Liquid heater capable of detecting liquid level in non-contact mode

Abstract

The utility model discloses a liquid heater capable of detecting liquid level in a non-contact manner, which belongs to the field of living electric appliances, solves the problem of liquid level detection deviation caused by unreliable fixation of a detection plate, and adopts the technical scheme that the detection plate for detecting the liquid level in the non-contact manner is hidden between a shell and a glass cup body; the detection plate longitudinally extends along the outer wall of the glass cup body, the detection plate is provided with a first side face facing the glass cup body and a second side face back to the glass cup body, and the gap between the first side face and the glass cup body is fully coated with jelly to fill the gap between the first side face and the glass cup body; and the detection plate is fixed on the outer side wall of the glass cup body and is elastically supported by utilizing the solidified jelly. According to the utility model, the gap between the detection plate and the glass cup body is filled with jelly, so that the fixing reliability of the detection plate is improved, good detection sensitivity is ensured, and the detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to a household electrical appliance, in particular to a liquid heater for contactless liquid level detection. Background Art

[0002] In the process of cooking or boiling food in a liquid heating container, the food will produce some non-liquid water or other liquid substances during the cooking process. For example, in the process of making soy milk or boiling rice porridge, some soybeans or white rice are first added to the liquid, and the liquid bean mixture or the liquid rice mixture is heated by a heating device such as a heating tube in the liquid heating container. During the cooking process, the liquid bean mixture or the liquid rice mixture will produce some bubbles, foam, pulp and other pulp substances.

[0003] In the prior art, in order to prevent the slurry substance from rising to a high height and overflowing from the liquid heating container, a detection plate for remote detection is generally provided on the liquid heating container. For example, the prior art CN106108646A discloses a food cooking machine, which includes a cup body, a knife group, a cup fixing seat and a control circuit board; the knife group is arranged at the bottom of the cup body, the cup body is fixed to the cup fixing seat, an electric heating element is arranged in the cup fixing seat, a signal PCB board is arranged on the circumferential side wall of the cup body, and a metal sheet is arranged on the signal PCB board; the knife group, the electric heating element and the signal PCB board are all connected to the control circuit board. The signal PCB is arranged between the cup handle and the cup body. The metal sheet on the signal PCB forms a capacitor with the food in the cup body. The volume of the food in the cup body increases, and the change in the volume of the food in the cup body causes the capacitance of the capacitor to change. The capacitor charges and discharges and generates a charge transfer signal on the signal PCB. The signal PCB transmits the charge transfer signal to the control circuit board. The control circuit board receives the charge transfer signal and determines the size of the food volume in the cup body through the charge transfer signal. If the size of the food volume in the cup body exceeds the preset value, the control circuit board sends a signal to control the working power of the electric heating element or the knife group, and controls the volume of the food in the cup body, thereby effectively preventing overflow. The metal sheet and the signal PCB do not directly contact the food, and do not need to be cleaned, making it more convenient to use.

[0004] The outer side of the cup body is an arc surface, and the signal PCB board generally adopts a flat structure. The signal PCB board cannot be completely fitted with the cup body. The middle area of ​​the signal PCB board in the width direction can only be fitted tightly against the outer wall of the cup body. A large gap will be formed between the edges of the signal PCB board and the outer wall of the cup body. If the signal PCB board is not fixed reliably, the gaps on both sides of the middle area of ​​the signal PCB board will be unevenly distributed, which will cause deviations in liquid level detection. For example, the detection sensitivity will be reduced due to the excessive gap from the metal sheet to the cup body, and the detection accuracy will be affected due to the different sizes of gaps at different heights. Utility Model Content

[0005] The purpose to be achieved by the utility model is to provide a liquid heater for contactless liquid level detection, to solve the problem of deviation in liquid level detection caused by unreliable fixation of the detection plate, to use a colloid to fill the gap between the detection plate and the glass cup body, to improve the reliability of the fixation of the detection plate, to ensure good detection sensitivity, and also to help improve detection accuracy.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a liquid heater for contactless liquid level detection, comprising a glass cup body and a heating plate, the heating plate and the glass cup body cooperate to form a container for holding liquid, a shell is provided on the outside of the glass cup body, a detection plate for contactless liquid level detection is hidden between the shell and the glass cup body, the detection plate extends longitudinally along the outer wall of the glass cup body, the detection plate has a first side surface facing the glass cup body and a second side surface facing away from the glass cup body, the first side surface and the glass cup body are coated with a colloid to fill the gap between the first side surface and the glass cup body, the detection plate is fixed to the outer wall of the glass cup body and uses the solidified colloid to obtain elastic support.

[0007] After adopting the above technical solution, the utility model has the following advantages: before the jelly solidifies, the position of the detection plate can be fine-tuned by using the viscosity of the jelly, so that the gap between the first side and the outer wall of the glass cup body is more evenly distributed. The gap between the first side and the glass cup body is covered with jelly, which can greatly improve the reliability of the fixation of the detection plate. At the same time, the gap between the detection plate and the glass cup body is filled with jelly to reduce the influence of air on liquid level detection, ensure good detection sensitivity, and also help improve detection accuracy. And after the jelly solidifies, the jelly will have a certain elasticity, which can provide elastic support for the detection plate, reduce the influence of external vibration on the detection plate, and help to ensure the detection sensitivity and detection accuracy of the detection plate for long-term use.

[0008] Furthermore, the outer side wall of the glass body has a fixed area, and the first side surface is coated with glue and fixedly connected to the fixed area.

[0009] By adopting the above technical solution and designing the fixed area, it is convenient to clearly identify the installation position of the detection board and improve the assembly efficiency. The operation on the first side is convenient to evenly apply the glue and avoid the generation of bubbles.

[0010] Furthermore, the outer side wall of the glass body has a fixed area, and after the fixed area is coated with the glue, the first side surface is tightly attached to the fixed area.

[0011] By adopting the above technical solution and designing the fixed area, it is convenient to clarify the installation position of the detection board and improve the assembly efficiency. By operating on the fixed area, it is convenient to apply an appropriate amount of glue at positions of different sizes of gaps according to the shape of the fixed area.

[0012] Furthermore, the fixing area is an arc surface extending along the circumference of the glass cup body, the first side surface is a plane, the gap between the first side surface and the fixing area increases from the middle area to the two longitudinal edges, and the colloid fills the gap to support the detection plate.

[0013] The above technical solution improves the fit between the first side of the detection plate and the outer wall of the glass cup body, which is conducive to improving the detection sensitivity and accuracy. The colloid can adapt well to gaps of different sizes, and the gap between the first side and the fixed area is basically filled with no air.

[0014] Furthermore, the colloid is a sticky glue, and the detection plate is fixedly connected to the glass cup body via the sticky glue.

[0015] By adopting the above technical solution, the detection plate is directly fixed to the outer wall of the glass cup body by adhesive. The fixing method is simple and efficient. The condition of the detection plate can be directly observed during the assembly process, which is conducive to improving the assembly efficiency and assembly quality.

[0016] Furthermore, the colloid is a non-sticky glue, and a mounting bracket is provided on the outer side of the glass cup body, and the mounting bracket is fixedly connected to the glass cup body to press and fix the detection plate; or, the colloid is a non-sticky glue, and the shell is fixedly connected to the glass cup body to press and fix the detection plate.

[0017] By adopting the above technical solution, there are multiple options for fixing the detection board.

[0018] Furthermore, a first mold frame is provided on the outer peripheral side of the detection plate to prevent the colloid from overflowing. The first mold frame has a mating surface close to the outer wall of the glass cup body and an outer frame surface facing away from the glass cup body. The first mold frame and the fixed area form a accommodating cavity for accommodating the detection plate, and the second side surface is sunken relative to the outer frame surface.

[0019] The above-mentioned technical solution is adopted to prevent the colloid from spilling everywhere. The colloid overflowing from between the first side and the outer wall of the glass cup body is blocked by the first mold frame and flows to the second side. This part of the colloid can be used to encapsulate the second side to a certain extent, thereby reducing the waste of colloid and reducing production costs.

[0020] Furthermore, after the detection plate is fixed, the first mold frame is retained or removed.

[0021] By adopting the above technical solution, the first mold frame is retained, which is beneficial for the colloid to maintain structural stability for a long time; the first mold frame is removed and can be reused, saving costs.

[0022] Furthermore, the second side surface is provided with electronic components, and the second side surface is coated with waterproof glue for encapsulating the electronic components.

[0023] By adopting the above technical solution, the service life of electronic components can be increased.

[0024] Furthermore, a second mold frame surrounding the electronic component is provided on the second side surface, and the second mold frame is closely attached to the second side surface to prevent the waterproof glue from dispersing, and the second mold frame is retained or removed after the waterproof glue solidifies.

