A wiring box based on power engineering construction

Abstract

The application discloses a wiring box used for electric power engineering construction and particularly relates to the field of electric power engineering construction, which comprises a wiring box, a ventilation slot is formed in the top of the wiring box, an exhaust fan is installed in the ventilation slot, a mesh cover is installed at the upper end of the ventilation slot, a sealing mechanism for isolating external air is arranged at the upper end in the wiring box, the sealing mechanism comprises a rectangular rail, and the rectangular rail is fixedly installed at the upper end in the wiring box. The wiring box used for electric power engineering construction has the sealing mechanism, when liquid expands, the spring force is overcome to push the left and right electrode plates to be close to each other and be in contact, the external controller is connected to control the action of the electric push rod, the mounting plate is pushed downward through the electric push rod, the left and right gate plates are linearly moved along the rectangular rail through the push rod, the ventilation slot formed in the top of the wiring box is sealed, the wiring box is isolated from external air, and the fire extinguishing efficiency of the wiring box is improved.

Description

Technical Field

[0001] This invention relates to the field of power engineering construction, and in particular to a junction box for power engineering construction. Background Technology

[0002] Electricity is an energy source that uses electrical energy as its power source. The main ways electricity is generated include: thermal power generation (using combustible materials such as coal), solar power generation, large-capacity wind power generation, nuclear power generation, hydrogen power generation, and hydropower generation. Furthermore, the power system is one of the most important achievements in the history of human engineering science. It is an electricity production and consumption system composed of power generation, transmission, transformation, distribution, and consumption. It converts primary energy from nature into electricity through mechanical energy devices, and then supplies the electricity to various users through transmission, transformation, and distribution.

[0003] During power engineering construction, the power supply is usually transferred to different construction areas to ensure people's normal power supply. Therefore, the junction boxes used for power construction are extremely important. However, when existing power junction boxes are in use, due to the large number of voltages or components passing through them, the internal temperature of the junction box is prone to be high, which affects the lifespan of the internal components and is prone to safety accidents. At the same time, because there are many wires inside the junction box, when people trip over the wires, the wires can easily come loose.

[0004] As disclosed in CN113363848A, a junction box for power engineering construction is divided into an external protective box and an internal protective box. The external protective box has an inclined through slot and a slot at the top, so that when air flows through the interior of the external and internal protective boxes, air convection is formed, which ensures that the heat of the internal components of the junction box is carried away and the internal temperature of the junction box is reduced. Furthermore, heat-conducting aluminum plates, heat dissipation plates and air venting plates are set in the external and internal protective boxes, which can conduct the heat from the interior of the internal protective box and carry away the heat through the circulating air, thereby improving the heat dissipation effect, extending the service life of the internal components of the junction box and preventing safety accidents.

[0005] However, when the junction box catches fire during use, the device only uses a fire extinguisher to put out the fire, which is inefficient and can easily cause safety accidents.

[0006] Therefore, we urgently need to provide a junction box for power engineering construction. Summary of the Invention

[0007] The main objective of this invention is to provide a junction box for power engineering construction that can effectively solve the problems mentioned above.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A junction box for power engineering construction includes a junction box with a ventilation slot at the top. An exhaust fan is installed inside the ventilation slot, and a mesh cover is installed at the upper end of the ventilation slot. A sealing mechanism for isolating outside air is provided at the upper end of the junction box. The sealing mechanism includes a rectangular rail, which is fixedly installed at the upper end of the junction box. Symmetrically distributed gate plates are slidably connected to the left and right sides of the rectangular rail. An electric push rod is fixedly installed at the center of the top of the junction box. An mounting plate is fixedly installed at the bottom of the electric push rod. Push rods are rotatably connected to the left and right ends of the top of the mounting plate. The upper ends of the two push rods are rotatably connected to the lower ends of the two gate plates, respectively.

[0009] When the junction box catches fire, the electric push rod pushes the mounting plate down, and the two push rods pull the two gates to seal the ventilation slots, thereby isolating the junction box from the outside air and accelerating the fire extinguishing efficiency of the junction box.

