Insulation structure of high-voltage transformer

Abstract

The insulation structure of the high-voltage transformer comprises a high-voltage coil framework and an outer shell, the high-voltage coil framework is arranged on the outer side of a low-voltage coil framework in a sleeved mode, and the outer shell wraps the outer side of the high-voltage coil framework. A low-voltage insulation cavity is formed between a low-voltage coil wound on the low-voltage coil framework and the inner hole wall of the high-voltage coil framework; a high-voltage insulation cavity is formed between the high-voltage coil wound on the high-voltage coil framework and the inner cavity wall of the outer shell; a transition cavity is formed between the end face of the high-voltage coil framework and the inner cavity wall of the outer shell, and wire end insulation cavities corresponding to a plurality of pins are formed in the outer shell. The outer shell and the high-voltage coil framework are provided with a pouring gate penetrating through the outer shell and the high-voltage coil framework, the pouring gate is communicated to the low-voltage insulation cavity, and the low-voltage insulation cavity is communicated with the high-voltage insulation cavity and the wire end insulation cavity through the transition cavity. The insulating property between the high-voltage coil and the low-voltage coil of the high-voltage transformer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an insulation structure of a high-voltage transformer. Background Art

[0002] A high-voltage transformer is a transformer that converts low voltage into high voltage. It consists of an iron core and high and low voltage coils. Usually, the high-voltage coil and the low-voltage coil are wound on the same frame and isolated by common insulation means, such as multiple layers of insulating tape. Due to its short service life, the insulation is poor, and after long-term use, there are safety hazards such as short circuit, overload, current leakage, and arc discharge. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an insulation structure for a high-voltage transformer, which improves the insulation between the high-voltage and low-voltage coils of the high-voltage transformer and between the two.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides an insulation structure of a high-voltage transformer, comprising a low-voltage coil skeleton, a high-voltage coil skeleton and an outer shell, wherein the high-voltage coil skeleton is sleeved on the outside of the low-voltage coil skeleton, and the outer shell is wrapped around the outside of the high-voltage coil skeleton; a low-voltage insulation cavity is formed between the low-voltage coil wound on the low-voltage coil skeleton and the inner hole wall of the high-voltage coil skeleton; a high-voltage insulation cavity is formed between the high-voltage coil wound on the high-voltage coil skeleton and the inner cavity wall of the outer shell; a transition cavity is formed between the end face of the high-voltage coil skeleton and the inner cavity wall of the outer shell, and a wire end insulation cavity corresponding to a plurality of pins is provided in the outer shell; the outer shell and the high-voltage coil skeleton are provided with a gate passing through the two, and the gate is connected to the low-voltage insulation cavity, and the low-voltage insulation cavity is connected to the high-voltage insulation cavity and the wire end insulation cavity through the transition cavity.

[0005] Furthermore, a plurality of the pins are arranged on the high-voltage coil skeleton and are respectively located on both side vertical surfaces of the two ends thereof.

[0006] Furthermore, a supporting end plate is provided at the end of the high-voltage coil skeleton, the outer annular surface of the supporting end plate is in contact with the inner wall of the outer shell, the supporting end plate separates the transition cavity and the high-voltage insulation cavity, and the vertical surfaces on both sides of the supporting end plate are respectively provided with slots, and the transition cavity is connected to the high-voltage insulation cavity through the slots.

[0007] Furthermore, the pin is fixedly arranged on one side of the notch, the wire end insulation cavity is arranged around the outside of the pin, and the wire end insulation cavity is communicated with the notch.

[0008] Furthermore, a plurality of partitions are arranged in the winding area of the high-voltage coil skeleton, and the partitions divide the high-voltage insulation cavity into a plurality of annular cavities; a notch is provided on the edge of the partition for connecting the annular cavities on both sides thereof.

[0009] Furthermore, the notches on adjacent partitions are symmetrically arranged relative to the central axis of the annular cavity.

[0010] Beneficial Effects: The insulation structure of a high-voltage transformer of the present invention is achieved by separately winding high-voltage and low-voltage coils, placing them opposite each other, and then completely isolating the high-voltage and low-voltage coils by externally covering them with a housing and filling them with an insulating medium. The high-voltage and low-voltage coils are each wrapped in the insulating medium, ensuring insulation between the high-voltage and low-voltage coils and between them. This improves the insulation of the entire high-voltage transformer and ensures its electrical safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic axial cross-sectional view of the overall structure of an embodiment of the present utility model;

[0012] Figure 2 This is a schematic cross-sectional view of the end structure of an embodiment of the present utility model;

[0013] Figure 3 This is a schematic diagram of the internal structure of an embodiment of the present utility model. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] As attached Figure 1-3 The insulation structure of a high-voltage transformer includes a low-voltage coil skeleton 1, a high-voltage coil skeleton 2 and an outer shell 3, wherein the high-voltage coil skeleton 2 is sleeved on the outside of the low-voltage coil skeleton 1, and the outer shell 3 is wrapped around the outside of the high-voltage coil skeleton 2; a low-voltage insulation cavity 4 is formed between the low-voltage coil wound on the low-voltage coil skeleton 1 and the inner hole wall of the high-voltage coil skeleton 2; a high-voltage insulation cavity 5 is formed between the high-voltage coil wound on the high-voltage coil skeleton 2 and the inner cavity wall of the outer shell 3; a transition cavity 6 is formed between the end face of the high-voltage coil skeleton 2 and the inner cavity wall of the outer shell 3, and a line end insulation cavity 8 corresponding to a plurality of pins 7 is provided in the outer shell 3; the outer shell 3 and the high-voltage coil skeleton 2 are provided with a gate 9 passing through the two, and the gate 9 is connected to the low-voltage insulation cavity 4, and the low-voltage insulation cavity 4 is connected to the high-voltage insulation cavity 5 and the line end insulation cavity 8 through the transition cavity 6.

[0016] The insulating medium is poured in from the gate and filled with the low-voltage insulation cavity, transition cavity, high-voltage insulation cavity and wire end insulation cavity in sequence, so that the high-voltage coil, low-voltage coil and the wire end wound on the pin are all immersed and wrapped in the insulating medium, and the insulating medium adopts a commonly used potting glue. In this scheme, the high-voltage coil and the low-voltage coil are first wound on the corresponding coil skeleton respectively, and then the high-voltage coil skeleton and the low-voltage coil skeleton are relatively set, so that the main parts of the high-voltage coil and the low-voltage coil are separated by the inside and outside of the skeleton to achieve basic insulation. In order to prevent the conductive medium from entering between the coils and causing conduction, an outer shell is added and the insulating medium is filled in the gap to achieve complete insulation. Among them, the end face of the low-voltage coil skeleton is in contact with the inner wall surface of the outer shell, and the low-voltage coil skeleton is provided with a socket 11 for inserting the iron core along the axial direction. The outer shell is provided with an opening 31 corresponding to the port of the socket, so that from the surface of the outer shell, only the socket for inserting the iron core and the end with the pin extending therefrom are left. Under the double protection of the outer shell and the insulating medium, the internal coil is completely isolated from the external medium. Due to the separate winding of the inside and outside, the high and low voltage coils are completely isolated, thereby effectively improving the insulation of the high and low voltage coils of the high-voltage transformer and the mutual insulation between the two.

[0017] Since the winding parts of the high and low voltage coils are supported by the skeleton structure to achieve absolute separation between the inside and the outside, insulation is inevitably guaranteed, but the wire ends need to be led out of the skeleton and the pins for winding. If the pins are arranged in a concentrated manner, it is easy to cause short circuit or overload due to being too close to each other, causing safety problems. Therefore, multiple pins 7 are arranged on the high-voltage coil skeleton 2, and are respectively located on the vertical surfaces on both sides of its two ends. The wire end of the low-voltage coil extends from the port of the low-voltage insulation cavity 4, deflected to one side, passes through the transition cavity and extends into the wire end insulation cavity 8 on this side, and completes the winding relative to the pin therein, while the wire end of the high-voltage coil extends from the port of the high-voltage insulation cavity, deflected to the other side, and completes the winding with the pin. First, the wire ends of the two coils extend from the inside and outside of the high-voltage coil skeleton respectively, and are deflected to opposite sides for winding with the pins, so that the wire ends of the high and low voltage coils are as far away as possible, and there is no possibility of mutual interlacing. Then they are encapsulated with potting glue to further ensure insulation.

