CN218443986U - Fiber grating target flowmeter based on special-shaped equal-strength beam - Google Patents
Fiber grating target flowmeter based on special-shaped equal-strength beam Download PDFInfo
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- CN218443986U CN218443986U CN202221756560.6U CN202221756560U CN218443986U CN 218443986 U CN218443986 U CN 218443986U CN 202221756560 U CN202221756560 U CN 202221756560U CN 218443986 U CN218443986 U CN 218443986U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract
The utility model discloses a fiber grating target flowmeter based on special-shaped equal strength beam, by special-shaped equal strength beam, first grating, second grating, sealed lid, the jar body, the briquetting, water supply connector and water outlet joint constitute, wherein, special-shaped equal strength beam end is equipped with the target dish that is used for feeling rivers, special-shaped equal strength beam should be made with the better metal of elasticity, and, special-shaped equal strength beam is concatenated from top to bottom by two equal strength beams of different sizes and is constituteed, make the flow act on the target dish and arouse that the strain on two equal strength beams has great difference; the first grating and the second grating are connected in series up and down and are respectively arranged on the surfaces of the two equal-strength beams, and the positions of the grating regions are respectively located at the positions where the strain distribution of the two equal-strength beams is uniform. The utility model discloses simple structure, the encapsulation is simple and convenient, and is small, and the universality is strong to have the temperature real-time compensation function.
Description
The technical field is as follows:
the utility model relates to an optical fiber sensing field, concretely relates to fiber grating target flowmeter based on special-shaped uniform strength roof beam.
Background art:
the flowmeter is widely applied in industrial and agricultural production, and common flowmeters mainly comprise: mechanical rotameters, differential pressure meters, vortex shedding meters, electromagnetic flowmeters, ultrasonic flowmeters and the like, but all have different defects, such as low precision of the mechanical rotameters, large volume of the differential pressure meters, complex structure of the vortex shedding meters, easy electromagnetic interference of the electromagnetic flowmeters, high cost of the ultrasonic flowmeters and the like.
The utility model has the following contents:
the utility model aims to solve the technical problem that a fiber grating target flowmeter based on special-shaped uniform strength roof beam is provided to solve above-mentioned technical problem.
The technical solution of the utility model is to provide a fiber grating target flowmeter based on a special-shaped equal-strength beam, which comprises a special-shaped equal-strength beam, a first grating, a second grating, a sealing cover, a tank body, a pressing block, a water inlet joint and a water outlet joint, wherein,
the tail end of the special-shaped constant-strength beam is provided with a target disc for sensing water flow, the special-shaped constant-strength beam is preferably made of metal with better elasticity, and the special-shaped constant-strength beam is formed by connecting two constant-strength beams with different sizes in series up and down, so that the strain on the two constant-strength beams caused by the flow acting on the target disc has larger difference;
the first grating and the second grating are connected in series up and down and are respectively arranged on the surfaces of the two equal-strength beams, and the positions of the grating regions are respectively positioned at the positions of the two equal-strength beams with uniform strain distribution;
the special-shaped equal-strength beam is fixed on the sealing cover, and the sealing cover and the tank body form a liquid cavity of the target flowmeter;
the water inlet joint and the water outlet joint are communicated with the lower end of the tank body, the water inlet joint and the water outlet joint are respectively connected with a water inlet and a water outlet of a water pipe to be tested, and the target disc of the special-shaped equal-strength beam is concentric with the inner circle of the water inlet joint.
Preferably, the special-shaped equal-strength beam is composed of two equal-strength beams with different shapes, and the two equal-strength beams and the target disc are integrally machined. The flow acting on the target disk causes a large difference in the strain on the two equal strength beams.
Preferably, the first grating and the second grating are connected in series up and down and are respectively adhered to one surface of the two equal-strength beams.
Preferably, the special-shaped equal-strength beam is fixed on the sealing cover through a pressing block, and the surface of the special-shaped equal-strength beam is perpendicular to the water flow direction.
