CN114025601A

CN114025601A - Shielding device and electric appliance

Info

Publication number: CN114025601A
Application number: CN202111350211.4A
Authority: CN
Inventors: 唐培捷; 吴洪清; 杨子勤; 席云峰; 黄强
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-02-08
Anticipated expiration: 2041-11-15
Also published as: CN114025601B

Abstract

The application relates to the technical field of electromagnetic shielding, and discloses a shielding device and an electric appliance. Wherein shield assembly includes: the shielding cover comprises a first cover body and a second cover body, wherein the first cover body and the second cover body are assembled to enclose a shielding cavity for accommodating a magnetic device to be shielded; a heat dissipation opening is arranged between the first cover body and the second cover body, so that heat of the magnetic device to be shielded is exhausted from the heat dissipation opening. Compared with the prior art, treat the electromagnetism of shielding magnetic device week side radiation through first cover body and second cover body to the shielding, on the other hand accelerates thermal exhaust efficiency through the heat dissipation opening, avoids the temperature rise problem, improves overall structure electromagnetic shield effect's reliability and stability.

Description

Shielding device and electric appliance

Technical Field

The application relates to the technical field of electromagnetic shielding, in particular to a shielding device and an electric appliance.

Background

With the increasing functions of household appliances, the density of devices in the PCB board is increased. In which the spatial electromagnetic radiation interference generated by the magnetic devices is becoming increasingly severe, degrading the performance of the EMI filter in the high frequency range. In order to reduce the radiation interference emitted by these magnetic devices, it is an effective technique to reduce the coupling by using a shielding layer to avoid the EMI filter component from being affected by the radiation of the magnetic device. When traditional shielding technique is shielding to magnetic device, often adopt the sealed parcel magnetic device of shielding layer, however this kind of adoption shielding mode can aggravate the temperature rise problem of magnetic device self, especially to the magnetic device at some forceful electric power departments, electromagnetic shield effect is relatively poor, and the temperature rise problem influences more seriously, along with the increase of live time, leads to the decline of electrical apparatus overall performance.

Disclosure of Invention

In order to solve the technical problems of serious temperature rise and poor electromagnetic shielding effect of a magnetic device at a strong current position, the application mainly aims to provide a shielding device and an electric appliance which can weaken the temperature rise problem of the magnetic device at the strong current position and have excellent electromagnetic shielding effect.

In order to achieve the purpose of the invention, the following technical scheme is adopted in the application:

according to an aspect of the present application, there is provided a shielding apparatus including:

a first cover body comprising a first shielding plate and a second shielding plate which are oppositely arranged, wherein the first shielding plate is oppositely positioned on the first side surface of the magnetic device to be shielded, the second shielding plate is oppositely positioned on the second side surface of the magnetic device to be shielded, and,

the second cover body comprises a third shielding plate and a fourth shielding plate which are oppositely arranged, the third shielding plate is opposite to the third side surface of the magnetic device to be shielded, and the fourth shielding plate is opposite to the fourth side surface of the magnetic device to be shielded;

the first cover body and the second cover body are assembled to enclose a shielding cavity for accommodating the magnetic device to be shielded; and a heat dissipation opening is formed between the first cover body and the second cover body, so that the heat of the magnetic device to be shielded is discharged from the heat dissipation opening.

According to an embodiment of the present application, the heat dissipation openings are disposed at adjacent positions of the first shielding plate, the second shielding plate, the third shielding plate and the fourth shielding plate.

According to an embodiment of the present application, the first cover includes a first connecting plate, and two ends of the first connecting plate are respectively connected to one end of the first shielding plate and one end of the second shielding plate; the second cover body comprises a second connecting plate, and two ends of the second connecting plate are respectively connected to one end of the third shielding plate and one end of the fourth shielding plate; wherein the content of the first and second substances,

the first connecting plate and the second connecting plate are aligned to a fifth side surface of the magnetic device to be shielded; alternatively, the first and second electrodes may be,

the second connecting plate pair is located on the fifth side face of the magnetic device to be shielded, and one or two first connecting plates are respectively located on the third shielding plate and/or the fourth shielding plate.

According to an embodiment of the present application, the heat dissipation openings are respectively formed at two sides of the second connection plate and adjacent to the first shielding plate or the second shielding plate.

According to an embodiment of the present application, the first connecting plate and the second connecting plate are located opposite to the fifth side of the magnetic device to be shielded, and a spacing cavity is provided between the first connecting plate and the second connecting plate, so that heat can be discharged through the spacing cavity.

According to an embodiment of the application, including a plurality of first cover bodies, a plurality of first cover body sets up along first direction interval, including a plurality of the second cover body, it is a plurality of the second cover body sets up along second direction interval, so that a plurality of louvres are cut apart into to the compartment cavity, the heat in the shielding intracavity is through a plurality of louvre is discharged.

According to an embodiment of the present application, the plurality of heat dissipation holes form a grid structure distributed around the periphery of the magnetic device to be shielded.

According to an embodiment of the application, a side of the first and/or second connection plate facing the compartment is provided with an insulating layer to electrically insulate the first enclosure from the second enclosure.

According to an embodiment of the present application, wherein the first connecting plate with the second connecting plate forms after stacking and piles up the shield plate, it faces to pile up the shield plate the fifth side, the magnetic leakage magnetic flux of fifth side is greater than the first side the second side the third side reaches the magnetic leakage magnetic flux of fourth side.

According to an embodiment of the present application, the first cover and the second cover are both U-shaped or clip-shaped.

According to an embodiment of the present application, the degaussing circuit comprises a degaussing resistor and a degaussing capacitor connected in series, and/or,

the degaussing circuit comprises a degaussing bead circuit.

