CN112944976A - Falling film heat exchange tube, falling film heat exchanger and air conditioner - Google Patents

Abstract

The invention provides a falling film heat exchange tube, a falling film heat exchanger and an air conditioner, wherein the falling film heat exchange tube comprises: the pipe base member (1) is in with setting up perpendicular tooth (2) on the outer wall of pipe base member (1), erect tooth (2) and follow the outer wall department of pipe base member (1) is in order to keep away from the direction of outer wall stretches out on the lateral wall between the top of erecting tooth (2) and the bottom and along the horizontal direction still convex side tooth (5) that are provided with, erect the tooth have a plurality ofly, and follow the axial and/or the circumference of pipe base member (1) are arranged, form semi-enclosed evaporation chamber (9) between adjacent side tooth (5) and perpendicular tooth (2) still be provided with rib (6) on the up end of side tooth (5). The invention can improve the evaporation heat exchange efficiency of the heat exchange tube and the condensation heat exchange efficiency of the heat exchange tube under both the heating working condition and the cooling working condition.

Description

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

Technical Field

The invention belongs to the technical field of heat exchange, and particularly relates to a reinforced heat exchange tube, a falling film heat exchanger and an air conditioner in a horizontal shell-tube falling film heat pump unit.

Background

The large-scale water-cooling heat pump unit can provide more comfortable experience for users due to the fact that the large-scale water-cooling heat pump unit can refrigerate and can heat, and is gradually popularized and used. The heat pump unit requires that an evaporator in the air conditioning unit can be normally used as a condenser after control switching. When in a refrigeration working condition, a low-temperature low-pressure Freon refrigerant is arranged outside the inner pipe of the evaporator, and the refrigerant outside the pipe is evaporated by hot water in the pipe; in the heating condition, the same heat exchanger is used as a condenser, and at the moment, high-temperature and high-pressure Freon refrigerant steam is arranged outside the pipe and is condensed into liquid refrigerant through cold water in the pipe. Because the evaporator and the condenser are opposite in the process of heat exchange outside the tube, the working principles of the heat exchange tubes used in the evaporation process and the condensation process are different, but in the heat pump unit, the evaporation tube must be used as the condenser tube, so the special heat exchange tube type of the heat pump unit becomes a bottleneck for the development of the heat pump unit.

In addition, the evaporators commonly used in the compression heat pump unit include a dry evaporator, a flooded evaporator and a falling film evaporator. The falling film evaporator is gradually popularized and used by air-conditioning refrigeration equipment manufacturers due to high heat exchange efficiency, small using amount of refrigerant and adaptation to the national requirements of energy conservation, emission reduction and the like. A falling-film evaporator in a heat pump unit adopts a Freon refrigerant, the Freon refrigerant drips along a horizontal evaporation pipe from top to bottom through a dripping distributor on the upper part of the evaporator, and the Freon refrigerant outside the pipe is heated and evaporated through hot water in the evaporation pipe. Therefore, the heat exchange performance of the evaporation tube determines the heat exchange performance of the falling film evaporator.

The falling film type evaporation tube has quite different requirements from a common surface porous tube (flooded evaporation tube), and not only needs more cavities to provide vaporization cores, but also needs a special structure outside the tube to conduct drainage, stagnation and the like on the Freon refrigerant, so that the Freon refrigerant flows in the direction outside the tube, and enough Freon refrigerant can enter the surface cavities to perform evaporation heat exchange in the flowing process, thereby preventing dry spots.

