An explosion-proof terminal box

Abstract

The present application relates to the technical field of terminal box, and discloses an explosion-proof terminal box, which comprises a box body, a first connecting sleeve and a second connecting sleeve arranged on the top surface and the bottom surface of the box body respectively, and a heat exchange pipe connected between the first connecting sleeve and the second connecting sleeve; a fan cylinder is installed on the first connecting sleeve, a connecting pipe is arranged in the fan cylinder, an exhaust piece is rotatably installed in the connecting pipe through a bearing, a plurality of first magnets are uniformly fixed to the inner wall of the fan cylinder, and a plurality of second magnets are uniformly fixed to the exhaust piece, the fan cylinder is blown to rotate around its axis by the natural wind in the environment, the first magnets fixed to the inner wall of the fan cylinder rotate synchronously, the second magnets enclosed in the connecting pipe are subjected to magnetic drag force due to the magnetic coupling effect, so that the exhaust piece is synchronously driven to rotate without contact, induced air flow is generated in the connecting pipe, and the hot gas in the box body is actively accelerated to be drawn into and flow through the whole heat exchange pipe circuit, so that the convective heat exchange intensity between the hot gas and the external cold air is enhanced.

Description

Technical Field

[0001] This invention relates to the field of junction box technology, specifically to an explosion-proof junction box. Background Technology

[0002] An explosion-proof junction box is an electrical device with explosion-proof capabilities, primarily used for the safe distribution and connection of power supplies and load equipment in flammable, explosive, or hazardous gas environments. It is designed to prevent explosions caused by sparks, electric arcs, and high temperatures, ensuring the safe operation of electrical equipment in hazardous environments.

[0003] Existing explosion-proof junction boxes mostly rely on external natural wind for cooling, which is ineffective and slow, failing to achieve rapid cooling. To address this heat dissipation problem, the industry has proposed several improvements. For example, patent application CN202410466745.0 discloses an intelligent temperature-controlled explosion-proof junction box, belonging to the field of explosion-proof junction box technology. It includes an explosion-proof junction box body, with an inlet port on one side and an outlet port on the other. An intelligent temperature control component is installed on the outer side of the body. This invention solves the problem that existing explosion-proof junction boxes mostly rely on external natural wind for cooling, which is ineffective and slow, failing to achieve rapid cooling. Delayed cooling may cause internal damage such as burning, reducing the lifespan of the explosion-proof junction box.

[0004] However, in order to efficiently dissipate heat from the enclosure, such solutions typically require ventilation holes or active cooling components to be installed on the explosion-proof enclosure. This inevitably compromises the original "flameproof" or "increased safety" sealing integrity of the enclosure. Once the explosion-proof structure is damaged, its inherent explosion-proof safety level will be lost, and operation in hazardous environments will pose an unacceptable risk of explosion. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an explosion-proof junction box.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An explosion-proof junction box includes a box body. A first connecting sleeve and a second connecting sleeve are respectively provided on the top and bottom surfaces of the box body. A heat exchange tube is connected between the first connecting sleeve and the second connecting sleeve. A fan cylinder is installed on the first connecting sleeve. A connecting pipe is provided inside the fan cylinder for connecting to the heat exchange tube. An exhaust component is rotatably installed inside the connecting pipe via a bearing. A plurality of first magnets are uniformly fixed to the inner wall of the fan cylinder. A plurality of second magnets are uniformly fixed to the exhaust component. The first magnets and second magnets are arranged opposite to each other to drive the exhaust component to rotate inside the connecting pipe through magnetic coupling.

[0007] In order to convert natural wind energy in any direction into rotational mechanical energy, providing free driving power for the entire heat dissipation device and realizing zero-energy active heat dissipation, preferably, the fan cylinder includes a base and a sleeve that can rotate relative to the base. The base is fixedly installed with a first connecting sleeve, the sleeve is installed on the base through a bearing, the first magnet is fixedly installed on the inner wall of the sleeve, and outer fan blades are equidistantly installed on the outer wall of the sleeve along the circumferential direction.

