Electric kettle

Abstract

The utility model discloses an electric kettle, which belongs to the technical field of household appliances, solves the problem that a PTC (Positive Temperature Coefficient) heating element is easily separated from a shell after being arranged in the shell, and adopts the technical scheme that the electric kettle mainly comprises a kettle body, the kettle body comprises an inner container, a PTC heater is arranged on the outer bottom surface of the inner container, and the PTC heater comprises a shell and the PTC heating element. The shell is provided with a mounting hole for the PTC heating element to be inserted and mounted, the shell is provided with a first clamping wall and a second clamping wall which are opposite and a first curved wall and a second curved wall which are opposite at the periphery of the mounting hole, the first curved wall and the second curved wall are positioned between the first clamping wall and the second clamping wall, and the first curved wall and the second curved wall are bent and deformed, so that the PTC heating element can be inserted and mounted in the mounting hole. And the first clamping wall and the second clamping wall are close to each other so as to clamp and fix the PTC heating element. The utility model is mainly used for improving the reliability of fixing the PTC heating element in the shell.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an electric kettle. Background Art

[0002] In daily drinking, people are accustomed to drinking warm boiled water. In order to keep the liquid warm after boiling, a PTC heater is usually provided on the heating base of the electric kettle to heat and keep the liquid warm so that the liquid temperature is constant within a suitable drinking range.

[0003] For example, the patent with announcement number CN209419899U discloses a PTC heating element for electric kettles, which involves a heater and aims to solve the problem that the existing PTC heating element requires the staff to adjust the position of the heating body during production and processing, which affects the work efficiency. The key points of its technical solution are: it includes a heating body and a shell, the heating body includes a heating element and a high-temperature insulating paper wrapped outside, the upper and lower layers of one end of the high-temperature insulating paper are bonded to each other to form a terminal, the shell is provided with an inner cavity for accommodating the heating element, the inner cavity is open at both ends, and a block is arranged on the inner wall of the opening at one end of the inner cavity, the block is located in the thickness direction of the terminal, and the sum of the thickness of the block and the terminal is less than the thickness of the opening at the end of the inner cavity. The utility model of the PTC heating element for electric kettles can reduce the probability of the staff adjusting the heating body, improve work efficiency, and facilitate the staff to insert the heating body into the shell, reducing the adverse effects caused by excessive force. However, in actual use, after the heating body is inserted into the shell, there is no additional tightening force or other means to fix the heating body in the shell. When the wire of the heating body is subjected to tension, the heating body is easy to detach from the end of the shell without a block, causing the heating body to deviate from the original heating position and fail to heat normally. Utility Model Content

[0004] The utility model aims to provide an electric kettle, which solves the problem that a PTC heating element is easily removed from a shell after being installed in the shell, and improves the reliability of fixing the PTC heating element in the shell.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an electric kettle, comprising a kettle body, the kettle body comprising an inner liner, a PTC heater being arranged on the outer bottom surface of the inner liner, the PTC heater comprising an outer shell and a PTC heating element, the outer shell being provided with a mounting hole for inserting and installing the PTC heating element, the outer shell being provided with a first clamping wall and a second clamping wall relative to each other and a first curved wall and a second curved wall relative to each other on the outer periphery of the mounting hole, the first curved wall and the second curved wall being located between the first clamping wall and the second clamping wall, the first curved wall and the second curved wall being bent and deformed so that the first clamping wall and the second clamping wall are close to each other to clamp and fix the PTC heating element.

[0006] After adopting the above technical scheme, the utility model has the following advantages: through the bending deformation of the first curved wall and the second curved wall, the first clamping wall and the second clamping wall can cooperate with each other to clamp the PTC heating element, providing sufficient fastening force for clamping the PTC heating element to prevent the PTC heating element from loosening or falling off, and the fixing method of clamping and fixing the PTC heating element by the first clamping wall and the second clamping wall approaching each other not only improves the fixing reliability of the PTC heating element, but also makes the installation of the PTC heating element simpler, improves the installation efficiency of the PTC heating element, and at the same time, it is convenient for the later replacement of the PTC heating element; and the PTC heating element is clamped and fixed by the first clamping wall and the second clamping wall, so that the extrusion force of the first clamping wall and the second clamping wall on the PTC heating element is evenly distributed, which can avoid the PTC heating element being damaged by excessive local force.

