Fin coil heat exchanger

Abstract

The present invention relates to the technical field of heat exchangers, and in particular to a fin coil heat exchanger, wherein a fin group is arranged in a heat exchanger shell, and at least two rows of heat exchange tube holes vertically penetrating the fin group are distributed on the fin group, and the heat exchange tube holes are staggered on the fin group, and a heat exchange tube is arranged in each of the heat exchange tube holes, and the fin group includes a plurality of corrugated fins arranged in parallel and at intervals; a plurality of polygonal fins are arranged on the corrugated fins, and the plurality of polygonal fins are located around the outer side of the heat exchange tube, thereby improving the heat exchange efficiency, increasing the heat transfer coefficient, and improving the pressure drop to a certain extent, and under the same pressure drop condition, the heat transfer coefficient is higher than that of an ordinary heat exchanger.

Description

Technical Field

[0001] The invention relates to the technical field of air heat exchangers, and in particular to a fin coil heat exchanger. Background Art

[0002] At present, since the fin coil heat exchanger needs to exchange heat with the fins through air, when the air passes through the gap between the fins, it will pass through the heat exchange tube. When the air converges on both sides of the heat exchange tube, the air flow on the outside will be squeezed inward, causing a swirling airflow to form on the rear side of the heat exchange tube. The swirling airflow occurring in the heat exchanger will cause the airflow on both sides that has been cooled by heat conduction to stop at the rear of the pipe, reducing the heat transfer coefficient, and further resulting in a low overall heat transfer efficiency in the heat exchanger, which is not what the technicians in this field want to see. Summary of the invention

[0003] In view of the above problems, the present invention discloses a fin coil heat exchanger, which includes a heat exchanger shell;

[0004] A fin group is arranged in the heat exchanger shell, and at least two rows of heat exchange tube holes are distributed on the fin group and vertically penetrate the fin group. The heat exchange tube holes are arranged in a staggered manner on the fin group, and a heat exchange tube is arranged in each of the heat exchange tube holes. The fin group includes a plurality of corrugated fins arranged in parallel and at intervals.

[0005] A plurality of polygonal fins are arranged on the corrugated fins, and the plurality of polygonal fins are all located around the outer side of the heat exchange tube.

[0006] Preferably, the polygonal fins are located at the rear side of the heat exchange tube in the wind direction, and the starting points of the polygonal fins are located at the intersections of the horizontal tangent and the vertical tangent of the outer circle of the cross-sectional ring of the heat exchange tube.

[0007] Preferably, the heat exchange tube holes in the same row on the fin group are arranged in a sinusoidal wave.

[0008] Preferably, the corrugated fins are sinusoidal corrugated fins.

[0009] Preferably, the polygonal fin is a triangular fin, and the height of the triangular fin is 60% to 80% of the spacing between adjacent corrugated fins.

[0010] Preferably, the polygonal fin is a shark fin-shaped fin, and the height of the shark fin-shaped fin is 70% to 90% of the spacing between adjacent corrugated fins.

[0011] Preferably, the method for forming the shark fin-shaped wing comprises:

[0012] Step S1, providing a reference triangle, wherein the reference triangle is a right triangle having a horizontal right-angle side and a vertical right-angle side;

[0013] Step S2, drawing a first extension line horizontally from the vertex of the vertical right-angled side as a starting point in a direction away from the hypotenuse of the reference triangle;

[0014] Step S3, forming a first reference circle with a first radius as a radius, and making the vertex of the first reference circle located on the first extension line, and the first reference circle intersects with the acute angle end of the horizontal right-angled side;

[0015] Step S4, forming a second reference circle with a second radius as a radius, wherein the second radius is smaller than the first radius, and the vertex of the second reference circle intersects the first extension line, and the second reference circle intersects the right-angle end of the horizontal right-angle side;

[0016] Among them, the arc line of the first reference circle between the vertex of the first reference circle and the acute angle end of the horizontal right angle side is the first side of the shark fin shaped fin, the arc line of the second reference circle between the vertex of the second reference circle and the right angle end of the horizontal right angle side is the second side of the shark fin shaped fin, the straight line between the vertical right angle side and the vertex of the second reference circle is the top edge of the shark fin shaped fin, and the horizontal right angle side is the bottom edge of the shark fin shaped fin.

