CN207395857U - A kind of self-alignment outer patch ultrasonic liquid level switch measuring system - Google Patents
A kind of self-alignment outer patch ultrasonic liquid level switch measuring system Download PDFInfo
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- CN207395857U CN207395857U CN201720903458.7U CN201720903458U CN207395857U CN 207395857 U CN207395857 U CN 207395857U CN 201720903458 U CN201720903458 U CN 201720903458U CN 207395857 U CN207395857 U CN 207395857U
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Abstract
The utility model discloses a kind of self-alignment outer patch ultrasonic liquid level switch measuring systems, including outer patch ultrasonic liquid level switch host, calibration probe, high-order measuring probe and low level measuring probe, the outside for thering is liquid level to put that the calibration probe is put mounted on the empty liquid level that tank level cannot reach or liquid level will not be vented, high-order measuring probe is mounted on the full level alarm point of the exterior upper of tank body, and low level measuring probe is mounted on the low alarm point of the outer lower of tank body；Calibration probe, high-order measuring probe and low level measuring probe are connected with outer patch ultrasonic liquid level switch host.The utility model can be changed by the signal of quasi- probe and the ratio of the signal of high-low-position measuring probe to determine whether there is liquid, the influence of material, thickness, temperature, coupling layer loss to signal can effectively be removed, realize more reliable measurement, without frequently demarcating setting value, installation and debugging workload is few, efficient.
Description
Technical field
The utility model is related to tank level measurement, alarm fields, are specifically a kind of self-alignment outer patch supersonic liquid level
Switch measuring system.
Background technology
At present, the liquid-level switch installed outside container has external labeling type liquid-level switch, outside measuring liquid-level switch etc..Its work
It is to need to detect on the outside of container side wall that measurement head is installed at the monitoring point of liquid level as principle, measurement head emits into chamber wall
Ultrasonic wave, ultrasonic wave repeatedly can form remained shock by roundtrip after entering chamber wall inside between the inner and outer surfaces of chamber wall
Signal.Ultrasonic wave enters the sound pressure transmission coefficient of liquid from container inner wall：
In formula, Z1For the characteristic impedance of container wall materials, Z1=ρ1C1, wherein ρ1For the density of container wall materials, C1To hold
The velocity of sound of wall material；Z2For the characteristic impedance of container inner medium, Z2=ρ2C2, wherein ρ2For the density of container inner medium, C2For
The velocity of sound of container inner medium.
By taking the common used material steel plate of chamber wall as an example, it is assumed that temperature is 20 DEG C, and the liquid in container is water, then according to steel
Characteristic impedance Z=4.80x107kg/(m2S), the characteristic impedance Z=1.48x10 of water6kg/(m2S), the characteristic impedance Z=of air
415kg/(m2S), can be calculated, when liquid level is less than energy converter installation site (medium i.e. in tube wall is air), D
≈ 0.00%, and when liquid level is more than higher than energy converter installation site (medium i.e. in tube wall is water), D ≈ 5.98%.There is liquid
Sound pressure transmission coefficient difference with aneroid is about 6%, therefore, when liquid level is less than monitoring point in container, due to transmission coefficient D=
0, the number of ultrasonic wave roundtrip between the inner and outer surfaces of chamber wall can be relatively more, and energy loss can be slow, remained shock letter
The number of number ripple can be relatively more.And when liquid level is higher than monitoring point in container, since the sound there are sound wave in liquid medium is saturating
It penetrates, the number of ultrasonic wave roundtrip between the inner and outer surfaces of chamber wall can be fewer, and energy loss can be than very fast, remained shock
The number of signal wave can be fewer.Can liquid level be judged by remained shock signal strength in chamber wall.
