CN216672336U - Ship direct-current power distribution device - Google Patents

Abstract

The utility model 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 inner circulating pump are arranged in the water-cooling cabinet, a first partition plate is arranged between the water-cooling cabinet and the power cabinet, inner circulating air ducts 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 mounted on the first partition plate, the liquid-liquid heat exchanger is provided with a liquid-cooling inner circulating pipeline and a liquid-cooling outer circulating pipeline extending to the outside of the water-cooling cabinet, the liquid-cooling inner circulating pipeline extends into the power cabinet and the control cabinet, and the inner circulating pump and the gas-liquid heat exchanger are connected with the liquid-cooling inner circulating pipeline. The utility model has the advantages of good heat dispersion, strong environmental adaptability, stable and reliable operation and the like.

Description

Ship direct-current power distribution device

Technical Field

The utility model relates to a ship direct-current networking electric propulsion system, in particular to a ship direct-current power distribution device.

Background

The diesel power propelled ship system has large vibration and high noise, and the exhaust emission does not accord with the increasingly improved environmental protection idea and influences the feeling of riding people. Based on this, pure ship propulsion system takes place at the same time, and its advantage lies in that the running noise is low, and pollution exhaust emission is not had, and is relatively friendly to the environment. The current mature direct current propulsion scheme focuses on the principle of an electric propulsion system, has less attention on the aspects of structural layout, heat dissipation form and the like of the system, is mostly suitable for ships with higher power, and requires larger cabin space for arrangement. 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.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide the ship direct-current power distribution device which is good in heat dissipation performance, strong in environmental adaptability and stable and reliable in operation.

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

a ship direct-current power distribution device comprises an airtight water-cooled cabinet, a power cabinet and a control cabinet, wherein a liquid-liquid heat exchanger and an internal circulation pump are arranged in the water-cooled cabinet, a first partition plate is arranged between the water-cooled cabinet and the power cabinet, an internal circulation air duct is arranged in the water-cooled cabinet, the power cabinet and the control cabinet, a first circulating fan and the gas-liquid heat exchanger are installed on the first partition plate, the liquid-liquid heat exchanger is provided with a liquid-cooled internal circulation pipeline and a liquid-cooled external circulation pipeline extending to the outside of the water-cooled cabinet, the liquid-cooled internal circulation pipeline extends to the power cabinet and the control cabinet, and the internal circulation pump and the gas-liquid heat exchanger are connected with the liquid-cooled internal circulation pipeline.

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

As a further improvement of the above technical solution: the liquid cooling internal circulation pipeline is provided with two parallel branch pipes at one end close to the internal cooling liquid outlet interface, the rectification module and the inversion 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 solution: the inlet side of the internal circulating 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 solution: the bag body is filled with internal cooling liquid.

As a further improvement of the technical scheme: the liquid-liquid heat exchanger adopts seawater as external cooling liquid, and ethylene glycol, pure water or a mixture of ethylene glycol and pure water as internal cooling liquid.

As a further improvement of the above technical solution: and a second partition board is arranged in the return air channel, and a second circulating fan is arranged on the second partition board.

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

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

As a further improvement of the above technical solution: be equipped with alternating current circuit breaker, direct current circuit breaker, condenser and reactor in the return air passageway, alternating current circuit breaker and direct current circuit breaker locate the second baffle is close to one side of gas-liquid heat exchanger, condenser and reactor are located the second baffle is kept away from one side of gas-liquid heat exchanger, rectifier module is located alternating current circuit breaker and direct current circuit breaker's top, contravariant module is located the top of condenser and reactor.

As a further improvement of the above technical solution: the water-cooled cabinet is provided with more than one group of external cooling interfaces, 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 solution: the external liquid outlet interface and the external liquid return interface are provided with hoops at the periphery and threads at the inner periphery.

Compared with the prior art, the utility model has the advantages that: the ship direct-current power distribution device disclosed by the utility model adopts a closed heat dissipation mode, a rectifier module and an inverter module of main heating devices in a power cabinet directly carry out liquid cooling heat dissipation, and other parts generating less heat in the cabinet carry out auxiliary heat dissipation through a first circulating fan and an air-liquid heat exchanger in the cabinet, so that all heat is taken away through external cooling liquid. The closed heat dissipation form makes the 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 independent utility, makes things convenient for the cabinet of piecing together of unit cabinet to connect again, also adapts to the demand of the boats and ships cabin overall arrangement in less space.

Drawings

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

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

Fig. 3 is a schematic perspective view of a second perspective view of the internal structure of the dc distribution apparatus for ships according to the present invention.

Fig. 4 is a schematic structural view of a cooling air flow path inside the dc distribution apparatus for a ship according to the present invention.

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

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

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

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

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

The reference numerals in the figures 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. an air return channel; 221. a second separator; 23. a second circulating fan; 24. a third partition plate; 25. an intermediate direct-current bus bar; 26. a fast fuse; 27. a direct current breaker; 28. a capacitor; 29. a reactor; 3. a rectification module; 4. an inversion module; 5. a liquid-liquid heat exchanger; 51. an external cooling liquid inlet interface; 52. an external cooling liquid outlet port; 53. an internal cooling liquid outlet interface; 54. an internal cooling liquid return interface; 55. a liquid-cooled internal circulation pipeline; 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. clamping a hoop; 9. a control cabinet; 91. a contactor; 92. a relay; 93. and an outlet terminal.

