Multi-protection cigarette lighter electricity taking module

Abstract

The utility model relates to the technical field of vehicle accessories, in particular to a multi-protection cigarette lighter electricity taking module which comprises a cigarette lighter and an electricity taking module, the electricity taking module comprises a cathode assembly and an anode assembly, the cathode assembly comprises a metal inner cylinder, the metal inner cylinder is connected with the cigarette lighter in a sleeved mode, and the metal inner cylinder is connected with a cathode of the cigarette lighter. The positive electrode assembly comprises a bimetallic strip and a protection sheet, the bimetallic strip and the protection sheet are both located in the metal inner cylinder, the bimetallic strip is connected with the positive electrode of the cigarette lighter, when the temperature of the cigarette lighter is too high, the bimetallic strip expands and is disconnected with the positive electrode of the cigarette lighter, the protection sheet is connected with the bimetallic strip, and when the cigarette lighter is overloaded or the temperature is too high, the bimetallic strip is disconnected with the positive electrode of the cigarette lighter. According to the utility model, different protection elements are arranged for cooperative work, and through effective effects of the different protection elements under different abnormal conditions, circuit damage and potential safety hazards are reduced to a great extent, and the safety and reliability of the circuit of the cigarette lighter are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle accessories, in particular to a multi-protection cigarette lighter power module. Background Art

[0002] The cigarette lighter, a ubiquitous device in modern cars, was originally designed to accommodate passengers' in-car smoking needs. It works by utilizing the vehicle's own power system to provide the required power. Typically, the cigarette lighter is connected to the vehicle's power system via a plug-in connector. During operation, the metal portion of the lighter's outer surface contacts the inner tube, completing an electrical circuit. The heater at the bottom of the lighter contacts the metal plate. When current flows through this circuit, it heats the resistor wire inside the lighter, rapidly raising its temperature to a level high enough to ignite a cigarette. Once the resistor wire reaches a preset temperature, the high temperature automatically disconnects the metal plate from the heater, halting the heating process.

[0003] However, cigarette lighter sockets typically operate at high voltage and power, which poses certain risks during use. Improper use can damage the device and even pose safety risks. For example, if the metal plate malfunctions and fails to properly disconnect the circuit, the resistor wire will continue to heat, causing it to overheat. This high temperature could ignite surrounding combustible materials and even cause a fire, resulting in serious consequences. Furthermore, prolonged exposure to high temperatures can not only damage the cigarette lighter itself, shortening its lifespan, but can also harm other components within the vehicle.

[0004] The utility model patent application number CN201920729822.1 specifically discloses a dual-purpose cigarette lighter structure with a protective function for both lighting and drawing electricity. The structure includes a handle, a sliding sleeve, a mounting ring, an inner cylinder, a negative pole adapter post, a ceramic shield, a conductive plate, a resistance heating wire, a negative pole plug, an insulating gasket, a PTC thermistor protection sheet, a positive pole plug, a positive pole wire pressure sheet, a negative pole connecting post, a negative pole connection post, a bolt post, a wiring insulating post, a power connection wire, an LED lamp bead, a spring, a bimetallic sheet, a pressure plate, a push rod, a guide rod, a vertical rod, an insulating baffle, a bushing, and a power connection spring. Two layers of new thermally sensitive material with a protective function are added between the positive and negative poles of the cigarette lighter. The first layer is a PTC thermistor protection sheet. When the socket is drawing electricity, it prevents the socket from overheating and causing safety accidents. When the temperature rises, the resistance of the protection sheet increases, thereby activating the circuit breaker protection function.

[0005] Therefore, there is an urgent need for a multi-protection cigarette lighter power module that can effectively prevent and reduce the occurrence of the above-mentioned dangerous situations through built-in short-circuit protection and overheating protection mechanisms. Through these protection measures, the safe and stable operation of the vehicle circuit can be ensured, thereby providing a safer and more reliable riding environment for drivers and passengers. Utility Model Content

[0006] In response to existing technical problems, the present invention aims to provide a multi-protection cigarette lighter power module. The present invention realizes the protection of the cigarette lighter circuit by integrating a bimetallic strip, a thermistor protection strip and a protection strip. The three protection elements, namely the bimetallic strip, the thermistor protection strip and the protection strip, work together. The bimetallic strip achieves protection by deforming and disconnecting the circuit when the temperature rises to a certain level. The thermistor protection strip focuses on preventing overheating by limiting the current when the socket temperature rises abnormally. The protection strip provides short-circuit protection when the cigarette lighter is overloaded or the temperature is too high. Regardless of the reason for the circuit problem of the cigarette lighter, such as long-term use, overload, abnormal socket temperature, etc., the corresponding protection measures can be activated in time, which greatly reduces circuit damage and safety hazards, and improves the safety and reliability of the cigarette lighter circuit.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A multi-protection cigarette lighter power module, comprising:

