Low-temperature-rise transformer with pouring structure

Abstract

The utility model discloses a low temperature rise pouring structure transformer which comprises a pouring coil, four longitudinal large air channels are arranged in the pouring coil, the pouring coil comprises an upper section coil and a lower section coil, and the inner wall of the upper section coil is connected with the inner wall of the lower section coil through a transverse baffle. Gaps among the upper-section coil, the lower-section coil and the transverse baffle form an annular air hole channel, and the bottom of the pouring coil is connected with a circle of conical closed coaming. According to the utility model, the effective area of heat conduction is increased, the frictional resistance and the shape resistance of the heat dissipation air passage are greatly reduced, the cooling effect under the self-cooling state and the guide air circulation condition of the transformer is obviously improved, the aging process of an insulating material is effectively delayed, and the stability, the reliability and the safety of the operation of the cast transformer are ensured.

Description

Technical Field

[0001] The utility model relates to the field of transformers, in particular to a transformer with a low-temperature rise casting structure. Background Art

[0002] Epoxy-cast dry-type transformers, due to their lightweight, environmentally friendly, and maintenance-free performance advantages, are widely used in various fields, including residential power distribution, rail transit, and wind and solar energy storage. Resin coils offer excellent electrical and mechanical strength, but these coils restrict heat dissipation, severely obstruct air intake holes, and create high air resistance in the heat convection path. This results in high transformer operating temperatures, accelerated insulation aging, and frequent overheating and short-circuit failures. Utility Model Content

[0003] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a low-temperature cast structure transformer in view of the shortcomings of the existing technology.

[0004] In order to solve the above technical problems, the utility model discloses a low-temperature-rise cast structure transformer, including a cast coil, wherein four large longitudinal air ducts are provided inside the cast coil, the cast coil includes an upper coil and a lower coil, the inner walls of the upper coil and the lower coil are connected by a transverse baffle, and the gap between the upper coil, the lower coil and the transverse baffle forms an annular air hole channel, and a circle of conical closed enclosure is connected to the bottom of the cast coil.

[0005] In the utility model, the cross section of the casting coil is an elliptical structure, and four large longitudinal air ducts are provided.

[0006] In the utility model, the bottom of the casting coil is mounted on four resin blocks, and the resin blocks and the longitudinal large air ducts are arranged in a staggered manner.

[0007] In the utility model, the conical closed enclosure is inclined toward the inner upper portion.

[0008] In the utility model, the ratio of the height of the annular air hole channel to the height of the casting coil is 3:4.

[0009] In the utility model, the conical closed enclosure is inclined toward the inner upper portion.

[0010] In the present invention, the longitudinal large air duct includes two symmetrically arranged long side air ducts 2a and two symmetrically arranged arc-shaped air ducts 2b.

[0011] Beneficial effects of the utility model: The utility model increases the effective area of heat conduction, greatly reduces the friction resistance and shape resistance of the heat dissipation air duct, significantly improves the cooling effect of the transformer under the self-cooling state and guided air circulation conditions, effectively delays the aging process of the insulation material, and ensures the stability, reliability and safety of the cast transformer operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more apparent.

[0013] Figure 1 It is a schematic diagram of the overall structure;

[0014] Figure 2 It is the front view of the casting coil;

[0015] Figure 3 It is a schematic diagram of the three-dimensional structure of the casting coil;

[0016] Figure 4 This is a schematic diagram of the layout of the longitudinal large air duct on the casting coil.

[0017] The reference numerals in the figure are: 1. casting coil, 2. longitudinal large air duct, 3. annular air hole channel, 4. conical closed enclosure, 5. resin block, 6. lower clamp, 7. side end plate, 8. core yoke, 9. upper clamp. DETAILED DESCRIPTION Example

[0018] like Figure 1 、 Figure 2 and Figure 3 This embodiment provides a low-temperature-rise cast structure transformer, including a cast coil 1, wherein four large longitudinal air ducts 2 are provided inside the cast coil, and the cast coil includes an upper coil 1a and a lower coil 1b. The inner walls of the upper coil and the lower coil are connected by a transverse baffle 1c. The gap between the upper coil, the lower coil and the transverse baffle forms an annular air pore channel 3, and the bottom of the cast coil is connected to a circle of conical closed enclosure 4. The cross section of the cast coil is an elliptical structure, and there are four large longitudinal air ducts. The bottom of the cast coil is mounted on four resin blocks 5, and the resin blocks are staggered with the longitudinal air ducts. The upper coil, the lower coil and the transverse baffle are an integrated structure. The ratio of the height of the annular air pore channel to the height of the cast coil is 3:4. The conical closed enclosure is inclined toward the inner upper part.

[0019] like Figure 4 The large longitudinal airway includes two symmetrically arranged long side airways 2a and two symmetrically arranged arc-shaped airways 2b.

