Heater and smoking set

Abstract

The present invention discloses a heater, comprising: a substrate, the surface of which includes a heating area and a fixing area; a conductive track disposed in the heating area; an electrode connected to the conductive track; and a base connected to the fixing area for fixing the substrate, wherein the base does not contact the conductive track or the electrode. The present invention can prevent the conductive track or electrode from directly conducting heat to the base, reduce heat loss in the heating area near the base, thereby increasing the temperature of the heating area near the base and improving the temperature uniformity of the heating area. This ensures that the tobacco segment heated by the heating area near the base is fully heated and has a high smoke release rate, while avoiding the problem of the smoking device being scalded due to excessive base temperature. The present invention also provides a smoking device.

Description

Technical Field

[0001] The present invention relates to the field of heating novel tobacco products, and in particular to a heater and a smoking device. Background Art

[0002] Currently, heaters for new tobacco products come in two types: needle and disc. A representative disc heater is the zirconia ceramic disc used in IQOS devices. Its base is made of zirconia, and its conductive tracks are made of platinum alloy. Different sections of the conductive tracks use different compositions, creating distinct high and low temperature zones. This results in inadequate heating of tobacco near the low temperature zones, resulting in low smoke utilization. Needle heaters use an aluminum oxide base and a tungsten alloy conductive track. The tracks are made of the same material and have essentially the same thickness.

[0003] Both types of heaters have the problem of heat conduction from the heating needles / plates to the base, resulting in low temperature of the heating needles / plates near the base and poor temperature uniformity of the heating needles / plates. The tobacco section near the base is not heated sufficiently and the smoke is not released completely. If the base temperature is too high, the heat will be transferred to the outer shell of the smoking device, causing the smoking device to be hot. Summary of the Invention

[0004] The present invention aims to address the existing problems of insufficient heating of the tobacco section near the base, resulting in incomplete smoke release, and excessively high base temperatures, which transfer heat to the outer casing of the smoking device and cause overheating. The present invention provides a heater that, by distancing the base from the conductive track and the two electrodes, reduces the amount of heat transferred from the heater to the base, thereby addressing these technical issues.

[0005] In order to solve the above technical problems, one object of the present invention is to provide a heater, comprising: a substrate, whose surface includes a heating area and a fixing area; a conductive track, which is arranged in the heating area; an electrode, which is connected to the conductive track; and a base, which is connected to the fixing area and is used to fix the substrate, wherein the base is not in contact with the conductive track or the electrode.

[0006] By adopting the above technical solution, the base is arranged to be non-contact with the conductive track and the electrode, thereby avoiding the conductive track or the electrode from directly conducting heat to the base, reducing the heat loss in the heating area near the base, thereby increasing the temperature of the heating area near the base, and improving the temperature uniformity of the heating area, so that the tobacco segment heated by the heating area near the base is fully heated and the smoke release rate is high, while avoiding problems such as the base temperature being too high and the smoking device being hot.

[0007] According to another specific embodiment of the present invention, a hollow cavity is provided inside the base body.

[0008] According to another specific embodiment of the present invention, it further includes a wire, wherein both ends of the wire are respectively connected to the electrode and the power supply to form an energized circuit, and the wire is led out from the hollow cavity.

[0009] According to another specific embodiment of the present invention, the electrode is arranged on an end of the heating area away from the fixing area.

[0010] According to another specific embodiment of the present invention, the conductive track is connected in series with the electrode, wherein the extension direction of the substrate is defined as the length direction, and the heating area is provided with a first heating area and a second heating area in sequence along the length direction from close to to far away from the fixed area, and the heat generated per unit length by the first heating area is greater than the heat generated per unit length by the second heating area.

[0011] According to another embodiment of the present invention, the width of the conductive track in the first heating area is smaller than that in the second heating area, and / or the length of the conductive track in the first heating area is greater than that in the second heating area.

[0012] According to another specific embodiment of the present invention, a third heating area is further provided on the side of the second heating area away from the first heating area, and the heat generated per unit length by the third heating area is greater than the heat generated per unit length by the second heating area.

[0013] According to another embodiment of the present invention, the width of the conductive track located in the first heating area is smaller than the width of the conductive track located in the second heating area, and / or the length of the conductive track located in the first heating area is greater than the length of the conductive track located in the second heating area;

[0014] And, the width of the conductive track located in the third heating zone is smaller than the width of the conductive track located in the second heating zone, and / or the length of the conductive track located in the third heating zone is greater than the length of the conductive track located in the second heating zone.

