Liquid heater

Abstract

The liquid heater comprises an inner container, a coupler, a heating pipe and a PTC heater are arranged at the bottom of the inner container, an arc-shaped wall extending upwards is arranged at the bottom of the inner container, the heating pipe is arranged on the arc-shaped wall in a winding mode, the two ends of the heating pipe are arranged in an up-down staggered mode, and the coupler is located on the inner ring of the heating pipe. The heating pipe is provided with a first pipe section close to the coupler and a second pipe section away from the coupler, an installation avoiding area is formed between the coupler and the second pipe section, and the PTC heater is arranged in the installation avoiding area and is close to the staggered position of the two ends of the heating pipe. Due to the arrangement of the heating pipe, heat can be more evenly distributed on the inner container, a local high-temperature area caused by linear arrangement of a traditional C-shaped heating pipe is avoided, and the liquid heating uniformity is improved. The PTC heater is located in the installation avoiding area between the coupler and the heating pipe, so that more sufficient space is provided for installation and maintenance of the PTC heater, the installation difficulty is reduced, and the safety distance is easier to guarantee.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of household appliances, and particularly relates to a liquid heater. BACKGROUND

[0002] The bottom of the kettle body of the existing liquid heater generally adopts a plane structure. However, in the process of heating and boiling water, small steam bubbles attached to the bottom wall of the kettle body are prone to detach and break, thereby generating a large noise and reducing the user experience. Therefore, more and more liquid heaters select a spherical inner container to solve the noise problem. The inner surface of the bottom wall of the inner container includes a spherical surface, and a heating element is arranged on the spherical surface. The steam bubbles are caused to slide along the slope surface from the bottom to the top by using the buoyancy of the steam bubbles and the adhesion of the slope surface, and then the small steam bubbles on the slope surface are caused to coalesce into large steam bubbles, thereby reducing the probability of the small steam bubbles detaching from the bottom wall of the inner container and entering the water to break. The coalesced large steam bubbles are difficult to break in the water after detaching from the bottom wall of the inner container, and the problem of small and dense local steam bubbles can be solved, thereby achieving a significant noise reduction effect.

[0003] However, the spherical inner container of the existing liquid heater is generally heated by a C-shaped heating pipe attached to the bottom wall. That is, the heating pipe is arranged in a C shape along the lower part of the spherical inner container. This arrangement mode causes the attachment area of the heating pipe on the spherical inner container to be small, the heating power is small (1500W-1800W), the heating time is long, the waiting time of the user is increased, and the user experience is reduced.

[0004] For example, the patent document CN207341609U discloses a liquid heater including a kettle body, a temperature controller, a heating pipe, and a PTC heater arranged at the bottom of the kettle body. The temperature controller is arranged on the inner side of the heating pipe, the heating pipe is in a C shape, an installation area is formed between the two joints of the heating pipe, and the PTC heater is arranged in the installation area. This technical solution is expected to improve the heating power by additionally arranging the PTC heater. However, the distribution mode of the heating pipe causes the heat to be unevenly distributed in the kettle body, thereby affecting the uniformity of the liquid heating and the heating efficiency. Moreover, although the C-shaped heating pipe forms an installation area between the two joints, the installation area is relatively narrow, which increases the installation and maintenance difficulty of the PTC heater, and the safety distance is not easy to guarantee. If the installation area is expanded by reducing the circumference of the heating pipe, the heating efficiency will be further reduced. The limited installation area causes the distance between the heating pipe and the PTC heater to be too close, thereby causing the local overheating of the area. In the cooking program such as stewing, the bottom burning phenomenon is prone to occur at the position opposite to the area in the kettle body, thereby affecting the cooking effect of the food material. UTILITY MODEL CONTENT

[0005] This application provides a liquid heater to solve the technical problems of low heating efficiency and uneven heating caused by improper distribution of heating elements in existing liquid heaters with spherical bottoms, which make it difficult to achieve the expected heating efficiency.

[0006] The technical solution adopted in this application is as follows:

[0007] A liquid heater includes an inner tank. A coupler, a heating element, and a PTC heater are disposed at the bottom of the inner tank. The bottom of the inner tank has an upwardly extending arc-shaped wall. The heating element is wound around the arc-shaped wall with its two ends arranged alternately. The coupler is located within the inner ring of the heating element. The heating element has a first section close to the coupler and a second section away from the coupler. An installation clearance area is formed between the coupler and the second section. The PTC heater is disposed within the installation clearance area and at an alternate position adjacent to the two ends of the heating element.

