A compact active filter and its assembly method

Abstract

The invention discloses a compact active filter, comprising an upper shell component, a lower shell component, a front cover component and a rear cover component which are detachably connected; the upper shell component comprises an upper shell and an upper capacitor IGBT board, an upper inductor board and a main control board which are fixed on the top surface of the upper shell, the upper capacitor IGBT board is fixed at the front end of the upper shell, and the main control board and the upper inductor board are fixed side by side at the rear end of the upper shell; the lower shell component comprises a lower shell and a lower capacitor IGBT board, a lower inductor board and a power supply board which are fixed in the lower shell, the lower capacitor IGBT board is fixed at the front end of the lower shell, and the lower inductor board and the power supply board are fixed at the rear end of the lower shell; when the upper shell component is covered on the lower shell component, the upper shell is fixedly connected with the lower shell, the upper capacitor IGBT board is arranged opposite to the lower capacitor IGBT board, and the capacitor group and the radiator of the upper capacitor IGBT board are arranged one by one with the radiator and the capacitor group of the lower capacitor IGBT board respectively; the upper inductor board is arranged opposite to the lower inductor board, and the inductor group of the upper inductor board is staggered with the inductor group of the lower inductor board.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment, and in particular to a compact active filter and an assembling method thereof. Background Art

[0002] At present, for large-capacity active filters above 100A on the market, the internal components are usually installed flat in the shell and then the cover is installed. The flat installation of the internal components takes up a large space and results in a large width, which makes it impossible to install it in many standard distribution cabinets due to insufficient width and cannot be used in many industrial occasions. If the internal components are arranged in a concentrated manner to reduce the space occupied, it will cause internal heat accumulation, causing the internal temperature of the active filter to be too high and cause a malfunction; in addition, the internal components are all installed in the shell, and each component needs to be installed one by one, which has low installation efficiency. Summary of the invention

[0003] The present invention aims at solving the problems and shortcomings of the prior art and provides a novel compact active filter and an assembling method thereof.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present invention provides a compact active filter, comprising an upper shell component, a lower shell component, a front cover component and a rear cover component which are detachably connected;

[0006] The upper shell component includes an upper shell and an upper capacitor IGBT board, an upper inductor board and a main control board fixed to the top surface of the upper shell, the upper capacitor IGBT board is fixed to the front end of the upper shell, the upper inductor board is fixed to the rear end of the upper shell, and the main control board and the upper inductor board are fixed side by side to the rear end of the upper shell;

[0007] The lower shell component includes a lower shell and a lower capacitor IGBT board, a lower inductor board and a power board fixed in the lower shell, wherein the lower capacitor IGBT board is fixed to the front end in the lower shell, the lower inductor board is fixed to the rear end in the lower shell, and the power board is fixed to one side of the rear end in the lower shell;

[0008] The upper capacitor IGBT plate and the lower capacitor IGBT plate are both provided with three capacitor groups and three heat sinks corresponding to phase A, phase B and phase C respectively, and the three capacitor groups and three heat sinks of the upper capacitor IGBT plate and the lower capacitor IGBT plate are sequentially spaced apart;

[0009] The upper inductor plate and the lower inductor plate are both provided with three inductor groups corresponding to phase A, phase B and phase C respectively, and the three inductor groups of the upper inductor plate and the lower inductor plate are arranged in sequence;

[0010] When the upper shell component is covered with the lower shell component, the upper shell is fixedly connected to the lower shell, the upper capacitor IGBT plate is arranged opposite to the lower capacitor IGBT plate, and the three capacitor groups and the three heat sinks of the upper capacitor IGBT plate are arranged one-to-one with the three heat sinks and the three capacitor groups of the lower capacitor IGBT plate respectively; the upper inductor plate is arranged opposite to the lower inductor plate, and the three inductor groups of the upper inductor plate are arranged staggered with the three inductor groups of the lower inductor plate; the main control board and the power board are located on the same side;

[0011] The front cover component comprises a front cover and a fan arranged inside the front cover, and the front cover is provided with an air inlet;

[0012] The rear cover component includes a rear cover and an interface board fixed to the inner side of the rear cover, the interface board is arranged on one side of the rear cover close to the power board and the main control board, and an air outlet is arranged on the rear cover;

[0013] The front cover component and the rear cover component are respectively covered on the front and rear ends of the upper shell component and the lower shell component which are fixedly connected, and the front cover and the rear cover are respectively fixedly connected to the upper shell and the lower shell.

