Double-layer spiral coil pipe heat treatment anti-deformation fixing device and method thereof

Abstract

The invention discloses a double-layer spiral coil pipe heat treatment anti-deformation fixing device which comprises an inner cylinder, an outer cylinder, an angle scale, a double-layer spiral coil pipe, screw pitch division bars and pressing blocks, the double-layer spiral coil pipe comprises an inner-layer spiral coil pipe and an outer-layer spiral coil pipe, the screw pitch division bars comprise the first screw pitch division bar and the second screw pitch division bar, and the pressing blocks comprise the first pressing block and the second pressing block. A pre-tightening piece is arranged on the angle scale; the inner cylinder is sleeved with the double-layer spiral coil pipe, a plurality of first screw pitch division bars are evenly distributed outside the inner-layer spiral coil pipe, the inner-layer spiral coil pipe is sleeved with the outer cylinder, a plurality of second screw pitch division bars are evenly distributed outside the outer-layer spiral coil pipe, and an angle scale is arranged on one side of the double-layer spiral coil pipe; the device is simple in structure, good in fixing effect, good in concentricity and simple and feasible in fixing method, and the angle of the spiral pipe is not easy to change through combined fixing of the inner and outer cylinders and the angle scale.

Description

Technical Field

[0001] The invention relates to an anti-deformation fixing device and a method thereof, in particular to an anti-deformation fixing device and a method thereof for heat treatment of a double-layer spiral coil, and belongs to the technical field of spiral coil fixing. Background Art

[0002] As an important component in the industrial field, the double-layer spiral coil stands out among many heat exchange equipment with its unique design and excellent performance. First of all, from the perspective of structural design, the double-layer spiral coil adopts an efficient spiral shape. This design not only allows the fluid to pass more smoothly when flowing in the tube, but also greatly improves the velocity gradient of the fluid, thereby enhancing the efficiency and effect of heat transfer. In addition, the compact structure of the spiral shape also reduces the space occupied by the pipeline, providing more flexibility for the overall layout of the equipment. Secondly, in terms of high temperature and high pressure resistance, the spiral coil material is usually made of high-strength alloy steel and other high-toughness materials. These materials have good heat resistance and pressure resistance, and can maintain stable performance and a long service life in extreme working environments. Therefore, there is no Whether under high temperature or high pressure conditions, spiral coils can reliably complete heat exchange tasks; furthermore, in terms of corrosion resistance, since the surface of the spiral coil has been specially treated, such as spraying anti-corrosion paint or using high-performance composite materials, it has excellent corrosion resistance, which means that the use of spiral coils in various corrosive environments can effectively avoid damage caused by chemical erosion, greatly extending the service life of the equipment; in addition, it is worth mentioning that spiral coils are also very convenient in installation and maintenance. Due to their simple structure and high degree of standardization, the installation process becomes fast and simple; and in daily use, regular inspections and maintenance work can also be completed quickly to ensure the stable operation of the equipment; therefore, double-layer spiral coils are becoming more and more popular, and the demand has greatly increased.

[0003] The existing double-layer spiral coil needs to go through a heat treatment process during production. The current fixing method used during heat treatment usually uses a single tube for fixing, which leads to the problem that the angle of the spiral tube is easy to change and the concentricity is easy to reduce during the heat treatment process.

[0004] At present, patent CN102734557B discloses a spiral coil fixing assembly and assembly method. The assembly mainly consists of an inner sleeve, an inner tube load-bearing bar, a load-bearing bar, a fixing bar, fixing screws and an outer sleeve. The inner spiral coil and the outer spiral coil are fixed by the load-bearing bar and the fixing bar respectively. The spiral coil is tightly fixed by fixing parts, which reduces the risk of flow-induced vibration. However, the fixing assembly is suitable for inner and outer spiral coils made of single tubes respectively, but not for double-layer spiral coils made of a single tube. At the same time, through holes are opened on the load-bearing bar and the fixing bar, which need to be fixed one by one with screws, making installation and disassembly inconvenient, and the concentricity accuracy of the fixing parts close to the outside of the spiral coil is insufficient.

[0005] Therefore, developing a fixing device and method for heat treatment of double-layer spiral coils that can overcome the above defects has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a double-layer spiral coil heat treatment anti-deformation fixing device and method. The device has a simple structure and is fixed by a combination of inner and outer double cylinders and angle disks. During the heat treatment process, the fixing effect is good, the spiral tube angle is not easy to change, the concentricity is good, and the fixing method is simple and easy.

