A multi-path power intelligent switching and load balancing power supply device for ring network cabinet

Abstract

The application relates to the field of ring network cabinets, and discloses a multi-path power intelligent switching and load balancing power supply device for a ring network cabinet, which comprises a modular cabinet body, a plurality of multi-path power input modules are arranged in the modular cabinet body, an installation cavity is arranged in the modular cabinet body, a plurality of output power distribution modules are arranged in the installation cavity, the multi-path power input modules and the output power distribution modules are in one-to-one correspondence, a switching control module is arranged in the installation cavity, the switching control module comprises a track arranged along the length direction of the installation cavity, a longitudinal displacement electrical connecting piece is arranged below the track, and the longitudinal displacement electrical connecting piece moves along the length direction of the track. According to the application, the longitudinal displacement electrical connecting piece can be connected with the output power distribution modules at different positions by moving along the track, that is, the load can be connected with different storage batteries, power supply quick switching on the basis of multiple power sources can be realized, and the application is convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of ring main units, specifically a multi-source intelligent switching and load balancing power supply device for ring main units. Background Technology

[0002] In modern medium and low voltage power distribution systems, ring main units (RNBs) are core equipment ensuring reliable switching of distribution lines, rational power distribution, and line fault protection. They are widely used in various power scenarios, including urban power distribution network construction, industrial plant power supply, commercial buildings, residential communities, and distributed renewable energy access. With the accelerated pace of intelligent upgrades in power systems, the number of electrical devices at distribution terminals continues to increase. Load operation is characterized by long-term continuous operation, dynamic load fluctuations, and stringent requirements for power supply stability. The power supply safety level, power supply continuity, and load distribution rationality of RNBs directly affect the equipment operating status and power supply safety of the entire distribution branch, placing higher demands on the fault-tolerant operation capability of the power distribution system. Currently, most conventional RNBs on the market use a single-power-source independent power supply architecture for auxiliary and load power supply systems. The cabinet only has a single power supply to power all downstream load devices, without a multi-power backup system or automated power switching strategies and dynamic load balancing control mechanisms. The actual operating conditions of ring main units are quite complex. The internal space of the cabinet is sealed with limited heat dissipation conditions, and it is in a state of continuous energization for a long time. It is affected by multiple factors such as harmonic interference from the power grid, voltage amplitude fluctuations, instantaneous inrush current, changes in ambient temperature, and long-term aging and wear of the power supply itself. A single power supply is very prone to abnormal phenomena such as output voltage deviation, current fluctuation disorder, and excessive temperature rise of the whole unit. Therefore, ring main units have the following defects when used: The single power supply mode lacks multiple power backup backups. When the main power supply experiences faults such as unstable voltage, abnormal current, or overheating, the system cannot automatically complete the rapid switching operation of the power supply circuit and cannot promptly activate the backup power supply to take over the power supply. Summary of the Invention

[0003] In view of the above situation and to overcome the defects of the prior art, the present invention provides a multi-power intelligent switching and load balancing power supply device for ring main units, which effectively solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multi-source power intelligent switching and load balancing power supply device for ring network cabinets, comprising a modular cabinet, wherein multiple multi-source power input modules are provided inside the modular cabinet, an installation cavity is provided inside the modular cabinet, multiple output power distribution modules are provided inside the installation cavity, the multi-source power input modules and the output power distribution modules correspond one-to-one, and a switching control module is provided inside the installation cavity. The switching control module includes a track set along the length of the mounting cavity, and a longitudinal moving electrical connector is set below the track, which moves along the length of the track. The longitudinally moving electrical connector includes a mounting plate, on which three electrical connectors are provided, namely the first connector, the second connector, and the third connector; The power connector includes a connector body fixedly mounted on a mounting plate, and a conductive rod body fixedly mounted on the connector body. A voltage monitoring sensor is connected in series between the ends of the conductive rod bodies on the first connector and the conductive rod bodies on the second connector. A current monitoring sensor is connected in series between the conductive rod bodies on the first connector and the conductive rod bodies on the third connector. A temperature monitoring sensor is located in the middle of the bottom wall of the mounting plate.

