Electrical box

Abstract

The application discloses an electrical box, and belongs to the technical field of electric power. The electrical box comprises a shell, a dehumidification structure, a condensation part, and a drainage structure. The shell is provided with a first containing cavity. The dehumidification structure is provided with a waterproof and breathable film and the condensation part. The waterproof and breathable film is arranged between the first containing cavity and the second containing cavity. The condensation part is arranged at least partially in the second containing cavity. The drainage structure is provided with a first drainage port, and the first drainage port is communicated with the second containing cavity. In the application, the high-humidity gas entering the second containing cavity from the first containing cavity is condensed by utilizing the characteristics of the waterproof and breathable film, and the condensed water is limited in the second containing cavity and discharged through the drainage port, so that the condensed water cannot flow back to the first containing cavity. The dehumidified air is returned to the first containing cavity through the waterproof and breathable film, the condensed water is prevented from contacting the electrical elements in the first containing cavity, and the safety of the electrical box is improved.

Description

Technical Field

[0001] This application belongs to the field of power technology, specifically relating to an electrical box. Background Technology

[0002] In outdoor settings, the protective performance requirements for electrical enclosures used in photovoltaic and energy storage systems are becoming increasingly stringent. However, condensation easily forms inside these sealed enclosures, and prolonged condensation can cause irreversible damage to the equipment, significantly reducing its reliability and lifespan. To address this, dehumidifiers are typically installed inside the enclosures to condense moisture from the air inside, reducing humidity. However, the condensate formed by the dehumidifier can still come into contact with electrical components, affecting the safety of the electrical enclosure. Utility Model Content

[0003] This application provides an electrical box to address the technical problem that condensate formed by dehumidifier condensation may still come into contact with electrical components, affecting the safety of the electrical box.

[0004] Technical solution: The electrical box described in the embodiments of this application includes:

[0005] The housing has a first receiving cavity;

[0006] A dehumidification structure having a second receiving cavity, the dehumidification structure being provided with a waterproof and breathable membrane and a condensation section, the waterproof and breathable membrane being spaced between the first receiving cavity and the second receiving cavity;

[0007] The condenser section is at least partially disposed within the second receiving cavity;

[0008] The drainage structure has a first drain outlet, which is connected to the second receiving cavity.

[0009] In some embodiments, the dehumidification structure is disposed within the first receiving cavity.

[0010] In some embodiments, the first drain outlet is disposed on the housing.

[0011] In some embodiments, the dehumidification structure is disposed on the outside of the housing.

[0012] In some embodiments, the first drain outlet is disposed on the dehumidification structure.

[0013] In some embodiments, the drainage structure further includes a second drain outlet, which is connected to the first drain outlet. The first drain outlet is disposed on the dehumidification structure, and the second drain outlet is disposed on the housing, or the second drain outlet is disposed on the outside of the housing.

[0014] In some embodiments, the condensation section includes a semiconductor cooler having a cold end and a hot end, the cold end and the hot end being disposed within the second receiving cavity;

[0015] Alternatively, the cold end may be located inside the second receiving cavity, and the hot end may be located outside the dehumidification structure.

[0016] In some embodiments, the electrical box further includes a fan, which is distributed opposite to the hot end.

[0017] In some embodiments, the number of the waterproof and breathable membranes is provided in multiples, and at least one of the waterproof and breathable membranes is disposed opposite to the fan.

[0018] In some embodiments, the cold end is provided with a first fin, and the first fin is located within the second receiving cavity, and the hot end is provided with a second fin.

