Magnetic shielding plate, air-core reactor assembly and electrical equipment

Abstract

The utility model discloses a magnetic shielding plate, an air-core reactor assembly and electrical equipment. The magnetic shielding plate comprises a first heat dissipation plate, at least one silicon steel sheet layer and a second heat dissipation plate; the at least one silicon steel sheet layer is stacked on the first heat dissipation plate; the second heat dissipation plate is stacked on the side, away from the first heat dissipation plate, of the silicon steel sheet layer so that at least one silicon steel sheet layer can be clamped between the first heat dissipation plate and the heat dissipation plate. According to the technical scheme, the magnetic shielding plate is light in weight and good in heat dissipation effect.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic shielding structures, in particular to a magnetic shielding plate, an air-core reactor and electrical equipment. Background Art

[0002] Air-core reactors are widely used in rail transit electrical equipment. Their advantages are that there is no saturation phenomenon, the inductance curve is stable, and it is not affected by the DC current. Their disadvantages are that the magnetic leakage is large and interferes with surrounding sensitive equipment. In rail transit electrical equipment, it is especially harmful to people with pacemakers. In order to suppress the magnetic flux density at 30cm above the floor of the carriage to not exceed 0.8mT, a magnetic shielding plate needs to be installed on the upper side of the air-core reactor.

[0003] In the related art, the magnetic shielding plate is usually a carbon steel plate or a silicon steel sheet. When the magnetic shielding plate is a carbon steel plate, in order to achieve the required magnetic shielding effect, the thickness of the carbon steel plate needs to be set relatively large, resulting in heavy weight, which is not conducive to the lightweight design of electrical equipment; while when the magnetic shielding plate is a silicon steel sheet, although it does not need to be set to a large thickness, the heat dissipation effect of the silicon steel sheet is poor. Utility Model Content

[0004] The main purpose of the utility model is to provide a magnetic shielding plate, aiming to provide a magnetic shielding plate with light weight and good heat dissipation effect.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a magnetic shielding plate, comprising:

[0006] a first heat sink;

[0007] At least one layer of silicon steel sheet, at least one layer of the silicon steel sheet is stacked on the first heat sink;

[0008] The second heat sink is stacked on a side of the silicon steel sheet away from the first heat sink, so that at least one layer of the silicon steel sheet is sandwiched between the first heat sink and the heat sink.

[0009] In one embodiment of the present invention, the first heat sink and / or the second heat sink is an aluminum alloy plate.

[0010] In an embodiment of the present invention, the edge of the silicon steel sheet layer is recessed in the edge of the first heat sink plate and the edge of the second heat sink plate.

[0011] In one embodiment of the utility model, a gap is formed between the edge of the silicon steel sheet layer and a side of the first heat sink close to the second heat sink and a side of the second heat sink close to the first heat sink, and the gap is filled with sealant.

[0012] In one embodiment of the utility model, an anti-corrosion layer is provided on the surface of the silicon steel sheet layer;

[0013] And / or, the surface of the first heat sink is provided with an anti-corrosion layer;

[0014] And / or, an anti-corrosion layer is provided on the surface of the second heat dissipation plate.

[0015] In an embodiment of the present invention, the silicon steel sheet layer is provided with multiple layers, and the multiple layers of the silicon steel sheet layer are stacked between the first heat sink and the second heat sink.

[0016] In one embodiment of the utility model, the magnetic shielding plate also includes a fixing part, the first heat dissipation plate is provided with a first fixing hole, the silicon steel sheet layer is provided with a second fixing hole, the second heat dissipation plate is provided with a third fixing hole, and the fixing part is sequentially passed through the first fixing hole, the second fixing hole and the third fixing hole.

[0017] In one embodiment of the utility model, the first heat sink is further provided with a first mounting hole, the silicon steel sheet layer is further provided with a second mounting hole, and the second heat sink is further provided with a third mounting hole. The first mounting hole, the second mounting hole and the third mounting hole are used to cooperate with the mounting piece to be installed on the bracket.

