CN102829576B - Microchannel heat exchanger - Google Patents
Microchannel heat exchanger Download PDFInfo
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- CN102829576B CN102829576B CN201210270116.8A CN201210270116A CN102829576B CN 102829576 B CN102829576 B CN 102829576B CN 201210270116 A CN201210270116 A CN 201210270116A CN 102829576 B CN102829576 B CN 102829576B
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Abstract
The invention discloses a microchannel heat exchanger which solves the problem that fins are caused to deform when an existing heat exchanger is bended along longitudinal direction of collecting tubes. The microchannel heat exchanger comprises the collecting tubes, flat tubes and fins, wherein the flat tubes are connected on the collecting tubes, and each fin is mounted between every two adjacent flat tubes. The microchannel heat exchanger is provided with at least one bending area in the longitudinal direction of the collecting tubes, each bending area includes at least one row of fins, at least one row of fins in the bending area are connected with at least one of adjacent flat tubes via a first connection part, and the first connection part can be stretched during bending of the microchannel heat exchanger. The above structure can be applied to various heat exchangers and microchannel heat exchangers in household/commercial air conditioning fields.
Description
Technical field
The present invention relates to a kind of heat exchanger, especially a kind of micro-channel heat exchanger.
Background technology
Micro-channel heat exchanger has lightweight, compact conformation, the advantage that heat exchange efficiency is high, instead of copper material and tool cost advantage; Meanwhile, the feature that its internal capacity is little, is conducive to greatly reduce refrigerant charge, meets the trend of energy-conserving and environment-protective, is widely used in family expenses/business air conditioner field.
In actual applications, because particular design requires or installing space restriction, micro-channel heat exchanger often needs bending certain angle, matches with specific bulk.Most micro-channel heat exchangers are to carry out bending and form the structure with appointment radian along header length direction.In traditional micro-channel heat exchanger Forging Process, the fin of bending inner side is extruded, and there will be down the distortion such as wing, distortion, hinders circulation of air; The fin in bending outside is stretched, and produces stretcher strain, even the situation such as is torn, and has a strong impact on heat exchanger outward appearance, simultaneously because fin is torn, also causes heat exchanger performance to reduce.
Existing above-mentioned technical problem when solving micro-channel heat exchanger bending, prior art is openly crossed following scheme:
In the patent documentation that publication number is " No.US20070227695A1 ", a kind of micro-channel heat exchanger is disclosed, this heat exchanger is placed a flat tube that does not insert header at bending part, and by the position reducing of the corresponding header of this flat tube, with this, reduce the distortion of bending part fin, when solving bending part fin problem on deformation, owing to having reduced the flat tube quantity of cold-producing medium circulation, the corresponding reduction of product heat exchange property.
In the patent documentation that publication number is " No.US20080202733A1 ", a kind of micro-channel heat exchanger is disclosed, the bending part of this heat exchanger has a clearance space, in this clearance space, place apparatus for bending and replaced original fin, therefore number of fins reduces, corresponding the reducing of heat transfer sheet area of product, reduction of heat exchange efficiency.
In the patent documentation that publication number is " CN101782337A ", a kind of micro-channel heat exchanger is disclosed, its scheme is by reducing the width of heat exchanger bending position fin, to solve the technical problem of bending part fin distortion, in like manner, the width of fin reduces, can make corresponding the reducing of heat transfer sheet area of product, reduction of heat exchange efficiency.
In the patent documentation that publication number is " CN101776402A ", a kind of micro-channel heat exchanger and fin thereof are disclosed, in this patent, the main paragraph of micro-channel heat exchanger fin is designed to curve-like, with this, overcome the harmful effect that fin bending inside portion divides compression, the stretcher strain of fin bending Outboard Sections to be produced, but this scheme is larger to the change of fin original structure, manufacturing process relative complex, causes cost to increase.
Therefore, how reducing heat exchanger along the bending difficulty of header direction, reduce the impact that bending heat exchanger performance is brought simultaneously, is the problem that those skilled in the art need to solve at present.
Summary of the invention
Object of the present invention is just to provide a kind of micro-channel heat exchanger, the fin problem on deformation that good solution heat exchanger causes along the bending of header length direction, and guarantee as far as possible heat exchanger performance and outward appearance.