Detailed Description

The utility model is described in further detail below with reference to the figures and specific examples of the specification.

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

This boats and ships direct current distribution device adopts the radiating mode of closed, and the main device that generates heat (rectifier module 3, contravariant module 4 etc.) in the power cabinet 2 directly carries out the liquid cooling heat dissipation, and the supplementary heat dissipation of first circulating fan 12 and gas-liquid heat exchanger 7 through the cabinet of the less part of all the other devices that generate heat (for example middle direct current female arranging 25, fast acting fuse 26, condenser 28 and reactor 29 etc.) in the cabinet avoids local heat to concentrate in the cabinet, ensures that all heats are all taken away through outside coolant liquid. The closed heat dissipation form makes the 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 independent utility, makes things convenient for the cabinet of piecing together of unit cabinet to connect again, also adapts to the boats and ships cabin overall arrangement demand in less space. A 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 are used as a part of an internal circulating air duct for cooling, so that the heat dissipation is met, an additional air duct structural member is 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-cooled internal circulation pipeline 55 near the internal cooling liquid outlet port 53, the rectification module 3 and the inversion 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 rectification module 3 and the inversion module 4 are main heating devices, have high 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, so that the requirement of the integral heat dispersion performance in the cabinet can be met. Certainly, 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 favorable for cooling the inversion module 4. But at the same time, the piping structure of the cooling system is also complicated and the cost is increased.

Further, in the present embodiment, the inlet side of the internal circulation pump 6 is connected to a pressure-stabilizing tank 61, the pressure-stabilizing tank 61 is pre-filled with pressure gas and provided with a bag body (not shown in the figure, and the specific structure can refer to a common air bag), and preferably, the bag body is filled with an internal cooling liquid. Gas with certain pressure 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 pipeline 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 stabilization and water supplement are realized.

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

Further, in this embodiment, a second partition 221 is disposed in the return air channel 22, and a second circulating 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.

Furthermore, 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 plate 24 separates the heat generating components at the bottom of the power cabinet 2 from the rectifier module 3 and the inverter 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 the heat dissipation requirement is met.

As a preferred embodiment, the air outlet channel 21 is located above the air return channel 22, and correspondingly, the first circulating fan 12 is disposed on the upper side of the first partition plate 11, the gas-liquid heat exchanger 7 is disposed on the lower side of the first partition plate 11, the top of the air outlet channel 21 is provided with the intermediate dc bus bar 25 and the fast fuse 26, the rectifier module 3 and the inverter module 4 are located in the middle of the air outlet channel 21, a gap is formed between the lower sides of the rectifier module 3 and the inverter module 4 and the third partition plate 24, a gap is formed between the upper sides of the rectifier module 3 and the inverter module 4 and the intermediate dc bus bar 25 and the fast fuse 26, the air return channel 22 is provided with the ac circuit breaker 20, the dc circuit breaker 27, the capacitor 28 and the reactor 29, the ac circuit breaker 20 and the dc circuit breaker 27 are disposed on the side of the second partition plate 221 close to the gas-liquid heat exchanger 7, the capacitor 28 and the reactor 29 are disposed on the side of the second partition plate 221 far from the gas-liquid heat exchanger 7, the rectifier module 3 is located above the ac circuit breaker 20 and the dc circuit breaker 27, and the inverter module 4 is located above the capacitor 28 and the reactor 29. Divide into two chambeies on the left and right of three-layer and bottom branch from last in power cabinet 2 down, the middle direct current is placed on the top layer and is arranged 25 and quick-acting fuse 26, rectifier module 3 is placed to the intermediate level, contravariant module 4 is used for walking the line, the bottom then is used for placing ac circuit breaker 20, dc circuit breaker 27, business turn over line devices such as condenser 28 and reactor 29, make power cabinet 2 interior structure level clear and definite, realize the maximize of space utilization, reserve space between layer and layer, make the interior wiring of cabinet, the stringing is more regular, be favorable to improving the maintainability of device.

Further, in this embodiment, three sets of external cooling interfaces 8 are disposed on the water-cooled cabinet 1, and each external cooling interface 8 includes an external liquid outlet interface 81 connected to the internal cooling liquid outlet interface 53 and an external liquid return interface 82 connected to the internal cooling liquid return interface 54. The three external cooling interfaces 8 can meet the heat dissipation requirements of other liquid cooling heat dissipation equipment in the cabin of the ship.

