CN110763394A - Annular pressure measuring device for liquid differential pressure measurement in vertical round pipe in experimental site - Google Patents
Annular pressure measuring device for liquid differential pressure measurement in vertical round pipe in experimental site Download PDFInfo
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- CN110763394A CN110763394A CN201911000776.2A CN201911000776A CN110763394A CN 110763394 A CN110763394 A CN 110763394A CN 201911000776 A CN201911000776 A CN 201911000776A CN 110763394 A CN110763394 A CN 110763394A
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- 230000003139 buffering effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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Abstract
The invention discloses an annular pressure measuring device for measuring the differential pressure of liquid in a vertical round pipe in an experimental site, belonging to the field of flow measurement; the throttling device is arranged in the middle section of the vertical round pipe, and the two annular pressure taking devices are respectively and vertically arranged on the high-pressure section and the low-pressure section of the vertical round pipe; the annular pressure taking device comprises pressure taking pipes, a pressure equalizing ring and a measuring pipe, wherein the axes of the pressure taking pipes are located on the same plane, the pressure equalizing ring is an annular pipe, the four pressure taking pipes are uniformly arranged on the inner side of the pressure equalizing ring, the four pressure taking pipes are smoothly connected with a measured vertical round pipe through pressure taking holes, the measuring pipe is arranged on the outer side of the pressure equalizing ring, a differential pressure transmitter is arranged outside the measuring pipe, and liquid in the vertical round pipe enters the pressure equalizing ring through the pressure taking pipes and is uniformly mixed in the pressure equalizing ring. The invention improves the direct pressure taking mode widely adopted in the prior thermal hydraulic experiment, avoids the adverse effects of pulsating pressure, vibration and the like on differential pressure measurement, and improves the differential pressure measurement precision.
Description
Technical Field
The invention belongs to the technical field of flow measurement, and particularly relates to an annular pressure measuring device for measuring the differential pressure of liquid in a vertical round pipe in an experimental site.
Background
The experimental research of thermal hydraulics is an important component of the research of fluid mechanics in the professional disciplines of energy power engineering, nuclear technology, petrochemical industry and the like. The fluid differential pressure is a key measurement parameter in a thermal hydraulic experiment, so that the accurate measurement of the differential pressure of the experimental fluid working medium in an experimental environment is an important guarantee about the accuracy and the measurement reliability of the experiment.
Pressure is defined as the force acting vertically on a unit area by a medium, the so-called pressure in physics; the difference between the pressures of any two points is the differential pressure. In a thermodynamic experimental environment, according to the principle of fluid mechanics, fluid pressure is mainly composed of two parts, namely hydrostatic pressure caused by gravity and flowing dynamic pressure caused by fluid flow. At present, in industrial application, widely used pressure measurement methods mainly include a liquid column type pressure gauge, an elastic type pressure gauge, an electric type pressure gauge and a piston type pressure gauge, wherein the liquid column type pressure gauge and the elastic type pressure gauge are generally not used for automatic differential pressure measurement in a thermal hydraulic experiment field due to the defects of inconvenient reading, incapability of remote control and the like; the piston type pressure gauge is mainly used as a standard instrument for calibrating and calibrating other pressure measuring equipment and is not used for measuring differential pressure in an experimental site; considering that the fluid flow rate is large and the pressure is considerable in the thermal hydraulic experiment, and meanwhile, in order to facilitate automatic data acquisition, transmission and remote control, the differential pressure measurement in the experimental environment is realized by adopting a differential pressure transmitter. The invention is based on the fact that an industrial differential pressure transmitter is used as pressure measuring equipment, and in the installation process of the differential pressure transmitter, the arrangement of pressure taking points and the pressure taking mode have obvious influence on the measuring accuracy.
At home and abroad, the relevant research aiming at differential pressure measurement mostly focuses on terminal development and theoretical research of measuring equipment, and the research on the fundamental content of a pressure measuring mode is quite lacking. The Xukeji et al design a pressure vessel water level measurement system based on the thermal diffusion principle with the monitoring of the pressure vessel water level after a nuclear power accident as an application background. The system has the characteristics of visual measurement, simple signal processing and the like.
