CN216695959U - On-site correcting device for static pressure method hydrometer - Google Patents
On-site correcting device for static pressure method hydrometer Download PDFInfo
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- CN216695959U CN216695959U CN202220038965.XU CN202220038965U CN216695959U CN 216695959 U CN216695959 U CN 216695959U CN 202220038965 U CN202220038965 U CN 202220038965U CN 216695959 U CN216695959 U CN 216695959U
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Abstract
The utility model belongs to the field of detection equipment, and particularly discloses a field correction device of a static pressure hydrometer, aiming at improving the accuracy of the medium specific gravity measured by the static pressure hydrometer. The field correction device comprises an upper pressure tapping pipe, a lower pressure tapping pipe, a pressure guiding pipe and a differential pressure sensor. The auxiliary static pressure hydrometer is used for indirectly measuring the liquid medium specific gravity by the static pressure method, so that the influence of the pressure taking center distance h on the measured medium specific gravity can be effectively reduced, the field correction of the static pressure hydrometer is realized, and the accurate and reliable medium specific gravity is obtained. Meanwhile, the field correction device is used for assisting in measurement, the manufacturing precision of the upper pressure taking port and the lower pressure taking port can be reduced, and cost saving is facilitated. In addition, the precision of the pressure measuring center distance h has very small influence on the measurement result, so that the inspection in the maintenance process is facilitated, the abnormality of the hydrostatic method densitometer is discovered in time, and the daily maintenance fault treatment is well carried out.
Description
Technical Field
The utility model relates to a correcting device, in particular to a field correcting device of a static pressure hydrometer.
Background
In the process of detecting the specific gravity of a medium in industrial production, in order to realize remote centralized detection, a sensor for indirectly measuring the specific gravity of the liquid medium by using a static pressure method is used, and the sensor is also called a static pressure method specific gravity meter. The operating principle is that static pressure P is rho gh, rho represents density, g represents gravity acceleration, and h represents liquid column height or pressure sampling center distance. The output signal of the static pressure hydrometer is in direct proportion to the differential pressure, and the differential pressure is in direct proportion to the pressure-taking center distance h of the sensor and the specific gravity of the medium; therefore, when the pressure-taking center distance h of the hydrostatic hydrometer is fixed, the differential pressure signal and the specific gravity of the medium form a single corresponding relation, and the pressure-taking center distance h of the hydrostatic hydrometer becomes an instrument coefficient.
However, although the center distance between the upper pressure taking port and the lower pressure taking port manufactured manually is more accurate for small-sized equipment, for large-sized equipment, the accuracy of the obtained data of the pressure taking center distance h is difficult to guarantee and the deviation is often larger no matter the accurate positioning is adopted before the manufacture and the accurate surveying and mapping is carried out after the manufacture; therefore, the accuracy of the specific gravity of the medium measured by a static pressure hydrometer is not high. Meanwhile, in daily use, whether the metering performance of the static pressure hydrometer deviates or not is checked, the static pressure hydrometer can be checked only after being disassembled, and the static pressure hydrometer is installed and recovered after the static pressure hydrometer is checked, so that the whole process is relatively complicated and time-consuming, and the field maintenance is difficult.
