Composite forming device for enhanced heat transfer tube

Abstract

A composite forming device for a reinforced heat transfer pipe relates to the technical field of heat transfer equipment processing and comprises a supporting base, a forming cavity, a radial hydraulic cylinder, a liquid storage device and a heating device, the forming cavity is a closed hollow container arranged on the supporting base, and clamping assemblies capable of fixing a pipe blank in the axial direction of the forming cavity are arranged on the forming cavity in pairs. Multiple sets of radial hydraulic cylinders and extrusion plates are arranged on the outer surface of the forming cavity, extrusion heads capable of conducting extrusion forming on the outer surface of a fixed pipe blank are arranged on the extrusion plates, the liquid storage device and the heating device are arranged outside the forming cavity, and the liquid storage device is connected into the clamping assembly through a pipeline. Hot fluid can be injected into the pipe blank for pressurization after the pipe blank is fixed; the high-pressure hot fluid is injected into the pipe blank during extrusion forming, the pipe blank is directly internally expanded and thermally expanded by the heated fluid, so that the distribution of the whole pipe wall becomes more uniform, uniform and accurate forming of the large-deformation pit pipe can be realized, and the method has the advantages of simplicity in operation and high forming precision.

Description

Technical Field

[0001] The present invention relates to the technical field of heat transfer equipment processing, and particularly relates to a composite forming device for enhanced heat transfer tubes. Background Art

[0002] Heat exchangers have been widely used in industrial applications such as chemical engineering, petroleum, and nuclear technology. With the development of heat exchange technology, the demand for improving heat exchange performance has increased rapidly, thus posing a wide range of requirements for heat transfer enhancement technology. The manufacture of enhanced heat transfer tubes has gradually become an important development direction for modern heat exchangers.

[0003] Currently, the manufacture of enhanced heat transfer tubes still mainly relies on mechanical extrusion and rolling, which have problems such as poor production accuracy and low production efficiency. For example, for the commonly used dimpled tubes in enhanced heat transfer tubes, they are usually produced by directly applying pressure on the surface of the tube body using extrusion or rolling equipment. In the current extrusion process, affected by the die structure, action accuracy of the extrusion equipment, and the thickness distribution of the tube blank itself, the tube wall is prone to the problem that the degree of extrusion force received at different positions is different during extrusion, resulting in uneven distribution of heat exchange units inside the heat transfer tube obtained by extrusion forming. As a result, the obtained enhanced heat transfer tube is difficult to withstand the high-pressure and high-speed fluid erosion in the use environment, shortening the service life of the heat transfer tube and having great potential safety hazards in use. In addition, for heat transfer tubes with a longer length, the entire forming process takes a long time and is extremely inconvenient. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a composite forming device for enhanced heat transfer tubes, which can extrude and form enhanced heat transfer tubes more efficiently and uniformly.

[0005] To solve the above at least one technical problem, the technical solution provided by the present invention is:

[0006] A composite forming device for enhanced heat transfer tubes, comprising a support base, a forming cavity, radial hydraulic cylinders, a liquid storage device, and a heating device. Among them, the forming cavity is a sealed hollow container arranged on the support base, and a clamping assembly capable of fixing the tube blank along the axial direction of the forming cavity is arranged in pairs on the forming cavity;

[0007] Multiple groups of radial hydraulic cylinders are arranged on the outer surface of the forming cavity, an extrusion plate is arranged on the hydraulic output end of the radial hydraulic cylinders, and an extrusion head capable of extruding and forming the outer surface of the fixed tube blank is arranged on the extrusion plate;

[0008] The liquid storage device and the heating device are arranged outside the forming cavity, and the liquid storage device is connected to the clamping assembly through a pipeline and can inject hot fluid into the inside of the tube blank for pressurization after the tube blank is fixed.

[0009] One embodiment of the present invention is that the clamping assembly includes an axial hydraulic cylinder, a liquid guiding support, a mating support, an outer fixed support, and an inner fixed support. Among them, the axial hydraulic cylinder is arranged on the support base, and its hydraulic output end is connected to the liquid guiding support arranged outside the forming cavity. The liquid guiding support is connected to the mating support extending into the forming cavity. An outer fixed support is detachably arranged on the mating support, and an inner fixed support is detachably arranged on the outer fixed support for clamping and fixing the tube blank between the outer fixed support and the inner fixed support.

