Metro kinetic energy recovery and conversion device

Abstract

The utility model discloses a subway kinetic energy recovery and conversion device which comprises a wheel set, an air spring, a shock absorber, a driving motor, a framework, a traction device and a reduction gearbox, the wheel set is composed of an axle and two wheels, and two kinetic energy conversion mechanisms are symmetrically installed on the framework; the kinetic energy conversion mechanism is composed of a generator, a friction wheel, a mounting frame, a protection mechanism, a wheel carrier and a hydraulic cylinder, the mounting frame is welded to the framework, the hydraulic cylinder is arranged at the other end of the mounting frame, the protection mechanism is fixedly connected to the output end of the hydraulic cylinder, and the wheel carrier is fixedly connected to the end, away from the hydraulic cylinder, of the protection mechanism; the friction wheel is installed in the wheel carrier, and the generator is fixedly connected to the surface of the wheel carrier. The friction wheel is in contact with the wheel through the hydraulic cylinder when a train is braked, the wheel drives the friction wheel to rotate, kinetic energy is converted into electric energy through the generator, and abrasion of a brake disc can be reduced while part of the kinetic energy is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving equipment for rail vehicles, and in particular to a kinetic energy recovery and conversion device for subways. Background Art

[0002] With the increasing development of urban transportation and the rapid growth of rail transit, subways, rail transit, and other transportation options have become important means of transportation in large and medium-sized cities. Urban transportation is characterized by high speeds, frequent starting and braking, and the large amount of energy generated during braking. To recover this energy, a common method is to install an inverter between the DC bus of the traction substation and the AC grid, converting excess regenerative braking energy back into the AC grid. Specifically, when a train decelerates or brakes, the traction motor, originally used to propel the train forward, automatically switches to generator mode. This transition is based on Faraday's law of electromagnetic induction, which states that when a conductor moves in a magnetic field, it generates current. During this process, the train's kinetic energy is converted into electrical energy by the traction motor's rotor. This energy is then fed back to the subway's power supply network via the inverter and pantograph.

[0003] When a subway train brakes, friction braking (brake pads / brake discs or brake shoes / wheels) is used, and a large amount of kinetic energy is converted into heat energy, resulting in kinetic energy waste, and the brake discs will also be worn. Utility Model Content

[0004] The purpose of this utility model is to provide a subway kinetic energy recovery and conversion device, which can recover part of the kinetic energy and convert it into electrical energy, reduce the heat energy generated during braking, reduce the load on the brake disc, and extend the service life.

[0005] In order to achieve the above-mentioned purpose, a subway kinetic energy recovery and conversion device is provided, which includes a wheelset, an air spring, a shock absorber, a drive motor, a frame, a traction device and a reduction gearbox. The wheelset, air spring, shock absorber, drive motor, traction device and reduction gearbox are installed on the frame, and there are two wheelsets. The wheelset consists of an axle and two wheels. Two kinetic energy conversion mechanisms are symmetrically installed on the frame. The kinetic energy conversion mechanisms roll on the surface of the wheelset. The kinetic energy conversion mechanism consists of a generator, a friction wheel, a mounting frame, a protective mechanism, a wheel frame and a hydraulic cylinder. The frame is welded to the structure. The hydraulic cylinder is located at the other end of the mounting frame. Two hydraulic cylinders are symmetrically fixed to the mounting frame. The output ends of the two hydraulic cylinders face the two wheels of the wheelset respectively. The protective mechanism is fixedly connected to the output ends of the hydraulic cylinders. The wheel carrier is fixedly connected to the end of the protective mechanism away from the hydraulic cylinders. The friction wheel is mounted in the wheel carrier and is rotatably connected to the wheel carrier via a rotating shaft. The surface of the friction wheel contacts the side of the wheel. The generator is fixedly connected to the surface of the wheel carrier, and the input shaft of the generator is connected to the rotating shaft of the friction wheel via a coupling. The system can recover some kinetic energy and convert it into electrical energy, reducing the heat generated during braking, reducing the load on the brake disc, and extending the service life.

[0006] According to the aforementioned subway kinetic energy recovery and conversion device, the protective mechanism consists of a sleeve, a protective spring, and a sliding rod. The sleeve is fixedly connected to the hydraulic cylinder, the protective spring is disposed within the sleeve, and one end of the protective spring is fixedly connected to the sleeve. The sliding rod is disposed within the sleeve and slidably connected to the inner wall of the sleeve, and the other end of the protective spring is fixedly connected to the sliding rod. The end of the sliding rod facing the wheel passes through the sleeve, and the end of the sliding rod facing the wheel is fixedly connected to the wheel frame. When the hydraulic cylinder pushes the friction wheel into contact with the wheel and continues to push the friction wheel, the sliding rod enters the sleeve, compressing the protective spring and preventing damage to the friction wheel.

