Coiled tube heat exchanger filler strip and combined structure thereof

Abstract

The invention discloses a coiled tube heat exchanger filler strip and a combined structure thereof, and belongs to the technical field of heat exchangers, the coiled tube heat exchanger filler strip comprises a base plate, a plurality of limiting teeth are arranged on one side of the base plate in the length direction of the base plate, and a positioning groove for positioning a heat exchange tube is formed between every two adjacent limiting teeth; a plurality of heat exchange tubes are arranged in the positioning grooves, limiting teeth are arranged in the positioning grooves, circulation spaces are arranged between the roots of the limiting teeth and the heat exchange tubes, the circulation spaces are located at two included angle positions in the positioning grooves, the coiled tube heat exchanger filler strip combined structure comprises the coiled tube heat exchanger filler strips, and the adjacent coiled tube heat exchanger filler strips are overlapped so that the heat exchange tubes can be sealed in the positioning grooves. By means of the structure, positioning of the heat exchange tubes can be guaranteed, the heat exchange tubes are not prone to being damaged, pressure drop is small, and thermal expansion strain is timely. In addition, the combined structure is convenient to weld, and the heat exchange tubes are not prone to being damaged by the welding positions.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a gasket strip of a coiled tube heat exchanger and a combined structure thereof. Background Art

[0002] With the promotion and application of coiled heat exchangers in the chemical industry and other fields, their application conditions have become more complicated, and the quality and use requirements of heat exchangers have become higher. The coiled heat exchanger tube bundle is wound on the central tube in layers, and there are gaps between the layers of heat exchange tubes to ensure the flow of shell-side media. As a key component, the gasket also plays a role in fixing the shape and position of the tube bundle.

[0003] As the gaskets of the heat exchanger positioning elements, the current gaskets have the disadvantages of large pressure drop, untimely thermal expansion strain, excessive restraint of the spiral heat exchange tubes, and easy wear at the contact between the heat exchange tubes and the special-shaped gaskets, which in turn affects the service life and use effect of the heat exchanger.

[0004] Moreover, the gasket strips and the winding tube bundles need to be fixed with pipe clamps. The extensive use of pipe clamps increases the cost on the one hand. On the other hand, as in the prior art CN109084609B, a combination of gasket strips is used to replace the pipe clamps. However, there are still problems such as difficulty in welding the combination and the contact between the gasket strips and the tube bundle is still prone to wear.

[0005] In view of the above problems, the present invention designs and manufactures a coiled-tube heat exchanger gasket and a combined structure thereof to overcome the above defects. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a heat exchanger gasket strip and its combined structure, which can ensure the positioning of the heat exchange tube, not easily damage the heat exchange tube, and has a small pressure drop and timely response to thermal expansion. In addition, its combined structure is not only convenient for welding, but also the welding position is not easy to damage the heat exchange tube.

[0007] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a gasket strip for a coiled heat exchanger, comprising a base plate, a plurality of limiting teeth are arranged on one side of the base plate, the plurality of limiting teeth are arranged along the length direction of the base plate, and a positioning groove for positioning a heat exchange tube is formed between adjacent limiting teeth; A circulation space is provided between the limiting tooth root and the heat exchange tube, and the circulation space is located at two angle positions in the positioning groove.

[0008] Preferably, a rounded corner is provided between the root of the limiting tooth and the base plate.

[0009] Preferably, the limiting teeth are integrally formed with the base plate by stamping and bending, or the limiting teeth are welded to the base plate.

[0010] Preferably, the width of the positioning groove is equal to the sum of the diameter of the heat exchange tube and the movable spacing, and the movable spacing is 0.4-0.8 mm.

[0011] Preferably, the positioning groove forms an angle with the length direction of the substrate, and the size of the angle is equal to the winding angle of the heat exchange tube.

[0012] Preferably, the upper end of the limiting tooth is set as an arc segment, the radius of the arc segment is equal to the radius of the heat exchange tube, and the heat exchange tube can be in contact with the arc segment when located in the positioning groove.

[0013] Preferably, a column segment is provided at the end of the arc segment, and the column segment extends in a direction away from the surface of the substrate.

[0014] Preferably, the included angle between the limiting teeth and the base plate is an obtuse angle, the extending direction of the limiting teeth points to the center line of the installed center tube, and the extending direction of the base plate is tangent to the circumference of the tube bundle layer formed by the heat exchange tubes.

