Heat exchange structure, falling film heat exchanger and air conditioner

Abstract

The present application provides a heat exchange structure, a falling film heat exchanger and an air conditioner. The heat exchange structure includes a heat exchange substrate, a heat exchange element is provided on the first side of the heat exchange substrate, and the heat exchange element includes arc-shaped teeth, at least two of which are provided, and the two arc-shaped teeth are symmetrically arranged with an interval, and the root of each arc-shaped tooth is arranged on the first side. The arc-shaped teeth are arranged on the heat exchange substrate to increase the heat exchange area, especially when the two arc-shaped teeth are symmetrically arranged with an interval, a semi-enclosed chamber structure can be formed. When used as an evaporating tube, the refrigerant can boil and exchange heat in the cavity; when used as a condensing tube, a good condensation area is provided for the gaseous refrigerant, thereby improving the heat exchange performance.

Description

Technical Field

[0001] The present application belongs to the technical field of falling film heat exchangers, and specifically relates to a heat exchange structure, a falling film heat exchanger and an air conditioner. Background Art

[0002] The existing heat exchange tube structure used in evaporators and condensers is to process the tooth shape in the circumferential direction of the outer surface of the heat exchange tube, and extend it in a spiral or other form along the axial direction of the outer tube. An evaporation cavity can be formed between the tooth shapes on the surface of the evaporator tube to achieve a boiling heat exchange effect; and the evaporation heat exchange performance depends to a large extent on the evaporation cavity, so the cavity formed between the tooth shapes on the outer tube has a great influence on the heat exchange effect. The tooth shape on the surface of the condenser tube is mainly a tall and thin type. The sharp structure on the tooth is conducive to piercing the liquid refrigerant film, reducing thermal resistance, and accelerating the dripping process of the refrigerant, so that the condensate is discharged as soon as possible, and the condensation performance is improved. However, in the heat pump unit, since the heat pump needs to achieve the performance of switching between cooling and heating conditions, its heat exchange tube is required to have the functions of evaporation and condensation in structure at the same time, which is not available in general heat exchange tubes. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present application is to provide a heat exchange structure, a falling film heat exchanger and an air conditioner that can have the functions of evaporation and condensation.

[0004] In order to solve the above problems, the present application provides a heat exchange structure, including a heat exchange base, a heat exchange element is provided on the first side of the heat exchange base, the heat exchange element includes arc-shaped teeth, at least two arc-shaped teeth are provided, the two arc-shaped teeth are symmetrically arranged with an interval, and the root of each arc-shaped tooth is arranged on the first side.

[0005] Preferably, a dispersion piece is provided on the outer side surface of the arc-shaped teeth, and the dispersion piece evenly disperses the fluid flowing through the arc-shaped teeth.

[0006] Preferably, the dispersing element comprises a sharp edge structure for piercing the liquid film.

[0007] Preferably, the distance between the farthest end of the arc-shaped tooth and the first side surface is 0.3-0.8 mm.

[0008] Preferably, the distance between the farthest end of the dispersion element and the first side surface is 0.12-0.72 mm.

[0009] According to another aspect of the present application, a falling film heat exchanger is provided, comprising the heat exchange structure as described above.

[0010] Preferably, the heat exchange matrix includes a heat exchange tube of the falling film heat exchanger, and the arc-shaped teeth are arranged on the outer wall of the heat exchange tube; a plurality of arc-shaped teeth are provided and are evenly distributed along the axial direction and / or circumferential direction of the heat exchange tube.

[0011] Preferably, when the arc-shaped teeth are symmetrically arranged along the axial direction of the heat exchange tube, the number of the arc-shaped teeth arranged per inch of length is 35 to 90.

[0012] Preferably, a plurality of grooves or protrusions arranged along the circumferential direction are provided on the outer wall of the heat exchange tube, and the grooves or protrusions are provided between adjacent arc-shaped teeth.

[0013] According to another aspect of the present application, an air conditioner is provided, comprising the heat exchange structure as described above or the falling film heat exchanger as described above.

[0014] The present application provides a heat exchange structure, including a heat exchange base, a heat exchange element is provided on the first side of the heat exchange base, and the heat exchange element includes arc-shaped teeth, at least two of which are provided, and the two arc-shaped teeth are symmetrically arranged at intervals, and the root of each arc-shaped tooth is arranged on the first side. The arc-shaped teeth are arranged on the heat exchange base to increase the heat exchange area, especially when the two arc-shaped teeth are symmetrically arranged at intervals, a semi-enclosed chamber structure can be formed. When used as an evaporating tube, the refrigerant can boil and exchange heat in the chamber; when used as a condensing tube, a good condensation area is provided for the gaseous refrigerant, thereby improving the heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional schematic diagram of a heat exchange structure according to an embodiment of the present application;

[0016] Figure 2 This is a schematic diagram of the heat exchange tube structure of a falling film heat exchanger according to an embodiment of the present application.

[0017] The reference numerals are:

[0018] 1. Heat exchange matrix; 2. Arc-shaped teeth; 3. Sharp edge structure; 4. Protrusion; 5. Groove. DETAILED DESCRIPTION

[0019] See also Figure 1 to Figure 2 As shown, according to an embodiment of the present application, a heat exchange structure includes a heat exchange substrate 1, a heat exchange element is provided on the first side of the heat exchange substrate 1, the heat exchange element includes an arc-shaped tooth 2, at least two arc-shaped teeth 2 are provided, the two arc-shaped teeth 2 are symmetrically arranged at intervals, and the root of each arc-shaped tooth 2 is arranged on the first side.

[0020] Symmetrically arranged arc teeth 2 are arranged on the first side of the heat exchange substrate 1 to increase the heat exchange area. When a plurality of symmetrically arranged arc teeth 2 are arranged, a semi-closed cavity is formed. The refrigerant boils and exchanges heat in the cavity during evaporation operation, and provides a good condensation area for the gaseous refrigerant during condensation operation.

[0021] In some embodiments, a dispersion member is provided on the outer surface of the arc-shaped teeth 2, and the dispersion member evenly disperses the fluid flowing through the arc-shaped teeth 2. In the evaporation condition, the dispersion member has the effect of evenly distributing the dripping liquid phase refrigerant, thereby enhancing the evaporation effect; and in the condensation condition, after the gas phase refrigerant condenses, the dispersion member makes the condensate evenly distributed, accelerates the heat exchange, and causes the droplets of the condensate to increase and drip more easily.

[0022] Specifically, the dispersing element includes a sharp edge structure 3 for piercing the liquid film. The sharp edge structure 3 can pierce the liquid film and accelerate the dispersion of the droplets.

[0023] In some specific embodiments, the distance between the farthest end of the arc-shaped tooth 2 and the first side surface is 0.3-0.8 mm. The distance between the farthest end of the dispersion element and the first side surface is 0.12-0.72 mm.

[0024] According to another embodiment of the present application, a falling film heat exchanger includes the heat exchange structure as described above.

[0025] In some embodiments, the heat exchange substrate 1 includes a heat exchange tube of the falling film heat exchanger, and the arcuate teeth 2 are arranged on the outer wall of the heat exchange tube; a plurality of arcuate teeth 2 are provided and are evenly distributed along the axial direction and / or circumferential direction of the heat exchange tube.

[0026] A plurality of symmetrically arranged arc-shaped teeth 2 are arranged on the outer wall of the heat exchange tube. When they are evenly distributed along the axial direction and / or circumferential direction of the heat exchange tube, the heat exchange area can be increased, and the heat exchange area can be applied to both evaporation and condensation conditions. The principle is to process the teeth on the outer surface of the heat exchange tube, so that when used as an evaporation tube, an evaporation cavity is formed between the teeth; when used as a condensation tube, the condensation and liquid uniformity effect is improved under the action of the teeth, and the heat exchange is enhanced.

[0027] In some embodiments, when the arc-shaped teeth 2 are symmetrically arranged along the axial direction of the heat exchange tube, the number of the arc-shaped teeth 2 arranged per inch of length is 35 to 90.