[0010] Liquid guiding pipes that can communicate with each other are provided inside the liquid guiding support, the mating support, the outer fixed support, and the inner fixed support. The pipe of the inner fixed support can communicate with the inside of the tube blank. The pipe of the liquid guiding support and the liquid storage device form a connected circulation pipeline, and the heating device can heat the fluid in the pipeline between the liquid guiding support and the liquid storage device.

[0011] Further, the outer fixed support is funnel-shaped, its neck is detachably connected coaxially with the mating support, the inner fixed support is umbrella-shaped, and its umbrella handle part is detachably connected coaxially with the center of the funnel part of the outer fixed support. The tube blank can be coaxially clamped and fixed between the inner wall of the funnel shape of the outer fixed support and the umbrella edge of the inner fixed support. The pipes inside the outer fixed support and the inner fixed support are connected along the axis of the tube blank.

[0012] Further, a slide rail is arranged on the support base along the axial direction of the tube blank, and the axial hydraulic cylinder is arranged on the slide rail and can move along the slide rail.

[0013] Further, a rotating member is arranged at the hydraulic output end of the axial hydraulic cylinder. The rotating member is coaxially connected with the liquid guiding support and can drive the liquid guiding support and the mating support to rotate around the axis.

[0014] Further, a sealing ring is arranged on the inner wall of the funnel part of the outer fixed support.

[0015] Further, the inner fixed support is made of copper.

[0016] One embodiment of the present invention is that multiple groups of radial hydraulic cylinders are arranged at equal intervals around the tube blank. Their output ends extend into the forming cavity and the tips are connected with extrusion plates. Multiple groups of extrusion heads are detachably arranged side by side at intervals along the axial direction of the tube blank on the extrusion plates, and the extrusion ends of the extrusion heads point towards the axis of the tube blank in the radial direction.

[0017] One embodiment of the present invention is that a drain branch pipe is arranged on the connecting pipeline between the liquid storage device and the clamping assembly.

[0018] The technical effects achieved by the present invention are:

[0019] 1. When the present invention is subjected to extrusion molding, high-pressure hot fluid is injected into the inside of the tube blank. The tube blank is directly expanded inward and thermally expanded by the hot fluid, making the distribution of the entire tube wall more uniform. Through this method of internal pressure bulging and external mechanical extrusion, the uniform and accurate forming of the large-deformation pit tube is realized, which has the advantages of simple operation and high forming accuracy.

[0020] 2. The present invention is provided with a slide rail on the support base, which can increase the axial feed flexibility of the matching support seat that plays a main role in fixing and supporting the tube blank, facilitating the real-time control of the feed speed and feed length, and having stronger processing adaptability.

[0021] 3. The tube blank is clamped by the internal and external fixed supports, which can ensure the sealing performance while stably clamping, and effectively adapt to the internal high-pressure environment during forming.

[0022] 4. The outside of the tube is extruded and formed through a mechanical extrusion structure. By controlling the position and quantity of the mechanical extrusion system, the tube blank can be accurately and quickly formed according to requirements, and the forming of tubes with different pit sizes can be achieved by adjusting the size of the external extrusion structure, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0024] Figure 1 is the overall schematic diagram of the present invention;

[0025] Figure 2 is the schematic diagram when the extrusion head extrudes the tube blank in the present invention;

[0026] Figure 3 is Figure 1 the partial enlarged view of part A in

[0027] In the figure, 1 - support base, 2 - tube blank, 3 - forming cavity, 4 - radial hydraulic cylinder, 5 - extrusion plate, 6 - extrusion head, 7 - slide rail, 8 - axial hydraulic cylinder, 9 - liquid guide support, 10 - matching support, 11 - external fixed support, 12 - internal fixed support, 13 - sealing ring, 14 - liquid storage device, 15 - heating device, 16 - liquid discharge branch pipe, 17 - rotating part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present invention will be further described in detail below in conjunction with the embodiments and the drawings.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention.

[0030] Example:

[0031] See Figure 1 , a composite forming device for enhanced heat transfer tubes, including a support base 1, a forming cavity 3, a radial hydraulic cylinder 4, a liquid storage device 14, and a heating device 15. Among them, the forming cavity 3 is a sealed hollow container arranged on the support base 1. A clamping assembly capable of fixing the tube blank 2 along the axial direction of the forming cavity 3 is arranged in pairs on the forming cavity 3 for axially clamping the tube blank 2.

