Metal metering tank

Abstract

This invention discloses a metal metering box, specifically relating to the field of power equipment technology, comprising: a box body with a cover hinged to its front end; several fire extinguishing units, each filled with fire extinguishing medium and having a nozzle for spraying the medium, the nozzle facing the wiring terminals inside the box; several puncture units located at the nozzles of the fire extinguishing units, which break through the obstructions at the nozzles of the fire extinguishing units when the temperature of the wiring terminals inside the box rises rapidly; and several heat-conducting components that transfer heat from the wiring terminals inside the box to the puncture units. This invention, by transferring heat from the wiring terminals to the puncture units through the heat-conducting components, can react when the temperature of the wiring terminals rises abnormally, advancing the fire extinguishing opportunity from after the open flame occurs to the period of abnormal temperature rise, truly achieving early intervention and greatly reducing the risk of fire spread.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to an overheat protection metal metering box and its safety protection device used in the manufacturing, testing and aging process of power electronic components. Background Technology

[0002] In the manufacturing and testing of power electronic components (such as metal-oxide-semiconductor field-effect transistors, insulated-gate bipolar transistor chips and modules), performance verification of these components under high current and high temperature conditions is required. Such tests typically involve temporarily connecting multiple components to a metering box, distribution panel, or test cabinet for aging or functional testing. However, during testing, the terminals are under prolonged high load, making them highly susceptible to poor contact, overload, or short circuits, leading to a rapid increase in localized temperature. This can result in anything from burning out the tested components, affecting the accuracy of test results and production capacity, to causing equipment fires and significant losses.

[0003] Currently, some metal metering boxes used for testing address this issue by suspending a dry powder fire extinguisher at the top of the box and controlling its activation / deactivation via a temperature sensor. This method heavily relies on electronic components like the temperature sensor, which are prone to failure if damaged. Furthermore, being only located at the top, it doesn't effectively cover the fire extinguishing point. Therefore, some metal metering boxes incorporate an internal fire extinguishing chamber filled with dry extinguishing agent, surrounding the electricity meter and control switch. In the event of a short circuit and fire at the meter or control switch, the flames will spread to the fire extinguishing chamber. Since the chamber is made of flammable material, it easily ruptures, releasing the dry extinguishing agent, which then splashes out and extinguishes the flames. However, this internal fire extinguishing mechanism has a drawback: it only activates after the fire has started. Since electrical fires spread extremely quickly, even if the fire inside the metering box is extinguished, the fire may have already spread, rendering the protection inadequate. Summary of the Invention

[0004] The purpose of this invention is to provide a metal metering box, particularly for providing reliable overheat protection for testing equipment during the manufacturing, testing, or aging screening of power electronic components, in order to overcome the aforementioned shortcomings in the technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a metal measuring box, comprising: The box body has a lid hinged to its front end; Several fire extinguishing units, each filled with fire extinguishing medium and having a nozzle that can spray the medium, the nozzle being directed toward the wiring terminals inside the housing. Several puncture units are installed at the nozzle of the fire extinguishing unit, which break through the obstruction at the nozzle of the fire extinguishing unit when the temperature of the wiring terminals inside the box rises rapidly. Several heat-conducting components connect the internal wiring terminals of the housing to the puncture unit.

[0006] Preferably, several fire extinguishing units are fixedly installed inside the box cover, with each fire extinguishing unit located in front of a horizontal row of terminals inside the box. This arrangement enables fire extinguishing protection to be implemented in zones and directions, with each fire extinguishing unit precisely covering a row of risk points, greatly improving the utilization efficiency of the fire extinguishing agent and the targeting of fire extinguishing, and avoiding waste of resources and blind spots in protection.

