KR20240176206A - Pressure relief device for high pressure container - Google Patents

Abstract

A pressure relief device for a high-pressure vessel is provided, which enables the operation of discharging gas from a high-pressure vessel smoothly and quickly by rapidly melting and discharging the gas at a relatively low temperature when a fire occurs.
To this end, a pressure relief device for a high-pressure vessel according to the present invention comprises: a first body having a gas inlet channel and a gas outlet channel formed therein and a first internal space communicated with the gas inlet channel and the gas outlet channel; a second body coupled to the first body and having a second internal space communicated with the first internal space; a piston valve installed in the second internal space so as to be linearly movable, one end of which protrudes through one end of the second body into the first internal space to close the gas inlet channel and the gas outlet channel and open the gas inlet channel and the gas outlet channel when moving linearly; and a fusible alloy installed in the second internal space to support the piston valve so as not to be linearly movable and to enable linear movement of the piston valve by melting at a predetermined temperature, wherein the other end of the piston valve penetrates the fusible alloy in the direction of linear movement.

Description

PRESSURE RELIEF DEVICE FOR HIGH PRESSURE CONTAINER

The present invention relates to a pressure relief device for a high-pressure vessel, and more particularly, to a pressure relief device for a high-pressure vessel having a fusible alloy that melts at a predetermined temperature.

In general, hydrogen fuel cell vehicles use electric energy generated by the chemical reaction of oxygen and hydrogen in a stack as a power source. The hydrogen fuel cell vehicle can continuously generate power regardless of the capacity of the battery by supplying fuel and air from outside, so it has the advantage of high efficiency and almost no emission of pollutants, and thus, the technology development of the hydrogen fuel cell vehicle has been active recently.

The above hydrogen fuel cell vehicle is equipped with one or more hydrogen tanks (= fuel tanks, gas tanks, or high-pressure containers) in which high-pressure hydrogen gas is charged. Since the fuel tank storing gas such as the above hydrogen tank has high-pressure gas pressure inside, there is a risk of explosion due to the gas pressure inside if the temperature of the fuel tank rises in the event of a vehicle fire or vehicle abnormality.

As a technology for preventing explosion of the above fuel tank, a ‘pressure relief device for a high-pressure container’ is disclosed in Korean Patent Publication No. 10-2515443 (2023.03.29.) (hereinafter referred to as ‘prior art’).

The above-mentioned conventional technology comprises a first body part coupled to a valve body mounted on a high-pressure vessel and having a gas passage formed through which gas from the high-pressure vessel flows in and a space part formed in communication with the gas passage part, a second body part mounted on the space part of the first body part and having a gas discharge port formed to discharge gas flowing into the space part to the outside and a chamber formed in communication with the space part, a piston member mounted in the chamber so as to be able to move linearly and open and close the gas passage part, a spring disposed between the space part and the piston member to provide elastic force in a direction in which the piston member is retracted, and a fusible alloy mounted in a chamber located at the rear of the piston member and melted when the ambient temperature is higher than a set temperature, and a gas discharge port of the second body part is formed in multiple numbers at regular intervals in the circumferential direction of the second body part, one side of which is communicated with the space part and the other side is formed on the rear side of the second body part, and when the fusible alloy is melted and discharged to the outside of the chamber, the piston member is retracted and the gas passage is opened so that the high-pressure gas from the high-pressure vessel is discharged. It is discharged to the outside through a gas passage.

However, the above-mentioned conventional technology has a problem in that since the size of the fusible alloy is large and a relatively high temperature is required for the fusible alloy to be completely melted when a fire occurs, when the temperature due to the fire is relatively low, the fusible alloy partially melts and then hardens again, resulting in a malfunction in which gas cannot be discharged to the outside.

In addition, the above-described prior art has a molten discharge port formed to discharge the molten fusible alloy due to the occurrence of a fire, and since the direction of the molten discharge port is formed orthogonal to the linear movement direction of the piston member, there is a problem in that a lot of force is required for the piston member to push the molten fusible alloy, and the molten fusible alloy cannot be discharged quickly.

Republic of Korea Patent Publication No. 10-2515443 (2023.03.29.)

The problem to be solved by the present invention is to provide a pressure relief device for a high-pressure vessel, which enables the operation of discharging gas from the high-pressure vessel smoothly and quickly by rapidly melting and discharging the fusible alloy at a relatively low temperature when a fire occurs.