From the top, to falling liquid film heat pump set, same heat exchanger is falling liquid film evaporation heat transfer when doing the evaporimeter, is the condensation heat transfer outside of tubes when doing the condenser, and this is higher than ordinary heat pump set and compares the tubular structure requirement to the heat exchange tube: the falling film evaporator tube can be used as a condenser tube. Patent CN108036658A "heat exchange tube and heat exchanger for falling film heat exchanger and air conditioning heat pump unit" provides a heat exchange tube for falling film heat pump air conditioning unit, which can satisfy both the heat exchange form of falling film evaporation of heat pump unit and the heat exchange form of condensation outside the tube. The heat exchange tube meets the change of working conditions by coating the surface of the heat exchange tube, and the coating has lyophilic characteristics at 0-20 ℃ to meet the evaporation requirement; it has hydrophobic property at 30-60 deg.c to meet the requirement of condensation. However, the coating of the heat exchange tube requires the thickness of 1-10 μm and whether the coating has timeliness or not, which needs to be considered; in addition, the outer fin-shaped structure of the high-efficiency heat exchange tube is complex, uniform coating on the surface of the high-efficiency heat exchange tube is obviously unrealistic, and the improvement on the heat exchange efficiency of the surface coating of the light tube is obviously limited. Therefore, the tube type of the high-efficiency heat exchange tube has urgent need for meeting the heat exchange requirements of the falling film heat pump unit, such as adaptability to falling film evaporation and external condensation, and having high heat exchange efficiency, convenient processing, long timeliness and low processing cost.

Because the heat exchange efficiency of the falling film heat exchange tube in the prior art is lower, the requirements of high-efficiency falling film evaporation and condensation outside the tube cannot be met, and the market requirements of convenient processing and low cost cannot be met, the invention researches and designs the falling film heat exchange tube, the falling film heat exchanger and the air conditioner.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects that the heat exchange efficiency of the falling film heat exchange tube in the prior art is low, the requirement of high-efficiency falling film evaporation cannot be met, and the requirement of condensation outside the tube cannot be met, so that the falling film heat exchange tube, the falling film heat exchanger and the air conditioner are provided.

The invention provides a falling film heat exchange tube, which comprises:

the pipe base member is in with the setting perpendicular tooth on the pipe base member outer wall, perpendicular tooth is followed the outer wall of pipe base member is in order keeping away from the direction of outer wall stretches out just along the convex side tooth that is provided with still of horizontal direction on the lateral wall between the top of perpendicular tooth and the bottom, perpendicular tooth has a plurality ofly, and follows the axial and/or circumference of pipe base member are arranged, form half confined evaporation chamber between adjacent side tooth and perpendicular tooth still be provided with the rib on the up end of side tooth.

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

more than two ribs are arranged on the upper end face of each side tooth, and the more than two ribs are arranged in a crossed mode.

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

the length of the edge strip is 0.15-0.3 mm, and/or the height of the edge strip is 0.05-0.2 mm; and/or, every be provided with two on the up end of side tooth the rib, and two the rib is the cross, and the alternately contained angle is 30 ~ 90.

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

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

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

the plurality of vertical teeth are arranged along the circumferential direction of the pipe base body, and the plurality of evaporation cavities are arranged along the circumferential direction.

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

11-60 vertical teeth are arranged in each inch along the axial direction; and/or the height of the vertical teeth is 0.6-1 mm, and/or the height of the side teeth from the roots of the vertical teeth in the vertical direction is 0.3-0.65 mm; and/or, 50-170 evaporation cavities are distributed along the circumferential direction, and/or two adjacent circumferential directions are arranged at a circumferential interval of 0.03-0.6 mm and/or the height of the evaporation cavity is 0.1-0.65 mm.

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

the outer wall of the tube base body is also provided with at least one convex tooth in a protruding manner in a direction far away from the outer wall, and the convex tooth is positioned below the side tooth and in the semi-closed evaporation cavity; and/or at least one groove which is formed downwards is formed in the top of the vertical tooth, and the groove extends to the position of the side tooth.

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

in an axial cross-section of the tube base: the section of the vertical teeth is approximately triangular, and the vertical teeth are formed into pointed teeth; and/or the cross section of the side teeth is also approximately triangular and is formed into pointed teeth; and/or the cross section of the convex teeth is rectangular, triangular or trapezoidal.

