CN102767982A - Louver fin and heat exchanger adopting louver fins - Google Patents

Louver fin and heat exchanger adopting louver fins Download PDF

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Publication number
CN102767982A
CN102767982A CN2012102238744A CN201210223874A CN102767982A CN 102767982 A CN102767982 A CN 102767982A CN 2012102238744 A CN2012102238744 A CN 2012102238744A CN 201210223874 A CN201210223874 A CN 201210223874A CN 102767982 A CN102767982 A CN 102767982A
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CN
China
Prior art keywords
water conservancy
conservancy diversion
heat exchanger
window
air
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Granted
Application number
CN2012102238744A
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Chinese (zh)
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CN102767982B (en
Inventor
葛方根
施骏业
朱兴军
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Zhuhai Dun'an Thermal Engineering Technology Co., Ltd.
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Zhejiang Dunan Artificial Environment Co Ltd
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Priority to CN201210223874.4A priority Critical patent/CN102767982B/en
Publication of CN102767982A publication Critical patent/CN102767982A/en
Application granted granted Critical
Publication of CN102767982B publication Critical patent/CN102767982B/en
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Abstract

The invention discloses a louver fin and a heat exchanger adopting the louver fins, in particular to a microchannel heat exchanger, and solves the technical problem that fins of the conventional heat exchanger have high possibility of ash clogging, resulting in lowered performances of the heat exchanger. The louver fin provided by the invention includes a base sheet and louvered fins formed on the base sheet, wherein an air flow passage is formed between the adjacent louvered fins; and flow guide projections are arranged on the base sheet, and correspond to air inlets of the air flow passages. The louver fin provided by the invention can be applied to various heat exchangers and microchannel heat exchangers in the field of household/commercial air conditioners, can remarkably improve the ash accumulation of the air side of the heat exchanger, and improves the heat exchange performance of heat exchangers, particularly the microchannel heat exchangers.

