CN214096276U - Liquid level measurement error correction device under marine environment - Google Patents
Liquid level measurement error correction device under marine environment Download PDFInfo
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- CN214096276U CN214096276U CN202023045417.XU CN202023045417U CN214096276U CN 214096276 U CN214096276 U CN 214096276U CN 202023045417 U CN202023045417 U CN 202023045417U CN 214096276 U CN214096276 U CN 214096276U
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Abstract
The utility model discloses a liquid level measurement error correcting device under marine environment, which comprises a water collecting container, a pressure guide pipe, a differential pressure transmitter and a data acquisition and processing device; the pressure guide pipe is connected with the water collecting container; the differential pressure transmitter is positioned right below the water collecting container, the high pressure side of the differential pressure transmitter is connected with the pressure guide pipe, and the low pressure side of the differential pressure transmitter is connected with the atmosphere; the data acquisition and processing device is connected with the differential pressure transmitter, acquires the measurement signal of the differential pressure transmitter and calculates the liquid level correction coefficient. Compared with the prior art, the utility model discloses a differential pressure transmitter can adopt same data acquisition system, same fastener to carry out data acquisition and processing with the level meter measuring signal of the container under test, consequently can guarantee correction signal and level measurement signal dynamic response's uniformity, and data transmission delay leads to the inconsistent problem of slope signal and level measurement signal synchronism when effectively having solved the current clinometer of adoption, not only can revise the inclination and change, can also revise the acceleration of gravity change simultaneously.
Description
Technical Field
The utility model belongs to the level measurement field under the marine environment, more specifically say, the utility model relates to a level measurement error correcting unit under marine environment.
Background
In the marine environment, the ship or the offshore platform inclines and swings, so that the liquid level measurement in the ship or the offshore platform is difficult for a long time, and great troubles are brought to the liquid level monitoring and the process control.
In order to solve the measurement error of the measured container in an inclined state in the process of inclination and swing, one method adopts an inclinometer to measure the inclination state of a ship body in real time for correcting a liquid level meter. The principle of the method is feasible, but the following problems exist in practical use:
1) there is a problem of the inclinometer and the gauge signals being out of sync. The measurement signal of the existing inclinometer needs to be subjected to complex calculation processing, and then the ship body inclination signal is sent to the liquid level meter data acquisition unit in a communication mode, so that the acquisition speed of the existing inclinometer is much slower than that of the liquid level meter signal, and meanwhile, the acquisition cycle of the liquid level meter data acquisition unit is not equal to 150-500 ms, so that the synchronization of the liquid level meter data acquisition unit and the liquid level meter data acquisition unit is difficult to ensure, the measurement effect is poor, and the correction error is large;
2) the existing inclinometer is expensive and complex in system, the output signals are signals of rolling, pitching, rolling and pitching, a control system is required to identify and judge whether a ship is in a rolling state or an inclined state at present so as to select whether the liquid level correction is to adopt a rocking angle or an inclination angle, and the processing is complex; in addition, the existing inclinometer does not have a vertical acceleration signal, and does not meet the signal correction requirement of the pressure type liquid level meter, which is also a factor that the measurement precision of the current pressure type liquid level meter in a ship is not high and the application is not wide.
In view of the above, it is necessary to provide a device for correcting the error of the liquid level measurement in the marine environment, which can solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the device for correcting the liquid level measurement error in the marine environment is simple, reliable and high in precision, solves the problem of signal correction of the pressure type liquid level meter, and improves the liquid level measurement precision.
In order to realize the purpose of the utility model, the utility model provides a liquid level measurement error correction device under the marine environment, which comprises a water collection container, a pressure guide pipe, a differential pressure transmitter and a data acquisition and processing device; the pressure guide pipe is connected with the water collecting container; the differential pressure transmitter is positioned right below the water collecting container, the high pressure side of the differential pressure transmitter is connected with the pressure guide pipe, and the low pressure side of the differential pressure transmitter is connected with the atmosphere; the data acquisition and processing device is connected with the differential pressure transmitter, acquires the measurement signal of the differential pressure transmitter and calculates the liquid level correction coefficient.
