CN105865544B - The symmetrical damp type flow sensor of double-piston and its detection method - Google Patents

The symmetrical damp type flow sensor of double-piston and its detection method Download PDF

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Publication number
CN105865544B
CN105865544B CN201610367052.1A CN201610367052A CN105865544B CN 105865544 B CN105865544 B CN 105865544B CN 201610367052 A CN201610367052 A CN 201610367052A CN 105865544 B CN105865544 B CN 105865544B
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piston
fluid
laser arrays
partition
piston cylinder
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CN105865544A (en
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胡浩
钟丽琼
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Guizhou University
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Guizhou University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure

Abstract

The present invention provides a kind of symmetrical damp type flow sensor of double-piston and its detection method, sensor probe includes piston cylinder and detection case, it is closed respectively by end cap at the both ends of piston cylinder, partition is provided in the middle part of piston cylinder, it slides respectively and is provided with a piston in partition two sides, spring is provided between piston and end cap, probe placement hole is offered on end cap, fiber laser arrays end is provided in probe placement hole, reflecting part is provided at face fiber laser arrays end on piston, two chambers between partition and two pistons pass through a fluid passage respectively and are connected with detection case, fluid passage and gas source are respectively arranged at fluid in the opposite sides of detection case internal flow path.It is mostly used in a manner of traditional dynamometry by solving existing flow sensor, possesses the limitations such as measurement accuracy is not high, energy consumption is big, the problem that cannot be competent at well in many occasions.The invention belongs to field of flow detection.

