Improved condenser tube with external fins

Abstract

The utility model relates to an improved condensing pipe of outer fin, belong to evaporative heat exchange pipe technical field in air conditioner, refrigeration system, solved the problem that the liquid film thickness of existing condensing pipe is thicker, influences the heat transfer performance, including pipe body and outer fin piece, first spiral outer fin and second spiral outer fin interval setting, the clearance between first spiral outer fin and second spiral outer fin constitutes fin channel, the radial height of first spiral outer fin is lower than the radial height of second spiral outer fin, the top of first spiral outer fin is provided with fin top groove along the spiral direction, the width of both sides wall of fin top groove gradually reduces from inside to outside along the radial height until top is set to be sharp, still include the cross groove of intercommunication adjacent two fin channel, and the cross groove extends around the pipe body in spiral state, have reduced the surface tension to the retention of liquid drop that produces, utilize the channel to guide condensate to accumulate to increase the effect of gravity to liquid drop and separate, thereby accelerate the separation of liquid drop, improve the heat transfer effect outside the pipe.

Description

Technical Field

[0001] This utility model belongs to the technical field of evaporative heat exchange tubes in air conditioning and refrigeration systems, and specifically relates to an improved condenser tube with external fins. Background Technology

[0002] Studies on the condensation heat transfer mechanism have shown that the thermal resistance of the liquid film is the main component of the condensation heat transfer resistance. Therefore, the key to enhancing condensation is to minimize the thickness of the condensate liquid film. Reducing the condensate liquid film thickness requires considering two factors: First, forming a special extended surface on the heat exchange surface to change the surface tension distribution of the liquid film. Under the influence of surface tension, the condensate accumulates in the grooves formed on the extended surface. Although the heat transfer in the grooves is weakened, the thickness of the liquid film at the sharp points of the extended surface becomes very thin, significantly improving the heat transfer effect and thus effectively enhancing the overall heat transfer performance. Second, increasing the drainage rate of the extended surface to prevent it from becoming clogged with condensate. This can be achieved either by using a sharp extended surface to reduce the retention effect of surface tension on the droplets, or by using channels to guide the accumulation of condensate to increase the effect of gravity on droplet detachment, thereby accelerating droplet detachment. Based on this research, the industry has been committed to exploring the surface structure of heat exchange tubes used in condensers to further improve the heat transfer coefficient of condensation heat transfer.

[0003] The purpose of this invention is to provide an improved condenser tube with external fins that can reduce the liquid film thickness of the condensate and improve the heat exchange performance. Utility Model Content

[0004] The purpose of this invention is to provide an improved condenser tube with external fins, which solves the problem that the existing condenser tube has a thick liquid film inside, affecting heat exchange performance.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an improved condenser tube with external fins, including a tube body and an external fin integrally formed by a material on the tube body extending radially along the outer surface of the tube body and spirally extending around the tube body. The external fin includes a first spiral external fin and a second spiral external fin, which are spaced apart. The gap between adjacent first and second spiral external fins forms a fin channel. The radial height of the first spiral external fin is lower than that of the second spiral external fin. The top of the first spiral external fin has a fin top groove along the spiral direction. The width between the inner and outer sidewalls of the fin top groove gradually decreases radially from the inside to the outside until the top is pointed. The tube also includes a cross channel connecting two adjacent fin channels, which extends spirally around the tube body.

[0006] Furthermore, the circumferential width of the second spiral outer fin gradually decreases radially from the inside to the outside, and the axial width of the second spiral outer fin also gradually decreases radially from the inside to the outside until the top is pointed.

[0007] Furthermore, the circumferential width of the first helical outer fin gradually decreases vertically from the inside to the outside along the radial direction, while the axial width of the first helical outer fin is consistent from the inside to the outside along the radial direction.

[0008] Furthermore, the number of the intersecting channels is multiple and they are evenly distributed along the circumference of the pipe body.

[0009] Furthermore, the cross-sectional shape of the fin top groove is V-shaped.

[0010] Furthermore, the inner surface of the tube body is provided with an internally threaded rib that is integral with the tube body, and the gap between two adjacent internally threaded ribs forms an internally threaded groove.

[0011] Furthermore, the width of the internal thread groove gradually increases radially from the outside to the inside.

[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model discloses an improved condenser tube with external fins, comprising a tube body and an external fin integrally formed by a material on the tube body extending radially along the outer surface of the tube body and spirally extending around the tube body. The external fin includes a first spiral external fin and a second spiral external fin, which are spaced apart. The gap between adjacent first and second spiral external fins forms a fin channel. The radial height of the first spiral external fin is lower than that of the second spiral external fin. The top of the first spiral external fin has a fin top groove along the spiral direction. The width of the two side walls of the fin top groove gradually decreases radially from the inside to the outside until the top is pointed. By setting the radial height of the first spiral outer fin to be less than that of the second spiral outer fin, and by using fin channels and cross channels to divide the continuous first and second spiral outer fins into several fin tips, the heat exchange surface area can be further increased and the weight of the tube can be reduced. In addition, several sharp structures of different heights can be formed on the outer surface of the tube, reducing the retention of droplets due to surface tension. The channels guide the accumulation of condensate to increase the effect of gravity on droplet detachment, thereby accelerating the detachment of droplets and further improving the heat exchange effect outside the tube. Attached Figure Description

[0013] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a partial enlarged view of the condenser tube according to a preferred embodiment of the present invention; Figure 2 This is a front view of a preferred embodiment of the present invention; Figure 3 This is a top view of a preferred embodiment of the present invention.

[0014] The reference numerals in the attached figures are explained as follows: 1. Tube body; 2. Outer fin; 21. First spiral outer fin; 22. Second spiral outer fin; 3. Fin channel; 4. Fin top channel; 5. Cross channel; 6. Internal thread rib; 7. Internal thread groove. Detailed Implementation

[0015] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] refer to Figure 1 , Figure 2 and Figure 3This utility model provides an improved condenser tube with external fins, comprising a tube body 1 and an external fin 2 integrally formed with the tube body 1, which is formed by material on the tube body 1 extending along the radial direction of the tube body 1 and spirally extending around the outer surface of the tube body 1. The external fin 2 includes a first spiral external fin 21 and a second spiral external fin 22, which are spaced apart, and the gap between adjacent first spiral external fins 21 and second spiral external fins 22 forms a fin channel 3. The radial height of the first helical outer fin 21 is lower than the radial height of the second helical outer fin 22. The top of the first helical outer fin 21 has a fin top groove 4 along the helical direction. The cross-sectional shape of the fin top groove 4 is V-shaped. The width between the inner and outer sidewalls of the fin top groove 4 in the axial direction gradually decreases radially from the inside to the outside until it reaches a pointed top. The circumferential width of the first helical outer fin 21 gradually decreases vertically from the inside to the outside in the radial direction, while the axial width remains consistent from the inside to the outside in the radial direction. The circumferential width of the second helical outer fin 22 gradually decreases radially from the inside to the outside, and the axial width also gradually decreases radially from the inside to the outside until it reaches a pointed top.

[0019] refer to Figure 1 , Figure 2 and Figure 3 It also includes a cross channel 5 connecting two adjacent fin channels 3, and the cross channel 5 extends spirally around the tube body 1. There are multiple cross channels 5, which are evenly distributed along the circumference of the tube body 1. The cross channels 5 divide the first spiral outer fin 21 and the second spiral outer fin 22, which are in a continuous structure, into several fin tip structures of different heights.

[0020] refer to Figure 1 , Figure 2 and Figure 3 The inner surface of the tube body 1 is provided with an internally threaded rib 6 that is integral with the tube body 1. The gap between two adjacent internally threaded ribs 6 forms an internally threaded groove 7. The width of the internally threaded groove 7 gradually increases from the outside to the inside along the radial direction.

[0021] refer to Figure 1 , Figure 2 and Figure 3 The beneficial effects of the improved finned condenser tube in this example are: 1. Both the first spiral outer fin 21 and the second spiral outer fin 22 are integral with the tube body 1. This structure ensures that there is no contact thermal resistance. 2. The fin top groove 4 provided at the top of the first spiral outer fin 21 is conducive to breaking the surface tension of the condensate film, reducing the thickness of the condensate film, thereby reducing the external thermal resistance of the tube, and at the same time effectively increasing the heat exchange area. Third, by setting the radial height of the first spiral outer fin 21 to be less than the height of the second spiral outer fin 22, and by using the fin channels 3 and the cross channels 5 to divide the continuous first spiral outer fin 21 and second spiral outer fin 22 into several fin tips, the heat exchange surface area can be further increased and the weight of the tube can be reduced. In addition, several sharp structures of different heights can be formed on the outer surface of the tube body 1, which reduces the retention of droplets caused by surface tension. The channels guide the accumulation of condensate to increase the effect of gravity on the detachment of droplets, thereby accelerating the detachment of droplets and further improving the heat exchange effect outside the tube. IV. The inner surface of the tube body 1 is provided with internal thread ribs 6, which helps to thin the fluid boundary layer inside the tube, enhance the turbulence of the fluid inside the tube body 1, reduce the thermal resistance of heat exchange inside the tube, increase the heat exchange area inside the tube, and improve the heat transfer coefficient inside the tube.

[0022] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. An improved condenser tube with external fins, characterized in that, The device includes a tube (1) and an outer wing (2) integral with the tube (1), formed by material on the tube (1) extending along the radial direction of the tube (1) and spirally extending around the outer surface of the tube (1). The outer wing (2) includes a first spiral outer wing (21) and a second spiral outer wing (22). The first spiral outer wing (21) and the second spiral outer wing (22) are spaced apart, and adjacent first spiral outer wing (21) and second spiral outer wing (22) are... The gap between them forms a fin channel (3). The radial height of the first spiral outer fin (21) is lower than the radial height of the second spiral outer fin (22). The top of the first spiral outer fin (21) is provided with a fin top groove (4) along the spiral direction. The width between the inner and outer sidewalls of the fin top groove (4) in the axial direction gradually decreases from the inside to the outside along the radial direction until the top is pointed. It also includes a cross channel (5) connecting two adjacent fin channels (3). The cross channel (5) extends around the tube body (1) in a spiral state.

2. The improved condenser tube with external fins according to claim 1, characterized in that, The width of the second spiral outer fin (22) in the circumferential direction gradually decreases from the inside to the outside along the radial direction, and the width of the second spiral outer fin (22) in the axial direction also gradually decreases from the inside to the outside along the radial direction until the top is pointed.

3. The improved condenser tube with external fins according to claim 1, characterized in that, The circumferential width of the first spiral outer fin (21) gradually decreases vertically from the inside to the outside along the radial direction, while the axial width of the first spiral outer fin (21) is consistent from the inside to the outside along the radial direction.

4. The improved condenser tube with external fins according to claim 1, characterized in that, The number of the cross channels (5) is multiple and they are evenly distributed along the circumference of the pipe body (1).

5. The improved condenser tube with external fins according to claim 1, characterized in that, The cross-sectional shape of the wing top groove (4) is V-shaped.

6. The improved condenser tube with external fins according to claim 1, characterized in that, The inner surface of the tube (1) is provided with an internal thread rib (6) that is integral with the tube (1), and the gap between two adjacent internal thread ribs (6) forms an internal thread groove (7).

7. The improved condenser tube with external fins according to claim 6, characterized in that, The width of the internal thread groove (7) gradually increases radially from the outside to the inside.

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