CN102735292B - Differential pressure type flow rate measuring device - Google Patents
Differential pressure type flow rate measuring device Download PDFInfo
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- CN102735292B CN102735292B CN201210201896.0A CN201210201896A CN102735292B CN 102735292 B CN102735292 B CN 102735292B CN 201210201896 A CN201210201896 A CN 201210201896A CN 102735292 B CN102735292 B CN 102735292B
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Abstract
The invention relates to a differential pressure type flow rate measuring device, which comprises a Venturi pipe, a pressure differential sensor, a pressure sensor, a temperature sensor, a pressure lead pipeline, an integrated converter and a shielding cable, wherein the Venturi pipe is formed through machining in one step and comprises a main body pipeline, an installing flange, a hexagonal lug boss, a plane lug boss, a sealing connecting nozzle and the like, the pressure differential sensor and the pressure sensor are respectively connected with the sealing connecting nozzle of the Venturi pipe through a pressure lead pipeline, the pressure differential sensor and a pad block are directly arranged on the Venturi pipe through screw threads, the length of a pressure differential pressure lead pipeline is effectively shortened, the temperature sensor is directly arranged on the sealing connecting nozzle, the pressure differential sensor, the pressure sensor and the temperature sensor are connected with the integrated converter through the shielding cable, and the integrated converter is used for carrying out temperature compensation and fusion processing for outputting analog or digital signals. The measuring device has the advantages that the measurement precision is high, the impact and overloading resistance capability is high, the environment adaptability is good, the measuring range is wide, the reliability is high, and the like.
Description
Technical field
The present invention relates to a kind of differential pressure type flow meter, belong to flow measurement field.
Background technology
Flow sensor has important application in space telemetry field.The continuous renewal of the high speed development of aerospace industry and model task, the environmental suitability of flow sensor and shock resistance overload capacity have proposed more urgent, harsh designing requirement.For example, for the carrier rocket and the aircraft of new generation that use oxyhydrogen engine, oxygen flow in its oxygen supercharging conveyance conduit is measured most important, and that the various flowmeters that generally adopt in industrial circle at present are all difficult to meet this mechanical environment is severe, the significant high speed oxygen airshed of temperature variation is measured requirement.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art, a kind of differential pressure type flow meter is provided, this device has that measurement range is wide, good environmental adaptability, the Chinese People's Anti-Japanese Military and Political College impacts and the ability of high overload is strong, the advantages such as reliability is high, easy care, can be applied to have under rugged surroundings the various gas mass flow fields of measurement of high reliability request.
Above-mentioned purpose of the present invention is achieved by following technical solution:
A kind of differential pressure type flow meter, comprise Venturi tube, differential pressure pick-up, pressure transducer, temperature sensor, the first impulse pipeline, the second impulse pipeline, the 3rd impulse pipeline, cushion block, the first clip, the second clip, integrated converter and shielded cable, wherein Venturi tube is a machine add-on type, comprise main line, two mounting flanges, plane boss, three six side's boss, four sealings connect mouth and two clip stopper slots, main line is tightly connected with the tested pipeline of the tested pipeline in upstream and downstream respectively by two mounting flanges at two ends, on plane boss, cushion block is installed, differential pressure pick-up is arranged on cushion block, the first sealing connects the forward of mouth by the first impulse pipeline and differential pressure pick-up and seals and connect mouth and be connected, the second sealing connects the negative sense of mouth by the second impulse pipeline and differential pressure pick-up and seals and connect mouth and be connected, the 4th sealing connects mouth and by the 3rd impulse pipeline, connects mouth with the sealing of pressure transducer and be connected, the 3rd sealing connects mouth for mounting temperature sensor, two clip stopper slots carry out respectively spacing to the first clip and the second clip, further improve the impact resistance of Venturi tube, differential pressure pick-up, pressure transducer and temperature sensor are connected with integrated converter by shielded cable, by integrated converter, carry out uniform data fusion treatment.
In above-mentioned differential pressure type flow meter, the bottom of differential pressure pick-up is arranged on the installation table top of cushion block by screw, and the positive pressure of differential pressure pick-up meets the root run place that mouth and negative pressures connect mouth and lays respectively in two semicircle draw-in grooves of cushion block both sides, two semicircle clips respectively by screw fastening on two semicircle draw-in grooves.
In above-mentioned differential pressure type flow meter, cushion block is by four screws and the fastening plane boss that is arranged on Venturi tube of four flat shims, on plane boss, be carved with two round rectangle grooves, two round rectangle pieces formation transition fit corresponding with cushion block bottom respectively, thereby cushion block is carried out spacing, promote impact resistance.
In above-mentioned differential pressure type flow meter, main line comprises upstream straight length, contraction section, and throat's straight length, divergent section and downstream straight length, the inside diameter D of its middle and upper reaches straight length and downstream straight length is consistent with the internal diameter of the tested pipeline in upstream and downstream.
In above-mentioned differential pressure type flow meter, six side's boss in Venturi tube are positioned on the straight length of upstream, and six side's boss are positioned on throat's straight length, and six side's boss are positioned on the straight length of downstream.
In above-mentioned differential pressure type flow meter, sealing in impulse pipeline and Venturi tube connects between mouth, the positive pressure of impulse pipeline and differential pressure pick-up connects mouth and negative pressures connects between mouth, impulse pipeline and the pressure of pressure transducer connect between mouth and sealing connects the hermetically-sealed construction that all adopts 24 ° of inner cones of standard to coordinate pair bulbs between mouth and temperature sensor, by cap nut, carry out fit sealing.
In above-mentioned differential pressure type flow meter, the length of the first impulse pipeline and the second impulse pipeline is 50-100mm, and the length of the first impulse pipeline and the second impulse pipeline is consistent.
In above-mentioned differential pressure type flow meter, the first impulse pipeline, the second impulse pipeline and the 3rd impulse pipeline directly carry out impulse by tested gas medium, without adopting liquid impulse.
In above-mentioned differential pressure type flow meter, Venturi tube, differential pressure pick-up, pressure transducer, temperature sensor and impulse pipeline all adopt stainless steel material.
The present invention compared with prior art has following beneficial effect:
(1) the present invention has carried out the structural design of novelty to measurement mechanism, differential pressure pick-up is arranged in Venturi tube by cushion block, effectively shortened the length of differential pressure pick-up impulse pipeline, and guaranteed the symmetry of positive and negative both direction impulse pipeline, both can guarantee measuring accuracy, can directly use again tested gas medium as impulse medium, without using special liquid as impulse medium, increase environmental suitability and the impact resistance of this measurement mechanism;
(2) in measurement mechanism of the present invention, differential pressure pick-up is installed and on cushion block used, is designed with multiple special position limiting structure, differential pressure pick-up is provided to the limit function of three directions, to the weld seam interface of differential pressure pick-up both sides pressure-inducing nozzle root, provide extra security measure simultaneously, effectively promoted the impact resistance of measurement mechanism;
(3) in measurement mechanism of the present invention, Venturi tube comprises main line, mounting flange, plane boss, six side's boss, sealing connects mouth, and clip stopper slots etc. adopt the higher metal material of intensity, one piece machine add-on type, effectively reduce weld seam quantity, guaranteed the impermeability of device, effectively improved reliability;
(4) in measurement mechanism of the present invention, differential pressure pick-up and pressure transducer connect mouth by impulse pipeline and sealing in Venturi tube respectively and are connected, temperature sensor is directly installed on sealing and connects on mouth, sealing means all adopts the metal hard sealing structure of standard, both guarantee sealing property, be convenient to again installation and maintenance;
