Patent Publication Number: US-2022218042-A1

Title: Smoking cartridge of gas heating smoking article and its smoking article

Description:
CROSS REFERENCE TO THE RELATED APPLICATIONS 
     This application is the national stage entry of International Application No. PCT/CN2020/092668, filed on May 27, 2020, which is based upon and claims priority to Chinese Patent Application No. 201920810783.8, filed on May 31, 2019, the entire contents of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The invention relates to a smoking cartridge of a smoking article heated by gas and a smoking article using the smoking cartridge, in particular, the smoking cartridge belongs to a smoking cartridge which is heat-not-burn, and is a substitute for traditional tobacco. 
     BACKGROUND 
     Traditional smoking articles, such as cigarettes, are cigarettes that are basically round or stick shaped cigarettes rolled around tobacco filaments with cigarette paper. In general, the cigarette mouth piece (smoking end) also has a filter, such as filter made of cellulose acetate. When smokers lit cigarettes and make breath, tobacco burning and carbonization formation in cigarette smoke without a fire burning hot area, the gradually back to hot burning zone of high temperature air flow similar to its tobacco filaments effect distillation, and makes the volatile substances in tobacco filament that produce evaporation and visible aerosol formed under the inhaled air cooling, namely, white and light blue smoke. The nicotine in the smoke is absorbed into the blood through the respiratory tract and alveoli, stimulating nerve cells in the brain and producing the nicotine&#39;s characteristic pleasure. However, due to the decomposition and double decomposition reactions of various chemicals in tobacco during combustion, a large amount of tar and a variety of harmful substances can be produced, so enjoying the pleasure of low-harm nicotine and reducing tar and harmful substances has become a problem for tobacco manufacturers. In order to significantly improve the public health environment, reduce the harm of tobacco and the resulting legal conflicts, related technological improvements and scientific inventions are improving this situation. R. j. reynolds&#39; patents describe low-tar cigarettes with segmented carbon fuel burning elements, such as U.S. Pat. Nos. 9,220,301, 9,149,072, and Phillip Morse&#39;s U.S. Pat. No. 9,185,939, which also discloses the technology. 
     There are many patents about heat-not-burn electronic cigarettes domestic and overseas. Aiming at the lighting method of cigarettes, China invention patent CN204682514U discloses a filter cigarette holder with a lighter. Through a fixed frame, the cigarette and the lighter are fixed together for the convenience of smokers. However, since the cigarette needs to be lit directly with the lighter, the harmful substances produced by burning the cigarette need to be done through a filter. China invention patent CN1328992C discloses a smoke simulator and its fuel element, which uses clean combustion fuels, such as ethanol, methanol, isopropyl alcohol or propanol. 
     In October 2016, the inventor also applied for the Chinese invention patent of “a gas-heated smoking article” which uses the premixed combustion of butane gas and air as energy, and the patent number is ZL201621111124.8. These patents are designed to provide smokers with low-tar cigarettes that have the advantages of traditional cigarettes, with as little incomplete combustion and pyrolysis as possible. Thus, heating not start combustion products in the world tobacco market temporarily outcrop, Philip Morse recently invented a lithium battery power supply heating by low temperature cigarettes, it makes cigarettes without burning only by the electric heating oven to produce smoke aerosol for smokers, greatly reduce the burning of double decomposition product. However, there are still some technical problems of many brands of e-cigarettes without ideal solutions, such as some inherent problems of lithium batteries, the amount of smoke is too small, the smoke attenuation is fast, the thermal inertia time is long. Makes many long-term smokers are difficult to accept. 
     Clearly, enjoying the pleasure of low-harm nicotine and reducing tar and harmful substances is a problem for tobacco manufacturers. In order to significantly improve the public health environment, reduce the harm of tobacco and the resulting legal conflicts, related technological improvements and scientific inventions are improving this situation. People have been looking for a cigarette substitute that can reduce the harmful substances produced by burning cigarettes and provide smokers with a good and convenient view of smoking. 
     SUMMARY 
     In order to solve the above problems, this invention aims to provide a replaceable smoking cartridge consumable for gas heating smoking articles. The smoking cartridge is heat-not-burn type, the vapor volume will not be attenuated, and the vapor volume can be generated in a sustainable way. It has a good sense of smoking and is highly similar to traditional cigarettes. 
     Another purpose of this invention is to provide a gas heating smoking article which uses the above-mentioned cigarette cartridge. 