[0015] A wound tube heat exchanger gasket combination structure comprises at least two of the above-mentioned wound tube heat exchanger gaskets. Adjacent wound tube heat exchanger gaskets are stacked to seal a plurality of heat exchange tubes in positioning grooves.

[0016] Preferably, a plurality of connection holes are provided on the base plate of the WBE gasket strip, and the end of the limiting tooth of an adjacent WBE gasket strip can be matched with the connection hole on another WBE gasket strip; The matched limiting teeth and the connecting holes are all welded, or the matched limiting teeth and the connecting holes are intermittently welded along the length direction of the substrate.

[0017] Preferably, during intermittent welding, no connecting holes are provided at the intermittent positions, and the height of the matching limiting teeth corresponding to the intermittent positions is reduced.

[0018] Preferably, the position of the connecting hole corresponds to the position between two adjacent heat exchange tubes.

[0019] Preferably, when the distances between the heat exchange tubes between the adjacent gasket strips of the coiled heat exchanger are different, a gasket plate is provided at the bottom of the gasket strip of the coiled heat exchanger; The pad is provided with a through hole which is consistent with the position of the connection hole, or the pad is arranged on both sides of the connection hole.

[0020] Preferably, when adjacent coiled-tube heat exchanger gaskets are stacked, the inner side surface of the limiting tooth end of one coiled-tube heat exchanger gasket is abutted against the outer side surface of the limiting tooth root of another coiled-tube heat exchanger gasket and welded.

[0021] Preferably, when adjacent gaskets of the coiled-tube heat exchanger are stacked, the height of the positioning groove is the sum of the diameter of the heat exchange tube and the welding allowance, and the welding allowance is not less than 1 mm.

[0022] The invention is beneficial in that: 1. After the positioning groove formed by the limiting teeth of the gasket of the spiral wound heat exchanger cooperates with the heat exchange tube, a flow space is provided between the root of the limiting teeth and the heat exchange tube. Compared with the existing structure in which only the flow space between the upper part of the positioning groove and the heat exchange tube exists, since the flow space can ensure the passage of the fluid, the pressure drop is small, and the corresponding power consumption of the compressor is also small. Moreover, since the fluid around the heat exchange tube is always in motion, it is not easy to scale and form local pitting corrosion.

[0023] 2. In the present invention, a movable spacing is set between the positioning groove and the heat exchange tube. When the temperature changes drastically and there is a time difference in thermal expansion between the heat exchange tube and the positioning element, the heat exchange tube can move along the bottom plane of the positioning groove without forming internal stress, thereby avoiding wear between the heat exchange tube and the positioning groove, preventing the overall bulging of the heat exchange tube bundle, and buying time for the overall stable operation of the heat exchanger.

[0024] 3. The arc section provided in the present invention can not only position the heat exchange tube, but also effectively prevent the heat exchange tube from falling out due to gravity during use, thereby preventing the use effect or product life from being affected.

[0025] 4. The combined structure of the present invention can enclose the heat exchange tube in the positioning groove, ensuring the tight winding of the heat exchange tube and preventing loosening in the later stage of the winding process. It has a strong restraining effect on the heat exchange tube when in use, delays the falling of the heat exchange tube during use, and alleviates the load on the wrapping tube; at the same time, the flow space around the heat exchange tube and the closed positioning groove reduces the impact of the fluid on the combined structure, thereby improving the product performance and service life.

[0026] 5. When the distance between tubes in adjacent layers is inconsistent, the present invention uses a pad for adjustment, which is convenient for processing and saves costs. In addition, the welding position is not easy to damage the heat exchange tubes, and the skill requirements for operators are low.

[0027] 6. When the limiting tooth side surfaces of adjacent gasket strips of the coiled heat exchanger are welded in combination, welding is convenient and does not require grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a first embodiment of a gasket for a coiled tube heat exchanger; Figure 2 It is a partial top view of the first embodiment of the present invention; Figure 3 It is a partial front view of the first embodiment of the present invention after being matched with the heat exchange tube; Figure 4 It is a partial top view schematic diagram of the first embodiment of the present invention after being matched with the heat exchange tube; Figure 5 This is a partial front view of the second embodiment of the present invention after being matched with the heat exchange tube; Figure 6 It is a partial structural diagram of the third embodiment of the present invention; Figure 7 This is an installation orientation diagram of the fourth embodiment of the present invention; Figure 8 It is a partial structural diagram of the sixth embodiment of the present invention; Fig. 9 It is a partial front view of the sixth embodiment of the present invention; Fig.10 It is a partial side view of the sixth embodiment of the present invention; Fig.11 It is a partial side view of a through hole provided on the pad of the seventh embodiment of the present invention; Fig.12 It is a partial side view of the seventh embodiment of the present invention, in which the pads are arranged on both sides of the connection hole; Fig.13 It is a partial side view of the eighth embodiment of the present invention; Fig.14 It is a partial schematic diagram of the side surface welding of the limiting tooth of the adjacent third embodiment of the present invention.