In the prior art, the measuring method for liquid-level switch being installed outside container be detection ultrasonic wave inside the chamber wall more than
Shake signal, to the amplitude (abbreviation signal value V letters) of rear remained shock signal and the amplitude (letter of setting for a period of time of transmitting ultrasonic signal
Setting value V is claimed to set) it is compared, it is determined as liquid level when signal value V letters are set more than setting value V less than monitoring point, and work as signal
Value V letters are determined as that liquid level is higher than monitoring point when being set less than setting value V.Due to the adhesion layer of inner tank wall surface retrogradation, liquid temperature
Degree, tank body external environment temperature etc. can change so that the variation of signal value V letters is big after installation, and unstability, malfunction rate is high, work
Make stability and poor reliability.Moreover, because the tank skin material of the amplitude of signal and each tank body, wall thickness, liquid component and
Temperature etc. is related, and the V postman on different tank bodies is not very big, it is necessary to the progress field calibration of each tank body, manually adjusts setting value V
If installation and debugging workload is very big, efficiency is low, and service life is about 2-6 months, causes to be actually unable in long-time service.
Utility model content
The purpose of this utility model is to provide one kind by calibrating probe signal amplitude and high-low-position measuring probe signal
The ratio of amplitude changes to determine whether there is the self-alignment outer patch ultrasonic liquid level switch measuring system of liquid, solves outer at present
The liquid-level switch malfunction rate of portion's installation measurement is high, job stability, poor reliability and needs manually periodically mark in use at the scene
It sets the tone school, the problem of installation and debugging workload is very big, efficiency is low.
To achieve the above object, the utility model provides following technical solution：
A kind of self-alignment outer patch ultrasonic liquid level switch measuring system, including outer patch ultrasonic liquid level switch host, school
Quasi- probe, high-order measuring probe and low level measuring probe, the calibration probe are mounted on the empty liquid level that tank level cannot reach
It puts or the outside for having liquid level to put that liquid level will not be vented, high-order measuring probe is mounted on the full level alarm point of tank body exterior upper,
Low level measuring probe is mounted on the low alarm point of tank body outer lower；Calibration probe, high-order measuring probe and low level measurement are visited
Head is connected with outer patch ultrasonic liquid level switch host.
As further program of the utility model：The calibration probe, high-order measuring probe and low level measuring probe are equal
For ultrasonic probe.
As further program of the utility model：The outer patch ultrasonic liquid level switch host, is placed in the tank body
Outside, for controlling the calibration probe, high-order measuring probe and low level measuring probe；
The low level measuring probe, mounted on the outside of the tank body, setting height(from bottom) corresponds to the low of liquid in the tank body
At the alarm point of position, it is connected with the outer patch ultrasonic liquid level switch host, for detecting the situation of low level liquid；
The high position measuring probe, mounted on the outside of the tank body, setting height(from bottom) corresponds to the height of liquid in the tank body
At the alarm point of position, it is connected with the outer patch ultrasonic liquid level switch host, for detecting the situation of high-order liquid；
The calibration probe, mounted on the outside of the tank body, setting height(from bottom) is higher than the high-order measuring probe and institute
Low level measuring probe is stated, is connected with the outer patch ultrasonic liquid level switch host；
The setting height(from bottom) of the calibration probe, high-order measuring probe and low level measuring probe is installation downwards successively.
As further program of the utility model：The calibration probe or high-order measuring probe or low level measuring probe table
When the couplant in face is lost in when degree reaches default value or probe signal is less than default value, outer patch supersonic liquid level
Switch host sends fault-signal to control system.
The self-alignment outside liquid-level switch measuring system of the utility model, can be realized by following measuring method, bag
Include following steps：
Step 1: absorption emits simultaneously respectively in the calibration probe, high-order measuring probe and low level measuring probe of tank wall
The signal that acquisition tank skin internal reflection is returned；
Step 2: outer patch ultrasonic liquid level switch host receives calibration probe, high-order measuring probe and low level measuring probe
Signal, the signal for calibrating probe is：V is calibrated, and the signal of high-order measuring probe is：V high, the signal of low level measuring probe are：
V is low；
Step 3: it is calibrated according to V, V high is low with V draws high signal ratio and low level signal ratio, high signal ratio
=V high/V calibration, low level signal ratio=V is low/V calibrations；
Step 4: judge there is liquid aneroid：If high signal ratio or low level signal ratio higher than setting ratio, just by
It is judged as aneroid.If high signal ratio or low level signal ratio have been judged as liquid less than setting ratio.
