Outer fin reinforced condenser pipe

Abstract

The invention relates to an outer fin reinforced condenser pipe which comprises a pipe body and outer fins integrally formed with the pipe body, materials on the pipe body extend in the radius direction of the pipe body and spirally extend on the outer surface of the pipe body around the pipe body, and the thicknesses of the two sides of the outer fins are gradually reduced outwards in the radius direction of the pipe body. A spiral channel is formed by a gap between every two adjacent outer fins; fin top grooves are formed in the top ends of the outer fins, and the fin top grooves are formed in the spiral extending direction of the outer fins at intervals; wing tips are arranged on the side edges of the outer fins, and the wing tips are arranged at intervals in the spiral extending direction of the outer fins; an internal thread rib integrally formed with the pipe body is arranged on the inner surface of the pipe body in a protruding mode. The sharp fin tips are additionally arranged on the outer fins, the surface tension of a liquid film of condensate is further damaged through the fin tip structures, the thickness of the liquid film is reduced, the heat resistance outside the pipe is reduced, meanwhile, the heat exchange area is effectively increased, and the heat exchange effect outside the pipe is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of condensation heat exchange in air-conditioning and refrigeration systems, and in particular to an external fin enhanced condenser tube. Background Art

[0002] In recent years, with the development of technology in the field of refrigeration and air-conditioning, the heat exchanger manufacturing technology has been continuously updated, and the design and manufacturing technology of heat exchange tubes for heat exchangers has also been continuously updated and developed.

[0003] The water-cooled condensers used in centrifugal and screw refrigeration units are mainly horizontal shell and tube heat exchangers. In the horizontal shell and tube condenser, the heat exchange tubes are arranged horizontally, and the refrigerant vapor condenses and exchanges heat outside the tubes to form a liquid film. The refrigerant gas is forced to condense on the outer surface of the liquid film. The latent heat released must be transferred to the heat exchange tube through the liquid film. The existence of the condensed liquid film increases the heat transfer resistance, thereby causing temperature difference loss, resulting in reduced refrigeration efficiency, and affecting the heat exchange performance of the heat exchange tube.

[0004] Therefore, in order to improve the heat transfer performance of the heat exchange tube, it is necessary to adopt enhanced heat transfer technology. In order to further improve the performance of the condensing heat exchanger, fins are formed on the outer surface of the heat exchange tube by machining, and then gaps are pressed out on the top of the fins to form serrated fins. The serrated fins are then used to thin the liquid film, promote the flow of the liquid film, and effectively increase the heat exchange area, thereby improving the heat exchange effect. However, there is still room for improvement in further improving the heat transfer performance of the heat exchange tube. Summary of the invention

[0005] The purpose of the present invention is to provide an external fin enhanced condenser tube, which improves the heat exchange efficiency of the condenser in the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides an external fin enhanced condenser, comprising: a tube body and external fins formed integrally with the tube body, which are formed by extending the material on the tube body along the radial direction of the tube body and extending in a spiral state around the tube body on the outer surface of the tube body, the thickness of both sides of the external fins gradually decreases outward along the radial direction of the tube body; the gap between two adjacent external fins constitutes a spiral groove; wing top grooves are provided at the top of the external fins, and the wing top grooves are arranged at intervals along the spiral extension direction of the external fins; wing tips are provided on the sides of the external fins, and the wing tips are arranged at intervals along the spiral extension direction of the external fins; and internal threaded ribs formed integrally with the tube body are convexly provided on the inner surface of the tube body.

[0007] Furthermore, the wing tip is a sharp protrusion, and the sharp part of the sharp protrusion faces outside the tube body.

[0008] Furthermore, the wing tip is arranged on one side or both sides of the outer fin.

[0009] Furthermore, one or more rows of wing tips are arranged on one side of the outer fin.

[0010] Furthermore, the wing tips on one side of the outer fin are arranged in two rows, and the two rows of wing tips are arranged staggered or correspondingly.

[0011] Furthermore, the spiral groove is wider at the top and narrower at the bottom.

[0012] Furthermore, the opening direction of the wing top groove is arranged to intersect with the direction of the spiral groove, and the wing top groove is communicated with the spiral groove.

[0013] Furthermore, the wing top grooves on two adjacent outer fins are interconnected.

