CN102735292A - Differential pressure type flow rate measuring device - Google Patents
Differential pressure type flow rate measuring device Download PDFInfo
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- CN102735292A CN102735292A CN2012102018960A CN201210201896A CN102735292A CN 102735292 A CN102735292 A CN 102735292A CN 2012102018960 A CN2012102018960 A CN 2012102018960A CN 201210201896 A CN201210201896 A CN 201210201896A CN 102735292 A CN102735292 A CN 102735292A
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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 the flow measurement field.
Background technology
Flow sensor has important application in the space telemetry field.The continual renovation 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 the industrial circle at present all are difficult to satisfy this mechanical environment is abominable, the significant high speed oxygen airshed of temperature variation measurement requirement.
Summary of the invention
The objective 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; Advantages such as reliability height, easy care can be applied to have under the rugged surroundings all gases mass flow measurement field of high reliability request.
Above-mentioned purpose of the present invention is achieved through following technical scheme:
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, first clip, 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, and main line is tightly connected with the tested pipeline of tested pipeline in the upper reaches and downstream respectively through two mounting flanges at two ends; On the boss of plane cushion block is installed; Differential pressure pick-up then is installed on the cushion block, and first sealing connects the forward sealing of mouth through the first impulse pipeline and differential pressure pick-up and connects mouth and is connected, and second seals and connect the negative sense of mouth through the second impulse pipeline and differential pressure pick-up and seal and connect mouth and be connected; The 4th sealing connects mouth and connects mouth through the 3rd impulse pipeline with the sealing of pressure transducer and be connected, and the 3rd seals and connect mouth and be used for mounting temperature sensor; Two clip stopper slots carry out spacing respectively to first clip and second clip, further improve the impact resistance of Venturi tube; Differential pressure pick-up, pressure transducer and temperature sensor are connected with integrated converter through shielded cable, carry out the uniform data fusion treatment by integrated converter.
In above-mentioned differential pressure type flow meter; The bottom of differential pressure pick-up is installed on the installation table top of cushion block through screw; And the positive pressure of differential pressure pick-up connects two semicircle draw-in grooves that root run place that mouth and negative pressures connect mouth is arranged in the cushion block both sides respectively, and two semicircle clips are fastened on two semicircle draw-in grooves through screw respectively.
In above-mentioned differential pressure type flow meter; Cushion block is through on the fastening plane boss that is installed in Venturi tube of four screws and four flat shims; Be carved with two corresponding with the cushion block bottom respectively round rectangle pieces of two round rectangle grooves on the boss of plane and form transition fit; Thereby cushion block is carried out spacing, promote impact resistance.
In above-mentioned differential pressure type flow meter, main line comprises upper reaches 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 on the Venturi tube are positioned on the straight length of the upper reaches, 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 on impulse pipeline and the Venturi tube connects between the mouth; The positive pressure of impulse pipeline and differential pressure pick-up connects mouth and negative pressures connects between the mouth; Impulse pipeline and the pressure of pressure transducer connect between the mouth and sealing connects the hermetically-sealed construction that 24 ° of inner cones that all adopt standard between mouth and the temperature sensor cooperate pair bulbs, carry out fit sealing through cap nut.
