Convenient-to-maintain low-voltage electric energy metering box for electric power

Abstract

The invention relates to the technical field of metering boxes, in particular to an electric power low-voltage electric energy metering box convenient to maintain, which comprises a metering box, a box door, an electrical component mounting rack and a moving frame, a cylinder is arranged on the moving frame, an air inducing channel is formed in the cylinder, and a filter screen is arranged on the cylinder. According to the electric power low-voltage electric energy metering box convenient to maintain, negative pressure is formed in the inner cavity of the metering box through the exhaust fan, external gas is actively guided to flow in, the gas is gradually compressed in the flowing process through the structure of the air inducing channel which is narrow in the left and wide in the right, and the gas flow has a certain speed to impact the surface of an electric appliance element through the gas outlet end; conductive heat on the surface of an electrical component can be rapidly taken away, and local heat accumulation is avoided.

Description

Technical Field

[0001] This invention relates to the field of metering box technology, and specifically to a low-voltage power metering box for electricity that is easy to maintain. Background Technology

[0002] A metering box is a collection of metering instruments and auxiliary equipment necessary for measuring electrical energy, including electricity meters, voltage and current transformers and their secondary circuits, electricity metering panels, cabinets, and boxes. Metering boxes can be installed in a suspended or floor-mounted manner. To ensure installation quality, suspended boxes must be secured with built-in expansion bolts, and the bolt dimensions must meet safety and security requirements, as well as outdoor installation conditions.

[0003] Visually inspect the exterior of the electricity metering box for any damage, corrosion, deformation, or other abnormalities. Open the metering box and inspect the internal components, including the electricity meter, terminals, and junction boxes, for any burning, loosening, or damage. Replace or repair any damaged parts to ensure all components are functioning properly. Perform an insulation resistance test on the electricity metering box to ensure there is no risk of leakage. After completing the maintenance, reconnect the power and observe whether the electricity meter is working properly and check for any abnormalities. Record the maintenance process and results, and write a maintenance report to provide a reference for future maintenance.

[0004] In order to dissipate heat from the internal electrical components, existing metering boxes have ventilation openings on the side walls and exhaust fans on the top. The exhaust fans can draw out the gas inside the metering box, creating a negative pressure state inside the metering box. Outside gas flows into the metering box through the ventilation openings. However, since the ventilation openings are fixed in position, when outside gas enters the metering box through the ventilation openings, it is easy to bring dirt from the air into the surface of the electrical components. When dirt adheres to the surface of the electrical components, it reduces the heat dissipation of the electrical components.

[0005] Therefore, the present invention provides a low-voltage power metering box for easy maintenance to solve the above problems. Summary of the Invention

[0006] In view of the above situation and to overcome the defects of the prior art, the present invention provides a low-voltage power metering box that is easy to maintain, so as to solve the problem that when external gas enters the metering box through the ventilation port, it is easy to bring dirt in the air into the surface of electrical components. When dirt adheres to the surface of electrical components, it will reduce the heat dissipation of electrical components.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A low-voltage power metering box for easy maintenance includes a metering box and a door hinged to the metering box, wherein an electrical component mounting bracket for mounting electrical components is installed inside the metering box. A blower assembly is located inside the metering box. The blower assembly includes a movable frame mounted on the metering box. A groove is provided on the side wall of the metering box to accommodate the movable frame, and the movable frame is located inside the groove and can slide up and down. Multiple axially rotatable cylinders are spaced apart on the movable frame, and the multiple cylinders are vertically arranged on the surface of the movable frame. Air ducts are provided on the cylinders, and external gas can flow into the interior of the metering box through the air ducts and be blown onto the surface of the electrical components. A removable filter screen is installed on the cylinder to filter the gas entering the air duct.

[0008] Preferably, the surface of the movable frame is provided with a plurality of annular grooves adapted to the cylinder, and the annular grooves are connected to the inner cavity of the movable frame. The cylinder is rotatably connected inside the corresponding annular groove. The annular groove is used to provide rotation space for the cylinder. A sealing gasket is installed at the groove opening of the annular groove, and the sealing gasket is in contact with the outer ring surface of the cylinder to seal the annular groove.