For achieving the above object, the present invention adopts following technical scheme:
Scheme 1: a kind of micro-channel heat exchanger, comprise header, flat tube and fin, described flat tube is connected on described header, described fin is arranged between adjacent flat tube, described micro-channel heat exchanger has at least one bending region on the length direction of header, in each bending region, comprise at least one row fin, in fin in described bending region, have at least between a row fin and adjacent at least one flat tube and be connected by the first attaching parts, described the first attaching parts can be stretched in described micro-channel heat exchanger Forging Process.
The fin that connects flat tube by the first attaching parts, this fin comprises near the outer heat exchange fin in bending outside with near the interior heat exchange fin of bending inner side, described the first attaching parts are connected between outer heat exchange fin and adjacent at least one flat tube.
Described the first attaching parts are U-shaped connector or elastomer.
Between described interior heat exchange fin and adjacent at least one flat tube, by the second attaching parts, be connected, described the second attaching parts can be compressed in described micro-channel heat exchanger Forging Process.
Described the second attaching parts are U-shaped connector or elastomer.
Scheme 2: a kind of micro-channel heat exchanger, comprise header, flat tube and fin, described flat tube is connected on described header, described fin is arranged between adjacent flat tube, described micro-channel heat exchanger has at least one bending region on the length direction of header, in each bending region, comprise at least one row fin, in fin in described bending region, have at least a row fin to be formed by some row fins of arranging along header length direction, between adjacent sub-fin, by the first attaching parts, be connected, described the first attaching parts can be stretched in described micro-channel heat exchanger Forging Process.
Sub-fin comprises that described the first attaching parts are connected between the adjacent sub-fin of outer heat exchange near the sub-fin of interior heat exchange of the sub-fin of outer heat exchange in bending outside and close bending inner side.
Described the first attaching parts are U-shaped connector or elastomer.
Between the adjacent sub-fin of interior heat exchange, by the second attaching parts, be connected, described the second attaching parts can be compressed in described micro-channel heat exchanger Forging Process.
Described the second attaching parts are U-shaped connector or elastomer.
Beneficial effect of the present invention:
First, between the bending region inner fin of micro-channel heat exchanger of the present invention and adjacent flat tube, by the first attaching parts, be connected, the tensile force that the first attaching parts can be formed by bending outside in micro-channel heat exchanger Forging Process stretches, the first attaching parts have been born most of tensile force, thus avoided this position fin stretcher strain, the situation such as tear; Compared to existing technology, the present invention adopts after the first attaching parts, and the first attaching parts area occupied is negligible for whole fin, and fin structure does not produce larger change, the heat transfer sheet area of fin does not obviously reduce yet, thereby has guaranteed as far as possible heat exchanger performance and outward appearance.
Secondly, between the bending region inner fin of micro-channel heat exchanger of the present invention and adjacent flat tube, also by the second attaching parts, be connected, the compression stress that the second attaching parts can be formed by bending inner side in micro-channel heat exchanger Forging Process is compressed, the second attaching parts have been born most of compression stress, thereby avoided fin inside bending be extruded and occur down the distortion such as wing, distortion, guaranteed that fin original structure is not destroyed, guaranteed that to greatest extent the original heat exchange property of micro-channel heat exchanger is not lowered.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further explained:
Fig. 1 is the bending schematic diagram of existing micro-channel heat exchanger;
Fig. 2 is the structural representation of micro-channel heat exchanger embodiment mono-of the present invention;
Fig. 2 a is the scheme of installation one of the first attaching parts in embodiment mono-;
Fig. 2 b is the scheme of installation two of the first attaching parts in embodiment mono-:
Fig. 3 is the structural representation of micro-channel heat exchanger embodiment bis-of the present invention;
Fig. 4 is the structural representation of micro-channel heat exchanger embodiment tri-of the present invention;
Fig. 5 is the structural representation of micro-channel heat exchanger embodiment tetra-of the present invention;
Fig. 6 is the structural representation of micro-channel heat exchanger embodiment five of the present invention;
Fig. 7 is the mapped structure of micro-channel heat exchanger embodiment five of the present invention;
Fig. 8 is the structural representation of micro-channel heat exchanger embodiment six of the present invention.