Preferably, the water inlet joint, the water outlet joint and the tank body are tightly screwed and sealed by winding the raw material belt through standard threads. The sealing cover, the water inlet joint, the water outlet joint, the tail fiber of the grating and the tank body are sealed to have pressure resistance capable of bearing the pressure of a pipeline to be measured.
Preferably, in order to make the strain difference between the two beams in the special-shaped equal-strength beam as large as possible, the ratio of the length to the width of each of the two equal-strength beams is not less than 2:1.
preferably, in order to ensure that the water flow completely acts on the target disc, the inner diameter of the water inlet joint is not larger than the diameter of the target disc; in order to ensure smooth water outlet, the inner diameter of the water outlet joint is not less than that of the water inlet joint.
When the target type flowmeter works, the target type flowmeter is connected into a water pipe to be detected through a water inlet connector and a water outlet connector, and the grating tail fiber is connected with the fiber grating demodulator to demodulate signals. When the water pipe to be measured generates water flow, the water flow impacts the target disc, and the impact force enables the target disc to generate certain deflection. Because the two equal-strength beams on the special-shaped equal-strength beam have different structures and have different strain quantities caused by the deflection of the tail end target disk, the wavelength drift quantities of the two gratings caused by the change of the strain quantities are different. However, the two are basically in the same environment, namely the wavelength drifts caused by the change of the environmental temperature are basically the same, so the influence of the temperature change can be removed by making the wavelength drifts of the two different, and the problem of temperature cross sensitivity is solved. When the water flow is gradually increased, the wavelength drift amount of the first grating is far larger than that of the second grating, and a specific relation exists between the difference of the two drift amounts and the flow rate. Therefore, when the difference of the wavelength drift amounts of the two gratings is measured, the flow rate can be reversely deduced. It should be noted that the surface of the structure of the target flowmeter, which is in contact with the liquid to be measured during operation, should be treated with rust and corrosion prevention.
Compared with the prior art after the scheme more than adopting, the utility model has the advantages of it is following:
(1) Temperature real-time compensation: the two gratings are in basically the same environment, the strain sensitivities have larger difference, and the wavelength drift amounts of the two gratings are differed to obtain parameters which are irrelevant to temperature and only relevant to flow, so that real-time temperature compensation is realized.
(2) Simple structure, the encapsulation is simple and convenient: the core component in the scheme is a special-shaped equal-strength beam adhered with two gratings. The special-shaped equal-strength beam can be machined by using a ready-made stainless steel plate; in the grating packaging process, only a certain amount of pretension force is needed to be applied and then the grating is adhered by using an adhesive. The whole structure is simple, the encapsulation is simple and convenient, and the yield is high.
(3) Small size and strong universality: the whole volume of this flowmeter is less, only needs during the use to connect according to the corresponding water supply connector of water pipe size adaptation and go out the water swivel, can conveniently insert and carry out flow monitoring in the water pipe. The type of the measured liquid is not selected, and the special-shaped equal-strength beam, the tank body structure and the like can be correspondingly protected only according to the characteristics of the liquid, such as corrosivity, temperature and the like.
Description of the drawings:
fig. 1 is the structure schematic diagram of the fiber grating target flowmeter based on the special-shaped equal-strength beam of the utility model.
Fig. 2 is the structural schematic diagram of the special-shaped equal-strength beam and the grating pasting structure of the utility model.
Fig. 3 is the working principle schematic diagram of the fiber grating target flowmeter based on the special-shaped equal-strength beam of the utility model.
Fig. 4 is the strain distribution simulation result of the special-shaped equal-strength beam after the deflection is applied to the tail end of the utility model.
