Miniature constant-flow lighter valve system with temperature compensation function

Abstract

The invention belongs to the technical field of gas burners, and particularly relates to a miniature constant flow lighter valve system with a temperature compensation function, which comprises a gas supply part, a valve body and a gas injection part, and the valve body comprises a main valve and an auxiliary valve arranged in parallel. A thermosensitive rod, a plug piston and a conical air nozzle are arranged in the auxiliary valve to form a temperature control adjusting structure. According to the system, the temperature change of gas in the pressure stabilizing cavity is sensed through the thermosensitive rod, and dynamic adjustment of the ventilation capacity of the conical gas nozzle is achieved, specifically, when the temperature is reduced, the thermosensitive rod shrinks, and the ventilation capacity is increased to compensate for air pressure reduction; when the temperature rises, the thermosensitive rod expands, and ventilation is reduced to restrain air pressure rising. The system can maintain stable gas output at different environment temperatures, obviously improves ignition reliability and combustion consistency of the lighter, and is suitable for a constant-current and pressure-stabilizing scene of a miniature portable ignition device.

Description

Technical Field

[0001] The invention belongs to the technical field of gas burners, and in particular relates to a miniature constant current lighter valve system with a temperature compensation function. Background Art

[0002] Lighters are small, everyday ignition devices, and their internal valve systems often play a key role in controlling gas release and ignition stability. Traditional micro lighters mostly use a constant-flow valve structure to ensure a relatively constant gas flow rate, thereby achieving a stable flame. However, because the gas expansion coefficient is significantly affected by changes in ambient temperature, conventional constant-flow valve systems often have difficulty adapting to changes in air pressure in high or low temperature environments. This can lead to uneven gas release, fluctuating flames, and even ignition failure, seriously affecting user safety and experience.

[0003] To address these issues, some improvements have attempted to adjust the flow rate through mechanical spring compensation or current-limiting structures. However, implementation in microstructures is difficult, and the response speed is slow and the stability is poor. Therefore, integrating a constant-flow valve system with temperature compensation into the micro lighter structure, which can automatically adjust the gas flow rate according to the external temperature and thereby improve ignition stability and combustion efficiency, is a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0004] In view of the above problems, the present invention aims to provide: a miniature constant current lighter valve system with temperature compensation function, comprising an air supply part 1, a valve body 2 and an air injection part 3; The gas supply portion 1 includes an air inlet port 11 and an air supply channel 12. The air inlet port 11 is used to connect to a gas storage tank, and the air supply channel 12 is communicated with the air inlet port 11. The valve body 2 is located at the bottom of the lower end of the air injection part 3, and the valve body 2 includes a main valve 21 and an auxiliary valve 22; The auxiliary valve 22 is arranged in parallel with the main valve 21 to adjust the gas flux in a temperature feedback manner; The jetting portion 3 is connected to the valve body 2 and is used to jet the gas outputted from the valve body 2 . The jetting portion 3 includes a nozzle 31 .

[0005] In a preferred technical solution, a pressure stabilizing chamber 32 is further provided in the jet portion 3, the pressure stabilizing chamber 32 being in communication with the main valve 21, and the pressure stabilizing chamber 32 is used to stabilize the pressure of the incoming gas; The pressure stabilizing chamber 32 is connected to the nozzle 31 through the air guide channel 33; The pressure stabilizing chamber 32 is connected to a temperature control feedback tube 34 , and the other end of the temperature control feedback tube 34 is connected to the temperature control chamber 221 of the auxiliary valve 22 .

[0006] In a preferred technical solution, the auxiliary valve 22 includes a temperature control chamber 221 , a conical air nozzle 222 , a plug piston 223 , a pressure equalizing valve 224 and a parallel air chamber 225 .

[0007] In a preferred technical solution, the temperature control chamber 221 includes a thermosensitive rod 2211 and a compression spring 2212; The compression spring 2212 is used to compensate for the pressure difference caused by the difference in the pressure areas of the plug piston 223 in the temperature control chamber 221 and the parallel air chamber 225; The thermosensitive rod 2211 expands or contracts according to the gas temperature from the temperature control feedback tube 34 , pushes and pulls the plug piston 223 , and cooperates with the conical gas nozzle 222 to adjust the ventilation volume of the parallel gas cavity 225 .

[0008] In a preferred technical solution, the rear end of the plug piston 223 is against the thermistor 2211; the thermistor 2211 expands / contracts according to the gas temperature of the pressure stabilizing chamber 32, and the plug piston 223 drives the plug piston 223 to move according to the amount of expansion / contraction.

[0009] In a preferred technical solution, the conical air nozzle 222 shrinks in an inverted figure eight shape with respect to the thermal rod 2211 toward the nozzle 31 .

[0010] In a preferred technical solution, the expansion / contraction amount of the thermosensitive rod 2211 is positively correlated with the temperature. The higher the temperature, the greater the expansion amount of the thermosensitive rod 2211. When the temperature rises, the thermosensitive rod 2211 expands, the plug piston 223 approaches the conical air nozzle 222, and the ventilation volume of the parallel air cavity 225 increases; When the temperature decreases, the thermosensitive rod 2211 contracts, the plug piston 223 moves away from the conical air nozzle 222 , and the ventilation volume of the parallel air cavity 225 decreases.

[0011] In a preferred technical solution, the pressure equalizing valve 224 has a contracted gas channel, with both ends respectively connected to the temperature control chamber 221 and the parallel gas chamber 225 to achieve pressure balance in the temperature control chamber 221 and the parallel gas chamber 225 .

[0012] Beneficial effects This invention provides a miniature constant-current lighter valve system with temperature compensation. By placing a secondary valve in parallel with the main valve and integrating a temperature-controlled feedback mechanism within the secondary valve, this system automatically adjusts gas flow. Compared to traditional constant-current valve structures, this system effectively compensates for flow instability caused by gas pressure fluctuations when the ambient temperature fluctuates significantly, improving ignition stability and combustion consistency.

[0013] The temperature-control feedback tube in this system connects the pressure-stabilizing chamber and the auxiliary valve's temperature-control chamber, physically isolating the temperature sensing path from the airflow path, improving temperature control response speed and system safety. Through feedback from the temperature sensing path to the thermocouple, the thermocouple in the auxiliary valve expands or contracts according to temperature, driving the plug piston to axially shift relative to the tapered nozzle. This precisely adjusts the airflow volume of the parallel air chambers, maintaining a nearly constant output airflow across the entire system under varying temperature conditions.

[0014] In addition, the temperature control chamber structure composed of the thermal rod, the compression spring and the pressure equalizing valve can effectively balance the internal pressure difference of the auxiliary valve under different working conditions, avoid vibration or intermittent jetting caused by uneven gas flow, and significantly improve the applicability of the lighter in cold or high temperature environments.

[0015] The overall structure of the present invention is compact, suitable for micro-integration, has the advantages of batch molding and low-cost manufacturing, can be widely used in disposable or refillable small lighters, and has good market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the auxiliary valve of the present invention. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0018] Example 1 according to Figure 1 As shown, this embodiment provides a miniature constant current lighter valve system with temperature compensation function, which is suitable for use in outdoor or plateau areas where the ambient temperature changes significantly. It can realize dynamic adjustment of gas output under different temperature conditions to ensure flame stability and combustion efficiency.

[0019] The system includes an air supply unit 1, a valve body 2, and an air injection unit 3. Its structure and functions are as follows: The gas supply portion 1 includes a gas inlet port 11 and a gas supply channel 12. The gas inlet port 11 is connected to a gas storage tank (such as a butane gas cylinder). The gas supply channel 12 guides the gas to the downstream valve body portion to form a gas input path.

[0020] The valve body 2 is located at the bottom of the air-injection section 3 and contains a main valve 21 and a secondary valve 22. The main valve 21 is a conventional constant-pressure flow-limiting valve responsible for maintaining a basic gas flow rate. The secondary valve 22 is connected in parallel with the main valve to compensate for temperature fluctuations in the gas flow output by the main valve.

[0021] like Figure 2 As shown, the auxiliary valve 22 further includes: a temperature control chamber 221 , a tapered air nozzle 222 , a plug piston 223 , a pressure equalizing valve 224 and a parallel air chamber 225 .

[0022] A thermosensitive rod 2211 and a compression spring 2212 are installed within the temperature-control chamber 221. The thermosensitive rod 2211 is made of a metal material with high thermal response characteristics (such as a shape memory alloy or a thermal expansion alloy). One end of the thermosensitive rod is connected to the pressure-stabilizing chamber 32, and it senses the gas temperature in the air injection section 3 in real time via the temperature-control feedback tube 34. The other end of the thermosensitive rod abuts against the plug piston 223, causing it to expand or contract axially with temperature changes, driving the plug piston 223 to move along the auxiliary valve channel.

[0023] When the temperature rises, the thermistor rod 2211 expands, pushing the plug piston 223 closer to the tapered gas nozzle 222, thereby reducing the opening area of ​​the tapered gas nozzle and reducing the ventilation volume of the parallel gas cavity 225, thereby compensating for the problem of intensified combustion caused by the increase in gas temperature and pressure in the pressure-stabilizing chamber 32; conversely, when the temperature drops, the thermistor rod 2211 contracts, driving the plug piston 223 away from the gas nozzle, increasing the ventilation volume of the gas cavity 225, thereby compensating for the problem of reduced combustion caused by the decrease in gas temperature and pressure in the pressure-stabilizing chamber 32.

[0024] The pressure equalizing valve 224 is arranged between the temperature control chamber 221 and the parallel air chamber 225, and contains a fine-pore flow limiting channel inside to ensure the pressure difference between the temperature control chamber and the air chamber is balanced during the operation of the thermal rod, thereby avoiding the instability of the plug piston due to pressure difference vibration.

[0025] The jet part 3 includes a nozzle 31, a pressure stabilizing chamber 32 and an air guide channel 33. The pressure stabilizing chamber 32 is arranged between the main valve 21 and the nozzle to stabilize the main airflow output. The air guide channel 33 guides the stabilized gas to the nozzle 31 to achieve ignition.

[0026] In actual use, if the ambient temperature drops from a normal 20°C to a low temperature of -5°C, the density of the gas output from the main valve increases but the pressure decreases, causing the flame to weaken. At this point, the temperature control feedback tube 34 introduces low-temperature gas into the auxiliary valve temperature control chamber 221, causing the thermocouple 2211 to contract and the plug piston 223 to move away from the nozzle. This increases the air flow in the auxiliary valve chamber 225, thus preventing combustion extinguishment caused by reduced airflow and restoring the flame to a stable state.

[0027] The system's overall dimensions are controlled within Φ8 mm × 15 mm, making it compatible with conventional commercially available disposable micro lighters or metal gas cylinders. All components are mass-produced using injection molding and micro-stamping processes. Experimental results show that within a temperature range of -10°C to 45°C, the valve system maintains a gas output fluctuation rate of less than ±6% and a flame height fluctuation of less than ±2 mm, significantly outperforming existing micro lighters without temperature-compensated structures.

[0028] Example 2 This embodiment provides an integrated micro constant current voltage regulation and temperature compensation control device, which is embedded in a disposable butane lighter. The overall structure is compact and suitable for the space of a standard gas container and a common lighter structure. It solves the problems of existing micro lighters such as gas output being greatly affected by ambient temperature fluctuations and flame instability. It is particularly suitable for use in extreme climatic environments such as cold or high temperature areas.

[0029] System composition and structural layout The system mainly includes three main modules: the gas supply unit 1, the valve body 2 and the gas injection unit 3. The modules are connected through gas flow channels to achieve constant current and voltage stabilization, temperature compensation and refined control of gas output. The gas supply unit 1 includes an inlet port 11 and a gas supply channel 12. The inlet port 11 is used to connect to a liquefied butane gas tank. This port has a conventional rubber airtight connection structure. External pressure (pressing the tank) is used to input the gas into the gas supply channel 12. The gas supply channel 12 is a thin axial tube made of brass or stainless steel with a polished inner wall to ensure smooth and unobstructed gas flow.

[0030] Valve body 2 is the core control component of this system, located at the bottom center axis of the gas injection section 3. It consists of a main valve 21 and a secondary valve 22. The main valve 21 is responsible for maintaining constant pressure and flow, while the secondary valve 22 implements temperature compensation control. The two are connected in parallel, receiving gas input from the gas supply section 1 and outputting it to the gas injection section 3.

