Liquid heater

Abstract

The liquid heater comprises a glass cup body, a handle installed on one side of the glass cup body and a detection plate located between the glass cup body and the handle, the handle comprises a handle base and a holding part connected with the handle base, the side, facing the detection plate, of the handle base is coated with a shielding layer, and the shielding layer is grounded. A plurality of capacitor pole pieces are arranged on the detection plate, and the projection of the shielding layer in the radial direction of the glass cup body covers the capacitor pole pieces. Compared with the prior art that a grounding shielding layer is attached to the back surface of the detection plate, so that the thickness of the detection plate is increased, and a series of defects are caused, the shielding layer is arranged on the handle seat; the problems that signal transmission is delayed, the transmission speed is reduced, the anti-overflow detection precision is reduced, the detection plate is difficult to install, and the detection plate cannot be effectively attached to the glass cup body due to increase of the thickness of the detection plate are effectively avoided.

Description

Technical Field

[0001] This application belongs to the field of household appliance technology, specifically relating to a liquid heater. Background Technology

[0002] Existing liquid heaters, taking health-preserving kettles as an example, typically install a sensor on the side of the anti-overflow detection plate that is in close contact with the glass kettle body to achieve anti-overflow cooking. Electronic circuitry is also mounted on the side of the anti-overflow detection plate that faces away from the glass kettle body. At the same time, to prevent interference signals from the side of the anti-overflow detection plate that faces away from the glass kettle body from penetrating, such as when a person's hand approaches from behind the anti-overflow detection plate, interference signals will affect the anti-overflow detection signal, thus causing false overflow and affecting cooking efficiency. Existing technology generally adds a grounding shielding layer to the back of the anti-overflow detection plate to provide a certain degree of shielding against external signals.

[0003] The principle of the grounding shield is as follows: When an external electrostatic field exists, the grounding shield induces charges opposite to the electrostatic field. These charges are distributed across the entire surface of the shield. Since the shield is a conductor and grounded, its internal electric field strength is zero, thus isolating the internal anti-overflow detection plate from the external electrostatic field and preventing interference from the electrostatic field. When an external alternating electric field exists, the grounding shield can provide a low-impedance return path. When the alternating electric field attempts to couple to the anti-overflow detection plate through space, the interference current will preferentially flow through the shield to the ground, rather than through the anti-overflow detection plate, thereby reducing the interference voltage experienced by the anti-overflow detection plate. By setting a grounding shield, the influence of external interference signals on the anti-overflow detection circuit can be blocked, improving the accuracy and reliability of the anti-overflow detection, thus ensuring the brewing efficiency and safety of the health pot.

[0004] Existing grounding shielding layers typically consist of a metal plate or foil, such as copper or aluminum foil, mounted on the back of the spill detection board. One side of the metal plate or foil is connected to ground, providing shielding. However, this method of mounting a grounding shielding layer on the spill detection board increases its thickness. Existing spill detection boards generally come in two types: rigid PCBs and flexible PCBs. For rigid PCBs, increased thickness leads to a longer signal transmission path, resulting in increased signal delay and affecting signal transmission timeliness. Furthermore, a thicker rigid PCB increases interlayer capacitance, impacting signal transmission speed and stability. Additionally, increased thickness makes the detection board bulky, hindering installation. In environments with significant temperature variations, differences in thermal expansion coefficients can cause stress that deforms the rigid PCB, affecting the accuracy of the spill detection signal. For flexible PCBs, increased thickness increases the minimum bending radius and reduces bending capacity, making them unsuitable for the curved structure of the glass container. This leads to installation difficulties or inability to achieve a tight fit, further affecting the accuracy of spill detection. Furthermore, increasing the thickness of the flexible PCB board will increase the mechanical stress generated inside the test board when it is bent. After long-term use, the flexible PCB board is prone to cracks or damage, affecting its reliability and service life. Utility Model Content

[0005] This application provides a liquid heater to solve the technical problems of signal transmission delay, reduced detection accuracy, and difficulty in installing the detection board caused by attaching a grounding shielding layer to the back of the detection board in existing liquid heaters, which increases the thickness of the detection board.

