Heat-generating core, liquid heating device and liquid heating system

Abstract

This application provides a heating element, a liquid heating device, and a liquid heating system, belonging to the field of liquid heating systems. The heating element includes a substrate, a first heating element, and a second heating element. The substrate has a first surface and a second surface opposite each other in a first direction. The porosity of the substrate decreases along the first direction from the first surface to the second surface. The second heating element is disposed on the second surface, and the first heating element is embedded in the substrate and located between the first surface and the second surface. By embedding the first heating element in the substrate and disposing it between the first and second surfaces, the liquid matrix can be preheated using the first heating element. For liquid matrices with high viscosity, preheating can improve fluidity, facilitating the flow of the liquid matrix towards areas with lower porosity, reducing the risk of flow interruption, and thus improving the situation where the liquid matrix supply is interrupted.

Description

Technical Field

[0001] This application relates to the field of liquid heating systems, and in particular to a heating element, a liquid heating device, and a liquid heating system. Background Technology

[0002] A typical liquid heating system includes a liquid heating device and a power supply component, with the liquid heating device connected to the power supply component. During operation, the power supply component supplies power to the liquid heating device. The liquid heating device includes a liquid storage component and a heating element. The liquid storage component stores the liquid matrix, which permeates into the heating element. During operation, the heating element generates heat, thereby heating the liquid matrix to produce a vapor.

[0003] A common heating element includes a substrate and a heating element, with the heating element disposed on one side of the substrate. The substrate has a porous structure, and during use, a liquid matrix seeps into the substrate from the side away from the heating element and flows towards the heating element. The heating element heats the liquid matrix seeping from the substrate, thereby forming an aerosol.

[0004] The matrix relies on capillary forces generated by its porous structure to transport the liquid matrix. For liquid matrices with high viscosity, the poor fluidity and high flow resistance within the matrix can easily lead to interruptions in the transport of the liquid matrix, resulting in problems such as dry burning and scorching of the heating core. Summary of the Invention

[0005] This application provides a heating element, a liquid heating device, and a liquid heating system, which can improve the situation when the liquid matrix supply is interrupted and reduce the occurrence of adverse conditions such as dry burning and scorching. The technical solution is as follows: In a first aspect, embodiments of this application provide a heating element, the heating element including a substrate, a first heating element and a second heating element, the substrate having a first surface and a second surface opposite each other in a first direction, the porosity of the substrate decreasing from the first surface to the second surface along the first direction, the second heating element being disposed on the second surface, and the first heating element being embedded in the substrate and located between the first surface and the second surface.

[0006] In some examples, the porosity of the matrix varies continuously or in a layered gradient along the first direction.

[0007] In some examples, the first heating element and the second heating element are connected in parallel.

[0008] In some examples, the heating element further includes a first electrical connection portion and a second electrical connection portion, which are respectively embedded in the substrate and are respectively disposed along the first direction; One pole of the first heating element and one pole of the second heating element are electrically connected to the first electrical connection portion, and the other poles of the first heating element and the second heating element are electrically connected to the second electrical connection portion.

[0009] In some examples, there are multiple first heating elements, which are arranged at intervals along the first direction.

[0010] In some examples, the resistance of the plurality of first heating elements decreases sequentially along the first direction from the first surface to the second surface.

[0011] In some examples, the substrate includes a plurality of sub-substrates, which are stacked sequentially along the first direction.

[0012] In some examples, the first heating element is located between two adjacent sub-sub ...

[0013] In some examples, the plurality of sub-sub-substrates include a first sub-sub-substrate, a second sub-sub-substrate, and a third sub-sub-substrate stacked sequentially along the first direction, and the second heating element is disposed on the side of the third sub-sub-substrate opposite to the second sub-sub-substrate; The porosity of the first sub-matrix ranges from 60% to 70%, the porosity of the second sub-matrix ranges from 50% to 60%, and the porosity of the third sub-matrix ranges from 40% to 50%.

[0014] Secondly, embodiments of this application also provide a liquid heating device, which includes a liquid storage component and any of the heating elements described in the first aspect, wherein the heating element is located in the liquid storage component.

[0015] Thirdly, embodiments of this application also provide a liquid heating system, the liquid heating system including a power supply component and any of the liquid heating devices as described in the second aspect, the power supply component being used to supply power to the heating core.