As further program of the utility model：The signal of the signal of step 3 alignment probe, high-order measuring probe
Respectively in liquid crystal screen display, meter after being handled with the signal transmission of low level measuring probe to outer patch ultrasonic liquid level switch host 1
In meter body liquid crystal screen display after calculation high signal ratio and low level signal ratio；According to the signal of liquid crystal screen display,
Set ratio.
Compared with prior art, the beneficial effects of the utility model are：
1. the utility model changes to judge by calibrating the amplitude ratio of probe signal and high-low-position measuring probe signal
Whether there is liquid, the influence of material, thickness, temperature, coupling layer loss to signal and level gauging can be effectively eliminated.It realizes more
Reliable and stable measurement；It no longer needs frequently to demarcate setting value, installation and debugging workload is small, efficient, need not carry out frequently
Debugging.
2. whether the signal amplitude size popped one's head in other the utility model carries for having the influence of liquid smaller in measurement tank
The high service life and stability of system.
3. for the prior art, the method compared with being set with setting amplitude V is believed using probe received signal amplitude V,
It is determined as liquid level when signal value V letters are set more than setting value V less than monitoring point, and sentences when signal value V letters are set less than setting value V
It is set to liquid level higher than monitoring point.Although can be seen that from such as Fig. 1 at the same temperature, has signal when liquid and aneroid to have substantially
Difference, can be set by setting suitable setting value V and realize effective measurement at this temperature, but if temperature becomes
Change, there are the letters of signal value V when liquid and aneroid that can also change, be easy for causing liquid in the case where not changing setting value V and setting
The mistake that position judges；Likewise, if medium changes, it can also cause the variation that signal value V believes when having liquid and aneroid, not
Change the mistake that liquid level judgement is easy to cause in the case that setting value V is set.Therefore, the prior art it is narrow there are measurement range, it is necessary to
The shortcomings of often being debugged according to actual condition.And the utility model is calibrated using high signal ratio V high/V and low
Position signal ratio V is low/method of the V calibrations with setting compared with ratio, when high signal ratio or low level signal ratio are higher than
It is determined as liquid level when setting ratio less than monitoring point, and when high signal ratio or low level signal ratio are less than setting ratio
It is determined as that liquid level is higher than monitoring point.Since the calibration probe, high-order measuring probe and low level measurement that are mounted on same tank body are visited
The temperature of head is essentially identical, and therefore, the utility model realizes the automatic benefit to signal intensity caused by temperature, media variations etc.
Repay effective accurate measurement, it can be achieved that under different medium and wide range of temperature.
Description of the drawings
Fig. 1 is the structure diagram of existing outer patch ultrasonic liquid level switch measuring system.
Fig. 2 is that the structure diagram of self-alignment outer patch ultrasonic liquid level switch measuring system (is with empty liquid calibration probe
Example).
Specific embodiment
The technical solution of this patent is described in further detail With reference to embodiment.
Figure is referred to, a kind of self-alignment outer patch ultrasonic liquid level switch measuring system is opened including outer patch supersonic liquid level
Host 1, calibration probe 2, high-order measuring probe 3 and low level measuring probe 4 are closed, the calibration probe 2 is mounted on tank level not
The outside for having liquid level to put that the empty liquid level that can be reached is put or liquid level will not be vented, high-order measuring probe 3 are mounted on the outside of tank body
The full level alarm point on top, low level measuring probe 4 are mounted on the low alarm point of the outer lower of tank body；Calibration probe 2, a high position
Measuring probe 3 and low level measuring probe 4 are connected with outer patch ultrasonic liquid level switch host 1.
Above-mentioned, the effect of calibration probe 2, main realize compensates following factor automatically：Inner wall surface retrogradation is glued
Signal amplitude caused by attached layer, liquid medium variation, fluid temperature variation, tank wall temperature variation changes.
Above-mentioned, calibration probe 2, high-order measuring probe 3 and low level measuring probe 4 are ultrasonic probe, respectively transmitting and
The signal that acquisition tank skin internal reflection is returned.
Above-mentioned, tank body can be ball-type tank, horizontal tank, vertical tank or process tank.