[0009] Cigarette lighter and power module;

[0010] The power taking module includes a negative electrode component and a positive electrode component, and the negative electrode component and the positive electrode component are respectively connected to the positive and negative electrodes of the vehicle power supply;

[0011] The negative electrode assembly includes a negative electrode contact and a metal inner tube, the negative electrode contact is connected to the metal inner tube, the negative electrode contact is connected to the negative electrode of the vehicle power supply, the metal inner tube is sleeved with the cigarette lighter, and the metal inner tube is connected to the negative electrode of the cigarette lighter;

[0012] The positive electrode assembly includes a positive electrode contact and a bimetallic strip, the positive electrode contact is connected to the bimetallic strip, and the positive electrode contact is connected to the positive electrode of the vehicle power supply. The bimetallic strip is located in the metal inner tube. When the cigarette lighter is inserted into the metal inner tube, the bimetallic strip is squeezed and connected to the positive electrode of the cigarette lighter. When the temperature of the cigarette lighter is too high, the bimetallic strip expands and disconnects from the positive electrode of the cigarette lighter.

[0013] The positive electrode assembly also includes a protective sheet, which is arranged in the metal inner tube and connected to the bimetallic sheet. When the cigarette lighter is overloaded or the temperature is too high, the protective sheet expands due to heat and collides with the metal inner tube, forming a short circuit.

[0014] As an improvement, the cigarette lighter includes a pressing head, a connecting sleeve and a heater. The pressing head outer shell is provided with the connecting sleeve, the bottom of the connecting sleeve is connected to the heater, the connecting sleeve outer shell is provided with a protective cover, a spring is provided between the connecting sleeve and the protective cover, the two ends of the spring are respectively arranged to contact the connecting sleeve and the protective cover, a porcelain column is provided between the connecting sleeve and the heater, and the porcelain column is sleeved on the heater.

[0015] As an improvement, the heater includes a heating wire, a heating wire cover, a mica gasket and a clamping pile. The heating wire is arranged in the heating wire cover, the mica gasket is arranged between the heating wire and the heating wire cover, the clamping pile is fixedly connected to the heating wire cover, and the heating wire cover is connected to the connecting sleeve through the clamping pile.

[0016] As an improvement, a positioning groove is provided on the side wall of the metal inner tube corresponding to the bimetallic strip, and the positioning groove fits with the protrusion on the edge of the bimetallic strip. The positioning groove provides free space when the bimetallic strip is heated and expanded. A card slot is also provided on the side wall of the metal inner tube, and the card slot limits the installation position of the metal inner tube on the mounting seat.

[0017] As an improvement, the power supply module also includes rivets, a porcelain seat and a positioning seat. The rivets are sequentially passed through the porcelain seat, the metal inner tube and the positioning seat. The porcelain seat is arranged in the metal inner tube. The negative electrode contact and the positive electrode contact are crimped onto the positioning seat through the rivets.

[0018] As an improvement, the bimetallic strip is arranged between the rivet and the porcelain seat, the bimetallic strip is installed on the side of the porcelain seat close to the cigarette lighter, the bimetallic strip extends from one side of the porcelain seat toward the cigarette lighter, and the extended end of the bimetallic strip is contoured with the side wall of the cigarette lighter.

[0019] As an improvement, an elastic gasket is provided between the negative electrode contact and the positive electrode contact, and two ends of the elastic gasket are respectively disposed in contact with the negative electrode contact and the positive electrode contact.

[0020] As an improvement, a thermistor protection sheet is provided between the negative electrode tab and the metal inner tube. When the temperature between the negative electrode tab and the positive electrode tab rises, the resistance of the thermistor protection sheet increases, thereby disconnecting the metal inner tube from the negative electrode tab.

[0021] As an improvement, the temperature at which the protective sheet is triggered is T1, the temperature at which the bimetallic strip is triggered is T2, and the normal operating temperature of the heater is T3, satisfying the relationship: T1>T2>T3.

[0022] As an improvement, a contact is provided at one end of the protective sheet extending outward. When the cigarette lighter is overloaded and the temperature is too high, the protective sheet expands due to the heat, and the contact is affected by the protective sheet and contacts the inner wall of the metal inner tube, so that the positive and negative circuits are connected, causing a short circuit and thus disconnecting the circuit.