Description

A kind of louvered fin and adopt the heat exchanger of this fin
Technical field
The present invention relates to a kind of heat exchanger, especially the fin of heat exchanger.
Background technology
Micro-channel heat exchanger is a kind of high-performance heat exchanger, and its flat tube adopts MCA, compares existing common heat exchanger, and micro-channel heat exchanger can be strengthened and condenses and boiling heat transfer, significantly improves the refrigerant side heat exchange efficiency.In order to improve heat exchange property, be typically provided with fin between the flat tube of heat exchanger.Micro-channel heat exchanger has in light weight, compact conformation, the advantage that heat exchange efficiency is high, instead of copper material (national strategy reserved resources) and tool cost advantage; Simultaneously, the characteristics that its internal capacity is little help significantly reducing refrigerant charge, meet the trend of energy-conserving and environment-protective.
Existing micro-channel heat exchanger is the purpose that reaches enhanced heat exchange, and fin adopts the shutter form, and the fenestration of louvered fin can make air flow boundary layer periodic interruptions, simultaneously air stream is play the guiding role, thereby realizes the air enhanced heat exchange.But applying of the heat exchanger of this employing louvered fin still faces many problems and challenge, and wherein the air side fouling phenomenon is exactly a wherein very important problem.In family expenses/business air conditioner field; Because the heat exchanger face velocity is lower, generally at 1.5m/s ~ 2.5m/s, micro-channel heat exchanger is compared with traditional heat exchangers; It is stifled more be prone to produce ash, thus especially the shutter place of windowing more easy blocking cause the product exchange capability of heat sharply to descend.Experimental result shows, under the common environment for use of China, after two months, dust stratification causes systematic energy efficiency ratio to descend 10%; After half a year, the system energy efficiency specific damping can reach 30%, and system energy consumption significantly rises, and the pipe type heat exchanger Energy Efficiency Ratio of kindred circumstances only descends 1.5%.To sum up, the dust stratification problem has become and has hindered one of subject matter that micro-channel heat exchanger uses in family expenses/business air conditioner field large-scale promotion, for this reason, underlying issue research of micro-channel heat exchanger air side fouling phenomenon is had crucial meaning.
Summary of the invention
The object of the invention just provides a kind of louvered fin, can obviously improve heat exchanger air side fouling phenomenon, improves the heat exchange property of heat exchanger, particularly micro-channel heat exchanger.
Another object of the present invention is to provide a kind of heat exchanger that adopts louvered fin of the present invention.
For solving the problems of the technologies described above; The present invention adopts following technical scheme: a kind of louvered fin, and comprise substrate and be formed on said on-chip window wing, form gas channel between the adjacent windows wing; Said substrate is provided with the water conservancy diversion convexity, and said water conservancy diversion is protruding corresponding with the air inlet of said gas channel.
Further, said substrate by air-flow direction be divided into inlet portion, the portion of facining the wind, switching-over portion, leeward and export department, said window wing is formed on facing the wind portion and leeward portion, it is protruding at inlet portion said water conservancy diversion to be set at least.
Further, the window wing louver angle of the said portion of facining the wind is identical with said leeward window wing louver angle, and it is in the opposite direction to window.
Further, the said portion of facining the wind is formed with many group window wings, said leeward and is formed with many group window wings, and every group of window wing correspondence in the said portion of facining the wind is equipped with the water conservancy diversion convexity.
Further, said water conservancy diversion is protruding is formed in one with said substrate.
Further, the height that said water conservancy diversion convexity exceeds substrate plane is H1, and the height that said window wing exceeds substrate plane is H2, H1 >=H2.
Further, the distance between said water conservancy diversion convex center and the nearest window center is L, and L satisfies 0.5mm≤L≤2.0mm.
Further, said water conservancy diversion convexity is circular arc, V-arrangement or trapezoidal.
Further, heat exchanger is a micro-channel heat exchanger.
According to another object of the present invention, a kind of heat exchanger is provided, comprise the described louvered fin of above-mentioned arbitrary technical scheme.
Beneficial effect of the present invention: be designed with the water conservancy diversion convexity on the louvered fin provided by the present invention; And the water conservancy diversion convexity is corresponding with the gas channel air inlet between the window wing; The water conservancy diversion convexity can be blocked air-flow most dusts at the middle and upper levels makes it can not get into gas channel, and when the gas shock water conservancy diversion was protruding, the water conservancy diversion convexity can flick the dust in the air-flow; The air-flow that makes dust directly get into directly circulation is taken fin out of; Thereby prevented that effectively the shutter ash is stifled, especially shutter is windowed and is located the stifled phenomenon of ash, thereby guarantees still possess good heat exchange property after the long-term use of heat exchanger; Improve the COP (Coefficient Of Performance, the conversion ratio between energy and the heat) of whole system.In addition,, reduced the wash number of heat exchanger, the service life of also having improved heat exchanger fin simultaneously owing to avoided fouling phenomenon.
Scheme of the present invention usually only increases the water conservancy diversion boss in whole fin air flow inlet portion, and is simple in structure, cost is low, be easy to manufacture; And adopt the increase in the heat exchanger service life that brings after the fin of the present invention, and the air-conditioning COP electricity charge that brought of rising save, the cost that makes structural change bring almost can be ignored, and fin of the present invention has remarkable economic efficiency and social benefit.
Description of drawings
Below in conjunction with accompanying drawing the present invention is done further explanation and explanation:
Fig. 1 is the stifled preceding structural representation of existing heat exchanger fin ash;
Structural representation after Fig. 2 blocks up for existing heat exchanger fin is grey
Fig. 3 is the structural representation of heat exchanger of the present invention;
Fig. 4 is the structural representation (the A-A cutaway view of Fig. 3) of louvered fin embodiment one of the present invention;
