Power distribution cabinet body with built-in automatic protection switch

Abstract

This invention relates to the field of power distribution cabinet technology and discloses a power distribution cabinet with a built-in automatic protection switch. The cabinet includes a cabinet body with an internal air-cooling mechanism. The air-cooling mechanism includes a blower, an air outlet pipe, a fixed frame, a rotating shaft, a guide plate, a drive motor, a rotating rod, a surrounding groove, a movable sleeve, ball bearings, and a moving rod. The blower is fixedly installed on the outer wall of the cabinet body, and one end of the air outlet pipe is connected to the output end of the blower. This invention uses a temperature-controlled protection switch to accurately sense the internal temperature of the cabinet. When a specified value is reached, the blower and drive motor are automatically activated without manual intervention, achieving automated heat dissipation. The drive motor rotates the rotating rod, and the surrounding groove, ball bearings, and moving sleeve cause the guide plate to oscillate back and forth, changing the direction of the airflow from the blower. This allows the airflow to more comprehensively cover all areas inside the cabinet, avoiding heat dissipation dead zones and greatly improving the comprehensiveness and uniformity of air cooling.

Description

Technical Field

[0001] This invention relates to the field of power distribution cabinet technology, specifically to a power distribution cabinet with a built-in automatic protection switch. Background Technology

[0002] Distribution cabinets are divided into power distribution cabinets, lighting distribution cabinets, and metering cabinets, and are the final-level equipment in a power distribution system. Distribution cabinets are a general term for motor control centers. Distribution cabinets are used in situations where the load is relatively dispersed and there are fewer circuits; motor control centers are used in situations where the load is concentrated and there are more circuits. They distribute the electrical energy from a circuit of the upstream power distribution equipment to the nearest load. This level of equipment should provide protection, monitoring, and control for the load.

[0003] However, conventional accessory cabinets only use a waterproof and breathable membrane for ventilation and heat dissipation. In hot weather, the heat dissipation effect is poor, which can easily lead to unstable operation of electrical components inside the cabinet. Therefore, a power distribution cabinet with a built-in automatic protection switch is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a power distribution cabinet with a built-in automatic protection switch, which addresses the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a power distribution cabinet with built-in automatic protection switch, including a cabinet, and the cabinet is provided with an air-cooling mechanism, which includes a blower, an air outlet pipe, a fixed frame, a rotating shaft, a guide plate, a drive motor, a rotating rod, a surrounding groove, a moving sleeve, a ball bearing, and a moving rod; The hair dryer is fixedly installed on the outer wall of the cabinet. One end of the air outlet pipe is connected to the output end of the hair dryer, and the other end of the air outlet pipe passes through the outer wall of the cabinet. The fixed frame is fixedly installed on the inner wall of the cabinet. The rotating shaft is rotatably connected to the inner wall of the fixed frame. The guide plate is fixedly sleeved on the outer wall of the rotating shaft. The drive motor is fixedly installed on the inner wall of the cabinet. One end of the rotating rod is fixedly connected to the output end of the drive motor, and the other end of the rotating rod is rotatably connected to the inner wall of the cabinet. The surrounding groove is opened on the outer wall of the rotating rod. The movable sleeve is movably fitted on the outer wall of the rotating rod. The ball is fixedly connected to the inner wall of the movable sleeve, and the ball is slidably connected to the inner wall of the surrounding groove. The moving rod is fixedly connected to the outer wall of the movable sleeve, and the movable sleeve is movably connected to the inner wall of the guide plate.

[0006] Preferably, the outer wall of the air outlet pipe is movably fitted with a limiting sleeve, and the limiting sleeve is fixedly connected to the movable sleeve through a connecting rod.

[0007] Preferably, the air-cooling mechanism further includes a hinge plate and a baffle rod. The hinge plate is hinged to the side of the guide plate, the baffle rod is fixedly connected to the hinge plate, the air outlet pipe is provided with five air outlets, the number of baffle rods is five, the outer wall of each of the five baffle rods is provided with a protrusion, and the number of guide plates is six.

