CN109443491A - A kind of liquid level detection system, electric steam box and liquid-level detecting method - Google Patents
A kind of liquid level detection system, electric steam box and liquid-level detecting method Download PDFInfo
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- CN109443491A CN109443491A CN201811410298.8A CN201811410298A CN109443491A CN 109443491 A CN109443491 A CN 109443491A CN 201811410298 A CN201811410298 A CN 201811410298A CN 109443491 A CN109443491 A CN 109443491A
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- liquid level
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- liquid
- substrate
- detection signal
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- 239000007788 liquid Substances 0.000 title claims abstract description 173
- 238000001514 detection method Methods 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 68
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 239000011889 copper foil Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 5
- 206010014357 Electric shock Diseases 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004851 dishwashing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The present invention provides a kind of liquid level detection system, electric steam box and liquid-level detecting methods, the liquid level detection system includes substrate, sender unit and signal receiver, the substrate is suitable for being arranged on the lateral wall for the container for being contained with liquid, the sender unit and signal receiver are set to the side towards container of substrate, the sender unit can send first detection signal, the signal receiver can receive the second detection signal that the first detection signal is transmitted to signal receiver by liquid, which is used to provide foundation for the liquid level for judging liquid.By applying the present invention, solve existing liquid level detection device directly pastes capacitance detector on the wall, the defect of liquid level variation can not be accurately detected.
Description
Technical field
The present invention relates to detection device technical fields, and in particular to a kind of liquid level detection system, electric steam box and level sensing
Method.
Background technique
Liquid level variation usually can occur with using for liquid in a reservoir, such as in household living electric apparatus, can usually relate to
And supply water to using water tank for cooking apparatus etc., so that cooking apparatus is provided vapor food in time and steamed, if making
It is inadequate with water volume in water tank in the process, then it is likely to the food overdrying for causing to steam out, influences mouthfeel, or even water tank can be damaged.
The device of existing detection Water in Water Tanks amount is usually the variation for passing through the direct induction level of capacitor, is obtained with this
The variation of Water in Water Tanks position still when liquid level variation is small, just can not accurately detect liquid in such a way that capacitor directly incudes
Position variation.
Summary of the invention
Therefore, technical problems to be solved of the embodiment of the present invention are to overcome liquid level detection device in the prior art can not
It is accurately detected the defect of liquid level variation, to provide a kind of liquid level detection system, electric steam box and liquid-level detecting method.
According in a first aspect, the embodiment of the invention provides a kind of liquid level detection systems, comprising: substrate, sender unit
And signal receiver；The substrate, suitable for being arranged on the lateral wall for being contained with the container of liquid；The sender unit, if
In the first side of the substrate, for sending first detection signal；Wherein, first side is the substrate towards the appearance
The side of device；The signal receiver, set on the first side of the substrate, for receiving the second detection signal；Wherein, described
Two detection signals are the signal that the first detection signal is transmitted to the signal receiver by the liquid, for being judgement
The liquid level of the liquid provides foundation.
Liquid level detection system through the embodiment of the present invention, firstly, the substrate is set on the lateral wall of container, it will not be with liquid
Body directly contacts, and avoids electric shock risk；Secondly, sender unit sends first detection signal, which passes through liquid
Body transmission, signal receiver can receive the second detection signal, using mutual capacitance induction technology principle, pass through the second detection signal
It can know the capacitor between first detection signal and the second detection signal, accordingly even when small variation has occurred in liquid level, the
When one detection signal is transmitted by liquid, larger change can also occur for the received second detection signal of signal receiver, to reach
To the purpose of the capacitor between accurate detection sender unit and signal receiver, so as to adequately judge that liquid level provides
Foundation solves existing liquid level detection device and directly pastes capacitance detector on the wall, can not be accurately detected liquid
The defect of position variation.
With reference to first aspect, in first aspect first embodiment, the first detection signal is voltage signal, described
Second detection signal is quantity of electric charge signal.
With reference to first aspect, in first aspect second embodiment, the sender unit includes two, described in two
Sender unit is separately positioned on the two sides of the signal receiver.
With reference to first aspect, in first aspect third embodiment, the signal receiver includes that two subsignals connect
Device is received, two subsignal receivers are set side by side on the substrate.
