CN206330646U - A kind of liquid level sensor - Google Patents
A kind of liquid level sensor Download PDFInfo
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- CN206330646U CN206330646U CN201621451882.4U CN201621451882U CN206330646U CN 206330646 U CN206330646 U CN 206330646U CN 201621451882 U CN201621451882 U CN 201621451882U CN 206330646 U CN206330646 U CN 206330646U
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Abstract
The utility model discloses a kind of liquid level sensor, in the sensor, the structure of first seal and second seal, and the mode being connected through a screw thread with reference to fastener is respectively adopted using diaphragm both sides in cavity, is totally disconnected two spaces by cavity isolation.When diaphragm is located at liquid side by fluid pressure, liquid does not penetrate into the opposite side of diaphragm and pollutes the component of fiber grating therein.In addition, utilize projection component, so that the opposite side of diaphragm is fixed at fiber grating two ends by projection component, and fiber grating center section is hanging, and then the axially loaded of whole fiber grating is uniform, it is to avoid fiber grating is directly bonded in the problem of stress distribution brought on diaphragm is uneven.Meanwhile, diaphragm employs TC4 titanium alloy materials, drastically increases the measurement accuracy of liquid level sensor.
Description
Technical field
The utility model is related to sensor field, more particularly to a kind of liquid level sensor based on fiber grating.
Background technology
Fiber grating is as with the fastest developing speed in recent years, using one of extremely wide fiber optic passive device, with tradition
Electric signal class sensor is compared, and with simple in construction, good reliability, corrosion-resistant, anti-electromagnetic interference capability is strong and multiplexing capacity is strong
The advantages of, the sensing network of a variety of connected modes can be formed, large area, multimetering etc. is realized.Due to optical fiber grating sensing
Device itself possesses many irreplaceable superiority, therefore by more and more researchers and the green grass or young crops of engineers and technicians
Look at.
Liquid level sensor is fiber grating in an important application direction of sensor field.According to different packaged types
And encapsulating structure, Fiber Grating Liquid Depth Sensor can be divided into polymer encapsulated class formula Fiber Grating Liquid Depth Sensor, based on flat
Facial mask chip Fiber Grating Liquid Depth Sensor and other types of fiber-optic grating sensor.
Because the limitation of use environment, to being carried in terms of the sealing property of liquid level sensor, resistance to corrosion, measurement accuracy
Higher and higher requirement is gone out.Therefore, still there is very high room for promotion for the liquid level sensor of fiber grating class.
Utility model content
In view of this, the utility model provides a kind of liquid level sensor, to improve its measurement accuracy and corrosion resistance,
And extend working life.
What the technical solution of the utility model was realized in：
A kind of liquid level sensor, including：
Cavity；
Cavity lid, the cavity lid is covered on the cavity, forms cavity space；
Diaphragm, the diaphragm is located in the cavity, by the cavity space be divided into mutual disconnected first space and
Second space, also, the diaphragm produces deformation with the pressure change in the first space；
Projection component, the projection component is fixed on the diaphragm towards the side of the second space；
Fiber grating, the fiber grating is installed on the projection component, when the diaphragm produces deformation, the projection
Component exerts a force to the fiber grating so that the fiber grating produces flexible；
Optical fiber, the optical fiber is connected to the fiber grating；Wherein,
The side wall that the cavity is located at the first space side offers pod apertures so that the containment portion liquid enters institute
State the first space；
The side wall that the cavity is located at second space side offers light path connecting hole, the optical fiber by with the light path
The connection terminal that connecting hole matches is drawn out of described cavity and is connected to the signal detection apparatus of outside, wherein, the light
Road connecting hole and the connection terminal are tightly connected.
Further, the madial wall of the cavity has boss；
The liquid level sensor also includes first seal, second seal and fastener, wherein：
The first seal, diaphragm and second seal are placed on the boss with stacking gradually；
The fastener is located at side of the second seal away from the diaphragm, also, the fastener will be described
Second seal, diaphragm, first seal press on the boss so that first space and second space are isolated.