According to an embodiment of the present application, two ends of the degaussing circuit are respectively connected between the first cover and the second cover, or,

the two ends of the degaussing circuit are respectively connected between the first shielding plate and the second shielding plate, or,

and two ends of the degaussing circuit are respectively connected between the third shielding plate and the fourth shielding plate.

According to an embodiment of the application, including base and pin, wait to shield magnetic device assemble in the base, the first end of pin assemble in first cover body and the second cover body, the second end of pin assemble in the base, first cover body and the second cover body pass through the pin with base ground connection.

According to another aspect of the present application, there is provided an electrical appliance comprising the shielding device.

According to the technical scheme, the shielding device and the electric appliance have the advantages and positive effects that:

carry out the electromagnetic shield through the first cover body and the second cover body to magnetism device to wait to shield magnetism device and wait to shield the electromagnetism of magnetism device in first side, second side, third side and fourth side to week side radiation through first shield plate, second shield plate, third shield plate, fourth shield plate, on the other hand passes through the heat dissipation opening makes wait to shield the heat of magnetism device and pass through the heat dissipation opening is discharged fast, and then reduces the temperature in the shielding chamber, effectively avoids the temperature rise problem of magnetism device position department improves electromagnetic shield effect's reliability and stability.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic overall structural diagram of a first embodiment of a shielding apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a part of an overall structure of a first embodiment of a shielding apparatus according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a first cover in a first embodiment of a shielding apparatus according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a second enclosure in a first embodiment of a shielding apparatus according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a magnetic device of a shielding apparatus according to an embodiment of the present disclosure;

fig. 6 is a schematic overall structural diagram of a second embodiment of a shielding apparatus according to an embodiment of the present application;

fig. 7 is another overall structural diagram of a second embodiment of a shielding apparatus according to an embodiment of the present application;

fig. 8 is a schematic overall structure diagram of a third embodiment of a shielding apparatus according to an embodiment of the present application;

fig. 9 is a schematic diagram of an electrical connection structure of a magnetic circuit in a shielding apparatus according to an embodiment of the present application;

fig. 10 is a schematic diagram of another electrical connection structure of the magnetic circuit in the shielding apparatus according to the embodiment of the present application;

fig. 11 is a schematic diagram of another electrical connection structure of the magnetic circuit in the shielding apparatus according to the embodiment of the present application;

FIG. 12 is a diagram illustrating disturbance power of a middle connection line of an unassembled shielding device of an electrical appliance according to an embodiment of the present disclosure;

fig. 13 is a diagram of disturbance power of a central connection line of an electrical appliance mounting shielding device used in an embodiment of the present application.

Wherein:

1. a first cover body; 101. a first shield plate; 102. a second shielding plate; 103. a first connecting plate;

2. a second cover body; 201. a third shield plate; 202. a fourth shield plate; 203. a second connecting plate;

100. a heat dissipation opening; 110. heat dissipation holes;

200. a shielding cavity; 300. an insulating layer;

3. a base; 4. a pin;

5. a degaussing circuit; 511. an RC circuit; 512. magnetic beads;

6. a magnetic device to be shielded;

501. a first discharge circuit; 502. a second discharge loop;

400. a first direction; 500. a second direction; 600. a compartment is formed.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As the functions of the household appliances are increased, the devices in the PCB are also more and more dense, wherein the spatial electromagnetic radiation interference generated by the magnetic devices is more and more serious, so that the performance of the EMI filter in the high frequency range is deteriorated. In order to reduce the radiation interference emitted by these magnetic devices, it is an effective technique to reduce the coupling by using a shielding layer to avoid the EMI filter component from being affected by the radiation of the magnetic device. When traditional shielding technique is shielding to magnetic device, often adopt shielding layer seal parcel to wait to shield magnetic device, however this kind of adoption shielding mode can aggravate the temperature rise problem of waiting to shield magnetic device self, especially to the magnetic device at some forceful electric power departments, electromagnetic shield effect is relatively poor, and the temperature rise problem influences more seriously, along with the increase of live time, leads to the decline of electrical apparatus wholeness ability. In addition, the traditional shielding technology only shields the switching power supply part in the PCB, but ignores that the magnetic device at a strong current position has very serious electromagnetic coupling effect in a high-frequency state, and the electromagnetic coupling brings a large amount of parasitic parameters, so that the high-frequency radiation of EMI exceeds the standard. In order to solve the technical problems that the temperature rise problem of a to-be-shielded magnetic device at a strong current position in the prior art is serious and the electromagnetic shielding effect is poor, the application mainly aims to provide a shielding device and an electric appliance which can weaken the temperature rise problem of the to-be-shielded magnetic device at the strong current position and have excellent electromagnetic shielding effect.

the first cover body 1 comprises a first shielding plate 101 and a second shielding plate 102 which are oppositely arranged, wherein the first shielding plate 101 is oppositely positioned on a first side surface of a magnetic device to be shielded, the second shielding plate 102 is oppositely positioned on a second side surface of the magnetic device to be shielded, and,

the second cover body 2 comprises a third shielding plate 201 and a fourth shielding plate 202 which are oppositely arranged, the third shielding plate 201 is oppositely positioned on the third side surface of the magnetic device 6 to be shielded, and the fourth shielding plate 202 is oppositely positioned on the fourth side surface of the magnetic device 6 to be shielded;

the first cover body 1 and the second cover body 2 are assembled to enclose a shielding cavity 200 for accommodating the magnetic device 6 to be shielded; a heat dissipation opening 100 is formed between the first cover 1 and the second cover 2, so that heat of the magnetic device 6 to be shielded is exhausted through the heat dissipation opening 100.

