CN110887837A - Optical fiber probe for measuring local parameters of high-temperature and high-pressure two-phase flow and sealing structure and method thereof - Google Patents
Optical fiber probe for measuring local parameters of high-temperature and high-pressure two-phase flow and sealing structure and method thereof Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 142
- 239000000523 sample Substances 0.000 title claims abstract description 123
- 238000007789 sealing Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 36
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 120
- 239000010935 stainless steel Substances 0.000 claims abstract description 120
- 238000012360 testing method Methods 0.000 claims abstract description 55
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 239000003292 glue Substances 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims description 16
- 239000010453 quartz Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 9
- 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
- 239000007788 liquid Substances 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 54
- 239000000835 fiber Substances 0.000 description 7
- 239000012530 fluid Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009835 boiling Methods 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
- 238000011160 research Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003286 fusion draw glass process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 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
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 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
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- 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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Abstract
The invention discloses an optical fiber probe for measuring local parameters of high-temperature and high-pressure two-phase flow, and a sealing structure and a 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 connecting parts; the probe body is sealed by injecting high-temperature adhesive glue into a two-layer stainless steel sleeve structure, and the method enables the probe testing tip to bear higher temperature and pressure; and the connecting part of the test pipeline is sealed by adopting the reducing two-way ferrule connector and the stainless steel guide pipe. The invention optimizes the optical fiber probe method, expands the test conditions of the optical fiber probe method, has simple structure, strong applicability and convenient adjustment, and solves the problem of measuring local parameters of high-temperature and 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 and high-pressure two-phase flow and a sealing structure and a method thereof.
Background
In many industrial facilities such as boiler waterwalls, steam generators, nuclear reactor cores, etc., a phenomenon of flow boiling is often accompanied. In these applications, boiling is usually carried out in a tube flow regime, and as the resulting vapor is mixed into the liquid stream, a number of different forms of two-phase flow configurations arise, presenting difficulties in studying flow and heat transfer. In the research of the gas-liquid two-phase flow, 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.
The 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 the difficulty in the technical field of two-phase flow measurement. The current methods for measuring two-phase flow local parameters mainly comprise a high-speed photography method, a conductance 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 two-phase flow, has high measurement precision and flexible and variable test means, and is suitable for experimental research. But the requirements on the structure of the experimental section and the experimental pipeline are very high, and the workload of post-processing is very large. The method is difficult to directly measure on line in real time and is more difficult to implement under the conditions of high temperature and high pressure.
In the hot wire (hot film) method, a thin metal wire (called a hot wire) heated by electricity is placed in a fluid, the heat dissipation amount of the hot wire in the gas flow is related to the flow velocity, and the heat dissipation amount causes the temperature change of the hot wire to cause the resistance change, so that a two-phase flow signal is converted into an electric signal. The capacitance method generally adopts non-intrusive measurement, and a common capacitance sensor mainly comprises two electrodes which are generally in a semicircular or spiral structure and are arranged on 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 difference of dielectric constants of the two-phase media, and the capacitance measured value can be used for reflecting the change of the two-phase flow parameters after being processed by the data acquisition system. The measuring principle of the conductance probe method is similar to that of a capacitance sensor, and the two-phase flow local parameters are identified by using the difference of the resistivities of two-phase media, but the conductance 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 are all used for electrifying or heating a test part, have higher requirements on the conductivity and the cleaning degree of the fluid, and are easily interfered by other equipment in practical use. It is difficult to achieve sufficient accuracy and stability under high temperature and high pressure test conditions.
The fiber-optic probe method is also a method for carrying out interventional measurement on two-phase fluid in the form of a probe. The measurement principle of the optical fiber probe is that the optical total reflection phenomenon is utilized to identify gas phase and liquid phase, and the optical fiber probe can be distinguished whether in gas phase or liquid phase by detecting electric signals with different heights generated by the intensity change of light intensity reflected to the receiving end by the optical fiber probe. The optical fiber probe method has outstanding advantages in measuring local parameters of two-phase flow, and the optical signal has stronger anti-interference capability than an electrical signal and has higher stability in signal transmission; the response speed and the acquisition frequency of the optical fiber probe are high and can reach several MHz; the optical fiber probe has higher sensitivity, corrosion resistance, lower requirements on fluid physical properties and higher measurement accuracy, thereby having wide application range.
