Temperature-driven safety relief device

Abstract

The utility model discloses a temperature-driven safety relief device, which is mainly used for high-temperature pressure relief of a bottleneck valve of a high-pressure hydrogen bottle, and specifically comprises a valve core, a valve body and a valve cover, one end of the valve body is provided with a first through port and a second through port, and the first through port and the second through port are communicated through an inner cavity of the valve body; the valve cover is installed at the opening of the inner cavity of the valve body and is sealed through a first sealing ring, a fusible alloy plug is arranged in the valve cover in a sleeved mode, and a discharging opening is formed in the end, away from the check ring, of the valve cover and is communicated with the inner cavity of the valve cover. The utility model belongs to the technical field of valves, through the communication of the second port and the first port, hydrogen in the first port is discharged outwards through the second port under the pressure effect, so as to achieve the effect of safe release, the gas pressure in the gas cylinder can be reduced in time, and the explosion caused by the increase of the pressure in the gas cylinder due to the overhigh environment temperature is avoided; therefore, potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a temperature-driven safety relief device. Background Art

[0002] The hydrogen storage method adopts high-pressure hydrogen storage in hydrogen storage cylinders. The reasonable and effective use of high-pressure hydrogen in the hydrogen storage cylinders is inseparable from the bottle valve at the bottle mouth. The high-pressure hydrogen in the hydrogen storage cylinders must be processed by the bottle valve at the bottle mouth and the subsequent system before it can be supplied to the fuel cell. Therefore, the bottle valve at the bottle mouth is an extremely important component in the hydrogen supply system, and its performance directly affects the normal operation of the fuel cell, the use efficiency of the hydrogen supply system, and the safety performance of the hydrogen supply system.

[0003] The pressure relief device on the common high-pressure bottle valve on the market is to integrate a fusible alloy plug on the main valve body of the bottle valve for pressure relief. However, there are certain defects in the design of the current fusible alloy plug pressure relief device. Gas leakage may occur after the fusible alloy plug melts, and the safety and reliability are relatively low. Summary of the Utility Model

[0004] Therefore, the utility model provides a temperature-driven safety relief device to solve the above problems in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A temperature-driven safety relief device is mainly used for high-temperature pressure relief of the bottle valve of a high-pressure hydrogen cylinder, and specifically includes a valve core, a valve body, and a valve cover. One end of the valve body has a first port and a second port, and the first port and the second port are connected through the inner cavity of the valve body;

[0007] The valve cover is installed at the opening of the inner cavity of the valve body and is sealed by a first sealing ring. A fusible alloy plug is sleeved inside the valve cover. One end of the valve cover away from the retaining ring has a discharge port, and the discharge port is connected to the inner cavity of the valve cover;

[0008] The valve core is slidably arranged in the valve body. The front end of the valve core extends into the first port and is sealed by a sealing component to block the connection between the first port and the second port. The rear end of the valve core abuts against the fusible alloy plug through an elastic member in a compressed state, and the rear end of the valve core is sealed with the inner wall of the valve cover through a sealing ring.

[0009] As a further optimized scheme of the utility model, the sealing component includes a retaining ring and a third sealing ring. The retaining ring is installed in the opening on the side of the first port close to the second port. The number of retaining rings is two and they are arranged in parallel. The third sealing ring is arranged between the two retaining rings. The front end of the valve core penetrates through the retaining ring and the third sealing ring, and the outer wall of the front end of the valve core is closely attached to the inner wall of the third sealing ring.

[0010] As a further optimized solution of the present utility model, the outer wall of the front end of the valve cover has an external thread, the inner wall of the opening of the valve body has an internal thread, and the front end of the valve cover is threadedly engaged with the opening of the valve body.

[0011] As a further optimized solution of the present utility model, a ring groove adapted to the first sealing ring is provided on the inner wall of the valve body, the first sealing ring is installed in the ring groove, and the outer wall of the front end of the valve cover is in close contact with the inner wall of the first sealing ring.

[0012] As a further optimized solution of the present utility model, the rear end of the valve core has an annular protrusion, the elastic member is a spring and is sleeved on the outer wall of the valve core, one end of the spring abuts against the side wall of the annular protrusion, and the other end of the spring abuts against the inner wall of the opposite side of the valve body.

[0013] As a further optimized solution of the present utility model, an annular groove is provided on the outer wall of the annular protrusion of the valve core along its circumferential direction, the second sealing ring is installed in the annular groove, and the outer edge of the second sealing ring extends outside the annular groove and is in close contact with the inner wall of the valve cover.