Treat through first cover body 1 and the second cover body 2 and shield magnetic device 6 and carry out the electromagnetic shield, carry out the electromagnetic shield through first cover body and the second cover body to magnetic device to treat through first shield plate 101, second shield plate 102, third shield plate 201, fourth shield plate 202 and shield the electromagnetism that magnetic device radiates to week side at first side, second side, third side and fourth side, on the other hand passes through heat dissipation opening 100 makes treat that the heat of shielding magnetic device 6 passes through heat dissipation opening 100 discharges fast, and then reduces the temperature in shielding chamber 200, effectively avoids treat the temperature rise problem of shielding magnetic device 6 position department, improves the reliability and the stability of electromagnetic shield effect.

Referring to fig. 1, as shown in an overall structural schematic diagram of a first embodiment of a shielding apparatus provided in the present embodiment, because most of magnetic devices in a strong-current circuit generate heat violently, a conventional shielding structure cannot meet the heat dissipation requirement of the strong-current circuit, which may cause a failure of a component due to overheating of the magnetic device 6 to be shielded, and may cause an electrical safety problem due to excessive temperature rise, a shielding cavity 200 for accommodating the magnetic device 6 to be shielded is formed by assembling the first cover body and the second cover body; a heat dissipation opening 100 is formed between the first cover 1 and the second cover 2, so that heat of the magnetic device 6 to be shielded is discharged through the heat dissipation opening 100.

Through first shield plate 101, second shield plate 102 third shield plate 201 fourth shield plate 202 centers on treat four different sides of shielding magnetic device 6, improves electromagnetic shield effect, and passes through heat dissipation opening 100 makes the shielding chamber forms non-closed cavity, just makes shielding chamber 200 passes through heat dissipation opening 100 carries out the heat exchange with external environment, is shielding treat shielding magnetic device 6 electromagnetic radiation simultaneously, improves treat the radiating efficiency of shielding magnetic device 6, and the position of heat dissipation opening 100 can set up according to the in-service use condition in the both sides of first cover body 1, or the both sides of second cover body 2 to satisfy the in-service use demand through the heat dissipation opening 100 who reserves.

Referring to fig. 2, a part of the overall structure of a first embodiment of a shielding apparatus provided in the embodiment of the present application is schematically shown, according to an embodiment of the present application, two adjacent portions of the first shielding plate 101, the second shielding plate 102, the third shielding plate 201, and the fourth shielding plate 202 are respectively provided with the heat dissipation opening 100. The first shielding plate 101, the second shielding plate 102, the third shielding plate 201 and the fourth shielding plate 202 shield the area of the leakage magnetic flux, on the one hand, the heat in the shielding cavity 200 and the heat in the external environment are subjected to heat exchange, on the other hand, the heat dissipation opening 100 arranged at the adjacent position between the shielding plates can be used for improving the heat dissipation efficiency of the to-be-shielded magnetic device 6.

As an example, the first cover body 1 and the second cover body 2 may be made of a metal material with good electrical and thermal conductivity, and as an example, may be made of a copper, iron, aluminum, zinc, or silicon steel material, so as to shield the electromagnetic waves radiated from the magnetic device 6 to the outside, and improve the heat exchange efficiency with the external environment through the metal material.

Referring to fig. 3 for a schematic structural diagram of a first cover body in a first embodiment of a shielding apparatus provided by the embodiment of the present application and fig. 4 for a schematic structural diagram of a second cover body in the first embodiment of the shielding apparatus provided by the embodiment of the present application, as an example, the first cover body 1 and the second cover body 2 are in a split structure, the first cover body 1 and the second cover body 2 can be buckled to form a shielding cavity 200 around the circumferential side of the to-be-shielded magnetic device 6, the inner diameter of the shielding cavity 200 is slightly larger than the to-be-shielded magnetic device 6, on one hand, the first shielding plate 101, the second shielding plate 102, the third shielding plate 201 and the fourth shielding plate 202 flexibly set up are used to electromagnetically shield the to-be-shielded magnetic devices 6 with different structures, so as to improve the application range, on the other hand, the position of the heat dissipation opening 100 is conveniently adjusted, the shielding device can be used for uniformly adjusting the electromagnetic shielding effect and the heat dissipation effect of the magnetic device 6 to be shielded, so that the flexibility in use is improved, and the use by a user is facilitated.

As an example, the sizes of the first enclosure 1 and the second enclosure 2 can be adjusted, so that the size of the shielding cavity 200 and the size of the heat dissipation opening 100 can be adjusted, and thus, the size can be changed for various field situations.

Preferably, the first shielding plate 101, the second shielding plate 102, the third shielding plate 201 and the fourth shielding plate 202 reach the installation position of the heat dissipation opening 100, under the optimal implementation condition, each surface of the to-be-shielded magnetic device 6 needs to be attached to the corresponding shielding plate as much as possible, and each shielding plate should cover the cross section of the to-be-shielded magnetic device 6 as much as possible, so as to improve the electromagnetic shielding effect of the magnetic flux leakage around the to-be-shielded magnetic device 6.

Preferably, the first cover body 1 and the second cover body 2 may be made of materials with different magnetic inductivity, so that both low-frequency and high-frequency electromagnetic shielding effects are achieved through the first cover body 1 and the second cover body 2.

Referring to fig. 5, as shown in a schematic structural diagram of a to-be-shielded magnetic device 6 of a shielding apparatus provided in an embodiment of the present application, as an example, the to-be-shielded magnetic device 6 may be a combination of an iron core and a coil, the coil is sleeved on the iron core, when a current passes through the coil, a magnetic field may be formed in a space around the coil, since the magnetic permeability of the iron core is much better than that of air, most of the magnetic flux will pass through the iron core, and this part of the magnetic flux is called main magnetic flux, preferably, the stacked shielding plates may be disposed at two ends of the iron core and close to two end positions of the iron core, so as to shield most of the magnetic flux by the stacked shielding plates.

The leakage flux refers to a portion of the magnetic field outside the magnetic shield device in the magnetic shield device. The leakage flux is magnetic field energy of the magnetic source leaking in the air (space) through a specific magnetic circuit.

Furthermore, optimally, the stacked shielding plates should be respectively formed by overlapping two different materials with high magnetic susceptibility and low magnetic susceptibility, so as to achieve the shielding effect of both low frequency and high frequency.

Preferably, a plurality of first cover bodies 1 and a plurality of second cover bodies 2 can be stacked, and the electromagnetic shielding effect is more remarkable when the number of stacked layers is larger. And on the basis of multi-lamination, shielding materials of different materials can be respectively adopted, so that the shielding frequency range is between the first cover body 1 and the second cover body 2. Referring to fig. 1, which is a schematic overall structure diagram of a first embodiment of a shielding apparatus provided in an embodiment of the present application, and fig. 6 is a schematic overall structure diagram of a second embodiment of the shielding apparatus provided in the embodiment of the present application, according to an embodiment of the present application, wherein the first cover 1 includes a first connecting plate 103, two ends of the first connecting plate 103 are respectively connected to one end of the first shielding plate 101 and one end of the second shielding plate 102; the second cover 2 includes a second connecting plate 203, and two ends of the second connecting plate 203 are respectively connected to one end of the third shielding plate 201 and one end of the fourth shielding plate 202; wherein the content of the first and second substances,

the first connecting plate 103 and the second connecting plate 203 are aligned to a fifth side of the magnetic device 6 to be shielded; that is, the first cover 1 is made to have a door-shaped structure, the second cover 2 is made to have a door-shaped structure, and a double-layer shielding plate structure is formed on the fifth side surface through the first connecting plate 103 and the second connecting plate 203, so as to improve the electromagnetic shielding effect of the fifth side surface.

Alternatively, the first and second electrodes may be,

the pair of second connection plates 203 is located on the fifth side of the magnetic device 6 to be shielded, and one or two first connection plates 103 are located on the third shielding plate 201 and/or the fourth shielding plate 202, respectively.

That is, the second connecting board 203 connects the third shielding plate 201 and the fourth shielding plate 202 to form a U-shaped or gate-shaped structure when the fifth side of the magnetic device 6 to be shielded is butted with the second connecting board 203;

the first connecting plate 103 is connected to the first shielding plate 101 and the second shielding plate 102 to form the second cover 2 having a U-shaped structure, so that the first connecting plate 103 is aligned to the third shielding plate 201, and a double-layer shielding plate is formed on the third side surface to enhance the electromagnetic shielding effect of the magnetic member to be shielded 6 on the third side surface.

Similarly, the first connecting plate 103 is connected to the first shielding plate 101 and the second shielding plate 102 to form a second cover body with a U-shaped structure, so that the first connecting plate 103 is aligned to the fourth shielding plate 202 to form a double-layer shielding plate on the fourth side surface, thereby enhancing the electromagnetic shielding effect of the magnetic member to be shielded 6 on the fourth side surface.

Referring to fig. 6 and 7, in another embodiment, the pair of second connection plates 203 is located on a fifth side of the magnetic device to be shielded, and one or two first connection plates 103 are located on the third shielding plate 201 and/or the fourth shielding plate 202, respectively.

That is, the second connecting board 203 connects the third shielding plate 201 and the fourth shielding plate 202 to form a U-shaped or gate-shaped structure when the fifth side of the magnetic device to be shielded is butted with the second connecting board 203;

two first connecting plates 103 are arranged, and the two ends of the first shielding plate 101 and the two ends of the second shielding plate 102 are connected through the two first connecting plates 103 respectively, that is, the first cover body forms a closed structure in a shape of a square circle through the two first connecting plates 103, so that one of the first connecting plates 103 is aligned to the third shielding plate 201, the other first connecting plate 103 is aligned to the fourth shielding plate 202, and the electromagnetic shielding effect of the third side and the fourth side can be further enhanced simultaneously.

The first connecting board 103 can be aligned with the second connecting board 203, the third shielding board 201, or the fourth shielding board 202 by adjusting the sizes of the first cover and the second cover, and the flexibility of the shielding of the electromagnetic shielding apparatus is improved.

According to an embodiment of the present application, the heat dissipation opening 100 is formed on two sides of the second connecting plate 203 adjacent to the first shielding plate 101 or the second shielding plate 102, respectively.

According to an embodiment of the present application, the first connecting plate 103 and the second connecting plate 203 are located opposite to the fifth side of the magnetic device 6 to be shielded, and a space 600 is provided between the first connecting plate 103 and the second connecting plate 203, so that heat can be discharged through the space 600.

And then through compartment 600, make first connecting plate 103 with second connecting plate 203 interval sets up, make external environment's air can with compartment 600 circulation of air improves to first connecting plate 103 with the heat transfer area of second connecting plate 203, on the other hand, the accessible heat dissipation opening 100 makes the shielding chamber with compartment 600 intercommunication further improves the holistic radiating effect of electromagnetic shield device.

According to an embodiment of the present application, the first cover 1 has a first connecting plate 103, the second cover 2 has a second connecting plate 203, the first connecting plate 103 faces the second connecting plate 203 to form a stacked shield plate, and the stacked shield plate is disposed on the side of the periphery of the magnetic device 6 to be shielded.