[0025] With the above technical solution, the second mold frame only needs to surround the electronic components, which can reduce the amount of waterproof glue used and reduce costs; retaining the second mold frame after the waterproof glue solidifies is conducive to the waterproof glue maintaining long-term structural stability. In order to improve the utilization rate of the second mold frame, the second mold frame can be removed after the waterproof glue solidifies, and the second mold frame can be reused, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of a liquid heater for contactless liquid level detection according to the utility model;

[0028] Figure 2 It is a cross-sectional view of the glass cup body at a height position in the utility model;

[0029] Figure 3 for Figure 2 The enlarged view of point I in the middle;

[0030] Figure 4 It is a bottom view of the container in the utility model;

[0031] Figure 5 This is a schematic diagram of adding a first mold frame in the utility model;

[0032] Figure 6 It is a schematic diagram of the first mold frame in the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0034] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0035] The following specific embodiments are used to describe the technical solution of the utility model 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.

[0036] The utility model provides a liquid heater for non-contact liquid level detection, such as Figures 1 to 4 As shown, it includes a glass cup body 100 and a heating plate 200. The heating plate 200 cooperates with the glass cup body 100 to form a container for holding liquid. A shell 300 is provided on the outside of the glass cup body 100. A detection plate 400 for contactless detection of liquid level is hidden between the shell 300 and the glass cup body 100. The detection plate 400 extends longitudinally along the outer wall of the glass cup body 100. The detection plate 400 has a first side surface 401 facing the glass cup body 100 and a second side surface 402 facing away from the glass cup body 100. The first side surface 401 and the glass cup body 100 are coated with a gel 900 to fill the gap between the first side surface and the glass cup body. The detection plate is fixed to the outer wall of the glass cup body and obtains elastic support by using the solidified gel.

[0037] In the utility model, before the jelly solidifies, the position of the detection plate can be fine-tuned by using the viscosity of the jelly, so that the gap between the first side and the outer wall of the glass cup body is more evenly distributed. The gap between the first side and the glass cup body is covered with jelly, which can greatly improve the reliability of the fixation of the detection plate. At the same time, the gap between the detection plate and the glass cup body is filled with jelly to reduce the influence of air on the liquid level detection, ensure good detection sensitivity, and also help to improve the detection accuracy. And after the jelly solidifies, the jelly will have a certain elasticity, which can provide elastic support for the detection plate, reduce the influence of external vibration on the detection plate, and help to ensure the detection sensitivity and detection accuracy of the detection plate for long-term use.

[0038] The glass cup body 100 can generally be a simple glass product, and the detection board 400 is in contact with the glass material through the colloid 900. The glass cup body 100 can also include a glass substrate and a film. The film is arranged on the outer side of the glass substrate and can cover part or all of the outer side of the glass substrate. Some marks, such as water level marks, prompt marks, etc., are set on the film. At this time, the outer wall of the glass cup body 100 is the outer side of the film, and the detection board 400 is in contact with the film through the colloid 900. In addition, a silk-screen shielding layer, such as ink or film, can be set on the outer wall of the glass cup body 100 to prevent the user from directly observing the detection board through the glass cup body 100 from the inside of the glass cup body 100, thereby improving the aesthetics. The silk-screen shielding layer is considered to be a part of the glass cup body 100, and the outer wall of the glass cup body 100 is the outer side of the silk-screen shielding layer. The detection board 400 is in contact with the silk-screen shielding layer through the colloid 900.

[0039] The shell 300 may only cover a portion of the outer wall of the glass body 100, for example Figure 1 The middle shell 300 is designed to have a handle 31, which can cover the detection board 400, so that the user can observe the working conditions inside the container through the glass cup body 100, thereby improving the user experience. A heating tube 21 is arranged around the center of the heating plate 200 on one side of the heating plate 200, and the heating tube 21 can heat the food in the container when it is working. The shell 300 can also completely cover the outer wall of the glass cup body 100 to protect the glass cup body 100, and an observation window can be opened on the shell 300 to observe the working conditions inside the container. It is a prior art that the detection board 400 realizes the function of liquid level detection, which is generally realized by the sensing electrode sheet 41. For details, please refer to the signal PCB board mentioned in the background technology, which will not be repeated here.

[0040] In order to facilitate the installation position of the detection plate 400, the outer wall of the glass cup body 100 can be designed to have a fixed area 101. In one embodiment, the first side surface 401 can be first coated with the glue 900 and then fixedly connected to the fixed area 101. The operation on the first side surface is convenient for evenly applying the glue and avoiding the generation of bubbles. It is understandable that in another embodiment, it is also feasible to first coat the fixed area 101 with the glue 900 and then attach the first side surface 401 to the fixed area 101. The operation on the fixed area is convenient for applying an appropriate amount of glue at positions with different gap sizes according to the shape of the fixed area.