(5) in measurement mechanism of the present invention differential pressure pick-up, pressure transducer and temperature sensor all by shielded cable be arranged on site environment relatively the integrated converter of good position be connected, by integrated converter, carry out uniform data fusion and compensation deals, each sensor unit does not contain treatment circuit, thereby has improved the environmental suitability of measurement mechanism;
(6) in the Venturi tube in measurement mechanism of the present invention, be processed with two symmetrical grooves and two clips carried out spacing, further improve the impact resistance of Venturi tube;
(7) the present invention has provided the first pressure guiding pipe of differential pressure pick-up by lot of experiments and the optimum length range of the second pressure guiding pipe is 50-100mm, more preferably 70mm, and the length of two pressure guiding pipes is consistent, if pressure guiding pipe length is long, the response meeting of pressure is slowed down because of cavity effect, if pressure guiding pipe length is too short, cause the sensitive element of differential pressure pick-up to lack necessary temperature buffer, thereby be directly exposed to height, among cryogenic gas, and then cause the sensitive element generation irreversible change in differential pressure pick-up and affect measuring accuracy, be response speed and the security feature that definite need of pressure guiding pipe length are taken into account sensitive element,
(8) test shows that the uncertainty of coefficient of flow of the present invention is less than 1%, reaches high-precision measurement standard; In addition, the present invention can tolerate the shock environment of 4000g and the hot environment of 150 ℃.
Accompanying drawing explanation
Fig. 1 is differential flow measurement mechanism structural representation of the present invention;
Fig. 2 is differential flow measurement mechanism Venturi tube inner structure schematic diagram of the present invention;
Fig. 3 is differential flow measurement mechanism differential pressure pick-up scheme of installation of the present invention;
Fig. 4 is that the coefficient of flow of different capacitance flow measurement device of the present invention is at the change curve with Reynolds number;
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Differential pressure type flow meter is according to a kind of throttle type measurement mechanism of weighing uninterrupted according to pressure reduction of Venturi effect design, caliber by the main body pipeline of Venturi tube shrinks the part circulation reduced cross-sectional that causes pipeline, flow velocity is improved, kinetic energy increases, static pressure reduces, thereby meet mouth place and throat packing meets the pressure differential Δ p that between mouth place, generation is larger in upstream seal, it is basis that venturi differential pressure type flow measurement method be take flow continuity equation (law of conservation of mass) and Bernoulli equation (law of conservation of energy), its mass flow calculation formula is as follows:
In formula, q
mrepresentation unit flows through the fluid mass of pipeline in the time, C represents efflux coefficient, the expansibility factor that ε is measured medium, C ε is commonly called coefficient of flow, and D represents internal diameter of the pipeline, and β is throttling diameter ratio, be throat's inner diameter d and the ratio of internal diameter of the pipeline D, ρ is Media density.
The concrete Test Cycle of the present embodiment is as follows: measuring media is oxygen, and medium temperature scope is-70 ℃～+ 150 ℃, and flow measurement range is 0.2～2kg/s, and pressure medium is 0.1MPa～2MPa.
Be illustrated in figure 1 differential flow measurement mechanism structural representation of the present invention, measurement mechanism comprises Venturi tube 1, differential pressure pick-up 2, pressure transducer 3, temperature sensor 4, the first impulse pipeline 5, the second impulse pipeline 6, the 3rd impulse pipeline 7, cushion block 8, the first clip 9, the second clip 10, integrated converter 11 and shielded cable 12 as seen from the figure.Venturi tube 1 adopts the high metal material of intensity, a machine add-on type, and differential pressure pick-up 2 adopts high precision silicon pressure resistance type differential pressure sensitive element, and pressure transducer 3 adopts high precision absolute pressure sensor.The first impulse pipeline 5, the second impulse pipeline 6 and the 3rd impulse pipeline 7 directly carry out impulse by tested gas medium oxygen, without adopting liquid impulse.