[0008] In order to firmly fix the slender connecting tube to the base and effectively prevent its vibration and sway under wind load and internal rotating parts, and to ensure the accuracy and stability of the internal magnetic coupling transmission, the connecting tube further includes a tube body. A sealing ring is fixedly installed at one end of the tube body located inside the first connecting sleeve, and at least one U-shaped rod is fixedly installed at the other end of the tube body protruding from the sleeve. The end of the U-shaped rod away from the tube body is fixed to the base.

[0009] In order to generate a strong axial induced airflow near the inlet of the heat exchange tube in the connecting pipe, preferably, the exhaust component includes a drive shaft rotatably installed inside the connecting pipe, with a boss and an axial fan fixedly installed at both ends of the drive shaft, and the second magnet fixedly installed on the boss.

[0010] In order to increase the heat dissipation surface area and enhance heat exchange with the air, the heat exchange tube is fixed to the housing and can also be assisted in heat conduction through the housing wall to form a better heat dissipation path. Preferably, fins are fixedly installed on the heat exchange tube and the fins are fixed to the outer wall of the housing.

[0011] In addition to the basic air-cooled circuit, a switchable enhanced heat dissipation circuit is connected in parallel. When the basic heat dissipation is insufficient, it can automatically switch to the enhanced circuit, providing dual heat dissipation protection for the explosion-proof junction box. Preferably, the heat exchange tube has a T-shaped pipe 1 and a T-shaped pipe 2 connected in series in the pipeline. A reversing element is installed in the internal flow channel of the T-shaped pipe 1, and a cooling device is connected to the remaining outlet of the T-shaped pipe 1. A loop pipe is fixedly connected between the cooling device and the remaining outlet of the T-shaped pipe 2.

[0012] To achieve automatic switching, the reversing component further includes a positioning seat fixedly installed inside a three-way pipe, a positioning rod fixedly installed on the positioning seat, a sealing tube slidably installed inside the positioning seat, a piston installed inside the sealing tube, an expansion medium filling the space between the sealing tube and the piston, and the positioning rod abutting against the piston; a first valve plate is fixedly installed at one end of the sealing tube, a first spring is sleeved on the first valve plate, and the two ends of the first spring are respectively fixed to the first valve plate and the stepped surface of the sealing tube itself.

[0013] Furthermore, a second valve plate is fixedly installed at the end of the sealing tube away from the first valve plate, and a second spring is sleeved on the sealing tube, with the two ends of the second spring fixed to the second valve plate and the positioning seat, respectively.

[0014] In order to generate a continuous airflow to remove heat, the cooling device further includes a cooling box and at least one heat dissipation pipe, the heat dissipation pipe extending horizontally through the cooling box, and the outer circumference of the heat dissipation pipe forming a seal with the cooling box; wherein, the inclination angle of the heat dissipation pipe is α, and satisfies 6°≤α≤25°.

[0015] To effectively prevent dust, insects, and other foreign objects from clogging the heat dissipation pipes and reduce maintenance requirements, dustproof nets are installed at both ends of the heat dissipation pipes.

[0016] The beneficial effects of this invention are: 1. Natural airflow from the environment acts on the fan barrel, causing it to rotate around its axis. The first magnet fixed to the inner wall of the fan barrel rotates synchronously. Due to magnetic coupling, the rotating magnetic field passes through the non-magnetic connecting pipe wall, generating a magnetic drag force on the second magnet enclosed inside the connecting pipe. This drives the exhaust component to rotate synchronously without contact. The rotating exhaust component generates induced airflow inside the connecting pipe, actively accelerating the extraction of hot gas from the enclosure and allowing it to flow through the entire heat exchange tube circuit. This enhances the convective heat transfer intensity between the hot gas and the external cold air. Power transmission is achieved through non-contact magnetic coupling. The heat exchange circuit is completely sealed, with no rotating shaft penetrating or dynamic sealing points on the explosion-proof enclosure body, maintaining the integrity of the original explosion-proof structure. All moving parts are located externally, simplifying maintenance. There are no components inside the critical explosion-proof area that could generate sparks or high temperatures, reducing the risk of compromising the explosion-proof integrity due to heat dissipation needs.

