Mechanical automatic opening and closing heat insulation energy-saving protection device for electric energy metering box

Abstract

The present application relates to the field of electric energy metering box, specifically relates to a kind of mechanical automatic opening and closing heat insulation energy-saving protective device for electric energy metering box, including metering box body, the top of metering box body is provided with interlayer, heat dissipation fan is installed in interlayer, the both sides of heat dissipation fan are fixedly connected with baffle two, the both sides of baffle two are fixedly connected with baffle one, two symmetrically distributed air pipes two are arranged between baffle one and metering box body.The present application is driven by bimetallic temperature sensing sheet, without external power supply and control chip, left and right side cooling liquid tank is alternately cooled by adjusting plate swing, solve the cooling liquid heat saturation problem;Under normal circumstances, hollow air floatation bucket does not move up to block internal and external heat exchange, only when internal circulation fails, through the linkage of runner and lifting rod, the locking of inclined plane limiting plate is removed, utilize the negative pressure to introduce trace fresh air, cooperate with the accurate opening and closing of hollow air floatation bucket, the balance of heat dissipation efficiency and protection is realized, prolong the service life of equipment.

Description

Technical Field

[0001] This invention relates to the field of electricity metering boxes, and more particularly to a mechanical automatic opening and closing heat insulation and energy-saving protection device for electricity metering boxes. Background Technology

[0002] In the field of smart grid construction, outdoor power metering boxes, as key terminals for power data acquisition and distribution, have attracted much attention regarding their environmental adaptability and energy efficiency. However, existing metering box protection technologies have consistently struggled to overcome the conflict between heat dissipation and dust prevention.

[0003] Existing metering boxes mostly use open louvers or simple filter structures. During non-high-temperature periods, these openings remain open, failing to prevent the intrusion of external dust, insects, and rainwater, thus disrupting the continuity of the box's insulation layer. Current forced air cooling devices typically rely on direct fan blowing or simple internal and external air exchange, accelerating the deposition of external impurities inside the box. They lack a mechanical automatic opening and closing device to intelligently cut off or connect external air sources based on changes in internal heat load. Some high-end boxes attempt to introduce liquid cooling, but often neglect the cooling problem of the coolant itself. When the coolant absorbs a large amount of heat, if it cannot cool itself in time, it will quickly reach thermal saturation. Therefore, a mechanical automatic opening and closing heat-insulating and energy-saving protection device for electricity metering boxes is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the background art by proposing a mechanical automatic opening and closing heat insulation and energy-saving protection device for electricity metering boxes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box includes a metering box body, a sandwich layer on the top of the metering box body, a cooling fan installed inside the sandwich layer, partitions two fixed to both sides of the cooling fan, partitions one fixed to both sides of partitions two, two symmetrically distributed vent pipes two between partitions one and the metering box body, and the same top mounting block fixed to the side of the two partitions two away from partitions one. The top of the top mounting block is equipped with a vent pipe three. Both ends of the vent pipe three are connected to the internal interlayer of the metering box body. A protective device is installed on the branch pipe of the vent pipe three away from the heat dissipation fan. The bottom of the vent pipe three is connected to a heat insulation device, which includes a fan-shaped vent cavity. The two sides of the fan-shaped vent cavity are connected to the vent pipe four. The bottom of the vent pipe four is connected to a coolant tank. One side of the coolant tank is connected to the vent pipe one. The bottom of the vent pipe one penetrates into the metering box body. The ventilation pipe has a ventilation hole, and a limiting device is provided on both sides above the ventilation hole. The device includes a connecting cavity, which is connected to the ventilation pipe. An inclined limiting plate is slidably connected inside the connecting cavity, and a slider is fixed to one side of the inclined limiting plate. The outer wall of the slider is slidably connected to an automatic opening and closing device, which includes a limiting plate. The limiting plate is slidably connected to the slider through a groove. A sliding rod is fixed to one side of the limiting plate and is slidably connected to the top of the metering box body.

