Falling film heat exchange tube, falling film heat exchanger and air conditioner

Abstract

This 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 (1) and vertical teeth (2) disposed on the outer wall of the tube base (1). The vertical teeth (2) extend from the outer wall of the tube base (1) in a direction away from the outer wall. A first inclined fin (41) is formed at the top of the vertical teeth (2). The first inclined fin (41) is inclined towards the axial side and towards the tube base. A second inclined fin (42) is formed at the top of the vertical teeth (2) at a position circumferentially adjacent to the first inclined fin (41). The second inclined fin (42) is inclined towards the other axial side and towards the tube base. This invention enables the refrigerant to be guided in different axial directions when dripping onto the surfaces of the inclined fins with two different inclined directions, enhancing the uniformity of refrigerant distribution on the outer wall of the falling film heat exchange tube and effectively preventing partial drying of the heat exchange tube surface.

Description

Technical Field

[0001] The 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] In large commercial air-conditioning chillers, compared with traditional flooded evaporators, horizontal tube falling film evaporators have the advantages of high heat exchange efficiency, small refrigerant charge, no static liquid column influence, and convenient oil return, and are promoted and used by major air-conditioning manufacturers.

[0003] Different from the flooded evaporation in which the heat exchange tube bundle is completely immersed in the liquid refrigerant, in the horizontal tube falling film evaporator, the refrigerant liquid drips from top to bottom on the surface of the heat exchange tube, and the refrigerant flows axially (in the direction of the tube length) and circumferentially on the outer surface of the heat exchange tube to form a layer of liquid film. The refrigerant liquid film absorbs the heat in the tube through the tube wall to evaporate. The heat transfer efficiency of this evaporation heat transfer form in the liquid film is higher than that of the flooded pool boiling heat transfer.

[0004] Since the flooded evaporator tube is completely immersed in the refrigerant liquid, there is no need to consider the distribution of the refrigerant on the surface of the heat exchange tube. In addition to the basic evaporation function of the flooded evaporator tube, the falling film evaporator tube also needs to have the function of quickly distributing the refrigerant evenly in the axial and circumferential directions. Otherwise, the surface of the heat exchange tube is prone to partial drying up (the surface is not covered with liquid refrigerant), resulting in insufficient utilization of the heat exchange area and reduced overall heat exchange efficiency.

[0005] Since the falling film heat exchange tube in the prior art has uneven distribution of refrigerant on the outer wall, it is impossible to achieve the function of rapid uniform distribution along the axial and circumferential directions, and the surface of the heat exchange tube is prone to partial drying up (the surface is not covered with liquid refrigerant), resulting in technical problems such as insufficient utilization of the heat exchange area and reduced overall heat exchange efficiency. Therefore, 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

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the falling film heat exchange tube in the prior art that the refrigerant is unevenly distributed on the outer wall, which easily causes the surface of the heat exchange tube to dry up partially (the surface is not covered with liquid refrigerant), resulting in the heat exchange area not being fully utilized, thereby providing a falling film heat exchange tube, a falling film heat exchanger and an air conditioner.

[0007] The present invention provides a falling film heat exchange tube, comprising:

[0008] A tube base and vertical teeth arranged on the outer wall of the tube base, the vertical teeth extending from the outer wall of the tube base in a direction away from the outer wall, a first inclined wing is formed at the top end of the vertical tooth, the first inclined wing is inclined toward one side of the axial direction and toward the tube base, and a second inclined wing is formed at a circumferentially adjacent position to the first inclined wing and at the top end of the vertical tooth, the second inclined wing is inclined toward the other side of the axial direction and toward the tube base.

[0009] Preferably,

[0010] A first gap is formed between the first inclined wing and the second inclined wing; and / or, the first inclined wing is multiple and arranged along the circumferential direction of the tube base, the second inclined wing is also multiple and arranged along the circumferential direction of the tube base, and the first inclined wing and the second inclined wing are alternately arranged.

[0011] Preferably,

[0012] The top surface of the first inclined wing is a plane, which extends downward toward the tube base along one side of the axial direction, and can guide the fluid along the one side of the axial direction to the outer wall of the tube base; the top surface of the second inclined wing is also a plane, which extends downward toward the tube base along the other side of the axial direction, and can guide the fluid along the other side of the axial direction to the outer wall of the tube base.

