An explosion-proof distribution box for dust

Abstract

The present invention relates to the technical field of distribution boxes, and particularly to an explosion-proof distribution box for dust, which comprises an outer box body and a box door; it further comprises an inner box body, a fan, an air return port, a cable passing pipe and a heat dissipation structure. The inner box body is installed in the outer box body, a gap is provided between the outer wall of the inner box body and the inner wall of the outer box body, and the heat dissipation structure is installed in the gap between the outer box body and the inner box body. An air intake duct is arranged on the upper wall of the inner box body, and the air intake duct communicates with the upper gap between the inner box body and the outer box body. The fan is installed in the air intake duct of the inner box body. A plurality of air return ports are arranged on the lower wall of the inner box body, both the air intake duct and the air return ports communicate with the chamber two of the inner box body, and the air return ports communicate with the lower gap between the inner box body and the outer box body. The cable passing pipe penetrates through the side walls of the outer box body and the inner box body, and the cable passing pipe is used for passing through cables; it does not provide air inlets and air outlets on the box body, avoiding the contact between dust and the electrical equipment inside the box body to generate deflagration and improving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution boxes, and particularly to an explosion-proof distribution box for dust. Background Art

[0002] An explosion-proof distribution box for dust is an electrical equipment distribution box specially designed for environments containing combustible dust. A variety of explosion-proof distribution boxes for dust are disclosed in the prior art. For example, an explosion-proof lighting distribution box proposed in a Chinese invention patent with the publication number CN118508270B includes a box body and a box door connected to the box body. The box body further includes: air inlets opened on both sides of the box body; an opening and closing device connected to the inner side wall of the box body for opening and closing the air inlets; and an explosion-proof device connected to one side inside the box body for forming a sealed space to enclose the electrical components inside the box body. The beneficial effects of the present invention are: it can achieve the integration of heat dissipation, fire extinguishing and explosion isolation of the distribution box, and can effectively extinguish and block the fire generated inside the distribution box.

[0003] However, the above-mentioned existing explosion-proof lighting distribution box has air inlets provided on the box body. When dissipating heat, the outside air enters the inside of the box body to absorb the heat of the internal electrical equipment and then is discharged outside the box. Inevitably, the dust in the environment enters the box. These dusts are likely to cause deflagration when contacting the electrical equipment inside the box body, resulting in a decrease in safety. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an explosion-proof distribution box for dust that does not have air inlets and outlets on the box body, avoids deflagration caused by the contact between dust and the electrical equipment inside the box body, and improves safety.

[0005] An explosion-proof distribution box for dust of the present invention includes an outer box body and a box door. A chamber one is arranged inside the outer box body, and an opening one is arranged on the front end face of the outer box body. The box door is hinged to the front end of the outer box body to close the opening one. It also includes an inner box body, a fan, an air return port, a cable passing pipe, and a heat dissipation structure. The outer box body is made of a high thermal conductivity material, and the inner box body is made of a heat insulation material. The inner box body is installed in the chamber one of the outer box body. A chamber two is arranged inside the inner box body, and an opening two is arranged on the front end face of the inner box body. A gap is arranged between the outer wall of the inner box body and the inner wall of the outer box body. The heat dissipation structure is installed in the gap between the outer box body and the inner box body. An air inlet duct is arranged on the upper wall of the inner box body, and the duct is communicated with the upper gap between the inner box body and the outer box body. The fan is installed in the duct of the inner box body. A plurality of air return ports are arranged on the lower wall of the inner box body. Both the duct and the air return ports are communicated with the chamber two of the inner box body. The air return ports are communicated with the lower gap between the inner box body and the outer box body. The cable passing pipe penetrates through the side walls of the outer box body and the inner box body, and the cable passing pipe is used for threading cables. Electrical equipment is installed in the chamber two of the inner box body. The cable extends into the chamber two of the inner box body through the cable passing pipe and is electrically connected to the electrical equipment. The box door closes the opening one of the outer box body, isolating the external dust from the electrical equipment, achieving an explosion-proof effect. The electrical equipment dissipates heat into the air inside the chamber two of the inner box body. When the fan operates, the air in the chamber two of the inner box body is accelerated and input into the upper gap between the inner box body and the outer box body, and the air flows along the gap between the inner box body and the outer box body from the upper part to both sides and finally flows to the lower part and then returns to the chamber two of the inner box body through a plurality of air return ports, realizing the internal circulation of air. When the air flows between the gaps between the inner box body and the outer box body, the heat of the air is dissipated to the outside through the outer box body. By setting the heat dissipation structure between the outer box body and the inner box body, the heat dissipation efficiency is improved. Compared with the prior art where no air inlet and air outlet are arranged on the box body, the dust in the environment will not enter the box, avoiding the explosion and combustion caused by the contact between the dust and the electrical equipment inside the box body, and improving the safety.