[0006] Preferably, a mounting base is fixed to one side of the bottom of the coolant tank, a bimetallic temperature sensor is fixed to one end of the mounting base, and a traction cable is fixed to the top of one of the bimetallic temperature sensors.

[0007] Preferably, a second rotating shaft is provided through the fan-shaped ventilation cavity, the second rotating shaft is rotatably connected to the fan-shaped ventilation cavity, and an adjustment plate is fixedly connected to the middle of the second rotating shaft.

[0008] Preferably, a torsion spring is arranged around the outer wall of the second rotating shaft, and the two ends of the torsion spring are respectively fixed to the fan-shaped ventilation cavity and the second rotating shaft.

[0009] Preferably, an external rod is fixed to the end of the rotating shaft away from the torsion spring, and one end of the external rod is connected to the traction cable.

[0010] Preferably, two brackets are installed on the top of one of the coolant tanks, and a rotating shaft is rotatably connected between the two brackets. A rotating wheel and a lifting rod are fixed to the outer wall of the rotating shaft, and two limiting plates are fixed to the bottom of the rotating wheel.

[0011] Preferably, the bottom of both slide rods is fixedly connected to a limit frame, and a rotating shaft three is rotatably connected through the limit frame. The rotating shaft three is not provided with a fixing piece, and a torsion spring two is fixedly connected between the fixing piece and the limit frame.

[0012] Preferably, an inclined connecting rod is fixed to the outer side of one of the rotating shafts, and a long push rod is fixed to the outer side of the other rotating shaft. An angle stop is provided on one side of the long push rod, and the angle stop is fixed to the slide rod.

[0013] Preferably, the protective device includes a hollow air flotation tank, which is slidably connected to the interior of the vent pipe three. The hollow air flotation tank has air holes, and a limit ring is provided above the hollow air flotation tank. The limit ring is located above the inclined limit plate and is fixedly connected to the interior of the vent pipe three. A top vent cover is provided on the top of the metering box body.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention utilizes a bimetallic temperature sensor for temperature sensing and drive, eliminating the need for an external power supply and control chip. Alternating cooling between the left and right coolant tanks is achieved through the swinging of an adjustment plate, resolving the coolant saturation problem. Under normal conditions, the hollow air flotation tank does not move to block internal and external heat exchange. Only when the internal circulation fails does the inclined limit plate release its lock via a linkage between the rotating wheel and lifting rod, introducing a small amount of fresh air using negative pressure. This significantly reduces the ineffective power consumption of the fan and external heat radiation, providing high protection and greatly reducing the probability of external dust and insects entering the metering box through the ventilation pipe. Combined with the precise opening and closing of the hollow air flotation tank, a balance between heat dissipation efficiency and protection is achieved, extending the equipment's lifespan. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of one part of the partition structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the coolant tank of the present invention; Figure 5 This is a schematic diagram of the cooling fan structure of the present invention; Figure 6 This is the present invention. Figure 5 Schematic diagram of the structure at point A in the middle; Figure 7 This is a schematic diagram of the internal structure of the fan-shaped ventilation cavity of the present invention; Figure 8 This is the present invention. Figure 7 Schematic diagram of the structure at point B; Figure 9 This is the present invention. Figure 7 Schematic diagram of the structure at point C; Figure 10 This is the present invention. Figure 7 Schematic diagram of the structure at point D.

