Electromagnetic shielding structure, electrical device and air purifier

Abstract

The present invention relates to an electromagnetic shielding structure, an electrical device and an air purifier, wherein the electromagnetic shielding structure comprises a first shielding member, comprising a shielding cavity having a first opening on one side, wherein the shielding cavity is used to receive a receiving portion having the voltage doubling circuit module from the opening; and a second shielding member is located on one side of the first shielding member, wherein the second shielding member is used to fit with a side of the mounting portion away from the control module. The electromagnetic shielding structure, the electrical device and the air purifier provided by the present invention form a non-enclosed shielding cover through the first shielding member, which can enclose the interference signal generated by the voltage doubling circuit module in a limited space, and further increase the shielding isolation area by setting the second shielding member, thereby enhancing the shielding effect, thereby greatly reducing the impact of the voltage doubling circuit module on the system EMC.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification devices, and in particular to an electromagnetic shielding structure, an electrical device and an air purifier. Background Art

[0002] In recent years, air quality issues have attracted more and more attention, and air purification products have also developed greatly in line with market demand.

[0003] Currently, a commonly used method of air purification is to use high voltage of several thousand volts or more than ten kilovolts for dust collection and sterilization. The high voltage generated by the voltage doubler circuit composed of capacitors and diodes is widely used in air purification due to its advantages of low cost and high efficiency.

[0004] However, when the diode in the voltage doubler circuit is periodically turned on and off, the high-frequency current spikes in the reverse recovery of the diode will cause periodic high-frequency interference to the entire circuit, thus affecting the EMC (electromagnetic compatibility) performance of the system. Summary of the invention

[0005] Based on this, it is necessary to provide an electromagnetic shielding structure, electrical device and air purifier that can prevent the voltage doubling circuit from affecting the EMC performance of the system, in order to address the problem that the high voltage generated by the existing voltage doubling circuit for air purification will affect the EMC performance of the system.

[0006] In one aspect of the present invention, an electromagnetic shielding structure is provided for shielding a voltage doubling circuit module on an electrical device body, wherein the electrical device body further comprises a housing and a control module connected to the voltage doubling circuit module, wherein the housing comprises a housing portion for housing the voltage doubling circuit module and a mounting portion for mounting the control module, and wherein the electromagnetic shielding structure comprises:

[0007] A first shielding member, comprising a shielding cavity having a first opening on one side, wherein the shielding cavity is used to receive the receiving portion from the opening;

[0008] The second shielding member is located on one side of the first shielding member, and the second shielding member is used to fit with a side of the mounting portion away from the control module.

[0009] In one embodiment, the first shielding member includes a first hot-dip galvanized metal member, and / or the second shielding member includes a second hot-dip galvanized metal member.

[0010] In one embodiment, the second shielding member includes a shielding plate, and the shielding plate is used to fit with a surface of a side of the mounting portion facing away from the control module.

[0011] In one of the embodiments, the inner contour shape of the shielding cavity matches the outer contour shape of the receiving portion.

[0012] In one embodiment, the electromagnetic shielding structure includes at least two first connecting parts, and the at least two first connecting parts are arranged on opposite sides of the first opening. The electromagnetic shielding structure is connected to the electrical device body through the at least two first connecting parts.

[0013] Another aspect of the present invention provides an electrical device, comprising an electrical device body and the above-mentioned electromagnetic shielding structure;

[0014] The electrical device body comprises a housing, a voltage doubling circuit module and a control module connected to the voltage doubling circuit module. The housing comprises a receiving portion for receiving the voltage doubling circuit module and a mounting portion for mounting the control module.

[0015] In one embodiment, the receiving portion protrudes outward from a side of the mounting portion away from the control module.

[0016] In one embodiment, the receiving portion includes a receiving cavity having a second opening at one side, and the voltage doubler circuit module is received in the receiving cavity through the second opening.

[0017] In one of the embodiments, the electromagnetic shielding structure is detachably mounted on the shell.

[0018] In one embodiment, the electromagnetic shielding structure includes at least two first connecting portions, and the at least two first connecting portions are disposed on opposite sides of the first opening;

[0019] The housing includes at least two third connection parts, and the electrical device also includes at least two second connection parts, each of which is used to connect a corresponding first connection part and a corresponding third connection part.

