Electric appliance box and air conditioning unit

Abstract

The utility model relates to an electric appliance box and an air conditioning unit, the electric appliance box comprises a box body (1), a plurality of electric devices (2) and a separator plate (3), a containing cavity (11) is arranged in the box body (1), the plurality of electric devices (2) are arranged in the containing cavity (11), the separator plate (3) is arranged in the containing cavity (11), and the separator plate (3) is configured to divide the containing cavity (11) into a first cavity (12) and a second cavity (13). When the electric appliance box is in a working state, the temperature in the first cavity (12) is different from the temperature in the second cavity (13), a first communication part (14) communicating the first cavity (12) and the second cavity (13) is arranged at the position, close to the top wall of the containing cavity (11), in the containing cavity (11), and a second communication part (15) communicating the first cavity (12) and the second cavity (13) is arranged at the position, close to the bottom wall of the containing cavity (11), in the containing cavity (11). And gas in the first cavity and gas in the second cavity circularly flow through the first communicating part and the second communicating part for heat exchange.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an electrical appliance box and an air conditioner unit. Background Art

[0002] The air conditioner electrical box contains various devices that generate heat during normal operation, such as PCB boards, frequency conversion modules, power transformers, and various scattered switching devices, voltage stabilizing devices, etc.

[0003] To ensure high protection performance of the electrical box, such as waterproof and dustproof, and to ensure the normal operation of electrical components, the structure of the electrical box needs to be sealed. However, at the same time, since there is no external heat dissipation, the temperature of the components will rise, causing damage to the components.

[0004] Therefore, it is a difficult problem to ensure that the temperature rise of the electronic components in the box does not exceed the preset standard under the condition that the electrical box is closed (without external ventilation holes).

[0005] It should be noted that the information disclosed in the background technology section of the utility model is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as admitting or suggesting in any form that the information constitutes the prior art known to those skilled in the art. The above statements are only used to provide background technology information related to the present application, and do not necessarily constitute the prior art. Utility Model Content

[0006] The embodiment of the utility model provides an electrical appliance box and an air conditioning unit, which can effectively reduce the local temperature of the electrical appliance box.

[0007] According to a first aspect of the present invention, there is provided an electrical appliance box, comprising:

[0008] A box body, wherein a receiving cavity is provided in the box body;

[0009] A plurality of electrical components are disposed in the receiving cavity; and

[0010] A partition is arranged in the accommodating chamber, and the partition is configured to separate the accommodating chamber into a first chamber and a second chamber. When the electrical box is in a working state, the temperature in the first chamber is different from the temperature in the second chamber. A first connecting portion connecting the first chamber and the second chamber is provided at a position near the top wall of the accommodating chamber, and a second connecting portion connecting the first chamber and the second chamber is provided at a position near the bottom wall of the accommodating chamber. The gas in the first chamber and the gas in the second chamber circulate through the first connecting portion and the second connecting portion to perform heat exchange.

[0011] In some embodiments, there is a first gap between the top of the partition and the top wall of the accommodating cavity, and the first gap forms a first connecting portion; and / or, there is a second gap between the bottom of the partition and the bottom wall of the accommodating cavity, and the second gap forms a second connecting portion.

[0012] In some embodiments, the partition is connected to the top wall of the accommodating cavity, and a first through hole is provided at a position of the partition near the top wall of the accommodating cavity, and the first through hole forms a first connecting portion; and / or, the partition is connected to the bottom wall of the accommodating cavity, and a second through hole is provided at a position of the partition near the bottom wall of the accommodating cavity, and the second through hole forms a second connecting portion.

[0013] In some embodiments, the temperature in the first cavity is greater than the temperature in the second cavity, and multiple electrical devices are disposed in the first cavity; or, the total heat generated by the electrical devices disposed in the first cavity is greater than the total heat generated by the electrical devices disposed in the second cavity.

[0014] In some embodiments, multiple electrical devices include a first electrical device, a second electrical device, a third electrical device and a fourth electrical device arranged in a first cavity, the heat generation of the first electrical device and the heat generation of the second electrical device are both greater than the heat generation of the third electrical device, and the heat generation of the first electrical device and the heat generation of the second electrical device are both greater than the heat generation of the fourth electrical device, the first electrical device and the second electrical device are arranged side by side near the bottom wall of the accommodating cavity, and the distance between the second electrical device and the bottom wall of the accommodating cavity is greater than the distance between the first electrical device and the bottom wall of the accommodating cavity, and the third electrical device and the fourth electrical device are arranged side by side near the top wall of the accommodating cavity.

[0015] In some embodiments, the first electrical device and the second electrical device have the same structure, and the arrangement directions of the first electrical device and the second electrical device differ by 180°, so that the high temperature zone of the first electrical device and the low temperature zone of the second electrical device are arranged adjacent to each other, and the low temperature zone of the first electrical device and the high temperature zone of the second electrical device are arranged adjacent to each other.

[0016] In some embodiments, the bottom of the partition is basically opposite to the center line of the high temperature zone of the first electrical device close to the bottom wall of the accommodating cavity, and the top of the partition is basically opposite to the edge of the top wall of the third electrical device and the fourth electrical device away from the accommodating cavity.

[0017] In some embodiments, the electrical box also includes a first radiator and a second radiator disposed in the accommodating cavity, the first electrical component and the third electrical component are arranged opposite to each other, the second electrical component and the fourth electrical component are arranged opposite to each other, the first radiator is disposed between the first electrical component and the third electrical component, and the second radiator is disposed between the second electrical component and the bottom wall of the accommodating cavity.

[0018] In some embodiments, the first radiator and the second radiator are constructed so that the airflow blown out of the first radiator flows toward the first electrical device and reaches the return air outlet of the second radiator, and the airflow blown out of the second radiator flows toward the second electrical device, then flows through the fourth electrical device and the third electrical device and reaches the return air outlet of the first radiator.

[0019] In some embodiments, the air outlet of the first heat sink is arranged obliquely relative to the edge of the first electrical device, so that the air outlet of the first heat sink faces the second heat sink.

[0020] In some embodiments, the angle between the plane where the air outlet of the first heat sink is located and the edge line of the first electrical component close to the third electrical component is 35° to 45°.

