Air-water mixed cooling frequency converter

Abstract

The utility model relates to an air-water mixed cooling frequency converter, which comprises a control cabinet, a power cabinet and a grid-connected cabinet, the interior of the power cabinet is divided into a power module area, a capacitor area and a reactor area, the capacitor area and the reactor area adopt an air cooling mode to dissipate heat, and the power module area adopts a liquid cooling and air cooling mixed mode to dissipate heat; wherein the first water-cooling heat exchanger and the first fan are used as a first combination body to be pulled out of the whole machine cabinet body to be placed, the first combination body is connected with a liquid-cooling integrated module in a liquid-cooling heat dissipation system in the power module area through a pipeline for heat exchange, and a second combination body used for internal circulation is arranged in the capacitor area and / or the power module area. And the heat exchanger is connected with the liquid-cooling integrated module for heat exchange. Compared with the prior art, except for a reactance area, the whole power cabinet exchanges heat with external environment wind only through the water side in the pipeline, is completely isolated from the external environment wind, and is suitable for severe environments such as high humidity, high corrosion, high sandstorm and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to an air-water mixed cooling frequency converter. Background Art

[0002] At present, there are related studies on hybrid cooling inverters. After searching, Chinese invention patent application CN117498652A discloses a hybrid cooling inverter, which adopts a cabinet partition design, including a control cabinet, a power cabinet and a grid cabinet connected in sequence. The power cabinet is partitioned according to the heating conditions of the internal components and the characteristics of the components. The inverter adopts air cooling to dissipate heat externally, and the specific partitions in the power cabinet adopt liquid cooling to dissipate heat.

[0003] However, in the above hybrid cooling inverter, especially the power cabinets, each area is directly in contact with the outside world for air cooling, which is difficult to be applied to harsh environments such as high humidity, high corrosion, and high wind and sand. Summary of the invention

[0004] The purpose of the utility model is to provide an air-water mixed cooling frequency converter suitable for harsh environments such as high humidity, high corrosion, high wind and sand.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An air-water hybrid cooling frequency converter comprises a control cabinet, a power cabinet and a grid-connected cabinet. The interior of the power cabinet is divided into a power module area, a capacitor area and a reactor area. The capacitor area and the reactor area are cooled by air cooling. The power module area is cooled by a liquid cooling and air cooling hybrid method. The power module area is cooled by a liquid cooling heat dissipation system. The liquid cooling heat dissipation system comprises a cold plate arranged on the side of the power module area and a liquid cooling integrated module for exchanging heat for the cold plate.

[0007] The first water-cooled heat exchanger and the first fan are pulled as a first combination to the outside of the whole cabinet and placed. The first combination is connected to the pipeline of the liquid-cooled integrated module. The hot liquid output by the liquid-cooled integrated module is connected to the water side inlet of the first water-cooled heat exchanger through the pipeline. After the first water-cooled heat exchanger and the ambient cold air brought in by the first fan are converted into cold liquid through heat exchange, the cold liquid is transported back to the liquid-cooled integrated module through the pipeline from the water side outlet of the first water-cooled heat exchanger;

[0008] A second combination for internal circulation is arranged in the capacitor area and / or the power module area, including a second water-cooled heat exchanger and a second fan; the cold liquid output by the liquid-cooled integrated module is connected to the water side inlet of the second water-cooled heat exchanger through a pipeline, is output from the water side outlet of the second water-cooled heat exchanger and is connected back to the liquid-cooled integrated module through a pipeline, and the second fan blows the hot air flow from the capacitor area and the power module area to the wind side of the second water-cooled heat exchanger, and outputs a cold air flow after heat exchange with the cold liquid on the water side.

[0009] Preferably, the power cabinet is entirely sealed except for the reactor area, and is only connected to the first water-cooled heat exchanger through a pipeline for heat exchange contact with the outside.

[0010] Preferably, the reactor area in the power cabinet adopts external direct air cooling to dissipate heat.

[0011] Preferably, the interior of the reactor region is subjected to a device body anti-corrosion protection reinforcement treatment.

