Explosion-proof distribution box for dust

Abstract

The invention relates to the technical field of distribution boxes, in particular to an explosion-proof distribution box for dust, which comprises an outer box body and a box door, the air conditioner further comprises an inner box body, a fan, an air return port, a wire passing pipe and a heat dissipation structure, the inner box body is installed in the outer box body, a gap is formed 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 formed in 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 a duct of the inner box body, the lower wall of the inner box body is provided with a plurality of return air inlets, the duct and the return air inlets are communicated with a second cavity of the inner box body, the return air inlets are communicated with a lower gap between the inner box body and the outer box body, and the wire passing pipe penetrates through the outer box body and the side wall of the inner box body and is used for allowing a cable to penetrate through; an air inlet and an air outlet are not formed in the box body, so that detonation caused by contact between dust and electrical equipment in the box body is avoided, and the safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of distribution boxes, in particular to a dust-proof explosion-proof distribution box. Background Art

[0002] A dust explosion-proof distribution box is a distribution box for electrical equipment specially designed for use in an environment containing combustible dust. A variety of dust explosion-proof distribution boxes are disclosed in the prior art, such as an explosion-proof lighting distribution box proposed in the Chinese invention patent with publication number CN118508270B, which includes a box body and a box door connected to the box body, and the box body also includes: an air inlet opened on both sides of the box body; an opening and closing device connected to the inner wall of the box body for opening and closing the air inlet; an explosion-proof device connected to one side of the box body for forming a sealed space to enclose the electrical components in the box body. The beneficial effects of the present invention are: it can realize the integration of heat dissipation, fire extinguishing and explosion-proofing 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 is provided with an air inlet on the box body, which allows outside air to enter the box body to absorb the heat of the internal electrical equipment and then be discharged outside the box during heat dissipation. This inevitably causes dust in the environment to enter the box. The dust can easily cause deflagration when in contact with the electrical equipment inside the box, resulting in reduced safety. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a dust-proof explosion-proof distribution box which does not have air inlets and outlets on the box body, thereby avoiding explosion caused by dust contacting electrical equipment inside the box body and improving safety.

[0005] The invention discloses an explosion-proof distribution box for dust, comprising an outer box body and a box door, wherein a chamber 1 is arranged inside the outer box body, an opening 1 is arranged on the front end surface of the outer box body, and the box door is hinged at the front end of the outer box body to close the opening 1; the box also comprises an inner box body, a fan, a return air port, a wire passing pipe and a heat dissipation structure, the outer box body is made of a high thermal conductivity material, the inner box body is made of a heat insulating material, the inner box body is installed in the chamber 1 of the outer box body, a chamber 2 is arranged inside the inner box body, an opening 2 is arranged on the front end surface of the inner box body, and the outer wall of the inner box body is connected to the outer box body. A gap is set between the inner walls of the outer box body, a heat dissipation structure is installed in the gap between the outer box body and the inner box body, an air inlet duct is set on the upper wall of the inner box body, the duct is connected to 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 return air ports are set on the lower wall of the inner box body, the duct and the return air ports are both connected to the second chamber of the inner box body, the return air ports are connected to the lower gap between the inner box body and the outer box body, a wire pipe runs through the side walls of the outer box body and the inner box body, and the wire pipe is used to pass the cable; electrical equipment is installed The cable is installed in the chamber two of the inner box body, and the cable is extended into the chamber two of the inner box body through the wire tube and is electrically connected to the electrical equipment. The box door closes the opening one of the outer box body, isolates the external dust from the electrical equipment, and achieves an explosion-proof effect. The electrical equipment dissipates heat into the air in the chamber two of the inner box body. When the fan runs, the air in the chamber two of the inner box body is accelerated and input into the gap between the inner box body and the upper part of the outer box body, and the air is made to flow from the top to the two sides along the gap between the inner box body and the outer box body, and finally flows to the bottom and then flows back to the chamber two of the inner box body through multiple return air ports, so as to realize the internal circulation of the air. When the air flows between the gap 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. The heat dissipation efficiency is improved by the heat dissipation structure arranged between the outer box body and the inner box body. Compared with the prior art, no air inlet and air outlet are arranged on the box body, so the dust in the environment will not enter the box, so as to avoid the dust from contacting the electrical equipment inside the box body to produce explosion and improve the safety.