[0014] The present utility model has the following advantages:

[0015] By inserting the front end of the valve core into the retaining ring and utilizing the sealing effect of the third sealing ring, the hydrogen in the first through port cannot communicate with the second through port, thereby preventing hydrogen from leaking under normal working conditions. When the ambient temperature does not reach the melting point of the fusible alloy plug, the whole device does not operate. When the ambient temperature exceeds the melting point of the fusible alloy plug, the ambient temperature is conducted to the fusible alloy plug, causing the fusible alloy plug to melt rapidly. Under the combined action of the high-pressure hydrogen in the first through port and the elastic member after the blocking effect of the fusible alloy plug is lost, the rear end of the valve core continuously moves towards the inside of the valve cover. While the valve core moves, the molten liquid of the fusible alloy plug is discharged outward through the discharge port. At this time, the second through port communicates with the first through port, and the hydrogen in the first through port is discharged outward through the second through port under the action of pressure, so as to achieve the function of safe discharge, timely reduce the gas pressure in the gas cylinder, and avoid explosion caused by the increase of the gas pressure in the gas cylinder due to too high ambient temperature, thereby reducing the occurrence of potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of a temperature-driven safety relief device provided by the present utility model.

[0017] In the figure: 1, retaining ring; 2, third sealing ring; 3, valve core; 4, elastic member; 5, first sealing ring; 6, valve body; 7, second sealing ring; 8, fusible alloy plug; 9, valve cover; 10, discharge port; 11, first through port; 12, second through port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present utility model.

[0019] As Figure 1 shown, a temperature-driven safety relief device is mainly used for high-temperature pressure relief of the bottle mouth valve of a high-pressure hydrogen cylinder, and specifically includes a valve core 3, a valve body 6, and a valve cover 9. One end of the valve body 6 has a first port 11 and a second port 12, and the first port 11 and the second port 12 are connected through the inner cavity of the valve body 6;

[0020] The valve cover 9 is installed at the opening of the inner cavity of the valve body 6 and is sealed by a first sealing ring 5. A fusible alloy plug 8 is sleeved inside the valve cover 9. One end of the valve cover 9 away from the retaining ring 1 has a discharge port 10, and the discharge port 10 is connected to the inner cavity of the valve cover 9;

[0021] It should be noted that the fusible alloy plug 8 is made of a conventional fusible alloy material in the prior art, and the melting point of the fusible alloy plug 8 is 110 °C;

[0022] The valve core 3 is slidably arranged in the valve body 6. The front end of the valve core 3 extends into the first port 11 and is sealed by a sealing assembly to block the connection between the first port 11 and the second port 12. The rear end of the valve core 3 abuts against the fusible alloy plug 8 through an elastic member 4 in a compressed state, and the rear end of the valve core 3 is sealed with the inner wall of the valve cover 9 by a second sealing ring 7.

[0023] Specifically, the sealing assembly includes a retaining ring 1 and a third sealing ring 2. The retaining ring 1 is installed in the opening on the side of the first port 11 close to the second port 12. The number of the retaining rings 1 is two and they are arranged in parallel. The third sealing ring 2 is arranged between the two retaining rings 1. The front end of the valve core 3 penetrates through the retaining ring 1 and the third sealing ring 2, and the outer wall of the front end of the valve core 3 is closely attached to the inner wall of the third sealing ring 2, which can improve the sealing performance between the front end of the valve core 3 and the third sealing ring 2, so as to isolate the first port 11 from the second port 12 to ensure the normal storage of hydrogen in the gas cylinder.

[0024] Specifically, the outer wall of the front end of the valve cover 9 has an external thread, and the inner wall of the opening of the valve body 6 has an internal thread. The front end of the valve cover 9 is threadedly engaged with the opening of the valve body 6, which is convenient for actual disassembly and assembly work.

[0025] Specifically, an annular groove adapted to the first sealing ring 5 is formed in the inner wall of the valve body 6. The first sealing ring 5 is installed in the annular groove, and the axes of the first sealing ring 5, the annular groove, and the valve body 6 coincide. The front outer wall of the valve cover 9 is in close contact with the inner wall of the first sealing ring 5, which can improve the tightness of the combination between the valve cover 9 and the valve body 6.

[0026] Specifically, the rear end of the valve core 3 has an annular protrusion. The elastic member 4 is a spring and is sleeved on the outer wall of the valve core 3. One end of the spring abuts against the side wall of the annular protrusion, and the other end of the spring abuts against the inner wall of the opposite side of the valve body 6.

[0027] As Figure 1 shown, one side of the inner cavity of the valve body 6 close to the second port 12 has a step, and the step surface is opposite to the end surface of the annular protrusion at the rear end of the valve core 3. The two ends of the spring respectively abut against the step surface and the end surface of the annular protrusion. In the initial state, the spring is in a compressed state, so that the valve core 3 presses against the fusible plug 8. When the fusible plug 8 melts at high temperature, the spring elongates. Under the action of the gas pressure in the first port 11, the valve core 3 continuously moves into the valve cover 9, so that the molten alloy liquid of the fusible plug 8 is discharged to the discharge port 10. The front end of the valve core 3 is withdrawn from the retaining ring 1, so that the first port 11 is connected to the second port 12, thus playing the role of high-temperature relief.

