Explosion-proof distribution box

Abstract

The invention belongs to the technical field of anti-explosion distribution boxes, and particularly provides an anti-explosion distribution box which comprises a main body, an electrical assembly and a control assembly, the main body is provided with an anti-explosion cavity, and the electrical assembly and a transmission mechanism are both arranged in the anti-explosion cavity. The knob is arranged on the outer side of the explosion-proof cavity and is connected with the transmission mechanism through the rotating shaft so as to drive a knife switch of the circuit breaker to rotate, and on-off control of a circuit is achieved. The transmission mechanism comprises a driving eccentric wheel, a slider and a transmission rod, two ends of the transmission rod are hinged to the slider and the switch blade respectively, the driving eccentric wheel is arranged on one side of the slider, and the knob drives the driving eccentric wheel to rotate through a rotating shaft. Through the transmission mode of the driving eccentric wheel, the sliding block and the transmission rod, the transmission mechanism has a driving state and a disengagement state, automatic tripping of the knife switch is not hindered in the disengagement state, and the use safety is improved.

Description

Technical Field

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

[0002] An explosion-proof distribution box is a type of electrical equipment used to house circuit breakers and other electrical components. Its enclosure is highly airtight, preventing flammable and explosive gases or dust from entering the box and potentially exploding upon contact with sparks. These boxes are commonly used in locations where flammable and explosive gases or dust are present, such as mines, chemical plants, pharmaceutical factories, flour mills, and gas stations.

[0003] In order to meet the explosion-proof requirements, explosion-proof distribution boxes all have circuit breakers installed inside the box, and the box door needs to be opened every time the circuit is turned on or off. In order to solve the above problems, there are explosion-proof distribution box products in the prior art that install the knob switch on the cover of the box, and the transmission between the knob switch and the circuit breaker knife is realized through a series of transmission structures. For example, Chinese patent publication number CN209691703U discloses an explosion-proof cabinet, in which a number of circuit breakers and a number of lever members are arranged in the box cover, and a switch lever is provided on the switch of the circuit breaker; the lever member includes a paddle, a rotating shaft, a rotating handle, a gasket and a nut, and the lever member is connected to the switch (i.e., the knife) of the circuit breaker by transmission. The above-mentioned prior art controls the closing and tripping of the internal circuit breaker by an external rotary handle, and the closing or tripping of the circuit breaker can be controlled without opening the box cover. However, there are the following disadvantages: the rotary handle is connected to the switch of the circuit breaker through a transmission structure. When the switch of the circuit breaker automatically trips due to reasons such as excessive current or short circuit, the transmission structure and the rotary handle will hinder the tripping of the circuit breaker switch, which may prevent the circuit breaker from automatically tripping in time, affecting the safety of use. Summary of the Invention

[0004] An embodiment of the present invention provides an explosion-proof distribution box, which aims to solve the problem in the prior art that a transmission structure and a rotating handle may hinder the tripping of a circuit breaker knife, which may cause the circuit breaker to fail to trip in time.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide an explosion-proof distribution box, comprising:

[0006] The main body has an explosion-proof cavity, the side wall of the main body is provided with a mounting hole, the mounting hole is communicated with the explosion-proof cavity, the side wall of the main body is further provided with a threading tube, the threading tube passes through the wall thickness direction of the main body and is communicated with the explosion-proof cavity;

[0007] an electrical component, disposed in the explosion-proof chamber, the electrical component comprising at least one circuit breaker having a switch for controlling the on and off of a circuit; and

[0008] The control assembly includes a mounting plate, a knob and a transmission mechanism, wherein the mounting plate is provided on the main body, the knob is rotatably provided on the mounting plate, the knob is connected to a rotating shaft, the rotating shaft is horizontally passed through the mounting hole and extends into the explosion-proof cavity, the rotating shaft is sealed and matched with the mounting hole, the transmission mechanism is provided in the explosion-proof cavity, the transmission mechanism includes an active eccentric wheel, a slider and a transmission rod respectively provided in the explosion-proof cavity, the active eccentric wheel is eccentrically connected to the rotating shaft, and the outer peripheral wall of the active eccentric wheel is wrapped and covered with a flexible damping layer; the slider is provided on one side of the active eccentric wheel and can slide in the up and down directions; the upper end of the transmission rod is hinged to the gate knife, and the lower end is hinged to the upper end of the slider;

[0009] The transmission mechanism has a driving state and a disengaging state. When in the driving state, the outer peripheral wall of the active eccentric wheel abuts against the side wall of the slider. When in the disengaging state, there is a gap between the outer peripheral wall of the active eccentric wheel and the slider.

[0010] In a possible implementation, a slide rail is provided inside the explosion-proof chamber along an up-down direction, and the slider is slidably disposed on the slide rail.

[0011] In one possible implementation, the transmission mechanism further includes a driven eccentric wheel, the outer peripheral wall of the driven eccentric wheel is covered with a flexible damping layer, the driven eccentric wheel and the driving eccentric wheel are arranged relative to the slider, and the driving eccentric wheel and the driven eccentric wheel are connected via a gear set.