[0013] Preferably,

[0014] The first inclined wing is formed at the top of one axial side of the vertical tooth, and a side tooth is also provided at the top of the other axial side of the vertical tooth to protrude laterally, forming a semi-closed cavity between the side tooth, the vertical tooth and the tube base, wherein the other axial side is in the opposite direction to the one axial side.

[0015] Preferably,

[0016] The side teeth are fins with an arc-shaped longitudinal section; and / or, there are multiple side teeth, which are arranged along the circumferential direction of the tube substrate, and a second gap is formed between adjacent side teeth.

[0017] Preferably,

[0018] The first inclined wing and the second inclined wing are both inclined wings: 10 to 70 inclined wings are arranged per inch along the axial direction; and / or, the inclination angle α between the top surface of the inclined wing and the horizontal plane is 5-30°; and / or, when side teeth are included, the side teeth and the inclined wing form a channel extending circumferentially between the axial direction.

[0019] Preferably,

[0020] The vertical teeth are arranged along a spiral line on the outer wall of the tube base to form a group of spiral teeth; and / or, threaded internal teeth are also arranged on the inner wall of the tube base.

[0021] Preferably,

[0022] A plurality of groups of spiral teeth are arranged axially on the outer wall of the tube base, and the plurality of groups of spiral teeth are arranged at intervals.

[0023] The present invention also provides a falling film heat exchanger, comprising the falling film heat exchange tube as described in any of the preceding items.

[0024] The present invention also provides an air conditioner, which comprises the falling film heat exchange tube or the falling film heat exchanger as described in any of the preceding items.

[0025] The falling film heat exchange tube, falling film heat exchanger and air conditioner provided by the present invention have the following beneficial effects:

[0026] 1. The present invention, through the structure of inclined wings extending downward in two axial directions arranged on the outer wall of the tube substrate, can guide the refrigerant in different axial directions when it drips onto the surfaces of the inclined wings in two different inclined directions, so that the refrigerant or other fluid can be evenly distributed on the outer wall of the tube substrate, thereby enhancing the uniformity of the distribution of the refrigerant on the outer wall of the falling film heat exchange tube, and can realize the function of rapid uniform distribution along the axial and circumferential directions, effectively preventing the phenomenon of partial drying up of the surface of the heat exchange tube (the surface is not covered by liquid refrigerant), effectively and fully utilizing the heat exchange area, and improving the overall heat exchange efficiency of the heat exchange tube; in particular, the present invention, through multiple first inclined wings and multiple second inclined wings, and the first inclined wings and the second inclined wings are alternately arranged, can further enhance the flow balancing effect of guiding the fluid along the two axial directions, so that the fluid distribution is more uniform, further effectively preventing the phenomenon of partial drying up of the surface of the heat exchange tube, and improving the overall heat exchange efficiency of the heat exchange tube;

[0027] 2. The present invention forms a transversely extending side tooth on the top of the other side of the vertical tooth and opposite to the axial direction of the inclined wing, so that a semi-closed cavity (evaporation cavity) can be formed between the vertical tooth, the side tooth and the tube base. When the heat exchange tube is used as an evaporator tube, the refrigerant fluid enters the semi-closed evaporation cavity to absorb heat and evaporate, generating a large number of bubbles. During the process of the bubbles being discharged from the top notch, the semi-closed shape of the evaporation cavity causes the refrigerant inside to generate strong turbulent disturbance, thereby improving the heat exchange efficiency.

[0028] 3. The present invention can also realize the function of uniform liquid distribution on the surface of the heat exchange tube by twice distributing the liquid refrigerant through the second gap between the inclined wings, side teeth, channels and adjacent side teeth: the outer fin surface is alternately inclined to allow the surface liquid refrigerant to flow to both sides (axially) to achieve initial distribution, and the cross flow channels composed of two annular channels and axial gaps are combined to allow the refrigerant to reach each hole position (evaporation chamber) corresponding to the cross flow channels, ensuring that the refrigerant can reach all axial and circumferential surfaces, achieving secondary liquid distribution, so that all surfaces of the heat exchange tubes are covered with refrigerant, avoiding local surfaces from drying up due to insufficient refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structure diagram of the tooth shape of the falling film heat exchange tube of the present invention;

[0030] Figure 1a yes Figure 1 A partial enlarged structural diagram of part A;

[0031] Figure 2 It is a schematic axial cross-sectional view of the falling film heat exchange tube of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the falling film heat exchange tube of the present invention from a top view.