[0032] Specifically, the clamping assembly in this embodiment includes an axial hydraulic cylinder 8, a liquid guide support 9, a mating support 10, an outer fixed support 11, and an inner fixed support 12. Among them, the axial hydraulic cylinder 8 is arranged on the support base 1, and its hydraulic output end is connected to the liquid guide support 9 arranged outside the forming cavity 3. The liquid guide support 9 is connected to the mating support 10 extending into the interior of the forming cavity 3. An outer fixed support 11 is detachably arranged on the mating support 10, and an inner fixed support 12 is detachably arranged on the outer fixed support 11 for clamping and fixing the tube blank 2 between the outer fixed support 11 and the inner fixed support 12. See Figure 3 , the clamping assemblies are arranged in pairs in the forming cavity 3. One end of the tube blank 2 is placed in the outer fixed support 11 and contacts it through the outer surface of the tube blank 2. The other end of the tube blank 2 is fixed by the outer fixed support 11 on the opposite side. On this basis, the inner wall of the tube blank 2 respectively contacts the paired inner fixed supports 12, so that the tube blank 2 is actually clamped by the outer fixed support 11 and the inner fixed support 12. After the axial hydraulic cylinders 8 on both sides output pressure towards the liquid guide support 9, the tube blank 2 can be fixed.

[0033] The liquid guiding support 9, the mating support 10, the outer fixing support 11, and the inner fixing support 12 are all provided with pipelines that can communicate with each other. The pipeline of the inner fixing support 12 can communicate with the inside of the tube blank 2. The pipeline of the liquid guiding support 9 and the liquid storage device 14 form a connected circulation pipeline. The heating device 15 can heat the fluid in the pipeline between the liquid guiding support 9 and the liquid storage device 14. When extruding the tube blank 2, hot fluid with a certain pressure can be filled into the inside of the tube blank 2 through the circulation pipeline, so that the inside of the tube blank 2 is under pressure and is affected by thermal expansion and contraction as a whole, thereby expanding uniformly outward, and further making the external extrusion pressure more uniform during subsequent extrusion.

[0034] In this embodiment, the outer fixing support 11 is funnel-shaped, and its neck is detachably connected coaxially with the mating support 10. The inner fixing support 12 is umbrella-shaped, and its handle part is detachably connected coaxially with the center of the funnel part of the outer fixing support 11. The tube blank 2 can be coaxially clamped and fixed between the funnel-shaped inner wall of the outer fixing support 11 and the umbrella edge of the inner fixing support 12. The pipelines inside the outer fixing support 11 and the inner fixing support 12 are connected along the axis of the tube blank 2. It can be seen that the umbrella surfaces of the paired inner fixing supports 12 can form a space for accommodating fluid with the inside of the tube blank 2, and the tube blank 2 is sleeved in the paired outer fixing supports 11. Even if some fluid leaks out through the inner fixing support 12, it will enter the space between the tube blank 2 and the outer fixing support 11, playing a role of double pressure maintaining and leak prevention, which is beneficial to maintaining the uniform internal pressure of the tube blank 2. At the same time, both the outer fixing support 11 and the inner fixing support 12 are set and fixed by detachable connection methods. In this way, the outer fixing support 11 and the inner fixing support 12 with corresponding sizes can be matched according to the wall thickness of the tube blank 2 to be clamped, so that the outer fixing support 11 and the inner fixing support 12 can just contact the inner and outer surfaces of the tube blank 2. After the axial hydraulic cylinder 8 applies pressure in the opposite direction, effective sealing and fixing of the tube blank 2 can be achieved.

[0035] In addition, a sealing ring 13 is also provided on the inner wall of the funnel part of the outer fixing support 11. After the tube blank 2 bears the internal pressure, the contact performance between the tube blank 2 and the outer fixing support 11 will be enhanced, and the probability of external leakage of the fluid inside it will also increase accordingly. Therefore, further sealing is achieved through the sealing ring 13 to effectively prevent the leakage of the fluid inside the tube blank 2.

[0036] Multiple groups of radial hydraulic cylinders 4 are arranged on the outer surface of the forming cavity 3. The hydraulic output ends of the radial hydraulic cylinders 4 are provided with extrusion plates 5, and the extrusion plates 5 are provided with extrusion heads 6 that can extrude and form the outer surface of the fixed tube blank 2.

