Plug and household appliance

Abstract

The utility model discloses a plug and a household electrical appliance. The plug comprises a plastic package housing; the circuit board is positioned in the plastic package shell; the plug pin is provided with a first end part exposed out of the plastic package shell and a second end part located in the plastic package shell, and the second end part is electrically connected with the circuit board; the cable is provided with a connecting end part which is electrically connected with the second end part of the pin; the low-pressure injection molding body wraps the circuit board, the second end part of the pin and the outer side of the connecting end part of the cable; wherein the plastic package shell wraps the outer side of the low-pressure injection molding body. The plug provided by the utility model is relatively simple in structure and relatively convenient to assemble.

Description

A plug and a household appliance Technical Field

[0001] This utility model relates to a plug and a household appliance, and in particular to an integrated plug. Background Technology

[0002] A plug is a connector (such as a power connector) located at one end of a wire, which can be inserted into a socket to connect a circuit. For example, a power supply structure at the end of a power cord connects an appliance to a power source. Plugs typically include prongs, and may also include a circuit board to house functional components, such as an electromagnetic compatibility (EMC) module, to ensure good electromagnetic compatibility. Currently, most integrated plugs on the market are assembled, where the circuit board is pre-encapsulated in a plastic housing, and then the prongs and cables are assembled to make the prongs conductive to the circuit board. This results in a more cumbersome assembly process, consuming more time and labor, and lower work efficiency.

[0003] The above background information is provided only to assist in understanding the inventive concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application, nor does it necessarily provide technical teaching. In the absence of clear evidence that the above information was disclosed before the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a plug with an integrated structure, which is simple in structure, easy to assemble, and easy to mass-produce. This embodiment also provides a household appliance using this plug.

[0005] The present invention adopts the following technical solution:

[0006] A plug, comprising:

[0007] Plastic-sealed casing;

[0008] A circuit board located within the plastic-encapsulated housing;

[0009] A pin having a first end exposed outside the plastic enclosure and a second end located inside the plastic enclosure, the second end being electrically connected to the circuit board;

[0010] A cable having a connection end electrically connected to the second end of the pin;

[0011] A low-pressure injection molded body that wraps around the outside of the circuit board, the second end of the pin, and the connecting end of the cable;

[0012] The plastic-encapsulated shell is wrapped around the outside of the low-pressure injection molded body.

[0013] Preferably, the circuit board is equipped with an electromagnetic compatibility (EMC) module. The plug has EMC functionality, ensuring that the household appliance can operate normally in complex electromagnetic environments without causing unacceptable interference to other electronic devices.

[0014] More preferably, the electromagnetic compatibility module includes a filter capacitor.

[0015] Preferably, the low-pressure injection molded body is wrapped with hot melt adhesive through a low-pressure injection molding process on the circuit board, the second end of the pin, and the connection end of the cable. Using low-pressure injection molding effectively protects the components on the circuit board from damage.

[0016] More preferably, the hot melt adhesive comprises a polyamide resin.

[0017] Preferably, the plug includes a plurality of pins and a connecting piece that connects and insulates the plurality of pins from each other. The connecting piece is encapsulated in the plastic housing. The first end of each pin is located on one side of the connecting piece, and the circuit board, the connecting end of the cable, and the low-pressure injection molded body are located on the opposite side of the connecting piece.

[0018] Preferably, there is a gap between the circuit board and the connecting piece, and the low-pressure injection molded body fills the gap. The plug has a relatively stable and reliable structure.

[0019] Preferably, the circuit board and the pin are soldered together, the connecting end of the cable and the second end of the pin are soldered together, the cable is a power transmission cable for transmitting power, and the plug is a power plug. The circuit board is directly connected to the pin, resulting in a simple structure, convenient and quick assembly, and a small overall size of the plug.

[0020] Preferably, the encapsulated shell is a PVC shell. The PVC shell has advantages such as being lightweight, easy to process, having good insulation, and being inexpensive.

[0021] This utility model also adopts the following technical solution:

[0022] A household appliance, including the aforementioned plug.

[0023] In a preferred embodiment, the plug is a power plug configured to connect a household appliance to a power source.

[0024] Optionally, the household appliance includes hair dryers, electric fans, etc.

