Heat exchanger and fan coil

Abstract

The utility model provides a heat exchanger and fan coil, including first header pipe, second header pipe and a plurality of side-by-side heat exchange pipe, each heat exchange pipe one end is communicated with the first header pipe, the other end is communicated with the second header pipe, the heat exchange pipe is made of aluminum alloy, the heat exchange pipe is internally provided with a circulation cavity for fluid to flow, and the circulation cavity is communicated with the first header pipe and the second header pipe. An anti-corrosion coating is arranged on the inner wall forming the circulation cavity. According to the scheme, the heat exchange tube is made of aluminum alloy, compared with a copper heat exchange tube, the cost can be reduced, and due to the fact that the anti-corrosion coating is arranged on the inner wall of the circulation cavity of the heat exchange tube, corrosion of water or other heat exchange media in the circulation cavity to the aluminum heat exchange tube is avoided or reduced, and the service life of the heat exchange tube is prolonged. Therefore, the heat exchange performance and the service life of the heat exchanger are prevented from being influenced by corrosion. Therefore, according to the scheme, the purposes that the cost is reduced by using the aluminum heat exchange tube, and the heat exchange tube is not prone to being corroded are achieved, and the cost and performance requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, and in particular to a heat exchanger and a fan coil unit. Background Art

[0002] As one of the most important components in air conditioning systems, finned tube heat exchangers are widely used in the air conditioning industry. For fan coil units, conventional heat exchangers are mostly copper tube aluminum fin heat exchangers. Although they can meet the existing performance standards, the cost of fan coil units continues to rise with the continuous rise in copper prices. As a substitute for copper in the air conditioning industry, aluminum has a significantly lower cost, although the thermal conductivity is half that of copper, and has a higher replacement value.

[0003] In some existing air conditioning systems, heat exchangers with aluminum heat exchange tubes are used to replace air conditioners with copper heat exchange tubes to reduce costs. However, when the fan coil unit is used as the end of the chiller, the water flowing in the heat exchange tubes will corrode the aluminum heat exchange tubes, affecting the heat exchange performance and service life of the heat exchanger. Utility Model Content

[0004] The utility model provides a heat exchanger and a fan coil unit to solve the problem that the aluminum heat exchange tubes in the heat exchanger in the prior art are easily corroded by water, thereby avoiding the influence of corrosion on the heat exchange performance and service life of the heat exchanger.

[0005] In order to solve the above problems, according to one aspect of the utility model, the utility model provides a heat exchanger, including a first collecting pipe, a second collecting pipe and a plurality of heat exchange tubes arranged side by side, one end of each heat exchange tube is connected to the first collecting pipe, and the other end is connected to the second collecting pipe. The material of the heat exchange tube is aluminum alloy, and the heat exchange tube has a flow cavity for fluid flow, and the inner wall of the flow cavity is provided with an anti-corrosion coating.

[0006] Furthermore, the anti-corrosion coating is a plastic spray coating, and the thickness of the plastic spray coating is 85 to 200 μm; or,

[0007] The anti-corrosion coating is an electrophoretic coating, and the thickness of the electrophoretic coating is 100 to 250 μm; or,

[0008] The anti-corrosion coating is a TCP coating, and the thickness of the TCP coating is 10 to 100 μm.

[0009] Furthermore, the heat exchange tube is a flat tube having a flow cavity which is a single cavity and a cross section of the flow cavity is an oblong hole or an ellipse.

[0010] Furthermore, the heat exchange tube is a flat tube, which includes a peripheral plate and multiple partitions. The area surrounded by the peripheral plate forms a flow cavity. The multiple partitions are located in the flow cavity to divide the flow cavity into multiple side-by-side sub-cavities; wherein the surfaces of the peripheral plate and the partitions are both provided with an anti-corrosion coating.

[0011] Furthermore, the flat tube is formed by bending a whole flat plate, and before the flat plate is bent, an anti-corrosion coating is provided on two opposite maximum surfaces.

[0012] Furthermore, the heat exchange tube is a flat tube, the wall thickness of the flat tube is 0.2 mm to 0.8 mm, the overall thickness of the flat tube is 1 to 4 mm, and the distance between two adjacent flat tubes is 5 to 15 mm.

[0013] Furthermore, the materials of the first current collecting pipe and the second current collecting pipe are both aluminum alloy, and the inner walls of the first current collecting pipe and the second current collecting pipe are provided with anti-corrosion coatings.

[0014] Furthermore, the heat exchange tube is a flat tube, and the heat exchanger also includes flat fins, which include a main plate and a plurality of insert plates arranged at intervals in the length direction of the main plate, at least part of the insert plates are inserted into the gap between two adjacent flat tubes, and the length direction of the fin is perpendicular to the extension direction of the flat tube; there are multiple fins, and the multiple fins are spaced apart along the extension direction of the flat tube.

[0015] Furthermore, the heat exchange tube is a flat tube, which includes a first straight section, a bent section and a second straight section connected in sequence, the first straight section and the second straight section are arranged in parallel, the first collecting tube and the second collecting tube are arranged side by side, one end of the first straight section away from the bent section is connected to the first collecting tube, and one end of the second straight section away from the bent section is connected to the second collecting tube.

[0016] Furthermore, the heat exchanger also includes a plurality of fins, which are cooperatively connected with a plurality of heat exchange tubes. The material of the fins is aluminum alloy. A liquid inlet joint is provided at the bottom of the first collecting pipe, and a liquid outlet joint is provided at the top of the second collecting pipe.

[0017] According to another aspect of the present invention, a fan coil unit is provided. The fan coil unit includes a fan and the above-mentioned heat exchanger.

[0018] The technical solution of the utility model is applied to provide a heat exchanger, including a first header, a second header and a plurality of heat exchange tubes arranged side by side, one end of each heat exchange tube is connected to the first header and the other end is connected to the second header, the material of the heat exchange tube is aluminum alloy, the heat exchange tube has a flow cavity for fluid flow, and the inner wall of the flow cavity is provided with an anti-corrosion coating. In this solution, the material of the heat exchange tube is aluminum alloy, which can reduce the cost compared with copper heat exchange tubes. Since the anti-corrosion coating is provided on the inner wall of the flow cavity of the heat exchange tube, the corrosion of the aluminum heat exchange tube by water or other heat exchange media in the flow cavity is avoided or reduced, thereby avoiding the influence of corrosion on the heat exchange performance and service life of the heat exchanger. Therefore, this solution achieves the purpose of reducing costs by using aluminum heat exchange tubes, and the heat exchange tubes are not easily corroded, meeting the cost and performance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 A schematic structural diagram of a heat exchanger provided in an embodiment of the utility model is shown;

[0021] Figure 2 A schematic diagram of a flat tube in a heat exchanger is shown;

[0022] Figure 3 A schematic diagram showing another type of flat tube in a heat exchanger;

[0023] Figure 4 A schematic diagram showing the matching of flat tubes and fins in a heat exchanger provided in an embodiment of the utility model is shown;

[0024] Figure 5 Shows Figure 4 Schematic diagram of the fins in FIG.

[0025] Figure 6 Shows Figure 1 Schematic diagram of the flat tube in FIG.

[0026] Figure 7 A schematic diagram of a fan coil unit provided in an embodiment of the utility model is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. First header; 20. Second header; 30. Heat exchange tube; 31. Circulation cavity; 32. Peripheral plate; 33. Partition plate; 34. First straight section; 35. Bend section; 36. Second straight section; 40. Fin; 41. Main sheet; 42. Insert; 50. Liquid inlet connector; 60. Liquid outlet connector; 70. Fan. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0030] like Figures 1 to 6 As shown, an embodiment of the utility model provides a heat exchanger, including a first header 10, a second header 20 and a plurality of heat exchange tubes 30 arranged side by side, one end of each heat exchange tube 30 is connected to the first header 10, and the other end is connected to the second header 20, the material of the heat exchange tube 30 is aluminum alloy, and the heat exchange tube 30 has a flow cavity 31 for fluid flow, and the inner wall of the flow cavity 31 is provided with an anti-corrosion coating.

[0031] In this solution, the material of the heat exchange tube 30 is aluminum alloy, which can reduce the cost compared with copper heat exchange tubes. Since an anti-corrosion coating is provided on the inner wall of the circulation cavity of the heat exchange tube 30, the corrosion of the aluminum heat exchange tube 30 by water or other heat exchange media in the circulation cavity 31 is avoided or reduced, thereby avoiding the influence of corrosion on the heat exchange performance and service life of the heat exchanger. Therefore, this solution achieves the purpose of using aluminum heat exchange tubes to reduce costs, and the heat exchange tubes are not easily corroded, meeting the cost and performance requirements.

[0032] There are many options for the material and process of the anti-corrosion coating. For example, the anti-corrosion coating is a plastic spray coating with a thickness of 85 to 200 μm. This method is more suitable for use in environments with low corrosiveness.

[0033] Alternatively, the anti-corrosion coating is an electrophoretic coating, and the thickness of the electrophoretic coating is 100 to 250 μm. This method has strong anti-corrosion ability and is suitable for use in highly corrosive environments.

[0034] Alternatively, the anti-corrosion coating is a TCP coating, the thickness of which is 10 to 100 μm. This method has a strong anti-corrosion capability and is suitable for use in highly corrosive environments. TCP refers to a trivalent chromium process.

