Microchannel heat exchanger, air conditioner

Abstract

The present invention provides a microchannel heat exchanger and an air conditioner. The microchannel heat exchanger includes a plurality of arc-shaped flat tubes arranged at intervals and a plurality of heat exchange fins arranged at intervals. The heat exchange fins are configured with a plurality of connection card slots along their length direction that are adapted to the arcs of the arc-shaped flat tubes. The plurality of arc-shaped flat tubes are respectively and correspondingly connected in the plurality of connection card slots. The arc-shaped flat tubes are arranged to be able to unobstructedly guide the air flow on one width side of the heat exchange fins to the other width side of the heat exchange fins. According to the present invention, the contact area between the heat exchange air flow and the arc-shaped flat tubes can be effectively reduced, thereby reducing the air resistance of the microchannel heat exchanger to the heat exchange air flow and enhancing the heat exchange effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and particularly relates to a microchannel heat exchanger and an air conditioner. Background Art

[0002] Currently, the flat tubes of microchannel heat exchangers are usually straight plate type and arranged horizontally. This structure is prone to the problem that condensed water accumulates at the top of the flat tubes, resulting in easy frosting of the condenser. Secondly, when the unit is operating, the fan runs obliquely above the heat exchanger. When the air flow passes through the heat exchanger, the horizontally arranged straight plate type flat tubes will block the air flow, resulting in an increase in wind resistance, affecting the heat exchange effect. Moreover, due to different heat exchange requirements in the upper and lower parts of the heat exchanger, the required air volume and air speed are different, and the horizontally arranged straight plate type flat tubes cannot meet this differential requirement. In addition, the straight plate type flat tubes have poor strength in the vertical direction, which is prone to deformation and distortion of the processed heat exchanger during transportation and production.

[0003] Based on the foregoing deficiencies of the microchannel heat exchanger in the prior art, there has emerged an improvement of the straight plate type microchannel flat tubes into a structure with a certain arc, which can effectively prevent the accumulation of condensed water in the heat exchanger and improve the structural strength of the flat tubes. However, based on the requirement of efficiently discharging condensed water from both the inner and outer sides of the existing circular arc flat tubes, the bending arc of the circular arc flat tubes is relatively large, and a symmetric assembly method is mostly adopted between the circular arc flat tubes and the heat exchange fins, which forms an adverse obstacle to the flow of the heat exchange air flow and cannot take into account the discharge of condensed water and the guidance of the heat exchange air flow. Summary of the Invention

[0004] Therefore, the present invention provides a microchannel heat exchanger and an air conditioner, which can overcome the deficiencies that the bending arc of the circular arc flat tubes in the microchannel heat exchanger in the prior art is relatively large, forms an adverse obstacle to the flow of the heat exchange air flow, and cannot take into account the discharge of condensed water and the guidance of the heat exchange air flow.

[0005] To solve the above problems, the present invention provides a microchannel heat exchanger, including a plurality of arc-shaped flat tubes arranged at intervals and a plurality of heat exchange fins arranged at intervals. The heat exchange fins are constructed with a plurality of connection card slots along their length direction that are adapted to the arcs of the arc-shaped flat tubes. The plurality of arc-shaped flat tubes are respectively connected to the plurality of connection card slots in a one-to-one correspondence, and the arc-shaped flat tubes are arranged to be able to unobstructedly guide the air flow on one width side of the heat exchange fins to the other width side of the heat exchange fins.

[0006] In some embodiments, the central angle corresponding to the arc-shaped flat tubes is between 5° and 30°.

[0007] In some embodiments, the multiple connecting slots on the same heat exchange fin include a first group of connecting slots on a first section in the length direction of the heat exchange fin and a second group of connecting slots on a second section in the length direction of the heat exchange fin, the arc-shaped arched direction of all the connecting slots in the first group of connecting slots is the same, the arc-shaped arched direction of all the connecting slots in the second group of connecting slots is the same and opposite to the arc-shaped arched direction of all the connecting slots in the first group of connecting slots.

[0008] In some embodiments, the connecting slot is an open slot.

[0009] In some embodiments, the heat exchange fin has a connecting portion and a plurality of fin portions connected to one side of the width of the connecting portion, and the open groove is formed between two adjacent fin portions.