[0006] Preferably, it further includes a cleaning box, a spray pipe, and a drain pipe. The cleaning box is installed on the outer box body. The input end of the spray pipe is connected to the cleaning box, and the output end of the spray pipe extends into the upper gap between the inner box body and the outer box body. A plurality of nozzles are installed on the output end of the spray pipe. The drain pipe penetrates through the bottom of the outer box body, and the input end of the drain pipe is communicated with the lower gap between the inner box body and the outer box body. A valve is arranged on the drain pipe. Cleaning agent is filled in the cleaning box. After working for a period of time, the cleaning agent in the cleaning box is sprayed into the upper gap between the inner box body and the outer box body through the spray pipe, so that the cleaning agent flows along the upper gap, both side gaps between the inner box body and the outer box body to the lower gap and is discharged through the drain pipe, cleaning the dust and the like attached in the gap between the inner box body and the outer box body, avoiding the danger caused by these dusts, and the cleaning agent can also perform emergency cooling on the outer box body and the inner box body. Even closing the drain pipe to make the cleaning agent enter the chamber two of the inner box body through a plurality of air return ports can perform emergency fire extinguishing on the electrical equipment.

[0007] Preferably, the heat dissipation structure includes a partition board. Interlayer cavities are provided inside the side wall, bottom wall, top wall and rear wall of the outer box body. The partition board is vertically installed in the middle of the interlayer cavity. An upper gap is provided between the upper end of the partition board and the top wall of the interlayer cavity, and a lower gap is provided between the lower end of the partition board and the bottom wall of the interlayer cavity. The interlayer cavity is filled with a refrigerant, and the partition board divides the refrigerant into two parts, the inner part and the outer part; the heat in the gap between the inner box body and the outer box body is transferred to the refrigerant in the inner part of the partition board through the inner wall of the interlayer cavity of the outer box body, so that the refrigerant in the inner part of the partition board is heated and flows upward over the upper end of the partition board and then enters the interlayer cavity outside the partition board. The refrigerant in the outer part of the partition board dissipates heat to the outside through the outer wall of the interlayer cavity of the outer box body, and the cooled refrigerant flows downward over the lower end of the partition board and enters the interlayer space inside the partition board, realizing the circulating flow of the refrigerant and improving the heat dissipation efficiency.

[0008] Preferably, it further includes a plurality of inner fins and a plurality of outer fins. The inner ends of the plurality of inner fins are installed on the inner wall of the partition board, the outer ends of the plurality of inner fins pass through the inner side wall of the outer box body and are connected to the inner wall of the inner box body. The part of the plurality of inner fins located between the outer box body and the inner box body forms a first channel. The inner ends of the plurality of outer fins are installed on the outer wall of the partition board, and the outer ends of the plurality of outer fins pass through the outer side wall of the outer box body and extend outside the outer box body; by providing a plurality of inner fins, the heat dissipation efficiency of the hot air between the inner box body and the outer box body to the refrigerant in the inner part of the partition board is improved, and by providing a plurality of outer fins, the heat dissipation efficiency of the refrigerant in the outer part of the partition board is improved, thereby further improving the heat dissipation efficiency of the electrical equipment in the chamber two of the inner box body.

[0009] Preferably, the plurality of inner fins are horizontally arranged, and the two ends of the plurality of inner fins are arranged up and down in a staggered manner, so that a zigzag channel is formed between the plurality of inner fins; by forming a zigzag channel with the plurality of inner fins, the flow time of the hot air between the inner box body and the outer box body is prolonged, and the heat dissipation efficiency of the plurality of inner fins is improved.

[0010] Preferably, it further includes a liquid replenishing pipe. The liquid replenishing pipe is installed on the outer box body, the liquid replenishing pipe is communicated with the interlayer cavity of the outer box body, and a valve is provided on the liquid replenishing pipe; it is convenient to replenish the refrigerant into the interlayer cavity of the outer box body through the liquid replenishing pipe.