[0028] In some embodiments, a plurality of grooves 5 or protrusions 4 arranged along the circumferential direction are provided on the outer wall of the heat exchange tube, and the grooves 5 or the protrusions 4 are provided between adjacent arc-shaped teeth 2. The grooves 5 may include V-shaped grooves 5, serpentine grooves 5, and X-shaped grooves 5, and the protrusions 4 may include pyramid-shaped protrusions 4 and circular protrusions 4, etc., which can increase the gasification core density and effectively enhance the heat exchange efficiency.

[0029] When the falling film heat exchanger is used as an evaporator tube, Figure 2 As shown, a plurality of teeth in the axial direction can form two evaporation chambers, one large and one small, so that the refrigerant can achieve boiling heat exchange during the axial flow of the refrigerant on the outer wall of the tube; the sharp edge structure 3 on the above-mentioned tooth shape makes the liquid refrigerant evenly distributed on the heat exchange tube, thereby enhancing the evaporation effect; when this tube is used as a falling film evaporator tube, it also has a good evaporation effect; when used as a condenser tube, the above-mentioned arc-shaped teeth 2 increase the contact area between the refrigerant and the heat exchange tube, so that sufficient heat exchange can be achieved with the liquid in the tube; the above-mentioned sharp edge structure 3 can pierce the formed liquid film after the refrigerant undergoes a condensation phase change, accelerate the heat exchange of the refrigerant on the tube wall, increase the weight of the droplets, and speed up the separation from the tube wall.

[0030] According to another aspect of the present application, an air conditioner is provided, comprising the heat exchange structure as described above or the falling film heat exchanger as described above.

[0031] It is easy for those skilled in the art to understand that the above-mentioned implementation modes can be freely combined and superimposed without conflict.

[0032] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. 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 application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A heat exchange structure, characterized in that: It comprises a heat exchange substrate (1), a heat exchange element is arranged on a first side surface of the heat exchange substrate (1), the heat exchange element comprises arc-shaped teeth (2), at least two arc-shaped teeth (2) are arranged, the two arc-shaped teeth (2) are arranged symmetrically with an interval, and the root of each arc-shaped tooth (2) is arranged on the first side surface; Two adjacent arcuate teeth form an arcuate tooth group, in which the distance between the two arcuate teeth decreases first and then increases from the root to the free end, and the distance between the roots of the two arcuate teeth is smaller than the distance between the free ends of the two arcuate teeth.

2. The heat exchange structure according to claim 1, characterized in that: A dispersion piece is provided on the outer side surface of the arc-shaped tooth (2), and the dispersion piece evenly disperses the fluid flowing through the arc-shaped tooth (2).

3. The heat exchange structure according to claim 2, characterized in that: The dispersing element comprises a sharp edge structure (3) for piercing the liquid film.

4. The heat exchange structure according to claim 1, characterized in that: The distance between the farthest end of the arc-shaped tooth (2) and the first side surface is 0.3-0.8 mm.

5. The heat exchange structure according to claim 2 or 3, characterized in that: The distance between the farthest end of the dispersion element and the first side surface is 0.12-0.72 mm.

6. A falling film heat exchanger, characterized in that: It comprises the heat exchange structure as described in any one of claims 1 to 5.

7. The falling film heat exchanger according to claim 6, characterized in that: The heat exchange matrix (1) comprises a heat exchange tube of the falling film heat exchanger, and the arc-shaped teeth (2) are arranged on the outer wall of the heat exchange tube; a plurality of arc-shaped teeth (2) are provided and are evenly distributed along the axial direction and / or circumferential direction of the heat exchange tube.

8. The falling film heat exchanger according to claim 7, characterized in that: When the arc-shaped teeth (2) are symmetrically arranged along the axial direction of the heat exchange tube, the number of the arc-shaped teeth (2) arranged per inch of length is 35 to 90.

9. The falling film heat exchanger according to claim 8, characterized in that: The outer wall of the heat exchange tube is provided with a plurality of grooves (5) or protrusions (4) arranged in the circumferential direction, and the grooves (5) or protrusions (4) are arranged between adjacent arc-shaped teeth (2).

10. An air conditioner, characterized in that: It comprises the heat exchange structure as described in any one of claims 1 to 5 or the falling film heat exchanger as described in any one of claims 6 to 9.

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