CN109378095B - End sealing structure of rod beam critical heat flux density test simulator - Google Patents
End sealing structure of rod beam critical heat flux density test simulator Download PDFInfo
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- CN109378095B CN109378095B CN201811214951.3A CN201811214951A CN109378095B CN 109378095 B CN109378095 B CN 109378095B CN 201811214951 A CN201811214951 A CN 201811214951A CN 109378095 B CN109378095 B CN 109378095B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/001—Mechanical simulators
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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
Abstract
The invention discloses an end sealing structure of a rod bundle critical heat flow density test simulator, which comprises a thermocouple tail signal acquisition cable, a simulator rod bundle pressure bearing shell, a sealing flange end cover connected with the pressure bearing shell and a simulator rod bundle positioned in an inner cavity of the pressure bearing shell, wherein one end of the thermocouple tail signal acquisition cable is positioned in the simulator rod bundle, the other end of the thermocouple tail signal acquisition cable penetrates out of the sealing flange end cover, a flexible sleeve member is arranged between the sealing flange end cover and the simulator rod bundle, a ceramic plate is welded on the inner side of the sealing flange end cover, a matching hole is formed in the ceramic plate, and hard connecting pieces are arranged at two ends of the flexible sleeve member. The invention realizes the high-temperature and high-pressure sealing of the simulated bar bundle and provides a measuring channel for the temperature of the inner tube of the simulated bar bundle. Meanwhile, the ceramic plate is welded between the end cover of the sealing flange and the end head of the sealing thread in a diffusion welding mode, so that the insulation between the end cover and the analog body rod bundle is ensured.
Description
Technical Field
The invention belongs to the field of sealing, and particularly relates to an end sealing structure of a rod-beam critical heat flow density test simulator.
Background
The core of commercial pressurized water and boiling water reactor nuclear power plants typically employs a bundle-type fuel assembly. The critical heat flux density is one of important thermal hydraulic limit values of the reactor core and is a key parameter for preventing the core from being melted down. In order to carry out reactor design and safety analysis, a corresponding rod bundle critical heat flux density test needs to be carried out, and core critical heat flux density prediction is carried out. In a rod bundle critical heat flux density test, the design and the manufacture of a simulated body rod bundle are required to be carried out based on the structure and the arrangement mode of a reactor core fuel assembly, and the nuclear heat release of the fuel assembly in the reactor core is simulated by loading high-power current on the simulated body rod bundle. In the whole critical heat flux density test process, a thermocouple is required to be arranged on the inner pipe wall of the simulated body rod bundle to monitor the wall surface temperature in real time. When the critical trigger wall temperature flies, the heating power of the analog body bar bundle is rapidly reduced, and the analog body bar bundle is prevented from being burnt.
In the existing design process of the simulated body rod bundle, guide holes are formed in end flanges of the simulated body one by one corresponding to the arrangement mode of the rod bundle, and the end flanges of the simulated body rod bundle are led out from the guide holes, so that a signal acquisition cable for critical monitoring thermocouples can be conveniently led out from the interior of the rod bundle. And meanwhile, a plurality of layers of O-shaped rubber sealing rings are adopted in each guide hole to realize the insulation sealing of the guide hole. The critical heat flux density test needs to be carried out under the operating condition of a high-temperature high-pressure reactor, the temperature change of the simulated body rod bundle is severe in the starting and stopping process of the test, so that the thermal expansion and the cold contraction of the O-shaped rubber sealing ring in the guide hole of the end flange are brought, the simulated body rod bundle also has remarkable thermal expansion and cold contraction in the axial direction, the relative sliding between the sealing surfaces is generated, the dynamic seal is formed, and the sealing failure of the guide hole of the end flange is easily caused. In order to prevent the sealing failure of the guide hole of the end flange caused by the temperature change, the sealing reliability of the end of the simulator is ensured by adopting a plurality of sealing flange plates in the conventional critical heat flow density simulator, and the assembly of the simulator is greatly difficult by the plurality of sealing flange plates.