[0012] In a possible implementation, the subject includes:

[0013] A bottom shell having a first accommodating cavity, wherein the electrical components and the threading tube are respectively arranged on the bottom shell; and

[0014] The box cover has a second accommodating cavity, and the box cover is arranged on the opening of the first accommodating cavity. The joint surface of the box cover and the bottom shell is sealed and matched. The first accommodating cavity and the second accommodating cavity together form the explosion-proof cavity. The box cover is provided with the mounting hole, and the mounting plate, the knob and the transmission mechanism are respectively arranged on the box cover.

[0015] In a possible implementation, the bottom shell includes:

[0016] A bottom plate, wherein the bottom plate has a square outline and is provided with fixing holes for installing fixing bolts;

[0017] Four first side panels are respectively connected to the four sides of the base plate, the outline of the first side panels is an isosceles trapezoid, the base plate and the four first side panels together enclose the first accommodating cavity, and the cross-sectional area of ​​the first accommodating cavity gradually expands outward along its opening direction, at least one of the first side panels is provided with a threading hole, and the threading tube is threadedly provided in the threading hole; and

[0018] The first flange plate is in a square ring shape and is arranged around the outer periphery of the four first side plates.

[0019] In a possible implementation, the box cover includes:

[0020] A cover plate, wherein the cover plate has a square outline, the mounting hole is provided on the cover plate, and the mounting plate, the knob and the transmission mechanism are respectively provided on the cover plate;

[0021] Four second side panels are respectively connected to the four sides of the cover plate, the outline of the second side panels is an isosceles trapezoid, the cover plate and the four second side panels together enclose the second accommodating cavity, and the cross-sectional area of ​​the second accommodating cavity gradually expands outward along its opening direction; and

[0022] The second flange plate is in a square ring shape and is arranged around the outer periphery of the four second side plates.

[0023] In one possible implementation, a control cavity is further provided on the outer wall of the main body on the side where the mounting hole is opened, and a box door is movably provided at the opening of the control cavity. The box door has an observation window, and the mounting plate and the knob are respectively accommodated in the control cavity, and the box door has a transparent observation window.

[0024] In one possible implementation, a pressure monitoring element and a temperature monitoring element are provided in the explosion-proof chamber, and the main body is further provided with a first gas nozzle and a second gas nozzle, the first gas nozzle and the second gas nozzle are respectively connected to the explosion-proof chamber, the first gas nozzle is connected to an inert gas source, and the second gas nozzle is connected to an electrically controlled air release valve, the temperature monitoring element is respectively communicated with the electrically controlled air release valve and the inert gas source, and the pressure monitoring element is respectively communicated with the electrically controlled air release valve and the inert gas source.

[0025] In one possible implementation, the main body is further provided with a pressure relief port connected to the explosion-proof cavity, and the pressure relief port is connected to a pressure relief tank through a pressure relief pipe. A pressure relief mechanism is provided in the pressure relief pipe, and the pressure relief mechanism is used to control the on and off of the pressure relief pipe. When the pressure relief mechanism is in a closed state, the air pressure in the pressure relief tank is lower than the air pressure in the explosion-proof cavity.

[0026] In a possible implementation, the pressure relief pipe is detachably provided at the pressure relief port, and the pressure relief mechanism includes:

[0027] A first support plate is provided in the pressure relief pipe and has an air inlet passage running through its thickness;

[0028] a second support plate, disposed within the pressure relief pipe and located on the air inlet side of the first support plate, the second support plate having an air inlet hole and an air extraction hole extending through the thickness of the second support plate, the air extraction hole being provided with a third air nozzle, the third air nozzle being located on a side of the second support plate facing away from the first support plate;

[0029] a valve stem, slidably disposed between the first support plate and the second support plate along the axial direction of the pressure relief pipe; and

[0030] A pressure spring is sleeved on the outer circumference of the valve stem, one end of the pressure spring abuts against the valve stem, and the other end abuts against the first support plate. The pressure spring is in a compressed state, and the pressure spring applies a pre-pressure to the valve stem so that the end of the valve stem abuts against the air inlet hole.

[0031] Compared with the prior art, the explosion-proof distribution box provided by the present invention has the following beneficial effects:

[0032] The explosion-proof distribution box provided by the present invention includes a main body, electrical components, and a control component. The main body has an explosion-proof cavity, and the electrical components and transmission mechanism are both arranged within the explosion-proof cavity. During operation, they will not come into contact with flammable and explosive objects outside, thus achieving explosion-proof effects. A knob is arranged on the outside and connected to the transmission mechanism via a rotating shaft, thereby driving the circuit breaker's blade to rotate, thereby achieving circuit on / off control. The transmission mechanism includes an active eccentric wheel, a slider, and a transmission rod. The two ends of the transmission rod are respectively hinged to the slider and the blade. The active eccentric wheel is arranged on one side of the slider, and the knob drives the active eccentric wheel to eccentrically rotate via the rotating shaft. During the rotation of the active eccentric wheel, when the active eccentric wheel rotates to the driving state, the flexible damping layer contacts the slider, which can drive the slider to move upward or downward, and transmits force to the blade via the transmission rod, thereby controlling the blade to close the switch upward or drop the switch downward. The circuit breaker can be controlled to be energized or disconnected by the external knob. When the knife is moved into position, the knob controls the active eccentric to rotate to a disengaged state where it is not in contact with the slider. If the knife is tripped due to an unexpected situation after closing, the active eccentric will not prevent the knife from tripping, allowing the circuit to be disconnected in a timely manner, thereby ensuring the safety of the explosion-proof distribution box. The present invention uses the active eccentric, slider, and transmission rod to enable the transmission mechanism to have a driving state and a disengaged state. In the disengaged state, the automatic tripping of the knife is not hindered, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1A three-dimensional diagram of an explosion-proof distribution box provided in an embodiment of the present application;

