CN115886569A - Heating element assembly and preparation method and application thereof - Google Patents

Heating element assembly and preparation method and application thereof Download PDF

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Publication number
CN115886569A
CN115886569A CN202111161366.3A CN202111161366A CN115886569A CN 115886569 A CN115886569 A CN 115886569A CN 202111161366 A CN202111161366 A CN 202111161366A CN 115886569 A CN115886569 A CN 115886569A
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China
Prior art keywords
layer
inorganic layer
heat
heating
inorganic
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李兴航
曹达华
王婷
万鹏
周瑜杰
梅长云
刘志才
马向阳
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Priority to CN202111161366.3A priority Critical patent/CN115886569A/en
Publication of CN115886569A publication Critical patent/CN115886569A/en
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Abstract

The invention discloses a heating element assembly and a preparation method and application thereof, wherein the heating element assembly comprises: the heating layer is heated to generate heat, and the speed of the heat transferred to the first inorganic layer is different from the speed of the heat transferred to the second inorganic layer. The heat generated by the heating layer of the heating body assembly under the action of the alternating magnetic field is transferred through the first inorganic layer and the second inorganic layer at different speeds, so that the advantageous heat transfer direction is generated, and the heat is transferred to the inorganic layer with high transfer speed more easily. Simultaneously, this heat-generating body subassembly has still reduced the noise that produces when heating the material.

Description

Heating element assembly and preparation method and application thereof
Technical Field
The invention belongs to the technical field of cooking appliances, and particularly relates to a heating element assembly and a preparation method and application thereof.
Background
The cooking utensil is applied to a plurality of inorganic materials such as ceramics, glass and the like, such as a ceramic inner container in an electric stewpot, a glass material inner container adopted by a glass health preserving pot, a microcrystal pot used by an induction cooker and the like, a ceramic pot and the like. The glass ceramic and other materials have very good chemical stability, and the materials are healthy and environment-friendly. However, these inorganic materials also have many disadvantages, such as low heat transfer efficiency, poor toughness and brittleness.
Aiming at a glass heating vessel, the conventional application scheme is mainly that heating components such as a heating pipe and a heating plate are adopted, the glass vessel is in contact heat transfer with the heating pipe of the heating plate, and the scheme is characterized in that the whole component is simple, but the scheme has the larger problems that the contact area is small, the contact is difficult, the heat transfer efficiency is too low, the heating time of 1L water applied to a kettle and the like exceeds 15min, the heat efficiency in the prior art is improved, and the benefit is smaller.
In the prior art, a scheme of thick film heating is adopted, namely a thick film circuit is printed on a glass plate for heating, the scheme is high in heat efficiency and uniform in heating, but the requirement on glass is high, if temperature-resistant quartz glass and the like are adopted, the safety problem also exists, the current is large under the condition that the glass is broken, and great hidden danger is formed on the safety of consumers.
In addition, in the prior art, a scheme of arranging the metal magnetic conduction film on the outer side of the glass plate by printing or hot transfer is adopted, and heating is carried out in an electromagnetic heating mode.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a heating element assembly, a method for manufacturing the same, and an application thereof, in which the heat generated by a heating layer of the heating element assembly under the action of an alternating magnetic field is transferred at different speeds through a first inorganic layer and a second inorganic layer, thereby generating an advantageous direction of heat transfer, and the heat is more easily transferred to the inorganic layer having a high transfer speed. Simultaneously, this heat-generating body subassembly has still reduced the noise that produces when heating the material.
In one aspect of the present invention, a heat generator assembly is provided. According to an embodiment of the present invention, the heat-generating body assembly includes: the heating layer is heated to generate heat, and the speed of the heat transferred to the first inorganic layer is different from the speed of the heat transferred to the second inorganic layer.
According to the heating body assembly provided by the embodiment of the invention, the heat generated by the heating layer under the action of the alternating magnetic field is transferred through the first inorganic layer and the second inorganic layer at different speeds, so that an advantageous heat transfer direction is generated, and the heat is more easily transferred to the inorganic layer with a high transfer speed. Meanwhile, the heating element assembly of the invention also reduces the noise generated when heating materials, particularly, if a single inorganic layer is arranged on one side of the heating layer, when the heating layer generates heat, the heat is transferred in the direction without the inorganic layer at a higher speed, so the generated noise is higher.
In addition, the heat generator module according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the heat is transferred to the first inorganic layer at a greater rate than to the second inorganic layer.
In some embodiments of the present invention, the thickness of the second inorganic layer is not less than the thickness of the first inorganic layer.
In some embodiments of the present invention, the difference in thickness of the second inorganic layer and the first inorganic layer is no greater than 4.5mm.
In some embodiments of the present invention, the difference in thickness of the second inorganic layer and the first inorganic layer is 0.5 to 3mm.
In some embodiments of the present invention, a thickness ratio of the second inorganic layer to the first inorganic layer is greater than 1 and equal to or less than 15.
In some embodiments of the present invention, a thickness ratio of the second inorganic layer to the first inorganic layer is greater than 1 and equal to or less than 10.
In some embodiments of the present invention, the thickness of the second inorganic layer is not less than 2mm, and the thickness of the first inorganic layer is not greater than 2mm.
In some embodiments of the present invention, the first inorganic layer has a thickness of 0.3 to 2mm and the second inorganic layer has a thickness of 2 to 4mm.
In some embodiments of the invention, at least one of the following conditions is met: the thickness of the heating layer is 10-25 μm; the heating layer includes a weakly magnetic metal material and a glass phase.
In some embodiments of the invention, at least one of the following conditions is satisfied: the content of the weak magnetic metal material in the heating layer is 70-90wt%; the weakly magnetic metal material is selected from at least one of silver, aluminum and copper; the material of the glass phase comprises SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a).
In some embodiments of the invention, the first inorganic layer is connected to the heating layer through a first bonding glaze layer, and the second inorganic layer is connected to the heating layer through a second bonding glaze layer; or the first inorganic layer is connected with the heating layer through a first bonding glaze layer, and the second inorganic layer is directly connected with the heating layer; or the second inorganic layer is connected with the heating layer through a second bonding glaze layer, and the first inorganic layer is directly connected with the heating layer; or the first inorganic layer and the second inorganic layer are respectively directly connected with the heating layer.
In some embodiments of the invention, the thickness of the first and second bonding glaze layers is each independently greater than the thickness of the heating layer.
In some embodiments of the invention, the first and second bonding glaze layers each independently have a thickness of 5-30 μm.
In some embodiments of the invention, the first and/or second bonding glaze layer is at least partially embedded in the heating layer.
In some embodiments of the invention, the glaze in the first and second bonding glaze layers each independently comprises SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a).
In some embodiments of the present invention, the heating layer is directly connected to the first inorganic layer and/or the second inorganic layer, the weakly magnetic metal material in the heating layer is disposed away from the first inorganic layer and/or the second inorganic layer, and the glass in the heating layer is disposed proximate to the first inorganic layer and/or the second inorganic layer.
In some embodiments of the invention, the heating layer is connected to the first inorganic layer and/or the second inorganic layer by a relief structure, the relief structure being formed by at least partial embedding of the glassy phase in the heating layer in the first inorganic layer and/or the second inorganic layer.
In some embodiments of the present invention, the heating layer includes a heat generating layer and a transition connection layer, the heat generating layer is connected to the first inorganic layer and/or the second inorganic layer through the transition connection layer, the heat generating layer includes a weak magnetic metal material and a glass phase, the transition connection layer includes a glass phase, and the glass phase in the heat generating layer is connected to the glass in the transition connection layer.
In some embodiments of the invention, at least one of the following conditions is met: the components of the glass phase in the transition connection layer are the same as those of the glass phase in the heating layer; the transition connection layer does not contain a weak magnetic metal material; the thickness of the transition connecting layer is 0.1-5 microns.
In some embodiments of the invention, the weakly magnetic metal material in the heat generating layer is at least partially embedded in the transition connection layer.
In some embodiments of the invention, the first inorganic layer and the second inorganic layer are each independently a glass layer or a ceramic layer.
