KR100868070B1 - Pressure Relief Device of Pressurized Devices Using Fusible Alloys - Google Patents

Abstract

The present invention relates to a pressure release device (PRD) of a pressure vessel in which the use of flux can be eliminated by separately filling and filling the soluble alloy and the reinforcing material into the housing, so that no flow occurs during the operation of the soluble alloy.

The present invention includes a first housing having a first and a second inner peripheral portion coupled to the front end portion is in communication with a pressure vessel or a valve or a compressed gas line installed in the pressure vessel and the inner diameter is gradually increased; A second housing having a distal end coupled to a second inner circumference of the first housing so as to communicate with the second inner circumference and having a third inner circumference having the same inner diameter as the first inner circumference; First and second soluble alloy layers filled with a part of the first inner circumference of the first housing and the third inner circumference of the second housing and filled with a soluble alloy in which melting occurs when the ambient temperature reaches an operating temperature; It characterized in that it comprises a reinforcing material layer filled between the first soluble alloy layer and the second soluble alloy layer.

PRD, Gas Cylinder Valve, Fusible Alloy, Stiffener, Separate Fill, Durable

Description

Pressure Relief Device of Pressurized Devices Using Fusible Alloys}

1 is a cross-sectional view showing a pressure release device (PRD) of a conventional pressure vessel,

2A and 2B are cross-sectional views showing a state before and after an operation test for the PRD of FIG. 1, respectively;

3 is a cross-sectional view showing a state in which a valve equipped with a PRD according to the present invention coupled to the gas cylinder,

4 is an exploded cross-sectional view of the PRD according to the present invention shown in FIG.

5A and 5B are front views and a cross-sectional view taken along line AA ′ of FIG. 5A, respectively, of a PRD according to the present invention.

* Explanation of Signs of Major Parts of Drawings *

10: PRD 20: cylinder

30: valve 31: PRD fastening portion

100: first housing 102: first fastener

103a and 103b: first and second inner peripheral portions 105: stepped portions

107: wrench seating portion 200: second housing

202: second fastening portion 203: cylindrical portion

204: Third fastening part 205: Third internal housewife

310: first soluble alloy layer 320: second soluble alloy layer

330: reinforcement layer 400: sealing O-ring

The present invention relates to a pressure releasing device of a pressure vessel using a soluble alloy, and more specifically, it is possible to eliminate the use of flux by separately filling the soluble alloy and the reinforcing material into the housing, so that the flow of the soluble alloy can be eliminated. It relates to a pressure release device (PRD) of the pressure vessel does not occur.

Due to rising oil prices and pollution problems, vehicles using compressed natural gas (CNG) or LPG as fuels of low-cost vehicles are increasing. Such gas vehicles are equipped with gas cylinders filled with natural gas at high pressure in the trunk. However, in gas vehicles, when a gas leaks from a fuel supply line connected to an engine due to a crash of a vehicle, a fire occurs, a gas cylinder filled with compressed gas is exploded when the ambient temperature rises above a certain temperature. A pressure relief device (PRD) is provided as a safety device for quickly discharging the compressed gas filled in the gas cylinder to the outside so as to prevent it.

In other words, the pressure release device (PRD) is a safety device attached to a gas cylinder valve such as an automobile, and when the temperature of the surrounding environment is abnormally increased above a certain temperature due to a fire, etc., the gas inside the cylinder is quickly discharged to the outside. It serves to prevent explosions.

Therefore, a conceptually ideal PRD must completely block the outflow of gas until it reaches a certain temperature, and then release all of the gas within a short time at a certain temperature. Is being used. PRD is a product that is directly related to casualties and therefore must be handled with great care.

In particular, as the utilization of gas and its applications are soaring in each field of the domestic market, the demand for PRD is also high.

PRDs set standards by internationally recognized inspection bodies, countries or national agencies and associations. Although there are some differences between countries, organizations, and associations, the interpretation of the scope to which PRD can be used stably is the same.

For this purpose, for example, in the European standard, the PRD has a melting point of 110 ° C (110 ° C ± 10 ° C) to prepare for safety accidents caused by gas explosions.

Among the CNG parts and performance standards ISO 15500, the standard ISO 15500-13 specifies test items for temperature and pressure conditions and retention times for PRD (Pressure Relief Device) products. Therefore, PRD products can be sold only products that pass the criteria according to the test item.