Measuring method based on above system, comprises the following steps：
Step 1: absorption emits respectively in the calibration probe 2, high-order measuring probe 3 and low level measuring probe 4 of tank wall
The signal returned with acquisition tank skin internal reflection；
Step 2: outer patch ultrasonic liquid level switch host receives calibration probe, high-order measuring probe and low level measuring probe
Signal, the signal for calibrating probe is：V is calibrated, and the signal of high-order measuring probe is：V high, the signal of low level measuring probe are：
V is low；
Step 3: it is calibrated according to V, V high is low with V draws high signal ratio and low level signal ratio, high signal ratio
=V high/V calibration, low level signal ratio=V is low/V calibrations.
It is above-mentioned, the signal, the high-order signal of measuring probe and the signal transmission of low level measuring probe of probe are calibrated to outer patch
Respectively in liquid crystal screen display after the processing of ultrasonic liquid level switch host 1, calculate after the amplitude ratio of signal in meter body liquid
Brilliant screen display.
According to the signal of liquid crystal screen display, the ratio of setting signal amplitude sets ratio.
Step 4: judge there is liquid aneroid：If high signal ratio or low level signal ratio higher than setting ratio, just by
It is judged as aneroid, it can be determined that aneroid in the tank body of height where high-order measuring probe or low level measuring probe；If high position letter
Number ratio or low level signal ratio have been judged as liquid, it can be determined that high-order measuring probe or low level less than setting ratio
There is liquid in the tank body of height where measuring probe.
The high-order or low level signal liquid level that can change when liquid level rises and either declines reaches or covers probe position
Signal can decline when putting, and signal can rise the signal strength before being restored to after liquid level is dropped to below probe.
Outer patch ultrasonic liquid level switch measuring system is popped one's head in 3 groups by instrument host 1, high-order probe 2, low level in the prior art
Into since the variation of the adhesion layer and fluid temperature, tank wall temperature of the retrogradation of container inner wall surface can cause reception signal amplitude
Variation so that even in the case where liquid level is constant, the signal value V that pops one's head in after installation letter variation is big, unstability, malfunction
Rate is high, job stability and poor reliability.Moreover, because the amplitude of signal and the tank skin material of each tank body, wall thickness, liquid
Ingredient and temperature etc. are related, and the V postman on different tank bodies is not very big, it is necessary to the progress field calibration of each tank body, manually adjusts
Setting value V is set, and installation and debugging workload is very big, and efficiency is low, and service life is about 2-6 months, causes to be actually unable in make for a long time
With.
The temperature influence that existing outer patch ultrasonic liquid level switch measuring system receives signal is compared, be wall thickness 40mm,
Material is on the same aneroid slack tank of carbon steel, temperature is respectively to be tested at 40 DEG C and -40 DEG C.Test result finds other operating modes not
Influence of the temperature to probe measurement signal is basically identical in the case of change.
The material influence that existing outer patch ultrasonic liquid level switch measuring system receives signal is compared, and is to be in wall thickness
10mm, material are respectively on the tank body of carbon steel and organic glass, are tested at identical temperature, and material pair can be substantially found by comparison
The influence of probe measurement signal is inconsistent.
The tank body wall thickness influence that existing outer patch ultrasonic liquid level switch measuring system receives signal is compared, and is to be in material
Carbon steel, wall thickness are respectively on the tank body of 10mm and 60mm, being tested at identical temperature as a result, can substantially find thickness by comparison
Influence to probe measurement signal is basically identical.
The principle of the utility model is：It receives and adopts known to fluid level condition under the same temperatures that calibration probe 2 is obtained
Collect signal as calibration signal, compare with the signal of high-order measuring probe 3 and low level measuring probe 4, so as to which temperature be overcome to become
Signal amplitude caused by change changes the influence to level gauging, realizes effective survey in -40 DEG C~100 DEG C wide range of temperature
Amount.
The utility model judges that the presence or absence of liquid level is not directly by the comparison between measuring signal amplitude V and setting value V
It realizes, but visits 4 by high-order measuring probe 3 and the signal ratio of calibration probe 2 or low level measurement and pop one's head in 2 with calibration
Comparison between signal ratio and setting ratio is realized.Since what is compared is waveform under same temperature state, no matter
It is to have liquid or aneroid, in the case where fluid level condition is constant, high signal ratio or low level signal ratio is not substantially with temperature
Variation and change, it is achieved thereby that the automatic compensation of temperature, ensure that the correctness that level gauging judges, it is measured
Arrive, 40 DEG C and high signal ratio at -40 DEG C and low level signal ratio are basically unchanged, it was demonstrated that this measuring method it is correct
Property and validity.
