CN114382829B - Instrument guide assembly compacting vibration reduction mechanism - Google Patents
Instrument guide assembly compacting vibration reduction mechanism Download PDFInfo
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- CN114382829B CN114382829B CN202210021949.4A CN202210021949A CN114382829B CN 114382829 B CN114382829 B CN 114382829B CN 202210021949 A CN202210021949 A CN 202210021949A CN 114382829 B CN114382829 B CN 114382829B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/003—Remote inspection of vessels, e.g. pressure vessels
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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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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- General Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- High Energy & Nuclear Physics (AREA)
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- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to a compaction vibration reduction mechanism of an instrument guide assembly and a reactor, wherein the mechanism comprises an upper internal component supporting column and further comprises: the sliding guide rod and the elastic piece are hollow in the axial direction, the upper internal pile component supporting column is provided with a first guide hole in the axial direction, the sliding guide rod is arranged in the first guide hole on the upper internal pile component supporting column, the sliding guide rod can move in the axial direction, and the elastic piece is sleeved on the sliding guide rod. According to the scheme, the reactor core instrument guide assembly is located on the upper portion reactor internals support column, the whole assembly and the upper portion reactor internals achieve accurate centering and positioning, when the sleeve on the reactor core instrument guide assembly is inserted into the head guide section of the sliding guide rod downwards, the sliding guide rod is pushed to slide downwards, the sleeve is pressed upwards through the reaction force of the elastic piece, the lower end of the sleeve is restrained and fixed, and therefore the reactor core measuring instrument assembly of the channel in the sleeve is prevented from being influenced by water flow and generating potential vibration.
Description
Technical Field
The invention relates to the technical field of pressurized water reactor testing connection pipe sealing assemblies, in particular to a compaction vibration reduction mechanism of an instrument guide assembly.
Background
As shown in fig. 3, the existing core instrumentation channels are introduced from the pressure vessel head 111, introduced into the site location through the core instrumentation guide assembly 114, and run from the pressure vessel reactor test tubes 112, through the reactor test tube seal assembly 113, the core instrumentation guide assembly 114, the upper internals support column 115, and then to the top of the fuel assemblies 116. Since the distance from the pressure vessel header 111 to the core fuel assemblies 116 is far and the fuel assemblies 116 are distributed differently, the core instrumentation cannot be properly introduced into the core fuel assembly designated location without the instrumentation guide assembly. During the first installation of the core instrumentation and the replacement of the core instrumentation (the withdrawal of old instrumentation and the insertion of new instrumentation), the channel provides guidance for the core instrumentation components, ensuring that the core instrumentation can be successfully withdrawn along the guidance channel when inserted into the core at the designated site location and the instrumentation withdrawn.
Under each operating condition, the head cover chamber is affected by the fluid coolant, and if the reactor core instrument is not provided with a protection device, the head cover chamber is impacted by the fluid, so that the risk of the reactor core instrument being damaged and not working is increased. The instrument guide channel provides protection for the reactor core measuring instrument, and the potential vibration of the reactor core measuring instrument assembly caused by the influence of water flow is greatly reduced.
At present, as shown in fig. 4, the main bottom plate 1141, the instrumentation guide tube supporting rod 1143 and the instrumentation guide tube fixing base 1144 are welded to form a main body supporting structure, and the instrumentation guide tube 1145 and the telescopic double-layer sleeve 1142 are installed and fixed to form an integral structure of the instrumentation guide assembly for the reactor core. The core instrumentation guide assembly 114 is integrally mounted to the upper support plate of the upper internals and is movably coupled to the upper internals such that the core instrumentation guide assembly can be integrally lifted or inserted into the upper internals.