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

In order to achieve the above object, a pressure relief device for a high-pressure vessel according to the present invention comprises a first body, a second body, a piston valve, and a fusible alloy. A gas inlet passage and a gas outlet passage are formed in the first body. A first internal space is formed in the first body, which is communicated with the gas inlet passage and the gas outlet passage. The second body is coupled to the first body. A second internal space is formed in the second body, which is communicated with the first internal space. The piston valve is installed in the second internal space so as to be able to move linearly. One end of the piston valve protrudes into the first internal space through one end of the second body to close a space between the gas inlet passage and the gas outlet passage. The piston valve opens a space between the gas inlet passage and the gas outlet passage when moving linearly. The fusible alloy is installed in the second internal space. The fusible alloy supports the piston valve so that it cannot move linearly. The above-mentioned fusible alloy is melted at a predetermined temperature to enable the piston valve to move in a straight line. The other end of the piston valve penetrates the above-mentioned fusible alloy in the direction of linear movement.

A through hole can be formed in the above available alloy. The other end of the piston valve can pass through the through hole.

The piston valve may be composed of a piston portion, a valve shaft portion, and a pressurizing portion. The valve shaft portion may be formed to protrude at the center of one surface of the piston portion to form one end of the piston valve. An end of the valve shaft portion may be inserted into the gas inlet passage to close a space between the gas inlet passage and the gas outlet passage. An end of the valve shaft portion may be drawn out of the gas inlet passage when the piston valve moves linearly to open a space between the gas inlet passage and the gas outlet passage. The pressurizing portion may be formed to protrude at the center of the other surface of the piston portion to form the other end of the piston valve penetrating the fusible alloy. The fusible alloy may support the other surface of the piston portion.

The above valve shaft portion can penetrate a spring. The spring can pressurize one surface of the piston portion to provide elasticity to the piston valve.

A plug insertion groove may be formed at the other end of the second body. A center hole and a molten material discharge hole may be formed on an inner surface of the plug insertion groove. The center hole may be communicated with the second internal space. The pressurized shaft may be arranged in the center hole so as to be linearly movable. The molten material discharge hole may be communicated with the second internal space and formed in a linear movement direction of the piston valve. The molten material discharge hole may be used to melt and discharge the fusible alloy. The plug insertion groove may be closed by a plug. The plug may be pressurized by the pressurized shaft when the piston valve linearly moves to open the plug insertion groove.

A first outer peripheral groove may be formed on the outer surface of the piston portion. A first seal may be inserted and installed in the first outer peripheral groove. The first seal may be in close contact with the inner surface of the second internal space.

A second outer peripheral groove may be formed on the outer peripheral surface of the end portion of the valve shaft. At least one second seal may be inserted and installed in the second outer peripheral groove. The at least one second seal may be in close contact with the inner peripheral surface of the gas inlet passage.

One end of the second body may be inserted and installed into the first internal space. A third outer peripheral groove may be formed on the outer surface of one end of the second body. A third seal may be inserted and installed in the third outer peripheral groove. The third seal may be in close contact with the inner surface of the first internal space.

Specific details of other embodiments are included in the detailed description and drawings.

In the pressure relief device for a high-pressure vessel according to the present invention, since the other end of the piston valve penetrates the fusible alloy in a linear movement direction, the thickness of the fusible alloy is formed thin, so that when a fire occurs, the fusible alloy melts at a relatively low temperature and is easily discharged, thereby having the effect of facilitating the operation of discharging gas from the high-pressure vessel.

In addition, since the pressure relief device for a high-pressure vessel according to the present invention has a molten material discharge hole for discharging the molten fusible alloy formed in the linear movement direction of the piston valve, the molten fusible alloy is quickly discharged through the molten material discharge hole, so there is also an effect of being able to quickly discharge gas from the high-pressure vessel in the event of a fire.

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

Figure 1 is a perspective view showing a pressure relief device for a high-pressure vessel according to an embodiment of the present invention.
Figure 2 is a bottom perspective view of Figure 1;
Figure 3 is an exploded perspective view showing a pressure relief device for a high-pressure vessel according to an embodiment of the present invention.
Figure 4 is a cross-sectional view showing a pressure relief device for a high-pressure vessel according to an embodiment of the present invention.
Fig. 5 is a drawing showing the piston valve illustrated in Fig. 3;
Figure 6 is an exploded perspective view of Figure 5.
Fig. 7 is a perspective view showing the available alloy shown in Fig. 3;
Fig. 8 is a drawing showing the first body illustrated in Fig. 4;
Fig. 9 is a drawing showing the second body illustrated in Fig. 3;
Fig. 10 is an exploded perspective view of Fig. 9.
Fig. 11 is a bottom perspective view of Fig. 9.
Figure 12 is a drawing showing the initial stage of the operation in which the available alloy is melted and discharged when a fire occurs in the same state as Figure 4.
Figure 13 is a drawing showing a state in which the available alloy is melted and completely discharged when a fire occurs in the same state as Figure 4.