[0010] Preferably, the sealing mechanism further includes a housing, which is fixedly installed inside the top of the junction box. A pipe is connected to the outside of the housing. The pipe is U-shaped and its two ends are connected to the left and right sides of the housing. Springs are fixedly installed on the left and right sides of the inner wall of the housing. Electrode plates are installed on the free ends of the two springs. A sealing ring is fixedly installed on the outside of the electrode plates. The sealing ring abuts against the inner wall of the housing.

[0011] Preferably, the pipe is filled with a heat-expandable liquid. The electric push rod is connected to an external controller. When the junction box catches fire and the internal temperature rises, the liquid expands and overcomes the spring force to push the two electrode plates closer to each other. After the electrode plates contact each other, the controller is turned on to control the electric push rod to move, so that the gate seals the ventilation slot.

[0012] Preferably, the sealing mechanism further includes a base, which is installed on the lower outer side of the junction box. A servo motor is fixedly installed on the right side of the base, and a threaded rod is fixedly installed on the output end of the servo motor. A guide rod is fixedly installed on the inner wall of the base on the back of the threaded rod. Moving plates are symmetrically installed on the left and right sides of the threaded rod and the guide rod. A push plate is rotatably connected to the top of the moving plate. The upper end of the push plate is rotatably connected to the bottom of the junction box for pushing the junction box to move up and down.

[0013] Preferably, the lower outer side of the junction box has evenly distributed heat dissipation grooves, the left and right sides of the threaded rod have external threads in opposite directions, the moving plate is threaded to the outside of the threaded rod, and the servo motor is electrically connected to the controller. After the junction box catches fire, the controller controls the servo motor to rotate, which in turn drives the threaded rod to rotate. With the threaded connection between the moving plate and the threaded rod, the push plate moves the junction box downward, causing the heat dissipation grooves to move into the base and seal the heat dissipation grooves to prevent combustion-supporting gases in the air from entering the junction box.

[0014] Preferably, a fire extinguishing mechanism is provided inside and on the back of the junction box. The fire extinguishing mechanism includes a tank, which is installed on the back of the junction box. A fastening sleeve is installed on the back of the junction box by screws to fix the tank to the back of the junction box. A valve is installed on the top of the tank, and a connecting pipe is connected to the top of the valve. A nozzle is installed on the end of the connecting pipe away from the valve.

[0015] Preferably, the valve is a solenoid valve and is electrically connected to the controller. After the junction box catches fire, the controller controls the opening of the solenoid valve so that the dry powder in the tank is sprayed out from the nozzle to extinguish the fire in the junction box.

[0016] Preferably, the back and interior of the junction box are provided with an adjustment mechanism for adjusting the nozzle angle. The adjustment mechanism includes a cover, which is fixedly installed on the upper part of the back of the junction box. A rotating shaft is rotatably connected inside the cover, and the front end of the rotating shaft extends into the interior of the junction box. A lever is fixedly installed on the front of the rotating shaft, and the lower end of the lever is connected to a connecting pipe. A gear is fixedly installed on the outer side of the back of the rotating shaft. A second servo motor is fixedly installed on the right side of the cover, and a lead screw is fixedly installed at the output end of the second servo motor. A rack that meshes with the gear is slidably connected to the inner wall of the cover, and a protrusion is fixedly installed on the top of the rack.

[0017] Preferably, the protrusion is threaded onto the outside of the lead screw and is used to drive the rack to move linearly left and right. The second servo motor is electrically connected to the controller and is used to control the start and stop of the second servo motor.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. This device, through its designed sealing mechanism, overcomes the spring force when the liquid expands, pushing the left and right electrode plates closer together. This activates the external controller to control the electric push rod, which in turn pushes the mounting plate downwards. Simultaneously, the push rod drives the left and right gates to move linearly along the rectangular track, sealing the ventilation slot at the top of the junction box. This isolates the junction box from the outside air, accelerating the fire extinguishing efficiency of the junction box.

