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) and a plurality of electric parts, the box body (1) is internally provided with an accommodating cavity (11), the plurality of electric parts are arranged in the accommodating cavity (11), and the plurality of electric parts are arranged in the accommodating cavity (11) so as to simultaneously meet the preset requirements of the plurality of electric parts on heat dissipation and electromagnetic compatibility. The air conditioning unit comprises an electrical box. According to the utility model, when a plurality of electric devices in the box body are arranged, the preset requirements of the plurality of electric devices on heat dissipation and electromagnetic compatibility are considered at the same time, and the preset requirements of the electric devices on heat dissipation and electromagnetic compatibility can be met at the same time.

Description

Technical Field

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

[0002] At present, most of the layout of various electrical components inside the electrical box takes into account the heat dissipation requirements of high-temperature components. By setting up independent chambers to separate high-temperature and low-temperature areas or adding cooling fans, the heat dissipation effect inside the box is greatly improved, effectively reducing the damage to electrical components caused by high temperature and reducing the failure rate of electrical components. However, although the heat exchange requirements are taken into account, the requirements of electromagnetic compatibility are not taken into account. Some wiring inside the electrical box has crosstalk, and the electromagnetic interference between the strong and weak current modules is large, resulting in poor electromagnetic compatibility.

[0003] 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 an admission or any form of implication 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 utility model, and do not necessarily constitute the prior art. Utility Model Content

[0004] The embodiment of the utility model provides an electrical appliance box and an air conditioning unit, which can meet the heat dissipation requirements and electromagnetic compatibility requirements at the same time.

[0005] According to one aspect of the utility model, there is provided an electrical appliance box, comprising:

[0006] A box body, wherein a receiving cavity is provided inside the box body; and

[0007] A plurality of electrical components are disposed in the accommodating cavity, and the plurality of electrical components are arranged in the accommodating cavity to simultaneously meet the preset requirements of the plurality of electrical components for heat dissipation and electromagnetic compatibility.

[0008] In some embodiments, the electrical box also includes an inverter output line, the multiple electrical components include a first electrical component, the first electrical component includes a first mounting plate and multiple first sub-electrical components installed on the first mounting plate, the multiple first sub-electrical components include an inverter output terminal, a lead outlet is provided on the box body, the inverter output line is connected between the inverter output terminal and the lead outlet, and the inverter output terminal is arranged at a position close to the side of the first mounting plate opposite to the lead outlet.

[0009] In some embodiments, the lead outlet is arranged on the bottom wall of the accommodating cavity, and the inverter output line extends downward along the height direction of the box body.

[0010] In some embodiments, the multiple first sub-electrical devices include three rectifier input terminals and three inverter output terminals, the output directions of at least two of the three inverter output terminals are parallel, the input directions of the three rectifier input terminals are parallel, and the output directions of at least two inverter output terminals are perpendicular to the input directions of the three rectifier input terminals.

[0011] In some embodiments, the plurality of electrical components include a second electrical component. Among the plurality of electrical components, the second electrical component has the largest heat generation power, and the second electrical component is disposed at the top of the housing along the height direction of the box body.

[0012] In some embodiments, the electrical box also includes a first connecting line, multiple electrical components include a first electrical component, the first electrical component is arranged below the second electrical component along the height direction of the box body, the first electrical component includes a first mounting plate and multiple first sub-electrical components installed on the first mounting plate, the first sub-electrical component includes a first connecting terminal, the second electrical component includes a second mounting plate and multiple second sub-electrical components installed on the second mounting plate, the second sub-electrical component includes a second connecting terminal, the first connecting terminal is arranged at a position close to the side of the first mounting plate opposite to the second mounting plate, the second connecting terminal is arranged at a position close to the side of the second mounting plate opposite to the first mounting plate, and the first connecting line connects the first connecting terminal and the second connecting terminal.

[0013] In some embodiments, the multiple electrical devices include a first electrical device and a third electrical device. The first electrical device and the third electrical device are both arranged below the second electrical device in the height direction of the box body, and the third electrical device is located on the left side of the first electrical device and the second electrical device in the width direction of the box body, so that the lead-out wires and lead-in wires of the third electrical device do not intersect with the induced magnetic field formed by the first coil in the second electrical device.

[0014] In some embodiments, the multiple electrical components include a first electrical component and a third electrical component, the third electrical component and the first electrical component are arranged left and right along the width direction of the box body, the first electrical component includes a first mounting plate and a plurality of first sub-electrical components mounted on the first mounting plate, the third electrical component includes a third mounting plate and a plurality of third sub-electrical components mounted on the third mounting plate, the first mounting plate and the third mounting plate are both parallel to the first inner wall of the accommodating cavity, the first sub-electrical component is mounted on a side of the first mounting plate away from the first inner wall, and the third sub-electrical component is mounted on a side of the third mounting plate close to the first inner wall.

[0015] In some embodiments, the electrical box also includes a second connecting line, multiple third sub-electrical devices include a filter output terminal, multiple first sub-electrical devices include a rectifier input terminal, the second connecting line connects the filter output terminal and the rectifier input terminal, and the second connecting line extends in a horizontal direction.

[0016] In some embodiments, the electrical box also includes a third connecting wire, and multiple third sub-electrical components include a filter input terminal, which is arranged on the third mounting plate near its left side surface, and the bottom wall of the accommodating cavity is provided with a lead inlet, and the third connecting wire is connected between the lead inlet and the filter input terminal.

[0017] In some embodiments, the electrical box also includes a terminal block, which is installed on the outer wall of the box body. The terminal block includes a first connection port and a second connection port arranged front to back along the thickness direction of the box body. The third connecting wire passes through the lead inlet and is connected to the second connection port located on the rear side. The first connection port located on the front side is used to connect to a power source.

[0018] In some embodiments, the plurality of electrical components include a third electrical component and a fourth electrical component, and the third electrical component and the fourth electrical component are arranged front and back along a thickness direction of the box body.

[0019] In some embodiments, the third electrical device includes a third mounting board and a plurality of third sub-electrical devices mounted on the third mounting board, the fourth electrical device includes a fourth mounting board and a plurality of fourth sub-electrical devices mounted on the fourth mounting board, the third mounting board is connected to the fourth mounting board, the plurality of third sub-electrical devices are mounted on a side of the third mounting board away from the fourth mounting board, and the plurality of fourth sub-electrical devices are mounted on a side of the fourth mounting board away from the third mounting board.

[0020] In some embodiments, the electrical box also includes a first connecting plate, which is arranged between the third mounting plate and the fourth mounting plate to separate the connecting wires connected to the third electrical component and the connecting wires connected to the fourth electrical component, and the first connecting plate is made of a good conductor material.

[0021] In some embodiments, the electrical box also includes a first communication line and a second communication line, and the multiple electrical devices include a first electrical device and a fifth electrical device. The first communication line is connected to the fourth electrical device, and the fifth electrical device is arranged above the fourth electrical device along the height direction of the box body. The second communication line is connected to the fifth electrical device. The first communication line and the second communication line first extend upward to merge at the top wall of the accommodating cavity, and then extend to the right along the top wall of the accommodating cavity and extend downward along the right side wall of the accommodating cavity, and are connected to the lower part of the first electrical device close to the right side wall of the accommodating cavity. In the width direction of the box body, the first electrical device is arranged to the right side of the third electrical device and the fourth electrical device.