[0017] Preferably, the method for forming the shark fin-shaped wing further comprises:

[0018] Step S5, drawing a second extension line horizontally from the acute angle end of the horizontal right-angled side as a starting point in a direction away from the horizontal right-angled side;

[0019] Step S6, forming a third reference circle with a third radius as a radius, wherein the lowest point of the third reference circle is located on the second extension line, and the third reference circle intersects with the first side edge;

[0020] Wherein, a continuous line between the lowest point of the third reference circle and the vertex of the first reference circle is a new first side edge of the shark fin-shaped wing.

[0021] Preferably, the length of the first radius is 4 to 8 times the height of the vertical right-angled side, the length of the second radius is 1 to 4 times the height of the vertical right-angled side, and the length of the third radius is 2 to 4 times the height of the vertical right-angled side.

[0022] Preferably, the angle of attack of the shark fin-shaped wing is 20-35°.

[0023] The above invention has the following advantages or beneficial effects:

[0024] The present invention discloses a fin coil heat exchanger, in which a fin group is arranged in a heat exchanger shell, and at least two rows of heat exchange tube holes vertically penetrating the fin group are distributed on the fin group, and the heat exchange tube holes are arranged alternately on the fin group, and a heat exchange tube is arranged in each of the heat exchange tube holes, and the fin group includes a plurality of corrugated fins arranged in parallel and at intervals; a plurality of polygonal fins are arranged on the corrugated fins, and the plurality of polygonal fins are located around the outer side of the heat exchange tube, thereby improving the heat exchange efficiency, increasing the heat transfer coefficient, and improving the pressure drop to a certain extent, and under the same pressure drop condition, the heat transfer coefficient is higher than that of an ordinary heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and emphasis is placed on illustrating the subject matter of the present invention.

[0026] Figure 1 Schematic diagram of the structure of the fin coil heat exchanger in the embodiment of the present invention;

[0027] Figure 2 It is a cross-sectional view at AA in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 An enlarged schematic diagram of the heat exchange tubes and fins;

[0029] Figure 4 It is a schematic diagram of the structure of a shark fin-shaped wing in one embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of the structure of the reference triangle;

[0031] Figure 6 for Figure 4 Schematic diagram of the formation process of the shark fin-shaped wing flap;

[0032] Figure 7 It is a schematic structural diagram of a shark fin-shaped wing in another embodiment of the present invention;

[0033] Figure 8 for Figure 7 Schematic diagram of the formation process of the shark fin-shaped wing flap. DETAILED DESCRIPTION

[0034] The present invention discloses a fin coil heat exchanger. Specifically, a fin group is arranged in a shell of the heat exchanger. At least two rows of heat exchange tube holes vertically penetrating the fin group are distributed on the fin group. The heat exchange tube holes are arranged alternately on the fin group, and a heat exchange tube is arranged in each of the heat exchange tube holes. The fin group includes a plurality of corrugated fins arranged in parallel and at intervals; a plurality of polygonal fins are arranged on the corrugated fins, and the plurality of polygonal fins are all located around the outer side of the heat exchange tube.

[0035] The present invention is further described below with reference to the accompanying drawings and specific embodiments, but is not intended to be a limitation of the present invention.

[0036] like Figures 1 to 8 As shown, this embodiment discloses a fin coil heat exchanger. Specifically, the fin coil heat exchanger includes a heat exchanger shell 1 and a first end plate 4 and a second end plate 5 arranged on both sides of the heat exchanger shell 1. Figure 1 and Figure 2 In the embodiment, the air inlet of the heat exchanger is located at the bottom, the air outlet is located at the top, and the wind direction moves from the bottom to the top; a fin group is arranged in the heat exchanger shell 1, and at least two rows of heat exchange tube holes vertically penetrating the fin group are distributed on the fin group, and the heat exchange tube holes are arranged alternately on the fin group, and a heat exchange tube 2 is arranged in each heat exchange tube hole, and the fin group includes a plurality of corrugated fins 3 arranged in parallel on the left and right (in other embodiments of the present invention, the plurality of corrugated fins 3 in the fin group can also be arranged in parallel up and down, depending on whether the heat exchanger is placed horizontally or vertically. In this embodiment, the heat exchanger is placed horizontally, and the plurality of corrugated fins 3 in the fin group are arranged in parallel on the left and right, and the spacing between adjacent corrugated fins 3 is equal); a plurality of polygonal fins 6 are arranged on the corrugated fin 3, and the plurality of polygonal fins 6 are all located around the outer side of the heat exchange tube 2.

[0037] Specifically, the polygonal fin 6 is located at the rear side of the heat exchange tube 2 in the wind direction. This is in the order of the air inlet as the front side and the air outlet as the rear side. The polygonal fin 6 is located at the rear side of the heat exchange tube 2, and the starting point of the polygonal fin 6 is located on the intersection of the horizontal tangent 71 and the vertical tangent 72 of the outer circle of the cross-sectional ring of the heat exchange tube 2 and the extension line of the corresponding pipeline center point to ensure the defrosting efficiency. Preferably, the starting point of the polygonal fin 6 is located at the intersection of the horizontal tangent 71 and the vertical tangent 72 of the outer circle of the cross-sectional ring of the heat exchange tube 2, such as Figure 3 The structure shown. The angle of attack β of the polygonal wing 6 is the angle between the polygonal wing 6 and the vertical tangent 72. β should be between 20° and 60°, preferably between 20° and 35°; Figure 3 The median β is 30°.

[0038] In a preferred embodiment of the present invention, Figure 2As shown, the heat exchange tube holes in the same row on the fin group are arranged in a sinusoidal wave, so that the heat exchange tubes 2 arranged therein are arranged in a sinusoidal wave in the same row. Under this arrangement, the distance between the pipe and all two adjacent pipes is the same, forming an equilateral triangle shape. The heat exchange tubes in the same row are arranged in a sinusoidal wave. The heat exchange efficiency and heat transfer coefficient of the sinusoidal coil arrangement are higher than those of the ordinary staggered arrangement, and the heat exchange efficiency and heat transfer coefficient of the staggered arrangement are higher than those of the straight arrangement; wherein the horizontal line 31 between the heat exchange tubes is the required spacing of the fin slices required for production.

[0039] In a preferred embodiment of the present invention, Figure 1 As shown, the corrugated fin 3 is a sinusoidal corrugated fin, that is, the corrugated fin adopts a sinusoidal wave shape, and the shape of the sinusoidal corrugated fin is similar to a sine wave. The heat exchange efficiency and heat transfer coefficient of the sinusoidal corrugated fin are higher than those of the flat fin. In addition, since the sinusoidal corrugated fin has less swirling (retained) airflow behind the corrugations than the corrugated fin, the heat exchange efficiency and heat transfer coefficient of the sinusoidal corrugated fin are higher than those of the corrugated fin.

[0040] In the present invention, the heat exchanger uses a circular coil as a heat exchange tube 2 to transport a liquid working fluid. When punching the corrugated fins, a CNC die is used to generate the polygonal fins around the heat exchange tube 2 as vortex generators. Specifically, the polygonal fins 6 can be triangular fins, trapezoidal fins, semi-elliptical fins, rectangular fins or shark fin-shaped fins, etc. The height of the polygonal fins 6 is 60%-100% of the spacing between adjacent corrugated fins, wherein the height of the triangular fins is preferably 60%-80%, which is conducive to production. The height of the triangular fins is preferably 60% to 80% of the spacing between adjacent corrugated fins 3; the thickness of the corrugated fins 3 is 0.18mm to 0.5mm, and the polygonal fins 6 are usually perpendicular to the fins, but can also form other angles with the fins.

[0041] The polygonal fin 6 is preferably a shark fin-shaped fin, and the height of the shark fin-shaped fin is preferably 70% to 90% of the distance between adjacent corrugated fins 3. The shark fin-shaped fin is specifically taken as an example for description.

[0042] In a preferred embodiment of the present invention, Figures 4 to 6 As shown, the common method of forming a shark fin-shaped winglet formed by two reference circles includes:

[0043] Step S1, providing a reference triangle, where the reference triangle is a right triangle having horizontal right-angled sides and vertical right-angled sides.

[0044] Step S2, drawing a first extension line horizontally from the vertex of the vertical right-angled side as a starting point in a direction away from the hypotenuse of the reference triangle.

[0045] Step S3 , forming a first reference circle C1 with V (first radius) as the radius, and making the vertex of the first reference circle C1 located on the first extension line, and the first reference circle C1 intersects the acute angle end of the horizontal right-angled side.

[0046] Step S4, forming a second reference circle C2 with U (second radius) as the radius, the second radius U is smaller than the first radius V, the vertex of the second reference circle C2 intersects with the first extension line, and the second reference circle C2 intersects with the right angle end of the horizontal right angle side.

[0047] Among them, the arc between the vertex of the first reference circle C1 and the acute angle end of the horizontal right angle side of the first reference circle C1 is the first side of the shark fin-shaped fin, the arc between the vertex of the second reference circle C2 and the right angle end of the horizontal right angle side of the second reference circle C2 is the second side of the shark fin-shaped fin, the straight line between the vertical right angle side and the vertex of the second reference circle C2 is the top side, and the horizontal right angle side is the bottom side of the shark fin-shaped fin; the shark fin-shaped fin formed by the two reference circles can be used as a basic fin; in an embodiment of the present invention, the arc generated by the second reference circle C2 can also be replaced by a straight line. Since the surface area of ​​the shark fin-shaped fin is larger than that of the triangular fin, the air resistance and pressure drop generated will be greater than those of the triangular fin. Since it is easier to form vortices in fluid mechanics, its heat exchange efficiency and heat transfer coefficient are higher than those of the triangular fin; the sharp corner of the upper rear side of the shark fin-shaped fin of the present invention can be changed to a rounded corner to reduce the difficulty of production. This operation cannot be implemented on the triangular fin, and the rounded corner has a slight effect on the generation of vortices.

[0048] Specifically, the length of the radius (V) of the first reference circle C1 is 2 to 8 times the height of the vertical right-angled side (i.e., the height of the shark fin-shaped wing), and preferably, the length of the radius of the first reference circle C1 is 4 to 8 times the height of the vertical right-angled side; the length of the radius (U) of the second reference circle C2 is 1 to 6 times the height of the vertical right-angled side, and preferably, the length of the radius of the second reference circle C2 is 1 to 4 times the height of the vertical right-angled side;

[0049] In another preferred embodiment of the present invention, Figure 7 and Figure 8 As shown, a shark fin-shaped winglet can also be deformed by three reference circles, which is performed on the basis of the above steps S1 to S4. Specifically, the method for forming the deformed shark fin-shaped winglet further includes the following steps based on the above steps S1 to S4:

[0050] Step S5, drawing a second extension line horizontally from the acute angle end of the horizontal right angle side as a starting point in a direction away from the horizontal right angle side;

[0051] Step S6, forming a third reference circle C3 with W (third radius) as the radius, the lowest point of the third reference circle C3 is located on the second extension line, and the third reference circle C3 intersects with the first side edge;

[0052] The continuous line between the lowest point of the third reference circle C3 and the vertex of the first reference circle C1 is the new first side edge of the shark fin-shaped wing.

[0053] Specifically, the length of the radius (W) of the third reference circle C3 is 1 to 4 times the height of the vertical right-angled side. Preferably, the length of the radius of the third reference circle C3 is 2 to 4 times the height of the vertical right-angled side.

[0054] In a preferred embodiment of the present invention, the ratio of the length of one side of the shark fin-shaped fin connected to the corrugated fin 3 to the fin height should be between 1:1 and 8:1. For triangular fins, the ratio is preferably 2:1. For quadrilateral fins, the ratio is preferably 5:1. For shark fins, the ratio is preferably 2:1.

[0055] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0056] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A fin coil heat exchanger, characterized in that: including a heat exchanger housing; A fin group is arranged in the heat exchanger shell, and at least two rows of heat exchange tube holes are distributed on the fin group and vertically penetrate the fin group. The heat exchange tube holes are arranged in a staggered manner on the fin group, and a heat exchange tube is arranged in each of the heat exchange tube holes. The fin group includes a plurality of corrugated fins arranged in parallel and at intervals. The corrugated fin is provided with a plurality of polygonal fins, and the plurality of polygonal fins are all located around the outer side of the heat exchange tube, the polygonal fins are located at the rear side of the heat exchange tube in the wind direction, and the starting points of the polygonal fins are all located at the intersection of the horizontal tangent and the vertical tangent of the outer circle of the cross-section ring of the heat exchange tube; The polygonal wing is a shark fin-shaped wing, and the formation method of the shark fin-shaped wing includes: Step S1, providing a reference triangle, wherein the reference triangle is a right triangle having a horizontal right-angle side and a vertical right-angle side; Step S2, drawing a first extension line horizontally from the vertex of the vertical right-angled side as a starting point in a direction away from the hypotenuse of the reference triangle; Step S3, forming a first reference circle with a first radius as a radius, and making the vertex of the first reference circle located on the first extension line, and the first reference circle intersects with the acute angle end of the horizontal right-angled side; Step S4, forming a second reference circle with a second radius as a radius, wherein the second radius is smaller than the first radius, and the vertex of the second reference circle intersects the first extension line, and the second reference circle intersects the right-angle end of the horizontal right-angle side; Among them, the arc line of the first reference circle between the vertex of the first reference circle and the acute angle end of the horizontal right angle side is the first side of the shark fin shaped fin, the arc line of the second reference circle between the vertex of the second reference circle and the right angle end of the horizontal right angle side is the second side of the shark fin shaped fin, the straight line between the vertical right angle side and the vertex of the second reference circle is the top edge of the shark fin shaped fin, and the horizontal right angle side is the bottom edge of the shark fin shaped fin.

2. The fin coil heat exchanger according to claim 1, characterized in that: The heat exchange tube holes in the same row on the fin group are arranged in a sinusoidal wave.

3. The fin coil heat exchanger according to claim 1, characterized in that: The corrugated fins are sinusoidal corrugated fins.

4. The fin coil heat exchanger according to claim 1, characterized in that: The height of the shark fin-shaped fin is 70% to 90% of the distance between adjacent corrugated fins.

5. The fin coil heat exchanger according to claim 1, characterized in that: The method for forming the shark fin-shaped wing piece further includes: Step S5, drawing a second extension line horizontally from the acute angle end of the horizontal right-angled side as a starting point in a direction away from the horizontal right-angled side; Step S6, forming a third reference circle with a third radius as a radius, wherein the lowest point of the third reference circle is located on the second extension line, and the third reference circle intersects with the first side edge; Wherein, a continuous line between the lowest point of the third reference circle and the vertex of the first reference circle is a new first side edge of the shark fin-shaped wing.

6. The fin coil heat exchanger according to claim 5, characterized in that: The length of the first radius is 4 to 8 times the height of the vertical right-angled side, the length of the second radius is 1 to 4 times the height of the vertical right-angled side, and the length of the third radius is 2 to 4 times the height of the vertical right-angled side.

7. The fin coil heat exchanger according to claim 1, characterized in that: The angle of attack of the shark fin-shaped wing is the angle between the polygonal wing and the vertical tangent, and the angle of attack of the shark fin-shaped wing is 20-35°.

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