Referring to fig. 5, the telescopic double-layer sleeve 1142 mainly comprises a first sleeve 11421, a second sleeve 11422, a spring 11423, an inner sleeve 11424 and an outer sleeve 11425, wherein the inner sleeve 11424 is fixedly connected to the bottom plate 1141 through a fastening piece in a pressing manner, an inner hole of the inner sleeve is in butt joint with an outlet of a meter conduit to form a meter continuous channel, the outer sleeve 11425 can axially slide relative to the inner sleeve 11424, when the meter is in a low position, the double-layer sleeve is nested and contracted to be stored in a supporting column of an upper internal member in a pile, and the outer sleeve 11425 is tightly pressed downwards through the installed spring 11423 to fix the lower end of the outer sleeve 11425 and the supporting column and absorb vibration of the outer sleeve in the operation process; when the instrument is pulled up, the inner sleeve 11424 is lifted up along with the integral grid, the outer sleeve 11425 slides down relative to the inner sleeve 11424, the core instrument is always in a full-range guiding and protecting state, and the outer sleeve 11425 is not always separated from the upper supporting column in the process. When the instrument falls back to the reactor core, the double-layer sleeve stretches back into the supporting column again for storage.
The compression damping structure in the telescopic double-layer sleeve 1142 mainly comprises a first sleeve 11421 fixed on the bottom plate 1141, a second sleeve 11422 slidable relative to the first sleeve 11421, and both the first sleeve 11421 and the second sleeve 11422 are mounted outside the inner sleeve 11424 and coaxial with the inner sleeve 11424. The spring 11423 is sleeved on the inner sleeve 11424, and one end of the spring 11423 is abutted against the first sleeve 11421, and the other end is abutted against the second sleeve 11422. When the instrument is in the low position, the retractable double-layer sleeve 1142 is retracted in the support column, the spring 11423 is compressed, the second sleeve 11422 is pressed downwards, the second sleeve 11422 is attached to the outer sleeve 11425, and accordingly the spring pressing force is transmitted to the outer sleeve 11425, and the outer sleeve is pressed.
The telescopic double-layer sleeve 1142 realizes the pressing function through the sliding fit among the four relatively movable components, namely the first sleeve 11421, the second sleeve 11422, the inner sleeve 11424 and the outer sleeve 11425, has a complex structure, is relatively large in number of slidable components, increases the risk of interference in the operation process, and is complex in manufacturing and processing. Meanwhile, the telescopic double-layer sleeve can only realize compression vibration reduction of the outer sleeve, the lower end of the inner sleeve is a free end, no vibration reduction function is achieved, the lower end of the telescopic double-layer sleeve is located near the outlet of the reactor core, flow induced vibration is severe, and the protection effect on the reactor core instrument can be reduced when the lower end of the inner sleeve without vibration reduction constraint vibrates.
Disclosure of Invention
Based on the problems, such as complex overall structure and poor damping effect of the compression damping structure in the existing reactor core instrument guide assembly, the instrument guide assembly compression damping mechanism and the reactor are needed to be provided.
The invention provides a compaction vibration reduction mechanism of an instrument guide assembly, which comprises an upper internal pile component supporting column and further comprises: the sliding guide rod and the elastic piece are of a hollow structure in the axial direction, the upper internal pile member supporting column is provided with a first guide hole in the axial direction, the sliding guide rod is arranged in the first guide hole on the upper internal pile member supporting column, the sliding guide rod can move in the axial direction, the elastic piece is sleeved on the sliding guide rod, the upper end of the elastic piece is abutted to the sliding guide rod, and the lower end of the elastic piece is abutted to the upper internal pile member supporting column.
The instrument guide assembly compresses the vibration reduction mechanism, the reactor core instrument guide assembly is located on the upper internal pile member support column, the integral assembly and the upper internal pile member realize accurate centering and positioning, and meanwhile, the integral assembly and the upper internal pile member can move up and down along an axis relatively. When the sleeve on the reactor core instrument guide assembly is downwards inserted into the guide section of the head of the sliding guide rod, the sliding guide rod is pushed to downwards slide, the sleeve is upwards pressed by the reaction force of the elastic piece, and the lower end of the sleeve is restrained and fixed, so that the reactor core measuring instrument assembly of the channel in the sleeve is prevented from being influenced by water flow to generate potential vibration. The whole vibration reduction mechanism has the advantages of compact design, less relative movable parts, low risk of clamping, good reliability, simple manufacturing and mounting process, easy implementation and low manufacturing cost.