[0022] In some embodiments, the multiple electrical devices include a second electrical device, and the second electrical device is arranged above the first electrical device, the third electrical device and the fourth electrical device in the height direction of the box body. The first communication line and the second communication line both pass above the second electrical device, and the parts of the first communication line and the second communication line passing above the second electrical device are located in the middle position of the first coil in the second electrical device in the thickness direction of the box body.

[0023] In some embodiments, the electrical appliance box further includes a first electrical component and a radiator. The radiator is disposed in the accommodating cavity, and the radiator is located below the first electrical component in the height direction of the box body.

[0024] In some embodiments, the first electrical device includes a switching power supply component, and the air outlet of the heat sink faces the switching power supply component.

[0025] In some embodiments, in the height direction of the box body, the distance between the air inlet of the radiator and the bottom wall of the accommodating cavity is greater than 20 mm.

[0026] According to another aspect of the utility model, an air conditioning unit is provided, comprising the above-mentioned electrical appliance box.

[0027] Based on the above technical solution, when arranging multiple electrical components inside the box body 1, the embodiment of the utility model takes into account the preset requirements of multiple electrical components for heat dissipation and electromagnetic compatibility, and can simultaneously meet the preset requirements of electrical components for heat dissipation and electromagnetic compatibility, thereby helping to reduce the damage to electrical components caused by high temperature, reduce the failure rate of electrical components, and also help to improve the electromagnetic interference problem inside the electrical box. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. 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:

[0029] Figure 1 Schematic diagram of the internal structure of some embodiments of the electrical box provided by the utility model.

[0030] Figure 2 This is a schematic diagram of the internal structure of some embodiments of the electrical box provided by the utility model at another angle.

[0031] Figure 3 This is a schematic diagram of the internal structure of some embodiments of the electrical box provided by the utility model at another angle.

[0032] Figure 4 It is a partial structural schematic diagram of some embodiments of the electrical appliance box provided by the utility model.

[0033] Figure 5 It is a partial structural schematic diagram of some embodiments of the electrical appliance box provided by the utility model at another angle.

[0034] Figure 6 This is a partial structural schematic diagram of some embodiments of the electrical appliance box provided by the utility model at another angle.

[0035] Figure 7This is a schematic diagram of the structure of the wiring board in some embodiments of the electrical box provided by the utility model.

[0036] Figure 8 This is a schematic diagram of the internal structure and connection wires of some embodiments of the electrical box provided by the utility model.

[0037] Fig. 9 This is a schematic diagram of the partial structure and connection lines of some embodiments of the electrical box provided by the utility model.

[0038] Fig.10 This is a schematic diagram of the partial structure and connection lines of some embodiments of the electrical box provided by the utility model at another angle.

[0039] Fig.11 A schematic diagram of the partial structure and connection lines of some embodiments of the electrical box provided by the utility model at another angle.

[0040] Fig.12 A schematic diagram of the partial structure and connection wires of some embodiments of the electrical box provided by the utility model when the third electrical component is facing upward.

[0041] Fig.13 A schematic diagram of the inverter output voltage waveform in some embodiments of the electrical box provided by the utility model.

[0042] Fig.14 Schematic diagram of inverter output current waveform in some embodiments of the electrical box provided by the utility model.

[0043] Fig.15 A schematic diagram of grid-side current waveform in some embodiments of the electrical box provided by the utility model.

[0044] Fig.16 A schematic diagram of the reactor current waveform in some embodiments of the electrical box provided by the utility model.

[0045] In the figure:

[0046] 1. Box body; 11. Accommodating cavity; 12. Lead outlet; 13. Lead inlet; 2. First electrical component; 21. First mounting plate; 22. Inverter output terminal; 23. Rectifier input terminal; 24. First connecting terminal; 25. Third connecting terminal; 26. Switching power supply assembly; 3. Second electrical component; 31. Second mounting plate; 32. Second connecting terminal; 33. First coil; 4. Third electrical component; 41. Third mounting plate; 42. Filter output terminal; 43. Filter input Terminal; 44, second coil; 5, fourth electrical component; 51, fourth mounting plate; 52, fourth sub-electrical component; 6, fifth electrical component; 7, terminal block; 71, first connection port; 72, second connection port; 8, heat sink; 91, first connection plate; 92, second connection plate; 93, third connection plate; 101, inverter output line; 102, first connection line; 103, second connection line; 104, third connection line; 105, first communication line; 106, second communication line. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] Aiming at the problem of poor electromagnetic compatibility between electrical components inside an electrical box, the utility model improves the structure of the electrical box.

[0050] refer to Figures 1 to 12 As shown, in some embodiments of the electrical box provided by the utility model, the electrical box includes a box body 1 and a plurality of electrical components, a receiving cavity 11 is provided inside the box body 1, a plurality of electrical components are arranged in the receiving cavity 11, and the plurality of electrical components are arranged in the receiving cavity 11 to simultaneously meet the preset requirements of the plurality of electrical components for heat dissipation and electromagnetic compatibility.

[0051] The electrical box embodiment provided by the utility model takes into account the preset requirements of the multiple electrical components for heat dissipation and electromagnetic compatibility when arranging the multiple electrical components inside the box body 1, and can simultaneously meet the preset requirements of the electrical components for heat dissipation and the preset requirements for electromagnetic compatibility, thereby helping to reduce the damage to the electrical components caused by high temperature, reduce the failure rate of the electrical components, and also help to improve the electromagnetic interference problem inside the electrical box.

[0052] The specific arrangement of multiple electrical components in multiple embodiments of the electrical appliance box provided by the utility model will be introduced below.

[0053] like Fig.13 As shown in the figure, when the inverter performs PWM control, the output voltage waveform is a rectangular wave, and the three voltage platforms of the rectangular wave are the positive and negative bus voltages and zero; Fig.14 As shown in the figure, when the inverter performs PWM control, the output current waveform is approximately a sine wave, but the sine current wave contains step ripples of the switching frequency. This distorted electric field and distorted current will introduce a large frequency range of conducted interference noise and spatial electromagnetic radiation into the circuit. Therefore, an EMI filter is generally added before rectification to suppress high-frequency interference in the internal circuit and prevent external interference from entering the system.

[0054] In addition, if Fig.15 As shown, the grid-side current carried by the power cable contains high-frequency harmonics. According to the geometric shape of the power cable, the time-varying line current can be equivalent to a straight line or a circular antenna, thereby emitting electric dipole or magnetic dipole radiation. At this time, if the distance between different power cables is close in space, the radiation fields will be superimposed, coupled, and mixed with each other, which is the crosstalk between the lines.

[0055] According to the above analysis, the inverter output line is one of the main interference sources inside the electrical box. In order to avoid crosstalk as much as possible, the length of the inverter output line should be shortened as much as possible.

[0056] refer to Figures 8 to 10 As shown, in some embodiments, the electrical box also includes an inverter output line 101, multiple electrical components include a first electrical component 2, the first electrical component 2 includes a first mounting plate 21 and multiple first sub-electrical components installed on the first mounting plate 21, the multiple first sub-electrical components include an inverter output terminal 22, a lead outlet 12 is provided on the box body 1, the inverter output line 101 is connected between the inverter output terminal 22 and the lead outlet 12, and the inverter output terminal 22 is arranged at a position close to the side of the first mounting plate 21 opposite to the lead outlet 12.

[0057] It is understandable that the inverter output terminal 22 is arranged near the side of the first mounting plate 21 opposite to the lead outlet 12 , where “near” refers to the side of the first mounting plate 21 not opposite to the lead outlet 12 .