In still another aspect of the present invention, the present invention provides a method of producing the above heat-generating body assembly. According to an embodiment of the invention, the method comprises:
(1) Providing a first inorganic layer and a second inorganic layer;
(2) A heating layer is formed between the first inorganic layer and the second inorganic layer so as to obtain a heat-generating body assembly.
According to the method of manufacturing the above heat-generating body assembly of the embodiment of the invention, by providing the heating layer between the first inorganic layer and the second inorganic layer, the speed of heat generated by the heating layer under the action of the alternating magnetic field being transferred through the first inorganic layer and the second inorganic layer is different, thereby producing an advantageous direction of heat transfer, and the heat is more easily transferred to the inorganic layer having a high transfer speed. Meanwhile, the heating element assembly of the invention also reduces the noise generated when heating materials, particularly, if a single inorganic layer is arranged on one side of the heating layer, when the heating layer generates heat, the heat is transferred in the direction without the inorganic layer at a higher speed, so the generated noise is higher.
In addition, the method of manufacturing a heat-generating body assembly according to the above embodiment of the invention may further have the following additional technical features:
in some embodiments of the present invention, the step of forming a heating layer between the first inorganic layer and the second inorganic layer so as to obtain a heat generator assembly further comprises: forming a first bonding glaze layer on one side, close to the heating layer, of the first inorganic layer; and/or forming a second bonding glaze layer on one side of the second inorganic layer close to the heating layer.
In a third aspect of the invention, a heatable appliance is presented. According to an embodiment of the present invention, the heatable appliance comprises the heat generator assembly described in the above embodiment or the heat generator assembly manufactured by the method described in the above embodiment, and the first inorganic layer is at least a part of the container constituting the heatable appliance. Therefore, the first inorganic layer with higher heat transfer speed forms at least one part of the cavity of the heatable appliance, and the heat generated by the heat generating layer is transferred to the first inorganic layer at a speed higher than that of the second inorganic layer, so that the heat is more easily transferred to the direction of the first inorganic layer, namely the heat is more easily transferred to the direction of the cavity of the heatable appliance, and the heatable appliance has higher heat transfer efficiency; meanwhile, the noise generated when the heatable appliance is used for heating materials is small.
In addition, the heatable appliance according to the above-described embodiment of the present invention may also have the following additional technical features:
in some embodiments of the invention, the heater assembly is disposed at the bottom of the heatable appliance;
and/or negative pressure air is arranged between the heating layer and the edges of the first inorganic layer and the second inorganic layer.
In some embodiments of the invention, the heatable utensil includes a side wall and a bottom wall that are sealingly connected, at least a portion of the bottom wall being the heat-generating body assembly;
and/or the heating element assembly is connected with the side wall through welding or bonding agent.
In a fourth aspect of the invention, a cooking appliance is presented. According to an embodiment of the present invention, the cooking appliance has the heatable appliance described in the above embodiment. Therefore, the cooking utensil is high in heat transfer efficiency, and meanwhile, the cooking utensil generates small noise when heating materials, so that the requirements of consumers are further met, and the user experience is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view showing a structure of a heat-generating body assembly according to an embodiment of the present invention.
FIG. 2 is a schematic view showing a structure of a heat-generating body assembly according to still another embodiment of the present invention.
FIG. 3 is a schematic view showing a structure of a heat generating body assembly of still another embodiment of the present invention.
FIG. 4 is a schematic view showing a structure of a heat generating body assembly of still another embodiment of the present invention.
FIG. 5 is a partially enlarged view of a heat-generating body assembly of still another embodiment of the invention.
FIG. 6 is a schematic view showing a structure of an electric kettle having a heat generating body assembly according to an embodiment of the present invention.
FIG. 7 is a schematic view showing a structure of an electric kettle having a heater assembly according to still another embodiment of the present invention.
Fig. 8 is a schematic structural view of a pot having a heat-generating body assembly according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In one aspect of the present invention, a heat generating body assembly 100 is proposed. According to an embodiment of the present invention, referring to fig. 1, the above-described heat-generating body assembly 100 includes a first inorganic layer 1 and a second inorganic layer 2, a heating layer 3 is provided between the first inorganic layer 1 and the second inorganic layer 2, heat generated by heating the heating layer is transferred through the first inorganic layer and the second inorganic layer, and the heat is transferred to the first inorganic layer at a speed different from that of the second inorganic layer. Therefore, the heat generated by the heating layer under the action of the alternating magnetic field is transferred through the first inorganic layer and the second inorganic layer at different speeds, so that an advantageous heat transfer direction is generated, and the heat is more easily transferred to the inorganic layer with a high transfer speed; meanwhile, the heating element assembly of the invention also reduces the noise generated when heating materials, particularly, if a single inorganic layer is arranged on one side of the heating layer, when the heating layer generates heat, the heat is transferred in the direction without the inorganic layer at a higher speed, so the generated noise is higher.
According to a specific embodiment of the invention, said heat is transferred to said first inorganic layer at a higher rate than to said second inorganic layer, thereby creating an advantageous direction of heat transfer, and the heat generated by the heating layer is transferred more easily in the direction of the first inorganic layer.
According to another specific embodiment of the present invention, the thickness of the second inorganic layer is not less than the thickness of the first inorganic layer, so that, under the same condition, the heat transfer efficiency of the first inorganic layer is not less than the heat transfer efficiency of the second inorganic layer, and further the heat generated by the heating layer is promoted to transfer to the first inorganic layer at a speed higher than the speed of transferring to the second inorganic layer, thereby generating an advantageous heat transfer direction in which the heat generated by the heating layer is more easily transferred to the first inorganic layer.
According to still another embodiment of the present invention, the difference between the thicknesses of the second inorganic layer 2 and the first inorganic layer 1 is not more than 4.5mm, and more preferably, the difference between the thicknesses of the second inorganic layer 2 and the first inorganic layer 1 is 0.5 to 3mm. From this, both further guaranteed that the heat is easier to the direction transmission in which less first inorganic layer 1 of thickness is located, most heat all transmits to first inorganic layer 1, and then the material of heating with first inorganic layer 1 contact, thereby realized the purpose that heat transfer efficiency is high, the inorganic layer of second that has still avoided the too big and cause of difference of second inorganic layer and first inorganic layer thickness simultaneously breaks easily, the noise that the subassembly that generates heat produced when heating the material is great and the poor easy scheduling problem that breaks of mechanical strength on first inorganic layer. The inventors have found that if the difference between the thickness of the second inorganic layer and the first inorganic layer is too large, it may cause: firstly, the thickness of the second inorganic layer is indirectly too large, so that the thermal resistance of the second inorganic layer is too large, heat generated by the heating layer is difficult to transfer from the second inorganic layer, a large amount of heat is accumulated in the second inorganic layer, and the excessive heat easily generates thermal stress in the second inorganic layer, so that the risk of the second inorganic layer cracking is increased; secondly, on the premise that the thickness difference between the second inorganic layer and the first inorganic layer is constant, in order to ensure that the thickness of the second inorganic layer cannot be too high, the thickness of the first inorganic layer must be greatly reduced, so that the thickness of the first inorganic layer is too thin, the mechanical strength of the first inorganic layer is reduced, the preparation difficulty is increased, and the efficiency of heat transfer to the first inorganic layer is increased due to the too thin thickness of the first inorganic layer, so that the noise generated by the heating component when materials are heated is increased; third, if the thickness of the first inorganic layer is different from that of the second inorganic layer by a large amount, the rate of heat transfer to the first inorganic layer is further increased, which causes a large noise generated when the heating element heats the material, and in addition, increases the risk of cracking of the thin first inorganic layer.
