CN114520200A - High-strength insulating baffle for power module of flexible direct-current converter valve - Google Patents

Abstract

The invention discloses a high-strength insulating baffle for a flexible-straight converter valve power module, which comprises a baffle frame and a reinforcing fin, wherein the baffle frame comprises a top connecting plate, two side connecting plates and a bottom reinforcing rib plate, two ends of the top connecting plate are respectively connected with the upper ends of the two side connecting plates, two ends of the bottom reinforcing rib plate are respectively connected with the lower ends of the two side connecting plates, the plate surface of the top connecting plate is vertical to the plate surface of the bottom reinforcing rib plate, and the top connecting plate, the two side connecting plates and the bottom reinforcing rib plate jointly enclose to form a sleeving space; the reinforcing fins are located on two sides of the baffle frame and connected with the side connecting plates, and the reinforcing fins extend along the length direction of the side connecting plates. The high-strength insulating baffle plate is connected with the power module radiator, so that the high-strength insulating baffle plate can be quickly mounted and dismounted. By adopting the polymer integrated forming process and controlling the length and the proportion of the glass fibers in the polymer, the structural strength is improved and the blast force impact is effectively resisted while the electrical performance is ensured.

Description

A high-strength insulating baffle for flexible DC converter valve power module

technical field

The invention relates to the technical field of flexible-to-DC converter valves, in particular to a high-strength insulating baffle for a power module of a flexible-to-DC converter valve.

Background technique

In the field of flexible direct current transmission, the converter valve is composed of many IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) power modules. Under special fault conditions (such as overvoltage of the power module, mis-closing of the bypass switch, etc.), the IGBT device will break down and cause the device to explode, and the instantaneous blasting airflow will splash with the material inside the device or the casing. The splash has high kinetic energy under the action of blasting force, and if it is ejected from the power module, it may affect the normal operation of other modules. The current common practice in the industry is to use a metal or insulating panel to completely cover the module head.

The scheme of covering all the module heads of the flexible DC converter valve has the disadvantage that the panel will not only expand the volume of the entire power module, but also increase the difficulty and time-consuming of module maintenance, which is not conducive to on-site operation and maintenance and observation of component status.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a high-strength insulating baffle for the power module of the flexible-DC converter valve, which is small in size and covers the head of the intermediate radiator of the flexible-DC converter valve alone, so as to realize Quick installation and disassembly, avoid increasing the volume of the flexible DC converter valve, do not affect the maintenance and state observation of the flexible DC converter valve, while ensuring the electrical performance, improve the strength of the structural parts, and can effectively resist the impact of blasting force.

The technical scheme of the present invention is: a high-strength insulating baffle for a flexible DC converter valve power module, comprising a baffle frame and reinforcing fins, and the baffle frame includes a top connecting plate, two side connecting plates and a bottom reinforcing plate Rib plate, the two ends of the top connecting plate are respectively connected with the upper ends of the two side connecting plates, the two ends of the bottom reinforcing rib plate are respectively connected with the lower ends of the two side connecting plates, and the plate surface of the top connecting plate is connected with the bottom reinforcing rib plate. The plate surfaces are perpendicular to each other, and the top connecting plate, the two side connecting plates and the bottom reinforcing rib plate are jointly enclosed to form a socket space;

The reinforcing fins are located on both sides of the baffle frame, the reinforcing fins are connected with the side connecting plates, and the reinforcing fins are extended along the length direction of the side connecting plates.

The flexible-DC converter valve power module of the present invention uses a high-strength insulating baffle, and the baffle frame is mounted on the middle radiator of the flexible-DC converter valve power module, wherein the top connecting plate abuts on the top of the middle radiator, and the two The side connecting plates are respectively abutted to both sides of the middle radiator, the bottom reinforcing rib plate is abutted to the front surface of the middle radiator, and the baffle frame is sleeved to the middle radiator from the front end of the middle radiator, and then fixed. , easy to install and disassemble, at the same time, the bottom reinforcing rib plate is fixed with the front end surface of the middle radiator, which reduces the volume of the baffle frame in the up and down direction, strengthens the fins to shield the IGBT module, and improves the strength of the structural parts while ensuring the electrical performance. It can effectively resist the impact of blasting force.

Further, the connection between the bottom reinforcing rib plate and the side connecting plate adopts an inclined transition, and the connection between the bottom reinforcing rib plate and the side connecting plate forms an obtuse angle greater than 120°. It can effectively improve the structural strength of the connection between the bottom reinforcing rib plate and the side connecting plate.

Further, the flexible DC converter valve power module includes two side radiators, a middle radiator and two IGBTs, the two IGBTs jointly clamp the middle radiator, and the two side radiators are respectively located outside the two IGBTs, blocking the The plate frame is sleeved to the end of the middle radiator, the middle radiator enters the sleeve space, and the reinforcing fins cover the IGBTs on both sides of the middle radiator.