[0058] By setting the inverter output terminal 22 at a position close to one of the side surfaces of the first mounting plate 21, the side surface is arranged opposite to the lead outlet 12, that is, the side surface and the inner wall of the box body 1 where the lead outlet 12 is arranged are arranged face to face, the length of the inverter output line 101 connected between the inverter output terminal 22 and the lead outlet 12 can be effectively shortened, the arrangement of the inverter output line 101 is facilitated, the routing crosstalk between the inverter output line 101 and other lines inside the electrical box is alleviated, and the electromagnetic interference formed by the inverter output current is reduced.

[0059] In some embodiments, the lead outlet 12 is disposed on the bottom wall of the box body 1 , and the inverter output line 101 extends downward along the height direction of the box body 1 .

[0060] By setting the lead outlet 12 on the bottom wall of the box body 1, the inverter output line 101 can be extended downward from the inverter output terminal 22 along the height direction of the box body 1, avoiding crosstalk with the connecting lines above and on the left and right sides of the first electrical device 2, thereby reducing the electromagnetic interference caused by the inverter output line 101 to the components above and on the left and right sides of the first electrical device 2.

[0061] In some embodiments, the plurality of first sub-electrical devices include three rectifier input terminals 23 and three inverter output terminals 22, the output directions of at least two of the three inverter output terminals 22 are parallel, the input directions of the three rectifier input terminals 23 are parallel, and the output directions of at least two inverter output terminals 22 are perpendicular to the input directions of the three rectifier input terminals 23.

[0062] By setting the output directions of at least two of the three inverter output terminals 22 to be parallel, the two inverter output lines connected to the at least two inverter output terminals 22 can be made parallel, which is convenient for controlling the arrangement of the output lines and avoiding crosstalk with other connecting lines; by setting the input directions of the three rectifier input terminals 23 to be parallel, the three rectifier input lines connected to the three rectifier input terminals 23 can be made parallel, which is convenient for controlling the arrangement of the input lines and avoiding crosstalk with other connecting lines; by setting the output directions of at least two inverter output terminals 22 to be perpendicular to the input directions of the three rectifier input terminals 23, the routing crosstalk between the output lines connected to the inverter output terminals 22 and the input lines connected to the rectifier input terminals 23 can be effectively alleviated, and the electromagnetic interference between the rectifier input and the inverter output can be reduced.

[0063] Moreover, the output direction of at least two inverter output terminals 22 is set to be perpendicular to the input direction of the three rectifier input terminals 23. Even after the first mounting plate 21 rotates relative to the box body 1, the output lines connected to the inverter output terminals 22 and the input lines connected to the rectifier input terminals 23 can still be kept perpendicular to each other, thereby reducing mutual interference between the rectifier input and the inverter output.

[0064] In some embodiments, the plurality of electrical components include a second electrical component 3 , among which the second electrical component 3 has the largest heat generation power, and the second electrical component 3 is disposed at the top of the accommodating cavity 11 along the height direction of the box body 1 .

[0065] The second electrical device 3 has the largest heating power. The second electrical device 3 is arranged at the top of the accommodating cavity 11 along the height direction of the box body 1. This can prevent the high-temperature hot air generated by the second electrical device 3 from flowing upward and causing damage to the electrical devices with lower high-temperature resistance located above the second electrical device 3, thereby reducing the service life of these electrical devices and affecting the normal operation of the electrical box.

[0066] In some embodiments, the electrical box also includes a first connecting line 102, multiple electrical components include a first electrical component 2, the first electrical component 2 is arranged below the second electrical component 3 along the height direction of the box body 1, the first electrical component 2 includes a first mounting plate 21 and multiple first sub-electrical components installed on the first mounting plate 21, the first sub-electrical component includes a first connecting terminal 24, the second electrical component 3 includes a second mounting plate 31 and multiple second sub-electrical components installed on the second mounting plate 31, the second sub-electrical component includes a second connecting terminal 32, the first connecting terminal 24 is arranged at a position close to the side of the first mounting plate 21 opposite to the second mounting plate 31, the second connecting terminal 32 is arranged at a position close to the side of the second mounting plate 31 opposite to the first mounting plate 21, and the first connecting line 102 connects the first connecting terminal 24 and the second connecting terminal 32.

[0067] It is understandable that the first connection terminal 24 is arranged at a position close to the side of the first mounting plate 21 opposite to the second mounting plate 31 , where “close” is relative to the side of the first mounting plate 21 that is not opposite to the second mounting plate 31 .

[0068] It is understandable that the second connection terminal 32 is arranged at a position close to the side of the second mounting plate 31 opposite to the first mounting plate 21 , where “close” is relative to the side of the second mounting plate 31 not opposite to the first mounting plate 21 .

[0069] By setting the first connecting terminal 24 at a position close to one of the side surfaces of the first mounting plate 21, the side surface is opposite to the second mounting plate 31, that is, the side surface is face to face with the second mounting plate 31; and setting the second connecting terminal 32 at a position close to one of the side surfaces of the second mounting plate 31, the side surface is opposite to the first mounting plate 21, that is, the side surface is face to face with the first mounting plate 21, the length of the first connecting wire 102 connecting the first connecting terminal 24 and the second connecting terminal 32 can be effectively shortened, the arrangement of the first connecting wire 102 is facilitated, the arrangement of the first connecting wire 102 is facilitated, the routing crosstalk between the first connecting wire 102 and other wires inside the electrical box is alleviated, and the electromagnetic interference of the first connecting wire 102 to other electrical components is reduced.

[0070] In some embodiments, the multiple electrical devices include a first electrical device 2 and a third electrical device 4, and the first electrical device 2 and the third electrical device 4 are both arranged below the second electrical device 3 in the height direction of the box body 1, and the third electrical device 4 is located on the left side of the first electrical device 2 and the second electrical device 3 in the width direction of the box body 1, so that the lead-out wires and the lead-in wires of the third electrical device 4 do not intersect with the induced magnetic field formed by the first coil 33 in the second electrical device 3.

[0071] By arranging the first electrical device 2 and the third electrical device 4 below the second electrical device 3 in the height direction of the box body 1, and locating the third electrical device 4 on the left side of the first electrical device 2 and the second electrical device 3 in the width direction of the box body 1, the third electrical device 4 can be located at the lower left of the second electrical device 3, so that the third electrical device 4 and the second electrical device 3 are in a diagonal position relationship, thereby minimizing the mutual interference between the third electrical device 4 and the second electrical device 3, and providing convenient conditions for preventing the lead-out wires and lead-in wires of the third electrical device 4 from intersecting with the induced magnetic field formed by the first coil 33 in the second electrical device 3.

[0072] For example, the lead inlet 13 on the box body 1 can be set on the bottom wall of the box body 1, and the lead-in wire of the third electrical device 4 can be connected to the third electrical device 4 from the bottom of the box body 1 to the left, and the lead-out wire of the third electrical device 4 can be connected to the first electrical device 2 from the right side, so that the lead-out wire and the lead-in wire of the third electrical device 4 do not intersect with the induced magnetic field formed by the first coil 33 in the second electrical device 3.