[0037] See Figure 1 、 Figure 2, in this embodiment, multiple sets of radial hydraulic cylinders 4 are arranged around the tube blank 2 at equal intervals. Their output ends extend into the forming cavity 3, and the tips are connected with an extrusion plate 5. Multiple sets of extrusion heads 6 are detachably arranged side by side at intervals along the axial direction of the tube blank 2 on the extrusion plate 5. The extrusion ends of the extrusion heads 6 point to the axis of the tube blank 2 in the radial direction. The radial hydraulic cylinders 4 can drive the extrusion plate 5 to move towards the tube blank 2 in the radial direction, so that the extrusion heads 6 on the extrusion plate 5 pointing to the tube blank 2 generate extrusion on the outer surface of the tube blank 2, thereby forming the internal concavity required for the enhanced heat transfer tube. The position number of the radial hydraulic cylinders 4 and the corresponding extrusion plate 5 can be determined according to the extrusion requirements, and the number of the extrusion heads 6 on the extrusion plate 5 can also be disassembled and set according to the requirements, thereby expanding the variety range of the finally formed enhanced heat transfer tubes.

[0038] The liquid storage device 14 and the heating device 15 are arranged outside the forming cavity 3. The liquid storage device 14 is connected to the clamping assembly through a pipeline and can inject hot fluid into the inside of the tube blank 2 for pressurization after the tube blank 2 is fixed. The function of the liquid storage device 14 is to fill high-pressure fluid into the inside of the tube blank 2 during extrusion and maintain the pressure stability. Therefore, its structure can adopt the device with the integrated setting of a liquid pump, a liquid storage device, a pressure control device and a control device in the prior art. When the internal pressure of the tube blank 2 changes, the liquid storage device 14 can automatically perform appropriate drainage or injection operations to maintain the pressure stability. The heating device 15 can also refer to the equipment for heating the fluid in the pipeline in the prior art, so that the fluid injected into the tube blank 2 maintains the temperature, so that the tube blank 2 expands outwards under the dual action of the internal pressure and the thermal expansion and contraction effect.

[0039] In some embodiments, a drain branch pipe 16 is arranged on the connecting pipeline between the liquid storage device 14 and the clamping assembly, which is used to drain the fluid in the pipeline after the forming is completed.

[0040] In addition, in some embodiments, a slide rail 7 is arranged along the axial direction of the tube blank 2 on the support base 1. The axial hydraulic cylinder 8 is arranged on the slide rail 7 and can move along the slide rail 7, and the position of the axial hydraulic cylinder 8 can be finely adjusted. A rotating member 17 is arranged at the hydraulic output end of the axial hydraulic cylinder 8. The rotating member 17 is coaxially connected with the liquid guide support 9, and it can drive the liquid guide support 9 and the matching support 10 to rotate around the axis. It can be realized in the form of a rotating motor in the prior art. The rotating member 17 can drive the liquid guide support 9 and all the subsequent connected components to rotate arbitrarily as required, that is, allowing the tube blank 2 to rotate synchronously. In specific use, by controlling the synchronous rotation of the rotating members 17 on both sides, the tube blank 2 can be driven to rotate. Through rotation, the position of the tube blank 2 subjected to extrusion can be adjusted, so that the extrusion internal concavity can be set on the surface of the tube blank 2 according to specific needs.

[0041] In some embodiments, the internal fixing support 12 is made of copper. Copper materials have good thermal expansion and contraction effects and are prone to expansion after being heated. After injecting hot fluid into the inside of the tube blank 2, the tube blank 2 will expand outwards. At this time, the copper internal fixing support 12 can also expand due to obvious thermal expansion, thereby improving the sealing effect of the internal fixing support 12 on the fluid.

[0042] In summary, the usage method of the present invention is as follows:

[0043] Arrange the tube blank 2 between the external fixing support 11 and the internal fixing support 12 according to the Figure 1 structure shown. The gap between the installed external fixing support 11 and the internal fixing support 12 is determined according to the size of the tube blank 2. Then, the axial hydraulic cylinders 8 on both sides output pressure to axially clamp the tube blank 2, and the position of the tube blank 2 is finely adjusted through the rotating member 17 and the slide rail 7. Next, the liquid storage device 14 and the heating device 15 inject hot fluid into the inside of the tube blank 2 and maintain the internal pressure of the tube blank 2 stable. Then, control the radial hydraulic cylinder 4 to output pressure to the extrusion plate 5 as needed. The extrusion plate 5 and the extrusion head 6 thereon output radial pressure to the tube blank 2 to perform extrusion forming on the tube blank 2 with uniform expansion, and press the required inner concave on the outer surface of the tube blank 2. During this process, the liquid storage device 14 maintains the internal pressure of the tube blank 2 constant by draining liquid, so as to realize the uniform extrusion forming of the tube blank 2.