[0006] Preferably, it also 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, 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 is passed through the bottom of the outer box body, the input end of the drain pipe is communicated with the lower gap between the inner box body and the outer box body, and a valve is arranged on the drain pipe; the cleaning agent is filled in the cleaning box, and 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 and the gaps on both sides of the inner box body to the lower gap and is discharged through the drain pipe, so as to clean the dust and the like attached to the gap between the inner box body and the outer box body to avoid the danger caused by the dust, and the cleaning agent can also perform emergency cooling of the outer box body and the inner box body, and even close the drain pipe to allow the cleaning agent to enter the chamber 2 of the inner box body through multiple return air ports to perform emergency fire extinguishing on the electrical equipment.

[0007] Preferably, the heat dissipation structure includes a partition, and interlayer cavities are arranged inside the side walls, bottom wall, top wall and rear wall of the outer box body. The partition is vertically installed in the middle of the interlayer cavity, an upper gap is arranged between the upper end of the partition and the top wall of the interlayer cavity, and a lower gap is arranged between the lower end of the partition and the bottom wall of the interlayer cavity. The interlayer cavity is filled with refrigerant, and the partition separates the refrigerant into an inner part, an 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 through the inner wall of the interlayer cavity of the outer box body, so that the refrigerant in the inner part of the partition is heated and flows upward, passes over the upper end of the partition, and enters the interlayer cavity outside the partition, and the refrigerant in the outer part of the partition dissipates heat to the outside through the outer wall of the interlayer cavity of the outer box body, and the cooled refrigerant flows downward, passes over the lower end of the partition, and enters the interlayer space inside the partition, thereby realizing the circulation of the refrigerant and improving the heat dissipation efficiency.

[0008] Preferably, it also includes multiple inner fins and multiple outer fins, the inner ends of the multiple inner fins are installed on the inner wall of the partition, the outer ends of the multiple inner fins pass through the inner wall of the outer box body and are connected to the inner wall of the inner box body, the parts of the multiple inner fins located between the outer box body and the inner box body constitute channel one, the inner ends of the multiple outer fins are installed on the outer wall of the partition, and the outer ends of the multiple outer fins pass through the outer wall of the outer box body and extend to the outside of the outer box body; by arranging multiple inner fins, the heat dissipation efficiency of the hot air between the inner box body and the outer box body to the refrigerant on the inner part of the partition is improved, and by arranging multiple outer fins, the heat dissipation efficiency of the refrigerant on the outer part of the partition is improved, thereby further improving the heat dissipation efficiency of the electrical equipment in chamber two of the inner box body.

[0009] Preferably, the multiple inner fins are arranged horizontally, and the two ends of the multiple inner fins are arranged alternately up and down, so that a tortuous channel is formed between the multiple inner fins; by making the multiple inner fins form a tortuous channel, the flow time of hot air between the inner box and the outer box is extended, and the heat dissipation efficiency of the multiple inner fins is improved.

[0010] Preferably, it also includes a liquid infusion tube, which is installed on the outer box body, connected to the interlayer cavity of the outer box body, and a valve is arranged on the liquid infusion tube; the refrigerant is conveniently added to the interlayer cavity of the outer box body through the liquid infusion tube.

[0011] Preferably, it also includes a front baffle and a filter, the front baffle is installed in the second opening of the inner box body, the front baffle is provided with an avoidance hole for avoiding the operating parts of the electrical equipment, the front baffle is provided with an air inlet, and the filter is installed on the air inlet; when the box door is opened to operate the operating parts of the electrical equipment, the front baffle isolates the electrical equipment from the outside world, thereby reducing the risk of explosion caused by sparks generated when operating the electrical equipment igniting dust.

[0012] Preferably, it also includes a surrounding plate, multiple jet 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, and the multiple jet holes are arranged around the surrounding plate. The conversion plate is slidably installed on the bottom wall of the inner box body, and the conversion plate is provided with air holes matching the multiple return air outlets; when the box door is closed, the air holes of the conversion plate are aligned with the multiple return air outlets, so that the air circulates inside to dissipate heat for the electrical equipment. When the box door is opened to operate the electrical equipment, the conversion plate slides to make the air holes and the multiple return air outlets intersect, so that the conversion plate blocks the multiple return air outlets, and the outside air enters the chamber two of the inner box body after being filtered by the filter. The fan runs at high speed, so that the wind generated by the fan operation is ejected through the multiple jet holes on the surrounding plate, forming an annular air curtain in front of the opening one of the outer box body, blowing away the outside dust, reducing the dust entering the chamber two of the inner box body, and improving the dust explosion-proof effect.

