A distribution box with modular heat dissipation structure

Abstract

The present invention relates to a distribution box with a modular heat dissipation structure applied to the field of distribution boxes and cabinets. When the heat is dissipated in the box, in order to improve the heat exchange efficiency, the adjustment motor is started to release the traction rope, which drives the frame plate to slide in the arc guide rail to form a forward tilting state. By controlling the length of the traction rope released by the adjustment motor, the inclination of the frame plate is adjusted to achieve synchronous heat exchange on the front and back sides, avoid overlapping of contact surfaces, and improve the heat dissipation efficiency. If the electrical components are densely packed, resulting in a limited heat exchange area, the micro electric extension rod can be started to drive the linkage rod to deflect and rotate the movable plate to increase the contact area between the electrical components and the airflow and strengthen local heat dissipation. In addition, the electric extension rod is used to raise the drive motor to the height of the movable plate that needs to be cooled quickly, and the drive motor is started to drive the variable rack plate to approach, so that the cooling fan is on the same horizontal line, and the heat is concentrated. The efficiency of local heat dissipation is further comprehensively improved, and flexible adjustment of modular heat dissipation is achieved.

Description

Technical Field

[0001] The invention relates to a distribution box, in particular to a distribution box with a modular heat dissipation structure applied in the field of distribution boxes and cabinets. Background Art

[0002] The distribution box is a low-voltage power distribution device that assembles switchgear, measuring instruments, protective electrical appliances and auxiliary equipment in a closed or semi-closed metal cabinet or on a screen according to the requirements of electrical wiring. During normal operation, the circuit can be connected or disconnected by manual or automatic switches. During its operation, it is usually necessary to use a heat dissipation structure to control the temperature inside the box to avoid high temperature from causing adverse effects on the normal operation of internal electrical components.

[0003] The specification of Chinese invention patent CN202410094820.5 discloses an air-cooled energy-saving distribution cabinet, including a cabinet body. The scheme arranges a fan assembly and an air guide mechanism at the rear of the distribution cabinet. The fan assembly generates wind to dissipate heat from the heat sink of the equipment in the distribution box. The air guide mechanism adjusts the different rotation angles of multiple sets of guide plates, thereby controlling the wind direction to concentrate wind power to dissipate heat at the upper or lower position of the heat sink, thereby achieving the purpose of timely and rapid automatic heat dissipation. There is no need to open the cabinet door to let the equipment inside the distribution cabinet face the accumulation of dust, which helps to reduce the workload of manual unpacking and dust removal by the staff.

[0004] The heat dissipation structure in the existing distribution box generally adopts an interception filter design to prevent external dust from entering the interior of the box when performing air cooling and uses a structure with adjustable wind direction to modularly adjust the heat dissipation area. However, the electrical components inside the box are usually fixedly mounted on the rear wall of the box. During heat dissipation, the heat dissipation efficiency of the part where the electrical components are closely connected to the rear wall of the box is low, making it inconvenient to achieve rapid cooling. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when providing modular heat dissipation operation for the distribution box, the installation structure state of the electrical components and the rear wall of the box can be adjusted according to actual needs to ensure heat dissipation efficiency.

[0006] In order to solve the above problems, the present invention provides a distribution box with a modular heat dissipation structure, comprising a box body, a cooling fan arranged up and down is installed on the inner wall of one side of the box body, two module adjustment units are installed on the bottom wall of the box body through an axis frame, and the module adjustment unit comprises a frame plate, and the interior of the frame plate is equidistantly provided with penetrating receiving grooves, and the interior of the receiving groove is provided with a movable plate through an axis rod, and the surface of the movable plate is provided with an electrical component, and a top rod is installed on the top of the frame plate, and a slider is fixedly installed on the top of the top rod, and an arc guide rail matching the slider is installed on the inner top wall of the box body, and two adjustment motors are installed on the top of the box body, and the output end of the adjustment motor is connected to a winding rod located in the box body, and the surface of the winding rod is wound with a traction rope fixedly connected to the surface of the slider;

[0007] An arc-shaped groove is provided on the bottom wall of the accommodating groove, and an operating compartment located below the arc-shaped groove is provided inside the frame plate of the module adjustment unit. A linkage rod with an L-shaped cross-section is installed inside the operating compartment through a rotating rod, and the linkage rod is slidably connected to the inside of the arc-shaped groove, and the top of the linkage rod is fixedly connected to the movable plate. A micro-electric extension rod is installed inside the operating compartment, and the power end of the micro-electric extension rod is connected to the surface of the linkage rod.

[0008] In the above-mentioned distribution box with modular heat dissipation structure, the arrangement of electrical components in the box is adjusted by utilizing the cooperation of the adjustment motor, the module adjustment unit and the arc guide rail, thereby realizing flexible and efficient modular heat dissipation of the electrical components in the box.

[0009] As a further improvement of the present application, the diameter of the arc guide rail is equal to the sum of the height values ​​of the frame plate and the top rod, and the outermost arc guide rail and the winding rod are on the same axis.

[0010] As a further improvement of the present application, air permeable frames are installed through the inner walls on both sides of the box body, a waterproof air permeable plate is inlaid and installed inside the air permeable frame, and a movable door is installed on the front side of the box body through a hinge.

[0011] As a further improvement of the present application, the arc groove is arranged at a position close to the shaft rod, and one end of the arc groove close to the front side of the box body is the position where the linkage rod and the frame plate are in the same plane.

[0012] As a further improvement of the present application, a plurality of temperature sensors are installed on the front and back of each frame plate, and the temperature sensors are connected to the regulating motor signals.

[0013] As a further improvement of the present application, it also includes a temperature control and regulation system, which is installed on a processor on the surface of the box. The processor is connected to a temperature monitoring module, a regulation execution module and an auxiliary regulation module. The temperature monitoring module is connected to the temperature sensor signal for monitoring the temperature conditions on the surfaces of different frame plates inside the box. The regulation execution module is connected to the regulation motor and the cooling fan signal for receiving the temperature value of the temperature monitoring module to drive each frame plate to slide in the arc guide rail. The auxiliary regulation module is connected to the micro-electric extension rod signal for adjusting the degree of deflection of the movable plate in the receiving groove.

[0014] As another improvement of the present application, an electric telescopic rod is installed on the bottom wall of one side of the box body on which the cooling fan is installed, and a driving motor is installed on the power end of the electric telescopic rod. The output end of the driving motor is connected to a driving gear, and variable rack plates are meshingly connected on both sides of the driving gear, and the side surfaces of the two variable rack plates facing away from the air permeable frame are fixedly connected to the cooling fan.

[0015] As another improvement supplement of the present application, the variable rack plate includes a fixed rack, one end of which is equipped with multiple movable racks made of magnetic material through a shaft, and the sum of the lengths of the movable racks is less than half of the length of the variable rack plate itself, and the surfaces of the movable racks close to each other and the surfaces of the fixed racks close to the movable racks are both inlaid with electromagnetic blocks, and the electromagnetic blocks and the movable racks attract each other.

[0016] In summary, when the heat is dissipated in the box, the cooling fan is started to accelerate the heat dissipation. In order to improve the heat exchange efficiency, the adjusting motor is started to release the traction rope, driving the frame plate and the top rod to slide in the arc guide rail to form a forward tilting state. By controlling the length of the traction rope released by the adjusting motor, the inclination of the frame plate is adjusted to achieve synchronous heat exchange on the front and back sides, avoid overlapping contact surfaces, and improve the heat dissipation efficiency. If the electrical components are dense, resulting in a limited heat exchange area, the micro-electric extension rod can be started to drive the linkage rod to deflect, so that the movable plate rotates, increase the contact area between the electrical components and the airflow, and enhance local heat dissipation. In addition, in order to improve the problem that the local heat dissipation efficiency is difficult to enhance due to the upper and lower arrangement of the two cooling fans and the fixed wind direction, the electric telescopic rod is used to raise the drive motor to the height of the movable plate that needs to be cooled quickly, and the drive motor is started to drive the variable rack plate to approach, so that the cooling fans are on the same horizontal line, and the heat is concentrated to achieve flexible adjustment of modular heat dissipation. In this process, the length of the variable rack plate can be flexibly adjusted by using the movable rack and the electromagnetic block, so as to ensure that the variable rack plate will not be intercepted by the inner wall of the box when it moves in the reverse direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the first implementation method of the present application;