[0008] In this application, the heating element is wound around the arc-shaped wall with its two ends staggered, which helps to distribute heat more evenly on the inner liner, avoiding localized high-temperature zones caused by the linear arrangement of traditional C-type heating elements, and improving the uniformity of liquid heating. Combined with the physical flow guiding effect of the arc-shaped wall, the liquid is heated more evenly, reducing the probability of scorching. By rationalizing the winding method of the heating element on the arc-shaped wall, it also helps to improve heating efficiency, reduce cooking waiting time, and improve the user experience. The coupler is located on the inner ring of the heating element, and the PTC heater is located in the installation clearance area between the coupler and the second tube section. This layout provides more space for the installation and maintenance of the PTC heater, reduces installation difficulty, and makes it easier to ensure safety distances. Moreover, the arc-shaped wall design makes the overall structure more compact, providing a reasonable space allocation for the layout of the heating element and PTC heater, and improving space utilization. During operation, the first tube section closest to the coupler quickly transfers heat to the central area at the bottom of the inner pot, while the second tube section furthest from the coupler rapidly diffuses heat to other areas of the curved wall, achieving uniform heat distribution in a short time. An installation clearance zone is formed between the second tube section and the coupler, providing ample space for the installation and maintenance of the PTC heater, reducing interference and difficulties during installation. It also avoids localized overheating caused by the heating element and PTC heater being too close together, which is especially important in stewing and simmering cooking programs (such as brewing herbal teas, health-preserving soups, and red bean porridge), reducing the occurrence of scorching and improving cooking results.

[0009] The PTC heater in this application possesses characteristics that enable automatic temperature control during heating. Combined with the layout of the heating element, it allows for more efficient utilization of thermal energy and improved heating efficiency. By rationally arranging the heating element and PTC heater, the problem of localized overheating caused by their close proximity is avoided, reducing the risk of scorching during stewing and simmering processes, thus improving cooking results and safety. Furthermore, the staggered positions of the PTC heater and the heating element at both ends create complementary heating zones, further stabilizing the temperature field. Moreover, the staggered positions of the heating element ends maintain safe electrical clearances, ensuring compliance with safety regulations and preventing interference during wiring and fixing at both ends of the heating element.

[0010] The heating element extends spirally from the bottom of the arc-shaped wall to the top of the arc-shaped wall.

[0011] The extension method and coverage area of ​​the heating element on the curved wall directly affect the heating uniformity and heating power of the inner tank. This technical solution combines the curved wall design at the bottom of the inner tank with the spiral extension of the heating element, allowing the heating element to better conform to the shape of the inner tank bottom, covering a larger area, and resulting in more even heat distribution and improved heating uniformity. Within the limited space at the bottom of the inner tank, the spiral extension of the heating element from bottom to top maximizes the heating area, making full use of space and improving the heating performance of the liquid heater. Furthermore, compared to C-shaped heating elements, the spiral extension generates rotation and eddies during water heating, disrupting the dispersed distribution of small bubbles during boiling. This allows more small bubbles to coalesce into larger bubbles, reducing the probability of small bubbles detaching from the inner tank bottom wall and bursting in the water. The larger bubbles that do detach from the inner tank bottom wall are less likely to burst in the water, thus significantly improving noise during boiling.

[0012] The end of the first pipe segment extends downward at an angle, and the end of the second pipe segment extends upward at an angle, so that the stagger distance between the two gradually increases from the side adjacent to the PTC heater to the side away from the PTC heater.

[0013] In this technical solution, the inclined extension of the first and second pipe sections allows for a more compact layout of the heating element, fully utilizing the space at the bottom of the inner liner. Combined with the arc-shaped wall design at the bottom of the inner liner, the heating element can better conform to the shape of the inner liner's bottom, further optimizing space utilization. Furthermore, combined with the automatic temperature control characteristics of the PTC heater, it can utilize heat energy more efficiently, improving heating efficiency. Moreover, the inclined extension of the first and second pipe sections causes the staggered distance between them to gradually increase from the side adjacent to the PTC heater to the side farther away from the PTC heater. This ensures a more uniform heat distribution at the bottom of the inner liner, reducing temperature gradients. On the other hand, the increased staggered distance ensures the safety distance between the PTC heater and the heating element, reducing safety hazards.

