CN114942055A - Tuning fork liquid level switch and liquid level detection method - Google Patents
Tuning fork liquid level switch and liquid level detection method Download PDFInfo
- Publication number
- CN114942055A CN114942055A CN202210530165.4A CN202210530165A CN114942055A CN 114942055 A CN114942055 A CN 114942055A CN 202210530165 A CN202210530165 A CN 202210530165A CN 114942055 A CN114942055 A CN 114942055A
- Authority
- CN
- China
- Prior art keywords
- tuning fork
- switch
- liquid level
- heating
- arc
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 80
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 94
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 102000004315 Forkhead Transcription Factors Human genes 0.000 claims description 8
- 108090000852 Forkhead Transcription Factors Proteins 0.000 claims description 8
- 239000003502 gasoline Substances 0.000 claims description 8
- 239000003350 kerosene Substances 0.000 claims description 8
- 229910003460 diamond Inorganic materials 0.000 claims description 6
- 239000010432 diamond Substances 0.000 claims description 6
- 239000002283 diesel fuel Substances 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 56
- 238000005259 measurement Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
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
- G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
- G01N2009/006—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis vibrating tube, tuning fork
Abstract
The invention provides a tuning fork liquid level switch which comprises a temperature control system and a tuning fork switch, wherein the temperature control system comprises a first heating structure and a temperature detection structure; and a second heating structure is arranged on the tuning fork switch. According to the tuning fork liquid level switch and the liquid level detection method using the tuning fork liquid level switch, the upper limit and the lower limit of the density of liquid detected by the tuning fork liquid level switch are reduced, different liquid densities can be accurately detected, and therefore the tuning fork liquid level switch is applied to detecting the interface of a mixed oil transportation product. Compared with the prior art that temperature compensation is only carried out on the tuning fork or temperature control is carried out on the tuning fork, the temperature of the transmission medium, particularly the temperature of the medium at the head of the tuning fork, is controlled within a small fluctuation range by using the oil transmission pipe with a specific angle and an external heating control method, so that the oil density of the test point is accurately obtained by using the relation between the oil density and vibration when oil is transmitted at a specific pressure, and the oil conveying direction can be controlled.
Description
Technical Field
The invention belongs to the field of interface monitoring, and particularly relates to the field of oil product interface control during mixed oil transportation.
Background
The tuning fork liquid level switch is an important sensor for measuring liquid level in the prior art, and the liquid level height can be monitored by adopting the tuning fork liquid level switch in light industry, metallurgy and the like. When the tuning fork is in air, the vibration frequency will be at a level, but when the liquid in the tank rises to contact the tuning fork, the vibration frequency will drop. Or the opposite applies when the tuning fork is often in a liquid environment, and the frequency will rise as the liquid falls below the level of the tuning fork. The two kinds of use are positions of tested liquid and gas interfaces, and the measurement difficulty of the two kinds of liquid interfaces is difficult to realize by adopting a tuning fork liquid level switch because the difference of resonance frequencies between the liquids is small, the external interference is large, and the error is difficult to eliminate through the frequency test.
However, tuning forks are also used as densitometers, because materials of different densities have different influences on tuning fork vibration, detection of different liquid interfaces can be realized if liquid level control can be performed by means of environment tested by the densitometer, and the device has important application in the field of pipeline mixing and conveying.
In the patent cn201780049126.x published by rossmont measurements limited or improvements relating to vibrating tuning fork level switches, it is stated that the switching point will shift due to variations in medium density, process temperature and process pressure, so in practice it is only satisfactory for switches to be used in a medium of substantially constant density and under substantially the same environmental conditions, the effects of temperature and pressure are linear and can therefore be easily compensated for. To address this problem, model 2160 has three selectable density operating ranges that can be selected by the HART command setting, and model 2130 has two selectable density operating ranges, and a vibrating tuning fork level switch with the ability to select the density operating range by manually operating the dial can also be obtained. Rosmont measurements, Inc. establishes a relationship between WFF and density through a switch, and establishes the frequency of vibration of the switch in air, DFF, combining the measurements of DFF and WFF to determine the density of the medium, establishing a relationship between density and switching frequency at a given point for the switch; identifying a density of the medium within the relationship; and establishing a switching point of the switch in the medium. In view of the embodiments, the error of the switching point is greatly reduced, but the fluid density is established by curve polynomial fitting, the calculation process is complex, the liquid environment is not corrected, the reliability of the generated experimental data is uncertain, the upper and lower limits of the product density corresponding to the tuning fork frequency are large, the density of the approximate product cannot be detected and distinguished, and the control of different liquid interface liquid levels is even impossible.
