coupled to an upper portion of the valve body while ensuring a movement distance of the slide opening/closing member, and having a fluid passage formed therein; and a sealing mean provided to seal a space between the valve body and the valve cap.

Description

SAFETY VALVE FOR LOW PRESSURE HAVING IMPROVED BACKFLOW PREVENTION FUNCTION

The present invention relates to a safety valve applied to a combustor, etc., and more particularly, it is possible to reliably and reliably prevent damage to the flow control device due to a reverse flow of high-temperature and high-pressure combustion gas due to combustion (backfire) in a combustor, etc. , to a safety valve having an improved anti-return function.

In general, a safety valve is a valve that can be opened and closed by itself according to the fluid flow state of a piping system, and is a mechanical part that opens and closes the fluid flow or regulates the flow rate while controlling the flow rate, flow speed, pressure, etc. of a fluid flowing through a pipe.

There are several types of these safety valves depending on the purpose of use, but the most widely used is a stop valve, and other known slew valves, check valves, pressure reducing valves, cocks and control valves are known.

Among these valves, the safety valve (or check valve) is called a non-return valve and is installed in the middle of the length of the pipe and used to allow the fluid to flow in only one direction. It does not require any driving force because it operates by

Here, the flow direction in which the fluid flows is called "forward" and the opposite flow is called "reverse".

1 is a cross-sectional view showing a safety valve according to an embodiment of the related art.

As shown in FIG. 1, the safety valve according to an embodiment of the related art includes a hollow tube-shaped body 1 and a hollow tube-shaped cover 2 coupled to the main body 1, and the main body (1) An opening/closing valve 3 for opening and closing the cover 2 is built inside.

The opening/closing side 3 has a cylindrical shape as shown, a hemispherical ball 4 protrudes from the center of the upper portion, and a plurality of through-holes 5 through which a fluid can pass are formed at the edge thereof.

An inlet hole 2a through which the fluid is introduced is formed on the upper part of the cover 2, an outlet hole 1a through which the fluid is discharged is formed on the lower edge of the body 1, and an external pipe 8 is connected to the outlet hole 1a. do.

Because of this structure, when the fluid entering the inlet hole 2a with pressure presses the ball 4 of the opening/closing valve 3, the opening/closing valve 3 is caught while descending, and the introduced fluid is shown in Fig. 1(b). ), it is introduced through the gap formed between the inlet hole 2a and the ball 4, passes through the through hole 5, and is discharged to the pipe 8 connected to the outlet hole 1a. Conversely, the fluid flowing backward from the pipe 8 pushes the opening/closing valve 3 upwards, which results in a state as shown in FIG.

In particular, the main body 1 is provided with a flow path securing space e, so that the passage 5 is not blocked by the end of the pipe 8 in a state in which the opening/closing valve 3 is lowered, so that the fluid smoothly escapes.

2 is a cross-sectional view showing a safety valve according to another embodiment of the related art.

In the safety valve of another embodiment, as shown in FIG. 2, the main body 1, the cover 2, the opening/closing valve 3, the ball 4, and the through hole 5 are the same as the safety valve shown in FIG. In addition, a plurality of water outlet holes 1a are formed on the lower side of the opening/closing valve 3, and a locking jaw 7 is provided in the center. (3) is elastically supported. In addition, the lower end of the body 1 and the pipe 8 are connected.

When the fluid that has entered the inlet hole 2a with the same pressure as the safety valve of one embodiment presses the ball 4 of the opening/closing valve 3, the spring 6 is compressed while the opening/closing valve 3 is lowered. , the introduced fluid flows in through the gap formed between the inlet hole 2a and the ball 4, as shown in FIG. 2(b), passes through the through hole 5, and is discharged to the outlet hole 1a. Conversely, if the fluid does not flow from the receiving hole (2a), the spring (3) pushes the opening/closing valve (3) upward. .

However, this structure has several problems.

First, in the structure as shown in Fig. 1, if the flow path securing space (e) is not formed on both sides of the ball, the end of the pipe blocks the through hole when the opening/closing side descends, so the flow path securing space (e) must be ) should be secured. This increases the size of the safety valve and hinders downsizing.

Second, in the structure shown in FIG. 2, since the spring is coupled to the lower part of the opening and closing side, a space for installation including both the opening and closing side and the height of the spring is required, and consequently the size of the body increases, which also hinders the miniaturization of the check valve.

Third, since the spring in FIG. 2 supports the opening and closing valve in a state caught on the locking jaw, a separate structure capable of supporting the spring, such as the locking jaw, is required at the lower part of the main body, thereby complicating the structure of the check valve.

