High-low voltage power distribution cabinet

Abstract

The invention discloses a high-low voltage power distribution cabinet which comprises a power distribution cabinet body, a fire extinguishing box, an emergency closing mechanism and a dry powder leading-out frame, according to the high-low voltage power distribution cabinet, when the high-voltage power distribution cabinet burns due to load or short circuit and the temperature in the power distribution cabinet rises to exceed 68 DEG C, a paraffin block is melted into a liquid state and flows out of the dry powder leading-out frame, and at the moment, the fire extinguishing box is opened; the lower end of the dry powder leading-out frame is in an open state, dry powder in the fire extinguishing box directly falls on the surface of the rotating baffle, and the rotating baffle deflects downwards under the pressure of the dry powder along with increase of the dry powder, so that the dry powder is guided to electric appliance structures such as a circuit breaker and a line bank in the power distribution cabinet body, and the purpose of rapid fire extinguishing is achieved. By adopting the mode, dry powder can be sprayed to an electric appliance structure in the power distribution cabinet while air entering the power distribution cabinet is reduced, and the potential safety hazard of combustion of the power distribution cabinet is effectively reduced.

Description

Technical Field

[0001] This invention relates to a power distribution cabinet, and more particularly to a high- and low-voltage power distribution cabinet. Background Technology

[0002] High and low voltage switchgear, as the name suggests, are power distribution equipment used in power supply systems for power distribution, control, metering, and cable connection. Generally, power supply bureaus and substations use high voltage switchgear, which is then stepped down by transformers to the low voltage side and led out to low voltage switchgear. The low voltage switchgear then leads to various power distribution panels, control boxes, and switch boxes. Inside, there are power distribution devices that integrate switches, circuit breakers, fuses, buttons, indicator lights, meters, wires, and other protective devices to achieve the designed functional requirements.

[0003] In response, Chinese patent application number CN110148892B discloses a high and low voltage distribution cabinet, including a cabinet body; a set of ventilation openings on both sides of the cabinet body; a wedge-shaped baffle on the inner wall of the cabinet above the ventilation openings, and a sliding rod fixed to the baffle sliding up and down along the slide rails on both sides of the ventilation openings; a locking pin is slidably connected to the position below the sliding rod in the slide rails through a sliding hole, and the locking pin is used to lock the sliding rod; a tension spring is fixed between the locking pin and the heat-conducting plate, and the tension spring is in a stretched state; the first cavity is filled with solidified naphthalene, which melts when the temperature is above 80 degrees Celsius; the present invention utilizes the fact that when the naphthalene melts at a temperature above 80 degrees Celsius, it loses its support for the locking pin, and the locking pin releases the sliding rod under the action of the tension spring, causing the baffle to fall and close the ventilation opening, preventing oxygen from outside the cabinet from entering the cabinet through the ventilation opening, thus accelerating the fire extinguishing speed.

[0004] In response, Chinese patent application number CN212277675U discloses a high and low voltage distribution cabinet with good fire resistance. This utility model relates to the field of distribution cabinet technology, including a base, a body fixedly mounted on the upper surface of the base, frame doors rotatably connected to both sides of the middle of the front surface of the body, hollow frames fixedly mounted on both sides of the middle of the upper surface of the body, servo motors fixedly mounted inside the hollow frames, a rotating shaft fixedly mounted at the output end of the servo motor, the rotating shaft having external threads on its annular outer surface, and limiting frames fixedly mounted on both sides near the upper end of the body, with coil springs rotatably connected inside the limiting frames, the annular outer surface of the coil springs covered with a protective cloth. This distribution cabinet not only effectively prevents external dust from entering the body, protecting the internal circuit components from external dust, but also extinguishes internal fire sources, effectively protecting the internal circuit components.

[0005] Based on the aforementioned prior art and the descriptions in the comparative documents: When a fire occurs in a high- or low-voltage distribution cabinet due to overload or short circuit of electrical components, oxygen from outside the cabinet can enter through the ventilation openings, which can easily cause the fire to spread. Although the aforementioned comparative document uses the method of sealing the ventilation openings after the baffles fall to reduce the amount of air entering the distribution cabinet, the existing distribution cabinets are not completely sealed, and there is still some air inside the cabinet before sealing. Therefore, the above method can only slow down the spread of the fire and cannot quickly extinguish the fire, and there are still certain safety hazards. Existing high and low voltage distribution cabinets are generally equipped with heat dissipation mechanisms. These mechanisms use rotating fan blades to blow air around the cabinet, thus dissipating heat by increasing airflow. However, when the cabinet produces smoke due to a short circuit, the smoke is dispersed by the heat dissipation mechanism, preventing nearby personnel from promptly noticing any abnormalities. Summary of the Invention