[0016] The beneficial effects of the technical solutions provided in this application include at least the following: By providing a substrate with a first surface and a second surface, the liquid matrix can penetrate from the first surface into the substrate and flow to the second surface. A second heating element is disposed on the second surface of the substrate, allowing it to heat the liquid matrix penetrating from the substrate and form an aerosol. Since the porosity of the substrate decreases along a first direction from the first surface to the second surface, the larger porosity near the first surface facilitates the penetration of the liquid matrix. By embedding the first heating element in the substrate and placing it between the first and second surfaces, the liquid matrix can be preheated. For high-viscosity liquid matrices, preheating improves fluidity, promoting flow towards areas with smaller porosity and reducing the risk of flow interruption, thus improving the situation where liquid matrix delivery is interrupted. The smaller porosity near the second surface also allows the substrate to retain the liquid matrix, ensuring that high-viscosity liquid matrix can flow to the second heating element while reducing the risk of liquid accumulation on the second surface. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a heating element provided in an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of a heating element provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a first heating element provided in an embodiment of this application; Figure 4 This is a schematic diagram of the internal structure of another heating element provided in an embodiment of this application; Figure 5 This is a schematic diagram of a liquid heating system provided in an embodiment of this application.

[0019] Icon labels: 100-Heating core, 110-Substrate, 111-First surface, 112-Second surface, 120-First heating element, 130-Second heating element, 131-Heating part, 132-First electrode part, 133-Second electrode part, 140-First electrical connection part, 150-Second electrical connection part, 160-Sub-substrate, 161-First sub-substrate, 162-Second sub-substrate, 163-Third sub-substrate, 200-Liquid heating device, 210-Liquid storage assembly, 300-Liquid heating system, 310-Power supply assembly, X-First direction. Detailed Implementation

[0020] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0021] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" means two or more.

[0026] A liquid heating system typically includes a liquid heating device and a power supply component. The liquid heating device is connected to the power supply component, which provides electrical energy to the liquid heating device. The liquid heating device includes a liquid storage component and a heating element. The liquid storage component stores the liquid matrix, which can enter the heating element. The heating element heats the liquid matrix to form a vapor. The liquid matrix can be originally liquid or a solid substance that transforms into a liquid state under certain conditions (such as temperature).

[0027] In some heating elements, the heating element includes a substrate and a heating element disposed on the substrate. The substrate is typically a porous structure. During operation, the liquid matrix in the liquid storage assembly can be transported towards the heating element through capillary action of the substrate. The heating element heats the liquid matrix in the substrate, thereby forming an aerosol.

[0028] However, the pores in the matrix typically need to balance liquid storage and conductivity. When the viscosity of the liquid matrix is ​​low, such as 5 mPa•s to 20 mPa•s, the matrix can stably supply the liquid matrix to the heating element. When the viscosity of the liquid matrix is ​​high, the flow resistance of the liquid matrix in the matrix is ​​large. When relying on capillary action for transport, the liquid matrix transport speed is prone to decrease or even interruption, resulting in insufficient liquid supply near the heating element, and thus causing problems such as dry burning and scorching.

[0029] To address the aforementioned technical problems, this application provides a heating element. Figure 1 This is a schematic diagram of the structure of a heating element provided in an embodiment of this application, as shown below. Figure 1 As shown, the heating element 100 includes a substrate 110, a first heating element 120, and a second heating element 130. The substrate 110 has a first surface 111 and a second surface 112 disposed opposite to each other in a first direction X.

[0030] In this embodiment, the first direction X can be the thickness direction of the substrate 110. The liquid matrix can enter the substrate 110 from the first surface 111 and be transported along the first direction X toward the second surface 112.

[0031] In one example, the substrate 110 may be made of porous ceramic, porous glass, or other materials with a porous structure. The substrate 110 has a porous structure with multiple pores inside, and the liquid matrix can be transported inside the substrate 110 by capillary action generated by the pores.

[0032] The porosity of the substrate 110 decreases along the first direction X from the first surface 111 to the second surface 112.

[0033] By gradually reducing the porosity of the substrate 110 along the first direction X, the side of the substrate 110 near the first surface 111 can have a larger pore structure.