[0005] Preferably, a sliding table is provided above the mounting plate, a lifting mechanism is provided between the sliding table and the mounting plate, the sliding table is slidably connected to the track, and a linear motion module is provided between the track and the sliding table.

[0006] Preferably, the modular cabinet is provided with an external positive terminal connection slot and an external negative terminal connection slot, and a load is connected in series between the external positive terminal connection slot and the external negative terminal connection slot.

[0007] Preferably, the multi-channel power input module includes multiple power storage cavities equidistantly arranged along the length of the mounting cavity. A battery is installed in each power storage cavity. An mounting slot is provided on the front of each power storage cavity. A positive terminal connection slot and a negative terminal connection slot are symmetrically arranged on the front of each power storage cavity. The positive terminal connection slot and the negative terminal connection slot are electrically connected to the positive and negative terminals of the battery, respectively.

[0008] Preferably, the output power distribution module includes multiple power distribution stations arranged along the length of the mounting cavity, with each power distribution station corresponding to a power storage cavity, and the power distribution stations are located below the track.

[0009] Preferably, a heat-conducting column is fixedly installed on the side of the distribution station near the power storage cavity. One end of the heat-conducting column is inserted into the battery casing through a mounting slot. A heat-conducting plate is provided on the top wall of the distribution station, and the other end of the heat-conducting column is fixed to the heat-conducting plate.

[0010] Preferably, the top of the distribution radio is provided with three power connection slots, including a first slot, a second slot and a third slot, wherein the first slot corresponds to the first plug, the second slot corresponds to the second plug and the third slot corresponds to the third plug.

[0011] Preferably, the distribution radio station has a positive terminal block and a negative terminal block symmetrically arranged on one side near the power storage cavity, wherein the positive terminal block and the negative terminal block are respectively inserted into the inner positive terminal slot and the inner negative terminal slot, and the other side of the distribution radio station has a positive terminal and a negative terminal symmetrically arranged, and the positive terminal and the negative terminal are electrically connected to the outer positive terminal slot and the outer negative terminal slot respectively through wires.

[0012] Preferably, the power connection slot includes a slot body disposed on the top of the distribution station, with contacts symmetrically arranged at both ends of the slot body. The contact at one end of the first slot is electrically connected to the positive terminal block, the contact at the other end of the second slot is electrically connected to the positive terminal post, and the contacts at both ends of the third slot are electrically connected to the negative terminal block and the negative terminal post, respectively.

