A subway traction inverter

Abstract

The application discloses a subway traction inverter, and relates to the field of subway power supply, which comprises a shell, an inverter module, a reactor, an output interface end for connecting a subway motor and an electrical input interface end are arranged in the shell; a fan is arranged between the inverter module and the reactor in the shell, a first air vent is arranged between the reactor and the fan, and a second air vent is arranged between the inverter module and the reactor. The application has the effect of prolonging the service life of the inverter.

Description

Technical Field

[0001] This application relates to the field of subway power supply, and in particular to a subway traction inverter. Background Technology

[0002] The main drive system of a subway consists of components such as a traction inverter, a microcomputer-controlled drive unit, and a traction motor. The control strategy of the traction inverter is one of the important components of the main drive system. Currently, subway traction inverters mainly use VVVF two-level inverters to convert high-voltage electricity from the power grid into AC power usable by the subway motors, providing traction force for the subway.

[0003] In related technologies, VVVF inverters include a magnetic ring for reducing interference from electronic equipment, an inverter module for voltage conversion, and a reactor for suppressing current surges caused by grid voltage fluctuations and operational overvoltages to protect the transformer module.

[0004] However, both the inverter module and the reactor will generate heat during operation, which will cause the overall inverter temperature to rise, accelerate the aging of the equipment, and thus affect the lifespan of the inverter. Summary of the Invention

[0005] To address the issue of equipment aging and extend the service life of inverters, this application provides a subway traction inverter.

[0006] This application provides a subway traction inverter, which adopts the following technical solution:

[0007] A subway traction inverter includes a housing, within which an inverter module, a reactor, an output interface for connecting to a subway motor, and an electrical input interface are disposed; a fan is disposed within the housing between the inverter module and the reactor, a first ventilation opening is disposed between the reactor and the fan, and a second ventilation opening is disposed between the inverter module and the reactor.

[0008] By adopting the above technical solution, and adding a fan to the inverter, the airflow generated by the fan can dissipate heat from the reactor and inverter module through the first and second ventilation ports, respectively. This reduces the temperature of the equipment, mitigates aging caused by excessive temperature, and extends the lifespan of the inverter. Placing the fan between the inverter module and the reactor further enhances the heat dissipation effect.

[0009] Optionally, the first vent, the second vent, the inverter module, and the reactor are all located on the same side inside the housing when they are connected to the electrical wires.

[0010] By adopting the technical scheme, the reactor and the inverter module are prone to generate heat in the working process of some components thereof, and the parts connected with the electric wires are also prone to generate a large amount of heat, the first vent, the second vent and the part connected with the electric wires are arranged on one side in the shell, and heat dissipation of the connection part of the electric wires is facilitated.

[0011] Optionally, a wiring frame for accommodating the electric wires is arranged in the shell, and a plurality of openings are formed in the wiring frame.

[0012] By adopting the technical scheme, the wiring frame facilitates placement of the electric wires, and the openings are arranged to allow air to pass through, thereby facilitating heat dissipation.

[0013] Optionally, a damping protection assembly is further arranged in the shell, and the damping protection assembly comprises a support base fixed to the shell, an upper support frame connected with the inverter module and a spring connected between the upper support frame and the support base.

[0014] By adopting the technical scheme, damping is achieved to protect the inverter module. One of factors causing aging of the equipment is that the inverter module is most prone to damage when the equipment is shaken, and the internal components of the inverter module are prone to damage due to excessive force when the inverter module is shaken, thereby affecting the service life of the equipment. The spring is arranged to buffer the impact force, thereby protecting the components and prolonging the service life of the equipment.

[0015] Optionally, an embedded block is fixed to the upper support frame, a limiting block is fixed to the support base, an embedded slot is formed in the limiting block to allow the embedded block to be inserted and slide, a limiting rod is slidably arranged on the limiting block, and one end of the limiting rod is inserted into the embedded slot and used to limit sliding of the embedded block relative to the embedded slot.