[0018] The utility model also proposes a hollow reactor assembly, including a hollow reactor, a bracket and the magnetic shielding plate as described above, wherein the magnetic shielding plate and the hollow reactor are both connected to the bracket, and the hollow reactor is defined to have an upper side close to the bottom plate of the vehicle compartment, and the magnetic shielding plate is located on the upper side of the hollow reactor.

[0019] The utility model also provides an electrical device, comprising the air-core reactor as described above.

[0020] In the magnetic shielding plate proposed by the utility model, by setting at least one layer of silicon steel sheet layer, the silicon steel sheet layer can play a role of magnetic shielding. Since the magnetic shielding effect of the silicon steel sheet layer is good, a thinner silicon steel sheet layer can be set to achieve the required magnetic shielding effect, so that the weight of the magnetic shielding plate is lighter, which is beneficial to the lightweight design of electrical equipment; in addition, by sandwiching the silicon steel sheet layer between the first heat sink and the second heat sink, the heat generated by the silicon steel sheet layer during operation can be conducted to the first heat sink and the second heat sink, so as to increase the heat dissipation area of ​​the silicon steel sheet layer through the first heat sink and the second heat sink, which can effectively improve the heat dissipation effect of the silicon steel sheet layer. Therefore, the magnetic shielding plate provided by the present scheme is light in weight and has a good heat dissipation effect.

[0021] In addition, by sandwiching the silicon steel sheet layer between the first heat sink and the second heat sink, the silicon steel sheet layer can also be reinforced and fixed by the first heat sink and the second heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 It is a front view of an embodiment of the magnetic shielding plate of the utility model;

[0024] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0025] Figure 3 It is a right side view of an embodiment of the magnetic shielding plate of the utility model;

[0026] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0027] Figure 5 A bottom view of an embodiment of a magnetic shielding plate of the utility model;

[0028] Figure 6 It is an exploded view of an embodiment of a magnetic shielding plate of the present invention.

[0029] Description of Figure Numbers:

[0030] Label name Label name 100 Magnetic shielding plate 21 Second fixing hole 10 First heat sink 22 Second mounting hole 11 First fixing hole 30 Second heat sink 12 First mounting hole 31 The third fixing hole 20 Silicon steel sheet 32 The third mounting hole 20a gap 40 Fixings

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] The utility model provides a magnetic shielding plate 100 , aiming to provide a magnetic shielding plate 100 with light weight and good heat dissipation effect.

[0036] Combined with reference Figures 1 to 6 In one embodiment of the magnetic shielding plate 100 of the utility model, the magnetic shielding plate 100 includes a first heat dissipation plate 10, at least one layer of silicon steel sheet 20 and a second heat dissipation plate 30; at least one layer of silicon steel sheet 20 is stacked on the first heat dissipation plate 10; the second heat dissipation plate 30 is stacked on the side of the silicon steel sheet 20 away from the first heat dissipation plate 10, so that at least one layer of silicon steel sheet 20 is sandwiched between the first heat dissipation plate 10 and the heat dissipation plate.

[0037] It can be understood that in the magnetic shielding plate 100 proposed in the present invention, by setting at least one layer of silicon steel sheet layer 20, the silicon steel sheet layer 20 can play a role of magnetic shielding. Since the magnetic shielding effect of the silicon steel sheet layer 20 is good, a thinner silicon steel sheet layer 20 can be set to achieve the required magnetic shielding effect, so that the magnetic shielding plate 100 is lighter, which is beneficial to the lightweight design of electrical equipment; in addition, by sandwiching the silicon steel sheet layer 20 between the first heat sink 10 and the second heat sink 30, the heat generated by the silicon steel sheet layer 20 during operation can be conducted to the first heat sink 10 and the second heat sink 30, so as to increase the heat dissipation area of ​​the silicon steel sheet layer 20 through the first heat sink 10 and the second heat sink 30, which can effectively improve the heat dissipation effect of the silicon steel sheet layer 20. Therefore, the magnetic shielding plate 100 provided by this scheme is light in weight and has good heat dissipation effect.

[0038] In addition, by sandwiching the silicon steel sheet layer 20 between the first heat sink 10 and the second heat sink 30 , the silicon steel sheet layer 20 can also be reinforced and fixed by the first heat sink 10 and the second heat sink 30 .