[0007] According to the subway kinetic energy recovery and conversion device, the surface of the friction wheel is coated with rubber with a high friction coefficient, thereby increasing the friction coefficient of the friction wheel surface and improving the kinetic energy recovery efficiency of the friction wheel to the wheel.

[0008] According to the aforementioned subway kinetic energy recovery and conversion device, a displacement sensor is fixedly connected to the end of the sleeve's inner wall away from the sliding rod. The displacement sensor detects the displacement of the sliding rod. The displacement sensor monitors the amount of movement of the sliding rod within the sleeve, thereby stopping the hydraulic cylinder when the friction wheel contacts the wheel and pushes the sliding rod into the sleeve.

[0009] According to the aforementioned subway kinetic energy recovery and conversion device, the electric energy generated by the generator is fed back to the subway's power supply network through the train's inverter and pantograph, so as to store the electric energy converted from the kinetic energy recovered by the device.

[0010] The above scheme has the beneficial effect of: the hydraulic cylinder brings the friction wheel into contact with the wheel when the train brakes, so that the wheel drives the friction wheel to rotate, and the generator converts kinetic energy into electrical energy, which can reduce the wear of the brake disc while recovering part of the kinetic energy.

[0011] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0013] Figure 1 This is a three-dimensional diagram of a subway kinetic energy recovery and conversion device according to the present utility model;

[0014] Figure 2 This is a three-dimensional diagram of the structure of a subway kinetic energy recovery and conversion device according to the present invention;

[0015] Figure 3 This is a three-dimensional diagram of the kinetic energy conversion mechanism of a subway kinetic energy recovery and conversion device of the present invention;

[0016] Figure 4 This is a cross-sectional view of a protective mechanism of a subway kinetic energy recovery and conversion device according to the present invention.

[0017] Legend:

[0018] 1. Wheelset; 2. Air spring; 3. Shock absorber; 4. Drive motor; 5. Kinetic energy conversion mechanism; 6. Frame; 7. Traction device; 8. Reducer; 9. Generator; 10. Friction wheel; 11. Mounting frame; 12. Protective mechanism; 13. Wheel carrier; 14. Hydraulic cylinder; 15. Sleeve; 16. Protective spring; 17. Sliding rod; 18. Displacement sensor. DETAILED DESCRIPTION

[0019] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0020] Reference Figures 1-4The utility model embodiment of a subway kinetic energy recovery and conversion device includes a wheelset 1, an air spring 2, a shock absorber 3, a drive motor 4, a frame 6, a traction device 7 and a reduction box 8. The wheelset 1, the air spring 2, the shock absorber 3, the drive motor 4, the traction device 7 and the reduction box 8 are installed on the frame 6, and there are two wheelsets 1. The wheelset 1 consists of an axle and two wheels. Two kinetic energy conversion mechanisms 5 are symmetrically installed on the frame 6. The kinetic energy conversion mechanism 5 rolls on the surface of the wheelset 1; the kinetic energy conversion mechanism 5 consists of a generator 9, a friction wheel 10, a mounting frame 11, a protective mechanism 12, a wheel frame 13 and a hydraulic cylinder 14. The mounting frame 11 is welded It is connected to the frame 6, and the hydraulic cylinder 14 is provided at the other end of the mounting frame 11. There are two hydraulic cylinders 14 and they are symmetrically fixedly connected to the mounting frame 11. The output ends of the two hydraulic cylinders 14 are respectively facing the two wheels of the wheelset 1. The protective mechanism 12 is fixedly connected to the output end of the hydraulic cylinder 14. The wheel frame 13 is fixedly connected to the end of the protective mechanism 12 away from the hydraulic cylinder 14. The friction wheel 10 is installed in the wheel frame 13, and the friction wheel 10 is rotatably connected to the wheel frame 13 through a rotating shaft. The surface of the friction wheel 10 contacts the side of the wheel. The generator 9 is fixedly connected to the surface of the wheel frame 13, and the input shaft of the generator 9 is connected to the rotating shaft of the friction wheel 10 through a coupling.

[0021] The protection mechanism 12 consists of a sleeve 15, a protection spring 16, and a sliding rod 17. The sleeve 15 is fixedly connected to the hydraulic cylinder 14. The protection spring 16 is disposed within the sleeve 15, with one end fixedly connected to the sleeve 15. The sliding rod 17 is disposed within the sleeve 15 and slidably connected to the inner wall of the sleeve 15. The other end of the protection spring 16 is fixedly connected to the sliding rod 17. The end of the sliding rod 17 facing the wheel passes through the sleeve 15, and the end of the sliding rod 17 facing the wheel is fixedly connected to the wheel frame 13. When the hydraulic cylinder 14 pushes the friction wheel 10 into contact with the wheel and continues to push the friction wheel 10, the protection mechanism 12 enters the sleeve 15 through the sliding rod 17, compressing the protection spring 16 and preventing damage to the friction wheel 10.