[0044] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the embodiments of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A composite forming device for enhancing heat transfer tubes, characterized in that: The invention comprises a support base (1), a molding cavity (3), a radial hydraulic cylinder (4), a liquid storage device (14), and a heating device (15), wherein the molding cavity (3) is a closed hollow container arranged on the support base (1), and the molding cavity (3) is provided with a pair of clamping assemblies capable of fixing the tube blank (2) along the axial direction of the molding cavity (3); A plurality of radial hydraulic cylinders (4) are arranged on the outer surface of the forming cavity (3); an extrusion plate (5) is arranged on the hydraulic output end of the radial hydraulic cylinder (4); and an extrusion head (6) is arranged on the extrusion plate (5) for extruding and forming the outer surface of the fixed tube blank (2); The liquid storage device (14) and the heating device (15) are arranged outside the molding cavity (3); the pipeline of the liquid storage device (14) is connected to the clamping assembly, and hot fluid can be injected into the interior of the tube blank (2) for pressurization after the tube blank (2) is fixed.

2. The device for composite forming of enhanced heat transfer tubes according to claim 1, characterized in that: The clamping assembly comprises an axial hydraulic cylinder (8), a liquid-conducting support (9), a matching support (10), an external fixed support (11), and an internal fixed support (12), wherein the axial hydraulic cylinder (8) is arranged on the support base (1), and its hydraulic output end is connected to the liquid-conducting support (9) arranged outside the molding cavity (3), the liquid-conducting support (9) is connected to the matching support (10) extending into the molding cavity (3), the matching support (10) is detachably provided with an external fixed support (11), and the external fixed support (11) is detachably provided with an internal fixed support (12) for clamping and fixing the tube blank (2) between the external fixed support (11) and the internal fixed support (12); The liquid conducting support (9), the matching support (10), the external fixed support (11), and the internal fixed support (12) are all provided with pipelines that can be interconnected. The pipeline of the internal fixed support (12) can be connected to the inside of the tube blank (2). The pipeline of the liquid conducting support (9) and the liquid storage device (14) form a circulating pipeline that is connected. The heating device (15) can heat the fluid in the pipeline between the liquid conducting support (9) and the liquid storage device (14).

3. The device for composite forming of enhanced heat transfer tubes according to claim 2, characterized in that: The external fixed support (11) is funnel-shaped, and its neck is coaxially detachably connected to the matching support (10); the internal fixed support (12) is umbrella-shaped, and its umbrella handle is coaxially detachably connected to the center of the funnel portion of the external fixed support (11); the tube blank (2) can be coaxially clamped and fixed between the funnel-shaped inner wall of the external fixed support (11) and the umbrella edge of the internal fixed support (12); and the pipelines inside the external fixed support (11) and the internal fixed support (12) are connected along the axis of the tube blank (2).

4. The device for composite forming of enhanced heat transfer tubes according to claim 2, characterized in that: A slide rail (7) is arranged on the support base (1) along the axial direction of the tube blank (2), and an axial hydraulic cylinder (8) is arranged on the slide rail (7) and is capable of moving along the slide rail (7).

5. The device for composite forming of enhanced heat transfer tubes according to claim 2, characterized in that: The hydraulic output end of the axial hydraulic cylinder (8) is provided with a rotating member (17), which is coaxially connected to the liquid-conducting support (9) and can drive the liquid-conducting support (9) and the matching support (10) to rotate around the axis.

6. The device for composite forming of enhanced heat transfer tubes according to claim 3, characterized in that: A sealing ring (13) is provided on the inner wall of the funnel portion of the external fixed support (11).

7. The device for composite forming of enhanced heat transfer tubes according to claim 3, characterized in that: The inner fixing support (12) is made of copper.

8. The device for composite forming of enhanced heat transfer tubes according to claim 1, characterized in that: The plurality of radial hydraulic cylinders (4) are arranged around the tube blank (2) at equal intervals, and their output ends extend into the interior of the forming cavity (3) and are connected to an extrusion plate (5) at their tips. The extrusion plate (5) is provided with a plurality of extrusion heads (6) detachably arranged side by side and at intervals along the axial direction of the tube blank (2), and the extrusion ends of the extrusion heads (6) point to the axis of the tube blank (2) in the radial direction.

9. The device for composite forming of enhanced heat transfer tubes according to claim 1, characterized in that: A liquid discharge branch pipe (16) is provided on the connecting pipeline between the liquid storage device (14) and the clamping assembly.

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