[0073] In some embodiments, the multiple electrical devices include a first electrical device 2 and a third electrical device 4, the third electrical device 4 and the first electrical device 2 are arranged left and right along the width direction of the box body 1, the first electrical device 2 includes a first mounting plate 21 and a plurality of first sub-electrical devices installed on the first mounting plate 21, the third electrical device 4 includes a third mounting plate 41 and a plurality of third sub-electrical devices installed on the third mounting plate 41, the first mounting plate 21 is installed on the first inner side wall of the box body 1, the first sub-electrical devices are installed on the side of the first mounting plate 21 away from the first inner side wall, and the third sub-electrical devices are installed on the side of the third mounting plate 41 close to the first inner side wall.

[0074] By arranging the first mounting plate 21 and the third mounting plate 41 to be parallel to the first inner side wall of the box body 1, and the first sub-electrical device is installed on the side of the first mounting plate 21 away from the first inner side wall, and the third sub-electrical device is installed on the side of the third mounting plate 41 close to the first inner side wall, the first sub-electrical device can be extended from the first mounting plate 21 in the direction away from the first inner side wall, and the third sub-electrical device can be extended from the third mounting plate 41 in the direction close to the first inner side wall, that is, the installation directions of the first sub-electrical device and the third sub-electrical device are opposite in the thickness direction of the box body 1, or it can be understood that the first sub-electrical device is installed in the forward direction on the first mounting plate 21 and the third sub-electrical device is installed in the reverse direction on the third mounting plate 41, or the first sub-electrical device is installed in the reverse direction on the first mounting plate 21 and the third sub-electrical device is installed in the forward direction on the third mounting plate 41.

[0075] By setting the installation direction of the first sub-electrical device on the first mounting plate 21 to be opposite to the installation direction of the third sub-electrical device on the third mounting plate 41, the airflow can pass through the direction of the first mounting plate 21 away from the first inner side wall when flowing through the first electrical device 2, and pass through the direction of the third mounting plate 41 close to the first inner side wall when flowing through the third electrical device 4. This can not only reduce the flow resistance of the airflow in the accommodating cavity 11 of the box body 1, improve the airflow condition, and improve the temperature uniformity inside the electrical box, but also effectively improve the cooling effect on the third sub-electrical device when the cooling airflow flows through the first sub-electrical device first, thereby avoiding the cooling airflow being blocked by the third mounting plate 41 when the installation directions of the first sub-electrical device and the third sub-electrical device are the same, thereby affecting the cooling effect on the third sub-electrical device.

[0076] In some embodiments, the electrical box also includes a second connecting line 103, multiple third sub-electrical devices include a filter output terminal 42, multiple first sub-electrical devices include a rectifier input terminal 23, the second connecting line 103 connects the filter output terminal 42 and the rectifier input terminal 23, and the second connecting line 103 extends in a horizontal direction.

[0077] The third electrical device 4 and the first electrical device 2 are arranged left and right along the width direction of the box body. By setting the second connecting line 103 connecting the filter output terminal 42 and the rectifier input terminal 23 to extend in the horizontal direction, the bending of the second connecting line 103 can be reduced, the length of the second connecting line 103 can be shortened as much as possible, and the crosstalk between the second connecting line 103 and other connecting lines in the electrical box can be reduced, thereby reducing the electromagnetic interference inside the electrical box.

[0078] In some embodiments, the electrical box also includes a third connecting wire 104, and multiple third sub-electrical components include a filter input terminal 43, the filter input terminal 43 is arranged on the third mounting plate 41 near its left side surface, and the bottom wall of the box body 1 is provided with a lead inlet 13, and the third connecting wire 104 is connected between the lead inlet 13 and the filter input terminal 43.

[0079] By providing the third connecting wire 104 , the power line connected from the lead-in inlet 13 of the box body 1 can be connected to the filter input terminal 43 , thereby realizing the connection of the power line.

[0080] The lead inlet 13 is arranged on the bottom wall of the box body 1, and the filter input terminal 43 is arranged on the third mounting plate 41 near the left side of the third mounting plate 41, so that the third connecting line 104 can be introduced from the lead inlet 13 and extend to the left side of the box body 1 until it is connected to the filter input terminal 43 arranged on the third mounting plate 41 near its left side. This path can effectively reduce the crosstalk with other connecting lines in the electrical box and reduce the spatial radiation of the power supply line. The lead inlet 13 and the filter input terminal 43 are connected in the form of an external wire, which has good heat dissipation performance and good versatility.

[0081] When an external wire is used to connect the lead inlet 13 and the filter input terminal 43, the lead inlet 13 is set on the bottom wall of the box body 1, and the filter input terminal 43 is set on the third mounting plate 41 near the left side of the third mounting plate 41. The length of the third connecting line 104 can be shortened as much as possible under the premise of reducing electromagnetic interference with other electrical components, that is, the length of the power supply line inside the electrical box is shortened, thereby reducing external interference transmitted into the interior of the electrical box.

[0082] In some embodiments, the electrical box also includes a terminal block 7, which is installed on the outer wall of the box body 1. The terminal block 7 includes a first connection port 71 and a second connection port 72 arranged front to back along the thickness direction of the box body 1. The third connecting line 104 passes through the lead inlet 13 and is connected to the second connection port 72 located on the rear side. The first connection port 71 located on the front side is used to connect to the power supply.

[0083] By configuring the wiring board 7 to include the first connection port 71 and the second connection port 72 arranged front and back along the thickness direction of the box body 1, that is, the wiring board 7 is a front and back two-layer structure, the third connection line 104 can be connected to the second connection port 72 at the rear side of the wiring board 7, and the first connection port 71 at the front side is used to connect the power supply. In this way, when manufacturing the electrical box, the internal connection line can be pre-connected to the rear side of the wiring board 7 to avoid the internal connection line from being exposed, which is conducive to improving the safety of the electrical box; and when using the electrical box, it is only necessary to connect the power supply to the first connection port 71 at the front side of the wiring board 7, which is simple and quick to operate.

[0084] The number of the first connection port 71 and the second connection port 72 can be flexibly set as needed, for example, one, two or more. The number of the first connection port 71 and the second connection port 72 can be the same or different.

[0085] When there are multiple first connection ports 71 and second connection ports 72 and the number is the same, the first connection ports 71 and the second connection ports 72 can be arranged correspondingly in the front-to-back direction to facilitate corresponding identification of the types of the rear connection ports outside the electrical box to prevent wrong connection.

[0086] In some embodiments, the plurality of electrical components include a third electrical component 4 and a fourth electrical component 5 , and the third electrical component 4 and the fourth electrical component 5 are arranged front and back along the thickness direction of the box body 1 .

[0087] By arranging the third electrical component 4 and the fourth electrical component 5 to be arranged front and back along the thickness direction of the box body 1, the third electrical component 4 and the fourth electrical component 5 can form a double-layer arrangement structure, thereby fully utilizing the internal space of the accommodating cavity 11, optimizing the internal structure layout, saving internal space, and reducing the total volume of the electrical box.

[0088] In some embodiments, the third electrical device 4 includes a third mounting board 41 and a plurality of third sub-electrical devices mounted on the third mounting board 41, the fourth electrical device 5 includes a fourth mounting board 51 and a plurality of fourth sub-electrical devices mounted on the fourth mounting board 51, the third mounting board 41 is connected to the fourth mounting board 51, the plurality of third sub-electrical devices are mounted on a side of the third mounting board 41 away from the fourth mounting board 51, and the plurality of fourth sub-electrical devices are mounted on a side of the fourth mounting board 51 away from the third mounting board 41.