[0014] Furthermore, the gap between two adjacent internal thread ribs constitutes an internal thread groove.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The present invention provides an external fin enhanced condenser, in which the external fins and the tube body are integrally formed, eliminating the contact thermal resistance between the two; and because the thickness on both sides of the external fins decreases in the outward direction, it is beneficial to destroy the tension of the condensation liquid film outside the tube and thus reduce the thickness of the liquid film; the wing tips arranged on the sides of the external fins and the grooves opened on the top of the external fins are beneficial to destroying the surface tension of the condensation liquid film, thinning the thickness of the condensation liquid film, thereby reducing thermal resistance, and at the same time the heat exchange area is effectively increased, further improving the heat exchange effect outside the tube; the internal threaded ribs arranged on the inner surface of the tube body are beneficial to improving the flow state of the fluid in the tube, thinning the boundary layer, reducing the thermal resistance of the heat exchange in the tube, optimizing the heat exchange efficiency inside and outside the tube, and improving the overall heat exchange performance of the condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 A schematic diagram of the three-dimensional structure of an external fin enhanced condenser provided in the present invention; Figure 2 A front view of an external fin enhanced condenser provided in the present invention; Figure 3 A top view of an external fin enhanced condenser provided in the present invention; Figure 4It is a right side view of an external fin enhanced condenser provided in the present invention; Figure 5 A cross-sectional view of an external fin enhanced condenser provided in the present invention; The reference numerals are as follows: 1. Tube body; 2. External fins; 21. Fin top groove; 22. Fin tip; 3. Spiral groove; 4. Internal thread rib; 41. Internal thread groove. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 The three-dimensional structural schematic diagram of an external fin enhanced condenser shown is a portion of the enhanced condenser cut away, which includes a tube body 1, and external fins 2 and internal threaded ribs 4 integrally formed with the tube body 1.

[0019] See also Figures 1 to 5 The outer fin 2 extends along the radial direction of the tube body 1 and extends in a spiral state around the tube body on the outer surface of the tube body. The outer fin 2 is rolled from the material on the tube body 1. The one-piece molding arrangement eliminates the contact thermal resistance between the outer fin 2 and the tube body 1, thereby reducing the heat transfer loss between the two.

[0020] The thickness of both sides of the outer fin 2 gradually decreases outward along the radius of the tube body 1, that is, the thickness of the bottom end of the outer fin 2 is greater than the thickness of the top end. The thicker part at the bottom end of the outer fin 2 can effectively enhance the turbulence of the condensate, thereby improving the heat transfer efficiency. As the outer fin 2 gradually becomes thinner outward, the resistance of the condensate can be reduced, the flow loss can be reduced, and the flow characteristics of the condensate can be improved. In addition, the bottom end of the outer fin 2 is set to be thicker, which can increase the surface area in contact with the condensate and improve the efficiency of heat exchange, while the design of gradually decreasing thickness helps to maintain the speed of the condensate flowing through the outer fin 2, thereby optimizing the overall heat transfer performance.

[0021] The gap between two adjacent outer fins 2 forms a spiral groove 3, and each spiral groove 3 is connected to each other. In this embodiment, the spiral groove 3 is a structure that is wide at the top and narrow at the bottom. The spiral groove 3 that is wide at the top and narrow at the bottom can enhance the fluidity of the condensate and promote the transfer of heat in the fluid, thereby improving the condensation efficiency. By optimizing the flow path of the condensate, the flow resistance of the condensate is reduced, and the heat exchange efficiency is ensured.

[0022] The top of the outer fin 2 is provided with a wing top groove 21, and each wing top groove 21 is spaced apart along the spiral extension direction of the outer fin 2. The directions of each wing top groove 21 are consistent, and the wing top grooves 21 on two adjacent outer fins 2 are mutually connected. Thus, a number of notches are formed at the wing top, which is conducive to further promoting the flow of condensate, reducing the thickness of the liquid film, reducing the thermal resistance outside the tube, and effectively increasing the heat exchange area, thereby further improving the heat exchange effect outside the tube.

[0023] In addition, the opening direction of the wing top groove 21 and the direction of the aforementioned spiral groove 3 are arranged crosswise, that is, the direction of the wing top groove 21 and the direction of the spiral groove 3 are interlaced, and the wing top groove 21 and the spiral groove 3 are connected. The wing top groove 21 and the spiral groove 3 are arranged to be connected, which can reduce the flow dead zone, improve the flow characteristics of the condensate, reduce the thermal resistance of the condensate when sliding on the fin surface, and simultaneously increase the turbulence of the condensate, thereby improving the energy efficiency of the system.

[0024] It should be noted that the depth, direction, number of the wing top grooves 21 and the spacing between adjacent wing top grooves 21 can be reasonably arranged and adjusted according to actual needs.

