Anti-deformation device for assembling and welding heat exchanger tube plate assembly

Abstract

The utility model discloses a heat exchanger tube plate assembly welding anti-deformation device which comprises a first arc plate (1) and a second arc plate (2) which are movably connected with each other, a first pin shaft (3) is arranged at the connecting position of the first arc plate (1) and the second arc plate (2), an ejector block (4) is arranged on the first arc plate (1), a connecting block (5) is arranged on the second arc plate (2), and the ejector block (4) is connected with the connecting block (5). The anti-deformation device further comprises a jacking column (6) and a movable joint screw rod (7). One end of the movable joint screw rod (7) is movably connected with the connecting block (5), the other end of the movable joint screw rod (7) is connected with the jacking column (6) in a screwing mode, one end of the jacking column (6) is connected with the movable joint screw rod (7) in a screwing mode, the other end of the jacking column (6) is a spherical surface, and the spherical surface can abut against the jacking block (4). According to the method, welding deformation of the heat exchanger tube plate assembly is further reduced in a symmetrical and segmented welding mode, so that the heat exchanger tube plate assembly meets the precision requirement of follow-up machining.

Description

Technical Field

[0001] The utility model relates to an assembly and welding auxiliary device for special equipment in the field of nuclear power. Background Art

[0002] The Hualong One PCS heat exchanger tube sheet assembly consists of a crescent-shaped tube sheet and a C-shaped cylinder part, both made of 022Crl9Nil0 austenitic stainless steel, with a length of 2000mm and an outer diameter of

[0003] The cross-section of the tube sheet is arc-shaped, the main structure is long and thin, the maximum thickness is 32mm, the thickness at the longitudinal seam groove is 6mm, there are 66 tube sheet holes in total, arranged in two rows, the tube hole diameter is The cylinder is made of thin-walled stainless steel with a wall thickness of only 6mm.

[0004] When processing the above-mentioned Hualong One PCS heat exchanger tube sheet assembly, it is necessary to separately process the cylinder parts and the tube sheet, and then weld the two sides of the tube sheet to the cylinder parts through two long welds to form a circumferentially closed tube sheet assembly, such as Figure 2 As shown in .

[0005] Since the rigidity of the tube sheet and the cylinder parts is poor and the longitudinal seam is long, the welding is easy to deform. After the welding is completed, the two ends need to be welded with the reducing tee and the head respectively, such as Figure 3 As shown in , it is necessary to ensure that the misalignment and welding deformation are small enough to meet the requirements of the drawing, otherwise the subsequent welding of reducing tees and heads will be difficult to carry out.

[0006] The practical challenges posed by this welding work for upstream production necessitate strict control of the roundness of the resulting tubesheet assembly, thereby ensuring the assembly accuracy and girth weld quality between the tubesheet assembly, reducing tees, and end caps. However, there are currently no publicly available welding technologies or equipment that can meet these requirements.

[0007] Based on the practical problems faced in the production and processing of the Hualong One PCS heat exchanger tube plate assembly, the inventors conducted in-depth research on the welding process in the hope of designing a welding auxiliary device that can solve the above problems. Utility Model Content

[0008] In order to overcome the above problems, the inventors have conducted intensive research and designed a heat exchanger tube sheet assembly welding anti-deformation device and a heat exchanger tube sheet assembly welding method. The device is arranged inside the heat exchanger tube sheet assembly and supports the heat exchanger tube sheet assembly from the inside, thereby preventing the heat exchanger tube sheet assembly from deforming during welding. The device includes two arc plates, whose curvature and size match the inner diameter shape and size of the heat exchanger tube sheet assembly. After the heat exchanger tube sheet assembly is welded to obtain a circumferentially closed cylindrical structure, the device can be quickly and conveniently disassembled and removed from the heat exchanger tube sheet assembly. In addition, the method further reduces the welding deformation of the heat exchanger tube sheet assembly through symmetrical and segmented welding, so that it meets the precision requirements of subsequent processing, thereby completing the utility model.

[0009] Specifically, the purpose of the present invention is to provide an anti-deformation device for the welding of a heat exchanger tube sheet assembly, which includes a first arc plate 1 and a second arc plate 2 that are movably connected to each other. The first arc plate 1 and the second arc plate 2 are used to tighten the cylinder part from the inside of the cylinder part, thereby maintaining the roundness of the heat exchanger tube sheet assembly during the welding process of the cylinder part and the longitudinal seam of the tube sheet.

