CN203986081U - A kind of middle suspended type electric heater for electric heating type cigarette - Google Patents

Abstract

The utility model relates to a mid-suspension type electric heater for electric heating cigarettes, comprising: a heating element (1), a heating element fixing part (2), a heat insulation layer (3), and a casing (6). The element fixing piece only fixes the two ends of the heating element, ensuring that its middle section is in a suspended state; the heat insulation layer surrounds the heating element but does not contact it. Preferably the insulating layer has a plurality of sub-layers with gaps (4) between each sub-layer. Preferably, the heating element defines a heating chamber (5). More preferably, the heating element fixing part has an air inlet (7), which communicates with the gap; the gap communicates with the heating chamber through at least one through hole (8); the above air inlet, gap, and through hole form an air flow The air flowing through the airflow channel can carry the heat lost in the gap of the heat insulation layer into the heating chamber and contact the tobacco products therein. The electric heater of the utility model has a fast response speed due to good heat insulation effect, and can be heated to over 350 degrees within 1-2 seconds when no-loaded.

Description

An electric heater suspended in the middle for electric heating cigarettes

technical field

The utility model belongs to the field of electric heaters, in particular to the field of fast-response electric heaters.

technical background

As the expansion and supplement of traditional cigarettes, the development of new tobacco products is inevitable, and related research work has also begun. Because the heating temperature of new electric heating cigarettes does not exceed 500 ℃, tobacco products are made to smoke in the form of heating but not burning, which can meet the sensory needs of consumers while reducing the harmful components cracked by tobacco in high-temperature environments. Research hotspots in tobacco industry.

The new electric heating cigarette heater in the prior art typically includes a heating cavity, an electric heating element, a heat insulation layer, and an electric heating element carrier, wherein the electric heating element is assembled by a carrier such as a ceramic cup, a ceramic rod, or a metal cup. The heating element is fixed on the carrier in a winding and nesting manner, and the heat of the heating element will form a contact heat conduction loss through the carrier, resulting in a long response time of the heating element, that is, heating to the required maximum temperature, usually within 20-60 seconds; At the same time, the heat insulation material used in the heat insulation layer has poor heat insulation effect if it is less than 3mm, and increasing the thickness of the heat insulation material will increase the size of the heater, making it difficult to achieve the best match between the heat insulation effect and the size of the heater.

In view of the above problems, the utility model provides a new electric heater for cigarettes, which can reduce the heat loss of the heating element and shorten the response time of the heating element.

Utility model content

The purpose of this utility model is to solve the shortcomings of the above-mentioned background technology and provide an electric heater for a new type of cigarette.

The utility model provides an intermediate suspended electric heater for electric heating cigarettes, comprising: a heating element 1, a heating element fixing part 2, a heat insulation layer 3, and a casing 6, and is characterized in that the heating element fixing part 2. Only fix the two ends of the heating element 1 to ensure that the middle section of the heating element 1 is in a suspended state, thereby reducing heat conduction loss; the heat insulation layer 3 surrounds the heating element 1 but does not contact the heating element 1; wherein The casing 6 surrounds the heat insulation layer 3 .

The heating element 1 can be made of high-temperature alloy materials such as nickel-chromium, iron-chromium-aluminum, and constantan, preferably iron-chromium-aluminum alloy, and processed by wire cutting and die stamping. The shape of the heating element can be a multi-piece structure, that is, a plurality of parallel heating sheets define a heating chamber 5, in this case, the gaps between each heating sheet can allow airflow to flow into the heating chamber; or the heating element 1 It is an integral cylinder structure, and the cylinder wall defines a heating chamber 5. In this case, at least one, preferably several air holes 9 need to be opened in the bottom circumferential direction of the cylinder wall to allow airflow to enter the heating chamber. The cross-section of the heating chamber may be circular or polygonal, depending on the shape of the tobacco product to be inserted into the heating chamber. The multi-piece structure can realize sliced heating, and the overall cylinder structure can realize integrated heating. Both have their advantages and disadvantages.

The heating element fixing part 2 is made of high temperature resistant insulating material, and the heating element is fixed in the form of slots or holes, and it is guaranteed to have a certain mechanical strength after fixing.