[0013] Preferably, it also includes a spring, a push plate and a pressure rod, one end of the spring is connected to the conversion plate, the other end of the spring is connected to the inner box body, a notch is set 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 component 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, and when the box door is closed, the box door drives the pressure rod to extend into the inner The push plate is in chamber two of the box body, and the pressure rod squeezes the push plate and pushes it inward around the rotating shaft, so that the push plate rotates to push the conversion plate to one side, so that the multiple air holes of the conversion plate are aligned with the multiple return air outlets; when the box door is opened, the pressure rod is disengaged from the push plate, and the push plate is disengaged from the conversion plate, and the elastic force of the spring pushes the conversion plate to the other side, so that the multiple air holes of the conversion plate are staggered with the multiple return air outlets, so that the conversion plate blocks the multiple return air outlets, and the push plate elastic force is reset to close the notch of the front baffle, so that the front baffle maintains the sealing of chamber two of the inner box body.

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

[0015] Compared with the prior art, the present invention has the following beneficial effects: no air inlet and outlet are provided on the box body, dust in the environment will not enter the box, and dust is prevented from contacting the electrical equipment inside the box body to produce explosion, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a front cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the rear cross-sectional structure of the present invention; Figure 4 It is a structural schematic diagram of the box door of the present invention in an open state; Figure 5 is a schematic structural diagram of the present invention in a state where the front baffle is removed; Figure 6 It is a schematic structural diagram of the present invention in a decomposed state; Figure 7 It is a schematic diagram of the structure of the exploded state of the outer box body and the partition; Figure 8 It is a schematic diagram of the structure of the front baffle, filter, conversion plate, spring, push plate and pressure rod.

[0017] Markings in the attached drawings: 1. outer box body; 2. box door; 3. inner box body; 4. fan; 5. return air outlet; 6. wire pipe; 7. cleaning box; 8. nozzle; 9. drain pipe; 10. partition; 11. inner fin; 12. outer fin; 13. liquid replenishment tube; 14. front baffle; 15. filter; 16. enclosure; 17. jet hole; 18. conversion plate; 19. spring; 20. push plate; 21. pressure rod; 22. contact switch; 23. molecular sieve unit. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present invention, the present invention will be described more fully 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, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] Embodiment 1, as Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, a dust explosion-proof distribution box comprises an outer box body 1 and a box door 2, wherein a chamber 1 is arranged inside the outer box body 1, an opening 1 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 1; it also comprises an inner box body 3, a fan 4, a return air port 5, a wire passing pipe 6 and a heat dissipation structure, the outer box body 1 is made of a high thermal conductivity material, the inner box body 3 is made of a heat insulating material, the inner box body 3 is installed in the chamber 1 of the outer box body 1, a chamber 2 is arranged inside the inner box body 3, an opening 2 is arranged on the front end surface 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, a 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, and the upper gap between the duct and 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, and a plurality of return air ports 5 are arranged on the lower wall of the inner box body 3. The duct and the return air ports 5 are both connected with the second chamber of the inner box body 3, and the return air ports 5 are connected with the lower gap between the inner box body 3 and the outer box body 1. The wire passing pipe 6 passes through the side walls of the outer box body 1 and the inner box body 3, and the wire passing pipe 6 is used for passing the cable. It also includes a cleaning box 7, a nozzle 8 and a drain pipe 9. The cleaning box 7 is installed on the outer box body 1, and the input end of the nozzle 8 is connected with the cleaning box 7, and the output end of the nozzle 8 extends into the upper gap between the inner box body 3 and the outer box body 1. A plurality of nozzles are arranged on the output end of the nozzle 8, and the drain pipe 9 is passed through the bottom of the outer box body 1, and the input end of the drain pipe 9 is connected with the lower gap between the inner box body 3 and the outer box body 1, and a valve is arranged on the drain pipe 9.