[0008] Preferably, the cabinet is provided with a suction mechanism, which includes a first cylinder, a heat dissipation mesh, and a first waterproof and breathable membrane. The first cylinder is fixedly inserted through the outer wall of the cabinet, the heat dissipation mesh is fixedly installed on the first cylinder, and the first waterproof and breathable membrane is fixedly installed on the inner wall of the first cylinder, and the first waterproof and breathable membrane is in contact with the heat dissipation mesh.

[0009] Preferably, a second cylinder is fixedly connected to the inner wall of the cabinet, and the inner wall of the second cylinder contacts the outer wall of the first cylinder. A mounting bracket is fixedly connected to the second cylinder, and a suction fan is rotatably connected to the mounting bracket. A drive shaft is rotatably connected to the inner wall of the cabinet, and the drive shaft is connected to a rotating rod via a synchronous pulley. The drive shaft is also connected to the rotating shaft of the suction fan via the synchronous pulley.

[0010] Preferably, a fixing plate is fixedly connected to the first cylinder, a striking rod is provided on the fixing plate, a contact plate is fixedly connected to the striking rod, a spring is sleeved on the striking rod, and the two ends of the spring are fixedly connected to the fixing plate and the contact plate respectively. A triangular block is fixedly connected to the suction fan.

[0011] Preferably, the cabinet is equipped with a temperature control protection switch, and the temperature control protection switch is electrically connected to the blower and the drive motor.

[0012] Preferably, the cabinet is provided with a ventilation mechanism, which includes a connecting pipe, an air inlet pipe, a first guide plate, a baffle, and a second waterproof and breathable membrane. The connecting pipe is connected to the top of the cabinet, and the air inlet pipe is connected to the side of the connecting pipe. The first guide plate is fixedly connected to the top of the cabinet, and the baffle is fixedly connected to the inner wall of the connecting pipe. The baffle has an installation groove, and the second waterproof and breathable membrane is installed on the inner wall of the installation groove and is in contact with the inner wall of the connecting pipe.

[0013] Preferably, a second guide plate is fixedly connected to the top of the cabinet, a side air vent is opened on the side of the air inlet pipe, a partition is fixedly connected to the inner wall of the air inlet pipe, and a dustproof net is fixedly connected to the inner wall of the air inlet pipe.

[0014] Preferably, there are four air inlet pipes, which are arranged around the outer wall of the connecting pipe.

[0015] The present invention, by adopting the above technical solution, can bring the following beneficial effects: 1. This power distribution cabinet with built-in automatic protection switch can accurately sense the internal temperature of the cabinet through the temperature control protection switch. When the specified value is reached, the blower and drive motor are automatically started without manual intervention, realizing automated heat dissipation. The drive motor drives the rotating rod to rotate, and the guide plate swings back and forth through the surrounding groove, ball bearings and moving sleeve, changing the direction of the airflow blown by the blower. This allows the airflow to more comprehensively cover all areas inside the cabinet, avoiding heat dissipation dead zones and greatly improving the comprehensiveness and uniformity of air cooling. At the same time, the setting of the deflector bar breaks the airflow boundary layer, allowing the airflow to make more sufficient contact with the surface of the heating element, strengthening the heat exchange process and further improving the heat dissipation effect.

[0016] 2. The power distribution cabinet with built-in automatic protection switch, through the transmission structure of the drive shaft and synchronous belt pulley, drives the suction fan to rotate synchronously when the rotating rod rotates, so as to expel the hot air inside the cabinet in time, accelerate air circulation, form a good ventilation effect, and significantly improve the overall heat dissipation efficiency when combined with the air cooling mechanism.

[0017] 3. The power distribution cabinet with built-in automatic protection switch uses a triangular block on the suction fan to periodically squeeze the contact plate during rotation, which drives the striking rod to strike the first waterproof and breathable membrane and heat dissipation mesh, preventing dust and debris from clogging the system, ensuring smooth airflow of hot air, and further enhancing the heat dissipation effect.

