A maintenance-free outdoor electric energy metering box

Abstract

The application provides a kind of maintenance-free outdoor electric energy metering box, relating to the field of smart grid, comprising box shell, partition, front cover assembly, transverse air passage, switchable state cut-off component, dehumidification box, refrigeration component, fan assembly and external circulation air inlet component. By designing the partition to separate the box shell into middle chamber, first chamber and second chamber, and setting the dehumidification box, refrigeration component and fan assembly in the second chamber, and installing the switchable state cut-off component in the transverse air passage to guide the gas to the outside of the box shell, the gas internal circulation between the first chamber, middle chamber, second chamber and transverse air passage can be formed, the gas flow is dehumidified when passing through the dehumidification box, ensuring the safe and stable operation of each electrical component in the middle chamber and first chamber, and prolonging the service life. Compared with directly placing a desiccator, the dehumidification effect is better.

Description

Technical Field

[0001] This invention relates to smart grids and belongs to the field of electricity metering, specifically a maintenance-free outdoor electricity metering box. Background Technology

[0002] Outdoor power metering boxes (hereinafter referred to as "metering boxes") are outdoor infrastructures used in power systems to install and protect key metering equipment such as power meters, transformers, and data acquisition terminals. The stability of their internal environment is directly related to the accuracy of metering data, equipment lifespan, and power grid operation safety.

[0003] Currently, widely deployed outdoor metering boxes generally face severe challenges from humid environments; especially in areas with large day-night temperature differences, long rainy seasons, or high air humidity, the temperature difference between the inside and outside of the box can easily cause water vapor in the internal air to reach the dew point and condense. This condensation phenomenon can cause a series of serious problems: (1) it can cause metal components (such as terminals, circuit breakers, etc.) to corrode, increase contact resistance, and cause exothermic failures; (2) it can form a water film on the insulation surface, reduce the electrical insulation strength, and may cause creepage, flashover, or even short circuit accidents; (3) it can directly damage the precision electronic energy meter or data acquisition module, causing metering inaccuracies or interruptions.

[0004] Currently used outdoor power metering boxes have ventilation holes or waterproof ventilation valves installed in the box. Although this method can balance the air pressure and temperature difference inside and outside through natural air convection, it cannot prevent the entry of humid air. It is basically ineffective in high temperature and high humidity environments and may even introduce more moisture, so the moisture-proof effect is minimal. Alternatively, silicone bags, calcium chloride and other adsorbents are placed inside the box. This method has some effect in the early stage, but the adsorbent will quickly become saturated and ineffective. It requires maintenance personnel to open the box frequently for inspection and replacement, and cannot achieve "maintenance-free".

[0005] Based on existing moisture-proof technology for outdoor metering boxes, this application provides an outdoor power metering box with good moisture-proof effect and no maintenance required. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a maintenance-free outdoor power metering box, which solves the problems of poor moisture protection, frequent opening for inspection and replacement of adsorbents, and complex maintenance processes in existing outdoor power metering boxes.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A maintenance-free outdoor power metering box includes: A housing, wherein a front cover assembly is mounted on the front side of the housing; The inner side of the box shell is fixedly connected to two partitions, which divide the interior of the box shell into a central chamber, a first chamber located on both sides of the central chamber, and a second chamber. The partition has a first air hole on its side and in the upper part. A horizontal air passage connecting the first chamber and the second chamber is fixedly installed at the bottom of the middle chamber. A switchable flow-blocking component that leads the gas to the outside of the housing is installed in the horizontal air passage. The second chamber is equipped with a dehumidification box, a refrigeration unit, and a fan unit, arranged from top to bottom. The top of the enclosure is provided with an external air circulation intake assembly corresponding to the top of the dehumidification box, and the dehumidification box is a silica gel desiccant box.

[0008] Preferably, the dehumidifier box includes: The carrier shell has multiple carrier mesh plates fixedly installed inside, and is filled with silica gel desiccant. The top of the carrier shell has an external circulation air inlet corresponding to the external circulation air inlet assembly, the bottom of the carrier shell has an air outlet corresponding to the channel of the refrigeration assembly, and the side of the carrier shell has a main air inlet corresponding to the first air hole.

