CN112972969B - High-fire-resistance aluminum alloy die casting for security and protection monitor - Google Patents
High-fire-resistance aluminum alloy die casting for security and protection monitor Download PDFInfo
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- CN112972969B CN112972969B CN202110290003.3A CN202110290003A CN112972969B CN 112972969 B CN112972969 B CN 112972969B CN 202110290003 A CN202110290003 A CN 202110290003A CN 112972969 B CN112972969 B CN 112972969B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/02—Permanently-installed equipment with containers for delivering the extinguishing substance
- A62C35/10—Containers destroyed or opened by flames or heat
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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Abstract
The invention discloses a high-fire-resistance aluminum alloy die casting for a security monitor, which belongs to the field of security monitoring, and comprises a monitoring equipment body, wherein the monitoring equipment body comprises an equipment shell, a plurality of spherical cavities which are arranged at equal intervals and are provided with openings are arranged on the side wall of the equipment shell positioned outside, a flame retardant device is creatively added into the aluminum alloy die casting to prevent flame from invading the monitor, the working time of the monitor is prolonged to a certain extent, and valuable fire scene internal monitoring pictures are provided as much as possible for firemen, so that the time of rescue work is strived, the loss of property and life is effectively reduced, the solid thermal expansion ball is enlarged by utilizing the high temperature during flame combustion, a thimble breaks a plugging film to release lime powder, and a large amount of heat is released by utilizing the reaction of the lime powder and water to expand the hollow thermal expansion ball to be enlarged, thereby expelling the liquid flame retardant to prevent flame phagocytosis of the device housing.
Description
Technical Field
The invention relates to the field of security monitoring, in particular to a high-fire-resistance aluminum alloy die casting for a security monitor.
Background
Security can be understood as an acronym for "security protection". According to the explanation of the present Chinese dictionary, the safety is no danger, no harm and no accident; prevention refers to defense, i.e., arming, which refers to preparing to cope with an attack or avoid a victim, and arming, which refers to arming and protecting. In view of the above explanation, the following definitions can be given for security precautions: the method is ready and protected to cope with attacks or avoid victims, so that the protected object is in a safe state without danger, invasion and accidents. Obviously, safety is the purpose, and prevention is the means, reaches or realizes the purpose of safety through the means of prevention, is exactly the basic connotation of safety precaution.
The shell of the monitor for security monitoring is generally made of aluminum alloy by die casting, belongs to a light die casting piece, and because metal copper, zinc, aluminum and aluminum alloy have good fluidity and plasticity and the casting process is casting in a pressure die casting machine, the aluminum die casting piece can be made into various complicated shapes and also can be made into high precision and finish degree, thereby reducing the machining amount of the casting piece and the casting allowance of the metal copper, zinc, aluminum or aluminum alloy to a great extent, saving electric power and metal materials and also greatly saving labor cost; copper, zinc, aluminum and aluminum alloys have excellent thermal conductivity, small specific gravity and high workability; therefore, the die casting is widely applied to various industries such as automobile manufacturing, internal combustion engine production, motorcycle manufacturing, motor manufacturing, oil pump manufacturing, transmission machinery manufacturing, precision instruments, landscaping, electric power construction, building decoration and the like.
