A liquid fuel ignition device for a coal-based kitchen range

Abstract

The application discloses a liquid fuel ignition device for a coal-based kitchen range, which comprises an ignition device mainly composed of a vaporizer, an oil inlet pipe, an oil tank, a range head and an ignition needle, the vaporizer is composed of a vaporizing pipe and a nozzle pipe, the oil tank is communicated with the oil inlet of the vaporizer through the oil inlet pipe, an electromagnetic pump is arranged on the oil inlet pipe, the nozzle pipe is welded on the vaporizing pipe, a spray hole is formed in the front end of the nozzle pipe, and an on-off valve for controlling the switch of the spray hole is connected to the rear end of the nozzle pipe; compared with the prior art, the structure of the vaporizer is ingenious, the volume is small, the heat utilization rate is extremely high, the energy consumption is low, the liquid fuel can be quickly and completely vaporized in the vaporizer, the kitchen range can be provided with continuous combustible vapor fuel, the safety of the device is greatly improved, a large amount of fuel cost can be saved for the majority of merchants, a gentle flame is provided, the combustion process is quiet and noiseless, and the device is suitable for household use and use in shops requiring a simmering range.

Description

Technical Field

[0001] This invention relates to the field of stoves, and more particularly to a liquid fuel ignition device for coal-based kitchen stoves. Background Technology

[0002] In the vast commercial stove market, liquefied petroleum gas (LPG) fuel, such as gas cylinders, is widely used in schools, military units, restaurants, hotels, and other multi-person stove applications. This traditional LPG fuel suffers from problems such as low calorific value, high cost, low flash point, flammability, explosiveness, and significant safety hazards. Due to the substantial safety risks posed by LPG fuel, national monitoring has become increasingly stringent. This has led to a shift in commercial stove fuels towards safer fuels with higher flash points—liquid fuels (coal-based liquid fuels).

[0003] Currently, fuel-fired stoves are primarily fuel-injected, mainly used in commercial high-powered stoves for Chinese stir-frying and large woks. They also see some use in other kitchen appliances such as steamers, braising pots, cooking ovens, and clay pot stoves, as well as in heaters. These stoves use pulse fuel pumps to vaporize the fuel, which is convenient to operate, but results in intense combustion, high noise levels, and less than ideal performance, especially in applications requiring gentle heat control. They are unsuitable for home use and also for commercial environments requiring slow cooking, such as hot pot restaurants and soup shops. Therefore, to meet market demand, there is an urgent need to develop a new combustion device with better vaporization and more complete combustion, significantly improving fuel utilization.

[0004] Coal-based liquid fuel for kitchen stoves is a non-toxic, harmless, high-flash-point, alkanes-based clean fuel made from Fischer-Tropsch synthetic hydrocarbons, industrial white oil, and high-flash-point hydrocarbon compounds, compounded with high-molecular-weight oxygenated compounds and additives. Its main advantages are wide applicability, low price, high calorific value, good safety, and cleanliness. While coal-based liquid fuel solves the fuel problem, it lacks a corresponding ignition device. Existing commercial stove equipment cannot use it directly; not only is there no precedent for its development, but if this type of coal-based liquid fuel is not fully vaporized before entering the stove, it cannot burn completely, resulting in liquid accumulation, unpleasant odors, difficulty in cleaning, and even safety issues. Therefore, the equipment requires extremely high vaporization rates for this liquid fuel, and also places high demands on the on / off control of the equipment. While a high-power vaporization device can achieve complete vaporization of liquid fuel, it requires a large power output, results in significant energy loss, and is bulky, making it unsuitable for household use and small stoves. Furthermore, during equipment start-up, shutdown, or when the vaporization device malfunctions, leakage of incompletely vaporized fuel is inevitable. Summary of the Invention

