CN110887837B - Optical fiber probe for measuring local parameters of high-temperature high-pressure two-phase flow and sealing structure and method thereof - Google Patents
Optical fiber probe for measuring local parameters of high-temperature high-pressure two-phase flow and sealing structure and method thereof Download PDFInfo
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- CN110887837B CN110887837B CN201911235797.2A CN201911235797A CN110887837B CN 110887837 B CN110887837 B CN 110887837B CN 201911235797 A CN201911235797 A CN 201911235797A CN 110887837 B CN110887837 B CN 110887837B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 150
- 239000000523 sample Substances 0.000 title claims abstract description 122
- 238000007789 sealing Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 36
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 118
- 239000010935 stainless steel Substances 0.000 claims abstract description 118
- 238000012360 testing method Methods 0.000 claims abstract description 55
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 239000000853 adhesive Substances 0.000 claims abstract description 20
- 230000001070 adhesive effect Effects 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims description 16
- 239000010453 quartz Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 229910052594 sapphire Inorganic materials 0.000 claims description 6
- 239000010980 sapphire Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000003286 fusion draw glass process Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 9
- 239000012530 fluid Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8405—Application to two-phase or mixed materials, e.g. gas dissolved in liquids
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- General Health & Medical Sciences (AREA)
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- Immunology (AREA)
- Pathology (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses an optical fiber probe for measuring local parameters of a high-temperature high-pressure two-phase flow, a sealing structure and a sealing method thereof, belonging to the technical field of two-phase flow measurement. The optical fiber probe body comprises a probe tip, a transmission optical fiber and various connecting components; the method has the advantages that the probe body is sealed by injecting high-temperature adhesive by adopting a two-layer stainless steel sleeve structure, and the probe testing tip can bear higher temperature and pressure; and the connecting part of the test pipeline is sealed by adopting a reducing two-way clamping sleeve joint and a stainless steel conduit. The invention optimizes the optical fiber probe method, expands the testing conditions of the optical fiber probe method, has simple structure, strong applicability and convenient adjustment, and solves the difficult problem of measuring the local parameters of the high-temperature high-pressure vapor-liquid two-phase flow.
Description
Technical Field
The invention relates to the technical field of two-phase flow measurement, in particular to an optical fiber probe for measuring local parameters of high-temperature high-pressure two-phase flow, and a sealing structure and a sealing method thereof.
Background
In many industrial facilities such as boiler water walls, steam generators, nuclear reactor cores, etc., the phenomenon of flow boiling is often accompanied. In these applications, boiling is typically performed in a tube flow regime, and as the resulting vapor is mixed into the liquid stream, a variety of different forms of two-phase flow structures appear, which presents difficulties in studying flow and heat transfer. In the research of the vapor-liquid two-phase flow, the local parameters such as void fraction, phase interface frequency, interface area concentration and the like occupy important positions, and are the basis for constructing a two-phase flow model.
These local parameters of the two-phase flow are difficult to obtain through theoretical calculation, and experimental measurement is the only reliable way, which is also a difficulty in the technical field of two-phase flow measurement. The existing methods for measuring the local parameters of the two-phase flow mainly comprise a high-speed photography method, a conductivity probe method, an optical fiber probe method, a hot wire (hot film) method, a capacitance method and the like.
The high-speed photography method is the most basic method for measuring the two-phase flow, has high measurement precision and flexible and changeable testing means, and is suitable for experimental study. But has high requirements on experimental section structures and experimental pipelines, and the workload of post-treatment is high. This method is difficult to measure directly in real time on line and is more difficult to implement under high temperature and high pressure conditions.
