CN112863716A - A special structure of formula of pushing down reloading for changing control rod assembly moving body - Google Patents
A special structure of formula of pushing down reloading for changing control rod assembly moving body Download PDFInfo
- Publication number
- CN112863716A CN112863716A CN202011620614.1A CN202011620614A CN112863716A CN 112863716 A CN112863716 A CN 112863716A CN 202011620614 A CN202011620614 A CN 202011620614A CN 112863716 A CN112863716 A CN 112863716A
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- moving body
- control rod
- outer sleeve
- rod assembly
- tooth
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/10—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
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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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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
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Abstract
The invention relates to a downward-pressing type special material changing structure for changing a control rod assembly moving body, which comprises an outer sleeve assembly; the moving body can at least partially extend into the outer sleeve component, and the moving body and the outer sleeve component can enable the moving body and the outer sleeve component to move relatively or be static relatively in the axial direction through the action of the locking structure. The invention has the following beneficial effects: according to the invention, under the operation of the refueling machine in the reactor core, the jacket assembly can be reliably locked and unlocked with the moving body, and the jacket assembly can participate in the whole refueling process along with the control rod moving body.
Description
Technical Field
The invention belongs to the field of nuclear industry, and particularly relates to a downward-pressing type material changing special structure for changing a control rod assembly moving body.
Background
The Chinese experimental fast reactor is the first sodium-cooled fast reactor in China, the appearance of the control rod assembly is the same as that of the fuel assembly, the structure of the control rod assembly is an integrated structure, and the refueling process flow of the control rod assembly is the same as that of the fuel assembly.
The control rod assembly in the 600MW demonstration fast reactor is improved on the basis of a Chinese experiment fast reactor structure and adopts a split structure, the control rod assembly consists of a control rod moving body and a control rod outer sleeve, and by adopting the structure, the height of a reactor container can be effectively reduced, the utilization rate of materials is improved, and the amount of nuclear waste is reduced. The control rod assembly is different from the fuel assembly in the material changing process after adopting a split structure, and the control rod moving body and the control rod outer sleeve are separately changed.
The control rod moving body is of a long rod-shaped structure, the total length is about 2000mm, the maximum outer diameter position is about 90mm, the outer main body is a thin-wall circular tube, the wall thickness is about 5mm, and the position of the moving body, which can be matched with the special material changing structure, is limited.
There is currently no refueling utility tool that can be used to replace the control rod moving body and the control rod outer sleeve.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a special push-down type material changing structure for a control rod assembly moving body.
The technical scheme of the invention is as follows:
a downward-pressing type material changing special structure for changing a control rod assembly moving body comprises an outer sleeve assembly; the moving body can at least partially extend into the outer sleeve component, and the moving body and the outer sleeve component can enable the moving body and the outer sleeve component to move relatively or be static relatively in the axial direction through the action of the locking structure.
Further, the push-down refueling special structure for replacing the control rod assembly moving body comprises a locking component arranged on the jacket assembly and a hump tooth arranged on the moving body; the hump teeth comprise upper hump teeth and lower hump teeth which are arranged oppositely; the upper hump tooth comprises a first inclined surface and a first tooth valley; the lower hump tooth comprises a second inclined surface, a third inclined surface, a second valley and an unlocking channel; two adjacent first tooth valleys respectively correspond to the second inclined plane and the third inclined plane;
when the locking part is locked, the locking part rises from the unlocking channel, descends after entering a first tooth valley along a first inclined plane, and enters a second tooth valley along a second inclined plane;
when the unlocking is carried out, the locking component rises from the second tooth valley, falls after entering the first tooth valley along the first inclined plane and enters the unlocking channel along the third inclined plane.
Furthermore, the downward-pressing type special material changing structure for changing the control rod assembly moving body comprises an upper transition head, an outer sleeve, a lower transition head and a pin which are fixedly connected in sequence; the locking component is a pin arranged on the upper transition head.
Further, in the above-mentioned push-down type refueling special structure for the control rod assembly moving body, the inner edge of the upper transition head is chamfered so as to provide guidance for the moving body to enter the outer sleeve assembly.
Further, in the above-described push-down refueling specific structure for the control rod assembly moving body, the cross-section of the outer thimble tube is polygonal to prevent rotation in the circumferential direction during the transfer and when inserted into the core small grid header.
Further, in the above-described push-down type refueling structure for the control rod assembly moving body, an elastic return assembly is further provided in the outer sleeve to ensure a lowering operation of the locking member.
Further, in the above-mentioned push-down type material changing dedicated structure for the control rod assembly moving body, the elastic restoring assembly includes a support base, a support sleeve and an elastic member; the supporting sleeve is arranged in the outer sleeve and is fixedly connected with the outer sleeve; a support baffle is arranged in the support sleeve; the supporting seat can move in the supporting sleeve along the axial direction, and the supporting seat is connected with the supporting baffle through an elastic component; the pins of the moving body can be in contact with the supporting seat so that the supporting seat drives the moving body to move.
Further, in the above-mentioned special push-down type material changing structure for a control rod assembly moving body, the support sleeve is in threaded connection with the lower transition head to realize fixed connection with the outer sleeve.
Further, in the downward-pressing type special material changing structure for the control rod assembly changing moving body, the supporting seat is of a barrel-shaped structure, the barrel-shaped structure is provided with an accommodating cavity for accommodating the moving body and a positioning shaft, and the supporting baffle is provided with a corresponding positioning hole.
Further, in the above-mentioned push-down type material changing dedicated structure for the control rod assembly moving body, the elastic member is a spring fitted around the positioning shaft.
The invention has the following beneficial effects:
1. according to the invention, under the operation of the refueling machine in the reactor core, the jacket assembly can be reliably locked and unlocked with the moving body, and the jacket assembly can participate in the whole refueling process along with the control rod moving body;
2. the locking and unlocking device is simple to operate, and the locking and unlocking of the moving body and the outer sleeve component can be realized only by pressing the moving body with a load;
3. the invention has simple structure, and the unlocking and locking of the outer sleeve component and the moving body can be realized only by the matching of the connecting pin column in the upper transition joint and the hump tooth on the moving body;
4. the elastic restoring component is arranged in the outer sleeve component to limit the downward pressure during the locking and unlocking operation, so that the outer sleeve component and the moving body are prevented from being unlocked when the grippers of other equipment in the material changing system grab the moving body operating head in the transferring process, and the reliability of the connection of the outer sleeve component and the moving body after being locked is improved;
5. the appearance and the shape of the jacket assembly are designed to be easy to clean and dry, the jacket assembly can be reused by cleaning and drying after the replacement operation of a moving body is completed, and under normal conditions, the jacket assembly does not need other maintenance except replacement of a wearing part.
Drawings
Fig. 1 is a schematic structural view (locked state) of a push-down type refueling structure for a control rod assembly moving body according to the present invention.
Fig. 2 is a schematic structural view (unlocked state) of the push-down type refueling specific structure for the control rod assembly moving body of the present invention.
Fig. 3 is a schematic cross-sectional view along AA in fig. 2.
Fig. 4 is a schematic view of a locking process of the locking structure.
Fig. 5 is a schematic view of an unlocking process of the locking structure.
In the above drawings, 1, an upper transition head; 2. a pin; 3. an outer sleeve; 4. a support sleeve; 5. a supporting seat; 6. a disc spring; 7. a lower transition head; 8. a pin; 9. a small grid plate header; 10. a moving body operating head; 11. an unlocking channel; 12. an upper hump tooth; 13. a lower hump tooth; 14. the material replacing machine grabs the gloves; 1201. a first inclined plane; 1202. a first valley; 1301. a second inclined plane; 1302. a third inclined plane; 1303. a second valley.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1 and 2, the present invention provides a downward-pressing type refueling specific structure for a control rod assembly moving body, including an outer jacket assembly; the moving body can at least partially extend into the outer sleeve component, and the moving body and the outer sleeve component can enable the moving body and the outer sleeve component to move relatively or be static relatively in the axial direction through the action of the locking structure.
As shown in fig. 4 and 5, the locking structure includes a locking member provided on the jacket assembly and hump teeth provided on the moving body; the hump teeth comprise an upper hump tooth 12 and a lower hump tooth 13 which are arranged oppositely; the upper hump tooth 12 comprises a first slope 1201 and a first valley 1202; the lower hump tooth 13 comprises a second slope 1301, a third slope 1302, a second valley 1303 and an unlocking channel 11; two adjacent first tooth valleys 1202 correspond to the second slope 1301 and the third slope 1302, respectively; when locking, the locking component rises from the unlocking channel 11, enters the first valley 1202 along the first inclined surface 1201 and then descends, and enters the second valley 1303 along the second inclined surface 1301; when unlocking, the locking component rises from the second valley 1303, descends after entering the first valley 1202 along the first inclined plane 1201, and enters the unlocking channel 11 along the third inclined plane 1302.