[0017] 2. Through the designed reversing component, a fully automatic, adaptive, and passive switching of the heat dissipation mode is achieved using a purely mechanical structure. When the working fluid temperature is low, the valve automatically connects the energy-saving natural air cooling circuit and cuts off the enhanced cooling circuit under the action of the spring, allowing the system to operate in a zero-power mode. When the working fluid temperature is detected to exceed the set threshold, the driving force generated by the expansion of the temperature-sensing medium inside the valve can automatically and reliably switch the flow channel, closing the natural air circuit and connecting the enhanced cooling circuit to cope with high-temperature and high-load conditions. This process requires no external control or energy input, and the structure is simple and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a second perspective view of the overall structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the fan cylinder and its components according to the present invention; Figure 4 This is a schematic diagram of the internal structure of the fan cylinder of the present invention; Figure 5 This is a schematic diagram of the three-way pipe and its internal reversing component of the present invention; Figure 6 This is a schematic diagram of the sealing tube and piston structure of the present invention; Figure 7 This is a schematic diagram of the cooling device structure of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 10. Housing; 11. First connecting sleeve; 12. Second connecting sleeve; 13. Heat exchange tube; 14. Fin; 15. T-pipe one; 16. T-pipe two; 17. Reversing component; 171. Positioning seat; 172. Positioning rod; 173. Sealing tube; 174. Piston; 175. First valve plate; 176. First spring; 177. Second valve plate; 178. Second spring; 20. Fan tube; 21. First magnet; 22. Base; 23. Sleeve; 24. Outer fan blades; 30. Connecting pipe; 31. Pipe body; 32. Sealing ring; 33. U-shaped rod; 40. Exhaust fan; 41. Second magnet; 42. Drive shaft; 43. Boss; 44. Axial fan; 50. Cooling device; 51. Circuit pipe; 52. Cooling box; 53. Heat dissipation pipe; 54. Dustproof net. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Example 1

[0022] like Figure 1- Figure 7 As shown, the present invention relates to an explosion-proof junction box, comprising a sealed explosion-proof enclosure 10, wherein the enclosure cover and the enclosure 10 are fitted together by a precision-machined explosion-proof mating surface to ensure that it meets the required explosion-proof level.

[0023] The top and bottom surfaces of the housing 10 are integrally formed with a first connecting sleeve 11 and a second connecting sleeve 12, respectively. This integral structure reduces the sealing risks that may arise from opening holes or welding on the housing 10 body, ensuring the sealing performance and structural strength of the main explosion-proof cavity. In this embodiment, the first connecting sleeve 11 and the second connecting sleeve 12 are preferably located on both sides of the housing 10 in the vertical direction to optimize the external airflow field. A heat exchange tube 13 connects the first connecting sleeve 11 and the second connecting sleeve 12, forming a closed heat dissipation circuit outside the housing 10. Fins 14 are fixedly installed on the heat exchange tube 13, greatly increasing the heat exchange area with the outside air. The fins 14 are preferably made of aluminum and are fixed to the outer wall of the housing 10 to enhance the overall structural rigidity.

[0024] A fan cylinder 20 is installed on the first connecting sleeve 11. A connecting pipe 30 is provided inside the fan cylinder 20 for connecting to the heat exchange tube 13. An exhaust component 40 is rotatably installed inside the connecting pipe 30 via a bearing. Several first magnets 21 are uniformly fixed to the inner wall of the fan cylinder 20. Several second magnets 41 are uniformly fixed to the exhaust component 40. The first magnets 21 and the second magnets 41 are arranged opposite to each other so as to drive the exhaust component 40 to rotate inside the connecting pipe 30 through magnetic coupling.

[0025] The heat generated by the electrical components inside the explosion-proof enclosure 10 during operation heats the air and walls inside the enclosure through convection and radiation. The heat is then efficiently conducted to the fins 14 through the walls of the enclosure 10 for heat exchange.

