Power plug

Abstract

The invention discloses a power plug which comprises a shell, an overheat protection module, pins and a wire, an accommodating space is formed in the shell to accommodate the overheat protection module, and the overheat protection module comprises a conductive plate, a thermal circuit breaker and a follow current resistor. Wherein the freewheeling resistor and the thermal circuit breaker are fixed on the same side of the current-conducting plate and are connected in parallel through the current-conducting plate, so that the circuit connection of the power plug is ensured when the thermal circuit breaker is disconnected. According to the invention, the conductive plate is respectively connected with the pin and the wire, and the thermal circuit breaker and the follow current resistor are fixedly arranged at the same side of the conductive plate, so that the power plug can still continuously provide small current for an electric appliance after the thermal circuit breaker is disconnected, the size required by the power plug is reduced, and a rigid structure is not required to protect the thermal circuit breaker; therefore, the power plug is simple to process, compact in structure and capable of being applied to different use scenes.

Description

Technical Field

[0001] The invention relates to the technical field of power supply devices for electronic products, and in particular to a power plug. Background Art

[0002] For various electronic products in modern society, electricity safety is of vital importance in production and life. The power plug of an electronic product is directly connected to the power supply. If there are problems such as excessive instantaneous power or poor contact between the plug and socket when the electronic product is working, it is easy to cause the power plug to overheat and burn, thereby causing safety problems. Therefore, in the prior art, a thermal circuit breaker is usually set in the power plug. When it is detected that the power plug reaches a preset temperature, the thermal circuit breaker disconnects the circuit of the power plug to play a role in overheating protection. At the same time, in order to ensure that the power plug can continue to provide current (milliampere level) to the electronic product after the circuit is disconnected due to overheating, thereby realizing subsequent safety measures such as alarm, the prior art often adds a freewheeling module to the thermal circuit breaker to ensure that the power plug can continue to power the appliance after the thermal circuit breaker is disconnected due to reaching a preset temperature.

[0003] For this type of power plug in the prior art, since it accommodates the thermal circuit breaker and the freewheeling module, the volume of the entire power plug needs to be enlarged. In addition, in order to reserve movement space for the thermal circuit breaker and prevent the circuit connection of the thermal circuit breaker or the freewheeling module from being affected during the assembly of the power plug, it is often necessary to wrap the thermal circuit breaker with a rigid shell first, which makes assembly difficult and will further increase the required volume of the power plug, affecting the application of the power plug in different scenarios.

[0004] Therefore, the power plug in the prior art still needs to be further improved. Summary of the invention

[0005] In view of the defects in the prior art, the present invention proposes a power plug to solve the problem in the prior art that in order to ensure that the electrical appliance continues to be powered after the thermal circuit breaker is disconnected, the power plug assembly becomes more complicated and the size is too large.

[0006] The technical solution of the present invention is as follows:

[0007] A first aspect of the present invention provides a power plug, comprising a housing, an overheat protection module, a plug pin and a wire, wherein a receiving space is formed inside the housing to receive the overheat protection module, and the overheat protection module comprises:

[0008] A conductive plate, the conductive plate is fixed inside the housing, one end of the conductive plate is connected to the pin, the pin extends out of the housing to connect to a power source, and the other end of the conductive plate is connected to the wire, and the conductive plate is electrically connected to an electrical device through the wire;

[0009] A thermal circuit breaker, the thermal circuit breaker is fixed on the surface of the conductive plate and is electrically connected to the pin and the wire respectively through the conductive plate;

[0010] A freewheeling resistor is fixed on the surface of the conductive plate and is electrically connected to the pin and the wire respectively through the conductive plate. The freewheeling resistor and the thermal circuit breaker are fixed on the same side of the conductive plate and connected in parallel through the conductive plate to ensure the circuit connection of the power plug when the thermal circuit breaker is disconnected.

[0011] In one implementation, an angle is formed between the thermal circuit breaker and the freewheeling resistor, and the angle is greater than or equal to 0° and less than or equal to 90°.

[0012] In one embodiment, the shell includes a first shell and a second shell that are snap-fitted together, and the first shell and the second shell are snap-fitted together to form the accommodating space to accommodate the overheat protection module.