The specific embodiment
Existing micro-channel heat exchanger has header, flat tube and fin, and because particular design requires or installing space restriction, micro-channel heat exchanger often needs bending certain angle, matches with specific bulk.With reference to Fig. 1, in Forging Process, fin 03 is stretched near the part 01 in bending outside, fin 03 is compressed near the part 02 of bending inner side, and the amount of tension in outside ecto-entad in radius bend direction dwindles gradually, and the decrement of inner side is also dwindled gradually from inside to outside in radius bend direction, approaching fin 03 center, amount of tension and decrement are close to zero.
In theory, fin can be offset compressed the dwindled area of fin part inside bending at bending Outboard Sections the launched area that is stretched, thereby, generally, the heat exchange property of heat exchanger can remain unchanged substantially, but actual installation circumstance complication is changeable, particularly, in the larger installing space of some bending angles, fin there will be the various drawbacks of mentioning in background technology.
The fin problem on deformation causing along the bending of header length direction for solving heat exchanger, and guarantee as far as possible heat exchanger performance and outward appearance.The invention provides a kind of micro-channel heat exchanger, comprise header, flat tube and fin, described flat tube is connected on described header, described fin is arranged between adjacent flat tube, described micro-channel heat exchanger has at least one bending region on the length direction of header, in each bending region, comprise at least one row fin, in fin in described bending region, have at least between a row fin and adjacent at least one flat tube and be connected by the first attaching parts, described the first attaching parts can be stretched in described micro-channel heat exchanger Forging Process.The tensile force that the first attaching parts can be formed by bending outside in micro-channel heat exchanger Forging Process stretch, and the first attaching parts have been born most of tensile force, thus avoided this position fin stretcher strain, the situation such as tear; Compared to existing technology, the present invention adopts after the first attaching parts, and the first attaching parts area occupied is negligible for whole fin, and fin structure does not produce larger change, the heat transfer sheet area of fin does not obviously reduce yet, thereby has guaranteed as far as possible heat exchanger performance and outward appearance.
Accompanying drawing below in conjunction with the embodiment of the present invention is explained and illustrated the technical scheme of the embodiment of the present invention, but following embodiment is only the preferred embodiments of the present invention, not all.Embodiment based in embodiment, those skilled in the art are other embodiment that obtains under the prerequisite of not making creative work, all belong to protection scope of the present invention.
Embodiment mono-:
With reference to Fig. 2, a kind of micro-channel heat exchanger, comprise header, flat tube 1 and fin 2, described flat tube 1 is connected on described header, and described fin 2 is arranged between adjacent flat tube 1, and header comprises header and lower header, upper header is parallel with lower header and be separated by a distance, flat tube 1 is distributed between header and lower header, and the cold-producing medium passing into is dispensed in each flat tube by header, flows into the cold-producing medium of flat tube and near air fin and carries out heat exchange.Micro-channel heat exchanger forms a bending region at the length direction B of header, and bending region can form a plurality of according to actual installation space certainly.In this bending region, include row fin 2 ＇, between this row fin 2 ＇ and an adjacent flat tube 1, by the first attaching parts 3, be connected, these first attaching parts 3 can be stretched in described micro-channel heat exchanger Forging Process.
Certainly, according to the bending angle of real exchanger, in bending region, can comprise two row, three row or multiple row fin more, but in these fins in bending region, have at least row to connect flat tubes 1 by the first attaching parts 3.
In general, the fin of heat exchanger mainly comprises a plurality of main paragraphs adjacent one another are 20 and the linkage section 21 that the end of adjacent body section 20 is connected, and linkage section 21 is generally welded on flat tube 1.The first above-mentioned attaching parts 3 are located between one of them linkage section 21 and corresponding flat tube 1.The mounting structure of the first attaching parts 3 can be divided into following two kinds of situations:
With reference to Fig. 2 a, on fin width direction A, the width of the first attaching parts 3 equates substantially with fin width, between the linkage section 21 that the first attaching parts 3 are arranged on fin main paragraph 20 right-hand members and corresponding flat tube 1, the linkage section 21 of fin main paragraph 20 left ends is welded to connect with corresponding flat tube 1, guaranteed fin installation strength, also reduced the suffered compression stress of fin part inside bending simultaneously, less to fin entire effect.
With reference to Fig. 2 b, on fin width direction A, the width of the first attaching parts 3 is less than the width of fin, and the first attaching parts 3 installation sites are near the bending outside of micro-channel heat exchanger.