[0012] Preferably, the power cabinet is thermally fully enclosed as a whole, and a fourth assembly for internal circulation is provided in the reactor area, wherein the fourth assembly includes a fourth heat exchanger and a fourth fan;

[0013] The cold end input of the fourth heat exchanger is connected to the cold end output of the liquid cooling integrated module, and the cold end output of the fourth heat exchanger is connected to the cold end input of the liquid cooling integrated module;

[0014] After the fourth fan starts working, a hot air flow is formed in the reactor area, and then a cold air flow is output after heat exchange with the cold-end water body through the fourth heat exchanger.

[0015] Preferably, a third assembly for internal circulation is provided in the grid-connected cabinet, and the third assembly includes a third heat exchanger and a third fan;

[0016] The cold end input of the third heat exchanger is connected to the cold end output of the liquid cooling integrated module, and the cold end output of the third heat exchanger is connected to the cold end input of the liquid cooling integrated module;

[0017] After the third fan starts working, a hot air flow is formed in the grid-connected cabinet, and then a cold air flow is output after heat exchange with the cold-end water body through the third heat exchanger.

[0018] Preferably, a third assembly for internal circulation is provided in the grid-connected cabinet, and the third assembly includes a third heat exchanger and a third fan;

[0019] The cold end input of the third heat exchanger is connected to the cold end output of the liquid cooling integrated module, and the cold end output of the third heat exchanger is connected to the cold end input of the liquid cooling integrated module;

[0020] After the third fan starts working, a hot air flow is formed in the grid-connected cabinet, and then a cold air flow is output after heat exchange with the cold-end water body through the third heat exchanger.

[0021] Preferably, the grid-connected cabinet is a fully enclosed thermal configuration as a whole, and is only connected to the liquid-cooled integrated module through a pipeline for heat exchange.

[0022] Preferably, a fully enclosed thermal configuration is adopted in the control cabinet, in which an air duct is arranged, which is only connected to the power module area for air cooling and heat dissipation.

[0023] Preferably, the first combination is arranged at a corresponding position of the entire cabinet according to actual requirements of the application scenario.

[0024] Preferably, the housing of the first assembly is provided with a device corrosion protection design.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1) The first water-cooled heat exchanger and the first fan are pulled as a first combination to the outside of the whole cabinet and placed. Except for the reactance area, the entire power cabinet only exchanges heat with the external ambient wind through the water side in the pipeline, and is completely isolated from the external ambient wind. It is suitable for harsh environments such as high humidity, high corrosion, and high wind and sand.

[0027] 2) A second assembly for internal circulation is added to the power cabinet in addition to the reactance area, and the water-side heat exchange provided by the existing liquid cooling integrated module design is borrowed, which has a simple structure and low cost.

[0028] 3) The reactor area of ​​the power cabinet is easy to be designed with corrosion protection and protection enhancement, so the direct air cooling method is maintained to reduce costs, installation difficulty and operation and maintenance difficulty; or the reactor area of ​​the power cabinet also adopts the heat exchanger + fan internal circulation method, that is, the entire power cabinet is fully enclosed, and the environmental isolation effect is better. Choose the corresponding method according to the actual environmental requirements.

[0029] 4) The cabinet adopts a fully enclosed thermal design with good isolation performance.

[0030] 5) The grid-connected cabinet generates a large amount of heat (≥10KW) and has dispersed devices. If the device anti-corrosion protection is enhanced, it is extremely difficult and costly. The grid-connected cabinet in the utility model also adopts a heat exchanger + fan internal circulation method. Heat exchange is only performed by connecting the water side of the water-cooled heat exchanger to the liquid cooling integrated area. This is the most reasonable and low-cost method. The whole cabinet has no contact with the external environment and is suitable for harsh environments such as high humidity, high corrosion, and high wind and sand.

[0031] 6) The first combination is set at the corresponding position outside the whole cabinet according to the space requirements of the application scenario, which is more applicable.

[0032] 7) The shell of the first assembly is provided with device anti-corrosion and protection design, which is more suitable for harsh environments such as high humidity, high corrosion, and high wind and sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the overall structure of the air-water hybrid inverter in Example 1;

[0034] Figure 2 It is a side view of the power cabinet in Example 1;

[0035] Figure 3 The overall structure diagram of the air-water hybrid inverter in Example 2

[0036] Reference numerals:

[0037] 1-control cabinet; 2-power cabinet, 21-capacitor area, 22-power module area, 23-reactor area, 24-liquid cooling integrated module, 25-first assembly, 26-second assembly, 27-fourth assembly; 3-grid-connected cabinet, 31-third assembly. DETAILED DESCRIPTION

