Magnetic shielding device and transformer

Abstract

The utility model belongs to the technical field of transformers, and discloses a magnetic shielding device and a transformer. The magnetic shielding device comprises a first insulating protective plate, a magnetic shielding unit and a second insulating protective plate. A first cooling oil flowing channel is arranged on the first insulating protective plate; the number of the magnetic shielding units is multiple, the multiple magnetic shielding units are arranged on the first insulating protective plate, and an oil flow gap for cooling oil to flow is formed between every two adjacent magnetic shielding units; the second insulating protection plate covers all the magnetic shielding units, and a second cooling oil flowing channel is arranged on the second insulating protection plate. The magnetic shielding device is low in temperature rise and high in pressure bearing capacity and universality.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a magnetic shielding device and a transformer. Background Art

[0002] During operation, large-capacity oil-immersed power transformers generally generate leakage magnetic flux, which increases the loss of structural components and may cause local overheating. Therefore, in order to achieve low heat and low loss of the transformer, a magnetic shielding structure is generally provided in the transformer to shield the leakage magnetic flux.

[0003] At present, the magnetic shielding structure generally includes two types: the lobe-type magnetic shielding structure and the strip-type magnetic shielding structure. Among them, the lobe-type magnetic shielding structure is generally embedded in the pallet or pressing plate of the transformer body, with transverse lamination. The shape of the laminations is complex and variable, with different lengths, and the insulation structure is complex, resulting in difficult processing and assembly. Moreover, there is no specific cooling oil channel, resulting in a relatively high temperature rise, which affects the heat dissipation of the transformer. The strip-type magnetic shielding structure is directly placed on the surface of the pallet or pressing plate and is exposed in the insulating oil of the transformer. Without specific protection, it cannot withstand heavy pressure, is not conducive to lead wire arrangement in complex situations, and cannot meet the insulation distance requirements of the coil form with axial lead-out.

[0004] Therefore, it is urgent to propose a magnetic shielding device and a transformer to solve the above technical problems. Summary of the Utility Model

[0005] According to one aspect of the present utility model, the present utility model provides a magnetic shielding device having an insulating protection structure with a cooling oil flow channel, so that the temperature rise of the magnetic shielding device itself is relatively low, the pressure-bearing capacity is relatively high, and it can adapt to various lead-out forms of the coil and complex lead wire situations, with relatively high universality.

[0006] To achieve this purpose, the present utility model adopts the following technical solutions:

[0007] The magnetic shielding device includes:

[0008] A first insulating guard plate, on which a first cooling oil flow channel is provided;

[0009] A plurality of magnetic shielding units, which are provided on the first insulating guard plate, and there is an oil flow gap for cooling oil to flow between adjacent two of the magnetic shielding units;

[0010] A second insulating guard plate, covering all the magnetic shielding units, and a second cooling oil flow channel is provided on the second insulating guard plate.

[0011] Optionally, among the plurality of magnetic shielding units, the lengths of some of the magnetic shielding units are different; or, among the plurality of magnetic shielding units, the length of each magnetic shielding unit is different.

[0012] Optionally, the first cooling oil flow channel includes a plurality of first longitudinal oil paths and a plurality of first transverse oil paths, and the first longitudinal oil paths are in the same extending direction as the oil flow gap; and / or, the second cooling oil flow channel includes a plurality of second longitudinal oil paths and a plurality of second transverse oil paths, and the second longitudinal oil paths are in the same extending direction as the oil flow gap.

[0013] Optionally, the first cooling oil flow channel includes a plurality of first transverse oil paths; and / or, the second cooling oil flow channel includes a plurality of second transverse oil paths.

[0014] Optionally, a plurality of first insulating pads are provided on the first insulating guard plate, the plurality of first insulating pads are arranged at intervals, and the gaps between the plurality of first insulating pads form the first cooling oil flow channel, and the first insulating pads are in contact with the magnetic shielding unit; and / or, a plurality of second insulating pads are provided on the second insulating guard plate, the plurality of second insulating pads are arranged at intervals, and the gaps between the plurality of second insulating pads form the second cooling oil flow channel, and the second insulating pads are in contact with the magnetic shielding unit.