Description

The symmetrical damp type flow sensor of double-piston and its detection method
Technical field
The present invention relates to a kind of flow sensors, belong to flow sensing monitoring technical field.
Background technique
During modern industrial production especially automated production, it is often required to that production is monitored and controlled with various sensors Parameters in the process make equipment work in normal condition or optimum state, and product are made to reach best quality.Sensor Also such as industrial production, space development, hydrospace detection, environmental protection, resource investigation, medical diagnosis, biological work are penetrated into already The extremely general field of journey, even historical relic's protection etc..The present invention is one of sensor --- the flow sensor of numerous classifications. With the development of sensor technology, diversified flow sensor is had already appeared at present, it is most common to have vane type, vortex street Formula, toll bar vortex, hot-wire etc..But the sensors such as vane type, eddy currents, toll bar vortex, hot-wire, principle Traditional dynamometry mode is mostly used, possesses the limitations such as measurement accuracy is not high, energy consumption is big, cannot win well in many occasions Appoint.
Summary of the invention
It is an object of the invention to: a kind of symmetrical damp type flow sensor of double-piston and its detection method are provided, with solution Certainly existing flow sensor mostly uses traditional dynamometry mode, possesses the limitations such as measurement accuracy is not high, energy consumption is big, very much The problem that occasion cannot be competent at well.
The solution of the present invention is as follows: a kind of symmetrical damp type flow sensor of double-piston, including sensor probe, photoelectricity turn Parallel operation and signal processor, sensor probe include piston cylinder and the detection case for being set to piston cylinder side, the both ends of piston cylinder Closed respectively by end cap, the medium position of piston cylinder be provided with by piston cylinder inner sealing be divided into left and right two chambers every Plate, sliding is provided with a piston respectively in the piston cylinder of partition two sides, is provided between piston and the end cap of its side One end of spring, spring is fixed on piston, and the other end is fixed on end cap, and probe peace is offered on the end cap at the both ends Hole is set, fiber laser arrays end is provided in each probe placement hole, is provided with reflecting part at face fiber laser arrays end on piston, The fiber optic bundle at fiber laser arrays end is formed by incident optical and the output optical fiber set armouring, the output optical fiber and photoelectricity at fiber laser arrays end Converter is connected, and photoelectric converter is connected with signal processor, can determine whether by the variation of the output optical fiber received signal anti- The variation of distance between light component and fiber laser arrays end, to judge the pressure difference into the fluid of piston two sides;
The inside of detection case is enabled flow across on detection case with fluid inlet and fluid outlet, in piston cylinder partition with Two chambers between two pistons pass through a fluid passage respectively and are connected with detection case, further include gas source, the confession of gas source The middle position of two fluid passages is directed toward in gas direction, and fluid passage and gas source are respectively arranged at fluid in detection case inside stream The opposite sides of path, so set, flowing into the Fluid pressure of two side cavity of partition when the fluid in detection case does not circulate Should be identical, then the sliding distance of two pistons is identical, and after fluid flowing, the Fluid pressure for flowing into two side cavity of partition is Different, then the sliding distance of two pistons is different, and the optical signal that this pressure change will be reflected in fibre-optical probe detection becomes In change, i.e., the information such as fluid flow are detected by the sensor.
The circulating direction of fluid is perpendicular in the jet direction and detection case of gas source.
It further include having light source, Y type coupler and optical fiber, light source is set to one end of optical fiber for generating fiber-optic signal, light The fine other end is divided into detection fiber and reference optical fiber, the combination of above-mentioned light source, Y type coupler and optical fiber after Y type coupler Two groups are shared, the detection fiber in two groups of said combinations accesses the fiber laser arrays end at sensor probe both ends correspondingly, and As the incident optical at fiber laser arrays end, the reference optical fiber in two groups of said combinations is individually connected with a photoelectric conversion Device, and photoelectric converter is connected with signal processor.The optical signal that light source issues is coupled into optical fiber, then passes through Y type Coupler is divided into two-way, reaches fiber laser arrays end through detection fiber all the way, is irradiated on reflecting part, reflected light after reflection Into reception optical fiber, photoelectric converter is transferred to by reception optical fiber and carries out photoelectric conversion, then input a signal into signal processor into Row signal processing;Another way is transmitted directly to also enter into signal processing after photoelectric converter carries out photoelectric conversion through reference optical fiber Device carries out signal processing, and when the fluid in the test chamber of the piston left and right sides is there are when pressure difference, two sides damping spring is pressed at this time The length of contracting is different, and the axial displacement that piston generates is also different.Therefore, sensor two sides fiber laser arrays end and reflecting part away from From will be unequal, so that the output optical signal intensity of reception optical fiber differs in two fiber laser arrays ends, through photoelectric conversion and signal Output valve size after processing calculates can reflect that the pressure difference size of cavity fluid is detected in two sides;
