JP7054515B2 - Fusible plug type safety valve - Google Patents

Description

The present invention relates to a fusible plug type safety valve.

A safety valve that opens the gas in the container and a safety valve that shuts off the outflow of the gas in the container are known when the temperature rises in the event of a fire or the like.

The safety valve described in Patent Document 1 (see FIG. 5) is a safety valve 21 attached to the container 22. The safety valve 21 urges the fusible plug 31 in contact with the lower surface of the top wall 23a attached to the upper part of the main body 23, the moving member 24 in contact with the lower surface of the fusible plug 31, and the moving member 24 upward. It has a compression coil spring 25, and a gas opening passage 27 for releasing gas when the temperature rises is opened in the peripheral wall 23b of the main body 23, and a melt fusible plug body 26 is provided in the peripheral wall 23b and the top wall 23a. A melt-fusible plug passage 26 is opened to allow the gas to escape.

The safety valve described in Patent Document 2 (see FIG. 6) is a safety valve 41 attached to the container 43. The safety valve 41 has a protrusion at the center of the left end of the main body 42, and is provided with a fusible plug 52 in contact with the right end surface of the protrusion. The fusible plug 52 is provided at the center of the left end of the moving member 54. It is put in a hollow. The moving member 54 is urged to the left by the compression coil spring 55. The movable plug 44 is in contact with the right end of the moving member 54 so as to be orthogonal to the moving member 54, and the movable plug 44 is arranged in the movable plug placement passage 45 communicating with the gas in the container 43. .. At the upper part of the container 43, an escape passage 46 communicating with the movable plug arrangement passage 45 is opened.

Japanese Unexamined Patent Publication No. 2012-132475 Japanese Unexamined Patent Publication No. 2016-125596

In the fusible plug type safety valve (see FIG. 5) described in Patent Document 1, when the temperature rises, the fusible plug 31 melts and flows out from the fusible plug passage 26. The moving member 24 is urged upward by the compression coil spring 25 and moves upward. When the moving member 24 moves upward, the seal between the moving member 24 and the peripheral wall 23b is broken, and the gas is released to the outside through the gas opening passage 27.

In the safety valve described in Patent Document 1 (see FIG. 5), since the fusible plug passage 26 is opened on the side surface of the fusible plug body 31, the urging force of the compression coil spring 25 and the pressure of the gas in the container 22 When the fusible plug 31 is compressed by the fusible plug 31 and the fusible plug 31 undergoes creep deformation, and the solid fusible plug 31 partially enters the fusible plug passage 26, the moving fusible plug 24 moves upward. Therefore, the safety valve 21 may operate below a predetermined temperature. Further, when the temperature becomes higher than a predetermined temperature and the fusible plug 31 is melted, a part of the melted fusible plug 31 is formed through a gap between the peripheral wall 23b and the side surface of the head of the moving member 24 to compress the coil spring 25. As a safety device, even if the melted fusible plug 31 enters the gas opening passage 27 and blocks this passage so that the gas cannot be released to the outside and the temperature rises above a predetermined temperature. It may not work.

In the plugging type safety valve (see FIG. 6) described in Patent Document 2, when the temperature rises, the fusible plug 52 melts and flows into the space where the compression coil spring 23b is arranged. The moving member 54 is urged to the left by the compression coil spring 55 and moves to the left. When the moving member 54 moves to the left, the movable plug 44 moves upward, the seal between the movable plug 44 and the side peripheral surface of the movable plug placement passage 45 is broken, and the gas escapes through the passage 46. Through it, the gas is released to the outside.

In the safety valve described in Patent Document 2 (see FIG. 6), the melted fusible plug 52 flows into the space where the compression coil spring 23b is arranged, so that the escape passage 46 is blocked by the melted fusible plug 52. A relief passage 46 is provided at the top of the container 43 at a distance from the fusible plug 52 so that it does not come off. However, since the structure is such that the movable plug body 46 must be newly provided, the structure becomes complicated and the cost increases.