[0021] In some embodiments, there is a preset gap between the second heat sink and the bottom wall of the accommodating cavity, and the side of the second heat sink away from the first heat sink is inclined toward the bottom wall of the accommodating cavity, so that the outlet of the second heat sink is toward the second electrical device and the area between the fourth electrical device and the side wall of the accommodating cavity.

[0022] In some embodiments, the angle between the plane where the air outlet of the second heat sink is located and the edge line of the second electrical device close to the bottom wall of the accommodating cavity is 5° to 10°.

[0023] In some embodiments, the first electrical device, the second electrical device, the third electrical device and the fourth electrical device are all arranged in the first cavity, and in the direction perpendicular to the partition, the distance between the wall of the first cavity opposite to the partition and the partition, the height of the first radiator and the height of the second radiator are basically equal.

[0024] In some embodiments, a third through hole is disposed on the partition, and the top surface of the first heat sink is exposed from the third through hole.

[0025] In some embodiments, the electrical box also includes a control device, which is connected to the first radiator signal, the first radiator has a first turn-on temperature and a first turn-off temperature, the control device is configured to control the first radiator to turn on when the ambient temperature is greater than or equal to the first turn-on temperature, and to control the first radiator to turn off when the ambient temperature is less than or equal to the first turn-off temperature, wherein the first turn-on temperature is greater than the first turn-off temperature; and / or, the control device is connected to the second radiator signal, the second radiator has a second turn-on temperature and a second turn-off temperature, the control device is configured to control the second radiator to turn on when the ambient temperature is greater than or equal to the second turn-on temperature, and to control the second radiator to turn off when the ambient temperature is less than or equal to the second turn-off temperature, wherein the second turn-on temperature is greater than the second turn-off temperature.

[0026] In some embodiments, the first opening temperature is 2° C. to 5° C. greater than the first closing temperature; and / or the second opening temperature is 2° C. to 5° C. greater than the second closing temperature.

[0027] According to a second aspect of the utility model, an air conditioning unit is provided, comprising the above-mentioned electrical appliance box.

[0028] Based on the above technical solution, the embodiment of the utility model can separate the accommodating chamber into a first chamber and a second chamber by setting a partition, and by setting a first connecting part and a second connecting part, the airflow can circulate in the first chamber and the second chamber, so that the high temperature zone and the low temperature zone can exchange heat, thereby avoiding the local temperature inside the box body from being too high, and achieving the effect of balancing the temperature inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0030] Figure 1 The present invention provides an internal structure diagram of an electrical box according to an embodiment of the present invention.

[0031] Figure 2 The present invention provides a schematic diagram of the arrangement structure of the partition in one embodiment of the electrical box.

[0032] Figure 3 A side view of the internal structure of an electrical appliance box according to an embodiment of the present invention.

[0033] Figure 4 A schematic diagram of airflow circulating in a first cavity and a second cavity in one embodiment of an electrical box provided by the utility model.

[0034] Figure 5 A schematic diagram of the heating areas of various electrical components in an embodiment of the electrical appliance box provided by the utility model.

[0035] Figure 6 A schematic diagram of gas flow in the first cavity of an electrical box according to an embodiment of the present invention.

[0036] Figure 7 This is a schematic structural diagram of a partition in an embodiment of an electrical appliance box provided by the utility model.

[0037] In the figure:

[0038] 1. Box body; 11. Accommodating cavity; 12. First cavity; 13. Second cavity; 14. First connecting part; 15. Second connecting part; 2. Electrical component; 21. First electrical component; 22. Second electrical component; 23. Third electrical component; 24. Fourth electrical component; 25. Fifth electrical component; 26. Sixth electrical component; 3. Partition; 31. Top; 32. Bottom; 33. Third through hole; 4. First radiator; 5. Second radiator. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0041] refer to Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments of the electrical box provided by the utility model, the electrical box includes a box body 1, multiple electrical components 2 and a partition 3, a accommodating chamber 11 is provided in the box body 1, multiple electrical components 2 are arranged in the accommodating chamber 11, the partition 3 is arranged in the accommodating chamber 11, the partition 3 is configured to separate the accommodating chamber 11 into a first chamber 12 and a second chamber 13, when the electrical box is in a working state, the temperature in the first chamber 12 is different from the temperature in the second chamber 13, a first connecting portion 14 connecting the first chamber 12 and the second chamber 13 is provided at a position near the top wall of the accommodating chamber 11 in the accommodating chamber 11, and a second connecting portion 15 connecting the first chamber 12 and the second chamber 13 is provided at a position near the bottom wall of the accommodating chamber 11 in the accommodating chamber 11, and the gas in the first chamber 12 and the gas in the second chamber 13 circulate through the first connecting portion 14 and the second connecting portion 15 for heat exchange.

[0042] In the embodiment provided by the utility model, by setting the partition 3, the accommodating chamber 11 can be divided into a first chamber 12 and a second chamber 13, and by setting the first connecting portion 14 and the second connecting portion 15, the air flow can be circulated in the first chamber 12 and the second chamber 13, so that the high temperature zone and the low temperature zone can exchange heat, thereby avoiding the local temperature inside the box body 1 from being too high, and achieving the effect of balancing the temperature inside the box body 1.

[0043] Specifically, if Figure 4As shown, the first connecting portion 14 is arranged in the accommodating chamber 11 at a position close to the top wall of the accommodating chamber 11, and the second connecting portion 15 is arranged in the accommodating chamber 11 at a position close to the bottom wall of the accommodating chamber 11. Therefore, when the temperature in the first chamber 12 is greater than the temperature in the second chamber 13, the hot air flow in the first chamber 12 rises and enters the second chamber 13 through the first connecting portion 14, and exchanges heat with the cold air flow in the second chamber 13. After the heat exchange is completed, the cooling air flow sinks and then returns to the first chamber 12 through the second connecting portion 15, which can cool down the high temperature area in the first chamber 12, thereby achieving the effect of reducing the local high temperature in the first chamber 12. Then, the air flow continues to rise after being heated, and circulates in the first chamber 12 and the second chamber 13, thereby achieving the effect of using the low-temperature air flow in the second chamber 13 to cool down the high temperature area in the first chamber 12.