[0034] The liquid matrix in the liquid storage assembly enters from the side where the first surface 111 of the substrate 110 is located. The larger porosity is beneficial to improving the absorption capacity of the substrate 110 for the liquid matrix, making it easier for the liquid matrix to enter the interior of the substrate 110.

[0035] As the liquid matrix flows along the first direction X toward the second surface 112, the porosity of the substrate 110 near the second surface 112 gradually decreases. The smaller porosity can improve the substrate 110's ability to retain the liquid matrix, allowing the liquid matrix to accumulate near the second surface 112, while reducing the possibility of a large accumulation of liquid matrix at the second surface 112 to form a pool.

[0036] like Figure 1 As shown, the second heating element 130 is disposed on the second surface 112. The first heating element 120 is embedded in the substrate 110 and is located between the first surface 111 and the second surface 112.

[0037] The second heating element 130 is used to heat the liquid matrix transported from the substrate 110 to the second surface 112, causing the liquid matrix to transform into a vapor. The first heating element 120 is used to heat the liquid matrix inside the substrate 110 to increase its temperature. For liquid matrices with high viscosity, the viscosity decreases and the fluidity increases as the temperature rises. Therefore, preheating the liquid matrix inside the substrate 110 by the first heating element 120 can reduce the resistance encountered by the liquid matrix when flowing inside the substrate 110, making it easier for the liquid matrix to be transported towards the second surface 112. When the preheated liquid matrix reaches the vicinity of the second surface 112, the second heating element 130 can further heat the liquid matrix to form a vapor.

[0038] This embodiment of the application gradually reduces the porosity of the substrate 110 along the liquid matrix transport direction, and provides a first heating element 120 located inside the substrate 110 and a second heating element 130 located on the surface of the substrate 110. The first heating element 120 preheats the liquid matrix flowing towards the second heating element 130, improving the fluidity of the liquid matrix. Simultaneously, the second heating element 130 heats the seeping liquid matrix, thereby improving the problem of poor transport of high-viscosity liquid matrix. Compared to a structure where the heating element is only located on the second surface 112, providing the first heating element 120 inside the substrate 110 allows the liquid matrix to be preheated before reaching the main heating area, which helps improve the stability of the liquid supply and reduces the possibility of dry burning or scorching due to insufficient liquid supply.

[0039] In some examples, the porosity of the matrix 110 can vary continuously along the first direction X.

[0040] For example, the porosity of the substrate 110 is larger on the side closer to the first surface 111, and gradually decreases along the first direction X toward the second surface 112, so that the substrate 110 forms a continuously changing pore structure.

[0041] In some examples, the porosity of the matrix 110 can vary in a layered gradient.

[0042] For example, the substrate 110 may include multiple regions with different porosities, and the porosity of each region gradually decreases along the first direction X from the first surface 111 to the second surface 112.

[0043] A continuously varying pore structure is more conducive to the smooth flow of the liquid matrix in the substrate 110, while a layered gradient of porosity is more conducive to the fabrication of the substrate 110 and has a lower cost.

[0044] In some examples, the substrate 110 may include a plurality of sub-substrates 160. The plurality of sub-substrates 160 are stacked sequentially along a first direction X.

[0045] By setting the matrix 110 as a multi-submatrix 160 stacked together, the porosity of the overall matrix 110 can be adjusted to form a structure in which the porosity varies along the first direction X.

[0046] For example, the plurality of sub-substrates 160 may include a first sub-substrate 161, a second sub-substrate 162, and a third sub-substrate 163 sequentially stacked along a first direction X. A second heating element 130 is disposed on the side of the third sub-substrate 163 opposite to the second sub-substrate 162. A first surface 111 is located on the first sub-substrate 161, and a second surface 112 is located on the third sub-substrate 163. The porosity of the first sub-substrate 161 is greater than the porosity of the second sub-substrate 162, and the porosity of the second sub-substrate 162 is greater than the porosity of the third sub-substrate 163.

[0047] With the above configuration, the liquid matrix can enter from the first sub-sub ...

[0048] In some examples, multiple sub-substrates 160 can be formed into a single structure by sintering, pressing, bonding or other means.

[0049] For example, a first sub-matrix 161, a second sub-matrix 162, and a third sub-matrix 163 with different porosities can be prepared respectively, and then stacked and connected sequentially along the first direction X to form a matrix 110 with a gradient pore structure.