[0009] Preferably, the movable frame is provided with a driving assembly, which includes a first driving component and a second driving component. The first driving component includes a side lifting plate fixed to the side wall of the movable frame, and the side of the side lifting plate away from the movable frame is slidably connected to the inner wall of the metering box groove for supporting the movable frame. A driving shaft is connected to the lifting plate, and a driving source is installed on the top of the metering box. The output end of the driving source is connected to the top of the driving shaft.

[0010] Preferably, the second driving component includes a rotating shaft rotatably connected to both sides of the cylinder, and the rotating shaft is coaxially arranged with the cylinder. The outer wall of the moving frame is provided with a limiting hole adapted to the rotating shaft. The rotating shaft is connected to the inner cavity of the moving frame. The outer wall of the rotating shaft is rotatably connected to the inner wall of the corresponding limiting hole. The limiting hole is used to support the rotating shaft. The moving frame is provided with a transmission component to drive the rotating shaft to rotate in order to adjust the angle of the cylinder.

[0011] Preferably, the transmission component includes an external gear ring mounted on a rotating shaft, with racks fixed to the inner walls of both sides of the groove, and the external gear ring meshing with the corresponding racks. The external gear ring, in conjunction with the racks, can drive the drive shaft to rotate to adjust the angle of the air blowing through the air duct.

[0012] Preferably, the moving frame is provided with a backflush assembly, which includes a suction component and a sealing component. The suction component includes a suction head installed on the inner wall of the metering box. A connecting box is fixed on the inner wall of the groove of the metering box, and one end of the suction head passes through the metering box and is fixedly connected to the connecting box. The gas inside the metering box can flow into the interior of the connecting box through the suction head. The connecting box has a gas-containing cavity. The top end of the moving frame is slidably connected to the interior of the gas-containing cavity. The outer wall of the top end of the moving frame is attached to the inner wall surface of the gas-containing cavity, and the gas inside the connecting box can enter the interior of the moving frame.

[0013] Preferably, the inner wall of the movable frame is fixed with a filter screen plate, and multiple filter screen plates are vertically arranged inside the movable frame. Microscopic dirt attached to the surface of the filter screen can fall onto the surface of the filter screen plate. The movable frame has multiple second openings arranged at equal intervals, and the bottom end of the filter screen plate corresponds to the second opening. Dirt on the surface of the filter screen plate can be discharged through the second opening.

[0014] Preferably, the sealing element includes a sealing plate installed on the surface of the movable frame, and the sealing plate corresponds to the second opening. The sealing plate is used to control the opening and closing state of the second opening. A limit post is installed on the side wall of the metering box. A sliding hole adapted to the limit post is opened on the sealing plate, and the limit post is slidably connected inside the corresponding sliding hole.

[0015] Preferably, the inner walls on both sides of the groove are fixed with limiting plates, and the limiting plates are provided with positioning holes adapted to the drive shaft. The outer wall of the drive shaft is rotatably connected to the inner wall of the positioning hole, and the positioning hole is used to limit the drive shaft.

[0016] Preferably, a return spring is fixed between the sealing plate and the stepped surface of the limiting post.

[0017] The beneficial effects of this invention are as follows: 1. The exhaust fan creates negative pressure inside the metering box, actively guiding external gas in. The "narrow on the left and wide on the right" structure of the air duct allows the gas to be gradually compressed during flow. The air outlet allows the airflow to impact the surface of the electrical components at a certain speed, which can quickly remove the conductive heat from the surface of the electrical components and avoid local heat accumulation.

[0018] 2. The moving frame drives the cylinder to move vertically, and the airflow from the outlet can contact the entire surface of the electrical components; at the same time, the external gear ring meshes with the rack and pinion, causing the cylinder to rotate and switch the airflow from horizontal to oblique blowing, which can blow towards the bottom surface of the protruding parts of the electrical components, the wiring terminals and other traditional heat dissipation blind areas, thereby uniformly cooling the electrical components.