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

the height of the convex teeth is 0.05-0.2 mm, and/or the thickness of the convex teeth along the circumferential direction is 0.08-0.2 mm, and/or the distance between two adjacent convex teeth in the circumferential direction is 0.1-6 mm.

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

the vertical teeth and the 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.

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

a plurality of groups of spiral teeth are arranged on the outer wall of the tube base body in an upward row, and the plurality of groups of spiral teeth are arranged at intervals; and/or the helical angle alpha of the helical teeth is 0.2-2.5 degrees.

The invention also provides a falling film heat exchanger which comprises the falling film heat exchange tube.

The invention also provides an air conditioner which comprises the falling film heat exchange tube or the falling film heat exchanger.

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

1. according to the invention, the semi-closed evaporation cavity can be formed between the vertical teeth and the side teeth adjacent to the vertical teeth by the vertical teeth arranged on the outer wall of the tube substrate and the side teeth transversely extending on the side walls of the vertical teeth, when the heat exchange tube is used as an evaporation tube, refrigerant fluid enters the semi-closed evaporation cavity to absorb heat and evaporate to generate a large amount of bubbles, and in the process of discharging the bubbles from the top gap, the refrigerant in the evaporation cavity generates strong turbulence disturbance due to the semi-closed shape of the evaporation cavity, so that the heat exchange efficiency is improved; the ribs on the upper end surfaces of the side teeth can guide redundant refrigerant on the outer surface of the heat transfer pipe, 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 and reduced; the cross flow channels can also ensure the falling directionality of the refrigerant, prevent the refrigerant from deviating when dropping and not dropping on the pipes right below, reduce the condition that the lower discharge pipe lacks the refrigerant to cause dry evaporation, and prevent the refrigerant from not contacting with the heat transfer pipe to cause the efficiency reduction of the evaporator; the vertical teeth and the ribs can also puncture a liquid film when the heat exchange tube is used as a condenser tube, so that refrigerant liquid can quickly flow to the bottoms of the teeth, refrigerant liquid drops can be quickly discharged, and the condensation 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 roots of the vertical teeth are provided with independent transverse vertical convex teeth, and the convex teeth not only can increase the heat transfer area, but also can enhance the disturbance of Freon in the lower cavity in the flow process in the annular channel, thereby enhancing the heat exchange; in addition, in the evaporation working condition, the gaps among the vertical convex teeth can also provide a vaporization core, so that the 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;

3. when the vertical teeth and the side teeth are formed into the sharp 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 sharp fins on the first teeth of the sharp teeth can puncture a liquid film to enable the refrigerant liquid to rapidly 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 refrigerant liquid drops can be rapidly discharged, so that the condensation process is always efficiently carried out; 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 vertical grooves from the tops of the upper vertical teeth to the transverse fins can strengthen the drainage effect on Freon refrigerants, so that the refrigerants flow directionally during falling film evaporation, and are prevented from shifting and not participating in heat exchange when dripping.

Drawings

Figure 1 is an axial cross-sectional schematic view of a falling film heat exchange tube of the present invention;

fig. 2 is a tooth-shaped three-dimensional structure diagram of the falling film heat exchange tube of the present invention.

The reference numbers in the figures denote:

1. a tube base; 2. vertical teeth; 3. a gap; 4. a groove; 5. side teeth; 6. a rib; 7. a convex tooth; 8. internal teeth; 9. an evaporation chamber.

Detailed Description

As shown in fig. 1-2, the present invention provides a falling film heat exchange tube comprising:

the pipe base member 1 is in with the setting perpendicular tooth 2 on the pipe base member 1 outer wall, perpendicular tooth 2 is followed the outer wall department of pipe base member 1 is in order to keep away from the direction of outer wall stretches out on the lateral wall between the top of perpendicular tooth 2 and the bottom and along the convex side tooth 5 that is provided with still of horizontal direction, perpendicular tooth has a plurality ofly, and follows the axial and/or circumference of pipe base member 1 arrange, form semi-closed evaporation chamber 9 between adjacent side tooth 5 and perpendicular tooth 2 still be provided with rib 6 on the up end of side tooth 5.