[0038] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In conjunction with the accompanying drawings, some embodiments of the present utility model are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] like Figure 1 As shown, this embodiment provides an air-water hybrid cooling inverter, including a control cabinet 1, a power cabinet 2 and a grid cabinet 3. The power cabinet 2 is internally divided into a power module area 22, a capacitor area 21 and a reactor area 23. The capacitor area 21 and the reactor area 23 are cooled by air cooling, and the power module area 22 is cooled by a liquid cooling and air cooling hybrid method. The power module area 22 is cooled by a liquid cooling system;

[0042] The liquid cooling system includes a cold plate arranged on the side of the power module area 22, and a liquid cooling integrated module 24 for exchanging heat for the cold plate. The first water-cooled heat exchanger and the first fan are pulled as a first assembly 25 to the outside of the entire cabinet and placed. The first assembly 25 is connected to the liquid cooling integrated module 24 through a pipeline. The hot liquid output by the liquid cooling integrated module 24 is connected to the water side inlet of the first water cooling heat exchanger through a pipeline. After the first water cooling heat exchanger and the ambient cold air brought in by the first fan are converted into cold liquid through heat exchange, the hot liquid is transported back to the liquid cooling integrated module 24 through a pipeline from the water side outlet of the first water cooling heat exchanger.

[0043] A second assembly 26 for internal circulation is provided in the capacitor area 21 and / or the power module area 22, including a second water-cooled heat exchanger and a second fan; the cold liquid output by the liquid-cooled integrated module 24 is connected to the water side inlet of the second water-cooled heat exchanger through a pipeline, is output from the water side outlet of the second water-cooled heat exchanger and is connected back to the liquid-cooled integrated module 24 through a pipeline, and the second fan blows the hot air flow from the capacitor area 21 and the power module area 22 into the wind side of the second water-cooled heat exchanger, and outputs the cold air flow after heat exchange with the cold liquid on the water side.

[0044] Next, each part is introduced in detail.

[0045] 1. Power cabinet

[0046] like Figure 1 As shown, in this embodiment, the capacitor area 21, the power module area 22, and the reactor area 23 are arranged in the power cabinet from top to bottom. Here, only one relative position layout of each area is described. The above partitions can also be adjusted accordingly according to actual needs. For example, the capacitor area 21 can also be arranged as follows Figure 2 As shown in 22-1 and 22-2.

[0047] The power module area 22 uses a mixed method of liquid cooling and air cooling to dissipate heat. This embodiment introduces a cold plate to achieve forced liquid cooling for electronic devices that generate high heat and are sensitive to temperature, which not only meets the high heat flux density heat dissipation requirements of power devices, but also meets their temperature uniformity requirements. The layout of this area adopts a parallel cold plate form, which is concentrated and arranged in parallel in the middle and upper part of the power cabinet. The components of the power module area 22 in this embodiment include but are not limited to AC copper busbars, IGBT stacks, and capacitor stacks.

[0048] In this embodiment, the power module area 22 is liquid-cooled by a liquid-cooling system; the liquid-cooling system includes a cold plate arranged on the side of the power module area 22, and a water-cooled heat exchanger and a liquid-cooling integrated module 24 arranged in the power cabinet, and the liquid-cooling integrated module 24 includes a power source (a water pump in this embodiment) and a piping subsystem for supplying liquid to the cold plate; the power source of the liquid-cooling integrated module 24 drives the heat exchange flow to transfer the heat of the components in the power module area 22 to the cold plate, and the heat of the cold plate is brought to the external atmospheric environment by the first water-cooling heat exchanger arranged outside the cabinet.

[0049] The liquid-cooled integrated module 24 is a water pump and piping subsystem for supplying liquid to the cold plate (the coolant is not limited to water, a mixture of water and ethylene glycol, a multiphase fluid, a refrigerant, etc.), and is arranged in the middle of the power cabinet, that is, directly below the power module (this embodiment is arranged in the middle of the power cabinet 22, but the liquid-cooled integrated module 24 is more flexible in position due to its high design integration, and can also be arranged at the bottom of the power cabinet 22, or even the control cabinet 21, and the grid-connected cabinet 23). This layout makes the liquid-cooled integrated module 24 compact in design and easy to install and maintain; at the same time, the special liquid filling, drainage, exhaust and liquid collection design of the liquid-cooled integrated module 24 basically avoids the electrical safety risks caused by the leakage of coolant in the liquid-cooled inverter / converter cabinet, and the heat exchange of the cold plate ultimately needs to be brought into the atmospheric environment by the first water-cooled heat exchanger.

[0050] In addition, the liquid cooling integrated module 24 is embedded with a water pipe heater. In a low temperature environment (such as -40°C), it can ensure that the operating temperature of key components meets the requirements. In addition, the water pipe heater is also connected to a humidity control device, which can not only meet the low temperature heating requirements, but also control the humidity in the cabinet, ensuring that the working humidity of key components meets the requirements.

[0051] In this embodiment, the first water-cooled heat exchanger and the first fan are pulled as a first assembly to the outside of the whole cabinet and placed. The first assembly is arranged above the whole cabinet or behind the whole cabinet according to the actual needs of the application scenario, which is convenient for installation and operation and maintenance. The shell of the first assembly is provided with device anti-corrosion and protection design (for example, anti-corrosion coating layer, sealing gasket at the cabinet installation, etc.), which is more suitable for harsh environments such as high humidity, high corrosion, and high wind and sand.

[0052] The power cabinet is fully enclosed except for the reactor area, and is only connected to the first water-cooled heat exchanger through pipes and in contact with the outside heat exchange. The internal air duct is designed, and the protection level is not less than IP65. The reactor area in the power cabinet is easy to be designed with corrosion protection and protection enhancement, so the direct air cooling method is maintained to further reduce the cost of the whole machine.

[0053] In this embodiment, the first assembly 25 is arranged above the entire cabinet or behind the entire cabinet according to the actual needs of the application scenario, and the shell of the first assembly 25 is provided with device anti-corrosion and protection design.

[0054] 2. Grid-connected cabinet

[0055] This embodiment considers that the heat generating components in the cabinet are circuit breakers, contactors, copper busbars, cables and other components with high heat generation and strong temperature resistance, and still adopts the forced air cooling method with good heat dissipation effect and low cost.

[0056] As another preferred embodiment, a third assembly 31 for internal circulation is provided in the grid cabinet 3, and the third assembly includes a third heat exchanger and a third fan; the cold end input of the third heat exchanger is connected to the cold end output of the liquid cooling integrated module 24, and the cold end output of the third heat exchanger is connected to the cold end input of the liquid cooling integrated module 24; the hot air flow formed in the grid cabinet after the third fan works exchanges heat with the cold end water body through the third heat exchanger and then outputs a cold air flow. The grid cabinet 3 is a fully enclosed thermal setting as a whole, and is only connected to the liquid cooling integrated module 24 through a pipeline for heat exchange.

[0057] 3. Control cabinet

[0058] In this embodiment, all the components in the cabinet are control components, and the total heat generation is small, so low-cost natural heat dissipation can meet the needs. Alternatively, a fully enclosed thermal setting is adopted in the control cabinet 1, and an air duct is arranged inside, which is only connected to the power module area 22 or the capacitor area 21 for air cooling and heat dissipation, and the heat dissipation performance is better.

[0059] Figure 1 and Figure 2 In the figure, the red arrows indicate hot air flow, the green arrows indicate cold diversion, and the light green arrows indicate cold air flow with slightly higher temperature.

[0060] Example 2

[0061] like Figure 3 As shown, in this embodiment, the entire power cabinet 2 is thermally fully enclosed as a whole, and the overall corrosion and wind sand isolation capability is stronger, that is, a fourth assembly 27 used for internal circulation is also arranged in the reactor area 23, and the fourth assembly 27 includes a fourth heat exchanger and a fourth fan, and the cold end input of the fourth heat exchanger is connected to the cold end output of the liquid cooling integrated module, and the cold end output of the fourth heat exchanger is connected to the cold end input of the liquid cooling integrated module. After the fourth fan works, the hot air flow formed in the reactor area 23 exchanges heat with the cold end water body through the fourth heat exchanger and outputs a cold air flow.

[0062] The control cabinet 1 adopts a fully enclosed thermal setting, in which an air duct is arranged, and is only connected to the power module area 22 or the capacitor area 21 or the reactor area for air cooling and heat dissipation, so the heat dissipation performance is better.