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 through tested gas medium, need not to adopt the 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 installed on the Venturi tube through cushion block, has 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 tested gas medium as the impulse medium again, need not with special liquid has increased the environmental suitability and the impact resistance of this measurement mechanism as the impulse medium;
(2) differential pressure pick-up is installed on the used cushion block and is designed with multiple special position limiting structure in the measurement mechanism of the present invention; Differential pressure pick-up is provided the limit function of three directions; Weld seam interface to differential pressure pick-up both sides pressure-inducing nozzle root provides extra security measure simultaneously, has effectively promoted the impact resistance of measurement mechanism;
(3) Venturi tube comprises main line in the measurement mechanism of the present invention, 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) differential pressure pick-up and pressure transducer connect mouth through impulse pipeline and sealing on the Venturi tube respectively and are connected in the measurement mechanism of the present invention; Temperature sensor is directly installed on sealing and connects on the mouth; Sealing means all adopts the metal hard-sealing structure of standard; Both guarantee sealing property, be convenient to installation and maintenance again;
(5) in the measurement mechanism of the present invention differential pressure pick-up, pressure transducer and temperature sensor all through shielded cable be installed in site environment and be connected than the integrated converter of good position relatively; Carrying out uniform data by integrated converter merges and compensation deals; Each sensor unit does not contain treatment circuit, thereby has improved the environmental suitability of measurement mechanism;
(6) be processed with two symmetrical grooves on the Venturi tube in the measurement mechanism of the present invention and two clips carried out spacing, further improve the impact resistance of Venturi tube;
(7) the present invention has provided first pressure guiding pipe of differential pressure pick-up through a large amount of tests and the optimum length scope of 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, then causes the sensitive element of differential pressure pick-up to lack necessary temperature buffer, thereby directly be exposed among the high and low temperature gas; And then cause the sensitive element generation irreversible change in the differential pressure pick-up and influence measuring accuracy, promptly definite need of pressure guiding pipe length are taken into account the response speed and the security feature of sensitive element;
(8) test show coefficient of flow of the present invention uncertainty less than 1%, reach high-precision measurement standard; In addition, the present invention can tolerate the shock environment of 4000g and 150 ℃ hot environment.
Description of drawings
Fig. 1 is a differential flow measurement mechanism structural representation of the present invention;
Fig. 2 is a differential flow measurement mechanism Venturi tube inner structure synoptic diagram of the present invention;
Fig. 3 is a differential flow measurement mechanism differential pressure pick-up scheme of installation of the present invention;
Fig. 4 for the coefficient of flow of different capacitance flow measurement device of the present invention at change curve with Reynolds number;
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
Differential pressure type flow meter is a kind of throttle type measurement mechanism of weighing the flow size according to pressure reduction according to the 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, and static pressure reduces, thereby meets the mouth place and throat packing meets the pressure differential Δ p that generation is bigger between the mouth place in upstream seal; The venturi differential pressure type flow measurement method is the basis with flow continuity equation (law of conservation of mass) and Bernoulli equation (law of conservation of energy), and its mass flow calculation formula is following:
In the formula, q
mRepresentation unit flows through the fluid mass of pipeline in the time, C representes efflux coefficient, and ε is the expansibility factor of measured medium; C ε is commonly called coefficient of flow, and D representes internal diameter of the pipeline, and β is a throttling diameter ratio; Be throat's inner diameter d and the ratio of internal diameter of the pipeline D, ρ is a Media density.
The concrete measurement operating mode of present embodiment is following: measuring media is an oxygen, and the 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 as differential flow measurement mechanism structural representation of the present invention, can know that by figure 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, first clip 9, second clip 10, integrated converter 11 and shielded cable 12.Venturi tube 1 adopts the high metal material of intensity, and a machine add-on type, differential pressure pick-up 2 adopt high precision silicon pressure resistance type differential pressure sensitive element, and pressure transducer 3 adopts the 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 through tested gas medium oxygen, need not to adopt the liquid impulse.
Be illustrated in figure 2 as the structural representation of Venturi tube of the present invention, can know that by figure Venturi tube 1 comprises main line 13, mounting flange 14,15, 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 upper reaches straight length 26, contraction section 27, throat's straight length 28, divergent section 29, downstream straight length 30.The inside diameter D of upper reaches straight length 26 and downstream straight length 30 is consistent with the internal diameter of tested pipeline; The angle of throat θ of contraction section 27 designs its scope between (21 ± 1) ° according to pipe design specifications GB/T 2624.4 in the mound; The angle of divergence alpha of divergent section 29 designs its scope between (7～15) ° according to pipe design specifications GB/T 2624.4 in the 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 needs 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 seal groove 31 and 32 respectively; Venturi tube 1 is fastened and connected through bolt with the tested pipeline of tested pipeline in the upper reaches and downstream respectively through mounting flange 14,15; The concrete size of seal groove 31,32 and the rubber seal size match of selecting for use; The nominal diameter of bolt and number require to decide according to the installation strength in the actual condition, and each mounting flange is selected 12 M8 bolts for use in the present embodiment.
