WO2024041507A1

WO2024041507A1 - Method for detecting heat transfer performance of circumferential heating smoking device

Info

Publication number: WO2024041507A1
Application number: PCT/CN2023/114181
Authority: WO
Inventors: 李斌; 聂长武; 李博; 齐伟; 张智轩; 付丽丽; 王爽; 张柯; 李显; 张齐; 张明建; 张展; 张越; 王艺璇; 尹献忠; 王兵
Original assignee: 中国烟草总公司郑州烟草研究院; 河南中烟工业有限责任公司
Priority date: 2022-08-22
Filing date: 2023-08-22
Publication date: 2024-02-29
Also published as: CN117652704A

Abstract

A method for detecting the heat transfer performance of a circumferential heating smoking device, comprising: step 1, filling a heating chamber of a circumferential heating smoking device with sand from top to bottom; step 2, covering the top of the heating chamber with a heat insulation device; step 3, inserting a thermocouple (2) into a specific position in the heating chamber, and collecting a temperature change curve of a sand bath (1) by means of the thermocouple (2); step 4, repeating steps 1-3 for multiple times of collection to obtain a standard temperature curve range; and step 5, for a circumferential heating smoking device to be detected in the same batch, collecting a temperature change curve of the sand bath (1) according to steps 1-3, and determining that the heat transfer performance of the circumferential heating smoking device does not meet the requirement. According to the detection method, the specific heat of sand is known, uniform filling can be achieved, a gap is controllable, it is not prone to abrasion and bonding, the physical and chemical properties are stable, and detection is convenient.

Description

A method for testing the heat transfer performance of circumferentially heated smoking sets

Technical field

The invention belongs to the technical field of heated smoking sets, and specifically relates to a method for detecting the heat transfer performance of circumferentially heated smoking sets.

Background technique

Traditional cigarettes release nicotine and flavor by directly burning tobacco to meet the needs of consumers. In recent years, as people's health awareness has increased, heat-not-burn cigarettes have emerged. Heat-not-burn cigarettes are new tobacco products that use matching heating cigarettes to heat tobacco products and obtain nicotine and flavor without burning them. They not only meet consumers' smoking needs, but also have the advantages of reducing coke and harm compared to traditional cigarettes. Features. It can be seen that heat-not-burn cigarettes include two parts: smoking sets and tobacco products. The quality of smoking sets directly determines consumers’ smoking experience of heat-not-burn cigarettes. There are many factors that affect the quality of smoking sets, but the most important factor is the heat transfer performance of the heating process, and the heat transfer performance of smoking sets directly affects the emissions of tobacco products.

At present, the main methods for measuring the heat transfer performance of heated smoking devices include infrared thermal imaging and direct thermocouple measurement. The infrared thermal imaging method can only measure the temperature field distribution at equilibrium, and cannot measure the temperature fluctuations (heat transfer performance) during the heating process of tobacco products by smoking devices in a timely manner. Infrared thermal imaging is also affected by environmental factors, and it is necessary to pass through the shell of the smoking device when measuring the smoking device. Each measurement requires the replacement of new tobacco products (standard test pieces are required), which has a greater impact on the results. It is more convenient and fast to respond directly to the temperature of the heating element with a thermocouple. However, the thermocouple can only be close to the surface of the heating element and measure the surface temperature. It cannot measure the temperature outside the surface and cannot measure the temperature field; and in the small space of the heating cavity, the thermocouple cannot It is difficult to install and does not facilitate large-scale batch testing; the thermocouple directly measures the temperature rather than the total calorific value, and requires conversion, which is not easy.

Therefore, these two commonly used measurement methods cannot satisfy the judgment of the heat transfer performance of smoking articles.

In order to solve the above problems, the present invention is proposed.

Contents of the invention

The invention provides a method for detecting the heat transfer performance of circumferentially heated smoking sets. The detection method includes the following steps:

Step 1. Fill the heating chamber of the circumferential heating smoking device with sand from top to bottom, and smooth away the excess sand;

Step 2. Cover the heat insulation device 3 with the thermocouple insertion hole 3-1 reserved on the top of the heating chamber from top to bottom to prevent heat from escaping from the upper part;

Step 3. Insert the thermocouple 2 through the thermocouple insertion hole 3-1 into the heating chamber for positioning. Set, start the circumferential heating smoking device, and collect the sand bath temperature change curve through the thermocouple 2;

Step 4. Use the same batch of different circumferential heating smoking devices, repeat steps 1 to 3 to collect multiple times, and obtain the standard temperature curve range;

Step 5. Follow steps 1 to 3 to collect the sand bath temperature change curve of the circumferentially heated smoking sets to be tested in the same batch. If the sand bath temperature change curve falls within the standard temperature curve range in step 4, then the heat transfer of this circumferentially heated smoking set is The performance meets the requirements. If the temperature change curve of the sand bath is not within the standard temperature curve range of step 4, the heat transfer performance of the circumferential heating smoker does not meet the requirements.

