CN210274686U

CN210274686U - Circuit board and household appliance

Info

Publication number: CN210274686U
Application number: CN201921069728.4U
Authority: CN
Inventors: 徐林江
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-04-07
Anticipated expiration: 2029-07-10

Abstract

The utility model provides a circuit board and domestic appliance, this circuit board include base plate (10) and set up a plurality of electronic component (20) on base plate (10), a plurality of electronic component (20) are connected through being located the lead wire electricity on base plate (10), the periphery of at least one electronic component (20) is provided with protection casing (30) of being connected with base plate (10), protection casing (30) and lead wire are insulating each other and are located two relative surfaces of base plate (10) respectively; the protective cover (30) comprises a shell and an opening (31) located on the surface of the shell, the edge (311) of the opening (31) is connected with the substrate (10), and the substrate (10) and the shell jointly enclose an accommodating cavity (32) for arranging the electronic element (20). The utility model discloses the electronic component that easy short circuit was on fire on can effectively keeping apart the circuit board prevents to take place the conflagration, guarantees stability and security that circuit board and domestic appliance used.

Description

Circuit board and household appliance

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a circuit board and household appliances.

Background

The circuit board is a common electronic component in household appliances, and the circuit board is used as a carrier of electronic components and plays an important role in fixing a circuit and optimizing the layout of the appliances. The stability and safety of the circuit board structure directly affect the use performance of the household appliance.

The circuit board comprises Printed Circuit Board (PCB) and the components and parts of setting on the PCB board, and the components and parts welds on the PCB board through its pin, arranges the pin connection through the copper foil between the solder joint and forms the circuit for the circuit board possesses corresponding automatically controlled performance. Based on the fact that the number of components arranged on the existing circuit board is large, the components are arranged densely, and when the circuit board is used, a part of the components are prone to failure, even short circuit and fire are caused, and normal use of the rest of the components on the circuit board is affected. At present, the method for solving the problem that parts of components are prone to failure is to adjust the arrangement positions of the components on a circuit board and the wiring paths of leads, avoid the components prone to failure and the surrounding wirings from being arranged too densely, and avoid the influence on the use of normal components after the components with failure are on fire.

However, the current circuit board has limited arrangement space, the difficulty in adjusting the arrangement position of the components and the wiring path of the lead is high, the effect of isolating the easily-broken components and the normal components is poor, and the use stability of the circuit board and the household appliance is affected.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one problem mentioned in the background art, the utility model provides a circuit board and domestic appliance can effectively keep apart the electronic component that easy short circuit was on fire on the circuit board, prevents to take place the conflagration, guarantees stability and security that circuit board and domestic appliance used.

In order to achieve the above object, in a first aspect, the present invention provides a circuit board, including a substrate and a plurality of electronic components disposed on the substrate, a plurality of the electronic components are electrically connected through leads disposed on the substrate, at least one of the electronic components is disposed on the periphery thereof with a protective cover connected to the substrate, the protective cover is insulated from each other by the leads and disposed on two opposite surfaces of the substrate, respectively.

The protective cover comprises a shell and an opening located on the surface of the shell, the edge of the opening is connected with the substrate, and the substrate and the shell jointly enclose an accommodating cavity for arranging the electronic element.

The utility model provides a circuit board is through setting up electronic component on the base plate, and set up the protection casing in electronic component's periphery, the casing and the base plate of protection casing enclose into the holding chamber jointly, utilize the holding chamber to set up electronic component, utilize casing protection electronic component, and reduce the oxygen content of holding intracavity, avoid this electronic component to be on fire because the short circuit in the use, and prevent that it from directly exposing arousing the intensity of a fire increase in the air, avoid influencing other electronic component's on the base plate normal use, the stability and the security of circuit board use have been protected.

In the above circuit board, optionally, a first preset distance is provided between the inner wall of the protective cover and the outer wall of the electronic component.

Through reserving first preset distance between the inner wall of protection casing and electronic component's outer wall, can avoid the protection casing to influence electronic component's normal use.

In the above circuit board, optionally, the shield is a metal member, a solder pad is disposed on the substrate, and an edge of the opening is soldered to the solder pad on the substrate.

Through set up the welding pad on the base plate, with the open-ended edge welding of welding pad and protection casing to improved the stability that the protection casing is connected on the casing, and improved the leakproofness in holding chamber in the protection casing, reduced the air volume that gets into the holding intracavity, thereby avoided electronic component to catch fire the back fire and increased.