Known according to the present embodiment scheme, the mounting structure of the first attaching parts 3 includes but not limited to above-mentioned two kinds.Can be that fin 2 ＇ are all connected by the first attaching parts 3 with two adjacent flat tubes 1.
In the present embodiment, the first attaching parts 3 adopt U connector, and U connector has two tabular connecting portions 31, the end of two connecting portions 31 is connected, a connecting portion connects fin, and another connecting portion connects flat tube 1, and connection can adopt the modes such as welding to realize; U connector can adopt aluminium, but is also not limited to aluminium, can be also the good material of ductility in this area.After bending, two connecting portion 31 separation of U connector, form V-arrangement, and the opening angle of U connector is suitable with the bending angle of micro-channel heat exchanger.The connecting portion of U connector is thinner, be arranged between fin and flat tube 1, U connector area occupied is negligible for whole fin, and fin structure does not produce larger change, the heat transfer sheet area of fin does not obviously reduce yet, thereby has guaranteed as far as possible heat exchanger performance and outward appearance.
The tensility of the first attaching parts 3 can also can realize by elastomer, and while adopting elastomer, in principle as long as guarantee that fin and elastomer are connected firmly, and elastomer needs high temperature resistant.
Embodiment bis-:
With reference to Fig. 3, in the present embodiment, fin 2 ＇ that connect flat tube 1 by the first attaching parts 3, this fin 2 ＇ adopt Split type structure, comprise near outer heat exchange fin 20 ＇ in bending outside and interior heat exchange fin 21 ＇ of close bending inner side, outer heat exchange fin 20 ＇ and interior heat exchange fin 21 ＇ are independently fin, the first attaching parts 3 are connected between outer heat exchange fin 20 ＇ and an adjacent flat tube 1, interior heat exchange fin 21 ＇ still adopt welding manner to be fixed on flat tube 1, be understood that outer heat exchange fin 20 ＇ mainly bear tensile force when micro-channel heat exchanger bending, compare interior heat exchange fin 21 ＇ compressed, the outer heat exchange fin 20 ＇ distortion that is stretched, it is large many that the impact that is even torn heat exchanger is wanted, generally, can preferentially solve the stretcher strain problem that outer heat exchange fin 20 ＇ produce when bending.
In the present embodiment, though fin 2 ＇ adopt Split type structure, but the summation of the width H2 of the width H1 of outer heat exchange fin 20 ＇ and outer heat exchange fin 20 ＇ equals the width of the common fin in both sides, bending region substantially, the first attaching parts 3 take up space and can ignore, therefore, the heat transfer sheet area of this fin does not obviously reduce, thereby has guaranteed as far as possible heat exchanger performance and outward appearance.
It will be appreciated by those skilled in the art that: for the division of outer heat exchange fin 20 ＇ and interior heat exchange fin 21 ＇, be that bending situation by micro-channel heat exchanger reality decides, not immobilize, therefore, H1=H2 or H1 > H2 or H1 < H2 all can implement
Embodiment tri-:
With reference to Fig. 4, for guaranteeing that the structure of fin integral body is not destroyed, retain to greatest extent the original heat exchange property of fin and outward appearance, the present embodiment is on the basis of embodiment bis-, between interior heat exchange fin 21 ＇ and an adjacent flat tube 1, the second attaching parts 4 are set, these second attaching parts 4 can be compressed in described micro-channel heat exchanger Forging Process.The compression stress that the second attaching parts 4 can be formed by bending inner side in micro-channel heat exchanger Forging Process is compressed, the second attaching parts 4 have been born most of compression stress, thereby avoided interior heat exchange fin 21 ＇ to be extruded and occurred down the distortion such as wing, distortion, guaranteed that fin original structure is not destroyed, guaranteed that to greatest extent the original heat exchange property of micro-channel heat exchanger is not lowered.
As can be known from Fig. 4: the same U connector that adopts of the second attaching parts 4, but different: the opening direction of the second attaching parts 4 is contrary with the first attaching parts 3, specifically: the opening of the first attaching parts 3 is towards bending outside, the opening of the second attaching parts 4 is towards bending inner side, and the second attaching parts 4 have certain aperture before heat exchanger bending, so that compressed in Forging Process, therefore, the height of interior heat exchange fin 21 ＇ will be slightly less than the height of outer heat exchange fin 20 ＇, but not obviously reduction of the heat exchange area of fin integral body on the whole.