[0020] Specifically, the transformer adjusts the airway setting of the existing conventional epoxy transformer cast coil, uses a whole bent steel plate to replace multiple pieced-together airway rods, and forms a completely through-the-air large longitudinal airway 2; during molding, a transverse enclosure is welded on the casting outer mold, and an annular airway 3 is formed at the 3 / 4 position of the vertical height of the outer wall of the casting coil from bottom to top; at the same time, the fixed position of the resin gasket is adjusted, and the lower clamp 6, the side end plate 7 and the iron core yoke 8 are used as the bearing surface to support the cast coil 1.

[0021] Furthermore, the cast coil 1 utilizes bent steel plates instead of multiple assembled airway rods to form four longitudinal large airways 3 symmetrically distributed in the front, back, left and right directions.

[0022] Furthermore, the casting coil 1 is formed with a transverse baffle welded on the inner wall of the casting outer mold, thereby forming an annular air hole channel 3 on the outer wall of the coil.

[0023] Furthermore, the cast coil 1 is welded with a circle of conical closed panels 4 at the bottom of the inner casting mold, so that the insulation at the lower end of the coil is expanded in a bell-shaped manner.

[0024] Furthermore, the contact position between the resin block and the lower end surface of the casting coil 1 does not cover the airway hole of the longitudinal large airway 2 .

[0025] This embodiment discloses a low-temperature cast structure transformer, comprising an iron core, upper and lower clamps, a cast coil, a resin block, and a side end plate. The transformer uses the iron core as a supporting skeleton. In the horizontal direction, the lower clamps are clamped on both sides of the lower end of the iron core, and the side end plates are tightened by bolts installed. The upper end is tightened by side screws installed by the upper clamp 9. In the vertical direction, the three columns of the iron core are concentrically fitted with a cast coil, and the lower end face of each cast coil is padded with four resin blocks, which are supported on the end faces of the lower yoke of the iron core and the side baffles. This embodiment increases the heat conduction area of the iron core and the coil by adjusting the cast coil structure and changing the fixed position of the resin block, greatly reducing the friction resistance and shape resistance of the heat dissipation air duct, effectively improving the heat exchange efficiency between the winding and the cold air under the self-cooling state of the transformer and the guided wind circulation conditions, and significantly reducing the operating temperature rise of the transformer.

[0026] The large longitudinal air ducts of the cast coils avoid the defects of traditional air ducts that form a thin resin film inside the air ducts when using air duct rods for casting, effectively reducing the shape resistance of the cooling guide airflow. Utilizing the reserved intervals between segments during electromagnetic wire winding, a circular air duct is reserved at 3 / 4 of the coil's height, reducing the frictional resistance of the cooling airflow heat exchange. This ensures smooth flow of the guide air circulation airflow through the lower turns of the annular air duct, while the upper turns rely on the residual pressure of the lower airflow to promote self-circulation and cooling. The arrangement of the bell-shaped opening at the lower end prevents the weakening of thermal conductivity due to an excessively thick resin layer. At the same time, by adjusting the fixed position of the resin block, it increases the inlet cross-section of the guide cooling airflow entering the cast coil air duct. The increase in heat transfer area and the enhancement of air convection effectively reduce the operating temperature of the cast transformer, improving its operating efficiency and service life. This has significant advantages in reducing energy consumption, avoiding environmental pollution, and ensuring safe production.

[0027] This utility model provides a concept and method for a low-temperature cast-structure transformer. There are many methods and approaches to implement this technical solution. The above is only a preferred embodiment of the utility model. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the utility model, and such improvements and modifications should also be considered within the scope of protection of the utility model. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A low temperature rise cast structure transformer, characterized in that: The invention comprises a casting coil (1), wherein four longitudinal large air ducts (2) are provided inside the casting coil (1), the casting coil comprises an upper coil (1a) and a lower coil (1b), the inner walls of the upper coil (1a) and the lower coil (1b) are connected by a transverse baffle (1c), and the gap between the upper coil (1a), the lower coil (1b) and the transverse baffle (1c) forms an annular air hole channel (3), and the bottom of the casting coil is connected to a circle of conical closed enclosure (4).

2. A low temperature rise cast structure transformer according to claim 1, characterized in that: The cross section of the casting coil (1) is an elliptical structure, and four large longitudinal air ducts (2) are provided.

3. The low-temperature cast structure transformer according to claim 2, characterized in that: The bottom of the casting coil (1) is mounted on four resin blocks (5), and the resin blocks (5) and the longitudinal large air ducts (2) are arranged in an interlaced manner.

4. The low-temperature cast structure transformer according to claim 3, characterized in that: The upper coil (1a), the lower coil (1b) and the transverse baffle (1c) are an integrated structure.

5. The low-temperature cast structure transformer according to claim 1, characterized in that: The ratio of the height of the annular air hole channel (3) to the height of the casting coil (1) is 3:

4.

6. The low-temperature cast structure transformer according to claim 1, characterized in that: The conical closed enclosure (4) is inclined toward the inner upper portion.

7. The low-temperature cast structure transformer according to claim 1, characterized in that: The longitudinal large air passage (2) comprises two symmetrically arranged long side air passages (2a) and two symmetrically arranged arc-shaped air passages (2b).

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