Serpentine tube microchannel heat exchanger, air conditioner

Abstract

The present invention provides a serpentine tube microchannel heat exchanger and an air conditioner. The serpentine tube microchannel heat exchanger includes a first heat dissipation tube group and a second heat dissipation tube group. The first heat dissipation tube group includes M first serpentine tubes connected in parallel, and the second heat dissipation tube group includes N second serpentine tubes connected in parallel. The first refrigerant diversion tube is communicated with the first ports of the M first serpentine tubes through M first branch tubes. The second refrigerant diversion tube and the third refrigerant diversion tube are respectively communicated with the second ports of the M first serpentine tubes and the first ports of the N second serpentine tubes through M second branch tubes and N third branch tubes. The fourth refrigerant diversion tube is communicated with the second ports of the N second serpentine tubes through N fourth branch tubes, and M is not equal to N. According to the present invention, the serpentine tube microchannel heat exchanger can adapt to the flow path conditions of more refrigerant inlets and fewer outlets under the refrigeration condition and fewer inlets and more outlets under the heating condition, improving the comprehensive refrigeration and heating performance of the heat exchanger.

Description

Technical Field

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

[0002] The microchannel heat exchanger has the advantages of high efficiency, compactness, light weight, less filling amount, and easy recycling using all-aluminum materials. Currently, it has been used in single-cooling household microchannel condensers, automotive microchannel condensers and evaporators, and refrigerator condensers.

[0003] As shown in the serpentine tube microchannel heat exchanger Figure 10 The width direction of its flat tube a (i.e., the serpentine tube) is parallel to the axial direction of the header tube b. There are heat dissipation fins c between the flat tubes a. Compared with the traditional microchannel heat exchanger, the diameter of the header tube is smaller, and components such as spacers and adapter blocks are reduced, and the cost of the heat exchanger is lower. Currently, the serpentine tube microchannel heat exchanger is only applicable to the refrigerator occasion, and the cooling capacity range is generally in the hundreds of watts. The flow path adopts a one-in-one-out form. If it is applied to large cooling capacity occasions such as household air conditioners and commercial air conditioners, there are defects of large flow rate and large pressure drop. Therefore, a new serpentine tube flow path form needs to be designed. Summary of the Invention

[0004] Therefore, the present invention provides a serpentine tube microchannel heat exchanger and an air conditioner, which can overcome the deficiencies of large flow rate and large pressure drop when the serpentine tube microchannel heat exchanger with equal numbers of inlet and outlet tubes in the related art is applied to large cooling capacity occasions.

[0005] To solve the above problems, the present invention provides a serpentine tube microchannel heat exchanger, including a first heat dissipation tube group, a second heat dissipation tube group, a first refrigerant diversion tube, a second refrigerant diversion tube, a third refrigerant diversion tube, and a fourth refrigerant diversion tube. The first heat dissipation tube group includes M first serpentine tubes connected in parallel, and the second heat dissipation tube group includes N second serpentine tubes connected in parallel. The first refrigerant diversion tube has M first branch tubes, and the M first branch tubes are respectively and correspondingly connected to the first ports of the M first serpentine tubes. The second refrigerant diversion tube has M second branch tubes, and the M second branch tubes are respectively and correspondingly connected to the second ports of the M first serpentine tubes. The third refrigerant diversion tube has N third branch tubes, and the N third branch tubes are respectively and correspondingly connected to the first ports of the N second serpentine tubes. The fourth refrigerant diversion tube has N fourth branch tubes, and the N fourth branch tubes are respectively and correspondingly connected to the second ports of the N second serpentine tubes, and M is not equal to N.

[0006] In some embodiments, M is greater than N. When the air conditioner is in the cooling mode, the first refrigerant diversion pipe is connected to the exhaust port of the compressor, and the fourth refrigerant diversion pipe is connected to the suction port of the compressor; when the air conditioner is in the heating mode, the first refrigerant diversion pipe is connected to the suction port of the compressor, and the fourth refrigerant diversion pipe is connected to the exhaust port of the compressor.

