Heat exchange tube for condenser

Abstract

The utility model relates to a heat exchange tube for a condenser, which comprises a tube body and an outer fin, wherein the outer fin is formed by extending a material on the tube body along the radius direction of the tube body and spirally extending on the outer surface of the tube body around the tube body, and the outer fin and the tube body are integrally formed; the thicknesses of the two sides of each outer fin are gradually reduced outwards in the radius direction of the pipe body, a gap between every two adjacent outer fins forms a first groove channel, and the outer fins are further provided with second groove channels which are staggered with the first groove channels and communicated with the first groove channels in the circumferential direction of the pipe body. An internal thread rib integrally formed with the tube body is arranged on the inner surface of the tube body in a protruding mode, at least one fin top groove is formed in the top end of each outer fin, and the forming direction of the fin top grooves intersects with the trend of the first groove channels and the trend of the second groove channels. By improving the inner and outer peripheral surface structures of the tube body, the heat exchange efficiency inside and outside the tube is optimized and combined, and the overall heat exchange performance of the heat exchange tube is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of condensation heat exchange in air-conditioning and refrigeration systems, in particular to a heat exchange tube for a condenser. Background Art

[0002] The study of condensation heat transfer mechanism shows that the thermal resistance of the liquid film is the main part of the condensation heat transfer resistance. Therefore, the key to strengthening condensation is to reduce the thickness of the condensate film as much as possible. To reduce the thickness of the condensate film, the following two factors must be taken into account: First, a special extended surface is formed on the heat exchange surface to change the surface tension distribution of the liquid film. Under the action of surface tension, the condensate accumulates in the groove formed on the extended surface. Although the heat transfer of the groove is weakened, the thickness of the liquid film at the sharp part of the extended surface becomes very thin, and the heat transfer effect is significantly improved. Therefore, the overall heat transfer performance is effectively improved; second, try to increase the drainage speed of the extended surface to avoid the extended surface being blocked by the condensate. The principle is to either use a sharp extended surface to reduce the retention effect of surface tension on the droplets, or use the groove to guide the accumulation of condensate to increase the effect of gravity on the droplet detachment, thereby accelerating the droplet detachment. It is based on this research that the industry has been committed to exploring the surface structure of the heat exchange tube used in the condenser to further improve the heat transfer coefficient of the condensation heat exchange of the heat exchange tube. Utility Model Content

[0003] The utility model aims to provide a heat exchange tube for a condenser, which solves the problem of how to improve the heat exchange efficiency of the condenser.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The utility model provides an evaporative heat exchange tube, characterized in that it comprises a tube body and an outer fin formed integrally with the tube body and extending from a 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 outer fin gradually decreases outward along the radial direction of the tube body, the gap between two adjacent outer fins constitutes a first groove, the outer fin is also provided with a second groove which is both staggered with the first groove and connected with the first groove along the circumferential direction of the tube body, an internal threaded rib formed integrally with the tube body is convexly provided on the inner surface of the tube body, at least one wing top groove is provided on the top of the outer fin, and the opening direction of the wing top groove is arranged to intersect with the direction of the first groove and the second groove.

[0006] Furthermore, the depth of the first groove is consistent with the depth of the second groove.

[0007] Furthermore, the first groove and the second groove are wider at the top and narrower at the bottom.

[0008] Furthermore, the gap between two adjacent internal thread ribs constitutes an internal thread groove.

[0009] Furthermore, the wing top groove is communicated with both the first groove and the second groove.

[0010] Furthermore, the directions of the wing top grooves are consistent.

[0011] Furthermore, the wing top grooves are arranged at intervals along the spiral extension direction of the outer fins, so that at least one wing tip structure is formed on the top of the outer fins.

[0012] Furthermore, the wing top grooves on two adjacent outer fins are interconnected.

[0013] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0014] The utility model discloses a heat exchange tube for a condenser, in which an outer fin and a tube body are integrally formed, thereby eliminating the contact thermal resistance between the two; and because the thickness of both sides of the outer fin decreases in the outward direction, it is beneficial to increase the tension of the condensate film outside the tube, thereby reducing the thickness of the liquid film; the grooves provided at the top ends of the outer fins are beneficial to destroying the surface tension of the condensate film, reducing the thickness of the condensate film, thereby reducing the thermal resistance, and at the same time the heat exchange area is effectively increased, thereby further improving the heat exchange effect outside the tube; and the staggered and interconnected arrangement of the first groove and the second groove reduces the unit weight of the heat exchange tube, and is also beneficial to accelerating the drainage speed of the condensate, thereby improving the heat exchange effect of the condensate tube; and the opening direction of the wing top groove is arranged to cross the direction of the first groove and the second groove, thereby making it easier for the coolant to be discharged from the tube body; the internal threaded ribs provided 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 heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a heat exchange tube for a condenser provided by the utility model;

[0017] Figure 2 This is a top view of a heat exchange tube for a condenser provided by the utility model;

[0018] Figure 3 This is a front view of a heat exchange tube for a condenser provided by the utility model;

[0019] Figure 4 It is a right side view of a heat exchange tube for a condenser provided by the utility model.

[0020] The reference numerals are described as follows:

[0021] 1. Tube body; 2. External fin; 21. Fin top groove; 22. Fin tip; 3. First groove; 4. Second groove; 5. Internal thread rib; 51. Internal thread groove. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1 The three-dimensional structural diagram of a heat exchange tube for a condenser shown is a portion of a heat exchange tube for a condenser cut out, which includes a tube body 1, and external fins 2 and internal threaded ribs 5 integrally formed with the tube body 1.

[0024] 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 formed by extruding 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. The thickness of both sides of the outer fin 2 gradually decreases outward along the radial direction of the tube body 1, that is, the bottom thickness of the outer fin 2 is greater than the top thickness.

[0025] like Figure 2 As shown, the gap between two adjacent outer fins 2 constitutes a first groove 3, and each first groove 3 is interconnected. At the same time, the outer fin 2 is also provided with a second groove 4 arranged along the circumferential direction of the tube body 1, and the second groove 4 is both staggered with the aforementioned first groove 3 and connected with the first groove 3. The grooves are staggered and connected with each other, which can reduce the unit weight of the heat exchange tube on the one hand, and accelerate the drainage speed of the condensate on the other hand, thereby improving the heat exchange effect outside the tube of the condenser tube. The depths of the aforementioned first groove 3 and the second groove 4 are consistent, and both grooves are set to a structure that is wide at the top and narrow at the bottom.

[0026] like Figure 3 and Figure 4As shown, at least one wing top groove 21 is provided at the top of the outer fin 2, and only one or two may be provided, thereby forming a plurality of gaps at the wing top, which is beneficial to further promote the flow of condensate, reduce the thickness of the liquid film, reduce the thermal resistance outside the tube, and effectively increase the heat exchange area, thereby further improving the heat exchange effect outside the tube. In addition, the opening direction of the wing top groove 21 and the direction of the aforementioned first groove 3 and second groove 4 are cross-set, that is, the direction of the wing top groove 21 and the direction of the first groove 3 and second groove 4 are mutually staggered, and the wing top groove 21 and the first groove 3 and second groove 4 are all connected.

[0027] In addition, the directions of the wing top grooves 21 are consistent. The wing top grooves 21 on two adjacent outer fins 2 are interconnected, which is conducive to the discharge of coolant from the tube body. The wing top grooves 21 are also spaced apart along the spiral extension direction of the outer fin 2, so that at least one wing tip 22 is formed on the top of the outer fin 2.

[0028] The inner surface of the tube body 1 is provided with an internal thread rib 5, and the gap between two adjacent internal thread ribs 5 forms an internal thread groove 51. 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 heat exchange tube for the condenser in this example is formed as an integral body of the tube body 1 and the outer fin 2 to reduce energy loss during heat transfer; at the same time, a wing top groove 21 is provided on the top of the outer 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 5, 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 utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A heat exchange tube for a condenser, characterized in that: The invention comprises 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 decreases outward along the radial direction of the tube body (1), the gap between two adjacent outer fins (2) forms a first groove (3), the outer fin (2) is also provided with a second groove (4) along the circumferential direction of the tube body (1) which is both staggered with the first groove (3) and connected with the first groove (3), the inner surface of the tube body (1) is provided with an internal thread rib (5) formed integrally with the tube body (1), the top of the outer fin (2) is provided with at least one wing top groove (21), and the opening direction of the wing top groove (21) is arranged to intersect with the direction of the first groove (3) and the second groove (4).

2. A heat exchange tube for a condenser according to claim 1, characterized in that: The depth of the first groove (3) is consistent with the depth of the second groove (4).

3. The heat exchange tube for a condenser according to claim 1, characterized in that: The first groove (3) and the second groove (4) are wide at the top and narrow at the bottom.

4. The heat exchange tube for a condenser according to claim 1, characterized in that: The gap between two adjacent internal thread ribs (5) forms an internal thread groove (51).

5. The heat exchange tube for a condenser according to claim 1, characterized in that: The wing top groove (21) is in communication with both the first groove (3) and the second groove (4).

6. The heat exchange tube for a condenser according to claim 1, characterized in that: The directions of the wing top grooves (21) are consistent.

7. The heat exchange tube for a condenser according to claim 1, characterized in that: The wing top grooves (21) are arranged at intervals along the spiral extension direction of the outer fin (2), so that at least one wing tip (22) structure is formed on the top of the outer fin (2).

8. The heat exchange tube for a condenser according to claim 1, characterized in that: The wing top grooves (21) on two adjacent outer fins (2) are interconnected.

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