[0034] Figure 2 A vertical cross-sectional view of an explosion-proof distribution box provided in an embodiment of the present application;

[0035] Figure 3 for Figure 2 Cross-sectional view in the AA direction;

[0036] Figure 4 Explosion-proof disassembly of the explosion-proof distribution box provided in the embodiment of the present application Figure 1 ;

[0037] Figure 5 for Figure 4 A partial enlarged view of part B in the middle;

[0038] Figure 6 Explosion-proof disassembly of the explosion-proof distribution box provided in the embodiment of the present application Figure 2 ;

[0039] Figure 7 for Figure 6 A partial enlarged view of the middle C part;

[0040] Figure 8 This is a vertical cross-sectional view of the pressure relief tank in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 10. Main body; 11. Bottom shell; 111. Threading tube; 112. Bottom plate; 113. First side panel; 114. First flange plate; 115. Fixing hole; 12. Box cover; 121. Mounting hole; 122. Cover plate; 123. Second side panel; 124. Second flange plate; 125. Slide rail; 13. Box door; 14. First air nozzle; 15. Second air nozzle; 16. Electric air release valve; 17. Pressure relief port; 20. Circuit breaker; 21. Switch 30. Control assembly; 31. Mounting plate; 32. Knob; 321. Rotating shaft; 33. Transmission mechanism; 331. Active eccentric; 332. Slider; 333. Transmission rod; 334. Driven eccentric; 40. Pressure relief pipe; 41. First support plate; 411. Air intake channel; 42. Second support plate; 421. Air intake hole; 422. Air extraction hole; 423. Third air nozzle; 43. Valve stem; 44. Pressure spring; 50. Pressure relief tank. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] Please also refer to Figures 1 to 8 , the following describes an explosion-proof distribution box provided by an embodiment of the present invention.

[0045] See also Figures 1 to 8 The embodiment of the present invention provides an explosion-proof distribution box for installation in an environment with flammable and explosive gases or dust, and specifically includes a main body 10, electrical components and a control component 30. The main body 10 has an explosion-proof cavity, and a mounting hole 121 is provided on the side wall of the main body 10. The mounting hole 121 is connected to the explosion-proof cavity. The side wall of the main body 10 is also provided with a threading tube 111. The threading tube 111 passes through the wall thickness direction of the main body 10 and is connected to the explosion-proof cavity; the electrical components are arranged in the explosion-proof cavity, and the electrical components include at least one circuit breaker 20. The circuit breaker 20 has a knife 21 for controlling the on and off of the circuit; the control component 30 includes a mounting plate 31, a knob 32 and a transmission mechanism 33. The mounting plate 31 is provided on the main body 10, and the knob 32 is rotatably provided on the mounting plate 31. The knob 32 is connected to a rotating shaft 321. The rotating shaft 321 is horizontally passed through the mounting hole 121 and extends into the explosion-proof cavity. The rotating shaft 321 is sealed with the mounting hole 121. In coordination, the transmission mechanism 33 is arranged in the explosion-proof cavity. The transmission mechanism 33 includes an active eccentric wheel 331, a slider 332 and a transmission rod 333 respectively arranged in the explosion-proof cavity. The active eccentric wheel 331 is eccentrically connected to the rotating shaft 321, and the outer peripheral wall of the active eccentric wheel 331 is covered with a flexible damping layer; the slider 332 is arranged on one side of the active eccentric wheel 331 and can slide in the up and down directions; the upper end of the transmission rod 333 is hinged to the gate knife 21, and the lower end is hinged to the upper end of the slider 332; the transmission mechanism 33 has a driving state and a disengaged state. When in the driving state, the outer peripheral wall of the active eccentric wheel 331 abuts against the side wall of the slider 332. When in the disengaged state, there is a gap between the outer peripheral wall of the active eccentric wheel 331 and the slider 332.

