Distribution box

Abstract

The invention discloses a power distribution box which comprises a power distribution box body, a side ventilation assembly is arranged on the side wall of the power distribution box body, the side ventilation assembly is composed of an air inlet housing and an adjustable air door, and a temperature sensing part is fixedly connected to the interior of the power distribution box body and used for controlling the air door. The side face ventilation assembly is designed, meanwhile, the temperature sensing component is arranged, through cooperative use of the side face ventilation assembly and the temperature sensing component, the air door can be automatically driven to be adjusted at the high temperature, the side face air inlet amount is increased, and therefore external cold air can be effectively and directly guided to the middle; therefore, the problem that the temperature of the upper middle area is too high is effectively solved, meanwhile, the air volume can be automatically reduced to be closed at the low temperature and after work is stopped, and therefore the problem that external dust continuously enters the interior through the side face air inlet to cause pollution can be avoided.

Description

A type of distribution box Technical Field

[0001] This application relates to the field of distribution box technology, and in particular to a distribution box. Background Technology

[0002] As the core equipment for power distribution and control, distribution boxes are widely used in industrial, commercial and infrastructure fields. They typically contain electrical components such as circuit breakers, contactors, relays and terminals.

[0003] For electrical distribution boxes operating for extended periods, the internal electrical components require cooling. Currently, the most common cooling method for distribution boxes is a natural or forced convection heat transfer mode with "bottom intake and top exhaust." Specifically, cool air enters through the air intake at the bottom of the cabinet, flows through the internal heating elements, absorbs heat, and becomes hot air. Due to its lower density, hot air rises naturally and is eventually exhausted through the exhaust vents or exhaust fan at the top of the cabinet. This bottom-up airflow organization utilizes the principle of hot air rising, is simple in design, and is the most widely used cooling solution.

[0004] However, during prolonged use, this heat dissipation method results in a gradual increase in temperature as the cool air entering from the bottom is gradually heated by the electrical components along its upward flow. By the time the airflow reaches the upper part of the cabinet—typically the area with concentrated heat sources such as control switches and high-current terminals—the air temperature itself has risen significantly, drastically reducing its heat-carrying capacity and leading to poor cooling of critical components in this area. Consequently, heat accumulates in this region, forming localized "hot spots" where the temperature rise is much higher than the average temperature rise within the cabinet. This uneven temperature distribution significantly shortens the lifespan of components in this area and poses a safety hazard.

[0005] In other words, existing technologies have the following technical problems: ordinary distribution boxes are prone to poor heat dissipation in the upper and middle areas during long-term operation. Therefore, a new type of distribution box is proposed to address the above problems. Summary of the Invention

[0006] This embodiment provides a distribution box to solve the problem of poor heat dissipation in the upper and middle areas of ordinary distribution boxes in the prior art during long-term operation.

[0007] According to one aspect of this application, a distribution box is provided, comprising:

[0008] The main body of the distribution box has a control switch fixedly installed inside and a terminal block fixedly connected inside. The control switch and the terminal block are electrically connected. The upper part of the distribution box has an exhaust vent for hot air to be discharged, and the bottom of the distribution box has an air inlet for cold air to enter.

[0009] The side wall of the main body of the distribution box is also provided with a side ventilation component, which consists of an air inlet cover and an adjustable damper.

[0010] A temperature sensing component is fixedly connected inside the main body of the distribution box. The temperature sensing component consists of a fixed cylinder and a movable piston. The fixed cylinder is filled with a thermally expanding liquid. The movable piston is connected to the side ventilation assembly through a linkage structure to control the damper. In a high-temperature state, the damper adjusts to increase the air volume, and in a low-temperature state, the damper adjusts to decrease the air volume until it is closed.

[0011] Furthermore, the main body of the distribution box is composed of a rear shell and a front panel. A switch fixing plate is also fixedly connected in the inner cavity of the rear shell, and the switch fixing plate is used to support and fix the control switch.