The hot wire (hot film) method is to place a thin metal wire (called a hot wire) heated by electricity in a fluid, and the heat dissipation amount of the hot wire in an air flow is related to a flow rate, and the heat dissipation amount causes a temperature change of the hot wire to cause a resistance change, so that a two-phase flow signal is converted into an electric signal. The capacitance method generally adopts non-invasive measurement, and a common capacitance sensor mainly comprises two electrodes which are generally in a semicircular or spiral structure and are arranged at the outer wall surface of a pipeline without being in direct contact with a medium. When the local gas content in the pipe changes, the capacitance value measured between the two electrodes changes due to the different dielectric constants of the two phases of media, and the capacitance measured value can be used for reflecting the change of the two-phase flow parameters after being processed by a data acquisition system. The measuring principle of the conductivity probe method is similar to that of a capacitance sensor, and the two-phase flow local parameters are identified by utilizing the difference of the resistivities of two-phase media, but the conductivity probe method is a contact type measuring method and is more flexible in the selection of measuring positions.
The above methods have limitations in practical applications. The three methods all need to electrify or heat the test part, have high requirements on the conductivity and the cleaning degree of the fluid, and are easy to be interfered by other equipment in actual use. It is difficult to achieve sufficient accuracy and stability under high temperature and high pressure test conditions.
Fiber optic probe methods are also one type of probe for making interventional measurements on two-phase fluids. The measuring principle of the optical fiber probe is to identify the gas phase and the liquid phase by utilizing the optical total reflection phenomenon, and the optical fiber probe can be distinguished whether the optical fiber probe is in the gas phase or the liquid phase by detecting electric signals with different heights generated by the intensity change of the light intensity reflected back to the receiving end by the optical fiber probe. The optical fiber probe method has outstanding advantages in measuring the local parameters of the two-phase flow, has stronger anti-interference capability of optical signals than electric signals, and has high stability in signal transmission; the response speed and the acquisition frequency of the optical fiber probe are very high, and can reach several MHz; the optical fiber probe has higher sensitivity, corrosion resistance, lower requirement on fluid physical properties and higher measurement precision, so the application range is wide.
In the vapor-liquid two-phase flow of industrial equipment, high temperature and high pressure are an unavoidable condition, which not only has high tolerance requirements on the material of the test element, but also provides great challenges for the selection of a measurement mode and the installation and sealing of the test element. In addition, the test pipelines of many devices are also complicated, such as a bar bundle channel, an annular channel and a narrow slit channel, which also needs more flexible test means of two-phase flow local parameters and has stronger adaptability.
Disclosure of Invention
In order to meet the requirements of the test conditions, the invention aims to provide the optical fiber probe for measuring the local parameters of the high-temperature and high-pressure two-phase flow, the sealing structure and the sealing method thereof, overcomes the defects of the traditional measurement of the local parameters of the two-phase flow, and provides a new technical support for the research of the gas-liquid two-phase flow under the conditions of high temperature and high pressure.
The invention aims at realizing the following technical scheme:
an optical fiber probe for measuring local parameters of high-temperature high-pressure two-phase flow and a sealing structure thereof comprise an optical fiber probe body, an optical fiber probe and test pipeline connecting structure and an optical fiber probe tail sealing structure, wherein the optical fiber probe and test pipeline connecting structure and the optical fiber probe tail sealing structure are used for realizing test connection and high-temperature high-pressure sealing of the optical fiber probe body on a pipeline;
the optical fiber probe body comprises a transmission optical fiber 2, a probe tip 1 positioned at the end part of the transmission optical fiber 2, a first layer of stainless steel sleeve 3 which is coated on the front part of the transmission optical fiber 2 and used for supporting and protecting the optical fiber, a second layer of stainless steel sleeve 5 which is coated on the rear part of the first layer of stainless steel sleeve 3 and the rear part of the transmission optical fiber 2, high-temperature adhesive glue filled in a gap between the transmission optical fiber 2 and the first layer of stainless steel sleeve 3 and used as a first layer of sealing structure 4, and high-temperature adhesive glue filled in a gap between the first layer of stainless steel sleeve 3 and the second layer of stainless steel sleeve 5 and used as a second layer of sealing structure 6; the optical fiber probe tail connecting structure comprises a connector main body 7, a rear housing 9 and an optical fiber protective sleeve 10 which are connected in sequence, and an extrusion sleeve 8 positioned at the centers of the connector main body 7, the rear housing 9 and the optical fiber protective sleeve 10; the rear end of the transmission optical fiber 2 penetrates into the extrusion sleeve 8, and the second layer of stainless steel sleeve 5 is inserted into the groove of the connector body 7 and fixed;
the optical fiber probe and test pipeline connecting structure comprises a test pipeline 11, a welding connecting piece 12 fixed on an opening of the test pipeline 11, a stainless steel conduit 14 into which the test end of the optical fiber probe body extends, and a first sealing clamping sleeve 13 sleeved on the stainless steel conduit 14 and connected with the welding connecting piece 12 to form a stainless steel conduit sealing point 18;
the optical fiber probe tail sealing structure comprises an optical fiber probe body testing end and a variable-diameter two-way connector 15, wherein the end part of a stainless steel catheter 14 extends into the optical fiber probe body testing end, a second sealing clamping sleeve 16 which is sleeved at one end of the variable-diameter two-way connector 15 and connected with the variable-diameter two-way connector 15 to form a stainless steel catheter sealing point II 19, and a third sealing clamping sleeve 17 which is sleeved at the other end of the variable-diameter two-way connector 15 and connected with the variable-diameter two-way connector 15 to form an optical fiber probe body sealing point 20.
