Liquid heater

Abstract

The utility model provides a liquid heater, which relates to a liquid heater and comprises a glass cup body and a hard PCB (printed circuit board) arranged on the peripheral side wall of the glass cup body, the hard PCB is arranged along the height direction of the glass cup body, and the hard PCB is sequentially provided with an anti-overflow electrode, a control chip and a temperature sensor from top to bottom. The spill-proof electrode and the temperature sensor are both electrically connected with the control chip, the temperature detection end of the temperature sensor is suspended on the hard PCB through a flexible conductive piece, and the temperature detection end is tightly attached to the outer side of the glass cup body. The liquid heater is used for solving the technical problems that in the prior art, a hard PCB is installed on a cup body, and a temperature sensor needs to be integrated on the hard PCB, so that the temperature sensor is prone to damage or slow in response.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid heaters, in particular to a liquid heater. Background Art

[0002] Liquid heaters are typically designed as household appliances for boiling water, brewing tea, or other beverages. To ensure safety and provide convenient functionality, liquid heaters need to sense and detect the beverage's state to prevent foam from overflowing during the boiling process. Therefore, the lid of the liquid heater incorporates multiple sensors to detect the beverage's state.

[0003] Common sensors for liquid heaters generally include water level sensors, temperature sensors, and anti-overflow sensors.

[0004] For example, in prior art CN202222200376.X, a water level sensor is installed on the side wall of the kettle. Specifically, a through-hole is provided in the side wall of the kettle, and the sensor is inserted through the through-hole in the kettle to detect the water level. A handle is also used to shield the sensor circuit, improving the aesthetics of the liquid heater.

[0005] For example, the prior art CN200920224720.0 also discloses an anti-overflow electric kettle, which installs an anti-overflow electrode on the side wall of the kettle body. When an overflow signal is detected at the detection end of the anti-overflow electrode, the anti-overflow electrode controls the heating component through a conductive member.

[0006] For example, prior art CN202121643473.5 discloses an electric kettle in which a temperature measuring assembly is located on the outer surface of a glass body, typically within the mounting space between the handle and the glass body. This allows the temperature measuring assembly to be fixed tightly against the glass body and accurately measure the temperature by squeezing the inner side of the handle against the outer wall of the glass body.

[0007] In practice, liquid heaters are often equipped with temperature sensors and overflow prevention electrodes, which work in conjunction with each other. For example, during the heating process, rising temperatures may cause the liquid to expand or boil. The overflow prevention sensor and temperature sensor work together. Once the temperature sensor detects that the beverage is boiling or nearing boiling, the overflow prevention sensor begins detecting overflow signals to prevent the beverage from spilling.

[0008] However, during the installation process, each sensor needs to be installed independently, which makes the installation process cumbersome. Therefore, the prior art CN202322941952.0 proposes a PCB detection board for liquid level detection, which uses a capacitor electrode to simultaneously detect the liquid level and overflow signal. At the same time, the lower side of the PCB detection board is also equipped with a control chip, and the capacitor electrode is electrically connected to the control chip. When the capacitor electrode detects that the slurry of the current pulping capacity has reached the preset anti-overflow detection position, the control chip will transmit the signal to the main control device, and the main control device will perform corresponding operations according to the program settings, such as stopping the motor, stopping the heating, etc. to prevent overflow.

[0009] However, this solution lacks an integrated temperature sensor, requiring a separate temperature sensor to be installed on the cup body or heating structure. Furthermore, existing liquid heaters often use rigid PCBs to reduce costs, making temperature sensors difficult to install on rigid PCBs and subject to issues such as easy damage and slow response. Utility Model Content

[0010] The utility model aims to provide a liquid heater to solve the technical problems in the prior art of installing a hard PCB on a cup body and integrating a temperature sensor on the hard PCB, which causes the temperature sensor to be easily damaged or respond slowly.

[0011] An embodiment of the present application provides a liquid heater, comprising a glass cup body and a hard PCB arranged on the outer peripheral side wall of the glass cup body. The hard PCB is arranged along the height direction of the glass cup body. The hard PCB is provided with an anti-overflow electrode, a control chip and a temperature sensor from top to bottom. The anti-overflow electrode and the temperature sensor are both electrically connected to the control chip. The temperature detection end of the temperature sensor is suspended on the hard PCB through a flexible conductive part, and the temperature detection end is in close contact with the outer side of the glass cup body.

[0012] Furthermore, the rigid PCB is provided with a hollow area, and the temperature detection end is located in the hollow area.

