Low-voltage cabinet liquid cooling system

Abstract

The application discloses a low-voltage cabinet liquid cooling system and belongs to the technical field of electrical equipment heat dissipation. The system comprises a circuit breaker cabinet, a pre-charging cabinet, an inductor-capacitor-inductor filter cabinet, a rectifier cabinet, an inverter cabinet and a water cooling cabinet which are arranged side by side in sequence. The water cooling cabinet is internally provided with a water pump and a cold-heat exchanger, the water pump and the cold-heat exchanger are communicated with the heat generating elements of the cabinet bodies through internal cold-heat exchange pipelines, and the water cooling cabinet is communicated with an external cooling source through external cold-heat exchange pipelines. The liquid cooling mode is adopted to replace the traditional air cooling, the core defects that the existing marine low-voltage cabinet has low air cooling heat dissipation efficiency, high noise and cannot meet the long-time high-load operation requirement are solved, the heat dissipation efficiency is significantly improved, the equipment operation noise is reduced to below 50 dB, and the application is especially suitable for the application scenarios of compact space, high heat dissipation requirement such as a marine main propulsion low-voltage cabinet.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment heat dissipation technology, and specifically relates to a low-voltage cabinet liquid cooling system. Background Technology

[0002] Low-voltage switchgear is an important piece of equipment in power systems used to distribute electrical energy and control the switching on and off of circuits. It is widely used in industries such as industry, construction, and shipbuilding. Among them, marine low-voltage switchgear, due to the limited space on ships, harsh operating environment, and the need for 24-hour uninterrupted operation, places extremely high demands on heat dissipation performance.

[0003] In existing technologies, low-voltage switchgear commonly uses air cooling, which involves installing a cooling fan on the cabinet to remove heat generated by the heat-generating components inside the cabinet through air convection. However, this cooling method has the following unavoidable core technical defects: 1. The thermal conductivity of air is much lower than that of liquids. Air cooling cannot meet the heat dissipation requirements of high-power low-voltage switchgear, especially marine main propulsion AFEPS low-voltage switchgear, whose rectifier and inverter units have high power and generate a lot of heat. Air cooling can easily lead to excessively high internal temperature, accelerate component aging, and even cause equipment failure.

[0004] 2. In order to ensure heat dissipation, multiple high-power cooling fans need to be installed, which generate noise exceeding 85dB during operation, seriously affecting the working environment of ship crew members.

[0005] 3. Air cooling requires numerous ventilation holes in the cabinet, which can easily allow dust and moisture to enter, leading to short circuits and corrosion of components, thus reducing the reliability and lifespan of the equipment.

[0006] 4. The cooling fan and ventilation channel occupy a large amount of space inside the cabinet, which increases the size of the low-voltage cabinet and cannot meet the compact space requirements of ships.

[0007] In view of the above-mentioned shortcomings of existing technologies, there is currently no effective solution in the industry. Therefore, the development of a low-pressure cabinet liquid cooling system with high heat dissipation efficiency, low noise, good dust and water resistance, and high space utilization has become an urgent need in the field of marine electrical systems. Summary of the Invention

[0008] In view of the problems mentioned in the background technology above, the purpose of this invention is to provide a liquid cooling system for low-pressure cabinets. This invention uses liquid cooling to replace traditional air cooling, which solves the core defects of existing marine low-pressure cabinets, such as low heat dissipation efficiency, high noise, and inability to meet the requirements of long-term high-load operation. The heat dissipation efficiency is significantly improved, and the equipment operating noise is reduced to below 50dB. It is particularly suitable for applications with compact space and high heat dissipation requirements, such as marine main propulsion low-pressure cabinets.

[0009] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A low-pressure switchgear liquid cooling system includes a switchgear assembly and a liquid cooling unit; The cabinet assembly includes a circuit breaker cabinet, a pre-charge cabinet, an inductor-capacitor-inductor filter cabinet, a rectifier cabinet, an inverter cabinet, and a water-cooled cabinet, with each cabinet arranged in a fixed, parallel configuration. The liquid cooling unit includes a water-cooled cabinet, which is fixedly connected to one side of the cabinet assembly, forming an integrated cabinet assembly structure. The water-cooled cabinet is equipped with a water pump and a heat exchanger, which are connected by pipes. The water-cooled cabinet and the cabinet assembly are connected by internal heat exchange pipes, which extend into the interior of the circuit breaker cabinet, pre-charge cabinet, inductor-capacitor-inductor filter cabinet, rectifier cabinet, inverter cabinet and water-cooled cabinet, respectively, and come into contact with the heating elements of each cabinet. The heat exchanger is connected to an external heat exchange pipe, which extends outside the water-cooled cabinet and is used to connect to an external cooling source.