The stainless steel guide tube 14 can freely change the length thereof, and flexible adjustment of the measuring position is realized.
The probe tip 1 and the transmission optical fiber 2 are made of quartz optical fibers, the quartz optical fibers are integrated, the diameter of the quartz optical fiber is 100-200 mu m, one end of each optical fiber is made into a cone shape by adopting a grinding method or a fusion drawing method, and the cone angle is 30-90 degrees; or the probe tip 1 is made of sapphire material into a conical shape with the cone angle and the diameter, the transmission optical fiber is quartz optical fiber, and the sapphire probe tip and the quartz transmission optical fiber are connected together through high-temperature adhesive glue.
The outer diameter of the first layer of stainless steel sleeve 3 is 0.5-1mm, and the outer diameter of the second layer of stainless steel sleeve 5 is 1-3mm.
The outer diameter of the stainless steel conduit 14 is 3-6mm, the specific dimensions being dependent on the outer diameter of the second layer of stainless steel casing 5.
The connection method of the optical fiber probe and the sealing structure thereof for measuring the local parameters of the high-temperature high-pressure two-phase flow comprises the following steps:
(1) Selecting a first layer of stainless steel sleeve 3 according to the condition of the test position, and inserting the processed transmission optical fiber 2 with the probe tip 1 into the first layer of stainless steel sleeve 3;
(2) Using a micro-injector to inject waterproof high-temperature adhesive into the gap between the transmission optical fiber 2 and the first layer stainless steel sleeve 3, so as to form a first layer sealing structure 4;
(3) Determining the specification of a second-layer stainless steel sleeve 5, inserting the first-layer stainless steel sleeve 3 into the second-layer stainless steel sleeve 5, injecting waterproof high-temperature adhesive into a gap between the first-layer stainless steel sleeve 3 and the second-layer stainless steel sleeve 5 by using a micro-injector, and solidifying the waterproof high-temperature adhesive to finish a second-layer sealing structure 6;
(4) The connector main body 7, the extrusion sleeve 8, the rear housing 9 and the optical fiber protective sleeve 10 are sequentially connected, a groove matched with the second layer of stainless steel sleeve 5 is formed in the connector main body 7, the second layer of stainless steel sleeve 5 is inserted into the groove, and the part does not need to bear high temperature and high pressure and can be bonded by using common bonding glue;
(5) Selecting a stainless steel conduit 14, a welding connector 12 and a reducing two-way joint 15, determining the length of the stainless steel conduit according to the test position and the length of the optical fiber probe body, and inserting the test end of the optical fiber probe body into the stainless steel conduit 14;
(6) The testing pipeline 11 is provided with a hole, the welding connecting piece 12 is welded, and the first sealing clamping sleeve 13 is connected, so that a first stainless steel catheter sealing point 18 is completed;
(7) The optical fiber probe body is inserted into the variable-diameter two-way joint 15, the sealing point 20 of the optical fiber probe body is determined according to the measuring position and the length of the stainless steel catheter 14, and the optical fiber probe body is screwed to finish sealing;
(8) And connecting the other side of the reducing two-way joint 15 with the stainless steel guide pipe 14 to finish the sealing of the stainless steel guide pipe sealing point II 19, thereby finishing the sealing of all structures.