[0013] Furthermore, the temperature detection end is attached to the glass body by glue.

[0014] Furthermore, a contact is provided on a side of the hard PCB away from the kettle body, the contact is electrically connected to the control chip, and the flexible conductive part of the temperature detection end is electrically connected to the contact.

[0015] Furthermore, the hard PCB is also provided with a water level sensor, which is arranged side by side with the temperature sensor, and the lower edge of the water level sensor is not lower than the lower edge of the glass body.

[0016] Furthermore, the water level sensor comprises at least two water level electrodes arranged side by side, and each water level electrode is arranged longitudinally.

[0017] Furthermore, the water level sensor includes at least two water level electrodes arranged side by side, and both of the water level electrodes are located on one side of the temperature sensor.

[0018] Furthermore, the temperature sensor is located below the lowest water level line of the glass body.

[0019] Furthermore, the anti-overflow electrode is located on a side of the hard PCB facing the glass cup body, and the control chip is located on a side of the hard PCB away from the glass cup body.

[0020] Furthermore, the anti-overflow electrode extends from the upper end of the control chip to the upper end of the hard PCB.

[0021] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0022] The anti-overflow electrode, control chip and temperature sensor are all integrated into the rigid PCB, thereby improving the convenience of installation. At the same time, the temperature detection end of the temperature sensor is suspended on the rigid PCB and close to the glass cup body. "Suspended" means that the temperature detection end maintains a certain distance from the rigid PCB through a conductive part, a bracket or other supporting structure, and does not directly fix or weld the detection end to the rigid PCB, so that the temperature detection end can be close to the surface of the glass cup body, and the measurement result will not be interfered by the PCB heat due to direct installation on the rigid PCB, thereby improving the response time of the temperature sensor and the accuracy of temperature measurement. The above-mentioned temperature detection end is connected to the rigid PCB through flexible conductive parts such as soft cables, wires or elastic hardware, so that the pressing force on the rigid PCB will not directly act on the temperature detection end, thereby preventing the pressing force from crushing the temperature detection end, and also achieving close contact between the temperature detection end and the glass cup body.

[0023] On the other hand, the hard PCB is already set on the outer wall of the glass cup body, and the temperature sensor is set on the hard PCB. The temperature detection end of the temperature sensor only needs to extend out of the hard PCB, and the temperature detection end can be tightly attached to the glass cup body. There is no need to extend the flexible conductive part of the temperature detection end, which not only ensures the convenience of installation, but also ensures the consistency of the installation position of the temperature detection end. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure in which the temperature detection end of the present application extends out of the rigid PCB.

[0025] Figure 2 This is a structural diagram of the flexible conductive part of the present application pressing the temperature detection end.

[0026] Figure 3 This is a structural diagram of the temperature detection end of the present application located in the hollow area.

[0027] Figure 4 This is a structural schematic diagram of the application in which the temperature detection end is located below the lowest water level line of the glass cup body.

[0028] Figure 5 This is a structural diagram of the water level sensor of the present application located on the same side as the temperature detection end.

[0029] Figure 6 This is a structural diagram of the water level sensor of the present application located on both sides of the temperature detection end.

[0030] Reference numerals:

[0031] 1-Hard PCB, 101-Contact, 102-Hollowed area, 2-Anti-overflow electrode, 3-Control chip, 4-Temperature sensor, 401-Temperature detection end, 402-Flexible conductive part, 5-Water level sensor, 501-Water level electrode, 6-Glass cup body, 601-Minimum water level line. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] To reduce installation steps, liquid heaters often integrate multiple sensors into a single component. A common approach is to integrate the sensors onto a printed circuit board (PCB), which is then mounted on the outer sidewall of the glass body 6. Furthermore, due to the high cost of flexible PCBs, existing liquid heaters often utilize a rigid PCB 1. However, in practice, directly integrating the temperature sensor 4, overflow prevention electrode 2, and control chip 3 onto the rigid PCB 1 presents numerous challenges.

[0034] To reduce the heat transfer path between the glass body 6 and the temperature detection end 401 of the temperature sensor 4 and prevent the temperature detection end 401 from responding too slowly, the prior art places the temperature sensor 4 on the side of the rigid PCB 1 closest to the glass body 6. However, if the temperature sensor 4 is placed directly on the side of the rigid PCB 1 closest to the glass body 6, the process of securing the rigid PCB 1 may damage the temperature sensor 4. As in the prior art, the temperature measurement assembly is secured by squeezing the inner side of the handle against the outer wall of the glass body 6, allowing the temperature sensor 4 to rest against the glass body 6 and measure the temperature. However, during installation, the pressing force between the rigid PCB 1 and the glass body 6 is difficult to control, which can easily cause the temperature sensor 4 to collapse and become damaged.