[0019] 2. This device, through its designed adjustment mechanism, uses a servo motor to drive a lead screw to rotate and connect it to a protrusion via a threaded connection. This causes the protrusion to drive a rack to move back and forth linearly. In conjunction with the meshing of the rack and gear, the gear drives a rotating shaft and a lever to swing left and right. When the lever swings, it causes the nozzle to swing, thus causing the nozzle to spray dry powder in a swinging manner, increasing the dry powder coverage area and accelerating the fire extinguishing process at the junction box. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the connection between the junction box and the sealing mechanism of the present invention; Figure 4 This is a partial structural diagram of the sealing mechanism of the present invention; Figure 5 This is a cross-sectional view of the internal structure of the base of the present invention; Figure 6 This is a schematic diagram of the adjustment mechanism of the present invention.

[0021] In the diagram: 1. Junction box; 2. Exhaust fan; 3. Mesh cover; 41. Rectangular rail; 42. Gate; 43. Electric actuator; 44. Mounting plate; 45. Actuator; 46. Housing; 47. Pipe; 48. Spring; 49. Electrode plate; 410. Sealing ring; 51. Base; 52. Servo motor one; 53. Threaded rod; 54. Guide rod; 55. Moving plate; 56. Push plate; 61. Tank; 62. Fastening sleeve; 63. Valve; 64. Connecting pipe; 65. Nozzle; 71. Cover; 72. Rotating shaft; 73. Pulley; 74. Gear; 75. Servo motor two; 76. Lead screw; 77. Rack; 78. Protrusion. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Example 1, as Figures 1-5 As shown, a junction box for power engineering construction includes a junction box 1. A ventilation slot is provided on the top of the junction box 1, and an exhaust fan 2 is installed inside the ventilation slot. A mesh cover 3 is installed at the upper end of the ventilation slot. A sealing mechanism for isolating external air is provided at the upper end of the interior of the junction box 1. The sealing mechanism includes a rectangular rail 41, which is fixedly installed at the upper end of the interior of the junction box 1. Symmetrically distributed gate plates 42 are slidably connected to the left and right sides of the interior of the rectangular rail 41. High-temperature resistant silicone sealing strips are pasted on the sealing surfaces of the gate plates 42. After closing, the gap between the gate plates 42 and the inner wall of the ventilation slot is ≤0.1mm, achieving a complete seal. The rectangular rail 41 is an aluminum alloy sliding groove with a polished inner wall. The sliding resistance of the gate plates 42 is ≤2N. An electric push rod 43 is fixedly installed in the middle of the top of the junction box 1. An mounting plate 44 is fixedly installed at the bottom of the electric push rod 43. Push rods 45 are rotatably connected to the left and right ends of the top of the mounting plate 44. The upper ends of the two push rods 45 are rotatably connected to the lower ends of the two gate plates 42, respectively.

[0024] When junction box 1 catches fire, the electric push rod 43 pushes the mounting plate 44 down, and the two push rods 45 pull the two gates 42 to seal the ventilation slot, thereby isolating junction box 1 from the outside air and accelerating the fire extinguishing efficiency of junction box 1.

[0025] The sealing mechanism also includes a housing 46, which is fixedly installed inside the top of the junction box 1. A pipe 47 is connected to the outside of the housing 46. The pipe 47 is U-shaped and its two ends are connected to the left and right sides of the housing 46. Springs 48 are fixedly installed on the left and right sides of the inner wall of the housing 46. The springs 48 are stainless steel compression springs with a wire diameter of 0.3mm, an outer diameter of 5mm, a free length of 10mm, and a preload of 0.5N-1N to ensure that the expansion force of liquid above 60℃ can push the electrode plate 49 to close. Electrode plates 49 are installed on the free ends of the two springs 48. The two electrode plates 49 are respectively connected to the signal input terminal of the external controller through high-temperature resistant wires. After the electrode plates 49 make contact, a high-level trigger signal is output. A ceramic insulating gasket is used to isolate the electrode plates 49 from the housing 46 to prevent short circuit and false triggering. A sealing ring 410 is fixedly installed on the outside of the electrode plates 49. The sealing ring 410 abuts against the inner wall of the housing 46. The sealing ring 410 is made of silicone rubber or fluororubber and has a temperature resistance of ≥200℃. It is interference-fitted with the inner wall of the housing 46 to prevent leakage of the expanding liquid.

