JPH0622238Y2 - Ring element type spacer - Google Patents

Description

[Detailed Description of the Invention] << Industrial field of application >> The present invention relates to a ring element type spacer, and in particular to a square outer peripheral side plate that binds a large number of ring elements in a circumscribed state by seam welding. The present invention relates to an outer peripheral side plate connection structure for achieving an endless state.

<< Prior Art >> Conventionally, in addition to the ring element type spacer as described above, even in a lattice type spacer in which a large number of supporting lattice plates intersect orthogonally and the outer peripheral side plate is fixedly mounted, the outer peripheral side plate Are joined by seam joining by TIG welding or the like to obtain an endless state. At this time, like the ring element type spacer illustrated in FIG. Or in its vicinity,
The butt welding part d is formed.

However, according to the above-mentioned conventional example, as shown in FIG. 6 exemplifying the lattice-shaped spacers, when the square-shaped channel box e is loaded on the fuel, the welding bead of the butt-welded portion as described above is loaded. If the ridge is large, the channel box e will come into contact with it, which will be a hindrance. Therefore, if this ridge is not acceptable, if it is out of the standard, a correction process must be performed. Becomes

Further, the channel box e is creep-deformed and deformed as shown by the broken line e'in FIG. 6 because a pressure difference is generated between the inside and the outside of the box e due to the progress of fuel combustion. Becomes

As a result, the corner portion of the channel box e is extremely close to the corner portion c of the outer peripheral side plate b as compared with the initial stage of combustion, and when the channel box is attached or detached during the periodic inspection, The contact with the corner portion c becomes a problem.

Therefore, in the above case, the swelling of the welding beam is particularly disliked, and in the ring element type spacer, the above contact becomes an important problem from the standpoint of strength, especially compared with the lattice type spacer. The radius of curvature of the ring element at the corner and the radius of curvature of the corner c of the outer peripheral side plate b are
Alignment with high accuracy is strictly required in manufacturing.

<Problems to be solved by the present invention> The present invention has been studied in view of the above-mentioned conventional problems, and in the ring element type spacer of claim (1), the joint portion of the outer peripheral side plate is formed in the corner portion. It is not necessary to obtain the corner portion in the side portion where the corner portions are continuously arranged, and as shown in FIG. 6, by selecting the center portion which is bent so as to separate from the outer peripheral side plate at the time of fuel combustion, the conventional example is selected. The required height of the welding beam and the manufacturing accuracy of the corners of the outer peripheral side plate, which have been required, can be greatly relaxed, and the manufacturing of this type of spacer will be quick and simple, and an inexpensive provision will be realized. That is the purpose.

In claim (2), in the above claim (1), by performing seam welding of the outer peripheral side plate on the ring element, not only the welding work is facilitated, but further to the ring element. By welding the continuous edge portions of the outer peripheral side plate individually, it is intended to facilitate the welding work and to reduce an undesired thermal influence on the ring element due to the welding.

According to claim (3), the joints by welding are not welded between the ring elements without being heat-conducted with the ring elements as described above. The purpose is to eliminate thermal adverse effects on the device.

<Means for Solving the Problems> In order to achieve the above-mentioned various objects, the present invention, in claim (1), binds a ring element, which is a large number of cylindrical members, into a square shape by an outer peripheral side plate in an circumscribed state. A fuel rod inserted into each ring element by a support spring and a fixed protrusion provided on these ring elements so that they are supported at a predetermined distance from each other. It is an object of the present invention to provide a ring element type spacer in which a welding fixing portion having joint end edges thereof connected by seam welding means is formed at a central portion in the longitudinal direction of the outer peripheral side plate.

In the present application, in the fuel spacer according to claim (2), the weld fixing portion according to claim (1) is formed by both joint edge portions and a weld portion directly connecting these, Each of the joint edge portions, the ring element and each indirect welded portion of the ring element and each of the joint edge portions are formed by the indirect welded portion, the claim (3) claims
The weld fixing portion of (1) is formed by both joint edge portions and a weld portion directly connecting these, and the weld fixing portion is located at an intermediate position between adjacent ring elements on the outermost peripheral side. The fact that it is arranged is its component.

<Operation> When the ring element type spacer according to claim (1) is used, the weld fixing portion is formed at the central portion of the outer peripheral side plate.Therefore, even when the channel box is loaded, the rise height due to the welding beam is increased. Not only does it hurt,
Even if the channel box is deformed due to combustion, the central part will be separated from the outer peripheral side plate, so there is no concern about occurrence of trouble, and therefore welding work without any particular restriction on the height of the welding bead can be performed, and the corner Since the welding beam does not exist in the portion, the work of aligning it on the outer peripheral side plate with the radius of the ring element is facilitated, and it is possible to meet the demand for high accuracy.

Next, in the case of claim (2), since the ring element is welded as a lining, the welding work is easy to perform. By welding to the ring element, the rise of the welding beam can be reduced, and moreover, the undesired thermal influence due to welding on the ring element can be reduced as compared with the former case.

In claim (3), in view of the thermal effect further, since the welding location of the outer peripheral side plate is selected between the ring elements that do not abut the ring element, the characteristics of the ring element are determined by the conduction of high temperature by welding. The problem of deterioration will be solved.

<Embodiment> The present invention will be described in detail with reference to the drawings. As shown in FIG. 1 (a), a large number of ring members 1, which are cylindrical members, are placed in an external contact state, and these are bundled into a square shape by an outer peripheral side plate. , The fuel spring A inserted into each ring element by the support spring 3 and the fixing projection 4 provided on these ring elements 1.
It is well known that they can be supported at a predetermined distance from each other.

In the present invention, in such a ring element type spacer, when the outer peripheral side plate 2 is continuously connected by the seam welding means by the joint edge portion 2a, it is provided in the convex arc-shaped corner portion 2b as in the conventional case. Instead of joining, the welding fixing portion 2d is formed by the above-mentioned welding at the central portion in the longitudinal direction of the side portion 2c which is continuous with the four corner portions 2b.

Here, the welding fixing portion 2d will be described in more detail.
In FIG. 2, the ring element 1 on the outermost peripheral side is fixed to each other by the welded portion 1a at the circumscribed portion thereof, and the outer peripheral side plate 2 is welded at the side plate welded portion 2e. , The welding fixing portion 2d, the joint end edge portion 2a is formed in a shape orthogonal to the longitudinal direction of the outer peripheral side plate 2, both the joint end edge portion 2a is in a butted state, the abutting portion is the corresponding ring. It is formed by seam welding with the element 1 circumscribed.

On the other hand, the embodiment shown in FIG. 3 is different from that shown in FIG. 2 only in that the joining edge portion 2a is cut obliquely to the longitudinal direction of the outer peripheral side plate 2. Therefore, by welding in this way, the abutting contact surfaces of both joint edge portions 2a become larger than the former, and the seam joint strength by welding can be enhanced.

Next, in the welding fixing portion 2d shown in FIG. 4, as in the above-mentioned embodiment, the joining end edge portions 2a are not separated but brought into a separated state, and both are circumscribed to the corresponding ring element 1. The joint edge portions 2a are individually welded by the ring element 1 to form indirect weld portions 2f, 2f '.

Further, in the embodiment shown in FIG. 5, the abutting portion of the joint edge portion 2a is arranged not at the outside of the ring element 1 but at the intermediate position between the adjacent ring elements 1, 1 on the outermost side. The welding fixing portion 2d is fixed at the position, and in the case of the embodiment, during the seam welding work, the ring element is prevented from being deformed by the heat, and the heat input amount by the welding is the spot. Compared to welding, seam welding is larger, but since the heat effect is greatly reduced, it is very effective for ring element type spacers that require particularly strict dimensional accuracy. Become.

<Effect of the Invention> Since the present invention is configured as described above, when the ring element type spacer of claim (1) is used,
Even if the welded fixing part has a swelling of the welding beam, it does not hinder the loading of the channel box, and the swelling also becomes an obstacle to the thermal strain of the channel box due to the combustion of fuel. Since there is no need for a correction process for removing the swell, therefore, the production thereof can be facilitated and the occurrence of an accident due to the swell of the welding beam can be eliminated.

Further, since there is no welded fixing portion in the corner portion, the corner portion of the outer peripheral side plate can be aligned with the radius of curvature of the ring element with high accuracy, and as a result, there is no trouble in the occurrence of the thermal strain.

In the case of claim (2), if the joint edges are butted, the welding is easily and firmly finished on the ring element, and the indirect welded part is formed without being butted. At this time, the welding strength becomes large, although it takes time, and it is also possible to make the rise due to the welding beam zero.

According to claim (3), since the outer peripheral side plate is welded to form the weld fixing portion without direct contact with the ring element, there is a concern that the dimensional accuracy may be deteriorated due to the heat influence on the ring element. And more reliable can be provided.

[Brief description of drawings]

1 (a) and 1 (b) are plan and front views, respectively, of a ring element type spacer according to the present invention, and FIGS. 2, 3, 4 and 5 show different examples of the same spacer. FIG. 6 is an enlarged schematic plan view of respective main parts, FIG. 6 is an explanatory plan view showing a deformation mode due to combustion of a channel box fitted on the outer periphery of a lattice type spacer, and FIG. 7 shows a conventional ring element type spacer. It is a partial plan schematic diagram. 1 ...... Ring element 2 ...... Outer side plate 2a ...... Join edge 2b ...... Corner 2c …… Side 2d …… Weld fixed part 2f, 2f '…… Indirect weld 3 …… Support spring 4 …… Fixed protrusion A …… Fuel rod

Claims (3)

[Scope of utility model registration request] 1. A ring element, which is a large number of cylindrical members, is bound in a square shape by an outer peripheral side plate in an circumscribed state,
A fuel rod inserted into each ring element is supported by a support spring and a fixed protrusion provided on these ring elements so as to be supported at a predetermined distance from each other, and is composed of a side portion and a convex arc-shaped corner portion. Because of the outer peripheral side plate,
A ring element type spacer comprising a welded fixed portion formed by joining seam welding edge portions of the welded edge portion at a central portion in the longitudinal direction of the side portion. 2. The weld fixing portion is formed by both joint edge portions and a weld portion in which these joint portions are directly connected to each other, or each joint edge portion, a ring element, and each joint end of the ring element. The ring element type spacer according to claim 1, wherein the spacer is formed by each indirect welded portion having the edge portions connected to each other. 3. A weld fixing portion is formed by both joint edge portions and a weld portion directly connecting these joint edge portions, and the weld fixing portion is located at an intermediate position between adjacent ring elements on the outermost peripheral side. The ring element type spacer according to claim 1, wherein the ring element type spacer is arranged.