CN213850097U - Thick film heating electric appliance - Google Patents

Abstract

The application discloses thick film heating electrical apparatus, including the kettle body, end substrate, heating thick film and circuit spare, the kettle body is including at the bottom of kettle wall and the kettle, and on the bottom of the outer kettle of kettle was fixed in to the subbase material, the heating thick film covered on the substrate at the bottom, and the position of being different from the heating thick film on the substrate at the bottom was seted up flutedly, and the circuit spare is through fixing on the substrate at the bottom of the bolt fastening on the recess, and the heating thick film is in generate heat and heat under the circumstances of circuit spare circular telegram the kettle body. In the thick film heating electrical apparatus that this application provided, the position of heating the thick film is different from on the end substrate is seted up flutedly, and the bolt fastening of fixed circuit spare can increase the area of contact of bolt and end substrate in the recess that this application set up in the subbase material for the bolt is difficult to drop, thereby increases the stability of the fixed circuit spare of wanting.

Description

Thick film heating electric appliance

Technical Field

The application relates to the technical field of fluid heating, in particular to a thick film heating electric appliance.

Background

An electric heating kettle, also called an electric kettle, is a water boiling tool commonly used in daily life of people, the electric kettle on the market is connected with a power supply based on a circuit part on the electric kettle, a bolt is generally welded at the bottom of the kettle in a mode of fixing the circuit part, the circuit part is further fixed based on the bolt, but the welded bolt is easy to fall off, the stability of the circuit part to be fixed is influenced, and the use experience of a user is influenced in the use process of the user.

SUMMERY OF THE UTILITY MODEL

The application provides a thick film heating electrical apparatus to welded bolt easily drops and influences the problem that the user used in solving current thick film heating electrical apparatus.

The application provides a thick film heating electrical apparatus, includes:

the kettle body comprises a kettle wall and a kettle bottom;

the bottom base material is fixed on the kettle bottom outside the kettle body;

the heating thick film is covered on the bottom base material, and a groove is formed in the position, different from the position of the heating thick film, on the bottom base material;

the circuit part is fixed on the bottom base material through a bolt fixed on the groove, and the heating thick film generates heat to heat the kettle body under the condition that the circuit part is electrified.

Alternatively, the recess may have an internal thread, and a bolt having an external thread may be fitted to the internal thread of the recess to fix or separate the bolt with respect to the base substrate.

Optionally, the fixing portion of the bolt is in an inverted frustum shape, and the fixing portion of the bolt can be embedded into the groove to fix the bolt on the base substrate.

Optionally, the bolt is fixed in the groove by welding.

Optionally, the heating thick film is provided with a through hole, and the groove is formed in the position of the through hole on the bottom substrate.

Optionally, the position on the bottom substrate, at the periphery of the heated thick film, is an edge region, and the groove is formed in the edge region on the bottom substrate.

Optionally, the bottom substrate is provided with three grooves, and connecting lines of the three grooves form a triangle.

Optionally, a groove is formed in the kettle bottom of the kettle body, and the bottom base material is arranged in the groove.

Optionally, the groove of the kettle body is provided with an internal thread, the edge of the bottom base material is provided with an external thread, and the external thread is matched with the internal thread of the kettle body so as to keep the bottom base material and the kettle body relatively fixed or separated when the bottom base material rotates relative to the kettle body.

Optionally, the bottom base material is in a circular truncated cone shape, the area of the lower bottom surface of the bottom base material is slightly larger than the cross-sectional area of the groove at the bottom of the kettle, and the upper bottom surface of the bottom base material can be embedded into the groove at the bottom of the kettle to fix the bottom base material at the bottom of the kettle body.

In the thick film heating electrical apparatus that this application provided, the position of heating the thick film is different from on the end substrate is seted up flutedly, and the bolt fastening of fixed circuit spare can increase the area of contact of bolt and end substrate in the recess that this application set up in the subbase material for the bolt is difficult to drop, thereby increases the stability of the fixed circuit spare of wanting.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a side view of a thick film heating appliance provided in an embodiment of the present application;

FIG. 2 is a cross-sectional view of the thick film heating appliance of FIG. 1;

FIG. 3 is a partial cross-sectional view of the thick film heating appliance of FIG. 1;

FIG. 4 is a top view of a first heated thick film provided by an embodiment of the present application;

FIG. 5 is a top view of a second heated thick film provided by an embodiment of the present application;

FIG. 6 is a bottom view of the heated thick film of FIG. 3;

fig. 7 is a schematic view of a base of a thick film heating apparatus according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a first structure of a thick film heating electric kettle bottom according to an embodiment of the present disclosure;

FIG. 9 is a schematic view of a second structure of a thick film heating electric kettle bottom according to an embodiment of the present application;

FIG. 10 is a partial cross-sectional view of a first thick film electric kettle base according to an embodiment of the present disclosure;

fig. 11 is a partial cross-sectional view of a second thick film heating electric kettle bottom according to the embodiment of the present application.