[0009] Preferably, the cooling component includes: A slot is provided on the side of the housing and recessed into the second chamber. A PCT cooling chip and a heat dissipation cover are fixedly installed inside the slot. The cold end of the PCT cooling chip is attached to the inner wall of the slot. An airflow guide block is fixedly installed on the side of the separator, and the airflow guide block forms an airflow channel with the inner wall of the slot.

[0010] Preferably, the switchable flow-blocking component includes: The first row of holes opened on the side of the transverse airway; A sliding plate that slides with the bottom of the housing has a second row of holes. The overlap and stagger of the first row of holes and the second row of holes are used to control the communication between the inside of the horizontal air passage and the outside of the housing. A slanted back frame, one end of which is hinged to a sliding plate, and a blocking plate is fixedly connected to the part of the slanted back frame that extends into the horizontal air passage. A connecting rod, one end of which is hinged to the inclined back frame and the other end of which is hinged to the inner bottom of the transverse air passage; A protective shell is fixedly connected to the bottom of the box shell. A telescopic component is fixedly installed inside the protective shell, and the telescopic end of the telescopic component is fixedly connected to the sliding plate.

[0011] Preferably, the external circulation intake assembly includes: The tube body has a cap fixedly connected to its top end, and a gap is provided between the inner side of the cap and the outer side of the tube body. The side of the tube body has toothed holes corresponding to the gap. A ring-shaped component, a spring, and an electromagnetic component are provided on the tube body and below the cap. The spring is connected between the ring-shaped component and the top surface of the housing, and the electromagnetic component is fixedly connected to the top surface of the housing. A heating mesh is installed inside the tube.

[0012] Preferably, a corrugated pipe is provided on the tube body and located outside the annular component, spring, and electromagnetic component.

[0013] Preferably, the front cover assembly includes: The main cover plate has a transparent section. A connecting frame corresponding to the partition is fixedly connected to the side of the main cover plate. The connecting frame and the partition are fixedly installed by bolts. Two auxiliary door panels corresponding to the first chamber and the second chamber are hinged to the side of the main cover plate.

[0014] Preferably, a mounting bracket and a back pad are fixedly provided on the back of the housing.

[0015] Preferably, the central chamber is used to install power metering elements, the first chamber is used to install power distribution elements, and the side of the housing has an inlet hole corresponding to the first chamber.

[0016] The preferred option also includes: A temperature sensor and a first humidity sensor are installed inside the central chamber. A second humidity sensor is installed on the outside of the housing; and The MCU processor is connected to the temperature sensor, the first humidity sensor, and the second humidity sensor. The control terminals of the switchable flow-blocking component, the cooling component, the fan component, and the external air intake component are all connected to the MCU processor.

[0017] This invention provides a maintenance-free outdoor power metering box. It has the following advantages: This invention divides the interior of the housing into a central chamber, a first chamber, and a second chamber using a partition. A dehumidifier, a refrigeration unit, and a fan assembly are installed in the second chamber. A switchable flow-blocking component is installed in the horizontal air duct to guide gas to the outside of the housing. This allows for internal gas circulation between the first chamber, the central chamber, the second chamber, and the horizontal air duct. As the gas passes through the dehumidifier, it is dehumidified, ensuring the safe and stable operation of the electrical components in the central and first chambers and extending their service life. Compared to directly placing a dryer, this method offers better dehumidification. Furthermore, the refrigeration unit cools the airflow during the circulation process, keeping the temperature inside the housing within the safe operating range of the electrical components and preventing accidents.

[0018] This invention, through the additional design of a switchable flow-blocking component and an external circulation air intake component, can switch to an external circulation airflow path along the external circulation air intake component - dehumidification box - refrigeration component - fan component - horizontal air duct - switchable flow-blocking component. When the air outside the casing is dry, the external circulation airflow is used to repair the silica gel desiccant, achieving a maintenance-free effect during long-term operation of the equipment. Attached Figure Description

[0019] Figure 1 This is a perspective view of a maintenance-free outdoor power metering box proposed in this invention; Figure 2 This is a front view of a maintenance-free outdoor power metering box proposed in this invention; Figure 3 This is a top view of a maintenance-free outdoor power metering box proposed in this invention; Figure 4 This is a side view of a maintenance-free outdoor power metering box proposed in this invention; Figure 5 for Figure 3 Cross-sectional view of section line AA in the middle; Figure 6 for Figure 5 Enlarged view of section B in the middle; Figure 7 This is a three-dimensional front view of a maintenance-free outdoor power metering box after the front cover assembly has been removed, as proposed in this invention. Figure 8 This is a perspective view of the dehumidification box of a maintenance-free outdoor power metering box proposed in this invention; Figure 9 This is a perspective view of the front cover assembly of a maintenance-free outdoor power metering box proposed in this invention; Figure 10 This is a schematic diagram of the switchable current-cutting component of a maintenance-free outdoor power metering box proposed in this invention when it is open. Figure 11 for Figure 5 A magnified view of a portion of point C.

