Secondary fire distribution combustion cylinder for liquid fuel and gas stove

Abstract

The utility model discloses a liquid fuel and gas stove secondary fire distribution combustion cylinder, the secondary fire distribution combustion cylinder is composed of a fire distribution cylinder, a seal cover and a base plate, the fire distribution cylinder is vertically arranged, the periphery of the fire distribution cylinder is provided with fire distribution holes, the seal cover is arranged at the top end of the fire distribution cylinder, the center of the base plate is in the shape of a gradually-shrunk close-up, and the fire distribution holes are formed in the periphery of the fire distribution cylinder. The closing-in position of the base plate is fixedly connected with the bottom end of the fire distributing cylinder. Compared with the prior art, in order to meet the product requirements, a secondary combustion structure is designed, spiral airflow generated by a primary combustion cavity below can be well collected through the gradually-shrunk closing-up shape of the base plate, the fire distribution barrel is vertically arranged on the base plate and can stretch into the combustion barrel, and therefore the combustion efficiency is improved. Secondary vaporization combustion of liquid fuel is promoted through the high temperature of the lower portion of the combustion cylinder, meanwhile, when the vaporized liquid fuel is collected into the fire distribution cylinder through the base plate, due to the fact that the circulation area is reduced, the heat value generated by combustion heating is enough to meet the requirement that the liquid fuel is completely vaporized and combusted under the condition of low oil supply in a small fire mode.

Description

Technical Field

[0001] This utility model relates to the field of liquid fuels and gas stoves, and in particular to a two-stage combustion chamber for liquid fuels and gas 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 significant safety risks associated with LPG fuel, national monitoring has become increasingly strict, prohibiting non-residential users from using LPG. This has led to a shift in commercial stove fuels towards safer fuels with higher flash points—liquid fuels (coal-based liquid fuels). Coal-based liquid fuel for kitchen stoves is a non-toxic, harmless, high-flash-point liquid kitchen stove fuel primarily composed of alkanes, made from Fischer-Tropsch synthetic hydrocarbons, industrial white oil, high-flash-point hydrocarbon compounds, and other raw materials, compounded with high-molecular-weight oxygenated compounds and additives. The main advantages of this fuel are its wide applicability, low price, high calorific value, good safety, and clean and environmentally friendly nature.

[0003] In gas stoves, the emission of fuel from the gas outlet generates noise, especially in liquid fuel stoves. Liquid fuel stoves are primarily electronically injected fuel stoves, mainly used in commercial high-powered stoves for Chinese stir-frying and large wok cooking, as well as other kitchen appliances such as steamers, braising pots, cooking ovens, and clay pot stoves. The combustion process in electronically injected fuel stoves requires pressurizing the liquid fuel to 12 kg / m³. This pressurization ensures that the liquid fuel is atomized from the nozzle. Air is then forced into the stove's air chamber by a fan, mixing with the atomized liquid fuel before combustion occurs, heating the cookware. Because of the need for pressurized atomization and fan blowing, the air pressure at the stove's burner outlet is very high, generating significant noise. In some enclosed combustion applications of liquid fuel stoves, such as steam generators and steamers, the liquid fuel heats water pipes within a closed chamber. In these cases, simply installing a commercially available silencer pipe at the air outlet of the chamber can reduce the exhaust noise. However, some open gas stoves, such as wok stoves, hot pot stoves, and clay pot stoves, which require the flame to directly heat the pot, cannot reduce noise.

[0004] Solving the noise problem would greatly promote the application and promotion of liquid fuels and gas stoves, especially in places where a quiet working environment is required, such as household stoves.