[0015] Optionally, a plurality of the magnetic shielding units form a magnetic shielding group, side insulating guard plates are provided on each side of the magnetic shielding group, and a third cooling oil flow channel is provided on at least part of the side insulating guard plates.

[0016] Optionally, the side insulating guard plate close to the iron core of the transformer includes at least two L-shaped guard plates, and the at least two L-shaped guard plates are assembled into a U-shaped protection structure, and the three protection parts of the U-shaped protection structure are respectively attached to the upper side, the side and the lower side of the magnetic shielding group.

[0017] Optionally, the magnetic shielding unit includes:

[0018] Magnetic shielding sheets, a plurality of which are provided, and the plurality of magnetic shielding sheets are stacked in sequence and bonded by epoxy resin to form a magnetic shielding plate;

[0019] A grounding sheet, connected to the outermost magnetic shielding sheet;

[0020] An insulating sheath, sleeved outside the magnetic shielding plate.

[0021] Optionally, through holes are provided on each of the magnetic shielding units, first connection holes corresponding to the through holes one by one are provided on the first insulating guard plate, and second connection holes corresponding to the through holes one by one are provided on the second insulating guard plate. The corresponding first connection holes, the through holes and the second connection holes form a connection hole group, and an insulating connecting piece is provided for each connection hole group; third connection holes corresponding to the connection hole groups one by one are provided on the mounting seat, and the insulating connecting piece passes through the connection hole group and the corresponding third connection hole to fix the magnetic shielding device on the mounting seat.

[0022] Optionally, the magnetic shielding unit includes a grounding piece, and grounding connection holes are provided on the grounding piece. A conductive connecting piece is provided for each grounding connection hole; fourth connection holes corresponding to the grounding connection holes one by one are provided on the mounting seat, and the conductive connecting piece passes through the grounding connection hole and the corresponding fourth connection hole to electrically connect the grounding piece to the mounting seat.

[0023] According to another aspect of the present invention, the present invention also provides a transformer, which includes an iron core, iron core clamping pieces arranged at both ends of the iron core, and the magnetic shielding device according to any one of the above technical solutions. A plurality of mounting seats are provided on the iron core clamping pieces, the plurality of mounting seats surround the iron core, and one magnetic shielding device is provided on each mounting seat.

[0024] Advantages of the present invention:

[0025] The present invention provides a magnetic shielding device, which includes a first insulating guard plate, a magnetic shielding unit and a second insulating guard plate. The first insulating guard plate and the second insulating guard plate form an insulating protection structure for protecting the magnetic shielding unit, so that the magnetic shielding device has a relatively high pressure-bearing capacity. A first cooling oil flow channel is provided on the first insulating guard plate, an oil flow gap for cooling oil to flow is provided between adjacent two magnetic shielding units, and a second cooling oil flow channel is provided on the second insulating guard plate, so that the contact area between the magnetic shielding device and the cooling oil is relatively large, and the heat dissipation is good, and further the temperature rise of the magnetic shielding device itself is relatively low.

[0026] Moreover, each magnetic shielding unit is independent of each other, and the size of each magnetic shielding unit can be adjusted according to actual needs, so that the magnetic shielding device can adapt to various wire outlet forms of the coil and complex lead situations, and has a relatively high universality.

[0027] The present invention also provides a transformer, which includes an iron core, iron core clamping pieces and the above magnetic shielding device. Since the above magnetic shielding device is adopted in the transformer, the loss and temperature rise are relatively low, the working reliability is relatively high, and the structural compactness is relatively high. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the content of the embodiments of the present invention and these drawings.

[0029] Figure 1 is an exploded schematic view of the magnetic shielding device provided by the embodiment of the present invention;

[0030] Figure 2 is a structural schematic view of the magnetic shielding device provided by the embodiment of the present invention;

[0031] Figure 3 is a partial schematic view of the magnetic shielding device provided by the embodiment of the present invention;

[0032] Figure 4 is a structural schematic view of a magnetic shielding group provided by the embodiment of the present invention;

[0033] Figure 5 is a structural schematic view of another magnetic shielding group provided by the embodiment of the present invention;

[0034] Figure 6 is a schematic view of the assembly process of the magnetic shielding unit provided by the embodiment of the present invention;

[0035] Figure 7 is a cross-sectional view of the assembly drawing of the magnetic shielding device and the mounting support provided by the embodiment of the present invention (the first insulating shield and the second insulating shield are not shown);

[0036] Figure 8 is Figure 7 a partial schematic view of;

[0037] Figure 9 is an assembly drawing of the iron core, the iron core clamping piece and the magnetic shielding device provided by the embodiment of the present invention.