Furthermore, in the present embodiment, the external liquid outlet port 81 and the external liquid return port 82 are provided with clips 83 on the outer circumference and threads on the inner circumference. The connection form of the hoop 83 and the pipeline is adopted outside the external liquid outlet port 81 and the external liquid return port 82, and the threaded structure is adopted inside the external liquid outlet port 81 and the external liquid return port 82, so that the diversified requirements of the external ports can be met. The external liquid outlet port 81 and the external liquid return port 82 are provided with unified 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 dc distribution apparatus for ships according to the present invention operates as follows:

the internal cooling liquid outlet interface 53 of the liquid-liquid heat exchanger 5 outputs low-temperature internal cooling liquid to the rectification module 3, the inversion module 4 and the gas-liquid heat exchanger 7, the low-temperature internal cooling liquid flows back to the liquid-liquid heat exchanger 5 through the liquid-cooling internal circulation pipeline 55 and the internal cooling liquid return interface 54 after absorbing heat generated by the rectification module 3, the inversion module 4 and the gas-liquid heat exchanger 7, the clean seawater filtered by the filter 57 is input into the liquid-liquid heat exchanger 5 through the external cooling liquid inlet interface 51 by the external circulation pump 56, the internal cooling liquid and the seawater exchange heat in the liquid-liquid heat exchanger 5, the heat absorbed by the internal cooling liquid is transferred to the seawater to realize cooling, the seawater heated by absorbing heat flows back through the external cooling liquid outlet interface 52, and the heat is transferred to the sea, and the circulation is carried out. Air inside the device flows clockwise along the air outlet channel 21 and the air return channel 22 under the action of the first circulating fan 12 and the second circulating fan 23, 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 absorbed successively, heat exchange is carried out between the gas after heat absorption and temperature rise and low-temperature internal cooling liquid output by the internal cooling liquid outlet interface 53 when the gas passes through the gas-liquid heat exchanger 7, the gas after temperature reduction enters the air outlet channel 21 again through the first circulating fan 12, and the circulation is carried out.

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

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

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the utility model, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme 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 internal circulation pump (6) in water-cooled cabinet (1), water-cooled cabinet (1) with be equipped with first baffle (11) between power cabinet (2), water-cooled cabinet (1), power cabinet (2) and be equipped with the inner loop 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 loop pipeline (55) and extend to the outer liquid cooling outer loop pipeline of water-cooled cabinet (1), liquid cooling inner loop pipeline (55) extend to in power cabinet (2) and switch board (9), internal circulation pump (6) with gas-liquid heat exchanger (7) all with liquid cooling inner loop pipeline (55) are connected.

2. The marine dc power distribution apparatus of claim 1, wherein: the internal circulation air duct comprises an air outlet channel (21) and an air return channel (22) which are arranged in the power cabinet (2), one end of the air outlet channel (21) is butted with an air outlet of the first circulating fan (12), the other end is communicated with the control cabinet (9), one end of the return air channel (22) is communicated with the control cabinet (9), the other end is butted with an air inlet of the gas-liquid heat exchanger (7), a rectification module (3) and an inversion module (4) are arranged in the air outlet channel (21), an inner cooling liquid outlet interface (53) and an inner cooling liquid return interface (54) are arranged on the liquid-liquid heat exchanger (5), the liquid cooling internal circulation pipeline (55) is arranged between the internal cooling liquid outlet interface (53) and the internal cooling liquid return interface (54), and the rectifying module (3) and the inversion module (4) are connected with the liquid cooling internal circulation pipeline (55).

3. The marine dc power distribution apparatus of claim 2, wherein: one end, close to the inner cooling liquid outlet port (53), of the liquid cooling inner circulation pipeline (55) is provided with two branch pipes which are connected in parallel, the rectifying module (3) and the inverting module (4) are connected with one of the branch pipes, and the gas-liquid heat exchanger (7) is connected with the other branch pipe.

4. The marine dc distribution apparatus of claim 2, wherein: the inlet side of the internal circulation pump (6) is connected with a pressure stabilizing tank (61), and the pressure stabilizing tank (61) is pre-filled with pressure gas and provided with a sac body.

5. The marine dc power distribution apparatus of claim 4, wherein: the bag body is filled with internal cooling liquid.

6. The marine dc power distribution apparatus of any one of claims 1 to 5, wherein: the liquid-liquid heat exchanger (5) adopts seawater as external cooling liquid, and ethylene glycol, pure water or a mixture of ethylene glycol and pure water as internal cooling liquid.

7. The marine dc distribution unit of any one of claims 2 to 5, wherein: a second partition board (221) is arranged in the air return channel (22), and a second circulating fan (23) is arranged on the second partition board (221).

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

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

10. The marine dc power distribution apparatus of claim 9, wherein: be equipped with alternating current circuit breaker (20), direct current circuit breaker (27), condenser (28) and reactor (29) in return air passageway (22), alternating current 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 the top of alternating current circuit breaker (20) and direct current circuit breaker (27), inverter module (4) are located the top of condenser (28) and reactor (29).

11. The marine dc distribution unit of any one of claims 2 to 5, wherein: the water cooling cabinet (1) is provided with more than one group of external cooling interfaces (8), and each external cooling interface (8) comprises 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 dc power distribution apparatus of claim 11, wherein: the outer periphery of the external liquid outlet interface (81) and the outer periphery of the external liquid return interface (82) are provided with clamps (83), and the inner periphery of the external liquid return interface is provided with threads.

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