[0011] Preferably, it further includes a front baffle and a filter. The front baffle is installed in the second opening of the inner box body. Avoidance holes for avoiding the operating parts of the electrical equipment are provided on the front baffle, air inlet holes are provided on the front baffle, and filters are installed on the air inlet holes; when opening the box door to operate the operating parts of the electrical equipment, the front baffle isolates the electrical equipment from the outside world, reducing the risk of deflagration caused by the sparks generated during the operation of the electrical equipment igniting dust.

[0012] Preferably, it further includes a surrounding plate, a plurality of air injection holes, and a conversion plate. The surrounding plate is installed between the second opening of the inner box body and the first opening of the outer box body. A plurality of air injection holes are arranged around the surrounding plate. The conversion plate is slidably installed on the bottom wall of the inner box body, and air passing holes matching the plurality of air return openings are provided on the conversion plate. When the box door is closed, the air passing holes of the conversion plate are aligned with the plurality of air return openings, so that the air circulates internally to dissipate heat from the electrical equipment. When the box door is opened to operate the electrical equipment, the conversion plate slides to stagger the air passing holes from the plurality of air return openings, so that the conversion plate blocks the plurality of air return openings. The outside air enters the second chamber of the inner box body after being filtered by the filter. The fan operates at a high speed, so that the air generated by the operation of the fan is ejected through the plurality of air injection holes on the surrounding plate, forming an annular air curtain in front of the first opening of the outer box body, blowing away the outside dust, reducing the dust entering the second chamber of the inner box body, and improving the dust explosion-proof effect.

[0013] Preferably, it further includes a spring, a push plate, and a pressure rod. One end of the spring is connected to the conversion plate, and the other end of the spring is connected to the inner box body. A notch is provided at the bottom of the front baffle. One end of the push plate is elastically rotatably installed in the notch of the front baffle through an elastic member and a rotating shaft. The push plate closes the notch of the front baffle. The push plate is located outside the end of the conversion plate away from the spring. The pressure rod is installed on the inner wall of the box door, and the pressure rod is aligned with the push plate. The conversion plate is elastically slidably installed on the bottom wall of the inner box body through the spring. When the box door is closed, the box door drives the pressure rod to extend into the second chamber of the inner box body, and the pressure rod squeezes the push plate to push it inward around the rotating shaft, so that the push plate rotates to push the conversion plate to one side, making the plurality of air passing holes of the conversion plate aligned with the plurality of air return openings. When the box door is opened, the pressure rod is separated from the push plate, the push plate is separated from the conversion plate, and the elastic force of the spring pushes the conversion plate to the other side, making the plurality of air passing holes of the conversion plate staggered from the plurality of air return openings, so that the conversion plate blocks the plurality of air return openings. The push plate returns elastically to close the notch of the front baffle, so that the front baffle maintains the sealing of the second chamber of the inner box body.

[0014] Preferably, it further includes a contact switch and a molecular sieve unit. The contact switch is installed on the outer box body and is aligned with the inner wall of the box door. The molecular sieve unit is installed on the inner box body and is close to the duct of the inner box body. When the box door is opened, the outside air enters the second chamber of the inner box body through the front baffle and the filter. The box door is separated from the contact switch, so that the contact switch turns on the molecular sieve unit. The molecular sieve unit absorbs the oxygen in the flowing air and discharges the absorbed oxygen to the outside of the outer box body, so that a low-oxygen area is formed in the gap between the inner box body and the outer box body and in the second chamber of the inner box body, improving the explosion-proof effect.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: no air inlet and air outlet are provided on the box body, so that the dust in the environment will not enter the box, avoiding the explosion and combustion caused by the contact between the dust and the electrical equipment inside the box body, and improving the safety. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic front-sectional structural diagram of the present invention;

[0018] Figure 3 is a schematic rear-sectional structural diagram of the present invention;

[0019] Figure 4 is a schematic structural diagram of the present invention in the state where the box door is opened;

[0020] Figure 5 is a schematic structural diagram of the present invention in the state where the front baffle is removed;

[0021] Figure 6 is a schematic structural diagram of the present invention in the disassembled state;

[0022] Figure 7 is a schematic structural diagram of the disassembled state of structures such as the outer box body and the partition board;

[0023] Figure 8 is a schematic structural diagram of structures such as the front baffle, filter, conversion board, spring, push plate, and pressure rod.

