Multi-stage temperature control method, multi-stage heating device and computer readable storage medium

Abstract

The present invention provides a multi-stage temperature control method and a multi-stage heating device, the temperature control method is used to control the heating process of the multi-stage heating device, the multi-stage heating device includes a heating chamber and a plurality of heating elements arranged in sequence from top to bottom, the uppermost heating element is a first heating element, the temperature control method includes: the heating process of each heating element independently includes three stages, in the first stage, the heating element is heated from an initial temperature to a first target temperature; in the second stage, the heating element maintains the first target temperature; in the third stage, the heating element is cooled from the first target temperature to a second target temperature, wherein the start and end time of the second stage of any heating element below is later than the start and end time of the second stage of the heating element above it, and the first target temperature of the first heating element is lower than the first target temperature of other heating elements. The present invention also discloses a computer-readable storage medium.

Description

Technical Field

[0001] The present invention relates to the field of tobacco technology, and in particular to a multi-stage temperature control method, a multi-stage heating device and a computer-readable storage medium. Background Art

[0002] Compared with heat-not-burn cigarettes, traditional cigarettes require higher temperatures to produce smoke efficiency sufficient for smoking when they are only heated but not burned. However, due to the size of heat-not-burn devices, the battery power and output power of heat-not-burn devices are not enough to provide high heat to heat the entire smoking unit at the same time, so segmented heating is needed to reduce the requirements on the battery.

[0003] The prior art discloses a variety of segmented heating smoking devices for specially formulated heat-not-burn cigarettes, such as Reference 1 (WO2019173938A1) and Reference 2 (WO2020181518A1). However, the smoking devices in these patents are specially designed for heat-not-burn cigarettes. Since there is no reasonable heating temperature curve designed specifically for traditional cigarettes, it will cause problems such as low tobacco utilization, slow smoke response speed, and uneven smoke volume per puff.

[0004] Therefore, how to provide a multi-stage temperature control method and multi-stage heating equipment suitable for traditional cigarettes has become a technical problem to be solved urgently in this field. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-stage temperature control method and a multi-stage heating device suitable for traditional cigarettes. The multi-stage temperature control method and the multi-stage heating device can be used to heat traditional cigarettes and generate smoke, thereby improving tobacco utilization and smoke response speed, and the amount of smoke in each puff is uniform and the smoking taste is good.

[0006] In order to solve the above problems, the present invention provides a multi-stage temperature control method for controlling the heating process of a multi-stage heating device, wherein the multi-stage heating device comprises a heating chamber and a plurality of heating elements, wherein the plurality of heating elements are arranged in sequence from top to bottom along the axial direction of the heating chamber, and the uppermost heating element is a first heating element. The temperature control method comprises:

[0007] The heating process of each heating element independently includes three stages. In the first stage, the heating element is heated from the initial temperature to the first target temperature; in the second stage, the heating element maintains the first target temperature; in the third stage, the heating element is cooled from the first target temperature to the second target temperature.

[0008] The start time of the second stage of any of the lower heating elements is later than the start time of the second stage of the heating element above it, and the end time of the second stage of any of the lower heating elements is also later than the end time of the second stage of the heating element above it.

[0009] And the first target temperature of the first heating element is lower than the first target temperatures of the other heating elements.

[0010] With the above technical solution, the first heating element located at the top is heated first, and the generated smoke needs to flow through the shortest path, which improves the response speed of the smoke; and the first target temperature of the first heating element is set lower than the first target temperature of other heating elements, reducing the smoke temperature entering the mouth. The first target temperature of other heating elements except the first heating element is relatively high, which can ensure that the smoke has a relatively high temperature when it is transmitted to the heating area corresponding to the first heating element, avoiding the smoke from being condensed and adsorbed by the tobacco in the heating area corresponding to the first heating element, while continuously promoting the release of smoke in the heating area corresponding to the first heating element, thereby improving the tobacco utilization rate. Multi-stage heating also makes the amount of smoke in each puff more uniform.

