An anti-vibration arched arc gasket for a spiral wound heat exchanger

Abstract

The present invention discloses an anti-vibration arched arc-shaped gasket strip for a spiral wound heat exchanger, belonging to the technical field of chemical heat exchange equipment. It includes a central cylinder, and a plurality of space limiting support plates are arranged on the outer wall of the central cylinder. The mutually adjacent surfaces of two adjacent space limiting support plates overlap with each other. An arched arc-shaped gasket strip is arranged on the upper surface of the space limiting support plate, and a heat exchange tube is wound around the outer surface of the central cylinder. By setting the space limiting support plates, the arched arc-shaped gasket strip and the heat exchange tube, the arc surface design of the arched arc-shaped gasket strip greatly reduces the wear of the traditional space limiting gasket strip on the heat exchange tube during the manufacturing process. At the same time, the arched arc-shaped gasket strip is stamped on the reverse side of the space limiting support plate, and its processing surface does not contact the surface of the heat exchange tube. The contact surface between the arched arc-shaped gasket strip and the heat exchange tube is relatively large, so that the cutting shear force of the contact end surface is greatly reduced, and it is not easy to cause friction cutting on the heat exchange tube, greatly increasing the service life of the heat exchange tube.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical heat exchange equipment, and in particular relates to a vibration-resistant arched curved surface gasket for a coiled tube heat exchanger. Background Art

[0002] The wound tube heat exchanger is a heat exchanger with a high efficiency and compact structure. With the large-scale installation, the wound tube heat exchanger is gradually adopted by petrochemical and other processes due to its small heat loss, small volume, compact structure, large heat transfer area, and high heat exchange efficiency. The wound tube heat exchanger is mainly composed of a shell and a tube bundle. The tube bundle is mainly composed of heat exchange tubes, tube sheets, a center tube, gaskets and clamps. The heat exchange tubes are tightly staggered and coiled on the center tube, separated by flat gaskets and special-shaped gaskets to ensure the horizontal and vertical spacing between the tubes.

[0003] The movement of the fluid in the wound tube heat exchanger is very complex. The staggered arrangement of the gaskets and the heat exchange tubes will form a strong turbulence effect on the shell side medium, which can make the shell side medium reach the turbulent effect at a lower Reynolds number. The flow rate and direction of the fluid are constantly changing irregularly, so that the heat exchange tube is in an uneven force field and is affected by various excitation forces of the fluid flow, which is very easy to vibrate. When the frequency of the flow-induced vibration is close to the natural frequency of the heat exchange tube, the heat exchange tube will vibrate strongly, causing damage to the heat exchange tube. Flow-induced vibration will cause additional pressure loss, noise and damage to the heat transfer elements of the heat exchanger. So far, there have been many examples of large heat exchangers at home and abroad being damaged by vibration. The degree of damage is very alarming and has attracted widespread attention from countries around the world. At present, the problem of flow-induced vibration of the heat exchanger tube bundle has become one of the key issues that heat exchanger designers need to consider.

[0004] The core structure of the wound tube heat exchanger is a space limiting gasket, which has two main functions. One is to ensure the uniformity of the arrangement of the heat exchange tubes by limiting the spatial position of the heat exchange tubes, and prevent the fluid from flowing sideways in the heat exchanger to ensure the process performance of the heat exchanger; the other is to increase the natural frequency of the heat exchange tubes by constraining the displacement of the heat exchange tubes, thereby playing an anti-vibration role.

[0005] The traditional space limiting gasket is an L-shaped serrated gasket. Since the serrated gasket is an integrated structure, the length of the serrated gasket cannot be adjusted, and the positions of multiple limiting gaskets on the serrated gasket cannot be changed. When it is necessary to limit heat exchange tubes of different specifications, serrated gaskets of different specifications and sizes need to be replaced, which increases the cost of use and cannot meet the use of heat exchange tubes of different specifications, making it less applicable.

