CN101246031B - Food heating device with water level measuring device - Google Patents
Food heating device with water level measuring device Download PDFInfo
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- CN101246031B CN101246031B CN2007100375731A CN200710037573A CN101246031B CN 101246031 B CN101246031 B CN 101246031B CN 2007100375731 A CN2007100375731 A CN 2007100375731A CN 200710037573 A CN200710037573 A CN 200710037573A CN 101246031 B CN101246031 B CN 101246031B
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Abstract
The present invention discloses a water level measuring device and a heating processing device with the measuring device, the structure is simple and the microcontroller in the device can effectively control the processing state, and whether water exists in the sink and the height of the water level can also be directly displayed on the liquid crystal screen. The technical scheme is that the measuring device comprises the following components: a pair of electrodes which are symmetrically arranged at opposite two surfaces at the external wall of the sink; a water-depth calculating module which is connected to the pair of the electrodes for collecting the voltage signal and calculates the depth of the water in the sink; and an output interface which outputs the water depth calculated by the water-depth calculating module. The invention is applied in the microwave oven manufacturing field.
Description
Technical field
A kind of food heating device that the present invention relates to a kind of measurement mechanism of water level depth and have this device relates in particular to and a kind ofly utilizes the capacitive transducer principle that the tank water level is carried out non-cpntact measurement and can show the device of water level on liquid crystal display.
Background technology
Have in the food heating device of tank, the conventional method of observing water level at present is to illuminate tank by the LED that lights the tank rear side, utilizes watch window to observe the height that gauge on the tank obtains water level.This method directly relies on the height that human eye is observed water level.
A kind of method of Chu Xianing is to utilize infrared ray to measure the height of water level indirectly subsequently.There are following problems in two kinds of above-mentioned prior aries: (1) for first kind of method that relies on the human eye Direct observation, the microcontroller of food heating device can not detect water level depth automatically, thereby uncontrollable cooking state; (2) for the method for second kind of infrared detection, its apparatus structure complexity, cost is higher.
Summary of the invention
The food heating device that the object of the present invention is to provide a kind of water level measurement device and have this determinator, it is simple in structure, microcontroller in the device can effectively be controlled the cooking state, in the tank water have or not and water level height also can directly show on liquid crystal display.
Technical scheme of the present invention is: the invention provides a kind of water level measurement device, be arranged at outside the tank, it is characterized in that, this device comprises:
Pair of electrodes is symmetricly set in the relative two sides of this sink outer walls;
One depth of water computing module connects this to electrode, gathers voltage signal, calculates water level depth in this tank according to the value of this voltage signal;
One output interface is exported the water level depth that this depth of water computing module calculates.
Above-mentioned water level measurement device, wherein, this size shape to electrode is all identical.
Above-mentioned water level measurement device, wherein, this depth of water computing module further comprises:
Sensor connects this to electrode, gathers this to the voltage signal on the electrode;
Amplifying circuit connects this sensor, and this voltage signal is amplified;
Computing unit connects this amplifying circuit, and the voltage signal that receive to amplify calculates water level depth in this tank according to its signal value.
Above-mentioned water level measurement device, wherein, this determinator also comprises a display unit, connects this output interface, shows the water level depth that calculates.
Above-mentioned water level measurement device, wherein, this determinator also comprises:
One supporting seat is arranged at sink outer walls, with this corresponding part of electrode placement location is provided with the pair of metal shell fragment, and this contacts electrode with this metal clips, and this depth of water computing module is installed on this supporting seat by a PCB.
The present invention also provides a kind of food heating device that has water level measurement device, and wherein, this food heating device comprises:
One tank;
One cooking chamber;
Pair of electrodes is symmetricly set in the relative two sides of this sink outer walls;
One depth of water computing module connects this to electrode, gathers voltage signal, calculates water level depth in this tank according to the value of this voltage signal;
One output interface is exported the water level depth that this depth of water computing module calculates;
One display unit connects this output interface, shows the water level depth that calculates;
One condition setting unit is provided with the time and the temperature of cooking;
One water level judge module connects this output interface, and whether with water level depth and the setting value of output relatively, exporting also needs the control signal that continues to arrange;
One steam generation module connects this water level judge module, produces steam under the effect of this control signal;
One microwave generation module connects this water level judge module, produces microwave under the effect of this control signal;
One heating module connects this water level judge module, food heating food under the effect of this control signal.