[0011] According to another specific embodiment of the present invention, the first target temperature of the first heating element is 170-280°C, and the first target temperatures of other heating elements are independently 280-400°C.

[0012] According to another specific embodiment of the present invention, the second stage of any one of the lower heating elements starts after the second stage of its adjacent upper heating element ends.

[0013] According to another specific embodiment of the present invention, the other heating elements except the first heating element include two heating processes in the first stage. In the first heating process, the temperature is firstly increased to the preheating temperature. After the second stage of the adjacent upper heating element is completed, the second heating process is started, and the temperature is increased from the preheating temperature to the first target temperature.

[0014] According to another specific embodiment of the present invention, the preheating temperatures of the heating elements other than the first heating element are independently 170-250°C.

[0015] According to another specific embodiment of the present invention, except for the heating element at the lowest end along the axial direction of the heating chamber, the heating process of the other heating elements further includes a fourth stage, in which the temperature of the heating element is maintained at the second target temperature.

[0016] According to another specific embodiment of the present invention, except for the heating element at the lowest end along the axial direction of the heating chamber, the second target temperatures of other heating elements are independently 170-280°C.

[0017] According to another specific embodiment of the present invention, except for the heating element at the lowest end along the axial direction of the heating chamber, the second target temperature of any heating element below is greater than the second target temperature of the heating element above it.

[0018] According to another specific embodiment of the present invention, except for the heating element at the lowest end along the axial direction of the heating chamber, the second target temperature difference between two adjacent heating elements above and below is 10-50°C.

[0019] According to another specific embodiment of the present invention, the number of the plurality of heating elements is four.

[0020] According to another specific embodiment of the present invention, a multi-stage heating device comprises:

[0021] Heating chamber;

[0022] A plurality of heating elements, wherein the plurality of heating elements are sequentially arranged from top to bottom along the axial direction of the heating chamber, and the uppermost heating element is a first heating element;

[0023] The temperature control circuit is used to control the heating process of the multi-stage heating device according to any of the above-mentioned temperature control methods.

[0024] According to another specific embodiment of the present invention, the heating element is a heating film.

[0025] According to another specific embodiment of the present invention, it also includes a heat conducting pipe, a heating cavity is formed in the heat conducting pipe, and a plurality of heating elements are surrounded on the outer wall of the heat conducting pipe.

[0026] According to another specific embodiment of the present invention, it also includes a suction nozzle, which is arranged at one end close to the first heating element, and an opening is formed at the lower end of the heat-conducting tube for inserting tobacco products.

[0027] According to another specific embodiment of the present invention, the lower end of the heat conducting pipe extends out from the plurality of heating elements to form an extension section.

[0028] According to another specific embodiment of the present invention, the present invention further provides a computer-readable storage medium, comprising:

[0029] The computer executable instructions stored therein, when the processor executes the computer executable instructions, control the multi-stage heating equipment to implement any of the above-mentioned temperature control methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] Figure 1 It is a temperature control curve provided by the present invention;

[0032] Figure 2 The invention provides a multi-stage heating device.

[0033] Figure Number:

[0034] Heat pipe 10

[0035] Heating chamber 11

[0036] Extension 12

[0037] First heating element 21

[0038] Second heating element 22

[0039] The third heating element 23

[0040] Fourth heating element 24

[0041] Vacuum tube 31

[0042] Buttons and keypads 32

[0043] Button bracket 33

[0044] Indicator light 34

[0045] Battery 35

[0046] Charging plate 36

[0047] Nozzle 37

[0048] Tobacco Section 41

[0049] Filter segment 42 DETAILED DESCRIPTION

[0050] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0051] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0052] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0054] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0055] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0056] like Figure 1 and Figure 2 As shown, the present invention provides a multi-stage temperature control method for controlling the heating process of a multi-stage heating device, wherein the multi-stage heating device includes a heating chamber 11 and a plurality of heating elements, wherein the plurality of heating elements are arranged along the axial direction (i.e. Figure 2 The heating element 21 is arranged in sequence from top to bottom (in the AA direction shown in the figure), and the uppermost heating element is the first heating element 21. The temperature control method includes:

[0057] The heating process of each heating element independently includes three stages. In the first stage, the heating element is heated from the initial temperature to the first target temperature; in the second stage, the heating element maintains the first target temperature; in the third stage, the heating element is cooled from the first target temperature to the second target temperature.