[0026] The pipe 47 is filled with a heat-expandable liquid, which is a thermally conductive expansion oil. The threshold temperature for triggering expansion is 60℃-80℃. It is stable in volume at room temperature and has a volume expansion rate of ≥15% at high temperature. It is non-corrosive and non-conductive. The electric push rod 43 is connected to an external controller. When the internal temperature of the junction box 1 rises due to fire, the liquid expands and overcomes the elastic force of the spring 48 to push the two electrode plates 49 closer to each other. After the electrode plates 49 contact, the controller is turned on and controls the electric push rod 43 to move, so that the gate 42 seals the ventilation slot.

[0027] The sealing mechanism also includes a base 51, which is installed on the lower outer side of the junction box 1. A servo motor 52 drives the junction box 1 to move downward by 20mm-30mm, so that the heat dissipation groove at the lower end of the junction box 1 is completely submerged in the base 51. A fluororubber sealing lip is provided at the upper opening of the base 51 to fit and seal against the outer wall of the junction box 1. A servo motor 52 is fixedly installed on the right side of the base 51. A threaded rod 53 is fixedly installed at the output end of the servo motor 52. A guide rod 54 is fixedly installed on the inner wall of the base 51 behind the threaded rod 53. Moving plates 55 are symmetrically installed on the left and right ends of the threaded rod 53 and the guide rod 54. A push plate 56 is rotatably connected to the top of the moving plate 55. The upper end of the push plate 56 is rotatably connected to the bottom of the junction box 1 to push the junction box 1 to move up and down.

[0028] The lower outer side of the junction box 1 has evenly distributed heat dissipation slots. The threaded rod 53 has external threads in opposite directions on both sides. The moving plate 55 is threaded to the outside of the threaded rod 53. The servo motor 52 is electrically connected to the controller. After the junction box 1 catches fire, the controller controls the servo motor 52 to rotate, which drives the threaded rod 53 to rotate. With the threaded connection between the moving plate 55 and the threaded rod 53, the push plate 56 moves the junction box 1 downward, causing the heat dissipation slots to move into the base 51 and seal the heat dissipation slots to prevent combustion-supporting gases in the air from entering the junction box 1.

[0029] The external controller is an STM32 microcontroller. The trigger logic is as follows: after electrode 49 is closed, the sealing mechanism is activated first, and the fire extinguishing mechanism is activated after a delay of 0.5s, so as to isolate the air first and then spray fire extinguishing.

[0030] Fire extinguishing mechanisms are installed inside and on the back of junction box 1. The fire extinguishing mechanism includes a canister 61, which is installed on the back of junction box 1. The canister 61 is a dry powder fire extinguishing canister, filled with ABC dry powder fire extinguishing agent, with a capacity of 1kg-2kg and a working pressure of 1.2MPa-1.5MPa. It is suitable for fighting fires on power lines. A fastening sleeve 62 is installed on the back of junction box 1 by screws to fix the canister 61 to the back of junction box 1. A valve 63 is installed on the top of the canister 61, and a connecting pipe 64 is connected to the top of the valve 63. A nozzle 65 is installed on the end of the connecting pipe 64 away from the valve 63. The connecting pipe 64 is a metal corrugated pipe with a temperature resistance of ≥250℃ and can be bent and deformed. The nozzle 65 is a wide-angle atomizing nozzle with a spray angle of 60°-90° and a dry powder coverage diameter of ≥300mm.

[0031] Valve 63 is a solenoid valve and is electrically connected to the controller. After the junction box 1 catches fire, the controller controls the opening of the solenoid valve, so that the dry powder in the tank 61 is sprayed out by the nozzle 65 to extinguish the fire in the junction box 1.