[0007] In order to solve the above technical problems, the present invention provides a double-layer spiral coil heat treatment anti-deformation fixing device, comprising an inner tube, an outer tube, an angle plate, a double-layer spiral coil, a pitch spacer and a pressing block, the double-layer spiral coil is made of a tube and comprises an inner spiral coil and an outer spiral coil, the guide tubes of the inner spiral coil and the outer spiral coil are on the same side, the pitch spacer comprises a first pitch spacer and a second pitch spacer, the pressing block comprises a first pressing block and a second pressing block, and a pre-tightening member is provided on the angle plate; The double-layer spiral coil is sleeved outside the inner tube, so that the inner spiral coil is arranged on the outer surface of the inner tube, a plurality of first pitch spacers are evenly distributed outside the inner spiral coil to fix the spacing of each turn of the inner spiral coil, both ends of the first pitch spacers are fixedly arranged on the inner tube, the outer tube is sleeved outside the inner spiral coil, the outer tube is located between the inner spiral coil and the outer spiral coil, a plurality of second pitch spacers are evenly distributed outside the outer spiral coil to fix the spacing of each turn of the outer spiral coil, both ends of the second pitch spacers are fixedly arranged on the outer tube, an angle disk is provided on one side of the guide tube of the double-layer spiral coil, one end of the inner tube is bolted to the angle disk, the guide tube of the inner spiral coil is fixed to the inner tube by a first pressing block and inserted into the angle disk, the guide tube of the outer spiral coil is arranged in the preload member and is fastened by a second pressing block; The inner tube and the outer tube are connected to the angle plate through a guide tube of a double-layer spiral coil.

[0008] The technical solution further defined in the present invention is: Furthermore, in the aforementioned double-layer spiral coil heat treatment anti-deformation fixing device, an inner cylinder ring cover is provided at one end of the inner cylinder, and a plurality of first through holes are evenly distributed on the inner cylinder ring cover. An array of threaded holes is evenly distributed on the outer wall of the inner cylinder on one side of the inner spiral coil guide tube. Each group of four threaded holes is used for connecting the first pressure block, and second through holes are respectively provided at both ends of the outer wall of the inner cylinder for fixed connection of the two ends of the first pitch spacer.

[0009] Technical effect: The present invention provides a ring cover on the inner cylinder to facilitate connection and fixation with the angle disk, and at the same time, corresponding through holes and threaded holes are provided on the outer wall to fix the inner spiral coil and the first pitch spacer well, effectively preventing deformation of the double-layer spiral coil during heat treatment and ensuring stability and concentricity.

[0010] In the aforementioned double-layer spiral coil heat treatment anti-deformation fixing device, an outer cylinder ring cover is provided at one end of the outer cylinder, and a clamping groove is provided in the opening structure at the other end. Several inner ring through holes and outer ring through holes are evenly distributed on the outer cylinder ring cover along its annular structure. The inner ring through holes and the outer ring through holes respectively form a circle. The inner ring through holes are arranged in the outer ring through holes, and the inner ring through holes correspond to the first through holes on the inner cylinder. The outer ring through holes are used for the setting of the guide tube in the inner spiral coil. The outer wall of the outer cylinder is provided with a plurality of square grooves and a third through hole along its circumferential direction. The square grooves are hollowed out and arranged to correspond to the threaded holes on the inner cylinder to facilitate the installation of the nuts. The third through hole is used for the fixed connection of the second pitch spacer, and the clamping groove is arranged in the transition section between the inner spiral coil and the outer spiral coil.

[0011] Technical effect: The present invention provides an outer tube ring cover on one side of the outer tube for easy installation and disassembly with the angle disk, and a slot on one side. The double-layer spiral coil is made of one tube, and there is a transition section between the inner spiral coil and the outer spiral coil. There is no ring cover at the other end of the outer tube, and a slot is provided. The slot is located in the transition section to ensure that the sleeve installation is completed, and the slot is also convenient for installing the pitch spacer of the inner tube without affecting the locking of the outer spiral coil of the outer tube. An inner circle through hole is provided on the ring cover of the outer tube, corresponding to the first through hole on the inner tube, which is convenient for fixing with the angle disk, and the outer circle through hole is used to adapt to the assembly of inner spiral coil guide tubes of different specifications, with strong adaptability and improved stability. A square groove is provided on the outer tube, which is convenient for installing the first pitch spacer on the inner tube with a nut, and the nut can be tightened in the square groove, which is convenient for installation and disassembly.