[0044] When the temperature in the second cavity 13 is higher than that in the first cavity 12, the airflow path is just the opposite. The hot airflow in the second cavity 13 rises and enters the first cavity 12 through the first connecting portion 14 to exchange heat with the cold airflow in the first cavity 12. After the heat exchange is completed, the cooling airflow sinks and then returns to the second cavity 13 through the second connecting portion 15, which can cool down the high-temperature area in the second cavity 13, thereby reducing the local high temperature in the second cavity 13. Then, the airflow continues to rise after being heated, and circulates in the first cavity 12 and the second cavity 13, thereby achieving the effect of using the low-temperature airflow in the first cavity 12 to cool down the high-temperature area in the second cavity 13.

[0045] The embodiment of the utility model allows the airflow to form a natural circulation flow between the first cavity 12 and the second cavity 13 through the first connecting portion 14 and the second connecting portion 15, without relying on the drive of airflow driving components such as fans, thereby reducing energy consumption and achieving the purpose of energy saving and environmental protection.

[0046] In an embodiment of the utility model, the temperature in the first cavity 12 and the temperature in the second cavity 13 when the electrical box is in working state can be measured by a thermometer, and the temperature in the first cavity 12 and the temperature in the second cavity 13 can be measured again after the electrical box has been working for a period of time and has basically stabilized.

[0047] The temperature in the first cavity 12 and the temperature in the second cavity 13 may be the real-time temperature or the average temperature over a period of time. In addition, when the temperature distribution in the first cavity 12 and the second cavity 13 is uneven, the temperature in the first cavity 12 and the temperature in the second cavity 13 may be the average temperature of a plurality of different positions in the corresponding cavity, and of course, the embodiment of using the local temperature as the temperature in the first cavity 12 and the temperature in the second cavity 13 is not excluded. In general, the difference between the temperature in the first cavity 12 and the temperature in the second cavity 13 is the driving force for the airflow in the first cavity 12 and the airflow in the second cavity 13 to form a circulating flow, and the driving force may also be the pressure or other driving force that causes the airflow to flow between the first cavity 12 and the second cavity 13.

[0048] In some embodiments, there is a first gap between the top 31 of the partition 3 and the top wall of the accommodating cavity 11, and the first gap forms a first connecting portion 14; and / or, there is a second gap between the bottom 32 of the partition 3 and the bottom wall of the accommodating cavity 11, and the second gap forms a second connecting portion 15.

[0049] By providing the first gap and the second gap, the first connecting portion 14 and the second connecting portion 15 can be formed, so that the airflow can circulate in the first cavity 12 and the second cavity 13 .

[0050] In this embodiment, the top 31 and the bottom 32 of the partition 3 are not directly connected to the wall of the accommodating chamber 11, and the two sides of the partition 3 are respectively connected to the side walls of the accommodating chamber 11; alternatively, the partition 3 can be connected to the front and rear side walls of the accommodating chamber 11 through a supporting structure.

[0051] In some embodiments, the partition 3 is connected to the top wall of the accommodating chamber 11, and a first through hole is provided at a position of the partition 3 near the top wall of the accommodating chamber 11, and the first through hole forms a first connecting portion 14; and / or, the partition 3 is connected to the bottom wall of the accommodating chamber 11, and a second through hole is provided at a position of the partition 3 near the bottom wall of the accommodating chamber 11, and the second through hole forms a second connecting portion 15.

[0052] By providing the first through hole and the second through hole on the partition 3 , the first connecting portion 14 and the second connecting portion 15 can be formed, and the connection between the partition 3 and the box body 1 can be facilitated.

[0053] There are many options for separating the first cavity 12 and the second cavity 13 , and the distribution of the plurality of electrical devices 2 in the first cavity 12 and the second cavity 13 can be relatively flexible and can be determined according to actual needs.

[0054] For example, in some embodiments, the temperature in the first cavity 12 is greater than the temperature in the second cavity 13 , and the plurality of electrical devices 2 are disposed in the first cavity 12 .

[0055] In other embodiments, electrical devices 2 are disposed in both the first cavity 12 and the second cavity 13, wherein the total heat generation of the electrical devices 2 disposed in the first cavity 12 is greater than the total heat generation of the electrical devices 2 disposed in the second cavity 13, or the total heat generation of the electrical devices 2 disposed in the second cavity 13 is greater than the total heat generation of the electrical devices 2 disposed in the first cavity 12.

[0056] In some embodiments, the plurality of electrical devices 2 include a first electrical device 21, a second electrical device 22, a third electrical device 23 and a fourth electrical device 24 arranged in the first cavity 12, the heat generated by the first electrical device 21 and the heat generated by the second electrical device 22 are both greater than the heat generated by the third electrical device 23, and the heat generated by the first electrical device 21 and the heat generated by the second electrical device 22 are both greater than the heat generated by the fourth electrical device 24, the first electrical device 21 and the second electrical device 22 are arranged side by side near the bottom wall of the accommodating cavity 11, and the distance between the second electrical device 22 and the bottom wall of the accommodating cavity 11 is greater than the distance between the first electrical device 21 and the bottom wall of the accommodating cavity 11, and the third electrical device 23 and the fourth electrical device 24 are arranged side by side near the top wall of the accommodating cavity 11.

[0057] In some embodiments, the first electrical device 21 and the second electrical device 22 have the same structure, and the arrangement directions of the first electrical device 21 and the second electrical device 22 differ by 180°.

[0058] like Figure 1 and Figure 2 As shown, the structures of the first electrical device 21 and the second electrical device 22 are exactly the same, but their arrangement orientations in the first cavity 12 are different. The arrangement directions of the first electrical device 21 and the second electrical device 22 differ by 180°, that is, after the first electrical device 21 rotates 180° around its own center, the arrangement direction is exactly the same as that of the second electrical device 22.