As shown in fig. 1, the outer sleeve assembly comprises an upper transition head 1, an outer sleeve 3, a lower transition head 7 and a pin 8 which are fixedly connected in sequence. The locking component is a pin 2 arranged on the upper transition head 1. The pin column 2 is used for matching with the upper hump tooth 12 of the moving body to realize the locking and unlocking functions of the jacket assembly and the moving body. Specifically, the upper end of the upper transition head 1 is opened with 6 through holes in a direction perpendicular to the central axis, and 6 pins 2 are installed therein. And the pin column 2 is riveted with the through hole of the upper transition joint and then spot-welded for fastening and looseness prevention. The overall appearance structure of the outer sleeve component is consistent with that of the control rod component outer sleeve, so that the outer sleeve component can be compatible with various devices in a refueling system when participating in the whole refueling process along with the moving body, such as: the system comprises an in-plant transport barrel, a new/exhausted component conversion barrel, a loading and unloading elevator hanging barrel and the like.
In this embodiment, the inner edge of the upper transition head 1 is chamfered. In this manner, the upper transition joint provides a guide for insertion of the mobile body into the jacket assembly.
As shown in fig. 3, the outer tube 3 has a polygonal cross-section to prevent rotation in the circumferential direction during transportation and insertion into the small grid header 9. The outer sleeve 3 is positioned at the lower part of the upper transition head 1 and is connected with the upper transition joint by welding. The lower part of the outer sleeve 3 is provided with a lower transition head 7, the lower transition head 7 is used for connecting the outer sleeve 3 and the pin 8, and the connection modes are all welded. The pins 8 support the jacket assembly, and the pins 8 can be inserted into the small grid plate header 9 of the reactor core. The outer sleeve 3, the lower transition head 7 and the pins 8 together provide structural support for the outer sleeve assembly.
An elastic return assembly is also arranged inside the outer sleeve 3 to ensure the descending action of the locking part. The elastic recovery assembly comprises a supporting seat 5, a supporting sleeve 4 and an elastic part; the supporting sleeve 4 is arranged in the outer sleeve 3 and is fixedly connected with the outer sleeve 3, so that a supporting and installing space is provided for the elastic part and the supporting seat 5. A support baffle is arranged in the support sleeve 4; the supporting seat 5 can move axially in the supporting sleeve 4, and the supporting seat 5 and the supporting baffle are connected through an elastic component; the pins of the moving body can contact with the supporting seat 5 so that the supporting seat 5 drives the moving body to move.
The support sleeve 4 is in threaded connection with the lower transition head 7 to achieve a fixed connection with the outer sleeve 3. The supporting seat 5 is of a barrel-shaped structure, the barrel-shaped structure is provided with a containing cavity for containing the moving body and a positioning shaft, and the supporting baffle is provided with corresponding positioning holes. The elastic component is a spring sleeved on the positioning shaft.
When the moving body is inserted into the housing, the pins at the lower part of the moving body are inserted into the supporting seat 5, and during the process of inserting the moving body, the supporting seat 5 is driven by the pins of the moving body to move downwards and simultaneously compress the elastic component (the disc spring 6 in the embodiment) positioned below the supporting seat 5. When the moving body and the outer sleeve component are locked, the disc spring 6 provides upward elastic force, the outer sleeve component moves downwards relative to the moving body, the pin columns 2 are attached to the second valleys 1303, the moving body and the outer sleeve component are pressed tightly, and reliability of the outer sleeve component after being connected with the moving body is improved.
In the embodiment, the hump teeth matched with the control rod assembly moving body and the outer sleeve assembly in a connecting mode are located on the upper portion of the operating head, two sections with different outer diameters exist on the lower portion of the operating head, the outer diameter of the upper portion is larger, the outer diameter of the lower portion is smaller, 6 uniformly distributed vertical grooves (unlocking channels 11) are machined in the section with the larger outer diameter, and then the hump teeth are machined in the top of each vertical groove in the anticlockwise direction.
Locking operation: when the jacket assembly and the moving body need to be locked, the refueling machine grabbing moving body operating head 10 inserts the whole moving body into the jacket assembly, the pin 2 of the jacket assembly enters the hump tooth vertical groove of the moving body, meanwhile, the pin at the lower end of the moving body enters the supporting seat 5 of the jacket assembly, the refueling machine grabbing sleeve 14 with a load presses the moving body downwards, the moving body drives the supporting seat 5 to move downwards in the downwards moving process, and the combined disc spring 6 is gradually compressed. When the connecting pin 2 contacts with the upper hump tooth 12, the moving body is inserted downwards to the lower limit position. When the lower limit is reached, the gripper component of the material replacing machine moves upwards, the moving body moves upwards under the upward elastic force provided by the combined disc spring 6, the connecting pin column 2 slides into the lower hump tooth 13 of the moving body, the connecting pin column 2 is tightly pressed with the lower hump tooth 13 under the elastic force of the disc spring 6, and the moving body and the outer sleeve component are locked, as shown in fig. 4.