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

[0007] A liquid heater includes a glass body, a handle mounted on one side of the glass body, and a detection plate located between the glass body and the handle. The handle includes a handle base and a grip portion connected to the handle base. The side of the handle base facing the detection plate is coated with a shielding layer, which is grounded. The detection plate is provided with a plurality of capacitor plates, and the projection of the shielding layer along the radial direction of the glass body covers the capacitor plates.

[0008] Compared to the existing technology that uses a grounding shielding layer attached to the back of the detection board, resulting in an increase in the thickness of the detection board, this application places the shielding layer on the handle base, effectively avoiding problems such as signal transmission delay, reduced transmission speed, reduced overflow detection accuracy, difficulty in installing the detection board, and inability of the detection board to effectively adhere to the glass body caused by the increased thickness of the detection board.

[0009] In this application, the shielding layer projects its radial projection onto the capacitor plates, maximizing the shielding effect against external interference signals. The shielding layer is directly applied to the side of the handle facing the detection plate, eliminating the need for additional components. This not only reduces the number of parts and assembly steps but also significantly minimizes the space occupied between the handle and the detection plate, contributing to the miniaturization of the entire device. Furthermore, the coating and fixing method of the shielding layer ensures strong adhesion between the shielding layer and the handle under high-temperature conditions, preventing cracking and detachment, thus guaranteeing the stability of signal shielding.

[0010] The shielding layer is a metal shielding layer or a metal ink layer.

[0011] The shielding layer in this technical solution uses a metal shielding layer or a metallic ink layer. Compared to other non-metallic conductive materials, the high conductivity of metal shielding layers and metallic ink layers allows them to more efficiently reflect or absorb external interference signals. Furthermore, metal shielding layers and metallic ink layers effectively shield against both high-frequency and low-frequency interference signals, while non-metallic conductive materials are only suitable for specific frequency bands. Therefore, this technical solution can achieve wide-band coverage of interference signals and has superior shielding performance. Moreover, most existing handle bases are made of plastic. For metallic ink layers, they can be directly coated onto the surface of plastic materials without an additional substrate, reducing manufacturing costs.

[0012] The metal shielding layer or the metal ink layer is sprayed onto the inner surface of the handle base.

[0013] Because the inner surface of the handle base is not smooth, it often contains complex structures such as grooves and ribs. Compared with other coating processes such as electroplating, sputtering, and screen printing, this technical solution uses a spray coating process to form a metal shielding layer or a metallic ink layer on the inner surface of the handle base. The spray coating process can evenly cover all corners (including deep holes and corners) through atomization, which is not possible with other coating processes. Moreover, the progressive deposition characteristics of spray coating can reduce excessive accumulation of coating at edges and avoid local impedance abrupt changes caused by uneven thickness. In addition, the metal shielding layer or metallic ink layer is usually cured at 80℃-120℃ after spraying, which is suitable for the structure of the handle base made of plastic material. The lower curing temperature can prevent deformation of the handle base and ensure the yield rate of the handle base.

[0014] The detection board is a flexible circuit board, which is attached and fixed to the outer wall of the glass body.

[0015] In this technical solution, the detection board uses a flexible circuit board. This flexible circuit board can bend and conform to the curved outer wall of the glass cup, eliminating the installation gaps caused by the planar limitations of rigid circuit boards. This ensures that the capacitor electrodes on the flexible circuit board maintain a very close distance to the outer wall of the glass cup, maintaining both detection accuracy and consistency. Furthermore, the thin wall of the flexible circuit board reduces the space occupied between the glass cup and the handle base, making the overall structure of the liquid heater more streamlined and contributing to a better user experience.