[0059] like Figure 5 As shown, the first electrical device 21 includes a heating zone 1, a heating zone 2, a heating zone 3 and a heating zone 4, and the structure of the second electrical device 22 is the same as that of the first electrical device 21, including a heating zone 5 corresponding to the heating zone 1, a heating zone 6 corresponding to the heating zone 2, a heating zone 7 corresponding to the heating zone 3 and a heating zone 8 corresponding to the heating zone 4. When arranged, the heating zone 4 of the first electrical device 21 is arranged at a position close to the bottom wall of the accommodating cavity 11, and the heating zones 1 and 2 are arranged at positions away from the bottom wall of the accommodating cavity 11; while the heating zone 8 of the second electrical device 22 corresponding to the heating zone 4 of the first electrical device 21 is arranged at a position away from the bottom wall of the accommodating cavity 11, and the heating zone 5 of the second electrical device 22 corresponding to the heating zone 1 of the first electrical device 21 and the heating zone 6 corresponding to the heating zone 2 of the first electrical device 21 are arranged at a position close to the bottom wall of the accommodating cavity 11.

[0060] By setting the arrangement directions of the first electrical device 21 and the second electrical device 22 to be 180° apart, it is possible to avoid the high temperature zone of the first electrical device 21 being too close to the high temperature zone of the second electrical device 22, so that the high temperature zone of the first electrical device 21 and the low temperature zone of the second electrical device 22 are arranged adjacent to each other, and the low temperature zone of the first electrical device 21 and the high temperature zone of the second electrical device 22 are arranged adjacent to each other, thereby achieving the purpose of temperature balance and preventing local excessive temperature.

[0061] In some embodiments, the bottom 32 of the partition 3 is basically opposite to the center line of the high temperature zone of the bottom wall of the first electrical device 21 close to the accommodating cavity 11, and the top 31 of the partition 3 is basically opposite to the edge of the top wall of the third electrical device 23 and the fourth electrical device 24 away from the accommodating cavity 11.

[0062] Since the heat generated by the first electrical device 21 and the heat generated by the second electrical device 22 are both greater than the heat generated by the third electrical device 23, and the heat generated by the first electrical device 21 and the heat generated by the second electrical device 22 are both greater than the heat generated by the fourth electrical device 24, the above arrangement of the partition 3 can at least separate the first electrical device 21 and the second electrical device 22 with larger heat generation in the same chamber, which is convenient for separating the accommodating chamber 11 into a high temperature zone and a low temperature zone, thereby facilitating the heat exchange of the subsequent airflow in the circulation flow. At the same time, the above arrangement of the partition 3 is also conducive to the formation of the airflow as follows Figure 6 The circulating flow shown, combined with the setting positions of the first radiator 4 and the second radiator 5 described below, and the arrangement of the partition 3 can make the cooling airflow flowing out of the air outlets of the first radiator 4 and the second radiator 5 flow more concentratedly to the target heat dissipation area, avoiding airflow dispersion and reducing the cooling effect.

[0063] In some embodiments, the electrical box also includes a first radiator 4 and a second radiator 5 arranged in the accommodating cavity 11, the first electrical component 21 and the third electrical component 23 are arranged opposite to each other, the second electrical component 22 and the fourth electrical component 24 are arranged opposite to each other, the first radiator 4 is arranged between the first electrical component 21 and the third electrical component 23, and the second radiator 5 is arranged between the second electrical component 22 and the bottom wall of the accommodating cavity 11.

[0064] By providing the first heat sink 4 and the second heat sink 5 , the accommodating cavity 11 can be actively cooled, thereby reducing the overall temperature in the accommodating cavity 11 and effectively protecting the electrical device 2 .

[0065] like Figure 6 As shown, in some embodiments, the first radiator 4 and the second radiator 5 are constructed so that the airflow blown out of the first radiator 4 flows to the first electrical device 21 and reaches the return air outlet of the second radiator 5, and the airflow blown out of the second radiator 5 flows to the second electrical device 22, and then flows through the fourth electrical device 24 and the third electrical device 23 and reaches the return air outlet of the first radiator 4.

[0066] By constructing the first radiator 4 so that the airflow blown out by the first radiator 4 flows toward the first electrical device 21 and reaches the return air outlet of the second radiator 5, the first electrical device 21 can be centrally cooled by the first radiator 4, and the cooled airflow can reach the return air outlet of the second radiator 5 and be sucked away by the return air outlet of the second radiator 5, thereby achieving the purpose of airflow circulation.

[0067] By constructing the second radiator 5 so that the airflow blown out by the second radiator 5 flows to the second electrical device 22, then flows through the fourth electrical device 24 and the third electrical device 23 and reaches the return air outlet of the first radiator 4, the second electrical device 22 can be centrally cooled by the second radiator 5, and the cooled airflow can continue to cool the fourth electrical device 24 and the third electrical device 23, and finally reach the return air outlet of the first radiator 4 and be sucked away by the return air outlet of the first radiator 4, thereby achieving the purpose of airflow circulation.

[0068] In some embodiments, the air outlet of the first heat sink 4 is arranged obliquely relative to the edge of the first electrical device 21 , so that the air outlet of the first heat sink 4 faces the second heat sink 5 .

[0069] By setting the air outlet of the first radiator 4 to be inclined relative to the edge of the first electrical device 21, the air outlet of the first radiator 4 can be directed toward the second radiator 5, so that the airflow blown out by the first radiator 4 can be sucked into the return air port of the second radiator 5 after cooling the first electrical device 21, so as to realize the circulation of the airflow and avoid the airflow being unable to circulate forward due to the dissipation of energy.

[0070] In some embodiments, the angle between the plane where the air outlet of the first heat sink 4 is located and the edge line of the first electrical device 21 close to the third electrical device 23 is 35° to 45°, such as 35°, 40° or 45°.

[0071] Setting the angle between the plane where the air outlet of the first radiator 4 is located and the edge line of the first electrical device 21 close to the third electrical device 23 within the range of 35° to 45° can ensure that most of the airflow at the outlet of the first radiator 4 can flow in the direction of the first electrical device 21 and the second radiator 5.

[0072] In some embodiments, there is a preset gap between the second heat sink 5 and the bottom wall of the accommodating cavity 11, and the side of the second heat sink 5 away from the first heat sink 4 is inclined toward the bottom wall of the accommodating cavity 11, so that the outlet of the second heat sink 5 is toward the area between the second electrical device 22 and the fourth electrical device 24 and the side wall of the accommodating cavity 11.