Unlocking operation: when the jacket assembly and the moving body need to be unlocked, the refueling machine grabs the head of the moving body, the refueling machine grabbing sleeve 14 with load presses the moving body operating head 10 downwards, the moving body moves downwards, and at the moment, the connecting pin column 2 slides into the upper hump teeth 12 from the lower hump teeth 13. Then the gripper of the refueling machine moves upwards, the moving body moves upwards under the action of the elastic force of the combined disc spring 6, the pin 2 slides into the vertical groove from the upper hump tooth 12, the outer sleeve component is unlocked with the moving body, and the refueling machine continues to lift the moving body to draw the moving body out of the outer sleeve component, as shown in fig. 5.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (10)
1. A downward-pressing type material changing special structure for changing a control rod assembly moving body is characterized by comprising an outer sleeve assembly; the moving body can at least partially extend into the outer sleeve component, and the moving body and the outer sleeve component can enable the moving body and the outer sleeve component to move relatively or be static relatively in the axial direction through the action of the locking structure.
2. The push-down type refueling special structure for the control rod assembly moving body as set forth in claim 1, wherein the locking structure comprises a locking member provided on the jacket assembly and a hump tooth provided on the moving body; the hump teeth comprise upper hump teeth and lower hump teeth which are arranged oppositely; the upper hump tooth comprises a first inclined surface and a first tooth valley; the lower hump tooth comprises a second inclined surface, a third inclined surface, a second valley and an unlocking channel; two adjacent first tooth valleys respectively correspond to the second inclined plane and the third inclined plane;
when the locking part is locked, the locking part rises from the unlocking channel, descends after entering a first tooth valley along a first inclined plane, and enters a second tooth valley along a second inclined plane;
when the unlocking is carried out, the locking component rises from the second tooth valley, falls after entering the first tooth valley along the first inclined plane and enters the unlocking channel along the third inclined plane.
3. The structure for downward-push type refueling of a control rod assembly moving body as set forth in claim 2, wherein the jacket assembly comprises an upper transition head, an outer thimble, a lower transition head and a pin fixedly connected in this order; the locking component is a pin arranged on the upper transition head.
4. The structure for downward-push type refueling of the control rod assembly moving body according to claim 3, wherein the inner edge of the upper transition head is chamfered to provide a guide for the moving body to enter the jacket assembly.
5. The structure for a push-down refueling cartridge for a replacement control rod assembly moving body according to claim 3, wherein the outer sleeve has a polygonal cross-section to prevent rotation in a circumferential direction during transportation and insertion into the core small grid header.
6. The structure special for push-down reloading of control rod assembly moving bodies as set forth in any one of claims 3 to 5, wherein an elastic restoring member is further provided in the outer sleeve for securing a descending action of the locking member.
7. The structure special for push-down reloading for replacing a moving body of control rod assemblies as set forth in claim 6, wherein the elastic restoring assembly comprises a support base, a support thimble, and an elastic member; the supporting sleeve is arranged in the outer sleeve and is fixedly connected with the outer sleeve; a support baffle is arranged in the support sleeve; the supporting seat can move in the supporting sleeve along the axial direction, and the supporting seat is connected with the supporting baffle through an elastic component; the pins of the moving body can be in contact with the supporting seat so that the supporting seat drives the moving body to move.
8. The push-down refueling unique structure for a control rod assembly moving body as set forth in claim 7, wherein the support thimble is threadedly connected to the lower transition head to achieve a fixed connection with the thimble.
9. The structure for downward-push type refueling of the control rod assembly moving body as set forth in claim 7, wherein the support base is a barrel structure provided with a receiving cavity for receiving the moving body and a positioning shaft, and the support flapper is provided with a corresponding positioning hole.
10. The structure dedicated to push-down type replacement for a control rod assembly moving body according to claim 9, wherein the elastic member is a spring fitted over the positioning shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620614.1A CN112863716B (en) | 2020-12-30 | 2020-12-30 | A special structure of formula of pushing down reloading for changing control rod assembly moving body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620614.1A CN112863716B (en) | 2020-12-30 | 2020-12-30 | A special structure of formula of pushing down reloading for changing control rod assembly moving body |
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| CN112863716A true CN112863716A (en) | 2021-05-28 |
| CN112863716B CN112863716B (en) | 2022-12-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113782240A (en) * | 2021-08-11 | 2021-12-10 | 中国原子能科学研究院 | Replacing tool for control rod moving body |
| CN113871043A (en) * | 2021-09-26 | 2021-12-31 | 中国原子能科学研究院 | Method for replacing outer sleeve of control rod assembly in reactor core |
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| CN112863716B (en) | 2022-12-13 |
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