Conventionally known PRD is a composite alloy filled with a specially developed fusible alloy and a reinforcing agent, which directly supports the gas pressure and then directly supports the composite. Pressure release fuse plugs using a PRD (see US Patent No. 5,419,357) and a composite material developed in US Pat. No. 5,419,357, in which the material leaks to the outside and the used gas leaks through the leak path. Relief Fuse Plug is classified as PRD (see US Patent No. 6,006,774) that indirectly supports the working pressure by using a T-shaped sealing device (Seal T) consisting of a disc-shaped sealing plate and a stem. .

FIG. 1 shows a conventional PRD in which a filled composite material directly supports a gas use pressure and then operates when the composite material directly leaks to the outside and leaks use gas through the leaked path.

As shown in FIG. 1, a conventional PRD (see FIG. 5 of US Pat. No. 6,006,774) 50 is a fusible alloy to a fuse plug 53 mounted at the rear of the pressure vessel 51 through an adapter 55. (57) and Reinforcing Agent (59) mixed with a composite (Composite Alloy) (58) is filled in the cavity of the fuse plug 53 to support the structure to directly support the working pressure. In addition, the fuse plug 53, that is, the inner circumference of the housing is machined in a thread or a specific shape so that the composite material 58 is strongly bonded to the inner circumference when the ambient temperature is normal.

In the conventional PRD 50, when the composite material 58 in which the soluble alloy 57 and the reinforcing material 59 are mixed, only the reinforcing material 59 is mixed with the fusible alloy 57, the wetting becomes wet. Since it is not smooth, it is necessary to use a flux, but the work is not smooth and it is difficult to fill the composite material 58 in the cavity of the fuse plug 53.

However, for the sake of ease of operation, fabrication of PRDs with soluble alloys without mixing reinforcements will not meet the durability test requirements (91 ° C, 325 bar, 500 hours) specified in ISO 15500-13. Therefore, in order to satisfy the durability test requirements, it is required to use a reinforcing material.

In addition, when using the composite material 58 in which the soluble alloy 57 and the reinforcement 59 is mixed as shown in FIG. 1, when a flux agent is mixed for the wetting of the reinforcement 59, a plurality of fine particles as shown in FIG. 2A are used. A cavity (i.e., a cavity) 56 will be present, and many of these fine cavities 56 are available alloys such as 'X' in FIG. 2B when subjected to the durability test defined in ISO 15500-13. 57), causing a flow of morphology changes. That is, the plurality of fine cavities 56 present in the composite material 58 are extinguished by the high pressure of 325 bar from the inside of the pressure vessel 51 for 500 hours at the test temperature of 91 ° C., and the rear end of the soluble alloy 57. The addition will result in a finer flow which, in turn, leads to difficulties in the production of PRD products that meet the above specifications.

Moreover, the soluble alloy reacts to temperature, and the reinforcing material mixed in the soluble alloy is also transferred to the fine motion of the soluble alloy. This is because the use environment in which the PRD is used is a high pressure, such minute movement may cause a malfunction of the PRD.

Therefore, the present invention has been made in order to solve the above problems, the object of the present invention is to eliminate the use of the flux by separately filling the soluble alloy and reinforcement in the housing so that the flow does not occur during operation of the soluble alloy To provide a pressure relief device (PRD) of a pressure vessel.

Another object of the present invention is that the structure of the entire housing consists of two first and second housings can easily separate and fill the reinforcing material in the middle of the soluble alloy, and the amount of filling of the reinforcing material and the soluble alloy at the same time to consider the improvement of assembly The present invention provides a pressure release device for pressure vessels capable of maintaining a constant height and height to achieve uniformity in quality.

Still another object of the present invention is to eliminate the development of composite materials by adopting a structure for separating and filling the soluble alloy and the reinforcing material, and only the soluble alloy in a predetermined use temperature range can be developed more easily than the development of the composite material. The present invention provides a pressure relief device for a pressure vessel.

According to the present invention for achieving the above object, the present invention is a first end coupled to the pressure vessel or a valve or a compressed gas line installed in the pressure vessel and the first having a first and second inner peripheral portion having a stepped inner diameter in steps A housing; A second housing having a distal end coupled to a second inner circumference of the first housing so as to communicate with the second inner circumference and having a third inner circumference having the same inner diameter as the first inner circumference; First and second soluble alloy layers filled with a part of the first inner circumference of the first housing and the third inner circumference of the second housing and filled with a soluble alloy in which melting occurs when the ambient temperature reaches an operating temperature; Provided is a pressure releasing device using a soluble alloy, characterized in that consisting of a reinforcing material layer filled between the first soluble alloy layer and the second soluble alloy layer.

