CN111854502A

CN111854502A - Heat exchange tube and air conditioning unit

Info

Publication number: CN111854502A
Application number: CN202010652830.8A
Authority: CN
Inventors: 刘华; 胡东兵; 胡海利; 岳清学
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2020-10-30

Abstract

The application provides a heat exchange tube and an air conditioning unit. The heat exchange tube comprises a tube body and a plurality of fins arranged on the outer side of the tube body, a flow channel is formed between every two adjacent fins, and a plurality of convex fin structures are formed on the fins. And a communicating groove is formed between the roots of two adjacent convex fin structures on the fin and is used for communicating the flow channel. By applying the technical scheme of the invention, the fins are provided with the plurality of convex fin structures, so that the heat exchange area can be increased, the surface tension of a liquid film can be enhanced, the condensed liquid film can be stretched, and the condensate can be discharged. The communicating groove is formed between the roots of the two adjacent convex fin structures, condensate at the roots of the convex fin structures can be discharged to the flow channel in time, the phenomenon that the condensate is bridged between the roots of the two adjacent convex fin structures to block contact of a refrigerant and a pipe body is avoided, and therefore condensation efficiency of the heat exchange pipe is improved.

Description

Heat exchange tube and air conditioning unit

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to a heat exchange tube and an air conditioning unit.

Background

The horizontal shell-and-tube heat exchanger is an indispensable component in a central air-conditioning system, and the heat exchange performance of the horizontal shell-and-tube heat exchanger determines the energy efficiency of a centrifugal type refrigerating unit and a screw type refrigerating unit. In the condenser, the heat exchange tubes are horizontally arranged, and low-temperature fluid circulating in the tubes takes away heat of steam outside the tubes through the tube walls to promote the steam outside the tubes to be condensed. With the development of heat transfer equipment over the years, emphasis has been placed on developing more efficient condensing heat transfer surfaces, both in academia and in industrial applications. In the two modes of condensation, the heat exchange efficiency of bead condensation is much higher than that of film condensation, but the popularization and application of the bead condensation in the industry are hindered due to the processing cost and the maintainability of stable performance; film-like condensation has found widespread use in industry and has become the primary means of heat transfer for condensation in industrial applications because of the use of enhanced heat transfer surfaces, such as added fins.

However, under the condition of film-shaped condensation, the condensed liquid flows continuously after condensing into liquid, and the condensed liquid covers the outer surface of the heat exchange tube to form a liquid film which becomes the main thermal resistance. The heat transfer thermal resistance hinders the direct contact of the condensate liquid film with the steam and the pipe wall, and the thicker the liquid film is, the larger the thermal resistance is, and the worse the condensation heat transfer effect is. Therefore, in order to further improve the condensation heat transfer coefficient, the further enhancement of thinning the condensate film and promoting the condensate to be rapidly discharged are needed. Over decades of development, complex condensation surfaces have also been developed and widely used, commonly referred to as 3D fins. The 3D fin not only can increase the heat transfer area, but also can utilize the action of the surface tension of the liquid refrigerant to reduce the liquid film to promote the flow of the condensate. However, the common 3D fin does not better channel the condensate to flow away from the surface of the heat transfer tube, i.e., the liquid discharge speed is not increased, so that the liquid film cannot be significantly reduced, and the performance of the heat exchange tube for the condenser cannot be improved.

Disclosure of Invention

The embodiment of the invention provides a heat exchange tube and an air conditioning unit, and aims to solve the technical problem that the heat exchange tube in the prior art is low in condensation efficiency.

The embodiment of the application provides a heat exchange tube, including body and a plurality of fins of setting on the body outside, be formed with the runner between two adjacent fins, be formed with a plurality of protruding wing structures on the fin, seted up the intercommunication groove between the root of two adjacent protruding wing structures on the fin, the intercommunication groove is used for communicateing the runner.

In one embodiment, the communication groove communicates with the flow channels on both sides of the fin through the fin.

In one embodiment, the bottom of the flow passage is provided with a flow groove, and the flow groove extends along the extending direction of the flow passage.

In one embodiment, the communication channel is in communication with the flow channel.

In one embodiment, the communication groove is an arc-shaped groove or a polygonal groove.

In one embodiment, the flow-through channels are arcuate or polygonal channels.

In one embodiment, the direction of extension of the communication groove is arranged at an angle α to the axial direction of the tubular body, 90 ° < α < 180 °.