[0016] The bottom of the glass cup is provided with a cup base, and the handle base is connected to the cup base by a metal fastener. The metal fastener is connected to the shielding layer. The handle base is also provided with a metal gasket that abuts against the metal fastener. The metal gasket is grounded.

[0017] The handle itself needs to be connected to the cup holder to secure the entire handle to the glass body. This technical solution uses metal fasteners for the handle mounting, and connects the metal fasteners to the shielding layer on the inner surface of the handle. This effectively utilizes the handle mounting to achieve signal transmission between the shielding layer and the metal fasteners. Furthermore, the metal fasteners abut against the metal gaskets, grounding the shielding layer through the grounding of the metal gaskets, thus providing a stable conductive path. The metal fasteners and metal gaskets form a surface-to-surface contact, resulting in a grounding resistance as low as 0.1mΩ, far lower than the 1-10mΩ of wire grounding, ensuring a low-impedance connection between the shielding layer and ground, effectively shielding external interference signals. Moreover, compared to other grounding methods, the metal fasteners and metal gaskets have high mechanical strength and a low probability of deformation under the influence of external temperature, ensuring the stability of the grounding connection during long-term use and reducing the decrease in shielding effect caused by loose connections, deformation, etc.

[0018] The handle base is provided with a positioning part, the positioning part is provided with two positioning posts, the positioning posts are provided with mounting holes for the metal fastener to pass through, and the positioning part is locked to the cup base in the vertical direction by the metal fastener.

[0019] This technical solution uses two positioning posts to form a two-point geometric constraint, which guides the handle seat and cup seat to align quickly and accurately, avoiding the risk of misalignment caused by single-point positioning. The positioning part is locked to the cup seat in the vertical direction by metal fasteners, so that the metal fasteners do not need to penetrate the handle seat radially. This allows the handle seat and grip part to be integrally injection molded, improving the production efficiency of the handle.

[0020] The metal pad is located above the positioning part, and the metal pad is grounded through a grounding wire. There is a clearance space between the two positioning posts for the grounding wire to pass through.

[0021] The shielding layer extends longitudinally along the height of the handle base inside. Positioning the metal gasket above the positioning part facilitates surface-to-surface contact between the shielding layer, metal fasteners, and metal gasket, ensuring stable electrical connections and guaranteeing stable and effective grounding of the shielding layer. The clearance space between the two positioning posts allows the grounding wire to pass through, maximizing space utilization and guiding the grounding wire to prevent tangling and interference with other components, thus reducing wear. Furthermore, the clearance space between the positioning posts allows for material reduction design, lowering costs and contributing to weight reduction.

[0022] The handle base is provided with a positioning part, and the positioning part is provided with a mounting hole for the metal fastener to pass through. The positioning part is locked to the cup base in the horizontal direction by the metal fastener.

[0023] This technical solution facilitates operation during installation by locking the handle seat and cup seat horizontally, which helps improve assembly efficiency. Moreover, by utilizing the longitudinal extension of the shielding layer in the height direction of the handle seat, it is possible to achieve surface-to-surface contact between the shielding layer, metal fasteners, and metal gaskets, eliminating the need for a horizontally extended design of the shielding layer and thus reducing the coating difficulty.

[0024] The metal gasket is located between the positioning part and the cup holder. The metal gasket is grounded through a grounding wire. The positioning part is provided with a lead wire groove for the grounding wire to pass through.

[0025] Placing a metal gasket between the positioning part and the cup seat increases the contact area between the metal gasket, metal fasteners, and the shielding layer, ensuring stable signal transmission from the shielding layer. A lead groove on the positioning part guides and limits the grounding wire, preventing significant movement during use and reducing wear, thus ensuring effective grounding of the shielding layer's signal.

[0026] The capacitor plate includes multiple first capacitor plates and multiple second capacitor plates. The multiple first capacitor plates form an overflow prevention detection area on the detection plate, and the multiple second capacitor plates form a water level detection area on the detection plate. The water level detection area is located below the overflow prevention detection area.

