CN205785358U

CN205785358U - A kind of sensor probe of fiber laser arrays fluid flow

Info

Publication number: CN205785358U
Application number: CN201620504450.9U
Authority: CN
Inventors: 钟丽琼; 胡浩
Original assignee: Guizhou University
Current assignee: Guizhou University
Priority date: 2016-05-30
Filing date: 2016-05-30
Publication date: 2016-12-07
Anticipated expiration: 2026-05-30

Abstract

This utility model provides the sensor probe of a kind of fiber laser arrays fluid flow, including piston cylinder and the detection case being arranged at piston cylinder side, the two ends of piston cylinder are closed by end cap respectively, slide in piston cylinder and be provided with piston, spring it is respectively provided with between piston and the end cap at two ends, one end of spring is fixed on piston, the other end is fixed on end cap, the two ends of piston are also respectively provided with reflecting piece, detection through hole is all offered on the end cap at two ends, it is provided with, in detection through hole, the fiber laser arrays end pointing to reflecting piece, detection case is connected by a fluid passage respectively with the chamber of piston both sides, fluid passage and source of the gas are respectively arranged at the fluid opposite sides at detection case internal flow path.To solve, existing flow transducer probe uses traditional dynamometry mode, has the limitations such as certainty of measurement is the highest, power consumption is big, in the problem that a lot of occasions can not be competent at well.This utility model belongs to field of flow detection.

Description

A kind of sensor probe of fiber laser arrays fluid flow

Technical field

This utility model relates to a kind of flow transducer probe, belongs to flow sensing monitoring technical field.

Background technology

During modern industry produces especially automated production, it is often required to monitor with various sensors and control Parameters in production process, makes equipment be operated in normal condition or optimum state, and makes product reach best Quality.Sensor penetrate into the most already such as commercial production, space development, marine exploration, environmental conservation, The field that resource investigation, medical diagnosis, biological engineering, even historical relic's protection etc. are the most general.This practicality is new Type is one of the sensor of numerous classification flow transducer.Along with the development of sensor technology, the most Diversified flow transducer occur, the most frequently used have that vane type, eddy currents, karman vortex be rotating, hot wire type Deng.But, the sensor such as such as vane type, eddy currents, rotating, the hot wire type of karman vortex, use of principle passes more The dynamometry mode of system, has the limitations such as certainty of measurement is the highest, power consumption is big, can not be well in a lot of occasions Competent.

Summary of the invention

The purpose of this utility model is: provide the sensor probe of a kind of fiber laser arrays fluid flow, to solve The dynamometry mode that the many employings of existing flow transducer are traditional, has the limitations such as certainty of measurement is the highest, power consumption is big, In the problem that a lot of occasions can not be competent at well.

Scheme of the present utility model is as follows: the sensor probe of a kind of fiber laser arrays fluid flow, including piston cylinder Be arranged at the detection case of piston cylinder side, the two ends of piston cylinder are closed by end cap respectively, and sliding in piston cylinder sets Being equipped with piston, be respectively provided with spring between piston and the end cap at two ends, one end of spring is fixed on piston, another End is fixed on end cap, and the two ends of piston are also respectively provided with reflecting piece, and the end cap at two ends all offers detection Through hole, is provided with, in detection through hole, the fiber laser arrays end pointing to reflecting piece, and the fibre bundle of fiber laser arrays end is by entering Penetrating optical fiber and outgoing optical fiber set armouring forms, the incident optical other end docks with light source, in order to couple incident illumination, The exit end of outgoing optical fiber is connected with light-sensitive element, output light intensity signal, by outgoing optical fiber received signal Power i.e. can determine whether the distance between reflecting piece and fiber laser arrays end, thus calculate the sliding distance of piston, i.e. The pressure reduction of the fluid entering piston both sides can be extrapolated further；

There is fluid intake and fluid issuing to enable flow across the inside of detection case, detection case and work on detection case In plug cylinder, the chamber of piston both sides is connected by a fluid passage respectively, also includes source of the gas, the supply of source of the gas The centre position of two fluid passages is pointed in direction, and fluid passage and source of the gas are respectively arranged at fluid at detection case The opposite sides of internal flow path, is arranged such, and when the fluid in detection case does not circulates, flows into piston two The fluid pressure of side cavity should be identical, then piston can be in equilbrium position keep constant, and when fluid flowing after, The fluid pressure flowing into piston two side cavity is different, then piston can slide, and the change of this pressure will It is reflected in the change in optical signal of fibre-optical probe detection, i.e. detects the information such as fluid flow by this sensor.

