Subway vehicle-mounted brake resistor waste heat recovery system based on thermoelectric power generation

Abstract

The utility model relates to a subway vehicle-mounted brake resistor waste heat recovery system based on thermoelectric power generation, which comprises a vehicle-mounted brake resistor box, a thermoelectric power generation assembly, a liquid cooling temperature control system and an electric power conversion control system, the liquid cooling temperature control system comprises a liquid cooling device and a temperature control center, the liquid cooling device is arranged on the surface of the thermoelectric power generation sheet assembly and electrically connected to the temperature control center, the liquid cooling device is used for improving the power generation efficiency of the thermoelectric power generation assembly, and the power conversion system is used for converting direct current generated by the thermoelectric power generation assembly into a stable power supply used by conventional electric equipment of the vehicle. The device has the advantages that waste heat generated by the brake resistor can be effectively recycled and converted, the thermoelectric power generation efficiency can be improved to the maximum degree through the temperature difference, and the double benefits of heat dissipation and energy conservation are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of braking resistor heat recovery technology, specifically relating to a subway vehicle-mounted braking resistor waste heat recovery system based on thermoelectric power generation. Background Technology

[0002] During the braking process of existing subways, the traction motor turns into a generator to generate electricity. When the train speed is high, the commonly used braking method is regenerative braking. That is, during the braking process, the traction motor is connected to the braking resistor box, so that the braking resistor box converts the excess electrical energy that the regenerative braking cannot absorb into heat energy through Joule heating and dissipates it directly into the environment. However, due to the lack of an effective mechanism for recovering the waste heat generated by the braking resistor, the existing regenerative braking method is no longer in line with the technical trend of green and low-carbon development of rail transit.

[0003] The prior art disclosed in CN223598482U is a forced air-cooled braking resistor duct structure. This duct structure allows airflow to be evenly distributed within the housing duct, avoiding blind spots in the airflow that could cause localized overheating of the braking resistor. It also effectively reduces the adverse effects of runaway airflow generated during train movement on resistor heat dissipation, thus improving heat dissipation efficiency. However, this technical solution mainly focuses on the heat dissipation reliability of the braking resistor, neglecting heat recovery, resulting in energy waste.

[0004] The prior art disclosed in CN208061751U is an energy-saving braking resistor box. This resistor box recovers and utilizes the heat generated by the braking resistor by setting a semiconductor thermoelectric generator, which has the advantages of energy saving and environmental protection. However, this technical solution only uses a cooling fan to dissipate heat from the resistor box, resulting in poor temperature difference stability and low values. This leads to low power generation efficiency of the thermoelectric generator, and the cooling fan consumes additional energy, which further increases the vehicle's energy consumption. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a waste heat recovery system for subway vehicle braking resistors based on thermoelectric power generation. This system can effectively recover and convert the waste heat generated by the braking resistors and maximize the efficiency of thermoelectric power generation through temperature difference, achieving the dual benefits of "heat dissipation + energy saving".

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A waste heat recovery system for subway vehicle braking resistors based on thermoelectric power generation includes:

[0008] On-board brake resistor box and thermoelectric generator assembly. The thermoelectric generator assembly is located on the surface of the on-board brake resistor box and is used to absorb and convert the heat dissipated by the brake resistor.

[0009] The liquid-cooled temperature control system includes a liquid cooling device and a temperature control center. The liquid cooling device is located on the surface of the thermoelectric generator assembly and is electrically connected to the temperature control center. The liquid cooling device is used to improve the power generation efficiency of the thermoelectric generator assembly.

[0010] The power conversion control system is electrically connected to the thermoelectric generator assembly. The power conversion system is used to convert the DC power generated by the thermoelectric generator assembly into a stable power supply for the vehicle's conventional electrical equipment.

[0011] Furthermore, the thermoelectric generator assembly includes thermally conductive silicone grease and a thermoelectric generator plate. The thermoelectric generator plate is attached to the surface of the vehicle braking resistor box, and the thermally conductive silicone grease is filled between the hot end of the thermoelectric generator plate and the vehicle braking resistor box.

[0012] Furthermore, the liquid cooling device includes a cooling pipe, a connecting pipe, a first heat dissipation fin, a second heat dissipation fin, and a pump. The first heat dissipation fin is located on both side walls of the braking resistor box, and the second heat dissipation fin is located on the end of the braking resistor box opposite to the exhaust port. Both the first and second heat dissipation fins are in contact with the cold end of the thermoelectric generator. The two sides of the two first heat dissipation fins are connected by a connecting pipe, and the two ends of the second heat dissipation fin are connected to one end of the two heat dissipation fins respectively by a connecting pipe. The two sides of the second heat dissipation fin are connected to the cooling pipe between the two first heat dissipation fins by a connecting pipe. The pump is located on the connecting pipe and electrically connected to the control center.

[0013] Furthermore, the power conversion control system includes an inverter, a boost regulator, and a thermoelectric generator, which are electrically connected in sequence.

[0014] Furthermore, there are two pumps, which are arranged obliquely symmetrically about the second heat dissipation fins.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention utilizes a thermoelectric generator, a liquid-cooled temperature control system, and a power conversion control system. During the braking process of a subway vehicle, the thermoelectric generator absorbs the heat dissipated by the braking resistor and converts the heat into direct current. The power conversion system then converts the direct current generated by the thermoelectric generator into a stable power supply for the vehicle's conventional electrical equipment (such as lighting, ventilation, and onboard control systems). This achieves energy feedback and forms an energy recovery loop of "braking heat energy - electrical energy - vehicle power consumption." The liquid-cooled temperature control system can improve and ensure the power generation efficiency of the thermoelectric generator during the thermoelectric conversion process, ultimately achieving the dual benefits of "heat dissipation + energy saving." Attached Figure Description

[0017] Figure 1A schematic diagram showing the installation of onboard braking resistor boxes and low-voltage distribution boxes on existing subway vehicles;

[0018] Figure 2 This is a schematic diagram of the installation of the thermoelectric generator assembly in this utility model;

[0019] Figure 3 This is a schematic diagram of the installation of the liquid cooling device in the vehicle-mounted brake resistor box in this utility model.

[0020] In the diagram: 1. Vehicle-mounted braking resistor box; 2. Low-voltage distribution box; 4. Thermoelectric generator; 5. Cooling pipe; 6. Connecting pipe; 7. First heat dissipation fin; 8. Second heat dissipation fin; 9. Pump. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0022] like Figures 1-3 As shown, a waste heat recovery system for subway vehicle braking resistors based on thermoelectric power generation includes an on-board braking resistor box 1, a thermoelectric power generation component, a liquid-cooled temperature control system, and a power conversion control system. The on-board braking resistor box 1 is a conventional device on existing subways. The box body of the on-board braking resistor box 1 has a semi-enclosed cuboid structure, with the braking resistor component installed inside and an exhaust vent at the front end. The thermoelectric power generation component is installed on the surface of the box body of the on-board braking resistor box 1. The liquid-cooled temperature control system includes a liquid cooling device and a temperature control center. The liquid cooling device is installed on the surface of the thermoelectric power generation component and electrically connected to the temperature control center. The power conversion control system and the temperature control center are integrated in a low-voltage distribution box 2 on the subway.

[0023] The thermoelectric generator is used to absorb the heat dissipated by the braking resistor and convert the heat into direct current. The power conversion system is used to convert the direct current generated by the thermoelectric generator into a stable power supply for conventional vehicle electrical equipment (such as lighting, ventilation, vehicle control system, etc.), realizing the feedback utilization of electrical energy. Finally, through the use of the thermoelectric generator and the liquid cooling temperature control system, an energy recovery loop of "braking heat energy - electrical energy - vehicle power consumption" is formed as a whole. The liquid cooling device is used to improve the power generation efficiency of the thermoelectric generator when it is working under the control of the control center.

[0024] like Figure 2As shown, the thermoelectric generator assembly includes thermally conductive silicone grease and a thermoelectric generator plate 4. The thermoelectric generator plate 4 is attached to the surface of the vehicle-mounted brake resistor box 1, and the thermally conductive silicone grease is filled between the hot end of the thermoelectric generator plate 4 and the box of the vehicle-mounted brake resistor box 1. The power generation principle of the thermoelectric generator plate 4 is based on the Seebeck effect. By filling with thermally conductive silicone grease, thermal coupling is formed between the hot end of the thermoelectric generator plate 4 and the box of the vehicle-mounted brake resistor box 1. The heat generated by the brake resistor is then conducted to the hot end of the thermoelectric generator plate 4 through the thermally conductive silicone grease, and the thermoelectric generator plate 4 generates electricity based on the temperature difference between the hot and cold ends.

[0025] The power conversion control system includes an inverter, a boost regulator, a thermoelectric generator 4, and the inverter and boost regulator connected in sequence. The DC power generated by the thermoelectric generator 4 is converted into AC power by the inverter, and then regulated by the boost regulator to provide a stable power supply for the vehicle.

[0026] like Figure 3 As shown, the liquid cooling device includes a cooling pipe 5, a connecting pipe 6, a first heat dissipation fin 7, a second heat dissipation fin 8, and a pump 9. The first heat dissipation fin 7 is attached to the two side walls of the braking resistor box, and the second heat dissipation fin 8 is attached to the end of the braking resistor box opposite to the exhaust port. Both the first heat dissipation fin 7 and the second heat dissipation fin 8 are attached to the cold end of the thermoelectric generator 4. The two sides of the two first heat dissipation fins 7 are connected by the connecting pipe 6. The two ends of the second heat dissipation fin 8 are respectively connected to one end of the two heat dissipation fins by the connecting pipe 6. The two sides of the second heat dissipation fin 8 are connected to the cooling pipe 5 between the two first heat dissipation fins 7 by the connecting pipe 6. The pump 9 is installed on the connecting pipe 6 and electrically connected to the control center.

[0027] In this invention, two pumps 9 are provided, and the two pumps 9 are obliquely symmetrically arranged about the second heat dissipation fins 8. The cooling pipe 5 is filled with coolant, and the pumps 9 serve as the power source to drive the coolant to circulate between the cooling pipe 5 and the heat dissipation fins. This forces the coolant to remove the heat from the cold end of the thermoelectric generator 4. At the same time, the control center can dynamically adjust the pump speed and flow rate of the pumps 9 according to the braking conditions, thereby dynamically controlling the heat dissipation intensity of the cold end of the thermoelectric generator 4. Under the premise of ensuring the safety of heat dissipation of the braking resistor, the cold end of the thermoelectric generator 4 is kept at a low temperature. This maximizes the temperature difference between the hot and cold ends of the thermoelectric generator 4, thereby improving and ensuring the power generation efficiency of the thermoelectric generator 4.

[0028] Based on the aforementioned waste heat recovery system for subway vehicle braking resistors and its related working principle, this utility model integrates a thermoelectric generator assembly on the outer surface of the braking resistor box and sets up a high-efficiency liquid-cooled temperature control system to create a stable temperature difference environment between the hot and cold ends of the thermoelectric generator 4. This converts part of the waste heat generated by the braking resistor into electrical energy, and uses a power conversion control system to feed the generated energy back to the vehicle's low-voltage auxiliary power supply system for use by conventional electrical equipment such as lighting, ventilation, and control. This not only effectively recovers and converts the waste heat generated by the braking resistor, but also maximizes the thermoelectric power generation efficiency through temperature difference, achieving the dual benefits of "heat dissipation + energy saving".

[0029] Finally, although the embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A subway vehicle-mounted braking resistor waste heat recovery system based on thermoelectric power generation, characterized in that, include: Vehicle-mounted brake resistor box (1) and thermoelectric generator assembly. The thermoelectric generator assembly is located on the surface of the vehicle-mounted brake resistor box (1) and is used to absorb and convert the heat dissipated by the brake resistor. The liquid-cooled temperature control system includes a liquid cooling device and a temperature control center. The liquid cooling device is located on the surface of the thermoelectric generator assembly and is electrically connected to the temperature control center. The liquid cooling device is used to improve the power generation efficiency of the thermoelectric generator assembly. The power conversion control system is electrically connected to the thermoelectric generator assembly. The power conversion system is used to convert the DC power generated by the thermoelectric generator assembly into a stable power supply for the vehicle's conventional electrical equipment.

2. The thermoelectric power generation based subway vehicle-mounted braking resistance waste heat recovery system according to claim 1, characterized in that: The thermoelectric generator assembly includes thermal grease and thermoelectric generator (4). The thermoelectric generator (4) is attached to the surface of the vehicle brake resistor box (1). The thermal grease is filled between the hot end of the thermoelectric generator (4) and the body of the vehicle brake resistor box (1).

3. The thermoelectric power generation based metro on-board brake resistor waste heat recovery system according to claim 2, characterized in that: The liquid cooling device includes a cooling pipe (5), a connecting pipe (6), a first heat dissipation fin (7), a second heat dissipation fin (8), and a pump (9). The first heat dissipation fin (7) is located on the two side walls of the braking resistor box, and the second heat dissipation fin (8) is located on the end of the braking resistor box opposite to the exhaust port. The first heat dissipation fin (7) and the second heat dissipation fin (8) are both in contact with the cold end of the thermoelectric generator (4). The two sides of the two first heat dissipation fins (7) are connected through the connecting pipe (6). The two ends of the second heat dissipation fin (8) are connected to one end of the two heat dissipation fins through the connecting pipe (6). The two sides of the second heat dissipation fin (8) are connected to the cooling pipe (5) between the two first heat dissipation fins (7) through the connecting pipe (6). The pump (9) is located on the connecting pipe (6) and electrically connected to the control center.

4. The thermoelectric power generation based metro on-board brake resistor waste heat recovery system according to claim 2, characterized in that: The power conversion control system includes an inverter, a boost regulator, a thermoelectric generator (4), and the inverter and boost regulator are electrically connected in sequence.

5. The thermoelectric power generation based subway vehicle-mounted braking resistance waste heat recovery system according to claim 4, characterized in that: Two pumps (9) are provided, and the two pumps (9) are arranged obliquely symmetrically about the second heat dissipation fins (8).

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