[0027] This technical solution significantly improves detection accuracy by setting multiple first capacitor electrodes. The overflow prevention detection area formed by multiple first capacitor electrodes increases the sensing area and detection coverage, ensuring detection efficiency and accuracy. Furthermore, with multiple first capacitor electrodes, if one electrode is damaged or fails for other reasons, the others can still perform the detection, preventing overflow detection failure. By setting multiple second capacitor electrodes, a water level detection area can be formed on the detection plate, enabling water level detection of the liquid heater. Different water level detections are achieved for different pulping capacities. The overflow prevention detection area and the water level detection area work together to achieve different overflow detections at different water levels, further increasing the functionality of the detection plate and improving the user experience. 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 the liquid heater portion structure according to one embodiment of this application;

[0030] Figure 2 This is an exploded view of the handle according to one embodiment of this application;

[0031] Figure 3 This is a perspective view of the liquid heater portion structure according to another embodiment of this application.

[0032] in,

[0033] 1. Glass body;

[0034] 2. Cup holder;

[0035] 3. Grip section;

[0036] 4. Handle base; 41. Shielding layer; 42. Positioning part; 421. Positioning post; 422. Mounting hole; 43. Metal gasket; 44. Clearance space; 45. Lead wire groove; 46. Grounding wire. Detailed Implementation

[0037] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] like Figure 1 and Figure 2 As shown, a liquid heater includes a glass cup body 1, a handle installed on one side of the glass cup body 1, and a detection plate located between the glass cup body 1 and the handle. The handle includes a handle base 4 and a gripping part 3 connected to the handle base 4. The side of the handle base 4 facing the detection plate is coated with a shielding layer 41, which is grounded. The detection plate is provided with a plurality of capacitor plates, and the projection of the shielding layer 41 along the radial direction of the glass cup body 1 covers the capacitor plates.

[0043] The liquid heater in this application can be a health pot, a food processor, or a soy milk maker, etc.

[0044] Compared to the existing technology that uses grounding shielding layer 41 to attach to the back of the detection board, resulting in an increase in the thickness of the detection board, this application places shielding layer 41 on handle base 4, effectively avoiding problems such as signal transmission delay, reduced transmission speed, reduced anti-overflow detection accuracy, difficulty in installing the detection board, and inability of the detection board to effectively adhere to the glass cup body 1 caused by the increased thickness of the detection board.

[0045] In this application, the shielding layer 41 projects its radial projection onto the capacitor plates, maximizing the shielding effect against external interference signals. The shielding layer 41 is directly coated on the side of the handle base 4 facing the detection plate, eliminating the need for additional components. This not only reduces the number of parts and assembly steps but also significantly reduces the space occupied between the handle base 4 and the detection plate, contributing to the miniaturization of the entire device. Furthermore, the coating and fixing method of the shielding layer 41 ensures the adhesion strength between the shielding layer 41 and the handle base 4 under high-temperature conditions, preventing cracking and detachment, thus guaranteeing the stability of signal shielding.

[0046] The structure of the shielding layer 41 in this application can be any of the following embodiments:

[0047] Implementation method 1: The shielding layer 41 is a non-metallic conductive material, such as conductive plastic or carbon-based coating.

[0048] Implementation Method 2: The shielding layer 41 is a metal shielding layer or a metallic ink layer. Compared to other non-metallic conductive materials, the high conductivity of metal shielding layers and metallic ink layers allows them to more efficiently reflect or absorb external interference signals. Furthermore, metal shielding layers and metallic ink layers effectively shield against both high-frequency and low-frequency interference signals, while non-metallic conductive materials are only suitable for specific frequency bands. Therefore, this technical solution can achieve wideband coverage of interference signals and has superior shielding performance. Moreover, most existing handle bases 4 are made of plastic. For metallic ink layers, they can be directly coated onto the surface of plastic materials without an additional substrate, reducing manufacturing costs.