Preferably, the particle size of the sand particles is 0.2 to 0.6 mm.

Preferably, when the result of step 5 is: the heat transfer performance of the circumferential heating smoking device meets the requirements, the following operations are performed:

Step 6: Calculate the fluctuation range of the sand bath temperature change curve as the standard range;

If the fluctuation range of the sand bath temperature change curve of the circumferentially heated smoking set to be tested in the same batch is within the above standard range, then the heat transfer performance of this circumferentially heated smoking set meets the requirements of the fluctuation range;

If the fluctuation range of the sand bath temperature change curve of the circumferentially heated smoking set to be tested in the same batch is not within the above standard range, then the heat transfer performance of the circumferentially heated smoking set does not meet the requirements of the fluctuation range.

Preferably, the fluctuation range of the sand bath temperature change curve is the maximum value or the average value of the fluctuation range of the sand bath temperature change curves of different circumferentially heated smoking devices in the same batch.

Preferably, when the heat transfer performance of the circumferentially heated smoking set not only meets the requirements of step 5, but also further meets the requirements of step 6, the heat transfer performance of the central heated smoking set is deemed to be qualified.

The above technical solutions can be freely combined as long as they are not inconsistent.

Compared with the existing technology, the present invention has the following beneficial effects:

1. The present invention proposes a method of using a sand bath to detect the heat transfer performance of circumferentially heated smoking sets. The present invention does not use cigarettes, but chooses sand to be filled in the circumferentially heated smoking device heating chamber. The sand particles are preferably sand particles with a uniform particle size and a diameter of 0.2 to 0.6 mm. The specific heat of sand grains is known, it can be filled evenly, the gaps are controllable, it is not easy to wear and bond, it has stable physical and chemical properties, and it has low cost.

In addition, the bulk density and specific heat of sand particles are very stable, they do not decompose, and they do not produce pollutants. They are very suitable as test standard parts for batch testing of smoking articles. The gaps between sand particles also simulate shredded tobacco very well. the gap between. Using sand instead of cigarettes for testing is simpler and more convenient for batch testing.

If real cigarettes are used as standard test pieces for heating measurements, there are the following problems: (1) Cut tobacco The specific heat and filling density of cigarettes are different and difficult to control. When used as standard test pieces to test cigarettes in batches, the results are not comparable with each other; and the cigarettes are easy to break after repeated use, so they are not suitable for long-term repeated use as standard test pieces; ( 2) During the measurement process, smoke condensation, local burnt matter, residue, etc. will contaminate the smoking article being measured; (3) The properties of the cigarette change after thermal decomposition and cannot be used repeatedly.

Description of drawings

Figure 1 is a state diagram during the heat transfer performance test of the circumferential heating smoking device.

Figure 2 is a flow chart of heat transfer performance testing of circumferential heating smoking devices.

Figure 3 Standard temperature change curve range.

Figure 4 is a comparison chart of the temperature change curve of the smoking set with unqualified heat transfer performance during the experiment and the standard curve.

Figure 5 is a comparison chart between the temperature change curve and the standard curve of the smoking set with qualified heat transfer performance during the experiment.

1. Sand bath, 2. Thermocouple, 3. Heat insulation device, 3-1. Thermocouple insertion hole, 4. Smoking set body, 5. Circumferential heating element, 6. Temperature acquisition module.

Detailed ways

Those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. If specific techniques or conditions are not specified in the examples, the techniques or conditions described in literature in the field or product instructions will be followed. If the manufacturer of the materials or equipment used is not indicated, they are all conventional products that can be purchased.

Those skilled in the art will understand that, unless expressly stated otherwise, the singular forms "a", "an", "the" and "the" used herein may also include the plural form. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components and/or groups thereof. It will be understood that when we refer to an element being "coupled" to another element, it can be directly coupled to the other element or intervening elements may also be present. Additionally, "connection" as used herein may include wireless connections.

In the description of the present invention, unless otherwise specified, "plurality" means two or more. The orientation or state relationship indicated by the terms "inner", "upper", "lower", etc. is based on the orientation or state relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply what is meant. The device or component must Has a specific orientation, is constructed and operates in a specific orientation and is therefore not to be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise expressly stipulated and limited, the terms "installation", "connection" and "provided with" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

It will be understood by those skilled in the art that, unless otherwise defined, all terms including technical terms and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in general dictionaries are to be understood to have meanings consistent with their meaning in the context of the prior art, and are not to be taken in an idealized or overly formal sense unless defined as herein. explain.

