CN109600020B

CN109600020B - Current transformer

Info

Publication number: CN109600020B
Application number: CN201710912141.4A
Authority: CN
Inventors: 刘海涛; 李华; 石东山; 吴刚; 唐雄辉; 刘永江; 刘大; 孙亚运; 陈锦; 李昆玉; 罗荣争; 钟林成
Original assignee: Zhuzhou CRRC Times Electric Co Ltd
Current assignee: Zhuzhou CRRC Times Electric Co Ltd
Priority date: 2017-09-29
Filing date: 2017-09-29
Publication date: 2021-01-29
Anticipated expiration: 2037-09-29
Also published as: CN109600020A

Abstract

The invention discloses a converter, which comprises a first cabinet body and a second cabinet body which are arranged in a carriage, wherein a traction converter is arranged in the first cabinet body, an auxiliary converter and a cooling system are integrally arranged in the second cabinet body, a maintenance space is arranged between the first cabinet body and the second cabinet body, an air inlet and an air outlet of an air channel of the cooling system of the second cabinet body are both positioned on the side surface of the second cabinet body, and the air inlet or/and the air outlet are/is provided with a silencing device; and sound absorption layers are laid on the cabinet plates of the second cabinet body. The converter has the advantages of simple structure, compact and reasonable layout, low noise, good damping effect and the like.

Description

Current transformer

Technical Field

The invention mainly relates to the technical field of rail transit converters, in particular to a converter.

Background

At present, in most rail transit vehicles, converter equipment is arranged at the bottom of a vehicle body or in a locomotive mechanical room and is separated from a carriage where passengers are located. With the development of the rail transit vehicle technology and the soundness of a system, part of converter equipment needs to be installed inside a carriage, and because the distance between the converter installed inside the carriage and passengers is very close, the comfort level of the passengers is directly influenced by vibration noise generated by the converter, and meanwhile, the requirements on the size and the maintenance space of the converter are smaller.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the converter which is simple in structure, reasonable in layout and low in noise and is arranged in a carriage.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a converter comprises a first cabinet body and a second cabinet body which are arranged inside a carriage, wherein a traction converter is arranged in the first cabinet body, an auxiliary converter and a cooling system are integrally arranged in the second cabinet body, a maintenance space is arranged between the first cabinet body and the second cabinet body, an air inlet and an air outlet of an air channel of the cooling system of the second cabinet body are both positioned on the side surface of the second cabinet body, and a silencer is arranged at the air inlet or/and the air outlet; and sound absorption layers are laid on the cabinet plates of the second cabinet body.

As a further improvement of the above technical solution:

and sound absorption layers are laid on the side walls of the heat dissipation air ducts in the second cabinet body.

The power module of converter arranges that first cavity and second cavity's middle part is between interval, the support capacitance of converter arranges that the upper portion of first cavity and second cavity is between interval, the input/output wiring of converter is arranged in the lower part interval of first cavity.

And the auxiliary inversion module of the converter is arranged in the upper interval of the second cavity, and the resonant capacitor of the converter is arranged in the lower interval of the second cavity.

The internal circulation cooling device of the converter is arranged in the middle section of the third cavity, the control unit of the converter is arranged in the upper section of the third cavity, and the contactor and the water pump of the converter are arranged in the lower section of the third cavity.

And a heat exchanger, a cooling fan, an auxiliary transformer, a secondary filter reactor, a chopper resistor and an expansion water tank are arranged in the second cabinet body.

The heat exchanger and the cooling fan are arranged at the upper part of the second cabinet body; the heat exchanger is arranged at the air inlet of the cooling fan.

The auxiliary transformer and the secondary filter reactor are arranged in the middle of the second cabinet body; the chopper resistor is arranged below the secondary filter reactor; the expansion water tank is arranged on one side of the upper part of the second cabinet body.

An in-storage charging unit is arranged in the second cabinet body.

The bottom and the top of the first cabinet body and the second cabinet body are both provided with shock pads.

Compared with the prior art, the invention has the advantages that:

the converter is arranged in a carriage of the motor train unit, a traction converter and an auxiliary cooling system are adopted for carrying out double-cabinet discrete layout, and a power module and a cooling unit are respectively arranged; the structure has compact and reasonable layout and good symmetry, and the middle space can be used as a maintenance space, thereby not only reserving more seat spaces for passengers, but also being beneficial to uniformly distributing the weight of the whole vehicle; the noise of the converter is greatly reduced through the layout of the sound absorption layer, the development of the air outlet silencing device and the like.