In sensor probe, partition is an integral structure with piston cylinder or bulkhead seal is fixed in piston cylinder;
It is logical positioned at the chamber of partition two sides, two pistons, two springs and two fluids of partition two sides in piston cylinder Road is symmetrical arranged both with respect to partition, and filter screen is provided on fluid passage.
For the sensing effect for guaranteeing fibre-optical probe, more accurate, end cap where two probe placement holes are provided with is detected Center position, two probe placement holes, two pistons and spring be coaxially disposed, the specification of two pistons and two springs And performance is identical, reflecting part is vertically arranged with fiber laser arrays end, and reflecting part is reflective mirror or reflecting piece, nature Under, the distance of reflecting part corresponding to one of fiber laser arrays end to the fiber laser arrays end is arrived with another fiber laser arrays end The distance at another fiber laser arrays end is identical, is provided with piston seal between piston and the inner wall of piston cylinder, to prevent from living The fluid of plug two sides penetrates into mutually;
Light transmitting sheet is additionally provided between fiber laser arrays end and reflecting part, light transmitting sheet is sheet glass, and light transmitting sheet is all set in Two probe placement holes are located at the port on the inside of two end caps, and are set at the port for placement hole of popping one's head in by light transmitting sheet closing It sets.
As preferred structure, the fiber laser arrays end by screw thread be tightened in probe placement hole in, to guarantee light Fibre probe positions secured and accurate;
Utilize the method for the sensor detection fluid flow, comprising:
If flowing in detection case without detected fluid, two are formed by two chambers in piston cylinder between piston and partition Interior Fluid pressure be it is identical, the sliding distance of two pistons is identical, and fiber laser arrays end detects that two chamber pressure differences are zero;If There is detected fluid flowing in detection case, starting gas source blows to form air-flow, then with air-flow phase occurs in detection case for detected fluid Interaction, so that the initial momentum of detected fluid and air-flow changes, fluid shifts in detection case, lives so that entering The fluid-mixing of plug cylinder forms pressure difference in the two sides of partition, and the skidding distance of one side piston of high pressure is big, therefore, high pressure side Fiber laser arrays end and the distance of reflecting part are smaller, thus, the output valve size after photoelectric conversion and signal processing calculate is The pressure difference size that can reflect two sides detection cavity fluid, resettles momentum pressure difference mathematical model, and reckoning obtains fluid momentum;
The momentum pressure difference mathematical model is as follows: the relationship between analysis transmission amount and pressure difference, if the speed of air-flow is Vs, The speed of detected fluid is V, wherein VsThe air velocity emitted by gas source, be known quantity, piston both ends pressure difference with The momentum M of two fluidss/ M is related, and wherein M is detected fluid momentum, MsFor air-flow momentum, respectively withWith V2It is directly proportional.
M=kV2
K is constant;
That is:
Then:
Wherein, k1For known quantity, to can acquire the value of V after known Δ P, in test, we take VsEqual to 5m/ S takes k1=2, V change by 1m/s to 2m/s, and curve is as described in Figure 4.
The circulating direction of fluid is perpendicular in the jet direction and detection case of gas source.
Compared with prior art, the present invention major advantage is as follows: can by structure design, theoretical research and experimental analysis Know, which has lesser structure, higher accuracy and reliability, well adapting to property and interchangeability etc., the sensing Device can be suitably used for numerous fluid flow detection occasions, photoelectric sensing principle is applied to field of flow detection, output signal is through light Output valve will change at double after electricity conversion and signal processing calculate, to improve detection sensitivity, have highly important reality Border application value plays great impetus to the design and popularization of novel flow rate sensor.
Meanwhile the differential pressure pick-up uses piston cylinder operator as pressure detection device, has pressure difference in two side liquids When, piston is translational motion, it is only necessary to can calculate fluid pressure differential according to the translational movement of piston, the requirement for Fibre Optical Sensor It is lower, measure and calculate more simple, and piston structure is more stable, not vulnerable to external interference, is hardly damaged, and service life is more To be permanent, so that the reliability of sensor, adaptability and interchangeability have the survey for being suitable for use as fluid flow compared with much progress Amount;The intensity compensation principle of sensor is more simple, and practicability is stronger.
Detailed description of the invention
Fig. 1 is the systematic schematic diagram of the sensor;