[0050] In other examples, the substrate 110 can also be prepared by a one-time molding process, and different regions can have different porosities during the molding process, thereby forming a continuously varying or layered gradient pore structure.

[0051] By employing different methods to form a gradient pore structure, the liquid absorption capacity, liquid conduction capacity, and liquid retention capacity of the matrix 110 can be adjusted according to actual product requirements.

[0052] For example, the porosity of the first sub-substrate 161 can be 60% to 70%, the porosity of the second sub-substrate 162 can be 50% to 60%, and the porosity of the third sub-substrate 163 can be 40% to 50%.

[0053] For example, the porosity of the first sub-matrix 161 can be 65%, the porosity of the second sub-matrix 162 can be 55%, and the porosity of the third sub-matrix 163 can be 45%.

[0054] For example, the average pore size of the first sub-substrate 161 can be 45 μm to 55 μm; the average pore size of the second sub-substrate 162 can be 25 μm to 35 μm; and the average pore size of the third sub-substrate 163 can be 8 μm to 15 μm.

[0055] In this example, the first sub-substrate 161 is located close to the liquid storage assembly and has a large porosity, which improves its absorption capacity of the liquid matrix, allowing the liquid matrix to quickly enter the substrate 110. The second sub-substrate 162 is located between the first sub-substrate 161 and the third sub-substrate 163, and can play a transitional transport role for the liquid matrix. The third sub-substrate 163 is located close to the second surface 112 and has a small porosity, which improves its retention capacity of the liquid matrix, allowing the liquid matrix to be maintained in an appropriate amount near the second heating element 130.

[0056] By making the multiple sub-matrixes 160 have gradually decreasing porosity, a gradient pore structure that matches the liquid matrix transport direction can be formed in the matrix 110, so that the matrix 110 has good liquid absorption capacity, liquid conduction capacity and liquid retention capacity at the same time.

[0057] The first heating element 120 may be located between two adjacent sub-sub ...

[0058] For example, Figure 2 This is a schematic diagram of the internal structure of a heating element provided in an embodiment of this application, as shown below. Figure 2 As shown, in this example, the first heating element 120 can be disposed between the second sub-subbase 162 and the third sub-subbase 163. In some other possible implementations, the first heating element 120 can also be disposed inside the second sub-subbase 162.

[0059] When the first heating element 120 is disposed between two adjacent sub-sub ...

[0060] When the first heating element 120 is disposed inside the sub-substrate 160, the first heating element 120 can be embedded therein during the preparation of the sub-substrate 160, so that the first heating element 120 and the substrate 110 form an integral structure.

[0061] With the above settings, the position of the first heating element 120 can be adjusted according to the manufacturing process and heating requirements, so that the first heating element 120 can better preheat the liquid matrix.

[0062] The first heating element 120 and the second heating element 130 can be made of metallic heating materials, such as metal wires, metal sheets, metal mesh or other structures that can generate heat.

[0063] The first heating element 120 and the second heating element 130 can be formed by a metal etching patch process or a thick film process. For example, they can be formed by screen printing with a nickel-chromium alloy or other metal paste.

[0064] To allow for temperature adjustment as needed, the first heating element 120 and the second heating element 130 can also be made of materials with TCR (Temperature Coefficient of Resistance) characteristics. For example, they can be made of PTC (Positive Temperature Coefficient) material. During the operation of the heating core 100, the temperatures of the first heating element 120 and the second heating element 130 can be determined based on their resistance and the TCR.

[0065] The first heating element 120 and the second heating element 130 can also be porous structures, thereby reducing the obstruction effect of the first heating element 120 and the second heating element 130 on the liquid matrix.

[0066] In some examples, the first heating element 120 and the second heating element 130 can be connected in parallel.

[0067] Connecting the first heating element 120 and the second heating element 130 in parallel facilitates the simultaneous operation of the first heating element 120 and the second heating element 130.

[0068] In other examples, the first heating element 120 and the second heating element 130 can also be independent of each other, so that the first heating element 120 and the second heating element 130 can operate separately. For example, the first heating element 120 can operate earlier than the second heating element 130, so that the liquid matrix inside the substrate 110 is preheated first, and then the second heating element 130 heats the liquid matrix.

