CN116169581A - DC power distribution device for ship - Google Patents

Abstract

The invention discloses a ship direct-current power distribution device which comprises a closed water-cooling cabinet, a power cabinet and a control cabinet, wherein a liquid-liquid heat exchanger and an internal circulating pump are arranged in the water-cooling cabinet, a first partition plate is arranged between the water-cooling cabinet and the power cabinet, internal circulating air channels are arranged in the water-cooling cabinet, the power cabinet and the control cabinet, a first circulating fan and a gas-liquid heat exchanger are arranged on the first partition plate, the liquid-liquid heat exchanger is provided with a liquid cooling internal circulating pipeline and a liquid cooling external circulating pipeline extending out of the water-cooling cabinet, the liquid cooling internal circulating pipeline extends into the power cabinet and the control cabinet, and the internal circulating pump and the gas-liquid heat exchanger are connected with the liquid cooling internal circulating pipeline. The invention has the advantages of good heat dissipation performance, strong environmental adaptability, stable and reliable operation and the like.

Description

DC power distribution device for ship

Technical Field

The invention relates to a ship direct current networking electric propulsion system, in particular to a ship direct current distribution device.

Background

The ship system propelled by the diesel power has large vibration and high noise, and the tail gas emission does not accord with the increasingly improved environment-friendly concept and influences the feeling of riding people. Based on the above, the pure electric ship propulsion system has the advantages of low running noise, no pollution tail gas emission and environmental friendliness. The attention of the current mature direct current propulsion scheme is focused on the principle of an electric propulsion system, and the attention is less on the aspects of structural layout, heat dissipation form and the like of the system, so that the system is mostly suitable for ships with higher power, and the cabin space required to be arranged is larger. When the space of the ship cabin is limited and the heat dissipation condition is poor, the existing mature direct current propulsion scheme is not applicable any more.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the ship direct current power distribution device which has good heat dissipation performance, strong environmental adaptability and stable and reliable operation.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a boats and ships direct current distribution device, includes inclosed water-cooling cabinet, power cabinet and switch board, be equipped with liquid-liquid heat exchanger and internal circulation pump in the water-cooling cabinet, the water-cooling cabinet with be equipped with first baffle between the power cabinet, water-cooling cabinet power cabinet with be equipped with the internal circulation wind channel in the switch board, install first circulating fan and gas-liquid heat exchanger on the first baffle, liquid-liquid heat exchanger is equipped with liquid cooling internal circulation pipeline and extends to the outer liquid cooling external circulation pipeline of water-cooling cabinet, liquid cooling internal circulation pipeline extends to the power cabinet with in the switch board, the internal circulation pump with gas-liquid heat exchanger all with liquid cooling internal circulation pipeline connects.

As a further improvement of the above technical scheme: the internal circulation air duct comprises an air outlet channel and an air return channel which are arranged in the power cabinet, one end of the air outlet channel is in butt joint with an air outlet of the first circulation fan, the other end of the air outlet channel is communicated with the control cabinet, one end of the air return channel is communicated with the control cabinet, the other end of the air return channel is in butt joint with an air inlet of the air-liquid heat exchanger, a rectifying module and an inversion module are arranged in the air outlet channel, an internal cooling liquid outlet interface and an internal cooling liquid return interface are arranged on the liquid-liquid heat exchanger, and the liquid cooling internal circulation pipeline is arranged between the internal cooling liquid outlet interface and the internal cooling liquid return interface and is connected with the liquid cooling internal circulation pipeline.

As a further improvement of the above technical scheme: the liquid cooling internal circulation pipeline is close to one end of the internal cooling liquid outlet port and is provided with two branch pipes connected in parallel, the rectifying module and the inverting module are connected with one of the branch pipes, and the gas-liquid heat exchanger is connected with the other branch pipe.

As a further improvement of the above technical scheme: the inlet side of the internal circulation pump is connected with a pressure stabilizing tank, and the pressure stabilizing tank is pre-filled with pressure gas and provided with a bag body.

As a further improvement of the above technical scheme: and the inside of the bag body is filled with internal cooling liquid.

As a further improvement of the above technical scheme: the external cooling liquid adopted by the liquid-liquid heat exchanger is sea water, and the internal cooling liquid is glycol, pure water or a mixture of glycol and pure water.