[0039] In actual application, the silicon steel sheet layer 20 may be provided with one layer or multiple layers, which may be determined according to actual magnetic shielding requirements.

[0040] In actual application, the connection between the first heat sink 10 and the silicon steel sheet 20 and between the second heat sink 30 and the silicon steel sheet 20 can be achieved by bonding, plugging, clamping, bolting or rivet connection.

[0041] In actual application, the size of the silicon steel sheet layer 20 may be smaller than or equal to the size of the first heat sink 10, or smaller than or equal to the size of the second heat sink 30. Furthermore, the sizes of the first heat sink 10 may be equal or different.

[0042] In actual application, the material of the first heat sink 10 and / or the second heat sink 30 may be a material with good thermal conductivity, such as aluminum alloy, graphene, and copper.

[0043] Optionally, see Figures 1 to 6 In one embodiment of the magnetic shielding plate 100 of the present invention, the first heat dissipation plate 10 and / or the second heat dissipation plate 30 are aluminum alloy plates.

[0044] In this configuration, since aluminum alloy has good thermal conductivity and high hardness, by using aluminum alloy plates as the first heat sink 10 and / or the second heat sink 30, it can be ensured that the first heat sink 10 and the second heat sink 30 have good thermal conductivity and high hardness, which can improve the heat dissipation effect of the silicon steel sheet layer 20 and the reliability of reinforcement.

[0045] Optionally, see Figure 2 , Figure 4 In one embodiment of the magnetic shielding plate 100 of the utility model, the edge of the silicon steel sheet layer 20 is recessed at the edge of the first heat sink 10 and the edge of the second heat sink 30. That is, the size of the silicon steel sheet layer 20 is smaller than the size of the first heat sink 10 and the second heat sink 30, so that the risk of damage to the end surface of the silicon steel sheet layer 20 due to impact during operation can be avoided.

[0046] Specifically, the distance between the edge of the silicon steel sheet layer 20 and the edge of the first heat sink 10 can be 3mm to 5mm, for example, it can be 3mm, 3.6mm, 4mm, 4.3mm, 5mm, etc.; similarly, the distance between the edge of the silicon steel sheet layer 20 and the edge of the second heat sink 30 can also be 3mm to 5mm, for example, it can be 3mm, 3.6mm, 4mm, 4.3mm, 5mm, etc.

[0047] Optionally, see Figure 2 , Figure 4In one embodiment of the magnetic shielding plate 100 of the utility model, a gap 20a is formed between the edge of the silicon steel sheet layer 20 and the side of the first heat sink 10 close to the second heat sink 30 and the side of the second heat sink 30 close to the first heat sink 10, and the gap 20a is filled with sealant (not shown).

[0048] Since the thickness of the silicon steel sheet layer 20 is relatively thin, the end surface of the silicon steel sheet layer 20 may be insufficiently surface treated. Therefore, by filling the gap 20a formed between the edge of the silicon steel sheet layer 20 and the side of the first heat sink 10 close to the second heat sink 30 and the side of the second heat sink 30 close to the first heat sink 10 with sealant, the end surface of the silicon steel sheet layer 20 can be supplementarily treated with the sealant, which can greatly reduce the possibility of corrosion of the end surface of the silicon steel sheet layer 20; in addition, the setting of the sealant can play a buffering role, which can avoid the risk of the end surface of the silicon steel sheet layer 20 being affected by impact and vibration and falling apart during operation.

[0049] Optionally, see Figures 1 to 6 In one embodiment of the magnetic shielding plate 100 of the present invention, the surface of the silicon steel sheet layer 20 is provided with an anti-corrosion layer (not shown); and / or, the surface of the first heat sink 10 is provided with an anti-corrosion layer; and / or, the surface of the second heat sink 30 is provided with an anti-corrosion layer.

[0050] In this way, during the manufacturing process, an anti-corrosion treatment is performed on the surface of the silicon steel sheet layer 20, and / or the surface of the first heat sink 10, and / or the surface of the second heat sink 30 to form an anti-corrosion layer on the surface of the silicon steel sheet layer 20, and / or the surface of the first heat sink 10, and / or the surface of the second heat sink 30. The setting of the anti-corrosion layer can avoid electrochemical corrosion caused when dissimilar metals are connected.