Further, the cavity is the cylindrical shape that one end is closed；
The boss is the step that the cavity cylindrical inner the week side of boss extends to inside cavities；
The first seal and second seal are ring packing packing ring.
Further, the cavity inner wall has internal thread；
The fastener is annular shape, and the fastener has the outer spiral shell that the internal thread with the cavity inner wall matches
Line, the fastener coordinates the second seal, diaphragm, first seal pressing on the boss by screw thread.
Further, the openend that the cavity is located at cavity lid has external screw thread；
The cavity lid is cylindrical, and the cavity lid has what the external screw thread with the cavity hatch end matched
Internal thread, the cavity lid coordinates to be covered on the cavity by screw thread.
Further, the chamber outer wall the week side of boss has the sealed groove towards the cavity lid；
Sealing ring is set in the sealed groove；
When the cavity lid is covered on the cavity, the edge of the open side of the cavity lid is recessed into the sealing
Groove, and it is resisted against the sealing ring.
Further, the projection component includes the first projection and the second projection；Wherein,
There is first projection the first grating fixed part and the first grating to wear socket part；Wherein,
The first grating fixed part is fixed on the diaphragm, and the first grating fixed part is offered and the optical fiber
The first grating fixed groove that grating matches, with fiber grating described in holding；
First grating wears socket part and offers the first through hole matched with the fiber grating, with the fixed optical fiber
Grating；
There is second projection the second grating fixed part and the second grating to wear socket part；Wherein,
The second grating fixed part is fixed on the diaphragm, and the second grating fixed part is offered and the optical fiber
The second grating fixed groove that grating matches, with fiber grating described in holding；
Second grating wears socket part and offers the second through hole matched with the fiber grating, with the fixed optical fiber
Grating；
Wherein, the first through hole and second through hole are coaxially disposed, the first grating fixed part and the second grating
Fixed part is oppositely arranged；
The two ends of the fiber grating wear and are fixed on the first through hole and the second through hole respectively.
Further, the end of the fiber grating by the joint laser welding that metallizes in the first grating fixed groove
With the second grating fixed groove.
Further, the diaphragm is TC4 titanium alloy diaphragms.
From such scheme as can be seen that liquid level sensor of the present utility model, is respectively adopted first close using diaphragm both sides
The structure of sealing and second seal, and the mode being connected through a screw thread using fastener so that diaphragm both sides space completely every
Absolutely, when diaphragm is located at liquid side by fluid pressure, liquid does not penetrate into the opposite side of diaphragm and pollutes optical fiber therein
The component of grating.Utilize projection component so that projection component is fixed at fiber grating two ends, and fiber grating center section is outstanding
Sky, and then the uniform force of whole fiber grating, it is to avoid fiber grating is directly bonded in the stress distribution brought on diaphragm
Uneven the problem of.Also, the use of projection component has been also convenient for more easily carrying out prestretching when optical fiber is pasted
Stretch, and be easier to fix.Because diaphragm employs TC4 titanium alloy materials, the measurement of liquid level sensor is also drastically increased
Precision, test result indicate that, liquid level sensor of the present utility model, when range is 10 meters, its full accuracy reaches
35.82nm/MPa (nanometer/MPa), the measurement of different depth and precision is can apply to according to range, its linearity has been arrived
Up to 0.99949.
Brief description of the drawings
Fig. 1 is the external structure schematic diagram of the liquid level sensor of the utility model embodiment；
Fig. 2 is the structure decomposition figure of the liquid level sensor of the utility model embodiment；
Fig. 3 is the cross-sectional view of the liquid level sensor of the utility model embodiment；
Fig. 4 be the utility model embodiment in cavity structural representation；
Fig. 5 be the utility model embodiment in fastener structure；
Fig. 6 is the diaphragm and the structural representation of projection component in the utility model embodiment；
Fig. 7 is the first projection and the structural representation of the second projection in the utility model embodiment；
Fig. 8 is the optical fiber grating structure schematic diagram in the utility model embodiment.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, develop simultaneously reality referring to the drawings
Example is applied, the utility model is described in further detail.