As a further improvement of the above technical scheme: the air return channel is internally provided with a second partition board, and a second circulating fan is arranged on the second partition board.

As a further improvement of the above technical scheme: and a third partition plate is arranged between the air outlet channel and the return air channel.

As a further improvement of the above technical scheme: the air-out passageway is located return air passageway top, the air-out passageway top is equipped with middle direct current busbar and quick-operation fuse, rectifier module and contravariant module are located the air-out passageway middle part, rectifier module and contravariant module's downside with have the clearance between the third baffle, rectifier module and contravariant module's upside with have the clearance between middle direct current busbar and the quick-operation fuse.

As a further improvement of the above technical scheme: the air return channel is internally provided with an alternating current circuit breaker, a direct current circuit breaker, a capacitor and a reactor, wherein the alternating current circuit breaker and the direct current circuit breaker are arranged on one side, close to the gas-liquid heat exchanger, of the second partition board, the capacitor and the reactor are arranged on one side, far away from the gas-liquid heat exchanger, of the second partition board, the rectifying module is arranged above the alternating current circuit breaker and the direct current circuit breaker, and the inverting module is arranged above the capacitor and the reactor.

As a further improvement of the above technical scheme: the refrigerator is characterized in that more than one group of external cooling interfaces are arranged on the refrigerator, and each external cooling interface comprises an external liquid outlet interface connected with the internal cooling liquid outlet interface and an external liquid return interface connected with the internal cooling liquid return interface.

As a further improvement of the above technical scheme: the outer periphery of the outer liquid outlet interface and the outer liquid return interface is provided with a clamp, and the inner periphery of the outer liquid outlet interface is provided with threads.

Compared with the prior art, the invention has the advantages that: according to the ship direct-current distribution device disclosed by the invention, a closed heat dissipation mode is adopted, the rectifying module and the inversion module of the main heating device in the power cabinet directly conduct liquid cooling heat dissipation, and the rest parts of devices with less heat in the cabinet conduct auxiliary heat dissipation through the first circulating fan and the gas-liquid heat exchanger in the cabinet, so that all heat is ensured to be taken away through external cooling liquid. The closed heat dissipation form makes cabinet body structure can reach higher protection level for device environmental suitability is stronger, and the water-cooling part of device independently becomes the cabinet, both can independently use, makes things convenient for the piece together cabinet of unit cabinet again to connect, also adapts to the demand of the boats and ships cabin overall arrangement in less space.

Drawings

Fig. 1 is a schematic diagram of a front view of a dc power distribution device for a ship according to the present invention.

Fig. 2 is a schematic perspective view of a first view angle inside the dc power distribution device for a ship according to the present invention.

Fig. 3 is a schematic perspective view of a second view angle inside the dc power distribution device for a ship according to the present invention.

Fig. 4 is a schematic view of the structure of the cooling air flow path inside the ship direct current distribution device of the present invention.

Fig. 5 is a schematic diagram of the cooling system of the present invention.

Fig. 6 is a schematic diagram of the front view of the interior of the power cabinet of the present invention.

FIG. 7 is a schematic diagram of the side of the water-cooled cabinet of the present invention.

Fig. 8 is a schematic cross-sectional view of an external cooling interface in the present invention.

Fig. 9 is a schematic diagram of the circuitry of the present invention.

The reference numerals in the drawings denote: 1. a water-cooled cabinet; 11. a first separator; 12. a first circulating fan; 2. a power cabinet; 20. an alternating current circuit breaker; 21. an air outlet channel; 22. a return air channel; 221. a second separator; 23. a second circulating fan; 24. a third separator; 25. a middle direct current busbar; 26. a fast fuse; 27. a direct current breaker; 28. a capacitor; 29. a reactor; 3. a rectifying module; 4. an inversion module; 5. a liquid-liquid heat exchanger; 51. an external cooling liquid inlet port; 52. an external cooling liquid outlet port; 53. an internal cooling liquid outlet port; 54. an internal cooling liquid return port; 55. a liquid-cooled internal circulation pipe; 56. an external circulation pump; 57. a filter; 6. an internal circulation pump; 61. a surge tank; 7. a gas-liquid heat exchanger; 8. an external cooling interface; 81. an external liquid outlet interface; 82. an external liquid return interface; 83. a clamp; 9. a control cabinet; 91. a contactor; 92. a relay; 93. and an outgoing line terminal.