[0016] In the diagram: 1. Metering box body; 2. Top vent cover; 3. Vent pipe one; 4. Vent pipe two; 5. Partition one; 6. Cooling fan; 7. Coolant tank; 8. Rotary wheel; 9. Bracket one; 10. Rotating shaft one; 11. Vent pipe three; 12. Vent hole; 13. Rotating shaft two; 14. External rod; 15. Vent pipe four; 16. Bimetallic temperature sensor; 17. Traction cable; 18. Mounting base; 19. Partition two; 20. Top mounting plate 21. Sliding rod; 22. Limiting plate one; 23. Fan-shaped ventilation chamber; 24. Torsion spring one; 25. Inclined connecting rod; 26. Limiting retaining ring; 27. Rotating shaft three; 28. Torsion spring two; 29. ​​Fixing plate; 30. Long push rod; 31. Limiting frame; 32. Adjusting plate; 33. Lifting rod; 34. Limiting plate two; 35. Sliding block; 36. Angle stop block; 37. Hollow air flotation tank; 38. Connecting cavity; 39. Inclined limiting plate. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Reference Figures 1-10 A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box includes a metering box body 1. The top of the metering box body 1 has a sandwich layer. A cooling fan 6 is installed inside the sandwich layer. Two partitions 19 are fixed to both sides of the cooling fan 6. Two partitions 5 are fixed to both sides of the partitions 19. Two symmetrically distributed vent pipes 4 are provided between the partitions 15 and the metering box body 1. The same top mounting block 20 is fixed to the side of the two partitions 19 away from the partitions 15. The top of the top mounting block 20 is provided with a vent pipe 3 11. Both ends of the vent pipe 3 11 are connected to the internal interlayer of the metering box body 1. A protective device is provided on the branch pipe of the vent pipe 3 11 on the side away from the cooling fan 6. The bottom of the vent pipe 3 11 is connected to a heat insulation device, which includes a fan-shaped vent chamber 23. The two sides of the fan-shaped vent chamber 23 are connected to the vent pipe 4 15. The bottom of the vent pipe 4 15 is connected to the coolant tank 7. One side of the coolant tank 7 is connected to the vent pipe 1 3. The bottom of the vent pipe 1 3 penetrates into the metering box body 1. In this embodiment, during internal heat exchange, the cooling fan 6 is activated, drawing hot air from one side of the metering box body 1 into the coolant tank 7 through the vent pipe 3. The coolant tank 7 contains coolant, which, after being cooled, enters the fan-shaped ventilation chamber 23 through the vent pipe 4 15, then enters the vent pipe 3 11, and is sent into the vent pipe 2 4 through the channel formed between the partition 5 and the metering box body 1, and is sprayed into the metering box body 1 from the bottom to complete the circulation.

[0020] Among them, a torsion spring 24 is arranged around the outer wall of the second rotating shaft 13, and the two ends of the torsion spring 24 are respectively fixed to the fan-shaped ventilation cavity 23 and the second rotating shaft 13.

[0021] A mounting base 18 is fixedly attached to the bottom side of the coolant tank 7. A bimetallic temperature sensor 16 is fixedly attached to one end of the mounting base 18. A traction cable 17 is fixedly attached to the top of one of the bimetallic temperature sensors 16.

[0022] A rotating shaft 13 is provided through the fan-shaped ventilation cavity 23. The rotating shaft 13 is rotatably connected to the fan-shaped ventilation cavity 23. An adjusting plate 32 is fixedly connected to the middle of the rotating shaft 13.

[0023] An external rod 14 is fixed to the end of the rotating shaft 13 away from the torsion spring 24, and one end of the external rod 14 is connected to the traction cable 17.

[0024] Two brackets 9 are installed on the top of one of the coolant tanks 7. A rotating shaft 10 is rotatably connected between the two brackets 9. A rotating wheel 8 and a lifting rod 33 are fixed to the outer wall of the rotating shaft 10. Two limiting plates 34 are fixed to the bottom of the rotating wheel 8.