[0019] 3. When the moving frame moves downward, the connecting box forms a negative pressure to draw hot air from the top of the metering box. When the air duct is connected to the inner cavity of the moving frame, the high-pressure gas impacts the surface of the filter screen in the opposite direction, blowing away the dirt attached to the surface of the filter screen without the need for manual disassembly and cleaning. The dirt on the surface of the filter screen will slide to the bottom due to its tilt and the airflow. With the opening and closing of the sealing plate and the vibration of the return spring when the moving frame moves upward, the dirt will be automatically discharged through the second opening. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the blower assembly of the present invention; Figure 3 This is a schematic diagram of the structure of the movable frame of the present invention; Figure 4 This is a schematic diagram of the structure of the driving component of the present invention; Figure 5 This is a schematic diagram of the structure of the first driving component of the present invention; Figure 6 This is a schematic diagram of the backflush assembly of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A; Figure 8 This is a schematic diagram of the first three-dimensional cross-section of the movable frame of the present invention.

[0021] In the picture: 10. Metering box; 11. Box door; 13. Electrical component mounting rack; 20. Blower assembly; 21. Moving frame; 22. Cylinder; 2201. Air duct; 23. Annular groove; 24. Sealing gasket; 25. Filter screen; 30. Driver components; 31. First driving component; 3101. Side lifting plate; 3102. Drive shaft; 3103. Drive source; 3104. Limiting plate; 32. Second driving component; 3201. Rotating shaft; 3202. Limiting hole; 3203. External gear ring; 3204. Rack; 40. Backflush assembly; 41. Suction component; 4101. Suction head; 4102. Connecting box; 4103. Second opening; 4104. Filter plate; 42. Sealing element; 4202. Sealing plate; 4203. Limiting post; 4204. Sliding hole; 4205. Return spring; 4206. Linkage block; 4207. Pushing block. Detailed Implementation

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] As attached Figures 1-8 As shown, a low-voltage electricity metering box for easy maintenance includes a metering box 10. The metering box 10 has an inner cavity, and electrical components can be installed inside the inner cavity of the metering box 10. The metering box 10 has a door 11 hinged to its opening, which is used to control the opening and closing state of the inner cavity. An electrical component mounting bracket 13 is installed inside the inner cavity, and the electrical components can be installed on the electrical component mounting bracket 13 for use.

[0024] The metering box 10 is equipped with a blower assembly 20, which can draw external air to blow onto the surface of the electrical components, remove the heat generated on the surface of the electrical components when they are working, and thus cool down the electrical components.

[0025] The blower assembly 20 includes a movable frame 21 that can slide up and down inside the metering box 10. A groove adapted to the movable frame 21 is provided on one side wall of the metering box 10, and the movable frame 21 is slidably connected inside the corresponding groove. The groove provides space for the movable frame 21 to slide up and down. A through-hole first opening is provided on the side wall of the movable frame 21. The first opening is connected to the groove, and the inner cavity of the metering box 10 can be connected to the outside through the first opening. The movable frame 21 is located inside the first opening, and the movable frame 21 keeps the first opening in a blocked state, which can prevent external gas from flowing into the metering box 10 through the first opening.

[0026] Multiple cylinders 22 are arranged at equal intervals on the movable frame 21. The cylinders 22 are arranged along the vertical direction of the movable frame 21, and the axis of the cylinders 22 is parallel to the ground. The cylinders 22 are provided with air ducts 2201, and the outside air can flow into the interior of the metering box 10 through the air ducts 2201, so that the air flowing into the metering box 10 blows onto the surface of the electrical components to dissipate heat. At the same time, when the air blows onto the surface of the electrical components, it can blow away dirt or dust attached to the surface of the electrical components.

[0027] It should be noted that the air duct 2201 is trapezoidal in shape and is narrower on the left and wider on the right. The narrower end of the air duct 2201 is located inside the metering box 10, and the wider end is located outside the metering box 10. Therefore, the wider end of the air duct 2201 is the air inlet, and the narrower end is the air outlet. External air will enter the interior of the air duct 2201 through the air inlet and then be blown onto the surface of the electrical components inside the metering box 10 through the air outlet. When the air flows from the air inlet to the air outlet of the air duct 2201, the cross-sectional area of ​​the air duct 2201 gradually decreases from the air inlet to the air outlet, so that the air ejected through the air outlet has a certain speed and impact force as it flows toward the surface of the electrical components.

[0028] The surface of the movable frame 21 is provided with a plurality of annular grooves 23 that are adapted to the cylinder 22, and the annular grooves 23 are connected to the inner cavity of the movable frame 21. The annular grooves 23 correspond one-to-one with the cylinders 22, and the cylinders 22 are rotatably connected to the interior of the corresponding annular grooves 23. The annular grooves 23 provide rotation space for the cylinders 22. A sealing gasket 24 is installed at the opening of the annular groove 23, and the sealing gasket 24 is in contact with the outer ring surface of the cylinder 22 to seal the annular groove 23, thereby preventing external gas from flowing into the interior of the metering box 10 through the annular grooves 23.

[0029] A filter screen 25 is installed at the air inlet end of the cylinder 22. The filter screen 25 is arc-shaped and can filter the air flowing from the outside to the air duct 2201, thereby preventing dirt from the outside from flowing into the metering box 10.

[0030] It should be noted that ear plates are provided on both sides of the filter screen 25. The outer ring surface of the cylinder 22 is provided with mounting grooves that are compatible with the ear plates. The ear plates can be snapped into the corresponding mounting grooves to fix the ear plates. Positioning elements are threaded on the ear plates. In this embodiment, the positioning elements are bolts. The outer ring surface of the cylinder 22 is provided with threaded grooves that are compatible with the bolts. The threaded grooves are connected to the mounting grooves, and the bolts are threadedly connected to the threaded grooves, which facilitates the assembly and disassembly of the filter screen 25.

[0031] Since the metering box 10 is equipped with an exhaust fan, the exhaust fan can be any type available on the market. The exhaust fan is connected to a control system that can control the opening and closing of the exhaust fan. The staff first installs the electrical components on the electrical component mounting bracket 13. The installation method is adjusted according to actual needs. After the electrical components are installed, the staff turns on the exhaust fan through the control system. The exhaust fan draws in the gas inside the metering box 10 and discharges it to the outside. The inside of the metering box 10 is under negative pressure due to the suction of the exhaust fan, while the outside gas can flow into the inside of the metering box 10 through the air duct 2201 on the cylinder 22.

[0032] As external gas flows into the air intake duct 2201, the filter screen 25 filters the gas. The gas filtered by the filter screen 25 first passes through the air intake end of the air intake duct 2201, flows to the air outlet end and is discharged. As the cross-sectional area decreases from the air intake end to the air outlet end, the gas is compressed, thus creating pressure. At this time, the gas has a certain speed and impact. Since the cylinder 22 is located on the side of the electrical component mounting bracket 13, that is, the air outlet end of the air intake duct 2201 corresponds to the surface of the electrical component, when the gas compressed by the cross-sectional area is discharged through the air outlet end of the air intake duct 2201, it can blow onto the surface of the electrical component, thereby carrying away the heat generated on the surface of the electrical component to complete the cooling of the electrical component. The gas discharged through the air outlet end can also impact the surface of the electrical component to a certain extent, blowing off the dust or micro-dirt attached to the surface of the electrical component.

[0033] The movable frame 21 is provided with a drive assembly 30, which is used to drive the movable frame 21 to slide up and down inside the groove of the metering box 10 to adjust the position of the cylinder 22 so that the gas discharged through the air outlet of the air duct 2201 can be blown to different positions of the electrical components.

[0034] The drive assembly 30 includes a first drive member 31 and a second drive member 32. The first drive member 31 is used to drive the moving frame 21 to slide up and down inside the groove of the metering box 10, thereby adjusting the position of the cylinder 22 so that the gas inside the air duct 2201 can be blown to different positions of the electrical components. The second drive member 32 is used to adjust the angle of the cylinder 22 so that the exhaust angle of the air duct 2201 can make the gas blow obliquely to the bottom surface of the protrusion of the electrical components.

[0035] The first driving component 31 is fixed to the side lifting plate 3101 on the side wall of the moving frame 21, and the side of the side lifting plate 3101 away from the moving frame 21 is slidably connected to the inner wall of the groove of the metering box 10 to support the moving frame 21, thereby maintaining the stability of the moving frame 21 when it slides up and down.