[0046] Compared with the prior art, the explosion-proof distribution box provided by the embodiment of the present invention has the following beneficial effects:

[0047] The explosion-proof distribution box provided in an embodiment of the present invention includes a main body 10, electrical components, and a control component 30. The main body 10 has an explosion-proof cavity. The electrical components and the transmission mechanism 33 are both arranged in the explosion-proof cavity. During operation, they will not come into contact with flammable and explosive objects in the outside world, thereby playing an explosion-proof role. The knob 32 is arranged on the outside and is connected to the transmission mechanism 33 via a rotating shaft 321, thereby driving the knife 21 of the circuit breaker 20 to rotate, thereby achieving on-off control of the circuit. The transmission mechanism 33 includes an active eccentric wheel 331, a slider 332, and a transmission rod 333. The two ends of the transmission rod 333 are respectively hinged to the slider 332 and the knife 21. The active eccentric wheel 331 is arranged on one side of the slider 332. The knob 32 drives the active eccentric wheel 331 to rotate eccentrically via the rotating shaft 321. During the rotation of the active eccentric 331, when the active eccentric 331 rotates to the driven state, the flexible damping layer contacts the slider 332, driving the slider 332 upward or downward. This force is then transmitted to the knife 21 via the transmission rod 333, thereby controlling the knife 21 to close upward or close downward. The circuit breaker 20 can be energized or disconnected via the external knob 32. After the knife 21 is moved into position, the knob 32 controls the active eccentric 331 to rotate to a disengaged state where it is not in contact with the slider 332. If the knife 21 trips unexpectedly after closing, the active eccentric 331 will not prevent the knife 21 from tripping, allowing the circuit to be disconnected in a timely manner. This ensures the safety of the explosion-proof distribution box. In this embodiment of the present invention, the transmission mechanism 33 has a driven state and a disengaged state through the transmission method of the active eccentric 331, the slider 332, and the transmission rod 333. In the disengaged state, the automatic tripping of the knife 21 is not hindered, thereby improving safety.

[0048] In the embodiment of the present invention, the main body 10 can be made of common materials used in explosion-proof distribution boxes, such as aluminum alloy, carbon steel, and stainless steel, and can have a square or cylindrical shape. Electrical components such as the circuit breaker 20, copper busbar, and disconnector are mounted within the explosion-proof cavity using brackets, screws, and the like. A conduit 111 is provided for the wiring to pass through. The specific model and configuration of the electrical components are not limited; most commercially available circuit breakers have an automatic trip function. The specific layout of the electrical components within the explosion-proof distribution box can be customized based on user needs, selecting from commercially available options.

[0049] It should be noted that the locations connected to the outside world such as the installation hole 121 should be sealed with rubber plugs, sealing rings or sealing materials, and the unused wire threading pipes 111 should also be sealed with sealing materials to isolate the explosion-proof cavity from the outside air and achieve explosion-proof.

[0050] The control assembly 30 is mounted on the main body 10 and includes a mounting plate 31 and a knob 32 located outside the explosion-proof chamber, as well as a transmission mechanism 33 located inside the explosion-proof chamber. A sealing ring or other seal is used between the rotating shaft 321 and the mounting hole 121 to provide explosion-proof sealing. The mounting plate 31 is fixed to the main body 10 using screws or other fasteners. The knob 32 is rotatably mounted on the mounting plate 31. Indicators can be provided on the mounting plate 31 to indicate the corresponding state of the transmission mechanism 33 when the knob 32 is rotated to a certain angle.

[0051] The transmission mechanism 33 is used to transmit the rotational force generated by turning the knob 32 to the blade 21 of the circuit breaker 20, driving the blade 21 upward to close or downward to trip the circuit breaker. The transmission mechanism 33 specifically comprises an active eccentric 331, a slider 332, and a transmission rod 333. The slider 332 is movable up and down. The upper end of the slider 332 is rotationally connected to the lower end of the transmission rod 333. The blade 21 is rotationally connected to the upper end of the transmission rod 333, forming a connecting rod-slider 332 mechanism. Upward movement of the slider 332 causes the blade 21 to rotate upward to close the circuit breaker. Downward movement of the slider 332 causes the blade 21 to rotate downward to trip the circuit breaker.

[0052] The active eccentric 331 is rotatably arranged with respect to the rotating shaft 321, and the rotating shaft 321 can drive the active eccentric 331 to rotate. The outer peripheral wall of the active eccentric 331 is coated with a flexible damping layer. The flexible damping layer can be made of a material such as rubber, silicone, or polyurethane composite material that has elastic deformation ability and can return to its original shape after being squeezed.

[0053] When the active eccentric 331 is in the driving state, the outer peripheral wall of the active eccentric 331 abuts the side wall of the slider 332, the flexible damping layer is squeezed and elastically deformed, and friction exists between the flexible damping layer and the side wall of the slider 332. The rotation of the active eccentric 331 can drive the slider 332 to move up and down. When the active eccentric 331 is in the disengaged state, the flexible damping layer does not contact the slider 332. When the circuit breaker automatically trips due to a circuit malfunction, the active eccentric 331 will not hinder the descent of the slider 332.

[0054] It is understood that the slider 332 and transmission rod 333 should be made of lightweight materials and structures, such as carbon fiber or plastic. They can be hollow to further reduce weight. The weight of the slider 332 and transmission rod 333 should be less than the driving force required to rotate the gate blade 21 from top to bottom and close the gate. In other words, when the slider 332 and transmission rod 333 are suspended on the gate blade 21, gravity will not cause the gate blade 21 to close.

