Security type electric energy metering box

Abstract

This invention provides a security-type electricity metering box, comprising a box body containing an electricity meter module and a fire detection module. A fire extinguishing device is connected to the bottom of the box body. The fire extinguishing device includes a vertically arranged shell containing a vertically distributed launching chamber and a gas storage chamber. The launching chamber contains, from top to bottom, a diaphragm, a fire extinguishing powder filler, and an explosive filler. The explosive filler is connected to an electric igniter. The gas storage chamber is designed to delay-triggered volume contraction after the explosive filler explodes, thereby utilizing the pressure change generated by the volume contraction to form an airflow into the box body through a jet duct. This invention can rapidly disperse the fire extinguishing powder using high-speed kinetic energy, quickly covering the fire source, and can also assist in the uniform diffusion of the fire extinguishing powder with airflow, further extending the floating time of the fire extinguishing powder.

Description

Technical Field

[0001] This invention relates to electricity metering boxes, specifically a security-type electricity metering box. Background Technology

[0002] As a key piece of equipment in the power system, the electricity metering box undertakes important functions of electricity metering, data recording, and electricity management. Its safe and stable operation is directly related to the economic benefits of power companies and the overall reliability of the power grid. In practical applications, electricity metering boxes are often installed outdoors or in complex environments. Long-term operation of internal electrical components (such as meters, transformers, and circuit breakers) may lead to localized high temperatures or electrical sparks due to aging wiring, short circuits, overloads, etc., thus posing a fire risk. Although traditional metering boxes have basic physical protection structures, they lack a rapid response mechanism for internal fires. Once a fire occurs, they often rely on external fire-fighting facilities or manual intervention, delaying fire suppression and potentially causing serious consequences such as equipment damage, data loss, or even the spread of the fire.

[0003] In existing technologies, fire extinguishing techniques for electricity metering boxes mostly rely on passive triggering mechanisms, such as using cryogenic fusible membranes or thermal expansion elements to control the opening and closing of the extinguishing powder outlet. While these methods can achieve initial automatic fire extinguishing, they have significant limitations: First, the release of the extinguishing powder depends on gravity or simple mechanical diffusion, resulting in low dispersion efficiency and difficulty in quickly covering the fire source; second, there is a lack of secondary reinforcement measures after extinguishing the fire, which may lead to repeated fires due to reignition. For example, some designs use extinguishing powder stored in a sealed box, released through membrane melting or sliding plate movement. However, these designs have insufficient spraying power for the extinguishing powder, resulting in low dispersion efficiency and the potential for creating blind spots in the corners of the box. Furthermore, the extinguishing powder gradually settles after release, causing a decrease in the floating concentration of the extinguishing powder within the electricity metering box, thus weakening its oxygen-blocking ability. If the high temperature of the electrical components inside the electricity metering box has not dissipated at this time, there is a risk of reignition when the high-temperature electrical components come into contact with oxygen again.

[0004] Therefore, there is an urgent need for a safety-type metering box that can rapidly disperse extinguishing powder using high-speed kinetic energy and be further diffused by airflow, while also extending the floating time of the extinguishing powder. Summary of the Invention

[0005] To overcome existing technical problems, this invention provides a security-type power metering box. This metering box can use high-speed kinetic energy to propel fire extinguishing powder to quickly disperse, thereby rapidly covering the fire source. It can also be supplemented by airflow to help the fire extinguishing powder spread evenly and extend the floating time of the fire extinguishing powder.

[0006] The present invention adopts the following technical solution.

[0007] A security-type electricity metering box includes a box body, an electricity meter module and a fire detection module inside the box body, and a fire extinguishing device connected to the bottom of the box body.

[0008] The fire extinguishing device includes a vertically arranged shell, inside which are a vertically distributed launching chamber and a gas storage chamber. The launching chamber contains, from top to bottom, a diaphragm, a fire extinguishing powder filler, and an explosive filler.

[0009] The explosive charge is connected to an electric igniter, which is electrically connected to the fire detection module.