Compared with the prior art, the invention has the following innovation points:
(1) The optical fiber probe can measure the local parameters of the vapor-liquid two-phase flow, the maximum diameter of the tip of the optical fiber probe is 100-200 mu m, the outer diameter of the pressure-bearing stainless steel catheter is 0.5-1mm, and the interference to the fluid in the testing process is reduced as much as possible;
(2) The nested structure of the double-layer stainless steel tube is provided, the structure effectively ensures the bearing and sealing of the probe test part, the length of the stainless steel tube can be freely adjusted, and the selection of the test position is more flexible;
(3) The sealing structure of the diameter-variable two-way clamping sleeve joint can realize the sealing of the optical fiber probe body and the test tube section under the high-temperature and high-pressure conditions.
The embodiment of the invention optimizes the optical fiber probe aiming at the difficult problem of measuring the local parameters of the high-temperature high-pressure vapor-liquid two-phase flow. By adopting the optical fiber probe, the measurement of local parameters in the test pipeline can be flexibly realized, and the sealing under the conditions of high temperature and high pressure is ensured. The invention has important significance for researching high-temperature high-pressure vapor-liquid two-phase flow.
Drawings
FIG. 1 is a schematic diagram of a fiber probe body according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection structure of an optical fiber probe according to an embodiment of the present invention applied to a high-temperature and high-pressure test pipeline;
fig. 3 is a schematic view of a ferrule sealing structure provided by an example of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The embodiment of the invention provides an optical fiber probe for measuring local parameters of high-temperature high-pressure two-phase flow and a sealing structure thereof, and fig. 1 is a schematic diagram of an optical fiber probe body structure for describing connection and sealing of the optical fiber probe body. The probe mainly comprises a probe tip 1, a transmission optical fiber 2, a first layer stainless steel sleeve 3, a first layer sealing structure 4 between the first layer stainless steel sleeve 3 and the transmission optical fiber 2, a second layer stainless steel sleeve 5, a second layer sealing structure 6 between the second layer stainless steel sleeve 5 and the first layer stainless steel sleeve 3, a connector main body 7, an extrusion sleeve 8, a rear housing 9 and an optical fiber protection sleeve 10.
Optionally, the probe tip 1 and the transmission optical fiber 2 are both quartz optical fibers, the two are integrated, the diameter is 100-200 μm, one end of the optical fiber is made into a cone shape by adopting a grinding method or a fusion drawing method, and the cone angle is 30-90 degrees;
optionally, the probe tip 1 is made of sapphire material, and is processed into a conical shape with the cone angle and the diameter; the transmission optical fiber 2 is a quartz optical fiber, and the tip of the sapphire probe is connected with the quartz transmission optical fiber through high-temperature adhesive;
optionally one of the two probe tip forms.
The transmission optical fiber 2 passes through a first layer of stainless steel sleeve 3, the sleeve plays a role in supporting and protecting the optical fiber, and high-temperature adhesive glue is filled in a gap between the first layer of stainless steel sleeve 3 and the transmission optical fiber 2 to serve as a first layer of sealing structure 4 of the optical fiber probe; because the filling gap is narrow and the length of the conduit is longer, the structure can effectively bear the high-temperature and high-pressure environment of the test pipeline.
The first layer of stainless steel sleeve 3 passes through the second layer of stainless steel sleeve 5, and high-temperature adhesive is filled between the two layers of stainless steel sleeves to serve as a second layer of sealing structure 6 of the optical fiber probe; the structure is also a sealing boundary between the optical fiber probe body and the test pipeline, and the two-layer sealing structure is double-insurance of bearing pressure of the optical fiber probe.
The transmission optical fiber 2 sequentially passes through the connector body 7, the extrusion sleeve 8, the rear housing 9, the optical fiber protecting jacket 10, and reaches the signal processing part, and the second layer of stainless steel sleeve 5 is inserted into the groove of the connector body 7 and fixed by using adhesive.
