Electromagnetic shielding assembly for a housing of an electronic device and an inverter

Abstract

The utility model relates to an electromagnetic shielding assembly for a housing of an electronic device, the housing (1) comprising a closed bottom end (11), an open top end (12), a circumferential flange (121) at the top end and at least a first structural part (13) extending beyond the upper surface (120) of the circumferential flange; and the electromagnetic shielding assembly comprising: a metal shield (2) for mounting to the top end of the housing, the metal shield having a shield body (20) and a first section (21) and a second section (22) extending along the outer periphery of the shield body, wherein the metal shield is configured such that the first section (21) can cooperate with the upper surface of the circumferential flange and the second section (22) can cooperate with an upper side (130) of the first structural part; and a helical spring (3) made of metal, the helical spring being embedded within at least the first structural part (122) in its axial direction and partially protruding beyond the upper side (130) of the first structural part in its radial direction; wherein the metal shield is configured such that, when it is mounted to the top end, the second section of the metal shield contacts and radially presses the helical spring (3).

Description

TECHNICAL FIELD

[0001] The utility model relates to electromagnetic shielding technical field especially relates to a kind of electromagnetic shielding assembly for electronic equipment shell. BACKGROUND

[0002] When metal shielding cover cooperates with the shell (frame) of electronic equipment, when irregular surface or different plane is encountered in the shell shielding position, metal shielding cover cannot realize the structure shielding of different height frequently changed, and due to the characteristics of metal parts, it cannot realize the complete shielding at fault structure (need to have broken groove or relief groove), and the structure is complex, and the cost is high.

[0003] In addition, metal shielding cover is generally fixed on shell by screw, due to its complex structure, uneven stress phenomenon often occurs, there is very strong stress inside, and positioning failure or part misplacement problem can occur seriously. INVENTION CONTENTS

[0004] In order to overcome the above problems, a new type of electromagnetic shielding assembly is needed, which is suitable for the shell of electronic equipment with ladder structure or complex internal structure, and is beneficial to reduce the size of the whole product.

[0005] The utility model provides a kind of electromagnetic shielding assembly for electronic equipment's shell, the shell includes closed bottom end, open top end, at least first structure part in the circumferential flange and the upper surface of the circumferential flange extending beyond the top end;And electromagnetic shielding assembly includes: for installing to the top end of the shell metal shielding cover, the metal shielding cover has cover body and the first section and second section extending along the outer periphery of the cover body, wherein the metal shielding cover is configured so that the first section can be cooperated with the upper surface of the circumferential flange, second section can be cooperated with the upper side of first structure part;And by metal made spiral spring, the spiral spring is embedded in at least the first structure part along its axial direction and partially protrudes beyond the upper side of the first structure part along its radial direction;Wherein the metal shielding cover is configured when it is installed to the top end, the second section of the metal shielding cover contacts and radially extrudes the spiral spring.

[0006] In the above shell structure, since the first structure part is higher than the top surface of the shell, i.e. the upper surface of the circumferential flange, when the metal shielding cover is installed to the shell, different matching surfaces will appear between the metal shielding cover and the shell, by using the electromagnetic shielding assembly according to the utility model, i.e. by setting shielding spiral spring on the side of at least first structure part, and by extruding the spiral spring with the metal shielding cover, the problem of non-closed shielding area when shielding in sections can be solved;And the problem of positioning failure or displacement due to uneven stress and stress deformation of metal shielding cover can also be solved.

[0007] According to one preferred aspect of the present application, the first structural portion extends from the bottom end towards the top end and the upper side is an inner side facing the interior of the housing; and the first portion is a planar portion, the second portion comprises a base and a bent portion perpendicular to the base, wherein the base lies in the same plane as the first portion; when the metal shield is mounted to the top end, the outer side of the bent portion of the second portion contacts and radially presses the helical spring.

[0008] In one aspect, the housing is a metal casting, such as an aluminum casting; during the casting of the housing, the helical spring is embedded in at least the first structural portion by means of an insert or a soluble salt core.

[0009] It should be understood that the helical spring can also be embedded in the housing in other ways. In one alternative, a dovetail groove can be formed in the upper side of at least the first structural portion, the helical spring being mounted in the dovetail groove and partially radially protruding beyond the mouth of the dovetail groove.

[0010] In one preferred aspect, in order to achieve better shielding, the helical spring can be a diagonal spring made of a copper alloy material. By means of the axial compression force of the diagonal spring, tight contact between the contact parts to be contacted is ensured; also due to the axial compression, the spring coil spacing is greatly compressed, thereby achieving high density, multi-contact contact, and at the same time, due to the continuity of the spring, an uninterrupted shielding space is formed in the compression space, ensuring the shielding effect.