[0089] By connecting the third mounting board 41 with the fourth mounting board 51, and installing multiple third sub-electronic components on the side of the third mounting board 41 away from the fourth mounting board 51, and multiple fourth sub-electronic components on the side of the fourth mounting board 51 away from the third mounting board 41, the third sub-electronic components and the fourth sub-electronic components can be extended in opposite directions and separated by the third mounting board 41 and the fourth mounting board 51, which is beneficial to reducing heat interaction and electromagnetic interference between the third sub-electronic components and the fourth sub-electronic components.

[0090] In some embodiments, the electrical box also includes a first connecting plate 91, which is arranged between the third mounting plate 41 and the fourth mounting plate 51 to separate the connecting wires connected to the third electrical device 4 and the connecting wires connected to the fourth electrical device 5, and the first connecting plate 91 is made of a good conductor material.

[0091] By setting a first connecting plate 91 between the third mounting plate 41 and the fourth mounting plate 51, the third mounting plate 41 and the fourth mounting plate 51 can be separated, and the third sub-electrical device and the fourth sub-electrical device as well as the connecting wires connected to the third electrical device 4 and the connecting wires connected to the fourth electrical device 5 can be separated, thereby reducing wiring crosstalk and further reducing heat interaction and electromagnetic interference between the third sub-electrical device and the fourth sub-electrical device.

[0092] Radiated electromagnetic waves cannot penetrate good conductors. The first connecting plate 91 is made of good conductor material, which can effectively isolate the connecting wire connected to the third electrical device 4 and the connecting wire connected to the fourth electrical device 5, thereby reducing electromagnetic interference.

[0093] Good conductor materials may include metal materials, such as copper, aluminum, Q235 alloy steel, etc.

[0094] In some embodiments, the electrical box also includes a first communication line 105 and a second communication line 106, and the multiple electrical devices include a first electrical device 2 and a fifth electrical device 6. The first communication line 105 is connected to the fourth electrical device 5, and the fifth electrical device 6 is arranged above the fourth electrical device 5 along the height direction of the box body 1. The second communication line 106 is connected to the fifth electrical device 6. The first communication line 105 and the second communication line 106 first extend upward to converge at the top wall of the box body 1, and then extend to the right along the top wall of the box body 1 and extend downward along the right side wall of the box body 1, and are connected to the lower part of the first electrical device 2 close to the right side wall of the box body 1. In the width direction of the box body 1, the first electrical device 2 is arranged on the right side of the third electrical device 4 and the fourth electrical device 5.

[0095] By first extending the first communication line 105 and the second communication line 106 upward to meet at the top wall of the box body 1, the first communication line 105 and the second communication line 106 can be kept as far away from other electrical components inside the box body 1 as possible after being led out, thereby reducing electromagnetic interference between the first communication line 105 and the second communication line 106 and other electrical components inside the box body 1 (especially the second electrical component 3 located at the top); at the same time, after the first communication line 105 and the second communication line 106 meet at the top wall of the box body 1, they extend to the right along the top wall of the box body 1 and extend downward along the right side wall of the box body 1, and are connected to the lower part of the first electrical component 2 near the right side wall of the box body 1, thereby avoiding contact with the electrical components and connecting wires inside the box body 1 as much as possible throughout the entire extension path, thereby effectively reducing electromagnetic interference.

[0096] In some embodiments, the plurality of electrical devices include a second electrical device 3, which is disposed above the first electrical device 2, the third electrical device 4, and the fourth electrical device 5 in the height direction of the box body 1, the first communication line 105 and the second communication line 106 both pass over the second electrical device 3, and the portions of the first communication line 105 and the second communication line 106 that pass over the second electrical device 3 are located in the middle position of the first coil 33 in the second electrical device 3 in the thickness direction of the box body 1.

[0097] The first coil 33 in the second electrical device 3 is a magnetic dipole radiation antenna with large current fluctuations. Its high-frequency electromagnetic radiation has a certain power angular distribution, which is proportional to sinθ in the spherical coordinate system. 2 Therefore, after the first communication line 105 and the second communication line 106 are led out, they pass through the middle position of the first coil 33 in the second electrical device 3 in the thickness direction of the box body 1 when passing over the second electrical device 3. At this time, θ=π / 2, the radiation power is the weakest, and the crosstalk is the smallest.

[0098] In some embodiments, the electrical appliance box further includes a first electrical component 2 and a heat sink 8 . The heat sink 8 is disposed in the accommodating cavity 11 , and the heat sink 8 is located below the first electrical component 2 in the height direction of the box body 1 .

[0099] By providing the radiator 8, a cooling airflow can be provided to dissipate heat for the multiple electrical components inside the box body 1, thereby reducing the temperature of the electrical components and preventing high temperature from affecting the normal operation and service life of the electrical components.

[0100] The radiator 8 may be an air-cooled cooling component such as a fan, or other types of cooling components.

[0101] By arranging the radiator 8 below the first electrical component 2 in the height direction of the box body 1, when an air-cooled cooling component is used, the radiator 8 can first effectively dissipate the heat of the first electrical component 2, and the cooled airflow can continue to flow upward to continue to dissipate the heat of the components above the first electrical component 2, while the area on the left side of the first electrical component 2 can form a return airflow under the action of the negative pressure formed by the radiator 8, thereby realizing the circulating airflow inside the box body 1.

[0102] In some embodiments, the first electrical device 2 includes a switching power supply component 26 , and an air outlet of the heat sink 8 faces the switching power supply component 26 .

[0103] The switching power supply assembly 26 includes components that are easily damaged by high temperature, such as high-frequency transformers, electrolytic capacitors and surface mount devices. By placing the air outlet of the radiator 8 directly toward the switching power supply assembly 26, these easily damaged components can be effectively cooled down, thereby increasing the service life of these easily damaged components.

[0104] In some embodiments, in the height direction of the box body 1 , the distance between the air inlet of the radiator 8 and the bottom wall of the accommodating cavity 11 is greater than 20 mm.

[0105] By setting the distance between the air inlet of the radiator 8 and the bottom wall of the accommodating cavity 11 to be greater than 20 mm, it can be avoided that the bottom wall of the accommodating cavity 11 is too close to the air inlet of the radiator 8 and causes blockage of the air inlet, affecting the air volume and reducing the cooling effect of the radiator 8.

[0106] 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.

[0107] 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.

[0108] The following is combined with Figures 1 to 16 The structural arrangement and internal wiring arrangement of an embodiment of the electrical box provided by the utility model are described as follows:

[0109] like Figures 1 to 3 As shown, the electrical box includes a box body 1, the interior of the box body 1 is provided with a receiving cavity 11, and the receiving cavity 11 is provided with a first electrical component 2, a second electrical component 3, a third electrical component 4, a fourth electrical component 5, a fifth electrical component 6 and a heat sink 8. The electrical box also includes a wiring board 7, which is connected to the outside of the box body 1.

[0110] like Figure 4As shown, the box body 1 is placed vertically, and in the height direction, the second electrical component 3 is located at the top, and the first electrical component 2, the third electrical component 4, the fourth electrical component 5 and the heat sink 8 are all located below the second electrical component 3. The first electrical component 2 is located below the second electrical component 3, and the heat sink 8 is located below the first electrical component 2. The third electrical component 4 and the fourth electrical component 5 are located below the fifth electrical component 6.

[0111] In the width direction, the third electric component 4 , the fourth electric component 5 , and the fifth electric component 6 are located on the left, and the first electric component 2 , the second electric component 3 , and the heat sink 8 are located on the right.

[0112] like Figure 5 and Figure 6 As shown, it can be seen that the third electrical component 4 and the fourth electrical component 5 are arranged front to back. In the front-to-back direction, the third electrical component 4 is located behind the fourth electrical component 5. The installation direction of the third sub-electrical component on the third electrical component 4 is opposite to the installation direction of the fourth sub-electrical component on the fourth electrical component 5, and the installation direction of the third sub-electrical component on the third electrical component 4 is also opposite to the installation direction of the first sub-electrical component on the first electrical component 2.

[0113] A first connecting plate 91, a second connecting plate 92 and a third connecting plate 93 are also provided in the box body 1. The first connecting plate 91 is connected between the third electrical component 4 and the fourth electrical component 5. The first connecting plate 91, the second connecting plate 92 and the third connecting plate 93 are connected to the inner wall of the box body 1 to form a substantially closed space, and the fourth electrical component 5 is installed in the space.

[0114] The first connecting plate 91 is perpendicular to the front-to-back direction of the box body 1 , the second connecting plate 92 is perpendicular to the width direction of the box body 1 , and the third connecting plate 93 is perpendicular to the height direction of the box body 1 .

[0115] The first connecting plate 91 , the second connecting plate 92 and the third connecting plate 93 are all made of good conductor materials, such as metal materials, and can isolate the third electrical device 4 and the fourth electrical device 5 , as well as the connecting wires connected to the third electrical device 4 and the fourth electrical device 5 .

[0116] like Figure 7 As shown, the wiring board 7 is a front-to-back double-layer structure, and a plurality of second connection ports 72 are provided on the rear side of the wiring board 7, and the second connection ports 72 are introduced into the interior of the box body 1 through connection wires. A plurality of first connection ports 71 corresponding to the second connection ports 72 are provided on the front side for connecting a power source.

[0117] like Figure 8 The bottom wall of the box body 1 is provided with a lead wire outlet 12 and a lead wire inlet 13. The lead wire outlet 12 is provided with a lead wire protection cylinder, and the lead wire inlet 13 is connected to the terminal block 7.

[0118] like Figures 8 to 10As shown, the high-voltage connecting wires inside the box body 1 include an inverter output wire 101 , a first connecting wire 102 , a second connecting wire 103 and a third connecting wire 104 .

[0119] The weak current connection lines inside the box body 1 include a first communication line 105 and a second communication line 106 .

[0120] like Fig. 9 As shown, the first electrical device 2 includes a first mounting board 21 and a first sub-electrical device arranged on the first mounting board 21, and the first sub-electrical device includes an inverter output terminal 22, a rectifier input terminal 23, a first connecting terminal 24, a third connecting terminal 25 and a switching power supply component 26.

[0121] The number of the inverter output terminals 22 and the rectifier input terminals 23 are both three, and the three rectifier input terminals 23 are collinearly arranged on the first mounting plate 21 near the left side surface along the height direction, one of the three inverter output terminals 22 is substantially collinear with the straight line where the three rectifier input terminals 23 are located, and the other two inverter output terminals 22 are collinearly arranged at the lower left corner of the first mounting plate 21. Moreover, the output directions of the other two inverter output terminals 22 are perpendicular to the input directions of the three rectifier input terminals 23.

[0122] The first connection terminal 24 is disposed on the first mounting plate 21 near the top surface, the third connection terminal 25 is disposed on the first mounting plate 21 near the bottom surface, and the switching power supply assembly 26 is disposed at the lower right corner of the first mounting plate 21 .

[0123] The second electrical component 3 includes a second mounting board 31 and a second sub-electrical component disposed on the second mounting board 31 , and the second sub-electrical component includes a second connecting terminal 32 and a first coil 33 . The second connecting terminal is disposed on the second mounting board 31 near the bottom surface.

[0124] The third electrical component 4 includes a third mounting board 41 and a third sub-electrical component disposed on the third mounting board 41 . The third sub-electrical component includes a filter output terminal 42 , a filter input terminal 43 and a second coil 44 .

[0125] The number of the filter output terminal 42 and the filter input terminal 43 are both three. The three filter output terminals 42 are arranged on the right side of the third mounting plate 41 in a collinear manner along the height direction, and the three filter input terminals 43 are arranged on the left side of the third mounting plate 41 in a collinear manner along the height direction. The output direction of the filter output terminal 42 and the input direction of the filter input terminal 43 are both horizontal directions. The second coil 44 is arranged between the filter output terminal 42 and the filter input terminal 43.

[0126] like Fig.10As shown, the fourth electrical device 5 includes a fourth mounting board 51 and a fourth sub-electrical device 52 mounted on the fourth mounting board 51. The fourth sub-electrical device 52 includes a plurality of control components.

[0127] like Figures 10 to 12 As shown, the first mounting plate 21 and the second mounting plate 31 are both mounted on the rear side wall of the accommodating cavity 11, and the first sub-electronic component and the second sub-electronic component are both mounted toward the front side wall of the accommodating cavity 11, which is a forward installation.

[0128] The third mounting plate 41 and the fourth mounting plate 51 are both mounted on the first connecting plate 91 , the third mounting plate 41 is mounted on the rear side of the first connecting plate 91 , and the fourth mounting plate 51 is mounted on the front side of the first connecting plate 91 .

[0129] The third sub-electrical component is installed toward the rear side wall of the accommodating cavity 11, which is reverse installation. The fourth sub-electrical component 52 is installed toward the front side wall of the accommodating cavity 11, which is forward installation.

[0130] The fifth electrical component 6 includes a fifth mounting plate and a fifth sub-electrical component mounted on the fifth mounting plate. The fifth mounting plate is mounted on the rear side wall of the accommodating cavity 11 . The fifth sub-electrical component is mounted toward the front side wall of the accommodating cavity 11 , which is a forward installation.

[0131] The inverter output line 101 is connected between the inverter output terminal 22 and the lead outlet 12. The inverter output line 101 extends downward from the inverter output terminal 22 along the height direction, or first extends downward from the inverter output terminal 22 along the height direction, then bends a little to the right and then leads out downward along the height direction.

[0132] The first connection line 102 connects the first connection terminal 24 and the second connection terminal 32 . The first connection line 102 extends forward from the first connection terminal 24 along the thickness direction, then upward along the height direction, and then extends backward along the thickness direction to connect to the second connection terminal 32 .

[0133] The second connection line 103 connects the filter output terminal 42 and the rectifier input terminal 23 . The second connection line 103 is connected from the filter output terminal 42 to the rectifier input terminal 23 in the right direction along the width direction.

[0134] The third connection line 104 is connected between the lead inlet 13 and the filter input terminal 43. After being introduced from the lead inlet 13, the third connection line 104 first extends upward in the height direction, then extends to the left in the width direction, then extends upward in the height direction, and finally connects to the filter input terminal 43 to the right in the width direction.

[0135] The first communication line 105 connects the connection terminal on the third mounting plate 41 and the third connection terminal 25, and the second communication line 106 connects the connection terminal on the fifth mounting plate and the third connection terminal 25. The first communication line 105 and the second communication line 106 are respectively led out from the third mounting plate 41 and the fifth mounting plate, and then extend upward along the height direction to the top wall of the accommodating cavity 11, and after merging with the top wall, extend to the right along the width direction along the top wall, and then extend downward along the height direction along the right side wall of the accommodating cavity 11, and finally extend to the left along the width direction to connect to the third connection terminal 25.

