CN111356327B

CN111356327B - Current transformer

Info

Publication number: CN111356327B
Application number: CN201811567926.3A
Authority: CN
Inventors: 刘玉柱; 唐洲; 廖远辉; 李滔; 史虎; 李勇; 管仁德; 郭积晶; 廖兵
Original assignee: Zhuzhou CRRC Times Electric Co Ltd
Current assignee: Zhuzhou CRRC Times Electric Co Ltd
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2021-07-27
Anticipated expiration: 2038-12-21
Also published as: CN111356327A

Abstract

The invention provides a converter which comprises a cabinet body, a reactor, a power distribution unit and an inversion unit. The front surface of the cabinet body comprises direct current and inversion cavities arranged on two sides, and an alternating current cavity is arranged between the direct current and the inversion cavities. The reactor and the power distribution unit are arranged at the bottom of the direct current and inversion cavity, the inversion unit is positioned above the power distribution unit, and the IGBT module in the inversion unit is positioned in the alternating current cavity. The cabinet is internally provided with first independent air channels which can be respectively communicated with the direct current cavity and the inversion cavity on two sides of a position close to the top, and the cabinet is internally provided with second independent air channels which can be communicated with the alternating current cavity in the middle position close to the top. The both sides of the cabinet body are equipped with the first wind-guiding passageway that can communicate with first wind channel respectively, and cabinet body top is equipped with the second wind-guiding passageway that can communicate with the second wind channel. The converter provided by the invention has good heat dissipation characteristic, and can save cost as much as possible on the premise of reasonably meeting the use environment requirement of the converter.

Description

Current transformer

Technical Field

The invention belongs to the technical field of power electronics, and particularly relates to a converter.

Background

The converter is provided with devices which intensively generate heat, such as IGBT, reactor and the like. Therefore, the heat dissipation design of the converter is particularly important.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a current transformer with good heat dissipation property.

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

a converter comprises a cabinet body, a reactor, a power distribution unit and an inversion unit. The front surface of the cabinet body comprises direct current and inversion cavities arranged on two sides, and an alternating current cavity is arranged between the direct current and the inversion cavities. The reactor and the power distribution unit are arranged at the bottom of the direct current and inversion cavity, the inversion unit is positioned above the power distribution unit, and the IGBT module in the inversion unit is positioned in the alternating current cavity. The cabinet is internally provided with first independent air channels which can be respectively communicated with the direct current cavity and the inversion cavity on two sides of a position close to the top, and the cabinet is internally provided with second independent air channels which can be communicated with the alternating current cavity in the middle position close to the top. The both sides of the cabinet body are equipped with the first wind-guiding passageway that can communicate with first wind channel respectively, and cabinet body top is equipped with the second wind-guiding passageway that can communicate with the second wind channel.

According to the converter, for different device modules, the heat dissipation air channels with different protection grades are arranged in the cabinet body in a targeted manner through reasonable layout, so that the whole converter is divided into the heat dissipation air channels with different protection grades. The protection level of the devices arranged in the first air duct is low, and the control devices of the core are arranged in the second air duct for key protection. Therefore, the converter has good heat dissipation characteristics, and can save cost as much as possible on the premise of reasonably meeting the use environment requirements of the converter.

With respect to the above technical solution, further improvements as described below can be made.

In a preferred embodiment of the converter according to the present invention, the first filter screen is disposed on the front surface of the dc and inverter cavities, and the second filter screen is disposed on the front surface of the ac cavity.

Different protection structures are arranged aiming at different installation cavities, so that better protection effects on devices in different cavities can be ensured.

Specifically, in a preferred embodiment, the first filter screen plate comprises a heat insulation layer, an air duct partition plate and protective cotton.

Through setting up the insulating layer can play and keep apart external radiation, reduce the effect to the influence of inside device. The air duct partition plate can divide an air inlet area into different areas according to different protection grades, and different protection cottons can be installed in different areas according to the protection grades required.

In particular, in a preferred embodiment, the second filter screen panel comprises an insulation zone and a ventilation zone.

Different protection cotton can be installed by dividing different areas according to devices with different protection grade requirements through arranging the heat insulation area and the ventilation area.

Further, in a preferred embodiment, the top of the cabinet is provided with a protective assembly.

Through setting up protection component, can play key guard action to the control device of the internal core of cabinet.