According to the invention, the semi-closed evaporation cavity can be formed between the vertical teeth and the side teeth adjacent to the vertical teeth by the vertical teeth arranged on the outer wall of the tube substrate and the side teeth transversely extending on the side walls of the vertical teeth, when the heat exchange tube is used as an evaporation tube, refrigerant fluid enters the semi-closed evaporation cavity to absorb heat and evaporate to generate a large amount of bubbles, and in the process of discharging the bubbles from the top gap, the refrigerant in the evaporation cavity generates strong turbulence disturbance due to the semi-closed shape of the evaporation cavity, so that the heat exchange efficiency is improved; the ribs on the upper end surfaces of the side teeth can guide redundant refrigerant on the outer surface of the heat transfer pipe, 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 vertical teeth and the ribs can also puncture a liquid film when the heat exchange tube is used as a condenser tube, so that refrigerant liquid can quickly flow to the bottoms of the teeth, refrigerant liquid drops can be quickly discharged, and the condensation 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,

more than two ribs 6 are arranged on the upper end face of each side tooth 5, and the more than two ribs 6 are arranged in a crossed mode. The cross flow channels can also ensure the falling directionality of the refrigerant, prevent the refrigerant from deviating when dropping and not dropping on the pipes right below, reduce the condition that the lower discharge pipe lacks the refrigerant to cause dry evaporation, and prevent the refrigerant from not contacting with the heat transfer pipe to cause the efficiency reduction of the evaporator;

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

the length of the rib 6 is 0.15-0.3 mm, and/or the height of the rib 6 is 0.05-0.2 mm; and/or, every be provided with two on the up end of side tooth 5 the ribbing 6, and two the ribbing 6 is the cross, and the alternately contained angle is 30 ~ 90. The ribs have the optimal size, so that the drainage effect on fluid can be further effectively enhanced, the probability that the fluid falls into the evaporation cavity is improved, and the heat exchange efficiency is enhanced.

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

the upper end surface of the side tooth 5 is a plane extending obliquely downwards from the position connected with the vertical tooth 2 to the free end thereof; and/or the lower end surface of the side tooth 5 is a plane extending horizontally from the position connected with the vertical tooth 2 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,

a plurality of the vertical teeth 2 are arranged along the circumferential direction of the pipe base body, and the evaporation cavities are arranged along the circumferential direction. This is a further preferred arrangement form of the plurality of vertical teeth of the present invention, that is, a plurality of vertical teeth are arranged in the circumferential direction, and each vertical tooth correspondingly forms one evaporation cavity (i.e., a cavity), that is, a plurality of evaporation cavities can be formed in the circumferential direction of the tube, so as to improve the evaporation heat exchange effect.

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

11-60 vertical teeth 2 are arranged in each inch along the axial direction; and/or the height of the vertical teeth is 0.6-1 mm, and/or the height of the side teeth 5 from the root parts of the vertical teeth 2 in the vertical direction is 0.3-0.65 mm; and/or, 50-170 evaporation cavities are distributed along the circumferential direction, and/or two adjacent circumferential directions are arranged at a circumferential interval of 0.03-0.6 mm and/or the height of the evaporation cavity is 0.1-0.65 mm. The preferred size arrangement form of the vertical teeth, the side teeth and the evaporation cavity (namely cavities) of the invention is that the lower cavity formed between the transverse fin in the middle of the fin and the root of the fin and the adjacent fin form an independent cavity which can be used as a vaporization core required by nucleate boiling, thereby being capable of strengthening evaporation heat exchange; 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 between every two cavities, so that the 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.

