CN-115910394-B - Lattice sliding device in bar bundle runner

CN115910394BCN 115910394 BCN115910394 BCN 115910394BCN-115910394-B

Abstract

The invention discloses a sliding device for a grid in a bar bundle runner, which at least comprises four strong magnets, supporting blocks, a control rod, pins, a plurality of bar bundles, grids and runner walls, wherein the supporting blocks are cylindrical, a space for embedding the strong magnets is reserved in the middle of each supporting block, the strong magnets are embedded in the supporting blocks, the upper surfaces and the lower surfaces of the strong magnets and the supporting blocks are kept flat, the number of the bar bundles is N, N is greater than or equal to two, the bar bundles are composed of sub-gram force pipes, the inner diameter of each sub-gram force pipe is larger than the cylindrical diameter of each supporting block, the outer diameter of each sub-gram force pipe is smaller than the inner diameter of a circular ring of each grid, the upper ends of the supporting blocks are provided with internal threads, the lower ends of the control rod are provided with external threads, the control rod and the supporting blocks are in threaded connection, the supporting blocks are driven by the control rod to slide up and down along the axial direction of the bar bundles, the bar bundles are sleeved in the circular ring of the grid, the grid is utilized by the fixing positions of the grids, small holes are reserved in the corresponding positions of the runner walls, and when the control rod moves up and down, the grid is driven to move to the preset positions, the pins are fixed on the runner walls.

Inventors

XIAO YAO
GU HANYANG
ZHANG HENGWEI
YAN XU
Cong tenglong
CHEN SHUO
LIU MAOLONG
GUO HUI

Assignees

上海交通大学

Dates

Publication Date: 20260512
Application Date: 20221121

Claims (9)

1. The utility model provides a lattice sliding device in bundle runner, its characterized in that includes four strong magnet, supporting shoe, control lever, pin at least to and a plurality of bundles, lattice and runner wall, wherein: The supporting block is cylindrical, and a space for embedding the strong magnet is reserved in the middle; the strong magnet is embedded into the supporting block, and the upper surface and the lower surface of the strong magnet and the upper surface and the lower surface of the supporting block are kept flat; The number of the bar bundles is N, N is greater than or equal to two, the bar bundles are composed of sub-gram force pipes, the inner diameter of each sub-gram force pipe is greater than the diameter of a cylinder of the supporting block, and the outer diameter of each sub-gram force pipe is smaller than the inner diameter of a ring of the grid; the upper end of the supporting block is provided with an internal thread, the lower end of the control rod is provided with an external thread, and the control rod is in threaded connection with the supporting block; the bar bundles are sleeved in the circular rings of the grids, and the bar bundles are fixed at positions by the grids; And small holes are reserved on the runner wall, internal threaded holes are reserved at corresponding positions of the grids, and when the control rod moves up and down to drive the grids to move to a preset position, the grids are fixed on the runner wall by adopting pins.
2. The lattice sliding device in a bundle runner according to claim 1, wherein the strong magnet is first machined into a circular arc shape with a diameter equal to the diameter of the support block.
3. A lattice sliding apparatus in a bundle runner according to claim 1, wherein the lattice is provided with a protrusion contacting the inner wall surface of the runner wall near the runner wall for securing the hard contact between the lattice and the runner to prevent the lattice from loosening.
4. The lattice slippage device in a bundle flow channel according to claim 1, wherein the number of the bundles is four, the bundles are respectively positioned at four corners of the bundle flow channel, and each bundle is internally provided with a supporting block embedded with a strong magnet.
5. The lattice slippage device in a bundle flow path according to claim 4 wherein the strong magnets of the support blocks in different bundles are oriented in unison.
6. A lattice slippage device in a bundle flow path according to claim 1 wherein the difference between the tube inside diameter of the sub-gram force tube and the cylinder diameter of the support block is no more than 0.1mm.
7. A lattice slippage device in a bundle flow path according to claim 1 wherein the lattice ring inside diameter differs from the sub-gram tube outside diameter by no more than 0.1mm.
8. The slippage device for the grillwork in a bundle flow channel according to claim 1, wherein pin holes are reserved on the grillwork corresponding to the bundles at the center of four sides of the bundle flow channel.
9. The lattice slippage device in a bundle flow path according to claim 1, wherein the lattice is made of stainless steel.

