A cooling system

Abstract

The embodiment of the present application discloses a cooling system, which comprises at least two heat dissipation devices, a first power assembly for providing air volume and a first container containing cooling liquid; the first power assembly is arranged between a first heat dissipation device and a second heat dissipation device of the at least two heat dissipation devices; one end of the first heat dissipation device is connected with one end of a converter in the train through a first pipeline, and the other end of the first heat dissipation device is connected with the other end of the converter, thereby forming a first loop; the temperature of the converter is reduced; one end of the second heat dissipation device is connected with one end of a first motor and a second motor connected in parallel in at least two motors in the train through a second pipeline, and the other end of the second heat dissipation device is connected with the other end of the first motor and the second motor connected in parallel, thereby forming a second loop; the temperature of the first motor and the second motor connected in parallel in the at least two motors is reduced.

Description

Technical Field

[0001] This invention relates to the field of cooling technology, and more particularly to a cooling system. Background Technology

[0002] In related technologies, to maintain the normal operation of the converter and traction motor, a certain cooling method is needed to help dissipate heat from the converter power devices and the traction motor. However, current cooling methods use water circulation cooling for the traction converter and forced air cooling for the auxiliary converter, requiring three sets of fan units to dissipate heat from the traction converter, auxiliary converter, and traction motor respectively. This results in a large space occupation, high losses, and high cost for the entire traction electric drive system. Water circulation cooling for the traction auxiliary converter (main and auxiliary integrated) and water circulation cooling for the traction motor require two independent water cooling systems. The two water cooling systems are incompatible, and each component is a customized part, resulting in poor interchangeability, high cost, and a large number of spare parts required. Currently, there is no effective solution for simplifying the design of the traction cooling system. Summary of the Invention

[0003] To address the existing technical problems, embodiments of the present invention provide a cooling system.

[0004] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0005] This invention provides a cooling system applied to a train; the system includes: at least two heat dissipation devices, a first power component providing airflow, and a first container containing coolant; the first container is disposed inside the heat dissipation devices; the first power component is disposed between the first and second heat dissipation devices in the at least two heat dissipation devices.

[0006] One end of the first heat dissipation device is connected to one end of the converter in the train through a first pipe, and the other end of the first heat dissipation device is connected to the other end of the converter, forming a first circuit; the coolant in the first container flows into the converter through the first pipe, thereby reducing the temperature of the converter.

[0007] One end of the second heat dissipation device is connected to one end of the first motor and the second motor that are connected in parallel among the at least two motors in the train through a second pipe, and the other end of the second heat dissipation device is connected to the other end of the first motor and the second motor that are connected in parallel, forming a second circuit; the coolant in the first container flows into the at least two motors through the second pipe, thereby reducing the temperature of the first motor and the second motor that are connected in parallel among the at least two motors.

[0008] In the above scheme, the system further includes a measuring device and a control device; the measuring device is connected to the converter, the motor and the control device respectively;

[0009] The measuring device is used to measure the first temperature of the converter and the second temperature of the motor;

[0010] The control device is configured to determine the absolute value of the difference between the first temperature and the second temperature; if the absolute value of the difference is greater than or equal to a preset threshold, control the first heat dissipation device and the second heat dissipation device to be connected in series; if the absolute value of the difference is less than the preset threshold, control the first heat dissipation device and the second heat dissipation device to be connected in parallel.

[0011] In the above scheme, the first heat dissipation device and the second heat dissipation device are connected in series. A second power component is also provided on the first pipeline near the first heat dissipation device and a first pressure sensor is provided near the converter. A first temperature sensor is provided between the second power component and the first pressure sensor. The control device also includes a first control unit. The first control unit is connected to the first temperature sensor and the first pressure sensor respectively.

[0012] The second power component is used to control the circulation of coolant in the first container in the first circuit;

[0013] The first temperature sensor is used to detect the first temperature of the coolant in the first circuit and send the first temperature to the first control unit;

[0014] The first control unit is configured to control the system, the converter, and the at least two motors to operate when the first temperature is less than or equal to a first preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the first temperature is greater than the first preset threshold.

[0015] The first pressure sensor is used to detect the first pressure of the coolant in the first circuit and send the first pressure to the first control unit;

[0016] The first control unit is configured to control the system, the converter, and the at least two motors to operate when the first pressure is less than or equal to a second preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the first pressure is greater than the second preset threshold.

[0017] In the above scheme, a third power component is provided on the second pipeline near the second heat dissipation device, and a second temperature sensor is provided near the first motor and the second motor connected in parallel; a second pressure sensor is provided between the third power component and the second temperature sensor;

[0018] The third power component is used to control the coolant in the first container to circulate in the second circuit;

[0019] The second temperature sensor is used to detect the second temperature of the coolant in the second circuit and send the second temperature to the first control unit;

[0020] The first control unit is configured to control the first and second motors connected in parallel to operate when the second temperature is less than or equal to a third preset threshold; and to control the first and second motors connected in parallel to stop operating when the second temperature is greater than the third preset threshold.

[0021] The second pressure sensor is used to detect the second pressure of the coolant in the second circuit and send the second pressure to the first control unit;

[0022] The first control unit is configured to control the first and second motors connected in parallel to operate when the second pressure is less than or equal to a fourth preset threshold; and to control the first and second motors connected in parallel to stop operating when the second pressure is greater than the fourth preset threshold.

[0023] In the above scheme, the second heat dissipation device is connected to the converter through a third pipeline to form a third loop; a fourth power component is provided near the second heat dissipation device and a third pressure sensor is provided near the converter on the third pipeline; a third temperature sensor is provided between the fourth power component and the third pressure sensor;

[0024] The fourth power component is used to control the circulation of coolant in the first container in the third circuit;

[0025] The third temperature sensor is used to detect the third temperature of the coolant in the third circuit and send the third temperature to the first control unit;

[0026] The first control unit is configured to control the system, the converter, and the at least two motors to operate when the third temperature is less than or equal to the fifth preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the third temperature is greater than the fifth preset threshold.

[0027] The third pressure sensor is used to detect the third pressure of the coolant in the third circuit and send the third pressure to the first control unit;

[0028] The first control unit is configured to control the system, the converter, and the at least two motors to operate when the third pressure is less than or equal to the sixth preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the third pressure is greater than the sixth preset threshold.

[0029] In the above scheme, the first heat dissipation device is connected to the third motor and the fourth motor connected in parallel among the at least two motors through the fourth pipe to form a fourth circuit; a fifth power component is provided near the first heat dissipation device and a fourth temperature sensor is provided near the third motor and the fourth motor connected in parallel among the at least two motors; a fourth pressure sensor is provided between the fifth power component and the fourth temperature sensor;

[0030] The fifth power component is used to control the circulation of coolant in the first container in the fourth circuit;

[0031] The fourth temperature sensor is used to detect the fourth temperature of the coolant in the fourth circuit and send the fourth temperature to the first control unit;

[0032] The first control unit is configured to control the parallel-connected third and fourth motors to operate when the fourth temperature is less than or equal to the seventh preset threshold; and to control the parallel-connected third and fourth motors to stop operating when the fourth temperature is greater than the seventh preset threshold.

[0033] The fourth pressure sensor is used to detect the fourth pressure of the coolant in the fourth circuit and send the fourth pressure to the first control unit;

[0034] The first control unit is configured to control the parallel-connected third and fourth motors to operate when the fourth pressure is less than or equal to the eighth preset threshold; and to control the parallel-connected third and fourth motors to stop operating when the fourth pressure is greater than the eighth preset threshold.

[0035] In the above scheme, the first heat dissipation device and the second heat dissipation device are connected in series; a sixth power component is provided on the first pipeline near the first heat dissipation device and a fifth pressure sensor is provided near the converter; a fifth temperature sensor is provided between the sixth power component and the fifth pressure sensor; the control device also includes a second control unit; the second control unit is connected to the fifth temperature sensor and the fifth pressure sensor respectively; the first circuit also includes the second heat dissipation device; the second heat dissipation device is provided between the converter and the first heat dissipation device;

[0036] The sixth power component is used to control the circulation of coolant in the first container in the first circuit.

[0037] The fifth temperature sensor is used to detect the fifth temperature of the coolant in the first circuit and send the fifth temperature to the second control unit;

[0038] The second control unit is configured to control the system, the converter, and the at least two motors to operate when the fifth temperature is less than or equal to the ninth preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the fifth temperature is greater than the ninth preset threshold.

[0039] The fifth pressure sensor is used to detect the fifth pressure of the coolant in the first circuit and send the fifth pressure to the second control unit;

[0040] The second control unit is configured to control the system, the converter, and the at least two motors to operate when the fifth pressure is less than or equal to the tenth preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the fifth pressure is greater than the tenth preset threshold.

[0041] In the above scheme, a seventh power component is provided on the second pipeline near the first heat dissipation device, and a sixth temperature sensor is provided near the fifth and sixth motors connected in parallel among the at least two motors; a sixth pressure sensor is provided between the seventh power component and the sixth temperature sensor; the second heat dissipation device is connected to the first heat dissipation device through the second pipeline; the first motor and the second motor connected in parallel are connected in parallel with the fifth motor and the sixth motor connected in parallel.

[0042] The seventh power component is used to control the circulation of coolant in the first container in the second circuit;

[0043] The sixth temperature sensor is used to detect the sixth temperature of the coolant in the second circuit and send the sixth temperature to the second control unit;

[0044] The second control unit is used to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to work when the sixth temperature is less than or equal to the eleventh preset threshold; and to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to stop working when the sixth temperature is greater than the eleventh preset threshold.

[0045] The sixth pressure sensor is used to detect the sixth pressure of the coolant in the second circuit and send the sixth pressure to the second control unit;

[0046] The second control unit is used to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to work when the sixth pressure is less than or equal to the twelfth preset threshold; and to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to stop working when the sixth pressure is greater than the twelfth preset threshold.

[0047] In the above scheme, the control of the first heat dissipation device and the second heat dissipation device is connected in parallel. An eighth power component is provided on the first pipeline near the first heat dissipation device and a seventh pressure sensor is provided near the converter. A seventh temperature sensor is provided between the eighth power component and the seventh pressure sensor. The control device also includes a third control unit. The third control unit is connected to the seventh temperature sensor and the seventh pressure sensor respectively.

[0048] The eighth power component is used to control the circulation of coolant in the first container in the first circuit.

[0049] The seventh temperature sensor is used to detect the seventh temperature of the coolant in the first circuit and send the seventh temperature to the third control unit;

[0050] The third control unit is used to control the system, the converter, and the at least two motors to operate when the seventh temperature is less than or equal to the thirteenth preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the seventh temperature is greater than the thirteenth preset threshold.

[0051] The seventh pressure sensor is used to detect the seventh pressure of the coolant in the first circuit and send the seventh pressure to the third control unit;

[0052] The third control unit is used to control the system, the converter, and the at least two motors to operate when the seventh pressure is less than or equal to the fourteenth preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the seventh pressure is greater than the fourteenth preset threshold.

[0053] In the above scheme, a ninth power assembly is provided on the second pipeline near the seventh and eighth motors connected in parallel among the at least two motors, and an eighth pressure sensor is provided near the second heat dissipation device; an eighth temperature sensor is provided between the ninth power assembly and the eighth pressure sensor; the first motor and the second motor connected in parallel are connected in parallel with the seventh motor and the eighth motor connected in parallel.

[0054] The ninth power component is used to control the circulation of coolant in the first container in the second circuit;

[0055] The eighth temperature sensor is used to detect the eighth temperature of the coolant in the second circuit and send the eighth temperature to the third control unit;

[0056] The third control unit is used to control the parallel-connected first and second motors, and the parallel-connected seventh and eighth motors to work when the eighth temperature is less than or equal to the fifteenth preset threshold; and to control the parallel-connected first and second motors, and the parallel-connected seventh and eighth motors to stop working when the eighth temperature is greater than the fifteenth preset threshold.

[0057] The eighth pressure sensor is used to detect the eighth pressure of the coolant in the second circuit and send the eighth pressure to the third control unit;

[0058] The third control unit is used to control the parallel-connected first and second motors, and the parallel-connected seventh and eighth motors to work when the eighth pressure is less than or equal to the sixteenth preset threshold; and to control the parallel-connected first and second motors, and the parallel-connected seventh and eighth motors to stop working when the eighth pressure is greater than the sixteenth preset threshold.

[0059] In the above scheme, the system further includes a first switch, a second switch, a third switch, and a fourth switch; the first switch is disposed between the first heat dissipation device and the eighth power component; the second switch is disposed between the first heat dissipation device and the second heat dissipation device; the third switch is disposed between the second heat dissipation device and the at least two motors; and the fourth switch is disposed between the at least two motors and the eighth power component.

[0060] When the first switch and the third switch are open, and the second switch and the fourth switch are closed, the coolant in the first container circulates in the first circuit through the first switch;

[0061] When the first switch and the third switch are closed, and the second switch and the fourth switch are open, the first pipeline further includes the second switch, the second heat dissipation device, the ninth power component, the eighth temperature sensor, the eighth pressure sensor, the first motor, the second motor, the seventh motor, the eighth motor, and the fourth switch; the second pipeline further includes the fourth switch, the eighth power component, the seventh temperature sensor, the seventh pressure sensor, the converter, the first heat dissipation device, and the second switch.

[0062] This invention provides a cooling system applied to a train. The system includes at least two heat dissipation devices, a first power component providing airflow, and a first container holding coolant. The first container is disposed inside the heat dissipation devices. The first power component is disposed between the first and second heat dissipation devices. One end of the first heat dissipation device is connected to one end of a converter in the train via a first pipe, and the other end of the first heat dissipation device is connected to the other end of the converter, forming a first loop. The coolant in the first container flows into the converter through the first pipe, reducing the temperature of the converter. One end of the second heat dissipation device is connected to one end of a first motor and a second motor connected in parallel in the train via a second pipe, and the other end of the second heat dissipation device is connected to the other end of the first and second motors connected in parallel, forming a second loop. The coolant in the first container flows into the at least two motors through the second pipe, reducing the temperature of the first and second motors connected in parallel. In the technical solution of this invention, one end of the first heat dissipation device is connected to one end of the converter in the train through a first pipe, and the other end of the first heat dissipation device is connected to the other end of the converter, forming a first circuit; the coolant in the first container flows into the converter through the first pipe, thereby reducing the temperature of the converter; one end of the second heat dissipation device is connected to one end of the first motor and the second motor connected in parallel among at least two motors in the train through a second pipe, and the other end of the second heat dissipation device is connected to the other end of the first motor and the second motor connected in parallel, forming a second circuit; the coolant in the first container flows into the at least two motors through the second pipe, thereby reducing the temperature of the first motor and the second motor connected in parallel among the at least two motors, thus simplifying the design while ensuring the performance of the cooling system. Attached Figure Description

[0063] Figure 1 This is a schematic diagram of the composition structure of a cooling system provided in an embodiment of the present invention;

[0064] Figure 2 This is a schematic diagram of the composition structure of a cooling system with series airflow provided in an embodiment of the present invention;

[0065] Figure 3 A schematic diagram of the composition structure of another cooling system with airflow series connection provided in an embodiment of the present invention;

[0066] Figure 4 A schematic diagram of the composition structure of a cooling system with parallel airflow provided in an embodiment of the present invention;

[0067] Figure 5 A schematic diagram of the composition structure of a cooling system with parallel airflow and parallel waterflow provided in an embodiment of the present invention;

[0068] Figure 6 A schematic diagram of the physical structure of a cooling system with parallel airflow and parallel waterflow provided in an embodiment of the present invention;

[0069] Figure 7 This is a schematic diagram of the composition structure of a cooling system with parallel airflow and series waterflow provided in an embodiment of the present invention. Detailed Implementation

[0070] In related technologies, the converter is a crucial component of the electric drive system for rail transit vehicles, providing power to the traction motors. The traction motor converts electrical energy into mechanical energy, utilizing energized coils (stator windings) to generate a rotating magnetic field that acts on the rotor, creating magnetoelectric torque to provide traction for the vehicle. The converter's rectification and inversion functions are achieved through power devices. The frequent switching on and off of these power devices generates significant energy loss, leading to increased junction temperatures in the power modules. To maintain the normal operation of the converter and traction motor, appropriate cooling methods are necessary to dissipate heat from the power devices and traction motor.

[0071] Currently, the main cooling methods for converters and traction motors include natural cooling, forced air cooling, and water circulation cooling.

[0072] (1) For the cooling device of the converter, the main and auxiliary integrated converter usually adopts the full water circulation cooling method, while the main and auxiliary separated traction converter adopts water circulation cooling and the auxiliary converter adopts forced air cooling. The power devices are mounted on the water-cooled base plate, and the water-cooled base plate is connected to the heat exchange device through certain pipelines. The pressure of the water pump is used to circulate the coolant that has absorbed heat. The purpose of heat exchange is achieved by cooling the heat exchange device, reducing the temperature of the coolant, and allowing the cooled coolant to flow through the water-cooled base plate again. This circulation system constitutes the converter water circulation cooling system.

[0073] (2) The working principle of the motor is that the magnetic field exerts a force on the current, causing the motor to rotate. When the motor converts energy, a small part of it is always lost and converted into heat. It is necessary to continuously dissipate the heat through the motor casing and the surrounding medium. The cooling device for the traction motor is divided into forced air cooling and water circulation cooling. The cooling device is a device that transfers the heat of one cooling medium to another cooling medium and keeps the two cooling media separate.