[0013] Preferably, when the first plug is inserted into the first slot, one end of the conductive rod is energized with the contact point on the first slot that is electrically connected to the positive terminal block; when the second plug is inserted into the second slot, one end of the conductive rod is energized with the contact point on the second slot that is electrically connected to the positive terminal; and when the third plug is inserted into the third slot, both ends of the conductive rod are energized with the contacts on both sides of the third slot.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (1) In this invention, the multi-channel power input module and the output power distribution module correspond one-to-one. After the longitudinal moving connector is connected to the output power distribution module, the corresponding battery and the load can form a circuit to supply power to the load. The longitudinal moving connector moves along the track so that it can be connected to the output power distribution module at different positions, thereby realizing the connection between the load and different batteries. This enables rapid switching of power supply based on multiple power sources, making it convenient to use. (2) In this invention, the first plug is inserted into the first slot, the second plug is inserted into the second slot, and the third plug is inserted into the third slot, thereby completing the electrical connection between the battery and the load. At the same time, the voltage monitoring sensor is connected in parallel with the load, and the current monitoring sensor is connected in series with the load, which facilitates the monitoring of the voltage stability and current stability of the battery output, and facilitates intelligent switching when voltage or current instability occurs, ensuring balanced and stable power supply to the load. (3) In this invention, the positive terminal block and the negative terminal block are respectively inserted into the inner positive terminal slot and the inner negative terminal slot, and the heat-conducting column is inserted into the mounting slot. This facilitates power connection and improves installation stability. At the same time, the battery temperature is transferred to the temperature monitoring sensor through the heat-conducting column and the heat-conducting plate, which facilitates monitoring of the battery temperature, enables early warning, and ensures normal load conditions. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0016] In the attached diagram: Figure 1 This is a schematic diagram of the multi-source intelligent switching and load balancing power supply device for ring main units according to the present invention. Figure 2 This is a schematic diagram of the multi-channel power input module structure of the present invention; Figure 3 This is a schematic diagram of the output power distribution module structure of the present invention; Figure 4 This is a schematic diagram of the switching control module structure of the present invention; Figure 5 This is a schematic diagram of the connection structure between the sliding stage and the longitudinal moving electrical connector of the present invention; Figure 6 This is a schematic diagram of the longitudinally moving electrical connector structure of the present invention; In the diagram: 1. Modular cabinet; 2. External positive terminal connector; 3. External negative terminal connector; 4. Mounting cavity; 5. Multi-channel power input module; 51. Power storage cavity; 52. Battery; 53. Mounting slot; 54. Internal positive terminal connector; 55. Internal negative terminal connector; 6. Output power distribution module; 61. Power distribution station; 62. Mounting heat-conducting pillar; 63. Heat-conducting plate; 64. Positive terminal block; 65. Negative terminal block; 66. Positive terminal; 67. Negative terminal; 68. Power connection slot; 68a. First slot; 68 b. Second slot; 68c. Third slot; 681. Slot body; 682. Contact; 7. Switching control module; 71. Rail; 72. Sliding table; 73. Linear movement module; 74. Lifting mechanism; 75. Longitudinal contact component; 751. Mounting plate; 752. Contact plug; 752a. First plug; 752b. Second plug; 752c. Third plug; 7521. Plug body; 7522. Conductive rod body; 753. Voltage monitoring sensor; 754. Current monitoring sensor; 755. Temperature monitoring sensor. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] Example 1, by Figure 1The present invention relates to a multi-source intelligent switching and load balancing power supply device for a ring main unit, comprising a modular cabinet 1, wherein multiple multi-source power input modules 5 are arranged inside the modular cabinet 1, and an installation cavity 4 is arranged inside the modular cabinet 1. Multiple output power distribution modules 6 are arranged inside the installation cavity 4, with each multi-source power input module 5 corresponding to one output power distribution module 6. A switching control module 7 is arranged inside the installation cavity 4. An external positive terminal connection slot 2 and an external negative terminal connection slot 3 are arranged on the modular cabinet 1, and a load is connected in series between the external positive terminal connection slot 2 and the external negative terminal connection slot 3.

[0019] Depend on Figures 1-2 The multi-channel power input module 5 includes multiple power storage cavities 51 equidistantly arranged along the length of the mounting cavity 4. A battery 52 is installed in each power storage cavity 51. A mounting slot 53 is provided on the front of the power storage cavity 51. A positive terminal connection slot 54 and a negative terminal connection slot 55 are symmetrically arranged on the front of the power storage cavity 51. The positive terminal connection slot 54 and the negative terminal connection slot 55 are electrically connected to the positive and negative terminals of the battery 52, respectively.

[0020] Depend on Figure 3 The output power distribution module 6 includes multiple power distribution stations 61 arranged along the length of the mounting cavity 4. Each power distribution station 61 corresponds to a power storage cavity 51. A heat-conducting mounting column 62 is fixedly installed on the side of each power distribution station 61 closest to the power storage cavity 51. One end of the heat-conducting mounting column 62 is inserted into a mounting slot 53 and is in close contact with the battery housing 52. A heat-conducting plate 63 is provided on the top wall of the power distribution station 61, and the other end of the heat-conducting mounting column 62 is fixed to the heat-conducting plate 63. On one side of the power storage chamber 51, a positive terminal block 64 and a negative terminal block 65 are symmetrically arranged. The positive terminal block 64 and the negative terminal block 65 are respectively inserted into the inner positive terminal slot 54 and the inner negative terminal slot 55. On the other side of the distribution station 61, a positive terminal post 66 and a negative terminal post 67 are symmetrically arranged. The positive terminal post 66 and the negative terminal post 67 are electrically connected to the outer positive terminal slot 2 and the outer negative terminal slot 3 respectively through wires. The top of the distribution radio 61 is provided with three power connection slots 68, including a first slot 68a, a second slot 68b, and a third slot 68c. Each power connection slot 68 includes a slot body 681 located on the top of the distribution radio 61. Contacts 682 are symmetrically arranged at both ends of the slot body 681. The contact 682 at one end of the first slot 68a is electrically connected to the positive terminal block 64. The contact 682 at the other end of the second slot 68b is electrically connected to the positive terminal 66. The contacts 682 at both ends of the third slot 68c are electrically connected to the negative terminal block 65 and the negative terminal 67, respectively.

