A falling film heat exchange tube, a falling film heat exchanger and an air conditioner

Abstract

The present invention provides a falling film heat exchange tube, a falling film heat exchanger and an air conditioner. The falling film heat exchange tube includes: a tube base body (2) and a tooth main body (3) arranged on the outer wall of the tube base body (2). At the upper end of the tooth main body (3), two or more oppositely arranged side teeth (4) are provided, including a first side tooth (41) and a second side tooth (42) which are oppositely arranged. An inclined tooth (5) is further arranged on the side tooth (4). The inclined tooth (5) includes a first inclined tooth (51) protruding in the direction towards the second side tooth (42) on the first side tooth (41), and a second inclined tooth (52) protruding in the direction towards the first side tooth (41) on the second side tooth (42), so that a semi-closed small evaporation cavity (6) is formed between the first inclined tooth (51) and the second inclined tooth (52). By means of the present invention, the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved both in the heating working condition and the cooling working condition.

Description

Technical Field

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

[0002] Conventional commercial heat pump units generally use dry evaporators or flooded evaporators as evaporators and fin heat exchangers as condensers in cooling conditions. However, the cooling capacity provided by conventional dry evaporators is limited, while flooded evaporators require large amounts of refrigerant, resulting in higher costs. To resolve this contradiction, researchers developed a falling film heat pump heat exchanger based on the falling film evaporator. The primary challenge in developing a falling film heat pump heat exchanger is developing high-efficiency falling film heat pump tubes, but there are relatively few such tubes on the market. At the same time, falling film heat pump tubes cannot achieve the heat transfer enhancement ratio of traditional enhanced evaporator tubes and enhanced condenser tubes compared to bare tubes, and the enhancement ratio of condenser tubes is much higher than that of evaporator tubes. Therefore, it is necessary to use enhancement methods to enhance the evaporation and heat transfer performance of falling film heat pump tubes.

[0003] Since the falling film heat pump tube in the prior art has poor heat exchange effect when used as an evaporator tube and cannot improve the heat exchange effect in both heating and cooling conditions, the present invention studies and designs a falling film heat exchange tube, a falling film heat exchanger and an air conditioner. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the falling film heat pump tube in the prior art, which has poor heat exchange effect when used as an evaporator tube and cannot improve the heat exchange effect in both heating and cooling conditions, thereby providing a falling film heat exchange tube, a falling film heat exchanger and an air conditioner.

[0005] The present invention provides a falling film heat exchange tube, which comprises:

[0006] A tube base body and a tooth body arranged on the outer wall of the tube base body, wherein the upper end of the tooth body is provided with two or more side teeth arranged opposite to each other, including a first side tooth and a second side tooth arranged opposite to each other, and the side teeth are also provided with bevel teeth, and the bevel teeth include a first bevel tooth protruding on the first side tooth in a direction toward the second side tooth, and a second bevel tooth protruding on the second side tooth in a direction toward the first side tooth, so that a semi-enclosed small evaporation chamber is formed between the first bevel tooth and the second bevel tooth.

[0007] Preferably,

[0008] In the longitudinal section: the width L1 of the tooth body is 0.4 mm - 0.7 mm; and / or, the height h1 of the tooth body is 0.6 mm - 1.0 mm; and / or, the height h2 between the bottom of the side tooth on the tooth body and the tube base is 0.3 mm - 0.7 mm.

[0009] Preferably,

[0010] The height h3 from the bottom of the helical tooth to the top of the helical tooth is 0.1 mm - 0.4 mm; and / or, the included angle θ1 between the two side teeth is 15° - 60°; and / or, the included angle θ2 between the two helical teeth is 60° - 150°.

[0011] Preferably,

[0012] The tooth body and the two side teeth form a Y-shaped tooth with a longitudinal section in the shape of "Y"; and / or, the free ends of the side teeth and / or the helical teeth are pointed ends.

[0013] Preferably,

[0014] There are multiple tooth bodies, and the multiple tooth bodies are arranged at intervals, and a large evaporation cavity is formed between adjacent tooth bodies.

[0015] Preferably,

[0016] On the outer wall of the tube base and at the position located in the large evaporation cavity, a protrusion structure is also convexly provided; and / or, the multiple tooth bodies are arranged along a spiral line on the outer wall of the tube base to form a set of spiral teeth.

[0017] Preferably,

[0018] Multiple sets of spiral teeth are arranged on the outer wall of the tube base, and the multiple sets of spiral teeth are arranged at intervals.

[0019] Preferably,

[0020] At least one groove is also provided along the axial direction on the outer wall of the tube base; and / or, internal teeth are also provided on the inner wall of the tube base.

[0021] The present invention also provides a falling film heat exchanger, which includes the falling film heat exchange tube described in any one of the preceding items.

