CN117782260A - Liquid heater for detecting overflow prevention in space - Google Patents
Liquid heater for detecting overflow prevention in space Download PDFInfo
- Publication number
- CN117782260A CN117782260A CN202410210628.8A CN202410210628A CN117782260A CN 117782260 A CN117782260 A CN 117782260A CN 202410210628 A CN202410210628 A CN 202410210628A CN 117782260 A CN117782260 A CN 117782260A
- Authority
- CN
- China
- Prior art keywords
- detection
- overflow
- capacitance
- sub
- detection area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002265 prevention Effects 0.000 title claims abstract description 115
- 239000007788 liquid Substances 0.000 title claims abstract description 94
- 238000001514 detection method Methods 0.000 claims abstract description 342
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 136
- 238000004537 pulping Methods 0.000 claims abstract description 80
- 238000000034 method Methods 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 38
- 239000003990 capacitor Substances 0.000 claims description 99
- 230000006698 induction Effects 0.000 claims description 16
- 238000012937 correction Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 abstract description 58
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 40
- 230000008859 change Effects 0.000 description 21
- 239000000758 substrate Substances 0.000 description 21
- 239000011521 glass Substances 0.000 description 12
- 230000003071 parasitic effect Effects 0.000 description 11
- 235000013305 food Nutrition 0.000 description 9
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 8
- 101100207507 Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145) tri2 gene Proteins 0.000 description 7
- 101150066742 TRI1 gene Proteins 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000007689 inspection Methods 0.000 description 6
- 235000013322 soy milk Nutrition 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- -1 bubbles Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008258 liquid foam Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 235000020124 milk-based beverage Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The invention relates to kitchen appliances, in particular to a liquid heater for separating space and preventing overflow detection, wherein a water level detection area and an overflow detection area are arranged on a PCB detection board of the liquid heater, and a control chip is used for controlling the accumulated value of the increment of capacitance value detected by each sub-pole piece of a first sub-overflow detection area in the overflow detection processAnd the accumulated value of the increment of the capacitance value detected by each sub-pole piece of the second sub-overflow prevention detection areaIs used to determine the current spill-proof height. The liquid heater of the invention can realize water level signal detection and overflow prevention signal detection of a plurality of different pulping capacities at intervals, and can realize different pulping capacitiesThe intelligent preparation of thick liquid drink, moreover, the detection to the foam type thick liquid that produces in the slurrying process overflows the signal also more reliable, can more effectually discern anti-overflow signal, be difficult to have bubble, the overflow security risk of foam type thick liquid.
Description
Technical Field
The invention relates to kitchen appliances, in particular to a liquid heater for detecting air separation and overflow prevention.
Background
The prior art CN97225228.2 discloses a liquid level sensor which can not touch milk, but also can detect the position of the liquid level of milk, wherein the scheme particularly emphasizes that the liquid level sensor is suitable for various containers which are all non-metal containers and need to perform non-contact (air-isolation) liquid level control on the liquid level, because the conductive metal container can interfere the induction of the liquid level sensor, and the detection effect of the actual liquid level is affected. Meanwhile, the prior art CN200920291175.7 also discloses an easy-to-clean soymilk machine, which is provided with a capacitor plate capable of detecting the change of the liquid state, wherein the capacitor plate is a circular metal sheet or a plurality of capacitor plates arranged around a machine head or a cup body, and the overflow prevention, dry burning prevention and water level detection are realized by utilizing the capacitance induction effect. Compared with the prior soymilk machine, the soymilk machine has the advantages that the overflow-preventing electrode is not required to be perforated and installed on the lower cover of the machine head, so that the hidden danger of water inlet of the machine head can be reduced, and the cleaning convenience of the soymilk machine can be improved. However, the capacitor plate arranged on the soymilk machine needs to be arranged around the machine head or the cup body, the space occupied by the capacitor plate is large, and the installation is complex.
In order to further simplify a non-contact (spaced) capacitive liquid level detection device, the prior art discloses a capacitive water level electrodeless detection device, which comprises a capacitive slide bar formed by a plurality of capacitive sensors which are equidistantly arranged, wherein the capacitive slide bar is connected with a chip through a sensing wire, the chip is connected with a central processing unit through a signal wire, the central processing unit is connected with a water level display, during operation, data detected by the capacitive sensors are transmitted to the central processing unit under the control of the chip, and the central processing unit processes the received data and then transmits the processed data to the water level display so as to display the current water level condition. The water level detection device has the advantages that the structure is simple, the stepless detection of the water level can be realized, in addition, the detection mode is not influenced by water temperature, and the problem of inaccurate water level detection caused by the change of the detection environment and parasitic characteristics caused by other factors of water temperature and the like can be effectively avoided. The inventor researches and discovers that, for the scheme, although the signal induction detection of water has higher accuracy, for the detection of non-liquid water or other liquid substances, such as bubbles, foam, slurry substances and the like, on the one hand, the capacitance sensor senses smaller change of capacitance value due to slightly poor conductivity of the substances, and the chip cannot distinguish whether the liquid level signal or the parasitic capacitance. On the other hand, when bubbles, foam, particularly slurry foam, are generated in the liquid, a thicker foam layer is present above the liquid surface. Moreover, because the foam exists in the foam layer, the foam can be blocked to contact with the cup wall, so that gaps exist between the foam and the cup wall, the size of the capacitance value sensed by the capacitance sensor is affected, moreover, the surface of the foam layer is uneven, the foam in the central area of the general cup body is higher, the foam contacted with the cup wall is lower, even the foam contacted with different positions of the cup wall is different in height, the capacitance sensor can not sense a specific capacitance value or the sensed capacitance value is smaller, and therefore, the chip cannot recognize the specific position of the liquid level, so that the overflow safety risk easily exists, and the scheme is generally suitable for water level signal detection of health preserving kettles and the like.
Meanwhile, prior art CN201610753199.4 also discloses an anti-overflow method and a food processor, on which a signal PCB board is mounted, and metal sheets with the same size are equidistantly arranged on the signal PCB board. When the volume of the liquid level in the cup body is gradually increased, the capacitance formed by the metal sheet and the liquid in the cup body is increased, so that the liquid level is sensed by the metal sheet, and the detection of a water level signal and an anti-overflow signal is realized. However, the overflow prevention detection position is the highest fixed position on the PCB, and in the actual use process, the metal sheet below the overflow prevention detection position can identify the water level signal, but based on the characteristics of slurry foam and slurry foam, the fixed overflow prevention detection position is greatly influenced by external parasitic capacitance, and the overflow prevention signal of the slurry cannot be accurately identified. At the same time, the fixed overflow prevention detection position may cause a larger deviation of the detected overflow prevention position from the actual slurry position due to uneven surface of the slurry, and there is a safety risk of overflow.
In addition, the prior art cn201921962352.X also discloses a capacitive continuous liquid level detection structure having two induction electrode plates arranged in parallel and an electric kettle thereof, and also discloses a method of detecting the height of a water level by a duty ratio. In this scheme, the kettle body external surface of electric kettle is arc structure, consequently, need adopt soft PFB board to install on the kettle body outer wall through the mode of pasting, owing to be provided with two induction electrode pieces on the PFB soft board, the in-process that the water level risees, the arc arrangement is in the induction electrode piece on the kettle body outer wall can appear, the change of capacitance value can also be sensed to the induction position near actual water level top, and the water level and the actual water level that calculate according to the duty cycle can have obvious deviation, the accuracy of detection reduces, unfortunately to electric kettle, the detection deviation of water level is not serious, can not cause the security risk. However, the inventor researches and discovers that the scheme is only suitable for detecting the water level of the electric kettle, but cannot detect the anti-overflow signal, because the conductivity of bubbles and foam is reduced, the sensitivity of the induction electrode plate to the bubbles and foam is reduced, and the unevenness of the surfaces of the bubbles and the foam can further increase the error of detecting the arc-shaped PFB soft board, so that the scheme is not suitable for detecting the anti-overflow signal and is easy to have the safety risk of pulp overflow.