[0010] Further specified, the circuit breaker cabinet, pre-charge cabinet, inductor-capacitor-inductor filter cabinet, rectifier cabinet, inverter cabinet, and water-cooled cabinet are arranged side by side from left to right, and adjacent cabinets are fixedly connected by bolts.

[0011] Further specified, the water pump is fixedly installed above the heat exchanger, the water pump outlet is connected to the water inlet of the internal heat exchange pipe, and the water pump inlet is connected to the internal cold water outlet of the heat exchanger.

[0012] Further specifying, the heat exchanger is a plate heat exchanger, which has independent internal and external flow channels. The internal flow channels are connected to internal heat exchange pipes, and the external flow channels are connected to external heat exchange pipes.

[0013] Further specified, the top of the heat exchanger is provided with a hot water inlet and a hot water outlet, and the bottom of the heat exchanger is provided with a cold water outlet and a cold water inlet; The hot water inlet is connected to the outlet of the internal heat exchange pipe, the cold water outlet is connected to the inlet of the water pump, the cold water inlet is connected to the inlet of the external heat exchange pipe, and the hot water outlet is connected to the outlet of the external heat exchange pipe.

[0014] Further specifying, the internal hot and cold exchange pipes include a cold water inlet pipe and a hot water inlet pipe, the two pipes being arranged in parallel and extending into the interior of each cabinet respectively; The inlet end of the cold water inlet pipe is connected to the outlet of the water pump, and the outlet end of the hot water inlet pipe is connected to the hot water inlet of the heat exchanger.

[0015] Further specified, both the cold water inlet pipe and the hot water inlet pipe are provided with multiple branch interfaces, each branch interface being connected to the cooling channel of the heating element in the corresponding cabinet; the water inlet end of the cooling channel in each cabinet is connected to the branch interface of the cold water inlet pipe, and the water outlet end is connected to the branch interface of the hot water inlet pipe.

[0016] Furthermore, the circuit breaker cabinet, pre-charge cabinet, inductor-capacitor-inductor filter cabinet, rectifier cabinet, inverter cabinet and water-cooled cabinet are all provided with pipe through holes on the side walls of the cabinet, and the internal hot and cold exchange pipes extend into the cabinet through the pipe through holes.

[0017] Furthermore, the water-cooled cabinet has two pipe interfaces on its side wall, and the inlet and outlet of the external heat exchange pipes extend to the outside of the water-cooled cabinet through the two pipe interfaces respectively.

[0018] Furthermore, the water-cooled cabinet is a marine water-cooled heat dissipation device, and the entire unit is made of corrosion-resistant materials.

[0019] The beneficial effects of this invention are: In this invention, the coolant is input to the heat exchanger via an external interface. The water pump drives the coolant out of the heat exchanger and circulates it through cold pipes to the heating device. The heat from the heating device is carried away by the circulating coolant along the pipes. After returning to the heat exchanger, the heated coolant is output from the heat outlet of the heat exchanger, completing a complete loop of "cold coolant in - passing through the heating device - heated coolant out". This achieves the effect of removing the heat from the heating device, while also extending the working time of each device, improving device efficiency, and extending the life of each device.

[0020] The present invention significantly improves heat dissipation efficiency by using liquid as the cooling medium, which has a thermal conductivity that is tens of times greater than that of air. The heat dissipation efficiency is several times higher than that of traditional air cooling, effectively removing the heat generated by high-power heating elements and ensuring that the temperature of the low-voltage switchgear remains stable within the allowable range during long-term high-load operation.

[0021] This invention eliminates the traditional cooling fan, retaining only a low-noise water pump, reducing system operating noise to below 50dB and significantly improving the working environment. The cabinet requires no ventilation holes, achieving an IP54 or higher protection rating, effectively preventing dust and moisture from entering the cabinet, avoiding component corrosion and short circuits, and extending equipment lifespan.

