Brake resistance box for urban rail vehicle

Abstract

The utility model provides a brake resistance box for urban rail vehicles, which comprises a resistance box and a resistor, the two sides of the resistor are embedded with power connection plates, the outer side of the resistor is equidistantly and fixedly wound with resistance coils, the resistance coils are coated with insulating layers, and the insulating layers are arranged on the outer side of the resistor. Standby resistance coils coated by insulating layers fixedly surround the inner side of the resistor at equal intervals, and the standby resistance coils and the resistance coils are electrically connected with the power connection plate on one side. When the resistance coil is damaged due to dust covering or sundry collision, the electromagnet in the fixing block is powered off and loses the magnetic attraction effect on the power connection piece, under the gravity effect of the power connection piece, the connecting shaft drives the power connection piece to rotate, under the blocking effect of the inclined plate, the power connection piece is electrically connected with the standby resistance coil, and the standby resistance coil is put into work. Therefore, high-load operation of other resistors when the resistance coil cannot be used is avoided, and continuous and stable operation of the brake resistance box is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of resistor equipment technology, specifically a braking resistor box for urban rail vehicles. Background Technology

[0002] When urban rail vehicles need to decelerate or stop during operation, the motor switches from driving mode to generating mode, converting the vehicle's kinetic energy into electrical energy. The braking resistor box is responsible for consuming the electrical energy generated by the motor. If the electrical energy generated during braking is not consumed, it may be fed back into the electrical system, causing the motor, frequency converter, and other electrical equipment to be subjected to excessively high voltage and current. This could lead to the motor overheating or even burning out, affecting the service life and reliability of the equipment.

[0003] Since braking resistor boxes are usually mounted on the bottom of urban rail vehicles, and heat dissipation vents are typically provided to dissipate the heat generated by the electrical energy consumed by the resistors, the complex ground environment during urban rail operation means that dust or debris can easily be carried up from the ground and enter the heat dissipation vents during the journey of the preceding carriages. The heat generated by the resistors consuming electrical energy and the electrostatic effect cause dust to adhere to and be absorbed on the outside of the resistor coils, reducing the heat dissipation efficiency of the resistor coils, increasing the load on the electrical energy consumed by the resistor coils, and reducing the overall performance and lifespan of the braking resistor box. Furthermore, when some debris enters the braking resistor box through the heat dissipation vents, due to the high speed of the vehicle, the debris may collide with the resistor coils under the action of high-speed airflow, causing mechanical damage to the resistor coils, or even causing short circuits, thereby affecting the stability and safety of the braking system.

[0004] Therefore, we provide a braking resistor box for urban rail vehicles. Utility Model Content

[0005] The main objective of this invention is to provide a braking resistor box for urban rail vehicles, which can effectively solve the problems mentioned in the background art, such as dust or debris being carried up from the ground and into the heat dissipation vent during the movement of the front carriage, which leads to a decrease in the heat dissipation efficiency of the resistor coil and an increase in the load on the electrical energy consumed by the resistor coil. At the same time, debris may collide with the resistor coil under the action of high-speed airflow, causing mechanical damage to the resistor coil.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A braking resistor box for urban rail vehicles includes a resistor box and a resistor. A grounding plate is nested on both sides of the resistor. A resistance coil is fixedly and equidistantly around the outside of the resistor, and the resistance coil is covered with an insulating layer. A spare resistance coil, covered by the insulating layer, is fixedly and equidistantly around the inside of the resistor. Both the spare resistance coil and the resistance coil are electrically connected to the grounding plate on one side. A connecting shaft is located below the grounding plate on the other side, and the connecting shaft is movably and fitted inside the resistor. A grounding plate is fixedly installed on the outside of the connecting shaft, and the grounding plate is electrically connected to the resistance coil and the grounding plate on the other side. An inclined plate is located below the connecting shaft on the resistor. A fixing block is fixedly installed on the other side of the resistance coil, and an electromagnet electrically connected to the resistance coil is embedded in the fixing block. The electromagnet is magnetically attracted to the grounding plate.

[0008] In the above scheme, preferably, mounting brackets for fixing the resistor box to the bottom of the vehicle are fixedly installed on both sides of the upper part, and heat dissipation vents for heat dissipation are provided on the outer side of the resistor box.

[0009] In the above scheme, preferably, a circuit breaker base is fixedly installed on one side of the inside of the resistor box, and an air switch is fixedly installed on the circuit breaker base. One side of the air switch is electrically connected to the drive motor of the urban rail vehicle.