Be illustrated in figure 2 the structural representation of Venturi tube of the present invention, Venturi tube 1 comprises main line 13 as seen from the figure, mounting flange 14,15, and plane boss 16, six side's boss 17,18,19, sealing connects mouth 20,21,22,23, clip stopper slot 24,25.Main line 13 comprises upstream straight length 26, contraction section 27, throat's straight length 28, divergent section 29, downstream straight length 30.Upstream straight length 26 is consistent with the inside diameter D of downstream straight length 30 and the internal diameter of tested pipeline, the angle of throat θ of contraction section 27 designs its scope between (21 ± 1) ° according to managing design specifications GB/T 2624.4 in mound, the angle of divergence alpha of divergent section 29 designs its scope between (7～15) ° according to managing design specifications GB/T 2624.4 in mound, the inner diameter d of throat's straight length 28, undergauge designs according to venturi design standard GB/T2624.4 than inside dimension parameters such as β, wherein undergauge need be less than 0.75 than β, in the present embodiment
α=21 °, θ=7 °, β=0.7407.
Two end faces of mounting flange 14,15 are carved with respectively seal groove 31 and 32, Venturi tube 1 is fastened and connected by bolt with the tested pipeline of the tested pipeline in upstream and downstream respectively by mounting flange 14,15, the concrete size of seal groove 31,32 is mated with the rubber seal size of selecting, the nominal diameter of bolt and number require to determine according to the installation strength in actual condition, and in the present embodiment, each mounting flange is selected 12 M8 bolts.
In the present embodiment, in Venturi tube 1, be designed with three six side's boss 17,18 and 19.Six side's boss 17 are positioned on the upstream straight length 26 of Venturi tube 1, and six side's boss 18 are positioned on throat's straight length 28, and six side's boss 19 are positioned on downstream straight length 30.Sealing in Venturi tube 1 connects mouth 20, 21 lay respectively on two table tops that six side's boss 17 are identical with 18 directions, sealing connects the forward of mouth 20 by the first impulse pipeline 5 and differential pressure pick-up 2 and seals and connect mouth 40 and be connected, sealing connects the negative sense of mouth 21 by the second impulse pipeline 6 and differential pressure pick-up 2 and seals and connect mouth 41 and be connected, sealing connects mouth 23 and by the 3rd impulse pipeline 7, connects mouth 63 with the sealing of pressure transducer 3 and be connected, be positioned on six side's boss 17, table top of living in is different from the table top of living in that sealing connects mouth 20, in the present embodiment, be positioned at the relative table top that sealing connects the table top of living in of mouth 20.Sealing connects mouth 22 and is positioned on six side's boss 19 and connects with sealing the table top that mouth 20,21 table top direction of living in is identical, for mounting temperature sensor 4.Because the temperature variation of air-flow after venturi pipeline is very little, while specifically implementing, the installation site of temperature sensor 4 both can be arranged on upstream, also can be arranged on downstream, and in the present embodiment, the sealing that is arranged on downstream straight length 30 connects on mouth 22.
Be illustrated in figure 3 the scheme of installation of differential pressure type flow meter differential pressure pick-up of the present invention, plane boss 16 is for cushion block 8 and differential pressure pick-up 2 are installed, and it is installed on table top and is designed with 4 M5 screws.Cushion block 8 is by the fastening plane boss 16 that is arranged on Venturi tube 1 of 42,43,44,45 and four flat shims 46,47,48,49 of four M5 screws.On plane boss 16, be carved with round rectangle piece that two round rectangle grooves 38,39 are corresponding with cushion block 8 bottoms 50,51 and form transition fit, thereby cushion block 8 is carried out spacing, promote impact resistance.
In the present embodiment, the bottom of differential pressure pick-up 2 is arranged on the installation table top of cushion block 8 by four M5 screws 52,53,54,55.The positive pressure of differential pressure pick-up 2 connects the semicircle draw-in groove 57,58 that root run place that mouth 40 and negative pressures connect mouth 41 is arranged in cushion block 8 both sides; two semicircle clips 59,60 are fastened on draw-in groove 57,58 by four M2.5 screws 61,62,63,64; this design can connect mouth commissure to pressure protection is provided in impact process, improves impact resistance.