     Based on the concept of this invention, preferably, the heat-not-burn smoking cartridge is applied to a smoking article heated by premixed gas and air combustion, that is, the heat generated by the combustion of propane or butane premixed gas is used to bake and heat the heat-not-burn smoking cartridge consumable, and produce a smoke very similar to the taste of traditional cigarettes. Achieve small thermal inertia, sustainable vapor volume. 
     To achieve the above purposes, this invention provides the following solutions: 
     This invention relates to a smoking cartridge of a gas-heated smoking article, including a heat-not-burn smoking body and a mouth piece. The smoking body is a column made of a heat-conducting metal foil covering tobacco and smoking liquid capsules. The smoking body is provided with an air inlet structure connected to the external air. During heating process of the smoking body, the smoke liquid capsules break or melt and releases the smoking liquid. The heat-conducting metal foil is preferably copper foil, aluminum foil or alloy foil, etc. 
     Furthermore, the cross section of the smoking body is circular or polygonal. 
     Furthermore, the inlet structure is the first air inlet path arranged in the rear segment of the smoking body. One end of the first air inlet path extends into the front segment of the smoking body, and the other end is connected to the first inlet vent on the side of mouth piece. 
     Furthermore, the first air inlet path is the first air inlet pipe, and one end of the first air inlet pipe is inserted into the smoking body, and the other end at least goes to the end of the smoking body, and is connected to the first air inlet vent on the side of the mouth piece. 
     Furthermore, the air inlet structure is a second air inlet path arranged in the front segment of the smoking body, and the external air flows in the front segment of the smoking body from the smoking body head. 
     Furthermore, the second air inlet channel is the second air inlet pipe, and the external surface of the head of smoking body is arranged with an air conduct cover. One end of the second air inlet pipe connected into the air conduct cover, and the external air enters into the second air inlet pipe through the air conduct cover. 
     Furthermore, the air conduct cover is made of porous heat-resistant material. 
     Furthermore, a number of heat transfer metal foils are mixed in the smoking body to form heat transfer from the outside to the inside of the smoking body. The heat transfer metal foils is preferably aluminum foil, copper foil, nickel foil, alloy foil and other metal foil. 
     Furthermore, the smoking liquid capsules are composed of a metal foil and the smoking liquid it is wrapped in. After being heated, the metal foil splits or melts to release the smoke liquid and increase the amount of vapor. The metal foil is preferably aluminum foil, tin foil, copper foil, nickel foil or alloy foil. 
     Furthermore, the tobacco, a number of heat transfer metal foils and a number of smoking liquid capsules are randomly mixed; the weight of the smoke liquid is between 0.1 mg and 100 mg. 
     As a replaceable consumable, the smoking cartridge mentioned above is particularly suitable for using in gas-heated smoking articles, including its housing, gas heating combustion device and smoking cartridge. 
     Furthermore, when the air inlet structure is a second air inlet path arranged in the front segment of the smoking body, the external surface of the smoking body is provided with an air conduct cover at the top, and one end of the second air inlet pipe goes into the air conduct cover. The housing down to the bottom of the combustion device is setting with diathermy hole inlet support, the inlet is equipped with at least one support rod on a support, the support rod with air path, its air imports corresponding to side walls of the second air inlet path on the housing, air outlet corresponding to air conduct cover stated, into the second air inlet pipe. 
     Further, the air inlet support is in the shape of wheel, and 1-4 support rods are arranged between the central column and the border. The air guide hood is accommodated in the central column. 
     Furthermore, the way the combustion device works is that the propane or butane gas and air are premixed and then burned. The heat generated by the combustion is used for baking and heating the smoking cartridge. The housing is provided with multiple emission exhaust vents. 
     Furthermore, the combustion device comprises an ignition device, a fuel tank, a gas control switch and a combustion chamber, which is provided with a combustion air inlet and a nozzle, and the gas after premixed with air, is ejected through the nozzle. 
     Furthermore, the combustion device and the smoking cartridge are arranged coaxially, and the smoking article as a whole is in the shape of a rod; or the housing of the combustion device protruding from the position of the smoking cartridge, and the shape of the smoking article is pistol type. 