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the specific technical solutions of the invention will be further described in detail below with reference to the accompanying drawings of the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0075] This invention provides a cooling system. Figure 1 This is a schematic diagram of the composition and structure of a cooling system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the system 10 is applied to a train; the system 10 includes: at least two heat dissipation devices, a first power assembly 101 that provides airflow, and a first container 102 containing coolant; the first container 102 is disposed inside the heat dissipation devices; the first power assembly 101 is disposed between the first heat dissipation device 103 and the second heat dissipation device 104 of the at least two heat dissipation devices.

[0076] The first heat dissipation device 103 is connected to one end of the converter 105 in the train through the first pipe 11, and the other end of the first heat dissipation device 103 is connected to the other end of the converter 105 to form a first circuit; the coolant in the first container 102 flows into the converter 105 through the first pipe 11 to reduce the temperature of the converter 105.

[0077] One end of the second heat dissipation device 104 is connected to one end of the first motor 106 and the second motor 107, which are connected in parallel among the at least two motors in the train, through the second pipe 12. The other end of the second heat dissipation device 104 is connected to the other end of the first motor 106 and the second motor 107, which are connected in parallel, to form a second circuit. The coolant in the first container 102 flows into the at least two motors through the second pipe 12, thereby reducing the temperature of the first motor and the second motor, which are connected in parallel among the at least two motors.

[0078] In this embodiment, the heat dissipation device can be a composite heat dissipation device or a single-layer heat dissipation device. As an example, the heat dissipation device can be a double-layer composite heat dissipation device that combines a converter heat dissipation device and a motor heat dissipation device; the heat dissipation device can also be a standardized heat dissipation device that meets the heat dissipation requirements.

[0079] The first power assembly 101 is used to provide airflow; as an example, the first power assembly 101 can be a biaxial blower. The first container 102 is provided with a heat dissipation device inside for containing coolant; it should be noted that coolant can be injected into the heat dissipation device.

[0080] It should be noted that the first power assembly 101 (dual-axis fan) is used to provide air to the first heat dissipation device 103 and the second heat dissipation device 104, thereby reducing the temperature of the coolant inside the first heat dissipation device 103 and the second heat dissipation device 104.

[0081] In an optional embodiment of the present invention, the system 10 further includes a measuring device and a control device; the measuring device is connected to the converter, the motor and the control device respectively; the measuring device is used to measure a first temperature of the converter 105 and a second temperature of the motor; the control device is used to determine the absolute value of the difference between the first temperature and the second temperature; if the absolute value of the difference is greater than or equal to a preset threshold, the first heat dissipation device 103 and the second heat dissipation device 104 are connected in series; if the absolute value of the difference is less than the preset threshold, the first heat dissipation device 103 and the second heat dissipation device 104 are connected in parallel.

[0082] In this embodiment, the preset threshold can be set according to actual conditions, and is not limited here. The measuring device is in Figure 1Not shown in the diagram, but as an example, the measuring device can be a temperature sensor; measuring the first temperature of the converter 105 and the second temperature of the motor; determining the absolute value of the difference between the first temperature and the second temperature; if the absolute value of the difference is greater than or equal to a preset threshold, connecting the first heat dissipation device 103 and the second heat dissipation device 104 in series; if the absolute value of the difference is less than the preset threshold, connecting the first heat dissipation device 103 and the second heat dissipation device 104 in parallel can be understood as measuring the temperature of the converter 105 and the motor, and determining the connection relationship between the first heat dissipation device 103 and the second heat dissipation device 104 based on the temperature difference between the two.

[0083] It should be noted that the series connection between the first heat dissipation device 103 and the second heat dissipation device 104 can be understood as a series airflow path; the parallel connection between the first heat dissipation device 103 and the second heat dissipation device 104 can be understood as a parallel airflow path.

[0084] To facilitate understanding, an example is provided here: when the temperature difference between the heat-generating components of the converter and the motor is large, the airflow is connected in series; when the temperature difference between the heat-generating components of the converter and the motor is close, the airflow is connected in parallel to ensure the heat dissipation performance of the converter and the motor radiator.

[0085] In an optional embodiment of the present invention, when the first heat dissipation device 103 and the second heat dissipation device 104 are connected in series, Figure 2 This is a schematic diagram of the composition of a cooling system with series airflow provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the following will be combined with Figure 2 To illustrate, the first pipeline 11 is also provided with a second power assembly 201 near the first heat dissipation device 103 and a first pressure sensor 203 near the converter 105; a first temperature sensor 202 is provided between the second power assembly 201 and the first pressure sensor 203; the control device also includes a first control unit 204; the first control unit 204 is connected to the first temperature sensor 202 and the first pressure sensor 203 respectively;

[0086] The second power assembly 201 is used to control the circulation of coolant in the first container 102 in the first circuit;

[0087] The first temperature sensor 202 is used to detect the first temperature of the coolant in the first circuit and send the first temperature to the first control unit 204;

[0088] The first control unit 204 is configured to control the system 10, the inverter 105, and the at least two motors to operate when the first temperature is less than or equal to a first preset threshold; and to control the system 10, the inverter 105, and the at least two motors to stop operating when the first temperature is greater than the first preset threshold.

[0089] The first pressure sensor 203 is used to detect the first pressure of the coolant in the first circuit and send the first pressure to the first control unit 204;

[0090] The first control unit 204 is used to control the system 10, the inverter 105 and the at least two motors to work when the first pressure is less than or equal to the second preset threshold; and to control the system 10, the inverter 105 and the at least two motors to stop working when the first pressure is greater than the second preset threshold.

[0091] In this embodiment, the second power component 201 is used to control the circulation of coolant in the first container 102 in the first circuit. As an example, the second power component 201 can be a water pump 1. The first temperature sensor 202 can be a temperature sensor 1; the first pressure sensor 203 can be a pressure sensor 1.

[0092] It should be noted that, Figure 2 The first control unit 204 is not shown in the figure. The first control unit 204 is located inside the system 10. The connection relationship between the first control unit 204 and the first temperature sensor 202 and the first pressure sensor 203 is not limited here. As an example, the first control unit 204 can be wirelessly connected to the first temperature sensor 202 and the first pressure sensor 203 respectively.

[0093] The first preset threshold and the second preset threshold can be determined according to the actual situation, and are not limited here.

[0094] It should be noted that the first temperature sensor 202 and the first pressure sensor 203 transmit the measured data to the first control unit 204 in real time. When the first temperature detected by the first temperature sensor 202 exceeds the first preset threshold and / or the first pressure detected by the first pressure sensor 203 exceeds the second preset threshold, the first control unit 204 receives the information and can stop the entire system 10, the inverter 105 and the motor from working.

[0095] It should be noted that, in this embodiment, the first heat dissipation device 103 can be a double-layer composite heat sink 1, with the outer layer being a heat sink for the converter and the inner layer being a heat sink for the traction motor; the second heat dissipation device 104 can be a double-layer composite heat sink 2, with the outer layer being a heat sink for the converter and the inner layer being a heat sink for the traction motor. Heat sinks 1 and 2 are respectively located on both sides of the converter cabinet's routing direction.

[0096] For ease of understanding, an example is given here: the coolant in radiator 1 flows into the converter through water pump 1, temperature sensor 1 and pressure sensor 1. The heat-generating components in the converter work, causing the temperature of the coolant to rise. Finally, the coolant returns to radiator 1 for heat dissipation. A dual-shaft fan is used to dissipate heat from radiator 1.

[0097] In an optional embodiment of the present invention, a third power assembly 205 is provided on the second pipeline 12 near the second heat dissipation device 104 and a second temperature sensor 206 is provided near the first motor 106 and the second motor 107 connected in parallel; a second pressure sensor 207 is provided between the third power assembly 205 and the second temperature sensor 206.

[0098] The third power component 205 is used to control the coolant in the first container 102 to circulate in the second circuit;

[0099] The second temperature sensor 206 is used to detect the second temperature of the coolant in the second circuit and send the second temperature to the first control unit 204;

[0100] The first control unit 204 is used to control the parallel-connected first motor 106 and second motor 107 to work when the second temperature is less than or equal to the third preset threshold; and to control the parallel-connected first motor 106 and second motor 107 to stop working when the second temperature is greater than the third preset threshold.

[0101] The second pressure sensor 207 is used to detect the second pressure of the coolant in the second circuit and send the second pressure to the first control unit 204;

[0102] The first control unit 204 is used to control the first motor 106 and the second motor 107 connected in parallel to work when the second pressure is less than or equal to the fourth preset threshold; and to control the first motor 106 and the second motor 107 connected in parallel to stop working when the second pressure is greater than the fourth preset threshold.

[0103] It should be noted that the control unit 204 is connected to the second temperature sensor 206 and the second pressure sensor 207 respectively. The connection relationship is not limited here. As an example, the control unit 204 can be wirelessly connected to the second temperature sensor 206 and the second pressure sensor 207 respectively.