[0020] The electrical equipment is installed in the chamber 2 of the inner box 3, and the cable is extended into the chamber 2 of the inner box 3 through the wire tube 6 to be electrically connected to the electrical equipment. The box door 2 closes the opening 1 of the outer box 1 to isolate the external dust from the electrical equipment, thereby achieving an explosion-proof effect. The electrical equipment dissipates heat into the air in the chamber 2 of the inner box 3. The fan 4 runs to accelerate the air in the chamber 2 of the inner box 3 into the gap between the inner box 3 and the upper part of the outer box 1, and makes the air flow from the upper part to the two sides along the gap between the inner box 3 and the outer box 1. The side flow finally flows to the lower part and then flows back to the chamber 2 of the inner box body 3 through multiple return air ports 5, realizing the internal circulation of air. When the air flows between 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, no air inlet and air outlet are arranged on the box body, and dust in the environment will not enter the box, so as to avoid dust from contacting with the electrical equipment inside the box body to produce explosion and improve safety. 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.

[0021] 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.

[0022] 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.

[0023] 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; The heat dissipation efficiency of the hot air between the inner box body 3 and the outer box body 1 to the refrigerant on the inner side of the partition 10 is improved by providing a plurality of inner fins 11, and the heat dissipation efficiency of the refrigerant on the outer side of the partition 10 is improved by providing a plurality of outer fins 12, thereby further improving the heat dissipation efficiency of the electrical equipment in the second chamber of the inner box body 3. By making the plurality of inner fins 11 form a tortuous passage, the flow time of the hot air between the inner box body 3 and the outer box body 1 is extended, thereby improving the heat dissipation efficiency of the plurality of inner fins 11.

[0024] Embodiment 3, as Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, on the basis of embodiment 1, it also 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, the front baffle 14 is provided with a avoidance hole for avoiding the operating parts of the electrical equipment, the front baffle 14 is provided with an air inlet, and the filter 15 is installed on the air inlet; it also includes a panel 16, a plurality of jet holes 17 and a conversion plate 18, 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 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; it also includes a spring 19, a push plate 20 and a pressure rod 21, the spring 19 One end 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 set 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 component and a rotating shaft. The push plate 20 closes the notch of the front baffle 14. The push plate 20 is located on the outer side of 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 also 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.

[0025] The conversion plate 18 is elastically slidably mounted on the bottom wall of the inner box body 3 by means of a 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 and pushes it inward around the rotation axis, so that the push plate 20 rotates to push the conversion plate 18 to one side, so that the multiple air holes of the conversion plate 18 are aligned with the multiple return air ports 5, and the fan 4 is running so that the air circulates inside to dissipate heat for the electrical equipment; When the box door 2 is opened to operate the operating components of the electrical equipment, the front baffle 14 isolates the electrical equipment from the outside world, reducing the risk of sparks generated when operating the electrical equipment igniting dust and causing explosion; The pressure rod 21 is disengaged from the push plate 20, and the push plate 20 is disengaged from the conversion plate 18. The elastic force of the spring 19 pushes the conversion plate 18 to the other side, so that the multiple air holes of the conversion plate 18 are staggered with the multiple return air ports 5, so that the conversion plate 18 blocks the multiple return air ports 5. The push plate 20 is elastically reset to close the notch of the front baffle 14, so that the front baffle 14 maintains the sealing of the chamber 2 of the inner box body 3. The outside air enters the chamber 2 of the inner box body 3 through the front baffle 14 and the filter 15. The box door 2 is disengaged from the contact switch 22, so that the contact switch 22 opens the molecular sieve unit 23. The molecular sieve unit 23 absorbs oxygen in the flowing air and discharges the absorbed oxygen to the outside of the outer box body 1, so that a low oxygen zone is formed in the gap between the inner box body 3 and the outer box body 1 and in the chamber 2 of the inner box body 3, thereby improving the explosion-proof effect. The outside air is filtered by the filter 15 and then enters the chamber 2 of the inner box body 3. The fan 4 runs at a high speed, so that the wind generated by the fan 4 is ejected through the multiple jet holes 17 on the enclosure 16, forming an annular air curtain in front of the opening 1 of the outer box body 1, blowing away the outside dust, reducing the dust from entering the chamber 2 of the inner box body 3, and improving the dust explosion-proof effect.