Detailed Description

In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise" indicate orientations or positional relationships based on the orientation or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The thick film heating electric appliance 10 provided by the embodiment of the application can be a heating device such as an electric kettle, a soybean milk machine and the like as shown in fig. 1. The thick film heating device 10 provided by the embodiment of the application comprises a kettle body 11, a base material 12, a heating thick film 13 and a circuit component 14. Referring to fig. 2, fig. 2 is a cross-sectional view of the thick film heating electric appliance shown in fig. 1, the pot body 11 includes a pot wall 111, a pot bottom 112 and an outer shell 113, the pot wall and the pot bottom form a liquid storage cavity 114 for containing a fluid medium to be heated, and an opening is formed in an upper portion of the liquid storage cavity, so that the fluid medium such as water, soybean milk or milk can be poured into the opening and contained in the liquid storage cavity. The lower outer housing 113 may also include a handle 1131 and a lid 1132 in some examples. It should be understood that the shape of the kettle body enclosed by the kettle wall can be a cylinder with the same diameter from top to bottom or a cylinder with a smaller top and a larger bottom. In some examples, the kettle wall and the kettle bottom can be integrally formed structural members, and the assembled kettle wall and the kettle bottom can be regarded as a stainless steel inner container of the thick film heating electric appliance. The inner wall of the stainless steel inner container can be coated with an anti-scale coating, such as a ceramic anti-scale coating or a Teflon anti-scale coating, so that particles generated in the heating process of a fluid medium are prevented from depositing on the inner wall of the stainless steel inner container to form scales.

Referring to fig. 3, fig. 3 is a partial component of the thick film heating electric appliance 10 shown in fig. 1, which includes a pot wall 111, a pot bottom 112, a bottom base material 12 fixed on the pot bottom outside the pot body, a heating thick film 13 covering the bottom base material 12, and a circuit component 14 disposed on the pot bottom.

The bottom substrate 12 is fixed on the kettle bottom outside the kettle body, and may be a plate body with a certain thickness, which is equivalent to the bottom plate of the thick film heating electric appliance 10. The shape of the base substrate 12 (e.g., a top view shape or an orthographic projection shape) is not limited, and may be, for example, a circle, a rectangle or a polygon, and only needs to be adapted to the structural design of the thick film heater 10. In addition, according to the design requirement of the thick film heating appliance 10, other structural properties of the base substrate 12 can also be designed adaptively, for example, when the kettle bottom 112 needs to have higher structural strength, the base substrate 12 can be a metal substrate, such as a stainless steel plate, but it can also be other material plates with better structural strength.

The heating thick film covered on the base substrate includes an insulating layer, a heat generating coil and an encapsulation layer. The insulating layer is directly arranged on the surface of the bottom base material and is used for preventing the heating coil from being electrically connected with the bottom base material made of metal materials. The insulating layer can be formed on the base substrate directly by using an insulating material in a film forming manner, such as sputtering or evaporation, or the insulating layer can be attached to the base substrate by using an adhesive. The packaging layer covers the heating coil, and covers the insulating layer and the bottom base material. The packaging layer is an electric insulating layer, and the packaging layer has good heat conducting performance and is beneficial to directly transferring heat generated by the heating coil to fluid media such as water and the like needing to be heated. The heating coils in the heating thick film can be multiple, the cross section area of each heating coil can be the same or different, the heating coils with different cross section areas have different resistivity, and different heat energy can be generated under the condition of electrifying, so that the fluid medium in the liquid storage cavity can be heated. Referring to fig. 4 and 5, the heat generating coil 131 includes a first heat generating coil 1311 and a second heat generating coil 1312 in the heating thick film 13 shown in fig. 4 and 5. In the heating thick film shown in fig. 4 and 5, both heating coils are alternately arranged. In the heating thick film 13 shown in fig. 4, the first heat-generating coil 1311 and the second heat-generating coil 1312 have the same cross-sectional area, whereas in the heating thick film 13 shown in fig. 5, the first heat-generating coil 1311 and the second heat-generating coil 1312 have different cross-sectional areas. The heat generating coil is only briefly described here, and the detailed description of the heat generating coil is described later.