[0011] In one aspect of the present application, the metal shield can be a sheet metal part made of a steel sheet by means of sheet metal processing. It should be understood that the shield can also be made of other suitable materials according to specific requirements.

[0012] In one aspect of the present application, the housing further comprises a second structural portion extending beyond the upper surface of the circumferential flange, the helical spring further extending in its axial direction and being embedded in the second structural portion and partially protruding beyond the upper side of the second structural portion in its radial direction; when the metal shield is mounted to the top end, the outer side of the bent portion of the second portion contacts and radially presses the portion of the helical spring located in the second structural portion. Preferably, the helical spring is arranged to lie in the same plane.

[0013] It should be understood that the combination of the metal shielding cover and the metal coil spring shields not only applies to the housings of the first structure part and the second structure part described above, but also applies to other cases where the mating surface of any metal shielding cover and housing has an irregular shape or a different height, as long as the side, especially the outer side, of the metal shielding cover is in contact with and presses the coil spring arranged in the side, especially the inner side, of the housing to solve the problem of non-closed shielding area when shielding in sections, which are all included in the scope of the present application.

[0014] The utility model also provides a kind of inverter, and inverter includes above-mentioned electromagnetic shielding assembly.It should be understood that this electromagnetic shielding assembly is applicable to the housing of any electronic equipment needing electromagnetic shielding, especially in the field of electronic products and automobile field, which are all included in the scope of the present application.

[0015] Due to the adoption of the above technical solutions, the utility model can produce at least one of the following beneficial technical effects:

[0016] The above-mentioned electromagnetic shielding assembly is very suitable for the case where the surface is in stepped structure or the internal structure is complex;At the same time, since the mating surface of this structure is the side, it does not occupy the sealing surface space of the mating end surface of the housing and the metal shielding cover, which is beneficial to reduce the size of the whole product.

[0017] Good shielding, since the coil spring embedded in the housing can play a multi-contact role, and the spring structure is stressed on the axial surface, the overall stress is uniform, which can realize better conductivity in shielding application.

[0018] Simple operation, without additional welding operation or adding special shielding parts, the matching parts can completely realize the fixing and shielding function by using the pressing force between parts;And

[0019] Good versatility, the coil spring can be designed with different wire diameters, coil numbers, selected different inclined spring heights, spring forces, etc. BRIEF DESCRIPTION OF DRAWINGS

[0020] Further features and advantages of the utility model will become more apparent from the following detailed description, with reference to the attached drawings:

[0021] Figure 1 A schematic view showing that the electromagnetic shielding assembly according to one embodiment of the utility model is installed to the housing of an electronic device is shown;

[0022] Figure 2 A perspective view showing one embodiment of the housing according to the utility model is shown;

[0023] Figure 3 A schematic view showing that the electromagnetic shielding assembly according to one embodiment of the utility model is installed to the housing of an electronic device is shown; Figure 2Another perspective view of the housing is shown.

[0024] Figure 4 A perspective view of one embodiment of a metal shield according to the present application is shown.

[0025] Figure 5 An enlarged view of the metal shield is shown. Figure 4 A top view of the metal shield is shown.

[0026] Figure 6 An enlarged view of the shielded coil spring embedded in the housing according to the present application is shown.

[0027] Figure 7 An enlarged view of the coil spring embedded in the housing through the dovetail slot is shown.

[0028] Figure 8 A cross-sectional view of the coil spring in the dovetail slot being compressed by the metal shield is shown; and

[0029] Figure 9 An axial view of the coil spring being compressed by the metal shield is shown. DETAILED DESCRIPTION

[0030] A housing electromagnetic shielding assembly for electronic equipment according to the present application will now be described with reference to the drawings and by way of example. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known process operations have not been described in detail in order not to unnecessarily obscure the present application. Further, it will be understood that the present application is not limited to the particular embodiments described herein but can be practiced with any alternative combinations of the features and elements described, whether related to different embodiments or not.

[0031] In electronic equipment, when electromagnetic shielding of electronic components in a housing is required, a metal shield is installed on the housing (which can also be referred to as a frame) to achieve the shielding function of the electronic components in the housing. However, when the mating surface of the housing and the shield has an irregular shape or the mating surface is uneven, the conventional shield will have a problem of not being closed in the shielding area, and the shield will also have a problem of being deformed by force, thereby failing to be positioned or being displaced.