[0024] Reference numerals in the drawings: 1. Outer box body; 2. Box door; 3. Inner box body; 4. Fan; 5. Air return opening; 6. Cable passing pipe; 7. Cleaning box; 8. Spray pipe; 9. Drain pipe; 10. Partition board; 11. Inner fins; 12. Outer fins; 13. Liquid replenishing pipe; 14. Front baffle; 15. Filter; 16. Enclosure; 17. Spray holes; 18. Conversion board; 19. Spring; 20. Push plate; 21. Pressure rod; 22. Contact switch; 23. Molecular sieve unit. Detailed implementation manners

[0025] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0026] Example 1, as Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6As shown in the figure, an explosion-proof distribution box for dust includes an outer box body 1 and a box door 2. A first chamber is arranged inside the outer box body 1. An opening one is arranged on the front end face of the outer box body 1. The box door 2 is hinged to the front end of the outer box body 1 to close the opening one. It also includes an inner box body 3, a fan 4, a return air port 5, a cable passing pipe 6 and a heat dissipation structure. The outer box body 1 is made of a high thermal conductivity material, and the inner box body 3 is made of a heat insulation material. The inner box body 3 is installed in the first chamber of the outer box body 1. A second chamber is arranged inside the inner box body 3. An opening two is arranged on the front end face of the inner box body 3. A gap is arranged between the outer wall of the inner box body 3 and the inner wall of the outer box body 1. The heat dissipation structure is installed in the gap between the outer box body 1 and the inner box body 3. An air inlet duct is arranged on the upper wall of the inner box body 3. The duct is communicated with the upper gap between the inner box body 3 and the outer box body 1. The fan 4 is installed in the duct of the inner box body 3. A plurality of return air ports 5 are arranged on the lower wall of the inner box body 3. Both the duct and the return air ports 5 are communicated with the second chamber of the inner box body 3. The return air ports 5 are communicated with the lower gap between the inner box body 3 and the outer box body 1. The cable passing pipe 6 penetrates the side walls of the outer box body 1 and the inner box body 3. The cable passing pipe 6 is used for passing cables. It also includes a cleaning box 7, a spray pipe 8 and a drain pipe 9. The cleaning box 7 is installed on the outer box body 1. The input end of the spray pipe 8 is connected to the cleaning box 7. The output end of the spray pipe 8 extends into the upper gap between the inner box body 3 and the outer box body 1. A plurality of nozzles are installed on the output end of the spray pipe 8. The drain pipe 9 penetrates the bottom of the outer box body 1. The input end of the drain pipe 9 is communicated with the lower gap between the inner box body 3 and the outer box body 1. A valve is arranged on the drain pipe 9.

[0027] Electrical equipment is installed in the second chamber of the inner box body 3. The cable extends into the second chamber of the inner box body 3 through the cable passing pipe 6 and is electrically connected to the electrical equipment. The box door 2 closes the opening one of the outer box body 1, isolating the external dust from the electrical equipment and achieving an explosion-proof effect. The electrical equipment dissipates heat into the air inside the second chamber of the inner box body 3. When the fan 4 operates, the air in the second chamber of the inner box body 3 is accelerated and input into the upper gap between the inner box body 3 and the outer box body 1, and the air flows along the gap between the inner box body 3 and the outer box body 1 from the upper part to both sides and finally flows to the lower part and then returns to the second chamber of the inner box body 3 through a plurality of return air ports 5, realizing the internal circulation of air. When the air flows in the gap between the inner box body 3 and the outer box body 1, the heat of the air is dissipated to the outside through the outer box body 1. The heat dissipation efficiency is improved by the heat dissipation structure arranged between the outer box body 1 and the inner box body 3. Compared with the prior art where no air inlet and outlet are arranged on the box body, the dust in the environment will not enter the box, avoiding the explosion and combustion caused by the contact between the dust and the electrical equipment inside the box body and improving the safety.