Disclosure of Invention
The invention aims to provide an end sealing structure of a rod bundle critical heat flow density test simulator, which solves the problem that the sealing of a guide hole of an end flange of the existing simulator is easy to lose efficacy due to temperature change. Therefore, the end sealing structure of the rod bundle critical heat flow density test simulator is designed, the sealing performance of the end sealing structure is not influenced by temperature, the pressure boundary of the simulator is complete under high temperature and high pressure, and a measurement channel for the temperature of the inner tube of the simulator is provided; meanwhile, a plurality of sealing flange plates are not needed for sealing assembly, the assembly steps are simplified, and the assembly difficulty is reduced.
The invention is realized by the following technical scheme:
an end sealing structure of a rod bundle critical heat flow density test simulator comprises a thermocouple tail signal acquisition cable for measuring the temperature of the inner wall of the simulator rod bundle, a simulator rod bundle pressure bearing shell, a sealing flange end cover connected with the pressure bearing shell and the simulator rod bundle positioned in the inner cavity of the pressure bearing shell, wherein one end of the thermocouple tail signal acquisition cable is connected to the thermocouple tail of the simulator rod bundle for measuring the temperature of the inner wall, the other end of the thermocouple tail signal acquisition cable penetrates out of a through hole in the sealing flange end cover and then is connected into a wall surface temperature detection system, a high-temperature high-pressure sealing gasket is arranged between the pressure bearing shell and the sealing flange end cover, a high-temperature high-pressure flexible sleeve is arranged between the sealing flange end cover and the simulator rod bundle, a ceramic plate is welded on the inner side end surface of the sealing flange end cover, a matching hole coaxial with the through hole is arranged on the ceramic plate, and hard connecting pieces are arranged at two ends of the flexible sleeve, and the two ends of the flexible external member are both of a pressing static sealing structure, the hard connecting piece positioned at the upper end of the flexible external member is an upper hard connecting piece which is welded with the end part of the analog body rod bundle, the hard connecting piece positioned at the lower end of the flexible external member is a lower hard connecting piece which is welded with the ceramic plate, one end of the thermocouple tail signal acquisition cable, which is far away from the analog body rod bundle, sequentially passes through the upper hard connecting piece, the flexible external member, the lower hard connecting piece, the matching hole and the conducting hole and then is connected into the wall surface temperature detection system, the flexible external member and the thermocouple tail signal acquisition cable are both in a free bending state at the positions between the upper hard connecting piece and the lower hard connecting piece, and the two ends of the flexible external member 7 are both connected with the hard connecting pieces.
The flexible sleeve can adopt a metal corrugated pipe, a metal braided pipe and the like which are resistant to high temperature and high pressure.
The sealing flange end cover is connected with the end face of the pressure bearing shell through a bolt, and the bolt is screwed down so that the high-temperature and high-pressure sealing gasket is in a compression state and the sealing performance between the sealing flange end cover and the pressure bearing shell is ensured.
Because the heat release of the fuel assembly core in the reactor core is simulated by electrically heating the simulation rod bundle, an insulating component is required to be arranged at the corresponding part to prevent the current on the simulation rod bundle from being conducted to the sealing flange end cover and the pressure bearing shell to cause the heating of the sealing flange end cover and the pressure bearing shell, even the burning of the sealing flange end cover and the pressure bearing shell. In order to meet the insulation requirement, the insulation between the analog body bar bundle and the sealing flange end cover is realized by arranging a ceramic plate, the insulation between the pressure bearing shell and the sealing flange end cover is realized by arranging a high-temperature high-pressure sealing gasket, the gasket used by a bolt for connecting the sealing flange end cover and the pressure bearing shell is a gasket with an insulation layer, and an insulation sleeve is sleeved on the matched part of the bolt and the sealing flange end cover, so that the bolt is contacted with the sealing flange end cover through the insulation sleeve, and the insulation between the pressure bearing shell and the sealing flange end cover is realized.
In the prior art, a signal acquisition cable with a critical monitoring thermocouple led out from the interior of a rod bundle directly passes through a guide hole in a flange, and in order to seal the guide hole, multiple layers of O-shaped rubber sealing rings are adopted in the guide hole to realize insulation sealing of the guide hole. The simulation body rod bundle temperature change is violent in the test starting and stopping process, so that the expansion with heat and the contraction with cold of an O-shaped rubber sealing ring in a flange guide hole of the end head are caused, and meanwhile, the simulation body rod bundle also has remarkable expansion with heat and contraction with cold in the axial direction, so that the O-shaped rubber sealing ring in the guide hole is not only influenced by the temperature, but also bears the force applied by the simulation body rod bundle in the axial direction, and the flange guide hole is sealed and fails. In the prior art, the axial size change of the simulation body rod bundle caused by thermal expansion and cold contraction can cause relative slippage between all surfaces of the sealing part to form dynamic sealing.