[0013] In one embodiment, the first shell is arranged corresponding to one side of the conductive plate on which the thermal circuit breaker and the freewheeling resistor are fixed, and the second shell is arranged corresponding to the other side of the conductive plate. The inner cavities of the first shell and the second shell are arranged corresponding to the shape of the conductive plate, and the inner cavity depth of the first shell is greater than the inner cavity depth of the second shell.

[0014] In one embodiment, a first top protrusion is provided inside the first shell toward the conductive plate, the first top protrusion is arranged corresponding to the gap between the thermal circuit breaker and the freewheeling resistor, and the length of the first top protrusion is greater than the height of the thermal circuit breaker and the freewheeling resistor. When the first shell and the second shell are clamped together, the first top protrusion abuts against the conductive plate to prevent the first shell from squeezing the thermal circuit breaker and the freewheeling resistor.

[0015] In one embodiment, a second top protrusion is provided inside the second shell toward the conductive plate, and when the first shell and the second shell are clamped together, the second top protrusion abuts against the conductive plate to prevent the second shell from squeezing the conductive plate.

[0016] In one embodiment, one end of the first shell and the second shell is correspondingly provided with a clearance gap, so that the other end of the conductive plate can extend out of the shell and be connected to the wire when the first shell and the second shell are clamped together.

[0017] In one embodiment, the other ends of the first shell and the second shell are correspondingly provided with pin holes, so that the pins can be extended out of the shells when the first shell and the second shell are clamped together.

[0018] In one embodiment, the power plug further includes: an outer shell, the outer shell is injection molded on the outside of the shell, one end of the outer shell is flush with one end of the shell, the pin is extended from one end of the shell to connect to the power supply, and the other end of the outer shell wraps the wire, allowing the wire to extend from the other end of the outer shell to connect to the electrical device.

[0019] In one embodiment, the conductive plate is a printed circuit board, the thermal circuit breaker is a bimetallic circuit breaker, and the operating temperature of the thermal circuit breaker is 80°C-150°C.

[0020] The present invention discloses a power plug, comprising a shell, an overheat protection module, a pin and a wire, wherein a receiving space is formed inside the shell to receive the overheat protection module, and the overheat protection module comprises: a conductive plate, wherein the conductive plate is fixed inside the shell, one end of the conductive plate is connected to the pin, and the pin extends out of the shell to connect to a power source, and the other end of the conductive plate is connected to the wire, and the wire is electrically connected to an electrical device; a thermal circuit breaker, wherein the thermal circuit breaker is fixed on the surface of the conductive plate, and is electrically connected to the pin and the wire respectively through the conductive plate; and a freewheeling resistor, wherein the freewheeling resistor is fixed on the surface of the conductive plate, and is electrically connected to the pin and the wire respectively through the conductive plate, and the freewheeling resistor and the thermal circuit breaker are fixed on the same side of the conductive plate and are connected in parallel through the conductive plate, so as to ensure the circuit connection of the power plug when the thermal circuit breaker is disconnected. The present invention connects the pins and the wires respectively through a conductive plate, and a thermal circuit breaker and a freewheeling resistor are fixedly arranged on the same side of the conductive plate. This not only ensures that the power plug can still power the electrical appliance after the thermal circuit breaker is disconnected, but also reduces the volume required for the power plug. There is no need to set up a rigid shell to protect the thermal circuit breaker, so that the power plug is simple to process and compact in structure, and can be applied to different usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an exploded schematic diagram of the power plug of the present invention.

[0022] Figure 2 It is an exploded schematic diagram of another embodiment of the power plug of the present invention.

[0023] Figure 3 It is a three-dimensional schematic diagram of the shell of the power plug of the present invention accommodating the overheat protection module.

[0024] Figure 4 yes Figure 2 A schematic cross-sectional view of the power plug shown.

[0025] Figure 5 yes Figure 2A schematic cross-sectional view of the power plug from another angle is shown.

[0026] Figure 6 It is an exploded schematic diagram of the overheat protection module in the power plug of the present invention.

[0027] Figure 7 The invention discloses a schematic diagram of the connection between the overheat protection module, the plug pins and the wires in the power plug.