In order to solve the cause of the differential pressure measurement deviation of the left and right air inlet passages of the engine, Liukun et al clarify the association and influence among a pressure measuring pipeline, testing equipment and a static pressure hole and determine the cause of the deviation by analyzing the structure and the principle of a pressure measuring system of the air inlet passages in the article of analysis of the cause of the differential pressure measurement deviation of the left and right air inlet passages of the engine; the measurement deviation of the left and right air inlet channels is reduced by adopting the measures of reasonable layout of the pressure measuring pipelines, reasonable selection of the testing equipment and reasonable maintenance of the static pressure holes; but the differential pressure measurement in the scheme still adopts the traditional direct pressure taking mode.
For example, in the annular orifice plate throttling device and the pressure-taking and sewage-discharging method thereof disclosed in the Chinese publication No. ZL201810394606.6, the pressure-leading pipe and the sewage-discharging pipe are in the same straight line by shifting and modifying the sewage-discharging pipe on the annular orifice plate throttling device, so that the timely sewage discharge and the dredging of the pressure-taking pipeline are facilitated. The invention is mainly used for gas working media such as coal gas and the like, and mainly focuses on pollution discharge.
In summary, in the middle and low pressure and middle and low temperature thermal hydraulic experiments, the research on the pressure measuring and taking mode of the liquid differential pressure in the vertical round pipe is not sufficient, and the pertinence is not strong enough. The main expression is in the following three aspects: 1) at present, the traditional direct pressure taking mode is mostly adopted for measuring the liquid differential pressure in the thermal hydraulic experiment, and the mode has inherent defects in the aspect of measurement accuracy and has less related experimental research; 2) in medium-low pressure and medium-low temperature thermal hydraulic experiment environments, the research on a differential pressure measurement pressure taking method is few, and no clear design standard exists; 3) the related research of the liquid differential pressure measurement pressure taking mode in the vertical round pipe is less. Meanwhile, in order to stabilize the fluid flow in the conventional direct pressure measurement mode, the length of the pressure guide pipe is as long as possible, and adverse effects are brought to equipment installation, space utilization and the like in narrow spaces such as laboratories.
Aiming at the defects of a direct pressure taking method adopted by the measurement of the liquid differential pressure in the vertical round pipe in the thermal hydraulic experiment at present, in order to accurately measure the liquid differential pressure in the thermal hydraulic experiment, the annular pressure taking device suitable for the measurement of the liquid differential pressure in the experiment field such as a middle-low pressure and middle-low temperature thermal hydraulic experiment rack, an experiment device and the like is designed, and the annular pressure taking device has positive significance for the accuracy of the experiment measurement and the engineering application.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides an annular pressure measuring device for measuring the differential pressure of liquid in a vertical round pipe in an experimental site, which is characterized by comprising the following components: the device comprises a vertical round pipe, a throttling device and two annular pressure taking devices, wherein the throttling device is arranged in the middle section of the vertical round pipe, and the two annular pressure taking devices are respectively and vertically arranged on a high-pressure section and a low-pressure section of the vertical round pipe;
the annular pressure taking device comprises pressure leading pipes, a pressure equalizing ring and a measuring pipe, wherein the axes of the pressure leading pipes are positioned on the same plane, the pressure equalizing ring is an annular pipe, the four pressure leading pipes are uniformly arranged on the inner side of the pressure equalizing ring, the four pressure leading pipes are smoothly connected with a measured vertical round pipe through pressure taking holes, the measuring pipe is arranged on the outer side of the pressure equalizing ring, a differential pressure transmitter is arranged outside the measuring pipe, and liquid in the vertical round pipe 1 enters the pressure equalizing ring through the pressure leading pipes and is uniformly mixed in the pressure equalizing ring; the length of the pressure guiding pipe is more than or equal to 10 times of the diameter of the pressure taking hole.
The inner diameter of the pressure guiding pipe, the inner diameter of the equalizing ring and the inner diameter of the measuring pipe are equal to the aperture of the pressure taking hole.
The pressure taking hole is circular; the axis of the pressure measuring hole is vertical to the axis of the vertical round pipe, and the diameter of the pressure measuring hole is smaller than 8% of the diameter of the vertical round pipe.
The measuring tube is collinear with any one of the four pressure guiding tubes.
