CN205655955U - Optic fibre differential pressure sensor shell structure that pops one's head in - Google Patents

Abstract

The utility model provides an optic fibre differential pressure sensor shell structure that pops one's head in, the shell structure of probe body for having the cylinder inner chamber, the inner chamber of probe body be two measuring chambeies in probe this internal rotation portion with setting up to separate in the baffle of the relative both sides of rotation portion by setting up, two are detected all corresponding detection fluid entrys that is provided with of chamber, detect the still corresponding filter screen that is provided with of fluid entrance, the inner wall department of probe body is provided with the bump, the one end of damping spring is fixed in on this bump, the other end is fixed in on this baffle, follow the center of rotation of rotation portion and seted up the through -hole, the through -hole internal fixation is provided with the anti -dazzling screen. Present differential pressure sensor practicality is strong, the limitation is great or still be in the notion phase in order to solve, can't be used widely, and also there is the shortcoming of self in comparatively common resistance -type, capacitanc differential pressure sensor, are not suitable for in a lot of occasions, can't satisfy actual differential pressure and measure the problem that requires. The utility model belongs to pressure differential detection area.

Description

A kind of optical fiber differential pressure pickup probing shell structure

Technical field

This utility model relates to a kind of sensor probe shell structure, belongs to technical field of optical fiber sensing.

Background technology

Differential pressure pick-up is widely used in industry, is mainly used in device measuring, parts or fluid at diverse location Pressure differential, it is widely used in the detection neck such as tail gas pressure reduction, gas flow, height of liquid level, clean room monitoring Territory.Now, occurred use different principle differential pressure pick-up, such as resistance-type, condenser type, inductance type, Reducer formula, magnetic liquid formula, MEMS formula etc., wherein resistance-type, condenser type are relatively conventional, remaining class Type is owing to practicality is not strong, limitation is relatively big or still in the concept phase, is not promoted, but resistance-type, electricity Appearance formula differential pressure pick-up there is also the shortcoming of self, can not well be competent in a lot of occasions.

Summary of the invention

The purpose of this utility model is: provide a kind of optical fiber differential pressure pickup probing shell structure, existing to solve Have that differential pressure pick-up practicality is strong, limitation is relatively big or still in the concept phase, it is impossible to be promoted use, and Relatively conventional resistance-type, capacitance differential pressure transducer there is also the shortcoming of self, in a lot of occasions inapplicable, The problem that cannot meet actual pressure differential measurement requirement.

Scheme of the present utility model is as follows: a kind of optical fiber differential pressure pickup probing shell structure, including probe body, Probe body is the shell structure with cylindrical cavity, and the inner chamber of probe body is by being arranged in probe body Rotation section and the dividing plate being arranged at rotation section opposite sides are divided into two test chamber, and dividing plate can visited with rotation section This internal rotation of head, two test chamber are all correspondingly arranged on detection fluid intake, the most corresponding at detection fluid intake Being provided with filter screen, the side of one of them dividing plate is provided with damping spring, is provided with convex at the inwall of probe body Point, one end of described damping spring is fixed on this salient point, and the other end is fixed on this dividing plate, along rotation section Center of rotation offers through hole, is fixedly installed brake sack in through hole.

During use, only need to arrange incident optical in the side of brake sack, opposite side arranges reception optical fiber, through hole, Incident optical and reception fiber-coaxial are arranged, and incident optical and reception optical fiber do not move with the rotation of rotation section, The reception end face receiving optical fiber is divided into optical fiber acceptance division and non-optical fiber acceptance division, and the reception end face receiving optical fiber is permissible Carrying out partial occlusion to form non-optical fiber acceptance division by blocking parts, the part not being blocked is optical fiber and receives , then there is the part of optical fiber and be optical fiber and receive in portion, or the reception end face receiving optical fiber only has part and there is optical fiber Portion, does not has the part of optical fiber to be non-optical fiber acceptance division；

The cross-sectional outer diameter of described reception optical fiber is identical with the internal diameter of through hole, described brake sack and the end face receiving optical fiber Parallel, brake sack is semicircular structure, and the diameter of brake sack is identical with the internal diameter of through hole, optical fiber acceptance division It is semicircular structure with non-optical fiber acceptance division, and the two axial symmetry is arranged, and i.e. receives the reception end face one of optical fiber Partly being able to receive that fiber-optic signal, second half cannot receive fiber-optic signal, under original state, in i.e. two test chamber Do not have fluid flow into or two test chamber in fluid pressure identical time, the shield portions of brake sack connects with non-optical fiber just Receipts portion coincides；

During detection fluid pressure difference, after fluid flows into two test chamber, rotation section rotates and drives brake sack to rotate, Thus brake sack blocks position changes, receive the change of signal i.e. by receiving optical fiber acceptance division in optical fiber The rotational angle of rotation section can be extrapolated, thus the damping spring force size to dividing plate can be extrapolated, and then Extrapolate the pressure difference of two detection cavity fluid；