[0007] Preferably, the fire extinguishing unit includes an extinguishing agent container and an airbag layer. The airbag layer is fixedly sealed at the nozzle of the extinguishing agent container. The extinguishing medium is filled inside the cavity between the extinguishing agent container and the airbag layer. A feeding pipe connected to the cavity is fixedly provided at the top of the extinguishing agent container. A one-way valve is fixedly provided on the feeding pipe. This structure achieves reliable sealing through the flexible airbag layer, which can be easily punctured upon triggering, ensuring the reliability of instantaneous release of the extinguishing agent. The feeding pipe and one-way valve facilitate the filling and replenishment of the extinguishing agent while maintaining the sealing of the cavity, making the fire extinguishing unit reusable and reducing maintenance costs.

[0008] Preferably, the heat-conducting component is flexible, bending along with the lid when the lid is closed and opened. This feature ensures that the heat-conducting component can deform flexibly without being damaged or detached during repeated opening and closing of the lid, thus guaranteeing the long-term reliability of the heat transfer path and the structural durability of the entire device.

[0009] Preferably, the outer end of the heat-conducting component is coated with an insulating heat-conducting layer. This insulating heat-conducting layer ensures efficient heat conduction while effectively isolating current, preventing safety risks caused by accidental electrification of the heat-conducting component, and improving the overall electrical safety of the metal metering box.

[0010] Preferably, the heat-conducting component includes a first heat-conducting copper sheet, a second heat-conducting copper sheet, and a connecting section. The first heat-conducting copper sheet, the second heat-conducting copper sheet, and the connecting section are an integral structure. The piercing unit is connected to the second heat-conducting copper sheet. The second heat-conducting copper sheet has an arc-shaped structure. The connecting section is corrugated and is the main deformation structure when bent. Several terminal connection buckles are integrally fixed on the first heat-conducting copper sheet. The terminal connection buckles are connected to the wiring terminals inside the housing. This integral structure ensures the continuity and efficiency of the heat conduction path. The terminal connection buckles ensure tight thermal contact with the wiring terminals. The arc-shaped second heat-conducting copper sheet provides installation and operation space for the triggering mechanism. The corrugated connecting section is specifically responsible for absorbing opening and closing deformation. Each part performs its function, making the overall structure both stable and flexible.

[0011] Preferably, two fixing plates are fixed between the two ends of the second heat-conducting copper sheet and the extinguishing agent container. The second heat-conducting copper sheet and the extinguishing agent container are fixed together by the two fixing plates. The connection between the second heat-conducting copper sheet and the extinguishing agent container is enhanced by the fixing plates, which prevents the components from shifting due to vibration or impact and ensures the accuracy of the relative position between the puncture unit and the airbag layer on the spray nozzle.

[0012] Preferably, the puncture unit includes a shape memory metal sheet and several puncture points. The two ends of the shape memory metal sheet are fixedly connected to a second thermally conductive copper sheet, and the shape memory metal sheet is bonded to the second thermally conductive copper sheet. When the temperature rises, the shape memory metal sheet deforms in the direction of the airbag layer and drives the puncture points to puncture the airbag layer. Several puncture points are fixedly connected to the shape memory metal sheet. This structure utilizes the characteristics of the shape memory metal sheet to directly convert the temperature signal into a mechanical puncture action, which has a fast response speed, requires no external energy, and is reliable in operation. Setting multiple puncture points can ensure that the airbag layer is effectively and thoroughly punctured, ensuring that the extinguishing agent is sprayed out smoothly.

[0013] Preferably, the top of the inside of the box cover is provided with a heat dissipation air outlet unit, which dissipates heat from several second heat-conducting copper sheets and piercing units; The heat dissipation unit includes a fixing block and several cooling fans. The fixing block is embedded in the top of the inside of the cover and is located above several second heat-conducting copper sheets and piercing units. Several mounting slots are opened on the fixing block, and several cooling fans are fixed inside the mounting slots. The heat dissipation unit can actively dissipate the heat accumulated in the heat-conducting components and the triggering mechanism, effectively reducing their temperature under normal operating conditions or ambient temperature rise, thereby maintaining the temperature of the memory metal sheet below the action threshold, significantly reducing the probability of false triggering caused by environmental factors, and improving the anti-interference ability and reliability of the system.

