KR200447030Y1 - Thermal-detective operation device including fusible metal, and solid-aerosol automatic extinguisher including the same - Google Patents

Abstract

The present invention provides a heat sensing actuator comprising a fusible metal, and a solid aerosol automatic fire extinguishing apparatus including the same, wherein the heat sensing actuator includes a fusible metal having a deformation of a physical or mechanical structure by heat, and With a fixed ball, elastic means, and ball, it can be operated automatically in the event of a fire. In addition, the automatic fire extinguishing device includes a heat-sensing actuating device and a ignition agent that ignites when a ball is struck by a physical impact caused by the submerged ball, so that the fire is automatically activated in the event of a fire to initially extinguish the fire.

Fusable Metals, Heat Sensing Actuators, Solid Aerosols, Automatic Fire Extinguishers

Description

Thermo-detective operation device including fusible metal, and solid-aerosol automatic extinguisher including the same}

The present invention relates to a thermal sensor and an automatic fire extinguisher, and more particularly, to a heat sensing actuator including a fusible metal, and a solid aerosol automatic fire extinguishing apparatus including the same.

In general, the thermal sensor is used in various fields, for example, reactor temperature detection or fire detection to prevent the reactor from overheating, or an unmanned military weapon system, and effectively detects heat to prevent the failure of the device. Various studies have been conducted to prevent or to make an early evolution of fire.

In addition, in the case of a fire, a fire caused by electricity occupies a substantial portion of the entire fire gun, and a fire occurs frequently due to a short circuit in an electrical outlet, a switch box, a light fixture, or an electronic product. In addition, if a fire occurs in an unattended or uninhabited area, the fire will progress to some extent after the upper time has elapsed since the fire has occurred and the temperature should rise and the smoke and flame should be activated so that a fire detector occurs and the fire extinguishing facility operates. Since it was mature, there were many difficulties in suppression. In particular, most of the fire-extinguishing facilities are installed on the ceiling has a significant distance from the electrical equipment that is the ignition point of the fire, there was a problem that does not detect the fire early or the fire suppression is not properly made. Therefore, various studies have been made on the thermal sensor and the automatic fire extinguishing apparatus to recognize the fire at an early stage to block the spread of the fire and extinguish the fire.

Accordingly, the technical problem of the present invention is to provide a heat sensing operation apparatus capable of effectively detecting heat and recognizing a failure or fire due to overheating of the device at an early stage.

In addition, another technical problem of the present invention is to provide an automatic fire extinguishing device capable of automatically extinguishing a topic at an early stage.

According to an aspect of the present invention, there is provided a heat sensing operating device comprising: a head, a rod connected to the head, a connection between the head and the rod between the head and the rod, and the head and the A concave portion having a width narrower than the width of the rod to form a concave region, and a disk connected to the lower portion of the rod and having a diameter larger than that of the rod, and having a conical shape that is located in the center of the lower surface of the disk and is inverted. A ball including a sink; A sensing unit body including a head insertion unit into which the head of the ball is inserted, and a heat sensing operation space into which a heat sensing operation means for sensing heat is released; A rod insertion unit into which the rod, the disc, and the sinking portion are inserted and connected to a lower portion of the sensing body; And elastic means located in the rod inserting portion, the rod being inserted and applying elastic force to the ball, wherein the heat sensing operation means is located in the heat sensing operation space and melts at a predetermined temperature. And a spherical fixing ball positioned between the fusible metal and the recess and partially inserted into the recess formed by the recess to support the ball.

The sensing body may include a heat conducting plate transferring heat to the fusible metal; A heat conduction plate insertion groove into which the heat conduction plate is inserted and connected to the heat sensing operation space; And a heat conduction plate fixing bolt fastened to fix the heat conduction plate on the heat conduction plate insertion groove.

The thermal conductive plate may include a fusible metal exposure hole formed in the center, and the fusible metal may include a protrusion inserted into the fusible metal exposure hole.

The thermal conductive plate may be made of at least one metal selected from the group consisting of aluminum, copper, iron, silver, gold, platinum, chromium, nickel, and tungsten or an alloy thereof, or stainless steel.

The fusible metal may be lead or an alloy of lead. The fusible metal can be melted at a temperature of 70 ~ 130 ℃.

