Liquid heater

Abstract

The utility model provides a liquid heater, and relates to a liquid heater, the liquid heater comprises a glass inner container, the glass inner container comprises an arc-shaped outer wall extending along the height direction, and a shell fixedly attached to the arc-shaped outer wall, a plurality of mounting grooves which are arranged at intervals in the height direction of the arc-shaped outer wall are formed in the side, facing the glass inner container, of the shell, the liquid level detection device further comprises a control panel and a plurality of rigid capacitor pole pieces, the capacitor pole pieces are installed in the mounting grooves in a one-to-one correspondence mode to form the liquid level detection device, and the capacitor pole pieces are electrically connected to the control panel. The liquid heater is used for solving the technical problems that in the prior art, a soft PFB plate can only be attached to the arc-shaped outer wall to conduct liquid level detection on the arc-shaped surface, so that installation is not reliable, and installation and positioning are difficult.

Description

Technical Field

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

[0002] The prior art CN97225228.2 discloses a liquid level sensor that can detect the liquid level position of milk without contacting the milk. The scheme particularly emphasizes that this liquid level sensor is suitable for all other non-metallic containers that require contactless liquid level control, because conductive metal containers will interfere with the induction of the liquid level sensor and affect the detection effect of the actual liquid level.

[0003] In order to further simplify the non-contact capacitive liquid level detection device, the prior art discloses a capacitive water level stepless detection device, including a capacitive slider formed by a number of equidistantly arranged capacitive sensors, and the capacitive slider is connected to a chip through an induction line, and the chip is connected to a central processing unit through a signal line, and the central processing unit is connected to a water level display. When working, under the control of the chip, the data detected by the capacitive sensor is transmitted to the central processing unit, and the central processing unit processes the received data and transmits it to the water level display to display the current water level. The structure is simple, and the stepless detection of the water level can be realized. In addition, the detection method is not affected by the water temperature, and can effectively avoid the parasitic characteristics caused by the change of the detection environment and other factors such as the water temperature, which leads to the problem of inaccurate water level detection. The inventor has found that for this scheme, although the signal induction detection of water has a high accuracy, for the detection of water or other liquid substances in non-liquid shape, such as bubbles, foams, slurry substances such as slurry substances, on the one hand, due to the poor conductivity of the above substances, the capacitive sensor senses a small change in capacitance value, and the chip cannot distinguish whether it is a liquid level signal or a parasitic capacitance. On the other hand, when the liquid produces bubbles, foam, slurry, especially slurry foam, there will be a thicker slurry layer above the liquid surface. In addition, due to the presence of foam in the slurry layer, the slurry will be blocked from contacting the cup wall, resulting in a distance gap between the slurry and the cup wall, affecting the capacitance value sensed by the capacitive sensor. Moreover, the surface of the slurry layer is not flat. Generally, the slurry in the center of the cup body is higher, while the slurry in contact with the cup wall is lower, and even the height of the slurry in contact with different positions of the cup wall is different. The capacitive sensor may not be able to sense the specific capacitance value or the sensed capacitance value is small. Therefore, the chip cannot identify the specific position of the liquid level, which is prone to overflow safety risks. Therefore, this solution is generally suitable for water level signal detection of health pots, etc.

[0004] Prior art CN201610753199.4 also discloses an anti-overflow method and a food processor, on which a signal PCB board is installed, and metal sheets of the same size are equidistantly arranged on the signal PCB board. When the volume of the liquid level in the cup body gradually increases, the capacitance formed by the metal sheet and the liquid in the cup body will increase, thereby realizing the detection of the water level signal and the anti-overflow signal by sensing the liquid level using the metal sheet. However, the anti-overflow detection position of this scheme is the highest fixed position located on the PCB board. In actual use, the metal sheet below the anti-overflow detection position can recognize the water level signal. However, based on the characteristics of slurry foam and slurry foam, the fixed anti-overflow detection position is greatly affected by external parasitic capacitance and cannot accurately identify the anti-overflow signal of the slurry. At the same time, since the surface of the slurry foam is not flat, the fixed anti-overflow detection position may cause the detected anti-overflow position to deviate greatly from the actual slurry foam position, and there is a safety risk of overflow. The prior art PCB board is a continuous flat strip structure, which is longitudinally installed on the outer wall of the inverted cone-shaped cup body. The contact surface between the flat strip PCB board and the outer wall of the cup body is a straight line (or an inclined straight line) in the height direction.

[0005] In order to improve product experience and aesthetics, many liquid heaters currently on the market have an inner tank with an arc-shaped outer wall extending in the height direction, and the arc-shaped outer wall is a curve in the height direction.