[0005] The purpose of this invention is to provide an ignition device that solves the above-mentioned problems, uses liquid fuel for coal-based kitchen stoves as energy, and achieves stable and safe combustion of the stove over a low flame through structural design of the vaporizer.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a liquid fuel ignition device for a coal-based kitchen stove, comprising an ignition device, which mainly consists of a vaporizer, an oil inlet pipe, an oil tank, a burner head, and an ignition needle. The vaporizer consists of a vaporization pipe and a nozzle pipe. The vaporization pipe is provided with an oil inlet and an air outlet. The oil tank is connected to the oil inlet of the vaporizer through the oil inlet pipe. An electromagnetic pump is provided on the oil inlet pipe. The middle part of the nozzle pipe is welded to the air outlet of the vaporization pipe and is connected to the inside of the vaporization pipe. The nozzle pipe has a spray hole at its front end and an on / off valve for controlling the spray hole is connected to the rear end of the nozzle pipe.

[0007] Preferably, the vaporization tube is composed of an inner heating tube, a heating tube, a middle heating tube sleeve, and an outer heating tube sleeve from the inside out. The heating tube, the middle heating tube sleeve, and the outer heating tube sleeve are sequentially mounted on the inner heating tube. The front end of the inner heating tube is an oil inlet, and the rear end of the inner heating tube is an oil outlet. The rear end face of the middle heating tube sleeve is welded to the area around the oil outlet of the inner heating tube sleeve. The inner diameter of the outer heating tube sleeve is larger than the outer diameter of the middle heating tube sleeve. The front end of the outer heating tube sleeve is sealed and welded to the front end of the middle heating tube sleeve. An air outlet is provided on the outer heating tube sleeve, and the air outlet is located away from the rear end of the outer heating tube sleeve.

[0008] Preferably, the rear end of the heating tube jacket is provided with a cap, which is sealed and welded to the heating tube jacket. The end face of the cap is recessed to form a circular groove structure, and the circular groove is directly opposite the oil outlet of the inner tube of the heating tube.

[0009] Preferably, a heat-conducting pipe is provided between the outer sleeve of the heating tube and the inner sleeve of the heating tube, and the heat-conducting pipe is in close contact with the outer sleeve of the heating tube and the inner sleeve of the heating tube.

[0010] Preferably, a distributor is provided on the oil inlet of the inner tube of the heating tube, the front end face of the distributor is provided with an oil inlet hole, and the rear side wall of the distributor is provided with two or more oil outlet holes, the oil outlet holes being directly opposite the inner side wall of the inner tube of the heating tube.

[0011] Preferably, the on / off valve consists of a solenoid valve core sleeve, a copper valve core, a valve needle, a valve needle seat, a seat sleeve, and a solenoid valve coil. The seat sleeve is fixed to the rear end of the solenoid valve core sleeve and has an exhaust port. The front end of the solenoid valve core sleeve has an air inlet. The valve needle seat is located inside the solenoid valve core sleeve and is slidably connected to it. The copper valve core and the valve needle are mounted on the valve needle seat. A compression spring A is fitted on the copper valve core and is located between the seat sleeve and the valve needle seat. The front end of the valve needle passes through the valve needle seat and extends out of the on / off valve from the air inlet.

[0012] Preferably, the valve needle seat has a positioning groove for mounting the valve needle and the copper valve core. The heads of the valve needle and the copper valve core are both located in the positioning groove and are slidably connected to the valve needle seat. A compression spring B is provided in the positioning groove, and the compression spring B is located between the valve needle and the copper valve core.

[0013] Preferably, a sealing surface A is machined on the inner exhaust port of the seat sleeve, and the sealing surface A is sealed and cooperates with the copper valve core. A tapered sealing surface B is machined on the front end of the valve needle seat, and the sealing surface B is sealed and cooperates with the inner wall of the front end of the solenoid valve core sleeve.

[0014] Preferably, the rear end of the valve needle seat is tapered, and the seat sleeve is machined with a tapered groove that matches the rear end of the valve needle seat.

[0015] Preferably, the solenoid valve coil is wound around the outside of the solenoid valve core sleeve, and the solenoid valve coil is a double coil.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] (1) The vaporizer of the present invention has an ingenious structural design and a small size. The length of the entire vaporizer is about 6cm and the diameter is about 1.2cm. However, it has a very high heat utilization rate and low energy consumption. The use of a 7KW ceramic heating tube can ensure that the liquid fuel is quickly and completely vaporized in the vaporizer, and can provide a continuous supply of combustible gaseous fuel for the stove.