[0036] It should be noted that both sides of the movable frame 21 have side lifting plates 3101. Multiple side lifting plates 3101 arranged vertically on one side of the movable frame 21 form a group, that is, each side of the movable frame 21 has a group of side lifting plates 3101.

[0037] Each set of side lifting plates 3101 is connected to the same drive shaft 3102, and the top and bottom of the same drive shaft 3102 are respectively rotatably connected to the inner top wall and inner bottom wall of the groove, and the axis of the drive shaft 3102 is perpendicular to the axis of the cylinder 22.

[0038] The drive shaft 3102 has multiple threaded ends, and each threaded end corresponds to a side lifting plate 3101. The side lifting plate 3101 has a threaded groove that matches the threaded ends, and the side lifting plate 3101 is threadedly connected to the threaded end of the drive shaft 3102 through the threaded groove. When the drive shaft 3102 rotates axially, the drive shaft 3102 can drive the side lifting plate 3101 to slide up and down along the axis of the drive shaft 3102 through the cooperation of the threaded end and the threaded groove on the side lifting plate 3101, thereby driving the moving frame 21 to slide up and down inside the groove.

[0039] Several drive sources 3103 are installed on the top of the metering box 10, with each pair of drive sources 3103 forming a group, and each group of drive sources 3103 corresponding to a moving frame 21. The drive sources 3103 correspond one-to-one with the drive shaft 3102, and the output end of the drive source 3103 is connected to the top of the drive shaft 3102. All drive sources 3103 are connected to the control system, so the control system can control the opening and closing state of the drive sources 3103, and the control system can control two drive sources 3103 to rotate synchronously. When the output end of the drive source 3103 drives the drive shaft 3102 to rotate, the drive shaft 3102 drives the moving frame 21 to move downward inside the groove through the limit plate 3104, so that the gas is blown to different positions of the electrical components through the air duct 2201.

[0040] Limiting plates 3104 are fixed on both sides of the inner wall of the groove. The limiting plates 3104 are provided with positioning holes that are compatible with the drive shaft 3102. The outer wall of the drive shaft 3102 is rotatably connected to the inner wall of the positioning hole. The positioning hole is used to limit the drive shaft 3102, thereby maintaining the stability of the drive shaft 3102 when it rotates.

[0041] The second driving component 32 includes a rotating shaft 3201 rotatably connected to both sides of the cylinder 22, and the rotating shaft 3201 is coaxially arranged with the cylinder 22. The outer wall of the moving frame 21 is provided with a limiting hole 3202 adapted to the rotating shaft 3201, and the limiting hole 3202 corresponds one-to-one with the rotating shaft 3201. The rotating shaft 3201 is connected to the inner cavity of the moving frame 21, and the outer wall of the rotating shaft 3201 is rotatably connected to the inner wall of the corresponding limiting hole 3202 to support the rotating shaft 3201, thereby maintaining the stability of the rotating shaft 3201 when rotating. When the moving frame 21 moves downward, the rotating shaft 3201 rotates inside the limiting hole 3202, and the rotating shaft 3201 drives the connected cylinder 22 to rotate, which can change the air duct 2201 from horizontal blowing to oblique blowing.

[0042] An external gear ring 3203 is installed on the outer wall of one end of the rotating shaft 3201 that extends out of the limiting hole 3202. A rack 3204 is fixed on both sides of the inner wall of the groove, and the rack 3204 corresponds to the drive shaft 3102 one by one. The external gear ring 3203 meshes with the corresponding rack 3204. When the moving frame 21 moves down, the external gear ring 3203 and the rack 3204 can drive the drive shaft 3102 to rotate around the axis, thereby adjusting the air blowing angle of the air duct 2201.