[0033] The reference numerals in the figure are as follows:

[0034] 1. Tube base; 2. Vertical teeth; 3. Cavity; 4. Inclined wing; 41. First inclined wing; 42. Second inclined wing; 5. Channel; 6. Side teeth; 7. First gap; 8. Second gap; 9. Internal teeth. DETAILED DESCRIPTION

[0035] like Figure 1-3 As shown, the present invention provides a falling film heat exchange tube, which comprises:

[0036] A tube base body 1 and a vertical tooth 2 arranged on the outer wall of the tube base body 1, wherein the vertical tooth 2 extends from the outer wall of the tube base body 1 in a direction away from the outer wall, and on one axial side of the vertical tooth 2 (the axial direction of the tube base body, such as Figure 1 ) is formed with a first inclined wing 41 at the top end, and the first inclined wing 41 is inclined toward one side of the axial direction and toward the direction of the tube base. A second inclined wing 42 is also formed at the top end of the vertical tooth 2 at a circumferentially adjacent position to the first inclined wing 41, and the second inclined wing 42 is inclined toward the other side of the axial direction and toward the direction of the tube base.

[0037] The present invention adopts a structure of inclined wings extending downward in two axial directions on the outer wall of the tube substrate, so that the refrigerant can be guided in different axial directions when dripping onto the surfaces of the inclined wings in two different inclined directions, so that the refrigerant or other fluid can be evenly distributed on the outer wall of the tube substrate, thereby enhancing the uniformity of the distribution of the refrigerant on the outer wall of the falling film heat exchange tube, and can achieve the function of rapid uniform distribution in the axial and circumferential directions, effectively preventing the phenomenon of partial drying up of the surface of the heat exchange tube (the surface is not covered with liquid refrigerant), effectively and fully utilizing the heat exchange area, and improving the overall heat exchange efficiency of the heat exchange tube.

[0038] Preferably,

[0039] A first gap 7 is formed between the first inclined wing 41 and the second inclined wing 42. The first inclined wing 41 is multiple and arranged along the circumferential direction of the tube base. The second inclined wing 42 is also multiple and arranged along the circumferential direction of the tube base. The first inclined wing 41 and the second inclined wing 42 are arranged alternately. In particular, the present invention can further enhance the flow balancing effect of guiding the fluid along the two axial directions by providing multiple first inclined wings and multiple second inclined wings, and the first inclined wings and the second inclined wings are arranged alternately, so that the fluid distribution is more uniform, further effectively preventing the phenomenon of partial drying of the surface of the heat exchange tube, and improving the overall heat exchange efficiency of the heat exchange tube. The flow channel gap (first gap 7) in the middle of the main wing forms a cross flow channel, which distributes the refrigerant to each hole position (evaporation chamber) corresponding to the cross flow channel, ensuring that the refrigerant can reach all axial and circumferential surfaces, achieving secondary liquid uniformity, so that all heat exchange tube surfaces are covered with refrigerant, avoiding local surfaces from drying up 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 channels that are interconnected along the circumferential and axial (cross) directions.

[0040] Preferably,

[0041] The top surface of the first inclined wing 41 is a plane, and it extends downward toward the tube base body 1 along one side of the axial direction, and can guide the fluid along the one side of the axial direction to the outer wall of the tube base body 1; the top surface of the second inclined wing 42 is also a plane, and it extends downward toward the tube base body 1 along the other side of the axial direction, and can guide the fluid along the other side of the axial direction to the outer wall of the tube base body 1. This is the preferred structural form of the first and second inclined wings of the present invention, and by setting the top surface thereof as a plane and a plane extending downward, it can form a guide slope, which plays a role in effectively guiding the fluid (such as refrigerant) downward, thereby improving the guide effect.

[0042] Preferably,

[0043] A side tooth 6 is also provided at the top of the other axial side of the vertical tooth 2 in a transversely protruding direction (the transverse direction is preferably the direction of the tangent plane of the tube substrate at the position of the vertical tooth where the vertical tooth is located), and a semi-enclosed cavity 3 is formed between the side tooth 6, the vertical tooth 2 and the tube substrate 1, wherein the direction of the other axial side is opposite to the direction of the one axial side. By forming a transversely extending side tooth on the top of the other side of the vertical tooth opposite to the axial direction of the inclined wing, a semi-enclosed cavity (evaporation cavity) can be formed between the vertical tooth, the side tooth and the tube substrate. When the heat exchange tube is used as an evaporation tube, the refrigerant fluid enters the semi-enclosed evaporation cavity to absorb heat and evaporate, generating a large number of bubbles. In the process of the bubbles being removed from the top notch, the semi-enclosed shape of the evaporation cavity generates a strong turbulent disturbance in the refrigerant inside, thereby improving the evaporation heat exchange efficiency.