[0014] Optionally, the lower shell is U-shaped, the upper shell is inverted U-shaped, first connecting wings extend upward from both side edges of the lower shell, and the first connecting wings are inserted into the upper shell and connected to the upper shell by screws.

[0015] Optionally, the front edges of the lower shell and the upper shell are both provided with second connecting wings, which are inserted into the front cover and connected to the front cover by screws; the edge of the rear cover is provided with a third connecting wing, which is inserted into the rear ends of the upper shell and the lower shell that are fixedly connected and connected to the lower shell by screws.

[0016] Optionally, protective wings are provided on both sides of the rear end of the lower shell.

[0017] Optionally, an interface hole matching the connection interface of the interface board is provided on the upper side of the rear cover, and when the interface board is fixed to the rear cover, the connection interface passes through the interface hole.

[0018] Optionally, a power terminal is further provided on the rear cover, and the power terminal is connected to a wiring copper bar on the inner side of the rear cover, and the wiring copper bar is bent in a direction close to the power board.

[0019] Optionally, a handle is provided on the front cover.

[0020] Based on the same concept, the present invention also provides an assembly method of the above-mentioned compact active filter, comprising the following steps:

[0021] Providing a lower shell, a lower capacitor IGBT plate, a lower inductor plate and a power supply plate, and sequentially fixing the lower capacitor IGBT plate, the lower inductor plate and the power supply plate to the lower shell by screws to assemble into a lower shell component;

[0022] Providing an upper shell, an upper capacitor IGBT board, an upper inductor board and a main control board, and sequentially fixing the upper capacitor IGBT board, the upper inductor board and the main control board to the upper shell by screws to assemble an upper shell component;

[0023] Providing a front cover and a fan, fixing the fan to the front cover to assemble into a front cover component;

[0024] Provide a rear cover, an interface board, a power terminal and a copper busbar, fix the power terminal and the interface board to the rear cover by screws, connect the copper busbar and the power terminal, and assemble them into a rear cover component;

[0025] Complete the circuit connection between the lower shell component and the upper shell component, cover the upper shell component onto the lower shell component, so that the first connecting wing of the lower shell is inserted into the upper shell and connected to the upper shell by screws;

[0026] After the circuit connection between the main control board and the fan is completed, the front cover component is covered on the front ends of the upper shell component and the lower shell component that are fixedly connected, so that the second connecting wings of the upper shell and the lower shell are inserted into the front cover and connected to the front cover by screws;

[0027] After completing the line connection between the main control board and the interface board, and between the wiring copper busbar and the power board, the rear cover component is covered on the rear ends of the fixedly connected upper shell component and the lower shell component, so that the third connecting wing of the rear cover is inserted into the upper shell and the lower shell and connected to the lower shell by screws, thereby completing the installation.

[0028] The positive and progressive effects of the present invention are:

[0029] The compact active filter provided by the present invention is provided with an upper shell component, a lower shell component, a front cover component and a rear cover component which are detachably connected; the upper shell component comprises an upper shell and an upper capacitor IGBT board, an upper inductor board and a main control board which are fixed to the inner top surface of the upper shell, and the lower shell component comprises a lower shell and a lower capacitor IGBT board, a lower inductor board and a power supply board which are fixed to the inner top surface of the upper shell; when the upper shell component is covered on the lower shell component, the upper shell is fixedly connected to the lower shell, the upper capacitor IGBT board and the lower capacitor IGBT board are arranged opposite to each other, the upper inductor board and the lower inductor board are arranged opposite to each other, and the upper and lower capacitor IGBT boards and the upper and lower inductor boards are installed in a buckled manner, thereby improving the space utilization rate, greatly reducing the outer dimensions of the product and improving the applicability of the product; at the same time, the detachable modular assembly, each component is assembled separately and then assembled into a whole, thereby improving the assembly efficiency.

