Safe explosion-proof high-low voltage distribution box

Abstract

The invention discloses a safe explosion-proof high-low voltage distribution box, and belongs to the field of power equipment, the safe explosion-proof high-low voltage distribution box comprises a box body, the lower end of the inner surface of the box body is fixedly connected with a fixing sleeve, the outer surface of the upper end of the fixing sleeve is fixedly connected with a supporting plate, the supporting plate is fixedly connected with the inner surface of the box body, and the inner surface of the fixing sleeve is provided with a speed regulation assembly. The speed adjusting assembly comprises a limiting plate fixedly connected with the inner surface of the fixing sleeve, and a movable part is arranged on the outer surface of the limiting plate. By arranging the speed adjusting assembly, the gap between the turning plate and the fixing sleeve can be gradually reduced through rotation of the turning plate, and when the air inflow in the box body is kept constant, the flowing speed of air can be increased through reduction of the gap, so that the ventilation and heat dissipation effects of the air on the interior of the box body can be improved, the risk that the temperature in the box body is too high can be reduced, and the service life of the box body is prolonged. And the flowing speed of the gas can be matched with the temperature in the box body, so that the stability of the distribution box in the working process can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of electric power equipment, and more particularly to a safe and explosion-proof high and low voltage distribution box. Background Art

[0002] High and low voltage distribution boxes are important components in power systems for distributing electrical energy and controlling electrical equipment. They play a vital role in power systems of different voltage levels and demonstrate significant advantages in safety performance, operational stability, and protection functions. They not only ensure the stable operation of the power system, but also effectively protect the safety of operators and equipment.

[0003] High and low voltage distribution boxes generate heat during operation. If the heat is not dissipated in time, it will affect the performance and service life of electrical components. Therefore, effective heat dissipation measures are required to ensure its normal operation. Common heat dissipation methods include natural ventilation and mechanical ventilation. For example, the Chinese patent with announcement number CN117394182B discloses a dust-proof and ventilated distribution box. This device is equipped with a filter replacement and cleaning unit on both the air inlet and outlet ducts, which can clean the replaced No. 1 filter, thereby achieving cleaning of the filter while reducing the entry of impurities, while ensuring good ventilation of the distribution box.

[0004] Existing distribution boxes usually use fans for heat dissipation when working, using the flow of air to take away the heat inside the distribution box. However, in actual operation, when the external ambient temperature of the distribution box changes, it will affect the heat dissipation effect inside the distribution box. In addition, when using fans for heat dissipation, the ventilation volume inside the distribution box is usually kept constant. When the external ambient temperature is too high, the heat dissipation inside the distribution box will not be timely, so that the temperature inside the distribution box will gradually increase, which will also have an adverse effect on the service life and operational stability of the electrical components inside the distribution box. Summary of the Invention

[0005] In response to the problems existing in the prior art, the purpose of the present invention is to provide a safe and explosion-proof high and low voltage distribution box. By setting a speed regulating component, the gap between the flap and the fixed sleeve will gradually become smaller through the rotation of the flap. When the air intake inside the box is kept constant, the smaller the gap, the faster the flow rate of the gas will be. This can improve the ventilation and heat dissipation effect of the gas on the inside of the box, help reduce the risk of excessive temperature inside the box, and make the gas flow rate match the temperature inside the box, thereby effectively improving the stability of the distribution box during operation.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A safety explosion-proof high and low voltage distribution box, including a box body, a fixed sleeve is fixedly connected to the lower end of the inner surface of the box body, a support plate is fixedly connected to the outer surface of the upper end of the fixed sleeve, the support plate is fixedly connected to the inner surface of the box body, and a speed regulation component is arranged on the inner surface of the fixed sleeve; The speed regulation component includes a limiting plate fixedly connected to the inner surface of the fixed sleeve, a movable part is arranged on the outer surface of the limiting plate, the limiting plate is rotatably connected with a flap through the movable part, a metal sheet is fixedly connected to the outer surface of the lower end of the flap, and the outer surface of the lower end of the metal sheet is fixedly connected to the upper end of the inner surface of the fixed sleeve.

[0008] Further, the movable part includes a mounting groove opened on the outer surface of the limiting plate, a pin shaft is fixedly connected to the inner surface of the mounting groove, the outer surface of the pin shaft is rotatably connected with a flap, the number of the pin shafts and the flaps is two groups and they are symmetrically distributed, the flap is in a semi-circular structure, the metal sheet is in a U-shaped structure, and the support plate is in an L-shaped structure.