[0006] However, the shape of the existing continuous flat strip PCB does not match the curved outer wall of the liquid heater, and the PCB itself cannot be bent, which makes it difficult to install the flat PCB and difficult to fit the PCB better. Even after it is barely installed, the area of ​​the rigid strip PCB close to the curved outer wall is very small (relative to its own length), which further reduces the detection range of the rigid strip PCB.

[0007] In the case where the liquid heater has an arc-shaped outer wall extending in the height direction, in order to solve the above technical problems, the prior art CN201921962352.X discloses a capacitive continuous liquid level detection structure and an electric kettle thereof, which discloses that a soft PFB board is installed on the outer wall of the kettle body by pasting.

[0008] The applicant has found that the production cost of soft PFB boards is high, and the manufacturing of glass liner and soft PFB boards is difficult to be consistent, and the two are more difficult to match. The production volume of liquid heaters is often millions to tens of millions of units, and soft PFB boards are difficult to be industrially feasible.

[0009] The flexible sensing electrode sheet is connected to the curved outer wall of the kettle body through adhesive material. The adhesive material may age after long-term exposure to high temperature, resulting in decreased adhesion, which makes the connection between the soft PFB board and the kettle body loose or completely fall off. Therefore, the installation connection between the flexible sensing electrode sheet and the curved outer wall of the kettle body is not reliable. Since liquid heaters such as electric kettles will experience thermal expansion and contraction during heating and cooling, this temperature change may cause stress on the bonding interface, further affecting the stability of the bonding, resulting in the inability to stably install the flexible sensing electrode sheet on the curved outer wall of the kettle body. Even a small displacement may seriously affect the accuracy of liquid level detection. Utility Model Content

[0010] The utility model aims to provide a liquid heater to solve the problems in the prior art in which the liquid heater has a glass inner container and adopts an arc-shaped outer wall extending in the height direction, whether a rigid PCB board or a flexible PFB board is used.

[0011] The embodiment of the present application provides a liquid heater, comprising a glass liner, wherein the glass liner comprises an arc-shaped outer wall extending in a height direction, and a shell body fixedly attached to the arc-shaped outer wall;

[0012] A plurality of mounting grooves are arranged at intervals along the height direction of the arc-shaped outer wall on one side of the shell facing the glass liner;

[0013] It also includes a control board and a plurality of rigid capacitor electrodes, wherein the plurality of capacitor electrodes are installed in a plurality of installation grooves one by one to form a liquid level detection device, and the capacitor electrodes are electrically connected to the control board respectively.

[0014] In some embodiments of the utility model, an elastic member is provided in a single installation groove, and after the shell is installed on the arc-shaped outer wall of the glass liner, the elastic member presses the capacitor electrode against the outer wall surface of the glass liner.

[0015] In some embodiments of the present invention, the elastic member is a silicone member or a spring.

[0016] In some embodiments of the present invention, the elastic member is connected to the capacitor electrode by adhesive.

[0017] In some embodiments of the present invention, the elastic member is connected to the bottom surface of the mounting groove by adhesive.

[0018] In some embodiments of the present invention, the multiple capacitor electrodes include multiple first capacitor electrodes and multiple second capacitor electrodes, the height of a single second capacitor electrode is greater than the height of a single first capacitor electrode, the multiple second capacitor electrodes together form an anti-overflow detection area, and the multiple first capacitor electrodes together form a water level detection area, and the above-mentioned anti-overflow detection area is arranged on the upper side of the above-mentioned water level detection area.

[0019] In some embodiments of the utility model, the second capacitor electrode is provided with a dividing groove, which divides the overflow prevention detection area into a first sub-overflow prevention detection area and a second sub-overflow prevention detection area arranged side by side, and the first sub-overflow prevention detection area and the second sub-overflow prevention detection area are electrically connected to the control board respectively, wherein, at the same liquid level height below the highest point of the overflow prevention detection area, the sensing area of ​​the first sub-overflow prevention detection area is not equal to the sensing area of ​​the second sub-overflow prevention detection area.

[0020] In some embodiments of the present invention, a plurality of limit blocks are provided on one side of the shell facing the arc-shaped outer wall, and two adjacent installation grooves are isolated by the limit blocks.

[0021] In some embodiments of the utility model, the control board is installed below the glass inner tank, a wiring groove is provided on the shell, and the wiring groove is located outside the installation groove, and the capacitor electrode is provided with a wire electrically connected to the control board, and the wire is arranged in the wiring groove.

[0022] In some embodiments of the present utility model, the housing includes a mounting plate, and the mounting slot is disposed on the mounting plate;

[0023] Alternatively, the housing includes a handle, and the mounting groove is arranged on the handle.

[0024] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0025] In this embodiment, the capacitor pole pieces are arranged in sections, so that the rigid capacitor pole pieces can be installed on the curved surface.

