Outdoor electric energy metering box
By using a sealing gasket and elastic sealing strips in the power metering box, as well as setting up heat dissipation components and protective components, the problem of sand and dust entering the power metering box in wind and sand areas is solved, and effective protection of electrical components and accuracy of power metering is achieved.
Patent Information
- Application Number
- CN202411664246.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-03-18
AI Technical Summary
When the electric energy metering box is used in areas with heavy wind and sand, sand and dust may enter the box through the connection between the box and the box door, damaging the internal meter and circuit, affecting the normal supply of electricity and the accuracy of metering.
An outdoor power metering box is designed, which adopts a matching setting of sealing gasket and elastic sealing strips. The elastic sealing strip on the box door is inserted into the sealing ring groove to reduce the possibility of external impurities entering; at the same time, a heat dissipation component and a protective component are installed to realize gas circulation through a heat dissipation fan and a heat dissipation port, and dust entry is reduced through a protective cover.
It effectively reduces the possibility of external impurities and dust entering the box through the box door and box connection, enhances protection of electrical components, and ensures the accuracy of electrical energy measurement and the normal supply of electricity.
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Figure CN119651359A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electric power equipment, and in particular to an outdoor electric energy metering box. Background Art
[0002] The electric energy meter box is the shell for installing the electric energy meter, which is commonly found in residential, commercial buildings, industrial plants and other places. It is not only the carrier for the installation of the electric meter, but also an important device for protecting the electric meter and its surrounding environment.
[0003] In the related technology, the electric energy meter box is mainly composed of a box body and a door. The door is connected to the box body by a hinge, and the other side is connected to the box body by a lock structure to achieve a detachable connection, which is convenient for daily operation and maintenance. At the same time, the door is equipped with an observation window to facilitate intuitive observation of the conditions inside the box. The box body and the door are made of various materials, and metals or non-metals such as resin-based composite materials, polycarbonate (PC) and ABS engineering plastics are common choices. As the core component of the electric energy meter box, the electric energy meter is firmly installed on the inner wall of the box by screws, accurately measuring and monitoring power consumption, and providing important data support for power management.
[0004] However, when the power meter box is used in areas with strong winds and sand, such as the northwest, its operating environment faces severe challenges. Dust particles may not only continuously erode the surface of the power meter box, causing the coating to wear or the metal parts to rust, but long-term dust erosion may also damage the sealing performance of the power meter box (entering through the connection between the box body and the door). Once the seal fails, dust may enter the box, directly damaging the internal meter and circuit, and even affecting the normal supply of electricity and the accuracy of metering. There is room for improvement. Summary of the invention
[0005] The purpose of this application is to provide an outdoor electricity meter box to solve the problem that when the above-mentioned electricity meter box is used in an area with strong winds and sand, sand and dust may enter the box through the connection between the box body and the box door, causing damage to the internal electricity meter and circuit.
[0006] The outdoor electric energy meter box provided in this application adopts the following technical solution: An outdoor electric energy meter box comprises a box body and a box door arranged on the box body, one side of the box door is rotatably connected to the box body, and the other side of the box door is detachably connected to the box body; an elastic sealing strip is arranged on the side of the box door facing the box body, a sealing gasket is wound around the side of the box body facing the box door, and a sealing ring groove is opened on the sealing gasket for the elastic sealing strip to be inserted.
[0007] By adopting the above technical solution, when the box door is in a closed state, due to the coordinated arrangement of the sealing gasket and the elastic sealing strip, the elastic sealing strip on the box door is inserted into the sealing ring groove, thereby reducing the possibility of external impurities entering the interior of the box through the connection gap between the box door and the box body, thereby strengthening the protection of electrical components installed inside the box body.
[0008] Optionally, a heat dissipation component is provided on the side of the box, and the heat dissipation component includes a heat dissipation fan arranged on the side wall of the box, a control button for controlling the opening and closing of the heat dissipation fan, and a plurality of heat dissipation ports are opened on the side wall of the box away from the heat dissipation fan; a protective component for protecting the heat dissipation port and the heat dissipation fan is provided on the outer side of the box, and the protective component includes a protective cover arranged on the outer side of the heat dissipation port and the heat dissipation fan, and the protective cover is provided with a downward opening.
