Liquid heater

Abstract

The invention belongs to the technical field of life electric appliances, and particularly relates to a liquid heater which comprises a cup body and is characterized in that the liquid heater further comprises a strip-shaped detection plate, the detection plate is vertically installed on the outer wall of the cup body and connected with a control device, the transverse width of the detection plate is b, and the transverse width of the detection plate is c; and the radius of the inner wall of the cup body in the corresponding area of the detection plate is r1, so that the detection accuracy of the detection plate is effectively improved, the redundant design of the detection plate is avoided, and the compact structure of the liquid heater is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliances, and particularly relates to a liquid heater. Background Art

[0002] There are mainly two existing anti-overflow detection methods for liquid heaters: one is contact anti-overflow electrode detection. When boiling, the slurry overflows and contacts the anti-overflow electrode, changing the potential of the anti-overflow electrode to achieve anti-overflow detection. When this detection method is applied to a liquid heater, the anti-overflow electrode must be set where the slurry in the cup can reach, which is easy to adhere to the slurry, bringing inconvenience to cleaning. And during the process of boiling the slurry, sometimes the foam of the slurry adheres to the anti-overflow electrode, causing continuous triggering, resulting in an unsatisfactory boiling situation of the slurry. The anti-overflow electrode cannot perform comprehensive detection of the water level and anti-overflow detection during the boiling process of the slurry, and the degree of intelligence is low.

[0003] There is also a non-contact anti-overflow detection. For example, the patents with application numbers CN200920132151.7 and CN200920291175.7 previously studied by the applicant solve the cleaning problem by hiding the annular capacitor plate in the machine head. However, due to the large circumferential size of the annular capacitor plate, on the one hand, it is difficult to process the capacitor plate, and on the other hand, it is difficult to hide and install. For example, the solutions disclosed in the application numbers CN201610753199.4 and CN201720526032.4, the existing non-contact anti-overflow detection technology mainly realizes non-contact liquid level detection or anti-overflow detection by setting a detection plate on the outer side of the insulating cup body. The detection plate is attached to the capacitor plate, and the capacitance of the detection plate changes with the volume of the food in the cup. The detection sensitivity and intelligence level are high. The detection plate usually adopts a strip-shaped plate, which is more convenient for assembly and production compared with the annular capacitor plate.

[0004] However, when selecting a detection plate, R & D personnel usually mainly consider whether it can be hidden and installed on the outer side of the cup and whether it can be reliably connected to the control device. Generally, when the detection plate can be successfully installed outside the cup, it will be directly selected. This causes manufacturers to purchase or produce a unified-size detection plate that can be compatible with multiple cup shapes for production convenience. Therefore, in different types of liquid heaters, a detection plate with a width of 1 cm (a detection plate specification commonly used in liquid heaters) is usually used for detection; or, existing R & D personnel will design the detection plate based on the experience of predecessors.

[0005] However, R & D personnel in this field have not discovered the technical problem that using a unified detection board for different cup bodies and the mismatch between the size of the detection board and the cup body size will affect the detection effect. During the R & D process, the inventor found that due to the great differences in the cup body sizes of liquid heaters, there will be technical problems of inaccurate detection when the width of the detection board is too large or too small. For example, small cups need to be designed for easy holding and carrying, and large cups need to have a production capacity of 1000 ml to meet user needs, so the cup diameter is too large to be grasped with one hand. The inner diameter differences of different cup bodies are 2 - 3 times. Even if a unified specification detection board can be compatibly assembled into current multiple models and reliably connected to the control device, the inventor found that when the unified specification detection board is assembled on the outer side of different cup bodies, the mismatch between the detection board and the cup body size will result in different detection accuracies. For small cup bodies, the flat detection board needs to be hidden, which causes the outer handle or shell of the cup body to need to be adaptively enlarged, and there may be a situation where the small cup body is tilted during the processing, resulting in the possibility of misjudgment by the detection board; when the detection board is applied to the outer side of a cup body with a larger cup diameter, due to the width limitation of the detection board, the detection area is limited, and it is impossible to achieve sensitive triggering. There is a high risk of overflow when the slurry is boiled beyond the preset position, and even if there is no overflow, a large amount of foam adheres to the cup lid.

[0006] Based on this, the inventor wants to develop a method of selecting a matching detection board for different cup bodies to ensure accurate and reliable detection, and the inventor has conducted further research. Summary of the Invention

[0007] The present invention provides a liquid heater. By using a detection board adapted to the cup body, it solves the problems in the prior art that due to the mismatch between the size of the detection board and the cup body size, there is a risk of misjudgment or insensitive triggering of the detection board, realizes the comprehensive detection of water level and anti - overflow, and improves the detection accuracy.

[0008] The present invention provides a liquid heater, including a cup body. The liquid heater further includes a strip - shaped detection board vertically installed on the outer wall of the cup body. The cup body is a glass cup body. The horizontal width of the detection board is b, and the inner wall radius of the cup body in the area corresponding to the detection board is r 1 , satisfying:

[0009] A liquid heater provided by the present invention realizes non-contact liquid level detection of a detection plate by arranging the detection plate on the outer wall of a cup body. For example, capacitance electrodes are arranged, and some of the multiple capacitance electrodes can be used to accurately detect the water level height, so that a control device performs a slurry production program corresponding to the water level. Or, for a liquid heater with automatic water inlet, functions such as water level in-place alarm are realized. At the same time, some of the multiple capacitance electrodes are used to realize accurate anti-overflow detection. Even when preparing slurries with different capacities, anti-overflow detection is realized, and comprehensive detection of the water level and anti-overflow detection is achieved, improving the intelligence of the liquid heater, being worry-free to use, and having various functions.