[0028] Figure 8 It is a three-dimensional schematic diagram of the first shell in the power plug of the present invention.

[0029] Fig. 9 It is a three-dimensional schematic diagram of the second shell in the power plug of the present invention.

[0030] Fig.10 It is a stereoscopic diagram of the power plug of the present invention.

[0031] Reference numerals:

[0032] 100-shell; 110-first shell; 111-first top protrusion; 120-second shell; 121-second top protrusion; 130-clearance gap; 140-pin hole; 200-overheating protection module; 210-conductive plate; 211-pin socket; 212-wire socket; 220-thermal circuit breaker; 230-freewheeling resistor; 300-pin; 400-wire; 410-wire protection cover; 500-outer shell. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “inside”, “outside”, “vertical” and “horizontal” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the structure referred to must have a specific direction or must be constructed in a specific direction, and should not be understood as a limitation on the present invention.

[0035] In addition, unless there is a special limitation on the articles in the text, "one" and "the" may refer to a single one or multiple ones. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. 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 the 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 invention.

[0036] Further, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] The invention discloses a power plug, such as Figure 1 and Figure 2 As shown, the power plug includes a housing 100 , an overheat protection module 200 , a plug pin 300 and a wire 400 .

[0038] Specifically, the housing 100 forms a receiving space inside to receive the overheat protection module 200. Figure 6 and Figure 7As shown, the overheat protection module 200 includes a conductive plate 210 , a thermal circuit breaker 220 and a freewheeling resistor 230 . The conductive plate 210 is fixed inside the housing 100, one end of the conductive plate 210 is connected to the pin 300, and extends out of the housing 100 to connect to the power supply through the pin 300, and the other end of the conductive plate 210 is connected to the wire 400, and is electrically connected to the electrical equipment through the wire 400; the thermal circuit breaker 220 is fixed on the surface of the conductive plate 210, and is electrically connected to the pin 300 and the wire 400 respectively through the conductive plate 210; the freewheeling resistor 230 is fixed on the surface of the conductive plate 210, and is electrically connected to the pin 300 and the wire 400 respectively through the conductive plate 210, and the freewheeling resistor 230 and the thermal circuit breaker 220 are fixed on the same side of the conductive plate 210 and connected in parallel through the conductive plate 210, so as to ensure the circuit connection of the power plug when the thermal circuit breaker 220 is disconnected. The present invention connects the pin 300 and the wire 400 respectively through the conductive plate 210, and the thermal circuit breaker 220 and the freewheeling resistor 230 connected in parallel are fixedly arranged on the same side of the conductive plate 210. In this way, under normal working conditions, the thermal circuit breaker 220 is turned on, the freewheeling resistor 230 is short-circuited, and the power plug is powered on; and after the thermal circuit breaker 220 is disconnected due to overheating, the freewheeling resistor 230 is connected in series with the pin 300 and the wire 400 through the conductive plate 210, and can continue to supply power to the electrical appliances in the electrical equipment. In this way, it is not only ensured that the power plug can still supply power to the electrical appliances after the thermal circuit breaker 220 is disconnected, but also the volume required for the power plug is reduced, and there is no need to set a rigid shell to protect the thermal circuit breaker 220 in order to provide the thermal circuit breaker 220 with a movement space, so that the power plug is simple to process and compact in structure, and can be applied to different usage scenarios.

[0039] Furthermore, an angle is formed between the thermal circuit breaker 220 and the freewheeling resistor 230, and the angle is greater than or equal to 0° and less than or equal to 90°. By setting the angle between the thermal circuit breaker 220 and the freewheeling resistor 230, the thermal circuit breaker 220 and the freewheeling resistor 230 provided on the conductive plate 210 can be made more compact, further reducing the volume required for the power plug.

