CN213631743U - Multichannel parallel flow heat exchange aluminum flat tube for air conditioner - Google Patents
Multichannel parallel flow heat exchange aluminum flat tube for air conditioner Download PDFInfo
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- CN213631743U CN213631743U CN202022103671.4U CN202022103671U CN213631743U CN 213631743 U CN213631743 U CN 213631743U CN 202022103671 U CN202022103671 U CN 202022103671U CN 213631743 U CN213631743 U CN 213631743U
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Abstract
The utility model discloses an idle call multichannel parallel flow heat transfer aluminum flat tube, the cross-section of aluminum flat tube body along width direction is long circle, sets up first class through-hole and second through-hole inside the aluminum flat tube body, and first class through-hole respectively sets up one along the both sides of aluminum flat tube body width direction, and the second through-hole sets up between two first class through-holes, sets up first wall between first class through-hole and the second through-hole; the section of the first flow through hole is a combination of a semicircle and a first rectangle, and the semicircle is concentric with the side arc of the aluminum flat tube body in the width direction; the cross section of the second flow through hole is in a second rectangle, the upper side and the lower side of the second rectangle are respectively provided with a second notch, and the second notches are in a triangle shape. The utility model has the advantages that the triangular gap is arranged in the first flow through hole and/or the second flow through hole, so that the surface area of the inner wall of the through hole is increased compared with that of the rectangular through hole, and the heat exchange efficiency is improved; the yield is high, satisfies the user demand.
Description
Technical Field
The utility model belongs to the technical field of heat transfer aluminum flat tube, especially, relate to an idle call multichannel parallel flow heat transfer aluminum flat tube.
Background
The micro-channel aluminum flat tube is a thin-wall porous flat tubular material which is subjected to surface zinc spraying and corrosion prevention treatment by adopting a refined aluminum bar and hot extrusion, is mainly applied to an air conditioning system as a pipeline part bearing a novel environment-friendly refrigerant, and is internally provided with a channel for circulating the refrigerant so as to enable the refrigerant to circulate in the air conditioning system or a heat exchange device, thereby playing a role in heat exchange. The micro-channel aluminum flat tube is an important component which directly influences the effect of the air-conditioning heat exchanger. Because the micro-channel aluminum flat tube product has high technical content and extremely high production difficulty, only a few manufacturers produce the micro-channel aluminum flat tube product before 2010, the production technology is basically monopolized by the micro-channel aluminum flat tube product, domestic automobile air-conditioning heat exchanger manufacturers have no capacity to produce the micro-channel aluminum flat tube product, and the micro-channel aluminum flat tube product is only obtained from foreign manufacturers which master the production technology of the micro-channel aluminum flat tube product and are arranged in a domestic exclusive subsidiary company or directly imported. In recent years, domestic enterprises are continuously and deeply researching and developing the micro-channel aluminum flat tubes, a large number of domestic micro-channel aluminum flat tubes are put on the market, and the cross-sectional structures of a plurality of micro-channel aluminum flat tubes are known to the public and technical staff through patent documents.
If, chinese patent application, application number cn201520242630.x, application date 2015.04.21, grant notice number CN204666006U, grant notice date 2015.09.23, disclose heterotypic aluminum flat tube structure, including the flat aluminum tube body, the middle part of flat aluminum tube body is provided with the baffle, the baffle falls into upper half and the latter half with flat aluminum tube body is inside, is located upper half and the latter half and all is provided with a plurality of passageways of parallel spaced, and each passageway is from left to right structure in proper order: the structure comprises an oval structure, a pentagonal structure, an isosceles triangular structure, an isosceles trapezoid structure, a crossed structure, a rectangular structure and a circular structure, wherein a plurality of arc structures are arranged on the upper wall surface and the lower wall surface of the rectangular structure; the channels in the upper half correspond to the channels in the lower half.
If again, chinese patent application, application number CN201520242619.3, application date 2015.04.21, publication number CN204666005U, publication number 2015.09.23 disclose that the concurrent flow spouts zinc aluminum flat tube, including the flat aluminum tube body, the circular structure of cross-section growth of flat aluminum tube body, the inside of flat aluminum tube body is provided with thirteen parallel spaced passageways, the inside internal spline structure that becomes of passageway is provided with eight internal spline teeth on the inner circumferential surface of single passageway.