[0018] (2) By designing the structure of the shut-off valve, the shut-off valve can not only realize the on / off control of the nozzle pipe, but also return the incompletely vaporized fuel to the oil tank through the shut-off valve when the device starts or stops or when the vaporization pipe fails, which greatly improves the safety of the device.

[0019] (3) This invention uses coal-based liquid fuel for kitchen stoves and a self-developed vaporizer to revolutionize the current commercial stove combustion system. It can save a lot of fuel costs for merchants, provide a gentle flame, and the combustion process is quiet and noiseless. The gentle flame is suitable for home use and shops that need a gentle flame stove. It can generate huge social benefits for society. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the vaporizer of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the vaporization tube of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the current splitter of the present invention;

[0024] Figure 5 This is a schematic diagram of the heat pipe structure of the present invention;

[0025] Figure 6 This is a disassembly diagram of the vaporization tube and nozzle tube of the present invention;

[0026] Figure 7 This is a schematic diagram of the internal structure of the on / off valve of the present invention.

[0027] In the diagram: 1. Vaporization tube; 11. Inner tube of heating tube; 12. Heating tube; 13. Middle sleeve of heating tube; 14. Outer sleeve of heating tube; 141. Gas outlet; 15. End cap; 16. Heat conducting tube; 17. Diverter; 171. Oil inlet; 172. Oil outlet; 18. Quartz sand; 19. Quartz rope; 2. Nozzle tube; 21. Injection orifice; 22. Temperature sensing seat; 3. On / off valve; 31. Solenoid valve core sleeve; 311. Sealing Cover B; 312. Air inlet; 32. Copper valve core; 321. Distance pad; 33. Valve needle seat; 34. Solenoid valve coil; 35. Valve needle; 351. Snap ring; 36. Seat sleeve; 361. Exhaust port; 362. Sealing surface A; 363. Conical groove; 37. Sealing ring; 38. Compression spring A; 39. Compression spring B; 4. Oil inlet pipe; 5. Oil return pipe; 6. Solenoid pump; 7. Ignition needle; 8. Stove head. Detailed Implementation

[0028] The present invention will be further described below, specifically as follows:

[0029] A liquid fuel ignition device for coal-based kitchen stoves, including an ignition device, see [link to relevant documentation]. Figure 1 and Figure 6The ignition device mainly consists of a vaporizer, an oil inlet pipe 4, an oil tank, a burner head 8, and an ignition needle 7. The vaporizer consists of a vaporization pipe 1 and a nozzle pipe 2. The vaporization pipe 1 is provided with an oil inlet and an air outlet 141. The oil tank is connected to the oil inlet of the vaporizer through the oil inlet pipe 4. An electromagnetic pump 6 is provided on the oil inlet pipe 4. The middle part of the nozzle pipe 2 is welded to the air outlet 141 of the vaporization pipe 1 and is connected to the inside of the vaporization pipe 1. The nozzle pipe 2 has a spray hole 21 at its front end. The nozzle pipe 2 is connected to an on / off valve 33 that controls the opening and closing of the spray hole 21 at its rear end. The front end of the nozzle pipe 2 is directly opposite the fuel inlet of the burner head 8. The ignition needle 7 is located near the exhaust port 361 of the burner head 8. This invention uses an oil tank and an electromagnetic pump 6 to pump liquid fuel into the vaporization tube 1. The liquid fuel is completely vaporized through the vaporization tube 1 in the vaporizer. After being completely vaporized through the vaporization tube 1, it is sprayed from the nozzle into the burner head 8 and ignited by the igniter for combustion, thus realizing the entire process of heating, atomizing and burning liquid fuel.

