CN205785649U - Blade damp type optical fiber differential pressure pickup is popped one's head in - Google Patents

Abstract

This utility model provides a kind of blade damp type optical fiber differential pressure pickup probe, rotation section it is provided with in housing, the opposite sides of rotation section is provided with dividing plate, the inner chamber of housing is divided into two test chamber by rotation section and dividing plate, two test chamber are all correspondingly arranged on detection fluid intake, the side of one dividing plate is provided with damping spring, one end of damping spring is fixed, the other end is fixed on this dividing plate, center of rotation along rotation section offers through hole, brake sack it is fixedly installed in through hole, the side of brake sack is provided with incident optical, opposite side is provided with reception optical fiber, and the reception end face receiving optical fiber is divided into optical fiber acceptance division and non-optical fiber acceptance division.To solve that existing differential pressure pick-up practicality is strong, limitation is relatively big or still in the concept phase, use cannot be promoted, and relatively conventional resistance-type, capacitance differential pressure transducer there is also the shortcoming of self, in a lot of occasions inapplicable, it is impossible to the problem meeting actual pressure differential measurement requirement.This utility model belongs to pressure differential detection field.

Description

Blade damp type optical fiber differential pressure pickup is popped one's head in

Technical field

This utility model relates to a kind of sensor probe, 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.Based on this, this reality A kind of novel fibre bundle differential pressure pick-up probe is proposed with novel.

Summary of the invention

The purpose of this utility model is: provide a kind of blade damp type optical fiber differential pressure pickup probe, to solve Existing 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 discomfort With, it is impossible to the problem meeting actual pressure differential measurement requirement.

Scheme of the present utility model is as follows: a kind of blade damp type optical fiber differential pressure pickup probe, including housing, Being provided with rotation section in housing, the rotating shaft of rotation section is paralleled with the centrage of housing, and the two is non-coaxial structure, I.e. relative eccentric, the opposite sides of rotation section is provided with dividing plate, and dividing plate can with rotation section in housing relatively Rotating, the inner chamber of housing is divided into two test chamber by rotation section and dividing plate, and two test chamber are all correspondingly arranged on Detection fluid intake, the side of a dividing plate is provided with damping spring, and one end of damping spring is fixed, and the other end is solid On this dividing plate, the center of rotation along rotation section offers through hole, is fixedly installed brake sack in through hole, hides The side of mating plate is provided with incident optical, and opposite side is provided with reception optical fiber, and the reception end face receiving optical fiber divides For optical fiber acceptance division and non-optical fiber acceptance division；

The reception end face receiving optical fiber can carry out partial occlusion to form non-optical fiber acceptance division by blocking parts, The part not being blocked is optical fiber acceptance division, or the reception end face receiving optical fiber only has part and there is optical fiber, then The part that there is optical fiber is optical fiber acceptance division, does not has the part of optical fiber to be non-optical fiber acceptance division；

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 the inwall to housing Place, and slipper seal between the inwall of dividing plate and housing；

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 Answering dividing plate perpendicular, be provided with salient point at the inwall of housing, one end of described damping spring is fixed on this salient point；

Described through hole, incident optical and reception fiber-coaxial are arranged；

Filter screen also it is correspondingly arranged at detection fluid intake；

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；

Housing has cylindrical cavity, under original state, and the rotary centerline of rotation section and the center of housing cavity Line is all in same plane with dividing plate；

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

The method utilizing above-mentioned fibre bundle differential pressure pick-up detection fluid pressure difference

Including housing, the inner chamber of housing is divided by the dividing plate of the rotation section being arranged in housing and rotation section opposite sides Being divided into two test chamber, two test chamber are all correspondingly arranged on detection fluid intake, and the center of rotation of rotation section is opened If through hole, rotate in brake sack is fixed on through hole and with rotation section；

Fluid is flowed into two test chamber by detection fluid intake respectively, if there is pressure between two detection cavity fluid The poorest, then the dividing plate of rotation section and rotation section opposite sides relatively rotates the center of rotation in portion and rotates, and The effect of the damping spring being arranged at a dividing plate side is issued to balance, and during rotation, brake sack also occurs to turn Dynamic, and make the optical fiber reception amount receiving optical fiber in incident optical that brake sack both sides are correspondingly arranged and outgoing optical fiber send out Changing, thus calculate the rotational angle drawing brake sack, the i.e. rotational angle of rotation section, thus can calculate Go out the damping spring force situation to dividing plate, and then extrapolate the pressure reduction of two detection cavity fluid.