[0041] The common glass cup body 100 is generally a rotating body structure, for example, the basic shape is a cylindrical structure with substantially equal diameters from top to bottom, or a conical structure with a small top diameter and a large bottom diameter, or a drum-shaped structure with a small top diameter and a large bottom diameter and a middle portion protruding outward relative to the bottom, etc. Therefore, the outer wall of the glass cup body 100 is generally a curved surface structure, and the corresponding fixed area 101 may also be a variety of curved surface structures, such as Figure 3 As shown, the fixed area 101 is an arc surface extending along the circumference of the glass body, the first side surface 401 is a plane, and the gap between the first side surface and the fixed area increases from the middle area to the two longitudinal edges. The colloid fills the gap to support the detection plate, which can improve the fit between the first side surface of the detection plate and the outer wall of the glass body, which is conducive to improving the detection sensitivity and accuracy. The colloid can adapt well to gaps of different sizes, and there is basically no air in the gap between the first side surface and the fixed area after it is filled.

[0042] In addition, in the height direction of the glass body 100, in order to increase the fitting area and fit between the first side surface 401 of the detection plate 400 and the outer wall of the glass body 100, the detection plate 400 may be configured as a curved surface structure that fits the fixing area 101. Figures 1 to 3 As shown, the fixed area 101 is an inclined arc surface extending upward and inward along the height direction of the glass cup body 100, and the detection board 400 extends along the inclined arc surface. Alternatively, in another embodiment, the fixed area 101 is a vertical arc surface extending vertically along the height direction of the glass cup body 100, and the detection board 400 extends along the vertical arc surface. Alternatively, in another embodiment, the fixed area 101 is a vertical plane extending vertically along the height direction of the glass cup body 100, and the detection board 400 extends along the vertical plane. In short, when the fixed area 101 is a relatively simple curved surface structure, the detection board 400 can be adjusted to adapt to the shape of the fixed area 101 to obtain a larger fitting area and a better fit.

[0043] In one embodiment, the colloid can be selected as a sticky glue, and the detection board is fixedly connected to the glass cup body by the sticky glue, such as common glass glue, etc. The detection board is directly fixed to the outer wall of the glass cup body by the sticky glue. The fixing method is simple and efficient. The condition of the detection board can be directly observed during the assembly process, which is conducive to improving the assembly efficiency and assembly quality. In another embodiment, the colloid can also be selected as a non-sticky glue. Then, in order to fix the detection board, a mounting bracket can be provided on the outer side of the glass cup body. The mounting bracket is fixedly connected to the glass cup body to press and fix the detection board. The detection board can also be pressed and fixed by using a shell and a fixed connection with the glass cup body. The non-sticky glue is not absolutely non-sticky, and it can also be so sticky that it is not enough to fix the detection board. It can be understood that the detection board can also be fixed in a common way.

[0044] In the process of applying the glue 900 to fix the detection plate 400, pressure is applied to the detection plate 400 to make the detection plate 400 fit the glass cup body 100 as closely as possible, so that the glue 900 squeezes out the air between the first side surface 401 and the outer wall of the glass cup body 100. In order to prevent the glue 900 from scattering everywhere, a first mold frame 500 can be provided on the outer peripheral side of the detection plate 400 to prevent the glue from overflowing. Figure 5 and Figure 6 The first mold frame 500 has a matching surface 501 that is in close contact with the outer wall of the glass cup body 100 and an outer frame surface 502 that is opposite to the glass cup body 100. The first mold frame 500 and the fixed area 101 enclose a receiving cavity for receiving the detection board 400, and the second side surface 402 is sunken relative to the outer frame surface 502. The matching surface 501 of the first mold frame 500 is in close contact with the outer wall of the glass cup body 100, which can effectively prevent the colloid 900 overflowing from between the first side surface 401 and the outer wall of the glass cup body 100 from continuing to spread outward, and will be blocked by the first mold frame 500 and flow to the second side surface 402. This part of the colloid 900 can be used to encapsulate the second side surface 402 to a certain extent, reducing the waste of the colloid 900 and reducing the production cost. In order to limit the detection plate 400 well, limiting ribs 51 can be set on the first mold frame 500. The limiting ribs 51 can be set on the inner side surface and four corners of the first mold frame 500. The limiting ribs 51 abut against the edge of the detection plate 400, so that a gap 503 for accommodating the glue can be formed between the inner side surface of the first mold frame 500 and the edge of the detection plate 400, thereby increasing the uniformity of the glue wrapping the detection plate 400.

