Inner support frame of iron core single frame and iron core single frame

Abstract

The application provides an inner support frame of a core single frame and the core single frame. The inner support frame is a round rectangular frame enclosed by two longitudinal frame edges, two transverse frame edges and four arc-shaped frame edges. The arc-shaped frame edges are sequentially provided with a first side portion, a middle portion and a second side portion in the axial direction. The outer wall surface of the middle portion is located outside the outer wall surfaces of the first side portion and the second side portion. The outer wall surface of the middle portion is located outside the outer wall surfaces of the first side portion and the second side portion. In this way, the inner support frame has a supporting capacity, the structural strength of the single frame base body is enhanced, the deformation probability of the single frame base body is reduced, the excitation loss of the core is significantly reduced, and the operation noise of the transformer is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a single-frame iron core and its internal support frame. Background Technology

[0002] The iron core is the main magnetic circuit component of a transformer, and it is usually assembled from multiple iron core frames. The joints between the iron core frames are used for winding coils, and the iron core and the coils wound on it form an electromagnetic induction system.

[0003] The iron core frame consists of a frame substrate and an inner support frame supported within the frame substrate. The frame substrate is formed by winding conductive magnetic tape layer by layer.

[0004] The high excitation loss of the existing iron core leads to high operating noise in the transformer. Therefore, reducing the excitation loss of the iron core is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an inner support frame for a single-frame iron core. The inner support frame is a rounded rectangular frame formed by two longitudinal frame sides, two transverse frame sides, and four arc-shaped frame sides. The arc-shaped frame sides are provided with a first side, a middle part, and a second side in sequence along the axial direction. The outer wall surface of the middle part is located outside the outer wall surfaces of the first side and the second side.

[0006] Optionally, the distance T between the outer wall surface of the first side portion and the outer wall surface of the second side portion and the outer wall surface of the middle portion in the inward and outward directions is ≤50mm.

[0007] Optionally, the thickness of the first side portion and the thickness of the second side portion are both no greater than the thickness of the middle portion.

[0008] Optionally, the arc-shaped frame edge is of equal thickness, and the longitudinal frame edge and the transverse frame edge are also of equal thickness.

[0009] Optionally, the arc-shaped frame edge has a structure that is thicker in the middle and thinner on both sides, and the longitudinal frame edge and the transverse frame edge also have a structure that is thicker in the middle and thinner on both sides.

[0010] Optionally, the first side portion and the second side portion are both of equal thickness; or, the first side portion and the second side portion are both of gradually tapering thickness, specifically tapering along the direction of the center line, and becoming thinner the further away from the middle portion.

[0011] Optionally, the outer edge of the cross-section of the middle part, the outer edge of the cross-section of the longitudinal frame edge, and the outer edge of the cross-section of the transverse frame edge are all straight lines.

[0012] Optionally, the longitudinal frame edge is a straight frame edge without curvature in the longitudinal direction, and the transverse frame edge is an arc-shaped frame edge with a certain curvature in the transverse direction or a straight frame edge without curvature in the transverse direction.

[0013] Optionally, the inner support frame may be made of iron, iron alloy, copper, copper alloy, titanium, titanium alloy, ceramic, silicone resin, or fiberglass.

[0014] In addition, the present invention also provides a core single frame, the core single frame including an inner support frame and a single frame base formed by layer winding of strip material, the inner support frame being supported inside the single frame base, characterized in that the inner support frame is any of the inner support frames described above, the middle part of the arc-shaped frame edge of the inner support frame is in contact with the single frame base, and a gap is formed between the first side and the second side of the arc-shaped frame edge of the inner support frame and the single frame base.

[0015] This invention places the outer wall of the middle section of the inner support frame outside the outer walls of the first and second sides. In application, the middle section contacts the single-frame substrate, while gaps exist between the first and second sides and the single-frame substrate. This structure, while ensuring the supporting strength of the inner support frame, provides stress relief space at the curved edge of the single-frame substrate, where stress is greatest. Therefore, releasing this stress significantly reduces the excitation loss of the core, thereby significantly reducing core noise. Furthermore, this structure only causes microscopic deformation on the inner side of the single-frame substrate without affecting the overall dimensions of the core. Attached Figure Description

[0016] Figure 1 A schematic diagram of one embodiment of the inner support frame of the iron core single frame provided by the present invention;

[0017] Figure 2 Showing Figure 1 The cross-section of the two curved frame edges on the upper middle side.

[0018] Figure 3 To adopt Figure 1 A schematic diagram of the cross-section of the iron core frame of the inner support frame at the edge of the arc frame;

[0019] Figure 4 Cross-sectional schematic diagrams of several embodiments of the curved frame edge;

[0020] Figure 5 Cross-sectional schematic diagrams of several embodiments of vertical or horizontal frame edges;

[0021] Figure 6 These are projection views of two embodiments of the internal support frame in a plane perpendicular to the center line.