The compressible performance of the second attaching parts 4 also can realize by elastomer, specifically with reference to embodiment mono-, no longer describes in detail.
Embodiment tetra-:
With reference to Fig. 5, a kind of micro-channel heat exchanger, comprise header, flat tube 1 and fin 2, described flat tube 1 is connected on described header, described fin is arranged between adjacent flat tube 1, described micro-channel heat exchanger has a bending region on the length direction of header, in this bending region, comprise a row fin, and this row fin is by sub-fin 22 ＇ of two row that arrange along header length direction B, 23 ＇ form, sub-fin 22 ＇ of two row, between 23 ＇, by the first attaching parts 3, be connected, these first attaching parts 3 can be stretched in described micro-channel heat exchanger Forging Process.
Certainly, according to the bending angle of real exchanger, in bending region, can comprise two row, three row or multiple row fin more, but in these fins in bending region, have at least a row fin to be formed by some row fins of arranging along header length direction B.
The width H3 of every row fin equals the width of the common fin in both sides, bending region substantially.After bending, the sub-fin of two row is just separated from each other with tensile force, but the overall heat transfer sheet area of fin obviously do not reduce, thereby has guaranteed as far as possible heat exchanger performance and outward appearance.
The first attaching parts 3 can be U-shaped connector or elastomer, and concrete structure can be with reference to above-mentioned arbitrary embodiment.
Embodiment five:
With reference to Fig. 6, the present embodiment is on the basis of embodiment tetra-: sub-fin adopts Split type structure, comprise near sub-fin 221 ＇ of outer heat exchange, 231 ＇ in bending outside and sub-fin 222 ＇ of interior heat exchange, 232 ＇ of close bending inner side, the first attaching parts 3 are connected between the outer sub-fin of heat exchange of two row, and sub-fin 222 ＇ of interior heat exchange, 232 ＇ still adopt welding manner to be fixed on flat tube 1.
As can be known from Fig. 6: the sub-fin of two row is divided into the independently sub-fin of outer heat exchange and the sub-fin of interior heat exchange, the first attaching parts 3 are connected between the outer sub-fin of heat exchange of two row.
But the simple transformation as the present embodiment: with reference to Fig. 7, sub-fin 221 ＇ of the two outer heat exchange of row, 231 ＇ connect by the first attaching parts 3, and two sub-fin 222 ＇ of interior heat exchange, 232 ＇ synthesize an independently fin, during bending, be not subject to the impact of the first attaching parts 3.
Embodiment six:
With reference to Fig. 8, for guaranteeing that the structure of fin integral body is not destroyed, retain to greatest extent the original heat exchange property of fin and outward appearance, the present embodiment is on the basis of embodiment five: between two sub-fin 222 ＇ of interior heat exchange, 232 ＇, by the second attaching parts 4, be connected, described the second attaching parts 4 can be compressed in described micro-channel heat exchanger Forging Process.The compression stress that the second attaching parts 4 can be formed by bending inner side in micro-channel heat exchanger Forging Process is compressed, the second attaching parts 4 have been born most of compression stress, thereby avoided the sub-fin of interior heat exchange to be extruded and occurred down the distortion such as wing, distortion, guaranteed that fin original structure is not destroyed, guaranteed that to greatest extent the original heat exchange property of micro-channel heat exchanger is not lowered.
The structure of the second attaching parts 4 can, with reference to embodiment tri-, no longer describe in detail.
By explanation and the explanation of above-described embodiment; be understood that: the present invention is intended to solve the fin problem on deformation that heat exchanger causes along the bending of header length direction; and guarantee that as far as possible heat exchanger performance and outward appearance are not destroyed; for this reason; above-described embodiment, just for explaining and explanation, is not of the present invention whole, the embodiment based in embodiment; those skilled in the art are other embodiment that obtains under the prerequisite of not making creative work, all belong to protection scope of the present invention.
The embodiment of the present invention is mainly used in the heat exchanger, micro-channel heat exchanger in various family expenses/business air conditioners field etc.
By above-described embodiment, object of the present invention is by fully effective 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 accompanying drawing and describe in the specific embodiment above.Any modification that does not depart from function and structure principle of the present invention all will be included in the scope of claims.
Claims (10)
1. a micro-channel heat exchanger, comprise header, flat tube and fin, described flat tube is connected on described header, described fin is arranged between adjacent flat tube, described micro-channel heat exchanger has at least one bending region on the length direction of header, in each bending region, comprise at least one row fin, it is characterized in that: in the fin in described bending region, have at least between a row fin and adjacent at least one flat tube and be connected by the first attaching parts, described the first attaching parts can be stretched in described micro-channel heat exchanger Forging Process.
2. a kind of micro-channel heat exchanger as claimed in claim 1, it is characterized in that: the fin that connects flat tube by the first attaching parts comprises near the outer heat exchange fin in bending outside with near the interior heat exchange fin of bending inner side, described the first attaching parts are connected between outer heat exchange fin and adjacent at least one flat tube.
3. a kind of micro-channel heat exchanger as claimed in claim 1, is characterized in that: described the first attaching parts are U-shaped connector or elastomer.
4. a kind of micro-channel heat exchanger as claimed in claim 2, it is characterized in that: between described interior heat exchange fin and adjacent at least one flat tube, by the second attaching parts, be connected, described the second attaching parts can be compressed in described micro-channel heat exchanger Forging Process.
5. a kind of micro-channel heat exchanger as claimed in claim 4, is characterized in that: described the second attaching parts are U-shaped connector or elastomer.
6. a micro-channel heat exchanger, comprise header, flat tube and fin, described flat tube is connected on described header, described fin is arranged between adjacent flat tube, described micro-channel heat exchanger has at least one bending region on the length direction of header, in each bending region, comprise at least one row fin, it is characterized in that: in the fin in described bending region, have at least a row fin to be formed by some row fins of arranging along header length direction, between adjacent sub-fin, by the first attaching parts, be connected, described the first attaching parts can be stretched in described micro-channel heat exchanger Forging Process.
7. a kind of micro-channel heat exchanger as claimed in claim 6, is characterized in that: sub-fin comprises that described the first attaching parts are connected between the adjacent sub-fin of outer heat exchange near the sub-fin of interior heat exchange of the sub-fin of outer heat exchange in bending outside and close bending inner side.
8. a kind of micro-channel heat exchanger as claimed in claim 6, is characterized in that: described the first attaching parts are U-shaped connector or elastomer.
9. a kind of micro-channel heat exchanger as claimed in claim 7, is characterized in that: between the adjacent sub-fin of interior heat exchange, by the second attaching parts, be connected, described the second attaching parts can be compressed in described micro-channel heat exchanger Forging Process.
10. a kind of micro-channel heat exchanger as claimed in claim 9, is characterized in that: described the second attaching parts are U-shaped connector or elastomer.
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| CN201210270116.8A CN102829576B (en) | 2012-08-01 | 2012-08-01 | Microchannel heat exchanger |
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| CN201210270116.8A CN102829576B (en) | 2012-08-01 | 2012-08-01 | Microchannel heat exchanger |
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| CN102829576B true CN102829576B (en) | 2014-01-22 |
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| CN108139178B (en) * | 2015-09-30 | 2019-12-06 | 三菱电机株式会社 | Heat exchanger and refrigeration cycle device provided with same |
| US20210063089A1 (en) | 2019-09-03 | 2021-03-04 | Mahle International Gmbh | Curved heat exchanger and method of manufacturing |
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| JP2000154992A (en) * | 1998-11-18 | 2000-06-06 | Daikin Ind Ltd | Air heat exchanger |
| CN101978237B (en) * | 2008-03-20 | 2014-03-05 | 开利公司 | Micro-channel heat exchanger suitable for bending |
| CN101782337A (en) * | 2009-01-20 | 2010-07-21 | 三花丹佛斯（杭州）微通道换热器有限公司 | Micro-channel heat exchanger |
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Owner name: ZHEJIANG DUNAN THERMAL TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT CO., LTD. Effective date: 20131112 |
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Effective date of registration: 20131112 Address after: 311835 Zhuji City, Zhejiang Province, the mouth of the mouth of the industrial zone of Zhejiang shield Thermal Technology Co., Ltd. Applicant after: Zhejiang DunAn Thermal Technology Co., Ltd. Address before: 311835 Zhejiang city in Shaoxing Province town of Zhuji city shop Industrial Zone Applicant before: Zhejiang Dunan Artificial Environment Co., Ltd. |
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