Drawings

Fig. 1 is a main circuit diagram of a traction converter according to the invention.

Fig. 2 is a main circuit structure diagram in the second cabinet of the present invention.

Fig. 3 is a schematic perspective view of the present invention.

Fig. 4 is a front view structural schematic diagram of the first cabinet in the invention.

Fig. 5 is a side view of the first cabinet of the present invention.

Fig. 6 is a rear view structural schematic diagram of the first cabinet in the present invention.

Fig. 7 is a front view structural schematic diagram of the second cabinet in the invention.

Fig. 8 is a rear view structural schematic diagram of the second cabinet in the invention.

Fig. 9 is a schematic view of an air duct structure of the second cabinet in the present invention.

Fig. 10 is a structural layout view of the sound-absorbing cotton in the second cabinet according to the present invention.

Fig. 11 is a schematic circuit diagram of the in-bank charging unit of the present invention.

FIG. 12 is a schematic diagram of the auxiliary system ground detection in the present invention.

The reference numbers in the figures illustrate: 1. a first cabinet; 101. a first cavity; 102. a second cavity; 103. a third cavity; 2. a second cabinet; 3. a support capacitor; 4. a power module; 5. an input/output line bank; 6. an auxiliary inversion module; 7. a resonant capacitor; 8. a control unit; 9. an internal circulation cooling device; 10. a contactor; 11. a water pump; 12. a low inductance busbar; 13. a heat exchanger; 14. a cooling fan; 15. an auxiliary transformer; 16. a secondary filter reactor; 17. a chopper resistor; 18. an expansion tank; 19. an in-house charging unit; 20. a silencer device; 21. and a sound absorbing layer.

Detailed Description

The invention is further described below with reference to the figures and the specific embodiments of the description.

As shown in fig. 1 to 12, the converter of the present embodiment includes a traction power supply unit composed of a double four-quadrant PWM rectifier and inverter and an auxiliary equipment power supply unit composed of an auxiliary inverter, and the two rectifiers, the two inverters and the auxiliary inverter share a dc loop. In addition, the secondary resonant circuit is included, so that higher harmonics can be eliminated, and the stability of the intermediate direct-current voltage is high. The intelligent cabinet comprises a first cabinet body 1 and a second cabinet body 2 which are arranged on the inner end face of a carriage, wherein the first cabinet body 1 is connected with the second cabinet body 2 through a cable and a water pipe; a traction converter is installed in the first cabinet body 1, an auxiliary converter and a cooling system are integrally installed in the second cabinet body 2, a maintenance space is arranged between the first cabinet body 1 and the second cabinet body 2, and an air inlet and an air outlet of an air channel of the cooling system of the second cabinet body 2 are both positioned on the side surface of the second cabinet body 2, so that the phenomenon that the noise of a wheel hub is directly transmitted into a vehicle is avoided, as shown in fig. 9; because the lower part of the installation position of the converter is directly opposite to the hub, the noise energy of the hub is far higher than that of a fan in the second cabinet body 2, if a traditional side-in and side-out structure of a locomotive is adopted, noise reduction measures of the second cabinet body 2 cannot be blocked, and the noise of the hub transmitted by an air outlet in high-speed operation is very large; the air inlet or/and the air outlet is/are provided with a silencing device 20, so that the noise of the air inlet or/and the air outlet is further reduced; the cabinet plate of the second cabinet body 2 is paved with sound absorption layers 21. The converter is arranged in a carriage of the motor train unit, a traction converter and an auxiliary cooling system are adopted for carrying out double-cabinet discrete layout, and a power module 4 and the cooling system are respectively arranged; the structure layout is compact and reasonable, the symmetry is good, and the middle space can be used as a maintenance space, so that more seat spaces can be reserved for passengers, and the uniform distribution of the weight of the whole vehicle is facilitated; the noise of the converter is greatly reduced through the layout of the sound absorption layer 21, the development of the air outlet silencing device and the like.