[0007] Furthermore, the first curved wall and / or the second curved wall is bent from outside to inside relative to the mounting hole.

[0008] By adopting the above-mentioned technical solution, the first curved wall is bent from the outside to the inside relative to the mounting hole, and the first clamping wall and the second clamping wall are pressed to cause the first curved wall to deform inwardly, and it is not easy to rebound after deformation, thereby realizing the clamping of the PTC heating element by the first clamping wall and the second clamping wall; the second curved wall is bent from the outside to the inside relative to the mounting hole to achieve the same effect as mentioned above; and after the first curved wall and / or the second curved wall are bent inwardly, they will fill the space in the mounting hole, reduce the air volume, and facilitate the heat transfer of the PTC heating element to the outer shell, thereby improving thermal efficiency.

[0009] Furthermore, the first curved wall and / or the second curved wall is bent from inside to outside relative to the mounting hole.

[0010] By adopting the above-mentioned technical solution, the first curved wall and / or the second curved wall bends from the inside to the outside relative to the mounting hole, which will not occupy the effectively utilized space in the mounting hole. Under the same material conditions, a PTC heating element with larger volume and power can be placed, saving production costs.

[0011] Furthermore, the thickness of the first curved wall and / or the second curved wall is 1.0 mm to 2.0 mm.

[0012] Using the above technical solution, if the thickness of the first curved wall is less than 1.0 mm, the first curved wall will be too thin, and it will be easily bent excessively and damaged when deformation occurs, thereby causing the first clamping wall and the second supporting wall to lose connection, making it impossible to clamp the PTC heating element; if the thickness of the first curved wall is greater than 2.0 mm, the thickness of the first curved wall will be too large, and when deformation occurs, the bent part will be too thick and suffer stress concentration and fatigue failure, thereby failing to achieve long-term and reliable clamping of the PTC heating element; the thickness selection of the second curved wall is the same.

[0013] Furthermore, there is a gap between the PTC heating element and the first curved wall and the second curved wall.

[0014] By adopting the above-mentioned technical solution, the gap between the PTC heating element and the first curved wall and the second curved wall is used to provide the first curved wall and the second curved wall with the deformation space required for deformation, thereby facilitating the clamping of the PTC heating element by the first clamping wall and the second clamping wall; at the same time, the PTC heating element is prevented from abutting against the first curved wall and the second curved wall and being damaged.

[0015] Furthermore, the inner surfaces of the first clamping wall and the second clamping wall are planes.

[0016] By adopting the above-mentioned technical solution, the inner surfaces of the first clamping wall and the second clamping wall are flat, which can increase the contact area with the PTC heating element, so as to enhance the clamping effect of the first clamping wall and the second clamping wall on the PTC heating element. The force on the PTC heating element will also be more uniform, and it will not be easily damaged during the installation and clamping process, and it can also obtain long-term fixed reliability.

[0017] Furthermore, the PTC heating element is provided with two electrode plates, one of which is located between the PTC heating element and the first clamping wall, and the other electrode plate is located between the PTC heating element and the second clamping wall.

[0018] By adopting the above-mentioned technical solution, since the position of the electrode plate will affect the electric field distribution and current density distribution of the PTC heating element, thereby affecting the heating effect of the entire PTC heating element, by installing the two electrode plates between the PTC heating element and the first clamping wall and between the PTC heating element and the second clamping wall respectively, the electric field and current density of the PTC heating element can be more evenly distributed on the PTC heating element when it is working, thereby improving the efficiency and performance of the heater.