For another example, chinese patent application No. CN201220636609.4, application date 2012.11.28, grant No. CN202947516U, grant No. 2013.05.22, discloses a multi-channel aluminum flat tube for air conditioner, wherein two ends of a double-sided composite aluminum alloy plate are bent inward to form sine waves, and the cross sections of the channels formed in the aluminum flat tube body are arranged in a multi-channel manner continuously in sine waves, so that the refrigerant can flow freely therein, and high-efficiency heat exchange is achieved. The outer surface of the flat aluminum tube body is coated with a zinc layer. The utility model is used for the air conditioner trade.
According to the technical scheme, the channels for the circulation of the refrigerant are arranged in the micro-channel aluminum flat tubes, so that the refrigerant circulates in an air conditioning system or a heat exchange device, and the heat exchange effect is achieved. Beneficial attempts are made to improve the heat exchange efficiency of the micro-channel aluminum flat tube from the angle of increasing the heat exchange area. However, in the environment with higher and higher requirements for the performance and the service life of air-conditioning products, the requirements of the air-conditioning products are met, the sectional shapes of the products are required, and the material yield of the micro-channel aluminum flat tube is also considered comprehensively.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
Because the restriction of extrusion technology, raw and other materials, each size microchannel aluminum flat tube product under arbitrary cross sectional shape can not both the design production, and it is high to deposit just rejection rate, and manufacturing cost is high, and the finished product can't satisfy special environment's harsh operation requirement scheduling problem, the utility model aims to provide an idle call multichannel parallel flow heat transfer aluminum flat tube optimizes microchannel aluminum flat tube cross sectional shape design, cooperates current extrusion technology condition, improves the lumber recovery, reduces the rejection rate, reduction in production cost, and furthest satisfies special environment's harsh operation requirement, has certain market competition.
2. Technical scheme
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a multichannel parallel flow heat exchange aluminum flat tube for an air conditioner comprises an aluminum flat tube body and a zinc spraying coating, wherein the section of the aluminum flat tube body in the width direction is in an oblong shape, the zinc spraying coating is arranged on the outer surface of the aluminum flat tube body, and a plurality of circulation holes are formed in the aluminum flat tube body; the section of the first flow through hole is a combination of a semicircle and a first rectangle, the diameter edge of the semicircle is connected with one edge of the first rectangle, and the semicircle is concentric with the side arc of the aluminum flat tube body in the width direction; the cross section of the second flow through hole is in a second rectangle, the upper side and the lower side of the second rectangle are respectively provided with a second notch, and the second notches are in a triangle shape.
In a specific embodiment of the present invention, the upper second notch and the lower second notch of the second rectangle are symmetrically arranged along the width direction of the aluminum flat tube; and the rectangular corners of the first flow through hole and the second flow through hole are in rounded corner transition.
In a specific embodiment of the present invention, when the number of the second through holes is more than one, a second partition is disposed between two adjacent second through holes.
In a specific embodiment of the present invention, the zinc spraying amount of the zinc spraying coating is 10 +/-2 g/m2。
In a specific embodiment of the utility model, the tensile strength of idle call multichannel concurrent flow heat transfer aluminum flat tube is more than or equal to 75MPa, and yield strength is more than or equal to 20MPa, and the percentage elongation is more than or equal to 25%.
In a specific embodiment of the present invention, the height of the cross section of the flat aluminum tube body along the width direction is 2 ± 0.03mm, the width is 16 ± 0.03mm, and the weight of the parallel flow heat exchange flat aluminum tube is 43 ± 0.4 g/m; the distance between the upper edges of the first flow through holes and the second flow through holes and the upper surface of the aluminum flat tube body is 0.3 +/-0.05 mm, and the distance between the lower edges of the first flow through holes and the second flow through holes and the lower surface of the aluminum flat tube body is 0.3 +/-0.05 mm; the width of the first partition is 0.28 +/-0.05 mm; the second partition is equal to the first partition in width; the thickness of the side arc and the semicircle of the aluminum flat tube body is 0.4 +/-0.05 mm; the number of the second through holes is 8.
In a specific embodiment of the present invention, the open side of the second notch is a triangle base, the length of the triangle base is 0.7mm, and the height of the triangle is 0.3 mm.
In a specific embodiment of the present invention, a first notch is respectively disposed on the upper and lower sides of the first rectangle, and the first notch is triangular; the first breach in the higher authority of first rectangle sets up along aluminum flat tube width direction symmetry with lower first breach.
In a specific embodiment of the present invention, the open side of the first notch is a triangle base, the length of the triangle base is 0.2 ± 0.05mm, and the height of the triangle is 0.2 ± 0.1 mm; the opening side of the second notch is a triangle bottom side, the length of the triangle bottom side is 0.2 +/-0.05 mm, and the height of the triangle is 0.2 +/-0.1 mm.