[0012] In the aforementioned double-layer spiral coil heat treatment anti-deformation fixing device, the first pitch spacer and the second pitch spacer have the same structure, including a spacer body, one side of the spacer body used to fix the double-layer spiral coil is concave to form multiple grooves to adapt to the double-layer spiral coil, and long grooves are respectively provided at both ends of the spacer body, and bolts are provided in the long grooves.

[0013] Technical effect: The first pitch spacer and the second pitch spacer of the present invention are provided with matching grooves that can be used to fix the double-layer spiral coil to adjust the spacing. Long grooves are opened at both ends and are equipped with bolts to fine-tune the specific position of the spiral coil pitch, and the pitch spacers are fixed on the inner tube wall or the outer tube wall, making adjustment and installation and disassembly more convenient.

[0014] In the aforementioned double-layer spiral coil heat treatment anti-deformation fixing device, the angle disk is an annular flange plate, and a circle of inner ring fixing holes and a circle of outer ring fixing holes are evenly distributed on the flange plate. The inner ring fixing holes are arranged in the outer ring fixing holes, and the inner ring fixing holes correspond to the inner ring through holes on the outer tube and the first through holes on the inner tube, and the outer ring fixing holes correspond to the outer ring through holes on the outer tube. A preload is arranged on the side where the angle disk is connected to the outer tube. The cross-section of the preload is a T-shaped structure including a horizontal section and a vertical section. The horizontal section and the vertical section of the preload are respectively vertically arranged on the flange plate. A vertical section is arranged on one side of the horizontal section, and a groove is arranged on the other side for placing the guide tube of the outer spiral coil. A second pressure block is also arranged on the side where the groove is arranged in the horizontal section, and the second pressure block fixes the outer spiral coil in the groove.

[0015] Technical effect: The present invention arranges an angle disk to further fix the inner tube and the outer tube, improves stability and avoids deformation; a preload is arranged on the angle disk to fix the guide tube of the outer spiral coil; no additional holes are required on the angle disk; and the preload is fixed on the angle disk, which is convenient for fixing and disassembly; the cross-section of the preload is a T-shaped structure; the horizontal section and the vertical section are both vertically arranged on the angle disk; the base is wider and is not a single plate arrangement, which enhances stability; the guide tube is fixed in the groove and fastened by a second pressure block and bolts; this ensures that the angle of the spiral tube will not change during the heat treatment process.

[0016] In the aforementioned double-layer spiral coil heat treatment anti-deformation fixing device, the first pressure block includes a first pressure block body, the lower end of the first pressure block body is an arc-shaped structure adapted to the outer wall of the inner tube, the middle part of the lower end of the first pressure block body is concave to form a pressure block groove for pressing and tightening the guide tube, and circular holes are respectively provided at the four corners of the lower end of the first pressure block body for tightening the first pressure block body.

[0017] In the aforementioned double-layer spiral coil heat treatment anti-deformation fixing device, the second pressing block includes a second pressing block body with a square structure, the lower end of the pressing block body is concave to form a pressing block groove for pressing and tightening the guide tube, and circular holes are respectively provided at the four corners of the lower end of the second pressing block body for tightening the second pressing block body.

[0018] Technical effect: The present invention adopts a pressure block with a corresponding structure to compress and fix the guide tube on the inner spiral coil and the outer spiral coil. The lower end of the first pressure block is arc-shaped to facilitate contact and tightening with the inner tube. The second pressure block contacts the horizontal section of the preloaded part so there is no need for an arc, which further improves stability, facilitates installation and disassembly, and ensures that the angle of the spiral coil will not change.

[0019] In the aforementioned double-layer spiral coil heat treatment anti-deformation fixing device, the center of each guide tube in the inner spiral coil and the outer spiral coil is located on the same center line as the center of the double-layer spiral coil.

[0020] Technical effect, located on the same center line to ensure the concentricity of the spiral coil meets the requirements.