[0022] The present invention also provides an air conditioner, which includes the falling film heat exchange tube described in any one of the preceding items or the falling film heat exchanger described above.

[0023] The falling film heat exchange tube, falling film heat exchanger and air conditioner provided by the present invention have the following beneficial effects:

[0024] In the present invention, two helical teeth are respectively arranged on the side teeth of the tooth body, and the two helical teeth protrude oppositely, so that a structure of an evaporation chamber can be added between the two helical teeth during the evaporation condition, achieving the effect of increasing the density of the evaporation chambers on the heat exchange tube (the density of the distribution of evaporation chambers on the heat exchange tube with the same area), which is extremely beneficial to the evaporation of the refrigerant and improves the evaporation enhancement efficiency of the heat exchange tube; during the condensation condition, the helical teeth and side teeth with thorn-like structures are beneficial to puncturing the refrigerant liquid film, and at the same time, the structure serving as the evaporation chamber during the evaporation condition is beneficial to the discharge of the condensate in the circumferential direction, reducing the tube wall thermal resistance; thus, the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved both during the heating condition and the cooling condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a partial three-dimensional structure diagram of the falling film heat exchange tube of the present invention;

[0026] Figure 2 is Figure 1 a partially enlarged schematic view of part A in FIG.

[0027] Figure 3 FIG. is a dimensional structure diagram of the tooth part in the falling film heat exchange tube of the present invention;

[0028] Figure 4 FIG. is a partial three-dimensional structure diagram of the falling film heat exchange tube of the present invention (alternative method, including protrusions);

[0029] Figure 5 is Figure 4 a partially enlarged schematic view of part B in FIG.

[0030] The reference numerals in the figures are shown as:

[0031] 1, inner tooth; 2, tube matrix; 3, tooth body; 4, side tooth; 41, first side tooth; 42, second side tooth; 5, helical tooth; 51, first helical tooth; 52, second helical tooth; 6, small evaporation chamber; 7, large evaporation chamber; 8, groove; 9, protrusion structure. DETAILED DESCRIPTION OF THE INVENTION

[0032] As Figures 1-5 shown, the present invention provides a falling film heat exchange tube, which includes:

[0033] The tube base body 2 and the tooth main body 3 arranged on the outer wall of the tube base body 2. At the upper end of the tooth main body 3, two or more oppositely arranged side teeth 4 are provided, including a first side tooth 41 and a second side tooth 42 which are oppositely arranged. An inclined tooth 5 is further provided on the side tooth 4. The inclined tooth 5 includes a first inclined tooth 51 protruding in the direction towards the second side tooth 42 on the first side tooth 41, and a second inclined tooth 52 protruding in the direction towards the first side tooth 41 on the second side tooth 42, so as to form a semi-closed small evaporation cavity 6 between the first inclined tooth 51 and the second inclined tooth 52 (the small evaporation cavity is relative to the large evaporation cavity, and its volume is smaller than that of the large evaporation cavity).

[0034] In the present invention, by respectively providing two inclined teeth on the side teeth of the tooth main body, and the two inclined teeth protruding oppositely, a structure of an evaporation cavity can be added between the two inclined teeth during the evaporation working condition, achieving the effect of increasing the density of evaporation cavities on the heat exchange tube (the density of the distribution of evaporation cavities on the heat exchange tube with the same area), which is extremely beneficial to the evaporation of the refrigerant and improves the evaporation strengthening efficiency of the heat exchange tube; during the condensation working condition, the inclined teeth and side teeth with a thorn-like structure are beneficial to piercing the refrigerant liquid film, and at the same time, the structure as an evaporation cavity during the evaporation working condition is beneficial to the discharge of the condensate in the circumferential direction, reducing the tube wall thermal resistance; thus, the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved both during the heating working condition and the cooling working condition.

[0035] Preferably,

[0036] In the longitudinal section: the width L1 of the tooth main body 3 is 0.4 mm - 0.7 mm, preferably 0.5 mm; and / or, the height h1 of the tooth main body 3 is 0.6 mm - 1.0 mm, preferably 0.85 mm; and / or, the height h2 between the bottom of the side tooth 4 on the tooth main body 3 and the tube base body 2 is 0.3 mm - 0.7 mm, preferably 0.5 mm. These are the preferred tooth heights and tooth widths and other dimensions of the tooth main body and side teeth of the present invention, which can effectively increase the space volume of the large evaporation cavity between the tooth main bodies, and the top of the side tooth can play a role in piercing the liquid film during heating, but it cannot be too long otherwise the effect will be weakened as it is too far from the boundary layer, and it cannot be too short otherwise an effective evaporation cavity cannot be formed.