In the above circuit board, optionally, a surface of the solder pad facing the shield is a plane, and an edge of the opening of the shield is attached to and soldered to the plane of the solder pad.

Set up for the plane through the surperficial with the welding pad, utilize plane and open-ended edge laminating to accomplish the welding, can improve both welded stability to guarantee the outward appearance aesthetic property of welding department.

In the above circuit board, optionally, a welding groove is formed in a surface of the welding pad facing the side of the shield, an edge of the opening of the shield is located in the welding groove, and the edge of the opening is welded to at least one groove wall of the welding groove.

Through set up the welding groove on the welding pad, accomplish the welding with open-ended edge setting in the welding groove, can improve the open-ended edge and the welding area of welding pad to guarantee both welded stability and firm degree.

In the above circuit board, optionally, an edge of the opening is detachably connected to the substrate.

In the above circuit board, optionally, one of the opening and the substrate is provided with a card slot, and the other of the opening and the substrate is provided with a fastener engaged with the card slot.

The edge of the opening and the substrate can be detachably connected through the clamping piece and the clamping groove, so that the protective cover and the substrate can be conveniently mounted and dismounted, and the electronic element on the protective cover or the substrate can be conveniently maintained and replaced.

In the above circuit board, optionally, the clamping groove is located on the substrate, the fastening member is located at the edge of the opening, the clamping groove is a through groove communicating a first surface and a second surface of the substrate, the first surface of the fastening member penetrates through the clamping groove to the second surface, and a second preset distance is formed between the fastening member and the wiring point of the electronic element and between the fastening member and the lead.

The second preset interval is reserved between the clamping part and the wiring point of the electronic element, so that the situation that the clamping part is in contact with the wiring point to cause wiring short circuit of the electronic element can be avoided, and the use stability of the electronic element is guaranteed.

In the above circuit board, optionally, a flame retardant member is filled between the inner wall surface of the shield and the outer wall surface of the electronic component;

and/or the inner wall surface of the protective cover is coated with an insulating layer.

Through set up the insulating layer at the internal face of protection casing, avoid can the protection casing when being the metal material, the electric breakdown condition of electronic component and protection casing takes place for the overcurrent among the electronic component, guarantees electronic component's stability in use. The flame-retardant piece is filled between the inner wall surface of the protective cover and the outer wall surface of the electronic element, so that the condition that the electronic element is spread after being ignited can be weakened.

In a second aspect, the present invention provides a household electrical appliance, including the above circuit board.

The utility model provides a household appliance, through setting up electronic component on the base plate of the circuit board at household appliance, and set up the protection casing in electronic component's periphery, the casing and the base plate of protection casing enclose into the holding chamber jointly, utilize the holding chamber to set up electronic component, utilize casing protection electronic component, and reduce the oxygen content of holding intracavity, avoid this electronic component to be on fire because the short circuit in the use, and prevent that it from directly exposing arousing the intensity of a fire increase in the air, avoid influencing other electronic component's on the base plate normal use, the stability and the security of circuit board use have been protected.

The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

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

Fig. 1 is a schematic structural diagram of a circuit board according to a first embodiment of the present invention;

fig. 2 is a top view of a circuit board according to a first embodiment of the present invention;

fig. 3 is a top view of a substrate of a circuit board according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a circuit board according to a first embodiment of the present invention;

fig. 5 is a cross-sectional view of a protective cover of a circuit board according to an embodiment of the present invention;

fig. 6 is a detailed view of a plane welding position of a protection cover and a welding pad of a circuit board according to an embodiment of the present invention;

fig. 7 is a detailed view of a welding position of a protective cover of a circuit board and a welding groove of a welding pad according to an embodiment of the present invention;

fig. 8 is a cross-sectional view of a circuit board according to a second embodiment of the present invention;

fig. 9 is a cross-sectional view of a protective cover of a circuit board according to a second embodiment of the present invention;

fig. 10 is a cross-sectional view of a circuit board according to a second embodiment of the present invention;

fig. 11 is a cross-sectional view of a protective cover of a circuit board according to a second embodiment of the present invention.