[0023] The beneficial effects of the present invention are:

[0024] (1) The utility model realizes comprehensive protection of the cigarette lighter circuit by integrating a bimetallic strip, a thermistor protection strip and a protection strip. The three protection elements, the bimetallic strip, the thermistor protection strip and the protection strip, work together. The bimetallic strip disconnects the circuit by deformation when the temperature rises to a certain level to achieve protection. The thermistor protection strip focuses on preventing overheating by limiting the current when the socket temperature rises abnormally. The protection strip provides short-circuit protection when the cigarette lighter is overloaded or the temperature is too high. Regardless of the reasons for the problem of the cigarette lighter circuit, such as long-term use, overload, abnormal socket temperature, etc., the corresponding protection measures can be activated in time, which greatly reduces circuit damage and safety hazards, and improves the safety and reliability of the cigarette lighter circuit.

[0025] (2) In the present invention, when the temperature between the positive and negative terminals of the cigarette lighter exceeds a preset value due to various abnormal conditions, the thermistor protection sheet can react quickly and accurately, increase resistance, disconnect the elastic gasket from the negative terminal, and realize the protection function of stopping heating. After the temperature returns to normal, the thermistor protection sheet can return to its original state. Secondly, the thermistor protection sheet will not be easily damaged within the normal operating temperature range and can still maintain normal function after multiple protection actions, reducing the trouble of frequent replacement of protection components.

[0026] (3) In the present invention, rivets connect the power connection part and the metal inner cylinder, and the positioning seat limits the positive and negative electrode contacts to ensure that they are in stable position during use. The positive and negative electrode contacts are respectively connected to the positive and negative poles of the vehicle power supply. The elastic gasket is arranged between the two. In the case of vehicle vibration, it can compensate for dimensional tolerances, provide elastic support, and buffer mechanical stress, ensuring good contact between the positive and negative electrode contacts and other components, maintaining a stable power connection, and preventing circuit problems caused by poor contact;

[0027] (4) In the present invention, the temperature T1 that triggers the operation of the protective plate and the temperature T2 that triggers the operation of the bimetallic strip are both higher than the normal operating temperature T3 of the heater. This temperature setting relationship ensures that the protective plate and the bimetallic strip will not malfunction within the normal operating range of the heater. When the heater is abnormally high in temperature or overloaded, the protective plate and the bimetallic strip can activate the protection circuit in time to ensure the safe and stable operation of the cigarette lighter and avoid the impact on normal use and equipment safety caused by the protection mechanism being activated too early or too late.

[0028] In summary, the present invention has the advantages of multiple protection mechanisms, stable power connection, durable protection components, etc., and is particularly suitable for the field of automotive accessories technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the cigarette lighter of the present utility model;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the cigarette lighter of the present utility model;

[0031] Figure 3 This is a schematic diagram of the cross-sectional structure of the cigarette lighter of the present invention;

[0032] Figure 4 This is a schematic diagram of the internal structure of the heater of the utility model;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the power taking module of the utility model;

[0034] Figure 6 This is a schematic diagram of the cross-sectional structure of the power supply module of the utility model Figure 1 ;

[0035] Figure 7 This is a schematic diagram of the cross-sectional structure of the power supply module of the utility model Figure 2 ;

[0036] Figure 8 This is the circuit principle diagram of the power taking module of this utility model.

[0037] In the figure: cigarette lighter 1, pressing head 11, connecting sleeve 12, heater 13, heating wire 131, heating wire cover 132, mica gasket 133, clamping pile 134, protective cover 14, spring 15, porcelain column 16, power taking module 2, negative electrode assembly 21, negative electrode contact 210, metal inner cylinder 211, positioning groove 2111, card slot 2112, thermistor protection sheet 212, positive electrode assembly 22, positive electrode contact 220, bimetallic strip 221, protection sheet 222, contact 2221, rivet 23, porcelain seat 24, positioning seat 25, elastic gasket 26. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0041] Example:

[0042] like Figures 1-8 As shown, a multi-protection cigarette lighter power module includes:

[0043] Cigarette lighter 1 and power module 2;

[0044] The power taking module 2 includes a negative electrode component 21 and a positive electrode component 22, and the negative electrode component 21 and the positive electrode component 22 are connected to the positive and negative electrodes of the vehicle power supply respectively;

[0045] The negative electrode assembly 21 includes a negative electrode contact 210 and a metal inner tube 211. The negative electrode contact 210 is connected to the metal inner tube 211, and the negative electrode contact 210 is connected to the negative electrode of the vehicle power supply. The metal inner tube 211 is sleeved with the cigarette lighter 1 and connected to the negative electrode of the cigarette lighter 1.

