CN219164424U

CN219164424U - Variable-current power module

Info

Publication number: CN219164424U
Application number: CN202222742273.6U
Authority: CN
Inventors: 赵中亭; 齐红柱; 陈斌; 张紫阳; 王伟名
Original assignee: Henan Senyuan Electric Co Ltd
Current assignee: Henan Senyuan Electric Co Ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2023-06-09
Anticipated expiration: 2032-10-18

Abstract

The utility model relates to the field of direct current converter stations, in particular to a variable current power module. The variable current power module comprises a shell, a first variable current power unit and a second variable current power unit which are arranged left and right, wherein the shell comprises a first metal shell and a second metal shell which are arranged left and right, and the first metal shell is fixedly connected with the second metal shell through an insulating connecting piece so as to realize the insulation of the first metal shell and the second metal shell; the first variable current power unit is fixed on the first metal shell, and the second variable current power unit is fixed on the second metal shell. The first metal shell and the second metal shell of the variable-current power module are made of metal materials, so that the structural strength of the shell structure of the variable-current power module is enhanced, and the problem of low structural strength of the shell structure of the existing power module is solved.

Description

Variable-current power module

Technical Field

The utility model relates to the field of direct current converter stations, in particular to a variable current power module.

Background

The power cabinet of the high-voltage converter device is generally formed by cascading a plurality of variable-current power units, the variable-current power units are numerous, and in order to ensure that enough electrical safety distance exists between the power units, the whole variable-current power cabinet is large in size, so that the problems of large occupied area, high cost and the like of the power cabinet are caused.

The Chinese patent of the utility model with the publication number of CN106159964B discloses a power module, which comprises a first basic power unit and a second basic power unit, wherein each basic power unit comprises a capacitor, a radiator and two IGBTs, the two IGBTs in each power unit are connected in series, the two IGBTs in the first basic power unit are connected in series or in parallel with the two IGBTs in the second basic power unit, the power module further comprises an outer frame, the two basic power units are accommodated in the outer frame, and the size and the volume of a power cabinet can be reduced on the premise that the power cabinet with the same capacity is adopted by integrating the two basic power units in one power module. The first basic power unit and the second basic power unit are current-variable power units, and the outer frame is a shell.

According to the power module, the two variable-current power units are integrated in the same power module, so that the size and the volume of the power cabinet are reduced, and in order to ensure the insulation performance, the shell of the power module is made of an insulation material, and the strength of the shell of the insulation material is poor and is easy to deform.

Disclosure of Invention

The utility model aims to provide a variable-current power module which is used for solving the problem of low structural strength of an existing power module shell.

The technical scheme of the variable-current power module is as follows:

the variable current power module comprises a shell, a first variable current power unit and a second variable current power unit which are arranged left and right, wherein the shell comprises a first metal shell and a second metal shell which are arranged left and right, and the first metal shell is fixedly connected with the second metal shell through an insulating connecting piece so as to realize the insulation of the first metal shell and the second metal shell; the first variable current power unit is fixed on the first metal shell, and the second variable current power unit is fixed on the second metal shell.

The beneficial effects are that: the shell of the current-converting power module comprises a first metal shell and a second metal shell, wherein the first current-converting power unit is fixed on the first metal shell, the second current-converting power unit is fixed on the second metal shell, the shell of the current-converting power module further comprises an insulating connecting piece, and the insulating connecting piece is used for connecting the first metal shell with the second metal shell so as to realize insulation of the first metal shell and the second metal shell, and the first metal shell and the second metal shell are made of metal materials, so that the structural strength of the shell of the current-converting power module is enhanced.

Further, the first metal shell and the second metal shell each comprise a vertical plate and a bottom plate, the insulating connecting piece comprises a front end plate, a rear end plate and a bottom plate insulating piece which is used for connecting the bottom plate of the first metal shell and the bottom plate of the second metal shell, and the first metal shell, the second metal shell, the front end plate, the rear end plate and the bottom plate insulating piece enclose a containing groove for containing the first variable-current power unit and the second variable-current power unit.

