CN202676239U - Liquid level measuring device converting liquid level signals into air pressure signals - Google Patents
Liquid level measuring device converting liquid level signals into air pressure signals Download PDFInfo
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- CN202676239U CN202676239U CN 201220374406 CN201220374406U CN202676239U CN 202676239 U CN202676239 U CN 202676239U CN 201220374406 CN201220374406 CN 201220374406 CN 201220374406 U CN201220374406 U CN 201220374406U CN 202676239 U CN202676239 U CN 202676239U
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- signal
- liquid level
- sample
- fairlead
- liquid
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
A liquid level measuring device comprises a signal sampling tube, a signal eduction tube and a pressure gauge, the signal sampling tube is vertically placed inside to-be-measured liquid, one end of the signal eduction tube is connected with the signal sampling tube, the other end of the signal eduction tube is connected with the pressure gauge, and the signal eduction tube is provided with a branch tube which is connected with an air supply device. The liquid level measuring device can achieve continuous measurement of liquid levels, is low in cost, and wide in adaptive range, can adapt to measurement of highly corrosive media of muddy liquid, oil, acid, alkali and the like, can be used for general industrial measurement, can also be used for high-precision measurement, can achieve remote transmission, can achieve measurement free of electrical components, and is used for places needing explosion prevention.
Description
Technical field
But the utility model relates to the liquid level emasuring device of the multiple industry of a kind of widespread use.
Background technology
Liquid level emasuring device extensively is incorporated in level gauging, monitoring and the control in the fields such as oil, chemical industry, pharmacy, electric power, metallurgy.Liquid level emasuring device of a great variety, the whole bag of tricks respectively has its different scope of application and environment, and different measuring accuracy.Can be divided into according to the measuring principle difference: pressure survey formula, buoyancy are measured formula, reflection of radar wave formula, ultrasonic reflection type, nuclear radiation formula, condenser type etc.What wherein, usage comparison was many is the liquid level emasuring device that pressure survey formula, buoyancy are measured the principle designs such as formula and reflection of radar wave formula.But magnetic turning column liquid level meter, magnetostriction liquidometer, buoy level meter etc. are measured according to permanent law of buoyancy, have the dress of top and side to fill two kinds of forms, and top dress magnetostriction liquidometer is comprised of the float that feeler and armful feeler fluctuate.Require the verticality of communicating pipe or feeler to get well when instrument is installed, level change is too inviolent, can not contain solid impurity in the medium, otherwise solution causes the float jam.
In the prior art, every class liquid level emasuring device all improves to some extent, for example: patented claim CN90100025.6 discloses a kind of measuring unit for liquid specific gravity and level, has pressure sensor 1, pressure sensor 2, one end is arranged with the long tube 3 of throttling pore and the end short tube 4 with throttling pore, pressure sensor 1 and pressure sensor 2 are housed respectively on long tube 3 and short tube 4 in the throttling pore termination of long tube 3 and short tube 4 compressed air source 5 are arranged, the common central control computer of the whole system of can be 6 and the standard industrial control 7 total with other unit are arranged, be inserted with respectively the analog to digital conversion adaptation module 8 that links to each other with 2 with pressure sensor 1 in the slot of standard industrial control 7, standard industrial control 7 links to each other with central control computer 6 by the standard serial communication interface.
WO2005038415 discloses a kind of liquid level emasuring device, and this device comprises and is arranged on the outer transducer of liquid, can send and accept acoustical signal, links to each other with transducer and extends to waveguide in the liquid.Acoustical signal sends to the waveguide from transducer, and the liquid surface that this signal has waveguide to extend into reflects, and has known delivery time and the speed of signal, just can calculate liquid level.But temperature can affect acoustic propagation velocity, causes the liquid level measured wrong.
Patented claim CN201020531745.8 discloses a kind of liquid level emasuring device, comprise the liquid material bucket, conducting is connected with the end of carbonated drink communicating pipe on the liquid material bucket, the other end conducting of carbonated drink communicating pipe is connected with measures bucket, measure extremely rod of built-in Tan of bucket, and the rapier rod does not contact with the barrel of measuring cylinder, and the data output end of rapier rod is connected with the control treating apparatus.The application of this liquid level emasuring device is narrow, only limits to measure the liquid level of conducting liquid.
All there is defective more or less in above-mentioned liquid level emasuring device, such as, some liquid level emasuring device design comparisons are complicated, operation inconvenience, and some liquid level emasuring devices have requirement to the performance of liquid itself, etc.