[0021] The present invention also provides a method for fixing a double-layer spiral coil heat treatment anti-deformation fixing device, which specifically includes the following steps: (1) Insert the inner tube into the inner spiral coil, set a first pitch spacer outside the inner spiral coil to fix the spacing of each turn of the inner spiral coil, and fix the two ends of the first pitch spacer to the outer wall of the inner tube by bolts; (2) inserting the outer tube into the middle of the double-layer spiral coil, the groove on the outer tube is set at the transition section between the inner spiral coil and the outer spiral coil, so that the outer spiral coil is set outside the outer tube, and a second pitch spacer is set outside the outer spiral coil to fix the spacing of each turn of the outer spiral coil, and the two ends of the second pitch spacer are fixed to the outer wall of the outer tube by bolts; (3) The angle disk is installed on the side of the double-layer spiral coil where the guide tube is provided. The openings of the angle disk, the inner tube and the outer tube correspond to each other. The ring fixing hole on the angle disk is connected with the first through hole on the inner tube by bolts. Then the guide tube in the inner spiral coil is extended into the outer ring fixing hole of the angle disk along the direction of the inner tube until it extends out of the angle disk. The guide tube in the inner spiral coil is fixed to the outer wall of the inner tube by the first pressing block. The guide tube in the outer spiral coil is placed in the preloaded part on the angle disk and fixed by the second pressing block and bolts.

[0022] The technical solution further defined in the present invention is: Furthermore, in the aforementioned method of fixing the double-layer spiral coil using a heat treatment anti-deformation fixing device, long grooves are respectively provided at both ends of the first pitch spacer and the second pitch spacer, and the position of the pitch spacer on the double-layer spiral coil is adjusted through the long grooves.

[0023] Technical effect: The present invention can be adjusted through the long grooves on the pitch spacers, and the specific positions of the pitches of the inner and outer spiral coils can be adjusted according to the radial changes in the pitch and the connection with the holes.

[0024] The beneficial effects of the present invention are: Due to the effect of the angle disk, the center of the spiral coil can always be symmetrical, and the spacing of the spiral coil is always guaranteed by the pitch spacers, thereby improving the work efficiency of the heat treatment process and reducing the collision and deformation of the spiral coil during the process.

[0025] The present invention fixes the pitch of the corresponding inner and outer spiral coils by the first pitch spacer and the second pitch spacer, ensuring that the angle of the spiral coil will not change during the heat treatment process and ensuring that the straight section of the spiral coil, i.e. the guide pipe, is always in the position requirement with the spiral coil.

[0026] The present invention fixes the spiral coil directly through the combination of inner and outer double tubes and the angle disk. The spacing is fixed through the integral pitch spacers. The fixing method is simple and easy. The pitch spacers and the double-layer spiral coil as well as the inner tube and the outer tube are all fixed on the angle disk. The stability is strong. During the heat treatment process, the fixing effect is good, the angle of the spiral tube is not easy to change, the concentricity is good, and the fixing method is simple and easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a double-layer spiral coil heat treatment anti-deformation fixing device according to an embodiment of the present invention; Figure 2 for Figure 1 The main view; Figure 3 for Figure 1 Left view of Figure 4 for Figure 1 Right view of; Figure 5 Figure 1 Schematic diagram of the structure of the middle inner tube; Figure 6 Figure 1 Schematic diagram of the structure of the middle and outer cylinders; Figure 7 Figure 1 Schematic diagram of the structure of the middle angle plate; Figure 8 for Figure 7 The main view; Fig. 9 for Figure 1 A schematic diagram of the structure of the first pitch spacer; Fig.10 for Fig. 9 A top view of Fig.11 Figure 1 A schematic diagram of the structure of the first pressing block; Fig.12 for Fig.11 Side view of Fig.13 for Fig.11 Bottom view of Fig.14 for Figure 1 A schematic diagram of the structure of the second pressing block; Fig.15 for Fig.14 Bottom view of Fig.16 for Figure 1 Schematic diagram of the structure of the double-layer spiral coil; Fig.17 It is a schematic diagram of the structure when the pitch of the double-layer spiral coil is fixed by the pitch spacer; In the figure: 1-inner cylinder, 11-inner cylinder ring cover, 12-first through hole, 13-threaded hole, 14-second through hole, 2-outer cylinder, 21-outer cylinder ring cover, 22-slot, 23-inner ring through hole, 24-outer ring through hole, 25-square groove, 26-third through hole, 3-angle plate, 31-inner ring fixing hole, 32-outer ring fixing hole, 4-double-layer spiral coil, 41-inner spiral coil, 42-outer Spiral coil, 43-guide tube, 5-pitch spacer, 51-first pitch spacer, 52-second pitch spacer, 53-spacer body, 54-groove, 55-long groove, 6-pressure block, 61-first pressure block, 611-first pressure block body, 62-second pressure block, 621-second pressure block body, 63-pressure block body, 64-pressure block groove, 7-preload, 71-horizontal section, 72-vertical section. DETAILED DESCRIPTION Example 1