[0032] Example 2, as Figure 6 As shown, the back and interior of the junction box 1 are provided with an adjustment mechanism for adjusting the angle of the nozzle 65. The adjustment mechanism includes a cover 71, which is fixedly installed on the upper part of the back of the junction box 1. A rotating shaft 72 is rotatably connected inside the cover 71, and the front end of the rotating shaft 72 extends into the interior of the junction box 1. A lever 73 is fixedly installed on the front of the rotating shaft 72, and the lower end of the lever 73 is connected to the connecting pipe 64. A gear 74 is fixedly installed on the outer side of the back of the rotating shaft 72. A second servo motor 75 is fixedly installed on the right side of the cover 71. A lead screw 76 is fixedly installed at the output end of the second servo motor 75. A rack 77 that meshes with the gear 74 is slidably connected to the inner wall of the cover 71. A protrusion 78 is fixedly installed on the top of the rack 77.

[0033] The protrusion 78 is threaded onto the outside of the lead screw 76 and is used to drive the rack 77 to move linearly left and right. The servo motor 75 is electrically connected to the controller and is used to control the start and stop of the servo motor 75.

[0034] Working principle: When a fire breaks out inside junction box 1, the temperature inside junction box 1 rises, causing the liquid in pipe 47 to expand. As the liquid expands, it overcomes the elastic force of spring 48 and pushes the two electrode plates 49 closer together. When the two electrode plates 49 contact each other, the external controller is activated, thereby controlling the electric push rod 43 and servo motor 52 to start. The electric push rod 43 pushes the mounting plate 44 down, and at the same time, the push rod 45 drives the two gate plates 42 to move linearly along the rectangular rail 41, sealing the ventilation slot at the top of junction box 1. The servo motor 52 drives the threaded rod 53 to rotate. When the threaded rod 53 rotates, it connects with the two moving plates 55, thereby separating the two moving plates 55 from each other. The push plate 56 drives junction box 1 down, so that the heat dissipation slot on the side of junction box 1 is completely inserted into the base 51, sealing the heat dissipation slot and preventing combustion-supporting gases from entering junction box 1 through the ventilation slot and heat dissipation slot. By isolating the air, the fire extinguishing of junction box 1 is accelerated.

[0035] Subsequently, the controller controls the opening of valve 63, allowing the dry powder in tank 61 to be sprayed out through connecting pipe 64 from nozzle 65 to extinguish the fire in junction box 1. Simultaneously, the controller starts servo motor 75, causing servo motor 75 to drive lead screw 76 to rotate and connect with protrusion 78. Protrusion 78 drives rack 77 to move linearly back and forth. In conjunction with the meshing of rack 77 and gear 74, gear 74 drives shaft 72 and lever 73 to swing left and right. When lever 73 swings, it drives nozzle 65 to swing, thus causing nozzle 65 to spray dry powder in an oscillating manner, increasing the dry powder coverage area and accelerating the fire extinguishing in junction box 1. After nozzle 65 rotates to a suitable angle, servo motor 75 can be turned off, allowing nozzle 65 to stop at the required angle for targeted powder spraying, thereby accelerating the fire extinguishing efficiency.

[0036] 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 illustrative of the principles of 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 this invention is defined by the appended claims and their equivalents.

Claims

1. A junction box for power engineering construction, comprising a junction box (1), wherein a ventilation slot is provided on the top of the junction box (1), an exhaust fan (2) is installed inside the ventilation slot, and a mesh cover (3) is installed on the upper end of the ventilation slot, characterized in that: The junction box (1) is provided with a sealing mechanism for isolating external air at the upper end. The sealing mechanism includes a rectangular rail (41), which is fixedly installed at the upper end of the junction box (1). The rectangular rail (41) is slidably connected to the left and right sides of the rectangular rail (41), and an electric push rod (43) is fixedly installed at the middle of the top of the junction box (1). An installation plate (44) is fixedly installed at the bottom of the electric push rod (43). Push rods (45) are rotatably connected to the left and right ends of the top of the installation plate (44). The upper ends of the two push rods (45) are rotatably connected to the lower ends of the two gates (42) respectively. When the junction box (1) catches fire, the electric push rod (43) pushes the mounting plate (44) down, and the two push rods (45) pull the two gates (42) to seal the ventilation slot.