The heat sensing operating device may further include a sensing coupling part including a thread formed on an outer wall of the lower part of the rod inserting part.

Solid aerosol automatic fire extinguishing device according to the present invention for achieving the above another object is the heat sensing operation device; A fire extinguishing body coupling part having a thread opposite to a thread of the sensing coupling part and coupled to the sensing coupling part; Cylindrical digestive body; An upper plate coupled to an upper edge of the extinguishing body and having a disc shape having an opening formed at a center thereof, wherein the extinguishing body coupling unit is coupled to expose the opening; A release pore network coupled to the lower edge of the digestive body and having at least one aerosol outlet through which an aerosol of the digestive component is released; A primer inserted into an opening of the top plate and igniting when a physical shock is applied by the sinking portion of the ball; An ignition agent positioned in an upper portion of the upper part of the digestive body and overlapping with an opening of the upper plate and ignited by ignition of the primer; A solid extinguishing agent positioned inside the upper portion of the digestive body and in contact with the igniter, which generates an aerosol of the extinguishing component upon combustion; And a coolant positioned inside the lower portion of the digestive body and spaced apart from the solid extinguishing agent.

The extinguishing body may include an outer tube, an inner tube located inside the outer tube, and a side insulation cloth interposed between the outer tube and the inner tube, and the solid aerosol automatic fire extinguishing device is It may further include an upper insulating cloth interposed between the top plate.

The solid extinguishing agent may be a solid mixture including KNO ₃ , KClO _4, and carbon. The coolant may be a solid mixture of at least one material selected from the group comprising Mg (OH) ₂ , Na ₂ CO ₃ , H ₃ BO ₃ , KClO ₄ , KNO ₃ and CaCO ₄ .

According to the heat sensing operation apparatus and the solid aerosol automatic fire extinguishing apparatus including the same according to the present invention, when a fire occurs and the ambient temperature rises, heat is transferred to the fusible metal through the heat conduction plate, and the fusible metal has a constant temperature. It melts and escapes through the fusible metal exposure hole. As a result, the space where the fusible metal was present becomes empty, and the fixed ball which is in contact with the recess moves to the empty space, and the ball is released. When the ball is released, the ball is rapidly elasticated by the elastic force of the elastic means, and the sinking part of the ball descends rapidly and exerts a physical impact on the primer. As a result, the primer ignites as if it exploded, and the ignition agent is ignited by the ignition of the primer. The fire extinguishing agent burns the solid extinguishing agent and generates a solid extinguishing aerosol, so that the fire can be extinguished quickly.

The heat sensing automatic device may also be used in other automatic fire extinguishing system systems (not shown) in addition to the solid aerosol automatic fire extinguishing device illustrated herein. That is, the heat sensing operation device is operated at a predetermined temperature or more, so that the ball falling down can press the fire extinguishing device operating button or the emergency bell which may be provided in another automatic fire extinguishing system. The heat sensing actuation device of the present invention may also be used in unmanned military weapon systems. The thermally sensitive actuating device of the present invention can also be used in a variety of industrial equipment. For example, the heat sensing operation device may be mounted in a semiconductor manufacturing equipment or a reactor, and when the reactor light is overheated above a certain temperature, the heat sensing operation device is operated to press a power cutoff button to heat the reactor light. It can also be prevented.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed subject matter is thorough and complete, and that the spirit of the present invention to those skilled in the art will fully convey.

1 is a top plan view of a heat sensing actuation device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. 1 taken along line II. 3 is an exploded cross-sectional view of FIG. 2.

1 to 3, the heat sensing actuating device 100 according to the present embodiment includes a ball 80. The ball 80 connects the head 82 and the rod 86 between the head 82, the rod 86 connected to the head, the head 82 and the rod 86, and the head A recess 84 having a width narrower than the width of the rod 86 and the rod 86, and a disc connected to the lower portion of the rod 86 and having a diameter larger than that of the rod 86. 87, and a sink 88 located at the center of the lower surface of the disk 87 and having an inverted cone shape.