The position of rotation section correspondence dividing plate is provided with chute, and one end of dividing plate is all slideably positioned in corresponding chute In, between the bottom of dividing plate and its place chute, pressure is provided with spring, and the other end of dividing plate holds out against to probe body At inwall, and slipper seal between the inwall of dividing plate and probe body；

Described damping spring is the damping spring that rigidity is stronger, under free state, does not flow in i.e. two test chamber When body flows into or in two test chamber, fluid pressure is identical, the shape vanishing of damping spring, and damping spring is right with institute Answer dividing plate perpendicular；

Under original state, the rotary centerline of rotation section and the centrage of probe body inner chamber are all in same with dividing plate One plane；

For ensureing that structure is the compactest, space availability ratio is higher, and probe body uses flat tubular construction；

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 housing has less structure, higher degree of accuracy and reliability, preferably The advantage such as adaptability and interchangeability, practicality is extremely strong, and output signal is after opto-electronic conversion and signal processing calculate Output valve will change at double, thus improve detection sensitivity, make sensor can be suitably used for numerous pressure differential detection field Close.

Meanwhile, this differential pressure pick-up probing shell uses rotational structure as pressure detection device, is running into stream During body pressure, rotation section and diaphragm excursion motion, it is only necessary to pressure can be calculated according to the deviation angle of rotation section Difference, the requirement for Fibre Optical Sensor is lower, calculates and measure the simplest, and detection is susceptible to external interference, Being hardly damaged, service life is the most permanent so that the reliability of sensor, adaptability and interchangeability have had relatively Much progress, is suitable for use as the measurement of fluid differential pressure；And the intensity compensation principle of sensor is the simplest, practicality Higher.

Accompanying drawing explanation

Fig. 1 is the profile of this sensor probe housing；

Fig. 2 be in this Fig. 1 A-A to sectional view；

Fig. 3 is optical fiber designs figure, and wherein, a is the structural representation of incident optical incident end face, and b is for hiding The structural representation of tabula rasa, c is to receive optical fiber to receive the structural representation of end face；

Fig. 4 pressure difference and the functional image of luminous flux.

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 a kind of optical fiber differential pressure pickup probing shell structure, including visiting Head body 1, probe body 1 uses flat tubular construction, and probe body 1 has cylindrical cavity, visits The inner chamber of head body 1 is by the rotation section 2 being arranged in probe body 1 and is arranged at rotation section 2 opposite sides Dividing plate 3 is divided into two test chamber, and dividing plate 3 can rotate in probe body 1 with rotation section 2, original state Under, the rotary centerline of rotation section 2 and the centrage of probe body 1 inner chamber are all in same plane with dividing plate 3,

Two test chamber are all correspondingly arranged on detection fluid intake 4, are also correspondingly arranged at detection fluid intake 4 Filter screen 41, the side of one of them dividing plate 3 is provided with damping spring 5, and described damping spring 5 is that rigidity is stronger Damping spring, under free state, do not have in i.e. two test chamber fluid flow into or two test chamber in fluid pressure Time identical, the shape vanishing of damping spring 5, and damping spring 5 is perpendicular with corresponding dividing plate 3, probe is originally Being provided with salient point 11 at the inwall of body 1, one end of described damping spring 5 is fixed on this salient point 11, another End is fixed on this dividing plate 3, and the center of rotation along rotation section 2 offers through hole 22, fixes setting in through hole 22 It is equipped with brake sack 6.

The position of the corresponding dividing plate 3 in rotation section 2 is provided with chute 21, and one end of dividing plate 3 is all slideably positioned in institute In corresponding chute 21, between the bottom of dividing plate 3 and its place chute 21, pressure is provided with spring 9, dividing plate 3 The other end holds out against to the inwall of probe body 1, and slipper seal between the inwall of dividing plate 3 and probe body 1；

During use, only need to arrange incident optical 7 in the side of brake sack 6, opposite side arranges reception optical fiber 8, Through hole 22, incident optical 7 and receive optical fiber 8 and be coaxially disposed, and incident optical 7 and receive optical fiber 8 not with The rotation of rotation section 2 and move, the reception end face receiving optical fiber 8 is divided into optical fiber acceptance division 81 and non-optical fiber to connect Receipts portion 82, the reception end face receiving optical fiber 8 can carry out partial occlusion to form non-optical fiber by blocking parts Acceptance division 82, the part not being blocked is optical fiber acceptance division 81, and during detection fluid pressure difference, fluid flows into two After test chamber, the rotation section 2 drive brake sack 6 that rotates rotates, thus brake sack 6 blocks position becomes Changing, the change receiving signal by receiving optical fiber acceptance division 81 in optical fiber 8 can extrapolate rotation section 2 Rotational angle, thus the damping spring force size to dividing plate 3 can be extrapolated, and then extrapolate two detections The pressure difference of cavity fluid.