[0043] The operator activates the drive source 3103 via the control system. The control system controls several drive sources 3103 to rotate synchronously. The output end of the drive source 3103 drives the connected drive shaft 3102 to rotate around its axial direction. The threaded section on the drive shaft 3102 drives the limiting plate 3104 to move downwards. The limiting plate 3104, in turn, drives the moving frame 21 to move downwards inside the metering box 10. The external gear ring 3203, through meshing with the rack 3204, drives the cylinder 22 to rotate. The cylinder 22 then rotates around its axial direction inside the annular groove 23. At this time, the rotation direction of the cylinder 22 is from that of the metering box 10. The air duct 2201 rotates from the inside to the outside, at which point the air inlet end of the air duct 2201 rotates from the horizontal direction to the bottom of the cylinder 22, and the air outlet end of the air duct 2201 rotates from the horizontal direction to the top of the cylinder 22. Thus, the air duct 2201 changes from horizontal blowing to oblique blowing, and the air outlet end of the air duct 2201 faces the inner top of the metering box 10. This allows the air inside the air duct 2201 to blow towards the bottom surface of the protrusion of the electrical component, preventing dirt from adhering to the bottom surface of the protrusion of the electrical component. At the same time, the oblique blowing direction of the air duct 2201 can drive the heat on the surface of the electrical component to flow towards the inner top of the metering box 10, so that the gas containing heat inside the metering box 10 can be discharged more quickly.

[0044] The movable frame 21 is equipped with a backflush assembly 40, which can extract the gas at the top of the metering box 10 to accelerate the discharge of heat from the top of the metering box 10. At the same time, the extracted gas can remove dirt adhering to the surface of the filter screen 25.

[0045] The backflush assembly 40 includes a suction component 41 and a sealing component 42. The suction component 41 can extract the gas at the top of the metering box 10 to accelerate the discharge of the hot gas at the top of the metering box 10. At the same time, the extracted gas is used to clean the surface of the filter screen 25 by rushing into the air duct 2201. The sealing component 42 can seal the inside of the moving frame 21 to prevent other external components from entering the inside of the moving frame 21.

[0046] The suction component 41 includes a suction head assembly installed on the inner top wall of the metering box 10. The suction head assembly includes multiple suction heads 4101 installed on the inner wall of the metering box 10. Each suction head 4101 has a one-way valve inside, meaning that the suction head 4101 can only suck in air and cannot expel air. A connecting box 4102 is fixed on the inner wall of the groove of the metering box 10. Each connecting box 4102 corresponds to one suction head assembly. One end of the suction head 4101 passes through the metering box 10 and is fixedly connected to the connecting box 4102. The gas inside the metering box 10 can flow into the interior of the connecting box 4102 through the suction head 4101. The connecting box 4102 has a gas-containing cavity. The top end of the moving frame 21 is slidably connected to the interior of the gas-containing cavity. The outer wall of the top end of the moving frame 21 is attached to the inner wall of the gas-containing cavity. The gas inside the connecting box 4102 can enter the interior of the moving frame 21.

[0047] It should be noted that when the cylinder 22 is in the initial position, the outer ring surface of the cylinder 22, together with the sealing gasket 24, seals the inside of the moving frame 21. The gas at the top of the moving frame 21 is blocked by the cylinder 22 located above it and cannot flow into the bottom of the moving frame 21. When the moving frame 21 moves down, the top of the moving frame 21 moves down inside the connecting box 4102. At this time, the inside of the connecting box 4102 is under negative pressure, and the gas inside the metering box 10 can flow into the inside of the connecting box 4102 through the suction head 4101.

[0048] A filter plate 4104 is fixed to the inner wall of the movable frame 21. The filter plate 4104 is oblique and corresponds to the cylinder 22. Multiple filter plates 4104 are vertically arranged inside the movable frame 21. Micro-dirt attached to the surface of the filter screen 25 can fall onto the surface of the filter plate 4104. Multiple second openings 4103 are provided on the movable frame 21 at equal intervals. The multiple second openings 4103 correspond to the filter plates 4104. The bottom end of the filter plate 4104 corresponds to the second opening 4103. Dirt on the surface of the filter plate 4104 can be discharged through the second opening 4103.

[0049] The sealing element 42 includes a sealing plate 4202 installed on the surface of the movable frame 21, and the sealing plate 4202 corresponds to the second opening 4103. The sealing plate 4202 is used to control the opening and closing state of the second opening 4103. A limit post 4203 is installed on the side wall of the metering box 10. A sliding hole 4204 adapted to the limit post 4203 is opened on the sealing plate 4202, and the limit post 4203 is slidably connected inside the corresponding sliding hole 4204. A return spring 4205 is fixed between the stepped surfaces of the sealing plate 4202 and the limit post 4203.