[0010] The inventor found that since the detection plate realizes detection by detecting the change of capacitance following the change of the volume of the slurry, the size, material, and thickness of the cup body affect the distance between the slurry and the conductive member (capacitance electrode), thereby affecting the effective detection range of the detection plate. At the same time, the width of the detection plate affects the effective detection width of the conductive member, the size of the effective detection area, and the size of the outer protective shell of the cup body. The detection plate is closely attached to the outer wall of the cup body, and the minimum detection distance between the detection plate and the slurry in the cup body is not less than the wall thickness of the cup body. And for the heating cup body to prevent heating rupture and the strength of the cup body itself, the thickness of the cup body is not less than 1 mm (the minimum thickness of the glass cup body used in the liquid heater). In addition, considering that the detection plate needs to have a certain lateral width to increase the detection area and detection width, the detection distance between the end (or edge) of the detection plate along the width direction and the slurry in the cup body, that is, the maximum detection distance, needs to be controlled within the effective detection range of the detection plate. After multiple tests on the detection plate, the inventor applied the maximum detection distance of 8 mm of the detection plate in various glass cup bodies on the premise of preventing redundant design and material waste of the detection plate. Therefore, by matching the width of the detection plate, the detection distance between the detection plate and the cup body is controlled within 1 - 8 mm, which can ensure the effective detection of the detection plate. If the detection plate is set too wide, resulting in the maximum distance between the detection plate and the cup body being greater than 8 mm, it may cause redundant design and material waste of the detection plate. And since the detection plate needs to be hidden and installed on the outer wall of the cup body by means of a handle or a protective shell, etc., too large a width of the detection plate will cause an increase in the size of the protective shell and the overall volume of the liquid heater, making it inconvenient to use. While if the detection distance between the end of the detection plate and the slurry in the cup body is smaller than 8 mm, it will result in a smaller width of the detection plate, a smaller detection area, which is not conducive to accurate detection. Especially in the case of a larger cup body size, it will cause insensitive detection, resulting in slurry overflow or the water level exceeding the preset value. Therefore, the size parameters of the detection plate and the size parameters of the cup body are designed in association to meet It can effectively improve the detection accuracy of the detection plate and avoid redundant design of the detection plate, realizing the structural compactness of the liquid heater.

[0011] In a preferred embodiment, the liquid heater further includes a handle fixed to the outer wall of the cup body, and the detection board is hidden and installed between the handle and the cup body.

[0012] In a preferred embodiment, the liquid heater further includes a housing sleeved outside the cup body. The detection board is located between the cup body and the housing, and the detection board is spaced from the inner wall of the housing.

[0013] The housing or the handle is used to comprehensively protect the detection board, prevent the detection board from being interfered by the outside, ensure the accuracy of detection, extend the service life of the detection board and improve the waterproof and dustproof effects of the detection board. At the same time, the detection board is not exposed, improving the aesthetics of the product. By using the handle to easily hold the cup body and realizing the hidden installation of the detection board, the housing can wrap the cup body and also play a heat insulation effect.

[0014] In a preferred embodiment, the inner wall radius of the housing in the area corresponding to the detection board is r 2 , satisfying:

[0015] By synchronously correlating the lateral width b of the detection board with both the inner wall radius of the housing and the inner wall radius of the cup body, the detection board not only changes according to the cup body size but also is flexibly selected according to the size of the housing. It not only realizes the matching of the lateral width of the detection board with the cup body to ensure the accurate detection of the detection board, but also effectively improves the protection effect of the housing on the detection board, prevents the detection board from being interfered by the outside, further improves the detection accuracy of the detection board, and improves the structural compactness of the liquid heater by correlating the width of the detection board with the housing size.

[0016] In a preferred embodiment, the liquid heater further includes a housing sleeved outside the cup body. An activity space is provided between the cup body and the housing. The detection board is arranged in the activity space. A pushing member is fixedly installed on the outside of the housing, and an avoidance through hole for the pushing member to push the detection board is provided on the side wall of the housing. After the cup body is inserted into the housing, the pushing member pushes the detection board to move radially until it abuts against the outer side wall of the cup body.

[0017] In a preferred embodiment, a guiding structure is further provided in the activity space. When the cup body is not inserted into the housing, the detection board is installed in the activity space through the guiding structure.

[0018] In a preferred embodiment, a spacer is provided between the pushing member and the detection board. The pushing member presses the spacer, and the detection board is pressed against the cup body through the spacer.

[0019] By setting up a detection board, the liquid level change in the cup body can be monitored in real time, and the state such as the position where the liquid level is located and the rising speed can be detected in real time, so as to realize the comprehensive detection of the water level height of the liquid level in the cup body and the anti-overflow signal, and then match the program control of the liquid heater, avoid the overflow of slurry or hot water, and be able to fully boil during the pulping process, improving the taste of the slurry. The detection board can be arranged in the movable space to have a first position. After setting up a pushing member and the cup body is inserted into the outer shell, the detection board is pushed by the pushing member to radially move from the first position to a second position where it abuts against the outer side wall of the cup body. According to the assembly progress, the assembly worker can flexibly change the different positions of the detection board. During the stage where the cup body needs to be sleeved, the detection board is kept in the first position to avoid friction between the cup body and the detection board during the process of the cup body being sleeved into the outer shell, which may cause the detection board to shift. This can not only realize the rapid assembly of the cup body but also avoid damage to the detection board, thus ensuring the effective and accurate detection of the detection board and improving the assembly efficiency. When the cup body has been inserted into the outer shell, the detection board is moved to the second position where it abuts against the outer side wall of the cup body, making the detection board closer to the liquid in the cup body, improving the sensitivity and accuracy of the detection board. And after the cup body is heated, the detection board can be kept in the second position where it abuts against the cup body, with reliable and lasting positioning of the detection board, thereby improving the sensitivity and accuracy of the detection board. The detection board can be pressed against the outer side wall of the cup body by the pushing member so that the detection board can be reliably kept in the second position where it abuts against the outer side wall of the cup body, with stable position of the detection board, ensuring the sensitivity of the detection.

[0020] By setting up a guiding structure, on the one hand, it plays a role in pre-positioning the detection board, keeping the detection board in the first position to avoid falling, and then facilitating the further movement of the position of the detection board; on the other hand, the guiding structure is in sliding fit with the detection board, so that the detection board moves precisely between the first position and the second position under the guiding action of the guiding structure. The detection board moves smoothly without jamming, and avoids skewing when the detection board reaches the second position, so that the detection board can be accurately matched with the preset liquid level height of the cup body to perform accurate anti-overflow or water level detection.