[0015] According to another specific embodiment of the present invention, the conductive track is a positive temperature coefficient thermistor, and the conductive track is connected in parallel with the electrode to form multiple conductive track branches, wherein the extension direction of the substrate is defined as the length direction, and the heating area is divided into multiple branch heating areas along the length direction. Each branch heating area is provided with at least one conductive track branch, and the heat generated per unit length by the multiple branch heating areas when power is first supplied is different.

[0016] According to another specific embodiment of the present invention, in a direction from far away to close to the fixed area, the heat generated per unit length of the plurality of branch heating areas decreases one by one when power is first turned on.

[0017] According to another specific embodiment of the present invention, the material used to make the conductive traces includes silver-palladium alloy and / or tungsten alloy.

[0018] Another object of the present invention is to provide a smoking article comprising any one of the above-mentioned heaters.

[0019] Another inventive object of the present invention is to provide a heater, comprising: a substrate, whose surface includes a heating area and a fixed area; a conductive track, arranged in the heating area; an electrode, connected to the conductive track; the conductive track and the electrode are connected in series, wherein the extension direction of the substrate is defined as the length direction, and the heating area is provided with a first heating area and a second heating area in sequence along the length direction from close to to far away from the fixed area, and the heat generated per unit length by the first heating area is greater than the heat generated per unit length by the second heating area.

[0020] According to another embodiment of the present invention, the width of the conductive track in the first heating area is smaller than that in the second heating area, and / or the length of the conductive track in the first heating area is greater than that in the second heating area.

[0021] According to another specific embodiment of the present invention, a third heating area is further provided on the side of the second heating area away from the first heating area, and the heat generated per unit length by the third heating area is greater than the heat generated per unit length by the second heating area.

[0022] According to another embodiment of the present invention, the width of the conductive track located in the first heating area is smaller than the width of the conductive track located in the second heating area, and / or the length of the conductive track located in the first heating area is greater than the length of the conductive track located in the second heating area;

[0023] And, the width of the conductive track located in the third heating zone is smaller than the width of the conductive track located in the second heating zone, and / or the length of the conductive track located in the third heating zone is greater than the length of the conductive track located in the second heating zone.

[0024] Another inventive object of the present invention is to provide a heater, comprising: a substrate, whose surface includes a heating area and a fixed area; a conductive track, arranged in the heating area; an electrode, connected to the conductive track; the conductive track is a positive temperature coefficient thermistor, and the conductive track and the electrode are connected in parallel to form multiple conductive track branches, wherein the extension direction of the substrate is defined as the length direction, and the heating area is divided into multiple branch heating areas along the length direction, each branch heating area is provided with at least one conductive track branch, and the heat generated per unit length by the multiple branch heating areas when power is first applied is different.

[0025] According to another specific embodiment of the present invention, in a direction from far away to close to the fixed area, the heat generated per unit length of the plurality of branch heating areas decreases one by one when power is first turned on.

[0026] According to another specific embodiment of the present invention, the material used to make the conductive traces includes silver-palladium alloy and / or tungsten alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram showing a heater according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram showing a heater according to another embodiment of the present invention;

[0029] Figure 3 A schematic diagram showing a conductive track according to an embodiment of the present invention;

[0030] Figure 4 A schematic diagram showing a conductive track according to another embodiment of the present invention;

[0031] Figure 5 A schematic diagram showing a conductive track according to yet another embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. Substrate; 2. Conductive track; 3. Electrode; 4. Base; 5. Wire; 6. Insulation layer; 21. First conductive track branch; 22. Second conductive track branch; 23. Third conductive track branch; a. First heating area; b. Second heating area; c. Third heating area; d. First branch heating area; e. Second branch heating area; f. Third branch heating area. DETAILED DESCRIPTION

[0034] The following is an explanation of the embodiments of the present invention by specific specific examples. 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 embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain 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.

[0035] 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 or explained in subsequent drawings.

[0036] 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 in use. 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. Therefore, they cannot be understood as limitations on the present invention.

