CN221043659U - High-current three-phase alternating current rectifying cabinet group with efficient heat dissipation capability - Google Patents

High-current three-phase alternating current rectifying cabinet group with efficient heat dissipation capability Download PDF

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Publication number
CN221043659U
CN221043659U CN202323071732.3U CN202323071732U CN221043659U CN 221043659 U CN221043659 U CN 221043659U CN 202323071732 U CN202323071732 U CN 202323071732U CN 221043659 U CN221043659 U CN 221043659U
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China
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water
cabinet
busbar
phase
negative
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Chinese (zh)
Inventor
杨磊
刘志祥
裴金鑫
朱小林
李中志
胡顺
张华云
戴雨航
于永瑞
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Chongqing Kekai Qianwei Electric Co ltd
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Chongqing Kekai Qianwei Electric Co ltd
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Abstract

The utility model discloses a high-current three-phase alternating current rectifying cabinet group with high-efficiency heat dissipation capacity, which comprises a rectifying cabinet and a water cooling device arranged in the rectifying cabinet, wherein at least one anode busbar cooling water way is arranged in an anode copper busbar, and at least one cathode busbar cooling water way is arranged in a cathode copper busbar. By adopting the high-current three-phase alternating current rectifying cabinet group with high-efficiency heat dissipation capability, the positive electrode busbar cooling water channel is directly designed on the positive electrode busbar, the negative electrode busbar cooling water channel is directly designed on the negative electrode busbar, and the positive electrode busbar cooling water channel and the negative electrode busbar cooling water channel are connected into the water cooling device through the water pipe, so that the positive electrode busbar and the negative electrode busbar can be efficiently dissipated by utilizing cooling water, the problem that the temperatures of the positive electrode busbar and the negative electrode busbar are too high in working is solved, and potential safety hazards are eliminated.

Description

High-current three-phase alternating current rectifying cabinet group with efficient heat dissipation capability
Technical Field
The utility model belongs to the technical field of electrical equipment, and particularly relates to a high-current three-phase alternating current rectifying cabinet group with high-efficiency heat dissipation capability.
Background
The rectifier cabinet is a power device for converting alternating current into direct current, and adopts an in-phase anti-parallel three-phase bridge rectifier circuit structure, and the basic principle is that two identical three-phase bridge rectifiers are connected, and two groups of opposite-polarity leads from a secondary winding to a rectifier arm are arranged together as close as possible according to the structure with identical phase sequences and 180 degrees phase difference and positive and negative direct current rows.
Under the condition that the electric elements in the rectifying cabinet work for a long time, a large amount of heat can be generated, so that a cooling device is required to be arranged for radiating the inside of the rectifying cabinet. At present, most rectifying cabinets adopt an air cooling heat dissipation mode, and heat in the rectifying cabinets is discharged through arranging a plurality of exhaust fans. For a high-power high-voltage three-phase alternating current rectifier cabinet, the heat dissipation capacity of air cooling heat dissipation is insufficient, and the problem of overhigh internal temperature often occurs.
Therefore, a water-cooled high-voltage three-phase alternating current rectifier cabinet is generated in the market, and the heat generated by the positive three-phase rectifier bridge group and the negative three-phase rectifier bridge group can be effectively taken away by matching with a silicon controlled rectifier water-cooled radiator. However, in actual use, it is found that the positive copper busbar and the negative copper busbar can generate a large amount of heat under the long-term working condition, and the water cooling radiator cannot be directly installed to conduct water cooling heat dissipation on the positive copper busbar and the negative copper busbar, so that the temperature of the positive copper busbar and the negative copper busbar is too high during working, and potential safety hazards exist.
Solving the above problems is urgent.
Disclosure of utility model
In view of the above, the utility model provides a high-current three-phase alternating current rectification cabinet group with high-efficiency heat dissipation capability, so as to solve the problem that the positive copper busbar and the negative copper busbar cannot conduct water cooling heat dissipation in the prior art.