Disclosure of Invention
The invention aims to provide a liquid heater for detecting overflow prevention in a space, which can realize detection of water level signals with different pulping capacities and detection of overflow prevention signals corresponding to different pulping capacities in a space, can realize intelligent production of slurry drinks with different pulping capacities, is more reliable in detection of foam type slurry overflow signals generated in the pulping process, can more effectively identify the overflow prevention signals, and is not easy to have overflow safety risks of bubbles and foam type slurry.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a separate liquid heater that anti-overflow detected, includes slurrying container, installs in slurrying container outer wall and is used for detecting liquid level's PCB pick-up plate, its characterized in that: the PCB detection board is provided with a water level detection area and an overflow prevention detection area, the overflow prevention detection area is positioned above the water level detection area, the water level detection area is provided with a plurality of first capacitor pole pieces used for detecting water level signals, the overflow prevention detection area is provided with a plurality of second capacitor pole pieces used for detecting overflow prevention signals, the overflow prevention detection area comprises a first sub overflow prevention detection area and a second sub overflow prevention detection area which are divided into a side-by-side arrangement by dividing grooves, the dividing grooves are straight-line dividing grooves which are obliquely arranged relative to the PCB detection board, the single second capacitor pole piece is divided into two sub pole pieces which are respectively positioned in two columns of sub overflow prevention detection areas by the dividing grooves, the PCB detection board is also provided with a control chip which is respectively connected with the first capacitor pole pieces and each sub pole piece, at least under the same overflow prevention height below the top end of the first sub overflow prevention detection area is not equal to the induction area of the second sub overflow prevention detection area, wherein in the overflow prevention detection process of the PCB detection board is carried out by the control chip, the control chip obtains the increment of the capacitance value of each sub overflow prevention detection area of the first sub overflow prevention detection area respectively And the accumulated value of the capacitance increment detected by each sub-pole piece of the second sub-overflow prevention detection area +.>And according to->And->Is used to determine the current spill-proof height.
Further, the control chip presets the height ratio K of the first sub-overflow prevention detection area and the second sub-overflow prevention detection area at the same overflow prevention height 0 In the process of the anti-overflow detection, the control chip calculates the increment ratio K of the capacitance values of the first sub-anti-overflow detection area and the second sub-anti-overflow detection area, and the control chip calculates the increment ratio K of the capacitance values of the first sub-anti-overflow detection area and the second sub-anti-overflow detection area according to the K and the K 0 Is used to determine the current spill-resistant height.
Further, the control chip is pre-provided with the total height H of the anti-overflow detection area, in the anti-overflow detection process, the control chip calculates the increment ratio K of the capacitance values of the first sub-anti-overflow detection area and the second sub-anti-overflow detection area, and the control chip determines the current anti-overflow height according to the proportion of K to H.
Further, the areas of the first sub-overflow prevention detection area and the second sub-overflow prevention detection area are equal;
alternatively, the control chip corrects the calculated K value according to different liquid heaters, k=，Is a correction coefficient.
Further, the plurality of first capacitor pole pieces are arranged at intervals from bottom to top in the water level detection area according to L1 to Ln marks, wherein in the water level detection, the capacitance difference value of two adjacent first capacitor pole pieces is that When->When the water level is the maximum value, the control chip confirms that the current water quantity added into the pulping container is the water level corresponding to the first capacitance pole piece Ln, and n is the number of the first capacitance pole pieces.
Further, after the control chip confirms that the current water level corresponds to the first capacitance pole piece L, the PCB detection board also has rechecking detection on the water level, and when the water level rechecking detection is performed, the control chip judges whether the current water level is greater than a preset fluctuation threshold value or not according to the fluctuation quantity of the capacitance value sensed by the single first capacitance pole piece.
Further, in the water level detection process, the control chip sequentially and circularly detects the capacitance value of each first capacitance pole piece in set time, and at any moment, only one first capacitance pole piece is electrified for detection, and the rest first capacitance pole pieces are set for grounding treatment;
or in the process of anti-overflow detection, the control chip sequentially and circularly detects the capacitance values of all the second capacitance pole pieces in set time, and at any moment, only one second capacitance pole piece is electrified for detection, and the other second capacitance pole pieces are set for grounding treatment.
Further, the anti-overflow detection bits corresponding to the different second capacitor pole pieces are different, and the pulping programs corresponding to the different anti-overflow detection bits are different.
Further, the first capacitor pole pieces are equidistantly arranged in the water level detection area, and the detection height of a single first capacitor pole piece is h n =Wherein V is L For minimum pulping capacity of pulping vessel, V H The pulping container is of a cylindrical structure, r is the radius of the cylindrical pulping container, n is the number of the first capacitance pole pieces, and the distance between the adjacent first capacitance pole pieces is ∈>。
Further, the second capacitor pole pieces are equidistantly arranged in the anti-overflow detection area, and the detection height of a single second capacitor pole piece is h N =The height from the lowest end of the water level detection area to the uppermost end of the overflow prevention detection area is H m N is an anti-overflow detection gear number corresponding to different pulping capacities, and the interval between adjacent second capacitor pole pieces isWherein, the method comprises the steps of, wherein,/>n is more than or equal to N and N is an integer.
In the prior art, the principle of spaced touch sensing is also utilized for detecting the water level and the anti-overflow signal by the capacitor pole piece, when the capacitor pole piece is close to liquid, a capacitance value is generated by sensing, and the control chip indirectly judges the water level signal and the anti-overflow signal according to fluctuation and change of the capacitance value. The inventor finds that the capacitance value of the liquid signal sensed by the capacitance pole piece has larger variation range, when the distance between the capacitance pole piece and the liquid is shorter, the fluctuation of the capacitance value is larger, and when the distance between the capacitance pole piece and the liquid is longer, the fluctuation of the capacitance value generated by the capacitance pole piece is smaller, meanwhile, the fluctuation of the capacitance value generated by the capacitance pole piece is also related to the liquid form and the conductivity, when the liquid is in a pure liquid state and the conductivity is stronger, the fluctuation of the sensed capacitance value is larger, the accurate detection of the liquid level can be realized, and when the liquid is in a bubble and foam state, the fluctuation of the sensed capacitance value is relatively smaller due to the reduction of the conductivity. When the liquid is in a bubble and foam state, the control chip cannot judge whether the liquid level signal is generated because the fluctuation of the capacitance value sensed by the capacitance pole piece is small. In addition, the capacitance value change generated by the capacitance pole piece is also influenced by environmental factors, parasitic capacitance is easy to form, the parasitic capacitance can also enable the capacitance pole piece to sense smaller capacitance value fluctuation, and the control chip can also have the possibility of misjudgment. For example, when a hand approaches to the capacitance pole piece, fluctuation of the capacitance value can be generated, at this time, the control chip cannot distinguish whether the capacitance value is interfered or the actual liquid level capacitance value, or the fluctuation of the capacitance value can be sensed by the capacitance pole piece due to water drops on the outer wall of the pulping container, and misjudgment exists in the control chip. In addition, although the existing capacitance pole piece can be used for detecting water level signals and overflow prevention signals, the existing capacitance pole piece for fixing overflow prevention can not accurately identify the actual height of the slurry due to uneven surface of the slurry formed by bubbles, foam and the like, and the overflow phenomenon of the slurry is easy to occur.