[0020] In one embodiment, the first connecting member includes a second threaded member, and the first connecting portion and the third connecting portion both include a second threaded hole matching the second threaded member.

[0021] In one embodiment, the voltage doubling circuit module includes a first grounding part, the control module includes a second grounding part, and the electromagnetic shielding structure includes a third grounding part. The first grounding part, the second grounding part and the third grounding part are all connected to the external ground through at least one of the second connecting members.

[0022] Another aspect of the present invention provides an air purifier, comprising the above-mentioned electrical device.

[0023] The above-mentioned electromagnetic shielding structure, electrical device and electrical device form a non-enclosed shielding cover through the first shielding component, which can enclose the interference signal generated by the voltage doubling circuit module in a limited space. By arranging the second shielding component to fit with the side of the mounting part away from the control module, it is possible to fully utilize the space without affecting the performance of the control module, further increase the shielding isolation area, and thus enhance the shielding effect. In this way, the impact of the voltage doubling circuit module on the system EMC can be greatly reduced.

[0024] In addition, since the entire electromagnetic shielding structure is non-enclosed, compared with the traditional enclosed shielding cover that surrounds the entire electrical device body, the manufacturing process can be reduced and the manufacturing cost can be saved. Moreover, since the circuit of the air purifier involves switching power supply and light power devices, there are obvious requirements for temperature rise. The enclosed shielding cover is not conducive to the heat dissipation of components, thereby affecting the performance of the electrical device body. The electromagnetic shielding structure of the present application is a non-enclosed structure with a heat dissipation opening, which is conducive to the heat dissipation of components, thereby reducing the impact on the performance of the electrical device body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of an electrical device body in one embodiment of the present invention;

[0026] Figure 2 Shows Figure 1 A structural schematic diagram of the electrical device body from another perspective shown;

[0027] Figure 3 is a schematic structural diagram of an electromagnetic shielding structure in one embodiment of the present invention;

[0028] Figure 4 Shows Figure 3 A structural schematic diagram of the electromagnetic shielding structure from another perspective;

[0029] Figure 5 The figure is a schematic diagram of a process of installing an electromagnetic shielding structure on an electrical device body in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0038] Figure 1 A schematic diagram showing the structure of an electrical device body in an embodiment of the present invention is shown; Figure 2 Shows Figure 1 A structural schematic diagram of the electrical device body from another perspective shown; Figure 3 is a schematic structural diagram of an electromagnetic shielding structure in one embodiment of the present invention; Figure 4 Shows Figure 3 The schematic diagram of the structure of the electromagnetic shielding structure from another perspective is shown. For the convenience of description, the drawings only show the structure related to the embodiment of the present invention.

[0039] See attached Figure 1 and Figure 2 An embodiment of the present invention provides an electromagnetic shielding structure 100 for shielding a voltage doubling circuit module 211 on an electrical device body 210. The electrical device body 210 further includes a housing 212 and a control module 213 connected to the voltage doubling circuit module 211. The housing 212 includes a receiving portion 2121 for receiving the voltage doubling circuit module 211 and a mounting portion 2122 for mounting the control module 213. Specifically, the shielded electrical device body 210 may be a part of an electrical device of an air purifier, and more specifically, the shielded electrical device body 210 is an electrical box.

[0040] See attached Figure 3 and Figure 4The electromagnetic shielding structure 100 includes a first shielding member 10 and a second shielding member 20. The first shielding member 10 includes a shielding cavity 12 having a first opening 11 on one side. The shielding cavity 12 is used to receive the receiving portion 2121 from the first opening 11. The second shielding member 20 is located on one side of the first shielding member 10. The second shielding member 20 is used to fit with the side of the mounting portion 2122 away from the control module 213. Preferably, the second shielding member 20 is connected to one side of the first shielding member 10. In this way, the first shielding member 10 and the second shielding member 20 can be installed on the electrical device body 210 as a whole, which is convenient for disassembly and assembly. In other embodiments, the first shielding member 10 and the second shielding member 20 can also be separately provided, which is not limited here.