[0016] By adopting the technical scheme, the embedded block can move in the embedded slot, and the moving range of the embedded block determines the moving range of the upper support frame. In a normal state of the equipment, one end of the limiting rod is inserted into the embedded slot and in contact with the embedded block to limit movement of the embedded block in the embedded slot, thereby limiting movement of the upper support frame and movement of the inverter module. Since slight shaking has little effect on the components, the limiting rod limits movement of the inverter module, thereby reducing the frequency of extension and contraction of the spring, stabilizing the inverter module and prolonging the service life of the spring. Since the limiting rod is movable relative to the embedded slot, when shaking exceeds a certain degree, one end of the limiting rod moves out of the embedded slot and is separated from the embedded block, and the upper support frame can move at this time.

[0017] Optionally, the limiting rod is provided with at least two, at least one of which is used to limit the movement of the embedded block in the vertical direction, and at least one of which is used to limit the movement of the embedded block in the horizontal direction.

[0018] By adopting the above technical scheme, the limiting in the horizontal direction and the limiting in the vertical direction are combined, so that the movement of the embedded block in the horizontal and vertical directions is limited, and when the limiting rod moves out of the embedded groove, the movement of the embedded block in the horizontal and vertical directions is allowed, so that the shock absorbing effect is better.

[0019] Optionally, an inclined surface is arranged at one end of the limiting rod inserted into the embedded groove, and a cutting surface capable of contacting the inclined surface is arranged at one end of the embedded block facing the limiting block.

[0020] By adopting the above technical scheme, when the device suddenly shakes violently, the embedded block will generate a force on the limiting rod, and the inclined surface and the cutting surface are in contact, so as to facilitate the conversion of the shaking degree of the device into the power for the limiting rod to slide out of the embedded groove.

[0021] Optionally, a sliding groove for the limiting rod to slide is arranged on the limiting block, and a groove communicating with the sliding groove is arranged on the limiting block, a protruding block located in the groove is fixedly connected to the limiting rod, and the protruding block has a deformation capacity.

[0022] By adopting the above technical scheme, when the device shakes slightly, the protruding block is located in the groove, so as to limit the movement of the limiting rod, thereby stabilizing the embedded block and avoiding the limiting rod from accidentally separating from the embedded groove when the device shakes slightly. When the device shakes greatly, the force of the embedded block on the limiting rod is greater than the deformation force of the protruding block overcoming the deformation, the protruding block deforms and separates from the groove, the limiting rod moves and one end of the limiting rod separates from the embedded block, so as to realize the movement of the embedded block and the movement shock absorption of the inverter module.

[0023] Optionally, a holding extension plate is fixed to the limiting block, one end of the limiting rod passes through the holding extension plate, a limiting sheet is fixed to the limiting rod, and the limiting sheet abuts against the holding extension plate to limit the limiting rod from moving out of the sliding groove completely.

[0024] By adopting the above technical scheme, the limiting sheet and the holding extension plate limit the maximum position of the limiting rod moving out of the embedded groove, so as to avoid the limiting rod from separating from the limiting block completely. Meanwhile, after the shaking ends, the worker can also press the limiting rod into the limiting block to realize the contact between the limiting rod and the embedded block, so as to restore the state of limiting the movement of the embedded block.

[0025] In summary, the present application has the following beneficial effects:

[0026] 1. The fan is located between the reactor and the inverter module, which can better dissipate heat and cool the reactor and inverter module, thus improving the service life of the equipment;

[0027] 2. When significant vibration occurs, the shock absorption protection component can provide shock absorption protection for the inverter module. Furthermore, the limit rod is designed to separate from the embedded block only when significant vibration occurs, preventing the inverter module from shaking during minor vibrations and improving the lifespan of the spring. Attached Figure Description

[0028] Figure 1 This is a partial structural diagram of an embodiment of this application;

[0029] Figure 2 This is a cross-sectional schematic diagram of the inverter module at a certain interval in an embodiment of this application;

[0030] Figure 3 yes Figure 2 Enlarged schematic diagram;

[0031] Figure 4 This is an exploded view of a partial structure in an embodiment of this application, highlighting the cooperation between the limiting rod and the embedded block.