Under the working condition of a high-temperature test, the flexible sleeve and the thermocouple tail signal acquisition cable are positioned in the flexible sleeve to form the flexible measurement channel, so that in the high-temperature and high-pressure test, the flexible measurement channel can be bent and deformed to absorb the thermal expansion of the analog body bar bundle in the axial direction, or the flexible measurement channel is stretched in the axial direction to correct the axial required length caused by cold contraction due to temperature reduction. Therefore, the sealing structure of the end is ensured to be kept unchanged all the time, the condition that relative sliding is generated between all the surfaces of the sealing part is avoided, and the sealing part is enabled to be kept in a static sealing state all the time, so that the sealing performance of the end of the test simulator is not influenced by temperature, the high-temperature and high-pressure sealing of the simulator rod bundle is realized, and meanwhile, a measuring channel for measuring the temperature of the inner tube of the simulator rod bundle is provided, so that the sealing of a guide hole for a cable to pass through on a flange is ensured; meanwhile, during assembly, the sealing plug is connected to the sealing threaded end which is welded in advance only by the sealing compression nuts at the two ends of the flexible sleeve, so that the assembly steps are simplified, and the assembly difficulty is reduced.
Furthermore, the hard connecting pieces comprise sealing plugs, sealing compression nuts and sealing thread ends which are coaxial with each other, wherein the sealing plugs and the sealing thread ends are provided with through holes through which thermocouple tail signal acquisition cables can pass; the sealing compression nut is of an end plug structure provided with a thread counter bore and a matching through hole, the thread counter bore is matched with the end of the sealing thread, and the matching through hole penetrates through the tail of the end plug and has a diameter smaller than the inner diameter of the thread; the diameter of the plug of the sealing plug is smaller than the inner diameter of the nut of the sealing compression nut, but is larger than the matching through hole on the end head of the sealing compression nut; the small-diameter section at the tail end of the sealing plug penetrates through the matching through hole from the threaded counter bore side of the sealing gland nut and then is connected with the flexible sleeve; the sealing compression nut is sleeved on the sealing plug, and the matching surface in front of the sealing plug and the matching surface at the top end of the sealing threaded end are compressed through the threaded matching between the sealing compression nut and the sealing threaded end, so that the sealing between the inside and the outside of the through hole of the hard connecting piece is realized;
in the upper hard connecting piece, the tail end of the small-diameter section of the sealing plug is connected with the top end of the flexible sleeve, and one end, far away from the sealing plug, of the sealing threaded end head is welded with the analog body rod bundle;
in the lower hard connecting piece, the tail end of the small-diameter section of the sealing plug is connected with the bottom end of the flexible sleeve, and one end, far away from the sealing plug, of the sealing threaded end head is inserted into a matching hole of the ceramic plate and is connected to the ceramic plate in a diffusion welding mode;
and after being led out from the end of the analog body rod bundle, the thermocouple signal acquisition cable sequentially passes through the through hole of the sealing threaded end in the upper hard connecting piece, the through hole of the sealing plug, the flexible sleeve piece, the through hole of the sealing plug in the lower hard connecting piece, the through hole of the sealing threaded end, the matching hole and the conducting hole and then is connected into the wall surface temperature detection system.
The two ends of the flexible sleeve are welded on the small-diameter sections of the corresponding sealing plugs.
The hard connecting piece is provided with a plurality of layers of sealing parts: the connection between the sealing plug and the flexible sleeve, the connection between the sealing plug and the sealing thread end, the connection between the sealing thread end and the ceramic plate or the connection between the sealing thread end and the simulation body rod bundle, and the connection between the sealing compression nut and the sealing thread end.