[0037] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0038] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0039] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, the present invention provides a heater, comprising: a substrate 1, whose surface includes a heating area and a fixing area; a conductive track 2, arranged in the heating area; two electrodes 3, respectively connected to the two ends of the conductive track 2; a base 4, connected to the fixing area, for fixing the substrate 1, wherein the base 4 is not in contact with the conductive track 2 and the two electrodes 3.

[0041] With this technical solution, the electrode 3 transmits electrical energy to the conductive track 2, and the conductive track 2 converts the electrical energy into heat energy to heat the tobacco. By arranging the base 4 so that it is not in contact with the conductive track 2 and the two electrodes 3, the conductive track 2 or the electrode 3 is prevented from directly conducting heat to the base 4. Heat is only transferred by the base 1, and the thermal conductivity of the base 1 is relatively low, thereby reducing heat loss in the heating area near the base 4, thereby increasing the temperature of the heating area near the base 4 and improving the temperature uniformity of the heating area. The tobacco section heated in the heating area near the base 4 is fully heated and the smoke release rate is high. At the same time, the base 4 is prevented from being too hot and conducting heat to the outer shell of the smoking device, causing the smoking device to be hot.

[0042] Furthermore, the substrate 1 is made of a material with low thermal conductivity, such as zirconium oxide, to prevent excessive heat on the conductive track 2 and the electrode 3 from being indirectly transferred to the base 4 through the substrate 1. The conductive track 2 is made of a material with high electro-thermal efficiency, such as silver-palladium alloy, tungsten alloy, etc., to improve the efficiency of converting electrical energy into thermal energy and improve the utilization rate of electrical energy. The electrode 3 is made of a low-resistance material, such as copper, gold, silver, etc., to reduce energy loss at the electrode 3 and improve the utilization rate of electrical energy. The base 4 is made of a material with low thermal conductivity, such as zirconium oxide, mullite, foamed perlite, etc., to prevent excessive heat from being transferred to the outside through the base 4.

[0043] Alternatively, as Figure 2 As shown, a hollow cavity is provided inside the substrate 1. As the volume of the substrate 1 is reduced, the energy loss of the substrate 1 itself is reduced, and the heat conduction from the substrate 1 to the outside is reduced. The heating rate of the conductive track 2 is significantly improved during the heating stage, and the preheating process can be completed faster, and the flue gas response speed is fast.

[0044] Optionally, two wires 5 are further included, and the two wires 5 are respectively connected to the two electrodes 3 and the two ends of the power supply to form an electrical circuit. The two wires 5 are led out from the hollow cavity, so there is no need to reserve a channel for the wires 5 on the substrate 1 or the base 4, and the manufacture and installation of the heater are simpler. The wires 5 are made of low-resistance materials, such as nickel-chromium wire, silver wire, copper wire, etc., to reduce the heat generated by the wires 5 and the heat transmitted by the wires 5 to the circuit board, effectively reducing the temperature of the circuit board and avoiding overheating and malfunction of the circuit board. Among them, the wires 5 and the power supply can be directly connected or indirectly connected. For example, the wires 5 will first be directly connected to the circuit board and then connected to the power supply through other wires 5.

[0045] Optionally, the two electrodes 3 are arranged at one end of the heating area away from the fixed area, extending the distance from the electrode 3 to the circuit board, thereby increasing the length of the wire 5 and reducing the heat transmitted from the electrode 3 to the circuit board through the wire 5, which also effectively reduces the temperature of the circuit board and prevents the circuit board from overheating and malfunctioning.

[0046] Optionally, the heater further includes an insulating layer 6 located on both sides of the conductive track 2 to provide insulation between the conductive track 2 and the substrate 1, and between the conductive track 2 and the air. The insulating layer 6 is made of a high-adhesion, high-temperature-resistant material, such as glass, so that the insulating layer 6 can be firmly attached to the conductive track 2 and maintain its state and performance when the conductive track 2 heats up. The heater also includes a solder for soldering the wire 5 to the electrode 3. The solder is made of a high-temperature-resistant material, such as silver paste, to maintain its state and performance when the conductive track 2 heats up and the electrode 3 is at a high temperature.

[0047] Optionally, the conductive track 2 is connected in series between the two electrodes 3, and the extension direction of the substrate 1 is defined as the length direction (i.e., the AA direction in the accompanying drawings). The heating areas are provided with a first heating area a and a second heating area b in sequence along the length direction from close to to far away from the fixed area. The heat generated by the first heating area a per unit length is greater than the heat generated by the second heating area b per unit length.