[0018] 4. This power distribution cabinet with built-in automatic protection switch, through the cooperation of four surrounding air inlet pipes, a first guide plate, a second guide plate and side air vents, can effectively guide the external airflow into the cabinet regardless of the external wind direction. This design expands the ventilation range, improves ventilation efficiency, and achieves more comprehensive automatic heat dissipation. The baffle setting avoids airflow short circuits, allowing the airflow to stably enter the cabinet to participate in the heat dissipation process, ensuring the stability of ventilation and heat dissipation.

[0019] 5. The power distribution cabinet with built-in automatic protection switch can effectively block external moisture from entering the cabinet through the heat dissipation mesh and the second waterproof and breathable membrane, preventing electrical components from being damaged by moisture and extending the service life of the equipment. The dustproof mesh can filter external dust and prevent dust from accumulating inside the cabinet, which would affect electrical performance and heat dissipation. This creates a clean and dry environment inside the cabinet and ensures the normal operation of electrical components. Attached Figure Description

[0020] Figure 1 This is a front view 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 the structure of the present invention; Figure 4This is a schematic diagram of the rear side of the structure of the present invention; Figure 5 This is a schematic diagram of the air-cooling mechanism of the present invention; Figure 6 This is a schematic diagram of the movable sleeve of the present invention; Figure 7 This is a schematic diagram of the suction mechanism of the present invention; Figure 8 This is a schematic diagram of the first cylinder of the present invention; Figure 9 This is a schematic diagram of the ventilation mechanism of the present invention; Figure 10 This is a schematic diagram of the internal structure of the ventilation mechanism of the present invention.

[0021] In the picture: 1. Cabinet; 2. Air-cooling mechanism; 21. Hair dryer; 22. Air outlet duct; 23. Fixing frame; 24. Rotating shaft; 25. Guide plate; 26. Drive motor; 27. Rotating rod; 28. Surrounding groove; 29. ​​Moving sleeve; 210. Ball bearing; 211. Moving rod; 212. Hinge plate; 213. Deflector rod; 214. Limiting sleeve; 3. Suction mechanism; 31. First cylinder; 32. Heat dissipation mesh; 33. First waterproof and breathable membrane; 34. Second cylinder; 35. Mounting bracket; 36. Suction fan; 37. Drive shaft; 38. Fixing plate; 39. Striking rod; 310. Contact plate; 311. Spring; 312. Triangular block; 4. Temperature control protection switch; 5. Ventilation mechanism; 51. Connecting pipe; 52. Air inlet pipe; 53. First guide plate; 54. Baffle; 55. Second waterproof and breathable membrane; 56. Second guide plate; 57. Side air outlet; 58. Partition; 59. Dustproof net. Detailed Implementation