Preferably, the first connecting plate 103 and the second connecting plate 203 are stacked to form a stacked shielding plate, the stacked shielding plate faces the fifth side, and the leakage magnetic flux of the fifth side is greater than the leakage magnetic flux of the first side, the second side, the third side and the fourth side.

Referring to fig. 1, preferably, the stacked shielding plates are disposed on the peripheral sides of the to-be-shielded magnetic devices 6, so as to enhance the electromagnetic shielding effect of the corresponding surfaces of the to-be-shielded magnetic devices 6, and preferably, the stacked shielding plates are disposed on the fifth side, so that the shielding effect can be effectively improved, and meanwhile, the manufacturing cost of the overall structure is saved.

First cover body 1 with including the individual layer shield plate in the second cover body 2, it is right through the individual layer shield plate first side the second side the third side reaches the magnetic leakage of fourth side shields, and then improves the holistic shielding effect of shield assembly.

According to an embodiment of the present application, an electrical connector (not shown) is provided between the first connecting plate 103 and the second connecting plate 203 to electrically connect the first cover 1 and the second cover 2.

Illustratively, the first cover 1 and the second cover 2 can be stacked together by the first connecting plate 103 and the second connecting plate 203, the first cover 1 can be provided in plurality, the second cover 2 can be provided in plurality, and by way of example, when one first cover 1 and one second cover 2 are stacked and assembled, the first cover 1 and the second cover 2 can be stacked together by the first connecting plate 103 and the second connecting plate 203, as shown in fig. 1, so that the first connecting plate 103 and the second connecting plate 203 are arranged on the side of the magnetic device 6 to be shielded, which is away from the mounting surface, such as on the top of the magnetic device 6 to be shielded.

As an example, an electrical connector (not shown in the figure) is disposed between the first connecting plate 103 and the second connecting plate 203, and the electrical connector can be tightly connected by welding, screws, tenon-and-mortise structures, so that on one hand, the electrical connector can ensure that the overall shielding device is in a good electrical conduction state, on the other hand, the electrical connector can enhance the mechanical stability of the overall shielding device, thereby avoiding the problem that the first cover 1 and the second cover 2 are dislocated and separated after resonance is generated during the operation of the electrical appliance, and further improving the stability and reliability of electromagnetic shielding.

At this time, because the whole is in a conducting state, only the bottom surface of one of the first cover body 1 or the second cover body 2 needs to be provided with the demagnetizing circuit 5, and the electromagnetic consumption of the magnetic device 6 to be shielded by the first cover body 1 and the second cover body 2 is accelerated by the demagnetizing circuit 5.

As an example, a set of electromagnetic shielding members formed by the first cover body 1 and the second cover body 2 may further include multiple sets of electromagnetic shielding members for assembly, so as to further improve the electromagnetic shielding performance of the magnetic device 6 to be shielded.

According to an embodiment of the present application, a side of the first connecting plate 103 and/or the second connecting plate 203 facing the compartment 600 is provided with an insulating layer 300 to electrically insulate the first cover 1 from the second cover 2.

Illustratively, an insulating layer 300 is provided between the first connecting plate 103 and the second connecting plate 203 to electrically insulate the first enclosure 1 from the second enclosure 2, so that electromagnetic radiation generated by the first enclosure 1 and the second enclosure 2 is reduced by the insulating layer 300.

According to an embodiment of the present application, the insulating layer 300 is an insulating heat dissipation cavity enclosed between the first connection board 103 and the second connection board 203, or;

an insulating layer is provided between the first connecting plate 103 and the second connecting plate 203.

As an example, an insulating coating may be applied on the first connection board 103 opposite to the second connection board 203 to prevent the first cover 1 and the second cover 2 from being electrically conducted through the insulating coating, and at the same time, a heat dissipation gap is reserved between the first connection board 103 and the second connection board 203, so that the insulation between the first cover 1 and the second cover 2 is improved, and the heat concentration of the heat of the magnetic device 6 to be shielded between the first connection board 103 and the second connection board 203 is also improved.

Further, the material of the insulating coating on the surface of the first connecting plate 103 and the material of the insulating coating of the second connecting plate 203 can be controlled to be different in type, so that the first connecting plate 103 and the insulating heat dissipation cavity formed between the second connecting plates 203 are different in magnetic energy of the magnetic flux leakage in the opposite direction, and the surrounding direction of the magnetic flux lines in the insulating heat dissipation cavity and the distribution of the magnetic induction lines are changed, so that the magnetic flux leakage can be limited in the insulating heat dissipation cavity, and the magnetic flux leakage is shielded by the first cover body 1 and the second cover body 2, and the electromagnetic shielding effect is improved.

As an example, referring to fig. 10, as another schematic diagram of an electrical connection structure of a demagnetizing circuit 5 in a shielding apparatus provided in an embodiment of the present application, as an example, two demagnetizing circuits 5 may be provided, so that the first cover body 1 and the second cover body 2 are respectively connected to one demagnetizing circuit 5, and the demagnetizing circuits 5 respectively control shielding effects of the first cover body 1 and the second cover body 2, which is convenient for a user to adjust electromagnetic radiation intensities at different positions of the to-be-shielded magnetic device 6 when in use, improves an overall application range of the shielding apparatus, and effectively avoids an electromagnetic interference problem between products by connecting the demagnetizing circuits 5 in series, thereby increasing shielding effectiveness.

Referring to fig. 1, a schematic overall structure diagram of a first embodiment of a shielding apparatus provided in an embodiment of the present application and fig. 7 is another schematic overall structure diagram of a second embodiment of the shielding apparatus provided in the embodiment of the present application, according to an embodiment of the present application, the shielding apparatus includes a base 3 and a pin 4, and the magnetic device 6 to be shielded is mounted on the base 3.