[0026] Flexible connectors such as flexible circuit boards or flexible wires can be used between the capacitor electrode and the control board to achieve electrical connection. By placing these flexible connectors at the connection of the capacitor electrode, it is beneficial for the entire liquid level detection device to adapt to the curved outer wall while maintaining the continuity of the circuit. This avoids the problem in the prior art that the rigid long strip PCB board does not match the shape of the curved outer wall, resulting in difficulty in installation and a small detection area.

[0027] The capacitor electrode is installed and fixed through the mounting groove. Compared with the installation method of the prior art, it is not easy to fall off and age, and the position of the capacitor electrode will not change with long-term use.

[0028] The capacitor electrode is installed in the installation groove. Compared with the existing technology, the groove structure can better fix the capacitor electrode. There is no need to worry about the installation failure of the capacitor electrode due to aging in a high temperature environment. This ensures the reliability of the capacitor electrode installation and improves the accuracy of liquid level detection.

[0029] Furthermore, the mounting groove is provided on the shell, and the capacitor electrode does not need to be directly installed on the curved outer wall. The capacitor electrode is less affected by temperature changes, and there is no need to worry about the capacitor electrode being displaced or falling off during long-term hot and cold changes, thereby ensuring the reliability of the capacitor electrode installation and improving the accuracy of liquid level detection.

[0030] The rigid capacitor electrode is not easily twisted or deformed during installation, and the rigid capacitor electrode and the mounting groove can achieve higher precision installation and positioning.

[0031] In the prior art, the capacitor electrode is positioned and installed based on the curved outer wall, and the positioning and installation accuracy of the curved glass surface is low. In this embodiment, the mounting groove is processed on the shell, and the positioning reference of the mounting groove is the shell. The positioning and installation of the mounting groove and the capacitor electrode are more accurate, ensuring the liquid level detection accuracy of the capacitor electrode.

[0032] In addition, each capacitor electrode can be independently manufactured and tested before being installed in the mounting slot, which can improve production efficiency, simplify the troubleshooting process, and allow for more flexible installation methods during the production and installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the shell and the glass liner in the embodiment of the present application.

[0034] Figure 2 It is a schematic diagram of the structure in which the elastic member of the embodiment of the present application presses the capacitor electrode tightly against the glass liner.

[0035] Figure 3 It is a structural schematic diagram of the coordination between the capacitor electrode and the control board in an embodiment of the present application.

[0036] Figure 4 It is a schematic diagram of the structure of the first sub-overflow prevention detection area and the second sub-overflow prevention detection area in an embodiment of the present application.

[0037] Icon: 1-glass liner, 2-shell, 201-installation slot, 211-limiting block, 202-elastic member, 3-capacitor electrode, 301-first capacitor electrode, 302-second capacitor electrode, 321-first sub-overflow detection area, 322-second sub-overflow detection area, 4-control board. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Embodiment 1

[0040] like Figure 1-4 As shown, it includes a glass inner liner 1, wherein the glass inner liner 1 includes an arc-shaped outer wall extending along the height direction, and a shell 2 fixedly fitted with the arc-shaped outer wall.

[0041] A plurality of mounting grooves 201 arranged at intervals along the height direction of the arc-shaped outer wall are provided on one side of the housing 2 facing the glass liner 1 .

[0042] It also includes a control board 4 and a plurality of rigid capacitor electrodes 3. The plurality of capacitor electrodes 3 are installed one by one in a plurality of installation grooves 201 to form a liquid level detection device. The capacitor electrodes 3 are electrically connected to the control board 4 respectively.

[0043] In this embodiment, after the rigid capacitor electrode 3 is longitudinally segmented and installed to the shell 2, the shell 2 is installed on the curved outer wall of the glass liner 1, so that the segmented capacitor electrode 3 does not need to be bent to form a liquid level detection device on the curved outer wall.

[0044] In principle, any complex curved surface can be approximated by a series of small plane areas. This is because in a smaller area, the curved surface can be considered to be sufficiently flat, which means that a rigid single capacitor electrode 3 can be approximately bent along the curved surface without being subjected to too much stress, so that a rigid capacitor electrode 3 can be used.

[0045] In the prior art, the PCB board with a continuous flat strip structure cannot adapt to the contour of the curved outer wall, resulting in installation difficulties. The area of ​​the PCB board with a continuous flat strip structure close to the glass liner 1 is small, which leads to a reduced detection range.

[0046] In this embodiment, the capacitor electrode piece 3 is arranged in sections, so that the rigid capacitor electrode piece 3 can be installed on the curved surface.

[0047] In this embodiment, a flexible connection such as a flexible circuit board or a flexible wire telecommunication can be used between the capacitor electrode 3 and the control board 4 to achieve electrical connection. By placing these flexible connections at the connection of the capacitor electrode 3, it is beneficial for the entire liquid level detection device to adapt to the curved outer wall while maintaining the continuity of the circuit.

