Device for welding heat-emitting elements

FIELD: atomic power engineering.

SUBSTANCE: device has welding chambers having apertures for inputting covers for pressurization, which concurrently are output apertures of heat-conductive elements, welding chambers electrodes, power source, transporting module for transverse product feed, common control system with blocks for parallel and serial connection, device for forming a break in secondary contour. Welding chambers are placed in parallel to each other at distance from each other, determined from formula S=t(m k+1), where S - distance between chambers axes, t - step of transport module, k - number of chambers in device equal to number of steps of transporting module in each singular step thereof, m - any integer starting from one, and control systems connected through parallel connection block to working tools of device of same names, and through block for serial connection to welding force drive and to device for forming break in secondary contour of power source, as well as to power source connected in parallel to welding chambers electrodes.

EFFECT: higher efficiency.

4 cl, 1 dwg

 

The invention relates to atomic energy and can be used for sealing contact-butt or arc welding rod fuel elements of nuclear reactors.

Fuel elements are zirconium tube filled with nuclear fuel in the form of tablets and helium high pressure. To ensure the required purity of the atmosphere internal volume of fuel elements before sealing vacuumized. Sealing is accomplished by welding the ends of the tube stub. Tube with end caps forms the fuel cladding. A known device for contact-butt welding (see A.S. USSR №941070 from 07.07.82,, Ál. 23 To 11/04), comprising a frame on which is mounted a welding chamber with the working chamber is provided with a through axial channels and associated with the means of creating a vacuum and supply of neutral gas feeder welded parts in the working cavity and the mechanisms of their capture, the drive of the welding pressure, where the welding chamber is perpendicular to the axis of the connector separating the working cavity into two parts, each of which is installed on the frame with the possibility of Autonomous movement, equipped with collet clamping mechanism for gripping the workpiece and tubular rods arranged in end-to-end Cana is Oh, connecting the hooks with the appropriate actuators, mounted on the ends of the welding chamber on both sides of the connector, the actuator welding pressure is connected rigidly with one of the actuators tubular rods with the possibility of joint movement. The disadvantage of this setup is the low performance.

Closest to the technical essence and the achieved effect is a device for sealing, part automatic lines for manufacturing fuel elements (see RF patent №2070740 from 17.05.94,, Ál. G 21 21/02, bull. No. 35 of 20.12.96 year), including welding chamber welders are parallel to each other and having apertures input curb shell for sealing, which is also the opening of the output from the device is sealed fuel element.

The disadvantage of this device is its low performance, due to the loss of time during the loading of the billet rods and their subsequent transport from the welding heads, roller conveyors, the use of two units with separate control systems and power sources, as a stable high-quality welding of two or more welds from one source is not possible. This requires additional manufacturing space, complicates the equipment, increases its value.

P is increased contamination of the welding chamber pulverized ceramic fuel particles, expelled in the process of evacuation and filling of a fuel rod with helium as a General pipeline connecting the welding chamber, with means for creating a vacuum and pressure, which also reduces the quality of welds and stability.

An object of the invention is to increase the plant productivity, stability and quality of welding, reduction of employment, industrial area, simplifying design and reducing the cost of the equipment.

The solution of the technical problem is achieved by the fact that the known device is a unit equipped with a module cross feed products, made in the form of an endless transport chain, with fixed thereto lodgments for products or, alternatively, in the form of a rack conveyor having a fixed cradles installed opposite the welding chambers, which are located apart from each other at a distance determined by the formula:

S=t(mk+1), where

S is the distance between the axes of the cameras,

t - step transport module.,

K - the number of heads in the aggregate, equal to the number of steps of the transport module in every single course,

m is any integer number, starting with one,

have the overall control system, connected through the block parallel with the same working parts of the device, and through the power of placentas is in turn driven welding force and create a gap in the secondary circuit of the power source, and from the very source that is connected in parallel to the electrodes of the welding chambers.

The solution of this problem is achieved by the combination of the described features. The presence of a transport module that provides both feeding and subsequent unloading of the two fuel rods, immediately after their exit from the welding cells, improves the performance of the unit. The necessary rhythmic flow billet fuel rods for welding cameras combined with the removal of these items already sealed products, which reduces the cycle time of products, and is achieved by the arrangement of the welding chambers at a distance determined by the formula;

S=t(mk+1), where

S is the distance between the axes of the cameras,

t - step transport module

k is the number of cells in the aggregate, equal to the number of steps of the transport module in every single course,

m is any integer starting from one.

With this arrangement, the welding chambers, each unit during transport module equal to 2t, opposite them is a new billet fuel to be processed.

As the welding time compared to other operations, much less the sequential execution from a single power supply connected in parallel to the welding electrodes of the cells has a significant value on the performance of Agra is ATA. However, this allows you to perform all other operations from one control and one set of switching equipment, which reduces the area occupied by the unit, it simplifies the device and improves the reliability of operation.

Having separate lines for evacuating and filling the inner volume of a fuel rod with helium reduces movement in the welding chambers fine dust of uranium dioxide flowing in the welding chamber in the process of creating in Fe atmosphere of a given composition and pressure. The proposed unit is illustrated by drawings.

The drawing is a schematic representation of an Assembly for sealing rods. To simplify the diagram shows only two of the welding chamber.

The unit consists of a transport module 1, for moving the cradle in which the endless strips or rails) 2 are arranged with a pitch t billet fuel elements or fuel rods 3. If as the conveying elements are used Reiki, the cradle conveyor 4 are fixed. On entry to and exit from the conveyor set handling storage devices 5 and 6, respectively, communicates with other technological systems, for example, by means of a roller table (not shown). From the end of the transport module installed welding chamber 7 at a distance from each other, fold his step , equipped with the actuator 8 of the feeding of fuel elements in the weld zone, the seals 9, 10, electrode-clamping devices 11, 12, providing a current supply to welded parts and their fixation in a predetermined position prior to welding. Electrode-clamping device can be a collet holders with the current-carrying surfaces driven by respective drives.

With the opposite end of the installed drive welding force, each of which except the first one along the transport module provided with a device 14 breaking the circuit of the welding power source 15 connected in parallel, electrode clamping devices 11, 12. The unit is operated from a common control system, consisting of a block of 16 parallel connection of the same name working bodies of the Assembly and block 17 switching actuators welding force 13, the device 14 breaking the circuit of the welding power source. The welding chamber through separate lines 18 and 19 through the switching unit 20 is connected to the means of creating a vacuum 21 and pressure 22. Before entering the vacuum line in the welding chamber installed filters 23.

The unit works in the following way. On the cradle 2 transport module 1 with rollup-boot device 5 is loaded billet fuel rods 3, while their open ends are against the brewing head 7. The ends of the blanks of the fuel rods 3, subject to welding, are located directly under the feed mechanism 8. Samples of fuel rods at the position determined by the corresponding sensors (not shown). Before the inclusion of the first actuator welding force 13 all operations, including loading the plugs, if necessary, are performed in parallel from the unit 16 of the control system. The feeders 8 billet rods are served in the welding chamber 7, which are fixed at the time of welding devices 11 and 12, which simultaneously are also current-carrying electrodes. The welding chamber sealed by seals 9, 10. Through switching equipment 20 and lines 18, 19 in the technological sequence is created under the shell of a fuel rod of the atmosphere of a given composition and pressure by means of devices 21 and 22. The evacuation is carried out through the filter 23. Then, one by one, starting from the camera (the first during transport module), equipped with a device 14 breaking the circuit of the source 15, through the block 17 includes drive welding force 13 simultaneously connect these cameras to a power source 15. Stub 24 in turn are welded to the ends of the fuel cladding. Then from block 16 after reset residues of helium in the vacuum line welding camera comes in its original state. The fuel rods welded to SAP what scami 24, mechanism 8 are unloaded onto the conveyor. Further movement of the conveyor and respectively billets and rods is carried out in a single stroke, each of which is equal to 2t.

The unit can also be used for arc welding. In this case, the need to drive welding force 13 disappears. The device 14 breaking the circuit source 15 can be used to change the distance between the electrodes and the fuel element.

The order of operation of the unit when it is used for arc welding remains the same.

1. Unit for welding fuel elements containing parallel spaced welding chamber having apertures for entry of shells on the seal, which holes are simultaneously output fuel elements, characterized in that the welding chamber is equipped with a module cross feed products, installed in increments determined by the formula

S=t(mk+l)

where S is the distance between the axes of the cameras,

t - step transport module

k is the number of cells in the aggregate, equal to the number of steps of the transport module in every single course,

m is any integer number, starting with one,

and connected through the block parallel with the same working bodies of the Assembly, and through the block serial enable driven welding force and the mustache is a device creating a gap in the secondary circuit of the power source, and from the very source that is connected in parallel to the electrodes of the welding chambers.

2. The Assembly according to claim 1, characterized in that the module cross feed products represents an endless transport chain mounted on it with a cradle for products.

3. The Assembly according to claim 1, characterized in that the module cross feed products is a system of movable and stationary rails with a fixed cradle for products installed in front of each head.

4. The Assembly according to claim 1, characterized in that the line vacuum welding chamber and its pressure is made separately.



 

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FIELD: atomic power engineering.

SUBSTANCE: device has welding chambers having apertures for inputting covers for pressurization, which concurrently are output apertures of heat-conductive elements, welding chambers electrodes, power source, transporting module for transverse product feed, common control system with blocks for parallel and serial connection, device for forming a break in secondary contour. Welding chambers are placed in parallel to each other at distance from each other, determined from formula S=t(m k+1), where S - distance between chambers axes, t - step of transport module, k - number of chambers in device equal to number of steps of transporting module in each singular step thereof, m - any integer starting from one, and control systems connected through parallel connection block to working tools of device of same names, and through block for serial connection to welding force drive and to device for forming break in secondary contour of power source, as well as to power source connected in parallel to welding chambers electrodes.

EFFECT: higher efficiency.

4 cl, 1 dwg

FIELD: nuclear power engineering; manufacture of fuel elements and their claddings.

SUBSTANCE: each weld of cladding and its plug are tested in facility equipped with units for clamping and revolving the claddings, scanning with carriage using weld inspection piezoelectric transducer and piezoelectric transducer for measuring wall thickness in measurement region, immersion bath, ultrasonic pulse generator, ultrasonic pulse receiver, microprocessor, analog-to-digital converter switch, and random-access memory.

EFFECT: enhanced quality of fuel elements and their operating reliability in reactor core.

1 cl, 1 dwg

FIELD: power engineering, namely nuclear power reactors, particularly sealing of fuel elements by means of contact butt welding with use of plugs.

SUBSTANCE: apparatus includes sealed welding chamber with housing non-detachable at operation and having through duct for feeding parts to welding zone; mechanisms for sealing welding chamber; device for feeding parts to welding zone; additional clamp of tube; mechanisms for gripping and fixing welded parts; drive device for supplying welding pressure; autonomous drive units. Mechanisms for gripping and fixing welded parts are in the form of collet chucks with respective drives. Welding pressure supply drive device is connected with electrode holder of plug. Welding chamber is restricted by non-detachable housing and flange-current supply lead that is fluid -tightly connected with housing and fixed relative to housing at operation. One collet chuck has annular detachable current supply lead in the form of sectors and it rests by its end at side of large base of petal cone upon said flange-current supply lead. Collet chuck of tube grip and electrode-holder of plug have coaxial electrically insulated one relative to other tie rods arranged in through duct of chamber and joined with autonomous drive units.

EFFECT: enhanced stability of process, improved quality of welded joint due to lowered misalignment of tube and plug.

1 dwg

FIELD: nuclear power engineering; manufacture of fuel elements for fuel assemblies of nuclear power reactors.

SUBSTANCE: proposed process line has mechanism for press-fitting bottom plug in calibrated end of can provided with cutoff gear for piece-by-piece feeding of bottom plugs of different types that incorporates bottom plug passage duct accommodating C-shaped member with reciprocating horizontal-motion actuator whose top flap has slot engageable with upper cylindrical part of bottom plug; bottom flap is longer than top one and is provided with bottom plug passage hole shifted toward edge of bottom flap; flaps are spaced apart through distance slightly longer than maximal length of thick end of bottom plug; rod designed for press-fitting bottom plug in calibrated end of can has bed with seat to receive bottom plug, maximal-size portion of seat following shape of bottom plug.

EFFECT: enlarged functional capabilities of process line for manufacturing fuel-element cans of different sizes.

1 cl 7 dwg

FIELD: mechanical engineering.

SUBSTANCE: proposed method is intended for manufacturing fuel elements using resistance-butt welding primarily for their joining to zirconium alloy cans. Welding is effected at equipment electrical resistance not over 30-fold resistance of can section forming welded joint having or not point discontinuities in the form of separate spots or chain of such spots forming no continuous line and measuring maximum ten thicknesses of weld in cross-sectional area of welded joint under check disposed at distance equal to two or three thicknesses of can wall from butt-end of plug located inside fuel element, welded joint being checked by uniformity of external fin. Length of poor fin formation section does not exceed 10% of joint perimeter.

EFFECT: enhanced quality of welds and reliability of fuel element sealing.

2 cl

FIELD: nuclear power engineering; tubular dispersed-core three-layer fuel elements.

SUBSTANCE: proposed method includes production of powder mixture, powder mixing in plasticizer environment, cold molding in core billet with plasticizer, thermal sintering, hot molding-calibration of fuel core, core placing in can made in the form of sleeve with annular slot, calibration, hot molding through die, and drawing; inner surface of external can of sleeve is provided with longitudinal bulges and outer surface bears bulge location marks; fuel core is provided with longitudinal flats and placed in sleeve taking care to align bulges of the latter with core flats; in the course of drawing marks are aligned on arbor ribs.

EFFECT: enhanced stability of active layer and can thickness in shaping polyhedral fuel elements.

1 cl, 4 dwg

FIELD: nuclear power engineering.

SUBSTANCE: proposed fuel assembly primarily designed for use in nuclear power reactors VVER-1000 and VVER-440 has composite bottom spacer grid built of at least two parts identical with respect to disposition of holes and total thickness of component parts equal to height of circular collar on bottom plug of fuel element, and tubular channel hole diameter for bottom plugs equal to diameters of lower ends of bottom plugs; the latter are secured in holes of aligned parts of bottom spacer grid by shifting component parts of bottom spacer grid relative to each other, by locking bottom plugs on circular collar of bottom plugs between annular projections of upper and lower parts of bottom spacer grid, and by aligning flow holes of bottom spacer grid component parts. Component parts of bottom spacer grid are rigidly fixed upon their shifting to bottom nozzle of fuel assembly in case of nonseparable type of assembly and loosely attached upon their shifting to bottom nozzle in case of separable type of assembly.

EFFECT: enhanced reliability of fixing fuel element plugs in bottom grid holes of separable and nonseparable fuel assemblies, reduced labor consumption for manufacture and assembly.

1 cl, 3 dwg

FIELD: nuclear power engineering; manufacture of fuel elements for fuel assemblies of power reactors.

SUBSTANCE: proposed process line has mechanism for weighing can charged with fuel pellets installed past retainer press-fitting mechanism; can is coupled through computer with mentioned weighing mechanism for outputting data on pure mass of pellets in can; γ-quanta detecting units and pellet enrichment automatic control installations are mounted on charged can guiding facility in the form of rolling train between its rollers throughout length of charged pellet stack; detecting units are disposed around pellet stack charged in can with collimation channels shifted throughout length of charged pellet stack; detecting units are provided with photoelectronic multipliers, spectrometers, and data acquisition, processing and outputting computer. Each detecting unit is provided with through hole passing can-displacement tungsten tube; shifted collimation channels are provided in top and bottom parts of tungsten tube; photoelectronic multipliers are disposed on butt-ends of detecting unit.

EFFECT: enhanced quality of fuel element manufacture.

3 cl, 3 dwg

FIELD: nuclear power engineering, possibly automatic line for producing fuel elements of fuel assemblies of power nuclear reactors.

SUBSTANCE: aggregate is provided with detachable device for measuring electric resistance of fitting. Said device is arranged between collet chucks being in open position and it is made of two dielectric members spring-loaded one relative to other. End of one of said members has shape corresponding to contour of annular turning formed coaxially on end of collet chuck for plug. End of second member has shape corresponding to contour of annular turning formed coaxially on end of fitting in collet chuck for fuel element envelope. Said device has spring-loaded contacts for measuring electric resistance between fitting inside collet chuck and collet chuck itself. Caprolactam is used as dielectric material.

EFFECT: enhanced efficiency and quality of contact butt welding at sealing fuel element.

2 cl, 3 dwg

FIELD: nuclear power engineering.

SUBSTANCE: members used for fastening fuel element in hole of bottom end spacer grid are made in the form of shortened plug that has coaxial blind hole on its butt-end formed by annular walls expanded (burnished) in hole of larger diameter within bottom end spacer grid.

EFFECT: enhanced reliability of fuel assembly, reduced manufacturing cost and structural material input.

1 cl, 3 dwg

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