[0021] By installing an isolating member on the side wall of the outer shell, the isolating member is used to push the detection board to move from the first position in the movable space to the second position where it abuts against the outer side wall of the cup body, which is convenient for realizing the indirect pushing of the detection board, limiting the detection board to move along the set route, playing a certain guiding effect. Moreover, generally, an insulating shielding layer and leads and other structures are arranged on the outer side surface of the detection board. By using the movement of the isolating member to realize the movement of the detection board, it can avoid the shielding layer and leads being squeezed and damaged by directly pushing the detection board, and is conducive to the uniform force on the detection board, ensuring the stable movement of the detection board and the abutting effect between each part of the detection board and the cup body after moving to the second position, ensuring the effective and sensitive detection of the detection board.

[0022] In a preferred embodiment, a plurality of capacitive electrodes are arranged vertically and spaced apart on the side of the detection plate facing the cup body. The width of a single capacitive electrode is d, where 3 / 4b ≤ d ≤ b.

[0023] By setting the width of a single capacitive electrode to satisfy 3 / 4b ≤ d ≤ b, the effective and reasonable utilization of the width of the detection plate can be achieved within a limited space, avoiding redundant design of the detection plate, increasing the detection area of the detection plate, and making the detection accurate and reliable.

[0024] In a preferred embodiment, the detection plate includes a water level detection area and an anti-overflow detection area located above the water level detection area. The water level detection area is provided with a first capacitive electrode for detecting the water level, and the anti-overflow detection area is provided with a plurality of second capacitive electrodes for detecting anti-overflow signals, so that the detection plate has a plurality of anti-overflow detection positions. It can realize the comprehensive detection of the water level and anti-overflow in the cup body, improve the intelligence, and avoid the overflow of the slurry while achieving sufficient boiling when preparing soymilk.

[0025] In a preferred embodiment, the bottom end of the detection plate is not higher than the minimum capacity water level of the cup body. The vertical length of the detection plate is H, the height where the minimum capacity water level of the cup body is located is h1, and the height where the top end of the cup body is located is h2, where 2h1 ≤ H ≤ h2.

[0026] The bottom end of the detection plate is not higher than the minimum capacity water level of the cup body to ensure that there is space at the bottom of the detection plate to set the capacitive electrodes, so as to detect the water level when preparing the slurry with any capacity of the cup body, and the use is more reliable. The vertical length of the detection plate is H, the height where the minimum capacity water level of the cup body is located is h1, and the height where the top end of the cup body is located is h2, where 2h1 ≤ H ≤ h2. It can ensure that when the cup body is prepared with the minimum capacity, even if the bottom end of the detection plate is installed at the bottom end of the cup body, there is still a part of the detection plate exceeding the minimum capacity water level, so as to have enough space to set the capacitive electrodes to realize anti-overflow detection. At the same time, the vertical length of the detection plate is not greater than the height where the top end of the cup body is located, avoiding unnecessary loss of the detection plate material. Description of the Drawings

[0027] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 It is a schematic structural diagram of the liquid heater in Embodiment 1.

[0029] Figure 2 It is a schematic vertical sectional structural diagram of the cup body in Embodiment 1.

[0030] Figure 3Schematic cross-sectional structure diagram of the cup body in Example 1.

[0031] Figure 4 Schematic diagram of the cooperation between the cup body and the detection board in Example 1.

[0032] Figure 5 Schematic diagram of the cooperation between the cup body, the detection board and the outer shell in Example 2.

[0033] Figure 6 Schematic structure diagram of the liquid heater in Example 2.

[0034] Figure 7 Exploded structure diagram of the cup body and the outer shell in Example 2.

[0035] Figure 8 Schematic structure diagram of the detection board in Example 2.

[0036] Figure 9 Schematic cross-sectional structure diagram of the liquid heater in Example 2.

[0037] Figure 10 Installation schematic diagram of the outer shell and the detection board in Examples 2 and 3.

[0038] Figure 11 Schematic structure diagram of the silica gel pad in one implementation example of Example 2.

[0039] Figure 12 Schematic structure diagram of the silica gel pad in another implementation example of Example 2.

[0040] Figure 13 Schematic cross-sectional structure diagram of the liquid heater in Example 4.

[0041] Figure 14 Exploded diagram of the cup body and the outer shell in Example 4.

[0042] Figure 15 Installation schematic diagram of the outer shell and the detection board in Example 4.

[0043] Figure 16 Schematic partial cross-sectional structure diagram of the cup body in Example 4.

[0044] Figure 17 Schematic structure diagram of the spacer in Example 4.

[0045] Explanation of reference numerals:

[0046] 100, cup body; 102, cup lid; 101, installation cavity; 200, detection board; 201, water level detection area; 202, anti-overflow detection area; 203, capacitor electrode plate; 300, silicone pad; 310, first silicone sheet; 320, second silicone sheet; 400, handle; 500, crushing knife; 600, control device; 601, motor; 602, heating element; 700, spacer; 701, mounting post; 800, housing; 801, mounting groove; 802, mounting hole; 803, avoidance through-hole; 804, bolt; 900, guiding structure; 901, guiding post; 902, guiding hole. Detailed implementation manners

[0047] In order to more clearly illustrate the overall concept of the present invention, the following will be described in detail by way of examples in conjunction with the accompanying drawings of the specification.

[0048] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below. It should be noted that, without conflict, the embodiments of the present invention and the features in each embodiment may be combined with each other.

[0049] In addition, in the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0050] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0052] Embodiment 1

[0053] As Figures 1-4 shown, this embodiment provides a liquid heater, including a cup body 100, a crushing knife 500, a motor, a heating element 602, and a control device. The crushing knife 500 is located in the cup body 100 and is driven by the motor. The heating element 602 heats the cup body 100. Both the motor and the heating element 602 are connected to the control device 600. The liquid heater further includes a strip-shaped detection plate 200. The detection plate 200 is vertically installed on the outer wall of the cup body 100 and is connected to the control device. On the side of the detection plate 200 facing the cup body 100, a plurality of capacitor plates 203 are arranged at vertical intervals. The lateral width of the detection plate 200 is b, and the inner wall radius of the cup body 100 in the corresponding area of the detection plate 200 is r 1 , satisfying:

[0054] A liquid heater provided in this embodiment, by providing a detection plate 200 installed on the outer wall of the cup body 100, and on the side of the detection plate 200 facing the cup body 100, a plurality of capacitor plates 203 are arranged at vertical intervals. The capacitor plates 203 are connected to the control device, realizing non-contact liquid level detection of the detection plate 200. Through the plurality of capacitor plates 203 arranged at vertical intervals, some of the plurality of capacitor plates 203 can be used to realize accurate detection of the water level height, enabling the control device to perform a slurry production program corresponding to the water level, or, for a liquid heater with automatic water inlet, realizing functions such as water level in-place alarm. At the same time, some of the plurality of capacitor plates 203 are used to realize accurate anti-overflow detection. Even when preparing slurries of different capacities, anti-overflow detection is realized, achieving comprehensive detection of the water level and anti-overflow detection, improving the intelligence of the liquid heater, being worry-free to use, and having diverse functions.

