10 results about "Spacer grid" patented technology

A spacer grid element defining a grid (17) for receiving nuclear fuel rods (4) extending along an extension axis (A) and presenting a polygonal cross section, comprising at least three support sides (20) distributed around the extension axis (A), wherein each support side (20) comprises an inwardly protruding corrugation (24) on which at least one spring (32) for supporting a fuel rod (4) extending through the spacer grid element is formed.

The invention relates to a ground-attached double-layer barrier water distributor, and belongs to the technical field of water distribution equipment, the structure of the water distributor comprises an energy-saving tank body, the upper part and the lower part of the energy-saving tank body are respectively provided with gravity flow gratings, and the two groups of gravity flow gratings divide the energy-saving tank body into a first uniform distribution area, a transition area and a second uniform distribution area from top to bottom; water distribution units are arranged in the first uniform distribution area and the second uniform distribution area; each water distribution unit comprises a main water supply pipe, a plurality of groups of auxiliary water supply pipes and a plurality of groups of uniform distribution outflow assemblies; the main water supply pipe is arranged in the energy-saving tank body, one ends of the auxiliary water supply pipes evenly communicate with the main water supply pipe, and the evenly-distributed outflow assembly communicates with the other ends of the auxiliary water supply pipes. The water distribution device has the technical effects that uniform water flow distribution of the whole tank section is realized, and impurities attached to the pipeline cannot be cleaned in time to maintain stable water distribution.

The utility model discloses a safety protection device for subway mechanical and electrical installation. The safety protection device comprises a protective fence and a grating net fixedly arranged in the protective fence. According to the protective fence, a frame is formed by transverse rods and vertical rods, connecting assemblies are arranged at the ends of the transverse rods, and different protective fences can be spliced. The grid net comprises rhombic or rectangular units. The protective fence is provided with a guide part and a sliding groove, a guide rod and a sliding block are installed in the sliding groove, and the sliding block is provided with a through hole matched with the guide rod and used for installing an illuminating lamp. The illuminating lamp is connected with the sliding block through a connecting mechanism, and the illuminating angle can be adjusted. The device effectively prevents personnel or articles from mistakenly entering a construction area, and ensures safe isolation. The design of the grid net ensures strength and stability, and observation and ventilation are facilitated. The guide component, the sliding groove, the sliding block and the guide rod provide stable and adjustable support for the illuminating lamp. The sliding block can freely slide to adjust the position of the lighting lamp, the connecting mechanism adjusts the irradiation angle, the lighting effect and use convenience are improved, misoperation is avoided, the accident probability is reduced, and the construction progress is guaranteed.

A nuclear fuel assembly comprises nuclear fuel rods (4) extending along a longitudinal axis (L) and a support skeleton (6) configured to support the nuclear fuel rods (4). The support skeleton (6) includes two end pieces (8, 10), a plurality of guide tubes (12) connecting the end pieces (8, 10) to each other, and spacer grids (14) attached to the guide tubes (12), with each spacer grid (14) supporting the nuclear fuel rods (4). The nuclear fuel assembly further includes at least one reinforcement device (20) comprising at least one reinforcement plate (22) which is in contact with at least two of the guide tubes (12) and attached to one or more of the guide tubes (12) at attachment points (21). Each reinforcement plate (22) has at least two attachment points (21) that are offset relative to each other along the longitudinal axis (L).

The spacer grid elements (18) define cells (16) for receiving nuclear fuel rods (4). The spacer grid elements (18) are configured to be arranged side-by-side with applying two side walls (22) of two adjacent spacer grid elements (18) one against the other. One of the two side walls (22) of at least one pair of side walls (22) applied against each other is provided with a lower flap (34) protruding from the lower edge of said side wall (22) such as to at least partially cover the lower edge (22A) of the other side wall and / or one of the two side walls (22) of said at least one pair of side walls (22) applied against each other is provided with an upper flap (34) protruding from the upper edge of said side wall (22) such as to at least partially cover the upper edge (22B) of the other side wall.

This disclosure relates to the field of isolation fence technology. One embodiment of this disclosure provides a wire mesh isolation fence that is easy to install and disassemble. It includes a first connecting frame, a first reinforcing plate, a connecting block, a second connecting frame, a protective net, a plug-in rod, a fixing block, a fixing pin, and a reinforcing mechanism. The first reinforcing plate is installed inside the first connecting frame, and the connecting block is slidably connected to the inside of the first reinforcing plate via an mounting groove. The second connecting frame is installed on the outer side of the connecting block, and the protective net is installed inside the second connecting frame. The outer surface of the plug-in rod penetrates the interior of the first reinforcing plate and the connecting block. The fixing block is slidably connected to the first connecting frame via an auxiliary groove. This technical solution addresses the problem in the prior art where it is difficult to replace parts of the wire mesh, leading to the need for operators to replace the entire mesh after partial damage.

The embodiment of the invention relates to the field of reactor fuel element assembly, in particular to a positioning grillwork suitable for a fuel assembly and the fuel assembly. The positioning grillwork comprises a frame and a plurality of grillwork units arranged in the frame in a matrix mode. Every two adjacent grillwork units are welded, each grillwork unit comprises four elements which are connected end to end, the four elements jointly form a channel for fuel elements to pass through, and each element abuts against the fuel element in the channel; the three elements of each grillwork unit are integrally formed parts, an elastic opening is formed in each integrally formed part, the fuel elements can enter the channels from the openings through elastic deformation of the integrally formed parts, and the fourth element of each grillwork unit is welded to the integrally formed parts after the fuel elements enter the channels. According to the positioning grillwork provided by the embodiment of the invention, the fuel element can be stably positioned, the fuel element can be prevented from being scratched in the assembling process, the risk that the fuel element is damaged and leaked is reduced, and the safety of the fuel assembly is improved.

A nuclear fuel mechanism and an assembly method for the nuclear fuel mechanism. The nuclear fuel mechanism comprises a lower end plug (1) of a fuel rod, a lower nozzle assembly (2), and an adjustment assembly (3). An adjustment member (32) can drive a connecting member (31) to move, causing a debris prevention plate (21) to move horizontally relative to a nozzle body (22). In this case, the central axis of a constraint through hole (211) in the debris prevention plate (21) is misaligned with the central axis of a constraint counterbore (221) in the nozzle body (22), such that a limiting portion (12) of the lower end plug (1) of the fuel rod is restricted below the debris prevention plate (21). By means of restricting the limiting portion (12) of the lower end plug (1) of the fuel rod between the debris prevention plate (21) and the nozzle body (22), the axial movement of the fuel rod is limited. When the clamping force of a spacer grid is lost, it is ensured that the fuel rod does not move axially under a hydraulic lifting force or when a fuel assembly is subjected to an axial impact load, thereby avoiding exacerbating fretting wear between the grid and the fuel rod, and preventing failure of the fuel rod caused by the fuel rod falling and impacting the lower nozzle assembly (2).

A nuclear fuel assembly suitable for a small modular reactor (SMR) comprises: a spacer grid 110 having 17x17 lattice cells 120; a plurality of fuel rods, each arranged within an associated lattice cel

The spacer grid (14) comprises a plurality of tubular cells (18) for receiving fuel rods (4), each cell (18) having a polygonal cross section, with at least two support faces (20) and at least two connecting faces (22) alternating around the central axis (C), each support face (20) having a given at least in part convex shape toward the inside of the cell (18), each support face (18) bearing a protruding element area (24) intended to contact the fuel rod (4); each connecting face (22) having a given at least in part concave shape toward the inside of the cell (18); the support face (20) of a given cell (18) lays against one of the connecting faces (22) of a neighbouring cell (18), the convex shape and the concave shape being such that more than 50% of a surface area of said support face (20) outside the protruding element area (24) is in contact with said connecting face (22).