Circuit board grounding device and household appliance

Abstract

The utility model discloses a circuit board grounding device and a household electrical appliance, the circuit board grounding device comprises a housing, a circuit board and a conductor assembly, the housing is used for being connected with a first ground wire of an external power supply, the circuit board is provided with a working area and a conductive area, the working area is connected with the conductive area, and the conductive area comprises a first copper foil layer; the first copper foil layer is conductively connected with the shell through a conductor assembly. According to the technical scheme of the utility model, the housing is connected with the first ground wire of the external power supply, so that the housing is grounded, and then the circuit board is directly and conductively connected with the housing through the conductor assembly, so that the circuit board is grounded through the housing, thereby protecting household electrical appliances and preventing personal electric shock hazards. Compared with a device in which the circuit board is grounded with the shell through the wire harness, the technical scheme of the utility model realizes conductive connection through the conductor assembly, reduces the installation steps of the wire harness and the control difficulty of the wire harness, and also can effectively reduce the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a circuit board grounding device and a household appliance. Background Art

[0002] Circuit boards in the home appliance field generally need to be grounded to prevent personal electric shock hazards and protect products. However, many circuit boards on the market are grounded by first connecting the ground wire to the sheet metal shell through the power cord, and then leading a ground wire from the circuit board to the sheet metal shell to achieve grounding. However, this grounding method requires the production and installation of a ground wire on the circuit board, which will make the installation steps and material control more difficult and increase costs. Utility Model Content

[0003] The main purpose of the utility model is to provide a circuit board grounding device and a household appliance, aiming to solve the problems of difficulty and high cost in installation steps and material control when grounding a circuit board.

[0004] To achieve the above-mentioned purpose, the utility model proposes a circuit board grounding device, which includes a shell, a circuit board and a conductor assembly, the shell is used to connect to a first ground wire of an external power supply, the circuit board has a working area and a conductive area, the working area is connected to the conductive area, and the conductive area includes a first copper foil layer; the first copper foil layer is conductively connected to the shell through the conductor assembly.

[0005] In one embodiment, the conductor assembly includes a conductive screw, the conductive area is provided with a first mounting hole, the shell is provided with a second mounting hole corresponding to the first mounting hole, and the conductive screw passes through the first mounting hole and the second mounting hole to electrically connect the circuit board and the shell.

[0006] In one embodiment, the conductive area also includes a first signal layer, the first copper foil layer and the first signal layer are arranged sequentially along the axial direction of the second mounting hole, the first mounting hole penetrates the first copper foil layer and the first signal layer, and the head of the conductive screw can abut against the first copper foil layer.

[0007] In one embodiment, the conductor assembly further includes a conductive gasket, which is disposed between the head of the conductive screw and the first copper foil layer, with one side of the conductive gasket abutting against the head of the conductive screw and the other side of the conductive gasket abutting against the first copper foil layer.

[0008] In one embodiment, the working area includes a first insulating layer, a second copper foil layer and a second signal layer, the first insulating layer, the second copper foil layer and the second signal layer are arranged in sequence along the axial direction of the second mounting hole, the second copper foil layer is connected to the first copper foil layer, and the second signal layer is connected to the first signal layer.

[0009] In one embodiment, a boss is provided on the housing, and the boss is provided with the second mounting hole.

[0010] In one embodiment, there are a plurality of bosses, the plurality of bosses are arranged at intervals, and the number of the bosses is consistent with the number of the second mounting holes and are arranged in a one-to-one correspondence.

[0011] In one embodiment, the circuit board grounding device further includes a fastener, the working area is provided with a third mounting hole, and the fastener is used to pass through the third mounting hole and the second mounting hole not provided with the conductive screw to connect the circuit board and the conductor assembly.

[0012] In one embodiment, a power interface is provided on the circuit board, a plug interface and a ground wire interface are provided on the housing, and the circuit board grounding device also includes a connecting wire, which includes a plug connector, a live wire, a neutral wire and a ground wire, wherein the live wire, the neutral wire and the ground wire are all connected to one end of the plug connector, and the other end of the plug connector passes through the plug interface and is connected to the first ground wire of the external power supply, an end of the ground wire away from the plug connector is connected to the ground wire interface, and an end of the live wire and the neutral wire away from the plug connector are both connected to the power interface.

[0013] In addition, the utility model also proposes a household appliance, which includes an external power cord and a circuit board grounding device as described in any of the above technical solutions, and one end of the external power cord is used to be connected to the external power supply.