[0030] To ensure complete vaporization of the liquid fuel within vaporization pipe 1 with low energy consumption, the structural design of the vaporizer is described in the following reference: Figure 2Specifically, the vaporizer consists of, from the inside out, an inner heating tube 11, a heating tube 12, a heating tube sleeve 14, and a heating tube outer sleeve 15. The inner heating tube 11, the heating tube sleeve 14, and the heating tube outer sleeve 15 are made of copper, and the heating tube 12 is a ceramic heating tube. The heating tube 12, the heating tube sleeve 14, and the heating tube outer sleeve 15 are sequentially mounted on the inner heating tube 11. The front end of the inner heating tube 11 is an oil inlet. The rear end is the oil outlet. The rear end face of the heating tube sleeve 14 is welded to the area around the oil outlet of the heating tube inner tube 11. The inner diameter of the heating tube outer sleeve 15 is larger than the outer diameter of the heating tube sleeve 14. The front end of the heating tube outer sleeve 15 is sealed and welded to the front end of the heating tube sleeve 14, forming a hollow jacket structure between the heating tube outer sleeve 15 and the heating tube sleeve 14. An air outlet 141 is provided on the heating tube outer sleeve 15, and the air outlet 141 is located away from the rear end of the heating tube outer sleeve 15. Through the structural design of the heating tube inner tube 11, heating tube 12, heating tube sleeve 14, and heating tube outer sleeve 15, the liquid oil in the heating tube inner tube 11 is heated to form gaseous fuel through the ceramic heating tube 12. The oil is then heated a second time through the hollow jacket structure formed between the heating tube outer sleeve 15 and the heating tube sleeve 14, ensuring complete vaporization. Utilizing a clever structural design, secondary heating can be achieved within a limited space using only one heating element 12. This design maximizes heat utilization both inside and outside the heating element 12, ensuring full utilization of the heat energy generated. Through this ingenious structural design, the vaporizer boasts a compact and sophisticated structure, with a small size—approximately 6cm in length and 1.2cm in diameter—yet exhibits extremely high heat utilization. Experiments have shown that for coal-based stoves using liquid fuel, a 7KW ceramic heating element 12 ensures rapid and continuous heating and vaporization of the liquid fuel within the vaporizer, providing a continuous supply of combustible gaseous fuel for the stove. The product has received unanimous praise from customers.

[0031] Because the rear end face of the heating tube sleeve 14 needs to be welded, a head 15 structure is designed for easy processing. The head 15 is sealed and welded to the heating tube outer sleeve 15, so that a complete hollow jacket structure is formed between the heating tube outer sleeve 15 and the heating tube sleeve 14. When the oil is sprayed out from the oil outlet of the heating tube inner tube 11, it impacts the head 15 and then flows back in the opposite direction, and the oil is heated a second time between the heating tube outer sleeve 15 and the heating tube sleeve 14.

[0032] In order to improve the vaporization rate of the oil sprayed from the oil outlet of the inner tube 11 of the heating tube, this application also has a clever structural design for the end cap 15. The end face of the end cap 15 is recessed to form a circular groove structure. The circular groove is directly opposite the oil outlet of the inner tube 11 of the heating tube. The circular groove has the function of guiding air and dispersing oil to make it vaporize better. During operation: After the oil is heated once in the inner tube 11 of the heating tube by the heating tube 12, an incompletely vaporized oil-gas mixture is formed. The oil-gas mixture rushes out from the oil outlet of the inner tube 11 and directly impacts the circular groove to disperse. At this time, the completely vaporized gaseous fuel and some tiny liquid oil particles in the oil-gas mixture will disperse outward along the airflow direction formed by the circular groove, and flow in the opposite direction to the space between the outer sleeve 15 and the middle sleeve 14 of the heating tube for secondary heating and complete vaporization. Meanwhile, some oil particles with larger molecular particles in the oil-gas mixture will directly impact the inner surface of the circular groove. Some of them will break apart to form small molecule oil particles, which will fly away with the airflow. Some liquid oil particles will impact and adhere to the surface of the circular groove, and disperse outward along the circular groove to form an oil film. The oil film is easier to vaporize. After being heated and vaporized by the outer sleeve 15 of the heating tube, it will enter the space between the outer sleeve 15 and the middle sleeve 14 of the heating tube for secondary heating. By designing the structure of the end cap 15, the oil entering between the outer sleeve 15 and the inner sleeve 14 of the heating tube is mostly gaseous fuel and a small amount of fine particulate oil, ensuring that it can be completely vaporized after secondary heating, thereby greatly improving the vaporization rate of the oil.