[0055] The inventor found that since the detection board 200 realizes detection by the change of the capacitive electrode plate 203 following the volume change of the slurry, therefore, the size, material and thickness of the cup body 100 affect the distance between the slurry and the capacitive electrode plate 203, thereby affecting the effective detection range of the detection board 200. At the same time, the width of the detection board 200 affects the effective detection width of the capacitive electrode plate 203, the size of the effective detection area, and the size of the outer protective shell of the cup body 100. The detection board 200 is closely attached to the outer wall of the cup body 100, and the minimum detection distance between the detection board 200 and the slurry in the cup body 100 is not less than the wall thickness of the cup body 100. Considering that the detection board 200 needs to have a certain lateral width to increase the detection area and detection width, the maximum detection distance a between the end (or edge) of the detection board 200 in the width direction and the slurry in the cup body 100 needs to be controlled within the effective detection range of the detection board 200. Therefore, by matching the width of the detection board 200, the detection distance between the detection board 200 and the slurry in the cup body 100 is controlled within 1-8 mm, which can ensure the effective detection of the detection board 200, that is, 1 mm ≤ a ≤ 8 mm. If the detection board 200 is set too wide, resulting in the maximum detection distance between the detection board 200 and the slurry in the cup body 100 being too large and greater than 8 mm, it may cause redundant design and material waste of the detection board 200. And since the detection board 200 needs to be hidden and installed on the outer wall of the cup body 100 with the help of a handle 400 or a protective shell such as an outer shell, the too large width of the detection board 200 will cause the size of the protective shell to increase and the overall volume of the liquid heater to become larger, making it inconvenient to use. If the maximum detection distance between the end of the detection board 200 and the slurry in the cup body 100 is relatively small and less than 8 mm, it will cause the width of the detection board 200 to be small and the detection area to be small, which is not conducive to accurate detection. Especially when the size of the cup body 100 is large, it will cause insensitive detection and situations such as slurry overflow or the water level exceeding the preset value.

[0056] Therefore, the size parameters of the detection board 200 and the size parameters of the cup body 100 are designed in an associated manner.

[0057] Combined with Figure 4 , according to the Pythagorean theorem, When 1 mm ≤ a ≤ 8 mm, it is deduced that: The width of the detection board and the inner wall radius of the cup body satisfy the above relationship, which can effectively improve the detection accuracy of the detection board 200 while avoiding redundant design of the detection board 200 and realizing the structural compactness of the liquid heater.

[0058] In addition, more preferably, a silica gel pad is further clamped between the detection board and the outer wall of the cup body. The silica gel pad will increase the minimum detection distance between the detection board 200 and the slurry in the cup body 100. Therefore, preferably, the detection distance of the detection board is controlled within 5-8 mm, and the size parameters of the detection board 200 and the size parameters of the cup body 100 are designed in an associated manner to satisfy It can further improve the detection accuracy of the detection board 200 while avoiding redundant designs in the detection board 200, achieving a compact structure of the liquid heater.

[0059] In this embodiment, the liquid heater further includes a handle 400. The handle 400 is fixed to the outer wall of the cup body 100, and the detection board 200 is hidden and installed between the handle 400 and the cup body 100. The detection board 200 includes a water level detection area and an anti-overflow detection area located above the water level detection area. The water level detection area is provided with a first capacitor electrode plate for detecting the water level, and the anti-overflow detection area is provided with a plurality of second capacitor electrode plates for detecting anti-overflow signals, so that the detection board 200 has a plurality of anti-overflow detection positions. Among them, the width of a single capacitor electrode plate 203 is d, where 3 / 4b ≤ d ≤ b.

[0060] By setting the width of a single capacitor electrode plate 203 to satisfy 3 / 4b ≤ d ≤ b, the effective and reasonable utilization of the width of the detection board 200 can be achieved within a limited space, avoiding redundant designs of the detection board 200, increasing the detection area of the detection board 200, and making the detection accurate and reliable.

[0061] In this embodiment, not only is the lateral width of the detection board 200 matched with the size of the cup body 100, but also the vertical height of the detection board 200 is matched with the cup body 100. Specifically, the bottom end of the detection board 200 is not higher than the minimum capacity water level of the cup body 100. The vertical length of the detection board 200 is H, the height where the minimum capacity water level of the cup body 100 is located is h1, and the height where the top end of the cup body 100 is located is h2, where 2h1 ≤ H ≤ h2.

[0062] The bottom end of the detection board 200 is not higher than the minimum capacity water level of the cup body 100 to ensure that there is space at the bottom of the detection board 200 to set the capacitor electrode plate 203, so as to detect the water level during the preparation of the slurry with any capacity of the cup body 100, and the use is more reliable. The vertical length of the detection board 200 is H, the height where the minimum capacity water level of the cup body 100 is located is h1, and the height where the top end of the cup body 100 is located is h2, where 2h1 ≤ H ≤ h2. It can ensure that when the cup body 100 is prepared with the minimum capacity, even if the bottom end of the detection board 200 is installed at the bottom end position of the cup body 100, there is still a part of the detection board 200 that exceeds the minimum capacity water level, so as to have enough space to set the capacitor electrode plate 203 to achieve anti-overflow detection. At the same time, the vertical length of the detection board 200 is not greater than the height where the top end of the cup body 100 is located, avoiding unnecessary loss of the detection board 200 materials.