[0073] By setting the side of the second radiator 5 away from the first radiator 4 to be inclined toward the bottom wall of the accommodating cavity 11, the outlet of the second radiator 5 can be directed toward the second electrical component 22 and the area between the fourth electrical component 24 and the side wall of the accommodating cavity 11, so that the airflow blown out by the second radiator 5 can cool the second electrical component 22, and can continue to flow forward to cool the area between the fourth electrical component 24 and the side wall of the accommodating cavity 11, and finally flow through the fourth electrical component 24 and the third electrical component 23 to reach the return air outlet of the first radiator 4.

[0074] In some embodiments, the angle between the plane where the air outlet of the second heat sink 5 is located and the edge line of the second electrical device 22 close to the bottom wall of the accommodating cavity 11 is 5° to 10°, such as 5°, 7°, 8° or 10°.

[0075] The angle between the plane where the air outlet of the second radiator 5 is located and the edge line of the second electrical component 22 close to the bottom wall of the accommodating cavity 11 is set within the range of 5° to 10°, so that most of the airflow blown out from the second radiator 5 flows to the area between the second electrical component 22 and the fourth electrical component 24 and the side wall of the accommodating cavity 11, and the distance between the second radiator 5 and the bottom wall of the accommodating cavity 11 is prevented from being too small, thereby affecting the circulation of airflow.

[0076] In some embodiments, the first electrical device 21, the second electrical device 22, the third electrical device 23 and the fourth electrical device 24 are all arranged in the first cavity 12, and in the direction perpendicular to the partition 3, the distance between the wall of the first cavity 12 opposite to the partition 3 and the partition 3, the height of the first radiator 4 and the height of the second radiator 5 are basically equal.

[0077] By setting the position of the partition 3 so that the distance between the wall of the first cavity 12 opposite to the partition 3 and the partition 3 is substantially equal to the height of the first radiator 4 and the height of the second radiator 5, the air outlet area of ​​the first radiator 4 and the second radiator 5 can be utilized to the maximum extent, avoiding the reduction of the air outlet area of ​​the first radiator 4 and the second radiator 5 due to the distance between the wall of the first cavity 12 opposite to the partition 3 and the partition 3 being too small; it can also avoid the formation of a gap between the partition 3 and the top of the first radiator 4, which affects the circulation path of the airflow in the first cavity 12.

[0078] like Figure 7 As shown, in some embodiments, the partition plate 3 is provided with a third through hole 33 , and the top surface of the first heat sink 4 is exposed from the third through hole 33 .

[0079] By providing the third through hole 33 , interference between the partition plate 3 and the first radiator 4 can be effectively avoided, thereby facilitating installation of the partition plate 3 .

[0080] In some embodiments, the electrical box also includes a control device, which is signal-connected to the first radiator 4, the first radiator 4 has a first turn-on temperature and a first turn-off temperature, the control device is configured to control the first radiator 4 to turn on when the ambient temperature is greater than or equal to the first turn-on temperature, and to control the first radiator 4 to turn off when the ambient temperature is less than or equal to the first turn-off temperature, wherein the first turn-on temperature is greater than the first turn-off temperature; and / or, the control device is signal-connected to the second radiator 5, the second radiator 5 has a second turn-on temperature and a second turn-off temperature, the control device is configured to control the second radiator 5 to turn on when the ambient temperature is greater than or equal to the second turn-on temperature, and to control the second radiator 5 to turn off when the ambient temperature is less than or equal to the second turn-off temperature, wherein the second turn-on temperature is greater than the second turn-off temperature.

[0081] By setting the first opening temperature to be greater than the first closing temperature, and setting the second opening temperature to be greater than the second closing temperature, frequent opening and closing of the first radiator 4 and the second radiator 5 can be avoided, which is beneficial to improving the service life of the first radiator 4 and the second radiator 5.

[0082] In some embodiments, the first opening temperature is 2° C. to 5° C. greater than the first closing temperature; and / or the second opening temperature is 2° C. to 5° C. greater than the second closing temperature.

[0083] Setting the temperature difference between the first opening temperature and the first closing temperature within the range of 2°C to 5°C, and setting the temperature difference between the second opening temperature and the second closing temperature within the range of 2°C to 5°C, can not only avoid the first radiator 4 and the second radiator 5 from being frequently opened and closed, but also avoid the first radiator 4 and the second radiator 5 from being unable to be opened or closed in time, affecting the control effect of the temperature in the box body 1.

[0084] The first radiator 4 and the second radiator 5 can be fans or blowers.

[0085] The following is combined with Figures 1 to 7 The structure and cooling principle of an embodiment of the electrical box provided by the utility model are described as follows:

[0086] like Figure 1 As shown, the electrical box includes a box body 1, the box body 1 has a receiving cavity 11 inside, and a plurality of electrical components 2 are arranged in the receiving cavity 11. The plurality of electrical components 2 include a first electrical component 21, a second electrical component 22, a third electrical component 23, a fourth electrical component 24, a fifth electrical component 25 and a sixth electrical component 26.

[0087] In this embodiment, the first electrical component 21 and the second electrical component 22 are circuit boards with the same structure, and the third electrical component 23 and the fourth electrical component 24 are also circuit boards, but the structures of the third electrical component 23 and the fourth electrical component 24 are different from those of the first electrical component 21 and the second electrical component 22. The heat source on the circuit board is mainly a common mode choke. The fifth electrical component 25 and the sixth electrical component 26 are both reactors. The first electrical component 21, the second electrical component 22, the third electrical component 23 and the fourth electrical component 24 are all square block structures.

[0088] The first electrical component 21 and the second electrical component 22 are arranged in parallel at a position close to the bottom wall of the accommodating cavity 11, and the first electrical component 21 and the second electrical component 22 are arranged in parallel with the partition 3, and the electrical connectors on the first electrical component 21 and the second electrical component 22 are installed on the side of the circuit board body close to the partition 3. The third electrical component 23 and the fourth electrical component 24 are arranged in parallel at a position close to the top wall of the accommodating cavity 11, and the third electrical component 23 and the fourth electrical component 24 are arranged in parallel with the partition 3, and the electrical connectors on the third electrical component 23 and the fourth electrical component 24 are installed on the side of the circuit board body close to the partition 3. The fifth electrical component 25 and the sixth electrical component 26 are arranged on both sides of the third electrical component 23 and the fourth electrical component 24, respectively. The third electrical component 23 and the fourth electrical component 24 are located between the fifth electrical component 25 and the sixth electrical component 26. The first electrical component 21 and the third electrical component 23 are basically opposite, and the second electrical component 22 is arranged opposite to the fourth electrical component 24 and the sixth electrical component 26. A vacant area is provided on the side of the first electrical component 21 away from the second electrical component 22.