[0030] Furthermore, the three capacitor groups and three heat sinks of the upper capacitor IGBT board are respectively arranged in one-to-one correspondence with the three heat sinks and three capacitor groups of the lower capacitor IGBT board, and the heat-generating components are arranged in correspondence with the heat sinks to improve the heat dissipation performance; the three inductor groups of the upper inductor board are staggered with the three inductor groups of the lower inductor board, and the heat-generating components are staggered to improve the heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a split compact active filter according to an embodiment of the present invention;

[0032] Figure 2 An exploded diagram of a compact active filter according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic structural diagram of a lower shell component of a compact active filter according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic structural diagram of an upper shell component of a compact active filter according to an embodiment of the present invention;

[0035] Figure 5 It is a schematic structural diagram of a front cover component of a compact active filter according to an embodiment of the present invention;

[0036] Figure 6 It is a schematic structural diagram of a rear cover component of a compact active filter according to an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of the relative positions of an upper capacitor IGBT board and a lower capacitor IGBT board of a compact active filter according to an embodiment of the present invention;

[0038] Figure 8 A side view of the relative positions of an upper capacitor IGBT board and a lower capacitor IGBT board of a compact active filter according to an embodiment of the present invention;

[0039] Fig. 9 A schematic diagram of the relative positions of an upper inductor board, a lower inductor board, a main control board and an interface board of a compact active filter according to an embodiment of the present invention;

[0040] Fig.10 The figure is a side view showing the relative positions of an upper inductor board, a lower inductor board, a main control board and an interface board of a compact active filter according to an embodiment of the present invention.

[0041] In the figure:

[0042] 1. Lower shell component; 11. Lower shell; 111. First connecting wing; 112. Second connecting wing; 113. Protective wing; 12. Lower capacitor IGBT board; 121. Capacitor group; 122. Heat sink; 13. Lower inductor board; 131. Inductor group; 14. Power board;

[0043] 2. Upper shell component; 21. Upper shell; 211. Second connecting wing; 22. Upper capacitor IGBT board; 221. Capacitor group; 222. Radiator; 23. Upper inductor board; 231. Inductor group; 24. Main control board;

[0044] 3. Front cover component; 31. Front cover; 32. Fan; 33. Handle;

[0045] 4. Rear cover component; 41. Rear cover; 411. Third connecting wing; 42. Interface board; 43. Power terminal; 44. Wiring copper busbar. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] See also Figure 1-Figure 10 This embodiment provides a compact active filter, including an upper shell component 2, a lower shell component 1, a front cover component 3 and a rear cover component 4 that are detachably connected.

[0048] The upper shell component 2 includes an upper shell 21 and an upper capacitor IGBT board 22, an upper inductor board 23 and a main control board 24 fixed to the top surface of the upper shell 21. The upper capacitor IGBT board 22 is fixed to the front end of the upper shell 21, the upper inductor board 23 is fixed to the rear end of the upper shell 21, and the main control board 24 is fixed side by side with the upper inductor board 23 at the rear end of the upper shell 21.

[0049] The lower shell component 1 includes a lower shell 11 and a lower capacitor IGBT board 12, a lower inductor board 13 and a power board 14 fixed in the lower shell 11. The lower capacitor IGBT board 12 is fixed at the front end in the lower shell 11, the lower inductor board 13 is fixed at the rear end in the lower shell 11, and the power board 14 is fixed at one side of the rear end in the lower shell 11.

[0050] The upper capacitor IGBT plate 22 and the lower capacitor IGBT plate 12 are both provided with three capacitor groups 221, 121 and three heat sinks 222, 122 corresponding to phase A, phase B and phase C respectively. The three capacitor groups 221, 121 and three heat sinks 222, 122 of the upper capacitor IGBT plate 22 and the lower capacitor IGBT plate 12 are arranged in sequence and spaced apart.

[0051] The upper inductor plate 23 and the lower inductor plate 13 are both provided with three inductor groups 231 and 131 corresponding to the A phase, the B phase and the C phase respectively. The three inductor groups 231 and 131 of the upper inductor plate 23 and the lower inductor plate 13 are arranged in sequence.