[0040] Further, the housing 100 includes a first housing 110 and a second housing 120 connected by snap-fitting, and the first housing 110 and the second housing 120 are snap-fitted to form the accommodation space to accommodate the overheat protection module 200. The snap-fitting connection of the first housing 110 and the second housing 120 can quickly complete the assembly of the power plug, and can avoid the influence on the electronic components in the overheat protection module 200, thereby improving the product stability of the power plug. Optionally, the first housing 110 and the second housing 120 are injection-molded plastic housing structures, and the housing 100 is formed as a plastic part by snap-fitting. Optionally, the first housing 110 and the second housing 120 are formed by injection molding of polybutylene terephthalate (PBT) and glass fiber, and the housing 100 is formed by snap-fitting. Furthermore, by snap-fitting the first shell 110 and the second shell 120 to form an accommodating space to accommodate the overheat protection module 200, the rigid shell separately provided for the thermal circuit breaker 220 can be omitted, so that the thermal circuit breaker 220 directly contacts the air in the shell 100, making the heat transfer more direct and ensuring the thermal sensitivity of the thermal circuit breaker 220.

[0041] Further, the first shell 110 is arranged corresponding to the side of the conductive plate 210 where the thermal circuit breaker 220 and the freewheeling resistor 230 are fixed, and the second shell 120 is arranged corresponding to the other side of the conductive plate 210. The inner cavities of the first shell 110 and the second shell 120 are arranged corresponding to the shape of the conductive plate 210, and the inner cavity depth of the first shell 110 is greater than the inner cavity depth of the second shell 120. The inner cavities of the first shell 110 and the second shell 120 are combined to form a receiving space inside the shell 100 to accommodate the overheating protection module 200. Moreover, by setting the inner cavity depth of the first shell 110 to be greater than the inner cavity depth of the second shell 120, the first shell 110 is prevented from colliding with the thermal circuit breaker 220 and the freewheeling resistor 230, and the volume occupied by the side of the conductive plate 210 where the electronic device is not fixed is reduced, so that the structure of the overall power plug is more compact and the required volume is smaller, which is conducive to application in different scenarios. It should be noted that this is only one embodiment of the present invention. The second shell 120 may be arranged corresponding to the side of the conductive plate 210 on which the thermal circuit breaker 220 and the freewheeling resistor 230 are fixed, and the first shell 110 may be arranged corresponding to the other side of the conductive plate 210. In this case, the inner cavity depth of the first shell 110 is smaller, thereby further reducing the volume of the power plug.

[0042] Furthermore, a first top protrusion 111 is provided inside the first shell 110 toward the conductive plate 210, and the first top protrusion 111 is arranged corresponding to the gap between the thermal circuit breaker 220 and the freewheeling resistor 230, and the length of the first top protrusion 111 is greater than the height of the thermal circuit breaker 220 and the freewheeling resistor 230. When the first shell 110 and the second shell 120 are clamped together, the first top protrusion 111 abuts against the conductive plate 210 to avoid the first shell 110 squeezing the thermal circuit breaker 220 and the freewheeling resistor 230, thereby avoiding the shell 100 from being subjected to force to compress the thermal circuit breaker 220 or the freewheeling resistor 230 during the assembly process or use, avoiding affecting the circuit connection between the thermal circuit breaker 220 and the freewheeling resistor 230, and improving the assembly success rate and product stability.

[0043] Furthermore, the second shell 120 is provided with a second top protrusion 121 facing the conductive plate 210. When the first shell 110 and the second shell 120 are clamped together, the second top protrusion 121 abuts against the conductive plate 210 to prevent the second shell 120 from squeezing the conductive plate 210. This prevents the shell 100 from being subjected to force to compress the conductive plate 210 and deform the conductive plate 210 while ensuring that the volume occupied by the side of the conductive plate 210 where no electronic components are installed is reduced, thereby improving the assembly success rate and product stability.

[0044] Furthermore, one end of the first shell 110 and the second shell 120 is correspondingly provided with a clearance notch 130, so that the other end of the conductive plate 210 can be extended out of the shell 100 and connected to the wire 400 when the first shell 110 and the second shell 120 are clamped together. By setting the structure of the first shell 110 and the second shell 120, only the necessary part of the conductive plate 210 is exposed to connect with the wire 400, and no additional connection structure is required, so that the structure of the overall power plug is more compact, the required volume is smaller, and it is convenient for application in different scenarios.