Fourth, the structure of FIG. 2 has a problem in that it is difficult to precisely control it at a low pressure or the like. Here, hydrodynamically, the boundary between high pressure and low pressure is not divided, but in relation to the combustor, the pressure of the gas supplied to the general household is called low pressure, and is approximately in the range of 200 to 300 mmH2O (1.96 to 2.95Kpa). A spring-type valve that is opened by this amount of pressure has low operational stability.

Korean Patent Publication No. 10-2010-0008405 (published on Jan. 26, 2010) Korean Patent Publication No. 10-2013-0140447 (published on December 24, 2013) Republic of Korea Public Utility Model Publication 20-2019-0000664 (published on March 14, 2019)

Therefore, in order to solve the above-mentioned problems of the prior art, an improved backflow prevention function that can reliably and reliably prevent damage to the flow control device due to a backflow of high-temperature and high-pressure combustion gas due to combustion (backfire) in a combustor, etc. An object of the present invention is to provide a safety valve having

The problems to be solved of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to one aspect of the present invention for achieving the above objects and other features of the present invention, a valve body in which a fluid passage is formed; a slide opening/closing member that is slidably provided in the fluid passage of the valve body and configured to open and close an upper end of the fluid passage by sliding; a valve cap coupled to an upper portion of the valve body while securing a moving distance of the slide opening/closing member, the valve cap having a fluid passage; and sealing means for sealing between the valve body and the valve cap.

In the present invention, the valve body includes a cylindrical large-diameter body portion, a cylindrical small-diameter body portion extending integrally with the large-diameter body portion, and having a diameter smaller than the diameter of the large-diameter body portion, and the a fluid passage formed through the large-diameter body portion and the small-diameter body portion along a central axis, wherein the valve cap is integrally formed with a cylindrical large-diameter cap body portion and the large-diameter cap body portion, and the large-diameter cap body It may include a small-diameter cylindrical cap body portion having a diameter smaller than the negative diameter, and a fluid passage formed through a central axis of the large-diameter cap body portion and the small-diameter cap body portion.

In the present invention, one or more flow path grooves may be formed on the lower end surface of the valve cap.

In the present invention, the flow path grooves may be symmetrically formed in a plurality of lines passing through the center point of the valve cap.

In the present invention, the slide opening/closing member includes a disk head and a slide rod extending from the disk head, the disk head being formed as a plate-shaped circular block, and the slide rod having a smaller diameter than the disk head. It may be formed in the form of a rod having

In the present invention, the slide rod has a diameter smaller than the diameter of the fluid passage of the valve body, and may be formed with a groove through which the gas is guided.

According to the safety valve having an improved backflow prevention function according to the present invention, the following effects are provided.

First, the present invention has an effect that can reliably and reliably prevent damage to the flow control device due to the reverse flow of high-temperature and high-pressure combustion gas.

Second, since the present invention is adjusted as the weight (self-weight) of the slide opening and closing member, it is possible to precisely control the It works.

Third, the present invention has an effect that can implement a safety valve that operates precisely in an environment having a low pressure gas flow.

Effects of the present invention are not limited to those mentioned above, and other solutions not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a cross-sectional view showing a safety valve according to an embodiment of the related art.
2 is a cross-sectional view showing a safety valve according to another embodiment of the related art.
3 is a cross-sectional view illustrating a safety valve having an improved backflow prevention function according to the present invention.
4 is a view illustrating an embodiment of a slide opening/closing member included in the safety valve having an improved backflow prevention function according to the present invention.
5 is a view showing a slide opening/closing member included in the safety valve having an improved backflow prevention function according to the present invention, (A) is a view viewed from the AA side of FIG. is a cross-sectional view.
6 is a view showing a lower end surface of a valve cap included in the safety valve having an improved backflow prevention function according to the present invention.
7 is a view showing the operation of the safety valve having an improved backflow prevention function according to the present invention. (A) shows an open state of the slide opening/closing member, and (B) is a view showing the closed state of the slide opening/closing member.

Additional objects, features and advantages of the present invention may be more clearly understood from the following detailed description and accompanying drawings.

Prior to the detailed description of the present invention, the present invention can make various changes and can have various embodiments, and the examples described below and shown in the drawings are not intended to limit the present invention to specific embodiments. No, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms such as "...unit", "...unit", "...module", etc. described in the specification mean a unit that processes at least one function or operation, which includes hardware or software or hardware and It can be implemented by a combination of software.

In addition, in the description with reference to the accompanying drawings, the same components are assigned the same reference numerals regardless of the reference numerals, and the overlapping description thereof will be omitted. In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, a safety valve having an improved backflow prevention function according to a preferred embodiment of the present invention will be described with reference to FIGS. 3 to 6 .

3 is a cross-sectional view showing a safety valve having an improved backflow prevention function according to the present invention, and FIG. 4 is a view showing an embodiment of a slide opening/closing member included in the safety valve having an improved backflow prevention function according to the present invention; 5 is a view showing a slide opening/closing member included in the safety valve having an improved backflow prevention function according to the present invention, (A) is a view viewed from the A-A side of FIG. 3, (B) is a line B-B of FIG. 6 is a view showing a lower end surface of a valve cap included in the safety valve having an improved backflow prevention function according to the present invention, and FIG. 7 is an operation of the safety valve having an improved backflow prevention function according to the present invention. In the figure shown, (A) shows the open state of the slide opening/closing member, and (B) is a figure which shows the closed state of the slide opening/closing member.

A safety valve having an improved backflow prevention function according to the present invention, as shown in FIGS. 3 to 7, largely includes a valve body 100; slide opening and closing member 200; valve cap 300; and sealing means 400 .

Specifically, the safety valve having an improved backflow prevention function according to the present invention, as shown in FIGS. 3 to 7, is a valve body ( 100); a slide opening/closing member 200 that is slidably provided in the fluid passage 101 of the valve body 100 and is provided to open and close the upper end of the fluid passage 101 by sliding movement; Doedoe coupled to the upper portion of the valve body 100, to secure a moving distance of the slide opening and closing member 200 and to provide a gas flow space at the lower end is coupled with the valve body 100 with a space, and a fluid passage in the center a valve cap 300 on which 301 is formed; and a sealing means 400 provided between the valve body 100 and the valve cap 300 to seal between the valve body 100 and the valve cap 300 .

The valve body 100 is provided with a slide opening and closing member 200 slidably in the fluid passage 101 formed on the lower side, and the upper end of the fluid passage 101 is opened and closed by the movement of the slide opening and closing member 200, , the valve cap 300 is configured to be coupled to the upper side.

Specifically, the valve body 100 includes a large-diameter body portion 110 of a cylindrical shape (or a cylinder shape) formed to have a relatively larger diameter than the smaller-diameter body portion 120 below, and the large-diameter body portion 110 . A cylindrical (or cylindrical) small-diameter body part 120 extending in the longitudinal direction (in the gas flow direction) from the center of and a fluid passage 101 formed therethrough.

A gas connector or an external hose connected to a side to which gas is supplied (eg, a combustor side) is connected to the upper end of the large-diameter body part 110 , and the small-diameter body part 120 is connected to a gas inlet side (eg, a side of the combustor) gas supply) is connected.

Subsequently, the slide opening/closing member 200 is slidably provided in the fluid passage 101 of the valve body 100 and is provided to open and close the upper end of the fluid passage 101 by sliding movement.

That is, the slide opening/closing member 200 moves upward (that is, pushed up) by the incoming gas pressure when the pressure of the incoming gas (incoming gas pressure) is equal to or greater than a certain level, and the fluid passage 101 of the valve sea 100 ) to allow gas to flow through the fluid passage 301 of the valve cap 300, and in an abnormal state (for example, when high-temperature and high-pressure gas flows back due to backfire with a combustor), When the gas pressure in the reverse direction is large, it moves to the lower side (ie, descends) by the reverse gas pressure and closes the upper end of the fluid passage 101 of the valve body 100 .

Specifically, the slide opening/closing member 200 includes a disk head 210 and a slide rod 220 extending from a central portion of a lower surface of the disk head 210 .

The disk head 210 may be formed as a plate-shaped circular block, and the slide rod 220 may be formed in a rod shape having a diameter smaller than that of the disk head 210 .

The disk head 210 has a size capable of closing (covering) the upper end of the fluid passage 101 of the valve body 100 , and the slide rod 220 is the fluid passage 101 of the valve body 100 . It is formed with a diameter equal to or slightly smaller than the diameter of

In addition, as shown in FIGS. 4 and 5 , the slide rod 220 is formed in a rod shape having a diameter smaller than that of the disk head 210 , and one or more gas guide grooves 221 are formed on the outer surface in the longitudinal direction. It can be formed by

The gas guide grooves 221 are formed in a plurality at intervals on the outer surface of the slide rod 220, and are preferably formed to be round.