[0019] Beneficial effects: The electrical box in this embodiment forms two spaces by setting a first accommodating cavity and a second accommodating cavity. The high humidity gas in the first accommodating cavity enters the second accommodating cavity through a waterproof and breathable membrane. The condenser cools down the water vapor in the air and condenses it into liquid water. Due to the characteristics of the waterproof and breathable membrane, the condensate is confined in the second accommodating cavity and discharged through the drain outlet to prevent the condensate from flowing back into the first accommodating cavity. The dehumidified air returns to the first accommodating cavity through the waterproof and breathable membrane, preventing the condensate from contacting the electrical components in the first accommodating cavity and improving the safety of the electrical box. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the electrical box provided in an embodiment of this application;

[0022] Figure 2 A schematic diagram showing the relative positions of the condenser sections provided in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram showing the relative position of the dehumidification structure and the housing provided in the embodiments of this application;

[0024] Figure 4 A schematic diagram showing another relative position of the condenser section provided in an embodiment of this application;

[0025] Figure 5A schematic diagram of the first and second drain outlets provided in the embodiments of this application;

[0026] Figure 6 A schematic diagram of the drainage structure provided in the embodiments of this application;

[0027] Figure 7 Another schematic diagram of the drainage structure provided in the embodiments of this application;

[0028] Figure 8 Another schematic diagram of the drainage structure provided in the embodiments of this application;

[0029] Figure 9 A schematic diagram showing the relative positions of the condenser and dehumidification structure provided in an embodiment of this application;

[0030] Figure 10 This is a schematic diagram showing the dehumidification structure and the housing in another relative position according to an embodiment of this application;

[0031] Figure 11 A schematic diagram showing another relative position of the condenser and dehumidification structure provided in an embodiment of this application;

[0032] Figure 12 This is a schematic diagram of the structure of the fan and the waterproof and breathable membrane provided in the embodiments of this application;

[0033] Reference numerals: 1. Shell; 10. First receiving cavity; 11. Through hole; 2. Dehumidification structure; 20. Second receiving cavity; 21. Waterproof and breathable membrane; 22. Condensation section; 221. Semiconductor cooler; 2211. Cold end; 2212. Hot end; 2213. First fin; 2214. Second fin; 3. Drainage structure; 31. First drain outlet; 32. Second drain outlet; 4. Fan. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "height," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0036] Please combine them together Figure 1 and Figure 2 The electrical box in this embodiment includes a housing 1, a dehumidification structure 2 and a drainage structure 3. The housing 1 has a first receiving cavity 10, which is a relatively closed space. Electrical components such as circuit boards are installed in the first receiving cavity 10 and are isolated from the external environment of the electrical box.

[0037] The dehumidification structure 2 has a second receiving cavity 20. The dehumidification structure 2 is provided with a waterproof and breathable membrane 21 and a condenser section 22. The waterproof and breathable membrane 21 is spaced between the first receiving cavity 10 and the second receiving cavity 20, so that the first receiving cavity 10 and the second receiving cavity 20 are in communication. At least a portion of the condenser section 22 is disposed within the second receiving cavity 20. That is, the condenser section 22 can be entirely located within the second receiving cavity 20, or partially located within the second receiving cavity 20 with another portion located within the first receiving cavity 10, or partially located within the second receiving cavity 20 with another portion located outside the housing 1. The specific location can be determined according to the relative positions of the dehumidification structure 2 and the housing 1. The condenser section 22 has a cooling function, causing water vapor in the surrounding gas to condense into liquid water.

[0038] The drainage structure 3 has a first drain outlet 31, which is connected to the second receiving cavity 20 and is used to discharge the condensate in the second receiving cavity 20 to the outside of the shell 1.

[0039] When high-humidity gas is present in the first receiving cavity 10, the gas flows through the waterproof and breathable membrane 21 into the second receiving cavity 20. Forced cooling in the condenser causes water vapor to condense into liquid water, thus dehumidifying the gas. The dehumidified gas re-enters the first receiving cavity 10 through the waterproof and breathable membrane 21, while the condensate is intercepted by the membrane in the second receiving cavity 20 and discharged through the drain outlet. Both gas condensation and condensate discharge are isolated from the first receiving cavity 10, reducing the possibility of condensate contacting electrical components and thus improving the safety of the electrical box.

[0040] In some embodiments, the dehumidification structure 2 can be a hollow polyhedral structure, a cylindrical structure, or an arched structure, as long as the hollow interior can form a second receiving cavity 20. A waterproof and breathable membrane 21 is disposed on one or more sides, communicating the second receiving cavity 20 with the outside. Alternatively, the dehumidification structure 2 can also be a frame structure, with a membrane layer covering the outside of the frame, forming the second receiving cavity 20 by the membrane layer, wherein a portion of the membrane layer is a waterproof and breathable membrane 21.