In one embodiment, the first guide hole comprises a first through hole and a second through hole which are coaxially communicated, the aperture of the first through hole corresponds to the diameter of a sleeve on the reactor core instrument guide assembly, the first through hole is positioned above the second through hole, and the diameter of the first through hole is smaller than the diameter of the second through hole; the sliding guide rod can axially move in the second through hole.
In one embodiment, a limiting block is arranged at the upper end of the sliding guide rod, the size of the limiting block is matched with the inner diameter of the second through hole, the diameter of the limiting block is larger than the inner diameter of the first through hole, a third through hole is formed in the limiting block along the axial direction of the sliding guide rod, the third through hole is communicated with the inside of the sliding guide rod, and the upper end of the elastic piece is in butt joint with the limiting block.
In one embodiment, the third through hole has an inverted triangle structure, and the structure of the third through hole corresponds to the structure of the lower end of the sleeve.
In one embodiment, the device further comprises an end plug, the end plug is arranged in the upper internal pile component supporting column, a limiting protrusion is arranged at one end of the end plug, which faces the second through hole, the limiting protrusion is arranged in the second through hole, the lower end of the elastic piece is in butt joint with the limiting protrusion, a second guide hole is formed in the end plug along the axial direction of the sliding guide rod, and the lower end of the sliding guide rod passes through the limiting protrusion and then is arranged in the second guide hole.
In one embodiment, the second guide hole includes a fourth through hole and a fifth through hole which are coaxially communicated, the inner diameter of the fourth through hole is larger than the inner diameter of the fifth through hole, the fourth through hole is located above the fifth through hole, the lower end of the sliding guide rod is located in the fourth through hole, and the diameter of the lower end of the sliding guide rod is larger than the inner diameter of the fifth through hole.
In one embodiment, the sliding guide rod is in clearance fit with the fourth through hole.
In one of the embodiments, the first through hole is a clearance fit with a sleeve on the core instrumentation guide assembly.
In one embodiment, the elastic member includes a compression spring sleeved on the sliding guide rod.
The invention also provides a reactor which is characterized by comprising a reactor body and the instrument guide assembly compression damping mechanism according to any one of the embodiment description of the application, wherein the instrument guide assembly compression damping mechanism is arranged on the reactor body.
Drawings
FIG. 1 is a schematic diagram of a compression damping mechanism for an instrument guide assembly according to one embodiment of the present invention;
FIG. 2 is a schematic view of a guide assembly of a core instrument according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a prior art core instrumentation channel;
FIG. 4 is a schematic view of the core instrumentation guide assembly of FIG. 3;
fig. 5 is a schematic view of the telescoping dual layer sleeve of fig. 4.