The technical scheme is as follows:
The high-current three-phase alternating current rectifying cabinet group with high-efficiency heat dissipation capacity comprises a rectifying cabinet and a water cooling device arranged in the rectifying cabinet, wherein the water cooling device comprises a water inlet pipe and a water outlet pipe, a plurality of water inlet nozzles are arranged on the water inlet pipe, the water outlet pipe is provided with water outlet nozzles with the same number as that of the water inlet nozzles, two positive three-phase rectifying bridge groups, two negative three-phase rectifying bridge groups and a plurality of connecting copper bars are arranged in the rectifying cabinet, a plurality of silicon controlled rectifier water cooling radiators are arranged on the positive three-phase rectifying bridge groups and the negative three-phase rectifying bridge groups, a first water inlet joint and a first water outlet joint of each silicon controlled rectifier water cooling radiator are respectively communicated with the corresponding water inlet nozzles and water outlet nozzles through water pipes, each connecting copper bar is respectively electrically connected with the corresponding positive three-phase rectifying bridge groups and negative three-phase rectifying bridge groups, each positive three-phase rectifying bridge group is respectively electrically connected with an independent positive copper busbar, or is electrically connected with the same positive copper busbar, each negative three-phase rectifying bridge group is respectively connected with one copper busbar, each negative three-phase rectifying bridge group is respectively connected with at least one copper busbar, each negative copper busbar is respectively connected with at least one water inlet nozzle is correspondingly connected with at least one water inlet nozzle and one water outlet nozzle, each water inlet nozzle is respectively connected with at least one water inlet nozzle is electrically connected with at least one water inlet nozzle respectively, the third water inlet joint and the third water outlet joint of each negative busbar cooling water way are respectively communicated with the corresponding water inlet water nozzle and the corresponding water outlet water nozzle through water pipes.
Compared with the prior art, the utility model has the beneficial effects that:
The high-current three-phase alternating current rectifying cabinet group with high-efficiency heat dissipation capability provided by the utility model has the advantages that the positive electrode busbar cooling waterway is directly arranged on the positive electrode copper busbar, the negative electrode busbar cooling waterway is directly arranged on the negative electrode copper busbar, and the positive electrode busbar cooling waterway and the negative electrode busbar cooling waterway are connected into the water cooling device through the water pipe, so that the positive electrode copper busbar and the negative electrode copper busbar can be efficiently dissipated by utilizing cooling water, the high-efficiency heat dissipation cabinet group is especially suitable for the position of parallel current, the problem of overhigh temperature of the positive electrode copper busbar and the negative electrode copper busbar during working is solved, and the potential safety hazard is eliminated,
Drawings
FIG. 1 is a schematic diagram of a high voltage three phase AC power rectifier cabinet set;
FIG. 2 is a schematic diagram of the high voltage three phase AC power rectifier cabinet assembly with the cabinet door removed;
FIG. 3 is a schematic diagram of the mating relationship of one of the positive three-phase rectifier bridge set, the negative three-phase rectifier bridge set, the connection copper, the thyristor water-cooled radiator, the positive copper busbar and the negative copper busbar at one view angle;
FIG. 4 is a schematic diagram of the mating relationship of the positive three-phase rectifier bridge set, the negative three-phase rectifier bridge set, the connection copper, the thyristor water-cooled radiator, the positive copper busbar and the negative copper busbar at another view angle;
FIG. 5 is a cross-sectional view of a positive copper busbar;
fig. 6 is a cross-sectional view of a negative copper busbar.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 6, the high-current three-phase alternating current rectifying cabinet group with high-efficiency heat dissipation capability mainly comprises a rectifying cabinet 2 and a water cooling device 3 arranged in the rectifying cabinet 2.
Referring to fig. 2, the water cooling device 3 includes a water inlet pipe 31 and a water outlet pipe 32, and the water inlet pipe 31 and the water outlet pipe 32 are fixedly installed in the rectifying cabinet 2 and are close to the bottom of the rectifying cabinet 2. One end of the water inlet pipe 31 is sealed, the other end of the water inlet pipe 31 is communicated with a water outlet of the cooling water radiator through a pipeline, a plurality of water inlet nozzles 311 are arranged on the water inlet pipe 31, and the water inlet nozzles 311 are distributed on the water inlet pipe 31 along the length direction of the water inlet pipe 31.