[0031] The jet section 3, located at the top of the system, ejects the pressure-regulated gas to form a flame. This section comprises a nozzle 31, a pressure-stabilizing chamber 32, and a gas channel 33. The pressure-stabilizing chamber 32 acts as a buffer and secondary pressure regulator, while the gas is directed to the nozzle 31 through the gas channel 33 to meet ignition requirements. The jet section 3's housing is injection-molded from heat-resistant polyimide plastic or nylon PA66 to prevent deformation or melting under high-temperature conditions.

[0032] Detailed explanation of the auxiliary valve temperature compensation structure The auxiliary valve 22 is the innovative core structure of this embodiment, specifically designed to compensate for and adjust the gas flow in response to changes in external temperature. Its structure includes a temperature-control chamber 221, a tapered gas nozzle 222, a plug piston 223, a compression spring 2212, a thermocouple rod 2211, a pressure-equalizing valve 224, and a parallel gas chamber 225.

[0033] in: The temperature control chamber 221 is a cylindrical structure, equipped with a thermosensitive rod 2211 and a compression spring 2212. The thermosensitive rod 2211 is the main control element and is made of shape memory alloy NiTi. Its length variation range is 0.4mm-1.2mm, and the response temperature range is -10℃ to 50℃.

[0034] The front end of the plug piston 223 is a conical surface, and the rear end is against the thermal rod 2211; when the temperature rises, the thermal rod 2211 expands, pushing the piston 223 forward, approaching the conical air nozzle 222, reducing the cross-sectional area of ​​the ventilation flow channel; conversely, when the temperature drops, the piston 223 moves backward, increasing the ventilation volume.

[0035] The conical air nozzle 222 is a symmetrical double-bevel structure with an aperture in the shape of an inverted figure eight, and the outlet is connected to the parallel air cavity 225. The conical structure provides linear flow resistance adjustment capability, facilitating fine-tuning under small air pressure fluctuations.

[0036] The pressure equalizing valve 224 connects the ventilation micropores between the temperature control chamber 221 and the parallel air chamber 225 to balance the air pressure and avoid adjustment hysteresis or jumping due to uneven force on the front and back of the plug piston.

[0037] Workflow and adjustment mechanism When operating at room temperature (about 20°C), the thermosensitive rod 2211 is in the middle length state, and the plug piston 223 is maintained in the middle area of ​​the tapered gas nozzle 222. At this time, the output gas of the main valve 21 and the auxiliary valve 22 jointly forms a balanced flow, meeting the normal ignition and combustion requirements, and the flame height is stable, about 18 to 20 mm.

[0038] When the temperature rises (for example, to 35°C), thermistor rod 2211 expands, extending up to 1.2mm, pushing plug piston 223 closer to the front end of tapered nozzle 222. This reduces the nozzle outlet opening, decreasing the flow rate of auxiliary valve chamber 225. This effectively compensates for the increased gas pressure and flow rate in the pressure-stabilizing chamber at high temperatures, maintaining a constant gas flow rate.

[0039] When the temperature drops (for example, the environment drops to 5°C), the thermistor rod 2211 shrinks and its length shortens by about 0.8mm, driving the plug piston 223 away from the gas nozzle. The gas nozzle opening increases and the ventilation volume increases accordingly, thereby compensating for the weakening of airflow and combustion caused by the decrease in air pressure, so that the flame maintains a stable height.

[0040] During the instantaneous temperature difference regulation process, the equalizing valve 224 acts as a dynamic buffer element, so that the pressure difference inside and outside the auxiliary valve cavity always tends to be balanced, and the thermal adjustment structure maintains a linear response throughout the entire regulation cycle without jitter or airflow interruption.

[0041] Materials and manufacturing processes In order to meet the requirements of micro size and batch manufacturing, the materials of the system components are selected as follows: The valve body is made of copper alloy C3604 by precision turning; The thermosensitive rod adopts NiTi shape memory wire with a diameter of Φ0.8mm, and the accuracy is controlled within ±0.02mm; The plug piston and spring chamber are made of high-strength engineering plastics (POM or PEEK); The thermal feedback tube uses a polytetrafluoroethylene microtube to encapsulate the metal core to ensure sensitive response and corrosion resistance; All components are assembled by micro-injection molding, turning and laser welding, and the total weight of a single set of components is controlled within 0.8g.