[0025] In order to further improve the heat exchange effect, in this embodiment, a wing tip 22 structure is also provided on the side of the outer fin 2. Consistent with the wing top groove 21, the wing tip 22 is also arranged at intervals along the spiral extension direction of the outer fin 2. Specifically, the wing tip 22 is a sharp protrusion, and the sharp part of the sharp protrusion faces the outside of the tube body 1, which is intended to destroy the surface tension of the liquid film of the condensate through the sharp part, reduce the thickness of the liquid film, improve the flow efficiency of the condensate, reduce the thermal resistance outside the tube, and increase the heat exchange area, thereby further improving the heat exchange effect outside the tube.

[0026] In this embodiment, the wing tips 22 can be arranged on one side or both sides of the outer fin 2, and whether to arrange on one side or both sides can be adjusted according to actual needs. In addition, the wing tips 22 can also be arranged in one row or two rows, or in other numbers of rows. When the wing tips 22 are arranged in two or more rows, the wing tips 22 between two adjacent rows can be staggered or arranged in correspondence.

[0027] Whether staggered or corresponding, the turbulence of the condensate at the wing tip 22 can be increased to a certain extent, thereby improving the drainage efficiency of the condenser and the heat transfer performance.

[0028] The inner surface of the tube body 1 is provided with an internal thread rib 4, and the gap between two adjacent internal thread ribs 4 forms an internal thread groove 41. The setting of the internal thread state is conducive to improving the flow state of the fluid in the tube, thinning the boundary layer, reducing the thermal resistance of the heat exchange in the tube, optimizing the heat exchange efficiency inside and outside the tube, and improving the overall heat exchange performance of the heat exchange tube.

[0029] In summary, the external fin enhanced condenser tube of this example sets the tube body 1 and the external fin 2 as an integral molding to reduce the energy loss during heat transfer; at the same time, a wing tip 22 is set on the side of the external fin 2, and a wing top groove 21 is opened on the top of the external fin 2 to increase the heat exchange surface area outside the tube, promote the flow of condensate, reduce the thickness of the liquid film, reduce the thermal resistance outside the tube, and improve the heat exchange efficiency, thereby reducing the weight of the heat exchange tube and strengthening the heat exchange process. At the same time, with the help of the structure of the internal threaded rib 4, the fluid in the tube forms a turbulent state, thins the boundary layer, promotes convection and mixing between the fluids, and promotes the effective improvement of the heat exchange efficiency.

[0030] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An external fin enhanced condenser tube, characterized in that: include: A tube body (1) and an outer fin (2) formed integrally with the tube body (1) and extending from a material on the tube body (1) along the radial direction of the tube body (1) and extending in a spiral state around the tube body (1) on the outer surface of the tube body (1), the thickness of both sides of the outer fin (2) gradually decreasing outward along the radial direction of the tube body (1); a gap between two adjacent outer fins (2) forming a spiral groove (3); a wing top groove (21) is provided at the top of each outer fin (2), and the wing top groove (21) is arranged at intervals along the spiral extension direction of the outer fin (2); a wing tip (22) is provided on the side of each outer fin (2), and the wing tip (22) is arranged at intervals along the spiral extension direction of the outer fin (2); and an internal thread rib (4) formed integrally with the tube body (1) is convexly provided on the inner surface of the tube body (1).

2. The external fin enhanced condenser according to claim 1, characterized in that: The wing tip (22) is a sharp protrusion, and the sharp portion of the sharp protrusion faces outside the tube body (1).

3. The external fin enhanced condenser according to claim 2, characterized in that: The wing tip (22) is arranged on one side or both sides of the outer fin (2).

4. The external fin enhanced condenser according to claim 3, characterized in that: One or more rows of wing tips (22) are arranged on one side of the outer fin (2).

5. The external fin enhanced condenser according to claim 4, characterized in that: The wing tips (22) are arranged in two rows on one side of the outer fin (2), and the two rows of wing tips (22) are arranged staggered or correspondingly.

6. The external fin enhanced condenser according to claim 1, characterized in that: The spiral groove (3) is wide at the top and narrow at the bottom.

7. The external fin enhanced condenser according to claim 1, characterized in that: The opening direction of the wing top groove (21) is arranged to intersect with the direction of the spiral groove (3), and the wing top groove (21) is communicated with the spiral groove (3).

8. The external fin enhanced condenser according to claim 1, characterized in that: The wing top grooves (21) on two adjacent outer fins (2) are interconnected.

9. The external fin enhanced condenser according to claim 1, characterized in that: The gap between two adjacent internal thread ribs (4) forms an internal thread groove (41).

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