CN110211715B - Pipeline fluid thermal stratification monitoring device - Google Patents
Pipeline fluid thermal stratification monitoring device Download PDFInfo
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- CN110211715B CN110211715B CN201910443919.0A CN201910443919A CN110211715B CN 110211715 B CN110211715 B CN 110211715B CN 201910443919 A CN201910443919 A CN 201910443919A CN 110211715 B CN110211715 B CN 110211715B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a pipeline fluid thermal stratification monitoring device, which comprises an integrated thermocouple, a guide tube and a surrounding belt, wherein the integrated thermocouple is arranged in the surrounding belt; the integrated thermocouple sequentially comprises a connecting piece, an extension cable, a glue pouring pipe assembly and an armored thermocouple; the surrounding belt comprises a connecting seat for fixing the lower end of the guide pipe and a flexible belt for surrounding the outer side of the pipeline, and the armored thermocouple penetrates through the guide pipe, penetrates out of the lower end of the guide pipe and is fixed on the flexible belt. The pipeline fluid thermal stratification monitoring device is reasonable in structural design, the integrated thermocouple, the metal guide tube and the encircling band are combined to form an organic whole, the on-site installation and disassembly are convenient, the measurement of the radial fluid temperature gradient of the pipeline can be realized, and the accuracy, precision and dynamic response of temperature measurement are ensured; the integrated thermocouple is led out through a plurality of pairs of thermocouple extension cables, and the convenience and the reliability of connection between the integrated thermocouple and the compensation cable are guaranteed by adopting a connecting piece mode.
Description
Technical Field
The invention belongs to the technical field of thermal fatigue monitoring of pipelines of nuclear power plants, and particularly relates to a pipeline fluid thermal stratification monitoring device.
Background
Thermal stratification (Thermal stratification) refers to the phenomenon in which a hotter, lighter medium flows over a cooler, heavier medium, forming a temperature gradient during the flow of the medium. Thermal delamination causes bending stress to be generated in the axial direction of the pipe due to uneven expansion, and long-term bending stress circulation finally causes thermal fatigue phenomena such as pipe cracks.
At present, a series of events related to thermal fatigue of reactor coolant pipelines occur in pressurized water reactor nuclear power plants worldwide, and research results of the American institute of Electrical Power science (EPRI) show that the occurrence probability of the event that the pipelines are cracked and failed due to thermal fatigue caused by thermal stratification tends to rise, so that the monitoring of the thermal stratification of the pipelines has important significance for ensuring the safe operation of the nuclear power plants. In order to deal with the pipeline thermal fatigue phenomenon, effective measures are needed to monitor the sensitive position which is likely to generate thermal stratification, the temperature gradient change value is collected, and data support and technical basis are provided for the thermal fatigue damage assessment and the relieving measure formulation. The feasible monitoring method for the fluid thermal stratification is to measure the radial temperature distribution of the outer side of the pipeline and convert the temperature of the inner wall and the fluid so as to monitor the running state of the pipeline.
In the prior art, the outer wall of the pipeline is usually measured in an indirect mode, and a medium (such as a steel belt) is generally separated between a sensor and the surface of the pipeline, but the mode has more defects: (1) the outer wall of the pipeline is irregular and round, and after the steel belt encircles the pipeline, a gap possibly exists between the steel belt and the pipeline, so that the temperature measurement is inaccurate; (2) the temperature sensor measures the surface of the pipeline through the steel strip, so that heat transfer is delayed, and the overall dynamic response of the device is seriously influenced; (3) in the rapid temperature change process, the steel strip can form a filtering effect, so that the temperature sensor device cannot capture the temperature change; (4) the traditional technology usually adopts the mode of adding a bracket to a single finished thermocouple, so that the number of thermocouples is large, the material consumption of cable joints, cables and the like required to be manufactured is greatly increased, and the field construction workload is increased.
