CN102878851A

CN102878851A - Micro-channel heat exchanger and foam metal fins thereof

Info

Publication number: CN102878851A
Application number: CN201210334596XA
Authority: CN
Inventors: 李敏霞; 刘忠彦; 马一太
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2012-09-11
Filing date: 2012-09-11
Publication date: 2013-01-16

Abstract

The invention discloses a micro-channel heat exchanger and foam metal fins thereof. The fins are made of foam metal; the fins comprise sleeves which can be arranged outside the flat tubes of the micro-channel heat exchanger; beads which are arranged at intervals are uniformly distributed on upper surfaces and lower surfaces of the sleeves respectively; the shapes of the beads can be one of triangular prisms of which the sections are isosceles triangles, triangular prisms of which the sections are analogous isosceles triangles and the waist lines are arcs, quadrangular prisms of which the sections are isosceles trapezoids, and quadrangular prisms of which the sections are analogous isosceles trapezoids and the waist lines are arcs. The foam metal is applied to the fins of the micro-channel heat exchanger; through the through holes inside the foam metal, flowing air can produce complex three-dimensional flow, the heat exchange area at an air side is increased, and exchange coefficient and unit heat exchange capacity of the fins are increased, so that heat exchange efficiency and comprehensive performance of the micro-channel heat exchanger are effectively improved.

Description

A kind of micro-channel heat exchanger and foam metal fin thereof

Technical field

The present invention relates to a kind of heat exchange or heat-transfer equipment and parts thereof, in particular, relate to increase heat exchange or heat-transfer equipment and the parts thereof of heat transfer area structure.

Background technology

Originally micro-channel heat exchanger is that application is more in electronic heating element and small size gas turbine, has now expanded to air conditioning for automobiles, central air-conditioning and domestic air conditioning field, and it has a extensive future.Micro-channel heat exchanger is applied to have following advantage in the air-conditioning: heat transfer efficiency is high; Can make the volume-diminished of air-conditioning, weight saving; Do not use copper material expensive, shortage of resources; Can reduce the filling quantity of cold-producing medium etc.

But the many aluminum sheet of fin of existing micro-channel heat exchanger, easily bending, and usually make blinds punching form with increase heat transfer outside a tube area, however it is always limited to increase pipe outside heat exchange area on the plane.Particularly for micro-channel heat exchanger, because its caliber is less, cause the long-pending fin area that can increase in tube outside very limited.

Therefore, how to improve the heat exchange property of micro-channel heat exchanger, become the focus of current micro-channel heat exchanger research.

Summary of the invention

The present invention will solve is the technical problem that the heat exchange property of existing micro-channel heat exchanger has much room for improvement, a kind of micro-channel heat exchanger and foam metal fin thereof are provided, by novel fin configuration, can improve heat exchange efficiency and the combination property of micro-channel heat exchanger.

In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:

A kind of foam metal fin, be used for micro-channel heat exchanger, it is characterized in that, described fin is made by foam metal, described fin comprises the sleeve pipe of the flat tube outside that can be installed on described micro-channel heat exchanger, described sleeve pipe upper surface and lower surface are evenly equipped with respectively the fin that the interval arranges, and it is that class isosceles triangle and its waist are that the tri-prismoid of camber line, four prisms cylinder, cross section that the cross section is isosceles trapezoid are that class isosceles trapezoid and its waist are wherein a kind of of four prisms cylinder of camber line that the shape of described fin is selected from tri-prismoid, cross section that the cross section is isosceles triangle.

Described foam metal is wherein a kind of of foam copper, foamed aluminium, foam iron or nickel foam.

The aperture of described foam metal is 0.05 ~ 4mm.

The described fin of described sleeve pipe upper surface and the described fin of lower surface are symmetry arrangement or staggered.

The thickness of described sleeve pipe is 0.5 ~ 2mm.

Described fin highest point surface is 3 ~ 10mm to the distance between the described flat tube outer surface.

Take the line of symmetry of described fin as benchmark, the spacing between the adjacent lugs is 0.5 ~ 10mm.

Take the intersecting lens of described fin and described sleeve pipe as benchmark, the spacing between the adjacent lugs is 0 ~ 5mm.

When described fin was four prisms cylinder, the width of described fin highest point was 0.5 ~ 5mm.

A kind of micro-channel heat exchanger comprises a plurality of flat tubes, and socket is equipped with above-mentioned foam metal fin on the described flat tube.

The invention has the beneficial effects as follows:

Foam metal is comprised of rigid backbone and interior bone hole, has excellent physical characteristic and good mechanical performance, and its proportion is little, be difficult for bending, specific area is large, the heat exchange heat-sinking capability is high.

The present invention is applied to foam metal the fin of micro-channel heat exchanger, the air that flows is by the via holes of foam metal inside, can produce complicated Three-dimensional Flow, temperature field and Flow Field Distribution that air is formed are more rational, increase the heat exchange area of air side, improve the coefficient of heat transfer and the unit exchange capability of heat of fin, thus Effective Raise micro-channel heat exchanger heat exchange efficiency and combination property.

The present invention becomes fin design the fin shape of different cross section form and interval to arrange simultaneously, mainly be in order further to increase the air side heat exchange area, increase is to the disturbance of air, and forms the circulation of air between adjacent heat exchange tubes, reduces air by the flow resistance of foam metal.

Description of drawings

Fig. 1 is the structural representation of the micro-channel heat exchanger of embodiment one provided by the present invention;

Fig. 2 is the top view of A direction among Fig. 1;

Fig. 3 is the B-B profile of Fig. 1;

Fig. 4 is the C-C profile of Fig. 1;

Fig. 5 is the D-D profile of Fig. 1;

The structural representation of the micro-channel heat exchanger of Fig. 6 embodiment two provided by the present invention;

Fig. 7 is the top view of A direction among Fig. 6;

Fig. 8 is the B-B profile of Fig. 6;

Fig. 9 is the C-C profile of Fig. 6;

Figure 10 is the structural representation of the micro-channel heat exchanger of embodiment three provided by the present invention;

Figure 11 is the top view of A direction among Figure 10;

Figure 12 is the B-B profile of Figure 10;

Figure 13 is the C-C profile of Figure 10;

Figure 14 is the structural representation of the micro-channel heat exchanger of embodiment four provided by the present invention;

Figure 15 is the top view of A direction among Figure 14;

Figure 16 is the B-B profile of Figure 14;

Figure 17 is the C-C profile of Figure 14.

Among the figure: 1, flat tube; 2, fin; 21, sleeve pipe; 22, fin; 3, liquid trap; 4, distributing pipe.

The specific embodiment

For further understanding summary of the invention of the present invention, characteristics and effect, hereby exemplify following examples, and cooperate accompanying drawing to be described in detail as follows:

Embodiment one

To shown in Figure 5, present embodiment has disclosed a kind of foam metal fin and has had the micro-channel heat exchanger of this fin such as Fig. 1, and micro-channel heat exchanger comprises liquid trap 3 and the distributing pipe 4 at two ends, and liquid trap 3 and distributing pipe 4 are that cylinder and bottom surface radius are 10 ~ 40mm.Be provided with a plurality of flat tubes 1 between liquid trap 3 and the distributing pipe 4, the width j=10 ~ 30mm of flat tube 1, height i=1 ~ 2mm, being shaped as of the hole on the flat tube 1 is square or circular.

Fin 2 provided by the invention comprises rectangle sleeve pipe 21, and the inner cavity size of sleeve pipe 21 and flat tube 1 are complementary, and can be socketed each flat tube 1 outside that is installed on micro-channel heat exchanger.The upper surface of sleeve pipe 21 and lower surface are respectively arranged with fin 22, and fin 22 evenly distributes and the interval arranges.The shape of fin 22 is that the cross section is the four prisms cylinder of isosceles trapezoid in the present embodiment, and fin 22 is in upper surface and the lower surface symmetry arrangement of sleeve pipe 21.

The parameters of basic dimensions of fin 2 is as follows in the present embodiment: the longitudinal thickness d=0.5 ~ 1mm of sleeve pipe 21, transverse gage g=0.5 ~ 2mm.The height of fin 22, namely on the four prisms cylinder top margin of isosceles trapezoid to flat tube 1 outer surface apart from e=3 ~ 10mm.The width of fin 22 highest points, i.e. the top margin length a=0.5 ~ 5mm of isosceles trapezoid on the four prisms cylinder; And the recessed width b=0.5 ~ 5mm of fin 2 upper and lower surfaces.Spacing between the adjacent lugs is c=0.5 ~ 10mm, and the line of symmetry of isosceles trapezoid is as benchmark on the four prisms cylinder.Beeline f=0.5 on the adjacent flat tube 1 between the fin 2 ~ 6mm.