[0038] In the figure:

[0039] 10. Iron core; 20. Iron core clamping piece; 21. Mounting support;

[0040] 100. First insulating shield; 110. First cooling oil flow channel; 111. First longitudinal oil path; 112. First transverse oil path; 120. First insulating spacer; 130. First connection hole;

[0041] 200. Magnetic shielding unit; 201. Magnetic shielding plate; 2011. Magnetic shielding sheet; 202. Grounding sheet; 2021. Grounding connection hole; 203. Insulating sheath; 210. Oil flow gap; 220. Through hole;

[0042] 300. Second insulating guard plate; 310. Second cooling oil flow channel; 311. Second longitudinal oil path; 312. Second transverse oil path; 320. Second connection hole;

[0043] 400. Side insulating guard plate; 410. Third cooling oil flow channel; 420. L-shaped guard plate; 430. C-shaped protection structure; 431. Protection part;

[0044] 500. Insulating connector;

[0045] 600. Conductive connector. Detailed implementation mode

[0046] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0047] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to" and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0048] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below" and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0049] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0050] This embodiment provides a magnetic shielding device for a transformer. The magnetic shielding device has an insulating protection structure with a cooling oil flow channel, so that the temperature rise of the magnetic shielding device itself is relatively low, the pressure-bearing capacity is relatively high, and it can adapt to various lead-out forms of the transformer coil and complex lead situations, with relatively high universality.

[0051] Specifically, as Figures 1 - 3 shown, the magnetic shielding device includes a first insulating guard plate 100, a magnetic shielding unit 200, and a second insulating guard plate 300. Among them, a first cooling oil flow channel 110 is provided on the first insulating guard plate 100. There are multiple magnetic shielding units 200, and the multiple magnetic shielding units 200 are arranged on the first insulating guard plate 100. There is an oil flow gap 210 for cooling oil to flow between two adjacent magnetic shielding units 200. The second insulating guard plate 300 covers all the magnetic shielding units 200, and a second cooling oil flow channel 310 is provided on the second insulating guard plate 300.

[0052] When this magnetic shielding device is used in a transformer, the magnetic shielding device will be immersed in the cooling oil of the transformer. The cooling oil can enter the interior of the magnetic shielding device through the first cooling oil flow channel 110, the oil flow gap 210, and the second cooling oil flow channel 310, perform heat exchange with the magnetic shielding device, and then cool down the magnetic shielding device, effectively avoiding a relatively high temperature rise of the magnetic shielding device, improving the reliability of the magnetic shielding device in shielding leakage magnetic flux, and further improving the reliability and stability of the transformer operation. Moreover, the first insulating guard plate 100 and the second insulating guard plate 300 form an insulating protection structure for protecting the magnetic shielding unit 200, so that the magnetic shielding device has a relatively high pressure-bearing capacity. In addition, each magnetic shielding unit 200 is independent of each other, and the size of each magnetic shielding unit 200 can be adjusted according to actual needs, so that the magnetic shielding device can adapt to various lead-out forms of the coil and complex lead situations, with relatively high universality.

[0053] Optionally, in a possible embodiment, the multiple magnetic shielding units 200 are arranged in sequence.

[0054] Further, continue to refer to Figure 1 and Figure 3, in a possible embodiment, the first cooling oil flow channel 110 includes a plurality of first longitudinal oil paths 111, and the first longitudinal oil paths 111 are in the same extending direction as the oil flow gap 210. In this way, the heat exchange area between the cooling oil and the first insulating guard plate 100 is relatively large, improving the heat exchange efficiency.

[0055] Optionally, the first longitudinal oil paths 111 can be arranged in one-to-one correspondence with the oil flow gap 210. With such an arrangement, the flow resistance of the cooling oil can be reduced, and the heat exchange efficiency can be improved.