For the liquid heater provided by the invention, the water level detection areas and the overflow prevention detection areas which are respectively formed by a plurality of first capacitor pole pieces and a plurality of second capacitor pole pieces in a spaced mode are arranged on the PCB detection board, so that the water level detection of a plurality of different pulping capacities can be realized at intervals, and the detection of different overflow prevention signals corresponding to the different pulping capacities can also be realized at intervals. In addition, the invention adopts different pulping capacities to correspond to different anti-overflow detection positions, thereby not only ensuring that the problem of slurry overflow can not occur, but also ensuring that the space utilization rate of the pulping container is higher, realizing the optimization of pulping efficiency and avoiding the problems of overlong pulping time or poor crushing.
The anti-overflow detection area of the liquid heater PCB detection board is also provided with a division groove which is obliquely arranged relative to the PCB detection board, the anti-overflow detection area is divided into a first sub-anti-overflow detection area and a second sub-anti-overflow detection area which are arranged side by the division groove, a single second capacitance pole piece is divided into two sub-pole pieces which are respectively positioned in two rows of sub-anti-overflow detection areas by the division groove, the first capacitance pole piece and each sub-pole piece are respectively and electrically connected with a control chip on the PCB detection board, and at least under the same anti-overflow height below the top end of the highest second capacitance pole piece, the induction area of the first sub-anti-overflow detection area is unequal to the induction area of the second sub-anti-overflow detection area. The liquid heater for detecting the space-apart overflow-prevention detection is provided with a water level detection for detecting the water quantity added into a pulping container before pulping and an overflow-prevention detection for detecting the height of the pulp in the pulping process. In the anti-overflow detection process, a control chip on the PCB detection board respectively obtains accumulated values of capacitance value increment detected by each sub-pole piece of the first sub-anti-overflow detection area And the accumulated value of the capacitance increment detected by each sub-pole piece of the second sub-overflow prevention detection area +.>And according toAnd->Is used to determine the current spill-proof height. Because the foam on the surface of the slurry is uneven in the pulping process, the accumulated values of the capacitance values detected by the two sub-overflow prevention detection areas are obtained respectively for ratio comparison, and an overflow prevention signal which is closer to the actual overflow prevention detection position can be obtained, so that the overflow of the slurry such as bubbles, foam and the like in the pulping process is effectively avoided. Therefore, compared with the prior art, when the liquid heater is used for detecting the overflow prevention signal, the detection is more reliable, and the safety risk of slurry overflow is less likely to exist.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic view of a liquid heater according to a first embodiment of the present invention;
FIG. 2 is a schematic view of the front surface structure of the PCB inspection board in FIG. 1;
FIG. 3 is a schematic view of the rear surface structure of the PCB inspection board in FIG. 1;
FIG. 4 is a block diagram of a topology of the PCB test board of FIG. 1;
fig. 5 is a schematic structural diagram of a second embodiment of a PCB inspection board according to the present invention.
Detailed Description
Embodiment one: fig. 1, 2, 3 and 4 show a schematic structure of a liquid heater according to the present invention. The liquid heater is a food processor for making soybean milk beverage, including forming the glass cup 1 of slurrying container 10 and lid 2 of lid dress on glass cup 1, glass cup 1 bottom is provided with the heating device 4 that heats slurrying container 10, and is provided with motor 3 in the installation cavity 20 of glass cup 1 below, the pivot that is driven by motor 3 runs through glass cup 1 bottom and stretches into slurrying container 10 in, and the end-to-end connection of pivot has reducing mechanism (not mark in the picture), install the PCB pick-up plate 5 that is used for liquid level detection on the lateral wall outside of glass cup 1, PCB pick-up plate 5 installs between glass cup 1 and handle (not mark in the picture), and still be provided with master control device (not shown in the picture) in the installation cavity 20 of glass cup 1 below, master control device is connected with motor 3, heating device 4 and PCB pick-up plate 5 electricity respectively.
The PCB detecting board 5 includes a strip-shaped substrate 51, a capacitor pole piece mounted on the substrate, a control chip 52 and an output terminal 53, the capacitor pole piece is electrically connected with the control chip 52, the control chip 52 is connected with a main control device through the output terminal 53, the capacitor pole piece includes a plurality of first capacitor pole pieces 54a and a plurality of second capacitor pole pieces 54b which are arranged at intervals, the first capacitor pole pieces 54a form a water level detecting area 55a (a dashed line box below a W plane) on the substrate 51, the second capacitor pole pieces 54b form an overflow preventing detecting area 55b (a dashed line box above the W plane) on the substrate 51, the overflow preventing area 55b is located above the water level detecting area 55a, wherein the different first capacitor pole pieces 54a correspond to different pulping capacities on the water level detecting area 55a, the different second capacitor pole pieces 54b correspond to different overflow preventing detecting positions on the overflow detecting area 55b, and each pulping capacity on the water level detecting area 55a corresponds to the second capacitor pole pieces 54b on the overflow preventing detecting area 55 b. And, the plurality of first capacitor pole pieces 54a and the plurality of second capacitor pole pieces 54b are respectively electrically connected to the control chip 52 one by one through printed circuits (not shown) on the substrate 51, and along the height direction of the substrate 51, the detection height of the single first capacitor pole piece 54a is smaller than the detection height of the single second capacitor pole piece 54 b.
In this embodiment, the first capacitor pole piece 54a and the second capacitor pole piece 54b are both attached to the front surface of the side of the substrate 51 facing the glass body 1, while the control chip 52 and the output terminal 53 are disposed on the rear surface of the substrate 51, and the control chip 52 and the output terminal 53 are both located below the water level detection area 55. Meanwhile, the substrate 51 is further covered with a grid shielding layer, the grid shielding layer is grounded, the grid shielding layer includes a first shielding layer 57a covered on the rear surface of the substrate 51 and a second shielding layer 57b covered on the front surface of the substrate 51, the second shielding layer 57b is enclosed along the edge of the substrate 51 outside the water level detection area 55a and the anti-overflow detection area 55b, and the lower side of the second shielding layer 57b is provided with an opening 571. In this embodiment, the grid shielding layer is a copper-clad grid, and is used for shielding the induction interference of the external parasitic capacitor on the capacitor pole piece. In the present embodiment, a printed wiring is attached to the rear surface of the substrate 51, and input terminals are electrically connected to the respective capacitor pole pieces through the substrate 51, and output terminals of the printed wiring are routed along the outer peripheral edge of the mesh shielding layer, wherein the output terminals of the printed wiring can be electrically connected to the control chip 52 through the lower side opening of the second shielding layer 57 b.
In this embodiment, the overflow preventing area 55b of the substrate 51 is provided with a dividing groove 58, the dividing groove 58 divides the overflow preventing area 55b into a first sub-overflow preventing area tri1 and a second sub-overflow preventing area tri2 which are arranged side by side, each second capacitor pole piece 54b is divided into two sub-pole pieces respectively located in two columns of sub-overflow preventing areas, and each sub-pole piece of the two columns of sub-overflow preventing areas is respectively electrically connected with the control chip 52 through a printed circuit, wherein the sensing area of the first sub-overflow preventing area tri1 is not equal to the sensing area of the second sub-overflow preventing area tri2 under the same liquid level height below the highest point of the overflow preventing area 55b, and in this embodiment, the dividing groove 58 is inclined along the diagonal line of the overflow preventing area 55b to divide the overflow preventing area 55b into two triangular sub-overflow preventing areas with equal areas.