The head 82 and the recess 84 of the ball 80 is inserted into the sensing body 10, the rod 86 of the ball 80 is the bottom of the sensing body 10 It is inserted into the rod inserting portion 12 coupled to. The sensing unit body 10 has a head insertion unit 30, which is a hole into which the head 82 is inserted, and a heat sensing unit 25 in which heat sensing operation means 25 for detecting heat to release the ball 80 is inserted. It includes an operating space (23). The heat sensing operation means 25 includes a spherical fixed ball 26 and a fusible metal 24. The spherical fixing ball 26 is partially inserted into the concave region formed by the concave portion 84 and serves to fix the ball 80. The fusible metal 24 is located inside the heat sensing operating space 23, and serves to support the fixing ball 26 so that it does not roll when a fire does not occur. The sensing unit body 10 has a heat conduction plate insertion groove 18 connected to the heat sensing operation space 23, and the heat conduction plate insertion groove 18 is in contact with the fusible metal 24 and is fusible. A thermal conductive plate 42 is inserted which serves to fix the metal 24. The fusible metal exposure hole 22 is formed in the thermal conductive plate 42, and the fusible metal 24 may have a shape of a protrusion inserted into the fusible metal exposure hole 22. That is, one side of the fusible metal 24 is recessed to engage the surface of the fixing ball 26, and the other side of the fusible metal 24 is inserted into the fusible metal exposure hole 22. The losing may have protrusions. The sensing unit body 10 further includes a heat conduction plate exposure hole 20 exposing the heat conduction plate 42, and is orthogonal to the heat conduction plate insertion groove 18 at an upper portion of the heat conduction plate exposure hole 20. And the heat conduction plate fixing bolt 28 is fastened to fix the heat conduction plate 42. The heat conduction plate fixing bolt 28 is located in the heat conduction plate fixing bolt groove 27. The thermal conductive plate 42 may be made of at least one metal selected from the group consisting of aluminum, copper, iron, silver, gold, platinum, chromium, nickel, and tungsten, an alloy thereof, or stainless steel. The fusible metal 24 may be made of lead or an alloy of lead, and may be melted at a temperature of 70 to 130 ° C. For example, the fusible metal 24 may be melted at 72 ° C, 93 ° C, 105 ° C, or 124 ° C. When the fusible metal 24 is melted, it may flow out through the fusible metal exposure hole 22 of the heat conductive plate 42. When the fusible metal 24 is melted, the fixing ball 26 is rolled (moved) into the space where the fusible metal 24 was located, thereby releasing the ball 80.

In the rod inserting portion 12, an elastic means 40 into which the rod 86 is inserted is located. The elastic means 40 may be a spring. The elastic means 40 is compressed by the inner jaw of the sensing unit body 10 and the disk 87 of the ball 80, and the fixing ball 26.

Next, the operation of the thermal sensing operation apparatus 100 will be described with reference to FIGS. 2 and 4. 4 is a cross-sectional view illustrating an operating state of the thermal sensing operation device of FIG. 2.

First, before the fire occurs, as shown in Figure 2, the ball 80 is fixed by the fixing ball 26 and the fusible metal 24, the elastic means 40 is the rod inserting portion 12 ) Compressed inside. However, when a fire occurs, as shown in FIG. 4, the temperature of the heat conduction plate 42 exposed by the heat conduction plate exposure hole 20 increases, protruding to the outside of the sensing unit body 10, and Heat is conducted by the heat conduction plate 42 so that the fusible metal 24 melts at a constant temperature, for example, 72 ° C, 93 ° C, 105 ° C, or 124 ° C. The fusible metal 24 melts and flows out of the fusible metal exposure hole 22. As a result, the fixing ball 26 is rolled (moved) into the space where the fusible metal 24 was located, thereby releasing the ball 80. The released ball 80 is rapidly shot down by the elastic force of the elastic means 40, so that the sinking portion 88 of the ball is physically attached to the primer of the automatic fire extinguishing device described later. Impact may cause fire.

Alternatively, although not illustrated herein, an operation button or an emergency bell of various automatic fire extinguishing systems may be pressed. In addition, the thermally sensitive actuating device 100 of the present invention can also be used in unmanned military weapon systems. In addition, the thermally sensitive actuating device 100 of the present invention can be used in a variety of industrial equipment. For example, the heat sensing operation device may be mounted in a semiconductor manufacturing equipment or a reactor, and when the reactor light is overheated above a certain temperature, the heat sensing operation device is operated to press a power cutoff button to heat the reactor light. It can also be prevented.