The beneficial effects are that: the front end plate, the rear end plate and the bottom plate insulating piece are all made of insulating materials, so that the insulating effect between the first variable-current power unit and the second variable-current power unit is improved.

Further, the first metal shell is provided with an upper cross brace fixed with the upper part of the front end plate, and one end of the upper cross brace is fixed with the vertical plate.

The beneficial effects are that: the setting of going up the stull is convenient for front end plate, back end plate and first metal casing, second metal casing's connection, and the structural strength of being connected between front end plate, back end plate and the two metal casings has been strengthened in the setting of going up the stull.

Further, the insulating connector further comprises a top insulating cover plate for covering the notch of the accommodating groove.

The beneficial effects are that: the arrangement of the top insulating cover plate enables the two variable current power units to be wrapped by the shell, and the protection effect on the two variable current power units is better.

Further, the first metal shell and the second metal shell both comprise bottom plates, the insulating connecting piece comprises a bottom plate insulating piece, the cross section of the bottom plate insulating piece is T-shaped, the bottom plate insulating piece comprises a transverse insulating plate and a vertical insulating plate, the transverse insulating plate is connected with the bottom plates of the first metal shell and the bottom plates of the second metal shell, and the vertical insulating plate isolates the bottoms of the first variable-current power unit and the second variable-current power unit.

The beneficial effects are that: the creepage distance between two current transformation power units is increased by the arrangement of the bottom plate insulating piece, so that the distance between the two current transformation power units can be reduced, and the size of the whole current transformation power module is reduced.

Further, the bottom surfaces of the transverse insulating plates are flush with the bottom surfaces of the first metal shell and the second metal shell.

The beneficial effects are that: by adopting the arrangement, the surface of the shell of the variable-current power module is smooth, and the installation of the variable-current power module is facilitated.

Further, the first variable current power unit comprises a radiator and a capacitor, the radiator extends back and forth, the capacitor is located between the radiator and the vertical plate, radiating holes for radiating the capacitor are formed in the vertical plate, and radiating holes for radiating the radiator are formed in the front end plate and the rear end plate.

The beneficial effects are that: the heat dissipation efficiency of the capacitor and the radiator is improved by the arrangement of the heat dissipation holes and the heat dissipation openings, so that the temperature rise of the capacitor and the radiator is reduced.

Further, the first variable current power unit still includes the PCB board, and the riser of first metal casing, second metal casing is connected with insulating backup pad, and the PCB board sets up in insulating backup pad, and insulating backup pad is located the top of electric capacity, is equipped with the ventilation hole to PCB board heat dissipation on the insulating apron in top.

The beneficial effects are that: the arrangement of the vent holes improves the heat dissipation efficiency of the PCB, and is beneficial to reducing the temperature rise of the PCB.

Further, insulating pressing strips are arranged on the front end plate and the rear end plate and used for pressing the radiator.

The beneficial effects are that: the arrangement of the insulating pressing strips improves the connection reliability between the radiator and the bottom plate, so as to avoid the phenomenon that the radiator is separated from the bottom plate.

Further, the inside U-shaped support that is provided with of riser, U-shaped support include upper and lower parallel arrangement's upper and lower curb plate, and insulating backup pad is connected with the upper curb plate of U-shaped support, the lower curb plate of U-shaped support and the top surface butt of electric capacity.

The beneficial effects are that: the arrangement of the U-shaped support not only can realize connection between the insulating support plate and the vertical plate, but also improves the reliability of connection between the capacitor and the bottom plate, so as to avoid the phenomenon that the capacitor is separated from the bottom plate.