[0025] In this embodiment, initially, under the preload of torsion spring 24, the adjusting plate 32 is driven by shaft 13 and closely fits the left side of the fan-shaped ventilation cavity 23 (defined as the side where the rotating wheel 8 is located). The driving force generated by the bimetallic temperature sensor 16 in the left coolant tank 7 due to temperature sensing is greater than the resistance of torsion spring 24. When the coolant temperature on the left is low, the bimetallic temperature sensor 16 bends, pulling the external rod 14 to rotate via the traction cable 17, causing the adjusting plate 32 to swing to the right, forcing the airflow to switch to the right channel. As the high-temperature airflow continuously heats the right coolant tank 7, the bimetallic temperature sensor 16 inside gradually straightens and releases the traction cable 17. The adjusting plate 32 returns to the left side under the action of torsion spring 24, the right channel closes, and natural cooling begins. Conversely, by alternating between the left and right sides, intermittent and efficient cooling of the coolant is achieved. Once the right side has cooled down, the bimetallic temperature sensor 16 bends again, pulling the external rod 14 to rotate via the traction cable 17, thereby causing the adjustment plate 32 to open the right channel and allow the left channel to cool down. Ventilation pipe 311 is provided with ventilation hole 12. Limiting devices are provided on both sides above the ventilation hole 12. The device includes a connecting cavity 38, which is connected to ventilation pipe 31. An inclined limiting plate 39 is slidably connected inside the connecting cavity 38. A slider 35 is fixedly connected to one side of the inclined limiting plate 39. The outer wall of the slider 35 is slidably connected to an automatic opening and closing device, which includes a limiting plate 22. The limiting plate 22 is slidably connected to the slider 35 through a sliding groove. A sliding rod 21 is fixedly connected to one side of the limiting plate 22. The sliding rod 21 is slidably connected to the top of the metering box body 1.

[0026] The bottom of both slide rods 21 is fixedly connected to a limit frame 31. A rotating shaft 27 is rotatably connected through the limit frame 31. A fixing piece 29 is provided at the point of the rotating shaft 27. A torsion spring 28 is fixedly connected between the fixing piece 29 and the limit frame 31.

[0027] One of the rotating shafts 27 has an inclined connecting rod 25 fixed to its outer side, and the other rotating shaft 27 has a long push rod 30 fixed to its outer side. An angle stop 36 is provided on one side of the long push rod 30, and the angle stop 36 is fixed to the slide rod 21.

[0028] The protective device includes a hollow air flotation tank 37, which is slidably connected to the inside of the vent pipe 31. The hollow air flotation tank 37 has air holes. A limit ring 26 is provided above the hollow air flotation tank 37. The limit ring 26 is located above the inclined limit plate 39 and is fixedly connected to the inside of the vent pipe 31. The top of the metering box body 1 is covered with a top vent cover 2.

[0029] In this embodiment, when the coolant inside both coolant tanks 7 is at a high temperature, the bimetallic temperature sensors 16 inside the left and right coolant tanks 7 are both in a vertical position. When the bimetallic temperature sensor 16 on the left rotates to a vertical position, it inserts into the limiting plate 2 34, causing the rotating wheel 8 to rotate. The rotating wheel 8 drives the lifting rod 33 to rotate to a horizontal position via the rotating shaft 10. At this time, the adjusting plate 32 is also in a horizontal position. The lifting rod 33 will lift the long push rod 30, and the long push rod 30 will drive the limiting plate 22 to move upward via the sliding rod 21, causing the slider to... 35 moves along the groove on the limiting plate 22, thereby pulling the inclined limiting plate 39 along the inside of the connecting cavity 38. The same applies to the right side. At this time, the inclined limiting plates 39 above the hollow air flotation tank 37 are all retracted into the connecting cavity 38. The hollow air flotation tank 37 moves upward under the action of gas negative pressure. The air hole on the hollow air flotation tank 37 is aligned with the air hole 12 on the air pipe 11, thereby introducing outside air to force-cool the inside of the metering box body 1 and the coolant tanks 7 on both sides, quickly suppressing the temperature rise and ensuring equipment safety.

[0030] When the temperature of the coolant tank 7 drops, the bimetallic temperature sensors 16 on both sides bend again. The bimetallic temperature sensor 16 on the left side will drive the rotating wheel 8 to rotate through the limiting plate 34, so that the lifting rod 33 no longer supports the long push rod 30, thereby causing the upper sliding rod 21 to drop due to gravity. The right adjustment plate 32 is pulled by the traction cable 17 and no longer supports the inclined connecting rod 25. Both inclined limiting plates 39 will reset, thus returning to the internal circulation process.