[0069] like Figure 2 As shown, the heating element 100 may further include a first electrical connection portion 140 and a second electrical connection portion 150. The first electrical connection portion 140 and the second electrical connection portion 150 are respectively embedded in the substrate 110, and the first electrical connection portion 140 and the second electrical connection portion 150 are respectively disposed along a first direction X.

[0070] One pole of the first heating element 120 and one pole of the second heating element 130 are electrically connected to the first electrical connection portion 140. The other poles of the first heating element 120 and the second heating element 130 are electrically connected to the second electrical connection portion 150.

[0071] In this example, the first heating element 120 and the second heating element 130 can form a parallel circuit through the first electrical connection portion 140 and the second electrical connection portion 150. Since the first heating element 120 and the second heating element 130 are located at different positions on the substrate 110, by being arranged in parallel, the first heating element 120 and the second heating element 130 can simultaneously obtain electrical energy and perform heating, thereby enabling the first heating element 120 to continuously preheat the liquid matrix inside the substrate 110, while the second heating element 130 heats the liquid matrix at the second surface 112.

[0072] As an example, the first electrical connection portion 140 and the second electrical connection portion 150 can be an electrode post, an electrode sheet, or other conductive structure.

[0073] For example, the first electrical connection portion 140 and the second electrical connection portion 150 can both be electrode posts. The first electrical connection portion 140 and the second electrical connection portion 150 can be disposed along the first direction X through a portion of the thickness of the substrate 110, and are respectively electrically connected to the first heating element 120 and the second heating element 130.

[0074] By embedding the first electrical connection portion 140 and the second electrical connection portion 150 into the substrate 110, the space occupied by the exposed conductive structure can be reduced, making the overall structure of the heating core 100 more compact.

[0075] In some examples, at least a portion of the first heating element 120 and the second heating element 130 may be made of one or more materials selected from Al, Ti / Au, Ti / Pt, Ti / TiN / Au, Ti / TiN / Pt, Ta / Au, Ta / Pt, Ta / TaN / Au, and Ta / TaN / Pt.

[0076] For example, the second heating element 130 may include a first electrode portion 132, a second electrode portion 133, and a heating portion 131, wherein the first electrode portion 132 and the second electrode portion 133 are respectively connected to the heating portion 131. The first electrode portion 132 and the second electrode portion 133 are used to electrically connect to a power supply structure to supply power to the heating portion 131, causing the heating portion 131 to heat up. The first electrode portion 132 may be connected to a first electrical connection portion 140, and the second electrode portion 133 may be connected to a second electrical connection portion 150.

[0077] As an example, the heating element 131 may include a heating mesh, with its two ends connected to the first electrode element 132 and the second electrode element 133, respectively. The mesh shape of the heating mesh may be circular, elliptical, polygonal, etc. For example, it may be rhomboid.

[0078] The heating element 131 can be made of one or more of the aforementioned materials: Al, Ti / Au, Ti / Pt, Ti / TiN / Au, Ti / TiN / Pt, Ta / Au, Ta / Pt, Ta / TaN / Au, and Ta / TaN / Pt.

[0079] In other examples, the heating element 131 may also be formed of one or more alloys of Fe, Ni, and Cr to reduce costs.

[0080] The first electrode portion 132 and the second electrode portion 133 can be made of a material with a lower resistivity than the material of the heating portion 131, so as to reduce the resistance of the first electrode portion 132 and the second electrode portion 133 and reduce the heat generation of the first electrode portion 132 and the second electrode portion 133.

[0081] For example, the first electrode portion 132 and the second electrode portion 133 may be made of Ag or a material with a silver-plated surface.

[0082] The first electrode 132 and the second electrode 133 can also be made of the same material as the heating element 131, so that the first electrode 132, the second electrode 133 and the heating element 131 can be manufactured in the same process, thereby reducing the process cost.

[0083] As an example, the first heating element 120 may be in the form of a mesh. Figure 3 This is a schematic diagram of the structure of a first heating element provided in an embodiment of this application, as shown below. Figure 3As shown, the first heating element 120 can also be S-shaped.

[0084] Figure 4 This is a schematic diagram of the internal structure of another heating element provided in an embodiment of this application, as shown below. Figure 4 As shown, in the heating core 100, multiple first heating elements 120 can be provided, and the multiple first heating elements 120 are arranged sequentially at intervals along the first direction X. That is, the multiple first heating elements 120 can be located at different depths inside the substrate 110.