According to another embodiment of the present invention, the ratio of the thicknesses of the second inorganic layer and the first inorganic layer is greater than 1 and less than or equal to 15, and preferably greater than 1 and less than or equal to 10, thereby further ensuring that heat is more easily transferred to the direction of the first inorganic layer 1 with smaller thickness, most of the heat is transferred to the first inorganic layer 1, and then the material in contact with the first inorganic layer 1 is heated, thereby achieving the purpose of high heat transfer efficiency, and simultaneously avoiding the problems that the second inorganic layer is easily broken, the noise generated by the heating element when heating the material is large, and the mechanical strength of the first inorganic layer is poor and the like due to the excessively large ratio of the thicknesses of the second inorganic layer and the first inorganic layer. The inventors have found that if the ratio of the thickness of the second inorganic layer to the first inorganic layer is too large, this results in: firstly, the thickness of the second inorganic layer is indirectly caused to be too large, so that the thermal resistance of the second inorganic layer is caused to be too large, heat generated by the heating layer is difficult to be transferred from the second inorganic layer, a large amount of heat is accumulated in the second inorganic layer, and the excessive heat is easy to generate thermal stress in the second inorganic layer, so that the risk of the second inorganic layer cracking is increased; secondly, on the premise that the thickness ratio of the second inorganic layer to the first inorganic layer is constant, in order to ensure that the thickness of the second inorganic layer cannot be too high, the thickness of the first inorganic layer must be greatly reduced, so that the thickness of the first inorganic layer is too thin, the mechanical strength of the first inorganic layer is reduced, the preparation difficulty is increased, and the efficiency of heat transfer to the first inorganic layer is increased due to the too thin thickness of the first inorganic layer, so that the noise generated by the heating component when materials are heated is increased; third, if the ratio of the thicknesses of the first inorganic layer and the second inorganic layer is large, the rate of heat transfer to the first inorganic layer is further increased, thereby causing a large noise generated when the heating element heats a material, and additionally increasing the risk of cracking of the thin first inorganic layer.
According to another embodiment of the present invention, the thickness of the second inorganic layer is not less than 2mm, and the thickness of the first inorganic layer is not more than 2mm, thereby further ensuring that heat is easier to be transferred to the direction of the first inorganic layer 1 with smaller thickness, and most of the heat is transferred to the first inorganic layer 1, and further heating the material in contact with the first inorganic layer 1, thereby achieving the purposes of high heat transfer efficiency and noise reduction. The inventor finds that, because the heat transfer rate in the first inorganic layer is high, if the thickness of the first inorganic layer is greater than 2mm, on one hand, the thermal stress in the first inorganic layer is excessive, and the probability of the first inorganic layer being broken is greatly increased under the condition that the first inorganic layer is broken and microcracks exist, and on the other hand, the heat transfer rate on the first inorganic layer side can be reduced, so that the advantageous heat transfer tendency is reduced; if the thickness of the second inorganic layer is less than 2mm, on one hand, the mechanical strength of the second inorganic layer is reduced, and problems such as collision and fracture are easy to occur, on the other hand, the rate of heat transfer on the side of the second inorganic layer can be increased, so that the preferential heat transfer tendency is reduced, and meanwhile, as the rate of heat transfer from the second inorganic layer to the outside is slower, but the rate of heat transfer from the heating layer to the second inorganic layer is faster, and the second inorganic layer is in contact with air, heat is easy to accumulate in the second inorganic layer, so that the risk of fracture is increased.
According to another embodiment of the present invention, the thickness of the first inorganic layer 1 is 0.3-2mm, and the thickness of the second inorganic layer 2 is 2-4mm, so that, firstly, the thickness range provides a suitable thickness difference between the second inorganic layer and the first inorganic layer, and further ensures that the heat generated by the heating layer is transferred to the first inorganic layer at a speed higher than the speed of the heat generated by the second inorganic layer, thereby generating an advantageous heat transfer direction, and facilitating the heat generated by the heating layer to be transferred to the direction of the first inorganic layer; secondly, the thickness of the first inorganic layer is ensured to be in a proper range, and the risks of strength reduction and unobvious noise reduction effect of the first inorganic layer caused by over-small thickness of the first inorganic layer are avoided; thirdly, the thickness of the second inorganic layer is ensured to be in a proper range, and the risk that the second inorganic layer is cracked due to overhigh internal stress in the second inorganic layer because the heat transfer efficiency of the second inorganic layer is low due to overlarge thickness of the second inorganic layer is avoided; fourthly, the thickness of the first inorganic layer is matched with that of the second inorganic layer, so that the thickness difference or the thickness ratio between the first inorganic layer and the second inorganic layer is not too high or too low, the overall mechanical performance, the heat transfer efficiency and the noise reduction effect of the heating element assembly are improved, the bearing capacity of welding stress during welding of the subsequent heating element assembly and the container body is improved, and the overall mechanical performance of the heating element assembly is ensured.
According to another embodiment of the present invention, the heating layer 3 includes a weakly magnetic metal material and a glass phase, the heating layer is formed by heating and sintering a slurry including the weakly magnetic metal material and an inorganic frit, and the inorganic frit forms the glass phase after sintering. The weak magnetic metal material has the effect that the weak magnetic metal material generates eddy current under the action of an alternating magnetic field, so that heat is generated; it can be understood that the weak magnetic metal material in the heating layer generates heat under the action of the alternating magnetic field, and is easy to generate a phenomenon of heat concentration in the heating layer, if a glass phase is not arranged to directly transfer the heat to the first inorganic layer or the second inorganic layer, hot spots are easy to generate in the first inorganic layer or the second inorganic layer to form thermal stress due to poor thermal conductivity of the first inorganic layer or the second inorganic layer, and excessive thermal stress is easy to cause the risk of cracking of the first inorganic layer or the second inorganic layer.
According to still another embodiment of the present invention, the ratio of the weak magnetic metal material in the heating layer 3 is 70 to 90% by mass, and thus the weight content of the weak magnetic metal material in the heating layer 3 is limited to the above range, which further enables the heating layer 3 to achieve the purpose of high heat generation efficiency, and simultaneously, the heat generated by the weak magnetic metal material is uniformly transferred to the first inorganic layer or the second inorganic layer through the glass phase having an appropriate content, thereby preventing the heat from forming a hot spot in the first inorganic layer or the second inorganic layer, further enabling the heat to be uniformly dispersed and transferred, and simultaneously, preventing the thermal stress formed in the inorganic layer due to the hot spot, and improving the bonding force between the heat generating layer and the inorganic layer, thereby improving the mechanical strength of the entire heating element assembly.
In the embodiment of the present invention, the specific kind of the weak magnetic metal material is not particularly limited, and may be arbitrarily selected by those skilled in the art according to actual needs, and as a preferable mode, the weak magnetic resistant metal material is selected from at least one of silver, aluminum and copper, and thus the heating layer 3 formed of the material has high heat generation efficiency.
In the embodiment of the present invention, the glass phase is sintered by an inorganic glaze, the specific kind of the inorganic glaze is not particularly limited, and one skilled in the art can optionally select the inorganic glaze according to actual needs, and as a preferable scheme, the inorganic glaze is selected from SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a). Therefore, the glass phase formed by the materials can provide proper thermal resistance between the weak magnetic metal material and the inorganic layer (the first inorganic layer or the second inorganic layer), and hot spots formed by heat in the first inorganic layer or the second inorganic layer are avoided, so that the heat can be uniformly dispersed and transferred.
According to still another embodiment of the present invention, the thickness of the above heating layer 3 is in the range of 10 to 25 μm, whereby the heating layer 3 in this thickness range has a high heat generation efficiency.
According to still another embodiment of the present invention, the heating layer is directly connected to the first inorganic layer and/or the second inorganic layer, the weakly magnetic metal material in the heating layer is disposed away from the first inorganic layer and/or the second inorganic layer, and the glass phase in the heating layer is disposed close to the first inorganic layer and/or the second inorganic layer, whereby the risk of the weakly magnetic metal material being in direct contact with the inorganic layer is further reduced by disposing the weakly magnetic metal material away from the inorganic layer (i.e., the first inorganic layer and/or the second inorganic layer), so that the heat generated by the heat generation of the weakly magnetic metal material is not directly transferred to the inorganic layer but transferred to the inorganic layer through the glass phase, thereby increasing the thermal resistance of the heat transfer, while the heat transfer rate of the glass phase is low, thereby increasing the uniformity of the heat transfer, avoiding the formation of hot spots in the inorganic layer, increasing the bonding force between the heat generation layer and the inorganic layer, and thereby increasing the mechanical strength of the entire heat generation body assembly.