For further improving the impact resistance of Venturi tube 1, it is fastening that the present embodiment adopts two clips 9,10 to carry out, and is processed with two symmetrical grooves 24,25 in Venturi tube 1, respectively clip 9,10 is carried out spacing, as shown in Figure 1.
Differential pressure pick-up 2, pressure transducer 3 and temperature sensor 4 by shielded cable 12 be arranged on site environment relatively the integrated converter 11 of good position be connected, by unified temperature compensation and the fusion treatment output analog or digital signal of carrying out of integrated converter 11, each sensor unit is not containing treatment circuit, to improve the environmental suitability of measurement mechanism.
In the present embodiment, sealing in impulse pipeline 5,6,7 and Venturi tube 1 connects between mouth 20,21,22, the forward of impulse pipeline 5,6 and differential pressure pick-up and negative pressures connect between mouth 40 and 41, the pressure of impulse pipeline 7 and pressure transducer 3 connects between mouth 63, and sealing connects the hermetically-sealed construction that all adopts 24 ° of inner cones of standard to coordinate pair bulbs between mouth 23 and temperature sensor 4, by M14 cap nut, carry out fit sealing.Hard sealing structure of the present invention can be selected other standard seal structure according to actual conditions.
In commercial Application, in impulse pipeline, filling liquid carrys out conducting pressure conventionally, and in the severe military operating mode of many vibratory impulse mechanical environments, based on safety perspective, considers, does not allow to adopt liquid to carry out conducting pressure.In the present invention, the pressure guiding pipe of pressure and differential pressure all adopts gas directly to conduct.Conventionally the variation of the static pressure of measured medium is comparatively slow, so the impulse pipeline 7 of pressure transducer 3 can be a little longer, thereby pressure transducer 3 can be arranged on to temperature and the good position of mechanical environment.The differential pressure signal of measuring media changes obviously the variation faster than pressure signal, so the impulse pipeline 5 of differential pressure pick-up 2 and 6 should be as far as possible short, and the length of two impulse pipelines must be consistent as far as possible, measures the impact of accuracy of measurement to reduce tubing effect convection current.On the other hand, to some measured medium temperature operating mode jumpy, impulse pipeline 5 and 6 length can not be too short, if length is too short, cause the sensitive element of differential pressure pick-up to lack necessary temperature buffer, thereby be directly exposed among high and low temperature gas, and then cause the sensitive element generation irreversible change in differential pressure pick-up and affect measuring accuracy.If length is long, the response meeting of pressure is slowed down because of cavity effect.Be response speed and the security feature that definite need of pressure guiding pipe length are taken into account sensitive element.In the present embodiment, two impulse pipelines 5 are identical with 6 length, are between 50-100mm, and optimum length is 70mm, and differential pressure pick-up 2 adopts silicon piezoresistance type pressure reduction sensitive element.
In the present embodiment, consider the material safety issue under oxygen atmosphere, Venturi tube 1, differential pressure pick-up 2, pressure transducer 3, temperature sensor 4, the parts that impulse pipeline 5,6,7 etc. directly contacts with Oxygen Flow all adopt stainless steel material.
Be illustrated in figure 4 differential pressure type flow meter in the present embodiment at pressure medium various operating mode down-off coefficients different with temperature the situation of change with Reynolds number, in figure, can find out that the uncertainty of coefficient of flow is less than 1%, measuring accuracy is higher.Through overtesting, in the present embodiment, flow measurement device can tolerate the shock environment of 4000g and the hot environment of 150 ℃.
Although illustrated and described in detail the preferred embodiments of the present invention, in the situation that do not depart from spirit of the present invention or appended claim scope, can make various modifications, these engineering technical personnel to this area are obviously.For example, over against different measurement ranges or measurement caliber, change the physical dimension of Venturi tube etc.
The content not being described in detail in instructions of the present invention belongs to professional and technical personnel in the field's known technology.