Specifically, in a preferred embodiment, the guard assembly includes a filter plate, a top plate, and a side baffle. Wherein, the filter is located the upper and lower both sides face of roof, and the side baffle is located the left and right sides of roof.

The filter can ensure that the protective action to the internal device of cabinet is increased when not influencing the second wind channel radiating effect, avoids the pollution of dust and rainwater.

Specifically, in a preferred embodiment, the bottom of the top plate is provided with a middle partition plate which is arranged in bilateral symmetry so as to form a first air duct and a second air duct which are independent.

Through the arrangement form that the middle partition plate is arranged at the bottom of the top plate to form a plurality of independent air channels, the cabinet body can simplify the structure as much as possible on the premise of meeting the heat dissipation, and the production and manufacturing cost is reduced.

Further, in a preferred embodiment, two sides of the cabinet body are provided with a U-shaped air outlet cylinder which can be communicated with the first air guide channel.

The hot air in the first air channel can be guided out of the cabinet body through the U-shaped air outlet cylinder to avoid backflow.

Further, in a preferred embodiment, two U-shaped plates are symmetrically arranged on the back of the cabinet body close to the middle position.

Through setting up two "U" shaped plates, can be with the leading-in to first wind channel of the cold air from first filter plate process to the air inlet area in increase first wind channel improves the radiating effect.

Further, in a preferred embodiment, a wind box is arranged in the first wind channel, and a fan is arranged in the wind box. A fan is arranged in the second air duct.

Through the heat radiation structure who sets up bellows and fan, the radiating effect is good, simple structure, and manufacturing cost is low.

Compared with the prior art, the invention has the advantages that: the heat dissipation characteristic is good, and the cost can be saved as far as possible on the premise of reasonably meeting the requirements of the service environment of the converter.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

fig. 1 schematically shows a front structure of a current transformer of an embodiment of the present invention;

fig. 2 schematically shows a back structure of a current transformer of an embodiment of the present invention;

fig. 3 schematically shows the structure of a first filter screen panel according to an embodiment of the invention;

fig. 4 schematically shows the structure of a second screen panel according to an embodiment of the invention;

FIG. 5 schematically illustrates the overall structure of a shield assembly of an embodiment of the present invention;

FIG. 6 schematically illustrates the internal structure of a shield assembly according to an embodiment of the present invention;

fig. 7 schematically shows the internal structure of a current transformer of an embodiment of the invention;

fig. 8 schematically shows a cabinet structure of a converter of an embodiment of the present invention;

fig. 9 schematically shows the internal structure of a current transformer according to an embodiment of the present invention.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.

Fig. 1 schematically shows a front structure of a current transformer 10 according to an embodiment of the present invention. Fig. 2 schematically shows a back structure of a current transformer 10 according to an embodiment of the present invention. Fig. 3 schematically shows the structure of the first screen panel 5 according to an embodiment of the invention. Fig. 4 schematically shows the structure of the second screen plate 6 according to an embodiment of the invention. Fig. 5 schematically shows the overall structure of the shield assembly of the embodiment of the present invention. Fig. 6 schematically shows the internal structure of the shield assembly of the embodiment of the present invention. Fig. 7 schematically shows the internal structure of a current transformer according to an embodiment of the present invention. Fig. 8 schematically shows a cabinet structure of a converter according to an embodiment of the present invention. Fig. 9 schematically shows the internal structure of a current transformer according to an embodiment of the present invention.

As shown in fig. 1, 2, and 6 to 9, a converter 10 according to an embodiment of the present invention includes a cabinet 1, a reactor 2, a power distribution unit 3, and an inverter unit 4. The front side of the cabinet body 1 comprises a direct current cavity and an inversion cavity which are arranged on two sides, and an alternating current cavity is arranged between the direct current cavity and the inversion cavity. The reactor 2 and the power distribution unit 3 are both arranged at the bottom of the direct current and inversion cavity, the inversion unit 4 is positioned above the power distribution unit 3, and the IGBT module in the inversion unit 4 is positioned in the alternating current cavity. Two sides of a position close to the top in the cabinet body 1 are provided with independent first air channels 101 which can be respectively communicated with the direct current cavity and the inversion cavity, and an independent second air channel 102 which can be communicated with the alternating current cavity is arranged at a middle position close to the top in the cabinet body 1. The both sides of the cabinet body 1 are equipped with the first wind-guiding passageway that can communicate with first wind channel 101 respectively, and cabinet body 1 top is equipped with the second wind-guiding passageway that can communicate with second wind channel 102. According to the converter provided by the embodiment of the invention, devices in the cabinet body are distributed according to function division and different protection effect requirements, and for different device modules, the whole converter is divided into the heat dissipation air channels with different protection grades through reasonable distribution in the cabinet body and targeted arrangement of the heat dissipation air channels with different protection grades. The protection level of the devices arranged in the first air duct is low, and the control devices of the core are arranged in the second air duct for key protection. Therefore, the converter has good heat dissipation characteristics, and can save cost as much as possible on the premise of reasonably meeting the use environment requirements of the converter. In particular, the power distribution unit 3 is mainly used for distribution and convergence of dc incoming lines. The inversion unit 4 is provided with different modules according to the power of the whole machine. The bottom of the cabinet body 1 is provided with the reactor 2 with larger weight, and the reactor 2 is symmetrically arranged on two sides of the cabinet body, so that the structural stability of the whole converter is facilitated.