According to another specific embodiment of the present invention, the heating layer is connected with the first inorganic layer and/or the second inorganic layer through a concave-convex structure, and the glass phase in the heating layer is embedded in the first inorganic layer and/or the second inorganic layer matrix to form the concave-convex structure, so that, on one hand, by providing the concave-convex structure, the contact area between the heating layer and the inorganic layer (i.e. the first inorganic layer and/or the second inorganic layer) is increased, i.e. the area of heat transfer is increased, thereby improving the uniformity of heat transfer, avoiding the formation of hot spots in the inorganic layer, thereby reducing the risk of inorganic layer cracking, and simultaneously improving the bonding force between the heating layer and the inorganic layer; on the other hand, the glass phase in the heating layer is embedded into the inorganic layer matrix, so that the risk of direct contact between the weak magnetic metal material and the inorganic layer is further reduced, heat generated by heating of the weak magnetic metal material is not directly transferred to the inorganic layer but transferred to the inorganic layer through the glass phase, the heat resistance of heat transfer is increased, the heat conduction rate of the glass phase is low, the uniformity of heat transfer is increased, the formation of hot spots in the inorganic layer is avoided, the risk of inorganic layer breakage is reduced, and the bonding force between the heating layer and the inorganic layer is improved.
According to another specific embodiment of the present invention, the heating layer includes a heating layer and a transition connection layer, the heating layer is connected to the first inorganic layer and/or the second inorganic layer through the transition connection layer, the heating layer includes a weakly magnetic metal material and a glass phase, the transition connection layer includes a glass phase, and the glass phase in the heating layer is connected to the glass phase in the transition connection layer, so that, firstly, by setting the heating layer to include the weakly magnetic metal material and the glass phase, the distribution of the weakly magnetic metal material in the heating layer is more uniform, so that the heat generated by the weakly magnetic metal material is not concentrated in a large amount, the generated heat is more uniform, thereby reducing the formation of hot spots in the heating layer and the inorganic layer, reducing the risk of cracking of the inorganic layer, improving the service life of the inorganic layer, and simultaneously improving the bonding strength between the inorganic layer and the heating layer; secondly, the transition connection layer comprises a glass phase, and because interface thermal resistance exists between the transition connection layer and the interface of the first inorganic layer, the transmission rate of heat generated by the weak magnetic metal material to the first inorganic layer is further reduced, and the noise generated by the heating component when the material is heated is reduced; thirdly, the glass phase in the transition connecting layer and the glass phase in the heating layer are mutually connected, so that the thermal resistance between the heating layer and the transition connecting layer is reduced, the risk of generating micro cracks in the heating layer is reduced, the uniform dispersion of heat in the transition connecting layer can be promoted, the formation of hot spots in the heating layer is reduced, and meanwhile, the binding force between the transition connecting layer and the heating layer is also improved.
According to another embodiment of the invention, the composition of the glass phase in the transition connection layer is the same as that of the glass phase in the heat-generating layer, and therefore, the interconnection of the two glass phases with the same composition further reduces the thermal resistance between the heat-generating layer and the transition connection layer, further reduces the risk of micro-cracks generated inside the heat-generating layer, can promote the uniform dispersion of heat in the transition connection layer, further reduces the formation of hot spots in the heat-generating layer, and further improves the bonding force between the transition connection layer and the heat-generating layer.
According to another embodiment of the present invention, the transition connection layer does not contain a weak magnetic metal material, thereby further promoting the formation of the thermal resistance of the portion, and preventing the weak magnetic metal material from directly contacting the inorganic layer, so that the heat generated by the heat generation of the weak magnetic metal material is not directly transferred to the inorganic layer, but is transferred to the inorganic layer through the transition connection layer, thereby increasing the thermal resistance of heat transfer, increasing the uniformity of heat transfer, preventing the formation of hot spots in the heating layer and the inorganic layer, improving the bonding force between the heating layer and the inorganic layer, and reducing noise.
According to another embodiment of the present invention, the thickness of the transition connection layer is 0.1 to 5 μm, thereby limiting the thickness of the transition connection layer within the above range, further promoting the formation of the partial thermal resistance, preventing the weak magnetic metal material from directly contacting the inorganic layer, preventing the formation of hot spots in the heating layer and the inorganic layer, improving the bonding force between the heating layer and the inorganic layer, and also reducing noise, and if the thickness of the transition connection layer is too large, the efficiency of heat transfer may be reduced.
According to another specific embodiment of the present invention, the weak magnetic metal material in the heat generating layer is embedded in the transition connection layer, so that the contact area between the weak magnetic metal material and the transition connection layer is further increased, the heat transfer area is increased, the uniformity of heat transfer is increased, the formation of hot spots in the heating layer is avoided, and the risk of generating micro cracks inside the heating layer is further reduced.
According to another embodiment of the present invention, referring to fig. 2, the first inorganic layer 1 is connected to one side of the heating layer 3 through a first bonding glaze layer 4, and the other side of the heating layer 3 is directly connected to the second inorganic layer 2, so that by disposing the first bonding glaze layer between the first inorganic layer and the heating layer, thermal resistance between the heating layer and the first inorganic layer is increased, hot spots formed in the first inorganic layer by heat are reduced, heat can be uniformly dispersed and transferred, thermal stress formed in the first inorganic layer due to the hot spots is avoided, the risk of cracking of the first inorganic layer is reduced, noise is reduced, and the bonding force between the heating layer and the first inorganic layer is also increased.
According to another embodiment of the present invention, referring to fig. 3 and 5, the second inorganic layer 2 is connected to one side of the heating layer 3 through the second adhesive glaze layer 5, and the other side of the heating layer 3 is directly connected to the first inorganic layer 1, so that the first inorganic layer with a smaller thickness is directly connected to the heating layer, thereby promoting the heat transfer to the first inorganic layer and further promoting the advantageous heat conduction direction; the second inorganic layer with larger thickness is connected with the heating layer through the bonding glaze layer, on one hand, the thermal resistance between the heating layer and the second inorganic layer is improved, the heat is further promoted to be transferred to the first inorganic layer, on the other hand, the efficiency of transferring the heat to the second inorganic layer is also reduced, the heat loss is reduced, hot spots formed in the second inorganic layer by the heat are also reduced, so that the heat can be uniformly and dispersedly transferred, the thermal stress formed in the second inorganic layer due to the accumulation of the hot spots is reduced, the risk of the second inorganic layer cracking is reduced, meanwhile, the bonding force between the heating layer and the second inorganic layer is also improved, and the integral mechanical strength of the heating body assembly is improved.
According to another embodiment of the present invention, referring to fig. 4, the first inorganic layer 1 is connected to one side of the heating layer 3 through a first bonding glaze layer 4, and the second inorganic layer 2 is connected to the other side of the heating layer 3 through a second bonding glaze layer 5, so that by disposing the first bonding glaze layer between the first inorganic layer and the heating layer, the thermal resistance between the heating layer and the first inorganic layer is increased, hot spots formed in the first inorganic layer by heat are reduced, heat stress formed in the first inorganic layer due to the hot spots is prevented from being generated, the risk of cracking of the first inorganic layer is reduced, noise is reduced, and the bonding force between the heat generating layer and the first inorganic layer is also increased; through set up the second glaze layer that bonds between inorganic layer of second and zone of heating, on the one hand, the thermal resistance between zone of heating and the inorganic layer of second has been improved, further promote the heat to first inorganic layer transmission, on the other hand, the efficiency of heat to the inorganic layer transmission of second has still been reduced, heat scattering and disappearing has been reduced, and heat has still been reduced and has formed the focus in the inorganic layer of second, thereby make the dispersion transmission that the heat can be more even, heat stress in the inorganic layer of second has been reduced because the focus is piled up, the risk that the inorganic layer of second takes place to break has been reduced, the cohesion between the layer of generating heat and the inorganic layer of second has still been improved simultaneously, thereby the holistic mechanical strength of heating body subassembly has been improved.