One end of the water outlet pipe 32 is sealed, the other end of the water outlet pipe 32 is communicated with a water inlet of the cooling water radiator through a pipeline, high-temperature cooling water is conveyed to the cooling water radiator through the water outlet pipe 32 for cooling, and the cooled cooling water is conveyed back to the water inlet pipe 31. The water outlet pipe 32 is provided with water outlet nozzles 321 which are equal to the water inlet nozzles 311 in number, and each water outlet nozzle 321 is distributed on the water outlet pipe 32 along the length direction of the water outlet pipe 32.
Referring to fig. 2-4, two positive three-phase rectifying bridge groups 21, two negative three-phase rectifying bridge groups 22 and a plurality of connection copper bars 23 are disposed in the rectifying cabinet 2, and each connection copper bar 23 is electrically connected with the corresponding positive three-phase rectifying bridge group 21 and negative three-phase rectifying bridge group 22, so that the phase lines of the positive three-phase rectifying bridge group 21 are electrically connected with the phase lines of the negative three-phase rectifying bridge group 22.
The positive three-phase rectifier bridge set 21 and the negative three-phase rectifier bridge set 22 are respectively provided with a plurality of silicon controlled rectifier water-cooling radiators 28, and a first water inlet connector 281 and a first water outlet connector 282 of each silicon controlled rectifier water-cooling radiator 28 are respectively communicated with a corresponding water inlet nozzle 311 and a corresponding water outlet nozzle 321 through water pipes, so that the silicon controlled rectifier water-cooling radiator 28 has extremely high heat dissipation performance.
Referring to fig. 3-6, each positive three-phase rectifier bridge set 21 is electrically connected to one independent positive copper busbar 24, or is electrically connected to the same positive copper busbar 24, and each negative three-phase rectifier bridge set 22 is electrically connected to one independent negative copper busbar 25, or is electrically connected to the same negative copper busbar 25. Each positive copper busbar 24 is electrically connected to a corresponding positive copper busbar 26, and each negative copper busbar 25 is electrically connected to a corresponding negative copper busbar 27.
The key point of the application is that at least one positive busbar cooling water channel 241 is arranged in the positive busbar 24, the second water inlet joint 242 and the second water outlet joint 243 of each positive busbar cooling water channel 241 are respectively communicated with the corresponding water inlet water nozzle 311 and the corresponding water outlet water nozzle 321 through water pipes, at least one negative busbar cooling water channel 251 is arranged in the negative busbar 25, and the third water inlet joint 252 and the third water outlet joint 253 of each negative busbar cooling water channel 251 are respectively communicated with the corresponding water inlet water nozzle 311 and the corresponding water outlet water nozzle 321 through water pipes.
Therefore, through directly setting up anodal female row cooling water route 241 directly on anodal copper busbar 24, directly set up anodal female row cooling water route 251 directly on negative pole copper busbar 25, and connect anodal female row cooling water route 241 and negative pole female row cooling water route 251 into water cooling device 3 through the water pipe, anodal female row cooling water route 241 and anodal copper busbar 24, and negative pole female row cooling water route 251 and negative pole copper busbar 25 all integrated into one piece when producing, fully guaranteed product bulk strength, utilize cooling water to carry out the high-efficient heat dissipation to anodal copper busbar 24 and negative pole copper busbar 25 simultaneously, the high temperature problem of anodal copper busbar 24 and negative pole copper busbar 25 has been solved during operation, the potential safety hazard has been eliminated.
In this embodiment, since the bottoms of the two positive three-phase rectifier bridge groups 21 are electrically connected to the same positive copper busbar 24, the positive copper busbar 24 extends along the length direction of the rectifier cabinet 2, and the length of the positive copper busbar 24 is very long. Therefore, referring to fig. 5, the positive copper busbar 24 has at least two positive busbar cooling water paths 241 penetrating along the length direction thereof, and two ends of the positive copper busbar 24 are respectively provided with a second water inlet joint 242 and a second water outlet joint 243 communicating with the corresponding positive busbar cooling water paths 241. Through set up many anodal female row cooling water routes 241 in the anodal copper busbar 24 that length is very long, can double the heat dispersion to anodal copper busbar 24, the processing of anodal female row cooling water route 241 is simple and convenient simultaneously.