The operational environment of security protection watch-dog is relatively stable on average, but also receives when threatening, for example when the conflagration takes place, current aluminum alloy watch-dog shell all does not have fire resistance, in case receive the phagocytosis of flame can burn the meltdown at once, leads to the fire fighter can't look over the inside out of control condition in scene of a fire, and then brings certain resistance for rescue work, has enlarged economic property loss, threatens people's life even.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a high-fire-resistance aluminum alloy die casting for a security monitor, and the scheme creatively adds a flame retardant device in the aluminum alloy die casting to prevent flame from invading the monitor, prolongs the working time of the monitor to a certain extent, provides fire scene internal monitoring pictures for firefighters as much as possible, thereby striving for precious time for rescue work, effectively reducing property and life loss, and utilizes the high temperature of flame during combustion to enlarge a solid thermal expansion ball, so that a thimble breaks a sealing film to release lime powder, and utilizes the reaction of the lime powder and water to release a large amount of heat to enlarge a hollow thermal expansion ball, thereby extruding a liquid flame retardant to prevent flame from phagocytosing an equipment shell, and effectively prolonging the working time of the monitor.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A high-fire-resistance aluminum alloy die casting for a security monitor comprises a monitoring equipment body, wherein the monitoring equipment body comprises an equipment shell, a plurality of spherical cavities which are arranged at equal intervals and provided with openings are formed in the side wall of the equipment shell, a combustible sealing block is filled at the opening of each spherical cavity, a hollow thermal expansion ball is placed in each spherical cavity, a liquid fire retardant is filled between each hollow thermal expansion ball and the inner wall of each spherical cavity, water is filled in each hollow thermal expansion ball, a heat conducting rod is inserted in each sealing block, one end, far away from each sealing block, of each heat conducting rod penetrates into each hollow thermal expansion ball, a material ball is fixedly sleeved at one end, located inside each hollow thermal expansion ball, of each heat conducting rod, is of a hollow structure, and a solid thermal expansion ball is fixedly connected at one end, located inside each material ball, of each heat conducting rod, the side wall of the lower end of the solid thermal expansion ball is fixedly connected with a vertically arranged thimble, lime powder is filled in the material ball, the side wall of the lower end of the material ball is provided with a discharge hole, a plugging film is fixedly connected in the discharge hole and is positioned under the thimble, the scheme creatively adds a flame retardant device in the aluminum alloy die casting to prevent flame from invading a monitor, prolongs the working time of the monitor to a certain extent, provides fire fighters with monitoring pictures in the fire scene as much as possible, thereby striving for precious time for rescue work, effectively reduces the loss of property and life, utilizes the high temperature during flame combustion to enlarge the solid thermal expansion ball, thereby the thimble breaks the plugging film to release the lime powder, utilizes the lime powder to react with water to release a large amount of heat to enlarge the expansion of the hollow thermal expansion ball, thereby extruding the liquid flame retardant to prevent the flame from engulping the equipment shell, effectively prolongs the working time of the monitor.
Furthermore, the hollow thermal expansion ball and the solid thermal expansion ball are both made of thermal expansion materials with high expansion rates, so that the liquid flame retardant can be extruded out as much as possible by the expansion of the hollow thermal expansion ball, and the thimble can be punctured by the expansion of the solid thermal expansion ball.
Furthermore, the liquid flame retardant is filled with flame-retardant balls, the filling amount of the flame-retardant balls is 20% -30%, and the diameter of the flame-retardant balls is smaller than the width of the opening of the spherical cavity, so that the problem that the rear liquid flame retardant cannot flow out due to the fact that the opening of the spherical cavity is blocked by excessive flame-retardant balls is solved.
Furthermore, the flame-retardant ball is made of a high-water-absorption resin material, the flame-retardant ball is hollow, water is filled in the hollow, and the flame-retardant ball can desorb water at high temperature, so that a certain flame-retardant effect is achieved, the dehydration time of the flame-retardant ball can be prolonged by the water in the flame-retardant ball, and the flame-retardant time of the flame-retardant ball is effectively prolonged.
Further, the inner wall of equipment shell is fixed to be inlayed and is had a plurality of heat absorption seal wires, and the heat absorption seal wire is located the half ball on the right side of hollow thermal expansion ball and distributes, and is a plurality of the heat absorption seal wire all runs through to the inside of hollow thermal expansion ball and extends to the aquatic, because the inside heat that also can produce of supervisory equipment body during operation, equipment shell itself is owing to adopted aluminum alloy material, consequently has the radiating effect, and the heat of while heat absorption seal wire leads the inside aquatic of hollow thermal expansion ball of equipment shell, plays certain radiating effect, effectively improves equipment shell heat dispersion.
Furthermore, the heat absorption guide wire consists of a heat conduction wire and a heat dissipation ball, the heat dissipation ball is located below the water surface, the heat dissipation ball increases the heat exchange area, and the heat dissipation effect is effectively improved.
Furthermore, the filling amount of the lime powder in the material ball is 70-80%, so that a sufficient variable space is reserved for the expansion of the solid thermal expansion ball, the expansion is not hindered, and the thimble can smoothly puncture the plugging film.
Further, the material ball is arranged above the water surface inside the hollow thermal expansion ball, so that water is prevented from entering the material ball to react with the lime powder, heat is prevented from entering the hollow thermal expansion ball, and the filling amount of the water in the hollow thermal expansion ball and the filling amount of the lime powder are added according to a fully-reacted ratio.
Furthermore, nitrogen is filled in the hollow thermal expansion ball, the filling amount of the nitrogen is half of the internal volume of the hollow thermal expansion ball, and the nitrogen expands when being heated, so that the expansion effect of the hollow thermal expansion ball can be enhanced, and the liquid flame retardant can be extruded out as much as possible.