The rear end of the first housing is preferably made of a polygonal outer periphery so as to facilitate installation using an assembly tool such as a pressure vessel.

In addition, it is preferable that the first and third inner peripheral portions of the first and second housings have an uneven structure or a nonslipping surface.

According to another feature of the invention, the present invention includes a housing having an inner circumference coupled to the front end portion of the pressure vessel or a valve or compressed gas line installed in the pressure vessel; First and second soluble alloy layers each filled with an inner circumferential front end and a rear end of the housing and filled with a soluble alloy in which melting occurs when the ambient temperature reaches an operating temperature; It provides a pressure releasing device using a soluble alloy, characterized in that consisting of a reinforcing material layer filled between the first soluble alloy layer and the second soluble alloy layer.

The housing includes: a first housing having first and second inner circumference portions of which the inner diameter thereof is increased in stages so that the tip portion communicates with a pressure vessel or a valve or a compressed gas line installed in the pressure vessel; Preferably, the distal end portion is coupled to the second inner circumference of the first housing so as to communicate with the second inner circumference, and the second housing includes a third inner circumference having the same inner diameter as the first inner circumference.

In this case, the soluble alloy forming the soluble alloy layer may be a ternary alloy made of Bi-PB-Sn or Bi-Cd-Sn or a ternary system made of Pb-Bi-Sn-In, and the like. Any known material can be used as long as the melting takes place at a predetermined operating temperature, for example 110 ° C.

In addition, the reinforcement agent (Reinforced Agent) is, for example, a spherical ball (ball), a cube, a round bar, a plate-shaped chip made of a material such as steel (Ni), Cr, Cu, Ti, stainless steel, etc. , A small piece of metal having the shape of a fiber (fiber) may be used, and preferably coated with a bondable material such as Ni, Cu, Sn, Pb, Zn on its outer surface, It is preferable to have a size of 0.6 to 0.9mm.

In this case, when the size of the reinforcement is less than 0.6mm, the workability decreases and the material cost increases significantly. On the contrary, when the size of the reinforcement exceeds 0.9mm, the flow between the filled reinforcement and the reinforcement is the same as that of the cavity. It causes a problem.

In addition, the soluble alloy and the reinforcing material to be filled in the inner peripheral portion of the housing is set to 75:25 to 85:15 by volume ratio, preferably 80:20. If the reinforcement is contained in more than 25% by volume, there is a problem that can not withstand 500 hours of the durability test requirements, and when the reinforcement is contained in less than 15% by volume, the operation is not within the standard operating time of the operation test requirements There is a problem that can not be achieved, the dangerous situation that the container explodes. Therefore, in the present invention, the mixing ratio of the soluble alloy and the reinforcing material to be filled in the inner circumference of the first and second housing is set to 75:25 to 85:15 by volume ratio.

In this case, it is also possible to change the length and width of the soluble alloy layer and the stiffener layer if the ratio of the soluble alloy to the stiffener is appropriate within the above set range.

(Example)

Referring to the accompanying drawings, a pressure relief apparatus for a pressure vessel using a soluble alloy according to the present invention will be described in detail.

3 is a cross-sectional view showing a valve equipped with a PRD and a cylinder equipped with a valve according to the present invention, FIG. 4 is an exploded cross-sectional view of the PRD according to the present invention shown in FIG. 3, and FIGS. 5A and 5B are respectively shown. Front and longitudinal cross-sectional views of a PRD according to the invention.

First, as shown in FIGS. 3 to 5B, the PRD 10 according to the present invention may be, for example, a gas cylinder (or pressure vessel) filled with compressed natural gas (CNG) to supply fuel to a vehicle ( Pressure vessels that are installed directly at 20) or integrally or coupled to the valve 30 coupled to the head of the cylinder, or have a compressed gas therein, causing the surrounding environment to rise above the preset temperature due to fire, etc. All may apply. In addition, the PRD 10 may be installed in a fuel supply line of a vehicle (not shown).

PRD (10) according to the present invention is largely screwed together and the first and second housings (100,200) and the inner circumference is communicated with the same diameter, and the first filled in the inner peripheral end of the first housing (100) The soluble alloy layer 310, the second soluble alloy layer 320 filled in the inner circumference of the second housing 200, the first soluble alloy layer 310 and the second housing of the first housing 100. It consists of a reinforcing material layer 330 filled between the second soluble alloy layer 320 of (200).