[0048] Optionally, controlling the amount of heat generated per unit length in different heating zones can be achieved by changing the resistance of the conductive track 2 in each zone. Since the conductive track 2 is connected in series between the two electrodes 3, when the zone length is constant, the amount of heat generated per unit length in each zone increases as the resistance of the conductive track 2 in that zone increases. Changing the resistance of the conductive track 2 can be achieved by changing the material, width, length, etc. of the conductive track 2. From the perspective of ease of processing, preferably, the amount of heat generated per unit length in different heating zones is changed by controlling the length and width of the conductive track 2. The width of the conductive track 2 in the first heating zone a is smaller than the width of the conductive track 2 in the second heating zone b, and / or the length of the conductive track 2 in the first heating zone a is greater than the length of the conductive track 2 in the second heating zone b.

[0049] Figure 3 FIG. 2 is a schematic diagram showing the conductive track 2 on the side of the substrate 1 unfolded into a planar state. Figure 3 As shown, the heat generated per unit length in the first heating area a is greater than the heat generated per unit length in the second heating area b, thereby compensating for the heat loss in the first heating area a caused by heat conduction from the substrate 1 to the base 4, preventing the temperature of the first heating area a from being lower than that of the second heating area b, and improving the temperature uniformity of the heating areas, so that the tobacco segment heated by the first heating area a is fully heated and the smoke release rate is high.

[0050] Optionally, the heater can be a needle heater or a sheet heater. In order to improve the anti-bending performance of the heater, a needle heater is preferably used.

[0051] Optionally, a third heating region c is further provided on a side of the second heating region b away from the first heating region a, and the heat generated per unit length by the third heating region c is greater than the heat generated per unit length by the second heating region b.

[0052] Optionally, the width of the conductive track 2 located in the first heating area a is smaller than the width of the conductive track 2 located in the second heating area b, and / or the length of the conductive track 2 located in the first heating area a is greater than the length of the conductive track 2 located in the second heating area b;

[0053] and, the width of the conductive track 2 located in the third heating area c is smaller than the width of the conductive track 2 located in the second heating area b, and / or the length of the conductive track 2 located in the third heating area c is greater than the length of the conductive track 2 located in the second heating area b.

[0054] Figure 4 FIG. 2 is a schematic diagram showing the conductive track 2 on the side of the substrate 1 unfolded into a planar state. Figure 4 As shown, the heat generated per unit length in the first heating area a is greater than the heat generated per unit length in the second heating area b, and the heat generated per unit length in the third heating area c is greater than the heat generated per unit length in the second heating area b, thereby compensating for the heat loss in the first heating area a caused by heat conduction from the substrate 1 to the base 4 and the heat loss in the third heating area c caused by the lack of the conductive track 2 at the needle tip of the substrate 1, avoiding the temperature of the first heating area a and the third heating area c being lower than the second heating area b, improving the temperature uniformity of the heating areas, and ensuring that the tobacco segments heated by the first heating area a and the third heating area c are fully heated and have a high smoke release rate.

[0055] Optionally, the conductive track 2 is a positive temperature coefficient thermistor, and the conductive track 2 is connected in parallel between the two electrodes 3 to form multiple conductive track branches. The extension direction of the substrate 1 is defined as the length direction, and the heating area is divided into multiple branch heating areas along the length direction. Each branch heating area includes at least one conductive track branch, and the heat generated per unit length by the multiple branch heating areas when power is first applied is different.