With reference to first aspect, in the 4th embodiment of first aspect, the signal receiver includes that several subsignals connect
Receive device；Successively arrangement is set on the substrate several subsignal receivers in two separate ranks, the two column subsignal receivers
It is successively staggered, so that the liquid level intersects at least two subsignal receivers in the horizontal direction.
4th embodiment with reference to first aspect, in the 5th embodiment of first aspect, the subsignal receiver is
Copper foil.
5th embodiment with reference to first aspect, in first aspect sixth embodiment, the subsignal receiver
Shape includes: triangle, diamond shape, W-shaped.
With reference to first aspect or first aspect any embodiment, in the 7th embodiment of first aspect, the signal
Transmitter is copper foil.
7th embodiment with reference to first aspect, in the 8th embodiment of first aspect, the shape of the sender unit
Shape is rectangle.
With reference to first aspect, in the 9th embodiment of first aspect, the liquid level detection system further include: chip, institute
Chip is stated, is set on the substrate, is connect with the sender unit and the signal receiver, for sending first inspection
Signal is surveyed to the sender unit, and receives the second detection signal, and according to the first detection signal and described the
Two detection signals obtain the liquid level information in the container.
9th embodiment with reference to first aspect, in the tenth embodiment of first aspect, the chip is arranged described
Second side of substrate, described second side are the side far from the container of the substrate.
9th or the tenth embodiment with reference to first aspect, in the 11st embodiment of first aspect, further includes: weldering
Disk is connect with the chip, second side of the substrate is arranged in, for connecting power supply.
According to second aspect, the embodiment of the invention provides a kind of electric steam boxs, comprising: first aspect or first aspect are any
Liquid level detection system described in embodiment and the water tank for being provided with the liquid level detection system；The signal receiver and described
The bottom of sender unit is concordant with the bottom of the water tank respectively, and top is respectively higher than the maximum stage of the water tank.
In conjunction with second aspect, in second aspect first embodiment, the water tank further includes shield, is arranged described
On the side wall of water tank, the space of an accommodating liquid level detection system is formed with the side wall of the water tank.
In conjunction with second aspect or second aspect first embodiment, in second aspect second embodiment, the water tank
Further include: elastomeric connector, pinboard and adapter cable, the elastomeric connector are mounted on the pinboard, are suitable for and institute
State the pad electrical connection of liquid level detection system；The pinboard is electric conductor, is fixed on the casing of the water tank；Described turn
Conducting wire is connect, is arranged on the pinboard, for connecting power supply.
In conjunction with second aspect, in second aspect third embodiment, the electricity steam box further include: display panel, with institute
Chip (4) electrical connection for stating liquid level detection system, for showing the liquid level information.
According to the third aspect, the embodiment of the invention provides a kind of liquid-level detecting methods, comprising: sends first detection signal
To sender unit；Wherein, the sender unit is set to the first side of substrate, for sending first detection signal, the base
Plate is suitable for being arranged on the lateral wall for the container for being contained with liquid, and first side is the substrate towards the one of the container
Side；The second detection signal is received from signal receiver, the second detection signal is that the first detection signal passes through the liquid
Body is transmitted to the signal of the signal receiver；Wherein, the signal receiver is set to the first side of the substrate；According to described
First detection signal and the second detection signal obtain the liquid level information in the container.
It is described according to the first detection signal and described in third aspect first embodiment in conjunction with the third aspect
Second detection signal the step of obtaining the liquid level information in the container, comprising: according to the first detection signal and described the
Two detection signal acquisition capacitances；The liquid level information is obtained according to the capacitance.
In conjunction with the third aspect or third aspect first embodiment, the liquid-level detecting method further include: according to the liquid
Position acquisition of information water amount information；Judge whether the water amount information is less than preset value；When the water amount information is less than described preset
When value, warning message is prompted.