[0045] If the cost of the first mold frame 500 is low, the first mold frame 500 can be retained after the detection plate 400 is fixed, which is conducive to the long-term structural stability of the colloid 900. In order to improve the utilization rate of the first mold frame 500, the first mold frame 500 can be removed after the detection plate 400 is fixed, and the first mold frame 500 can be reused to save costs.

[0046] In order to convert the liquid level into an electrical signal, the second side surface 402 is provided with an electronic component 42. In order to increase the service life of the electronic component 42, a waterproof glue for encapsulating the electronic component 42 can be applied to the second side surface 402. The waterproof glue is applied to the entire second side surface 402 to achieve the overall encapsulation of the detection board 400, and the blocking effect of the first mold frame 500 can effectively prevent the waterproof glue from spilling.

[0047] In order to reduce the amount of waterproof glue used, a second mold frame surrounding the electronic component 42 can also be provided on the second side 402. The second mold frame is close to the second side 402 to prevent the waterproof glue from dispersing. The second mold frame only needs to surround the electronic component 42, which can reduce the amount of waterproof glue used and reduce costs. In the case where the cost of the second mold frame is low, the second mold frame can be retained after the waterproof glue solidifies, which is conducive to the waterproof glue maintaining structural stability for a long time. In order to improve the utilization rate of the second mold frame, the second mold frame can be removed after the waterproof glue solidifies, and the second mold frame can be reused to save costs.

[0048] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. 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 for contactless liquid level detection, comprising a glass body and a heating plate, wherein the heating plate and the glass body cooperate to form a container for containing liquid, characterized in that: A shell is provided on the outside of the glass cup body, and a detection plate for contactless liquid level detection is hidden between the shell and the glass cup body. The detection plate extends longitudinally along the outer wall of the glass cup body, and has a first side surface facing the glass cup body and a second side surface facing away from the glass cup body. A gel is applied between the first side surface and the glass cup body to fill the gap between the first side surface and the glass cup body. The detection plate is fixed to the outer wall of the glass cup body and obtains elastic support by using the solidified gel.

2. The liquid heater for contactless liquid level detection according to claim 1, characterized in that: The outer side wall of the glass body has a fixed area, and the first side surface is closely attached to the fixed area after being coated with the colloid.

3. The liquid heater for contactless liquid level detection according to claim 1, characterized in that: The outer side wall of the glass body has a fixed area, and after the fixed area is fully coated with the glue, the first side surface is closely attached to the fixed area.

4. The liquid heater for contactless liquid level detection according to claim 2 or 3, characterized in that: The fixing area is an arc surface extending along the circumference of the glass cup body, the first side surface is a plane, the gap between the first side surface and the fixing area increases from the middle area to the two longitudinal edges, and the colloid fills the gap to support the detection plate.

5. The liquid heater for contactless liquid level detection according to claim 1, characterized in that: The colloid is a viscous glue, and the detection plate is fixedly connected to the glass cup body via the viscous glue.

6. The liquid heater for contactless liquid level detection according to claim 1, characterized in that: The colloid is a non-sticky glue, and a mounting bracket is provided on the outer side of the glass cup body, and the mounting bracket is fixedly connected to the glass cup body to press and fix the detection plate; or, the colloid is a non-sticky glue, and the shell is fixedly connected to the glass cup body to press and fix the detection plate.

7. The liquid heater for contactless liquid level detection according to claim 1, characterized in that: The outer peripheral side of the detection plate is provided with a first mold frame to prevent the colloid from overflowing. The first mold frame has a matching surface close to the outer wall of the glass cup body and an outer frame surface facing away from the glass cup body. The first mold frame and the fixed area form a accommodating cavity for accommodating the detection plate, and the second side surface is sunken relative to the outer frame surface.

8. The liquid heater for contactless liquid level detection according to claim 7, characterized in that: After the detection plate is fixed, the first mold frame is retained or removed.

9. The liquid heater for contactless liquid level detection according to claim 1, characterized in that: The second side surface is provided with electronic components, and the second side surface is coated with waterproof glue for encapsulating the electronic components.

10. The liquid heater for contactless liquid level detection according to claim 9, characterized in that: A second mold frame surrounding the electronic component is disposed on the second side surface, and the second mold frame is closely attached to the second side surface to prevent the waterproof glue from dispersing. After the waterproof glue solidifies, the second mold frame is retained or removed.

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