In the PRD 10 of the present invention, the reinforcement layer 330 is disposed between the first soluble alloy layer 310 and the second soluble alloy layer 320. In this arrangement structure, the reinforcement layer 330 is effectively filled in the housing. The first and second housings (100,200) are screwed to each other to be implemented, and the coupling portion of the first and second housings (100,200) to seal the inner circumference to maintain the sealing state O-ring 400 Is inserted.

The first and second soluble alloy layers 310 and 320 are filled with soluble alloy in the inner circumferences of the first and second housings 100 and 200, respectively, and when the temperature reaches a preset temperature, the melting occurs when the temperature is reached. Due to the pressure of the reinforcement of the reinforcement layer 330 and the start of the first and second housings (100, 200) is made to start to discharge the compressed gas filled in the pressure vessel (20).

In this case, the soluble alloy may be, for example, a tetravalent soluble alloy of Pb-Bi-Sn-In, or Bi-Pb-Sn or Bi-Cd-Sn, proposed by the applicant in the patent application No. 2006-4429. Any known alloy may be applied as long as it is a soluble alloy which can be melted when a predetermined temperature is reached including the same ternary soluble alloy.

The soluble alloy can be any known material as long as it is melted at an operating temperature specified in various standards, for example, 110 ° C. The soluble alloy employed in the present invention is an alloy in which melting is performed at a predetermined temperature, and the soluble alloy may be a ternary alloy or a ternary alloy.

Known ternary soluble alloys include Bi-PB-Sn or Bi-Cd-Sn based alloys, and ternary soluble alloys are proposed by the present applicant in patent application No. 2006-104429 (October 26, 2006). In the same wt%, a soluble alloy of Bi: 29.0 to 33.0, Sn: 14.0 to 21.0, In: 2.0 to 5.0, and the balance substantially of Pb may be used.

In addition, the reinforcement agent (Reinforced Agent) is, for example, a spherical ball (ball), a cube, a round bar, a plate-shaped chip made of a material such as steel (Ni), Cr, Cu, Ti, stainless steel, etc. , A small piece of metal having the shape of a fiber (fiber) may be used, and preferably coated with a bondable material such as Ni, Cu, Sn, Pb, Zn on its outer surface, For example, it has a size of 0.6 to 0.9 mm.

Hereinafter, each component will be described in more detail with reference to FIGS. 3 to 5B.

First, the first housing 100 has a male thread formed at a tip of an outer circumference thereof, and the first fastening part 102 screwed to the PRD fastening part 31 of the valve 30 mounted on the gas cylinder 20. When the first housing 100 is screwed to the PRD fastening part 31 of the valve 30 at the rear end of the first fastening part 102, a polygonal shape, for example, has a hexagonal shape to facilitate tightening with a predetermined torque. Wrench seating portion 107 is included.

In addition, the first housing 100 has first and second inner circumferential portions 103a and 103b having first and second inner diameters which are gradually increased through the stepped portion 105, and the first inner circumferential portion ( The first soluble alloy layer 310 in which the soluble alloy is filled is formed at the front end portion 103a, and the reinforcing material layer 330 is formed at the rear end of the first soluble alloy layer 310.

The first inner circumferential portion 103a of the first housing 100 has a stronger coupling with the joint surface when the first soluble alloy layer 310 and the reinforcement 330 formed therein are in the normal temperature range. The uneven structure or nonslipping surface, for example, a thread is formed, and the second housing 200 is formed in the second inner circumferential portion 103b disposed inside the wrench seating portion 107. A female thread is formed so that the tip of the screw is screwed together.

In addition, a sealing packing may be added to the front end of the first housing 100 so that the sealing is made when the first fastening part 102 is screwed to the PRD fastening part 31 of the valve 30. In this case, preferably, an annular groove is formed on the exposed surface of the sealing packing, and an annular protrusion is formed on the inner surface of the PRD fastening portion 31 of the valve 30 in contact with the sealing packing. It is also possible to make a seal.

On the other hand, the second housing 200 has a male screw thread formed in the outer peripheral portion of the tip, the second fastening portion 202 is screwed to the second inner peripheral portion 103b of the first housing 100, and the second fastening portion 202 Cylindrical portion 203 including a gripping surface 203a gripped by a fixing tool when screwing the second housing 200 to the second inner circumferential portion 103b of the first housing 100 at the rear end thereof. And a third fastening portion 204 for screwing a distal end portion of a vent line, not shown in the outer circumferential portion, to the rear end portion.