Fig. 1 shows the external structure of the liquid level sensor of the utility model embodiment, and Fig. 2 is the utility model embodiment
Liquid level sensor structure decomposition figure, Fig. 3 for the utility model embodiment liquid level sensor diagrammatic cross-section.Referring to figure
1st, shown in Fig. 2, Fig. 3, the liquid level sensor of the utility model embodiment include cavity 1, cavity lid 2, diaphragm 3, projection component 4,
Fiber grating (not shown), optical fiber (not shown).Wherein, the cavity lid 2 is covered on the cavity 1, forms chamber
Body space.The diaphragm 3 is located in the cavity 1, and the cavity space is divided into mutual disconnected first space 11 and the
Two spaces 12, also, the diaphragm 3 produces deformation with the pressure change in the first space 11.The projection component 4 is fixed on
The diaphragm 3 is towards the side of the second space 12.The fiber grating is installed on the projection component 4, when the diaphragm 3
When producing deformation, the projection component 4 exerts a force to the fiber grating so that the fiber grating produces flexible.The optical fiber
It is connected to the fiber grating.
Referring also to shown in Fig. 4, wherein, the side wall that the cavity 1 is located at the side of the first space 11 offers pod apertures 13,
So that the liquid outside the cavity 1 enters first space 11.The side wall that the cavity 1 is located at the side of second space 12 is opened
Provided with light path connecting hole 14, the optical fiber is by the connection terminal that matches with the light path connecting hole 14 out of described cavity 1
The signal detection apparatus of outside is drawn and is connected to, wherein, the light path connecting hole 14 and the connection terminal are tightly connected.
It is to be completely cut off the first space 11 and second space 12 using seal in the utility model embodiment.Specifically
Ground, as shown in Figure 2, Figure 3, Figure 4, the madial wall of the cavity 1 have boss 15, and the liquid level sensor also includes the first sealing
Part 5, second seal 6 and fastener 7.Wherein, the first seal 5, diaphragm 3 and second seal 6 are put with stacking gradually
In on the boss 15.The fastener 7 is located at side of the second seal 6 away from the diaphragm 3, also, described tight
The second seal 6, diaphragm 3, first seal 5 are stackably pressed on the boss 15 by firmware 7 so that described first is empty
Between 11 and second space 12 be isolated.
Further, the cavity 1 is the cylindrical shape that one end is closed, and the boss 15 is in the cylindrical shape of the cavity 1
Wall the week side of boss is to the step of the inner side of cavity 1 extension, and the first seal 5 and second seal 6 are ring packing packing ring.
Fig. 5 shows the structure of the fastener 7 in the utility model embodiment.Referring concurrently to Fig. 2, Fig. 3, Fig. 4 and Fig. 5 institute
Show, the inwall of the cavity 1 has an internal thread, the fastener 7 is annular shape, and the fastener 7 has and the chamber
The external screw thread that the internal thread of the inwall of body 1 matches, fastener 7 is coordinated by screw thread to screw in the cavity 1, will be described
Second seal 6, diaphragm 3, first seal 5 press on the boss.
Further, the fastener 7, which has, installs bayonet socket 71, and the installation bayonet socket 71 is fastened in using installation tool
In, fastener 7 is screwed in cavity 1.
The utility model embodiment, passes through fastener 7, second seal 6, diaphragm 3, first seal 5 and boss 15
Cooperation, realize the isolation of two spaces in liquid level sensor, and then, when liquid level sensor is placed in liquid, first is empty
Between liquid in 11 will not enter through second seal 6, diaphragm 3 and first seal 5 in second space 12, so as to protect
Fiber grating in second space 12.
With continued reference to shown in Fig. 2, Fig. 3 and Fig. 4, the openend that the cavity 1 is located at cavity lid 2 has external screw thread.Institute
State that cavity lid 2 is cylindrical, and the cavity lid 2 has the internal thread that the external screw thread with the openend of cavity 1 matches,
The cavity lid 2 coordinates to be covered on the cavity 1 by screw thread.