In the vapor-liquid two-phase flow of industrial equipment, high temperature and high pressure are inevitable conditions, which not only have high requirements on the tolerance of the material of the test element, but also present great challenges for the selection of the measuring mode and the installation and sealing of the test element. In addition, the test pipelines of a plurality of devices are complex, such as a rod bundle channel, an annular channel and a narrow slit channel, which also requires that the test means of the local parameters of the two-phase flow is more flexible 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 method thereof.
The purpose of the invention is realized by the following technical scheme:
an optical fiber probe for measuring local parameters of high-temperature and 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 the test connection of the optical fiber probe body on a pipeline and the sealing under 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 used for covering the front part of the transmission optical fiber 2 and supporting and protecting the optical fiber, a second layer of stainless steel sleeve 5 which is used for covering 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 is filled in a gap between the transmission optical fiber 2 and the first layer of stainless steel sleeve 3 to serve as a first layer of sealing structure 4, and high-temperature adhesive glue is filled in a gap between the first layer of stainless steel sleeve 3 and the second layer of stainless steel sleeve 5 to serve as; the optical fiber probe tail connecting structure comprises a connector main body 7, a rear cover shell 9, an optical fiber protective sleeve 10 and an extrusion sleeve 8, wherein the connector main body 7, the rear cover shell 9 and the optical fiber protective sleeve 10 are sequentially connected; the rear end of the transmission optical fiber 2 penetrates into the extrusion sleeve 8, and the second layer 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 guide pipe 14 into which a test end of an optical fiber probe body extends, and a first sealing clamp sleeve 13 sleeved on the stainless steel guide pipe 14 and connected with the welding connecting piece 12 to form a stainless steel guide pipe sealing point I18;
the optical fiber probe tail sealing structure comprises an optical fiber probe body testing end and a reducing two-way joint 15, wherein the end part of a stainless steel guide pipe 14 extends into the reducing two-way joint, a second sealing clamping sleeve 16 is sleeved at one end of the reducing two-way joint 15 and connected with the reducing two-way joint 15 to form a stainless steel guide pipe sealing point II 19, and a third sealing clamping sleeve 17 is sleeved at the other end of the reducing two-way joint 15 and connected with the reducing two-way joint 15 to form an optical fiber probe body sealing point 20.
The stainless steel guide pipe 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 both made of quartz optical fibers, the two are integrated, the diameter of the two is 100-200 mu m, one end of the optical fiber is made into a conical shape by 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 materials and is processed into a cone with the cone angle and the diameter, the transmission fiber is a quartz fiber, and the sapphire probe tip and the quartz transmission 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 1-3 mm.
The outer diameter of the stainless steel conduit 14 is 3-6mm, and the specific size is determined by the outer diameter of the second layer stainless steel sleeve 5.
The optical fiber probe for measuring the local parameters of the high-temperature and high-pressure two-phase flow and the connecting method of the sealing structure thereof comprise the following steps:
(1) selecting a first layer of stainless steel sleeve 3 according to the condition of a test position, and inserting a processed transmission optical fiber 2 with a probe tip 1 into the first layer of stainless steel sleeve 3;
(2) injecting waterproof high-temperature adhesive glue into a gap between the transmission optical fiber 2 and the first layer of stainless steel sleeve 3 by using a micro injector, and curing the adhesive glue to form a first layer of sealing structure 4;
(3) determining the specification of a second layer of stainless steel sleeve 5, inserting the first layer of stainless steel sleeve 3 into the second layer of stainless steel sleeve 5, and injecting waterproof high-temperature adhesive glue into a gap between the first layer of stainless steel sleeve 3 and the second layer of stainless steel sleeve 5 by using a micro-injector to solidify the adhesive glue so as to complete a 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 connected in sequence, 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 only needs to use common adhesive;
(5) selecting a stainless steel conduit 14, a welding connector 12 and a reducing two-way connector 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) a hole is formed in the test pipeline 11, the welding connecting piece 12 is welded and connected with the first sealing cutting sleeve 13, and a first stainless steel guide pipe sealing point 18 is completed;
(7) inserting the optical fiber probe body into the reducing two-way joint 15, determining a sealing point 20 of the optical fiber probe body according to the measuring position and the length of the stainless steel conduit 14, and screwing to finish sealing;
(8) and connecting the other side of the two-way reducing connector 15 with the stainless steel guide pipe 14 to complete a second stainless steel guide pipe sealing point 19, so as to complete the sealing of all the structures.