[0019] Furthermore, an insulating film sleeve is provided on the periphery of the PTC heating element to separate the PTC heating element from the housing.

[0020] By adopting the above-mentioned technical solution, the insulating film sleeve can separate the PTC heating element from the outer shell, avoiding problems such as short circuit or leakage between the PTC heating element and the external environment. The insulating film sleeve can also play a role of mechanical protection, preventing the PTC heating element from being damaged due to direct contact with the first clamping wall and the second clamping wall in the clamped state.

[0021] Furthermore, the mounting hole passes through the shell.

[0022] By adopting the above-mentioned technical solution, the PTC heating element can be conveniently placed in the mounting hole by passing the mounting hole through the shell, without adjusting the mounting orientation of the shell to cope with the wiring direction of the PTC heating element. At the same time, the mounting hole passing through the shell also further improves the heat dissipation efficiency of the PTC heating element after heating.

[0023] Furthermore, the outer bottom surface of the inner container includes a first curved surface, and the outer surface of the outer shell is provided with a second curved surface, the second curved surface is located between the first curved surface wall and the second curved surface wall, and the second curved surface is in contact with the first curved surface.

[0024] By adopting the above technical solution, the second curved surface on the PTC heater shell is fitted with the first curved surface of the outer bottom surface of the inner tank, thereby increasing the heat transfer area of ​​the PTC heater to the inner tank and improving the heat transfer efficiency of the PTC heater to the inner tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the structure of an electric kettle of the utility model;

[0027] Figure 2 This is a schematic diagram of the explosion of the inner tank structure;

[0028] Figure 3 Schematic diagram of the structure of the PTC heater (I);

[0029] Figure 4 This is a schematic diagram of the PTC heating element in the unclamped state;

[0030] Figure 5 This is a schematic diagram of the clamping state of the PTC heating element;

[0031] Figure 6 for Figure 5 A magnified schematic diagram;

[0032] Figure 7 It is the schematic diagram of the structure of the PTC heater (II);

[0033] Figure 8 Schematic diagram of the first curved wall and the second curved wall bending from inside to outside (I);

[0034] Fig. 9 Schematic diagram of the first curved wall and the second curved wall bending from inside to outside (II). DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0036] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0037] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0038] Embodiment 1:

[0039] like Figures 1 to 7As shown, the utility model provides an electric water kettle, comprising a kettle body, the kettle body comprising an inner liner 1, an outer bottom surface 11 of the inner liner 1 is provided with a PTC heater 2, the PTC heater 2 comprises a shell 21 and a PTC heating element 22, the shell 21 is provided with a mounting hole 211 for inserting and installing the PTC heating element 22, the shell 21 is provided with a first clamping wall 212, a second clamping wall 213 and a first curved wall 214, a second curved wall 215 on the periphery of the mounting hole 211, the first curved wall 214 and the second curved wall 215 are located between the first clamping wall 212 and the second clamping wall 213, the first curved wall 214 and the second curved wall 215 are bent and deformed, so that the first clamping wall 212 and the second clamping wall 213 are close to each other to clamp and fix the PTC heating element 22.

[0040] The utility model bends and deforms the first curved wall 214 and the second curved wall 215 so that the first clamping wall 212 and the second clamping wall 213 can cooperate with each other to clamp the PTC heating element 22, providing sufficient fastening force for clamping the PTC heating element 22 to prevent the PTC heating element 22 from loosening or falling off. The first clamping wall 212 and the second clamping wall 213 are close to each other to clamp and fix the PTC heating element 22, which not only improves the fixing reliability of the PTC heating element 22, but also makes the installation of the PTC heating element 22 simpler, improves the installation efficiency of the PTC heating element 22, and also facilitates the replacement of the PTC heating element 22 in the later stage. Moreover, the first clamping wall 212 and the second clamping wall 213 clamp and fix the PTC heating element 22, so that the extrusion force of the first clamping wall 212 and the second clamping wall 213 on the PTC heating element 22 is evenly distributed, which can prevent the PTC heating element 22 from being damaged by excessive local force.

