Transformer with optimized shielding plate structure

Abstract

The utility model relates to the technical field of low-frequency transformers, in particular to a transformer with an optimized shielding plate structure. The transformer comprises a magnetic core with a rectangular cross section, and a winding transversely wound on the magnetic core, an independently-installed shielding plate is arranged on the outer side of the magnetic core and installed in the middle of the outer side face of the magnetic core, and the distance between the edge of the shielding plate and the magnetic core is equal, or a certain interval is formed between the edge of the shielding plate and at least one side edge. The shielding plate at least covers one outer side face of the magnetic core. According to the utility model, by optimizing the size of the shielding plate and positioning the shielding plate in the middle magnetic leakage concentration area of the outer side surface of the magnetic core, the economical efficiency of electromagnetic shielding is realized, and meanwhile, material waste caused by full coverage is avoided; the installation number of the shielding plates on the outer side face of the magnetic core is selected according to the noise direction needing to be shielded of the transformer, electromagnetic shielding flexibility is achieved, and adaptability of the transformer is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to low frequency transformer technical field, concretely relates to a transformer with optimized shield plate structure. BACKGROUND

[0002] In the operation process of the traditional transformer, the outer side surface of the rectangular magnetic core and the winding will inevitably release leakage magnetic flux outward, which will induce the vibration of the near-distance magnetic conductive material due to the magnetic field attraction, and further generate noise. The magnetic core leakage magnetic flux problem has become a key factor restricting the performance and efficiency improvement of the transformer. In order to alleviate this problem, the industry generally adopts the strategy of setting the shield plate around the magnetic core. Chinese patent CN214068540U discloses a low-noise transformer, which is configured with an L-shaped shield plate outside the transformer body for effectively shielding the leakage magnetic flux. However, this scheme faces a dilemma in actual application: on the one hand, the oversized shield plate not only increases the material cost, but also causes unnecessary energy consumption due to excessive shielding; on the other hand, if the size is too small, the leakage magnetic flux cannot be fully shielded, which will negatively affect the overall performance of the transformer. SUMMARY

[0003] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a transformer with an optimized shield plate structure.

[0004] The technical scheme adopted by the utility model is as follows:

[0005] A transformer with an optimized shield plate structure, comprising a magnetic core with a rectangular cross section and a winding wound horizontally on the magnetic core; the outer side of the magnetic core is provided with an independently installed shield plate, the shield plate is installed at the middle of the outer side surface of the magnetic core, and the edge of the shield plate is equal to or at least has a certain interval with one side of the magnetic core; the shield plate covers at least one outer side surface of the magnetic core.

[0006] The technical scheme optimizes the size and installation position of the shielding plate, effectively reduces magnetic leakage, and controls the manufacturing cost of the shielding plate. Specifically, when the transformer is running, the outer side surface of the rectangular magnetic core and the winding release magnetic leakage to the external space, causing the magnetic field to attract the magnetic conductive material in the close distance to vibrate and further cause noise. Experiments show that the middle part of the outer side surface of the magnetic core is a magnetic leakage concentration area, and the magnetic leakage at the side ridge is small. Therefore, a shielding plate that fully covers the outer side surface can be designed, or a shielding plate with a size that is appropriately reduced but still effectively covers the outer side surface can be arranged. According to the direction of the magnetic conductive material to be shielded, the independently installed shielding plate can accurately capture and guide the magnetic leakage, reduce the electromagnetic interference on the magnetic conductive material, and thus avoid noise generation. By reasonably arranging the position and size of the shielding plate, the electromagnetic field distribution can be optimized to ensure that the electromagnetic energy is mainly transmitted efficiently between the winding and the magnetic core, and energy loss is reduced. The rectangular metal plate is selected as the shielding plate, which is suitable for the shape of the magnetic core and is convenient for processing and installation. The high conductivity of the metal is used to capture and guide the magnetic leakage. In addition, welding points are arranged at the four corners of the shielding plate to ensure that the shielding plate is firmly connected with the magnetic core, preventing loosening or falling off due to vibration or temperature change, and improving the stability of the transformer.

[0007] In addition, the transformer with the optimized shielding plate structure according to the above-mentioned technical scheme has the following additional technical features:

[0008] According to an embodiment of the present application, the winding penetrates through the front and rear sides of the magnetic core.

[0009] According to an embodiment of the present application, the outer side surface includes the top surface, the left side surface and the right side surface of the magnetic core, and the number of shielding plates to be installed is selected according to the direction of the noise to be shielded by the transformer.

[0010] The technical scheme realizes the flexibility of electromagnetic shielding by selecting the number of shielding plates to be installed on the outer side surface (including the top surface, the left side surface and the right side surface) of the magnetic core according to the direction of the noise to be shielded by the transformer.

[0011] According to an embodiment of the present application, the magnetic leakage at the side ridge of the magnetic core is negligible, and the magnetic leakage at the middle part of the outer side surface of the magnetic core is shielded by the shielding plate.

[0012] The technical scheme effectively reduces electromagnetic interference and energy loss by neglecting the magnetic leakage at the side ridge of the magnetic core and concentrating on shielding the magnetic leakage at the middle part of the outer side surface of the magnetic core.