The specific implementation mode is as follows:
the invention will be further described with respect to specific embodiments in conjunction with the following drawings:
as shown in fig. 1-3, the fiber grating target flowmeter based on the special-shaped uniform strength beam comprises a special-shaped uniform strength beam 1, a first grating 2, a second grating 3, a sealing cover 4, a tank body 5, a pressing block 6, a water inlet connector 7 and a water outlet connector 8. Wherein, the first and the second end of the pipe are connected with each other,
the special-shaped equal-strength beam 1 consists of two equal-strength beams with different sizes, the structures of the beams can be the same or different, in the embodiment, the size of the upper equal-strength beam in the two equal-strength beams arranged up and down is larger than that of the lower equal-strength beam, the tail end of the special-shaped equal-strength beam 1 is provided with a target disc 9 used for sensing water flow, and the two equal-strength beams and the target disc 9 are integrally processed;
the first grating 2 and the second grating 3 are connected in series up and down and are respectively adhered to one surface of two equal-strength beams of the special-shaped equal-strength beam 1, and the positions of the grating regions are respectively located at the positions where the strain distribution of the two equal-strength beams is uniform;
the special-shaped equal-strength beam 1 is fixed on the sealing cover 4 through the pressing block 6, the sealing cover 4 and the tank body 5 jointly form a liquid cavity of the target type flowmeter, namely, the sealing cover 4 is covered at an opening at the upper end of the tank body 5, one ends of the water inlet connector 7 and the water outlet connector 8 are respectively connected with a water inlet and a water outlet of a water pipe to be measured, the other ends of the water inlet connector 7 and the water outlet connector 8 are hermetically communicated with two sides of the lower end of the tank body 5, and a target disc 9 of the special-shaped equal-strength beam 1 is concentric with the inner circle of the water inlet connector 8.
According to the equal-strength beam theory:
where ε is the amount of strain on the beam, F is the force applied at the end of the beam, L is the length of the beam, E is the modulus of elasticity of the beam, B is the width of the beam, and h is the thickness of the beam. It can be seen that the magnitude of the strain on the beam is directly proportional to the length of the beam and inversely proportional to the width and thickness of the beam. Under the condition that the thickness of the beams is the same and the magnitude of the end force is constant, in order to make the strain difference of two equal-strength beams in the special-shaped equal-strength beam 1 as large as possible, the ratio of the length to the width of the two beams is respectively not less than 2:1.
as shown in fig. 4, when a force of a certain magnitude is applied to the beam ends, the strain amounts where the two equal strength beams are uniformly distributed are about 98 μ e and 35 μ e, respectively, and the corresponding grating wavelength drifts are about 118pm and 42pm, respectively. When the two wavelength drifts are differed to realize temperature real-time compensation, the wavelength drift amount can still reach 76pm, so that the flowmeter has higher sensitivity and lays a foundation for high-precision flow measurement.
The irregular equal-strength beam 1 needs to be subjected to working procedures of deoiling, decontamination, polishing and the like on the pasting surface before the first grating 2 and the second grating 3 are pasted, and the pasting reliability is improved as much as possible. The first grating 2 and the second grating 3 should both apply a certain amount of pretension force, so that the stretching or shrinking after the sticking is always in a linear range.
The special-shaped equal-strength beam 1 is clamped and fixed left and right by two pressing blocks 6 in advance, and then the pressing blocks 6 and the sealing cover 4 are assembled and fixed. And (4) after the tail fiber of the grating is output through the small hole in the sealing cover 4, sealing the small hole by using a sealant. The sealing cover 4 and the tank body 5 are radially sealed through a sealing ring, and the water inlet connector 7, the water outlet connector 8 and the tank body 5 are tightly screwed and sealed through standard thread winding raw material belts. In order to ensure that the water flow completely acts on the target disc 9, the inner diameter of the water inlet joint 7 is not larger than the diameter of the target disc 9; in order to ensure smooth water outlet, the inner diameter of the water outlet joint 8 is not less than that of the water inlet joint 7.