[0063] The scheme setting of this embodiment is particularly suitable for high humidity, high corrosion, and high wind and sand scenes.

[0064] The other settings in this embodiment are the same as those in Embodiment 1.

[0065] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An air-water hybrid cooling inverter, comprising a control cabinet, a power cabinet and a grid-connected cabinet, wherein the interior of the power cabinet is divided into a power module area, a capacitor area and a reactor area, wherein the capacitor area and the reactor area are cooled by air cooling, wherein the power module area is cooled by a liquid cooling and air cooling hybrid method, wherein the power module area is cooled by a liquid cooling system, wherein the liquid cooling system comprises a cold plate arranged on the side of the power module area, and a liquid cooling integrated module for exchanging heat for the cold plate, wherein: The first water-cooled heat exchanger and the first fan are pulled as a first combination to the outside of the whole cabinet and placed. The first combination is connected to the pipeline of the liquid-cooled integrated module. The hot liquid output by the liquid-cooled integrated module is connected to the water side inlet of the first water-cooled heat exchanger through the pipeline. After the first water-cooled heat exchanger and the ambient cold air brought in by the first fan are converted into cold liquid through heat exchange, the cold liquid is transported back to the liquid-cooled integrated module through the pipeline from the water side outlet of the first water-cooled heat exchanger; A second combination for internal circulation is arranged in the capacitor area and / or the power module area, including a second water-cooled heat exchanger and a second fan; the cold liquid output by the liquid-cooled integrated module is connected to the water side inlet of the second water-cooled heat exchanger through a pipeline, is output from the water side outlet of the second water-cooled heat exchanger and is connected back to the liquid-cooled integrated module through a pipeline, and the second fan blows the hot air flow from the capacitor area and the power module area to the wind side of the second water-cooled heat exchanger, and outputs a cold air flow after heat exchange with the cold liquid on the water side.

2. The air-water mixed cooling inverter according to claim 1, characterized in that: The power cabinet is a fully enclosed thermal arrangement except for the reactor area, and is only connected to the first water-cooled heat exchanger through a pipeline and in contact with the outside for heat exchange.

3. The air-water mixed cooling inverter according to claim 2, characterized in that: The reactor area in the power cabinet adopts external direct air cooling to dissipate heat.

4. The air-water mixed cooling inverter according to claim 3 is characterized in that: The interior of the reactor area is treated with a device body anti-corrosion protection reinforcement.

5. The air-water mixed cooling inverter according to claim 1, characterized in that: The power cabinet is a fully enclosed thermal arrangement as a whole, and a fourth assembly used for internal circulation is arranged in the reactor area, and the fourth assembly includes a fourth heat exchanger and a fourth fan; The cold end input of the fourth heat exchanger is connected to the cold end output of the liquid cooling integrated module, and the cold end output of the fourth heat exchanger is connected to the cold end input of the liquid cooling integrated module; After the fourth fan starts working, a hot air flow is formed in the reactor area, and then a cold air flow is output after heat exchange with the cold-end water body through the fourth heat exchanger.

6. The air-water mixed cooling inverter according to claim 1, characterized in that: A third assembly for internal circulation is arranged in the grid-connected cabinet, and the third assembly includes a third heat exchanger and a third fan; The cold end input of the third heat exchanger is connected to the cold end output of the liquid cooling integrated module, and the cold end output of the third heat exchanger is connected to the cold end input of the liquid cooling integrated module; After the third fan starts working, a hot air flow is formed in the grid-connected cabinet, and then a cold air flow is output after heat exchange with the cold-end water body through the third heat exchanger.

7. The air-water mixed cooling inverter according to claim 6, characterized in that: The grid-connected cabinet is a fully enclosed thermal configuration as a whole, and is only connected to the liquid-cooled integrated module through a pipeline for heat exchange.

8. The air-water mixed cooling inverter according to claim 1, characterized in that: The control cabinet adopts a fully enclosed thermal setting, in which an air duct is arranged, and is only connected to the power module area for air cooling and heat dissipation.

9. The air-water mixed cooling inverter according to claim 1, characterized in that: The first combination is arranged at a corresponding position of the whole cabinet according to actual requirements of the application scenario.

10. The air-water mixed cooling inverter according to claim 1, characterized in that: The shell of the first assembly is provided with a device anti-corrosion protection design.

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