[0014] The bottom of the inner liner is provided with a heat-conducting plate, which at least covers the arc-shaped wall. The heating element and the PTC heater are both located on the heat-conducting plate.

[0015] This technical solution, by adding a heat-conducting plate, can quickly and evenly conduct heat, allowing the heat generated by the heating element and PTC to be more evenly distributed across the entire bottom of the inner tank, avoiding localized overheating and improving the uniformity of liquid heating. Furthermore, the heat-conducting plate, as a unified substrate, simplifies the installation process of the heating element and PTC heater, improving assembly efficiency.

[0016] The heat-conducting plate is annular to form an opening that avoids the coupler. One end of the heating tube extends upward to approach the outer periphery of the heat-conducting plate, and the other end extends downward to approach the inner periphery of the heat-conducting plate.

[0017] In this technical solution, the annular design of the heat-conducting plate serves two purposes. First, it creates an opening that avoids the coupler, allowing the temperature sensing element in the coupler to directly contact the bottom of the inner pot for anti-dry-burning detection. Second, the annular heat-conducting pipe design prevents direct heat transfer between the heating element and the PTC from reaching the central area of ​​the inner pot's bottom, thus avoiding overheating at the bottom center, reducing scorching, and improving cooking results. With one end of the heating element near the outer periphery of the heat-conducting plate and the other near the inner periphery, the heating element achieves large-area coverage of the curved wall, further enhancing heating efficiency.

[0018] The heating element and the PTC heater are connected in series, and the liquid heater operates at a first heating power.

[0019] Existing liquid heaters with spherical inner tanks generally suffer from low heating efficiency. This technical solution connects the heating element and the PTC heater in series, enabling synergistic heating and increasing heating power. Furthermore, combined with the PTC heater's inherent automatic temperature control characteristics, it automatically adjusts its power after reaching a certain temperature, ensuring a more stable and efficient heating process. The two work together to maintain the heating temperature within a stable range, avoiding significant temperature fluctuations.

[0020] The heating element and the PTC heater are connected in parallel, and the liquid heater operates at a second heating power, a third heating power, or a fourth heating power.

[0021] In this technical solution, the heating element and the PTC heater are connected in parallel. This parallel connection allows the heating element and the PTC heater to work independently or simultaneously, thereby enabling various heating powers to meet the heating needs of different cooking programs. This expands the functional scope of the liquid heater and enhances the user experience.

[0022] The wiring terminals of the PTC heater are oriented towards the staggered positions of the two ends of the heating element.

[0023] This technical solution arranges the terminals of the PTC heater towards the staggered positions of the two ends of the heating element, allowing the leads electrically connected to the PTC heater terminals to be led out through the staggered positions. This avoids the drawback of having to run the PTC heater leads around the heating element radially to lead them out. On the one hand, this technical solution guides and limits the leads through the staggered positions of the two ends of the heating element, preventing tangled wires. On the other hand, it reduces the impact of the heating element on the temperature rise of the leads, extending the service life of the leads.

[0024] The staggered distance L between the two ends of the heating element satisfies: 5mm≤L≤7mm.

[0025] The staggered distance between the two ends of the heating element not only affects heat distribution but also safety performance. This technical solution preferably sets the staggered distance between the two ends of the heating element to be no less than 5mm and no more than 7mm. This ensures a more uniform heat distribution, preventing the heating elements from being too densely packed or too dispersed, allowing heat to be evenly transferred to the bottom of the inner liner, reducing the temperature gradient at the bottom of the inner liner, and preventing localized overheating or cooling. Furthermore, it ensures that the distance between the two ends of the heating element meets safety standards, reducing potential safety hazards.

[0026] The heating element is connected to an external power source via a terminal block. The height distance H between the terminal block at one end of the heating element and the terminal block at the other end of the heating element satisfies the following condition: 20mm ≤ H ≤ 23mm.

[0027] The height distance between the terminals at both ends of the heating element actually reflects the distribution range of the heating element on the curved wall. This technical solution limits the height distance between the terminals at both ends of the heating element to no less than 20mm and no more than 23mm. This not only makes full use of the preferential space of the curved wall, allowing the heating element to be arranged more compactly at the bottom of the inner liner, increasing the coverage area of ​​the heating element at the bottom of the inner liner, thereby improving the uniformity and efficiency of heating, but also ensures the safety distance between the two ends of the heating element, making it meet safety standards and reducing safety hazards. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a perspective view of a liquid heater according to one embodiment of this application;

[0030] Figure 2 This is a cross-sectional view of a liquid heater according to one embodiment of this application;

[0031] Figure 3 This is a perspective view of the assembly of the inner liner, heating element, PTC heater and coupler according to one embodiment of this application;

[0032] Figure 4 This is a front view of the inner liner, heating element, PTC heater and coupler assembled according to one embodiment of this application;

[0033] Figure 5 This is a top view of the inner liner, heating element, PTC heater and coupler assembled according to one embodiment of this application.