[0104] In this embodiment, the third power component 205 is used to control the circulation of coolant in the first container 102 in the second circuit. As an example, the third power component 205 can be a water pump 4. The second temperature sensor 206 can be a temperature sensor 4; the second pressure sensor 207 can be a pressure sensor 4.

[0105] The third and fourth preset thresholds can be set according to actual conditions, and are not limited here.

[0106] It should be noted that the second temperature sensor 206 and the second pressure sensor 207 transmit the measured data to the first control unit 204 in real time. When the second temperature detected by the second temperature sensor 206 exceeds the third preset threshold and / or the second pressure detected by the second pressure sensor 207 exceeds the fourth preset threshold, the first control unit 204 receives the information and causes the first motor 105 and the second motor 106 to stop working.

[0107] For ease of understanding, an example is given here: the coolant in radiator 2 flows into the motor through water pump 4, pressure sensor 4, and temperature sensor 4. The heat-generating components of the motor work, causing the temperature of the coolant to rise. Finally, the coolant returns to radiator 2 for heat dissipation. A dual-shaft fan is used to dissipate heat from radiator 2.

[0108] In an optional embodiment of the present invention, the second heat dissipation device 104 is connected to the converter 105 through a third pipe 13 to form a third circuit; a fourth power assembly 208 is disposed on the third pipe 13 near the second heat dissipation device 104 and a third pressure sensor 210 is disposed near the converter 105; a third temperature sensor 209 is disposed between the fourth power assembly 208 and the pressure sensor 210.

[0109] The fourth power assembly 208 is used to control the circulation of coolant in the first container 102 in the third circuit;

[0110] The third temperature sensor 209 is used to detect the third temperature of the coolant in the third circuit and send the third temperature to the first control unit 204;

[0111] The first control unit 204 is configured to control the system 10, the inverter 105, and the at least two motors to operate when the third temperature is less than or equal to the fifth preset threshold; and to control the system 10, the inverter 105, and the at least two motors to stop operating when the third temperature is greater than the fifth preset threshold.

[0112] The third pressure sensor 210 is used to detect the third pressure of the coolant in the third circuit and send the third pressure to the first control unit 204;

[0113] The first control unit 204 is used to control the system 10, the inverter 105 and the at least two motors to work when the third pressure is less than or equal to the sixth preset threshold; and to control the system 10, the inverter 105 and the at least two motors to stop working when the third pressure is greater than the sixth preset threshold.

[0114] It should be noted that the control unit 204 is connected to the third temperature sensor 209 and the third pressure sensor 210 respectively. The connection relationship is not limited here. As an example, the control unit 204 can be wirelessly connected to the third temperature sensor 209 and the third pressure sensor 210 respectively.

[0115] In this embodiment, the fourth power component 208 is used to control the circulation of coolant in the first container 102 in the third circuit. As an example, the fourth power component 208 can be a water pump 2. The third temperature sensor 209 can be a temperature sensor 2; the third pressure sensor 210 can be a pressure sensor 2.

[0116] It should be noted that the third temperature sensor 209 and the third pressure sensor 210 transmit the measured data to the first control unit 204 in real time. When the third temperature detected by the third temperature sensor 209 exceeds the fifth preset threshold and / or the third pressure detected by the third pressure sensor 210 exceeds the sixth preset threshold, the first control unit 204 receives the information and can stop the entire system 10, the inverter 105 and the motor from working.

[0117] The fifth and sixth preset thresholds can be determined based on actual circumstances and are not limited here. It should be noted that the fifth preset threshold can be the same as the first preset threshold; the sixth preset threshold can be the same as the second preset threshold.

[0118] For ease of understanding, here is an example: the coolant in radiator 2 flows into the converter through water pump 2, temperature sensor 2 and pressure sensor 2. The heat-generating components of the converter work, causing the temperature of the coolant to rise. Finally, the coolant returns to radiator 2 for heat dissipation. A dual-shaft fan is used to dissipate heat from radiator 2.

[0119] In an optional embodiment of the present invention, the first heat dissipation device 103 is connected to the third motor 211 and the fourth motor 212, which are connected in parallel among the at least two motors, through a fourth pipe 14 to form a fourth circuit; a fifth power assembly 213 is provided on the fourth pipe 14 near the first heat dissipation device 103 and a fourth temperature sensor 214 is provided near the third motor 211 and the fourth motor 212, which are connected in parallel among the at least two motors; a fourth pressure sensor 215 is provided between the fifth power assembly 213 and the fourth temperature sensor 214;

[0120] The fifth power assembly 213 is used to control the circulation of coolant in the first container 102 in the fourth circuit.

[0121] The fourth temperature sensor 214 is used to detect the fourth temperature of the coolant in the fourth circuit and send the fourth temperature to the first control unit 204.

[0122] The first control unit 204 is used to control the parallel-connected third motor 211 and fourth motor 212 to work when the fourth temperature is less than or equal to the seventh preset threshold; and to control the parallel-connected third motor 211 and fourth motor 212 to stop working when the fourth temperature is greater than the seventh preset threshold.

[0123] The fourth pressure sensor 215 is used to detect the fourth pressure of the coolant in the fourth circuit and send the fourth pressure to the first control unit 204;

[0124] The first control unit 204 is used to control the parallel-connected third motor 211 and fourth motor 212 to work when the fourth pressure is less than or equal to the eighth preset threshold; and to control the parallel-connected third motor 211 and fourth motor 212 to stop working when the fourth pressure is greater than the eighth preset threshold.

[0125] It should be noted that the control unit 204 is connected to the fourth temperature sensor 214 and the fourth pressure sensor 215 respectively. The connection relationship is not limited here. As an example, the control unit 204 can be wirelessly connected to the fourth temperature sensor 214 and the fourth pressure sensor 215 respectively.

[0126] In this embodiment, the fifth power component 213 is used to control the circulation of coolant in the first container 102 in the fourth circuit. As an example, the fifth power component 213 can be a water pump 3. The fourth temperature sensor 214 can be a temperature sensor 3; the fourth pressure sensor 215 can be a pressure sensor 3.

[0127] It should be noted that, in this embodiment, as Figure 2 As shown, the first motor 106 is M3; the second motor 107 is M4; the third motor 211 is M1; and the fourth motor 212 is M2.

[0128] It should be noted that the fourth temperature sensor 214 and the fourth pressure sensor 215 transmit the measured data to the first control unit 204 in real time. When the fourth temperature detected by the fourth temperature sensor 214 exceeds the seventh preset threshold and / or the fourth pressure detected by the fourth pressure sensor 215 exceeds the eighth preset threshold, the first control unit 204 receives the information and can stop the third motor 211 and the fourth motor 212 connected in parallel from working.

[0129] The seventh and eighth preset thresholds can be set according to actual conditions and are not limited here. It should be noted that the seventh preset threshold can be the same as the third preset threshold; the eighth preset threshold can be the same as the fourth preset threshold.

[0130] For ease of understanding, an example is given here: the coolant in radiator 1 flows into the motor through water pump 3, pressure sensor 3, and temperature sensor 3. The motor's heat-generating components work, causing the coolant temperature to rise. Finally, the coolant returns to radiator 1 for heat dissipation. A dual-shaft fan is used to dissipate heat from radiator 1.

[0131] In the above embodiment, radiator 1 and radiator 2 are respectively connected to the inverter and motor for coolant circulation, so the water circuit is in parallel and has four circulations.

[0132] It should be noted that the embodiments of the present invention also include an expansion tank. Figure 2 Not shown in the diagram, the expansion tank is located at the highest point of the entire cooling pipeline, meaning it can be located inside the radiator. The inlet and outlet pipes are connected to the expansion tank via stainless steel pipes, respectively. The liquid level can be displayed using the level gauge on the expansion tank. Excessive coolant and air bubbles generated during coolant circulation can be released through the pressure relief valve on the expansion tank. The pressure relief valve is connected to a rubber hose, which extends out of the converter cabinet through a sealable through-wall terminal to ensure the safety of the electrical components inside the converter.

[0133] By employing the technical solution of this invention, a double-layer composite radiator can be used, which can reduce the size of the radiator in the direction of travel, making it more conducive to the miniaturization design of the traction system.

[0134] In one embodiment of the present invention, the control of the first heat dissipation device 103 and the second heat dissipation device 104 is connected in series. Figure 3 This is a schematic diagram of the composition of another cooling system with series airflow provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the following will be combined with Figure 3 To illustrate, the first pipeline 11 is equipped with a sixth power assembly 301 near the first heat dissipation device 103 and a fifth pressure sensor 303 near the converter 105; a fifth temperature sensor 302 is disposed between the sixth power assembly 301 and the fifth pressure sensor 303; the control device further includes a second control unit 304; the second control unit 304 is connected to the fifth temperature sensor 302 and the fifth pressure sensor 303 respectively; the first circuit also includes a second heat dissipation device 104; the second heat dissipation device 104 is disposed between the converter 105 and the first heat dissipation device 103;

[0135] The sixth power component 301 is used to control the coolant in the first container 102 to circulate in the first circuit.

[0136] The fifth temperature sensor 302 is used to detect the fifth temperature of the coolant in the first circuit and send the fifth temperature to the second control unit 304;

[0137] The second control unit 304 is used to control the system 10, the inverter 105 and the at least two motors to work when the fifth temperature is less than or equal to the ninth preset threshold; and to control the system 10, the inverter 105 and the at least two motors to stop working when the fifth temperature is greater than the ninth preset threshold.

[0138] The fifth pressure sensor 303 is used to detect the fifth pressure of the coolant in the first circuit and send the fifth pressure to the second control unit 304;

[0139] The second control unit 304 is used to control the system 10, the inverter 105 and the at least two motors to work when the fifth pressure is less than or equal to the tenth preset threshold; and to control the system 10, the inverter 105 and the at least two motors to stop working when the fifth pressure is greater than the tenth preset threshold.

[0140] It should be noted that, Figure 3The second control unit 304 is not shown in the diagram. It is located inside system 10. The connection between the second control unit 304 and the fifth temperature sensor 302 and the fifth pressure sensor 303 is not specified here. As an example, the second control unit 304 is wirelessly connected to both the fifth temperature sensor 302 and the fifth pressure sensor 303. It is important to understand that the fifth temperature sensor 302 and the fifth pressure sensor 303 transmit measured data to the second control unit 304 in real time. When the fifth temperature detected by the fifth temperature sensor 302 exceeds a ninth preset threshold and / or the fifth pressure detected by the fifth pressure sensor 303 exceeds a tenth preset threshold, the second control unit 304, upon receiving this information, can stop the entire system 10, the inverter 105, and the motor from operating.

[0141] The ninth and tenth preset thresholds can be determined according to the actual situation, and are not limited here.

[0142] In this embodiment, the sixth power component 301 is used to control the coolant in the first container 102 to circulate in the first circuit. As an example, the sixth power component 301 can be a water pump 1; the fifth temperature sensor 302 can be a temperature sensor 1; and the fifth pressure sensor can be a pressure sensor 1.

[0143] It should be noted that, in this embodiment, the first heat dissipation device 103 can be a double-layer composite heat sink 1, with the outer side being a heat sink for the converter and the inner side being a heat sink for the traction motor; the second heat dissipation device 104 can be a double-layer composite heat sink 2, with the outer side being a heat sink for the converter and the inner side being a heat sink for the traction motor.

[0144] For ease of understanding, an example is given here: the coolant in radiator 1 flows into the converter through water pump 1, temperature sensor 1, and pressure sensor 1. The heat-generating components in the converter work, causing the temperature of the coolant to rise. Finally, the coolant returns to radiator 1 through radiator 2. A dual-axis fan is used to dissipate heat from radiators 1 and 2.

[0145] In an optional embodiment of the present invention, a seventh power assembly 305 is disposed on the second pipeline 12 near the first heat dissipation device 103, and a sixth temperature sensor 306 is disposed near the fifth motor 308 and the sixth motor 309 connected in parallel among the at least two motors; a sixth pressure sensor 307 is disposed between the seventh power assembly 305 and the sixth temperature sensor 306; the second heat dissipation device 104 is connected to the first heat dissipation device 103 through the second pipeline 12; the first motor 106 and the second motor 107, after being connected in parallel, are connected in parallel with the fifth motor 308 and the sixth motor 309, after being connected in parallel;

[0146] The seventh power component 305 is used to control the coolant in the first container 102 to circulate in the second circuit;

[0147] The sixth temperature sensor 306 is used to detect the sixth temperature of the coolant in the second circuit and send the sixth temperature to the second control unit 304;

[0148] The second control unit 304 is used to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected fifth motor 308 and sixth motor 309 to work when the sixth temperature is less than or equal to the eleventh preset threshold; and to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected fifth motor 308 and sixth motor 309 to stop working when the sixth temperature is greater than the eleventh preset threshold.

[0149] The sixth pressure sensor 307 is used to detect the sixth pressure of the coolant in the second circuit and send the sixth pressure to the second control unit 304;

[0150] The second control unit 304 is used to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected fifth motor 308 and sixth motor 309 to work when the sixth pressure is less than or equal to the twelfth preset threshold; and to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected fifth motor 308 and sixth motor 309 to stop working when the sixth pressure is greater than the twelfth preset threshold.

[0151] It should be noted that the second control unit 304 is connected to the sixth temperature sensor 306 and the sixth pressure sensor 307 respectively. The connection relationship is not limited here. As an example, the second control unit 304 can be wirelessly connected to the sixth temperature sensor 306 and the sixth pressure sensor 307 respectively.

[0152] In this embodiment, the parallel connection of the first motor 106 and the second motor 107 after parallel connection with the fifth motor 308 and the sixth motor 309 after parallel connection can be understood as the first motor 106 and the second motor 107 being connected in parallel, the fifth motor 308 and the sixth motor 309 being connected in parallel, and then the two being connected in parallel.

[0153] In this embodiment, the seventh power component 305 is used to control the coolant in the first container 102 to circulate in the second circuit. As an example, the seventh power component 305 can be a water pump 2; the sixth temperature sensor 306 can be a temperature sensor 2; and the sixth pressure sensor 307 can be a pressure sensor 2.

[0154] It should be noted that, in this embodiment, as Figure 3 As shown, the first motor 106 is M3; the second motor 107 is M4; the fifth motor 308 is M1; and the sixth motor 309 is M2.

[0155] It should be noted that the sixth temperature sensor 306 and the sixth pressure sensor 307 transmit the measured data to the second control unit 304 in real time. When the sixth temperature detected by the sixth temperature sensor 306 exceeds the eleventh preset threshold and / or the sixth pressure detected by the sixth pressure sensor 307 exceeds the twelfth preset threshold, the second control unit 304 receives the information and controls the parallel-connected first motor 106 and second motor 107, and the parallel-connected fifth motor 308 and sixth motor 309 to stop working.

[0156] The eleventh and twelfth preset thresholds can be determined according to actual circumstances, and are not limited here.

[0157] For ease of understanding, an example is given here. The coolant in radiator 2 first flows into the motor through radiator 1, water pump 2, pressure sensor 2, and temperature sensor 2. The heat-generating components in the motor work, causing the temperature of the coolant to rise. Finally, the coolant returns to radiator 2 for heat dissipation. A dual-shaft fan is used to dissipate heat from radiators 1 and 2.

[0158] In the above embodiments, the cooling paths for the converter and the motor are independent and can be considered as parallel water circuits with two circulations.

[0159] It should be noted that the embodiments of the present invention also include an expansion tank. Figure 3Not shown in the diagram, the expansion tank is located at the highest point of the entire cooling pipeline, meaning it can be located inside the radiator. The inlet and outlet pipes are connected to the expansion tank via stainless steel pipes, respectively. The liquid level can be displayed using the level gauge on the expansion tank. Excessive coolant and air bubbles generated during coolant circulation can be released through the pressure relief valve on the expansion tank. The pressure relief valve is connected to a rubber hose, which extends out of the converter cabinet through a sealable through-wall terminal to ensure the safety of the electrical components inside the converter.

[0160] By employing the technical solution of this invention, a double-layer composite radiator can be used, which can reduce the size of the radiator in the direction of travel, making it more conducive to the miniaturization design of the traction system.

[0161] In an optional embodiment of the present invention, the control of the first heat dissipation device 103 and the second heat dissipation device 104 is to be connected in parallel. Figure 4 This is a schematic diagram of the composition of a cooling system with parallel airflow provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the following will be combined with Figure 4 To illustrate, the first pipeline 11 is provided with an eighth power assembly 401 near the first heat dissipation device 103 and a seventh pressure sensor 403 near the converter 105; a seventh temperature sensor 402 is provided between the eighth power assembly 401 and the seventh pressure sensor 403; the control device also includes a third control unit 404; the third control unit 404 is connected to the seventh temperature sensor 402 and the seventh pressure sensor 403 respectively;

[0162] The eighth power assembly 401 is used to control the coolant in the first container 102 to circulate in the first circuit.

[0163] The seventh temperature sensor 402 is used to detect the seventh temperature of the coolant in the first circuit and send the seventh temperature to the third control unit 404;

[0164] The third control unit 404 is used to control the system 101, the inverter 105 and the at least two motors to work when the seventh temperature is less than or equal to the thirteenth preset threshold; and to control the system 101, the inverter 105 and the at least two motors to stop working when the seventh temperature is greater than the thirteenth preset threshold.

[0165] The seventh pressure sensor 403 is used to detect the seventh pressure of the coolant in the first circuit and send the seventh pressure to the third control unit 404;

[0166] The third control unit 404 is used to control the system 10, the converter 105 and the at least two motors to work when the seventh pressure is less than or equal to the fourteenth preset threshold; and to control the system 10, the converter 105 and the at least two motors to stop working when the seventh pressure is greater than the fourteenth preset threshold.

[0167] In this embodiment, the eighth power component 401 is used to control the coolant in the first container 102 to circulate in the first circuit. As an example, the eighth power component 401 may be a water pump 1; the seventh temperature sensor 402 may be a temperature sensor 1; and the seventh pressure sensor 403 may be a pressure sensor 1.

[0168] It should be noted that, Figure 4 The third control unit 404 is not shown in the diagram. It is located inside system 10. The connection between the third control unit 404 and the seventh temperature sensor 402 and the seventh pressure sensor 403 is not specified here. As an example, the third control unit 404 can be wirelessly connected to both the seventh temperature sensor 402 and the seventh pressure sensor 403. The seventh temperature sensor 402 and the seventh pressure sensor 403 transmit measured data to the third control unit 404 in real time. When the seventh temperature detected by the seventh temperature sensor 402 exceeds a thirteenth preset threshold and / or the seventh pressure detected by the seventh pressure sensor 403 exceeds a fourteenth preset threshold, the third control unit 404, upon receiving this information, can stop the entire system 10, the inverter 105, and the motor from operating.

[0169] The thirteenth and fourteenth preset thresholds can be determined according to actual circumstances, and are not limited here.

[0170] It should be noted that in this embodiment, the first heat dissipation device 103 and the second heat dissipation device 104 are single-layer heat sinks. They can be designed as standardized heat sinks according to the heat dissipation requirements of each independent cooling and the inlet and outlet water temperature requirements, so as to achieve interchangeability and reduce the types of spare parts. The first heat dissipation device 103 can be heat sink 1; the second heat dissipation device 104 can be heat sink 2.

[0171] In an optional embodiment of the present invention, a ninth power assembly 405 is provided on the second pipeline 12 near the seventh motor 408 and the eighth motor 409 connected in parallel among the at least two motors, and an eighth pressure sensor 407 is provided near the second heat dissipation device 104; an eighth temperature sensor 406 is provided between the ninth power assembly 405 and the eighth pressure sensor 407; the first motor 106 and the second motor 107, after being connected in parallel, are connected in parallel with the seventh motor 408 and the eighth motor 409, after being connected in parallel;

[0172] The ninth power assembly 405 is used to control the coolant in the first container 102 to circulate in the second circuit;

[0173] The eighth temperature sensor 406 is used to detect the eighth temperature of the coolant in the second circuit and send the eighth temperature to the third control unit 404;

[0174] The third control unit 404 is used to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected seventh motor 408 and eighth motor 409 to work when the eighth temperature is less than or equal to the fifteenth preset threshold; and to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected seventh motor 408 and eighth motor 409 to stop working when the eighth temperature is greater than the fifteenth preset threshold.

[0175] The eighth pressure sensor 407 is used to detect the eighth pressure of the coolant in the second circuit and send the eighth pressure to the third control unit 404;

[0176] The third control unit 404 is used to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected seventh motor 408 and eighth motor 409 to work when the eighth pressure is less than or equal to the sixteenth preset threshold; and to control the parallel-connected first motor 106 and second motor 107, and the parallel-connected seventh motor 408 and eighth motor 409 to stop working when the eighth pressure is greater than the sixteenth preset threshold.

[0177] It should be noted that the third control unit 404 is connected to the eighth temperature sensor 406 and the eighth pressure sensor 407 respectively. The connection relationship is not limited here. As an example, the third control unit 404 can be wirelessly connected to the eighth temperature sensor 406 and the eighth pressure sensor 407 respectively.

[0178] In this embodiment, the parallel connection of the first motor 106 and the second motor 107 after parallel connection with the seventh motor 408 and the eighth motor 409 after parallel connection can be understood as the first motor 106 and the second motor 107 being connected in parallel, the seventh motor 408 and the eighth motor 409 being connected in parallel, and then the two being connected in parallel.

[0179] In this embodiment, the ninth power component 405 is used to control the coolant in the first container 102 to circulate in the first circuit. As an example, the ninth power component 405 may be a water pump 2; the eighth temperature sensor 406 may be a temperature sensor 2; and the eighth pressure sensor 407 may be a pressure sensor 2.

[0180] It should be noted that, in this embodiment, as Figure 4 As shown, the first motor 106 is M3; the second motor 107 is M4; the seventh motor 408 is M1; and the eighth motor 409 is M2.

[0181] It should be noted that the eighth temperature sensor 406 and the eighth pressure sensor 407 transmit the measured data to the third control unit 404 in real time. When the eighth temperature detected by the eighth temperature sensor 406 exceeds the fifteenth preset threshold and / or the eighth pressure detected by the eighth pressure sensor 407 exceeds the sixteenth preset threshold, the third control unit 404 receives the information and controls the parallel-connected first motor 106 and second motor 107, and the parallel-connected seventh motor 408 and eighth motor 409 to stop working.

[0182] The fifteenth and sixteenth preset thresholds can be determined according to the actual situation, and are not limited here.

[0183] In an optional embodiment of the present invention, the system 10 further includes a first switch 410, a second switch 411, a third switch 412, and a fourth switch 413; the first switch 410 is disposed between the first heat dissipation device 103 and the eighth power assembly 401; the second switch 411 is disposed between the first heat dissipation device 103 and the second heat dissipation device 104; the third switch 412 is disposed between the second heat dissipation device 104 and the at least two motors; and the fourth switch 413 is disposed between the at least two motors and the eighth power assembly 401.

[0184] When the first switch 410 and the third switch 412 are open, and the second switch 411 and the fourth switch 413 are closed, the coolant in the first container 102 circulates in the first circuit through the first switch 410.

[0185] When the first switch 410 and the third switch 412 are closed, and the second switch 411 and the fourth switch 413 are open, the first pipeline further includes the second switch 411, the second heat dissipation device 104, the ninth power component 405, the eighth temperature sensor 406, the eighth pressure sensor 407, the first motor 106, the second motor 107, the seventh motor 408, the eighth motor 409, and the fourth switch 413; the second pipeline further includes the fourth switch 413, the eighth power component 401, the seventh temperature sensor 402, the seventh pressure sensor 403, the converter 105, the first heat dissipation device 103, and the second switch 411.

[0186] In this embodiment, the first switch 410 can be a solenoid valve 1; the second switch 411 can be a solenoid valve 2; the third switch 412 can be a solenoid valve 3; and the fourth switch 413 can be a solenoid valve 4. It should be noted that the control commands for the aforementioned solenoid valves can be provided by the third control unit 404 or by the entire network system; this is not limited here.

[0187] It should be noted that the first switch 410 and the second switch 411 are interlocked, and the third switch 412 and the fourth switch 413 are interlocked. The first switch 410 and the third switch 412 execute the same control command, and the second switch 411 and the fourth switch 413 execute the same control command. That is, when the first switch 410 and the third switch 412 are open, the second switch 411 and the fourth switch 413 are closed; when the first switch 410 and the third switch 412 are closed, the second switch 411 and the fourth switch 413 are open.

[0188] It should be noted that the embodiments of the present invention also include an expansion tank. Figure 4 Not shown in the diagram, the expansion tank is located at the highest point of the entire cooling pipeline, meaning it can be located inside the radiator. The inlet and outlet pipes are connected to the expansion tank via stainless steel pipes, respectively. The liquid level can be displayed using the level gauge on the expansion tank. Excessive coolant and air bubbles generated during coolant circulation can be released through the pressure relief valve on the expansion tank. The pressure relief valve is connected to a rubber hose, which extends out of the converter cabinet through a sealable through-wall terminal to ensure the safety of the electrical components inside the converter.

[0189] For ease of understanding, the embodiments of the present invention will explain the two situations described above separately, when the first switch 410 and the third switch 412 are on, and the second switch 411 and the fourth switch 413 are off. Figure 5This is a schematic diagram of the composition structure of a cooling system with parallel airflow and parallel waterflow provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the following will be combined with Figure 5 To explain, Figure 5 yes Figure 4 An equivalent schematic diagram.

