Liquid heater

Abstract

The utility model discloses a liquid heater which comprises a base and a kettle body, the kettle body is positioned on the base, the base is provided with a protruding part extending upwards, the side face, facing the center of the base, of the protruding part is provided with a through hole, a water level detection assembly for distance detection is arranged in the protruding part, and the water level detection assembly comprises a detection plate, a movable pressing plate and an elastic piece. The detection plate is fixed in the base and provided with an induction part, the elastic part is connected between the detection plate and the movable pressing plate and electrically connected with the induction part, the movable pressing plate keeps the trend of protruding out of the through hole through the elastic force of the elastic part, the kettle body is arranged on the base, and the outer side face of the kettle body is attached to the movable pressing plate. Water level changes in the kettle body cause electric signal changes of the induction piece to achieve water level detection. The utility model provides a liquid heater which has the advantage of ensuring the reliability of water level detection.

Description

Technical Field

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

[0002] In the prior art, in order to be able to obtain the water level in the kettle of the liquid heater in time, a water level detection component is set. Some water level detection components are directly in contact with water for electrical conduction to achieve detection, while others are not in contact with water for remote detection. Specifically, the detection is achieved by using the capacitance change of the sensing electrode caused by the change in water level. In the water level detection component for remote detection, in order to obtain accurate and reliable detection results, the sensing electrode is generally elastically fitted to the outer side of the kettle body. In order to protect the sensing electrode on the detection plate, a protective movable pressure plate is provided between the detection plate and the kettle body. The sensing electrode is tightly attached to the movable pressure plate, and then the movable pressure plate is fitted to the outer side of the kettle body to sense the change in the water level in the kettle body. This direct contact design can effectively obtain water level information under ideal conditions, and then trigger the corresponding signal processing mechanism. However, in actual applications, in order to reduce the impact of the movable pressure plate on the signal, the movable pressure plate is generally made of insulating plastic material, while the detection board is mostly a PCB board, forming a rigid contact method between the two, and both are prone to aging, deformation and bending. Regardless of the side of the movable pressure plate facing the detection board or the bending of the detection board, the sensing electrode sheet will not be able to fit the movable pressure plate, which will directly affect the accuracy and reliability of water level detection. Utility Model Content

[0003] The purpose to be achieved by the present utility model is to provide a liquid heater, which solves the problem of unreliable detection of a water level detection component by remote detection and ensures the reliability of water level detection.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a liquid heater, comprising a base and a kettle body, the kettle body is placed on the base for positioning, the base is provided with a protrusion extending upward, the side of the protrusion facing the center of the base is provided with a through hole, the protrusion is provided with a water level detection component for air detection, the water level detection component comprises a detection plate, a movable pressure plate and an elastic member, the detection plate is fixed in the base, the detection plate has a sensing member, the elastic member is connected between the detection plate and the movable pressure plate and is electrically conductive with the sensing member, the movable pressure plate maintains a tendency to protrude from the through hole by the elastic force of the elastic member, the kettle body is placed on the base and the outer side of the kettle body is in contact with the movable pressure plate, the water level change in the kettle body causes the electrical signal of the sensing member to change to realize water level detection.

[0005] After adopting the above technical solution, the utility model has the following advantages: a raised portion extending upward is provided on the base, and a through hole is added on the side, so that the water level detection assembly can be installed in the raised portion, which not only protects the water level detection assembly from external interference, but also ensures cooperation with the kettle body. The water level detection assembly is composed of a detection plate, a movable pressure plate and an elastic member. The elastic member is connected between the detection plate and the movable pressure plate and is electrically conductive with the sensing member. When the kettle body is placed on the base, the outer side surface of the kettle body fits and squeezes the movable pressure plate, so that the elastic member is compressed and can maintain stable contact with both the sensing member and the movable pressure plate. Since the detection plate is fixed, the elastic force of the elastic member is used to keep the movable pressure plate in contact with the outer side surface of the kettle body, thereby eliminating the problem of the inability of the sensing member to fit between the various components of the outer side surface of the kettle body. When the water level in the kettle changes, the capacitance value of the sensing member changes, and the detection board will convert it into an electrical signal and transmit it to the control circuit board of the liquid heater to realize monitoring of the water level in the kettle body, thereby improving the stability and reliability of water level monitoring.