In the prior art, the principle of spaced touch sensing is also utilized for detecting the water level and the anti-overflow signal by the capacitor pole piece, when the capacitor pole piece is close to liquid, a capacitance value is generated by sensing, and the control chip indirectly judges the water level signal and the anti-overflow signal according to fluctuation and change of the capacitance value. The inventor finds that the capacitance value of the liquid signal sensed by the capacitance pole piece has larger variation range, when the distance between the capacitance pole piece and the liquid is shorter, the fluctuation of the capacitance value is larger, and when the distance between the capacitance pole piece and the liquid is longer, the fluctuation of the capacitance value generated by the capacitance pole piece is smaller, meanwhile, the fluctuation of the capacitance value generated by the capacitance pole piece is also related to the liquid form and the conductivity, when the liquid is in a pure liquid state and the conductivity is stronger, the fluctuation of the sensed capacitance value is larger, the accurate detection of the liquid level can be realized, and when the liquid is in a bubble and foam state, the fluctuation of the sensed capacitance value is relatively smaller due to the reduction of the conductivity. When the liquid is in a bubble and foam state, the control chip cannot judge whether the liquid level signal is generated because the fluctuation of the capacitance value sensed by the capacitance pole piece is small. In addition, the capacitance value change generated by the capacitance pole piece is also influenced by environmental factors, parasitic capacitance is easy to form, the parasitic capacitance can also enable the capacitance pole piece to sense smaller capacitance value fluctuation, and the control chip can also have the possibility of misjudgment. For example, when a hand approaches to the capacitance pole piece, fluctuation of the capacitance value can be generated, at this time, the control chip cannot distinguish whether the capacitance value is interfered or the actual liquid level capacitance value, or the fluctuation of the capacitance value can be sensed by the capacitance pole piece due to water drops on the outer wall of the pulping container, and misjudgment exists in the control chip. In addition, although the existing capacitance pole piece can be used for detecting water level signals and overflow prevention signals, the existing capacitance pole piece for fixing overflow prevention can not accurately identify the actual height of the slurry due to uneven surface of the slurry formed by bubbles, foam and the like, and the overflow phenomenon of the slurry is easy to occur.
For the food processor of this embodiment, be provided with the water level detection zone and the anti-overflow detection zone by a plurality of first electric capacity pole pieces and a plurality of second electric capacity pole piece interval arrangement respectively on the PCB pick-up plate, both can realize the water level detection of multiple different slurrying capacities, also can realize the detection of multiple different slurrying capacities corresponding different anti-overflow signals, compare in the anti-overflow detection position of current only a fixed position, the food processor of this embodiment can realize more intelligent preparation thick liquid drink, slurrying efficiency is higher, when having guaranteed the preparation of one at most manyfold drink, can also solve only that one fixed anti-overflow detection position appears inefficacy easily in the prior art, anti-overflow time overlength, the problem of thick liquid foam wall built-up adhesion. In addition, the embodiment adopts different anti-overflow detection positions corresponding to different pulping capacities, so that the problem that the pulp overflows is not guaranteed, the space utilization rate of the pulping container is higher, the optimization of pulping efficiency can be realized, and the problems of overlong pulping time or poor crushing are avoided.
The first capacitor pole piece of the water level detection area is used for detecting the pulping water level under the corresponding pulping capacity, the second capacitor pole piece of the overflow prevention detection area is used for detecting the overflow prevention height reached by the slurry under the corresponding pulping capacity in the pulping process, and when the second capacitor pole piece detects that the slurry with the current pulping capacity reaches the preset overflow prevention detection position, the control chip can transmit signals to the main control device, and the main control device performs corresponding operations, such as motor stalling, heating stopping and the like, according to program setting to perform overflow prevention waiting. However, in the pulping process, when the slurry is whipped or heated, substances such as bubbles and foam are generated on the surface of the slurry to rise, and the capacitance value fluctuation of the bubbles and the foam induced by the capacitance pole pieces is small, so that the control chip cannot accurately determine whether the control chip is parasitic capacitance or an actual anti-overflow signal. For the food processor of this embodiment, because the detection height of a single second capacitance pole piece is greater than the detection height of a single first capacitance pole piece, therefore, the second capacitance pole piece has a larger sensing area during actual detection, can obtain a larger fluctuation capacitance value, realize more accurate anti-overflow signal detection, compared with the prior art, can realize detection of rising anti-overflow signals such as bubbles and foam, effectively solve the problem that the existing single type capacitance pole piece can only accurately detect water level but can not effectively detect anti-overflow signals, and greatly reduce the overflow safety risk of slurry such as bubbles and foam in the application process of the existing capacitance anti-overflow detection technology.
Because the non-contact type (spaced) PCB detection board is attached to the outer side of the glass, the non-contact type (spaced) PCB detection board is used for detecting and judging liquid level signals according to the change condition of detection capacitance values, and the situations that water flow exists in the use process of a user, the user touches the position of the installation structure of the PCB detection board and the like can cause the change of the capacitance values of the capacitance pole pieces on the PCB detection board, so that the risks of abnormal liquid level detection, overflow in the pulping process and the like are caused. In the embodiment, the three surfaces of the water level detection area and the overflow prevention detection area on the substrate of the PCB detection board and the grid copper-clad shielding mode of the rear surface of the substrate can eliminate the influence of external induction interference on the capacitor pole pieces to the greatest extent, so that the problem that the detection result is abnormal due to fluctuation abnormality of the capacitor value caused by existence of condensed water on the side surface of the assembled PCB detection board or hand touch of a user is effectively solved, and the detection reliability is ensured.
It should be noted that, the pulping container in this embodiment is straight barrel shape, and the PCB pick-up plate both can be used for the detection of water level signal, also can be used for the detection of anti-overflow signal, and the base plate of PCB pick-up plate is the stereoplasm board, and the vertical arrangement of PCB pick-up plate is on the outer wall of pulping container, can effectively avoid pulping container's arc structure to cause the electric capacity pole piece to sense non-desirability capacitance value. In this embodiment, the minimum pulping capacity is not lower than the lower limit of the lowest first capacitor pole piece, so that at least one capacitor pole piece can detect the water level. And the maximum pulping capacity is not higher than the lower limit of the lowest second capacitance pole piece or is positioned between the highest first capacitance pole piece and the lowest second capacitance pole piece so as to ensure that at least one interelectrode capacity value difference detection judgment point exists. Similarly, the minimum anti-overflow detection position is not lower than the lowest second capacitance pole piece, so that the second capacitance pole piece can sense an anti-overflow signal, and the maximum anti-overflow detection position corresponding to the maximum pulping capacity is lower than the lower limit of the highest second capacitance pole piece, so that the highest second capacitance pole piece can be used as the last auxiliary anti-overflow safety detection.
In the present embodiment, the first capacitor plates on the water level detection area are equidistantly arranged, and the detection height h of the water level detection area is actually the maximum pulping capacity V H And minimum pulping capacity V L The height between the two is as follows: h=Wherein r is the radius of the pulping container, n is the number of the first capacitance pole pieces, +.>For the distance between adjacent first capacitor pole pieces, < >>Is the detection height of the single first capacitance pole piece. It can be seen that for the first capacitor pole piece of this embodiment, the first capacitor pole piece is +.>. In this embodiment, the water level detection area is provided with n first capacitor pole pieces, that is to say, the water level detection area has n different pulping capacities.
In the embodiment, the second capacitance pole piece on the anti-overflow detection area is also as followsWherein the spacing between the highest first capacitive pole piece and the lowest second capacitive pole piece is also +.>. Meanwhile, in this embodiment, N different pulping capacities are provided, and the overflow prevention detection areas have corresponding overflow prevention detection gear positions, where the overflow prevention detection gear positions are set to N, and meanwhile, in order to increase the safety of overflow prevention detection, a second capacitor pole piece needs to be added on the substrate to be used as an overflow prevention detection pole, based on this, the number of second capacitor pole pieces in the overflow prevention detection areas is n+1, the first N second capacitor pole pieces correspond to N overflow prevention detection positions, and the N overflow prevention detection positions correspond to N different pulping capacities. Set H m The detection height of the PCB detection board is the sum of the height of the water level detection area and the height of the anti-overflow detection area. Wherein the height of the anti-overflow detection zone satisfies h=h m -h=(N+1)h N +N，h N For the detection height of a single second capacitive pole piece, i.e. h N =/>And N satisfy: />N is more than or equal to N and N are integers.