Compared with the prior art, the invention has the following innovation points:
(1) the optical fiber probe capable of measuring the local parameters of the vapor-liquid two-phase flow is provided, the maximum diameter of the probe tip of the optical fiber probe is 100-200 mu m, the outer diameter of a pressure-bearing stainless steel pipe is 0.5-1mm, and the interference to fluid in the test process is reduced as much as possible;
(2) the nested structure of the double-layer stainless steel tube effectively ensures the pressure bearing and sealing of the probe test part, the length of the stainless steel tube can be freely adjusted, and the test position is more flexible to select;
(3) the sealing structure of the reducing two-way ferrule joint can realize the sealing of the optical fiber probe body and the test pipe section under the conditions of high temperature and high pressure.
The embodiment of the invention optimizes the optical fiber probe aiming at the problem of measuring the local parameters of the high-temperature and high-pressure vapor-liquid two-phase flow. By adopting the optical fiber probe, the measurement of local parameters in a 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 and high-pressure vapor-liquid two-phase flow.
Drawings
FIG. 1 is a schematic structural diagram of an optical fiber probe according to an embodiment of the present invention;
FIG. 2 is a schematic view of a connection structure of an optical fiber probe applied to a high-temperature and high-pressure testing pipeline according to an embodiment of the present invention;
fig. 3 is a schematic view of a ferrule sealing structure provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an optical fiber probe for measuring local parameters of high-temperature and high-pressure two-phase flow and a sealing structure thereof, and fig. 1 is a schematic structural diagram of an optical fiber probe body and is used for describing connection and sealing of the optical fiber probe body. The optical fiber connector mainly comprises a probe tip 1, a transmission optical fiber 2, a first layer of stainless steel sleeve 3, a first layer of sealing structure 4 between the first layer of stainless steel sleeve 3 and the transmission optical fiber 2, a second layer of stainless steel sleeve 5, a second layer of sealing structure 6 between the second layer of stainless steel sleeve 5 and the first layer of stainless steel sleeve 3, a connector main body 7, an extrusion sleeve 8, a rear housing 9 and an optical fiber protective sleeve 10.
Optionally, the probe tip 1 and the transmission fiber 2 are both quartz fibers, the two are integrated, the diameter of the two is 100-200 μm, one end of the fiber is made into a conical shape by a grinding method or a melt-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 cone with the cone angle and the diameter; the transmission optical fiber 2 is a quartz optical fiber, and the sapphire probe tip and the quartz transmission optical fiber are connected together through high-temperature adhesive glue;
either of the above two probe tip forms is optional.
The transmission optical fiber 2 passes through the 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 guide pipe is long, 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 glue 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 a double insurance for bearing the pressure of the optical fiber probe.
The transmission optical fiber 2 sequentially passes through the connector main body 7, the extrusion sleeve 8, the rear housing 9 and the optical fiber protective sleeve 10 to reach the signal processing part, and the second layer of stainless steel sleeve 5 is inserted into the groove of the connector main body 7 and fixed by using adhesive glue.
The above is the connection and sealing structure of the optical fiber probe body.
Fig. 2 is a schematic view of a connection structure of the optical fiber probe applied to a high-temperature and high-pressure test pipeline according to an embodiment of the present invention, and is used to describe a connection structure between an optical fiber probe body and a test pipeline and a sealing manner thereof. The connection structure of the optical fiber probe and the test pipeline comprises a test pipeline 11, a welding connector 12, a first sealing clamp sleeve 13 and a stainless steel guide pipe 14, and the tail sealing structure of the optical fiber probe comprises a reducing two-way connector 15, a second sealing clamp sleeve 16 and a third sealing clamp sleeve 17.
The optical fiber probe method is an intrusive measurement, a hole needs to be formed in 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 in a clamping sleeve sealing structure.
The stainless steel conduit 14 is used for connecting the welding connecting piece 12 with the reducing two-way joint 15, the stainless steel conduit can protect the optical fiber probe body on one hand, and the length of the stainless steel conduit can be freely changed on the other hand, so that the flexible adjustment of a measuring position is realized.
The optical fiber probe body is inserted into the reducing two-way joint 15 and the stainless steel guide pipe 14 in sequence, and the reducing 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 diagram of the ferrule sealing structure shown in fig. 2, which mainly includes a welding connector 12, a first sealing ferrule 13, a stainless steel conduit 14, a two-way reducer connector 15, a first stainless steel conduit sealing point 18, a second stainless steel conduit sealing point 19, and a fiber probe body sealing point 20.