Hereinafter, a pressure relief device for a high-pressure vessel according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a pressure relief device for a high-pressure vessel according to an embodiment of the present invention, FIG. 2 is a bottom perspective view of FIG. 1, FIG. 3 is an exploded perspective view showing a pressure relief device for a high-pressure vessel according to an embodiment of the present invention, and FIG. 4 is a longitudinal cross-sectional view showing a pressure relief device for a high-pressure vessel according to an embodiment of the present invention.

In the following description, terms related to direction follow the directions shown in FIGS. 1 to 4, with the upper side meaning one end, the lower side meaning the other end, the upper side meaning one side, the lower side meaning the other side, the upper side meaning one end, the lower side meaning the other end, the upper side meaning one side, and the lower side meaning the other side.

Referring to FIGS. 1 to 4, a pressure relief device (1) for a high-pressure container according to an embodiment of the present invention can be connected to a high-pressure container (not shown). Here, the high-pressure container can be used as a fuel tank for an automobile. That is, the inside of the high-pressure container can be filled with a high-pressure gas such as hydrogen or LPG. The pressure relief device (1) for a high-pressure container can prevent an explosion of the high-pressure container by discharging high-pressure gas flowing into the high-pressure container to the outside when a fire occurs.

Specifically, a pressure relief device (1) for a high-pressure vessel may include a first body (100), a second body (200), a piston valve (300), a fusible alloy (400), and a spring (500).

The first body (100) and the second body (200) can be coupled to each other. The upper part of the second body (100) is inserted into the interior of the first body (100) through the lower opening of the first body (100) and coupled to the lower part of the first body (100), so that the first body (100) and the second body (200) can be coupled to each other. The first body (100) and the second body (200) can be coupled to each other to form the outer shape of a pressure relief device (1) for a high-pressure vessel.

A gas inlet passage (101) and a gas outlet passage (102) may be formed in the first body (100). The gas inlet passage (101) and the gas outlet passage (102) may be arranged orthogonally to each other. The gas inlet passage (101) may be formed in the center of the upper surface of the first body (100) and may extend downward, and the gas outlet passage (102) may be formed on the outer surface of the first body (100) and may extend horizontally.

However, the gas inlet channel (101) and the gas outlet channel (102) do not necessarily have to be arranged orthogonally to each other. For example, the gas outlet channel (102) may be arranged such that the portion communicating with the gas inlet channel (101) is orthogonal to the gas inlet channel (101), and the remaining portion may extend in the same direction as the gas inlet channel (101) and be formed to the lower end of the first body (100).

A first internal space (103) may be formed in the first body (100) to be connected to a gas inlet passage (101) and a gas outlet passage (102). The gas inlet passage (101) and the gas outlet passage (102) may be connected to each other by the first internal space (103) of the first body (100). The first internal space (103) may extend downward from the lower end of the gas inlet passage (101) to the lower end of the first body (100). The first internal space (103) may be formed at the center of the lower surface of the first body (100) and may extend upward. The gas inlet passage (101) and the first internal space (103) may be formed in the longitudinal direction of the first body (110). The first internal space (103) may be formed to have a larger diameter than the gas inlet passage (101).

The upper part of the first body (100) can be connected to the high-pressure vessel. The upper part of the first body (100) can be connected to the high-pressure vessel by being inserted into the high-pressure vessel through a hole formed in the high-pressure vessel. Alternatively, the upper part of the first body (100) can be connected to the high-pressure vessel through a connecting member that is arranged outside the high-pressure vessel and connects the internal space of the high-pressure vessel and the gas inlet passage (101).

When the upper part of the first body (100) is connected to the high-pressure vessel, the high-pressure gas inside the high-pressure vessel can be introduced into the first internal space (103) of the first body (100) through the gas inlet passage (101), and the gas introduced into the first internal space (103) of the first body (100) can be discharged to the outside of the first body (100) through the gas outlet passage (102) when the space between the gas inlet passage (101) and the gas outlet passage (102) is open.