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

[0023] 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.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0026] Please see Figure 1-10One embodiment of the present invention is: a power distribution cabinet with a built-in automatic protection switch, comprising a cabinet 1, an air-cooling mechanism 2 disposed inside the cabinet 1, the air-cooling mechanism 2 comprising a blower 21, an air outlet pipe 22, a fixing frame 23, a rotating shaft 24, a guide plate 25, a drive motor 26, a rotating rod 27, a surrounding groove 28, a movable sleeve 29, a ball bearing 210, and a moving rod 211. The blower 21 is fixedly installed on the outer wall of the cabinet 1, one end of the air outlet pipe 22 is connected to the output end of the blower 21, and the other end of the air outlet pipe 22 penetrates through the outer wall of the cabinet 1. The fixing frame 23 is fixedly installed on the inner wall of the cabinet 1, the rotating shaft 24 is rotatably connected to the inner wall of the fixing frame 23, the guide plate 25 is fixedly sleeved on the outer wall of the rotating shaft 24, and the drive motor 26 is fixedly installed. On the inner wall of cabinet 1, one end of rotating rod 27 is fixedly connected to the output end of drive motor 26, and the other end of rotating rod 27 is rotatably connected to the inner wall of cabinet 1. A surrounding groove 28 is formed on the outer wall of rotating rod 27. A movable sleeve 29 is movably fitted onto the outer wall of rotating rod 27. A ball bearing 210 is fixedly connected to the inner wall of movable sleeve 29, and the ball bearing 210 is slidably connected to the inner wall of surrounding groove 28. A moving rod 211 is fixedly connected to the outer wall of movable sleeve 29, and movable sleeve 29 is movably connected to the inner wall of guide plate 25. A limiting sleeve 214 is movably fitted onto the outer wall of air outlet duct 22, and the limiting sleeve 214 is fixedly connected to movable sleeve 29 via a connecting rod. The air-cooling mechanism 2 also includes a hinge plate 212 and a baffle rod 213. The hinge plate 212 is hinged to guide plate 25. On the side, the deflector bar 213 is fixedly connected to the hinge plate 212. Five air outlets are provided on the air outlet pipe 22. There are five deflector bars 213, each with protrusions on its outer wall. There are six guide plates 25. The cabinet 1 is equipped with a suction mechanism 3, which includes a first cylinder 31, a heat dissipation mesh 32, and a first waterproof and breathable membrane 33. The first cylinder 31 is fixedly connected through the outer wall of the cabinet 1. The heat dissipation mesh 32 is fixedly installed on the first cylinder 31. The first waterproof and breathable membrane 33 is fixedly installed on the inner wall of the first cylinder 31 and contacts the heat dissipation mesh 32. A second cylinder 34 is fixedly connected to the inner wall of the cabinet 1, and the inner wall of the second cylinder 34 contacts the outer wall of the first cylinder 31. A mounting bracket 35 is fixedly connected to the upper part of the cabinet 1. A suction fan 36 is rotatably connected to the mounting bracket 35. A drive shaft 37 is rotatably connected to the inner wall of the cabinet 1. The drive shaft 37 is connected to the rotating rod 27 via a synchronous pulley. The drive shaft 37 is connected to the rotating shaft of the suction fan 36 via a synchronous pulley. A fixing plate 38 is fixedly connected to the first cylinder 31. A striking rod 39 is provided on the fixing plate 38. A contact plate 310 is fixedly connected to the striking rod 39. A spring 311 is sleeved on the striking rod 39. The two ends of the spring 311 are fixedly connected to the fixing plate 38 and the contact plate 310 respectively. A triangular block 312 is fixedly connected to the suction fan 36. A temperature control protection switch 4 is provided inside the cabinet 1. The temperature control protection switch 4 is electrically connected to the blower 21 and the drive motor 26.

[0027] Working principle: When the temperature inside cabinet 1 rises to a specified value, the temperature control protection switch 4 activates the blower 21 and drive motor 26. The blower 21 blows outside air into the interior of cabinet 1 through the air outlet 22 for heat dissipation. At the same time, the drive motor 26 drives the rotating rod 27 to rotate. The rotation of the rotating rod 27 drives the moving sleeve 29 to move back and forth through the surrounding groove 28 and the ball bearing 210. The reciprocating movement of the moving sleeve 29 drives the guide plate 25 to swing back and forth through the moving rod 211, thereby more comprehensively cooling the interior of cabinet 1. At the same time, when the air blows onto the deflector 213, it generates turbulence, disrupting the boundary layer of the airflow and causing the airflow to... The rotating rod 27 makes more full contact with the surface of the heat-generating element, improving the heat dissipation effect. At the same time, the rotation of the rotating rod 27 drives the drive shaft 37 to rotate through the synchronous pulley, which in turn drives the suction fan 36 to rotate. This allows the hot air inside the cabinet 1 to be discharged into the cabinet 1 through the first waterproof and breathable membrane 33 and the heat dissipation mesh 32, thereby realizing the internal ventilation of the cabinet 1 and further improving the heat dissipation effect. Meanwhile, when the suction fan 36 rotates, it drives the triangular block 312 to rotate. When the triangular block 312 comes into contact with the contact plate 310, it will squeeze the contact plate 310, thereby causing the striking rod 39 to strike the first waterproof and breathable membrane 33 and the heat dissipation mesh 32, thereby improving the air exchange efficiency and further improving the heat dissipation effect.