[0056] Optionally, continue to refer to Figure 1 and Figure 3 , the first cooling oil flow channel 110 can further include a plurality of first transverse oil paths 112. By providing a plurality of first transverse oil paths 112, the heat exchange area between the first cooling oil flow channel 110 and the cooling oil can be increased, thereby improving the heat exchange efficiency.

[0057] Furthermore, continue to refer to Figure 3 , in another possible embodiment, the second cooling oil flow channel 310 includes a plurality of second longitudinal oil paths 311, and the second longitudinal oil paths 311 are in the same extending direction as the oil flow gap 210. In this way, the heat exchange area between the cooling oil and the second insulating guard plate 300 is relatively large, improving the heat exchange efficiency.

[0058] Optionally, the second longitudinal oil paths 311 can be arranged in one-to-one correspondence with the oil flow gap 210. With such an arrangement, the flow resistance of the cooling oil can be reduced, and the heat exchange efficiency can be improved.

[0059] Optionally, continue to refer to Figure 3 , the second cooling oil flow channel 310 can further include a plurality of second transverse oil paths 312. By providing a plurality of second transverse oil paths 312, the heat exchange area between the second cooling oil flow channel 310 and the cooling oil can be increased, thereby improving the heat exchange efficiency.

[0060] In this embodiment, the first cooling oil flow channel 110 includes a plurality of first longitudinal oil paths 111 and a plurality of first transverse oil paths 112, and the second cooling oil flow channel 310 includes a plurality of second longitudinal oil paths 311 and a plurality of second transverse oil paths 312.

[0061] Optionally, continue to refer to Figure 1, in a possible embodiment, a plurality of first insulating pads 120 are provided on the first insulating shield 100. The plurality of first insulating pads 120 are arranged at intervals, and the gaps between the plurality of first insulating pads 120 form a first cooling oil flow channel 110. The first insulating pads 120 are in contact with the magnetic shielding unit 200. By providing a plurality of first insulating pads 120 on the first insulating shield 100 to form the first cooling oil flow channel 110, the structure is simple, easy to process, reduces the manufacturing cost, and improves the processing efficiency of the magnetic shielding device. By arranging the magnetic shielding unit 200 on the first insulating pads 120, it can be avoided that the installation of the magnetic shielding unit 200 hinders the flow of the cooling oil in the first cooling oil flow channel 110, and the reliability of heat dissipation of the magnetic shielding device is improved.

[0062] Optionally, in another possible embodiment, a plurality of second insulating pads are provided on the second insulating shield 300. The plurality of second insulating pads are arranged at intervals, and the gaps between the plurality of second insulating pads form a second cooling oil flow channel 310. The second insulating pads are in contact with the magnetic shielding unit 200. By providing a plurality of second insulating pads on the second insulating shield 300 to form the second cooling oil flow channel 310, the structure is simple, easy to process, reduces the manufacturing cost, and improves the processing efficiency of the magnetic shielding device. Arranging the second insulating pads to be in contact with the magnetic shielding unit 200 can avoid that the installation of the magnetic shielding unit 200 hinders the flow of the cooling oil in the second cooling oil flow channel 310, and the reliability of heat dissipation of the magnetic shielding device is improved.

[0063] Furthermore, the magnetic shielding device is arranged along a circle formed by a coil. Generally, the magnetic shielding unit 200 protruding from the position of the circle where the coil is located has no magnetic shielding effect. Therefore, in order to reduce the material cost and the space occupation, in a possible embodiment, as Figure 4 and Figure 5 shown, among the plurality of magnetic shielding units 200, the lengths of some magnetic shielding units 200 are different. In this way, the positions of the magnetic shielding units 200 with different lengths can be arranged according to the requirements of the actual installation position to better fit the circle where the coil is located, reduce the waste of materials, and moreover, with such an arrangement, the lengths of some magnetic shielding units 200 are the same, which is convenient for processing together. However, Figure 4 and Figure 5 there are still certain defects in the fitting effect of these two schemes on the circle where the coil is located. Therefore, among the plurality of magnetic shielding units 200, the length of each magnetic shielding unit 200 can be set to be different, and according to the needs, the side of the magnetic shielding unit 200 facing the coil can be formed into an arc through arrangement, and the fitting effect is better.

