CN220368595U - Insulation assembly and frequency converter - Google Patents

Abstract

The application provides an insulating assembly and a frequency converter, wherein the insulating assembly is applied to a rectifying device, the rectifying device is connected with a plurality of conductors, the insulating assembly is arranged between a first conductor and the rectifying device, the first conductor is one of the conductors, and at least one of two sides of the first conductor is provided with adjacent conductors; the insulation assembly includes: the insulating paper comprises a bottom plate and two spacers formed by folding the two sides of the bottom plate, the bottom plate is arranged between the first conductor and the rectifying device, and the two spacers are respectively arranged on the two sides of the first conductor; insulating paper fixed bolster sets up between insulating paper and rectifying device, includes: a bottom plate; the first baffle and the second baffle are arranged on two opposite sides of the upper surface of the bottom plate along the width direction of the bottom plate, the first baffle and the second baffle are perpendicular to the upper surface of the bottom plate, and the outer surfaces of the two spacers of the insulating paper are respectively abutted against the inner surfaces of the first baffle and the second baffle.

Description

Insulation assembly and frequency converter

Technical Field

The application relates to the field of frequency converters, and more particularly relates to an insulating assembly and a frequency converter.

Background

The rectifying unit in the frequency converter is connected with other circuit units in the frequency converter through conductors such as copper bars, and the adjacent conductors are electrically isolated due to different potentials, so that risks such as breakdown are prevented.

The isolation between adjacent conductors is generally performed by using insulating paper, for example, by folding the insulating paper into a U-shape, fixing the bottom surface thereof between the conductors and the connection terminals of the rectifying unit, and extending both side surfaces of the insulating paper in a direction perpendicular to the conductors, the height of the side surfaces of the insulating paper being set so as to satisfy the requirements for the creepage distance in the related art. However, in actual use, when environmental factors such as temperature and humidity change, the insulating paper will deform, so that the side surface of the insulating paper is inclined to the side close to the adjacent conductors, which shortens the creepage distance between the conductors, resulting in potential safety hazards.

Disclosure of Invention

The application provides an insulation component and a frequency converter, and various aspects related to embodiments of the application are described below.

In a first aspect, an insulating assembly is provided and applied to a rectifying device, the rectifying device is connected with a plurality of electric conductors, the insulating assembly is arranged between a first electric conductor and the rectifying device, the first electric conductor is one of the plurality of electric conductors, and at least one of two sides of the first electric conductor is provided with adjacent electric conductors; the insulation assembly includes: the insulating paper comprises a bottom plate and two spacers formed by folding the two sides of the bottom plate, the bottom plate is arranged between the first conductor and the rectifying device, and the two spacers are respectively arranged on the two sides of the first conductor; an insulating paper fixing bracket provided between the insulating paper and the rectifying device, comprising: a bottom plate; the first baffle and the second baffle are arranged on two opposite sides of the upper surface of the bottom plate along the width direction of the bottom plate, the first baffle and the second baffle are perpendicular to the upper surface of the bottom plate, and the outer surfaces of the two spacers of the insulating paper are respectively abutted against the inner surfaces of the first baffle and the second baffle.

Optionally, the first baffle and the second baffle extend the length of the entire base plate along the length direction of the base plate.

Optionally, the insulating paper fixed bolster still includes protruding locates first spacing muscle and the second spacing muscle of bottom plate's lower surface, first spacing muscle with the second spacing muscle is embedded into respectively first slot and the second slot that corresponds the setting on the rectifying device.

Optionally, the first limiting rib and the second limiting rib both extend the length of the entire bottom plate along the length direction of the bottom plate.

Optionally, the insulating paper fixing support further includes: the first positioning part and the second positioning part are respectively arranged on two opposite sides of the lower surface of the bottom plate along the length direction, and the first positioning part and the second positioning part are perpendicular to the lower surface of the bottom plate.

Optionally, the insulating paper fixing support includes: and an opening penetrating through the bottom plate along the thickness direction of the bottom plate, wherein the position of the connecting opening corresponds to the position of a connecting piece for connecting the first conductor and the rectifying device.

Optionally, the insulating paper fixing support is made of plastic.

Optionally, the insulating paper fixing support is made by integral molding.

In a second aspect, there is provided a frequency converter comprising: a rectifying device including a plurality of terminals; a plurality of conductors connected to the plurality of terminals, respectively; the insulation assembly according to the first aspect, the insulation assembly being disposed between a first conductor and the rectifying device, wherein the first conductor is one of the plurality of conductors and at least one of both sides of the first conductor is provided with an adjacent conductor.

In the insulation component that this application embodiment provided, utilize the spacer of baffle fixed insulation paper side in the insulation paper fixed bolster for the spacer can't incline to the side under the restraint of fixed bolster, thereby ensures that can keep great creepage distance between the adjacent electric conductor, ensures the electric isolation between the electric conductor.

Drawings

Fig. 1 is a schematic diagram of a manner of disposing insulating paper in a rectifying device in the related art.

Fig. 2 is a schematic diagram of the insulating paper of fig. 1 when deformed.

Fig. 3 is a schematic diagram of another mode of disposing insulating paper in a rectifying device in the related art.

Fig. 4 is a schematic structural view of an insulation assembly provided in an embodiment of the present application.

Fig. 5 is an isometric view of the insulating paper holder of fig. 4 at an angle.

Fig. 6 is an isometric view of the insulating paper holder of fig. 4 from another angle.

Detailed Description

In order to facilitate understanding of the present application, prior art insulation measures of a frequency converter and problems thereof will be illustrated before describing embodiments of the present application.

The frequency converter is a power control device which controls the alternating current motor by changing the frequency of a working power supply of the motor by applying a frequency conversion technology and a microelectronic technology. The frequency converter mainly comprises a rectifying unit, a direct current unit and an inversion unit. Along with the continuous improvement of the industrial automation degree, the special requirements of various production equipment on power supply are also continuously increased, and the frequency converter can adjust the voltage and frequency of an output power supply and provide the required power supply voltage according to the actual requirements of a motor so as to save energy and regulate the speed, so that the frequency converter is increasingly valued in the production field.

The rectifying unit in a frequency converter typically has a plurality of terminals, such as a plurality of input terminals, which may be used to receive input signals of the multiphase alternating current, and a plurality of output terminals, which may include a positive direct current output terminal and a negative direct current output terminal. Each of the plurality of terminals is connected to other circuit units in the frequency converter through a conductor, for example, the plurality of input terminals may be connected to a plurality of power interfaces of the frequency converter through a plurality of conductors, and the plurality of output terminals may be connected to input terminals of the inverter unit through a plurality of conductors, respectively.

The plurality of connection terminals in the rectifying unit are generally arranged in a line so as to be adjacent to each other on the side, and conductors such as copper bars connected correspondingly thereto are also arranged in a line so as to be adjacent to each other; since the potentials of adjacent conductors are typically different, electrical isolation is required to prevent the risk of breakdown or even explosion.

The electrical isolation between adjacent conductors may be achieved by means of insulating paper, which may be folded into a U-shape, for example, with its bottom surface fixed between the conductor and the terminal, with both sides of the insulating paper extending in a direction perpendicular to the conductor. In order to meet the requirements for electrical isolation in the related art standards, there is generally a certain requirement for the height of the edge of the insulating paper after bending, so as to enable a larger creepage distance between adjacent conductors. The manner in which the insulating paper is provided and the problems associated therewith in the related art will be described in detail with reference to fig. 1 to 3.

Fig. 1 shows one way of disposing insulating paper in the related art, and as shown in fig. 1, insulating paper 110 is bent into a U-shape, including a bottom surface 111 and two side surfaces 112 and 113; the conductor 120 is fixed to the terminal of the rectifying unit 140 by the screw 130, the bottom surface 111 of the insulating paper 110 is disposed between the conductor 120 and the rectifying unit 140, and both side surfaces 112 and 113 of the insulating paper 110 extend upward in a direction away from the conductor 120; the two sides 112 and 113 of the insulating paper can increase the creepage distance between the conductor 120 and the conductor 150 adjacent thereto.

The insulating paper 110 in fig. 1 is susceptible to external influences during operation, for example, when the temperature or humidity changes, the insulating paper will deform, for example, referring to fig. 2, the sides 112 and 113 of the insulating paper 110 are inclined to the side close to the adjacent conductors, so that the creepage distance between the adjacent conductors is reduced, and the risk of breakdown is increased.