[0034] in,

[0035] 1. Inner liner; 11. Arc-shaped wall;

[0036] 2. Coupler;

[0037] 3. PTC heater; 31. Wiring terminal;

[0038] 4. Heating element; 41. First tube section; 42. Second tube section; 43. Terminal;

[0039] 5. Heat-conducting plate;

[0040] 6. Outer shell. Detailed Implementation

[0041] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0042] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0043] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0046] like Figures 1 to 3As shown, a liquid heater includes an inner tank 1. The bottom of the inner tank 1 is provided with a coupler 2, a heating element 4, and a PTC heater 3. The bottom of the inner tank 1 is provided with an upwardly extending arc-shaped wall 11. The heating element 4 is wound around the arc-shaped wall 11 and the two ends of the heating element 4 are arranged alternately. The coupler 2 is located in the inner ring of the heating element 4. The heating element 4 has a first pipe section 41 close to the coupler 2 and a second pipe section 42 away from the coupler 2. An installation clearance area is formed between the coupler 2 and the second pipe section 42. The PTC heater 3 is located in the installation clearance area and is located at the staggered position adjacent to the two ends of the heating element 4.

[0047] The liquid heater in this application can be a kettle, a food processor, or a soy milk maker, etc. The liquid heater also includes a shell 6 surrounding the inner pot 1.

[0048] In this application, the heating element 4 is wound around the arc-shaped wall 11, with its two ends staggered. This helps to distribute heat more evenly on the inner liner 1, avoiding localized high-temperature zones caused by the linear arrangement of traditional C-type heating elements, and improving the uniformity of liquid heating. Combined with the physical flow guiding effect of the arc-shaped wall 11, the liquid is heated more evenly, reducing the probability of scorching. By rationalizing the winding method of the heating element 4 on the arc-shaped wall 11, it also helps to improve heating efficiency, reduce cooking waiting time, and enhance the user experience. The coupler 2 is located on the inner ring of the heating element 4, and the PTC heater 3 is located in the installation clearance area between the coupler 2 and the second pipe section 42. This layout provides more space for the installation and maintenance of the PTC heater 3, reduces installation difficulty, and makes it easier to ensure safety distances. Moreover, the design of the arc-shaped wall 11 makes the overall structure more compact, providing a reasonable space allocation for the layout of the heating element 4 and the PTC heater 3, and improving space utilization. During operation, the first pipe section 41, which is closer to the coupler 2, can quickly transfer heat to the central area at the bottom of the inner pot 1, while the second pipe section 42, which is farther from the coupler 2, can quickly diffuse heat to other areas of the arc-shaped wall 11, thus achieving uniform heat distribution in a short time. An installation clearance area is formed between the second pipe section 42 and the coupler 2, providing ample space for the installation and maintenance of the PTC heater 3, reducing interference and difficulties during installation, and preventing localized overheating caused by the heating element 4 and the PTC heater 3 being too close. This is especially important in stewing and simmering cooking programs (such as brewing herbal tea, health-preserving soup, red bean soup, etc.), as it can reduce the occurrence of scorching and improve cooking results.

[0049] The characteristics of the PTC heater 3 in this application enable it to automatically maintain a constant temperature during the heating process. Combined with the layout of the heating element 4, it can utilize heat energy more effectively and improve heating efficiency. By rationally arranging the heating element 4 and the PTC heater 3, the problem of localized overheating caused by their close proximity is avoided, reducing the risk of scorching during stewing and simmering cooking processes, and improving cooking results and safety. In addition, the staggered positions of the PTC heater 3 and the heating element 4 at both ends create complementary heating zones, further stabilizing the temperature field. Moreover, the staggered positions of the two ends of the heating element 4 maintain a safe electrical clearance, ensuring compliance with safety regulations and preventing interference during wiring and fixing at both ends of the heating element 4.