As the utility model discloses level measurement error correcting unit's improvement under the marine environment, the computational formula of liquid level correction coefficient k is k for P/P ', wherein, P is the pressure measurement value of difference pressure transmitter under the quiescent condition, and P ' takes place to incline for the hull and sways or slosh the pressure measurement value of difference pressure transmitter.
As the utility model discloses level measurement error correcting unit's an improvement under the marine environment, data acquisition and processing device that data acquisition and processing device and the level meter measuring signal of being surveyed the container adopted is same device.
As the utility model discloses level measurement error correcting unit's an improvement under the marine environment, the central point of water collection container and differential pressure transmitter's central point are on a vertical line.
As the utility model discloses level measurement error correcting unit's an improvement under the marine environment, differential pressure transmitter is connected with the atmosphere through a decurrent pipe.
As the utility model discloses the improvement of liquid level measurement error correcting unit under the marine environment, the cross-sectional area of water collection container is the same with the cross-sectional area of connecting pipe.
As an improvement of the liquid level measurement error correction device in the marine environment, the cross section of the pressure pipe and the water collecting container is circular, and the size is selected from DN20 to DN 50.
As the utility model discloses improvement of liquid level measurement error correcting unit under the marine environment, the water collecting container is the not full water state, reserves the free space that is used for absorbing the hydrothermal expend with cold and contract with cold in connecting pipe and the water collecting container.
As the utility model discloses level measurement error correcting unit's an improvement under the marine environment, be provided with the filter screen that the multilayer is used for restraining liquid and rocks in the water collecting container.
As an improvement of the utility model discloses liquid level measurement error correcting unit under the marine environment, the top of water collecting container is provided with the moisturizing mouth of a river of taking the end cap.
Compared with the prior art, the utility model discloses liquid level measurement error correcting unit's differential pressure transmitter can adopt same data acquisition system with the level meter measuring signal of the container under test under the marine environment, same fastener carries out data acquisition and processing, consequently can guarantee correction signal and liquid level measurement signal dynamic response's uniformity, effectively solved when adopting current inclinometer data transmission delay lead to the inconsistent problem of slope signal and liquid level measurement signal synchronism, not only can revise the inclination and change, can also revise the gravity acceleration change simultaneously.
Drawings
The following will explain in detail the liquid level measurement error correction device under the marine environment of the present invention with reference to the attached drawings and the detailed description.
Fig. 1 is the utility model discloses level measurement error correcting unit's under the marine environment structural schematic diagram.
Detailed Description
In order to make the purpose, technical scheme and beneficial technical effect of the utility model clearer, the following combines the drawings and the detailed description to go forward the further detailed description of the utility model. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and not limitation.
Referring to fig. 1, the device for correcting the liquid level measurement error in the marine environment of the present invention includes a water collecting container 10, a pressure pipe 11, a differential pressure transmitter 13 and a data collecting and processing device 14. Wherein, the pressure guide pipe 11 is connected with the water collecting container 10; differential pressure transmitter 13 is located right below water collection container 10, and the central point of water collection container 10 and the central point of differential pressure transmitter 13 are ensured to be on a vertical line. The high pressure side of the differential pressure transmitter 13 is connected with the pressure guide pipe 11, and the low pressure side is connected with the atmosphere; the data acquisition processing device 14 is connected to the differential pressure transmitter 13, and acquires a measurement signal of the differential pressure transmitter 13 and calculates a liquid level correction coefficient.
The top of the water collecting container 10 is provided with a water replenishing opening with a plug. The pressure pipe 11 is filled with water to ensure that no air bubbles are present between the pressure pipe 11 and the differential pressure transmitter 13. The low pressure side of differential pressure transmitter 13 is connected to atmosphere by a down conduit 130.
The utility model discloses liquid level measurement error correcting unit's measurement principle under the marine environment does:
in a static state, a pressure measurement value P corresponding to a measurement signal of differential pressure transmitter 13 is: p is rho gh, rho is the density of the water in the water collection container 10 and the pressure guide pipe 11, g is the gravity acceleration, and h is the total height of the water in the water collection container 10 and the pressure guide pipe 11;
when the ship body is inclined, rocked or shaken, the pressure measurement value P' corresponding to the measurement signal of the differential pressure transmitter 13 is: p ' ═ ρ gg ' hcos α, α is the inclination angle of the hull, and g ' is the variation of the gravitational acceleration caused by the shaking of the hull;
from this, the liquid level correction coefficient k is: k is 1/cos α g 'is P/P'.