[0058] The start time of the second stage of any of the lower heating elements is later than the start time of the second stage of the heating element above it, and the end time of the second stage of any of the lower heating elements is also later than the end time of the second stage of the heating element above it.

[0059] And the first target temperature of the first heating element 21 is lower than the first target temperatures of other heating elements.

[0060] It is worth noting that the "upper" and "lower" in the "arranged in sequence from top to bottom along the axial direction of the heating chamber 11" in the present invention refer to when the multi-stage heating device is Figure 2 The upper and lower positions shown also represent when a smoker generally inhales, with the end closer to the smoker's lips being the upper end and the end farther from the smoker's lips being the lower end; that is, in a multi-stage heating device, the heating element through which the airflow flows last is the uppermost heating element, and the heating element through which the airflow flows first is the lowermost heating element.

[0061] With the above technical solution, the plurality of heating elements reach the first target temperature successively from top to bottom along the axial direction of the heating chamber 11, and the first heating element 21 located at the top is heated first. The smoke flow path in the tobacco segment 41 is as follows: Figure 2 As shown by the two single arrows in the figure, the smoke generated by the first heating element 21 needs to flow through a short path before being inhaled, which can improve the response speed of the smoke; and the first target temperature of the first heating element 21 is set to be relatively low, reducing the smoke temperature entering the mouth; the first target temperature of other heating elements is relatively high, which can ensure that the smoke is still at a relatively high temperature when it is transmitted to the heating area corresponding to the first heating element 21, continuously promoting the release of smoke in the heating area corresponding to the first heating element 21, and preventing the smoke from being condensed and adsorbed by the tobacco in the heating area corresponding to the first heating element 21, thereby improving the tobacco utilization rate. Multi-stage heating also makes the amount of smoke in each puff more uniform.

[0062] Taking a specific embodiment of the present invention as an example, Figure 1 The temperature curve of the heating device with four heating elements is shown, where a, b, c, and d respectively represent the temperature curves of the first heating element 21, the second heating element 22, the third heating element 23, and the fourth heating element 24. The first heating element 21, the second heating element 22, the third heating element 23, and the fourth heating element 24 are arranged in sequence from top to bottom along the axial direction of the heating chamber 11.

[0063] When working, for the first heating element 21, the temperature curve is as follows Figure 1 As shown in curve a, from t0 to t 11 During the time period, the first heating element 21 is in the first stage, and the first heating element 21 is heated from the initial temperature T0 to the first target temperature T 11 ; at t 11 to 12 During this time, the first heating element 21 is in the second stage and is maintained at the first target temperature T 11 ; at t 12 to 13 During this time, the first heating element 21 is in the third stage, from the first target temperature T 11 Cool down to the second target temperature T 12 .

[0064] For the second heating element 22, the temperature curve is as follows Figure 1 As shown in curve b, from t0 to t 21 During this time, the second heating element 22 is in the first stage, heating from the initial temperature T0 to the first target temperature T 21 (i.e., the time t at which the second heating element 22 starts the second stage 21 Later than the time t at which the second heating stage of the first heating element 21 starts 11 ); at t 21 to 22 During this time, the second heating element 22 is in the second stage and is maintained at the first target temperature T 21 (i.e., the time t at which the second heating element 22 ends the second stage 22 It is also later than the time t at which the second stage of the first heating element 21 ends. 12 ); 22 to 23 During this time, the second heating element 22 is in the third stage, from the first target temperature T 21 Cool down to the second target temperature T 22 .