Detection height h of a single first capacitor pole piece n The detection height h of a single second capacitance pole piece is selected to be 3 mm-6 mm N The detection height of the single first capacitor pole piece is generally not less than 2 times and is generally 8-12 mm, wherein the preferred choice of the first capacitor pole piece is 4-5 mm, and the preferred choice of the second capacitor pole piece is 10mm.
It should be noted that, the capacitor pole piece at the highest position of the anti-overflow detection area is used for assisting in detecting dangerous overflow signals, so that overflow safety risk caused by failure of the maximum anti-overflow detection gear corresponding to the maximum pulping capacity can be effectively prevented, and the method is the last safety guarantee for preventing slurry from overflowing. Therefore, for the present embodiment, a third capacitor pole piece may be further separately disposed on the substrate above the overflow prevention detection area, as the detection of the auxiliary dangerous overflow signal. At this time, the number of the second capacitor pole pieces corresponding to the water level detection area is the same as the anti-overflow gear number, and is N, and the detection height of a single second capacitor pole piece meets h N =。
As shown in fig. 4, in the circuit layout topology diagram of the PCB detection board of this embodiment, the non-contact (spaced) PCB detection board includes a control portion and an electrode portion (capacitor electrode sheet), the electrode portion is configured with a plurality of segments of capacitor electrode sheets respectively connected with a control MCU (control chip) one by one, a device of the control portion is disposed on the other surface of the substrate opposite to the capacitor electrode sheet, an interface module (output terminal) is disposed at the bottom of the control portion, a terminal of the interface module adopts a patch mode, a control MCU is disposed at the upper portion of the interface portion, and a reset circuit module, a power circuit module, an output circuit module and a burning port are respectively configured at two sides of the control MCU. The control MCU is provided with a rewritable storage module, and can repeatedly update the control program to the storage module through the burning port, so that the control program can be updated. For the embodiment, the reliability of the control system is guaranteed through the topology structure setting of the PCB detection board, meanwhile, the setting of the interface position guarantees the minimum installation position, and the cost of the PCB detection board is reduced while the reliability is improved. In addition, the capacitor pole pieces and other devices are arranged in a partitioning mode, so that the anti-interference capability is improved, and the reliability is guaranteed.
For the PCB inspection board of this embodiment, different inspection control methods are used for different pulping stages. Wherein, the food processor of this embodiment is in the in-process of making the drink, and the PCB pick-up plate has the water level detection stage that detects user's water addition or automatic water feeding and is used for detecting the anti-overflow detection stage in the slurrying process.
Water level detection: and a control chip on the PCB detection board starts to detect the capacitance value on the first capacitance pole piece in real time, and judges and confirms whether the material placed by the user reaches a preset water level. In the real-time detection process, only one of the plurality of first capacitor pole pieces is in an induction state at a certain moment, and other capacitor pole pieces are grounded, so that only one capacitor at each circulation moment can be ensured to generate a capacitance value, and the induction influence of other capacitor pole pieces is avoided. The PCB detection board detects the capacitance value change process of each capacitance pole piece from bottom to top in sequence, when detecting that the capacitance value of the segmented electrode is in an obvious change process in sequence, the PCB detection board judges that the material is placed in the process, and when the capacitance value of the upper-level capacitance pole piece of a certain segmented electrode is unchanged, the control chip confirms that the current liquid level is at the water level position corresponding to the capacitance pole piece. When the capacitance value of the segmented electrode is detected to have no obvious change, the user is judged to be electrified after the material is placed, the change condition of the capacitance value difference between the segmented electrodes is detected, and when the capacitance value difference between certain two adjacent segmented electrodes has obvious change, the control chip judges that the current liquid level is at the position of the segmented electrode.
As in the PCB test board shown in figure 2, the control chip sets the time frequency t 0 Sequentially and circularly detecting the capacitance value of the first capacitance pole piece of each segment, and calculating the capacitance difference value between the electrodes of the control chip according to the capacitance value of each segment electrodeAnd confirming that the maximum position point of the capacitance difference value is the position of the current water level.
For example, at time points T1-n T 0 (n is the number of the first capacitor pole pieces) When the control chip detects that the L1 has obvious change, in the process that the detection time is continuously close to T1, the capacitance value difference between the segmented first capacitance pole piece L2 and the segmented first capacitance pole piece L1 is continuously increased, and the capacitance value difference of other segmented electrodes is basically in a non-change state. Therefore, the control chip confirms the capacitance value difference between the segment first capacitance pole piece L2 and the segment first capacitance pole piece L1And at maximum, the control chip confirms that the current water level is on the first capacitance pole piece L2.
For the existing non-contact (spaced) water level detection, the water level detection is basically carried out by adopting the capacitance value change of a single capacitance pole piece, and as the capacitance pole pieces are discontinuous, the temperature difference between the pole pieces is obvious, and the capacitance value of the capacitance pole pieces is greatly influenced by the slurry temperature and the environmental temperature, the misjudgment is easily caused, and the water level detection failure probability is increased. In the embodiment, the control chip dynamically tracks and detects the capacitance value difference between the two adjacent segmented first capacitance pole pieces, and determines that the largest capacitance value difference is the position of the current water level, so that the problem of erroneous judgment of the water level is effectively solved.
For the present embodiment, other detection methods for detecting the water level signal are also included, such as detecting the fluctuation of the capacitance value sensed by the single first capacitance pole piece. The control chip is used for detecting the capacitance value of each sectional first capacitance pole piece in a circulating mode in a set time, and at any moment, only one capacitance pole piece is electrified for detection, and other capacitance pole pieces are in a grounding state. When the fluctuation amount of the capacitance value sensed by a certain first capacitance pole piece is larger than the preset fluctuation amount threshold value of the control chip, the control chip judges that the water level reaches the pulping water level corresponding to the first capacitance pole piece, otherwise, each sectional capacitance pole piece is still circularly detected.
For the PCB detection board of this embodiment, the two detection methods of the water level signal are compatible, and when the current water level signal is obtained by any method, the control chip will feed back the signal to the main control device, and the main control device determines the corresponding pulping program according to the corresponding water level signal, so as to realize subsequent slurry production. Of course, for the above method, when one of the detection methods obtains the water level signal, the other detection method can also perform the re-detection, and through the dual water level signal detection, the detection of the water level signal can be realized more accurately, and the influence of the external parasitic capacitance is prevented. For example, when the control chip confirms that the current water level corresponds to the first capacitance pole piece L and the water level rechecks and detects, the control chip judges whether the current water level is the first capacitance pole piece L or not according to the fluctuation quantity of the capacitance value sensed by the single first capacitance pole piece, if yes, the control chip confirms that the detection is accurate, and when not, the control chip can carry out the cyclic detection again according to the capacitance difference value of two adjacent first capacitance pole pieces until the current water level signal is finally confirmed.
After the water level detection stage is finished, the slurry manufacturing process is carried out, and meanwhile, the PCB detection board also carries out overflow prevention signal detection in the overflow prevention detection stage in the slurry manufacturing process.
And (3) overflow prevention detection: for this embodiment, the anti-overflow detection area includes a plurality of second capacitor pole pieces, and the anti-overflow detection area is provided with a dividing groove along the diagonal line of the rectangle, and the dividing groove divides the anti-overflow detection area into two triangular sub-anti-overflow detection areas, and simultaneously, under the same liquid level height, the sensing areas corresponding to the two sub-anti-overflow detection areas are different.