The figures are labeled as follows:
10. an upper internals support column; 101. a first through hole; 102. a second through hole; 20. a sliding guide rod; 201. a limiting block; 30. an elastic member; 40. an end plug; 401. a limit protrusion; 402. a fourth through hole; 403. a fifth through hole; 11. a bottom plate; 12. a sleeve; 13. the instrument catheter fixing seat; 14. an instrument guide pipe support rod; 15. an instrument catheter.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "horizontal," "inner," "axial," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "horizontal," "upper," "lower," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
As shown in fig. 3, the existing core instrumentation channels are introduced from the pressure vessel head 111, introduced into the site location through the core instrumentation guide assembly 114, and run from the pressure vessel reactor test tubes 112, through the reactor test tube seal assembly 113, the core instrumentation guide assembly 114, the upper internals support column 115, and then to the top of the fuel assemblies 116. Since the distance from the pressure vessel header 111 to the core fuel assemblies 116 is far and the fuel assemblies 116 are distributed differently, the core instrumentation cannot be properly introduced into the core fuel assembly designated location without the instrumentation guide assembly. During the first installation of the core instrumentation and the replacement of the core instrumentation (the withdrawal of old instrumentation and the insertion of new instrumentation), the channel provides guidance for the core instrumentation components, ensuring that the core instrumentation can be successfully withdrawn along the guidance channel when inserted into the core at the designated site location and the instrumentation withdrawn. Under each operating condition, the head cover chamber is affected by the fluid coolant, and if the reactor core instrument is not provided with a protection device, the head cover chamber is impacted by the fluid, so that the risk of the reactor core instrument being damaged and not working is increased. The instrument guide channel provides protection for the reactor core measuring instrument, and the potential vibration of the reactor core measuring instrument assembly caused by the influence of water flow is greatly reduced. At present, as shown in fig. 4, the main bottom plate 1141, the instrumentation guide tube supporting rod 1143 and the instrumentation guide tube fixing base 1144 are welded to form a main body supporting structure, and the instrumentation guide tube 1145 and the telescopic double-layer sleeve 1142 are installed and fixed to form an integral structure of the instrumentation guide assembly for the reactor core. The core instrumentation guide assembly 114 is integrally mounted to the upper support plate of the upper internals and is movably coupled to the upper internals such that the core instrumentation guide assembly can be integrally lifted or inserted into the upper internals. Referring to fig. 5, the telescopic double-layer sleeve 1142 mainly comprises a first sleeve 11421, a second sleeve 11422, a spring 11423, an inner sleeve 11424 and an outer sleeve 11425, wherein the inner sleeve 11424 is fixedly connected to the bottom plate 1141 through a fastening piece in a pressing manner, an inner hole of the inner sleeve is in butt joint with an outlet of a meter conduit to form a meter continuous channel, the outer sleeve 11425 can axially slide relative to the inner sleeve 11424, when the meter is in a low position, the double-layer sleeve is nested and contracted to be stored in a supporting column of an upper internal member in a pile, and the outer sleeve 11425 is tightly pressed downwards through the installed spring 11423 to fix the lower end of the outer sleeve 11425 and the supporting column and absorb vibration of the outer sleeve in the operation process; when the instrument is pulled up, the inner sleeve 11424 is lifted up along with the integral grid, the outer sleeve 11425 slides down relative to the inner sleeve 11424, the core instrument is always in a full-range guiding and protecting state, and the outer sleeve 11425 is not always separated from the upper supporting column in the process. When the instrument falls back to the reactor core, the double-layer sleeve stretches back into the supporting column again for storage. The compression damping structure in the telescopic double-layer sleeve 1142 mainly comprises a first sleeve 11421 fixed on the bottom plate 1141, a second sleeve 11422 slidable relative to the first sleeve 11421, and both the first sleeve 11421 and the second sleeve 11422 are mounted outside the inner sleeve 11424 and coaxial with the inner sleeve 11424. The spring 11423 is sleeved on the inner sleeve 11424, and one end of the spring 11423 is abutted against the first sleeve 11421, and the other end is abutted against the second sleeve 11422. When the instrument is in the low position, the retractable double-layer sleeve 1142 is retracted in the support column, the spring 11423 is compressed, the second sleeve 11422 is pressed downwards, the second sleeve 11422 is attached to the outer sleeve 11425, and accordingly the spring pressing force is transmitted to the outer sleeve 11425, and the outer sleeve is pressed. The telescopic double-layer sleeve 1142 realizes the pressing function through the sliding fit among the four relatively movable components, namely the first sleeve 11421, the second sleeve 11422, the inner sleeve 11424 and the outer sleeve 11425, has a complex structure, is relatively large in number of slidable components, increases the risk of interference in the operation process, and is complex in manufacturing and processing. Meanwhile, the telescopic double-layer sleeve can only realize compression vibration reduction of the outer sleeve, the lower end of the inner sleeve is a free end, no vibration reduction function is achieved, the lower end of the telescopic double-layer sleeve is located near the outlet of the reactor core, flow induced vibration is severe, and the protection effect on the reactor core instrument can be reduced when the lower end of the inner sleeve without vibration reduction constraint vibrates.
