Heat exchange tubes, heat exchangers and air conditioners

Abstract

The present invention provides a heat exchange tube, a heat exchanger and an air conditioner. The heat exchange tube includes: a tube base; an outer rib structure is provided on the outer wall of the tube base, and a flow channel structure is provided on the outer rib structure. The flow channel structure is in a snowflake shape, and the flow channel structure is used to provide a vaporization core required for the evaporation of liquid refrigerant. The present invention provides a heat exchange tube, which solves the problem of uniform distribution of liquid refrigerant in the axial and circumferential directions of a falling film evaporator, improves the area utilization rate of the heat exchange tube, and further improves the heat exchange performance of the falling film evaporator. The snowflake-shaped inter-wing flow channels on the outer surface of the present invention form a series of uniform hole clusters and flow channels through cross gaps, providing a large amount of vaporization cores required for the evaporation of liquid saturated refrigerant, which makes the vaporization core density of the heat exchange tube in the embodiment of the present invention large, and significantly enhances the heat exchange efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange, and in particular relates to a heat exchange tube, a heat exchanger and an air conditioner. Background Art

[0002] In the falling film evaporator, the refrigerant drips down the evaporating tubes row by row. On the one hand, there must be enough refrigerant on the evaporating tubes to quickly enter the holes on the outer surface, so as to prevent the formation of dry spots on some surfaces due to insufficient refrigerant. On the other hand, it must be able to quickly extend axially and circumferentially on the outer surface of the tube to prevent too much refrigerant from accumulating on the tube surface, and to prevent splashing when the upper row of refrigerant continues to drip, so that part of the refrigerant cannot participate in heat exchange. At the same time, when the refrigerant drips from top to bottom, it must have a certain directionality to ensure that the refrigerant in the upper row of tubes drips right above the lower row of tubes, so that all the refrigerant can be used for heat exchange.

[0003] The surface of the full-liquid evaporator tube is smooth, which can only provide the vaporization core for evaporation, and cannot drain, extend, or stagnate the refrigerant. This means that the unique heat transfer form of falling film evaporation cannot be fully enhanced. Therefore, there is an urgent need for a falling film evaporator tube dedicated to falling film evaporator, which can provide the vaporization core required for nucleate boiling and enhance convective heat transfer. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing heat exchange tubes cannot meet the heat exchange form of falling film evaporation, and thus a heat exchange tube, a heat exchanger and an air conditioner are provided.

[0005] In order to solve the above problems, the present invention provides a heat exchange tube, comprising:

[0006] Tube substrate;

[0007] An outer rib structure is provided on the outer wall of the tube base, and a flow channel structure is provided on the outer rib structure. The flow channel structure includes a first flow channel, a second flow channel, and a third flow channel. The flow channel structure is used to provide a vaporization core required for evaporation of the liquid refrigerant.

[0008] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0009] Preferably, the first flow channel, the second flow channel and the third flow channel intersect and communicate with each other, and intersect to form a snowflake shape.

[0010] Preferably, the flow channel structure further includes a fifth flow channel, and the first flow channel, the second flow channel, the third flow channel and the fifth flow channel intersect and communicate with each other, and intersect to form a cross shape.

[0011] Preferably, there are multiple external rib structures, and the multiple external rib structures are arranged circumferentially along the outer wall of the tube substrate and extend spirally on the outer wall of the tube substrate along the axis of the tube substrate respectively, and the flow channel structures on the multiple external rib structures constitute a channel network.

[0012] Preferably, the flow channel structure comprises a first flow channel, and the first flow channel is arranged along the spiral direction of the outer rib structure.

[0013] Preferably, a plurality of outer rib structures are arranged at intervals, and a fourth flow channel is provided between adjacent outer rib structures, and the fourth flow channel is a spiral channel.

[0014] Preferably, an umbrella-shaped wing group is provided on the top of the outer rib structure, and the umbrella-shaped wing group includes six umbrella-shaped wings, and the six umbrella-shaped wings are respectively arranged at six angles of the flow channel structure.

[0015] Preferably, the six umbrella-shaped wings are respectively the first umbrella-shaped wing, the second umbrella-shaped wing, the third umbrella-shaped wing, the fourth umbrella-shaped wing, the fifth umbrella-shaped wing and the sixth umbrella-shaped wing, and the first umbrella-shaped wing, the second umbrella-shaped wing, the third umbrella-shaped wing and the fourth umbrella-shaped wing, the fifth umbrella-shaped wing and the sixth umbrella-shaped wing are symmetrical one by one along the first flow channel.