[0006] Furthermore, the water level detection assembly also includes a fixed bracket, which is fixedly connected to the base. The movable pressure plate is movably connected to the fixed bracket to form a first installation cavity for installing the detection plate. The detection plate is fixedly connected to the fixed bracket, so that the water level detection assembly forms an integrated component.

[0007] With the aforementioned technical solution, the fixed bracket is fixed to the base to provide stable support. It is flexibly connected to the movable pressure plate to form a first mounting cavity for accommodating the detection plate. This makes the water level detection assembly a single, integrated component with a compact structure and simple installation, ensuring that the water level detection assembly does not occupy excessive space. Furthermore, this protects the detection plate and reduces external influences on the detection plate and elastic member, further ensuring the stability and reliability of water level detection.

[0008] Furthermore, the fixed bracket is provided with a first side plate extending toward the movable pressure plate, and the movable pressure plate is provided with a second side plate extending toward the fixed bracket. One of the first side plate and the second side plate is provided with a guide groove, and the other is provided with a guide rib inserted into the guide groove. The guide rib moves along the guide groove to guide the movable pressure plate to reciprocate relative to the fixed bracket.

[0009] The above-mentioned technical solution is adopted, and the first side panel and the second side panel are arranged opposite to each other, one of which is provided with a guide groove and the other is provided with a guide rib inserted into the guide groove, which is used to guide the movable pressure plate to reciprocate relative to the fixed bracket, providing a guide path for the movable pressure plate, so that the stability of the movable pressure plate during the reciprocating motion is ensured, and the deviation of the motion trajectory is avoided. The cooperation between the guide rib and the guide groove not only plays a guiding role, but also enhances the connection strength between the fixed bracket and the movable pressure plate. At the same time, the guide rib is inserted into the guide groove to realize the connection between the fixed bracket and the movable pressure plate, which is simple to assemble and reduces maintenance costs.

[0010] Furthermore, the side surface of the second side plate facing the first side plate is matched with the side surface of the first side plate facing the second side plate, further guiding the movable pressing plate to reciprocate relative to the fixed bracket.

[0011] By adopting the above-mentioned technical solution, the side surface of the second side panel is adapted to the side surface of the first side panel to strengthen the guiding effect between the first side surface and the second side surface. Through the cooperation between the surfaces, the shaking caused by the movement of the movable pressure plate is reduced, ensuring that the movable pressure plate can move smoothly along the predetermined trajectory when subjected to pressure or reset, thereby reducing deviation.

[0012] Furthermore, the second side panel is located on the inner side of the first side panel, and the height of the second side panel protruding relative to the movable pressure plate is greater than the thickness of the space required to accommodate the detection plate; or, the first side panel is located on the inner side of the second side panel, and the height of the first side panel protruding relative to the fixed bracket is greater than the thickness of the space required to accommodate the detection plate.

[0013] By adopting the above-mentioned technical solution, when the outer side surface of the kettle body is in contact with the movable pressure plate, when the movable pressure plate moves to the end of its stroke, the second side plate will preferentially abut against the fixed bracket or the first side plate will preferentially abut against the movable pressure plate, and the movable pressure plate and the fixed bracket will no longer be close to each other, ensuring that the space of the first installation cavity will not continue to shrink, thereby avoiding excessive movement of the movable pressure plate and causing the detection plate to be crushed.

[0014] Furthermore, the base is provided with a heating plate for heating the kettle body, a through hole is provided in the central area of the heating plate, a temperature measuring component is provided in the base, the temperature measuring component is elastically connected to the base and maintains a tendency to protrude upward from the through hole, a micro switch that is kept normally open is provided in the base below the temperature measuring component, the micro switch is electrically connected to the working circuit of the heating plate, the spring of the micro switch is located on the movement path of the temperature measuring component, the kettle body is placed on the base and the temperature measuring component is pressed down to push the spring of the micro switch, so that the micro switch is closed and the heating plate is in an operable state.