[0050] In this application, the heating element can extend on the arc-shaped wall in any of the following embodiments:

[0051] Implementation Method 1: This implementation method is not illustrated. In this implementation method, the heating element extends in a meandering manner from the bottom of the arc-shaped wall to the top of the arc-shaped wall. The meandering extension method can be designed to match the curvature and size of the arc-shaped wall 11 at the bottom of the inner liner 1. By extending in a meandering, irregular path, the coverage area of ​​the heating element on the arc-shaped wall can be maximized, thereby improving the uniformity and efficiency of heating.

[0052] Implementation Method Two: (e.g.) Figures 3 to 5 As shown, the heating element 4 extends spirally from the bottom of the arc-shaped wall 11 to the top of the arc-shaped wall 11.

[0053] The extension pattern and coverage area of ​​the heating element 4 on the arc-shaped wall 11 directly affect the heating uniformity and heating power of the inner liner 1. In this embodiment, the arc-shaped wall 11 at the bottom of the inner liner 1, combined with the spiral extension of the heating element 4 on the arc-shaped wall 11, allows the heating element 4 to better fit the shape of the bottom of the inner liner 1, covering a larger area and enabling more uniform heat distribution, thus improving heating uniformity. Within the limited space at the bottom of the inner liner 1, the spiral extension of the heating element 4 from bottom to top maximizes the heating area, making full use of the space and improving the heating performance of the liquid heater. Furthermore, compared to a C-shaped heating element, the spiral extension of the heating element 4 generates rotation and eddies during water heating, disrupting the dispersed distribution of small bubbles during boiling. This allows more small bubbles to aggregate into larger bubbles, reducing the probability of small bubbles detaching from the bottom wall of the inner liner 1 and bursting in the water. The larger bubbles formed after detaching from the bottom wall of the inner liner 1 are less likely to burst in the water, thus significantly improving noise during boiling.

[0054] In this embodiment, the heating element can be extended in any of the following embodiments:

[0055] Example 1: This example 1 is not illustrated. In this example 1, the end of the first pipe segment and the parallel arrangement of the second pipe segment are arranged so that the staggered distance between them remains equal from the side adjacent to the PTC heater to the side away from the PTC heater.

[0056] Example 2: Figure 3 and Figure 4 As shown, the end of the first pipe segment 41 extends downward at an angle, and the end of the second pipe segment 42 extends upward at an angle, so that the staggered distance between them gradually increases from the side adjacent to the PTC heater 3 to the side away from the PTC heater 3. In this embodiment 2, the inclined extension of the first pipe segment 41 and the second pipe segment 42 makes the layout of the entire heating element 4 more compact, making full use of the space at the bottom of the inner liner 1. Combined with the arc-shaped wall 11 design at the bottom of the inner liner 1, the heating element 4 can better fit the shape of the bottom of the inner liner 1, further optimizing space utilization. Furthermore, combined with the automatic temperature control characteristics of the PTC heater 3, it can utilize heat energy more efficiently and improve heating efficiency. Moreover, the inclined extension of the first pipe segment 41 and the second pipe segment 42 makes the staggered distance between them gradually increase from the side adjacent to the PTC heater 3 to the side away from the PTC heater 3. On the one hand, it can ensure a more uniform distribution of heat at the bottom of the inner liner 1 and reduce the temperature gradient. On the other hand, the increased staggered distance can ensure the safety distance between the PTC heater 3 and the heating element 4, reducing safety hazards.

[0057] In this application, the heating element and PTC heater can be installed at the bottom of the inner tank in any of the following embodiments:

[0058] Implementation Method 3: This implementation method is not illustrated. In this implementation method, the heating element and the PTC heater are directly installed on the arc-shaped wall to achieve direct heat conduction to the arc-shaped wall.

[0059] Implementation Method Four: (e.g.) Figure 2 As shown, a heat-conducting plate 5 is provided at the bottom of the inner liner 1, and the heat-conducting plate 5 at least covers the arc-shaped wall 11. The heating element 4 and the PTC heater 3 are both located on the heat-conducting plate 5. In this fourth embodiment, by adding the heat-conducting plate 5, indirect heat conduction is achieved. The heat-conducting plate 5 can conduct heat quickly and evenly, so that the heat generated by the heating element 4 and the PTC heater can be more evenly distributed throughout the bottom of the inner liner 1, avoiding local overheating and improving the uniformity of liquid heating. Moreover, as a unified substrate, the heat-conducting plate 5 can simplify the installation process of the heating element 4 and the PTC heater 3 and improve assembly efficiency.