[0009] Further, a ventilation component is arranged inside the box body, the ventilation component includes a motor fixedly connected to the inner surface of the box body, a first rotating shaft is fixedly connected to the upper end of the output shaft of the motor, a paddle is fixedly connected to the outer surface of the first rotating shaft, the number of the paddles is several groups and they are distributed in a circular array, the motor and the first rotating shaft are both located inside the fixed sleeve, a notch is opened on the outer surface of the fixed sleeve, and the number of the notches is several groups and they are distributed in a circular array.

[0010] Further, baffles are symmetrically and fixedly connected to the left and right ends of the outer surface of the box body, air outlet grooves are symmetrically opened on the left and right ends of the outer surface of the box body, the upper end outer surface of the baffle is in an arc shape, and the number of the air outlet grooves is several groups and they are distributed in a linear array.

[0011] Further, ventilation seats are fixedly connected to the left and right ends of the outer surface of the box body, the inside of the ventilation seats is hollow, air inlet grooves are opened on the outer surface of the ventilation seats and are distributed in parallel, a placement groove is opened on the outer surface of the box body inside the ventilation seats, a filter screen is fixedly connected to the inner surface of the placement groove, a flow blocking plate is fixedly connected to the upper end of the inner surface of the ventilation seats, the ventilation seats are located below the baffles, and the lower end of the ventilation seats is in an open shape.

[0012] Further, a sealing component is arranged inside the fixed sleeve, the sealing component includes a second guiding groove opened on the inner surface of the fixed sleeve, a sealing plate is slidably connected to the inner surface of the second guiding groove, the sealing plate is in a circular ring shape, a fixing rod is fixedly connected to the outer surface of the lower end of the limiting plate, and a connecting rod is fixedly connected to the lower end of the fixing rod, and the connecting rod is in a circular ring shape.

[0013] Further, a first guiding groove is embedded in the inner surface of the second guiding groove. A guiding block is slidably connected to the inner surface of the first guiding groove. The outer surface of the guiding block is fixedly connected to a sealing plate. The number of the first guiding grooves and the guiding blocks is two groups, which are symmetrically distributed on both sides of the second rotating shaft. A second towing rope is fixedly connected to the upper outer surface of the sealing plate. The upper end of the second towing rope is fixedly connected to the lower outer surface of the flap.

[0014] Further, a flow disturbing component is arranged above the limiting plate. The flow disturbing component includes a second rotating shaft fixedly connected to the upper end of the first rotating shaft. The upper part of the second rotating shaft penetrates above the limiting plate and is rotatably connected to the limiting plate. A flow disturbing plate is fixedly connected to the outer surface of the second rotating shaft. The flow disturbing plate is made of a moisture-absorbing material.

[0015] Further, a moisture-absorbing plate is fixedly connected to the upper outer surface of the supporting plate. The moisture-absorbing plate is in a circular ring shape. Through holes are formed in the upper outer surface of the moisture-absorbing plate. The flow disturbing plate is located inside the moisture-absorbing plate. The number of the flow disturbing plates is several groups and is distributed in a circular array. A first towing rope is fixedly connected to the upper outer surface of the flap. The upper end of the first towing rope is fixedly connected to the upper inner surface of the moisture-absorbing plate. The moisture-absorbing plate is made of an elastic material.

[0016] Further, a box door is hinged to the front outer surface of the box body. A mounting rack is fixedly connected to the rear end inner surface of the box body. A control element is fixedly connected to the outer surface of the mounting rack.

[0017] Compared with the prior art, the advantages of the present invention are as follows: (1) By setting the speed regulating component in this solution, as the flap rotates, the gap between the flap and the fixed sleeve will gradually become smaller. When the air intake volume inside the box body remains constant, the decrease in the gap will increase the flow rate of the gas, thereby improving the ventilation and heat dissipation effect of the gas on the inside of the box body, helping to reduce the risk of excessive temperature inside the box body, making the flow rate of the gas match the temperature inside the box body, and further effectively improving the stability during the operation of the distribution box. (2) By setting the flow disturbing component in this solution, not only can the gas entering the box body be disturbed to improve the heat dissipation effect on the control element, but also the moisture-absorbing plate and the flow disturbing plate can continuously absorb the moisture inside the box body, thereby reducing the damage of the moisture to the control elements inside the box body. (3) By setting the sealing component in this solution, not only can the air circulation be blocked to maintain the temperature inside the box body within an appropriate range, but also the dust entering the surface of the control element can be further reduced. Furthermore, the functional performance and reliability of the distribution box can be further improved. At the same time, the ventilation area of the notch can be gradually increased to allow external gas to enter the inside of the fixed sleeve, thereby improving the heat dissipation effect on the inside of the box body. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a top view of the overall structure of the present invention; Figure 3 is of the present invention Figure 2 sectional view taken along line A-A; Figure 4 is of the present invention Figure 2 sectional view taken along line B-B; Figure 5 is of the present invention Figure 3 enlarged view at C of the present invention; Figure 6 is of the present invention Figure 3 enlarged view at D of the present invention; Figure 7 is of the present invention Figure 4 enlarged view at E of the present invention.

[0019] Explanation of reference numerals in the figure: 11, box body; 12, ventilation seat; 13, box door; 14, baffle; 15, air outlet groove; 16, control element; 17, mounting bracket; 18, support plate; 19, fixing sleeve; 20, motor; 21, moisture absorption plate; 22, through hole; 23, spoiler; 24, limit plate; 25, mounting groove; 26, pin shaft; 27, flap; 28, first rotating shaft; 29, second rotating shaft; 30, first traction rope; 31, second traction rope; 32, metal sheet; 33, first guide groove; 34, guide block; 35, sealing plate; 36, second guide groove; 37, fixing rod; 38, connecting rod; 39, notch; 40, placement groove; 41, filter screen; 42, flow blocking plate; 43, air inlet groove; 44, blade. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1 to 7 , a safety explosion-proof high and low voltage distribution box, including a box body 11, a fixing sleeve 19 is fixedly connected to the lower end of the inner surface of the box body 11, a support plate 18 is fixedly connected to the outer surface of the upper end of the fixing sleeve 19, the support plate 18 is fixedly connected to the inner surface of the box body 11, and a speed regulation assembly is arranged on the inner surface of the fixing sleeve 19; The speed control component includes a limit plate 24 fixedly connected to the inner surface of the fixed sleeve 19. An activity part is arranged on the outer surface of the limit plate 24. The limit plate 24 is rotationally connected with a flap 27 through the activity part. A metal sheet 32 is fixedly connected to the outer surface of the lower end of the flap 27. The outer surface of the lower end of the metal sheet 32 is fixedly connected to the upper end of the inner surface of the fixed sleeve 19.

[0022] The activity part includes a mounting groove 25 opened on the outer surface of the limit plate 24. A pin shaft 26 is fixedly connected to the inner surface of the mounting groove 25. The outer surface of the pin shaft 26 is rotationally connected with the flap 27. The number of the pin shafts 26 and the flaps 27 is two groups and they are symmetrically distributed. The flap 27 is in a semi-circular structure. The metal sheet 32 is in a U-shaped structure. The support plate 18 is in an L-shaped structure.

[0023] A box door 13 is hinged to the outer surface of the front end of the box body 11. A mounting frame 17 is fixedly connected to the rear end of the inner surface of the box body 11. A control element 16 is fixedly connected to the outer surface of the mounting frame 17.

[0024] By adopting the above technical solution, when the distribution box is in use, the control element 16 is fixedly supported by the mounting frame 17 inside it. During the long-term operation of the control element 16, heat will be continuously generated. Therefore, it is necessary to ventilate and dissipate heat from the box body 11 during operation. During operation, external gas will enter the inside of the box body 11, and the heat inside the box body 11 can be discharged through the circulation of the gas. In order to make the flow rate of the gas inside the box body 11 match the temperature inside the box body 11, a speed control component is set. The support plate 18 seals the internal space of the box body 11, and the gas will flow upward through the fixed sleeve 19, and then flow upward between the fixed sleeve 19 and the flap 27. The fixed sleeve 19 fixedly supports the limit plate 24. The mounting groove 25 on the surface of the limit plate 24 is used for fixedly installing the pin shaft 26. The flap 27 will rotate with the pin shaft 26 as the fulcrum. The metal sheet 32 is composed of two metal sheets 32 with different coefficients of thermal expansion, and the coefficient of thermal expansion of the external metal sheet 32 is less than that of the internal metal sheet 32. When the temperature inside the box body 11 rises, the internal metal sheet 32 expands when heated and its bending amplitude gradually increases. At this time, the metal sheet 32 will pull the flap 27, so that the two flaps 27 will turn downward with the pin shaft 26 as the fulcrum. As the flap 27 gradually moves towards the fixed sleeve 19 side, the gap between the flap 27 and the fixed sleeve 19 will gradually become smaller. When the intake air volume inside the box body 11 remains constant, the decrease in the gap will make the flow rate of the gas increase, thereby improving the ventilation and heat dissipation effect of the gas on the inside of the box body 11, helping to reduce the risk of over-high temperature inside the box body 11, making the flow rate of the gas match the temperature inside the box body 11, and further effectively improving the stability of the distribution box during operation.

[0025] Such as Figure 1 AndFigure 4 As shown, an air exchange component is provided inside the box body 11. The air exchange component includes a motor 20 fixedly connected to the inner surface of the box body 11. The upper end of the output shaft of the motor 20 is fixedly connected to a first rotating shaft 28. A plurality of paddle blades 44 are fixedly connected to the outer surface of the first rotating shaft 28, and the number of the paddle blades 44 is several groups and is distributed in a circular array. The motor 20 and the first rotating shaft 28 are both located inside a fixed sleeve 19. A notch 39 is formed on the outer surface of the fixed sleeve 19, and the number of the notches 39 is several groups and is distributed in a circular array; Baffles 14 are symmetrically and fixedly connected to the left and right ends of the outer surface of the box body 11. Air outlet grooves 15 are symmetrically formed on the left and right ends of the outer surface of the box body 11. The upper outer surface of the baffle 14 is arc-shaped, and the number of the air outlet grooves 15 is several groups and is distributed in a linear array.

[0026] Air exchange seats 12 are fixedly connected to the left and right ends of the outer surface of the box body 11. The inside of the air exchange seats 12 is hollow. Intake grooves 43 are formed on the outer surface of the air exchange seats 12 and are distributed in parallel. A placement groove 40 is formed on the outer surface of the box body 11 inside the air exchange seats 12. A filter screen 41 is fixedly connected to the inner surface of the placement groove 40. A flow blocking plate 42 is fixedly connected to the upper end of the inner surface of the air exchange seats 12. The air exchange seats 12 are located below the baffles 14, and the lower ends of the air exchange seats 12 are open.

[0027] By adopting the above technical solution, when the box body 11 is ventilated and cooled, the motor 20 is started. At this time, the output shaft of the motor 20 will drive the first rotating shaft 28 to rotate synchronously, and the first rotating shaft 28 will drive the paddle blades 44 to rotate to send the gas upward. At this time, the external gas of the box body 11 will enter the inside of the air exchange seats 12 through the intake grooves 43, and then the gas will enter the inside of the support plate 18 through the filter screen 41. The flow blocking plate 42 inside the air exchange seats 12 will adsorb the dust and water vapor in the gas, so as to effectively reduce the dust in the gas from entering the inside of the box body 11, and further reduce the influence of dust on the heat dissipation effect of the control element 16. The lower end of the air exchange seats 12 is open, and the rainwater entering the inside of the air exchange seats 12 will flow downward along the surface of the flow blocking plate 42, so as to effectively reduce the probability of rainwater entering the inside of the box body 11; After the gas enters the inside of the box body 11, it will enter the inside of the fixed sleeve 19 through the notch 39 on the surface of the fixed sleeve 19 and flow upward under the blowing of the paddle blades 44. Then the gas is discharged from the air outlet grooves 15 on the surface of the box body 11 under the action of pressure. The baffle 14 above the air outlet grooves 15 can have a good blocking effect on rainwater. The gas will contact the surface of the control element 16 during the flowing process. The heat inside the box body 11 can be effectively taken away through the circulating flow of the gas, so that the temperature inside the box body 11 can be maintained within a lower range, and further improve the working stability of the distribution box.

[0028] AsFigure 4 and Figure 7 As shown in Figure 7 , a sealing component is arranged inside the fixed sleeve 19. The sealing component includes a second guiding groove 36 formed on the inner surface of the fixed sleeve 19. A sealing plate 35 is slidably connected to the inner surface of the second guiding groove 36. The sealing plate 35 is in an annular shape. A fixing rod 37 is fixedly connected to the outer surface of the lower end of the limiting plate 24. The lower end of the fixing rod 37 is fixedly connected to a connecting rod 38. The connecting rod 38 is in an annular shape.

[0029] A first guiding groove 33 is embedded in the inner surface of the second guiding groove 36. A guiding block 34 is slidably connected to the inner surface of the first guiding groove 33. The outer surface of the guiding block 34 is fixedly connected to the sealing plate 35. The number of the first guiding grooves 33 and the guiding blocks 34 is two groups and they are symmetrically distributed on both sides of the second rotating shaft 29. A second traction rope 31 is fixedly connected to the outer surface of the upper end of the sealing plate 35. The upper end of the second traction rope 31 is fixedly connected to the outer surface of the lower end of the flap 27.

[0030] By adopting the above technical solution, the flap 27 will drive the sealing component to start running during the movement. During work, when the flap 27 turns downward, the flap 27 drives the sealing plate 35 to move downward through the second traction rope 31. The second guiding groove 36 inside the fixed sleeve 19 will play a role of sliding guidance for the sealing plate 35. The first guiding groove 33 inside the second guiding groove 36 will guide the linear sliding of the guiding block 34 in the vertical direction, so that the sealing plate 35 can only slide downward inside the fixed sleeve 19. As the sealing plate 35 gradually moves downward, the sealing plate 35 will gradually disengage from the notch 39, so that the ventilation area of the notch 39 gradually increases, so that external gas can enter the inside of the fixed sleeve 19, thereby improving the heat dissipation effect of the inside of the box body 11. When the temperature inside the box body 11 is relatively low, the metal sheet 32 gradually turns into a straight line under the action of its own elastic force. At this time, the metal sheet 32 will push the flap 27 to turn upward. At this time, the flap 27 will pull the sealing plate 35 through the second traction rope 31, so that the sealing plate 35 gradually moves upward along the second guiding groove 36, and the notch 39 on the surface of the fixed sleeve 19 is sealed by the sealing plate 35, so that external gas can be prevented from entering the inside of the box body 11. By arranging the sealing component, the inside of the box body 11 can be sealed when the box body 11 does not need ventilation and heat dissipation, which can not only prevent the air from flowing and keep the temperature inside the box body 11 within an appropriate range, but also further reduce the dust from entering the surface of the control element 16, and further improve the functionality and reliability of the distribution box. The limiting plate 24 pulls and supports the connecting rod 38 through the fixing rod 37. The annular shape of the connecting rod 38 can block the second traction rope 31 and reduce the probability of the second traction rope 31 winding around the surface of the blade 44.

[0031] such as Figure 4 、 Figure 5 andFigure 6 As shown, a flow disturbing component is arranged on the upper side of the limit plate 24. The flow disturbing component includes a second rotating shaft 29 fixedly connected to the upper end of the first rotating shaft 28. The upper part of the second rotating shaft 29 penetrates to the upper side of the limit plate 24 and is rotatably connected to the limit plate 24. A flow disturbing plate 23 is fixedly connected to the outer surface of the second rotating shaft 29. The flow disturbing plate 23 is made of a moisture-absorbing material.

[0032] A moisture-absorbing plate 21 is fixedly connected to the outer surface of the upper end of the support plate 18. The moisture-absorbing plate 21 is annular. Through holes 22 are formed in the outer surface of the upper end of the moisture-absorbing plate 21. The flow disturbing plate 23 is located inside the moisture-absorbing plate 21. The number of the flow disturbing plates 23 is several groups and they are distributed in an annular array. A first towing rope 30 is fixedly connected to the outer surface of the upper end of the flap 27. The upper end of the first towing rope 30 is fixedly connected to the inner surface of the upper end of the moisture-absorbing plate 21. The moisture-absorbing plate 21 is made of an elastic material.

[0033] By adopting the above technical solution, during the rotation of the first rotating shaft 28, the flow disturbing component will be synchronously started. During operation, the first rotating shaft 28 will drive the second rotating shaft 29 to rotate synchronously, and the second rotating shaft 29 will drive the flow disturbing plate 23 to rotate synchronously. When the gas flows upward inside the fixed sleeve 19, it will enter the moisture-absorbing plate 21 and be discharged upward through the through holes 22 on the upper side of the moisture-absorbing plate 21. During the contact between the moisture-absorbing plate 21 and the air, the moisture in the air will be absorbed. The flow disturbing plate 23 can disturb the flow direction of the gas, so that the gas flows irregularly inside the box body 11, and then the gas can be in full contact with the surface of the control element 16 for ventilation and heat dissipation. At the same time, the flow disturbing plate 23 is made of a moisture-absorbing material and can absorb the moisture in the air, so that the moisture entering the box body 11 can be reduced. This can not only reduce the probability of condensation formed by moisture inside the box body 11, but also reduce the corrosion of metal electrical components. Moreover, during the flipping of the flap 27, the first towing rope 30 will be pulled, so that the moisture-absorbing plate 21 can generate a certain range of elastic deformation, thereby further changing the air flow direction. By arranging the flow disturbing component, not only can the gas entering the box body 11 be disturbed to improve the heat dissipation effect of the control element 16, but also the moisture-absorbing plate 21 and the flow disturbing plate 23 can continuously absorb the moisture inside the box body 11, and then the damage of the moisture to the control element 16 inside the box body 11 can be reduced.

[0034] Usage method: When the distribution box is working, the gas outside the box body 11 will enter the inside of the air exchange seat 12 through the air inlet groove 43, and then the gas will enter the inside of the support plate 18 after being preliminarily filtered and adsorbed by the filter screen 41. After the gas enters the inside of the box body 11, it will enter the inside of the fixed sleeve 19 through the notch 39 on the surface of the fixed sleeve 19 and flow upward under the blowing of the paddle 44. During the flowing process of the gas, it will come into contact with the surface of the control element 16. Through the circulating flow of the gas, the heat inside the box body 11 can be effectively taken away. When the temperature inside the box body 11 rises, the internal metal sheet 32 expands due to heat and its bending amplitude gradually increases. At this time, the metal sheet 32 will pull the flap 27, so that the two flaps 27 will rotate downward with the pin shaft 26 as the fulcrum, and the gap between the flap 27 and the fixed sleeve 19 will gradually become smaller, so that the flow rate of the gas can match the temperature inside the box body 11. When the temperature inside the box body 11 is relatively low, the notch 39 on the surface of the fixed sleeve 19 is sealed by the sealing plate 35, so as to prevent the external gas from entering the inside of the box body 11. During the contact with the air, the moisture absorption plate 21 will absorb the moisture in the air. The flow deflector 23 can disturb the flow direction of the gas, so that the gas flows irregularly inside the box body 11, so that the gas can fully contact the surface of the control element 16 to ventilate and dissipate heat from the control element 16.

[0035] The above is only a preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A safety explosion-proof high and low voltage distribution box, comprising a box body (11), characterized in that: A fixed sleeve (19) is fixedly connected to the lower end of the inner surface of the box body (11). A support plate (18) is fixedly connected to the outer surface of the upper end of the fixed sleeve (19). The support plate (18) is fixedly connected to the inner surface of the box body (11). A speed regulation component is arranged on the inner surface of the fixed sleeve (19). The speed regulation component includes a limit plate (24) fixedly connected to the inner surface of the fixed sleeve (19). An activity part is arranged on the outer surface of the limit plate (24). The limit plate (24) is rotationally connected to a flap (27) through the activity part. A metal sheet (32) is fixedly connected to the outer surface of the lower end of the flap (27). The outer surface of the lower end of the metal sheet (32) is fixedly connected to the upper end of the inner surface of the fixed sleeve (19).

2. The safety explosion-proof type high and low voltage distribution box according to claim 1, characterized in that: The activity part includes a mounting groove (25) opened on the outer surface of the limit plate (24). A pin shaft (26) is fixedly connected to the inner surface of the mounting groove (25). The flap (27) is rotationally connected to the outer surface of the pin shaft (26). The number of the pin shafts (26) and the flaps (27) is two groups and they are symmetrically distributed. The flap (27) is in a semi-circular structure. The metal sheet (32) is in a U-shaped structure. The support plate (18) is in an L-shaped structure.