[0037] Preferably,

[0038] The height h3 from the bottom of the helical tooth 5 to the tooth tip of the helical tooth is 0.1 mm - 0.4 mm, preferably 0.2 mm; and / or, the included angle θ1 between the two side teeth 4 is 15° - 60°, preferably 45°; and / or, the included angle θ2 between the two helical teeth 5 is 60° - 150°, preferably 90°. These are the preferred dimensional relationships of the tooth tip height, included angle of the helical tooth, and included angle of the side tooth of the present invention, which can effectively increase the space volume of the large evaporation cavity between the side teeth, and prevent the distance between the tooth tips from being too small to cause the fluid to be unable to enter the large evaporation cavity, and increase the space volume of the small evaporation cavity between the two helical teeth, and prevent the distance between the tooth tips from being too small to cause the fluid to be unable to enter the small evaporation cavity.

[0039] Preferably,

[0040] The tooth body 3 and the two side teeth 4 are formed into a Y-shaped tooth with a longitudinal section in the shape of "Y"; and / or, the free ends of the side teeth 4 and / or the helical teeth 5 are pointed tips. This is the preferred structural form formed between the tooth body and the side teeth of the present invention, which can form a semi-closed large evaporation cavity for the fluid to enter through the side teeth between the two Y-shaped teeth, improving the evaporation heat transfer effect; and the pointed tips formed at the top of the Y-shaped teeth can pierce the refrigerant liquid film, and the pointed tips formed at the top of the helical teeth can further pierce the refrigerant liquid film, improving the condensation heat transfer effect.

[0041] Preferably,

[0042] There are multiple tooth bodies 3, and the multiple tooth bodies 3 are arranged at intervals, and a large evaporation cavity 7 is formed between two adjacent tooth bodies 3. Through the large evaporation cavity, an evaporation cavity structure for the fluid to enter and exchange heat can be formed, increasing the number of vaporization nuclei and effectively improving the evaporation heat transfer effect.

[0043] Preferably

[0044] On the outer wall of the tube base 2 and at a position located in the large evaporation cavity 7, a protruding structure 9 is also provided; and / or, the multiple tooth bodies 3 are arranged along a spiral line on the outer wall of the tube base 2 to form a set of spiral teeth. Through the protruding structure, the roughness of the wall surface can be increased, the density of the vaporization nuclei can be increased, and the heat transfer effect of the evaporation condition can be enhanced. In the form of spiral teeth, the heat transfer of the fluid can be enhanced along the spiral line on the outer wall of the heat exchange tube, that is, it includes providing multiple evaporation cavities arranged along the spiral line during evaporation, and multiple fin tips arranged in a spiral shape during condensation, which can respectively enhance the heat transfer effect of the fluid including evaporation and condensation.

[0045] Preferably,

[0046] A plurality of sets of spiral teeth are arranged on the outer wall of the tube base body 2, and the plurality of sets of spiral teeth are arranged at intervals. This is the preferred arrangement form of the multiple spiral teeth of the present invention, which can form an intermittent flow blocking effect on the fluid through the intermittently arranged spiral teeth, thereby further improving the evaporation heat transfer effect and the condensation heat transfer effect of the fluid in the axial direction.

[0047] Preferably,

[0048] At least one groove 8 is further arranged on the outer wall of the tube base body 2 along the axial direction; and / or, inner teeth 1 are further arranged on the inner wall of the tube base body 2. Through the groove structure opened on the outer wall of the tube base along the axial direction, the teeth can be separated into multiple segments in the circumferential direction, improving the turbulence effect on the fluid and enhancing heat transfer; and the heat transfer effect inside the tube can be improved through the inner teeth.

[0049] The present invention also provides a falling film heat exchanger, which includes the falling film heat exchange tube described in any one of the preceding items. By respectively arranging two inclined teeth on the side teeth of the tooth body of the present invention, and the two inclined teeth extending out relatively, a structure of an evaporation cavity can be added between the two inclined teeth during the evaporation condition, achieving the effect of increasing the density of the evaporation cavities on the heat exchange tube (the density of the distribution of evaporation cavities on the heat exchange tube with the same area), which is extremely beneficial to the evaporation of the refrigerant and improves the evaporation strengthening efficiency of the heat exchange tube; during the condensation condition, the inclined teeth and side teeth with a thorn-like structure are beneficial to piercing the refrigerant liquid film, and at the same time, the structure as the evaporation cavity during the evaporation condition is beneficial to the discharge of the condensed liquid in the circumferential direction, reducing the tube wall thermal resistance; thus, the evaporation heat transfer efficiency of the heat exchange tube and the condensation heat transfer efficiency of the heat exchange tube can be improved both during the heating condition and the refrigeration condition.

