Cigarette heating appliance for detecting moisture of tobacco shreds through microwaves

Abstract

The utility model relates to the technical field of cigarette appliances, and provides a cigarette heating appliance for microwave detection of tobacco shred moisture, which comprises a shell, a switch device arranged on the shell, a heating element arranged in the shell and used for insertion of a cigarette, a PCB (printed circuit board) control circuit board and a probe support arranged in the shell, a system controller, a microwave oscillator and a microwave receiver arranged on the PCB control circuit board, and a temperature sensor arranged on the system controller, a microwave emitter and a microwave receiving probe are arranged on the probe support, the microwave emitter and the microwave receiving probe are symmetrically arranged on the two sides of the heating body, the microwave oscillator is connected with the microwave emitter through a microwave conduction wire, and the microwave receiver is connected with the microwave receiving probe through a microwave conduction wire. The moisture content of the tobacco shreds is detected in a non-contact mode through microwaves, the power of the heating body is controlled according to the moisture content of the tobacco shreds, and the fragrance of smoke is better; meanwhile, when the change of the moisture content of the cigarette is large and the cigarette is not suitable for smoking, the smoking set cannot be heated and prompts the user, and the influence on the customer experience is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cigarette appliances, and more particularly to a heating cigarette appliance for detecting moisture of tobacco by microwaves. BACKGROUND

[0002] In order to increase the amount of smoke in the heating process of a heating cigarette, a certain proportion of glycerol is added to the tobacco of the heating cigarette in production. Glycerol has good water absorption performance. It can absorb moisture in the air and retain it in its own molecules. Pure glycerol can absorb 40% of water, and the specific heat capacity of water is large, which has a significant impact on temperature changes. The heating temperature of a heating appliance is usually greater than 200 DEG C. When the heating appliance is heated, the water needs to be evaporated first before the temperature of the heating cigarette can be increased to above 100 DEG C. The latent heat of vaporization of water at 100 DEG C under one atmosphere (0.1 MPa) is as high as 2257.2 kJ / kg. Therefore, after the heating cigarette absorbs moisture in the air, it is usually not heated to the preset heating temperature, resulting in a small amount of smoke and poor aroma performance of the smoke.

[0003] In order to make the smoke performance of the heating cigarette not be affected by the moisture contained in the tobacco, a simple and feasible method is to appropriately increase the heating temperature of the heating appliance. However, the relative moisture content of the air is different in different seasons in different regions, and the sealing performance of the cigarette case is different, resulting in different moisture absorption of the cigarette over time. It is difficult to determine the appropriate heating temperature. However, if the moisture of the cigarette to be heated can be measured, and the heating temperature is accurately set according to the moisture content of the cigarette, the aroma of the smoke can be expected to achieve the desired heating effect. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiment of the application is to provide a heating cigarette appliance for detecting moisture of tobacco by microwaves, which is used to solve how to quickly detect the moisture content of a heating cigarette before the cigarette is smoked, and accurately control the heating temperature of the appliance according to the moisture content of the cigarette, so as to improve the consistency of the smoking performance of cigarettes with different moisture contents.

[0005] To achieve the above purpose, the technical scheme adopted by the application is as follows: a heating cigarette appliance for detecting moisture of tobacco by microwaves is provided, which comprises a shell, a switch device is arranged on the shell, a heating body for inserting a cigarette is arranged in the shell, a PCB control circuit board and a probe support are arranged in the shell, a system controller, a microwave oscillator and a microwave receiver are arranged on the PCB control circuit board, a microwave transmitter and a microwave receiving probe are arranged on the probe support, the microwave transmitter and the microwave receiving probe are symmetrically arranged on both sides of the heating body, the microwave oscillator is connected with the microwave transmitter through a microwave transmission line, and the microwave receiver is connected with the microwave receiving probe through a microwave transmission line.

[0006] In one embodiment, a battery is further provided in the housing.

[0007] In one embodiment, the PCB control circuit board is also electrically connected to an indicator light.

[0008] In one embodiment, the heating element is a ceramic heating element.

[0009] In one embodiment, the housing is a plastic housing.

[0010] In one embodiment, the probe holder is made of PEEK material.

[0011] Another object of the present application is to provide a control method for a cigarette heating device for detecting moisture in cut tobacco using microwaves, comprising the following steps:

[0012] S10: Obtain the power-on command and start the control program;

[0013] S20: Generate a microwave transmission instruction, the microwave oscillator transmits a microwave signal, and the microwave receiver receives the microwave signal;

[0014] S30, setting the heating temperature corresponding to the heating element according to the received microwave signal;

[0015] S40: Control the heating element to start heating according to the set temperature;

[0016] S50: When the heating cycle ends, the heating element is controlled to stop working;

[0017] S60: Terminate the control program and cut off the power supply.

[0018] In one embodiment, step 30 includes the following steps:

[0019] S31, first calculating the moisture content W of the cigarette according to the received microwave signal and a preset formula;

[0020] S32. Set the corresponding heating temperature of the heating element according to the moisture content W of the cigarette and the preset program.