The gas guide groove 221 forms a guide passage through which gas flows when the slide opening and closing member 200 is opened.

The slide opening and closing member 200 is preferably made of a brass material, but is not limited thereto.

The weight of the slide opening/closing member 200 configured as described above is determined by the pressure of the gas, and the safety valve of the present invention is applied to a structure specialized for a specific pressure. In other words, it is manufactured by measuring the pressure of the gas used in the device or facility to which the safety valve is applied and calculating the weight of the slide opening/closing member. so that it can be manipulated.

Next, the valve cap 300 is coupled to the upper portion of the valve body 100, and the valve body 100 and the valve body 100 and It has space and is configured to be combined.

Specifically, the valve cap 300 is a large-diameter cap of a cylindrical shape (or a cylinder shape) formed to have a relatively larger diameter than the smaller-diameter cap body 320 , similar to the structure of the above-described valve body 100 . The body part 310, the small diameter cap body part 320 of the cylindrical shape (or cylinder shape) extending in the longitudinal direction (gas flow direction) from the center of the large diameter cap body part 310, and the large diameter cap body It includes a fluid passage 301 formed by penetrating the portion 310 and the small-diameter cap body portion 320 on the central axis.

As shown in FIG. 6 , one or more flow path grooves are formed on the lower end surface of the small-diameter cap body part 320 .

Here, it is preferable that a plurality of the channel grooves are symmetrically formed on a line passing through the central point.

Subsequently, the sealing means 400 is provided between the valve body 100 and the valve cap 300 to seal between the valve body 100 and the valve cap 300 , and the valve body 100 . It may be composed of an O-ring provided between the inner surface of the valve cap 300 and the outer surface of the valve cap 300 .

According to the safety valve having an improved backflow prevention function according to the present invention as described above, there is an advantage that can reliably and reliably prevent damage to the flow control device due to the reverse flow of the high-temperature and high-pressure combustion gas.

In addition, according to the present invention, since it is adjusted as the weight (self-weight) of the slide opening/closing member, it is possible to precisely control by measuring the pressure of the inflowing gas and calculating the weight of the slide opening/closing member, that is, manufacturing it in various ways according to the pressure of the gas. There is an advantage in that it is possible to implement a safety valve that operates precisely in an environment having a low pressure gas flow.

The embodiments described in this specification and the accompanying drawings are merely illustrative of some of the technical ideas included in the present invention. Therefore, since the embodiments disclosed in the present specification are for explanation rather than limiting the technical spirit of the present invention, it is obvious that the scope of the technical spirit of the present invention is not limited by these embodiments. Modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical spirit included in the specification and drawings of the present invention should be interpreted as being included in the scope of the present invention.

100: valve body
101, 301: fluid passage
110: large diameter body part
120: small diameter body part
200: slide opening and closing member
210: disk head
220: slide load
221: gas guide groove
300: valve cap
310: large diameter cap body portion
320: small diameter cap body portion
321: Eurohome
400: sealing means

Claims (5)

a valve body having a fluid passage formed therein;
a slide opening/closing member that is slidably provided in the fluid passage of the valve body and configured to open and close an upper end of the fluid passage by sliding;
a valve cap coupled to an upper portion of the valve body while securing a moving distance of the slide opening/closing member, the valve cap having a fluid passage; and
Sealing means for sealing between the valve body and the valve cap; characterized in that it comprises
safety valve.
According to claim 1,
The valve body includes a cylindrical large-diameter body portion, a small-diameter cylindrical body portion extending integrally with the large-diameter body portion and having a diameter smaller than a diameter of the large-diameter body portion, and the large-diameter body portion and the small diameter It includes a fluid passage formed through the central axis of the body portion,
The valve cap may include a cylindrical large-diameter cap body portion, a cylindrical small-diameter cap body portion extending integrally with the large-diameter cap body portion, and having a diameter smaller than a diameter of the large-diameter cap body portion, and the large diameter It characterized in that it comprises a fluid passage formed through the cap body portion and the central axis of the small-diameter cap body portion.
safety valve.
3. The method of claim 1 or 2,
One or more flow path grooves through which gas passes are formed in the valve cap
safety valve.
According to claim 1,
The slide opening/closing member includes a disk head and a slide rod extending from the disk head,
The disk head is formed of a plate-shaped circular block,
The slide rod is formed in the form of a rod having a diameter smaller than the diameter of the disk head.
safety valve.
5. The method of claim 4,
The slide rod has a diameter smaller than the diameter of the fluid passage of the valve body, characterized in that it is formed with a gas guide groove.
safety valve.

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