[0006] The traditional spatial limit gasket strip is an L-shaped serrated gasket strip. Although it can increase the natural frequency of the heat exchange tube, when there is fluid-induced vibration or displacement change due to thermal expansion and contraction, since the processing surface directly contacts the outer wall of the heat exchange tube, the serrated tooth surface will cut the heat exchange tube, causing the heat exchange tube to rupture. For heat exchangers, the buffeting caused by air flow and thermal expansion and contraction are very common. Therefore, the traditional L-shaped serrated gasket strip is very likely to cause damage to the heat exchange tube, thus greatly reducing the service life of the heat exchange tube. Summary of the Invention

[0007] (1) Technical problems to be solved

[0008] To overcome the above defects of the prior art, the present invention provides an anti-vibration arched arc gasket strip for a wound tube heat exchanger, solving the problem that the traditional spatial limit gasket strip is an L-shaped serrated gasket strip. When there is fluid-induced vibration or displacement change due to thermal expansion and contraction, since the processing surface directly contacts the outer wall of the heat exchange tube, the serrated tooth surface will cut the heat exchange tube, causing the heat exchange tube to rupture and reducing the service life of the heat exchange tube.

[0009] (2) Technical solutions

[0010] To achieve the above object, the present invention provides the following technical solutions: An anti-vibration arched arc gasket strip for a wound tube heat exchanger, including a central cylinder. A plurality of spatial limit support plates are arranged on the outer wall of the central cylinder. The mutually close surfaces of adjacent two spatial limit support plates overlap each other. An arched arc gasket strip is arranged on the upper surface of the spatial limit support plate. The outer surface of the central cylinder is wound with a heat exchange tube. The heat exchange tube is wound between adjacent two arched arc gasket strips. The mutually close surfaces of corresponding two arched arc gasket strips overlap with the outer wall of the heat exchange tube. Two sliding grooves are opened on the right side surface of the spatial limit support plate on one side.

[0011] A slide rail is opened on the lower surface of the inner wall of the sliding groove. The same slide plate is slidably connected in the slide rail and the sliding groove. The right side surfaces of the two slide plates are fixedly connected to the left side surface of the spatial limit support plate on the other side. A plurality of spatial limit support plates are connected to form a single spatial limit gasket strip.

[0012] As a further solution of the present invention: The heat exchange tubes are closely and staggeredly wound on the central cylinder to ensure the horizontal and vertical distances between the wound heat exchange tubes. The arched arc gasket strip is obliquely arranged above the spatial limit support plate. A plurality of arched arc gasket strips are arranged in parallel. The mutually close surfaces of adjacent two arched arc gasket strips are externally tangent to the outer arc surface of the heat exchange tube.

[0013] As a further solution of the present invention: The shape of the arched arc gasket strip is set as "Ω", and the outer wall is designed as an arc surface.

[0014] As a further solution of the present invention: a threaded hole is provided on the upper surface of the space limiting support plate corresponding to the position of the front sliding plate, a fastening screw rod is threadedly connected in the threaded hole, the bottom end of the fastening screw rod is lapped with the upper surface of the sliding plate, an anti-slip pattern is provided on the upper surface of the sliding plate, and the shape of the sliding plate is set to be "L" shaped.

[0015] As a further solution of the present invention: the manufacturing steps of the arched arc surface cushion strip and the space limiting cushion strip are as follows:

[0016] A. First, unfold the steel plate, calculate the blanking force according to the perimeter of the unfolded blank, and select a suitable stamping equipment according to the blanking force.

[0017] B. Cut the pre-prepared steel plate into a plurality of strip plates with the same specifications through cutting, and perform chamfering processing on the processed parts of the strip plates.

[0018] C. Secondly, heat-treat the steel plate, the heating temperature is 700-750 °C, after heating, cool the steel plate to 300-350 °C, and then an aluminum-zinc coating can be plated on the surface of the steel plate, and the solid solution formed between the coating material and the steel plate is used to protect the strip metal from oxidation.

[0019] D. Put the steel plate into the heating furnace for complete austenitization, then put it into the pre-prepared mold, and the austenitization time is 6-10 min. Secondly, stamp and form the steel plate through the stamping equipment and keep the pressure for 10-12 s, then the stamping and forming of the strip can be completed, and the space limiting cushion strip and the stamped and formed arched arc surface cushion strip can be obtained.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. In the present invention, by setting the space limiting support plate, the arched arc surface cushion strip and the heat exchange tube, the space limiting cushion strip composed of a plurality of space limiting support plates is installed on the outer wall of the central cylinder, and the heat exchange tubes are closely wound around the central cylinder in a staggered manner, so that the heat exchange tubes are externally tangent to the outer arc surfaces of the adjacent two arched arc surface cushion strips. Since the heat exchange tubes need to be rotated on the arched arc surface cushion strips multiple times when being tightened, under the action of the self-gravity of the heat exchange tubes, mutual extrusion will be formed between the heat exchange tubes and the arched arc surface cushion strips. The arc surface design of the arched arc surface cushion strip greatly reduces the wear of the traditional space limiting cushion strip on the heat exchange tubes during the manufacturing process. At the same time, the arched arc surface cushion strip is stamped on the reverse side of the space limiting support plate, and its processing surface does not contact the surface of the heat exchange tube. The contact surface between the arched arc surface cushion strip and the heat exchange tube is large, so that the cutting shear force of the contact end surface is greatly reduced, and it is not easy to generate frictional cutting on the heat exchange tubes, greatly increasing the service life of the heat exchange tubes.

[0023] 2. In the present invention, the end face of the arched arc-shaped gasket strip is in the shape of "Ω". During the medium flow process, the medium can flow away from the middle channel of the Ω surface, which is not easy to form a flow dead zone, improving the heat transfer performance of the heat exchange tube and reducing the risk of fouling. When adjusting the positions of multiple space-limiting support plates, a tool needs to be used to turn the fastening screw. When the fastening screw disengages from the sliding plate, the space-limiting support plate can be pulled to adjust it to a suitable position and then the fastening screw can be tightened to complete the limitation of the space-limiting support plate. By adjusting the positions of multiple space-limiting support plates, the distance between two adjacent arched arc-shaped gasket strips can be changed, which can meet the use of heat exchange tubes of different specifications, reduce the use cost and enhance its applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural view of the front view of the present invention;

[0025] Figure 2 is a schematic sectional structural view of the three-dimensional space-limiting support plate of the present invention;

[0026] Figure 3 is an enlarged schematic structural view of the space-limiting support plate of the present invention;

[0027] Figure 4 is a schematic sectional structural view of the top view of the space-limiting support plate of the present invention;

[0028] In the figure: 1 central cylinder, 2 space-limiting support plate, 3 arched arc-shaped gasket strip, 4 heat exchange tube, 5 fastening screw, 6 slideway, 7 sliding plate, 8 slide rail, 9 threaded hole. DETAILED DESCRIPTION OF THE INVENTION

[0029] The technical solution of this patent will be further described in detail below in conjunction with the specific embodiments.

[0030] As Figures 1-4 shown, the present invention provides a technical solution: an anti-vibration arched arc-shaped gasket strip for a wound tube heat exchanger, including a central cylinder 1. A plurality of space-limiting support plates 2 are arranged on the outer wall of the central cylinder 1. The mutually close surfaces of two adjacent space-limiting support plates 2 overlap each other. An arched arc-shaped gasket strip 3 is arranged on the upper surface of the space-limiting support plate 2. The heat exchange tube 4 is wound around the outer surface of the central cylinder 1, and the heat exchange tube 4 is wound between two adjacent arched arc-shaped gasket strips 3. The mutually close surfaces of the corresponding two arched arc-shaped gasket strips 3 overlap with the outer wall of the heat exchange tube 4. Two slideways 6 are opened on the right side surface of the space-limiting support plate 2 on one side.

[0031] The lower surface of the inner wall of the slideway 6 is provided with a slide rail 8. A same slide plate 7 is slidably connected in the slide rail 8 and the slideway 6. The right side surfaces of the two slide plates 7 are fixedly connected to the left side surface of the space limiting support plate 2 on the other side. A plurality of space limiting support plates 2 are connected to form a single space limiting gasket strip. By arranging the space limiting support plate 2, the distance between two adjacent arched arc surface gasket strips 3 can be changed by adjusting the positions of the plurality of space limiting support plates 2, so as to meet the use of heat exchange tubes 4 of different specifications and sizes.