Detailed Description

The invention is described in further detail below with reference to the drawings and specific examples of the specification.

Fig. 1 to 9 show an embodiment of a ship direct current power distribution device according to the present invention, which includes a closed water cooling cabinet 1, a power cabinet 2 and a control cabinet 9, wherein a liquid-liquid heat exchanger 5 and an internal circulation pump 6 are disposed in the water cooling cabinet 1, a first partition board 11 is disposed between the water cooling cabinet 1 and the power cabinet 2, an air outlet channel 21 and a return air channel 22 are disposed in the power cabinet 2, a rectifying module 3 and an inversion module 4 are disposed in the air outlet channel 21, a first circulation fan 12 is disposed at a position corresponding to the air outlet channel 21 of the first partition board 11, a gas-liquid heat exchanger 7 is disposed at a position corresponding to the return air channel 22 of the first partition board 11, the air outlet channel 21 and the return air channel 22 are both communicated with the control cabinet 9, an external cooling liquid inlet interface 51, an external cooling liquid outlet interface 52, an internal cooling liquid outlet interface 53 and an internal cooling liquid return interface 54 are disposed on the liquid-liquid heat exchanger 5, an internal circulation pipeline 55 is disposed between the internal cooling liquid outlet interface 53 and the internal cooling liquid return interface 54, and the internal circulation pump 6, the rectifying module 3, the inversion module 4 and the gas-liquid heat exchanger 7 are disposed on the internal circulation pipeline 55.

According to the ship direct-current distribution device, a closed heat dissipation mode is adopted, liquid cooling heat dissipation is directly carried out on main heating devices (a rectifying module 3, an inversion module 4 and the like) in the power cabinet 2, and other parts (such as a middle direct-current busbar 25, a quick fuse 26, a capacitor 28, a reactor 29 and the like) with less heat in the cabinet are subjected to auxiliary heat dissipation through the first circulating fan 12 and the gas-liquid heat exchanger 7 in the cabinet, so that local heat concentration in the cabinet is avoided, and all heat is ensured to be taken away through external cooling liquid. The closed heat dissipation form makes cabinet body structure can reach higher protection level for device environmental suitability is stronger, and the water-cooling part of device independently becomes the cabinet, both can independently use, makes things convenient for the splice cabinet of unit cabinet to connect again, also adapts to the boats and ships cabin overall arrangement demand in less space. The first circulating fan 12 for heat dissipation of the power cabinet 2 and the gas-liquid heat exchanger 7 are arranged on the first partition plate 11 and serve as a part of an internal circulating air duct for cooling, so that the heat dissipation is met, and meanwhile, additional air duct structural members are not required to be added, and the cabinet body structures of the power cabinet 2 and the water cooling cabinet 1 are more compact.

Further, in this embodiment, two parallel branch pipes are disposed at one end of the liquid cooling inner circulation pipeline 55 near the inner coolant outlet port 53, the rectifying module 3 and the inverting module 4 are disposed on one of the branch pipes, and the gas-liquid heat exchanger 7 is disposed on the other branch pipe. The rectifying module 3 and the inverting module 4 are main heating devices, have higher temperature rise and are arranged on one branch pipe; the gas-liquid heat exchanger 7 needs to absorb the heat of other parts in the cabinet, has higher temperature rise and is arranged on the other branch pipe, thus being beneficial to ensuring that the overall heat dissipation performance in the cabinet meets the requirement. Of course, in other embodiments, the rectification module 3, the inversion module 4 and the gas-liquid heat exchanger 7 may be respectively disposed on different branch pipes, and the low-temperature internal cooling liquid output by the internal cooling liquid outlet 53 directly dissipates heat of the rectification module 3, the inversion module 4 and the gas-liquid heat exchanger 7, which is more beneficial to cool down and cool down the inversion module 4. At the same time, however, the pipeline structure of the cooling system is more complicated and the cost is increased.