[0045] Furthermore, the other ends of the first shell 110 and the second shell 120 are correspondingly provided with pin holes 140, so that the pins 300 can be extended out of the shell 100 when the first shell 110 and the second shell 120 are clamped together. The pins 300 extend out of the shell 100 after being connected to the conductive plate 210, which reduces the volume required for the shell 100, making the structure of the overall power plug more compact and requiring a smaller volume, which is beneficial for applications in different scenarios.

[0046] Furthermore, the power plug further includes: an outer shell 500, the outer shell 500 is injection molded on the outside of the shell 100 and wraps the shell 100, and one end of the outer shell 500 is flush with one end of the shell 100, so that the pin 300 extends from one end of the outer shell 500 to connect to the power supply; the other end of the outer shell 500 wraps the wire 400, so that the wire 400 extends from the other end of the outer shell 500 to connect to the electrical device. After the overheat protection module 200 is accommodated by the shell 100, the outer shell 500 can be directly manufactured by injection molding, thereby forming a complete external structure of the power plug, without the need to set up an additional rigid structure to protect the thermal circuit breaker 220, or to provide a movement space for the thermal circuit breaker 220, so that the manufacturing and assembly process of the power plug is simpler and faster. At the same time, one end of the outer shell 500 is flush with one end of the shell 100 from which the plug pin 300 extends, and the plug pin 300 directly extends from one end of the shell 100, thereby making the overall structure of the power plug more compact.

[0047] Furthermore, the conductive plate 210 is a printed circuit board, and the thermal circuit breaker 220, the freewheeling resistor and the wire 400 are fixedly connected to the conductive plate 210 through solder joints; the thermal circuit breaker 220 is a bimetallic circuit breaker, and when the temperature of the pin 300 is too high and the temperature transmitted to the thermal circuit breaker 220 reaches a preset temperature, the thermal circuit breaker 220 disconnects the contact to form a circuit breaker. Optionally, the operating temperature of the thermal circuit breaker is 80°C-150°C, and the preset temperature is the operating temperature of the thermal circuit breaker. At this time, the freewheeling resistor 230 maintains the series connection between the pin 300 and the wire 400 to continuously supply power to the electrical appliances in the electrical equipment, so as to complete safety procedures such as alarm of the electrical equipment after the power plug is overheated.

[0048] The present invention discloses a power plug, which provides overheat protection and power supply during overheat protection by arranging a thermal circuit breaker 220 and a freewheeling resistor 230 in parallel on the same side of a conductive plate 210, and also makes the structure of the overall power plug more compact. The present invention uses the conductive plate to fix the electronic components in the overheat protection module, and arranges the electronic components on the same side of the conductive plate, omitting an additional rigid protection structure, making the assembly process simpler, and the resulting power plug is small in size and good in stability, and can be applied to scenes of different sizes.

[0049] The structure of the power plug in one embodiment of the present invention is further described below with reference to the accompanying drawings.

[0050] like Figure 1 and Figure 2As shown, the power plug of the present invention comprises a housing 100, an overheat protection module 200, a pin 300, and a wire 400. The housing 100 encloses the overheat protection module 200 and the pin 300, and the pin 300 extends from one end of the housing 100 to connect to a power source, and the overheat protection module 200 extends from the other end of the housing 100 and connects to the wire 400 to connect to an electrical device.

[0051] Specifically, Figure 4 and Figure 6 As shown, the overheat protection module 200 includes a conductive plate 210, a thermal circuit breaker 220 and a freewheeling resistor 230, wherein the thermal circuit breaker 220 and the freewheeling resistor 230 are fixed on the same side of the conductive plate 210, thereby ensuring that only one side of the conductive plate 210 is provided with electronic devices, so as to reduce the volume required by the power plug on the side of the conductive plate 210 where no electronic devices are provided. Further, the conductive plate 210 is a printed circuit board (PCB), and a welding hole is provided on the conductive plate 210, and the thermal circuit breaker 220 and the freewheeling resistor 230 are welded and fixed on one side of the conductive plate 210 through the welding hole, and the welding point is on the other side of the conductive plate 210, thereby reducing the difficulty of processing and making the manufacturing process simpler and faster.