[0032] Specifically, as Figure 1 and 3 shown, the heat exchange tubes 4 are closely and staggeredly wound around the central cylinder 1 to ensure the horizontal and vertical distances between the wound heat exchange tubes 4. The arched arc surface gasket strip 3 is obliquely arranged above the space limiting support plate 2. Due to the presence of the arched arc surface gasket strip 3, the arched arc surface gasket strip 3 is stamped on the reverse side of the space limiting support plate 2, and its processing surface does not contact the surface of the heat exchange tube 4. The contact surface between the arched arc surface gasket strip 3 and the heat exchange tube 4 is large, so that the cutting shear force of the contact end face is greatly reduced. A plurality of arched arc surface gasket strips 3 are arranged in parallel. The outer arcs of two adjacent arched arc surface gasket strips 3 are externally tangent to the outer arc surface of the heat exchange tube 4. The shape of the arched arc surface gasket strip 3 is set as "Ω", and the outer wall is arc-shaped. The end face of the arched arc surface gasket strip 3 is "Ω" shaped. During the flow of the medium, it can flow away from the middle channel of the Ω surface, and it is not easy to form a flow dead zone, improving the heat transfer performance of the heat exchange tube 4 and not easily increasing the risk of fouling. Due to the arc-shaped design of the arched arc surface gasket strip 3, the arc-shaped design of the arched arc surface gasket strip 3 greatly reduces the wear of the traditional space limiting gasket strip on the heat exchange tube 4 during the manufacturing process.

[0033] Specifically, as Figure 2 and 3 shown, threaded holes 9 are opened on the upper surface of the space limiting support plate 2 corresponding to the positions of the front slide plates 7. Threaded connection bolts 5 are threadedly connected in the threaded holes 9. The bottom ends of the threaded connection bolts 5 are lapped on the upper surface of the slide plates 7. Anti-slip lines are arranged on the upper surface of the slide plates 7. Through the mutual cooperation between the threaded connection bolts 5 and the anti-slip lines, when the threaded connection bolts 5 are rotated, when the threaded connection bolts 5 are separated from the slide plates 7, the space limiting support plate 2 can be pulled, and after adjusting the space limiting support plate 2 to a suitable position, the threaded connection bolts 5 are tightened again to more stably fix and limit the space limiting support plate 2. The shape of the slide plate 7 is set as "L". Due to the setting of the L-shaped slide plate 7, the slide plate 7 can effectively limit the stroke of the space limiting support plate 2 and prevent the separation of a plurality of space limiting support plates 2.

[0034] The manufacturing steps of the arched arc surface gasket strip 3 and the space limiting gasket strip are as follows:

[0035] A. First, unfold the steel plate, calculate the blanking force according to the perimeter of the unfolded blank, and select a suitable stamping equipment according to the blanking force.

[0036] B. Cut the pre-prepared steel plate into a plurality of slats with the same specifications through cutting, and perform chamfering processing on the processed parts of the slats.

[0037] C. Next, heat-treat the steel plate at a temperature of 700 - 750 °C. After heating, cool the steel plate to 300 - 350 °C, and then an aluminum-zinc coating can be plated on the surface of the steel plate. The solid solution formed between the coating material and the steel plate is used to protect the slat metal from oxidation.

[0038] D. Place the steel plate in a heating furnace for complete austenitization, and then place it in a pre-prepared mold. The austenitization time is 6 - 10 min. Next, use a stamping device to stamp and form the steel plate, and keep the pressure for 10 - 12 s to complete the stamping and forming of the slats, and obtain the space limit cushion strip and the arched arc cushion strip 3 formed by stamping.