Claims (8)
1. a differential pressure type flow meter, is characterized in that: comprise Venturi tube (1), differential pressure pick-up (2), pressure transducer (3), temperature sensor (4), the first impulse pipeline (5), the second impulse pipeline (6), the 3rd impulse pipeline (7), cushion block (8), the first clip (9), the second clip (10), integrated converter (11) and shielded cable (12), wherein Venturi tube (1) is a machine add-on type, comprises main line (13), two mounting flanges (14, 15), plane boss (16), three six side's boss (17, 18, 19), four sealings connect mouth (20, 21, 22, 23) and two clip stopper slots (24, 25), main line (13) is by two mounting flanges (14 at two ends, 15) be tightly connected with the tested pipeline of the tested pipeline in upstream and downstream respectively, the upper cushion block (8) of installing of plane boss (16), differential pressure pick-up (2) is arranged on cushion block (8), the first sealing connects the forward of mouth (20) by the first impulse pipeline (5) and differential pressure pick-up (2) and seals and connect mouth (40) and be connected, the second sealing connects the negative sense of mouth (21) by the second impulse pipeline (6) and differential pressure pick-up (2) and seals and connect mouth (41) and be connected, the 4th sealing connects mouth (23) and by the 3rd impulse pipeline (7), connects mouth (63) with the sealing of pressure transducer (3) and be connected, the 3rd sealing connects mouth (22) for mounting temperature sensor (4), two clip stopper slots (24,25) carry out respectively spacing to the first clip (9) and the second clip (10), further improve the impact resistance of Venturi tube (1), differential pressure pick-up (2), pressure transducer (3) and temperature sensor (4) are connected with integrated converter (11) by shielded cable (12), by integrated converter (11), carry out uniform data fusion treatment, the bottom of described differential pressure pick-up (2) is arranged on the installation table top of cushion block (8) by screw, and the forward of differential pressure pick-up (2) sealing connects mouth (40) and negative sense and seals the root run place that connects mouth (41) and lay respectively in two semicircle draw-in grooves (57,58) of cushion block (8) both sides, two semicircle clips (59,60) respectively by screw fastening on two semicircle draw-in grooves (57,58).
2. a kind of differential pressure type flow meter according to claim 1, it is characterized in that: described cushion block (8) is by four screws (42,43,44,45) and the fastening plane boss (16) that is arranged on Venturi tube (1) of four flat shims (46,47,48,49), on plane boss (16), be carved with two round rectangle grooves (38,39), two round rectangle pieces (50,51) the formation transition fit corresponding with cushion block (8) bottom respectively, thereby cushion block (8) is carried out spacing, promote impact resistance.
3. a kind of differential pressure type flow meter according to claim 1, it is characterized in that: described main line (13) comprises upstream straight length (26), contraction section (27), throat's straight length (28), divergent section (29) and downstream straight length (30), its middle and upper reaches straight length (26) is consistent with the internal diameter of the tested pipeline in upstream and downstream with the inside diameter D of downstream straight length (30).
4. a kind of differential pressure type flow meter according to claim 3, it is characterized in that: first the six sides boss (17) in described Venturi tube (1) is positioned on upstream straight length (26), second six side's boss (18) is positioned at throat's straight length (28) above, and the 3rd six side's boss (19) are positioned on downstream straight length (30).
5. a kind of differential pressure type flow meter according to claim 1, it is characterized in that: the sealing of first in described the first impulse pipeline (5) and Venturi tube (1) connects between mouth (20), in the second impulse pipeline (6) and Venturi tube (1) second sealing connects between mouth (21), in the 3rd impulse pipeline (7) and Venturi tube (1) the 4th sealing connects between mouth (23), the forward sealing of the first impulse pipeline (5) and differential pressure pick-up (2) connects between mouth (40), the negative sense sealing of the second impulse pipeline (6) and differential pressure pick-up (2) connects between mouth (41), the 3rd impulse pipeline (7) and the sealing of pressure transducer (3) connect between mouth (63) and the 3rd sealing connects the hermetically-sealed construction that all adopts 24 ° of inner cones of standard to coordinate pair bulbs between mouth (22) and temperature sensor (4), by cap nut, carry out fit sealing.