[0049] As one embodiment of this second embodiment, the metal shielding layer or metal ink layer is coated on the inner surface of the handle base 4 using processes such as electroplating, sputtering or screen printing.

[0050] In a preferred embodiment of this second implementation, a metal shielding layer or a metallic ink layer is spray-coated onto the inner surface of the handle base 4. Because the inner surface of the handle base 4 is not smooth and often contains complex structures such as grooves and ribs, compared to other coating processes such as electroplating, sputtering, and screen printing, this embodiment uses a spray-coating process to form a metal shielding layer or a metallic ink layer on the inner surface of the handle base 4. The spray-coating process, through atomized spraying, can uniformly cover all corners (including deep holes and corners), which is not available in other coating processes. Furthermore, the progressive deposition characteristics of the spray-coating process can reduce excessive build-up of the coating at edges, avoiding local impedance abrupt changes caused by uneven thickness. In addition, the metal shielding layer or metallic ink layer is often cured at 80℃-120℃ after spraying, which is suitable for the plastic structure of the handle base 4. The lower curing temperature can prevent deformation of the handle base 4, ensuring the pass rate of the handle base 4.

[0051] This application does not limit the structural form of the detection plate, which can adopt any of the following embodiments:

[0052] Implementation method 3: The detection board is a rigid circuit board.

[0053] Implementation Method 4: The detection board is a flexible circuit board, which is adhered and fixed to the outer wall of the glass cup 1. The flexible circuit board can bend and conform to the curved outer wall of the glass cup 1, eliminating the installation gaps caused by the planar limitations of rigid circuit boards. This ensures that the capacitor plates on the flexible circuit board can maintain a very close distance to the outer wall of the glass cup 1, maintaining both detection accuracy and consistency. Moreover, the flexible circuit board has a very thin wall thickness, reducing the space occupied between the glass cup 1 and the handle base 4, making the overall structure of the liquid heater thinner and contributing to a better user experience.

[0054] As a preferred embodiment of this application, such as Figure 1 and Figure 2As shown, the bottom of the glass cup body 1 is provided with a cup base 2, and the handle base 4 is connected to the cup base 2 by a metal fastener. The metal fastener is connected to the shielding layer 41. The handle base 4 is also provided with a metal gasket 43 that abuts against the metal fastener, and the metal gasket 43 is grounded. The handle base 4 itself also needs to be connected to the cup base 2 to realize the installation and fixation of the entire handle on the glass cup body 1. In this technical solution, metal fasteners are used in the installation and fixation of the handle base 4, and the metal fasteners are connected to the shielding layer 41 on the inner surface of the handle base 4. Thus, the installation and fixation of the handle base 4 effectively realizes the signal transmission between the shielding layer 41 and the metal fasteners. Furthermore, the metal fasteners abut against the metal gasket 43 to ground the shielding layer 41 through the grounding of the metal gasket 43, thereby providing a stable conductive path. Moreover, the metal fasteners and the metal gasket 43 can form a surface-to-surface contact, and the grounding resistance can be as low as below 0.1mΩ, which is far lower than the 1-10mΩ of the wire grounding, ensuring a low impedance connection between the shielding layer 41 and the ground, and effectively shielding external interference signals. Moreover, compared with other grounding methods, metal fasteners and metal gaskets 43 have high mechanical strength and a low probability of deformation under the influence of external ambient temperature, which can ensure the stability of the grounding connection during long-term use and reduce the decrease in shielding effect caused by factors such as loose connection and deformation.