[0039] The working principle of the present invention is as follows:

[0040] During use, when it is necessary to adjust the positions of a plurality of space limit support plates 2, it is necessary to use a tool to turn the fastening screw 5. When the fastening screw 5 disengages from the sliding plate 7, the space limit support plate 2 can be pulled to adjust the space limit support plate 2 to a suitable position, and then the fastening screw 5 is tightened to limit the space limit support plate 2 so that the space limit support plate 2 no longer moves, and the distance between a plurality of arched arc cushion strips 3 can be adjusted. Next, install the space limit cushion strip composed of a plurality of space limit support plates 2 on the outer wall of the central cylinder 1, and then closely wind the heat exchange tubes 4 around the central cylinder 1 in a staggered manner, so that the heat exchange tubes 4 are externally tangent to the outer arc surfaces of the adjacent two arched arc cushion strips 3 and the heat exchange tubes 4, so that the heat exchange tubes 4 can rotate between a plurality of arched arc cushion strips 3.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0042] The above has made a detailed description of the preferred embodiments of the present patent, but the present patent is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present patent.

Claims

1. An anti-vibration arched arc-shaped gasket strip for a spiral wound heat exchanger, comprising a central cylinder (1), characterized in that: On the outer wall of the central cylinder (1), a number of spatial limiting support plates (2) are provided. The mutually approaching surfaces of two adjacent spatial limiting support plates (2) overlap each other. On the upper surface of the spatial limiting support plate (2), an arched arc-shaped cushion strip (3) is provided. On the outer surface of the central cylinder (1), a heat exchange tube (4) is wound. The heat exchange tube (4) is wound between two adjacent arched arc-shaped cushion strips (3). The mutually approaching surfaces of the corresponding two arched arc-shaped cushion strips (3) overlap with the outer wall of the heat exchange tube (4). On the right side surface of the spatial limiting support plate (2) on one side, two slideways (6) are provided; On the lower surface of the inner wall of the slideway (6), a slide rail (8) is provided. In the slide rail (8) and the slideway (6), the same slide plate (7) is slidably connected. The right side surfaces of the two slide plates (7) are fixedly connected to the left side surface of the spatial limiting support plate (2) on the other side. A number of spatial limiting support plates (2) are connected to form a single spatial limiting cushion strip; The heat exchange tube (4) is closely and staggeredly wound on the central cylinder (1) to ensure the horizontal and vertical spacings between the wound parts of the heat exchange tubes (4). The arched arc-shaped cushion strip (3) is obliquely arranged above the spatial limiting support plate (2). A number of arched arc-shaped cushion strips (3) are arranged in parallel. The outer arc surfaces of two adjacent arched arc-shaped cushion strips (3) are externally tangent to the outer arc surface of the heat exchange tube (4); The shape of the arched arc-shaped cushion strip (3) is set to "Ω", and the outer wall is designed as an arc surface. On the upper surface of the spatial limiting support plate (2) corresponding to the position of the front slide plate (7), a threaded hole (9) is provided. A fastening screw (5) is threadedly connected in the threaded hole (9). The bottom end of the fastening screw (5) overlaps with the upper surface of the slide plate (7). The upper surface of the slide plate (7) is provided with anti-slip lines. The shape of the slide plate (7) is set to an "L" shape.

2. The anti-vibration arched arc-shaped gasket strip for a spiral wound heat exchanger according to claim 1, characterized in that: The manufacturing steps of the arched arc-shaped cushion strip (3) and the spatial limiting cushion strip are as follows: A. First, unfold the steel plate, calculate the blanking force according to the circumference of the unfolded blank, and select a suitable stamping device according to the blanking force; B. Cut the pre-prepared steel plate into a number of strip plates with the same specifications, and perform chamfering processing on the processed parts of the strip plates; C. Secondly, heat-treat the steel plate. The heating temperature is 700 - 750 °C. After heating, cool the steel plate to 300 - 350 °C, and then coat the surface of the steel plate with an aluminum-zinc coating. Use the solid solution formed between the coating material and the steel plate to protect the strip metal from oxidation; D. Put the steel plate into a heating furnace for complete austenitization, and then put it into a pre-prepared mold. The austenitization time is 6 - 10 min. Secondly, use a stamping device to stamp the steel plate into shape and keep the pressure for 10 - 12 s, then the stamping forming of the strip plate can be completed, and the spatial limiting cushion strip and the stamped and formed arched arc-shaped cushion strip (3) are obtained.

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