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 has less structure, higher degree of accuracy and reliability, well adapting to property With the advantage such as interchangeability, practicality is extremely strong, and output valve will after opto-electronic conversion and signal processing calculate for output signal Changing at double, thus improve detection sensitivity, this sensor can be suitably used for numerous pressure differential detection occasion.

Meanwhile, this differential pressure pick-up employing rotational structure is as pressure detection device, when running into fluid pressure, Rotation section and diaphragm excursion motion, it is only necessary to pressure differential can be calculated, for light according to the deviation angle of rotation section The requirement of fine sensing is lower, calculates and measure the simplest, and detection is susceptible to external interference, is hardly damaged, Service life is the most permanent so that the reliability of sensor, adaptability and interchangeability have had relatively much progress, suitable Preferably it is used as the measurement of fluid differential pressure；The intensity compensation principle of sensor is the simplest, and practicality is higher.

Accompanying drawing explanation

Fig. 1 is the profile of this sensor probe；

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 blade damp type optical fiber differential pressure pickup probe, including Housing 1, housing 1 uses flat tubular construction, and housing 1 has cylindrical cavity, under original state, The rotary centerline of rotation section 2 and the centrage of housing 1 inner chamber are all in same plane with dividing plate 3, housing Being provided with rotation section 2 in 1, the rotating shaft of rotation section 2 is paralleled with the centrage of housing 1, and the two is non-coaxial Structure (relative eccentric), the opposite sides of rotation section 2 is provided with dividing plate 3, and dividing plate 3 can be with rotation section 2 relatively rotate in housing 1, particularly as follows: the position of the corresponding dividing plate 3 in rotation section 2 is provided with chute 21, every One end of plate 3 is all slideably positioned in corresponding chute 21 (slipper seal between dividing plate 3 and chute 21), Between the bottom of dividing plate 3 and its place chute 21, pressure is provided with spring 9, and the other end of dividing plate 3 holds out against to housing 1 Inwall at, and slipper seal between the inwall of dividing plate 3 and housing 1, the inner chamber of housing 1 by rotation section 2 and every Plate 3 is divided into two test chamber, and two test chamber are all correspondingly arranged on detection fluid intake 4, and detection fluid enters Filter screen 41 also it is correspondingly arranged at mouth 4；

The side of one of them dividing plate 3 is provided with damping spring 5, is provided with salient point 11 at the inwall of housing 1, One end of damping spring 5 is fixed on this salient point 11, and the other end is fixed on dividing plate 3, and damping spring 5 is The damping spring that rigidity is stronger, under free state, does not has fluid to flow into or in two test chamber in i.e. two test chamber When fluid pressure is identical, the shape vanishing of damping spring 5, and damping spring 5 is perpendicular with corresponding dividing plate 3；

Center of rotation along rotation section 2 offers through hole 22, is fixedly installed brake sack 6 in through hole 22, hides The side of mating plate 6 is provided with incident optical 7, and opposite side is provided with reception optical fiber 8, and receives connecing of optical fiber 8 Receiving end face is divided into optical fiber acceptance division 81 and non-optical fiber acceptance division 82, through hole 22, incident optical 7 and reception optical fiber 8 are coaxially disposed, receive optical fiber 8 cross-sectional outer diameter identical with the internal diameter of through hole 22, described brake sack 6 with connect The end face receiving optical fiber 8 is parallel, and brake sack 6 be semicircular structure, and the diameter of brake sack 6 and through hole 22 Internal diameter identical, optical fiber acceptance division 81 and non-optical fiber acceptance division 82 are semicircular structure, and the two axial symmetry Arranging, the reception end face half i.e. receiving optical fiber 8 is able to receive that fiber-optic signal, and second half cannot receive optical fiber letter Number, under original state, do not have in i.e. two test chamber fluid flow into or two test chamber in fluid pressure identical time, The shield portions of brake sack 6 coincides with non-optical fiber acceptance division 82 just；

The reception end face receiving optical fiber 8 can carry out partial occlusion to form the reception of non-optical fiber by blocking parts Portion 82, the part not being blocked is optical fiber acceptance division 81, or the reception end face receiving optical fiber 8 only has part There is optical fiber, then the part that there is optical fiber is optical fiber acceptance division 81, does not has the part of optical fiber to be non-optical fiber Acceptance division 82, during detection fluid pressure difference, fluid is flowed into two test chamber by detection fluid intake 4 respectively, if Pressure difference is there is, then dividing plate 3 phase of rotation section 2 and rotation section 2 opposite sides between two detection cavity fluid The center of rotation of rotation section 2 is rotated, and in the effect of the damping spring 5 being arranged at dividing plate 3 side Being issued to balance, during rotation, brake sack 6 also rotates, and makes brake sack 6 both sides be correspondingly arranged The optical fiber reception amount receiving optical fiber 8 in incident optical 7 and outgoing optical fiber 8 changes, thus calculates and draw screening The rotational angle of mating plate 6, the i.e. rotational angle of rotation section 2, thus damping spring 5 can be extrapolated to dividing plate The force situation of 3, and then extrapolate the pressure reduction of two detection cavity fluid.