[0022] The liquid cooling system of this invention has a compact structure, with the water-cooled cabinet and the cabinet assembly integrated together, requiring no additional space, making it particularly suitable for space-constrained applications such as ships; in addition, this system adopts a closed-loop design, with the cooling medium flowing in a closed pipeline, which is not easy to leak, simple to maintain, and can meet the requirements of 24-hour uninterrupted operation of ships. Attached Figure Description

[0023] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of an embodiment of a low-pressure cabinet liquid cooling system according to the present invention; Figure 2 This is a front view of an embodiment of a low-pressure cabinet liquid cooling system according to the present invention; Figure 3 This is a side view of an embodiment of a low-pressure cabinet liquid cooling system according to the present invention; Figure 4 This is a schematic diagram of the internal structure of a water-cooled cabinet according to an embodiment of a low-pressure liquid cooling system of the present invention; Figure 5 This is a schematic diagram of the heat exchanger structure of an embodiment of a low-pressure cabinet liquid cooling system according to the present invention.

[0024] The symbols for the main components are explained as follows: Circuit breaker cabinet 1, pre-charge cabinet 2, inductor-capacitor-inductor filter cabinet 3, rectifier cabinet 4, inverter cabinet 5, water-cooled cabinet 6, water pump 61, heat exchanger 62, external heat exchange pipe 63, internal heat exchange pipe 64, hot water inlet 65, hot water outlet 66, cold water outlet 67, cold water inlet 68, cold water inlet pipe 69, hot water inlet pipe 70, branch interface 71. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0027] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] like Figure 1 As shown, a low-pressure cabinet liquid cooling system of the present invention includes a cabinet assembly and a liquid cooling unit; The cabinet assembly includes a circuit breaker cabinet 1, a pre-charging cabinet 2, an inductor-capacitor-inductor filter cabinet 3, a rectifier cabinet 4, an inverter cabinet 5, and a water-cooled cabinet 6, with each cabinet connected in a fixed manner in parallel. The liquid cooling unit includes a water-cooled cabinet 6, which is fixedly connected to one side of the cabinet assembly, forming an integral cabinet assembly structure with the cabinet assembly. The water-cooled cabinet 6 is internally equipped with a water pump 61 and a heat exchanger 62, which are connected by pipes. The water-cooled cabinet 6 is connected to the cabinet assembly by an internal heat exchange pipe 64, which extends into the interior of the circuit breaker cabinet 1, the pre-charge cabinet 2, the inductor-capacitor-inductor filter cabinet 3, the rectifier cabinet 4, the inverter cabinet 5, and the water-cooled cabinet 6, respectively, and comes into contact with the heating elements of each cabinet. The heat exchanger 62 is connected to an external heat exchange pipe 63, which extends out of the water-cooled cabinet 6 and is used to communicate with an external cooling source.

[0029] In the practical application of this embodiment, the circuit breaker cabinet 1, pre-charge cabinet 2, inductor-capacitor-inductor filter cabinet 3, rectifier cabinet 4, inverter cabinet 5, and water-cooled cabinet 6 are arranged side by side from left to right, and adjacent cabinets are fixedly connected by bolts.

[0030] In the practical application of this embodiment, the water pump 61 is fixedly installed above the heat exchanger 62, the outlet of the water pump 61 is connected to the inlet of the internal heat exchange pipe 64, and the inlet of the water pump 61 is connected to the internal cold water outlet of the heat exchanger 62.

[0031] In the practical application of this embodiment, the heat exchanger 62 is a plate heat exchanger, which has independent internal flow channels and external flow channels. The internal flow channels are connected to the internal heat exchange pipes 64, and the external flow channels are connected to the external heat exchange pipes 63.

[0032] In the practical application of this embodiment, the top of the heat exchanger 62 is provided with a hot water inlet 65 and a hot water outlet 66, and the bottom of the heat exchanger 62 is provided with a cold water outlet 67 and a cold water inlet 68. The hot water inlet 65 is connected to the outlet of the internal heat exchange pipe 64, the cold water outlet 67 is connected to the inlet of the water pump 61, the cold water inlet 68 is connected to the inlet of the external heat exchange pipe 63, and the hot water outlet 66 is connected to the outlet of the external heat exchange pipe 63.

[0033] In the practical application of this embodiment, the internal hot and cold exchange pipe 64 includes a cold water inlet pipe 69 and a hot water inlet pipe 70, which are arranged in parallel and extend into the interior of each cabinet respectively. The inlet end of the cold water inlet pipe 69 is connected to the outlet of the water pump 61, and the outlet end of the hot water inlet pipe 70 is connected to the hot water inlet 65 of the heat exchanger 62.

[0034] In the practical application of this embodiment, both the cold water inlet pipe 69 and the hot water inlet pipe 70 are provided with multiple branch interfaces 71. Each branch interface 71 is connected to the cooling channel of the heating element in the corresponding cabinet. The water inlet end of the cooling channel in each cabinet is connected to the branch interface 71 of the cold water inlet pipe 69, and the water outlet end is connected to the branch interface 71 of the hot water inlet pipe 70.

[0035] In the practical application of this embodiment, the circuit breaker cabinet 1, pre-charge cabinet 2, inductor-capacitor-inductor filter cabinet 3, rectifier cabinet 4, inverter cabinet 5 and water-cooled cabinet 6 are all provided with pipe through holes on the side walls of the cabinet, and the internal hot and cold exchange pipes 64 extend into the cabinet through the pipe through holes.

[0036] In the practical application of this embodiment, two pipe interfaces are provided on the side wall of the water-cooled cabinet 6, and the inlet and outlet of the external heat exchange pipe 63 extend to the outside of the water-cooled cabinet 6 through the two pipe interfaces respectively.

[0037] In the practical application of this embodiment, the water-cooled cabinet 6 is a marine water-cooled heat dissipation device, and the entire unit is made of corrosion-resistant materials. Specifically, the low-voltage cabinet is a marine main propulsion AFE PS low-voltage cabinet, and the use of corrosion-resistant materials meets the requirements for use in the marine environment.

[0038] The core working principle of this invention is dual-circulation liquid cooling, which transfers the heat generated by the heating elements inside the cabinet to the external environment through the synergistic effect of internal and external circulation. During internal circulation, the water pump drives the cooling liquid to flow in the internal heat exchange pipe 64. The cooling liquid first enters the interior of each cabinet, exchanges heat with the heating element, absorbs heat and rises in temperature, becoming hot water. The hot water flows back to the internal flow channel of the heat exchanger 62 through the internal pipe.

[0039] During external circulation, the cold water supplied by the external cooling source enters the external flow channel of the heat exchanger 62 through the external heat exchange pipe 63, and exchanges heat with the hot water in the internal flow channel, taking away the heat from the hot water; the cold water that has absorbed heat becomes hot water and flows back to the external cooling source through the external pipe for cooling.

[0040] During the heat exchange process, the internal flow channels inside the heat exchanger 62 are isolated from the external flow channels. Heat transfer is achieved through metal plates, realizing the transfer of internal circulating heat to external circulating heat, thereby ensuring that the internal circulating cooling liquid always maintains a low temperature.

[0041] When in use, after the system is started, the water pump 61 starts running, driving the cooling liquid to flow in the internal circulation pipe.

[0042] Cooling liquid flows out from the outlet of water pump 61, enters cold water inlet pipe 69, and enters the cooling channels of heating elements inside each cabinet through branch interface 71.

[0043] The cooling liquid exchanges heat with the heating element in the cooling channel, absorbs heat and rises in temperature, becoming hot water. It then flows into the hot water inlet pipe 70 and returns to the hot water inlet 65 at the top of the heat exchanger 62, entering the internal channel of the heat exchanger. At the same time, the cold water provided by the ship's central cooling water system enters the cold water inlet 68 at the bottom of the heat exchanger 62 through the external heat exchange pipe 63, entering the external channel of the heat exchanger.

[0044] Hot water in the internal flow channel and cold water in the external flow channel exchange heat through stainless steel plates. Heat from the hot water is transferred to the cold water, causing the hot water to cool and become cold water. This cold water flows out from the cold water outlet 67 at the bottom of the heat exchanger 62 and enters the inlet of the water pump 61, completing the internal circulation. The cold water, having absorbed heat, becomes hot water and flows out from the hot water outlet 66 at the top of the heat exchanger 62. It then flows back to the ship's central cooling water system through the external heat exchange pipe 63 for cooling, completing the external circulation. The system operates continuously, constantly transferring the heat generated by the heating elements inside the cabinet to the external environment, ensuring that the temperature of the low-pressure cabinet remains stable within the normal operating range.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A low-pressure switchgear liquid cooling system, characterized in that: Includes cabinet assembly and liquid cooling unit; The cabinet group includes a circuit breaker cabinet (1), a pre-charge cabinet (2), an inductor-capacitor-inductor filter cabinet (3), a rectifier cabinet (4), an inverter cabinet (5), and a water-cooled cabinet (6), with each cabinet connected in a fixed manner in parallel; the liquid cooling unit includes a water-cooled cabinet (6), which is fixedly connected to one side of the cabinet group, forming an integral cabinet group structure with the cabinet group; The water-cooled cabinet (6) is equipped with a water pump (61) and a heat exchanger (62) which are connected by a pipe. The water pump (61) and the heat exchanger (62) are connected by an internal heat exchange pipe (64) to the cabinet assembly. The internal heat exchange pipe (64) extends to the interior of the circuit breaker cabinet (1), the pre-charge cabinet (2), the inductor-capacitor-inductor filter cabinet (3), the rectifier cabinet (4), the inverter cabinet (5), and the water-cooled cabinet (6), respectively, and contacts the heating elements of each cabinet. The heat exchanger (62) is connected to an external heat exchange pipe (63), which extends out of the water-cooled cabinet (6) and is used to communicate with an external cooling source.