Wherein, the outer wall the week side of boss of the cavity 1 has the sealed groove 16 towards the cavity lid 2, the sealed groove
Sealing ring 8 is set in 16.When the cavity lid 2 is covered on the cavity 1, the edge of the open side of the cavity lid 2 enters institute
Sealed groove 16 is stated, and is resisted against the sealing ring 8.It is achieved thereby that second space 12 and extraneous isolation, when this practicality is new
When the liquid level sensor of type embodiment is placed in fluid to be measured, the edge of sealed groove 16, sealing ring 8 and cavity lid 2 is engaged
Structure can effectively prevent that fluid to be measured from entering in second space 12, and then protect the optical fiber light in second space 12
Grid.
Fig. 6 shows the structure of diaphragm 3 and the part of projection component 4.The projection component 4 includes the first projection 41 and second
Projection 42.First projection 41 is identical with the shapes and sizes of the second projection 42.Fig. 7 shows the structure of projection.Institute
Stating projection, there is grating fixed part 101 and grating to wear socket part 102.Wherein, the grating fixed part 101 is offered and the optical fiber
The grating fixed groove 103 that grating matches, to holding and the fixed fiber grating.The grating is worn socket part 102 and opened up
There is the through hole 104 matched with the fiber grating, the fiber grating is connect to wear, and aid in fixing the fiber grating
Position, prevents that fiber grating from departing from the grating fixed groove 103 when being welded in the grating fixed groove 103 and increasing and survey
Measure error.The grating fixed part 101 and grating are worn socket part 102 and are mutually perpendicular to.
, can be with reference to shown in Fig. 6 and Fig. 7 specific to the first projection 41 and the second projection 42.First projection 41 has the
One grating fixed part 411 and the first grating wear socket part 412.Wherein, the first grating fixed part 411 is fixed on the diaphragm 3,
And the first grating fixed part 411 offers the first grating fixed groove 413 matched with the fiber grating, to hold in the palm
Hold the fiber grating.First grating wears socket part 412 and offers the first through hole 414 matched with the fiber grating,
The fiber grating is connect to wear, and aids in fixing the position of the fiber grating, prevents that fiber grating is being welded in described first
Depart from the first grating fixed groove 413 during grating fixed groove 413 and increase measurement error.The first grating fixed part
411 and first grating wear socket part 412 and be mutually perpendicular to.Second projection 42 has the second grating fixed part 421 and the second grating
Wear socket part 422.Wherein, the second grating fixed part 421 is fixed on the diaphragm 3, and the second grating fixed part 421 is opened
Provided with the second grating fixed groove 423 matched with the fiber grating, with fiber grating described in holding.Second grating
Wear socket part 422 and offer the second through hole 424 matched with the fiber grating, with the position of the fixed fiber grating, prevent
Only fiber grating departs from the second grating fixed groove 423 when being welded in the second grating fixed groove 423 and increased
Measurement error.The second grating fixed part 421 and the second grating are worn socket part 422 and are mutually perpendicular to.Wherein, the first through hole
414 and second through hole 424 be coaxially disposed, the first grating fixed part 411 and the second grating fixed part 421 is relative sets
Put.The two ends of the fiber grating are arranged in the through hole 424 of first through hole 414 and second respectively.
Fig. 8 shows the structure of the fiber grating 200 in the utility model embodiment.With reference to shown in Fig. 6, Fig. 8, this practicality
In new embodiment, the middle part of fiber grating 200 is grating region 201, and the both ends of fiber grating 200 are individually fixed in first
The projection 42 of projection 41 and second, the end of the fiber grating 200 is solid in the first grating by the laser welding of joint 202 that metallizes
Determine the grating fixed groove 423 of groove 413 and second.Using metallization joint 202 by the projection 41 of fiber grating 200 and first and the
Two projections 42 carry out laser welding, may be such that the residual stress of fiber grating is small, it is more sensitive to connect more firm, precision.
