Air jet circulating cooling device for tower footing frequency converter of wind turbine generator

Abstract

The utility model discloses an air jet circulating cooling device for a tower footing frequency converter of a wind turbine generator, and belongs to the technical field of frequency converter cooling systems for wind turbine generators. Comprising an inner case arranged in a tower footing base; the outer case is arranged outside the tower footing base; wherein an air inlet pipe and an air outlet pipe are fixedly arranged on the outer wall of the inner case, the other end of the air inlet pipe and the other end of the air outlet pipe are connected with an air outlet and an air inlet of the frequency converter respectively, a finned evaporator and a fan are fixedly arranged on the inner side of the inner case, and the finned evaporator is used for cooling hot air entering the inner case. The fan is used for inputting air cooled by the fin type evaporator into the frequency converter, and a refrigerant heat dissipation assembly is arranged on the inner side of the outer machine box. The problem that in the prior art, due to the influence of environment temperatures in different seasons, the temperature of the tower footing frequency converter of the wind turbine generator is too high is solved.

Description

Technical Field

[0001] This application relates to the technical field of inverter cooling systems for wind turbine generators, and more specifically, to an air jet circulation cooling device for inverters on wind turbine tower bases. Background Technology

[0002] The tower-based frequency converter uses an axial flow fan to cool the inside of the frequency converter naturally. However, it is affected by the ambient temperature in different seasons. Especially in summer, when the ambient temperature is high, the heat dissipation of the frequency converter system is hindered, which greatly reduces the cooling effect. This can cause the frequency converter to overheat and shut down, and may even lead to a fire.

[0003] Therefore, how to effectively improve the cooling capacity of conventional air-cooling methods is an urgent problem that needs to be solved for wind turbine tower-based air-cooled frequency converters.

[0004] In view of this, we propose an air jet circulation cooling device for the frequency converter of wind turbine tower base. Utility Model Content

[0005] The purpose of this application is to provide an air jet circulation cooling device for wind turbine tower base inverters, which can effectively solve the problem of excessively high temperature of wind turbine tower base inverters due to the influence of ambient temperature in different seasons in the existing technology. It adopts forced air cooling technology of air jet circulation and, based on fluid dynamics simulation calculation and structural optimization, significantly increases the air cooling convection heat transfer effect of the inverter, ensuring the safe and stable operation of the wind turbine.

[0006] This application provides an air jet circulation cooling device for the frequency converter of a wind turbine tower base, including:

[0007] The internal chassis is located inside the tower base.

[0008] The external enclosure is located outside the tower base.

[0009] The inner casing has an air inlet pipe and an air outlet pipe fixedly installed on its outer wall. The other ends of the air inlet pipe and the air outlet pipe are connected to the air outlet and air inlet of the frequency converter, respectively. A finned evaporator and a fan are fixedly installed on the inner side of the inner casing. The finned evaporator is used to cool the hot air entering the inner casing, and the fan is used to input the cooled air from the finned evaporator into the frequency converter. Pipes are fixedly installed at both the liquid inlet and liquid outlet of the finned evaporator for transporting refrigerant. The other end of the pipes is fixed to the outer casing. A refrigerant heat dissipation assembly is installed on the inner side of the outer casing.

[0010] As an optional solution to the technical solution of this application, the refrigerant heat dissipation assembly includes a compressor. The liquid inlet of the compressor is connected to the liquid outlet of the finned evaporator through a pipeline. A finned condenser is provided on one side of the compressor, and a dryer filter is provided on one side of the finned condenser. A refrigeration solenoid valve and a throttling valve are provided at the liquid outlet of the dryer filter. A defrosting solenoid valve is provided at the liquid outlet of the compressor. The liquid outlet of the dryer filter and the liquid outlet of the compressor are connected to the liquid inlet of the finned evaporator through a pipeline.

[0011] As an optional solution to the technical solution in this application, the finned evaporator is located on the side near the inlet pipe, and the fan is located on the side near the outlet pipe.

[0012] As an optional solution to the technical solution in this application, the inverter has an outer panel that can be detachably installed on the side near the inner chassis, and a shunt assembly is provided on the inner side of the outer panel for shunting the cold air entering the inverter.

[0013] As an optional solution to the technical solution of this application, the flow divider includes an air inlet pipe, which is fixedly connected to the air inlet of the frequency converter. A flow divider plate is provided on the outside of the air inlet pipe, and a rotating component is provided on the outside of the flow divider plate.

[0014] As an optional solution to the technical solution of this application, the inner side of the flow divider is provided with a plurality of gas channels, and the corners of the gas channels are provided with arc angles.

[0015] As an optional solution to the technical solution of this application, the rotating assembly includes an electric push rod, which is fixedly disposed on the outer side of the outer plate. A toothed plate is fixedly disposed at the output end of the electric push rod. A row of gears is meshed on the outer side of the toothed plate. A rotating rod is fixedly disposed on the inner side of the gears. A gas guide plate is fixedly disposed on the outer side of the rotating rod corresponding to the gas channel.

[0016] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0017] (1) This application adopts forced air cooling technology with air jet circulation and is based on fluid dynamics simulation calculation and structural optimization to greatly increase the air cooling convection heat transfer effect of the frequency converter, ensure the safe and stable operation of the wind turbine, and solve the problem of excessive temperature of the wind turbine tower base frequency converter in the prior art due to the influence of ambient temperature in different seasons.

[0018] (2) By adding a shunt component inside the inverter, the cold air flows from the inlet to the key IGBT device, which has a better heat dissipation effect and disperses the cold air to the upper and lower components to form a circulation, which greatly increases the air-cooled convection heat transfer effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the air jet circulation cooling device for the wind turbine tower base inverter disclosed in a preferred embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the assembly of the inner casing and the shunt assembly in the air jet circulating cooling device for the wind turbine tower base inverter disclosed in a preferred embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the inner side of the inner casing of the wind turbine tower base inverter air jet circulation cooling device disclosed in a preferred embodiment of this application;

[0022] Figure 4 This is an exploded structural diagram of the outer plate and the shunt assembly in the air jet circulating cooling device for the wind turbine tower base inverter disclosed in a preferred embodiment of this application.

[0023] Figure 5 This is a cross-sectional schematic diagram of the flow distribution component in the air jet circulation cooling device for the wind turbine tower base inverter disclosed in a preferred embodiment of this application.

[0024] Figure 6 This is a schematic diagram of the working logic of the air jet circulation cooling device for the wind turbine tower base inverter disclosed in a preferred embodiment of this application.

[0025] Figure 7 This is a schematic diagram of the working principle of the air jet circulation cooling device for the wind turbine tower base inverter disclosed in a preferred embodiment of this application;

[0026] Figure 8 A temperature field analysis diagram of components inside the cabinet under conventional fan airflow;

[0027] Figure 9 This is a diagram showing the airflow field analysis inside a cabinet with a conventional fan-operated air supply.

[0028] Figure 10 Temperature field diagram of components inside the cabinet using an air jet cooling device;

[0029] Figure 11 This is a diagram of the airflow field inside the cabinet using an air jet cooling device.

[0030] Figure 12 This is a graph showing the results of the original cooling fan's cooling data analysis;

[0031] Figure 13 The figure shows the results of cooling data analysis for the installation of an air jet cooling device.

[0032] The following are the labeling instructions in the diagram: 100, Inner casing; 101, Inlet pipe; 102, Outlet pipe; 200, Outer casing; 300, Tower base; 400, Inverter; 401, Outer panel; 1, Compressor; 2, Finned condenser; 3, Dryer filter; 4, Throttling valve; 5, Finned evaporator; 51, Piping; 6, Fan; 7, Defrosting solenoid valve; 8, Refrigeration solenoid valve; 9, Flow divider assembly; 91, Inlet pipe; 92, Flow divider plate; 921, Gas passage; 9211, Arc angle; 93, Rotating assembly; 931, Electric push rod; 932, Toothed plate; 933, Gear; 934, Rotating rod; 935, Air guide plate. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the accompanying drawings.

[0034] Reference Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 This application discloses an air jet circulation cooling device for a wind turbine tower base inverter, including an inner casing 100 disposed inside a tower base 300, and an outer casing 200 disposed outside the tower base 300. An inlet pipe 101 and an outlet pipe 102 are fixedly disposed on the outer wall of the inner casing 100, with the other ends of the inlet pipe 101 and outlet pipe 102 connected to the air outlet and air inlet of the inverter 400, respectively. A finned evaporator 5 and a fan 6 are fixedly disposed inside the inner casing 100. The finned evaporator 5 is used to cool the hot air entering the inner casing 100, and the fan 6 is used to input the cooled air from the finned evaporator 5 into the inverter 400. Pipelines 51 are fixedly disposed at both the liquid inlet and liquid outlet ends of the finned evaporator 5. The refrigerant is transported by a pipe 51. The other end of the pipe 51 is fixed to the outdoor unit 200. The refrigerant heat dissipation assembly is provided inside the outdoor unit 200. The refrigerant heat dissipation assembly includes a compressor 1. The liquid inlet of the compressor 1 is connected to the liquid outlet of the finned evaporator 5 through the pipe 51. A finned condenser 2 is provided on one side of the compressor 1. A dryer filter 3 is provided on one side of the finned condenser 2. A refrigerant solenoid valve 8 and a throttling valve 4 are provided at the liquid outlet of the dryer filter 3. A defrosting solenoid valve 7 is provided at the liquid outlet of the compressor 1. The liquid outlet of the dryer filter 3 and the liquid outlet of the compressor 1 are connected to the liquid inlet of the finned evaporator 5 through the pipe 51. The finned evaporator 5 is located on the side near the inlet pipe 101. The fan 6 is located on the side near the outlet pipe 102.

[0035] When the cooling device cools down the inverter 400, the compressor 1 compresses the low-pressure gaseous refrigerant into a high-pressure gaseous state and sends it into the finned condenser 2. The finned condenser 2 is cooled and condensed into a high-pressure liquid state by the cooling fan. Then, it is depressurized into a low-pressure liquid state by the dryer filter 3 and the expansion valve 4 and enters the finned evaporator 5. The heat generated in the inverter 400 enters the inner side of the finned evaporator 5 through the air inlet pipe 101. The inner side of the finned evaporator 5 contains refrigerant. The finned evaporator 5 absorbs the heat from the hot air of the inverter 400 through the refrigerant, causing the refrigerant to vaporize into a low-pressure gaseous state and flow back to the compressor 1. After being compressed and cooled by the compressor 1, finned condenser 2, dryer filter 3, expansion valve 4, defrost solenoid valve 7 and refrigeration solenoid valve 8, the energy is finally transferred to the finned condenser 2. The finned condenser 2 has a cooling fan, which dissipates the heat into the atmosphere.

[0036] Meanwhile, the fan 6 is a circulating fan. The fan 6 sends the cold air (-18℃) cooled by the finned evaporator 5 to the working frequency converter 400 through the outlet pipe 102 for heat exchange, heat dissipation for the frequency converter 400, and air circulation. During defrosting, the defrosting solenoid valve 7 is opened, and the high-temperature gaseous refrigerant on the exhaust side of the compressor 1 enters the finned evaporator 5 through the pipe to defrost. After defrosting, the normal circulation is restored. The finned evaporator 5 and the fan 6 are respectively located close to the inlet pipe 101 and the outlet pipe 102 to ensure that the finned evaporator 5 can fully exchange heat with the hot air.

[0037] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 An outer panel 401 is detachably installed on the side of the inverter 400 near the inner casing 100. A flow divider assembly 9 is installed on the inner side of the outer panel 401 to divide the cold air entering the inverter 400. The flow divider assembly 9 includes an air inlet pipe 91, which is fixedly installed to the air inlet of the inverter 400. A flow divider plate 92 is installed on the outer side of the air inlet pipe 91, and a rotating assembly 93 is installed on the outer side of the flow divider plate 92. Several gas channels are opened on the inner side of the flow divider plate 92. 921, an arc angle 9211 is provided at the corner of the gas passage 921. The rotating component 93 includes an electric push rod 931, which is fixedly installed on the outer side of the outer plate 401. A toothed plate 932 is fixedly installed at the output end of the electric push rod 931. A row of gears 933 is meshed on the outer side of the toothed plate 932. A rotating rod 934 is fixedly installed on the inner side of the gears 933. A guide plate 935 is fixedly installed on the outer side of the rotating rod 934 corresponding to the gas passage 921.