[0026] like Figures 1 to 8As shown, a dust-proof explosion-proof distribution box of the present invention, when working, first the electrical equipment is installed in the chamber 2 of the inner box body 3, the cable is extended into the chamber 2 of the inner box body 3 through the wire tube 6 and electrically connected to the electrical equipment, the box door 2 closes the opening 1 of the outer box body 1, isolates the external dust from the electrical equipment, and achieves an explosion-proof effect, and then the electrical equipment dissipates heat to the air in the chamber 2 of the inner box body 3, the fan 4 runs, accelerates the air in the chamber 2 of the inner box body 3 to be input into the gap between the inner box body 3 and the upper part of the outer box body 1, and makes the air flow from the top to the sides along the gap between the inner box body 3 and the outer box body 1, and finally flows to the bottom and then flows back to the chamber 2 of the inner box body 3 through multiple return air ports 5, so as to realize the internal circulation of the air, and then when the air flows between the gap 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 interlayer cavity of the outer box body 1, so that the partition 1 The refrigerant in the inner part is heated and flows upward, passes over the upper end of the partition 10, and 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. The cooled refrigerant flows downward, passes over the lower end of the partition 10, and enters the interlayer space inside the partition 10. Heat is dissipated during the circulation of the refrigerant. Finally, when the box door 2 is opened, the pressure rod 21 is separated from the push plate 20, and the push plate 20 is separated from the conversion plate 1. 8 is disengaged, and the elastic force of the spring 19 pushes the conversion plate 18 to the other side, so that the multiple air holes of the conversion plate 18 are staggered with the multiple return air ports 5, so that the conversion plate 18 blocks the multiple return air ports 5, and the fan 4 runs at a high speed, so that the wind generated by the operation of the fan 4 is ejected through the multiple jet holes 17 on the enclosure 16, forming an annular air curtain in front of the opening of the outer box body 1, blowing away the external dust, reducing the dust from entering the chamber 2 of the inner box body 3, and improving the dust explosion-proof effect.

[0027] The main functions achieved by the present invention are: 1. No air inlet or outlet is set on the box to avoid dust from contacting the electrical equipment inside the box and causing explosion, thus improving safety; 2. It can clean the dust and the like attached to the gap between the inner box body 3 and the outer box body 1, thereby improving the explosion-proof effect; 3. Heat dissipation is carried out through the circulation of refrigerant to improve heat dissipation efficiency; 4. By spraying a circular air curtain in front of the door, the dust from the outside is blown away to improve the dust explosion-proof effect; 5. The molecular sieve unit 23 absorbs oxygen in the flowing air and discharges the absorbed oxygen to the outside of the outer box 1, so that a low oxygen zone is formed in the gap between the inner box 3 and the outer box 1 and in the second chamber of the inner box 3, thereby improving the explosion-proof effect.

[0028] The installation method, connection method or setting method of the explosion-proof distribution box for dust of the present invention are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented; the outer box body 1, box door 2, inner box body 3, fan 4, wire passing pipe 6, cleaning box 7, nozzle 8, drain pipe 9, inner fin 11, outer fin 12, partition 10, liquid replenishment pipe 13, filter 15, spring 19, contact switch 22, and molecular sieve unit 23 of the explosion-proof distribution box for dust of the present invention are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for creative labor by technicians in this field.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection 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 provided 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), a fan (4) is installed in the duct of the inner box (3), a plurality of return air ports (5) are provided on the lower wall of the inner box (3), the duct and the return air ports (5) are both 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.

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 front baffle (14) and a filter (15), wherein the front baffle (14) is mounted in the second opening of the inner box body (3), a clearance hole for avoiding operating components of the electrical equipment is provided on the front baffle (14), an air intake hole is provided on the front baffle (14), and the filter (15) is mounted on the air intake hole.

8. A dust-proof explosion-proof distribution box as claimed in claim 7, characterized in that: The invention also comprises a panel (16), a plurality of air jet holes (17) and a conversion plate (18); 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 air holes matching the plurality of return air ports (5) are arranged on the conversion plate (18).

9. A dust-proof explosion-proof distribution box as claimed in claim 8, characterized in that: 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).

10. A dust-proof explosion-proof distribution box as claimed in claim 9, 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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