[0028] Please see Figure 1-10 Based on the above embodiments, in another preferred embodiment of the present invention, the cabinet 1 is provided with a ventilation mechanism 5. The ventilation mechanism 5 includes a connecting pipe 51, an air inlet pipe 52, a first guide plate 53, a baffle 54, and a second waterproof and breathable membrane 55. The connecting pipe 51 is connected to the top of the cabinet 1, and the air inlet pipe 52 is connected to the side of the connecting pipe 51. The first guide plate 53 is fixedly connected to the top of the cabinet 1, and the baffle 54 is fixedly connected to the inner wall of the connecting pipe 51. An installation groove is provided on the 54, and the second waterproof and breathable membrane 55 is installed on the inner wall of the installation groove. The second waterproof and breathable membrane 55 is in contact with the inner wall of the connecting pipe 51. The top of the cabinet 1 is fixedly connected to the second guide plate 56. The side air inlet 52 is provided with the side air outlet 57. The inner wall of the air inlet 52 is fixedly connected to the partition plate 58. The inner wall of the air inlet 52 is fixedly connected to the dustproof net 59. There are four air inlets 52, and the four air inlets 52 are arranged around the outer wall of the connecting pipe 51.

[0029] Working principle: When the wind is blowing from the outside, and the wind direction is east, south, west, or north, the airflow is guided by the first guide plate 53 into the four air inlet pipes 52. Then, the outside airflow is guided into the connecting pipe 51 by the partition plate 58 and the dustproof net 59. At the same time, after being dehumidified by the second waterproof and breathable membrane 55, the airflow is guided into the interior of the cabinet 1 by the baffle plate 54 to dissipate heat inside the cabinet 1. When the wind direction is southeast, northeast, southwest, or northwest, the airflow is guided by the first guide plate 53 and the second guide plate 56 into the connecting pipe 51 through the side air vent 57. Then, under the action of the partition plate 58, the airflow enters the connecting pipe 51 and enters the cabinet 1 for heat dissipation under the action of the baffle plate 54.

[0030] This invention provides a power distribution cabinet with a built-in automatic protection switch. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A power distribution cabinet with a built-in automatic protection switch, comprising a cabinet (1), characterized in that: The cabinet (1) is equipped with an air-cooling mechanism (2), which includes a blower (21), an air outlet pipe (22), a fixed frame (23), a rotating shaft (24), a guide plate (25), a drive motor (26), a rotating rod (27), a surrounding groove (28), a moving sleeve (29), a ball bearing (210), and a moving rod (211). The blower (21) is fixedly installed on the outer wall of the cabinet (1). One end of the air outlet pipe (22) is connected to the output end of the blower (21), and the other end of the air outlet pipe (22) passes through the outer wall of the cabinet (1). The fixed frame (23) is fixedly installed on the inner wall of the cabinet (1). The rotating shaft (24) is rotatably connected to the inner wall of the fixed frame (23). The guide plate (25) is fixedly sleeved on the outer wall of the rotating shaft (24). The drive motor (26) is fixedly installed on the inner wall of the cabinet (1). One end of the rotating rod (27) is fixedly connected to the output end of the drive motor (26), and the other end of the rotating rod (27) is rotatably connected to the inner wall of the cabinet (1). The surrounding groove (28) is opened on the outer wall of the rotating rod (27). The movable sleeve (29) is movably sleeved on the outer wall of the rotating rod (27). The ball (210) is fixedly connected to the inner wall of the movable sleeve (29), and the ball (210) is slidably connected to the inner wall of the surrounding groove (28). The moving rod (211) is fixedly connected to the outer wall of the movable sleeve (29), and the movable sleeve (29) is movably connected to the inner wall of the guide plate (25).

2. The power distribution cabinet with a built-in automatic protection switch according to claim 1, characterized in that: The outer wall of the air outlet pipe (22) is movably fitted with a limiting sleeve (214), and the limiting sleeve (214) is fixedly connected to the movable sleeve (29) through a connecting rod.

3. A power distribution cabinet with a built-in automatic protection switch according to claim 2, characterized in that: The air-cooling mechanism (2) also includes a hinge plate (212) and a baffle rod (213). The hinge plate (212) is hinged to the side of the guide plate (25). The baffle rod (213) is fixedly connected to the hinge plate (212). The air outlet pipe (22) is provided with five air outlets. There are five baffle rods (213). The outer walls of the five baffle rods (213) are provided with protrusions. There are six guide plates (25).

4. A power distribution cabinet with a built-in automatic protection switch according to claim 3, characterized in that: The cabinet (1) is provided with a suction mechanism (3), which includes a first cylinder (31), a heat dissipation mesh (32), and a first waterproof and breathable membrane (33). The first cylinder (31) is fixedly inserted through the outer wall of the cabinet (1), the heat dissipation mesh (32) is fixedly installed on the first cylinder (31), and the first waterproof and breathable membrane (33) is fixedly installed on the inner wall of the first cylinder (31), and the first waterproof and breathable membrane (33) is in contact with the heat dissipation mesh (32).

5. A power distribution cabinet with a built-in automatic protection switch according to claim 4, characterized in that: The inner wall of the cabinet (1) is fixedly connected to a second cylinder (34), and the inner wall of the second cylinder (34) is in contact with the outer wall of the first cylinder (31). A mounting bracket (35) is fixedly connected to the second cylinder (34), and a suction fan (36) is rotatably connected to the mounting bracket (35). A drive shaft (37) is rotatably connected to the inner wall of the cabinet (1), and the drive shaft (37) is connected to the rotating rod (27) via a synchronous pulley. The drive shaft (37) is connected to the rotating shaft of the suction fan (36) via a synchronous pulley.

6. A power distribution cabinet with a built-in automatic protection switch as described in claim 5, characterized in that: A fixing plate (38) is fixedly connected to the first cylinder (31). A striking rod (39) is provided on the fixing plate (38). A contact plate (310) is fixedly connected to the striking rod (39). A spring (311) is sleeved on the striking rod (39). The two ends of the spring (311) are fixedly connected to the fixing plate (38) and the contact plate (310) respectively. A triangular block (312) is fixedly connected to the suction fan (36).

7. A power distribution cabinet with a built-in automatic protection switch according to claim 6, characterized in that: The cabinet (1) is equipped with a temperature control protection switch (4), and the temperature control protection switch (4) is electrically connected to the blower (21) and the drive motor (26).

8. A power distribution cabinet with a built-in automatic protection switch according to claim 7, characterized in that: The cabinet (1) is provided with a ventilation mechanism (5), which includes a connecting pipe (51), an air inlet pipe (52), a first guide plate (53), a baffle (54), and a second waterproof and breathable membrane (55). The connecting pipe (51) is connected to the top of the cabinet (1), and the air inlet pipe (52) is connected to the side of the connecting pipe (51). The first guide plate (53) is fixedly connected to the top of the cabinet (1), and the baffle (54) is fixedly connected to the inner wall of the connecting pipe (51). The baffle (54) has an installation groove, and the second waterproof and breathable membrane (55) is installed on the inner wall of the installation groove and is in contact with the inner wall of the connecting pipe (51).

9. A power distribution cabinet with a built-in automatic protection switch according to claim 8, characterized in that: The top of the cabinet (1) is fixedly connected to a second guide plate (56), the side of the air inlet pipe (52) is provided with a side air outlet (57), the inner wall of the air inlet pipe (52) is fixedly connected to a partition plate (58), and the inner wall of the air inlet pipe (52) is fixedly connected to a dustproof net (59).

10. A power distribution cabinet with a built-in automatic protection switch according to claim 9, characterized in that: The number of air inlet pipes (52) is four, and the four air inlet pipes (52) are arranged around the outer wall of the connecting pipe (51).

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