[0051] Specifically, the surface of the silicon steel sheet layer 20, and / or the surface of the first heat sink 10, and / or the surface of the second heat sink 30 may be subjected to anti-corrosion treatment by spraying paint, powder spraying or the like to form an anti-corrosion layer on the corresponding surfaces.

[0052] Optionally, see Figures 1 to 6 In one embodiment of the magnetic shielding plate 100 of the present invention, the silicon steel sheet layer 20 is provided with multiple layers, and the multiple silicon steel sheet layers 20 are stacked between the first heat dissipation plate 10 and the second heat dissipation plate 30 .

[0053] In this way, by providing the multi-layer silicon steel sheet layers 20 between the first heat sink 10 and the second heat sink 30 , the magnetic shielding plate 100 can have a higher magnetic shielding effect and can fully meet the use requirements.

[0054] It should be noted that the sizes and thicknesses of the multiple silicon steel sheet layers 20 may be the same or different.

[0055] Optionally, see Figure 1 , Figure 3 , Figure 5 , Figure 6 In one embodiment of the magnetic shielding plate 100 of the utility model, the magnetic shielding plate 100 also includes a fixing member 40, the first heat dissipation plate 10 is provided with a first fixing hole 11, the silicon steel sheet layer 20 is provided with a second fixing hole 21, and the second heat dissipation plate 30 is provided with a third fixing hole 31, and the fixing member 40 is sequentially penetrated through the first fixing hole 11, the second fixing hole 21 and the third fixing hole 31.

[0056] With such arrangement, the fixing member 40 can be used to sequentially penetrate the first fixing hole 11 of the first heat sink 10, the second fixing hole 21 of the silicon steel sheet layer 20, and the third fixing hole 31 of the third heat sink, so that the first heat sink 10, the silicon steel sheet layer 20 and the second heat sink 30 can be fixed together to ensure the connection reliability between the first heat sink 10, the silicon steel sheet layer 20 and the second heat sink 30.

[0057] Specifically, the fixing member 40 may be a structural member such as a bolt or a rivet.

[0058] In some embodiments, in order to further improve the connection reliability between the first heat sink 10, the silicon steel sheet layer 20 and the second heat sink 30, the first heat sink 10 can be provided with a plurality of first fixing holes 11 arranged at intervals, the silicon steel sheet layer 20 can be provided with a plurality of second fixing holes 21 arranged at intervals, the second heat sink 30 can be provided with a plurality of third fixing holes 31 arranged at intervals, and there can be a plurality of fixing members 40, and then each fixing member 40 is successively passed through a first fixing hole 11, a second fixing hole 21 and a third fixing hole 31, so as to perform multi-position fixation through multiple fixing members 40.

[0059] It should be noted that the distribution of the plurality of fixing members 40 is not specifically limited. Optionally, both the periphery and the middle of the silicon steel sheet layer 20 can be fixed by at least one fixing member 40 .

[0060] Optionally, see Figure 5 , Figure 6 In one embodiment of the magnetic shielding plate 100 of the utility model, the first heat dissipation plate 10 is also provided with a first mounting hole 12, the silicon steel sheet layer 20 is also provided with a second mounting hole 22, and the second heat dissipation plate 30 is also provided with a third mounting hole 32. The first mounting hole 12, the second mounting hole 22 and the third mounting hole 32 are used to cooperate with the mounting piece to be installed on the bracket.

[0061] With such arrangement, during the assembly process, the magnetic shielding plate 100 can be fixedly mounted on the bracket of the electrical device by using the mounting member in cooperation with the first mounting hole 12 , the second mounting hole 22 and the third mounting hole 32 , so as to ensure the installation reliability of the magnetic shielding plate 100 .

[0062] Specifically, the mounting member may also be a structural member such as a bolt or a rivet.