[0016] Preferably, the umbrella-shaped wing comprises an umbrella handle portion and an umbrella cover portion, the umbrella cover portion of the umbrella-shaped wing extends to cover above the flow channel structure, and / or the umbrella cover portion of the umbrella-shaped wing extends to cover above the fourth flow channel.

[0017] Preferably, 50-500 external rib structures are distributed along the circumference of the tube substrate, and / or, 10-70 flow channel structures are arranged per inch along the axis of the tube substrate, and / or, the height of the flow channel structure is 0.1-0.8 mm, and / or, the height of the fourth flow channel is 0.1-0.8 mm.

[0018] Preferably, the inner wall of the tube substrate is provided with an inner rib structure, there are multiple inner rib structures, and the multiple inner rib structures are arranged circumferentially along the inner wall of the tube substrate and extend spirally on the inner wall of the tube substrate along the axis of the tube substrate.

[0019] Preferably, the angle between the inner rib structure and the axis of the tube substrate is in the range of 10-75°, and / or the number of the inner rib structures distributed along the circumference of the tube substrate is 6-90, and / or the height of the inner rib structures is 0.1-0.6 mm.

[0020] A heat exchanger adopts any one of the above heat exchange tubes.

[0021] An air conditioner adopts any one of the above heat exchange tubes.

[0022] The heat exchange tube, heat exchanger and air conditioner provided by the present invention have at least the following beneficial effects:

[0023] The present invention provides a heat exchange tube, which solves the problem of uniform distribution of liquid refrigerant in the axial and circumferential directions of a falling film evaporator, improves the area utilization of the heat exchange tube, and further improves the heat exchange performance of the falling film evaporator. The snowflake-shaped or cross-shaped outer surface inter-wing flow channels of the present invention form a series of uniform hole clusters and flow channels through the cross gaps, providing a large amount of vaporization cores necessary for the evaporation of liquid saturated refrigerant, which makes the vaporization core density of the heat exchange tube of the embodiment of the present invention large, and significantly enhances the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a heat exchange tube according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 is a cross-sectional view of a heat exchange tube according to an embodiment of the present invention;

[0027] Figure 4 FIG. 4 is a top view of the outer rib structure according to an embodiment of the present invention.

[0028] The reference numerals are as follows:

[0029] 1. Tube base; 2. External rib structure; 3. Flow channel structure; 4. First flow channel; 5. Second flow channel; 6. Third flow channel; 7. Fourth flow channel; 8. Umbrella wing group; 9. First umbrella wing; 10. Second umbrella wing; 11. Third umbrella wing; 12. Fourth umbrella wing; 13. Fifth umbrella wing; 14. Sixth umbrella wing; 15. Internal rib structure; 16. Umbrella handle; 17. Umbrella cover. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding 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 making creative work are within the scope of protection of the present invention.

[0031] Combination Figures 1 to 4 As shown, a heat exchange tube includes: a tube base 1; an outer rib structure 2 is provided on the outer wall of the tube base 1, and a flow channel structure 3 is provided on the outer rib structure 2. The flow channel structure 3 includes a first flow channel 4, a second flow channel 5, and a third flow channel 6. The flow channel structure 3 is used to provide a vaporization core required for the evaporation of liquid refrigerant.

[0032] Since the existing full-liquid evaporator tubes do not have the surface distribution function, when directly used in the horizontal tube falling film evaporator, it is difficult to form a uniform and stable liquid film on the surface of the heat exchange tube, and local drying is prone to occur. The overall heat exchange efficiency is low, and the advantages of falling film evaporation heat exchange cannot be fully utilized. The present invention provides a new type of high-efficiency evaporator tube. Through the new design of the fin type on the surface of the heat exchange tube, on the premise of strengthening full-liquid evaporation, the problem of uniform distribution of liquid refrigerant in the axial and circumferential directions of the falling film evaporator is solved, and the area utilization rate of the falling film evaporator tube bundle is improved, thereby improving the heat exchange performance of the falling film evaporator. The multiple flow channels of the embodiment of the present invention cross-form a series of uniform hole clusters and flow channels, providing a large amount of vaporization cores necessary for the evaporation of liquid saturated refrigerant, which makes the vaporization core density of the heat exchange tube of the embodiment of the present invention large, and significantly enhances the heat exchange efficiency.