Be designed with three six side's boss 17,18 and 19 in the present embodiment on the Venturi tube 1.Six side's boss 17 are positioned on the upper reaches 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 the downstream straight length 30.Sealing on the Venturi tube 1 connects mouth 20,21 and lays respectively on six side's boss 17, two table tops identical with 18 directions; Sealing connects the forward of mouth 20 through 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 through 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 connects mouth 63 through the 3rd impulse pipeline 7 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, is positioned at the relative table top that sealing connects the table top of living in of mouth 20 in the present embodiment.Sealing connects mouth 22 and is positioned on six side's boss 19 and connects the identical table top of mouth 20,21 table top directions of living in sealing, is used for mounting temperature sensor 4.Because the temperature variation behind the air-flow process venturi pipeline is very little, during practical implementation, the installation site of temperature sensor 4 both can be installed in the upper reaches, also can be installed in downstream, and in the present embodiment, the sealing that is installed in downstream straight length 30 connects on the mouth 22.
Be illustrated in figure 3 as the scheme of installation of differential pressure type flow meter differential pressure pick-up of the present invention, plane boss 16 is used to install cushion block 8 and differential pressure pick-up 2, and it is installed on the table top and is designed with 4 M5 screws.Cushion block 8 is through on the fastening plane boss 16 that is installed in Venturi tube 1 of 42,43,44,45 and four flat shims of four M5 screws 46,47,48,49.Be carved with two round rectangle grooves 38,39 round rectangle piece corresponding 50,51 on the plane boss 16 and form transition fit, thereby cushion block 8 is carried out spacing, promote impact resistance with cushion block 8 bottoms.
In the present embodiment, the bottom of differential pressure pick-up 2 is installed on the installation table top of cushion block 8 through 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 the draw-in groove 57,58 through four M2.5 screws 61,62,63,64; This design can connect the mouth commissure to pressure protection is provided in impact process, improve impact resistance.
For further improving the impact resistance of Venturi tube 1, it is fastening that present embodiment adopts two clips 9,10 to carry out, and is processed with two symmetrical grooves 24,25 on the Venturi tube 1, carries out spacing, as shown in Figure 1 to clip 9,10 respectively.
Differential pressure pick-up 2, pressure transducer 3 and temperature sensor 4 through shielded cable 12 be installed in site environment and be connected than the integrated converter 11 of good position relatively; By integrated converter 11 unified temperature compensation and the fusion treatment output analog or digital signals of carrying out; Each sensor unit does not contain treatment circuit, to improve the environmental suitability of measurement mechanism.
In the present embodiment; Sealing on impulse pipeline 5,6,7 and the Venturi tube 1 connects mouth 20,21, between 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 the mouth 63, and sealing connects the hermetically-sealed construction that 24 ° of inner cones that all adopt standard between mouth 23 and the temperature sensor 4 cooperate pair bulbs, carries out fit sealing through the M14 cap nut.Hard sealing structure of the present invention can be selected other standard seal structure for use according to actual conditions.
In commercial Application, common filling liquid comes conducting pressure in the impulse pipeline, and in the abominable military operating mode of many vibratory impulse mechanical environments, considers based on safety perspective, does not allow to adopt liquid to come conducting pressure.Among the present invention, the pressure guiding pipe of pressure and differential pressure all adopts gas directly to conduct.Usually the static pressure of measured medium changes comparatively slowly, so the impulse pipeline 7 of pressure transducer 3 can be a little longer, thereby can pressure transducer 3 be installed in temperature and mechanical environment position preferably.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 lacked as far as possible, and the length of two impulse pipelines must be consistent as far as possible, to reduce the influence of tube chamber effect convection current measurement accuracy of measurement.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, then cause the sensitive element of differential pressure pick-up to lack necessary temperature buffer; Thereby directly be exposed among the high and low temperature gas, and then cause the sensitive element generation irreversible change in the differential pressure pick-up and influence 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.Two impulse pipelines 5 are identical with 6 length in the present embodiment, are between the 50-100mm, and optimum length is 70mm, and differential pressure pick-up 2 adopts silicon piezoresistance type pressure reduction sensitive elements.
In the present embodiment, consider the material safety property problem under the oxygen atmosphere, Venturi tube 1, differential pressure pick-up 2, pressure transducer 3, temperature sensor 4, impulse pipeline 5,6,7 etc. all adopts stainless steel material with the direct parts in contact of Oxygen Flow.