In this embodiment, the side walls of the heat dissipation air duct inside the second cabinet 2 are all laid with sound absorption layers 21 (such as sound absorption cotton). As shown in figure 10, the sound-absorbing cotton is adhered to each inner wall of the cabinet body by glue, the sound-absorbing cotton has good sound-absorbing effect, the average sound-absorbing rate of 500 Hz-8000 Hz reaches more than 80%, the sound-absorbing cotton has different thicknesses in size, and the sound-absorbing cotton can be flexibly used. Inhale sound cotton according to structural design overall arrangement, different cavitys adopt different thickness. Through practical tests, the sound-absorbing cotton adhered to the single air channel can be reduced by 10dB (A) compared with the sound-absorbing cotton not adhered.

As shown in fig. 4 to 6, in the present embodiment, the traction converter includes four power modules 4 for rectification and inversion, one auxiliary inversion module 6, four support capacitors 3 and four resonance capacitors 7, one control unit 8, and one internal circulation cooling device 9, and further, a set of water pumps 11 of a water cooling system and related pipelines are integrated. Specifically, the first cabinet body 1 is internally divided into three first cavity 101, second cavity 102 and third cavity 103 which are arranged side by side, the first cavity 101, the second cavity 102 and the third cavity 103 are distributed in three intervals from top to bottom, the power module 4 is arranged in the middle of the first cavity 101 and the second cavity 102, the support capacitor 3 is arranged in the upper interval of the first cavity 101 and the second cavity 102, and the input and output wiring bank 5 is arranged in the lower interval of the first cavity 101. The auxiliary inverter module 6 is installed in an upper section of the second cavity 102, and the resonant capacitor 7 is installed in a lower section of the second cavity 102. The internal circulation cooling device 9 is arranged in the middle section of the third cavity 103, the control unit 8 of the converter is arranged in the upper section of the third cavity 103, and the contactor 10 and the water pump 11 of the converter are arranged in the lower section of the third cavity 103; at the back of the first cabinet body 1, the power modules 4 are connected through the low-inductance busbar 12, and the structural layout is compact and reasonable.

In this embodiment, a heat exchanger 13, a cooling fan 14, an auxiliary transformer 15, a secondary filter reactor 16, a chopper resistor 17 and an expansion water tank 18 are installed in the second cabinet body 2, and a set of auxiliary AC380V output electrical devices is integrated; compared with the mode that the auxiliary converter and the cooling system independently adopt the cabinet body, the second cabinet body 2 is smaller in size and saves the space and the weight of the whole vehicle.

In this embodiment, the heat exchanger 13 and the cooling fan 14 are mounted on the upper portion of the second cabinet 2; the heat exchanger 13 is installed at an air inlet of the cooling fan 14.

In this embodiment, the auxiliary transformer 15 and the secondary filter reactor 16 are installed in the middle of the second cabinet 2; the chopper resistor 17 is installed below the secondary filter reactor 16; the expansion tank 18 is installed at one side of the upper portion of the second cabinet 2.

In this embodiment, the second cabinet 2 is provided with an in-warehouse charging unit 19, which ensures that the charger and other auxiliary systems can be powered by an external power supply when no control power is supplied to the train in the warehouse. As shown in fig. 11, JS is a phase-sequence relay, K1 is the auxiliary output contactor 10, and KS is the in-bay charging contactor. K1, KS realize the interlocking, JS judges the interior power phase sequence of storehouse or with after the phase lack, if K1 disconnection, then KS automatic actuation, KS coil drive voltage provides for the interior power of storehouse, like this, can judge the interior power phase sequence of storehouse in order to confirm whether can close KS through JS to need not to give the control electricity again. 380V power supplies to the auxiliary transformer 380V output bus after JS and KS in the garage, so that auxiliary power is provided for the train, and overhaul and maintenance in the train garage are facilitated.

As shown in fig. 12, in this embodiment, a converter auxiliary system ground detection circuit is further provided, so as to improve the reliability and safety of the auxiliary system operation. If one phase of the three-phase system is grounded, the grounding voltage of the three-phase output midpoint of the auxiliary power supply is detected through resistors R11-R14 on a grounding detection circuit board and a voltage sensor VH5 (installed in a traction converter) to be used as an auxiliary system grounding detection signal.

In this embodiment, the bottom and the top of first cabinet body 1 and the second cabinet body 2 all are provided with the shock pad, through shock pad and automobile body coupling, the shock pad matches with the converter through calculation such as professional weight, vibration isolation frequency, can effectively reduce the converter and transmit the vibration volume on carriage floor, improves passenger's comfort level.