[0025] The present invention adopts the above solution and has the following advantages compared with the prior art:

[0026] The plug of this utility model adopts an integrated structure. During assembly, the circuit board and the pins can be directly soldered together first. The circuit board, pins and the end of the cable are directly wrapped by a low-pressure injection molding body. Then, a plastic shell is used to wrap the outside of the low-pressure injection molding body. The plug structure is relatively simple and the assembly is relatively convenient. It can save time, improve work efficiency, and the assembled plug is small in size.

[0027] In some preferred embodiments, the plug itself has EMC functionality and is suitable for use as a power plug. Attached Figure Description

[0028] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 is a perspective view of a plug according to an embodiment of the present utility model;

[0030] Figure 2 is a structural diagram of the plug pins and circuit board in Figure 1 after they are connected;

[0031] Figure 3 is a structural diagram of the structure shown in Figure 2 after further connecting the cables;

[0032] Figure 4 is a structural diagram of the structure shown in Figure 3 after a low-pressure injection molded body is installed.

[0033] in,

[0034] 1. Plug;

[0035] 11. Plastic-sealed outer casing;

[0036] 12. Circuit board; 120. Electromagnetic compatibility module; 121. Groove;

[0037] 13. Pin; 131. First end; 132. Second end;

[0038] 14. Cable; 141. Connector end;

[0039] 15. Low-pressure injection molded parts;

[0040] 16. Connecting piece. Detailed Implementation

[0041] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to aid in understanding the present invention, but does not constitute a limitation thereof.

[0042] This embodiment relates to a plug, such as a power plug, for connecting an appliance to a power source. Specifically, the plug is an integrated plug with EMC functionality, providing good electromagnetic compatibility. This embodiment also relates to a household appliance using this plug, for example, a device that can connect the appliance to a power source via the plug. The household appliance may include a hair dryer, an electric fan, etc.

[0043] Referring to Figures 1 to 4, the plug 1 provided in this embodiment includes a plastic-encapsulated shell 11, a circuit board 12, pins 13, a cable 14, and a low-pressure injection molded body 15. The plastic-encapsulated shell 11 wraps around the low-pressure injection molded body 15. In this embodiment, the plastic-encapsulated shell 11 is specifically a PVC shell, which has advantages such as being lightweight, easy to process, having good insulation, and being inexpensive.

[0044] Circuit board 12 is located within plastic-encapsulated housing 11, and electromagnetic compatibility module 120 is mounted on circuit board 12. Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate within its electromagnetic environment without causing unacceptable electromagnetic interference to any other device in that environment. Further, EMC specifically includes two aspects: firstly, the electromagnetic interference generated by the device during normal operation must not exceed certain limits; secondly, the device must have a certain degree of immunity to electromagnetic interference present in its environment, i.e., electromagnetic susceptibility. In this embodiment, the electromagnetic compatibility module 120 specifically includes filter capacitors; the number of filter capacitors on the circuit board is not limited, and there may be one or more filter capacitors.

[0045] Referring to FIG3, the plug 13 has a first end 131 exposed outside the plastic casing 11 and a second end 132 located inside the plastic casing 11. The second end 132 is electrically connected to the circuit board 12, and the first end 131 is used for electrical connection to a household socket. Further, the cable 14 has a connecting end 141, which is electrically connected to the second end 132 of the plug 13. The cable 14 is a power transmission cable (or power cord) for transmitting power, and the plug is a power plug.

[0046] Referring to FIG2, the low-pressure injection molded body 15 is wrapped around the outside of the circuit board 12, the second end 132 of the pin 13, and the connection end 141 of the cable 14. Specifically, the low-pressure injection molded body 15 is wrapped around the circuit board 12, the second end 132 of the pin 13, and the connection end 141 of the cable 14 with hot melt adhesive through a low-pressure injection molding process. The hot melt adhesive includes polyamide resin.

[0047] Specifically, low-pressure injection molding is an injection molding method that injects low-pressure injection material into a mold at very low injection pressure (0.5-4 MPa) and allows it to solidify rapidly, thus minimizing damage to the encapsulated or bonded parts. In this embodiment, low-pressure injection molding is primarily used to protect the power components on circuit board 12 from damage. Traditional injection molding processes are defective due to excessive pressure, while low-pressure molding requires only a small amount of pressure to allow hot melt adhesive to flow into a small mold space, thus preventing damage to the fragile components that need to be encapsulated and significantly reducing the scrap rate of the circuit board.