[0032] Reference numerals: 1. Housing; 2. Electrical input interface terminal; 3. Output interface terminal; 4. Partition plate; 5. Reactor; 6. Fan; 7. Inverter module; 8. First vent; 9. Second vent; 10. Wiring frame; 11. Opening; 12. Vibration damping protection component; 13. Support base; 14. Upper support frame; 15. Spring; 16. Limiting block; 17. Embedded groove; 18. Embedded block; 19. Insulating rubber layer; 20. Sliding groove; 21. Limiting rod; 22. Inclined surface; 23. Cut surface; 24. Groove; 25. Protrusion; 26. Grip extension plate; 27. Limiting piece. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0034] This application discloses a subway traction inverter, referring to... Figure 1 It includes a housing 1, an electrical input interface 2 for electrical input, and an output interface 3 for connecting to a subway motor.

[0035] Reference Figure 1The shell 1 is fixedly connected with a plurality of partitions 4, and the plurality of partitions 4 divide the shell 1 into a plurality of intervals so as to place and fix different electrical elements in different intervals. The shell 1 is further provided with an electric reactor 5, a fan 6 and an inverter module 7 located in different intervals. The fan 6 is located between the electric reactor 5 and the inverter module 7. A first air vent 8 on the partition 4 is arranged between the electric reactor 5 and the fan 6, and a second air vent 9 on the partition 4 is arranged between the inverter module 7 and the electric reactor 5. The fan 6 is arranged between the inverter module 7 and the electric reactor 5, and the wind power generated by the fan 6 can be used to cool the electric reactor 5 and the inverter module 7 through the first air vent 8 and the second air vent 9, respectively, thereby reducing the temperature of the equipment, improving the aging degree caused by high temperature, and prolonging the service life of the inverter.

[0036] With reference to Figure 1 , the first air vent 8 and the second air vent 9 are located on the same side of the shell 1, and the wiring ports of the inverter module 7 and the electric reactor 5 for connecting the electric wires are located on the same side of the first air vent 8, so that the wind power generated by the fan 6 can directly cool the wiring ports of the electric wires. In addition, the electric wires can pass through the first air vent 8 and the second air vent 9, thereby realizing the electrical connection of the electrical elements in the plurality of intervals.

[0037] With reference to Figure 1 , a wiring frame 10 is fixedly connected to the shell 1 near the inverter module 7 by screws, and the wiring frame 10 is located on the same side of the second air vent 9 in the shell 1. The wiring frame 10 has the function of placing the electric wires, and a plurality of holes 11 are formed in the wiring frame 10 to allow air to pass through, thereby facilitating heat dissipation of the electric wires.

[0038] With reference to Figure 2 , a damping protection assembly 12 is further arranged between the shell 1 and the inverter module 7 to achieve a damping effect. The damping protection assembly 12 includes a support base 13 fixed in the shell 1, an upper support frame 14 for connecting the inverter module 7, and a spring 15 connected between the upper support frame 14 and the support base 13. The spring 15 is arranged in multiple in the length and width directions in the horizontal direction. The support base 13 is welded and fixed to the shell 1, and in other embodiments, the support base 13 can be fixed by bolts.