[0031] Working principle: During internal heat exchange, the cooling fan 6 starts, drawing the hot air from one side of the metering box body 1 into the coolant tank 7 through the vent pipe 3. The coolant tank 7 contains coolant, which, after being cooled, enters the fan-shaped ventilation chamber 23 through the vent pipe 4 15, then enters the vent pipe 3 11, and is sent into the vent pipe 2 4 through the channel formed between the partition 5 and the metering box body 1. It is then sprayed into the metering box body 1 from the bottom to complete the circulation.

[0032] Initially, under the preload of torsion spring 24, the adjusting plate 32, driven by shaft 13, fits tightly against the left side of the fan-shaped ventilation chamber 23 (the side where the rotating wheel 8 is located is defined as the left). The driving force generated by the bimetallic temperature sensor 16 in the left coolant tank 7 due to temperature sensing is greater than the resistance of torsion spring 24. When the coolant temperature on the left is low, the bimetallic temperature sensor 16 bends, pulling the external rod 14 to rotate via the traction cable 17, causing the adjusting plate 32 to swing to the right, forcing the airflow to switch to the right channel. As the high-temperature airflow continuously heats the right coolant tank 7, the bimetallic temperature sensor 16 inside gradually straightens and releases the traction cable 17. The adjusting plate 32 returns to the left side under the action of torsion spring 24, the right channel closes, and natural cooling begins. Conversely, by alternating between the left and right sides, intermittent and efficient cooling of the coolant is achieved. Once the right side has cooled down, the bimetallic temperature sensor 16 bends again and pulls the external rod 14 to rotate via the traction cable 17, thereby causing the adjustment plate 32 to open the right channel and the left channel to cool down.

[0033] When the coolant inside both coolant tanks 7 is at a high temperature, the bimetallic temperature sensors 16 inside both coolant tanks 7 are in a vertical position. When the bimetallic temperature sensor 16 on the left rotates to a vertical position, it inserts into the limiting plate 34, causing the rotating wheel 8 to rotate. The rotating wheel 8 drives the lifting rod 33 to rotate to a horizontal position via the rotating shaft 10. At this time, the adjusting plate 32 is also in a horizontal position. The lifting rod 33 will lift the long push rod 30, and the long push rod 30 will drive the limiting plate 22 to move upward via the sliding rod 21, causing the slider 35 to move along... The sliding groove on the limiting plate 22 moves, thereby pulling the inclined limiting plate 39 to move along the inside of the connecting cavity 38. The same applies to the right side. At this time, the inclined limiting plates 39 above the hollow air flotation tank 37 are all retracted into the connecting cavity 38. The hollow air flotation tank 37 moves upward under the action of gas negative pressure. The air hole on the hollow air flotation tank 37 is aligned with the air hole 12 on the air pipe 11, thereby introducing outside air to force-cool the inside of the metering box body 1 and the coolant tanks 7 on both sides, quickly suppressing the temperature rise and ensuring equipment safety.

[0034] When the temperature of the coolant tank 7 drops, the bimetallic temperature sensors 16 on both sides bend again. The bimetallic temperature sensor 16 on the left side will drive the rotating wheel 8 to rotate through the limiting plate 34, so that the lifting rod 33 no longer supports the long push rod 30, thereby causing the upper sliding rod 21 to drop due to gravity. The right adjustment plate 32 is pulled by the traction cable 17 and no longer supports the inclined connecting rod 25. Both inclined limiting plates 39 will reset, thus returning to the internal circulation process.