[0089] The upper edges and lower edges of the third electrical component 23 and the fourth electrical component 24 are both arranged flush, and the upper edges and lower edges of the third electrical component 23 and the fourth electrical component 24 are both parallel to the top wall of the accommodating cavity 11 .

[0090] The first electrical device 21 and the second electrical device 22 are arranged in a vertically staggered manner, and the distance between the first electrical device 21 and the bottom wall of the accommodation cavity 11 is smaller than the distance between the second electrical device 22 and the bottom wall of the accommodation cavity 11. Moreover, the arrangement directions of the first electrical device 21 and the second electrical device 22 differ by 180°, and the arrangement state of the first electrical device 21 after rotating 180° is the same as that of the second electrical device 22. The upper edges and lower edges of the first electrical device 21 and the second electrical device 22 are both parallel to the bottom wall of the accommodation cavity 11.

[0091] The first heat sink 4 is disposed between the first electrical component 21 and the third electrical component 23 , and the second heat sink 5 is disposed between the second electrical component 22 and the bottom wall of the accommodation cavity 11 .

[0092] One end of the first radiator 4 contacts the upper edge of the first electrical device 21, and the other end is inclined toward the direction close to the third electrical device 23. The air outlet of the first radiator 4 is generally toward the second radiator 5, but cannot be directly opposite to the second radiator 5. The angle between the plane where the air outlet of the first radiator 4 is located and the upper edge of the first electrical device 21 is 40°. Such a position facilitates the first radiator 4 to preferentially dissipate heat to the key components on the first electrical device 21. At the same time, the exhaust airflow behind the first radiator 4 can also take into account the third electrical device 23 and the fifth electrical device 25. One end of the second radiator 5 contacts the lower edge of the second electrical device 22, and the other end is inclined toward the direction close to the bottom wall of the accommodating cavity 11. The angle between the plane where the air outlet of the second radiator 5 is located and the lower edge of the second electrical device 22 is 5° to 10°. The air outlet surface of the second radiator 5 faces the busbar capacitor of the second electrical device 22 (i.e. Figure 5 The heating area 5 shown in the figure can also take into account the sixth electrical device 26, the fourth electrical device 24 and the third electrical device 23.

[0093] like Figure 2 As shown, the top 31 of the partition 3 extends upward and just exceeds the lower edges of the third electrical component 23 and the fourth electrical component 24, and the bottom 32 of the partition 3 is basically flush with the center line of the common mode choke of the heating zone arranged on the bottom wall of the accommodating cavity 11 on the first electrical component 21, leaving sufficient space for the circulation of airflow in the first cavity 12 and the second cavity 13.

[0094] like Figure 3 As shown, the electrical box is placed vertically, and the partition 3 divides the accommodating chamber 11 into a first chamber 12 located on the right and a second chamber 13 located on the left. A first connecting portion 14 is formed above the partition 3, and a second connecting portion 15 is formed below the partition 3.

[0095] The first electrical device 21 , the second electrical device 22 , the third electrical device 23 , the fourth electrical device 24 , the fifth electrical device 25 , the sixth electrical device 26 , the first heat sink 4 and the second heat sink 5 are all arranged in the first cavity 12 , and a small number of electrical control components with very little heat generation can be arranged in the second cavity 13 .

[0096] A first mounting plate (such as a sheet metal part) is provided in the box body 1 for supporting the first electrical component 21 and the second electrical component 22, and the second heat sink 5 can be installed on the first mounting plate. A second mounting plate is also provided in the box body 1 for supporting the third electrical component 23, the fourth electrical component 24, the fifth electrical component 25 and the sixth electrical component 26. The distances between the first mounting plate and the second mounting plate and the wall of the accommodating cavity 11 can be different.

[0097] The first radiator 4 and the second radiator 5 have an opening temperature and a closing temperature respectively. When the external environment temperature measured by the temperature sensing package is higher than the opening temperature, the radiator is controlled to open; when the external environment temperature measured by the temperature sensing package is lower than the closing temperature, the radiator is controlled to close. Setting the opening temperature to be 2 to 5°C higher than the closing temperature can prevent the radiator from being frequently opened and closed.

[0098] like Figure 4 As shown, when the first radiator 4 and the second radiator 5 are both stopped and not in operation, the airflow path in the electrical box is: due to the rising characteristics of hot air flow, the heat flow generated by each heat source in the first cavity 12 rises, and then turns over the baffle along the first connecting portion 14 on the upper side of the baffle 3, and cools in the second cavity 13. After cooling, the cold air flow sinks, and turns over the baffle along the second connecting portion 15 at the lower edge of the baffle 3 to the first cavity 12, dissipating heat for the heating element in the first cavity 12, and absorbing heat to become hot air flow and rise again, thereby forming a natural circulation airflow field in the two cavities inside the electrical box, suppressing local heating. This natural circulation method can reduce the use loss of the radiator, increase the service life of the radiator, and improve the reliability of the electrical box.

[0099] like Figure 5 As shown, the heat sources on the first electrical device 21 and the second electrical device 22 are widely distributed, but the temperature rise priority of the devices therein is the highest in the entire electrical box because they control the operation of the key components of the air-conditioning unit. The temperature rise priority of the common mode choke on the third electrical device 23 and the fourth electrical device 24 ranks second. The fifth electrical device 25 and the sixth electrical device 26 have the third priority because of their higher temperature resistance. According to the priority, the first radiator 4 and the second radiator 5 give priority to dissipating heat for the first electrical device 21 and the second electrical device 22, but at the same time, the heat dissipation requirements of the third electrical device 23, the fourth electrical device 24, the fifth electrical device 25 and the sixth electrical device 26 must be met.

