KR102483082B1 - Safety valve for low pressure having improved backflow prevention function - Google Patents

Abstract

The present invention relates to a safety valve having an improved backflow prevention function, which can reliably and reliably prevent damage to a flow control device caused by a reverse flow of high-temperature and high-pressure combustion gas due to combustion (backfire) in a combustor or the like. According to the present invention, the valve body in which the fluid passage is formed; a slide opening/closing member provided to be slidably movable 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, coupled while securing a movement distance of the slide opening/closing member, and having a fluid passage formed therein; and a sealing means for sealing between the valve body and the valve cap.

Description

Safety valve with improved anti-backflow function {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, to prevent damage applied to a flow control device due to a reverse flow of high-temperature, high-pressure combustion gas due to combustion (backfire) in a combustor, etc. , to safety valves with improved anti-return function.

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

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

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 is used to allow the fluid to flow in only one direction. It does not require any driving force.

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

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

As shown in FIG. 1, the safety valve according to one embodiment of the prior art is provided with a hollow tube-shaped body 1 and a hollow tube-shaped cover 2 coupled to the body 1, and the body 1 Inside, an opening and closing valve 3 for opening and closing the cover 2 is built-in.

As shown, the opening/closing valve 3 has a cylindrical shape, a hemispherical ball 4 protrudes from the upper center, and a plurality of through holes 5 through which fluid can pass are formed at the edges thereof.

An inlet hole (2a) through which fluid is introduced is formed on the top of the cover (2), and an outlet hole (1a) through which fluid is discharged is formed at the lower edge of the main 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 descends and is caught, and the inflowed fluid is shown in FIG. 1(b). As shown in ), it flows in through the gap formed between the water inlet hole 2a and the ball 4, passes through the through hole 5, and is discharged to the pipe 8 connected to the water outlet hole 1a. Conversely, the fluid flowing back from the pipe 8 pushes the opening/closing valve 3 upward, resulting in a state as shown in FIG.

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

2 is a cross-sectional view showing a safety valve according to another conventional embodiment.

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 those of the safety valve shown in FIG. In addition, a plurality of water outlet holes 1a are formed on the lower side of the opening and closing valve 3, and a locking jaw 7 is provided in the center, and a spring 6 is coupled between the opening and closing valve 3 and the locking jaw 7, thereby opening and closing the valve (3) is elastically supported. In addition, the bottom of the main body 1 and the pipe 8 are connected.

As with the safety valve of one embodiment, when the fluid entering the inlet hole 2a with pressure presses the ball 4 of the valve 3, the spring 6 is compressed while the valve 3 descends. As shown in FIG. 2 (b), the introduced fluid is introduced through the gap formed between the water inlet hole 2a and the ball 4 and passed through the through hole 5 and discharged through the water outlet hole 1a. Conversely, if the fluid does not flow from the inlet hole 2a, the spring 3 pushes the opening/closing valve 3 upward, resulting in a state as shown in FIG. .

However, this structure has several problems.

First, in the structure 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 and closing valve descends, so the flow path securing space (e) must be ensured so that the fluid flows smoothly. ) should be secured. This increases the size of the safety valve and hinders miniaturization.

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

Third, in FIG. 2, since the spring supports the opening/closing valve while being caught on the chin, the structure of the check valve becomes complicated because a separate structure capable of supporting the spring, such as the chin, is required in the lower part of the main body.

Fourth, the structure of FIG. 2 has a problem in that it is difficult to precisely control at low pressure. Here, the boundary between high pressure and low pressure is not differentiated hydrodynamically, but the pressure of gas supplied to general households in relation to the combustor is referred to as low pressure, and is in the range of approximately 200 to 300 mmH O (1.96 to 2.95 Kpa). A spring-type valve that opens with this much pressure has low operational stability.

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

Therefore, in order to solve the above-mentioned conventional problems, high-temperature and high-pressure combustion gas flows backward due to combustion (backfire) in a combustor, etc. to reliably and reliably prevent damage to the flow control device. An improved backflow prevention function is provided. Its purpose is to provide a safety valve having

The problems 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 description below.

According to one aspect of the present invention for achieving the above objects and other features of the present invention, the valve body in which the fluid passage is formed; a slide opening/closing member provided to be slidably movable 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, coupled while securing a movement distance of the slide opening/closing member, and having a fluid passage formed therein; and a 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 integrally extending from the large-diameter body portion and having a smaller diameter than the diameter of the large-diameter body portion, and the and a fluid passage formed along a central axis of the large-diameter body and the small-diameter body, wherein the valve cap integrally extends from the cylindrical large-diameter cap body and the large-diameter cap body, wherein the large-diameter cap body It may include a cylindrical small-diameter cap body having a diameter smaller than the diameter of the portion, and a fluid passage formed through a central axis of the large-diameter cap body and the small-diameter cap body.

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

In the present invention, the passage groove may be formed in plurality symmetrically along a line passing through the center point of the valve cap.

In the present invention, the slide opening and closing member is composed of a disk head and a slide rod extending from the disk head, the disk head is formed as a plate-shaped circular block, and the slide rod has a diameter smaller than that of the disk head. It can be formed in the form of a rod having.

In the present invention, the slide rod has a smaller diameter than the diameter of the fluid passage of the valve body, and may be formed with a groove through which 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 of reliably and reliably preventing damage applied to a flow control device due to a reverse flow of high-temperature and high-pressure combustion gas.

Second, since the present invention is controlled by the weight (self-weight) of the slide opening and closing member, the weight of the slide opening and closing member is calculated and manufactured by measuring the pressure of the inflowing gas, that is, it can be precisely controlled by manufacturing variously according to the pressure of the gas It works.

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

The effects 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 description below.

1 is a cross-sectional view showing a safety valve according to an exemplary embodiment in the related art.
2 is a cross-sectional view showing a safety valve according to another conventional embodiment.
3 is a cross-sectional view showing a safety valve having an improved anti-backflow function according to the present invention.
4 is a view showing an embodiment of a slide opening and closing member included in a safety valve having an improved backflow prevention function according to the present invention.
5 is a view showing a slide opening and closing member included in a safety valve having an improved backflow prevention function according to the present invention, (A) is a view viewed from the AA side of FIG. 3, (B) is on line BB of FIG. It is a cross-section along
6 is a view showing a lower surface of a valve cap included in a safety valve having an improved backflow prevention function according to the present invention.
Figure 7 is a view showing the operation of the safety valve having an improved backflow prevention function according to the present invention, (A) shows the open state of the slide opening and closing member, (B) is a view showing the closed state of the slide opening and 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 may make various changes and may 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 changes, equivalents or substitutes included in the spirit and scope of the present invention.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

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

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description 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 and closing member included in a safety valve having an improved backflow prevention function according to the present invention, 5 is a view showing a slide opening and closing member included in a 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 view along line B-B in FIG. 6 is a view showing the bottom surface of the valve cap included in the safety valve having an improved backflow prevention function according to the present invention, and FIG. 7 shows the operation of the safety valve having an improved backflow prevention function according to the present invention. As a drawing, (A) shows an open state of the slide opening/closing member, and (B) is a drawing showing a closed state of the slide opening/closing member.

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

Specifically, the safety valve having an improved backflow prevention function according to the present invention, as shown in FIGS. 100); a slide opening/closing member 200 provided to be slidable in the fluid passage 101 of the valve body 100 and to open and close an upper end of the fluid passage 101 by a sliding movement; It is coupled to the upper part of the valve body 100, and is coupled to the valve body 100 at the lower end with a space to secure the movement distance of the slide opening and closing member 200 and to provide a gas flow space, and the fluid passage in the center. 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 the gap between the valve body 100 and the valve cap 300 .

The valve body 100 is provided with a slide opening/closing member 200 to be able to slide 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/closing member 200 , The valve cap 300 is configured to be coupled to the upper side.

Specifically, the valve body 100 includes a cylindrical (or cylindrical) large-diameter body portion 110 having a relatively larger diameter than the small-diameter body portion 120 described below, and the large-diameter body portion 110 A cylindrical (or cylindrical) small-diameter body portion 120 extending in the longitudinal direction (gas flow direction) from the center, and along the central axis of the large-diameter body portion 110 and the small-diameter body portion 120 and a fluid passage 101 formed therethrough.

A gas connector or an external hose connected to the gas supply side (eg, 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 the side where gas is introduced (eg, combustor side). For example, a gas supply) is connected.

Subsequently, the slide opening/closing member 200 is provided to be slidably movable 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 (ie, is pushed up) by the incoming gas pressure when the incoming gas pressure (incoming gas pressure) is above a certain level, and the fluid passage 101 of the valve sea 100 ) is opened so that the gas flows 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 to the combustor due to backfire), the inlet gas pressure is lowered. When the gas pressure in the reverse direction is high, it is configured to move downward (ie, descend) by the reverse gas pressure and close 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 the 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 as a rod 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 and made.

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

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

The slide opening and closing member 200 is preferably made of brass, 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 calculating the weight of the slide opening and closing member by measuring the pressure of the gas used in the device or facility to which the safety valve will be applied. 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 It is structured to have space and be combined.

Specifically, the valve cap 300 is a cylindrical (or cylindrical) large-diameter cap formed with a relatively larger diameter than the small-diameter cap body 320, similar to the structure of the valve body 100 described above. A body portion 310, a cylindrical (or cylindrical) small-diameter cap body portion 320 extending in a longitudinal direction (gas flow direction) from the center of the large-diameter cap body portion 310, and the large-diameter cap body A fluid passage 301 formed by penetrating the portion 310 and the small-diameter cap body portion 320 along the central axis is included.

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

Here, it is preferable that the passage grooves are formed in plurality symmetrically along a line passing through the center 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 in that 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.

In addition, according to the present invention, since it is controlled by the weight (self-weight) of the slide opening and closing member, the weight of the slide opening and closing member is calculated and manufactured by measuring the pressure of the inflowing gas, that is, it can be precisely controlled by manufacturing variously according to the pressure of the gas. And there is an advantage in implementing a safety valve that operates precisely in an environment with a low-pressure gas flow.

The embodiments described in this specification and the accompanying drawings merely illustrate some of the technical ideas included in the present invention by way of example. Therefore, since the embodiments disclosed in this specification are not intended to limit the technical idea of the present invention but to explain it, it is obvious that the scope of the technical idea of the present invention is not limited by these embodiments. All modified examples and specific examples that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

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

Claims (5)

a valve body having a fluid passage;
a slide opening/closing member provided to be slidably movable 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, coupled while securing a movement distance of the slide opening/closing member, and having a fluid passage formed therein; and
A sealing means for sealing between the valve body and the valve cap,
The valve body includes a cylindrical large-diameter body portion, a cylindrical small-diameter body portion integrally extending from the large-diameter body portion and having a smaller diameter than the diameter of the large-diameter body portion, and the large-diameter body portion and the small-diameter body portion. Including a fluid passage formed through the central axis of the body,
The valve cap includes a cylindrical large-diameter cap body portion, a cylindrical small-diameter cap body portion integrally extending from the large-diameter cap body portion and having a smaller diameter than the diameter of the large-diameter cap body portion, and the large-diameter cap body portion. A fluid passage formed through the cap body and the central axis of the small-diameter cap body,
One or more passage grooves through which gas passes are formed on the lower surface of the small-diameter cap body, and a plurality of them are formed symmetrically along a line passing through the center point,
The slide opening and closing member is composed of 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 smaller diameter than the diameter of the disk head,
The slide rod has a diameter smaller than the diameter of the fluid passage of the valve body, and when viewed from the top, a plurality of gas guide grooves rounded inward are formed at intervals on the outer surface.
safety valve.
delete delete delete According to claim 1,
Characterized in that the sealing means is composed of an O-ring provided between the inner surface of the valve body and the outer surface of the valve cap.
safety valve.

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