[0029] In the figure: 1-base plate, 2-limiting teeth, 3-positioning grooves, 4-heat exchange tubes, 5-arc sections, 6-column sections, 7-connecting holes, 8-pads, and 9-through holes. DETAILED DESCRIPTION

[0030] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings. Embodiment 1

[0031] like Figures 1 to 4 As shown, a gasket for a coiled tube heat exchanger includes a base plate 1, a plurality of limit teeth 2 are provided on one side of the base plate 1, and the plurality of limit teeth 2 are arranged along the length direction of the base plate 1. The limit teeth 2 of the present invention and the base plate 1 can be integrally stamped and bent, or the limit teeth 2 can be directly welded and fixed on the base plate 1.

[0032] A positioning groove 3 for positioning the heat exchange tube 4 is formed between adjacent limiting teeth 2. The specific shape of the positioning groove 3 is determined by the shape of the limiting teeth 2. After the heat exchange tube 4 is positioned in the positioning groove 3, a flow space is provided between the root of the limiting teeth 2 and the heat exchange tube 4.

[0033] The circulation space is specifically located at two angles in the positioning groove 3. Specifically, the circulation space is the space between the two angles in the positioning groove 3 and the outer wall of the heat exchange tube 4. It is preferred to set a transition structure between the root of the limiting tooth 2 and the base plate 1. The transition structure is a rounded corner or a chamfer, etc., to ensure the connection strength between the two at this point. However, there is still a gap between the transition structure and the heat exchange tube 4. This gap is the circulation space between the root of the limiting tooth 2 and the heat exchange tube 4.

[0034] Compared with the existing structure in which there is only a circulation space above the positioning groove and the heat exchange tube, since the circulation space can ensure the passage of fluid, the pressure drop is small and the corresponding compressor power consumption is also small. Moreover, since the fluid around the heat exchange tube 4 is always in motion, it is not easy to scale and form local pitting corrosion.

[0035] A fillet is preferably provided between the root of the limiting tooth 2 and the base plate 1 to ensure the strength of the limiting tooth 2 when positioning the heat exchange tube 4 and reduce the impact of the fluid on the root of the limiting tooth 2. In addition, the edges of the spiral wound heat exchanger pads that contact the heat exchange tube 4 are preferably smooth to avoid damage to the heat exchange tube 4.

[0036] The width of the positioning groove 3 is equal to the sum of the diameter of the heat exchange tube 4 and the movable spacing. The movable spacing is 0.4-0.8mm, preferably 0.6mm, to provide deformation space for the heat exchange tube 4 to expand and contract due to heat. When the temperature changes drastically and there is a time difference in thermal expansion between the heat exchange tube 4 and the positioning element, the heat exchange tube 4 can move along the bottom plane of the positioning groove 3 without forming internal stress, thereby avoiding wear between the heat exchange tube 4 and the positioning groove 3, preventing the overall bulging of the heat exchange tube 4 bundle, and buying time for the overall stable operation of the heat exchanger.

[0037] The positioning groove 3 of the present invention forms an angle with the length direction of the substrate 1 , and the angle is equal to the winding angle of the heat exchange tube 4 , that is, the helical angle of the winding tube, thereby facilitating the winding of the heat exchange tube 4 . Embodiment 2

[0038] The same contents as those in the first embodiment will not be described in detail. Figure 5 As shown, in this embodiment, the upper end of the limiting tooth 2 is set as an arc segment 5, the radius of the arc segment 5 is equal to the radius of the heat exchange tube 4, and the heat exchange tube 4 can be in contact with the arc segment 5 when it is located in the positioning groove 3. The arc segment 5 set by the invention can not only position the heat exchange tube 4, but also effectively prevent the heat exchange tube 4 from falling out due to gravity during use, thereby preventing it from affecting the use effect or product life. Embodiment 3

