Oil duct for oil-immersed transformer
By opening trapezoidal grooves on the struts of the oil-immersed transformer and embedding paper tapes, the adjustability of the strut spacing is achieved, and the problems of insufficient strut strength and fixed spacing in the prior art are solved, and the mechanical strength of the winding is improved and Heat dissipation effect.
Patent Information
- Application Number
- CN202421221539.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The oil channel struts of existing oil-immersed transformers are insufficient in strength and the spacing between struts is fixed, resulting in reduced winding strength and poor heat dissipation effect.
Open a trapezoidal groove on the strut, embed the paper tape into the groove, form an oil channel strut curtain, and use the gap coordination to achieve adjustability of the strut spacing.
The adjustable strut spacing ensures that the inner and outer oil passage struts of the winding are strictly aligned, improving mechanical strength and short-circuit resistance, while improving heat dissipation effect.
Smart Images
Figure CN222440309U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil-immersed transformers, in particular to an oil channel for an oil-immersed transformer. Background Art
[0002] At present, oil-immersed transformers have the advantages of low cost, easy maintenance, and strong environmental adaptability. They are widely used in power systems, especially new energy power systems based on photovoltaic and wind power. At present, the competition in the new energy market has entered a fierce stage, and aluminum winding products have received the focus of the industry, especially in foreign markets where aluminum winding transformers have been used in batches. The material strength of aluminum winding products is relatively low, so there are higher requirements for oil channel stays: the inner and outer stays must be strictly aligned; the oil channel stays have sufficient support for the windings.
[0003] In the prior art, the oil channel generally uses corrugated cardboard or adhesively formed stay curtains. However, the corrugated cardboard has low strength and is easily crushed when subjected to force, blocking the oil channel. The stay curtains formed by adhesive molding have fixed stay spacing, and the stay spacing cannot be fine-tuned according to actual conditions during use, resulting in insufficient uniformity of the one-to-one correspondence between the inner and outer stays, thereby reducing the strength of the winding. Summary of the invention
[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the utility model is to provide an oil channel for an oil-immersed transformer, by opening a trapezoidal groove on the support bar and embedding it on a paper tape to form an oil channel support bar curtain, and the two are matched with a gap, so that the support bar spacing can be adjusted according to actual conditions, ensuring that the oil channel support bars inside and outside the winding are strictly aligned, and having the advantages of adjustable spacing, high strength and good heat dissipation effect.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] An oil channel for an oil-immersed transformer comprises a stay 2 and a paper tape 1. The stay 2 is provided with a plurality of trapezoidal grooves 2-1 at intervals. The paper tape 1 passes through the trapezoidal grooves 2-1 and intersects with the stay 2 to form an oil channel stay curtain 6.
[0007] The support bar 2 is made of pressed insulating paperboard or laminated wood, and the cross section of the support bar 2 is a rounded rectangular shape.
[0008] The strut 2 has a width of 5-12 mm and a thickness of 4-8 mm.
[0009] The opening width of the trapezoidal groove 2-1 is smaller than the groove bottom width.
[0010] The paper tape 1 is made of insulating paperboard, and the cross section of the paper tape 1 is trapezoidal.
[0011] The paper tape 1 is clearance-matched with the trapezoidal groove 2-1.
[0012] The paper tape 1 has a width of 10-15 mm and a thickness of 1.5-2 mm.
[0013] There are at least two of the plurality of trapezoidal grooves 2 - 1 symmetrically arranged inwardly from both ends of the stay 2 .
[0014] Compared with the prior art, the utility model has the following technical effects:
[0015] 1. In the utility model, the support bars are connected by paper tape, and the back adhesive cardboard is eliminated, which reduces the shielding of the winding and improves the heat dissipation effect.
[0016] 2. The middle support bar of the utility model is connected by two paper tapes, which can ensure that the oil channel support bars are placed in parallel, the oil flow is smooth, and the heat dissipation effect is ensured.
[0017] 3. The spacing between the oil channel stays in the utility model is adjustable, which can achieve strict alignment of the inner and outer stays of the winding, ensure the mechanical strength of the winding, and enhance the ability to resist short circuits.
[0018] In summary, the utility model forms an oil channel support curtain by cutting trapezoidal grooves on the support bars and then embedding them on the paper tape. The two are matched with each other with a gap, so that the support bar spacing can be adjusted according to actual conditions, ensuring that the oil channel support bars inside and outside the winding are strictly aligned. It has the advantages of adjustable spacing, high strength and good heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model; wherein, Figure 1 (a) is the main view of the structure. Figure 1 (b) is a side view of the structure.
[0020] Figure 2 It is a schematic diagram of the structure of the paper tape 1 of the utility model; wherein, Figure 2 (a) is the front view of the paper tape 1, Figure 2 (b) is a side view of the paper tape 1.
[0021] Figure 3 It is a schematic diagram of the structure of a single support bar 2 of the utility model; wherein, Figure 3 (a) is a side view of a single strut 2, Figure 3 (b) is a partial enlarged view of the trapezoidal groove 2-1.
[0022] Figure 4 It is a structural schematic diagram of the utility model applied to a winding.
[0023] Among them: 1-paper tape; 2-support bar; 2-1 trapezoidal slot; 3-iron core; 4-low voltage winding; 5-high voltage winding; 6-oil channel. DETAILED DESCRIPTION
[0024] The utility model is described in further detail below in conjunction with the accompanying drawings.
[0025] See also Figures 1 to 4 An oil channel for an oil-immersed transformer includes a stay 2 and a paper tape 1. The stay 2 is provided with a plurality of trapezoidal grooves 2-1 at intervals. The paper tape 1 passes through the trapezoidal grooves 2-1 and crosses the stay 2 to form an oil channel stay curtain 6.
[0026] The support bar 2 is made of pressed insulating paperboard or laminated wood, and the cross section of the support bar 2 is a rounded rectangular shape.
[0027] The strut 2 has a width of 5-12 mm and a thickness of 4-8 mm.
[0028] The paper tape 1 is made of insulating paperboard, and the cross section of the paper tape 1 is trapezoidal.
[0029] The paper tape 1 is clearance-matched with the trapezoidal groove 2-1 so that the spacing between the stays 2 can be adjusted.
[0030] The paper tape 1 has a width of 10-15 mm and a thickness of 1.5-2 mm.
[0031] The opening width of the trapezoidal groove 2-1 is smaller than the groove bottom width.
[0032] There are at least two of the plurality of trapezoidal grooves 2 - 1 symmetrically arranged inwardly from both ends of the stay 2 .
[0033] The working principle of the utility model is:
[0034] See also Figure 4 , multiple trapezoidal grooves 2-1 are opened on the stays 2, multiple paper tapes 1 are embedded in the trapezoidal grooves 2-1 of the multiple stays 2 to form an oil channel stay curtain 6, and the spacing between the oil channel stay curtain 6 and the stays 2 is adjustable; after the low voltage winding 4 is wound for a specified number of turns according to the design, the first layer of the oil channel stay curtain 6 is placed, the spacing between the stays 2 is adjusted according to the design plan, the winding continues to be wound for a specified number of turns, and then the second layer of the oil channel stay curtain 6 is placed, and the spacing between the stays 2 is adjusted to align with the stays 2 of the first layer of the oil channel stay curtain 6 one by one. The coil winding is completed by analogy.
[0035] The specific embodiments of the present invention are given above. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.
Claims
1. An oil channel for an oil-immersed transformer, comprising a stay (2) and a paper tape (1), characterized in that: A plurality of trapezoidal grooves (2-1) are arranged at intervals on the support bar (2), and the paper tape (1) passes through the trapezoidal grooves (2-1) and intersects with the support bar (2) to form an oil channel support bar curtain (6).
2. The oil channel for an oil-immersed transformer according to claim 1, characterized in that: The support bar (2) is made of pressed insulating paperboard or laminated wood, and the cross section of the support bar (2) is a rounded rectangular shape.
3. The oil channel for an oil-immersed transformer according to claim 1 or 2, characterized in that: The strut (2) has a width of 5-12 mm and a thickness of 4-8 mm.
4. The oil channel for an oil-immersed transformer according to claim 1, characterized in that: The opening width of the trapezoidal groove (2-1) is smaller than the groove bottom width.
5. The oil channel for an oil-immersed transformer according to claim 1, characterized in that: The paper tape (1) is made of insulating paperboard, and the cross section of the paper tape (1) is trapezoidal.
6. The oil channel for an oil-immersed transformer according to claim 1, characterized in that: The paper tape (1) and the trapezoidal groove (2-1) are clearance-matched.
7. An oil channel for an oil-immersed transformer according to any one of claims 1, 5 and 6, characterized in that: The paper tape (1) has a width of 10-15 mm and a thickness of 1.5-2 mm.
8. The oil channel for an oil-immersed transformer according to claim 1, characterized in that: At least two of the plurality of trapezoidal grooves (2-1) are symmetrically arranged inwardly from both ends of the support bar (2).