A coil heat exchanger and its manufacturing tooling and manufacturing method

Abstract

This invention discloses a coil-type heat exchanger and its manufacturing tooling and method, including an inlet section pipe and a bent section pipe I connected to the inlet section pipe, with the other end of the bent section pipe I connected to an extension section pipe; it also includes an outlet section pipe, a bent section pipe II, and a process bend section pipe symmetrically arranged with the inlet section pipe, the bent section pipe I, and the extension section pipe, with the extension section pipe and the process bend section pipe connected by a connecting section pipe; the bending direction of the bent section pipe I is away from the outlet section pipe, and the bending direction of the bent section pipe II is away from the inlet section pipe, and all pipes have a rectangular cross-section. This invention increases the contact area with solid materials, improving heat exchange efficiency; it can be used in equipment requiring water and electricity separation, improving safety during use; when manufacturing rectangular cross-section heat exchange tubes, it ensures that cracks and wrinkles are not easily generated during bending; at the same time, the use of the process bend section pipe avoids interference caused by the heat exchanger itself.

Description

Technical Field

[0001] This invention belongs to the field of heat exchanger technology, and in particular relates to a coil heat exchanger and its preparation tooling and preparation method. Background Technology

[0002] A heat exchanger is a device for exchanging heat. It generally consists of two isolated, non-flowing channels or cavities. Fluids at a certain temperature and pressure flow within the two channels, forming heat exchange surfaces through materials with good thermal conductivity, thus achieving the purpose of heat exchange. In existing technology, coil heat exchangers generally have a circular cross-section, which is difficult to adapt to heat exchange between fluid media and solid materials, resulting in low heat exchange efficiency. Furthermore, the distance between the inlet and outlet ends of such coil heat exchangers is relatively large, making them unsuitable for certain equipment requiring water-electricity separation, and posing a safety risk. If the heat exchanger pipes are made into rectangles, existing technology presents challenges in the process of repeatedly bending rectangular tubes to form the heat exchanger tubes, making it difficult to integrally mold them, and causing problems such as cracking and wrinkling during bending. Summary of the Invention

[0003] Purpose of the invention: One purpose of this invention is to provide a coil heat exchanger with high heat exchange efficiency and safe operation. Another purpose is to provide a tooling and method for preparing a coil heat exchanger.

[0004] Technical solution: The coil heat exchanger of the present invention includes an inlet section pipe and a bent section pipe I connected to the inlet section pipe, the other end of which is connected to an extension section pipe; it also includes an outlet section pipe, a bent section pipe II, and a process bend section pipe symmetrically arranged with the inlet section pipe, the bent section pipe I, and the extension section pipe, and the extension section pipe and the process bend section pipe are connected by a connecting section pipe; the bending direction of the bent section pipe I is away from the outlet section pipe, the bending direction of the bent section pipe II is away from the inlet section pipe, and all pipes have rectangular cross sections.

[0005] The bent section pipe I includes a parallel bent section pipe I and a parallel bent section pipe II. One end of the parallel bent section pipe is connected to the inlet section pipe, and the other end is connected to the parallel bent section pipe II.

[0006] The bent section pipe II includes a parallel bent section pipe III and a parallel bent section pipe IV. One end of the parallel bent section pipe III is connected to the process bent section pipe, and the other end is connected to the parallel bent section pipe IV. The other end of the parallel bent section pipe IV is connected to the outlet section pipe.

[0007] The bent section pipe I and the bent section pipe II each include at least one set.

[0008] The extension section pipe is connected to the connecting section pipe via a vertical bend section pipe I; the connecting section pipe is connected to the process bend section pipe via a vertical bend section pipe II.

[0009] The bending radius of the bent section and the turning section of the pipe are the same, and the bending radius of the bent section and the turning section of the pipe is 1-2.5 times the width of the pipe.

[0010] The preparation tooling of the present invention includes an inner core support, an upper mold, a lower mold, and a calibration mold; wherein, the inner core support is a conformal mold set inside the heat exchanger pipe and with a cross-section similar to that of the pipe, the upper mold is roller-shaped with a raceway I in the middle part, the lower mold is a semi-circular mold with a raceway II on its arc surface, and the calibration mold has a calibration groove, the shape of which matches the shape of the heat exchanger after it is formed.

[0011] The manufacturing method of the coil heat exchanger of the present invention includes the following steps:

[0012] Step 1: Place the inner core support at the vertical bending section of pipe I, and use the upper die roller I and the lower die roller II to bend the rectangular tube at °. After bending, the inner core support is removed from the inlet section of pipe.