Drawings

Fig. 1 is a schematic structural diagram of a current transformer power module according to embodiment 1 of the present utility model after a top insulating cover plate is hidden;

FIG. 2 is a cross-sectional view at A-A in FIG. 1;

FIG. 3 is a partial enlarged view at B in FIG. 2;

fig. 4 is a schematic structural diagram of another view angle of the current transformer power module according to embodiment 1 of the present utility model after the top insulating cover plate is hidden;

fig. 5 is a schematic diagram of an internal structure of a variable current power module according to embodiment 1 of the present utility model;

fig. 6 is a schematic structural diagram of an embodiment 1 of a variable current power module according to the present utility model;

fig. 7 is a schematic structural diagram of a bottom structure of a variable current power module according to embodiment 1 of the present utility model;

fig. 8 is a schematic structural diagram of a first metal housing in an embodiment 1 of a variable current power module according to the present utility model.

In the figure: 1. a riser; 2. a bottom plate; 3. a heat sink; 4. an IGBT module; 5. a capacitor; 6. laminating a busbar; 601. a flat plate body; 602. a connecting arm; 7. binding posts; 8. a tray; 9. a switching power supply; 10. a PCB board; 11. a flexible connection row; 12. a connecting plate; 13. a front end plate; 14. a rear end plate; 15. a base plate insulator; 151. a transverse insulating plate; 152. vertical insulating plates; 16. a top insulating cover plate; 17. a Z-shaped bending structure; 171. first vertical bending; 172. a second vertical bending; 173. transversely bending; 18. an upper cross brace; 19. a reinforcing plate; 20. an insulating layering; 21. a U-shaped bracket; 22. a heat radiation hole; 23. a heat radiation port; 24. a vent hole; 25. a handle; 26. an insulating support plate; 27. a first metal housing; 28. a second metal housing; 29. a first variable current power unit; 30. and a second variable current power unit.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The features and capabilities of the present utility model are described in further detail below in connection with the examples.

Embodiment 1 of the variable current power module of the present utility model:

as shown in fig. 1 to 8, the variable current power module of the present utility model includes a housing, a first variable current power unit 29 and a second variable current power unit 30, the housing includes a first metal housing 27 and a second metal housing 28 arranged left and right, the first variable current power unit 29 is fixed on the first metal housing 27, the second variable current power unit 30 is fixed on the second metal housing 28, and the first metal housing 27 and the second metal housing 28 are fixedly connected through an insulating connector to realize insulation between the first metal housing 27 and the second metal housing 28. In this embodiment, the housing has a symmetrical structure, and the first variable current power unit 29 and the second variable current power unit 30 are symmetrically arranged in the housing.

Taking the first metal housing 27 and the first variable current power unit 29 as an example, the first metal housing 27 includes a riser 1 and a base plate 2, and the first variable current power unit 29 is arranged on the base plate 2.

The first variable current power unit 29 includes a radiator 3, IGBT modules 4 and a capacitor 5, the radiator 3 extends back and forth along the length direction of the base plate 2, two IGBT modules 4 are provided, and are disposed on the radiator 3 at intervals along the extending direction of the radiator 3, and the radiator 3 is used for radiating heat to the IGBT modules 4. The capacitors 5 are provided in plurality and are arranged between the riser 1 and the radiator 3 along the length direction of the bottom plate 2. The first converter power unit 29 further includes a laminated busbar 6, where the laminated busbar 6 includes a flat plate 601 and a connecting arm 602, the flat plate 601 of the laminated busbar 6 is disposed on top of the capacitor 5 and electrically connected to the capacitor 5, and two connecting arms 602 of the laminated busbar 6 are respectively electrically connected to the terminals 7 disposed on one IGBT module 4, so as to realize electrically conductive connection between the capacitor 5 and the IGBT module 4.

A tray 8 is fixedly arranged on the bottom plate 2, and the capacitor 5 and the radiator 3 are fixed on the tray 8. The tray 8 is Z-shaped integrally, so that the tray 8 comprises two bearing plates with height difference, the radiator 3 is fixed on the higher bearing plate, the capacitor 5 is fixed on the lower bearing plate, the arrangement is that the top surfaces of the capacitor 5 and the IGBT module 4 on the radiator 3 are positioned at the same height, and unnecessary bending can be reduced when the laminated busbar 6 is connected with the capacitor 5 and the radiator 3.