[0006] The purpose of this invention is to provide a high- and low-voltage distribution cabinet to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high and low voltage distribution cabinet, comprising a distribution cabinet body, a fire extinguishing box, an emergency sealing mechanism, and a dry powder outlet rack. Emergency sealing mechanisms are provided on both the left and right sides of the distribution cabinet body. Multiple rotating ventilation flaps are provided inside each emergency sealing mechanism. Rotating shafts are fixedly connected to both sides of each rotating ventilation flap. The rotating shafts are disposed within connecting grooves located on the outer surface of the distribution cabinet body. The outer ends of the rotating shafts are rotatably connected to the distribution cabinet body. Connecting belts are provided on both the left and right sides inside the connecting grooves, and multiple rotating shafts pass through the middle of each connecting belt. A rotating shaft is fixedly connected to the outer side of the upper rotating shaft, and a bent connecting rod is fixedly connected to the inner side of the rotating wheel. The bent connecting rod is fixedly connected to a connecting baffle. A rotating baffle is fixedly connected to the inner side of the connecting baffle. A paraffin block is provided on the upper surface of the rotating baffle. The upper end of the paraffin block is located on the lower surface of the dry powder outlet rack. The dry powder outlet rack is fixedly connected to the fire extinguishing box. The fire extinguishing box is fixedly connected to the outer side of the power distribution cabinet. Dry powder is provided inside the fire extinguishing box. Electric guide rails are fixedly connected to both sides of the lower end of the fire extinguishing box. A heat dissipation mechanism is provided between the two electric guide rails.

[0008] As a preferred embodiment of the present invention, the heat dissipation mechanism is provided with a movable heat dissipation frame inside, the movable heat dissipation frame is slidably connected to two electric guide rails, the movable heat dissipation frame is provided with two heat dissipation vents in the middle, the heat dissipation vents are provided with exhaust fan blades inside, the inner side of the exhaust fan blades is rotatably connected to the output end of the motor, the upper and lower sides of the motor are fixedly connected with connecting brackets, the connecting brackets are fixedly connected to the movable heat dissipation frame, and the inner side of the upper connecting bracket is fixedly connected with a smoke sensor.

[0009] Based on the above technical solutions, the following supplementary explanations are provided: When the high-voltage distribution cabinet is working, the exhaust fan blades are rotated by the motor, which absorbs the heat generated around the distribution cabinet and extracts the absorbed heat to the outside, thereby reducing the temperature around the distribution cabinet. If heat dissipation is required in different parts of the distribution cabinet, the heat dissipation mechanism is moved vertically by the electric guide rail. By adjusting the position between the heat dissipation mechanism and the distribution cabinet body, the exhaust fan blades can dissipate heat to different parts of the distribution cabinet body.

[0010] As a preferred embodiment of the present invention, the power distribution cabinet is provided with an inner fixing frame, the lower end of the inner fixing frame is fixedly connected to the power distribution cabinet, a terminal block is fixedly connected to the middle of the inner side of the inner fixing frame, and multiple switch blocks are fixedly connected to the upper and lower sides of the terminal block, and the other end of the switch blocks is fixedly connected to a circuit breaker.

[0011] Based on the above technical solutions, the following supplementary explanations are provided: The switching mechanisms, circuit breakers, and terminal blocks are existing technologies for high and low voltage switchgear.

[0012] As a preferred embodiment of the present invention, a transformer is embedded inside the rear side of the power distribution cabinet. The inner side of the transformer is fixedly connected to a terminal block, and two external wires are fixedly connected to the outer side of the transformer. The outer ends of the external wires are located on the outer side of the power distribution cabinet.

[0013] Based on the above technical solutions, the following supplementary explanations are provided: The alternating current in the external wire is transformed by the transformer to change the voltage, current, and impedance, thereby converting the voltage into a low-voltage or high-voltage state.

[0014] As a preferred embodiment of the present invention, two electricity meters are fixedly connected to the upper surface of the outer surface of the power distribution cabinet, and multiple indicator lights are provided at the lower end of the electricity meters.