Description of reference numerals:

10-a substrate;

11-a solder pad;

111-plane;

112-a welding groove;

12-a card slot;

20-an electronic component;

30-a protective cover;

31-an opening;

311-edge;

312-a clasp;

32-accommodating chamber.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through an intermediary, a connection between two elements, or an interactive relationship between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example one

Fig. 1 is a schematic structural diagram of a circuit board according to an embodiment of the present invention. Fig. 2 is a top view of a circuit board according to an embodiment of the present invention. Fig. 3 is a top view of a substrate of a circuit board according to an embodiment of the present invention. Fig. 4 is a cross-sectional view of a circuit board according to a first embodiment of the present invention. Fig. 5 is a cross-sectional view of a protective cover of a circuit board according to an embodiment of the present invention. Fig. 6 is a detailed view of a plane welding position of a protection cover and a welding pad of a circuit board according to an embodiment of the present invention. Fig. 7 is a detailed view of a welding position of a protection cover and a welding groove of a welding pad of a circuit board according to an embodiment of the present invention.

Referring to fig. 1 to 7, the circuit board provided in the present embodiment includes a substrate 10 and a plurality of electronic components 20 disposed on the substrate 10, wherein the plurality of electronic components 20 are electrically connected through leads disposed on the substrate 10, a shield 30 connected to the substrate 10 is disposed on a periphery of at least one of the electronic components 20, and the shield 30 and the leads are insulated from each other and disposed on two opposite surfaces of the substrate 10, respectively.

The protective cover 30 comprises a housing and an opening 31 on the surface of the housing, wherein the edge 311 of the opening 31 is connected with the substrate 10, and the substrate 10 and the housing jointly enclose a containing cavity 32 for arranging the electronic component 20.

It should be noted that the circuit board provided in this embodiment includes a substrate 10 and an electronic component 20 disposed thereon, where the substrate 10 may be a printed circuit board PCB or a flexible printed circuit board FPC, and the material of the substrate 10 may be an inorganic material such as ceramic, a metal material such as copper, or a polymer material such as polyimide. The present embodiment does not impose any limitation on the material of the substrate 10, nor is it limited to the above example.

The electronic component 20 disposed on the substrate 10 may include, but is not limited to, a capacitor, a diode, a transistor, a resistor, a relay, a potentiometer, and the like, or an integrated circuit formed by the electronic component 20, and in practical use, a user may adjust a specific type and a connection manner of the electronic component 20 on the substrate 10 according to a need, which is not limited in this embodiment.

Wherein, each electronic component 20 generally all can be provided with the wiring point on the base plate 10, and connect through walking the line electricity between a plurality of wiring points, the wiring point sets up respectively in the relative both sides of base plate 10 with walking line and electronic component 20, avoids influencing each other between the three to can enlarge the space that sets up of walking the line, the user of being convenient for sets up the line structure of complicated circuit as required.

In the using process of the circuit board, a large amount of current generally flows through the electronic components 20 on the substrate 10, and part of the electronic components 20 are subjected to electrical breakdown and fire due to overlarge current, or generate heat and fire due to high working power, or the electronic components 20 on the substrate 10 are densely arranged, and the distance between adjacent electronic components 20 is too small, so that adjacent wires or wiring points are short-circuited to cause fire, and the fire condition affects the normal use of the circuit board.

In order to prevent the electronic component 20 prone to fire from affecting the stability of the electronic components around the electronic component, the present embodiment provides the protective cover 30 on the substrate 10, and forms the accommodating cavity 32 by using the protective cover 30 and the substrate 10, and places the electronic component 20 prone to fire or the electronic component 20 to be protected in the accommodating cavity 32, and protects the electronic component 20 by using the housing of the protective cover 30. On the one hand, the shell body based on the protective cover 30 can prevent the electronic element 20 which is on fire from contacting with the surrounding electronic element, so that the fire can be prevented from influencing the normal use of the surrounding electronic element. Alternatively, the enclosure 30 protects the electronic components 20 inside from the external surrounding electronic component fire. On the other hand, the housing based on the protective cover 30 can prevent the electronic component 20 from being directly exposed to the air, thereby reducing the amount of air which the electronic component 20 is exposed to when a fire occurs, and being beneficial to reducing the fire of the electronic component 20.

In this embodiment, the electronic component 20 that is prone to fire may be disposed in the protective cover 30, or the electronic component 20 that needs to be protected may be disposed in the protective cover 30, and the user may set the electronic component as needed, which is not limited in this embodiment.

