Integrated temperature and water level detection system and electric kettle

Abstract

The utility model discloses a kind of detection system and electric kettle of integration temperature and water level, it is related to temperature and water level detection technical field, comprising: temperature detection module, with the conductive detection end for contacting measured medium;Water level detection module, including capacitive detection unit and electrical connection terminal, the capacitive detection unit is formed capacitive detection loop with the conductive detection end of temperature detection module by electrical connection terminal, to detect water level by medium dielectric constant change;Control module is electrically connected with temperature detection module and water level detection module respectively, for receiving and processing temperature detection signal and water level detection signal;By designing water level detection module and temperature detection module common metal shell structure, without adding redundant components in glass kettle body, both retain the transparent characteristic of glass kettle body, also through the accurate identification of "water-no water" improves the response speed of dry-burn protection.

Description

Technical Field

[0001] This utility model relates to the field of temperature and water level detection technology, specifically to an integrated temperature and water level detection system and an electric kettle. Background Technology

[0002] With the increasing demand for smart and safe home appliances, glass kettles have become a common heating device in homes and offices due to their transparency and ease of cleaning. However, the unique properties of glass present significant technical challenges in preventing dry-boil safety, highlighting the limitations of existing solutions. (a) Traditional anti-dry-burning technology relies on a single temperature detection method, which has obvious drawbacks. Currently, most mainstream glass kettles rely solely on NTC temperature sensors for their anti-dry-boil function—the sensor probe passes through the glass kettle body and contacts the water, detecting dry-boil by monitoring water temperature changes. When dry-boiling occurs due to lack of water, the kettle body temperature rapidly exceeds 100°C, and the sensor detects the anomaly and cuts off the heating circuit. However, this solution has a key problem: Slow response: Glass has poor thermal conductivity. When the water level is too low or there is a local shortage of water, the heat must first be transferred to the sensor through the glass, resulting in a detection delay. In the event of "dry boiling with a small amount of water", the sensor may not have reacted before the glass kettle cracks due to overheating, posing a safety hazard.

[0003] (ii) Existing water level detection solutions are difficult to adapt to glass water jugs. To address the issue of single temperature detection, some manufacturers have attempted to add an additional water level detection module. However, these solutions generally suffer from compatibility problems: either they require the addition of mechanical structures or metal parts inside the kettle, compromising the transparent and aesthetically pleasing appearance of the glass kettle, or they may cause problems such as leakage and noise due to the complex structure; or the detection accuracy is easily affected by limescale, and there is even a risk of water pollution.

[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] An integrated temperature and water level detection system, comprising: The temperature detection module has a conductive detection terminal for contacting the medium being measured; The water level detection module includes a capacitive detection unit and an electrical connection terminal. The capacitive detection unit forms a capacitive detection circuit with the conductive detection terminal of the temperature detection module through the electrical connection terminal, so as to detect the water level by the change of dielectric constant of the medium. The control module is electrically connected to the temperature detection module and the water level detection module respectively, and is used to receive and process the temperature detection signal and the water level detection signal.

[0007] As a further embodiment of this utility model: the temperature detection module is an NTC temperature sensor, the NTC temperature sensor includes a metal housing, the metal housing constitutes the conductive detection terminal, and an NTC chip is encapsulated inside the metal housing.

[0008] As a further embodiment of this utility model: the capacitive detection unit includes a water level sensor body and a detection circuit. The water level sensor body is connected to an electrical connection terminal through the detection circuit. The detection circuit is used to convert the capacitance change into an electrical signal and transmit it to the control module.

[0009] This utility model also proposes an electric kettle, which includes an integrated temperature and water level detection system as described above.

[0010] As a further embodiment of this utility model: the electric kettle has a glass body and a connected base, wherein the NTC temperature sensor and the electrical connection terminal are disposed within the base, wherein: The conductive detection end of the NTC temperature sensor extends into the inner cavity of the glass pot to contact the medium to be heated, and the electrical connection terminal forms an electrical connection with the bottom of the metal casing of the NTC temperature sensor.

[0011] As a further embodiment of this utility model: the NTC temperature sensor also includes an NTC fixing nut, which is threaded onto the bottom of the metal housing. After tightening, the NTC temperature sensor can be axially locked into the mounting hole of the glass pot's inner cavity, and the upper end face of the NTC fixing nut presses the electrical connection terminal between the NTC fixing nut and the mounting surface of the corresponding mounting hole of the glass pot.

[0012] As a further embodiment of this utility model: two waterproof silicone fixing parts are fitted onto the metal shell of the NTC temperature sensor; One of the waterproof silicone fasteners is clamped between the upper end face of the glass pot mounting hole and the outer peripheral surface of the metal housing of the NTC temperature sensor; Another waterproof silicone fastener is clamped between the lower end face of the glass pot body mounting hole and the outer peripheral face of the electrical connection terminal.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This electric kettle can use a water level detection module to identify the "water present" and "water absent" states based on the difference in dielectric constant between water and air. At the same time, it combines a temperature detection module to monitor the water temperature, forming a dual judgment mechanism for dry-boil status. Both share a metal outer shell structure, eliminating the need to add redundant components inside the glass kettle. This preserves the transparency of the glass kettle while improving the response speed of the anti-dry-boil protection through accurate "water present" and "water absent" identification.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the electric kettle in this utility model; Figure 2 This is a cross-sectional structural diagram of the electric kettle in this utility model; Figure 3 yes Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the structure of the NTC temperature sensor and the electrical connection terminal in this utility model.

[0017] The reference numerals and names in the figure are as follows: 1. Conductive detection terminal; 2. Electrical connection terminal; 3. NTC temperature sensor; 4. Glass pot body; 5. Base; 6. NTC fixing nut; 7. Mounting hole; 8. Waterproof silicone fastener. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 In this embodiment of the utility model, an integrated temperature and water level detection system and an electric kettle using the system are provided. By integrating temperature detection and water level detection functions, the system solves the problems of slow response and poor adaptability of water level detection in existing glass kettles in anti-dry-boil protection.

[0020] Specifically, the integrated temperature and water level detection system consists of three parts: a temperature detection module, a water level detection module, and a control module. The temperature detection module uses an NTC temperature sensor 3, which has a metal casing containing an NTC chip. The metal casing itself forms a conductive detection terminal 1 for contacting the water to be heated. When the metal casing contacts the water, the NTC chip senses the change in water temperature and outputs a corresponding resistance signal, thereby achieving real-time detection of the water temperature and providing a basis for heating control and abnormal temperature judgment.

[0021] The water level detection module includes a capacitive detection unit and an electrical connection terminal 2. The capacitive detection unit consists of a water level sensor body and a detection circuit. The water level sensor body is electrically connected to the electrical connection terminal 2 through the detection circuit, and the electrical connection terminal 2 is electrically connected to the bottom of the metal casing of the temperature detection module, thus forming a capacitive detection circuit with the metal casing as one electrode and the water level sensor body as the other electrode. Due to the significant difference in dielectric constant between water and air (the dielectric constant of water is approximately 80, and the dielectric constant of air is approximately 1), when the water level in the kettle drops to the point where the conductive detection terminal 1 leaves the water surface (i.e., from a water-containing state to a waterless state), the medium surrounding the capacitive detection circuit changes from water to air, causing a significant change in the capacitance value of the circuit. The detection circuit can capture this change and convert it into an electrical signal, which is then transmitted to the control module, thereby achieving an accurate judgment of the "water-containing" or "waterless" state and providing a direct basis for anti-dry-boil protection.

[0022] The control module is electrically connected to both the temperature detection module and the water level detection module. After receiving the temperature and water level detection signals, it combines the information from both for comprehensive processing. For example, when the water level detection module determines that there is no water and the temperature detection module detects an abnormal temperature rise, the control module can quickly determine that it is in a dry-burning state and cut off the heating circuit.

[0023] The electric kettle using the above-mentioned detection system has a glass kettle body 4 and a connected base 5. An NTC temperature sensor 3 and an electrical connection terminal 2 are installed inside the base 5. The metal shell (conductive detection end 1) of the NTC temperature sensor 3 extends into the inner cavity of the glass kettle body 4, and its end directly contacts the water to be heated, ensuring real-time sensing of water temperature changes during heating. Simultaneously, its outer circumference and the space inside the kettle form a capacitive sensing medium environment, ensuring accurate identification of the "water present" and "water absent" states by the water level detection module.

[0024] To ensure the stable fixation and reliable electrical connection of the NTC temperature sensor 3, the NTC temperature sensor 3 also includes an NTC fixing nut 6. The outer circumferential surface of the bottom end of the metal housing has external threads, and the inner circumferential surface of the NTC fixing nut 6 has matching internal threads, allowing it to be fitted onto the bottom end of the metal housing through threaded engagement. Tightening the nut axially locks the NTC temperature sensor 3 into the mounting hole 7 of the glass pot 4, preventing displacement during water addition, pouring, or vibration, ensuring that the conductive detection end 1 is always in the preset detection position. It also presses the electrical connection terminal 2 between the nut and the corresponding mounting surface of the mounting hole 7 on the glass pot 4 through the upper end face of the nut, ensuring the continuity of conductivity in the capacitive detection circuit and preventing water level signal distortion due to poor contact.

[0025] To prevent water inside the glass vessel 4 from leaking through the mounting hole 7 into the base 5 (especially the circuit area inside the base 5), two waterproof silicone fasteners 8 are fitted onto the metal casing. One is sandwiched between the upper end face of the mounting hole 7 of the glass vessel 4 and the outer peripheral surface of the metal casing, sealing the gap between the water inside the vessel and the sensor through the elastic deformation of the silicone; the other is sandwiched between the lower end face of the mounting hole 7 and the outer peripheral surface of the electrical connection terminal 2, blocking water that may seep in along the outer periphery of the sensor and preventing it from contacting the circuit components inside the base 5. This double-sealing structure ensures that water will not interfere with the capacitive detection circuit or the circuit system when water is present, guaranteeing the stability of the "water present" and "water absent" judgments.

[0026] Through the above design, the electric kettle can use the water level detection module to identify the "water present - water absent" state by the difference in dielectric constant between water and air. At the same time, it combines the temperature detection module to monitor the water temperature, forming a dual judgment mechanism for dry burning. Both share the same metal shell structure, eliminating the need to add redundant components inside the glass kettle body 4. This preserves the transparency of the glass kettle body 4 and improves the response speed of the anti-dry burning protection through accurate "water present - water absent" identification.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A system for integrating temperature and water level detection, characterized in that, include: The temperature detection module has a conductive detection terminal for contacting the medium being measured; The water level detection module includes a capacitive detection unit and an electrical connection terminal. The capacitive detection unit forms a capacitive detection circuit with the conductive detection terminal of the temperature detection module through the electrical connection terminal, so as to detect the water level by the change of dielectric constant of the medium. The control module is electrically connected to the temperature detection module and the water level detection module respectively, and is used to receive and process the temperature detection signal and the water level detection signal.

2. The integrated temperature and water level detection system according to claim 1, characterized in that, The temperature detection module is an NTC temperature sensor, which includes a metal housing. The metal housing forms the conductive detection terminal, and an NTC chip is encapsulated inside the metal housing.

3. The integrated temperature and water level detection system according to claim 2, characterized in that, The capacitive detection unit includes a water level sensor body and a detection circuit. The water level sensor body is connected to an electrical connection terminal through the detection circuit. The detection circuit is used to convert capacitance changes into electrical signals and transmit them to the control module.

4. An electric kettle, characterized in that, The electric kettle includes the integrated temperature and water level detection system as described in claim 3.

5. An electric kettle according to claim 4, characterized in that, The electric kettle has a glass body and a connected base. The base houses the NTC temperature sensor and the electrical connection terminal, wherein: The conductive detection end of the NTC temperature sensor extends into the inner cavity of the glass pot to contact the medium to be heated, and the electrical connection terminal forms an electrical connection with the bottom of the metal casing of the NTC temperature sensor.

6. An electric kettle according to claim 5, characterized in that, The NTC temperature sensor also includes an NTC fixing nut, which is threaded onto the bottom of the metal housing. When tightened, the NTC temperature sensor is axially locked into the mounting hole in the inner cavity of the glass pot. The upper end face of the NTC fixing nut presses the electrical connection terminal between the NTC fixing nut and the mounting surface of the corresponding mounting hole in the glass pot.

7. An electric kettle according to claim 6, characterized in that, Two waterproof silicone fasteners are fitted onto the metal housing of the NTC temperature sensor; One of the waterproof silicone fasteners is clamped between the upper end face of the glass pot mounting hole and the outer peripheral surface of the metal housing of the NTC temperature sensor; Another waterproof silicone fastener is clamped between the lower end face of the glass pot body mounting hole and the outer peripheral face of the electrical connection terminal.

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