[0032] Figure 1 An embodiment of the electromagnetic shielding assembly according to the present application installed on a housing 1, specifically the top end of the housing, is shown.

[0033] Referring to Figure 2 and Figure 3Figure 1 shows one embodiment of a housing 1 of an electronic device. As can be seen from the figure, the housing 1 comprises a closed bottom end 11, an open top end 12, a circumferential flange 121 at the top end 12, and a first structure 13 and a second structure 14 extending beyond the upper surface 120 of the circumferential flange 121. The first structure 13 and the second structure 14 both extend from the bottom end 11 towards the top end 12, and the upper surface 120 forms a stepped structure with the first structure 13 and the second structure 14. In the inner side of the first structure 13 and the second structure 14 facing the inside of the housing 1, especially at the plane where the upper surface 120 of the circumferential flange 121 is located, a shielding helical spring 3 is embedded, which is made of metal.

[0034] In this embodiment, the helical spring 3 is embedded in the first structure 13 along its axial direction and extends in its axial direction to be embedded in the second structure 14, and partially protrudes in its radial direction beyond the upper side 130 of the first structure 13 and the upper side 140 of the second structure 14. The helical spring 3 is arranged in the same plane. It should be understood that the above configuration of the helical spring is only exemplary, and the helical spring can extend in other parts of the housing other than the first structure and the second structure.

[0035] In one embodiment, the electromagnetic shielding assembly comprises a metal shielding cover 2 for mounting to the top end 12 of the housing 1 and a helical spring 3. The metal shielding cover can be a sheet metal part made of a steel sheet by a sheet metal process, for example. Referring to Figure 4 and Figure 5 The metal shielding cover 2 has a cover body 20 and a first section (circumferential section) 21 and a second section (circumferential section) 22 extending along the outer periphery of the cover body. The metal shielding cover 2 is designed in shape to fit the shape of the top end 12 of the housing 1, i.e. the first section 21 is configured as a planar section which at least partially cooperates with the upper surface 120 of the circumferential flange 121 of the housing 1, and the second section 22 is configured to cooperate with the upper side 130 of the first structure 13 and the upper side 140 of the second structure 14. In one example, the second section 22 is a bent section comprising a base 221 and a bent portion 222 perpendicular to the base, wherein the base 221 is in the same plane as the first section 21. When the metal shielding cover 2 is mounted to the top end of the housing 2, the second section 22 of the metal shielding cover 2, especially the outer surface of the bent portion 222, contacts and radially presses the helical spring 3. The first section 21 can be fixedly connected to the circumferential flange 12 by a threaded fastener. While the second section presses the helical spring 3, it is subjected to an opposite pressing force from the helical spring, which can ensure good mounting of the metal shielding cover.

[0036] It should be understood that this is only one example of the housing. The housing can also have only the first structure 13, or a third structure different from the first structure 13 and the second structure 14. That is, any surface forming a stepped structure or an internal structure is complex, which is applicable to the electromagnetic shielding assembly according to the present application.

[0037] In one embodiment, the housing 1 is preferably a metal casting, for example an aluminum casting, in the casting process of the housing, the helical spring 3 can be embedded in the housing 1 by an insert or a soluble salt core, especially the first structure 13 and the second structure 13 of the housing 1 (see Figure 6 ). For example, before casting, the shielding spring can be wrapped with a water-soluble salt core, placed in the mold, and then the liquid aluminum alloy is injected into the mold, and then the solidified casting is taken out from the mold together with the salt core, and then the salt core is removed in the next step, the advantage of the salt core relative to other core technology is water-soluble, which simplifies the removal of the salt core, and finally the housing with the embedded helical spring is obtained.

[0038] Alternatively, dovetail grooves can also be provided on the inner side of the cast housing, especially on the upper side 130 of the first structure 13 and the upper side 140 of the second structure 14, and on the upper side of the housing 1 between the first structure 13 and the second structure 14 The dovetail groove 131 is installed in the dovetail groove 131 and partially protrudes radially beyond the groove opening 132 of the dovetail groove (see Figure 7 ). Figure 8 The groove for installing the helical spring 3 is designed as a dovetail groove, which can facilitate the installation and contact of the spring after compression.

[0039] It should be understood that the housing 1 is not limited to a casting. In the case of a non-cast housing, the helical spring can be, for example, welded to the inner side of the housing, which is also covered by the scope of the present application.