[0014] In an embodiment of the utility model, the shell is used to be connected to a first ground wire of an external power supply so that the shell is grounded, the working area of ​​the circuit board is used to connect electronic components and control electronic equipment, the conductive area of ​​the circuit board is connected to the working area, and the conductive area is used to be conductively connected to the shell so that the circuit board is also grounded through the shell. Specifically, the conductive area includes a first copper foil layer, and the conductor assembly is used to connect the first copper foil layer and the shell. The conductive connection between the first copper foil layer and the shell is achieved through the conductor assembly, so that the circuit board is grounded through the shell. When the circuit board has leakage, the leakage current can be conducted to the conductor assembly through the first copper foil layer, and then conducted to the shell by the conductor assembly to achieve grounding, thereby reducing the damage to the circuit board caused by the leakage current and preventing the risk of electric shock to people. The embodiment of the utility model connects the shell to the first ground wire of the external power supply to ground the shell, and then directly connects the circuit board to the shell through a conductor component, so that the circuit board is also grounded through the shell, so as to protect the household electrical appliances and prevent the risk of electric shock to people. Compared with the device in which the circuit board is grounded to the shell through a wiring harness, the technical solution of the utility model realizes conductive connection through a conductor component, reduces the installation steps of the wiring harness and the difficulty of managing the wiring harness, and can also effectively reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of an embodiment of a circuit board grounding device of the utility model;

[0017] Figure 2 It is a structural schematic diagram of another perspective of an embodiment of the circuit board grounding device of the utility model;

[0018] Figure 3 It is a cross-sectional view of an embodiment of the circuit board grounding device of the utility model;

[0019] Figure 4 The utility model is a schematic diagram of the structure of a circuit board of the circuit board grounding device.

[0020] Description of Figure Numbers:

[0021]

[0022]

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0026] The main purpose of the utility model is to provide a circuit board grounding device and a household appliance, aiming to solve the problems of difficulty and high cost in installation steps and material control when grounding a circuit board.

[0027] The utility model provides a circuit board grounding device.

[0028] like Figures 1 to 3 As shown, in one embodiment of the utility model, the circuit board grounding device 100 includes a shell 1, a circuit board 2 and a conductor component 3, the shell 1 is used to connect to a first ground wire (not shown) of an external power supply 300, the circuit board 2 has a working area 22 and a conductive area 21, the working area 22 is connected to the conductive area 21, the conductive area 21 includes a first copper foil layer 211; the first copper foil layer 211 is conductively connected to the shell 1 through the conductor component 3.

[0029] In an embodiment of the utility model, the housing 1 is used to be connected to the first ground wire of the external power supply 300 so that the housing 1 is grounded, the working area 22 of the circuit board 2 is used to connect electronic components and control electronic equipment, the conductive area 21 of the circuit board 2 is connected to the working area 22, and the conductive area 21 is used to be conductively connected to the housing 1 so that the circuit board 2 is also grounded through the housing 1. Specifically, the conductive area 21 includes a first copper foil layer 211, and the conductor component 3 is used to connect the first copper foil layer 211 and the housing 1. The conductive connection between the first copper foil layer 211 and the housing 1 is achieved through the conductor component 3, so that the circuit board 2 is grounded through the housing 1. When the circuit board 2 has a leakage phenomenon, the leakage current can be conducted to the conductor component 3 through the first copper foil layer 211, and then conducted to the housing 1 by the conductor component 3 to achieve grounding, thereby reducing the damage to the circuit board 2 caused by the leakage current and preventing the risk of electric shock to people.

[0030] The technical solution of the utility model connects the shell 1 to the first ground wire of the external power supply 300 to ground the shell 1, and then directly connects the circuit board 2 to the shell 1 through the conductor component 3 for conductive connection, so that the circuit board 2 is also grounded through the shell 1, so as to protect the household electrical appliances and prevent the risk of electric shock to people. Compared with the device in which the circuit board 2 is grounded to the shell 1 through the wiring harness, the technical solution of the utility model realizes conductive connection through the conductor component 3, reduces the installation steps of the wiring harness and the difficulty of managing the wiring harness, and can also effectively reduce the production cost.