[0046] The positive electrode assembly 22 includes a positive electrode contact 220 and a bimetallic strip 221. The positive electrode contact 220 is connected to the bimetallic strip 221. The positive electrode contact 220 is connected to the positive electrode of the vehicle power supply. The bimetallic strip 221 is located in the metal inner tube 211. When the cigarette lighter 1 is inserted into the metal inner tube 211, the bimetallic strip 221 is squeezed. The bimetallic strip 221 is connected to the positive electrode of the cigarette lighter 1. When the temperature of the cigarette lighter 1 is too high, the bimetallic strip 221 expands and changes The bimetallic strip 221 is deformed and disconnected from the positive electrode of the cigarette lighter 1. Once the cigarette lighter 1 is overheated due to prolonged use or other reasons, the bimetallic strip 221 will expand and deform due to its own thermal expansion characteristics. As the temperature rises, the degree of deformation will gradually increase until the connection with the positive electrode of the cigarette lighter 1 is disconnected, thereby promptly cutting off the power supply circuit of the cigarette lighter 1 and stopping the heating. This effectively prevents the cigarette lighter 1 from overheating and causing safety hazards such as fire, damage to itself or other on-board equipment, and ensures the safety of the vehicle and its occupants.

[0047] The positive electrode assembly 22 also includes a protective sheet 222, which is arranged in the metal inner tube 211 and is connected to the bimetallic sheet 221. When the cigarette lighter 1 is overloaded or the temperature is too high, the protective sheet 222 expands due to heat and collides with the metal inner tube 211, forming a short circuit. The protective sheet 222 and the bimetallic sheet 221 cooperate with each other in the protection mechanism. The bimetallic sheet 221 mainly focuses on stopping the power supply by disconnecting the connection with the positive electrode of the cigarette lighter 1 when the temperature of the cigarette lighter 1 is too high, thereby providing a more precise temperature control protection function. The protective sheet 222 more thoroughly cuts off the power supply path of the cigarette lighter 1 by forming a short circuit when the cigarette lighter 1 is overloaded or the temperature is too high to a certain extent, thereby achieving multiple protections.

[0048] It should be noted that when the cigarette lighter 1 is overloaded, it may cause excessive current, thereby causing the temperature of the entire power supply module 2 and related components to rise. Similarly, when the temperature of the cigarette lighter 1 itself is too high, not only will the bimetallic strip 221 expand and deform due to the heat to disconnect from the positive pole of the cigarette lighter 1 to provide initial protection, but the protective strip 222 will also begin to expand due to absorbing heat. As the heat continues to accumulate, the expansion degree of the protective strip 222 continues to increase until it conflicts with the inner wall of the metal inner tube 211. Since the metal inner tube 211 is connected to the negative pole of the cigarette lighter 1 in the circuit design, the conflict between the protective strip 222 and the metal inner tube 211 forms a short circuit state, causing the current to quickly pass through the path formed by the connection between the protective strip 222 and the metal inner tube 211, thereby cutting off the normal power supply circuit of the cigarette lighter 1, further preventing serious safety hazards such as fire and damage to vehicle-mounted equipment caused by overload or high temperature.

[0049] Among them, the cigarette lighter 1 includes a pressing head 11, a connecting sleeve 12 and a heater 13. The connecting sleeve 12 is provided on the outer jacket of the pressing head 11. The heater 13 is connected to the bottom of the connecting sleeve 12. The connecting sleeve 12 is provided with a protective cover 14. The protective cover 14 mainly plays a protective role to prevent the user from accidentally touching the heater 13 and getting burned when operating the cigarette lighter 1. A spring 15 is provided between the connecting sleeve 12 and the protective cover 14. The two ends of the spring 15 are respectively in contact with the connecting sleeve 12 and the protective cover 14. The spring 15 plays a reset and buffering role in the structure of the cigarette lighter 1. When the pressing head 11 is pressed, the connecting sleeve 12 will move downward to compress the spring 15. When the bimetallic strip 221 When the spring 15 is deformed by heat and disconnected from the cigarette lighter 1, it will rely on its own elasticity to restore its original shape and push the connecting sleeve 12 to move upward and back to the initial position. A porcelain column 16 is provided between the connecting sleeve 12 and the heater 13. The porcelain column 16 is sleeved on the heater 13. The porcelain column 16 mainly plays the role of insulation and support. It is made of ceramic material with high insulation, high temperature resistance and good mechanical properties. The porcelain column 16 is sleeved on the heater 13. On the one hand, it can prevent the heater 13 from directly contacting the connecting sleeve 12 and causing a short circuit, ensuring that the current can only be transmitted through the heating wire of the heater 13. On the other hand, it can also play a certain supporting role on the heater 13, so that it maintains a stable position in the structure of the cigarette lighter 1.