[0020] The components include: 1. Shell; 2. Divider; 3. Front cover assembly; 301. Main cover plate; 302. Transparent section; 303. Connecting frame; 304. Secondary door panel; 4. Mounting bracket; 5. Cable inlet; 6. Back pad; 7. First air vent; 8. Middle chamber; 9. First chamber; 10. Second chamber; 11. Horizontal air duct; 12. Dehumidifier; 121. Carrier shell; 122. Air outlet; 123. Main air inlet; 124. External circulation air inlet; 125. Carrier mesh plate; 13. Refrigeration assembly; 131. PCT refrigeration element; 13 2. Heat dissipation cover; 133. Airflow guide block; 134. Airflow channel; 14. Fan assembly; 15. Switchable flow-blocking assembly; 151. First row of holes; 152. Sliding plate; 153. Second row of holes; 154. Protective shell; 155. Telescopic component; 156. Slanted back frame; 157. Blocking plate; 158. Connecting rod; 16. External circulation air intake assembly; 161. Pipe body; 162. Cap; 163. Gap part; 164. Toothed hole; 165. Electromagnetic component; 166. Ring component; 167. Spring; 168. Heating mesh. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0022] like Figures 1-11 As shown, this embodiment of the invention provides a maintenance-free outdoor power metering box, belonging to the field of smart grids. It is suitable for the installation and use of high-voltage power metering equipment for long-term outdoor use, ensuring the stable operation of the power metering equipment and extending its service life. Specifically, it includes: a box shell 1, a partition 2, a front cover assembly 3, a horizontal air duct 11, a switchable flow interception assembly 15, a dehumidification box 12, a cooling assembly 13, a fan assembly 14, and an external circulation air intake assembly 16.

[0023] The enclosure 1 is typically wall-mounted onto other electrical supports. A front cover assembly 3 is installed on the front side of the enclosure 1, covering the front port of the enclosure 1 to create a sealed space between the front cover assembly 3 and the enclosure 1. A sealing strip is usually designed at the contact point between the front cover assembly 3 and the enclosure 1. Two partitions 2 are fixedly connected to the inside of the enclosure 1; for example... Figure 7As shown, two partitions 2 are distributed in parallel and spaced apart, dividing the interior of the housing 1 into a central chamber 8, a first chamber 9 located on both sides of the central chamber 8, and a second chamber 10. The central chamber 8 is used to install the core power metering equipment, the first chamber 9 is used to install power distribution components, such as terminals and safety switches, and the second chamber 10 is used to install functional components such as the dehumidification box 12, the refrigeration assembly 13, and the fan assembly 14.

[0024] A first air hole 7 is provided on the side and upper part of the partition 2, so that the middle chamber 8 is in communication with the first chamber 9 and the second chamber 10. A horizontal air passage 11 connecting the first chamber 9 and the second chamber 10 is fixedly installed at the bottom of the middle chamber 8. A switchable flow-blocking component 15 is installed in the horizontal air passage 11 to guide the gas to the outside of the housing 1. The switchable flow-blocking component 15 has two states. In one state, the airflow inside the horizontal air passage 11 flows normally and is used in the housing. In the second state, the airflow inside the horizontal air passage 11 is guided to the outside of the shell 1. During the silica gel desiccant restoration stage, the airflow carrying water vapor is directly discharged from the shell 1 (forming an external circulation). The second chamber 10 is arranged from top to bottom with a dehumidification box 12, a refrigeration component 13, and a fan component 14. The top of the shell 1 is provided with an external circulation air intake component 16 corresponding to the top of the dehumidification box 12. The dehumidification box 12 is a silica gel desiccant box. Silica gel desiccant is a recyclable desiccant.