According to a further specific embodiment of the present invention, the glaze of the first bonding glaze layer and/or the second bonding glaze layer is embedded in the heating layer, thereby increasing the contact area between the bonding glaze layer (i.e., the first bonding glaze layer and/or the second bonding glaze layer) and the heating layer, increasing the uniformity of heat dispersion in the bonding glaze layer, and thus reducing the formation of hot spots in the bonding glaze layer, and thus reducing the formation of micro-cracks between the bonding glaze layer and the heating layer, and also increasing the bonding force between the bonding glaze layer and the heating layer.
According to still another embodiment of the present invention, the thickness of the first glaze layer 4 is 5 to 30 μm, and thus, by limiting the thickness of the first glaze layer 4 to the above range, it is possible to further reduce the risk of cracking of the first inorganic layer, reduce noise, improve the bonding force between the heat generating layer and the first inorganic layer, and prevent the thermal resistance of the first glaze layer 4 from being too large due to the excessive thickness of the first glaze layer 4, thereby reducing the advantageous heat transfer direction.
In the embodiment of the present invention, the material of the first bonding glaze layer 4 is not particularly limited, and may be arbitrarily selected by those skilled in the art according to practical circumstances, and as a preferable mode, the material of the first bonding glaze layer includes one selected from SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a).
According to still another embodiment of the present invention, the thickness of the second glaze layer 5 is 5 to 30 μm, and thus, by limiting the thickness of the second glaze layer 5 to the above range, it is possible to further reduce the risk of cracking of the second inorganic layer and to improve the bonding force between the heat generating layer and the second inorganic layer, and it is possible to prevent the formation of microcracks in the second glaze layer due to the accumulation of heat in the second glaze layer and the formation of thermal stress due to the formation of microcracks in the second glaze layer, which are caused by the accumulation of heat and the decrease in the heat transfer efficiency of heat in the second glaze layer, which are caused by the increase in the thickness of the second glaze layer.
In the embodiment of the present invention, the material of the second bonding glaze layer 4 is not particularly limited, and may be optionally selected by those skilled in the art according to practical circumstances, and as a preferable mode, the material of the second bonding glaze layer includes one selected from SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a).
According to another embodiment of the present invention, the first inorganic layer 1 is a glass layer or a ceramic layer, and/or the second inorganic layer 2 is a glass layer or a ceramic layer, preferably a glass layer, and the magnetic lines of force more easily pass through the glass layer to reach the heating layer 3, so that the eddy current heating effect of the heating layer 3 is not affected. In addition, the glass plate on the upper surface is directly contacted with water or food, and the risk of falling off and color change of the glass and the like can be avoided in the process of cooking the food due to the high chemical stability of the glass.
In the embodiment of the present invention, the specific type of the glass layer is not particularly limited, and those skilled in the art can optionally select the glass layer according to actual needs, and as a preferable embodiment, the glass layer is a high borosilicate glass layer, a tempered glass layer, a soda lime glass layer, an alkali-free glass layer, or a microcrystalline glass layer, so that the magnetic lines of force can more easily pass through the glass layer of the type to reach the heating layer 3, and thus the eddy current heating effect of the heating layer 3 is not affected.
In still another aspect of the present invention, the present invention provides a method of producing the above heat generating body assembly. According to an embodiment of the invention, the method comprises:
s100: a first inorganic layer and a second inorganic layer are provided.
S200: a heating layer is formed between the first inorganic layer and the second inorganic layer to obtain a heat-generating body assembly.
As a specific example, the step S200 further includes the following steps:
s210: preparing a heating layer on the first inorganic layer or the second inorganic layer, and bonding the heating layer on the first inorganic layer or the second inorganic layer.
In the embodiment of the present invention, a specific method of preparing the heating layer is not particularly limited, and may be arbitrarily selected by those skilled in the art according to actual needs, as long as the heating layer can be bonded to the first inorganic layer or the second inorganic layer. As a specific example, a specific method of preparing the heating layer is: the heating layer paste is printed on the first inorganic layer (or the second inorganic layer), dried, and then fired to bond the heating layer to the first inorganic layer (or the second inorganic layer).
In the embodiment of the present invention, the drying temperature during the process of preparing the heating layer is not particularly limited, and those skilled in the art can select the drying temperature according to actual needs, and as a preferable scheme, the drying temperature is in the range of 120 to 160 ℃. In the embodiment of the present invention, the firing temperature is not particularly limited in the process of preparing the heating layer, and those skilled in the art can select the firing temperature according to actual needs, and as a preferable scheme, the firing temperature is in the range of 550 to 650 ℃, so that the inorganic glaze material in the heating layer slurry can be ensured to form a glass phase, and the bonding strength with an inorganic layer such as a glass layer can be ensured.
According to another specific embodiment of the present invention, the heating layer paste includes a weakly magnetic metal material, an organic solvent and an inorganic glaze, the weakly magnetic metal material is used for generating eddy current under the action of an alternating magnetic field, so as to generate heat, and preferably, the weakly magnetic metal material is selected from at least one of silver, aluminum and copper; the inorganic glaze is used for forming a glass phase in the sintering process of the heating layer, and is selected from SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a). The heating layer is connected with the first inorganic layer and/or the second inorganic layer through the glass phase, so that the function of connecting the first inorganic layer and/or the second inorganic layer is realized; the organic solvent is used for uniformly dispersing the weak magnetic metal material and the inorganic glaze material in the organic solvent to form uniform and stable heating layer slurry.
In the embodiment of the present invention, the specific kind of the organic solvent is not particularly limited, and those skilled in the art may select the organic solvent at will according to actual needs, and only the weakly magnetic metal material and the inorganic glaze material are uniformly dispersed in the organic solvent to form a uniform and stable heating layer slurry.
According to another embodiment of the present invention, the organic solvent is an alcohol solvent, such as ethanol, methanol, propanol, etc., and the alcohol solvent has an advantage of being easily volatilized.
According to still another embodiment of the present invention, the solid content of the heating layer slurry is in a range of 60 to 90wt%, and thus the heating layer slurry having the solid content in the above range is prepared to have a better uniformity of the heating layer, thereby further improving the heat generation efficiency of the heating layer.
According to another specific embodiment of the embodiments of the present invention, the heating layer includes a heat generating layer and a transition connection layer, and the first inorganic layer (and/or the second inorganic layer) and the heat generating layer are bonded through the transition connection layer, and the method for preparing the heating layer includes: printing transition connection layer slurry on the first inorganic layer (and/or the second inorganic layer), drying and firing to form the transition connection layer, printing heating layer slurry on the transition connection layer, drying, and sintering at high temperature to form the heating layer. The transition connection layer slurry comprises an organic solvent and an inorganic glaze, and the inorganic glaze forms a glass phase after being sintered; meanwhile, the heat generating layer paste includes a weakly magnetic metal material, an organic solvent, and an inorganic glaze, and the inorganic glaze forms a glass phase after sintering, whereby the glass phase in the heat generating layer and the glass phase in the transition connection layer are connected to each other, and the glass phase in the transition connection layer and a base of the first inorganic layer (or the second inorganic layer) mutually permeate, whereby the content of the glass phase in the heating layer near the first inorganic layer (or the second inorganic layer) side is greater than the content of the glass phase in the heating layer far from the first inorganic layer (or the second inorganic layer), and the content of the weakly magnetic metal material in the heating layer near the first inorganic layer (or the second inorganic layer) side is less than the content of the weakly magnetic metal material in the heating layer far from the first inorganic layer (or the second inorganic layer).
In the embodiment of the present invention, the requirements for the drying temperature and the sintering temperature during the preparation of the heat generating layer are the same as those for the heating layer, and are not described herein again. In the preparation process of the transition connection layer, the requirements for the drying temperature and the sintering temperature are the same as those of the heating layer, and are not described herein again.