[0100] The first electrical device 21 and the second electrical device 22 have the same structure, and both mainly include four heating zones. The first electrical device 21 is provided with heating zones 1, 2, 3 and 4, and the second electrical device 22 is provided with heating zones 5, 6, 7 and 8. The third electrical device 23 is heating zone 9, the fourth electrical device 24 is heating zone 10, the fifth electrical device 25 is heating zone 11, and the sixth electrical device is heating zone 12.

[0101] Among them, when the electrical box is in working state, the temperature of heating zone 1 and heating zone 2 is higher than the temperature of heating zone 3, and the temperature of heating zone 3 is higher than the temperature of heating zone 4; the temperature of heating zone 5 and heating zone 6 is higher than the temperature of heating zone 7, and the temperature of heating zone 7 is higher than the temperature of heating zone 8; the temperature of heating zones 1-8 is higher than the temperature of heating zones 9 and 10; the temperature of heating zones 9 and 10 is higher than the temperature of heating zones 11 and 12. Therefore, the priority order of cooling is that heating zone 1 and heating zone 2 are prior to heating zone 3, and heating zone 3 is prior to heating zone 4; heating zone 5 and heating zone 6 are prior to heating zone 7, and heating zone 7 is prior to heating zone 8; heating zones 1-8 are prior to heating zones 9 and 10; heating zones 9 and 10 are prior to heating zones 11 and 12.

[0102] When the first radiator 4 and the second radiator 5 operate normally, the wind field in the electrical box is as follows: Figure 6 As shown, the second radiator 5 blows air upward and rotates 5 degrees relative to the lower edge of the second electrical device 22. After rotating 5 degrees, the air outlet of the second radiator 5 can be better aligned with the heating area 5 on the second electrical device 22, and at the same time, a certain exhaust space can be provided for the rear of the second radiator 5 to ensure the wind strength of the second radiator 5. The second radiator 5 can effectively dissipate heat for almost all the heating components on the second electrical device 22. When the air flows upward, it is blocked by the bus capacitor on the heating zone 8. The blocked airflow then flows in two different directions: about 50% of the airflow passes through the right side of the bus capacitor on the heating zone 8, and after passing through the bus capacitor, it passes through the sixth electrical device 26 with higher heat resistance, and continues to flow upward and leftward. Then the airflow is blocked by the choke on the heating zone 10 and blows through the choke from the upper and lower directions. The airflow that bypasses the choke on the heating zone 10 blows upward along the wall of the electrical box to the third electrical device 23 to dissipate heat for it and flows to the rear of the first radiator 4 to provide exhaust airflow for the first radiator 4. The other 50% or so of the airflow flows from the bus capacitor on the second electrical device 22 to the rear of the first radiator 4 to provide exhaust airflow for the first radiator 4. The air passes through the left and upper sides of the line capacitor, and blows upward and leftward through the choke of the third electrical component 23, effectively dissipating heat for it, and then flows to the rear of the first radiator 4, providing sufficient airflow for the first radiator 4; the first radiator 4 extracts the airflow and sends air forward, and the first radiator 4 is aimed at all the heating components on the first electrical component 21. After blowing through the heating areas of the first electrical component 21, the airflow is blocked by the lower boundary of the electrical box. A part of the airflow flows to the left to the bus capacitor (i.e., heating area 4) of the first electrical component 21, realizing effective heat dissipation of the bus capacitor, and the other part flows through the heating areas 2 and 3 to dissipate heat for it, and flows to the rear of the second radiator 5, providing the second radiator 5 with sufficient airflow extraction and air supply, ensuring the air outlet intensity of the second radiator 5. In this way, a circulating flow of airflow is formed to achieve the purpose of dissipating heat for all heating components.

[0103] Through the description of multiple embodiments of the electrical box of the utility model, it can be seen that the embodiment of the electrical box of the utility model adopts a partition layering design, and at the same time utilizes the distribution and priority design of the heat source to achieve a reduction in the return air temperature, while taking into account the heat dissipation requirements of all heat sources; when the ambient temperature is high, a radiator is used to perform strong convection circulation heat dissipation on the electrical components in the electrical box, and when the ambient temperature is low and the radiator is turned off, natural circulation heat dissipation is used to suppress local heating. The critical temperature controlled by the radiator is increased, the service life of the radiator is increased, and the reliability of the electrical box is improved. At the same time, the requirements for qualified temperature rise of all components under all working conditions are met. Compared with the solution of setting an evaporator and a microchannel heat exchanger, the cost can be controlled.

[0104] Based on the above-mentioned electrical appliance box, the utility model also provides an air-conditioning unit, which includes the above-mentioned electrical appliance box.

[0105] The positive technical effects of the electrical box in the above-mentioned embodiments are also applicable to the air-conditioning unit and will not be described in detail here.

[0106] In addition to air-conditioning units, the electrical appliance box provided in the embodiment of the utility model can also be used on other electrical appliances that require an electrical appliance box, which will not be described in detail here.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that without departing from the principle of the utility model, the specific implementation method of the utility model can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the utility model.

Claims

1. An electrical box, characterized in that: include: A box body (1), wherein a receiving cavity (11) is provided in the box body (1); A plurality of electrical components (2) are arranged in the accommodating cavity (11); and A partition (3) is arranged in the accommodating chamber (11), and the partition (3) is configured to separate the accommodating chamber (11) into a first chamber (12) and a second chamber (13). When the electrical box is in a working state, the temperature in the first chamber (12) is different from the temperature in the second chamber (13). A first connecting portion (14) connecting the first chamber (12) and the second chamber (13) is provided at a position close to the top wall of the accommodating chamber (11) in the accommodating chamber (11), and a second connecting portion (15) connecting the first chamber (12) and the second chamber (13) is provided at a position close to the bottom wall of the accommodating chamber (11). Gas in the first chamber (12) and gas in the second chamber (13) circulate through the first connecting portion (14) and the second connecting portion (15) to perform heat exchange.

2. The electrical box according to claim 1, characterized in that: There is a first gap between the top (31) of the partition (3) and the top wall of the accommodating chamber (11), and the first gap forms the first connecting portion (14); and / or there is a second gap between the bottom (32) of the partition (3) and the bottom wall of the accommodating chamber (11), and the second gap forms the second connecting portion (15).

