CN211400917U - Falling film heat exchange tube, falling film heat exchanger and air conditioner - Google Patents

Abstract

The utility model provides a falling liquid film heat exchange tube, falling liquid film heat exchanger and air conditioner, falling liquid film heat exchange tube includes: the pipe comprises a pipe base body and vertical teeth arranged on the outer wall of the pipe base body, wherein the vertical teeth extend out from the outer wall of the pipe base body in a direction far away from the outer wall, first side teeth horizontally protruding towards a first direction are arranged at the tops of the vertical teeth, second side teeth are further convexly arranged on the side wall between the tops and the bottoms of the vertical teeth along a second direction, and the first direction is opposite to the second direction; the vertical teeth are arranged along the axial direction and/or the circumferential direction of the tube base body, and semi-closed evaporation cavities can be formed among the adjacent first side teeth and the vertical teeth, the adjacent first side teeth and the adjacent second side teeth, the adjacent second side teeth and the vertical teeth, the first side teeth and the vertical teeth which are connected with each other, and the second side teeth and the vertical teeth which are connected with each other. Through the utility model discloses the evaporation heat exchange efficiency of heat exchange tube and the condensation heat exchange efficiency who improves the heat exchange tube can be improved to the homoenergetic when heating working condition and refrigeration operating mode.

Description

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

Technical Field

The utility model belongs to the technical field of the heat transfer, concretely relates to falling liquid film heat exchange tube, falling liquid film heat exchanger and air conditioner.

Background

Along with the change of energy policy in China from fossil fuels such as coal and the like as main energy sources at the initial stage of the establishment of the country to clean energy such as electric power and the like which is developed vigorously at present, and the rising demand of 'coal to electricity' for environmental protection and energy conservation in winter heating in the north in recent years, the demand of the air conditioning field for the performance of a heat exchanger is higher and higher. The falling film heat pump has the advantages of small refrigerant filling amount, free switching between the refrigeration and heating working conditions, saving a set of circulating water supply pipelines and the like, and is more and more widely applied to northern areas needing to meet the requirements of refrigeration in summer and heating in winter. In the falling film heat pump system, a falling film heat pump pipe for heat exchange is a key heat exchange device influencing the performance of the falling film heat pump pipe. When in an evaporation working condition, the falling film type heat pump tube is required to have the characteristics of a tooth-shaped structure and a tooth top uniform liquid drainage structure, wherein the conventional falling film type evaporation tube can form a semi-closed evaporation cavity; in the condensation working condition, the falling film heat pump tube is required to have the thin and high teeth and sharp structural characteristics of the conventional condenser tube. At present, falling film evaporation tubes are generally adopted to be directly used as falling film heat pump tubes, the condensing working condition cannot be optimized, and the types of the heat exchange tubes are few in the market.

Because the heat exchange efficiency who has falling liquid film heat exchange tube among the prior art is lower, can't satisfy the needs of high-efficient falling liquid film evaporation, can satisfy the needs of outside of tubes condensation again, also can not satisfy technical problem such as market requirement that processing is convenient, with low costs, consequently the utility model discloses research design has a falling liquid film heat exchange tube, falling liquid film heat exchanger and air conditioner.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the heat exchange efficiency of falling liquid film heat exchange tube among the prior art lower, can't satisfy high-efficient falling liquid film evaporation's needs, can satisfy the defect of the needs of outside of tubes condensation again to a falling liquid film heat exchange tube, falling liquid film heat exchanger and air conditioner are provided.

The utility model provides a falling liquid film heat exchange tube, it includes:

the pipe comprises a pipe base body and vertical teeth arranged on the outer wall of the pipe base body, wherein the vertical teeth extend out from the outer wall of the pipe base body in a direction far away from the outer wall, first side teeth horizontally protruding towards a first direction are arranged at the tops of the vertical teeth, second side teeth further protruding along a second direction are arranged on the side wall between the tops and the bottoms of the vertical teeth, and the first direction is opposite to the second direction;

the vertical teeth are arranged along the axial direction and/or the circumferential direction of the pipe base body, and semi-closed evaporation cavities can be formed among the adjacent first side teeth and the vertical teeth, the adjacent first side teeth and the adjacent second side teeth, the adjacent second side teeth and the vertical teeth, the first side teeth and the vertical teeth which are connected with each other, and the second side teeth and the vertical teeth which are connected with each other.

Preferably, the first and second electrodes are formed of a metal,

the free ends of the first and/or second side teeth are formed as tips; and/or the vertical teeth and the first side teeth are integrally formed; and/or the vertical teeth and the second side teeth are integrally formed.

Preferably, the first and second electrodes are formed of a metal,

the height h1 between the tooth crest of the first side tooth and the tooth root of the vertical tooth is 0.6mm-1.2 mm; and/or the height h2 between the tooth top of the second side tooth and the tooth bottom of the vertical tooth is 0.3-0.6 mm; and/or the vertical tooth width L1 is 0.1mm-0.4 mm; and/or the minimum distance L2 between the first side teeth of the adjacent vertical teeth is 0.05mm-0.2 mm; and/or the minimum distance L3 between the first side teeth of the adjacent vertical teeth is 0.1mm-0.4 mm.

Preferably, the first and second electrodes are formed of a metal,

at least one knurling structure is arranged on the surface of the first side tooth and/or the surface of the second side tooth, which is opposite to the pipe base body.

Preferably, the first and second electrodes are formed of a metal,

at least one boss structure is arranged on the surface of the first side tooth and/or the surface of the second side tooth, which is opposite to the pipe base body.

Preferably, the first and second electrodes are formed of a metal,

the upper end surface of the first side tooth is a plane extending obliquely downwards from the position connected with the vertical tooth to the free end of the first side tooth; and/or the upper end surface of the second side tooth is a plane extending obliquely downwards from the position connected with the vertical tooth to the free end of the second side tooth.

Preferably, the first and second electrodes are formed of a metal,

at least one groove is further formed in the outer wall of the tube base body in the direction towards the interior of the tube base body, and the groove is located below the second side teeth and located in the semi-closed evaporation cavity.

Preferably, the first and second electrodes are formed of a metal,

the grooves are S-shaped grooves or rhombic and discontinuously distributed grooves.

Preferably, the first and second electrodes are formed of a metal,

the vertical teeth, the first side teeth and the second side teeth form a group of tooth units, and the pipe base body is provided with a plurality of tooth units; the plurality of tooth units are arranged on the outer wall of the pipe base body along a spiral line to form a group of spiral teeth; and a plurality of groups of spiral teeth are arranged on the outer wall of the tube base body in an upward-arranged mode, and the plurality of groups of spiral teeth are arranged at intervals.

The utility model also provides a falling liquid film heat exchanger, it includes preceding arbitrary falling liquid film heat exchange tube.

The utility model also provides an air conditioner, it includes preceding arbitrary falling liquid film heat exchange tube or aforementioned falling liquid film heat exchanger.

The utility model provides a pair of falling liquid film heat exchange tube, falling liquid film heat exchanger and air conditioner have following beneficial effect:

1. the utility model discloses a vertical tooth that sets up on the outer wall of pipe base member and at the first side tooth that vertical tooth top transversely extended towards first direction, and the second side tooth that transversely extends on the position between vertical tooth lateral wall top and bottom, can all form semi-enclosed evaporation chamber between vertical tooth and adjacent first side tooth with it, between adjacent first side tooth and second side tooth and between adjacent second side tooth and vertical tooth and between first side tooth and the vertical tooth that meet each other, and between second side tooth and the vertical tooth that meet each other, can further effectively increase the volume space in evaporation chamber for prior art, improve evaporation heat transfer effect; when the heat exchange tube is used as an evaporation tube, refrigerant fluid enters the semi-closed evaporation cavity to absorb heat and evaporate, a large number of bubbles are generated, and in the process of discharging the bubbles from the top gap, the semi-closed shape of the evaporation cavity enables the refrigerant in the evaporation cavity to generate strong turbulence disturbance, so that the heat exchange efficiency is improved; the free ends of the first side teeth and the second side teeth can puncture a liquid film when the heat exchange tube is used as a condenser tube, so that compared with the prior art, the number of the side teeth for puncturing the liquid film can be increased, the effect of puncturing the liquid film is enhanced, refrigerant liquid can quickly flow to the bottoms of the teeth, refrigerant liquid drops can be quickly discharged, and the condensing process can be always carried out efficiently; therefore, the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved under both the heating working condition and the cooling working condition;

2. the redundant refrigerant on the outer surface of the heat transfer pipe can be drained through a knurling structure and/or a boss structure on the upper end surfaces of the first side teeth and the second side teeth, so that the refrigerant is prevented from being accumulated on the outer surface of the heat transfer pipe, and on one hand, the phenomenon that an excessively thick liquid film is formed on the outer surface of the pipe and is not beneficial to heat transfer and dry evaporation is caused due to the fact that the lower discharge pipe is lack of the refrigerant can be prevented; on the other hand, the refrigerant can be prevented from splashing and failing to participate in heat exchange due to the fact that the upper-discharge refrigerant drops on an excessively thick liquid film, and the heat transfer efficiency is improved; the condition that dry evaporation is caused by lack of refrigerant in the lower discharge pipe is reduced, and the efficiency of the evaporator is prevented from being reduced due to the fact that the refrigerant cannot contact with the heat transfer pipe;

3. the root of the vertical tooth is provided with a groove, so that a vaporization core can be added under the evaporation working condition, and evaporation heat transfer can be promoted; the inclined planes of the side teeth, which are inclined downwards, can also play a role in guiding fluid, so that the fluid is guided into the evaporation cavity, and the evaporation heat exchange effect is improved;

4. when the first side teeth and the second side teeth form the pointed teeth, when the heat exchange tube is used as a condenser tube, refrigerant gas is condensed into liquid on the wall of the tube, at the moment, the pointed fins on the first teeth of the pointed teeth can puncture a liquid film to enable the refrigerant liquid to quickly flow to the bottoms of the teeth, and the bottoms of the teeth have larger surface areas, so that the accumulated liquid film is thinner, and meanwhile, refrigerant liquid drops can be quickly discharged, so that the condensation process is always carried out efficiently; the tooth profile is more diversified, so that the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved under the heating working condition and the refrigerating working condition.

Drawings

Fig. 1 is a partial three-dimensional structural view of a falling film heat exchange tube of the present invention;

fig. 2 is an axial sectional view of the falling film heat exchange tube of the present invention;

fig. 3 is a three-dimensional structure diagram of an alternative mode one of the falling film heat exchange tube of the present invention;

fig. 4 is a three-dimensional structure diagram of an alternative mode of the falling film heat exchange tube of the present invention;

FIG. 5 is a three-dimensional structure diagram of an alternative mode III of the falling film heat exchange tube of the present invention

Fig. 6 is a three-dimensional structure diagram of an alternative mode of the falling film heat exchange tube of the present invention.

The reference numbers in the figures denote:

1. a tube base; 2. a tooth unit; 21. vertical teeth; 22. a first side tooth; 23. a second side tooth; 3. a knurled structure; 4. a boss structure; 5. a groove; 6. an evaporation chamber.

Detailed Description

As shown in fig. 1-6, the utility model provides a falling film heat exchange tube, it includes:

the pipe comprises a pipe base body 1 and a vertical tooth 21 arranged on the outer wall of the pipe base body 1, wherein the vertical tooth 21 extends out from the outer wall of the pipe base body 1 in a direction away from the outer wall, a first side tooth 22 horizontally protruding towards a first direction is arranged at the top of the vertical tooth 21, and a second side tooth 23 (the vertical tooth 21, the first side tooth 22 and the second side tooth 23 are combined into a tooth unit 2 which is preferably integrally formed) is further protruding along a second direction on the side wall between the top and the bottom of the vertical tooth 21, and the first direction is opposite to the second direction;

the vertical teeth are arranged in a plurality of ways along the axial direction and/or the circumferential direction of the pipe base body 1, and semi-closed evaporation cavities 6 can be formed between the adjacent first side teeth 22 and the vertical teeth 21, between the adjacent first side teeth 22 and the adjacent second side teeth 23, between the adjacent second side teeth 23 and the vertical teeth 21, between the first side teeth 22 and the vertical teeth 21 which are connected with each other, and between the second side teeth 23 and the vertical teeth 21 which are connected with each other.

The utility model discloses a vertical tooth that sets up on the outer wall of pipe base member and at the first side tooth that vertical tooth top transversely extended towards first direction, and the second side tooth that transversely extends on the position between vertical tooth lateral wall top and bottom, can all form semi-enclosed evaporation chamber between vertical tooth and adjacent first side tooth with it, between adjacent first side tooth and second side tooth and between adjacent second side tooth and vertical tooth and between first side tooth and the vertical tooth that meet each other, and between second side tooth and the vertical tooth that meet each other, can further effectively increase the volume space in evaporation chamber for prior art, improve evaporation heat transfer effect; when the heat exchange tube is used as an evaporation tube, refrigerant fluid enters the semi-closed evaporation cavity to absorb heat and evaporate, a large number of bubbles are generated, and in the process of discharging the bubbles from the top gap, the semi-closed shape of the evaporation cavity enables the refrigerant in the evaporation cavity to generate strong turbulence disturbance, so that the heat exchange efficiency is improved; the free ends of the first side teeth and the second side teeth can puncture a liquid film when the heat exchange tube is used as a condenser tube, so that compared with the prior art, the number of the side teeth for puncturing the liquid film can be increased, the effect of puncturing the liquid film is enhanced, refrigerant liquid can quickly flow to the bottoms of the teeth, refrigerant liquid drops can be quickly discharged, and the condensing process can be always carried out efficiently; therefore, the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved under both the heating working condition and the refrigerating working condition.

Preferably, the first and second electrodes are formed of a metal,

the free end of the first side tooth 22 and/or the second side tooth 23 is formed as a tip; and/or the vertical teeth 21 and the first side teeth 22 are integrally formed; and/or the vertical teeth 21 and the second side teeth 23 are integrally formed. This is the utility model discloses a further preferred structural style of side tooth and vertical tooth, when first side tooth and second side tooth become sharp tooth, when this heat exchange tube was as the condenser pipe, refrigerant gas condensed into liquid on the chamber wall, at this moment, the sharp wing on the first tooth of sharp tooth can puncture the liquid film, makes refrigerant liquid flow to the tooth bottom portion fast, and the tooth bottom portion is because the surface area is great, so the liquid film of accumulation is thinner, can discharge away refrigerant liquid drop fast simultaneously, makes the condensation process go on high-efficiently always; the tooth shapes are more diversified, so that the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved under both the heating working condition and the cooling working condition; the structural strength of the tooth unit can be enhanced through the mode of integral forming between the vertical teeth and the side teeth, and heat exchange is enhanced.

Preferably, the first and second electrodes are formed of a metal,

the tooth root height h1 between the tooth top of the first side tooth 22 and the vertical tooth 21 is 0.6mm-1.2 mm; preferably 1.0 mm; and/or the tooth root height h2 of the tooth top of the second side tooth 23 from the vertical tooth 21 is 0.3-0.6mm, preferably 0.5 mm; and/or the width L1 of the vertical teeth 21 is 0.1mm-0.4mm, preferably 0.3 mm; and/or the minimum distance L2 between the first side teeth 22 of the adjacent vertical teeth 21 is 0.05mm-0.2mm, preferably 0.1 mm; and/or the minimum distance L3 between the first side teeth 22 of the adjacent vertical teeth 21 is 0.1mm-0.4mm, preferably 0.2 mm.