[0044] Preferably,

[0045] The side teeth 6 are fins with an arc-shaped longitudinal section; and / or, the side teeth 6 are multiple and arranged along the circumferential direction of the tube base 1, and a second gap 8 is formed between the adjacent side teeth 6. This is the preferred structural form of the side teeth of the present invention, which can play an effective guiding role through the arc shape, and can guide the fluid flowing down from the inclined wing on the vertical tooth adjacent to the side teeth through the fin to the channel between the inclined wing and the side teeth, and guide it from the second gap between the side teeth to the evaporation chamber, thereby improving the guiding effect. In addition, the side teeth are multiple, and in addition to being able to form multiple discontinuously distributed second gaps to play a guiding role, multiple spaced evaporation chambers can be formed at the bottom to improve the evaporation heat exchange effect.

[0046] Preferably,

[0047] The first inclined wing 41 and the second inclined wing 42 are both inclined wings: the inclined wings are provided with 10 to 70 per inch in the axial direction; and / or the inclination angle α between the top surface of the inclined wing and the horizontal plane is 5-30°; and / or, when the side teeth 6 are included, the side teeth 6 and the inclined wing form a channel 5 extending in the circumferential direction between the axial direction. This is the preferred size relationship and number of the inclined wings of the present invention. The inclination angle of 5-30° can increase the flow guiding effect, and the number of inclined wings can improve the flow guiding effect and enhance the heat exchange.

[0048] The present invention can also realize the uniform liquid distribution function on the surface of the heat exchange tube by twice distributing the liquid refrigerant through the inclined wings, side teeth, channels and the second gap between adjacent side teeth: the outer fin surface is alternately inclined to make the surface liquid refrigerant flow to both sides (axially) to realize the initial distribution, and the cross flow channel composed of two annular channels and axial gaps is combined to make the refrigerant reach each hole position (evaporation chamber) corresponding to the cross flow channel, ensuring that the refrigerant can reach all axial and circumferential surfaces, realizing secondary liquid distribution, so that all surfaces of the heat exchange tubes are covered with refrigerant, avoiding local surfaces from drying up due to insufficient refrigerant.

[0049] The high-efficiency heat exchange tube of the present invention has alternately inclined outer fins and cross flow channels composed of annular and axial gaps to achieve uniform distribution of refrigerant: a. After the refrigerant drips onto the surface of the heat exchange tube, it will be guided by the alternately inclined outer fins to the adjacent annular channels and adjacent fin gaps on the left and right to achieve a preliminary liquid equalization function; b. The annular channel (i.e., channel 5) formed by the spiral connection of the bottom of the fins along the circumferential direction can realize the annular flow of the refrigerant, and combined with the flow channel gap (first gap 7) in the middle of the main wing, a cross flow channel is formed to distribute the refrigerant to each hole position (evaporation cavity) corresponding to the cross flow channel, ensuring that the refrigerant can reach all axial and circumferential surfaces, achieving secondary liquid equalization, so that all surfaces of the heat exchange tubes are covered with refrigerant, avoiding local surfaces from drying up due to insufficient refrigerant; c. 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 channels that are interconnected circumferentially and axially (cross).

[0050] Preferably,

[0051] The vertical teeth 2 are arranged along a spiral line on the outer wall of the tube base 1 to form a group of spiral teeth; and / or, the inner wall of the tube base 1 is also provided with threaded internal teeth 9. The spiral teeth can enhance the heat exchange of the fluid along the spiral line on the outer wall of the heat exchange tube, that is, provide multiple evaporation chambers arranged along the spiral line during evaporation.

[0052] Preferably,

[0053] The outer wall of the tube base 1 is provided with multiple groups of spiral teeth arranged in the axial direction, and the multiple groups 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 interval flow blocking effect on the fluid through the spiral teeth arranged at intervals, thereby further improving the evaporation heat exchange effect and condensation heat exchange effect of the fluid in the axial direction.