[0015] Based on the above technical solutions, the following supplementary explanations are provided: The indicator lights are used to show the working status of the distribution cabinet, and the two meters show the magnitude of the low-voltage current and high-voltage current respectively.

[0016] As a preferred embodiment of the present invention, the outer surface of the power distribution cabinet is provided with a cabinet door, one side of which is rotatably connected to the power distribution cabinet body, and fixed support legs are fixedly connected to the left and right sides of the lower end of the power distribution cabinet body.

[0017] Based on the above technical solutions, the following supplementary explanations are provided: Fixed feet support the distribution cabinet at a certain height, preventing the bottom of the distribution cabinet from directly contacting the ground and reducing the possibility of moisture at the bottom of the distribution cabinet.

[0018] As a preferred embodiment of the present invention, the exhaust fan blades adopt a reverse spiral structure.

[0019] Based on the above technical solutions, the following supplementary explanations are provided: When the fan blades with the anti-spiral structure rotate, an adsorption force can be formed on the front side, which can then draw the heat from the vicinity of the power distribution cabinet to the outside.

[0020] As a preferred embodiment of the present invention, a buzzer alarm is fixedly connected to the upper surface of the power distribution cabinet.

[0021] Based on the above technical solutions, the following supplementary explanations are provided: The smoke sensor detects whether there is smoke inside the power distribution cabinet. If smoke is generated, the smoke sensor transmits a signal to the buzzer alarm, which then sounds an alarm to alert nearby personnel that there is an abnormality in the high-voltage power distribution cabinet.

[0022] As a preferred embodiment of the present invention, the inner and outer directions of the rotating ventilation blade are downward and upward, respectively, and the angle between the rotating ventilation blade and the horizontal plane is 45°.

[0023] Based on the above technical solutions, the following supplementary explanations are provided: The initial state is when the rotating ventilation blades are at a 45° angle to the horizontal plane. A heat dissipation channel is formed between two adjacent rotating ventilation blades to dissipate the heat generated during normal operation of the power distribution cabinet.

[0024] As a preferred embodiment of the present invention, the melting point of the paraffin block is 68°C.

[0025] Based on the above technical solutions, the following supplementary explanations are provided: The paraffin block is a hard wax, grade 68. When the temperature around the paraffin block exceeds 68°C, the paraffin block melts into a liquid state.

[0026] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes an emergency sealing mechanism. When a high-voltage distribution cabinet catches fire due to overload or short circuit, and the internal temperature exceeds 68°C, the paraffin block melts into a liquid and flows out from the dry powder outlet rack. At this time, the lower end of the dry powder outlet rack is open, allowing the dry powder in the fire extinguishing box to fall directly onto the surface of the rotating baffle. As the amount of dry powder increases, the rotating baffle deflects downwards under the pressure of the dry powder, thus guiding the dry powder to the electrical structures inside the distribution cabinet, such as circuit breakers and terminal blocks, achieving rapid fire extinguishing. In addition, after the rotating baffle deflects, the rotating wheel connected to the rotating baffle rotates accordingly. The rotating wheel drives the rotating shaft at the upper position to rotate, and under the action of the connecting belt, multiple rotating shafts rotate together, causing the rotating ventilation blades to rotate into a vertical state. At this time, both sides of the distribution cabinet are closed, reducing the entry of outside air into the distribution cabinet. This method reduces the amount of air entering the distribution cabinet while simultaneously spraying dry powder onto the electrical structures inside, effectively reducing the safety hazard of the distribution cabinet catching fire.

[0027] This invention utilizes a heat dissipation mechanism. When the high-voltage distribution cabinet is in operation, the motor controls the fan blades to rotate, allowing the fan blades to absorb heat generated around the distribution cabinet and extract the absorbed heat to the outside, thereby lowering the temperature around the distribution cabinet. While absorbing heat, if smoke is generated inside the distribution cabinet due to a large load, the smoke is directed through the fan blades to the smoke sensor. The smoke sensor detects whether smoke is generated inside the distribution cabinet. If smoke is generated, the smoke sensor transmits a signal to a buzzer alarm, causing the buzzer alarm to sound and alerting nearby personnel that there is an abnormality in the high-voltage distribution cabinet. This invention utilizes an electric guide rail. When heat dissipation is required at different locations within the power distribution cabinet, the electric guide rail controls the heat dissipation mechanism to move vertically. By adjusting the position between the heat dissipation mechanism and the power distribution cabinet, the exhaust fan blades can effectively dissipate heat at different locations within the power distribution cabinet. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a structural schematic diagram of the present invention from an oblique, top-down perspective; Figure 4 This is a schematic diagram of the emergency sealing mechanism in this invention; Figure 5 This is a schematic diagram of the connection position between the dry powder export rack and the rotating baffle in this invention; Figure 6 This is a schematic diagram of the heat dissipation mechanism in this invention.