[0031] In one embodiment, the conductor component 3 includes a conductive screw 31, the conductive area 21 is provided with a first mounting hole 213, and the housing 1 is provided with a second mounting hole (not shown) corresponding to the first mounting hole 213. The conductive screw 31 passes through the first mounting hole 213 and the second mounting hole to make the circuit board 2 and the housing 1 conductively connected; specifically, the conductive screw 31 plays a role of conduction and fixing. The screw of the conductive screw 31 passes through the first mounting hole 213 and is threadedly connected with the second mounting hole, so that the head of the conductive screw 31 can abut against the first copper foil layer 211, so that the first copper foil layer 211 is conductively connected with the housing 1 through the conductive screw 31. When the circuit board 2 has a leakage phenomenon, the leakage current can be conducted to the conductor component 3 through the first copper foil layer 211, and then conducted to the housing 1 by the conductor component 3 to achieve grounding, thereby reducing the damage to the circuit board 2 caused by the leakage current and preventing the risk of electric shock to people. In addition, the threaded connection between the conductive screw 31 and the second mounting hole also facilitates the installation and disassembly of the circuit board 2 and the housing 1.

[0032] According to one embodiment of the utility model, the conductor component 3 includes a conductive glue layer, which connects the first copper foil layer 211 and the shell 1 through the conductive glue layer, thereby realizing a conductive connection between the circuit board 2 and the shell 1. When the circuit board 2 has a leakage phenomenon, the leakage current can be conducted to the conductive glue layer through the first copper foil layer 211, and then conducted to the shell 1 by the conductive glue layer to achieve grounding, thereby reducing the damage to the circuit board 2 caused by the leakage current and preventing the risk of electric shock to people.

[0033] In one embodiment, the conductive area 21 also includes a first signal layer 212, the first copper foil layer 211 and the first signal layer 212 are arranged in sequence along the axial direction of the second mounting hole, the first mounting hole 213 penetrates the first copper foil layer 211 and the first signal layer 212, and the head of the conductive screw 31 can abut against the first copper foil layer 211; specifically, the first copper foil layer 211 is exposed to the environment, one side of the first copper foil layer 211 is connected to the first signal layer 212, the first signal layer 212 is used to connect electronic components and control electronic equipment, the first signal layer 212 includes a plurality of second insulating layers 2121 and a plurality of third copper foil layers 2122, and the plurality of second insulating layers 2121 and the plurality of third copper foil layers 2122 are alternately stacked in sequence, and the screw of the conductive screw 31 passes through the first mounting hole 213 and is threadedly connected to the second mounting hole, so that the head of the conductive screw 31 can abut against the first copper foil layer 211, thereby enabling the first copper foil layer 211 to be conductively connected to the housing 1 through the conductive screw 31.

[0034] In one embodiment, the conductor component 3 also includes a conductive gasket 32, which is arranged between the head of the conductive screw 31 and the first copper foil layer 211, one side of the conductive gasket 32 ​​abuts against the head of the conductive screw 31, and the other side of the conductive gasket 32 ​​abuts against the first copper foil layer 211; by providing the conductive gasket 32, the contact area between the head of the conductive screw 31 and the first copper foil layer 211 can be increased, the conductivity can be improved, and the pressure transmitted from the head of the conductive screw 31 to the first copper foil layer 211 can be reduced when the conductive screw 31 is tightened to fix the circuit board 2 and the housing 1, thereby preventing the first copper foil layer 211 from being damaged.

[0035] like Figure 4As shown, in one embodiment, the working area 22 includes a first insulating layer 221, a second copper foil layer 222, and a second signal layer 223. The first insulating layer 221, the second copper foil layer 222, and the second signal layer 223 are sequentially arranged along the axial direction of the second mounting hole. The second copper foil layer 222 is connected to the first copper foil layer 211, and the second signal layer 223 is connected to the first signal layer 212. Specifically, compared with the conductive area 21, the working area 22 has the first insulating layer 221 connected to the upper surface of the second copper foil layer 222, so that the second copper foil layer 222 cannot be exposed to the environment, while the first copper foil layer 211 is directly exposed to the environment. The second copper foil layer 22 2 is connected to the first copper foil layer 211, and the lower surface of the second copper foil layer 222 is connected to the second signal layer 223, the second signal layer 223 is used to connect electronic components and control electronic equipment, the structure of the second signal layer 223 is the same as that of the first signal layer 212, the second signal layer 223 includes a plurality of third insulating layers 2231 and a plurality of fourth copper foil layers 2232, and the plurality of third insulating layers 2231 and the plurality of fourth copper foil layers 2232 are alternately stacked in sequence, and the plurality of third insulating layers 2231 are connected to the plurality of second insulating layers 2121 in one-to-one correspondence, and the plurality of fourth copper foil layers 2232 are connected to the plurality of third copper foil layers 2122 in one-to-one correspondence.