[0041] A non-enclosed shielding cover is formed by the first shielding component 10, and the interference signal generated by the voltage doubling circuit module 211 can be enclosed in a limited space. By arranging the second shielding component 20 to fit with the side of the mounting portion 2122 facing away from the control module 213, the space can be fully utilized without affecting the performance of the control module 213, and the shielding isolation area can be further increased, thereby enhancing the shielding effect. In this way, the impact of the voltage doubling circuit module 211 on the system EMC can be greatly reduced.

[0042] In addition, since the entire electromagnetic shielding structure 100 is non-enclosed, compared with the traditional enclosed shielding cover that surrounds the entire electrical device body 210, the manufacturing process can be reduced and the manufacturing cost can be saved. Moreover, since the circuit of the air purifier involves switching power supply and light power devices, there are obvious requirements for temperature rise. The enclosed shielding cover is not conducive to the heat dissipation of components, thereby affecting the performance of the electrical device body 210. The electromagnetic shielding structure 100 of the present application is a non-enclosed structure with a heat dissipation opening, which is conducive to the heat dissipation of components, thereby reducing the impact on the performance of the electrical device body 210.

[0043] In some specific embodiments, the first shielding member 10 includes a first hot-dip galvanized metal member, in other embodiments, the second shielding member 20 includes a second hot-dip galvanized metal member, and in other embodiments, the first shielding member 10 includes a first hot-dip galvanized metal member, and the second shielding member 20 includes a second hot-dip galvanized metal member. When a hot-dip galvanized metal member is used as a shielding member, the hot-dip galvanized material thereon can be well metallurgically bonded with the metal member, thereby improving the durability of the hot-dip galvanized material. In addition, the hot-dip galvanized material can also improve the toughness of the metal member, thereby preventing external mechanical damage to the housing 212, the voltage multiplier circuit module 211, and the control module 213.

[0044] In some embodiments, the second shielding member 20 includes a shielding plate, which is used to fit with the surface of the mounting portion 2122 on one side away from the control module 213. By providing the shielding plate, the area where the second shielding member 20 fits with the surface of the mounting portion 2122 on one side away from the control module 213 can be increased without increasing the occupied space of the electromagnetic shielding structure 100, thereby increasing the shielding isolation area and further enhancing the shielding effect.

[0045] like Figure 5 As shown, in some embodiments, the inner contour of the shielding cavity 12 matches the outer contour of the receiving portion 2121. In this way, while ensuring the shielding effect, the space occupied by the electromagnetic shielding structure 100 is avoided from being increased.

[0046] Please refer again Figure 3 In some embodiments, the electromagnetic shielding structure 100 includes at least two first connection parts 30, and the at least two first connection parts 30 are arranged on opposite sides of the first opening 11. The electromagnetic shielding structure 100 is connected to the electrical device body 210 through the at least two first connection parts 30. Specifically, the at least two first connection parts 30 are both arranged on the first shielding member 10. By arranging the at least two first connection parts 30 on opposite sides of the first opening 11, the reliability of the connection between the electromagnetic shielding structure 100 and the electrical device body 210 can be improved, thereby ensuring the shielding effect of the electromagnetic shielding structure 100.

[0047] Specifically, the electromagnetic shielding structure 100 includes two first connection portions 30 , and the two first connection portions 30 are disposed at two opposite sides of the first opening 11 along the longitudinal direction thereof.

[0048] Please refer again Figure 5 Based on the same inventive concept, the present invention also provides an electrical device 200 , including an electrical device body 210 and the above-mentioned electromagnetic shielding structure 100 .

[0049] Please refer again Figure 1 and Figure 2 The electrical device body 210 includes a housing 212, a voltage doubling circuit module 211, and a control module 213 connected to the voltage doubling circuit module 211. The housing 212 includes a receiving portion 2121 for receiving the voltage doubling circuit module 211 and a mounting portion 2122 for mounting the control module 213. Specifically, the control module 213 includes a PCB board.