[0052] Furthermore, if Figure 1 and Figure 6As shown, one end of the conductive plate 210 is provided with a pin socket 211, and the pin 300 is welded and fixed to the one end of the conductive plate 210 through the pin socket 211; the other end of the conductive plate 210 is provided with a wire socket 212, and the wire 400 is welded and fixed to the conductive plate 210 through the wire socket 212 and electrically connected; at the same time, the thermal circuit breaker 220 and the freewheeling resistor 230 are arranged in parallel and then connected in series with the pin 300 and the wire 400 respectively. The thermal circuit breaker 220 is a bimetallic circuit breaker, so that when the power plug is working normally, the contacts of the thermal circuit breaker 220 are connected, the freewheeling resistor 230 is short-circuited by the thermal circuit breaker 220, and the pin 300 and the wire 400 are connected in series through the thermal circuit breaker 220 to form a circuit connection to supply power to the electrical equipment; when the power plug is overheated due to problems such as instantaneous excessive power or poor contact between the plug and the socket, the contacts of the thermal circuit breaker 220 are disconnected, and the thermal circuit breaker 220 is disconnected. At this time, the pin 300 and the wire 400 are connected in series through the freewheeling resistor 230 to form a circuit connection, but due to the existence of the freewheeling resistor 230, the circuit has a low current, which not only prevents the power plug from further heating up, but also can continuously supply power (milliampere level) to the electrical appliances in the electrical equipment, ensuring that the electrical equipment can complete functions such as alarm after a fault. Optionally, the operating temperature of the thermal circuit breaker is 80°C-150°C, that is, when the temperature of the power plug reaches the operating temperature, the thermal circuit breaker 220 is disconnected, and the freewheeling resistor 230 is connected in series with the pin 300 and the wire 400, which not only prevents the power plug from continuing to heat up, but also continues to supply power to the electrical appliances in the electrical equipment, ensuring that the electrical equipment completes functions such as alarm after a fault.

[0053] Furthermore, if Figure 2 and Figure 3 As shown, after the wire 400 and the pin 300 are connected to the conductive plate 210 respectively, the first shell 110 and the second shell 120 are snap-fitted together to form a shell 100 that wraps and accommodates the overheat protection module 200 and the pin 300, wherein one end of the pin 300 extends from one end of the shell 100 to connect to a power source, and the conductive plate 210 in the overheat protection module 200 is connected to one end of the wire 400 and extends from the other end of the shell 100, thereby reducing the volume required for the shell 100.

[0054] Specifically, Figure 8 and Fig. 9As shown, the inner cavity cross-sections of the first shell 110 and the second shell 120 match the shape of the conductive plate 210, so as to accommodate the conductive plate 210 in the accommodation space formed by the inner cavities of the first shell 110 and the second shell 120. Further, the inner cavity depth of the first shell 110 matches the maximum height of the thermal circuit breaker 220 and the freewheeling resistor 230 after being fixed on the conductive plate 210, so as to avoid the first shell 110 being pressed by force on the thermal circuit breaker 220 and the freewheeling resistor 230 during assembly and use, thereby further improving the stability of the power plug; and the inner cavity depth of the second shell 120 is less than the inner cavity depth of the first shell 110, thereby further reducing the volume of the shell 100 on the side of the conductive plate 210 where no electronic components are arranged, making the overall structure more compact.

[0055] Furthermore, if Figure 5 and Figure 8 As shown, a first top protrusion 111 is vertically provided on the inner side of the top of the first shell 110 toward the conductive plate 210, and the first top protrusion 111 is larger than the maximum height of the thermal circuit breaker 220 and the freewheeling resistor 230 after being fixed on the conductive plate 210. When the first shell 110 and the second shell 120 are clamped together, the first top protrusion 111 is against the conductive plate 210, so that during assembly or use, even if the first shell 110 is squeezed with force, it will not affect the circuit connection between the thermal circuit breaker 220 and the freewheeling resistor 230 and the conductive plate 210, so that the stability of the power plug is higher. Furthermore, the first top protrusion 111 is set corresponding to the gap between the thermal circuit breaker 220 and the freewheeling resistor 230, and forms a gap with the thermal circuit breaker 220 and the freewheeling resistor 230 respectively, so as to ensure that even if the power plug is shaken, no collision will occur between the thermal circuit breaker 220 and the freewheeling resistor 230, while reducing the electromagnetic interference between the thermal circuit breaker 220 and the freewheeling resistor 230, thereby further improving the product stability of the power plug.

