CN1952623A - Water level detecting method and apparatus for water tank of household appliances - Google Patents
Water level detecting method and apparatus for water tank of household appliances Download PDFInfo
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- CN1952623A CN1952623A CN 200510044943 CN200510044943A CN1952623A CN 1952623 A CN1952623 A CN 1952623A CN 200510044943 CN200510044943 CN 200510044943 CN 200510044943 A CN200510044943 A CN 200510044943A CN 1952623 A CN1952623 A CN 1952623A
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Abstract
The detection method of household electrical appliance water level of tank includes: 1) the light beam is irradiated into the water tank; 2) choosing a test point at the extending direction of the light beam; 3) whether is there water in water tank at the position of light beam passing by can be determined by whether the light beam is be received by the test point, so the high-low level of the water in tank can be known. The apparatus includes beam-forming arrangement, photosensor, control circuit and hint device. The certainty of measurement is improved greatly than past in the invention and accuracy of test result is easy to control for using the principle of anaclasis; the signal generated by the photosensor is in digit, so there is no need to precede the A/D conversion, the circuit structure can be simplified greatly; the photosensor will not contact the water, so the mechanic frame is simplified greatly relatively to the existing technique and easy to produce.
Description
Technical field
The present invention relates to household appliance technical field, specifically be meant the detection method of water tank of household appliances water level and the device that is adopted thereof.
Background technology
In the household electrical appliance such as micro-wave oven, electric iron, usually have the structure of water tank, be used to vapour system that steam is provided.In the prior art, the method for testing of water tank of household appliances water level is mainly contained two kinds of temperature sensing method and pressure-sensing methods.
The ultimate principle of temperature sensing method is because of not had water in the higher perception water tank of heter temperature by the temperature sensor induction, its circuit function module and workflow comprise: the temperature of the Steam Heating body of temperature element perception household electrical appliance, temperature signal is converted to electric signal sends analog signal processing circuit to, convert analog electrical signal to digital electric signal by the A/D change-over circuit then, and, indicate lack of water by finger device through MCU signals collecting and treatment circuit formation indicator signal.The shortcoming of this method is just to send indicator signal after the water tank lacks water of household electrical appliance, and can not indicate the water yield in the water tank in advance, has certain potential safety hazard.
The ultimate principle of pressure-sensing method is to obtain the water level in the water tank of household appliances by pressure sensor senses hydraulic pressure, this kind method mainly is to utilize law of connected vessels, hydraulic pressure is converted to air pressure, by pressure transducer perception air pressure size, by amplifying circuit the signal that pressure transducer obtains is amplified, be converted to digital signal by the A/D change-over circuit, form indicator signal through MCU signals collecting and treatment circuit then, indicate water level by finger device, this method causes the structure of water tank of household appliances and corresponding circuit structure comparatively complicated, is difficult for realizing.
As seen, there is weak point in the detection method of water tank of household appliances water level in the prior art.
Summary of the invention
The invention provides a kind of detection method of water tank of household appliances water level and the device that is adopted thereof, its fundamental purpose is to overcome the temperature sensing method that prior art adopts and the weak point of pressure-sensing method.
The present invention adopts following technical scheme:
The detection method of water tank of household appliances water level comprises: light beam irradiates is gone in the water tank; 2) on the bearing of trend of this light beam, select a test point; 3) whether have by this test point and receive this light beam and judge whether the position of this light beam process in the water tank has water, thereby learn the height of water level in the water tank.
The detection method of aforementioned water tank of household appliances water level has two kinds of specific implementations: first kind is to make light beam penetrate a sidewall of water tank of household appliances with an angle, this angle is an acute angle or obtuse angle, described test point is chosen in outside another sidewall of water tank of household appliances, in water tank, do not have under the situation of water, this test point is positioned on this light beam, when this test point does not receive light beam, can judge the height that water level in the water tank reaches this test point, this be because light beam in water tank water refraction taken place to depart from, thereby do not arrive test point;
Second kind is to make light beam penetrate a sidewall of water tank of household appliances with an angle, this angle is an acute angle or obtuse angle, described test point is chosen in outside another sidewall of water tank of household appliances, in water tank, have under the situation of water, this test point is positioned on the light path of this light beam through forming after the water refraction of water tank, when this test point receives light beam, can judge the height that water level in the water tank reaches this test point, this is because could arrive this test point after the water refraction of light beam in water tank.
Further, according to above-mentioned principle, can by from the differing heights position to many light beams of water tank internal radiation, and corresponding selection and each light beam are positioned at the test point of differing heights one to one, whether the height of testing each test point correspondence in the water tank has water, thereby learns the height of water level.
The device that detection method adopted of above-mentioned water tank of household appliances water level comprises: water tank, comprise two sidewalls that form an angle, and these two sidewalls are positioned on the vertical direction; Light beam forms device, is positioned at outside above-mentioned one of them sidewall, and the light beam of its formation penetrates water tank by this sidewall, and passes water tank by another sidewall; Light activated element is located at outside above-mentioned another sidewall, produces an electric signal when receiving above-mentioned light beam; Control circuit, also above-mentioned light activated element links to each other, and the electric signal that light activated element is produced carries out analyzing and processing, and produces a cue; Suggestion device links to each other with above-mentioned control circuit, and the cue of reception control circuit also plays back it.
In the said apparatus, this light beam forms device and comprises infrarede emitting diode and light collimator apparatus, the infrared light that infrarede emitting diode sends is injected in the water tank behind this light collimator apparatus collimation at a certain angle, described light activated element is a photistor, can produce an electric signal when light activated element receives the infrared ray that infrarede emitting diode sends.
In the said apparatus, the position of this light activated element can have two kinds: first kind of intersection point that is light beam forms device, light activated element and light beam and water tank two side is located along the same line, in this case, if light activated element perceives light beam, illustrate that the water level in the water tank does not arrive the height of this light activated element correspondence, if light activated element does not perceive light beam, illustrate that the water level in the water tank has arrived the height of this light activated element correspondence, taken place to depart from because of the refraction of the water of light beam in water tank;
Another kind is that light activated element is arranged on the light path of this light beam through forming after the water refraction of water tank, when light activated element perceives light beam, illustrate that the water tank middle water level has arrived the height of this light activated element correspondence, because it is the water refraction back arrival light activated element of light beam in water tank, opposite then water level does not arrive the height of this light activated element correspondence.
In the aforementioned means, described light beam formation device has a plurality of, and lays respectively at different height, and described light activated element correspondingly also has a plurality of, and reply lays respectively at different height mutually, can judge the height of water level thus more accurately.
By the above-mentioned description of this invention as can be known, compare with prior art, the present invention has following advantage: one, owing to utilized the principle of light refraction, measuring accuracy was than improved greatly in the past, and precision of test result is easier to control; Two, the signal that light activated element produces is a digital signal, need not carry out analog to digital conversion again, and its circuit structure is simplified greatly; Three, light activated element need not contact water body, and its physical construction is also simplified greatly with respect to prior art, is easy to produce.
Description of drawings
Fig. 1 is the synoptic diagram of the state of the embodiment of the invention one when the water tank middle water level is lower than test point;
Fig. 2 is the synoptic diagram of the state of the embodiment of the invention one when the water tank middle water level is higher than test point;
Fig. 3 is the synoptic diagram of the state of the embodiment of the invention two when the water tank middle water level is lower than test point;
Fig. 4 is the synoptic diagram of the state of the embodiment of the invention two when the water tank middle water level is higher than test point.
Specific embodiment
Specific embodiments of the invention one see figures.1.and.2, and this cistern water level pick-up unit comprises that mainly the water tank 1 of household electrical appliance, light beam form device 2, light activated element 3 and a PCB circuit board and a suggestion device.Water tank 1 comprises two sidewalls that form an angle 11,12, and these two sidewalls 11,12 are positioned on the vertical direction.Light beam forms device 2 and is positioned at outside above-mentioned one of them sidewall 11, and this light beam forms device 2 and comprises infrarede emitting diode 21 and light collimator apparatus 22, and the infrared light that infrarede emitting diode 21 sends forms an infrared beam 4 behind collimator apparatus 22.Light activated element 3 is a photistor, is located at outside above-mentioned another sidewall 12, and its place ahead is provided with a filtering apparatus 31, but the veiling glare in the infrared beam of filtering process, and light activated element 3 can produce an electric signal after receiving infrared beam 4.Be respectively equipped with printing opacity mouth 44,45 on above-mentioned two side 11,12, this printing opacity mouth 44,45 and infrarede emitting diode 21, light activated element 3 are located along the same line, and the sidewall 11 of this straight line and water tank 1 and out of plumb, an acute angle or obtuse angle.The PCB circuit board is located at the appropriate location of close water tank 1 in the household electrical appliance, control circuit on it is connected with infrarede emitting diode 21 and light activated element 3, can receive the signal that produces behind the infrared beam 4 to light activated element 3 analyzes and handles, and suggestion device is installed on the surface of household electrical appliance, can be a display device or a loudspeaker, be controlled by the control circuit of PCB circuit board.
With reference to Fig. 1, when the water surface in the water tank 1 10 is lower than light activated element 3, infrared beam 4 is through printing opacity mouth 44,45 arrive light activated element 3, this infrared beam 4 is by printing opacity mouth 44,45 are distinguished into three section 41,42,43, light activated element 3 generations this moment one electric signal, the control circuit of PCB circuit board is analyzed and is handled this electric signal, produce a cue, this cue can be auditory tone cues signal or image, the text prompt signal, suggestion device then plays back this cue, and people can learn that by this suggestion device the water level in the water tank 1 has been lower than the test point of light activated element 3 correspondences.
With reference to Fig. 2, when the water surface in the water tank 1 10 is higher than light activated element 3, infrared beam 4 is injected in the water of water tank 1 through printing opacity mouth 44, after the refraction of water, depart from, can't pass printing opacity mouth 45 and arrive light activated element 3, thereby light activated element 3 do not produce electric signal, the control circuit of PCB circuit board produces a cue in view of the above, play back by suggestion device, people can learn that the water surface 10 in the water tank 1 is higher than the test point of light activated element 3 correspondences.This infrared beam 4 is distinguished into two section 41,42 ' by printing opacity mouth 44.
Specific embodiments of the invention two, with reference to Fig. 3 and Fig. 4, be with the key distinction of embodiment one: two side 11, be respectively equipped with printing opacity mouth 44 on 12,45 ', this printing opacity mouth 44,45 ' with infrarede emitting diode 21, light activated element 3 is not to be located along the same line, if be divided into three section 41 that is broken line shape after the water refraction of infrared beam 4 in water tank 1,42 ', 43 ', and printing opacity mouth 44,45 ' is positioned at this three section 41 just, 42 ', on 43 ' the separation, promptly, have in water tank 1 under the situation of water, the infrared beam 4 through reflecting can pass through printing opacity mouth 45 ' just.Its leading portion 41 and sidewall 11 out of plumb are so that can produce refraction effect.And its light activated element 3 is located on the final stage 43 ' of infrared beam 4, but this infrared beam 4 of perception.
With reference to Fig. 3, when the water surface in the water tank 1 10 is lower than light activated element 3, infrared beam 4 is injected water tank 1 rear to not changing through printing opacity mouth 44, thereby can't arrive light activated element 3 by printing opacity mouth 45 ', this infrared beam 4 is distinguished into two section 41 by printing opacity mouth 44,42, this moment, light activated element 3 did not produce electric signal, the control circuit of PCB circuit board produces a cue, this cue can be auditory tone cues signal or image, the text prompt signal, suggestion device then plays back this cue, and people can learn that by this suggestion device the water level in the water tank 1 has been lower than the test point of light activated element 3 correspondences.
With reference to Fig. 4, when the water surface in the water tank 1 10 is higher than light activated element 3, infrared beam 4 is injected in the water of water tank 1 through printing opacity mouth 44, after the refraction of water, depart from, pass printing opacity mouth 45 ' and arrive light activated element 3, thereby light activated element 3 produces an electric signal, the control circuit of PCB circuit board is analyzed and is handled this electric signal, produce a cue, play back, make people learn that water level also is higher than the test point of light activated element 3 correspondences by suggestion device.This infrared beam 4 is distinguished into three section 41,42 ', 43 ' by printing opacity mouth 44,45 '.
In above-mentioned two embodiment, light beam formation device 2 and light activated element 3 are equipped with a plurality of, and correspondence is positioned at differing heights one by one, can judge the position of the water surface 10 in the water tank 1 thus more accurately.
Above-mentioned only is two specific embodiments of the present invention, but design concept of the present invention is not limited thereto, and allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection domain of the present invention.
Claims (9)
1, the detection method of water tank of household appliances water level comprises:
1) light beam irradiates is gone in the water tank;
2) on the bearing of trend of this light beam, select a test point;
3) whether have by this test point and receive this light beam and judge whether the position of this light beam process in the water tank has water, thereby learn the height of water level in the water tank.