[0028] Furthermore, an annular groove is formed in the outer wall of the annular protrusion of the valve core 3 along its circumferential direction. The second sealing ring 7 is installed in the annular groove. The outer edge of the second sealing ring 7 extends outside the annular groove and is in close contact with the inner wall of the valve cover 9, which is beneficial to improving the sealing performance between the inner cavity of the valve body 6 and the inner cavity of the valve cover 9 and preventing gas from leaking to the outside of the valve cover 9.

[0029] In summary, in the present utility model, the front end of the valve core 3 is inserted into the retaining ring 1. By using the sealing effect of the third sealing ring 2, the hydrogen in the first port 11 cannot communicate with the second port 12, so that hydrogen cannot leak under normal working conditions. When the ambient temperature does not reach the melting point of the fusible plug 8, the whole does not act. When the ambient temperature exceeds the melting point of the fusible plug 8, the ambient temperature is conducted to the fusible plug 8, causing the fusible plug 8 to melt rapidly (the valve body 6 and the valve cover 9 are both made of metal materials, which are easy to conduct heat). Under the combined action of the loss of the blocking effect of the fusible plug 8 and the high-pressure hydrogen in the first port 11 and the elastic member 4, the rear end of the valve core 3 continuously moves into the valve cover 9. While the valve core 3 moves, the molten liquid of the fusible plug 8 is discharged outward through the discharge port 10. At this time, the second port 12 is connected to the first port 11, and the hydrogen in the first port 11 is discharged outward through the second port 12 under the action of pressure to achieve the function of safe relief, which can timely reduce the gas pressure in the gas cylinder and avoid explosion caused by the increase of the gas pressure in the gas cylinder due to too high ambient temperature, thereby reducing the occurrence of potential safety hazards.

Claims

1. A temperature-driven safety release device, characterized in that: The valve comprises a valve core (3), a valve body (6), and a valve cover (9); one end of the valve body (6) has a first opening (11) and a second opening (12); the first opening (11) and the second opening (12) are connected through the inner cavity of the valve body (6); The valve cover (9) is installed at the inner cavity opening of the valve body (6) and is sealed by a first sealing ring (5). A fusible alloy plug (8) is sleeved inside the valve cover (9). An end of the valve cover (9) away from the retaining ring (1) has a discharge port (10), and the discharge port (10) is in communication with the inner cavity of the valve cover (9); The valve core (3) is slidably arranged in the valve body (6); the front end of the valve core (3) extends into the first opening (11) and is sealed by a sealing component to block the communication between the first opening (11) and the second opening (12); the rear end of the valve core (3) is in contact with the fusible alloy plug (8) through an elastic member (4) in a compressed state, and the rear end of the valve core (3) is sealed with the inner wall of the valve cover (9) through a second sealing ring (7).

2. A temperature-driven safety release device according to claim 1, characterized in that: The sealing assembly comprises a retaining ring (1) and a third sealing ring (2); the retaining ring (1) is installed in an opening on one side of the first opening (11) close to the second opening (12); the retaining rings (1) are two in number and are arranged parallel to each other; the third sealing ring (2) is arranged between the two retaining rings (1); the front end of the valve core (3) passes through the retaining ring (1) and the third sealing ring (2), and the front end outer wall of the valve core (3) is tightly attached to the inner wall of the third sealing ring (2).

3. A temperature-driven safety release device according to claim 1, characterized in that: The front end outer wall of the valve cover (9) has an external thread, the opening inner wall of the valve body (6) has an internal thread, and the front end of the valve cover (9) is threadedly engaged with the opening of the valve body (6).

4. A temperature-driven safety release device according to claim 3, characterized in that: The inner wall of the valve body (6) is provided with an annular groove matched with the first sealing ring (5), the first sealing ring (5) is installed in the annular groove, and the front end outer wall of the valve cover (9) is tightly attached to the inner wall of the first sealing ring (5).

5. A temperature-driven safety release device according to claim 1, characterized in that: The rear end of the valve core (3) has an annular protrusion, and the elastic member (4) is a spring and is sleeved on the outer wall of the valve core (3). One end of the spring abuts against the side wall of the annular protrusion, and the other end of the spring abuts against the inner wall of the opposite side of the valve body (6).

6. A temperature-driven safety relief device according to claim 5, characterized in that: The outer wall of the annular protrusion of the valve core (3) is provided with an annular groove arranged along its circumference, and the second sealing ring (7) is installed in the annular groove. The outer edge of the second sealing ring (7) extends outside the annular groove and is tightly attached to the inner wall of the valve cover (9).

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