Furthermore, the plugging film is made of hard and easily-broken materials, so that when the solid thermal expansion ball expands, the downward moving thimble can easily burst the plugging film.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme creatively adds the flame retardant device in the aluminum alloy die casting to prevent flame from invading the monitor, prolongs the working time of the monitor to a certain extent, provides fire scene internal monitoring pictures for fire fighters as much as possible, thereby striving for precious time for rescue work, effectively reducing property and life loss, and utilizes the high temperature during flame combustion to enlarge the solid thermal expansion ball (7), thereby leading the thimble (8) to burst the plugging film (601) to release lime powder, utilizing the reaction of the lime powder and water to release a large amount of heat to expand the hollow thermal expansion ball (2) to enlarge, thereby extruding the liquid flame retardant (4) to prevent flame from phagocytosing the equipment shell (101), and effectively prolonging the working time of the monitor.
(2) The hollow thermal expansion ball and the solid thermal expansion ball are made of thermal expansion materials with high expansion rates, so that the liquid flame retardant can be extruded out as much as possible by the expansion of the hollow thermal expansion ball, and the thimble can be punctured by the expansion of the solid thermal expansion ball.
(3) The liquid flame retardant is filled with the flame-retardant balls, the filling amount of the flame-retardant balls is 20-30%, and the diameter of the flame-retardant balls is smaller than the width of the opening of the spherical cavity, so that the problem that the rear liquid flame retardant cannot flow out due to the fact that the opening of the spherical cavity is blocked by the excessive flame-retardant balls is solved.
(4) The flame-retardant ball is made of a high-water-absorption resin material, the flame-retardant ball is hollow, water is filled in the hollow, and the flame-retardant ball can desorb water at high temperature, so that a certain flame-retardant effect is achieved, the dehydration time of the flame-retardant ball can be prolonged by the water in the flame-retardant ball, and the flame-retardant time of the flame-retardant ball is effectively prolonged.
(5) The inner wall of equipment shell is fixed to be inlayed and is had a plurality of heat absorption seal wires, and the heat absorption seal wire is located the right hemisphere distribution of hollow thermal expansion ball, a plurality of heat absorption seal wires all run through to the inside of hollow thermal expansion ball and extend to aquatic, because the inside heat that also can produce of supervisory equipment body during operation, equipment shell itself is owing to adopted aluminum alloy material, consequently, there is the radiating effect, the heat guide wire leads the inside aquatic of hollow thermal expansion ball of equipment shell with the heat of equipment shell simultaneously, play certain radiating effect, effectively improve equipment shell heat dispersion.
(6) The heat absorption guide wire consists of heat conduction wires and a heat dissipation ball, the heat dissipation ball is located below the water surface, the heat dissipation ball increases the heat exchange area, and the heat dissipation effect is effectively improved.
(7) The filling amount of the lime powder in the material ball is 70-80%, so that enough variable space is reserved for the expansion of the solid thermal expansion ball, the expansion is not hindered, and the thimble can smoothly puncture the plugging film.
(8) The material ball is arranged higher than the water surface in the hollow thermal expansion ball, so that water is prevented from entering the material ball to react with the lime powder, heat is prevented from entering the hollow thermal expansion ball, and the filling amount of the water in the hollow thermal expansion ball and the filling amount of the lime powder are added according to a fully-reacted ratio.
(9) The hollow thermal expansion ball is filled with nitrogen, the filling amount of the nitrogen is half of the internal volume of the hollow thermal expansion ball, and the nitrogen expands when being heated, so that the expansion effect of the hollow thermal expansion ball can be enhanced, and the liquid flame retardant can be extruded out as much as possible.
(10) The plugging film is made of hard and easily-broken materials, so that when the solid thermal expansion ball expands, the downward moving thimble can easily burst the plugging film.
Drawings
FIG. 1 is a schematic perspective view of a monitoring device body according to the present invention;
FIG. 2 is a schematic cross-sectional view of the device housing of the present invention;
FIG. 3 is a schematic view of a partial cross-sectional structure of an apparatus housing according to the present invention;
FIG. 4 is a diagram of a solid thermal expansion ball of the present invention before expansion;
FIG. 5 is a diagram of a solid thermal expansion ball of the present invention after expansion;
fig. 6 is a schematic cross-sectional structure view of the flame-retardant ball of the present invention.