In this embodiment, since the bottoms of the two negative three-phase rectifier bridge groups 22 are respectively electrically connected with one negative copper busbar 25, the two negative copper busbars 25 extend in the length direction of the uniform current cabinet 2, and the lengths of the negative copper busbars 25 are shorter. Therefore, the negative copper busbar 25 is provided with a negative busbar cooling water path 251 having a "U" shape, and one end of the negative copper busbar 25 is provided with a third water inlet connector 252 and a third water outlet connector 253 which are communicated with the corresponding negative busbar cooling water path 251. Each negative electrode copper busbar 25 is provided with only one negative electrode busbar cooling water path 251, but the negative electrode busbar cooling water path 251 has a "U" shaped structure, so that heat dissipation performance to the negative electrode copper busbar 25 can be ensured.
Specifically, referring to fig. 6, a first water channel 251a and a second water channel 251b are penetratingly opened along a length direction of the negative copper busbar 25, a third water inlet joint 252 and a third water outlet joint 253 which are respectively communicated with the first water channel 251a and the second water channel 251b are installed at one end of the negative copper busbar 25, one ends of the first water channel 251a and the second water channel 251b, which are far away from the third water inlet joint 252 and the third water outlet joint 253, are communicated through a connecting water channel 251c, and a first plug 254 and a second plug 255 which are respectively used for blocking the first water channel 251a and the second water channel 251b are installed at the other end of the negative copper busbar 25, so that the first water channel 251a, the second water channel 251b and the connecting water channel 251c jointly form the negative copper busbar cooling water channel 251 in a 'U' -shaped structure. The first water channel 251a and the second water channel 251b of the water channel are processed in a through hole drilling mode, one end of the first water channel is plugged by the first plug 254 and the second water channel 255, so that the processing and forming of the negative electrode busbar cooling water channel 251 with a U-shaped structure are realized, the processing and forming are easy, and the cost is low.
Similarly, the connecting water channel 251c is processed by drilling blind holes, the first water channel 251a and the second water channel 251b of the water channel are communicated, and the outer end of the connecting water channel is plugged by the third plug 256, so that the processing difficulty is reduced.
Referring to fig. 1 and 2, the rectifying cabinet 2 includes two rectifying small cabinets 20 arranged side by side along a length direction thereof, the two rectifying small cabinets 20 are mutually communicated, each rectifying small cabinet 20 is provided with an anode three-phase rectifying bridge group 21 and a cathode three-phase rectifying bridge group 22 which are oppositely arranged along a width direction thereof, each thyristor water-cooled radiator 28 arranged on the anode three-phase rectifying bridge group 21 is uniformly distributed on one side of the anode three-phase rectifying bridge group 21 far away from the cathode three-phase rectifying bridge group 22, and each thyristor water-cooled radiator 28 arranged on the cathode three-phase rectifying bridge group 22 is uniformly distributed on one side of the cathode three-phase rectifying bridge group 22 far away from the anode three-phase rectifying bridge group 21. The structure makes the installation structures of the positive three-phase rectifier bridge group 21 and the negative three-phase rectifier bridge group 22 extremely symmetrical, thereby improving the balance of the installation of the internal structure of the rectifier cabinet 2, further improving the stability of the installation of the rectifier cabinet 2 and being more suitable for a more severe installation environment.
Referring to fig. 1 and 2, the connection copper bars 23 extend along the height direction of the rectifying cabinet 2, the upper ends of the connection copper bars extend out of the rectifying cabinet 2, all the connection copper bars 23 are divided into two groups in a bisecting manner, each group of connection copper bars 23 is installed between the corresponding positive three-phase rectifying bridge group 21 and negative three-phase rectifying bridge group 22, and each group of connection copper bars 23 are uniformly distributed along the length direction of the rectifying cabinet 20, so that the balance and stability of the overall structure of the rectifying cabinet 2 are further improved.
One side of the length direction of the rectifier cabinet 2 is provided with an electric control cabinet 4, the electric control cabinet 4 and the rectifier cabinet 2 are separated by a partition board 5, and the partition board 5 is fixedly arranged on the framework of the electric control cabinet 4 by mounting brackets 6 at four corners of the partition board 5. Only adopt a baffle 5 to separate automatically controlled cabinet 4 and rectifier cabinet 2, satisfied the design requirement of lightweight, simultaneously, through the fixed baffle 5 of four installing support 6, reliable and stable. In this embodiment, the mounting bracket 6 preferably adopts an L-shaped structure, so that the reliability of mounting the partition 5 can be improved.