[0063] The liquid heater in this embodiment is a head-type soymilk machine. Of course, in fact, the liquid heater can also be a motor-down-type wall breaker, a hands-free wall breaker, etc.

[0064] In addition, it should be noted that the cup body 100 in this embodiment is a straight cylindrical shape with a consistent inner wall radius along the axial direction. Of course, in practice, the cup body can be a non-uniform diameter pulping cup body that is larger at the top and smaller at the bottom, and the cup body can also be a kettle body with unequal inner diameters applied to a health care kettle. Therefore, the inner wall radius r of the cup body 100 in the corresponding area of the detection plate 200 1 refers to the average radius after equivalent of the equal-area circles of each cross-section along the axial direction of the inner wall of the kettle body in the corresponding area of the detection plate 200.

[0065] Furthermore, the cross-section of the cup body in this embodiment is circular. In fact, the cup body is not limited to a cylindrical cup with a circular cross-section. The cup body can also adopt special-shaped cup bodies with a cross-section of a rounded rectangle, polygon, ellipse, etc. When the cup body adopts a special-shaped cup body, the inner wall radius r of the cup body 100 1 refers to the average radius of the inner wall after equivalent of the equal-area circles of each cross-section of the cup body in the corresponding area of the detection plate 200.

[0066] It can be understood that the capacitor electrode plate in this embodiment can be replaced with other conductive parts such as springs and conductive sheets.

[0067] Embodiment 2

[0068] As Figures 5-12 shown, this embodiment provides a liquid heater. On the basis of Embodiment 1, the liquid heater further includes a housing 800, a cup body 100 sleeved inside the housing 800, and a detection plate 200 for detecting the liquid level in the cup body 100. The cup body 100 is a glass cup body, and the detection plate 200 is strip-shaped and vertically arranged on the outside of the glass cup body. The detection plate is located between the cup body and the housing, and the detection plate is spaced from the inner wall of the housing.

[0069] As Figure 5 shown, the inner wall radius of the housing 800 in the corresponding area of the detection plate 200 is r 2 , according to the derivation of the Pythagorean theorem, Therefore, the derivation obtains:

[0070] Satisfy:

[0071] The principle is the same as that of Embodiment 1. According to the housing size and the radius size of the inner wall of the cup body, the detection distance between the detection plate 200 and the slurry in the cup body 100 is controlled within 1-8 mm, which can ensure the effective detection of the detection plate 200.

[0072] In this embodiment, by synchronously correlating the lateral width b of the detection plate with the inner wall radius of the outer shell and the inner wall radius of the cup body, the detection plate not only changes according to the cup body size, but also can be flexibly selected according to the size of the outer shell. This not only ensures that the lateral width of the detection plate matches the cup body to ensure accurate detection of the detection plate, but also effectively improves the protection effect of the outer shell on the detection plate, avoids interference from the outside world to the detection plate, further improves the detection accuracy of the detection plate, and improves the structural compactness of the liquid heater by correlating the width of the detection plate with the size of the outer shell.

[0073] In this embodiment, the liquid heater further includes an outer shell 800 sleeved outside the cup body. An activity space is provided between the cup body 100 and the outer shell. The detection plate 200 is arranged in the activity space. A pushing member is fixedly installed on the outer side of the outer shell. An avoidance through hole 803 for the pushing member to push the detection plate is provided on the side wall of the outer shell. After the cup body is inserted into the outer shell, the pushing member pushes the detection plate to move radially until it abuts against the outer side wall of the cup body. As Figure 7 shown, specifically, when the cup body 100 is not inserted into the outer shell 800, the detection plate 200 is in the first position A installed on the outer shell 800; after the cup body 100 is inserted into the outer shell 800, the detection plate 200 horizontally moves from the first position A to the second position B where it abuts against the outer side wall of the cup body 100. It can be understood that the second position B is closer to the cup body 100 than the first position A, so that the detection plate 200 is further close to the liquid in the cup body 100 after the cup body 100 is inserted into the outer shell 800, improving the detection accuracy. In addition, the detection plate 200 abuts against the outer side wall of the cup body 100, that is, there is an extrusion force between the detection plate 200 and the outer side wall of the cup body 100, and the detection plate 200 closely adheres to the outer side wall of the cup body 100, for example, by an external structure to press the detection plate 200 against the outer side wall of the cup body 100 to achieve this.

[0074] As Figure 8 shown, the detection plate 200 is provided with a water level detection area 201 and an anti-overflow detection area 202 located above the water level detection area. As Figure 8 shown, above the M line is the anti-overflow detection area 202, and below the M line is the water level detection area 201. Among them, a plurality of capacitor electrodes 203 are respectively arranged in the water level detection area 201 and the anti-overflow detection area 202. To realize the water level and anti-overflow detection when the soybean milk machine prepares different capacities.

[0075] The liquid heater provided by the present invention uses a glass cup body for the cup body 100. Compared with cup bodies made of other non-metallic materials such as ceramics, the glass cup body has good heat conduction performance and high heat transfer efficiency, making the anti-overflow control of the liquid heater sensitive. The inner wall of the glass cup body is smooth, which is convenient for cleaning, and when preparing the slurry, it can avoid the phenomenon of slurry sticking to the inner wall and bottom burning when the slurry is thick, making it convenient to use. By setting a detection plate 200 for detecting the liquid level in the cup body 100, the detection plate 200 is strip-shaped and vertically arranged on the outside of the glass cup body, and can monitor the change of the liquid level in the cup body 100 in real time, and detect the state such as the position where the liquid level is located and the rising speed in real time, so as to realize the comprehensive detection of the water level height of the liquid level in the cup body 100 and the anti-overflow signal, and then match the program of the liquid heater for sensitive control, avoid the overflow of the slurry or hot water, and can fully boil during the pulping process, improving the taste of the slurry. The detection plate 200 has a first position installed on the outer shell 800. After the cup body 100 is installed in the outer shell 800, the detection plate 200 moves horizontally from the first position to a second position where it abuts against the outer side wall of the cup body 100. According to the assembly progress, the assembly worker can flexibly switch the different positions of the detection plate 200. During the stage where the cup body 100 needs to be sleeved, the detection plate 200 is kept in the first position to avoid friction and deflection between the cup body 100 and the detection plate 200 during the process of the cup body 100 being sleeved into the outer shell 800, which can not only realize the rapid assembly of the cup body 100, but also avoid damage to the detection plate 200, thus ensuring the effectiveness and accuracy of the detection of the detection plate 200 and improving the assembly efficiency. When the cup body 100 has been installed in the outer shell 800, the detection plate 200 is moved to the second position where it abuts against the outer side wall of the cup body 100, making the detection plate 200 closer to the liquid in the cup body 100, improving the sensitivity and accuracy of the detection of the detection plate 200, and after the cup body 100 is heated, the detection plate 200 can be kept in the second position where it abuts against the cup body 100, and the positioning of the detection plate 200 is reliable and lasting, thereby improving the sensitivity and accuracy of the detection of the detection plate 200.