[0015] By adopting the above-mentioned technical solution, the temperature measuring component is elastically connected to the base so that it can maintain a tendency to protrude upward through the hole. When the kettle body is placed on the base, it fits tightly with the temperature measuring component, and the temperature measurement is more accurate. When the kettle body is removed from the base, due to the elastic force of the elastic connection, the temperature measuring component can again maintain a tendency to protrude upward through the hole. The spring piece of the microswitch is arranged below the temperature measuring component. When the kettle body leaves the base, the microswitch remains in a normally open state, and the heating plate does not heat up. The microswitch is placed on the movement path of the temperature measuring component. When the kettle body is placed on the base, the temperature measuring component is pressed down and the spring piece of the microswitch is pushed to close the microswitch. The heating plate can start working to heat the kettle body. Through the cooperation of the temperature measuring component and the microswitch, it is ensured that the heating plate will not heat up by itself when the kettle body is not placed or is not placed correctly on the base, thereby avoiding the safety hazard of empty burning.

[0016] Furthermore, the micro switch is installed horizontally below the temperature measuring component, the spring of the micro switch extends upward at an angle and the movable end of the spring is located on the movement path of the temperature measuring component, and the temperature measuring component moves downward to close the movable end of the spring and the contact.

[0017] By adopting the above-mentioned technical solution, the micro switch is installed horizontally below the temperature measuring component, and the spring is designed to extend obliquely upward to be located on the movement path of the temperature measuring component. When the temperature measuring component is forced to move downward along the through hole, it will directly contact the active end of the spring, allowing the active end of the spring to obtain a sufficiently long movement stroke so that the active end of the spring and the contact are closed. Long-term use can also ensure the reliability of the closure of the active end of the spring and the contact, thereby improving the accuracy and reliability of the on-off changes of the micro switch.

[0018] Furthermore, the temperature measuring component includes an NTC probe and a movable bracket, the NTC probe is fixed to the top of the movable bracket, the movable bracket is elastically connected to the base, and the bottom end of the movable bracket acts on the spring of the micro switch.

[0019] Using this technical solution, the NTC probe is fixed to the top of the movable bracket, accurately measuring the temperature of the kettle body. By applying the bottom of the movable bracket to the spring of the microswitch, a linkage triggering mechanism is established between the temperature measurement component and the microswitch. When the kettle body is placed on the base, downward pressure is generated, automatically turning on the microswitch. The elastic connection of the movable bracket allows the kettle body to return to its original position after leaving the base, ensuring the flexibility of the temperature measurement component.

[0020] Furthermore, an installation bracket is provided in the base, and the installation bracket is provided with a second installation cavity for installing the temperature measuring component. The movable bracket is elastically connected to the second installation cavity. A deformable waterproof cover is provided between the top of the second installation cavity and the movable bracket, and the NTC probe is exposed on the top surface of the waterproof cover.

[0021] Using the above-mentioned technical solution, a deformable waterproof cover is provided at the top of the second mounting cavity to prevent liquid from entering the second mounting cavity and protect the electronic components inside the temperature measuring assembly from damage. The deformable characteristics of the waterproof cover allow it to maintain a seal with the movable bracket when the movable bracket moves, without affecting the normal exposure of the NTC probe. The NTC probe is directly fixed to the top of the movable bracket and exposed on the top surface of the waterproof cover, ensuring that the NTC probe can directly contact the kettle body, thereby accurately measuring the temperature.

[0022] Furthermore, a radially protruding first annular rib is provided on the top periphery of the NTC probe, and a radially protruding second annular rib is provided on the bottom periphery. The first annular rib and the second annular rib respectively abut against the waterproof cover and the movable bracket to clamp and fix the two.

[0023] Using the above-mentioned technical solution, the first ring rib and the second ring rib provide a fixing part for the NTC probe. When the NTC probe is installed in the second mounting cavity, the first ring rib abuts against the top surface of the waterproof cover, and the second ring rib abuts against the movable bracket and is fixed and clamped by the two, thereby enhancing the stability of the NTC probe in the mounting bracket and improving the overall fixing effect. The first ring rib directly abuts against the top surface of the waterproof cover, forming a tighter seal between the NTC probe and the waterproof cover, reducing the possibility of external liquid seeping into the second mounting cavity through the gap, and further improving the waterproof performance. During use, the kettle body may be affected by external forces. The first ring rib and the second ring rib help to reduce the looseness between the NTC probe, the waterproof cover and the movable bracket and the resulting poor contact. At the same time, it is simple to install and easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the base of the utility model;

[0026] Figure 2 It is a partial schematic diagram of the base of the utility model;

[0027] Figure 3 This is an exploded view of the water level detection assembly of the utility model;

[0028] Figure 4 It is a schematic diagram of installing a micro switch in the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0030] The terms "first," "second," and so on (if any) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or precedence. Even if "second" is used before a technical feature to distinguish it, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. It should be understood that in this utility model, "plurality" refers to two or more. "And / or" is merely a description of an association between related objects, indicating that three relationships can exist. For example, "X and / or Y" can mean: X exists alone, X and Y exist simultaneously, or Y exists alone. The character " / " generally indicates that the related objects are in an "or" relationship. "Including X, Y, and Z" means that all three of X, Y, and Z are included. "Including X, Y, or Z" means that one of X, Y, and Z is included. "Including X, Y, and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0031] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0032] like Figure 1 、 Figure 2 and Figure 3 As shown, a liquid heater includes a base 1 and a kettle body, the kettle body is placed on the base 1 for positioning, the base 1 is provided with a raised portion 2 extending upward, the raised portion 2 is provided with a through hole 21 on the side facing the center of the base 1, and a water level detection component 22 for air detection is provided in the raised portion 2, the water level detection component 22 includes a detection plate 221, a movable pressure plate 222 and an elastic member 223, the detection plate 221 is fixed in the base 1, the detection plate 221 has a sensing member, the elastic member 223 is connected between the detection plate 221 and the movable pressure plate 222 and is electrically conductive with the sensing member, the movable pressure plate 222 maintains a tendency to protrude from the through hole 21 by the elastic force of the elastic member 223, the kettle body is placed on the base 1 and the outer side of the kettle body is in contact with the movable pressure plate 222, the water level change in the kettle body causes the electrical signal of the sensing member to change to realize water level detection.

[0033] The base 1 is provided with a raised portion 2 extending upward, and a through hole 21 is added to the side so that the water level detection component 22 can be installed in the raised portion 2, which not only protects the water level detection component 22 from external interference, but also ensures the cooperation with the kettle body. The water level detection component 22 is composed of a detection plate 221, a movable pressure plate 222 and an elastic member 223. The elastic member 223 is connected between the detection plate 221 and the movable pressure plate 222 and is electrically conductive with the sensing member. When the kettle body is placed on the base 1, the outer side of the kettle body is attached to and squeezes the movable pressure plate 222, so that the elastic member 2 23 is compressed and can maintain stable contact with the sensing member and the movable pressure plate 222. Since the detection plate 221 is fixed, the elastic force of the elastic member 223 is used to keep the movable pressure plate 222 in contact with the outer side of the kettle body, thereby eliminating the problem of the sensing member not being able to fit the various components on the outer side of the kettle body. When the water level in the kettle changes and causes the capacitance value of the sensing member to change, the detection board 221 will convert it into an electrical signal and transmit it to the control circuit board of the liquid heater to realize the monitoring of the water level in the kettle body, thereby improving the stability and reliability of water level monitoring.

[0034] In this embodiment, using water as a reference, the dielectric constant of water is much greater than that of air. Therefore, when the water level rises, the ratio of water to air within the kettle changes, causing the dielectric constant of the entire capacitor structure to increase, and thus the capacitance value to increase. Conversely, when the water level drops, the capacitance value decreases. This change in capacitance value is captured by the sensing element on the detection board 221 and converted into an electrical signal. Subsequent circuit processing enables real-time monitoring and display of the water level.

[0035] Optionally, the kettle body can be made of glass or other materials, and the base 1 and the movable pressure plate 222 can be made of high-temperature resistant, corrosion-resistant, and insulating hard plastic materials, such as PES, PPS, etc. The detection plate 221 has a sensing part, and the sensing part can refer to the sensing unit in the prior art CN104535135A. The elastic part 223 is a metal spring or a metal shrapnel.

[0036] The water level detection assembly 22 also includes a fixed bracket 225, which is fixedly connected to the base 1. The movable pressure plate 222 is movably connected to the fixed bracket 225 to form a first installation cavity 226 for installing the detection plate 221. The detection plate 221 is fixedly connected to the fixed bracket 225, so that the water level detection assembly 22 forms an integrated component.

[0037] The fixing bracket 225 can be fixed to the base 1 by bolts or clamping, providing stable support. It is movably connected to the movable pressure plate 222 to form a first mounting cavity 226 for accommodating the detection plate 221. This makes the water level detection assembly 22 an integrated component with a compact structure and simple installation, ensuring that the water level detection assembly 22 does not occupy excessive space. Furthermore, this protects the detection plate 221 and reduces external influences on the detection plate and elastic member 223, thereby further ensuring the stability and reliability of water level detection.

[0038] The fixed bracket 225 is provided with a first side plate 227 extending toward the movable pressing plate 222 , and the movable pressing plate 222 is provided with a second side plate 228 extending toward the fixed bracket 225 .

[0039] In one embodiment, the first side plate 227 is provided with a guide groove 2271 , and the second side plate 228 is provided with a guide rib 2281 inserted into the guide groove 2271 . The guide rib 2281 moves along the guide groove 2271 to guide the movable pressing plate 222 to reciprocate relative to the fixed bracket 225 .

[0040] In another embodiment, the second side plate 228 is provided with a guide groove 2271 , and the first side plate 227 is provided with a guide rib 2281 inserted into the guide groove 2271 . The guide rib 2281 moves along the guide groove 2271 to guide the movable pressure plate 222 to reciprocate relative to the fixed bracket 225 .

[0041] The first side plate 227 and the second side plate 228 are arranged opposite to each other, and the cooperation of the guide rib 2281 and the guide groove 2271 is used to guide the movable pressure plate 222 to reciprocate relative to the fixed bracket 225, providing a guide path for the movable pressure plate 222, so that the movable pressure plate 222 is stable during the reciprocating motion and avoids the deviation of the motion trajectory. It not only plays a guiding role, but also enhances the connection strength between the fixed bracket 225 and the movable pressure plate 222. At the same time, by inserting the guide rib 2281 into the guide groove 2271 to realize the connection between the fixed bracket 225 and the movable pressure plate 222, the assembly is simple and the maintenance cost is reduced.

[0042] Furthermore, the side surface of the second side plate 228 facing the first side plate 227 is matched with the side surface of the first side plate 227 facing the second side plate 228, further guiding the movable pressure plate 222 to reciprocate relative to the fixed bracket 225. The side surface of the second side plate 228 is matched with the side surface of the first side plate 227 to strengthen the guiding effect between the first side surface and the second side surface. Through the cooperation between the surfaces, the shaking of the movable pressure plate 222 is reduced, ensuring that the movable pressure plate 222 can move smoothly along the predetermined trajectory when subjected to pressure or reset, thereby reducing deviation.

[0043] In one embodiment, the second side plate 228 is located on the inner side of the first side plate 227 , and the height of the second side plate 228 protruding relative to the movable pressing plate 222 is greater than the thickness of the space required to accommodate the detection plate 221 .

[0044] In another embodiment, the first side plate 227 is located on the inner side of the second side plate 228 , and the height of the first side plate 227 protruding relative to the fixing bracket 225 is greater than the thickness of the space required to accommodate the detection board 221 .

[0045] It can be seen from the above embodiments that when the outer side surface of the kettle body is in contact with the movable pressure plate 222, when the movable pressure plate 222 moves to the end of its stroke, the second side plate 228 will preferentially abut against the fixed bracket 225 or the first side plate 227 will preferentially abut against the movable pressure plate 222, and the movable pressure plate 222 and the fixed bracket 225 will no longer be close to each other, ensuring that the space of the first installation cavity will not continue to shrink, thereby avoiding excessive movement of the movable pressure plate 222 and causing the detection plate 221 to be crushed.

[0046] like Figure 4 As shown, the base 1 is provided with a heating plate 12 for heating the kettle body, and a through hole 121 is provided in the central area of the heating plate 12. A temperature measuring component 13 is provided in the base 1. The temperature measuring component 13 is elastically connected to the base 1 and maintains a tendency to protrude upward from the through hole 121. A micro switch 14 that is kept normally open is provided below the temperature measuring component 13 in the base 1. The micro switch 14 is electrically connected to the working circuit of the heating plate 12. The spring piece 141 of the micro switch 14 is located on the movement path of the temperature measuring component 13. The kettle body is placed on the base 1 and the temperature measuring component 13 is pressed down to push the spring piece 141 of the micro switch 14, so that the micro switch 14 is closed and the heating plate 12 is in an operable state.

[0047] The temperature measuring component 13 is elastically connected to the base 1 so that it can maintain a tendency to protrude upward from the through hole 121. When the kettle body is placed on the base 1, it fits tightly with the temperature measuring component 13, and the temperature measurement is more accurate. When the kettle body is taken off the base 1, due to the elastic force of the elastic connection, the temperature measuring component 13 can maintain a tendency to protrude upward from the through hole 121 again. The spring piece 141 of the micro switch 14 is arranged below the temperature measuring component 13. When the kettle body leaves the base 1, the micro switch 14 remains in the normally open state, and the heating plate 12 does not heat up. The micro switch 14 is placed in the movement path of the temperature measuring component 13. When the kettle body is placed on the base 1, the temperature measuring component 13 is pressed down and the spring piece 141 of the micro switch 14 is pushed to close the micro switch 14, and the heating plate 12 can start working to heat the kettle body. The cooperation between the temperature measuring component 13 and the micro switch 14 ensures that the heating plate 12 will not heat up by itself when the kettle body is not placed or is not placed correctly on the base 1, thereby avoiding dry burning and causing safety hazards.

[0048] Preferably, the heating plate is sunken relative to the top of the base, so that a receiving groove for accommodating the kettle body is formed between the top of the base and the heating plate, and the protrusion 2 is located at the edge of the receiving groove. The receiving groove can not only limit the kettle body and improve the stability of the kettle body after placement, but also help the outer side of the kettle body to fit more reliably with the movable pressure plate.

[0049] The micro switch 14 is installed horizontally below the temperature measuring component 13. The spring 141 of the micro switch 14 extends upward at an angle and the movable end of the spring 141 is located on the movement path of the temperature measuring component 13. The temperature measuring component 13 moves downward to close the movable end of the spring 141 and the contact.

[0050] By installing the micro switch 14 horizontally below the temperature measuring component 13 and designing the spring 141 to extend obliquely upward to be located on the movement path of the temperature measuring component 13, when the temperature measuring component 13 is forced to move downward along the through hole 121, it will directly contact the movable end of the spring 141, allowing the movable end of the spring 141 to obtain a sufficiently long movement stroke, so that the spring 141 and the contact are closed. The reliability of the closure of the movable end of the spring 141 and the contact can be ensured even after long-term use, thereby improving the accuracy and reliability of the on-off change of the micro switch 14.

[0051] The micro switch 14 is installed horizontally below the temperature measuring component 13. The spring 141 of the micro switch 14 extends upward at an angle and the movable end of the spring 141 is located on the movement path of the temperature measuring component 13. The temperature measuring component 13 moves downward to close the movable end of the spring 141 and the contact.

[0052] By installing the micro switch 14 horizontally below the temperature measuring component 13 and designing the spring 141 to extend obliquely upward to be located on the movement path of the temperature measuring component 13, when the temperature measuring component 13 is forced to move downward along the through hole 121, it will directly contact the movable end of the spring 141, causing the movable end and the contact to close. This closing action triggers the micro switch 14, causing it to change from an open state to a closed state, generating an electrical signal, thereby improving the accuracy and reliability of the system. The micro switch 14 includes a body 142, a spring 141, and a switch bracket for fixing the body 142. The temperature measuring component 13 includes an NTC probe 131 and a movable bracket 132. The NTC probe 131 is fixed to the top of the movable bracket 132. The movable bracket 132 is elastically connected to the base 1. The bottom end of the movable bracket 132 acts on the spring 141 of the micro switch 14.

[0053] The NTC probe 131 is fixed to the top of the movable bracket 132 and can accurately measure the temperature of the kettle body. By applying the bottom end of the movable bracket 132 to the spring 141 of the microswitch 14, a linkage triggering mechanism is implemented between the temperature measurement component 13 and the microswitch 14. When the kettle body is placed on the base 1, downward pressure is generated, which activates the microswitch 14. The movable bracket 132 is elastically connected to the base 1 via a spring, allowing the kettle body to return to its original position after leaving the base 1, ensuring the flexibility of the temperature measurement component 13.

[0054] A mounting bracket 15 is provided in the base 1, and the mounting bracket 15 is provided with a second mounting cavity 16 for installing the temperature measuring component 13. The movable bracket 132 is elastically connected to the second mounting cavity 16. A deformable waterproof cover 17 is provided between the top of the second mounting cavity 16 and the movable bracket 132, and the NTC probe 131 is exposed on the top surface of the waterproof cover 17.

[0055] A deformable waterproof cover 17 is provided at the top of the second mounting cavity 16 to prevent liquid from entering the second mounting cavity 16 and protect the electronic components inside the temperature measuring assembly 13 from damage. The deformable property of the waterproof cover 17 allows it to maintain a seal with the movable bracket 132 when the movable bracket 132 moves, while not affecting the normal exposure of the NTC probe 131. The NTC probe 131 is directly fixed to the top of the movable bracket 132 and exposed on the top surface of the waterproof cover 17, ensuring that the NTC probe 131 can directly contact the kettle body, thereby accurately measuring the temperature.

[0056] In this embodiment, the deformable waterproof cover 17 is made of silicone material, and in other embodiments, rubber material or the like may also be used.

[0057] The top periphery of the NTC probe 131 is provided with a radially protruding first annular rib 1311 and the bottom periphery is provided with a radially protruding second annular rib 1312. The first annular rib 1311 and the second annular rib 1312 respectively abut against the waterproof cover 17 and the movable bracket 132 to clamp and fix them.

[0058] The first annular rib 1311 and the second annular rib 1312 provide a fixing portion for the NTC probe 131. When the NTC probe 131 is installed in the second mounting cavity 16, the first annular rib 1311 abuts against the top surface of the waterproof cover 17, and the second annular rib 1312 abuts against the movable bracket 132 and is fixed and clamped by the two, thereby enhancing the stability of the NTC probe 131 in the mounting bracket 15 and improving the overall fixing effect. The first annular rib 1311 directly abuts against the top surface of the waterproof cover 17, forming a tighter seal between the NTC probe 131 and the waterproof cover 17, reducing the possibility of external liquid seeping into the second mounting cavity 16 through the gap, and further improving the waterproof performance. During use, the kettle body may be affected by external forces. The first annular rib 1311 and the second annular rib 1312 help to reduce the looseness between the NTC probe 131, the waterproof cover 17 and the movable bracket 132 and the resulting poor contact. At the same time, it is simple to install and easy to disassemble.

[0059] Optionally, ventilation holes 18 are provided on the outer wall of the base 1 to dissipate heat from the electrical components placed in the base 1, and supporting feet 19 are provided at the bottom of the base 1 to prevent the outer bottom surface of the base from directly contacting the table where the machine is placed.

[0060] As can be seen from the above embodiments, the temperature measurement component 13 and the water level detection component 22 generally work in conjunction. When the water level is normal and the water temperature has not reached the set value, the power is connected, and the heating plate 12 heats the water in the kettle to the set temperature. When the water level is too low, the sensor triggers the control circuit, causing the heating element to stop working. Specifically, when the water level is too low, the water level detection component 22 first detects the change in capacitance of the sensor and sends a water level signal to the control circuit. Upon receiving the water level signal, the control circuit immediately cuts off the power to the heating element, thereby preventing dangerous situations such as dry boiling. At the same time, if the water temperature reaches the set value when the water level is normal, the temperature measurement component 13 will also send a signal to the control circuit to stop heating.

[0061] In addition to the above-mentioned preferred embodiments, the present invention has other implementation methods. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A liquid heater, comprising a base and a kettle body, wherein the kettle body is positioned on the base, characterized in that: The base is provided with an upwardly extending protrusion, and a through hole is provided on the side of the protrusion facing the center of the base. A water level detection component for air detection is provided in the protrusion, and the water level detection component includes a detection plate, a movable pressure plate and an elastic member. The detection plate is fixed in the base, and the detection plate has a sensing member. The elastic member is connected between the detection plate and the movable pressure plate and is electrically conductive with the sensing member. The movable pressure plate maintains a tendency to protrude from the through hole by the elastic force of the elastic member. The kettle body is placed on the base and the outer side of the kettle body is in contact with the movable pressure plate. Changes in the water level in the kettle body cause changes in the electrical signal of the sensing member to realize water level detection.

2. The liquid heater according to claim 1, characterized in that The water level detection assembly also includes a fixed bracket, which is fixedly connected to the base. The movable pressure plate is movably connected to the fixed bracket to form a first installation cavity for installing the detection plate. The detection plate is fixedly connected to the fixed bracket, so that the water level detection assembly forms an integrated component.

3. The liquid heater according to claim 2, characterized in that The fixed bracket is provided with a first side plate extending toward the movable pressure plate, and the movable pressure plate is provided with a second side plate extending toward the fixed bracket. One of the first side plate and the second side plate is provided with a guide groove, and the other is provided with a guide rib inserted into the guide groove. The guide rib moves along the guide groove to guide the movable pressure plate to reciprocate relative to the fixed bracket.

4. The liquid heater according to claim 3, characterized in that The side surface of the second side plate facing the first side plate is adapted to the side surface of the first side plate facing the second side plate, further guiding the movable pressing plate to reciprocate relative to the fixed bracket.

5. The liquid heater according to claim 3, characterized in that The second side panel is located on the inner side of the first side panel, and the height of the second side panel protruding relative to the movable pressure plate is greater than the thickness of the space required to accommodate the detection plate; or, the first side panel is located on the inner side of the second side panel, and the height of the first side panel protruding relative to the fixed bracket is greater than the thickness of the space required to accommodate the detection plate.

6. The liquid heater according to claim 1, wherein The base is provided with a heating plate for heating the kettle body, a through hole is provided in the central area of the heating plate, a temperature measuring component is provided in the base, the temperature measuring component is elastically connected to the base and maintains a tendency to protrude upward from the through hole, a micro switch that is kept normally open is provided in the base below the temperature measuring component, the micro switch is electrically connected to the working circuit of the heating plate, a spring of the micro switch is located on the movement path of the temperature measuring component, the kettle body is placed on the base and the temperature measuring component is pressed down to push the spring of the micro switch, so that the micro switch is closed and the heating plate is in an operational state.

7. The liquid heater according to claim 6, characterized in that The micro switch is installed horizontally below the temperature measuring component. The spring of the micro switch extends upward at an angle and the movable end of the spring is located on the movement path of the temperature measuring component. The temperature measuring component moves downward to close the movable end of the spring and the contact.

8. The liquid heater according to claim 6, characterized in that The temperature measuring component includes an NTC probe and a movable bracket. The NTC probe is fixed to the top of the movable bracket. The movable bracket is elastically connected to the base. The bottom end of the movable bracket acts on the spring of the micro switch.

9. The liquid heater according to claim 8, characterized in that A mounting bracket is provided in the base, and the mounting bracket is provided with a second mounting cavity for installing the temperature measuring component. The movable bracket is elastically connected to the second mounting cavity. A deformable waterproof cover is provided between the top of the second mounting cavity and the movable bracket, and the NTC probe is exposed on the top surface of the waterproof cover.

10. The liquid heater according to claim 9, characterized in that The top periphery of the NTC probe is provided with a radially protruding first annular rib, and the bottom periphery is provided with a radially protruding second annular rib. The first annular rib and the second annular rib respectively abut against the waterproof cover and the movable bracket to clamp and fix the two.

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