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

at least one convex tooth 7 is further arranged on the outer wall of the tube base body 1 in a manner of extending away from the outer wall, and the convex tooth 7 is positioned below the side tooth 5 and in the semi-closed evaporation cavity 9; and/or at least one groove 4 which is opened downwards is arranged at the top of the vertical tooth 2, and the groove 4 extends to the position of the side tooth 5. The roots of the vertical teeth are provided with independent transverse vertical convex teeth, and the convex teeth not only can increase the heat transfer area, but also can enhance the disturbance of Freon in the lower cavity in the flow process in the annular channel, thereby enhancing the heat exchange; in addition, in the evaporation working condition, the gaps among the vertical convex teeth can also provide a vaporization core, so that the evaporation heat transfer can be promoted; the inclined plane of the side teeth which is inclined downwards can also play a role in guiding fluid, so that the fluid is guided to the evaporation cavity, and the evaporation heat exchange effect is improved.

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

in an axial cross section of the tube base body 1: the section of the vertical teeth is approximately triangular, and the vertical teeth are formed into pointed teeth (or saw-shaped teeth); and/or the cross section of the side teeth 5 is also approximately triangular and is formed into pointed teeth; and/or the cross section of the convex teeth 7 is rectangular, triangular or trapezoidal. When the vertical teeth and the side teeth are formed into the sharp 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 sharp fins on the first teeth of the sharp teeth can puncture a liquid film to enable the refrigerant liquid to rapidly 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 refrigerant liquid drops can be rapidly discharged, so that the condensation process is always efficiently carried out; 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 vertical grooves from the tops of the upper vertical teeth to the transverse fins can strengthen the drainage effect on Freon refrigerants, so that the refrigerants flow directionally during falling film evaporation, and are prevented from shifting and not participating in heat exchange when dripping.

The independent sawtooth-shaped vertical teeth can effectively pierce a condensate film, and the sharp vertical tooth tops can change the action direction of surface tension; meanwhile, the transverse side teeth in the middle of the vertical teeth not only increase the heat exchange area, but also enable a condensate film to turn, enhance the effect of surface tension and enable condensate to flow downwards rapidly, thereby strengthening condensation heat exchange.

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

the height of the convex teeth 7 is 0.05-0.2 mm, and/or the thickness of the convex teeth 7 along the circumferential direction is 0.08-0.2 mm, and/or the distance between two adjacent convex teeth 7 in the circumferential direction is 0.1-6 mm. The preferred size range of the convex teeth can further increase the heat transfer area, and can enhance the disturbance of the Freon in the lower cavity in the flow process in the annular channel, thereby enhancing the heat exchange; in addition, in the evaporation working condition, the gaps among the vertical fins can provide a vaporization core, so that the evaporation heat transfer can be promoted.

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

the vertical teeth 2 and the side teeth 5 form a group of tooth units, and the pipe base body 1 is provided with a plurality of tooth units; 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. 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.

Still be provided with the internal tooth 8 of screw thread form on the 1 inner wall of pipe base member, internal tooth 8 in the pipe body is the screw thread form, and the internal tooth cross-section of this screw thread form is triangle-like, and the addendum angle scope of internal tooth is 10 ~ 120. The axis included angle range of the thread internal teeth 8 and the pipe base body 1 is 10-75 degrees, the number of the internal teeth is 6-90, and the height of the internal teeth is 0.1-0.6 mm. The heat transfer area in the heat transfer pipe can be effectively increased, the fluid turbulence in the heat transfer pipe can be enhanced, and the heat exchange efficiency in the pipe is increased.

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

a plurality of groups of spiral teeth are arranged on the outer wall of the tube base body 1 in an upward row, and the plurality of groups of spiral teeth are arranged at intervals; and/or the helical angle alpha of the helical teeth is 0.2-2.5 degrees. The spiral teeth are arranged at intervals, so that the effect of blocking flow of the fluid at intervals is formed, and the evaporation heat exchange effect and the condensation heat exchange effect of the fluid along the axial direction are further improved; the optimal sizes of the helical angle and the helical pitch of the helical teeth are set in the size range, so that the liquid film puncture effect on fluid and the enhancement effect on a vaporization core can be further improved, and the evaporation heat exchange effect and the condensation heat exchange effect are respectively improved.