[0050] In some embodiments, the receiving portion 2121 protrudes outward from the side of the mounting portion 2122 away from the control module 213. In this way, the positional relationship between the receiving portion 2121 and the mounting portion 2122 is conducive to the first shielding member 10 of the electromagnetic shielding structure 100 forming a non-enclosed shielding cover to enclose the interference signal generated by the voltage multiplier circuit module 211 in a limited space. Specifically, the direction in which the receiving portion 2121 protrudes outward from the side of the mounting portion 2122 away from the control module 213 is perpendicular to the extension direction of the mounting portion 2122.

[0051] In some embodiments, the receiving portion 2121 includes a receiving cavity with a second opening on one side, and the voltage doubler circuit module 211 is received in the receiving cavity through the second opening. By providing the receiving cavity with the second opening, the installation of the voltage doubler circuit module 211 can be more convenient.

[0052] In some embodiments, the electrical device body 210 further includes epoxy resin filled in the receiving cavity, and the voltage doubling circuit module 211 is encapsulated in the receiving cavity by the epoxy resin. Epoxy resin has excellent adhesion, sealing, heat resistance and insulation properties, so by filling the epoxy resin to encapsulate the voltage doubling circuit module 211 in the receiving cavity, the working stability of the voltage doubling circuit module 211 is improved.

[0053] In some embodiments, the mounting portion 2122 is in a plate shape, so that the fitting area between the second shielding component 20 and the mounting portion 2122 can be increased, thereby improving the shielding effect.

[0054] In some embodiments, the mounting portion 2122 includes a second connection portion 2123, and the control module 213 is mounted on the mounting portion 2122 through the second connection portion 2123. Specifically, the electrical device 200 includes a first connection member, and the first connection member is used to connect the control module 213 and the second connection portion 2123. More specifically, the first connection portion includes a first threaded member, and the control module 213 and the second connection portion 2123 both include a first threaded hole that matches the first threaded member.

[0055] In some embodiments, the electromagnetic shielding structure 100 is detachably mounted on the housing 212. By arranging that the electromagnetic shielding structure 100 is detachably mounted on the housing 212, subsequent replacement or detection can be facilitated.

[0056] Please refer again Figure 1 and Figure 3In some embodiments, the electromagnetic shielding structure 100 includes at least two first connection parts 30, and the at least two first connection parts 30 are arranged on opposite sides of the first opening 11. The shell 212 includes at least two third connection parts 2124. The electrical device 200 also includes at least two second connection members, and each second connection member is used to connect a corresponding first connection part 30 and a corresponding third connection part 2124. Specifically, at least two third connection parts 2124 are arranged on opposite sides of the second opening. In this way, by providing at least two second connection members to connect at least two first connection parts 30 and at least two third connection parts 2124, the connection between the electromagnetic shielding structure 100 and the shell 212 can be reliable, and the shielding effect can be further guaranteed.

[0057] Preferably, the first connecting member includes a second threaded member, and the first connecting portion 30 and the third connecting portion 2124 both include a second threaded hole matching the second threaded member. The method of fixing by the second threaded member and the second threaded hole is simple and convenient for assembly and disassembly.

[0058] In some embodiments, the voltage doubling circuit module 211 includes a first grounding portion, the control module 213 includes a second grounding portion, and the electromagnetic shielding structure 100 includes a third grounding portion, and the first grounding portion, the second grounding portion, and the third grounding portion are all connected to the external earth through at least one second connecting member. In this way, the grounding connection of the voltage doubling circuit module 211, the control module 213, and the electromagnetic shielding structure 100 can be simplified, and the shielding start of the voltage doubling circuit module 211 by the electromagnetic shielding structure 100 is also completed through the grounding connection.

[0059] Based on the same inventive concept, the present invention also provides an air purifier, comprising the above-mentioned electrical device 200.

[0060] The electromagnetic shielding structure 100, the electrical device 200, and the air purifier provided by the embodiments of the present invention have the following beneficial effects:

[0061] A non-enclosed shielding cover is formed by the first shielding component 10, and the interference signal generated by the voltage doubling circuit module 211 can be enclosed in a limited space. By arranging the second shielding component 20 to fit with the side of the mounting portion 2122 facing away from the control module 213, the space can be fully utilized without affecting the performance of the control module 213, and the shielding isolation area can be further increased, thereby enhancing the shielding effect. In this way, the impact of the voltage doubling circuit module 211 on the system EMC can be greatly reduced.