[0041] Please combine them together Figure 1 and Figure 2 In some embodiments, the dehumidification structure 2 is disposed within the first receiving cavity 10 and is spaced apart from the electrical components within the first receiving cavity 10. The housing 1 serves to protect the dehumidification structure 2, increasing the utilization rate of the internal space of the first receiving cavity 10 and helping to save space occupied by the electrical box. In this embodiment, the number of waterproof and breathable membranes 21 can be one or more.

[0042] Please refer to Figure 2 In some embodiments, the first drain outlet 31 is disposed on the housing 1. Specifically, the first drain outlet 31 is disposed on the inner bottom surface of the housing 1, and one side of the dehumidification structure 2 has a hollow structure, and this side covers the first drain outlet 31 so that the first drain outlet 31 and the second receiving cavity 20 are connected. At this time, the drain structure 3 is part of the structure of the housing 1, which simplifies the structure and saves space.

[0043] Please combine them together Figure 3 and Figure 4 In some embodiments, the dehumidification structure 2 is disposed on the outside of the housing 1. Specifically, the dehumidification structure 2 is connected to the outer wall of the housing 1, and the housing 1 is provided with a through hole 11 at the corresponding connection position. A waterproof and breathable membrane 21 is disposed opposite to the through hole 11, allowing gas in the first receiving cavity 10 and the second receiving cavity 20 to circulate through the through hole 11 and the waterproof and breathable membrane 21. When part of the condenser 22 is located in the second receiving cavity 20, the other part of the condenser 22 can be disposed opposite to the through hole 11, or it can be disposed on the outside of the dehumidification structure 2, i.e., on the outside of the housing 1. The dehumidification structure 2 being on the outside of the housing 1 allows for convenient maintenance and replacement without opening the housing 1, which helps maintain the protection level requirements of the electrical components in the first receiving cavity 10. In this case, the dehumidification structure 2 can be configured as an independent external component for application in different types of electrical boxes.

[0044] In some other embodiments, the dehumidification structure 2 is connected to the outer wall of the shell 1, and the waterproof and breathable membrane 21 is disposed on the side of the dehumidification structure 2 adjacent to or opposite to the outer wall. In this case, the waterproof and breathable membrane 21 is separated from the shell 1, and the waterproof and breathable membrane 21 and the shell 1 can be connected by pipes to make the first receiving cavity 10 and the second receiving cavity 20 connected.

[0045] In some embodiments, the dehumidification structure 2 is disposed on the outside of the housing 1 and integrally formed with the housing 1. In this case, the dehumidification structure 2 can be regarded as a part protruding from the outer surface of the housing 1. The first receiving cavity 10 and the second receiving cavity 20 together form the internal space of the electrical box.

[0046] Please refer to Figure 4 In some embodiments, the first drain outlet 31 is provided on the dehumidification structure 2 and located on the inner bottom surface of the dehumidification structure 2. The condensate in the second receiving cavity 20 is directly discharged through the first drain outlet 31, which is convenient and flexible and can meet the drainage needs of the dehumidification structure 2 and the shell 1 in different relative positions.

[0047] Please refer to Figure 5 In some embodiments, the first drain outlet 31 is disposed on the dehumidification structure 2, and the drainage structure 3 further includes a second drain outlet 32, which is connected to the first drain outlet 31 and is disposed on the housing 1. Specifically, the dehumidification structure 2 is disposed in the first receiving cavity 10, and the side of the dehumidification structure 2 with the first drain outlet 31 is connected to the side of the housing 1 with the second drain outlet 32. The first drain outlet 31 and the second drain outlet 32 ​​are distributed opposite to each other and are directly connected.