[0055] In this embodiment, the specific fixing method of the handle base 4 can be any one of the following embodiments:

[0056] Example 1: As Figure 2 As shown, the handle base 4 is provided with a positioning part 42, which has two positioning posts 421. Each positioning post 421 has a mounting hole 422 for a metal fastener to pass through. The positioning part 42 is locked to the cup base 2 in the vertical direction by the metal fastener. In this embodiment, the two positioning posts 421 form a two-point geometric constraint, which can guide the handle base 4 and the cup base 2 to align quickly and accurately, avoiding the risk of misalignment caused by single-point positioning. The positioning part 42 is locked to the cup base 2 in the vertical direction by the metal fastener, so that the metal fastener does not need to penetrate the handle base 4 radially, thus allowing the handle base 4 and the grip part 3 to be integrally injection molded, improving the production efficiency of the handle.

[0057] Furthermore, such as Figure 2As shown, the metal gasket 43 is located above the positioning part 42. The metal gasket 43 is grounded through the grounding wire 46, and there is a clearance space 44 between the two positioning posts 421 for the grounding wire 46 to pass through. The metal fastener can be, for example, a screw. The shielding layer 41 extends longitudinally along the height direction of the handle seat 4 inside the handle seat 4. Placing the metal gasket 43 above the positioning part 42 helps to achieve surface-to-surface contact between the shielding layer 41, the end of the metal fastener, and the metal gasket 43, thereby ensuring the stability of the electrical connection between the three and ensuring that the shielding layer 41 can be stably and effectively grounded. The clearance space 44 between the two positioning posts 421 allows the grounding wire 46 to pass through. On the one hand, it can make full use of the space, and on the other hand, it can guide the grounding wire 46, avoiding tangled wires and interference with other components, thus preventing increased wear. Furthermore, the clearance space 44 between the positioning posts 421 can realize material reduction design, which reduces costs and contributes to weight reduction.

[0058] As an alternative implementation, the metal gasket 43 is located below the positioning part 42. The metal fastener includes a double-ended stud and two nuts, which are located above and below the positioning part 42, respectively. The nut located above can make contact with the shielding layer 41, and the nut located below can install and fix the metal gasket 43. With this configuration, the metal gasket 43 can be positioned at the bottom.

[0059] Example 2: As Figure 3 As shown, the handle seat 4 is provided with a positioning part 42, and the positioning part 42 is provided with a mounting hole 422 for metal fasteners to pass through. The positioning part 42 is locked to the cup seat 2 in the horizontal direction by metal fasteners.

[0060] In this embodiment 2, by locking the handle seat 4 and the cup seat 2 in the horizontal direction, the operation is convenient during the installation process, which helps to improve the assembly efficiency. Moreover, by means of the longitudinal extension of the shielding layer 41 in the height direction of the handle seat 4, the surface-to-surface contact between the shielding layer 41, the metal fastener and the metal gasket 43 can be achieved, without the need to design the shielding layer 41 to be horizontally extended, thereby reducing the coating difficulty.

[0061] In embodiment 2, to facilitate the application of force during the connection between the handle base 4 and the cup holder 2, the handle base 4 and the grip part 3 are designed as separate structures. A metal fastener extends laterally through the handle base 4. After the handle base 4 and the cup holder 2 are connected and fixed, the grip part 3 is then installed onto the handle base 4. Alternatively, the handle base 4 and the grip part 3 can be integrally formed. However, the connection point of the metal fastener on the handle base 4 is located in an area not covered by the grip part 3. To prevent the metal fastener from being exposed and rusting, a cover is needed to conceal the metal fastener.

[0062] Furthermore, such as Figure 3As shown, the metal gasket 43 is located between the positioning part 42 and the cup seat 2. The metal gasket 43 is grounded through the grounding wire 46, and the positioning part 42 is provided with a lead groove 45 for the grounding wire 46 to pass through. Placing the metal gasket 43 between the positioning part 42 and the cup seat 2 increases the contact area between the metal gasket 43, the metal fastener, and the shielding layer 41, ensuring stable signal transmission of the shielding layer 41. The lead groove 45 on the positioning part 42 for the grounding wire 46 to pass through guides and limits the grounding wire 46, preventing it from moving significantly during use, thereby reducing its wear and ensuring effective grounding of the signal of the shielding layer 41.