[0005] Our company has developed the first generation of liquid fuel and gas stoves, see CN202410224133.0 A multi-stage split energy-saving combustion device for liquid fuel. This product, through the structural design of the ion burner, fundamentally changes the atomization combustion method of the original electric fuel injection stove. Liquid fuel does not need to be atomized through high pressure. Utilizing the temperature generated by the primary combustion in the first-stage combustion chamber of the ion burner, combined with the cyclone air intake of the cyclone air intake cylinder, the liquid fuel is dispersed, achieving true high-temperature vaporization. Stable and complete vaporization occurs in the second-stage combustion chamber between the lower ring of the combustion cylinder and the ion fire-distributing teeth. In the third-stage combustion chamber within the combustion cylinder, the liquid fuel is fully burned and heated, ensuring complete combustion. The combustion device no longer heats directly with a flame, but rather the fuel is heated by thermal radiation after complete combustion. Compared with direct flame heating, the heating effect is better, greatly improving the heat utilization rate and greatly reducing heat energy loss. Compared with electric fuel injection stoves, the heat utilization rate is nearly doubled, and the energy consumption of oil and electricity is only half of the original. Moreover, it is safer, more independent, and has wider applicability. Even in low-heat mode, the liquid fuel can stably undergo fission combustion on the ion-distribution teeth of the secondary combustion chamber, continuously generating stable heat. Compared to existing electronically fuel-injected gas stoves, although the wind pressure and fuel injection pressure are greatly reduced.

[0006] To address the noise issues of first-generation liquid fuel and gas stoves, our company developed a second-generation liquid fuel and gas stove, as described in CN202410633760.X: A Multi-Stage Silent Energy-Saving Combustion Device for Liquid Fuels. This device incorporates a porous ceramic silencer within the combustion chamber, utilizing the porous ceramic to absorb and reduce noise from the spirally rising combustion gases. The addition of the porous ceramic silencer spontaneously creates a vortex hot air field in the lower half of the silencer, ensuring thorough heating and vaporization of the incoming liquid fuel, thus forming a natural secondary combustion chamber. This alters the multi-stage combustion system of the first-generation product, eliminating the need for the secondary combustion chamber design between the lower ring of the combustion chamber and the ion-distributing flame teeth.

[0007] Regarding the secondary combustion section, the first-generation product used a secondary combustion chamber between the lower ring of the combustion chamber and the ion-distributing flame teeth to further heat and vaporize the fuel that had undergone primary vaporization and combustion. However, the ion-distributing flame teeth affected the spiral upward airflow, and the space between the lower ring of the combustion chamber and the ion-distributing flame teeth was limited in height, and the temperature in this area was not very high, resulting in less than perfect secondary vaporization and combustion. The second-generation product utilized the naturally formed vortex hot air field at the bottom of a porous ceramic silencer to achieve secondary heating and vaporization of the fuel that had undergone primary vaporization and combustion. The advantages were a reduced combustion chamber length, increased primary combustion chamber temperature, more complete primary vaporization, no "oil splattering," and a solution to the noise problem. However, because the ion-distributing flame teeth and the lower ring of the combustion chamber were eliminated, when the low-fire mode was activated, the low fuel supply and low calorific value made it easy for the liquid fuel to not be completely vaporized and fully combusted. This resulted in an odor and the production of unburned CO gas during low-fire mode. Therefore, the secondary combustion section was redesigned to address these issues. Utility Model Content

[0008] The purpose of this invention is to provide a two-stage combustion chamber for liquid fuel and gas stoves that solves the noise problem and achieves noise reduction.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is: a two-stage combustion chamber for a liquid fuel and gas stove, the two-stage combustion chamber being composed of a combustion chamber, a cover and a base. The combustion chamber is vertically arranged and has combustion holes evenly distributed around its perimeter. The cover is located at the top of the combustion chamber. The center of the base is tapered, and the tapered part of the base is fixedly connected to the bottom end of the combustion chamber.

[0010] Preferably, the chassis and the cover are welded to the fire tube respectively.

[0011] Preferably, both the top and bottom surfaces of the cover are arc-shaped.

[0012] Preferably, the chassis has annular flanges around its perimeter.

[0013] Preferably, the flange folds upward to form an annular debris storage trough between the flange, the chassis, and the fire distribution tube.

[0014] Preferably, there are multiple ignition holes, which are evenly distributed along the circumference of the ignition cylinder and are staggered between the upper and lower ignition holes.

[0015] Preferably, all the fire distribution holes are inclined along the same tangential direction of the fire distribution tube.

[0016] Preferably, the refractory insulation layer is formed by casting refractory clay.