[0022] The surface of the friction wheel 10 is coated with rubber having a high friction coefficient, which increases the friction coefficient of the surface of the friction wheel 10 and improves the kinetic energy recovery efficiency of the friction wheel 10 to 1 wheel.

[0023] A displacement sensor 18 is fixedly connected to the end of the inner wall of the sleeve 15 away from the sliding rod 17. The displacement sensor 18 detects the displacement of the sliding rod 17. The displacement sensor 18 monitors the amount of movement of the sliding rod 17 within the sleeve 15. When the friction wheel 10 contacts the wheel and pushes the sliding rod 17 into the sleeve 15, the hydraulic cylinder 14 stops working.

[0024] The electric energy generated by the generator 9 is fed back to the subway's power supply network through the train's inverter and pantograph, and is used to store the electric energy converted from the kinetic energy recovered by the device.

[0025] Working principle: When the train brakes, the hydraulic cylinder 14 extends and pushes the friction wheel 10 to contact the wheel surface. When the hydraulic cylinder 14 extends too long, the reverse force of the friction wheel 10 in contact with the wheel pushes the sliding rod 17 into the sleeve 15, and the protective spring 16 is compressed. When the wheel rotates through friction, the friction force is driven to rotate, and part of the kinetic energy of the train is transferred to the friction force, and converted into electrical energy through the generator 9. After the braking is completed, the hydraulic cylinder 14 resets, the protective spring 16 is released, and the sliding rod 17 resets, the friction wheel 10 leaves the wheel, and the generator 9 stops generating electricity.

[0026] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A subway kinetic energy recovery and conversion device, comprising: A wheelset (1), an air spring (2), a shock absorber (3), a drive motor (4), a frame (6), a traction device (7) and a reduction gearbox (8), characterized in that the wheelset (1), the air spring (2), the shock absorber (3), the drive motor (4), the traction device (7) and the reduction gearbox (8) are mounted on the frame (6), and two wheelsets (1) are provided, the wheelset (1) is composed of an axle and two wheels, two kinetic energy conversion mechanisms (5) are symmetrically mounted on the frame (6), and the kinetic energy conversion mechanisms (5) roll on the surface of the wheelset (1); the kinetic energy conversion mechanism (5) is composed of a generator (9), a friction wheel (10), a mounting frame (11), a protective mechanism (12), a wheel frame (13) and a hydraulic cylinder (14), and the mounting frame (11) is welded to the frame The frame (6) is provided with a hydraulic cylinder (14) at the other end of the mounting frame (11), and two hydraulic cylinders (14) are provided and symmetrically fixedly connected to the mounting frame (11), the output ends of the two hydraulic cylinders (14) are respectively directed toward the two wheels of the wheelset (1), the protective mechanism (12) is fixedly connected to the output ends of the hydraulic cylinders (14), the wheel frame (13) is fixedly connected to one end of the protective mechanism (12) away from the hydraulic cylinders (14), the friction wheel (10) is mounted in the wheel frame (13), and the friction wheel (10) is rotatably connected to the wheel frame (13) through a rotating shaft, the surface of the friction wheel (10) contacts the side of the wheel, the generator (9) is fixedly connected to the surface of the wheel frame (13), and the input shaft of the generator (9) is connected to the rotating shaft of the friction wheel (10) through a coupling.

2. The subway kinetic energy recovery and conversion device according to claim 1, characterized in that: The protection mechanism (12) is composed of a sleeve (15), a protection spring (16) and a sliding rod (17), wherein the sleeve (15) is fixedly connected to the hydraulic cylinder (14), the protection spring (16) is arranged in the sleeve (15), and one end of the protection spring (16) is fixedly connected to the sleeve (15), the sliding rod (17) is arranged in the sleeve (15) and is slidably connected to the inner wall of the sleeve (15), and the other end of the protection spring (16) is fixedly connected to the sliding rod (17), the end of the sliding rod (17) facing the wheel passes through the sleeve (15), and the end of the sliding rod (17) facing the wheel is fixedly connected to the wheel frame (13).

3. The subway kinetic energy recovery and conversion device according to claim 2, characterized in that: The surface of the friction wheel (10) is wrapped with rubber having a high friction coefficient.

4. The subway kinetic energy recovery and conversion device according to claim 2, characterized in that: A displacement sensor (18) is fixedly connected to one end of the inner wall of the sleeve (15) away from the sliding rod (17), and the displacement sensor (18) detects the displacement of the sliding rod (17).

5. The subway kinetic energy recovery and conversion device according to claim 1, characterized in that: The electric energy generated by the generator (9) is fed back to the subway's power supply network through the train's inverter and pantograph.

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