[0055] As needed, multiple circuit breakers 20 can be set in the explosion-proof distribution box. The multiple circuit breakers 20 correspond to the multiple control components 30 one by one and do not affect each other.

[0056] See also Figure 6 and Figure 7 In some possible embodiments, a slide rail 125 is provided inside the explosion-proof chamber along the up and down directions, and the slider 332 is slidably provided on the slide rail 125 to guide the slider 332 when it moves up and down. The slide rail 125 and the slider 332 should be relatively smooth to reduce the resistance to the movement of the slider 332.

[0057] See also Figure 3 、 Figure 5 and Figure 7 In some possible embodiments, the transmission mechanism 33 further includes a driven eccentric wheel 334. The outer peripheral wall of the driven eccentric wheel 334 is covered with a flexible damping layer. The driven eccentric wheel 334 and the driving eccentric wheel 331 are arranged relative to the slider 332. The driving eccentric wheel 331 and the driven eccentric wheel 334 are connected by a gear set. The driving eccentric wheel 331 and the driven eccentric wheel 334 move synchronously, which helps to ensure that the slider 332 is subjected to stable force.

[0058] See also Figure 1 、 Figure 2 、 Figure 4 and Figure 6 In some possible embodiments, the main body 10 includes a bottom shell 11 and a cover 12. The bottom shell 11 has a first accommodating cavity, in which the electrical components and the conduit 111 are respectively disposed. The cover 12 has a second accommodating cavity, which covers the opening of the first accommodating cavity. The joint surface of the cover 12 and the bottom shell 11 is sealed, and the first and second accommodating cavities together form an explosion-proof cavity. The cover 12 has a mounting hole 121, and a mounting plate 31, a knob 32, and a transmission mechanism 33 are respectively disposed on the cover 12.

[0059] In this embodiment, the bottom shell 11 and the cover 12 enclose the main body 10. The bottom shell 11 and the cover 12 can be manufactured by machining, welding, casting, stamping, etc. The joint surface of the bottom shell 11 and the cover 12 can be connected together by bolting, clamping, bonding, etc. To improve the sealing and explosion-proof effect, the joint surface of the bottom shell 11 and the cover 12 should be provided with a sealant, a sealing gasket, etc.

[0060] In order to fix the electrical components, a bracket can be provided on the bottom shell 11 . The bracket is detachably connected to the bottom shell 11 , and the electrical components are mounted on the bracket.

[0061] Conventional explosion-proof distribution boxes are mostly square or cylindrical in shape. After being manufactured in the factory, they need to be transported to the customer's designated location for installation. These finished boxes are bulky and difficult to stack, often requiring larger vehicles for transport. This prevents shipping large quantities at once, resulting in high transportation costs.

[0062] In some possible embodiments, to facilitate handling and transportation while saving space in transportation equipment, the bottom shell 11 includes a bottom plate 112, four first side plates 113, and a first flange plate 114. The bottom plate 112 has a square outline and is provided with fixing holes 115 for installing fixing bolts. The four first side plates 113 are respectively connected to the four sides of the bottom plate 112. The outline of the first side plates 113 is an isosceles trapezoid. The bottom plate 112 and the four first side plates 113 together form a first accommodating cavity, and the cross-sectional area of ​​the first accommodating cavity gradually expands outward along its opening direction. At least one of the first side plates 113 has a threading hole, and the threading tube 111 is threadedly provided in the threading hole. The first flange plate 114 is a square ring and is provided around the outer periphery of the four first side plates 113.

[0063] Similarly, the box cover 12 includes a cover plate 122, four second side plates 123, and a second flange plate 124. The cover plate 122 has a square outline and is provided with a mounting hole 121. The slide rail 125, mounting plate 31, knob 32, and transmission mechanism 33 are respectively provided on the cover plate 122. The four second side plates 123 are respectively connected to the four sides of the cover plate 122. The outline of the second side plates 123 is an isosceles trapezoid. The cover plate 122 and the four second side plates 123 together enclose a second accommodating cavity, and the cross-sectional area of ​​the second accommodating cavity gradually expands outward along its opening direction. The second flange plate 124 is a square ring and is provided around the outer periphery of the four second side plates 123.

[0064] In the above embodiment, both the bottom shell 11 and the cover 12 are tapered components that can be stacked together during transportation to reduce space usage. Specifically, multiple bottom shells 11 can be stacked one above the other, with the openings facing upward. Multiple covers 12 can also be stacked one above the other, with the openings facing upward. This arrangement saves transportation space and reduces transportation costs.

[0065] In order to prevent the protruding threading tube 111 from influencing the stacking of the bottom shell 11, the threading tube 111 cooperates with the threading hole through a thread, and the threading tube 111 is installed again during assembly. In order to ensure sealing, the inner wall of the threading tube 111 and the threading hole can be coated with thread sealant.

[0066] See also Figure 1 、 Figure 2 and Figure 5In some possible embodiments, the outer wall of the main body 10 on the side where the mounting hole 121 is formed further defines a control chamber. A door 13 is movably provided at the opening of the control chamber. Door 13 has an observation window. The mounting plate 31 and knob 32 are each housed within the control chamber. Door 13 has a transparent observation window. Door 13 can be locked using a lock, allowing inspection personnel to directly observe the operating status of each instrument within the control chamber through the transparent observation window.