The preferred size of this is the utility model discloses a vertical tooth, side tooth and evaporation chamber (i.e. cavity) arranges the form, and the lower part cavity that forms between the horizontal fin in the middle part of the fin and the fin root has constituted independent cavity with adjacent fin, and this cavity can be as the required vaporization core of nucleate boiling to can strengthen the evaporation heat transfer; the annular channel formed by the cavities in spiral connection is beneficial to the circumferential flow of the refrigerant, and the disturbance of a vapor-liquid phase during the evaporation of the refrigerant is enhanced, so that the heat exchange effect is enhanced; axial and circumferential gaps exist among the cavities, so that a refrigerant can enter the cavities, the refrigerant can be continuously supplemented when the refrigerant is evaporated, and the refrigerant steam is discharged, so that the evaporation can be continuously carried out, and a continuous evaporation process is formed; the utility model discloses owing to increased the side tooth for two directions homoenergetic of vertical tooth form evaporation cavity structure effectively, and reinforcing vaporization core improves the evaporation heat transfer.

Preferably, the first and second electrodes are formed of a metal,

as shown in fig. 3, at least one knurling structure 3 is arranged on the surface of the first side tooth 22 and/or the second side tooth 23 opposite to the pipe base body 1; and/or the presence of a gas in the gas,

as shown in fig. 4, at least one projection structure 4 is provided on the surface of the first side tooth 22 and/or on the surface of the second side tooth 23 opposite to the tube base body 1.

The redundant refrigerant on the outer surface of the heat transfer pipe can be drained through the knurling structure and/or the boss structure on the upper end surfaces of the first side teeth and the second side teeth, so that the refrigerant is prevented from being accumulated on the outer surface of the heat transfer pipe, and on one hand, the phenomenon that an excessively thick liquid film is formed on the outer surface of the pipe and is not beneficial to heat transfer and dry evaporation is caused due to the fact that the lower discharge pipe is lack of the refrigerant can be prevented; on the other hand, the refrigerant can be prevented from splashing and failing to participate in heat exchange due to the fact that the upper-discharge refrigerant drops on an excessively thick liquid film, and the heat transfer efficiency is improved; the condition that dry evaporation is caused by lack of refrigerant in the lower discharge pipe is reduced, and the efficiency of the evaporator is prevented from being reduced due to the fact that the refrigerant cannot contact with the heat transfer pipe;

preferably, the first and second electrodes are formed of a metal,

the upper end surface of the first side tooth 22 is a plane extending obliquely downwards from the position connected with the vertical tooth 21 to the free end thereof; and/or the upper end surface of the second side tooth 23 is a plane extending obliquely downwards from the position connected with the vertical tooth 21 to the free end thereof. The inclined plane of the downward inclination of the side teeth can also play a role in guiding fluid, so that the fluid is guided to the evaporation cavity, the evaporation heat exchange effect is improved, and the excessive stay of condensed liquid on the side teeth is avoided while the heat exchange area is increased.

Preferably, the first and second electrodes are formed of a metal,

at least one groove 5 is further arranged on the outer wall of the tube base body 1 in the direction towards the inside of the tube base body, and the groove 5 is positioned below the second side tooth 23 and in the semi-closed evaporation cavity 6. The vertical tooth root is provided with a groove, so that a vaporization core can be increased under the evaporation working condition, and evaporation heat transfer can be promoted.

Preferably, the first and second electrodes are formed of a metal,

the grooves 5 are S-shaped grooves (as shown in fig. 5) or rhombic and intermittently distributed grooves (as shown in fig. 6). This is the preferred form of construction of the recess of the present invention which enhances the vaporisation core.