[0029] In the diagram: 1. Distribution cabinet; 2. Cabinet door; 3. Electricity meter; 4. Fire extinguisher box; 5. Electric guide rail; 6. Heat dissipation mechanism; 601. Movable heat dissipation rack; 602. Heat dissipation vent; 603. Motor; 604. Exhaust fan blade; 605. Connecting bracket; 7. Smoke sensor; 8. Buzzer alarm; 9. Emergency sealing mechanism; 901. Rotating ventilation blade; 902. Rotating shaft; 903. Connecting belt; 904. Rotating wheel; 905. Bending connecting rod; 906. Connecting baffle; 907. Rotating baffle; 10. Dry powder discharge rack; 11. Paraffin block; 12. Connecting groove; 13. External power cable; 14. Transformer; 15. Internal fixed frame; 16. Terminal block; 17. Circuit breaker; 18. Opening and closing switch; 19. Indicator light; 20. Fixed support leg. Detailed Implementation

[0030] 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.

[0031] Please see Figure 1-6 This invention provides a technical solution for high and low voltage distribution cabinets: according to Figure 1 , Figure 2 and Figure 3 , Figure 4 and Figure 6As shown, a high and low voltage distribution cabinet includes a cabinet body 1, a fire extinguishing box 4, an emergency sealing mechanism 9, and a dry powder discharge rack 10. Emergency sealing mechanisms 9 are provided on both the left and right sides of the cabinet body 1. Multiple rotating ventilation blades 901 are installed inside the emergency sealing mechanism 9. The inner and outer directions of the rotating ventilation blades 901 are downward and upward, respectively. The angle between the rotating ventilation blades 901 and the horizontal plane is 45°. Rotating shafts 902 are fixedly connected to both sides of the rotating ventilation blades 901. The rotating shafts 902 are located inside connecting grooves 12, which are located on the outer surface of the cabinet body 1. The outer ends of the rotating shafts 902 are rotatably connected to the cabinet body 1. Connecting straps 903 are provided on both the left and right sides inside the connecting grooves 12. Multiple rotating shafts 902 pass through the middle of the connecting straps 903. The outer surface of the rotating shafts 902 is relatively rough, allowing the connecting straps 903 to rotate when the connecting shafts rotate. A rotating wheel 904 is fixedly connected to the outer side of the upper rotating shaft 902, and a bent connecting rod is fixedly connected to the inner side of the rotating wheel 904. Rod 905, the bent connecting rod 905 is fixedly connected to the connecting baffle 906, and a rotating baffle 907 is fixedly connected to the inner side of the connecting baffle 906. A paraffin block 11 is provided on the upper surface of the rotating baffle 907. The melting point of the paraffin block 11 is 68°C. The upper end of the paraffin block 11 is set on the lower surface of the dry powder outlet frame 10. A through groove is provided at the connection position between the dry powder outlet frame 10 and the paraffin block 11. The through groove and the area of ​​the paraffin block 11 are large enough so that the melted paraffin can flow out directly under its own gravity. Outside the channel, after the paraffin wax melts, there are enough holes in the channel, through which the dry powder flows out. The paraffin wax block 11, in its solid state, fixes the rotating baffle 907 and the dry powder outlet bracket 10 to each other, preventing the rotating baffle 907 from rotating arbitrarily. The dry powder outlet bracket 10 is fixedly connected to the fire extinguishing box 4, which is fixedly connected to the outside of the power distribution cabinet 1. The fire extinguishing box 4 contains dry powder, and electric guide rails 5 are fixedly connected to both sides of the lower end of the fire extinguishing box 4. A heat dissipation mechanism 6 is set between the two electric guide rails 5.