[0028] Cleaning agent is filled in the cleaning box 7. After working for a period of time, the cleaning agent in the cleaning box 7 is sprayed into the upper gap between the inner box body 3 and the outer box body 1 through the nozzle 8, so that the cleaning agent flows along the upper gap and the gaps on both sides of the inner box body 3 and the outer box body 1 to the lower gap and is discharged through the drain pipe 9, so as to clean the dust attached to the gap between the inner box body 3 and the outer box body 1 to avoid the danger caused by these dusts. In addition, the cleaning agent can also perform emergency cooling of the outer box body 1 and the inner box body 3, and even close the drain pipe 9 to allow the cleaning agent to enter the chamber 2 of the inner box body 3 through multiple return air ports 5 to perform emergency fire extinguishing on electrical equipment.

[0029] Embodiment 2, as Figures 1 to 7 As shown, on the basis of Example 1, the heat dissipation structure includes a partition 10, and the inner parts of the side walls, bottom wall, top wall and rear wall of the outer box body 1 are all provided with interlayer cavities, the partition 10 is vertically installed in the middle of the interlayer cavity, an upper gap is set between the upper end of the partition 10 and the top wall of the interlayer cavity, and a lower gap is set between the lower end of the partition 10 and the bottom wall of the interlayer cavity, the interlayer cavity is filled with refrigerant, and the partition 10 separates the refrigerant into two parts, an inner part and an outer part; it also includes a plurality of inner fins 11 and a plurality of outer fins 12, and the inner ends of the plurality of inner fins 11 are installed in the partition On the inner wall of the plate 10, the outer ends of multiple inner fins 11 pass through the inner wall of the outer box body 1 and are connected to the inner wall of the inner box body 3, the parts of the multiple inner fins 11 located between the outer box body 1 and the inner box body 3 constitute channel 1, the inner ends of multiple outer fins 12 are installed on the outer wall of the partition 10, and the outer ends of multiple outer fins 12 pass through the outer wall of the outer box body 1 and extend out of the outside of the outer box body 1; it also includes a liquid infusion tube 13, the liquid infusion tube 13 is installed on the outer box body 1, the liquid infusion tube 13 is connected to the interlayer cavity of the outer box body 1, and a valve is arranged on the liquid infusion tube 13.

[0030] The refrigerant is conveniently replenished in the interlayer cavity of the outer box body 1 through the liquid replenishing tube 13; the heat in the gap between the inner box body 3 and the outer box body 1 is transferred to the refrigerant in the inner part of the partition 10 through the inner wall of the interlayer cavity of the outer box body 1, so that the refrigerant in the inner part of the partition 10 is heated and flows upward over the upper end of the partition 10 and then enters the interlayer cavity outside the partition 10. The refrigerant in the outer part of the partition 10 dissipates heat to the outside through the outer wall of the interlayer cavity of the outer box body 1, and the cooled refrigerant flows downward over the lower end of the partition 10 and enters the interlayer space inside the partition 10, thereby realizing the circulation of the refrigerant and improving the heat dissipation efficiency.

[0031] The multiple inner fins 11 are arranged horizontally, and the two ends of the multiple inner fins 11 are arranged in an up-and-down staggered manner, so that a tortuous channel is formed between the multiple inner fins 11;

[0032] By providing a plurality of inner fins 11, the heat dissipation efficiency of the refrigerant from the hot air between the inner box body 3 and the outer box body 1 to the inner side portion of the partition 10 is improved. By providing a plurality of outer fins 12, the heat dissipation efficiency of the refrigerant at the outer side portion of the partition 10 is improved, thereby further improving the heat dissipation efficiency of the electrical equipment in the second chamber of the inner box body 3. By forming the plurality of inner fins 11 into a zigzag channel, the flow time of the hot air between the inner box body 3 and the outer box body 1 is extended, and the heat dissipation efficiency of the plurality of inner fins 11 is improved.