[0060] As a preferred embodiment of this fourth implementation method, such as Figure 2 and Figure 3As shown, the heat-conducting plate 5 is annular to form an opening that avoids the coupler 2. One end of the heating tube 4 extends upward to near the outer periphery of the heat-conducting plate 5, and the other end extends downward to near the inner periphery of the heat-conducting plate 5. In this embodiment, the annular design of the heat-conducting plate 5 can, on the one hand, form an opening that avoids the coupler 2, allowing the temperature sensing element in the coupler 2 to directly contact the bottom of the inner pot 1 for anti-dry-burning detection. Moreover, the annular heat-conducting tube design allows the direct heat transfer between the heating tube 4 and the PTC heater 3 to avoid the central area of ​​the bottom of the inner pot 1, thereby avoiding the problem of overheating at the bottom center of the inner pot 1, reducing the occurrence of scorching, and improving the cooking effect of the food. With one end of the heating tube 4 near the outer periphery of the heat-conducting plate 5 and the other end near the inner periphery of the heat-conducting plate 5, the heating tube 4 achieves a large area coverage of the arc-shaped wall 11, further improving the heating efficiency.

[0061] Furthermore, the outer periphery of the heat-conducting plate 5 extends upward and outward to approach the top of the arc-shaped wall 11, thereby expanding the coverage area of ​​the heat-conducting plate 5 over the arc-shaped wall 11 and further improving the heat transfer effect.

[0062] In this embodiment, there are no limitations on the fixing method of the heating tube 4 and the heat-conducting plate 5, or the fixing method of the PTC heater 3 and the heat-conducting plate 5. Preferably, the heating tube 4 and the PTC heater 3 are both welded and fixed to the side of the heat-conducting plate 5 facing away from the inner liner 1.

[0063] The connection between the heating element 4 and the PTC heater 3 in this application can be any of the following embodiments:

[0064] Implementation Method 5: The heating element 4 and the PTC heater 3 are connected in series, and the liquid heater operates at the first heating power. Existing liquid heaters with a spherical inner liner 1 generally suffer from low heating efficiency. This technical solution connects the heating element 4 and the PTC heater 3 in series, achieving synergistic heating and increasing the heating power. Furthermore, combined with the automatic temperature control characteristics of the PTC heater 3, it can automatically adjust its power after reaching a certain temperature, ensuring a more stable and efficient heating process. The two work together to keep the heating temperature within a stable range, avoiding large temperature fluctuations.

[0065] Implementation Method Six: The heating element 4 and the PTC heater 3 are connected in parallel, and the liquid heater operates at a second, third, or fourth heating power. In this implementation method six, the heating element 4 and the PTC heater 3 are connected in parallel. This parallel connection allows the heating element 4 and the PTC heater 3 to operate independently or simultaneously, thereby achieving multiple heating power levels to meet the heating needs of different cooking programs. This expands the functional scope of the liquid heater and enhances the user experience.

[0066] This application does not limit the orientation of the PTC heater terminals, and they can adopt any of the following embodiments:

[0067] Implementation Method Seven: This implementation method seven is not illustrated. In this implementation method seven, the wiring terminals of the PTC heater are opposite to the staggered positions of the two ends of the heating element.

[0068] Implementation method eight: such as Figures 3 to 5 As shown, the terminals 31 of the PTC heater 3 face the staggered positions of the two ends of the heating element 4. This embodiment, by staggering the terminals 31 of the PTC heater 3 facing the two ends of the heating element 4, allows the leads electrically connected to the terminals 31 of the PTC heater 3 to be led out through the staggered positions. This avoids the drawback of having to route the leads of the PTC heater 3 around the heating element 4 radially to lead them out. This technical solution, on the one hand, guides and limits the leads through the staggered positions of the two ends of the heating element 4, preventing tangled wires; on the other hand, it reduces the impact of the heating element 4 on the temperature rise of the leads, extending the service life of the leads.