[0056] Specifically, since the multiple conductive track branches are formed by the conductive track 2 being connected in parallel between the two electrodes 3, the initial resistance (i.e., the resistance value when not heated) of the multiple conductive track branches can be set to be different. When the power is first turned on, the smaller the resistance value of the conductive track branch, the greater the current and power, and the greater the heat generated per unit length in the branch heating area where it is located. After the power is turned on, the branch heating area that generates the most heat per unit length when the power is first turned on, that is, the branch heating area where the conductive track branch with the smallest resistance value when the power is first turned on is located, the temperature rises first. Since the conductive track 2 is a positive temperature coefficient thermistor, the resistance value of the conductive track branch in this branch heating area will gradually increase with temperature and the current will gradually decrease, and the current will be distributed to other branches with smaller resistance; the conductive track branch in the branch heating area that generates the second largest heat per unit length when the power is first turned on, that is, the conductive track branch with the second smallest resistance value when the power is first turned on, is allocated more current, the current gradually increases, and the branch heating area where it is located generates more heat per unit length. The heat generated gradually increases, and the temperature gradually rises. Similarly, because conductive track 2 is a positive temperature coefficient thermistor, the resistance of this conductive track branch gradually increases, and the current gradually decreases, distributing the current to other branches with smaller resistance. The conductive track branch in the branch heating area with the third largest heat generated per unit length when power is first applied (i.e., the conductive track branch with the third smallest resistance when power is first applied) is allocated more current, and the current gradually increases. The heat generated per unit length in this branch heating area gradually increases, and the temperature gradually rises. Later, because conductive track 2 is a positive temperature coefficient thermistor, the resistance of this conductive track branch gradually increases, and the current gradually decreases. And so on. This achieves the sequential heating of multiple conductive track branches, heating tobacco segments in sections. During the process of smoking a cigarette, the uniformity of smoke release over time is improved, avoiding excessive smoke release in the early stages and insufficient smoke release in the later stages.

[0057] Preferably, in a direction from far away to close to the fixed area, the heat generated per unit length of the plurality of branch heating areas decreases one by one when power is first turned on.

[0058] Furthermore, in the direction from far away to close to the fixed area, the initial resistance of the conductive track branches in each branch heating area can be set to decrease one by one to achieve a decrease in the heat generated per unit length. For example, Figure 5 FIG. 2 is a schematic diagram of the conductive track 2 on the side of the substrate 1 unfolded into a plane state, as shown in FIG. Figure 5As shown, there are three conductive track branches. From farther away from the fixed area to closer to it, the three conductive track branches are: first conductive track branch 21, second conductive track branch 22, and third conductive track branch 23, whose resistance increases in sequence when power is first applied. These branches are located in first branch heating area d, second branch heating area e, and third branch heating area f, respectively. When power is first applied, the heat generated per unit length in first branch heating area d exceeds that in second branch heating area e, and exceeds that in third branch heating area f. When power is first applied, because first branch heating area d generates the most heat per unit length, its temperature rises first compared to the other branch heating areas, and its corresponding tobacco segment is heated first. Because this tobacco segment is farthest from the fixed area and closest to the cigarette holder compared to the other tobacco segments, the distance and time that the user's first puff of smoke travels through the airflow channel are minimized, thereby improving smoke response speed. Because the conductive track 2 is a positive temperature coefficient thermistor, the resistance of the first conductive track branch 21 gradually increases with temperature, the current on the first conductive track branch 21 gradually decreases, and the current is distributed to other branches with smaller resistance; the current in the second conductive track branch 22 gradually increases, the heat generated per unit length of the second branch heating area e gradually increases, and the temperature of the second branch heating area e gradually rises. Later, because the conductive track 2 is a positive temperature coefficient thermistor, the resistance of the second conductive track branch 22 gradually increases, and the current in the second conductive track branch 22 gradually decreases; the current in the third conductive track branch 23 gradually increases, the heat generated per unit length of the third branch heating area f gradually increases, and the temperature of the third branch heating area f gradually rises. Later, because the conductive track 2 is a positive temperature coefficient thermistor, the resistance of the third conductive track branch 23 gradually increases, and the current in the third conductive track branch 23 gradually decreases. Thus, the first conductive track branch 21, the second conductive track branch 22, and the third conductive track branch 23 are heated in sequence, and the tobacco segments are heated in sequence. During the process of smoking a cigarette, the uniformity of smoke release over time is improved, avoiding excessive smoke release in the early stage and insufficient smoke release in the later stage.

[0059] Optionally, the conductive track 2 may be made of a silver-palladium alloy and / or a tungsten alloy. Silver-palladium alloy and tungsten alloy are not only positive temperature coefficient thermistors but also high electro-thermal efficiency materials, which can improve the efficiency of converting electrical energy from the conductive track 2 into thermal energy, thereby increasing the utilization rate of electrical energy.