[0039] With reference to Figure 2 , Figure 3The support base 13 is integrally formed with a limiting block 16 arranged in the vertical direction, and the limiting block 16 is recessed in the direction away from the upper support frame 14 to form an embedding groove 17 on the side of the upper support frame 14. The embedding groove 17 is fixed with an embedding block 18 embedded therein, and the groove wall profile of the embedding groove 17 is larger than the outer profile of the embedding block 18. The size of the gap between the embedding groove 17 and the embedding block 18 determines the movable range of the upper support frame 14. Since the maximum number of components in the inverter module 7, when the vibration occurs, the components in the inverter module 7 are easily damaged due to excessive force, thereby affecting the service life of the equipment. Through the setting of the shock protection assembly 12, the received impact force can be buffered, thereby protecting the components and improving the service life of the inverter module 7. It should be noted that an insulating rubber layer 19 is arranged between the side wall of the limiting block 16 and the upper support frame 14. The insulating rubber layer 19 is fixed on the limiting block 16 and is compressed by the upper support frame 14 and the limiting block 16. When the upper support frame 14 wants to move, the insulating rubber layer 19 has the effect of providing damping, thereby achieving the purpose of shock absorption.

[0040] With reference to Figure 2 , Figure 3 The limiting block 16 is provided with a sliding groove 20 communicating with the embedding groove 17, and the limiting block 16 is slidingly provided with a limiting rod 21 penetrating through the sliding groove 20. One end of the limiting rod 21 is inserted into the embedding groove 17 and used to limit the sliding of the embedding block 18 relative to the embedding groove 17.

[0041] With reference to Figure 3 , Figure 4 The limiting rod 21 is provided with two limiting rods 21. One limiting rod 21 can abut against one side wall of the embedding block 18 in the vertical direction to limit the movement of the embedding block 18 in the vertical direction. The other limiting rod 21 can abut against one side wall of the embedding block 18 in the horizontal direction to limit the movement of the embedding block 18 in the horizontal direction. In the normal state of the equipment, since one end of the limiting rod 21 is inserted into the embedding groove 17 and in contact with the embedding block 18 to limit the movement of the embedding block 18 in the embedding groove 17, the movement of the upper support frame 14 is limited, and the movement of the inverter module 7 is limited. Since slight vibration has little effect on the components, after the movement of the inverter module 7 is limited by the limiting rod 21, the frequency of the extension and contraction of the spring 15 is reduced, which has the effect of stabilizing the inverter module 7 and prolonging the service life of the spring 15. Since the limiting rod 21 is movable relative to the embedding groove 17, when the vibration exceeds a certain degree, one end of the limiting rod 21 will move out of the embedding groove 17 and separate from the embedding block 18, and at this time the upper support frame 14 can move. In other embodiments, the limiting rod 21 can also be provided with four limiting rods 21, i.e., one limiting rod 21 is arranged on each of the two side walls of the embedding block 18 in the vertical direction and the two side walls in the horizontal direction.

[0042] With reference toFigure 3 、 Figure 4 ,The end of the limiting rod 21 inserted into the embedded slot 17 is provided with a slope 22, and the end of the embedded block 18 towards the limiting block 16 is provided with a tangent surface 23 capable of being in surface contact with the slope 22. A groove 24 communicating with the sliding slot 20 is opened on the limiting block 16, and the limiting rod 21 is fixedly connected with a protrusion 25 located in the groove 24, and the protrusion 25 has a deformation capacity. In this application, the protrusion 25 is made of rubber material. When the device has a small amplitude of shaking, the protrusion 25 is located at the groove 24, limiting the movement of the limiting rod 21, thereby playing a role in stabilizing the embedded block 18, avoiding the accidental disengagement of the limiting rod 21 from the embedded slot 17 when the device has a small shaking. The protrusion 25 has a deformation capacity, and when the device has a larger shaking, the force of the embedded block 18 on the limiting rod 21 is greater than the deformation force of the protrusion 25 overcoming the deformation, the protrusion 25 deforms and disengages from the groove 24, the limiting rod 21 moves and the end of the limiting rod 21 separates from the embedded block 18, thereby realizing the movement of the embedded block 18, and further realizing the movement shock absorption of the inverter module 7.

[0043] Referring to Figure 3 , the limiting block 16 is fixedly provided with an L-shaped holding extension plate 26, and the end of the limiting rod 21 away from the upper support frame 14 penetrates through the holding extension plate 26. The limiting rod 21 is fixedly provided with a limiting sheet 27. When the limiting rod 21 moves away from the upper support frame 14 due to shaking, the limiting sheet 27 can abut against the holding extension plate 26 to limit the limiting rod 21 from moving completely out of the sliding slot 20. The limiting sheet 27 and the holding extension plate 26 limit the maximum position of the limiting rod 21 moving out of the embedded slot 17, avoiding the complete disengagement of the limiting rod 21 from the limiting block 16. At the same time, after the shaking ends, the staff can also extrude the limiting rod 21 into the limiting block 16 to realize the contact between the limiting rod 21 and the embedded block 18, and restore to the state of limiting the movement of the embedded block 18.

[0044] The specific working condition effect of the embodiment:

[0045] When the inverter is working, the setting of the fan 6 has a cooling effect, which alleviates the aging problem caused by too high temperature. At the same time, the shock absorption protection assembly 12 is increased, which has a buffering and shock absorption effect, alleviating the wear and aging problem of some electrical components caused by vibration. The service life of the device is improved.

[0046] The above are the preferred embodiments of the application, which do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A subway traction inverter, comprising a housing (1), wherein an inverter module (7), a reactor (5), an output interface terminal (3) for connecting to a subway motor, and an electrical input interface terminal (2) are disposed within the housing (1); characterized in that: A fan (6) is provided inside the housing (1) between the inverter module (7) and the reactor (5). A first ventilation opening (8) is provided between the reactor (5) and the fan (6), and a second ventilation opening (9) is provided between the inverter module (7) and the reactor (5). A shock-absorbing protection assembly (12) is also provided inside the housing (1). The shock-absorbing protection assembly (12) includes a support base (13) fixed to the housing (1), an upper support frame (14) for connecting the inverter module (7), and a support frame connected to the inverter module (7). A spring (15) between the upper support frame (14) and the support base (13); an embedded block (18) is fixed on the upper support frame (14), and a limiting block (16) is fixed on the support base (13). The limiting block (16) has an embedded groove (17) for the embedded block (18) to be inserted and slid; a limiting rod (21) is slidably provided on the limiting block (16), and one end of the limiting rod (21) is inserted into the embedded groove (17) and used to limit the sliding of the embedded block (18) relative to the embedded groove (17).

2. The subway traction inverter according to claim 1, characterized in that: The first vent (8), the second vent (9), the inverter module (7), and the reactor (5) are all located on the same side inside the housing (1) at the end used to connect the electrical wires.

3. The subway traction inverter according to claim 2, characterized in that: The housing (1) is provided with a wiring frame (10) for storing electrical wires, and the wiring frame (10) has multiple openings (11).

4. The subway traction inverter according to claim 1, characterized in that: At least two limiting rods (21) are provided. At least one of the limiting rods (21) is used to restrict the movement of the embedded block (18) in the vertical direction, and at least one of the limiting rods (21) is used to restrict the movement of the embedded block (18) in the horizontal direction.

5. The subway traction inverter according to claim 1, characterized in that: The end of the limiting rod (21) inserted into the embedding groove (17) is provided with a slope (22), and the end of the embedding block (18) facing the limiting block (16) is provided with a cut surface (23) that can contact the slope (22).

6. The subway traction inverter according to claim 5, characterized in that: The limiting block (16) has a sliding groove (20) for the limiting rod (21) to slide and a groove (24) communicating with the sliding groove (20). The limiting rod (21) is fixedly connected to a protrusion (25) located in the groove (24). The protrusion (25) has the ability to deform.

7. The subway traction inverter according to claim 1, characterized in that: A gripping extension plate (26) is fixed on the limiting block (16), and one end of the limiting rod (21) passes through the gripping extension plate (26). A limiting piece (27) is fixed on the limiting rod (21), and the limiting piece (27) abuts against the gripping extension plate (26) to restrict the limiting rod (21) from moving completely outside the sliding groove (20).

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