Fin 2 materials are foam metal, and foam metal can be selected foam copper, foamed aluminium, foam iron and nickel foam etc.Foam metal is comprised of rigid backbone and interior bone hole, has excellent physical characteristic and good mechanical performance, and its proportion is little, be difficult for bending, specific area is large, the heat exchange heat-sinking capability is high.The aperture of foam metal is preferably 0.05 ~ 4mm among the present invention.Foam metal can supply circulation of air, and mobile air can produce complicated Three-dimensional Flow by the through hole of foam metal fin, has increased the heat exchange area of heat exchanger air side, but the heat exchange property of Effective Raise heat exchanger.

Embodiment two

To shown in Figure 9, present embodiment only is that from the different of embodiment one shape of fin 22 is that the cross section is the four prisms cylinder of isosceles trapezoid, and fin 22 is staggered at upper surface and the lower surface of sleeve pipe 21 such as Fig. 6.

In the present embodiment on the adjacent flat tube 1 between the fin 2 apart from f=h=0.5 ~ 6mm.

Embodiment three

To shown in Figure 13, present embodiment only is that from the different of embodiment one shape of fin 22 is that the cross section is that class isosceles trapezoid and its waist are the four prisms cylinder of concave arc line, and fin 22 is in upper surface and the lower surface symmetry arrangement of sleeve pipe 21 such as Figure 10.

The parameters of basic dimensions of fin 2 is with embodiment one in the present embodiment.

Embodiment four

To shown in Figure 17, present embodiment only is that from the different of embodiment one shape of fin 22 is that the cross section is that class isosceles trapezoid and its waist are the four prisms cylinder of concave arc line, and fin 22 is staggered at upper surface and the lower surface of sleeve pipe 21 such as Figure 14.

The parameters of basic dimensions of fin 2 is with embodiment two in the present embodiment.

Above-mentioned four embodiment just to the shape of fin 22 for example, the shape of fin 22 is various, specifically can select the cross section is the tri-prismoid of isosceles triangle; The cross section is that class isosceles triangle and its waist are the tri-prismoid of camber line, and its mean camber line can be the concave arc line, and namely the two sides of tri-prismoid are cancave cambered surface; Also can be the convex arc line, namely the two sides of tri-prismoid be convex globoidal; Can also select the cross section is the four prisms cylinder of isosceles trapezoid; The cross section is that class isosceles trapezoid and its waist are the four prisms cylinder of camber line, and its mean camber line can be the concave arc line, and namely the two sides of four prisms cylinder are cancave cambered surface; Also can be the convex arc line, namely the two sides of four prisms cylinder be convex globoidal.

Although the above is described the preferred embodiments of the present invention by reference to the accompanying drawings; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, these all belong within protection scope of the present invention.

Claims

1. foam metal fin, be used for micro-channel heat exchanger, it is characterized in that, described fin is made by foam metal, described fin comprises the sleeve pipe of the flat tube outside that can be installed on described micro-channel heat exchanger, described sleeve pipe upper surface and lower surface are evenly equipped with respectively the fin that the interval arranges, and it is that class isosceles triangle and its waist are that the tri-prismoid of camber line, four prisms cylinder, cross section that the cross section is isosceles trapezoid are that class isosceles trapezoid and its waist are wherein a kind of of four prisms cylinder of camber line that the shape of described fin is selected from tri-prismoid, cross section that the cross section is isosceles triangle.

2. a kind of foam metal fin according to claim 1 is characterized in that, described foam metal is wherein a kind of of foam copper, foamed aluminium, foam iron or nickel foam.

3. a kind of foam metal fin according to claim 1 is characterized in that, the aperture of described foam metal is 0.05 ~ 4mm.

4. a kind of foam metal fin according to claim 1 is characterized in that, the described fin of described sleeve pipe upper surface and the described fin of lower surface are symmetry arrangement or staggered.

5. a kind of foam metal fin according to claim 1 is characterized in that, the thickness of described sleeve pipe is 0.5 ~ 2mm.

6. a kind of foam metal fin according to claim 1 is characterized in that, described fin highest point surface is 3 ~ 10mm to the distance between the described flat tube outer surface.

7. a kind of foam metal fin according to claim 1 is characterized in that, take the line of symmetry of described fin as benchmark, the spacing between the adjacent lugs is 0.5 ~ 10mm.

8. a kind of foam metal fin according to claim 1 is characterized in that, take the intersecting lens of described fin and described sleeve pipe as benchmark, the spacing between the adjacent lugs is 0 ~ 5mm.

9. a kind of foam metal fin according to claim 1 is characterized in that, when described fin was four prisms cylinder, the width of described fin highest point was 0.5 ~ 5mm.

10. a micro-channel heat exchanger comprises a plurality of heat exchanger tubes, it is characterized in that, socket is equipped with foam metal fin as claimed in claim 1 on the described heat exchanger tube.