[0052] When the upper shell component 2 is covered on the lower shell component 1, the upper shell 21 is fixedly connected to the lower shell 11, the upper capacitor IGBT board 22 is arranged opposite to the lower capacitor IGBT board 12, and the three capacitor groups 221 and the three heat sinks 222 of the upper capacitor IGBT board 22 are respectively arranged one by one with the three heat sinks 122 and the three capacitor groups 121 of the lower capacitor IGBT board 12, and the heat-generating components are arranged corresponding to the heat sinks 122, 222 to improve the heat dissipation performance; the upper inductor plate 23 is arranged opposite to the lower inductor plate 13, and the three inductor groups 231 of the upper inductor plate 23 are staggered with the three inductor groups 131 of the lower inductor plate 13, and the heat-generating components are staggered to improve the heat dissipation performance; the main control board 24 and the power board 14 are located on the same side; the upper and lower capacitor IGBT boards and the upper and lower inductor plates are installed in a buckled manner, which improves the space utilization rate, greatly reduces the product's external dimensions, and improves the applicability of the product.

[0053] The front cover component 3 includes a front cover 31 and a fan 32 disposed inside the front cover 31 . An air inlet is disposed on the front cover 31 .

[0054] The rear cover component 4 includes a rear cover 41 and an interface board 42 fixed to the inner side of the rear cover 41 . The interface board 42 is arranged on one side of the rear cover 41 close to the power board 14 and the main control board 24 . An air outlet is arranged on the rear cover 41 .

[0055] The front cover component 3 and the rear cover component 4 are respectively covered on the front and rear ends of the upper shell component 2 and the lower shell component 1 which are fixedly connected, and the front cover 31 and the rear cover 41 are respectively fixedly connected to the upper shell 21 and the lower shell 11; the upper shell component 2, the lower shell component 1, the front cover component 3 and the rear cover component 4 are detachable modularly assembled, and each component is assembled separately and then assembled into a whole, so as to improve the efficiency of assembly.

[0056] In some embodiments, the lower shell 11 is U-shaped, the upper shell 21 is an inverted U-shape, and first connecting wings 111 extend upward from both side edges of the lower shell 11. The first connecting wings 111 are inserted into the upper shell 21 and connected to the upper shell 21 by screws.

[0057] In some embodiments, the front edges of the lower shell 11 and the upper shell 21 are both provided with second connecting wings 112, 211, which are inserted into the front cover 31 and connected to the front cover 31 by screws; the edge of the rear cover 41 is provided with a third connecting wing 411, which is inserted into the rear ends of the fixedly connected upper shell 21 and lower shell 11 and connected to the lower shell 11 by screws.

[0058] In some embodiments, protective wings 113 are provided on both sides of the rear end of the lower shell 11 to provide protection and prevent the interface board 42 or the power terminal 43 fixed on the back cover 41 from being damaged by colliding with external objects during movement.

[0059] In some embodiments, an interface hole matching the connection interface of the interface board 42 is provided on the upper side of the back cover 41. When the interface board 42 is fixed to the back cover 41, the connection interface passes through the interface hole to facilitate connection with external devices.

[0060] In some embodiments, a power terminal 43 is also provided on the back cover 41 . The power terminal 43 is connected to a wiring copper bus 44 on the inner side of the back cover 41 . The wiring copper bus 44 is bent toward the power board 14 to facilitate connection with the power board 14 .

[0061] In some embodiments, a handle 33 is provided on the front cover 31 to facilitate moving the active filter.

[0062] This embodiment also provides a method for assembling a compact active filter, comprising the following steps:

[0063] Provide a lower shell 11, a lower capacitor IGBT board 12, a lower inductor board 13 and a power board 14, and sequentially fix the lower capacitor IGBT board 12, the lower inductor board 13 and the power board 14 to the lower shell 11 by screws to assemble the lower shell component 1;

[0064] Provide an upper shell 21, an upper capacitor IGBT board 22, an upper inductor board 23 and a main control board 24, and sequentially fix the upper capacitor IGBT board 22, the upper inductor board 23 and the main control board 24 to the upper shell 21 by screws to assemble the upper shell component 2;

[0065] Provide a front cover 31 and a fan 32, and fix the fan 32 to the front cover 31 to assemble the front cover component 3;

[0066] Provide a rear cover 41, an interface board 42, a power terminal 43 and a wiring copper bar 44, fix the power terminal 43 and the interface board 42 to the rear cover 41 by screws, connect the wiring copper bar 44 and the power terminal 43, and assemble into a rear cover component 4;

[0067] After completing the circuit connection between the components of the lower shell component 1 and the upper shell component 2, the upper shell component 2 is covered onto the lower shell component 1, so that the first connecting wing 111 of the lower shell 11 is inserted into the upper shell 21 and connected to the upper shell 21 by screws;

[0068] After the circuit connection between the main control board 24 and the fan 32 is completed, the front cover component 3 is covered on the front ends of the upper shell component 2 and the lower shell component 1 that are fixedly connected, so that the second connecting wings 211 and 112 of the upper shell 21 and the lower shell 11 are inserted into the front cover 31 and connected to the front cover 31 by screws;

[0069] After completing the line connection between the main control board 24 and the interface board 42, and between the wiring copper bus 44 and the power board 14, the rear cover component 4 is covered on the rear ends of the fixedly connected upper shell component 2 and the lower shell component 1, so that the third connecting wing 411 of the rear cover 41 is inserted into the upper shell 21 and the lower shell 11 and connected to the lower shell 11 by screws to complete the installation.

[0070] In summary, the compact active filter provided by the present invention is provided with a detachably connected upper shell component 2, a lower shell component 1, a front cover component 3 and a rear cover component 4; the upper shell component 2 includes an upper shell 21 and an upper capacitor IGBT board 22, an upper inductor board 23 and a main control board 24 fixed to the inner top surface of the upper shell 21, and the lower shell component 1 includes a lower shell 11 and a lower capacitor IGBT board 12, a lower inductor board 13 and a power board 14 fixed in the lower shell 11; when the upper shell component 2 is covered on the lower shell component 1, the upper shell 21 is fixedly connected to the lower shell 11, the upper capacitor IGBT board 22 is arranged opposite to the lower capacitor IGBT board 12, the upper inductor board 23 is arranged opposite to the lower inductor board 13, and the upper and lower capacitor IGBT boards and the upper and lower inductor boards are installed in a buckled manner, which improves space utilization, greatly reduces the external dimensions of the product, and improves the applicability of the product; at the same time, the detachable modular assembly, each component is assembled separately and then assembled into a whole, which improves the assembly efficiency.

[0071] Furthermore, the three capacitor groups 221 and the three heat sinks 222 of the upper capacitor IGBT plate 22 are respectively arranged in one-to-one correspondence with the three heat sinks 122 and the three capacitor groups 121 of the lower capacitor IGBT plate 12, and the heat-generating components are arranged in correspondence with the heat sinks 122 and 222 to improve the heat dissipation performance; the three inductance groups 231 of the upper inductance plate 23 are staggered with the three inductance groups 131 of the lower inductance plate 13, and the heat-generating components are staggered to improve the heat dissipation performance.