[0048] Please refer to Figure 6 Alternatively, the drainage structure 3 may include either a drain valve or a drain pipe. The drain valve can be a one-way valve, a two-way valve, a solenoid valve, etc. The drain valve connects to both the dehumidification structure 2 and the housing 1. The end of the drain valve connected to the dehumidification structure 2 is the first drain port 31, and the end connected to the housing 1 is the second drain port 32. The first drain port 31 is higher than the second drain port 32. The connection structure between the drain pipe and the drain valve is the same and will not be described further here. On one hand, the drainage structure 3 is located within the first receiving cavity 10, reducing contact with the external environment of the housing 1 and maintaining the protection level requirements of the electrical box. On the other hand, the drainage structure 3 can be selected based on the internal space of the first receiving cavity 10 and the relative position of the dehumidification structure 2 and the housing 1, meeting the usage requirements under different operating conditions.

[0049] Please combine them together Figure 7 and Figure 8In some embodiments, the first drain outlet 31 is disposed on the dehumidification structure. The drainage structure 3 also includes a second drain outlet 32, which is connected to the first drain outlet 31 and is disposed on the outside of the housing 1. Specifically, the drainage structure 3 includes one or a combination of a drain valve and a drain pipe. The drain valve has at least two valve ports, one of which is the first drain outlet 31 and the other is the second drain outlet 32. The drain valve can specifically be a one-way valve to allow the condensate in the second receiving cavity 20 to be discharged unidirectionally out of the housing 1, preventing impurities in the external environment from entering the second receiving cavity 20. In addition to a one-way valve, the drain valve can also be a two-way valve, a solenoid valve, etc.

[0050] When the drainage structure 3 is a drain pipe, one end of the drain pipe is the first drain outlet 31 and is connected to the dehumidification structure 2, and the other end of the drain pipe is located outside the shell 1 and is the second drain outlet 32.

[0051] The condensate in the second receiving cavity 20 is discharged through the first drain outlet 31 and the second drain outlet 32. The drainage structure 3 is independent of the shell 1, and the second drain outlet 32 ​​is located on the outside of the shell 1, which reduces the space occupied inside the shell 1.

[0052] Please combine them together Figure 9 and Figure 10 In some embodiments, the condenser 22 includes a thermoelectric cooler 221, which has a cold end 2211 and a hot end 2212, both disposed within the second receiving cavity 20. The thermoelectric cooler 221, also known as a thermoelectric cooler or Peltier cooler, is a solid-state refrigeration device based on the thermoelectric effect. Its working principle is as follows: when electrons flow from an N-type semiconductor to a P-type semiconductor, heat is absorbed, causing the temperature of the cold end 2211 to decrease; when electrons flow from a P-type semiconductor to an N-type semiconductor, heat is released, causing the temperature of the hot end 2212 to rise.

[0053] The entire semiconductor cooler 221 is located within the second receiving cavity 20, making full use of the internal space of the second receiving cavity 20 and reducing the impact on the layout of electrical components in the first receiving cavity 10.

[0054] In some other embodiments, the condenser 22 includes a plate heat exchanger disposed in the second receiving cavity 20. The plate heat exchanger is connected to a refrigerant through a pipe, and the phase change of the refrigerant is used to achieve the cooling of the plate heat exchanger, thereby causing water vapor to condense.

[0055] Please combine them together Figure 1 and Figure 11In some embodiments, the condenser 22 includes a semiconductor cooler 221, which has a cold end 2211 and a hot end 2212. The cold end 2211 is disposed within the second receiving cavity 20, and the hot end 2212 is disposed outside the dehumidification structure 2. That is, the hot end 2212 can be inside the first receiving cavity 10 or outside the housing 1. The cold end 2211 and the hot end 2212 are located in different spaces, which can reduce mutual heat interference and improve the utilization rate of cooling capacity and dehumidification effect within the second receiving cavity 20.

[0056] Please refer to Figure 1 For example, when the dehumidification structure 2 is provided in the first receiving cavity 10, the hot end 2212 is located inside the first receiving cavity 10.

[0057] Please refer to Figure 11 For example, when the dehumidification structure 2 is located outside the housing 1, the hot end 2212 is located outside the housing 1.