[0021] Depend on Figures 4-5The switching control module 7 includes a track 71 arranged along the length of the mounting cavity 4. A longitudinal moving connector 75 is arranged below the track 71 and moves along the length of the track 71. A sliding table 72 is arranged above the mounting plate 751. A lifting mechanism 74 is arranged between the sliding table 72 and the mounting plate 751. The sliding table 72 is slidably connected to the track 71. A linear moving module 73 is arranged between the track 71 and the sliding table 72. The multi-channel power input module 5 and the output power distribution module 6 correspond one-to-one. After the longitudinal moving connector 75 is connected to the output power distribution module 6, the corresponding battery 52 can form a circuit with the load to supply power to the load. By moving the longitudinal moving connector 75 along the track 71, the longitudinal moving connector 75 can be connected to the output power distribution module 6 at different positions, that is, the load can be connected to different batteries 52, realizing fast power switching on the basis of multiple power sources, which is convenient to use. Depend on Figure 6 The longitudinally moving electrical connector 75 includes a mounting plate 751, on which three electrical connector blocks 752 are provided. These three electrical connector blocks 752 are designated as a first connector block 752a, a second connector block 752b, and a third connector block 752c. Each electrical connector block 752 includes a connector body 7521 fixedly mounted on the mounting plate 751. A conductive rod 7522 is fixedly mounted on the connector body 7521. A voltage monitoring sensor 753 is connected in series between the ends of the conductive rods 7522 on the first connector block 752a and the conductive rods 7522 on the third connector block 752c. A current monitoring sensor 754 is connected in series between the conductive rods 7522 on the second plug 752b. The first plug 752a is inserted into the first slot 68a, the second plug 752b is inserted into the second slot 68b, and the third plug 752c is inserted into the third slot 68c, completing the electrical connection between the battery 52 and the load. At the same time, the voltage monitoring sensor 753 is connected in parallel with the load, and the current monitoring sensor 754 is connected in series with the load, which facilitates the monitoring of the voltage and current stability of the battery 52 output, and facilitates intelligent switching when voltage or current instability occurs, ensuring a balanced and stable power supply to the load. A temperature monitoring sensor 755 is installed in the middle of the bottom wall of the mounting plate 751. The positive terminal block 64 and the negative terminal block 65 are inserted into the inner positive terminal slot 54 and the inner negative terminal slot 55, respectively. A heat-conducting pillar 62 is inserted into the mounting slot 53, facilitating power connection and improving installation stability. Simultaneously, the temperature of the battery 52 is transferred to the temperature monitoring sensor 755 through the heat-conducting pillar 62 and the heat-conducting plate 63, facilitating monitoring of the temperature of the powered battery 52, enabling early warning, and ensuring normal load operation. When the first insert 752a is inserted into the first slot 68a, one end of the conductive rod 7522 is energized to the contact 682 on the first slot 68a that is electrically connected to the positive terminal block 64. When the second insert 752b is inserted into the second slot 68b, one end of the conductive rod 7522 is energized to the contact 682 on the second slot 68b that is electrically connected to the positive terminal post 66. When the third insert 752c is inserted into the third slot 68c, both ends of the conductive rod 7522 are energized to the contacts 682 on both sides of the third slot 68c.