[0010] An air intake and a jet duct connect the launch chamber and the gas storage chamber. The gas generated by the explosion of the explosive charge can enter the gas storage chamber through the air intake. A first check valve is provided at the air intake, which is used to restrict the gas in the gas storage chamber from entering the launch chamber through the air intake.

[0011] The gas storage chamber is designed to trigger a volume contraction after the explosive charge explodes, thereby utilizing the pressure change generated by the volume contraction to form an airflow into the chamber through the jet duct.

[0012] As a further improvement of the present invention, the housing includes a first housing and a second housing slidably sleeved on the outside of the first housing;

[0013] The bottom of the first housing is integrally connected to a plug. An air storage chamber is formed between the inner wall of the second housing and the plug. The air intake and exhaust channels are located on the plug. The second housing is connected to a reset assembly, which has the tendency to drive the second housing to move in a direction that reduces its own volume.

[0014] As a further improvement of the present invention, an elastic sheet is provided at the bottom of the housing, and the elastic sheet is linked with the second housing through a vibration mechanism.

[0015] The elastic sheet is inclined, with the end closest to the first housing being the lower end, which is connected to the housing as a whole, and the higher end of the elastic sheet being the free end.

[0016] As a further improvement of the present invention, the reset assembly includes a pulley, a spiral spring connecting the pulley, and a pull rope connecting the pulley and the second housing.

[0017] As a further improvement of the present invention, the vibration starting mechanism includes a transmission wheel integrally connected to the rope wheel, a pawl disposed on the transmission wheel, and a transmission block disposed at the bottom end of the elastic plate and adapted to the pawl.

[0018] As a further improvement of the present invention, a locking component is connected between the first housing and the second housing;

[0019] The locking assembly includes a locking cylinder integrally connected to the first housing, a mounting cavity is provided on the locking cylinder, a locking block is slidably connected in the mounting cavity, and a locking hole adapted to the locking block is provided on the second housing;

[0020] The locking block connection has a delayed unlocking structure.

[0021] As a further improvement of the present invention, the delayed unlocking structure includes a pneumatic chamber communicating with the mounting cavity, and the pneumatic pressure in the pneumatic chamber can push the locking block to move in a direction away from the centerline of the first housing;

[0022] The top of the air pressure chamber is connected to the air storage chamber through the air inlet, and the bottom of the air pressure chamber is connected to the air storage chamber through the air outlet. The effective flow area of ​​the air inlet is larger than the effective flow area of ​​the air outlet. A second check structure is provided in the air inlet. The second check structure is used to restrict the gas in the air pressure chamber from flowing into the air storage chamber through the air inlet.

[0023] The locking block is connected to a spring, which causes the locking block to tend to move toward the centerline of the first housing.

[0024] As a further improvement of the present invention, the first non-return structure includes a valve core and a spring connected to the valve core. The valve core is located at the end of the air intake away from the launch chamber and can block the air intake. The spring causes the valve core to have a tendency to move toward the launch chamber.

[0025] The beneficial effects of this invention are as follows: when a fire occurs, the fire detection module triggers the electric ignition head to work, causing the explosive filling to explode. The explosion shock wave "pre-fills" the extinguishing powder into most of the box with high-speed kinetic energy, quickly completing the initial coverage of the fire source.

[0026] As the high-pressure gas generated by the explosion disperses the extinguishing powder in the launch chamber into powder and completely discharges it into the container, the pressure inside the launch chamber drops sharply, creating a high-pressure difference between it and the storage chamber. The high-pressure gas in the storage chamber is then ejected into the container through the jet duct. This airflow drives the already suspended extinguishing powder to undergo secondary distribution, homogenizing the dispersed powder and creating a stable extinguishing atmosphere. The airflow seeps into gaps and corners, "pushing" or "sweeping" the extinguishing powder remaining on the main channels behind obstacles, achieving true all-around, no-dead-angle coverage.

[0027] When the gas storage chamber is delayed and its volume is reduced, the pressure change caused by the volume reduction creates an airflow that flows into the interior of the chamber through the jet duct. This airflow further disperses the extinguishing powder evenly within the chamber and extends the time the extinguishing powder can float. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0030] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0031] Figure 3 This is a schematic diagram of the reset component and vibration starting mechanism of the present invention;

[0032] Figure 4 This is one of the structural cross-sectional views of the fire extinguishing device of the present invention (at this time, the second shell and the first check structure are at the highest point of the stroke).

