Power unit and triangular transformer compact structure and high-voltage frequency converter

Abstract

The utility model provides a power unit and triangular transformer compact structure and a high-voltage frequency converter, which belong to the field of frequency converters and comprise a power unit assembly, a triangular transformer and a connecting structure. The power unit assembly comprises three layers of vertically arranged insulating cross beams and a plurality of power units installed on the insulating cross beams, and the power units are arranged on the insulating cross beams in a linear horizontal array mode. The power unit assembly is arranged in front of the triangular transformer, the triangular transformer and the power unit assembly are arranged in a back-to-back mode, and a secondary tap is arranged opposite to the back face of the power unit. The connecting structure comprises a connecting cable, a wire passing hole and an input copper piece, and the connecting cable is led out from the secondary tap and directly penetrates through the wire passing hole to be connected to the input copper piece. The frequency converter is reasonable in space layout, compact in structure, small in size, small in occupied area, and low in land cost and manufacturing cost; the cable distance is shortened by the cable direct connection mode, the cable loss is reduced, the wiring is simple, and the later maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the field of frequency converters, in particular to a compact structure of a power unit and a triangle transformer and a high-voltage frequency converter. Background Art

[0002] High-voltage inverters are powered by the power grid. After passing through the inverter's transformer cabinet, the power supply is output via cables to the power cabinet. The control cabinet controls the rectifier and inversion of the power cabinet, which is then output from the power cabinet to the motor to drive the motor. These inverters are widely used in various fans, pumps, compressors, rolling mills, and other equipment in industries such as mining, petrochemicals, municipal water supply, metallurgy, and electric power. When arranging the transformer and power unit, current technology typically uses an inline transformer with eccentric or symmetrical secondary taps to connect the power unit. This spatial layout limits the length of the transformer, even for highly integrated integrated high-voltage inverters. This results in internal space redundancy, low space utilization, a large size, and a large equipment footprint. This also affects cable connections and subsequent maintenance of the high-voltage inverter, resulting in long cables, cluttered wiring, and poor installation and maintenance convenience. Utility Model Content

[0003] The purpose of the utility model is to provide a compact structure of a power unit and a triangular transformer, adopt a triangular transformer to optimize the electrical layout, and the power unit and the triangular transformer are arranged back to back to achieve a compact space layout and high space utilization; the secondary tap of the triangular transformer is opposite to the back of the power unit, and the cable is led out from the secondary tap, passes through the wire hole of the insulating beam, and is directly connected to the power unit. The direct cable connection method shortens the cable distance, reduces cable loss, and has simple and smooth wiring, efficient wiring, and improved convenience for later maintenance.

[0004] Another object of the present invention is to provide a high-voltage inverter, which adopts the compact structure of the above-mentioned power unit and triangular transformer, has a reasonable spatial layout and a compact structure, reduces the overall volume of the product, thereby reducing the equipment footprint, and reducing land costs and manufacturing costs.

[0005] To achieve the above objectives, the technical solutions provided by this application are:

[0006] In the first aspect, the utility model provides a compact structure of a power unit and a triangular transformer, including a power unit assembly, a triangular transformer, and a connection structure. The power unit assembly includes three layers of insulating beams arranged in a vertical direction, and a plurality of power units mounted on the insulating beams, and the power units are fixed in a horizontal array on each layer of insulating beams. The triangular transformer has a triangular prism shape and is arranged back to back with the power unit assembly, and its secondary tap is arranged relatively regularly with the back of the power unit. The connection structure includes a connecting cable, a wire hole on the insulating beam, and an input copper piece on the power unit. The connecting cable is led out from the secondary tap of the triangular transformer, passes through the wire hole, and is directly connected to the input copper piece.

[0007] Preferably, in order to facilitate observation of the working status, the power unit is usually arranged facing the operator. In a specific arrangement, the power unit assembly is arranged in front of the triangular transformer.

[0008] Preferably, at least two insulating beams are provided in each layer, the total number of power units corresponds to a three-phase circuit, and each layer of insulating beams carries a single-phase power unit.

[0009] Preferably, the insulating beam is provided with a wire hole below each power unit, and the diameter of the wire hole matches the outer diameter tolerance of the connecting cable.

[0010] Preferably, the insulating beam is molded using SMC insulating material.

[0011] In a preferred embodiment of the present invention, the secondary taps of the triangle transformer are horizontally arranged between the two coils of the triangle transformer, and each set of secondary taps is connected to a corresponding power unit.

[0012] In another preferred embodiment of the present invention, the secondary taps of the triangular transformer are arranged on the left and right sides of a single coil in a centrally symmetrical manner, and each set of secondary taps is connected to a corresponding power unit.

[0013] Preferably, the R, S, and T three-phase contacts of each set of secondary taps are arranged in a herringbone shape, and the distance between adjacent contacts matches the outer diameter of the connecting cable.