As shown in Figure 2, a method for detecting the heat transfer performance of circumferentially heated smoking articles, the detection method includes the following steps:

Step 1. Fill the heating chamber of the circumferential heating smoking device with sand grains with a particle size of 0.2 to 0.6 mm from top to bottom, and smooth away the excess sand grains to form a sand bath 1;

The heat insulation device 3 also covers the smoking device main body 4;

Step 3. Insert the temperature measuring head of the thermocouple 2 through the thermocouple insertion hole 3-1 into a specific position in the heating chamber, start the circumferential heating smoking device, and collect the temperature changes of the sand bath through the thermocouple 2 curve;

After the temperature measurement is completed, turn off the smoking set, exit the temperature measurement head, remove the heat insulation device 3, and remove the sand bath.

The first implementation is as follows:

This experiment uses a sand bath with a sand particle diameter of about 0.2mm, and the theoretical heating temperature of the smoking device is 270 degrees. Pour the sand bath into the heating chamber of the smoking device and smooth out the excess sand bath. Insert the thermocouple into the sand bath at a distance of 2.8mm from the center of the heating chamber. The insertion depth is about 10mm. Start heating. Each test uses the same batch with different circumferential directions. Heat the smoking device and measure 10 times to obtain the standard temperature change curve range (Figure 3).

Collect the temperature change curve of the smoking device sample 2 to be tested according to steps 1 to 3. The temperature change curve of the sample machine 1 is shown in Figure 3. The temperature change curve of the sample machine 2 is not within the upper limit curve and the lower limit curve. Therefore, it is proved that the smoking device to be tested is The heat transfer performance of prototype 2 is unqualified.

Collect the temperature change curve of the smoking device sample 1 to be tested according to steps 1 to 3. The temperature change curve of the sample machine 1 is shown in Figure 5. The temperature change curve of the sample machine 1 is within the upper limit curve and the lower limit curve. Therefore, it is proved that the smoking device to be tested is The heat transfer performance of prototype 1 is qualified.

Claims

A method for detecting the heat transfer performance of circumferentially heated smoking sets, characterized in that the detection method includes the following steps:

Step 1. Fill the heating chamber of the circumferential heating smoking device with sand from top to bottom, and smooth away the excess sand;

Step 2. Cover the heat insulation device (3) with the thermocouple insertion hole (3-1) reserved on the top of the heating chamber from top to bottom to prevent heat from escaping from the upper part;

Step 3. Insert the thermocouple (2) through the thermocouple insertion hole (3-1) into a specific position in the heating chamber, start the circumferential heating smoking device, and collect sand through the thermocouple (2). Bath temperature change curve;

Step 4. Use the same batch of different circumferential heating smoking devices, repeat steps 1 to 3 to collect multiple times, and obtain the standard temperature curve range;

Step 5. Follow steps 1 to 3 to collect the sand bath temperature change curve of the circumferentially heated smoking sets to be tested in the same batch. If the sand bath temperature change curve falls within the standard temperature curve range in step 4, then the heat transfer of this circumferentially heated smoking set is The performance meets the requirements. If the temperature change curve of the sand bath is not within the standard temperature curve range of step 4, the heat transfer performance of the circumferential heating smoker does not meet the requirements.
The method for detecting heat transfer performance of a circumferentially heated smoking set according to claim 1, characterized in that, in step 3, before starting the circumferentially heated smoking set, the air inlet of the circumferentially heated smoking set is blocked to prevent heat Lost.
The method for detecting the heat transfer performance of a circumferentially heated smoking set according to claim 1, wherein the particle size of the sand particles is 0.2 to 0.6 mm.
The method for detecting the heat transfer performance of a circumferentially heated smoking set according to claim 1, characterized in that when the result of step 5 is that the heat transfer performance of the circumferentially heated smoking set meets the requirements, the following operations are performed:

Step 6: Calculate the fluctuation range of the sand bath temperature change curve as the standard range;

If the fluctuation range of the sand bath temperature change curve of the circumferentially heated smoking set to be tested in the same batch is within the above standard range, then the heat transfer performance of this circumferentially heated smoking set meets the requirements of the fluctuation range;

If the fluctuation range of the sand bath temperature change curve of the circumferentially heated smoking set to be tested in the same batch is not within the above standard range, then the heat transfer performance of the circumferentially heated smoking set does not meet the requirements of the fluctuation range.
The method for detecting heat transfer performance of circumferentially heated smoking sets according to claim 4, characterized in that the fluctuation range of the sand bath temperature change curve is the maximum fluctuation range of the sand bath temperature change curves of different circumferentially heated smoking sets in the same batch. value or average.
The method for detecting heat transfer performance of a circumferentially heated smoking set according to claim 1, characterized in that a heating chamber is formed inside the circumferential heating element (5) of the circumferentially heated smoking set.
The method for detecting heat transfer performance of circumferentially heated smoking articles according to claim 1, characterized in that the thermocouple (2) is connected to the temperature acquisition module (6).