Description

Lattice sliding device in bar bundle runner Technical Field The invention relates to the technical field of experimental measurement of thermal fluid of a reactor, in particular to a grid sliding device in a bar bundle runner. Background In a nuclear power system, fuel rods are typically mounted in the reactor core in bundles. The grid is a key geometric component in the rod bundle flow channel, the positioning grid plays a role in positioning and fixing the fuel rods, and the mixing grid plays an important role in mixing, enhancing heat exchange and improving critical heat flow density among different sub-channels in the rod bundle flow channel. In the safety analysis of a reactor and the design of a novel grid, the measurement of the flow characteristics of the downstream of the grid in a bundle flow channel is required to be carried out, wherein the flow characteristics comprise a cold flow field, a gas-liquid two-phase flow phase field, a thermal temperature distribution, a steam distribution and the like. The rod bundle has a complex structure, and the probe and the silk screen sensor for measuring the gas-liquid two-phase flow are taken as examples, the sensor is installed in a certain axial position and in a flow channel in a specific experiment, the axial position of the sensor is very difficult to change, and the fine measurement of the downstream flow evolution of the experimental grid is difficult to perform. The invention provides a lattice sliding device in a bar bundle runner, which is arranged between the measurement requirements of a reactor thermal fluid experiment on downstream flow characteristics of a lattice. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a lattice sliding device in a bar bundle runner. In order to achieve the above object, the technical scheme adopted for solving the technical problems is as follows: The utility model provides a lattice sliding device in bundle runner, includes four strong magnet, supporting shoe, control lever, pin at least to and a plurality of bundles, lattice and runner wall, wherein: The supporting block is cylindrical, and a space for embedding the strong magnet is reserved in the middle; the strong magnet is embedded into the supporting block, and the upper surface and the lower surface of the strong magnet and the upper surface and the lower surface of the supporting block are kept flat; The number of the bar bundles is N, N is greater than or equal to two, the bar bundles are composed of sub-gram force pipes, the inner diameter of each sub-gram force pipe is greater than the diameter of a cylinder of the supporting block, and the outer diameter of each sub-gram force pipe is smaller than the inner diameter of a ring of the grid; the upper end of the supporting block is provided with an internal thread, the lower end of the control rod is provided with an external thread, and the control rod is in threaded connection with the supporting block; the bar bundles are sleeved in the circular rings of the grids, and the bar bundles are fixed at positions by the grids; And small holes are reserved on the runner wall, internal threaded holes are reserved at corresponding positions of the grids, and when the control rod moves up and down to drive the grids to move to a preset position, the grids are fixed on the runner wall by adopting pins. Preferably, the strong magnet is first-stage processed into a circular arc shape, and the diameter of the circular arc is equal to that of the supporting block. Further, the grid is provided with a protrusion which is in contact with the inner wall surface of the runner wall at a position close to the runner wall, and the protrusion is used for ensuring the hard contact between the grid and the runner so as to prevent the grid from loosening. Further, the number of the bundles is four, the bundles are respectively positioned at four corners of the bundle flow channel, and each bundle is internally provided with a supporting block embedded with a strong magnet. Preferably, the strong magnets of the support blocks in different bundles are oriented consistently. Preferably, the difference between the tube inner diameter of the subcritical force tube and the cylindrical diameter of the supporting block is not more than 0.1mm. Preferably, the difference between the inner diameter of the grid ring and the outer diameter of the subcritical force pipe is not more than 0.1mm. Further, pin holes are reserved on the grids corresponding to the bundles at the centers of the four sides of the bundle flow channel. Preferably, the lattice is made of stainless steel. Compared with the prior art, the invention has the following advantages and positive effects due to the adoption of the technical scheme: The invention provides a lattice sliding device in a bar bundle runner, which comprises a supporting block and a strong magnet, wherein the supporting block and the strong magnet are