[0065] For the third heating element 23, the temperature curve is as follows Figure 1 As shown in the c curve, from t0 to t 31 During this time, the third heating element 23 is in the first stage, heating from the initial temperature T0 to the first target temperature T 31 (i.e., the time t at which the second stage of the third heating element 23 begins 31 Later than the time t at which the second heating element 22 starts the second stage 21 ); at t 31 to 32 During this time, the third heating element 23 is in the second stage and is maintained at the first target temperature T 31 (i.e. the time t at which the second stage of the third heating element 23 ends 32 It is also later than the time t at which the second heating element 22 ends the second stage. 22 ); 32 to 33 During this time, the third heating element 23 is in the third stage, from the first target temperature T 31 Cool down to the second target temperature T 32 .

[0066] For the fourth heating element 24, the temperature curve is as follows Figure 1 As shown in the curve d, from t0 to t 41 During this time, the fourth heating element 24 is in the first stage, heating from the initial temperature T0 to the first target temperature T 41(i.e., the time t at which the second stage of the fourth heating element 24 begins 41 Later than the time t at which the second stage of the third heating element 23 starts 31 ); at t 41 to 42 During this time, the fourth heating element 24 is in the second stage and is maintained at the first target temperature T 41 (i.e., the time t at which the second stage of the fourth heating element 24 ends) 42 It is also later than the time t at which the second stage of the third heating element 23 ends. 32 ); 42 to 43 During this time, the fourth heating element 24 is in the third stage, from the first target temperature T 41 Cool down to the second target temperature T 42 .

[0067] Furthermore, the first target temperature of the present invention can be set according to the temperature of smoke released by the heated tobacco product, so that the heated tobacco segment 41 can generate sufficient smoke at the first target temperature. Generally speaking, the tobacco segment 41 of a traditional cigarette will have a small amount of smoke overflow when it is greater than 170°C. As the temperature increases, the amount of smoke overflow increases. The specific first target temperature range can be determined according to the senses of the smoker. In one embodiment of the present invention, the first target temperature of the first heating element 21 can be set to 170~280°C, preferably 180~250°C, and more preferably 190~220°C; the first target temperatures of other heating elements are independently set to 280~400°C, preferably 300~350°C. The first target temperatures of other heating elements can be the same or different. Preferably, the first target temperatures of other heating elements increase from top to bottom, and the heat of the smoke generated by the lower heating element continuously heats the upper tobacco segment 41, thereby improving the utilization rate of tobacco.

[0068] Furthermore, in order to ensure the uniformity of the smoke volume, except for the heating element at the bottom, the second target temperature of other heating elements should be greater than the critical temperature of smoke release from the heated tobacco product. At the end of the third stage, the temperature of the adjacent heating element below any upper heating element should be greater than the temperature of the upper heating element at this time.

[0069] Furthermore, the time intervals of the second phases of the plurality of heating elements may partially overlap, that is, the second phase of the second heating element 22 below the first heating element 21 may begin before the second phase thereof ends. In order to reduce the energy required for heating, the second phases of the plurality of heating elements may not overlap, that is, the second phase of any one of the lower heating elements begins after the second phase of the adjacent upper heating element ends.

[0070] like Figure 1 Taking the temperature curve of the heating device with four heating elements as an example, the time t at which the second heating element 22 starts the second stage 21 Later than the time t at which the second stage of the first heating element 21 ends 12 The time t at which the second stage of the third heating element 23 begins 31 Later than the time t at which the second heating element 22 ends the second stage 22 ; The time t at which the second stage of the fourth heating element 24 begins 41 Later than the time t at which the second stage of the third heating element 23 ends 32 .

[0071] In addition, those skilled in the art can foresee that before any heating element is cooled to the critical temperature for the release of smoke from the heated tobacco product (above this critical temperature, the heated tobacco product will release smoke, and below this critical temperature, the smoke generated by the heated tobacco product can be ignored), its adjacent lower heating element should be heated to above the critical temperature.