[0038] When the fan 6 sends cold air into the inside of the inverter 400, the cold air enters the inside of the gas channel 921 through the air inlet of the inverter 400. The cold air is then diverted through multiple gas channels 921 and released from several gas channels 921, achieving the effect of diversion and heat dissipation.

[0039] The electric push rod 931 pushes the toothed plate 932 to move, which drives the gear 933 to rotate, thereby driving the rotating rod 934 to rotate. This allows the air guide plate 935 to change the flow direction of the cold air, so that the cold air can flow to the key IGBT device. The arc angle 9211 can make the gas flow smoother and gradually change direction along the arc, reducing various resistance losses.

[0040] Reference Figure 8 , Figure 9 , Figure 10 and Figure 11 Based on the above embodiments, this embodiment simulates and analyzes the temperature field and airflow field of the inverter 400 under the conditions of ordinary fan cooling and the improved air jet cooling of this solution. The analysis shows that due to the low air supply power of the conventional fan and the adsorption and blockage of impurities and dust on the heat sink, its cooling capacity is reduced. Under the working conditions, the highest temperature of the components can rise to about 380K (107℃). Under this cooling condition, the airflow in the cabinet is relatively dispersed and appears chaotic in many places, resulting in poor heat dissipation.

[0041] Under the cooling scheme of this project, the highest temperature of the components with the largest heat generation in the inverter 400 is only 319K (46℃), which shows that the cooling system has a very good cooling effect on the components in the cabinet and can ensure the safe and stable operation of the inverter 400. In addition, due to the addition of the shunt component 9, the cold air flows from the inlet to the key IGBT devices, which has a good heat dissipation effect. Furthermore, the cold air is dispersed to the upper and lower component parts to form a circulation, which greatly increases the air-cooled convection heat transfer effect.

[0042] Reference Figure 12 and Figure 13 Based on the above embodiments, this embodiment analyzes the temperature and useful power of inverter 400 before and after the installation of the air jet cooling device. Before installation, during the power increase process, although the temperature did not reach the alarm value, the temperature curve changed significantly, with a large difference between the peak and valley values. After the air jet cooling device was installed, the temperature curve changed less, and the temperature value was controlled below 30°C, basically in a constant temperature state. This indicates that the cooling device has successfully solved the problem of excessive temperature of inverter 400, thereby ensuring the normal operation of the unit and improving economic efficiency.

[0043] In summary, the air jet circulation cooling device for the wind turbine tower base inverter disclosed in this application, during use, involves the compressor 1 compressing the low-pressure gaseous refrigerant into a high-pressure gaseous state, which is then sent to the finned condenser 2. The finned condenser 2 is cooled and condensed into a high-pressure liquid state by the cooling fan, and then further depressurized into a low-pressure liquid state by the dryer filter 3 and the throttle valve 4 before entering the finned evaporator 5. The heat generated in the inverter 400 enters the inner side of the finned evaporator 5 through the inlet pipe 101. The inner side of the evaporator 5 contains refrigerant. The finned evaporator 5 absorbs the heat from the hot air of the inverter 400 through the refrigerant, causing the refrigerant to vaporize into a low-pressure gaseous state and flow back to the compressor 1. After being compressed and cooled by the compressor 1, finned condenser 2, dryer filter 3, throttle valve 4, defrost solenoid valve 7, and refrigeration solenoid valve 8, the energy is finally transferred to the finned condenser 2. The finned condenser 2 has a heat dissipation fan, which transfers the heat to the atmosphere through heat dissipation, thus realizing the law of conservation of energy.