Fig. 2 is the cross-sectional view of the sensor probe configuration;
Fig. 3 is detection principle diagram;
Fig. 4 is the relationship of fluid momentum Yu piston both sides pressure difference.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below with reference to accompanying drawings Step ground detailed description,
Embodiment:
Referring to figs. 1 to Fig. 4, the present embodiment provides a kind of symmetrical damp type flow sensors of double-piston, including sensor to visit First 1, photoelectric converter 2 and signal processor 3, sensor probe 1 include piston cylinder 11 and the inspection for being set to 11 side of piston cylinder Measuring tank 12, the both ends of piston cylinder 11 are closed by end cap 13 respectively, and the medium position of piston cylinder 11 is provided with will be inside piston cylinder 11 Sealed separation is the partition 14 of left and right two chambers, and partition 14 is an integral structure with piston cylinder 11, the piston of 14 two sides of partition Sliding is provided with a piston 15 respectively in cylinder 11, is provided with spring 16, bullet between piston 15 and the end cap 13 of its side One end of spring 16 is fixed on piston 15, and the other end is fixed on end cap 13, offers probe on the end cap 13 at the both ends Placement hole 17 is provided with fiber laser arrays end 19 in each probe placement hole 17, sets at face fiber laser arrays end 19 on piston 15 It is equipped with reflecting part 18, light transmitting sheet 131 is additionally provided between fiber laser arrays end 19 and reflecting part 18, light transmitting sheet 131 is glass Piece, light transmitting sheet 131 is all set in two probe placement holes 17 and is located at the port of two end caps, 13 inside, and placement hole 17 of popping one's head in Port at by the closing setting of light transmitting sheet 131, the fiber optic bundle at fiber laser arrays end 19 gathered by incident optical and the output optical fiber 191 Armouring forms, and the output optical fiber 191 at fiber laser arrays end 19 is connected with photoelectric converter 2, photoelectric converter 2 and signal processor 3 It is connected, positioned at two of the chamber of 14 two sides of partition, two pistons, 15, two springs 16 and 14 two sides of partition in piston cylinder 11 Fluid passage 123 is symmetrical arranged both with respect to partition 14, and filter screen 125, two probe placements are provided on fluid passage 123 The center position of end cap 13 where hole 17 is provided with, two probe placement holes, 17, two pistons 15 and spring 16 are coaxial The specification and performance of setting, two pistons 15 and two springs 16 are identical, and reflecting part 18 is vertical with fiber laser arrays end 19 Setting, reflecting part 18 are reflective mirror or reflecting piece, and under natural conditions, the fiber laser arrays end is arrived at one of fiber laser arrays end 19 The phase at a distance from another fiber laser arrays end 19 to another fiber laser arrays end 19 of the distance of reflecting part 18 corresponding to 19 Together, piston seal 151 is provided between piston 15 and the inner wall of piston cylinder 11.
Have fluid inlet 121 and fluid outlet 122 to enable flow across the inside of detection case 12, piston on detection case 12 Two chambers in cylinder 11 between partition 14 and two pistons 15 pass through a fluid passage 123 respectively and are connected with detection case 12 It is logical, it further include gas source 124, the middle position of two fluid passages 123, and fluid passage 123 are directed toward in the gas supply direction of gas source 124 Fluid is respectively arranged in the opposite sides of 12 internal flow path of detection case, the jet direction and inspection of gas source 124 with gas source 124 The circulating direction of fluid is perpendicular in measuring tank 12;
One end that light source 4 is set to optical fiber 6 is divided after Y type coupler 5 for generating fiber-optic signal, the other end of optical fiber 6 For detection fiber 61 and reference optical fiber 62, the combination of above-mentioned light source 4, Y type coupler 5 and optical fiber 6 shares two groups, two groups above-mentioned group Detection fiber 61 in conjunction accesses the fiber laser arrays end 19 at 1 both ends of sensor probe correspondingly, and as fiber laser arrays end 19 incident optical, the reference optical fiber 62 in two groups of said combinations is individually connected with a photoelectric converter 2, and photoelectricity turns Parallel operation 2 is connected with signal processor 3.
Utilize the method for the sensor detection fluid flow, comprising:
If being flowed in detection case 12 without detected fluid, it is formed by between two pistons 15 and partition 14 in piston cylinder 11 Fluid pressure in two chambers be it is identical, the sliding distance of two pistons 15 is identical, and fiber laser arrays end 19 detects two chambers Chamber pressure difference is zero;If there is detected fluid flowing in detection case 12, the starting air blowing of gas source 124 forms air-flow, then detected fluid and gas Stream interacts in detection case 12, so that the initial momentum of detected fluid and air-flow changes, fluid is in detection case It shifts in 12, so that the fluid-mixing into piston cylinder 11 forms pressure difference, one side piston of high pressure in the two sides of partition 14 15 skidding distance is big, and therefore, the fiber laser arrays end 19 of high pressure side and the distance of reflecting part 18 are smaller, thus, through photoelectricity Output valve size after conversion and signal processing calculate can reflect that the pressure difference size of cavity fluid is detected in two sides, resettle dynamic Pressure difference mathematical model is measured, reckoning obtains fluid momentum.

