Shielding structure for auxiliary winding of phase-shifting transformer

Abstract

The utility model discloses a phase-shifting transformer auxiliary winding shielding structure which comprises insulating plates, a plurality of limiting grooves are formed in each insulating plate at intervals, auxiliary winding coils or secondary coils are contained in the limiting grooves at the same height, the auxiliary winding coils are installed in the limiting grooves at the bottommost end, and the secondary coils are installed in the limiting grooves at the bottommost end. A circle of shielding layer is wound on the outer surface of the auxiliary winding coil, comb teeth are arranged on the bottom wall of the limiting groove in the bottommost end, and the comb teeth are detachably connected to the bottom end of the insulating plate. The auxiliary winding coil is installed in the limiting groove in the bottommost end of the insulating plate, and the detachable comb teeth are arranged on the bottom wall of the corresponding limiting groove, so that the auxiliary winding coil can be taken down from the insulating plate, a circle of shielding layer can be conveniently wound on the outer surface of the auxiliary winding coil, and the production efficiency is greatly improved; and compared with the prior art that a concentric ring-shaped copper strip only shields the upper surface of the auxiliary winding coil, the shielding effect is better.

Description

Technical Field

[0001] This utility model relates to the field of phase-shifting transformer technology, specifically a shielding structure for the auxiliary winding of a phase-shifting transformer. Background Technology

[0002] Phase-shifting transformers, as a green, environmentally friendly, and energy-saving power supply component, are playing an increasingly important role. As a crucial part of the entire frequency conversion system, phase-shifting transformers are increasingly responsible for providing power to other equipment and ensuring system stability. The phase-shifting transformer connects to the control unit via its auxiliary winding coil. To prevent external magnetic fields from interfering with the control unit's signal, stable and efficient shielding is required for the auxiliary winding coil.

[0003] Currently, the shielding of the auxiliary winding coil of traditional phase-shifting transformers is mostly achieved by placing copper strips directly on the surface of the coil, and the copper strips are mostly concentric rings similar in shape to the coil.

[0004] This approach has the following main drawbacks:

[0005] (1) Copper strips are mostly in the shape of concentric rings, which are complicated to process and will cause material waste during the process;

[0006] (2) In practice, if the copper strip is too hard, the edge of the copper strip is easy to lift up, which makes the insulation distance between the copper strip and the secondary coil above insufficient, resulting in voltage breakdown.

[0007] (3) Placing copper strips on the upper surface of the coil shields only the upper surface of the auxiliary winding coil, while the external magnetic field can still interfere with it through the side and lower surface of the auxiliary winding coil. Utility Model Content

[0008] The purpose of this invention is to improve and innovate upon the shortcomings and problems existing in the background technology, and to provide a shielding structure for the auxiliary winding of a phase-shifting transformer.

[0009] A shielding structure for an auxiliary winding of a phase-shifting transformer includes an insulating cylinder. The outer surface of the insulating cylinder has a ring array of several insulating plates. Each insulating plate has several spaced-apart limiting slots. An auxiliary winding coil or a secondary coil is accommodated in each limiting slot at the same height. The auxiliary winding coil is installed in the lowest limiting slot. A shielding layer is wound around the outer surface of the auxiliary winding coil. The bottom wall of the lowest limiting slot is configured as comb teeth, which are detachably connected to the bottom of the insulating plate. The comb teeth support the auxiliary winding coil. The bottom of the insulating plate is supported on an insulating support.

[0010] A further option is to fix the comb teeth to the bottom end of the insulating plate by bolts.

[0011] A further embodiment is that the shielding layer includes an insulating paper layer and an aluminum tape layer, with the insulating paper layer positioned between the auxiliary winding coil and the aluminum tape layer.

[0012] A further option is to use double-layer NOMEX paper to wind one loop around each part of the auxiliary winding coil, with adjacent NOMEX papers overlapping each other by 1 / 2.

[0013] A further option is that the aluminum tape layer is wound around the auxiliary winding coil from the starting end once and then back to the starting end. The aluminum tape layer is selected with a thickness of 0.02-0.04mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model installs the auxiliary winding coil in the limiting groove at the bottom of the insulating plate, and the bottom wall of the corresponding limiting groove is set as comb teeth. The comb teeth are detachably connected to the bottom of the insulating plate, so that the auxiliary winding coil can be removed from the insulating plate, which facilitates the winding of a shielding layer on the outer surface of the auxiliary winding coil, greatly improving production efficiency. At the same time, the shielding layer shields the upper surface, lower surface and side of the auxiliary winding coil. Compared with the concentric ring-shaped copper strip of the prior art, which only shields the upper surface of the auxiliary winding coil, this application has a better shielding effect. In addition, the comb teeth are detachably connected to the bottom of the insulating plate by bolts. The use of bolt connection structure allows the auxiliary winding coil to be removed and wrapped as a whole without changing the overall support strength. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the auxiliary winding shielding structure of a phase-shifting transformer provided in an embodiment of the present invention;

[0017] Figure 2 Provided for the embodiments of this utility model Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0018] Reference numerals in the attached diagram: 1. Auxiliary winding coil; 2. Secondary coil; 3. Insulating cylinder; 4. Insulating plate; 41. Limiting groove; 5. Insulating support; 6. Comb teeth; 7. Bolt. Detailed Implementation

[0019] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figures 1-2 This utility model provides a shielding structure for the auxiliary winding of a phase-shifting transformer, including an insulating cylinder 3. The outer surface of the insulating cylinder 3 has a ring array of several insulating plates 4. Each insulating plate 4 has several limiting grooves 41 spaced apart along its height. An auxiliary winding coil 1 or a secondary coil 2 is accommodated in each limiting groove 41 at the same height. The auxiliary winding coil 1 is only installed in the bottom limiting groove 41, while the secondary coil 2 is installed in the other limiting grooves 41. A shielding layer is wound around the outer surface of the auxiliary winding coil 1. The bottom wall of the bottom limiting groove 41 is configured as comb teeth 6, which are detachably connected to the bottom end of the insulating plate 4. Preferably, the comb teeth 6 are fixedly connected to the bottom end of the insulating plate 4 by bolts 7. The upper surface of the comb teeth 6 supports the auxiliary winding coil 1, and the bottom end of the insulating plate 4 and the lower surface of the comb teeth 6 are supported on an insulating support 5, without changing the overall support strength. Since the comb teeth 6 are detachably connected to the insulating plate 4, and the auxiliary winding coil 1 is installed in the bottommost limiting groove 41, the auxiliary winding coil 1 can be removed after the comb teeth 6 are removed from the insulating plate 4. This facilitates the winding of a shielding layer around the outer surface of the auxiliary winding coil 1. Since the shielding layer completely covers the outer surface of the auxiliary winding coil 1, it achieves shielding of the upper surface, lower surface, and sides of the auxiliary winding coil 1. Compared with the existing technology where the concentric ring-shaped copper strip pad is placed on the auxiliary winding coil 1, which only shields the upper surface of the auxiliary winding coil 1, the shielding effect of this application is better.

[0023] Specifically, the shielding layer includes an insulating paper layer and an aluminum tape layer, with the insulating paper layer positioned between the auxiliary winding coil 1 and the aluminum tape layer. The insulating paper layer provides insulation, while the aluminum tape layer provides shielding, preventing external magnetic fields from interfering with the signal of the auxiliary winding coil 1. The insulating paper layer is wound with double-layered NOMEX paper around the circumference of the auxiliary winding coil 1, with adjacent NOMEX sheets overlapping each other by half. That is, first, a turn of NOMEX paper is wound at a certain point on the auxiliary winding coil 1, and then another turn is wound at an adjacent point, with adjacent NOMEX sheets overlapping by half their width, until double-layered NOMEX paper is wound around the circumference of the auxiliary winding coil 1. The aluminum tape layer is wound around the auxiliary winding coil 1 from the starting end and then back to the starting end. The aluminum tape layer is made of aluminum tape with a thickness of 0.02-0.04mm. Due to the stickiness and plasticity of the aluminum tape, it can quickly wind a shielding layer around the auxiliary winding coil 1, resulting in high shielding layer winding efficiency.

[0024] It should be noted that after the insulating paper layer is wound on the outer surface of the auxiliary winding coil 1, the entire auxiliary winding coil 1 is immersed in the insulating varnish. After the insulating varnish is cured, the aluminum tape layer is wrapped around it. The insulating varnish can fill the gaps between the NOMEX paper, enhance the insulation strength of the insulating paper layer, and basically eliminate the risk of insulation breakdown.

[0025] In summary, this utility model installs the auxiliary winding coil 1 in the limiting groove 41 at the bottom of the insulating plate 4, and the bottom wall of the corresponding limiting groove 41 is set as comb teeth 6. The comb teeth 6 are detachably connected to the bottom of the insulating plate 4, so that the auxiliary winding coil 1 can be removed from the insulating plate 4, which facilitates the winding of a shielding layer around the outer surface of the auxiliary winding coil 1. Due to the optimized wrapping method of the shielding layer, the production efficiency is greatly improved. At the same time, the shielding layer shields the upper surface, lower surface and side of the auxiliary winding coil 1. Compared with the concentric ring-shaped copper strip of the prior art, which only shields the upper surface of the auxiliary winding coil 1, the shielding effect of this application is better. In addition, the comb teeth 6 are detachably connected to the bottom of the insulating plate 4 by bolts 7. The use of bolt connection structure allows the auxiliary winding coil to be removed and wrapped as a whole without changing the overall support strength.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A shielding structure for the auxiliary winding of a phase-shifting transformer, characterized in that: The device includes an insulating cylinder (3), and the outer surface of the insulating cylinder (3) is arranged in a ring array with several insulating plates (4). Each insulating plate (4) is provided with several limiting grooves (41) spaced apart. The limiting grooves (41) at the same height accommodate an auxiliary winding coil (1) or a secondary coil (2). The auxiliary winding coil (1) is installed in the bottom limiting groove (41). The outer surface of the auxiliary winding coil (1) is wound with a shielding layer. The bottom wall of the bottom limiting groove (41) is set as a comb tooth (6). The comb tooth (6) is detachably connected to the bottom end of the insulating plate (4). The comb tooth (6) is used to support the auxiliary winding coil (1). The bottom end of the insulating plate (4) is supported on an insulating support (5).

2. The shielding structure for the auxiliary winding of a phase-shifting transformer according to claim 1, characterized in that: The comb teeth (6) are fixedly connected to the bottom end of the insulating plate (4) by bolts (7).

3. The shielding structure for the auxiliary winding of a phase-shifting transformer according to claim 1, characterized in that: The shielding layer includes an insulating paper layer and an aluminum tape layer, wherein the insulating paper layer is located between the auxiliary winding coil (1) and the aluminum tape layer.

4. The shielding structure for the auxiliary winding of a phase-shifting transformer according to claim 3, characterized in that: The insulating paper layer is wound with double-layer NOMEX paper around the circumference of the auxiliary winding coil (1), and adjacent NOMEX papers overlap each other by 1 / 2.

5. The shielding structure for the auxiliary winding of a phase-shifting transformer according to claim 3, characterized in that: The aluminum tape layer is wound around the auxiliary winding coil (1) from the starting end and then returns to the starting end. The aluminum tape layer is selected with a thickness of 0.02-0.04mm.

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