[0072] Furthermore, in the first stage, the other heating elements except the first heating element 21 may start heating up at the same time as the first heating element 21 and gradually heat up to their respective first target temperatures; or they may start heating up later than the first heating element 21. Preferably, the first stage includes two heating processes. In the first heating process, the temperature may be firstly raised to the preheating temperature, and after the second stage of the adjacent upper heating element is completed, the second heating process may be started to raise the temperature from the preheating temperature to the first target temperature. Figure 1 As shown, the first stage of the second heating element 22, the third heating element 23 and the fourth heating element 24 includes two heating processes. Taking the temperature curve c of the third heating element 23 as an example, before the second stage of the second heating element 22 ends (i.e., t 22 Before the moment), the third heating element 23 is first heated to the preheating temperature T 31' , after the second stage of the second heating element 22 ends (ie, t 22 After the moment), the second heating process starts immediately, and the third heating element 23 is heated to its first target temperature T 31 This allows the rear heating element to heat up to the first target temperature more quickly, with a more consistent temperature connection, more stable smoke stimulation, and a more uniform smoke volume.

[0073] Furthermore, in a preferred embodiment of the present invention, the preheating temperature can be set between 170 and 250° C. This allows a small amount of smoke to overflow from the tobacco segment 41 in the first stage to supplement the amount of smoke.

[0074] Furthermore, except for the heating element at the lowest axial end of the heating chamber 11, the heating process of the other heating elements also includes a fourth stage, in which the temperature of the heating element is maintained at the second target temperature. Figure 1 As shown, except for the fourth heating element 24, the first heating element 21, the second heating element 22 and the third heating element 23 are maintained at their respective second target temperatures after the third stage. On the one hand, smoke condensation can be avoided, and on the other hand, the tobacco utilization rate of the tobacco segment 41 in the heating area corresponding to the upper heating element can be improved.

[0075] More preferably, the second target temperature of any one of the lower heating elements is greater than the second target temperature of the heating element above it, such as Figure 1 As shown in FIG. , the second target temperature T of the third heating element 23 32 >The second target temperature T of the second heating element 22 22 >The second target temperature T of the first heating element 21 12 This can transfer the heat from the bottom to the top to avoid smoke condensation. On the other hand, by setting the second target temperature of the uppermost heating element to the lowest, the smoke temperature can be prevented from being too high and burning the mouth.

[0076] Further, after the second stage of the bottom heating element ends, the entire heating element stops heating, and the third stage of the bottom heating element can be naturally cooled to room temperature, so there is no limitation on the second target temperature of the bottom heating element, such as Figure 1 The four-stage heating temperature curve shown in FIG. 1 shows a second target temperature T of the fourth heating element 24. 43 It can be room temperature, or the critical temperature of tobacco smoke release, or any temperature lower than the first target temperature T of the fourth heating element 24. 41 temperature.

[0077] For heating elements other than the bottom heating element, the second target temperature of the present invention can also be determined according to the specific tobacco product being heated. Generally speaking, when the tobacco segment 41 of a traditional cigarette is greater than 170°C, a small amount of smoke will overflow, so issues such as tobacco utilization and power consumption are comprehensively considered. Preferably, the second target temperature of heating elements other than the bottom heating element is independently 170~280°C, and the second target temperature difference between the upper and lower adjacent heating elements is 10~50°C.

[0078] Furthermore, the total time of a complete smoking process is 180-300 seconds, the first stage duration of the first heating element 21 can be 30-50 seconds, and the start and duration of the second stage of multiple heating elements can be determined according to the amount of smoke generated by the tobacco segments 41 heated by each heating element. When the amount of smoke generated by the upper heating element in the second stage is insufficient, the lower heating element starts the second stage. The more heating elements there are, the shorter the tobacco segment 41 heated by each heating element, and the shorter the duration of the second stage of each heating element.

[0079] by Figure 1 For example, the total time of a complete suction process is from the time t0 when the first heating element 21 starts to heat up to the time t0 when the second stage of the fourth heating element 24 ends. 42 , a total of 220 seconds; the first stage duration of the first heating element 21 is 40 seconds.