Disclosure of Invention
The invention provides a tuning fork liquid level switch and a liquid level detection method thereof, aiming at the technical problems that although a tuning fork switch in the prior art can detect the liquid density, the precision is low, the density of approximate liquid substances cannot be detected, and the determination of a mixed interface in continuous sequential oil transportation cannot be carried out, by controlling the liquid circulation path and utilizing the temperature environment slightly higher than the external temperature, the accurate judgment of the liquid density at the specific temperature and the specific mixed liquid environment is realized, thereby realizing the separation of the density of the two liquids, solving the problem that the prior tuning fork liquid level switch can only carry out single calibration detection on a single liquid, or the condition that can only detect to single liquid level for mixed infusion in-process, mixed oil interface can be judged, thereby realize using tuning fork liquid level switch the mixed oil transportation's of many oils technical field.
Specifically, the invention provides a tuning fork liquid level switch, which comprises a temperature control system and a tuning fork switch, wherein the temperature control system comprises a first heating structure and a temperature detection structure; and a second heating structure is arranged on the tuning fork switch.
In the invention, the second heating structure comprises a heating rod and a heating gap; a platinum resistance heating rod is arranged between the two tuning fork heads of the tuning fork switch; the tuning fork head comprises a square block and a diamond block, a heating gap is arranged in the square block, a heating film is arranged in the heating gap, insulating layers are arranged on two sides of the heating film, a heating wire is arranged in the middle of the heating film, a temperature measuring wire is arranged on one side of the heating wire, and a vibrating beam is arranged on the outer side of the diamond block.
In the invention, the first heating structure is cylindrical, and a heating wire and a temperature measuring wire are arranged in the cylinder.
In the invention, the temperature detection structure comprises a first thermometer and a second thermometer, wherein the first thermometer and the second thermometer are arranged on two sides of the tuning fork switch and have the same distance from the tuning fork switch.
In the invention, the tuning fork liquid level switch also comprises an arc-shaped oil conveying pipeline, and a temperature control system and the tuning fork switch are arranged on the arc-shaped oil conveying pipeline.
In the invention, two ends of the arc-shaped oil conveying pipeline are provided with connecting flanges, and the middle part of the inner arc side of the arc-shaped oil conveying pipeline is provided with a tuning fork switch.
In the invention, the length of the arc oil pipeline is 45cm-60cm, the diameter is 10cm-30cm, the arc angle of the arc oil pipeline is 15-30 degrees, and the length of the first heating structure is 1/3-3/8 of the length of the arc oil pipeline.
The invention also provides a liquid level detection method of the tuning fork liquid level switch, which comprises the following steps:
(1) the first heating structure is installed at one end of the arc-shaped oil conveying pipeline, a tuning fork switch with a second heating structure is installed on the inner arc side of the arc-shaped oil conveying pipeline, a first thermometer and a second thermometer are installed on the outer arc side, opposite to the tuning fork switch, of the arc-shaped oil conveying pipeline in a punching mode, the first thermometer is arranged between the first heating structure and the tuning fork switch, the distance between the second thermometer and the tuning fork switch is the same as the distance between the first thermometer and the second thermometer and the distance between the first thermometer and the tuning fork switch, the temperature measuring heads of the first thermometer and the second thermometer are located at the pipe diameter 1/3 of the arc-shaped oil conveying pipeline, and the front end of the tuning fork switch is located at the pipe diameter 1/4 of the arc-shaped oil conveying pipeline.
(2) And (3) carrying out calibration test on the tuning fork liquid level switch assembled in the step (1) to obtain vibration frequencies corresponding to kerosene, gasoline and diesel respectively when the tuning fork liquid level switch is at the temperature of 42 ℃.
(3) The arc-shaped oil conveying pipeline is arranged in the middle of the oil conveying pipeline by using the flange.
(4) The temperature of the first heating structure is controlled to be 42-45 ℃, and the temperature difference between the first thermometer and the second thermometer is not more than 1 ℃.
(5) And starting the second heating structure, and controlling the tuning fork head temperature of the tuning fork switch to be 42 ℃.