     In the above technical solutions, this invention provides a low-temperature cigarette which is powered by the combustion of propane gas or butane gas to smokers who are difficult to quit smoking, and can produce a very similar smoke with the taste of ordinary cigarettes. As heat-not-burn is without burning smoke shot, can reduce the traditional cigarettes harmful because of tobacco burning and thermal cracking, without following traditional cigarette burning harmful material such as tar, carbon monoxide, ash, no dangers of secondhand smoke to others, also won&#39;t pollute the environment, which will greatly reduce the harm of traditional tobacco products. 
     Considering that propane and butane gas will produce exhaust gas in the combustion process, this technical solution designs a separate exhaust vent which is not connected to the mouth piece in the chamber of baking or heating consumable material, so as to protect the health of smokers. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The following schematic drawing can be better understood by referring to the embodiment, which is illustrative and does not impose any restrictions on the technical solution of this invention. In particular, the structure, proportion and size drawn in the attached drawings are only used to coordinate with the contents of the instruction manual for people familiar with the technology to understand and read, and are not used to limit the feasibility of the invention. 
         FIG. 1  is a structural schematic drawing of embodiment 1 of the smoking article of the invention. The drawing shows smoking articles that have been inserted with smoking cartridge. The smoking body of the cartridge is bullet-shaped; 
         FIG. 2  is a 3D drawing of the smoking cartridge embodiment 1 of this invention; 
         FIG. 3  is the longitudinal profile view of the smoking cartridge as shown in  FIG. 2 ; 
         FIG. 4  shows an A-A section view in  FIG. 3 ; 
         FIG. 5  is the 3D drawing of the smoking cartridge embodiment of this invention; 
         FIG. 6  is the transverse section view of the smoking cartridge embodiment 2 of this invention; 
         FIG. 7  is the 3D drawing of the smoking cartridge embodiment 3 of this invention; 
         FIG. 8  is the cross-section view of the smoking cartridge embodiment 3 of this invention; 
         FIG. 9  is the cross-section view of the smoking cartridge embodiment 4 of this invention; 
         FIG. 10  is the structural schematic view of embodiment 2 of the smoking article of this invention. The picture shows smoking articles that have been inserted with cartridge. The smoking cartridge embodiment 5 is cylindrical; 
         FIG. 11  is the longitudinal view of the smoking cartridge embodiment 5 as shown in  FIG. 10 ; 
         FIG. 12  is a 3D view of an embodiment of this invention&#39;s air inlet support; 
         FIG. 13  is a 3D view of another angle of the embodiment of this invention&#39;s air inlet support; 
         FIG. 14  is the section view of the air inlet support; 
         FIG. 15  is a 3D view of the smoking cartridge embodiment 6 of this invention; 
         FIG. 16  is a 3D view of the smoking cartridge embodiment 7 of this invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     This invention is further described in detail below in combination with the attached drawings and the specific embodiments. 
     As shown in  FIGS. 1-3 , this invention provides a smoking article that substitutes for cigarettes by means of gas heating, including a housing  10 , a combustion device  11  arranged in the housing, and a heat-not-burn smoking cartridge  12 . The side wall of the housing  10  is provided with multiple exhaust vents  101 , which are used for emitting the exhaust gas generated after combustion. Smoking cartridge  12  is composed of smoking body  121  and mouth piece  122 , among which, smoking cartridge  12  is provided with an air inlet path, and air inlet  123  is set on the side wall of mouth piece  122 , from which the external air enters, through air path  124 , by smoking body  121  enters from the rear segment. 
     Housing  10  is about round or flat, made of heat-resistant resin, glass, metal and other materials. It is mainly used for holding combustion device  11  and smoking cartridge  12 , and can be used for hand holding. In order to avoid excessive temperature on the outer surface of the housing  10 , the inner wall of the housing  10  is provided with an heat insulating layer  13 , which can be an insulating material with a certain thickness, such as microporous ceramics, silicon aerogels, etc., or an insulating coating coated on the inner wall. As an option, the housing  10  can also be an aluminum silicate or metal vacuum sleeve with a hollow interlayer for good insulation. 
     According to the volume of the heat-not-burn smoking cartridge, the corresponding baking chamber  14  was designed. In this embodiment, the housing  10  is equipped with a baking chamber  14  around the housing  12 , and the premixed flame of the combustion device  11  is directly facing to the baking chamber  14  to achieve the baking smoking cartridge  12 . There is no gas flow between baking chamber  14  and mouth piece  122 . 
     The combustion mode and structure of the combustion device  11  may be of any suitable structure in the available technology. As a kind of optimization, combustion device  11  with propane gas or butane gas fire for the premixed combustion material type, namely the propane and butane gas and air to mix into a premixed gas after combustion, heat produced by combustion is used for baking smoking cartridge  12 , when users smokes, the ignition and combustion of basic structure is the same as air premixed type cigarette lighter. The working of the premixed lighters is that the fuel gas and air mix first and then burn, the technicians in this field are aware that the premixed lighters are a mature technology in the existing technology. This invention does not make any limitation on the basic structure of premixed lighters, but only makes necessary improvements to the configuration of its external structure, premixed chamber, nozzle and other parts that need to be matched with smoking articles when it is used as a combustion device for baking smoking cartridge. The combustion mode and structure have been described in the China invention patent ZL201621111124.8 of the inventor. 
     As shown in  FIG. 1 , the main components of the combustion device  11  are consisted of the ignition device  111  and the fuel chamber  112 , as well as the inflatable port control switch  113  and the combustion chamber  114 . The combustion chamber  114  is made of heat-resistant ceramic and is equipped with the combustion air inlet  115  and the nozzle  116 , and the flame after premix with the air is ejected through the nozzle. In a more advantageous implementation, fire proofing mesh  117  is arranged around the combustion chamber  114  to avoid premixed gas deflagration. 
     As the ignition device  111  actives, an arc shoots into the combustion chamber  114 , igniting the gas. Common ignition devices  111  have piezoelectric ceramic elements, magnetic induction, batteries and so on. Taking the ignition of piezoelectric ceramics as an example, under the action of mechanical stress, the piezoelectric ceramics cause the relative displacement of the positive and negative charge centers inside to polarize, resulting in the binding charges with opposite charges at the two surfaces of the material. Therefore, when the piezoelectric ceramic element is subjected to impact pressure, the mechanical energy is converted into electrical energy, and a transient high-voltage electric arc is released at the tip to ignite the fuel. 
     As shown in  FIGS. 2-4 , heat-not-burn smoking cartridge  12  is a replaceable consumable, consisting of  121  smoking body and  122  mouth piece. 
     Smoking body  121  is made of thermal conductive metal foil  1210  covering tobacco  1211 , finely broken heat transfer metal foils  1212  and smoking liquid capsules  1213 . The smoking body  121  is provided with an air inlet structure connected to the external air, preferably the inlet pipe  1214  located at the rear segment and the central axis of smoking body  121 . One end of the inlet pipe  1214  is located at the front segment of the smoking body, and the other end passes through the bottom end of smoking body  121 . Further, preferably, the inlet pipe  1214  inhale cool air to condense aerosol during smoking and will melting property and a seal when overheated. 
     The thermal conductivity of metal foil  1210  optimized are copper foil, aluminum foil, or gold foil, can rise to outside-in heat transfer effect. In this embodiment, the thermal conductive metal foil  1210  is rolled into a circular section. 
     In order to achieve a good experience of smoking and to accelerate the heat-not-burn rate of the smoking cartridge, a number of fine heat transfer metal foils  1212  are mixed in the smoking body  121 . These mixed heat transfer metal foils can appear as small fragments or small narrow strips and are mainly used to conduct heat from the outside to the inside of the smoking body during heating. The heat transfer metal foils are preferably aluminum foil, copper foil and gold foil. 
     Preferably, tobacco  1211  is tobacco filaments and/or tobacco flake filaments that are heated to provide mainstream vapor. The tobacco  1211 , the fine heat transfer metal foils  1212  and several smoking liquid capsules  1213  are randomly mixed and placed in the space formed by thermal conductive metal foil  1210  and the inlet pipe  1214 . 
     The smoking cartridge mouth piece  122  is placed on the central axis of the smoking body  121  and made of plastic material. The side of the mouth piece  122  is provided with an air inlet path  123 , which is connected to the air inlet  1214  along the air inlet  124 . The external air enters the air inlet  1214  from the air inlet vent  123 . Preferably, the mouth piece is equipped with filter tip  125 , which can be used to filter out the solid particles in the inhaled smoke. The filter elements can be made of common acetate cellulose, polyester mesh, polypropylene mesh, polylactic acid (PLA) fiber bundles and other materials. 