[0028] This embodiment provides a double-layer spiral coil heat treatment anti-deformation fixing device, the structure of which is as follows Figure 1-2 As shown, it includes an inner tube 1, an outer tube 2, an angle plate 3, a double-layer spiral coil 4, a pitch spacer 5 and a pressing block 6. The double-layer spiral coil 4 is made of one tube and includes an inner spiral coil 41 and an outer spiral coil 42. The guide tubes 43 of the inner spiral coil 41 and the outer spiral coil 42 are on the same side. The pitch spacer 5 includes a first pitch spacer 51 and a second pitch spacer 52. The pressing block 6 includes a first pressing block 61 and a second pressing block 62. The angle plate 3 is provided with a preload 7. The double-layer spiral coil 4 is sleeved outside the inner tube 1, so that the inner spiral coil 41 is arranged on the outer surface of the inner tube 1, and a plurality of first pitch spacers 51 are evenly distributed outside the inner spiral coil 41 to fix the spacing of each turn of the inner spiral coil 41. Fig.17 As shown, both ends of the first pitch spacer 51 are fixed on the inner tube 1 by bolts, the outer tube 2 is sleeved outside the inner spiral coil 41, the outer tube 2 is located between the inner spiral coil 41 and the outer spiral coil 42, and a plurality of second pitch spacers 52 are evenly distributed outside the outer spiral coil 42 to fix the spacing of each circle of the outer spiral coil 42 as shown in FIG. Fig.17 As shown, both ends of the second pitch spacer 52 are fixedly arranged on the outer cylinder 2, an angle plate 3 is arranged on one side of the guide tube of the double-layer spiral coil 4, one end of the inner cylinder 1 is bolted to the angle plate 3, the guide tube of the inner spiral coil 41 is fixed to the inner cylinder 1 by the first pressing block 61 and inserted into the angle plate 3, and the guide tube of the outer spiral coil 42 is arranged in the preload 7 and fastened by the second pressing block 62; The inner tube 1 and the outer tube 2 are connected to the angle plate 3 through the guide tube 43 of the double-layer spiral coil 4.

[0029] In this embodiment, see Figure 5 An inner cylinder ring cover 11 is provided at one end of the inner cylinder 1, and more than three first through holes 12 are evenly distributed on the inner cylinder ring cover 11, and the first through holes correspond to the inner ring fixing holes on the angle disk. An array of threaded holes 13 are evenly distributed on the outer wall of the inner cylinder 1 on one side of the guide tube of the inner spiral coil 41, and each group consists of four threaded holes 13 for connecting the first pressure block 61. The threaded holes 13 are evenly distributed in more than three equal parts of the inner cylinder, and second through holes 14 are respectively provided at both ends of the outer wall of the inner cylinder 1 for fixed connection of the two ends of the first pitch spacer 51, and the second through holes divide the inner cylinder into more than three equal parts.

[0030] In this embodiment, see Figure 6 An outer cylinder ring cover 21 is provided at one end of the outer cylinder 2, and a clamping groove 22 is provided in the opening structure at the other end. Several ∅9mm inner ring through holes 23 and ∅20mm outer ring through holes 24 are evenly distributed on the outer cylinder ring cover 21 along its annular structure. The inner ring through holes 23 and the outer ring through holes 24 respectively form a circle. The inner ring through holes 23 are arranged in the outer ring through holes 24. The inner ring through holes 23 correspond to the first through holes 12 on the inner cylinder 1. The outer ring through holes 24 are used for the arrangement of the guide tube in the inner spiral coil 41. The outer wall of the outer cylinder 2 is provided with a plurality of square grooves 25 and a third through hole 26 along its circumferential direction. The square grooves and the threaded holes are located on the same center line and are equally divided into more than 3 parts around the outer cylinder. The square grooves 25 are hollowed out to correspond to the threaded holes 13 on the inner cylinder 1 to facilitate the installation of the nut. The third through holes 26 are used for the fixed connection of the second pitch spacer 52. The clamping groove 22 is arranged in the transition section between the inner spiral coil 41 and the outer spiral coil 42.