As shown in fig. 2, the overflow preventing detection area is divided into a first sub-overflow preventing detection area tri1 and a second sub-overflow preventing detection area tri2 of a triangle shape of left and right columns by a dividing groove, the tip of tri1 is upward, the tip of tri2 is downward, and tri1 and tri2 are respectively configured as a plurality of segmented sub-pole pieces. Similarly, when detecting the anti-overflow signal at a certain time, the control chip uses the set time frequency t 0 Sequentially detecting capacitance values of all the sub-pole pieces in the triangular areas on the left side and the right side, and respectively accumulating the increment of the capacitance value sensed by each sub-pole piece of tri1 and tri2 to obtainAnd->The control chip calculates the ratio of the accumulated value of the increment of the capacitance values at the two sides, and the control chip is in accordance with the ratio +. >The current spill-proof signal height is determined.
Meanwhile, in the pulping process, the foam height of the surface of the slurry is uneven, and the conditions of higher partial area and lower partial area exist, so that the capacitance values sensed by all the sub pole pieces of tri1 and tri2 are jumped in the overflow prevention detection process, different liquid heating structures are different, and the PCB detection board is installed relative to the pulping container, and the ratio is different based on the differenceA corresponding correction, i.e. k= = -is needed>(eta is a correction coefficient, and liquid heaters with different structural forms have corresponding correction coefficients).
Meanwhile, the control chip is also preset with K 0 Wherein, the preset value K 0 When the height ratio of the anti-overflow detection areas at the left side and the right side is equal to or close to K 0 When the foam overflow prevention device is used, the control chip confirms the overflow prevention height reached by the current foam, and then feeds back an overflow prevention signal to the main control device, so that corresponding program operation, such as stopping of a motor or heating stop, is realized, and the safety risk of foam overflow can be effectively prevented. Of course, for the present embodiment, the control chip may also preset the total height H of the anti-overflow detection area, and in the anti-overflow detection process, the control chip calculates the increment ratio k=of the capacitance values of the first sub-anti-overflow detection area and the second sub-anti-overflow detection area Control coreThe sheet determines the current overflow prevention height according to the proportion of K to H. Of course, different liquid heaters have different correction factors +.>K=/>。
Because the existing non-contact (air-isolation) liquid level detection basically adopts the capacitance value change of a single electrode to carry out anti-overflow liquid level detection, a thick foam layer exists above the liquid level during pulping, foam in the foam layer can be prevented from contacting with the cup wall, so that a distance gap exists between the foam and the cup wall, the capacitance value sensed by the single electrode can be influenced, moreover, the surface of the foam layer is uneven, the foam in the central area of a pulping container is not as high as the foam in the cup wall, even, the foam in different positions of the cup wall is not the same, only a certain value can be sensed by the single electrode, and the certain value is not necessarily the current foam height. For example, when the middle layer of the foam has big bubbles, the foam of the lower layer of the foam and the foam of the upper layer of the foam can be sensed by a single electrode, but the single electrode can only sense a maximum capacitance value, based on the fact, the single electrode can not transmit the foam of the upper layer of the foam to the control chip, so that the control chip can not recognize the foam anti-overflow signal of the upper layer of the foam, and meanwhile, the capacitance value change sensed by the single electrode can be influenced by the temperature of the foam, the ambient temperature and the like, the anti-overflow position can not be accurately detected, and the problem of large detection deviation exists, so that the problems of anti-overflow failure and the slurry overflow are easily caused by the anti-overflow erroneous judgment in the pulping process. The inventor finds that by adopting a plurality of capacitor pole pieces to be arranged in a segmented way, each capacitor pole piece is utilized to respectively sense the capacitance value of each segment, and then the increment ratio of the capacitance values of the two triangles can be basically equivalent to the area ratio of the two triangles covered by slurry foam, according to the principle, the detected overflow prevention liquid level is more approximate to the set overflow prevention liquid level, so that the probability of slurry overflow can be greatly reduced, and the safety risk of overflow prevention is improved.
By adopting the anti-overflow detection method, the anti-overflow detection position detected by the PCB detection board is closer to the actual anti-overflow position, and the occurrence of overflow slurry can be effectively prevented. Of course, for the present embodiment, the single second capacitance pole piece is actually formed by the sub pole piece corresponding to the first sub anti-overflow detection area and the sub pole piece of the second anti-overflow detection area, so that the current anti-overflow detection position can be determined by accumulating the capacitance values sensed by the two sub pole pieces by using the capacitance values sensed by the two sub pole pieces, and then determining the current anti-overflow detection position by the control chip according to whether the capacitance value difference between the two adjacent second capacitance pole pieces is the largest. It should be noted that, for the two detection methods of the two anti-overflow signals, only one of the two detection methods can be selected, and the two detection methods cannot be applied to the detection of the anti-overflow signals at the same time, wherein for the embodiment, the comparison is performed by using the capacitance value accumulated values sensed by the left triangle and the right triangle to determine that the anti-overflow detection position is more accurate, and the detection method is closer to the actual anti-overflow position reached by the slurry, and the detection method is also a preferable scheme of the embodiment.
In addition, it should be further noted that in this embodiment, the dividing groove divides the overflow preventing detection area into triangles, so as to realize that the sensing areas of the two sub overflow preventing detection areas under the same liquid level are different, and different overflow preventing heights can be determined according to different ratios based on the difference of the sensing areas. Therefore, the dividing groove is not limited to dividing the overflow preventing area into two equal triangles, but may be a trapezoid dividing the overflow preventing area into two equal trapezoids. Similarly, the dividing groove is not limited to a straight dividing groove provided obliquely to the substrate, but may be a curved dividing groove, for example, dividing the overflow preventing detection area into tai chi patterns according to tai chi curves.
In the water level detection process, the control chip sequentially and circularly detects the capacitance values of all the first capacitance pole pieces in set time, and at any moment, only one first capacitance pole piece is electrified for detection, and the other first capacitance pole pieces are set for grounding treatment; or in the process of anti-overflow detection, the control chip sequentially and circularly detects the capacitance values of all the second capacitance pole pieces in set time, and at any moment, only one second capacitance pole piece is electrified for detection, and the other second capacitance pole pieces are set for grounding treatment. Therefore, the confusion phenomenon of capacitance detection and the influence of external parasitic capacitance on an actual detection signal can be effectively avoided.
It should be noted that, for the present embodiment, at least the mounting area where the PCB detecting board is mounted is generally required to be made of a non-conductive material, such as a pulping container surrounded by a glass or plastic cup, a pulping container formed by combining a glass with a heating plate, or a pulping container formed by combining a metal cup with a non-metal transparent window, and the PCB detecting board is mounted on the transparent window. In general, to avoid that the conductive pulping container will generate detection interference to the capacitor pole piece on the PCB detection board, the actually detected capacitance value change is affected. Also, in the present embodiment, the general water level detection area is configured to detect only the water level signal without detecting the overflow prevention signal, and the overflow prevention detection area is generally configured to detect only the overflow prevention signal without detecting the water level signal. Of course, for the present embodiment, the second capacitor plates at the lower part of the overflow prevention detection area may also be used to detect the water level signal, and the second capacitor plates at the upper part of the overflow prevention detection area are used to detect the overflow prevention signal, that is, the maximum pulping capacity of the pulping container is higher than the second capacitor plates at the lower part of the overflow prevention detection area, but the situation of the highest second capacitor plates is not exceeded, so as to realize the ultra-high water level pulping of the pulping container. Similarly, based on the same principle, the first capacitance pole pieces at the upper part of the water level detection area can also be used for the overflow prevention detection of the ultra-low water level, and the control chip can be realized only by performing corresponding programming.