SUMMERY OF THE UTILITY MODEL
The utility model provides a field correction device of a static pressure hydrometer, aiming at improving the accuracy of the medium specific gravity measured by the static pressure hydrometer.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the field correction device of the static pressure hydrometer comprises an upper pressure taking pipe, a lower pressure taking pipe, a pressure guiding pipe and a differential pressure sensor;
an upper pressure taking valve is arranged on the upper pressure taking pipe, and an upper pressure taking flange is arranged at the liquid outlet end of the upper pressure taking pipe;
a lower pressure tapping valve is arranged on the lower pressure tapping pipe, and a lower pressure tapping flange is arranged at the liquid outlet end of the lower pressure tapping pipe;
the pressure guiding pipe is in a mu shape and comprises a first pressure guiding pipe section, a second pressure guiding pipe section and a blow-down pipe section with a blow-down valve, wherein the lower ends of the first pressure guiding pipe section and the second pressure guiding pipe section are communicated together;
the first pressure guiding pipe section is respectively communicated with the upper pressure taking pipe and the lower pressure taking pipe, the connection part of the first pressure guiding pipe section and the upper pressure taking pipe is positioned between the upper pressure taking valve and the upper pressure taking flange, and the connection part of the first pressure guiding pipe section and the lower pressure taking pipe is positioned between the lower pressure taking valve and the lower pressure taking flange;
the first pressure guiding pipe section is provided with a correction valve, and the correction valve is positioned on the upper side of the connecting part of the first pressure guiding pipe section and the upper pressure taking pipe;
the differential pressure sensor is respectively communicated with the upper pressure taking flange and the lower pressure taking flange through two sensor capillary tubes.
Furthermore, the upper end of the first pressure guide pipe section and the upper end of the second pressure guide pipe section are both provided with observation containers.
The beneficial effects of the utility model are: the auxiliary static pressure hydrometer is used for indirectly measuring the liquid medium specific gravity by the static pressure method, so that the influence of the pressure taking center distance h on the measured medium specific gravity can be effectively reduced, the field correction of the static pressure hydrometer is realized, and the accurate and reliable medium specific gravity is obtained. Meanwhile, the field correction device is used for assisting in measurement, the manufacturing precision of the upper pressure taking port and the lower pressure taking port can be reduced, and cost saving is facilitated. In addition, the precision of the pressure measuring center distance h has very small influence on the measurement result, so that the inspection in the maintenance process is facilitated, the abnormality of the hydrostatic method densitometer is discovered in time, and the daily maintenance fault treatment is well carried out.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
labeled as: the device comprises an upper pressure taking valve 1, a correction valve 2, a blow-down valve 3, an observation container 4, a pressure guiding pipe 5, an upper pressure taking flange 6, a sensor capillary 7, a differential pressure sensor 8 and an upper pressure taking pipe 9.
Detailed Description
The utility model will be further explained with reference to the drawings.
As shown in figure 1, the field correction device of the static pressure hydrometer comprises an upper pressure tapping pipe 9, a lower pressure tapping pipe, a pressure guiding pipe 5 and a differential pressure sensor 8;
an upper pressure tapping valve 1 is arranged on the upper pressure tapping pipe 9, and an upper pressure tapping flange 6 is arranged at the liquid outlet end of the upper pressure tapping pipe 9;
a lower pressure tapping valve is arranged on the lower pressure tapping pipe, and a lower pressure tapping flange is arranged at the liquid outlet end of the lower pressure tapping pipe;
the pressure guiding pipe 5 is in a mu shape and comprises a first pressure guiding pipe section, a second pressure guiding pipe section and a sewage draining pipe section, wherein the lower ends of the first pressure guiding pipe section and the second pressure guiding pipe section are communicated together, the sewage draining pipe section is provided with a sewage draining valve 3, and the liquid inlet end of the sewage draining pipe section is communicated with the lower end of the first pressure guiding pipe section;
the first pressure guiding pipe section is respectively communicated with the upper pressure taking pipe 9 and the lower pressure taking pipe, the connecting part of the first pressure guiding pipe section and the upper pressure taking pipe 9 is positioned between the upper pressure taking valve 1 and the upper pressure taking flange 6, and the connecting part of the first pressure guiding pipe section and the lower pressure taking pipe is positioned between the lower pressure taking valve and the lower pressure taking flange;
a correction valve 2 is arranged on the first pressure guiding pipe section, and the correction valve 2 is positioned at the upper side of the connection part of the first pressure guiding pipe section and the upper pressure tapping pipe 9;
the differential pressure sensor 8 is respectively communicated with the upper pressure taking flange 6 and the lower pressure taking flange through two sensor capillary tubes 7.
The upper pressure tapping pipe 9 and the lower pressure tapping pipe are respectively used for being connected with an upper pressure tapping port and a lower pressure tapping port of equipment so as to lead out a liquid medium and measure the specific gravity of the liquid medium; the pressure guiding pipe 5 is mainly used for filling standard specific gravity liquid or introducing liquid medium to carry out specific gravity correction and measurement, a blow-down pipe section is mainly used for discharging liquid in the pressure guiding pipe 5, and the blow-down valve 3 is used for controlling liquid discharge of the pressure guiding pipe 5; the differential pressure sensor 8 is mainly used for detecting the differential pressure between the center distances of the upper pressure taking flange 6 and the lower pressure taking flange.
In order to facilitate the injection of the standard specific gravity liquid into the pressure introduction pipe 5 and the observation of the bubbles, as shown in fig. 1, an observation container 4 is disposed at each of the upper end of the first pressure introduction pipe section and the upper end of the second pressure introduction pipe section. The observation vessel 4 is usually made of a transparent material.
The field correction device is used for assisting the hydrometer in carrying out correction of the liquid medium specific gravity measurement by the static pressure method, the liquid inlet end of the upper pressure taking pipe 9 is required to be connected with the upper pressure taking port of the equipment, and the liquid inlet end of the lower pressure taking pipe is required to be connected with the lower pressure taking port of the equipment; after the device is installed in place, the device is corrected on site, and the instrument coefficient of the differential pressure sensor 8 is measured by using standard specific gravity liquid for correction. The specific gravity measurement process is as follows:
the first step, close the upper pressure-taking valve 1 and the lower pressure-taking valve, open the correcting valve 2 and the blowoff valve 3, inject the standard specific gravity liquid from the observation container 4, wash the wall of the on-the-spot correcting device, then close the blowoff valve 3, let the pressure-leading pipe 5 and the observation container 4 be full of the standard specific gravity liquid;
secondly, tapping the pressure guide pipe 5 to passively discharge bubbles remained in the liquid in the pipeline, checking the bubble discharge condition through the observation container 4, and simultaneously observing the fluctuation condition of the indication value detected by the differential pressure sensor 8; when the indication value of the differential pressure sensor 8 is stabilized, the output value P at that time is recorded1；
Thirdly, opening a blowdown valve 3, closing a correction valve 2, opening an upper pressure taking valve 1 and a lower pressure taking valve, recording the instrument coefficient of a differential pressure sensor 8, and then putting the pressure sensors into use, wherein the specific gravity of the medium can be measured according to the following specific gravity measurement formula; the specific gravity measurement formula is as follows:
in the above formula: rhoMeasuringIndicating the specific gravity of the detected medium;
PmeasuringRepresenting the real-time static pressure output value of the differential pressure sensor 8;
P1expressing the static pressure output value of the standard specific gravity liquid in the second step;
ρsign boardAnd the known specific gravity value of the standard specific gravity liquid in the second step is shown.
According to the process, the field correction device is used for assisting the static pressure hydrometer to indirectly measure the specific gravity of the liquid medium by the static pressure method, and the instrument coefficient k of the differential pressure sensor 8 can be quickly obtained. The error of the specific gravity can be seen from a specific gravity measurement formula from the differential pressure sensor 8 and the standard specific gravity liquid, the higher the precision of the standard specific gravity liquid and the differential pressure sensor 8 is, the higher the accuracy of the specific gravity measurement is, the specific gravity measurement is irrelevant to the geometric dimension of equipment and the pressure taking center distance h of an upper pressure taking port and a lower pressure taking port of the equipment, the specific gravity error can be ignored, and the accuracy and the reliability of the measured specific gravity of the medium can be greatly improved.
The theoretical analysis of the above formula for measuring specific gravity is as follows:
assuming that the center-to-center distance between the upper pressure taking flange 6 and the lower pressure taking flange is h1, the density of the filling liquid medium in the sensor capillary 7 is rhoSiliconThe static pressure P to which the differential pressure sensor 8 is subjected0Comprises the following steps:
P0＝ρsilicongh1---------------①
According to the second step of the process of measuring specific gravity, the following results are obtained:
(ρsign board-ρSilicon)gh1＝p1---------------②
When the on-site correcting device is put into use, the static pressure P borne by the differential pressure sensor 8MeasuringComprises the following steps:
(ρmeasuring-ρSilicon)gh1＝pMeasuring---------------③
Substituting the formula (I) into a formula (II) to obtain:
ρsign boardgh1＝P1-P0-------------④
Substituting the formula (I) into the formula (III) can obtain:
ρmeasuringgh1＝PMeasuring-P0-------------⑤
The formula is obtained by sorting a formula (fifth), (fifth) and a formula (fourth):
it can be seen from the formula that the specific gravity of the medium corresponds to the static pressure detected by the differential pressure sensor 8.
In conclusion, the field correction device is used for assisting the static pressure hydrometer to measure the specific gravity of the liquid medium indirectly by the static pressure method, the influence of the accuracy of the pressure measuring center distance h on the measured specific gravity of the medium can be effectively reduced, the field correction on the static pressure hydrometer is realized, and the accurate and reliable specific gravity of the medium is obtained.
Claims (2)
1. The on-site correction device of the static pressure hydrometer is characterized in that: comprises an upper pressure tapping pipe (9), a lower pressure tapping pipe, a pressure guiding pipe (5) and a differential pressure sensor (8);
an upper pressure tapping valve (1) is arranged on the upper pressure tapping pipe (9), and an upper pressure tapping flange (6) is arranged at the liquid outlet end of the upper pressure tapping pipe (9);
a lower pressure tapping valve is arranged on the lower pressure tapping pipe, and a lower pressure tapping flange is arranged at the liquid outlet end of the lower pressure tapping pipe;
the pressure guiding pipe (5) is in a mu shape and comprises a first pressure guiding pipe section, a second pressure guiding pipe section and a sewage discharge pipe section with a sewage discharge valve (3), wherein the lower ends of the first pressure guiding pipe section and the second pressure guiding pipe section are communicated together, and the liquid inlet end of the sewage discharge pipe section is communicated with the lower end of the first pressure guiding pipe section;
the first pressure guiding pipe section is respectively communicated with the upper pressure taking pipe (9) and the lower pressure taking pipe, the connecting part of the first pressure guiding pipe section and the upper pressure taking pipe (9) is positioned between the upper pressure taking valve (1) and the upper pressure taking flange (6), and the connecting part of the first pressure guiding pipe section and the lower pressure taking pipe is positioned between the lower pressure taking valve and the lower pressure taking flange;
a correction valve (2) is arranged on the first pressure guiding pipe section, and the correction valve (2) is positioned on the upper side of the connection part of the first pressure guiding pipe section and the upper pressure tapping pipe (9);
the differential pressure sensor (8) is respectively communicated with the upper pressure taking flange (6) and the lower pressure taking flange through two sensor capillary tubes (7).
2. The apparatus for field calibration of a hydrostatic pycnometer as claimed in claim 1, wherein: and the upper end of the first pressure guide pipe section and the upper end of the second pressure guide pipe section are both provided with observation containers (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220038965.XU CN216695959U (en) | 2022-01-04 | 2022-01-04 | On-site correcting device for static pressure method hydrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220038965.XU CN216695959U (en) | 2022-01-04 | 2022-01-04 | On-site correcting device for static pressure method hydrometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216695959U true CN216695959U (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220038965.XU Active CN216695959U (en) | 2022-01-04 | 2022-01-04 | On-site correcting device for static pressure method hydrometer |
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| CN (1) | CN216695959U (en) |
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2022
- 2022-01-04 CN CN202220038965.XU patent/CN216695959U/en active Active
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