[0048] As shown in Figure 2, there are multiple pins 13, which are interconnected by a connecting piece 16, which insulates the pins 13 from each other. The connecting piece 16 can be a plastic sheet. In this embodiment, there are two pins 13; in other embodiments, there may be three pins 13. After the plug 1 is assembled, the connecting piece 16 is encapsulated in a plastic shell 11. The first end 131 of each pin 13 is located on one side of the connecting piece 16, while the connecting ends 141 of the circuit board 12, the cable 14, and the low-pressure injection molded body 15 are located on the opposite side of the connecting piece 16.

[0049] Furthermore, the connecting piece 16 has two through holes. During assembly, the two pins 13 are respectively inserted into the through holes and soldered to the circuit board 12, that is, the circuit board 12 and the pins 13 are soldered together. More specifically, the connecting end 141 of the cable 14 and the second end 132 of the pin 13 are soldered together. Referring to FIG4, the circuit board 12 has two connecting slots 121, through which the pins 13 pass and are electrically connected to the cable 13.

[0050] As can be seen from Figure 3, there is a gap between the circuit board 12 and the connecting piece 16. The low-pressure injection molding body 15 fills the gap. The low-pressure injection molding body 15 can not only protect the power components on the circuit board 12, but also make the overall structure of the plug more stable and reliable, especially the circuit board 12 and the cable 14 are in a relatively stable state.

[0051] In the manufacturing process of this embodiment, the two pins 13 and the connecting piece 16 are first injection molded together. Then, the circuit board 12 with EMC function is soldered together with the pins 13. The N and L terminals of the cable 14 ("N" represents the neutral wire and "L" represents the live wire) are soldered together with the two pins 13 respectively. After that, a low-pressure injection molding process is used to ensure the stability of the circuit board and the cable. Finally, the plastic encapsulation shell 11 is wrapped around the outside of the low-pressure injection molded body 15.

[0052] In this embodiment, the circuit board 12 is directly soldered to the pin 13, and the circuit board 12 has EMC function. That is, the plug 13 in this embodiment is an integrated plug with EMC function, which is small in size and occupies less space. The plug in this embodiment can also be used for different national standards. Only the exposed part of the plug needs to comply with the safety regulations of each country. The structure and process are relatively simple, easy to assemble, and convenient for mass production.

[0053] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0054] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this utility model are only relative to the relative positional relationships of the various components of this utility model in the accompanying drawings.

[0055] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

[0057] The above embodiments are only for illustrating the technical concept and features of this utility model, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly, and should not be construed as limiting the protection scope of this utility model. All equivalent transformations or modifications made based on the principles of this utility model should be covered within the protection scope of this utility model.

Claims

1. A plug, characterized in that, include: Plastic-sealed casing; A circuit board located within the plastic-encapsulated housing; A pin having a first end exposed outside the plastic casing and a second end located inside the plastic casing, the second end being electrically connected to the circuit board; a cable having a connecting end electrically connected to the second end of the pin; a low-pressure injection molded body covering the outside of the circuit board, the second end of the pin, and the connecting end of the cable; wherein the plastic casing covers the outside of the low-pressure injection molded body.

2. The plug according to claim 1, characterized in that, The circuit board is equipped with an electromagnetic compatibility module.

3. The plug according to claim 2, characterized in that, The electromagnetic compatibility module includes a filter capacitor.

4. The plug according to claim 1, characterized in that, The low-pressure injection molded body is wrapped with hot melt adhesive through a low-pressure injection molding process on the circuit board, the second end of the pin, and the connection end of the cable.

5. The plug according to claim 4, characterized in that, The hot melt adhesive includes polyamide resin.

6. The plug according to claim 1, characterized in that, The plug includes a plurality of pins and a connecting piece that connects and insulates the plurality of pins from each other. The connecting piece is encapsulated in a plastic shell. The first end of each pin is located on one side of the connecting piece, and the circuit board, the connecting end of the cable, and the low-pressure injection molded body are located on the opposite side of the connecting piece.

7. The plug according to claim 6, characterized in that, There is a gap between the circuit board and the connecting piece, and the low-pressure injection molded body fills the gap.

8. The plug according to claim 1, characterized in that, The circuit board and the pin are soldered together, the connecting end of the cable and the second end of the pin are soldered together, the cable is a power transmission cable for transmitting power, and the plug is a power plug.

9. The plug according to claim 1, characterized in that, The encapsulated shell is a PVC shell.

10. A household appliance, characterized in that, Includes the plug as described in any one of claims 1 to 9.

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