[0058] Please combine them together Figure 1 , Figure 3 and Figure 11 In some embodiments, the electrical box also includes a fan 4, which is disposed opposite to the hot end 2212.

[0059] Please refer to Figure 1 For example, when both the dehumidification structure 2 and the hot end 2212 are located in the first receiving cavity 10, the fan 4 is also located in the first receiving cavity 10 and is located on the side of the hot end 2212 away from the cold end 2211.

[0060] For example, when the dehumidification structure 2 is disposed in the first receiving cavity 10 and the hot end 2212 is disposed in the second receiving cavity 20, the fan 4 may be disposed in the second receiving cavity 20.

[0061] Please refer to Figure 3 For example, when the dehumidification structure 2 is located on the outside of the housing 1 and the hot end 2212 is distributed opposite to the through hole 11, the fan 4 is located in the first receiving cavity 10.

[0062] For example, when the dehumidification structure 2 is located outside the housing 1 and the hot end 2212 is located inside the second receiving cavity 20, the fan 4 can be located inside the second receiving cavity 20. In the aforementioned case, the fan 4 serves two purposes: firstly, it enhances airflow, increasing the airflow speed between the first receiving cavity 10 and the second receiving cavity 20, thereby improving dehumidification efficiency; secondly, the fan 4 draws airflow to dissipate heat from the hot end 2212, ensuring the cooling effect of the cold end 2211.

[0063] Please refer to Figure 11For example, when both the dehumidification structure 2 and the hot end 2212 are located outside the housing 1, the fan 4 is also located outside the housing 1 and on the side of the hot end 2212 away from the cold end 2211. At this time, the fan 4 draws airflow toward the hot end 2212 to accelerate the heat dissipation of the hot end 2212.

[0064] Since the position of fan 4 corresponds to the position of hot end 2212, the fan 4 housing is correspondingly located outside the first receiving cavity 10, the second receiving cavity 20, or the dehumidification structure 2. It is only necessary to ensure that fan 4 can maintain a relatively distributed position with hot end 2212. During installation, fan 4 can be fixed by adhesive, fasteners, or a combination of bracket and fastener.

[0065] Please refer to Figure 12 In some embodiments, multiple waterproof and breathable membranes 21 are provided, and at least one waterproof and breathable membrane 21 is positioned opposite to the fan 4. The fan 4 is connected to the dehumidification structure 2 and is spaced apart from the waterproof and breathable membranes 21. The airflow driven by the fan 4 is directed towards the waterproof and breathable membranes 21, allowing the airflow to pass through the waterproof and breathable membranes 21 quickly, further improving dehumidification efficiency. Since the fan 4 is also positioned opposite to the hot end 2212, when the hot end 2212 is located in the first receiving cavity 10, the fan 4, the hot end 2212, and the cold end 2211 are arranged sequentially in the same direction. This arrangement can both enhance gas flow and heat dissipation of the hot end 2212, and also increase the versatility of the fan 4's placement location. Multiple waterproof and breathable membranes 21 are distributed on different sides of the dehumidification structure 2, which increases the gas flow area between the first receiving cavity 10 and the second receiving cavity 20, thereby increasing the airflow entering the second receiving cavity 20 at the same flow rate, which is beneficial for improving the dehumidification speed.

[0066] Please combine them together Figure 1 , Figure 3 as well as Figures 9 to 11 In some embodiments, the cold end 2211 is provided with a first fin 2213, and the first fin 2213 is located within the second receiving cavity 20. The hot end 2212 is provided with a second fin 2214. There are multiple first fins 2213 and second fins 2214, which are arranged at intervals to allow gas flow. The first fins 2213 and second fins 2214 increase the contact area between the thermoelectric cooler 221 and the gas, which helps to enhance heat exchange efficiency, improve the heat dissipation speed of the hot end 2212, and enhance the condensation effect of the cold end 2211.

[0067] Please refer to Figure 1 For example, when both the dehumidification structure 2 and the hot end 2212 are located in the first receiving cavity 10, the second fin 2214 is located outside the dehumidification structure 2, that is, the second fin 2214 is located inside the first receiving cavity 10.