The second body (200) can be coupled to the first body (100). The upper part of the second body (200) can be inserted and installed into the first internal space (103). The upper part of the second body (200) can be inserted and installed into the first internal space (103) through an opening of the first internal space (103) formed at the lower part of the first body (100).

A second internal space (203) may be formed in the second body (200) that is connected to the first internal space (103) formed in the first body (100). The second internal space (203) may be formed in the center of the upper surface of the second body (200) and may extend downward. The second internal space (203) may extend in the longitudinal direction of the second body (200).

The gas inlet passage (101) and the first internal space (103) formed in the first body (100) and the second internal space (203) formed in the second body (100) can extend in the same direction, i.e., in the vertical direction, and can extend in the longitudinal direction of the piston valve (300).

The piston valve (300) can be installed so as to be linearly movable in the second internal space (203). The piston valve (300) can be installed so as to be linearly movable in the longitudinal direction. The gas inlet passage (101), the first internal space (103), and the second internal space (203) can be extended in the linear movement direction of the piston valve (300).

The upper part of the piston valve (300) is positioned to protrude through the upper part of the second body (200) into the first internal space (103) of the first body (100) so as to close the space between the gas inlet passage (101) and the gas outlet passage (102). The upper part of the piston valve (300) is inserted into the gas inlet passage (101) so as to close the space between the gas inlet passage (101) and the gas outlet passage (102).

In addition, when the available alloy (400) is melted by the temperature at the time of fire, the piston valve (300) can be moved linearly downward by the pressure of the gas flowing into the gas inlet passage (101) from the high-pressure vessel and the elasticity of the spring (500). When the piston valve (300) moves linearly downward, it can open between the gas inlet passage (101) and the gas outlet passage (102). When the piston valve (300) moves linearly downward, the upper part of the piston valve (300) can come out downward from the gas inlet passage (101) to close between the gas inlet passage (101) and the gas outlet passage (102).

The fusible alloy (400) can be installed in the second internal space (203) of the second body (200). The fusible alloy (400) can support the piston valve (300) so that it cannot move linearly downward. The fusible alloy (400) can be melted at a predetermined temperature to enable the piston valve (300) to move linearly downward. Here, the predetermined temperature can be the ambient temperature of the pressure relief device (1) for a high-pressure vessel due to the fire in the event of a fire in the vehicle.

When the available alloy (400) is melted at the above-mentioned predetermined temperature in the event of a fire, the spring (500) can push the piston valve (300) downward in the linear movement direction with its own elastic force. That is, the spring (500) can provide elastic force to the piston valve (300) in the linear movement direction of the piston valve (300). The spring (500) can be formed in a coil shape that penetrates the upper end of the piston valve (300).

The other end of the piston valve (300) can penetrate the fusible alloy (400) in the downward direction of linear movement. Accordingly, the thickness of the fusible alloy (400) is formed thinly, so that when a fire occurs, the fusible alloy (400) melts at a relatively low temperature and is easily discharged, so that the operation of discharging the gas of the high-pressure vessel can be made smooth.

A plug insertion groove (204) may be formed at the bottom of the second body (200). The plug insertion groove (204) may be formed at the center of the lower surface of the second body (200) and may extend upward. The plug insertion groove (204) may be closed by a plug (600). The plug (600) may be inserted at the top into the plug insertion groove (204) to close the plug insertion groove (204). The plug (600) may prevent external foreign substances from entering the plug insertion groove (204).

Fig. 5 is a drawing showing the piston valve illustrated in Fig. 3, and Fig. 6 is an exploded perspective view of Fig. 5.

Referring to FIG. 4, FIG. 5 and FIG. 6, the piston valve (300) may include a piston portion (310), a valve shaft portion (320), and a pressurizing shaft portion (330).

The diameter of the piston portion (310) may be formed to be larger than the diameter of the valve shaft portion (320) and the diameter of the compression portion (330). The diameter of the valve shaft portion (320) may be formed to be larger than the diameter of the compression portion (330).

