CN109709165A - A kind of dish-washing machine cleanliness detection method based on relative dielectric constant - Google Patents
A kind of dish-washing machine cleanliness detection method based on relative dielectric constant Download PDFInfo
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- CN109709165A CN109709165A CN201811487904.6A CN201811487904A CN109709165A CN 109709165 A CN109709165 A CN 109709165A CN 201811487904 A CN201811487904 A CN 201811487904A CN 109709165 A CN109709165 A CN 109709165A
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Abstract
The dish-washing machine cleanliness detection method based on relative dielectric constant that the invention discloses a kind of comprising following steps: it is out-of-date that the water outlet of dish-washing machine has water to flow through, and capacitive detection circuit reads the detection signal for being mounted on the first detection device of water outlet；The detection signal read is sent to operational amplifier by capacitive detection circuit；After operational amplifier will test signal amplification, it is sent to single-chip microcontroller；Single-chip microcontroller calculates the relative dielectric constant ε of the medium between the electrode A and electrode B of the first detection device according to detection signalr；If relative dielectric constant εrIn critical field, then determine the water body of dish-washing machine water outlet for clean water body；If relative dielectric constant εrNot in critical field, then determine the water body of dish-washing machine water outlet for non-clean water body.This programme is at low cost, not vulnerable to pollution and influence detection accuracy, be suitable for all dish-washing machines.
Description
Technical field
The present invention relates to dish-washing machine fields, detect more particularly, to a kind of dish-washing machine cleanliness based on relative dielectric constant
Method.
Background technique
Dish-washing machine is the equipment of the tablewares such as automatic cleaning bowl, chopsticks, disk, dish, knife, fork.In cleaning process, accurate judgement tableware
Whether can save water power, save the time if rinsing well.Currently existing scheme is detected generally by liquid turbidity detector and is rinsed
The turbidity of water, turbidity detector detect the particulate matter in liquid using the scattering light for being reflected into detector is received, but this
After method light source and detector are difficult to accomplish consistency, need to demarcate, and camera lens is contaminated, testing result also will receive influence,
Environment temperature difference will affect the transmitting and reception of light source simultaneously, to influence measurement accuracy, big, cost that there are production difficulties
The defects of high, using by limitation.
The conductivity of pure water is very low, therefore has the open conductivity by detection water quality in the prior art to judge to wash
Whether bowl machine flushing water has reached neatness standard.But the water that conductivity is low, not necessarily pure water, because of many substances
Conductivity it is very low, such as the conductivity of Conductivity Ratio pure water of limestone wants up to ten million times small, it is assumed that has conductivity in water
Very low substance, measures that conductivity is still very low, so the small water of conductivity can not illustrate to be exactly pure water.
Summary of the invention
The present invention be mainly solve the prior art present in detection dish-washing machine cleanliness scheme it is at high cost, vulnerable to dirt
Dye, the low technical problem of precision, provide it is a kind of it is at low cost, not vulnerable to pollution and influence detection accuracy based on relative dielectric constant
Dish-washing machine cleanliness detection method.
What the present invention was mainly addressed by following technical proposals in view of the above technical problems: one kind is situated between based on opposite
The dish-washing machine cleanliness detection method of electric constant, comprising the following steps:
S01, dish-washing machine to have water to flow through out-of-date for water outlet, capacitive detection circuit reads the first detection for being mounted on water outlet
The detection signal of device；
The detection signal read is sent to operational amplifier by S02, capacitive detection circuit；
After S03, operational amplifier will test signal amplification, it is sent to single-chip microcontroller；
S04, single-chip microcontroller calculate the opposite of the medium between the electrode A and electrode B of the first detection device according to detection signal
Permittivity εr；
If S05, relative dielectric constant εrIn critical field, then determine the water body of dish-washing machine water outlet for clean water
Body；If relative dielectric constant εrNot in critical field, then determine the water body of dish-washing machine water outlet for non-clean water body.
If the water body of dish-washing machine water outlet is non-clean water body, dish-washing machine continues to rinse, until the first detection
The relative dielectric constant ε of medium between the electrode A and electrode B of devicerIn critical field.
Even tens times of several times smaller than the relative dielectric constant of water of the relative dielectric constant of impurity in water, so in water
Impurity is more, and the relative dielectric constant of water is smaller, then according to this principle, as long as measurement water outlet to dielectric constant, so that it may
To judge the turbidity of water outlet.This programme judges to rinse by detecting the water body relative dielectric constant of water outlet whether terminate, and ties
Structure is simple and the problem of influencing precision there is no contaminated.
Preferably, critical field is more than or equal to 78 in the step S05.
The relative dielectric constant of pure water is 80, and when having impurity in water in dishwasher into operation, general impurity is dust
Or food residue, and the relative dielectric constant of these substances can less than 10, this minor change after operational amplifier amplifies,
When measuring C < 78S/4 π kd, it can be learnt that the requirement of cleanliness has not been reached yet in the water in dishwasher into operation.
Preferably, step S04 specifically:
Capacitance C between S041, acquisition electrode A and electrode B；
S042, pass through formulaThe relative dielectric constant of the medium between electrode A and electrode B is calculated
εr, k is that (numerical value is 8.988 × 10 to electrostatic force constant in formula9N·m2/C2), d is the distance between electrode A and electrode B, and S is electricity
The positive area of pole A and electrode B.
Even tens times of several times smaller than the dielectric constant of water of the dielectric constant of suspended matter, so suspended matter is more, dielectric
Constant is smaller, and capacitor C can also change, it is possible thereby to learn the capacitor C between two-plate, the turbidity with water is inversely proportional,
The turbidity of water namely between two-plate is bigger, and the capacitor C between two-plate is smaller.
Preferably, step S04 is further comprising the steps of:
S043, the relative dielectric constant that water inlet end water body is detected by the second detection device that dish-washing machine water inlet end is arranged in
εr0；
In step S05, critical field is more than or equal to 78 and εrWith εr0Difference be less than or equal to 1%.
It can be further improved the accuracy of judging result by the relative dielectric constant detection of water inlet.
First detection device and second detection device all include a plastic shell, and electrode A and electrode B are inlaid in outside plastics
On shell, electrode A and electrode B are all plate electrode and are arranged in parallel relatively that electrode A and electrode B are wired to capacitor inspection
Slowdown monitoring circuit.Capacitive detection circuit is connected to single-chip microcontroller by operational amplifier.To improve accuracy, it is additionally provided in detection device
Temperature signal is sent single-chip microcontroller by temperature sensor, temperature sensor, for being modified to testing result.
Bring substantial effect of the present invention is can accurately to detect the cleanliness of dish-washing machine water outlet water flow, ensure
Water source and electric energy are saved in the case where rinsing well, save the working time, vulnerable to pollution, not at low cost.
Detailed description of the invention
Fig. 1 is a kind of structure of the detecting device schematic diagram of the invention；
Fig. 2 is a kind of partial circuit block diagram of the invention；
In figure: 1, electrode A；2, electrode B；3, temperature sensor；4, plastic shell；5, screw thread；6, nut is installed；7, it leads
Line；8, the first detection device；9, capacitive detection circuit；10, temperature sensing circuit；11, operational amplifier；12, single-chip microcontroller.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1: a kind of dish-washing machine cleanliness detection method based on relative dielectric constant of the present embodiment, including it is following
Step:
S01, dish-washing machine to have water to flow through out-of-date for water outlet, capacitive detection circuit 9 reads the first inspection for being mounted on water outlet
Survey the detection signal of device 8；
The detection signal read is sent to operational amplifier 11 by S02, capacitive detection circuit；
After S03, operational amplifier will test signal amplification, it is sent to single-chip microcontroller 12；
S04, single-chip microcontroller calculate the opposite of the medium between the electrode A and electrode B of the first detection device according to detection signal
Permittivity εr；
If S05, relative dielectric constant εrIn critical field, then determine the water body of dish-washing machine water outlet for clean water
Body；If relative dielectric constant εrNot in critical field, then determine the water body of dish-washing machine water outlet for non-clean water body.
If the water body of dish-washing machine water outlet is non-clean water body, dish-washing machine continues to rinse, until the first detection
The relative dielectric constant ε of medium between the electrode A and electrode B of devicerIn critical field.
Fig. 2 show the circuit block diagram between the first detection device and single-chip microcontroller.
Even tens times of several times smaller than the relative dielectric constant of water of the relative dielectric constant of impurity in water, so in water
Impurity is more, and the relative dielectric constant of water is smaller, then according to this principle, as long as measurement water outlet to dielectric constant, so that it may
To judge the turbidity of water outlet.This programme judges to rinse by detecting the water body relative dielectric constant of water outlet whether terminate, and ties
Structure is simple and the problem of influencing precision there is no contaminated.
In the step S05, critical field is more than or equal to 78.
The relative dielectric constant of pure water is 80, and when having impurity in water in dishwasher into operation, general impurity is dust
Or food residue, and the relative dielectric constant of these substances can less than 10, this minor change after operational amplifier amplifies,
When measuring C < 78S/4 π kd, it can be learnt that the requirement of cleanliness has not been reached yet in the water in dishwasher into operation.
Step S04 specifically:
Capacitance C between S041, acquisition electrode A and electrode B；
S042, pass through formulaThe relative dielectric constant of the medium between electrode A and electrode B is calculated
εr, k is that (numerical value is 8.988 × 10 to electrostatic force constant in formula9N·m2/C2), d is the distance between electrode A and electrode B, and S is electricity
The positive area of pole A and electrode B.
Even tens times of several times smaller than the dielectric constant of water of the dielectric constant of suspended matter, so suspended matter is more, dielectric
Constant is smaller, and capacitor C can also change, it is possible thereby to learn the capacitor C between two-plate, the turbidity with water is inversely proportional,
The turbidity of water namely between two-plate is bigger, and the capacitor C between two-plate is smaller.