The invention has the beneficial effects that:
1. the accurate measurement of the liquid differential pressure in the round pipe at the experimental sites of middle and low pressure, middle and low temperature thermodynamic experiment bench, experimental device, etc.
2. The adverse effect that liquid probably leads to the differential pressure measurement because the velocity of flow is too high when flowing in the pipe is effectively alleviated, plays the cushioning effect.
3. The direct pressure taking mode widely adopted in the prior thermal hydraulic experiment is improved, the adverse effects of pulsating pressure, vibration and the like on differential pressure measurement are avoided, the differential pressure measurement precision is improved, and the experiment accuracy and the measurement reliability are ensured.
4. The pressure equalizing pipe enables liquid to be uniformly mixed, has a good buffering effect, and improves measurement accuracy and data stability.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an annular pressure measuring device for measuring differential pressure of liquid in a vertical round pipe in an experimental site according to the present invention;
FIG. 2 is a front view of an embodiment of the present invention;
fig. 3 is a cross-sectional view of fig. 2 at section a-a.
Wherein: 1-vertical round tube, 2-annular pressure taking device, 3-throttling device, 201-pressure leading tube, 202-equalizing ring, 203-measuring tube, 204-pressure taking hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention shown in fig. 1 is used for measuring the liquid differential pressure (pressure difference) between two points in the vertical round pipe 1, so that the annular pressure measuring device 2 is divided into a high-pressure section pressure measuring device and a low-pressure section pressure measuring device according to the liquid flowing direction; the embodiment comprises the following steps: the device comprises a vertical round pipe 1, a throttling device 3 and two annular pressure taking devices 2, wherein the throttling device 3 is arranged in the middle section of the vertical round pipe 1; due to the existence of the throttling device 3, differential pressure exists in flowing liquid in the vertical round pipe 1, and the downstream direction of the vertical round pipe 1 is a low-pressure section;
the two annular pressure measuring devices 2 of the high-pressure section pressure measuring device and the low-pressure section pressure measuring device are respectively and vertically arranged on the high-pressure section and the low-pressure section of the vertical circular tube 1; in order to ensure that the pressure taking point can accurately reflect the liquid pressure, and avoid pressure loss caused by local resistance, the distance between the high-pressure section pressure taking device and the throttling device 3 is more than 10D (D is the inner diameter of the vertical circular tube 1) as far as possible; the distance between the low-pressure section pressure taking device and the throttling device 3 is more than 5D; in addition, according to the principle of fluid mechanics, the following principles are also required to be followed when the annular pressure tapping device 2 is installed:
in this embodiment, the throttling device 3 is a stainless steel sheet with a chord-cut circular shape, and the throttling device 3 is installed between flanges of the plurality of vertical circular tubes 1 through flanges arranged on the outer sides;
in the present embodiment, the inner diameter of the vertical round tube 1 is 123 mm;
in this embodiment, the distance between the high-pressure section pressure measuring device and the throttling device 3 is 1403mm, and the distance between the low-pressure section pressure measuring device and the throttling device 3 is 630 mm;
1) the annular pressure taking device 2 needs to be arranged at a pipe section part where liquid flows linearly, and cannot be arranged at an elbow, a tee joint and other places where vortex is likely to occur, so that local pressure loss is avoided;
2) the annular pressure taking device 2 needs to be vertical to the flowing direction of liquid in the vertical round pipe 1;
3) the liquid entering the pressure taking device is required to be ensured to be a single-phase medium without gas mixing, an exhaust port is required to be reserved, and in the annular pressure taking device 2, exhaust is carried out by utilizing an exhaust hole of a differential pressure transmitter;
4) in order to prevent the outer wall of the annular pressure measuring device 2 from being frozen in cold conditions, the experiment needs to be coated by a heat-insulating layer, so that the temperature is prevented from being greatly changed.