[0035] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mechanical automatic opening and closing heat-insulating and energy-saving protection device for an electricity metering box, comprising a metering box body (1), characterized in that, The top of the metering box body (1) is provided with a sandwich layer, and a heat dissipation fan (6) is installed inside the sandwich layer. Two partitions (19) are fixed to both sides of the heat dissipation fan (6). Two partitions (5) are fixed to both sides of the partitions (19). Two symmetrically distributed vent pipes (4) are provided between the partitions (5) and the metering box body (1). The same top mounting block (20) is fixed to the side of the two partitions (19) away from the partitions (5). The top of the top mounting block (20) is provided with a vent pipe three (11). The two ends of the vent pipe three (11) are respectively connected to the internal interlayer of the metering box body (1). A protective device is provided on the branch pipe of the vent pipe three (11) away from the heat dissipation fan (6). The bottom of the vent pipe three (11) is connected to a heat insulation device, which includes a fan-shaped vent cavity (23). The two sides of the fan-shaped vent cavity (23) are connected to the vent pipe four (15). The bottom of the vent pipe four (15) is connected to the coolant tank (7). The side of the coolant tank (7) is connected to the vent pipe one (3). The bottom of the vent pipe one (3) extends into the metering box body (1). Ventilation pipe three (11) is provided with ventilation hole (12), and limit devices are provided on both sides above the ventilation hole (12). The device includes a connecting cavity (38), which is connected to ventilation pipe three (11). An inclined limit plate (39) is slidably connected inside the connecting cavity (38), and a slider (35) is fixedly connected to one side of the inclined limit plate (39). The outer wall of the slider (35) is slidably connected to an automatic opening and closing device, which includes a limiting plate (22). The limiting plate (22) is slidably connected to the slider (35) through a set groove. A sliding rod (21) is fixedly connected to one side of the limiting plate (22). The sliding rod (21) is slidably connected to the top of the metering box body (1).

2. The mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 1, characterized in that: A mounting base (18) is fixed to the bottom of one side of the coolant tank (7), and a bimetallic temperature sensor (16) is fixed to one end of the mounting base (18), with a traction cable (17) fixed to the top of one of the bimetallic temperature sensors (16).

3. A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 2, characterized in that: A rotating shaft (13) is provided through the fan-shaped ventilation cavity (23). The rotating shaft (13) is rotatably connected to the fan-shaped ventilation cavity (23). An adjusting plate (32) is fixedly connected to the middle of the rotating shaft (13).

4. A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 3, characterized in that: The outer wall of the rotating shaft 2 (13) is surrounded by a torsion spring 1 (24), and the two ends of the torsion spring 1 (24) are fixedly connected to the fan-shaped ventilation cavity (23) and the rotating shaft 2 (13) respectively.

5. A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 4, characterized in that: An external rod (14) is fixed to one end of the rotating shaft (13) away from the torsion spring (24), and one end of the external rod (14) is connected to the traction cable (17).

6. A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 1, characterized in that: Two brackets (9) are installed on the top of one of the coolant tanks (7). A rotating shaft (10) is rotatably connected between the two brackets (9). A rotating wheel (8) and a lifting rod (33) are fixed to the outer wall of the rotating shaft (10). Two limiting plates (34) are fixed to the bottom of the rotating wheel (8).

7. A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 1, characterized in that: The bottom of both slide bars (21) is fixed to a limit frame (31). A rotating shaft three (27) is connected through and rotatably on the limit frame (31). A fixing piece (29) is provided at the point of the rotating shaft three (27). A torsion spring two (28) is fixed between the fixing piece (29) and the limit frame (31).

8. A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 7, characterized in that: One of the rotating shafts (27) has an inclined connecting rod (25) fixed to its outer side, and the other rotating shaft (27) has a long push rod (30) fixed to its outer side. An angle stop (36) is provided on one side of the long push rod (30), and the angle stop (36) is fixed to the slide rod (21).

9. A mechanical automatic opening and closing heat insulation and energy-saving protection device for an electricity metering box according to claim 1, characterized in that: The protective device includes a hollow air flotation tank (37), which is slidably connected to the inside of the three ventilation pipes (11). The hollow air flotation tank (37) has an air hole, and a limit ring (26) is provided above the hollow air flotation tank (37). The limit ring (26) is located above the inclined limit plate (39) and is fixedly connected to the inside of the three ventilation pipes (11). The top of the metering box body (1) is covered with a top ventilation cover (2).

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