[0013] Step 1: Bend the bent section of pipe I using the method described in step 2. After bending, remove the inner core support from the inlet section of pipe.

[0014] Step 2: Place the inner core support at the vertical bending section of pipe II, and use the upper die roller I and the lower die roller II to bend the rectangular tube at °. After bending, remove the inner core support from the outlet section of the pipe.

[0015] Step 3: Fabricate the process bend section of the pipe, ensuring that the distance L between the two planes of the process bend section is greater than mm and the bending angle A is less than °;

[0016] Step 4: Bend the bent section of pipe II using the same method as in the previous step. After bending, remove the inner core support from the outlet section of the pipe.

[0017] Step 5: Place the heat exchanger in the calibration slot on the calibration mold and flatten the two process bend sections of the process bend pipe.

[0018] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The heat exchanger pipe cross-section of the present invention is rectangular, which increases the contact area with the solid material and improves the heat exchange efficiency; secondly, the symmetrical arrangement reduces the distance between the inlet and outlet of the heat exchange medium material, which can be used in equipment requiring water-electricity separation and improves the safety during use; when manufacturing the rectangular cross-section heat exchanger pipe, the present invention uses upper and lower molds as bending fixtures, and an inner core support is set in the bending part to ensure that cracks and wrinkles are not easily generated during bending; when bending the symmetrical part, a process bending section pipe is used to avoid interference caused by the heat exchanger itself. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the heat exchanger of the present invention;

[0020] Figure 2 This refers to the process bend portion of the heat exchanger of the present invention;

[0021] Figure 3 This is a side view of the heat exchanger process of the present invention;

[0022] Figure 4 This is the inner core support of the present invention;

[0023] Figure 5 The bending die of the present invention;

[0024] Figure 6 This is a schematic diagram of the bending of the heat exchanger of the present invention;

[0025] Figure 7 This is the correction mold for the heat exchanger of the present invention. Detailed Implementation

[0026] As attached Figure 1-7 As shown, the coil heat exchanger of this invention includes an inlet section pipe 8 and a bent section pipe I connected to the inlet section pipe 8, with the other end of the bent section pipe I connected to an extension section pipe 14; it also includes an outlet section pipe 7, a bent section pipe II, and a process bend section pipe 9 symmetrically arranged with the inlet section pipe 8, the bent section pipe I, and the extension section pipe 14, with the extension section pipe 14 and the process bend section pipe 9 connected by a connecting section pipe 15; the bending direction of the bent section pipe I 16 is away from the outlet section pipe 7, and the bending direction of the bent section pipe II is away from the inlet section pipe 8, and all pipes have rectangular cross-sections. The bent section pipe I includes a parallel bent section pipe I1 and a parallel bent section pipe II2, with one end of the parallel bent section pipe I connected to the inlet section pipe 8 and the other end connected to the parallel bent section pipe II2. The bend section pipe II includes parallel bend section pipe III5 and parallel bend section pipe IV6. One end of parallel bend section pipe III5 is connected to the process bend section pipe 9, and the other end is connected to parallel bend section pipe IV6. The other end of parallel bend section pipe IV6 is connected to the outlet section pipe 7. Each of the bend section pipes I and II includes at least one set. The extension section pipe 14 is connected to the connecting section pipe 15 via the vertical bend section pipe I3; the connecting section pipe 15 is connected to the process bend section pipe 9 via the vertical bend section pipe II4. In this embodiment, the cross-sectional area of ​​the rectangular pipe is 70mm × 30mm × 3mm (thickness). Other pipe diameters can be used for manufacturing depending on actual production needs.

[0027] The tooling of this invention includes an inner core support 10, an upper mold 11, a lower mold 12, and a calibration mold 13. The inner core support 10 is a conformal mold with a cross-section similar to that of the heat exchanger pipe, which is set inside the heat exchanger pipe. The upper mold 11 is roller-shaped with a raceway I111 in the middle. The lower mold 12 is a semi-circular mold with a raceway II121 on its arc surface. The calibration mold 13 has a calibration groove 131, the shape of which matches the shape of the heat exchanger after it is formed. The manufacturing method of the coil heat exchanger of the present invention includes the following steps: placing an inner core support 10 at the vertical bend section pipe I3; bending the rectangular tube at 90° using the raceway I111 of the upper mold 11 and the raceway II121 of the lower mold 12; removing the inner core support 10 from the inlet section pipe 8 after bending; bending the bend section pipe I16 using the method described in step 1; removing the inner core support 10 from the inlet section pipe 8 after bending; placing the inner core support 10 at the vertical bend section pipe II4; and using the raceway I111 of the upper mold 11... The rectangular tube is bent at 90° by the raceway II121 of the lower mold 12, and the inner core support 10 is removed from the outlet section pipe 7 after bending. The process bending section pipe 9 is made so that the distance L between the two planes of the process bending section pipe 9 is greater than 100mm and the bending angle A is less than 15°. The bending section pipe II17 is bent using the method in step 2, and the inner core support 10 is removed from the outlet section pipe 7 after bending. The heat exchanger is placed in the calibration groove 131 on the calibration mold 13, and the two process bending section planes of the process bending section pipe 9 are flattened.