[0018] Figure 2This is a schematic diagram of the installation of the adjustment motor, the module adjustment unit, the arc guide rail, the top rod and the shaft frame of the first embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of the installation of the top rod, the slider and the winding rod of the first embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the installation of the movable plate and the frame plate of the first embodiment of the present application;

[0021] Figure 5 For this application Figure 4 A is an enlarged schematic diagram;

[0022] Figure 6 This is a schematic diagram of the installation of the movable plate, linkage rod and micro electric extension pole of the first embodiment of the present application;

[0023] Figure 7 This is a schematic diagram of the forward tilted state of the frame plate of the first embodiment of the present application;

[0024] Figure 8 This is a schematic diagram of the deflection state of the movable plate in the first embodiment of the present application;

[0025] Fig. 9 This is a schematic diagram of the installation of the electric telescopic rod, the drive motor, the drive rack and the variable rack plate of the second embodiment of the present application;

[0026] Fig.10 This is a schematic diagram of the composition of the variable rack plate of the second embodiment of the present application;

[0027] Fig.11 This is a schematic diagram of a state in which two cooling fans in the second embodiment of the present application are gradually at the same height.

[0028] Description of the numbers in the figure:

[0029] 1. Box body; 11. Movable door; 12. Ventilation frame; 2. Cooling fan; 3. Adjustment motor; 31. Winding rod; 4. Module adjustment unit; 41. Movable plate; 42. Linkage rod; 43. Arc groove; 44. Micro electric extension rod; 5. Arc guide rail; 6. Top rod; 61. Slider; 7. Axle frame; 13. Variable rack plate; 14. Driving gear; 15. Driving motor; 16. Electric telescopic rod; 131. Fixed rack; 132. Movable rack; 133. Electromagnetic block. DETAILED DESCRIPTION

[0030] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-3 A distribution box with a modular heat dissipation structure is shown, comprising a box body 1, a cooling fan 2 arranged up and down is installed on the inner wall of one side of the box body 1, two module adjustment units 4 are installed on the bottom wall of the box body 1 through an axis frame 7, the module adjustment unit 4 comprises a frame plate, the interior of the frame plate is equidistantly provided with penetrating receiving grooves, the interior of the receiving groove is installed with a movable plate 41 through an axis rod, the surface of the movable plate 41 is installed with electrical components, a top rod 6 is installed on the top of the frame plate, a slider 61 is fixedly installed on the top of the top rod 6, an arc guide rail 5 matching the slider 61 is installed on the inner top wall of the box body 1, two adjustment motors 3 are installed on the top of the box body 1, and the output end of the adjustment motor 3 is connected to a winding rod 31 located in the box body 1, and the surface of the winding rod 31 is wound with a traction rope fixedly connected to the surface of the slider 61;

[0033] Figure 4-6 An arc-shaped groove 43 is provided on the bottom wall of the accommodating groove, and an operating compartment located below the arc-shaped groove 43 is provided inside the frame plate of the module adjustment unit 4. A linkage rod 42 with an L-shaped cross-section is installed inside the operating compartment through a rotating rod, and the linkage rod 42 is slidably connected to the inside of the arc-shaped groove 43. The top end of the linkage rod 42 is fixedly connected to the movable plate 41, and a micro-electric extension rod 44 is installed inside the operating compartment, and the power end of the micro-electric extension rod 44 is connected to the surface of the linkage rod 42.

[0034] Specifically, when the heat dissipation operation is performed inside the box body 1, the heat dissipation fan 2 is started to accelerate the heat dissipation operation inside the box body 1. In addition, in order to enhance the heat exchange efficiency between the frame plate and the rear wall of the box body 1, the adjusting motor 3 can be started to release the traction rope on the surface of the winding rod 31, which can drive the frame plate and the top rod 6 to slide inside the arc guide rail 5 under the action of the slider 61, and form a forward tilting state under the constraint of the shaft frame 7, so that the electrical components on the surface of the movable plate 41 in the frame plate and the back side of the movable plate 41 are both in the space of the box body 1. By adjusting the different sliding amplitudes of the two frame plates in the arc guide rail 5 (that is, controlling the length of the traction rope on the surface of the winding rod 31 released by the two adjusting motors 3), the two frame plates are at different inclination degrees inside the box body 1, so that the two frame plates can realize the heat exchange operation on the front and back sides synchronously and improve the heat dissipation efficiency. At the same time, the staggered design can also be used to prevent the contact surfaces of the two frame plates from overlapping when dissipating heat, thereby further improving the heat dissipation efficiency (such as Figure 7 shown);