[0033] Example 3, as Figure 4 、 Figure 5 、 Figure 6 and Figure 8 shown, on the basis of Example 1, it further includes a front baffle 14 and a filter 15. The front baffle 14 is installed in the second opening of the inner box body 3. Avoidance holes for avoiding the operating parts of the electrical equipment are provided on the front baffle 14. Air inlet holes are provided on the front baffle 14, and the filter 15 is installed on the air inlet holes; it further includes a surrounding plate 16, a plurality of air jet holes 17 and a conversion plate 18. The surrounding plate 16 is installed between the second opening of the inner box body 3 and the first opening of the outer box body 1. A plurality of air jet holes 17 are arranged in a ring on the surrounding plate 16. The conversion plate 18 is slidably installed on the bottom wall of the inner box body 3, and air passing holes matching the plurality of air return openings 5 are provided on the conversion plate 18; it further includes a spring 19, a push plate 20 and a pressure rod 21. One end of the spring 19 is connected to the conversion plate 18, and the other end of the spring 19 is connected to the inner box body 3. A notch is provided at the bottom of the front baffle 14. One end of the push plate 20 is elastically rotatably installed in the notch of the front baffle 14 through an elastic member and a rotating shaft. The push plate 20 closes the notch of the front baffle 14. The push plate 20 is located outside the end of the conversion plate 18 away from the spring 19. The pressure rod 21 is installed on the inner wall of the box door 2, and the pressure rod 21 is aligned with the push plate 20; it further includes a contact switch 22 and a molecular sieve unit 23. The contact switch 22 is installed on the outer box body 1, and the contact switch 22 is aligned with the inner wall of the box door 2. The molecular sieve unit 23 is installed on the inner box body 3, and the molecular sieve unit 23 is close to the duct of the inner box body 3.

[0034] The conversion plate 18 is elastically slidably installed on the bottom wall of the inner box body 3 through the spring 19. When the box door 2 is closed, the box door 2 drives the pressure rod 21 to extend into the second chamber of the inner box body 3, and the pressure rod 21 squeezes the push plate 20 to push inward around the rotating shaft, so that the push plate 20 rotates to push the conversion plate 18 to one side, so that the plurality of air passing holes of the conversion plate 18 are aligned with the plurality of air return openings 5, and the fan 4 operates to make the air circulate internally to dissipate heat from the electrical equipment;

[0035] When operating the operating parts of the electrical equipment with the box door 2 opened, the front baffle 14 isolates the electrical equipment from the outside world, reducing the risk of deflagration caused by sparks generated during the operation of the electrical equipment igniting dust.

[0036] The pressure bar 21 disengages from the push plate 20, and the push plate 20 disengages from the conversion plate 18. The elastic force of the spring 19 pushes the conversion plate 18 to the other side, causing multiple air passing holes of the conversion plate 18 to intersect with multiple air return openings 5, so that the conversion plate 18 blocks the multiple air return openings 5. The push plate 20 resets elastically to close the notch of the front baffle 14, so that the front baffle 14 maintains the sealing of the second chamber of the inner box body 3. The outside air enters the second chamber of the inner box body 3 through the front baffle 14 and the filter 15. The box door 2 disengages from the contact switch 22, so that the contact switch 22 turns on the molecular sieve unit 23. The molecular sieve unit 23 absorbs the oxygen in the flowing air and discharges the absorbed oxygen to the outside of the outer box body 1, so that a low-oxygen area is formed in the gap between the inner box body 3 and the outer box body 1 and in the second chamber of the inner box body 3, improving the explosion-proof effect;

[0037] The outside air enters the second chamber of the inner box body 3 after being filtered by the filter 15. The fan 4 runs at a high speed, so that the air generated by the operation of the fan 4 is ejected through multiple air jet holes 17 on the surrounding plate 16, forming an annular air curtain in front of the first opening of the outer box body 1 to blow away the outside dust and reduce the dust entering the second chamber of the inner box body 3, improving the dust explosion-proof effect.

[0038] Such as Figures 1 to 8As shown in the figure, an explosion-proof distribution box for dust of the present invention, when it is working, first, electrical equipment is installed in the second chamber of the inner box body 3, and cables extend into the second chamber of the inner box body 3 through the cable conduit 6 and are electrically connected to the electrical equipment. The box door 2 closes the first opening of the outer box body 1, isolating the external dust from the electrical equipment, achieving an explosion-proof effect. Then, the electrical equipment dissipates heat into the air in the second chamber of the inner box body 3. The fan 4 operates, accelerating the air in the second chamber of the inner box body 3 and inputting it into the gap between the upper parts of the inner box body 3 and the outer box body 1, and making the air flow from the upper part to both sides along the gap between the inner box body 3 and the outer box body 1 and finally flow to the lower part and then return to the second chamber of the inner box body 3 through a plurality of air return openings 5, realizing the internal circulation of air. Then, when the air flows between the gaps between the inner box body 3 and the outer box body 1, the heat of the hot air is transferred to the refrigerant in the inner part of the partition 10 through the inner wall of the sandwich cavity of the outer box body 1, making the refrigerant in the inner part of the partition 10 flow upward over the upper end of the partition 10 and enter the sandwich cavity outside the partition 10. The refrigerant in the outer part of the partition 10 dissipates heat to the outside through the outer wall of the sandwich cavity of the outer box body 1, and the cooled refrigerant flows downward over the lower end of the partition 10 and enters the sandwich space inside the partition 10, dissipating heat during the circulating flow of the refrigerant. Finally, when the box door 2 is opened, the pressure rod 21 disengages from the push plate 20, and the push plate 20 disengages from the conversion plate 18. The elastic force of the spring 19 pushes the conversion plate 18 to the other side, making the plurality of air passing holes of the conversion plate 18 staggered with the plurality of air return openings 5, so that the conversion plate 18 blocks the plurality of air return openings 5. The fan 4 operates at a high speed, making the air generated by the operation of the fan 4 spray out through the plurality of air spray holes 17 on the enclosure 16, forming an annular air curtain in front of the first opening of the outer box body 1, blowing away the external dust, reducing the dust entering the second chamber of the inner box body 3, and improving the dust explosion-proof effect.

[0039] The main functions achieved by the present invention are as follows:

[0040] 1. No air inlets and outlets are provided on the box body to avoid deflagration caused by the contact between dust and the electrical equipment inside the box body, improving safety;

[0041] 2. It can clean the dust and the like attached in the gap between the inner box body 3 and the outer box body 1, improving the explosion-proof effect;

[0042] 3. Heat dissipation is carried out through the circulating flow of the refrigerant, improving the heat dissipation efficiency;

[0043] 4. By spraying an annular air curtain in front of the door, the external dust is blown away, improving the dust explosion-proof effect;

[0044] 5. The molecular sieve unit 23 absorbs the oxygen in the flowing air and discharges the absorbed oxygen to the outside of the outer box body 1, making a low-oxygen area formed in the gap between the inner box body 3 and the outer box body 1 and in the second chamber of the inner box body 3, improving the explosion-proof effect.

[0045] An explosion-proof distribution box for dust of the present invention has an installation method, a connection method or a setting method that are all common mechanical methods, and any implementation that can achieve its beneficial effects can be carried out; the outer box body 1, the box door 2, the inner box body 3, the fan 4, the wire passing pipe 6, the cleaning box 7, the spray pipe 8, the drain pipe 9, the inner fins 11, the outer fins 12, the partition 10, the liquid replenishing pipe 13, the filter 15, the spring 19, the contact switch 22, and the molecular sieve unit 23 of an explosion-proof distribution box for dust of the present invention are purchased on the market, and technicians in this industry only need to install and operate according to the attached operation manual, without the need for technicians in this field to make creative efforts.

[0046] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A dust explosion-proof distribution box, comprising an outer box body (1) and a box door (2), wherein a chamber is arranged inside the outer box body (1), an opening is arranged on the front end surface of the outer box body (1), and the box door (2) is hinged at the front end of the outer box body (1) to close the opening; characterized in that: The invention also comprises an inner box (3), a fan (4), an air return port (5), a wire pipe (6) and a heat dissipation structure. The outer box (1) is made of a high thermal conductivity material, the inner box (3) is made of a heat insulating material, the inner box (3) is installed in a chamber 1 of the outer box (1), a chamber 2 is arranged inside the inner box (3), an opening 2 is arranged on the front end surface of the inner box (3), a gap is arranged between the outer wall of the inner box (3) and the inner wall of the outer box (1), the heat dissipation structure is installed in the gap between the outer box (1) and the inner box (3), and the inner box (1) is provided with a heat dissipation structure. An air intake duct is arranged on the upper wall of the inner box (3), the duct is communicated with the upper gap between the inner box (3) and the outer box (1), the fan (4) is installed in the duct of the inner box (3), a plurality of return air ports (5) are arranged on the lower wall of the inner box (3), the duct and the return air ports (5) are communicated with the second chamber of the inner box (3), the return air ports (5) are communicated with the lower gap between the inner box (3) and the outer box (1), a wire tube (6) passes through the side walls of the outer box (1) and the inner box (3), and the wire tube (6) is used for passing cables; It also includes a front baffle (14) and a filter (15), the front baffle (14) being mounted in the second opening of the inner box body (3), the front baffle (14) being provided with a clearance hole for avoiding operating components of the electrical equipment, the front baffle (14) being provided with an air intake hole, and the filter (15) being mounted on the air intake hole; It also includes a panel (16), a plurality of air jet holes (17) and a conversion plate (18), wherein the panel (16) is installed between the second opening of the inner box body (3) and the first opening of the outer box body (1), the plurality of air jet holes (17) are arranged around the panel (16), the conversion plate (18) is slidably installed on the bottom wall of the inner box body (3), and the conversion plate (18) is provided with air holes matching the plurality of return air ports (5); The invention also comprises a spring (19), a push plate (20) and a pressure rod (21), one end of the spring (19) is connected to the conversion plate (18), the other end of the spring (19) is connected to the inner box body (3), a notch is arranged at the bottom of the front baffle (14), one end of the push plate (20) is elastically rotatably mounted in the notch of the front baffle (14) through an elastic component and a rotating shaft, the push plate (20) closes the notch of the front baffle (14), the push plate (20) is located outside the end of the conversion plate (18) away from the spring (19), the pressure rod (21) is mounted on the inner wall of the box door (2), and the pressure rod (21) is aligned with the push plate (20).