[0014] Preferably, the bottom of the cover is provided with an air intake unit, which is located below several second heat-conducting copper sheets and piercing units. The air intake unit and the heat dissipation exhaust unit form a bottom-to-top heat dissipation air channel. The air intake unit and the heat dissipation exhaust unit work together to form a complete forced convection heat dissipation air channel, which improves heat dissipation efficiency. The air intake unit includes a mounting frame and a filter plate. An air inlet is provided at the bottom of the box cover, and an outwardly expanding mounting groove is provided at the bottom of the air inlet. The filter plate is fixedly installed inside the mounting frame, and the mounting frame is installed inside the mounting groove. The filter plate can prevent dust and insects from entering and keep the inside of the box clean. Both ends of the inner wall of the mounting slot are provided with a movable groove, and each of the two movable grooves is provided with a movable limiting block. One end of each of the two movable limiting blocks extends to the bottom of both ends of the mounting frame and limits and fixes the mounting frame. The other end of each movable limiting block is fixedly connected to a return spring. One end of the return spring is fixedly connected to one end face inside the movable groove. Both sides of the movable limiting block are provided with a guide groove, and a fixed guide block is fixed on both sides of the inner wall of the movable groove. The two fixed guide blocks are respectively located inside the two guide grooves. The snap-fit ​​structure formed by the movable limiting block and the return spring allows the mounting frame of the filter screen to be quickly installed and removed without tools, which greatly facilitates the regular cleaning and maintenance of the filter screen and ensures the long-term unobstructed flow of the heat dissipation duct.

[0015] The technical effects and advantages provided by the present invention in the above technical solution are as follows: This invention transfers heat from the terminal block to the puncture unit through a heat-conducting component, enabling a response when the terminal block temperature rises abnormally. This advances the fire extinguishing opportunity from the time after the open flame occurs to the time of abnormal temperature rise, truly achieving early intervention and greatly reducing the risk of fire spread.

[0016] By using several fire extinguishing units with corresponding wiring terminals and a physical triggering structure, it has strong fire extinguishing targeting and does not rely on external power supply, and can still work reliably in the event of a circuit failure.

[0017] The middle connecting section of the heat-conducting component adopts a corrugated flexible connection design, which does not affect the normal opening and closing of the door, and the overall structure is stable and durable.

[0018] By setting up heat dissipation exhaust units and air intake units, the heat normally dissipated from the wiring terminals can be discharged. By utilizing the physical characteristic that the fault temperature rise rate is much greater than the heat dissipation rate, the system can effectively distinguish between ambient temperature rise and fault temperature rise, preventing false triggering caused by slow temperature rise. At the same time, it ensures that the real rapid fault heat flow can still trigger the fire suppression instantly, improving the selectivity and reliability of the system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the metal metering box in the closed state of the present invention; Figure 2 This is a schematic diagram of the overall structure of the metal measuring box of the present invention in the open state; Figure 3 This is a three-dimensional structural diagram of the fire extinguishing unit of the present invention; Figure 4 A three-dimensional structural diagram of a heat-conducting component and a puncture unit of the metal metering box in the closed state of the present invention; Figure 5 This is a three-dimensional structural diagram of another heat-conducting component and puncture unit of the metal metering box in the closed state of the present invention. Figure 6 A three-dimensional structural diagram of a heat-conducting component and a puncture unit in the open state of the metal metering box of the present invention; Figure 7 A three-dimensional structural diagram of another heat-conducting component and puncture unit of the metal metering box of the present invention in the open state; Figure 8 This is a three-dimensional structural diagram of the heat dissipation air outlet unit of the present invention; Figure 9 This is a three-dimensional structural diagram of the air intake unit of the present invention; Figure 10 For the present invention Figure 9 A schematic diagram of the enlarged structure of the middle A section; Figure 11 This is a three-dimensional cross-sectional view of the bottom of the box lid of the present invention; Figure 12 For the present invention Figure 11 Schematic diagram of the enlarged structure of B.