The invention also provides a falling film heat exchanger which comprises the falling film heat exchange tube. According to the invention, the semi-closed evaporation cavity can be formed between the vertical teeth and the side teeth adjacent to the vertical teeth by the vertical teeth arranged on the outer wall of the tube substrate and the side teeth transversely extending on the side walls of the vertical teeth, when the heat exchange tube is used as an evaporation tube, refrigerant fluid enters the semi-closed evaporation cavity to absorb heat and evaporate to generate a large amount of bubbles, and in the process of discharging the bubbles from the top gap, the refrigerant in the evaporation cavity generates strong turbulence disturbance due to the semi-closed shape of the evaporation cavity, so that the heat exchange efficiency is improved; the ribs on the upper end surfaces of the side teeth can guide redundant refrigerant on the outer surface of the heat transfer pipe, 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 and reduced; the cross flow channels can also ensure the falling directionality of the refrigerant, prevent the refrigerant from deviating when dropping and not dropping on the pipes right below, reduce the condition that the lower discharge pipe lacks the refrigerant to cause dry evaporation, and prevent the refrigerant from not contacting with the heat transfer pipe to cause the efficiency reduction of the evaporator; the vertical teeth and the ribs can also puncture a liquid film when the heat exchange tube is used as a condenser tube, so that refrigerant liquid can quickly flow to the bottoms of the teeth, refrigerant liquid drops can be quickly discharged, and the condensation 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 invention also provides an air conditioner (preferably a heat pump air conditioner structure) comprising the falling film heat exchange tube or the falling film heat exchanger. The reinforced evaporation tube for the compression type falling film heat pump unit comprises a tube base body 1 of a heat transfer tube and vertical teeth on the outer side of the tube body, wherein the vertical teeth are spirally wound outside the tube body along the axial direction, the root parts of the vertical teeth are connected with the tube body into a whole, the vertical teeth are in a sawtooth shape, and a gap 3 is formed in the circumferential direction of the vertical teeth; the middle part of each vertical tooth is provided with a lateral tooth 5 which extends transversely, and the lateral tooth 5, the root part of each vertical tooth 2 and the space between the axially adjacent vertical teeth form an independent cavity (namely an evaporation cavity 9); the upper surface of the side tooth is provided with crossed ribs 6; the middle part of each vertical tooth is provided with a vertical groove 4 from the tooth top to the side tooth; the root of the vertical tooth is provided with a plurality of independent convex teeth 7 which are parallel in the axial direction, and the inside of the pipe body is provided with an inner tooth 8.

The heat transfer pipe of the invention is processed by a special machine tool, and the fin-shaped inside and outside the pipe is integrally formed, the specific processing process outside the pipe is as follows: firstly, processing spiral fins on a heat transfer pipe base body 1, then cutting the spiral fins into a plurality of independent vertical teeth 2 by using a knurling tool, and extruding convex teeth 7 at the roots of the vertical teeth by using a special tool; transverse side teeth 5 are then rolled on one side of the fins with a rolling cutter, while grooves 4, as well as cross ribs 6, are pressed on the platform. The rolling and spinning technology is adopted for processing without increasing the manufacturing material of the heat transfer pipe, thereby not only saving the production cost, but also increasing the strength and the heat transfer area of the heat transfer pipe. The external tooth structure of the embodiment of the invention is optimally designed according to the principles of falling film evaporation and condensation, can strengthen falling film evaporation heat exchange and strengthen external Freon refrigerant steam condensation, meets the requirements of the cooling and heating working conditions of the falling film heat pump unit, and can further improve the energy efficiency of the falling film heat pump unit.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several 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 (13)

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

the pipe base member (1) is in with setting up perpendicular tooth (2) on the outer wall of pipe base member (1), erect tooth (2) and follow the outer wall department of pipe base member (1) is in order to keep away from the direction of outer wall stretches out on the lateral wall between the top of erecting tooth (2) and the bottom and along the horizontal direction still convex side tooth (5) that are provided with, erect the tooth have a plurality ofly, and follow the axial and/or the circumference of pipe base member (1) are arranged, form semi-enclosed evaporation chamber (9) between adjacent side tooth (5) and perpendicular tooth (2) still be provided with rib (6) on the up end of side tooth (5).