The reference numbers in the figures illustrate:
the device comprises a monitoring device body 1, a device shell 101, a hollow thermal expansion ball 2, a sealing block 3, a liquid flame retardant 4, a heat conducting rod 5, a material ball 6, a sealing film 601, a solid thermal expansion ball 7, an ejector pin 8, a flame retardant ball 9 and a heat absorption guide wire 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
referring to fig. 1-6, a high fire resistance aluminum alloy die casting for a security monitor, referring to fig. 1-2, includes a monitoring device body 1, the monitoring device body 1 includes a device housing 101, a plurality of spherical cavities with openings are disposed on the side wall of the device housing 101, the spherical cavities are disposed at equal intervals, a plurality of heat absorbing guide wires 10 are fixed and embedded on the inner wall of the device housing 101, the heat absorbing guide wires 10 are composed of heat conducting wires and heat dissipating balls, the heat dissipating balls are disposed below the water surface, the heat dissipating balls increase the heat exchange area, the heat dissipating effect is effectively improved, the heat absorbing guide wires 10 are disposed on the right hemisphere of the hollow thermal expansion ball 2, the plurality of heat absorbing guide wires 10 penetrate through the hollow thermal expansion ball 2 and extend into the water, the monitoring device body 1 generates heat when working, the device housing 101 itself is made of aluminum alloy material, so that the heat dissipating effect is achieved, meanwhile, the heat absorption guide wire 10 guides the heat of the equipment shell 101 to the water in the hollow thermal expansion ball 2, so that a certain heat dissipation effect is achieved, and the heat dissipation performance of the equipment shell 101 is effectively improved;
referring to fig. 6, the opening of the spherical cavity is filled with a combustible sealing block 3, a hollow thermal expansion ball 2 is placed in the spherical cavity, and a liquid flame retardant 4 is filled between the hollow thermal expansion ball 2 and the inner wall of the spherical cavity, a flame-retardant ball 9 is filled in the liquid flame retardant 4, the filling amount of the flame-retardant ball 9 is 20-30%, the diameter of the flame-retardant ball 9 is smaller than the width of the opening of the spherical cavity, in order to prevent the excessive fire-retardant balls 9 from blocking the opening of the spherical cavity and preventing the liquid fire retardant 4 from flowing out, the fire-retardant balls 9 are made of high water absorption resin material, the fire-retardant balls 9 are hollow, water is filled in the hollow, the fire-retardant balls 9 can desorb water at high temperature, thereby playing a certain role of flame retardance, the water in the hollow thermal expansion ball 2 can prolong the dehydration time of the flame-retardant ball 9, effectively improve the flame-retardant time of the flame-retardant ball, and the water is filled in the hollow thermal expansion ball;
referring to fig. 3-5, a heat conducting rod 5 is inserted into the sealing block 3, one end of the heat conducting rod 5, which is far away from the sealing block 3, penetrates into the hollow thermal expansion ball 2, a material ball 6 is fixedly sleeved at one end of the heat conducting rod 5, which is positioned inside the hollow thermal expansion ball 2, the material ball 6 is of a hollow structure, one end of the heat conducting rod 5, which is positioned inside the material ball 6, is fixedly connected with a solid thermal expansion ball 7, the hollow thermal expansion ball 2 and the solid thermal expansion ball 7 are both made of thermal expansion materials with high expansion rates, so as to ensure that the liquid flame retardant 4 can be extruded out as much as possible by the expansion of the hollow thermal expansion ball 2, and also to ensure that the thimble 8 can puncture 801 by the expansion of the solid thermal expansion ball 7, and the lower end side wall of the solid thermal expansion ball 7 is fixedly connected with the thimble 8 which is vertically arranged, the material ball 6 is filled with lime powder, and the filling amount of the lime powder in the material ball 6 is 70% -80%, in order to reserve enough variable space for the expansion of the solid thermal expansion ball 7 and enable the expansion of the solid thermal expansion ball to be unimpeded, so that the thimble 8 can smoothly puncture the plugging film 601, a discharge hole is formed in the side wall of the lower end of the material ball 6, the plugging film 601 is fixedly connected to the discharge hole, and the plugging film 601 is located right below the thimble 8.
The working principle of the device is as follows: when flame erodes the equipment shell 101, the flame ignites the sealing block 3 to burn and melt, meanwhile, the high temperature of the flame is transferred to the solid thermal expansion ball 7 by the heat conducting rod 5, the solid thermal expansion ball 7 is heated and expanded to enable the thimble 8 to move downwards, the thimble 8 breaks the plugging film 601 to enable the lime powder to fall into water, the hollow thermal expansion ball 2 is expanded by the heat released by the reaction of the water and the lime powder, and therefore the liquid flame retardant 4 is extruded by the expanded hollow thermal expansion ball 2 through the opening of the spherical cavity, the phagocytosis of the flame to the equipment shell 101 is prevented, and the working time of the monitor is prolonged.