6. a kind of differential pressure type flow meter according to claim 1, it is characterized in that: the length of described the first impulse pipeline (5) and the second impulse pipeline (6) is 50-100mm, and the length of the first impulse pipeline (5) and the second impulse pipeline (6) is consistent.
7. a kind of differential pressure type flow meter according to claim 1, it is characterized in that: described the first impulse pipeline (5), the second impulse pipeline (6) and the 3rd impulse pipeline (7) directly carry out impulse by tested gas medium, without adopting liquid impulse.
8. a kind of differential pressure type flow meter according to claim 1, is characterized in that: described Venturi tube (1) all adopts stainless steel material with impulse pipeline (5,6,7).
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| EP3088850A1 (en) * | 2015-04-27 | 2016-11-02 | Siemens Aktiengesellschaft | Subsea flow meter assembly |
| CN105091956A (en) * | 2015-04-29 | 2015-11-25 | 潍柴动力股份有限公司 | Engine air intake flow measuring device and engine system |
| CN106225862A (en) * | 2016-07-14 | 2016-12-14 | 神华集团有限责任公司 | The simple and direct compensation method of gas flow |
| CN109443459B (en) * | 2018-12-05 | 2024-01-16 | 福建上润精密仪器有限公司 | Throttle device with built-in high-precision sensor |
| CN110906990B (en) * | 2019-11-14 | 2021-05-25 | 天津航空机电有限公司 | Differential pressure type flow temperature sensor structure based on Venturi tube and measuring method |
| CN111241637B (en) * | 2020-01-10 | 2023-05-16 | 瑞大集团有限公司 | Calculation method for inner diameter of flow-limiting pore plate under known working condition and pressure drop requirement |
| CN111351533A (en) * | 2020-04-21 | 2020-06-30 | 中国舰船研究设计中心 | Marine steam flow measuring device and method |
| CN112362116A (en) * | 2020-11-24 | 2021-02-12 | 广东万和新电气股份有限公司 | Smoke exhaust pipe, gas device, testing device and smoke flow testing method thereof |
| CN216972918U (en) * | 2022-02-21 | 2022-07-15 | 南京中竞科智能科技有限公司 | Automatic put in structure and washing equipment |
| CN115371745A (en) * | 2022-10-25 | 2022-11-22 | 中国航空工业集团公司北京长城计量测试技术研究所 | Non-intrusive engine air inlet flow tube based on contraction and expansion throat structure |
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| CN2594770Y (en) * | 2002-11-13 | 2003-12-24 | 卢玖庆 | Throttling differential pressure flowmeter |
| WO2005040732A1 (en) * | 2003-10-27 | 2005-05-06 | Elster-Instromet Ultrasonics B.V. | Wet gas measurement apparatus and method |
| CN201034643Y (en) * | 2007-02-02 | 2008-03-12 | 刘志壮 | Venturi type differential pressure liquid flowmeter |
| CN101017106A (en) * | 2007-02-14 | 2007-08-15 | 大连亨利测控仪表工程有限公司 | Vencore flowmeter |
| CN101382445B (en) * | 2008-09-17 | 2010-08-04 | 天津大学 | Double differential pressure throttle moisture measuring device |
| CN101893461A (en) * | 2010-06-24 | 2010-11-24 | 卢玖庆 | Conical orifice plate flow meter |
| CN101881640A (en) * | 2010-06-30 | 2010-11-10 | 重庆耐德正奇流量仪表有限公司 | Vortex mass flow meter |
| DE102010042344B4 (en) * | 2010-10-12 | 2022-06-23 | Endress+Hauser SE+Co. KG | Differential pressure transducer arrangement for a flow meter and flow meter with such a differential pressure transducer arrangement |
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