[0025] When the humidity inside the casing 1 is high, start the fan of the air fan assembly 14. Please refer to the attached diagram. Figure 5 The fan assembly 14 drives the gas to flow along the horizontal air passage 11 and enter the first chamber 9. The air pressure inside the first chamber 9 increases, while the air pressure inside the second chamber 10 decreases. The airflow enters the middle chamber 8 through the first air hole 7 of the partition 2 on the left. The airflow in the middle chamber 8 enters the second chamber 10 through the first air hole 7 of the partition 2 on the right. This part of the airflow passes through the dehumidification box 12 and the cooling assembly 13 in sequence. During the above circulation process, the silica gel desiccant inside the dehumidification box 12 absorbs the moisture in the airflow, keeping the airflow dry. In some cases (e.g., when the outdoor temperature is high or the electrical components inside the casing 1 operate at high power for a long time), the heat generated by the electrical components inside the casing 1 cannot be effectively dissipated. During the above gas circulation process, the cooling assembly 13 can be powered on to cool the circulating gas inside the casing 1, ensuring that the electrical components inside the casing 1 can operate stably.

[0026] When the air outside the casing 1 is dry, the fan of the air fan assembly 14 can be started, and power can be supplied to the external air circulation intake assembly 16. The switchable throttling assembly 15 switches to its second state. Please refer to the appendix. Figure 5The fan assembly 14 drives the gas to flow along the horizontal air duct 11 and then along the switchable flow interceptor 15 to the outside of the housing 1. The air pressure inside the second chamber 10 decreases. At this time, since there is no gas replenishment in the middle chamber 8 and the first chamber 9, a negative pressure state is also formed. The second chamber 10 can only draw air from the external circulation air intake assembly 16 to form an external circulation airflow path of external circulation air intake assembly 16-dehumidification box 12-cooling assembly 13-fan assembly 14-horizontal air duct 11-switchable flow interceptor 15. The dry gas passes through the dehumidification box 12 and carries away the moisture on the surface of the silica gel desiccant, thereby automatically repairing the dehumidification box 12 and achieving a maintenance-free effect during long-term operation of the equipment.

[0027] In one embodiment, the dehumidification box 12 includes: a carrier shell 121, a plurality of carrier mesh plates 125, and silica gel desiccant. The carrier shell 121 is fixedly provided with a plurality of carrier mesh plates 125. The carrier shell 121 is filled with silica gel desiccant. The carrier mesh plates 125 maintain the uniform distribution of silica gel desiccant and ensure that the airflow passes smoothly through the gaps between the silica gel desiccant. An external circulation air inlet 124 corresponding to the external circulation air inlet assembly 16 is provided on the top of the carrier shell 121. An air outlet 122 corresponding to the channel of the refrigeration assembly 13 is provided on the bottom of the carrier shell 121. A main air inlet 123 corresponding to the first air hole 7 is provided on the side of the carrier shell 121.

[0028] Airflow can flow downwards from the external circulation inlet 124 through the carrier shell 121, come into contact with the silica gel desiccant filled inside the carrier shell 121, and then flow downwards from the outlet 122; alternatively, it can enter the carrier shell 121 from the side main inlet 123, come into contact with the silica gel desiccant filled inside the carrier shell 121, and then flow downwards from the outlet 122.

[0029] In one embodiment, the cooling assembly 13 includes an airflow guide block 133 and a slot recessed into the second chamber 10 on the side of the housing 1. A PCT cooling chip 131 and a heat dissipation cover 132 are fixedly installed inside the slot. When the PCT cooling chip 131 is powered on, its cold end is cooled, and the cold end of the PCT cooling chip 131 is attached to the inner wall of the slot. The heat dissipation cover 132 is used to fix the position of the PCT cooling chip 131 and can assist the hot end of the PCT cooling chip 131 to dissipate heat quickly. The airflow guide block 133 is fixedly installed on the side of the separator 2, and the airflow guide block 133 and the inner wall of the slot form an airflow channel 134.

[0030] The gas flowing downward from the outlet 122 passes through the airflow channel 134. If the PCT cooling chip 131 is not energized, the airflow will not be cooled; if the PCT cooling chip 131 is energized, the gas passing through the airflow channel 134 will be cooled.