2. A dust-proof explosion-proof distribution box as claimed in claim 1, characterized in that: The invention also comprises a cleaning box (7), a spray pipe (8) and a drainage pipe (9), wherein the cleaning box (7) is mounted on the outer box body (1), the input end of the spray pipe (8) is connected to the cleaning box (7), the output end of the spray pipe (8) extends into the upper gap between the inner box body (3) and the outer box body (1), a plurality of nozzles are mounted on the output end of the spray pipe (8), the drainage pipe (9) is passed through the bottom of the outer box body (1), the input end of the drainage pipe (9) is connected to the lower gap between the inner box body (3) and the outer box body (1), and a valve is arranged on the drainage pipe (9).

3. A dust-proof explosion-proof distribution box as claimed in claim 1, characterized in that: The heat dissipation structure comprises a partition (10), and a sandwich cavity is arranged inside the side wall, bottom wall, top wall and rear wall of the outer box body (1). The partition (10) is vertically installed in the middle of the sandwich cavity. An upper gap is arranged between the upper end of the partition (10) and the top wall of the sandwich cavity, and a lower gap is arranged between the lower end of the partition (10) and the bottom wall of the sandwich cavity. The sandwich cavity is filled with a refrigerant, and the partition (10) separates the refrigerant into an inner and an outer part.

4. A dust-proof explosion-proof distribution box as claimed in claim 3, characterized in that: The invention also comprises a plurality of inner fins (11) and a plurality of outer fins (12), wherein the inner ends of the plurality of inner fins (11) are mounted on the inner wall of the partition (10), the outer ends of the plurality of inner fins (11) pass through the inner side wall of the outer box body (1) and are connected to the inner wall of the inner box body (3), the portion of the plurality of inner fins (11) located between the outer box body (1) and the inner box body (3) constitutes a channel 1, the inner ends of the plurality of outer fins (12) are mounted on the outer wall of the partition (10), and the outer ends of the plurality of outer fins (12) pass through the outer side wall of the outer box body (1) and extend out of the outer box body (1).

5. A dust-proof explosion-proof distribution box as claimed in claim 4, characterized in that: The plurality of inner fins (11) are arranged horizontally, and the two ends of the plurality of inner fins (11) are arranged in an up-and-down staggered manner, so that a zigzag channel is formed between the plurality of inner fins (11).

6. A dust-proof explosion-proof distribution box as claimed in claim 3, characterized in that: It also comprises a liquid infusion tube (13), the liquid infusion tube (13) being mounted on the outer box body (1), the liquid infusion tube (13) being in communication with the interlayer cavity of the outer box body (1), and a valve being arranged on the liquid infusion tube (13).

7. The dust-proof explosion-proof distribution box according to claim 1, characterized in that: It also includes a contact switch (22) and a molecular sieve unit (23), wherein the contact switch (22) is mounted on the outer box body (1), the contact switch (22) is aligned with the inner wall of the box door (2), and the molecular sieve unit (23) is mounted on the inner box body (3), the molecular sieve unit (23) is close to the duct of the inner box body (3).

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