In one embodiment, the fins extend at an angle β to the axial direction of the tube, 85 ° ≦ β ≦ 89.9 °.

In one embodiment, the protruding fin structure is in the shape of a pointed top and a wide bottom.

In one embodiment, the protruding fin structure is triangular, the vertex angle of the triangular shape is gamma, and gamma is more than or equal to 10 degrees and less than or equal to 120 degrees.

In one embodiment, the heat exchange tube further comprises an inner rib structure disposed inside the tube body.

The application also provides an air conditioning unit, which comprises the heat exchange tube, wherein the heat exchange tube is the heat exchange tube.

In the above embodiment, the fin is provided with the plurality of convex fin structures, so that the heat exchange area can be increased, and the condensed liquid film can be stretched under the action of enhancing the surface tension of the liquid film, thereby facilitating the discharge of the condensed liquid. The communicating groove is formed between the roots of the two adjacent convex fin structures, condensate at the roots of the convex fin structures can be discharged to the flow channel in time, the phenomenon that the condensate is bridged between the roots of the two adjacent convex fin structures to block contact of a refrigerant and a pipe body is avoided, and therefore condensation efficiency of the heat exchange pipe is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic perspective view of an embodiment of a heat exchange tube according to the present invention;

FIG. 2 is an enlarged partial schematic view of the heat exchange tube of FIG. 1;

FIG. 3 is a schematic top view of the heat exchange tube of FIG. 2;

FIG. 4 is a schematic cross-sectional view of the heat exchange tube of FIG. 3;

fig. 5 is a schematic longitudinal sectional view of the heat exchange tube of fig. 3.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

The existing condensation heat transfer mode mainly takes film-shaped condensation as a main mode, and a liquid film formed after steam is condensed covers the outer surface of a heat transfer pipe and becomes main thermal resistance for hindering heat transfer. For this reason, in the technical solution of the present invention, as shown in fig. 1 and 2, the heat exchange tube includes a tube body 10 and a plurality of fins 20 disposed on the outer side of the tube body 10, a flow channel a is formed between two adjacent fins 20, and a plurality of convex fin structures 21 are formed on the fins 20. A communication groove 22 is formed between the roots of two adjacent convex fin structures 21 on the fin 20, and the communication groove 22 is used for communicating the flow channel a.

By applying the technical scheme of the invention, the plurality of convex fin structures 21 formed on the fins 20 can increase the heat exchange area on one hand, and can play a role in enhancing the surface tension of the liquid film and stretching the condensed liquid film on the other hand, thereby being beneficial to discharging the condensate. The communicating groove 22 is formed between the roots of the two adjacent convex fin structures 21, condensate at the roots of the convex fin structures 21 can be discharged to the flow channel a in time, the phenomenon that the condensate is bridged between the roots of the two adjacent convex fin structures 21 to block the contact between the refrigerant and the pipe body 10 is avoided, and further the condensation efficiency of the heat exchange pipe is improved.

Preferably, in the solution of the present embodiment, the communication groove 22 passes through the fin 20 and communicates with the flow channels a on both sides of the fin 20. Thus, the adjacent flow passages a are communicated through the communication groove 22, the communication between the adjacent flow passages a is enhanced, and more refrigerant can flow along with condensate dripping between the adjacent fins.

As shown in fig. 3 and 4, as a more preferable embodiment, a flow groove a1 is formed at the bottom of the flow path a, and the flow groove a1 extends in the extending direction of the flow path a. Can also accelerate the flow of condensate at the root of fin 20 through circulation groove a1, can dredge the condensate and flow away fast along the heat exchange tube surface to avoid the refrigerant to be detained between fin 20, guarantee that heat exchange tube and refrigerant steam area of contact reduce, thereby make condensation heat exchange efficiency further improve. It should be noted that, for different refrigerants, the fin pitch, the depth of the circulation groove a1, and other dimensions can be properly adjusted according to different working conditions, so as to meet the requirement of heat exchange efficiency.

As shown in fig. 2, as a more preferred embodiment, the communication groove 22 communicates with the flow groove a 1. Thus, the condensate discharged from the root of the fin structure 21 can directly enter the circulation groove a1, and the circulation of the condensate on the surface of the heat exchange tube is facilitated.

As an alternative embodiment, in the solution of the present embodiment, as shown in fig. 5, the communication groove 22 is an arc-shaped groove, and as shown in fig. 4, the flow groove a1 is a rectangular groove. As other alternative embodiments, the communication groove 22 and the flow passage a1 may be arc-shaped grooves or polygonal grooves with other shapes, and the polygonal grooves may be v-shaped grooves or trapezoidal grooves.