3. The electrical box according to claim 1, characterized in that: The partition (3) is connected to the top wall of the accommodating chamber (11), and a first through hole is provided on the partition (3) near the top wall of the accommodating chamber (11), and the first through hole forms the first connecting portion (14); and / or the partition (3) is connected to the bottom wall of the accommodating chamber (11), and a second through hole is provided on the partition (3) near the bottom wall of the accommodating chamber (11), and the second through hole forms the second connecting portion (15).

4. The electrical box according to claim 1, characterized in that: The temperature in the first cavity (12) is greater than the temperature in the second cavity (13), and the plurality of electrical devices (2) are all arranged in the first cavity (12); or the total heat generated by the electrical devices (2) arranged in the first cavity (12) is greater than the total heat generated by the electrical devices (2) arranged in the second cavity (13).

5. The electrical box according to claim 1, characterized in that: The plurality of electrical devices (2) include a first electrical device (21), a second electrical device (22), a third electrical device (23) and a fourth electrical device (24) arranged in the first cavity (12); the heat generated by the first electrical device (21) and the heat generated by the second electrical device (22) are both greater than the heat generated by the third electrical device (23); and the heat generated by the first electrical device (21) and the heat generated by the second electrical device (22) are both greater than the heat generated by the fourth electrical device (24); the first electrical device (21) and the second electrical device (22) are arranged side by side at a position close to the bottom wall of the accommodating cavity (11); and the distance between the second electrical device (22) and the bottom wall of the accommodating cavity (11) is greater than the distance between the first electrical device (21) and the bottom wall of the accommodating cavity (11); and the third electrical device (23) and the fourth electrical device (24) are arranged side by side at a position close to the top wall of the accommodating cavity (11).

6. The electrical box according to claim 5, characterized in that: The first electrical device (21) and the second electrical device (22) have the same structure, and the arrangement directions of the first electrical device (21) and the second electrical device (22) differ by 180°, so that the high temperature zone of the first electrical device (21) and the low temperature zone of the second electrical device (22) are arranged adjacent to each other, and the low temperature zone of the first electrical device (21) and the high temperature zone of the second electrical device (22) are arranged adjacent to each other.

7. The electrical box according to claim 5, characterized in that: The bottom (32) of the partition (3) is basically arranged opposite to the center line of the high temperature zone of the first electrical component (21) close to the bottom wall of the accommodating cavity (11), and the top (31) of the partition (3) is basically arranged opposite to the edge of the top wall of the third electrical component (23) and the fourth electrical component (24) away from the accommodating cavity (11).

8. The electrical box according to claim 5, characterized in that: The invention also comprises a first heat sink (4) and a second heat sink (5) which are arranged in the accommodating cavity (11); the first electrical component (21) and the third electrical component (23) are arranged opposite to each other; the second electrical component (22) and the fourth electrical component (24) are arranged opposite to each other; the first heat sink (4) is arranged between the first electrical component (21) and the third electrical component (23); and the second heat sink (5) is arranged between the second electrical component (22) and the bottom wall of the accommodating cavity (11).

9. The electrical box according to claim 8, characterized in that: The first radiator (4) and the second radiator (5) are constructed so that the airflow blown out by the first radiator (4) flows toward the first electrical device (21) and reaches the return air outlet of the second radiator (5), and the airflow blown out by the second radiator (5) flows toward the second electrical device (22), then flows through the fourth electrical device (24) and the third electrical device (23) and reaches the return air outlet of the first radiator (4).

10. The electrical box according to claim 8, characterized in that: The air outlet of the first radiator (4) is arranged obliquely relative to the edge of the first electrical device (21), so that the air outlet of the first radiator (4) faces the second radiator (5).

11. The electrical box according to claim 8, characterized in that: The angle between the plane where the air outlet of the first radiator (4) is located and the edge line of the first electrical component (21) close to the third electrical component (23) is 35° to 45°.

12. The electrical box according to claim 8, characterized in that: A preset gap is provided between the second heat sink (5) and the bottom wall of the accommodating cavity (11), and a side of the second heat sink (5) away from the first heat sink (4) is inclined toward the bottom wall of the accommodating cavity (11), so that the outlet of the second heat sink (5) faces the area between the second electrical component (22) and the fourth electrical component (24) and the side wall of the accommodating cavity (11).

13. The electrical box according to claim 8, characterized in that: The angle between the plane where the air outlet of the second heat sink (5) is located and the edge line of the second electrical device (22) close to the bottom wall of the accommodating cavity (11) is 5° to 10°.

14. The electrical box according to claim 8, characterized in that: The first electrical component (21), the second electrical component (22), the third electrical component (23) and the fourth electrical component (24) are all arranged in the first cavity (12), and in a direction perpendicular to the partition (3), the distance between the wall of the first cavity (12) opposite to the partition (3) and the partition (3), the height of the first radiator (4) and the height of the second radiator (5) are substantially equal.

15. The electrical box according to claim 8, characterized in that: The partition plate (3) is provided with a third through hole (33), and the top surface of the first heat sink (4) is exposed from the third through hole (33).

16. The electrical box according to claim 8, characterized in that: The invention also comprises a control device, which is connected to the first radiator (4) by signal, the first radiator (4) having a first opening temperature and a first closing temperature, the control device being configured to control the first radiator (4) to open when the ambient temperature is greater than or equal to the first opening temperature, and to control the first radiator (4) to close when the ambient temperature is less than or equal to the first closing temperature, wherein the first opening temperature is greater than the first closing temperature; and / or, the control device is connected to the second radiator (5) by signal, the second radiator (5) having a second opening temperature and a second closing temperature, the control device being configured to control the second radiator (5) to open when the ambient temperature is greater than or equal to the second opening temperature, and to control the second radiator (5) to close when the ambient temperature is less than or equal to the second closing temperature, wherein the second opening temperature is greater than the second closing temperature.

17. The electrical box according to claim 16, characterized in that: The first opening temperature is 2° C. to 5° C. greater than the first closing temperature; and / or the second opening temperature is 2° C. to 5° C. greater than the second closing temperature.

18. An air conditioning unit, characterized in that: Comprising the electrical box as described in any one of claims 1 to 17.

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