[0068] Please refer to Figure 9 For example, when the dehumidification structure 2 is located within the first receiving cavity 10 and the hot end 2212 is located within the second receiving cavity 20, the second fin 2214 can be located within the second receiving cavity 20, or it can partially extend through the dehumidification structure 2 into the first receiving cavity 10 (e.g., Figure 6 ).

[0069] Please refer to Figure 3 For example, when the dehumidification structure 2 is located on the outside of the housing 1 and the hot end 2212 is distributed opposite to the through hole 11, the second fin 2214 penetrates the through hole 11 and is partially located in the first receiving cavity 10, or the second fin 2214 can also be entirely located in the second receiving cavity 20.

[0070] Please refer to Figure 10 For example, when the dehumidification structure 2 is located outside the housing 1 and the hot end 2212 is located inside the second receiving cavity 20, the second fin 2214 is also located in the second receiving cavity 20.

[0071] Please refer to Figure 11 For example, when both the dehumidification structure 2 and the hot end 2212 are located outside the housing 1, the second fin 2214 is located outside the dehumidification structure 2, that is, outside the housing 1.

[0072] In some embodiments, the waterproof and breathable membrane 21 includes one or more of polytetrafluoroethylene (PTFE) membrane, expanded polytetrafluoroethylene (ePTFE) membrane, and polyvinylidene fluoride (PVDF) nanofiber membrane. PTFE membrane, ePTFE membrane, and PVDF nanofiber membrane all possess breathability, waterproofness, and high-temperature resistance, meeting the requirements for dehumidification and isolation. The waterproof and breathable membrane 21 can adopt a single-layer or multi-layer structure, wherein the multi-layer structure can be made of the same material or a mixture of different materials.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0074] The electrical box provided in the embodiments of this application has been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electrical box, characterized in that, include: The housing (1) has a first receiving cavity (10); The dehumidification structure (2) has a second receiving cavity (20). The dehumidification structure (2) is provided with a waterproof and breathable membrane (21) and a condensation section (22). The waterproof and breathable membrane (21) is spaced between the first receiving cavity (10) and the second receiving cavity (20). A condenser section (22) is at least partially disposed within the second receiving cavity (20); The drainage structure (3) has a first drain outlet (31) which is connected to the second receiving cavity (20).

2. The electrical box according to claim 1, characterized in that, The dehumidification structure (2) is disposed in the first receiving cavity (10).

3. The electrical box according to claim 2, characterized in that, The first drain outlet (31) is provided on the housing (1).

4. The electrical box according to claim 1, characterized in that, The dehumidification structure (2) is disposed on the outside of the housing (1).

5. The electrical box according to claim 4, characterized in that, The first drain outlet (31) is provided on the dehumidification structure (2).

6. The electrical box according to claim 1, characterized in that, The drainage structure (3) further includes a second drain outlet (32), which is connected to the first drain outlet (31). The first drain outlet (31) is located in the dehumidification structure (2), and the second drain outlet (32) is located in the housing (1). Alternatively, the second drain outlet (32) is located on the outside of the housing (1).

7. The electrical box according to any one of claims 1 to 6, characterized in that, The condensation section (22) includes a semiconductor cooler (221), which has a cold end (2211) and a hot end (2212), and the cold end (2211) and the hot end (2212) are disposed in the second receiving cavity (20); Alternatively, the cold end (2211) is disposed inside the second receiving cavity (20), and the hot end (2212) is disposed outside the dehumidification structure (2).

8. The electrical box according to claim 7, characterized in that, The electrical box also includes a fan (4), which is distributed opposite to the hot end (2212).

9. The electrical box according to claim 8, characterized in that, The number of the waterproof and breathable membranes (21) is multiple, and at least one of the waterproof and breathable membranes (21) is arranged opposite to the fan (4).

10. The electrical box according to claim 7, characterized in that, The cold end (2211) is provided with a first fin (2213), and the first fin (2213) is located in the second receiving cavity (20). The hot end (2212) is provided with a second fin (2214).

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