[0063] The arrangement of the capacitor plates on the detection board in this application can adopt any of the following embodiments:

[0064] Implementation Method 5: Multiple capacitor plates are spaced longitudinally on the detection plate, forming an anti-overflow detection zone to prevent liquid from overflowing during cooking. In this implementation method, the dry-burn detection of the liquid heater can be achieved by installing temperature sensors or other detection elements in the cup holder 2 or other locations.

[0065] Implementation Method Six: The capacitor plate includes multiple first capacitor plates and multiple second capacitor plates. The multiple first capacitor plates form an overflow prevention detection area on the detection plate, and the multiple second capacitor plates form a water level detection area on the detection plate, located below the overflow prevention detection area. This Implementation Method Six, by setting multiple first capacitor plates, can significantly improve detection accuracy. The overflow prevention detection area formed by the multiple first capacitor plates helps to increase the sensing area and detection coverage area, ensuring detection efficiency and accuracy. Furthermore, by setting multiple first capacitor plates, if one first capacitor plate is damaged or fails for other reasons, the other first capacitor plates can still achieve the detection effect, avoiding the phenomenon of overflow prevention detection failure. By setting multiple second capacitor plates, a water level detection area can be formed on the detection plate to realize water level detection of the liquid heater. Different water level detections can be achieved for different pulping capacities. The overflow prevention detection area and the water level detection area work together to achieve different overflow prevention detections at different water levels, further increasing the functionality of the detection plate and improving the user experience.

[0066] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0067] 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.

[0068] 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 a glass cup body, a handle mounted to one side of the glass cup body, and a detection plate located between the glass cup body and the handle, the handle comprising a handle base and a grip portion connected to the handle base, characterized in that, The handle seat side facing the detection plate is coated with a shielding layer, the shielding layer is grounded, the detection plate is provided with a plurality of capacitor plates, and the projection of the shielding layer along the radial direction of the glass cup covers the capacitor plates.

2. The liquid heater according to claim 1, wherein The shielding layer is a metal shielding layer or a metal ink layer.

3. The liquid heater according to claim 2, wherein The metal shielding layer or the metal ink layer is spray formed on the inner surface of the handle seat.

4. The liquid heater according to claim 1, wherein The detection plate is a flexible circuit board, and the flexible circuit board is fixedly attached to the outer sidewall of the glass cup.

5. The liquid heater according to claim 1, wherein The bottom of the glass cup is provided with a cup seat, the handle seat is connected with the cup seat through a metal fastener, the metal fastener is connected with the shielding layer, and the handle seat is further provided with a metal gasket abutting against the metal fastener, and the metal gasket is grounded.

6. The liquid heater according to claim 5, wherein The handle seat is provided with a positioning portion, the positioning portion is provided with two positioning columns, the positioning columns are provided with mounting holes for the metal fastener to pass through, and the positioning portion is locked to the cup seat in the upward and downward directions through the metal fastener.

7. The liquid heater according to claim 6, wherein The metal gasket is located above the positioning portion, the metal gasket is grounded through a grounding wire, and there is a space for the grounding wire to pass through between the two positioning columns.

8. The liquid heater according to claim 5, wherein The handle seat is provided with a positioning portion, the positioning portion is provided with mounting holes for the metal fastener to pass through, and the positioning portion is locked to the cup seat in the horizontal direction through the metal fastener.

9. The liquid heater according to claim 8, wherein The metal gasket is located between the positioning portion and the cup seat, the metal gasket is grounded through a grounding wire, and the positioning portion is provided with a lead slot for the grounding wire to pass through.

10. The liquid heater according to any one of claims 1 to 9, wherein The capacitor plates include a plurality of first capacitor plates and a plurality of second capacitor plates, the plurality of first capacitor plates form an anti-overflow detection area on the detection plate, the plurality of second capacitor plates form a water level detection area on the detection plate, and the water level detection area is located below the anti-overflow detection area.

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