[0021] Explanation of reference numerals in the attached figures: 100. Box body; 110. Box lid; 200. Fire extinguishing unit; 210. Extinguishing agent container; 220. Airbag layer; 230. Feed pipe; 300, Heat-conducting component; 310, First heat-conducting copper sheet; 311, Terminal connector; 320, Second heat-conducting copper sheet; 321, Fixing plate; 330, Connecting section; 400. Puncture unit; 410. Shape memory metal sheet; 420. Puncture site; 500, Heat dissipation exhaust unit; 510, Fixing block; 511, Mounting slot; 520, Cooling fan; 600, Air inlet unit; 610, Mounting frame; 611, Movable slot; 612, Movable limit block; 613, Return spring; 614, Guide slot; 615, Fixed guide block; 620, Filter screen; 630, Air inlet; 640, Clip-on slot. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that the specific installation structure and circuit connection method of the power components such as the electricity meter and wiring terminals involved in this invention are common knowledge in the field, and are not all shown in the figures. Furthermore, they are not the focus of this invention's improvement, and therefore will not be elaborated upon further. This invention focuses on solving the problem of early warning and proactive firefighting of electrical fires inside metal metering boxes.

[0024] In existing technologies, to prevent early fires inside metal metering boxes, some boxes are equipped with fire extinguishing bags filled with dry extinguishing agents. These bags surround the meter and control switch. If the meter or control switch catches fire due to a short circuit, the flames will spread to the fire extinguishing bag. Since the bag is made of flammable material, it is easily ruptured, releasing the dry extinguishing agent. This exposed agent will then splash out and extinguish the flames. However, the fire extinguishing bags inside the metal metering box only release the extinguishing agent after the flames have burned through the bag, resulting in a delayed response and an inability to intervene in the early stages of a fire.

[0025] To address this problem, this invention proposes a metal metering box, comprising a box body 100, a box cover 110, several fire extinguishing units 200, several heat-conducting components 300, and several puncture units 400. These structures can actively trigger a fire extinguishing mechanism during the critical stage of abnormal temperature rise without the formation of open flame by monitoring the temperature of the wiring terminals in real time.

[0026] like Figure 1 and Figure 2As shown, the metal metering box includes a box body 100 and a box cover 110 hinged to its front end. The box body 100 houses the electricity meter and corresponding terminal blocks. The improvement of this invention is mainly integrated into the inner side of the box cover 110, where several fire extinguishing units 200 are fixedly installed. In a preferred embodiment, these fire extinguishing units 200 are arranged longitudinally, with each fire extinguishing unit 200 corresponding to a horizontal row of terminal blocks inside the box body 100, thereby achieving zoned and directional fire extinguishing protection and improving the utilization efficiency and targeting of the extinguishing agent.

[0027] like Figure 3 As shown, a single fire extinguishing unit 200 includes a long, narrow extinguishing agent container 210. A strip-shaped spray nozzle is located on the front of the container 210 (the side facing the interior of the housing). The spray nozzle is sealed by a flexible, well-sealed airbag layer 220. The extinguishing medium fills the cavity between the extinguishing agent container 210 and the airbag layer 220. The cavity can be pressurized, and the pressure can propel the extinguishing medium outwards. The extinguishing medium can be a dry powder extinguishing agent. A feeding pipe 230 is located at the top of the extinguishing agent container 210, equipped with a one-way valve for filling and replenishing the extinguishing agent, and for maintaining the cavity seal after filling.

[0028] Under normal circumstances, the airbag layer 220 remains intact, sealing the extinguishing agent within the cavity. When the airbag layer 220 is punctured, the pressure inside the cavity is released, and the extinguishing agent is rapidly ejected from the nozzle, covering the terminal area directly in front. To ensure that the airbag layer 220 can be punctured, the puncture point area can be thinned.