To solve the above problems, as shown in fig. 1, in an embodiment of the present invention, there is provided a meter guide assembly compression vibration reduction mechanism including an upper in-stack member support column 10, further including: the sliding guide rod 20 and the elastic piece 30, wherein the elastic piece 30 can be a compression spring, the inside of the sliding guide rod 20 is of a hollow structure along the axial direction, the upper internal pile member supporting column 10 is provided with a first guide hole along the axial direction, the sliding guide rod 20 is arranged in the first guide hole on the upper internal pile member supporting column 10, the sliding guide rod 20 can move along the axial direction, the elastic piece 30 is sleeved on the sliding guide rod 20, the upper end of the elastic piece 30 is abutted with the sliding guide rod 20, and the lower end is abutted with the upper internal pile member supporting column 10.
Specifically, as shown in fig. 2, the core instrumentation guide assembly of the present application includes a bottom plate 11, a sleeve 12, an instrumentation guide tube fixing 13, an instrumentation guide tube support 14, and an instrumentation guide tube 15, and since the core instrumentation guide assembly is the prior art, the connection relationship of the individual components in the core instrumentation guide assembly is not described here;
when the reactor core instrument guide assembly is used, the reactor core instrument guide assembly is located on the support column of the upper internals, the integral assembly and the upper internals are accurately centered and positioned, and meanwhile, the integral assembly and the upper internals can move up and down along the axis relatively to the upper internals. As shown in fig. 1, when the sleeve 12 of the core instrumentation guide assembly is downwardly inserted into the head guide section of the sliding guide bar 20, the sliding guide bar 20 is pushed to slide downwardly, the sleeve 12 is pressed upwardly by the reaction force of the elastic member 30, and the lower end of the fixed sleeve 12 is restrained, thereby reducing the potential vibration of the core instrumentation assembly of the channel in the sleeve 12 from the influence of water flow. The whole vibration reduction mechanism has the advantages of compact design, less relative movable parts, low risk of clamping, good reliability, simple manufacturing and mounting process, easy implementation and low manufacturing cost.
In some embodiments, as shown in fig. 1, the first guide hole in the present application includes a first through hole 101 and a second through hole 102 that are coaxially communicated, wherein the aperture of the first through hole 101 corresponds to the diameter of the sleeve 12 on the core instrumentation guide assembly, the first through hole 101 is located above the second through hole 102, and the diameter of the first through hole 101 is smaller than the diameter of the second through hole 102; the sliding guide 20 can move in the second through hole 102 along the axial direction, and the sliding guide 20 is limited in the second through hole 102 and cannot be separated from the first through hole 101.
In some embodiments, as shown in fig. 1, a stopper 201 is disposed at an upper end of a sliding guide 20 in the present application, a size of the stopper 201 is matched with an inner diameter of a second through hole 102, a diameter of the stopper 201 is larger than an inner diameter of a first through hole 101, a third through hole is disposed on the stopper 201 along an axial direction of the sliding guide 20, the third through hole is communicated with an inside of the sliding guide 20, and an upper end of an elastic member 30 is abutted against the stopper 201.
Since the size of the stopper 201 is matched with the inner diameter of the second through hole 102 and the diameter of the stopper 201 is larger than the inner diameter of the first through hole 101, the stopper 201 can only move in the second through hole 102, and meanwhile, since the stopper 201 is positioned at the upper end of the sliding guide rod 20, the sliding guide rod 20 can only move in the second through hole 102, when the sleeve 12 on the reactor core instrument guide assembly passes downwards through the first through hole 101 and enters the second through hole 102, the lower end of the sleeve 12 is inserted into the third through hole on the stopper 201, and then the sliding guide rod 20 is pushed to slide downwards, the sleeve 12 is pressed upwards by the reaction force of the elastic piece 30, and the lower end of the fixed sleeve 12 is restrained, so that the reactor core measuring instrument assembly of the channel in the sleeve 12 is reduced from being influenced by water flow and possible vibration is generated
In some embodiments, the third through hole in the present application is in an inverted triangle structure, and the structure of the third through hole corresponds to the structure of the lower end of the sleeve 12. Since the third through hole has an inverted triangle structure and the lower end of the sleeve 12 has an inverted triangle structure, the lower end of the sleeve 12 is conveniently inserted into the third through hole.