Claims

1. A method for preparing a coil heat exchanger, characterized in that: The coil heat exchanger includes an inlet section pipe (8) and a bend section pipe I (16) connected to the inlet section pipe (8), with the other end of the bend section pipe I (16) connected to an extension section pipe (14); it also includes an outlet section pipe (7), a bend section pipe II (17), and a process bend section pipe (9) symmetrically arranged with the inlet section pipe (8), the bend section pipe I (16), and the extension section pipe (14), with the extension section pipe (14) and the process bend section pipe (9) connected by a connecting section pipe (15); the bending direction of the bend section pipe I (16) is away from the outlet section pipe (7), the bending direction of the bend section pipe II (17) is away from the inlet section pipe (8), and all pipes have rectangular cross sections; The tooling for preparing the coil heat exchanger includes an inner core support (10), an upper mold (11), a lower mold (12), and a calibration mold (13); wherein, the inner core support (10) is a conformal mold set inside the heat exchanger pipe and with a cross-section similar to that of the pipe, the upper mold (11) is a roller shape with a raceway I (111) in the middle part, the lower mold (12) is a semi-circular mold with a raceway II (121) on its arc surface, and the calibration mold (13) has a calibration groove (131) on it, the shape of the calibration groove (131) matching the shape of the heat exchanger after it is formed; The method for preparing the coil heat exchanger includes the following steps: Step 1: Set the inner core support (10) at the vertical bending section pipe I (3), and use the roller I (111) of the upper mold (11) and the roller II (121) of the lower mold (12) to bend the rectangular tube by 90°. After bending, the inner core support (10) is removed from the inlet section pipe (8). Step 2, bend the bent section pipe I (16) using the same method as in step 1, and remove the inner core support (10) from the inlet section pipe (8) after bending. Step 3: Set the inner core support (10) at the vertical bending section pipe II (4), and use the roller I (111) of the upper mold (11) and the roller II (121) of the lower mold (12) to bend the rectangular tube by 90°. After bending, the inner core support (10) is removed from the outlet section pipe (7). Step 4: Fabricate the process bend section pipe (9) so that the distance L between the two planes of the process bend section pipe (9) is greater than 100mm and the bending angle A is less than 15°. Step 5: Bend the bent section pipe II (17) using the same method as in Step 2, and remove the inner core support (10) from the outlet section pipe (7) after bending. Step 6: Place the heat exchanger in the calibration groove (131) on the calibration mold (13) and flatten the two process bending planes of the process bending section pipe (9).

2. The method for preparing a coil heat exchanger according to claim 1, characterized in that: The bent section pipe I (16) includes a parallel bent section pipe I (1) and a parallel bent section pipe II (2). One end of the parallel bent section pipe I (1) is connected to the inlet section pipe (8), and the other end is connected to the parallel bent section pipe II (2).

3. The method for preparing a coil heat exchanger according to claim 2, characterized in that: The bent section pipe II (17) includes a parallel bent section pipe III (5) and a parallel bent section pipe IV (6). One end of the parallel bent section pipe III (5) is connected to the process bent section pipe (9), and the other end is connected to the parallel bent section pipe IV (6). The other end of the parallel bent section pipe IV (6) is connected to the outlet section pipe (7).

4. The method for preparing a coil heat exchanger according to claim 3, characterized in that: The bent section pipe I (16) and the bent section pipe II (17) each include at least one set.

5. The method for preparing a coil heat exchanger according to claim 1, characterized in that: The extension section pipe (14) is connected to the connecting section pipe (15) through the vertical bend section pipe I (3); the connecting section pipe (15) is connected to the process bend section pipe (9) through the vertical bend section pipe II (4).

6. The method for preparing a coil heat exchanger according to claim 1, characterized in that: The bending radius of the bend section and the turning section of the pipe are the same, and the bending radius of the bend section and the turning section of the pipe is 1-2.5 times the width of the pipe.

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