[0017] Preferably, the secondary combustion chamber is made of 301S stainless steel.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] 1. To meet product requirements, this utility model designs a novel two-stage combustion structure. The gradually narrowing shape of the chassis effectively gathers the spiral airflow generated by the primary combustion chamber below. Since the fire distribution tube is vertically mounted on the chassis, it can extend into the combustion chamber. The high temperature at the bottom of the combustion chamber promotes the secondary vaporization and combustion of the liquid fuel. At the same time, when the vaporized liquid fuel is collected in the fire distribution tube through the chassis, due to the reduced flow area, the vaporized liquid fuel will gather together and burn to generate heat. The calorific value produced is sufficient to ensure the complete vaporization and combustion of the liquid fuel under low fuel supply conditions in low-fire mode, effectively avoiding the generation of odors from incomplete combustion.

[0020] 2. The fire distribution tube has fire distribution holes around its perimeter and a cap on top, which enables the fire distribution tube to release air in a lateral spiral direction to match the spiral air release method of the product.

[0021] 3. The design of the cover and the flip-edge of the chassis can prevent debris and water stains from falling into the first-stage combustion chamber below, affecting the ignition operation and preventing the flameout in the first-stage combustion chamber. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the bottom structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the assembly of the present invention inside the stove body.

[0025] In the diagram: 1. Combustion tube; 2. Porous ceramic silencer; 3. Secondary combustion tube; 31. Flame tube; 32. Cover; 33. Chassis; 34. Flame hole; 35. Flanged edge; 36. Waste storage tank; 4. Combustion body; 5. Primary combustion chamber. Detailed Implementation

[0026] The present invention will be further described below: A two-stage combustion chamber 3 for a liquid fuel and gas stove, see [reference]. Figures 1 to 3The secondary combustion chamber 3 is composed of a combustion chamber 31, a cover 32, and a base 33. The combustion chamber 31 is vertically arranged and has combustion holes 34 evenly distributed around its perimeter. The cover 32 is located at the top of the combustion chamber 31. The center of the base 33 is tapered. The tapered part of the base 33 is fixedly connected to the bottom of the combustion chamber 31. The base 33 and the cover 32 are welded to the combustion chamber 31 respectively. To meet product requirements, this utility model designs a novel two-stage combustion structure, namely a two-stage combustion chamber 3. The chassis 33 has a tapered shape, which can effectively collect the spiral airflow generated by the primary combustion chamber 5 below. The liquid fuel is ignited and vaporized in the primary combustion chamber 5, and then enters the combustion chamber 31 with the spiral airflow generated by the fan. Secondary combustion takes place in the combustion chamber 31. Since the combustion chamber 31 is vertically set on the chassis 33, it can extend into the combustion chamber 1. The high temperature at the bottom of the combustion chamber 1 promotes the secondary vaporization and combustion of the liquid fuel.

[0027] Compared to the first-generation product, the two-stage combustion chamber 3 of this invention has a higher reaction height, providing a sufficiently large combustion space for the vaporized liquid fuel. Furthermore, the higher temperature inside the combustion chamber 1 is more conducive to the complete vaporization and combustion of the liquid.

[0028] Compared to the second-generation product, the liquid fuel, after vaporization and combustion in the primary combustion chamber 5, can directly reach the vicinity of the vortex hot air field area at the bottom of the ceramic muffler through the fire distribution tube 31. The high temperature of the vortex hot air field area ensures that the liquid fuel achieves complete vaporization and combustion. The fire distribution tube 31 has fire distribution holes 34 around its perimeter and a cap 32 on its top, which allows for lateral flame and gas output from the fire distribution tube 31. Since the primary combustion chamber 5 uses a spiral air intake method, the gas output from the fire distribution tube 31 is also spirally ejected, which does not affect the spiral ascent of the vaporized liquid fuel within the combustion tube 1. Combined with the porous ceramic muffler 2 within the combustion tube 1 of the second-generation product, this promotes complete vaporization and combustion of the liquid fuel and reduces noise.

