Strut for pancake coil of transformer and pancake coil of transformer

Abstract

The utility model discloses a supporting strip for a transformer pancake coil and the coil thereof, and relates to the technical field of transformer production. The supporting strip comprises an extending section, a connecting notch and a mounting section; the mounting sections are adhered to the outer side wall of the paper tube, and a plurality of mounting sections are arranged in the circumferential direction of the outer side wall of the paper tube at intervals; the mounting sections are connected with the extending sections through the connecting notches; the extending section extends out of the paper tube along the mounting section; the thickness of the mounting section is equal to that of the extending section; the thickness of the connecting notch is smaller than that of the mounting section or the extending section. A two-section structure is adopted, the two-section structure is connected through a thin paperboard, reliable supporting can be provided for a winding coil before pressing, redundant parts do not need to be removed through a saw blade after pressing, saw dust and dust are prevented from falling into a cake type coil, and hidden dangers of the saw dust and the dust do not exist.

Description

Technical Field

[0001] The present application relates to the technical field of transformer production, and in particular to a support bar for a transformer pancake coil and a coil thereof. Background Art

[0002] The pancake coils in existing transformers need to be wound around a paper tube with multiple struts arranged around the outer wall. However, when the pancake coils are wound, the coils are stacked one by one to form a spring-like structure, and there needs to be a margin in the axial direction of the paper tube to leave space for the coil to rebound and deform after winding. After winding, the pancake coils need to be baked first, and then compressed to the size required by the drawing. Therefore, the length of the struts is longer than the paper tube to accommodate the coils before compression.

[0003] After the coil is pressed, the excess support bars can only be sawed off with a saw blade. When the excess support bars are sawed off with a saw blade, the sawdust and dust generated by the cutting will fall into the pancake coil, causing the transformer's power frequency withstand voltage and partial discharge problems, and in severe cases, the coil will be punctured and burned.

[0004] At the same time, the sawn cuts of the support strips stuck on the paper tube are uneven, and the burrs are difficult to be completely polished away, which affects the appearance and the performance of the transformer pancake coil.

[0005] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in the field. Utility Model Content

[0006] The present application provides a support bar for a pancake coil of a transformer and a coil thereof. In the prior art, the redundant support bars after the coil is pressed can only be cut off by a saw blade. When the redundant support bars are cut off by a saw blade, sawdust and dust generated by the cutting will fall into the pancake coil, causing problems with the transformer's power frequency withstand voltage and partial discharge, and in severe cases, causing technical problems such as breakdown and burning of the coil.

[0007] The structure provided by the present application can avoid cutting too long struts, avoid the generation of sawdust and dust, and improve the performance and quality of the processed transformer.

[0008] The present application provides a support bar for a pancake coil of a transformer, comprising: an extension section, a connection notch, and a mounting section; the mounting section is glued and arranged on the outer wall of a paper tube, and a plurality of mounting sections are arranged at intervals along the circumferential direction of the outer wall of the paper tube; each mounting section is connected to the extension section through the connection notch; the extension section is extended outside the paper tube along the mounting section;

[0009] The thickness of the installation section is equal to the thickness of the extension section; the thickness of the connection gap is less than the thickness of the installation section or the extension section.

[0010] Preferably, the connecting gap comprises: a paperboard layer; the paperboard layer is connected to the extending section and the installation section respectively; and the thickness of the paperboard layer is 1-3 mm.

[0011] Preferably, the paperboard layer is arranged to extend out of the paper tube.

[0012] Preferably, the installation section comprises: a paperboard layer and a support layer; the support layer is arranged on the outer wall of the paperboard layer; and the paperboard layer is arranged on the outer wall of the paper tube.

[0013] Preferably, the extended section comprises: a paperboard layer and a support layer; the support layer is arranged on the outer wall of the paperboard layer; and the paperboard layer is connected to the connecting notch.

[0014] Preferably, the support layer has a thickness of 6 to 12 mm.

[0015] Preferably, the connecting notch has an axial length of 1 to 2 mm along the paper tube.

[0016] Preferably, the length of the extended section is 100-200 mm longer than the paper tube.

[0017] Preferably, the circumferential width of the paperboard layer along the paper tube is greater than the circumferential width of the support layer along the paper tube.

[0018] Another aspect of the present application provides a transformer pancake coil, comprising: a plurality of transformer pancake coil support bars of the above structure, a plurality of coil groups, and a paper tube; the transformer pancake coil support bars are arranged on the outer wall of the paper tube; and the coil groups are stacked and wound outside the support bars.

[0019] The beneficial effects of this application include:

[0020] 1) The support bar for the pancake coil of the transformer provided in this application adopts a two-section structure, and the two sections are connected by a thinner cardboard. It can provide reliable support for the wound coil before pressing, and after pressing, there is no need to use a saw blade to remove the excess part, so as to prevent sawdust and dust from falling into the pancake coil. There is no hidden danger of sawdust and dust, and the performance of the transformer is improved, the transformer power frequency withstand voltage and partial discharge problems are avoided, and the coil is prevented from being punctured and burned.

[0021] 2) The support bar for the pancake coil of the transformer provided in the present application has a structure that only needs to be broken to remove the excess part. The broken area is smooth and burr-free, and no secondary processing is required. It can also avoid the residual burrs from causing adverse effects on the performance of the transformer.

[0022] 3) The pancake-shaped coil of the transformer provided in the present application has no residual burrs on the top of the support bar after pressing, and the cross section is neat and uniform, thereby improving the quality of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic top view of a support bar in at least one embodiment provided in the present application;

[0024] Figure 2 A schematic front view of a support bar in at least one embodiment provided in the present application;

[0025] Figure 3 A schematic side view of a support bar in at least one embodiment provided in the present application;

[0026] Figure 4 A schematic front view of a pancake coil of a transformer in at least one embodiment provided in the present application;

[0027] Figure 5 A schematic top view of a pancake coil of a transformer in at least one embodiment provided in the present application;

[0028] Figure 6 A schematic side view of a pancake coil of a transformer in at least one embodiment provided in the present application;

[0029] Legend:

[0030] The extending section 21 , the mounting section 22 , the paper tube 1 , the connecting notch 23 , the paperboard layer 211 , the supporting layer 212 , and the coil assembly 3 . DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0033] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in the field, and can be implemented in a variety of common knowledge settings.

[0034] See also Figures 1 to 3The transformer pancake coil support provided in the present application comprises: an extension section 21, a connection notch 23, and a mounting section 22; the mounting section 22 is glued and arranged on the outer wall of the paper tube 1, and a plurality of mounting sections 22 are arranged at intervals along the circumferential direction of the outer wall of the paper tube 1; the top of the mounting section 22 is connected to the extension section 21 through the connection notch 23. The extension section 21 is extended outside the paper tube 1 along the mounting section 22.

[0035] The thickness of the mounting section 22 is equal to the thickness of the extension section 21, and the thickness of the connecting notch 23 is less than the thickness of the mounting section 22 or the extension section 21. The inner side surfaces of the extension section 21, the connecting notch 23, and the mounting section 22 are flush.

[0036] According to this structural arrangement, after the coil is pressed to the design required height, the redundant extended section 21 can be broken off through the thin connection notch 23, thereby preventing sawdust and dust generated by the saw blade from falling into the pancake coil, thereby improving the performance of the transformer and enhancing the quality.

[0037] In a specific embodiment, the connection gap 23 includes: a paperboard layer 211; two ends of the paperboard layer 211 are respectively connected to the extension section 21 and the installation section 22. The paperboard layer 211 is extended out of the paper tube 1.

[0038] In a specific embodiment, the thickness of the paperboard layer 211 is 1-3 mm.

[0039] In a specific embodiment, the installation section 22 includes: a paperboard layer 211 and a support layer 212 ; the support layer 212 is adhered to the outer wall of the paperboard layer 211 ; and the paperboard layer 211 is adhered to the outer wall of the paper tube 1 .

[0040] In a specific embodiment, the extending section 21 includes: a paperboard layer 211 and a support layer 212 ; the support layer 212 is adhered to the outer wall of the paperboard layer 211 , the paperboard layer 211 is connected to the connecting notch 23 , and the paperboard layer 211 extends out of the paper tube 1 .

[0041] In one specific embodiment, the thickness of the support layer 212 is 6-12 mm.

[0042] According to this structural arrangement, the uniformity of the cutout of the mounting structure can be improved, and the breaking operation is convenient. At the same time, the extended section 21 can provide reliable support for the coil structure before pressing, avoiding the occurrence of premature breaking.

[0043] In a specific embodiment, the length of the connecting notch 23 along the axial direction of the paper tube 1 is 1-2 mm. This height can ensure the smooth breaking operation and the reliability of the force of the extended section 21 before the coil is pressed.

[0044] In a specific embodiment, the length of the extension section 21 is 100-200 mm longer than that of the paper tube 1 .

[0045] In a specific embodiment, the circumferential width of the paperboard layer 211 along the paper tube 1 is greater than the circumferential width of the support layer 212 along the paper tube 1, and the central axes of the paperboard layer 211 and the support layer 212 are overlapped. According to this arrangement, the amount of the support layer 212 can be reduced, saving costs while obtaining reliable supporting force.

[0046] See also Figures 4 to 6 Another aspect of the present application also provides a transformer pancake coil, including: a plurality of struts as structured above, a plurality of coil groups 3, and a paper tube 1; the struts are glued to the outer wall of the paper tube 1 and are evenly spaced along the circumference of the paper tube 1; and a plurality of coil groups are wound around the outside of the struts.

[0047] Multiple paper pads are set between 3 adjacent coil groups ( Figures 4 to 6 For ease of explanation Figures 4 to 6 Only one strut structure is shown.

[0048] One end of the paper pad is connected to the outer wall of the support bar, and the other end is perpendicular to the outer wall of the paper tube 1 and extends outward. Adjacent coils are isolated by multiple paper pads arranged on the cross section of the same paper tube 1. According to this arrangement, insulation isolation between adjacent coils can be achieved.

[0049] The operation process is as follows:

[0050] The coil is wound on the outer wall of the paper tube 1 on which the structural support is installed, and a plurality of paper pads are arranged between adjacent coil groups 3. After the pancake coil is wound and baked, and then compressed to the size required by the drawing, the connecting notch 23 is broken by hand and the protruding section 21 is removed. Sawdust and dust are prevented from falling into the pancake coil. At the same time, the place where the connecting notch is broken is smooth and neat, and there is basically no burr.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stay for a transformer pancake coil, characterized in that: include: An extension section (21), a connecting notch (23), and a mounting section (22); the mounting section (22) is glued to the outer wall of the paper tube (1), and a plurality of mounting sections (22) are arranged at intervals along the circumference of the outer wall of the paper tube (1); each mounting section (22) is connected to the extension section (21) via the connecting notch (23); the extension section (21) is extended outside the paper tube (1) along the mounting section (22); The thickness of the mounting section (22) is equal to the thickness of the extending section (21); the thickness of the connecting notch (23) is smaller than the thickness of the mounting section (22) or the extending section (21); The connecting gap (23) comprises: a paperboard layer (211); the paperboard layer (211) is respectively connected to the extending section (21) and the mounting section (22).

2. The transformer pancake coil stay according to claim 1, characterized in that: The thickness of the paperboard layer (211) is 1-3 mm.

3. The transformer pancake coil stay according to claim 2, characterized in that: The paperboard layer (211) is arranged to extend out of the paper tube (1).

4. The transformer pancake coil stay according to claim 1, characterized in that: The installation section (22) comprises: a paperboard layer (211) and a support layer (212); the support layer (212) is arranged on the outer wall of the paperboard layer (211); and the paperboard layer (211) is arranged on the outer wall of the paper tube (1).

5. The transformer pancake coil stay according to claim 1, characterized in that: The extended section (21) comprises: a paperboard layer (211) and a support layer (212); the support layer (212) is arranged on the outer wall of the paperboard layer (211); and the paperboard layer (211) is connected to the connection notch (23).

6. The transformer pancake coil stay according to claim 4 or 5, characterized in that: The thickness of the support layer (212) is 6-12 mm.

7. The transformer pancake coil stay according to claim 1, characterized in that: The length of the connecting notch (23) along the axial direction of the paper tube (1) is 1 to 2 mm.

8. The transformer pancake coil stay according to claim 1, characterized in that: The length of the extended section (21) is 100-200 mm longer than that of the paper tube (1).

9. The transformer pancake coil stay according to claim 1, characterized in that: The circumferential width of the paperboard layer (211) along the paper tube (1) is greater than the circumferential width of the support layer (212) along the paper tube (1).

10. A transformer pancake coil, characterized in that: include: A plurality of transformer pancake coil support bars as claimed in any one of claims 1 to 9, a plurality of coil groups (3), and a paper tube (1); the transformer pancake coil support bars are arranged on the outer wall of the paper tube (1); and the coil groups (3) are stacked and wound outside the support bars.

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