Preferably, the first and second electrodes are formed of a metal,

the vertical teeth 21, the first side teeth 22 and the second side teeth 23 form a group of tooth units 2, and a plurality of tooth units are arranged on the pipe base body 1; the plurality of tooth units are arranged on the outer wall of the pipe base body 1 along a spiral line to form a group of spiral teeth; and a plurality of groups of spiral teeth are arranged on the outer wall of the tube base body 1 in an upward arrangement mode, and the plurality of groups of spiral teeth are arranged at intervals. The spiral teeth form can enable the outer wall of the heat exchange tube to generate the effect of heat exchange enhancement on fluid along the spiral line, namely, a plurality of evaporation cavities arranged along the spiral line are provided during evaporation, and a plurality of fin tips arranged along the spiral line during condensation, so that the heat exchange effect on the fluid including evaporation and condensation can be respectively enhanced. Can form the choked flow effect of spaced to the fluid through the helical tooth of interval arrangement to further improve evaporation heat transfer effect and the condensation heat transfer effect to the fluid along axial direction.

The utility model also provides a falling liquid film heat exchanger, it includes preceding arbitrary falling liquid film heat exchange tube. The utility model discloses a vertical tooth that sets up on the outer wall of pipe base member and at the first side tooth that vertical tooth top transversely extended towards first direction, and the second side tooth that transversely extends on the position between vertical tooth lateral wall top and bottom, can all form semi-enclosed evaporation chamber between vertical tooth and adjacent first side tooth with it, between adjacent first side tooth and second side tooth and between adjacent second side tooth and vertical tooth and between first side tooth and the vertical tooth that meet each other, and between second side tooth and the vertical tooth that meet each other, can further effectively increase the volume space in evaporation chamber for prior art, improve evaporation heat transfer effect; when the heat exchange tube is used as an evaporation tube, refrigerant fluid enters the semi-closed evaporation cavity to absorb heat and evaporate, a large number of bubbles are generated, and in the process of discharging the bubbles from the top gap, the semi-closed shape of the evaporation cavity enables the refrigerant in the evaporation cavity to generate strong turbulence disturbance, so that the heat exchange efficiency is improved; the free ends of the first side teeth and the second side teeth can puncture a liquid film when the heat exchange tube is used as a condenser tube, so that compared with the prior art, the number of the side teeth for puncturing the liquid film can be increased, the effect of puncturing the liquid film is enhanced, refrigerant liquid can quickly flow to the bottoms of the teeth, refrigerant liquid drops can be quickly discharged, and the condensing process can be always carried out efficiently; therefore, the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube can be improved under both the heating working condition and the refrigerating working condition.

The utility model also provides an air conditioner, it includes preceding arbitrary falling liquid film heat exchange tube or aforementioned falling liquid film heat exchanger. The utility model develops a falling film heat pump pipe with a special-shaped external tooth structure; the falling film evaporation heat transfer and the condensation heat transfer are enhanced by knurling or processing a boss structure and a special-shaped tooth structure of the tooth top.

The principle of the falling film type heat pump pipe with the special-shaped external tooth structure is that the falling film evaporation heat transfer and the condensation heat transfer are enhanced by knurling or processing a boss structure at the tooth top and the special-shaped tooth structure of the falling film type heat pump pipe. The external tooth structure shown in fig. 3 and 4 increases the heat exchange area of the outer wall of the heat exchange tube, and can enhance the evaporation heat transfer and the condensation heat transfer. When falling liquid film evaporation operating mode, the annular knurl structure of the addendum of fig. 3 or the boss structure of the addendum of fig. 4 can be effectively with liquid refrigerant evenly expand the samming in heat exchange tube axial and circumference, the boiling heat transfer process of refrigerant has greatly been strengthened to the evaporation cavity structure that the semi-enclosed structure in lower part formed, outstanding downside tooth structure reinforcing intracavity refrigerant vortex simultaneously, further strengthens the evaporation heat transfer. Under the condensation working condition, the edges of the upper and lower side teeth can puncture the liquid film, so that the thermal resistance is reduced; the liquid refrigerant that the annular knurl or boss structure can be condensed down water conservancy diversion to the heat exchange tube lower part fast, and the cavity of lower part can be discharged liquid fast.