In some embodiments, as shown in fig. 1, the instrument guide assembly compression vibration reduction mechanism of the present application further includes an end plug 40, where the end plug 40 is disposed in the upper pile inner member support column 10, one end of the end plug 40 facing the second through hole 102 is provided with a limiting protrusion 401, the limiting protrusion 401 is located in the second through hole 102, the lower end of the elastic member 30 is abutted with the limiting protrusion 401, the end plug 40 is provided with a second guide hole along the axial direction of the sliding guide rod 20, and the lower end of the sliding guide rod 20 passes through the limiting protrusion 401 and is located in the second guide hole. End plug 40 serves to constrain the lower end of sliding guide 20 while ensuring that the entire meter channel is continuously intact.
Further, as shown in fig. 1, the second guiding hole in the present application includes a fourth through hole 402 and a fifth through hole 403 that are coaxially connected, the inner diameter of the fourth through hole 402 is larger than the inner diameter of the fifth through hole 403, the fourth through hole 402 is located above the fifth through hole 403, the lower end of the sliding guide 20 is located in the fourth through hole 402, the diameter of the lower end of the sliding guide 20 is larger than the inner diameter of the fifth through hole 403, and the sliding guide 20 is in clearance fit with the fourth through hole 402.
The invention also provides a reactor, which comprises a reactor body and the instrument guide assembly compression damping mechanism as described in any one of the embodiments of the application, wherein the instrument guide assembly compression damping mechanism is arranged on the reactor body.
In summary, the reactor core instrumentation guide assembly of the present disclosure sits on the upper internals support column, and the integral assembly and the upper internals are precisely centered and positioned while being movable up and down along an axis relative to the upper internals. The core instrumentation guide assembly is provided with instrumentation channel sleeves 12, the sleeves 12 being inserted into the upper internals support column channels to provide guide and protection channels for the instrumentation. The compression damping mechanism is arranged in the supporting column of the upper internal reactor component, so that the compression damping constraint on the lower end of the sleeve is realized when the reactor runs, the potential vibration of the reactor core measuring instrument assembly of the channel in the sleeve caused by water flow is avoided, and the reactor core measuring instrument is protected.
The compressing and vibration reducing structure consists of a sliding guide rod 20 and a compression spring, wherein the compression spring is sleeved on the outer circle of the sliding guide rod 20, the sliding guide rod 20 is installed at the bottom of a supporting column, the lower end of the sliding guide rod 20 is inserted into a fourth through hole 402 in an end plug 40 of the supporting column, the upper end of the sliding guide rod 20 is axially limited in the supporting column, the supporting column is prevented from being separated from the upper side, and the lower side is always not separated from the end plug. The sliding guide rod 20 is in clearance fit with the inner wall of the supporting column and the inner diameter of the end plug, so that the centering and relative sliding functions are ensured. When the reactor core instrument guide assembly is inserted downwards into the head guide section of the sliding guide rod, the sliding guide rod is pushed to slide downwards, the sleeve is pressed upwards through the compression reaction force of the compression spring, the lower end of the sleeve is restrained and fixed, and therefore the reactor core measuring instrument assembly of the channel in the sleeve is prevented from being influenced by water flow to generate potential vibration.