[0029] The heat-conducting component 300 and the puncture unit 400 enable temperature sensing and transmission at the wiring terminals, ensuring that the temperature can trigger the action. However, the specific transmission and triggering structure remains unclear. To address this issue, the following specific embodiment is described: like Figures 4 to 7 As shown, the heat-conducting component 300 serves as a heat transfer bridge connecting the terminal block and the piercing unit 400. It is flexible. The heat-conducting component 300 includes a first heat-conducting copper sheet 310, a second heat-conducting copper sheet 320, and a connecting section 330 connecting the two. All three are integrally formed and can be manufactured by integrally stamping and bending a copper strip. The first heat-conducting copper sheet 310 has multiple terminal connection buckles 311. These buckles can be directly snapped onto or sleeved onto the metal parts of the terminal block (such as screws or copper busbars). The shape of the terminal connection buckles 311 can be changed according to the terminal block that needs to be contacted, as long as it can connect to the terminal block and ensure good thermal contact. The second heat-conducting copper sheet 320 is arc-shaped and is fixed to both ends of the front of the extinguishing agent container 210 by two fixing plates 321 (the positions of the fixing plates 321 are as follows). Figure 3 (As shown). The connecting section 330 is corrugated, which gives it excellent flexibility. It is the main part where the heat-conducting component 300 bends and deforms during the opening and closing of the lid 110. Compared with... Figure 4 , Figure 5 The closed state and Figure 6 , Figure 7 The open status can be seen intuitively.

[0030] The outer surface of the heat-conducting component 300 can be coated with an insulating heat-conducting material. The outer ends of the first heat-conducting copper sheet 310, the terminal connecting buckle 311, the second heat-conducting copper sheet 320 and the connecting section 330 are all coated with an insulating heat-conducting coating, which can ensure electrical safety while ensuring heat transfer.

[0031] like Figure 4 and Figure 5 As shown, the puncture unit 400 is a direct triggering mechanism, comprising a shape memory metal sheet 410 and several sharp puncture points 420 fixed thereon. The shape memory metal sheet 410 is preferably made of a nickel-titanium alloy with a two-way shape memory effect. Its two ends are fixed and tightly fitted to the middle of the second heat-conducting copper sheet 320 by screws or riveting. The shape memory metal sheet 410 is pre-shaped into a flat or slightly curved shape, and when it reaches a set trigger temperature, which can be set to 75°C-90°C (below the ignition point but above the normal operating temperature), it can produce a significant bending deformation towards the airbag layer 220.

[0032] Working process: When the temperature of a terminal block rises abnormally, the heat is rapidly conducted to the first heat-conducting copper sheet 310 through the tightly connected terminal connector 311. The heat is then conducted to the second heat-conducting copper sheet 320 via the flexible corrugated connecting section 330. Due to the large-area contact between the second heat-conducting copper sheet 320 and the shape memory metal sheet 410, the heat is efficiently transferred to the shape memory metal sheet 410. The temperature of the shape memory metal sheet 410 rises to its phase change trigger point. Its internal crystal structure changes, generating a huge restoring force, driving the sheet to bend rapidly towards the airbag layer 220. The piercing part 420 fixed on the shape memory metal sheet 410 violently punctures the airbag layer 220 sealing the nozzle of the extinguishing agent container 210 as the sheet bends. The seal of the extinguishing chamber is broken instantly, and the dry powder extinguishing agent filled inside, under its own fluffy state and pressure, immediately gushes out from the ruptured nozzle, precisely covering the terminal block below that is in danger of overheating. The entire process is driven entirely by physical principles, requiring no power supply or electronic sensors. It boasts a rapid response, achieving ultra-early active fire suppression before sparks or open flames appear, nipping electrical fires in the bud. After troubleshooting the electrical fault, open the cover 110. Replace the punctured airbag layer 220 or the entire fire suppression unit module, and replenish the extinguishing agent through the feeding pipe 230. The shape memory metal sheet 410 automatically returns to its original shape after the temperature decreases. The entire system then returns to standby mode. It should be further noted that the triggering reliability of this system depends on the instantaneous temperature rise during the fault. Experiments show that during a typical terminal short-circuit fault, the contact temperature can jump from 40°C to over 200°C within 0.5 seconds, while the shape memory metal sheet (trigger temperature 85°C) used in this embodiment has a thermal response time of less than 0.3 seconds.