[0029] Based on the first and second generation products, this utility model designs a two-stage combustion chamber 3, which is more conducive to the vaporization and combustion of liquid fuel. Since the combustion chamber 31 is placed inside the combustion chamber 1, its diameter is much smaller than that of the combustion chamber 1. When the vaporized liquid fuel is collected into the combustion chamber 31 through the chassis 33, due to the reduction in the flow area, the vaporized liquid fuel will gather together to burn and generate heat. The calorific value produced is sufficient to meet the requirement of complete vaporization and combustion of liquid fuel under low fuel supply conditions in low-fire mode, effectively avoiding the generation of odor from incomplete combustion.

[0030] The top and bottom surfaces of the cover 32 are both arc-shaped. The arc-shaped structure of the top surface of the cover 32 can prevent debris or accidental water spillage from falling from above the secondary combustion chamber 3 into the primary combustion chamber 5 below the secondary combustion chamber 3, which would affect the ignition of liquid fuel and cause the gas stove to go out. The arc-shaped structure of the bottom surface of the cover 32 has a guiding function, which can guide the vertical airflow to the surrounding flame distribution holes 34.

[0031] The chassis 33 is provided with annular flanges 35 around its perimeter. The flanges 35 can be used as connecting parts and welded to the lower combustion body 4. At the same time, after the flanges 35 are folded upwards, they form annular debris storage grooves 36 between themselves, the chassis 33 and the fire distribution tube 31. These grooves have a certain waterproof capability, preventing impurities and water from entering the primary combustion chamber and affecting the combustion function. The debris can be cleaned periodically, and water stains will evaporate at high temperatures.

[0032] To improve the ignition effect of the secondary ignition combustion tube 3, there are multiple ignition holes 34. These multiple ignition holes 34 are evenly distributed along the circumference of the ignition tube 31, and the upper and lower ignition holes 34 are staggered. The size and number of ignition holes 34 are determined according to different combustion power.

[0033] Since the primary combustion chamber 5 of our product adopts cyclone air intake, in order to reduce the impact on the cyclone airflow direction, as a preferred solution, the flame distribution holes 34 are all inclined along the same tangential direction of the flame distribution tube 31, and the inclination direction is consistent with the spiral flow direction of the spiral airflow.

[0034] The secondary combustion chamber 3 is made of 301S stainless steel. 301S stainless steel has excellent high-temperature strength, fatigue strength and corrosion resistance, which can meet the high-temperature corrosion prevention conditions inside the gas stove.

[0035] The above provides a detailed description of a liquid fuel and a two-stage combustion chamber for a gas stove. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, based on the idea of ​​this utility model, there will be changes in the specific implementation and application scope. Modifications and improvements to this utility model 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 this utility model.

Claims

1. A two-stage combustion chamber for a liquid fuel and gas stove, characterized in that: The secondary fire-spreading combustion cylinder is composed of a fire-spreading cylinder, a cover and a bottom plate, the fire-spreading cylinder is vertically arranged and uniformly provided with fire-spreading holes around, the cover is arranged at the top end of the fire-spreading cylinder, and the center of the bottom plate is in the shape of a tapered necking.

2. A two-stage pilot burner for liquid fuel and gas cookers as claimed in claim 1, wherein: The bottom plate and the cover are respectively welded with the fire-spreading cylinder.

3. A two-stage pilot burner for liquid fuel and gas cookers as claimed in claim 1, wherein: The top surface and the bottom surface of the cover are both arc surfaces.

4. A two-stage pilot burner for liquid fuel and gas cookers as claimed in claim 1, wherein: The bottom plate is provided with an annular flange around.

5. A two-stage pilot burner for liquid fuel and gas cookers according to claim 4, characterized in that: The annular flange is folded upward to form an annular sundry storage tank between the bottom plate and the fire-spreading cylinder.

6. A two-stage pilot burner for liquid fuel and gas cookers as claimed in claim 1, wherein: The fire-spreading holes are multiple, and the multiple fire-spreading holes are uniformly distributed along the circumferential direction of the fire-spreading cylinder and are staggered between the upper and lower fire-spreading holes.

7. A dual stage pilot burner for liquid fuel and gas cooktops as claimed in claim 6 wherein: The fire-spreading holes are all inclined to be arranged along the same circumferential direction of the fire-spreading cylinder.

8. A dual stage pilot burner for liquid fuel and gas cooktops as claimed in claim 1, wherein: The secondary fire-spreading combustion cylinder is made of 301S stainless steel.

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