According to another embodiment of the present invention, the heat generating layer slurry includes a weakly magnetic metal material, an organic solvent, and an inorganic frit, and the transition connection layer slurry includes an organic solvent, an inorganic frit, and a weakly magnetic metal material in an amount of 0 or more. The weak magnetic metal material is used for generating eddy current under the action of alternating magnetic field and further generating heat, and preferably, the weak magnetic metal material is at least one selected from silver, aluminum and copperFirstly, performing primary treatment; the inorganic glaze is used for forming a glass phase in the sintering process of the heating layer, and is selected from SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a). The heating layer is connected with the first inorganic layer and/or the second inorganic layer through the glass phase, so that the function of connecting the first inorganic layer and/or the second inorganic layer is realized; the organic solvent is used for uniformly dispersing the weak magnetic metal material and the inorganic glaze material in the organic solvent to form uniform and stable heating layer slurry and transition connection layer slurry.
In the embodiment of the present invention, the specific type of the organic solvent is not particularly limited, and those skilled in the art can select the organic solvent at will according to actual needs, and only the weakly magnetic metal material and the inorganic glaze material are uniformly dispersed in the organic solvent to form uniform and stable heat generating layer slurry and transition connection layer slurry.
According to another embodiment of the present invention, the organic solvent is an alcohol solvent, such as ethanol, methanol, propanol, etc., and the alcohol solvent has an advantage of being easily volatilized.
According to another embodiment of the present invention, the solid content of the heat generating layer slurry is in a range of 60 to 90wt%, and thus the heat generating layer slurry having the solid content in the above range is prepared to have better uniformity of the heat generating layer, thereby further improving the heat generating efficiency of the heating layer.
According to yet another specific embodiment of the present invention, before preparing the heating layer on the first inorganic layer, further comprises: be close to on the first inorganic layer one side preparation first bonding glaze layer of zone of heating, through preparing first bonding glaze layer between first inorganic layer and zone of heating, the thermal resistance between zone of heating and the first inorganic layer has been improved, it forms the focus to reduce the heat in first inorganic layer, thereby make the dispersion transmission that the heat can be more even, avoided forming heat stress because the focus in first inorganic layer, the risk that first inorganic layer takes place to break has been reduced, the noise is reduced, the cohesion between layer and the first inorganic layer that generates heat has still been improved simultaneously.
According to yet another specific embodiment of the present invention, before preparing the heating layer on the second inorganic layer, further comprises: the second inorganic layer is close to one side of the heating layer, a second bonding glaze layer is prepared, the second bonding glaze layer is prepared between the second inorganic layer and the heating layer, on one hand, the thermal resistance between the heating layer and the second inorganic layer is improved, the heat transfer to the first inorganic layer is further promoted, on the other hand, the efficiency of the heat transfer to the second inorganic layer is also reduced, the heat loss is reduced, hot spots formed in the second inorganic layer by the heat are also reduced, the heat can be uniformly dispersed and transferred, the heat stress formed in the second inorganic layer due to the hot spot accumulation is reduced, the risk of fracture of the second inorganic layer is reduced, meanwhile, the binding force between the heating layer and the second inorganic layer is also improved, and the overall mechanical strength of the heating body assembly is improved.
According to still another specific embodiment of the present invention, after preparing the heating layer on the first inorganic layer, further comprising: and preparing the second bonding glaze layer on one side of the second inorganic layer close to the heating layer. According to still another specific embodiment of the present invention, after preparing the heating layer on the first inorganic layer, further comprising: and preparing the second bonding glaze layer on one side of the heating layer close to the second inorganic layer. From this, through preparing the second bonding glaze layer between second inorganic layer and zone of heating, on the one hand, improved the thermal resistance between zone of heating and the second inorganic layer, further promote heat to first inorganic layer transmission, on the other hand, still reduced the efficiency of heat to the inorganic layer transmission of second, the heat is lost and lost, and still reduced the heat and formed the focus in the inorganic layer of second, thereby make the dispersion transmission that the heat can be more even, reduced and piled up and form thermal stress in the inorganic layer of second because the focus, the risk that the inorganic layer of second takes place to break has been reduced, the cohesion between zone of heating and the inorganic layer of second has still been improved simultaneously, thereby the holistic mechanical strength of heating member subassembly has been improved.
In the embodiment of the present invention, the specific method for preparing the first bonding glaze layer (or the second bonding glaze layer) is not particularly limited, and one skilled in the art can optionally select the method according to actual needs, and as a specific example, the specific method for preparing the first bonding glaze layer is: printing a first adhesive glaze layer slurry on the first inorganic layer, drying, and then firing to bond the first adhesive glaze layer to the first inorganic layer. The second bonding glaze layer is prepared by the same method, and details are not repeated.
In the embodiment of the present invention, the drying temperature in the process of preparing the first bonding glaze layer (or the second bonding glaze layer) is not particularly limited, and those skilled in the art can select the drying temperature according to actual needs, and as a preferable scheme, the drying temperature is in the range of 120 to 160 ℃. In the embodiment of the present invention, the firing temperature is not particularly limited in the process of preparing the first bonding glaze layer (or the second bonding glaze layer), and may be selected by those skilled in the art according to actual needs, and as a preferable mode, the firing temperature is in the range of 550 to 650 ℃, so that the inorganic glaze material in the first bonding glaze layer slurry (or the second bonding glaze layer slurry) can be ensured to form a glass phase, and the bonding strength with the inorganic layer or the heating layer can be ensured.
According to another specific embodiment of the present invention, the first bonding glaze layer slurry comprises an inorganic glaze material selected from SiO and an organic solvent 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a). In the embodiment of the present invention, the specific type of the organic solvent is not particularly limited, and those skilled in the art can freely select the organic solvent according to actual needs, and only the inorganic glaze material is uniformly dispersed in the organic solvent to form uniform and stable first bonding glaze layer slurry. The organic solvent for forming the first adhesive glaze layer slurry is generally an alcohol solvent, and the alcohol solvent has the characteristic of easy volatilization.
According to another embodiment of the present invention, the solid content of the first glaze layer slurry is in a range of 60 to 90wt%, so that the first glaze layer slurry with the solid content in the above range can be prepared to have a better uniformity of the first glaze layer. The requirements of the second bonding glaze layer slurry are the same as those of the first bonding glaze layer slurry, and the details are not repeated.
In an embodiment of the present invention, after preparing a first adhesive glaze layer on the first inorganic layer, a heating layer is further prepared on the first adhesive glaze layer, so that the first inorganic layer and the heating layer are connected through the first adhesive glaze layer. The method for preparing the heating layer on the first bonding glaze layer is the same as the method for preparing the heating layer on the first inorganic layer, and is not described in detail herein.
S220: and sintering the first inorganic layer and the second inorganic layer on which the heating layer is formed, or sintering the second inorganic layer and the first inorganic layer on which the heating layer is formed, so that the heating layer is bonded with the first inorganic layer and the second inorganic layer, respectively, to obtain the heating element assembly.
According to still another embodiment of the invention, the temperature of the above sintering is 550 to 650 ℃, whereby the bonding force between the first inorganic layer and the second inorganic layer in the above heat-generating body assembly obtained by sintering in this temperature range is better.
In addition, a person skilled in the art may prepare the first bonding glaze layer on the first inorganic layer, then prepare the heating layer on the first bonding glaze layer, and finally fire and bond the first inorganic layer bonded with the first bonding glaze layer and the heating layer and the second inorganic layer to obtain the heating element assembly. Or preparing a second bonding glaze layer on the second inorganic layer, then preparing a heating layer on the second bonding glaze layer, and finally sintering and bonding the second inorganic layer bonded with the second bonding glaze layer and the heating layer and the first inorganic layer to obtain the heating body assembly. Or preparing a heating layer on the first inorganic layer, preparing a second bonding glaze layer on the heating layer, and finally sintering and bonding the first inorganic layer and the second inorganic layer which are bonded with the second bonding glaze layer and the heating layer to obtain the heating component. The heating element may be obtained by preparing a heating layer on a first inorganic layer, preparing a second adhesive glaze layer on a second inorganic layer, and finally firing and bonding the first inorganic layer bonded with the heating layer and the second inorganic layer bonded with the second adhesive glaze layer. The specific process is not particularly limited, and those skilled in the art can select the specific process at will according to actual needs.