[0036] In one embodiment, a boss 11 is provided on the housing 1, and a second mounting hole is provided on the boss 11; in order to prevent the circuit board 2 from being directly mounted on the housing 1 and causing deformation and damage to the circuit board 2, a boss 11 is provided on the housing 1, and a second mounting hole is provided on the boss 11. By conductively connecting the circuit board 2 and the boss 11, a gap is formed between the circuit board 2 and the housing 1, thereby ensuring the performance of the circuit board 2.

[0037] In one embodiment, there are multiple bosses 11, and the multiple bosses 11 are arranged at intervals. The number of bosses 11 is consistent with that of the second mounting holes and they are arranged one by one. In order to ensure the stability of the installation of the circuit board 2 and the housing 1, there are multiple bosses 11. In this embodiment, there are four bosses 11, and the four bosses 11 are correspondingly provided with second mounting holes. The four bosses 11 can be arranged along the four corners of the circuit board 2 to ensure the stability of the installation of the circuit board 2.

[0038] In one embodiment, the circuit board grounding device 100 also includes a fastener 4, and the working area 22 is provided with a third mounting hole 224. The fastener 4 is used to pass through the third mounting hole 224 and the second mounting hole without the conductive screw 31 to connect the circuit board 2 and the conductor assembly 3; specifically, the fastener 4 is used to install and fix the working area 22 and the shell 1. In this embodiment, the fastener 4 can use a conductive screw 31, and the screw of the conductive screw 31 passes through the third mounting hole 224 and is threadedly connected with the second mounting hole, so that the head of the conductive screw 31 can abut against the first insulating layer 221 of the working area 22, thereby realizing the connection between the circuit board 2 and the shell 1. The fastener 4 uses the conductive screw 31, which not only facilitates the installation and disassembly of the circuit board 2 and the shell 1, but also reduces the difficulty of material management.

[0039] According to one embodiment of the utility model, the fastener 4 may also adopt other structures, such as ordinary screws, rivets or anti-rotation pins, by passing the ordinary screws, rivets or anti-rotation pins through the third mounting hole 224 and the second mounting hole where the conductive screws 31 are not provided to connect the circuit board 2 and the conductor assembly 3.

[0040] In the present embodiment, the number of bosses 11 is four, and the four bosses 11 are respectively provided with second mounting holes, and the number of first mounting holes 213 of the conductive area 21 is one, that is, only one conductive screw 31 is required to pass through the first mounting hole 213 and then be threadedly connected with the second mounting hole, so as to realize the grounding connection between the circuit board 2 and the housing 1; the number of third mounting holes 224 of the working area 22 is three, that is, three fasteners 4 are required to pass through the three third mounting holes 224 and then be threadedly connected with the second mounting holes, so as to realize the fixed connection between the circuit board 2 and the housing 1; in the present embodiment, only one conductive screw 31 is required to connect the first copper foil layer 211 and the housing 1, so as to realize the grounding connection between the circuit board 2 and the housing 1, and there is only one conductive area 21 to expose the first copper foil layer 211 to the environment. Compared with the structure in which four conductive areas 21 are correspondingly provided with four first mounting holes 213, the present embodiment can reduce the number of first copper foil layers 211 exposed to the environment, thereby reducing the workload of cleaning the first insulating layer 221, effectively reducing the difficulty of work and improving work efficiency.

[0041] According to an embodiment of the utility model, the circuit board 2 has four conductive areas 21, and the four conductive areas 21 are all correspondingly provided with first mounting holes 213, and the number of the first mounting holes 213 is consistent with the number of the second mounting holes and is arranged one by one, that is, the circuit board 2 can be threadedly connected with the second mounting holes after four conductive screws 31 pass through the third mounting holes 224 respectively, so that the heads of the four conductive screws 31 can abut against the four first copper foil layers 211, so that the four first copper foil layers 211 can achieve conductive connection with the housing 1 through the conductive screws 31.

[0042] In one embodiment, a power interface 23 is provided on the circuit board 2, a plug interface (not shown) and a ground interface 13 are provided on the housing 1, and the circuit board grounding device 100 also includes a connecting line 5, which includes a plug connector 51, a live wire 52, a neutral wire 53 and a second ground wire 54. The live wire 52, the neutral wire 53 and the second ground wire 54 are all connected to one end of the plug connector 51, and the other end of the plug connector 51 passes through the plug interface and is connected to the first ground wire of the external power supply 300. The end of the second ground wire 54 away from the plug connector 51 is connected to the ground interface 13, and the ends of the live wire 52 and the neutral wire 53 away from the plug connector 51 are both connected to the power interface 23 Specifically, the live wire 52 and the neutral wire 53 of the connecting wire 5 are both connected to the power interface 23, so as to realize power supply to the circuit board 2. The plug interface on the shell 1 is used to fix the plug connector 51. After the first ground wire of the external power supply 300 is connected to the plug connector 51, it is connected to the ground wire interface 13 of the shell 1 through the second ground wire 54 of the connecting wire 5, so as to realize the grounding of the shell 1. Therefore, when the circuit board 2 is conductively connected to the shell 1, it can also be grounded; when the circuit board 2 has a leakage phenomenon, the leakage current is conducted through the circuit board 2 to the shell 1 to realize grounding, thereby reducing the damage to the circuit board 2 caused by the leakage current and preventing the risk of electric shock to people.