[0026] When there is natural wind in the environment, it acts on the fan cylinder 20, causing the fan cylinder 20 to rotate around its axis. The first magnet 21 fixed on the inner wall of the fan cylinder 20 rotates synchronously. Due to the magnetic coupling effect, the rotating magnetic field passes through the wall of the non-magnetic connecting pipe 30, generating a magnetic drag force on the second magnet 41 enclosed inside the connecting pipe 30. This drives the exhaust component 40 to rotate synchronously without contact. The rotating exhaust component 40 generates induced airflow inside the connecting pipe 30, actively accelerating the hot gas in the housing 10 and drawing it into the entire heat exchange tube 13 circuit, thereby enhancing the convective heat transfer intensity between the hot gas and the external cold air.

[0027] In this implementation, power transmission is achieved through non-contact magnetic coupling, and the heat exchange circuit is completely sealed. There are no rotating shafts penetrating or dynamic sealing points on the explosion-proof enclosure 10 body, maintaining the integrity of the original explosion-proof structure. All moving parts are located on the outside, making maintenance simple. In critical explosion-proof areas, such as inside the enclosure 10 and inside the heat exchange tube 13 circuit, there are no components that may generate sparks or high temperatures, reducing the problem of compromising the explosion-proof integrity due to heat dissipation requirements.

[0028] Reference Figure 3 and Figure 4 The fan cylinder 20 includes a base 22 and a sleeve 23 that can rotate relative to the base 22. The base 22 is fixedly installed to the first connecting sleeve 11 by a flange to ensure stability. The sleeve 23 is mounted on the base 22 by a bearing.

[0029] The first magnet 21 is fixedly installed on the inner wall of the sleeve 23. In this embodiment, the number of the first magnet 21 is preferably four to eight, and they are installed at equal intervals along the circumferential direction. The outer fan blades 24 are installed at equal intervals along the circumferential direction on the outer wall of the sleeve 23, which can efficiently capture natural wind from any direction and convert wind energy into mechanical energy to drive the sleeve 23 to rotate.

[0030] The connecting pipe 30 includes a pipe body 31. A sealing ring 32 is fixedly installed at one end of the pipe body 31 inside the first connecting sleeve 11. When the connecting pipe 30 is installed in place, the sealing ring 32 is tightly pressed against the inner bore step surface of the first connecting sleeve 11 or the mating surface with the base 22, ensuring dynamic and static sealing at the connection between the internal cavity of the connecting pipe 30 and the first connecting sleeve 11, preventing leakage of the working fluid or the entry of external gas. The other end of the pipe body 31 protrudes from the sleeve 23 and is fixedly installed with at least one U-shaped rod 33. The end of the U-shaped rod 33 away from the pipe body 31 is fixed to the base 22. In this way, the U-shaped rod 33, the base 22, and the pipe body 31 form a fixed whole, thereby firmly fixing the pipe body 31 and keeping it stationary when the fan cylinder 20 is working.

[0031] In this embodiment, the number of U-shaped rods 33 is preferably four to five, and they are arranged at equal intervals along the circumference of the base 22. These multiple U-shaped rods 33 distributed at equal intervals along the circumference form a stable spatial truss support structure, which rigidly connects the upper end of the tube 31 to the fixed base 22, effectively preventing the tube 31 from swinging or rotating in any direction, and providing an extremely stable and centered support foundation for the high-speed rotating exhaust component 40 inside.

[0032] Furthermore, since the sleeve 23 and its outer fan blades 24 are rotating components, they are easily disturbed by birds, large debris, or suspended fibers due to long-term exposure to the outdoor environment. Therefore, this invention provides a tensioned dustproof netting in the gap between adjacent U-shaped rods 33. This annular dustproof netting, supported by multiple U-shaped rods 33 as a framework, forms an effective protective cover without affecting natural airflow or hindering the rotation of the outer fan blades 24. It effectively blocks foreign objects such as leaves, plastic bags, birds, and insects from entering the rotating fan cylinder 20 area, preventing potential mechanical obstruction and safety accidents, and significantly improving the operational reliability of the equipment in complex environments.