[0022] Working principle: In operation, in its original state, the longitudinally moving contactor 75 is positioned above the first distribution station 61. The first plug 752a is inserted into the first slot 68a, the second plug 752b into the second slot 68b, and the third plug 752c into the third slot 68c. One end of the conductive rod 7522 is energized to the contact 682 on the first slot 68a, which is electrically connected to the positive terminal block 64. The other end of the conductive rod 7522 is energized to the contact 682 on the second slot 68b, which is electrically connected to the positive terminal post 66. The two ends of the conductive rod 7522... The terminals are respectively connected to the contacts 682 on both sides of the third slot 68c, and the positive terminal block 64 and the negative terminal block 65 are respectively inserted into the inner positive terminal slot 54 and the inner negative terminal slot 55, so that they are electrically connected to the positive and negative terminals on the battery 52, and the positive terminal 66 and the negative terminal 67 are respectively electrically connected to the outer positive terminal slot 2 and the outer negative terminal slot 3, so that the outer positive terminal slot 2 and the outer negative terminal slot 3 are connected to the positive and negative terminals on the battery 52, thereby turning on the external circuit of the load and enabling the first battery 52 to supply power to the load; A voltage monitoring sensor 753 is connected in series between the ends of the conductive rod 7522 on the first plug 752a and the conductive rod 7522 on the third plug 752c. A current monitoring sensor 754 is connected in series between the conductive rod 7522 on the first plug 752a and the conductive rod 7522 on the second plug 752b. Thus, the voltage monitoring sensor 753 is connected in parallel with the load to facilitate monitoring the voltage of the load, and the current monitoring sensor 754 is connected in series with the load to facilitate monitoring the current flowing through the load. The heat-conducting column 62 is installed in close contact with the battery 52. ​​After the mounting plate 751 is installed, the temperature monitoring sensor 755 is in close contact with the heat-conducting sheet 63, thereby enabling real-time monitoring of the temperature of the battery 52 and facilitating monitoring of the power output status of the battery 52. When unstable current or voltage occurs, or the battery 52 temperature is too high, the controller drives the mounting plate 751 to move upward through the lifting mechanism 74, so that the longitudinal moving connector 75 is separated from the output power distribution module 6. Then, through the linear moving module 73, the longitudinal moving connector 75 is driven to move along the length of the track 71, so that the longitudinal moving connector 75 moves above the adjacent output power distribution module 6. Then, through the lifting mechanism 74, the longitudinal moving connector 75 is connected to the output power distribution module 6 below, so that the load is connected to the external circuit of the second battery 52, realizing rapid power switching and convenient use.