An object of the present invention is to provide a fusible plug type safety valve that does not malfunction below a predetermined temperature and does not block the gas release passage when the safety valve operates.

The fusible plug type safety valve according to the present invention (1) is a fusible plug type safety valve that is attached to a container and releases gas in the container when the temperature rises above a predetermined temperature, and has a bottomed tubular shape. A fusible plug body having a main body gas passage communicating with the inside of the container at the bottom, a fusible plug body arranged so that one end surface abuts on the inner surface of a lid member closing the opening of the main body, and the fusible plug body. A moving member consisting of a head that abuts on the other end surface and slides into the inner peripheral surface of the main body, and a shaft portion that extends from the head to the bottom side and seals the main body gas passage, and a surface on the bottom side of the head. It has a porous member having a through hole through which the shaft portion penetrates, and an urging member arranged between the inner surface of the bottom portion of the main body and the bottom side surface of the porous member. The peripheral wall near the bottom of the main body is provided with a gas opening passage through which the porous member is a fusible plug type safety valve having a capacity to receive the melted fusible plug. In the plug-type safety valve according to the present invention (1), when the temperature rises above a predetermined temperature and the fusible plug melts and the moving member moves to the lid member side, the seal of the main body gas passage is broken. The inside of the container and the gas release passage are communicated with each other, and the melted fusible plug passes between the inner peripheral surface of the main body and the outer peripheral surface of the head to form the porous member. I try to flow in and trap.

The fusible plug type safety valve of the present invention (1) is a safety valve that releases the gas in the container when the temperature reaches a predetermined temperature or higher.

According to the plug-type safety valve of the present invention (1), since the fusible plug passage as described in Patent Document 1 is not provided, the fusible plug does not creep at a temperature lower than a predetermined temperature, and creeps. It does not cause malfunction due to the phenomenon.

Further, even if the melted fusible plug flows into the space where the urging member is arranged through the gap between the outer peripheral surface of the head of the moving member and the inner peripheral surface of the main body, it is trapped by the porous member. Therefore, since the gas opening passage is not blocked, it is not necessary to take a complicated structure like the safety valve described in Patent Document 2, and the manufacturing cost is reduced.

The fusible plug type safety valve according to the present invention (2) is a fusible plug type safety valve that is attached to a container and closes the gas in the container when the temperature rises above a predetermined temperature, and has a bottomed tubular shape. A fusible plug body having a main body gas passage communicating with the inside of the container at the bottom, a fusible plug body arranged so that one end surface abuts on the inner surface of a lid member closing the opening of the main body, and the fusible plug body. A moving member that abuts on the other end surface and has a head that is in sliding contact with the inner peripheral surface of the main body and a shaft portion that extends from the head to the bottom side, and the shaft portion is a small diameter portion on the head side. The large-diameter portion is composed of a large-diameter portion connected to the small-diameter portion, and the large-diameter portion abuts on a moving member protruding toward the container side from the main body gas passage and a surface on the bottom side of the head. It has a porous member having a through hole through which a diameter portion penetrates, and an urging member arranged between an inner surface of the bottom of the main body and a surface on the bottom side of the porous member, and has a urging member in the vicinity of the bottom of the main body. The peripheral wall is provided with a gas opening passage through which the porous member is a fusible plug type safety valve having a capacity to receive the melted fusible plug. In the plugging type safety valve according to the present invention (2), when the fusible plug body melts when the temperature rises above a predetermined temperature and the moving member moves to the lid member side, the main body gas is provided by the large diameter portion. The passage is sealed, the inside of the container and the gas release passage are closed, and the melted fusible plug passes between the inner peripheral surface of the main body and the outer peripheral surface of the head, and is porous. It flows into the quality member and is trapped.

The fusible plug type safety valve of the present invention (2) is a safety valve that closes the outflow of gas in the container when the temperature reaches a predetermined temperature or higher.