[0033] In this embodiment, the first flow channel 4, the second flow channel 5, and the third flow channel 6 intersect and communicate with each other, and intersect to form a snowflake shape, and also include a fifth flow channel, the first flow channel 4, the second flow channel 5, the third flow channel 6, and the fifth flow channel intersect and communicate with each other, and intersect to form a cross shape. The snowflake-shaped or cross-shaped flow channels can provide a large number of uniform vaporization cores. Among them, the snowflake shape in this application specifically refers to a hexagonal shape.

[0034] In this embodiment, there are multiple external rib structures 2, and the multiple external rib structures 2 are arranged circumferentially along the outer wall of the tube base 1, and extend spirally on the outer wall of the tube base 1 along the axis of the tube base 1 respectively, and the flow channel structures 3 on the multiple external rib structures 2 constitute a channel network.

[0035] In this embodiment, Figure 4 As shown by the dashed line, the flow channel structure 3 includes a first flow channel 4 , and the first flow channel 4 is arranged along the spiral direction of the outer rib structure 2 .

[0036] In this embodiment, an umbrella-shaped wing group 8 is provided on the top of the outer rib structure 2, and the umbrella-shaped wing group 8 includes six umbrella-shaped wings, and the six umbrella-shaped wings are respectively arranged at six angles of the flow channel structure 3. There is a cross gap between the umbrella-shaped wings in the axial direction, forming a small cavity for the circulation of refrigerant and evaporation, and at the same time, two high and low annular channels are formed along the spiral direction to form a circumferential gap flow channel.

[0037] In this embodiment, the six umbrella wings are respectively the first umbrella wing 9, the second umbrella wing 10, the third umbrella wing 11, the fourth umbrella wing 12, the fifth umbrella wing 13, and the sixth umbrella wing 14. The first umbrella wing 9, the second umbrella wing 10, the third umbrella wing 11 and the fourth umbrella wing 12, the fifth umbrella wing 13, and the sixth umbrella wing 14 are symmetrical one by one along the first flow channel 4.

[0038] In this embodiment, the umbrella wing includes an umbrella handle portion 16 and an umbrella cover portion 17. The umbrella handle portion 16 is connected to the tube base 1 as a whole through the external rib structure 2. The umbrella cover portion 17 of the umbrella wing extends to cover above the flow channel structure 3, and / or the umbrella cover portion 17 of the umbrella wing extends to cover above the fourth flow channel 7.

[0039] In this embodiment, a plurality of outer rib structures 2 are arranged at intervals, and a fourth flow channel 7 is provided between adjacent outer rib structures 2 . The fourth flow channel 7 is a spiral channel.

[0040] Thus, the spiral channel formed by the spiral connection along the circumferential direction below the umbrella-shaped wing group 8 is conducive to the circumferential flow of the refrigerant, and combined with the fourth flow channel 7 between the outer rib structure 2, a cross flow channel network is formed, so that the refrigerant is distributed to each hole position corresponding to the cross flow channel, ensuring that the refrigerant can reach all axial and circumferential surfaces, so that all surfaces of the heat exchange tubes are covered by the refrigerant, avoiding the drying up of local surfaces due to insufficient refrigerant; at the same time, the gaseous refrigerant produced by evaporation can also enhance the refrigerant disturbance and strengthen the heat exchange effect through the flow channel network interconnected along the circumferential and axial directions.

[0041] In this embodiment, the outer rib structures 2 are distributed 50-500 along the circumference of the tube base 1, and / or the flow channel structures 3 are provided 10-70 per inch along the axis of the tube base 1, and / or the height of the flow channel structure 3 is 0.1-0.8 mm, and / or the height of the fourth flow channel 7 is 0.1-0.8 mm.

[0042] In this embodiment, the inner wall of the tube base 1 is provided with an inner rib structure 15, which increases the heat transfer area of ​​the heat exchange tube, enhances the disturbance effect of the chilled water in the tube, strengthens the heat exchange effect in the tube, and further enhances the overall performance of the heat exchange tube. There are multiple inner rib structures 15, and the multiple inner rib structures 15 are arranged circumferentially along the inner wall of the tube base 1, and respectively extend spirally on the inner wall of the tube base 1 along the axis of the tube base 1.

[0043] In this embodiment, the angle between the inner rib structure 15 and the axis of the tube base 1 is in the range of 10-75°, and / or the number of inner rib structures 15 distributed along the circumference of the tube base 1 is 6-90, and / or the height of the inner rib structure 15 is 0.1-0.6 mm.