Technical solution of the embodiment of the present invention, has the advantages that
1. the embodiment of the invention provides a kind of liquid level detection system, including substrate, sender unit and signal receiver,
The substrate is suitable for being arranged on the lateral wall for the container for being contained with liquid, and the sender unit and signal receiver are set to substrate
Towards the side of container, which can send first detection signal, which can receive first inspection
The second detection signal that signal is transmitted to signal receiver by liquid is surveyed, which is used to be the liquid for judging liquid
Position provides foundation.Liquid level detection system through the embodiment of the present invention, firstly, the substrate is set on the lateral wall of container, it will not
It is directly contacted with liquid, avoids electric shock risk；Secondly, sender unit sends first detection signal, first detection signal warp
Liquid transmission is crossed, signal receiver can receive the second detection signal, using mutual capacitance induction technology principle, second detect by this
Signal can know the capacitor between first detection signal and the second detection signal, accordingly even when small change has occurred in liquid level
To change, when first detection signal is transmitted by liquid, larger change can also occur for the received second detection signal of signal receiver, from
And achieve the purpose that accurately to detect the capacitor between sender unit and signal receiver, so as to adequately judge liquid level
Foundation is provided, existing liquid level detection device is solved and directly pastes capacitance detector on the wall, can not accurately detect
The defect changed to liquid level.
2. signal receiver includes that several subsignals receive the embodiment of the invention provides a kind of liquid level detection system
Device, successively arrangement is set on substrate several subsignal receivers in two separate ranks, and two column subsignal receivers are successively staggered, with
Intersect liquid level at least two subsignal receivers in the horizontal direction.Several subsignal receivers are successively staggered, liquid
Position can intersect in the horizontal direction at least two subsignal receivers, when sender unit sends voltage signal, each
The different quantities of electric charge can be received on subsignal receiver, the summation of the quantity of electric charge on all subsignal receivers is to detect
Total charge dosage, the capacitor detected is then calculated according to the total charge dosage, because of each subsignal receiver and liquid
Contact area it is different, the small change of liquid level can also cause the variation of the detection capacitor of subsignal receiver, so that detection electricity
The precision of appearance is compared to the existing mode that a capacitance detector is arranged directly on container side wall, and detection accuracy is high, and energy
It is enough to provide accurate foundation to obtain liquid level change information.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a schematic diagram of liquid level detection system according to an embodiment of the present invention；
Fig. 2 is another schematic diagram of liquid level detection system according to an embodiment of the present invention；
Fig. 3 a is the schematic diagram of liquid level detection system according to the preferred embodiment of the invention；
Fig. 3 b is the side view of the corresponding liquid level detection system of Fig. 2；
Fig. 4 is the schematic diagram of the water tank according to an embodiment of the present invention for being provided with liquid level detection system；
Fig. 5 is the side view of the water tank according to an embodiment of the present invention for being provided with liquid level detection system；
Fig. 6 is the work flow diagram of liquid level detection system according to an embodiment of the present invention；
Appended drawing reference: 1- substrate, the first side 11-, 12- second side；2- sender unit；3- signal receiver, 31- letter
Number receiver；4- chip；5- pad；6- water tank, 61- shield, 62- elastomeric connector, 63- pinboard, 64- switching guiding,
65- casing.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
The embodiment of the invention provides a kind of liquid level detection systems, are applied to detection steam box, water dispenser, dish-washing machine etc. and need
The electric appliance of water level detecting, as shown in Figure 1, the liquid level detection system includes substrate 1, sender unit 2 and signal receiver 3,
In the substrate 1 be suitable for be arranged on the lateral wall for the container for being contained with liquid, be provided on the first side of the substrate 1 signal transmission
Device 2 and signal receiver 3, the first side of the substrate 1 are the side towards container of substrate 1, and the sender unit 2 is for sending
First detection signal in embodiments of the present invention, should in order to more completely detect the variation of the liquid level information in container
The length value of the short transverse of signal receiver 3 is greater than or equal to the maximum level of container, and the signal receiver 3 is for receiving the
Two detection signals, wherein the second detection signal is the signal that first detection signal is transmitted to signal receiver 3 by liquid, energy
Enough to judge that the liquid level of liquid provides foundation.Liquid level detection system through the embodiment of the present invention holds firstly, the substrate 1 is set to
It on the lateral wall of device, will not directly be contacted with liquid, avoid electric shock risk；Secondly, sender unit 2 sends the first detection letter
Number, which transmits by liquid, and signal receiver 3 can receive the second detection signal, incudes skill using mutual capacitance
Art principle can know the capacitor between first detection signal and the second detection signal by the second detection signal, so i.e.