[0136] In this embodiment, the first electrical component 2 is a drive integrated board, the second electrical component 3 is a reactor, the third electrical component 4 is a filter board, the fourth electrical component 5 is a main control board, and the fifth electrical component 6 is a fan drive board.

[0137] like Fig.13 As shown in the figure, when the inverter performs PWM control, the output voltage waveform is a rectangular wave, and the three voltage platforms of the rectangular wave are the positive and negative bus voltages and zero; Fig.14 As shown in the figure, when the inverter performs PWM control, the output current waveform is approximately a sine wave, but the sine current wave contains step ripples of the switching frequency. This distorted electric field and distorted current will introduce a large frequency range of conducted interference noise and spatial electromagnetic radiation into the circuit. Therefore, an EMI filter is generally added before rectification to suppress high-frequency interference in the internal circuit and prevent external interference from entering the system.

[0138] like Fig.15 As shown, the grid-side current carried by the power cable contains high-frequency harmonics. According to the geometric shape of the power cable, the time-varying line current can be equivalent to a straight line or a circular antenna, thereby emitting electric dipole or magnetic dipole radiation. At this time, if the distance between different power cables is close in space, the radiation fields will be superimposed, coupled, and mixed with each other, which is the crosstalk between the lines.

[0139] like Fig.16 As shown, the reactor coil forms a magnetic dipole antenna, carrying large-amplitude current harmonics of 6 times the power supply frequency and some higher harmonics, and cannot intersect or approach the lines before and after filtering.

[0140] In the embodiment of the utility model, the positional arrangement relationship of the electrical components inside the electrical box is as follows: the reactor is placed above the drive integrated board, and the reactor is set at the top of the electrical box. The heating power of the reactor is the largest. It is placed on the upper side in the direction of gravity to avoid the high temperature of the reactor from having a negative impact on other components with lower temperature resistance. The filter board and the drive integrated board are placed on the same horizontal plane, the drive integrated board is on the right, and the filter board is fixed upside down on the back of the main control board. The air outlet of the radiator is aligned with the area where the switching power supply components on the drive integrated board are located. The area contains easily damaged components such as high-frequency transformers, electrolytic capacitors and SMD components. The distance between the air inlet of the radiator and the inner wall of the storage cavity in the electrical box is more than 20mm, which effectively avoids the blocking of the air outlet of the radiator from being blocked and affecting the heat dissipation effect. The filter board is hung upside down to greatly reduce the flow resistance of the return air of the radiator, while not affecting the heat dissipation of the key choke.

[0141] The area near the radiator's air outlet has the best heat dissipation effect, followed by the return air area, and finally the upper area with greater flow resistance. The switching power supply components, chokes on the filter board, and reactors are placed in order according to priority and high temperature resistance. With this layout, when the electrical box is fully enclosed, under the worst working conditions, only one radiator can meet the temperature rise of all components in the electrical box.

[0142] The airflow path in the box body is as follows: the airflow from the air outlet of the radiator first flows through the switching power supply component on the first mounting plate to dissipate heat in the area where the switching power supply component is located; then, it flows through other sub-electrical components on the first mounting plate, and then passes upward through the inductor to dissipate heat for the first coil of the inductor; then, since the electrical components on the filter board are installed in reverse, the resistance to the airflow is small, and under the negative pressure of the air inlet of the radiator, the airflow continues to flow downward through the filter board to dissipate heat for the second coil, and finally the airflow is sucked into the air inlet of the radiator to realize return air, and the airflow completes the circulation flow in the box body.

[0143] The wiring path is: the external three-phase power line is connected to the first connection port on the front side of the wiring board, and the upper and lower potentials of the same wiring position on the front and rear sides are electrically connected. Then the power line is led out from the second connection port on the rear side of the wiring board and connected to the filter input terminal on the filter board. The filter output terminal is parallel to the horizontal direction and connected to the rectifier input terminal on the integrated drive board in a nearly straight line. In this way, the power line after filtering is the shortest, and the length of the power line before filtering is controllable. In addition, the use of external wires has better heat dissipation and better versatility.

[0144] At least two of the three inverter output terminals are arranged in a direction perpendicular to the three parallel rectifier input terminals, so that the inverter output line goes out directly downward. Even if the driver integrated board is rotated 180°, crosstalk between the rectifier input and output lines can be effectively avoided. The inverter output goes out directly downward and is led out to the outside through the opposite lead outlet.

[0145] In the embodiment of the utility model, the first connection terminal for connecting the reactor on the driving integrated board is placed opposite to the second connection terminal of the reactor itself, so as to achieve the shortest connection line of the reactor and avoid crosstalk with other lines. The first coil on the reactor itself acts as a magnetic dipole radiation antenna with large current fluctuations, and its high-frequency electromagnetic radiation has a certain power angle distribution, which is proportional to sinθ in the spherical coordinate system. 2 Therefore, when the first communication line led out from the integrated drive board passes through the back of the reactor, it passes through the middle position of the first coil in the thickness direction. At this time, θ=π / 2, the radiation power is the weakest, and the crosstalk is the smallest.

[0146] The main control board is isolated from the filter board and main circuit behind it through the first connecting plate. The first connecting plate is made of good conductor material, and radiated electromagnetic waves cannot penetrate good conductors. Therefore, most of the weak current wires connected to the main control are isolated from the strong current parts below through the first connecting plate.

[0147] In the embodiment of the utility model, by arranging the positions and routing of multiple electrical components inside the box body, the length of the power supply line inside the electrical box can be effectively shortened to prevent external interference from being transmitted into the interior and interfering with other lines through space radiation; the length of the inverter output line is shortened while avoiding being close to all other lines; the reactor coil does not intersect or approach the lines before and after the filter; and the strong wires and the weak wires are also routed separately.

[0148] Under the premise of taking both heat dissipation and electromagnetic compatibility effects into consideration, the embodiments of the utility model can simultaneously meet the heat dissipation and electromagnetic compatibility issues of a fully enclosed electrical box by comprehensively optimizing and improving the placement direction and position of the mainboard in the electrical box, the placement direction and position of the terminals, the wiring path, the position of the wire holes in the electrical box itself, etc., while shortening the internal power lines and saving costs.

[0149] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0150] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0151] 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) having a receiving chamber (11) disposed therein; and A plurality of electrical components are disposed in the accommodating cavity (11), and the plurality of electrical components are arranged in the accommodating cavity (11) to simultaneously meet the preset requirements of the plurality of electrical components for heat dissipation and electromagnetic compatibility.

2. The electrical box according to claim 1, characterized in that: The invention also comprises an inverter output line (101), the plurality of electrical components comprising a first electrical component (2), the first electrical component (2) comprising a first mounting plate (21) and a plurality of first sub-electrical components mounted on the first mounting plate (21), the plurality of first sub-electrical components comprising an inverter output terminal (22), the box body (1) being provided with a lead outlet (12), the inverter output line (101) being connected between the inverter output terminal (22) and the lead outlet (12), and the inverter output terminal (22) being arranged at a position close to a side surface of the first mounting plate (21) opposite to the lead outlet (12).

3. The electrical box according to claim 2, characterized in that: The lead outlet (12) is arranged on the bottom wall of the accommodating cavity (11), and the inverter output line (101) extends downward along the height direction of the box body (1).