[0033] Figure 5 This is a second structural cross-sectional view of the fire extinguishing device of the present invention (at this time, the second shell and the first anti-reverse structure are at the lowest point of the stroke).

[0034] Figure 6 This is the third structural cross-sectional view of the fire extinguishing device of the present invention (at this time, the second housing is at the lowest point of the stroke, and the first anti-reverse structure is at the highest point of the stroke).

[0035] Figure 7 This is the fourth structural cross-sectional view of the fire extinguishing device of the present invention (at this time, the second housing is at the middle point of the stroke, and the first anti-reverse structure is at the highest point of the stroke).

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Housing; 2. Electricity meter module; 3. Fire detection module; 4. Fire extinguishing device; 41. Housing; 411. Launch chamber; 4111. Diaphragm; 4112. Fire extinguishing powder filler; 4113. Explosive filler; 412. Gas storage chamber; 413. First housing; 414. Second housing; 4141. Locking hole; 415. Plug; 42. Electric igniter; 43. Air inlet; 431. First check valve structure; 4311. Valve core; 4312, Spring; 44, Airflow Channel; 5, Reset Assembly; 51, Rope Wheel; 52, Spiral Spring; 53, Pull Rope; 6, Elastic Sheet; 7, Vibration Mechanism; 71, Transmission Wheel; 72, Pawl; 73, Transmission Block; 74, Elastic Structure; 8, Locking Assembly; 81, Locking Cylinder; 811, Mounting Cavity; 812, Air Pressure Chamber; 813, Air Inlet; 814, Exhaust Port; 82, Locking Block; 83, Second Backstop Structure; 84, Spring Sheet. Detailed Implementation

[0038] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0039] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Reference Figures 1 to 7 As can be seen, a security-type electricity metering box includes a box body 1, an electricity meter module 2 and a fire detection module 3 are installed inside the box body 1, and a fire extinguishing device 4 is connected to the bottom of the box body 1.

[0041] The fire extinguishing device 4 includes a vertically arranged shell 41. Inside the shell 41, there are a vertically distributed launching chamber 411 and a gas storage chamber 412. Inside the launching chamber 411, from top to bottom, there are a diaphragm 4111, a fire extinguishing powder filler 4112, and an explosive filler 4113.

[0042] The explosive charge 4113 is connected to an electric ignition head 42, which is electrically connected to the fire detection module 3.

[0043] An air intake 43 and a jet 44 are connected between the launch chamber 411 and the gas storage chamber 412. The gas generated by the explosion of the explosive charge 4113 can enter the gas storage chamber 412 through the air intake 43. A first check structure 431 is provided at the air intake 43. The first check structure 431 is used to restrict the gas in the gas storage chamber 412 from entering the launch chamber 411 through the air intake 43.

[0044] The gas storage chamber 412 is designed to delay-triggered volume contraction after the explosive charge 4113 explodes, thereby utilizing the pressure change generated by the volume contraction to form an airflow into the interior of the housing 1 through the jet duct 44.

[0045] In order to achieve a better diffusion effect of the fire extinguishing powder filler 4112, the installation area of ​​the electricity meter module 2 should be staggered with that of the fire extinguishing device 4.

[0046] Because the airflow generated by the explosion is extremely turbulent and highly directional, it resembles a "shock wave." It tends to travel in a straight line, creating numerous shadow areas when it encounters the electricity meter module 2. The extinguishing powder mainly follows the main flow and has difficulty penetrating these blind spots. However, using the technical solution of this invention, when a fire occurs, the fire detection module 3 triggers the electric igniter, causing the explosive charge 4113 to explode. The shock wave from the explosion then "pre-fills" the extinguishing powder with high-speed kinetic energy into most of the area inside the container 1, thereby achieving rapid coverage of the fire source.