Fig. 3 is another mode of disposing insulating paper in the related art, which is different from the mode of fig. 1 in that reinforcing parts 315 and 316, which are insulating paper stuck to the outer sides of both side surfaces 312 and 313, are provided on the outer sides of both side surfaces 312 and 313 of the insulating paper 310. In which the insulating papers 315 and 316 protrude downward from the bottom surface 311 of the insulating paper, two grooves 321 and 322 are provided at both sides of the area where the conductor 330 is connected in the rectifying unit 320, and when the insulating paper 310 is further provided between the electric rectifying unit 320 and the conductor 330, the bottom edges of the reinforcing parts 315 and 316 on the insulating paper 310 abut against the grooves 321 and 322, thus increasing the safety distance between the conductors, but since the reinforcing parts 315 and 316 are attached to the side surfaces 312 and 313 of the insulating paper, there is no improvement in the bending property of the insulating paper, and thus there is also a problem in that the safety distance is shortened due to the inclination of the insulating paper to both sides.

In view of the above, embodiments of the present application provide an insulation assembly and a frequency converter to solve the above problems. The insulation assembly provided in the embodiments of the present application will be described in detail with reference to the accompanying drawings.

Fig. 4 is a schematic structural diagram of an insulation assembly 400 according to an embodiment of the present application, where the insulation assembly 400 is applied to a rectifying device, and the rectifying device 210 is partially shown in dotted lines, and the rectifying device 210 is connected to a plurality of electrical conductors.

It should be noted that, in the embodiment of the present application, the number of connection terminals or the number of conductors on the rectifying device 210 is not limited, for example, 3 connection terminals as shown in fig. 4 may be disposed on the rectifying device 210, and the three connection terminals are connected to three conductors 220A, 220B, and 220C, respectively; the number of connection terminals on the rectifying device 210 may be 3 or more, for example, 4 or more.

The insulation assembly 400 is disposed between a first conductor, which is one of a plurality of conductors, and the rectifying device 210, and at least one of both sides of the first conductor is provided with adjacent conductors. For example, when the rectifying device 210 is connected to 3 conductors 220A, 220B, and 220C as shown in fig. 4, the first conductor may be the middle conductor 220B, where adjacent conductors are disposed on both sides of the first conductor. For another example, when the rectifying device is connected to 4 conductors simultaneously, the first conductor may be first and third conductors, where one side of the first conductor is provided with the conductor and both sides of the third conductor are provided with the conductor. Next, the structure of the insulating module 400 in the embodiment of the present application will be described in detail with reference to fig. 4, and fig. 4 is a description of an example in which the rectifying device has 3 terminals.

The insulation assembly in fig. 4 includes an insulation paper 410 and an insulation paper fixing bracket 420.

Wherein the insulating paper 410 comprises a bottom sheet 411 and two spacers 412 and 413 folded on both sides of the bottom sheet 411, the bottom sheet 411 and the two spacers 412 and 413 forming a U-shaped structure.

The insulating paper 410 is preferably formed by folding a single insulating paper sheet, and can prevent the interface between the backsheet 411 and the separator 412 or 413 from generating a gap to affect the insulating performance.

When the insulating paper 410 is mounted on the rectifying assembly, the base sheet 411 is disposed between the first electric conductor 220B and the rectifying device 210, and the two spacers are located on both sides of the first electric conductor 220B, respectively; that is, the first conductive body 220B is positioned in the U-shaped groove of the insulating paper 410, and the spacers 412 and 413 on both sides can increase the distance between the first conductive body 220B and the adjacent conductive bodies 220A and 220C.

The insulating paper fixing support 420 is disposed between the insulating paper 410 and the rectifying device 210, and fig. 5 and 6 are respectively shaft test diagrams of the insulating paper fixing support 420 in fig. 4.

As shown in fig. 4 to 6, the insulating paper holding bracket 420 includes a bottom plate 421. The bottom plate 421 may be a rectangular flat plate as shown in the drawings.