[0032] according to Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the heat dissipation mechanism 6 has a movable heat dissipation frame 601 inside, which is slidably connected to two electric guide rails 5. The movable heat dissipation frame 601 has two heat dissipation vents 602 in the middle, and the heat dissipation vents 602 have exhaust fan blades 604 inside. The inner side of the exhaust fan blades 604 is rotatably connected to the output end of the motor 603. The upper and lower sides of the motor 603 are fixedly connected to the connecting brackets 605, which are fixedly connected to the movable heat dissipation frame 601. The upper connecting bracket 605 is fixedly connected to the inner side of the upper connecting bracket 605. The upper surface of the power distribution cabinet 1 is fixedly connected to the buzzer alarm 8, which is electrically connected to the smoke sensor 7. The buzzer alarm 8 has a signal receiving module for the smoke sensor 7 inside. The exhaust fan blades 604 adopt a reverse spiral structure.

[0033] according to Figure 3 As shown, the distribution cabinet 1 is equipped with an inner fixing frame 15. The lower end of the inner fixing frame 15 is fixedly connected to the distribution cabinet 1. A terminal block 16 is fixedly connected to the middle of the inner side of the inner fixing frame 15. Multiple switch blocks 18 are fixedly connected to the upper and lower sides of the terminal block 16. The other end of the switch blocks 18 is fixedly connected to the circuit breaker 17. The switch blocks 18, circuit breaker 17, and terminal block 16 are existing technologies for high and low voltage distribution cabinets. A transformer 14 is embedded inside the rear side of the distribution cabinet 1. The inner side of the transformer 14 is fixedly connected to the terminal block 16, and two terminals are fixedly connected to the outer side of the transformer 14. An external power line 13 carries alternating current and can be directly connected to a transformer 14. The outer end of the external power line 13 is located on the outside of the distribution cabinet 1. Two meters 3 are fixedly connected to the upper surface of the outer surface of the distribution cabinet 1. The two meters 3 display the magnitude of the low-voltage current and the high-voltage current, respectively. Multiple indicator lights 19 are set at the lower end of the meters 3. A cabinet door 2 is set on the outer surface of the distribution cabinet 1. One side of the cabinet door 2 is rotatably connected to the distribution cabinet 1. Fixed support legs 20 are fixedly connected to the left and right sides of the lower end of the distribution cabinet 1. The height of the fixed support legs 20 is set to 5cm.

[0034] In practical use, this invention provides a high and low voltage distribution cabinet. An external power line 13 is connected to a transformer 14. The alternating current in the external power line 13 is converted in voltage, current, and impedance by the transformer 14, thus transforming the voltage into a low or high voltage state. When the high voltage distribution cabinet is working, a motor 603 controls the exhaust fan blades 604 to rotate, causing the exhaust fan blades 604 to absorb heat generated around the distribution cabinet and extract the absorbed heat to the outside, thereby lowering the temperature around the distribution cabinet. If heat dissipation is required at different locations within the distribution cabinet, it is controlled by an electric guide rail 5. The heat dissipation mechanism 6 moves vertically. By adjusting the position between the heat dissipation mechanism 6 and the distribution cabinet 1, the exhaust fan blades 604 can dissipate heat to different locations on the distribution cabinet 1. While absorbing heat, if smoke is generated inside the distribution cabinet due to a large load, the generated smoke is passed through the exhaust fan blades 604 to the smoke sensor 7. The smoke sensor 7 detects whether smoke is generated inside the distribution cabinet. If smoke is generated, the smoke sensor 7 transmits a signal to the buzzer alarm 8, causing the buzzer alarm 8 to sound an alarm, alerting nearby personnel to the high voltage distribution. In the event of an abnormal situation, such as a fire caused by a load or short circuit in the high-voltage distribution cabinet, when the temperature inside the cabinet 1 exceeds 68°C, the paraffin block 11 melts into a liquid and flows out from the dry powder outlet rack 10. At this time, the lower end of the dry powder outlet rack 10 is open, and the dry powder in the fire extinguishing box 4 falls directly onto the surface of the rotating baffle 907. As the amount of dry powder increases, the rotating baffle 907 deflects downward under the pressure of the dry powder, thereby guiding the dry powder into the electrical structures inside the distribution cabinet 1, such as the circuit breaker 17 and the terminal block 16, achieving the purpose of rapid fire extinguishing. In addition, after the rotating baffle 907 deflects, the rotating wheel 904 connected to the rotating baffle 907 rotates accordingly. The rotating wheel 904 drives the rotating shaft 902 at the upper position to rotate. Under the action of the connecting belt 903, multiple rotating shafts 902 rotate together, thereby causing the rotating ventilation leaf 901 to rotate to a vertical state. At this time, both sides of the distribution cabinet 1 are closed, reducing the amount of outside air entering the distribution cabinet. This method reduces the amount of air entering the distribution cabinet while also spraying dry powder onto the electrical structure inside the distribution cabinet, effectively reducing the safety hazard of the distribution cabinet burning.