As shown in Figure 1, the first detection device includes a plastic shell 4, electrode A 1 and electrode B 2 are inlaid in plastic shell
On, electrode A and electrode B are all plate electrode and are arranged in parallel relatively, and electrode A and electrode B pass through conducting wire 7 and be connected to capacitance detecting
Circuit.Capacitive detection circuit is connected to single-chip microcontroller by operational amplifier.First detection device is mounted on water outlet by screw thread 5
On the installation nut 6 of sum.To improve accuracy, it is additionally provided with temperature sensor 3 in the first detection device, temperature sensor passes through
Temperature signal is sent single-chip microcontroller by temperature sensing circuit 10, for being modified to testing result.Second detection device structure
It is identical as the first detection device.Capacitive detection circuit can be using LC concussion recirculating loop frequency method or the detection of RC circuit time constant method
Capacitance.
A kind of embodiment 2: dish-washing machine cleanliness detection method of the present embodiment, comprising the following steps:
S01, dish-washing machine to have water to flow through out-of-date for water outlet, capacitive detection circuit reads the first detection for being mounted on water outlet
The detection signal of device；
The detection signal read is sent to operational amplifier by S02, capacitive detection circuit；
After S03, operational amplifier will test signal amplification, it is sent to single-chip microcontroller；
S04, single-chip microcontroller calculate the opposite of the medium between the electrode A and electrode B of the first detection device according to detection signal
Permittivity εr；
If S05, relative dielectric constant εrIn critical field, then determine the water body of dish-washing machine water outlet for clean water
Body；If relative dielectric constant εrNot in critical field, then determine the water body of dish-washing machine water outlet for non-clean water body；
If the water body of S06, dish-washing machine water outlet are non-clean water body, dish-washing machine continues to rinse, until first
The relative dielectric constant ε of medium between the electrode A and electrode B of detection devicerIn critical field.
Step S04 specifically:
Capacitance C between S041, acquisition electrode A and electrode B；
S042, pass through formulaThe relative dielectric constant of the medium between electrode A and electrode B is calculated
εr, k is that (numerical value is 8.988 × 10 to electrostatic force constant in formula9N·m2/C2), d is the distance between electrode A and electrode B, and S is electricity
The positive area of pole A and electrode B；
S043, the relative dielectric constant that water inlet end water body is detected by the second detection device that dish-washing machine water inlet end is arranged in
εr0；
In step S05, critical field is more than or equal to 78 and εrWith εr0Difference be less than or equal to 1%.
It can be further improved the accuracy of judging result by the relative dielectric constant detection of water inlet.
Remaining feature is same as Example 1.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Although the terms such as cleanliness, relative dielectric constant, detection device are used more herein, use is not precluded
A possibility that other terms.The use of these items is only for be more convenient to describe and explain essence of the invention；Them
Being construed to any additional limitation is disagreed with spirit of that invention.
Claims (4)
1. a kind of dish-washing machine cleanliness detection method based on relative dielectric constant, which comprises the following steps:
S01, dish-washing machine to have water to flow through out-of-date for water outlet, capacitive detection circuit reads the first detection device for being mounted on water outlet
Detection signal；
The detection signal read is sent to operational amplifier by S02, capacitive detection circuit；
After S03, operational amplifier will test signal amplification, it is sent to single-chip microcontroller；
S04, single-chip microcontroller calculate the opposite dielectric of the medium between the electrode A and electrode B of the first detection device according to detection signal
Constant εr；
If S05, relative dielectric constant εrIn critical field, then determine the water body of dish-washing machine water outlet for clean water body；If
Relative dielectric constant εrNot in critical field, then determine the water body of dish-washing machine water outlet for non-clean water body.
2. a kind of dish-washing machine cleanliness detection method based on relative dielectric constant according to claim 1, feature exist
In in the step S05, critical field is more than or equal to 78.
3. a kind of dish-washing machine cleanliness detection method based on relative dielectric constant according to claim 1, feature exist
In step S04 specifically:
Capacitance C between S041, acquisition electrode A and electrode B；
S042, pass through formulaThe relative dielectric constant ε of the medium between electrode A and electrode B is calculatedr, formula
Middle k is electrostatic force constant, and d is the distance between electrode A and electrode B, and S is the positive area of electrode A and electrode B.
4. a kind of dish-washing machine cleanliness detection method based on relative dielectric constant according to claim 3, feature exist
In step S04 is further comprising the steps of:
S043, the relative dielectric constant ε that water inlet end water body is detected by the second detection device that dish-washing machine water inlet end is arranged inr0；
In step S05, critical field is more than or equal to 78 and εrWith εr0Difference be less than or equal to 1%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110226906A (en) * | 2019-06-28 | 2019-09-13 | 华帝股份有限公司 | Turbidity detection method and detection system for dish washing machine |
| CN111366546A (en) * | 2019-09-11 | 2020-07-03 | 添可智能科技有限公司 | Cleanliness detection method, cleaning device and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110226906A (en) * | 2019-06-28 | 2019-09-13 | 华帝股份有限公司 | Turbidity detection method and detection system for dish washing machine |
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