Disclosure of Invention
In view of this, in order to overcome the defects in the prior art, an object of the present invention is to provide a pipeline fluid thermal stratification monitoring apparatus, which is capable of measuring a temperature gradient of a pipeline radial fluid, and ensuring accuracy, precision and dynamic response of temperature measurement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pipeline fluid thermal stratification monitoring device comprises an integrated thermocouple, a guide tube and a surrounding belt; the integrated thermocouple sequentially comprises a connecting piece, an extension cable, a glue pouring pipe assembly and an armored thermocouple; the surrounding belt comprises a connecting seat for fixing the lower end of the guide pipe and a flexible belt for surrounding the outer side of the pipeline, and the armored thermocouple penetrates through the guide pipe, penetrates out of the lower end of the guide pipe and is fixed on the flexible belt.
Preferably, the connecting piece comprises a shell, an insulating block, a thermocouple needle core and a locking reed for locking, wherein the insulating block, the thermocouple needle core and the locking reed are arranged in the shell; the thermocouple needle core comprises a contact pin and a jack, and a first through hole and a second through hole which are respectively matched with the contact pin and the jack are formed in the insulating block.
More preferably, the connecting piece is including mutually supporting public head and female head of pegging graft, public head in proper order include public first casing, first collapsible ring, first insulating block, thermocouple needle core and with public first fitting piece of first casing matched with, female head in proper order include female first casing, the collapsible ring of second, second insulating block, thermocouple needle core and with female first fitting piece of first casing matched with, the locking reed sets up public first fitting piece is last, but public first fitting piece partial cooperation is inserted in the female first fitting piece.
Preferably, the extension cable comprises a thermocouple wire, an insulating layer wrapped outside the thermocouple wire, a shielding layer wrapped outside the insulating layer, and a sheath wrapped outside the shielding layer.
Preferably, the glue pouring pipe assembly comprises a cable locking device and a metal glue pouring pipe; the cable locking device comprises a bolt column with an axial through hole, a threaded cap and a third retractable ring matched with the threaded cap, wherein the upper part of the metal rubber pouring tube is provided with an internal thread matched with the bolt column, and the lower part of the metal rubber pouring tube is filled with insulating rubber.
More preferably, the glue filling pipe assembly further comprises an elastic columnar support arranged at the lower part of the metal glue filling pipe, and a through hole for the armored thermocouple to penetrate through is formed in the elastic columnar support.
Further preferably, the guide tube comprises a metal guide tube, a locking screw and a heat-insulating sleeve positioned above the metal guide tube, wherein the heat-insulating sleeve is matched with the elastic column-type bracket.
Preferably, the encircling band further comprises a fixing block for fixedly mounting the armored thermocouple on the surface of the encircling band, an adjustable connecting buckle for fixing the encircling band outside the pipeline and performing tightness adjustment, and a rectangular through hole for the armored thermocouple to pass through, wherein the end of the armored thermocouple passes through the rectangular through hole and is tightly attached to the outer side wall of the pipeline.
More preferably, the rectangular through holes are distributed in different radial and axial directions of the encircling band, and correspond to different positions of the pipeline when the encircling band is encircled outside the pipeline.
Further preferably, when the loop is wound around the outside of the pipe, the corresponding central angle between adjacent rectangular through holes is 20 ° to 60 °.
Compared with the prior art, the invention has the advantages that: the pipeline fluid thermal stratification monitoring device is reasonable in structural design, the integrated thermocouple, the metal guide tube and the encircling band are combined to form an organic whole, the on-site installation and disassembly are convenient, the measurement of the radial fluid temperature gradient of the pipeline can be realized, and the accuracy, precision and dynamic response of temperature measurement are ensured; the integrated thermocouple is led out through one or more pairs of thermocouple extension cables, the convenience and the reliability of connection between the integrated thermocouple and the compensation cable are guaranteed by adopting a connecting piece, and meanwhile, the use amount of the compensation cable and the workload of laying the cable on site are greatly reduced; finally, the invention can realize the long-term monitoring of the fluid thermal stratification of the primary circuit auxiliary pipeline in the high-irradiation environment of the nuclear power plant.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an exploded view of a pipeline fluid thermal stratification monitoring device in a preferred embodiment of the present invention;
FIG. 2 is an enlarged view of the male and female portions of FIG. 1;
FIG. 3 is an enlarged view of the extension cable and glue tube assembly of FIG. 1;
FIG. 4 is a front view of the insulator in the connector of the preferred embodiment of the present invention;
FIG. 5 is a front view of a pipeline fluid thermal stratification monitoring device according to a preferred embodiment of the present invention;
FIG. 6 is a front view of an integrated thermocouple in a piping fluid thermal stratification monitoring device in accordance with a preferred embodiment of the present invention;
FIG. 7 is a front view of a guide tube in a device for thermal stratification of a pipeline fluid according to a preferred embodiment of the present invention;
FIG. 8 is a front view of a wrap around band in a pipeline fluid thermal stratification monitoring device according to a preferred embodiment of the present invention;
FIG. 9 is an expanded view of a first perspective of a wrap around band in a pipeline fluid thermal stratification monitoring device according to a preferred embodiment of the present invention;
FIG. 10 is an expanded view of a second perspective of the encircling band in the apparatus for thermal stratification monitoring of ducted fluids according to the preferred embodiment of the present invention;
wherein: the thermocouple comprises an integrated thermocouple-A, a connecting piece-1, a male head-11, a female head-12, a male head shell-131, a female head shell-132, a first sealing ring-141, a second sealing ring-142, an insulating block-15, a first insulating block-151, a second insulating block-152, a pin-161, a jack-162, a locking reed-17, a first retractable ring-181, a second retractable ring-182, a first through hole-191, a second through hole-192, a male head fitting-1001 and a female head fitting-1002; an extension cable-2, a thermocouple wire-21, an insulating layer-22, a shielding layer-23 and a sheath-24; a glue pouring pipe component-3, a cable locking device-31, a bolt column-311, a limiting piece-312, an external thread-313, a third retractable ring-314, a thread cap-315, a metal glue pouring pipe-32, an internal thread-321, an insulating glue-322, an elastic column type bracket-33 and a through hole-331; armored thermocouple-4; a metal guide tube-B, a heat insulation sleeve-5, a metal conduit-6, a heat dissipation hole-61, an oval opening-62 and a locking screw-7; the connecting device comprises a surrounding belt-C, a connecting seat-8, a metal belt-9, a rectangular through hole-91, a fixing block-10, an adjustable connecting buckle-1X, a connecting block-1X 1, a connecting screw-1X 2 and a connecting nut-1X 3.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment fluid thermal stratification monitoring device for pipeline
Referring to fig. 1-10, the thermal stratification monitoring device for pipeline fluid of the present embodiment mainly includes three parts, i.e., an integrated thermocouple a, a guide tube B, and a surrounding band C, which is an annular flexible metal band 9 for surrounding the outer wall of the pipeline.
The integrated thermocouple A, the guide tube B and the surrounding belt C are combined together to form an organic whole, so that the integrated thermocouple A, the guide tube B and the surrounding belt C are convenient to install on a loop pipeline of a nuclear power plant quickly on the one hand, and the use amount of a compensation cable and the laying workload are greatly reduced on the other hand.
1. Integrated thermocouple A
The integrated thermocouple A sequentially comprises a connecting piece 1, an extension cable 2, a glue pouring pipe assembly 3 and an armored thermocouple 4.
(1) Connecting piece
The connecting piece 1 is an aviation plug. The connector 1 comprises a housing and an insulating block 15, a thermocouple needle core and a locking reed 17 for locking which are arranged in the housing. The shell is made of stainless steel.