[0031] In one embodiment, the switchable flow-blocking assembly 15 includes: a first row of holes 151 opened on the side of the horizontal air passage 11, a sliding plate 152 that slides with the bottom of the housing 1, a slanted back frame 156, a blocking plate 157, a connecting rod 158, a protective shell 154, and a telescopic member 155.

[0032] The sliding plate 152 has a second row of holes 153. The overlap and offset of the first row of holes 151 and the second row of holes 153 are used to control the communication between the inside of the horizontal air passage 11 and the outside of the housing 1. In actual use, the position of the sliding plate 152 is adjusted by sliding to switch the position. When the first row of holes 151 and the second row of holes 153 overlap, the gas inside the horizontal air passage 11 can flow to the outside of the housing 1 through the first row of holes 151 and the second row of holes 153. One end of the inclined back frame 156 is connected to the sliding plate 152. 52. The portion of the slanted back frame 156 extending into the horizontal air passage 11 is fixedly connected to a blocking plate 157. One end of the connecting rod 158 is hinged to the slanted back frame 156, and the other end of the connecting rod 158 is hinged to the inner bottom of the horizontal air passage 11. The protective shell 154 is fixedly connected to the bottom of the housing 1. A telescopic component 155 is fixedly installed inside the protective shell 154. The telescopic end of the telescopic component 155 is fixedly connected to the sliding plate 152. The telescopic component 155 is preferably an electric telescopic component, which operates smoothly and has high control precision.

[0033] like Figure 6 As shown, the telescopic component 155 is in an extended state, the first row of holes 151 and the second row of holes 153 are misaligned, and the blocking plate 157 is in an open state (corresponding to one of the states mentioned above). The user controls the telescopic component 155 to retract, pulling the sliding plate 152 to slide to the left. The first row of holes 151 aligns with the second row of holes 153, and the sliding plate 152 causes the bottom end of the slanted back frame 156 to move to the left. The connecting rod 158 rotates counterclockwise, and the middle part of the slanted back frame 156 is pushed upwards by the connecting rod 158, forming a... Figure 10 The state shown is that the blocking plate 157 is in the closed state (corresponding to the second state mentioned above).

[0034] In one embodiment, the external circulation intake assembly 16 includes: a pipe body 161, a cap 162, an annular component 166, a spring 167, an electromagnetic component 165, and a heating mesh 168.

[0035] A cap 162 is fixedly connected to the top of the tube body 161. A gap 163 is provided between the inner side of the cap 162 and the outer side of the tube body 161. A toothed hole 164 corresponding to the gap 163 is provided on the side of the tube body 161. The toothed hole 164 allows the gap 163 to communicate with the interior of the tube body 161. An annular component 166, a spring 167, and an electromagnetic component 165 are provided on the tube body 161 and below the cap 162. The spring 167 is connected between the annular component 166 and the top surface of the housing 1. The electromagnetic component 165 is fixedly connected to the top surface of the housing 1. A heating mesh 168 is provided inside the tube body 161. The heating mesh 168 is used to heat the gas flowing downward through the tube body 161. The high-temperature gas passes through the silica gel desiccant, which can better remove the moisture on the surface of the silica gel desiccant.

[0036] In one state, the spring 167 pushes the annular component 166 upward, and the annular component 166 blocks the bottom port of the gap 163, so the external circulation air intake assembly 16 cannot enter the gas. In another state, the electromagnetic component 165 is energized, and it attracts the annular component 166 downward. The annular component 166 moves downward against the elastic force of the spring 167, and the bottom port of the gap 163 is in an open state. The external gas can enter the tube 161 through the gap 163 and the toothed hole 164, and then continue to flow downward.

[0037] In one embodiment, a bellows is provided on the tube body 161 and outside the annular member 166, spring 167, and electromagnetic member 165. The top end of the bellows is fixedly connected to the annular member 166, and the bottom end of the bellows is fixedly connected to the top surface of the housing 1. The bellows itself can extend and retract, and it covers the annular member 166, spring 167, and electromagnetic member 165 inside, thus protecting the annular member 166, spring 167, and electromagnetic member 165.

[0038] In one embodiment, the front cover assembly 3 includes: a main cover plate 301 and two sub-door plates 304; the main cover plate 301 is provided with a transparent part 302 so that external personnel can observe the power metering equipment installed in the central chamber 8; a connecting frame 303 corresponding to the partition 2 is fixedly connected to the side of the main cover plate 301; the connecting frame 303 and the partition 2 are fixedly installed by bolts; and two sub-door plates 304 corresponding to the first chamber 9 and the second chamber 10 are hinged to the side of the main cover plate 301.

[0039] Throughout the entire use process, the power metering device inside the central chamber 8 does not require maintenance. The main cover plate 301 must be removed before the power metering device inside the central chamber 8 can be taken out, ensuring that the power metering device will not be stolen during outdoor use.

[0040] In one embodiment, a mounting bracket 4 and a back pad 6 are fixedly provided on the back of the enclosure 1. The mounting bracket 4 is designed as a pole-mounted shape (corresponding to installation on a utility pole) / a bent angle steel frame (corresponding to installation on a wall) according to actual needs. The back pad 6 can protect the back of the enclosure 1, avoid impact during installation, and after installation, a certain gap is formed between the back of the enclosure 1 and the fixed object, preventing rainwater from accumulating on the back of the enclosure 1 and aggravating corrosion.

[0041] In one embodiment, the central chamber 8 is used to install the power metering element, the first chamber 9 is used to install the power distribution element, and the side of the housing 1 is provided with an inlet hole 5 corresponding to the first chamber 9. Generally, a sealing sleeve is also designed at the inlet hole 5 to ensure the sealing of the inlet hole 5.

[0042] In one embodiment, it further includes: a temperature sensor disposed inside the central chamber 8, a first humidity sensor, a second humidity sensor disposed outside the housing 1, and an MCU processor.

[0043] The temperature sensor, the first humidity sensor, and the second humidity sensor are all connected to the MCU processor. The control terminals of the switchable flow-blocking component 15, the cooling component 13, the fan component 14, and the external air intake component 16 are all connected to the MCU processor. The MCU processor receives data from the temperature sensor, the first humidity sensor, and the second humidity sensor to determine whether dehumidification and heat dissipation are needed inside the housing 1, and whether the external environment is suitable for restoring the silica gel desiccant.

[0044] Under normal circumstances, when the first humidity sensor detects that the humidity inside the housing 1 is greater than its set first preset threshold, the fan assembly 14 is powered on; when the fan assembly 14 is in working state, when the temperature sensor detects that the temperature inside the housing 1 is greater than its set second preset threshold, the PCT cooling element 131 of the cooling assembly 13 is powered on; when the fan assembly 14 is not in working state, when the temperature sensor detects that the temperature inside the housing 1 is greater than its set third preset threshold, the fan assembly 14 is powered on and the PCT cooling element 131 of the cooling assembly 13 is powered on.

[0045] When the time interval between the last silica gel desiccant restoration and the previous time reaches the fourth preset threshold, and the second humidity sensor detects that the humidity outside the casing 1 is less than its set fifth preset threshold, the electromagnetic component 165 and the heating mesh 168 of the external circulation intake assembly 16 are energized, and the telescopic component 155 of the switchable flow-stopping assembly 15 is driven to retract, and the fan assembly 14 is energized. It is worth noting that after the silica gel desiccant restoration is completed, the electromagnetic component 165 and the heating mesh 168 are de-energized, and the telescopic component 155 of the switchable flow-stopping assembly 15 extends.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A maintenance-free outdoor power metering box, comprising: Box shell (1), with a front cover assembly (3) installed on the front side of the box shell (1); The characteristic feature is that two partitions (2) are fixedly connected to the inner side of the shell (1), and the two partitions (2) divide the interior of the shell (1) into a central chamber (8), a first chamber (9) located on both sides of the central chamber (8), and a second chamber (10). The partition (2) has a first air hole (7) on its side and in the upper part. The bottom of the middle chamber (8) is fixedly installed with a horizontal air passage (11) that connects the first chamber (9) and the second chamber (10). The horizontal air passage (11) is equipped with a switchable flow-blocking component (15) that leads the gas to the outside of the shell (1). The second chamber (10) is provided with a dehumidification box (12), a refrigeration assembly (13), and a fan assembly (14) from top to bottom. The top of the housing (1) is provided with an external circulation air intake assembly (16) corresponding to the top of the dehumidification box (12), and the dehumidification box (12) is a silica gel desiccant box.