[0190] For ease of understanding, an example is given here: the coolant in the first heat dissipation device 103 flows into the converter 105 through the first switch 410, the eighth power component 401, the seventh temperature sensor 402, and the seventh pressure sensor 403. The operation of the heat-generating components in the converter causes the temperature of the coolant in the first circuit to rise, so the coolant returns to the first heat dissipation device 103 for cooling. The coolant in the second heat dissipation device 104 flows into the parallel-connected first motor 106, second motor 107, seventh motor 408, and eighth motor 409 through the eighth pressure sensor 407, eighth temperature sensor 406, and ninth power component 405. The operation of the heat-generating components in the motors causes the temperature of the coolant in the second circuit to rise, so the coolant returns to the second heat dissipation device 104 through the third switch 412 for cooling. The first power component 101 (e.g., a dual-shaft fan) is used to cool the first heat dissipation device 103 and the second heat dissipation device 104. In this case, the first and second circuits can be considered as parallel water circuits. Figure 6 This is a schematic diagram of the physical structure of a cooling system with parallel airflow and parallel waterflow provided in an embodiment of the present invention. Figure 6 for Figure 5 The display of physical devices, such as Figure 6 As shown, the converter-side cooling system cools the power modules and water-cooled resistors through internal piping; the motor-side cooling system connects to the car body's rigid pipes via flexible hoses outside the cabinet to cool the traction motors in the bogie area. Each cooling system independently has one radiator assembly, one water pump, and one set of cooling piping; the two cooling systems share two twin-shaft extension cooling fans, each fan assembly consisting of two collectors, two impellers, and one motor; each cooling system's main outlet pipe is equipped with a quick-release vent, supplementing the pressure relief valve at the radiator expansion tank, facilitating manual venting in case of pipe blockage requiring maintenance; high-heat-density electromagnetic components such as transformer assemblies and reactor assemblies from the converter can also be installed between the radiators and twin-shaft extension fans, utilizing the cooling air flowing through the radiators for forced air cooling, further improving the heat dissipation efficiency of the composite cooling system and achieving a highly integrated converter design; the piping design is simple, with pressure and temperature sensors for easy independent monitoring of the temperature and pressure of each cooling system. Figure 6 It can be used as a cooling system and cooling device for a new generation of permanent magnet traction systems with a speed of 400 km / h.

[0191] It should be noted that in this embodiment, the order of the eighth pressure sensor 407, the eighth temperature sensor 406, and the ninth power component 405 on the second pipeline 2 can be changed without affecting the overall effect. The positions of the water pump, pressure sensor, and temperature sensor in each loop of the system can also be changed.

[0192] The technical solution adopted in this embodiment of the invention can ensure the independence of the converter and motor water circulation, provide system redundancy, and is suitable for applications in normal temperature and high temperature environments.

[0193] When the first switch 410 and the third switch 412 are closed, and the second switch 411 and the fourth switch 413 are open. Figure 7 This is a schematic diagram of the composition structure of a cooling system with parallel airflow and series waterflow provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the following will be combined with Figure 7 To explain, Figure 7 yes Figure 4 An equivalent schematic diagram.

[0194] For ease of understanding, an example is given here: The coolant in the first heat dissipation device 103 passes through the second switch 411, the second heat dissipation device 104, the eighth pressure sensor 407, the eighth temperature sensor 406, the ninth power assembly 405, and the parallel-connected first motor 106, second motor 107, seventh motor 408, and eighth motor 409. The heating components of the motors then operate, increasing the temperature of the coolant in the first circuit. The coolant then flows into the fourth switch 413, the eighth power assembly 401, the seventh temperature sensor 402, the seventh pressure sensor 403, and the converter 105. The heating components in the converter operate, causing the temperature of the coolant in the first circuit to rise again. The coolant then returns from the converter 105 to the first heat dissipation device 103. The high-end coolant in the second heat dissipation device 104 passes through the eighth pressure sensor... 407, 406, 405, 106, 107, 408, and 409 are connected in parallel with the first motor 106, the second motor 107, the seventh motor 408, and the eighth motor 409. The heating components of the motors are working, and the temperature of the coolant in the second circuit rises. It then flows into the fourth switch 413, 401, 402, 403, and 105 with the converter. The heating components in the converter are working, and the temperature of the coolant in the second circuit rises again. The coolant then flows from the converter 105 to the first heat dissipation device 103 and back to the second heat dissipation device 104. The first circuit and the second circuit are the same. The coolant in the first heat dissipation device 103 and the second heat dissipation device 104 returns to itself after passing through the same devices. At this time, the first circuit and the second circuit can be regarded as a water circuit in series.

[0195] It should be noted that in this embodiment, when the eighth temperature detected by the eighth temperature sensor 406 is greater than the fifteenth preset threshold and / or the eighth pressure detected by the eighth pressure sensor 407 is greater than the sixteenth preset threshold, the first motor 106 and the second motor 107 connected in parallel, the seventh motor 408 and the eighth motor 409 connected in parallel, operate, and the converter 105 and the system 10 also stop operating.

[0196] It should be noted that the automatic switching between parallel and series water circuits can be controlled by opening and closing the first switch 410 (solenoid valve 1), the second switch 411 (solenoid valve 2), the third switch 412 (solenoid valve 3), and the fourth switch 413 (solenoid valve 4).

[0197] The technical solution of this invention connects the converter and the motor water circulation, and uses the heat of the motor to supply the relatively heated liquid to the converter cooling system. It can be understood that, through reasonable heat dissipation design, the cooling system of the traction motor serves as a preheating stage of the converter system; it is suitable for extremely cold operating environments, so as to reduce the temperature fluctuation range of the junction temperature of the converter power devices, reduce the impact of extremely cold weather on the life of the power devices, and at the same time ensure the heat dissipation of the converter power devices.

[0198] The methods involved in the systems disclosed in the above embodiments of the present invention can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above methods can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium, which is located in a memory. The processor reads information from the memory and, in conjunction with its hardware, completes the steps of the aforementioned methods.

[0199] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0200] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0201] In addition, in the various embodiments of the present invention, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0202] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A cooling system, characterized in that, The system is applied to a train; the system includes: at least two heat dissipation devices, a first power assembly for providing airflow, and a first container containing coolant; the first container is disposed inside the heat dissipation devices; the first power assembly is disposed between the first and second heat dissipation devices in the at least two heat dissipation devices; the first power assembly is a dual-shaft fan; the first power assembly is used to provide airflow to the first and second heat dissipation devices. One end of the first heat dissipation device is connected to one end of the converter in the train through a first pipe, and the other end of the first heat dissipation device is connected to the other end of the converter, forming a first circuit; the coolant in the first container flows into the converter through the first pipe, thereby reducing the temperature of the converter. One end of the second heat dissipation device is connected to one end of the first motor and the second motor that are connected in parallel among the at least two motors in the train through a second pipe, and the other end of the second heat dissipation device is connected to the other end of the first motor and the second motor that are connected in parallel, forming a second circuit; the coolant in the first container flows into the at least two motors through the second pipe, thereby reducing the temperature of the first motor and the second motor that are connected in parallel among the at least two motors. The system also includes a measuring device and a control device; the measuring device is connected to the converter, the motor, and the control device, respectively. The measuring device is used to measure the first temperature of the converter and the second temperature of the motor; The control device is used to determine the absolute value of the difference between the first temperature and the second temperature; when the absolute value of the difference is greater than or equal to a preset threshold, it controls the first heat dissipation device and the second heat dissipation device to be connected in series; when the absolute value of the difference is less than the preset threshold, it controls the first heat dissipation device and the second heat dissipation device to be connected in parallel. The system further includes a first switch, a second switch, a third switch, and a fourth switch; the first switch is disposed between the first heat dissipation device and the converter; the second switch is disposed between the first heat dissipation device and the second heat dissipation device; the third switch is disposed between the second heat dissipation device and the at least two motors; the fourth switch is disposed between the at least two motors and the converter; the first switch and the second switch are interlocked; the third switch and the fourth switch are interlocked; when the first switch and the third switch are open, the second switch and the fourth switch are closed; when the first switch and the third switch are closed, the second switch and the fourth switch are open.

2. The system according to claim 1, characterized in that, The control device connects the first heat dissipation device and the second heat dissipation device in series. A second power component is also provided on the first pipeline near the first heat dissipation device and a first pressure sensor is provided near the converter. A first temperature sensor is provided between the second power component and the first pressure sensor. The control device also includes a first control unit. The first control unit is connected to the first temperature sensor and the first pressure sensor respectively. The second power component is used to control the circulation of coolant in the first container in the first circuit; The first temperature sensor is used to detect the first temperature of the coolant in the first circuit and send the first temperature to the first control unit; The first control unit is used to control the system, the converter, and the at least two motors to operate when the first temperature is less than or equal to a first preset threshold. When the first temperature exceeds the first preset threshold, the system, the converter, and the at least two motors are controlled to stop working. The first pressure sensor is used to detect the first pressure of the coolant in the first circuit and send the first pressure to the first control unit; The first control unit is configured to control the system, the converter, and the at least two motors to operate when the first pressure is less than or equal to a second preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the first pressure is greater than the second preset threshold.

3. The system according to claim 2, characterized in that, A third power assembly is installed on the second pipeline near the second heat dissipation device, and a second temperature sensor is installed near the first motor and the second motor connected in parallel; a second pressure sensor is installed between the third power assembly and the second temperature sensor. The third power component is used to control the coolant in the first container to circulate in the second circuit; The second temperature sensor is used to detect the second temperature of the coolant in the second circuit and send the second temperature to the first control unit; The first control unit is used to control the operation of the first and second motors connected in parallel when the second temperature is less than or equal to a third preset threshold. When the second temperature is greater than the third preset threshold, the first and second motors connected in parallel are controlled to stop working; The second pressure sensor is used to detect the second pressure of the coolant in the second circuit and send the second pressure to the first control unit; The first control unit is configured to control the first and second motors connected in parallel to operate when the second pressure is less than or equal to a fourth preset threshold; and to control the first and second motors connected in parallel to stop operating when the second pressure is greater than the fourth preset threshold.

4. The system according to claim 3, characterized in that, The second heat dissipation device is connected to the converter through a third pipeline to form a third loop; a fourth power component is installed near the second heat dissipation device and a third pressure sensor is installed near the converter on the third pipeline; a third temperature sensor is installed between the fourth power component and the third pressure sensor; The fourth power component is used to control the circulation of coolant in the first container in the third circuit; The third temperature sensor is used to detect the third temperature of the coolant in the third circuit and send the third temperature to the first control unit; The first control unit is configured to control the system, the converter, and the at least two motors to operate when the third temperature is less than or equal to a fifth preset threshold. When the third temperature exceeds the fifth preset threshold, the system, the converter, and the at least two motors are controlled to stop working. The third pressure sensor is used to detect the third pressure of the coolant in the third circuit and send the third pressure to the first control unit; The first control unit is used to control the system, the converter, and the at least two motors to operate when the third pressure is less than or equal to a sixth preset threshold. When the third pressure exceeds the sixth preset threshold, the system, the converter, and the at least two motors are controlled to stop working.

5. The system according to claim 4, wherein the first heat dissipation device is connected to the third motor and the fourth motor connected in parallel among the at least two motors via a fourth pipe to form a fourth circuit; a fifth power component near the first heat dissipation device and a fourth temperature sensor near the third motor and the fourth motor connected in parallel among the at least two motors are provided on the fourth pipe; a fourth pressure sensor is provided between the fifth power component and the fourth temperature sensor; The fifth power component is used to control the circulation of coolant in the first container in the fourth circuit; The fourth temperature sensor is used to detect the fourth temperature of the coolant in the fourth circuit and send the fourth temperature to the first control unit; The first control unit is configured to control the parallel-connected third and fourth motors to operate when the fourth temperature is less than or equal to the seventh preset threshold; and to control the parallel-connected third and fourth motors to stop operating when the fourth temperature is greater than the seventh preset threshold. The fourth pressure sensor is used to detect the fourth pressure of the coolant in the fourth circuit and send the fourth pressure to the first control unit; The first control unit is configured to control the parallel-connected third and fourth motors to operate when the fourth pressure is less than or equal to the eighth preset threshold; and to control the parallel-connected third and fourth motors to stop operating when the fourth pressure is greater than the eighth preset threshold.

6. The system according to claim 1, characterized in that, The control device connects the first heat dissipation device and the second heat dissipation device in series. A sixth power component is installed near the first heat dissipation device and a fifth pressure sensor is installed near the converter on the first pipeline. A fifth temperature sensor is installed between the sixth power component and the fifth pressure sensor. The control device also includes a second control unit. The second control unit is connected to the fifth temperature sensor and the fifth pressure sensor respectively. The first circuit also includes the second heat dissipation device. The second heat dissipation device is installed between the converter and the first heat dissipation device. The sixth power component is used to control the circulation of coolant in the first container in the first circuit. The fifth temperature sensor is used to detect the fifth temperature of the coolant in the first circuit and send the fifth temperature to the second control unit; The second control unit is used to control the system, the converter, and the at least two motors to operate when the fifth temperature is less than or equal to the ninth preset threshold. When the fifth temperature exceeds the ninth preset threshold, the system, the converter, and the at least two motors are controlled to stop working. The fifth pressure sensor is used to detect the fifth pressure of the coolant in the first circuit and send the fifth pressure to the second control unit; The second control unit is used to control the system, the converter, and the at least two motors to operate when the fifth pressure is less than or equal to the tenth preset threshold. When the fifth pressure exceeds the tenth preset threshold, the system, the converter, and the at least two motors are controlled to stop working.

7. The system according to claim 6, characterized in that, The second pipeline is provided with a seventh power component near the first heat dissipation device and a sixth temperature sensor near the fifth and sixth motors connected in parallel among the at least two motors; a sixth pressure sensor is provided between the seventh power component and the sixth temperature sensor; the second heat dissipation device is connected to the first heat dissipation device through the second pipeline; the first motor and the second motor connected in parallel are connected in parallel with the fifth motor and the sixth motor connected in parallel; The seventh power component is used to control the circulation of coolant in the first container in the second circuit; The sixth temperature sensor is used to detect the sixth temperature of the coolant in the second circuit and send the sixth temperature to the second control unit; The second control unit is used to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to work when the sixth temperature is less than or equal to the eleventh preset threshold; and to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to stop working when the sixth temperature is greater than the eleventh preset threshold. The sixth pressure sensor is used to detect the sixth pressure of the coolant in the second circuit and send the sixth pressure to the second control unit; The second control unit is used to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to work when the sixth pressure is less than or equal to the twelfth preset threshold; and to control the parallel-connected first and second motors, and the parallel-connected fifth and sixth motors to stop working when the sixth pressure is greater than the twelfth preset threshold.

8. The system according to claim 1, characterized in that, The control device connects the first heat dissipation device and the second heat dissipation device in parallel. An eighth power component is installed near the first heat dissipation device and a seventh pressure sensor is installed near the converter on the first pipeline. A seventh temperature sensor is installed between the eighth power component and the seventh pressure sensor. The control device also includes a third control unit. The third control unit is connected to the seventh temperature sensor and the seventh pressure sensor respectively. The eighth power component is used to control the circulation of coolant in the first container in the first circuit. The seventh temperature sensor is used to detect the seventh temperature of the coolant in the first circuit and send the seventh temperature to the third control unit; The third control unit is used to control the system, the converter, and the at least two motors to operate when the seventh temperature is less than or equal to the thirteenth preset threshold. When the seventh temperature exceeds the thirteenth preset threshold, the system, the converter, and the at least two motors are controlled to stop working. The seventh pressure sensor is used to detect the seventh pressure of the coolant in the first circuit and send the seventh pressure to the third control unit; The third control unit is used to control the system, the converter, and the at least two motors to operate when the seventh pressure is less than or equal to the fourteenth preset threshold; and to control the system, the converter, and the at least two motors to stop operating when the seventh pressure is greater than the fourteenth preset threshold.

9. The system according to claim 8, characterized in that, The second pipeline is provided with a ninth power assembly near the seventh and eighth motors connected in parallel among the at least two motors, and an eighth pressure sensor near the second heat dissipation device; an eighth temperature sensor is provided between the ninth power assembly and the eighth pressure sensor; the first motor and the second motor connected in parallel are connected in parallel with the seventh motor and the eighth motor connected in parallel. The ninth power component is used to control the circulation of coolant in the first container in the second circuit; The eighth temperature sensor is used to detect the eighth temperature of the coolant in the second circuit and send the eighth temperature to the third control unit; The third control unit is used to control the operation of the first and second motors connected in parallel, and the seventh and eighth motors connected in parallel, when the eighth temperature is less than or equal to the fifteenth preset threshold. When the eighth temperature exceeds the fifteenth preset threshold, the first and second motors connected in parallel, as well as the seventh and eighth motors connected in parallel, are controlled to stop working. The eighth pressure sensor is used to detect the eighth pressure of the coolant in the second circuit and send the eighth pressure to the third control unit; The third control unit is used to control the parallel-connected first and second motors, and the parallel-connected seventh and eighth motors to work when the eighth pressure is less than or equal to the sixteenth preset threshold; and to control the parallel-connected first and second motors, and the parallel-connected seventh and eighth motors to stop working when the eighth pressure is greater than the sixteenth preset threshold.

10. The system according to claim 9, characterized in that, The system further includes a first switch, a second switch, a third switch, and a fourth switch; the first switch is disposed between the first heat dissipation device and the eighth power assembly; the second switch is disposed between the first heat dissipation device and the second heat dissipation device; the third switch is disposed between the second heat dissipation device and the at least two motors; and the fourth switch is disposed between the at least two motors and the eighth power assembly. When the first switch and the third switch are open, and the second switch and the fourth switch are closed, the coolant in the first container circulates in the first circuit through the first switch; When the first switch and the third switch are closed, and the second switch and the fourth switch are open, the first pipeline further includes the second switch, the second heat dissipation device, the ninth power component, the eighth temperature sensor, the eighth pressure sensor, the first motor, the second motor, the seventh motor, the eighth motor, and the fourth switch; the second pipeline further includes the fourth switch, the eighth power component, the seventh temperature sensor, the seventh pressure sensor, the converter, the first heat dissipation device, and the second switch.

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