[0039] like Figure 6 As shown, in this embodiment, a column section 6 is provided at the end of the arc section 5 of the second embodiment. The column section 6 extends away from the plate surface of the substrate 1, and is preferably perpendicular to the substrate 1. This structure is provided to facilitate combination with adjacent coil heat exchanger gaskets, that is, the arc section 5 is used to cooperate with the heat exchange tube, and the column section 6 is used to cooperate with the adjacent coil heat exchanger gaskets. Embodiment 4

[0040] like Figure 7As shown, in this embodiment, the angle between the limit tooth 2 and the base plate 1 is an obtuse angle. When the gasket of the spiral wound heat exchanger is installed, the extension direction of the limit tooth 2 points to the center line of the installed center tube, and the extension direction of the base plate 1 is tangent to the circumference of the tube bundle layer formed by the heat exchange tube 4, thereby facilitating the fixation of the spiral wound heat exchanger gasket. Embodiment 5

[0041] This embodiment provides a wound tube heat exchanger gasket assembly structure, including at least two of the above-mentioned wound tube heat exchanger gaskets, and the adjacent wound tube heat exchanger gaskets are stacked to seal a plurality of heat exchange tubes 4 in the positioning grooves 3. The stacking is preferably fixed by welding.

[0042] When adjacent coiled heat exchanger pads are stacked, the height of the positioning groove 3 is the sum of the diameter of the heat exchange tube 4 and the welding allowance, and the welding allowance is not less than 1 mm, preferably 2 mm. This ensures that the heat exchange tube 4 is tightly wound and prevents loosening in the later stage of the winding process.

[0043] The combined structure of the present invention can enclose the heat exchange tube 4 in the positioning groove 3, ensure the tight winding of the heat exchange tube 4, prevent loosening in the later stage of the winding process, have a strong restraining effect on the heat exchange tube 4 when in use, delay the falling of the heat exchange tube 4 during use of the product, alleviate the load on the wrapping tube, and improve the product performance and service life. Embodiment 6

[0044] like Figures 8 to 10 As shown, in this embodiment, a plurality of connection holes 7 are provided on the base plate 1 of the gasket strip of the coiled heat exchanger, and the end of the limiting tooth 2 of an adjacent coiled heat exchanger gasket strip can be matched with the connection hole 7 on the other coiled heat exchanger gasket strip. The position of the connection hole 7 specifically corresponds to the position between two adjacent heat exchange tubes 4. After positioning the heat exchange tubes 4, it is beneficial to the fluid distribution, prevents the additional wear on the heat exchange tubes 4, and reduces the grinding amount.

[0045] The matched limiting teeth 2 and the connecting holes 7 are welded, or the matched limiting teeth 2 and the connecting holes 7 are intermittently welded along the length direction of the substrate 1. When welding, the matching surfaces of the limiting teeth 2 and the connecting holes 7 are spot welded and fixed.

[0046] During intermittent welding, the connecting holes 7 may not be provided at the intermittent positions, and the height of the matching limiting teeth 2 corresponding to the intermittent positions can be reduced, thereby reducing the processing cost. Embodiment 7

[0047] like Fig.11 , Fig.12As shown, when the spacing between the heat exchange tubes 4 between adjacent coil heat exchanger pads is different, a pad 8 is preferably provided at the bottom of the coil heat exchanger pad, and a through hole 9 is provided on the pad 8 which is consistent with the position of the connecting hole 7, or the pad 8 is arranged on both sides of the connecting hole 7. This embodiment needs to be combined with the combined structure in the sixth embodiment, so that when the gap between the winding layers is different, the thickness of the pad 8 can be adjusted to meet the use requirements. In addition, the above structure is easy to process and saves costs. The welding position is not easy to damage the heat exchange tube 4, and the skill requirements for the operator are low. Embodiment 8

[0048] like Fig.13 , Fig.14 As shown, when adjacent coil heat exchanger gaskets are stacked, the inner side surface of the end of the limiting tooth 2 of one coil heat exchanger gasket is abutted against the outer side surface of the root of the limiting tooth 2 of another coil heat exchanger gasket and welded. When the side surfaces of the limiting teeth 2 of adjacent coil heat exchanger gaskets are welded, welding is convenient and no grinding is required.

[0049] In addition, the gaskets of two adjacent coiled-tube heat exchangers of the present invention can be close together or have a proper gap, and the gap should not exceed 0.3 mm. When the temperature changes drastically and there is a time difference in thermal expansion between the heat exchange tube 4 and the positioning element, internal stress can be avoided, wear can be reduced, and overall bulging of the tube bundle can be prevented.