Fig. 5 is the B place enlarged drawing of Fig. 4;
Fig. 6 is the structural representation of louvered fin embodiment two of the present invention;
Fig. 7 is the structural representation of louvered fin embodiment three of the present invention;
Fig. 8 is the structural representation of louvered fin embodiment four of the present invention;
Fig. 9 is the structural representation of louvered fin embodiment five of the present invention;
Figure 10 is the structural representation of louvered fin embodiment six of the present invention.
The specific embodiment
With reference to Fig. 1, existing heat exchanger fin has the zone of facining the wind, commutating zone and leeward zone, and zone and leeward zone all form shutter facining the wind; The air shutter in zone of facining the wind of at first flowing through, after the flow through shutter in leeward zone, louvered fin is in enhanced heat exchange; The flow resistance of air also can increase, and this just makes that airborne a part of dust can be attached on the shutter, with reference to Fig. 2; After making for a long time behind the heat exchanger, the window of shutter gathers a large amount of dusts, causes windows narrow or stops up window fully; Shutter has lost the air-flow guide effect, and air can only circulate by straight line, thereby causes the heat exchanger exchange capability of heat sharply to descend.
For this reason, a kind of louvered fin provided by the present invention has substrate and is formed on on-chip window wing; Form gas channel between the adjacent windows wing; Substrate is provided with the water conservancy diversion convexity, and water conservancy diversion is protruding corresponding with the air inlet of gas channel, and the water conservancy diversion convexity can be blocked air-flow most dusts at the middle and upper levels makes it can not get into gas channel; Thereby prevented the shutter dust stratification, especially the shutter place's dust stratification of windowing.
The technical scheme of the embodiment of the invention is made an explanation and explain below in conjunction with the accompanying drawing of the embodiment of the invention, but following embodiment is the preferred embodiments of the present invention only, is not whole.Based on the embodiment in the embodiment, those skilled in the art belong to protection scope of the present invention at following other embodiment that obtains of the prerequisite of not making creative work.
Embodiment one:
With reference to Fig. 4,5; The louvered fin of present embodiment; Comprise substrate 21 and be formed on the window wing 22 on the said substrate 21,22 of adjacent windows wings form gas channel 3, substrate 21 by air-flow direction be divided into inlet portion 23, facing the wind portion 24, switching-over portion 25, leeward 26 and export department 27; Above-mentioned window wing 22 be formed on down with the wind portion 24 with leeward 26; And the window wing 22 louver angle α of the portion 24 of facining the wind are identical with leeward 26 window wing 22 louver angle β, and it is in the opposite direction to window, and inlet portion 23 is provided with a water conservancy diversion protruding 28.Generally speaking, air-flow gets into fin from inlet portion 23, after through water conservancy diversion protruding 28; The dust of the overwhelming majority is blocked or is flicked in the air, and the dust that flicks directly gets into the directly air-flow of circulation, and air-flow is walked around protruding 28 backs of water conservancy diversion and got into the portion 24 of facining the wind; Through the guiding of the portion's 24 overdraught passages 3 that facing the wind, changed the direction of air-flow, make air-flow flow according to the louver angle of window wing 22; When flowing to the switching-over portion of upper strata substrate; Air-flow commutates once more and gets into leeward 26, and the guiding of leeward 26 overdraught passage of process is accomplished heat transfer process after export department 27 flows out.
Need to prove: have the gap usually between the adjacent two layers substrate 21 of heat exchanger fin; Though shutter is arranged; But portion of air still can directly flow out fin from this gap; Thereby form the directly air-flow of circulation, and this part air-flow that directly circulates can be taken away the dust that is ejected by water conservancy diversion protruding 28.
In the present embodiment; The height that water conservancy diversion protruding 28 exceeds substrate 21 planes is H1; The height that window wing 22 exceeds substrate 21 planes is H2, should satisfy H1 >=H2 so, and water conservancy diversion protruding 28 is accomplished the air inlet that blocks gas channel on the rectilinear direction that air flows like this; Make the air-flow of inlet portion 23 after protruding 28 stop, could to get into to facing the wind the gas channel of 22 of portion's 24 window wings, avoid the part air-flow directly to get into gas channel through water conservancy diversion.
Present embodiment is in practical application; Distance between protruding 28 centers of water conservancy diversion and the nearest window center is L; Consider the blocking effect of processing feasibility and water conservancy diversion protruding 28; L should satisfy 0.5mm≤L≤2.0mm, preferably can be: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm.It is understandable that: during L<0.5mm, the protruding inconvenient machining of water conservancy diversion, and the protruding air that can hinder of water conservancy diversion is through gas channel, during and L>2.0mm, the air-flow that has part is walked around the protruding gas channel that directly gets into of water conservancy diversion, has reduced the protruding blocking effect of water conservancy diversion.
In the present embodiment; Water conservancy diversion protruding 28 is that trapezoidal, trapezoidal water conservancy diversion convexity has two inclined-planes and a plane, and the inclined-plane of the protruding windward side of water conservancy diversion plays guiding function; Can not form excessive windage; Also avoided simultaneously dust to accumulate in the corner of water conservancy diversion protruding 28 and substrate 21 in a large number, made most dust to be ejected, got in the air-flow of directly circulation by the windward side inclined-plane of water conservancy diversion protruding 28.
Embodiment two:
With reference to Fig. 6, the scheme of present embodiment and embodiment one are roughly the same, and different is: water conservancy diversion protruding 28 is V-arrangement, and in like manner, the water conservancy diversion convexity of V-arrangement has two inclined-planes equally, and its effect can be with reference to embodiment one.
Embodiment three:
With reference to Fig. 7; The scheme of present embodiment and embodiment one are roughly the same, and different is: water conservancy diversion protruding 28 is circular arc, in like manner; Though the water conservancy diversion of circular arc convexity does not have the inclined-plane, its cambered surface can reach the protruding technique effect that is had of trapezoidal water conservancy diversion among the embodiment one equally.
Can know from the description of the foregoing description: the shape of water conservancy diversion protruding 28 includes but not limited to circular arc, V-arrangement or trapezoidal, also can be other shapes, as square or the like, but says that from effect the protruding implementation result of water conservancy diversion with inclined-plane or cambered surface is better.
Embodiment four:
With reference to Fig. 8; The scheme of present embodiment and embodiment one are roughly the same; Different is: inlet portion 23 is provided with two water conservancy diversion protruding 28; Air-flow was passing through two water conservancy diversion at protruding 28 o'clock, and a part of dust can accumulate in two grooves between the water conservancy diversion convexity, so just can further reduce the dust that gets into gas channel.When practical application, the height that the first water conservancy diversion convexity exceeds substrate 21 planes is H1 ', and the height that the second water conservancy diversion convexity exceeds substrate 21 planes is H1, and the height that window wing 22 exceeds substrate 21 planes is H2, so H1 '=H1 >=H2; Perhaps H1 >=H2 only.Distance between the second water conservancy diversion convex center and the nearest window center is L, considers the blocking effect that processing feasibility and water conservancy diversion are protruding, and L should satisfy 0.5mm≤L≤2.0mm, and its effect reference implementation example one no longer details.
Need to prove: first water conservancy diversion convexity is to set gradually by air-flow direction with the second water conservancy diversion convexity.And the protruding quantity of water conservancy diversion of the present invention includes but not limited to one or two, also can be three, four or more.
Embodiment five:
With reference to Fig. 9; The louvered fin of present embodiment; Comprise substrate 21 and be formed on the window wing 22 on the said substrate 21,22 of adjacent windows wings form gas channel, substrate 21 by air-flow direction be divided into inlet portion 23, facing the wind portion 24, switching-over portion 25, leeward 26 and export department 27; Above-mentioned window wing 22 be formed on down with the wind portion 24 with leeward 26; And window wing 22 louver angles of the portion 24 of facining the wind are identical with leeward 26 window wing 22 louver angles, and it is in the opposite direction to window, and inlet portion 23 is provided with a water conservancy diversion convexity.But be formed with three groups of window wings in the portion 24 of facining the wind, leeward 26 symmetry be formed with three groups of window wings, every group of window wing correspondence in the portion 24 of facining the wind is equipped with water conservancy diversion protruding 28; Can certainly be at inlet portion 23 a continuous water conservancy diversion convexity to be set, this water conservancy diversion convexity can be blocked the air inlet of corresponding window wing group overdraught passage on the rectilinear direction that air flows.The louvered fin of present embodiment, when air when the fin, not only can augmentation of heat transfer, can also reduce air flow resistance.
Simple change as present embodiment: can be that the portion of facining the wind 24 forms to organize the window wings more, and one group of window wing of leeward 26 formation, 24 in the portion of perhaps facining the wind forms one group of window wing, and the window wings are organized in leeward 26 formation more; In addition, the portion 24 of facining the wind can be that rule is arranged with many groups window wing on leeward 26, like rectangular array etc., also can be irregular arranging.The arrangement mode of window wing group also has a lot, no longer details here.
The protruding shape of water conservancy diversion in the present embodiment, position etc. is set all can be with reference to the scheme of previous embodiment.
Embodiment six:
Louvered fin with reference to Figure 10, present embodiment; Comprise substrate 21 and be formed on the window wing 22 on the said substrate 21; 22 of adjacent windows wings form gas channel, substrate 21 by air-flow direction be divided into inlet portion 23, facing the wind portion 24, switching-over portion 25, leeward 26 and export department 27, above-mentioned window wing 22 be formed on down with the wind portion 24 with leeward 26; And window wing 22 louver angles of the portion 24 of facining the wind are identical with leeward 26 window wing 22 louver angles; It is in the opposite direction to window, and inlet portion 23 is provided with a water conservancy diversion convexity, and export department 27 is provided with a water conservancy diversion convexity.Sinuous flow appears in the occasion of installing at heat exchanger; At this moment leeward 26 on the fin also can become portion 24 down with the wind, and air-flow then gets into fin from inlet portion 23 with export department 27 simultaneously, in this case; It is not enough only at inlet portion 23 the water conservancy diversion convexity being set; In export department 27 a water conservancy diversion convexity is set, when sinuous flow appears in installation environment, the dust in the barrier air gets into leeward 26 gas channel for this reason.
The protruding shape of water conservancy diversion in the present embodiment, position etc. is set all can be with reference to the scheme of previous embodiment.
In addition, the water conservancy diversion described in the foregoing description protruding 28 is integrated with substrate 21, saves material and is easy to and make.Certainly do not get rid of and adopt welding to wait other technology, it is protruding in the fin processing later stage water conservancy diversion to be installed.
With reference to Fig. 3, a kind of heat exchanger provided by the present invention has the described louvered fin of above-mentioned arbitrary embodiment; But undoubtedly; Heat exchanger of the present invention also has the header (not shown), structures such as flat tube, and some flat tubes 1 connect to be gone up between header and the lower header; And fin 2 is provided with between adjacent two flat tubes 1, fin 2; Connect into wavy.For micro-channel heat exchanger, in flat tube, be provided with the fine channel that supplies the working medium circulation, micro-channel heat exchanger can be strengthened and condenses and boiling heat transfer, significantly improves the refrigerant side heat exchange efficiency.
The embodiment of the invention is mainly used in the heat exchanger, micro-channel heat exchanger in various family expenses/business air conditioner field etc.
Through the foregoing description, the object of the invention is by in full force and effect having reached.The personage who is familiar with this skill should be understood that the content that the present invention includes but be not limited to describe in the accompanying drawing and the top specific embodiment.Any modification that does not depart from function of the present invention and structural principle all will be included in the scope of claims.

Claims (10)

1. a louvered fin comprises substrate and is formed on said on-chip window wing, and form gas channel between the adjacent windows wing, it is characterized in that: said substrate is provided with the water conservancy diversion convexity, and said water conservancy diversion is protruding corresponding with the air inlet of said gas channel.
2. a kind of louvered fin as claimed in claim 1; It is characterized in that: said substrate by air-flow direction be divided into inlet portion, the portion of facining the wind, switching-over portion, leeward and export department; Said window wing is formed on facing the wind portion and leeward portion, and it is protruding at inlet portion said water conservancy diversion to be set at least.
3. a kind of louvered fin as claimed in claim 2 is characterized in that: the window wing louver angle of the said portion of facining the wind is identical with said leeward window wing louver angle, and it is in the opposite direction to window.
4. a kind of louvered fin as claimed in claim 2 is characterized in that: the said portion of facining the wind is formed with many group window wings, and said leeward is formed with many group window wings, and every group of window wing correspondence in the said portion of facining the wind is equipped with the water conservancy diversion convexity.
5. a kind of louvered fin as claimed in claim 1 is characterized in that: said water conservancy diversion is protruding to be formed in one with said substrate.
6. a kind of louvered fin as claimed in claim 1 is characterized in that: the height that said water conservancy diversion convexity exceeds substrate plane is H1, and the height that said window wing exceeds substrate plane is H2, H1 >=H2.
7. a kind of louvered fin as claimed in claim 1 is characterized in that: the distance between said water conservancy diversion convex center and the nearest window center is L, and L satisfies 0.5mm≤L≤2.0mm.
8. a kind of louvered fin as claimed in claim 1 is characterized in that: said water conservancy diversion is protruding to be circular arc, V-arrangement or trapezoidal.
9. heat exchanger, it is characterized in that: said heat exchanger comprises each described louvered fin of claim 1 to 8.
10. a kind of heat exchanger as claimed in claim 9 is characterized in that: said heat exchanger is a micro-channel heat exchanger.
CN201210223874.4A 2012-06-29 2012-06-29 Louver fin and heat exchanger adopting louver fins Active CN102767982B (en)

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CN102767982B CN102767982B (en) 2014-08-20

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104110985A (en) * 2013-04-22 2014-10-22 浙江盾安热工科技有限公司 Fin structure and heat exchanger
CN104567108A (en) * 2013-10-12 2015-04-29 杭州三花微通道换热器有限公司 Heat exchanger and fin thereof
CN104995476A (en) * 2013-02-18 2015-10-21 株式会社电装 Heat exchanger and production method therefor
CN111928712A (en) * 2020-07-20 2020-11-13 珠海格力电器股份有限公司 Fin and heat exchanger

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Publication number Priority date Publication date Assignee Title
GB2125529A (en) * 1982-08-18 1984-03-07 Serck Industries Ltd Heat transfer fin for a heat exchanger
US20020189799A1 (en) * 2001-06-13 2002-12-19 Tatsuo Ozaki Heat exchanger
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JP3942210B2 (en) * 1996-04-16 2007-07-11 昭和電工株式会社 Heat exchanger, room air conditioner and car air conditioner using this heat exchanger
CN101074855A (en) * 2007-06-28 2007-11-21 上海交通大学 Enhanced heat-conductive louver sheets
CN101573581A (en) * 2007-01-12 2009-11-04 普罗里昂斯国际公司 Heat exchanger fin
CN102478369A (en) * 2010-11-29 2012-05-30 沈阳通世达冷却系统有限公司 Heat sink core fin

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125529A (en) * 1982-08-18 1984-03-07 Serck Industries Ltd Heat transfer fin for a heat exchanger
JP3942210B2 (en) * 1996-04-16 2007-07-11 昭和電工株式会社 Heat exchanger, room air conditioner and car air conditioner using this heat exchanger
US20020189799A1 (en) * 2001-06-13 2002-12-19 Tatsuo Ozaki Heat exchanger
US20070023171A1 (en) * 2005-07-29 2007-02-01 Valeo, Inc. Heat exchanger with separators and improved strength
CN101573581A (en) * 2007-01-12 2009-11-04 普罗里昂斯国际公司 Heat exchanger fin
CN101074855A (en) * 2007-06-28 2007-11-21 上海交通大学 Enhanced heat-conductive louver sheets
CN102478369A (en) * 2010-11-29 2012-05-30 沈阳通世达冷却系统有限公司 Heat sink core fin

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104995476A (en) * 2013-02-18 2015-10-21 株式会社电装 Heat exchanger and production method therefor
CN104995476B (en) * 2013-02-18 2016-12-21 株式会社电装 Heat exchanger and manufacture method thereof
CN104110985A (en) * 2013-04-22 2014-10-22 浙江盾安热工科技有限公司 Fin structure and heat exchanger
CN104567108A (en) * 2013-10-12 2015-04-29 杭州三花微通道换热器有限公司 Heat exchanger and fin thereof
CN104567108B (en) * 2013-10-12 2018-12-11 杭州三花微通道换热器有限公司 A kind of heat exchanger and its fin
CN111928712A (en) * 2020-07-20 2020-11-13 珠海格力电器股份有限公司 Fin and heat exchanger
CN111928712B (en) * 2020-07-20 2021-10-22 珠海格力电器股份有限公司 Fin and heat exchanger

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Effective date of registration: 20190521

Address after: 519055 No.16 Workshop, East Shengping Avenue, Pingsha Town, Zhuhai City, Guangdong Province

Patentee after: Zhuhai Dun'an Thermal Engineering Technology Co., Ltd.

Address before: 311835 Diankou Industrial Zone, Zhuji City, Shaoxing City, Zhejiang Province

Patentee before: Zhejiang Dunan Artificial Environment Co., Ltd.

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