Silicon steel sheet mixed winding iron core

Abstract

The utility model relates to the technical field of transformer iron cores, in particular to a silicon steel sheet mixed winding iron core which comprises an inner iron ring and an outer iron ring which are formed by winding silicon steel sheets with different thicknesses, the inner iron ring and the outer iron ring are coaxially arranged, and the outer wall of the inner iron ring is attached to the inner wall of the outer iron ring. And the wall thickness of the inner iron ring is smaller than that of the outer iron ring. Compared with the prior art, the inner iron ring and the outer iron ring which are formed by winding the inner and outer silicon steel sheets with different thicknesses are low in manufacturing cost and convenient to process; the thickness of the inner iron ring is small, so that the magnetic resistance is small, the flux density is high, the loss is low, and the temperature rise and the loss of the inner iron ring and the outer iron ring tend to be balanced and uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer iron cores, in particular to a silicon steel sheet mixed winding iron core. Background Art

[0002] In the application of electronic transformers, toroidal transformers are mainly used as power transformers and isolation transformers. With its good output characteristics and anti-interference ability, toroidal transformers are used in household appliances and other electronic equipment with high technical requirements. However, the length of each turn of the inner and outer windings of ordinary transformers can differ by up to 3 times, so more wires are used, which is not only costly and expensive, but also has a large internal resistance.

[0003] For example, a toroidal power transformer manufacturing process and a toroidal power transformer disclosed in Chinese patent document with publication number CN108711502A have changed the traditional winding method of toroidal transformers, which is to fully wind the toroidal transformer layer by layer. Sufficient gaps are left at the starting point and the end point of each layer of the winding to form a fan-shaped interval on the iron core, thereby ensuring a sufficient safety distance between the starting point and the end point of the maximum voltage difference on each layer; at the same time, interlayer insulation is arranged on the outside of each layer to further avoid interlayer short circuit; at the same time, combined with the manufacturing process of the toroidal iron core and the addition of an overcurrent protection sheet, the toroidal power transformer has been improved in terms of production cost, safety and service life, especially fundamentally solving the problem of short circuit between winding layers and between turns.

[0004] However, the existing transformer core is generally made of cast annular blocks, which have high manufacturing costs, large volume and heavy weight. Furthermore, the inventors have found that the temperature inside and outside the core is uneven and unbalanced when in use. Generally, the temperature inside is higher than that outside, resulting in large magnetic resistance, increased copper loss and uneven loss. Summary of the invention

[0005] In view of the above technical problems existing in the prior art, the utility model provides a silicon steel sheet mixed winding iron core, which overcomes the defects of large inner ring magnetic resistance and low magnetic density of the existing iron core, thereby achieving the effect of balanced temperature and uniform loss inside and outside the iron core.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] Provided is a silicon steel sheet mixed winding iron core, comprising an inner iron ring and an outer iron ring formed by winding silicon steel sheets of different thicknesses, the inner iron ring and the outer iron ring are coaxially arranged, and the outer wall of the inner iron ring is in contact with the inner wall of the outer iron ring; the wall thickness of the inner iron ring is smaller than the wall thickness of the outer iron ring.

[0008] As a further optional solution, the wall thickness of the inner iron ring is 0.03-0.08 mm smaller than the wall thickness of the outer iron ring.

[0009] As a further optional solution, the wall thickness of the inner iron ring is 0.3 mm, and the wall thickness of the outer iron ring is 0.35 mm.

[0010] As a further optional solution, the wound closed ends of the inner iron ring and / or the outer iron ring are welded and fixed to form a closed ring. As a further optional solution, the inner iron ring and the outer iron ring are integrated as a whole, and the outer surface of the whole is provided with a vacuum impregnation layer.

[0011] As a further optional solution, the inner iron ring and the outer iron ring are arranged at the same height, and the inner corner of the inner iron ring and the outer corner of the outer iron ring are provided with chamfered corners.

[0012] As a further optional solution, the outer wall of the outer iron ring is provided with a plurality of wire grooves parallel to the axis, and the plurality of wire grooves are arranged circumferentially in a wave shape.

[0013] Beneficial effects of the utility model:

[0014] The utility model discloses a silicon steel sheet mixed winding iron core. Compared with the prior art, the inner iron ring and the outer iron ring are formed by winding silicon steel sheets with different thicknesses inside and outside, and the manufacturing cost is low and the processing is convenient. Furthermore, the thickness of the inner iron ring is small, so the magnetic resistance is small, the magnetic density is high, and the loss is low, so that the temperature rise and the loss of the inner iron ring and the outer iron ring tend to be balanced and uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of a silicon steel sheet mixed wound core in an embodiment.

[0016] Figure 2 It is a plan view of a silicon steel sheet mixed wound core in an embodiment.

[0017] Reference numerals:

[0018] Inner iron ring 1, outer iron ring 2. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] A silicon steel sheet mixed winding core of this embodiment, such as Figure 1 and Figure 2 As shown, it includes an inner iron ring 1 and an outer iron ring 2 formed by winding silicon steel sheets of different thicknesses, the inner iron ring 1 and the outer iron ring 2 are coaxially arranged, and the outer wall of the inner iron ring 1 is tightly attached to the inner wall of the outer iron ring 2 by interference fit. The wall thickness of the inner iron ring 1 is less than the wall thickness of the outer iron ring 2, and preferably the wall thickness of the inner iron ring 1 is 0.03-0.08 mm less than the wall thickness of the outer iron ring 2, for example, the wall thickness of the inner iron ring 1 is 0.3 mm, and the wall thickness of the outer iron ring 2 is 0.35 mm.

[0021] During manufacturing, a silicon steel strip of a preset thickness is first selected, and it can be wound first and then cut, or it can be cut to a preset length first and then wound, which is convenient to manufacture and low in cost. After winding and cutting, the wound closed ends of the inner iron ring 1 and the outer iron ring 2 are welded and fixed to form a closed ring.

[0022] In this embodiment, the inner iron ring 1 and the outer iron ring 2 are integrated as a whole, and the outer surface of the whole is provided with a vacuum impregnation layer. During processing, the entire iron core is vacuum impregnated and annealed in a high-temperature furnace, so that the magnetic leakage is small and the loss is low.

[0023] In this embodiment, the inner iron ring 1 and the outer iron ring 2 are arranged at the same height, and the inner corner of the inner iron ring 1 and the outer corner of the outer iron ring 2 are provided with chamfers. The chamfers are simplified and not shown in the accompanying drawings to facilitate smooth winding and avoid winding contact with right angles.

[0024] In practice, the outer wall of the outer iron ring 2 is provided with a plurality of wire grooves parallel to the axis, and the plurality of wire grooves are arranged circumferentially in a wave shape. During manufacturing, a plurality of grooves can be pressed out along the length direction on the flat silicon steel strip, and wire grooves can be naturally formed on the outer wall of the outer iron ring 2 after winding, so as to facilitate the positioning and winding of the copper wire during assembly.

[0025] The inner iron ring 1 is a silicon steel ring with equal wall thickness.

[0026] In actual processing, two silicon steel sheets of different materials are wound by a winding machine:

[0027] 1. The inner iron ring 1 is wound with 0.30mm oriented silicon steel sheets. The required properties of the inner silicon steel sheets are: the product performance is better than the outer iron ring 2, and the loss is lower than the outer iron core. For example, the models are: 30Q150, 30Q140, 30Q130, 30Q120.

[0028] 2. The outer iron ring 2 is wound with 0.35mm oriented silicon steel sheet. The required properties of the outer silicon steel sheet are: the loss is slightly larger than that of the inner iron ring, and close to that of the inner iron ring 1. For example, the models are: 35Q165, 35Q155, 35Q145, 35Q135.

[0029] Note: The above silicon steel sheets are selected from existing models, for example, the 35Q135 model means: 35 represents the material thickness of 0.35mm, 135 represents the maximum iron loss of 1.35W / kg when the magnetic induction is 17000 Gauss and the frequency is 50Hz. The meanings of other models are similar.

[0030] 3. Solve the problem of high temperature rise and high magnetic resistance on the inner side of the transformer by winding with high magnetic flux and low loss silicon steel sheets on the inner side; for example, the magnetic flux density of the transformer core is 15000 Gauss. In the existing common core, the losses on the inner and outer sides are the same, 1.8W / kg or 2.5W / kg, while the temperature rise on the inner side of the transformer is generally higher than that on the outer side; this causes an imbalance in the temperature rise inside and outside, a large magnetic resistance on the inner side, and an increase in copper loss; if the core made by the patent is used, when the magnetic flux density is 15000 Gauss, the loss of the inner core is 1.2W / kg, and the loss of the outer core is 1.55W / kg. The inner side of the transformer will have low loss and the temperature rise will be reduced to keep balance with the outer side because the core uses high magnetic density silicon steel sheets. The amount of copper wire used inside is small, and the copper loss is also reduced accordingly.

[0031] Compared with existing technologies:

[0032] 1. The magnetic flux leakage is small and the magnetic circuit is closed, so the magnetic flux leakage is small, while the EI core has a large number of joints and thus has a large magnetic flux leakage.

[0033] 2. High magnetic density, high efficiency, balanced temperature rise. The annular core is made of high-silicon grain-oriented silicon steel sheets. The magnetic flux density is 1.4-1.7T. The number of winding turns is small, which saves copper wire and more importantly reduces the internal resistance, greatly reducing the iron loss and copper loss. Therefore, the temperature rise inside and outside is balanced, which greatly improves the efficiency of the transformer;

[0034] 3. The overall performance is improved, the noise is low, the size is small, the weight is light, and it is economical and practical.

[0035] In the description of the present invention, it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the above detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the utility model.

[0037] In the description of the present utility model, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A silicon steel sheet mixed winding core, characterized by: It comprises an inner iron ring and an outer iron ring which are wound by silicon steel sheets of different thicknesses. The inner iron ring and the outer iron ring are coaxially arranged, and the outer wall of the inner iron ring fits the inner wall of the outer iron ring; the wall thickness of the inner iron ring is smaller than that of the outer iron ring.

2. The hybrid wound core of silicon steel sheets according to claim 1 is characterized in that: The wall thickness of the inner iron ring is 0.03-0.08 mm smaller than the wall thickness of the outer iron ring.

3. The hybrid wound core of silicon steel sheets according to claim 2 is characterized in that: The wall thickness of the inner iron ring is 0.3mm, and the wall thickness of the outer iron ring is 0.35mm.

4. The hybrid wound core of silicon steel sheets according to claim 1 is characterized in that: The rolled closed ends of the inner iron ring and / or the outer iron ring are welded and fixed to form a closed ring shape.

5. The hybrid wound core of silicon steel sheets according to claim 1 is characterized in that: The inner iron ring and the outer iron ring are formed as a whole, and a vacuum impregnation layer is arranged on the outer surface of the whole.

6. The hybrid wound core of silicon steel sheets according to claim 1 is characterized in that: The inner iron ring and the outer iron ring are arranged at the same height, and the inner corner of the inner iron ring and the outer corner of the outer iron ring are arranged with rounded corners.

7. The hybrid wound core of silicon steel sheets according to claim 1 is characterized in that: The outer wall of the outer iron ring is provided with a plurality of wire grooves parallel to the axis, and the plurality of wire grooves are arranged circumferentially in a wave shape.

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