Claims (6)

1. a kind of symmetrical damp type flow sensor of double-piston, it is characterised in that: including sensor probe (1), photoelectric converter (2) and signal processor (3), sensor probe (1) include piston cylinder (11) and the detection case for being set to piston cylinder (11) side (12), the both ends of piston cylinder (11) are closed by end cap (13) respectively, and the medium position of piston cylinder (11) is provided with piston cylinder (11) inner sealing is divided into the partition (14) of left and right two chambers, slides and sets respectively in the piston cylinder (11) of partition (14) two sides It is equipped with a piston (15), is provided with spring (16) between the end cap (13) of piston (15) and its side, spring (16) One end is fixed on piston (15), and the other end is fixed on end cap (13), and probe peace is offered on the end cap 13 at the both ends It sets hole (17), is provided with fiber laser arrays end (19) in each probe placement hole (17), face fiber laser arrays end on piston (15) (19) it is provided at reflecting part (18), the fiber optic bundle of fiber laser arrays end (19) is gathered by incident optical and the output optical fiber (191) Armouring forms, and the output optical fiber (191) of fiber laser arrays end (19) is connected with photoelectric converter (2), photoelectric converter (2) and signal Processor (3) is connected;Have fluid inlet (121) and fluid outlet (122) to enable flow across detection case on detection case (12) (12) inside, it is logical that the two chambers in piston cylinder (11) between partition (14) and two pistons (15) pass through a fluid respectively Road (123) is connected with detection case (12), further includes gas source (124), and two fluid passages are directed toward in the gas supply direction of gas source (124) (123) middle position, and fluid passage (123) and gas source (124) are respectively arranged at fluid in detection case (12) internal circulation The opposite sides in path;The jet direction of gas source (124) and the circulating direction of detection case (12) interior fluid are perpendicular;It further include having Light source (4), Y type coupler (5) and optical fiber (6), light source (4) are set to one end of optical fiber (6) for generating fiber-optic signal, optical fiber (6) the other end is divided into detection fiber (61) and reference optical fiber (62), above-mentioned light source (4), the coupling of Y type after Y type coupler (5) The combination of device (5) and optical fiber (6) shares two groups, and the detection fiber (61) in two groups of said combinations accesses sensor correspondingly It pops one's head in the fiber laser arrays end (19) at (1) both ends, and the incident optical as fiber laser arrays end (19), the ginseng in two groups of said combinations Examine optical fiber (62) and be individually connected with a photoelectric converter (2), and photoelectric converter (2) with signal processor (3) phase Even;Detection method is as follows: if being flowed in detection case (12) without detected fluid, two pistons (15) and partition in piston cylinder (11) (14) Fluid pressure being formed by between in two chambers be it is identical, the sliding distance of two pistons (15) is identical, optical fiber Test side (19) detects that two chamber pressure differences are zero;If there is detected fluid flowing in detection case (12), starting gas source (124) is blown Air-flow is formed, then detected fluid and air-flow interact in detection case (12), so that detected fluid and air-flow is initial Momentum changes, and fluid shifts in the detection case (12), thus into piston cylinder (11) fluid-mixing in partition (14) two sides form pressure difference, and the skidding distance of one side piston of high pressure (15) is big, therefore, the fiber laser arrays end of high pressure side (19) smaller with the distance of reflecting part (18), thus, the output valve size after photoelectric conversion and signal processing calculate The pressure difference size for reflecting two sides detection cavity fluid, resettles momentum pressure difference mathematical model, and reckoning obtains fluid momentum.
2. the symmetrical damp type flow sensor of a kind of double-piston according to claim 1, it is characterised in that: sensor probe (1) in, partition (14) is an integral structure with piston cylinder (11) or partition (14) is sealingly fastened in piston cylinder (11).
3. the symmetrical damp type flow sensor of a kind of double-piston according to claim 1, it is characterised in that: in piston cylinder (11) It is logical positioned at the chamber of partition (14) two sides, two pistons (15), two springs (16) and two fluids of partition (14) two sides Road (123) is symmetrical arranged both with respect to partition (14), and filter screen (125) are provided on fluid passage 123.
4. the symmetrical damp type flow sensor of a kind of double-piston according to claim 1, it is characterised in that: two probe placements The center position of end cap (13), two probe placement holes (17), two pistons (15) and spring where hole (17) is provided with (16) be coaxially disposed, the specification and performance of two pistons (15) and two springs (16) are identical, reflecting part (18) with Fiber laser arrays end (19) is vertically arranged, and reflecting part (18) is reflective mirror or reflecting piece, under natural conditions, one of optical fiber inspection The distance for surveying reflecting part (18) corresponding to end (19) to the fiber laser arrays end (19) is arrived with another fiber laser arrays end (19) The distance at another fiber laser arrays end (19) is identical, is provided with piston seal between piston (15) and the inner wall of piston cylinder (11) It encloses (151).
5. the symmetrical damp type flow sensor of a kind of double-piston according to claim 1, it is characterised in that: fiber laser arrays end (19) it is additionally provided between reflecting part 18 light transmitting sheet (131), light transmitting sheet (131) is sheet glass, and light transmitting sheet (131) is respectively provided with At two ports that placement hole (17) are located on the inside of two end caps (13) of popping one's head in, and pass through at the port of probe placement hole (17) Light transmitting sheet (131) closing setting.
6. the symmetrical damp type flow sensor of a kind of double-piston according to claim 1, it is characterised in that: the momentum pressure difference Mathematical model is as follows: the relationship between analysis transmission amount and pressure difference, if the speed of air-flow is Vs, the speed of detected fluid is V, Middle VsIt is the air velocity emitted by gas source (124), is known quantity, the momentum M of piston both ends pressure difference and two fluidss/ M is related, and wherein M is detected fluid momentum, MsFor air-flow momentum, respectively withWith V2It is directly proportional;
M=kV2
K is constant;
That is:
Then:
Wherein, k1For known quantity, so that the value of V can be acquired after known Δ P.
CN201610367052.1A 2016-05-30 2016-05-30 The symmetrical damp type flow sensor of double-piston and its detection method Active CN105865544B (en)

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