[0064] Furthermore, as Figure 6As shown, the magnetic shielding unit 200 includes magnetic shielding sheets 2011, a grounding sheet 202, and an insulating sheath 203. Among them, multiple magnetic shielding sheets 2011 are provided. The multiple magnetic shielding sheets 2011 are stacked in sequence and bonded by epoxy resin to form a magnetic shielding plate 201. The grounding sheet 202 is connected to the outermost magnetic shielding sheet 2011. The insulating sheath 203 is sleeved outside the magnetic shielding plate 201. By bonding the magnetic shielding sheets 2011 with epoxy resin, compared with the connection between the magnetic shielding sheets 2011 achieved by welding in the prior art, the processing is more convenient, the material and labor costs are lower, and moreover, the thickness of the magnetic shielding sheets 2011 can be made thinner. By sleeving an insulating sheath 203 outside the magnetic shielding plate 201 formed by stacking multiple magnetic shielding sheets 2011, the insulation performance of the magnetic shielding unit 200 can be improved, thereby improving the working reliability of the magnetic shielding unit 200. By connecting the grounding sheet 202 to the outermost magnetic shielding sheet 2011, it is convenient to ground the magnetic shielding device.

[0065] Optionally, the insulating sheath 203 can be formed by folding cardboard, which is simple to process, low in cost, and has good insulation performance.

[0066] Optionally, the magnetic shielding sheet 2011 can be a silicon steel sheet.

[0067] Further, continue to refer to Figure 1 and Figure 2 , multiple magnetic shielding units 200 form a magnetic shielding group, and side insulating guard plates 400 are provided on each side of the magnetic shielding group. By providing the side insulating guard plates 400, the sides of the magnetic shielding group can be protected, and together with the first insulating guard plate 100 and the second insulating guard plate 300, all-round protection of the magnetic shielding group is achieved, greatly improving the pressure-bearing capacity of the magnetic shielding device.

[0068] Optionally, continue to refer to Figure 1 , in a possible embodiment, a third cooling oil flow channel 410 can be provided on the side insulating guard plate 400. By providing the third cooling oil flow channel 410, the contact area between the magnetic shielding device and the cooling oil can be increased, thereby improving the heat dissipation performance of the magnetic shielding device.

[0069] It can be understood that the third cooling oil flow channel 410 can be provided on each side insulating guard plate 400, or only on some side insulating guard plates 400, which can be set according to actual needs, and the present application does not make specific limitations.

[0070] Further, the third cooling oil flow channel 410 can include multiple vertical oil channels. Of course, the oil channel setting of the third cooling oil flow channel 410 can also be other, which can be set according to actual needs, and the present application does not make specific limitations.

[0071] Optionally, as Figure 1 and Figure 8 shown, in another possible embodiment, since the magnetic shielding device is generally disposed around the iron core 10 of the transformer, in order to avoid conductive contact between the magnetic shielding unit 200 and the iron core 10, a side insulating guard plate 400 close to the iron core 10 of the transformer is provided and includes at least two L-shaped guard plates 420. The at least two L-shaped guard plates 420 are assembled into a U-shaped protection structure 430. The three protection parts 431 of the U-shaped protection structure 430 are respectively attached to the upper side, the side of the magnetic shielding group, and the lower side of the magnetic shielding group. With such a setting, it is possible to wrap the edges of the magnetic shielding unit 200 close to the iron core 10, and the insulation effect is better. Moreover, by forming the U-shaped protection structure 430 with two L-shaped guard plates 420, compared with integrally forming the U-shaped protection structure 430, the L-shaped guard plate 420 close to the first insulating guard plate 100 can be installed first, then the magnetic shielding unit 200 is placed in sequence, and then the L-shaped guard plate 420 close to the second insulating guard plate 300 is installed, and then the second insulating guard plate 300 is installed. In this way, the installation of the magnetic shielding unit 200 is not restricted by the L-shaped guard plate 420, which is convenient for the installation of the magnetic shielding unit 200.