[0048] At the same time, in this embodiment, the capacitor electrode pieces 3 are arranged in sections, so that the detection area formed by the multiple capacitor electrode pieces 3 is larger.

[0049] The problem in the prior art that the height of the flat long strip structure PCB board does not match the shape of the curved outer wall and the detection area of ​​a single continuous flat long strip structure PCB board is small is avoided.

[0050] In the prior art, the production cost of the soft PFB board is high, the consistency is relatively poor, and the soft PFB board is difficult to match with the glass liner 1. At the same time, the soft PFB board may age in a high temperature environment, and it is easy to change its position, resulting in a decrease in detection accuracy.

[0051] The capacitor electrode 3 is installed and fixed through the installation groove 201. Compared with the installation method in the prior art, it is not easy to fall off and age, and the position of the capacitor electrode 3 will not change with long-term use.

[0052] In this embodiment, the capacitor electrode 3 is installed in the installation groove 201. Compared with the prior art, the groove structure can better fix the capacitor electrode 3. There is no need to worry about the installation failure of the capacitor electrode 3 due to aging in a high temperature environment, which ensures the reliability of the installation of the capacitor electrode 3 and improves the accuracy of liquid level detection.

[0053] Furthermore, the mounting groove 201 is provided on the shell 2, and the capacitor electrode 3 does not need to be directly installed on the arc-shaped outer wall. The capacitor electrode 3 is less affected by temperature changes, and there is no need to worry about the capacitor electrode 3 being displaced or falling off during long-term hot and cold changes, thereby ensuring the reliability of the installation of the capacitor electrode 3 and improving the accuracy of liquid level detection.

[0054] In this embodiment, the rigid capacitor electrode piece 3 is not easily twisted or deformed during the installation process, and the rigid capacitor electrode piece 3 and the installation groove 201 can achieve higher precision installation and positioning.

[0055] In the prior art, the capacitor electrode 3 is positioned and installed based on the curved outer wall, and the positioning and installation accuracy of the curved glass surface is low. In this embodiment, the mounting groove 201 is processed on the shell 2, and the positioning reference of the mounting groove 201 is the shell 2. The positioning and installation of the mounting groove 201 and the capacitor electrode 3 are more accurate, ensuring the liquid level detection accuracy of the capacitor electrode 3. The shell 2 can be a strip-shaped bracket-like structure, the shell 2 can also be a part of the outer shell of the glass liner 1, the shell 2 can also be a part of the handle, the shell 2 can also be the part connecting the handle and the glass liner 1, and the shell 2 can also be other similar structures.

[0056] In addition, each capacitor electrode 3 can be independently manufactured and tested, and then installed in the installation slot 201. During the production and installation process, production efficiency can be improved, troubleshooting can be simplified, and a more flexible installation method can be allowed.

[0057] In the prior art, when the flexible capacitor electrode 3 fits the curved surface, the capacitor electrode 3 is also bent accordingly, so that the change in the water level or bubble height and the measured value of the capacitor electrode 3 differs greatly, and the rate of change of the measured value at the curved outer wall may increase or decrease, affecting the measurement accuracy.

[0058] Compared with the prior art, in this embodiment, when multiple segmented capacitor electrodes 3 are installed longitudinally along the arc-shaped outer wall, there is no need to additionally bend the capacitor electrodes 3, and the changes between the water level or bubble height and the measured value of the capacitor electrodes 3 are relatively consistent, and the measurement accuracy is high.

[0059] The capacitor electrodes 3 are installed at intervals in the longitudinal direction on the arc-shaped outer wall. Specifically, the capacitor electrodes 3 can be installed according to the calibrated capacity height line of the glass liner 1, so that the detection accuracy of the capacitor electrodes 3 is not affected by the curved surface.

[0060] In some embodiments, the arc-shaped outer wall may protrude toward the outside of the glass liner 1. The contact surface between the housing 2 and the arc-shaped outer wall may be consistent with the curve of the arc-shaped outer wall.

[0061] In some embodiments, the contact surface between the housing 2 and the arc-shaped outer wall is located at the edge of the housing 2. The mounting groove 201 is provided inside the contact surface. The mounting groove 201 can be formed during the injection molding process of the housing 2, or can be processed after the housing 2 is formed.

[0062] In the prior art, the capacitor electrode 3 detects the water level and anti-overflow signal by using the principle of touch sensing. When the capacitor electrode 3 is close to the liquid, it will sense the capacitance value, and the control chip will indirectly judge the water level signal and the anti-overflow signal according to the fluctuation of the capacitance value. The inventor has found through continuous research that the capacitance value of the capacitor electrode 3 sensing the liquid signal has a large variation range. When the capacitor electrode 3 is close to the liquid, the capacitance value fluctuates greatly, and when it is far away, the capacitance value fluctuates less.

[0063] Furthermore, in some embodiments, the capacitor electrode 3 may include a PCB back plate and a metal sheet disposed on one side of the PCB back plate. During actual installation, one side of the metal sheet may face the glass liner 1, thereby reducing the distance between the metal sheet and the glass liner 1 and ensuring the detection accuracy of the capacitor electrode 3.

[0064] In addition, in actual use, the capacitance value change produced by the capacitor electrode 3 will also be affected by environmental factors, and parasitic capacitance is easily formed, and the parasitic capacitance will also cause the capacitor electrode 3 to sense smaller capacitance value fluctuations, and the control board 4 may also have the possibility of misjudgment. For example, when a person's hand is close to the shell 2 and the capacitor electrode 3, the capacitance value will also fluctuate. At this time, the control board 4 cannot distinguish whether it is an interference capacitance value or an actual liquid level capacitance value, or water droplets on the outer wall of the pulping container will also cause the capacitor electrode 3 to sense the fluctuation of the capacitance value, and the control chip may have a misjudgment situation.

[0065] In some embodiments, a mesh shielding layer is provided on the side of the capacitor electrode 3 away from the glass liner 1, and the mesh shielding layer is a copper-clad mesh, and the mesh shielding layer is grounded to shield the inductive interference of the external parasitic capacitance on the capacitor electrode 3. The connection circuit between the metal sheet and the control board 4 can be set on the rear surface of the PCB backplane, and the connection circuit is routed along the peripheral edge of the mesh shielding layer.

[0066] In some implementations, in order to improve the detection accuracy and insulation of the capacitor electrode 3, the surface of the capacitor electrode 3 may be filled with glue.

[0067] In some embodiments, the capacitor electrode 3 is arranged along the height direction of the arc-shaped outer wall, which is convenient for detecting the height of the liquid level and reduces the influence of the bending of the glass liner 1 in the circumferential direction on the detection accuracy.

[0068] For the liquid heater, multiple capacitor electrodes 3 are arranged at intervals in the height direction to form a liquid level detection device. The liquid level detection device can realize water level detection of multiple different pulping capacities, and can also realize detection of different anti-overflow signals corresponding to multiple different pulping capacities. Compared with the existing anti-overflow detection position with only one fixed position, the capacitor electrodes 3 are arranged at intervals in the height direction, which can realize more intelligent and refined liquid level detection; it can also solve the problem that there is only one fixed anti-overflow detection position in the prior art that is prone to failure.

[0069] Furthermore, for different capacities of the inner tank at different heights, the capacitor electrodes 3 are also spaced apart and arranged at different heights, which not only improves the accuracy of liquid level detection, but also enables the rigid capacitor electrodes 3 to be installed on the arc-shaped outer wall.

[0070] In some embodiments, the minimum water level capacity of the glass inner container 1 is generally not lower than the lower edge of the detection area of ​​the capacitor electrode 3 with the lowest height, so as to ensure that at least one capacitor electrode 3 detects the water level when the liquid heater is working.

[0071] In some embodiments, the maximum water level capacity of the glass liner 1 is generally not higher than the upper edge of the detection area of ​​the highest capacitor electrode 3, so as to ensure that the capacitor electrode 3 detects the water level when the liquid heater is working to prevent the water level from being too high or too low.

[0072] In some embodiments of the present invention, the shell 2 can be fixed to the shell 2 by gluing, snapping with other structural parts, or by an inner liner clamp.

[0073] In some embodiments, the capacitor electrode 3 can be fixed to the mounting groove 201 by gluing. The thickness of the mounting groove 201 can be set to be smaller than the thickness of the capacitor electrode 3, so that after the capacitor electrode 3 protrudes from the housing 2 and is installed with the glass liner 1, the detection area of ​​the capacitor electrode 3 can be closer to the glass liner 1, or even fit the glass liner 1, thereby improving the detection accuracy of the capacitor electrode 3.

[0074] However, in actual use, due to the influence of processing errors, the protrusion degree of each capacitor electrode 3 is different, and the fit between the capacitor electrode 3 and the glass liner 1 is also different, which may cause additional errors in liquid level detection.

[0075] In order to solve the above problem, in some implementations of the present embodiment, an elastic member 202 is provided in the single installation groove 201 , and after the shell 2 is installed on the arc-shaped outer wall of the glass liner 1 , the elastic member 202 presses the capacitor electrode 3 against the outer wall surface of the glass liner 1 .

[0076] In the above embodiment, the elastic member 202 enables the capacitor electrode pieces 3 to be in close contact with the outer wall surface of the glass liner 1, thereby preventing a gap from appearing between the capacitor electrode pieces 3 and the glass liner 1, thereby ensuring detection accuracy.

[0077] Especially during the heating process of the liquid heater, the bursting of bubbles will cause vibration of the glass liner 1 and other structures. The elastic member 202 can effectively reduce the influence of vibration on the capacitor electrode 3, so that the capacitor electrode 3 always abuts against the outer wall or the curved outer wall of the glass liner 1.

[0078] In addition, when the capacitor electrode 3 is subjected to external force, the elastic member 202 can be compressed and deformed to prevent the external force from bending or damaging the capacitor electrode 3, and the capacitor electrode 3 can be better installed and matched with the arc-shaped outer wall.

[0079] At the same time, the elastic member 202 is filled between the capacitor electrode 3 and the mounting groove 201 , which increases the distance between the capacitor electrode 3 and the outer surface of the housing 2 , and can further reduce the impact of environmental factors on the capacitor electrode 3 .

[0080] In some embodiments, the elastic member 202 may be an insulating member.

[0081] In some implementations of this embodiment, the elastic member 202 is a silicone member or a spring.

[0082] In the above embodiment, the silicone member can withstand a wide range of temperatures, up to a high temperature of more than 200° C., and is suitable for the working scene of the liquid heater. At the same time, the silicone member has good electrical insulation performance and is suitable for elastically supporting the capacitor electrode 3.

[0083] The elasticity of the spring can be adjusted through its design (such as wire diameter, number of coils, material, etc.) to adapt to the working environment and use requirements of different liquid heaters.

[0084] In actual use, the temperature of the side close to the glass liner 1 is higher. During the heating process of the liquid heater, the connection between the capacitor electrode 3 and the elastic member 202 will be slightly affected by thermal expansion and contraction.

[0085] In order to solve the above problem, in some implementations of this embodiment, the elastic member 202 is connected to the capacitor electrode 3 by adhesive.

[0086] In the above embodiment, the adhesive can fill the tiny gaps, provide a good sealing effect, and prevent moisture, dust and other pollutants from entering. At the same time, the capacitor electrode 3 can be simultaneously filled with glue during the processing, which simplifies the processing flow.

[0087] The adhesive has good deformation ability. The adhesive between the elastic member 202 and the capacitor electrode 3 can adapt to the thermal expansion and contraction caused by temperature changes in special circumstances, thereby ensuring the detection accuracy of the capacitor electrode 3.

[0088] In some implementations of this embodiment, the elastic member 202 is connected to the bottom surface of the installation groove 201 by adhesive.

[0089] In the above embodiments, the assembly process can be simplified by adhesive connection without the need for additional fixings such as screws or clamps, which can reduce assembly time, especially in mass production and installation.

[0090] The adhesive can evenly distribute stress throughout the mounting slot 201, which helps to improve the overall strength and durability of the structure.

[0091] In some implementations of the present embodiment, the above-mentioned multiple capacitor electrodes 3 are installed on the side of the corresponding substrate facing the glass inner liner 1, the above-mentioned substrate is installed in the installation groove 201, and a detection chip is provided on the side of each substrate facing away from the glass inner liner 1, and the multiple capacitor electrodes 3 are electrically connected to the above-mentioned control board 4 through the corresponding detection chip.

[0092] In some implementations of this embodiment, multiple mounting slots 201 and the same number of substrates are included, and the substrates are installed in the mounting slots 201 one by one, that is, each independent mounting slot 201 has and only has one substrate. The number of capacitor electrodes 3, detection chips and substrates is also the same, and each substrate is installed with a capacitor electrode 3 and a detection chip, the capacitor electrode 3 is located on the side facing the glass liner 1, and the detection chip is located on the side opposite to the glass liner 1. When the capacitor electrode 3 is working, the detection signal of the capacitor electrode 3 is electrically connected to the control board 4 through the corresponding detection chip.

[0093] During actual installation, one side of the substrate where the detection chip is located can be installed on the inner wall of the installation groove 201 or connected to the elastic member 202. The capacitor electrode 3, the substrate and the detection chip can be glued together for waterproofing.

[0094] In actual use, when the liquid heater is in the process of making slurry, when the slurry is whipped or heated, bubbles, foam and other substances will rise on the surface of the slurry. However, the existing single self-height capacitor electrode 3 has a small fluctuation in the capacitance value of the bubbles and foams sensed by the capacitor electrode 3, and the control board 4 cannot accurately identify whether it is a parasitic capacitor or an actual anti-overflow signal.

[0095] In some implementations of the present embodiment, the multiple capacitor electrodes 3 include multiple first capacitor electrodes 301 and multiple second capacitor electrodes 302, the height of a single second capacitor electrode 302 is greater than the height of a single first capacitor electrode 301, the multiple second capacitor electrodes 302 together form an anti-overflow detection area, and the multiple first capacitor electrodes 301 together form a water level detection area, and the above-mentioned anti-overflow detection area is arranged on the upper side of the above-mentioned water level detection area.

[0096] In the above embodiments, in order to achieve different functions, any capacitor electrode 3 can be either the first capacitor electrode 301 or the second capacitor electrode 302 .