[0012] Furthermore, the air inlet cover is fixedly installed on the side wall of the main body of the distribution box, and a rotating rod is fixedly connected to the center of the air damper. The rotating rod passes through the air inlet cover and is rotatably connected to the air inlet cover to form a rotatable adjustment structure.

[0013] Furthermore, the size of the damper matches the size of the air inlet of the air inlet cover, and an elastic sealing ring is fixedly connected to the outer edge of the damper.

[0014] Furthermore, the side ventilation assembly is also equipped with a filter structure, which consists of a filter screen and a vibration component. The filter screen is installed in the inner cavity of the air inlet hood to intercept dust particles and other foreign matter in the external gas.

[0015] Furthermore, a limiting ring is fixedly connected to the outer ring of the filter screen, and a guide slider is fixedly connected to the arc-shaped wall of the limiting ring. Several guide sliders are provided, and a through groove is provided on the air inlet cover to cooperate with the guide slider. The guide slider is located in the through groove of the air inlet cover and slides with the air inlet cover.

[0016] Furthermore, the vibrating component includes:

[0017] A spring is fixedly connected to the side of the limiting ring, and a fixing block is fixedly connected to one end of the spring. One end of the fixing block is fixedly connected to the inner wall of the air inlet cover, so that the filter screen forms a movable spring structure.

[0018] A contact rod fixed to the side wall of the guide slider;

[0019] A disc is fixedly connected to the bottom end of the rotating rod. The disc has several protrusions on its arc-shaped wall, and the protrusions are arranged in a ring array.

[0020] Furthermore, a movable piston is slidably connected in the inner cavity of the fixed cylinder, and one end of a movable guide rod is fixedly connected to one side wall of the movable piston. The inner cavity of the fixed cylinder is filled with a thermally expanding liquid.

[0021] Furthermore, the linkage structure consists of a connecting rod and an eccentric cam. One end of a connecting rod is fixedly connected to the center of the eccentric cam, and the other end of the connecting rod is fixedly connected to the top of the damper. One end of a connecting rod is rotatably connected to the side of the eccentric cam, and the other end of the connecting rod is rotatably connected to a foot bracket. The foot bracket is fixedly connected to one end of a moving guide rod.

[0022] Furthermore, the linkage structure consists of a gear and a rack. A connecting rod is fixedly connected to the center of the gear. One end of the connecting rod is fixedly connected to the top of the damper. A connecting seat is fixedly connected to one end of the rack. The connecting seat is fixedly connected to one end of the moving guide rod.

[0023] In order to solve the problem in the prior art where, during long-term operation, ordinary distribution boxes dissipate heat by means of bottom air intake and top air exhaust, causing hot air to accumulate at the top, resulting in excessive temperature rise in the upper and middle areas of the cabinet and forming local hot spots, thus affecting its lifespan, this application designs a side ventilation component and also sets up a temperature sensing component. Through the combined use of the side ventilation component and the temperature sensing component, the air damper can be automatically driven to adjust at high temperatures, increasing the side air intake volume. This effectively guides external cold air directly to the middle and blows it away from the heat source in the middle, thereby effectively solving the problem of excessive temperature in the upper and middle areas. At the same time, it can automatically reduce the air volume to the point of closure at low temperatures and after stopping operation, thus preventing external dust from continuously entering the interior through the side air intake and causing pollution. Compared with a simple side air intake, it realizes the function of automatic adjustment, ensuring air intake at high temperatures and automatically closing after stopping operation at low temperatures. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the overall structure of an embodiment of this application;

[0026] Figure 2 is a schematic diagram of the bottom structure of one embodiment of this application;

[0027] Figure 3 is a schematic diagram of the front structure of the front panel according to an embodiment of this application;

[0028] Figure 4 is a schematic diagram of the internal structure of the main body of the distribution box according to an embodiment of this application;

[0029] Figure 5 is a schematic diagram of the structure of the rear housing according to an embodiment of this application;

[0030] Figure 6 is a front view of the rear housing according to an embodiment of this application;

[0031] Figure 7 is a partially enlarged structural schematic diagram of section A in Figure 5 according to an embodiment of this application;