[0023] Position sensors are installed on the mounting plate 751 and the power storage cavity 51 to determine the movement position of the mounting plate 751, which facilitates positioning. This application uses a mechanical plug-in interface to replace the traditional electrical switch, avoiding the problems of arcing, burning, and contact oxidation failure of the electrical switch under high current conditions. It is suitable for high power output scenarios of batteries, has a longer service life, and the mechanical hard connection has more stable conductive contact, lower voltage drop, and higher conductivity reliability.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-source intelligent switching and load balancing power supply device for ring main units, comprising a modular cabinet (1), characterized in that: The modular cabinet (1) is equipped with multiple multi-channel power input modules (5), the modular cabinet (1) is equipped with an installation cavity (4), the installation cavity (4) is equipped with multiple output power distribution modules (6), the multi-channel power input modules (5) and the output power distribution modules (6) correspond one-to-one, and the installation cavity (4) is equipped with a switching control module (7). The switching control module (7) includes a track (71) arranged along the length of the mounting cavity (4), and a longitudinal moving contact (75) is arranged below the track (71). The longitudinal moving contact (75) moves along the length of the track (71). The longitudinally moving electrical connector (75) includes a mounting plate (751), on which three electrical connectors (752) are provided, namely the first connector (752a), the second connector (752b) and the third connector (752c). The power connector (752) includes a connector body (7521) fixedly mounted on a mounting plate (751). A conductive rod body (7522) is fixedly mounted on the connector body (7521). A voltage monitoring sensor (753) is connected in series between the ends of the conductive rod body (7522) on the first connector (752a) and the conductive rod body (7522) on the third connector (752c). A current monitoring sensor (754) is connected in series between the conductive rod body (7522) on the first connector (752a) and the conductive rod body (7522) on the second connector (752b). A temperature monitoring sensor (755) is provided in the middle of the bottom wall of the mounting plate (751). The top of the distribution radio (61) is provided with three power connection slots (68), including a first slot (68a), a second slot (68b), and a third slot (68c). The first slot (68a) corresponds to the first plug (752a), the second slot (68b) corresponds to the second plug (752b), and the third slot (68c) corresponds to the third plug (752c). The distribution radio (61) is symmetrically provided with a positive terminal block (64) and a negative terminal block (652a) on the side near the power storage cavity (51). A positive terminal block (64) and a negative terminal block (65) are respectively inserted into an inner positive terminal slot (54) and an inner negative terminal slot (55). A positive terminal (66) and a negative terminal (67) are symmetrically arranged on the other side of the distribution radio (61). The positive terminal (66) and the negative terminal (67) are electrically connected to an outer positive terminal slot (2) and an outer negative terminal slot (3) respectively via wires. The power connection slot (68) includes a slot body (64) located on the top of the distribution radio (61). 81), contacts (682) are symmetrically arranged at both ends of the slot body (681), wherein the contact (682) at one end of the first slot (68a) is electrically connected to the positive terminal block (64), the contact (682) at the other end of the second slot (68b) is electrically connected to the positive terminal post (66), and the contacts (682) at both ends of the third slot (68c) are electrically connected to the negative terminal block (65) and the negative terminal post (67), respectively; when the first plug (752a) is inserted into the first slot (68a), the conductive rod body ( One end of the conductive rod (7522) is energized to the contact (682) on the first slot (68a) which is electrically connected to the positive terminal block (64). When the second plug (752b) is inserted into the second slot (68b), one end of the conductive rod (7522) is energized to the contact (682) on the second slot (68b) which is electrically connected to the positive terminal post (66). When the third plug (752c) is inserted into the third slot (68c), both ends of the conductive rod (7522) are energized to the contacts (682) on both sides of the third slot (68c). The modular cabinet (1) is provided with an external positive terminal connection slot (2) and an external negative terminal connection slot (3), and a load is connected in series between the external positive terminal connection slot (2) and the external negative terminal connection slot (3); The multi-channel power input module (5) includes multiple power storage cavities (51) equidistantly arranged along the length of the mounting cavity (4). The front of the power storage cavity (51) is symmetrically provided with an inner positive terminal connection slot (54) and an inner negative terminal connection slot (55). The output power distribution module (6) includes multiple distribution stations (61) arranged along the length of the mounting cavity (4), and the distribution stations (61) are located below the track (71).

2. The multi-source intelligent switching and load balancing power supply device for ring main units according to claim 1, characterized in that: A sliding table (72) is provided above the mounting plate (751). A lifting mechanism (74) is provided between the sliding table (72) and the mounting plate (751). The sliding table (72) is slidably connected to the track (71). A linear movement module (73) is provided between the track (71) and the sliding table (72).

3. The multi-source intelligent switching and load balancing power supply device for ring main units according to claim 2, characterized in that: A battery (52) is installed inside the power storage cavity (51). An installation slot (53) is provided on the front of the power storage cavity (51). The positive terminal connection slot (54) and the negative terminal connection slot (55) are electrically connected to the positive and negative terminals of the battery (52), respectively.

4. The intelligent switching and load balancing power supply device for multi-source power supply in a ring main unit according to claim 3, characterized in that: The radio (61) and the power storage chamber (51) are in one-to-one correspondence.

5. A multi-source intelligent switching and load balancing power supply device for ring main units according to claim 4, characterized in that: The distribution radio (61) is fixedly installed with a heat-conducting column (62) on the side near the power storage cavity (51). One end of the heat-conducting column (62) is inserted into the mounting slot (53) and is in close contact with the battery (52) housing. A heat-conducting plate (63) is provided on the top wall of the distribution radio (61), and the other end of the heat-conducting column (62) is fixed to the heat-conducting plate (63).

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