As an example, the first cover 1 and the second cover 2 may be grounded by reserving pins 4, the first cover 1 or the second cover 2 may be connected to ground pins of the base 3 by welding leads on the surface of the first cover 1 or the second cover 2, or may be connected by a plug-in structure, or in a composite manner, preferably, according to the principle that the resistance of the resistor parallel connection is reduced, the number of ground points should be as large as possible, so as to ensure good grounding between the cover and the base 3.

For example, the first cover 1 and the second cover 2 are made of copper foil, the first cover 1 and the second cover 2 are connected by solder, and are connected to the base 3 by a grounding lead (corresponding to the pin 4) for grounding, and a multi-point grounding method is adopted to reduce grounding impedance, so that the grounding performance is better.

Referring to fig. 4, as shown in a schematic structural diagram of a second cover in a first embodiment of the shielding apparatus provided in the present application, the pin 4 is disposed on the first cover 1 and/or the second cover 2, so that the first cover 1 and/or the second cover 2 is electrically connected to the base 3 through the pin 4.

both ends of the degaussing circuit are respectively connected between the first shielding plate 101 and the second shielding plate 102, or,

two ends of the degaussing circuit are respectively connected between the third shielding plate 201 and the fourth shielding plate 202.

As an example, the demagnetization circuit 5 and the first cover body 1 form a first discharge loop 501 through a pin 4; and/or;

the degaussing circuit 5 and the second cover body 2 form a second discharge loop 502 through a pin 4.

Referring to fig. 9, an electrical connection structure diagram of a magnetic circuit in a shielding apparatus provided in an embodiment of the present application is that, through the first cover 1 or the second cover 2 facing one side of the base 3, the pin 4 is welded, the first cover 1 and/or the second cover 2 is electrically connected to the base 3 through the pin 4, and then the base 3 connects the first cover 1 to the second cover 2, so as to further improve an electromagnetic shielding effect.

Meanwhile, the first cover body 1 and the second cover body 2 are abutted to the base 3, so that the heat of the first cover body 1 and the second cover body 2 can be transferred to the base 3, and the heat dissipation effect of the to-be-shielded magnetic device 6 is improved.

Preferably, the base 3 is made of the same conductive material as the first cover 1 or the second cover 2.

Referring to fig. 11, as another schematic diagram of an electrical connection structure of a demagnetizing circuit in a shielding device provided in an embodiment of the present disclosure, for example, when the first cover 1 and the second cover 2 are electrically conducted, that is, the first connecting plate 103 and the second connecting plate 203 are electrically conducted through the electrical connector, a demagnetizing circuit 5 may be connected in series to the first cover 1 or the second cover 2 to demagnetize the first cover 1 and the second cover 2.

Referring to fig. 10, as another schematic diagram of an electrical connection structure of a demagnetizing circuit in a shielding apparatus provided in an embodiment of the present application, when the first cover body 1 and the second cover body 2 are in a non-conductive state, that is, when an insulating layer is provided between the first connecting plate 103 and the second connecting plate 203, a plurality of pins 4 may be disposed at the bottom of the first cover body 1, and a first discharge circuit 501 is formed by electrically connecting the pins 4 and one demagnetizing circuit 5, and similarly, a plurality of pins 4 are disposed at the bottom of the second cover body 2, and another demagnetizing circuit 5 is formed by serially connecting the pins 4 to form a second discharge circuit 502, that is, the electromagnetic shielding effect of the first cover body 1 and the second cover body 2 on the magnetic device 6 to be shielded may be adjusted by two demagnetizing circuits 5, so as to improve flexibility of use.

The two are separated by an insulating layer, that is, an insulating layer such as an insulating film or a coating (that is, it is required that the two portions are in a non-conductive state). And then the grounding pins are respectively grounded, and the grounding pins 4 can be connected by an RC (resistor-capacitor-resistor-series-demagnetizing capacitor) circuit or by magnetic beads 512. The method can shield the interference of the magnetic device, prevent the floating interference current in a high-frequency state from passing through two grounded shielding shells to form an antenna, and effectively absorb the interference in the antenna through the magnetic beads 512 and the RC circuit 511.

The first cover 1 and the second cover 2 are isolated from each other by an insulating layer on the basis of stacking the first connection plate 103 and the second connection plate 203, and at this time, they are in a non-conductive state. Therefore, two groups of RC circuits 511 or damping circuits can be reserved and designed on the circuit board of the PCB below to be connected, so that two groups of annular shields are formed, and the consumption of absorbing interference can be further accelerated.

Referring to fig. 10 and 11, the degaussing circuit 5 includes a degaussing resistor and a degaussing capacitor connected in series, and/or,

the degaussing circuit comprises a degaussing bead circuit. The electromagnetism of the first cover body 1 and/or the second cover body 2 is electromagnetically shielded through the demagnetizing resistor and the demagnetizing capacitor, or the electromagnetism consumption of the first cover body 1 and/or the second cover body 2 is accelerated through a demagnetizing bead circuit, so that the electromagnetism consumption effect of the shielding device is improved.

As an example, the degaussing circuit 5 is a series RC circuit 511 as the degaussing resistor and degaussing capacitor circuit, and/or a series magnetic bead 512 as the degaussing bead circuit.

As an example, the pin 4 and the lead are connected in series to form an RC circuit 511, the RC circuit 511 is composed of a resistor (degaussing resistor) and a capacitor (degaussing capacitor), as shown in fig. 9, the pin 4 is connected in series to the RC circuit 511 or to the magnetic bead 512 to form a charging and discharging loop or to increase damping, the "mouth" shape structure forms a loop, and the degaussing circuit 5 can accelerate the consumption of the whole shielding apparatus to the absorption interference, thereby achieving the effect of improving the shielding effectiveness.