(6) And detecting the comparison between the vibration frequency of the tuning fork switch and the calibration frequency, and determining that the liquid in the pipeline is the oil product with the density closest to the calibrated oil product.
In the invention, the second heating structure comprises a heating rod and a heating film in a heating gap, the heating film is started to be heated to 42 ℃ when the second heating structure is started, then the heating rod is controlled to 42-49 ℃, and when the vibration frequencies of kerosene, gasoline and diesel oil are close to the influence region during calibration, the heating rod is adjusted to 42-49 ℃ to obtain the optimal temperature.
In the invention, when the tuning fork liquid level switch is used in an environment with the temperature lower than-15 ℃ in winter, an external wrapping heat-insulating structure is required for heat insulation.
The invention has the beneficial effects that:
according to the tuning fork liquid level switch and the liquid level detection method using the tuning fork liquid level switch, provided by the invention, the upper limit and the lower limit of the density of liquid detected by the tuning fork liquid level switch are reduced, different liquid densities can be accurately detected, and therefore the application of the tuning fork liquid level switch in detecting a mixed oil transportation product interface is solved. Compared with the prior art that temperature compensation or temperature control is only performed on the tuning fork, the oil delivery pipe with the specific angle and the external heating control method are utilized to control the temperature of the transmission medium, particularly the temperature of the medium at the head of the tuning fork, within a small fluctuation range, so that the relation between the oil density and vibration is utilized when oil is delivered under specific pressure, and the oil density of the test point is accurately obtained, so that the oil delivery direction can be controlled.
Drawings
FIG. 1 is a schematic layout of the apparatus of the present invention.
FIG. 2 is a schematic diagram of a tuning fork switch according to the present invention.
Fig. 3 is a tuning fork according to the present invention.
Fig. 4 is a tuning fork internal heating wire of the present invention.
In FIGS. 1-4, 1-arc oil pipeline, 2-tuning fork switch, 3-flange, 4-first heating structure, 5-first thermometer, 6-second thermometer, 7-heating wire, 8-heating film, 9-temperature measuring wire, 10-square block, 11-vibrating beam, 12-heating rod, 13-fixing groove, 14-heating gap.
Detailed Description
The following description of the embodiments of the present invention will be made in further detail with reference to the accompanying fig. 1 to 4 and examples, but the method of the present invention is not limited to the following examples.
The first embodiment is as follows: equipment layout of tuning fork liquid level switch
The method is characterized in that an arc-shaped oil conveying pipeline 1 with the length of 45-60 cm, the diameter of 10-30 cm and the arc angle of 15-30 degrees is arranged on the oil conveying pipeline, two ends of the arc-shaped oil conveying pipeline 1 are connected into the original oil conveying pipeline through flanges 3, one end of an oil inlet of the arc-shaped oil conveying pipeline 1 is wrapped with a first heating structure 4 with the length of 1/3-3/8, and the temperature of a detection point is accurately controlled through the size because the ranges of the angle, the length and the diameter have important influence on the transmission of the temperature of the pipe wall to the center of the pipeline.
The first heating structure 4 of this embodiment employs a heating ring with a heating wire and a temperature measuring wire inside.
The tuning fork switch 2 of the present embodiment has a second heating structure, which includes a heating rod 12 and a heating slit 14; a platinum resistance heating rod 12 is arranged between the two tuning fork heads of the tuning fork switch 2; the tuning fork head comprises a square block 10 and a diamond block, a heating gap 14 is arranged in the square block 10, a heating film 8 is arranged in the heating gap 14, the two sides of the heating film 8 are insulating layers, a heating wire 7 is arranged in the middle of the heating film 8, a temperature measuring line 9 is arranged on one side of the heating wire 7, the heating temperature of the square block 10 is conveniently and accurately controlled, a fixing groove 13 is arranged on the upper portion of the square block 10 of the tuning fork head, the fixing groove 13 is clamped into a vibration source output end, the tuning fork head is made of stainless steel, heat transfer is good, and the overall temperature of the tuning fork is controllable.
The vibration beam 11 is arranged on the outer side of the diamond block, the frequency consistency of the tuning forks is adjusted through the length and the length of the vibration beam 11, after the tuning forks are prepared, the tuning forks are in a resonant frequency in a dry environment, and the size of the vibration beam 11 is continuously adjusted by laser so that the resonant frequency of the tuning fork dry environment is adjusted consistently.