In the utility model embodiment, the diaphragm 3 uses TC4 titanium alloy diaphragms.TC4 titanium alloy diaphragms may be such that in phase
With liquid level sensor under the influence of pressure, with that should change, big, hysteresis is more preferable, anti-fatigue ability is preferable, recovery is higher, resistance to
The advantages of corrosion.
Liquid level sensor of the present utility model is connected to (FBG) demodulator and ASE light sources.ASE light sources send optical signal and pass through coupling
The fiber grating entered after clutch by optical fiber in liquid level sensor, and reflected by fiber grating, moved into demodulation.When liquid level is passed
When sensor immerses fluid to be measured, fluid to be measured flows into the first space 11 by pod apertures 13, and then applies pressure to the diaphragm 3
Power so that diaphragm 3 produces deformation, because diaphragm 3 uses TC4 titanium alloy diaphragms, it is easy to produce strain after being under pressure, and
Hysteresis is more preferable, anti-fatigue ability is preferable, recovery is higher, corrosion-resistant, and then deformation quantity can be passed to projection component 4 first
The projection 42 of projection 41 and second so that the distance between the first projection 41 and the second projection 42 produce change, due to the first projection
41 and second projection 42 first through hole 414 and second through hole 424 be coaxially disposed, and then may be such that the light being fixed thereon
Fine grating can be deformed upon along the axial direction of oneself so that its grating constant changes, and then the light reflected
The Portable belt information of fluid pressure, the light of reflection is entered after (FBG) demodulator by optical fiber, is converted light signals into by (FBG) demodulator
Corresponding electric signal, and send computer part to, is handled by computer, to be reduced into corresponding wavelength value, and according to
The pressure value that the wavelength value and pressure gauge demodulated is obtained, and then obtain the information such as liquid level depth.In subsequent application, may be used also
So that multiple liquid level sensors of the present utility model are serially connected on the (FBG) demodulator of multiplexer channel, to constitute sensing detection network.
Liquid level sensor of the present utility model, the knot of first seal and second seal is respectively adopted using diaphragm both sides
Structure, and the mode being connected through a screw thread using fastener so that diaphragm both sides space completely cuts off completely, when diaphragm is located at liquid side
During by fluid pressure, liquid does not penetrate into the opposite side of diaphragm and pollutes the component of fiber grating therein.Utilize group of bumps
Part so that projection component is fixed at fiber grating two ends, and fiber grating center section is hanging, so whole fiber grating by
Power is uniform, it is to avoid fiber grating is directly bonded in the problem of stress distribution brought on diaphragm is uneven.Also, group of bumps
The use of part has been also convenient for more easily being pre-stretched when optical fiber is pasted, it is easier to fixed.Because diaphragm is adopted
With TC4 titanium alloy materials, the measurement accuracy of liquid level sensor is also drastically increased, in the experimental result table of 10 meters of depth of water
It is bright, liquid level sensor of the present utility model, when range is 10 meters, its full accuracy is up to 35.82nm/MPa (nanometer/million
Handkerchief), the measurement of different depth and precision is can apply to according to range, its linearity has reached 0.99949.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modifications, equivalent substitutions and improvements done etc. should be included in the utility model
Within the scope of protection.
Claims (9)
1. a kind of liquid level sensor, it is characterised in that including：
Cavity；
Cavity lid, the cavity lid is covered on the cavity, forms cavity space；
Diaphragm, the diaphragm is located in the cavity, and the cavity space is divided into mutual disconnected first space and second
Space, also, the diaphragm produces deformation with the pressure change in the first space；
Projection component, the projection component is fixed on the diaphragm towards the side of the second space；
Fiber grating, the fiber grating is installed on the projection component, when the diaphragm produces deformation, the projection component
Exerted a force to the fiber grating so that the fiber grating produces flexible；
Optical fiber, the optical fiber is connected to the fiber grating；Wherein,
The side wall that the cavity is located at the first space side offers pod apertures so that the containment portion liquid enters described the
One space；
The side wall that the cavity is located at second space side offers light path connecting hole, and the optical fiber with the light path by being connected
The connection terminal that hole matches is drawn out of described cavity and is connected to the signal detection apparatus of outside, wherein, the light path connects
Connect hole and the connection terminal is tightly connected.