[0033] Because the heating tube outer jacket 15 and the heating tube inner jacket 14 are designed with a jacket, the thermal conductivity of air is low, which can easily cause a large temperature difference between the inner and outer heating elements, affecting the vaporization effect. Therefore, a heat-conducting pipe 16 is provided between the heating tube outer jacket 15 and the heating tube inner jacket 14. (See [reference]) Figure 5 The heat-conducting pipe 16 is tightly attached between the outer jacket 15 and the inner jacket 14 of the heating pipe. The heat-conducting pipe 16 rapidly conducts heat from the inner jacket 14 to the outer jacket 15, allowing both the outer jacket 15 and the inner jacket 14 to simultaneously and evenly heat the oil within the hollow jacket cavity, thereby improving vaporization. Furthermore, the heat-conducting pipe 16 increases the heating area, directly heating the oil flowing through it. To further increase the contact area between the oil and the heat-conducting pipe 16, the guide tube is designed as a longitudinal corrugated pipe, and the cross-section of the heat-conducting pipe 16 is wavy. When vaporized oil flows along the length of the heat-conducting pipe 16, the undulating shape of the pipe increases the heating area, significantly improving the heat exchange rate and further enhancing the vaporization effect.

[0034] Experiments revealed that when oil is directly added to the inner tube 11 of the heating pipe through the oil inlet pipe 4, the oil entering the inner tube 11 forms a columnar shape. Due to the limited contact area and short contact time, the central part of the columnar oil is difficult to be completely vaporized by the heating pipe 12, affecting the vaporization rate of the oil. Therefore, a distributor 17 is designed at the oil inlet of the inner tube 11 of the heating pipe. (See [reference]) Figure 4 The front end face of the distributor 17 is provided with an oil inlet hole 171, and the rear side wall of the distributor 17 is provided with two or more oil outlet holes 172. The oil inlet pipe 4 is connected to the oil inlet hole 171 of the distributor 17. The oil outlet hole 172 is directly opposite the inner side wall of the inner tube 11 of the heating tube. The distributor 17 diverts and turns the oil entering the inner tube 11 of the heating tube. The oil is pressurized by the oil pump and injected into the distributor 17 through the oil inlet pipe 4 from the large oil inlet hole 171. The oil is sprayed out in a fan shape from the oil outlet hole 172 and sprayed onto the inner wall of the inner tube 11 of the heating tube. The oil flows slowly along the inner wall of the inner tube 11 of the heating tube along the oil outlet. During the flow process, the oil is heated by the heating tube 12, which greatly improves the vaporization rate of the oil.

[0035] A gap is left between the inner heating tube and the heating tube sleeve 14, providing space for the installation of the heating tube 12. This gap is filled with quartz sand 18. Because ceramic and copper have different coefficients of thermal expansion, this gap allows the quartz sand 18 to act as a buffer during thermal expansion, preventing damage caused by mutual compression. Furthermore, if the gap were entirely filled with air, its heat conduction would be slow; filling it with the highly conductive quartz sand 18 effectively improves the thermal conductivity. The quartz sand 18 also helps to fix the heating tube 12, preventing it from swaying. A quartz rope 19 is filled at the front opening between the heating tube sleeve 14 and the heating tube 12. The quartz rope 19 has excellent thermal conductivity and, when sealed at the port, prevents the quartz sand 18 from leaking out.

[0036] After assembly, asbestos insulation material can be applied to the outer wall of the heating tube jacket 15 to form an asbestos insulation layer. The asbestos insulation layer wraps around the vaporization tube 1 to achieve the insulation effect and reduce heat exchange with the air.

[0037] Through the above improvements to vaporization tube 1, our designed vaporization tube 1 has an extremely high heat conversion rate. The low-energy heating rod can meet the combustion needs of the stove. Moreover, the vaporizer has a very small structural volume, which is conducive to its installation and placement inside the stove.