[0041] The outer bottom surface 11 of the inner pot 1 can be a single-layer structure formed by stainless steel; in this embodiment, in order to make the heating effect of the liquid inside the inner pot 1 more uniform, such as Figure 2As shown, the bottom of the inner tank 1 adopts a double-layer structure. In addition to the outer bottom surface 11 of the inner tank 1, a heat-conducting cover 12 is additionally provided which is covered on the outer periphery of the outer bottom surface 11. The outer bottom surface 11 of the inner tank 1 does not directly contact the PTC heater 2. By covering the outer periphery of the outer bottom surface 11 with the heat-conducting cover 12 and arranging the PTC heater 2 on the outer surface of the heat-conducting cover 12, the PTC heater 2 can heat the liquid contained in the inner tank 1 more evenly. Specifically, the outer bottom surface 11 is usually made of thin-walled stainless steel, and the heat-conducting cover 12 is made of aluminum. Since the aluminum heat-conducting cover 12 has excellent thermal conductivity, the PTC heater 2 can more evenly disperse the generated heat energy to the entire heat-conducting cover 12 while being attached to the outer surface of the heat-conducting cover 12, and then transfer the heat energy evenly to the entire outer bottom surface 11 of the inner tank 1 through the entire heat-conducting cover 12, so as to evenly heat the liquid inside the inner tank, thereby improving the heating efficiency and thermal insulation effect of the inner tank 1.

[0042] In this embodiment, the first curved wall 214 and the second curved wall 215 are bent from outside to inside relative to the mounting hole 211. The first curved wall 214 and the second curved wall 215 are bent from outside to inside relative to the mounting hole 211, and the first clamping wall 212 and the second clamping wall 213 are pressed to make the first curved wall 214 deform inwardly. After deformation, it is not easy to rebound, so that the first clamping wall 212 and the second clamping wall 213 clamp the PTC heating element 22, and the first curved wall 21 After the first curved wall 214 and the second curved wall 215 are bent inward, they will fill the space in the mounting hole 211, reduce the air volume, and facilitate the heat transfer of the PTC heating element 22 to the housing, thereby improving the thermal efficiency. It can be understood that in other embodiments, the first curved wall 214 or the second curved wall 215 can be bent from the outside to the inside relative to the mounting hole 211, and the other curved wall can be bent from the inside to the outside, so that the first clamping wall 212 and the second clamping wall 213 can also clamp the PTC heating element 22.

[0043] Specifically, when the first clamping wall 212 and the second clamping wall 213 are pressed by an external force and move closer to each other, the first curved wall 214 and the second curved wall 215 bend and deform inward, and the first clamping wall 212 and the second clamping wall 213 gradually approach the PTC heating element 22 in the mounting hole 211 until they fit with the PTC heating element 22, thereby achieving fixed clamping of the PTC heating element 22.

[0044] In this embodiment, the thickness of the first curved wall 214 and the second curved wall 215 is 1.5 mm; if the thickness of the first curved wall 214 is less than 1.0 mm, the first curved wall 214 will be too thin, and it will be easily bent excessively and damaged when deformation occurs, thereby causing the first clamping wall 212 and the second supporting wall to lose the connection relationship, so that the PTC heating element 22 cannot be clamped; if the thickness of the first curved wall 214 is greater than 2.0 mm, the thickness of the first curved wall 214 will be too large, and when deformation occurs, the bent part will be Stress concentration and fatigue failure may occur due to excessive thickness, making it impossible to achieve long-term and reliable clamping of the PTC heating element 22; in order to avoid the same situation mentioned above, the second curved wall 215 also adopts the same value as the first curved wall 214; of course, in other embodiments, the thickness of the first curved wall 214 and the second curved wall 215 can also be 1.1mm, 1.3mm, 1.7mm, 1.9mm, etc., as long as the thickness is in the range of 1.0mm to 2.0mm, the above problems can be avoided.