[0035] The electrical components on the surface of some movable plates 41 are arranged closely. When the frame plate tilts forward, the front contact area between the heat exchange airflow and the electrical components is limited, resulting in limited heat dissipation efficiency. At this time, the micro-electric extension rod 44 can be started to drive the linkage rod 42 to deflect around the rotating rod, so that the linkage rod 42 moves in the arc groove 43 and drives the movable plate 41 to rotate synchronously by virtue of the connection relationship with the movable plate 41, so that the front contact area between the electrical components on the surface of the movable plate 41 and the airflow provided by the heat dissipation fan 2 is increased, so as to better realize the enhanced heat dissipation in the local area (such as Figure 8 as shown).

[0036] The diameter of the arc guide rail 5 is equal to the sum of the heights of the frame plate and the top rod 6 , and the outermost arc guide rail 5 and the winding rod 31 are on the same axis.

[0037] Specifically, the diameter design of the arc guide rail 5 enables the frame plate and the top rod 6 to slide inside the arc guide rail 5, thereby realizing a tilting design under the constraint of the shaft frame 7, which facilitates the double-sided heat dissipation of the frame plate. At the same time, when the frame plate needs to be reset in subsequent maintenance and other situations, it is only necessary to adjust the motor 3 to rotate in the reverse direction to drive the traction rope to restore the reeled state and drive the slider 61 and the top rod 6 and the frame plate to reset.

[0038] A ventilation frame 12 is installed through both inner walls of the box body 1, and a waterproof ventilation plate is inlaid and installed inside the ventilation frame 12. A movable door 11 is installed on the front of the box body 1 through a hinge.

[0039] Specifically, the movable door 11 is used to protect the electrical components inside the box 1 from being disturbed. At the same time, the waterproof and breathable plate can prevent external water vapor, dust, etc. from entering the box 1 during air cooling, thereby protecting the safety of the electrical components inside the box 1.

[0040] The arc groove 43 is arranged at a position close to the shaft rod, and one end of the arc groove 43 close to the front face of the box body 1 is the position where the linkage rod 42 and the frame plate are in the same plane.

[0041] Specifically, the arc groove 43 is close to the shaft rod (that is, the center position of the accommodating groove), so that the micro-electric extension rod 44 can indirectly drive the movable plate 41 to move a larger displacement when it is extended by a smaller amplitude. In addition, one end of the arc groove 43 is placed in a position when the linkage rod 42 is in an undeflected state, so that when the linkage rod 42 moves in the arc groove 43, it will drive the electrical components on the surface of the movable plate 41 to move closer to the cooling fan 2, thereby improving the heat dissipation efficiency.

[0042] A plurality of temperature sensors are installed on the front and back of each frame plate, and the temperature sensors are connected to the regulating motor 3 signals.

[0043] It also includes a temperature control and regulation system, which is installed on a processor on the surface of the box body 1. The processor is connected to a temperature monitoring module, a regulation execution module and an auxiliary regulation module. The temperature monitoring module is connected to the temperature sensor signal for monitoring the temperature conditions on the surfaces of different frame plates inside the box body 1. The regulation execution module is connected to the regulation motor 3 and the cooling fan 2 for receiving the temperature value of the temperature monitoring module, driving each frame plate to slide in the arc guide rail 5. The auxiliary regulation module is connected to the micro electric extension rod 44 for adjusting the degree of deflection of the movable plate 41 in the receiving groove.

[0044] Specifically, when performing temperature control, the number and installation positions of the temperature sensors on the front of the frame plate correspond one-to-one with the movable plate 41, and the temperature monitoring module is used to monitor the temperature conditions at multiple positions on the surfaces of the two frame plates, so as to understand the temperature conditions on the back of the frame plate surface and which movable plate 41 has a higher temperature value, thereby providing a corresponding reference basis for the start-up of the adjustment execution module and the auxiliary adjustment module, controlling the adjustment motor 3 to start or drive the micro-electric extension rod 44 to adjust the deflection of the movable plate 41 to face the airflow of the cooling fan 2 and accept the cooling operation.