[0050] The present invention also provides an air conditioner, which includes the falling film heat exchange tube described in any one of the preceding items or the falling film heat exchanger described above. The present invention develops a falling film type high-efficiency heat pump tube with multiple evaporation cavities; by processing relative inclined teeth on the two side teeth of the Y-shaped teeth to increase the density of the evaporation cavities of the heat exchange tube so as to achieve the purpose of enhancing the evaporation heat transfer efficiency.

[0051] The present invention provides a falling film type high-efficiency heat pump tube with multiple evaporation cavities. The invention point lies in processing relative inclined teeth on the two side teeth of the Y-shaped teeth to increase the density of the evaporation cavities of the heat exchange tube so as to achieve the purpose of enhancing the evaporation heat transfer efficiency. Two inclined teeth are introduced into the Y-shaped teeth, increasing the heat transfer area. During the evaporation condition, due to the addition of an evaporation cavity structure on each tooth, the effect of increasing the density of the evaporation cavities on the heat exchange tube is achieved, which is extremely beneficial to the evaporation of the refrigerant and improves the evaporation strengthening efficiency of the heat exchange tube. During the condensation condition, the inclined teeth and side teeth with a thorn-like structure are beneficial to piercing the refrigerant liquid film, and at the same time, the structure as the evaporation cavity during the evaporation condition is beneficial to the discharge of the condensed liquid in the circumferential direction, reducing the tube wall thermal resistance.

[0052] Figure 4It shows the protrusion structure 9 at the bottom evaporation chamber of the heat pump pipe. This structure increases the roughness of the wall surface, increases the density of the vaporization nuclei, and enhances the heat transfer effect in the evaporation condition.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A falling film heat exchange tube, characterized in that: Comprising: A tube base body (2) and a tooth main body (3) arranged on the outer wall of the tube base body (2). Two or more relatively arranged side teeth (4) are arranged at the upper end of the tooth main body (3), including a first side tooth (41) and a second side tooth (42) which are relatively arranged. An inclined tooth (5) is further arranged on the side tooth (4). The inclined tooth (5) includes a first inclined tooth (51) protruding in the direction towards the second side tooth (42) on the first side tooth (41), and a second inclined tooth (52) protruding in the direction towards the first side tooth (41) on the second side tooth (42), so that a semi-closed small evaporation cavity (6) is formed between the first inclined tooth (51) and the second inclined tooth (52).

2. The falling film heat exchange tube according to claim 1, wherein: In the longitudinal section: the width L1 of the tooth main body (3) is 0.4 mm - 0.7 mm; and / or, the height h1 of the tooth main body (3) is 0.6 mm - 1.0 mm; and / or, the height h2 between the bottom of the side tooth (4) on the tooth main body (3) and the tube base body (2) is 0.3 mm - 0.7 mm.

3. The falling film heat exchange tube according to claim 1, wherein: The height h3 from the bottom of the inclined tooth (5) to the top of the inclined tooth is 0.1 mm - 0.4 mm; and / or, the included angle θ1 between the two side teeth (4) is 15° - 60°; and / or, the included angle θ2 between the two inclined teeth (5) is 60° - 150°.

4. The falling film heat exchange tube according to claim 1, wherein: The tooth main body (3) and the two side teeth (4) form a Y-shaped tooth with a longitudinal section in the shape of "Y"; and / or, the free ends of the side teeth (4) and / or the inclined teeth (5) are pointed ends.

5. The falling film heat exchange tube according to claim 1, wherein: There are multiple tooth main bodies (3), and the multiple tooth main bodies (3) are arranged at intervals, and a large evaporation cavity (7) is formed between adjacent two tooth main bodies (3).

6. The falling film heat exchange tube according to claim 5, wherein: A protrusion structure (9) is further protrudingly arranged on the outer wall of the tube base body (2) and at a position in the large evaporation cavity (7); and / or, the multiple tooth main bodies (3) are arranged along a spiral line on the outer wall of the tube base body (2) to form a set of spiral teeth.

7. The falling film heat exchange tube according to claim 6, wherein: Multiple sets of spiral teeth are arranged on the outer wall of the tube base body (2), and the multiple sets of spiral teeth are arranged at intervals.

8. The falling film heat exchange tube according to any one of claims 1 - 7, wherein: At least one groove (8) is further arranged along the axial direction on the outer wall of the tube base body (2); and / or, internal teeth (1) are arranged on the inner wall of the tube base body (2).

9. A falling film heat exchanger, characterized in that: Comprising the falling film heat exchange tube according to any one of claims 1 - 8.

10. An air conditioner, characterized in that: Comprising the falling film heat exchange tube according to any one of claims 1 - 8 or the falling film heat exchanger according to claim 9.

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