Further, in the preparation of the first glaze layer and the heating layer on the first inorganic layer, the first glaze layer slurry may be printed on the first inorganic layer, dried, and then fired to bond the first glaze layer to the first inorganic layer, and the heating layer slurry may be printed on the first glaze layer, dried, and then fired to bond the heating layer to the first glaze layer. The first adhesive glaze layer slurry can be printed on the first inorganic layer and dried, then the heating layer slurry is printed on the dried first adhesive glaze layer and dried, and finally the first inorganic layer and the heating layer are bonded together through the first adhesive glaze layer by sintering.
Further, when the heating layer and the second glaze layer are formed on the first inorganic layer, the heating layer slurry may be printed on the first inorganic layer, dried, and then fired to bond the heating layer to the first inorganic layer, and the second glaze layer slurry may be printed on the heating layer, dried, and then fired to bond the second glaze layer to the heating layer. Alternatively, the heating layer slurry may be printed on the first inorganic layer, and then dried, and then the second bonding glaze layer slurry may be printed on the dried heating layer, and then dried and finally sintered together, so that the first inorganic layer, the heating layer and the second bonding glaze layer are bonded together.
Further, when the second glaze layer is formed on the second inorganic layer, the heating layer slurry may be printed on the first inorganic layer, dried, and then fired so that the heating layer is bonded to the first inorganic layer, and then the second bonding glaze layer slurry may be printed on the second inorganic layer, dried, and then fired so that the second bonding glaze layer is bonded to the second inorganic layer. The heating layer slurry may be printed on the first inorganic layer, and then dried, and then the second bonding glaze layer slurry may be printed on the second inorganic layer, and then dried, and finally sintered together, so that the first inorganic layer, the heating layer, the second bonding glaze layer, and the second inorganic layer are bonded together.
Further, when the second glaze layer and the heating layer are formed on the second inorganic layer, the second glaze layer slurry may be printed on the second inorganic layer, dried, and then fired so that the second glaze layer is bonded to the second inorganic layer, and the heating layer slurry may be printed on the second glaze layer, dried, and then fired so that the heating layer is bonded to the second glaze layer. Or printing a second bonding glaze layer slurry on the second inorganic layer, drying, printing a heating layer slurry on the dried second bonding glaze layer, drying, and sintering together to bond the second inorganic layer and the heating layer together through the second bonding glaze layer.
According to the method of manufacturing the above heat-generating body assembly of the embodiment of the invention, by providing the heating layer between the first inorganic layer and the second inorganic layer, the speed of heat generated by the heating layer under the action of the alternating magnetic field being transferred through the first inorganic layer and the second inorganic layer is different, thereby producing an advantageous direction of heat transfer, and the heat is more easily transferred to the inorganic layer having a high transfer speed. Meanwhile, the heating element assembly of the invention also reduces the noise generated when heating materials, particularly, if a single inorganic layer is arranged on one side of the heating layer, when the heating layer generates heat, the heat is transferred in the direction without the inorganic layer at a higher speed, so the generated noise is higher. In addition, the preparation method is simple and easy to implement.
In a third aspect of the invention, a heatable appliance is presented. According to an embodiment of the present invention, the heatable appliance includes the heat-generating body assembly described in the above embodiment or the heat-generating body assembly manufactured by the method described in the above embodiment, and the first inorganic layer is at least a part of a container constituting the heatable appliance. Therefore, the first inorganic layer with higher heat transfer speed forms at least one part of the cavity of the heatable appliance, and the heat generated by the heat generating layer is transferred to the first inorganic layer at a speed higher than that of the second inorganic layer, so that the heat is more easily transferred to the direction of the first inorganic layer, namely the heat is more easily transferred to the direction of the cavity of the heatable appliance, and the heatable appliance has higher heat transfer efficiency; meanwhile, the noise generated when the heatable appliance is used for heating materials is small.
According to a specific embodiment of the present invention, the heat-generating body assembly is provided at the bottom of the heatable appliance.
According to still another embodiment of the present invention, the heatable appliance includes a side wall 200 and a bottom wall which are hermetically connected, at least a part of the bottom wall being the heat-generating body assembly 100.
According to a further embodiment of the invention, the side wall of the heatable appliance is made of glass ceramics, high borosilicate glass or ceramics.
According to a further embodiment of the present invention, referring to fig. 6, a negative pressure air 300 is provided between the heating layer 3 and the edges of the first inorganic layer 1 and the second inorganic layer 2, thereby preventing the first inorganic layer and/or the second inorganic layer from being cracked by the expansion of the gas during the heating process.
According to still another embodiment of the present invention, the heat-generating body assembly 100 is joined to the side wall fuse 200 by welding (e.g., fusion welding) (refer to FIG. 6) or by an adhesive 400 (refer to FIG. 7).
According to another embodiment of the present invention, the welding process comprises: (i) preheating the heater assembly; (ii) Welding the edge of the preheated heating body assembly and the side wall by adopting a heat source; (iii) annealing the welded vessel.
According to another embodiment of the present invention, the binder is organic silica gel, glass cement or inorganic glass paste.
According to another embodiment of the present invention, the heatable appliance is a pot (refer to fig. 8), a liner or a pot body of a cooking appliance.
In a fourth aspect of the invention, a cooking appliance is presented. According to an embodiment of the present invention, the cooking appliance has the heatable appliance described in the above embodiment. Therefore, the cooking utensil is high in heat transfer efficiency, and meanwhile, the cooking utensil generates small noise when heating materials, so that the requirements of consumers are further met, and the user experience is improved.
The following detailed description of the embodiments of the present invention is provided for the purpose of illustration only and should not be construed as limiting the invention. In addition, all reagents used in the following examples are commercially available or can be synthesized according to methods herein or known, and are readily available to those skilled in the art for reaction conditions not listed, if not explicitly stated.
Example 1
The embodiment provides an electromagnetic glass kettle, and a preparation method thereof is as follows:
(1) Printing heating layer slurry on upper glass with thickness of 0.3mm, drying at 140 deg.C, and firing at 600 deg.C, wherein the heating layer slurry is prepared from ethanol, silver powder, and inorganic glaze (including SiO) 2 、Al 2 O 3 、K 2 O、B 2 O 3 And Bi 2 O、Ti 2 O) at a solid content of 75wt%, whereby the heating layer was sintered on the first upper glass.
(2) Printing a second bonding glaze layer slurry on lower glass with the thickness of 2mm, drying, and then firing, wherein the drying temperature is 140 ℃, the firing temperature is 600 ℃, and the second bonding glaze layer slurry is ethanol and inorganic glaze materials (including SiO) 2 、Al 2 O 3 、K 2 O、B 2 O 3 And Bi 2 O、Ti 2 O) with a solid content of 75wt%, and forming a second bonding glaze layer after sintering.
(3) And firing and bonding the upper layer glass bonded with the heating layer and the lower layer glass bonded with the second bonding glaze layer at the firing temperature of 650 ℃ to obtain the heating body assembly.
(4) The heating element assembly is connected with the glass side wall in a fusion welding mode, the electromagnetic glass kettle is prepared, and the specific process is as follows: (i) preheating the heater assembly; (ii) Welding the edge of the preheated heating body assembly and the side wall by adopting a heat source; (iii) annealing the welded vessel.
(5) 1L of water is filled in the electromagnetic glass kettle, the electromagnetic glass kettle is placed on an electromagnetic oven with the power of 1500W, the time required for heating the water to boil is tested and recorded, the highest temperature at the bottom of the electromagnetic glass kettle is tested and recorded, meanwhile, the highest noise generated by the electromagnetic glass kettle in the heating process is tested and recorded, and the test results are shown in Table 1.
Example 2
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 0.3mm, the thickness of the lower glass layer was 3mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 3
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 0.3mm, the thickness of the lower glass layer was 4mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 4
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 0.5mm, the thickness of the lower glass layer was 2mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 5
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 0.5mm, the thickness of the lower glass layer was 3mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 6
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 0.5mm, the thickness of the lower glass layer was 4mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 7
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 1mm, the thickness of the lower glass layer was 2mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 8
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 1mm, the thickness of the lower glass layer was 3mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 9
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 1mm, the thickness of the lower glass layer was 4mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 10
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 2mm, the thickness of the lower glass layer was 2mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 11
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 2mm, the thickness of the lower glass layer was 3mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Example 12
In this example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 2mm, the thickness of the lower glass layer was 4mm, the other contents were the same as in example 1, and the test results are shown in table 1.