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

more than two ribs (6) are arranged on the upper end face of each side tooth (5), and the more than two ribs (6) are arranged in a crossed mode.

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

the length of the edge strip (6) is 0.15-0.3 mm, and/or the height of the edge strip (6) is 0.05-0.2 mm; and/or, every be provided with two on the up end of side tooth (5) ribbing (6), and two ribbing (6) are the cross, and the contained angle that intersects is 30 ~ 90.

4. A falling film heat exchange tube according to any one of claims 1 to 3, wherein:

the upper end surface of the side tooth (5) is a plane extending obliquely downwards from the position connected with the vertical tooth (2) to the free end thereof; and/or the lower end surface of the side tooth (5) is a plane extending horizontally from the position connected with the vertical tooth (2) to the free end thereof.

5. The falling film heat exchange tube of any one of claims 1 to 4, wherein:

a plurality of the vertical teeth (2) are arranged along the circumferential direction of the pipe base body, and a plurality of evaporation cavities are arranged along the circumferential direction.

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

11-60 vertical teeth (2) are arranged in each inch along the axial direction; and/or the height of the vertical teeth is 0.6-1 mm, and/or the height of the side teeth (5) from the root parts of the vertical teeth (2) in the vertical direction is 0.3-0.65 mm; and/or, 50-170 evaporation cavities are distributed along the circumferential direction, and/or two adjacent circumferential directions are arranged at a circumferential interval of 0.03-0.6 mm and/or the height of the evaporation cavity is 0.1-0.65 mm.

7. The falling film heat exchange tube of any one of claims 1 to 6, wherein:

the outer wall of the tube base body (1) is further provided with at least one convex tooth (7) in a protruding manner in a direction far away from the outer wall, and the convex tooth (7) is positioned below the side teeth (5) and in the semi-closed evaporation cavity (9); and/or at least one groove (4) which is formed downwards is formed in the top of the vertical tooth (2), and the groove (4) extends to the position of the side tooth (5).

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

in an axial section of the tube base body (1): the section of the vertical teeth is approximately triangular, and the vertical teeth are formed into pointed teeth; and/or the cross section of the side teeth (5) is also approximately triangular and is formed into pointed teeth; and/or the cross section of the convex teeth (7) is rectangular, triangular or trapezoidal.

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

the height of the convex teeth (7) is 0.05-0.2 mm, and/or the thickness of the convex teeth (7) along the circumferential direction is 0.08-0.2 mm, and/or the distance between two adjacent convex teeth (7) in the circumferential direction is 0.1-6 mm.

10. A falling film heat exchange tube according to any one of claims 1 to 9, wherein:

the vertical teeth (2) and the side teeth (5) form a group of tooth units, and the pipe base body (1) is provided with a plurality of tooth units; 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/or the inner wall of the pipe base body (1) is also provided with thread-shaped internal teeth (8).

11. The falling film heat exchange tube of claim 10, wherein:

a plurality of groups of spiral teeth are arranged on the outer wall of the tube base body (1) in an upward mode, and the spiral teeth are arranged at intervals; and/or the helical angle alpha of the helical teeth is 0.2-2.5 degrees.

12. A falling film heat exchanger is characterized in that: comprising the falling film heat exchange tube of any one of claims 1 to 11.

13. An air conditioner, characterized in that: comprising a falling film heat exchange tube according to any one of claims 1 to 11 or a falling film heat exchanger according to claim 12.

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