Further, in the present embodiment, the inlet side of the internal circulation pump 6 is connected with a surge tank 61, and the surge tank 61 is pre-filled with a pressurized gas and provided with a bladder (not shown in the figure, and specific structure may refer to a commonly used bladder), and preferably, the bladder is filled with an internal cooling liquid. A certain pressure gas is pre-filled between the bag body and the tank body of the pressure stabilizing tank 61, when the pressure in the liquid cooling internal circulation pipeline 55 is increased, the liquid in the pipe extrudes the internal cooling liquid in the bag body, and the pressure in the pipeline is released; when the pressure in the liquid cooling internal circulation pipeline 55 is reduced, the gas pressure in the pressure stabilizing tank 61 is released, and the cooling liquid in the bag body is extruded into the liquid cooling internal circulation pipeline 55, so that the dual functions of pressure stabilizing and water supplementing are realized.

As a preferred embodiment, the liquid-liquid heat exchanger 5 uses sea water as the external cooling liquid and ethylene glycol as the internal cooling liquid. The liquid-liquid heat exchanger 5 can adopt a plate heat exchanger and the like, the internal and external circulating cooling liquid exchanges heat at the plate heat exchanger, and the internal circulating cooling liquid adopts glycol cooling liquid, so that special protective measures are not required to be additionally considered for devices involved in the internal circulation, the external circulation pipeline is directly connected with seawater, or the external circulation directly uses seawater, a secondary water cooling system (a water cooling system for converting heat of the seawater and fresh water) is not required to be designed on a ship, the heat dissipation performance is good, the structure of the cooling system can be simplified, and the manufacturing and running cost of the device can be reduced. Of course, in other embodiments, the internal cooling fluid may be pure water, or a mixture of ethylene glycol and pure water.

Further, in this embodiment, the second partition 221 is disposed in the return air channel 22, and the second circulation fan 23 is disposed on the second partition 221, so that air in the return air channel 22 flows back according to a set path, and heat dissipation performance of devices in the return air channel 22 is ensured.

Further, in the present embodiment, a third partition 24 is disposed between the air outlet channel 21 and the air return channel 22. The third partition board 24 separates the heating component at the bottom of the power cabinet 2 from the rectifying module 3 and the inverting module 4 at the upper part, and separates the power cabinet 2 into a left cavity and a right cavity as a part of the return air channel 22, so that the cabinet body structure of the power cabinet 2 is more compact while meeting the heat dissipation requirement.

As a preferred embodiment, the air outlet channel 21 is located above the return air channel 22, correspondingly, the first circulating fan 12 is arranged on the upper side of the first partition 11, the air-liquid heat exchanger 7 is arranged on the lower side of the first partition 11, the middle direct current busbar 25 and the fast fuse 26 are arranged at the top of the air outlet channel 21, the rectifying module 3 and the inverting module 4 are located in the middle of the air outlet channel 21, a gap is formed between the lower sides of the rectifying module 3 and the inverting module 4 and the third partition 24, a gap is formed between the upper sides of the rectifying module 3 and the inverting module 4 and the middle direct current busbar 25 and the fast fuse 26, the ac circuit breaker 20, the direct current circuit breaker 27, the capacitor 28 and the reactor 29 are arranged in the return air channel 22, the ac circuit breaker 20 and the direct current circuit breaker 27 are arranged on one side of the second partition 221 close to the air-liquid heat exchanger 7, the capacitor 28 and the reactor 29 are arranged on one side of the second partition 221 far away from the air-liquid heat exchanger 7, the rectifying module 3 is located above the ac circuit breaker 20 and the direct current circuit breaker 27, and the inverting module 4 is located above the capacitor 28 and the reactor 29. The power cabinet 2 is internally divided into three layers from top to bottom and the bottom layer is divided into left and right cavities, the middle direct current busbar 25 and the quick fuse 26 are placed on the top layer, the rectifying module 3 and the inverting module 4 are placed on the middle layer and used for wiring, the bottom layer is used for placing the wire inlet and outlet devices such as the alternating current circuit breaker 20, the direct current circuit breaker 27, the capacitor 28 and the reactor 29, the internal structure of the power cabinet 2 is clear, the maximization of space utilization is realized, and the space is reserved between the layers, so that wiring and pipe arrangement in the cabinet are more regular, and maintainability of the devices is improved.

Further, in this embodiment, the water refrigerator 1 is provided with three sets of external cooling interfaces 8, and the external cooling interfaces 8 include an external liquid outlet interface 81 connected to the internal cooling liquid outlet interface 53, and an external liquid outlet interface 82 connected to the internal cooling liquid return interface 54. The three groups of external cooling interfaces 8 can meet the heat dissipation requirements of other liquid cooling heat dissipation equipment in the ship cabin.