Further, the electric control cabinet 4 and the rectifying cabinet 2 are further connected in a reinforced mode through the plurality of connecting pieces 1, and the reliability of connection between the electric control cabinet 4 and the rectifying cabinet 2 is guaranteed. And, the electric control cabinet 4 and the rectifying cabinet 2 jointly form a cuboid structure, so that the structure is compact.
Referring to fig. 1, in order to further improve the overall heat dissipation capability to the interior, this embodiment further increases an air-cooled heat dissipation structure, and a plurality of exhaust fans 7 are installed at the top of the rectifying cabinet 2, and a plurality of cabinet doors 1 are installed at both sides of the width direction of the rectifying cabinet 2, and only an air inlet grille 8 is installed at the lower part of each cabinet door 1, and according to the distance of the natural upward movement of hot air, this embodiment adopts an air-cooled heat dissipation mode with lower inlet and upper outlet, and the heat dissipation efficiency is higher, and the heat dissipation effect is more ideal.
Finally, it should be noted that the above description is only a preferred embodiment of the present utility model, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (8)

1. The utility model provides a heavy current three-phase alternating current rectifier cabinet group with high-efficient heat dissipation ability, includes rectifier cabinet (2) and sets up water cooling plant (3) in rectifier cabinet (2), water cooling plant (3) are including inlet tube (31) and outlet pipe (32), be provided with a plurality of water intaking water injection nozzles (311) on inlet tube (31), outlet pipe (32) are provided with water outlet nozzle (321) equal with water intaking water injection nozzles (311) quantity, be equipped with two anodal three-phase rectifier bridge group (21) in rectifier cabinet (2), two negative pole three-phase rectifier bridge group (22) and a plurality of connection copper bars (23), all install a plurality of silicon controlled water cooling radiator (28) on anodal three-phase rectifier bridge group (21) and the negative pole three-phase rectifier bridge group (22), each silicon controlled water cooling radiator's first water intake connector (281) and first water outlet connector (282) are respectively through water intaking water pipe and corresponding water intaking water injection nozzle (311) intercommunication, each connection copper bar (23) are respectively with anodal three-phase rectifier bridge (21) or positive three-phase rectifier bridge (24) respectively or positive three-phase rectifier bridge (24) are connected with anodal three-phase rectifier bridge (24) respectively, each negative three-phase rectifier bridge group (22) is electrically connected with an independent negative copper busbar (25) or is electrically connected to the same negative copper busbar (25), each positive copper busbar (24) is electrically connected with a corresponding positive wiring copper busbar (26), and each negative copper busbar (25) is electrically connected with a corresponding negative wiring copper busbar (27), and the three-phase rectifier bridge group is characterized in that: the inside of anodal copper busbar (24) is equipped with the female row cooling water route of at least one anodal (241), and the second water inlet joint (242) and the second water outlet joint (243) of each anodal female row cooling water route (241) are respectively through water pipe and corresponding water inlet tap (311) and water outlet tap (321) intercommunication, the inside of negative pole copper busbar (25) is equipped with the female row cooling water route of at least one negative pole (251), and the third water inlet joint (252) and the third water outlet joint (253) of each negative pole female row cooling water route (251) are respectively through water pipe and corresponding water inlet tap (311) and water outlet tap (321) intercommunication.
2. The high-current three-phase alternating current rectifier cabinet group with high-efficiency heat dissipation capability according to claim 1, wherein: the bottom of two anodal three-phase rectifier bridge group (21) is connected with same anodal copper busbar (24) electricity, and this anodal copper busbar (24) are along the length direction extension of rectifier cabinet (2), anodal copper busbar (24) have at least two anodal busbar cooling water routes (241) that run through along its length direction and set up, second water inlet connector (242) and second water outlet connector (243) that communicate with corresponding anodal busbar cooling water route (241) are installed respectively at the both ends of anodal copper busbar (24).