[0009] By adopting the above technical scheme, due to the coordinated setting of the heat dissipation component and the protective component, during the application of the electric energy meter box, the heat dissipation fan and the heat dissipation port can be used to form the circulation of gas inside and outside the box, and the external gas enters from the heat dissipation port and is discharged through the heat dissipation fan; at the same time, the protective cover can also be used to protect the heat dissipation port and the heat dissipation fan, reducing the possibility of external dust or impurities entering the inside of the box door through the heat dissipation port and the heat dissipation fan.
[0010] Optionally, a trigger rod is provided on the side of the box door facing the box body, and a fixing plate for fixing a control button is provided on the inner wall of the box body. The trigger rod on the box door can abut against the control button when the box door is closed.
[0011] By adopting the above technical solution, due to the installation arrangement of the trigger rod and the fixed plate, when the box door is in a closed state, the trigger rod on the box door can abut against the control button on the fixed plate and control the cooling fan to start; when the box door is opened, the trigger rod releases the pressure on the control button and the cooling fan is turned off.
[0012] Optionally, an elastic pad is provided on the side of the trigger rod away from the box door.
[0013] By adopting the above technical solution, due to the installation setting of the elastic pad on the trigger rod, when the trigger rod squeezes the control button, the elastic pad is used to prevent the trigger rod from directly colliding with the control button, thereby reducing the possibility of damage to the control button due to direct collision of the trigger rod, thereby extending the service life of the control button.
[0014] Optionally, the protection assembly further includes a first barrier net arranged at the lower opening of the protection cover.
[0015] By adopting the above technical solution, due to the coordinated setting of the first barrier net, the possibility of external dust or impurities entering the interior of the box through the lower opening of the protective cover is reduced, thereby enhancing the protection performance of the electric energy meter box and improving the protection of electrical components installed inside the box.
[0016] Optionally, the protective assembly includes a barrier cover arranged outside the protective cover, and a second barrier net is arranged on the side of the barrier cover; a plurality of positioning blocks are arranged on the side edge of the barrier cover facing the box body, and a first positioning slot for the positioning blocks to be embedded is opened on the outer surface of the box body.
[0017] By adopting the above technical scheme, due to the coordinated arrangement of the barrier cover and the second barrier net, external protection of the heat dissipation fan and the heat dissipation port can be provided, and the positioning block on the upper part of the barrier cover is inserted into the first positioning slot on the upper part of the box body, and the positioning block on the lower part of the barrier cover is inserted into the first positioning slot on the lower part of the box body, thereby realizing double barrier protection for the heat dissipation port and the heat dissipation fan, enhancing the protection performance of the electric energy metering box, and further improving the protection of the electrical components installed inside the box body.
[0018] Optionally, a shock absorbing assembly is provided on the side of the box body, and the shock absorbing assembly includes a shock absorbing support plate and a plurality of damping springs arranged on the shock absorbing support plate, the end of the damping spring away from the shock absorbing support plate is connected to the outer side surface of the box body, and the shock absorbing support plate is provided with a plurality of waist-shaped holes.
[0019] By adopting the above technical solution, during the installation and application of the electric energy meter box, the shock-absorbing support plate and the damping spring are used in combination to reduce the impact of external vibration on the electric energy meter box and internal electrical components, thereby improving the buffering and shock-absorbing performance of the electric energy meter box.
[0020] Optionally, one end of the damping spring is fixedly connected to the shock-absorbing support plate, and the other end of the barrier spring is detachably connected to the outer side surface of the box body.
[0021] By adopting the above technical solution, due to the installation arrangement of the damping spring, the time required for the subsequent disassembly and assembly of the damping spring and the electric energy metering box is reduced, and the disassembly and assembly efficiency of the barrier spring is improved.