The thermocouple needle core comprises a contact pin 161 and a jack 162, wherein each type is 7 pairs, the number of the pairs is 1, the material can be selected according to the thermocouple graduation number, the thermocouple needle core is respectively arranged in the insulating blocks 15 of the male head 11 and the female head 12, and the thermocouple needle core is connected with the core wire of the extension cable 2, namely the thermocouple wire 21 in a welding mode. The insulating block 15 is made of PEEK (polyether ether ketone), is cylindrical, and is internally provided with 7 pairs of through holes in a honeycomb-shaped corresponding arrangement, each pair of through holes comprises a first through hole 191 and a second through hole 192 with the size of 1, which are respectively matched with the contact pin 161 and the jack 162, and are used for installing a thermocouple needle core, as shown in fig. 4.
Specifically, in this embodiment, the connecting member 1 includes the male connector 11 and the female connector 12 that cooperate with each other to be plugged, the male connector 11 includes the male connector housing 131, the first sealing ring 141, the first shrinkable ring 181, the first insulating block 151, the thermocouple needle core and the male connector fitting 1001 that cooperates with the male connector housing 131 in proper order, the female connector 12 includes the female connector housing 132 in proper order, the second sealing ring 142, the second shrinkable ring 182, the second insulating block 152, the thermocouple needle core and the female connector fitting 1002 that cooperates with the female connector housing 132, the locking reed 17 is disposed on the male connector fitting 1001, and the male connector fitting 1001 can be partially fitted and inserted into the female connector fitting 1002. That is, the thermocouple stylet in the male head 11 is one of the pin 161 or the socket 162, and the thermocouple stylet in the female head 12 is the remaining one of the pin 161 or the socket 162. In this embodiment, the thermocouple needle core in the male head 11 is a pin 161, and the thermocouple needle core in the female head 12 is a socket 162. The male housing 131 and the male fitting 1001 and the female housing 132 and the female fitting 1002 are connected by internal and external threads.
The shell of the connector 1 is composed of a male shell 131 and a female shell 132, and the shape of the shell is cylindrical, so that the functions of fixing the extension cable 2, accommodating parts and forming physical protection are achieved. The sealing ring is made of silicon rubber and is positioned on the inner side of the wire inlet of the extension cable and the joint of the male head 11 and the female head 12, and a good waterproof sealing effect can be achieved.
The locking reed 17 is positioned on one side of the male head 11, and after the male head 11 is combined with the female head 12, the male head and the female head of the connecting piece 1 are locked through the locking reed 17. The thermocouple aviation connecting piece 1 designed by the method has good radiation resistance, high temperature resistance and waterproof performance.
(2) The extension cable 2 is an irradiation-resistant compensation cable, and comprises a thermocouple wire 21, an insulating layer 22 wrapped outside the thermocouple wire 21, a shielding layer 23 wrapped outside the insulating layer 22, and a sheath 24 wrapped outside the shielding layer 23.
Wherein the materials of each part are as follows: the insulating layer 22 is PEEK, the jacket 24 is silicone rubber, and the rest is polyester, for example, wrapped.
In other embodiments, the materials of the various components are: the insulating layer 22 is cross-linked polyethylene-cross-linked polyolefin, the jacket 24 is polyolefin, and the rest is polyester, for example, wrapping.
(3) The glue pouring pipe component 3 comprises a cable locking device 31, a metal glue pouring pipe 32 and an elastic column-shaped bracket 33 arranged at the lower part of the metal glue pouring pipe 32.
The cable locking device 31 is made of stainless steel and comprises a bolt column 311 with an axial through hole, a threaded cap 315 and a third retractable ring 314 matched with the threaded cap 315, a through hole 331 for the armored thermocouple 4 to penetrate through is formed in the elastic column-shaped support 33, an internal thread 321 matched with the bolt column 311 is formed in the upper portion of the metal rubber pouring tube 32, and insulating rubber 322 is filled in the lower portion of the metal rubber pouring tube 32.