The above is the connection and sealing structure of the optical fiber probe body.
Fig. 2 is a schematic diagram of a connection structure of an optical fiber probe applied to a high-temperature and high-pressure test tube according to an embodiment of the present invention, for describing a connection structure between an optical fiber probe body and a test tube and a sealing manner thereof. The optical fiber probe and test pipeline connecting structure comprises a test pipeline 11, a welding connector 12, a first sealing clamping sleeve 13 and a stainless steel guide pipe 14, and the optical fiber probe tail sealing structure comprises a reducing two-way joint 15, a second sealing clamping sleeve 16 and a third sealing clamping sleeve 17.
The optical fiber probe method is an interventional measurement, an opening is needed on a test pipeline, the welding connecting piece 12 is welded with the test pipeline 11, and the other end of the welding connecting piece 12 is of a cutting sleeve sealing structure.
The welding connector 12 and the reducing two-way joint 15 are connected by the stainless steel guide pipe 14, and the stainless steel guide pipe can protect the optical fiber probe body on one hand and can freely change the length on the other hand, so that the flexible adjustment of the measuring position is realized.
The optical fiber probe body is sequentially inserted into the variable-diameter two-way joint 15 and the stainless steel guide pipe 14, and the variable-diameter two-way joint 15 is respectively sealed with the stainless steel guide pipe 14 and the optical fiber probe body.
Fig. 3 is a schematic view of the ferrule sealing structure shown in fig. 2, and mainly includes a welding connector 12, a first sealing ferrule 13, a stainless steel conduit 14, a reducing two-way joint 15, a stainless steel conduit sealing point one 18, a stainless steel conduit sealing point two 19, and an optical fiber probe body sealing point 20.
The first stainless steel conduit sealing point 18 and the second stainless steel conduit sealing point 19 are positioned on two sides of the stainless steel conduit 14, two ends of the stainless steel conduit 14 are propped against steps in the welding connector 12, and the length of the stainless steel conduit can be determined according to the length of the probe body and the selection of the measuring position.
The optical fiber probe body sealing point 20 is positioned on the second layer of stainless steel sleeve 5, and the optical fiber probe body taking the second layer of stainless steel sleeve 5 as a peripheral protection layer integrally passes through the reducing two-way joint 15 and the stainless steel catheter 14 to reach the optical fiber probe tip test position.
The optical fiber probe for measuring the local parameters of the high-temperature and high-pressure two-phase flow and the sealing structure thereof take the local parameters of the center of a certain high-temperature and high-pressure circular tube channel as examples, and the specific operation and installation steps are as follows:
(1) According to the condition of the test position, selecting a first layer of stainless steel sleeve 3, wherein in the embodiment, the stainless steel sleeve with the outer diameter of 1mm and the inner diameter of 0.5mm is selected; inserting the processed quartz transmission optical fiber 1 with the probe tip 2 into the first layer of stainless steel sleeve 3, and penetrating out the probe tip 1 by about 2mm;
(2) Using a micro injector to inject waterproof high-temperature adhesive into a gap between the quartz transmission optical fiber 2 and the first layer stainless steel sleeve 3, so that the gap is slowly solidified to complete the first layer sealing structure 4;
(3) Determining the specification of a second layer of stainless steel sleeve 5, selecting a stainless steel sleeve with the outer diameter of 2mm and the inner diameter of 1.5mm, inserting the first layer of stainless steel sleeve 3 into the second layer of stainless steel sleeve 5, and penetrating the probe tip 1 by about 20mm; using a micro injector to inject waterproof high-temperature adhesive into the gap between the first layer of stainless steel sleeve 3 and the second layer of stainless steel sleeve 5, so as to slowly solidify the gap to complete the second layer of sealing structure 6;
(4) The connector main body 7, the extrusion sleeve 8, the rear housing 9 and the optical fiber protective sleeve 10 are sequentially connected, a groove matched with the second layer of stainless steel sleeve 5 is formed in the connector main body 7, the second layer of stainless steel sleeve 5 is just inserted into the groove, and the part does not need to bear high temperature and high pressure and can be formed by using common adhesive;
(5) Selecting a stainless steel conduit 14 with the length of 6mm, a welding connector 12 with the length of 6mm, a reducing two-way joint 15 with the length of 3mm to which 6mm is converted, determining the length of the stainless steel conduit according to the test position and the length of the optical fiber probe body, and inserting the test end of the optical fiber probe body into the stainless steel conduit 14;
(6) A hole of 6mm is formed in the test pipeline 11, a welding connector 12 is welded, and a first sealing clamping sleeve 13 is connected, so that a stainless steel catheter sealing point I18 is completed;
(7) The optical fiber probe body is inserted into the variable-diameter two-way joint 15, the sealing point 20 of the optical fiber probe body is determined according to the measuring position and the length of the stainless steel catheter 14, and the optical fiber probe body is screwed to finish sealing;
(8) The 6mm side of the reducing two-way joint 15 is connected with the stainless steel pipe 14 to complete the sealing of the stainless steel pipe sealing point II 19, so as to complete the sealing of all structures.