     Preferably, the section of smoking body  121  can also be a polygon to provide the maximum surface area to absorb the heat generated from the combustion. For example, as shown in  FIGS. 5 and 6  of the smoking cartridge  22 , including smoking body  221 , mouth piece  222 , metal foil  2210  warped with tobacco  2211 , fine heat transfer metal foils  2212  and smoking liquid capsules  2213 , inlet pipe  2214  is located in the center axis, mouth piece  222  side is equipped with inlet vent  223 , compare to the implement case  1  the difference is that the smoking body  221  cross section is three edges of column of the smoking cartridge. As shown in  FIGS. 7 and 8 , smoking cartridge  32 , including smoking body  321 , mouth piece  322 , heat transfer foil  3210 , tobacco  3211 , fine heat transfer metal foils  3212  and smoking liquid capsules  3213 , inlet pipe  3214  is located in the center axis, mouth piece  322  side is equipped with inlet vent  323 , and the difference of implement case  1  is that the smoking body  321  has six column of edges and corners. Smoking cartridge  42 , as shown in  FIG. 9 , shows a cylindrical smoking body  421  with a flat rectangular section. The smoking body  421  is equipped with an inlet pipe  4214 . The metal foil  4210  warps the tobacco  4211 , the fine heat transfer metal foils  4212  and the smoke liquid capsules  4213 . 
     The smoke liquid capsules used by this invention are  1213 ,  2213 ,  3213  and  4213 , which are mature technologies, and is a kind of microcapsule product that covers the smoking liquid. The smoking liquid refers to a kind of smoking liquid that can form aerosol after evaporation cooling, and can be applied to any kind of smoking liquid product in tobacco products by using prior art, such as the smoking liquid used in e-cigarette. Can understand is, smoking liquid is generally divided into two categories, category contains nicotine, category does not contain nicotine, the main components including propylene glycol, glycerin, nicotine and tobacco extract, spices, such as ethanol, the cigarette flavor, such as sweeteners, aloes, mint, liquorice, essence, etc., to change the taste of cigarettes or flavor; As a preferred option, nicotine and/or tobacco extracts can also be added as appropriate to the product. 
     Preferably, the smoking liquid is wrapped and capsuled by metal foil, which could be aluminum foil, tin foil, copper foil, nickel foil or alloy foil. The smoking liquid weight is between 0.1 mg and 100 mg. Smoking liquid capsules  1213 ,  2213 ,  3213 , and  4213  can increase the amount of vapor after thermal rupture. The smoking liquid package  1213 ,  2213 ,  3213  and  4213  are sealed with aluminum foil is exploded at high temperature due to the vaporization pressure to release the vapor. The smoking liquid capsules of  1213 ,  2213 ,  3213  and  4213  sealed with tin foil releases smoke due to the melting of the tin foil at high temperature. From this, in the heating process of the smoking body, the smoking liquid capsules  1213 ,  2213 ,  3213  and  4213  release the vapor due to the cracking or melting of the metal foil. 
     The patent applications submitted by the inventor before this date include China invention patent ZL2016204193031/Publication No. CN205695718U and international patent application No. PCT/CN2016/096011, which record the structure of microburst microcapsule and the composition of aerosol generator (smoke liquid) in the capsule, which are quoted here in full text. The smoke liquid capsule  1213  of the invention can use any of the suitable microburst microcapsules described in the above patent application. 
     From the point of view of product design, the combustion device  11  and the heat-not-burn smoking cartridge  12  can be coaxially placed, and the smoking article as a whole is in the shape of a rod, as shown in  FIG. 1 . As an option, the combustion device can also be used to protrude from the axis of the heat-not-burn smoking cartridge consumable, and the shape of the smoking article is pistol type. 
     When in use, the heat-not-burn smoking cartridge  12  is first inserted into the housing  10 , then the ignition device  111  is pressed, and the butane stored in the fuel tank  112  is premixed and burned in the combustion chamber  114 . The range of the combustion zone is defined inside the fire insulation mesh  117 . Smoking cartridge  12  is heated at a high temperature in the baking chamber  14 , among which tobacco  1211 , fine heat transfer metal foils  1212  and smoke liquid capsules  1213  are the first to release smoke. When smoking, the external air enters through the air inlet vent  123 , inlet path  124  and the air inlet pipe  1214 , and is sucked out through the filter tip  125 . With the increase of smoking frequency, the temperature in the smoking cartridge consumables increased centripetal and the tobacco  1211 , the fine heat transfer metal foils and the smoking liquid capsules  1213  were heated and atomized to produce vapor. When most tobacco  1211 , fine heat transfer metal foils  1212  and smoking liquid capsules  1213  were consumed, the inlet pipe  1214  melted and closed due to high temperature, and smoking process stopped. The combustion exhaust gas produced in the process of smoking is emitted from the exhaust vent  101 . Since there is no gas flowing between baking chamber  14  and filter tip  125 , smokers do not inhale exhaust gas. After smoke, remove the toasted cartridge  12  and discard. 