[0067] During operation, the electrical components inside the explosion-proof distribution box will generate heat. Due to the sealing and explosion-proof requirements of the explosion-proof distribution box, the heat generated by the electrical components cannot be dissipated in time, which may cause overheating and damage. To solve the above problem, please refer to Figure 3 and Figure 6 In some possible embodiments, a pressure monitoring element and a temperature monitoring element are provided in the explosion-proof chamber, and the main body 10 is further provided with a first gas nozzle 14 and a second gas nozzle 15. The first gas nozzle 14 and the second gas nozzle 15 are respectively connected to the explosion-proof chamber, the first gas nozzle 14 is connected to an inert gas source, and the second gas nozzle 15 is connected to an electrically controlled air release valve 16. The temperature monitoring element is respectively communicated with the electrically controlled air release valve 16 and the inert gas source, and the pressure monitoring element is respectively communicated with the electrically controlled air release valve 16 and the inert gas source.

[0068] In this embodiment, the communication connection refers to an electrical control connection and a signal connection. When the temperature monitoring element detects a high temperature, a lower temperature inert gas, such as nitrogen, can be introduced into the interior through the inert gas source and the first gas nozzle 14 to reduce the temperature. Simultaneously, the electronically controlled purge valve 16 is controlled to discharge the gas, thereby maintaining a stable pressure within the explosion-proof chamber. When the pressure monitoring element detects a high internal pressure, the electronically controlled purge valve 16 can be used to partially discharge the gas, or the inert gas source can be controlled to stop supplying gas.

[0069] The pressure monitoring element and the temperature monitoring element in this embodiment are both air pressure sensors and temperature sensors in the prior art. The first air nozzle 14 and the second air nozzle 15 are both air nozzles in the prior art and can be used for inflation or deflation. The first air nozzle 14 is connected to an inert gas source for inflation. During normal use of the explosion-proof distribution box, the inert gas source fills the explosion-proof cavity with inert gas (such as nitrogen) through the first air nozzle 14, and makes the air pressure greater than the external atmospheric pressure, forming positive pressure protection. The second air nozzle 15 is used for deflation, and an electrically controlled deflation valve 16 is provided at the air outlet end of the second air nozzle 15, which can control the second air nozzle 15 to deflate when needed.

[0070] This arrangement allows the explosion-proof chamber to be filled with inert gas via the first air nozzle 14 and the inert gas source. The inert gas pressure is greater than the external atmospheric pressure, creating positive pressure protection. This pressure prevents flammable and explosive gases from entering the chamber, ensuring the safety of the equipment. Furthermore, when the temperature monitoring element detects that the temperature inside the explosion-proof chamber is too high, the second air nozzle 15 and the electric purge valve release the gas. Simultaneously, the first air nozzle 14 and the inert gas source replenish the chamber with low-temperature inert gas, cooling the chamber and achieving two goals at once.

[0071] During the operation of the explosion-proof distribution box, an arc may occur due to circuit aging or failure. The high energy released by the arc will rapidly expand the air, generating a strong shock wave, which may cause deformation or rupture of the main body 10. At the same time, the shock wave may also damage the internal electrical components. Therefore, it is necessary to provide a pressure relief vent 17 to release the energy generated by the shock wave caused by the arc.

[0072] To achieve pressure relief of explosion-proof distribution box, please refer to Figure 4 、 Figure 6 and Figure 7 In some possible embodiments, the main body 10 is further provided with a pressure relief vent 17 connected to the explosion-proof chamber. The pressure relief vent 17 should be designed to be large so that the suddenly expanding air can enter the vent 17 as quickly and as much as possible. The pressure relief vent 17 is connected to a pressure relief tank 50 via a pressure relief pipe 40. The pressure relief pipe 40 is provided with a pressure relief mechanism that controls the on / off state of the pressure relief pipe 40. When the pressure relief mechanism is in a closed state, the air pressure in the pressure relief tank 50 is lower than the air pressure in the explosion-proof chamber. The pressure relief mechanism can be an electromagnetic air circuit on / off valve or a mechanical on / off valve. When an arc occurs in the explosion-proof chamber, causing gas expansion, the pressure relief mechanism opens, allowing the expanded gas to enter the pressure relief tank 50, achieving pressure relief. The pressure relief tank 50 is a sealed tank body that prevents the electrical components in the explosion-proof chamber from contacting the outside world, thereby achieving a sealed explosion-proof effect.