[0022] Optionally, the barrier cover is an elastic telescopic structure that can be extended and restored along the length direction, the shock-absorbing support plate is provided with a fixing groove for the barrier cover to be embedded, and the side wall of the fixing groove is provided with a second positioning slot for the positioning block to be embedded.
[0023] By adopting the above technical scheme, due to the elastic telescopic setting of the barrier cover, the barrier cover can be used as an elastic support for the shock-absorbing support plate, the positioning block on the upper part of the barrier cover is inserted into the first positioning slot on the upper part of the box body, the lower side of the barrier cover is inserted into the fixed groove on the shock-absorbing support plate, and the positioning block on the lower part of the barrier cover is inserted into the second positioning slot on the shock-absorbing support plate, thereby improving the buffering and shock-absorbing performance of the electric energy meter box during use.
[0024] Optionally, an elastic clip is provided on the positioning block, a first positioning groove for inserting the elastic clip is provided on the side wall of the first positioning slot, and a second positioning groove for inserting the elastic clip is provided on the side wall of the second positioning slot.
[0025] By adopting the above technical solution, due to the matching arrangement of the elastic clip, the first positioning groove and the second positioning groove, when the positioning block is inserted into the first positioning slot and the second positioning slot, the elastic clip on the positioning block is inserted into the corresponding first positioning groove and the second positioning groove, thereby improving the installation stability of the barrier cover.
[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Due to the coordinated setting of the sealing gasket and the elastic sealing strip, when the box door is in the closed state, the elastic sealing strip on the box door is inserted into the sealing ring groove, thereby reducing the possibility of external impurities entering the box through the connection gap between the box door and the box body, and strengthening the protection of the electrical components installed inside the box.
[0027] 2. Due to the coordinated setting of the heat dissipation component and the protective component, the heat dissipation fan and the heat dissipation port can be used to form the circulation of air inside and outside the box, and the external air enters from the heat dissipation port and is discharged through the heat dissipation fan; the heat dissipation port and the heat dissipation fan can also be protected by a protective cover to reduce the possibility of external dust or impurities entering the inside of the box door through the heat dissipation port and the heat dissipation fan. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a cross-sectional structural diagram of the installation and coordination of the box body and the box door in the embodiment of the present application; Figure 3 yes Figure 2 A magnified schematic diagram of part A; Figure 4 It is a partial cross-sectional structural schematic diagram of the embodiment of the present application showing the arrangement and distribution of the heat dissipation ports and the heat dissipation fans; Figure 5 It is a partial cross-sectional structural schematic diagram of the installation and coordination of the heat dissipation fan and the control button in the embodiment of the present application; Figure 6 yes Figure 5 A magnified schematic diagram of part B; Figure 7 yes Figure 5 A magnified schematic diagram of part C; Figure 8 It is a cross-sectional structural diagram of the installation and matching of the shock absorbing assembly in the embodiment of the present application; Fig. 9 It is a schematic diagram of the explosion structure of the barrier cover arrangement distribution in the embodiment of the present application; Fig.10 It is a partial cross-sectional structural schematic diagram of the installation and matching of the barrier cover in the embodiment of the present application; Fig.11 It is a schematic diagram of the partial cross-sectional structure of the barrier cover of the embodiment of the present application when elastically supported.
[0030] In the figure, 1, box body; 11, sealing pad; 111, sealing ring groove; 12, heat dissipation port; 13, fixing plate; 14, first positioning slot; 141, first positioning groove; 2, box door; 21, observation window; 22, elastic sealing strip; 23, trigger rod; 231, elastic pad; 3, heat dissipation component; 31, heat dissipation fan; 32, control button; 4, protection component; 41, protection cover; 42, first barrier net; 43, barrier cover; 431, Positioning block; 4311, placement slot; 432, fixing part; 4321, fixing rod; 433, moving part; 4331, fixing cavity; 434, reset spring; 44, second barrier net; 45, elastic clip; 451, compression spring; 452, arc-shaped protrusion; 5, shock-absorbing assembly; 51, shock-absorbing support plate; 511, waist-shaped hole; 512, fixing slot; 513, second positioning slot; 5131, second positioning groove; 52, damping spring. DETAILED DESCRIPTION
[0031] The present application is further described in detail below in conjunction with all the accompanying drawings.