[0054] The present invention also provides a falling film heat exchanger, which includes the falling film heat exchange tube described in any of the preceding items. The present invention can guide the refrigerant in different axial directions when dripping onto the inclined wing surfaces in two different inclined directions by means of the structure of inclined wings arranged on the outer wall of the tube substrate, so that the refrigerant or other fluid can be evenly distributed on the outer wall of the tube substrate, thereby enhancing the uniformity of the distribution of the refrigerant on the outer wall of the falling film heat exchange tube, and realizing the function of rapid uniform distribution in the axial and circumferential directions, effectively preventing the phenomenon of partial drying of the surface of the heat exchange tube (the surface is not covered by liquid refrigerant), effectively and fully utilizing the heat exchange area, and improving the overall heat exchange efficiency of the heat exchange tube; the present invention can further enhance the flow balancing effect of guiding the fluid in two axial directions by means of multiple first inclined wings and multiple second inclined wings, and the first inclined wings and the second inclined wings are alternately arranged, so that the fluid distribution is more uniform, further effectively preventing the phenomenon of partial drying of the surface of the heat exchange tube, and improving the overall heat exchange efficiency of the heat exchange tube.

[0055] The present invention also provides an air conditioner, which comprises the falling film heat exchange tube or the falling film heat exchanger as described in any of the preceding items.

[0056] Since the existing full-liquid evaporation tube does not have the surface distribution function, it is difficult to form a uniform and stable liquid film on the surface of the heat exchange tube when it is directly used in the horizontal tube falling film evaporator, and local drying is prone to occur, resulting in low overall heat exchange efficiency, and the advantages of falling film evaporation heat exchange cannot be fully utilized. The present invention provides a new type of high-efficiency evaporation tube, which solves the problem of uniform distribution of liquid refrigerant in the axial and circumferential directions of the falling film evaporator, improves the area utilization rate of the falling film evaporation tube bundle, and thus improves the heat exchange performance of the falling film evaporator.

[0057] The present invention is implemented by the following scheme: an enhanced evaporator tube is used for a horizontal tube falling film evaporator in a chiller, comprising a tube body of a heat transfer tube and fins on the outside of the tube body, wherein the fins are spirally coiled axially outside the tube body, and the root of the fins is connected to the tube body as a whole, wherein one side of the fins is alternately inclined and the other side is an intermittent arc-shaped horizontal wing, and there are cross gaps axially between the fins to form 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; spiral internal teeth are provided inside the tube body.

[0058] The present invention has the following beneficial effects:

[0059] The function of evenly distributing the liquid refrigerant on the surface of the heat exchange tube is achieved by distributing the liquid refrigerant twice: the outer fin surface is alternately tilted to allow the surface liquid refrigerant to flow to both sides (axially) to achieve primary distribution, and the cross flow channel composed of two annular channels and axial gaps is combined to allow the refrigerant to reach each hole position (evaporation chamber) corresponding to the cross flow channel, ensuring that the refrigerant can reach all axial and circumferential surfaces, achieving secondary liquid distribution, so that all heat exchange tube surfaces are covered with refrigerant, avoiding local surfaces from drying up due to insufficient refrigerant.

[0060] At the same time, the inner surface of the heat exchange tube is provided with spiral internal teeth to increase the heat transfer area of ​​the heat exchange tube, enhance the disturbance effect of the chilled water in the tube, strengthen the heat exchange effect in the tube, and further enhance the overall performance of the heat exchange tube.

[0061] The high-efficiency heat exchange tube of the present invention has alternately inclined outer fins and cross flow channels composed of annular and axial gaps to achieve uniform distribution of refrigerant: a. After the refrigerant drips onto the surface of the heat exchange tube, it will be guided by the alternately inclined outer fins to the adjacent annular channels and adjacent fin gaps on the left and right to achieve a preliminary liquid equalization function; b. The annular channel (i.e., channel 5) formed by the spiral connection of the bottom of the fins along the circumferential direction can realize the annular flow of the refrigerant, and combined with the flow channel gap (first gap 7) in the middle of the main wing, a cross flow channel is formed to distribute the refrigerant to each hole position (evaporation cavity) corresponding to the cross flow channel, ensuring that the refrigerant can reach all axial and circumferential surfaces, achieving secondary liquid equalization, so that all surfaces of the heat exchange tubes are covered with refrigerant, avoiding local surfaces from drying up due to insufficient refrigerant; c. 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 channels that are interconnected circumferentially and axially (cross).