The bolt column 311 is provided with an internal thread 321 matched with the metal potting tube 32 and an external thread 313 matched with the thread cap 315, so that the bolt column 311 can be screwed into the metal potting tube 32 for fixation, the bolt column 311 is further provided with a limiting part 312 of a hexagonal structure for facilitating the clamping of a wrench for screwing or unscrewing, and the limiting part 312 is similar to a hexagon nut. The dome-shaped threaded cap 315 with the sealing ring is also provided with an internal thread 321 matched with the external thread 313 of the bolt column 311, the threaded cap 315 can be used for passing through a cable, and the threaded cap 315 is matched with the third retractable ring 314, so that the cable can be clamped and extended by the cable 2, and the cable can be locked and sealed.
The metal rubber filling pipe 32 is a hollow cylindrical structural member made of stainless steel and having a thick upper part and a thin lower part, the upper part of the metal rubber filling pipe is provided with the extension cable 2, the metal rubber filling pipe is matched with the cable locking device 31 through an internal thread 321, and the lower part of the metal rubber filling pipe is provided with an elastic cylindrical support 33.
Seven through holes 331 are formed in the middle of the elastic column type support 33 in a honeycomb shape and used for penetrating through the armored thermocouple 4, the thermocouple wire 21 in the radiation-resistant compensation cable and the thermocouple wire 21 in the armored thermocouple 4 are welded inside the metal rubber filling pipe 32 and isolated and insulated by a heat-shrinkable sleeve, and after the welding is finished, the insulating rubber 322 is filled in the rubber filling pipe to form a cured rubber body, so that the fixation and insulation of the thermocouple wire 21 are realized.
The armored thermocouple 4 in the embodiment comprises seven armored thermocouples 4 with different lengths, an armored thermocouple bundle is formed, the thermocouples are of 1 type precision grade and are used for being installed on the annular flexible metal belt 9 to achieve temperature measurement, tail core wires are in butt joint with thermocouple core wires, namely thermocouple wires 21, of the extension cable 2 in the rubber filling pipe to achieve signal leading-out, the thermocouple armor materials are made of INCONEL600 materials, magnesium oxide powder is filled inside the thermocouple armor materials, and N-type or K-type thermocouple materials can be used in a high-temperature and high-radiation environment for a long time.
The measuring part at the front end of the integrated thermocouple A is clockwise fixed on the semicircle of the flexible annular metal belt 9, the central angle between the end parts of two adjacent thermocouples is 30 degrees, and the measurement of the temperature gradient of the fluid in the radial direction of the pipeline can be realized; the end part of the armored thermocouple 4 penetrates through the rectangular through hole 91 on the flexible annular metal belt 9 and is directly contacted with the pipeline wall, so that the defects of dynamic response lag and generation of filtering effect caused by traditional measurement of the temperature of the outer wall of the pipeline through the metal belt 9 are avoided; the connection with the extension cable 2 is realized in the glue pouring guide pipe in a mode of a thermocouple bundle formed by a plurality of thermocouples, and a thermocouple aviation connector, namely a connecting piece 1, is arranged at the end part of the extension cable 2, so that the integration of the assembly is realized, and the assembly is convenient to be butted with a laid compensation cable; the metal armor of the armored thermocouple 4, the shielding layer 23 of the extension cable 2, the metal shell of the glue pouring pipe assembly 3 and the shell of the thermocouple aviation connecting piece 1 are all grounded, and a good electromagnetic shielding function is guaranteed.
2. Guide tube B
The guide tube B comprises a metal guide tube 6, a locking screw 7 and a heat-insulating sleeve 5 positioned above the metal guide tube 6, wherein the heat-insulating sleeve 5 is matched with the elastic column-shaped bracket 33. The metal conduit 6 is also provided with a heat dissipation hole 61.