[0050] Furthermore, the heater 13 includes a heating wire 131, a heating wire cover 132, a mica gasket 133 and a clamping pile 134. The heating wire 131 is arranged in the heating wire cover 132, and the mica gasket 133 is arranged between the heating wire 131 and the heating wire cover 132. The mica gasket 133 can prevent the heating wire 131 from directly contacting the heating wire cover 132 during the heating process and causing a short circuit, ensuring that the current can only be conducted through the path of the heating wire 131 itself, thereby ensuring electrical safety. Secondly, it blocks the transfer of heat to a certain extent, reduces the heat generated by the heating wire 131 from being dissipated too quickly to the heating wire cover 132 and other components, helps to maintain the high temperature state of the heating wire 131, and improves the heating efficiency. The clamping pile 134 is fixedly connected to the heating wire cover 132, and the heating wire cover 132 is connected to the connecting sleeve 12 through the clamping pile 134. The clamping pile 134 is fixedly connected to the heating wire cover 132.

[0051] In addition, a positioning groove 2111 is formed on the side wall of the metal inner tube 211, corresponding to the bimetallic strip 221. The positioning groove 2111 mates with a protrusion on the edge of the bimetallic strip 221. The positioning groove 2111 provides space when the bimetallic strip 221 is heated and expanded. When the bimetallic strip 221 is heated and expanded and deformed due to the high temperature of the cigarette lighter 1, the positioning groove 2111 provides the necessary expansion space for the bimetallic strip 221 to expand and deform, thereby preventing the bimetallic strip 221 from being excessively restricted during expansion, thereby damaging itself or affecting its protective function of disconnecting from the positive terminal of the cigarette lighter 1.

[0052] A slot 2112 is further provided on the side wall of the metal inner tube 211. The slot 2112 limits the installation position of the metal inner tube 211 on the mounting seat. By limiting the installation position of the metal inner tube 211, the slot 2112 indirectly ensures the accuracy of the relative position relationship between the negative electrode assembly 21, the positive electrode assembly 22 and the cigarette lighter 1 connected thereto, which helps to maintain a stable electrical connection, ensures that the cigarette lighter 1 can normally draw power and generate heat, and also ensures the normal functioning of related functions such as overheating protection, thereby improving the reliability and safety of the entire system.

[0053] Furthermore, the power supply module 2 also includes a rivet 23, a porcelain seat 24 and a positioning seat 25. The rivet 23 is sequentially passed through the porcelain seat 24, the metal inner tube 211 and the positioning seat 25. The through-type connection method enables each component to be tightly fixed together in the axial direction, providing structural stability for the entire power supply module 2. The porcelain seat 24 is arranged in the metal inner tube 211, and the negative electrode contact 210 and the positive electrode contact 220 are crimped onto the positioning seat 25 through the rivet 23. The porcelain seat 24 plays the role of insulation and structural stability to prevent electrical failures and loose components. The positioning seat 25 provides accurate positioning and stable support for the negative electrode contact 210 and the positive electrode contact 220, thereby improving the efficiency and stability of current transmission.

[0054] Furthermore, the bimetallic strip 221 is arranged between the rivet 23 and the porcelain seat 24, and the bimetallic strip 221 is installed on the side of the porcelain seat 24 close to the cigarette lighter 1. The bimetallic strip 221 extends from one side of the porcelain seat 24 toward the cigarette lighter 1, and the extended end of the bimetallic strip 221 is contoured with the side wall of the cigarette lighter 1, so that the bimetallic strip 221 can achieve a better contact effect when in contact with the cigarette lighter 1. On the one hand, the closely contacted bimetallic strip 221 can ensure that under normal working conditions, the current can be smoothly transmitted from the bimetallic strip 221 to the cigarette lighter 1, ensuring the normal heating operation of the cigarette lighter 1 and improving the efficiency and reliability of the electrical connection. On the other hand, when the temperature of the cigarette lighter 1 rises, this close and comprehensive contact enables the bimetallic strip 221 to sense the temperature change more accurately, thereby exerting its overheating protection function more timely and effectively.

[0055] It should be noted that the ceramic seat 24, as a component with high insulation, can effectively isolate the bimetallic strip 221 from any conductive components that may exist in the surrounding area, prevent unnecessary electrical short circuits under normal or abnormal conditions, and ensure the electrical safety of the entire power supply module 2 and related circuits. Secondly, the rivet 23 provides a certain structural support and stability for the bimetallic strip 221, so that the bimetallic strip 221 can exist relatively firmly in this position, reducing the possibility of its position displacement or loosening due to factors such as vehicle driving vibration.

[0056] In addition, an elastic gasket 26 is provided between the negative electrode contact 210 and the positive electrode contact 220. The two ends of the elastic gasket 26 are respectively arranged to contact the negative electrode contact 210 and the positive electrode contact 220. When the negative electrode contact and the positive electrode contact are connected and installed, the elastic gasket 26 absorbs part of the pressure to prevent the negative electrode contact and the positive electrode contact from being deformed due to excessive extrusion, such as preventing local dents, warping, etc.

[0057] In addition, the presence of the elastic gasket 26 also improves the stability and durability of the connection. During the operation of the vehicle, vibration and impact will be generated due to uneven roads or sudden braking. The elastic gasket 26 can absorb these external forces and reduce the direct impact on the docking piece, thereby extending the service life of the power supply module. The elastic gasket 26 uses insulating materials to ensure the safety of the entire circuit and avoid the risk of short circuit caused by the conductivity of the gasket material.

[0058] Furthermore, a thermistor protection sheet 212 is provided between the negative electrode contact 210 and the metal inner tube 211. When the temperature between the negative electrode contact 210 and the positive electrode contact 220 rises, the resistance of the thermistor protection sheet 212 increases, thereby disconnecting the metal inner tube 211 from the negative electrode contact 210. When the circuit temperature rises abnormally due to overload or short circuit, the thermistor protection sheet 212 can respond quickly and limit the flow of current by increasing resistance, thereby protecting the circuit from damage. Moreover, due to the connection of the thermistor protection sheet 212, the circuit can automatically restore the connection after returning to normal temperature without manual intervention, thereby improving the convenience and safety of the power extraction module. In addition, the connection design between the metal inner tube 211 and the negative electrode contact 210 ensures the efficiency and stability of current transmission.

[0059] Furthermore, the temperature at which the protective sheet 222 is triggered is T1, the temperature at which the bimetallic strip 221 is triggered is T2, and the normal operating temperature of the heater 13 is T3, satisfying the relationship: T1>T2>T3. The normal operating temperature T3 of the heater 13 refers to the temperature range that the heater 13 needs to maintain in order to achieve the cigarette lighter function during the normal operation of the cigarette lighter. The triggering temperature T2 of the bimetallic strip 221 is the temperature threshold at which the bimetallic strip 221 begins to play its protective role when the temperature of the heater 13 rises to a certain level, which may pose a threat to the safety of the heater 13 itself or the entire cigarette lighter system. Since the bimetallic strip 221 is based on the thermal expansion caused by temperature changes, the temperature at which the bimetallic strip 221 begins to play its protective role is T1. When the temperature of the heater 13 reaches T2, the bimetallic strip 221 will be deformed by thermal expansion and disconnected from the positive electrode of the cigarette lighter 1, thereby cutting off the power supply circuit of the heater 13, preventing it from continuing to heat up, and avoiding safety hazards such as fire, damage to the heater 13 itself or other vehicle-mounted equipment caused by overheating. When the temperature of the heater 13 continues to rise due to a malfunction of the bimetallic strip 221 and the inability to effectively cut off the circuit, or encountering a more serious overload situation, the temperature will continue to rise. When it reaches T1, the protective sheet 222 will be connected, and by forming a short circuit, it is ensured that the power supply circuit of the cigarette lighter 1 is completely cut off, avoiding possible serious safety accidents.

[0060] This layered protection mechanism greatly enhances the safety of the cigarette lighter system. By setting different trigger temperature thresholds, corresponding protection measures can be activated in time under different degrees of temperature abnormalities. It can not only effectively prevent false protection caused by fluctuations in the normal operating temperature of the heater 13, but also provide reliable protection measures to ensure the safety of the entire system when facing various possible fault conditions, thereby reducing the probability of safety accidents such as fire caused by overheating of the cigarette lighter and damage to vehicle-mounted equipment.