On both sides (a first side 4212 and a second side 4213 shown in the drawing, the first side 4212 and the second side 4213 being two long sides parallel to each other in the bottom plate 421) opposite in the width direction of the upper surface 4211 of the bottom plate 421, a first baffle 422 and a second baffle 423 are provided, the first baffle 422 and the second baffle 423 being perpendicular to the upper surface 4211 of the bottom plate 421; as shown in fig. 4, the outer surfaces of the two spacers 412 and 413 of the insulating paper 410 abut against the inner surfaces of the first barrier 422 and the second barrier 423, respectively.

In the insulation component that this application embodiment provided, utilize the spacer of baffle fixed insulation paper side in the insulation paper fixed bolster for the spacer can't incline to the side under the restraint of fixed bolster, thereby ensures that can keep great creepage distance between the adjacent electric conductor, ensures the electric isolation between the electric conductor.

In some embodiments, as shown in fig. 5, the first and second baffles 422 and 423 on the insulating paper holding support 420 extend the entire length of the bottom plate 421 in the length direction of the bottom plate 421. The lengths of the first shutter 422 and the second shutter 423 are set longer, and it can be ensured that the spacers of the insulating paper can be restrained effectively at any position along the length direction.

In some embodiments, with continued reference to fig. 4-6, the insulating paper holder 420 further includes a first stop rib 424 and a second stop rib 425 protruding from the lower surface 4214 of the bottom plate 421. Correspondingly, the rectifying device 200 further includes a first groove 231 and a second groove 232 corresponding to the first limit rib 424 and the second limit rib 425, and when the insulating paper fixing support 420 is mounted on the rectifying device 200, the first limit rib 424 and the second limit rib 425 can be embedded into the first groove 231 and the second groove 232.

By arranging the limit ribs on the lower surface of the bottom plate, charges in the conductors can be conducted to adjacent conductors only along the lower surface of the bottom plate and the surfaces of the limit ribs; namely, by utilizing the limiting rib, the creepage distance between adjacent conductors is increased.

In some embodiments, with continued reference to fig. 4-6, the first limiting rib 424 and the second limiting rib 425 extend along the length direction of the bottom plate 421 for the entire length of the bottom plate 421, so that the creepage distance between adjacent conductors along the upper surface of the rectifying device 210 can be kept in a larger state at any position along the length direction of the bottom plate 421.

In some embodiments, with continued reference to fig. 5-6, the insulating paper holding stand 420 further includes a first positioning portion 426 and a second positioning portion 427, the first positioning portion 426 and the second positioning portion 427 being disposed on opposite sides of the bottom plate in a length direction in a lower surface of the bottom plate, respectively.

Taking fig. 6 as an example, the first positioning portion 426 is disposed on a third side along the length direction of the bottom plate 421, the third side being one short side of the bottom plate 421, and the first positioning portion 426 is perpendicular to the lower surface 4214 of the bottom plate 421.

The second positioning portion 427 is disposed on a fourth side along the length direction of the bottom plate 421, where the fourth side is parallel to the third side and is the other short side of the bottom plate 421, and the second positioning portion 427 is perpendicular to the lower surface 4214 of the bottom plate 421.

The first positioning portion 426 is shaped to match the second positioning portion 427 such that when two or more insulating paper holding brackets 420 are assembled in sequence in the longitudinal direction, the first positioning portion of an adjacent first insulating paper holding bracket can be fitted with the second mounting portion of the second insulating paper holding bracket to make a tight fit between the first insulating paper holding bracket and the second insulating paper holding bracket.

In some embodiments, as shown in fig. 6, the first positioning portion 426 includes a third baffle 4261, the third baffle 4261 is disposed perpendicular to the lower surface of the bottom plate 421, and a dimension of the third baffle 4261 in the width direction of the bottom plate 421 is denoted as a first distance D1. The second positioning portion 427 includes a fourth blocking plate 4271 and a fifth blocking plate 4272, where the fourth blocking plate 4271 and the fifth blocking plate 4272 are also perpendicular to the lower surface 4214 of the bottom plate 421, and the fourth blocking plate 4271 and the fifth blocking plate 4272 have two opposite sides 42711 and 42721, respectively, a distance between the two sides is denoted as a second distance D2, and the first distance D1 is less than or equal to the second distance D2, so that the third blocking plate 4261 of one insulating paper fixing support can be inserted into a gap between the fourth blocking plate 4271 and the fifth blocking plate 4272 of the other insulating paper fixing support, and the two insulating paper fixing supports can be tightly fitted.