Wherein, the heat insulation sleeve 5 is made of PEEK material and has the performances of radiation resistance, high temperature resistance and heat insulation; the metal conduit 6 is a hollow stainless steel pipe for protecting and leading out the armored thermocouple 4, the outer wall of the upper part of the stainless steel pipe is provided with a heat radiation hole 61 for radiating heat and reducing the conduction of hot air to the metal rubber filling pipe 32 through the pipe, and the pipe wall of the lower end is provided with an oval opening 62 for transmitting out the armored thermocouple 4. The locking screw 7 is made of stainless steel and is used for connecting and locking the metal guide pipe and the connecting seat 8 on the flexible annular metal belt 9 and the metal guide pipe and the metal irrigation pipe 32.
The metal guide tube B is adopted, the armored thermocouple 4 penetrates out of the guide tube B and is directly introduced into the heat insulation layer of the pipeline, powerful physical protection is formed on the armored thermocouple 4, and the influence on heat insulation is reduced; the end part of the metal guide pipe B is provided with a heat insulation sleeve 5 for separating the contact between the guide pipe and the metal of the glue filling pipe and reducing the heat transferred to the metal glue filling pipe 32 by the pipeline, and meanwhile, the circumference of the end part of the guide pipe is provided with 3 heat dissipation holes 61 for heat dissipation in 120 degrees, so that the influence of the heat on the thermal aging of polymer materials such as the insulating glue 322, the insulating layer 22 of the extension cable 2, the sheath 24 and the like is reduced as much as possible; the metal guide tube B is fixed with the connecting seat 8 on the flexible annular metal belt 9 and the metal rubber pouring tube 32 in a screw locking mode without adopting threaded connection, so that the problem that the leading-out port of the armored thermocouple 4 cannot correspond to the leading-out port on the connecting seat 8 is solved.
3. Encircling belt C
The encircling band C comprises a connecting seat 8 for fixing the lower end of the guide pipe B, a flexible band, namely a metal band 9, for encircling the pipeline, a fixing block 10 for fixedly installing the armored thermocouple 4 on the surface of the encircling band C, an adjustable connecting buckle 1X for fixing the encircling band C on the outer side of the pipeline and adjusting the tightness of the encircling band C, and a rectangular through hole 91 for the armored thermocouple 4 to pass through, wherein the armored thermocouple 4 passes through the guide pipe B and penetrates out of the lower end of the guide pipe B to be fixed on the flexible band, and the end part of the armored thermocouple 4 passes through the rectangular through hole 91 and is tightly attached to the outer side wall of the pipeline.
The connecting seat 8 is welded on the outer surface of the metal belt 9 and is used for fixing the function of the metal guide tube B. The adjustable connecting buckle 1X consists of a connecting block 1X1 welded on the metal belt 9 and provided with a threaded hole, a connecting screw rod 1X2 and a connecting nut 1X3 which are matched with each other, and is used for fixing and tightness adjustment of the metal belt 9 after encircling on a pipeline.
The rectangular through holes 91 are distributed in different radial and axial directions of the surrounding belt C, and when the surrounding belt C surrounds the outer side of the pipeline, the rectangular through holes 91 correspond to different positions of the pipeline. The armored thermocouple 4 penetrates through the rectangular through hole 91, and the end part of the armored thermocouple is pressed below the metal belt 9, so that direct contact type temperature measurement with the pipe wall is realized, and the defects of dynamic response lag and generation of a filtering effect caused by the fact that the temperature of the outer wall of the pipeline is measured through the metal belt 9 in the prior art are avoided. When the circumferential band C is wound around the outside of the pipe, the corresponding central angle between the adjacent rectangular through holes 91 is 20 to 60 °. In the embodiment, 7 rectangular through holes 91 are distributed on the surface of the metal strip 9 at an interval central angle of 30 degrees and are used for installing the end parts of the armored thermocouples 4, and the rectangular through holes 91 after installation are positioned on the same side of the pipeline so as to realize measurement of the temperature gradient of the fluid in the radial direction of the pipeline, as shown in fig. 8-10.