Be illustrated in figure 4 as differential pressure type flow meter in the present embodiment in the situation of change of pressure medium various operating mode down-off coefficients different with temperature with Reynolds number, the uncertainty that can find out coefficient of flow among the figure is less than 1%, and measuring accuracy is higher.Through overtesting, flow measurement device can tolerate the shock environment of 4000g and 150 ℃ hot environment in the present embodiment.
Although specified and described the preferred embodiments of the present invention, under the situation that does not break away 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 of not doing to describe in detail in the instructions of the present invention belongs to this area professional and technical personnel's known technology.
Claims (9)
1. differential pressure type flow meter; It 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), first clip (9), second clip (10); Integrated converter (11) and shielded cable (12); Wherein Venturi tube (1) is a machine add-on type; Comprise 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), and main line (13) is tightly connected with the tested pipeline of tested pipeline in the upper reaches and downstream respectively through two mounting flanges (14,15) at two ends; Plane boss (16) is gone up cushion block (8) is installed; Differential pressure pick-up (2) then is installed on the cushion block (8), and first sealing connects the forward sealing of mouth (20) through the first impulse pipeline (5) and differential pressure pick-up (2) and connects mouth (40) and be connected, and second seals and connect the negative sense of mouth (21) through the second impulse pipeline (6) and differential pressure pick-up (2) and seal and connect mouth (41) and be connected; The 4th sealing connects mouth (23) and connects mouth (63) through the 3rd impulse pipeline (7) with the sealing of pressure transducer (3) and be connected, and the 3rd seals and connect mouth (22) and be used for mounting temperature sensor (4); Two clip stopper slots (24,25) carry out spacing respectively to first clip (9) and 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) through shielded cable (12), carry out the uniform data fusion treatment by integrated converter (11).
2. a kind of differential pressure type flow meter according to claim 1; It is characterized in that: the bottom of said differential pressure pick-up (2) is installed on the installation table top of cushion block (8) through screw; And the positive pressure of differential pressure pick-up (2) connects two semicircle draw-in grooves (57,58) that root run place that mouth (40) and negative pressures connect mouth (41) is arranged in cushion block (8) both sides respectively, and two semicircle clips (59,60) are fastened on two semicircle draw-in grooves (57,58) through screw respectively.
3. a kind of differential pressure type flow meter according to claim 1; It is characterized in that: said cushion block (8) is through on the fastening plane boss (16) that is installed in Venturi tube (1) of four screws (42,43,44,45) and four flat shims (46,47,48,49); Be carved with corresponding with cushion block (8) bottom respectively two the round rectangle pieces (50,51) of two round rectangle grooves (38,39) on the plane boss (16) and form transition fit; Thereby cushion block (8) is carried out spacing, promote impact resistance.
4. a kind of differential pressure type flow meter according to claim 1; It is characterized in that: said main line (13) comprises upper reaches 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).
5. a kind of differential pressure type flow meter according to claim 4; It is characterized in that: six side's boss (17) on the said Venturi tube (1) are positioned on the upper reaches straight length (26); Six side's boss (18) are positioned on throat's straight length (28), and six side's boss (19) are positioned on the downstream straight length (30).
6. a kind of differential pressure type flow meter according to claim 1; It is characterized in that: the sealing on said impulse pipeline (5,6,7) and the Venturi tube (1) connects between the mouth (20,21,22); The positive pressure of impulse pipeline (5,6) and differential pressure pick-up (2) connects mouth (40) and negative pressures connects between the mouth (41); Impulse pipeline (7) and the pressure of pressure transducer (3) connect between the mouth (63) and sealing connects the hermetically-sealed construction that 24 ° of inner cones that all adopt standard between mouth (23) and the temperature sensor (4) cooperate pair bulbs, carry out fit sealing through cap nut.
7. a kind of differential pressure type flow meter according to claim 1 is characterized in that: the length of the said 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.
8. a kind of differential pressure type flow meter according to claim 1 is characterized in that: the said first impulse pipeline (5), the second impulse pipeline (6) and the 3rd impulse pipeline (7) directly carry out impulse through tested gas medium, need not to adopt the liquid impulse.
9. a kind of differential pressure type flow meter according to claim 1 is characterized in that: said Venturi tube (1), differential pressure pick-up (2), pressure transducer (3), temperature sensor (4) all adopt stainless steel material with impulse pipeline (5,6,7).
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