Cast isolation transformer structure

Abstract

The utility model discloses a pouring isolation transformer structure which comprises a core column, a low-voltage winding and a high-voltage winding, and the low-voltage winding and the high-voltage winding are arranged on the periphery of the core column and are coaxially arranged inside and outside. The heat dissipation air channels are arranged side by side at equal intervals to form a ring shape and used for heat dissipation of the low-voltage winding, the insulating air channels are arranged side by side at equal intervals to form a ring shape and used for isolating the low-voltage winding from the high-voltage winding, and the fixing parts are integrally formed in a casting mode and used for fixing the positions of all parts. The insulating air passage is positioned on the coaxial inner side of the high-voltage winding; and grid plates for improving the structural strength of the transformer are arranged on the wall surfaces of the heat dissipation air passage and the insulating air passage. The transformer has the characteristics of simple structure and low manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of transformer structure especially is a kind of pouring isolation transformer structure. BACKGROUND

[0002] Isolation transformer is a kind of special transformer, its main design purpose is to separate circuit into two independent circuits.This means that isolation transformer can provide power transmission function between two circuits without direct electrical connection.It is usually completed by winding in mutually independent magnetic core.Currently, the known 10kV isolation transformer, primary coil and secondary coil are wound on mold respectively, then through a series of processes such as drying, pouring, curing, coil processing is completed, and then it is sleeved on the core column, fixed by pad and insulating support, and insulation cylinder is additionally installed for primary coil and secondary coil for strengthening insulation, which needs to go through multiple processing procedures, such as high-voltage small-capacity isolation transformer is also processed in the same way.Due to the small size of each component, the process is very complex, which brings great process difficulty to processing.

[0003] Therefore, based on the above technical problems, the application provides an isolation transformer with simple structure and low manufacturing cost. SUMMARY

[0004] The utility model discloses a kind of pouring isolation transformer structures with simple structure and low manufacturing cost, to overcome the deficiency of prior art.

[0005] To achieve the above purpose, the utility model provides a kind of pouring isolation transformer structure, including core column and the low-voltage winding and high-voltage winding of the outer periphery of the core column, the low-voltage winding and high-voltage winding are coaxially arranged inside and outside, further including a plurality of heat dissipation air ducts formed annularly and used for the heat dissipation of the low-voltage winding, insulating air ducts formed annularly and used for isolating the low-voltage winding and high-voltage winding and fixed part integrally cast and used for fixing the position of each component, wherein the heat dissipation air duct is located in low-voltage winding, and the insulating air duct is located at the coaxial inner side of high-voltage winding;Grid plate for increasing the strength of transformer structure is arranged on the wall surface of heat dissipation air duct and insulating air duct.

[0006] Further, it further includes inner insulation cylinder sleeved on the outer periphery of the core column and outer insulation cylinder sleeved on the outer periphery of the transformer.

[0007] Further, the fixed part is integrally cast by epoxy resin.

[0008] Further, the winding direction of the coil of the high-voltage winding is left winding direction.

[0009] Further, the thickness and length of the insulating air duct are greater than the thickness and length of the heat dissipation air duct.

[0010] Furthermore, the low-voltage winding is also provided with vertically arranged insulating tubes.

[0011] Furthermore, the insulation wrapping of the coil leads of the low-voltage winding and the high-voltage winding adopts a half-overlap wrapping method.

[0012] The present invention adopts the above-described solution, and its beneficial effects are as follows:

[0013] By integrally casting and fixing the relevant low-voltage windings and high-voltage windings, it is more suitable for mass production, which reduces production costs and improves the transformer's fire and moisture resistance, thereby ensuring that the overall structure of the transformer is more stable and reliable. Attached Figure Description

[0014] Figure 1 This is a top view of the present invention.

[0015] Figure 2 This is a side sectional view of the present invention.

[0016] Among them, 1-core column, 2-low voltage winding, 21-heat dissipation duct, 3-high voltage winding, 31-insulation duct, 4-fixing part, 5-grid plate, 6-inner insulation cylinder, 7-outer insulation cylinder, 8-insulation tube. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description of it is provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0018] See appendix Figure 1 As shown, in this embodiment, a cast-resin isolation transformer structure includes a core column 1 and a low-voltage winding 2 and a high-voltage winding 3 around the core column 1. The low-voltage winding 2 and the high-voltage winding 3 are arranged coaxially inside and outside the core column 1. The structure also includes multiple parallel and equally spaced ring-shaped heat dissipation channels 21 for heat dissipation of the low-voltage winding 2, parallel and equally spaced ring-shaped insulating channels 31 for isolating the low-voltage winding 2 and the high-voltage winding 3, and a fixing part 4 integrally cast and used to fix the position of each component. The fixing part 4 is cast from epoxy resin.

[0019] See appendix Figure 2As shown, in this embodiment, the heat dissipation duct 21 is located in the low-voltage winding 2, and the insulating duct 31 is located on the coaxial inner side of the high-voltage winding 3. The thickness and length of the insulating duct 31 are greater than the thickness and length of the heat dissipation duct 21. By setting the heat dissipation duct 21 in the low-voltage winding 2, the low-voltage winding 2 can dissipate heat in time during operation, which improves the overall heat dissipation capacity of the transformer. Furthermore, the larger insulating duct 31 on the coaxial inner side of the high-voltage winding 3 further separates the low-voltage winding 2 and the high-voltage winding 3, ensuring that the low-voltage winding 2 and the high-voltage winding 3 can work normally without interfering with each other.

[0020] See appendix Figure 2 As shown in this embodiment, both the heat dissipation duct 21 and the insulation duct 31 are provided with grid plates 5 to increase the structural strength of the transformer. The fixing part 4 formed by the combination of epoxy resin and grid plate 5 has no air bubbles or partial discharge inside, has a high insulation level, and its temperature resistance level can reach "h" level. It not only has high mechanical strength at room temperature, but also has high mechanical strength at high temperature, ensuring that the transformer can operate safely and reliably at high temperature.

[0021] Furthermore, it also includes an inner insulating cylinder 6 sleeved on the outer circumferential surface of the core column 1 and an outer insulating cylinder 7 sleeved on the outer circumferential surface of the transformer.

[0022] In this embodiment, the high-voltage winding 3 is wound in a left-hand direction.

[0023] Furthermore, the low-voltage winding 2 is also equipped with a vertically arranged insulating tube 8.

[0024] Furthermore, the insulation wrapping of the coil leads of the low-voltage winding 2 and the high-voltage winding 3 adopts a half-overlap wrapping method.

[0025] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any modifications or alterations made by those skilled in the art to the technical solution of this utility model without departing from its scope are equivalent embodiments of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from its scope should be covered within the protection scope of this utility model.

Claims

1. A cast isolated transformer structure comprising a core column (1) and a low-voltage winding (2) and a high-voltage winding (3) on the periphery of the core column (1), the low-voltage winding (2) and the high-voltage winding (3) being arranged coaxially inside and outside one another, characterized in that: The transformer further comprises a plurality of heat dissipation air channels (21) arranged in parallel and at equal intervals to form a ring and used for heat dissipation of the low-voltage winding (2), an insulation air channel (31) arranged in parallel and at equal intervals to form a ring and used for insulation of the low-voltage winding (2) and the high-voltage winding (3), and a fixing part (4) integrally cast and used for fixing positions of components, wherein the heat dissipation air channel (21) is located in the low-voltage winding (2), and the insulation air channel (31) is located at the coaxial inner side of the high-voltage winding (3); the heat dissipation air channel (21) and the insulation air channel (31) are both provided with a grid plate (5) on a wall surface thereof, which is used for increasing structural strength of the transformer.

2. A cast pot-type isolating transformer structure according to claim 1, characterized in that: The transformer further comprises an inner insulation cylinder (6) sleeved on an outer circumferential surface of the core column (1) and an outer insulation cylinder (7) sleeved on an outer circumferential surface of the transformer.

3. A cast pot type isolating transformer structure according to claim 1, characterized in that: The fixing part (4) is integrally cast by epoxy resin.

4. The cast isolation transformer structure of claim 1, wherein: The winding direction of the high-voltage winding (3) is left winding direction.

5. The cast isolation transformer structure of claim 1, wherein: The thickness and length of the insulation air channel (31) are greater than the thickness and length of the heat dissipation air channel (21).

6. A cast pot type isolating transformer structure according to claim 1, characterized in that: The low-voltage winding (2) is further provided with an insulation tube (8) arranged vertically.

7. A cast pot type isolating transformer structure according to claim 1, characterized in that: The coil lead-out heads of the low-voltage winding (2) and the high-voltage winding (3) are insulated and wrapped by using a half-layer wrapping method.

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