7 armored thermocouples 4 are regularly distributed on the surface of the flexible annular metal belt 9 and are firmly fixed on the flexible belt through fixing blocks 10, and the end parts of the thermocouples are inserted into the rectangular through holes 91 in the metal belt 9 to be in direct contact with the pipe wall, so that good dynamic response and precision in the temperature measurement process are guaranteed; the armored thermocouple 4 is led out from the metal guide tube B and a matching hole of the annular belt upper connecting seat 8, so that the uniformity and the specification of a thermocouple bundle are guaranteed; the tightness of the flexible annular metal belt 9 can be adjusted through the adjustable connecting buckle 1X, so that the metal belt 9 can be tightly attached to the outer wall of the pipeline; the material of the flexible annular metal belt 9 is the same as that of the pipeline, and the thermal expansion coefficients of the flexible annular metal belt and the pipeline are also consistent, so that the degree of attachment between the pipeline and the metal belt 9 in the process of expansion with heat and contraction with cold is ensured.
The monitoring device in the embodiment adopts materials which meet relevant use specifications of nuclear island equipment, can be applied to containment vessels of nuclear power plants, and has the characteristics of irradiation resistance, high temperature resistance, aging resistance and the like.
The pipeline fluid thermal stratification monitoring device can realize the measurement of the temperature gradient of the pipeline radial fluid; the end part of the armored thermocouple penetrates through the rectangular through hole on the flexible annular metal strip and is directly contacted with the wall of the pipeline, so that the defects of dynamic response lag and generation of a filtering effect caused by the fact that the temperature of the outer wall of the pipeline is measured through the metal strip in the prior art are avoided; the connection with the extension cable is realized in the glue-pouring guide pipe in a thermocouple bundle mode, and a thermocouple aviation connector is arranged at the end part of the extension cable, so that the integration of the assembly is realized, and the assembly is convenient to butt joint with the laid compensation cable; the metal armor of the armored thermocouple, the shielding layer of the extension cable, the metal shell of the glue pouring pipe assembly and the thermocouple aviation connecting piece shell are all grounded, and a good electromagnetic shielding function is guaranteed.
The pipeline fluid thermal stratification monitoring device is reasonable in structural design, and the integrated thermocouple, the metal guide tube and the encircling band are combined to form an organic whole, so that the device is convenient to install and disassemble on site; the end part of the thermocouple is directly contacted with the surface of the pipeline, so that the accuracy, precision and dynamic response of temperature measurement are ensured; the integrated thermocouple is led out through one or more pairs of thermocouple extension cables, the convenience and the reliability of connection between the integrated thermocouple and the compensation cable are guaranteed by adopting a connecting piece, and meanwhile, the use amount of the compensation cable and the workload of laying the cable on site are greatly reduced; finally, the invention can realize the long-term monitoring of the fluid thermal stratification of the primary circuit auxiliary pipeline in the high-irradiation environment of the nuclear power plant.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (3)
1. A pipeline fluid thermal stratification monitoring device, characterized in that: comprises an integrated thermocouple, a guide tube and a surrounding belt; the integrated thermocouple sequentially comprises a connecting piece, an extension cable, a glue pouring pipe assembly and an armored thermocouple; the surrounding belt comprises a connecting seat for fixing the lower end of the guide pipe and a flexible belt for surrounding the outer side of the pipeline, and the armored thermocouple passes through the guide pipe, penetrates out of the lower end of the guide pipe and is fixed on the flexible belt;
the encircling band further comprises a fixing block for fixedly mounting the armored thermocouple on the surface of the encircling band, an adjustable connecting buckle for fixing the encircling band outside the pipeline and performing tightness adjustment, and a rectangular through hole for the armored thermocouple to pass through, wherein the end part of the armored thermocouple passes through the rectangular through hole and is tightly attached to the outer side wall of the pipeline;