[0085] During operation, the first heating element 120 near the first surface 111 can preheat the liquid matrix that has just entered the substrate 110. The first heating element 120 located closer to the second surface 112 can further increase the temperature of the liquid matrix, so that the liquid matrix can be transported more smoothly to the second surface 112.

[0086] By setting multiple first heating elements 120, the preheating area inside the substrate 110 can be increased, the preheating effect on the liquid matrix can be improved, and the liquid matrix with high viscosity can flow stably in the first direction X in the substrate 110.

[0087] In some examples, the resistance of the plurality of first heating elements 120 can be decreased sequentially along the first direction X from the first surface 111 to the second surface 112. The resistance of the first heating element 120 affects the power of the first heating element 120 when it heats up.

[0088] For example, the plurality of first heating elements 120 may include a first preheating element, a second preheating element, and a third preheating element arranged sequentially along the first direction X, wherein the resistance of the third preheating element is less than the resistance of the second preheating element, and the resistance of the second preheating element is less than the resistance of the first preheating element. Under the same supply voltage, the first heating element 120 with lower resistance can generate greater heating power, thereby giving the region near the second surface 112 a higher preheating capacity.

[0089] After the first heating element 120 and the second heating element 130 are connected in parallel, the multiple first heating elements 120 are also connected in parallel with each other. The first heating element 120 with smaller resistance has greater power, and the first heating element 120 with larger resistance has less power. This can make the power of the multiple first heating elements 120 gradually increase along the first direction X from the first surface 111 to the second surface 112 when the heating core 100 is heating.

[0090] The above configuration creates a progressively stronger preheating effect within the substrate 110, which helps improve the insufficient flowability of high-viscosity liquid matrices during transport within the substrate 110. The closer to the second surface 112 within the substrate 110, the smaller the porosity, and the greater the resistance encountered by the liquid matrix during flow. Using higher power for preheating in areas with lower porosity can further reduce the viscosity of the liquid matrix in those areas, improve flowability, and reduce the risk of flow interruption.

[0091] For example, the heating temperature of the first heating element 120 can be 80℃~120℃. This temperature only serves to preheat, reduce the viscosity of the liquid matrix, improve its fluidity, and prevent dry burning. The heating temperature of the second heating element 130 can be 220℃~280℃. This temperature is used to heat the liquid matrix into aerosol, ensuring the amount of mist output and conversion efficiency.

[0092] This application also provides a liquid heating device 200 and a liquid heating system 300. Figure 5 This is a schematic diagram of the structure of a liquid heating system provided in an embodiment of this application, as shown below. Figure 5 As shown, the liquid heating system 300 includes a power supply component 310 and a liquid heating device 200.

[0093] The liquid heating device 200 includes a liquid storage assembly 210 and any of the aforementioned heating elements 100. The heating element 100 is located in the liquid storage assembly 210. The power supply assembly 310 is used to supply power to the heating element 100.

[0094] The liquid storage assembly 210 is used to store the liquid matrix and supply it to the heating core 100. After the heating core 100 is disposed in the liquid storage assembly 210, the liquid matrix in the liquid storage assembly 210 can enter the substrate 110 from the first surface 111 side.

[0095] During the operation of the liquid heating device 200, the first heating element 120 can preheat the liquid matrix entering the substrate 110, thereby increasing the temperature and decreasing the viscosity of the liquid matrix, thus improving the ability of the liquid matrix to be transported along the first direction X to the second surface 112. Subsequently, the second heating element 130 can heat the liquid matrix reaching the second surface 112, causing the liquid matrix to be converted into a vapor.

[0096] The above settings can reduce the possibility of liquid supply interruption due to insufficient fluidity of high-viscosity liquid matrix and improve the stability of the liquid heating device 200.

[0097] In some examples, the power supply component 310 may include a battery, a circuit board, and power supply electrodes. The battery is connected to the circuit board, the power supply electrodes are connected to the circuit board, and the power supply electrodes are electrically connected to the liquid heating device 200. Exemplarily, the battery may include any one of a lithium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, or a lithium-based battery, and the lithium-based battery may include a lithium cobalt battery, a lithium iron phosphate battery, a lithium titanate battery, or a lithium polymer battery.