The hard connecting piece realizes the connection and fixation of the two ends of the flexible piece, and the flexible piece absorbs or makes up the axial extension or contraction of the analog body bar bundle.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the end sealing structure of the rod bundle critical heat flow density test simulator, the flexible measuring channel can be bent and deformed to absorb the axial thermal expansion of the rod bundle of the simulator; or the flexible measuring channel is stretched in the axial direction to compensate the axial required length caused by cold shrinkage due to temperature reduction, so that the sealing performance of the end sealing structure is not influenced by temperature, the high-temperature and high-pressure sealing of the simulated bar bundle is realized, and meanwhile, the measuring channel simulating the temperature of the inner tube of the bar bundle is provided, so that the sealing of a guide hole for the cable to pass through on the flange is ensured;
2. according to the invention, the ceramic plate is welded between the sealing flange end cover and the sealing thread end head in a diffusion welding manner so as to ensure the insulation between the sealing flange end cover and the electrified heating dummy bar;
3. according to the end sealing structure of the rod beam critical heat flow density test simulator, when the rod beam critical heat flow density test simulator is assembled, the sealing plug is connected to the sealing thread end which is welded in advance only by the sealing compression nuts at the two ends of the flexible sleeve, so that the assembling steps are simplified, and the assembling difficulty is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a flexible sleeve;
FIG. 3 is an enlarged view of a portion A of FIG. 2;
fig. 4 is a partially enlarged view of fig. 2 at B.
Reference numbers and corresponding part names in the drawings:
the method comprises the following steps of 1-simulating body bar bundle pressure bearing shell, 2-sealing flange end cover, 3-simulating body bar bundle, 4-thermocouple tail signal acquisition cable, 5-via hole, 6-ceramic plate, 7-flexible sleeve, 8-sealing plug, 9-sealing gland nut, 10-sealing thread end, 11-high-temperature insulating hose and 12-high-temperature high-pressure sealing gasket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
In this embodiment, the high-temperature and high-pressure flexible sleeve 7 is a high-temperature and high-pressure metal corrugated pipe.
As shown in fig. 1-4, the end sealing structure of the rod bundle critical heat flow density test simulator comprises a thermocouple tail signal acquisition cable 4 for measuring the temperature of the inner wall of the simulator rod bundle, a simulator rod bundle pressure bearing shell 1, a sealing flange end cover 2 connected with the pressure bearing shell 1 and the simulator rod bundle 3 positioned in the inner cavity of the pressure bearing shell 1, wherein one end of the thermocouple tail signal acquisition cable 4 is connected to the thermocouple tail of the simulator rod bundle 3 for measuring the temperature of the inner wall, the other end of the thermocouple tail signal acquisition cable penetrates out of a through hole 5 on the sealing flange end cover 2 and then is connected to a wall surface temperature detection system, a high-temperature and high-pressure sealing gasket 12 is arranged between the pressure bearing shell 1 and the sealing flange end cover 2, a metal corrugated pipe 7 is arranged between the sealing flange end cover 2 and the simulator rod bundle 3, and a ceramic plate 6 is welded on the inner side end surface of the sealing flange end cover 2, a matching hole coaxial with the conducting hole 5 is arranged on the ceramic plate 6, hard connecting pieces are arranged at both ends of the metal corrugated pipe 7, and both ends of the metal corrugated pipe 7 are provided with a pressing static sealing structure, the hard connecting piece positioned at the upper end of the metal corrugated pipe 7 is an upper hard connecting piece, which is welded with the end part of the analog body bar bundle 3, the hard connecting piece positioned at the lower end of the metal corrugated pipe 7 is a lower hard connecting piece, which is welded with a ceramic plate 6, one end of a thermocouple tail signal acquisition cable 4 far away from a simulation body rod bundle 3 sequentially passes through an upper hard connecting piece, a metal corrugated pipe 7, a lower hard connecting piece, a matching hole and a via hole 5 and then is connected with a wall surface temperature detection system, and the metal corrugated pipe 7 and the thermocouple tail signal acquisition cable 4 are positioned between the upper hard connecting piece and the lower hard connecting piece in free bending states, and two ends of the flexible sleeve 7 are connected with the hard connecting pieces.
The sealing flange end cover is connected with the end face of the pressure bearing shell through a bolt, and the bolt is screwed down so that the high-temperature and high-pressure sealing gasket is in a compression state and the sealing performance between the sealing flange end cover and the pressure bearing shell is ensured.