[0045] The second implementation method:

[0046] Figure 9-10 It is shown that an electric telescopic rod 16 is installed on the bottom wall of one side of the box body 1 on which the cooling fan 2 is installed, and a driving motor 15 is installed on the power end of the electric telescopic rod 16. The output end of the driving motor 15 is connected to a driving gear 14, and variable rack plates 13 are meshingly connected on both sides of the driving gear 14, and the side surfaces of the two variable rack plates 13 facing away from the air-permeable frame 12 are fixedly connected to the cooling fan 2.

[0047] The variable rack plate 13 includes a fixed rack 131, one end of which is equipped with a plurality of movable racks 132 made of magnetic material through a shaft, and the sum of the lengths of the movable racks 132 is less than half of the length of the variable rack plate 13 itself, and the surfaces of the movable racks 132 close to each other and the surfaces of the fixed racks 131 close to the movable racks 132 are both inlaid with electromagnetic blocks 133, and the electromagnetic blocks 133 and the movable racks 132 attract each other.

[0048] Different from the first embodiment, this embodiment can be used for optimization when limited heat dissipation operation is required at a movable plate 41 at a certain height (that is, when the temperature value there is significantly higher than the surface temperature values ​​of other movable plates 41 in the frame plate), and when the auxiliary heat dissipation module cannot complete rapid cooling in a short period of time after being started.

[0049] Specifically, in the first embodiment, the two cooling fans 2 are arranged in an upper and lower state, and the wind direction is in a relatively fixed state during heat dissipation. In order to meet the demand for local enhanced heat dissipation, the electric telescopic rod 16 is used to lift the driving motor 15 to the height of the movable plate 41 that urgently needs to be cooled quickly, and then the driving motor 15 is started to drive the two variable rack plates 13 to move closer to each other, so that the two cooling fans 2 are on the same horizontal line, so that the movable plate 41 that continues to cool quickly can simultaneously receive the concentrated heat dissipation airflow of the two cooling fans 2 during heat dissipation, thereby enhancing the heat dissipation effect (such as Fig.11 shown);

[0050] When the height of the cooling fan 2 is adjusted by using the electric telescopic rod 16, the end of the variable rack plate 13 may touch the inner top wall or the inner bottom wall of the box body 1, thereby restricting the operation of adjusting the cooling fan 2. Therefore, the variable rack plate 13 on both sides of the driving gear 14 is designed with a movable rack 132 at one end away from the cooling fan 2. When the variable rack plate 13 moves backward and is blocked by the inner wall of the box body 1, the electromagnetic block 133 can be turned off. At this time, the movable rack 132 loses its magnetic restraint effect and then bends, making room for the shortened variable rack plate 13 to continue to move backward.

[0051] In summary, when the heat is dissipated in the box body 1, the cooling fan 2 is started to accelerate the heat dissipation. In order to improve the heat exchange efficiency, the adjusting motor 3 is started to release the traction rope, driving the frame plate and the top rod 6 to slide in the arc guide rail 5 to form a forward tilting state. By controlling the length of the traction rope released by the adjusting motor 3, the inclination of the frame plate is adjusted to achieve synchronous heat exchange on the front and back sides, avoid overlapping contact surfaces, and improve the heat dissipation efficiency. If the electrical components are densely packed, resulting in a limited heat exchange area, the micro electric extension rod 44 can be started to drive the linkage rod 42 to deflect, so that the movable plate 41 rotates, and the contact area between the electrical components and the airflow is increased. Strengthen local heat dissipation. In addition, in order to improve the problem that the local heat dissipation efficiency is difficult to enhance due to the upper and lower arrangement of the two cooling fans 2 and the fixed wind direction, the electric telescopic rod 16 is used to raise the drive motor 15 to the height of the movable plate 41 that needs to be cooled quickly, and the drive motor 15 is started to drive the variable rack plate 13 to move closer, so that the cooling fans 2 are on the same horizontal line to concentrate the heat dissipation. In this process, the length of the variable rack plate 13 can be flexibly adjusted by using the movable rack 132 and the electromagnetic block 133, so as to ensure that the variable rack plate 13 will not be intercepted by the inner wall of the box body 1 when moving in the reverse direction.

[0052] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A distribution box with a modular heat dissipation structure, comprising a box body (1), characterized in that: A cooling fan (2) arranged up and down is installed on the inner wall of one side of the box body (1); two module adjustment units (4) are installed on the bottom wall of the box body (1) via an axis frame (7); the module adjustment unit (4) comprises a frame plate; the interior of the frame plate is provided with equidistant through receiving grooves; the interior of the receiving groove is provided with a movable plate (41) via an axis rod; the surface of the movable plate (41) is provided with electrical components; a top rod (6) is installed on the top of the frame plate; a slider (61) is fixedly installed on the top of the top rod (6); an arc-shaped guide rail (5) matching the slider (61) is installed on the inner top wall of the box body (1); two adjustment motors (3) are installed on the top of the box body (1); the output end of the adjustment motor (3) is connected to a winding rod (31) located in the box body (1); the surface of the winding rod (31) is wound with a traction rope fixedly connected to the surface of the slider (61); The bottom wall of the accommodating groove is provided with an arc-shaped groove (43); the frame plate of the module adjustment unit (4) is provided with an operating compartment located below the arc-shaped groove (43); a linkage rod (42) having an L-shaped cross section is installed inside the operating compartment via a rotating rod, and the linkage rod (42) is slidably connected to the inside of the arc-shaped groove (43); the top end of the linkage rod (42) is fixedly connected to the movable plate (41); a micro electric extension rod (44) is installed inside the operating compartment, and the power end of the micro electric extension rod (44) is connected to the surface of the linkage rod (42).

2. A distribution box with a modular heat dissipation structure according to claim 1, characterized in that: The diameter of the arc-shaped guide rail (5) is equal to the sum of the heights of the frame plate and the top rod (6), and the outermost arc-shaped guide rail (5) and the winding rod (31) are located on the same axis.

3. The distribution box with modular heat dissipation structure according to claim 1, characterized in that: A ventilation frame (12) is installed through both inner walls of the box body (1), a waterproof ventilation plate is inlaid inside the ventilation frame (12), and a movable door (11) is installed on the front of the box body (1) via a hinge.

4. The distribution box with modular heat dissipation structure according to claim 1, characterized in that: The arc groove (43) is arranged at a position close to the shaft rod, and one end of the arc groove (43) close to the front face of the box body (1) is the position where the linkage rod (42) and the frame plate are in the same plane.

5. The distribution box with modular heat dissipation structure according to claim 1, characterized in that: A plurality of temperature sensors are installed on the front and back of each frame plate, and the temperature sensors are connected to the regulating motor (3) by signal.

6. The distribution box with modular heat dissipation structure according to claim 5, characterized in that: The invention also includes a temperature control and regulation system, which is installed on a processor on the surface of the box body (1). The processor is connected to a temperature monitoring module, a regulation execution module and an auxiliary regulation module. The temperature monitoring module is connected to the temperature sensor signal and is used to monitor the temperature conditions of the surfaces of different frame plates inside the box body (1). The regulation execution module is connected to the regulation motor (3) and the cooling fan (2) signal and is used to receive the temperature value of the temperature monitoring module and drive each frame plate to slide in the arc guide rail (5). The auxiliary regulation module is connected to the micro electric extension rod (44) signal and is used to adjust the deflection degree of the movable plate (41) in the receiving groove.

7. The distribution box with modular heat dissipation structure according to claim 1, characterized in that: An electric telescopic rod (16) is installed on the bottom wall of one side of the box body (1) on which the cooling fan (2) is installed, a driving motor (15) is installed on the power end of the electric telescopic rod (16), an output end of the driving motor (15) is connected to a driving gear (14), both sides of the driving gear (14) are meshingly connected to variable rack plates (13), and the surfaces of the two variable rack plates (13) on one side facing away from the ventilation frame (12) are fixedly connected to the cooling fan (2).

8. The distribution box with modular heat dissipation structure according to claim 7, characterized in that: The variable rack plate (13) comprises a fixed rack (131), one end of the fixed rack (131) is mounted with a plurality of movable racks (132) made of magnetic material via a shaft, and the sum of the lengths of the movable racks (132) is less than half the length of the variable rack plate (13) itself, and electromagnetic blocks (133) are embedded and mounted on surfaces of the movable racks (132) close to each other and on surfaces of the fixed racks (131) close to the movable racks (132), and the electromagnetic blocks (133) and the movable racks (132) attract each other.

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