[0035] On the other hand, to ensure its strength, the rigid PCB 1 is often thick (generally over 1.4 mm). If, to avoid damage to the temperature sensor, the temperature sensor 4 is placed on the side of the rigid PCB 1 away from the glass 6, the thick rigid PCB 1 will cause the heat from the glass 6 to take longer to transfer to the temperature sensor 4, affecting the temperature sensor 4's response speed.

[0036] In order to avoid the above problems, the present invention integrates the anti-overflow electrode 2, the control chip 3 and the temperature sensor 4 into the rigid PCB 1. At the same time, the temperature detection end 401 of the temperature sensor 4 is suspended on the rigid PCB 1 and is in close contact with the glass body 6, thereby improving the convenience of installation while also improving the detection accuracy of the temperature sensor 4. "Suspended" means that the temperature detection end 401 is kept at a certain distance from the rigid PCB 1 through a conductive member, a bracket or other supporting structure, and does not mean that the detection end is directly fixed or welded to the rigid PCB 1, so that the temperature detection end 401 can be in close contact with the surface of the glass body 6. Compared with the solution of directly installing on the rigid PCB 1, which causes the measurement results to be interfered with by the residual heat of the PCB, the solution of this embodiment improves the response time of the temperature detection end 401 and the accuracy of temperature measurement. The above-mentioned temperature detection end 401 is connected to the hard PCB1 through a flexible conductive part 402 such as a soft cable, a wire or elastic hardware, so that the pressing force of installing the hard PCB1 will not directly act on the temperature detection end 401, thereby preventing the pressing force from crushing the temperature detection end 401, and also achieving the purpose of keeping the temperature detection end 401 in close contact with the glass cup body 6.

[0037] In the prior art, there is also a solution in which the temperature sensor 4 and the rigid PCB 1 are independently installed. Generally, if the temperature sensor 4 is also installed on the side wall of the glass cup body 6; in the prior art solution, the temperature sensor 4 needs to be electrically connected to the coupler or the circuit board in the bottom cover via a longer wire. Compared with this embodiment, the prior art solution requires a longer flexible conductive member 402, which makes it difficult to consistent the installation position of the temperature detection end 401 between different liquid heaters. When using the same detection threshold, the detection error of the temperature detection end 401 is increased. In this embodiment, the rigid PCB 1 is already installed on the outer wall of the glass cup body 6, and the temperature sensor 4 is installed on the rigid PCB 1. The temperature detection end 401 only needs to extend from the rigid PCB 1, and the temperature detection end 401 can be closely attached to the glass cup body 6. There is no need to extend the flexible conductive member 402 of the temperature detection end 401. This not only ensures the convenience of installation, but also takes into account the consistency of the installation position of the temperature detection end 401.

[0038] During actual installation, because the materials of the flexible conductive member 402 are different, the manner in which the temperature detection end 401 is suspended on the rigid PCB 1 is also different.

[0039] like Figure 1 As shown, the temperature sensing terminal 401 is connected to the rigid PC B1 using a flexible conductive component 402, such as a flexible flat cable or wire. Compared to conductive hardware, flexible flat cables and wires offer greater flexibility and bendability, facilitating the adjustment of the temperature sensing terminal 401's position. However, maintaining a close contact between the temperature sensing terminal 401 and the exterior of the glass 6 using only flexible flat cables and wires is difficult. Therefore, the temperature sensing terminal 401 is often attached to the glass 6 using adhesive.

[0040] When the temperature detection end 401 is in close contact with the outer side of the glass body 6 via double-sided tape, the double-sided tape can be placed on the bottom of the temperature detection end 401 for connection to the glass body 6. Although the double-sided tape is separated from the temperature detection end 401 and the glass body 6, the thickness of the double-sided tape is relatively thin, which has little effect on temperature detection. Compared with the existing technology, the response speed and detection accuracy of the temperature detection end 401 are still improved. Therefore, those skilled in the art will also understand that the temperature detection end 401 is still in close contact with the outer side of the glass body 6 through the double-sided tape.