[0047] As the high-pressure gas generated by the explosion disperses the extinguishing powder filler 4112 in the launch chamber 411 into powder and completely discharges it into the container 1, the gas pressure inside the launch chamber 411 drops sharply, creating a high-pressure difference between it and the storage chamber 412. The high-pressure gas in the storage chamber 412 is then ejected into the container 1 through the jet duct 44. This airflow drives the already suspended extinguishing powder to undergo secondary distribution, homogenizing the dispersed extinguishing powder and creating a stable extinguishing atmosphere. The airflow seeps into gaps and fills corners, "pushing" or "sweeping" the extinguishing powder remaining on the main path behind obstacles, achieving true all-round, no-dead-angle coverage. When the storage chamber 412 experiences a delayed volume contraction, the pressure change generated by the volume contraction creates an airflow through the jet duct 44 into the container 1. This airflow further disperses the extinguishing powder evenly within the container 1, thus extending the floating time of the extinguishing powder.

[0048] In this embodiment, the fire detection module 3 employs a composite sensor composed of one or more of the following: a temperature sensor, a smoke sensor, a gas sensor, and a light intensity sensor. Since the specific structural design of this composite sensor, its electrical connection method with the electric ignition head 42, and its triggering logic are all within the scope of conventional technology in this field and are well-known to those skilled in the art, they will not be described in detail here.

[0049] As a further improvement of the present invention, the housing 41 includes a first housing 413 and a second housing 414 slidably sleeved on the outside of the first housing 413;

[0050] The bottom end of the first housing 413 is integrally connected to a plug 415. An air storage chamber 412 is formed between the inner wall of the second housing 414 and the plug 415. An air intake duct 43 and an air jet duct 44 are provided on the plug 415. The second housing 414 is connected to a reset assembly 5. The reset assembly 5 has the tendency to drive the second housing 414 to move in a direction that reduces its own volume.

[0051] As another embodiment of the present invention, the second housing 414 can be an elastic airbag, which can increase the volume during the explosion. After a certain period of time (after the air pressure in the launch chamber 411 decreases), the expanded elastic airbag contracts, triggering the volume contraction, and the high-pressure gas in the airbag is sprayed into the housing 1 through the jet channel 44.

[0052] Reference Figure 3 As can be seen, the bottom end of the housing 1 is provided with an elastic sheet 6, and the elastic sheet 6 is linked with the second housing 414 through the vibration mechanism 7;

[0053] The elastic sheet 6 is inclined, with the end closest to the first housing 413 being the lower end and integrally connected to the housing 1, while the higher end of the elastic sheet 6 is the free end.

[0054] Over time, the extinguishing powder that was initially floating inside container 1 will gradually settle and accumulate at the bottom of container 1. Without external force, the extinguishing powder accumulated at the bottom cannot re-float and diffuse to the fire source area, leading to a decrease in the concentration of the extinguishing powder within container 1 and a weakening of its oxygen-isolating ability. Once this weakening isolation ability causes an increase in oxygen concentration within container 1, it becomes unable to sustainably suppress combustion. If the residual heat at the fire source is still significant, this heat (such as overheated components) will reheat surrounding combustibles (such as insulation), ultimately leading to reignition. Therefore, it is necessary to extend the floating time of the extinguishing powder within container 1. In this embodiment, by tilting the elastic sheet 6, it is possible to project the extinguishing powder towards the center. The vibration mechanism 7 is linked with the second housing 414. As the second housing 414 contracts in volume and blows gas into the box 1 through the jet duct 44, the second housing 414 can continuously drive the elastic sheet 6 to vibrate through the vibration mechanism 7. This causes the fire extinguishing powder that has fallen onto the surface of the elastic sheet 6 due to gravity to be re-thrown into the box 1 and dispersed again in the box 1 under the influence of the upward airflow.

[0055] Reference Figure 3 As can be seen, the reset assembly 5 includes a pulley 51, a spiral spring 52 connecting the pulley 51, and a pull rope 53 connecting the pulley 51 and the second housing 414.