Through setting up the compression damping mechanism in sleeve lower extreme, realize upwards compressing tightly sleeve lower extreme through compression spring pretightning force to the reactor core measuring instrument subassembly of greatly reduced sleeve inner channel avoids the rivers to influence and produces the potential vibration. Meanwhile, the compaction vibration reduction mechanism is arranged at the lower end of the supporting post, can slide freely along the supporting post in the travel range, and cannot deviate from the supporting post. When the instrument is in a low position, the sleeve is pressed, and meanwhile, the instrument is also used as a part of the instrument channel to guide the instrument of the reactor core, so that the integrity of the instrument channel is ensured. The whole vibration reduction mechanism is compact in design, few in relative movable parts, low in risk of interference and good in reliability. Meanwhile, the manufacturing and mounting process is simple, the implementation is easy, and the manufacturing cost is low.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A meter guide assembly compression damping mechanism comprising an upper internals support column (10), characterized by further comprising: the sliding guide rod (20) and the elastic piece (30), wherein the sliding guide rod (20) is of a hollow structure in the axial direction, the upper internal pile component supporting column (10) is provided with a first guide hole in the axial direction, the sliding guide rod (20) is arranged in the first guide hole on the upper internal pile component supporting column (10), the sliding guide rod (20) can move in the axial direction, the elastic piece (30) is sleeved on the sliding guide rod (20), the upper end of the elastic piece (30) is abutted with the sliding guide rod (20), and the lower end of the elastic piece is abutted with the upper internal pile component supporting column (10);
wherein the first guide hole comprises a first through hole (101) and a second through hole (102) which are coaxially communicated;
the upper end of the sliding guide rod (20) is provided with a limiting block (201), the size of the limiting block (201) is matched with the inner diameter of the second through hole (102), the diameter of the limiting block (201) is larger than the inner diameter of the first through hole (101), the limiting block (201) is provided with a third through hole along the axial direction of the sliding guide rod (20), the third through hole is communicated with the inside of the sliding guide rod (20), and the upper end of the elastic piece (30) is abutted with the limiting block (201);
the instrument guide assembly compaction vibration reduction mechanism further comprises an end plug (40), the end plug (40) is arranged in the upper pile inner member supporting column (10), a limit protrusion (401) is arranged at one end of the end plug (40) towards the second through hole (102), the limit protrusion (401) is arranged in the second through hole (102), the lower end of the elastic piece (30) is abutted to the limit protrusion (401), a second guide hole is arranged in the end plug (40) along the axial direction of the sliding guide rod (20), and the lower end of the sliding guide rod (20) penetrates through the limit protrusion (401) and then is arranged in the second guide hole.
2. The instrumentation guide assembly compression damping mechanism according to claim 1, wherein the aperture of the first through hole (101) corresponds to the diameter of a sleeve (12) on the core instrumentation guide assembly, the first through hole (101) is located above the second through hole (102), and the diameter of the first through hole (101) is smaller than the diameter of the second through hole (102); the sliding guide rod (20) can move in the second through hole (102) along the axial direction.
3. The instrument guide assembly compression vibration reduction mechanism of claim 2 wherein the third through hole is of inverted triangular configuration, the configuration of the third through hole corresponding to the configuration of the lower end of the sleeve (12).
4. The meter guide assembly compression damper mechanism of claim 1, wherein the second guide hole comprises a fourth through hole (402) and a fifth through hole (403) that are coaxially communicated, an inner diameter of the fourth through hole (402) is larger than an inner diameter of the fifth through hole (403), the fourth through hole (402) is located above the fifth through hole (403), a lower end of the sliding guide rod (20) is located in the fourth through hole (402), and a diameter of a lower end of the sliding guide rod (20) is larger than an inner diameter of the fifth through hole (403).
5. The meter guide assembly compression damper mechanism of claim 4, wherein the sliding guide rod (20) is in clearance fit with the fourth through bore (402).
6. The instrumentation guide assembly compression damping mechanism according to claim 2, wherein the first through hole (101) is in clearance fit with a sleeve (12) on the core instrumentation guide assembly.
7. The instrument guide assembly compression damper mechanism of claim 1, wherein the resilient member (30) comprises a compression spring that is sleeved on the sliding guide bar (20).
8. A reactor comprising a reactor body and a meter guide assembly compression damper mechanism according to any one of claims 1 to 7, the meter guide assembly compression damper mechanism being disposed on the reactor body.
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| CN114382829A (en) | 2022-04-22 |
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