[0021] In one embodiment, in step S31, step 311 is first executed: determining whether the moisture content W of the cigarette satisfies W1≤W≤W2; if so, step S32 is executed; if not, step S312 is executed: the indicator light displays a setting signal to alert the user; and then step S60 is executed;

[0022] Among them, the value range of W1 is 0.05-0.15, and the value range of W2 is 0.2-0.45.

[0023] In one embodiment, W1 is 0.1 and W2 is 0.3.

[0024] The beneficial effects of the microwave tobacco moisture detection device and control method for heating cigarettes provided in this application are:

[0025] This cigarette heating device uses microwaves to detect the moisture content of tobacco in a contactless manner, and controls the power of the heating element according to the moisture content of the tobacco, so that the aroma of the smoke is better. At the same time, when the moisture content of the cigarette changes significantly and is not suitable for smoking, the smoking device will not heat up and will prompt the user to avoid affecting the customer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A simplified cross-sectional structural diagram of a cigarette heating device for detecting moisture in cut tobacco using microwaves provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the positional relationship between the heating element, probe holder, microwave transmitter, and microwave receiving probe in the microwave tobacco moisture detection device provided in an embodiment of the present application;

[0029] Figure 3 A schematic flow chart of a control method for a cigarette heating device for detecting moisture in cut tobacco using microwaves provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of a specific flow chart of a control method for a heating cigarette device for detecting moisture in cut tobacco using microwaves provided in an embodiment of the present application;

[0031] Figure 5 This is a control schematic diagram of the system controller in the cigarette heating device for microwave detection of tobacco moisture provided in an embodiment of the present application.

[0032] Among them, the reference numerals in the figures are:

[0033] 1. Cigarette; 101. Filter; 102. Tobacco; 2. Heating element; 3. Microwave transmitter; 4. Microwave receiving probe; 5. Probe holder; 6. Microwave signal; 7. Housing; 8. PCB control circuit board; 9. Microwave oscillator; 10. System controller; 11. Microwave receiver; 12. Microwave transmission line; 13. Battery. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0035] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0038] like Figure 1-Figure 2As shown, a microwave tobacco moisture detection device for heating cigarettes provided in an embodiment of the present application will now be described. The microwave tobacco moisture detection device for heating cigarettes includes a housing 7 , which is provided with a switch device for controlling the opening and closing of the device. A heating element 2 is provided within the housing 7 , into which a cigarette 1 is inserted. The heating element 2 is a tubular heating element, and the cigarette 1 includes a filter 101 and tobacco 102 . The tobacco 102 is inserted into the heating element 2 , and the heating element 2 is used to heat the tobacco 102 . Housing 7 houses a PCB control circuit board 8 and a probe holder 5. PCB control circuit board 8 houses a system controller 10, a microwave oscillator 9, and a microwave receiver 11. Probe holder 5 houses a microwave transmitter 3 and a microwave receiving probe 4, symmetrically positioned on either side of heating element 2. Microwaves emitted by microwave transmitter 3 pass through heating element 2, tobacco 102, and heating element 2 before being received by microwave receiving probe 4. Microwave oscillator 9 is connected to microwave transmitter 3 via a microwave transmission line 12, and microwave receiver 11 is connected to microwave receiving probe 4 via a microwave transmission line 12. Housing 7 also houses a battery 13, which is connected to PCB control circuit board 8 to provide electrical energy. PCB control circuit board 8 is also electrically connected to an indicator light, and housing 7 includes a hole through which the indicator light passes.

[0039] During operation, the user inserts tobacco 102 from a cigarette 1 into the heating element 2 and activates the cigarette heating device via a switch. A microwave oscillator 9 on the PCB control circuit board 8 generates microwaves, which are transmitted via microwave transmission line 12 to the microwave transmitter 3, emitting a microwave signal 6. Microwave signal 6 penetrates the heating element 2 and the tobacco 102. As microwave signal 6 passes through the tobacco 102, the electromagnetic field resonates, as tobacco 102 contains glycerin, which has excellent water absorption properties and absorbs moisture from the air and retains it within its molecules. This energy loss increases as the moisture content of tobacco 102 increases. The lost energy reaches the other side of tobacco 102 and is received by microwave receiving probe 4. The lost microwave signal 6 is then transmitted via microwave transmission line 12 to microwave receiver 11 and fed back to the system controller 10. System controller 10 calculates the moisture content of tobacco 102 by calculating the dry matter absorption and certain geometric parameters. The system controller 10 controls the heating element 2 to generate corresponding power to heat the tobacco 102 according to the current moisture content of the measured tobacco 102 , thereby improving the heating effect of the tobacco 102 .

[0040] In this embodiment, the heating element 2 is a ceramic heating element, so that the microwave signal 6 has almost no loss when penetrating the heating element 2, thereby ensuring the accuracy of the moisture content measurement of the tobacco 102.