The first variable current power unit 29 further comprises a switching power supply 9, a PCB board 10 and a flexible connection row 11, the switching power supply 9 and the PCB board 10 are arranged on an insulating support plate 26, the insulating support plate 26 is located above the laminated busbar 6, and the first variable current power unit is connected with the riser 11 through a plurality of U-shaped supports 21 arranged on the inner side of the riser 1, and the U-shaped supports 21 are arranged at intervals along the length direction of the riser 1. Specifically, the U-shaped bracket 21 includes an upper side plate and a lower side plate, the insulating support plate 26 is connected with the upper side plate of the U-shaped bracket 21, and the lower side plate of the U-shaped bracket 21 abuts against the top surface of the capacitor 5. One of the two IGBT modules 4 of the first variable current power unit 29 is connected to the flexible connection row 11, and the other is connected to the IGBT module 4 of the second variable current power unit 30 via the connection board 12, so as to realize the series connection of the two variable current power units. Specifically, one end of the flexible connection row 11 is connected with the IGBT module 4, and the other end is used as an outlet end of the variable current power unit.

The insulating connection comprises a front end plate 13, a rear end plate 14, a base plate insulator 15 connecting the base plate 2 of the first metal housing 27 and the base plate 2 of the second metal housing, the front end plate 13, the rear end plate 14, the first metal housing 27, the second metal housing 28 and the base plate insulator 15 enclosing a receiving slot for receiving the first variable current power unit 29 and the second variable current power unit 30. The insulating connecting piece further comprises a top insulating cover plate 16, and the top insulating cover plate 16 is used for covering the notch of the containing groove, so that the two variable current power units are wrapped by the shell, and the protection effect on the two variable current power units is better.

As shown in fig. 2 and 3, the cross section of the base plate insulating member 15 is T-shaped, and includes a transverse insulating plate 151 and a vertical insulating plate 152, where the transverse insulating plate 151 connects the base plate 2 of the first metal housing 27 and the base plate 2 of the second metal housing 28, and the vertical insulating plate 152 extends along the length direction of the base plate 2 to isolate the bottoms of the first variable current power unit 29 and the second variable current power unit 30, and the arrangement of the base plate insulating member 15 increases the creepage distance between the two variable current power units, so that the distance between the two variable current power units can be reduced, and thus the volume of the whole variable current power module is reduced.

More specifically, as shown in fig. 8, a zigzag bending structure 17 is disposed at the connection position between the bottom plate 2 and the bottom plate insulator 15, the zigzag bending structure 17 includes a first vertical bend 171, a second vertical bend 172 and a lateral bend 173, when the bottom plate 2 and the bottom plate insulator 15 are in a connection state, the second vertical bend 172 is parallel to and spaced from the vertical insulating plate 152 of the bottom plate insulator 15, and the lateral bend 173 is attached to the lateral insulating plate 151 of the bottom plate insulator 15, so that the bottom surface of the lateral insulating plate 151 is flush with the bottom surface of the bottom plate 2. By adopting the arrangement, the surface of the shell of the variable-current power module is smooth, and the installation is convenient.

In the present embodiment, the front end plate 13, the rear end plate 14, the top insulating cover plate 16 and the bottom insulating member 15 are made of insulating materials, and with this arrangement, the insulating effect between the first variable current power unit 29 and the second variable current power unit 30 is improved, and the first metal housing 27 and the second metal housing 28 are made of metal materials, so that the structural strength of the entire housing is improved, and deformation is not easily generated. In addition, the riser 1 is provided with an upper cross brace 18, and one end of the upper cross brace 18 is fixed with the riser 1 and the other end is overhanging. The arrangement of the upper cross braces 18 not only facilitates the fixed connection of the front end plate 13 and the rear end plate 14 with the two metal shells, but also strengthens the structural strength of the connection between the front end plate 13 and the rear end plate 14 and the two metal shells. In particular, since the front end plate 13 is provided with the pull tab 25, in order to further strengthen the structural strength of the connection of the front end plate 13 with the two metal cases, the upper cross brace 18 connected with the front end plate 13 is provided with the reinforcing plate 19.