As shown in fig. 2, the annular pressure measuring device 2 includes a pressure tapping pipe 201, a pressure equalizing ring 202 and a measuring pipe 203, the axes of which are located on the same plane, wherein the pressure equalizing ring 202 is an annular pipe, four pressure tapping pipes 201 are uniformly installed on the inner side of the pressure equalizing ring 202, the four pressure tapping pipes 201 are smoothly connected with the measured vertical round pipe 1 through pressure tapping holes 204, the measuring pipe 203 is installed on the outer side of the pressure equalizing ring 202, the axis of the measuring pipe 203 is collinear with any radial line of the pressure equalizing ring 202, the outer end of the measuring pipe 203 is connected with a high-pressure end or a low-pressure end corresponding to a differential pressure transmitter through a metal hose, and the differential pressure transmitter leads out; liquid in the vertical round pipe 1 enters the equalizing ring 202 through the pressure leading pipe 201 and is uniformly mixed in the equalizing ring 202, so that adverse effects on differential pressure measurement caused by flow-induced vibration and pulsating pressure are avoided, and a buffering effect is achieved; the liquid mixed by the equalizing ring 202 is finally connected with the high and low pressure receiving ends of the differential pressure transmitter through the measuring pipe 203 to finish differential pressure measurement; the inner diameter and the outer diameter of the pressure guiding pipe 201 and the equalizing ring 202 are equal to those of the measuring pipe 203, the inner diameter is equal to the aperture of the pressure taking hole 204, and the length of the pressure guiding pipe 201 is more than or equal to 10 times of the diameter of the pressure taking hole 204;
the pressure tapping hole 204 is circular; the axis of the pressure taking hole 204 is vertical to the axis of the vertical round pipe 1; in order to ensure that the liquid is fully mixed in the equalizing ring 202, the pressure leading pipe 201 is directly connected with the measured vertical round pipe 1; meanwhile, the pressure leading pipe 201 is directly connected with the measured vertical round pipe 1, and the flow rate in the round pipe is high, so that the diameter of the pressure taking hole 204 is smaller than 0.08D under the condition that the drilling precision and the smooth liquid flow are ensured, the interference on the liquid flow in the round pipe is avoided, and the inner diameter of the grading ring 202 is adjusted according to the diameter of the measured round pipe;
since the liquid flowing from the pressure equalizing pipe 201 is uniformly mixed in the pressure equalizing ring, the measuring pipe 203 is arranged in line (facing) with any one of the four pressure equalizing pipes 201 in the embodiment, and the measuring result is not affected;
in the embodiment, the used differential pressure transmitter is a 3051DP4A22A1AB4M5HR5K8 differential pressure transmitter of Rossimont, wherein the range of the range is 248.6-710 kPa, the working temperature is-50-250 ℃, the high-pressure end and the low-pressure end of the differential pressure transmitter are connected with a metal hose through threads, and the exhaust operation is completed through a built-in exhaust knob;
in the embodiment, the smooth connection mode is smooth welding, that is, the welding position near the pressure tapping hole 204 has no obvious chamfer, groove, burr and the like, so that pressure loss caused by additional resistance is avoided;
in this embodiment, the outer diameter of the grading ring 202 is 173.50 mm;
in the present embodiment, the length of the pressure guiding tube 201 is 100mm, and other main parameters of the annular pressure taking device 2 are shown in table 1.
TABLE 1 annular pressure tapping device 2 Main parameters
The specific installation workflow of this embodiment is:
1) manufacturing an annular pressure measuring device 2 according to the table 1, then installing the annular pressure measuring device on a vertical circular tube 1, and dividing the annular pressure measuring device into a high-pressure section pressure measuring device and a low-pressure section pressure measuring device according to specific positions;
2) connecting the measuring tubes 203 in the high-pressure section pressure taking device and the low-pressure section pressure taking device with the high-pressure end and the low-pressure end of a differential pressure transmitter respectively;
3) the whole measured circular pipeline and the annular pressure taking device 2 are filled with the liquid working medium to be tested;
4) exhaust holes are reserved through the differential pressure transmitter for exhausting, the annular pressure taking device 2 is guaranteed to be single-phase liquid, and air blockage is prevented;
5) differential pressure measurement is completed in the experimental process.