In a specific embodiment of the present invention, the height of the cross section of the flat aluminum tube body along the width direction is 2 ± 0.02mm, the width is 25 ± 0.04mm, and the weight of the parallel flow heat exchange flat aluminum tube is 67 ± 0.3 g/m; the distance between the upper edges of the first flow through holes and the second flow through holes and the upper surface of the aluminum flat tube body is 0.3 +/-0.05 mm, and the distance between the lower edges of the first flow through holes and the second flow through holes and the lower surface of the first flow through holes and the second flow through holes is 0.3 +/-0.05 mm; the width of the first partition is 0.3 +/-0.05 mm; the second partition is equal to the first partition in width; the radius of the side arc of the aluminum flat tube body is 0.9mm, and the radius of the semicircle is 0.7 mm; the number of the second through holes is 16.
Aiming at the utility model discloses an idle call multichannel parallel flow heat transfer aluminum flat tube designs extrusion die, install extrusion die in the extruder, obtain through extrusion to the concise aluminium bar, the surface spouts zinc anticorrosive treatment, cools off the utility model discloses an idle call multichannel parallel flow heat transfer aluminum flat tube, at straightening and cut to length it, finally obtain the microchannel aluminum flat tube who uses in air conditioning system, aluminum flat tube body surface does not have obvious flow mark, lump, gas pocket, slag inclusion, crack defect, the internal surface does not have scotch, indentation defect; the notch has no burr, and the inner part and the outer part of the aluminum flat tube are clean and have no burr.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that: the outer surface of the aluminum flat tube body is provided with the sprayed zinc layer, so that the corrosion resistance of the aluminum flat tube can be effectively improved, and the service life of the aluminum flat tube is prolonged; triangular gaps are arranged in the first flow through hole and the second flow through hole, so that the surface area of the inner wall of each through hole is increased compared with that of a rectangular through hole, the contact area of each unit through hole is increased, the contact efficiency of a refrigerant is improved, and the heat exchange efficiency of the refrigerant is also improved; each structure to the aluminum flat tube body has carried out the injecing of size, and is rational in infrastructure, can not lead to the waste of material because of the size is too big, and the lumber recovery is high, reduces manufacturing cost, satisfies the user demand.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the utility model discloses embodiment 1 is along aluminum flat tube body width direction's cross-sectional schematic.
Fig. 2 is the utility model discloses embodiment 2 is along aluminum flat tube body width direction's cross-sectional schematic diagram
In the figure: 1-aluminum flat tube body 2-second flow through hole 3-first partition 4-semicircle 5-first rectangle 6-side arc 7-second gap 8-fillet 9-second partition 10-upper surface 11-lower surface 12-first gap.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the utility model.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be interpreted broadly, e.g. as a fixed connection, a detachable connection or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the utility model can be understood in specific cases to those of ordinary skill in the art.
Example 1
A multi-channel parallel flow heat exchange aluminum flat tube for an air conditioner comprises an aluminum flat tube body 1 and a zinc spraying coating (not marked in the drawing), wherein the section of the aluminum flat tube body 1 along the width direction is in an oblong shape, the zinc spraying coating is arranged on the outer surface of the aluminum flat tube body 1, a plurality of circulation holes are formed in the aluminum flat tube body 1, the multi-channel parallel flow heat exchange aluminum flat tube is characterized in that the plurality of circulation holes comprise a first circulation hole and a second circulation hole 2, the first circulation hole is respectively arranged on two sides of the aluminum flat tube body 1 along the width direction, the second circulation hole 2 is arranged between the two first circulation holes, a first partition 3 is arranged between the first circulation hole and the second circulation hole 2, and the number of the; the section of the first flow through hole is a combination of a semicircle 4 and a first rectangle 5, the diameter side of the semicircle 4 is connected with one side of the first rectangle 5, and the semicircle 4 is concentric with the side arc 6 of the aluminum flat tube body 1 in the width direction; the cross section of the second flow through hole 2 is a second rectangle, the upper side and the lower side of the second rectangle are respectively provided with a second notch 7, and the second notches 7 are triangular.
The upper second notch 7 and the lower second notch 7 of the second rectangle are symmetrically arranged along the width direction of the aluminum flat tube; the rectangular corners of the first and second flow holes 2 are transited by using round corners 8.
When the number of the second through holes 2 is more than one, a second partition 9 is arranged between two adjacent second through holes 2; 8 second flow holes 2 are provided
The zinc spraying amount of the zinc spraying coating is 10 +/-2 g/m2。
The tensile strength of the multi-channel parallel flow heat exchange aluminum flat tube for the air conditioner is more than or equal to 75MPa, the yield strength is more than or equal to 20MPa, and the elongation is more than or equal to 25%.
The height of the section of the aluminum flat tube body 1 along the width direction is 2 +/-0.03 mm, the width is 16 +/-0.03 mm, and the weight of the parallel flow heat exchange aluminum flat tube is 43 +/-0.4 g/m; the distance between the upper edges of the first flow through holes and the second flow through holes 2 and the upper surface 10 of the aluminum flat tube body 1 is 0.3 +/-0.05 mm, and the distance between the lower edges of the first flow through holes and the second flow through holes 2 and the lower surface 11 of the aluminum flat tube body 1 is 0.3 +/-0.05 mm; the width of the first partition 3 is 0.28 +/-0.05 mm; the second partition 9 is equal to the first partition 3 in width; the thickness of the side arc 6 of the aluminum flat tube body 1 and the semicircle 4 is 0.4 +/-0.05 mm.
The opening side of the second notch 7 is a triangle bottom side, the length of the triangle bottom side is 0.7mm, and the height of the triangle is 0.3 mm.
Example 2
A multi-channel parallel flow heat exchange aluminum flat tube for an air conditioner comprises an aluminum flat tube body 1 and a zinc spraying coating (not marked in the drawing), wherein the section of the aluminum flat tube body 1 along the width direction is in an oblong shape, the zinc spraying coating is arranged on the outer surface of the aluminum flat tube body 1, a plurality of circulation holes are formed in the aluminum flat tube body 1, the multi-channel parallel flow heat exchange aluminum flat tube is characterized in that the plurality of circulation holes comprise a first circulation hole and a second circulation hole 2, the first circulation hole is respectively arranged on two sides of the aluminum flat tube body 1 along the width direction, the second circulation hole 2 is arranged between the two first circulation holes, a first partition 3 is arranged between the first circulation hole and the second circulation hole 2, and the number of the; the section of the first flow through hole is a combination of a semicircle 4 and a first rectangle 5, the diameter side of the semicircle 4 is connected with one side of the first rectangle 5, and the semicircle 4 is concentric with the side arc 6 of the aluminum flat tube body 1 in the width direction; the cross section of the second flow through hole 2 is a second rectangle, the upper side and the lower side of the second rectangle are respectively provided with a second notch 7, and the second notches 7 are triangular.
The upper second notch 7 and the lower second notch 7 of the second rectangle are symmetrically arranged along the width direction of the aluminum flat tube; the rectangular corners of the first and second flow holes 2 are transited by using round corners 8.
When the number of the second through holes 2 is more than one, a second partition 9 is arranged between two adjacent second through holes 2; 16 second flow through holes 2 are provided
The zinc spraying amount of the zinc spraying coating is 10 +/-2 g/m2。
The tensile strength of the multi-channel parallel flow heat exchange aluminum flat tube for the air conditioner is more than or equal to 75MPa, the yield strength is more than or equal to 20MPa, and the elongation is more than or equal to 25%.
The upper side and the lower side of the first rectangle 5 are respectively provided with a first gap 12, and the first gaps 12 are triangular; the first breach 12 of the upper side of first rectangle 5 sets up along aluminum flat tube width direction symmetry with first breach 12 of lower side.
The opening side of the first notch 12 is a triangle bottom side, the length of the triangle bottom side is 0.2 +/-0.05 mm, and the height of the triangle is 0.2 +/-0.1 mm; the opening side of the second gap 7 is a triangle bottom side, the length of the triangle bottom side is 0.2 +/-0.05 mm, and the height of the triangle is 0.2 +/-0.1 mm.