[0061] It should be noted that a contact 2221 is provided at one end of the protective sheet 222 extending outward. When the cigarette lighter 1 is overloaded and the temperature is too high, the protective sheet 222 expands due to the heat, and the contact 2221 is affected by the protective sheet 222 and contacts the inner wall of the metal inner tube 211, so that the positive and negative circuits are connected, causing a short circuit and thus disconnecting the circuit. When the cigarette lighter 1 is overloaded and the temperature is too high, the protective sheet 222 will expand due to absorbing a large amount of heat. Since the contact 2221 is provided on the protective sheet 22 2, the expansion of the protective sheet 222 will directly push the contact 2221 toward the inner wall of the metal inner tube 211. As the protective sheet 222 continues to expand, the contact 2221 will eventually come into contact with the inner wall of the metal inner tube 211. At this time, because the metal inner tube 211 is connected to the negative electrode of the cigarette lighter 1 in the circuit, and the protective sheet 222 where the contact 2221 is located is connected to the positive electrode assembly and other related components, the positive and negative circuits are connected through the contact 2221 and the metal inner tube 211, thereby causing a short circuit.

[0062] Working process: Install the inner tube of the cigarette lighter power module on the mounting base of the vehicle cigarette lighter through the slot, ensure that the installation is firm, insert the cigarette lighter into the inner tube, press the pressing head, and the connecting sleeve will move downward with the pressing head, compressing the spring, so that the heating wire of the heater is connected to the positive and negative contacts in the power connection part, and the bimetallic strip is connected to the cigarette lighter. The vehicle power supply starts to supply power to the heater, and the heating wire starts to heat up. When the heating wire is heated to a certain temperature, the bimetallic strip is deformed by the heat, and the bimetallic strip is disconnected from the cigarette lighter. The connecting sleeve is reset under the elastic force of the spring, the circuit is cut off, and the heating process stops.

[0063] When the bimetallic strip fails and the circuit cannot cut off the power automatically, the heating wire continues to heat up, causing the temperature in the inner tube to exceed the temperature during normal operation of the cigarette lighter. The protective sheet arranged under the heating wire expands due to the heat, causing the contacts to collide with the inner wall of the inner tube, causing a short circuit and melting the on-board fuse, thereby forcing the power to be cut off.

[0064] Secondly, when the temperature between the positive and negative sockets is too high, the resistance of the thermistor protection sheet increases dramatically. Since the thermistor protection sheet is located between the negative tab and the inner tube, this increased resistance prevents current from passing through the negative tab to the inner tube, preventing a complete circuit and thus effectively blocking the circuit. The thermistor protection sheet expands in response to temperature changes. The elastic gasket located between the positive and negative tabs mitigates the impact of temperature-related displacement of the tabs and maintains structural stability. As the temperature gradually returns to its normal operating range, the resistance of the thermistor protection sheet returns to its initial lower value, allowing current to pass normally through the negative tab to the inner tube, thereby restoring the normal circuit of the cigarette lighter circuit and preventing further use of the cigarette lighter.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-protection cigarette lighter power module, characterized in that: include: Cigarette lighter (1) and power supply module (2); The power extraction module (2) comprises a negative electrode component (21) and a positive electrode component (22), wherein the negative electrode component (21) and the positive electrode component (22) are respectively connected to the positive and negative electrodes of the vehicle power supply; The negative electrode assembly (21) includes a negative electrode contact (210) and a metal inner tube (211), wherein the negative electrode contact (210) is connected to the metal inner tube (211), the negative electrode contact (210) is connected to the negative electrode of the vehicle power supply, the metal inner tube (211) is sleeved with the cigarette lighter (1), and the metal inner tube (211) is connected to the negative electrode of the cigarette lighter (1); The positive electrode assembly (22) includes a positive electrode contact (220) and a bimetallic strip (221), wherein the positive electrode contact (220) is connected to the bimetallic strip (221), and the positive electrode contact (220) is connected to the positive electrode of the vehicle power supply. The bimetallic strip (221) is located in the metal inner tube (211). When the cigarette lighter (1) is inserted into the metal inner tube (211), the bimetallic strip (221) is squeezed and connected to the positive electrode of the cigarette lighter (1). When the temperature of the cigarette lighter (1) is too high, the bimetallic strip (221) expands and disconnects from the positive electrode of the cigarette lighter (1). The positive electrode assembly (22) further comprises a protective sheet (222), the protective sheet (222) being arranged in the metal inner cylinder (211), the protective sheet (222) being connected to the bimetallic sheet (221), and when the cigarette lighter (1) is overloaded or the temperature is too high, the protective sheet (222) expands due to the heat and contacts the metal inner cylinder (211), forming a short circuit.