In this embodiment, an interlocking device is additionally installed on the design of the door cover plate of each cabinet body, and belongs to a loop in a train high-voltage safety interlocking control system. Only after the high-voltage system cuts off the power supply, the cabinet door of the traction converter can be opened, the safety of field operators is effectively guaranteed, and the interlocking device has waterproofness.

The invention discloses a current transformer installed in a train carriage, which can effectively solve the problems of small installation and maintenance space, strict requirements on vibration noise and the like in the train carriage. The converter integrates traction and auxiliary conversion functions, increases new functions of ground protection of an auxiliary system and charging in a warehouse, adopts a two-cabinet discrete layout of a traction converter and an auxiliary cooling system, respectively arranges a power module 4 and the cooling system, and adopts a middle corridor as a maintenance space. In the design process, the noise of the converter is reduced through the layout design of sound-absorbing cotton, the development of a low-noise fan and the development of an air outlet noise eliminator; finally, the ventilation and heat dissipation requirements are met and the air duct is shaped through comparison of fluid simulation, multiple air duct designs and multiple wind shield designs; the transformer, the heat exchanger water pipe interface and the movable wind shield are convenient to install through the flexible design of the movable partition plate, the movable air inlet duct and the riveting cover plate; by the compact design of the junction box and the epoxy wiring row, wires are fed and discharged in a smaller air duct at the bottom of the transformer and are sealed; through reasonable structural design, the installation strength of devices with heavy mass such as the auxiliary transformer 15, the secondary filter reactor 16 and the like is met.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.

Claims

1. A converter is arranged in a carriage and is characterized by comprising a first cabinet body (1) and a second cabinet body (2) which are arranged in the carriage, wherein a traction converter is arranged in the first cabinet body (1), an auxiliary converter and a cooling system are integrally arranged in the second cabinet body (2), a maintenance space is arranged between the first cabinet body (1) and the second cabinet body (2), an air inlet and an air outlet of an air channel of the cooling system of the second cabinet body (2) are both positioned on the side surface of the second cabinet body (2), and a silencing device (20) is arranged at the air inlet or/and the air outlet; sound absorption layers (21) are paved on cabinet plates of the second cabinet body (2);

the power module (4) of the converter is provided with a middle section of the first cavity (101) and a middle section of the second cavity (102), a supporting capacitor (3) of the converter is arranged in an upper section of the first cavity (101) and the second cavity (102), and an input and output wiring bar (5) of the converter is arranged in a lower section of the first cavity (101);

the maintenance space is used for reserving more seat spaces for passengers and facilitating the uniform weight distribution of the whole vehicle.

2. The converter according to claim 1, characterized in that the side walls of the heat dissipation duct in the second cabinet (2) are each provided with a sound absorption layer (21).

3. The converter according to claim 1, characterized in that the auxiliary inverter module (6) of the converter is mounted in the upper region of the second cavity (102) and the resonant capacitor (7) of the converter is mounted in the lower region of the second cavity (102).

4. The converter according to claim 1, characterized in that the internal circulation cooling device (9) of the converter is installed in the middle section of the third cavity (103), the control unit (8) of the converter is installed in the upper section of the third cavity (103), and the contactor (10) and the water pump (11) of the converter are installed in the lower section of the third cavity (103).

5. The converter according to claim 1 or 2, characterized in that a heat exchanger (13), a cooling fan (14), an auxiliary transformer (15), a secondary filter reactor (16), a chopper resistor (17) and an expansion tank (18) are mounted in the second cabinet (2).

6. The converter according to claim 5, characterized in that said heat exchanger (13) and cooling fan (14) are mounted in the upper part of the second cabinet (2); the heat exchanger (13) is arranged at an air inlet of the cooling fan (14).

7. The converter according to claim 5, characterized in that the auxiliary transformer (15) and the secondary filter reactor (16) are mounted in the middle of the second tank (2); the chopper resistor (17) is arranged below the secondary filter reactor (16); the expansion water tank (18) is arranged on one side of the upper part of the second cabinet body (2).

8. The converter according to claim 5, characterized in that an in-house charging unit (19) is arranged inside the second cabinet body (2).

9. The converter according to claim 1 or 2, characterized in that the bottom and the top of the first (1) and second (2) cabinet are provided with shock absorbing pads.