Further, the top connecting plate is provided with a first bolt hole, the bottom reinforcing rib plate is provided with a second bolt hole, the axis of the first bolt hole is perpendicular to the axis of the second bolt hole, and the middle radiator corresponds to the first bolt respectively. The holes and the second bolt holes are provided with mounting holes. The baffle frame is bolted to the intermediate radiator for easy installation and removal.

Further, the reinforcing fins include a fin transverse plate and a fin vertical plate, one end of the fin transverse plate is vertically connected with the plate surface of the side connecting plate, the fin transverse plate extends along the length direction of the side connecting plate, and the fins extend along the length direction of the side connecting plate. The vertical plate is vertically connected with the horizontal plate of the fin. The finned horizontal plate and the finned vertical plate cover the IGBT, which can resist the impact of explosive force.

Further, a circular arc transition is adopted at the connection between the fin cross plate and the side connecting plate. Strengthen the connection strength of the connection between the fin cross plate and the side connecting plate.

Further, the relationship between the number N of the vertical fins and the length A of the horizontal fins is N=A/2.2.

Further, the ratio of the width B1 of the fin lateral plate to the width B2 of the fin vertical plate is B1:B2=(8-12):(2-3), and B2 is greater than 2 mm.

Further, the baffle frame and the reinforcing fins are integrally formed with a polymer, and the polymer includes glass fiber and epoxy resin or unsaturated resin.

Further, the length of the glass fibers is 25-35 mm, and the proportion of the glass fibers in the polymer is 30-40%. By controlling the length and proportion of glass fiber in the polymer, the strength of the structural parts can be improved while ensuring the electrical performance, which can effectively resist the impact of blasting force.

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

The high-strength insulating baffle for the flexible-DC converter valve power module of the present invention is connected with the power module radiator to realize rapid installation and disassembly. Using the polymer integrated molding process, by controlling the length and proportion of glass fiber in the polymer, while ensuring the electrical performance, the strength of the structural parts is improved, and the impact of blasting force can be effectively resisted.

Description of drawings

FIG. 1 is a schematic structural diagram of a high-strength insulating baffle for a flexible DC converter valve power module according to the present invention.

FIG. 2 is a schematic diagram of the assembly of the high-strength insulating baffle plate and the flexible DC converter valve power module of the present invention.

3 is a cross-sectional view of the high-strength insulating baffle of the present invention.

Side radiator 1, middle radiator 2, IGBT3, baffle frame 4, top connecting plate 41, first bolt hole 411, side connecting plate 42, bottom reinforcing rib plate 43, second bolt hole 431, socket space 44, Reinforcing fins 5 , fin horizontal plates 51 , and fin vertical plates 52 .

Detailed ways

The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

Example

As shown in FIG. 1 , this embodiment provides a high-strength insulating baffle for a flexible DC converter valve power module, including a baffle frame and reinforcing fins.

As shown in Figure 2, the flexible DC valve power module includes two side radiators 1, a middle radiator 2 and two IGBTs 3. The two IGBTs jointly clamp the middle radiator, and the two side radiators are located in the two IGBTs respectively. the outer side.

As shown in FIGS. 1 and 2 , the baffle frame 4 includes a top connecting plate 41 , two side connecting plates 42 and a bottom reinforcing rib plate 43 , two ends of the top connecting plate are respectively connected with the upper ends of the two side connecting plates, and the bottom The two ends of the reinforcing rib plate are respectively connected with the lower ends of the two side connecting plates, the plate surface of the top connecting plate and the plate surface of the bottom reinforcing rib plate are perpendicular to each other, and the top connecting plate, the two side connecting plates and the bottom reinforcing rib plate are jointly enclosed A socket space 44 is formed.

As shown in Figures 1 and 2, the connection between the bottom stiffening rib plate and the side connecting plate adopts an inclined transition, and the connection between the bottom stiffening rib plate and the side connecting plate forms an obtuse angle greater than 120°, which can effectively improve the relationship between the bottom stiffening rib plate and the side connecting plate. Structural strength of the junctions of the side connecting plates.

As shown in Figures 1 and 2, the baffle frame is sleeved to the end of the middle heat sink, the middle heat sink enters the sleeve space, and the reinforcing fins cover the IGBTs on both sides of the middle heat sink. The top connecting plate is provided with a first bolt hole 411, the bottom reinforcing rib plate is provided with a second bolt hole 431, the axis of the first bolt hole is perpendicular to the axis of the second bolt hole, and the middle radiator corresponds to the first bolt hole and the second bolt hole respectively. The second bolt hole is provided with a mounting hole. The baffle frame is bolted to the intermediate radiator for easy installation and removal.

As shown in FIG. 1 and FIG. 3 , the reinforcing fin 5 includes a fin horizontal plate 51 and a fin vertical plate 52 . The length direction of the connecting plate extends, and the fin vertical plate is vertically connected with the fin horizontal plate. The connection between the fin cross plate and the side connecting plate adopts arc transition. The finned horizontal plate and the finned vertical plate cover the IGBT, which can resist the impact of explosive force.