[0060] Furthermore, the installation and manufacturing process of the heater is as follows: 1. Sintering the insulating layer 6 on the ground substrate 1. 2. Etching the conductive track 2 on the insulating layer 6 and sintering to form a heating area. 3. Sintering the electrode 3 on the insulating layer 6 to connect the conductive track 2. 4. Sintering another layer of insulating layer 6 on the conductive track 2 (be careful to avoid the position of the electrode 3). 5. Welding the electrode 3 and the wire 5 through the solder (welding method 1: first apply a gel solder, such as silver paste, on the electrode 3, and then install the wire 5 on the electrode 3 and the gel solder, and then sinter at high temperature. Welding method 2: First install the wire 5, and then use a clamp to fix the relative position of the wire 5 and the electrode 3, and then apply the gel solder at the position where the wire 5 contacts the electrode 3, and then sinter at high temperature). 6. Install the base 4.

[0061] The present invention also provides a smoking device, characterized in that it includes the above-mentioned heater, so that each tobacco segment (especially the tobacco segment heated by the heating area near the base 4) is fully heated and the smoke release rate is high, avoiding the problem of the smoking device being scalded due to the excessive temperature of the base 4, and can realize segmented heating of the cigarettes, thereby improving the uniformity of smoke release over time during the smoking process.

[0062] The present invention also provides a heater, comprising: a substrate 1, whose surface includes a heating area and a fixed area; a conductive track 2, arranged in the heating area; two electrodes 3, respectively connected to the two ends of the conductive track 2; wherein the conductive track 2 is connected in series between the two electrodes 3, and the extension direction of the substrate 1 is defined as the length direction. The heating area is provided with a first heating area a and a second heating area b in sequence along the length direction from close to to far away from the fixed area, and the heat generated per unit length by the first heating area a is greater than the heat generated per unit length by the second heating area b.

[0063] Optionally, controlling the amount of heat generated per unit length in different heating areas can be achieved by changing the resistance of the conductive track 2 in each area. Since the conductive track 2 is connected in series between the two electrodes 3, and given a constant area in each area, the amount of heat generated per unit length in each area increases as the resistance of the conductive track 2 in that area increases. Changing the resistance of the conductive track 2 can be achieved by changing the material, width, or length of the conductive track 2. From the perspective of ease of processing, preferably, the amount of heat generated per unit length in different heating areas is changed by controlling the length and width of the conductive track 2, such that the width of the conductive track 2 in the first heating area a is smaller than the width of the conductive track 2 in the second heating area b, and / or the length of the conductive track 2 in the first heating area a is greater than the length of the conductive track 2 in the second heating area b.

[0064] Figure 3 FIG. 2 is a schematic diagram showing the conductive track 2 on the side of the substrate 1 unfolded into a planar state. Figure 3As shown, the heat generated per unit length in the first heating area a is greater than the heat generated per unit length in the second heating area b, thereby compensating for the heat loss in the first heating area a caused by heat conduction from the substrate 1 to the base 4, preventing the temperature of the first heating area a from being lower than that of the second heating area b, and improving the temperature uniformity of the heating areas, so that the tobacco segment heated by the first heating area a is fully heated and the smoke release rate is high.

[0065] Optionally, the heater can be a needle heater or a sheet heater. In order to improve the anti-bending performance of the heater, a needle heater is preferably used.

[0066] Optionally, a third heating region c is further provided on a side of the second heating region b away from the first heating region a, and the heat generated per unit length by the third heating region c is greater than the heat generated per unit length by the second heating region b.

[0067] Optionally, the width of the conductive track 2 located in the first heating area a is smaller than the width of the conductive track 2 located in the second heating area b, and / or the length of the conductive track 2 located in the first heating area a is greater than the length of the conductive track 2 located in the second heating area b;

[0068] and, the width of the conductive track 2 located in the third heating area c is smaller than the width of the conductive track 2 located in the second heating area b, and / or the length of the conductive track 2 located in the third heating area c is greater than the length of the conductive track 2 located in the second heating area b.

[0069] Figure 4 FIG. 2 is a schematic diagram showing the conductive track 2 on the side of the substrate 1 unfolded into a planar state. Figure 4 As shown, the heat generated per unit length in the first heating area a is greater than the heat generated per unit length in the second heating area b, and the heat generated per unit length in the third heating area c is greater than the heat generated per unit length in the second heating area b, thereby compensating for the heat loss in the first heating area a caused by heat conduction from the substrate 1 to the base 4 and the heat loss in the third heating area c caused by the lack of the conductive track 2 at the needle tip of the substrate 1, avoiding the temperature of the first heating area a and the third heating area c being lower than the second heating area b, improving the temperature uniformity of the heating areas, and ensuring that the tobacco segments heated by the first heating area a and the third heating area c are fully heated and have a high smoke release rate.