In the prior art, power pads are arranged at two ends of the heating coil, a conductive wire is directly soldered on the power pads and coated with insulating glue, the other end of the conductive wire is connected with a power supply, and the heating coil can convert electric energy into heat energy to heat a fluid medium in the kettle body under the condition of electrifying. In the thick film heating electrical apparatus provided by the embodiment of the application, the two ends of the heating coil are also provided with first conductive pieces, the first conductive pieces can be connected with corresponding second conductive pieces on a circuit piece in the thick film heating electrical apparatus, and when the circuit piece is powered on, the first conductive pieces can transmit electric energy based on the connection with the second conductive pieces so as to heat fluid media contained in the kettle body by the heat energy generated by the heating coil. It should be understood that the first and second conductive elements do not refer to only two conductive elements in the thick film heater, the first conductive element refers to the conductive element at both ends of the heating coil, and the second conductive element refers to the conductive element on the circuit element corresponding to the first conductive element. Referring to fig. 4 and 5, the first conductive members 132 are disposed at both ends of the heat generating coil.

In some examples, the circuit element may be fixed in the outer casing of the base substrate, while in the embodiments of the present application, for the convenience of the user, the circuit element is split into two parts, including a kettle body circuit element and a base circuit element which are separable and can be electrically connected, the kettle body circuit element is fixed on the base substrate of the kettle body, and in some examples, the kettle body circuit element may be arranged in the outer casing of the kettle body. The kettle body circuit piece and the base circuit piece can be connected with each other in a plugging way, and the power supply is disconnected in a separation way, so that the kettle is convenient for users to use. As illustrated in fig. 6 and 7, fig. 6 is a bottom view of the thick film heater of fig. 3, fig. 6 includes a kettle bottom 112, a base substrate 12, a heating thick film 13 and a kettle body circuit part 141, fig. 7 shows a base with a base circuit part 142, and a user can place the thick film heating appliance 10 on the base to electrically connect the kettle body circuit part with the base circuit part.

In the thick film heating electrical apparatus that this application provided, the position of being different from the heating thick film on the end substrate is seted up flutedly, is fixed with the bolt in the recess, and the circuit part is through fixing the bolt fastening on the recess on the end substrate. The bolt can be fixed in the groove by welding. Referring to fig. 8, fig. 8 shows the pot bottom 112, the bottom base 12, the groove 121 partially opened on the bottom base and the bolt 122 partially fixed in the groove, and the heating thick film 13 covering the bottom base 12, the groove provided in the bottom base can increase the contact area between the bolt and the bottom base, so that the bolt is not easy to fall off, thereby increasing the stability of the circuit component to be fixed.

In some examples, the groove on the base substrate has an internal thread, and the bolt having the external thread may be fitted with the internal thread of the groove to relatively fix or separate the bolt from the base substrate. In other examples, the portion of the bolt embedded in the bottom base material is in an inverted truncated cone shape, and the bolt can be fixed on the bottom base material by welding.

It should be noted that the heating thick film is not entirely planar, and in some examples the heating thick film has a through hole, and the recess for fixing the bolt may be formed in the bottom substrate at a position where the through hole of the heating thick film is located. Referring to fig. 9, fig. 9 also shows a through hole 131 on the heated thick film 13, a groove 121 is formed at the position of the through hole 131 on the base substrate 12, and the bolt 122 is fixed in the groove 121. It should be understood that the position of the periphery of the heated thick film on the bottom substrate is an edge region, and the groove is also formed in the edge region on the bottom substrate. In some examples, three grooves may be formed on the bottom substrate, and the connecting lines of the three grooves may form a triangle (the triangle is relatively stable), such as three black dots in fig. 5.

Referring to fig. 10, in some embodiments, the thick film heating electric kettle bottom 112 has a groove 1121, and the base substrate 12 is disposed in the groove 1121. Therefore, the alignment precision of the base material and the kettle bottom can be reduced when an operator operates the kettle, the assembly of the thick film heating assembly and the kettle body is facilitated, and the size of the thick film heating assembly protruding out of the kettle bottom is reduced.