The optical fiber probe for measuring the local parameters of the high-temperature high-pressure two-phase flow and the sealing structure thereof mainly comprise structures and connection processes.
The embodiment of the invention optimizes the optical fiber probe method, expands the testing conditions of the optical fiber probe method, and solves the difficult problem of measuring the local parameters of the high-temperature high-pressure vapor-liquid two-phase flow.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. The optical fiber probe for measuring the local parameters of the high-temperature high-pressure two-phase flow and the sealing structure thereof are characterized by comprising an optical fiber probe body, an optical fiber probe and test pipeline connecting structure and an optical fiber probe tail sealing structure, wherein the optical fiber probe body is used for realizing test connection of the optical fiber probe body on a pipeline and sealing at high temperature and high pressure;
the optical fiber probe body comprises a transmission optical fiber (2), a probe tip (1) positioned at the end part of the transmission optical fiber (2), a first layer of stainless steel sleeve (3) which is coated on the front part of the transmission optical fiber (2) and used for supporting and protecting the optical fiber, and a second layer of stainless steel sleeve (5) which is coated on the rear part of the first layer of stainless steel sleeve (3) and the rear part of the transmission optical fiber (2), wherein a gap between the transmission optical fiber (2) and the first layer of stainless steel sleeve (3) is filled with high-temperature adhesive, the gap between the first layer of stainless steel sleeve (3) and the second layer of stainless steel sleeve (5) is filled with high-temperature adhesive, and the gap is used as a second layer of sealing structure (6); the optical fiber probe tail connecting structure comprises a connector main body (7), a rear housing (9) and an optical fiber protective sleeve (10) which are connected in sequence, and an extrusion sleeve (8) positioned at the centers of the connector main body (7), the rear housing (9) and the optical fiber protective sleeve (10); the rear end of the transmission optical fiber (2) penetrates into the extrusion sleeve (8), and the second layer of stainless steel sleeve (5) is inserted into the groove of the connector main body (7) and fixed;
the optical fiber probe and test pipeline connecting structure comprises a test pipeline (11), a welding connecting piece (12) fixed on an opening of the test pipeline (11), a stainless steel conduit (14) in which the test end of the optical fiber probe body extends, and a first sealing clamping sleeve (13) sleeved on the stainless steel conduit (14) and connected with the welding connecting piece (12) to form a stainless steel conduit sealing point I (18);
the optical fiber probe tail sealing structure comprises an optical fiber probe body testing end and a variable-diameter two-way connector (15) in which the end part of a stainless steel catheter (14) extends, wherein the variable-diameter two-way connector is sleeved with a second sealing clamping sleeve (16) which is connected with the variable-diameter two-way connector (15) at one end of the variable-diameter two-way connector (15) to form a stainless steel catheter sealing point II (19), and the other end of the variable-diameter two-way connector (15) is sleeved with a third sealing clamping sleeve (17) which is connected with the variable-diameter two-way connector (15) to form an optical fiber probe body sealing point (20);
the probe tip (1) and the transmission optical fiber (2) are made of quartz optical fibers, the quartz optical fibers are integrated, the diameter of the quartz optical fiber is 100-200 mu m, one end of the optical fiber is made into a cone shape by adopting a grinding method or a fusion drawing method, and the cone angle is 30-90 degrees; or the probe tip (1) is made of sapphire material and is processed into a cone shape with the cone angle and the diameter, the transmission optical fiber is a quartz optical fiber, and the sapphire probe tip and the quartz transmission optical fiber are connected together through high-temperature adhesive glue;
the outer diameter of the first layer of stainless steel sleeve (3) is 0.5-1mm, and the outer diameter of the second layer of stainless steel sleeve (5) is 1-3mm.