[0072] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A compact active filter, characterized in that it comprises a detachably connected upper shell component, a lower shell component, a front cover component and a rear cover component; The upper shell component includes an upper shell and an upper capacitor IGBT board, an upper inductor board and a main control board fixed to the top surface of the upper shell, the upper capacitor IGBT board is fixed to the front end of the upper shell, the upper inductor board is fixed to the rear end of the upper shell, and the main control board and the upper inductor board are fixed side by side to the rear end of the upper shell; The lower shell component includes a lower shell and a lower capacitor IGBT plate, a lower inductor plate and a power supply plate fixed in the lower shell, wherein the lower capacitor IGBT plate is fixed at the front end in the lower shell, the lower inductor plate is fixed at the rear end in the lower shell, and the power supply plate is fixed at one side of the rear end in the lower shell; The upper capacitor IGBT board and the lower capacitor IGBT board are both provided with three capacitor groups and three heat sinks corresponding to the A, B, and C phases respectively, and the three capacitor groups and three heat sinks of the upper and lower capacitor IGBT boards are arranged in sequence and at intervals; The upper inductor plate and the lower inductor plate are both provided with three inductor groups corresponding to phases A, B, and C respectively, and the three inductor groups of the upper inductor plate and the lower inductor plate are arranged in sequence; When the upper shell component is covered on the lower shell component, the upper shell is fixedly connected with the lower shell, the upper capacitor IGBT board is opposite to the lower capacitor IGBT board, so that the three capacitor groups and three heat sinks of the upper capacitor IGBT board correspond to the three heat sinks and three capacitor groups of the lower capacitor IGBT board respectively; the upper inductor board is opposite to the lower inductor board, so that the three inductor groups of the upper inductor board are staggered with the three inductor groups of the lower inductor board; the main control board and the power supply board are located on the same side; The front cover component comprises a front cover and a fan arranged inside the front cover, and an air inlet is arranged on the front cover; The rear cover component includes a rear cover and an interface board fixed to the inner side of the rear cover, the interface board is arranged on the rear cover near the power board and the main control board, and an air outlet is arranged on the rear cover; The front cover component and the rear cover component respectively cover the front end and the rear end of the upper shell component and the lower shell component which are fixedly connected, and the front cover and the rear cover are respectively fixedly connected to the upper shell and the lower shell; The front cover is provided with a handle.

2. The compact active filter according to claim 1, characterized in that The lower shell is in a U-shape, and the upper shell is in an inverted U-shape. First connecting wings extend upward from both side edges of the lower shell. The first connecting wings are inserted into the upper shell and connected to the upper shell by screws.

3. The compact active filter according to claim 1, characterized in that: The front edges of the lower shell and the upper shell are both provided with second connecting wings, which are inserted into the front cover and connected to the front cover by screws; the edge of the rear cover is provided with a third connecting wing, which is inserted into the rear ends of the upper shell and the lower shell that are fixedly connected and connected to the lower shell by screws.

4. The compact active filter according to claim 1, characterized in that: Protection wings are arranged on both sides of the rear end of the lower shell.

5. The compact active filter according to claim 1, characterized in that: An interface hole matching the connection interface of the interface board is arranged on the upper side of the rear cover. When the interface board is fixed to the rear cover, the connection interface passes through the interface hole.

6. The compact active filter according to claim 1, characterized in that: The rear cover is also provided with a power terminal, and the power terminal is connected to a wiring copper bar on the inner side of the rear cover, and the wiring copper bar is bent toward the direction close to the power board.

7. A method for assembling a compact active filter according to any one of claims 1 to 6, characterized in that: The steps include: Providing a lower shell, a lower capacitor IGBT plate, a lower inductor plate and a power supply plate, and sequentially fixing the lower capacitor IGBT plate, the lower inductor plate and the power supply plate to the lower shell by screws to assemble into a lower shell component; Providing an upper shell, an upper capacitor IGBT board, an upper inductor board and a main control board, and sequentially fixing the upper capacitor IGBT board, the upper inductor board and the main control board to the upper shell by screws to assemble into a lower shell component; Providing a front cover and a fan, fixing the fan to the front cover to assemble into a front cover component; Provide a rear cover, an interface board, a power terminal and a wiring copper bar, fix the power terminal and the interface board to the rear cover by screws, connect the wiring copper bar to the power terminal, and assemble into a front cover component; Complete the circuit connection between the lower shell component and the upper shell component, cover the upper shell component onto the lower shell component, so that the first connecting wing of the lower shell is inserted into the upper shell and connected to the upper shell by screws; After the circuit connection between the main control board and the fan is completed, the front cover component is covered on the front ends of the upper shell component and the lower shell component that are fixedly connected, so that the second connecting wings of the upper shell and the lower shell are inserted into the front cover and connected to the front cover by screws; After completing the line connection between the main control board and the interface board, and between the wiring copper busbar and the power board, the rear cover component is covered on the rear ends of the fixedly connected upper shell component and the lower shell component, so that the third connecting wing of the rear cover is inserted into the upper shell and the lower shell and connected to the lower shell by screws, thereby completing the installation.

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