[0032] Figure 8 is a front view of a side ventilation assembly according to an embodiment of this application;

[0033] Figure 9 is a structural schematic diagram of Embodiment 1 of the side ventilation assembly of this application;

[0034] Figure 10 is a structural schematic diagram of Embodiment 2 of the side ventilation assembly of this application;

[0035] Figure 11 is a schematic diagram of the internal structure of a filter structure according to an embodiment of this application;

[0036] Figure 12 is a schematic diagram of the bottom surface structure of a filter structure according to an embodiment of this application;

[0037] Figure 13 is a schematic diagram of the structure of a temperature sensing component according to an embodiment of this application;

[0038] Figure 14 is a schematic diagram of the internal structure of a temperature sensing component according to an embodiment of this application;

[0039] Figure 15 is a schematic diagram of Embodiment 1 of the linkage structure of this application;

[0040] Figure 16 is a schematic diagram of Embodiment 2 of the linkage structure of this application.

[0041] In the diagram: 1. Main body of the distribution box; 101. Rear housing; 102. Front panel; 104. Exhaust vent; 105. Air inlet; 106. Switch mounting bracket; 2. Control switch; 3. Terminal block; 4. Side ventilation assembly; 401. Air inlet cover; 4011. Circular air inlet cover; 4012. Rectangular air inlet cover; 402. Air damper; 4021. Circular air damper; 4022. Rectangular air damper; 403. Rotating rod; 404. Elastic sealing ring; 5. Filter structure; 501. Limiting ring; 502. Filter screen, 503, fixing block, 504, spring, 505, guide slider, 506, contact rod, 507, disc, 508, protrusion, 6, temperature sensing component, 601, storage shell, 602, fixed cylinder, 603, moving piston, 604, moving guide rod, 605, heat-conducting fins, 606, thermally expanding liquid, 7, linkage structure, 701, connecting rod, 702, eccentric cam, 703, connecting rod, 704, foot, 705, gear, 706, rack, 707, connecting seat. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0043] Please refer to Figure 1-2, a distribution box includes:

[0044] The distribution box body 1 has a control switch 2 fixedly installed inside it, and a terminal block 3 fixedly connected inside it. The control switch 2 and the terminal block 3 are electrically connected. The upper part of the distribution box body 1 is provided with an exhaust hole 104 for hot air to be discharged, and the bottom of the distribution box body 1 is provided with an air inlet 105 for cold air to enter.

[0045] The side wall of the main body 1 of the distribution box is also provided with a side ventilation component 4, which consists of an air inlet cover 401 and an adjustable damper 402.

[0046] A temperature sensing component 6 is fixedly connected inside the main body 1 of the distribution box. The temperature sensing component 6 consists of a fixed cylinder 602 and a movable piston 603. The fixed cylinder 602 is filled with a thermally expanding liquid 606. The movable piston 603 is connected to the side ventilation component 4 through a linkage structure 7 and is used to control the damper 402. In a high-temperature state, the damper 402 adjusts to increase the air volume, and in a low-temperature state, the damper 402 adjusts to decrease the air volume until it is closed.

[0047] To address the problem in existing electrical distribution boxes where, during prolonged operation, hot air accumulates at the top, causing excessive temperature rise in the upper and middle areas of the cabinet and creating localized hotspots that affect its lifespan, this application designs a side ventilation component 4 and incorporates a temperature sensing component 6. Through the combined use of the side ventilation component 4 and the temperature sensing component 6, the damper 402 can be automatically adjusted at high temperatures to increase the side air intake. This effectively guides external cool air directly to the middle section, blowing away the heat source and thus effectively solving the problem of excessive temperature in the upper and middle areas. Simultaneously, at low temperatures and after operation ceases, the airflow can be automatically reduced to a closed state, preventing external dust from continuously entering the interior through the side air intake and causing pollution. Compared to a simple side air intake, this design achieves automatic adjustment, ensuring air intake at high temperatures while automatically closing after operation ceases at low temperatures.