[0056] Reference Figure 3 As can be seen, the vibration starting mechanism 7 includes a transmission wheel 71 integrally connected to the rope wheel 51, a pawl 72 provided on the transmission wheel 71, and a transmission block 73 provided at the bottom end of the elastic plate 6 and adapted to the pawl 72.

[0057] In this structure, when the spiral spring 52 drives the second housing 414 to move upward and reset, the transmission wheel 71 rotates synchronously. The transmission wheel 71 is provided with multiple pawls 72. When the transmission wheel 71 rotates a certain angle, the pawls 72 will drive the transmission block 73 to move a certain distance and quickly disengage, thereby causing the transmission block 73 and the elastic plate 6 to vibrate. In a specific embodiment of the present invention, the pawl 72 is disposed in the groove of the transmission wheel 71. The pawl 72 is close to the inner wall of the groove of the transmission wheel 71 on one side along the rotation direction of the transmission wheel 71, and close to the elastic structure 74 on the other side. When the second housing 414 moves downward due to the explosion, the transmission wheel 71 rotates counterclockwise. When the pawl 72 contacts the transmission block 73, the elastic structure 74 deforms, so that the pawl 72 cannot effectively drive the transmission block 73 to move, and therefore no vibration effect is formed. On the contrary, when the spiral spring 52 drives the second housing 414 to move upward and reset, the transmission wheel 71 rotates clockwise. Under the action of the inner wall of the groove of the transmission wheel 71, the pawl 72 cannot rotate. The pawl 72 will drive the transmission block 73 to move a distance and quickly disengage, thereby causing the transmission block 73 and the elastic plate 6 to vibrate. At this time, since the high end of the elastic sheet 6 is a free end, the closer it is to the high end, the greater the vibration amplitude will be, which will strengthen the power of the extinguishing powder in the edge area of ​​the high end to be thrown towards the center, making it more susceptible to the airflow generated when the volume of the second shell 414 contracts.

[0058] Reference Figure 5 As can be seen, a locking component 8 is connected between the first housing 413 and the second housing 414;

[0059] The locking assembly 8 includes a locking cylinder 81 integrally connected to the first housing 413. The locking cylinder 81 has a mounting cavity 811, and a locking block 82 is slidably connected in the mounting cavity 811. The second housing 414 has a locking hole 4141 adapted to the locking block 82.

[0060] Locking block 82 is connected to a delayed unlocking structure.

[0061] When the second housing 414 moves to the lowest point of its travel after the explosion, the locking block 82 can be inserted into the locking hole 4141 to achieve the locking effect.

[0062] Reference Figure 5 As can be seen, the delayed unlocking structure includes a pneumatic chamber 812 connected to the mounting cavity 811. The air pressure in the pneumatic chamber 812 can push the locking block 82 to move away from the centerline of the first housing 413.

[0063] The top of the air pressure chamber 812 is connected to the air storage chamber 412 through the air inlet 813, and the bottom of the air pressure chamber 812 is connected to the air storage chamber 412 through the exhaust port 814. The effective flow area of ​​the air inlet 813 is larger than the effective flow area of ​​the exhaust port 814. A second non-return structure 83 is provided in the air inlet 813. The second non-return structure 83 is used to restrict the gas in the air pressure chamber 812 from flowing into the air storage chamber 412 through the air inlet 813.

[0064] The locking block 82 is connected to a spring 84, which causes the locking block 82 to tend to move toward the center line of the first housing 413.