In addition, the second housing 200 is set so that the third inner peripheral portion 205 formed therein has the same inner diameter as the first inner diameter of the first inner peripheral portion 103a and reaches a set temperature so that the soluble alloy melts. When it is possible to be discharged to the outside quickly with the reinforcement, and the third inner circumferential portion 205 is bonded to the soluble alloy of the second soluble alloy layer 320 is filled therein when the ambient temperature is in the normal temperature range Uneven structures or non-slipping surfaces, such as threads, are formed except for the inner end of the inner side so that stronger bonding can be achieved with the surface. The uneven structure or non-slipping surface is not formed at the inner circumferential rear end portion of the third inner circumferential portion 205, when the soluble alloy has already reached the set temperature and the soluble alloy is melted. It is intended to be discharged to the outside.

The length of the first inner circumferential portion 103a of the first housing 100 is set to be relatively shorter than the length of the third inner circumferential portion 205 of the second housing 200, so that the second fusible layer 320 is first available. Filling in a larger amount longer than the alloy layer 310 is preferable in terms of durability.

In the present invention, in order to form the first and second soluble alloy layers 310 and 320 on the inner circumference of the first and second housings 100 and 200, the first and second housings 100 and 200 may be formed. After filling the inner peripheral part by a predetermined amount and filling, cooling is performed.

For example, the formation of the first soluble alloy layer 310 with respect to the first housing 100 may be performed by filling a molten soluble alloy by measuring a predetermined amount with a scale while the first housing 100 is inverted. By adjusting the height of the soluble alloy filled by the end mill operation in the set state to ensure a constant space to be filled with the reinforcing material.

In addition, the formation of the second soluble alloy layer 320 for the second housing 200 is to form a molten soluble alloy in the state in which the filling amount adjusting jig is inserted into the lower end of the second housing 200 of the second housing 200. Filling and finishing to match the tip, it is very easy to process the top surface of the second available alloy layer 320 can be made very easily, it is possible to constantly adjust the amount of the available alloy constant.

Thereafter, the rear end of the first inner circumferential portion 103a of the first housing 100 and the second inner circumferential portion 103b are filled with a reinforcing material in a predetermined amount, and the sealing O-ring 400 is filled with the second inner circumferential portion. When the second fastening part 202 of the second housing 200 is screwed into the second inner circumferential part 103b while being inserted into the 103b, the filling ratio of the soluble alloy and the reinforcing material is 80:20 in volume ratio. This is done.

The operation of the PRD according to the present invention will be described below.

The PRD 10 according to the present invention is assembled according to the assembling process, and then a gas cylinder (or pressure vessel) 20 is provided with a sealing packing interposed at the distal end of the PRD 10 assembled using the assembling tool. The installation is completed by tightening to a predetermined torque to the valve 30 coupled to the head of the).

When the compressed gas is filled in the gas cylinder 20 with the PRD 10 mounted on the valve 30 coupled to the head of the gas cylinder (or pressure vessel) 20 as described above, the pressure of the compressed gas The upper surface of the first soluble alloy layer 310 is subjected to a high pressure, but a malfunction does not occur.

For example, even when the durability test specified in ISO 15500-13 is carried out, in the present invention, the first soluble alloy layer is sequentially formed on the first and third inner peripheral parts 103a and 205 of the first and second housings 100 and 200. Since the 310, the reinforcing material layer 330 and the second soluble alloy layer 320 is separately charged, the filling can be easily made, and since there is no cavity (bubble) because it does not use a separate flux material as in the prior art, Therefore, the shape change due to the flow of the soluble alloy does not occur.

In addition, in the present invention, since the entire housing is designed as a screw coupling structure of the first and second housings 100 and 200, the first soluble alloy layer 310, the reinforcing material layer 330, and the second soluble alloy layer are formed in the inner space of the housing. It is possible to effectively separate and charge the 320.

 Meanwhile, in the PRD 10 of the present invention, when the ambient temperature reaches a set temperature (eg, 110 ° C.) due to a collision of a vehicle, the available alloys of the first and second soluble alloy layers 310 and 320 are melted. The soluble alloy and the reinforcing material melted by the pressure of the compressed gas are discharged while being pushed out of the second housing 200, and thus the compressed gas filled in the cylinder 20 is discharged in the first and second housings 100 and 200. The molten soluble alloy and reinforcement are discharged to the outside through the vent line (not shown) coupled to the third fastening portion 204.