In order to avoid the spring impact on sensor, the spring of piston both sides is symmetrical arranged, and the bullet of piston both sides Structure and the specification of spring are the most identical, when piston is positioned at the centre position of two ends end cap, and the bullet of piston both sides Spring is in naturalness, i.e. spring tensionless winkler foundation and compressive deformation；

For ensureing the sensing effect of fibre-optical probe, it is ensured that the distance between two ends fiber laser arrays end and reflecting piece is put down Weighing apparatus, two detection through holes are all opened in the center position of place end cap, and two detection through holes and piston are the most coaxial Arranging, reflecting piece is vertically arranged with fiber laser arrays end, ties for slipper seal formula between piston and the inwall of piston cylinder Structure, to prevent the fluid of piston both sides from penetrating into mutually, the inner side being positioned at fiber laser arrays end in detection through hole also sets up Have between the inwall of sealed light-transmitting sheet, i.e. sealed light-transmitting sheet and detection through hole to seal and arrange, prevent fluid contamination light Fine test side；

As preferred structure, one end of described fiber laser arrays end is tightened in detection through hole by screw thread, To ensure the firm and accurate of fibre-optical probe location, end cap is rubber stopper, it is ensured that tie on the premise of structural reliability Structure more simplifies；

For ensureing the sealing effectiveness of piston, prevent fluid from flowing into spring place chamber, piston and work through piston ridge It is provided with piston packing between the inwall of plug cylinder；

For ensureing service life and using effect, the preferred hard alloy of material of piston of sensor；

For preventing the impurity in fluid from entering sensor probe, described fluid passage is provided with filter screen.

Described momentum pressure reduction mathematical model is as follows: analyze the relation between transmission amount and pressure reduction, if the speed of air-flow For V_s, the speed of detected fluid is V, wherein V_sIt is the air velocity emitted by source of the gas, for known quantity, The momentum M of piston two ends pressure difference and two fluids_s/ M is relevant, and wherein M is detected fluid momentum, M_sFor Air-flow momentum, respectively withWith V²It is directly proportional；

M=kV²；

K is constant；

That is:

Then:

Wherein, k₁For known quantity, thus can try to achieve the value of V after known Δ P, in test, we take V_s Equal to 5m/s, take k₁=2, V change by 1m/s to 2m/s, and its curve is as described in Figure 3.

The blowing direction of source of the gas is perpendicular with fluid circulating direction in detection case.

Compared with prior art, major advantage is as follows for this utility model: through structure design, theoretical research and reality Testing analysis to understand, this sensor probe has less structure, higher degree of accuracy and reliability, the suitableeest Ying Xingyu interchangeability etc., this sensor probe can be suitably used for numerous fluid flow detection occasion, and photoelectric sensing is former Ought to be used for field of flow detection, output signal output valve after opto-electronic conversion and signal processing calculate will become at double Change, thus improve detection sensitivity, there is highly important actual application value, to Novel flow rate sensor The design of probe and popularization serve great impetus.

Meanwhile, this differential pressure pick-up probe uses piston cylinder operator as pressure detection device, has at two side liquids When having pressure differential, piston is translational motion, it is only necessary to can calculate fluid pressure differential according to the translational movement of piston, Requirement for Fibre Optical Sensor is lower, calculates and measure the simplest, and piston structure is more stable, is susceptible to External interference, is hardly damaged, and service life is the most permanent so that the reliability of sensor probe, adaptability and Interchangeability has had relatively much progress, is suitable for use as the measurement of fluid flow；The intensity compensation principle of sensor probe The simplest, practicality is higher.

Accompanying drawing explanation

Fig. 1 is the sectional view of this sensor probe configuration；

Fig. 2 is Cleaning Principle figure；

Fig. 3 is the relation of fluid momentum and piston both sides pressure difference.

Detailed description of the invention

For making the purpose of this utility model, technical scheme and advantage clearer, below with reference to accompanying drawings to this reality It is described in further detail with novel,

Embodiment:

Referring to figs. 1 through Fig. 3, the present embodiment provides the sensor probe of a kind of fiber laser arrays fluid flow, including Piston cylinder 1 and be arranged at the detection case 2 of piston cylinder 1 side, the two ends of piston cylinder 1 are closed by end cap 3 respectively, Slide in piston cylinder 1 and be provided with piston 4, between the inwall of piston 4 and piston cylinder 1, be provided with piston packing 41, it is respectively provided with spring 5 between the end cap 3 at piston 4 and two ends, one end of spring 5 is fixed on piston 4, The other end is fixed on end cap 3, and the two ends of piston 4 are also respectively provided with reflecting piece 6, on the end cap 3 at two ends All offer detection through hole 7, in detection through hole 7, be provided with the fiber laser arrays end 9 pointing to reflecting piece 6, light The fibre bundle of fine test side 9 is gathered armouring by incident optical 91 and outgoing optical fiber 92 and is formed, incident optical 91 The other end docks with light source, and in order to couple incident illumination, the exit end of outgoing optical fiber 92 is connected with light-sensitive element, Output light intensity signal, i.e. can determine whether reflecting piece 6 and optical fiber by the power of outgoing optical fiber 92 received signal Distance between test side 9, thus calculate the sliding distance of piston 4, entrance piston can be extrapolated further The pressure reduction of the fluid of 4 both sides；

There is fluid intake 21 and fluid issuing 22 to enable flow across the inside of detection case 2 on detection case 2, Detection case 2 is connected by a fluid passage 10 respectively with the chamber of piston 4 both sides in piston cylinder 1, stream Being provided with filter screen 12 on body path 10, the centre of two fluid passages 10 is pointed in the supply direction of source of the gas 11 Position, and fluid passage 10 is respectively arranged at relative at detection case 2 internal flow path of fluid with source of the gas 11 Both sides, the blowing direction of source of the gas 11 is perpendicular with fluid circulating direction in detection case 2, is arranged such, works as inspection When fluid in measuring tank 2 does not circulates, the fluid pressure flowing into 4 liang of side cavity of piston should be identical, then piston 4 Equilbrium position can be in and keep constant, and after fluid flows, the fluid pressure flowing into 4 liang of side cavity of piston is Different, then piston 4 can slide, and the change of this pressure will be reflected in the optical signal of fibre-optical probe detection In change, i.e. detect the information such as fluid flow by this sensor.