[0062] The enhanced evaporator tube of the present invention comprises a tube base 1 of a heat transfer tube and main fins (i.e., vertical teeth 2) on the outside of the tube body, wherein the main fins are spirally coiled outside the tube body along the axial direction, and the root of the fins is connected to the tube body as a whole; wherein the main fins are subjected to secondary wing forming, and inclined fins 4 inclined alternately to different sides and first gaps 7 between adjacent fins are formed on one side, and discontinuous arc-shaped horizontal wings (i.e., side teeth 6) and gaps between adjacent fins (second gaps 8) are formed on the other side, and an annular gap (i.e., channel 5) is formed between the two sides (between the inclined fins 4 and the side teeth 6); the axial gaps between the fins (including the first gap 7 and the second gap 8) form a small cavity for the circulation of refrigerant and evaporation, and at the same time, two high and low annular channels (including the channel 5 and the evaporation cavity) are formed along the spiral direction to form a circumferential gap flow channel; spiral internal teeth 9 are provided in the tube body.

[0063] The spiral alternating inclined fins are provided with 10 to 70 fins per inch along the axial direction, and the inclination angle α is 5 to 30 degrees.

[0064] The internal teeth in the tube body are in a threaded shape, and the cross section of the threaded internal teeth is a trapezoid.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment 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. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A falling film heat exchange tube, characterized in that: include: A tube base (1) and a vertical tooth (2) arranged on the outer wall of the tube base (1), the vertical tooth (2) extending from the outer wall of the tube base (1) in a direction away from the outer wall, a first inclined wing (41) is formed at the top end of the vertical tooth (2), the first inclined wing (41) is inclined toward one side of the axial direction of the tube base (1) and in the direction of the tube base, and a second inclined wing (42) is formed at a position adjacent to the first inclined wing (41) in the circumferential direction and at the top end of the vertical tooth (2), the second inclined wing (42) is inclined toward the other side of the axial direction and in the direction of the tube base; A first gap (7) is formed between the first inclined wing (41) and the second inclined wing (42); The first inclined wing (41) is formed at the top of one axial side of the vertical tooth (2), and a side tooth (6) is also provided at the top of the other axial side of the vertical tooth (2) in a transversely protruding manner, and a semi-enclosed cavity (3) is formed between the side tooth (6), the vertical tooth (2) and the tube base (1), wherein the direction of the other axial side is opposite to that of the one axial side; the first inclined wing (41) is in plurality and arranged in the circumferential direction of the tube base, the second inclined wing (42) is also in plurality and arranged in the circumferential direction of the tube base, and the first inclined wing (41) and the second inclined wing (42) are arranged alternately with each other; the first inclined wing (41) and the second inclined wing (42) are both inclined wings; the side tooth (6) and the inclined wing form a channel (5) extending in the circumferential direction between the axial direction.

2. The falling film heat exchange tube according to claim 1, characterized in that: The top surface of the first inclined wing (41) is a plane, and extends downward toward the tube base body (1) along one side of the axial direction, and is capable of guiding the fluid along the one side of the axial direction to the outer wall of the tube base body (1); the top surface of the second inclined wing (42) is also a plane, and extends downward toward the tube base body (1) along the other side of the axial direction, and is capable of guiding the fluid along the other side of the axial direction to the outer wall of the tube base body (1).

3. The falling film heat exchange tube according to claim 1, characterized in that: The side teeth (6) are fins with an arc-shaped longitudinal section; and / or the side teeth (6) are multiple and arranged along the circumferential direction of the tube base (1), and a second gap (8) is formed between adjacent side teeth (6).

4. The falling film heat exchange tube according to any one of claims 1 to 3, characterized in that: The inclined wings are provided with 10 to 70 per inch along the axial direction; and / or the inclination angle α between the top surface of the inclined wing and the horizontal plane is 5-30°.

5. The falling film heat exchange tube according to any one of claims 1 to 3, characterized in that: The vertical teeth (2) are arranged along a spiral line on the outer wall of the tube base (1) to form a group of spiral teeth; and / or, the inner wall of the tube base (1) is also provided with threaded internal teeth (9).

6. The falling film heat exchange tube according to claim 5, characterized in that: A plurality of groups of spiral teeth are arranged axially on the outer wall of the tube base body (1), and the plurality of groups of spiral teeth are arranged at intervals.

7. A falling film heat exchanger, characterized in that: The invention comprises the falling film heat exchange tube according to any one of claims 1 to 6.

8. An air conditioner, characterized in that: It comprises the falling film heat exchange tube according to any one of claims 1 to 6 or the falling film heat exchanger according to claim 7.

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