5 is a cross-sectional view of a solid aerosol automatic fire extinguishing device according to an embodiment of the present invention.

5, the solid aerosol automatic fire extinguishing device 200 according to the present embodiment has a cylindrical digestive body 117. The digestive body 117 is an outer tube 120, an inner tube 116 located inside the outer tube 120, and the side insulation interposed between the outer tube 120 and the inner tube 116. Fabric 118. An upper plate 148 having an opening 149 in the center is coupled to an upper edge of the digestive body 17. The central portion of the upper plate 148 such that the digestive body coupling portion 112 having a thread opposite to that of the sensing coupling portion 14 of the thermal sensing actuating device 100 of FIG. 2 exposes the opening 149. Is coupled to. A primer 110 is inserted into the opening 149 of the upper plate 148.

The initiator container portion 104 is positioned near the center overlapping the opening 149 on the lower surface of the upper plate 148, and the initiator 108 is contained in the initiator container portion 104. The initiator 108 is spaced apart from the primer 110. The bottom surface of the initiator 108 is covered with a initiator container stopper 102. The initiator container portion cap 102 is ruptured by the pressure and heat generated by the initiator 108 in the form of a metal thin film. The initiator container stopper 103 may be made of aluminum or non-ferrous materials.

Inside the upper portion of the digestive body 117, a solid fire extinguishing agent 140 is located. The solid extinguishing agent 140 is burned to generate a solid aerosol of the extinguishing component. An aerosol is referred to as an aerosol when particles in the solid or liquid state are present in the gas. The aerosol of the solid extinguishing component thus means that the solid extinguishing component particles are present in the gas. The solid extinguishing agent 140 may be a solid mixture including KNO ₃ , KClO _4, and carbon. When the solid extinguishing agent 140 is burned, a solid extinguishing aerosol component containing a large amount of potassium (K) is generated. These ingredients are less harmful or harmless to the human body, do not cause significant damage to electronic equipment, are easy to handle residues after digestion, and are more environmentally friendly.

The solid extinguishing agent 140 is manganese dioxide, nickel oxide, copper oxide, iron oxide, surfactant, dibutyl phthalate, dibutyl sebazinat, acethenaglycerin, oleic acid, oleic acid, diamine dioleana lecithin, stearic acid, It may further include at least one selected from the group consisting of epoxide, unsaturated polyester resin, and rubber.

An upper insulation cloth 114 is interposed between the solid extinguishing agent 140 and the upper plate 148. The thermal insulation cloths 114 and 118 prevent the heat of combustion of the solid fire extinguishing agent 140 from being transmitted to the outside of the extinguishing body 117 when the solid fire extinguishing agent 140 is burned, The digestive body 117 serves to prevent delivery to the inside.

The coolant 128 is positioned inside the lower portion of the digestive body 117 so as to be spaced apart from the solid extinguishing agent 140. The coolant 128 may be a solid mixture of at least one material selected from the group comprising Mg (OH) ₂ , Na ₂ CO ₃ , H ₃ BO ₃ , KClO ₄ , KNO ₃ and CaCO ₄ . The coolant 128 may be in the form of, for example, spherical particles as shown in FIG. 5, thereby providing a space for gas to pass between the particles. The coolant 128 serves to cool the heat of combustion of the solid aerosol generated when the solid extinguishing agent 140 is burned.

The lower end of the digestive body 117 is coupled to the air discharge network 132 having at least one aerosol discharge port 134 is a solid aerosol of the extinguishing component is coupled.

A combustion heat separation space 138 is located between the solid extinguishing agent 140 and the coolant 128 in the digestive body 117. Between the combustion heat separation space 138 and the solid fire extinguishing agent 140, a solid fire extinguishing agent air percolation network 122 is located, and between the combustion heat separation space 138 and the coolant 128, a coolant upper perforation network 126 is provided. Located. The coolant upper perforated network 126 and the solid extinguishing drug perforated network 122 is fixed by a separation pipe 124. That is, the combustion heat separation space 138 is defined by the space between the coolant upper perforating network 126 and the solid extinguishing chemical perforating network 122. The coolant lower perforated network 136 is positioned between the coolant 128 and the discharge perforated network 132. Between the coolant lower perforated network 136 and the discharge perforated network 132 is fixed by a lower support pipe (130). At least one hole is drilled in the perforated networks 126, 132, and 136, and the hole does not have a size enough to allow the solid extinguishing agent 140 or the coolant 128 to escape.