[0013] According to an embodiment of the present application, the bottom of the magnetic core is provided with a bottom plate, and the lower edge of the shielding plate is connected with the bottom plate.

[0014] The technical scheme optimizes the installation mode of the shielding plates on the left and right sides, connects them with the bottom plate below, and increases the combination mode of the shielding plates. If necessary, the bottom plate and the shielding plate adopt an integrated structure.

[0015] According to one embodiment of the utility model, four end corners of the shielding plate are respectively provided with a welding point.

[0016] The technical scheme sets one welding point at each of the four end corners of the shielding plate, ensures firm connection between the shielding plate and the magnetic core, and improves stability of the transformer.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] (1) By optimizing the size of the shielding plate, the shielding plate is positioned at the middle leakage magnetic concentration area of the outer side of the magnetic core, economic electromagnetic shielding is realized, and material waste caused by full coverage is avoided.

[0019] (2) The number of shielding plates on the outer side of the magnetic core is selected according to the noise direction that needs to be shielded by the transformer, flexibility of electromagnetic shielding is realized, and adaptability of the transformer is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is one of the structural schematic diagrams of the utility model.

[0021] Figure 2 is the second structural schematic diagram of the utility model.

[0022] Figure 3 is the third structural schematic diagram of the utility model.

[0023] Figure 4 is the fourth structural schematic diagram of the utility model.

[0024] Figure 5 is the fifth structural schematic diagram of the utility model.

[0025] In the drawing: 1, magnetic core; 2, winding; 3, shielding plate. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] Embodiment 1

[0028] As Figures 1 to 3As shown, the embodiment provides a transformer with an optimized shielding plate structure, comprising a magnetic core 1 with a rectangular cross section, and a winding 2 transversely wound on the magnetic core 1; the outer side of the magnetic core 1 is provided with an independently installed shielding plate 3, the shielding plate 3 is installed at the middle of the outer side of the magnetic core 1, and the edge of the shielding plate 3 is equal to the edge of the magnetic core 1 or at least has a certain interval with one side; the shielding plate 3 covers at least one outer side of the magnetic core 1.

[0029] The technical solution effectively reduces magnetic leakage by optimizing the size and installation position of the shielding plate 3, while controlling the manufacturing cost of the shielding plate 3. Specifically, when the transformer is running, the outer side of the rectangular magnetic core 1 and the winding 2 will release magnetic leakage to the external space, causing the nearby magnetic conductive material to vibrate due to the magnetic field attraction, thereby causing noise; experiments show that the middle of the outer side of the magnetic core 1 is the magnetic leakage concentration area, and the magnetic leakage at the side is smaller. Therefore, a shielding plate that fully covers the outer side can be designed, or a shielding plate with a size that is appropriately reduced but still effectively covers the outer side can be provided. According to the direction of the magnetic conductive material that needs to be shielded, the independently installed shielding plate 3 can accurately capture and guide the magnetic leakage, reducing the electromagnetic interference on the magnetic conductive material, thereby avoiding the generation of noise; by reasonably setting the position and size of the shielding plate 3, the electromagnetic field distribution can be optimized to ensure that the electromagnetic energy is efficiently transmitted mainly between the winding 2 and the magnetic core 1, reducing energy loss; the rectangular metal plate is selected as the shielding plate 3, which not only fits the shape of the magnetic core 1, but also is easy to process and install; the high electrical conductivity of the metal is used to capture and guide the magnetic leakage; in addition, welding points are provided at the four corners of the shielding plate 3 to ensure that it is firmly connected with the magnetic core 1, preventing loosening or falling off due to vibration or temperature changes, and improving the stability of the transformer.

[0030] For example, the size of the right side of the magnetic core 1 is 60mm*60mm, and the size of the shielding plate 3 is 56mm*56mm, so the distance between the edge of the shielding plate 3 and the side is 2mm. The above size is only an illustration of the present application, and is not a limitation of the present application.

[0031] In addition, the transformer with an optimized shielding plate structure according to the above-mentioned embodiment of the present application also has the following additional technical features:

[0032] According to one embodiment of the present application, the winding 2 penetrates the front and rear sides of the magnetic core 1.

[0033] According to one embodiment of the present application, the outer side includes the top surface, the left side, and the right side of the magnetic core 1, and the number of shielding plates 3 is selected according to the direction of the noise that needs to be shielded by the transformer.

[0034] The technical solution realizes the flexibility of electromagnetic shielding by selecting the number of shielding plates 3 on the outer side (including the top surface, the left side, and the right side) of the magnetic core 1 according to the direction of the noise that needs to be shielded by the transformer.

[0035] According to one embodiment of the present invention, the magnetic leakage at the side edge of the magnetic core 1 is negligible, and the magnetic leakage at the middle of the outer side of the magnetic core 1 is shielded by the shielding plate 3.

[0036] This technical solution effectively reduces electromagnetic interference and energy loss by ignoring the magnetic leakage at the side edge of the magnetic core 1 and concentrating on shielding the magnetic leakage in the middle of the outer side of the magnetic core 1.

[0037] According to one embodiment of the present invention, a welding point is provided at each of the four corners of the shielding plate 3.

[0038] This technical solution ensures a firm connection between the shielding plate 3 and the magnetic core 1 by setting a welding point at each of the four corners of the shielding plate 3, thereby improving the stability of the transformer.

[0039] Example 2

[0040] The installation position of the shielding plate 3 will be explained below with reference to the attached diagram.

[0041] like Figure 1 As shown, a shielding plate 3 is provided on the side of the magnetic core 1. The plate is at a certain distance from the side edge of the magnetic core 1 on all sides. It is used to shield the leakage magnetic field facing the right side, thereby reducing the noise impact on the magnetic conductive material on the right side.

[0042] like Figure 2 As shown, a shielding plate 3 is provided on the top of the magnetic core 1. The plate is at a certain distance from the side edge of the magnetic core 1 on all sides. It is used to shield the leakage magnetic field facing the right side, thereby reducing the noise impact on the top magnetic conductive material.

[0043] like Figure 3 As shown, the magnetic core 1 is provided with three shielding plates 3, which are all a certain distance away from the side ribs of the magnetic core 1. They are installed on the outside and the top respectively to shield the leakage magnetic field facing the top and the left and right sides, thereby reducing the noise impact on the magnetic conductive materials on the top and the left and right sides.

[0044] like Figure 4 As shown, the magnetic core 1 is provided with a shielding plate 3 to shield the leakage magnetic field facing the right. Its three edges are a certain distance from the side ridges of the magnetic core 1, but the bottom edge is connected to the base plate. If necessary, the base plate and the shielding plate 3 adopt an integrated structure.

[0045] like Figure 5 As shown, the magnetic core 1 is equipped with two shielding plates 3 to shield the leakage magnetic field facing the top and right side. The three edges of the shielding plates are a certain distance from the side ridges of the magnetic core 1, but the two shielding plates are connected by one edge. If necessary, the two shielding plates can be integrated into a single unit. Alternatively, all three shielding plates can be integrated into a single unit.

[0046] The usage process of the above embodiments is as follows:

[0047] As Figures 1 to 5 shown, when the transformer is running, the current generates a magnetic field in the magnetic core 1 through the winding 2, realizing the conversion of electric energy, and the outer side of the magnetic core 1 and the winding 2 will release leakage magnetic field to the external space, causing the magnetic conductive material to be attracted by the magnetic field and vibrate and produce noise; in order to reduce this phenomenon, an independently installed shielding plate 3 is arranged in the middle of the outer side of the magnetic core 1, the shielding plate 3 is used to guide the leakage magnetic field, effectively reducing the electromagnetic interference on the magnetic conductive material, thereby avoiding the generation of noise;

[0048] When installed, the shielding plate 3 is reasonably arranged in position and size, optimizing the distribution of the electromagnetic field, ensuring that the electromagnetic energy is mainly transmitted between the winding 2 and the magnetic core 1, reducing energy loss; the shielding plate 3 is made of a rectangular metal plate, which not only fits the shape of the magnetic core 1, but also is convenient for processing and installation, and the high conductivity of the metal is used to capture and guide the leakage magnetic field; welding points are also arranged at the four end corners of the shielding plate 3, to ensure the firm connection between the shielding plate 3 and the magnetic core 1, prevent loosening or falling off due to vibration or temperature change, and improve the stability of the transformer. In addition, according to the direction of the noise to be shielded by the transformer, different numbers of shielding plates 3 are selected to be installed on different outer sides of the magnetic core 1, to realize the flexibility of electromagnetic shielding.

[0049] Although the utility model has been described in detail by referring to the attached drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model, and these modifications or replacements should be within the scope of the utility model. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A transformer having an optimized shield plate structure, characterized by, The magnetic core (1) has a rectangular cross section, and the winding (2) is wound on the magnetic core (1) transversely; the outer side of the magnetic core (1) is provided with an independently installed shielding plate (3), the shielding plate (3) is installed on the middle of the outer side of the magnetic core (1), the edge of the shielding plate (3) is equal to the edge of the magnetic core (1), or at least has a certain interval with one side; the shielding plate (3) covers at least one outer side of the magnetic core (1).

2. The transformer having an optimized shield plate structure according to claim 1, wherein, The winding (2) penetrates the front and back sides of the magnetic core (1).

3. The transformer having an optimized shield plate structure according to claim 1, wherein, The outer side includes the top side, the left side and the right side of the magnetic core (1), and the number of the shielding plates (3) is selected according to the noise direction to be shielded by the transformer.

4. The transformer having an optimized shield plate structure according to claim 1 or 3, wherein, The leakage magnetic field at the side of the magnetic core (1) is negligible, and the leakage magnetic field in the middle of the outer side of the magnetic core (1) is shielded by the shielding plate (3).

5. The transformer having an optimized shield plate structure according to claim 1, wherein, The bottom of the magnetic core (1) is provided with a bottom plate, and the lower edge of the shielding plate (3) is connected with the bottom plate.

6. The transformer having an optimized shield plate structure according to claim 1, wherein, Each of the four end corners of the shielding plate (3) is provided with a welding point.

Images