In a preferred embodiment of the present utility model, the heat insulation layer 3 has at least two sublayers, preferably three sublayers, and a gap 4 is left between each sublayer, and the size of the gap is 0.1-1 mm. The gap is filled with air instead of solid heat insulating material. Because the air has a strong heat insulating performance, it can effectively prevent the conduction loss of heat from the heating element to the shell, and reduce the overall weight of the heater. Conventional insulating materials can be used for each sublayer.

In a preferred embodiment of the present invention, the contact area between the heating element 1 and the heating element fixing part 2 is 5%-35%, preferably 15-20%, of the surface area of the heating element 1 . Reducing the contact area facilitates reducing heat conduction losses through the heating element mount.

In a preferred embodiment of the present utility model, the thickness of the contact portion between the heating element 1 and the heating element fixing part 2 is 2-4 times the thickness of the middle suspended section of the heating element, the contact The width of the part is 1-2 times of the width of the middle suspension segment. The purpose of this design is to reduce the current density of the contact part, reduce ohmic heating, reduce the heat loss caused by the heat conduction of the fixing part of the heating element, and make the heating of the heating element more concentrated in its middle suspended section.

In a preferred embodiment of the present utility model, the heating element fixing part 2 at at least one end has an air inlet 7, and the air inlet 7 communicates with the gap 4; the gap 4 passes through at least one through hole 8 The slit 10 or air hole 9 communicates with the inside of the heating chamber 5 ; the air intake hole 7 , gap 4 , through hole 8 and the slit 10 or air hole 9 constitute an airflow channel for the air entering the heating chamber 5 . The air flowing through the airflow channel can carry the heat lost in the gap of the heat insulation layer into the heating chamber and contact the tobacco products therein, so as to recover heat to a certain extent. In a more preferred embodiment, when the heating element 1 is an integral cylindrical structure, an air guide tube 11 may be provided between the through hole 8 and the air hole 9, so that the air flow only flows in the air guide tube 11 Pass. This design can make the air in the gap between the cylindrical heating element 1 and the heat insulation layer 3 not affected by the above-mentioned air flow, and always be in a relatively static and closed state, which is conducive to maintaining its heat insulation effect.

In a preferred embodiment of the present utility model, the heating element fixing member 2 fixes the heating element 1 in the form of slots or holes, and ensures a certain mechanical strength after fixing.

In a preferred embodiment of the present utility model, the inner wall of the heating element fixing part 2 forms the same plane as the inner surface of the heating element 1 to ensure that tobacco products can be smoothly placed into the heating cavity.

Because of its unique heat insulation design, the electric heater of the utility model, for example, the heating element fixing part 2 only fixes both ends of the heating element to ensure that the middle section of the heating element is in a suspended state, thereby greatly reducing the contact heat conduction loss of the heating element. And the heat insulation layer 2 adopts multi-layer gap heat insulation, which can minimize heat loss, therefore, under the same input electric power, it can realize fast response. It can heat the temperature in the heating chamber to over 350 degrees within 1-2 seconds when it is empty, that is, when there is no tobacco product inserted in the heating chamber; in addition, the above-mentioned gap heat insulation design also improves the heat insulation effect, ensuring While the temperature of the heater shell is less than 40°C, the size of the heater can be reduced to a certain extent.

Description of drawings

Fig. 1 is a structural schematic diagram of a fast-response electric heater for a new type of cigarette of the present invention.

Description of Reference Signs: 1. Heating element; 2. Heating element fixing piece; 3. Insulation layer; 4. Gap; 5. Heating chamber; 6. Shell; 7. Air intake hole; 8. Through hole; 9. Air hole .

Detailed ways

Figure 1 is a schematic diagram of the structure of a fast-response electric heater for a new type of electric heating cigarette. Wherein, the heating element 1 is cylindrical, which defines a heating chamber 5, and its heating method is integral heating. The heating element fixing part 2 is only fixed on the two ends of the heating element 1, therefore, the middle section of the heating element 1 is suspended.

The thickness and width of the end part of the heating element in contact with the heating element fixing piece are 2-4 times and 1-2 times of the thickness and width of the middle suspension section, which reduces the current density of the heating element and the fixing piece contacting part, reducing Ohmic heating, the contact area of the heating element 1 and the heating element fixing part 2 is designed to be 15% of the surface area of the heating element, which reduces the contact heat conduction loss of the heating element.