[0045] In order to provide deformation space for the deformation of the first curved wall 214 and the second curved wall 215, after the PTC heating element 22 is placed in the mounting hole 211, a gap 216 is provided between the first curved wall 214 and the second curved wall 215. The gap 216 between the PTC heating element 22 and the first curved wall 214 and the second curved wall 215 provides the first curved wall 214 and the second curved wall 215 with the required deformation space for deformation, thereby facilitating the clamping of the PTC heating element 22 by the first clamping wall 212 and the second clamping wall 213, thereby preventing the PTC heating element from abutting against the first curved wall 214 and the second curved wall 215 and being damaged.

[0046] Among them, in order to increase the contact area between the PTC heating element 22 and the first clamping wall 212 and the second clamping wall 213, the inner surfaces 217 of the first clamping wall 212 and the second clamping wall 213 are planes. The inner surfaces 217 of the first clamping wall 212 and the second clamping wall 213 are planes, which can increase the contact area with the PTC heating element 22, so as to enhance the clamping effect of the first clamping wall 212 and the second clamping wall 213 on the PTC heating element 22. The PTC heating element 22 will also be subjected to more uniform force, will not be easily damaged during the installation and clamping process, and can also obtain long-term fixed reliability.

[0047] Since the position of the electrode plate 221 affects the electric field distribution and current density distribution of the PTC heating element 22, thereby affecting the heating effect of the entire PTC heating element 22, in the present embodiment, one of the electrode plates 221 of the PTC heating element 22 is located between the PTC heating element 22 and the first clamping wall 212, and the other electrode plate 221 is located between the PTC heating element 22 and the second clamping wall 213. By installing the two electrode plates 221 between the PTC heating element 22 and the first clamping wall 212 and between the PTC heating element 22 and the second clamping wall 213, respectively, the electric field and current density of the PTC heating element 22 can be more evenly distributed on the PTC heating element 22 when it is working, thereby improving the heating efficiency and performance; of course, in other embodiments, the two electrode plates 221 can also be arranged in the same direction.

[0048] Specifically, in order to avoid problems such as short circuit or leakage, the outer periphery of the PTC heating element 22 is provided with an insulating film sleeve 222 that separates the PTC heating element 22 from the outer shell 21. The insulating film sleeve 222 can separate the PTC heating element 22 from the outer shell 21 to avoid problems such as short circuit or leakage between the PTC heating element 22 and the external environment. The insulating film sleeve 222 can also play a role in mechanical protection to prevent the PTC heating element 22 from being damaged due to direct contact with the first clamping wall 212 and the second clamping wall 213 in a clamped state; wherein the insulating film sleeve 222 can be composed of insulating materials such as polyimide, polytetrafluoroethylene, and silicone rubber.

[0049] In this embodiment, the mounting hole 211 for installing the PTC heating component passes through the outer shell 21. By passing the mounting hole 211 through the outer shell 21, the PTC heating element 22 can be conveniently placed in the mounting hole 211 without adjusting the installation orientation of the outer shell 21 to cope with the wiring direction of the PTC heating element 22. At the same time, the mounting hole 211 passing through the outer shell 21 also further improves the heat dissipation efficiency of the PTC heating element 22 after heating.

[0050] In other embodiments, the mounting hole 211 may also be a one-way slot located on the outer shell 21, and the non-opening side thereof is set to the same specifications as the first curved wall 214 and the second curved wall 215, and is bent from the outside to the inside relative to the mounting hole 211 so that the first clamping wall 212 and the second clamping wall 213 can clamp the PTC heating element 22; at the same time, the thickness of this side should also be the same as the first curved wall 214 and the second curved wall 215.