     As shown in  FIGS. 11-14 , this invention provides another optimal solution for heat-not-burn smoking articles by using gas heating. The main improvement is that external air is introduced from the head of the smoking body. 
     Smoking articles include a housing  50 , a combustion device  51  installed in the housing and a heat-not-burn cartridge  52 . The side wall of the shell  50  is provided with a plurality of exhaust vents  501 , which are used to emit the exhaust gas generated after combustion. Smoking cartridge  52  is composed of smoking body  521  and mouth piece  522 , smoking cartridge mouth piece  522  is placed on the axis of smoking body  521 , made of plastic material, preferably, the mouth piece is equipped with filter  525 , which can be used to filter out the solid particles from the inhaled vapor. 
     The smoking cartridge  52  is provided with an air inlet path, the external air inlet  502  is arranged on the side wall of the housing  50 . The external air enters through the front end of the smoking body  521 . 
     The housing  50  is about round or flat, and the inner wall of the housing  50  is provided with a heat insulating layer  53 . 
     The housing  50  is equipped with a baking chamber  54  around the cartridge  52 , and the premixed flame of the combustion device  51  is directly facing the baking chamber  54  to achieve the baking of the cartridge  52 . There is no gas flow between the baking chamber  54  and filter tip  525 . 
     Combustion device  51  is basically the same structure as described in embodiment 1; including ignition device  511  and fuel tank  512 , inflatable gas control switch  513 , combustion chamber  514 , combustion air inlet  515  and nozzle  516 , and fire insulation mesh  517  around combustion chamber  514 . 
     tobacco  5211 , the fine heat transfer metal foils  5212  and liquid capsules  5213  are warped in thermal conductive metal foil  5210 , smoking body  512  in a rod shape. Smoking body  521  is designed with external air inlet structure, preferably place air inlet pipe  5214  along the axis of smoking body  521 . Air inlet pipe  5214  inserted from head of smoking body  521  along its axis. Outside the smoking body  521  designed with a rod shape air conduct cover  57 , preferably made of porous heat resistant material. External air flows through air conduct cover  57  into air inlet pipe  5214 , while inhaling air to condense aerosols. 
     As shown in  FIGS. 10 and 12-14 . In order to conduct the external air into the air conduct cover  57 , the air conduct cover  57  is matched with an air inlet support  55  fixed in the housing  50 . Specifically, the housing  50  is set in the below of the combustion device with diathermy hole  551 , inlet support  55 , use a metal or ceramic, it is roughly wheel shape, 1-4 support bar  552 , three support bar is adopted in this invention, one of the coarser the support bar  552  designed with air path  553 , its gas inlet vent corresponding to housing  50  side walls is inlet vent  502 , gas exhaust is aimed at air conduct cover  57 . Preferably, the center of the air inlet support  55  is provided with a receptacle slot  554  for the air conduct cover  57 . The external air flow into the air conduct cover  57  through the path  553  inside the support rod  552  and enters into the air inlet pipe  5214 . 
     Thermal conductive metal foil  5210  is preferably aluminum foil or alloy foil and other metal foil. In this embodiment, the rolled section of foil  5210  is circular. Preferably, the section can be a polygon to provide the maximum surface area to absorb the heat from the premixed flame. For example, the smoking cartridge  62  shown in  FIG. 15  consists of the smoking body  621 , the mouth piece  622  and the air conduct cover  67 . The difference between the smoking body  621  and the previous embodiment is that the smoking body  621  is a cylindrical smoking body with a cross-section of three angles. The smoking cartridge  72 , as shown in  FIG. 16 , consists of the smoking body  721 , the mouth piece  722  and the air conduct cover  77 . The section of the smoking body  721  shows six angles. 
     The invention is not limited to the implementation method discussed above. The above description of the specific implementation method aims to explain and explain the technical scheme involved in the invention. The specific implementation method mentioned above is used to reveal the optimal implementation method of the invention, so that ordinary technicians in the field can apply multiple implementation methods of the invention and various alternative methods to achieve the purpose of the invention. The obvious transformation or substitution based on the revelation of the invention shall also be considered to fall into the protection scope of the invention.