The heating element fixing part 2 is a kind of high temperature resistant insulating material, preferably alumina ceramics, which is processed into the upper end fixing part and the lower end fixing part matching the heating element structure size in the form of slots or openings, and adopts tight fit The two ends of the heating element are respectively fixed by the method to ensure a certain mechanical strength after fixing. The inner diameter of the heating element fixing part 2 is infinitely close to the outer diameter of the tobacco product, thereby ensuring that the inner wall of the fixing part and the inner surface of the heating element form the same plane, and ensuring that the tobacco product can be smoothly inserted into and taken out of the heating cavity. At least one end of the heating element fixing part has an air inlet hole 7 .

The heat insulation layer 2 adopts a multi-layer gap design, which includes multiple sub-layers, and the material of each sub-layer is independently selected from aluminum alloy, magnesium-aluminum alloy, stainless steel, polytetrafluoroethylene and other materials, and each sub-layer is processed to form a thin-walled circular The thickness of the thin-walled cylinder is 0.2-0.8mm, and the number of layers of the thin-walled cylinder can be two or more, preferably three layers, wherein the innermost layer of the thin-walled cylinder does not contact the heating element. A gap 4 is formed between each sub-layer, and the size of the gap is 0.1-1mm, which makes full use of the heat insulation performance of the air, and effectively prevents the heat conduction loss of the heating element to the shell. A through hole 8 leading to the heating cavity 5 is opened in a certain part of the gap 4 . The air intake hole 7, the gap 4, the through hole 8, the air hole 9 or the gap 10 constitute an air flow channel, so that the outside air first flows through the gap 4 in the heat insulation layer and recovers part of the heat lost in the gap of the heat insulation layer, and then passes through The through holes 8 and air holes 9 or slits 10 enter into the heating cavity 5 and contact the tobacco products therein. The overall airflow direction is as follows: air intake hole 7→gap 4→through hole 8→air hole 9 or gap→heating cavity 5→tobacco product→cigarette holder (not shown)→into the smoker's mouth.

Claims (8)

1. the middle suspended type electric heater for electric heating type cigarette, comprise: heating element heater (1), heating element heater fixture (2), thermal insulation layer (3), shell (6), it is characterized in that, described heating element heater fixture (2) is the two ends of fixing heating element heater (1) only, ensure that the interlude of heating element heater (1) is in vacant state; Described thermal insulation layer (3) surrounds described heating element heater (1) but does not contact with described heating element heater (1); Wherein said shell (6) surrounds described thermal insulation layer (3).

2. middle suspended type electric heater according to claim 1, wherein said thermal insulation layer (3) has at least two subgrades, leaves gap (4) between each subgrade, and this gap size is 0.1-1mm.

3. middle suspended type electric heater according to claim 1, the contact area between wherein said heating element heater (1) and described heating element heater fixture (2) is the 5%-35% of the surface area of heating element heater (1).

4. middle suspended type electric heater according to claim 1, the thickness of the contact portion between wherein said heating element heater (1) and described heating element heater fixture (2) be unsettled section of the centre of described heating element heater thickness 2-4 doubly, the width of described contact portion be unsettled section of described centre width 1-2 doubly.

5. middle suspended type electric heater according to claim 2, wherein said heating element heater (1) is multiple-piece structure, multiple parallel heating plates limit a heating chamber (5), between each heating plate, leave gap; Or described heating element heater (1) is integrated cylinder type structure, barrel limits a heating chamber (5), on the circumferencial direction of described barrel bottom, offers at least one pore (9).

6. middle suspended type electric heater according to claim 5, wherein at least has air admission hole (7) on the described heating element heater fixture (2) of one end, and this air admission hole (7) is communicated with described gap (4); Described gap (4) is by the internal communication of at least one through hole (8) and described gap or described pore (9) and described heating chamber (5); Above-mentioned air admission hole (7), gap (4), through hole (8) form the gas channel to heating chamber (5) air inlet with gap or described pore (9).

7. suspended type electric heater in the middle of according to claim 1, wherein said heating element heater fixture (2) to be to slot or the fixing described heating element heater (1) of form of perforate, and ensures after fixing to have certain mechanical strength.

8. middle suspended type electric heater according to claim 1, it is characterized in that the inwall of described heating element heater fixture (2) and the inner surface of described heating element heater (1) form same plane, guarantee tobacco product can be inserted heating cavity smoothly.