[0038] During use, it was found that because coal-based cooktops use coal-based liquid fuel, the heating element needs time to heat up when the cooktop is first turned on. The liquid fuel entering through the oil inlet and the original residual liquid fuel in the vaporizer cannot be completely vaporized immediately. The unvaporized fuel cannot be completely burned and is difficult to clean if it drips into the cooktop, potentially leading to safety accidents. Furthermore, although the unvaporized fuel sprayed from the nozzle pipe 2 is non-toxic, it still has a certain odor, which some customers find unacceptable. Therefore, a temperature sensor mount 22 is installed on the nozzle pipe 2 to install a temperature sensor to detect the temperature inside the nozzle pipe 2.

[0039] The structure of the on / off valve 33 was also developed and designed; see [link / reference]. Figure 7 Specifically, the on / off valve 33 consists of a solenoid valve core sleeve 31, a copper valve core 32, a valve needle 35, a valve needle seat 33, a seat 36, and a solenoid valve coil 34. The seat 36 is fixed to the rear end of the solenoid valve core sleeve 31. The seat 36 has an exhaust port 361, which is connected to the return oil pipe 5 for recovering fuel that has not been fully vaporized during the initial startup of the equipment. The front end of the solenoid valve core sleeve 31 has an air inlet 312, which is connected to the inside of the solenoid valve core sleeve 31. The valve needle seat 33 is located inside the solenoid valve core sleeve 31 and is slidably connected to the solenoid valve core sleeve 31. The copper valve core 32 and the valve needle 35 are installed on the valve needle seat 33. A compression spring A38 is fitted on the copper valve core 32. The compression spring A38 is located between the seat 36 and the valve needle seat 33. The front end of the valve needle 35 passes through the valve needle seat 33 and extends out of the on / off valve 33 from the air inlet 312. The valve needle seat 33 has a positioning groove for mounting the valve needle 35 and the copper valve core 32. The heads of the valve needle 35 and the copper valve core 32 are both located in the positioning groove and are slidably connected to the valve needle seat 33. A compression spring B39 is provided in the positioning groove, and the compression spring B39 is located between the valve needle 35 and the copper valve core 32. Among them, the compression spring A38 is a large compression spring, and the compression spring B39 is a pin compression spring. The elastic force of the compression spring A38 is greater than that of the compression spring B39. The inner vent 361 of the seat sleeve 36 is machined with an vent 361, which is sealed and cooperates with the copper valve core 32. The front end of the valve needle seat 33 is machined with a conical sealing surface B311, which is sealed and cooperates with the inner wall of the front end of the solenoid valve core sleeve 31.

[0040] When the solenoid valve coil 34 is energized, the magnetic field drives the valve needle seat 33 to move to the rear end, which in turn drives the copper valve core 32 and valve needle 35 to move, thereby realizing the on / off control of each sealing surface and the device under control, so as to meet the switching needs of the system in various states.

[0041] The rear end of the valve needle seat 33 is tapered, and the seat sleeve 36 is machined with a tapered groove 363 that matches the rear end of the valve needle seat 33. The tapered groove 363 serves as a centering guide, ensuring that the copper valve core 32 and the seat sleeve 36 remain coaxial as the valve needle seat 33 moves backward, thus better achieving a seal between the copper valve core 32 and the exhaust port 361 on the seat sleeve 36. The solenoid valve coil 34 is wound around the outside of the solenoid valve core sleeve 31. The solenoid valve coil 34 is a double coil, which enables dual-stroke drive control of the valve needle seat 33.

[0042] A sealing ring 37 is fitted on the seat sleeve 36. The sealing ring 37 is located between the seat sleeve 36 and the solenoid valve core sleeve 31. An annular groove for installing the sealing ring 37 is machined on the outer diameter of the seat sleeve 36. The sealing ring 37 achieves an airtight seal between the seat sleeve 36 and the solenoid valve core sleeve 31, preventing gas leakage.