[0018] Preferably, a support end plate 21 is provided at the end of the high-voltage coil skeleton 2, and the outer annular surface of the support end plate 21 is in contact with the inner wall of the outer shell 3. The support end plate 21 separates the transition cavity 6 and the high-voltage insulation cavity 5. The vertical surfaces on both sides of the support end plate 21 are respectively provided with slots 22, and the transition cavity 6 is connected to the high-voltage insulation cavity 5 through the slots 22. The pin 7 is fixedly arranged on one side of the slot 22, and the line end insulation cavity 8 is arranged around the outside of the pin 7, and the line end insulation cavity 8 is connected to the slot 22. The high and low voltage insulation cavities are both connected to the line end insulation cavity through the slot position, so that each pin can be selectively wound around the wire end of the high-voltage coil or the wire end of the low-voltage coil. The wiring method of the pin can be selected according to the actual wiring needs, and it does not affect the spatial structure for achieving internal perfusion insulation.

[0019] The winding area of the high-voltage coil bobbin 2 is arranged with a number of partitions 23. These partitions 23 divide the high-voltage insulation cavity 5 into multiple annular cavities 51. Notches 24 are provided on the edges of these partitions 23 to connect the annular cavities 51 on either side. The notches 24 on adjacent partitions 23 are symmetrically arranged relative to the central axis of the annular cavities 51.

[0020] When filling the high-voltage insulation cavity, the insulating medium can be filled one by one in the direction of the annular cavity arrangement, and the staggered and symmetrical gaps help ensure that the insulating medium fully fills each annular cavity. In addition, because the gate directly penetrates the outer shell and the high-voltage coil skeleton to connect to the low-voltage insulation cavity, and then gradually fills from the inside out, the gate can be set on the upper surface of one end, and an exhaust port connected to the high-voltage insulation cavity is set on the upper surface of the other end away from the gate. This further realizes the gradual filling of the internal gap of the entire structure from one end to the other end, which is conducive to fully exhausting the internal air, so that the insulating medium completely fills the internal gap, avoiding the presence of bubbles that affect its insulation effect. This further improves the insulation performance.

[0021] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An insulation structure for a high-voltage transformer, characterized in that: The invention comprises a low-voltage coil frame (1), a high-voltage coil frame (2) and an outer shell (3), wherein the high-voltage coil frame (2) is sleeved on the outside of the low-voltage coil frame (1), and the outer shell (3) is wrapped around the outside of the high-voltage coil frame (2); a low-voltage insulation cavity (4) is formed between the low-voltage coil wound on the low-voltage coil frame (1) and the inner hole wall of the high-voltage coil frame (2); a high-voltage insulation cavity ( 5); a transition cavity (6) is formed between the end face of the high-voltage coil skeleton (2) and the inner cavity wall of the outer shell (3); a line end insulation cavity (8) corresponding to a plurality of pins (7) is provided in the outer shell (3); the outer shell (3) and the high-voltage coil skeleton (2) are provided with a gate (9) passing through the two, the gate (9) is connected to the low-voltage insulation cavity (4), and the low-voltage insulation cavity (4) is connected to the high-voltage insulation cavity (5) and the line end insulation cavity (8) through the transition cavity (6).

2. The insulation structure of a high-voltage transformer according to claim 1, characterized in that: The plurality of pins (7) are arranged on the high-voltage coil frame (2) and are respectively located on the vertical surfaces on both sides of the two ends thereof.

3. The insulation structure of a high-voltage transformer according to claim 2, characterized in that: A supporting end plate (21) is provided at the end of the high-voltage coil skeleton (2), the outer annular surface of the supporting end plate (21) is in contact with the inner wall of the outer shell (3), and the supporting end plate (21) separates the transition cavity (6) and the high-voltage insulation cavity (5). Notches (22) are respectively provided on the vertical surfaces on both sides of the supporting end plate (21), and the transition cavity (6) is connected to the high-voltage insulation cavity (5) through the notches (22).

4. The insulation structure of a high-voltage transformer according to claim 3, characterized in that: The pin (7) is fixedly arranged on one side of the notch (22), the wire end insulation cavity (8) is arranged around the outside of the pin (7), and the wire end insulation cavity (8) is communicated with the notch (22).

5. The insulation structure of a high-voltage transformer according to claim 4, characterized in that: A plurality of partitions (23) are arranged in the winding area of the high-voltage coil skeleton (2), and the partitions (23) divide the high-voltage insulation cavity (5) into a plurality of annular cavities (51); a notch (24) is provided on the edge of the partition (23) for connecting the annular cavities (51) on both sides thereof.

6. The insulation structure of a high-voltage transformer according to claim 5, characterized in that: The notches (24) on the adjacent partitions (23) are symmetrically arranged relative to the central axis of the annular cavity (51).

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