[0073] See also Figure 8In some possible embodiments, the pressure relief pipe 40 is detachably provided at the pressure relief port 17 , the pressure relief tank 50 is welded at the air inlet of the pressure relief tank 50 , and the pressure relief mechanism includes a first support plate 41 , a second support plate 42 , a valve stem 43 and a pressure spring 44 . The first support plate 41 is arranged in the pressure relief pipe 40 and has an air intake channel 411 that passes through its own thickness; the second support plate 42 is arranged in the pressure relief pipe 40, located on the air intake side of the first support plate 41, that is, the side adjacent to the pressure relief port 17, the second support plate 42 has an air intake hole 421 and an air exhaust hole 422 that pass through its own thickness, the air exhaust hole 422 is provided with a third air nozzle 423, and the third air nozzle 423 is located on the side of the second support plate 42 away from the first support plate 41; the valve stem 43 is arranged between the first support plate 41 and the second support plate 42 to slide along the axial direction of the pressure relief pipe 40; the pressure spring 44 is sleeved on the outer periphery of the valve stem 43, one end of the pressure spring 44 abuts the valve stem 43, and the other end abuts the first support plate 41. The pressure spring 44 is in a compressed state, and the pressure spring 44 applies a pre-pressure to the valve stem 43 so that the end of the valve stem 43 abuts against the air intake hole 421.

[0074] In this embodiment, a plurality of air inlet holes 421 may be provided, and a plurality of valve stems 43 , pressure springs 44 and air inlet holes 421 may be provided correspondingly.

[0075] The pressure relief mechanism in this embodiment employs a mechanical structure. During normal operation, the pressure relief tank 50 is under negative pressure, the third gas nozzle 423 of the air extraction hole 422 is blocked, and the valve stem 43, under the action of the pressure spring 44, abuts against the air inlet 421, sealing the air inlet 421. When the arc causes the gas in the explosion-proof chamber to expand and the pressure becomes excessive, this pressure overcomes the preload of the pressure spring 44, pushing the valve stem 43 open and allowing the expanded gas to enter the pressure relief tank 50, thereby releasing the pressure.

[0076] To maintain a negative pressure within the pressure relief tank 50 and absorb more expanded high-pressure gas, the second support plate 42 is provided with an air extraction hole 422, within which is a third air nozzle 423. Before installing the pressure relief pipe 40 and the pressure relief tank 50, first connect the third air nozzle 423 to an air pump to extract the air from the pressure relief tank 50, creating a negative pressure inside the pressure relief tank 50. After the air is extracted, seal the third air nozzle 423, and then install the pressure relief pipe 40 to the pressure relief port 17. The pressure relief pipe 40 and the pressure relief port 17 can be connected via a flange, with sealant applied to the joint surface to ensure a seal.

[0077] During normal operation, pressure spring 44 forces valve stem 43 against air inlet 421, sealing it. When pressure relief is required, the pressure overcomes the preload of pressure spring 44, forcing valve stem 43 open. The specific preload of pressure spring 44 is not limited and can be set by the user to meet their needs.

[0078] It can be understood that the various parts in the above embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the specification of the present invention has recorded various combination embodiments and can support different combination embodiments.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An explosion-proof distribution box, characterized in that: include: The main body (10) has an explosion-proof cavity. The side wall of the main body (10) is provided with a mounting hole (121), the mounting hole (121) is communicated with the explosion-proof cavity, and the side wall of the main body (10) is further provided with a threading tube (111), the threading tube (111) passes through the wall thickness direction of the main body (10) and is communicated with the explosion-proof cavity. An electrical component is arranged in the explosion-proof cavity, the electrical component comprising at least one circuit breaker (20), the circuit breaker (20) having a switch (21) for controlling the on and off of a circuit; as well as A control assembly (30) includes a mounting plate (31), a knob (32) and a transmission mechanism (33), wherein the mounting plate (31) is provided on the main body (10), the knob (32) is rotatably provided on the mounting plate (31), the knob (32) is connected to a rotating shaft (321), the rotating shaft (321) is horizontally provided through the mounting hole (121) and extends into the explosion-proof cavity, the rotating shaft (321) is sealed with the mounting hole (121), and the transmission mechanism (33) includes a rotating shaft (321) and a rotating shaft (321) extending from the rotating shaft (321) to the rotating shaft (321). The invention comprises an active eccentric wheel (331), a slider (332) and a transmission rod (333) respectively arranged in the explosion-proof cavity, wherein the active eccentric wheel (331) is eccentrically connected to the rotating shaft (321), and the outer peripheral wall of the active eccentric wheel (331) is covered with a flexible damping layer; the slider (332) is arranged on one side of the active eccentric wheel (331) and can slide in the up and down directions; the upper end of the transmission rod (333) is hinged to the gate knife (21), and the lower end is hinged to the upper end of the slider (332); The transmission mechanism (33) has a driving state and a disengaging state. When in the driving state, the outer peripheral wall of the active eccentric wheel (331) abuts against the side wall of the slider (332). When in the disengaging state, a gap exists between the outer peripheral wall of the active eccentric wheel (331) and the slider (332).

2. The explosion-proof distribution box according to claim 1, characterized in that: A slide rail (125) is provided inside the explosion-proof chamber along the up-down direction, and the slider (332) is slidably arranged on the slide rail (125).

3. An explosion-proof distribution box according to claim 2, characterized in that: The transmission mechanism (33) further comprises a driven eccentric wheel (334), the outer peripheral wall of the driven eccentric wheel (334) being coated with a flexible damping layer, the driven eccentric wheel (334) and the driving eccentric wheel (331) being arranged relative to each other with respect to the slider (332), and the driving eccentric wheel (331) and the driven eccentric wheel (334) being connected to each other via a gear set.