[0044] Meanwhile, fan 6 is a circulating fan. The fan 6 draws cool air (-18℃) cooled by the finned evaporator 5 and sends it through the outlet pipe 102 into the operating frequency converter 400. As the fan 6 delivers the cool air into the frequency converter 400, it enters the gas channel 921 through the air inlet of the frequency converter 400. The cool air is then distributed through multiple gas channels 921, achieving a cooling effect. The electric push rod 931 moves the gear plate 932, driving the gear 93... 3. Rotation drives the rotating rod 934 to rotate, allowing the air guide plate 935 to change the direction of cold air flow, enabling the cold air to flow towards the key IGBT devices for heat exchange, heat dissipation for the inverter 400, and air circulation. During defrosting, the defrosting solenoid valve 7 opens, and the high-temperature gaseous refrigerant on the exhaust side of the compressor 1 enters the finned evaporator 5 through the pipe to defrost. After defrosting, the normal circulation is restored. The finned evaporator 5 and the fan 6 are respectively located close to the inlet pipe 101 and the outlet pipe 102, which can ensure that the finned evaporator 5 can fully exchange heat with the hot air.

Claims

1. An air jet circulating cooling device for the frequency converter of a wind turbine tower base, characterized in that, Include: The inner casing (100) is located inside the tower base (300); The external enclosure (200) is located outside the tower base (300); The inner casing (100) is fixedly provided with an air inlet pipe (101) and an air outlet pipe (102) on its outer wall. The other ends of the air inlet pipe (101) and the air outlet pipe (102) are respectively connected to the air outlet and air inlet of the frequency converter (400). A finned evaporator (5) and a fan (6) are fixedly installed on the inner side of the inner casing (100). The finned evaporator (5) is used to cool the hot air entering the inner casing (100), and the fan (6) is used to input the air cooled by the finned evaporator (5) into the inverter (400). The finned evaporator (5) has pipes (51) fixedly installed at both the liquid inlet and liquid outlet for transporting refrigerant. The other end of the pipes (51) is fixed to the outer casing (200), and a refrigerant heat dissipation assembly is installed on the inner side of the outer casing (200).

2. The air jet circulation cooling device for the wind turbine tower base inverter according to claim 1, characterized in that, The refrigerant heat dissipation assembly includes a compressor (1), and the liquid inlet of the compressor (1) is connected to the liquid outlet of the finned evaporator (5) through a pipeline (51). A finned condenser (2) is provided on one side of the compressor (1), and a dryer filter (3) is provided on one side of the finned condenser (2). A refrigeration solenoid valve (8) and a throttle valve (4) are provided at the liquid outlet end of the dryer filter (3). The compressor (1) is equipped with a defrosting solenoid valve (7) at the liquid outlet end. The liquid outlet end of the dryer filter (3) and the liquid outlet end of the compressor (1) are connected to the liquid inlet end of the finned evaporator (5) through a pipeline (51).

3. The air jet circulation cooling device for the wind turbine tower base inverter according to claim 1, characterized in that, The finned evaporator (5) is located on the side near the inlet pipe (101), and the fan (6) is located on the side near the outlet pipe (102).

4. The air jet circulation cooling device for the wind turbine tower base inverter according to claim 1, characterized in that: The inverter (400) has a detachable outer panel (401) on the side near the inner casing (100). A shunt assembly (9) is provided on the inner side of the outer panel (401) to shunt the cold air entering the inverter (400).

5. The air jet circulation cooling device for the wind turbine tower base inverter according to claim 4, characterized in that, The diversion assembly (9) includes an air inlet pipe (91), which is fixedly connected to the air inlet of the frequency converter (400). A diversion plate (92) is provided on the outside of the air inlet pipe (91), and a rotating assembly (93) is provided on the outside of the diversion plate (92).

6. The air jet circulation cooling device for the wind turbine tower base inverter according to claim 5, characterized in that, The inner side of the diverter plate (92) is provided with a plurality of gas channels (921), and the corners of the gas channels (921) are provided with arc corners (9211).

7. The air jet circulation cooling device for the wind turbine tower base inverter according to claim 5, characterized in that, The rotating assembly (93) includes an electric push rod (931), which is fixedly disposed on the outer side of the outer plate (401). A toothed plate (932) is fixedly disposed at the output end of the electric push rod (931). A row of gears (933) is meshed on the outer side of the toothed plate (932). A rotating rod (934) is fixedly disposed on the inner side of the gears (933). A gas guide plate (935) is fixedly disposed on the outer side of the rotating rod (934) corresponding to the gas channel (921).

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