[0050] As the moving frame 21 moves downward inside the metering box 10, its top also moves downward inside the connecting box 4102. The outer ring of the rotating cylinder 22 continuously seals the inside of the moving frame 21, and the inside of the connecting box 4102 is also under negative pressure. The gas inside the metering box 10 enters the connecting box 4102 through the suction head 4101. Since the suction head 4101 is a one-way valve, the gas entering the connecting box 4102 can remain inside it. As the cylinder 2 continues to rotate, the air duct 2201 is connected to the inner cavity of the moving frame 21, and the outside gas cannot flow into the metering box 10 through the cylinder 22. The gas inside the connecting box 4102 flows into the lower end of the moving frame 21 through the air duct 2201. The gas impacts the filter screen 25 on the cylinder 22, causing the dust attached to the surface of the filter screen 25 to fall onto the surface of the filter plate 4104. Since the filter plate 4104 is inclined, the dirt on the surface of the filter plate 4104 will fall to its bottom.

[0051] As the output end of the drive source 3103 rotates in the reverse direction, the drive shaft 3102 drives the moving frame 21 to move upward through the side lifting plate 3101, while the cylinder 22 rotates to reset. When the arc-shaped surface of the linkage block 4206 contacts the arc-shaped surface of the push block 4207, it will drive the sealing plate 4202 to slide towards the stepped surface of the limiting post 4203. At the same time, the sealing plate 4202 compresses the reset spring 4205, thereby releasing the sealing plate 4202 from the blocking state of the second opening 4103, and the dirt on the surface of the filter plate 4104 can fall out through the second opening 4103. As the moving frame 21 continues to move upward, the linkage block 4206 disengages from the push block 4207, and the return spring 4205, which is in a compressed state, resets. The return spring 4205 then drives the sealing plate 4202 to quickly reset to the surface of the metering box 10, thereby applying vibration to the filter screen plate 4104 so that the dirt on the surface of the filter screen plate 4104 rolls to its bottom end and moves down to be discharged through the second opening 4103. Since a baffle is installed on the outer wall of the metering box 10 by bolts and nuts, when the internal transmission mechanism needs to be repaired, the baffle can be removed.

[0052] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A low-voltage electricity metering box for easy maintenance, characterized in that: Includes a metering box (10) and a door (11) hinged to the metering box (10), the inside of which is installed an electrical component mounting bracket (13) for mounting electrical components. The blowing assembly (20) is located inside the metering box (10). The blowing assembly (20) includes a movable frame (21) on the metering box (10). A groove for accommodating the movable frame (21) is provided on the side wall of the metering box (10). The movable frame (21) is located inside the groove and can slide up and down. Multiple axially rotatable cylinders (22) are spaced apart on the movable frame (21). The multiple cylinders (22) are vertically arranged on the surface of the movable frame (21). An air duct (2201) is provided on the cylinder (22). External gas can flow into the interior of the metering box (10) through the air duct (2201) and blow onto the surface of the electrical components. A removable filter screen (25) is installed on the cylinder (22) for filtering the gas entering the air duct (2201).

2. The easy-to-maintain low-voltage power metering box for electricity according to claim 1, characterized in that, The surface of the movable frame (21) is provided with a plurality of annular grooves (23) that are adapted to the cylinder (22), and the annular grooves (23) are connected to the inner cavity of the movable frame (21). The cylinder (22) is rotatably connected to the inside of the corresponding annular groove (23). The annular groove (23) is used to provide rotation space for the cylinder (22). A sealing gasket (24) is installed at the groove opening of the annular groove (23), and the sealing gasket (24) is in contact with the outer ring surface of the cylinder (22) to seal the annular groove (23).