In order to improve the strength of the fixed connection between the first variable current power unit 29 and the second variable current power unit 30 and the bottom plate 2, so as to avoid the phenomenon that the parts of the two variable current power units are loosened from the bottom plate 2, insulating pressing strips 20 are arranged on the inner sides of the front end plate 13 and the rear end plate 14, and the insulating pressing strips 20 are used for pressing the radiator 3. In addition, the lower side plate of the U-shaped bracket 21 is abutted with the top surface of the capacitor 5 and used for pressing the capacitor 5.

The shell of the variable-current power module is provided with a heat dissipation structure for dissipating heat inside the shell. A plurality of heat dissipation holes 22 are formed in the vertical plate 1, the heat dissipation holes 22 are distributed along the length direction of the vertical plate 1, and the heat dissipation holes 22 are mainly used for naturally dissipating heat of the capacitor 5; the front end plate 13 and the rear end plate 14 are provided with heat dissipation openings 23, and the heat dissipation openings 23 are mainly used for forced air cooling and heat dissipation of the radiator 3; the top insulating cover plate 16 is provided with a plurality of ventilation holes 24, and the ventilation holes 24 are mainly used for naturally radiating heat of the PCB 10 and the switching power supply 9.

The first variable current power unit 29 and the second variable current power unit 30 of the novel variable current power module are respectively fixed on the first metal shell 27 and the second metal shell 28, the two metal shells are connected through the insulating connecting piece to realize insulation, and the variable current power module integrates the two variable current power units in the same variable current power module, so that the size and the volume of the power cabinet are reduced, and meanwhile, the structural strength of the shell is also improved.

In the embodiment 2 of the current-converting power module of the present utility model, unlike the embodiment 1 described above, the housing of the current-converting power module includes two U-shaped metal cases, the insulating connecting member is an annular insulating member, and the annular insulating member connects the two U-shaped metal cases to achieve insulation between the two metal cases. In other embodiments, the insulating top cover may be replaced with a metal cover that includes two symmetrical portions and is connected by an insulator.

In embodiment 3 of the variable current power module of the present utility model, unlike embodiment 1 described above, the first metal case includes only the bottom plate, and the riser is made of an insulating material and is fixed to the bottom plate by bolts.

In the embodiment 4 of the variable current power module of the present utility model, unlike the embodiment 1 described above, the first metal housing and the second metal housing are not provided with upper cross braces, the front end face and the rear end face of the two metal housings are provided with connecting plates, and the front end plate and the rear end plate are connected with the two metal housings through the connecting plates.

In embodiment 5 of the variable current power module of the present utility model, unlike embodiment 1 described above, the base plate insulator includes only the vertical insulating plate, and the first metal shell is connected to the second metal shell through the vertical insulating plate.

In embodiment 6 of the variable current power module of the present utility model, the transverse insulating plates are located outside the bottom plates of the first metal case and the second metal case, unlike embodiment 1 described above.

In embodiment 7 of the variable current power module of the present utility model, unlike embodiment 1 described above, the riser is not provided with heat dissipation holes, and heat dissipation is performed only through the heat dissipation holes in the front and rear end plates.

In the embodiment 8 of the variable current power module of the present utility model, unlike the embodiment 1 described above, insulating beads are not provided on the front and end plates, and the radiator is fixed to the base plate only by the tray.