[0041] In this embodiment, the housing 7 is a plastic shell that protects the internal components. The probe holder is made of PEEK, which offers high-temperature and corrosion resistance and mechanical strength. The microwave transmission line 12 is characterized by its low loss and high Q factor. These properties enable the microwave transmission line 12 to maintain signal quality and stability when transmitting the microwave signal 6, minimizing signal loss.

[0042] like Figure 1-5 As shown, in this embodiment, the switch device is used to send a power-on instruction or a power-off instruction to the system controller 10 to control the power on and off of the heated cigarette smoking device; the system controller 10 has the following functions: for receiving the power-on instruction or the power-off instruction of the switch device and executing the corresponding power-on and power-off procedures; for generating and sending a heating instruction to the heating element 2 to control the operation of the heating element 2; for generating and sending a microwave emission instruction to the microwave vibrator to enable the microwave vibrator to generate a microwave signal 6; for receiving the microwave intensity signal sent by the microwave receiver 11, and calculating the moisture content W of the cigarette 1 according to the microwave intensity signal; for matching the corresponding heating temperature of the heating element 2 according to the moisture content of the cigarette 1; and also for judging whether the moisture content W of the cigarette 1 satisfies W1≤W≤W2, and executing different instructions according to the judgment result; and also for generating and sending a display instruction to the indicator light to control the operation of the indicator light. The microwave oscillator 9 is used to receive microwave emission instructions and generate a microwave signal 6 according to the instructions; the microwave receiver 11 is used to receive microwave reception instructions, receive the microwave signal 6 according to the instructions, and feedback the intensity of the microwave signal 6 to the system controller 10; the heating element 2 is used to receive heating instructions and heat and keep warm according to the heating instructions to heat the cigarette 1; the indicator light is used to receive display instructions and light up according to the display instructions.

[0043] like Figure 3-5 As shown, this embodiment also provides a control method for a cigarette heating device for detecting moisture in cut tobacco with microwaves, comprising the following steps:

[0044] S10: Obtain the power-on command and start the control program;

[0045] S20: Generate a microwave transmission instruction, the microwave oscillator 9 transmits the microwave signal 6, and the microwave receiver 11 receives the microwave signal 6;

[0046] S30, setting the heating temperature corresponding to the heating element 2 according to the received microwave signal;

[0047] S40: Control the heating element 2 to start heating according to the set temperature;

[0048] S50: When the heating cycle ends, the heating element 2 is controlled to stop working;

[0049] S60: Terminate the control program and cut off the power supply.

[0050] Specifically, in step 30, the following steps are included:

[0051] S31: Calculating the moisture content W of the cigarette 1 based on the received microwave signal 6 and a preset formula;

[0052] S32: Setting the corresponding heating temperature of the heating element 2 according to the moisture content W of the cigarette and the preset program.

[0053] The above control method can solve the problem of poor smoke performance caused by different moisture contents of cigarettes under normal circumstances. However, under some extreme conditions, due to the excessively high moisture content of the cigarette (such as the cigarette 1 being exposed to a humid environment for too long or soaked in water, etc.), it may exceed the range that the heated tobacco device can control. In order to ensure the consistency of user experience, the following steps are added to the control method: In step S31, first execute step 311: judge the cigarette: whether the moisture content W satisfies W1≤W≤W2. If so, execute step S32; if not, execute step S312: the indicator light displays a setting signal to remind the user to pay attention, indicating that the cigarette 1 cannot be smoked normally; then execute step S60, and the user replaces the new cigarette 1; wherein, the value range of W1 is 0.05-0.15, and the value range of W2 is 0.2-0.45. Preferably, W1 is 0.1 and W2 is 0.3.

[0054] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A heating device for heating tobacco with microwave detection of moisture content of cut tobacco, characterized in that: include: A shell (7) is provided with a switch device, a heating element (2) for inserting a cigarette (1) is provided in the shell (7), a PCB control circuit board (8) and a probe bracket (5) are provided in the shell (7), a system controller (10), a microwave oscillator (9) and a microwave receiver (11) are provided on the PCB control circuit board (8), a microwave transmitter (3) and a microwave receiving probe (4) are provided on the probe bracket (5), the microwave transmitter (3) and the microwave receiving probe (4) are symmetrically arranged on both sides of the heating element (2), the microwave oscillator (9) is connected to the microwave transmitter (3) through a microwave transmission line (12), and the microwave receiver (11) is connected to the microwave receiving probe (4) through the microwave transmission line (12).

2. The cigarette heating device for detecting moisture content of cut tobacco by microwave according to claim 1, characterized in that: A battery (13) is also provided in the housing (7).

3. The microwave tobacco moisture detection device for heating cigarettes according to claim 2, characterized in that: The PCB control circuit board (8) is also electrically connected to an indicator light.

4. The microwave tobacco moisture detection device for heating cigarettes according to claim 3, characterized in that: The heating element (2) is a ceramic heating element.

5. The cigarette heating device for detecting moisture content of cut tobacco by microwave according to claim 4, characterized in that: The housing (7) is a plastic housing.

6. The cigarette heating device for detecting moisture content of cut tobacco by microwave according to claim 5, characterized in that: The probe bracket (5) is made of PEEK material.

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