[0031] In this embodiment, see Figure 9-10 The first pitch spacer 51 and the second pitch spacer 52 have the same structure, including a spacer body 53. One side of the spacer body 53 for fixing the double-layer spiral coil 4 is concave to form a plurality of grooves 54 that are adapted to the double-layer spiral coil 4 for fixing the spiral coil. Long grooves 55 are respectively provided at both ends of the spacer body 53, and bolts are provided in the long grooves 55.

[0032] In this embodiment, see Figure 7-8The angle disk 3 is an annular flange plate, and a circle of inner ring fixing holes 31 and a circle of outer ring fixing holes 32 are evenly distributed on the flange plate. The inner ring fixing holes 31 are arranged in the outer ring fixing holes 32. The inner ring fixing holes 31 correspond to the inner ring through holes 23 on the outer tube 2 and the first through holes 12 on the inner tube 1, and the outer ring fixing holes 32 correspond to the outer ring through holes 24 on the outer tube 2. A preload member 7 is arranged on one side of the angle disk 3 connected to the outer tube 2. The cross section of the preload member 7 is a T-shaped structure including a horizontal section 71 and a vertical section 72. The horizontal section 71 and the vertical section 72 of the preload member 7 are respectively vertically arranged on the flange plate. A vertical section 72 is arranged on one side of the horizontal section 71, and a groove is arranged on the other side for placing a guide tube of the outer spiral coil 42. A second pressing block 62 is also arranged on the side of the horizontal section 71 where the groove is arranged. The second pressing block 62 fixes the outer spiral coil 42 in the groove.

[0033] In this embodiment, see Figure 11-13 The first pressing block 61 includes a first pressing block body 611. The lower end of the first pressing block body 611 is an arc-shaped structure adapted to the outer wall of the inner tube. The middle part of the lower end of the first pressing block body 611 is concave to form a pressing block groove for pressing and tightening the guide tube. Circular holes are respectively provided at the four corners of the lower end of the first pressing block body 611 for tightening the first pressing block body 611.

[0034] In this embodiment, see Figure 14-15 The second pressing block 62 includes a second pressing block body 621 of a cubic structure. The lower end of the second pressing block body 621 is concave to form a pressing block groove for pressing and fastening the guide tube. The four corners of the lower end of the second pressing block body 621 are respectively provided with circular holes for fastening the second pressing block body 621.

[0035] In this embodiment, see Fig.16 The center of each guide tube in the inner layer spiral coil 41 and the outer layer spiral coil 42 is located on the same center line as the center of the double layer spiral coil 4 .

[0036] This embodiment also provides a method for fixing the above-mentioned double-layer spiral coil heat treatment anti-deformation fixing device, which specifically includes the following steps: (1) Insert the inner tube into the inner spiral coil, set a first pitch spacer outside the inner spiral coil to fix the spacing of each turn of the inner spiral coil, and fix the two ends of the first pitch spacer to the outer wall of the inner tube by bolts; In step (1), long grooves are provided at both ends of the first pitch spacer to adjust the specific position of the pitch of the inner spiral coil as needed, and the axial position of the inner spiral coil and the inner cylinder can be slightly moved; (2) inserting the outer tube into the middle of the double-layer spiral coil, the groove on the outer tube is set at the transition section between the inner spiral coil and the outer spiral coil, so that the outer spiral coil is set outside the outer tube, and a second pitch spacer is set outside the outer spiral coil to fix the spacing of each turn of the outer spiral coil, and the two ends of the second pitch spacer are fixed to the outer wall of the outer tube by bolts; Long grooves are provided at both ends of the second pitch spacer to adjust the specific position of the pitch of the outer spiral coil as needed, and the axial position of the outer spiral coil and the outer cylinder can be slightly moved; (3) The angle disk is installed on the side of the double-layer spiral coil where the guide tube is provided. The openings of the angle disk, the inner tube and the outer tube correspond to each other. The ring fixing hole on the angle disk is connected with the first through hole on the inner tube by bolts. Then the guide tube in the inner spiral coil is extended into the outer ring fixing hole of the angle disk along the direction of the inner tube until it extends out of the angle disk. The guide tube in the inner spiral coil is fixed to the outer wall of the inner tube by the first pressing block. The guide tube in the outer spiral coil is placed in the preloaded part on the angle disk and fixed by the second pressing block and bolts.