[0035] 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 high- and low-voltage distribution cabinet, comprising a distribution cabinet body (1), a fire extinguishing box (4), an emergency sealing mechanism (9), and a dry powder discharge rack (10), characterized in that: Emergency closing mechanisms (9) are provided on both the left and right sides of the power distribution cabinet (1). Multiple rotating ventilation blades (901) are installed inside the emergency closing mechanism (9). Rotating shafts (902) are fixedly connected to both sides of each rotating ventilation blade (901). The rotating shafts (902) are located inside a connecting groove (12), which is located on the outer surface of the power distribution cabinet (1). The outer end of the rotating shafts (902) is rotatably connected to the power distribution cabinet (1). Connecting belts (903) are provided on both the left and right sides inside the connecting groove (12). Multiple rotating shafts (902) pass through the middle of the connecting belts (903). A rotating wheel (904) is fixedly connected to the outer side of the upper rotating shaft (902). A bent connecting rod (905) is fixedly connected to the inner side of the wheel (904). The bent connecting rod (905) is fixedly connected to the connecting baffle (906). A rotating baffle (907) is fixedly connected to the inner side of the connecting baffle (906). A paraffin block (11) is provided on the upper surface of the rotating baffle (907). The upper end of the paraffin block (11) is provided on the lower surface of the dry powder outlet frame (10). The dry powder outlet frame (10) is fixedly connected to the fire extinguishing box (4). The fire extinguishing box (4) is fixedly connected to the outside of the power distribution cabinet (1). Dry powder is provided inside the fire extinguishing box (4). Electric guide rails (5) are fixedly connected to both sides of the lower end of the fire extinguishing box (4). A heat dissipation mechanism (6) is provided between the two electric guide rails (5).

2. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: The heat dissipation mechanism (6) is equipped with a movable heat dissipation frame (601) inside. The movable heat dissipation frame (601) is slidably connected to two electric guide rails (5). The movable heat dissipation frame (601) is provided with two heat dissipation vents (602) in the middle. The heat dissipation vents (602) are provided with exhaust fan blades (604) inside. The inner side of the exhaust fan blades (604) is rotatably connected to the output end of the motor (603). The upper and lower sides of the motor (603) are fixedly connected with connecting brackets (605). The connecting brackets (605) are fixedly connected to the movable heat dissipation frame (601). The upper connecting bracket (605) is fixedly connected to the inner side of the inner side of the connecting bracket (605). A smoke sensor (7) is fixedly connected.

3. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: The power distribution cabinet (1) is provided with an inner fixing frame (15). The lower end of the inner fixing frame (15) is fixedly connected to the power distribution cabinet (1). A terminal block (16) is fixedly connected to the middle of the inner side of the inner fixing frame (15). Multiple switch opening and closing devices (18) are fixedly connected to both the upper and lower sides of the terminal block (16). The other end of the switch opening and closing device (18) is fixedly connected to the circuit breaker (17).

4. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: A transformer (14) is embedded inside the rear side of the power distribution cabinet (1). The inner side of the transformer (14) is fixedly connected to the terminal block (16). Two external wires (13) are fixedly connected to the outer side of the transformer (14). The outer ends of the external wires (13) are located outside the power distribution cabinet (1).

5. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: Two meters (3) are fixedly connected to the upper side of the outer surface of the power distribution cabinet (1), and multiple indicator lights (19) are provided at the lower end of the meters (3).

6. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: The outer surface of the power distribution cabinet (1) is provided with a cabinet door (2). One side of the cabinet door (2) is rotatably connected to the power distribution cabinet (1). Fixed support legs (20) are fixedly connected to the left and right sides of the lower end of the power distribution cabinet (1).

7. A high- and low-voltage distribution cabinet according to claim 2, characterized in that: The exhaust fan blade (604) adopts a reverse spiral structure.

8. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: A buzzer alarm (8) is fixedly connected to the upper surface of the power distribution cabinet (1).

9. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: The inner and outer sides of the rotating ventilation blade (901) are downward and upward respectively, and the angle between the rotating ventilation blade (901) and the horizontal plane is 45°.

10. A high- and low-voltage distribution cabinet according to claim 1, characterized in that: The melting point of the paraffin block (11) is 68°C.

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