[0070] The present invention also provides a heater, comprising: a substrate 1, whose surface includes a heating area and a fixing area; a conductive track 2, arranged in the heating area; two electrodes 3, respectively connected to the two ends of the conductive track 2; wherein the conductive track 2 is a positive temperature coefficient thermistor, and the conductive track 2 is connected in parallel between the two electrodes 3 to form multiple conductive track branches, the extension direction of the substrate 1 is defined as the length direction, each branch heating area includes at least one conductive track branch, and the multiple conductive track branches are respectively located in multiple branch heating areas, and the heat generated per unit length of the multiple branch heating areas when power is first applied is different.

[0071] Specifically, since the multiple conductive track branches are formed by the conductive track 2 connected in parallel between the two electrodes 3, the initial resistance (i.e., the resistance value when not heated) of the multiple conductive track branches can be set to be different. When the power is first turned on, the smaller the resistance value of the conductive track branch, the greater the current and power, and the greater the heat generated per unit length in the branch heating area where it is located. After the power is turned on, the branch heating area that generates the most heat per unit length when the power is first turned on, that is, the branch heating area where the conductive track branch with the smallest resistance value when the power is first turned on is located, will first increase in temperature. Since the conductive track 2 is a positive temperature coefficient thermistor, the resistance of the conductive track branch in this branch heating area will gradually increase with temperature, the current will gradually decrease, and the current will be distributed to other branches; the conductive track branch in the branch heating area that generates the second most heat per unit length when the power is first turned on, that is, the conductive track branch with the second smallest resistance value when the power is first turned on, will be allocated more current, the current will gradually increase, and the branch heating area where it is located will generate more heat per unit length. The heat gradually increases, and the temperature gradually rises. Later, because conductive track 2 is a positive temperature coefficient thermistor, the resistance of this conductive track branch gradually increases, and the current gradually decreases, distributing the current to other branches with smaller resistance. The conductive track branch in the branch heating area with the third largest heat generation per unit length at the beginning of power-on (i.e., the conductive track branch with the third smallest resistance at the beginning of power-on) is allocated more current, and the current gradually increases. The heat generated per unit length in this branch heating area gradually increases, and the temperature gradually rises. Later, because conductive track 2 is a positive temperature coefficient thermistor, the resistance of this conductive track branch gradually increases, and the current gradually decreases. And so on. This achieves the sequential heating of multiple conductive track branches, heating tobacco segments in sections. During the process of smoking a cigarette, the uniformity of smoke release over time is improved, avoiding excessive smoke release in the early stages and insufficient smoke release in the later stages.

[0072] Preferably, in a direction from far away to close to the fixed area, the heat generated per unit length of the plurality of branch heating areas decreases one by one when power is first turned on.

[0073] Furthermore, in the direction from far away to close to the fixed area, the initial resistance of the conductive track branches in each branch heating area can be set to decrease one by one to achieve a decrease in the heat generated per unit length. For example, Figure 5 FIG. 2 is a schematic diagram of the conductive track 2 on the side of the substrate 1 unfolded into a plane state, as shown in FIG. Figure 5 As shown, there are three conductive track branches. From farther away from the fixed area to closer to it, the three conductive track branches are: first conductive track branch 21, second conductive track branch 22, and third conductive track branch 23, whose resistance increases in sequence when power is first applied. These branches are located in first branch heating area d, second branch heating area e, and third branch heating area f, respectively. When power is first applied, the heat generated per unit length in first branch heating area d exceeds that in second branch heating area e, and exceeds that in third branch heating area f. When power is first applied, because first branch heating area d generates the most heat per unit length, its temperature rises first compared to the other branch heating areas, and its corresponding tobacco segment is heated first. Because this tobacco segment is farthest from the fixed area and closest to the cigarette holder compared to the other tobacco segments, the distance and time that the user's first puff of smoke travels through the airflow channel are minimized, thereby improving smoke response speed. Because the conductive track 2 is a positive temperature coefficient thermistor, the resistance of the first conductive track branch 21 gradually increases, and the current on the first conductive track branch 21 gradually decreases; the current in the second conductive track branch 22 gradually increases, the heat generated per unit length of the second branch heating area e gradually increases, and the temperature of the second branch heating area e gradually rises. Later, because the conductive track 2 is a positive temperature coefficient thermistor, the resistance of the second conductive track branch 22 gradually increases, and the current on the second conductive track branch 22 gradually decreases; the current in the third conductive track branch 23 gradually increases, the heat generated per unit length of the third branch heating area f gradually increases, and the temperature of the third branch heating area f gradually rises. Later, because the conductive track 2 is a positive temperature coefficient thermistor, the resistance of the third conductive track branch 23 gradually increases, and the current on the third conductive track branch 23 gradually decreases. Thus, the first conductive track branch 21, the second conductive track branch 22, and the third conductive track branch 23 are heated in sequence, and the tobacco segments are heated in sequence. During the process of smoking a cigarette, the uniformity of smoke release over time is improved, avoiding excessive smoke release in the early stage and insufficient smoke release in the later stage.