Above-mentioned food heating device, wherein, this depth of water computing module further comprises:
Sensor connects this to electrode, gathers this to the voltage signal on the electrode;
Amplifying circuit connects this sensor, and this voltage signal is amplified;
Computing unit connects this amplifying circuit, and the voltage signal that receive to amplify calculates water level depth in this tank according to its signal value.
Above-mentioned food heating device, wherein, this arrangement device also comprises:
One supporting seat is arranged at sink outer walls, with this corresponding part of electrode placement location is provided with the pair of metal shell fragment, and this contacts electrode with this metal clips, and this depth of water computing module is installed on this supporting seat by a PCB.
Above-mentioned food heating device, wherein, this size shape to electrode is all identical.
The present invention contrasts prior art following beneficial effect: water level measurement device of the present invention adopts capacitive transducer outside tank water level to be carried out non-contact detecting, and is simple in structure; And obtain the tank water level, and then effectively control the cooking state by microcontroller; And the having that it's too late the water level height all can directly show on liquid crystal display of water in the tank.
Description of drawings
Fig. 1 is the structural representation of a preferred embodiment of water level measurement device of the present invention.
Fig. 2 is the synoptic diagram of clamping support of the present invention.
Fig. 3 is the part of module synoptic diagram of food heating device microcontroller of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 shows the structure of a preferred embodiment of water level measurement device of the present invention.See also Fig. 1, pair of electrodes 31,33 is placed on two relative sides of tank 21 outer walls.Preferably, the size shape of electrode is all identical, and the height of electrode generally approaches the height of tank, is greater than the degree of depth of peak level at least.Depth of water computing module 50 connects this to electrode 31,33, gathers voltage signal and calculates water level depth in the tank 21 according to the value of this voltage signal.Depth of water computing module 50 in the present embodiment comprises sensor 54, amplifying circuit 55, computing unit 56, and wherein computing unit 56 is arranged on microcontroller 57 inside.Final result of calculation is by output interface 58 outputs.Preferably, display unit 52 connects output interface 58, and the water level depth that calculates is presented on the lcd screen.
At first, microcontroller 57 transmits a signal and gives sensor 54, and command sensor 54 is by the voltage signal u on electrode pair 31,33 acquisition electrodes, then by amplifying circuit 55 voltage signal u is amplified and is transferred to microcontroller 57.Computing unit 56 in the microcontroller 57 is according to voltage signal u, and the correlation computations formula of utilization electric capacity calculates the water level depth h in the tank.
Concrete account form from voltage u to water level h is as follows:
Suppose that electrode height is H, water level depth is h, and then air height is (H-h), and according to capacitance equation
Wherein C is the electric capacity that two electrodes form, and unit is F, and A is the area of battery lead plate, and unit is m
2, D is the distance between two battery lead plates, unit is m; K is a relative dielectric constant, ε
0Being specific inductive capacity under the vacuum condition, is 8.85 * 10
-12F/m, wherein the relative dielectric constant of empty G﹠W is respectively 80,1.Principle according to the electric capacity parallel connection: C
Air+ C
Water=C
AlwaysDraw:
From above-mentioned account form as can be known, just can obtain water level value h from the voltage u that detects electric capacity the two poles of the earth.
The water level depth that computing unit calculates also can show by display unit 52 then by output interface 58 outputs.
See also Fig. 2, electrode 31,33 directly is fixed on the outer wall of tank 21, generally is arranged on two bigger opposite faces of area.Such as, if the shape of tank is vertical, then generally be fixed in two sides, if the shape of tank is flat horizontal, then generally be fixed in end face and bottom surface.Outer wall at tank 21 removably is provided with a supporting seat 34, the place that supporting seat 34 is corresponding with the electrode placement location is provided with pair of metal shell fragment 35,38, contact with electrode 31,33 respectively, the one side of supporting seat 34 also has a breach to stretch out the rising pipe 40 that connects in the tank.And above-mentioned water level computing module 50 is arranged on the PCB, and PCB is installed in supporting seat 34 tops.The benefit that supporting seat is installed is so that shirk tank, is used for adding water or changes water in tank.
In addition, the present invention also provides a kind of food heating device that has water level measurement device.Fig. 3 shows the functional structure of microcontroller in the food heating device of the present invention.The food heating device also has the above-mentioned pair of electrodes that water level measurement device comprised, designs depth of water computing module, output interface, display unit in microcontroller except having the module that common food heating devices such as tank, cooking chamber, the steam generation module 612, microwave generation module 611, heating module 613, condition setting module 614 of design microcontroller 601 in necessarily possess.Wherein depth of water calculation element has comprised sensor, amplifying circuit and computing unit.Other has a supporting seat removably to place sink outer walls, and is used with electrode pair.The concrete description of relevant this respect discloses in the foregoing description, does not therefore repeat them here.