The spring 5 of piston 4 both sides is symmetrical arranged, and the structure of the spring 5 of piston 4 both sides and specification the most complete Identical, when piston 4 is positioned at the centre position of two ends end cap 3, the spring 5 of piston 4 both sides is in nature State, i.e. spring tensionless winkler foundation and compressive deformation, two detection through holes 7 are all opened in the center of place end cap 3 Position, two detection through holes 7 and piston 4 be all coaxially disposed, reflecting piece 6 is vertically arranged with fiber laser arrays end 9, For slipper seal formula structure between the inwall of piston 4 and piston cylinder 1, in detection through hole 7, it is positioned at fiber laser arrays end The inner side of 9 is additionally provided with sealed light-transmitting sheet 8.

There are in piston cylinder 1 two fluid detection separated by the piston 4 being slideably positioned in piston cylinder 1 Chamber, if flowing without detected fluid in detection case 2, then the pressure of two fluid detection intracavity is identical, optical fiber Differential pressure pickup probe detects that two chamber pressure reduction are zero；If having detected fluid to flow in detection case 2, start gas Blow and form air-flow in source 11, then detected fluid interacts in detection case 2 with air-flow so that tested The initial momentum of fluid and air-flow changes, and fluid-mixing offsets in detection case 2, lives so that entering The fluid-mixing of plug cylinder 1 forms pressure difference in the both sides of piston 4, and piston 4 is at two fluid detection chamber pressure reduction Under effect, to low pressure side sliding, and by Optical Fibre Differential-Pressure Seasor probe detection pressure reduction, set up momentum pressure reduction Mathematical model, calculates and draws fluid momentum.

Claims

1. the sensor probe of a fiber laser arrays fluid flow, it is characterised in that: include piston cylinder (1) and Being arranged at the detection case (2) of piston cylinder (1) side, the two ends of piston cylinder (1) are sealed by end cap (3) respectively Closing, sliding in piston cylinder (1) is provided with piston (4), between the end cap (3) at piston (4) and two ends all Arranging spring (5), one end of spring (5) is fixed on piston (4), and the other end is fixed on end cap (3) On, the two ends of piston (4) are also respectively provided with reflecting piece (6), and the end cap (3) at two ends all offers Detection through hole (7), is provided with the fiber laser arrays end (9) pointing to reflecting piece (6) in detection through hole (7), The fibre bundle of fiber laser arrays end (9) is gathered armouring by incident optical (91) and outgoing optical fiber (92) and is formed；

There is fluid intake (21) and fluid issuing (22) to enable flow across detection case on detection case (2) (2) inside, detection case (2) and the chamber of piston (4) both sides in piston cylinder (1) are respectively by one Fluid passage (10) is connected, and also includes source of the gas (11), and two streams are pointed in the supply direction of source of the gas (11) The centre position of body path (10), and fluid passage (10) and source of the gas (11) be respectively arranged at fluid inspection The opposite sides of measuring tank (2) internal flow path.

A kind of sensor probe of fiber laser arrays fluid flow, it is characterised in that: The spring (5) of piston (4) both sides is symmetrical arranged, and the structure of the spring (5) of piston (4) both sides and rule Lattice are the most identical, when piston (4) is positioned at the centre position of two ends end cap (3), and piston (4) both sides Spring (5) be in naturalness.

A kind of sensor probe of fiber laser arrays fluid flow, it is characterised in that: Two detections through hole (7) are all opened in the center position of place end cap (3), two detections through hole (7) All being coaxially disposed with piston (4), reflecting piece (6) is vertically arranged with fiber laser arrays end (9), piston (4) And for slipper seal formula structure between the inwall of piston cylinder (1), in detection through hole (7), it is positioned at fiber laser arrays end (9) inner side is additionally provided with sealed light-transmitting sheet (8).

A kind of sensor probe of fiber laser arrays fluid flow, it is characterised in that: One end of described fiber laser arrays end (9) is tightened in detection through hole (7) by screw thread.

A kind of sensor probe of fiber laser arrays fluid flow, it is characterised in that: Piston packing (41) it is provided with between the inwall of piston (4) and piston cylinder (1).

A kind of sensor probe of fiber laser arrays fluid flow, it is characterised in that: Filter screen (12) it is provided with on described fluid passage (10).

A kind of sensor probe of fiber laser arrays fluid flow, it is characterised in that: The blowing direction of source of the gas (11) is perpendicular with detection case (2) interior fluid circulating direction.