As described above, the rectifying device 210 and the plurality of conductors are implemented by a plurality of terminals provided on the rectifying device, that is, the terminals are connected to the conductors by the connection members; and the insulating paper fixing support 420 is fixed between the rectifying device 210 and the electric conductor; in some embodiments, an opening 4217 is provided in the bottom plate 421 through which the connector can pass to conduct the electrical conductor to the rectifying device.

The hole 4217 may be, for example, a rectangular hole as shown in the drawings, or may be a hole of another shape such as a circular shape, which is not limited in the embodiment of the present application.

In some embodiments, the insulating paper fixing support 420 may be made of an insulating material, which may be, for example, plastic or resin, etc.

In some embodiments, the insulating paper holder 420 is made in an integrally formed manner, such as injection molding or 3D printing.

The embodiment of the application also provides a frequency converter, which comprises a rectifying device, wherein the rectifying device comprises a plurality of terminals; a plurality of conductors connected to the plurality of terminals, respectively; an insulating assembly as described in any of the preceding embodiments, the insulating assembly being disposed between a first electrical conductor and the rectifying device, wherein the first electrical conductor is one of a plurality of electrical conductors and at least one of two sides of the first electrical conductor is provided with an adjacent electrical conductor. The insulation component can increase the creepage distance between adjacent conductors and ensure electrical isolation.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (9)

1. An insulating assembly for use in a rectifying device connected to a plurality of electrical conductors, characterized in that,

the insulation component is arranged between a first conductor and the rectifying device, the first conductor is one of the plurality of conductors, and at least one of two sides of the first conductor is provided with adjacent conductors;

the insulation assembly includes:

the insulating paper comprises a bottom plate and two spacers formed by folding the two sides of the bottom plate, the bottom plate is arranged between the first conductor and the rectifying device, and the two spacers are respectively arranged on the two sides of the first conductor;

an insulating paper fixing bracket provided between the insulating paper and the rectifying device, comprising:

a bottom plate;

the first baffle and the second baffle are arranged on two opposite sides of the upper surface of the bottom plate along the width direction of the bottom plate, the first baffle and the second baffle are perpendicular to the upper surface of the bottom plate, and the outer surfaces of the two spacers of the insulating paper are respectively abutted against the inner surfaces of the first baffle and the second baffle.

2. The insulation assembly of claim 1, wherein the first baffle and the second baffle extend the length of the entire base plate along the length of the base plate.

3. The insulation assembly according to claim 2, wherein the insulation paper fixing support further comprises a first limit rib and a second limit rib protruding from the lower surface of the bottom plate, and the first limit rib and the second limit rib are respectively embedded into a first groove and a second groove which are correspondingly arranged on the rectifying device.

4. The insulation assembly of claim 3, wherein the first and second stop bars each extend the length of the entire base plate along the length of the base plate.

5. The insulation assembly of claim 4, wherein the insulation paper mounting bracket further comprises:

the first positioning part and the second positioning part are respectively arranged on two opposite sides of the lower surface of the bottom plate along the length direction, and the first positioning part and the second positioning part are perpendicular to the lower surface of the bottom plate.

6. The insulation assembly of any one of claims 1-5, wherein the insulation paper mounting bracket comprises:

and an opening penetrating through the bottom plate along the thickness direction of the bottom plate, wherein the position of the connecting opening corresponds to the position of a connecting piece for connecting the first conductor and the rectifying device.

7. The insulation assembly of any one of claims 1-5, wherein the insulation paper mounting bracket is made of plastic.

8. The insulation assembly of claim 7, wherein the insulation paper fixing bracket is manufactured by integral molding.

9. A frequency converter, comprising:

a rectifying device including a plurality of terminals;

a plurality of conductors connected to the plurality of terminals, respectively;

the insulation assembly of any of claims 1-8, disposed between a first electrical conductor and the rectifying device, wherein the first electrical conductor is one of the plurality of electrical conductors and at least one of two sides of the first electrical conductor is provided with an adjacent electrical conductor.