For satisfying the needs of food heating device according to water level robotization cooking process, above-mentioned food heating device also has been equipped with a water level judge module 608 in addition, connect output interface, the water level depth and the setting value of output are compared, output control signals to steam generation module 612, microwave generation module 611 and heating module 613 according to comparative result.
Preparation operational phase at the food heating device, at first measure water level by water level measurement device, and by in the water level judge module 608 inspection tanks whether water (whether be equal to water level value is 0) and water level height being arranged, if anhydrous or water level is lower than setting value in the tank, with regard to process ends, otherwise entry condition setting module 614 is provided with the time and the temperature of cooking this time.Finish in the process of the cooking of going forward side by side in setting, just measure the tank water level and water level value is transferred to water level judge module 608 by water level measurement device every the cycle of setting (for example 5 seconds).When water level value during, show current water level depth and export one by display unit to control signal to steam generation module 612, microwave generation module 611, heating module 613 more than or equal to preset value.These three modules produce steam separately under the effect of control signal, produce microwave, food heating food.When water level value during, finish the flow process of cooking less than preset value.
The foregoing description provides to those of ordinary skills and realizes or use of the present invention; those of ordinary skills can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (4)
1. a food heating device that has water level measurement device is characterized in that, this food heating device comprises:
One tank;
One cooking chamber;
Pair of electrodes is symmetricly set in the relative two sides of this sink outer walls;
One depth of water computing module connects this to electrode, gathers voltage signal, calculates water level depth in this tank according to the value of this voltage signal;
One output interface is exported the water level depth that this depth of water computing module calculates;
One display unit connects this output interface, shows the water level depth that calculates;
One condition setting unit is provided with the time and the temperature of cooking;
One water level judge module connects this output interface, and whether with water level depth and the setting value of output relatively, exporting also needs the control signal that continues to arrange;
One steam generation module connects this water level judge module, produces steam under the effect of this control signal;
One microwave generation module connects this water level judge module, produces microwave under the effect of this control signal;
One heating module connects this water level judge module, food heating food under the effect of this control signal.
2. food heating device according to claim 1 is characterized in that, this depth of water computing module further comprises:
Sensor connects this to electrode, gathers this to the voltage signal on the electrode;
Amplifying circuit connects this sensor, and this voltage signal is amplified;
Computing unit connects this amplifying circuit, and the voltage signal that receive to amplify calculates water level depth in this tank according to its signal value.
3. food heating device according to claim 1 is characterized in that, this arrangement device also comprises:
One supporting seat is arranged at sink outer walls, with this corresponding part of electrode placement location is provided with the pair of metal shell fragment, and this contacts electrode with this metal clips, and this depth of water computing module is installed on this supporting seat by a PCB.
4. food heating device according to claim 1 is characterized in that, this size shape to electrode is all identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100375731A CN101246031B (en) | 2007-02-15 | 2007-02-15 | Food heating device with water level measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100375731A CN101246031B (en) | 2007-02-15 | 2007-02-15 | Food heating device with water level measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101246031A CN101246031A (en) | 2008-08-20 |
| CN101246031B true CN101246031B (en) | 2010-09-29 |
Family
ID=39946612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100375731A Expired - Fee Related CN101246031B (en) | 2007-02-15 | 2007-02-15 | Food heating device with water level measuring device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767853A (en) * | 2012-06-29 | 2012-11-07 | 美的集团有限公司 | Automatic descaling device of steam microwave oven and operation method thereof |
| CN102914291A (en) * | 2012-10-16 | 2013-02-06 | 大连理工大学 | Self-contained mooring posture monitoring device and method |
| CN103807885B (en) * | 2012-11-06 | 2017-03-08 | 广东美的厨房电器制造有限公司 | Steam microwave oven |
| CN104957974A (en) * | 2015-06-26 | 2015-10-07 | 宁波金凌厨房设备有限公司 | Interconnected and intercommunicated intelligent steam box |
| CN109099989A (en) * | 2018-07-26 | 2018-12-28 | 珠海格力电器股份有限公司 | Tank fill level detection device, method and water purifier |
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2007
- 2007-02-15 CN CN2007100375731A patent/CN101246031B/en not_active Expired - Fee Related
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| CN101246031A (en) | 2008-08-20 |
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Granted publication date: 20100929 Termination date: 20190215 |