[0043] The utility model also proposes a household appliance, which includes an external power cord 200 and a circuit board grounding device 100. The specific structure of the circuit board grounding device 100 refers to the above embodiment. Since the household appliance adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, one end of the external power cord 200 is used to connect to the external power supply 300, and the other end of the external power cord 200 is connected to the plug connector 51. The first ground wire of the external power supply 300 is connected to the ground wire interface 13 of the housing 1 through the plug connector 51 and the second ground wire 54 of the connecting wire 5, thereby realizing the grounding of the housing 1, and the live wire 52 and the neutral wire 53 of the external power supply 300 are connected to the power interface 23 of the circuit board 2 through the plug connector 51 and the live wire 52 and the neutral wire 53 of the connecting wire 5, thereby realizing the external power supply 300 to the circuit board 2 of the household appliance.

[0044] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A circuit board grounding device, characterized in that: The circuit board grounding device includes a shell, a circuit board and a conductor component, the shell is used to connect to a first ground wire of an external power supply, the circuit board has a working area and a conductive area, the working area is connected to the conductive area, the conductive area includes a first copper foil layer; the first copper foil layer is conductively connected to the shell through the conductor component.

2. The circuit board grounding device according to claim 1, characterized in that: The conductor assembly includes a conductive screw, the conductive area is provided with a first mounting hole, the housing is provided with a second mounting hole corresponding to the first mounting hole, and the conductive screw passes through the first mounting hole and the second mounting hole to electrically connect the circuit board and the housing.

3. The circuit board grounding device according to claim 2, characterized in that: The conductive area also includes a first signal layer. The first copper foil layer and the first signal layer are arranged in sequence along the axial direction of the second mounting hole. The first mounting hole penetrates the first copper foil layer and the first signal layer. The head of the conductive screw can abut against the first copper foil layer.

4. The circuit board grounding device according to claim 3, characterized in that: The conductor assembly further includes a conductive gasket, which is disposed between the head of the conductive screw and the first copper foil layer, with one side of the conductive gasket abutting against the head of the conductive screw and the other side of the conductive gasket abutting against the first copper foil layer.

5. The circuit board grounding device according to claim 3, characterized in that: The working area includes a first insulating layer, a second copper foil layer and a second signal layer. The first insulating layer, the second copper foil layer and the second signal layer are arranged in sequence along the axial direction of the second mounting hole. The second copper foil layer is connected to the first copper foil layer, and the second signal layer is connected to the first signal layer.

6. The circuit board grounding device according to any one of claims 2 to 5, characterized in that: The shell is provided with a boss, and the boss is provided with the second mounting hole.

7. The circuit board grounding device according to claim 6, characterized in that: The number of the bosses is multiple, and the multiple bosses are arranged at intervals. The number of the bosses is consistent with that of the second mounting holes and they are arranged in a one-to-one correspondence.

8. The circuit board grounding device according to claim 7, characterized in that: The circuit board grounding device also includes a fastener, the working area is provided with a third mounting hole, and the fastener is used to pass through the third mounting hole and the second mounting hole not provided with the conductive screw to connect the circuit board and the conductor assembly.

9. The circuit board grounding device according to any one of claims 1 to 5, characterized in that: A power interface is provided on the circuit board, a plug interface and a ground interface are provided on the shell, and the circuit board grounding device also includes a connecting wire, which includes a plug connector, a live wire, a neutral wire and a second ground wire. The live wire, the neutral wire and the ground wire are all connected to one end of the plug connector, and the other end of the plug connector passes through the plug interface and is connected to the first ground wire of the external power supply. One end of the ground wire away from the plug connector is connected to the ground interface, and one end of the live wire and the neutral wire away from the plug connector are both connected to the power interface.

10. A household appliance, characterized in that: The household appliance comprises an external power cord and a circuit board grounding device according to any one of claims 1 to 9, and one end of the external power cord is used to be connected to the external power supply.

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