[0043] The copper valve core 32 is fixed with a distance pad 321 to limit the compression spring A38. The valve needle seat 33 has a through hole to facilitate the protrusion of the valve needle 35. The valve needle 35 is fitted with a retaining spring 351 to limit the travel distance of the valve needle 35. The outer wall of the valve needle seat 33 has a vertical guide groove, and the inner wall of the solenoid valve core sleeve 31 has a strip-shaped protrusion that matches the guide groove. The valve needle seat 33 is slidably connected to the solenoid valve core sleeve 31 through the guide groove and the strip-shaped protrusion.

[0044] During assembly, the front end of the solenoid valve core sleeve 31 is fixed to the rear end of the nozzle tube 2. The rear end seat 36 of the solenoid valve core sleeve 31 is connected back to the oil pipe 5 and connected to the oil tank. The nozzle tube 2 is equipped with a temperature sensor. A spray hole 21 matching the tip of the valve needle 35 is opened at the front end of the nozzle tube 2. The front end of the valve needle 35 extends into the nozzle tube 2 and presses against the spray hole 21, forming a sealing structure between it and the nozzle tube 2.

[0045] When not energized: Due to the action of compression springs A38 and B39, the valve needle seat 33 is pressed against the front end of the solenoid valve core sleeve 31, forming a sealing structure with the sealing surface B311; due to the action of compression spring B39, the valve needle 35 is also pressed against the injection hole 21 of the nozzle tube 2, forming a closed state; at the same time, the copper valve core 32 and the exhaust port 361 are in the open state. At this time, the solenoid valve on / off valve 33 is in the closed state.

[0046] Power-on state 1: When the fuel is not completely vaporized, for example, during the initial startup of the equipment when the heater gradually heats up, the incompletely vaporized fuel cannot be supplied for combustion. At this time, power-on state 1 is activated, and one set of coils is energized. The coils generate an induced magnetic field, driving the valve needle seat 33 to move backward a small distance. At this time, the sealing surface B311 between the valve needle seat 33 and the solenoid valve core sleeve 31 opens; at the same time, the valve needle 35 and the injection hole 21 remain closed, and the copper valve core 32 and the exhaust port 361 remain open. The incompletely vaporized fuel enters the solenoid on / off valve 33 from the sealing surface B311 and returns to the oil tank through the return oil pipe 5 for recirculation.

[0047] Power-on state 2: When the temperature sensor detects that the gas in the nozzle tube 2 has reached a certain temperature, it indicates that the fuel has been completely vaporized and combustion can be carried out. At this time, the coil of power-on state 1 is closed and power-on state 2 is activated, so the other set of coils is energized. At this time, the valve needle seat 33 continues to retract until the copper valve core 32 and the exhaust port 361 are tightly fitted and in a closed state, stopping the return of oil. At the same time, the valve needle 35 is lifted, the injection hole 21 is opened, and the nozzle tube 2 injects gaseous fuel outward, which is ignited by the igniter to carry out combustion.

[0048] Through the above structural design, the vaporizer of this invention can heat liquid fuel to 190°C for vaporization with minimal power consumption, thereby achieving combustion conditions. The fuel vaporized by this vaporizer produces a gentle, uniform, and continuous blue flame with high calorific value and short heating time, meeting market demand for a gentle flame. This saves fuel for businesses while ensuring safety, thus greatly improving economic benefits. It can completely replace high-risk fuel equipment such as gas cylinders. This invention is not only applicable to coal-based fuels but can also be applied to other types of liquid fuels, including petroleum-based fuels.

[0049] The present invention provides a detailed description of a liquid fuel ignition device for a coal-based kitchen stove. Specific examples have been used to illustrate the principle and implementation of the invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the invention. At the same time, for those skilled in the art, based on the idea of ​​the invention, there will be changes in the specific implementation and application scope. Modifications and improvements to the invention are possible without exceeding the concept and scope specified in the appended claims. Therefore, the content of this specification should not be construed as a limitation of the invention.