[0042] In addition, due to the use of a secondary valve temperature control compensation structure, passive automatic adjustment can be achieved without the participation of electronic components, effectively reducing electronic control costs and improving system stability. It is suitable for integrated use in various small gas-using products such as combustible gas lighters and portable open flame igniters.

[0043] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniature constant current lighter valve system with temperature compensation function, characterized by: It comprises an air supply portion (1), a valve body (2) and an air injection portion (3); The gas supply portion (1) comprises an air inlet port (11) and an air supply channel (12), wherein the air inlet port (11) is used to connect to a gas storage tank, and the air supply channel (12) is in communication with the air inlet port (11); The valve body (2) is located at the bottom of the lower end of the jet portion (3), and the valve body (2) includes a main valve (21) and a secondary valve (22); The auxiliary valve (22) is arranged in parallel with the main valve (21) to adjust the gas flux in a temperature feedback regulation manner; The jet portion (3) is connected to the valve body (2) and is used to jet the gas output from the valve body (2). The jet portion (3) includes a nozzle (31).

2. The micro constant current lighter valve system with temperature compensation function according to claim 1, characterized in that: A pressure stabilizing chamber (32) is further provided in the jet portion (3), the pressure stabilizing chamber (32) being in communication with the main valve (21), and the pressure stabilizing chamber (32) is used to stabilize the pressure of the incoming gas; The pressure stabilizing chamber (32) is in communication with the nozzle (31) via an air guide channel (33); The pressure stabilizing chamber (32) is connected to a temperature control feedback tube (34), and the other end of the temperature control feedback tube (34) is connected to the temperature control chamber (221) of the auxiliary valve (22).

3. The micro constant current lighter valve system with temperature compensation function according to claim 2, characterized in that: The auxiliary valve (2) comprises a temperature control chamber (221), a conical air nozzle (222), a plug piston (223), a pressure equalizing valve (224) and a parallel air chamber (225).

4. The micro constant current lighter valve system with temperature compensation function according to claim 3, characterized in that: The temperature control chamber (221) comprises a thermosensitive rod (2211) and a compression spring (2212); The compression spring (2212) is used to compensate for the pressure difference caused by the difference in the pressure areas of the plug piston (223) in the temperature control chamber (221) and the parallel air chamber (225); The thermosensitive rod (2211) expands or contracts according to the gas temperature from the temperature control feedback tube (34), pushes and pulls the plug piston (223), and cooperates with the conical gas nozzle (222) to adjust the ventilation volume of the parallel gas cavity (225).

5. The micro constant current lighter valve system with temperature compensation function according to claim 4, characterized in that: The rear end of the plug piston (223) abuts against the thermosensitive rod (2211); the thermosensitive rod (2211) expands / contracts according to the gas temperature of the pressure stabilizing chamber (32), and the plug piston (223) drives the plug piston (223) to move according to the amount of expansion / contraction.

6. The micro constant current lighter valve system with temperature compensation function according to claim 4, characterized in that: The conical air nozzle (222) contracts in an inverted figure eight shape relative to the thermal rod (2211) in the direction of the nozzle (31).

7. The micro constant current lighter valve system with temperature compensation function according to claim 4, characterized in that: The expansion / contraction amount of the thermosensitive rod (2211) is positively correlated with the temperature; the higher the temperature, the greater the expansion amount of the thermosensitive rod (2211); When the temperature rises, the thermosensitive rod (2211) expands, the plug piston (223) approaches the conical air nozzle (222), and the ventilation volume of the parallel air cavity (225) increases; When the temperature decreases, the thermosensitive rod (2211) contracts, the plug piston (223) moves away from the conical air nozzle (222), and the ventilation volume of the parallel air cavity (225) decreases.

8. The micro constant current lighter valve system with temperature compensation function according to claim 3, characterized in that: The pressure equalizing valve (224) has a contracted gas channel, with two ends respectively connected to the temperature control cavity (221) and the parallel gas cavity (225), thereby achieving pressure equalization of the temperature control cavity (221) and the parallel gas cavity (225).

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