Between defects, the special the utility model that proposes.
The utility model content
The purpose of this utility model provides a kind of liquid level emasuring device, and this apparatus structure is simple, usable range wide, convenient operation, and measuring accuracy is high.
For realizing the purpose of this utility model, the technical scheme of taking is:
A kind of liquid level emasuring device that liquid level signal is changed into air pressure signal, comprise sample of signal pipe, signal fairlead and tensimeter, the sample of signal pipe is vertically inserted in the testing liquid, one end and the sample of signal pipe of signal fairlead join, the other end and tensimeter join, be provided with an arm at the signal fairlead, described arm is connected with feeder.
The internal diameter of sample of signal pipe described in the utility model is greater than the internal diameter of signal fairlead.
The internal diameter of sample of signal pipe described in the utility model generally can be at 10-150mm according to environment and the character of measuring liquid, and the internal diameter of signal fairlead generally gets final product at 2-10mm.
Preferably, the internal diameter 20-60mm of sample of signal pipe, the ratio of the internal diameter of signal fairlead are 4-8mm.
Liquid level emasuring device of the present utility model is to utilize liquid level signal to convert the approach of air pressure signal to, indirectly obtains level value by measuring air pressure.The liquid level signal stopple coupon is inserted under the liquid level of testing liquid, feeder by arm continuous to sample of signal pipe and signal fairlead supplied gas, allow gas keep constantly overflowing from the lower end of sample of signal pipe, be that gas is full of whole sample of signal pipe and signal fairlead, guaranteeing does not have liquid to enter in the sample of signal pipe.At this moment, gaseous tension is the fluid column pressure P that the sample of signal infratubal port produces apart from liquid level h in the sample of signal pipe
2, the pressure on testing liquid surface is P
1, the proportion of testing liquid is γ, so:
P
2?=?P
1+γ×h
Can draw thus:
h?=?(P
2-P
1)/γ
P when the testing liquid surface communicates with atmosphere
1=0, then:
h=P
2/γ
When the testing liquid surface does not communicate with atmosphere, can record P by classic method
1
By a bit as can be known: the pressure in the sample of signal pipe depends on the proportion of pressure, liquid level and the testing liquid on testing liquid surface, in the situation that testing liquid proportion γ is known, pressure in the liquid level signal stopple coupon is only relevant with the surface pressing of testing liquid, and when the testing liquid surface communicated with atmosphere, the pressure in the liquid level signal stopple coupon was only relevant with liquid level.Namely certain liquid level correspondence certain pressure reduction (P
2-P
1), when tested liquid level communicates with atmosphere, pressure P corresponding to certain liquid level then
2
Therefore, in the situation that known testing liquid proportion, as long as record pressure reduction (P
2-P
1) or pressure P
2Can obtain liquid level h.
Feeder described in the utility model can be the compression feeder, comprises the compressor of mini air compressor or pressurized air gas bomb or other gases.
Arm can be connected with tensimeter on the spot with the signal fairlead, also can be connected to as required place far away, and with in order to measure, distance can be several meters to 1 kilometer.
Described arm also can be arranged on the upper end of sample of signal pipe.
Described sample of signal pipe and signal fairlead can be made of one; Also can be for what to separate, the method commonly used by prior aries such as shape tube, big or small flanges connects.
The xsect of described sample of signal pipe can be various shapes, comprises circle, square, hexagon etc.
The xsect of described signal fairlead can be various shapes, comprises circle, square, hexagon etc.
Preferably, sample of signal pipe and signal fairlead xsect all are circular.
Compare with the liquid level emasuring device of prior art, the advantage of the liquid level emasuring device that the utility model provides is:
1, air pressure changes with liquid level, can realize the continuous coverage of liquid level;
2, the signal conversion easily is easy to realize, cost is low;
3, accommodation is extensive, can be adapted to the measurement of the strong medium of the corrosivity such as turbid liquid, oil, acid, alkali, namely can be used for general industry and measures, and also can be used for high-precision measurement;
4, air pressure signal is easy to convert to electric signal, can be used for automatic control;
5, can transmit at a distance;
6, can realize measuring without electric component, needing be used for explosion-proof place.
Description of drawings
The structural representation of Fig. 1 liquid level emasuring device of the present utility model.
The structural representation of Fig. 2 another kind of liquid level emasuring device of the present utility model.