The data acquisition and processing device 14 stores a pressure measurement value P in a stationary state, and the liquid level correction coefficient k can be calculated by using a formula k of P/P 'by converting a measurement signal of the differential pressure transmitter 13 into the pressure measurement value P'.
The utility model discloses choose for use differential pressure transmitter 13 to measure P, P's reason because boats and ships are at marine navigation, and different positions atmospheric pressure is different, and differential pressure transmitter can prevent that atmospheric pressure's change from leading to measuring error.
The utility model discloses can adopt the level gauge measuring signal's of the container under test data acquisition system, the fastener carries out data acquisition to differential pressure transmitter 13's measuring signal and handles, promptly the utility model discloses can adopt current boats and ships or offshore platform's liquid level measurement system's data acquisition processing apparatus to conduct the utility model discloses a data acquisition processing apparatus 14, as long as save the pressure measurement value P and the calculation formula of liquid level correction coefficient k under the differential pressure transmitter 13 quiescent condition in boats and ships or offshore platform's data acquisition processing apparatus to be connected data acquisition processing apparatus with the differential pressure transmitter 13 of this application, can provide the error correction signal of a standard by differential pressure transmitter 13 for boats and ships liquid level measurement system, and then calculate out liquid level correction coefficient k.
According to the above description, the utility model discloses a current boats and ships or offshore platform's liquid level measurement system's data acquisition processing apparatus is data acquisition processing apparatus 14, the correction signal of liquid level correction coefficient k adopts same data acquisition system with the liquid level meter measurement signal of the container under test, same fastener carries out data acquisition and processing, consequently, liquid level correction signal and liquid level measurement signal dynamic response's uniformity can be guaranteed, the problem that data transmission delay leads to slope signal and liquid level measurement signal synchronism nonconformity when effectively having solved the current clinometer of adoption, the precision of liquid level correction has greatly been improved, the hull slope has been improved and has been swayd in-process liquid level measurement's reliability and stability.
Because the utility model discloses there is the change in the ambient temperature that liquid level measurement error correcting unit located under the marine environment, according to the utility model discloses a measurement principle, ambient temperature's change can arouse the density change of water, and consequently differential pressure transmitter 13's behind the temperature change pressure measurement value also can change, and the computational formula of pressure measurement value variation delta P is:
in the above equation, S1 is the cross-sectional area of the pressure pipe 11, h1 is the height of the pressure pipe 11, S2 is the cross-sectional area of the water collection container 10, ρ 1 is the density of water at the initial time, and ρ 2 is the density of water after temperature change.
As can be seen from the above formula, when the temperature increases, the pressure decreases, and the larger the difference between the cross-sectional area S1 of the pressure guiding pipe 11 and the cross-sectional area S2 of the water collection container 10, the larger the amount of change Δ P in the pressure measurement value, and Δ P is 0 only when S1 is equal to S2.
Therefore, in order to avoid measurement errors caused by the difference between the cross-sectional area of the water collecting container 10 and the cross-sectional area of the pressure pipe 11, the present invention requires that the cross-sectional area S2 of the water collecting container 10 is the same as the cross-sectional area S1 of the pressure pipe 11, for example, when both cross-sections are circular, the diameters of both are required to be the same. In order to facilitate the installation of the pressure pipe 11 and prevent the water in the pressure pipe 11 from evaporating, the dimensions of the pressure pipe 11 and the water collecting container 10 are preferably selected from the range of DN20 to DN50, and are reasonable.
It is easily understood because the utility model discloses there is the change in the ambient temperature that liquid level measurement error correcting unit located under the marine environment, needs to reserve certain space in the container 10 that catchments for absorb the change in volume that the expend with heat and contract with cold of connecting pipe 11 and the container 10 water-logging arouses. Considering the range of variation of the ambient temperature from 0 ℃ to 99 ℃, the water in the water collection container 10 should not overflow, and the density variation is calculated to result in the variation Δ h of the liquid level in the water collection container 10 as:
where ρ 1 is 0.999, ρ 2 is 0.959, and h is the total height of the water in the water collecting container 10 and the pressure pipe 11, it can be calculated that the water collecting container 10 needs to reserve a free space which occupies about 5% of the total height of the water in the water collecting container 10 and the pressure pipe 11.