The calculating of this sensor probe mathematical model

During calculating, we set out the height value of housing 1 inner chamber is 50mm, and radius is R, 3 liang of dividing plate Side cavity has a pressure differential, and after again reaching equilbrium position, receives the change of the fiber strength that optical fiber 8 receives Change amount is Δ P, and the dividing plate 3 eccentric throw apart from the center of housing 1 is e, and damping spring stiffness factor is k, resistance Buddhist nun's spring is d with the distance in axle center, rotation section 2, the blade lateralarea (end of side, rotation section 2 dividing plate 3 Face area) it is S₁, lower blade lateralarea (face area of rotation section 2 opposite side dividing plate 3) is S₂On, Length of blade (length of one of them dividing plate 3 shown in Fig. 1) is L₁, lower blade length (shown in Fig. 1 another The length of individual dividing plate 3) it is L₂, blade deflection angle (deflection angle of dividing plate 3) θ, steamboat radius (rotates The radius in portion 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 (7)

1. null1. a blade damp type optical fiber differential pressure pickup probe，It is characterised by: include housing (1)，Rotation section (2) it is provided with in housing (1)，The rotating shaft of rotation section (2) is paralleled with the centrage of housing (1)，The opposite sides of rotation section (2) is provided with dividing plate (3)，And dividing plate (3) can relatively rotate in housing (1) with rotation section (2)，The inner chamber of housing (1) is divided into two test chamber by rotation section (2) and dividing plate (3)，Two test chamber are all correspondingly arranged on detection fluid intake (4)，The side of one dividing plate (3) is provided with damping spring (5)，One end of damping spring 5 is fixed，The other end is fixed on this dividing plate (3)，Center of rotation along rotation section (2) offers through hole (22)，Brake sack (6) it is fixedly installed in through hole (22)，The side of brake sack (6) is provided with incident optical (7)，Opposite side is provided with reception optical fiber (8)，And the reception end face receiving optical fiber (8) is divided into optical fiber acceptance division (81) and non-optical fiber acceptance division (82).
2. A kind of blade damp type optical fiber differential pressure pickup probe, it is characterized in that: the position of rotation section (2) corresponding dividing plate (3) is provided with chute (21), one end of dividing plate (3) is all slideably positioned in corresponding chute (21), between the bottom of dividing plate (3) and its place chute (21), pressure is provided with spring (4), the other end of dividing plate (3) holds out against to the inwall of housing (1), and slipper seal between the inwall of dividing plate (3) and housing (1).
3. A kind of blade damp type optical fiber differential pressure pickup probe, it is characterized 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, the shape vanishing of damping spring (5), and damping spring (5) is perpendicular with corresponding dividing plate (3), being provided with salient point (11) at the inwall of housing (1), one end of described damping spring (5) is fixed on this salient point (11).
4. A kind of blade damp type optical fiber differential pressure pickup probe, it is characterised in that: described through hole (22), incident optical (7) and reception optical fiber (8) are coaxially disposed.
5. A kind of blade damp type optical fiber differential pressure pickup probe, it is characterized in that: the cross-sectional outer diameter of described reception optical fiber (8) is identical with the internal diameter of through hole (22), described brake sack (6) is paralleled with the end face receiving optical fiber (8), brake sack (6) is semicircular structure, and the diameter of brake sack (6) is identical with the internal diameter of through hole (22), optical fiber acceptance division (81) and non-optical fiber acceptance division (82) are semicircular structure, and the two axial symmetry is arranged, under original state, do not have in i.e. two test chamber fluid flow into or two test chamber in fluid pressure identical time, the shield portions of brake sack (6) coincides with non-optical fiber acceptance division (82) just.
6. A kind of blade damp type optical fiber differential pressure pickup probe, it is characterized in that: housing (1) has cylindrical cavity, under original state, the rotary centerline of rotation section (2) and the centrage of housing (1) inner chamber are all in same plane with dividing plate (3).
7. A kind of blade damp type optical fiber differential pressure pickup probe, it is characterised in that: housing (1) uses flat tubular construction.