[0033] The exhaust component 40 includes a drive shaft 42 rotatably mounted inside the connecting pipe 30. Bosses 43 and axial flow fans 44 are fixedly mounted at both ends of the drive shaft 42, respectively. A second magnet 41 is fixedly mounted on the bosses 43. The number of second magnets 41 is the same as the number of first magnets 21. The bosses 43 provide a stable and easy-to-install base for the second magnets 41 and ensure the concentricity of the magnets and the drive shaft 42. The axial flow fan 44 is the core working component for airflow generation. It is usually composed of multiple blades with specific aerodynamic airfoils. These blades are arranged in a circumferential array around the axis of the drive shaft 42. When the drive shaft 42 rotates, it drives the axial flow fan 44 to rotate synchronously.

[0034] Natural wind drives the outer fan blade 24 to rotate, which in turn drives the sleeve 23 and the first magnet 21 fixed therein to rotate. The rotating magnetic field penetrates the wall of the tube body 31, driving the second magnet 41 on the boss 43 to rotate, which in turn drives the transmission shaft 42 to rotate, and finally drives the axial flow fan 44 to rotate. The rotating axial flow fan 44 generates a strong axial induced airflow near the inlet of the heat exchange tube 13 in the connecting pipe 30. This airflow actively and forcibly drives the gas flow in the closed loop formed by the heat exchange tube 13 and the connecting pipe 30. Specifically, it accelerates and pushes the airflow cooled by the condenser section of the heat exchange tube 13 through the entire loop, enhancing the convective heat transfer efficiency inside the loop, so that heat can be dissipated from the box 10 to the outside air more quickly through the heat exchange tube 13 and the fins 14. Example 2

[0035] Reference Figure 2 and Figure 5 and Figure 6 The heat exchange tube 13 has a three-way pipe 15 and a three-way pipe 2 16 connected in series. A reversing component 17 is installed in the internal flow channel of the three-way pipe 15, and a cooling device 50 is connected to the remaining outlet of the three-way pipe 15. A loop pipe 51 is fixedly connected between the cooling device 50 and the remaining outlet of the three-way pipe 2 16.

[0036] In this embodiment, the commutator 17 has two working positions: The first working position is the normal operating position. The flow channel in the commutator 17 is mainly connected to the heat exchange tube 13 and mainly relies on natural wind power to return to the cold end of the housing 10.

[0037] The second working position is the enhanced heat dissipation position. When the reversing component 17 is activated, the flow channel is switched to heat exchange pipe 13 → cooling device 50 → loop pipe 51 → return to the cold end of the housing 10.

[0038] Specifically, it includes a positioning seat 171 fixedly installed inside the three-way pipe 15. The positioning seat 171 is fixedly installed in the valve cavity of the three-way pipe 15 by welding. A positioning rod 172 is fixedly installed on the positioning seat 171. The positioning rod 172 extends axially. A sealing tube 173 is slidably installed inside the positioning seat 171. A piston 174 is installed inside the sealing tube 173. An expansion medium is filled between the sealing tube 173 and the piston 174. The expansion medium is such as paraffin, a specific type of temperature-sensing oil, or a substance that can undergo phase change. The positioning rod 172 abuts against the piston 174. A first valve plate 175 is fixedly installed at one end of the sealing tube 173, corresponding to the normal operating position of closing the heat exchange tube 13 when the flow direction is switched. A first spring 176 is sleeved on the first valve plate 175. The two ends of the first spring 176 are fixed to the first valve plate 175 and the stepped surface of the sealing tube 173, respectively.

[0039] Furthermore, a second valve plate 177 is fixedly installed at the end of the sealing tube 173 away from the first valve plate 175, corresponding to the end of the inlet of the cooling device 50. A second spring 178 is sleeved on the sealing tube 173, and the two ends of the second spring 178 are fixed to the second valve plate 177 and the positioning seat 171, respectively.

[0040] When the temperature inside the explosion-proof junction box is normal and the gas temperature flowing through the tee pipe 15 is low, the expansion medium inside the sealing pipe 173 is in a contracted state, and the thrust generated on the piston 174 is very small. At this time, the elastic force of the second spring 178 dominates, and the second valve plate 177 is tightly pressed against the corresponding valve seat of the positioning seat 171, thereby reliably closing the bypass flow channel to the cooling device 50. At the same time, the second spring 178 pulls the entire sealing pipe 173 assembly to one side through the second valve plate 177. This pulling force is related to the first spring. 176 attempts to balance the force pushing the first valve plate 175 to the other side, resulting in the first valve plate 175 being separated from the valve port on the three-way pipe 15 leading to the main circuit of the heat exchange pipe 13. In this state, the gas will flow along the path: from the hot end of the box 10 → three-way pipe 15 → unobstructed main circuit of the heat exchange pipe 13, dissipating heat through the fins 14 → three-way pipe 16 → returning to the cold end of the box 10, relying entirely on the natural wind of Embodiment 1 for zero-power heat dissipation. The circuit of the cooling device 50 is completely cut off and is in standby mode. When the heat generation inside the box increases or the environment is harsh, resulting in insufficient heat dissipation, and the temperature of the working fluid flowing through the three-way pipe 15 rises to the preset switching temperature, the temperature-sensing expansion medium in the sealing pipe 173 expands significantly due to heat, generating... Due to the strong pressure, the sealing tube 173 moves away from the positioning rod 172 and piston 174, causing the first valve plate 175 to move and finally press tightly against the valve port on the three-way pipe 15 leading to the main circuit of the heat exchange tube 13, thus closing the main circuit. As the sealing tube 173 moves, it also moves the second valve plate 177, causing it to move away from the valve seat pressing on the positioning seat 171, thereby opening the bypass flow channel to the cooling device 50. In this state, the gas flow path is automatically switched to: from the hot end of the housing 10 → three-way pipe 15 → the opened bypass of the cooling device 50 → the loop pipe 51 → three-way pipe 2 16 → back to the cold end of the housing 10. At this time, the cooling device 50 can be started in conjunction to powerfully cool the high-temperature working fluid, and the main circuit of the heat exchange tube 13 is temporarily bypassed.

[0041] Reference Figure 2 and Figure 7 The cooling device 50 includes a sealed cooling box 52 and at least one heat dissipation pipe 53. Preferably, in order to increase the heat exchange area, multiple heat dissipation pipes 53 can be arranged in parallel. The heat dissipation pipes 53 penetrate the cooling box 52 in the horizontal direction, and the outer ring surface of the heat dissipation pipes 53 forms a seal with the cooling box 52. Preferably, the heat dissipation pipes 53 are not arranged horizontally. The inclination angle of the heat dissipation pipes 53 with the horizontal direction is α, and satisfies 6°≤α≤25°.

[0042] High-temperature hot air from the explosion-proof enclosure 10 flows through the heat dissipation pipe 53. The heat of the high-temperature hot air is transferred to the heat dissipation pipe 53 through the pipe wall, causing its temperature to rise. The air inside the cooling box 52 comes into contact with the high-temperature outer surface of the heat dissipation pipe 53 and is heated. The air density decreases after being heated, generating an upward buoyancy. Since the heat dissipation pipe 53 is arranged at an angle, its high and low ends form a clear vertical height difference inside the cooling box 52. This height difference structure, combined with the heated air inside, forms a natural chimney. The hot air heated by the heat dissipation pipe 53 gathers around the heat dissipation pipe 53 and flows upward along the inclined pipe body 31. Cold air from the outside is drawn in from the other end to replenish it, forming a continuous natural convection circulation driven by thermal pressure difference. This cold air flowing from bottom to top across the outer surface of the heat dissipation pipe 53 continuously carries away the heat from the pipe wall, thereby effectively cooling the high-temperature hot air flowing across the surface of the heat dissipation pipe 53.

[0043] The tilt angle α is key to generating sufficient thermo-pressure driving force.

[0044] If the angle is too small, the height difference will be insufficient, the airflow driving force will be weak, and the heat dissipation effect will be poor; if the angle is between 6° and 25°, it can provide strong enough natural convection within a reasonable structural size, thus achieving efficient heat dissipation.

[0045] Furthermore, dust filters 54 are installed at both ends of the heat pipe 53. The dust filters 54 are essential components installed at both ends of the heat pipe 53. Their function is to prevent foreign objects from blocking the internal flow channels when the cooling device 50 is not working, and to ensure the long-term stable operation of the entire heat dissipation system.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof terminal box comprising a box body (10), characterized in that, The top and bottom surfaces of the housing (10) are respectively provided with a first connecting sleeve (11) and a second connecting sleeve (12), and a heat exchange tube (13) is connected between the first connecting sleeve (11) and the second connecting sleeve (12). A fan barrel (20) is installed on the first connecting sleeve (11). A connecting pipe (30) is provided inside the fan barrel (20) for connecting to the heat exchange pipe (13). An exhaust component (40) is rotatably installed inside the connecting pipe (30) via a bearing. Several first magnets (21) are uniformly fixed to the inner wall of the fan barrel (20). Several second magnets (41) are uniformly fixed to the exhaust component (40). The first magnets (21) and the second magnets (41) are arranged opposite to each other so as to drive the exhaust component (40) to rotate inside the connecting pipe (30) through magnetic coupling.

2. An explosion-proof junction box according to claim 1, characterized in that: The fan tube (20) includes a base (22) and a sleeve (23) that can rotate relative to the base (22). The base (22) is fixedly installed with the first connecting sleeve (11). The sleeve (23) is installed on the base (22) by a bearing. The first magnet (21) is fixedly installed on the inner wall of the sleeve (23). The outer fan blades (24) are equidistantly installed on the outer wall of the sleeve (23) along the circumferential direction.

3. An explosion-proof junction box according to claim 2, characterized in that: The connecting pipe (30) includes a pipe body (31), one end of which is located inside the first connecting sleeve (11) is fixedly installed with a sealing ring (32), and the other end of the pipe body (31) protrudes from the sleeve (23) and is fixedly installed with at least one U-shaped rod (33), and the end of the U-shaped rod (33) away from the pipe body (31) is fixed to the base (22).

4. An explosion-proof junction box according to claim 1, characterized in that: The exhaust component (40) includes a drive shaft (42) rotatably installed in a connecting pipe (30). A boss (43) and an axial fan (44) are fixedly installed at both ends of the drive shaft (42). The second magnet (41) is fixedly installed on the boss (43).

5. An explosion-proof junction box according to claim 1, characterized in that: Fins (14) are fixedly installed on the heat exchange tube (13), and the fins (14) are fixed to the outer wall of the box (10).

6. An explosion-proof junction box according to claim 1, characterized in that: The heat exchange tube (13) has a three-way pipe one (15) and a three-way pipe two (16) connected in series. A reversing component (17) is installed in the internal flow channel of the three-way pipe one (15), and a cooling device (50) is connected to the remaining outlet of the three-way pipe one (15). A loop pipe (51) is fixedly connected between the cooling device (50) and the remaining outlet of the three-way pipe two (16).

7. An explosion-proof junction box according to claim 6, characterized in that: The reversing component (17) includes a positioning seat (171) fixedly installed inside a three-way pipe (15), a positioning rod (172) fixedly installed on the positioning seat (171), a sealing tube (173) slidably installed inside the positioning seat (171), a piston (174) installed inside the sealing tube (173), an expansion medium filling the space between the sealing tube (173) and the piston (174), and the positioning rod (172) abutting against the piston (174). A first valve plate (175) is fixedly installed at one end of the sealing tube (173). A first spring (176) is sleeved on the first valve plate (175). The two ends of the first spring (176) are fixed to the first valve plate (175) and the step surface of the sealing tube (173) respectively.

8. The explosion-proof junction box according to claim 7, characterized in that: The sealing tube (173) is fixedly installed with a second valve plate (177) at one end away from the first valve plate (175). A second spring (178) is sleeved on the sealing tube (173). The two ends of the second spring (178) are fixed to the second valve plate (177) and the positioning seat (171) respectively.

9. The explosion-proof junction box according to claim 6, characterized in that: The cooling device (50) includes a cooling box (52) and at least one heat dissipation pipe (53), the heat dissipation pipe (53) passes through the cooling box (52) in a horizontal direction, and the outer ring surface of the heat dissipation pipe (53) forms a seal with the cooling box (52); The tilt angle of the heat dissipation pipe (53) is a, and satisfies 6°≤a≤25°.

10. An explosion-proof junction box according to claim 9, characterized in that: Dustproof mesh (54) is installed at both ends of the heat dissipation pipe (53).

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