[0033] To prevent the shape memory metal sheet 410 from malfunctioning due to a slow increase in ambient temperature, such as in the case of high temperatures in summer, the present invention also includes an auxiliary heat dissipation system.

[0034] As attached Figure 8 , Figure 9 and Figure 11 As shown, inside the cover 110, a heat dissipation air outlet unit 500 is embedded above the array of fire extinguishing units 200, and an air inlet unit 600 is provided below.

[0035] The heat dissipation unit 500 includes a fixing block 510 with multiple mounting slots 511, each slot housing a cooling fan 520. When the cooling fan 520 is operating, it draws air upwards out of the cover 110.

[0036] The air inlet unit 600 includes a mounting frame 610, within which a filter screen 620 is fixed. The filter screen 620 is used for dust and insect prevention. The mounting frame 610 is installed inside the mounting groove 640 at the bottom end of the air inlet 630 at the bottom of the cover 110. The mounting frame 610 is fixed by movable limiting blocks 612 on both sides. The movable limiting blocks 612 can move back and forth at both ends of the bottom of the mounting frame 610 under the action of the return spring 613, thereby realizing convenient disassembly and assembly of the mounting frame 610 and the filter screen 620 (see...). Figure 10 and Figure 12 This makes it easy to clean the filter screen 620.

[0037] A forced-air cooling duct is formed between the exhaust unit 500 and the intake unit 600, running from bottom to top: external cold air is filtered from the bottom and enters the inner cavity of the cover, flowing over the surfaces of components such as the second thermally conductive copper plate 320 and the shape memory metal plate 410, carrying away the heat, and finally being extracted by the cooling fan 520 above. Under normal operating conditions or with a slow temperature rise, this cooling system can effectively maintain the temperature of the trigger mechanism below the safe threshold, avoiding false alarms. It should be noted that the cooling capacity of the cooling system is only designed for slow changes in ambient temperature (such as the temperature rise inside the enclosure in summer) and the slight heat generated when the terminals are working normally. When a real fault occurs (such as a short circuit or overload causing localized high temperatures at the contact points), the temperature rise rate at the terminals can reach tens of degrees Celsius per second, far exceeding the heat that the cooling fan can remove per unit time. Therefore, the heat generated at the moment of the fault will be rapidly conducted along the thermally conductive components to the shape memory metal plate, causing it to reach the trigger temperature in a very short time (usually less than 1 second) before the cooling system can remove the heat. Heat will only accumulate and eventually trigger the memory metal sheet when the rate and magnitude of temperature rise due to an abnormal fault exceed the balancing capacity of the heat dissipation system, thus achieving the synergistic effect of "preventing false activation during normal heat dissipation and promoting early activation when a fault generates strong heat".

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A metal measuring box, characterized in that, include: The box body (100) has a box cover (110) hinged to its front end. Several fire extinguishing units (200) are filled with fire extinguishing medium and have a nozzle for spraying the medium, which is directed toward the wiring terminals inside the housing (100). Several puncture units (400) are installed at the nozzle of the fire extinguishing unit (200), which break through the obstruction at the nozzle of the fire extinguishing unit (200) when the temperature of the wiring terminals inside the housing (100) rises rapidly; Several heat-conducting components (300) connect the internal wiring terminals of the housing (100) to the puncture unit (400).

2. The metal measuring box according to claim 1, characterized in that: Several fire extinguishing units (200) are fixedly installed inside the box cover (110), and each fire extinguishing unit (200) is respectively installed in front of a horizontal row of wiring terminals inside the box body (100).

3. The metal measuring box according to claim 1, characterized in that: The fire extinguishing unit (200) includes a fire extinguishing agent container (210) and an airbag layer (220). The airbag layer (220) is fixedly sealed at the nozzle of the fire extinguishing agent container (210). The fire extinguishing medium is filled in the cavity between the fire extinguishing agent container (210) and the airbag layer (220). A feeding pipe (230) connected to the cavity is fixedly provided at the top of the fire extinguishing agent container (210). A one-way valve is fixedly provided on the feeding pipe (230).