The scheme creatively adds the flame retardant device in the aluminum alloy die casting to prevent flame from invading the monitor, prolongs the working time of the monitor to a certain extent, provides fire scene internal monitoring pictures for fire fighters as much as possible, strives for precious time for rescue work, effectively reduces property and life loss, enlarges the solid thermal expansion ball 7 by utilizing the high temperature during flame combustion, enables the thimble 8 to burst the plugging film 601 to release lime powder, and expands and enlarges the hollow thermal expansion ball 2 by utilizing a large amount of heat released by the reaction of the lime powder and water, thereby extruding the liquid flame retardant 4 to prevent the flame from phagocytosing the equipment shell 101, and effectively prolongs the working time of the monitor.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.
Claims (9)
1. The utility model provides a security protection is high fire resistance aluminum alloy die casting for monitor, includes supervisory equipment body (1), supervisory equipment body (1) includes equipment shell (101), its characterized in that: the device comprises an equipment shell (101), wherein a plurality of spherical cavities which are arranged at equal intervals and are provided with openings are formed in the side wall of the equipment shell (101), a combustible sealing block (3) is filled in the opening of each spherical cavity, a hollow thermal expansion ball (2) is placed in each spherical cavity, a liquid flame retardant (4) is filled between each hollow thermal expansion ball (2) and the inner wall of each spherical cavity, water is filled in each hollow thermal expansion ball (2), a heat conduction rod (5) is inserted in each sealing block (3), one end, far away from each sealing block (3), of each heat conduction rod (5) penetrates into each hollow thermal expansion ball (2), a material ball (6) is fixedly sleeved at one end, far away from each sealing block (3), of each heat conduction rod (5) is higher than the water surface in each hollow thermal expansion ball (2), the filling amount of water in each hollow thermal expansion ball (2) and the filling amount of lime powder are added according to the proportion of complete reaction, the material ball (6) is of a hollow structure, one end of the heat conducting rod (5) which is located inside the material ball (6) is fixedly connected with a solid thermal expansion ball (7), the lower end side wall of the solid thermal expansion ball (7) is fixedly connected with a vertically arranged thimble (8), lime powder is filled inside the material ball (6), a discharge hole is formed in the lower end side wall of the material ball (6), a plugging film (601) is fixedly connected into the discharge hole, and the plugging film (601) is located under the thimble (8).
2. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 1, wherein: the hollow thermal expansion ball (2) and the solid thermal expansion ball (7) are both made of thermal expansion materials with high expansion rates.
3. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 1, wherein: the liquid flame retardant (4) is filled with flame-retardant balls (9), the filling amount of the flame-retardant balls (9) is 20-30%, and the diameter of each flame-retardant ball (9) is smaller than the width of an opening of the spherical cavity.
4. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 3, wherein: the flame-retardant ball (9) is made of a high-water-absorption resin material, the interior of the flame-retardant ball (9) is hollow, and water is filled in the hollow.
5. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 1, wherein: the inner wall of equipment shell (101) is fixed to be inlayed and is had a plurality of heat absorption seal wires (10), and heat absorption seal wire (10) are located the right hemisphere distribution of hollow thermal expansion ball (2), and is a plurality of heat absorption seal wire (10) all run through to the inside of hollow thermal expansion ball (2) and extend to aquatic.
6. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 5, wherein: the heat absorption guide wire (10) is composed of a heat conduction wire and a heat dissipation ball, and the heat dissipation ball is located below the water surface.
7. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 1, wherein: the filling amount of the lime powder in the material ball (6) is 70-80%.
8. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 1, wherein: the hollow thermal expansion ball (2) is filled with nitrogen, and the filling amount of the nitrogen is half of the internal volume of the hollow thermal expansion ball (2).
9. The high-fire-resistance aluminum alloy die casting for the security monitor as claimed in claim 1, wherein: the plugging film (601) is made of hard and easily-broken materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110290003.3A CN112972969B (en) | 2021-03-18 | 2021-03-18 | High-fire-resistance aluminum alloy die casting for security and protection monitor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110290003.3A CN112972969B (en) | 2021-03-18 | 2021-03-18 | High-fire-resistance aluminum alloy die casting for security and protection monitor |
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| CN112972969B true CN112972969B (en) | 2022-04-29 |
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| CN115334216B (en) * | 2022-07-21 | 2023-11-21 | 浙江越建工程管理有限公司 | Fire control remote monitering system |
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2021
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| US4735155A (en) * | 1985-03-14 | 1988-04-05 | The Johnson Company Limited | Fire resistant enclosures |
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