Since the nuclear heat release of the in-core fuel assembly is simulated by electrically heating the simulation body rod bundle 3, an insulating part needs to be arranged at the corresponding position to prevent the current on the simulation rod bundle 3 from being conducted to the sealing flange end cover 2 and the pressure bearing shell 1, so that the sealing flange end cover 2 and the pressure bearing shell 1 are heated and even burnt. In order to meet the insulation requirement, the insulation between the simulation body rod bundle 3 and the sealing flange end cover 2 is realized by arranging the ceramic plate 6, the insulation between the pressure bearing shell 1 and the sealing flange end cover 2 is realized by the arranged high-temperature high-pressure sealing gasket 12, and the surfaces of bolts for connecting the sealing flange end cover 2 and the pressure bearing shell 1 are coated with insulation layers.
In the prior art, a signal acquisition cable with a critical monitoring thermocouple led out from the interior of a rod bundle directly penetrates through a guide hole in a flange, and in order to seal the guide hole, multiple layers of O-shaped rubber sealing rings are adopted in the guide hole to realize insulation sealing of the guide hole. The simulation body rod bundle temperature change is violent in the test starting and stopping process, so that the expansion with heat and the contraction with cold of an O-shaped rubber sealing ring in a flange guide hole of the end head are caused, and meanwhile, the simulation body rod bundle also has remarkable expansion with heat and contraction with cold in the axial direction, so that the O-shaped rubber sealing ring in the guide hole is not only influenced by the temperature, but also bears the force applied by the simulation body rod bundle in the axial direction, and the flange guide hole is sealed and fails. In the prior art, the axial dimension change of the analog body rod bundle caused by thermal expansion and cold contraction can cause relative slippage between all surfaces of the sealing part, so that the dynamic seal is formed.
Under the working condition of a high-temperature test, the flexible sleeve and the thermocouple tail signal acquisition cable 4 are positioned in the flexible sleeve 7 to form a flexible measurement channel, so that in the high-temperature and high-pressure test, the flexible measurement channel can be bent and deformed to absorb the thermal expansion of the analog body bar bundle in the axial direction, or the flexible measurement channel is stretched in the axial direction to compensate the axial required length caused by the cold shrinkage due to the temperature reduction. Therefore, the sealing structure of the end is ensured to be kept unchanged all the time, the condition that relative sliding is generated between all the surfaces of the sealing part is avoided, and the sealing part is enabled to be kept in a static sealing state all the time, so that the sealing performance of the end of the test simulator is not influenced by temperature, the high-temperature and high-pressure sealing of the simulator rod bundle is realized, and meanwhile, a measuring channel for measuring the temperature of the inner tube of the simulator rod bundle is provided, so that the sealing of a guide hole for a cable to pass through on a flange is ensured; meanwhile, during assembly, the sealing plug is connected to the sealing threaded end which is welded in advance only by the sealing compression nuts at the two ends of the flexible sleeve, so that the assembly steps are simplified, and the assembly difficulty is reduced.
Example 2
This example is a concrete description of the hard joint in example 1.
As shown in fig. 1-4, each of the hard connecting pieces includes a sealing plug 8, a sealing gland nut 9 and a sealing threaded end 10, which are coaxial with each other, wherein the sealing plug 8 and the sealing threaded end 9 are respectively provided with a through hole for passing the thermocouple tail signal acquisition cable 4; the sealing compression nut 9 is of an end plug structure provided with a thread counter bore and a matching through hole, the thread counter bore is matched with the sealing thread end 10, and the matching through hole penetrates through the tail of the end plug and has a diameter smaller than the inner diameter of a thread; the diameter of the sealing plug 8 is smaller than the inner diameter of the threaded counter bore of the sealing compression nut, but larger than the matching through hole in the end head of the sealing compression nut; the small-diameter section at the tail end of the sealing plug 8 penetrates through the matching through hole from the threaded counter bore side of the sealing gland nut 9 and then is connected with the flexible sleeve 7; the sealing compression nut 9 is sleeved on the sealing plug 8, and is matched with the threads of the sealing threaded end 10 to compress the matching surface at the front end of the sealing plug 8 and the matching surface at the top end of the sealing threaded end 10, so that the sealing between the inside and the outside of the through hole of the hard connecting piece is realized;
in the upper hard connecting piece, the tail end of the small-diameter section of the sealing plug 8 is connected with the top end of the metal corrugated pipe 7, and one end, far away from the sealing plug 8, of the sealing threaded end 10 is welded with the analog body rod bundle 3;
in the lower hard connecting piece, the tail end of the small-diameter section of the sealing plug is connected with the bottom end of the flexible sleeve, and one end, far away from the sealing plug, of the sealing threaded end head is inserted into a matching hole of the ceramic plate and is connected to the ceramic plate in a diffusion welding mode;
after leading out from the end of the analog body rod bundle, the thermocouple signal acquisition cable sequentially passes through the through hole of the sealing threaded end in the upper hard connecting piece, the through hole of the sealing plug, the flexible sleeve piece, the through hole of the sealing plug in the lower hard connecting piece, the through hole of the sealing threaded end, the matching hole and the conducting hole and then is connected into the wall surface temperature detection system;
the two ends of the flexible sleeve 7 are welded on the small-diameter sections of the corresponding sealing plugs 8.