As shown in fig. 3, in the present embodiment, the extending direction of the communication groove 22 is set at an angle α with respect to the axial direction of the pipe body 10, and 0 ° < α < 180 °. More preferably, the extending direction of the fins 20 is set at an angle β with the axial direction of the tube body 10, and β is greater than or equal to 85 ° and less than or equal to 89.9 °.

Alternatively, as shown in fig. 2, in the technical solution of the present embodiment, the protruding fin structure 21 is in a shape with a pointed top and a wide bottom. More preferably, in the technical solution of this embodiment, the protruding fin structure 21 is triangular, and the vertex angle of the triangular shape is γ, and γ is greater than or equal to 10 ° and less than or equal to 120 °.

As shown in fig. 2, in the solution of the present embodiment, the heat exchange tube further includes an inner rib structure 30 provided inside the tube body 10. Optionally, the inner rib structure 30 is a trapezoidal structure.

The above structure of the present invention can refer to the following parameters:

1. the communicating grooves 22 are distributed along the circumferential direction of the pipe body 10, and the number of the communicating grooves is 10-150.

2. The height of the protruding fin structure 21 from the top to the base body of the tube body 10 is not H2, and H2 is 0.1-3.5 mm. The sharp fins are distributed along the circumferential direction, and the number of the sharp fins is 10-150.

3. The width of the circulation groove a1 accounts for 10-99% of the width of the flow channel a, and the depth H1 is 0.05-0.3 mm.

4. The inner rib structure 30 is an inverted trapezoid structure or a triangular structure, the number of heads of the inner rib structure 30 is 5-85 in number along the circumferential direction, and the height of the inner rib is 0.1-0.65 mm

The heat exchange tube of the invention is processed by a special roller mill, a pressure processing chipless forming technology is adopted, and a threaded die is adopted in the tube to line a core tube and a combined die is adopted to carry out one-time extrusion processing outside the tube. The processing technology ensures that the heat exchange tube fins and the inner ribs are self-integrated, ensures high-efficiency heat exchange, and simultaneously ensures the strength of the fins 20 and the inner rib structure 30

The invention also provides an air conditioning unit which comprises the heat exchange tube, and the air conditioning unit adopting the heat exchange tube can effectively improve the condensation efficiency and further increase the heat exchange efficiency of the air conditioning unit.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The heat exchange tube comprises a tube body (10) and a plurality of fins (20) arranged on the outer side of the tube body (10), flow channels (a) are formed between every two adjacent fins (20), a plurality of convex fin structures (21) are formed on the fins (20), and the heat exchange tube is characterized in that a communication groove (22) is formed between the roots of every two adjacent convex fin structures (21) on the fins (20), and the communication groove (22) is used for communicating the flow channels (a).

2. The heat exchange tube according to claim 1, wherein the communication groove (22) communicates with the flow channel (a) on both sides of the fin (20) through the fin (20).

3. The heat exchange tube of claim 1, characterized in that the bottom of the flow channel (a) is provided with a flow groove (a1), and the flow groove (a1) extends along the extending direction of the flow channel (a).

4. A heat exchange tube according to claim 3, characterized in that said communication groove (22) communicates with said flow groove (a 1).

5. The heat exchange tube according to claim 1, wherein the communication groove (22) is an arc-shaped groove or a polygonal groove.

6. A heat exchange tube according to claim 3, characterized in that the flow channels (a1) are arc-shaped or polygonal channels.

7. A heat exchange tube according to claim 1, wherein the communication groove (22) extends at an angle α to the axial direction of the tube body (10), 90 ° < α < 180 °.

8. A heat exchange tube according to claim 1, characterized in that the fins (20) extend in a direction at an angle β to the axial direction of the tube body (10), 85 ° ≦ β ≦ 89.9 °.

9. A heat exchange tube according to claim 1, characterized in that the convex fin structure (21) is in the shape of a pointed top and a wide bottom.

10. A heat exchange tube according to claim 9, characterized in that the projecting fin structure (21) is triangular in shape with a vertex angle γ of 10 ° ≦ γ ≦ 120 °.

11. A heat exchange tube according to claim 1, further comprising an inner rib structure (30) provided inside the tube body (10).

12. An air conditioning assembly comprising a heat exchange tube, wherein the heat exchange tube is as claimed in any one of claims 1 to 11.