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CN-116037807-B - Thermocouple wire and even wire fixing piece bending device of handheld nuclear power steam generator

CN116037807BCN 116037807 BCN116037807 BCN 116037807BCN-116037807-B

Abstract

The invention discloses a bending device for thermocouple wires and fixing pieces of a nuclear power steam generator, which respectively clamps and fixes two ends of the thermocouple wire fixing pieces, the thermocouple wire is inserted into the even wire fixing piece, and the S-shaped bending of the thermocouple wire and the even wire fixing piece is realized by pressing one end of the even wire fixing piece. In the bending process, the bending slide block and the hot end lower clamping plate in the device realize smooth guiding on the thermocouple wire fixing piece, so that the hot end thermocouple wire cannot be pressed into the thermocouple wire, the heat sensing wire in the thermocouple wire cannot be damaged, and the bending size can be determined only by measuring the distance of the bending slide block extending out of the shell.

Inventors

  • LU YANG
  • WANG ZUOSEN
  • ZHUANG SIMING
  • LI JINHAN
  • WANG QIANG
  • PAN HAIQUAN

Assignees

  • 哈电集团（秦皇岛）重型装备有限公司

Dates

Publication Date
20260508
Application Date
20211202

Claims (6)

  1. 1. A hand-held type nuclear power steam generator thermocouple wire and even wire mounting bending device is characterized in that, The bending device comprises a shell (1), a bending sliding block (2), a clamping seat (3) and a hot end lower clamping plate (4), wherein the shell (1) comprises a shell (11), a hot end upper clamping plate (12), a lower clamping plate stop block (13) and a rib plate (14), and the shell (11), the hot end upper clamping plate (12), the lower clamping plate stop block (13) and the rib plate (14) are fixedly connected to form a square cavity for the bending sliding block (2), the clamping seat (3) and the hot end lower clamping plate (4) to slide; The hot end upper clamping plate is of a solid square structure, and the bottom of the hot end upper clamping plate is provided with an even wire fixing piece clamping groove with the same outer diameter as that of the even wire fixing piece and a coaxial semicircular groove which can be penetrated by the thermocouple wire; The rib plate is of a plate-shaped structure, holes are formed in the rib plate, the width of each hole is larger than the outer diameter of the corresponding wire fixing piece, the height of each hole is larger than the distance between the upper top end and the lower bottom end of the corresponding wire after the corresponding wire penetrates through the corresponding wire fixing piece to realize S-shaped bending, the holes are waist-shaped holes, the clamping seat is placed in the square holes of the bending sliding blocks before the corresponding wire and the corresponding wire fixing piece are bent, the corresponding wire fixing piece is clamped and fixed between the clamping seat and the bending die-shaped clamping grooves of the bending sliding blocks, the clamping seat jackscrews are screwed into the threaded holes of the clamping seat jackscrews, and the bottoms of the clamping seat are propped against the corresponding wire fixing piece; Another part of even wire fixing piece is clamped and fixed between the hot end lower clamping plate and the hot end upper clamping plate, the jackscrew of the lower clamping plate is screwed into the jackscrew threaded hole of the lower clamping plate, and the bottom of the hot end lower clamping plate is propped against the even wire fixing piece; the top surface of the shell (11) is provided with a bending bolt threaded hole (111) into which the bending slide block jackscrew (5) is screwed, the bending slide block jackscrew (5) is screwed into the bending bolt threaded hole (111) and is pressed downwards in a pushing mode, and S-shaped bending of the thermocouple wire (91) and the even wire fixing piece (92) together is achieved.
  2. 2. The device according to claim 1, wherein the center of the bending slide block (2) is provided with a clamping seat chute (22), the top of the clamping seat chute (22) is provided with a bending die-shaped clamping groove (21), the clamping seat chute (22) can accommodate the clamping seat (3), the clamping seat (3) is provided with a groove body with the same shape as the bending die-shaped clamping groove (21), and a thermocouple wire (91) and an even wire fixing piece (92) are clamped between the bending die-shaped clamping groove (21) and the groove body of the clamping seat (3).
  3. 3. The device according to claim 2, characterized in that the bending die-shaped clamping groove (21) is in contact with the even wire fixing piece (92) and the position to be bent is provided with a bending circular arc.
  4. 4. A device according to claim 3, characterized in that the hot end lower clamping plate (4) is attached to the lower clamping plate stop (13) of the housing (1), which is provided with a bending arc identical to the bending die-shaped clamping groove (21) for smooth guiding.
  5. 5. A method for bending a thermocouple wire and an even wire fixing piece of a nuclear power steam generator, which is characterized in that the method is realized by using the hand-held bending device for the thermocouple wire and the even wire fixing piece of the nuclear power steam generator according to any one of claims 1 to 4, and comprises the following steps: step 1, fixing two ends of an even wire fixing piece (92), and enabling a thermocouple wire (91) to penetrate through the even wire fixing piece (92); step 2, pushing down the bending slide block jackscrew (5); And 3, drawing out the thermocouple wire (91) and the even wire fixing piece (92) after S-shaped bending along the kidney-shaped holes of the rib plate (14) of the shell (1).
  6. 6. Method according to claim 5, characterized in that in step 2 the bending slider jackscrew (5) is pretensioned so that it presses the bending slider (2) down along the square cavity of the housing (1), and the bending dimension is determined by measuring the distance the bending slider (2) protrudes out of the housing (1).

Description

Thermocouple wire and even wire fixing piece bending device of handheld nuclear power steam generator Technical Field The invention relates to the field of manufacturing of nuclear power steam generators, in particular to a bending device for a thermocouple wire and a pair wire fixing piece in a steam outlet pipe box of a steam generator. Background The nuclear power steam generator is used as one of the most critical equipment in a nuclear power station system, and has the function of converting the heat of a nuclear reactor into steam with the temperature of 600-650 ℃ to drive a steam turbine generator unit to generate electric energy. In order to accurately detect the heat exchange efficiency of the heat exchange tubes in different areas of the steam outlet end, a plurality of groups of temperature thermocouple wires are required to be installed at the steam outlet end to monitor the temperatures of different tube hole positions. The thermocouple wires are relatively precise and expensive heat sensing elements, and each thermocouple wire is wrapped in a sealed stainless steel shell with the diameter of 3mm and the wall thickness of 0.3mm by two temperature sensing wires through alumina powder. The number of the thermocouple wires is hundreds, the thermocouple wires are arranged on an orifice plate in a steam outlet pipe box with the diameter of 800mm according to a strict route, and the length of each thermocouple wire is different according to the different positions of the measured orifice holes. When the equipment is in operation, the steam flow rate at the orifice plate is up to 28m/s, and the thermocouple wire is fixedly connected with the orifice plate by welding, otherwise, the thermocouple wire is blown off by high-speed steam. The outer wall of the thermocouple wire is thin and cannot be directly welded, and the thermocouple wire is required to be welded and fixed with the pore plate through the even wire fixing piece. The even wire fixing piece is a tubular part sleeved outside the thermocouple wire, the wall thickness is 1.5mm, and the welding requirement can be met. As shown in fig. 1, each thermocouple wire 91 is sleeved with different numbers of even wire fixing members 92 from the heat transfer end according to the length and the arrangement on the orifice plate, and the thermocouple wire 91 reaches the last even wire fixing member 92 of the temperature measurement tube hole to be bent in an S shape and then welded with the orifice plate, so that the effect of axially fixing the thermocouple wire 91 and the even wire fixing member 92 is achieved, the thermocouple wire 91 and the orifice plate are lifted for a certain distance, the impact of steam on the thermocouple wire 91 is reduced, and the effect of protecting the thermocouple wire is achieved. The thermocouple wires 91 and the even wire fixing pieces 92 have strict requirements on bending dimensions, the thermocouple wires 91 are required to extend out of the even wire fixing pieces 92 by 5+/-0.5 mm in design, the thermocouple wires 91 can generate a small amount of extension during bending, the internal heat sensing wires are broken due to the fact that the extension is too large, the bending times of each thermocouple wire 91 are required to be not more than 2 times, folds and pits with depths exceeding 0.1mm are not allowed to appear in design, the height difference of the axes of the bent thermocouple wires 91 is 4+/-1 mm, the bending positions are smooth, and edges cannot be generated. In actual operation, the thermocouple wire 91 and the even wire fixing member 92 are bent, which has the following difficulties: (1) The metal material is usually bent by clamping one end, bending the other end through a tool and a die, wherein the thermocouple wire fixing piece has a diameter of 6mm and a length of only 20mm, the bending clamping end is only about 4mm according to the bending size, the common tool is difficult to clamp, and the thermocouple wire fixing piece and the thermocouple wire clamp are easy to be ellipsated; (2) The number of even wire fixing pieces on each thermocouple wire is required to be increased or decreased according to the arrangement route, and the even wire fixing pieces are required to be sleeved from the heat transfer end parts of the thermocouple wires, so that the thermocouple wire fixing pieces at the end parts cannot be bent in advance by adopting equipment outside a tube box, and can only be bent at the position close to an orifice plate in the steam outlet tube box, the space of the tube box is narrow, and the operation is difficult; (3) The thermocouple wire stretches out even line mounting size and bending forming size requirement are strict, and once forming difficulty is big, if adjust repeatedly can cause thermocouple wire outer wall fold, sunken even appear the crackle. (4) The thermocouple is installed as the final step in the manufacture of the steam generator, and the whole cleaning and drying o