2. The low-pressure switchgear liquid cooling system according to claim 1, characterized in that: The circuit breaker cabinet (1), pre-charge cabinet (2), inductor-capacitor-inductor filter cabinet (3), rectifier cabinet (4), inverter cabinet (5), and water-cooled cabinet (6) are arranged side by side from left to right, and adjacent cabinets are fixedly connected by bolts.

3. The low-pressure switchgear liquid cooling system according to claim 1, characterized in that: The water pump (61) is fixedly installed above the heat exchanger (62). The outlet of the water pump (61) is connected to the inlet of the internal heat exchange pipe (64). The inlet of the water pump (61) is connected to the internal cold water outlet of the heat exchanger (62).

4. The low-pressure switchgear liquid cooling system according to claim 1, characterized in that: The heat exchanger (62) is a plate heat exchanger, which has independent internal and external flow channels. The internal flow channels are connected to the internal heat exchange pipe (64), and the external flow channels are connected to the external heat exchange pipe (63).

5. A low-pressure switchgear liquid cooling system according to claim 4, characterized in that: The top of the heat exchanger (62) is provided with a hot water inlet (65) and a hot water outlet (66), and the bottom of the heat exchanger (62) is provided with a cold water outlet (67) and a cold water inlet (68). The hot water inlet (65) is connected to the outlet of the internal heat exchange pipe (64), the cold water outlet (67) is connected to the inlet of the water pump (61), the cold water inlet (68) is connected to the inlet of the external heat exchange pipe (63), and the hot water outlet (66) is connected to the outlet of the external heat exchange pipe (63).

6. The low-pressure switchgear liquid cooling system according to claim 1, characterized in that: The internal hot and cold exchange pipe (64) includes a cold water inlet pipe (69) and a hot water inlet pipe (70), which are arranged in parallel and extend into the interior of each cabinet. The inlet end of the cold water inlet pipe (69) is connected to the outlet of the water pump (61), and the outlet end of the hot water inlet pipe (70) is connected to the hot water inlet (65) of the heat exchanger (62).

7. A low-pressure switchgear liquid cooling system according to claim 6, characterized in that: Both the cold water inlet pipe (69) and the hot water inlet pipe (70) are provided with multiple branch interfaces (71), each branch interface (71) is connected to the cooling channel of the heating element in the corresponding cabinet; the water inlet end of the cooling channel in each cabinet is connected to the branch interface (71) of the cold water inlet pipe (69), and the water outlet end is connected to the branch interface (71) of the hot water inlet pipe (70).

8. A low-pressure switchgear liquid cooling system according to claim 1, characterized in that: The circuit breaker cabinet (1), pre-charge cabinet (2), inductor-capacitor-inductor filter cabinet (3), rectifier cabinet (4), inverter cabinet (5) and water-cooled cabinet (6) are all provided with pipe through holes on the side walls of the cabinet, and the internal hot and cold exchange pipes (64) extend into the cabinet through the pipe through holes.

9. The low-pressure switchgear liquid cooling system according to claim 1, characterized in that: Two pipe interfaces are provided on the side wall of the water-cooled cabinet (6). The inlet and outlet of the external heat exchange pipe (63) extend to the outside of the water-cooled cabinet (6) through the two pipe interfaces respectively.

10. The low-pressure switchgear liquid cooling system according to claim 1, characterized in that: The water-cooled cabinet (6) is a marine water-cooled heat dissipation device, and the whole is made of corrosion-resistant materials.

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