[0010] In some embodiments, the wing portion is configured with a plurality of corrugated grooves extending along the length direction of the connecting portion, and / or the connecting portion is configured with a drainage groove extending in a zigzag manner along the length direction thereof.

[0011] In some embodiments, the first ends of the plurality of arc-shaped flat tubes are connected in parallel to the transfer tube, and the second ends of the plurality of arc-shaped flat tubes are connected in parallel to the header assembly.

[0012] In some embodiments, the heat exchange core of the microchannel heat exchanger includes a first core and a second core stacked front and back, the collecting pipe assembly includes a first component connected to the second end of the arc-shaped flat tube corresponding to the first core, and a second component connected to the second end of the arc-shaped flat tube corresponding to the second core, and the first end of the arc-shaped flat tube of the first core and the first end of the arc-shaped flat tube of the second core are connected to the transfer pipe.

[0013] In some embodiments, the arc-shaped flat tube has a heat exchange section, and the first end and the second end of the heat exchange section respectively have an insertion stage, and the insertion stage is inserted into the first installation groove constructed on the collecting main pipe in the collecting pipe assembly or the second installation groove constructed on the transfer pipe.

[0014] The present invention also provides an air conditioner, comprising the above-mentioned microchannel heat exchanger.

[0015] The present invention provides a microchannel heat exchanger and an air conditioner, wherein the arc-shaped flat tubes are arranged in a structural type that does not hinder the airflow, thereby effectively reducing the contact area between the heat exchange airflow and the arc-shaped flat tubes, thereby reducing the wind resistance of the microchannel heat exchanger to the heat exchange airflow and enhancing the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Schematic diagram of the external structure of the microchannel heat exchanger according to an embodiment of the present invention;

[0017] Figure 2 is Figure 1 Cross-sectional view of the arc-shaped flat tube in ;

[0018] Figure 3 is Figure 2 Top view of the arc-shaped flat tube in ;

[0019] Figure 4 is Figure 1 Schematic diagram of the structure of the header assembly in ;

[0020] Figure 5 is Figure 4 Right side view of ;

[0021] Figure 6 is Figure 1 Schematic diagram of the structure of the heat exchange fins in ;

[0022] Figure 7 is Figure 1 Schematic diagram of the guiding effect of the heat exchange fins on the condensed water in ;

[0023] Figure 8 is Figure 1 Schematic diagram of the guiding effect of the heat exchange fins on the heat flow in ;

[0024] Figure 9 is Figure 1 Schematic diagram of the assembled state of the heat exchange fins and the arc-shaped flat tube in ;

[0025] Figure 10 is Figure 1 Another schematic diagram of the heat exchange fins in ;

[0026] Figure 11 is Figure 1 Another schematic diagram of the heat exchange fins in .

[0027] The reference numerals are indicated as:

[0028] 1. Header assembly; 1a. Header main pipe; 1b. Header branch pipe; 1c. First installation groove; 2. Arc-shaped flat tube; 2a. Insertion table stage; 2b. Heat exchange section; 3. Heat exchange fins; 3a. Connection card slot; 3b. Corrugated groove; 3c. Drainage groove; 4. Adapter pipe. Detailed implementation manners

[0029] With reference to Figures 1 to 9As shown, according to an embodiment of the present invention, a microchannel heat exchanger is provided, which includes a plurality of arc-shaped flat tubes 2 arranged at intervals and a plurality of heat exchange fins 3 arranged at intervals. The heat exchange fins 3 are constructed with a plurality of connection card slots 3a adapted to the arcs of the arc-shaped flat tubes 2 along their length directions. A plurality of the arc-shaped flat tubes 2 are respectively and correspondingly connected into the plurality of connection card slots 3a. The arc-shaped flat tubes 2 are arranged to be able to unobstructedly guide the air flow on one width side of the heat exchange fins 3 to the other width side of the heat exchange fins 3, as Figure 9 shown, the length of the arc-shaped flat tubes 2 and the length of the heat exchange fins 3 form a crisscross pattern. In this technical solution, compared with the straight plate-shaped flat tubes in the prior art, the arc-shaped flat tubes 2 have improved structural strength, reduce the deformation and distortion of the flat tubes, and can form a drainage for condensed water to facilitate the discharge of condensed water, thereby reducing the occurrence of frosting phenomenon in the heat exchanger. More importantly, the arc-shaped flat tubes 2 are arranged in a structural form that does not obstruct the air flow, so that the contact area between the heat exchange air flow and the arc-shaped flat tubes 2 can be effectively reduced, thereby reducing the wind resistance of the microchannel heat exchanger to the heat exchange air flow and enhancing the heat exchange effect. It can be understood that the unobstructed guidance is specifically, for example, that the heat exchange air flow enters from one side of the heat exchange core of the heat exchanger and further flows out from the other side of the heat exchange core of the heat exchanger along its flowing direction, and no obstructive wind resistance to the heat exchange air flow will be formed on the outer surface of the arc-shaped flat tubes 2 between the one side and the other side, for example, it can be understood as an inclined straight line extending from one point to another point.