[0044] A heat exchanger adopts any one of the above heat exchange tubes.

[0045] An air conditioner adopts any one of the above heat exchange tubes.

[0046] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A heat exchange tube, characterized in that: include: Tube base (1); An outer rib structure (2) is provided on the outer wall of the tube base (1), a flow channel structure (3) is provided on the outer rib structure (2), the flow channel structure (3) comprises a first flow channel (4), a second flow channel (5), and a third flow channel (6), and the flow channel structure (3) is used to provide a vaporization core required for evaporation of the liquid refrigerant; There are a plurality of external rib structures (2), and the plurality of external rib structures (2) are arranged along the circumferential direction of the outer wall of the tube base (1), and respectively extend spirally on the outer wall of the tube base (1) along the axis of the tube base (1), and the flow channel structures (3) on the plurality of external rib structures (2) form a channel network; A plurality of outer rib structures (2) are arranged at intervals, and a fourth flow channel (7) is provided between adjacent outer rib structures (2), wherein the fourth flow channel (7) is a spiral channel; An umbrella-shaped wing group (8) is provided at the top of the outer rib structure (2), the umbrella-shaped wing group (8) comprising umbrella-shaped wings, the umbrella-shaped wings comprising an umbrella handle portion (16) and an umbrella cover portion (17), the umbrella cover portion (17) extending to cover above the flow channel structure (3), and / or the umbrella cover portion (17) extending to cover above the fourth flow channel (7); the umbrella handle portion (16) is connected to the tube base (1) as a whole through the outer rib structure (2); and the two umbrella handle portions (16) on the same outer rib structure (2) are arranged at intervals.

2. The heat exchange tube according to claim 1, characterized in that: The first flow channel (4), the second flow channel (5), and the third flow channel (6) intersect and communicate with each other, and intersect to form a hexagon.

3. The heat exchange tube according to claim 1, characterized in that: The flow channel structure further comprises a fifth flow channel, wherein the first flow channel (4), the second flow channel (5), the third flow channel (6) and the fifth flow channel intersect and communicate with each other, and intersect to form a cross shape.

4. The heat exchange tube according to claim 1, characterized in that: The first flow channel (4) is arranged along the spiral direction of the outer rib structure (2).

5. The heat exchange tube according to claim 2, characterized in that: The umbrella-shaped wing group (8) comprises six umbrella-shaped wings, and the six umbrella-shaped wings are respectively arranged at six angles of the flow channel structure (3).

6. The heat exchange tube according to claim 5, characterized in that: The six umbrella-shaped wings are respectively a first umbrella-shaped wing (9), a second umbrella-shaped wing (10), a third umbrella-shaped wing (11), a fourth umbrella-shaped wing (12), a fifth umbrella-shaped wing (13), and a sixth umbrella-shaped wing (14); the first umbrella-shaped wing (9), the second umbrella-shaped wing (10), the third umbrella-shaped wing (11) and the fourth umbrella-shaped wing (12), the fifth umbrella-shaped wing (13), and the sixth umbrella-shaped wing (14) are symmetrical one by one along the first flow channel (4).

7. The heat exchange tube according to any one of claims 1 to 4 and 6, characterized in that: The number of the outer rib structures (2) distributed along the circumference of the tube substrate (1) is 50-500, and / or the number of the flow channel structures (3) distributed along the axis of the tube substrate (1) is 10-70 per inch, and / or the height of the flow channel structures (3) is 0.1-0.8 mm, and / or the height of the fourth flow channel (7) is 0.1-0.8 mm.

8. The heat exchange tube according to claim 7, characterized in that: The inner wall of the tube base (1) is provided with an inner rib structure (15), the inner rib structure (15) being multiple, and the multiple inner rib structures (15) are arranged circumferentially along the inner wall of the tube base (1) and respectively extending spirally on the inner wall of the tube base (1) along the axis of the tube base (1).

9. The heat exchange tube according to claim 8, characterized in that: The angle between the inner rib structure (15) and the axis of the tube base (1) is in the range of 10-75°, and / or the inner rib structures (15) are distributed in the circumferential direction of the tube base (1) in a number of 6-90, and / or the height of the inner rib structures (15) is in the range of 0.1-0.6 mm.

10. A heat exchanger, characterized in that: A heat exchange tube according to any one of claims 1 to 9 is used.

11. An air conditioner, characterized in that: A heat exchange tube according to any one of claims 1 to 9 is used.

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