Make liquid level that small variation have occurred, when first detection signal is transmitted by liquid, the detection letter of signal receiver 3 received second
Number larger change can also occur, thus achieve the purpose that accurately to detect the capacitor between sender unit 2 and signal receiver 3,
So as to adequately judge that liquid level provides foundation, solves existing liquid level detection device and directly paste electricity on the wall
Hold detector, the defect of liquid level variation can not be accurately detected.
Specifically, the first detection signal in above-mentioned specific embodiment is voltage signal, and the second detection signal is charge
Signal is measured, i.e., the sender unit 2 in the embodiment of the present invention sends voltage signal, which is transmitted to signal by liquid
Receiver 3 can receive charge on signal receiver 3, and the quantity of electric charge signal on the signal receiver 3 is above-mentioned second detection letter
Number, according to technology well known in the art, the received charge on receiving electrode, the mutual electricity between receiving electrode and sender electrode
Rongcheng direct ratio, i.e. Q=UC, Q indicate that the quantity of electric charge received on signal receiver 3, U indicate the voltage that sender unit 2 provides,
C indicates the capacitor between sender unit 2 and signal receiver 3, according to the principle, you can learn that the electricity of the liquid detected
Hold.
Then, according to the known calculation formula in this field: C=Er × Eo × A/d connects liquid is calculated with signal
The contact area A for receiving device 3, in the formula, Er indicates that the relative dielectric constant of chamber wall, Eo indicate the dielectric constant of air, A
Indicate the contact area of liquid and signal receiver 3, d indicates the thickness of chamber wall.According to above-mentioned formula be calculated liquid with
After the receiving area A of signal receiver 3, further according to area A, the liquid level h of liquid is calculated according to A=b × h, wherein b table
Show that the width of the chamber wall, h indicate the liquid level for the liquid being calculated.
In a preferred embodiment, the liquid level detection system of the embodiment of the present invention includes two sender units 2, this
Two sender units 2 are separately positioned on the two sides of signal receiver 3, and two sender units 2 can be used as one at
Type, it is also possible to separated, if separated, then two sender units 2 need to be connected with conducting wire, and two signals are sent
The purpose that device 2 is separately positioned on the two sides of signal receiver 3 is, so that the right and left of signal receiver 3 uniformly receives first
Signal is detected, so that the capacitance of detection is more accurate.
Specifically, the signal receiver 3 of the embodiment of the present invention includes two sub- signal receivers 31, the two subsignals connect
It receives device 31 to be set side by side on substrate 1, i.e., as shown in Fig. 2, setting gradually sender unit 2, two from left to right on substrate 1
Subsignal receiver 31 and sender unit 2, horizontal line where such liquid level can simultaneously with two sub- signal receivers 31
Intersection, two sub- signal receivers 31 receive the second detection signal simultaneously, according to the two received electricity of subsignal receiver 31
Lotus total amount calculates capacitor, signal receiver 3 due to a sub- signal receiver 31 less than a monolith, and subsignal receives
When the ratio for the entire area that the contact area of device 31 and liquid accounts for the subsignal receiver 31 is bigger, small area change is
Can cause the relatively big difference of its measured value, therefore precision of its detection is higher, it follows that by two sub- signal receivers 31
It receives signal receiver 3 detection of the detection signal compared to a monolith and receives signal, the capacitance accuracy of acquisition is high, measurement result
It is more acurrate.