2. liquid level sensor according to claim 1, it is characterised in that：
The madial wall of the cavity has boss；
The liquid level sensor also includes first seal, second seal and fastener, wherein：
The first seal, diaphragm and second seal are placed on the boss with stacking gradually；
The fastener is located at side of the second seal away from the diaphragm, also, the fastener is by described second
Seal, diaphragm, first seal press on the boss so that first space and second space are isolated.
3. liquid level sensor according to claim 2, it is characterised in that：
The cavity is the cylindrical shape that one end is closed；
The boss is the step that the cavity cylindrical inner the week side of boss extends to inside cavities；
The first seal and second seal are ring packing packing ring.
4. liquid level sensor according to claim 3, it is characterised in that：
The cavity inner wall has internal thread；
The fastener is annular shape, and the fastener has the external screw thread that the internal thread with the cavity inner wall matches,
The fastener coordinates the second seal, diaphragm, first seal pressing on the boss by screw thread.
5. liquid level sensor according to claim 3, it is characterised in that：
The openend that the cavity is located at cavity lid has external screw thread；
The cavity lid is cylindrical, and the cavity lid has the interior spiral shell that the external screw thread with the cavity hatch end matches
Line, the cavity lid coordinates to be covered on the cavity by screw thread.
6. liquid level sensor according to claim 5, it is characterised in that：
The chamber outer wall the week side of boss has the sealed groove towards the cavity lid；
Sealing ring is set in the sealed groove；
When the cavity lid is covered on the cavity, the edge of the open side of the cavity lid enters the sealed groove, and
It is resisted against the sealing ring.
7. liquid level sensor according to claim 1, it is characterised in that the projection component includes the first projection and second
Projection；Wherein,
There is first projection the first grating fixed part and the first grating to wear socket part；Wherein,
The first grating fixed part is fixed on the diaphragm, and the first grating fixed part is offered and the fiber grating
The the first grating fixed groove matched, with fiber grating described in holding；
First grating wears socket part and offers the first through hole matched with the fiber grating, with the fixed optical fiber light
Grid；
There is second projection the second grating fixed part and the second grating to wear socket part；Wherein,
The second grating fixed part is fixed on the diaphragm, and the second grating fixed part is offered and the fiber grating
The the second grating fixed groove matched, with fiber grating described in holding；
Second grating wears socket part and offers the second through hole matched with the fiber grating, with the fixed optical fiber light
Grid；
Wherein, the first through hole and second through hole are coaxially disposed, and the first grating fixed part and the second grating are fixed
Portion is oppositely arranged；
The two ends of the fiber grating wear and are fixed on the first through hole and the second through hole respectively.
8. liquid level sensor according to claim 7, it is characterised in that：
The end of the fiber grating is by the joint laser welding that metallizes in the first grating fixed groove and the second grating
Fixed groove.
9. liquid level sensor according to claim 1, it is characterised in that：
The diaphragm is TC4 titanium alloy diaphragms.
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|---|---|---|---|
| CN201621451882.4U CN206330646U (en) | 2016-12-28 | 2016-12-28 | A kind of liquid level sensor |
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| CN201621451882.4U CN206330646U (en) | 2016-12-28 | 2016-12-28 | A kind of liquid level sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109487318A (en) * | 2018-12-17 | 2019-03-19 | 河南师范大学 | A method of in untapered optical fiber end face, large area uniformly prepares gold nano disk array |
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2016
- 2016-12-28 CN CN201621451882.4U patent/CN206330646U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109487318A (en) * | 2018-12-17 | 2019-03-19 | 河南师范大学 | A method of in untapered optical fiber end face, large area uniformly prepares gold nano disk array |
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