Transformer and assembling method thereof

Patent metadata

Field	Value
Publication number	US-11610729-B2
Application number	US-202016836833-A
Country	US
Kind code	B2
Filing date	Mar 31, 2020
Priority date	Apr 1, 2019
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

A transformer comprises at least two windings and each of the at least two windings includes at least one lead-out wire, and a silicone rubber heat-shrinkable sleeve is wrapped around the outer surface of the lead-out wire. The at least two windings and a portion of the silicone rubber heat-shrinkable sleeve are encapsulated in a potting box with a first potting sealant, and another portion of the silicone rubber heat-shrinkable sleeve is exposed outside of the potting box.

First claim

What is claimed is:

1. A transformer, comprising:
at least two windings, wherein each of the at least two windings comprises at least one lead-out wire, and a silicone rubber heat-shrinkable sleeve is wrapped around the outer surface of the lead-out wire;
wherein the at least two windings and a portion of the silicone rubber heat-shrinkable sleeve are encapsulated in a potting box with a first potting sealant, and another portion of the silicone rubber heat-shrinkable sleeve is exposed outside of the potting box;
wherein, the potting box includes an inner wall, an outer wall and a bottom plate, at least one of the inner wall and the outer wall of the potting box includes at least one support shoulder and/or the bottom plate of the potting box includes shoulders, at least one of the windings is suspended inside the potting box by the at least one support shoulder or the shoulders.

2. The transformer of claim 1 further comprising a second potting sealant being encapsulated in a space between the first potting sealant and an end surface corresponding to an opening of the potting box.

3. The transformer of claim 1 , wherein Shore hardness of the first potting sealant is in a range of A30 to A40.

4. The transformer of claim 2 , wherein Shore hardness of the second potting sealant is in a range of D70 to D90.

5. The transformer of claim 1 ,
wherein the bottom plate is connected to a bottom portion of the inner wall and a bottom portion of the outer wall;
wherein both an inner side of the outer wall and an outer side of the inner wall include the at least one support shoulder;
wherein both an outer perimeter of one of the at least two windings and an inner perimeter of another of the at least two windings include support bars; and
wherein the support bar is crimped to the corresponding support shoulder to form an insulation clearance between the at least two windings and the bottom plate.

6. The transformer of claim 1 ,
wherein the bottom plate including the shoulders is connected to a bottom portion of the inner wall and a bottom portion of the outer wall;
wherein the shoulders are protruded toward an opening of the potting box, and each of the at least two windings is crimped to the corresponding shoulder.

7. The transformer of claim 1 ,
wherein the bottom plate is connected to a bottom portion of the inner wall and a bottom portion of the outer wall;
wherein an inner side of the outer wall or an outer side of the inner wall includes the at least one support shoulder, and the bottom plate includes the shoulders, wherein the shoulders of the bottom plate are protruded toward an opening of the potting box;
wherein an outer perimeter or an inner perimeter of at least one winding includes a support bar, and the support bar is crimped to the corresponding support shoulder and is suspended inside the potting box, and at least another winding is crimped to the shoulders of the bottom plate.

8. The transformer of claim 1 ,
wherein the bottom plate is connected to a bottom portion of the inner wall and a bottom portion of the outer wall;
wherein both an inner side of the outer wall and an outer side of the inner wall include the at least one support shoulder;
wherein an outer perimeter of one of the at least two windings and an inner perimeter of another of the at least two windings are respectively contacted with the corresponding support shoulders to form an insulation clearance between the at least two windings and the bottom plate.

9. The transformer of claim 8 , wherein the transformer includes an iron core, and a magnetic post of the iron core passes through the inner side of the inner wall of the potting box.

10. The transformer of claim 9 , wherein the at least two windings include a low-voltage winding and a high-voltage winding; and
wherein the low-voltage winding is disposed on the outer side of the inner wall of the potting box and the high-voltage winding is disposed on the inner side of the outer wall of the potting box.

11. The transformer of claim 10 , wherein a lead-out wire of the low-voltage winding is close to the iron core and a lead-out wire of the high-voltage winding is away from the iron core.

12. The transformer of claim 2 , wherein a thickness of the second potting sealant is greater than 2 mm.

13. The transformer of claim 1 , wherein a distance between the upper surface of the first potting sealant and a lower end of the silicone rubber heat-shrinkable sleeve is greater than 5 mm.

14. A transformer, comprising:
at least two windings, wherein each of the at least two windings includes at least one lead-out wire;
wherein a portion of the lead-out wires is encapsulated in a potting box with a first potting sealant, and another portion of the lead-out wires is exposed outside of the first potting sealant;
wherein a first portion of the first potting sealant is shaped by the potting box and a second portion of the first potting sealant is shaped as an insulator and located outside of the potting box;
wherein, the potting box includes an inner wall, an outer wall and a bottom plate, at least one of the inner wall and the outer wall of the potting box includes at least one support shoulder and/or the bottom plate of the potting box includes shoulders, at least one of the windings is suspended inside the potting box by the at least one support shoulder or the shoulders.

Assignees

• Delta Electronics Shanghai Co

Inventors

• Zeng Yong
• Dong Jianxing
• Wang Qiang
• Wang Weijun
• Liu Teng

Classifications

• H01F27/2828

  Construction of conductive connections, of leads · CPC title

• H01F27/022 Primary

  Encapsulation · CPC title

• H01F27/327 Primary

  Encapsulating or impregnating (encapsulating coil and core H01F27/022) · CPC title

• H01F41/005 Primary

  Impregnating or encapsulating (insulating of windings H01F41/12) · CPC title

• H01F27/26

  Fastening parts of the core together; Fastening or mounting the core on casing or support (on coil H01F27/30) · CPC title