4. The metal measuring box according to claim 1, characterized in that: The heat-conducting component (300) has a bendable state, which bends along with the lid (110) when the lid (110) is closed and opened.

5. The metal measuring box according to claim 1, characterized in that: The outer end of the heat-conducting component (300) is coated with an insulating heat-conducting layer.

6. The metal measuring box according to claim 1, characterized in that: The heat-conducting component (300) includes a first heat-conducting copper sheet (310), a second heat-conducting copper sheet (320), and a connecting section (330). The first heat-conducting copper sheet (310), the second heat-conducting copper sheet (320), and the connecting section (330) are an integral structure. The piercing unit (400) is connected to the second heat-conducting copper sheet (320). The second heat-conducting copper sheet (320) has an arc-shaped structure. The connecting section (330) has a corrugated shape and is the main deformation structure when bent. Several terminal connection buckles (311) are integrally fixed on the first heat-conducting copper sheet (310). The terminal connection buckles (311) are connected to the wiring terminals inside the housing (100).

7. The metal measuring box according to claim 6, characterized in that: Two fixing plates (321) are fixed between the two ends of the second heat-conducting copper sheet (320) and the extinguishing agent container (210), and the second heat-conducting copper sheet (320) and the extinguishing agent container (210) are fixed together by the two fixing plates (321).

8. The metal measuring box according to claim 1, characterized in that: The puncture unit (400) includes a shape memory metal sheet (410) and several puncture parts (420). The two ends of the shape memory metal sheet (410) are fixedly connected to the second heat-conducting copper sheet (320). The shape memory metal sheet (410) is attached to the second heat-conducting copper sheet (320). When the temperature rises, the shape memory metal sheet (410) deforms in the direction of the airbag layer (220) and drives the puncture parts (420) to puncture the airbag layer (220). Several puncture parts (420) are fixedly connected to the shape memory metal sheet (410).

9. The metal measuring box according to claim 6, characterized in that: The top of the inside of the box cover (110) is provided with a heat dissipation air outlet unit (500), which dissipates heat from several second heat-conducting copper sheets (320) and puncture units (400); The heat dissipation air outlet unit (500) includes a fixing block (510) and a plurality of cooling fans (520). The fixing block (510) is embedded in the top of the inside of the cover (110). The fixing block (510) is located above a plurality of second heat-conducting copper sheets (320) and piercing units (400). A plurality of mounting slots (511) are provided on the fixing block (510). The plurality of cooling fans (520) are respectively fixed inside the plurality of mounting slots (511).

10. The metal measuring box according to claim 9, characterized in that: The bottom of the cover (110) is provided with an air inlet unit (600), which is located below several second heat-conducting copper sheets (320) and piercing units (400). A heat dissipation air duct from bottom to top is formed between the air inlet unit (600) and the heat dissipation air outlet unit (500). The air inlet unit (600) includes a mounting frame (610) and a filter plate (620). The bottom end of the cover (110) is provided with an air inlet (630). The bottom end of the air inlet (630) is provided with an outwardly expanding mounting groove (640). The filter plate (620) is fixedly installed inside the mounting frame (610). The mounting frame (610) is installed inside the mounting groove (640). Both ends of the inner wall of the mounting slot (640) are provided with a movable slot (611). Each of the two movable slots (611) is provided with a movable limiting block (612). One end of each of the two movable limiting blocks (612) extends to the bottom of both ends of the mounting frame (610) and limits and fixes the mounting frame (610). The other end of the movable limiting block (612) is fixedly connected to a return spring (613). One end of the return spring (613) is fixedly connected to one end face inside the movable slot (611). Both sides of the movable limiting block (612) are provided with a guide slot (614). A fixed guide block (615) is fixedly provided on both sides of the inner wall of the movable slot (611). The two fixed guide blocks (615) are respectively provided inside the two guide slots (614).

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