[0056] Furthermore, if Figure 5 and Fig. 9 As shown, a second top protrusion 121 is vertically provided on the inner side of the top of the second shell 120 toward the conductive plate 210. When the first shell 110 and the second shell 120 are clamped together, the second top protrusion 121 is against the conductive plate 210. In this way, during assembly or use, even if the second shell 120 is squeezed with force, it will not affect the conductive plate 210, thereby preventing the conductive plate 210 from bending due to force and affecting the circuit connection between the thermal circuit breaker 220 and the freewheeling resistor 230 and the conductive plate 210.

[0057] Furthermore, if Figure 8 and Fig. 9 As shown, one end of the first shell 110 and the second shell 120 is provided with a clearance notch 130. When the first shell 110 and the second shell 120 are snapped together, the conductive plate 210 extends from the clearance notch 130 and is connected to the wire 400. This avoids accommodating the wire 400 in the shell 100, thereby further reducing the volume of the shell 100, making the structure of the power plug more compact and smaller, which is conducive to the application in different size scenes. Optionally, a wire protection sleeve 410 is provided at the connection between the wire 400 and the conductive plate 210 to wrap the connection between the wire 400 and the conductive plate 210, so as to avoid the wire 400 from falling off the conductive plate 210 during use, thereby improving the product quality and use stability of the power plug. Optionally, the wire protection cover 410 is formed by one-time PVC overmolding to wrap the connection between the wire 400 and the conductive plate 210 to prevent the wire 400 from falling off the conductive plate 210 during use, thereby making the power plug stronger and more durable.

[0058] Furthermore, if Figure 8 and Fig. 9 As shown, the other end of the first shell 110 and the second shell 120 is provided with a pin hole 140. When the first shell 110 and the second shell 120 are snapped together, the pin 300 extends from the pin hole 140 to connect to the power supply. In this way, the volume of the pin 300 contained in the shell 100 is minimized, thereby further reducing the volume of the shell 100, making the structure of the power plug more compact and smaller, which is conducive to the application in different size scenes. Optionally, the pin hole 140 is set with different numbers and shapes corresponding to different pin numbers and pin shapes to form a power plug matching different specifications and different models.

[0059] Furthermore, if Figure 4 and Fig.10As shown, after the shell 100 is assembled, an outer shell 500 is formed by injection molding outside the shell 100, one end of the outer shell 500 is flush with one end of the shell 100, and the other end wraps the shell 100 to form the overall outer contour of the power plug. At this time, the pin 300 extends from the end of the shell 100 that is flush with the outer shell 500 to connect to the power supply, and the wire 400 extends from the other end of the outer shell 500 to connect to the electrical device. Optionally, the outer shell 100 is a shell structure formed by injection molding of PVC soft glue, and the power plug is encapsulated by the outer shell 500, thereby further improving the stability of the product, and the process is simple, which is convenient for assembly line operation. At the same time, due to the presence of the shell 100, the power plug does not need to be provided with an additional rigid structure to protect the thermal circuit breaker 220 or provide an operating space for the thermal circuit breaker 220. The volume of the outer shell 500 can be smaller, thereby ensuring that the volume of the power plug is smaller. The power plug can still provide power for the electrical appliance after achieving overheat protection, and the processing is simple, the structure is compact, and it can be applied to different usage scenarios.