Further, in the present embodiment, the outer periphery of the outer liquid outlet port 81 and the outer liquid return port 82 is provided with a collar 83 and the inner periphery is provided with threads. The external liquid outlet port 81 and the external liquid return port 82 are externally connected by adopting a clamp 83 and a pipeline, and the internal part adopts a threaded structure, so that the diversified requirements of the external port can be met. The external liquid outlet interface 81 and the external liquid return interface 82 are provided with uniform plugs, and the plugs are unscrewed when the device is used, so that the operation is convenient.

Referring to fig. 4 and 5, the cooling system of the ship direct current power distribution device of the present invention operates as follows:

the inner cooling liquid outlet port 53 of the liquid-liquid heat exchanger 5 outputs low-temperature inner cooling liquid to the rectifying module 3, the inverting module 4 and the gas-liquid heat exchanger 7, heat generated by the rectifying module 3, the inverting module 4 and the gas-liquid heat exchanger 7 is absorbed, then flows back to the liquid-liquid heat exchanger 5 through the liquid cooling inner circulation pipeline 55 and the inner cooling liquid return port 54, the clean seawater filtered by the filter 57 is input into the liquid-liquid heat exchanger 5 through the outer cooling liquid inlet port 51 by the outer circulation pump 56, the heat exchange between the inner cooling liquid and the seawater is carried out in the liquid-liquid heat exchanger 5, the heat absorbed by the inner cooling liquid is transferred to the seawater to realize cooling, the seawater after heat absorption and temperature rise flows back through the outer cooling liquid outlet port 52, and the heat is transferred into the sea, so that the heat is circulated. Under the action of the first circulating fan 12 and the second circulating fan 23, air in the device flows clockwise along the air outlet channel 21 and the air return channel 22, heat generated by devices in the air outlet channel 21, heat generated by devices in the control cabinet 9 (mainly comprising a contactor 91, a relay 92, an outlet terminal 93 and the like) and heat generated by devices in the air return channel 22 are sequentially absorbed, and when the gas subjected to heat absorption and temperature rise passes through the gas-liquid heat exchanger 7, the gas subjected to heat exchange with low-temperature internal cooling liquid output by the internal cooling liquid outlet interface 53 enters the air outlet channel 21 again through the first circulating fan 12, and the gas is circulated in this way.

Referring to fig. 9, the principle of the circuit system of the ship direct current power distribution device of the present invention is as follows:

the positive and negative poles of the battery system are respectively connected with the positive and negative poles of the direct current breaker 27, and then connected to the intermediate direct current loop, and a current sensor is arranged to detect direct current before being connected to the intermediate direct current loop. The three-phase cables of the permanent magnet synchronous generator are respectively connected with the three phases of the alternating current circuit breaker 20, then connected with the rectifying module 3 and finally connected to the middle direct current loop, a fast fuse 26 is arranged between the rectifying module 3 and the middle direct current loop, a current sensor is arranged on the positive electrode to detect direct current, and the fast fuse 26 is used for protection. A direct current charging interface is reserved in a left side chamber at the bottom layer of the power cabinet 2, and an inverter module 4, an output side LC circuit (comprising a capacitor 28 and a reactor 29), a middle direct current LC circuit (comprising the capacitor 28 and the reactor 29), a pre-charging circuit, a middle direct current output interface and a shore power interface are arranged in a right side chamber. The middle direct current loop is led out to be connected with an inversion module 4 in a positive-negative way, the inversion module 4 is connected with an alternating current contactor in two stages, a capacitor 28 is connected between the two stages, a reactor 29 is connected in series on one stage of the inversion module, the output of the alternating current contactor is connected with a circuit breaker again, the output of the alternating current contactor is finally connected to shore power, and the reactor 29 is connected in series on one stage between the alternating current contactor and the circuit breaker.

While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.