[0051] In this embodiment, the electric kettle has a curved bottom surface, wherein the outer bottom surface 11 of the inner pot 1 includes a first curved surface 121 arranged on the outer surface of the heat-conducting cover 12, and the outer surface of the outer shell 21 is provided with a second curved surface 23 matching the first curved surface 121, and the second curved surface 23 is located between the first curved surface wall 214 and the second curved surface wall 215, and the second curved surface 23 is fitted with the first curved surface 121. The second curved surface 23 on the outer shell 21 of the PTC heater 2 is fitted with the first curved surface 121 on the outer surface of the heat-conducting cover 12, thereby increasing the heat transfer area of ​​the PTC heater 2 to the inner pot 1, so as to improve the heat transfer efficiency of the PTC heater 2 to the inner pot 1.

[0052] Of course, in other embodiments, since the bottom surface of the electric kettle is not an arc-shaped bottom surface, the outer surface of the shell 21 only needs to be provided with one side matching the shape of the bottom surface of the electric kettle, so that the PTC heater 2 fits tightly against the bottom surface of the electric kettle.

[0053] Embodiment 2:

[0054] like Figures 8 to 9 As shown, in the present embodiment, the first curved wall 214 and the second curved wall 215 are bent from the inside to the outside relative to the mounting hole 211. By bending the first curved wall 214 and the second curved wall 215 from the inside to the outside relative to the mounting hole 211, the effectively utilized space in the mounting hole 211 will not be occupied. Under the condition of the same material, a PTC heating element 22 with a larger volume and power can be placed, thereby saving production costs. Of course, in other embodiments, the first curved wall 214 or the second curved wall 215 can also be separately arranged to bend from the inside to the outside relative to the mounting hole 211, and the other curved wall can be bent from the outside to the inside relative to the mounting hole 211, which can also achieve the above-mentioned effect of clamping the PTC heating element 22.

[0055] For the contents not described in the second embodiment, please refer to the first embodiment.

[0056] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. An electric kettle, comprising a kettle body, the kettle body comprising an inner liner, a PTC heater is provided on the outer bottom surface of the inner liner, the PTC heater comprises a shell and a PTC heating element, the shell is provided with a mounting hole for inserting and installing the PTC heating element, characterized in that: The shell is provided with a relative first clamping wall, a second clamping wall and a relative first curved wall, a second curved wall on the outer periphery of the mounting hole. The first curved wall and the second curved wall are located between the first clamping wall and the second clamping wall. The first curved wall and the second curved wall are bent and deformed so that the first clamping wall and the second clamping wall are close to each other to clamp and fix the PTC heating element.

2. The electric kettle according to claim 1, characterized in that: The first curved wall and / or the second curved wall is bent from outside to inside relative to the mounting hole.

3. The electric kettle according to claim 1, characterized in that: The first curved wall and / or the second curved wall are bent from inside to outside relative to the mounting hole.

4. The electric kettle according to claim 1, characterized in that: The thickness of the first curved wall and / or the second curved wall is 1.0 mm to 2.0 mm.

5. The electric kettle according to claim 1, characterized in that: There is a gap between the PTC heating element and the first curved wall and the second curved wall.

6. The electric kettle according to claim 1, characterized in that: The inner surfaces of the first clamping wall and the second clamping wall are planes.

7. The electric kettle according to claim 1, characterized in that: The PTC heating element is provided with two electrode plates, one of which is located between the PTC heating element and the first clamping wall, and the other is located between the PTC heating element and the second clamping wall.

8. The electric kettle according to claim 1, characterized in that: An insulating film sleeve is arranged on the periphery of the PTC heating element to separate the PTC heating element from the housing.

9. The electric kettle according to claim 1, characterized in that: The mounting hole passes through the housing.

10. The electric kettle according to claim 1, characterized in that: The outer bottom surface of the inner container includes a first curved surface, and the outer surface of the outer shell is provided with a second curved surface, the second curved surface is located between the first curved surface wall and the second curved surface wall, and the second curved surface is in contact with the first curved surface.

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