3. The safety explosion-proof type high and low voltage distribution box according to claim 2, wherein: A ventilation component is arranged inside the box body (11). The ventilation component includes a motor (20) fixedly connected to the inner surface of the box body (11). A first rotating shaft (28) is fixedly connected to the upper end of the output shaft of the motor (20). A paddle (44) is fixedly connected to the outer surface of the first rotating shaft (28). The number of the paddles (44) is several groups and they are distributed in a circular array. The motor (20) and the first rotating shaft (28) are both located inside the fixed sleeve (19). A notch (39) is opened on the outer surface of the fixed sleeve (19). The number of the notches (39) is several groups and they are distributed in a circular array.

4. A safety explosion-proof type high and low voltage distribution box according to claim 3, characterized in that: Baffles (14) are symmetrically and fixedly connected to the left and right ends of the outer surface of the box body (11). Air outlet grooves (15) are symmetrically opened on the left and right ends of the outer surface of the box body (11). The upper outer surface of the baffle (14) is in an arc shape. The number of the air outlet grooves (15) is several groups and they are distributed in a linear array.

5. The safety explosion-proof type high and low voltage distribution box according to claim 4, characterized in that: Ventilation seats (12) are fixedly connected to the left and right ends of the outer surface of the box body (11). The inside of the ventilation seat (12) is hollow. Intake grooves (43) distributed in parallel are opened on the outer surface of the ventilation seat (12). A placement groove (40) is opened on the outer surface of the box body (11) inside the ventilation seat (12). A filter screen (41) is fixedly connected to the inner surface of the placement groove (40). A flow blocking plate (42) is fixedly connected to the upper end of the inner surface of the ventilation seat (12). The ventilation seat (12) is located below the baffle (14). The lower end of the ventilation seat (12) is in an open shape.

6. The safety explosion-proof type high and low voltage distribution box according to claim 5, characterized in that: A sealing assembly is provided inside the fixed sleeve (19). The sealing assembly includes a second guiding groove (36) formed on the inner surface of the fixed sleeve (19). A sealing plate (35) is slidably connected to the inner surface of the second guiding groove (36). The sealing plate (35) is annular. A fixing rod (37) is fixedly connected to the lower outer surface of the limiting plate (24). A connecting rod (38) is fixedly connected to the lower end of the fixing rod (37). The connecting rod (38) is annular.

7. The safety explosion-proof type high and low voltage distribution box according to claim 6, characterized in that: A first guiding groove (33) is embeddedly formed on the inner surface of the second guiding groove (36). A guiding block (34) is slidably connected to the inner surface of the first guiding groove (33). The outer surface of the guiding block (34) is fixedly connected to the sealing plate (35). The number of the first guiding grooves (33) and the guiding blocks (34) is two groups, and they are symmetrically distributed on both sides of the second rotating shaft (29). A second traction rope (31) is fixedly connected to the upper outer surface of the sealing plate (35). The upper end of the second traction rope (31) is fixedly connected to the lower outer surface of the flap (27).

8. The safety explosion-proof type high and low voltage distribution box according to claim 7, characterized in that: A flow disturbing assembly is arranged above the limiting plate (24). The flow disturbing assembly includes a second rotating shaft (29) fixedly connected to the upper end of the first rotating shaft (28). The upper part of the second rotating shaft (29) penetrates above the limiting plate (24) and is rotatably connected to the limiting plate (24). A flow disturbing plate (23) is fixedly connected to the outer surface of the second rotating shaft (29). The flow disturbing plate (23) is made of a moisture-absorbing material.

9. The safety explosion-proof type high and low voltage distribution box according to claim 8, characterized in that: A moisture-absorbing plate (21) is fixedly connected to the upper outer surface of the support plate (18). The moisture-absorbing plate (21) is annular. Through holes (22) are formed on the upper outer surface of the moisture-absorbing plate (21). The flow disturbing plate (23) is located inside the moisture-absorbing plate (21). The number of the flow disturbing plates (23) is several groups and they are distributed in an annular array. A first traction rope (30) is fixedly connected to the upper outer surface of the flap (27). The upper end of the first traction rope (30) is fixedly connected to the upper inner surface of the moisture-absorbing plate (21). The moisture-absorbing plate (21) is made of an elastic material.

10. A safety explosion-proof type high and low voltage distribution box according to claim 9, characterized in that: A box door (13) is hinged to the front outer surface of the box body (11). A mounting frame (17) is fixedly connected to the rear end inner surface of the box body (11). A control element (16) is fixedly connected to the outer surface of the mounting frame (17).

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