[0032] Example: Reference Figure 1 An outdoor electric energy meter box comprises a box body 1 and a box door 2 arranged on the box body 1, and a plurality of transparent observation windows 21 are fixedly arranged on the box door 2; one side of the box door 2 is rotatably connected to the box body 1, and the other side of the box door 2 is detachably connected to the box body 1 through a conventional lock structure, which is a conventional fixed structure and will not be described herein.
[0033] Reference Figure 1 and Figure 2 An elastic sealing strip 22 is fixedly provided on the side of the box door 2 facing the box body 1, and a sealing gasket 11 is fixedly provided on the side of the box body 1 facing the box door 2, wherein the elastic sealing strip 22 and the sealing gasket 11 are both made of rubber material, and a sealing ring groove 111 is opened on the sealing gasket 11 for the elastic sealing strip 22 to be inserted into. When the box door 2 is in a closed state, the elastic sealing strip 22 on the box door 2 is inserted into the sealing ring groove 111, thereby reducing the possibility of external impurities entering the interior of the box body 1 through the connection gap between the box door 2 and the box body 1.
[0034] Reference Figure 4 and Figure 5 A heat dissipation assembly 3 is provided on the side of the box body 1, wherein the heat dissipation assembly 3 includes a heat dissipation fan 31 provided on the side wall of the box body 1, and a control button 32 for controlling the opening and closing of the heat dissipation fan 31 (see Figure 6 ), the heat dissipation fan 31 is a fan driven by a conventional motor, which will not be described in detail here; a plurality of heat dissipation openings 12 are provided on the side wall of the box body 1 away from the heat dissipation fan 31. When the electric energy meter box is in use, the heat dissipation fan 31 and the heat dissipation openings 12 can form a circulation of air inside and outside the box body 1, and the outside air can enter from the heat dissipation openings 12, while the air with a higher temperature inside the box body 1 can be discharged through the heat dissipation fan 31.
[0035] Reference Figure 4 A protective component 4 for protecting the heat dissipation port 12 and the heat dissipation fan 31 is provided on the outer side of the box body 1; the protective component 4 includes a protective cover 41 fixedly arranged on the outer side of the heat dissipation port 12 and the heat dissipation fan 31, and a downward opening is provided on the protective cover 41; the protective component 4 also includes a first barrier net 42 arranged at the lower opening of the protective cover 41, and the first barrier net 42 is a filter net, which is used to prevent the possibility of external dust or other impurities entering the interior of the box body 1 through the heat dissipation port 12 and the heat dissipation fan 31.
[0036] Reference Figure 5 and Figure 6 A trigger rod 23 is fixedly provided on the side of the box door 2 facing the box body 1, and an elastic pad 231 is fixedly provided on the side of the trigger rod 23 away from the box door 2. The elastic pad 231 is made of rubber. A fixing plate 13 for fixing a control button 32 is fixedly provided on the inner wall of the box body 1, and the control button 32 is fixed on the side of the fixing plate 13 facing the box door 2; when the box door 2 is in a closed state, the trigger rod 23 on the box door 2 can abut against the control button 32 on the fixing plate 13, and the cooling fan 31 is started at this time; when the box door 2 is opened, the trigger rod 23 releases the pressure on the control button 32, and the cooling fan 31 is turned off.
[0037] Reference Figure 5 and Figure 7The protection assembly 4 includes two protection covers 41 (see Figure 4 ) Two external barrier covers 43, four positioning blocks 431 are fixedly arranged on the four corner edges of the side of the barrier cover 43 facing the box body 1, and a first positioning slot 14 for the positioning block 431 to be embedded is provided on the outer surface of the box body 1; An elastic clamping part 45 is provided on the positioning block 431, wherein the elastic clamping part 45 includes a compression spring 451 and an arc-shaped protrusion 452. A placement groove 4311 is provided on the positioning block 431 for the compression spring 451 and the arc-shaped protrusion 452 to be placed. The compression spring 451 squeezes the arc-shaped protrusion 452 and makes a part of the arc-shaped protrusion 452 protrude from the placement groove 4311. The protrusion of the arc-shaped protrusion 452 is distributed as an arc surface, and the arc length corresponding to the arc surface cross-section is a minor arc. The side wall of the first positioning slot 14 is provided with a first positioning groove 141 for the protruding part of the arc-shaped protrusion 452 to be inserted.