According to the plug-type safety valve of the present invention (2), the fusible plug does not creep at a temperature lower than a predetermined temperature as in the plug-type safety valve of the present invention (1), and malfunction due to the creep phenomenon occurs. It won't wake you up. Further, since it is not necessary to have a complicated structure like the safety valve described in Patent Document 2, the manufacturing cost is reduced.

According to the fusible plug type safety valve of the present invention, a malfunction does not occur at a temperature lower than a predetermined temperature, the structure is simple, and the manufacturing cost can be reduced.

FIG. 1 is a vertical sectional view of a first embodiment of a fusible plug type safety valve according to the present invention. FIG. 2 is a vertical sectional view when the fusible plug type safety valve of the first embodiment is activated. FIG. 3 is a vertical cross-sectional view of Example 2 of the fusible plug type safety valve according to the present invention. FIG. 4 is a vertical sectional view when the fusible plug type safety valve of the second embodiment is operated. FIG. 5 is a vertical cross-sectional view of a conventional fusible plug type safety valve. FIG. 6 is a vertical cross-sectional view of a conventional fusible plug type safety valve.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. For convenience, the directions of parts and the like may be referred to as up, down, left, and right depending on the directions on the drawings, but these do not limit the scope of the present invention.

FIG. 1 shows a vertical sectional view of a first embodiment of the fusible plug type safety valve of the present invention, and the fusible plug type safety valve of the first embodiment shows a gas in a container when the temperature rises above a predetermined temperature. It is a fusible plug type safety valve that opens.

The fusible plug type safety valve 1 of the first embodiment is attached to the container 2 by a screw, and the upper end surface abuts on the bottom surface of the main body 3 having a bottomed tubular shape and the lid member 9 provided on the upper part of the main body 3. A moving member 4 composed of a fusible plug 7 arranged in such a manner, a head portion 4a and a shaft portion 4b that abut on the lower surface of the fusible plug body 7, and a shaft portion 4b that abuts on the lower surface of the head portion 4a. It has a porous member 8 having a through hole 8a through which it penetrates, and a compression coil spring 5 which is an urging member arranged between the bottom inner surface 3f and the lower surface of the porous member 8. As shown in the figure, the fusible plug type safety valve 1 has a threaded portion formed at the lower end of the main body 3 and attached to the container 2, and for example, a flange is provided at the lower end of the main body 3 and the container is provided with a fastening means such as a bolt. Various mounting forms such as mounting on 2 can be adopted.

The lid member 9 and the main body 3 are connected by a male threaded portion 9a provided on the lid member 9 and a female threaded portion 3d provided on the upper part of the inner peripheral surface of the peripheral wall 3a of the main body 3.

The main body 3 and the container 2 are sealed by an O-ring 10a, and the main body gas passage 3e is sealed by an O-ring 10b interposed between the shaft portion 4b and the inner peripheral surface of the bottom portion 3g. Is sealed by an O-ring 10c interposed between the upper surface 3c of the main body and the lower surface of the lid member 9.

A gas opening passage 6 is opened in the peripheral wall 3a near the bottom 3g. The container 2 is provided with a container gas passage 2a that communicates the inside filled with gas with the main body gas passage 3e. This container gas passage 2a is not always necessary, and the main body gas passage 3e may directly communicate with the inside of the container 2.

FIG. 2 shows a state when the safety valve of FIG. 1 is activated. Since the temperature became above the predetermined temperature, the fusible plug 7 melted and flowed downward through a slight gap between the side surface of the head 4a and the inner peripheral surface 3b, and was trapped by the porous member 8. It is no longer in its original position.

The moving member 4 is urged upward by the pressure of the gas in the compression coil spring 5 and the container 2 to move, the shaft portion 4b is disengaged from the O ring 10b, the cutoff of the main body gas passage 3e is broken, and the inside of the container 2 is broken. The gas is discharged to the outside through the container gas passage 2a, the main body gas passage 3e, and the gas opening passage 6. The gas release passage 6 may be formed at the position shown in FIG.