[0072] In this embodiment, two L-shaped guard plates 420 are provided. In other embodiments, a plurality of L-shaped guard plates 420 may also be provided according to the thickness of the L-shaped guard plate 420 and the required insulation performance requirements, such as three, four, five, etc., and can be set according to actual needs, and the present application does not make specific limitations.

[0073] Optionally, the L-shaped guard plate 420 can be formed by folding cardboard.

[0074] Further, continue to refer to Figure 1 、 Figure 2 and Figure 7 , in this embodiment, through holes 220 are provided on each magnetic shielding unit 200, first connection holes 130 corresponding to the through holes 220 one by one are provided on the first insulating guard plate 100, and second connection holes 320 corresponding to the through holes 220 one by one are provided on the second insulating guard plate 300. The corresponding first connection holes 130, through holes 220, and second connection holes 320 form a connection hole group, and an insulating connector 500 is provided for each connection hole group. Third connection holes corresponding to the connection hole groups one by one are provided on the mounting seat 21, and the insulating connector 500 passes through the connection hole group and the corresponding third connection hole to fix the magnetic shielding device on the mounting seat 21. The fixing of the magnetic shielding device on the mounting seat 21 is realized through the cooperation of the insulating connector 500 with the connection hole group and the third connection hole, and the structure is simple, and the installation and disassembly are relatively convenient.

[0075] Optionally, in a possible embodiment, the insulating connector 500 may be an insulating screw. Correspondingly, nuts are connected to both ends of the insulating screw protruding from the magnetic shielding device and the end protruding from the mounting seat 21.

[0076] Optionally, the number of through holes 220 on each magnetic shielding unit 200 may be one or multiple. In this embodiment, two through holes 220 are provided on each magnetic shielding unit 200. In other embodiments, the number of through holes 220 on each magnetic shielding unit 200 may also be one, three, etc., which can be set according to actual needs, and the present application does not make specific limitations.

[0077] It should be noted that since through holes 220 are provided on the magnetic shielding unit 200, during the lamination process of the magnetic shielding sheet 2011, the corresponding positions of the holes need to be ensured.

[0078] Further, referring to Figure 6 and Figure 7 , the magnetic shielding unit 200 includes a grounding sheet 202. A grounding connection hole 2021 is provided on the grounding sheet 202. Each grounding connection hole 2021 is correspondingly provided with a conductive connector 600. A fourth connection hole corresponding to the grounding connection hole 2021 is provided on the mounting seat 21. The conductive connector 600 passes through the grounding connection hole 2021 and the corresponding fourth connection hole to electrically connect the grounding sheet 202 to the mounting seat 21. The magnetic shielding unit 200 is grounded by connecting to the mounting seat 21 through the conductive connector 600, with a simple structure and convenient installation and disassembly.

[0079] Optionally, referring to Figure 1 again, in this embodiment, the grounding sheet 202 approaches the mounting seat 21 by bending. This setting is not only convenient for processing but also beneficial to improving the structural compactness of the magnetic shielding device and the space utilization rate of the transformer.

[0080] As Figures 7 - 9 shown, this embodiment also provides a transformer, which includes an iron core 10, iron core clamps 20 provided at both ends of the iron core 10, and the above-mentioned magnetic shielding device. Among them, a plurality of mounting seats 21 are provided on the iron core clamps 20. The plurality of mounting seats 21 surround the iron core 10, and a magnetic shielding device is provided on each mounting seat 21.

[0081] Since the above-mentioned magnetic shielding device is adopted in this transformer, the loss and temperature rise are relatively low, the working reliability is relatively high, and the structural compactness is relatively high. Moreover, surrounding the magnetic shielding device around the iron core 10 is beneficial to the comprehensiveness of magnetic shielding, thereby reducing the loss and temperature rise of the transformer and improving the stability and reliability of the transformer operation.

[0082] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A magnetic shielding device, characterized in that, Comprising: A first insulating shield (100) provided with a first cooling oil flow channel (110) thereon; Magnetic shielding units (200), a plurality of which are provided on the first insulating shield (100), and an oil flow gap (210) for the cooling oil to flow is formed between two adjacent magnetic shielding units (200); A second insulating shield (300) covering all the magnetic shielding units (200), and a second cooling oil flow channel (310) is provided on the second insulating shield (300).