In order to improve the precision of detection capacitor, in a preferred embodiment, the level sensing system of the embodiment of the present invention
The signal receiver 3 of system includes several subsignal receivers 31, and as shown in Figure 3a and Figure 3b shows, which includes seven
Subsignal receiver 31, successively arrangement is set on substrate this seven sub- signal receivers 31 in two separate ranks, and two column subsignals receive
Device 31 is successively staggered, so that liquid level intersects at least two subsignal receivers 31 in the horizontal direction.Of the invention real
It applies in example, sender unit 2 and signal receiver 3 are all copper foil, are pasted on substrate 1, and as shown in Figure 3a, which receives
Device 31 is the copper foil of triangle, is successively staggered, and liquid level can intersect in the horizontal direction with two sub- signal receivers 31,
When sender unit 2 sends voltage signal, the different quantities of electric charge, all sub- letters can be received on each subsignal receiver 31
The summation of the quantity of electric charge on number receiver 31 is the total charge dosage detected, and detection then is calculated according to the total charge dosage
The capacitor arrived.Because each subsignal receiver 31 is different from the contact area of liquid, the small change of liquid level can also cause son
The variation of the detection capacitor of signal receiver 31, so that the precision of detection capacitor is directly set on container side wall compared to existing
The mode of a capacitance detector is set, detection accuracy is high, and can provide accurate foundation to obtain liquid level change information.This hair
The sender unit 2 of bright embodiment is rectangular copper foil, the total height of the signal receiver 3 and the height of sender unit 2
It is greater than the highest liquid level line (A HIGH) of container and the difference of minimum liquid level line (A LOW) respectively.It should be noted that of the invention
The copper foil shape of the signal receiver 3 of embodiment is not limited to triangle, is also possible to the shapes such as diamond shape, W-shaped, the embodiment of the present invention
It is not limited system.
In a specific embodiment, as shown in Figure 3a and Figure 3b shows, the liquid level detection system of the embodiment of the present invention also wraps
Chip 4 is included, which is set to second side of substrate 1, which is the side of the separate container of substrate 1, sender unit 2
It is connect respectively by conducting wire with the chip 4 with signal receiver 3, the chip 4 transmission voltage detection signal to sender unit 2,
And quantity of electric charge signal is received from signal receiver 3, it can be on the chip 4 directly according to the voltage signal and quantity of electric charge signal meter
Capacitor is calculated, quantity of electric charge signal can also be transmitted to the controller of external container by the chip 4, calculated by controller.
In a specific embodiment, as shown in Figure 3a and Figure 3b shows, the liquid level detection system of the embodiment of the present invention also wraps
Pad 5 is included, which is arranged in second side of substrate 1, connect with chip 4, which can be realized connect with external power supply,
It is embodied as entire liquid level detection system power supply, and is also possible that the liquid level detection system of the embodiment of the present invention can need
It is powered when detecting liquid level, does not need power-off when detection liquid level.
The embodiment of the invention also provides the specific workflows of a liquid level detection system, for detecting the water of water tank
Amount, as shown in fig. 6, the workflow are as follows: controller initialization, when water volume in water tank changes, seven sub- signal receivers 31 are detected
Capacitance change, for controller, whole signal receiving sensor 3 is resolved into 100 equally spaced water
Bit line, the corresponding capacitance of each water level line is different, is calculating total capacitance, is deriving the position of water level line, then
The percentage for calculating water, is shown on control panel, and display panel shows water value, and warning message is prompted if water shortage.
The liquid level detection system of the embodiment of the present invention, firstly, the substrate 1 is set on the lateral wall of container, it will not be with liquid
It directly contacts, avoids electric shock risk；Secondly, sender unit 2 sends first detection signal, which passes through liquid
Transmission, signal receiver 3 can receive the second detection signal, using mutual capacitance induction technology principle, pass through the second detection signal
It can know the capacitor between first detection signal and the second detection signal, accordingly even when small variation has occurred in liquid level, the
When one detection signal is transmitted by liquid, signal receiver 3 received second, which detects signal, can also occur larger change, to reach
To the purpose of the capacitor between accurate detection sender unit 2 and signal receiver 3, so as to adequately judge that liquid level mentions
For foundation, solves existing liquid level detection device and directly paste capacitance detector on the wall, can not be accurately detected
The defect of liquid level variation.