Claims (4)
1. The utility model provides a pressure equipment is got to annular that is used for vertical intraductal liquid differential pressure measurement of experiment scene, its characterized in that includes: the device comprises a vertical round pipe (1), a throttling device (3) and two annular pressure taking devices (2), wherein the throttling device (3) is arranged in the middle section of the vertical round pipe (1), and the two annular pressure taking devices (2) are respectively and vertically arranged on a high-pressure section and a low-pressure section of the vertical round pipe (1);
the annular pressure measuring device (2) comprises pressure guide pipes (201) with axes positioned on the same plane, a pressure equalizing ring (202) and a measuring pipe (203), wherein the pressure equalizing ring (202) is an annular pipe, four pressure guide pipes (201) are uniformly arranged on the inner side of the pressure equalizing ring (202), the four pressure guide pipes (201) are smoothly connected with a measured vertical round pipe (1) through pressure measuring holes (204), the measuring pipe (203) is arranged on the outer side of the pressure equalizing ring (202), a differential pressure transmitter is arranged outside the measuring pipe (203), and liquid in the vertical round pipe (1) enters the pressure equalizing ring (202) through the pressure guide pipes (201) and is uniformly mixed in the pressure equalizing ring (202); the length of the pressure guiding pipe (201) is more than or equal to 10 times of the diameter of the pressure taking hole (204).
2. An annular pressure taking device for liquid differential pressure measurement in a vertical round pipe in an experimental site according to claim 1, characterized in that the inner diameter of the pressure leading pipe (201), the inner diameter of the pressure equalizing ring (202), the inner diameter of the measuring pipe (203) and the aperture of the pressure taking hole (204) are equal.
3. The annular pressure taking device for the differential pressure measurement of the liquid in the vertical round pipe in the experimental site is characterized in that the pressure taking hole (204) is circular; the axis of the pressure measuring hole (204) is vertical to the axis of the vertical round pipe (1), and the diameter of the pressure measuring hole is smaller than 8% of the diameter of the vertical round pipe (1).
4. An annular pressure tapping device for the differential pressure measurement of liquid in a vertical round pipe at an experimental site according to any one of claims 1 or 2, characterized in that the measuring pipe (203) is collinear with any one of four pressure tapping pipes (201).
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| CN201911000776.2A CN110763394A (en) | 2019-10-21 | 2019-10-21 | Annular pressure measuring device for liquid differential pressure measurement in vertical round pipe in experimental site |
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| CN201911000776.2A CN110763394A (en) | 2019-10-21 | 2019-10-21 | Annular pressure measuring device for liquid differential pressure measurement in vertical round pipe in experimental site |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509715A (en) * | 2020-11-16 | 2021-03-16 | 中国原子能科学研究院 | Seven subassembly flow measurement experiment sections |
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| CN101382445A (en) * | 2008-09-17 | 2009-03-11 | 天津大学 | Double differential pressure throttle moisture measuring device |
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| CN202522274U (en) * | 2012-03-27 | 2012-11-07 | 大连经济技术开发区山海电子有限公司 | Integrated temperature and pressure compensatory venturis taper pipe flow meter |
| CN108414041A (en) * | 2018-04-27 | 2018-08-17 | 湖北新冶钢特种钢管有限公司 | A kind of annular perforated-plate throttling device and its pressure method for discharging pollution |
| CN211696775U (en) * | 2019-10-21 | 2020-10-16 | 华北电力大学 | Annular pressure measuring device for liquid differential pressure measurement in vertical round pipe in experimental site |
-
2019
- 2019-10-21 CN CN201911000776.2A patent/CN110763394A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2354112Y (en) * | 1998-11-30 | 1999-12-15 | 邵朋诚 | Annular perforated-plate throttling device |
| CN201034644Y (en) * | 2007-04-28 | 2008-03-12 | 上海肯特智能仪器有限公司 | Annular pressure sampling type V awl flow rate sensor |
| CN101382445A (en) * | 2008-09-17 | 2009-03-11 | 天津大学 | Double differential pressure throttle moisture measuring device |
| CN201348520Y (en) * | 2008-12-05 | 2009-11-18 | 陕西仪新测控仪表有限公司 | Concealed ring-type cone throttling device |
| CN202522274U (en) * | 2012-03-27 | 2012-11-07 | 大连经济技术开发区山海电子有限公司 | Integrated temperature and pressure compensatory venturis taper pipe flow meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509715A (en) * | 2020-11-16 | 2021-03-16 | 中国原子能科学研究院 | Seven subassembly flow measurement experiment sections |
| CN112509715B (en) * | 2020-11-16 | 2022-08-05 | 中国原子能科学研究院 | Seven subassembly flow measurement experiment sections |
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