A first seal (315) may be installed on the outer surface of the piston part (310). The first seal (315) may have a circular cross-section. A first outer groove (317) may be formed on the outer surface of the piston part (310). The first seal (315) may be inserted and installed in the first outer groove (317). The first seal (315) may be in close contact with the inner surface of the second internal space (203) of the second body (200). The second seal (315) is in close contact with the inner surface of the second internal space (203), and can prevent gas that has entered the first internal space (103) and the second internal space (203) through the gas inlet passage (101) from flowing downward through the outer surface of the piston part (310) and the inner surface of the second internal space (203) toward the lower side of the piston part (310), thereby allowing sufficient gas pressure to be applied to the upper surface of the piston part (310) so that the piston valve (300) can smoothly move downward in a straight line.

The valve shaft portion (320) may be formed to protrude upward from the center of the upper surface of the piston portion (310) to form the upper portion of the piston valve (300). The end portion of the valve shaft portion (320) may be inserted and positioned into the gas inlet passage (101) formed in the first body (100). The end portion of the valve shaft portion (320) may be inserted and positioned into the gas inlet passage (101) formed in the first body (100), thereby closing the space between the gas inlet passage (101) and the gas outlet passage (102).

In addition, when the available alloy (400) is melted by the temperature at the time of fire and the piston valve (300) moves linearly downward, the end of the valve shaft (320) can come out of the gas inlet passage (101) of the first body (100) and open the space between the gas inlet passage (101) and the gas outlet passage (102).

The valve shaft portion (320) may include a main shaft portion (321) and a tip shaft portion (322). The diameter of the main shaft portion (321) may be formed to be larger than the diameter of the tip shaft portion (322). The diameter of the tip shaft portion (322) may be formed to be smaller than the diameter of the main shaft portion (321). The main shaft portion (321) may be formed to protrude upward from the center of the upper surface of the piston portion (310), and the tip shaft portion (322) may extend upward from the upper end of the main shaft portion (321). An inclined shaft portion (not indicated in the drawing) whose diameter becomes smaller as it goes upward may be formed between the upper end of the main shaft portion (321) and the lower end of the tip shaft portion (322). The length of the main shaft portion (321) may be formed to be longer than the length of the tip shaft portion (322). The length of the tip shaft portion (322) can be formed shorter than the length of the main shaft portion (321).

The valve shaft portion (320) can penetrate the spring (500). The spring (500) can pressurize the upper surface of the piston portion (310) to provide elasticity to the piston valve (300). To this end, the upper end of the spring (500) can contact the first step (S1, see FIG. 8) formed in the first body (100), and the lower end of the spring (500) can contact the upper surface of the piston portion (310).

A second seal (325, 326) may be installed on the outer surface of the end of the valve shaft (320). A second outer groove (327) may be formed on the outer surface of the end of the valve shaft (320). The second outer groove (327) may be formed on the outer surface of the end of the tip shaft (322). The second seal (325, 326) may be inserted and installed into the second outer groove (327). The second seal (325, 326) may be in close contact with the inner surface of the gas inlet passage (101) formed in the first body (100). When the valve shaft part (320) is inserted into the gas inlet passage (101) and the gas inlet passage (101) and the gas outlet passage (102) are closed, the second seal (325, 326) is in close contact with the inner surface of the gas inlet passage (101), thereby preventing gas flowing into the gas inlet passage (101) from the high-pressure vessel from flowing into the first internal space (103) through the outer surface of the valve shaft part (320) and the inner surface of the gas inlet passage (101).

The second sealing (325, 326) may include the second-first sealing (325) and the second-second sealing (326). However, at least one second sealing (325, 326) may be provided. The second-first sealing (325) may be arranged above the second-second sealing (326). The second-second sealing (326) may be arranged below the second-first sealing (325). The second-first sealing (325) may be formed to have a circular cross-section shape. The second-second sealing (326) may be formed to have a square cross-section shape, and one side of the second-second sealing (326) may be open.

The pressurized portion (330) can be formed by protruding from the center of the lower surface of the piston portion (310) to form the lower portion of the piston valve (300) that penetrates the fusible alloy (400). The fusible alloy (400) can support the lower surface of the piston portion (310).

Figure 7 is a perspective view showing the available alloy illustrated in Figure 3.

Referring to FIGS. 4 and 7, a through hole (410) may be formed in the fusible alloy (400). The through hole (410) may be formed at the center of the upper surface of the fusible alloy (400) and may extend downward. The through hole (410) may be formed with the same diameter from the center of the upper surface of the fusible alloy (400) to the center of the lower surface of the fusible alloy (400). The lower portion of the piston valve (300) may pass through the through hole (410). That is, the pressurizing portion (330) forming the lower portion of the piston valve (300) may pass through the through hole (410).

The diameter of the through hole (410) can be formed larger than the diameter of the pressurized portion (330), which is the lower portion of the piston valve (300). Accordingly, the pressurized portion (300) can be arranged to be able to move linearly up and down with respect to the fusible alloy (400). Through this, when the fusible alloy (400) is melted, the piston valve (300) can smoothly move linearly downward. In addition, since the thickness of the fusible alloy (400) is formed thin, the fusible alloy (400) can be quickly melted by the temperature when a fire occurs.

Fig. 8 is a drawing showing the first body illustrated in Fig. 4.

Referring to FIG. 4 and FIG. 8, the first internal space (103) formed in the first body (100) may include a first-first internal space (103A), a first-second internal space (103B), a first-third internal space (103C), and a first-fourth internal space (103D).

The 1-1st internal space (103A), the 1-2nd internal space (103B), the 1-3rd internal space (103C), and the 1-4th internal space (103D) can be arranged sequentially from top to bottom. That is, the 1-1st internal space (103A) can be arranged above the 1-2nd internal space (103B), the 1-2nd internal space (103B) can be arranged above the 1-3rd internal space (103C), and the 1-3rd internal space (103C) can be arranged above the 1-4th internal space (103D).

The 1-1 internal space (103A) may be formed to have a smaller diameter than the 1-2 internal space (103B), the 1-2 internal space (103B) may be formed to have a smaller diameter than the 1-4 internal space (103D), and the 1-3 internal space (103C) may be formed to have a diameter that gradually increases from top to bottom.

The first-first internal space (103A) can connect the gas inlet passage (101) and the gas outlet passage (102). The gas inlet passage (101) can extend upward from the first-first internal space (103A), and the gas outlet passage (102) can extend horizontally from the first-first internal space (103A).

The upper end of the spring (500) can be in contact with the first step (S1) formed at the upper end of the first-first internal space (103A), and the lower end of the spring (500) can be seated on the upper surface of the piston part (310). Accordingly, when the fusible alloy (400) is melted by the temperature at the time of fire, the piston valve (300) can push out the molten fusible alloy (400) by moving downward by the elastic force of the spring (500).

The upper end of the second body (200) may be in contact with the second step (S2) formed at the upper end of the 1-2 internal space (103B). A screw thread may be formed on the inner surface of the 1-4 internal space (103D) to be connected to the screw thread formed on the outer surface of the second body (200).

FIG. 9 is a drawing showing the second body illustrated in FIG. 3, FIG. 10 is an exploded perspective view of FIG. 9, and FIG. 11 is a bottom perspective view of FIG. 9.

Referring to FIG. 4 and FIGS. 8 to 11, a third sealing (225) may be installed on the outer surface of the upper portion of the second body (200). The third sealing (225) may be formed to have a circular cross-section shape. A third outer groove (227) may be formed on the outer surface of the upper portion of the second body (200), and the third sealing (225) may be inserted and installed in the third outer groove (227). The third sealing (227) may be in close contact with the inner surface of the first internal space (103). The third sealing (225) may be in close contact with the inner surface of the first-second internal space (103B). The third seal (225) is in close contact with the inner surface of the first-second internal space (103B), so as to prevent gas flowing into the first-first internal space (103A) from the gas inlet passage (101) from flowing into the first-third internal space (103C) and the first-fourth internal space (103D) through the outer surface of the upper portion of the second body (200) and the inner surface of the first-second internal space (103B), thereby allowing sufficient gas pressure to be applied to the upper surface of the piston portion (310) so that the piston valve (300) can smoothly move downward in a straight line.

The second body (200) may include a tool fastening portion (210), a body insertion portion (220), and a body fastening portion (230).

In the tool fastening portion (210), a tool that rotates the second body (200) can be fastened to insert the upper portion of the body fastening portion (230) from the lower portion of the first body (100) into the first internal space (103) and then fasten the second body (200) to the first body (100). A plurality of flat portions to which the tool is fastened are formed along the circumferential direction on the outer surface of the tool fastening portion (210), so that the outer surface of the tool fastening portion (210) can be formed in a polygonal shape.

The body insertion portion (220) may be formed to protrude upwardly on the upper surface of the tool fastening portion (210). The third outer peripheral groove (227) may be formed on the outer peripheral surface of the upper portion of the body insertion portion (220). The upper end of the body insertion portion (220) may be in contact with the second step (S2) formed on the upper end of the first-second internal space (103B) of the first body (100).

The body fastening portion (230) may be formed on the outer surface of the body insert portion (220) with a diameter larger than that of the body insert portion (220). The body fastening portion (230) may be formed between the upper portion of the body insert portion (220) and the lower portion of the body insert portion (220). A screw thread may be formed on the outer surface of the body fastening portion (230) to be fastened with a screw thread formed on the inner surface of the 1-4th internal space (103D) of the first body (100).

When the second body (200) is connected to the first body (100), the upper portion of the body insertion portion (220) and the body fastening portion (230) can be inserted and positioned within the first internal space (103) of the first body (100), and the lower portion of the body insertion portion (220) and the tool fastening portion (210) can be positioned to protrude from the lower portion of the first body (100).

A center hole (205) and a molten material discharge hole (206) can be formed on the upper surface, which is the inner surface of the plug insertion groove (204).

The center hole (205) is formed at the center of the upper surface of the plug insertion groove (204) and can be connected to the second internal space (203) of the second body (200). The pressurized portion (330) of the piston valve (300) can be positioned in the center hole (205) so as to be able to move up and down linearly.

The molten material discharge hole (206) may be formed as a plurality of molten material discharge holes (206) spaced apart from each other in the circumferential direction on the upper surface of the plug insertion groove (204). The plurality of molten material discharge holes (206) may be formed radially outside the center hole (205). In the present embodiment, the plurality of molten material discharge holes (206) are formed as six, but may also be formed as at least one molten material discharge hole (206). The molten material discharge hole (206) may be formed in the linear movement direction of the piston valve (300) by communicating with the second internal space (203) of the second body (200). When the fusible alloy (400) is melted by the temperature at the time of fire, the molten fusible alloy (400) can be discharged through the molten material discharge hole (206) into the plug insertion groove (204) and then discharged to the outside through the lower end of the second body (200).

The plug (600) can open the plug insertion groove (204) by being pressurized by the pressurized shaft (330) when moving linearly downwards of the piston valve (300). When the fusible alloy (400) is melted by the temperature at the time of fire occurrence, the piston valve (300) can be moved linearly downwards by the elastic force of the spring (500), and accordingly, the plug (600) can be pressed by the pressurized shaft (330) of the piston valve (300) to come out of the plug insertion groove (204), so that the plug insertion groove (204) can be opened first, and in the state where the plug insertion groove (204) is open, the molten fusible alloy (400) can be discharged through the molten material discharge hole (206) into the plug insertion groove (204) and then discharged to the outside through the lower end of the second body (200).

Fig. 12 is a drawing showing the initial stage of the operation in which the fusible alloy melts and is discharged when a fire occurs in the same state as Fig. 4, and Fig. 13 is a drawing showing the state in which the fusible alloy melts and is completely discharged when a fire occurs in the same state as Fig. 4.

Referring to FIG. 4 and FIGS. 11 to 13, the pressure relief device (1) for a high-pressure vessel according to an embodiment of the present invention in a state where no fire has occurred is in the state shown in FIG. 4.

When a fire occurs in a state as shown in FIG. 4, the fusible alloy (400) begins to melt due to the temperature at the time of the fire, and the supporting force supporting the piston valve (300) weakens. Accordingly, as shown in FIG. 12, the piston valve (300) begins to move downward in a straight line due to the elastic force of the spring (500), and the molten fusible alloy (400) flows into the molten material discharge hole (206), and the pressurized shaft (330) of the piston valve (300) presses the plug (600) downward to pull it out into the plug insertion groove (204), thereby opening the plug insertion groove (204).

Thereafter, when the available alloy (400) is completely melted by the temperature at the time of the fire, as shown in FIG. 13, the piston valve (300) moves completely downward in a straight line, and accordingly, the molten available alloy (400) is discharged to the lower exterior of the second body (200) through the molten material discharge hole (206) and the plug insertion groove (204) and is completely discharged from the second internal space (203) of the second body (200). In this state, the valve shaft portion (320), which is the upper portion of the piston valve (300), comes out of the gas inlet passage (101), so that the space between the gas inlet passage (101) and the gas outlet passage (102) is opened, and therefore, the gas that flows into the gas inlet passage (101) from the high-pressure gas container is discharged to the outside of the outer surface of the first body (100) through the gas outlet passage (102), as indicated by the arrow in FIG. 13.