[0010] In the above scheme, preferably, a rectifier is fixedly installed on one side of the resistor box, and a cable is electrically connected between the air switch and the rectifier.

[0011] In the above scheme, preferably, the two sides of the rectifier are electrically connected to an output cable and a return cable, respectively. The terminal block on one side is electrically connected to the output cable, and the terminal block on the other side is electrically connected to the return cable. A battery fixedly installed inside the resistor box on the other side is electrically connected to the return cable.

[0012] In the above scheme, preferably, a cooling fan for heat dissipation is fixedly installed in the middle of the inside of the resistor box, and the cooling fan is electrically connected to the battery.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The braking resistor box for urban rail vehicles is equipped with a connecting shaft, a contact plate, and a spare resistor coil. When the resistor coil is damaged by dust or debris, the electromagnet in the fixing block is de-energized and loses its magnetic attraction to the contact plate. Under the gravity of the contact plate, the connecting shaft drives the contact plate to rotate. Under the obstruction of the inclined plate, the contact plate is electrically connected to the spare resistor coil, and the spare resistor coil is put into operation. This avoids other resistors from operating under high load when the resistor coil cannot be used, and ensures the continuous and stable operation of the braking resistor box.

[0015] (2) The braking resistor box for urban rail vehicles is equipped with a battery and a cooling fan. When the resistor coil generates heat during operation, it is discharged outside the box through the heat dissipation vent. Cold air is supplied from other locations to form natural convection cooling. The cooling fan is electrically connected to the battery. When working, the cooling fan runs to accelerate the airflow speed, enhance the heat dissipation effect, reduce the temperature inside the resistor box, and prevent the resistor coil from degrading due to overheating. After the electrical energy is consumed through the resistor coil, a small amount of current flows out from the other side of the terminal board and returns to the rectifier through the return cable. Part of the current charges the battery and stores the excess electrical energy for use by the cooling fan. The other part of the current continues to participate in the circuit circulation to avoid the resistor coil from working under high load with high current under braking. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the resistor box in this utility model.

[0019] Figure 3 This is a schematic diagram of the connection structure between the output cable and the return cable in this utility model.

[0020] Figure 4 This is a partial structural diagram of the resistor in this utility model.

[0021] Figure 5 This is a schematic diagram of the connection structure between the junction plate and the resistor coil in this utility model.

[0022] Figure 6 This is a schematic diagram of the connection structure between the junction plate and the spare resistor coil in this utility model.

[0023] Figure 7 This utility model Figure 4 A magnified view of the local structure at point A in the middle.

[0024] Figure 8 This utility model Figure 6 A magnified view of the local structure at point B.

[0025] Figure 1 - Figure 8 Components: 1. Resistor box; 101. Heat sink; 2. Mounting bracket; 3. Cooling fan; 4. Circuit breaker base; 5. Air switch; 6. Cable; 7. Rectifier; 8. Output cable; 9. Resistor; 901. Connecting plate; 902. Resistor coil; 9021. Fixing block; 9022. Electromagnet; 903. Connecting shaft; 904. Connecting piece; 905. Spare resistor coil; 906. Inclined plate; 10. Return cable; 11. Battery. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] like Figure 1 - Figure 8 As shown in this embodiment, a braking resistor box for urban rail vehicles includes a resistor box 1 and a resistor 9. A grounding plate 901 is nested on both sides of the resistor 9. A resistance coil 902 is fixedly and equidistantly around the outer side of the resistor 9, and the resistance coil 902 is covered with an insulating layer. A spare resistance coil 905, covered by an insulating layer, is fixedly and equidistantly around the inner side of the resistor 9. Both the spare resistance coil 905 and the resistance coil 902 are electrically connected to the grounding plate 901 on one side. A connecting shaft 903 is provided below the grounding plate 901 on the other side. The connecting shaft 903 is movably fitted inside the resistor 9. A contact piece 904 is fixedly installed on the outside of the connecting shaft 903. The contact piece 904 is electrically connected to the resistor coil 902 and the contact plate 901 on the other side. An inclined plate 906 is located on the resistor 9 below the connecting shaft 903. A fixing block 9021 is fixedly installed on the other side of the resistor coil 902. An electromagnet 9022 electrically connected to the resistor coil 902 is fitted inside the fixing block 9021. The electromagnet 9022 is magnetically attracted to the contact piece 904.

[0028] Specifically, with this configuration, since the resistor 9 is nested on both sides with a connecting plate 901, the outer side is surrounded by a resistance coil 902 and the inner side is surrounded by a spare resistance coil 905, and both are connected to one side of the connecting plate 901, during normal operation, the current flows into the resistance coil 902 through the connecting plate 901 and the connecting piece 904, converting electrical energy into heat energy for consumption. When the resistance coil 902 is damaged due to dust or impact from debris, the electromagnet 9022 in the fixing block 9021 is de-energized, losing its magnetic attraction to the connecting piece 904. Under the gravity of the connecting piece 904, the connecting shaft 903 drives the connecting piece 904 to rotate, and under the obstruction of the inclined plate 906, the connecting piece 904 is electrically connected to the spare resistance coil 905, and the spare resistance coil 905 is put into operation, so as to avoid other resistors 9 operating under high load when the resistance coil 902 cannot be used, and ensure the continuous and stable operation of the braking resistor box 1.

[0029] like Figure 1 - Figure 8 As shown, in this embodiment, mounting brackets 2 for fixing the resistor box 1 to the bottom of the vehicle are fixedly installed on both sides of the upper part of the resistor box 1, and heat dissipation vents 101 for heat dissipation are provided on the outer side of the resistor box 1. A heat dissipation fan 3 for heat dissipation is fixedly installed in the middle of the inside of the resistor box 1, and the heat dissipation fan 3 is electrically connected to the battery 11.

[0030] Specifically, with this setup, during use, the mounting brackets 2 on both sides above the resistor box 1 are used to securely install the resistor box 1 at the bottom of the urban rail vehicle, and the heat dissipation vent 101 provides a heat dissipation channel. When the resistor coil 902 generates heat during operation, it is discharged outside the box through the heat dissipation vent 101, and cool air is replenished from other locations to form natural convection cooling. The cooling fan 3 is electrically connected to the battery 11. During operation, the cooling fan 3 runs to accelerate the airflow speed, enhance the heat dissipation effect, reduce the temperature inside the resistor box 1, and prevent the resistor coil 902 from degrading due to overheating.

[0031] like Figure 1 - Figure 8 As shown, in this embodiment, an air switch base 4 is fixedly installed on one side of the inside of the resistor box 1, and an air switch 5 is fixedly installed on the air switch base 4. One side of the air switch 5 is electrically connected to the urban rail vehicle drive motor, and a rectifier 7 is fixedly installed on the other side. A cable 6 is electrically connected between the air switch 5 and the rectifier 7. An output cable 8 and a return cable 10 are electrically connected to both sides of the rectifier 7, respectively. A circuit board 901 on one side is electrically connected to the output cable 8, and a circuit board 901 on the other side is electrically connected to the return cable 10. A battery 11 fixedly installed on the other side of the inside of the resistor box 1 is electrically connected to the return cable 10.

[0032] Specifically, with this configuration, the air switch 5 is installed on the air switch base 4 and connected to the urban rail vehicle drive motor. When the drive motor is in braking mode and generating electrical energy, the air switch 5 provides protection. The current passes through the air switch 5 and is transmitted through the cable 6 to the rectifier 7 (a rectifier 7 is an electrical device that converts alternating current to direct current; it is mainly used to convert the alternating current generated by the urban rail vehicle drive motor and the current through the return cable 10 into direct current, and output it from the output cable 8, stabilizing the current direction; this is existing technology and will not be discussed further here). 7 converts the AC power generated by the drive motor into DC power, and then transmits the DC power to one side of the resistor 9's junction box 901 through the output cable 8 to power the resistor coil 902 for consumption. After the electrical energy is consumed by the resistor coil 902, a small amount of current flows out from the other side of the junction box 901 and returns to the rectifier 7 through the return cable 10. Part of the current charges the battery 11 and stores the excess electrical energy for use by the cooling fan 3. The other part of the current continues to participate in the circuit circulation to avoid the resistor coil 902 from working under high load under high current during braking.

[0033] It should be noted that when using this utility model as a braking resistor box for urban rail vehicles, the resistor box 1 is securely installed on the bottom of the urban rail vehicle via mounting brackets 2 on both sides above it, and provides a heat dissipation channel through the heat dissipation vent 101. When the resistor coil 902 generates heat during operation, the heat is discharged outside the box through the heat dissipation vent 101, while cool air enters from other positions, forming natural convection heat dissipation. The cooling fan 3 is electrically connected to the battery 11. During operation, the operation of the cooling fan 3 accelerates the airflow speed, enhances the heat dissipation effect, reduces the temperature inside the resistor box 1, and prevents the resistor coil 902 from degrading due to overheating. The air switch 5 is installed on the air switch base 4 and connected to the urban rail vehicle drive motor. When the drive motor is in braking state and generates electrical energy, the air switch 5 plays a protective role. The current passes through the air switch 5, is transmitted to the rectifier 7 via the cable 6, and the rectifier 7 converts the AC power generated by the drive motor into DC power. Then, the DC power is transmitted to the side terminal board 901 of the resistor 9 via the output cable 8 to supply power to the resistor coil 902 for consumption. After electrical energy is consumed by the resistor coil 902, a small amount of current flows out from the other side of the junction plate 901 and returns to the rectifier 7 via the return cable 10. Part of this current charges the battery 11, storing excess energy for the cooling fan 3; the other part continues to participate in the circuit cycle to prevent the resistor coil 902 from operating under high load due to high current during braking. Under normal operating conditions, current flows into the resistor coil 902 through the junction plate 901 and junction piece 904, converting electrical energy into heat energy. When coil 902 is damaged due to dust or impact from debris, electromagnet 9022 inside fixing block 9021 is de-energized, losing its magnetic attraction to contact plate 904. Under the gravity of contact plate 904, connecting shaft 903 drives contact plate 904 to rotate, and under the obstruction of inclined plate 906, contact plate 904 is electrically connected to spare resistor coil 905. Spare resistor coil 905 is put into operation to prevent other resistors 9 from operating under high load when resistor coil 902 is unusable, ensuring the continuous and stable operation of braking resistor box 1.

[0034] The preferred embodiments of the present invention disclosed above are merely illustrative of the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific implementations. The present invention is not limited to the above embodiments; the embodiments and descriptions in the specification are merely outlining the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A braking resistor box for a city rail vehicle, comprising a resistor box (1) and a resistor (9), characterized in that: Both sides of the resistor (9) are nested with the power connection plate (901), the outer side of the resistor (9) is fixedly surrounded by the resistance coil (902), and the resistance coil (902) is covered with an insulating layer, the inner side of the resistor (9) is fixedly surrounded by the standby resistance coil (905) covered by the insulating layer, and the standby resistance coil (905) and the resistance coil (902) are electrically connected with the power connection plate (901) on one side, the other side of the power connection plate (901) is provided with a connecting shaft (903) which is movably mounted in the resistor (9), the outer side of the connecting shaft (903) is fixedly provided with a power connection sheet (904) which is electrically connected with the resistance coil (902) and the power connection plate (901) on the other side, the lower side of the connecting shaft (903) is provided with an inclined plate (906) on the resistor (9), the other side of the resistance coil (902) is fixedly provided with a fixed block (9021), the fixed block (9021) is movably provided with an electromagnet (9022) which is electrically connected with the resistance coil (902), and the electromagnet (9022) is magnetically attracted to the power connection sheet (904).

2. The brake resistor box for a city rail vehicle according to claim 1, characterized in that, The upper sides of the resistance box (1) are fixedly provided with a mounting frame (2) for fixing the resistance box (1) to the bottom of the vehicle, and the outer sides of the resistance box (1) are provided with heat dissipation openings (101) for heat dissipation.

3. The brake resistor box for a city rail vehicle according to claim 1, characterized in that, The inside of the resistance box (1) is fixedly provided with an air switch base (4), and the air switch base (4) is fixedly provided with an air switch (5), one side of the air switch (5) is electrically connected with the urban rail vehicle drive motor.

4. The brake resistor box for a city rail vehicle according to claim 3, characterized in that, One side of the resistance box (1) is fixedly provided with a rectifier (7), and the air switch (5) and the rectifier (7) are electrically connected by a cable (6).

5. The braking resistor box for a city rail vehicle according to claim 4, characterized in that, Both sides of the rectifier (7) are respectively electrically connected with an output cable (8) and a return cable (10), one side of the power connection plate (901) is electrically connected with the output cable (8), and the other side of the power connection plate (901) is electrically connected with the return cable (10), and the return cable (10) is electrically connected with a storage battery (11) fixedly provided on the other side of the resistance box (1).

6. The brake resistor box for a city rail vehicle according to claim 1, characterized in that, The inside of the resistance box (1) is fixedly provided with a heat dissipation fan (3) for heat dissipation, and the heat dissipation fan (3) is electrically connected with the storage battery (11).

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