[0098] After the liquid heating device 200 is connected to the power supply component 310, the power supply component 310 can provide electrical energy to the first heating element 120 and the second heating element 130 through the first electrical connection part 140 and the second electrical connection part 150.

[0099] The first heating element 120 generates heat after being energized, which preheats the liquid matrix inside the substrate 110; the second heating element 130 generates heat after being energized, which heats the liquid matrix at the second surface 112.

[0100] In some examples, the power supply component 310 can control the first heating element 120 and the second heating element 130 to work simultaneously.

[0101] In other examples, the power supply component 310 can control the first heating element 120 to operate before the second heating element 130, so that the first heating element 120 preheats the liquid matrix first, and then the second heating element 130 heats it. With the above settings, the operating mode of the first heating element 120 and the second heating element 130 can be adjusted according to factors such as the viscosity of the liquid matrix.

[0102] In the heating core 100 provided in this application embodiment, by providing a substrate 110 having a first surface 111 and a second surface 112, and by reducing the porosity of the substrate 110 along the first direction X from the first surface 111 to the second surface 112, the side of the substrate 110 near the first surface 111 has better liquid absorption capacity, and the side of the substrate 110 near the second surface 112 has better liquid locking capacity.

[0103] By embedding the first heating element 120 into the substrate 110 and placing the second heating element 130 on the second surface 112, the first heating element 120 can preheat the liquid matrix during the conveying process, reduce the viscosity of the liquid matrix, and improve the ability of the liquid matrix to be conveyed towards the second heating element 130. At the same time, the second heating element 130 can heat the liquid matrix that seeps out to the second surface 112.

[0104] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A heating element, characterized in that, The device includes a substrate (110), a first heating element (120), and a second heating element (130). The substrate (110) has a first surface (111) and a second surface (112) opposite each other in a first direction (X). The porosity of the substrate (110) decreases along the first direction (X) from the first surface (111) to the second surface (112). The second heating element (130) is disposed on the second surface (112). The first heating element (120) is embedded in the substrate (110) and located between the first surface (111) and the second surface (112).

2. The heating element according to claim 1, characterized in that, The porosity of the matrix (110) varies continuously or in a layered gradient along the first direction (X).

3. The heating element according to claim 1, characterized in that, The first heating element (120) and the second heating element (130) are arranged in parallel.

4. The heating element according to claim 3, characterized in that, The heating element further includes a first electrical connection portion (140) and a second electrical connection portion (150), which are respectively embedded in the substrate (110). The length directions of the first electrical connection portion (140) and the second electrical connection portion (150) are respectively along the first direction (X). One pole of the first heating element (120) and one pole of the second heating element (130) are electrically connected to the first electrical connection part (140), and the other pole of the first heating element (120) and the other pole of the second heating element (130) are electrically connected to the second electrical connection part (150).

5. The heating element according to claim 1, characterized in that, The first heating element (120) is provided in multiple ways, and the multiple first heating elements (120) are arranged sequentially at intervals along the first direction (X).

6. The heating element according to claim 5, characterized in that, Along the first direction (X) from the first surface (111) to the second surface (112), the resistance of the plurality of first heating elements (120) decreases one by one.

7. The heating element according to any one of claims 1 to 6, characterized in that, The substrate (110) includes a plurality of sub-substrates (160), which are stacked sequentially along the first direction (X).

8. The heating element according to claim 7, characterized in that, The first heating element (120) is located between two adjacent sub-sub ...

9. The heating element according to claim 7, characterized in that, The plurality of sub-substrates (160) include a first sub-substrate (161), a second sub-substrate (162) and a third sub-substrate (163) stacked sequentially along the first direction (X), and the second heating element (130) is disposed on the side of the third sub-substrate (163) away from the second sub-substrate (162); The porosity of the first sub-matrix (161) is 60% to 70%, the porosity of the second sub-matrix (162) is 50% to 60%, and the porosity of the third sub-matrix (163) is 40% to 50%.

10. A liquid heating device, characterized in that, It includes a liquid storage assembly (210) and a heating element (100) as claimed in any one of claims 1 to 9, wherein the heating element (100) is located in the liquid storage assembly (210).

11. A liquid heating system, characterized in that, It includes a power supply component (310) and a liquid heating device (200) as claimed in claim 10, wherein the power supply component (310) is used to supply power to the heating core (100).

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