CN110160603A - A kind of lubricating cup liquid level emasuring device of range hood - Google Patents
A kind of lubricating cup liquid level emasuring device of range hood Download PDFInfo
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- CN110160603A CN110160603A CN201810141747.7A CN201810141747A CN110160603A CN 110160603 A CN110160603 A CN 110160603A CN 201810141747 A CN201810141747 A CN 201810141747A CN 110160603 A CN110160603 A CN 110160603A
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- lubricating cup
- ultrasonic
- ultrasonic wave
- liquid level
- analog
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- 230000001050 lubricating effect Effects 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 title claims abstract description 41
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 230000005284 excitation Effects 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 6
- 230000035772 mutation Effects 0.000 claims description 12
- 230000006641 stabilisation Effects 0.000 claims description 12
- 238000011105 stabilization Methods 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 25
- 238000000034 method Methods 0.000 description 8
- 230000007704 transition Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 210000003462 vein Anatomy 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
- G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
A kind of lubricating cup liquid level emasuring device of range hood, it is characterised in that: include ultrasonic wave transmitting tube, digital analog converter, ultrasonic wave reception pipe, analog-digital converter and main control chip, digital analog converter generates ultrasonic excitation signalsMeet following condition:The ultrasonic excitation signalsAt the t=NT moment there are phase hit, the main control chip control analog-digital converter starts at the t=NT moment and carries out sampling processing to ultrasonic reflections signal.The present invention has the advantages that the ultrasonic excitation signals that design is completely newBy the way of phase hit, jump signal can be received in ultrasonic wave receiving end, so that the detection of receiving end signal is more simple and accurate；Under the premise of guaranteeing detection accuracy, can effectively extension detection device service life, improve product overall performance.
Description
Technical field
The present invention relates to a kind of liquid level emasuring devices, more particularly to a kind of lubricating cup liquid level emasuring device of range hood.
Background technique
The greasy dirt that range hood generates in use can be discharged into lubricating cup, in general, the liquid level of lubricating cup inner fluid needs
Artificial observation detection, needs in time to outwell greasy dirt to prevent from overflowing after running up to certain liquid level.In order to facilitate sight
Lubricating cup liquid level is examined, traditional range hood oil cup can use transparent plastics material mostly, but the lubricating cup of plastic material exists by force
Spend problem low, easy to aging；Also there is the lubricating cup using metal material, although intensity is high, observation lubricating cup liquid level is simultaneously inconvenient, i.e.,
Make with the presence of observation window, but be adhered on observation window using rear greasy dirt for a long time, the liquid of lubricating cup can not be seen clearly by also resulting in user
Position.
In view of the above-mentioned problems, occur the various devices detected automatically for lubricating cup liquid level in the prior art, it is such as existing
A kind of Chinese invention patent " range hood oil cup oil level detecting device " of Patent No. ZL201310653491.5 passes through detection
Hot type thermistor on circuit is heated and is detected the temperature of oil liquid to the oil liquid in lubricating cup, and then analyzes and obtain oil
The height of liquid, but the detection mode of this contact can make service life of the electronic component under oil pollution environment drop significantly
It is low, to reduce detection accuracy, influence detection accuracy；For another example application No. is 201510386967.2 Chinese invention applications
" range hood oil cup guards against oil level distant warning device " discloses such a oil level detecting device, and the device is by being placed on lubricating cup
The equipment such as interior floating body detect lubricating cup and guard against liquid level, but the disadvantage of this device is that floating body long-time bubble can be reduced in greasy dirt
Service life, detection accuracy be not high.
Summary of the invention
The technical problem to be solved by the present invention is to provided for above-mentioned state of the art a kind of long service life and
The high range hood oil cup liquid level detection device of detection accuracy.
The technical scheme of the invention to solve the technical problem is: a kind of lubricating cup level gauging of range hood fills
Set, it is characterised in that: the lubricating cup liquid level emasuring device include ultrasonic wave transmitting tube, digital analog converter, ultrasonic wave reception pipe,
Analog-digital converter and main control chip, the digital analog converter are electrically connected ultrasonic wave transmitting tube, and the analog-digital converter electrical connection is super
Acoustic receiver pipe, the digital analog converter and analog-digital converter are electrically connected main control chip；The main control chip controls digital-to-analogue
Converter generates ultrasonic excitation signalsThe ultrasonic excitation signalsMeet following condition:
Wherein, the N is positive integer, and the T is harmonic period and meets ωs0T=2 π, the UmFor ultrasonic exciting
SignalMaximum voltage, the ωs0For resonance angular frequency；The ultrasonic excitation signalsAt the t=NT moment, there are phase jumps
Become, the main control chip control analog-digital converter starts at the t=NT moment and carries out sampling processing to ultrasonic reflections signal.
Preferably, piezoelectric ceramic transducer can be respectively adopted in the ultrasonic wave transmitting tube and ultrasonic wave reception pipe,
Its core devices is piezoelectric vibrator.
Preferably, the sample frequency f of the analog-digital convertersamp=2NsampF, wherein the f is ultrasonic exciting
The frequency and satisfaction of signalThe NsampFor the sampling number in half of sampling period.
As further preferred, described sampling number NsampValue range is 2~16, with Nsamp=8 be best.
In order to facilitate the installation of and the precision and reaction sensitivity of detection are further increased, preferably, the lubricating cup liquid
Level measuring arrangement is arranged in the range hood main body right above the lubricating cup, the ultrasonic wave transmitting tube and ultrasound
Wave reception pipe is arranged side by side and is located in the same horizontal plane.
It is deviated in view of ultrasonic wave receives signal with the regular hour, the variation of signal is emitted according to ultrasonic wave, as
It is preferred that the collected ultrasonic reflections signal of analog-digital converter includes initial phase, the letter that signal amplitude is gradually increased
The mutation stage that number amplitude is kept for the stable stabilization sub stage and signal amplitude jump.
Compared with the prior art, the advantages of the present invention are as follows: arteries and veins is originated for receiving point in conventional ultrasonic wave ranging scheme
The inaccurate problem of punching detection, designs completely new ultrasonic excitation signalsBy the way of phase hit, in ultrasonic wave receiving end
Jump signal can be received, so that the detection of receiving end signal is more simple and accurate；Since ultrasonic wave can adapt to various evils
Bad environment is interfered there is no conventional contact detection device by fume pollution etc., under the premise of guaranteeing detection accuracy, Ke Yiyou
The service life of extension detection device is imitated, product overall performance is improved.
Detailed description of the invention
Fig. 1 is the lubricating cup liquid level detection device scheme of installation of the embodiment of the present invention.
Fig. 2 is the system construction drawing of the lubricating cup liquid level detection device of the embodiment of the present invention.
Fig. 3 is the flow chart of the lubricating cup level measuring method of the embodiment of the present invention.
Fig. 4 is the ultrasonic excitation signals of the embodiment of the present invention and the comparison of wave shape figure of ultrasonic wave reception signal.
Fig. 5 is that the ultrasonic wave of the embodiment of the present invention receives sampling schematic diagram of the signal within the single sampling period.
Fig. 6 is that the ultrasonic wave reception signal of the embodiment of the present invention shows from the stabilization sub stage to the waveform diagram in mutation stage and sampling
It is intended to.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
The present embodiment is related to a kind of lubricating cup liquid level emasuring device of range hood, the lubricating cup liquid level emasuring device of the present embodiment
Using ultrasonic distance measurement principle, specifically, using transit time method TOF (time of flight): measure first ultrasonic wave from
Be emitted to and encounter barrier and return to time Δ t (time, Δ t was the transition time) experienced, multiplied by ultrasonic wave speed just
Obtain two times of the distance between sound source and barrier.
It as shown in Figure 1 and Figure 2, is the lubricating cup liquid level emasuring device schematic diagram of the present embodiment, the setting of lubricating cup liquid level emasuring device
In the range hood main body being located at right above lubricating cup, lubricating cup level gauge has specifically included ultrasonic wave transmitting tube, digital-to-analogue conversion
Device, ultrasonic wave reception pipe, analog-digital converter and main control chip, wherein ultrasonic wave transmitting tube and ultrasonic wave reception pipe are respectively adopted
Piezoelectric ceramic transducer, core devices are piezoelectric vibrator；
Digital analog converter is electrically connected ultrasonic wave transmitting tube, and analog-digital converter is electrically connected ultrasonic wave reception pipe, digital analog converter
It is electrically connected main control chip with analog-digital converter, also, in order to further increase detection accuracy and reaction sensitivity, ultrasonic wave
Transmitting tube and ultrasonic wave reception pipe are set in same level, it is ensured that ultrasonic signal be sent to lubricating cup liquid level and from
It is the shortest distance that the ultrasonic wave of lubricating cup liquid level reflection, which receives signal, improves the reaction sensitivity of detection device；
Main control chip controls digital analog converter and generates ultrasonic excitation signalsThe ultrasonic excitation signalsMeet as follows
Condition:
Wherein, N is positive integer, and T is harmonic period and meets ωs0T=2 π, UmFor ultrasonic excitation signalsMaximum
Voltage, ωs0For resonance angular frequency；The ultrasonic excitation signalsAt the t=NT moment, there are phase hit, the main control chips
Control analog-digital converter starts at the t=NT moment and carries out sampling processing to ultrasonic reflections signal
Height of the ultrasonic wave transmitting tube apart from lubricating cup bottom surface being set as H, lubricating cup liquid level is h, according to transit time method,
Formula can be obtained: C Δ t=2 (H-h), wherein C is the aerial spread speed of ultrasonic wave；Ultrasonic wave is carried out by air
It encounters lubricating cup fluid level after propagation to reflect, the reflection signal received is sent to modulus by final ultrasonic wave reception pipe
Converter carries out sampling processing.
As shown in Fig. 3~Fig. 6, the lubricating cup level measuring method of the present embodiment comprises the following steps that
(1), main control chip control digital analog converter generates ultrasonic excitation signals
(2), main control chip control analog-digital converter starts at the t=NT moment, and the sampling module of analog-digital converter is to ultrasound
Wave reflection signal carries out sampling processing；Set the sample frequency f of analog-digital convertersamp=2NsampF, wherein f swashs for ultrasonic wave
Encourage the frequency and satisfaction of signalNsampFor the sampling number in half of sampling period, referring to Fig. 5, sampling number Nsamp
Value range is 2~16, the preferred N of the present embodimentsamp=8, i.e. the sampling number within a sampling period is 16；
(3), main control chip judges whether present sample signal occurs sign mutation, if so, then performing the next step rapid；Such as
It is no, then recycle this step；
(4), main control chip calculates transition time Δ t of the analog-digital converter when receiving jump signal；
(5), liquid level is acquiredWherein, H is height of the ultrasonic wave transmitting tube apart from lubricating cup bottom surface, h
For lubricating cup liquid level, C is the aerial spread speed of ultrasonic wave.
In above-mentioned steps (2), the collected ultrasonic reflections signal of analog-digital converter includes that signal amplitude is gradually increased
Initial phase, signal amplitude mutation stage for being kept for the stable stabilization sub stage and signal amplitude jump, sampled in starting
Afterwards, due to not receiving ultrasonic signal at the beginning, the signal amplitude before initial phase is zero.
According to the waveform of ultrasonic excitation signals, it is approximately sinusoidal signal that the ultrasonic wave of the present embodiment, which receives signal, setting
Current sample values are ad_now, and a preceding sampled value for current sample values is ad_bef, the difference between current adjacent sample values
Δ ad_now=ad_now-ad_bef, before the difference DELTA ad_bef=ad_bef-ad_bef ' between adjacent sample values,
In, ad_bef ' is an again preceding sampled value adjacent with a preceding sampled value；
If current sample values are equal to sampled value before and are zero, i.e. ad_now=ad_bef=0, then it represents that ultrasonic wave receives
End receives ultrasonic reflections signal not yet, and ultrasonic wave receives signal and is in front of initial phase.
Until ultrasonic wave receiving end receives initial signal, then the sampled signal of initial phase includes following characteristics:
A, the maximum value ad_max_bef of sampled value before the maximum value ad_max_now of current sample values is all larger than；
B, the minimum value ad_min_bef of sampled value before the minimum value ad_min_now of current sample values is respectively less than；
C, before the difference maximum value Δ ad_max_now between current adjacent sample values is all larger than between adjacent sample values
Difference maximum value Δ ad_max_bef；
D, before the difference minimum value Δ ad_min_now between current adjacent sample values is all larger than between adjacent sample values
Difference minimum value Δ ad_min_bef.
Tetra- features of above a, b, c, d show that ultrasonic wave initially receives ultrasonic signal rising after the reflection of lubricating cup liquid level
Beginning signal, meanwhile, main control chip saves the sampled point for working as the first two sampling period.
It is stable sine wave that ultrasonic wave, which receives the signal that the signal stabilization stage receives, and the sampling of the stabilization sub stage is believed
Number include following characteristics:
A, the maximum value ad_max_bef of sampled value before the maximum value ad_max_now of current sample values is equal to；
B, the minimum value ad_min_bef of sampled value before the minimum value ad_min_now of current sample values is equal to；
C, before the difference maximum value Δ ad_max_now between current adjacent sample values is equal between adjacent sample values
Difference maximum value Δ ad_max_bef；
D, before the difference minimum value Δ ad_min_now between current adjacent sample values is equal between adjacent sample values
Difference minimum value Δ ad_min_bef.
Ultrasonic wave receiving end will receive jump signal after receiving stable sine wave signal, and setting ultrasonic wave receives
The time domain of signal is expressed as r (t), ultrasonic wave receives the difference of the stabilization sub stage and mutation stage of signal are as follows: the 1. stabilization sub stage
Maximum sampled value is greater than the maximum sampled value in mutation stage, and the minimum sampled value of stabilization sub stage is less than the minimum sampling in mutation stage
Value；2. derivative is maximum when the phase that is easy to get is 0 or π for SIN function, that is to say, that the maximum value of stabilization sub stage difference is greater than prominent
The maximum value of change stage difference, the minimum value of stabilization sub stage difference are less than the minimum value of mutation stage difference.
Therefore, during transforming to the mutation stage from the stabilization sub stage, the sampled signal in the mutation stage includes following
Feature:
A, the maximum value ad_max_bef of sampled value before the maximum value ad_max_now of current sample values is respectively less than；
B, the minimum value ad_min_bef of sampled value before the minimum value ad_min_now of current sample values is all larger than；
C, before the difference maximum value Δ ad_max_now between current adjacent sample values is respectively less than between adjacent sample values
Difference maximum value Δ ad_max_bef；
D, before the difference minimum value Δ ad_min_now between current adjacent sample values is all larger than between adjacent sample values
Difference minimum value Δ ad_min_bef.
There may be certain clock jitters when in view of the sampling of ultrasonic wave receiving end, when mutation signal, sampling
Point is difficult directly to collect signal amplitude at the time of be zero, in order to reduce the detection error of jump signal collection point, into one
Step improves detection accuracy, and transition time Δ t can be acquired by the following method in step (4), referring to Fig. 6:
(4.1), taking and acquiring difference is maximum value as the first two sampled point A1, A2, wherein the corresponding sampling of sampled point A1
Value is ada1Sampling point value corresponding to < 0, sampled point A1 is MAD；The corresponding sampled value of sampled point A2 is ada2> 0, sampled point
Sampling point value corresponding to A2 is MAD+1；
(4.2), time migration at the time of sampled value is 0 relative to sampled point A1 is acquired
(4.3), the time migration at the beginning of analog-digital converter starting samples relative to sampled point A1 is acquired
(4.4), the transition time is obtainedWherein, fsampFor sample frequency.
Then, in conjunction with liquid level formulaAvailable lubricating cup liquid level are as follows:
The present embodiment receives that signal starting point amplitude is too small to be caused to receive for ultrasonic wave in conventional ultrasonic wave ranging scheme
The problem for holding initial pulse detection inaccurate, devises completely new ultrasonic excitation signalsUsing ultrasonic wave transmitting terminal phase hit
The mode that ultrasonic wave receiving end sampling later is opened enables ultrasonic wave receiving end accurately to obtain signal characteristic variation apparent
Jump signal, it is possible thereby to transition time Δ t accurately be obtained, to guarantee the precision of lubricating cup liquid level final detection result.
It is compared to traditional high-precision ultrasonic ranging scheme, needs to calculate using Fast Fourier Transform (FFT) (FFT) etc.
Method, since operand is big, the operational capability of main control chip is very big test, the main control chip of selection often higher cost；
The present embodiment then devises the ultrasonic high accuracy distance measuring method based on time domain, only carries out plus-minus fortune to the modulus signal after sampling
It calculates, operation can be realized using the main control chip of low cost, not only arithmetic speed is fast, but also the range accuracy measured is high, product
Dependable with function it is strong.
Claims (6)
1. a kind of lubricating cup liquid level emasuring device of range hood, it is characterised in that: the lubricating cup liquid level emasuring device includes super
Sound wave transmitting tube, digital analog converter, ultrasonic wave reception pipe, analog-digital converter and main control chip, the digital analog converter electrical connection
Ultrasonic wave transmitting tube, the analog-digital converter are electrically connected ultrasonic wave reception pipe, the digital analog converter and analog-digital converter difference
It is electrically connected main control chip；The main control chip control digital analog converter generates ultrasonic excitation signalsThe ultrasonic exciting letter
NumberMeet following condition:
Wherein, the N is positive integer, and the T is harmonic period and meets ωs0T=2 π, the UmFor ultrasonic excitation signalsMaximum voltage, the ωs0For resonance angular frequency；
The ultrasonic excitation signalsAt the t=NT moment, there are phase hits, and the main control chip control analog-digital converter is in t
=NT the moment starts and carries out sampling processing to ultrasonic reflections signal.
2. the lubricating cup liquid level emasuring device of range hood according to claim 1, it is characterised in that: the ultrasonic wave hair
It penetrates pipe and piezoelectric ceramic transducer is respectively adopted in ultrasonic wave reception pipe.
3. the lubricating cup liquid level emasuring device of range hood according to claim 1, it is characterised in that: the analog-digital converter
Sample frequency fsamp=2NsampF, wherein the f is the frequency and satisfaction of ultrasonic excitation signalsThe Nsamp
For the sampling number in half of sampling period.
4. the lubricating cup liquid level emasuring device of range hood according to claim 3, it is characterised in that: the sampling number
NsampValue range is 2~16.2~
5. the lubricating cup liquid level emasuring device of range hood according to claim 1, it is characterised in that: the lubricating cup liquid level is surveyed
Amount device is arranged in the range hood main body right above the lubricating cup, and the ultrasonic wave transmitting tube and ultrasonic wave connect
Closed tube is arranged side by side and is located in the same horizontal plane.
6. the lubricating cup liquid level emasuring device of range hood according to claim 1, it is characterised in that: the analog-digital converter
Collected ultrasonic reflections signal includes that initial phase for being gradually increased of signal amplitude, signal amplitude keep stable stabilization
The mutation stage that stage and signal amplitude jump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141747.7A CN110160603B (en) | 2018-02-11 | 2018-02-11 | Oil cup liquid level measuring device of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141747.7A CN110160603B (en) | 2018-02-11 | 2018-02-11 | Oil cup liquid level measuring device of range hood |
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| Publication Number | Publication Date |
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| CN110160603A true CN110160603A (en) | 2019-08-23 |
| CN110160603B CN110160603B (en) | 2024-01-26 |
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ID=67634978
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810141747.7A Active CN110160603B (en) | 2018-02-11 | 2018-02-11 | Oil cup liquid level measuring device of range hood |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113109434A (en) * | 2021-04-13 | 2021-07-13 | 重庆山外山血液净化技术股份有限公司 | Precise ultrasonic bubble detection device and detection method |
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| CN208091536U (en) * | 2018-02-11 | 2018-11-13 | 宁波方太厨具有限公司 | A kind of lubricating cup liquid level emasuring device of range hood |
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2018
- 2018-02-11 CN CN201810141747.7A patent/CN110160603B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| CN2432568Y (en) * | 2000-07-13 | 2001-05-30 | 蒋志高 | Ultrasonic level and volume measuring instrument special for underground tank of double-fuel fuel-filling and gas-filling station |
| US20060022680A1 (en) * | 2003-04-28 | 2006-02-02 | Takehiko Suginouchi | Ultrasonic distance measure |
| EP1859236A1 (en) * | 2005-03-18 | 2007-11-28 | Hella KGaA Hueck & Co. | Device for measuring the level of a liquid in a container by means of an ultrasonic converter |
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| CN110160603B (en) | 2024-01-26 |
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