The solution of the utility model is：
Amplitude V according to signal is received judges the loss degree or coupling state of couplant, when the signal of probe is attenuated to
When to a certain degree, outer patch ultrasonic liquid level switch host 1 sends a fault-signal to control system, and user is reminded to increase to probe
Add couplant.
The embodiment of this patent is explained in detail above, but this patent is not limited to the above embodiment,
In the knowledge that those of ordinary skill in the art possess, it can also be made on the premise of this patent objective is not departed from each
Kind variation.
Claims (5)
1. a kind of self-alignment outer patch ultrasonic liquid level switch measuring system, including outer patch ultrasonic liquid level switch host, calibration
Probe, high-order measuring probe and low level measuring probe, which is characterized in that the calibration probe, which is mounted on tank level, to be reached
Empty liquid level put or the outside for having liquid level to put that liquid level will not be vented, high-order measuring probe are mounted on the height of the exterior upper of tank body
Position alarm point, low level measuring probe are mounted on the low alarm point of the outer lower of tank body；Calibration probe, high-order measuring probe and
Low level measuring probe is connected with outer patch ultrasonic liquid level switch host.
2. self-alignment outer patch ultrasonic liquid level switch measuring system according to claim 1, which is characterized in that the school
Quasi- probe, high-order measuring probe and low level measuring probe are ultrasonic probe.
3. self-alignment outer patch ultrasonic liquid level switch measuring system according to claim 1, which is characterized in that the school
Quasi- probe, high-order measuring probe and low level measuring probe are that couplant is coated on ultrasonic probe.
4. self-alignment outer patch ultrasonic liquid level switch measuring system according to claim 1, which is characterized in that described outer
Ultrasonic liquid level switch host is pasted, is placed in the outside of the tank body, for controlling the calibration probe, high-order measuring probe and low
Position measuring probe；
The low level measuring probe, mounted on the outside of the tank body, setting height(from bottom) corresponds to the low level report of liquid in the tank body
At alert point, it is connected with the outer patch ultrasonic liquid level switch host, for detecting the situation of low level liquid；
The high position measuring probe, mounted on the outside of the tank body, setting height(from bottom) corresponds to the high-order report of liquid in the tank body
At alert point, it is connected with the outer patch ultrasonic liquid level switch host, for detecting the situation of high-order liquid；
The calibration probe, mounted on the outside of the tank body, setting height(from bottom) is higher than the high-order measuring probe and described low
Position measuring probe, is connected with the outer patch ultrasonic liquid level switch host；
The setting height(from bottom) of the calibration probe, high-order measuring probe and low level measuring probe is installation downwards successively.
5. self-alignment outer patch ultrasonic liquid level switch measuring system according to claim 1, which is characterized in that the school
Quasi- probe or high-order measuring probe or the couplant on low level measuring probe surface are lost in when degree reaches default value or pop one's head in
When signal is less than default value, outer patch ultrasonic liquid level switch host sends fault-signal to control system.
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| CN201720903458.7U CN207395857U (en) | 2017-07-24 | 2017-07-24 | A kind of self-alignment outer patch ultrasonic liquid level switch measuring system |
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| CN201720903458.7U CN207395857U (en) | 2017-07-24 | 2017-07-24 | A kind of self-alignment outer patch ultrasonic liquid level switch measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167219A (en) * | 2017-07-24 | 2017-09-15 | 江苏迅创科技有限公司 | A kind of self-alignment outer patch ultrasonic liquid level switch measuring system and its measuring method |
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- 2017-07-24 CN CN201720903458.7U patent/CN207395857U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167219A (en) * | 2017-07-24 | 2017-09-15 | 江苏迅创科技有限公司 | A kind of self-alignment outer patch ultrasonic liquid level switch measuring system and its measuring method |
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