The first stainless steel conduit sealing point 18 and the second stainless steel conduit sealing point 19 are located on two sides of the stainless steel conduit 14, two ends of the stainless steel conduit 14 abut against steps in the welding connecting piece 12, and the length of the stainless steel conduit can be determined according to the selection of the length of the probe body and 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 protective layer integrally penetrates through the reducing two-way joint 15 and the stainless steel conduit 14 to reach the test position of the probe tip of the optical fiber probe.
The optical fiber probe for measuring local parameters of high-temperature and high-pressure two-phase flow and the sealing structure thereof in the invention take the measurement of the local parameters of the center of a certain high-temperature and high-pressure circular tube channel as an example, and the specific operation and installation steps are as follows:
(1) selecting a first layer of stainless steel sleeve 3 according to the condition of a test position, wherein the stainless steel sleeve with the outer diameter of 1mm and the inner diameter of 0.5mm is selected in the embodiment; inserting the processed quartz transmission optical fiber 1 with the probe tip 2 into the first layer of stainless steel sleeve 3, wherein the probe tip 1 penetrates out about 2 mm;
(2) injecting waterproof high-temperature adhesive into the gap between the quartz transmission optical fiber 2 and the first layer of stainless steel sleeve 3 by using a micro injector, and slowly curing to complete the first layer of sealing structure 4;
(3) determining the specification of the 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 in the embodiment, inserting the first layer of stainless steel sleeve 3 into the second layer of stainless steel sleeve 5, and penetrating a probe tip 1 by about 20 mm; injecting 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 by using a micro-injector, and slowly curing 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 connected in sequence, 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 only needs to use common adhesive;
(5) selecting a stainless steel guide pipe 14 with the diameter of 6mm, a welding connecting piece 12 with the diameter of 6mm and a reducing two-way joint 15 with the diameter of 6mm rotating by 3mm, determining the length of the stainless steel guide pipe according to a 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 guide pipe 14;
(6) a 6mm hole is formed in the test pipeline 11, the welding connecting piece 12 is welded, and the first sealing cutting sleeve 13 is connected to complete the first stainless steel guide pipe sealing point 18;
(7) inserting the optical fiber probe body into the reducing two-way joint 15, determining a sealing point 20 of the optical fiber probe body according to the measuring position and the length of the stainless steel conduit 14, and screwing to finish sealing;
(8) and connecting the 6mm side of the reducing two-way joint 15 with the stainless steel guide pipe 14 to finish the second stainless steel guide pipe sealing point 19, so as to finish the sealing of all the structures.
The optical fiber probe for measuring local parameters of high-temperature and high-pressure two-phase flow and the sealing structure thereof provided by the embodiment of the invention mainly comprise a structure and a connection process.
The embodiment of the invention optimizes the optical fiber probe method, expands the test conditions of the optical fiber probe method and solves the problem of measuring local parameters of high-temperature and high-pressure vapor-liquid two-phase flow.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An optical fiber probe for measuring local parameters of high-temperature and high-pressure two-phase flow and a 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 and test pipeline connecting structure and the optical fiber probe tail sealing structure are used for realizing the test connection of the optical fiber probe body on a pipeline and the sealing under high-temperature and high-pressure conditions;
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) covering the front part of the transmission optical fiber (2) and supporting and protecting the optical fiber, a second layer of stainless steel sleeve (5) covering 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 is filled in a gap between the transmission optical fiber (2) and the first layer of stainless steel sleeve (3) to serve as a first layer of sealing structure (4), and high-temperature adhesive glue is filled in a gap between the first layer of stainless steel sleeve (3) and the second layer of stainless steel sleeve (5) to serve as a second layer of sealing structure (6; the optical fiber probe tail connecting structure comprises a connector main body (7), a rear cover shell (9) and an optical fiber protective sleeve (10) which are sequentially connected, and an extrusion sleeve (8) positioned at the center of the connector main body (7), the rear cover shell (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 connection structure of the optical fiber probe and the test pipeline comprises a test pipeline (11), a welding connector (12) fixed on an opening of the test pipeline (11), a stainless steel guide pipe (14) into which the test end of the optical fiber probe body extends, and a first sealing clamp sleeve (13) sleeved on the stainless steel guide pipe (14) and connected with the welding connector (12) to form a stainless steel guide pipe sealing point I (18);
the optical fiber probe tail sealing structure comprises an optical fiber probe body testing end and a reducing two-way joint (15) extending into the end of a stainless steel guide pipe (14), a second sealing clamping sleeve (16) connected with the reducing two-way joint (15) at one end of the reducing two-way joint (15) to form a stainless steel guide pipe sealing point two (19) is sleeved, and a third sealing clamping sleeve (17) connected with the reducing two-way joint (15) at the other end of the reducing two-way joint (15) to form an optical fiber probe body sealing point (20) is sleeved.