The height of the section of the aluminum flat tube body 1 along the width direction is 2 +/-0.02 mm, the width is 25 +/-0.04 mm, and the weight of the parallel flow heat exchange aluminum flat tube is 67 +/-0.3 g/m; the distance between the upper edges of the first flow through holes and the second flow through holes 2 and the upper surface 10 of the aluminum flat tube body 1 is 0.3 +/-0.05 mm, and the distance between the lower edges of the first flow through holes and the second flow through holes 2 and the lower surface 11 is 0.3 +/-0.05 mm; the width of the first partition 3 is 0.3 +/-0.05 mm; the second partition 9 is equal to the first partition 3 in width; the radius of the side arc 6 of the aluminum flat tube body 1 is 0.9mm, and the radius of the semicircle 4 is 0.7 mm.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides an idle call multichannel concurrent flow heat transfer aluminum flat tube, includes the flat aluminum tube body and spouts the zinc coating, the flat aluminum tube body is the long circle along width direction's cross-section, spout the zinc coating setting at the surface of flat aluminum tube body, the inside a plurality of circulation holes that set up of flat aluminum tube body, its characterized in that: the plurality of circulation holes comprise first circulation holes and second circulation holes, the first circulation holes are respectively arranged on two sides of the aluminum flat tube body in the width direction, the second circulation holes are arranged between the two first circulation holes, a first partition is arranged between the first circulation holes and the second circulation holes, and the number of the second circulation holes is at least one; the section of the first flow through hole is a combination of a semicircle and a first rectangle, the diameter edge of the semicircle is connected with one edge of the first rectangle, and the semicircle is concentric with the side arc of the aluminum flat tube body in the width direction; the cross section of the second flow through hole is in a second rectangle, the upper side and the lower side of the second rectangle are respectively provided with a second notch, and the second notches are in a triangle shape.
2. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 1, wherein: the upper second notch and the lower second notch of the second rectangle are symmetrically arranged along the width direction of the aluminum flat tube; and the rectangular corners of the first flow through hole and the second flow through hole are in rounded corner transition.
3. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 2, wherein: when the number of the second through holes is more than one, a second partition is arranged between two adjacent second through holes.
4. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 1 or 2, wherein: the zinc spraying amount of the zinc spraying coating is 10 +/-2 g/m2。
5. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 1 or 2, wherein: the tensile strength of the multi-channel parallel flow heat exchange aluminum flat tube for the air conditioner is more than or equal to 75MPa, the yield strength is more than or equal to 20MPa, and the elongation is more than or equal to 25%.
6. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 3, wherein: the height of the section of the aluminum flat tube body along the width direction is 2 +/-0.03 mm, the width of the aluminum flat tube body is 16 +/-0.03 mm, and the weight of the parallel flow heat exchange aluminum flat tube is 43 +/-0.4 g/m; the distance between the upper edges of the first flow through holes and the second flow through holes and the upper surface of the aluminum flat tube body is 0.3 +/-0.05 mm, and the distance between the lower edges of the first flow through holes and the second flow through holes and the lower surface of the aluminum flat tube body is 0.3 +/-0.05 mm; the width of the first partition is 0.28 +/-0.05 mm; the second partition is equal to the first partition in width; the thickness of the side arc and the semicircle of the aluminum flat tube body is 0.4 +/-0.05 mm; the number of the second through holes is 8.
7. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 6, wherein: the opening side of the second notch is a triangle bottom side, the length of the triangle bottom side is 0.7mm, and the height of the triangle is 0.3 mm.
8. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 3, wherein: the upper side and the lower side of the first rectangle are respectively provided with a first notch, and the first notches are triangular; the first breach in the higher authority of first rectangle sets up along aluminum flat tube width direction symmetry with lower first breach.
9. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 8, wherein: the opening side of the first notch is a triangle bottom side, the length of the triangle bottom side is 0.2 +/-0.05 mm, and the height of the triangle is 0.2 +/-0.1 mm; the opening side of the second notch is a triangle bottom side, the length of the triangle bottom side is 0.2 +/-0.05 mm, and the height of the triangle is 0.2 +/-0.1 mm.
10. The multichannel parallel flow heat exchange aluminum flat tube for the air conditioner as claimed in claim 8, wherein: the height of the section of the aluminum flat tube body along the width direction is 2 +/-0.02 mm, the width is 25 +/-0.04 mm, and the weight of the parallel flow heat exchange aluminum flat tube is 67 +/-0.3 g/m; the distance between the upper edges of the first flow through holes and the second flow through holes and the upper surface of the aluminum flat tube body is 0.3 +/-0.05 mm, and the distance between the lower edges of the first flow through holes and the second flow through holes and the lower surface of the first flow through holes and the second flow through holes is 0.3 +/-0.05 mm; the width of the first partition is 0.3 +/-0.05 mm; the second partition is equal to the first partition in width; the radius of the side arc of the aluminum flat tube body is 0.9mm, and the radius of the semicircle is 0.7 mm; the number of the second through holes is 16.
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| CN202022103671.4U CN213631743U (en) | 2020-09-23 | 2020-09-23 | Multichannel parallel flow heat exchange aluminum flat tube for air conditioner |
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| CN202022103671.4U CN213631743U (en) | 2020-09-23 | 2020-09-23 | Multichannel parallel flow heat exchange aluminum flat tube for air conditioner |
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