The porous member 8 is cooled by the gas released to the outside from the gas opening passage 6, and the melted fusible plug 7 trapped in the porous member 8 is solidified and fixed inside the porous member 8. .. As a result, the fusible plug 7 melted does not block the gas opening passage 6 with the fusible plug 7 melted.

FIG. 3 shows a vertical sectional view of a second embodiment of the fusible plug type safety valve of the present invention, and the fusible plug type safety valve of the second embodiment causes gas outflow when the temperature rises above a predetermined temperature. It is a fusible plug type safety valve that closes.

A part of the same structural portion as the fusible plug type safety valve of the first embodiment of FIG. 1 will be omitted.

The shaft portion 4b of the moving member 4 has a small diameter portion 4c and a large diameter portion 4d, and in the state before the operation of the safety valve in FIG. 3, the outer peripheral surface of the small diameter portion 4c and the inner surface of the main body gas passage 3e There is a gap between them so that gas can pass through. The large diameter portion 4d is located below the lower opening of the main body gas passage 3e.

When the temperature rises above a predetermined temperature, the fusible plug 7 melts and flows into the porous member 8, and the moving member 4 moves upward, the large diameter portion 4d enters the main body gas passage 3e and has a large diameter. The outer peripheral surface of the part 4d and the O-ring 10b are in pressure contact with each other to cut off the gas flow, and the safety valve is activated.

1: Safety valve
2: Container
2a: Container gas passage
3: Main body
3a: Surrounding wall
3b: Inner circumference
3c: Top of the main body
3d: Female thread
3e: Main body gas passage
3f: Inner surface of the bottom
3g: bottom
4: Moving member
4a: Head
4b: Shaft
4c: Small diameter part
4d: Large diameter part
5: Compression coil spring (urging member)
6: Gas open passage
7: Fusible plug
8: Porous member
8a: Through hole
9: Closure member
9a: Male thread part
10a, 10b, 10c: O-ring
F: Gas flow during operation of the safety valve of Example 1
F': Gas flow when the safety valve of Example 2 is not activated

Claims (2)

A fusible plug-type safety valve that is attached to a container and releases the gas inside the container when the temperature rises above a specified temperature.
A main body that has a bottomed cylinder and has a main body gas passage that communicates with the inside of the container at the bottom.
A fusible plug body arranged so that one end surface abuts on the inner surface of the lid member that closes the opening of the main body.
A moving member including a head portion that abuts on the other end surface of the fusible plug and slides on the inner peripheral surface of the main body, and a shaft portion that extends from the head to the bottom side and seals the main body gas passage.
A porous member having a through hole that abuts on the bottom surface of the head and penetrates the shaft.
It has an urging member arranged between the inner surface of the bottom of the main body and the surface of the porous member on the bottom side.
The peripheral wall near the bottom of the main body is provided with a gas opening passage that penetrates.
The porous member is a fusible plug type safety valve having a capacity to receive the melted fusible plug. A fusible plug-type safety valve that is attached to a container and closes the gas inside the container when the temperature rises above a specified temperature.
A main body that has a bottomed cylinder and has a main body gas passage that communicates with the inside of the container at the bottom.
A fusible plug body arranged so that one end surface abuts on the inner surface of the lid member that closes the opening of the main body.
A moving member that abuts on the other end surface of the fusible plug, and has a head that is in sliding contact with the inner peripheral surface of the main body and a shaft portion that extends from the head to the bottom side, and the shaft portion is the head portion. It consists of a small diameter portion on the side and a large diameter portion connected to the small diameter portion, and the large diameter portion includes a moving member protruding toward the container side from the main body gas passage.
A porous member having a through hole that abuts on the bottom surface of the head and penetrates the small diameter portion.
It has an urging member arranged between the inner surface of the bottom of the main body and the surface of the porous member on the bottom side.
The peripheral wall near the bottom of the main body is provided with a gas opening passage that penetrates.
The porous member is a fusible plug type safety valve having a capacity to receive the melted fusible plug.

Images