CN208091536U - 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
- Publication number
- CN208091536U CN208091536U CN201820246019.8U CN201820246019U CN208091536U CN 208091536 U CN208091536 U CN 208091536U CN 201820246019 U CN201820246019 U CN 201820246019U CN 208091536 U CN208091536 U CN 208091536U
- Authority
- CN
- China
- Prior art keywords
- lubricating cup
- ultrasonic wave
- liquid level
- ultrasonic
- analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- 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 utility model has the advantage of：Design completely new ultrasonic excitation signalsBy the way of phase hit, jump signal can be received in ultrasonic wave receiving terminal so that the detection of receiving end signal is more simple and accurate；Under the premise of ensureing accuracy of detection, can effectively extension detection device service life, improve product overall performance.
Description
Technical field
The utility model is related to a kind of liquid level emasuring devices, are filled more particularly to a kind of lubricating cup level gauging of range hood
It sets.
Background technology
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
The Chinese invention patent of Patent No. ZL201310653491.5《A kind of range hood oil cup oil level detecting device》Pass through detection
Hot type thermistor on circuit is heated and is detected the temperature of fluid to the fluid 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 accuracy of detection, 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》Such a oil level detecting device is disclosed, 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, accuracy of detection be not high.
Utility model content
Technical problem to be solved in the utility model be for the above-mentioned prior art present situation and a kind of service life is provided
Long and high accuracy of detection range hood oil cup liquid level detection device.
Technical solution is used by the utility model solves above-mentioned technical problem：A kind of lubricating cup liquid level survey of range hood
Measure device, it is characterised in that：The lubricating cup liquid level emasuring device includes that ultrasonic wave transmitting tube, digital analog converter, ultrasonic wave connect
Closed tube, analog-digital converter and main control chip, the digital analog converter are electrically connected ultrasonic wave transmitting tube, and the analog-digital converter is electrically connected
Ultrasonic wave reception pipe is connect, the digital analog converter and analog-digital converter are electrically connected main control chip；The main control chip control
Digital analog 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 over 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 with the regular hour in view of ultrasonic wave receives signal, 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 signal amplitude gradually increased initial period, letter
Number amplitude is kept for the stable stabilization sub stage and signal amplitude mutation stage of saltus step occurs.
Compared with prior art, the utility model has the advantage of：It is lighted for being received in conventional ultrasonic wave ranging scheme
The inaccurate problem of initial pulse detection, designs completely new ultrasonic excitation signalsBy the way of phase hit, connect in ultrasonic wave
Receiving end can receive jump signal so that the detection of receiving end signal is more simple and accurate；Since ultrasonic wave can adapt to respectively
Kind adverse circumstances, there is no conventional contact detection devices can under the premise of ensureing accuracy of detection by interference such as fume pollutions
With the service life of effective extension detection device, product overall performance is improved.
Description of the drawings
Fig. 1 is the lubricating cup liquid level detection device scheme of installation of the utility model embodiment.
Fig. 2 is the system construction drawing of the lubricating cup liquid level detection device of the utility model embodiment.
Fig. 3 is the flow chart of the lubricating cup level measuring method of the utility model embodiment.
Fig. 4 is the comparison of wave shape figure of the ultrasonic excitation signals and ultrasonic wave reception signal of the utility model embodiment.
Fig. 5 is that the ultrasonic wave of the utility model embodiment receives sampling schematic diagram of the signal within the single sampling period.
Fig. 6 is that the ultrasonic wave of the utility model embodiment receives signal from the stabilization sub stage to the oscillogram in mutation stage and adopts
Sample schematic diagram.
Specific implementation mode
The utility model is described in further detail below in conjunction with attached drawing embodiment.
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 ranging principle, specifically, using transit time method TOF (time of flight)：Measure first ultrasonic wave from
Be emitted to and encounter barrier and return to undergone time Δ t (time, Δ t was the transition time), multiplied by with the speed of ultrasonic wave just
Obtain two times of the distance between sound source and barrier.
As shown in Figure 1 and Figure 2, it 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 right over 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 accuracy of detection 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 Δs 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 includes having the following steps：
(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 NsampIt takes
Value ranging from 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 executing next step；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 gradually increases
Initial period, signal amplitude kept for the stable stabilization sub stage and signal amplitude the mutation stage of saltus step occurs, sampled starting
Afterwards, due to not receiving ultrasonic signal at the beginning, the signal amplitude before initial period 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 before initial period.
Until ultrasonic wave receiving terminal receives initial signal, then the sampled signal of initial period 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 higher 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 higher 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 higher 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 preserves the sampled point when the first two sampling period.
Ultrasonic wave receives the sine wave that the signal that the signal stabilization stage receives is stable, the sampling letter of the stabilization sub stage
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 terminal will receive jump signal after receiving stable sine wave signal, and setting ultrasonic wave receives
The time-domain representation of signal is r (t), and ultrasonic wave receives the stabilization sub stage of signal and being distinguished as mutation stage：1. the stabilization sub stage
Maximum sampled value is more 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. for SIN function, derivative is maximum when the phase that is easy to get is 0 or π, that is to say, that the maximum value of stabilization sub stage difference is more 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 higher 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 higher than between adjacent sample values
Difference minimum value Δ ad_min_bef.
There may be certain clock jitters when being sampled in view of ultrasonic wave receiving terminal, when mutation signal, sampling
At the time of point is difficult that directly to collect signal amplitude be zero, in order to reduce the detection error of jump signal collection point, into one
Step improves accuracy of detection, and transition time Δ t can be acquired by the following method in step (4), referring to Fig. 6：
(4.1), take acquire difference be maximum value work as the first two sampled point A1, A2, wherein the corresponding samplings of sampled point A1
Value is ada1<Sampling point value corresponding to 0, sampled point A1 is MAD；The corresponding sampled values of sampled point A2 are ada2>0, sampled point
Sampling point value corresponding to A2 is MAD+1；
(4.2), the time migration relative to sampled point A1 at the time of sampled value is 0 is acquired
(4.3), the time migration carved at the beginning of analog-digital converter starts sampling relative to sampled point A1 is acquired
(4.4), the transition time is obtainedWherein, fsampFor sample frequency.
Then, in conjunction with liquid level formulaCan obtain lubricating cup liquid level is：
The present embodiment is directed to ultrasonic wave in conventional ultrasonic wave ranging scheme and receives that signal starting point amplitude is too small causes to receive
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 terminal sampling later is opened so that it is apparent that ultrasonic wave receiving terminal can accurately obtain signal characteristic variation
Jump signal, it is possible thereby to transition time Δ t accurately be obtained, to ensure the precision of lubricating cup liquid level final detection result.
It is compared to traditional high-precision ultrasonic ranging scheme, is needed using calculating such as Fast Fourier Transform (FFT)s (FFT)
Method, since operand is big, the operational capability of main control chip is prodigious test, and often cost is higher for the main control chip of selection；
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, the main control chip that low cost may be used realizes operation, and 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 generates ultrasonic excitation signalsThe ultrasonic excitation signalsMeet following item
Part：
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.
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.
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 over lubricating cup, and the ultrasonic wave transmitting tube and ultrasonic wave receive tube side-by-side
It is arranged 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 gradually increased initial period, signal amplitude keep stable stabilization to signal amplitude
The mutation stage of saltus step occurs for stage and signal amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820246019.8U CN208091536U (en) | 2018-02-11 | 2018-02-11 | A kind of lubricating cup liquid level emasuring device of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820246019.8U CN208091536U (en) | 2018-02-11 | 2018-02-11 | A kind of lubricating cup liquid level emasuring device of range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208091536U true CN208091536U (en) | 2018-11-13 |
Family
ID=64064518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820246019.8U Active CN208091536U (en) | 2018-02-11 | 2018-02-11 | A kind of lubricating cup liquid level emasuring device of range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208091536U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160603A (en) * | 2018-02-11 | 2019-08-23 | 宁波方太厨具有限公司 | A kind of lubricating cup liquid level emasuring device of range hood |
| CN110186537A (en) * | 2019-06-21 | 2019-08-30 | 珠海格力智能装备有限公司 | Detection method and detection system for equipment liquid level |
| CN110906394A (en) * | 2019-11-06 | 2020-03-24 | 宁波方太厨具有限公司 | Oil cup state detection method of range hood |
-
2018
- 2018-02-11 CN CN201820246019.8U patent/CN208091536U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160603A (en) * | 2018-02-11 | 2019-08-23 | 宁波方太厨具有限公司 | A kind of lubricating cup liquid level emasuring device of range hood |
| CN110160603B (en) * | 2018-02-11 | 2024-01-26 | 宁波方太厨具有限公司 | Oil cup liquid level measuring device of range hood |
| CN110186537A (en) * | 2019-06-21 | 2019-08-30 | 珠海格力智能装备有限公司 | Detection method and detection system for equipment liquid level |
| CN110906394A (en) * | 2019-11-06 | 2020-03-24 | 宁波方太厨具有限公司 | Oil cup state detection method of range hood |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208091536U (en) | A kind of lubricating cup liquid level emasuring device of range hood | |
| US5656774A (en) | Apparatus and method for sensing fluid level | |
| US5898308A (en) | Time-based method and device for determining the dielectric constant of a fluid | |
| EP2198252B1 (en) | System and method for accurately measuring fluid level in a vessel | |
| EP1770409B1 (en) | Time-of-flight-ranging system and method for calibrating such a system | |
| CN102042844B (en) | Sound surface wave measuring sensor and parameter analytical method | |
| CN103940352A (en) | Ultra-high-precision freezing detecting device and real-time freezing thickness detecting method thereof | |
| JP2009204601A (en) | Apparatus and method for measuring suspended solid concentration utilizing time domain reflectometry | |
| KR101688844B1 (en) | Method for determining the starting instant of a periodically oscillating signal response | |
| Mughal et al. | State of the art review of atmospheric icing sensors | |
| CN109357729B (en) | Method for measuring liquid interface level based on guided wave radar liquid level meter | |
| KR20150126532A (en) | method of measuring level of liquid errorless and radar level gauge system using the same | |
| CN110596238A (en) | Ultrasonic detection method for water content of crude oil and detector using same | |
| US9207306B2 (en) | Level measurement instrument fiducial detection method | |
| CN113340382B (en) | Magnetostrictive liquid level meter with adjustable reflection echo and liquid level detection method | |
| GB2358535A (en) | Time domain reflectometry method and apparatus | |
| CN110160603A (en) | A kind of lubricating cup liquid level emasuring device of range hood | |
| CN210690481U (en) | Ultrasonic detector for water content of crude oil | |
| CN110160602A (en) | A kind of lubricating cup level measuring method of range hood | |
| EP3948182A1 (en) | Expert control systems and methods for level measurement | |
| CN201697603U (en) | Ice sensor adopting vibration tube principle | |
| CN2901258Y (en) | Float mark type vehicle oil meter | |
| US20210333137A1 (en) | Ultrasonic measurement method taking account of the quantity of gas bubbles | |
| JP5123046B2 (en) | Relative permittivity / conductivity measuring apparatus and measuring method thereof | |
| CN103674176A (en) | Material level detection method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |