WO2015090187A1 - Heat exchange unit and heat exchanger - Google Patents

Abstract

Disclosed are a heat exchange unit (10) and a heat exchanger comprising the same. The heat exchange unit (10) comprises a flat pipe (1) and a plurality of fins (2) located on front and rear surfaces of the flat pipe (1), wherein the flat pipe (1) and the plurality of fins (2) are of an integrated structure, the fins (2) are arranged along the width direction of the flat pipe (1), the fins (2) are waterwave-shaped or zigzag, a part connecting the fin (2) and the flat pipe (1) is a root portion, and a part of the fin (2) from the root portion to an end portion is of a cambered surface. The heat exchange unit (10) has high integral rigidity, and is easy to clean and maintain.

Description

Heat exchange unit and heat exchanger Technical field

The invention belongs to the technical field of heat exchangers, and in particular relates to a heat exchange unit and a heat exchanger having the heat exchange unit.

Background technique

Heat exchangers are used in various industrial sectors such as power, metallurgy, chemical, oil refining, construction, machinery manufacturing, food, medicine and aerospace.

At present, the tube-and-belt heat exchanger is provided with a tube bundle between two shells, and the tube bundle is formed by stacking a plurality of heat-dissipating tubes and a heat-dissipating belt, and a heat-dissipating belt is disposed between the adjacent two heat-dissipating tubes, so The strips are stacked and welded into a unit in a vacuum brazing furnace to form a tube bundle; the tube bundle is the core of the tube-and-belt heat exchanger, and the tube bundle is welded between the two shells to form a tube-and-belt heat exchanger.

The hot and cold fluids flow from the inner space of the heat pipe and the space outside the pipe to exchange heat; the tube bundle between the upper and lower shells of the current tube and tube heat exchanger is integrally welded, because of multiple welding The seam makes the pressure capacity of the tube bundle not high; and the structure is complicated, which makes the production efficiency low; at the same time, it needs 5 to 6 hours in the vacuum brazing furnace to complete the welding, so the welding energy consumption is large, and the brazing conditions are very high. The operator is also required to be relatively high; if one weld is not welded well, the entire bundle is waste, and the scrap rate is high. In addition, during the use, one part of the tube bundle is damaged, and the entire tube bundle needs to be replaced, so that the maintenance cost is also high.

Summary of the invention

The invention is directed to the problem that the tube bundle between the upper and lower shells of the heat exchanger existing in the prior art is integrally welded and has a complicated structure, and provides a heat exchange unit, the heat exchange unit is separately formed, the structure is simple, and the manufacturing is convenient. .

In order to achieve the above object, the present invention is implemented by the following technical solutions:

A heat exchange unit comprising a flat tube and a plurality of fins on the front and rear surfaces of the flat tube, the flat tube and the plurality of fins being integrated.

In order to increase the pressure bearing capacity of the heat exchange unit, at least one partition is disposed in the chamber of the flat tube, the partition is disposed along a length direction of the flat tube, and the partition plate is to be the flat tube The chamber is divided into at least two flow channels.

Further, five partitions are disposed in the chamber of the flat tube, and the partition divides the chamber of the flat tube into six flow paths.

Further, the fins are disposed along the width direction of the flat tube.

In order to increase the heat exchange efficiency of the heat exchange unit, increase the contact area between the heat exchange unit and the outer heat exchange medium, and increase the strength of the fin, the fin is water corrugated or sawtooth.

Further, the fin is curved from a root to an end connected to the flat tube.

Further, the heat exchange unit uses 6063 aluminum.

Further, the heat exchange unit is extruded by a hot extrusion process and formed by cutting.

Further, the heat exchange unit forms a heat exchange unit profile after a hot extrusion process, and upper and lower surfaces of the heat exchange unit profile are cut to form the fin.

Further, the flat tube has a wall thickness of 0.6 to 1.2 mm.

Further, the separator has a thickness of 0.7 to 1 mm.

Further, the fin has a thickness of 0.2 to 0.4 mm, and a sheet gap between adjacent fins is 1.2 to 3.5 mm.

Further, the water pressure burst test pressure of the heat exchange unit is 7 MPa.

Based on the heat exchange unit described above, the present invention also provides a heat exchanger using the heat exchange unit described above,

A heat exchanger comprising at least one of the above described heat exchange units.

Further, the heat exchanger includes a plurality of the heat exchange units, an upper casing and a lower casing, and both ends of the heat exchange unit are sealingly connected to the upper casing and the lower casing, respectively. A plurality of the heat exchange units are arranged in parallel or in a staggered arrangement.

Further, the medium of the chamber of the flat tube of the heat exchange unit is air, water or oil.

The heat exchange unit provided by the invention has simple structure, simple manufacturing process, improved production efficiency, reduced production cost, reduced waste rate, reduced energy consumption due to no vacuum brazing, and no requirement for operator level. high. The heat exchange unit of the invention has high overall rigidity and is particularly suitable for being made into a super-large heat exchanger; the cost is low, and the structure can be widely applied to heat exchangers in various application fields; in addition, the cleaning and maintenance is simple, and the high-pressure water flow can be directly used. Flush the outer surface of the heat exchange unit, the fins will not fall, and can be applied In desert and dusty environments.

Other features and advantages of the present invention will become apparent from the Detailed Description of the Drawing.

DRAWINGS

1 is a schematic structural view of an embodiment of a heat exchange unit according to the present invention;

Figure 2 is a side view of the structure of Figure 1;

Figure 3 is a schematic enlarged plan view of the top view of Figure 1;

4 is a schematic structural view of an embodiment of a heat exchanger according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it is to be noted that the orientation or positional relationship of the terms "front", "back", "inside", "upper", "lower", etc. is based on the positional relationship shown in the drawings, only It is to be understood that the invention is not to be construed as a limitation of the invention.

Referring to Figures 1-3, there is shown an embodiment of the heat exchange unit of the present invention, wherein the drawings are merely schematic structural views, and the pitch of the fins is enlarged in order to show the structure of the heat exchange unit.

The heat exchange unit 10 includes a flat tube 1 and a plurality of fins 2 on the front and rear surfaces of the flat tube 1, wherein the flat tube 1 and the plurality of fins 2 are integral.

In this embodiment, the heat exchange unit 10 is composed of a flat tube 1 and a plurality of fins 2 on the front and rear surfaces of the flat tube 1. The structure is simple, and one or more heat exchange units 10 are mounted between the upper and lower housings to form a change. The heat exchanger, because of the manufacture of the separate heat exchange unit 10, reduces the manufacturing difficulty, improves the work efficiency, and reduces the scrap rate; at the same time, the flat tube 1 and the plurality of fins 2 are integrated, which improves the overall strength of the heat exchange unit 10. .

In order to increase the pressure bearing capacity of the heat exchange unit 10, five partitions 3 are provided in the chamber of the flat tube 1, and the partition plate 3 is disposed along the length direction of the flat tube 1, so that the partition plate 3 divides the chamber of the flat tube 1 Into six flow paths. By setting the partition 3, the strength of the flat tube 1 is increased, and the pressure bearing capacity is improved; and the flat tube 1 is also added. The area of the inner medium in contact with the flat tube 1 is favorable for heat conduction and improves the heat exchange capacity of the heat exchange unit 10, as shown in FIG.

In this embodiment, each fin 2 is disposed along the width direction of the flat tube 1. In order to increase the heat exchange efficiency of the heat exchange unit 10, the contact area between the heat exchange unit 10 and the external heat exchange medium is increased. The sheet 2 is arranged in a water corrugated shape or a zigzag shape, which increases the contact area between the fin 2 and the external heat exchange medium, improves the heat exchange efficiency, and increases the strength of the fin 2, see FIGS. 1 and 3 Shown.

Referring to Fig. 2, the fins 2 are curved from the root to the end of the flat tube 1, which further increases the strength of the fins 2.

In this embodiment, the heat exchange unit 10 is made of 6063 aluminum material and is formed by a continuous hot extrusion process, and the maximum continuous length is up to 6 meters. At this time, the extruded material is a profile, before and after the extruded profile is passed through the cutting device. The fins 2 are cut out on both sides. After the cutting, the flat tube 1 and the plurality of fins 2 on the front and rear surfaces of the flat tube 1 are formed, that is, the roots of the flat tube 1 and the fin 2 are connected together; the manufacturing process is simple, and the vacuum brazing furnace is avoided. Welding, saving energy, improving efficiency, reducing production costs, and technical requirements for operators are not high.

In the present embodiment, the thickness of the flat tube 1 is 0.6 to 1.2 mm; the thickness of the spacer 3 is 0.7 to 1 mm; the thickness of the fin 2 is 0.2 to 0.4 mm, and the interval between adjacent fins 2 is 1.2. ~3.5mm. The pressure of the water pressure subjected to the hydraulic blasting test of the heat exchange unit in the present embodiment can reach 7 MPa.

In this embodiment, the heat exchange unit 10 has a simple structure and high strength, so that the cleaning and maintenance is simple, and the fins 2 can be directly washed by the high-pressure water flow without lodging, and can be applied to desert and dust environments.

Referring to FIG. 4, which is an embodiment of a heat exchanger according to the present invention, the heat exchanger includes a plurality of heat exchange units 10, an upper casing 20 and a lower casing 30, and the two ends of the heat exchange unit 10 are respectively The upper casing 20 and the lower casing 30 are sealingly connected, and the plurality of heat exchange units 10 are arranged in parallel or staggered.

Thus, the plurality of heat exchange units 10 are hermetically welded between the upper casing 20 and the lower casing 30. When one heat exchange unit 10 needs to be replaced, only one heat exchange unit 10 needs to be replaced, which reduces maintenance costs.

The medium of the chamber of the flat tube of the heat exchange unit in the heat exchanger may be air, water or oil. In this embodiment, the heat exchange medium inside and outside the heat exchanger is not limited.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art may use the above-disclosed technical contents to change or modify the equivalent equivalent. Example. However, the technology according to the present invention is not deviated from the technical solution of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of protection of the technical solutions of the present invention.

Claims (7)

A heat exchange unit comprising a flat tube and a plurality of fins on the front and rear surfaces of the flat tube, wherein the flat tube and the plurality of fins are extruded by a hot extrusion process and formed by cutting In an integrated structure, the fins are disposed along a width direction of the flat tube, the fins are water corrugated or zigzag, and a portion where the fins are connected to the flat tube is a root portion, and the fins are The root to the end is curved. The heat exchange unit according to claim 1, wherein at least one partition is disposed in a chamber of the flat tube, and the partition is disposed along a length direction of the flat tube, and the partition is The chamber of the flat tube is divided into at least two flow channels. The heat exchange unit according to claim 1 or 2, wherein the flat tube has a wall thickness of 0.6 to 1.2 mm. The heat exchange unit according to claim 1 or 2, wherein the fin has a thickness of 0.2 to 0.4 mm, and a sheet pitch between adjacent fins is 1.2 to 3.5 mm. The heat exchange unit according to claim 2, wherein the separator has a thickness of 0.7 to 1 mm. A heat exchanger, characterized in that the heat exchanger comprises at least one heat exchange unit according to any one of claims 1 to 5. The heat exchanger according to claim 6, wherein said heat exchanger comprises a plurality of said heat exchange units, said heat exchanger further comprising an upper casing and a lower casing, said heat exchange unit The two ends are respectively connected to the upper casing and the lower casing, and the plurality of heat exchange units are arranged in parallel or staggered.

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