The above structural changes and parameter selections of the present embodiment may be applied to other embodiments of the present invention.
Embodiment two: fig. 5 is a schematic structural diagram of a PCB inspection board according to a second embodiment of the present invention. The first difference between this embodiment and the second embodiment is that: in this embodiment, the PCB detection board has no dividing groove, each second capacitor pole piece 54b on the anti-overflow detection area 55b is a complete capacitor pole piece, and the water level detection area 55a in this embodiment is formed by equally spacing a plurality of first capacitor pole pieces 54a, and the anti-overflow detection area 55b is formed by equally spacing a plurality of second capacitor pole pieces 54 b. And, the detection height of the single second capacitive pole piece 54b is greater than the detection height of the single first capacitive pole piece 54 a.
For the present embodiment, the pulping process of the food processor also includes a water level detection stage and an overflow prevention detection stage. In the stage of water level detection, a control chip is still adopted to calculate the capacitance difference between the electrodes according to the capacitance values of the segmented electrodesThe maximum position point of the capacitance difference value is confirmed to be the position of the current water level, the main control device determines a corresponding pulping program according to the water level signal fed back by the control chip, namely, different water levels correspond to different pulping processes, different overflow prevention detection positions are realized for pulping at different water levels, the slurry drink is manufactured sufficiently and efficiently, and meanwhile, the safety of pulping is ensured by a plurality of different overflow prevention detection positions, so that slurry overflow is effectively prevented. Meanwhile, in the pulping process, in the overflow prevention detection stage, the control chip can determine the current overflow prevention detection position according to the maximum capacitance value difference value between two adjacent second capacitance pole pieces, and then perform corresponding program operation according to the relation between the current overflow prevention detection position and the overflow prevention detection position set by a program, so that on one hand, the detection of overflow prevention signals is ensured, and on the other hand, the safety risk of overflow prevention in the pulping process is ensured. The first embodiment is the same as the first embodiment, and since the detection height of the second capacitor pole piece is obviously greater than that of the first capacitor pole piece, the larger capacitance value can be sensed to slurry bubbles, foam and the like, so that more accurate detection of the overflow prevention signal is realized, and the occurrence of misjudgment or unrecognization of the overflow prevention signal is prevented, thereby causing safety risk.
It should be noted that, for the present embodiment, the water level detection stage and the anti-overflow detection stage may also determine the water level and/or the anti-overflow signal by using the control chip according to the capacitance value fluctuation amount of the single capacitance pole piece as required.
In addition, it should be noted that the liquid heater of the present invention is not limited to the food processor with the motor and the cup body integrated in the embodiment of the present invention, but may be a soymilk machine with an upper motor, a wall breaking machine with a separated cup body and a stand, and a food processor without hand washing, which can realize automatic slurry discharging and automatic cleaning. The liquid heater of the present invention can be applied to a heating appliance capable of performing a cooking operation, a rice paste making operation, etc., such as a health preserving kettle, a health preserving pot, etc.
It will be appreciated by persons skilled in the art that the present invention includes, but is not limited to, the accompanying drawings and what has been described in the foregoing detailed description. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (10)
1. The utility model provides a separate liquid heater that anti-overflow detected, includes slurrying container, installs in slurrying container outer wall and is used for detecting liquid level's PCB pick-up plate, its characterized in that: the PCB detection board is provided with a water level detection area and an overflow prevention detection area, the overflow prevention detection area is positioned above the water level detection area, the water level detection area is provided with a plurality of first capacitor pole pieces used for detecting water level signals, the overflow prevention detection area is provided with a plurality of second capacitor pole pieces used for detecting overflow prevention signals, the overflow prevention detection area comprises a first sub overflow prevention detection area and a second sub overflow prevention detection area which are divided into a side-by-side arrangement by dividing grooves, the dividing grooves are straight-line dividing grooves which are obliquely arranged relative to the PCB detection board, the single second capacitor pole piece is divided into two sub pole pieces which are respectively positioned in two columns of sub overflow prevention detection areas by the dividing grooves, the PCB detection board is also provided with a control chip which is respectively connected with the first capacitor pole pieces and each sub pole piece, at least under the same overflow prevention height below the top end of the first sub overflow prevention detection area is not equal to the induction area of the second sub overflow prevention detection area, wherein in the overflow prevention detection process of the PCB detection board is carried out by the control chip, the control chip obtains the increment of the capacitance value of each sub overflow prevention detection area of the first sub overflow prevention detection area respectively And the accumulated value of the capacitance increment detected by each sub-pole piece of the second sub-overflow prevention detection area +.>And according to->And->Is used to determine the current spill-proof height.
2. The liquid heater for space-saving spill-proof detection of claim 1, wherein: the control chip presets the height ratio K of the first sub-overflow prevention detection area and the second sub-overflow prevention detection area under the same overflow prevention height 0 In the process of the anti-overflow detection, the control chip calculates the increment ratio K of the capacitance values of the first sub-anti-overflow detection area and the second sub-anti-overflow detection area, and the control chip calculates the increment ratio K of the capacitance values of the first sub-anti-overflow detection area and the second sub-anti-overflow detection area according to the K and the K 0 Is used to determine the current spill-resistant height.
3. The liquid heater for space-saving spill-proof detection of claim 1, wherein: the control chip is pre-provided with the total height H of the anti-overflow detection area, in the anti-overflow detection process, the control chip calculates the increment ratio K of the capacitance values of the first sub-anti-overflow detection area and the second sub-anti-overflow detection area, and the control chip determines the current anti-overflow height according to the proportion of K to H.
4. A liquid heater for space-saving spill-proof detection according to claim 2 or 3, characterized in that: the areas of the first sub-overflow prevention detection area and the second sub-overflow prevention detection area are equal;
alternatively, the control chip corrects the calculated K value according to different liquid heaters, k= ，/>Is a correction coefficient.
5. The liquid heater for space-saving spill-proof detection of claim 1, wherein: a plurality of first capacitance pole pieces are positioned in the water level detection area from bottom to top according to L 1 To L n The marks are arranged at intervals, wherein in the water level detection, the capacitance difference value of two adjacent first capacitance pole pieces isWhen->When the water quantity is maximum, the control chip confirms that the current water quantity added into the pulping container is the first capacitance pole piece L n The corresponding water level, n, is the number of the first capacitance pole pieces.
6. The liquid heater for space-saving, spill-proof detection according to claim 1 or 5, wherein: when the control chip confirms that the current water level corresponds to the first capacitance pole piece L, the PCB detection board also has rechecking detection on the water level, and when the water level rechecking detection is carried out, the control chip judges whether the current water level is greater than a preset fluctuation threshold value or not according to the fluctuation quantity of the capacitance value sensed by the single first capacitance pole piece.
7. The liquid heater for space-saving spill-proof detection of claim 1, wherein: in the water level detection process, the control chip sequentially and circularly detects the capacitance value of each first capacitance pole piece in set time, and at any moment, only one first capacitance pole piece is electrified for detection, and the rest first capacitance pole pieces are set for grounding treatment;
Or in the process of anti-overflow detection, the control chip sequentially and circularly detects the capacitance values of all the second capacitance pole pieces in set time, and at any moment, only one second capacitance pole piece is electrified for detection, and the other second capacitance pole pieces are set for grounding treatment.
8. The liquid heater for space-saving spill-proof detection of claim 1, wherein: the overflow prevention detection positions corresponding to the different second capacitor pole pieces are different, and the pulping programs corresponding to the different overflow prevention detection positions are different.