[0030] In some embodiments, the central angle corresponding to the arc-shaped flat tubes 2 is between 5° and 30°, so that while the arc-shaped flat tubes 2 can have the aforementioned structural advantages, the curvature is not too large, so as not to obstruct the flow of the heat exchange air flow. It should be particularly noted that at this time, when the arc-shaped flat tubes 2 arch downward, no condensed water accumulation will be formed either.

[0031] As Figure 6 shown, the arc-shaped arching directions of all the connection card slots 3a on the same heat exchange fin 3 are all unified towards a preset direction to ensure a relatively uniform heat exchange air flow field is formed in the entire heat exchange core of the heat exchanger. In another feasible embodiment, refer to Figure 10 and Figure 11As shown, the multiple connection card slots 3a on the same heat exchange fin 3 include a first group of connection card slots on the first section in the length direction of the heat exchange fin 3 and a second group of connection card slots on the second section in the length direction of the heat exchange fin 3. The arc arching directions of all the connection card slots 3a in the first group of connection card slots are the same, and the arc arching directions of all the connection card slots 3a in the second group of connection card slots are the same and opposite to the arc arching directions of all the connection card slots 3a in the first group of connection card slots. That is, in the length direction of the heat exchange fin 3, the arc-shaped flat tubes 2 have a mixed distribution with upward and downward curvatures, meeting the different requirements of air volume and air field in the upper and lower parts of the heat exchange core of the heat exchanger, and finally ensuring the temperature uniformity of the heat exchanger.

[0032] In some embodiments, the connection card slot 3a is an open slot, which is beneficial to the assembly between the arc-shaped flat tube 2 and the connection card slot 3a.

[0033] See Figure 6 As shown, the heat exchange fin 3 has a connecting portion and a plurality of fin portions connected to one width side of the connecting portion. An open slot is formed between two adjacent fin portions. Further, a plurality of corrugated slots 3b extending along the length direction of the connecting portion are formed on the fin portion, and / or a drain slot 3c extending in a zigzag manner along its length direction is formed on the connecting portion. The position of the corrugated slot 3b is adapted to the assembly position of the arc-shaped flat tube 2, so that the arc-shaped flat tube 2 can cooperate with the corrugated slot 3b to guide condensed water, and finally the condensed water can be discharged from the heat exchanger through the drain slot 3c. The drain slot 3c and the corrugated slot 3b are formed by pressing ribs on the heat exchange fin 3, which can increase the strength of the fin.

[0034] The first ends of the multiple arc-shaped flat tubes 2 are connected in parallel to a transfer pipe 4 (specifically, it can be an aluminum pipe fitting), and the second ends of the multiple arc-shaped flat tubes 2 are connected in parallel to a manifold assembly 1. Specifically, the heat exchange core of the microchannel heat exchanger includes a first core and a second core stacked front and back. The manifold assembly 1 includes a first assembly connected to the second ends of the arc-shaped flat tubes 2 corresponding to the first core and a second assembly connected to the second ends of the arc-shaped flat tubes 2 corresponding to the second core. The first ends of the arc-shaped flat tubes 2 of the first core and the first ends of the arc-shaped flat tubes 2 of the second core are connected to the transfer pipe 4. That is, the transfer pipe 4 realizes the connection of the arc-shaped flat tubes 2 arranged front and back (which can be understood as the inner layer and the outer layer). It can be understood that the first core and the second core are stacked front and back in the flow direction of the heat exchange air flow, and can form a heat exchange gradient, which is beneficial to improving the heat exchange efficiency.