The second embodiment is as follows: liquid level detection method of tuning fork liquid level switch
The liquid level detection method by using the tuning fork liquid level switch of the first embodiment comprises the following steps:
(1) and (3) carrying out calibration test on the installed tuning fork liquid level switch, starting a second heating structure during calibration, starting a heating film 8 to heat to 42 ℃, controlling a heating rod 12 to heat to 42-49 ℃, and adjusting the heating rod 12 to obtain the optimal temperature within 42-49 ℃ and recording when the vibration frequency of kerosene, gasoline and diesel oil approaches to the influence region during calibration, so as to obtain the vibration frequency corresponding to the kerosene, the gasoline and the diesel oil respectively when the tuning fork liquid level switch is at the temperature of 42 ℃.
(2) The temperature of the first heating structure 4 is controlled to be 42-45 ℃, and the temperature difference between the first thermometer 5 and the second thermometer 6 is not more than 1 ℃.
(3) Starting a second heating structure, and controlling the tuning fork head temperature of the tuning fork switch 2 to be 42 ℃;
(4) and detecting the comparison between the vibration frequency of the tuning fork switch 2 and the calibration frequency, and determining that the liquid in the pipeline is the oil product with the density closest to the calibrated oil product.
When the tuning fork liquid level switch is used in an environment with the temperature lower than-15 ℃ in winter, an external wrapping heat-insulating structure is required to be adopted for heat insulation.
Example three: comparative experiment
The relationship between the tuning fork switching frequency and the medium density is established when the tuning fork is completely immersed in the medium, and the relationship between the tuning fork liquid level switch size and the density test precision can be obtained by utilizing the known density and different times of the medium, as shown in the following table:
when the outer wall of the oil pipeline is heated, the temperature of the inner wall and the temperature of the outer wall of the metal pipe can be approximately equal after a long time, but the temperature is transmitted to the center of the oil product, the oil product flows, the oil product needs to be heated continuously, the length of the heating section is limited, if the heat transmission is unreasonable, the temperature of the oil product at a detection point does not reach the corresponding test temperature, and the test density is difficult to avoid the influence of the temperature of the oil product. Through a plurality of tests of different sizes and installation methods, the arc-shaped oil conveying pipeline with the corresponding angle has directional flow guide, the corresponding length and pipe diameter also have important influence on the transmission direction, and accurate measurement can be obtained only if the three are closely matched to form a specific heating point oil flow through the tuning fork.
Of course, the applicant also finds that the pipeline conveying pressure has great influence on the result in experiments, but the pressure can be accurately controlled through the input end, and the pipeline pressure is stable in the oil conveying process, so that the influence is integrally controllable.
At normal temperature, the density difference between kerosene and diesel oil is 50kg/m 3 About, the difference between gasoline and kerosene is only 90kg/m 3 About, the difference between the gasoline density and the diesel density is not more than 160kg/m when the difference is the maximum 3 Left and right. Although the density difference is properly enlarged after the temperature rises, the oil product is originally a mixture, the density of the oil product is a range value, and the density of the oil product is different even if the oil product is diesel oil, so that the tuning fork switch density is required to be more accurate, and the problem that the tuning fork switch cannot be identified due to small environmental poking is caused. Therefore, the invention raises the detection temperature to be higher than the highest ambient temperature, obtains the optimal size parameter of the oil pipe from the external temperature to the center through creative experiments, and ensures the environmental stability of the test points, thereby being capable of accurately distinguishing oil products.
As described above, the present invention can be preferably implemented, and the above-mentioned embodiments only describe the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope determined by the present invention.
Claims (10)
1. The tuning fork liquid level switch is characterized by comprising a temperature control system and a tuning fork switch, wherein the temperature control system comprises a first heating structure and a temperature detection structure; and a second heating structure is arranged on the tuning fork switch.
2. The tuning fork level switch of claim 1, wherein the second heating structure comprises a heating rod and a heating slit; a platinum resistance heating rod is arranged between the two tuning fork heads of the tuning fork switch; the tuning fork head comprises a square block and a diamond block, a heating gap is arranged in the square block, a heating film is arranged in the heating gap, insulating layers are arranged on two sides of the heating film, a heating wire is arranged in the middle of the heating film, a temperature measuring wire is arranged on one side of the heating wire, and a vibrating beam is arranged on the outer side of the diamond block.
3. The tuning fork level switch of claim 1, wherein the first heating structure is cylindrical, and a heating wire and a temperature measuring wire are arranged in the cylinder.
4. The tuning fork level switch of claim 1, wherein the temperature detecting structure comprises a first thermometer and a second thermometer, the first thermometer and the second thermometer being disposed on both sides of the tuning fork switch at the same distance from the tuning fork switch.
5. The tuning fork liquid level switch of claim 1, wherein the tuning fork liquid level switch further comprises an arc-shaped oil conveying pipeline, and the arc-shaped oil conveying pipeline is provided with a temperature control system and the tuning fork switch.
6. The tuning fork liquid level switch of claim 5, wherein the two ends of the arc-shaped oil conveying pipeline are provided with connecting flanges, and the middle part of the inner arc side of the arc-shaped oil conveying pipeline is provided with the tuning fork switch.
7. The tuning fork liquid level switch of claim 6, wherein the arc-shaped oil pipeline has a length of 45cm to 60cm and a diameter of 10cm to 30cm, an arc angle of the arc-shaped oil pipeline is 15 ° to 30 °, and the length of the first heating structure is 1/3 to 3/8 of the length of the arc-shaped oil pipeline.
8. The method for detecting the liquid level by adopting the tuning fork liquid level switch as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
(1) a first heating structure is installed at one end of the arc-shaped oil conveying pipeline, a tuning fork switch provided with a second heating structure is installed on the inner arc side of the arc-shaped oil conveying pipeline, a first thermometer and a second thermometer are installed on the outer arc side of the arc-shaped oil conveying pipeline opposite to the tuning fork switch in a perforated mode, the first thermometer is arranged between the first heating structure and the tuning fork switch, the distance from the second thermometer to the tuning fork switch is the same as the distance from the first thermometer to the tuning fork switch, the temperature measuring heads of the first thermometer and the second thermometer are located at the pipe diameter 1/3 of the arc-shaped oil conveying pipeline, and the front end of the tuning fork switch is located at the pipe diameter 1/4 of the arc-shaped oil conveying pipeline;
(2) performing calibration test on the tuning fork liquid level switch assembled in the step (1) to obtain vibration frequencies corresponding to kerosene, gasoline and diesel respectively when the tuning fork liquid level switch is at the temperature of 42 ℃;
(3) installing an arc-shaped oil conveying pipeline in the middle of the oil conveying pipeline by using a flange;
(4) controlling the temperature of the first heating structure to be 42-45 ℃, and controlling the temperature difference between the first thermometer and the second thermometer not to exceed 1 ℃;
(5) starting a second heating structure, and controlling the temperature of a tuning fork head of the tuning fork switch to be 42 ℃;
(6) and detecting the comparison between the vibration frequency of the tuning fork switch and the calibration frequency, and determining that the liquid in the pipeline is the oil product with the density closest to the calibrated oil product.
9. The method for detecting the liquid level by using the tuning fork liquid level switch as claimed in claim 8, wherein the second heating structure comprises a heating rod and a heating film in a heating gap, the heating film is started to be heated to 42 ℃ when the second heating structure is started, then the heating rod is controlled to 42-49 ℃, and when the vibration frequency of kerosene, gasoline and diesel oil is close to an influence region during calibration, the heating rod is adjusted to the optimal temperature within 42-49 ℃.