[0065] When the explosive charge 4113 detonates, the gas pressure in the launch chamber 411 rises rapidly, causing the high-pressure gas in the launch chamber 411 to enter the gas storage chamber 412 through the first check valve 431. At this time, a portion of the high-pressure gas flows into the pressure chamber 812 through the second check valve 83. The high-pressure gas entering the pressure chamber 812 can push the locking block 82 to move away from the centerline of the first housing 413. When the second housing 414 moves to the lowest point of its stroke so that the locking hole 4141 is directly opposite the locking block 82, the locking block 82 is inserted into the locking hole 4141 under the push of the high-pressure gas, achieving the locking effect. Within a certain time after the explosion, the high-pressure gas in the launch chamber 411 has been discharged into the housing 1, and a portion of the high-pressure gas in the gas storage chamber 412 has also been discharged through the jet duct 44. The high-pressure gas in the pressure chamber 812 is gradually discharged through the exhaust port 814. When the thrust of the high-pressure gas in the pressure chamber 812 on the locking block 82 is less than the elastic force of the spring 84 on the locking block 82, the locking block 82 disengages from the locking hole 4141, thus achieving the unlocking effect. It should be noted that setting the effective flow area of ​​the air inlet 813 to be larger than the effective flow area of ​​the exhaust port 814 is equivalent to increasing the speed at which the high-pressure gas enters the pressure chamber 812 and decreasing the speed at which the exhaust port 814 discharges, further achieving the effect of delayed unlocking.

[0066] Specifically, the second check valve structure 83 is installed at the air inlet 813 using a one-way valve seal.

[0067] Reference Figure 4-7 As can be seen, the first non-return structure 431 includes a valve core 4311 and a spring 4312 connected to the valve core 4311. The valve core 4311 is located at the end of the air intake 43 away from the launch chamber 411 and can block the air intake 43. The spring 4312 causes the valve core 4311 to have a tendency to move towards the launch chamber 411.

[0068] The complete operation process of this invention is as follows:

[0069] When a fire occurs, the fire detection module 3 triggers the electric ignition head 42 to operate, which in turn causes the explosive charge 4113 to explode. Part of the high-pressure gas generated by the explosion "pre-fills" most of the area inside the housing 1 with extinguishing powder, while the other part enters the gas storage chamber 412 through the first check valve 431. This pushes the second housing 414 downwards, increasing the volume of the gas storage chamber 412 and tightening the spiral spring 52. Furthermore, a portion of the high-pressure gas entering the gas storage chamber 412 flows into the pressure chamber 812 through the second check valve 83. This high-pressure gas entering the pressure chamber 812 tends to push the locking block 82 away from the centerline of the first housing 413. Thus, when the second housing 414 reaches its lowest point and the locking hole 4141 is aligned with the locking block 82, the locking block 82, pushed by the high-pressure gas, is inserted into the locking hole 4141, achieving locking between the first housing 413 and the second housing 414.

[0070] As the high-pressure gas generated by the explosion disperses the extinguishing powder filler 4112 in the launch chamber 411 into powder and completely discharges it into the container, the gas pressure inside the launch chamber 411 drops sharply, creating a high-pressure difference between it and the gas storage chamber 412. The high-pressure gas in the gas storage chamber 412 is then ejected into the container 1 through the jet duct 44. This airflow drives the already suspended extinguishing powder to undergo secondary distribution, homogenizing the dispersed extinguishing powder and creating a stable extinguishing atmosphere. The airflow seeps into gaps and fills corners, "pushing" or "sweeping" the extinguishing powder remaining on the main path behind obstacles, achieving true all-round, no-dead-angle coverage.

[0071] As the high-pressure gas in the pneumatic chamber 812 gradually exits through the exhaust port 814, when the thrust of the high-pressure gas in the pneumatic chamber 812 on the locking block 82 is less than the elastic force of the spring plate 84 on the locking block 82, the locking block 82 disengages from the locking hole 4141, thereby releasing the lock between the first housing 413 and the second housing 414. It should be noted that setting the effective flow area of ​​the air inlet 813 to be larger than the effective flow area of ​​the exhaust port 814 is equivalent to increasing the speed at which the high-pressure gas enters the pneumatic chamber 812 and decreasing the speed at which the gas exits through the exhaust port 814, further achieving the effect of delayed unlocking.

[0072] After the first housing 413 and the second housing 414 are unlocked, the spiral spring 52 releases its elastic energy, driving the rope wheel 51 to wind up the pull rope 53, which in turn pulls the second housing 414 upward. The volume of the gas storage chamber 412 then contracts, and the pressure change generated by this contraction creates an upward airflow through the jet duct 44, flowing into the interior of the container 1. This airflow further disperses the extinguishing powder evenly within the container 1. Simultaneously, the drive wheel 71 rotates as the spiral spring 52 releases its elastic energy. The drive wheel 71 has multiple pawls 72. Each time the drive wheel 71 rotates a certain angle, the pawls 72 move the drive block 73 a certain distance before quickly disengaging, causing the drive block 73 and the elastic plate 6 to vibrate. The inclined elastic plate 6, through this vibration, propels the extinguishing powder settled on its upper end towards the center, where it is dispersed again within the container 1 by the upward airflow generated by the contraction of the gas storage chamber 412. Since the high end of the elastic sheet 6 is a free end, the closer it is to the high end, the greater the vibration amplitude will be, which will enhance the power of the extinguishing powder in the edge area of ​​the high end to be thrown towards the center, making it more susceptible to the airflow generated when the volume of the second shell 414 contracts.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A security-type electricity metering box, comprising a box body, wherein an electricity meter module and a fire detection module are disposed inside the box body, characterized in that, A fire extinguishing device is connected to the bottom of the box. The fire extinguishing device includes a vertically arranged shell, and the shell has a launch chamber and a gas storage chamber distributed vertically. The launch chamber has a diaphragm, a fire extinguishing powder filler and an explosive filler arranged from top to bottom. The explosive charge is connected to an electric ignition head, which is electrically connected to a fire detection module. An air inlet and a jet outlet are connected between the launch chamber and the gas storage chamber. The gas generated by the explosion of the explosive charge can enter the gas storage chamber through the air inlet. A first check valve is provided at the air inlet, which is used to restrict the gas in the gas storage chamber from entering the launch chamber through the air inlet. The gas storage chamber is designed to delay-triggered volume contraction after the explosive charge explodes, thereby utilizing the pressure change generated by the volume contraction to form an airflow into the box through the jet duct. The housing includes a first housing and a second housing that is slidably sleeved on the outside of the first housing; The bottom end of the first housing is integrally connected to a plug, and the gas storage chamber is formed between the inner wall of the second housing and the plug. The air inlet and the air jet are located on the plug. The second housing is connected to a reset assembly, which has the tendency to drive the second housing to move in a direction that reduces its own volume. A locking assembly is connected between the first housing and the second housing; The locking assembly includes a locking cylinder integrally connected to the first housing, the locking cylinder having a mounting cavity, a locking block being slidably connected within the mounting cavity, and the second housing having a locking hole adapted to the locking block; The locking block is connected to a delayed unlocking structure; The delayed unlocking structure includes a pneumatic chamber connected to the mounting cavity, and the air pressure in the pneumatic chamber can push the locking block to move away from the centerline of the first housing. The top of the air pressure chamber is connected to the air storage chamber through an air inlet, and the bottom of the air pressure chamber is connected to the air storage chamber through an exhaust outlet. The effective flow area of ​​the air inlet is larger than the effective flow area of ​​the exhaust outlet. A second check structure is provided in the air inlet. The second check structure is used to restrict the gas in the air pressure chamber from flowing into the air storage chamber through the air inlet. The locking block is connected to a spring clip, which causes the locking block to tend to move toward the centerline of the first housing.

2. The security-type electricity metering box according to claim 1, characterized in that, The bottom of the housing is provided with an elastic sheet, which is linked to the second housing through a vibration mechanism. The elastic sheet is inclined, with its end near the first housing being the lower end and connected to the housing as a whole, and the upper end of the elastic sheet being the free end.

3. A security-type electricity metering box according to claim 2, characterized in that, The reset assembly includes a pulley, a spiral spring connected to the pulley, and a pull rope connecting the pulley to the second housing.

4. A security-type electricity metering box according to claim 3, characterized in that, The vibration starting mechanism includes a transmission wheel integrally connected to the rope wheel, a pawl disposed on the transmission wheel, and a transmission block disposed at the bottom end of the elastic plate and adapted to the pawl.

5. A security-type electricity metering box according to claim 1, characterized in that, The first check valve structure includes a valve core and a spring connected to the valve core. The valve core is located at the end of the air intake away from the launch chamber and can block the air intake. The spring causes the valve core to tend to move towards the launch chamber.

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