[0022] The annotations in the attached figures are explained as follows:

[0023] 10. Internal support frame;

[0024] 101 Arc-shaped frame edge, 1011 First side, 1012 Middle part, 1013 Second side;

[0025] 102 Vertical frame border, 103 Horizontal frame border;

[0026] 20 Single-frame substrate. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The iron core is the main magnetic circuit part of a transformer. The iron core and the coils wound around it form an electromagnetic induction system. The iron core is usually assembled from multiple iron core frames.

[0029] The iron core single frame includes a single frame base 20 and an inner support frame 10. The single frame base 20 is formed by winding conductive magnetic material layer by layer, and the inner support frame 10 is supported inside the single frame base 20.

[0030] like Figure 1 As shown, the inner support frame 10 of the iron core single frame provided by the present invention is a rounded rectangular frame formed by two longitudinal frame sides 102, two transverse frame sides 103, and four arc-shaped frame sides. The arc-shaped frame sides are provided with a first side part 1011, a middle part 1012, and a second side part 1013 in sequence along the axial direction a.

[0031] Combination Figure 2 As shown, both the first side portion 1011 and the second side portion 1013 are bent inward relative to the middle portion 1012, so that the outer wall surface of the middle portion 1012 is outside the outer wall surfaces of the first side portion 1011 and the second side portion 1013. In application, combined with Figure 3 As shown, the middle portion 1012 of the arc-shaped frame edge 101 contacts the single-frame base 20, while there are gaps between the first side portion 1011 and the second side portion 1013 of the arc-shaped frame edge 101 and the single-frame base 20. This structure, while ensuring the supporting strength of the inner support frame, allows the single-frame base to have a certain stress relief space at the arc-shaped frame edge. Since the stress in the single-frame base is greatest at the arc-shaped frame edge, releasing this stress can significantly reduce the excitation loss of the core, thereby significantly reducing core noise. Moreover, this structure only causes microscopic deformation on the inner side of the single-frame base without affecting the external dimensions of the core.

[0032] Specifically, the distance between the outer wall of the first side portion 1011 and the outer wall of the middle portion 1012 in the inward and outward directions (i.e., T1 in the figure), and the distance between the outer wall of the second side portion 1013 and the outer wall of the middle portion 1012 in the inward and outward directions (i.e., T2 in the figure), are both no greater than 50 mm. Setting T1 and T2 within this range makes the inner support frame 10 easier to form and results in higher structural strength. It should be noted that it is best to make the first side portion 1011 and the second side portion 1013 symmetrical about the center line of the middle portion 1012. In this case, the sizes of T1 and T2 are equal, thus making the stress on the inner support frame 10 more uniform.

[0033] Specifically, such as Figure 4 As shown, the thickness of the first side portion 1011 and the thickness of the second side portion 1013 are both no greater than the thickness of the middle portion 1012. With this configuration, the strength at the junction of the middle portion 1012 with the first side portion 1011 and the second side portion 1013 is high, making it less prone to breakage at the junction and thus providing better support.

[0034] Specifically, the curved frame edge 101 can be a structure of uniform thickness (e.g., Figure 4 As shown in -a), in this case, the thickness of any position on the first side 1011, the second side 1013, and the middle part 1012 is equal. Simultaneously, the longitudinal frame edge 102 and the transverse frame edge 103 are also of equal thickness (as shown in -a). Figure 5 -e (as shown in the image).

[0035] Alternatively, the curved frame 101 can also be a structure that is thick in the middle and thin on both sides (e.g. Figure 4 As shown in -b, 4-c, 4-d, and 4-e), the cross-section of the longitudinal frame 102 and the transverse frame 103 are also structures that are thick in the middle and thin on both sides (as shown in -b, 4-c, 4-d, and 4-e). Figure 5 (as shown in -a, 5-b, 5-c, and 5-d).

[0036] When the curved frame edge 101 adopts a structure that is thick in the middle and thin on both sides, the first side 1011 and the second side 1013 can be of equal thickness (e.g., Figure 4 -b) or, alternatively, it can be a structure with a gradually decreasing thickness along the axial direction a, becoming thinner the further away from the middle part 1012 (as shown in -b). Figure 4 (as shown in -c, 4-d, 4-e).

[0037] The tapering form of a thickness-tapered structure can specifically be a diagonal tapering (e.g.) Figure 4 -c shows) an arc-shaped taper (as shown in the image) Figure 4 -d as shown), stepped taper (as shown in the figure) Figure 4 -e (as shown), etc.

[0038] Specifically, in application, besides the middle part 1012 of the curved frame edge 101 contacting the single frame base 20, the outer wall surfaces of the longitudinal frame edge 102 and the transverse frame edge 103 also contact the single frame base 20. For example... Figure 4 and Figure 5 As shown, it is preferable to set the outer edge of the cross-section of the middle part 1012, the outer edge of the cross-section of the longitudinal frame edge 102, and the outer edge of the cross-section of the transverse frame edge 103 as straight lines. This allows the middle part 1012, the longitudinal frame edge 102, and the transverse frame edge 103 to be in closer contact with the single frame base 20, thereby enhancing the strength of the iron core single frame.

[0039] Specifically, such as Figure 6 As shown in -a, the longitudinal frame edge 102 is a straight frame edge without bending in the longitudinal direction. In the application state, the longitudinal frame edges 102 of the two iron core single frames are spliced ​​together to form a winding column, and the coil is wound around the outer circumference of the winding column. It should be noted that the straight frame edge is affected by the machining accuracy, and the straightness will have a slight deviation. It cannot be absolutely straight.

[0040] Specifically, such as Figure 6 As shown in -a, the horizontal frame edge 103 can be a straight frame edge without any curvature in the horizontal direction. Or, as... Figure 6 As shown in -b, the horizontal frame edge 103 can also be an arc-shaped frame edge with a certain curvature in the horizontal direction. This setting can reduce the core stress.

[0041] Specifically, the material of the inner support frame 10 can be iron, iron alloy, copper, copper alloy, titanium, titanium alloy, ceramic, silicone resin, fiberglass, etc.

[0042] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An inner support frame for a single-frame iron core, characterized in that, The inner support frame (10) is a rounded rectangular frame formed by two longitudinal frame sides (102), two transverse frame sides (103) and four arc-shaped frame sides (101). The arc-shaped frame sides (101) are provided with a first side part (1011), a middle part (1012) and a second side part (1013) in sequence along the axial direction of the circumference where the arc-shaped frame sides (101) are located. The outer wall surface of the middle part (1012) is outside the outer wall surface of the first side part (1011) and the outer wall surface of the second side part (1013).

2. The inner support frame of the iron core single frame according to claim 1, characterized in that, The distance T between the outer wall surface of the first side portion (1011) and the outer wall surface of the second side portion (1013) and the outer wall surface of the middle portion (1012) in the inner and outer directions is ≤50mm.

3. The inner support frame of the iron core single frame according to claim 1, characterized in that, The thickness of the first side portion (1011) and the thickness of the second side portion (1013) are both no greater than the thickness of the middle portion (1012).

4. The inner support frame of the iron core single frame according to claim 3, characterized in that, The arc-shaped frame edge (101) is of equal thickness, and the longitudinal frame edge (102) and the transverse frame edge (103) are also of equal thickness.

5. The inner support frame of the iron core single frame according to claim 3, characterized in that, The arc-shaped frame edge (101) has a structure that is thick in the middle and thin on both sides, and the longitudinal frame edge (102) and the transverse frame edge (103) also have a structure that is thick in the middle and thin on both sides.

6. The inner support frame of the iron core single frame according to claim 5, characterized in that, The first side portion (1011) and the second side portion (1013) are both of equal thickness; or, the first side portion (1011) and the second side portion (1013) are both of gradually tapering thickness, specifically tapering along the axial direction, and becoming thinner the further away from the middle portion (1012).

7. The inner support frame of the iron core single frame according to claim 1, characterized in that, The outer edge of the cross-section of the middle part (1012), the outer edge of the cross-section of the longitudinal frame edge (102), and the outer edge of the cross-section of the transverse frame edge (103) are all straight lines.

8. The inner support frame of the iron core single frame according to claim 1, characterized in that, The longitudinal frame edge (102) is a straight frame edge without curvature in the longitudinal direction, and the transverse frame edge (103) is an arc-shaped frame edge with a certain curvature in the transverse direction or a straight frame edge without curvature in the transverse direction.

9. The inner support frame of the iron core single frame according to any one of claims 1-8, characterized in that, The inner support frame (10) is made of iron, iron alloy, copper, copper alloy, titanium, titanium alloy, ceramic, silicone resin or fiberglass.

10. A core frame comprising an inner support frame and a frame base (20) formed by layer-by-layer winding of strip material, wherein the inner support frame is supported inside the frame base (20), characterized in that, The inner support frame is the inner support frame (10) as described in any one of claims 1-9. The middle part (1012) of the arc-shaped frame edge (101) of the inner support frame contacts the single frame base (20). A gap is formed between the first side part (1011) and the second side part (1013) of the arc-shaped frame edge (101) of the inner support frame and the single frame base (20).

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