In some examples, the recess of the kettle body is provided with internal threads, and the edge of the bottom substrate is provided with external threads which cooperate with the internal threads of the kettle body to keep the bottom substrate relatively fixed or separated from the kettle body when the bottom substrate is rotated relative to the kettle body.

In other examples, the bottom base material is in the shape of a truncated cone, please refer to fig. 11, the area of the upper bottom surface of the bottom base material is smaller than the cross-sectional area of the groove of the kettle bottom, the area of the lower bottom surface of the bottom base material is slightly larger than the cross-sectional area of the groove of the kettle bottom, the upper bottom surface of the bottom base material can be embedded into the groove of the kettle bottom to fix the bottom base material at the bottom of the kettle body, likewise, in this example, the groove of the kettle body can also be provided with internal threads, the edge of the bottom base material can also be provided with external threads, and the internal threads and the external threads can be matched with each other.

The relevant contents of the heat generating coil will be described in detail later. Referring to fig. 4, the heat-generating coil includes a first heat-generating coil and a second heat-generating coil having the same cross-sectional area as the heat source, both of which are disposed on the insulating layer, and both of the two heat-generating coils are arranged on the plane of the insulating layer by winding, i.e., each heat-generating coil is arranged on the insulating layer one by one.

In order to reduce the occupied area of the first and second heat-generating coils, the first and second heat-generating coils may be respectively arranged along the shape of the base material in a winding manner, and the two heat-generating coils are alternately arranged, as shown in fig. 4, the base material is a circular substrate, the first heat-generating coil may be a heat-generating coil filament which is arranged in a plurality of circles as a whole, and similarly, the second heat-generating coil may also be a heat-generating coil filament which is also arranged in a plurality of circles as a whole, and the circles of the plurality of second heat-generating coils and the plurality of first heat-generating coils are alternately arranged, for example, a first heat-generating coil, a second heat-generating coil and a first heat-generating coil are sequentially arranged from inside to outside.

Connect the electricity respectively to first heating coil and second heating coil, both produce the heat under voltage drive, the heat directly transmits media such as water through the encapsulation layer, guarantee higher heating efficiency, and first heating coil and second heating coil winding distribute on insulating layer place plane, heating coil's distribution area is great, the heat of production is more dispersed, avoid forming local overheat area, the time of bubble thermal expansion grow slows down, can reduce the ruptured quantity of bubble, reduce the noise that the boiling water produced.

To achieve this, the first and second heating coils are required to be connected to a power source as an electric heating source, and referring to fig. 4, the thick film heating apparatus 10 may further be provided with a plurality of power pads 132 for connecting the two heating coils.

In one implementation, the number of the power pads is four, two power pads are respectively arranged at two ends of the first heating coil, and the other two power pads are respectively arranged at two ends of the second heating coil. In another implementation, as shown in fig. 4, there are three power pads, one of which is disposed at one end of the first heat-generating coil, the other of which is disposed at one end of the second heat-generating coil, and the remaining one of which is connected to both the other end of the first heat-generating coil and the other end of the second heat-generating coil, specifically, the other end of the first heat-generating coil and the other end of the second heat-generating coil are adjacent, and the remaining one power pad covers the other end of the first heat-generating coil and the other end of the second heat-generating coil.

It should be understood that the structural design of the heat generating coil in heating the thick film is not limited to the embodiment depicted in fig. 4. For example, the cross-sectional areas of the two first and second heat generating coils may not be the same. Referring to fig. 5, the cross-sectional area of the wire of the second heat-generating coil 1312 is smaller than that of the first heat-generating coil 1311, and the first heat-generating coil 1311 and the second heat-generating coil 1312 have the same resistivity.

For a wire of uniform thickness, the so-called wire cross-sectional area may mean the thickness of the wire, i.e., the single wire of the second heat-generating coil is thinner than the single wire of the first heat-generating coil, in other words, the first heat-generating coil is thicker and the second heat-generating coil is thinner.

According to the joule law relation 1-1 and the resistance and heat quantity relation 1-2, it can be known that the resistance and the cross-sectional area of the wire are in an inverse proportion relation, and the resistance and the heat quantity of the wire are in an inverse proportion relation, so that the heat quantity and the cross-sectional area are in a direct proportion relation through calculation.

Q = U2/R t relation 1-1

R = ρ × L/S relation 1-2

Wherein Q represents heat in joules (J); u represents a voltage in volts (V); r represents resistance in ohms (Ω); t represents time in seconds(s). ρ represents the resistivity of the wire, S represents the cross-sectional area of the wire, and L represents the length of the wire.