9. The liquid heater for space-saving spill-proof detection of claim 1, wherein: the first capacitor pole pieces are equidistantly arranged in the water level detection area, and the detection height of a single first capacitor pole piece is h n =Wherein V is L For minimum pulping capacity of pulping vessel, V H The pulping container is of a cylindrical structure, r is the radius of the cylindrical pulping container, n is the number of the first capacitance pole pieces, and the distance between the adjacent first capacitance pole pieces is ∈>。
10. The liquid heater for space-saving spill-proof detection of claim 9, wherein: the second capacitor pole pieces are equidistantly arranged in the anti-overflow detection area, and the detection height of a single second capacitor pole piece is h N =The height from the lowest end of the water level detection area to the uppermost end of the overflow prevention detection area is H m N is an anti-overflow detection gear number corresponding to different pulping capacities, and the distance between every two adjacent second capacitor pole pieces is +.>Wherein->N is more than or equal to N, and N and N are integers。
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023114360660 | 2023-11-01 | ||
| CN202311436066 | 2023-11-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117782260A true CN117782260A (en) | 2024-03-29 |
Family
ID=90389513
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410210628.8A Pending CN117782260A (en) | 2023-11-01 | 2024-02-27 | Liquid heater for detecting overflow prevention in space |
| CN202410347205.0A Pending CN117941968A (en) | 2023-11-01 | 2024-03-26 | Pulping control method of liquid heater for air separation detection |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410347205.0A Pending CN117941968A (en) | 2023-11-01 | 2024-03-26 | Pulping control method of liquid heater for air separation detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN117782260A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6490920B1 (en) * | 1997-08-25 | 2002-12-10 | Millennium Sensors Ltd. | Compensated capacitive liquid level sensor |
| US20080231290A1 (en) * | 2004-05-14 | 2008-09-25 | Scientific Generics Ltd. | Capacitive Position Sensor |
| US20090153150A1 (en) * | 2007-12-05 | 2009-06-18 | Fluid Well Instruments B.V. | Measuring device and method for local measurement of at least one electrical property of the content of a container |
| CN201467926U (en) * | 2009-03-22 | 2010-05-19 | 励春亚 | Soybean milk machine with multistage water level detecting device |
| CN103354895A (en) * | 2012-02-09 | 2013-10-16 | 丰田自动车株式会社 | Liquid level detection device and fuel tank structure |
| CN105091979A (en) * | 2015-09-21 | 2015-11-25 | 中国石油大学(华东) | Method for conducting liquid level measuring through triangular capacitance-type sensor |
| JP2017032538A (en) * | 2015-07-30 | 2017-02-09 | 株式会社日本自動車部品総合研究所 | Liquid-amount detection device |
| CN107036676A (en) * | 2017-05-19 | 2017-08-11 | 中航工业南航（深圳）测控技术有限公司 | Fuel-quantity transducer, fuel quantity meas urement system and measuring method |
| CN207506472U (en) * | 2017-05-12 | 2018-06-19 | 九阳股份有限公司 | A kind of good food processor of anti-overflow effect |
| CN110411535A (en) * | 2019-08-27 | 2019-11-05 | 谢晔华 | A kind of capacitance type liquid level detection circuit and detection method |
| CN113108865A (en) * | 2021-04-06 | 2021-07-13 | 苏州理欧电子科技有限公司 | Wireless water level monitoring system |
| US20210293738A1 (en) * | 2018-07-13 | 2021-09-23 | Tecan Trading Ag | Devices and methods for capacitive foam detection in liquid containers |
-
2024
- 2024-02-27 CN CN202410210628.8A patent/CN117782260A/en active Pending
- 2024-03-26 CN CN202410347205.0A patent/CN117941968A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6490920B1 (en) * | 1997-08-25 | 2002-12-10 | Millennium Sensors Ltd. | Compensated capacitive liquid level sensor |
| US20080231290A1 (en) * | 2004-05-14 | 2008-09-25 | Scientific Generics Ltd. | Capacitive Position Sensor |
| US20090153150A1 (en) * | 2007-12-05 | 2009-06-18 | Fluid Well Instruments B.V. | Measuring device and method for local measurement of at least one electrical property of the content of a container |
| CN201467926U (en) * | 2009-03-22 | 2010-05-19 | 励春亚 | Soybean milk machine with multistage water level detecting device |
| CN103354895A (en) * | 2012-02-09 | 2013-10-16 | 丰田自动车株式会社 | Liquid level detection device and fuel tank structure |
| JP2017032538A (en) * | 2015-07-30 | 2017-02-09 | 株式会社日本自動車部品総合研究所 | Liquid-amount detection device |
| CN105091979A (en) * | 2015-09-21 | 2015-11-25 | 中国石油大学(华东) | Method for conducting liquid level measuring through triangular capacitance-type sensor |
| CN207506472U (en) * | 2017-05-12 | 2018-06-19 | 九阳股份有限公司 | A kind of good food processor of anti-overflow effect |
| CN107036676A (en) * | 2017-05-19 | 2017-08-11 | 中航工业南航（深圳）测控技术有限公司 | Fuel-quantity transducer, fuel quantity meas urement system and measuring method |
| US20210293738A1 (en) * | 2018-07-13 | 2021-09-23 | Tecan Trading Ag | Devices and methods for capacitive foam detection in liquid containers |
| CN110411535A (en) * | 2019-08-27 | 2019-11-05 | 谢晔华 | A kind of capacitance type liquid level detection circuit and detection method |
| CN113108865A (en) * | 2021-04-06 | 2021-07-13 | 苏州理欧电子科技有限公司 | Wireless water level monitoring system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117941968A (en) | 2024-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108309035A (en) | Electric cooking pot and its anti-spilled failure detector and anti-spilled fault detection method | |
| WO2013048544A1 (en) | Capacitance sensing circuits, methods and systems having conductive touch surface | |
| WO2017149049A1 (en) | Liquid container, beverage production system and method for detecting a liquid filling level of a container | |
| CN206350661U (en) | Electric cooking pot and the foam detecting device for it | |
| CN101561307A (en) | Electronic device for detecting and displaying liquid position and application method thereof | |
| CN205849315U (en) | Food processor and water level detection circuit thereof | |
| CN108309040A (en) | Electric cooking pot and its anti-spilled control device and anti-overflow discharge control method | |
| CN108324102A (en) | Electric cooking pot and its anti-spilled control device and anti-overflow discharge control method | |
| CN107874613A (en) | Electric cooking pot and its heating control system and control method | |
| CN202197760U (en) | Soybean milk machine capable of accurately detecting | |
| CN117782260A (en) | Liquid heater for detecting overflow prevention in space | |
| CN106264087A (en) | Anti-spilling structure and there is its cooking apparatus | |
| JP5045023B2 (en) | Input device | |
| US11571082B2 (en) | Pot cover assembly | |
| CN112080915B (en) | Water storage box water level detection system, water level detection method and clothes dryer of household appliance | |
| CN206350669U (en) | Electric cooking pot and the anti-spilled detection means for it | |
| CN206950058U (en) | Electric cooking pot and its anti-spilled display system | |
| CN108309038A (en) | Electric cooking pot and its anti-spilled control device and anti-overflow discharge control method | |
| CN107884032A (en) | Electric cooking pot and the anti-spilled detection means for it | |
| CN109425407B (en) | Liquid overflow detection method and device, pot, heating device and heating assembly | |
| CN108309045A (en) | The time computational methods of electric cooking pot and its anti-spilled detecting system and steam bubble | |
| CN108309037A (en) | Electric cooking pot and its anti-spilled detecting system and failure reminding method | |
| CN210719328U (en) | Water level detection circuit and cooking machine | |
| CN206350671U (en) | Anti-overflow detection means and cooking apparatus for cooking apparatus | |
| CN108309043A (en) | Electric cooking pot and its anti-spilled display system and anti-spilled display methods |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |