CN107860248B - Microchannel heat exchanger and air conditioner - Google Patents
Microchannel heat exchanger and air conditioner Download PDFInfo
- Publication number
- CN107860248B CN107860248B CN201711029531.3A CN201711029531A CN107860248B CN 107860248 B CN107860248 B CN 107860248B CN 201711029531 A CN201711029531 A CN 201711029531A CN 107860248 B CN107860248 B CN 107860248B
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- heat exchange
- guide
- heat exchanger
- exchange tube
- fins
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- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000009825 accumulation Methods 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 43
- 238000010257 thawing Methods 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/30—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means being attachable to the element
Abstract
The invention relates to a microchannel heat exchanger, which is characterized by comprising a heat exchange tube; the outer wall of the heat exchange tube is provided with a flow guide groove, and the flow guide groove can collect and guide liquid on the outer wall of the heat exchange tube so as to reduce the accumulation of the liquid on the outer wall of the heat exchange tube. The condensed water or defrosting water stored at the outer wall of the heat exchange tube can be at least partially collected into the guide groove through the guide groove and discharged through the guide groove, so that the water storage quantity on the outer wall of the heat exchange tube is reduced, the frosting quantity of the outer wall of the heat exchange tube is reduced under the low-temperature working condition, and the heat exchange efficiency of the heat exchange tube is improved.
Description
Technical Field
The invention relates to the technical field of heat exchange devices, in particular to a micro-channel heat exchanger and an air conditioner.
Background
At present, the pipe belt type micro-channel heat exchanger is widely used in various fields of automobiles, medical treatment, household air conditioners and the like, and has the characteristics of light weight, compact structure, high heat exchange efficiency and difficult film rewinding. The tube-strip type microchannel heat exchanger is provided with a plurality of holes in the flat tube so as to increase the convection heat exchange area of the refrigerant side, thereby playing a role in increasing the heat exchange amount of the refrigerant side. In the aspect of wind side heat transfer, wavy heat exchange fins with the same width as the flat tubes are arranged between the adjacent flat tubes, and the wave crests and wave troughs of the fins are respectively welded with the adjacent two flat tubes in a furnace passing welding mode, so that the heat transfer resistance is reduced, the wind side heat exchange area is increased, and the overall heat exchange efficiency of the heat exchanger is improved. The middle part of the heat exchange fin is provided with a window, so that air flow is disturbed, and air side heat exchange is further enhanced.
The structure of the tube-strip heat exchanger greatly improves the heat exchange quantity of the heat exchanger in unit area, however, when the tube-strip microchannel heat exchanger is used as an evaporator in a heat pump system under a low-temperature working condition, frost layers can be condensed on fins and flat tubes, after reversing defrosting is adopted, defrosting water can be accumulated on the flat tubes due to the rectangular cross section of the flat tubes, when the heat pump system is switched back again, water accumulated on the flat tubes can be frosted rapidly, and the circulation is repeated, so that the frost layers on the surface of the heat exchanger are thicker, the heat exchange quantity of the heat exchanger is continuously reduced, and finally the air conditioning system stops running.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a microchannel heat exchanger and an air conditioner, and aims to reduce accumulated water on a heat exchange tube of the microchannel heat exchanger.
The technical scheme adopted by the invention is as follows:
according to one aspect of the present invention, there is provided a microchannel heat exchanger comprising a heat exchange tube;
the outer wall of the heat exchange tube is provided with a flow guide groove, and the flow guide groove can collect and guide liquid on the outer wall of the heat exchange tube so as to reduce the accumulation of the liquid on the outer wall of the heat exchange tube.
Preferably, the heat exchange tube is a flat tube horizontally arranged and comprises an upper wall surface, and the flow guide groove is arranged at the upper wall surface.
Preferably, the upper wall surface is inclined with respect to the horizontal plane to facilitate drainage of liquid on the upper wall surface.
Preferably, at the upper wall surface, the flow guiding groove is provided to extend in a direction perpendicular to a central axis of the heat exchange tube.
Preferably, the number of the flow guiding grooves is multiple, and the multiple flow guiding grooves are arranged in parallel at the upper wall surface.
Preferably, a plurality of heat exchange tubes are arranged at intervals along the vertical direction, and wavy heat exchange fins are arranged between two adjacent heat exchange tubes;
the heat exchange fin comprises a plurality of wave troughs, and the distance between two adjacent flow guide grooves is 1-5 times of the distance between two adjacent wave troughs of the heat exchange fin.
More preferably, the distance between two adjacent flow guiding grooves is 2-3 times of the distance between two adjacent wave troughs of the heat exchange fin.
Preferably, the heat exchange fin includes a plurality of peaks, and the flow guiding groove is disposed on the upper wall surface at a position opposite to the peaks.
Preferably, the heat exchange fin is provided with a window structure capable of disturbing fluid flowing through the heat exchange fin.
Preferably, the diversion groove is a wedge-shaped groove, the opening angle of the wedge-shaped groove is 60-120 degrees, and the width of the groove is 0.5-2mm; and/or the groove depth of the flow guide groove is not more than half of the thickness of the wall of the heat exchange tube.
Preferably, the microchannel heat exchanger further comprises guide fins fixed to the side walls of the heat exchange tubes on the windward side to guide the liquid on the outer walls of the heat exchange tubes to flow onto the guide fins.
Preferably, on one heat exchange tube, the number of the guide fins is the same as the number of the guide grooves, and the guide fins are in one-to-one correspondence with the guide grooves.
Preferably, when one end of the guide groove is positioned at the side wall of the windward side of the heat exchange tube, the guide fin is arranged at the one end and is matched with the guide groove to form a guide passage.
Preferably, a notch is arranged at the edge of the guide fin matched with the heat exchange tube, and the shape of the notch is matched with the shape of the side wall of the windward side of the heat exchange tube.
Preferably, when the microchannel heat exchanger comprises a plurality of the heat exchange tubes, the guide fin comprises a plurality of the indentations;
the notches are in one-to-one correspondence with the heat exchange tubes and are matched with the heat exchange tubes, so that the guide fins can be connected with all the heat exchange tubes in an adaptive mode.
Preferably, the notch of the guide fin is fixedly connected with the side wall of the windward side of the heat exchange tube in a welding mode.
Preferably, the guide fin further comprises:
the first flanging is arranged at the vertical upper end of the guide fin and is horizontally arranged; and/or the number of the groups of groups,
the second flanging is arranged at the vertical lower end of the guide fin and is horizontally arranged; and/or the number of the groups of groups,
the third flanging is arranged in the middle of the guide fin, is vertically arranged and is perpendicular to the guide fin;
the first flange, the second flange and the third flange all protrude towards the same side of the guide fins, and the protruding lengths are the same and are used for determining the sheet distance between the adjacent guide fins during assembly.
Preferably, the guide fin is provided with an assembly through hole extending in a thickness direction of the guide fin.
Preferably, the guide fins are arranged in a straight plate strip-shaped or wave-shaped strip-shaped structure, and one length edge of each guide fin is connected with the heat exchange tube in a matched mode.
Preferably, the width of the guide fin is 5-30mm, and the thickness is 0.08-0.15mm.
Preferably, the guide fins are arranged along the vertical direction or are obliquely arranged relative to the vertical direction, and the oblique angle is an acute angle.
Preferably, when the microchannel heat exchanger comprises the heat exchange fins, the heat exchange fins are in a sharp angle wave shape, and comprise a first unit plate and a second unit plate which are connected to form a sharp angle, and the guide fins are arranged parallel to the first unit plate or the second unit plate.
According to another aspect of the invention, there is also provided an air conditioner including the microchannel heat exchanger.
The invention has the beneficial effects that:
1. the flow guide groove is arranged on the outer wall of the heat exchange tube, so that condensed water or defrosting water stored in the outer wall of the tube can be at least partially collected into the flow guide groove and discharged through the flow guide groove, the water storage quantity on the outer wall of the heat exchange tube is reduced, the frosting quantity of the outer wall of the heat exchange tube is reduced under a low-temperature working condition, and the heat exchange efficiency of the heat exchange tube is improved;
2. the guide fins are arranged on the windward side of the heat exchange tube, so that the heat exchange area of the windward side is increased, the heat exchange capacity of the micro-channel heat exchanger is improved, accumulated water on the heat exchange tube can be guided to flow onto the guide fins directly or in a mode of forming a guide flow channel by matching with the guide grooves, frosting mainly occurs at the guide fins, the frosting quantity on the heat exchange fins between the heat exchange tube and the heat exchange tube is reduced, and the heat exchange efficiency of the micro-channel heat exchanger is improved. The water on the guide fins can flow down quickly along the guide fins which are vertically arranged, and the frost on the guide fins can be separated from the micro-channel heat exchanger quickly in the defrosting process, so that the purpose of promoting the micro-channel heat exchanger to drain water or defrost quickly is achieved.
Drawings
FIG. 1 is a schematic view of a microchannel heat exchanger according to the present invention;
FIG. 2 is an enlarged view of a partial structure of the microchannel heat exchanger of the present invention at B;
FIG. 3 is a cross-sectional view of a microchannel heat exchanger of the present invention taken along line A-A;
FIG. 4 is a front view of a guide fin according to the present invention;
FIG. 5 is a side view of a guide fin according to the present invention;
fig. 6 is a right side view of the first header of the present invention;
fig. 7 is a schematic view of another embodiment of a microchannel heat exchanger according to the present invention.
In the figure: 1. a heat exchange tube; 11. an upper wall surface; 2. a flow guiding groove; 3. a heat exchange fin; 31. a trough; 32. a peak; 33. a windowing structure; 34. a first unit plate; 35. a second unit plate; 4. a guide fin; 41. a first flanging; 42. a second flanging; 43. a third flanging; 44. a notch; 45. assembling the through hole; 5. a first header; 51. a flat tube groove; 6. and a second collecting pipe.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description refers to the specific implementation, structure, characteristics and effects according to the present invention application with reference to the accompanying drawings and preferred embodiments. In the following description, particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
According to one aspect of the present invention, there is provided a microchannel heat exchanger comprising a heat exchange tube 1; the outer wall of the heat exchange tube 1 is provided with a flow guide groove 2, and the flow guide groove 2 can collect and guide liquid on the outer wall of the heat exchange tube 1 so as to reduce the accumulation amount of the liquid on the outer wall of the heat exchange tube 1. When the heat exchange tube 1 is used as an evaporator in a heat pump system, water vapor in the external environment often condenses on the outer wall of the heat exchange tube 1 to form condensed water or solidifies into frost to be coated on the outer wall of the heat exchange tube 1 due to lower tube wall temperature, so that the heat exchange efficiency of the heat exchange tube 1 is reduced. The thickness of the frost layer coated on the outer wall of the tube or the water accumulation amount is reduced, which is beneficial to improving the overall heat exchange efficiency of the micro-channel heat exchanger. According to the invention, the diversion grooves 2 are arranged on the outer wall of the heat exchange tube 1, and the diversion grooves 2 can play roles of converging liquid and guiding liquid to flow, so that condensed water accumulated at the outer wall of the heat exchange tube 1 or defrosting water formed in the defrosting process can be at least partially converged into the diversion grooves 2 and discharged through the diversion grooves 2 and leave the outer wall of the heat exchange tube 1, thereby achieving the effect of reducing the water accumulation on the outer wall of the heat exchange tube 1, reducing the thickness of a water layer on the outer wall of the tube, reducing the thickness of an upper frosted layer of the heat exchange tube 1 when the micro-channel heat exchanger is used as an evaporator in a heat pump system under a low-temperature working condition, and being beneficial to improving the heat exchange efficiency of the micro-channel heat exchanger.
As a preferred embodiment, the heat exchange tube 1 is a flat tube horizontally arranged, and includes an upper wall 11, and the flow guiding groove 2 is disposed at the upper wall 11. Specifically, the microchannel heat exchanger is preferably a light-weight microchannel heat exchanger with high heat exchange efficiency, and comprises a plurality of heat exchange tubes 1. The heat exchange tube 1 is a flat tube, and a plurality of hole-shaped passages for heat exchange fluid to pass through and arranged along the length direction of the flat tube are arranged in the flat tube so as to increase the heat convection area of the side of the refrigerant. The upper wall 11 is a portion of the outer wall of the heat exchange tube 1 located at the vertical top when the flat tube is horizontally disposed, and is generally in a strip shape, and the upper wall 11 is directed away from the gravitational force, so that it is the portion of the heat exchange tube 1 where liquid (mainly condensed water and frosted water) is most likely to accumulate. The guide groove 2 is arranged at the upper wall surface 11, so that water at the upper wall surface 11 can be guided to flow along the guide groove 2 and be smoothly discharged, and the purpose of reducing the water accumulation amount of the upper wall surface 11 is achieved.
As a preferred embodiment, the upper wall 11 is inclined with respect to the horizontal plane, preferably at a preset angle of not more than 30 ° with respect to the horizontal plane (as shown in fig. 6, the preset angle is equal to the angle γ in fig. 5), so as to promote the drainage of the liquid on the upper wall 11. More specifically, the central axis of the heat exchange tube 1 is horizontally arranged, so that the heat exchange tube 1 rotates around its own central axis, the upper wall surface 11 can be inclined relative to the horizontal plane, and a preset included angle is formed between the upper wall surface 11 and the horizontal plane, which is beneficial to further accelerating the drainage process of the diversion groove 2, promoting the accumulated water on the upper wall surface 11 to be discharged through the diversion groove 2 or directly through the inclined upper wall surface 11, and promoting the accumulated water on the heat exchange fin 3 to flow onto the upper wall surface 11 of the heat exchange tube 1 or be directly discharged when the heat exchange fin 3 is arranged between the heat exchange tubes 1. With the increase of the preset included angle between the upper wall 11 and the horizontal plane, the drainage speed increases, but the space between the adjacent heat exchange tubes 1 for arranging the heat exchange fins 3 will be reduced, so that the preset included angle is preferably smaller than 30 degrees, so that the effective heat exchange area of the microchannel heat exchanger is not excessively reduced while the beneficial effects are ensured.
As a preferred embodiment, at the upper wall surface 11, the guide groove 2 is disposed in a direction perpendicular to the central axis of the heat exchange tube 1 so that the guide groove 2 can traverse the heat exchange tube 1 in the width direction of the heat exchange tube 1 with the shortest groove length, preferably, as shown in fig. 3, the left end of the guide groove 2 is located at the top of the left side wall of the heat exchange tube 1, one end opening of the guide groove 2 is formed, the right end of the guide groove 2 is located at the top wall of the right side wall in the heat exchange tube 1, and the other end opening of the guide groove 2 is formed, at this time, the length of the guide groove 2 is equal to the width of the upper wall surface 11 in the direction perpendicular to the central axis of the heat exchange tube 1. The water flowing into the flow guiding groove 2 can flow out of the flow guiding groove 2 through the two end openings, thereby leaving the heat exchange tube 1. The guide groove 2 extending perpendicular to the central axis of the heat exchange tube 1 is beneficial to reducing the overall processing length of the guide groove 2, reducing the processing cost and improving the processing efficiency. The guiding groove 2 may also include only one end opening, for example, the length of the guiding groove 2 is smaller than the width of the upper wall 11 along the direction perpendicular to the central axis of the heat exchange tube 1, and only one end of the guiding groove 2 is disposed at the edge of the side wall of the heat exchange tube 1, so as to form the end opening for water to flow out.
Because the converging and drainage of the flow guiding groove 2 has a certain effective action area, when the distance between the accumulated water at the upper wall surface 11 and the flow guiding groove 2 is far, the drainage action of the flow guiding groove 2 on the flow guiding groove is reduced. Therefore, as a preferred embodiment, the number of the diversion grooves 2 is plural, and the diversion grooves 2 are distributed in parallel on the upper wall 11, so that the accumulated water on each place on the upper wall 11 can be effectively collected and drained through the diversion grooves 2 nearby, which is beneficial to averaging the drainage capacity on each place on the upper wall 11.
As a preferred embodiment, the heat exchange tubes 1 are arranged at intervals vertically, and wavy heat exchange fins 3 are arranged between two adjacent heat exchange tubes 1, and the heat exchange fins 3 are preferably windowed fins, so that the microchannel heat exchanger has higher heat exchange capacity and heat exchange efficiency; the heat exchange fin 3 includes a plurality of wave troughs 31, for example, as shown in fig. 1 and 7, the microchannel heat exchanger may further include a first collecting pipe 5 and a second collecting pipe 6 which are vertically arranged and spaced apart from each other by a certain distance, and the heat exchange tube 1 is a flat tube. The first collecting pipe 5 and the second collecting pipe 6 are respectively provided with a flat pipe groove 51 with the same width and the same height as the cross section of the flat pipe, and the flat pipe grooves are used for being assembled and connected with two ends of the flat pipe, so that the flat pipe can be communicated with the first collecting pipe 5 and the second collecting pipe 6. The heat exchange fins 3 arranged between two adjacent heat exchange tubes 1 can be formed by stamping multiple times of aluminum foils to form waves, the spans of the heat exchange fins 3 in the length direction are equal to the lengths of the flat tubes, the widths of the heat exchange fins 3 are equal to the widths of the flat tubes, and a windowing structure 33 is arranged in the middle of each heat exchange fin 3 and used for turbulent flow of an air flow field and reinforcing wind side heat exchange. The heat exchange fin 3 includes a plurality of peaks 32 at the upper portion and a plurality of valleys 31 at the lower portion, the plurality of peaks 32 are all connected with the bottom surface of the heat exchange tube 1 above the heat exchange fin 3, and the plurality of valleys 31 are all connected with the top surface (i.e., the upper wall surface 11) of the heat exchange tube 1 below the heat exchange fin 3. During assembly, the heat exchange fins 3 are placed between two upper and lower adjacent flat pipes and can be fixed through furnace welding. The distance between two adjacent flow guiding grooves 2 is 1-5 times of the distance between two adjacent wave troughs 31 of the heat exchange fin 3. More preferably, the distance between two adjacent flow guiding grooves 2 is 2-3 times the distance between two adjacent wave troughs 31 of the heat exchange fin 3, and as shown in fig. 1, the distance between two adjacent flow guiding grooves 2 is 2 times the distance between two adjacent wave troughs 31. The optional distance range can reduce the number of grooves on the heat exchange tube 1 as much as possible while guaranteeing the drainage effect of the diversion groove 2, reduce the complexity of the processing technology, improve the processing efficiency and reduce the processing cost. Preferably, as shown in fig. 1, the flow guiding groove 2 is provided on the upper wall 11 at a position opposite to the peak 32. The heat exchange fin 3 is preferably provided with a window structure 33 capable of disturbing the fluid flowing through the heat exchange fin 3, for example, a shutter structure as shown in fig. 3, and when the air flows through the heat exchange fin 3, the window structure 33 can increase the turbulence effect on the air flow, reduce the boundary layer, and thereby improve the heat exchange capability of the heat exchange fin 3.
As a preferred embodiment, as shown in fig. 1 and fig. 2, the flow guiding groove 2 is a wedge-shaped groove, and includes a first slope surface and a second slope surface which are connected, and an included angle between the first slope surface and the second slope surface, that is, a wedge-shaped opening angle α of the wedge-shaped groove is 60 ° -120 °, and a groove width d is 0.5-2mm, so that the water accumulated on the outer wall of the heat exchange tube 1 can be smoothly collected into the wedge-shaped groove and smoothly discharged from the groove, thereby avoiding the problem that the water accumulated cannot smoothly flow out of the groove due to too small or too narrow groove opening angle, and being beneficial to improving the drainage smoothness of the flow guiding groove 2. In addition, the groove depth h of the wedge-shaped groove can be set to be not more than half of the thickness of the wall of the heat exchange tube 1, so that the part, provided with the flow guide groove 2, on the wall of the heat exchange tube 1 has enough mechanical strength, and the use reliability and safety of the heat exchange tube 1 are ensured.
As a preferred embodiment, the microchannel heat exchanger further comprises guide fins 4; the guide fins 4 are fixed on the side wall of the windward side of the heat exchange tube 1 so as to guide the liquid on the outer wall of the heat exchange tube 1 to flow onto the guide fins 4. The guide fins 4 are in contact connection with the heat exchange tube 1, so that a heat dissipation effect can be achieved, the air side heat exchange area of the microchannel heat exchanger can be increased, and the heat exchange quantity can be improved. Meanwhile, the guide fins 4 are in contact connection with the side wall of the windward side of the micro-channel heat exchanger, and water on the side wall of the windward side of the heat exchange tube 1 can flow onto the guide fins 4 under the guiding action of the guide fins 4 and downwards flow along the guide fins 4 until being separated from the guide fins 4, and is discharged from the micro-channel heat exchanger. When the thickness of the water layer at the windward side wall of the heat exchange tube 1 decreases, water accumulated at other portions on the outer wall of the heat exchange tube 1 tends to flow to the windward side wall and continue to flow to the guide fins 4, being discharged through the guide fins 4. The guide fins 4 can play a good role in draining and guiding water, and are beneficial to reducing the accumulated water quantity on the heat exchange tube 1 and the heat exchange fins 3. Under the condition that the micro-channel heat exchanger is used as an evaporator under the low-temperature working condition, the main frosting part of the micro-channel heat exchanger is transferred to the guide fins 4, and experiments prove that the frosting quantity on the guide fins 4 can reach more than 80% of the total frosting quantity of the micro-channel heat exchanger, so that the frosting quantity on the heat exchange tubes 1 and the heat exchange fins 3 between the heat exchange tubes 1 is greatly reduced, and the heat exchange capability of the micro-channel heat exchanger under the condition is improved. When defrosting operation is carried out, because the guide fins 4 are vertically arranged, defrosting water formed by melting can flow down rapidly along the guide fins 4 which are vertically arranged, frost layers which are not completely melted into water can be separated from the guide fins 4 rapidly due to the action of gravity, the accumulation water quantity on the guide fins 4 can be reduced rapidly, the defrosting efficiency is improved, the defrosting times are reduced, a small quantity of frost quantity on the outer wall of the heat exchange tube 1 and the heat exchange fins 3 can be discharged rapidly through the guide effect of the guide grooves 2 and the guide fins 4 after melting, and the whole micro-channel heat exchanger has higher defrosting and draining efficiency.
As a preferred embodiment, on one heat exchange tube 1, the number of the guide fins 4 is the same as the number of the guide grooves 2, and the guide fins 4 are arranged in a one-to-one correspondence with the guide grooves 2. Preferably, as shown in fig. 3, when one end of the guiding groove 2 is located at the side wall of the heat exchange tube 1 facing the wind, the guiding fin 4 is disposed at the one end, and cooperates with the guiding groove 2 to form a guiding path. The guide passage can extend to the guide fins 4 from the lee side of the guide groove 2, so that condensed water or defrosting water accumulated on the outer wall of the heat exchange tube 1 is promoted to be rapidly discharged, the frosting amount of the outer wall of the heat exchange tube 1 under a low-temperature working condition is further reduced, and the efficiency of the micro-channel heat exchanger is improved.
As a preferred embodiment, a notch 44 is provided at the edge of the guide fin 4 matching with the heat exchange tube 1, and the shape of the notch 44 is adapted to the shape of the side wall of the heat exchange tube 1 on the windward side. When the guide fins 4 are installed, the notches 44 are matched and spliced with the side wall of the windward side of the heat exchange tube 1, and the guide fins 4 are preferably fixed in a furnace welding mode, so that stable installation of the guide fins 4 on the outer wall of the heat exchange tube 1 can be realized. As shown in fig. 3, the side wall of the heat exchange tube 1 on the windward side is circular arc-shaped, and the notches 44 on the guide fins 4 are also circular arc-shaped to be matched with the notches. The gaps 44 can increase the contact area between the guide fins 4 and the outer wall of the heat exchange tube 1, so that the stability and reliability of the fixing structure between the guide fins 4 and the heat exchange tube 1 are improved.
As a preferred embodiment, when the microchannel heat exchanger comprises a plurality of the heat exchange tubes 1, the guide fins 4 comprise a plurality of the notches 44; the notches 44 are in one-to-one correspondence with and matched with the heat exchange tubes 1, so that the guide fins 4 can be in fit connection with all the heat exchange tubes 1. For example, as shown in fig. 3, the plurality of heat exchange tubes 1 are arranged vertically in parallel at equal intervals, and the plurality of notches 44 on the guide fins 4 are also arranged vertically in equal intervals sequentially, so that each notch 44 can be correspondingly connected with one heat exchange tube 1, thereby forming a relatively stable fixing structure between one guide fin 4 and each heat exchange tube 1, and being beneficial to further improving the installation stability and reliability of the guide fins 4. Meanwhile, the number of parts of the micro-channel heat exchanger is reduced, one guide fin 4 can guide accumulated water on a plurality of heat exchange tubes 1 at the same time, drainage efficiency is improved, and assembling steps of the guide fin 4 and the heat exchange tubes 1 are simplified.
As a preferred embodiment, the guide fin 4 further comprises: the first flange 41 is arranged at the vertical upper end of the guide fin 4, the first flange 41 can be formed by bending the upper end of the guide fin 4 to one side of the fin, the operation is simple, and the formed first flange 41 is horizontally arranged; and/or, a second flange 42 disposed at the vertical lower end of the guide fin 4, similar to the first flange 41, the second flange 42 may also be formed by bending the lower end of the guide fin 4, and disposed horizontally; and/or, a third flange 43 is disposed in the middle of the guide fin 4, and the third flange 43 is vertically disposed and perpendicular to the guide fin 4; the first flange 41, the second flange 42 and the third flange 43 all protrude towards the same side of the guide fin 4, and the protruding lengths are the same, so as to determine the sheet distance between the adjacent guide fins 4 during assembly. As shown in fig. 4 and 5, for convenience of assembly, the first flange 41, the second flange 42 and the third flange 43 are provided on the guide fins 4 at the same time so that the pitches between the adjacent two guide fins 4 from top to bottom are kept equal.
As a preferred embodiment, the guide fins 4 are provided with two assembly through holes 45 extending along the thickness direction of the guide fins 4, as shown in fig. 4 and 5, and one of the assembly through holes 45 is disposed at the vertical upper portion of the guide fins 4, and the other is disposed at the vertical lower portion of the guide fins 4. When the guide fins 4 are assembled to the heat exchange tube 1, a plurality of guide fins 4 are taken, graphite rods (or other bars which are high-temperature resistant and are not welded and fixed with the guide fins 4) are adopted to sequentially pass through the assembly through holes 45 at the upper parts of the guide fins 4, and a graphite rod is taken to sequentially pass through the assembly through holes 45 at the lower parts of the guide fins 4, so that the guide fins 4 are sequentially arranged in a row to form a preassembled structure. Wherein, the end of at least one flanging on one guide fin 4 is abutted against one side of the adjacent guide fin 4, which is not provided with a flanging, the distance between the flanges is determined by the protruding length of the first flanging 41 and/or the second flanging 42 and/or the third flanging 43 towards one side of the fin, and the distance between the flanges is preferably equal to the distance between two adjacent guide grooves 2, so that each guide fin 4 can be matched and installed at the guide groove 2. And then the preassembled rows of guide fins 4 are matched with the heat exchange tube 1 through the gaps 44 on the guide fins 4, and the guide fins 4 are fixed by furnace welding, so that the installation of the guide fins 4 is completed.
As a preferred embodiment, the guide fins 4 are arranged in a straight strip-shaped or wave-shaped strip-shaped structure, and the length edges of the wave-shaped strip-shaped structure are wave-shaped; the guide fins 4 arranged in the wave shape have better mechanical strength so as to prevent the guide fins 4 from being broken and inverted; one longitudinal edge of the guide fin 4 is connected with the heat exchange tube 1 in a matching way, and the notch 44 is formed at the position of the longitudinal edge. Preferably, the guide fins 4 are made of aluminum foils with good heat conduction performance, smaller density and processability, the width is 5-30mm, and properly increasing the width of the guide fins 4 in the width range is beneficial to increasing the heat exchange area of the wind side and improving the heat exchange capacity of the micro-channel heat exchanger, but the fin width is not too large so as to avoid the problem of rewinding. The thickness of the guide fin 4 is 0.08-0.15mm.
As a preferred embodiment, the guide fins 4 are disposed in a vertical direction or are disposed obliquely to the vertical direction, and the oblique angle is an acute angle. Whether vertically or obliquely with respect to the vertical, the guide fins 4 are able to guide the water thereon to remain in the direction of gravity. The direction of the guide fins 4 has a certain influence on the flow pattern of the air flowing into the microchannel heat exchanger, for example, preferably, as shown in fig. 7, when the microchannel heat exchanger includes the heat exchange fins 3, the heat exchange fins 3 have a pointed wave shape including a first unit plate 34 and a second unit plate 35 connected to form a pointed corner; the guide fins 4 are arranged parallel to the first unit plate 34 or the second unit plate 35, which is advantageous in optimizing the air flow pattern. Specifically, compared with the situation that the guide fins 4 are vertically placed, the air resistance caused by the inclined guide fins 4 to the air is smaller, so that the processes of turbulence, boundary layer reduction and heat exchange enhancement of the micro-channel heat exchanger to the air are mainly concentrated on the heat exchange fins 3 between the adjacent heat exchange tubes 1, especially at the window opening structure 33 of the heat exchange fins 3, and the excessive blocking of the flow of the heat exchange air flow by the guide fins 4 is avoided.
According to another aspect of the invention, an air conditioner is provided, comprising the microchannel heat exchanger, and the air conditioner can be an automobile air conditioner or other air conditioning systems applied to special working conditions.
In summary, it is easily understood by those skilled in the art that the above-mentioned advantageous ways can be freely combined and superimposed without conflict.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any person who is in the light of the present invention can obtain other products in various forms, however, any change in shape or structure is within the scope of the present invention, and all the technical solutions that are the same or similar to the present application are included.
Claims (18)
1. A microchannel heat exchanger characterized by comprising a heat exchange tube (1);
the outer wall of the heat exchange tube (1) is provided with a diversion groove (2), and the diversion groove (2) can collect and divert liquid on the outer wall of the heat exchange tube (1) so as to reduce the accumulation of the liquid on the outer wall of the heat exchange tube (1); the heat exchange tube (1) is a flat tube and comprises an upper wall surface (11), and the flow guide groove (2) is arranged at the upper wall surface (11); the central axis of the heat exchange tube (1) is horizontally arranged, the heat exchange tube (1) rotates around the central axis of the heat exchange tube (1) so that the upper wall surface (11) inclines relative to the horizontal plane to form a preset included angle, and a plurality of heat exchange tubes (1) are arranged in parallel and equidistant mode and vertically arranged; at the upper wall surface (11), the flow guide grooves (2) are arranged in an extending manner along the direction perpendicular to the central axis of the heat exchange tube (1), and the number of the flow guide grooves (2) is multiple; the micro-channel heat exchanger further comprises guide fins (4), the guide fins (4) are fixed on the side wall of the windward side of the heat exchange tube (1) so as to guide liquid on the outer wall of the heat exchange tube (1) to flow onto the guide fins (4), the number of the guide fins (4) is the same as that of the guide grooves (2) on one heat exchange tube (1), and the guide fins (4) are in one-to-one correspondence with the guide grooves (2).
2. The microchannel heat exchanger of claim 1 wherein the heat exchanger is configured to heat the heat exchange fluid,
the plurality of guide grooves (2) are arranged in parallel at the upper wall surface (11).
3. The microchannel heat exchanger according to claim 2, wherein a plurality of the heat exchange tubes (1) are arranged at vertical intervals, and wavy heat exchange fins (3) are arranged between two adjacent heat exchange tubes (1);
the heat exchange fin (3) comprises a plurality of wave troughs (31), and the distance between two adjacent flow guide grooves (2) is 1-5 times of the distance between two adjacent wave troughs (31) of the heat exchange fin (3).
4. A microchannel heat exchanger according to claim 3, wherein the distance between two adjacent flow guiding grooves (2) is 2-3 times the distance between two adjacent wave troughs (31) of the heat exchange fin (3).
5. The microchannel heat exchanger as set forth in claim 3 or 4, wherein,
the heat exchange fin (3) comprises a plurality of wave crests (32), and the flow guide grooves (2) are arranged on the upper wall surface (11) at positions opposite to the wave crests (32).
6. A microchannel heat exchanger according to claim 3, wherein the heat exchange fins (3) are provided with a fenestration (33) capable of disturbing the flow of fluid through the heat exchange fins (3).
7. The microchannel heat exchanger as set forth in any one of claims 1 to 4,
the diversion groove (2) is a wedge-shaped groove, the opening angle of the wedge-shaped groove is 60-120 degrees, and the width of the groove is 0.5-2mm; and/or the groove depth of the flow guide groove (2) is not more than half of the thickness of the pipe wall of the heat exchange pipe (1).
8. The microchannel heat exchanger according to claim 1, wherein the guide fin (4) is arranged at one end of the guide groove (2) when the end is located at a side wall of the heat exchange tube (1) on the windward side, and cooperates with the guide groove (2) to form a guide passage.
9. Microchannel heat exchanger according to claim 1, characterized in that the edge of the guide fin (4) cooperating with the heat exchange tube (1) is provided with a notch (44), the shape of the notch (44) being adapted to the shape of the side wall of the windward side of the heat exchange tube (1).
10. The microchannel heat exchanger according to claim 9, wherein the guide fin (4) comprises a plurality of the indentations (44) when the microchannel heat exchanger comprises a plurality of the heat exchange tubes (1);
the notches (44) are in one-to-one correspondence with the heat exchange tubes (1) and are matched with the heat exchange tubes, so that the guide fins (4) can be connected with all the heat exchange tubes (1) in an adaptive mode.
11. Microchannel heat exchanger according to claim 9 or 10, characterized in that the indentations (44) of the guide fins (4) are fixedly connected by welding to the side wall of the heat exchange tube (1) on the windward side.
12. The microchannel heat exchanger according to claim 1, wherein the guide fins (4) further comprise:
the first flanging (41) is arranged at the vertical upper end of the guide fin (4), and the first flanging (41) is horizontally arranged; and/or the number of the groups of groups,
the second flanging (42) is arranged at the vertical lower end of the guide fin (4), and the second flanging (42) is horizontally arranged; and/or the number of the groups of groups,
the third flanging (43) is arranged in the middle of the guide fin (4), and the third flanging (43) is vertically arranged and perpendicular to the guide fin (4);
the first flange (41), the second flange (42) and the third flange (43) all protrude towards the same side of the guide fins (4), and the protruding lengths are the same and are used for determining the sheet distance between the adjacent guide fins (4) during assembly.
13. A microchannel heat exchanger according to claim 1, wherein the guide fins (4) are provided with fitting through holes (45) extending in the thickness direction of the guide fins (4).
14. The microchannel heat exchanger of claim 1 wherein the heat exchanger is configured to heat the heat exchange fluid,
the guide fins (4) are arranged in a straight plate strip-shaped or wave-shaped strip-shaped structure, and one length edge of each guide fin (4) is connected with the heat exchange tube (1) in a matched mode.
15. The microchannel heat exchanger according to claim 14, wherein the guide fins (4) have a width of 5-30mm and a thickness of 0.08-0.15mm.
16. The microchannel heat exchanger according to claim 1, wherein the guide fins (4) are arranged vertically or inclined with respect to the vertical, the inclination angle being an acute angle.
17. The microchannel heat exchanger according to claim 16, wherein when the microchannel heat exchanger comprises heat exchange fins (3), the heat exchange fins (3) are in the shape of pointed waves, comprising a first cell plate (34) and a second cell plate (35) connected to form pointed corners, the guide fins (4) being arranged parallel to the first cell plate (34) or the second cell plate (35).
18. An air conditioner comprising the microchannel heat exchanger of any one of claims 1-17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029531.3A CN107860248B (en) | 2017-10-27 | 2017-10-27 | Microchannel heat exchanger and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029531.3A CN107860248B (en) | 2017-10-27 | 2017-10-27 | Microchannel heat exchanger and air conditioner |
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| Publication Number | Publication Date |
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| CN107860248A CN107860248A (en) | 2018-03-30 |
| CN107860248B true CN107860248B (en) | 2023-12-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109099748A (en) * | 2018-08-30 | 2018-12-28 | 珠海格力电器股份有限公司 | Heat exchanger tube and air conditioner |
| CN110779197B (en) * | 2019-11-25 | 2021-07-30 | 深圳市博一环境建设工程有限公司 | Anti-drying air conditioner heat exchanger |
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| CN105864888A (en) * | 2016-04-01 | 2016-08-17 | 海信（山东）空调有限公司 | Microchannel heat exchanger and air conditioner |
| CN206222968U (en) * | 2016-10-17 | 2017-06-06 | 珠海格力电器股份有限公司 | Flat tube, micro-channel heat exchanger and air-conditioning |
| CN207816049U (en) * | 2017-10-27 | 2018-09-04 | 珠海格力电器股份有限公司 | A kind of micro-channel heat exchanger and air-conditioning |
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| KR20040017968A (en) * | 2002-08-23 | 2004-03-02 | 엘지전자 주식회사 | Drainage structure for regenerator |
| JP2012037092A (en) * | 2010-08-04 | 2012-02-23 | Sharp Corp | Heat exchanger, and air conditioner with the same |
| CN105135753A (en) * | 2015-08-12 | 2015-12-09 | 浙江康盛热交换器有限公司 | Micro channel heat exchanger for heat pump air conditioner |
| CN105864888A (en) * | 2016-04-01 | 2016-08-17 | 海信（山东）空调有限公司 | Microchannel heat exchanger and air conditioner |
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| CN107860248A (en) | 2018-03-30 |
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