The embodiment of the invention also provides a kind of electric steam box, it is provided on 6 lateral wall of water tank of the electricity steam box above-mentioned specific
Liquid level detection system in embodiment, the display panel of the electricity steam box are electrically connected with the chip 4 of liquid level detection system, Neng Gouxian
Show liquid level information.As shown in figure 4, the first side of the substrate 1 (pcb board) of the liquid level detection system, the i.e. pcb board are provided with signal
Transmitter 2 and signal receiver 3 are adhesive on one side on the lateral wall of water tank 6, and the side wall of the water tank 6 is flat surface, can be with
With 3M glue, it is also possible to other glue, viscose glue thickness≤1mm, the bottom point of the signal receiver 3 and sender unit 2
Not concordant with the bottom of water tank 6, top is respectively higher than the maximum stage of water tank 6, specifically, as shown in figure 4, A LOW is the water
The lowest water level line of position detecting system, A HIGH are the maximum water level of the water level detecting system, this depends on water level detecting system
The stickup relative position of system and water tank 6；It needs to adjust A, A LOW, A according to water level conditions to be detected in practical application example
The size of HIGH and position, to reach optimal detection range；The peripheral region of signal receiver 3 and sender unit 2 ground connection,
External interference is reduced, influence of the variation to detection accuracy of external environment is reduced, improves detection accuracy and reliability.Specifically,
Signal receive copper foil and signal send copper foil, protective ground wire, other copper foil cablings respectively between spacing be 0.3mm-
1.5mm, preferably, the spacing is the 1/2 of the pcb board thickness, the spacing is 0.8mm in embodiments of the present invention.
In order to protect the liquid level detection system, the water tank 6 of the embodiment of the present invention further includes shield 61, which sets
It sets on the side wall of water tank 6, forms the space for accommodating the liquid level detection system with the side wall of the water tank 6, as shown in figure 5,
Other than pad 5, other structures are covered by the shield 61 liquid level detection system, to reach the mesh of water proof and dust proof
's.
In a preferred embodiment, it as shown in figure 5, the water tank 6 further includes elastomeric connector 62 and pinboard 63, is somebody's turn to do
Elastomeric connector 62 is mounted on pinboard 63, which is electric conductor, is fixed on the casing 65 of water tank 6, in casing
When 65 fixed water tank 6, the elastomeric connector 62 is squeezed, which is in compressive state, so that elastic connection
Device 62 is electrically connected with the pad 5 of water level detecting system, is provided with adapter cable 64 on the pinboard 63, which can be with
Power supply or master control borad outside connection.Electricity directly can certainly be realized with external power supply or master control borad by the pad 5
It is connected and communicate with or elastomeric connector 62 is directly connect by needle stand or other structures with adapter cable 64, the present invention is real
It applies example and is not limited system.
The embodiment of the invention also provides a kind of liquid-level detecting method, which includes: to send the first detection
Signal receives the second detection signal from signal receiver 3, which is first detection signal to sender unit 2
The signal of signal receiver 3 is transmitted to by liquid；The liquid in container is obtained according to first detection signal and the second detection signal
Position information specifically according to first detection signal and the second detection signal acquisition capacitance, obtains liquid level letter according to the capacitance
Breath, wherein the sender unit 2 is set to the first side of substrate 1, and for sending and receiving first detection signal, substrate 1 is suitable for setting
It sets on the lateral wall for the container for being contained with liquid, which is the side towards container of substrate, and signal receiver 3 is set to
First side of substrate, short transverse are greater than or equal to the maximum level of container.Water amount information, judgement are obtained according to the liquid level information
Whether the water amount information is less than preset value, when the water amount information is less than preset value, prompts warning message.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (19)
1. a kind of liquid level detection system characterized by comprising substrate (1), sender unit (2) and signal receiver (3)；
The substrate (1), suitable for being arranged on the lateral wall for being contained with the container of liquid；
The sender unit (2) is set to first side (11) of the substrate (1), for sending first detection signal；Wherein,
First side (11) is the side towards the container of the substrate (1)；
The signal receiver (3) is set to first side (11) of the substrate (1), for receiving the second detection signal；Wherein,
The second detection signal is the signal that the first detection signal is transmitted to the signal receiver (3) by the liquid,
For to judge that the liquid level of the liquid provides foundation.
2. liquid level detection system according to claim 1, which is characterized in that the first detection signal is voltage signal,
The second detection signal is quantity of electric charge signal.
3. liquid level detection system according to claim 1, which is characterized in that the sender unit (2) is including two, two
A sender unit (2) is separately positioned on the two sides of the signal receiver (3).
4. liquid level detection system according to claim 1, which is characterized in that the signal receiver (3) includes two sons
Signal receiver (31), two subsignal receivers (31) are disposed in parallel on the substrate (1).
5. liquid level detection system according to claim 1, which is characterized in that the signal receiver (3) includes several sons
Signal receiver (31)；
Successively arrangement is set on the substrate (1) several subsignal receivers (31) in two separate ranks, the two column subsignals
Receiver (31) is successively staggered so that the liquid level in the horizontal direction at least two subsignal receivers (31)
Intersection.
6. liquid level detection system according to claim 5, which is characterized in that the subsignal receiver (31) is copper foil.
7. liquid level detection system according to claim 6, which is characterized in that the shape packet of the subsignal receiver (31)
It includes: triangle, diamond shape, W-shaped.
8. liquid level detection system according to claim 1-7, which is characterized in that the sender unit (2) is
Copper foil.
9. liquid level detection system according to claim 8, which is characterized in that the shape of the sender unit (2) is length
It is rectangular.
10. liquid level detection system according to claim 1, which is characterized in that further include: chip (4),
The chip (4) is set on the substrate (1), connect with the sender unit (2) and the signal receiver (3),
Signal is detected for sending the first detection signal to the sender unit (2), and reception described second, and according to described
First detection signal and the second detection signal obtain the liquid level information in the container.
11. liquid level detection system according to claim 10, which is characterized in that the chip (4) is arranged in the substrate
(1) second side (12), the second side (12) are the side far from the container of the substrate (1).
12. liquid level detection system described in 0 or 11 according to claim 1, which is characterized in that further include: pad (5), and it is described
Chip (4) connection, is arranged second side (12) in the substrate (1), for connecting power supply.
13. a kind of electricity steam box characterized by comprising the described in any item liquid level detection systems of claim 1-12 and setting
There is the water tank (6) of the liquid level detection system；
The bottom of the signal receiver (3) and the sender unit (2) is concordant with the bottom of the water tank (6) respectively, top
Portion is respectively higher than the maximum stage of the water tank (6).
14. electricity steam box according to claim 13, which is characterized in that the water tank (6) further include: shield (61), if
It sets on the side wall of the water tank (6), forms the sky of an accommodating liquid level detection system with the side wall of the water tank (6)
Between.
15. electric steam box described in 3 or 14 according to claim 1, which is characterized in that the water tank (6) further include: elastomeric connector
(62), pinboard (63) and adapter cable (64),
The elastomeric connector (62), is mounted on the pinboard (63), suitable for the pad (5) with the liquid level detection system
Electrical connection；
The pinboard (63) is electric conductor, is fixed on the casing (65) of the water tank (6)；
The adapter cable (64) is arranged on the pinboard (63), for connecting power supply.
16. electric steam box described in 3 or 14 according to claim 1, which is characterized in that further include: display panel is examined with the liquid level
The chip (4) of examining system is electrically connected, for showing the liquid level information.
17. a kind of liquid-level detecting method characterized by comprising
First detection signal is sent to sender unit (2)；Wherein, the sender unit (2) is set to first side of substrate (1)
(11), for sending first detection signal, the substrate (1) is suitable for being arranged on the lateral wall for the container for being contained with liquid, institute
State the side towards the container that the first side (11) are the substrate (1)；
The second detection signal is received from signal receiver (3), the second detection signal passes through institute for the first detection signal
State the signal that liquid is transmitted to the signal receiver (3)；Wherein, the signal receiver (3) is set to the of the substrate (1)
Side (11)；
The liquid level information in the container is obtained according to the first detection signal and the second detection signal.
18. liquid-level detecting method according to claim 17, which is characterized in that it is described according to the first detection signal and
The step of second detection signal obtains the liquid level information in the container, comprising:
According to the first detection signal and the second detection signal acquisition capacitance；
The liquid level information is obtained according to the capacitance.
19. liquid-level detecting method described in 7 or 18 according to claim 1, further includes:
Water amount information is obtained according to the liquid level information；
Judge whether the water amount information is less than preset value；
When the water amount information is less than the preset value, warning message is prompted.
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