[0076] In one implementation example of this embodiment, in the state where the detection plate 200 is located at the first position A, during the process of the cup body 100 being sleeved onto the outer shell 800 from top to bottom, the detection plate 200 is separated from the outer wall of the cup body 100, that is, clearance fit. A silica gel pad 300 is provided inside the detection plate 200, and the silica gel pad 300 has a clearance fit with the outer wall of the cup body 100.

[0077] Of course, as another exemplary embodiment of this embodiment, when the detection plate 200 is in the first position A, the detection plate 200 is in sliding contact with the cup body 100. When a silica gel pad 300 is provided inside the detection plate 200, the detection plate 200 is in sliding contact with the outer wall of the cup body 100 through the silica gel pad 300. That is, the contact between the cup body 100 and the silica gel pad 300 still falls within the scope protected by the present invention. During the sleeving process of the cup body 100, the detection plate 200 is in sliding contact with the cup body 100, and there is no lateral extrusion force between the two. Therefore, even if the detection plate 200 is in sliding contact with the cup body 100, since the detection plate 200 has a certain strength, the difficulty of sleeving the cup body 100 can still be reduced and the installation efficiency of the cup body 100 can be improved without being damaged.

[0078] The liquid heater in this embodiment is a soymilk machine. As Figure 6 shown, a cup cover 102 is provided on the top end of the cup body 100. As Figure 10 shown, a crushing knife 500 is provided at the bottom of the cup body 100. An installation cavity 101 is formed between the lower part of the cup body 100 and the outer shell 800. A motor 601, a control device 600, and a heating element 602 are provided in the installation cavity 101. The rotating shaft of the motor 601 passes through the bottom wall of the cup body 100 and extends into the cup body 100 to be connected to the crushing knife 500.

[0079] Of course, it should be noted that the liquid heater provided in this embodiment is not limited to the above-mentioned soymilk machine. It can also be a head-type soymilk machine with the motor 601 placed above, a wall breaker including a base separated from the cup body 100, a liquid heater that does not need to be hand-washed, etc.

[0080] In this embodiment, as Figure 10 shown, a guiding structure 900 is provided between the cup body 100 and the outer shell 800. The detection plate 200 is vertically limited to be in the first position through the guiding structure 900, and the detection plate 200 is in sliding cooperation with the guiding structure 900 to switch between the first position and the second position. Among them, the guiding structure 900 includes an installation groove 801 provided on the inner side wall of the outer shell 800. The detection plate 200 is installed in the installation groove 801 and is in sliding cooperation with the groove side wall of the installation groove 801. A pushing member is fixedly installed on the outer side of the outer shell 800. As Figure 10 shown, the pushing member is a bolt 804. An avoidance through hole 803 for the pushing member to push the detection plate 200 is provided on the side wall of the outer shell 800. The avoidance through hole 803 is a screw hole that cooperates with the bolt 804. The pushing member presses the detection plate 200 against the outer side wall of the cup body 100. Of course, in fact, the pushing member can also be a handle 400.

[0081] By setting the installation groove 801 as the guiding structure 900, on the one hand, it plays a role in pre-positioning the detection plate 200, keeping the detection plate 200 in the first position to avoid falling, and thus facilitating the further switching of the position of the detection plate 200; on the other hand, the guiding structure 900 is in sliding fit with the detection plate 200, enabling the detection plate 200 to accurately switch between the first position and the second position under the guiding action of the guiding structure 900. The detection plate 200 moves smoothly without jamming, and the situation that the detection plate 200 is skewed when reaching the second position is avoided. Furthermore, the detection plate 200 can be accurately matched with the preset liquid level height of the cup body 100 to perform accurate anti-overflow or water level detection. The guiding structure 900 includes the installation groove 801 provided on the inner side wall of the outer shell 800. The detection plate 200 is installed by using the installation groove 801, realizing all-round limitation of the detection plate 200. It can not only perform vertical limitation on the length direction of the detection plate 200, but also perform left-right limitation on the width direction of the detection plate 200, making the detection plate 200 reliably pre-fixed on the outer shell 800, avoiding the falling or displacement of the detection plate 200 during the process of sleeving the inner cup, and ensuring the accurate installation position of the detection plate 200 after moving to the second position. The installation groove 801 is opened on the inner side wall of the outer shell 800 instead of the outer wall of the glass cup body, which can reduce the grooving difficulty and avoid damaging the glass cup body, improving the production yield and production efficiency. By fixedly installing a pushing member on the outer side of the outer shell 800, whether the pushing member is a handle 400 or a bolt 804, the detection plate 200 can be horizontally pushed inward while the pushing member is installed, making the detection plate 200 move smoothly. At the same time, the detection plate 200 is pressed against the outer side wall of the cup body 100 by the pushing member, enabling the detection plate 200 to be reliably held in the second position, and the position of the detection plate 200 is stable, ensuring the accuracy and reliability of the detection. When the pushing member is a handle 400, it is convenient to pick up and place the liquid heater, and the detection plate 200 can be hiddenly installed. When the pushing member is a bolt 804, the structure is simple and the operation is convenient.

[0082] In this embodiment, as Figure 10 shown, the liquid heater further includes a silica gel pad 300. The silica gel pad 300 is installed on the inner side of the detection plate 200. When the detection plate 200 is in the second position, the silica gel pad 300 is clamped between the detection plate 200 and the outer side wall of the cup body 100. Preferably, a sealing cavity for hermetically wrapping the detection plate 200 is provided between the silica gel pad 300 and the shell.