[0041] When the temperature sensing terminal 401 is tightly attached to the outside of the glass body 6 via single-sided tape, the rigid PCB 1 can be first installed on the glass body 6 (by gluing or other means), and then the tape can be used to cover both the temperature sensing terminal 401 and the glass body 6, ensuring that the temperature sensing terminal 401 is tightly attached to the outside of the glass body 6. During the installation process, the temperature sensing terminal 401 will not be squeezed by the rigid PCB 1, and the problem of slow response of the temperature sensing terminal 401 during the detection process is avoided.

[0042] like Figure 2 As shown, the temperature sensing terminal 401 is connected to the rigid PCB 1 using elastic hardware. The elasticity of the hardware allows the temperature sensing terminal 401 to abut against the glass body 6. The rigid PCB 1 is provided with contacts 101, which are electrically connected to the control chip 3. The hardware is bent toward the glass body 6 to allow the sensing terminal to adhere to the glass body 6. For easier installation, the bending of the temperature sensing terminal 401 can be increased so that it is in close contact with the glass body 6 before installation, and then the rigid PCB 1 is secured.

[0043] Furthermore, in actual use, since the flexible conductive member 402 itself has a certain thickness, if the flexible conductive member 402 is located between the glass body 6 and the rigid PCB 1, it may cause the rigid PCB 1 to tilt, resulting in an inconsistent spacing between the overflow prevention electrode 2 and the glass body 6, affecting the detection accuracy of the overflow prevention electrode 2. Therefore, the side of the rigid PCB 1 away from the kettle body is provided with a contact 101. The contact 101 is electrically connected to the control chip 3, and the flexible conductive member 402 of the temperature detection end 401 is electrically connected to the contact 101.

[0044] The position of the temperature detection end 401 is also different for hard PCBs 1 of different shapes. Depending on whether the hard PCB 1 is hollowed out, the hard PCB 1 can be divided into a "non-hollowed out" hard PCB 1 and a "hollowed out" hard PCB 1.

[0045] For a non-hollowed-out rigid PCB 1, the rigid PCB 1 is typically rectangular or similar in shape. The rigid PCB 1 does not need to be reshaped when installing the temperature sensor 4. The temperature sensing end 401 is placed on the glass cup 6 outside the rigid PCB 1. The temperature sensing end 401 is connected to the rigid PCB 1 via a flexible conductive member 402. The temperature sensing end 401 is typically located 1 mm to 5 mm outside the rigid PCB 1.

[0046] For a hollowed-out rigid PCB 1, the rigid PCB 1 needs to be hollowed out. The temperature detection terminal 401 is located in the hollowed-out portion of the PCB, which can reduce the probability of damage to the temperature detection terminal 401 by impact. The specific location of the hollowing out can include various situations.

[0047] If the non-edge portion of the rectangular rigid PCB 1 is hollowed out, a hollow area 102 is formed by four sides of the rigid PCB 1, and the temperature detection end 401 is located in the hollow area 102. Figure 3 As shown, the temperature detection end 401 is located in the hollow area 102 and attached to the glass cup body 6 , and the temperature detection end 401 is connected to the hard PCB 1 through the flexible conductive member 402 .

[0048] If the corners of the rectangular rigid PCB 1 are hollowed out, a hollow area 102 with an opening is formed by two sides of the rigid PCB 1, and the temperature detection end 401 is located in the hollow area 102. Figure 5 As mentioned below, when the water level electrode 501 is located on one side of the hard PCB1, the width of the water level electrode 501 is smaller than the width of the hard PCB1, and the areas at the corners of the water level electrode 501 and the hard PCB1 are hollowed out to form two hollow areas 102 with openings on the side edges of the hard PCB1, and the temperature detection end 401 is located in the hollow area 102.

[0049] If the edges (not corners) of the rectangular rigid PCB 1 are hollowed out, a hollow area 102 with an opening is formed by three sides of the rigid PCB 1, and the temperature detection end 401 is located in the hollow area 102. Figure 6 As mentioned below, when there are two water level electrodes 501, and the two water level electrodes 501 are respectively arranged on the left and right sides of the hard PCB1, the hard PCB1 between the two water level electrodes 501 is hollowed out, and the hollowed-out part is close to the edge of the hard PCB1, forming a hollowed-out area 102 with an opening formed by three side edges of the hard PCB1, and the temperature detection end 401 is located in the hollowed-out area 102.