2. The magnetic shielding device according to claim 1, characterized in that, Among the plurality of magnetic shielding units (200), the lengths of some of the magnetic shielding units (200) are different; or, among the plurality of magnetic shielding units (200), the length of each magnetic shielding unit (200) is different.

3. The magnetic shielding device according to claim 1, characterized in that, The first cooling oil flow channel (110) includes a plurality of first longitudinal oil paths (111) and a plurality of first transverse oil paths (112), and the first longitudinal oil paths (111) are in the same extending direction as the oil flow gap (210); and / or, the second cooling oil flow channel (310) includes a plurality of second longitudinal oil paths (311) and a plurality of second transverse oil paths (312), and the second longitudinal oil paths (311) are in the same extending direction as the oil flow gap (210).

4. The magnetic shielding device according to claim 1, characterized in that, A plurality of first insulating pads (120) are provided on the first insulating shield (100), the plurality of first insulating pads (120) are arranged at intervals, and the gaps between the plurality of first insulating pads (120) form the first cooling oil flow channel (110), and the first insulating pads (120) are in contact with the magnetic shielding units (200); and / or, a plurality of second insulating pads are provided on the second insulating shield (300), the plurality of second insulating pads are arranged at intervals, and the gaps between the plurality of second insulating pads form the second cooling oil flow channel (310), and the second insulating pads are in contact with the magnetic shielding units (200).

5. The magnetic shielding device according to claim 1, wherein The plurality of magnetic shielding units (200) form a magnetic shielding group, and side insulating shields (400) are provided on each side of the magnetic shielding group, and a third cooling oil flow channel (410) is provided on at least part of the side insulating shields (400).

6. The magnetic shielding device according to claim 5, characterized in that, The side insulating shield (400) close to the iron core (10) of the transformer includes at least two L-shaped shields (420), and the at least two L-shaped shields (420) are assembled into a U-shaped protection structure (430), and the three protection parts (431) of the U-shaped protection structure (430) are respectively attached to the upper side, the side and the lower side of the magnetic shielding group.

7. The magnetic shielding device according to any one of claims 1-6, characterized in that, The magnetic shielding unit (200) includes: Magnetic shielding sheets (2011), a plurality of which are provided, and the plurality of magnetic shielding sheets (2011) are stacked in sequence and bonded by epoxy resin to form a magnetic shielding plate (201); A grounding sheet (202) connected to the outermost magnetic shielding sheet (2011); An insulating sheath (203) sleeved outside the magnetic shielding plate (201).

8. The magnetic shielding device according to any one of claims 1-6, characterized in that, Each of the magnetic shielding units (200) is provided with a through hole (220). The first insulating guard plate (100) is provided with first connection holes (130) corresponding to the through holes (220) one by one. The second insulating guard plate (300) is provided with second connection holes (320) corresponding to the through holes (220) one by one. The corresponding first connection holes (130), through holes (220) and second connection holes (320) form a connection hole group, and each connection hole group is correspondingly provided with an insulating connector (500); the mounting seat (21) is provided with third connection holes corresponding to the connection hole groups one by one. The insulating connector (500) passes through the connection hole group and the corresponding third connection hole to fix the magnetic shielding device on the mounting seat (21).

9. The magnetic shielding device according to any one of claims 1-6, characterized in that, The magnetic shielding unit (200) includes a grounding plate (202). The grounding plate (202) is provided with grounding connection holes (2021), and each grounding connection hole (2021) is correspondingly provided with a conductive connector (600); the mounting seat (21) is provided with fourth connection holes corresponding to the grounding connection holes (2021) one by one. The conductive connector (600) passes through the grounding connection hole (2021) and the corresponding fourth connection hole to electrically connect the grounding plate (202) to the mounting seat (21).

10. A transformer, characterized in that, It includes an iron core (10), iron core clamps (20) arranged at both ends of the iron core (10), and the magnetic shielding device according to any one of claims 1-9. The iron core clamps (20) are provided with a plurality of mounting seats (21). The plurality of mounting seats (21) surround the iron core (10), and each mounting seat (21) is provided with one of the magnetic shielding devices.

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