2. The optical fiber probe and the sealing structure thereof for high-temperature and high-pressure two-phase flow local parameter measurement according to claim 1, wherein the stainless steel conduit (14) can freely change the length thereof, thereby realizing flexible adjustment of the measurement position.
3. The optical fiber probe and the sealing structure thereof for the local parameter measurement of the high-temperature and high-pressure two-phase flow according to claim 1, wherein the probe tip (1) and the transmission optical fiber (2) are both made of quartz optical fibers, the probe tip and the transmission optical fiber are integrated into a whole, the diameter of the quartz optical fiber is 100-200 μm, one end of the quartz optical fiber is made into a conical shape by a grinding method or a melt-drawing method, and the cone angle is 30-90 degrees; or the probe tip (1) is made of sapphire materials and is processed into a cone 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.
4. The optical fiber probe and the sealing structure thereof for the local parameter measurement of the high-temperature and high-pressure two-phase flow according to claim 1, wherein the outer diameter of the first layer of the stainless steel sleeve (3) is 0.5-1mm, and the outer diameter of the second layer of the stainless steel sleeve (5) is 1-3 mm.
5. The optical fiber probe and the sealing structure thereof for the local parameter measurement of the high-temperature and high-pressure two-phase flow according to claim 1, wherein the outer diameter of the stainless steel conduit (14) is 3-6mm, and the specific size depends on the outer diameter of the second layer stainless steel sleeve (5).
6. The method for connecting the optical fiber probe and the sealing structure thereof for the local parameter measurement of the high-temperature high-pressure two-phase flow according to any one of claims 1 to 5, is characterized by comprising the following steps:
(1) selecting a first layer of stainless steel sleeve (3) according to the condition of a test position, and inserting a processed transmission optical fiber (2) with a probe tip (1) into the first layer of stainless steel sleeve (3);
(2) injecting waterproof high-temperature adhesive glue into a gap between the transmission optical fiber (2) and the first layer of stainless steel sleeve (3) by using a micro injector, and curing the adhesive glue to form a first layer of sealing structure (4);
(3) determining the specification of a second layer of stainless steel sleeve (5), inserting the first layer of stainless steel sleeve (3) into the second layer of stainless steel sleeve (5), and injecting waterproof high-temperature adhesive glue into a gap between the first layer of stainless steel sleeve (3) and the second layer of stainless steel sleeve (5) by using a micro-injector to solidify the adhesive glue so as to complete a second layer of 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 a 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 only needs to use common adhesive;
(5) selecting a stainless steel guide pipe (14), a welding connecting piece (12) and a reducing two-way joint (15), determining the length of the stainless steel guide pipe 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 guide pipe (14);
(6) a hole is formed in the test pipeline (11), the welding connecting piece (12) is welded and connected with the first sealing cutting sleeve (13), and a first stainless steel guide pipe sealing point I (18) is completed;
(7) inserting the optical fiber probe body into the reducing two-way joint (15), determining a sealing point (20) of the optical fiber probe body according to the measuring position and the length of the stainless steel conduit (14), and screwing to finish the sealing;
(8) and connecting the other side of the reducing two-way joint (15) with the stainless steel guide pipe (14) to finish a second stainless steel guide pipe sealing point (19), thereby finishing the sealing of all structures.
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| CN111879347A (en) * | 2020-07-15 | 2020-11-03 | 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 |
| CN112649039A (en) * | 2020-11-06 | 2021-04-13 | 重庆大学 | Multi-probe conductance probe for high-temperature and high-pressure two-phase flow detection and manufacturing method thereof |
| CN114777585A (en) * | 2022-03-22 | 2022-07-22 | 中国工程物理研究院流体物理研究所 | Fixing device and method for measuring action time of detonator |
| US11585698B2 (en) * | 2019-09-16 | 2023-02-21 | Photon Control Inc. | Fiber optic temperature probe |
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