Specifically, the inner wall of the shield 30 and the outer wall of the electronic component 20 have a first predetermined distance therebetween.

It should be noted that, when the electronic component 20 is used, a large amount of current flows through the inside, and a first preset distance is reserved between the inner wall of the protective cover 30 and the outer wall of the electronic component 20, so that the problem that when the protective cover 30 is made of a metal material, the high current inside the electronic component 20 is affected by the protective cover 30 to cause electrical breakdown can be avoided, and the normal use of the electronic component 20 is ensured.

Meanwhile, the first preset interval can also be used as a normal assembly gap between the electronic element and the protective cover, so that the inner wall of the protective cover 30 is prevented from extruding the electronic element 20 to influence the installation stability of the electronic element 20, the inner wall of the electronic element 20 can be prevented from abutting against the protective cover 30, and the connection stability of the protective cover 30 and the substrate 10 is ensured.

The specific value of the first preset distance is not limited in this embodiment, and the user may set the first preset distance according to the volume of the electronic component 20 and the accommodating space of the circuit board.

As an achievable embodiment, a flame retardant member is filled between the inner wall surface of the shield cover 30 and the outer wall surface of the electronic component 20. Based on the possibility of short circuit and fire of the electronic element 20 in the protective cover 30, and then the flame retardant member is filled between the protective cover 30 and the electronic element 20 in the accommodating cavity 32, the fire spread of the electronic element 20 can be prevented by using the principles of high fire point, oxygen isolation, heat insulation and the like of the flame retardant member. The flame retardant member may be an intumescent fire retardant coating, such as ammonium polyphosphate, tetrabromobisphenol or magnesium hydroxide, and the present embodiment does not limit the specific material and flame retardant principle of the flame retardant member, and is not limited to the above examples.

As an achievable embodiment, the inner wall surface of the shield 30 is coated with an insulating layer.

It should be noted that, based on the dense arrangement of the electronic components 20 on the circuit board, the internal current of the electronic components 20 is large when the electronic components 20 operate, so as to avoid the electrical breakdown between the electronic components 20 inside the protective cover 30 and the external electronic components 20; or, when the protective cover 30 itself is made of a metal material, the protective cover 30 and the electronic component 20 inside the protective cover 30 are electrically broken down, in this embodiment, the insulating layer is coated on the inner wall of the protective cover 30, and the insulating layer is used to block the movement of carriers between the electronic component 20 and the protective cover 30, so that the occurrence of an electrical breakdown phenomenon is effectively avoided, and the safety of the electronic component 20 and the circuit board is ensured.

Further, the insulating layer is coated on the inner wall surface of the protective cover 30, the insulating layer can be protected by the shell, and the insulating layer is prevented from being worn and failed after the circuit board is used for a long time. The insulating layer may be a pure inorganic coating, an organic coating, a semi-inorganic coating, or the like, such as a coating of phosphate, chromate, latex resin, or the like, and the specific material of the insulating layer is not limited in this embodiment, and is not limited to the above examples.

Specifically, the mounting stability of the shield 30 on the substrate 10 is ensured, as shown in fig. 3 to 5, the shield 30 is a metal member, the bonding pads 11 are disposed on the substrate 10, and the edge 311 of the opening 31 is bonded to the bonding pads 11 on the substrate 10.

It should be noted that, when the protection cover 30 is made of a metal material, the protection cover 30 may be disposed on the substrate 10 by welding, so as to improve the connection stability of the protection cover 30 on the housing, improve the sealing performance of the accommodating cavity 32 in the protection cover 30, and reduce the amount of air entering the accommodating cavity 32, thereby preventing the electronic component 20 from being ignited and increasing the fire.

In order to ensure the welding stability, the substrate 10 may be welded with the welding pad 11 in advance, the welding pad 11 may be fixed on the substrate 10 by tin welding, and then the shield 30 is welded on the welding pad 11, and the welding process may be performed by welding, pressure welding, or brazing, which is not limited in this embodiment.

The pre-arrangement of the bonding pads 11 can prevent the substrate 10 from being reused after the substrate 10 is directly bonded to the shield cap 30, and the pre-bonding positions can be formed on the substrate 10 by using the bonding pads 11, thereby improving the accuracy of the bonding positions of the shield cap 30 on the substrate 10.