[0040] According to one preferred embodiment of the present application, the helical spring 3 is preferably a inclined coil spring made of copper alloy material. In this context, "inclined coil spring" is a circular spring with winding, and the winding is oval and inclined. When compressed, each winding will deform independently, and regardless of which part of the winding deforms, the entire spring will react, thereby achieving uniform loading of each contact point.

[0041] In the present application, see Figure 9By using the oblique coil spring, the bending part 222 of the second section 22 of the metal shielding cover 2 exerts a radial compression force on the helical spring 3 along the axial direction of the helical spring 3, so that the helical spring is in close contact with the housing 1 and the metal shielding cover 2. Since the helical spring is radially compressed, the space between the coils of the helical spring is greatly compressed, thereby realizing high-density and multi-point contact, and due to the continuity of the spring, an uninterrupted shielding space is formed in the compression space, thereby ensuring the shielding effect. Moreover, the spring material, diameter, spring force, number of coils, etc. can be freely selected according to the project requirements, and the transverse compression force on the shielding cover can be accurately adjusted, thereby ensuring good installation of the shielding cover.

[0042] The electromagnetic shielding assembly according to the present application is suitable for various electronic devices requiring electromagnetic shielding, for example, can be applied to an inverter, and can shield the electronic components in the inverter.

[0043] It should be understood that the structure of the housing 1 and the metal shielding cover shown is only an example, and does not constitute a limitation on the present application, and in actual operation, the shape and size of each component can be determined according to the actual situation.

[0044] Although the present application has been disclosed with reference to the preferred embodiments, the present application is not limited thereto. Any combinations, changes and modifications made by those skilled in the art without departing from the spirit and scope of the present application shall be included in the protection scope of the present application, therefore the protection scope of the present application shall be subject to the scope defined in the claims.

Claims

1. An electromagnetic shielding assembly for a housing of an electronic device, characterized in that, the housing (1) comprises a closed bottom end (11), an open top end (12), a circumferential flange (121) at the top end and at least a first structural portion (13) extending beyond an upper surface (120) of the circumferential flange; and the electromagnetic shielding assembly comprises: a metal shield (2) for mounting to the top end (12) of the housing, the metal shield having a shield body (20) and a first section (21) and a second section (22) extending along an outer periphery of the shield body, wherein the metal shield is configured such that the first section (21) is engageable with the upper surface of the circumferential flange and the second section (22) is engageable with an upper side (130) of the first structural portion; and a helical spring (3) made of metal, the helical spring being embedded in at least the first structural portion in its axial direction and partially protruding beyond the upper side (130) of the first structural portion in its radial direction; wherein the metal shield is configured such that, when it is mounted to the top end, the second section of the metal shield contacts and radially presses the helical spring (3).

2. The electromagnetic shielding assembly according to claim 1, characterized in that, the first structural portion (13) extends from the bottom end (11) towards the top end (12) and the upper side (130) is an inner side facing the interior of the housing (1); and the first section (21) is a planar section and the second section (22) comprises a base and a bend perpendicular to the base, wherein the base lies in the same plane as the first section; an outer side of the bend of the second section contacts and radially presses the helical spring (3) when the metal shield (2) is mounted to the top end.

3. The electromagnetic shielding assembly of claim 2, wherein, the housing (1) is a metal casting, the helical spring is embedded in at least the first structural portion (13) by a chaplet or a soluble salt core during the casting process of the housing.

4. The electromagnetic shielding assembly of claim 2, wherein, a dovetail groove (131) is provided in the upper side of at least the first structural portion (13), the helical spring is mounted in the dovetail groove and partially radially protrudes beyond a slot opening (132) of the dovetail groove.

5. The electromagnetic shielding assembly of claim 3, wherein, the housing (1) is an aluminum casting, the helical spring (3) is a inclined coil spring made of copper alloy material.

6. The electromagnetic shielding assembly of any one of claims 1 to 5, wherein, the metal shield (2) is a sheet metal part made of a steel sheet by sheet metal process.

7. The electromagnetic shielding assembly according to claim 2, characterized in that, the housing further comprises a second structural portion (14) extending beyond the upper surface (120) of the circumferential flange, the helical spring further extends in its axial direction and is embedded in the second structural portion (14) and partially protrudes beyond an upper side (140) of the second structural portion in its radial direction; an outer side of the bend of the second section contacts and radially presses the portion of the helical spring (3) within the second structural portion (14) when the metal shield (2) is mounted to the top end.

8. The electromagnetic shielding assembly of claim 7, wherein, The coil spring (3) is arranged to lie in the same plane.

9. An inverter, characterized by comprising: The inverter comprises an electromagnetic shielding assembly according to any one of claims 1 to 7.

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