[0080] Furthermore, the tobacco product of the present invention can be a traditional cigarette. Traditional cigarettes include thick cigarettes, medium cigarettes and thin cigarettes. Even when heated at high temperatures, thick cigarettes still have the problem of being difficult to fully stimulate the smoke of the tobacco segment 41, and the tobacco utilization rate is low, while the smoke volume of thin cigarettes is too small. Therefore, the multi-stage heating device in the present invention is more suitable for medium cigarettes.

[0081] Preferably, the plurality of heating elements is 4. When 4 heating elements are used, the smoke in the medium cigarette can be efficiently stimulated while ensuring a uniform smoke volume.

[0082] According to another specific embodiment of the present invention, a multi-stage heating device is also disclosed, such as Figure 2 As shown, including:

[0083] Heating chamber 11;

[0084] A plurality of heating elements, which are arranged in sequence from top to bottom along the axial direction of the heating chamber 11, and the uppermost heating element is the first heating element 21;

[0085] The temperature control circuit is used to control the heating process of the multi-stage heating device using any of the aforementioned temperature control methods.

[0086] By adopting the above technical solution, multiple heating elements reach the first target temperature in sequence from top to bottom along the axial direction of the heating chamber 11. The first heating element 21 located at the top is heated first, and the generated smoke needs to flow through the shortest path, which improves the response speed of the smoke; and the first target temperature of the first heating element 21 is set to be lower than the first target temperature of other heating elements, so as to reduce the inlet smoke temperature. The first target temperature of other heating elements except the first heating element 21 is relatively large, so that it can be ensured that the heating area corresponding to the smoke transmission to the first heating element 21 still has a relatively high temperature, so as to avoid the smoke being condensed and adsorbed by the tobacco in the heating area corresponding to the first heating element 21, and at the same time continuously promote the smoke release in the heating area corresponding to the first heating element 21, so as to improve the tobacco utilization rate. Multi-stage heating also makes the amount of smoke in each puff more uniform.

[0087] Furthermore, the multi-stage heating device also includes a heat pipe 10, a heating chamber 11 is formed in the heat pipe 10, and a plurality of heating elements surround the outer wall of the heat pipe 10. A vacuum tube 31 is also sheathed outside the heat pipe 10 to play a role in heat preservation and insulation.

[0088] Furthermore, the multi-stage heating device also includes an indicator light 34, a button and a button panel 32, a button bracket 33, a battery 35, a charging panel 36, etc., which are used to realize functions such as charging, input and output, and support.

[0089] Furthermore, the heating element may adopt heating methods such as resistance heating and electromagnetic heating, and the resistance heating may be through a heating coil, a heating film, etc. The heating element is preferably a heating film, which heats more evenly.

[0090] Furthermore, when the tobacco product is a conventional cigarette, since there is no cooling section in the tobacco segment 41 and the filter segment 42, if the smoke is inhaled through the filter, the heated smoke generated by the tobacco segment 41 will directly enter the filter segment 42, causing the filter tow to melt and produce an unfavorable odor. Therefore, in a preferred embodiment of the present invention, Figure 2 As shown, the multi-stage heating device further includes a suction nozzle 37, which is arranged at one end close to the first heating element 21, and the lower end of the heat-conducting tube 10 forms an opening for inserting tobacco products. When heating a traditional cigarette, the end where the tobacco segment 41 is located is inserted into the heating chamber 11, and the filter segment 42 serves as an air inlet, which can prevent the heated smoke from passing through the filter segment 42.

[0091] The lower end of the heat conducting pipe 10 extends from the plurality of heating elements to form an extension section 12, and the outer side of the extension section 12 is not wrapped with a heating element. When heating a conventional cigarette, the portion below the tobacco section 41 and the portion above the filter section 42 can be wrapped by the extension section 12. Although this will reduce the utilization rate of the tobacco, the heat extraction portion of the heating element can be used to preheat the air flowing through the filter, thereby avoiding the direct inhalation of cold air and causing the temperature of the heating area to drop. At the same time, the heat can be extracted, reducing the requirements for the insulation of the heating area.