Claims

1. A liquid fuel ignition device for coal-based kitchen stoves, comprising an ignition device, characterized in that: The ignition device mainly consists of a vaporizer, an oil inlet pipe, an oil tank, a burner head, and an ignition needle. The vaporizer consists of a vaporization tube and a nozzle tube. The vaporization tube has an oil inlet and an air outlet. The oil tank is connected to the oil inlet of the vaporizer through the oil inlet pipe. An electromagnetic pump is installed on the oil inlet pipe. The middle part of the nozzle tube is welded to the air outlet of the vaporization tube and is connected to the inside of the vaporization tube. The front end of the nozzle tube has a spray hole, and the rear end of the nozzle tube is connected to an on / off valve to control the spray hole switch. The vaporization tube consists of, from the inside to the outside, an inner heating tube, a heating tube, a middle heating tube sleeve, and an outer heating tube. The heating tube, the middle heating tube sleeve, and the outer heating tube... The outer sleeve is sequentially installed on the inner tube of the heating tube. The front end of the inner tube is the oil inlet, and the rear end is the oil outlet. The rear end face of the middle sleeve is welded to the perimeter of the oil outlet of the inner tube. The inner diameter of the outer sleeve is larger than the outer diameter of the middle sleeve. The front end of the outer sleeve is sealed and welded to the front end of the middle sleeve. An air outlet is provided on the outer sleeve, which is far from the rear end of the outer sleeve. A cap is provided at the rear end of the outer sleeve, which is sealed and welded to the outer sleeve. The end face of the cap is recessed to form a circular groove structure, which is directly opposite the oil outlet of the inner tube.

2. The liquid fuel ignition device for a coal-based kitchen stove according to claim 1, characterized in that: A heat-conducting pipe is provided between the outer sleeve of the heating tube and the inner sleeve of the heating tube, and the heat-conducting pipe is in close contact with the outer sleeve of the heating tube and the inner sleeve of the heating tube.

3. The liquid fuel ignition device for a coal-based kitchen stove according to claim 1, characterized in that: A distributor is provided on the oil inlet of the inner tube of the heating tube. An oil inlet hole is opened on the front end face of the distributor, and two or more oil outlet holes are opened on the rear side wall of the distributor. The oil outlet holes are directly opposite the inner side wall of the inner tube of the heating tube.

4. The liquid fuel ignition device for a coal-based kitchen stove according to claim 1, characterized in that: The on / off valve consists of a solenoid valve core sleeve, a copper valve core, a valve needle, a valve needle seat, a seat sleeve, and a solenoid valve coil. The seat sleeve is fixed to the rear end of the solenoid valve core sleeve and has an exhaust port. The front end of the solenoid valve core sleeve has an air inlet. The valve needle seat is located inside the solenoid valve core sleeve and is slidably connected to it. The copper valve core and the valve needle are mounted on the valve needle seat. A compression spring A is fitted on the copper valve core and is located between the seat sleeve and the valve needle seat. The front end of the valve needle passes through the valve needle seat and extends out of the on / off valve from the air inlet.

5. A liquid fuel ignition device for a coal-based kitchen stove according to claim 4, characterized in that: The valve needle seat has a positioning groove for installing the valve needle and the copper valve core. The heads of the valve needle and the copper valve core are both located in the positioning groove and are slidably connected to the valve needle seat. A compression spring B is provided in the positioning groove, and the compression spring B is located between the valve needle and the copper valve core.

6. A liquid fuel ignition device for a coal-based kitchen stove according to claim 4, characterized in that: The inner exhaust port of the seat sleeve is machined with a sealing surface A, which is sealed and cooperates with the copper valve core. The front end of the valve needle seat is machined with a tapered sealing surface B, which is sealed and cooperates with the inner wall of the front end of the solenoid valve core sleeve.

7. A liquid fuel ignition device for a coal-based kitchen stove according to claim 4, characterized in that: The rear end of the valve needle seat is tapered, and the seat sleeve is machined with a tapered groove that matches the rear end of the valve needle seat.

8. A liquid fuel ignition device for a coal-based kitchen stove according to claim 4, characterized in that: The solenoid valve coil is wound around the outside of the solenoid valve core sleeve, and the solenoid valve coil is a double coil.

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