[0038] Reference Figure 8 and Fig. 9 The barrier cover 43 is an elastic telescopic structure that can be extended and restored along the length direction. The barrier cover 43 includes a fixed part 432 and a movable part 433, wherein the fixed part 432 is fixedly provided with a plurality of fixed rods 4321 on the side of the movable part 433, and the movable part 433 is provided with a fixed cavity 4331 for the fixed rods 4321 to be inserted and slided, and a return spring 434 is provided inside the fixed cavity 4331, and the two ends of the return spring 434 are respectively pressed against the bottom side of the fixed rods 4321 and the fixed cavity 4331. A second barrier net 44 is fixedly provided on one side of the barrier cover 43, and the second barrier net 44 is a conventional filter net, and the second barrier net 44 is fixedly provided on the vertical side of the fixed part 432.
[0039] In other embodiments, a telescopic rod (not shown) can be added to the middle of the return spring 434, similar to a spring structure, so that the return spring 434 is sleeved on the outer periphery of the telescopic rod, thereby reducing the possibility of bending of the return spring 434 during compression or recovery. It will not be repeated here.
[0040] Reference Fig. 9 and Fig.10 A shock absorbing assembly 5 is provided on the side of the box body 1, wherein the shock absorbing assembly 5 includes a shock absorbing support plate 51 and four damping springs 52 arranged on the shock absorbing support plate 51, and the damping spring 52 is a conventional shock absorbing structure, which is not described here; one end of the damping spring 52 is fixedly connected to the shock absorbing support plate 51, and the other end of the damping spring is fixed by bolts to achieve a detachable connection with the outer side surface of the box body 1; two waist-shaped holes 511 are provided on the shock absorbing support plate 51, which is convenient for the staff to use bolts to fix the shock absorbing support plate 51 to the surface to be installed.
[0041] Reference Fig. 9 and Fig.11The damping support plate 51 is provided with a fixing groove 512 for the bottom side of the blocking cover 43 to be embedded, and a second positioning slot 513 for the positioning block 431 to be embedded is provided on the side wall of the fixing groove 512, and a second positioning groove 5131 for the elastic clamping member 45 to be inserted is provided on the side wall of the second positioning slot 513; When the blocking cover 43 is on the cooling fan 31 (see Figure 4 ) and heat dissipation vents 12 (see Figure 4 ) when the external protection is provided, the positioning block 431 on the upper part of the blocking cover 43 is inserted into the first positioning slot 14 on the upper part of the box body 1, and the positioning block 431 on the lower part of the blocking cover 43 is inserted into the first positioning slot 14 on the lower part of the box body 1. At this time, the fixing rod 4321 is completely inserted into the fixing cavity 4331, and the return spring 434 is squeezed; When the barrier cover 43 is used as an elastic support for the shock-absorbing support plate 51, the positioning block 431 on the upper part of the barrier cover 43 is inserted into the first positioning slot 14 on the upper part of the box body 1, the lower side of the barrier cover 43 is inserted into the fixing slot 512 on the shock-absorbing support plate 51, and the positioning block 431 on the lower part of the barrier cover 43 is inserted into the second positioning slot 513 on the shock-absorbing support plate 51; and at this time, the lower side edge of the fixing portion 432 is lower than the protective cover 41 (see Figure 4 ) can also be used to protect the protective cover 41 (see Figure 4 ) to protect the outer sides.
[0042] The implementation principle of the embodiment of the present application is: When the box door 2 is in a closed state, the trigger rod 23 on the box door 2 can abut against the control button 32 on the fixed plate 13, and the cooling fan 31 is started; when the box door 2 is opened, the trigger rod 23 releases the pressure on the control button 32, and the cooling fan 31 is turned off; the protective cover 41 can serve as a protective structure to protect the heat dissipation port 12 and the outside of the cooling fan 31, and can also serve as an elastic supporting structure to support the box body 1.