As described above, in the pressure relief device (1) for a high-pressure vessel according to the embodiment of the present invention, since the lower part of the piston valve (300) penetrates the fusible alloy (400) in a linear movement direction, the thickness of the fusible alloy (400) is formed thin, so that when a fire occurs, the fusible alloy (400) melts at a relatively low temperature and is easily discharged, so that the operation of discharging the gas of the high-pressure vessel can be made smooth.

In addition, since the pressure relief device (1) for a high-pressure vessel according to an embodiment of the present invention has a molten material discharge hole (206) for discharging the molten fusible alloy (400) formed in the linear movement direction of the piston valve (300), the molten fusible alloy (400) is quickly discharged through the molten material discharge hole (206), so that gas in the high-pressure vessel can be quickly discharged in the event of a fire.

Those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical idea or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

1: Pressure relief device for high pressure vessel 100: First body
101: Gas inlet path 102: Gas outlet path
103: 1st internal space 200: 2nd body
203: Second internal space 204: Plug insertion groove
205: Center hole 206: Melt discharge hole
225: 3rd shilling 227: 3rd outer home
300: Piston valve 310: Piston part
315: 1st sill 317: 1st outer home
320: Valve shaft 325, 326: Second seal
327: 2nd outer home 330: Compression unit
400: Available alloy 410: Through hole
500 : Spring 600 : Plug

Claims (8)

A first body having a gas inlet passage and a gas outlet passage formed therein, and a first internal space communicating with the gas inlet passage and the gas outlet passage;
A second body coupled to the first body and having a second internal space formed therein that is connected to the first internal space;
A piston valve which is installed in the second internal space so as to be able to move in a straight line, and has one end protruded through one end of the second body into the first internal space to close the gas inlet passage and the gas outlet passage, and opens the gas inlet passage and the gas outlet passage when moving in a straight line; and
A fusible alloy is installed in the second internal space to support the piston valve so that it cannot move in a straight line, and is melted at a predetermined temperature to enable the piston valve to move in a straight line;
A pressure relief device for a high-pressure vessel in which the other end of the piston valve penetrates the available alloy in a linear direction. In claim 1,
A pressure relief device for a high-pressure vessel, wherein a through hole through which the other end of the piston valve penetrates is formed in the above-mentioned available alloy. In claim 1,
The above piston valve,
The piston part,
A valve shaft portion that is formed by protruding from the center of one side of the piston portion to form one end of the piston valve, and whose end is inserted into the gas inlet passage to close the gap between the gas inlet passage and the gas outlet passage, and whose end is pulled out of the gas inlet passage when the piston valve moves linearly to open the gap between the gas inlet passage and the gas outlet passage;
It includes a compression member that is formed protrudingly at the center of the surface of the piston part and forms the other end of the piston valve that penetrates the available alloy.
The above-mentioned available alloy is a pressure relief device for a high-pressure vessel that supports the other surface of the piston part. In claim 3,
A pressure relief device for a high-pressure vessel, further comprising a spring that penetrates the valve shaft and pressurizes one surface of the piston to provide elasticity to the piston valve. In claim 3,
A plug insertion groove is formed at the other end of the second body,
On the inner surface of the plug insertion groove, a center hole is formed in the direction of linear movement of the piston valve, which is connected to the second internal space and in which the pressurized portion is arranged to be able to move linearly, and a molten discharge hole is formed in the direction of linear movement of the piston valve, which is connected to the second internal space and in which the melted alloy is discharged.
A pressure relief device for a high-pressure vessel, further comprising a plug that closes the plug insertion groove and opens the plug insertion groove by being pressurized by the pressurized shaft when the piston valve moves linearly. In claim 3,
A first outer peripheral groove is formed on the outer peripheral surface of the above piston part,
A pressure relief device for a high-pressure vessel, further comprising: a first sealing member inserted into the first outer groove and in close contact with the inner surface of the second inner space. In claim 3,
A second outer peripheral groove is formed on the outer peripheral surface of the end of the valve shaft portion.
A pressure relief device for a high-pressure vessel further comprising at least one second sealing ring inserted into the second outer groove and in close contact with the inner surface of the gas inlet passage. In claim 1,
One end of the above second body is inserted and installed into the above first internal space,
A third outer groove is formed on one end of the outer surface of the second body.
A pressure relief device for a high-pressure vessel further comprising a third sealing member inserted into the third outer groove and in close contact with the inner surface of the first inner space.

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