During the use, the fiber grating target flowmeter based on special-shaped uniform strength beam inserts the pipeline that awaits measuring through the mode of the hose that the switching size matches, and the mode that accessible staple bolt locking is sealed between hose and water supply connector 7, the water outlet connector 8. When flow is generated, liquid impacts a target disc 9 of the special-shaped equal-strength beam 1 to enable the tail end of the beam to generate deflection change with a certain size, so that the two gratings are driven to generate wavelength drift with different degrees, and the flow can be reversely deduced by detecting the wavelength drift difference of the two gratings.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. All utilize the utility model discloses equivalent structure or equivalent flow transform that the specification was done all are included within the patent protection scope of the utility model.
Claims (7)
1. The utility model provides a fiber grating target flowmeter based on special-shaped uniform strength roof beam which characterized in that: comprises a special-shaped equal-strength beam (1), a first grating (2), a second grating (3), a sealing cover (4), a tank body (5), a pressing block (6), a water inlet joint (7) and a water outlet joint (8),
the tail end of the special-shaped equal-strength beam (1) is provided with a target disc (9) for sensing water flow, and the special-shaped equal-strength beam (1) is formed by connecting two equal-strength beams with different sizes in series up and down;
the first grating (2) and the second grating (3) are connected in series up and down and are respectively arranged on the surfaces of the two equal-strength beams, and the positions of the grating regions are respectively positioned at the positions where the strain of the two equal-strength beams is uniformly distributed;
the special-shaped equal-strength beam (1) is fixed on a sealing cover (4), and the sealing cover (4) and the tank body (5) jointly form a liquid cavity of the target flowmeter;
the water inlet joint (7) and the water outlet joint (8) are communicated with the lower end of the tank body, and the target disc (9) of the special-shaped equal-strength beam (1) is concentric with the inner circle of the water inlet joint (7).
2. The fiber grating target flowmeter based on the beam with the special shape and the equal strength as claimed in claim 1, characterized in that: the two equal-strength beams and the target disc (9) are integrally processed.
3. The fiber grating target flowmeter based on the special-shaped uniform strength beam as claimed in claim 2, wherein: the first grating (2) and the second grating (3) are connected in series up and down and are respectively adhered to one surface of the two beams (1) with equal strength.
4. The fiber grating target flowmeter based on the beam with the special shape and the equal strength as claimed in claim 1, characterized in that: the special-shaped uniform-strength beam (1) is fixed on the sealing cover (4) through the pressing block (6), and the surface of the special-shaped uniform-strength beam (1) is perpendicular to the water flow direction.
5. The fiber grating target flowmeter based on the special-shaped uniform strength beam as claimed in claim 1, wherein: the water inlet joint (7), the water outlet joint (8) and the tank body (5) are tightly screwed and sealed by winding the raw material belt through standard threads.
6. The fiber grating target flowmeter based on the beam with the special shape and the equal strength as claimed in claim 2, characterized in that: the ratio of the length to the width of the two equal-strength beams is not less than 2:1.
7. the fiber grating target flowmeter based on the special-shaped uniform strength beam as claimed in claim 1, wherein: the inner diameter of the water inlet joint (7) is not more than the diameter of the target disc (9); the inner diameter of the water outlet joint (8) is not less than that of the water inlet joint (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221756560.6U CN218443986U (en) | 2022-07-07 | 2022-07-07 | Fiber grating target flowmeter based on special-shaped equal-strength beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221756560.6U CN218443986U (en) | 2022-07-07 | 2022-07-07 | Fiber grating target flowmeter based on special-shaped equal-strength beam |
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| Publication Number | Publication Date |
|---|---|
| CN218443986U true CN218443986U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221756560.6U Active CN218443986U (en) | 2022-07-07 | 2022-07-07 | Fiber grating target flowmeter based on special-shaped equal-strength beam |
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| CN (1) | CN218443986U (en) |
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2022
- 2022-07-07 CN CN202221756560.6U patent/CN218443986U/en active Active
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