Embodiment
The technical solution of the utility model is further set forth and illustrated below in conjunction with embodiment, so that better understand the technical scheme of the utility model protection.
Referring to Fig. 1, a kind of liquid level emasuring device of the present utility model, comprise sample of signal pipe 1, signal fairlead 2 and tensimeter 3, sample of signal pipe 1 is vertically inserted in the testing liquid, one end and the sample of signal pipe 1 of signal fairlead 2 join, the other end and tensimeter 3 join, and are provided with an arm 4 at the signal fairlead, and described arm 4 is connected with feeder.
Sample of signal pipe 1 is different with signal fairlead 2 calibers, the internal diameter of sample of signal pipe is greater than the internal diameter of signal fairlead, in this example, the internal diameter of sample of signal pipe generally can be at 10-150mm according to environment and the character of measuring liquid, and the internal diameter of signal fairlead generally gets final product at 2-10mm.Preferably, the internal diameter 20-60mm of sample of signal pipe, the ratio of the internal diameter of signal fairlead are 4-8mm.
Described arm 4 also can be arranged on the upper end of sample of signal pipe 1, as shown in Figure 2.
The xsect of sample of signal pipe 1, signal fairlead 2 can be various shape, comprise circle, square, hexagon etc., when reality is used, the xsect of sample of signal pipe 1 and signal fairlead 2 can be consistent, also can be inconsistent, this example preferably uses the xsect of sample of signal pipe 1, signal fairlead 2 simultaneously for circular.And sample of signal pipe 1 and signal fairlead 2 can be used as one, also can separate, and by big or small flange or shape tube two pipes are docked.
With gassy in sample of signal pipe and the signal fairlead, can measure the interior pressure of sample of signal pipe with tensimeter, and when the testing liquid surface communicated with atmosphere, the pressure in the liquid level signal stopple coupon was only relevant with liquid level from feeder.Namely certain liquid level correspondence certain pressure reduction (P
2-P
1), when tested liquid level communicates with atmosphere, pressure P corresponding to certain liquid level then
2Can learn the height of known liquid level to be measured.
Claims (10)
1. liquid level emasuring device that liquid level signal is changed into air pressure signal, it is characterized in that, comprise sample of signal pipe (1), signal fairlead (2) and tensimeter (3), sample of signal pipe (1) is vertically inserted in the testing liquid, one end of signal fairlead (2) and sample of signal pipe (1) join, the other end and tensimeter (3) join, and are provided with an arm (4) at the signal fairlead, and described arm (4) is connected with feeder (5).
2. device according to claim 1 is characterized in that, the internal diameter of sample of signal pipe (1) is greater than the internal diameter of signal fairlead (2).
3. device according to claim 2 is characterized in that, the internal diameter of described sample of signal pipe (1) is at 10-150mm, and the internal diameter of signal fairlead (2) is at 2-10mm.
4. device according to claim 3 is characterized in that, the internal diameter 20-60mm of described sample of signal pipe (1), and the ratio of the internal diameter of signal fairlead (2) is 4-8mm.
5. device according to claim 1 is characterized in that, described arm (4) is arranged on the upper end of sample of signal pipe (1).
6. device according to claim 1 is characterized in that, described sample of signal pipe (1) is made of one with signal fairlead (2).
7. device according to claim 1 is characterized in that, described sample of signal pipe (1) is what separate with signal fairlead (2), and connects by the method for shape tube, big or small flange.
8. each described device is characterized in that according to claim 1-7, and the xsect of described sample of signal pipe (1) is circular, square, hexagon.
9. each described device is characterized in that according to claim 1-7, and the xsect of described signal fairlead (2) is circular, square, hexagon.
10. each described device is characterized in that according to claim 1-7, and sample of signal pipe (1) all is circular with signal fairlead (2) xsect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374406 CN202676239U (en) | 2012-07-30 | 2012-07-30 | Liquid level measuring device converting liquid level signals into air pressure signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374406 CN202676239U (en) | 2012-07-30 | 2012-07-30 | Liquid level measuring device converting liquid level signals into air pressure signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202676239U true CN202676239U (en) | 2013-01-16 |
Family
ID=47497138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220374406 Expired - Lifetime CN202676239U (en) | 2012-07-30 | 2012-07-30 | Liquid level measuring device converting liquid level signals into air pressure signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202676239U (en) |
-
2012
- 2012-07-30 CN CN 201220374406 patent/CN202676239U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130116 |
|
| CX01 | Expiry of patent term |