4. The explosion-proof distribution box according to claim 1, characterized in that: The main body (10) comprises: A bottom shell (11) has a first accommodating cavity, and the electrical components and the threading tube (111) are respectively arranged on the bottom shell (11); and The box cover (12) has a second accommodating cavity. The box cover (12) is arranged to cover the opening of the first accommodating cavity. The joint surface of the box cover (12) and the bottom shell (11) is sealed and matched. The first accommodating cavity and the second accommodating cavity together form the explosion-proof cavity. The box cover (12) is provided with the mounting hole (121). The mounting plate (31), the knob (32) and the transmission mechanism (33) are respectively arranged on the box cover (12).

5. An explosion-proof distribution box according to claim 4, characterized in that: The bottom shell (11) comprises: A bottom plate (112), wherein the bottom plate (112) has a square outline, and a fixing hole (115) is provided on the bottom plate (112), wherein the fixing hole (115) is used to install a fixing bolt; Four first side panels (113) are respectively connected to the four sides of the bottom panel (112); the outline of the first side panels (113) is an isosceles trapezoid; the bottom panel (112) and the four first side panels (113) together enclose the first accommodating cavity, and the cross-sectional area of ​​the first accommodating cavity gradually expands outward along its own opening direction; at least one of the first side panels (113) is provided with a threading hole, and the threading tube (111) is threadedly arranged in the threading hole; and The first flange plate (114) is in a square ring shape and is arranged around the outer periphery of the four first side plates (113).

6. The explosion-proof distribution box according to claim 4, characterized in that: The box cover (12) comprises: A cover plate (122), wherein the cover plate (122) has a square outline, the cover plate (122) is provided with the mounting hole (121), and the mounting plate (31), the knob (32) and the transmission mechanism (33) are respectively arranged on the cover plate (122); Four second side panels (123) are respectively connected to the four sides of the cover plate (122); the outline of the second side panels (123) is an isosceles trapezoid; the cover plate (122) and the four second side panels (123) together enclose the second accommodating cavity, and the cross-sectional area of ​​the second accommodating cavity gradually expands outward along its opening direction; and The second flange plate (124) is in a square ring shape and is arranged around the outer periphery of the four second side plates (123).

7. The explosion-proof distribution box according to claim 1, characterized in that: The outer wall of the main body (10) on the side where the mounting hole (121) is opened is also provided with a control cavity, and a box door (13) is movably provided at the opening of the control cavity. The box door (13) has an observation window, and the mounting plate (31) and the knob (32) are respectively accommodated in the control cavity. The box door (13) has a transparent observation window.

8. The explosion-proof distribution box according to claim 1, characterized in that: A pressure monitoring element and a temperature monitoring element are provided in the explosion-proof chamber. The main body (10) is further provided with a first gas nozzle (14) and a second gas nozzle (15). The first gas nozzle (14) and the second gas nozzle (15) are respectively connected to the explosion-proof chamber. The first gas nozzle (14) is connected to an inert gas source, and the second gas nozzle (15) is connected to an electrically controlled air release valve (16). The temperature monitoring element is respectively connected to the electrically controlled air release valve (16) and the inert gas source for communication. The pressure monitoring element is respectively connected to the electrically controlled air release valve (16) and the inert gas source for communication.

9. The explosion-proof distribution box according to claim 1, characterized in that: The main body (10) is further provided with a pressure relief port (17) connected to the explosion-proof cavity. The pressure relief port (17) is connected to a pressure relief tank (50) via a pressure relief pipe (40). A pressure relief mechanism is provided in the pressure relief pipe (40). The pressure relief mechanism is used to control the on / off of the pressure relief pipe (40). When the pressure relief mechanism is in a closed state, the air pressure in the pressure relief tank (50) is lower than the air pressure in the explosion-proof cavity.

10. The explosion-proof distribution box according to claim 9, characterized in that: The pressure relief pipe (40) is detachably arranged on the pressure relief port (17), and the pressure relief mechanism comprises: A first support plate (41) is disposed in the pressure relief pipe (40) and has an air intake passage (411) extending through the thickness of the first support plate; a second support plate (42) disposed in the pressure relief pipe (40) and located on the air inlet side of the first support plate (41); the second support plate (42) has an air inlet hole (421) and an air extraction hole (422) extending through the thickness of the second support plate; the air extraction hole (422) is provided with a third air nozzle (423); the third air nozzle (423) is located on a side of the second support plate (42) facing away from the first support plate (41); a valve stem (43) slidably disposed between the first support plate (41) and the second support plate (42) along the axial direction of the pressure relief pipe (40); and A pressure spring (44) is sleeved on the outer periphery of the valve stem (43), one end of the pressure spring (44) abuts against the valve stem (43), and the other end abuts against the first support plate (41). The pressure spring (44) is in a compressed state, and the pressure spring (44) applies a pre-pressure to the valve stem (43) so that the end of the valve stem (43) abuts against the air inlet hole (42).

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