[0037] The present invention combines an inner and outer double tube + an angle disk in a mutually nested manner to form a fixing device; a pitch spacer has a C-shaped groove to lock the pitch of the spiral tube; the angle disk and the inner and outer tubes are fixed by flange bolts to ensure the concentricity of the double-layer spiral tube and the angle of the straight tube at the starting bend section and the straight tube at the ending bend section, thereby effectively preventing deformation during heat treatment.

[0038] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A double-layer spiral coil heat treatment anti-deformation fixing device, characterized in that: The invention comprises an inner tube (1), an outer tube (2), an angle plate (3), a double-layer spiral coil (4), a pitch spacer (5) and a pressing block (6); the double-layer spiral coil (4) is made of a tube and comprises an inner spiral coil (41) and an outer spiral coil (42); the guide tubes (43) of the inner spiral coil (41) and the outer spiral coil (42) are on the same side; the pitch spacer (5) comprises a first pitch spacer (51) and a second pitch spacer (52); the pressing block (6) comprises a first pressing block (61) and a second pressing block (62); and a pre-tightening member (7) is provided on the angle plate (3); The double-layer spiral coil (4) is sleeved outside the inner tube (1), so that the inner spiral coil (41) is arranged on the outer surface of the inner tube (1), and a plurality of the first pitch spacers (51) are evenly distributed outside the inner spiral coil (41) to fix the spacing of each turn of the inner spiral coil (41), and both ends of the first pitch spacers (51) are fixedly arranged on the inner tube (1), and the outer tube (2) is sleeved outside the inner spiral coil (41), and the outer tube (2) is located between the inner spiral coil (41) and the outer spiral coil (42), and a plurality of the second pitch spacers (51) are evenly distributed outside the outer spiral coil (42). The pitch spacer (52) fixes the spacing of each turn of the outer spiral coil (42), the two ends of the second pitch spacer (52) are fixedly arranged on the outer cylinder (2), the angle disk (3) is arranged on one side of the guide tube of the double-layer spiral coil (4), one end of the inner cylinder (1) is bolted to the angle disk (3), the guide tube of the inner spiral coil (41) is fixed to the inner cylinder (1) by the first pressing block (61) and inserted into the angle disk (3), and the guide tube of the outer spiral coil (42) is arranged in the pre-tightening member (7) and is fastened by the second pressing block (62); The inner cylinder (1) and the outer cylinder (2) are connected to the angle disk (3) via a guide tube (43) of a double-layer spiral coil (4).

2. The double-layer spiral coil heat treatment anti-deformation fixing device according to claim 1 is characterized in that: An inner tube ring cover (11) is provided at one end of the inner tube (1), and a plurality of first through holes (12) are evenly distributed on the inner tube ring cover (11). An array of threaded holes (13) are evenly distributed on the outer wall of the inner tube (1) on one side of the guide tube of the inner spiral coil (41), and each group of four threaded holes (13) is used for connecting the first pressing block (61). Second through holes (14) are respectively provided at both ends of the outer wall of the inner tube (1) for fixed connection of the two ends of the first pitch spacer (51).

3. The double-layer spiral coil heat treatment anti-deformation fixing device according to claim 2 is characterized in that: An outer cylinder ring cover (21) is provided at one end of the outer cylinder (2), and a clamping groove (22) is provided in an opening structure at the other end. A plurality of inner ring through holes (23) and outer ring through holes (24) are evenly distributed along the annular structure of the outer cylinder ring cover (21). The inner ring through holes (23) and the outer ring through holes (24) respectively form a circle. The inner ring through holes (23) are arranged in the outer ring through holes (24). The inner ring through holes (23) correspond to the first through holes (12) on the inner cylinder (1). The outer ring through holes (24) are (24) is used for setting the guide tube in the inner spiral coil (41), the outer wall of the outer tube (2) is provided with a plurality of square grooves (25) and a third through hole (26) along its circumferential direction, the square grooves (25) are hollowed out to correspond to the threaded holes (13) on the inner tube (1) to facilitate the installation of the nut, the third through hole (26) is used for the fixed connection of the second pitch spacer (52), and the slot (22) is provided in the transition section between the inner spiral coil (41) and the outer spiral coil (42).

4. The double-layer spiral coil heat treatment anti-deformation fixing device according to claim 1 is characterized in that: The first pitch spacer (51) and the second pitch spacer (52) have the same structure, and include a spacer body (53). One side of the spacer body (53) used for fixing the double-layer spiral coil (4) is concave to form a plurality of grooves (54) adapted to the double-layer spiral coil (4). Long grooves (55) are respectively provided at both ends of the spacer body (53), and bolts are provided in the long grooves (55).

5. The double-layer spiral coil heat treatment anti-deformation fixing device according to claim 3 is characterized in that: The angle plate (3) is an annular flange plate, on which a circle of inner ring fixing holes (31) and a circle of outer ring fixing holes (32) are evenly distributed, the inner ring fixing holes (31) are arranged in the outer ring fixing holes (32), the inner ring fixing holes (31) correspond to the inner ring through holes (23) on the outer cylinder (2) and the first through holes (12) on the inner cylinder (1), and the outer ring fixing holes (32) correspond to the outer ring through holes (24) on the outer cylinder (2), and a preload member (7) is arranged on one side of the angle plate (3) connected to the outer cylinder (2). The cross section of the preload member (7) is a T-shaped structure comprising a horizontal section (71) and a vertical section (72). The horizontal section (71) and the vertical section (72) of the preload member (7) are respectively arranged vertically on the flange plate. The vertical section (72) is arranged on one side of the horizontal section (71), and a groove is arranged on the other side for accommodating a guide tube of the outer spiral coil (42). A second pressing block (62) is also arranged on the side of the horizontal section (71) where the groove is arranged. The second pressing block (62) fixes the outer spiral coil (42) in the groove.

6. The double-layer spiral coil heat treatment anti-deformation fixing device according to claim 1 is characterized in that: The first pressing block (61) comprises a first pressing block body (611); the lower end of the first pressing block body (611) is an arc-shaped structure adapted to the outer wall of the inner tube (1); the middle portion of the lower end of the first pressing block body (611) is concave to form a pressing block groove for pressing and fastening the guide tube; and circular holes are respectively provided at the four corners of the lower end of the first pressing block body (611) for fastening the first pressing block body (611).

7. The double-layer spiral coil heat treatment anti-deformation fixing device according to claim 1 is characterized in that: The second pressing block (62) comprises a second pressing block body (621) of a cubic structure, the lower end of the second pressing block body (621) being concave to form a pressing block groove for pressing and fastening the guide tube, and four corners of the lower end of the second pressing block body (621) being respectively provided with circular holes for fastening the second pressing block body (621).

8. The double-layer spiral coil heat treatment anti-deformation fixing device according to claim 1 is characterized in that: The center of each guide tube in the inner spiral coil (41) and the outer spiral coil (42) is located on the same center line as the center of the double-layer spiral coil (4).

9. A method for fixing a double-layer spiral coil by using the heat treatment anti-deformation fixing device according to any one of claims 1 to 8, characterized in that: The specific steps include: (1) Insert the inner tube into the inner spiral coil, set a first pitch spacer outside the inner spiral coil to fix the spacing of each turn of the inner spiral coil, and fix the two ends of the first pitch spacer to the outer wall of the inner tube by bolts; (2) inserting the outer tube into the middle of the double-layer spiral coil, the groove on the outer tube is set at the transition section between the inner spiral coil and the outer spiral coil, so that the outer spiral coil sleeve is set outside the outer tube, and a second pitch spacer is set outside the outer spiral coil to fix the spacing of each turn of the outer spiral coil, and the two ends of the second pitch spacer are fixed to the outer wall of the outer tube by bolts; (3) The angle disk is installed on the side of the double-layer spiral coil where the guide tube is provided. The openings of the angle disk, the inner tube and the outer tube correspond to each other. The ring fixing hole on the angle disk is connected with the first through hole on the inner tube by bolts. Then the guide tube in the inner spiral coil is extended into the outer ring fixing hole of the angle disk along the direction of the inner tube until it extends out of the angle disk. The guide tube in the inner spiral coil is fixed to the outer wall of the inner tube by the first pressing block. The guide tube in the outer spiral coil is placed in the preloaded part on the angle disk and fixed by the second pressing block and bolts.

10. The method for fixing using the double-layer spiral coil heat treatment anti-deformation fixing device according to claim 9, characterized in that: Long grooves are respectively provided at both ends of the first pitch spacer (51) and the second pitch spacer (52), and the position of the pitch spacer (5) on the double-layer spiral coil (4) is adjusted through the long grooves.

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