In embodiment 9 of the variable current power module of the present utility model, unlike embodiment 1 described above, the bottom plate of the U-shaped bracket does not abut the top surface of the capacitor, and the capacitor is fixed to the bottom only by the tray.

The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The variable-current power module is characterized by comprising a shell, a first variable-current power unit (29) and a second variable-current power unit (30) which are arranged left and right, wherein the shell comprises a first metal shell (27) and a second metal shell (28) which are arranged left and right, and the first metal shell (27) and the second metal shell (28) are fixedly connected through an insulating connecting piece so as to realize insulation of the first metal shell (27) and the second metal shell (28); the first variable current power unit (29) is fixed on the first metal shell (27), and the second variable current power unit (30) is fixed on the second metal shell (28).

2. The variable current power module according to claim 1, characterized in that the first metal housing (27) and the second metal housing (28) each comprise a riser (1) and a bottom plate (2), the insulating connection comprises a front end plate (13), a rear end plate (14), a bottom plate insulation (15) connecting the bottom plate (2) of the first metal housing (27) with the bottom plate (2) of the second metal housing (28), the first metal housing (27), the second metal housing (28), the front end plate (13), the rear end plate (14) and the bottom plate insulation (15) enclosing a receiving slot accommodating the first variable current power unit (29) and the second variable current power unit (30).

3. A variable current power module according to claim 2, characterized in that the first metal housing (27) is provided with an upper cross-brace (18) fixed to the upper part of the front end plate (13), one end of the upper cross-brace (18) being fixed to the riser (1).

4. The variable current power module of claim 2, wherein the insulating connector further comprises a top insulating cover plate (16), the top insulating cover plate (16) being adapted to cover the slot opening of the receiving slot.

5. The variable current power module according to claim 1, wherein the first metal housing (27) and the second metal housing (28) each comprise a bottom plate (2), the insulating connection member comprises a bottom plate insulating member (15), the cross section of the bottom plate insulating member (15) is T-shaped, the bottom plate insulating member (15) comprises a transverse insulating plate (151) and a vertical insulating plate (152), the transverse insulating plate (151) is connected with the bottom plates (2) of the first metal housing (27) and the bottom plates (2) of the second metal housing (28), and the vertical insulating plate (152) isolates the bottoms of the first variable current power unit (29) and the second variable current power unit (30).

6. The variable current power module according to claim 5, wherein the bottom surface of the transverse insulating plate (151) is flush with the bottom surfaces of the bottom plates (2) of the first metal housing (27) and the second metal housing (28).

7. A variable current power module according to claim 2, 3 or 4, characterized in that the first variable current power unit (29) comprises a radiator (3) and a capacitor (5), the radiator (3) extends back and forth, the capacitor (5) is located between the radiator (3) and a riser (1), the riser (1) is provided with a heat dissipation hole (22) for dissipating heat of the capacitor (5), and the front end plate (13) and the rear end plate (14) are provided with heat dissipation holes (23) for dissipating heat of the radiator (3).

8. The variable current power module according to claim 7, characterized in that the first variable current power unit (29) further comprises a PCB board (10), the risers (1) of the first metal housing (27) and the second metal housing (28) are connected with an insulating support board (26), the PCB board (10) is arranged on the insulating support board (26), the insulating support board (26) is located above the capacitor (5), and the top insulating cover board (16) is provided with a vent hole (24) for dissipating heat of the PCB board (10).

9. The variable current power module according to claim 7, characterized in that the front end plate (13) and the rear end plate (14) are provided with insulating beads (20), and the insulating beads (20) are used for pressing the radiator (3).

10. The variable current power module according to claim 8, characterized in that a U-shaped bracket (21) is arranged on the inner side of the vertical plate (1), the U-shaped bracket (21) comprises an upper side plate and a lower side plate which are arranged in parallel up and down, an insulating support plate (26) is connected with the upper side plate of the U-shaped bracket (21), and the lower side plate of the U-shaped bracket (21) is abutted with the top surface of the capacitor (5).