2. A junction box for power engineering construction according to claim 1, characterized in that: The sealing mechanism also includes a housing (46), which is fixedly installed inside the top of the junction box (1). A pipe (47) is connected to the outside of the housing (46). The pipe (47) is U-shaped and its two ends are connected to the left and right sides of the housing (46). Springs (48) are fixedly installed on the left and right sides of the inner wall of the housing (46). Electrode plates (49) are installed on the free ends of the two springs (48). A sealing ring (410) is fixedly installed on the outside of the electrode plate (49). The sealing ring (410) abuts against the inner wall of the housing (46).

3. A junction box for power engineering construction according to claim 2, characterized in that: The pipe (47) is filled with a liquid that expands when heated, and the electric push rod (43) is connected to an external controller.

4. A junction box for power engineering construction according to claim 2, characterized in that: The sealing mechanism also includes a base (51), which is installed on the lower outer side of the junction box (1). A servo motor (52) is fixedly installed on the right side of the base (51). A threaded rod (53) is fixedly installed at the output end of the servo motor (52). A guide rod (54) is fixedly installed on the inner wall of the base (51) on the back of the threaded rod (53). A movable plate (55) is symmetrically installed on the left and right sides of the threaded rod (53) and the guide rod (54). A push plate (56) is rotatably connected to the top of the movable plate (55). The upper end of the push plate (56) is rotatably connected to the bottom of the junction box (1) to push the junction box (1) to move up and down.

5. A junction box for power engineering construction according to claim 4, characterized in that: The junction box (1) has evenly distributed heat dissipation grooves on the lower outer side, the threaded rod (53) has external threads in opposite directions on the left and right sides, the moving plate (55) is threaded to the outside of the threaded rod (53), and the servo motor (52) is electrically connected to the controller.

6. A junction box for power engineering construction according to claim 1, characterized in that: The junction box (1) is equipped with a fire extinguishing mechanism inside and on the back. The fire extinguishing mechanism includes a tank (61). The tank (61) is installed on the back of the junction box (1). A fastening sleeve (62) is installed on the back of the junction box (1) by screws to fix the tank (61) to the back of the junction box (1). A valve (63) is installed on the top of the tank (61). A connecting pipe (64) is connected to the top of the valve (63). A nozzle (65) is installed at the end of the connecting pipe (64) away from the valve (63).

7. A junction box for power engineering construction according to claim 6, characterized in that: The valve (63) is a solenoid valve and is electrically connected to the controller.

8. A junction box for power engineering construction according to claim 6, characterized in that: The junction box (1) is provided with an adjustment mechanism for adjusting the angle of the nozzle (65) on the back and inside. The adjustment mechanism includes a cover (71), which is fixedly installed on the upper back of the junction box (1). A rotating shaft (72) is rotatably connected inside the cover (71), and the front end of the rotating shaft (72) extends into the junction box (1). A lever (73) is fixedly installed on the front of the rotating shaft (72), and the lower end of the lever (73) is connected to the connecting pipe (64). A gear (74) is fixedly installed on the outer side of the back of the rotating shaft (72). A servo motor (75) is fixedly installed on the right side of the cover (71). A lead screw (76) is fixedly installed at the output end of the servo motor (75). A rack (77) that meshes with the gear (74) is slidably connected to the inner wall of the cover (71), and a protrusion (78) is fixedly installed on the top of the rack (77).

9. A junction box for power engineering construction according to claim 8, characterized in that: The protrusion (78) is threaded to the outside of the lead screw (76) and is used to drive the rack (77) to move linearly left and right. The second servo motor (75) is electrically connected to the controller and is used to control the start and stop of the second servo motor (75).

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