Claims (12)

1. The utility model provides a boats and ships direct current distribution device, includes inclosed water-cooling cabinet (1), power cabinet (2) and switch board (9), its characterized in that: be equipped with liquid-liquid heat exchanger (5) and inner circulating pump (6) in water-cooling cabinet (1), water-cooling cabinet (1) with be equipped with first baffle (11) between power cabinet (2), water-cooling cabinet (1), power cabinet (2) with be equipped with the inner circulating wind channel in switch board (9), install first circulating fan (12) and gas-liquid heat exchanger (7) on first baffle (11), liquid-liquid heat exchanger (5) are equipped with liquid cooling inner circulating pipeline (55) and extend to the outer liquid cooling outer circulating pipeline of water-cooling cabinet (1), liquid cooling inner circulating pipeline (55) extend to power cabinet (2) with in switch board (9), inner circulating pump (6) with gas-liquid heat exchanger (7) all with liquid cooling inner circulating pipeline (55) are connected.

2. The marine direct current power distribution device of claim 1, wherein: the utility model discloses a power cabinet, including power cabinet (2) in the air-out passageway (21) and return air passageway (22), air-out passageway (21) one end with the air outlet butt joint of first circulating fan (12), the other end with switch board (9) intercommunication, return air passageway (22) one end with switch board (9) intercommunication, the other end with the air inlet butt joint of gas-liquid heat exchanger (7), be equipped with rectifier module (3) and contravariant module (4) in air-out passageway (21), be equipped with interior coolant liquid outlet (53) and interior coolant liquid return interface (54) on liquid-liquid heat exchanger (5), liquid cooling inner loop pipe (55) are located interior coolant liquid outlet (53) with between interior coolant liquid return interface (54), rectifier module (3) and contravariant module (4) all with liquid cooling inner loop pipe (55) are connected.

3. The marine direct current power distribution device of claim 2, wherein: two parallel branch pipes are arranged at one end of the liquid cooling inner circulation pipeline (55) close to the inner cooling liquid outlet interface (53), the rectifying module (3) and the inverting module (4) are connected with one branch pipe, and the gas-liquid heat exchanger (7) is connected with the other branch pipe.

4. The marine direct current power distribution device of claim 2, wherein: the inlet side of the internal circulation pump (6) is connected with a surge tank (61), and the surge tank (61) is pre-filled with pressure gas and provided with a bag body.

5. The marine direct current power distribution device of claim 4, wherein: and the inside of the bag body is filled with internal cooling liquid.

6. Marine direct current power distribution device according to any of claims 1 to 5, characterized in that: the external cooling liquid adopted by the liquid-liquid heat exchanger (5) is sea water, and the internal cooling liquid is glycol, pure water or a mixture of glycol and pure water.

7. Marine direct current power distribution device according to any of claims 2 to 5, characterized in that: a second partition plate (221) is arranged in the return air channel (22), and a second circulating fan (23) is arranged on the second partition plate (221).

8. The marine direct current power distribution device of claim 7, wherein: a third partition plate (24) is arranged between the air outlet channel (21) and the return air channel (22).

9. The marine direct current power distribution device of claim 8, wherein: the air-out passageway (21) is located return air passageway (22) top, air-out passageway (21) top is equipped with middle direct current busbar (25) and quick-operation fuse (26), rectifier module (3) and contravariant module (4) are located air-out passageway (21) middle part, rectifier module (3) and contravariant module (4) downside with have the clearance between third baffle (24), rectifier module (3) and contravariant module (4) upside with have the clearance between middle direct current busbar (25) and quick-operation fuse (26).

10. The marine direct current power distribution device of claim 9, wherein: be equipped with in return air passageway (22) exchange circuit breaker (20), direct current circuit breaker (27), condenser (28) and reactor (29), exchange circuit breaker (20) and direct current circuit breaker (27) are located second baffle (221) are close to one side of gas-liquid heat exchanger (7), condenser (28) and reactor (29) are located second baffle (221) are kept away from one side of gas-liquid heat exchanger (7), rectifier module (3) are located exchange circuit breaker (20) and direct current circuit breaker (27) top, inverter module (4) are located condenser (28) and reactor (29) top.

11. Marine direct current power distribution device according to any of claims 2 to 5, characterized in that: the water cooling cabinet (1) is provided with more than one group of external cooling interfaces (8), and the external cooling interfaces (8) comprise an external liquid outlet interface (81) connected with the internal cooling liquid outlet interface (53) and an external liquid return interface (82) connected with the internal cooling liquid return interface (54).

12. The marine direct current power distribution device of claim 11, wherein: the outer periphery of the outer liquid outlet interface (81) and the outer liquid return interface (82) is provided with a clamp (83) and the inner periphery is provided with threads.

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