[0010] A first pin shaft 3 is provided at the connection between the first arc plate 1 and the second arc plate 2 , and the first arc plate 1 and the second arc plate 2 are hingedly connected through the first pin shaft 3 .

[0011] Wherein, a top block 4 is provided on the first arc plate 1.

[0012] A connecting block 5 is provided on the second arc plate 2.

[0013] The anti-deformation device also includes a tightening column 6 and an articulated screw 7;

[0014] One end of the articulated screw rod 7 is movably connected to the connecting block 5, and the other end is screwed to the tightening column 6.

[0015] One end of the jacking column 6 is screwed to the articulated screw 7 , and the other end is spherical, and the spherical surface can be tightened on the jacking block 4 .

[0016] Among them, when the center of the first arc plate 1 coincides with the center of the second arc plate 2, the first arc plate 1 and the second arc plate 2 together constitute a large arc plate, and the outer diameter of the large arc plate is consistent with the inner diameter of the heat exchanger tube plate assembly.

[0017] The axis of the tightening column 6 and the axis of the articulated screw 7 both pass through the center of the large arc-shaped plate.

[0018] An annular slot 61 is provided on the tightening column 6 , and a nylon rope is tied to the tightening column 6 through the annular slot 61 .

[0019] Wherein, the heat exchanger tube sheet assembly is obtained by longitudinal seam welding of the cylinder parts and the tube sheet;

[0020] The cross section of the cylinder part is an arc shape.

[0021] The cross section of the tube sheet is a minor arc shape, and at least two rows of through holes for installing heat exchange tubes are opened on the tube sheet.

[0022] The beneficial effects of the utility model include:

[0023] (1) The heat exchanger tube sheet assembly welding anti-deformation device provided by the utility model is simple to operate and highly practical. By controlling the assembly gap and welding sequence of the longitudinal seam groove between the tube sheet and the cylinder, it can reduce the heat in and out during the welding process, avoid the inward collapse near the longitudinal seam, and ensure the roundness of the tube sheet assembly;

[0024] (2) The heat exchanger tube sheet assembly welding anti-deformation device provided by the utility model is particularly suitable for welding long longitudinal seams of shell and tube heat exchangers and longitudinal seams of small-diameter heat exchanger tube sheet assemblies, and can ensure the assembly accuracy and girth weld quality between the tube sheet assembly and the reducing tee and the head. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing the overall structure of a heat exchanger tube sheet assembly welding anti-deformation device;

[0026] Figure 2 A schematic diagram showing the structure of the Hualong One PCS heat exchanger tube sheet assembly;

[0027] Figure 3 A schematic diagram showing the structure of the Hualong One PCS heat exchanger tube sheet assembly when installing a reducing tee and a header;

[0028] Figure 4 The schematic diagram shows the structure of the heat exchanger tube sheet assembly when the anti-deformation device is installed in the tube sheet assembly.

[0029] Reference numerals

[0030] 1-First arc plate

[0031] 2-Second arc plate

[0032] 3-First pin

[0033] 4-Top block

[0034] 5-Connection Blocks

[0035] 6-Tightening column

[0036] 61-annular groove

[0037] 7-Joint screw

[0038] 8-Second pin

[0039] 91-Cylinder parts

[0040] 92-Tube Sheet DETAILED DESCRIPTION

[0041] The present invention will be described in further detail below through the accompanying drawings and examples, through which the features and advantages of the present invention will become more clearly understood.

[0042] The word "exemplary" is used exclusively herein to mean "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0043] According to the utility model, a heat exchanger tube plate assembly welding anti-deformation device is provided. Figure 1 and Figure 4 As shown in , the anti-deformation device is mainly used to ensure the roundness of the Hualong One PCS heat exchanger tube sheet assembly during welding, and to prevent defects such as thermal deformation that cause the dimensional quality to not meet the design requirements;

[0044] The anti-deformation device includes a first arc plate 1 and a second arc plate 2 that are movably connected to each other. The first arc plate 1 and the second arc plate 2 support the cylindrical part from the inside of the cylindrical part, thereby maintaining the roundness of the heat exchanger tube sheet assembly during the longitudinal seam welding process between the cylindrical part and the tube sheet.

[0045] Preferably, a first pin shaft 3 is provided at the connection between the first arc plate 1 and the second arc plate 2 , and the first arc plate 1 and the second arc plate 2 are hingedly connected through the first pin shaft 3 .

[0046] In the present application, the thickness of the first arc plate 1 and the second arc plate 2 is set to 10 to 40 mm; this thickness must ensure a sufficiently wide supporting surface and strength; excessively high thickness will result in a significant increase in weight, and when disassembling the device, the risk of damaging and scratching the inner wall of the heat exchange tube increases; based on this, preferably, the thickness of the first arc plate 1 and the second arc plate 2 is set to 30 mm.

[0047] In a preferred embodiment, a top block 4 is provided on the first arc plate 1. The first arc plate 1 and the top block 4 are an integral structure and can be solidified into one by welding. The top block 4 has at least one flat surface facing the inner side of the deformation device.

[0048] A connecting block 5 is provided on the second arc plate 2. The second arc plate 2 and the connecting block 5 are an integrated structure and can be solidified into one by welding.

[0049] The anti-deformation device also includes a tightening column 6 and an articulated screw 7;

[0050] One end of the articulated screw 7 is movably connected to the connecting block 5, and the other end is screwed to the jacking column 6. Preferably, one end of the articulated screw 7 is hinged to the connecting block 5 via a second pin 8; and the first pin 3 and the second pin 8 are arranged vertically here to facilitate the disassembly of the deformation device, and the length of the entire rod composed of the jacking column 6 and the articulated screw 7 can be controlled by screwing the jacking column 6;

[0051] One end of the jacking column 6 is screwed to the articulated screw 7 , and the other end is spherical, and the spherical surface can be tightened on the jacking block 4 .

[0052] In a preferred embodiment, when the center of the first arc plate 1 coincides with the center of the second arc plate 2, the first arc plate 1 and the second arc plate 2 together constitute a large arc plate, and the outer diameter of the large arc plate is consistent with the inner diameter of the heat exchanger tube plate assembly.

[0053] Preferably, when the spherical end of the jacking column 6 is pressed against the jacking block 4 , the axis of the jacking column 6 and the axis of the articulated screw 7 both pass through the center of the large arc-shaped plate.

[0054] In the present application, the outer diameter of the large arc plate is consistent with the inner diameter of the heat exchanger tube sheet assembly to be welded, so that the welding anti-deformation device can be in close contact with the heat exchanger tube sheet assembly, ensuring that the heat exchanger tube sheet assembly is deformed in all directions.

[0055] Preferably, a limiting device is also provided in the welding anti-deformation device, which limits the angle of rotation of the first arc plate 1 and the second arc plate 2 around the first pin 3 through the limiting device, so that the angle of outward rotation and expansion of the first arc plate 1 and the second arc plate 2 is limited, so that the anti-deformation device can expand outward to a maximum extent to generate the large arc plate, that is, the first arc plate 1 and the second arc plate 2 can be allowed to rotate outward to a position where the centers of each other coincide. By providing such a limiting device, in the actual working process, the movable screw 7 can be quickly screwed to control the outward rotation of the first arc plate 1 and the second arc plate 2 until it can no longer be screwed, and it is known that the limit position has been reached, without the need to measure the curvature or rotational elongation in real time; it can not only ensure the installation accuracy of the anti-deformation device, but also speed up the installation efficiency.

[0056] The limiting device can be set on the first arc plate 1, the second arc plate 2, or on the first pin 3; the limiting device can also be set on the articulated screw 7, and is achieved by limiting the maximum elongation of the articulated screw 7 and the tightening column 6.

[0057] In a preferred embodiment, an annular groove 61 is provided on the tightening column 6; a nylon rope is tied to the tightening column 6 through the annular groove 61, that is, the nylon rope is tied to the annular groove 61, so that the spherical end of the tightening column 6 can be pulled away from the top block 4 by pulling the nylon rope, so that the tightening column 6 is out of contact with the top block 4, and the first arc plate 1 and the second arc plate 2 can rotate around the first pin shaft 3 and approach each other.

[0058] In a preferred embodiment, the heat exchanger tube sheet assembly is obtained by longitudinally welding the barrel part 91 and the tube sheet 92. Figure 2 As shown in;

[0059] The cross section of the cylinder part is an arc shape.

[0060] The cross section of the tube sheet is a minor arc shape, and at least two rows of through holes for installing heat exchange tubes are opened on the tube sheet.

[0061] Installing the device into the tube sheet assembly includes the following sub-steps:

[0062] Sub-step 1: tie a nylon rope on the tightening column 6, ensure that one end of the nylon rope is outside the cylindrical part, and place the anti-deformation device inside the cylindrical part;

[0063] Sub-step 2: Place the spherical end of the jacking column 6 on the top block 4, and screw the articulated screw 7 to tighten the first arc plate 1 and the second arc plate 2 together to tighten the cylinder part;

[0064] Sub-step 3: Screw the articulated screw 7 to enlarge the diameter of the large arc plate formed by the first arc plate 1 and the second arc plate 2 until the diameter of the large arc plate is consistent with the inner diameter of the heat exchanger tube sheet assembly.

[0065] In a preferred embodiment, the cylindrical part 91 and the tube sheet 92 are required to be finely grooved before welding so that after the tube sheet and the cylindrical part are assembled, when the inner contour of the tube sheet cross section is cocircular with the inner contour of the cylindrical part cross section, a predetermined assembly gap is retained at each longitudinal seam;

[0066] Preferably, the assembly gap size is 4 to 6 mm.

[0067] When processing the grooves of the tube sheet and cylinder parts, ensure that the blunt edges of the tube sheet and cylinder parts are parallel after assembly, and parallel to the radial line of the theoretical groove position, rather than the extension line passing through the center of the circle, so as to ensure uniform assembly clearance.

[0068] There are four anti-deformation devices, and when installed in the heat exchanger tube plate assembly, the four anti-deformation devices are evenly arranged.

[0069] The Hualong One PCS heat exchanger tube sheet assembly obtained by welding with anti-deformation devices has good weld quality and meets the quality requirements of nuclear power equipment. The dimensional accuracy of the tube sheet assembly obtained by welding, including roundness and deformation, was tested and found to meet the design requirements of nuclear power equipment. No scratches or other damage were found on the inner wall surface of the tube sheet assembly. Even if the anti-deformation device is disassembled and removed, the tube sheet assembly will not be damaged. The tube sheet assembly can assist in obtaining the Hualong One PCS heat exchanger tube sheet assembly.

[0070] The present invention has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and serve only as illustrations. On this basis, various replacements and improvements can be made to the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A heat exchanger tube sheet assembly welding anti-deformation device, characterized in that: The anti-deformation device comprises a first arc plate (1) and a second arc plate (2) which are movably connected to each other, and the first arc plate (1) and the second arc plate (2) are used to tighten the cylinder part from the inside of the cylinder part, so as to maintain the roundness of the heat exchanger tube sheet assembly during the longitudinal seam welding process between the cylinder part and the tube sheet; A first pin shaft (3) is provided at the connection between the first arc plate (1) and the second arc plate (2), and the first arc plate (1) and the second arc plate (2) are hingedly connected via the first pin shaft (3); A top block (4) is arranged on the first arc plate (1). A connecting block (5) is provided on the second arc plate (2). The anti-deformation device also includes a tightening column (6) and an articulated screw rod (7); One end of the articulated screw rod (7) is movably connected to the connecting block (5), and the other end is screwedly connected to the tightening column (6). One end of the tightening column (6) is screwed to the articulated screw (7), and the other end is spherical, and the spherical surface can be tightened on the top block (4); When the center of the first arc plate (1) coincides with the center of the second arc plate (2), the first arc plate (1) and the second arc plate (2) together form a large arc plate, and the outer diameter of the large arc plate is consistent with the inner diameter of the heat exchanger tube sheet assembly; A limiting device is also provided in the welding anti-deformation device, which limits the rotation angle of the first arc plate (1) and the second arc plate (2) around the first pin shaft (3) through the limiting device, so that the angle of the first arc plate (1) and the second arc plate (2) rotating outward is limited, so that the anti-deformation device can expand outward to a maximum extent to generate the large arc plate, that is, the first arc plate (1) and the second arc plate (2) can be allowed to rotate outward to a position where the centers of the circles coincide with each other.

2. The heat exchanger tube sheet assembly welding anti-deformation device according to claim 1, characterized in that: The axis of the tightening column (6) and the axis of the articulated screw (7) both pass through the center of the large arc-shaped plate.

3. The heat exchanger tube sheet assembly welding anti-deformation device according to claim 1, characterized in that: An annular slot (61) is provided on the tightening column (6); a nylon rope is tied to the tightening column (6) through the annular slot (61).

4. The heat exchanger tube sheet assembly welding anti-deformation device according to claim 1, characterized in that: The heat exchanger tube sheet assembly is obtained by longitudinally welding the cylinder parts and the tube sheet; The cross section of the cylinder part is an arc shape. The cross section of the tube sheet is an inferior arc shape, and at least two rows of through holes for installing heat exchange tubes are opened on the tube sheet.

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