[0050] When installing the rigid PCB 1, in order to increase the detection range of the anti-overflow electrode 2, the rigid PCB 1 is set along the height direction of the glass cup body 6, and the anti-overflow electrode 2, the control chip 3 and the temperature sensor 4 are arranged in sequence from top to bottom on the rigid PCB 1. The temperature detection end 401 is located on the lower side of the rigid PCB 1. Relative to the glass cup body 6, the temperature detection end 401 is located at the lower end of the outer peripheral side wall of the glass cup body 6, so that the temperature detection end 401 can normally detect the temperature of the liquid even when the water level is low. Preferably, as Figure 4 As shown, the temperature sensing end 401 is located below the lowest water level 601 of the glass 6, ensuring that the temperature sensing end 401 can measure the liquid temperature even at extremely low water levels. If the heating element of the liquid heater is located at the bottom of the glass 6, the temperature sensing end 401 is located below the lowest water level 601 of the glass 6, making the temperature sensing end 401 closer to the heating element. The temperature sensing end 401 can detect abnormal temperature increases in the glass 6 more quickly, thereby helping to improve the liquid heater's dry-boil prevention performance.

[0051] To maximize the area utilization of the rigid PCB 1, the control chip 3 is often positioned near the upper end of the temperature sensing terminal 401. Consequently, the control chip 3 is typically located in the lower-middle portion of the rigid PCB 1. To achieve a wider detection range, the overflow prevention electrode 2 extends from the upper end of the control chip 3 to the upper end of the rigid PCB 1 to detect overflow signals. Preferably, the overflow prevention electrode 2 extends as far as possible above and below the maximum water level of the glass 6.

[0052] The above-mentioned anti-overflow electrode 2 is generally a capacitor electrode for detecting liquid and foam. The anti-overflow electrode 2 can be arranged on the side of the hard PCB1 facing the glass cup body 6 or on the side away from the glass cup body 6. If the thickness of the hard PCB1 is relatively thick, placing the anti-overflow electrode 2 on the side of the hard PCB1 away from the glass cup body 6 may cause the signal detected by the anti-overflow electrode 2 to be weak. In order to ensure the accuracy of the detection, the anti-overflow electrode 2 needs to be closer to the glass cup body 6. The above-mentioned anti-overflow electrode 2 can be located on the side of the hard PCB1 facing the glass cup body 6. The thickness of the above-mentioned control chip 3 is generally about 1 mm. Compared with the hard PCB1 with a thickness of more than 1.4 mm, the control chip 3 protrudes from the hard PCB1. If the control chip 3 is located on the side of the hard PCB1 away from the glass cup body 6, it is easy to cause the hard PCB1 to tilt, resulting in inconsistent distances between the anti-overflow electrodes 2 at different heights and the cup body, affecting the detection effect. Therefore, the control chip 3 is located on the side of the hard PCB 1 away from the glass cup body 6, thereby preventing the hard PCB 1 from tilting, resulting in inconsistent spacing between the capacitor electrode and the glass cup body 6 at different heights.

[0053] Further, such as Figure 5 As shown, the rigid PCB 1 may also integrate a water level sensor 5. This water level sensor 5 is located below the control chip 3, with its lower edge no lower than the lower edge of the glass 6. The low height of the water level sensor 5 allows it to detect the water level at the bottom of the glass 6, thereby implementing dry-boil prevention for the liquid heater. Preferably, the upper edge of the water level sensor 5 is below the lowest water level 601 of the liquid heater.

[0054] The water level sensor 5 and the temperature detection terminal 401 are arranged side by side. "Side by side" means that the water level sensor 5 and the temperature detection terminal 401 are physically adjacent and relatively parallel to each other. In other words, the water level sensor 5 and the temperature detection terminal 401 are placed adjacent to each other on the same horizontal plane on the underside of the rigid PCB 1. This facilitates cross-correlation of the data detected by the water level sensor 5 and the temperature detection terminal 401, allowing the temperature data to be determined in the presence or absence of water, thereby enabling the liquid heater to determine the state of the liquid and prevent dry boiling.

[0055] In actual use, if a single water level electrode 501 is used to detect the water level, it is difficult to determine whether the detected signal is a real change in the water level or a liquid surface fluctuation caused by boiling or bubble bursting. Therefore, the above-mentioned water level sensor 5 includes at least two water level electrodes 501 arranged side by side. The side-by-side arrangement enables the water level electrodes 501 to sense changes in the water level synchronously or differentially, which can effectively avoid misjudgments caused by local fluctuations in the water surface. Each water level electrode 501 is arranged vertically. The vertical arrangement can cover a wider range of liquid level heights and provide stable detection results even at low or high liquid levels, avoiding loss of detection function due to extreme changes in the liquid level. In addition, the water level electrodes 501 can also be arranged horizontally.

[0056] The water level sensor 5 includes at least two water level electrodes 501 arranged side by side. The water level electrodes 501 are both located on the same side of the temperature detection end 401 .

[0057] In addition, Figure 6 As shown, the water level sensor 5 includes two water level electrodes 501 arranged side by side. The water level electrodes 501 are arranged longitudinally. The water level electrodes 501 are respectively located on both sides of the temperature detection end 401 in the horizontal direction, thereby increasing the lateral distance between the water level electrodes 501. It is more difficult for water surface fluctuations or local water vapor interference to affect the two water level electrodes 501 at the same time, reducing the probability of misjudgment caused by environmental factors or liquid fluctuations.

[0058] The water level sensor 5 can be located on the side of the rigid PCB 1 facing the glass 6 or on the side facing away from the glass 6. Types of water level sensors 5 include, but are not limited to, capacitive water level sensors 5, ultrasonic water level gauges, and photoelectric water level sensors 5. Furthermore, if the rigid PCB 1 is thick, placing the water level sensor 5 on the side facing away from the glass 6 may result in a weaker signal. To ensure accurate detection, the water level sensor 5 needs to be closer to the glass 6. Alternatively, the water level sensor 5 can be placed on the side of the rigid PCB 1 facing the glass 6.

[0059] In actual use, the rigid PCB 1 can be adhered to the glass body 6 by gluing or pouring glue. Alternatively, the rigid PCB 1 can be pressed against the glass body 6 by using a handle. Furthermore, a mounting bracket is provided on the side of the rigid PCB 1 facing away from the glass body 6. The rigid PCB 1 is positioned within the bracket, which is connected to the glass body 6 or the handle to facilitate installation. A glue injection port is provided on the mounting bracket corresponding to the detection terminal. After the rigid PCB 1 and temperature detection terminal 401 are installed in the desired position, the temperature detection terminal 401 can be glued.

[0060] In addition, it should be noted that the liquid heater of the present invention is not limited to the food processor with an integrated motor and cup body disclosed in the embodiment of the present invention. It can also be a soymilk maker with a top-mounted motor, a wall-breaking machine with a separate cup body and base, and a food processor that can achieve automatic pulp discharge and automatic cleaning without hand washing. Moreover, the liquid heater of the present invention can also be applied to heating appliances that can perform pulp boiling operations, rice paste making, etc., such as health pots and health pots.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A liquid heater comprising a glass body and a rigid PCB disposed on the outer peripheral sidewall of the glass body, wherein the rigid PCB is disposed along the height direction of the glass body, characterized in that: The hard PCB is provided with an anti-overflow electrode, a control chip and a temperature sensor in sequence from top to bottom. The anti-overflow electrode and the temperature sensor are both electrically connected to the control chip. The temperature detection end of the temperature sensor is suspended on the hard PCB through a flexible conductive member, and the temperature detection end is in close contact with the outer side of the glass body.

2. The liquid heater according to claim 1, characterized in that: The hard PCB is provided with a hollow area, and the temperature detection end is located in the hollow area.

3. The liquid heater according to claim 1, characterized in that: The temperature detection end is attached to the glass body by glue.

4. The liquid heater according to claim 1, characterized in that: A contact is provided on a side of the hard PCB away from the kettle body, the contact is electrically connected to the control chip, and the flexible conductive member of the temperature detection end is electrically connected to the contact.

5. The liquid heater according to claim 1, characterized in that: The hard PCB is further provided with a water level sensor, which is arranged side by side with the temperature sensor, and the lower edge of the water level sensor is not lower than the lower edge of the glass body.

6. The liquid heater according to claim 5, characterized in that: The water level sensor comprises at least two water level electrodes arranged side by side, and each water level electrode is arranged longitudinally.

7. The liquid heater according to claim 5, characterized in that: The water level sensor includes at least two water level electrodes arranged side by side, and both of the water level electrodes are located on one side of the temperature sensor.

8. The liquid heater according to claim 1, characterized in that: The temperature sensor is located below the lowest water level line of the glass body.

9. The liquid heater according to claim 1, characterized in that: The anti-overflow electrode is located on a side of the hard PCB facing the glass cup body, and the control chip is located on a side of the hard PCB away from the glass cup body.

10. The liquid heater according to claim 9, characterized in that: The overflow prevention electrode extends from the upper end of the control chip to the upper end of the hard PCB.

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