2. The multi-protection cigarette lighter power module according to claim 1, characterized in that: The cigarette lighter (1) comprises a pressing head (11), a connecting sleeve (12) and a heater (13); the connecting sleeve (12) is provided on the outer cover of the pressing head (11); the heater (13) is connected to the bottom of the connecting sleeve (12); a protective cover (14) is provided on the outer cover of the connecting sleeve (12); a spring (15) is provided between the connecting sleeve (12) and the protective cover (14); two ends of the spring (15) are respectively arranged to contact the connecting sleeve (12) and the protective cover (14); a porcelain column (16) is provided between the connecting sleeve (12) and the heater (13); the porcelain column (16) is sleeved on the heater (13).

3. The multi-protection cigarette lighter power module according to claim 2, characterized in that: The heater (13) comprises a heating wire (131), a heating wire cover (132), a mica gasket (133) and a clamping pile (134); the heating wire (131) is arranged in the heating wire cover (132); the mica gasket (133) is arranged between the heating wire (131) and the heating wire cover (132); the clamping pile (134) is fixedly connected to the heating wire cover (132); and the heating wire cover (132) is connected to the connecting sleeve (12) via the clamping pile (134).

4. The multi-protection cigarette lighter power module according to claim 1, characterized in that: A positioning groove (2111) is provided on the side wall of the metal inner cylinder (211) corresponding to the bimetallic strip (221). The positioning groove (2111) fits with a protrusion on the edge of the bimetallic strip (221). The positioning groove (2111) provides a free space when the bimetallic strip (221) is heated and expanded. A clamping groove (2112) is also provided on the side wall of the metal inner cylinder (211). The clamping groove (2112) limits the installation position of the metal inner cylinder (211) on the mounting seat.

5. The multi-protection cigarette lighter power module according to claim 1, characterized in that: The power extraction module (2) further comprises a rivet (23), a porcelain seat (24) and a positioning seat (25), wherein the rivet (23) is sequentially passed through the porcelain seat (24), the metal inner tube (211) and the positioning seat (25), the porcelain seat (24) is arranged in the metal inner tube (211), and the negative electrode contact piece (210) and the positive electrode contact piece (220) are press-connected to the positioning seat (25) through the rivet (23).

6. The multi-protection cigarette lighter power module according to claim 5, characterized in that: The bimetallic strip (221) is arranged between the rivet (23) and the porcelain seat (24), and the bimetallic strip (221) is installed on a side of the porcelain seat (24) close to the cigarette lighter (1). The bimetallic strip (221) extends from one side of the porcelain seat (24) toward the cigarette lighter (1), and the extended end of the bimetallic strip (221) is arranged in a contoured manner with the side wall of the cigarette lighter (1).

7. The multi-protection cigarette lighter power module according to claim 1, characterized in that: An elastic gasket (26) is provided between the negative electrode contact (210) and the positive electrode contact (220), and two ends of the elastic gasket (26) are respectively provided to contact the negative electrode contact (210) and the positive electrode contact (220).

8. The multi-protection cigarette lighter power module according to claim 1, characterized in that: A thermistor protection sheet (212) is provided between the negative electrode contact sheet (210) and the metal inner cylinder (211); when the temperature between the negative electrode contact sheet (210) and the positive electrode contact sheet (220) increases, the resistance of the thermistor protection sheet (212) increases, thereby disconnecting the metal inner cylinder (211) from the negative electrode contact sheet (210).

9. The multi-protection cigarette lighter power module according to claim 2, characterized in that: The temperature at which the protective sheet (222) is triggered is T1, the temperature at which the bimetallic sheet (221) is triggered is T2, and the normal operating temperature of the heater (13) is T3, satisfying the relationship: T1>T2>T3.

10. The multi-protection cigarette lighter power module according to claim 1, characterized in that: A contact (2221) is provided at one end of the protective sheet (222) extending outward. When the cigarette lighter (1) is overloaded and the temperature is too high, the protective sheet (222) expands due to the heat, and the contact (2221) is affected by the protective sheet (222) and contacts the inner wall of the metal inner cylinder (211), thereby connecting the positive and negative circuits and causing a short circuit, thereby disconnecting the circuit connection.

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