Referring to fig. 6, as an achievable embodiment, the surface of the solder pad 11 facing the side of the shield 30 is a plane 111, and the edge 311 of the opening 31 of the shield 30 is attached and welded to the plane 111 of the solder pad 11.

It should be noted that the pre-welding surface of the welding pad 11 faces one side of the shield 30 and is the plane 111, and at this time, a flat surface adapted to the plane 111 may be disposed in the edge 311 of the opening 31 of the shield 30, so that the edge 311 of the opening 31 is attached to the stable surface of the plane 111, thereby reducing the difficulty in the welding process of the two and improving the welding stability. In this case, the welding surface is the plane 111, the welding process is less, and the welded seam is smooth and has a high appearance beauty.

Referring to fig. as another realizable embodiment, a welding groove 112 is opened on a surface of the welding pad 11 facing to a side of the shield cap 30, an edge 311 of the opening 31 of the shield cap 30 is located in the welding groove 112, and the edge 311 of the opening 31 is welded with at least one groove wall of the welding groove 112.

It should be noted that the pre-welding surface of the welding pad 11 may also be provided with a welding groove 112, and during the welding process, the edge 311 of the opening 31 of the shield 30 may be placed in the welding groove 112, and then the groove bottom and/or the groove wall of the welding groove 112 may be welded to the edge 311 of the opening 31. Compared with the plane 111, the welding surface in this embodiment may include a groove bottom and a groove wall, the welding area is larger, and the welding groove 112 may be used to fix the edge 311 of the opening 31, so as to prevent the shield 30 from shaking along a substantially horizontal direction during use, thereby improving the stability and firmness of the shield 30 during welding and use.

The user can choose between the two welding embodiments according to actual needs, and this embodiment is not limited to this.

The embodiment of the utility model provides a circuit board, through setting up electronic component on the base plate, and set up the protection casing in electronic component's periphery, the casing and the base plate of protection casing enclose into the holding chamber jointly, utilize the holding chamber to set up electronic component, utilize casing protection electronic component, and reduce the oxygen content of holding intracavity, avoid this electronic component to fire because the short circuit in the use, and prevent that it from directly exposing arousing the intensity of a fire increase in the air, avoid influencing other electronic component's normal use on the base plate, the stability and the security that the circuit board used have been protected.

Example two

Fig. 8 is a cross-sectional view of a circuit board according to a second embodiment of the present invention. Fig. 9 is a cross-sectional view of a protective cover of a circuit board according to a second embodiment of the present invention. Fig. 10 is a cross-sectional view of a circuit board according to a second embodiment of the present invention. Fig. 11 is a cross-sectional view of a protective cover of a circuit board according to a second embodiment of the present invention.

Referring to fig. 8 to 11, on the basis of the first embodiment, a second embodiment of the present invention provides a circuit board with another structure, and compared with the first embodiment, the first embodiment has the following difference: the connection of the shield cap 30 and the substrate 10 has a different structure.

Specifically, the edge 311 of the opening 31 is detachably connected to the substrate 10, one of the opening 31 and the substrate 10 is provided with a card slot 12, and the other of the opening 31 and the substrate 10 is provided with a locking member 312 engaged with the card slot 12.

It should be noted that, since the electronic component 20 and the protection mask 30 need to be periodically repaired and replaced during use, the operation process and cost of the repair and replacement process can be reduced by detachably disposing the protection mask 30 on the substrate 10. Wherein the prevention of the engagement between the latch 312 and the card slot 12 may improve the stability of the engagement therebetween.

Further, when the card slot 12 is located on the substrate 10, the locking element 312 is located at the edge 311 of the opening 31, and the card slot 12 is a through slot communicating the first surface and the second surface of the substrate 10, the locking element 312 passes through the card slot 12 from the first surface to the second surface, and a second preset distance is provided between the locking element 312 and the wiring point and the lead of the electronic component 20.

On the basis that the electronic element 20 and the wiring point on the substrate 10 are respectively located at two sides of the substrate 10, the fastener 312 is set to have a second preset distance with the wiring point and the lead, so that on one hand, the fastener 312 can be prevented from influencing the setting of the wiring point and the normal wiring process of the lead; on the other hand, when the protective cover 30 is made of metal, the short circuit between the buckling piece 312 and the wiring point or the lead can be avoided, and the normal use of the circuit board is ensured.

Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.

EXAMPLE III

On the basis of the first embodiment or the second embodiment, the third embodiment of the present invention provides a household appliance, which includes the circuit board of the first embodiment or the second embodiment.

Specifically, the household appliance may be an induction cooker, an electric kettle, an electric stewpan, a steamer, a vacuum cleaner, an air conditioner, a refrigerator, a television, a computer, or the like, and the present embodiment does not limit the specific type of the household appliance.

Taking the induction cooker as an example, the induction cooker may include a base and a panel disposed on the base, an accommodation area is defined between the base and the panel, and components such as a coil panel, a fan, and a circuit board in the first embodiment or the second embodiment are disposed in the accommodation area. The electronic component on the circuit board is electrically connected with the coil panel and the fan, and provides an electric signal for the coil panel and the fan so as to control the use states of the coil panel and the fan, and the use stability and the safety of the circuit board directly influence the use stability and the safety of the induction cooker.

Other technical features are the same as those of the first embodiment or the second embodiment, and the same technical effects can be achieved, which are not described in detail herein.

The embodiment of the utility model provides a household appliance, through setting up electronic component on the base plate of the circuit board at household appliance, and set up the protection casing in electronic component's periphery, the casing and the base plate of protection casing enclose into the holding chamber jointly, utilize the holding chamber to set up electronic component, utilize casing protection electronic component, and reduce the oxygen content of holding intracavity, avoid this electronic component to fire because of the short circuit in the use, and prevent that it from directly exposing arousing the intensity of a fire increase in the air, avoid influencing other electronic component's normal use on the base plate, the stability and the security of circuit board use have been protected.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A circuit board comprising a substrate (10) and a plurality of electronic components (20) arranged on the substrate (10), the plurality of electronic components (20) being electrically connected by leads on the substrate (10), characterized in that a shield (30) connected to the substrate (10) is provided at the periphery of at least one of the electronic components (20), the shield (30) and the leads being insulated from each other and being respectively located on opposite surfaces of the substrate (10);

the protective cover (30) comprises a shell and an opening (31) located on the surface of the shell, the edge (311) of the opening (31) is connected with the substrate (10), and the substrate (10) and the shell jointly enclose an accommodating cavity (32) for arranging the electronic element (20).

2. A circuit board according to claim 1, characterized in that the inner wall of the protective cover (30) and the outer wall of the electronic component (20) have a first predetermined spacing therebetween.

3. A circuit board according to claim 1 or 2, characterized in that the shield (30) is a metal piece, that a solder pad (11) is arranged on the substrate (10), and that an edge (311) of the opening (31) is soldered to the solder pad (11) on the substrate (10).

4. A circuit board according to claim 3, characterized in that the surface of the soldering pad (11) facing the side of the shield (30) is a plane (111), and the edge (311) of the opening (31) of the shield (30) is fitted and soldered to the plane (111) of the soldering pad (11).

5. The circuit board according to claim 3, wherein a surface of the solder pad (11) facing the side of the shield (30) is formed with a solder groove (112), an edge (311) of the opening (31) of the shield (30) is located in the solder groove (112), and the edge (311) of the opening (31) is soldered to at least one groove wall of the solder groove (112).

6. A circuit board according to claim 1 or 2, characterized in that the edge (311) of the opening (31) is detachably connected to the substrate (10).

7. The circuit board according to claim 6, wherein a card slot (12) is formed on one of the opening (31) and the substrate (10), and a fastener (312) engaged with the card slot (12) is formed on the other of the opening (31) and the substrate (10).

8. The circuit board according to claim 7, wherein the card slot (12) is located on the substrate (10), the latch (312) is located at an edge (311) of the opening (31), the card slot (12) is a through slot communicating a first surface and a second surface of the substrate (10) which are opposite to each other, the latch (312) passes through the card slot (12) from the first surface to the second surface, and a second preset distance is provided between the latch (312) and the wiring points of the electronic component (20) and the leads.

9. The circuit board according to claim 1 or 2, wherein a flame retardant member is filled between an inner wall surface of the shield cap (30) and an outer wall surface of the electronic component (20);

and/or the inner wall surface of the protective cover (30) is coated with an insulating layer.

10. A domestic appliance comprising a circuit board according to any one of claims 1-9.