Since the second heat-generating coil is thin and the first heat-generating coil is thick for two heat-generating coils having the same resistivity, the second heat-generating coil generates a small amount of heat and the first heat-generating coil generates a large amount of heat when receiving the same voltage.

Here, the first heat-generating coil and the second heat-generating coil work together, the total heat generation amount is the sum of the heat generation amount Q1 of the first heat-generating coil and the heat generation amount Q2 of the second heat-generating coil, that is, the total heat generation amount Q0 is larger than the heat generation amount of any one of the heat-generating coils, Q0 > Q1 and Q0 > Q2, thereby facilitating the realization of rapid heating. After rapid heating, for example, after water is boiled, the thick film heating appliance 10 may be insulated using only the heat generating coil. In summary, the thick film heating apparatus 10 can achieve both the functions of rapid heating and thermal insulation.

In addition, first heating coil and second heating coil are as the heating source, through the respective generate heat of intelligent regulation first heating coil and second heating coil, when initial water temperature is lower, the water that is close to the heating source is difficult to by the vaporization, can let these two sets of heating coil work simultaneously, and when water is heated to the uniform temperature, can only let thicker first heating coil work, reduce the possibility that the water that is close to the heating source is vaporized, when water is heated again to higher uniform temperature, can only let thinner second heating coil work, thereby reduce the possibility that the water that is close to the heating source is vaporized once more.

For example, the power of the second heating coil is 600W, the power of the first heating coil is 1200W, when the initial water temperature is low, water close to the heating source is not easy to vaporize, the two groups of heating coils heat together, and the heating power is 1800W; when the water is heated to a certain temperature, for example 60 ℃, only the first heating coil of 1200W is operated, so that the possibility that the water close to the heating source is vaporized is reduced; when the water is reheated to a certain temperature, for example 90 c, only the second 600W heat-generating coil is operated, again reducing the likelihood that water approaching the heat source will be vaporized. In the whole heating process, the possibility that the water close to the heating source is vaporized is low, and the noise generated during water boiling is favorably reduced.

In the description herein, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily 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.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.

Claims (10)

1. A thick film heating appliance, said thick film heating appliance comprising:

the kettle body comprises a kettle wall and a kettle bottom;

the bottom base material is fixed on the kettle bottom outside the kettle body;

the heating thick film is covered on the bottom base material, and a groove is formed in the position, different from the position of the heating thick film, on the bottom base material;

the circuit part is fixed on the bottom base material through a bolt fixed on the groove, and the heating thick film generates heat to heat the kettle body under the condition that the circuit part is electrified.

2. A thick film heating appliance as claimed in claim 1 wherein said recess has internal threads and a bolt having external threads is engageable with said internal threads of said recess to secure or release said bolt relative to said base substrate.

3. A thick film heating appliance as claimed in claim 1 wherein the portion of said stud embedded in the base substrate is inverted frustoconical to effect fastening of said stud to said base substrate.

4. A thick film heating appliance as claimed in claim 1 wherein said bolts are secured in said recesses by welding.

5. The thick film heater of claim 1, wherein said heater thick film has through holes therein, said recesses being formed in said base substrate at locations of said through holes.

6. The thick film heating appliance of claim 1 wherein the location on said base substrate at the periphery of said heated thick film is an edge region and said recess is open at the edge region on said base substrate.

7. A thick film heating appliance as claimed in claim 1 wherein said base substrate is initially provided with three recesses, the lines of said three recesses forming a triangle.

8. A thick film heating appliance as claimed in any one of claims 1 to 7 wherein the base of the kettle body has a recess in which the base substrate is disposed.

9. A thick film heating appliance as claimed in claim 8 wherein the recess in the kettle body is provided with internal threads and the edge of the base material is provided with external threads which co-operate with the internal threads of the kettle body to maintain the base material fixed relative to or separated from the kettle body as the base material is rotated relative to the kettle body.

10. The thick film heating appliance as claimed in claim 8, wherein the bottom substrate is in the shape of a truncated cone, the area of the lower bottom surface of the bottom substrate is slightly larger than the cross-sectional area of the groove of the kettle bottom, and the upper bottom surface of the bottom substrate can be embedded into the groove of the kettle bottom to fix the bottom substrate on the bottom of the kettle body.

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