3. The high-current three-phase alternating current rectifier cabinet group with high-efficiency heat dissipation capability according to claim 1, wherein: the bottom of two negative pole three-phase rectifier bridge group (22) is connected with a negative pole copper busbar (25) respectively, and the length direction of two negative pole copper busbar (25) all commutates cabinet (2) extends, negative pole copper busbar (25) all are equipped with a negative pole busbar cooling water route (251) that are "U" shape structure, third water inlet connector (252) and water outlet connector (253) that are corresponding negative pole busbar cooling water route (251) intercommunication are installed to the one end of negative pole copper busbar (25).
4. A high-current three-phase alternating current rectifier cabinet group with high-efficiency heat dissipation capability according to claim 3, wherein: the negative electrode copper busbar (25) comprises a first waterway (251 a) and a second waterway (251 b) which penetrate through the negative electrode copper busbar along the length direction of the negative electrode copper busbar (25), wherein one end of the negative electrode copper busbar (25) is provided with a third water inlet joint (252) and a third water outlet joint (253) which are respectively communicated with the first waterway (251 a) and the second waterway (251 b), one end of the first waterway (251 a) and the second waterway (251 b) which are far away from the third water inlet joint (252) and one end of the third water outlet joint (253) are communicated through a connecting waterway (251 c), and the other end of the negative electrode copper busbar (25) is provided with a first plug (254) and a second plug (255) which are respectively used for plugging the first waterway (251 a) and the second waterway (251 b), so that the first waterway (251 a), the second waterway (251 b) and the connecting (251 c) jointly form a negative electrode row cooling waterway (251) with a U-shaped structure.
5. The high-current three-phase alternating current rectifier cabinet group with high-efficiency heat dissipation capability according to claim 1, wherein: the rectifier cabinet (2) comprises two rectifier small cabinets (20) which are arranged side by side along the length direction of the rectifier cabinet, the two rectifier small cabinets (20) are mutually communicated, each rectifier small cabinet (20) is internally provided with a positive three-phase rectifier bridge group (21) and a negative three-phase rectifier bridge group (22) which are oppositely arranged along the width direction of the rectifier small cabinets, each thyristor water-cooling radiator (28) arranged on the positive three-phase rectifier bridge group (21) is uniformly distributed on one side, far away from the negative three-phase rectifier bridge group (22), of the positive three-phase rectifier bridge group (21), and each thyristor water-cooling radiator (28) arranged on the negative three-phase rectifier bridge group (22) is uniformly distributed on one side, far away from the positive three-phase rectifier bridge group (21).
6. The high-current three-phase alternating current rectifier cabinet group with high-efficiency heat dissipation capability according to claim 5, wherein: the copper bars (23) are connected to extend along the height direction of the rectifier cabinet (2), the upper ends of the copper bars are penetrated out of the rectifier cabinet (2), all the copper bars (23) are divided into two groups in a bisecting mode, each group of copper bars (23) is installed between the corresponding positive three-phase rectifier bridge group (21) and negative three-phase rectifier bridge group (22), and all the copper bars (23) are uniformly distributed along the length direction of the small rectifier cabinet (20).
7. The high-current three-phase alternating current rectifier cabinet group with high-efficiency heat dissipation capability according to claim 1, wherein: one side of the length direction of the rectifier cabinet (2) is provided with an electric control cabinet (4), the electric control cabinet (4) and the rectifier cabinet (2) are separated by a partition board (5), and the partition board (5) is fixedly arranged on a framework of the electric control cabinet (4) through mounting brackets (6) at four corners of the partition board.
8. The high-current three-phase alternating current rectifier cabinet group with high-efficiency heat dissipation capability according to claim 1, wherein: a plurality of exhaust fans (7) are installed at the top of the rectifying cabinet (2), a plurality of cabinet doors (1) are installed on two sides of the width direction of the rectifying cabinet (2), and only an air inlet grille (8) is installed at the lower part of each cabinet door (1).
CN202323071732.3U 2023-11-14 2023-11-14 High-current three-phase alternating current rectifying cabinet group with efficient heat dissipation capability Active CN221043659U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202323071732.3U CN221043659U (en) 2023-11-14 2023-11-14 High-current three-phase alternating current rectifying cabinet group with efficient heat dissipation capability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202323071732.3U CN221043659U (en) 2023-11-14 2023-11-14 High-current three-phase alternating current rectifying cabinet group with efficient heat dissipation capability

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Publication Number Publication Date
CN221043659U true CN221043659U (en) 2024-05-28

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