[0069] As a preferred embodiment of this application, such as Figure 4 As shown, the staggered distance L between the two ends of the heating element 4 satisfies: 5mm ≤ L ≤ 7mm. In this embodiment, the staggered distance between the two ends of the heating element 4 refers to the distance between the tangents in the extending directions of the two ends of the heating element 4. The staggered distance between the two ends of the heating element 4 not only affects the heat distribution but also the safety performance. In this embodiment, it is preferable to set the staggered distance between the two ends of the heating element 4 to be no less than 5mm and no more than 7mm. On the one hand, this ensures a more uniform heat distribution from the heating element 4, avoiding the heating element 4 being too dense or too scattered, allowing heat to be evenly transferred at the bottom of the inner liner 1, reducing the temperature gradient at the bottom of the inner liner 1, and avoiding local overcooling or overheating. On the other hand, it ensures the safety distance between the two ends of the heating element 4, making it meet safety standards and reducing safety hazards.

[0070] As a preferred embodiment of this application, such as Figure 4As shown, the heating element 4 is connected to an external power source via terminals 43. The height distance H between terminals 43 at one end of the heating element 4 and terminals 43 at the other end of the heating element 4 satisfies the condition: 20mm ≤ H ≤ 23mm. The height distance between terminals 43 at both ends of the heating element 4 actually reflects the distribution range of the heating element 4 on the arc-shaped wall 11. In this embodiment, by limiting the height distance between terminals 43 at both ends of the heating element 4 to not less than 20mm and not more than 23mm, the preferred space of the arc-shaped wall 11 can be fully utilized, allowing the heating element 4 to be arranged more compactly at the bottom of the inner liner 1, increasing the coverage area of ​​the heating element 4 at the bottom of the inner liner 1, thereby improving the uniformity and efficiency of heating. Moreover, it can also ensure the safety distance between the two ends of the heating element 4, making it meet safety standards and reducing safety hazards.

[0071] Furthermore, such as Figure 5 As shown, the distance M between the horizontal projection of the terminal 43 at one end of the heating element 4 and the horizontal projection of the terminal 43 at the other end of the heating element 4 satisfies: 18mm≤M≤22mm. This setting not only improves safety while meeting safety regulations, but also meets installation space requirements, facilitating the connection of the external power supply lead of the heating element 4, and also facilitating the installation and fixing of the heating element 4.

[0072] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0073] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0074] The above descriptions are merely embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A liquid heater comprising an inner container, the bottom of the inner container is provided with a coupler, a heating tube and a PTC heater, characterized in that, The inner container is provided with an upwardly extending arc-shaped wall, the heating tube is arranged around the arc-shaped wall, and the two ends of the heating tube are arranged staggeredly up and down, the coupler is located in the inner ring of the heating tube, the heating tube has a first tube segment close to the coupler and a second tube segment away from the coupler, an installation avoiding area is formed between the coupler and the second tube segment, and the PTC heater is arranged in the installation avoiding area and adjacent to the staggered position of the two ends of the heating tube.

2. The liquid heater according to claim 1, wherein The heating tube extends spirally from the bottom of the arc-shaped wall to the upper part of the arc-shaped wall.

3. The liquid heater according to claim 2, wherein The end of the first tube segment extends downwardly and obliquely, and the end of the second tube segment extends upwardly and obliquely, so that the staggered distance between the two gradually increases from the side adjacent to the PTC heater to the side away from the PTC heater.

4. The liquid heater according to claim 1, wherein The bottom of the inner container is provided with a heat-conducting plate, the heat-conducting plate covers at least the arc-shaped wall, and the heating tube and the PTC heater are arranged on the heat-conducting plate.

5. The liquid heater according to claim 4, wherein The heat-conducting plate is annular to form a through opening avoiding the coupler, one end of the heating tube extends upwardly to be close to the outer periphery of the heat-conducting plate, and the other end extends downwardly to be close to the inner periphery of the heat-conducting plate.

6. The liquid heater according to claim 1, wherein The heating tube and the PTC heater are connected in series with each other, and the liquid heater works at a first heating power.

7. The liquid heater according to claim 1, wherein The heating tube and the PTC heater are connected in parallel with each other, and the liquid heater works at a second heating power, a third heating power or a fourth heating power.

8. The liquid heater according to claim 1, wherein The wiring terminal of the PTC heater is directed toward the staggered position of the two ends of the heating tube.

9. The liquid heater according to claim 1, wherein The staggered distance L between the two ends of the heating tube satisfies 5mm≤L≤7mm.

10. The liquid heater according to claim 1, wherein The heating tube is connected to an external power source through a terminal post, and the height distance H between the terminal post at one end of the heating tube and the terminal post at the other end of the heating tube satisfies 20mm≤H≤23mm.

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