The demagnetizing circuit 5 can be realized by reserving the installation position of the component on the PCB, and can freely adjust RC parameters and damping size, thereby further improving the use flexibility.

According to an embodiment of the present application, the shielding cover includes a plurality of first covers 1, the plurality of first covers 1 are disposed at intervals along a first direction 400, and include a plurality of second covers 2, the plurality of second covers 2 are disposed at intervals along a second direction 500, so that the heat dissipation opening 100 is divided into a plurality of heat dissipation holes 110, and heat in the shielding cavity 200 is discharged through the plurality of heat dissipation holes 110.

As an example, the first cover 1 and the second cover 2 are both in a U-shaped rod structure, and a plurality of first covers 1 are arranged at intervals along a first direction 400, so that a first heat dissipation opening 100 is formed between two adjacent first covers 1;

the plurality of second cover bodies 2 are arranged at intervals along a second direction 500, so that a second heat dissipation opening 100 is formed between two adjacent second cover bodies 2, when an included angle of 0-180 degrees is formed between the first direction 400 and the second direction 500, the first heat dissipation opening 100 is divided into a plurality of heat dissipation holes 110 by the plurality of second cover bodies 2 at the position of a stacked shielding plate, the second heat dissipation opening 100 is divided into a plurality of heat dissipation holes 110 by the plurality of first cover bodies 1, and then the number of the heat dissipation holes 110 is increased while the electromagnetic shielding effect is improved by stacking the shielding plate, so that the problem of temperature rise of the to-be-shielded magnetic device 6 is further avoided.

According to an embodiment of the present application, the plurality of heat dissipation holes 110 form a grid structure distributed around the periphery of the magnetic device 6 to be shielded.

Referring to fig. 8, as shown in an overall structural schematic diagram of a third embodiment of the shielding device provided in the embodiment of the present application, a plurality of the first cover bodies 1 are arranged at intervals along a first direction 400, and a plurality of the second cover bodies 2 are arranged at intervals along a second direction 500, so that the shielding device is formed by arranging rail structures, and a shielding structure of a cage structure designed based on a faraday cage effect is formed. Wherein the railings with different directions required by the top surface are tightly connected together by welding and other modes, and every two railings of the whole cage-shaped structure are required to be mutually and electrically conducted.

The cage structure proposed by this patent is not specifically defined, but requires that the shielding cavity 200 formed inside said cage structure must be greater than or equal to the volume of the magnetic device 6 to be shielded which it is desired to shield.

By way of example, the cage structure may be provided as a square structure, and the cage structure may still be a curved surface, a polyhedron, or other structure.

According to an embodiment of the present application, the first cover 1 and the second cover 2 are both U-shaped or clip-shaped.

As an example, referring to fig. 1 to 9, the first cover 1 and the second cover 2 may be provided as a first cover or a second cover having a "door" shaped structure including three shielding plates.

As another example, a plate-like structure in which one of the shield plates has an arc-shaped face may be provided. It should be noted that the connection manner of the two shield plates connected in pairs is not fixed to a right angle (the right angle is only shown as an example), and the two shield plates may also have deformation such as chamfer and upper arc.

Or;

referring to fig. 6, an overall structural schematic diagram of a second embodiment of the shielding apparatus provided in the embodiment of the present application and fig. 7 is another overall structural schematic diagram of the second embodiment of the shielding apparatus provided in the embodiment of the present application, so that the first cover body 1 and/or the second cover body 2 is a closed polygonal structure including at least four shielding plates, so that the first cover body includes at least two openings, and the sleeve is disposed around the periphery of the to-be-shielded magnetic device 6 to improve the electromagnetic shielding effect of the shielding cavity 200 on the to-be-shielded magnetic device 6 at different positions and adjust the position of the heat dissipation opening 100.

It should be understood that the temperature rise is the temperature of each component in the electronic and electrical equipment above the environment, and the magnetic beads 512 are the magnetic beads 512 which are specially used for suppressing high-frequency noise and spike interference on a signal line and a power line and have the capacity of absorbing electrostatic pulses. The magnetic beads 512 are used for absorbing ultrahigh frequency signals, like some RF circuits, PLL, oscillating circuits and circuits containing ultrahigh frequency memories (DDR SDRAM, RAMBUS and the like), the magnetic beads 512 are required to be added to a power supply input part, and the inductor is an energy storage element and is used for LC oscillating circuits, medium and low frequency demagnetizing circuits and the like, and the application frequency range of the inductor rarely exceeds 50 MHZ.

The magnetic beads 512 have very high resistivity and permeability, equivalent to a series connection of a resistor and an inductor, but both the resistance and the inductance vary with frequency.

As an example:

in an air conditioner with complex functions, reference is made to fig. 12, which is a graph of disturbance power of a middle connecting wire of an electrical appliance which is not provided with a shielding device according to an embodiment of the present application, at this time, a magnetic device 6 to be shielded in the air conditioner is not provided with a shielding device, that is, a PFC without a shielding device is adopted, the result of inductance testing of the disturbance power of the connecting wire is shown in fig. 12, a section of disturbance peak appears at a high frequency of 50MHZ-60MHZ, which results in a test failure, and a spectrum analyzer is used for detecting that the disturbance source comes from the inductance of the PFC.