The calculating of this sensor probe mathematical model

During calculating, we set out the height value of probe body 1 inner chamber is 50mm, and radius is R, dividing plate 3 liang of side cavity have a pressure differential, and after again reaching equilbrium position, receive the fiber strength that optical fiber 8 receives Variable quantity be Δ P, the dividing plate 3 eccentric throw apart from the center of probe body 1 is e, damping spring stiffness system Number is k, and damping spring is d with the distance in axle center, rotation section 2, blade lateralarea (side, rotation section 2 The face area of dividing plate 3) it is S₁, lower blade lateralarea (face area of rotation section 2 opposite side dividing plate 3) For S₂, blade length (length of one of them dividing plate 3 shown in Fig. 1) is L₁, lower blade length (Fig. 1 The length of another dividing plate 3 shown) it is L₂, blade deflection angle (deflection angle of dividing plate 3) θ, steamboat half Footpath (radius of rotation section 2) r₂, steamboat pore radius (radius of through hole 22) r₁。

When fluid enters, due to pressure differential, dividing plate produces different moments of torsion, wherein T₁The moment of torsion produced for fluid, T₂For hindering moment of torsion to obtain formula (1)

T₁-T₂=d F_Bullet=kdx (1)

Can obtain X, again because T=Δ P*T*L, conversion draws (2)

$X=\frac{T_1-T_2}{kd}=\frac{\mathrm{\Δ}p(T_1{L}_1-T_2{L}_2)}{kd}---\left(2\right)$

Such that it is able to obtain variable quantity

$\⇒\mathrm{\Δ}P=\frac{kxd}{S_1{L}_1-S_2{L}_2}---\left(3\right)$

Known

Then

So the expression formula that can calculate logical light quantity is:

Again

S₁=50 (L₁-R₂) S₂=50 (L₂-R₂) (8)

The expression formula that then can obtain variation of light intensity is:

For ease of calculating, we take wherein R=50mm, ε=1, e=10mm, k=100d=40mm, θ value It is 0～1 degree, θ=(0:0.1:1), owing to θ angle is the least, L₁、L₂、S₁、S₂Can be approximately considered constant, Then make S₁=2000mm, S₂=1000mm, L₁=60mm, L₂=40mm, and drawCurve such as Fig. 4.When When both sides pressure difference is 0, the luminous flux of reception is 0, and now blade (dividing plate 3) is in original position.And During along with the increase of both sides pressure difference, blade balance is broken realization deflection, and luminous flux changes therewith, and has Good linear relationship.

Claims (5)

1. an optical fiber differential pressure pickup probing shell structure, including probe body (1), it is characterised in that: visit Head body (1) is the shell structure with cylindrical cavity, and the inner chamber of probe body (1) is by being arranged at probe body (1) rotation section (2) in and be arranged at the dividing plate (3) of rotation section (2) opposite sides and be divided into two test chamber, dividing plate (3) can rotate in probe body (1) with rotation section (2), two test chamber are all correspondingly arranged on detection Fluid intake (4), detection fluid intake (4) place is also correspondingly arranged on filter screen (41), one of them dividing plate (3) side is provided with damping spring (5), is provided with salient point (11) at the inwall of probe body (1), One end of described damping spring (5) is fixed on this salient point (11), and the other end is fixed on this dividing plate (3), Center of rotation along rotation section (2) offers through hole (22), and through hole is fixedly installed brake sack in (22) (6)。

A kind of optical fiber differential pressure pickup probing shell structure, it is characterised in that: The position of the corresponding dividing plate (3) in rotation section (2) is provided with chute (21), all slides in one end of dividing plate (3) It is arranged in corresponding chute (21), presses between the bottom of dividing plate (3) and its place chute (21) and set Spring (9), the other end of dividing plate (3) is had to hold out against to the inwall of probe body (1), and dividing plate (3) And slipper seal between the inwall of probe body (1).

A kind of optical fiber differential pressure pickup probing shell structure, it is characterised in that: Under free state, do not have in i.e. two test chamber fluid flow into or two test chamber in fluid pressure identical time, damping The shape vanishing of spring (5), and damping spring (5) is perpendicular with corresponding dividing plate (3).

A kind of optical fiber differential pressure pickup probing shell structure, it is characterised in that: Under original state, the rotary centerline of rotation section (2) and the centrage of probe body (1) inner chamber are all and dividing plate (3) it is in same plane.

A kind of optical fiber differential pressure pickup probing shell structure, it is characterised in that: Probe body (1) uses flat tubular construction.