[0014] Preferably, the total length of the triangular transformer is less than or equal to the sum of the lengths of the power units in each layer.

[0015] In a second aspect, the utility model provides a high-voltage inverter, comprising a cabinet and any one of the above-mentioned power units and a compact structure of a triangular transformer, wherein the power unit and the compact structure of the triangular transformer are arranged in the cabinet.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] A triangular transformer is used to optimize the electrical layout. The power unit and the triangular transformer are arranged back-to-back to achieve a compact spatial layout, reduce the overall volume of the product, and thus reduce the equipment footprint, land cost and manufacturing cost. The secondary tap of the triangular transformer is opposite to the back of the power unit. The cable is led out from the tap, passes through the wire hole of the insulating beam, and is directly connected to the power unit, shortening the cable distance and reducing cable loss. The wiring is simple and smooth, the wiring is efficient, and the convenience of subsequent maintenance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 This is a front view of the compact structure of the power unit and triangular transformer provided by the utility model;

[0020] Figure 2 A partial three-dimensional diagram of the compact structure of the power unit and triangular transformer provided by the utility model;

[0021] Figure 3 This is a wiring diagram of the secondary tap and the power unit provided by the utility model;

[0022] Figure 4 This is a schematic diagram of the secondary tap arrangement of the triangle transformer provided by the utility model;

[0023] Figure 5 This is a schematic diagram of the arrangement of the triangular transformer provided by the utility model, in which the secondary tap is set between the two coils;

[0024] Figure 6 This is a schematic diagram of the arrangement of the triangular transformer provided by the utility model, in which the secondary taps are set on the left and right sides of a single coil;

[0025] Figure 7 This is a front view of the first embodiment of the high-voltage frequency converter provided by the present utility model;

[0026] Figure 8 This is a front view of another embodiment of the high-voltage inverter provided by the utility model.

[0027] Reference numerals: delta transformer 100 , connecting cable 101 , insulating beam 102 , power unit 103 , secondary tap 104 , wire hole 105 , input copper fitting 106 . DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in detail with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood when implemented in a suitable environment. The following description is a concretization of the claims of the present invention, and other specific implementations related to the claims that are not explicitly described also fall within the scope of the claims.

[0029] In this utility model, the terms "install," "connect," "connect," and "fix" should be understood in a broad sense. For example, "connect" can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0031] like Figures 1 to 4 As shown, the compact structure of the power unit and the triangular transformer provided by an embodiment of the present invention includes a power unit assembly, a triangular transformer 100, and a connection structure. Among them, the power unit assembly includes three layers of insulating beams 102 arranged in a vertical direction, and a plurality of power units 103 mounted on the insulating beams 102. The triangular transformer 100 has a triangular prism shape, and its secondary tap 104 is arranged relatively regularly with the back of the power unit 103. The connection structure includes a connecting cable 101, a wire hole 105 on the insulating beam 102, and an input copper part 106 on the power unit 103. The triangular transformer 100 is electrically connected to the power unit 103 through the connecting cable 101.

[0032] In further implementation, the total number of power cells 103 corresponds to a three-phase circuit, and the three layers of insulating beams 102 correspond to the three-phase power cells 103. Each layer of insulating beams 102 supports a single-phase power cell 103. Specifically, the multiple power cells 103 are arranged in layers on the three layers of insulating beams 102, and are fixed in a horizontal array on each layer of insulating beams 102. The power cells 103 include R, S, and T three-phase input copper fittings 106 for connecting to external devices.

[0033] In further implementation, at least two insulating beams 102 are provided on each layer to support the power units 103. Under each power unit 103, each insulating beam 102 is provided with a wire hole 105 for connecting the wiring channel of the cable 101. The diameter of the wire hole 105 matches the outer diameter tolerance of the connecting cable 101, and its aperture is ≥ the outer diameter of the cable + 2~3mm. The insulating beam 102 serves as a support frame for the power unit 103, a phase sequence isolation frame for the three-phase circuit, and a cable wiring channel. Considering the electrical insulation performance, arc resistance, and mechanical support strength, the insulating beam 102 is molded using SMC insulating material, which can ensure safety and reliability and can be mass-produced. In addition, the cross section of the insulating beam 102 can be set to a commonly used U-shaped cross section, which is not limited by the present invention.

[0034] In further implementation, in order to facilitate observation of the working status and maintenance operations, the power unit 103 is usually arranged facing the user or operator. Specifically, the above-mentioned power unit assembly is arranged in front of the triangular transformer 100 and is arranged back to back with the triangular transformer 100. In this embodiment, the total length of the triangular transformer 100 is less than or equal to the sum of the lengths of the power units 103 on each layer, so that the power unit assembly is no longer restricted by the length of the transformer. On the basis of reasonable structural design, the length of each layer of power units 103 can be greatly reduced, thereby reducing the volume of the product. In actual applications, the total length of the inverter using this compact structure is no longer restricted by the total length of the transformer, making the overall volume of the inverter smaller, thereby reducing the equipment footprint, land costs and manufacturing costs.

[0035] In one embodiment of the present invention, Figure 5 As shown, the secondary taps 104 of the triangle transformer 100 are horizontally arranged between the two coils of the triangle transformer 100 , and the secondary taps 104 face the back of the power unit assembly. Each set of secondary taps 104 is connected to one power unit 103 .

[0036] In another embodiment of the present invention, Figure 6 As shown, the secondary taps 104 of the triangular transformer 100 are arranged on the left and right sides of a single coil of the triangular transformer 100 in a centrally symmetrical manner. The secondary taps 104 on both sides are arranged opposite to the back of the power unit assembly in a centrally symmetrical manner, and each group of secondary taps 104 is connected to a corresponding power unit 103.

[0037] In the embodiment of the present invention, the R, S, and T three-phase contacts of each set of secondary taps 104 of the triangle transformer 100 are arranged in a herringbone shape, and the distance between adjacent contacts matches the outer diameter of the connecting cable 101 .

[0038] For further implementation, the cable connection path is set as follows: the connecting cable 101 is first connected to the R, S, and T three-phase contacts of each group of secondary taps 104, and then the secondary taps 104 are brought out in strands, passed through the wire holes 105, and then connected to the R, S, and T three-phase input copper parts 106 of the power unit 103. This direct cable connection method shortens the cable routing distance, makes the routing simple and smooth, and reduces cable loss.

[0039] The embodiment of the present invention further provides a high voltage inverter, comprising a cabinet and the above-mentioned power unit and triangular transformer compact structure, wherein the above-mentioned power unit and triangular transformer compact structure are arranged in the cabinet. The triangular transformer 100 is back-to-back with the power unit assembly and is arranged at the rear of the cabinet. Figure 7 As shown, the power unit assembly can be placed in the lower part of the front of the cabinet, and the redundant space above the front can be used to install the control box. Figure 8 As shown, the power unit assembly can also be placed above the front of the cabinet, and the redundant space below the front can be used to install the control box. This layout fully utilizes the redundant space of the cabinet and improves space utilization.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. The power unit and the triangular transformer have a compact structure, characterized by: include: A power unit assembly comprises three layers of insulating beams (102) arranged in a vertical direction and a plurality of power units (103) mounted thereon; the power units (103) are arranged in a horizontal array on each layer of insulating beams (102); A triangular transformer (100) is arranged back-to-back with the power unit assembly, and a secondary tap (104) thereof is arranged opposite to the back of the power unit assembly; The connection structure comprises a connection cable (101), wherein the connection cable (101) is led out from the secondary tap (104) of the delta transformer (100), passes through the wire hole (105) on the insulating beam (102), and is directly connected to the input copper piece (106) of the power unit (103).

2. The compact structure of the power unit and the triangular transformer according to claim 1, characterized in that: The power unit assembly is arranged in front of the triangle transformer (100).

3. The compact structure of the power unit and the triangular transformer according to claim 1, characterized in that: At least two insulating beams (102) are provided on each layer, the total number of power units (103) corresponds to a three-phase circuit, and each layer of insulating beams (102) carries a single-phase power unit.

4. The compact structure of the power unit and the triangular transformer according to claim 3, characterized in that: The insulating crossbeam (102) is provided with a wire hole (105) below each power unit (103), and the diameter of the wire hole (105) matches the outer diameter tolerance of the connecting cable (101).

5. The compact structure of power unit and triangular transformer according to claim 4, characterized in that: The insulating crossbeam (102) is molded using SMC insulating material.

6. The compact structure of power unit and triangular transformer according to claim 1, characterized in that: The secondary taps (104) of the triangle transformer (100) are horizontally arranged between the two coils thereof, and each set of secondary taps (104) is correspondingly connected to one power unit (103).

7. The compact structure of power unit and triangular transformer according to claim 1, characterized in that: The secondary taps (104) of the triangle transformer (100) are arranged on the left and right sides of a single coil in a centrally symmetrical manner, and each set of secondary taps (104) is correspondingly connected to one power unit (103).

8. The compact structure of power unit and delta transformer according to claim 6 or 7, characterized in that: The R, S, and T three-phase contacts of each set of secondary taps (104) are arranged in a herringbone shape, and the spacing between adjacent contacts matches the outer diameter of the connecting cable (101).

9. The compact structure of power unit and triangular transformer according to claim 1, characterized in that: The total length of the triangular transformer (100) is less than or equal to the sum of the lengths of the power units (103) on each layer.

10. A high voltage frequency converter, characterized in that: It comprises a cabinet and a power unit and a triangular transformer compact structure according to any one of claims 1 to 9, wherein the power unit and the triangular transformer compact structure are arranged in the cabinet.

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