2. The maintenance-free outdoor power metering box according to claim 1, characterized in that, The dehumidification box (12) includes: The carrier shell (121) has multiple carrier mesh plates (125) fixedly arranged inside it. The carrier shell (121) is filled with silica gel desiccant. The top of the carrier shell (121) is provided with an external circulation air inlet (124) corresponding to the external circulation air inlet assembly (16). The bottom of the carrier shell (121) is provided with an air outlet (122) corresponding to the channel of the refrigeration assembly (13). The side of the carrier shell (121) is provided with a main air inlet (123) corresponding to the first air hole (7).

3. The maintenance-free outdoor power metering box according to claim 2, characterized in that, The cooling component (13) includes: A slot is provided on the side of the housing (1) and recessed into the second chamber (10). A PCT cooling chip (131) and a heat dissipation cover (132) are fixedly installed inside the slot. The cold end of the PCT cooling chip (131) is attached to the inner wall of the slot. An airflow guide block (133) is fixedly installed on the side of the separator (2), and the airflow guide block (133) forms an airflow channel (134) with the inner wall of the slot.

4. The maintenance-free outdoor power metering box according to claim 1, characterized in that, The switchable interception component (15) includes: The first row of holes (151) is opened on the side of the transverse airway (11). A sliding plate (152) that slides with the bottom of the housing (1) has a second row of holes (153) on it. The overlap and offset of the first row of holes (151) and the second row of holes (153) are used to control the communication between the inside of the horizontal air passage (11) and the outside of the housing (1). The slanted back frame (156) has one end hinged to the sliding plate (152), and the part of the slanted back frame (156) extending into the horizontal air passage (11) is fixedly connected to the blocking plate (157). Link (158), one end of which is hinged to the inclined back frame (156), and the other end of which is hinged to the inner bottom of the transverse air passage (11); A protective shell (154) is fixedly connected to the bottom of the box shell (1). A telescopic component (155) is fixedly installed inside the protective shell (154). The telescopic end of the telescopic component (155) is fixedly connected to the sliding plate (152).

5. The maintenance-free outdoor power metering box according to claim 1, characterized in that, The external air intake assembly (16) includes: The tube body (161) has a cap (162) fixedly connected to its top end. A gap (163) is provided between the inner side of the cap (162) and the outer side of the tube body (161). The side of the tube body (161) is provided with toothed holes (164) corresponding to the gap (163). A ring-shaped component (166), a spring (167), and an electromagnetic component (165) are provided on the tube body (161) and below the cap (162). The spring (167) is connected between the ring-shaped component (166) and the top surface of the box shell (1), and the electromagnetic component (165) is fixedly connected to the top surface of the box shell (1). A heating mesh (168) is provided inside the tube (161).

6. The maintenance-free outdoor power metering box according to claim 5, characterized in that: A corrugated pipe is provided on the tube body (161) and outside the annular component (166), spring (167), and electromagnetic component (165).

7. The maintenance-free outdoor power metering box according to claim 1, characterized in that, The front cover assembly (3) includes: The main cover plate (301) has a transparent part (302) and a connecting frame (303) corresponding to the partition (2) is fixedly connected to the side of the main cover plate (301). The connecting frame (303) and the partition (2) are fixedly installed by bolts. The side of the main cover plate (301) is hinged with two auxiliary door panels (304) corresponding to the first chamber (9) and the second chamber (10) respectively.

8. The maintenance-free outdoor power metering box according to claim 1, characterized in that: The back of the housing (1) is fixedly provided with a mounting bracket (4) and a back pad (6).

9. A maintenance-free outdoor power metering box according to claim 1, characterized in that: The central chamber (8) is used to install the power metering element, the first chamber (9) is used to install the power distribution element, and the side of the housing (1) is provided with an inlet hole (5) corresponding to the first chamber (9).

10. A maintenance-free outdoor power metering box according to claim 1, characterized in that, Also includes: A temperature sensor and a first humidity sensor are installed inside the central chamber (8); A second humidity sensor is installed on the outside of the housing (1); as well as The temperature sensor, the first humidity sensor, and the second humidity sensor are all connected to the MCU processor. The control terminals of the switchable flow-blocking component (15), the cooling component (13), the fan component (14), and the external circulation intake component (16) are all connected to the MCU processor.

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