[0035] In this embodiment, the heat exchange tube 30 can be a conventional round tube. Figure 2 As shown, the heat exchange tube 30 is a flat tube having a flow cavity 31. The flow cavity 31 is a single cavity, and the cross section of the flow cavity 31 is an oblong hole or an ellipse. The flow cavity 31 is a single cavity, so the flow area is large, and it is convenient to set an anti-corrosion coating on the inner wall of the flow cavity 31 by electrophoresis or other processes.

[0036] like Figure 3 As shown, in another embodiment, the flat tube includes an outer peripheral plate 32 and a plurality of partitions 33. The area surrounded by the outer peripheral plate 32 forms a flow cavity 31. The plurality of partitions 33 are located in the flow cavity 31 to divide the flow cavity 31 into a plurality of side-by-side sub-cavities. The surfaces of the outer peripheral plate 32 and the partitions 33 are both provided with an anti-corrosion coating. This method is to provide an anti-corrosion coating on the inner wall of each sub-cavity, thereby preventing water flow from corroding the inner wall of the sub-cavity.

[0037] In this embodiment, the flat tube can be formed by bending a whole flat plate, and the flat plate is provided with an anti-corrosion coating on two opposite maximum surfaces before being bent. Since the anti-corrosion coating is first provided on the flat plate and then bent to form the flat tube, the inner wall of each sub-cavity also has the anti-corrosion coating, and this method reduces the difficulty of processing the anti-corrosion coating.

[0038] In this solution, the wall thickness of the flat tube is 0.2 mm to 0.8 mm, for example, 0.3 to 0.45 mm. When the bursting pressure is met, the wall thickness of the flat tube is designed to be relatively thin, so that the cross-sectional area of ​​the flow cavity 31 can be increased, thereby maximizing the heat exchange performance.

[0039] The overall thickness of the flat tube is 1 to 4 mm, such as 1.3 to 2 mm, and the distance between two adjacent flat tubes is 5 to 15 mm, such as 7.6 to 11 mm. In this way, the number of flat tubes is relatively large and the density is high in a limited space, and the water flow can be dispersed to more flat tubes, reducing the flow resistance of water and improving the heat exchange effect. Due to the thinner thickness of the flat tube, more tubes can be arranged in the same space compared with circular tubes, and the water resistance will not be increased compared with circular tubes.

[0040] Furthermore, the materials of the first header 10 and the second header 20 are both aluminum alloy, and the inner walls of the first header 10 and the second header 20 are provided with an anti-corrosion coating. This can reduce the cost compared with the copper header, and because the anti-corrosion coating is provided on the inner wall of the header, the corrosion of the aluminum header by water or other heat exchange media in the header is avoided or reduced, thereby avoiding the influence of corrosion on the heat exchange performance and service life of the heat exchanger.

[0041] like Figure 4 and Figure 5As shown, the heat exchange tube 30 is a flat tube, and the heat exchanger also includes a flat fin 40. The fin 40 includes a main sheet 41 and a plurality of inserts 42 arranged at intervals in the length direction of the main sheet 41. At least part of the inserts 42 are inserted into the gap between two adjacent flat tubes. The length direction of the fin 40 is perpendicular to the extension direction of the flat tube. There are multiple fins 40, and the multiple fins 40 are distributed at intervals along the extension direction of the flat tube. By setting multiple fins 40, the heat exchange area of ​​the heat exchanger is increased, and the heat exchange effect is improved. In addition, due to the use of flat fins 40, when condensed water is generated on the surface of the heat exchanger, the fins 40 can effectively discharge the condensed water, thereby increasing the heat exchange effect. After the fins 40 are assembled with the flat tubes, they can be fixedly connected by furnace welding or other methods.

[0042] like Figure 1 and Figure 6 As shown, the flat tube includes a first straight section 34, a bent section 35 and a second straight section 36 connected in sequence, the first straight section 34 and the second straight section 36 are arranged in parallel, the first collecting tube 10 and the second collecting tube 20 are arranged side by side, the end of the first straight section 34 away from the bent section 35 is connected to the first collecting tube 10, and the end of the second straight section 36 away from the bent section 35 is connected to the second collecting tube 20.

[0043] By bending the flat tubes, the heat exchanger forms a double-row structure. Compared with a single-row heat exchanger, the heat exchange area is large, the heat exchange efficiency is high, and this method has a compact structure.

[0044] In this solution, the heat exchanger further includes a plurality of fins 40, which are connected to the plurality of heat exchange tubes 30. The material of the fins 40 is aluminum alloy. A liquid inlet joint 50 is provided at the lower part of the first header 10, and a liquid outlet joint 60 is provided at the upper part of the second header 20. The material of the fins 40 is set to aluminum alloy, which can reduce the cost while ensuring the heat exchange effect. The liquid inlet joint 50 and the liquid outlet joint 60 can be connected to other pipelines, so that the fluid can flow in the heat exchanger.