3. The easy-to-maintain low-voltage power metering box for electricity according to claim 2, characterized in that, The movable frame (21) is provided with a drive assembly (30), which includes a first drive member (31) and a second drive member (32). The first drive member (31) includes a side lifting plate (3101) fixed on the side wall of the movable frame (21), and the side lifting plate (3101) is slidably connected to the inner wall of the groove of the metering box (10) on the side away from the movable frame (21) to support the movable frame (21). A drive shaft (3102) is connected to the lifting plate (3101), and a drive source (3103) is installed on the top of the metering box (10). The output end of the drive source (3103) is connected to the top of the drive shaft (3102).

4. The easy-to-maintain low-voltage power metering box for electricity according to claim 3, characterized in that, The second driving component (32) includes a rotating shaft (3201) rotatably connected to both sides of the cylinder (22), and the rotating shaft (3201) is coaxially arranged with the cylinder (22). The outer wall of the moving frame (21) is provided with a limiting hole (3202) that is adapted to the rotating shaft (3201). The rotating shaft (3201) is connected to the inner cavity of the moving frame (21). The outer wall of the rotating shaft (3201) is rotatably connected to the inner wall of the corresponding limiting hole (3202). The limiting hole (3202) is used to support the rotating shaft (3201). The moving frame (21) is provided with a transmission component to drive the rotating shaft (3201) to rotate in order to adjust the angle of the cylinder (22).

5. The easy-to-maintain low-voltage power metering box for electricity according to claim 4, characterized in that, The transmission component includes an external gear ring (3203) mounted on a rotating shaft (3201). Racks (3204) are fixed on both sides of the inner wall of the groove. The external gear ring (3203) meshes with the corresponding rack (3204). The external gear ring (3203) and the rack (3204) can drive the drive shaft (3102) to rotate to adjust the angle of air blowing in the air duct (2201).

6. The easy-to-maintain low-voltage power metering box for electricity according to claim 2, characterized in that, The moving frame (21) is provided with a back-blowing component (40), which includes a suction component (41) and a sealing component (42). The suction component (41) includes a suction head (4101) installed on the inner wall of the metering box (10). A connecting box (4102) is fixed on the inner wall of the groove of the metering box (10), and one end of the suction head (4101) passes through the metering box (10) and is fixedly connected to the connecting box (4102). The gas inside the metering box (10) can flow into the interior of the connecting box (4102) through the suction head (4101). The connecting box (4102) has a gas-containing cavity. The top end of the moving frame (21) is slidably connected to the interior of the gas-containing cavity. The outer wall of the top end of the moving frame (21) is attached to the inner wall of the gas-containing cavity. The gas inside the connecting box (4102) can enter the interior of the moving frame (21).

7. The easy-to-maintain low-voltage power metering box for electricity according to claim 6, characterized in that, The inner wall of the movable frame (21) is fixed with a filter plate (4104). Multiple filter plates (4104) are arranged vertically inside the movable frame (21). The micro-dirt attached to the surface of the filter screen (25) can fall onto the surface of the filter plate (4104). Multiple second openings (4103) are provided on the movable frame (21) at equal intervals, and the bottom end of the filter plate (4104) corresponds to the second opening (4103). The dirt on the surface of the filter plate (4104) can be discharged through the second opening (4103).

8. The easy-to-maintain low-voltage power metering box for electricity according to claim 6, characterized in that, The sealing element (42) includes a sealing plate (4202) installed on the surface of the movable frame (21), and the sealing plate (4202) corresponds to the second opening (4103). The sealing plate (4202) is used to control the opening and closing state of the second opening (4103). A limit post (4203) is installed on the side wall of the metering box (10). A sliding hole (4204) adapted to the limit post (4203) is opened on the sealing plate (4202), and the limit post (4203) is slidably connected inside the corresponding sliding hole (4204).

9. The easy-to-maintain low-voltage power metering box for electricity according to claim 4, characterized in that, Both sides of the groove are fixed with a limiting plate (3104). The limiting plate (3104) has a positioning hole that matches the drive shaft (3102). The outer wall of the drive shaft (3102) is rotatably connected to the inner wall of the positioning hole. The positioning hole is used to limit the drive shaft (3102).

10. The easy-to-maintain low-voltage power metering box for electricity according to claim 8, characterized in that, A return spring (4205) is fixed between the sealing plate (4202) and the stepped surface of the limiting post (4203).

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