[0043] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0044] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An outdoor electric energy meter box, comprising a box body (1) and a box door (2) arranged on the box body (1), one side of the box door (2) is rotatably connected to the box body (1), and the other side of the box door (2) is detachably connected to the box body (1); It is characterized in that An elastic sealing strip (22) is provided on the side of the box door (2) facing the box body (1), a sealing gasket (11) is provided on the side of the box body (1) facing the box door (2), and a sealing ring groove (111) is provided on the sealing gasket (11) for inserting the elastic sealing strip (22).
2. An outdoor electric energy meter box according to claim 1, characterized in that: A heat dissipation assembly (3) is provided on the side of the box (1), and the heat dissipation assembly (3) comprises a heat dissipation fan (31) provided on the side wall of the box (1), and a control button (32) for controlling the opening and closing of the heat dissipation fan (31); and a plurality of heat dissipation openings (12) are provided on the side wall of the box (1) away from the heat dissipation fan (31); The outer side surface of the box body (1) is provided with a protection component (4) for protecting the heat dissipation port (12) and the heat dissipation fan (31); the protection component (4) comprises a protection cover (41) arranged on the outer side surfaces of the heat dissipation port (12) and the heat dissipation fan (31); and the protection cover (41) is provided with a downward opening.
3. An outdoor electric energy meter box according to claim 2, characterized in that: A trigger rod (23) is provided on the side of the box door (2) facing the box body (1), and a fixing plate (13) for fixing a control button (32) is provided on the inner wall of the box body (1). The trigger rod (23) on the box door (2) can abut against the control button (32) when the box door (2) is closed.
4. An outdoor electric energy meter box according to claim 3, characterized in that: An elastic pad (231) is provided on the side of the trigger rod (23) away from the box door (2).
5. An outdoor electric energy meter box according to claim 2, characterized in that: The protection assembly (4) further comprises a first barrier net (42) arranged at the lower opening of the protection cover (41).
6. An outdoor electric energy meter box according to claim 2, characterized in that: The protective assembly (4) comprises a barrier cover (43) arranged outside the protective cover (41), and a second barrier net (44) is arranged on the side of the barrier cover (43); a plurality of positioning blocks (431) are arranged on the side edge of the barrier cover (43) facing the box body (1), and a first positioning slot (14) for the positioning block (431) to be embedded is opened on the outer surface of the box body (1).
7. An outdoor electric energy meter box according to claim 6, characterized in that: A shock absorbing assembly (5) is provided on the side of the box body (1), and the shock absorbing assembly (5) comprises a shock absorbing support plate (51) and a plurality of damping springs (52) arranged on the shock absorbing support plate (51), the end of the damping spring (52) away from the shock absorbing support plate (51) is connected to the outer side surface of the box body (1), and the shock absorbing support plate (51) is provided with a plurality of waist-shaped holes (511).
8. An outdoor electric energy meter box according to claim 7, characterized in that: One end of the damping spring (52) is fixedly connected to the shock-absorbing support plate (51), and the other end of the blocking spring is detachably connected to the outer side surface of the box body (1).
9. An outdoor electric energy meter box according to claim 8, characterized in that: The barrier cover (43) is an elastic telescopic structure capable of being extended and restored along the length direction. The shock-absorbing support plate (51) is provided with a fixing groove (512) for the barrier cover (43) to be embedded in. The side wall of the fixing groove (512) is provided with a second positioning slot (513) for the positioning block (431) to be embedded in.
10. An outdoor electric energy meter box according to claim 9, characterized in that: The positioning block (431) is provided with an elastic clamping piece (45), the side wall of the first positioning slot (14) is provided with a first positioning groove (141) for the elastic clamping piece (45) to be inserted, and the side wall of the second positioning slot (513) is provided with a second positioning groove (5131) for the elastic clamping piece (45) to be inserted.