[0045] like Figure 7 As shown, another embodiment of the utility model provides a fan coil unit, which includes a fan 70 and the above-mentioned heat exchanger. In this solution, the material of the heat exchange tube 30 is aluminum alloy, which can reduce the cost compared with the copper heat exchange tube. Since an anti-corrosion coating is provided on the inner wall of the circulation cavity of the heat exchange tube 30, the corrosion of the aluminum heat exchange tube 30 by water or other heat exchange media in the circulation cavity 31 is avoided or reduced, thereby avoiding the influence of corrosion on the heat exchange performance and service life of the heat exchanger. Therefore, this solution uses aluminum heat exchange tubes to reduce the cost of the fan coil unit, and the heat exchange tubes are not easily corroded, meeting the cost and performance requirements.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

Claims

1. A heat exchanger, characterized in that: The invention comprises a first header (10), a second header (20) and a plurality of heat exchange tubes (30) arranged side by side, one end of each heat exchange tube (30) being connected to the first header (10) and the other end being connected to the second header (20), the material of the heat exchange tube (30) being an aluminum alloy, the heat exchange tube (30) having a flow cavity (31) for fluid flow, and the inner wall of the flow cavity (31) being provided with an anti-corrosion coating.

2. The heat exchanger according to claim 1, characterized in that: The anti-corrosion coating is a plastic spray coating, and the thickness of the plastic spray coating is 85 to 200 μm; or, The anti-corrosion coating is an electrophoretic coating, and the thickness of the electrophoretic coating is 100 to 250 μm; or, The anti-corrosion coating is a TCP coating, and the thickness of the TCP coating is 10 to 100 μm.

3. The heat exchanger according to claim 1, characterized in that: The heat exchange tube (30) is a flat tube having a flow cavity (31). The flow cavity (31) is a single cavity. The cross section of the flow cavity (31) is an oblong hole or an ellipse.

4. The heat exchanger according to claim 1, characterized in that: The heat exchange tube (30) is a flat tube, which includes an outer peripheral plate (32) and a plurality of partitions (33). The area surrounded by the outer peripheral plate (32) forms the flow cavity (31). The plurality of partitions (33) are located in the flow cavity (31) to divide the flow cavity (31) into a plurality of side-by-side sub-cavities. The surfaces of the outer peripheral plate (32) and the partitions (33) are both provided with the anti-corrosion coating.

5. The heat exchanger according to claim 3, characterized in that: The flat tube is formed by bending a whole flat plate, and the anti-corrosion coating is provided on two opposite maximum surfaces of the flat plate before bending.

6. The heat exchanger according to any one of claims 1 to 5, characterized in that: The heat exchange tube (30) is a flat tube, the wall thickness of the flat tube is 0.2 mm to 0.8 mm, the overall thickness of the flat tube is 1 mm to 4 mm, and the distance between two adjacent flat tubes is 5 mm to 15 mm.

7. The heat exchanger according to any one of claims 1 to 5, characterized in that: The first current collecting pipe (10) and the second current collecting pipe (20) are both made of aluminum alloy, and the inner walls of the first current collecting pipe (10) and the second current collecting pipe (20) are provided with an anti-corrosion coating.

8. The heat exchanger according to any one of claims 1 to 5, characterized in that: The heat exchange tube (30) is a flat tube. The heat exchanger further comprises a flat fin (40). The fin (40) comprises a main plate (41) and a plurality of insert plates (42) arranged at intervals in the length direction of the main plate (41). At least part of the insert plates (42) are inserted into the gap between two adjacent flat tubes. The length direction of the fin (40) is perpendicular to the extension direction of the flat tube. There are a plurality of fins (40), and the plurality of fins (40) are distributed at intervals along the extension direction of the flat tube.

9. The heat exchanger according to any one of claims 1 to 5, characterized in that: The heat exchange tube (30) is a flat tube, comprising a first straight section (34), a bent section (35) and a second straight section (36) connected in sequence, the first straight section (34) and the second straight section (36) being arranged in parallel, the first header (10) and the second header (20) being arranged side by side, one end of the first straight section (34) away from the bent section (35) being connected to the first header (10), and one end of the second straight section (36) away from the bent section (35) being connected to the second header (20).

10. The heat exchanger according to claim 1, characterized in that The heat exchanger further comprises a plurality of fins (40), the plurality of fins (40) being cooperatively connected with the plurality of heat exchange tubes (30), the material of the fins (40) being all aluminum alloy, a liquid inlet joint (50) being provided at the lower part of the first header (10), and a liquid outlet joint (60) being provided at the upper part of the second header (20).

11. A fan coil unit, characterized in that: The fan coil unit comprises a fan (70) and the heat exchanger according to any one of claims 1 to 10.

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