4. The electrical box according to claim 2, characterized in that: The plurality of first sub-electrical devices include three rectifier input terminals (23) and three inverter output terminals (22), wherein output directions of at least two of the three inverter output terminals (22) are parallel, input directions of the three rectifier input terminals (23) are parallel, and the output direction of at least two of the inverter output terminals (22) is perpendicular to the input direction of the three rectifier input terminals (23).

5. The electrical box according to claim 1, characterized in that: The plurality of electrical components include a second electrical component (3). Among the plurality of electrical components, the second electrical component (3) has the largest heat generation power, and the second electrical component (3) is arranged at the top of the accommodating cavity (11) along the height direction of the box body (1).

6. The electrical box according to claim 5, characterized in that: The box body (1) further comprises a first connecting wire (102), wherein the plurality of electrical components comprise a first electrical component (2), wherein the first electrical component (2) is arranged below the second electrical component (3) along the height direction of the box body (1), wherein the first electrical component (2) comprises a first mounting plate (21) and a plurality of first sub-electrical components mounted on the first mounting plate (21), wherein the first sub-electrical component comprises a first connecting terminal (24), and the second electrical component (3) comprises a second mounting plate (31) and a plurality of second sub-electrical components mounted on the second mounting plate (31), wherein the second sub-electrical component comprises a second connecting terminal (32), wherein the first connecting terminal (24) is arranged at a position close to a side surface of the first mounting plate (21) opposite to the second mounting plate (31), and the second connecting terminal (32) is arranged at a position close to a side surface of the second mounting plate (31) opposite to the first mounting plate (21), and the first connecting wire (102) connects the first connecting terminal (24) and the second connecting terminal (32).

7. The electrical box according to claim 5, characterized in that: The plurality of electrical components include a first electrical component (2) and a third electrical component (4); in the height direction of the box body (1), the first electrical component (2) and the third electrical component (4) are both arranged below the second electrical component (3); and in the width direction of the box body (1), the third electrical component (4) is located on the left side of the first electrical component (2) and the second electrical component (3), so that the lead-out wire and the lead-in wire of the third electrical component (4) do not intersect with the induced magnetic field formed by the first coil (33) in the second electrical component (3).

8. The electrical box according to claim 1, characterized in that: The plurality of electrical components include a first electrical component (2) and a third electrical component (4); the third electrical component (4) and the first electrical component (2) are arranged left and right along the width direction of the box body (1); the first electrical component (2) includes a first mounting plate (21) and a plurality of first sub-electrical components mounted on the first mounting plate (21); the third electrical component (4) includes a third mounting plate (41) and a plurality of third sub-electrical components mounted on the third mounting plate (41); the first mounting plate (21) and the third mounting plate (41) are both parallel to the first inner side wall of the accommodating cavity (11); the first sub-electrical component is mounted on a side of the first mounting plate (21) away from the first inner side wall; and the third sub-electrical component is mounted on a side of the third mounting plate (41) close to the first inner side wall.

9. The electrical box according to claim 8, characterized in that: It also includes a second connecting line (103), a plurality of the third sub-electrical devices include a filter output terminal (42), a plurality of the first sub-electrical devices include a rectifier input terminal (23), the second connecting line (103) connects the filter output terminal (42) and the rectifier input terminal (23), and the second connecting line (103) extends in a horizontal direction.

10. The electrical box according to claim 8, characterized in that: It also includes a third connecting line (104), and the plurality of third sub-electronic components include a filter input terminal (43), the filter input terminal (43) is arranged at a position close to the left side surface of the third mounting plate (41), and the bottom wall of the accommodating cavity (11) is provided with a lead inlet (13), and the third connecting line (104) is connected between the lead inlet (13) and the filter input terminal (43).

11. The electrical box according to claim 10, characterized in that: The invention also comprises a terminal block (7), wherein the terminal block (7) is mounted on the outer wall of the box body (1), and the terminal block (7) comprises a first connection port (71) and a second connection port (72) arranged front to back along the thickness direction of the box body (1); the third connection line (104) passes through the lead-in entrance (13) and is connected to the second connection port (72) located at the rear side; and the first connection port (71) located at the front side is used for connecting a power source.

12. The electrical box according to claim 1, characterized in that: The plurality of electrical components include a third electrical component (4) and a fourth electrical component (5), and the third electrical component (4) and the fourth electrical component (5) are arranged front and back along the thickness direction of the box body (1).

13. The electrical box according to claim 12, characterized in that: The third electrical component (4) comprises a third mounting board (41) and a plurality of third sub-electrical components mounted on the third mounting board (41); the fourth electrical component (5) comprises a fourth mounting board (51) and a plurality of fourth sub-electrical components mounted on the fourth mounting board (51); the third mounting board (41) is connected to the fourth mounting board (51); the plurality of third sub-electrical components are mounted on a side of the third mounting board (41) away from the fourth mounting board (51); and the plurality of fourth sub-electrical components are mounted on a side of the fourth mounting board (51) away from the third mounting board (41).

14. The electrical box according to claim 13, characterized in that: The invention also comprises a first connecting plate (91), wherein the first connecting plate (91) is arranged between the third mounting plate (41) and the fourth mounting plate (51) to separate the connecting line connected to the third electrical device (4) from the connecting line connected to the fourth electrical device (5), and the first connecting plate (91) is made of a good conductor material.

15. The electrical box according to claim 12, characterized in that: It also includes a first communication line (105) and a second communication line (106), and the plurality of electrical devices include a first electrical device (2) and a fifth electrical device (6). The first communication line (105) is connected to the fourth electrical device (5), and the fifth electrical device (6) is arranged above the fourth electrical device (5) along the height direction of the box body (1), and the second communication line (106) is connected to the fifth electrical device (6). The first communication line (105) and the second communication line (106) first extend upward to merge at the top wall of the accommodating cavity (11), and then extend to the right along the top wall of the accommodating cavity (11) and extend downward along the right side wall of the accommodating cavity (11), and are connected to the lower part of the first electrical device (2) close to the right side wall of the accommodating cavity (11). In the width direction of the box body (1), the first electrical device (2) is arranged on the right side of the third electrical device (4) and the fourth electrical device (5).

16. The electrical box according to claim 15, characterized in that: The plurality of electrical components include a second electrical component (3), wherein the second electrical component (3) is arranged above the first electrical component (2), the third electrical component (4) and the fourth electrical component (5) in the height direction of the box body (1), the first communication line (105) and the second communication line (106) both pass above the second electrical component (3), and the portions of the first communication line (105) and the second communication line (106) passing above the second electrical component (3) are located in the middle of the first coil (33) in the second electrical component (3) in the thickness direction of the box body (1).

17. The electrical appliance box according to any one of claims 1 to 16, characterized in that: It also comprises a first electrical component (2) and a heat sink (8), wherein the heat sink (8) is arranged in the accommodating cavity (11), and the heat sink (8) is located below the first electrical component (2) in the height direction of the box body (1).

18. The electrical box according to claim 17, characterized in that: The first electrical device (2) comprises a switching power supply component (26), and the air outlet of the heat sink (8) faces the switching power supply component (26).

19. The electrical box according to claim 17, characterized in that: In the height direction of the box body (1), the distance between the air inlet of the radiator (8) and the bottom wall of the accommodating cavity (11) is greater than 20 mm.

20. An air conditioning unit, characterized in that: It comprises the electrical box as claimed in any one of claims 1 to 19.

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