[0048] Please refer to Figures 3 and 4. The main body 1 of the distribution box is composed of a rear shell 101 and a front panel 102. A switch fixing plate 106 is also fixedly connected in the inner cavity of the rear shell 101. The switch fixing plate 106 is used to support and fix the control switch 2. Preferably, the switch fixing plate 106 is also provided with a slide rail. The control switch 2 is provided with a slide groove that cooperates with the slide rail, so that it can be slidably connected to the switch fixing plate 106 and fixed by bolts.

[0049] Furthermore, an exhaust fan is fixedly installed in the upper part of the inner cavity of the rear housing 101 to achieve a "bottom air intake - top air exhaust" heat dissipation function. This is a common heat dissipation method in distribution boxes. After entering from the bottom, cold air flows upward through the heating elements, continuously absorbing heat and cooling them along the way. The air itself is heated and continues to rise, eventually being discharged from the top. This ensures that the cold air has the most sufficient and longest contact path with the heat source, maximizing heat exchange efficiency. However, this common heat dissipation method also has certain shortcomings. Cold air enters from the bottom and is gradually heated as it flows upward. When it reaches the area where the heat source is most concentrated in the middle, its cooling capacity has decreased, resulting in poor cooling effect on the components in the upper and middle parts, and easily forming local high temperature points.

[0050] Please refer to Figures 4, 5, and 6. The air inlet cover 401 is fixedly installed on the side wall of the main body 1 of the distribution box, and is located in the middle of the main body 1. A rotating rod 403 is fixedly connected to the center of the damper 402. The rotating rod 403 passes through the air inlet cover 401 and is rotatably connected to the air inlet cover 401 to form a rotatable adjustment structure. The rotation of the rotating rod 403 can drive the damper 402 to rotate, thereby adjusting the angle between the damper 402 and the air inlet of the air inlet cover 401. Specifically, the angle refers to the angle between the plate surface of the damper 402 and the ventilation plane of the air inlet cover 401. When the angle is 0°, the plate surface of the damper 402 is completely parallel to the ventilation plane. At this time, the damper 402 covers the ventilation opening, the ventilation area is minimal, and the air intake is also minimal. When the angle is 90°, the plate surface of the damper 402 is completely perpendicular to the ventilation plane. At this point, damper 402 provides maximum airflow, maximizing ventilation area and air intake. When the angle is between 0° and 90°, the vent is partially opened, and the air intake increases with the angle. By controlling the angle, the air intake can be adjusted. In areas with high temperatures in the middle section, the vent is enlarged to allow sufficient external cool air to enter, achieving cooling by directly introducing cool air into the middle section. This addresses the problem of insufficient cooling in the upper and middle sections caused by conventional "bottom intake - top exhaust" heat dissipation methods.

[0051] Please refer to Figures 7 and 8;

[0052] Preferably, the size of the damper 402 matches the size of the air inlet of the air inlet cover 401, and an elastic sealing ring 404 is fixedly connected to the outer edge of the damper 402. The elastic sealing ring 404 is made of silicone rubber and is resistant to temperatures from -40°C to 200°C. When the damper 402 is closed, the elastic sealing ring 404 can fill and seal the gap between the damper 402 and the air inlet cover 401, thereby effectively providing a sealing and protection function. After the distribution box stops working, it effectively reduces the condensation caused by external humid gas entering the cabinet.

[0053] Example 1 of side ventilation component 4:

[0054] Please refer to Figure 9; the side ventilation assembly 4 is composed of a circular air inlet shell 4011 and a circular air damper 4021. The circular air damper 4021 is fixedly mounted on a rotating rod 403. The rotating rod 403 passes through the circular air inlet shell 4011 and is rotatably connected to the circular air inlet shell 4011.

[0055] Example 2 of the side ventilation component 4:

[0056] Please refer to Figure 10; The side ventilation assembly 4 is composed of a rectangular air inlet shell 4012 and a rectangular air damper 4022. The rectangular air damper 4022 is fixedly mounted on a rotating rod 403. The rotating rod 403 passes through the rectangular air inlet shell 4012 and is rotatably connected to the rectangular air inlet shell 4012.

