CN110707903A - High voltage frequency conversion device - Google Patents

Abstract

The invention relates to a frequency conversion device, in particular to a high-voltage frequency conversion device, comprising: a cabinet body, a frequency converter unit and a transformer arranged in the cabinet body, and a partition assembly, which separates the space in the cabinet into first and second parts. In the second and third accommodating areas, the frequency converter unit is arranged in the first accommodating area. The cabinet is provided with a first air inlet connected to the first accommodating area, a second air inlet connected to the second accommodating area, and an air outlet connected to the third accommodating area, the air outlet is connected to the fan, and the transformer is along the axis direction of the air outlet A first ventilation hole connecting the first and third accommodating areas and a second ventilation hole communicating with the first and second accommodating areas are opened on the spacing component. Compared with the prior art, the first and second accommodating areas are connected in parallel by means of the first and second air inlets respectively. Therefore, while ensuring that one fan is shared, the air duct has a short path and fewer bends. The pressure drop can reduce the production cost of the entire device.

Description

High voltage frequency conversion device

technical field

The invention relates to a frequency conversion device, in particular to a high-voltage frequency conversion device.

Background technique

The frequency converter, as an energy-saving device that adjusts the speed of the AC motor by changing the working power frequency of the motor, is widely used, among which the high-voltage frequency converter plays an important role in the development of high-power industrial automation. The high-voltage inverter cabinet mainly includes: inverter unit cabinet, transformer and control cabinet. At present, most high-voltage inverter cabinets use transformers and inverter unit cabinets to form separate cabinets, and each is equipped with a cooling fan, resulting in a large cabinet volume, large installation space and high cost. Therefore, the compact high-voltage inverter cabinet has been favored by everyone. However, most of the existing inverter unit cabinets and transformers are installed in the same cabinet and share the fan on the top of the cabinet, which makes the cabinet structure compact, greatly saves installation space and reduces costs. However, due to the existing heat dissipation method of the unit cabinet and the transformer is a series air duct, on the one hand, after the cold air flows in from the air inlet, it first flows through the unit cabinet, then flows through the transformer, and finally is extracted by the fixed fan, and the series air duct is long. , the turning angle of the wind direction is too large, and the cooling air ducts of the transformer are mostly narrow gaps, so the system resistance is relatively large, and the requirements for the top fan of the cabinet are relatively high. Although, in order to reduce the resistance of the system, some cabinets have added auxiliary fans, but this method increases space and cost. On the other hand, after the cold air absorbs the heat of the unit cabinet, the temperature rises, and the high temperature air flows through the transformer, which is not conducive to the heat dissipation of the transformer, and even causes the air temperature of the air outlet to reach the temperature resistance limit of the fan, making the entire heat dissipation system invalid. Reduce device reliability.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-voltage frequency conversion device, which can meet the cooling requirements in the cabinet without installing the auxiliary fan while meeting the installation of the inverter unit and the transformer in the same cabinet.

In order to achieve the above purpose, an embodiment of the present invention provides a high-voltage frequency conversion device, comprising: a cabinet, a fan, at least one frequency converter unit and a transformer arranged in the cabinet, and the high-voltage frequency conversion device further includes:

A partition component is arranged in the cabinet and used to divide the space in the cabinet into a first accommodating area, a second accommodating area and a third accommodating area respectively opposite to the first accommodating area , each of the frequency converter units is arranged in the first accommodating area;

The cabinet is also provided with a first air inlet communicating with the first accommodating area, a second air inlet communicating with the second accommodating area, and an air outlet communicating with the third accommodating area, The air outlet is used to connect the fan, the second accommodating area and the third accommodating area are arranged opposite to each other along the axial direction of the air outlet, and the transformer runs through the air outlet along the axial direction of the air outlet. the spacer assembly;

At least one first ventilation hole communicating with the first accommodating area and the third accommodating area, at least one ventilating hole communicating with the first accommodating area and the second accommodating area, and Second vent.

Compared with the prior art, the embodiments of the present invention, in the actual application process, rely on the force of the fan, so that the outside air can enter the first accommodating area and the second accommodating area respectively through the first air inlet and the second air inlet. part of the air flow entering the first accommodating area can directly cool each inverter unit, and after cooling each inverter unit, it can directly pass through the first The ventilation hole enters the third accommodating area and is drawn out from the air outlet through the fan, while another part of the airflow can enter the second accommodating area through the second ventilation hole to cool the transformer. It directly enters the third accommodating area with the help of the transformer, and is drawn out from the air outlet through the fan. It is not difficult to see from this that the first accommodating area and the second accommodating area of the present application use the first air inlet and the second air inlet respectively. The realization of parallel connection is different from the current technology of connecting air ducts in series. There is no airflow to absorb the heat of one heat source and then continue to dissipate heat to the other heat source. At the same time, because it is different from the series air duct, the air duct has a short path, less bending and lower pressure, and can also share a fan, which reduces the performance requirements for the fan, and improves the heat dissipation performance without adding any auxiliary fans. The production cost of the entire device can be reduced.

Further, the spacer assembly includes:

a first bracket, arranged in the cabinet along the axis direction parallel to the air outlet;

a second bracket, arranged in the cabinet along the axis direction perpendicular to the air outlet;

The second bracket is connected to the first bracket, and the second bracket is arranged opposite to the air outlet, and the second accommodating area and the third accommodating area are along the axial direction of the air outlet are located on both sides of the second bracket, and both the second accommodating area and the third accommodating area are arranged opposite to the first accommodating area along the axis direction perpendicular to the air outlet, and the A transformer penetrates the second bracket.

Further, the number of the first ventilation holes is the same as the number of the frequency converter units, and corresponds to them one by one;

Each of the frequency converter units is arranged on the first bracket, and each of the frequency converter units is arranged opposite to the corresponding first ventilation hole.

Further, each of the first ventilation holes is evenly distributed along the axial direction of the air outlet.

Further, the second bracket includes:

the first horizontal section is arranged opposite to the air outlet along the axial direction of the air outlet; one end of the first horizontal section relative to the first bracket is also spaced apart from the first bracket;

a vertical section, connected with one end of the first horizontal section opposite to the first bracket; the vertical section is also spaced apart from the first bracket;

a second horizontal segment, respectively connected with one end of the vertical segment away from the first horizontal segment and the first bracket;

The second ventilation hole is located below the second horizontal section, and the second air inlet is located below the first horizontal section.

Further, the first horizontal section is an epoxy board.

Further, the second horizontal section is formed by bending and extending an end of the vertical section away from the first horizontal section toward the first bracket.

Further, the transformer includes: a plurality of windings, and the windings are spaced apart to form an air duct connecting the second accommodating area and the third accommodating area.

Further, the winding sequentially includes: a high-voltage coil, a first insulating layer, a low-voltage coil, a second insulating layer, and an iron core from the outside to the inside; wherein, the high-voltage coil and the second spacer are separated from each other, between the high-voltage coil and the first insulating layer, between the first insulating layer and the low-voltage coil, between the low-voltage coil and the second insulating layer, and between the second insulating layer and the The iron cores are separated from each other to form a first air layer, and each of the first air layers communicates with the second accommodating area and the third accommodating area.

Further, the winding also includes: an outer layer of air duct; the outer layer of air duct surrounds the high-voltage coil and is spaced apart from the high-voltage coil to form a second air layer, and the second air layer communicates with the second accommodating area and the third accommodating area.

Further, there is a preset ratio between the opening area of the first ventilation hole and the opening area of the second ventilation hole.

Description of drawings

1 is a schematic structural diagram of a high-voltage frequency conversion device according to a first embodiment of the present invention;

2 is a schematic diagram of the airflow direction of the high-voltage frequency conversion device according to the first embodiment of the present invention;

3 is a schematic structural diagram of the transformer in the first embodiment of the present invention when the outer air duct is not provided;

FIG. 4 is a schematic structural diagram of a transformer provided with an outer air duct in the first embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can appreciate that, in the various embodiments of the present invention, many technical details are set forth in order for the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the claims of the present application can be realized.

The first embodiment of the present invention relates to a high-voltage frequency conversion device, as shown in FIG. 1 , including a cabinet 1 , a fan 2 , a plurality of inverter units 3 and a transformer 4 arranged in the cabinet 1 . In addition, as shown in FIG. 1 , the high-voltage frequency conversion device of this embodiment further includes: a partition assembly 5 disposed in the cabinet 1 , and the partition assembly 5 is used to separate the space in the cabinet 1 into a first accommodating area 11. A second accommodating area 12 and a third accommodating area 13 respectively opposite to the first accommodating area 11 . Wherein, as shown in FIG. 1 , each frequency converter unit 3 is arranged in the first accommodating area 11 .

In addition, as shown in FIG. 1 , in this embodiment, the cabinet 1 is further provided with a first air inlet 14 communicating with the first accommodating area 11 , a second air inlet 15 communicating with the second accommodating area 12 , and The air outlet 16 is communicated with the third accommodating area 13 , and the air outlet 16 is used to connect the fan 2 . In addition, the second accommodating area 12 and the third accommodating area 13 are disposed opposite to each other along the axial direction of the air outlet 16 , and the transformer 4 penetrates along the axial direction of the air outlet 16 and penetrates the partition assembly 5 .

In addition, as shown in FIG. 1 , a plurality of first ventilation holes 6 connecting the first accommodating area 11 and the third accommodating area 13 are opened on the partition assembly 5 , and one connecting the first accommodating area 11 and the second accommodating area The second ventilation hole 7 of the zone 12. In the actual application process, under the action of the fan 2, the external air flow can enter the first accommodating area 11 and the second accommodating area 12 through the first air inlet 14 and the second air inlet 15 respectively, and enter the first accommodating area 11 and the second accommodating area 12 respectively. A part of the airflow in the accommodating area 11 can directly cool each inverter unit 3, and after cooling each inverter unit 3, it can directly enter through each first ventilation hole 6 opened on the partition assembly 5. The third accommodating area 13 is drawn out from the air outlet 16 through the fan, and another part of the air flow can enter the second accommodating area 12 through the second ventilation hole 7 to cool the transformer arranged in the transformer 4, while cooling The latter part of the airflow can also directly enter the third accommodating area 13 by means of the transformer, and be extracted from the air outlet 16 through the fan 2 . The airflow entering the second accommodating area 12 through the second air inlet 15 can directly enter the transformer 4 to cool the transformer arranged in the transformer 4, and at the same time, the cooled part of the airflow can directly enter the third through the transformer 4. The accommodating area 13 is drawn out from the air outlet 16 through the fan 2 .

It is not difficult to see from the above content that the first accommodating area 11 and the second accommodating area 12 in this embodiment are connected in parallel by means of the first air inlet 14 and the second air inlet 15 respectively, which is different from the current technical scheme of connecting air ducts in series , there is no airflow between the two to absorb the heat of one heat source, and then continue to dissipate heat to the other heat source. At the same time, because it is different from the series air duct, the air duct has a short path, less bending and lower pressure, and can also share a fan, which reduces the performance requirements for the fan, and improves the heat dissipation performance without adding any auxiliary fans. The production cost of the entire device can be reduced.

Specifically, as shown in FIG. 1 , in this embodiment, the partition assembly 5 includes: a first bracket 51 and a second bracket 52 , and the first bracket 51 is disposed on the cabinet along an axis parallel to the air outlet 16 . The second bracket 52 is arranged in the cabinet 1 along the axis direction perpendicular to the air outlet 16 . In addition, the second bracket 52 is also connected to the first bracket 51 , and the second bracket 52 is also disposed opposite to the air outlet 16 , so that the second accommodating area 12 and the third accommodating area 13 can be along the axis of the air outlet 16 . They are located on both sides of the second bracket 52 respectively, and at the same time, both the second accommodating area 12 and the third accommodating area 13 are arranged opposite to the first accommodating area 11 along the axis direction perpendicular to the air outlet 16 . Therefore, in the actual assembly process, the transformer 4 can be directly penetrated through the second bracket 52, and correspondingly in this embodiment, the number of the inverter units 3 is the same as the number of the first ventilation holes 6, and both are multiple, They are in one-to-one correspondence, and each inverter unit 3 is arranged on the first bracket 51. At the same time, each inverter unit 3 is also arranged opposite to its corresponding first ventilation hole 6, that is, each first ventilation hole 6 faces the first ventilation hole 6. One side of an accommodating area 11 is covered by the corresponding inverter units 3, so that part of the airflow entering the first accommodating area 11 through the first air inlet 14 can directly enter each inverter unit 3, To cool the frequency converter units 3, and at the same time, after cooling the frequency converter units, this part of the air flow can directly enter the third accommodating area 13 through the first ventilation holes 6 opened on the first bracket 51, and then enter the third accommodating area 13. Under the action of the fan 2 , the air is discharged out of the cabinet 1 through the air outlet 16 .

In addition, it is worth mentioning that, in this embodiment, in order to increase the flow rate of the airflow entering the cabinet 1, as shown in FIG. 1 and FIG. 2 , there are multiple first air inlets 14 in this embodiment, And each first air inlet 14 is arranged along the height direction of the cabinet 1, that is, arranged along the axis direction parallel to the air outlet 16, so that the airflow entering the cabinet 1 can be more uniformly filled in the first air. Various positions in the accommodating area 11 .

In addition, as shown in FIG. 3 , in this embodiment, the transformer 4 specifically includes: three windings 41 , and each winding 41 is sequentially formed from inside to outside: a high-voltage coil 412 , a first insulating layer 413 , and a low-voltage coil 414 , the second insulating layer 415 , and the iron core 416 . Wherein, the high-voltage coil 412 and the second partition member 52 are separated from each other, so that the airflow can pass between the high-voltage coil 412 and the second partition member 52 , thereby realizing heat dissipation of the high-voltage coil 412 . In addition, between the high voltage coil 412 and the first insulating layer 413 , between the first insulating layer 413 and the low voltage coil 414 , between the low voltage coil 414 and the second insulating layer 415 , and between the second insulating layer 415 and the iron core 416 The first air layers 417 are formed spaced apart from each other. Therefore, when the airflow entering the second accommodating area 12 through the second ventilation hole 7 can directly enter the third accommodating area 13 through each first air layer 417 in the transformer 4, and finally be drawn out from the air outlet 16 by the fan 2, At the same time, after the airflow enters each air layer of each winding 41 of the transformer, heat dissipation to the high-voltage coil 412 and the low-voltage coil 414 can be achieved.

However, it should be noted that, in the process of practical application, as an alternative solution, as shown in FIG. 4 , the transformer 4 may further include: an outer air duct 411 , and the outer air duct 411 surrounds the high-voltage coil 412 , and closely fit with the second spacer 52 and spaced apart from the high-voltage coil 412 , and form a second air layer 418 , the second air layer 418 communicates with the second accommodating area 12 and the third accommodating area 13 , so that the heat dissipation to the high-voltage coil 412 can be further improved under the action of the second air layer 418 . In addition, in order to realize the fixation of the transformer, a bracket (not shown in the figure) for supporting the transformer 4 can be arranged in the cabinet 1. The bracket can effectively support the transformer 4 in the cabinet 1 .

In addition, as a preferred solution, in this embodiment, the opening area of each first ventilation hole 6 and the opening area of the second ventilation hole 7 may be in a preset ratio, that is, each first ventilation hole 6 The opening area of the second ventilation hole 7 is different from that of the second ventilation hole 7. In this way, the airflow entering the transformer 4 through the second ventilation hole 7 can be controlled to achieve the best heat dissipation performance.

Furthermore, it should be noted that, in this embodiment, as shown in FIG. 1 , the second bracket 52 includes: a first horizontal segment 521 , a vertical segment 522 and a second horizontal segment 523 . The first horizontal section 521 is disposed opposite to the air outlet 16 along the axial direction of the air outlet 16 , and one end of the first horizontal section 521 relative to the first bracket 51 is also spaced from the first bracket 51 . Secondly, the vertical section 522 is connected with one end of the first horizontal section 521 opposite to the first bracket 51 , and the vertical section 522 is also arranged parallel to the first bracket 521 and spaced apart from the first bracket 51 . Finally, the second horizontal section 523 is respectively connected with one end of the vertical section 522 away from the first horizontal section 521 and the first bracket 51 . From this, it is not difficult to see that with this design, the side of the third accommodating area 13 facing the second accommodating area 12 has an extension section, that is, the vertical section 522 and the first bracket 51 form a third accommodating section between the vertical section 522 and the first bracket 51 . The air duct 10 connected to the placement area 13 is provided. Therefore, the first bracket 51 faces the side of the first accommodating area 11 , and more inverter units 3 can be installed along the axis direction parallel to the air outlet 16 . In addition, with this air duct design, the second ventilation hole 7 can be opened at the position where the first bracket 51 is located below the second horizontal section 523, and at the same time, the second air inlet 15 can be opened at the cabinet 1 located in the first horizontal section. The position below 521 allows the air flow through the second ventilation hole 7 to enter the third accommodating area 13 directly through the air duct formed between the vertical section 522 and the first bracket 51, and pass through the second air inlet 15. The airflow entering the second accommodating area 12 can directly enter the third accommodating area 13 through the air duct in the transformer 4 .

Specifically, in this embodiment, the second horizontal section 523 and the vertical section 522 are integrally formed, that is, the vertical section 522 is formed by bending and extending an end away from the first horizontal section 521 toward the first bracket 51 . Moreover, as shown in FIG. 1 , as a preferred solution, the first horizontal section 521 used in this embodiment is an epoxy board, because the epoxy board can have good stability and mechanical properties in a high humidity and high temperature environment. performance, which can improve the insulation performance of the transformer.

Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present invention, and in practical applications, various changes in form and details can be made without departing from the spirit and the spirit of the present invention. scope.

Claims (11)

1. A high-voltage frequency conversion device, comprising a cabinet, a fan, at least one frequency converter unit and a transformer arranged in the cabinet, characterized in that: the high-voltage frequency conversion device also includes: The partition assembly is arranged in the cabinet, and the space in the cabinet is divided into a first accommodating area, a second accommodating area and a third accommodating area respectively opposite to the first accommodating area, each the frequency converter unit is arranged in the first accommodating area; The cabinet is also provided with a first air inlet communicating with the first accommodating area, a second air inlet communicating with the second accommodating area, and an air outlet communicating with the third accommodating area, The air outlet is used to connect the fan, the second accommodating area and the third accommodating area are arranged opposite to each other along the axial direction of the air outlet, and the transformer runs through the air outlet along the axial direction of the air outlet. the spacer assembly; At least one first ventilation hole communicating with the first accommodating area and the third accommodating area, at least one ventilating hole communicating with the first accommodating area and the second accommodating area, and Second vent. 2 . The high-voltage frequency conversion device according to claim 1 , wherein the partition assembly comprises: 2 . a first bracket, arranged in the cabinet along the axis direction parallel to the air outlet; a second bracket, arranged in the cabinet along the axis direction perpendicular to the air outlet; The second bracket is connected to the first bracket, and the second bracket is arranged opposite to the air outlet, and the second accommodating area and the third accommodating area are along the axial direction of the air outlet are located on both sides of the second bracket, and both the second accommodating area and the third accommodating area are arranged opposite to the first accommodating area along the axis direction perpendicular to the air outlet, and the A transformer penetrates the second bracket. 3. The high-voltage frequency conversion device according to claim 2, wherein the number of the first ventilation holes is the same as the number of the frequency converter units, and corresponds to them one by one; Each of the frequency converter units is arranged on the first bracket, and each of the frequency converter units is arranged opposite to the corresponding first ventilation hole. 4 . The high-voltage frequency conversion device according to claim 3 , wherein each of the first ventilation holes is evenly distributed along the axial direction of the air outlet. 5 . 5. The high-voltage frequency conversion device according to claim 1, wherein the second bracket comprises: the first horizontal section is arranged opposite to the air outlet along the axial direction of the air outlet; one end of the first horizontal section relative to the first bracket is also spaced apart from the first bracket; a vertical section, connected with one end of the first horizontal section opposite to the first bracket; the vertical section is also spaced apart from the first bracket; a second horizontal segment, respectively connected with one end of the vertical segment away from the first horizontal segment and the first bracket; The second ventilation hole is located below the second horizontal section, and the second air inlet is located below the first horizontal section. 6 . The high-voltage frequency conversion device according to claim 5 , wherein the first horizontal section is an epoxy board. 7 . 7 . The high-voltage frequency conversion device according to claim 5 , wherein the second horizontal section is formed by bending and extending an end of the vertical section away from the first horizontal section toward the first bracket. 8 . . 8 . The high-voltage frequency conversion device according to claim 2 , wherein the transformer comprises: a plurality of windings, and the windings are spaced apart to form a connection between the second accommodating area and the third accommodating area. 9 . air duct. 9 . The high-voltage frequency conversion device according to claim 8 , wherein the windings sequentially include: a high-voltage coil, a first insulating layer, a low-voltage coil, a second insulating layer, and an iron core from the outside to the inside; 9 . Wherein, the high-voltage coil and the second spacer are separated from each other, between the high-voltage coil and the first insulating layer, between the first insulating layer and the low-voltage coil, and between the high-voltage coil and the first insulating layer. A first air layer is formed between the low-voltage coil and the second insulating layer, and between the second insulating layer and the iron core, and each of the first air layers communicates with the second accommodating area and the third accommodation area. 10 . The high-voltage frequency conversion device according to claim 9 , wherein the winding further comprises: an outer-layer air duct; the outer-layer air duct surrounds the high-voltage coil and is spaced apart from the second coil. 11 . The outer air duct and the high-voltage coil are spaced apart to form a second air layer, and the second air layer communicates with the second accommodating area and the third accommodating area. 11 . The high-voltage frequency conversion device according to claim 1 , wherein the opening area of the first ventilation hole and the opening area of the second ventilation hole are in a preset ratio. 12 . .

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