[0092] Furthermore, the present invention also discloses a multi-stage heating system, comprising any of the aforementioned multi-stage heating devices and a tobacco product. The tobacco product is preferably a traditional cigarette, more preferably a slim cigarette.

[0093] According to another specific embodiment of the present invention, the present invention further provides a computer-readable storage medium, comprising:

[0094] The computer executable instructions stored therein, when the processor executes the computer executable instructions, control the multi-stage heating equipment to implement any of the above-mentioned temperature control methods.

[0095] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A multi-stage temperature control method, characterized in that: The method is used to control the heating process of a multi-stage heating device, wherein the multi-stage heating device comprises a heating chamber and a plurality of heating elements, wherein the plurality of heating elements are arranged in sequence from top to bottom along the axial direction of the heating chamber, wherein the end close to the lips of the smoker is the top, and the end away from the lips of the smoker is the bottom, and the uppermost heating element is the first heating element, wherein the temperature control method comprises: The heating process of each heating element independently includes three stages. In the first stage, the heating element is heated from the initial temperature to the first target temperature; in the second stage, the heating element maintains the first target temperature; in the third stage, the heating element is cooled from the first target temperature to the second target temperature. The heated tobacco product can generate a sufficient amount of smoke at the first target temperature, the start time of the second stage of any heating element below is later than the start time of the second stage of the heating element above it, and the end time of the second stage of any heating element below is also later than the end time of the second stage of the heating element above it, And the first target temperature of the first heating element is lower than the first target temperatures of the other heating elements.

2. The multi-stage temperature control method according to claim 1, characterized in that: The second phase of any one of the lower heating elements begins after the second phase of its adjacent upper heating element ends.

3. The multi-stage temperature control method according to claim 1, characterized in that: For heating elements other than the first heating element, the first stage includes two heating processes. In the first heating process, the temperature is first heated to the preheating temperature. After the second stage of the adjacent upper heating element is completed, the second heating process begins, and the temperature is raised from the preheating temperature to the first target temperature.

4. The multi-stage temperature control method according to claim 1, characterized in that: Except for the heating element at the lowest end along the axial direction of the heating chamber, the heating process of other heating elements also includes a fourth stage, in which the temperature of the heating element is maintained at the second target temperature.

5. The multi-stage temperature control method according to claim 4, characterized in that: Except for the heating element at the lowest end along the axial direction of the heating chamber, the second target temperature of any heating element below is greater than the second target temperature of the heating element above it.

6. The multi-stage temperature control method according to claim 1, characterized in that: The plurality of heating elements is four.

7. A multi-stage heating device, characterized in that: include: Heating chamber; A plurality of heating elements, wherein the plurality of heating elements are sequentially arranged from top to bottom along the axial direction of the heating chamber, and the uppermost heating element is a first heating element; A temperature control circuit is used to control the heating process of the multi-stage heating device according to the temperature control method described in any one of claims 1 to 6.

8. The multi-stage heating device according to claim 7, characterized in that: The heating element is a heating film.

9. The multi-stage heating device according to claim 7, characterized in that: It also includes a heat-conducting pipe, in which the heating cavity is formed, and the multiple heating elements surround the outer wall of the heat-conducting pipe.

10. The multi-stage heating device according to claim 9, characterized in that: It also includes a suction nozzle, which is arranged at one end close to the first heating element. The lower end of the heat-conducting tube forms an opening for inserting tobacco products.

11. The multi-stage heating device according to claim 10, characterized in that: The lower end of the heat-conducting pipe extends out from the plurality of heating elements to form an extension section.

12. A computer-readable storage medium, characterized in that: include: The computer executable instructions stored therein, when the processor executes the computer executable instructions, control the multi-stage heating equipment to implement the temperature control method described in any one of claims 1-6.

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