The PRD of the present invention described above is operated at 110 ° C by using a 110 ° C soluble alloy, but can be changed in such a way as to change the available soluble alloy according to the change in operating temperature.

Experimental Example

PRD according to the embodiment of the present invention was assembled by setting the filling ratio of the soluble alloy and the reinforcing material to the inner peripheral portion of the first second housing set to 80:20 by volume ratio, Comparative Example 1 in the same housing structure to the reinforcement in the volume ratio It was assembled by setting to 73:27 to include more than 25%, in Comparative Example 2 was assembled by setting to 88:12 to include less than 15% by volume ratio. In this case, 0.7 mm steel balls were used for the reinforcing materials of Examples, Comparative Examples 1 and 2 of the present invention.

Thereafter, the PRDs of Examples, Comparative Examples 1 and 2 of the present invention were subjected to durability tests and activation tests, respectively, and the test results are shown in Table 1 below.

Durability test conditions are 91 ℃, 325 bar, 500 hours, operating test conditions are 600 ㅁ 10 ℃, 62.5 bar, the measurement time is in danger of exploding the container if the operation is not performed for more than 5 minutes in the above conditions Therefore, as a rule of thumb, 2 minutes ㅁ 30 seconds was set as the criterion of acceptance. In this case, the temperature condition of the operation test is the ambient temperature of the PRD.

Durability test Operation test Inventive Example Pass (500 hours) Pass (1 minute 55 seconds) Comparative Example 1 Failed (414 hour operation) Pass (1 minute 54 seconds) Comparative Example 2 pass Failed (4 minutes 24 seconds)

As can be seen from the test results, when the content of the reinforcement exceeds 25% by volume, the operation test is satisfied, but the durability test requirements are not satisfied (Comparative Example 1). On the contrary, the content of the reinforcement is less than 15% by volume. In this case, the durability test is satisfied but the operation test requirement is not satisfied (Comparative Example 2). However, in the embodiment of the present invention endured the durability test conditions 500 hours, it was confirmed that the operation is performed in 1 minute 55 seconds in the operation test.

In the above description of the preferred embodiment, the structure of the housing is separated into two for the effective separation and filling of the soluble alloy and the reinforcing material, for example, the present invention is not limited to this can be implemented using a single housing.

As described above, the PRD of the present invention can eliminate the use of flux by separately filling and filling the soluble alloy and the reinforcing material into the housing so that no flow is generated during the operation of the soluble alloy.

In addition, in the present invention, the structure of the entire housing is composed of two first and second housings, so that the reinforcement can be easily separated and filled in the middle of the soluble alloy, the assembly can be maintained, and the filling amount of the reinforcement and the soluble alloy at the same time. The height and height can be managed constantly, resulting in uniformity of quality.

Further, in the present invention, by adopting a structure for separating and filling the soluble alloy and the reinforcing material, it is not necessary to develop a composite material, and only a soluble alloy having a preset use temperature range can be developed more easily than the development of the composite material.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

Claims (8)

A first housing having a first end and a second inner circumference coupled to the front end thereof in communication with a pressure vessel or a valve or a compressed gas line installed in the pressure vessel, the inner diameter of which is increased in stages; A second housing having a distal end coupled to a second inner circumference of the first housing so as to communicate with the second inner circumference and having a third inner circumference having the same inner diameter as the first inner circumference; First and second soluble alloy layers filled with a part of the first inner circumference of the first housing and the third inner circumference of the second housing and filled with a soluble alloy in which melting occurs when the ambient temperature reaches an operating temperature; Pressure releasing device using a soluble alloy, characterized in that the filler is filled between the first soluble alloy layer and the second soluble alloy layer consisting of a plurality of particulate reinforcement material. delete delete The pressure release device using a soluble alloy according to claim 1, wherein the rear end of the first housing has a polygonal outer circumference. The pressure release device using a soluble alloy according to claim 1, wherein the first and third inner circumferential portions of the first and second housings have an uneven structure or a nonslipping surface. The pressure releasing device using a soluble alloy according to claim 1 or 5, wherein the soluble alloy and the reinforcing material are set in a volume ratio of 75:25 to 85:15. 7. The pressure releasing device using soluble alloy according to claim 6, wherein the size of the reinforcing material is set in a range of 0.6 to 0.9 mm. The pressure release device according to claim 1, wherein the length of the first inner circumference of the first housing is set to be relatively shorter than the length of the third inner circumference of the second housing.

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