the glue pouring pipe assembly comprises a cable locking device and a metal glue pouring pipe; the cable locking device comprises a bolt column with an axial through hole, a threaded cap and a third retractable ring matched with the threaded cap, wherein the upper part of the metal rubber pouring tube is provided with an internal thread matched with the bolt column, and the lower part of the metal rubber pouring tube is filled with insulating rubber;
the glue pouring pipe assembly further comprises an elastic columnar support arranged at the lower part of the metal glue pouring pipe, and a through hole for the armored thermocouple to penetrate through is formed in the elastic columnar support;
the guide tube comprises a metal guide tube, a locking screw and a heat-insulating sleeve positioned above the metal guide tube, and the heat-insulating sleeve is matched with the elastic column-shaped bracket;
the metal conduit is provided with a heat dissipation hole, and the pipe wall at the lower end of the metal conduit is provided with a notch for leading out the armored thermocouple;
the connecting piece comprises a shell, an insulating block, a thermocouple needle core and a locking reed for locking, wherein the insulating block, the thermocouple needle core and the locking reed are arranged in the shell; the thermocouple needle core comprises a contact pin and an insertion hole, a first through hole and a second through hole which are respectively matched with the contact pin and the insertion hole are formed in the insulating block, and the diameters of the first through hole and the second through hole are different;
the connecting piece comprises a male head and a female head which are matched and spliced with each other, the male head sequentially comprises a male head shell, a first retractable ring, a first insulating block, a thermocouple needle core and a male head matching piece matched with the male head shell, the female head sequentially comprises a female head shell, a second retractable ring, a second insulating block, a thermocouple needle core and a female head matching piece matched with the female head shell, the locking reed is arranged on the male head matching piece, and the male head matching piece can be partially inserted into the female head matching piece in a matched manner;
the rectangular through holes are distributed in different radial directions and different axial directions of the surrounding belt, and when the surrounding belt is wound on the outer side of the pipeline, the rectangular through holes correspond to different positions of the pipeline.
2. The pipeline fluid thermal stratification monitoring device of claim 1, wherein: the extension cable comprises a thermocouple wire, an insulating layer wrapped on the outer side of the thermocouple wire, a shielding layer wrapped on the outer side of the insulating layer and a sheath wrapped on the outer side of the shielding layer.
3. The pipeline fluid thermal stratification monitoring device of claim 1, wherein: when the ring is wound on the outer side of the pipeline, the corresponding central angle between the adjacent rectangular through holes is 20-60 degrees.
Priority Applications (1)
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| CN202111297U (en) * | 2011-03-26 | 2012-01-11 | 宁波奥崎自动化仪表设备有限公司 | Thermocouple connector used on high-reliability occasions |
| CN203870989U (en) * | 2014-06-04 | 2014-10-08 | 四川材料与工艺研究所 | Multi-point thermocouple bundle measuring acquisition device on basis of nuclear power station accident simulation system |
| CN104535213B (en) * | 2015-01-19 | 2017-05-03 | 大连理工大学 | Fixture device for measuring temperature of outer wall of high-temperature pipeline |
| JP6591770B2 (en) * | 2015-03-31 | 2019-10-16 | 株式会社関電工 | Reactor temperature measurement device, molten state detection device, and water level measurement device in an emergency |
| CN105741894B (en) * | 2016-03-30 | 2019-04-26 | 宁波奥崎自动化仪表设备有限公司 | Used in nuclear power station 1E order reaction heap core temperature measuring device |
| CN105761767B (en) * | 2016-03-31 | 2017-11-17 | 中广核工程有限公司 | Nuclear power station pipeline outside wall surface temperature measuring equipment |
| CN107101740A (en) * | 2017-07-03 | 2017-08-29 | 安徽徽宁电器仪表集团有限公司 | A kind of thermocouple structure of ring multipoint acquisition |
| CN207408016U (en) * | 2017-11-28 | 2018-05-25 | 苏州热工研究院有限公司 | A kind of array temperature element |
| CN208000167U (en) * | 2017-12-27 | 2018-10-23 | 核动力运行研究所 | A kind of metal outer wall temperature measurement device |
| CN208351942U (en) * | 2018-06-19 | 2019-01-08 | 中广核工程有限公司 | Integral type nuclear power Special temperature measurement suit |
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