2. The optical fiber probe for measuring the local parameters of the high-temperature high-pressure two-phase flow and the sealing structure thereof according to claim 1 are characterized in that the length of the stainless steel conduit (14) can be freely changed, and flexible adjustment of the measuring position is realized.
3. The optical fiber probe for measuring local parameters of high-temperature high-pressure two-phase flow and the sealing structure thereof according to claim 1, wherein the outer diameter of the stainless steel conduit (14) is 3-6mm.
4. A connection method of an optical fiber probe for high temperature and high pressure two-phase flow local parameter measurement and a sealing structure thereof according to any one of claims 1 to 3, characterized by comprising the steps of:
selecting a first layer of stainless steel sleeve (3) according to the condition of a test position, and inserting the processed transmission optical fiber (2) with the probe tip (1) into the first layer of stainless steel sleeve (3);
(2) Injecting waterproof high-temperature adhesive into a gap between the transmission optical fiber (2) and the first layer stainless steel sleeve (3) by using a micro injector, and solidifying the gap to form a first layer sealing structure (4);
(3) Determining the specification of a second-layer stainless steel sleeve (5), inserting the first-layer stainless steel sleeve (3) into the second-layer stainless steel sleeve (5), injecting waterproof high-temperature adhesive into a gap between the first-layer stainless steel sleeve (3) and the second-layer stainless steel sleeve (5) by using a micro injector, and solidifying the waterproof high-temperature adhesive to finish a second-layer sealing structure (6);
(4) Sequentially connecting a connector main body (7), an extrusion sleeve (8), a rear housing (9) and an optical fiber protective sleeve (10), wherein a groove matched with the second layer of stainless steel sleeve (5) is formed in the connector main body (7), the second layer of stainless steel sleeve (5) is inserted into the groove, and the part does not need to bear high temperature and high pressure and can be bonded by using common bonding glue;
(5) Selecting a stainless steel conduit (14), a welding connector (12) and a reducing two-way joint (15), determining the length of the stainless steel conduit according to the test position and the length of the optical fiber probe body, and inserting the test end of the optical fiber probe body into the stainless steel conduit (14);
(6) The testing pipeline (11) is provided with an opening, a welding connecting piece (12) is welded on and connected with a first sealing clamping sleeve (13), and a first stainless steel conduit sealing point (18) is completed;
(7) Inserting the optical fiber probe body into a variable-diameter two-way joint (15), determining an optical fiber probe body sealing point (20) according to the measuring position and the length of the stainless steel catheter (14), and screwing to finish sealing;
(8) And connecting the other side of the reducing two-way joint (15) with the stainless steel guide pipe (14) to finish a sealing point II (19) of the stainless steel guide pipe, thereby finishing the sealing of all structures.
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| US11585698B2 (en) * | 2019-09-16 | 2023-02-21 | Photon Control Inc. | Fiber optic temperature probe |
| CN111879347B (en) * | 2020-07-15 | 2022-05-20 | 中国核动力研究设计院 | Sealing element structure and device of two-phase flow fine measurement device under high temperature and high pressure |
| CN112649039B (en) * | 2020-11-06 | 2023-06-27 | 重庆大学 | Multi-probe conductance probe for high-temperature high-pressure two-phase flow detection and manufacturing method thereof |
| CN114777585B (en) * | 2022-03-22 | 2023-05-02 | 中国工程物理研究院流体物理研究所 | Fixing device and method for detonator action time measurement |
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