If the magnetic device 6 to be shielded in the air conditioner is replaced by the magnetic device 6 to be shielded provided with the shielding device, namely, the PFC provided with the shielding device is adopted, the inductance test result is shown in a disturbance power diagram of a middle connecting wire of the electrical appliance shielding device for the embodiment of the application by referring to FIG. 13, the peak is obviously reduced in the range of high frequency 50MHZ-60MHZ, the margin is sufficient, namely, the shielding device can effectively isolate the external electromagnetic radiation interference generated by the magnetic device 6 to be shielded, and the EMI performance of the whole machine is better.

In fig. 12 and 13, the abscissa indicates frequency, and the unit is: MHZ; the ordinate is the interference magnitude in dB.

The upper layer curve is a test peak value change curve, the upper layer broken line is a peak value standard limit value, and when the peak value change curve exceeds the peak value standard limit value, the test result is unqualified;

the lower layer curve is a tested mean value change curve, the lower layer straight line represents a mean value standard limit value, and when the mean value change curve exceeds the mean value standard limit value, the test result is unqualified.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shielding device, comprising:

a first shield (1) comprising a first shield plate (101) and a second shield plate (102) arranged opposite to each other, the first shield plate (101) being positioned on a first side of the magnetic device (6) to be shielded, the second shield plate (102) being positioned on a second side of the magnetic device (6) to be shielded, and,

the second cover body (2) comprises a third shielding plate (201) and a fourth shielding plate (202) which are oppositely arranged, the third shielding plate (201) is opposite to the third side surface of the magnetic device (6) to be shielded, and the fourth shielding plate (202) is opposite to the fourth side surface of the magnetic device (6) to be shielded;

the first cover body (1) and the second cover body (2) are assembled to form a shielding cavity (200) for accommodating the magnetic device (6) to be shielded; a heat dissipation opening (100) is formed between the first cover body (1) and the second cover body (2), so that heat of the magnetic device (6) to be shielded is exhausted from the heat dissipation opening (100).

2. The shielding device according to claim 1, characterized in that the heat dissipation openings (100) are provided at two adjacent places of the first shielding plate (101), the second shielding plate (102), the third shielding plate (201) and the fourth shielding plate (202).

3. The shielding device according to claim 1, wherein said first housing (1) comprises a first connecting plate (103), two ends of said first connecting plate (103) are respectively connected to one end of said first shielding plate (101) and one end of said second shielding plate (102); the second cover body (2) comprises a second connecting plate (203), and two ends of the second connecting plate (203) are respectively connected to one end of the third shielding plate (201) and one end of the fourth shielding plate (202); wherein the content of the first and second substances,

the first connecting plate (103) and the second connecting plate (203) are aligned to be located on a fifth side face of the magnetic device (6) to be shielded; alternatively, the first and second electrodes may be,

the second connection board (203) is positioned on the fifth side of the magnetic device (6) to be shielded, and one or two first connection boards (103) are positioned on the third shielding board (201) and/or the fourth shielding board (202), respectively.

4. A shielding arrangement according to claim 3, characterized in that said heat dissipation opening (100) is formed adjacent to said first shielding plate (101) or said second shielding plate (102) on both sides of said second connection plate (203), respectively.

5. A shielding device according to claim 3, characterized in that said first connection plate (103) and said second connection plate (203) are located opposite each other on a fifth side of the magnetic component (6) to be shielded, said first connection plate (103) and said second connection plate (203) having a compartment (600) therebetween for the heat to escape through said compartment (600).

6. The shielding device according to claim 5, comprising a plurality of first covers (1), a plurality of first covers (1) spaced apart along a first direction (400), and a plurality of second covers (2), wherein a plurality of second covers (2) spaced apart along a second direction, so that the compartment (600) is divided into a plurality of heat dissipation holes (110), and heat in the shielding cavity (200) is dissipated through the plurality of heat dissipation holes (110).

7. The shielding device according to claim 6, characterized in that a plurality of said heat dissipation holes (110) are arranged in a grid structure around said magnetic device (6) to be shielded.

8. A shielding device according to claim 5, characterized in that the side of the first connection plate (103) and/or the second connection plate (203) facing the compartment (600) is provided with an insulating layer (300) to electrically insulate the first shield (1) from the second shield (2).

9. A shielding device according to claim 3, wherein said first connecting plate (103) and said second connecting plate (203) are stacked to form a stacked shielding plate, said stacked shielding plate faces said fifth side, and the leakage magnetic flux of said fifth side is greater than the leakage magnetic flux of said first side, said second side, said third side and said fourth side.

10. A shielding device according to claim 1, characterized in that said first shield (1) and said second shield (2) are both of a U-shaped configuration or a clip-shaped configuration.

11. A shielding arrangement according to claim 1, comprising a degaussing circuit (5), wherein the degaussing circuit (5) comprises a degaussing resistor and a degaussing capacitor connected in series, and/or,

the degaussing circuit (5) comprises a degaussing bead (512) circuit.

12. The shielding device of claim 11,

the two ends of the degaussing circuit (5) are respectively connected between the first cover body (1) and the second cover body (2), or,

two ends of the degaussing circuit (5) are respectively connected between the first shielding plate (101) and the second shielding plate (102), or,

and two ends of the degaussing circuit (5) are respectively connected between the third shielding plate (201) and the fourth shielding plate (202).

13. The shielding device according to any one of claims 1 to 12, comprising a base (3) and a pin (4), wherein the magnetic device (6) to be shielded is mounted on the base (3), a first end of the pin (4) is mounted on the first cover (1) and the second cover (2), a second end of the pin (4) is mounted on the base (3), and the first cover (1) and the second cover (2) are grounded to the base (3) via the pin (4).

14. An electrical appliance comprising a shielding device according to any one of claims 1 to 12.