In the interior of the upper part of the digestive body 117, the igniter 106 is positioned at a position overlapping with the opening 149 of the upper plate 148 vertically, the igniter 106 is the solid extinguishing agent perforated network In contact with 122 and the solid extinguishing agent 140.

The primer 110, the initiator 108 and the igniter 106 may all be gunpowder, and are highly flammable. Therefore, the primer 110, the initiator 108 and the igniter 106, even if they are spaced apart from each other, if any one of the ignition, it will ignite sequentially from the adjacent one. The primer 110, the initiator 108 and the igniter 106 are at least one selected from the group consisting of potassium nitrate, ammonium nitrate, charcoal, fuel oil, nitrogen oxides, perchlorates, saltpeter and sulfur. It may be a gunpowder composition comprising a.

6 is a cross-sectional view of a solid aerosol automatic fire extinguishing device incorporating a heat sensing actuating device in accordance with one embodiment of the present invention.

Referring to FIG. 6, in the solid aerosol automatic fire extinguishing device 200 according to the present embodiment, the sensing coupling part 14 and the digestive body coupling part 112 of the heat sensing operation device 100 of FIG. 2 are coupled to each other. The heat sensing actuator 100 may be mounted.

7 is a cross-sectional view showing an operating state of the automatic solid aerosol fire extinguishing device according to an embodiment of the present invention.

Referring to FIG. 7, when a fire occurs, the temperature of the heat conduction plate 42 is increased, and heat is conducted by the heat conduction plate 42 so that a constant temperature, for example, 72 ° C. and 93 ° C. The fusible metal 24 melts at, 105 ° C, or 124 ° C. The fusible metal 24 melts and flows out of the fusible metal exposure hole 22. As a result, the fixing ball 26 is rolled (moved) into the space where the fusible metal 24 was located, thereby releasing the ball 80. The released ball 80 is rapidly shot down by the elastic force of the elastic means 40, so that the sinking portion 88 of the ball is a physical impact on the primer 110. As a result, the primer 110 is exploded, and the initiator 102 is exploded by the explosion of the primer 110. As a result, the initiator container portion cap 102 is ruptured by the pressure and heat generated due to the explosion of the initiator 102, and the flame is transferred to the ignition agent 106 along the solid arrow 160 to the foot. The topic 106 is ignited. As the fire extinguishing agent 106 ignites, the solid extinguishing agent 140 is burned, and a solid extinguishing aerosol containing a large amount of potassium (K) is generated. The solid extinguishing aerosol passes through the coolant upper perforated network 126 while moving along the dotted arrow 170, and is cooled while passing through the coolant 128, and the coolant lower perforated network 136 and the discharge perforated network 132 are provided. Is discharged out through. The discharge-injected solid extinguishing aerosol 170 may be extinguished by blocking oxygen in a fire generating area or blocking a chain reaction of fire. This allows the fire extinguishing to be completed early.

1 is a top plan view of a heat sensing actuation device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along line II.

3 is an exploded cross-sectional view of FIG. 2.

4 is a cross-sectional view illustrating an operating state of the thermal sensing operation device of FIG. 2.

5 is a cross-sectional view of a solid aerosol automatic fire extinguishing device according to an embodiment of the present invention.

6 is a cross-sectional view of a solid aerosol automatic fire extinguishing device incorporating a heat sensing actuating device in accordance with one embodiment of the present invention.

7 is a cross-sectional view showing an operating state of the automatic solid aerosol fire extinguishing device according to an embodiment of the present invention.

Claims (16)

A head, a rod connected to the head, a recess connecting the head and the rod between the head and the rod and having a width smaller than the width of the head and the rod to form a concave region, And a ball connected to the lower part of the rod, the disc having a diameter larger than that of the rod, and a sink having a conical shape located in the center of the lower surface of the disc. A sensing unit body including a head insertion unit into which the head of the ball is inserted, and a heat sensing operation space into which a heat sensing operation means for sensing heat is released; A rod insertion unit into which the rod, the disc, and the sinking portion are inserted and connected to a lower portion of the sensing body; And In the heat insertion unit, the heat sensing operation device comprising an elastic means is inserted into the rod and the elastic force to the ball, The heat sensing operation means is located in the heat sensing operation space and is melted at a predetermined temperature, and is located between the fusible metal and the recess and is partially inserted into the recess formed by the recess. And a spherical stationary ball for supporting the ball. The method of claim 1, The sensing unit body, A heat conduction plate transferring heat to the fusible metal; A heat conduction plate insertion groove into which the heat conduction plate is inserted and connected to the heat sensing operation space; And And a heat conduction plate fixing bolt fastened to fix the heat conduction plate on the heat conduction plate insertion groove. The method of claim 2, The thermal conductive plate includes a fusible metal exposure hole formed in the center, And said fusible metal includes a protrusion inserted into said fusible metal exposure hole. The method of claim 2, The thermal conducting plate is made of at least one metal selected from the group consisting of aluminum, copper, iron, silver, gold, platinum, chromium, nickel, and tungsten or an alloy thereof, or stainless steel. Device. The method of claim 1, And said fusible metal is lead or an alloy of lead. The method of claim 5, wherein The fusible metal is heat-sensing operation device, characterized in that melting at a temperature of 70 ~ 130 ℃. The method of claim 1, And a sensing coupling part including a thread formed on an outer wall of the lower part of the rod inserting part. A heat sensing operating device of claim 7; A fire extinguishing body coupling part having a thread opposite to a thread of the sensing coupling part and coupled to the sensing coupling part; Cylindrical digestive body; An upper plate coupled to an upper edge of the extinguishing body and having a disc shape having an opening formed at a center thereof, wherein the extinguishing body coupling unit is coupled to expose the opening; A release pore network coupled to the lower edge of the digestive body and having at least one aerosol discharge port through which an aerosol of the digestive component is released; A primer inserted into an opening of the top plate and igniting when a physical shock is applied by the sinking portion of the ball; An ignition agent positioned in an upper portion of the upper part of the digestive body and overlapping with an opening of the upper plate and ignited by ignition of the primer; A solid extinguishing agent positioned inside the upper portion of the digestive body and in contact with the igniter, which generates an aerosol of the extinguishing component upon combustion; And A solid aerosol automatic fire extinguishing device which is located inside the lower part of the digestive body and comprises a coolant spaced apart from the solid extinguishing agent. The method of claim 8, The digestive body includes an outer tube, an inner tube positioned inside the outer tube, and a side insulation cloth interposed between the outer tube and the inner tube, The solid aerosol automatic fire extinguishing device further comprises a solid aerosol automatic fire extinguishing device which is interposed between the solid extinguishing agent and the top plate. The method of claim 8, The solid extinguishing agent is a solid aerosol automatic fire extinguishing device, characterized in that the solid mixture containing KNO ₃ , KClO ₄ and carbon. The method of claim 8, The coolant is a solid aerosol auto-extinguishing, characterized in that the solid mixture of at least one substance selected from the group comprising Mg (OH) ₂ , Na ₂ CO ₃ , H ₃ BO ₃ , KClO ₄ , KNO ₃ and CaCO ₄ . Device. The method of claim 8, The sensing unit body, A heat conduction plate transferring heat to the fusible metal; A heat conduction plate insertion groove into which the heat conduction plate is inserted and connected to the heat sensing operation space; And And a heat conduction plate fixing bolt fastened to fix the heat conduction plate at an upper portion of the heat conduction plate insertion groove. The method of claim 12, The thermal conductive plate includes a fusible metal exposure hole formed in the center, The fumed metal is a solid aerosol automatic fire extinguishing device comprising a protrusion inserted into the fusible metal exposure hole. The method of claim 12, The heat conduction plate is a solid aerosol automatic, characterized in that made of at least one metal selected from the group consisting of aluminum, copper, iron, silver, gold, platinum, chromium, nickel, and tungsten or an alloy thereof, or stainless steel. Fire Extinguishing System. The method of claim 8, The fusible metal is a solid aerosol automatic fire extinguishing device, characterized in that the lead or lead alloy. The method of claim 15, The fusible metal is solid aerosol automatic fire extinguishing device, characterized in that melting at a temperature of 70 ~ 130 ℃.

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