The hard connecting piece is provided with a plurality of layers of sealing parts: the connection between the sealing plug 8 and the metal corrugated pipe 7, the connection between the sealing plug 8 and the sealing thread end 10, the connection between the sealing thread end 10 and the ceramic plate 6 or the connection between the sealing thread end 10 and the simulation body bar bundle 3, and the connection between the sealing compression nut 9 and the sealing thread end 10.
The hard connecting piece realizes the connection and fixation of the two ends of the flexible piece 7, and the flexible piece 7 absorbs or compensates the extension or contraction of the simulation body bar bundle in the axial direction.
Example 3
This embodiment is an explanation of the fitting structure between the seal plug 8 and the threaded end 10 in embodiment 2.
As shown in fig. 1 to 4, the plug end of the sealing plug is in a truncated cone shape, a large diameter end of the sealing plug is connected with a small diameter section of the sealing plug, a horn hole coaxial with the through hole is arranged at one end of the through hole of the sealing threaded end 10 close to the flexible sleeve 7, a small diameter end of the horn hole is connected with the through hole, and when the plug end of the sealing plug 8 is matched with one end of the through hole of the sealing threaded end 10 close to the flexible sleeve 7, a side wall of the plug end is in contact with a hole wall of the horn hole. When the sealing thread end 10 is in threaded connection with the sealing gland nut 9, the hole bottom of the thread counter bore of the gland nut 9 is pressed on the large-diameter end face of the plug end of the sealing plug 8. The side wall of the plug end is in pressing contact with the wall of the horn hole, so that sealing between the simulation body rod bundle and the inner cavity of the pressure-bearing shell is realized.
Example 4
This example illustrates another embodiment of a hard attachment.
The hard connecting piece can only adopt the sealing thread end 10 and the sealing plug 8, and the connecting structure and the matching relation are the same as those of the embodiment 2.
Example 5
The welding between the sealing flange end cover 2 and the ceramic plate 6 and the welding between the lower hard connecting piece and the ceramic plate 6 are diffusion welding. The diffusion welding can realize reliable connection between welding parts made of different materials, and the sealing performance of the connecting part is improved. The sealing flange plate and the ceramic plate, and the ceramic plate and the thread sealing end are welded by diffusion, so that the insulation sealing in a high-temperature and high-pressure working environment is ensured.
Example 6
As shown in fig. 1 and 2, a high-temperature insulating hose 11 is sleeved on the metal corrugated pipe 7, and the metal corrugated pipe 7 is wrapped by the high-temperature insulating hose 11.
Example 7
As shown in fig. 1, there are two analog body bundles 3 in the analog body bundle pressure-bearing shell 1, the analog body bundles 3 correspond to one metal corrugated pipe 7 respectively, two ends of the metal corrugated pipe 7 are connected with corresponding parts through one hard connecting piece respectively, and the thermocouple tail signal acquisition cable 4 in each analog body bundle 3 passes through the corresponding metal corrugated pipe 7.
Example 8
This example is an illustration of the assembly of the present invention.
The end of each analog body rod bundle 3 is welded with a sealing thread end 10, and a thermocouple tail signal acquisition cable 4 in each analog body rod bundle 3 is led out from the sealing thread end 10. And sealing plugs 8 matched with the sealing threaded ends 10 are welded at two ends of the high-temperature high-pressure metal corrugated pipe 7. Before welding, a high-temperature insulating hose 11 is sleeved outside the high-temperature high-pressure metal corrugated pipe 7, and sealing plugs 8 at two ends are respectively provided with a sealing compression nut 9. The ceramic plate 6 and the sealing flange end cover 2 are both provided with measuring channel holes corresponding to the arrangement mode of the analog body rod bundles 3. And welding the ceramic plates 6 to the inner side of the sealing flange end cover 2 in a diffusion welding mode, and ensuring that the ceramic plates correspond to the measuring channel holes 12 in the sealing flange end cover 2 one by one. At the measuring channel hole of the ceramic plate 6, a sealing threaded end 10 located below the metal bellows 7 is welded, also by means of diffusion welding.
The simulator bundle 3 is arranged and assembled according to the core fuel assembly structure and then installed in the bundle simulator pressure-bearing shell 1. And (3) penetrating out the thermocouple tail signal acquisition cable 4 of each analog body rod bundle 3 from the high-temperature high-pressure metal corrugated pipe 7. And a sealing plug 8 at the upper end of the high-temperature and high-pressure metal corrugated pipe 7 is connected to a sealing threaded end 10 at the end part of the simulator bar bundle 3 through a sealing compression nut 9. And (3) the thermocouple tail signal acquisition cable 4 passes through the rear high-temperature high-pressure sealing gasket 4 and then sequentially passes through the measurement channel holes in the sealing flange end cover 2. The sealing plug 8 at the lower end of the high-temperature and high-pressure metal corrugated pipe 7 is connected to a sealing thread end 10 at the position of the measuring channel hole through a sealing compression nut 9. The sealing flange end cover 2 is connected to the end head of the rod bundle analogue body pressure bearing shell 1 through bolts and nuts.
One end of the thermocouple tail signal acquisition cable 4, which is far away from the simulator body rod bundle 3, sequentially penetrates through a through hole of a sealing threaded end 10 in the upper hard connecting piece, a through hole of a sealing plug 8, a metal corrugated pipe 7, a through hole of the sealing plug 8 in the lower hard connecting piece, a through hole of the sealing threaded end 10, a channel hole in the ceramic plate 6 and a channel hole in the sealing flange end cover 2 and then is connected to the wall surface temperature detection system.
The rod bundle critical heat flux density test body manufactured by adopting the sealing insulation mode is debugged on a certain test device, and the debugging result shows that the design has reliable work and convenient disassembly and assembly and can achieve the expected function.
In this embodiment, the passage hole in the ceramic plate 6 is a fitting hole in the previous embodiment, and the through hole 5 in the previous embodiment is sealed to the passage hole in the flange cover 2.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides an end seal structure of critical heat flux density test analog body of excellent bundle, including thermocouple afterbody signal acquisition cable (4) that are used for measuring analog body rod bundle inner wall temperature, analog body rod bundle pressure shell (1), with bear pressure shell (1) be connected seal flange end cover (2) and be located bear pressure shell (1) inner chamber simulate body rod bundle (3), thermocouple afterbody signal acquisition cable (4) are drawn forth from analog body rod bundle (3) one end, insert wall temperature detecting system, its characterized in that after passing through conducting hole (5) on seal flange end cover (2): a high-temperature high-pressure sealing gasket (12) is arranged between the pressure bearing shell (1) and the sealing flange end cover (2); be provided with high temperature high pressure flexible external member (7) between sealing flange end cover (2) and analog body rod cluster (3), the welding has ceramic plate (6) on the medial surface of sealing flange end cover (2), be provided with the mating holes coaxial with via hole (5) on ceramic plate (6), both ends at flexible external member (7) all are provided with hard connecting piece, the hard connecting piece that is located flexible external member (7) upper end is last hard connecting piece, it is the tip welding of analog body rod cluster (3) with it, the hard connecting piece that is located flexible external member (7) lower extreme is hard connecting piece down, it welds with ceramic plate (6), thermocouple afterbody signal acquisition cable (4) keep away from the one end of analog body rod cluster (3) and pass hard connecting piece in proper order, flexible external member (7), hard connecting piece down, access wall temperature detecting system behind mating holes and via hole (5), and flexible external member (7) and thermocouple afterbody signal acquisition cable (4) are located hard connecting piece and lower hard connecting piece and down The parts between the hard connecting pieces are in a free bending state, and two ends of the flexible sleeve (7) are connected with the hard connecting pieces.
2. The tip sealing structure of the rod bundle critical heat flow density test simulator according to claim 1, wherein: the hard connecting pieces comprise sealing plugs (8), sealing compression nuts (9) and sealing threaded ends (10) which are coaxial with one another, wherein the sealing plugs (8) and the sealing threaded ends (10) are provided with through holes through which thermocouple tail signal acquisition cables (4) can pass; the sealing compression nut (9) is of an end plug structure provided with a thread counter bore and a matching through hole, the thread counter bore is matched with the sealing thread end (10), and the matching through hole penetrates through the tail of the end plug and has a diameter smaller than the inner diameter of a thread; the diameter of the sealing plug (8) is smaller than the inner diameter of a threaded counter bore of the sealing compression nut, but is larger than a matching through hole in the end head of the sealing compression nut; the small-diameter section at the tail end of the sealing plug (8) penetrates through the matching through hole from the threaded counter bore side of the sealing compression nut (9) and then is connected with the flexible sleeve (7); the sealing compression nut (9) is sleeved on the sealing plug (8) and is matched with the threads between the sealing threaded end heads (10) to compress the matching surface at the front end of the sealing plug (8) and the matching surface at the top end of the sealing threaded end head (10) so as to realize the sealing between the inside and the outside of the through hole of the hard connecting piece;
in the upper hard connecting piece, the tail end of the small-diameter section of the sealing plug (8) is connected with the top end of the flexible sleeve (7), and one end, far away from the sealing plug (8), of the sealing threaded end (10) is welded with the analog body rod bundle (3);
in the lower hard connecting piece, the tail end of the small-diameter section of the sealing plug (8) is connected with the bottom end of the flexible sleeve (7), and one end, far away from the sealing plug (8), of the sealing threaded end (10) is inserted into a matching hole of the ceramic plate (6) and is welded to the ceramic plate (6);
after being led out from the end of the analog body rod bundle (3), a thermocouple tail signal acquisition cable (4) sequentially passes through a through hole of a sealing threaded end (10) in the upper hard connecting piece, a through hole of a sealing plug (8), a flexible sleeve (7), a through hole of a sealing plug (8) in the lower hard connecting piece, a through hole of the sealing threaded end (10), a matching hole and a conducting hole (5) and then is connected into a wall surface temperature detection system;
both ends of the flexible sleeve (7) are welded on the small-diameter section of the corresponding sealing plug (8).
3. The tip sealing structure of the rod bundle critical heat flow density test simulator according to claim 2, wherein: the welding between the sealing flange end cover (2) and the ceramic plate (6) and the welding between the sealing thread end (10) and the ceramic plate (6) are diffusion welding.
4. The tip sealing structure of the simulation body for the rod beam critical heat flow density test according to claim 1 or 2, wherein: the flexible sleeve (7) is sleeved with a high-temperature insulating hose (11), and the flexible sleeve (7) is wrapped by the high-temperature insulating hose (11).
5. The tip sealing structure of the simulation body for the rod beam critical heat flow density test according to claim 1 or 2, wherein: the flexible sleeve (7) is a metal corrugated pipe or a metal braided pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811214951.3A CN109378095B (en) | 2018-10-18 | 2018-10-18 | End sealing structure of rod beam critical heat flux density test simulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811214951.3A CN109378095B (en) | 2018-10-18 | 2018-10-18 | End sealing structure of rod beam critical heat flux density test simulator |
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| CN109378095B true CN109378095B (en) | 2022-09-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110415841B (en) * | 2019-07-01 | 2024-02-27 | 国核华清（北京）核电技术研发中心有限公司 | Critical heat flux density enhancement test device |
| CN113187898A (en) * | 2020-01-14 | 2021-07-30 | 国家电投集团科学技术研究院有限公司 | Sealing device for small penetrating piece on cavity and heat exchanger with sealing device |
| CN111766194B (en) * | 2020-07-15 | 2022-03-01 | 中国核动力研究设计院 | Lead penetration piece for high-temperature and high-pressure electrochemical corrosion experiment and assembling method thereof |
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