[0060] In summary, the present invention discloses a power plug, comprising a shell, an overheating protection module, a pin and a wire, wherein a housing space is formed inside the shell to accommodate the overheating protection module, and the overheating protection module comprises: a conductive plate, wherein the conductive plate is fixed inside the shell, one end of the conductive plate is connected to the pin, and extends out of the shell through the pin to connect to the power supply, and the other end of the conductive plate is connected to the wire, and is electrically connected to the electrical equipment through the wire; a thermal circuit breaker, wherein the thermal circuit breaker is fixed on the surface of the conductive plate, and is electrically connected to the pin and the wire respectively through the conductive plate; and a freewheeling resistor, wherein the freewheeling resistor is fixed on the surface of the conductive plate, and is electrically connected to the pin and the wire respectively through the conductive plate, and the freewheeling resistor and the thermal circuit breaker are fixed on the same side of the conductive plate and are connected in parallel through the conductive plate, so as to ensure the circuit connection of the power plug when the thermal circuit breaker is disconnected. The present invention connects the pins and the wires respectively through a conductive plate, and a thermal circuit breaker and a freewheeling resistor are fixedly arranged on the same side of the conductive plate. This not only ensures that the power plug can still power the electrical appliance after the thermal circuit breaker is disconnected, but also reduces the volume required for the power plug. There is no need to set up a rigid shell to protect the thermal circuit breaker, so that the power plug is simple to process and compact in structure, and can be applied to different usage scenarios.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power plug, characterized in that: The invention comprises a housing, an overheat protection module, a pin and a wire, wherein a receiving space is formed inside the housing to receive the overheat protection module, and the overheat protection module comprises: A conductive plate, the conductive plate is fixed inside the housing, one end of the conductive plate is connected to the pin, the pin extends out of the housing to connect to a power source, and the other end of the conductive plate is connected to the wire, and the conductive plate is electrically connected to an electrical device through the wire; A thermal circuit breaker, the thermal circuit breaker is fixed on the surface of the conductive plate and is electrically connected to the pin and the wire respectively through the conductive plate; A freewheeling resistor is fixed on the surface of the conductive plate and is electrically connected to the pin and the wire respectively through the conductive plate. The freewheeling resistor and the thermal circuit breaker are fixed on the same side of the conductive plate and connected in parallel through the conductive plate to ensure the circuit connection of the power plug when the thermal circuit breaker is disconnected.

2. The power plug according to claim 1, characterized in that: An angle is formed between the thermal circuit breaker and the freewheeling resistor, and the angle is greater than or equal to 0° and less than or equal to 90°.

3. The power plug according to claim 1, characterized in that: The housing comprises a first housing and a second housing connected by snap-fitting, and the accommodation space is formed by snap-fitting the first housing and the second housing to accommodate the overheat protection module.

4. The power plug according to claim 3, characterized in that: The first shell is arranged corresponding to one side of the conductive plate on which the thermal circuit breaker and the freewheeling resistor are fixed, and the second shell is arranged corresponding to the other side of the conductive plate. The inner cavities of the first shell and the second shell are arranged corresponding to the shape of the conductive plate, and the inner cavity depth of the first shell is greater than the inner cavity depth of the second shell.

5. The power plug according to claim 4, characterized in that: A first top protrusion is provided inside the first shell toward the conductive plate, the first top protrusion is provided corresponding to the gap between the thermal circuit breaker and the freewheeling resistor, and the length of the first top protrusion is greater than the height of the thermal circuit breaker and the freewheeling resistor. When the first shell and the second shell are clamped together, the first top protrusion abuts against the conductive plate to prevent the first shell from squeezing the thermal circuit breaker and the freewheeling resistor.

6. The power plug according to claim 5, characterized in that: A second top protrusion is disposed inside the second shell toward the conductive plate. When the first shell and the second shell are clamped together, the second top protrusion abuts against the conductive plate to prevent the second shell from squeezing the conductive plate.

7. The power plug according to claim 3, characterized in that: One end of the first shell and the second shell is correspondingly provided with a clearance notch, so that the other end of the conductive plate can extend out of the shell and be connected with the wire when the first shell and the second shell are clamped together.

8. The power plug according to claim 7, characterized in that: The other ends of the first shell and the second shell are correspondingly provided with pin holes, so that the pins can be extended out of the shells when the first shell and the second shell are clamped together.

9. The power plug according to claim 1, characterized in that: The power plug also includes: an outer shell, which is injection molded on the outside of the shell, one end of the outer shell is flush with one end of the shell, allowing the pin to extend from one end of the shell to connect to the power supply, and the other end of the outer shell wraps the wire, allowing the wire to extend from the other end of the outer shell to connect to the electrical device.

10. The power plug according to any one of claims 1 to 9, characterized in that: The conductive plate is a printed circuit board, the thermal circuit breaker is a bimetallic circuit breaker, and the operating temperature of the thermal circuit breaker is 80°C-150°C.

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