Comparative example 1
In this comparative example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 3mm, the thickness of the lower glass layer was 0.3mm, the other contents were the same as in example 2, and the test results are shown in table 1.
Comparative example 2
In this comparative example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 3mm, the thickness of the lower glass layer was 0.5mm, and the other contents were the same as in example 5, and the test results are shown in table 1.
Comparative example 3
In this comparative example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 3mm, the thickness of the lower glass layer was 1mm, the other contents were the same as in example 8, and the test results are shown in table 1.
Comparative example 4
In this comparative example, the thickness of the upper glass layer of the heating element assembly at the bottom of the electromagnetic glass kettle was 3mm, the thickness of the lower glass layer was 2mm, the other contents were the same as in example 11, and the test results are shown in table 1.
TABLE 1
Figure BDA0003290339650000191
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Figure BDA0003290339650000201
As can be seen from Table 1, in the examples 1-12 of the present invention, the time required for heating 1L of water to 100 ℃ is short, and is controlled to be below 6.5min, and the noise is small, and is controlled to be below 65 dB; especially, in the embodiment 5, when the thickness of the upper glass plate is 0.5mm and the thickness of the lower glass plate is 3mm, the working noise can be reduced to 60dB, the thermal efficiency is high, the boiling time of 1L of water is 4min, the highest temperature of the bottom is 160 ℃, the use process is safe, the internal stress of the glass is small, and the service life is long. In comparative examples 1-4, heating 1L of water to 100 ℃ required longer time, all at more than 14 min; and the highest temperature of the bottom reaches more than 300 ℃, so the use process is dangerous.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (26)

1. A heat-generating body assembly characterized by comprising: the heating layer is heated to generate heat, and the speed of the heat transferred to the first inorganic layer is different from the speed of the heat transferred to the second inorganic layer.
2. A heat generator assembly as set forth in claim 1 wherein the heat is transferred to the first inorganic layer at a greater rate than to the second inorganic layer.
3. A heat-generating body assembly as described in claim 1, wherein a thickness of the second inorganic layer is not less than a thickness of the first inorganic layer.
4. A heat generating body assembly as described in claim 3, characterized in that the difference in thickness of the second inorganic layer from the first inorganic layer is not more than 4.5mm, preferably the difference in thickness of the second inorganic layer from the first inorganic layer is 0.5 to 3mm.
5. A heat-generating body assembly as described in claim 3, characterized in that the thickness ratio of the second inorganic layer to the first inorganic layer is more than 1 and 15 or less, preferably more than 1 and 10 or less.
6. A heat-generating body assembly as described in claim 5, characterized in that the thickness of the second inorganic layer is not less than 2mm, and the thickness of the first inorganic layer is not more than 2mm.
7. A heat-generating body assembly as described in claim 5, characterized in that the thickness of the first inorganic layer is 0.3 to 2mm and the thickness of the second inorganic layer is 2 to 4mm.
8. A heat-generating body assembly as described in any one of claims 1 to 7, characterized in that at least one of the following conditions is satisfied:
the thickness of the heating layer is 10-25 μm;
the heating layer includes a weakly magnetic metal material and a glassy phase.
9. A heat-generating body assembly as described in claim 8, characterized in that at least one of the following conditions is satisfied:
the content of the weak magnetic metal material in the heating layer is 70-90wt%;
the weakly magnetic metal material is selected from at least one of silver, aluminum and copper;
the material of the glass phase comprises SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a).
10. The heat-generating body assembly as described in any one of claims 1 to 7, wherein the first inorganic layer is connected to the heating layer through a first bonding glaze layer, and the second inorganic layer is connected to the heating layer through a second bonding glaze layer;
or the first inorganic layer is connected with the heating layer through a first bonding glaze layer, and the second inorganic layer is directly connected with the heating layer;
or the second inorganic layer is connected with the heating layer through a second bonding glaze layer, and the first inorganic layer is directly connected with the heating layer;
or the first inorganic layer and the second inorganic layer are respectively directly connected with the heating layer.
11. The heat-generating body assembly as described in claim 10, wherein the thickness of each of the first bonding glaze layer and the second bonding glaze layer is independently larger than the thickness of the heating layer.
12. The heat-generating body assembly as described in claim 11, wherein the thickness of each of the first bonding glaze layer and the second bonding glaze layer is independently 5 to 30 μm.
13. The heat-generating body assembly as described in claim 10, wherein the first bonding glaze layer and/or the second bonding glaze layer is at least partially embedded in the heating layer.
14. The heat-generating body assembly as described in claim 13, wherein the glaze in the first bonding glaze layer and the second bonding glaze layer each independently comprises SiO 2 、Al 2 O 3 、Bi 2 O、Ti 2 O、K 2 O and B 2 O 3 At least one of (a).
15. A heat-generating body assembly as described in claim 8, wherein said heating layer is directly connected to said first inorganic layer and/or said second inorganic layer, the weakly magnetic metal material in said heating layer is disposed away from said first inorganic layer and/or said second inorganic layer, and the glass in said heating layer is disposed adjacent to said first inorganic layer and/or said second inorganic layer.
16. The heat-generating body assembly according to claim 15, wherein the heating layer is connected to the first inorganic layer and/or the second inorganic layer by a textured structure in which a glass phase in the heating layer is at least partially embedded in the first inorganic layer and/or the second inorganic layer.
17. A heat generating body assembly as described in claim 15, wherein the heating layer comprises a heat generating layer and a transition connection layer, the heat generating layer is connected with the first inorganic layer and/or the second inorganic layer through the transition connection layer, the heat generating layer comprises a weakly magnetic metal material and a glass phase, the transition connection layer comprises a glass phase, and the glass phase in the heat generating layer is connected with the glass phase in the transition connection layer.
18. A heat-generating body assembly as described in claim 17, characterized in that at least one of the following conditions is satisfied:
the components of the glass phase in the transition connection layer are the same as those of the glass phase in the heating layer;
the transition connection layer does not contain a weak magnetic metal material;
the thickness of the transition connecting layer is 0.1-5 microns.
19. A heat generator assembly as set forth in claim 17 wherein the magnetically weak metal material in the heat generating layer is at least partially embedded in the transition connection layer.
20. The heat generator assembly as claimed in any one of claims 1 to 7, wherein the first inorganic layer and the second inorganic layer are each independently a glass layer or a ceramic layer.
21. A method of producing the heat-generating body assembly as described in any one of claims 1 to 20, characterized by comprising:
(1) Providing a first inorganic layer and a second inorganic layer;
(2) A heating layer is formed between the first inorganic layer and the second inorganic layer to obtain a heat-generating body assembly.
22. The method of claim 21, wherein the step of forming a heating layer between the first inorganic layer and the second inorganic layer to obtain a heat-generating body assembly further comprises: forming a first bonding glaze layer on one side, close to the heating layer, of the first inorganic layer; and/or forming a second bonding glaze layer on one side of the second inorganic layer close to the heating layer.
23. A heatable device comprising the heat-generating body assembly as set forth in any one of claims 1 to 20 or the heat-generating body assembly produced by the method as set forth in claim 21 or 22, the first inorganic layer being at least a part of a container constituting the heatable device.
24. The heatable tool according to claim 23 wherein the heat-generating body assembly is provided at the bottom of the heatable tool;
and/or negative pressure air is arranged between the heating layer and the edges of the first inorganic layer and the second inorganic layer.
25. The heatable appliance of claim 23, including a side wall and a bottom wall sealingly connected, at least a portion of the bottom wall being the heat generator assembly;
and/or the heating element assembly is connected with the side wall through welding or bonding agent.
26. A cooking appliance having a heatable appliance as claimed in any one of claims 23 to 25.
CN202111161366.3A 2021-09-30 2021-09-30 Heating element assembly and preparation method and application thereof Pending CN115886569A (en)

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