[0083] A silica gel pad 300 is clamped between the outer sidewall of the detection board 200 and the cup body 100. The detection board 200 is in close contact with the cup body 100 by squeezing the silica gel pad 300, achieving a flexible buffering effect and avoiding damage caused by hard contact between the capacitor electrode sheet 203 and the cup body 100. A sealing cavity that seals and wraps the detection board 200 is provided between the silica gel pad 300 and the positioning structure. The sealing cavity wraps and seals the detection board 200 in all directions, improving the waterproof property of the detection board 200 and ensuring the accuracy and effectiveness of the detection.

[0084] In an implementation example of this embodiment, as Figure 11 shown, the silica gel pad 300 is a single-piece type arranged on the inner side of the detection board 200. A hem that wraps the detection board 200 is provided at the edge of the silica gel pad 300 to improve the waterproof effect of the detection board 200. Of course, in another implementation example of this embodiment, as Figure 12 shown, the silica gel pad 300 includes a first silica gel sheet 310 and a second silica gel sheet 320 clamped on both sides of the detection board 200. One end (upper end) of the second silica gel sheet 320 is integrally connected to the first silica gel sheet 310 and can be folded open relative to the first silica gel sheet 310 for the detection board 200 to be inserted. Of course, in yet another implementation example, the first silica gel sheet 310 and the second silica gel sheet 320 can be separately arranged.

[0085] In this embodiment, the outer shell 800 adopts a transparent outer shell, realizing visualization of the liquid heating state in the cup body 100 on the premise of facilitating cleaning of the inner wall with a glass cup body, improving the user experience and enhancing the high-class sense of the product.

[0086] Embodiment 3

[0087] In this embodiment, as Figure 10 shown, the guiding structure 900 further includes a guiding column 901 protruding from the outer side surface of the detection board 200 and a guiding hole 902 penetrating through the side wall of the outer shell 800. The guiding column 901 is inserted into the guiding hole 902 and is in sliding fit with the guiding hole 902.

[0088] The guiding structure 900 includes the guiding column 901 and the guiding hole 902, with a simple structure and convenient setting. Since the guiding hole 902 penetrates through the side wall of the outer shell 800, the outer end of the guiding column 901 can be exposed from the guiding hole 902 when it is inserted into the guiding hole 902. Thus, it is convenient to use a pushing member to separately push the exposed end of the guiding column 901 to move the detection board 200. Therefore, by combining the guiding column 901 and the guiding hole 902, while guiding and limiting the detection board 200, it also plays a role in reasonably avoiding the shell to move the detection board 200, with a compact structure.

[0089] It should be noted that in this embodiment, the guiding structure 900 includes both the installation groove 801, and also includes the guiding column 901 and the guiding hole 902; actually, the guiding structure 900 may also only include the guiding column 901 and the guiding hole 902, and the setting of the installation groove 801 can be omitted.

[0090] In addition, it should be noted that in another implementation manner under this embodiment, the positions of the guiding column 901 and the guiding hole 902 can be swapped, that is, the guiding column 901 is arranged on the side wall of the housing and the guiding hole 902 is arranged on the detection plate 200.

[0091] Embodiment 4

[0092] As Figures 13-17 shown, the difference between this embodiment and Embodiment 3 is that when the detection plate 200 is in the first position A, the detection plate 200 is indirectly installed on the side wall of the housing 800 through the spacer 700. Specifically, the spacer 700 is installed on the side wall of the housing 800, the spacer 700 is limited by the installation groove 801, and the spacer 700 moves laterally relative to the housing 800 to push the detection plate 200 to move from the first position to the second position.

[0093] The detection plate 200 is installed on the spacer 700 and moves with the spacer 700. During the process of the detection plate 200 moving from the first position to the second position, the spacer 700 can be used for limiting, preventing the detection plate 200 from shifting during movement in the absence of the guiding structure 900, and ensuring the accurate installation position of the detection plate 200 after it moves to the second position. Specifically, the detection plate 200 is fixed by being wrapped by the silica gel pad 300 inside the spacer 700. Of course, the detection plate can also be pasted to the spacer 700; or, grooves can be provided on the spacer 700 to install the detection plate 200.

[0094] As Figure 15 shown, the spacer 700 is provided with an outwardly protruding mounting post 701, and the side wall of the housing 800 is provided with a mounting hole 802 for the mounting post 701 to protrude. The mounting post 701 and the mounting hole 802 are in sliding fit so that the spacer 700 can move laterally relative to the housing 800.

[0095] By providing the mounting posts 701 on the spacer 700 and the mounting holes 802 on the outer shell 800, the mounting posts 701 are slidably engaged with the mounting holes 802 to guide the movement of the spacer 700, avoiding the situation of jamming during the movement of the spacer 700 and enabling the spacer 700 to move smoothly. At the same time, the mounting posts 701 extend out of the mounting holes 802, exposing the outer ends of the mounting posts 701 from the mounting holes 802, thus facilitating the use of a pushing member to individually push the exposed ends of the mounting posts 701 to move the spacer 700. Therefore, the use of the mounting posts 701 and the mounting holes 802 can not only achieve the vertical limit between the spacer 700 and the outer shell 800, but also play a role in guiding the movement of the spacer 700, and also achieve the effect of reasonably avoiding the housing to move, with a compact structure.

[0096] As Figure 15 shown, a pushing member is fixedly installed on the outer side of the outer shell 800. An avoidance through-hole 803 for the pushing member to push the detection plate 200 is provided on the side wall of the outer shell 800. The pushing member presses the detection plate 200 against the outer side wall of the cup body 100. Preferably, the pushing member is a handle 400; alternatively, the pushing member is a bolt 804, and the avoidance through-hole 803 is a threaded hole that cooperates with the bolt 804.

[0097] By fixedly installing the pushing member on the outer side of the outer shell 800, regardless of whether the pushing member is a handle 400 or a bolt 804, the detection plate 200 can be pushed inward horizontally while the pushing member is installed, enabling the detection plate 200 to move smoothly. At the same time, by pressing the detection plate 200 against the outer side wall of the cup body 100 with the pushing member, the detection plate 200 can be reliably held in the second position, with the position of the detection plate 200 being stable, ensuring the accuracy and reliability of the detection. When the pushing member is a handle 400, it is convenient to pick up and place the liquid heater, and the detection plate 200 can be hiddenly installed. When the pushing member is a bolt 804, the structure is simple and the operation is convenient.

[0098] It should be noted that in this embodiment, since the detection plate 200 is driven by the spacer 700, the guiding structure 900 can be omitted between the cup body 100 and the outer shell 800. Of course, in practice, the guiding structure 900 can also be added to jointly guide the movement of the detection plate 200 with the spacer 700. Similarly, the pushing member can indirectly drive the detection plate 200 to move by pushing the spacer 700, avoiding the situation of damaging the detection plate 200 by directly pushing the detection plate 200.

[0099] In this embodiment, the liquid heater further includes a silica gel pad 300. The silica gel pad 300 is installed inside the detection board 200. When the detection board 200 is in the second position, the silica gel pad 300 is clamped between the detection board 200 and the outer side wall of the cup body 100. Preferably, a sealing cavity that seals and wraps the detection board 200 is provided between the silica gel pad 300 and the housing. In this embodiment, the sealing cavity is formed between the silica gel pad 300 and the spacer 700.

[0100] By providing the silica gel pad 300, the silica gel pad 300 is clamped between the detection board 200 and the outer side wall of the cup body 100, avoiding hard contact and collision between the detection board 200 and the cup body 100, playing a buffering effect, ensuring that the strip-shaped detection board 200 can be fully in contact with the arc-shaped outer side wall of the cup body 100, improving the detection accuracy of the detection board 200. At the same time, the silica gel pad 300 is beneficial to improving the sealing and waterproof performance of the detection board 200, preventing the detection board 200 from being damaged by water or being insensitive to detection.

[0101] It can be understood that in this embodiment, the spacer plays a role in protecting and installing the detection board. In fact, the spacer can only be used to isolate the detection board and the pushing member. For example, the spacer is made of a spring or a silica gel pad.

[0102] Embodiment 5

[0103] In this embodiment, a spacer 700 is installed on the side wall of the outer shell 800. The spacer 700 moves laterally relative to the outer shell 800 to push the detection board 200 from the first position to the second position. Different from Embodiment 3, the detection board 200 is separated from the spacer 700.

[0104] When the spacer 700 moves inward, the inner side surface of the spacer 700 pushes against the detection board 200 to cause the detection board 200 to move from the first position to the second position. Since the detection board 200 is separated from the spacer 700, the detection board 200 can optionally adopt the method of the above-mentioned Embodiment 2 or 3 to achieve limit installation with the outer shell 800 to stay in the first position.

[0105] By installing the spacer 700 on the side wall of the outer shell 800, the spacer 700 is used to push the detection plate 200 to move from the first position to the second position, which facilitates the indirect pushing of the detection plate 200, confines the detection plate 200 to shift on the set route, and has a certain guiding effect. Moreover, generally, an insulating shielding layer, leads and other structures are provided on the outer side surface of the detection plate 200. By using the movement of the spacer 700 to achieve the movement of the detection plate 200, it can avoid the shielding layer and leads from being squeezed and damaged caused by directly pushing the detection plate 200, and is conducive to the detection plate 200 being uniformly stressed, ensuring the stable movement of the detection plate 200 and the abutting effect between each part of the detection plate 200 and the cup body 100 after moving to the second position, and ensuring the effective and sensitive detection of the detection plate 200.

[0106] What is not described in the present invention can be realized by adopting or referring to the existing technology.

[0107] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized.

[0108] The above are only the embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A liquid heater, comprising a cup body, characterized in that, The cup body is a glass cup body. The liquid heater further includes a strip-shaped detection plate, which is vertically installed on the outer wall of the cup body. The lateral width of the detection plate is b, and the inner wall radius of the cup body in the area corresponding to the detection plate is r 1 , satisfying:

2. The liquid heater according to claim 1, characterized in that, the liquid heater further comprises a handle, the handle is fixed on the outer wall of the cup body, and the detection plate is hidden and installed between the handle and the cup body.

3. The liquid heater according to claim 1, characterized in that, the liquid heater further comprises a housing sleeved outside the cup body, the detection plate is located between the cup body and the housing, and the detection plate is spaced from the inner wall of the housing.

4. The liquid heater according to claim 3, characterized in that, The inner wall radius of the housing in the corresponding area of the detection board is r 2 , satisfying:

5. The liquid heater according to claim 1, characterized in that, the liquid heater further comprises a housing sleeved outside the cup body, an activity space is provided between the cup body and the housing, the detection plate is arranged in the activity space, a pushing member is fixedly installed on the outer side of the housing, an avoidance through hole for the pushing member to push the detection plate is provided on the side wall of the housing, and after the cup body is inserted into the housing, the pushing member pushes the detection plate to move radially until it abuts against the outer side wall of the cup body.

6. The liquid heater according to claim 5, characterized in that, a guiding structure is further provided in the activity space, and when the cup body is not inserted into the housing, the detection plate is installed in the activity space through the guiding structure.

7. The liquid heater according to claim 5, characterized in that, a separator is provided between the pushing member and the detection plate, the pushing member presses the separator, and the detection plate is pressed against the cup body through the separator.

8. The liquid heater according to claim 1, characterized in that, a plurality of capacitor plates arranged at intervals vertically are provided on the surface of the detection plate facing the cup body, the width of a single capacitor plate is d, wherein, 3 / 4b ≤ d ≤ b.

9. The liquid heater according to claim 1, characterized in that, the detection plate comprises a water level detection area and an anti-overflow detection area located above the water level detection area, the water level detection area is provided with a first capacitor plate for detecting the water level, and the anti-overflow detection area is provided with a plurality of second capacitor plates for detecting anti-overflow signals, so that the detection plate has a plurality of anti-overflow detection positions.

10. The liquid heater according to claim 1, characterized in that, the bottom end of the detection plate is not higher than the minimum capacity water level of the cup body, the vertical length of the detection plate is H, the height of the minimum capacity water level of the cup body is h1, and the height of the top end of the cup body is h2, wherein, 2h1 ≤ H ≤ h2.

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