[0035] The header assembly 1 includes a main header 1a and a plurality of branch headers 1b communicating with the main header 1a. In some embodiments, the arc-shaped flat tube 2 has a heat exchange section 2b, and the first end and the second end of the heat exchange section 2b respectively have insertion table stages 2a, and the insertion table stages 2a are inserted into a first installation groove 1c formed on the main header 1a in the header assembly 1 or a second installation groove (not shown and not indexed) formed on the adapter pipe 4.

[0036] According to an embodiment of the present invention, there is also provided an air conditioner, including the above-mentioned microchannel heat exchanger, which can specifically be a U-shaped structure, and a fan is arranged above it, capable of driving air flow to smoothly flow from one side of the heat exchange core to the other side under the guiding action of the arc-shaped flat tube 2.

[0037] It is easily understood by those skilled in the art that, on the premise of no conflict, the above-mentioned advantageous manners can be freely combined and superimposed.

[0038] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A microchannel heat exchanger, characterized in that, it includes a plurality of arc-shaped flat tubes (2) arranged at intervals and a plurality of heat exchange fins (3) arranged at intervals. The heat exchange fins (3) are provided with a plurality of connection card slots (3a) adapted to the arcs of the arc-shaped flat tubes (2) along their length directions. A plurality of the arc-shaped flat tubes (2) are respectively connected to a plurality of the connection card slots (3a) in a one-to-one correspondence. The arc-shaped flat tubes (2) are arranged to be able to unobstructedly guide the air flow on one width side of the heat exchange fins (3) to the other width side of the heat exchange fins (3); a plurality of the connection card slots (3a) on the same heat exchange fin (3) include a first group of connection card slots on the first section in the length direction of the heat exchange fin (3) and a second group of connection card slots on the second section in the length direction of the heat exchange fin (3). All the connection card slots (3a) in the first group of connection card slots have the same arc arching direction, and all the connection card slots (3a) in the second group of connection card slots have the same arc arching direction and are opposite to the arc arching direction of all the connection card slots (3a) in the first group of connection card slots.

2. The microchannel heat exchanger according to claim 1, characterized in that, the central angle corresponding to the arc-shaped flat tube (2) is between 5° and 30°.

3. The microchannel heat exchanger according to claim 1, characterized in that, the connection card slot (3a) is an open slot.

4. The microchannel heat exchanger according to claim 3, characterized in that, the heat exchange fin (3) has a connecting portion and a plurality of fin portions connected to one width side of the connecting portion. An open slot is formed by sandwiching between two adjacent fin portions.

5. The microchannel heat exchanger according to claim 4, characterized in that, a plurality of corrugated slots (3b) extending along the length direction of the connecting portion are formed on the fin portion, and / or a drainage slot (3c) extending in a zigzag manner along its length direction is formed on the connecting portion.

6. The microchannel heat exchanger according to claim 1, characterized in that, the first ends of a plurality of the arc-shaped flat tubes (2) are connected to a transfer pipe (4) in parallel with each other, and the second ends of a plurality of the arc-shaped flat tubes (2) are connected to a header pipe assembly (1) in parallel with each other.

7. The microchannel heat exchanger according to claim 6, characterized in that, the heat exchange core part of the microchannel heat exchanger includes a first core part and a second core part stacked front and back. The header pipe assembly (1) includes a first assembly connected to the second ends of the arc-shaped flat tubes (2) corresponding to the first core part and a second assembly connected to the second ends of the arc-shaped flat tubes (2) corresponding to the second core part. The first ends of the arc-shaped flat tubes (2) of the first core part and the first ends of the arc-shaped flat tubes (2) of the second core part are connected to the transfer pipe (4).

8. The microchannel heat exchanger according to claim 6, characterized in that, The arc-shaped flat tube (2) has a heat exchange section (2b), and the first end and the second end of the heat exchange section (2b) respectively have insertion table stages (2a), and the insertion table stages (2a) are inserted into a first installation groove (1c) formed on a header pipe (1a) in the header pipe assembly (1) or a second installation groove formed on the adapter pipe (4).

9. An air conditioner, characterized in that, it includes the microchannel heat exchanger according to any one of claims 1 to 8.

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