[0050] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. A gasket for a coiled tube heat exchanger, characterized in that: It comprises a base plate (1), a plurality of limiting teeth (2) being provided on one side of the base plate (1), the plurality of limiting teeth (2) being arranged along the length direction of the base plate (1), and positioning grooves (3) for positioning the heat exchange tube (4) being formed between adjacent limiting teeth (2); A circulation space is provided between the root of the limiting tooth (2) and the heat exchange tube (4), and the circulation space is located at two angle positions in the positioning groove (3).

2. A gasket strip for a coiled heat exchanger according to claim 1, characterized in that: The limiting teeth (2) and the base plate (1) are integrally formed by stamping and bending, or the limiting teeth (2) are welded on the base plate (1).

3. The gasket strip for a coiled heat exchanger according to claim 1, characterized in that: The width of the positioning groove (3) is equal to the sum of the diameter of the heat exchange tube (4) and the movable spacing, and the movable spacing is 0.4-0.8 mm.

4. The gasket strip for a coiled heat exchanger according to claim 1, characterized in that: The positioning groove (3) forms an angle with the length direction of the base plate (1), and the size of the angle is equal to the winding angle of the heat exchange tube (4).

5. The gasket strip for a coiled heat exchanger according to claim 1, characterized in that: The upper end of the limiting tooth (2) is configured as an arc segment (5), the radius of the arc segment (5) being equal to the radius of the heat exchange tube (4), and the heat exchange tube (4) can abut against the arc segment (5) when located in the positioning groove (3).

6. A gasket strip for a coiled heat exchanger according to claim 5, characterized in that: A column section (6) is provided at the end of the arc section (5), and the column section (6) extends in a direction away from the surface of the base plate (1).

7. The gasket strip for a coiled heat exchanger according to claim 1, characterized in that: The included angle between the limiting teeth (2) and the base plate (1) is an obtuse angle, the extending direction of the limiting teeth (2) points to the center line of the installed center tube, and the extending direction of the base plate (1) is tangent to the circumference of the tube bundle layer formed by the heat exchange tubes (4).

8. A combined structure of gasket strips for a coiled tube heat exchanger, characterized in that: The device comprises at least two gaskets for the coiled-tube heat exchanger according to any one of claims 1 to 7, wherein adjacent coiled-tube heat exchanger gaskets are stacked to seal a plurality of heat exchange tubes (4) in the positioning grooves (3).

9. A combined structure of gasket strips for a coiled heat exchanger according to claim 8, characterized in that: A plurality of connection holes (7) are provided on the base plate (1) of the coiled heat exchanger gasket, and the end of the limiting tooth (2) of an adjacent coiled heat exchanger gasket can cooperate with the connection hole (7) on another coiled heat exchanger gasket; The matched limiting teeth (2) and the connecting holes (7) are all welded, or the matched limiting teeth (2) and the connecting holes (7) are intermittently welded along the length direction of the base plate (1).

10. A combined structure of gasket strips for a coiled-tube heat exchanger according to claim 9, characterized in that: During intermittent welding, no connection hole (7) is provided at the intermittent position, and the height of the matching limiting teeth (2) corresponding to the intermittent position is reduced.

11. A combined structure of gasket strips for a coiled tube heat exchanger according to claim 9, characterized in that: The position of the connecting hole (7) corresponds to the position between two adjacent heat exchange tubes (4).

12. A combined structure of gasket strips for a coiled tube heat exchanger according to claim 9, characterized in that: When the distances between the heat exchange tubes (4) between adjacent gasket strips of the coiled heat exchanger are different, a gasket plate (8) is provided at the bottom of the gasket strip of the coiled heat exchanger; The pad (8) is provided with a through hole (9) which is in the same position as the connection hole (7), or the pad (8) is arranged on both sides of the connection hole (7).

13. A combined structure of gasket strips for a coiled tube heat exchanger according to claim 8, characterized in that: When adjacent coiled-tube heat exchanger gaskets are stacked, the inner side surface of the end of the limiting tooth (2) of one coiled-tube heat exchanger gasket is abutted against the outer side surface of the root of the limiting tooth (2) of another coiled-tube heat exchanger gasket and welded.

14. A combined structure of gasket strips for a coiled tube heat exchanger according to claim 8, characterized in that: When adjacent coiled-tube heat exchanger gaskets are stacked, the height of the positioning groove (3) is the sum of the diameter of the heat exchange tube (4) and the welding allowance, and the welding allowance is not less than 1 mm.

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