[0062] In addition, since the entire electromagnetic shielding structure 100 is non-enclosed, compared with the traditional enclosed shielding cover that surrounds the entire electrical device body 210, the manufacturing process can be reduced and the manufacturing cost can be saved. Moreover, since the circuit of the air purifier involves switching power supply and light power devices, there are obvious requirements for temperature rise. The enclosed shielding cover is not conducive to the heat dissipation of components, thereby affecting the performance of the electrical device body 210. The electromagnetic shielding structure 100 of the present application is a non-enclosed structure with a heat dissipation opening, which is conducive to the heat dissipation of components, thereby reducing the impact on the performance of the electrical device body 210.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electromagnetic shielding structure (100) for shielding a voltage doubling circuit module (211) on an electrical device body (210), the electrical device body (210) further comprising a housing (212) and a control module (213) connected to the voltage doubling circuit module (211), the housing (212) comprising a receiving portion (2121) for receiving the voltage doubling circuit module (211) and a mounting portion (2122) for mounting the control module (213), the receiving portion (2121) protruding outward from a side of the mounting portion (2122) facing away from the control module (213), characterized in that: The electromagnetic shielding structure (100) comprises: A first shielding component (10) comprises a shielding cavity (12) having a first opening (11) on one side, the shielding cavity (12) being used to receive the receiving portion (2121) through the first opening (11); the inner contour shape of the shielding cavity (12) matches the outer contour shape of the receiving portion (2121); A second shielding member, located on one side of the first shielding member (10), the second shielding member being used to fit with a side of the mounting portion (2122) facing away from the control module (213); At least two first connection parts (30), the at least two first connection parts (30) being arranged on opposite sides of the first opening (11), and the electromagnetic shielding structure (100) being connected to the electrical device body (210) via the at least two first connection parts (30).

2. The electromagnetic shielding structure (100) according to claim 1, characterized in that: The first shielding member (10) comprises a first hot-dip galvanized metal member, and / or the second shielding member comprises a second hot-dip galvanized metal member.

3. The electromagnetic shielding structure (100) according to claim 1, characterized in that: The second shielding component comprises a shielding plate, and the shielding plate is used to fit with a surface of a side of the mounting portion (2122) facing away from the control module (213).

4. An electrical device (200), characterized in that: It comprises an electrical device body (210) and the electromagnetic shielding structure (100) according to any one of claims 1 to 3; The electrical device body (210) comprises a housing (212), a voltage doubling circuit module (211), and a control module (213) connected to the voltage doubling circuit module (211); the housing (212) comprises a receiving portion (2121) for receiving the voltage doubling circuit module (211) and a mounting portion (2122) for mounting the control module (213).

5. The electrical device (200) according to claim 4, characterized in that: The receiving portion (2121) comprises a receiving cavity having a second opening on one side, and the voltage doubler circuit module (211) is received in the receiving cavity through the second opening.

6. The electrical device (200) according to claim 4, characterized in that: The electromagnetic shielding structure (100) is detachably mounted on the housing (212).

7. The electrical device (200) according to claim 4, characterized in that: The electromagnetic shielding structure (100) comprises at least two first connecting portions (30), wherein the at least two first connecting portions (30) are arranged on two opposite sides of the first opening (11); The housing (212) comprises at least two third connection parts (2124), and the electrical device (200) further comprises at least two second connection members, each of the second connection members being used to connect a corresponding first connection part (30) and a corresponding third connection part (2124).

8. The electrical device (200) according to claim 7, characterized in that: The second connecting member comprises a second threaded member, and the first connecting portion (30) and the third connecting portion (2124) both comprise a second threaded hole matching the second threaded member.

9. The electrical device (200) according to claim 7, characterized in that: The voltage doubling circuit module (211) comprises a first grounding portion, the control module (213) comprises a second grounding portion, the electromagnetic shielding structure (100) comprises a third grounding portion, and the first grounding portion, the second grounding portion and the third grounding portion are all connected to an external ground via at least one second connecting member.

10. An air purifier, characterized in that: Comprising the electrical device (200) as claimed in any one of claims 4 to 9.

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