As shown in fig. 1 and fig. 2, in the present embodiment, preferably, the front and the back of the direct current and inversion cavities are provided with first filter screen plates 5 which are uniformly arranged, and the front of the alternating current cavity is provided with second filter screen plates 6. Different protection structures are arranged aiming at different installation cavities, so that better protection effects on devices in different cavities can be ensured. Specifically, as shown in fig. 3, in the present embodiment, the first filter screen 5 includes a heat insulation layer 51, an air duct partition 52 and protective cotton 53. Through setting up the insulating layer can play and keep apart external radiation, reduce the effect to the influence of inside device. The air duct partition plate can divide an air inlet area into different areas according to different protection grades, and different protection cottons can be installed in different areas according to the protection grades required. As shown in fig. 4, in particular, in the present embodiment, the second filter screen panel 6 comprises an insulation area 61 and a ventilation area 62. Different protection cotton can be installed by dividing different areas according to devices with different protection grade requirements through arranging the heat insulation area and the ventilation area. Preferably, the first filter screen plate 5 and the second filter screen plate 6 comprise double S-shaped louvers and filter cottons of different specifications.

As shown in fig. 1 and 2, further, in a preferred embodiment, a protective assembly 7 is provided on the top of the cabinet 1. Through setting up protection component, can play key guard action and can regard as second wind-guiding passageway to the controlling means of the internal core of cabinet. Specifically, as shown in fig. 5, in a preferred embodiment, the guard assembly 7 includes a filter plate 71, a top plate 72, and a side baffle 73. The filter plates 71 are located on both upper and lower sides of the top plate 72, and the side baffles 73 are located on both left and right sides of the top plate 72. The filter can ensure that the protective action to the internal device of cabinet is increased when not influencing the second wind channel radiating effect, avoids the pollution of dust and rainwater. As shown in fig. 6, in a preferred embodiment, the bottom of the top plate 72 is provided with the middle partition 74 arranged in left-right symmetry to form the independent first air duct 101 and the second air duct 102. Through the arrangement form that the middle partition plate is arranged at the bottom of the top plate to form a plurality of independent air channels, the cabinet body can simplify the structure as much as possible on the premise of meeting the heat dissipation, and the production and manufacturing cost is reduced. Preferably, the filter plate 71 is uniformly provided with a plurality of fine holes for ventilation, and the filter plate 71 is detachably coupled to the top plate, thereby facilitating installation and maintenance. In order to facilitate the maintenance of the devices in the cabinet body, the protection component 7 is provided with a hinge, and can be opened to a certain maintenance angle.

As shown in fig. 1 and 2, in a preferred embodiment, two sides of the cabinet 1 are provided with "U" shaped air outlets 13 capable of communicating with the first air guiding channel. The hot air in the first air channel can be guided out of the cabinet body through the U-shaped air outlet cylinder to avoid backflow. In a preferred embodiment, as shown in fig. 9, two "U" shaped panels 14 are symmetrically disposed on the back of the cabinet 1 near the middle. Through setting up two "U" shaped plates, can be with the leading-in to first wind channel of the cold air from first filter plate process to the air inlet area in increase first wind channel improves the radiating effect.