2, the detection method of water tank of household appliances water level as claimed in claim 1, wherein, make light beam penetrate a sidewall of water tank of household appliances with an angle, this angle is an acute angle or obtuse angle, described test point is chosen in outside another sidewall of water tank of household appliances, does not have in water tank under the situation of water, and this test point is positioned on this light beam, when this test point does not receive light beam, can judge the height that water level in the water tank reaches this test point.
3, the detection method of water tank of household appliances water level as claimed in claim 1, wherein, make light beam penetrate a sidewall of water tank of household appliances with an angle, this angle is an acute angle or obtuse angle, described test point is chosen in outside another sidewall of water tank of household appliances, has in water tank under the situation of water, and this test point is positioned on the light path of this light beam through forming after the water refraction of water tank, when this test point receives light beam, can judge the height that water level in the water tank reaches this test point.
4, the detection method of water tank of household appliances water level as claimed in claim 1, further comprise, by from the differing heights position to many light beams of water tank internal radiation, and corresponding selection and each light beam are positioned at the test point of differing heights one to one, whether the height of testing each test point correspondence in the water tank has water, thereby learns the height of water level.
5, the device that detection method adopted of water tank of household appliances water level as claimed in claim 1 comprises: water tank, comprise two sidewalls that form an angle, and these two sidewalls are positioned on the vertical direction;
Light beam forms device, is positioned at outside above-mentioned one of them sidewall, and the light beam of its formation penetrates water tank by this sidewall, and passes water tank by another sidewall;
Light activated element is located at outside above-mentioned another sidewall, produces an electric signal when receiving above-mentioned light beam;
Control circuit, also above-mentioned light activated element links to each other, and the electric signal that light activated element is produced carries out analyzing and processing, and produces a cue;
Suggestion device links to each other with above-mentioned control circuit, and the cue of reception control circuit also plays back it.
6, device as claimed in claim 5, wherein, this light beam forms device and comprises infrarede emitting diode and light collimator apparatus, and the infrared light that infrarede emitting diode sends is injected in the water tank behind this light collimator apparatus collimation at a certain angle, and described light activated element is a photistor.
7, device as claimed in claim 5, wherein, the intersection point that described light beam forms device, light activated element and light beam and water tank two side is located along the same line.
8, device as claimed in claim 5, wherein, described light activated element is arranged on the light path of this light beam through forming after the water refraction of water tank.
9, device as claimed in claim 5, wherein, described light beam formation device has a plurality of, and lays respectively at different height, and described light activated element correspondingly also has a plurality of, and reply lays respectively at different height mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510044943 CN1952623A (en) | 2005-10-19 | 2005-10-19 | Water level detecting method and apparatus for water tank of household appliances |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510044943 CN1952623A (en) | 2005-10-19 | 2005-10-19 | Water level detecting method and apparatus for water tank of household appliances |
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| CN1952623A true CN1952623A (en) | 2007-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510044943 Pending CN1952623A (en) | 2005-10-19 | 2005-10-19 | Water level detecting method and apparatus for water tank of household appliances |
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| CN (1) | CN1952623A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063848A1 (en) * | 2011-10-31 | 2013-05-10 | 惠州市华阳医疗电子有限公司 | Negative-pressure wound therapy system for detecting exudate level through photoelectronic total internal reflection |
| CN112735099A (en) * | 2021-01-12 | 2021-04-30 | 深圳市四维科技有限公司 | Parking lot alarm method and security system |
-
2005
- 2005-10-19 CN CN 200510044943 patent/CN1952623A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063848A1 (en) * | 2011-10-31 | 2013-05-10 | 惠州市华阳医疗电子有限公司 | Negative-pressure wound therapy system for detecting exudate level through photoelectronic total internal reflection |
| US20140257209A1 (en) * | 2011-10-31 | 2014-09-11 | Foryou Medical Electronics Co., Ltd. | Negative-pressure wound therapy system for detecting exudate level through photoelectronic total internal reflection |
| EP2774632A4 (en) * | 2011-10-31 | 2015-07-01 | Foryou Medical Electronics Co Ltd | Negative-pressure wound therapy system for detecting exudate level through photoelectronic total internal reflection |
| US9895472B2 (en) * | 2011-10-31 | 2018-02-20 | Jiqi Jian | Negative-pressure wound therapy system for detecting exudate level through photoelectronic total internal reflection |
| CN112735099A (en) * | 2021-01-12 | 2021-04-30 | 深圳市四维科技有限公司 | Parking lot alarm method and security system |
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Open date: 20070425 |