[0097] In some embodiments, the first capacitor electrode 301 can be used to detect the pulping water level under the corresponding pulping capacity, and the second capacitor electrode 302 is used to detect the anti-overflow height reached by the slurry under the corresponding pulping capacity during the pulping process. When the second capacitor electrode 302 detects that the slurry of the current pulping capacity has reached the preset anti-overflow detection position, the control board 4 performs corresponding operations according to the program settings, such as stopping the motor or stopping the heating to wait for anti-overflow.

[0098] As attached Figure 3 , the detection height of a single second capacitor electrode 302 is H, the detection height of a single first capacitor electrode 301 is h, and H is greater than h.

[0099] Since the detection height of the single second capacitor electrode 302 is greater than the detection height of the single first capacitor electrode 301, the second capacitor electrode 302 has a larger sensing area during actual detection, can obtain a larger fluctuating capacitance value, and achieve more accurate anti-overflow signal detection. Compared with the existing technology, it can detect rising bubbles, foams and other anti-overflow signals, effectively solving the problem that the existing single type of capacitor electrode 3 can only detect the water level more accurately but cannot effectively detect the anti-overflow signal, and greatly reduces the safety risk of overflow of bubbles, foams and other slurries that are prone to occur during the application of the existing capacitive anti-overflow detection technology.

[0100] In some implementations of the present embodiment, the second capacitor electrode 302 is provided with a dividing groove, which divides the overflow detection area into a first sub-overflow detection area 321 and a second sub-overflow detection area 322 arranged side by side, and the first sub-overflow detection area 321 and the second sub-overflow detection area 322 are electrically connected to the control board 4 respectively, wherein at the same liquid level height below the highest point of the overflow detection area, the sensing area of ​​the first sub-overflow detection area 321 is not equal to the sensing area of ​​the second sub-overflow detection area 322.

[0101] In the above embodiment, a plurality of capacitor electrodes 3 are arranged in segments, and the capacitance values ​​detected by the first sub-overflow detection area 321 and the second sub-overflow detection area 322 of each capacitor electrode 3 are used. The capacitance value increment ratio of the two triangles can be basically equivalent to the area ratio of the two triangles covered by slurry foam. According to this principle, the detected anti-overflow liquid level can be closer to the set anti-overflow liquid level, thereby greatly reducing the probability of slurry overflow and improving the safety risk of anti-overflow.

[0102] Specifically, the second capacitor electrode 302 is divided into a first sub-overflow detection area 321 and a second sub-overflow detection area 322 respectively located in two columns, and each sub-electrode of the sub-overflow detection area in the two columns is electrically connected to the control board 4 one by one through the circuit.

[0103] In some embodiments, the dividing groove may be a straight dividing groove inclined relative to the capacitor electrode 3;

[0104] In some embodiments, the dividing groove may be a curved dividing groove;

[0105] In some implementations of the present embodiment, a plurality of limit blocks 211 are disposed on one side of the housing 2 facing the arc-shaped outer wall, and two adjacent mounting grooves 201 are isolated by the limit blocks 211 .

[0106] In the above embodiment, during the processing or injection molding of the housing 2, the material is injected into the mold cavity to form the stopper 211 and the mounting groove 201. After the injection molding is completed, the stopper 211 can be formed by cooling and solidification.

[0107] The limiting block 211 can also be fixed to the housing 2 by means of buckles, screws or other mechanical connection methods.

[0108] The limit block 211 can be arranged on the left and right sides of the installation slot 201. The limit block 211 can also be arranged in the middle of the installation slot 201, and the limit block 211 and the inner edges of the left and right sides of the installation slot 201 can form a wire groove, which can accommodate the connection wire between the capacitor electrode 3 and the control board 4.

[0109] In some implementations of this embodiment, the control board 4 is installed below the glass liner 1, the shell 2 is provided with a wiring groove, and the wiring groove is located outside the installation groove 201, and the capacitor electrode 3 is provided with a wire electrically connected to the control board 4, and the wire is arranged in the wiring groove.

[0110] In the above embodiment, if a shell control panel 4 is provided at the lower side of the glass liner 1, it can be installed in the shell at the lower side of the glass liner 1; the control panel 4 can also be provided in the housing 2 or the handle.

[0111] In actual use, the wiring trough can be arranged on the left side and / or right side of the installation slot 201 according to actual conditions.

[0112] For example, the plurality of first capacitor electrodes 301 and the plurality of second capacitor electrodes 302 may be connected to the control board 4 via wiring grooves disposed on the left side (or the right side).

[0113] For example, when the second capacitor electrode 302 is divided into a first sub-overflow detection area 321 and a second sub-overflow detection area 322 which are respectively located in two columns, the wires of the first sub-overflow detection area 321 can be connected to the control board 4 through the left (or right) wiring groove, and the wires of the second sub-overflow detection area 322 can be connected to the control board 4 through the right (or left) wiring groove.

[0114] Each of the above-mentioned installation slots 201 can be independently provided with a wiring slot connected to the control board 4 to prevent the wires from being entangled or interfering with each other. The installation slots 201 can also share the wiring slots on the same side.

[0115] The wire inlet of the wiring trough can be connected to the installation groove 201 horizontally or tilted to avoid the possibility of the wire line being squeezed by the capacitor electrode 3.

[0116] In some implementations of this embodiment, the housing 2 includes a mounting plate, and the mounting slot 201 is disposed on the mounting plate;

[0117] Alternatively, the housing 2 includes a handle, and the mounting groove 201 is disposed on the handle.

[0118] In the above embodiment, the capacitor electrode 3 is installed in the housing 2 with a handle, which improves the integration of the liquid heater and eliminates the need to separately provide a housing 2 for installing the capacitor electrode 3.

[0119] The handle and the arc-shaped outer wall can be connected and fixed by one or more methods such as a clamp or glue. A seal such as a rubber ring can be provided between the mounting plate and the arc-shaped outer wall to prevent liquid or water vapor from entering the mounting plate, thereby ensuring the detection accuracy of the capacitor electrode 3.

[0120] In addition, it should be noted that the liquid heater of the utility model is not limited to the food processor with integrated motor and cup body disclosed in the embodiment of the utility model, but can also be a soymilk machine with motor mounted on top, a wall-breaking machine with cup body and base separated, and a food processor that can realize automatic pulp discharge and automatic cleaning without hand washing. Moreover, the liquid heater of the utility model can also be applied to heating appliances that can perform pulp boiling operations, rice paste making, etc., such as health pots, health pots, etc.

[0121] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid heater, comprising a glass liner, wherein the glass liner comprises an arc-shaped outer wall extending in a height direction, and a shell fixedly attached to the arc-shaped outer wall; It is characterized in that A plurality of mounting grooves are arranged at intervals along the height direction of the arc-shaped outer wall on one side of the shell facing the glass liner; It also includes a control board and a plurality of rigid capacitor electrodes, wherein the plurality of capacitor electrodes are installed in a plurality of installation grooves one by one to form a liquid level detection device, and the capacitor electrodes are electrically connected to the control board respectively.

2. A liquid heater according to claim 1, characterized in that: An elastic member is arranged in a single installation groove. After the shell is installed on the arc-shaped outer wall of the glass liner, the elastic member presses the capacitor electrode tightly against the outer wall surface of the glass liner.

3. A liquid heater according to claim 2, characterized in that: The elastic member is a silicone member or a spring.

4. A liquid heater according to claim 2, characterized in that: The elastic member is connected to the capacitor electrode by adhesive.

5. The liquid heater according to claim 1, characterized in that: The multiple capacitor electrodes are installed on the side of the corresponding substrate facing the glass liner. The substrate is installed in the installation groove. A detection chip is provided on the side of each substrate facing away from the glass liner. The multiple capacitor electrodes are electrically connected to the control board through the corresponding detection chips.

6. A liquid heater according to claim 1, characterized in that: The multiple capacitor electrodes include multiple first capacitor electrodes and multiple second capacitor electrodes. The detection height of a single second capacitor electrode is greater than the detection height of a single first capacitor electrode. The multiple second capacitor electrodes together form an anti-overflow detection area. The multiple first capacitor electrodes together form a water level detection area. The anti-overflow detection area is arranged on the upper side of the water level detection area.

7. A liquid heater according to claim 6, characterized in that: The second capacitor electrode is provided with a dividing groove, which divides the anti-overflow detection area into a first sub-anti-overflow detection area and a second sub-anti-overflow detection area arranged side by side, the first sub-anti-overflow detection area and the second sub-anti-overflow detection area are electrically connected to the control board respectively, wherein at the same liquid level height below the highest point of the anti-overflow detection area, the sensing area of ​​the first sub-anti-overflow detection area is not equal to the sensing area of ​​the second sub-anti-overflow detection area.

8. The liquid heater according to claim 1, characterized in that: A plurality of limit blocks are arranged on one side of the shell body facing the arc-shaped outer wall, and two adjacent mounting grooves are isolated by the limit blocks.

9. The liquid heater according to claim 1, characterized in that: The control board is installed below the glass liner, the shell is provided with a wiring groove, and the wiring groove is located outside the installation groove, the capacitor electrode is provided with a wire electrically connected to the control board, and the wire is arranged in the wiring groove.

10. The liquid heater according to claim 1, characterized in that: The housing comprises a mounting plate, and the mounting slot is arranged on the mounting plate; Alternatively, the housing includes a handle, and the mounting groove is arranged on the handle.

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