[0074] Optionally, the conductive track 2 may be made of a silver-palladium alloy and / or a tungsten alloy. Silver-palladium alloy and tungsten alloy are not only positive temperature coefficient thermistors but also high electro-thermal efficiency materials, which can improve the efficiency of converting electrical energy from the conductive track 2 into thermal energy, thereby increasing the utilization rate of electrical energy.

[0075] To sum up, by setting the base 4 to be non-contact with the conductive track 2 and the two electrodes 3, the conductive track 2 or the electrode 3 is prevented from directly conducting heat to the base 4, and the heat loss in the heating area near the base 4 is reduced, thereby increasing the temperature of the heating area near the base 4 and improving the temperature uniformity of the heating area. The tobacco segment heated in the heating area near the base 4 is fully heated and the smoke release rate is high. At the same time, it avoids the base 4 from being too hot and conducting heat to the outer shell of the smoking device, causing the smoking device to be hot.

[0076] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A heater, characterized in that: include: a substrate having a surface including a heating area and a fixing area; a conductive track disposed in the heating area; an electrode connected to the conductive track; A base, connected to the fixing area, for fixing the base, wherein the base is not in contact with the conductive track or the electrode; A hollow cavity is provided inside the base to reduce energy loss of the base itself and heat conduction from the base to the outside; a wire, wherein both ends of the wire are respectively connected to the electrode and a power source to form an electrical circuit, and the wire is led out of the hollow cavity; The electrode is arranged on one end of the heating area away from the fixing area.

2. The heater according to claim 1, wherein The conductive track is connected in series with the electrode, wherein the extension direction of the substrate is defined as the length direction, and the heating area is provided with a first heating area and a second heating area in sequence along the length direction from close to to far away from the fixed area, and the heat generated per unit length by the first heating area is greater than the heat generated per unit length by the second heating area.

3. The heater according to claim 2, characterized in that The width of the conductive track at the first heating zone is smaller than the width of the conductive track at the second heating zone, and / or the length of the conductive track at the first heating zone is greater than the length of the conductive track at the second heating zone.

4. The heater according to claim 2, characterized in that A third heating region is further provided on a side of the second heating region away from the first heating region. The heat generated per unit length by the third heating region is greater than the heat generated per unit length by the second heating region.

5. The heater according to claim 4, characterized in that The width of the conductive track located in the first heating zone is smaller than the width of the conductive track located in the second heating zone, and / or the length of the conductive track located in the first heating zone is greater than the length of the conductive track located in the second heating zone; and, the width of the conductive track located in the third heating zone is smaller than the width of the conductive track located in the second heating zone, and / or the length of the conductive track located in the third heating zone is greater than the length of the conductive track located in the second heating zone.

6. The heater according to claim 1, wherein The conductive track is a positive temperature coefficient thermistor, and the conductive track is connected in parallel with the electrode to form multiple conductive track branches, wherein the extension direction of the substrate is defined as the length direction, and the heating area is divided into multiple branch heating areas along the length direction. Each branch heating area is provided with at least one conductive track branch, and the heat generated per unit length by the multiple branch heating areas when power is first applied is different.

7. The heater according to claim 6, characterized in that In a direction from away from the fixed area to close to the fixed area, the heat generated per unit length of the multiple branch heating areas decreases one by one when power is first turned on.

8. The heater according to claim 7, characterized in that The conductive traces are made of materials including silver-palladium alloy and / or tungsten alloy.

9. A smoking article, characterized in that: The heater comprises the heater described in any one of claims 1 to 8.

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