Because water collecting container 10 belongs to not full water state, for preventing that inside liquid from shaking along with the hull and arousing new measuring error, the utility model discloses set up the multilayer in water collecting container 10 and be used for restraining the filter screen that liquid rocked.
Compared with the prior art, the utility model discloses there are following advantage in level measurement error correcting unit under the marine environment at least:
1) the correction signal of the liquid level correction coefficient k and the liquid level measurement signal of the measured container adopt the same data acquisition system and the same clamping piece for data acquisition and processing, so that the consistency of dynamic response of the correction signal and the liquid level measurement signal can be ensured, and the problem of inconsistent synchronism of the inclination signal and the liquid level measurement signal caused by data transmission delay when the existing inclinometer is adopted is effectively solved;
2) not only can the inclination angle change be corrected, but also the gravity acceleration change can be corrected at the same time;
3) p, P' is measured by differential pressure transmitter 13 to ensure that the measurement result is not affected by changes in atmospheric pressure;
4) the cross-sectional area S2 of the water collection container 10 is the same as the cross-sectional area S1 of the pressure guide pipe 11, so that the measurement result is not influenced by the change of the ambient temperature;
5) the principle is simple, and the liquid level measuring signal are integrated in the same measuring system and are easy to realize;
6) simple structure and low installation requirement.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A liquid level measurement error correction device in marine environment is characterized by comprising a water collecting container, a pressure guide pipe, a differential pressure transmitter and a data acquisition and processing device; the pressure guide pipe is connected with the water collecting container; the differential pressure transmitter is positioned right below the water collecting container, the high pressure side of the differential pressure transmitter is connected with the pressure guide pipe, and the low pressure side of the differential pressure transmitter is connected with the atmosphere; the data acquisition and processing device is connected with the differential pressure transmitter, acquires the measurement signal of the differential pressure transmitter and calculates the liquid level correction coefficient.
2. The marine environment liquid level measurement error correction device according to claim 1, wherein the calculation formula of the liquid level correction coefficient k is k-P/P ', where P is a pressure measurement value of the differential pressure transmitter in a static state, and P' is a pressure measurement value of the differential pressure transmitter when the ship body is inclined and swung or shaken.
3. The apparatus according to claim 1, wherein the data acquisition and processing device is the same as the data acquisition and processing device used for measuring signals of the level gauge of the container under test.
4. The apparatus of claim 1, wherein the center point of the water collection container is perpendicular to the center point of the differential pressure transmitter.
5. The apparatus of claim 1, wherein the differential pressure transmitter is connected to the atmosphere via a downward conduit.
6. The device for correcting the error of the liquid level measurement in the marine environment according to claim 1, wherein the cross-sectional area of the water collecting container is the same as that of the pressure guiding pipe.
7. The device for correcting the error of the liquid level measurement in the marine environment according to claim 6, wherein the cross section of the pressure conduction pipe and the cross section of the water collecting container are both circular, and the size of the pressure conduction pipe and the size of the water collecting container are selected from DN20 to DN 50.
8. The device for correcting the liquid level measurement error in the marine environment according to claim 1, wherein the water collection container is in a non-full water state, and a free space for absorbing water thermal expansion and contraction in the pressure guide pipe and the water collection container is reserved.
9. The apparatus according to claim 8, wherein a plurality of layers of screens for suppressing the sloshing of the liquid are disposed in the water collecting container.
10. The device for correcting the error of the liquid level measurement in the marine environment according to claim 1, wherein a water replenishing port with a plug is arranged at the top of the water collecting container.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023045417.XU CN214096276U (en) | 2020-12-17 | 2020-12-17 | Liquid level measurement error correction device under marine environment |
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| CN202023045417.XU CN214096276U (en) | 2020-12-17 | 2020-12-17 | Liquid level measurement error correction device under marine environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116839809B (en) * | 2023-09-04 | 2023-12-05 | 哈尔滨工程大学 | Marine differential pressure principle instrument measurement correction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116839809B (en) * | 2023-09-04 | 2023-12-05 | 哈尔滨工程大学 | Marine differential pressure principle instrument measurement correction method |
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