[0057] Please refer to Figures 11 and 12; to avoid the problem that external dust can enter the cabinet without obstruction due to side air intake;

[0058] The side ventilation assembly 4 also includes a filter structure 5, which consists of a filter screen 502 and a vibration component. The filter screen 502 is located inside the air inlet hood 401 and is used to intercept dust particles and other foreign matter in the external air. Preferably, the filter screen 502 is made of stainless steel wire mesh or nylon mesh with a mesh size of 50-100 mesh to balance air permeability and filtration effect.

[0059] A limiting ring 501 is fixedly connected to the outer ring of the filter 502. A guide slider 505 is fixedly connected to the arc-shaped wall of the limiting ring 501. Several guide sliders 505 are provided and are fixed at equal intervals on the outer wall of the limiting ring 501. The air inlet cover 401 is provided with a through groove that cooperates with the guide slider 505. The guide slider 505 is disposed in the through groove of the air inlet cover 401 and slides with the air inlet cover 401.

[0060] The vibrating component includes:

[0061] A spring 504 is fixedly connected to the side of the limiting ring 501. One end of the spring 504 is fixedly connected to a fixing block 503. One end of the fixing block 503 is fixedly connected to the inner wall of the air inlet cover 401, so that the filter screen 502 forms a movable spring structure.

[0062] Contact rod 506 fixed to the side wall of guide slider 505;

[0063] A disc 507 is fixedly connected to the bottom end of the rotating rod 403. The disc 507 has several protrusions 508 on its arc-shaped wall, arranged in a circular array. One end of the contact rod 506 extends to one of the protrusions 508, and this end is arc-shaped. Through this technical solution, when the rotating rod 403 rotates to adjust the opening and closing size of the damper 402, it automatically drives the disc 507 to rotate. The rotation of the disc 507 causes the protrusions 508 to rotate, and the rotating protrusions 508 can contact the contact rod 506, pushing... The moving contact rod 506 moves, thereby driving the guide slider 505 to move, which in turn causes the limiting ring 501 to move. At this time, the spring 504 contracts and accumulates elastic potential energy. As the protrusion 508 rotates, it separates from the contact rod 506. At this time, the elastic potential energy accumulated by the spring 504 is released, causing the limiting ring 501 to rebound and vibrate. This vibration can dislodge some of the dust and foreign objects attached to the filter screen 502, thereby avoiding blockage caused by long-term interception and avoiding affecting the air intake. Through the setting of the filter structure 5, the automatic vibration cleaning function can be achieved when the damper 402 is adjusted.

[0064] It should be emphasized that the filter structure 5 can effectively alleviate clogging and ensure air intake, but it still needs to be cleaned regularly. It is recommended to clean it every 3-6 months. The cleaning interval can be appropriately extended depending on the usage environment and dust concentration. Clean the dust and foreign objects attached to the filter screen 502 and clean the foreign objects that have fallen off due to vibration.

[0065] Please refer to Figures 13 and 14; a movable piston 603 is slidably connected in the inner cavity of the fixed cylinder 602, and one end of a movable guide rod 604 is fixedly connected to one side wall of the movable piston 603. The other end of the movable guide rod 604 passes through one side wall of the fixed cylinder 602 and extends outside the wall. One end of the movable guide rod 604 passes through the side wall of the distribution box body 1 and slides with the distribution box body 1. The inner cavity of the fixed cylinder 602 is filled with a thermally expanding liquid 606.

[0066] Preferably, the thermally expanding liquid 606 is one of ethylene glycol aqueous solution, silicone oil or toluene, and its coefficient of thermal expansion is in the range of 0.001 to 0.01 / ℃, preferably 0.005 / ℃, to ensure a significant volume change response within the common operating temperature range of the distribution box.

[0067] Furthermore, a sealing ring is provided between the movable piston 603 and the inner wall of the fixed cylinder 602. The sealing ring is made of high-temperature resistant fluororubber to ensure that the thermally expanding liquid 606 does not leak.

[0068] A storage shell 601 is also fixedly connected to one end of the fixed cylinder 602. The inner cavity of the storage shell 601 is interconnected with the inner cavity of the fixed cylinder 602. The inner cavity of the storage shell 601 is filled with a thermally expanding liquid 606. A heat-conducting fin 605 is fixedly connected to the arc-shaped outer wall of the storage shell 601. Several heat-conducting fins 605 are provided and are fixed in a ring array on the arc-shaped outer wall of the storage shell 601. Both the storage shell 601 and the fixed cylinder 602 are made of heat-conducting metal material, preferably copper or aluminum alloy. With this technical solution, by setting up the storage shell 601, when the temperature inside the cabinet rises, the internal thermal expansion liquid 606 expands, which in turn pushes the moving piston 603 to move. The movement of the moving piston 603 then drives the moving guide rod 604 to move. When the temperature of the storage shell 601 decreases, the internal thermal expansion liquid 606 contracts, which in turn drives the moving piston 603 to move in the opposite direction, causing the moving guide rod 604 to move in the opposite direction.

[0069] Preferably, the storage shell 601 of the temperature sensing component 6 is installed in the upper middle part of the area where the heating elements are concentrated in the distribution box, so as to more accurately sense the temperature of the hot spot.

[0070] Furthermore, the number of the side ventilation components 4 can be two or four, symmetrically arranged on both sides of the distribution box to enhance the uniformity of heat dissipation.

[0071] Example 1 of linkage structure 7:

[0072] Please refer to Figure 15. The linkage structure 7 consists of a connecting rod 703 and an eccentric cam 702. One end of a connecting rod 701 is fixedly connected to the center of the eccentric cam 702, and the other end of the connecting rod 701 is fixedly connected to the top of the damper 402. One end of the connecting rod 703 is rotatably connected to the side of the eccentric cam 702, and the other end of the connecting rod 703 is rotatably connected to a bracket 704. The bracket 704 is fixedly connected to one end of a moving guide rod 604. With this technical solution, when the temperature rises, the moving guide rod 604 moves, which can push the connecting rod 703 to move, thereby driving the eccentric cam 702 to rotate, which in turn drives the connecting rod 701 to rotate, causing the damper 402 to rotate, which in turn drives the rotating rod 403 to rotate, thus achieving the function of adjusting the air intake. Conversely, when the temperature drops, the moving guide rod 604 moves in the opposite direction, which can also cause the rotating rod 403 to rotate in the opposite direction, reducing the air intake and finally achieving complete sealing.

[0073] Example 2 of linkage structure 7:

[0074] Please refer to Figure 16. The linkage structure 7 consists of a gear 705 and a rack 706. A connecting rod 701 is fixedly connected to the center of the gear 705. One end of the connecting rod 701 is fixedly connected to the top of the damper 402. One end of the rack 706 is fixedly connected to a connecting seat 707. The connecting seat 707 is fixedly connected to one end of the moving guide rod 604. With this technical solution, when the temperature rises and the moving guide rod 604 moves, it can drive the rack 706 to move, thereby causing the gear 705 to rotate. The rotation of the gear 705 can drive the connecting rod 701 to rotate, which in turn causes the damper 402 to rotate, causing the rotating rod 403 to rotate to adjust the air intake. Conversely, when the temperature drops, the rack 706 moves in the opposite direction, causing the rotating rod 403 to rotate in the opposite direction, thereby reducing the air intake and finally achieving complete sealing.

[0075] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this application does not involve any improvement to the software and methods.

[0076] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A distribution box, comprising: The distribution box body (1) has a control switch (2) fixedly installed inside it, and a terminal block (3) fixedly connected inside it. The control switch (2) and the terminal block (3) are electrically connected. The upper part of the distribution box body (1) is provided with an exhaust hole (104) for hot air to be discharged, and the bottom of the distribution box body (1) is provided with an air inlet hole (105) for cold air to enter. The characteristic feature is that a side ventilation assembly (4) is also provided on the side wall of the distribution box body (1). The side ventilation assembly (4) consists of an air inlet cover (401). It consists of an adjustable damper (402); a temperature sensing component (6) is fixedly connected inside the main body (1) of the distribution box. The temperature sensing component (6) consists of a fixed cylinder (602) and a movable piston (603). The fixed cylinder (602) is also filled with a thermal expansion liquid (606). The movable piston (603) is connected to the side ventilation assembly (4) through a linkage structure (7) to control the damper (402). In a high temperature state, the damper (402) adjusts to increase the air volume. In a low temperature state, the damper (402) adjusts to decrease the air volume until it is closed.

2. The distribution box according to claim 1, characterized in that: The main body (1) of the distribution box is composed of a rear shell (101) and a front panel (102). A switch fixing plate (106) is also fixedly connected in the inner cavity of the rear shell (101). The switch fixing plate (106) is used to support and fix the control switch (2).

3. The distribution box according to claim 1, characterized in that: The air inlet cover (401) is fixedly installed on the side wall of the main body (1) of the distribution box. A rotating rod (403) is fixedly connected to the center of the air damper (402). The rotating rod (403) passes through the air inlet cover (401) and is rotatably connected to the air inlet cover (401) to form a rotatable adjustment structure.

4. The distribution box according to claim 3, characterized in that: The size of the damper (402) matches the size of the air inlet of the air inlet cover (401), and an elastic sealing ring (404) is fixedly connected to the outer edge of the damper (402).

5. The distribution box according to claim 3 or 4, characterized in that: The side ventilation assembly (4) is also provided with a filter structure (5), which consists of a filter screen (502) and a vibration component. The filter screen (502) is located in the inner cavity of the air inlet cover (401) and is used to intercept dust and foreign particles in the external gas.

6. The distribution box according to claim 5, characterized in that: A limiting ring (501) is fixedly connected to the outer ring of the filter (502), and a guide slider (505) is fixedly connected to the arc-shaped wall of the limiting ring (501). Several guide sliders (505) are provided.

7. The distribution box according to claim 5, characterized in that: The vibration component includes: a spring (504) fixedly connected to the side of the limiting ring (501), one end of the spring (504) being fixedly connected to a fixing block (503), one end of the fixing block (503) being fixedly connected to the inner wall of the air inlet cover (401), so that the filter (502) forms a movable spring structure; a contact rod (506) fixed to the side wall of the guide slider (505); and a disc (507) fixedly connected to the bottom end of the rotating rod (403), wherein the disc (507) has a plurality of protrusions (508) on its arc-shaped wall, and the plurality of protrusions (508) are arranged in a ring array.

8. The distribution box according to claim 1, characterized in that: A movable piston (603) is slidably connected in the inner cavity of the fixed cylinder (602). One end of a movable guide rod (604) is fixedly connected to one side wall of the movable piston (603). The inner cavity of the fixed cylinder (602) is filled with a thermally expanding liquid (606). A storage shell (601) is also fixedly connected to one end of the fixed cylinder (602). The inner cavity of the storage shell (601) is interconnected with the inner cavity of the fixed cylinder (602). The inner cavity of the storage shell (601) is filled with a thermally expanding liquid (606).

9. The distribution box according to claim 1, characterized in that: The linkage structure (7) consists of a connecting rod (703) and an eccentric cam (702). One end of a connecting rod (701) is fixedly connected to the center of the eccentric cam (702). The other end of the connecting rod (701) is fixedly connected to the top of the damper (402). One end of a connecting rod (703) is rotatably connected to the side of the eccentric cam (702). The other end of the connecting rod (703) is rotatably connected to a stand (704). The stand (704) is fixedly connected to one end of a moving guide rod (604).

10. The distribution box according to claim 1, characterized in that: The linkage structure (7) is composed of a gear (705) and a rack (706). A connecting rod (701) is fixedly connected to the center of the gear (705). One end of the connecting rod (701) is fixedly connected to the top of the damper (402). One end of the rack (706) is fixedly connected to a connecting seat (707). The connecting seat (707) is fixedly connected to one end of the moving guide rod (604).

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