Further, as shown in fig. 7 and 8, in a preferred embodiment, an air box 8 is provided in the first air duct 101, and a fan 9 is provided in the air box 8 for dissipating heat of the first air duct 101. A small axial flow fan 9 is arranged in the second air duct 102 and used for heat dissipation of the second air duct 102. Through the heat radiation structure who sets up bellows and fan, the radiating effect is good, simple structure, and manufacturing cost is low. The mounting position of the small axial flow fan 9 is arranged corresponding to the two mounting round holes on the protective component 7, as shown in fig. 5.

As shown in fig. 1 to 4 and 6 to 9, the curves represent the air directions in the first air duct 101 and the second air duct 102, and the converter 10 of the embodiment of the present invention is divided into two protection levels of heat dissipation air ducts. The components in the first air duct 101 do not need to be very strictly protected, and therefore are set to be low-protection-level air ducts. The second air duct 102 is provided with a core control device inside, which needs to be protected mainly, and thus is set as a high-protection-level air duct.

The airflow direction of the first air duct 101 is mainly: a large amount of cold air enters the cabinet body through the lower half part of the first filter screen plate 5 on the front side of the cabinet body 1, the first filter screen plate 5 on the back side and the second filter screen plate 6 on the front side of the cabinet body 1, enters the radiator air duct 41 of the inverter unit 4 through devices such as the direct current power distribution unit 3 and the reactor 2, carries out heat exchange, and is taken out of the cabinet body 1 through the fan 9 in the air box 8. In order to avoid the backflow air, the hot air in the first air duct 101 is discharged to the outside environment through the "U" shaped air outlet cylinders 13 outside the two sides of the cabinet 1. The airflow direction of the second air duct 102 is mainly: a small amount of cold air enters the cabinet body 1 through the upper half part of the first filter screen plate 5, passes through the rest parts of the inverter unit 4 except the radiator air duct 41 and the alternating current area, takes away corresponding heat, and is led out of the cabinet body 1 after being brought into the protection component 7 by the lower axial flow fan 9 at the top of the cabinet body 1. According to the embodiment, the converter has good heat dissipation characteristics, and the cost can be saved as far as possible on the premise of reasonably meeting the use environment requirements of the converter.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A converter is characterized by comprising a cabinet body, a reactor, a power distribution unit and an inversion unit; the front side of the cabinet body comprises direct current and inversion cavities which are arranged on two sides, and an alternating current cavity is arranged between the direct current and inversion cavities;

the reactor and the power distribution unit are both arranged at the bottom of the direct current and inversion cavity, the inversion unit is positioned above the power distribution unit, and an IGBT module in the inversion unit is positioned in the alternating current cavity;

two independent first air channels which can be respectively communicated with the direct current cavity and the inversion cavity are arranged on two sides of the position, close to the top, in the cabinet body, and an independent second air channel which can be communicated with the alternating current cavity is arranged in the middle of the position, close to the top, in the cabinet body;

the two sides of the cabinet body are provided with first air guide channels which can be respectively communicated with the first air channels, the top of the cabinet body is provided with a second air guide channel which can be communicated with the second air channels,

wherein the first air duct is configured as a low protection grade air duct and the second air duct is configured as a high protection grade air duct, and the cooling air entering the first air duct is more than the cooling air entering the second air duct.

2. The converter according to claim 1, wherein the first filter screen is disposed on the front surface of the DC and the inverter cavities, and the second filter screen is disposed on the front surface of the AC cavity.

3. The converter according to claim 2, wherein the first filter screen comprises a thermal insulation layer, a duct partition and protective cotton.

4. The current transformer of claim 2 or 3, wherein the second filter screen comprises a thermal insulation zone and a ventilation zone.

5. The converter according to any of claims 1 to 3, wherein a protection assembly is provided on the top of the cabinet, the protection assembly comprising a filter plate, a top plate and a side baffle; the filter plates are positioned on the upper side surface and the lower side surface of the top plate, the side baffles are positioned on the left side and the right side of the top plate, and the bottom of the top plate is provided with a middle partition plate which is arranged in a bilateral symmetry mode, so that the first air duct and the second air duct which are independent are formed.

6. The converter according to any one of claims 1 to 3, wherein "U" -shaped air outlet cylinders capable of communicating with the first air guiding channel are arranged on two sides of the cabinet body.

7. The converter according to any one of claims 1 to 3, wherein two "U" shaped plates are symmetrically arranged on the back of the cabinet body near the middle position.

8. The converter according to any one of claims 1 to 3, wherein a wind box is arranged in the first wind channel, and a first fan is arranged in the wind box; and a second fan is arranged in the second air duct.