The relationship between the number N of vertical fins and the length A of the horizontal fins is N=A/2.2. In this embodiment, A is 4.4 mm, and N is 2. The ratio of the width B1 of the fin lateral plate to the width B2 of the fin vertical plate is B1:B2=(8-12):(2-3), and B2 is greater than 2 mm. In this embodiment, B2 is 2.5 mm, and B1 is 10 mm.

The baffle frame and reinforcing fins are made from one piece of polymer, including glass fiber and epoxy or unsaturated resin. The length of the glass fibers is 25-35mm, and the proportion of glass fibers in the polymer is 30-40%. By controlling the length and proportion of glass fiber in the polymer, the strength of the structural parts can be improved while ensuring the electrical performance, which can effectively resist the impact of blasting force. In this embodiment, the length of the glass fibers is 30 mm, and the proportion of the glass fibers in the polymer is 35%.

The flexible-DC converter valve power module of the present invention uses a high-strength insulating baffle, and the baffle frame is mounted on the middle radiator of the flexible-DC converter valve power module, wherein the top connecting plate abuts on the top of the middle radiator, and the two The side connecting plates are respectively abutted to both sides of the middle radiator, the bottom reinforcing rib plate is abutted to the front surface of the middle radiator, and the baffle frame is sleeved to the middle radiator from the front end of the middle radiator, and then fixed. , easy to install and disassemble, at the same time, the bottom reinforcing rib plate is fixed with the front end surface of the middle radiator, which reduces the volume of the baffle frame in the up and down direction, strengthens the fins to shield the IGBT module, and improves the strength of the structural parts while ensuring the electrical performance. It can effectively resist the impact of blasting force.

As described above, the present invention can be well realized, and the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention; It is covered by the scope of protection of the claims of the present invention.

Claims (10)

1. A high-strength insulating baffle for a power module of a flexible-straight converter valve is characterized by comprising a baffle frame and reinforcing fins, wherein the baffle frame comprises a top connecting plate, two side connecting plates and a bottom reinforcing rib plate, two ends of the top connecting plate are respectively connected with the upper ends of the two side connecting plates, two ends of the bottom reinforcing rib plate are respectively connected with the lower ends of the two side connecting plates, the plate surface of the top connecting plate is perpendicular to the plate surface of the bottom reinforcing rib plate, and the top connecting plate, the two side connecting plates and the bottom reinforcing rib plate jointly enclose to form a sleeving space;

the reinforcing fins are located on two sides of the baffle frame and connected with the side connecting plates, and the reinforcing fins extend along the length direction of the side connecting plates.

2. The high-strength insulating baffle for the power module of the soft direct converter valve according to claim 1, wherein the joint of the bottom reinforcing rib plate and the side connecting plate adopts an inclined transition, and an obtuse angle of more than 120 degrees is formed at the joint of the bottom reinforcing rib plate and the side connecting plate.

3. The high-strength insulating baffle plate for the flexible-straight converter valve power module as claimed in claim 1, wherein the flexible-straight converter valve power module comprises two side radiators, a middle radiator and two IGBTs, the two IGBTs clamp the middle radiator together, the two side radiators are respectively positioned at the outer sides of the two IGBTs, the baffle plate frame is sleeved to the end part of the middle radiator, the middle radiator enters the sleeving space, and the reinforcing fins cover the IGBTs at the two sides of the middle radiator.

4. The high-strength insulating baffle plate for the power module of the Rou-straight converter valve according to claim 3, wherein a first bolt hole is formed in the top connecting plate, a second bolt hole is formed in the bottom reinforcing rib plate, the axis of the first bolt hole is perpendicular to the axis of the second bolt hole, and mounting holes are formed in the middle radiator corresponding to the first bolt hole and the second bolt hole respectively.

5. The high-strength insulating baffle for the power module of the Rough DC converter valve as claimed in claim 1, wherein the reinforcing fins comprise fin transverse plates and fin vertical plates, one ends of the fin transverse plates are vertically connected with the surfaces of the side connecting plates, the fin transverse plates extend along the length direction of the side connecting plates, and the fin vertical plates are vertically connected with the fin transverse plates.

6. The high-strength insulating baffle for the power module of the flexible straight converter valve according to claim 5, wherein the connecting part of the fin transverse plate and the side connecting plate adopts an arc transition.

7. The high strength insulating baffle for a FLC converter valve power module as recited in claim 5, wherein the relationship between the number N of the fin risers and the fin cross plate length A is N ═ A/2.2.

8. The high strength insulating barrier for a vdc converter valve power module according to claim 5, wherein the ratio of the fin cross plate width B1 to the fin riser width B2 is B1: B2 ═ 8-12: 2-3, and B2 is greater than 2 mm.

9. The high strength insulating barrier for a vdc converter valve power module according to claim 1, wherein said barrier frame and reinforcing fins are integrally formed from a polymer comprising glass fibers and epoxy or unsaturated resin.

10. The high strength insulation barrier for a limp-to-straight converter valve power module according to claim 9, wherein the length of the glass fiber is 25-35mm, and the ratio of the glass fiber to the polymer is 30-40%.

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