10. The method for detecting liquid level by using a tuning fork liquid level switch as claimed in claim 9, wherein the tuning fork liquid level switch is required to be insulated by an external wrapping insulation structure when used in an environment of lower than-15 ℃ in winter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210530165.4A CN114942055A (en) | 2022-05-16 | 2022-05-16 | Tuning fork liquid level switch and liquid level detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210530165.4A CN114942055A (en) | 2022-05-16 | 2022-05-16 | Tuning fork liquid level switch and liquid level detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114942055A true CN114942055A (en) | 2022-08-26 |
Family
ID=82906786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210530165.4A Pending CN114942055A (en) | 2022-05-16 | 2022-05-16 | Tuning fork liquid level switch and liquid level detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114942055A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1194726A (en) * | 1997-09-19 | 1999-04-09 | Riken Corp | Tuning fork-type piezoelectric vibrator |
| CN1493878A (en) * | 2003-09-24 | 2004-05-05 | 王广涛 | New method of liquid state environment different medium interface measurement |
| CN203605997U (en) * | 2013-12-05 | 2014-05-21 | 湖北弘仪电子科技股份有限公司 | Novel tuning fork liquid level switching device |
| US20190063216A1 (en) * | 2017-08-23 | 2019-02-28 | Saudi Arabian Oil Company | Multiphase flow meter with tuning fork |
| CN109642815A (en) * | 2016-08-03 | 2019-04-16 | 罗斯蒙特测量有限公司 | Vibrate Fork LIquid Level Switch or about vibration Fork LIquid Level Switch improvement |
| DE102018207178A1 (en) * | 2018-05-08 | 2019-11-14 | Vega Grieshaber Kg | Vibration level switch with integrated tuning fork check |
| CN113155238A (en) * | 2021-04-30 | 2021-07-23 | 国家石油天然气管网集团有限公司华南分公司 | Oil interface intelligent detection device |
| CN214951667U (en) * | 2021-07-14 | 2021-11-30 | 广州港发石油化工码头有限公司 | Wharf liquid level alarm device |
-
2022
- 2022-05-16 CN CN202210530165.4A patent/CN114942055A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1194726A (en) * | 1997-09-19 | 1999-04-09 | Riken Corp | Tuning fork-type piezoelectric vibrator |
| CN1493878A (en) * | 2003-09-24 | 2004-05-05 | 王广涛 | New method of liquid state environment different medium interface measurement |
| CN203605997U (en) * | 2013-12-05 | 2014-05-21 | 湖北弘仪电子科技股份有限公司 | Novel tuning fork liquid level switching device |
| CN109642815A (en) * | 2016-08-03 | 2019-04-16 | 罗斯蒙特测量有限公司 | Vibrate Fork LIquid Level Switch or about vibration Fork LIquid Level Switch improvement |
| US20190063216A1 (en) * | 2017-08-23 | 2019-02-28 | Saudi Arabian Oil Company | Multiphase flow meter with tuning fork |
| DE102018207178A1 (en) * | 2018-05-08 | 2019-11-14 | Vega Grieshaber Kg | Vibration level switch with integrated tuning fork check |
| CN113155238A (en) * | 2021-04-30 | 2021-07-23 | 国家石油天然气管网集团有限公司华南分公司 | Oil interface intelligent detection device |
| CN214951667U (en) * | 2021-07-14 | 2021-11-30 | 广州港发石油化工码头有限公司 | Wharf liquid level alarm device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2759778C1 (en) | Non-intrusive diagnostics of pipeline walls | |
| US6182504B1 (en) | Emulsion composition monitor | |
| RU2499229C2 (en) | Method and apparatus for determining composition and flow rate of wet gas | |
| US9151838B2 (en) | Ceramic probe rod support assembly | |
| US2279043A (en) | Fluid level device | |
| US7610818B2 (en) | Flow meter for bitumen froth pipelines | |
| GB2265987A (en) | Apparatus and method for measuring viscosities of liquids. | |
| CN101398369A (en) | Device and method for monitoring surface corrosion | |
| KR20040015724A (en) | Flowmeter proving device and method | |
| JP4639160B2 (en) | Capillary bridge viscometer and method for equilibrating the bridge | |
| US2654067A (en) | Cut point determination in pipe-line batching | |
| US6732570B2 (en) | Method and apparatus for measuring a fluid characteristic | |
| JP2019528445A (en) | Conductivity sensor with void correction | |
| WO2001020282A1 (en) | Process flow plate with temperature measurement feature | |
| EP0576260B1 (en) | Method and apparatus for measuring fluid thermal conductivity | |
| JPS62500330A (en) | Aquarium liquid temperature control device | |
| US10330663B2 (en) | System and method for measuring separation rate of water from water-in-crude oil emulsions | |
| US9927341B2 (en) | Vibrating member for a vibrating densitometer | |
| CN114942055A (en) | Tuning fork liquid level switch and liquid level detection method | |
| JP7448536B2 (en) | On-site ultrasonic flow meter verification | |
| MX2015003335A (en) | Mobility detection for edge applications in wireless communication networks. | |
| Makeev et al. | Microwave measurement of water content in flowing crude oil | |
| US11002720B2 (en) | Gas energy measurement method and related apparatus | |
| US5386718A (en) | Method for fluid analysis | |
| US20090024327A1 (en) | System and method for measuring flow in a pipeline |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |