Heat exchange tube for heat pump assembly

Abstract

The heat exchange tube for the heat pump assembly comprises a tube body and outer fins installed on the outer side of the tube body, three-dimensional horizontal fins are arranged in the middles of the outer fins, flow guide grooves and sharp structures are arranged on the upper portions of the outer fins, and annular grooves are formed in the side walls of the outer fins and between every two adjacent outer fins of the tube body. When the formed condensation liquid flows on the side walls of the outer fins or the side wall of the pipe body, the annular grooves enable the condensation liquid not to form a wrapping structure between the side walls of the outer fins and the outer wall of the pipe body, and the surface tension of the condensation liquid is reduced. Condensation liquid can overcome surface tension to freely fall on the side walls of the outer fins and the outer wall of the pipe body under the action of gravity, and the situation that the condensation liquid forms a liquid film on the surface of the pipe body to affect heat exchange during condensation heat exchange is avoided.

Description

Technical Field

[0001] This application relates to the technical field of tubes and their components with structures that increase heat transfer area, such as tubes with fins, protrusions or grooves, and specifically to a heat exchange tube for a heat pump assembly. Background Technology

[0002] Heat exchange tubes are one of the components of a heat exchanger, located inside the shell, and are used for the exchange of heat between two media. They have high thermal conductivity and good isothermal properties. Heat pump units provide heating and cooling, and the heat exchange tubes used in these units need to be able to achieve both evaporation and condensation heat exchange efficiently. Therefore, the heat exchange tubes used in heat pump units are equipped with both evaporation and condensation structures.

[0003] Since the outer fins on the heat exchange tube are arranged sequentially at intervals along its axial direction, when the heat exchange tube achieves condensation heat exchange, the gaseous working medium outside the heat exchange tube comes into contact with the condensate and exchanges heat, and condenses into liquid. The condensate is discharged from the channel between two adjacent outer fins.

[0004] When the condensate is discharged through the channel between the two outer fins, it falls along the outer wall of the heat exchange tube under the action of gravity. However, in actual applications, the condensate will adhere to the heat exchange tube and the lower part of the outer fins under the action of gravity and the surface tension of the heat exchange tube, forming a liquid film, which affects the heat exchange efficiency of the heat exchange tube during condensation. Summary of the Invention

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a heat exchange tube for a heat pump assembly, and the technical solution adopted includes:

[0006] A heat exchange tube for a heat pump assembly includes a tube body and outer fins installed on the outside of the tube body. The outer fins have three-dimensional horizontal fins in the middle, and the upper part of the outer fins has a flow guide groove and a sharp structure. The sidewalls of the outer fins and the tube body have annular grooves between two adjacent outer fins.

[0007] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the width of the groove opening of the annular groove is less than or equal to the width of its bottom.

[0008] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the cross-section of the annular groove is trapezoidal.

[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the width of the annular groove is 0.05 to 0.1 mm, and the distance between two adjacent annular grooves is 0.05 to 0.08 mm.

[0010] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the depth of the annular groove is 0.01 to 0.2 mm.

[0011] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the two side walls of the annular groove are connected to the outer side wall of the tube or the side wall of the outer fin by an arc transition.

[0012] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the sharp structure includes a plurality of horizontal pieces disposed on the side of the outer fin, the cross section of the horizontal pieces is triangular, and the end of the horizontal piece away from the outer fin is an acute angle.

[0013] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the sharp structure includes a vertical piece disposed at the top of the outer fin, and the upper end of the vertical piece is an acute angle.

[0014] The beneficial effects of this utility model are as follows: When the condensate flows on the side wall of the outer fin or the side wall of the tube after it is formed, the annular groove prevents the condensate from forming an encapsulated structure between the side wall of the outer fin and the outer wall of the tube, reducing the surface tension of the condensate. This allows the condensate to overcome the surface tension and fall freely under the action of gravity on the side wall of the outer fin and the outer wall of the tube, avoiding the formation of a liquid film on the surface of the tube during condensation heat exchange, which would affect heat exchange. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of the structure of the heat exchange tube for the heat pump assembly described in this embodiment;

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 This is a cross-sectional view of the heat exchange tubes used in the heat pump assembly described in this embodiment. Detailed Implementation

[0019] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0020] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0022] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figure 1-3 The present application proposes an embodiment of the heat exchange tube for the heat pump assembly, which includes a tube body 10 and an outer fin 20 installed on the outside of the tube body 10. The outer fin 20 has a three-dimensional horizontal fin 30 in the middle, a guide groove 21 and a sharp structure 40 on the upper part of the outer fin 20, and an annular groove 50 between two adjacent outer fins 20 on the side wall of the outer fin 20 and the tube body 10.

[0024] During condensation, the gaseous heat exchange medium flows along the tube 10 and exchanges heat with the three-dimensional horizontal fins 30 to form condensate. The condensate falls through the channel between the two outer fins 20. Referring to the attached figure, on the one hand, after the condensate is formed, when it flows on the side wall of the outer fin 20 or the side wall of the tube 10, the annular groove 50 prevents the condensate from forming a wrapped structure between the side wall of the outer fin 20 and the outer wall of the tube 10, reducing the surface tension of the condensate. This allows the condensate to overcome the surface tension under the action of gravity and fall freely, avoiding the formation of a liquid film on the tube surface during condensation heat exchange, which would affect heat exchange. On the other hand, the annular groove 50 increases the surface area of ​​the outer fins 20 and the tube 10, which is beneficial for improving heat exchange efficiency.

[0025] During evaporation, the liquid heat exchange medium flows along the tube body 10. The sharp structure 40 pierces the liquid film, causing the refrigerant droplets to fall down along the outer fins 20 and vaporize after contacting the outer wall of the heat exchange tube body 10. When the heat exchange tube is used as an evaporation tube, the annular groove 50 increases the vaporization nuclei on the surface of the heat exchange tube body 10, thereby generating more bubbles, which is beneficial to improving heat exchange efficiency.

[0026] In this embodiment, the width of the opening of the annular groove 50 is less than or equal to the width of its bottom; specifically, in this embodiment, the cross-section of the annular groove 50 is trapezoidal, so as to make the space inside the annular groove 50 larger, which is conducive to the discharge of condensate inside the annular groove 50.

[0027] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: the width of the annular groove 50 is 0.05-0.1mm, the distance between two adjacent annular grooves 50 is 0.05-0.08mm, and the depth of the annular groove 50 is 0.01-0.2mm.

[0028] Since the distance between two adjacent fins on the heat exchange tube body 10 is about 0.8 mm, the width of the annular groove 50 is designed to be 0.05 to 0.1 mm, and the distance between two adjacent annular grooves 50 is controlled to be 0.05 to 0.08 mm, so that as many annular grooves 50 as possible are processed on the outer wall of the tube body 10 and the outer fins 20, ensuring that the condensate between two adjacent outer fins 20 can flow smoothly down between them.

[0029] The two side walls of the annular groove 50 are connected to the outer wall of the tube body 10 or the side wall of the outer fin 20 by an arc-shaped transition, so that the condensate can easily slide off.

[0030] In this embodiment, the sharp structure 40 includes a plurality of transverse pieces 41 disposed on the side of the outer fin 20. The cross-section of each transverse piece 41 is triangular, and the end of the transverse piece 41 away from the outer fin 20 is an acute angle.

[0031] The sharp structure 40 also includes a vertical blade 42 disposed at the top of the outer fin 20. The upper end of the vertical blade 42 is an acute angle. The vertical blade 42 and the horizontal blade 41 pierce the liquid working medium in the flow, causing it to fall along the side wall of the outer fin 20.

[0032] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A heat exchange tube for a heat pump assembly, characterized in that, It includes a tube body (10) and outer fins (20) installed on the outside of the tube body (10). The outer fins (20) have three-dimensional horizontal fins (30) in the middle. The upper part of the outer fins (20) has a guide groove (21) and a sharp structure (40). The sidewall of the outer fins (20) and the tube body (10) have annular grooves (50) between two adjacent outer fins (20).

2. The heat exchange tube for a heat pump assembly according to claim 1, characterized in that, The width of the opening of the annular groove (50) is less than or equal to the width of its bottom.

3. The heat exchange tube for a heat pump assembly according to claim 2, characterized in that, The cross-section of the annular groove (50) is trapezoidal.

4. The heat exchange tube for a heat pump assembly according to claim 2, characterized in that, The width of the groove opening of the annular groove (50) is 0.05 to 0.1 mm, and the distance between two adjacent annular grooves (50) is 0.05 to 0.08 mm.

5. The heat exchange tube for a heat pump assembly according to claim 4, characterized in that, The depth of the annular groove (50) is 0.01 to 0.2 mm.

6. The heat exchange tube for a heat pump assembly according to claim 1, characterized in that, The two sides of the annular groove (50) are connected to the outer side wall of the tube body (10) or the side wall of the outer fin (20) by an arc transition.

7. The heat exchange tube for a heat pump assembly according to claim 1, characterized in that, The sharp structure (40) includes a plurality of transverse blades (41) disposed on the side of the outer fin (20). The cross section of the transverse blades (41) is triangular, and the end of the transverse blades (41) away from the outer fin (20) is an acute angle.

8. The heat exchange tube for a heat pump assembly according to claim 1, characterized in that, The sharp structure (40) includes a vertical piece (42) disposed at the top of the outer fin (20), the upper end of the vertical piece (42) being an acute angle.

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