In order to further enhance the evaporation strengthening effect of the heat exchange tube, grooves with S-shaped or rhombic discontinuous distribution can be processed at the tooth bottoms of the heat exchange tube to increase the density of the vaporization cores in the evaporation cavity, and the grooves are shown in figures 5 and 6.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A falling film heat exchange tube is characterized in that: the method comprises the following steps:

the pipe comprises a pipe base body (1) and vertical teeth (21) arranged on the outer wall of the pipe base body (1), wherein the vertical teeth (21) extend out from the outer wall of the pipe base body (1) in a direction far away from the outer wall, first side teeth (22) horizontally protruding towards a first direction are arranged at the tops of the vertical teeth (21), second side teeth (23) are further convexly arranged on the side wall between the tops and the bottoms of the vertical teeth (21) along a second direction, and the first direction is opposite to the second direction;

the vertical teeth are multiple and are arranged along the axial direction and/or the circumferential direction of the pipe base body (1), and semi-closed evaporation cavities (6) can be formed between the adjacent first side teeth (22) and the vertical teeth (21), between the adjacent first side teeth (22) and the second side teeth (23), between the adjacent second side teeth (23) and the vertical teeth (21), between the mutually connected first side teeth (22) and the vertical teeth (21) and between the mutually connected second side teeth (23) and the vertical teeth (21).

2. The falling film heat exchange tube of claim 1, wherein:

the free end of the first side tooth (22) and/or the second side tooth (23) is formed as a tip; and/or the vertical teeth (21) and the first side teeth (22) are integrally formed; and/or the vertical teeth (21) and the second side teeth (23) are integrally formed.

3. The falling film heat exchange tube of claim 1, wherein:

the tooth root height h1 between the tooth top of the first side tooth (22) and the vertical tooth (21) is 0.6mm-1.2 mm; and/or the tooth top of the second side tooth (23) is 0.3-0.6mm away from the tooth root of the vertical tooth (21) by height h 2; and/or the width L1 of the vertical teeth (21) is 0.1mm-0.4 mm; and/or the minimum distance L2 between the first side teeth (22) of the adjacent vertical teeth (21) is 0.05mm-0.2 mm; and/or the minimum distance L3 between the first side teeth (22) of the adjacent vertical teeth (21) is 0.1mm-0.4 mm.

4. The falling film heat exchange tube of claim 1, wherein:

at least one knurling structure (3) is arranged on the surface of the first side tooth (22) and/or the surface of the second side tooth (23) opposite to the pipe base body (1); and/or the presence of a gas in the gas,

at least one cam structure (4) is arranged on the surface of the first side tooth (22) and/or on the surface of the second side tooth (23) opposite to the tube base body (1).

5. The falling film heat exchange tube of claim 1, wherein:

the upper end surface of the first side tooth (22) is a plane extending obliquely downwards from the position connected with the vertical tooth (21) to the free end thereof; and/or the upper end surface of the second side tooth (23) is a plane extending obliquely downwards from the position connected with the vertical tooth (21) to the free end thereof.

6. The falling film heat exchange tube of claim 1, wherein:

at least one groove (5) is further formed in the outer wall of the pipe base body (1) in the direction towards the interior of the pipe base body, and the groove (5) is located below the second side tooth (23) and located in the semi-closed evaporation cavity (6).

7. The falling film heat exchange tube of claim 6, wherein:

the grooves (5) are S-shaped grooves or rhombic grooves which are distributed discontinuously.

8. The falling film heat exchange tube of any one of claims 1 to 7, wherein:

the vertical teeth (21), the first side teeth (22) and the second side teeth (23) form a group of tooth units (2), and a plurality of tooth units are arranged on the pipe base body (1); the plurality of tooth units are arranged on the outer wall of the pipe base body (1) along a spiral line to form a group of spiral teeth; and a plurality of groups of spiral teeth are arranged on the outer wall of the tube base body (1) in an upward arrangement mode, and the plurality of groups of spiral teeth are arranged at intervals.

9. A falling film heat exchanger is characterized in that: comprising the falling film heat exchange tube of any one of claims 1 to 8.

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

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