[0063] In some embodiments, in order to further improve the installation reliability of the magnetic shielding plate 100, the first heat dissipation plate 10 can be provided with a plurality of first mounting holes 12 spaced apart, the silicon steel sheet layer 20 can be provided with a plurality of second mounting holes 22 spaced apart, the second heat dissipation plate 30 can be provided with a plurality of third mounting holes 32 spaced apart, and there can be multiple mounting parts, and then each mounting part is matched with a first fixing hole 11, a second fixing hole 21 and a third fixing hole 31 to be installed on the bracket, so as to perform multi-position installation through multiple mounting parts.

[0064] It should be noted that the distribution of the plurality of mounting members is not specifically limited. Optionally, each corner of the silicon steel sheet layer 20 may be mounted by at least one mounting member.

[0065] The utility model also proposes a hollow reactor assembly, which includes a hollow reactor, a bracket and the magnetic shielding plate 100 as described above. The specific structure of the magnetic shielding plate 100 refers to the above embodiment. Since the hollow reactor assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0066] The magnetic shielding plate 100 and the air-core reactor are both connected to the bracket, and the air-core reactor is defined to have an upper side close to the inner floor of the vehicle, and the magnetic shielding plate 100 is located on the upper side of the air-core reactor. In this way, the magnetic flux density at 30 cm above the inner floor of the vehicle can be effectively suppressed to not exceed 0.8 mT.

[0067] The utility model also proposes an electrical device, which includes the air-core reactor as described above. The specific structure of the air-core reactor refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0068] Specifically, the electrical equipment may be rail transit equipment such as subways and high-speed railways.

[0069] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A magnetic shielding plate, characterized in that: include: a first heat sink; At least one layer of silicon steel sheet, at least one layer of the silicon steel sheet is stacked on the first heat sink; The second heat sink is stacked on a side of the silicon steel sheet away from the first heat sink, so that at least one layer of the silicon steel sheet is sandwiched between the first heat sink and the heat sink.

2. The magnetic shielding plate according to claim 1, wherein: The first heat sink and / or the second heat sink are / is an aluminum alloy plate.

3. The magnetic shielding plate according to claim 1, wherein: The edge of the silicon steel sheet layer is recessed in the edge of the first heat sink plate and the edge of the second heat sink plate.

4. The magnetic shielding plate according to claim 3, wherein: A gap is formed between the edge of the silicon steel sheet layer and one side of the first heat sink close to the second heat sink and one side of the second heat sink close to the first heat sink, and the gap is filled with sealant.

5. The magnetic shielding plate according to any one of claims 1 to 4, characterized in that The surface of the silicon steel sheet layer is provided with an anti-corrosion layer; And / or, the surface of the first heat sink is provided with an anti-corrosion layer; And / or, an anti-corrosion layer is provided on the surface of the second heat dissipation plate.

6. The magnetic shielding plate according to any one of claims 1 to 4, characterized in that The silicon steel sheet layer is provided with multiple layers, and the multiple layers of the silicon steel sheet layer are stacked between the first heat sink and the second heat sink.

7. The magnetic shielding plate according to any one of claims 1 to 4, characterized in that The magnetic shielding plate also includes a fixing member, the first heat dissipation plate is provided with a first fixing hole, the silicon steel sheet layer is provided with a second fixing hole, the second heat dissipation plate is provided with a third fixing hole, and the fixing member is sequentially inserted into the first fixing hole, the second fixing hole and the third fixing hole.

8. The magnetic shielding plate according to any one of claims 1 to 4, characterized in that: The first heat sink is also provided with a first mounting hole, the silicon steel sheet layer is also provided with a second mounting hole, and the second heat sink is also provided with a third mounting hole. The first mounting hole, the second mounting hole and the third mounting hole are used to cooperate with the mounting piece to be installed on the bracket.

9. An air-core reactor assembly, characterized in that: It includes an air-core inductor, a bracket and a magnetic shielding plate as described in any one of claims 1 to 8, wherein the magnetic shielding plate and the air-core inductor are both connected to the bracket, and it is defined that the air-core inductor has an upper side close to the floor plate of the vehicle compartment, and the magnetic shielding plate is located on the upper side of the air-core inductor.

10. An electrical device, characterized in that: Comprising the air-core reactor as claimed in claim 9.

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