[0007] In some embodiments, there is a throttling component between the second refrigerant diversion pipe and the third refrigerant diversion pipe, and the second refrigerant diversion pipe and the third refrigerant diversion pipe are communicated through the throttling component.

[0008] In some embodiments, the throttling component is a spacer with a first throttling hole. The second refrigerant diversion pipe and the third refrigerant diversion pipe are integrally formed straight pipes, and the spacer is connected inside the straight pipes.

[0009] In some embodiments, the straight pipes are on the air inlet side of the serpentine tube microchannel heat exchanger, and the first refrigerant diversion pipe and the fourth refrigerant diversion pipe are on the air outlet side of the serpentine tube microchannel heat exchanger.

[0010] In some embodiments, the throttling component is a jet pipe with a second throttling hole. One end of the jet pipe is a closed end, and the other end is an open end. The closed end and the second throttling hole are inside the second refrigerant diversion pipe, and the open end is inside the fourth refrigerant diversion pipe.

[0011] In some embodiments, the first refrigerant diversion pipe and the fourth refrigerant diversion pipe are on the air outlet side of the serpentine tube microchannel heat exchanger, and the second refrigerant diversion pipe and the third refrigerant diversion pipe are on the air inlet side of the serpentine tube microchannel heat exchanger.

[0012] In some embodiments, the first serpentine tube is formed by connecting in series a first outer serpentine tube on the air inlet side of the serpentine tube microchannel heat exchanger and a first inner serpentine tube on the air outlet side of the serpentine tube microchannel heat exchanger. The first port of the first outer serpentine tube and the first port of the first inner serpentine tube are communicated through a first connecting pipe.

[0013] In some embodiments, the second serpentine tube is formed by connecting in series a second outer serpentine tube on the air inlet side of the serpentine tube microchannel heat exchanger and a second inner serpentine tube on the air outlet side of the serpentine tube microchannel heat exchanger. The first port of the second outer serpentine tube and the first port of the second inner serpentine tube are communicated through a second connecting pipe.

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

[0015] A serpentine tube microchannel heat exchanger and an air conditioner provided by the present invention. The first refrigerant diversion tube and the fourth refrigerant diversion tube respectively have different numbers of branch pipes, enabling the serpentine tube microchannel heat exchanger to adapt to the flow path conditions of more refrigerant in and less out under the refrigeration condition and less refrigerant in and more out under the heating condition, improving the comprehensive refrigeration and heating performance of the heat exchanger. At the same time, under the refrigeration condition, the second heat dissipation tube group subcools the refrigerant after heat exchange by the first heat dissipation tube group, and the second serpentine tubes in the second heat dissipation tube group are connected in parallel, which can solve the problem of large pressure drop in series in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of a serpentine tube microchannel heat exchanger according to an embodiment of the present invention;

[0017] Figure 2 is Figure 1 a schematic diagram of the refrigerant flow direction of the serpentine tube microchannel heat exchanger in FIG. under the refrigeration condition of the air conditioner;

[0018] Figure 3 is Figure 1 a schematic diagram of the refrigerant flow direction of the serpentine tube microchannel heat exchanger in FIG. under the heating condition of the air conditioner;

[0019] Figure 4 FIG. is a schematic structural diagram of a serpentine tube microchannel heat exchanger according to another embodiment of the present invention;

[0020] Figure 5 FIG. is a schematic structural diagram of a throttling component according to an embodiment of the present invention;

[0021] Figure 6 FIG. is a schematic structural diagram of a serpentine tube microchannel heat exchanger according to still another embodiment of the present invention;

[0022] Figure 7 FIG. is another schematic structural diagram of a throttling component according to an embodiment of the present invention;

[0023] Figure 8 is Figure 7 a schematic diagram of the refrigerant flow direction of the serpentine tube microchannel heat exchanger in FIG. under the refrigeration condition of the air conditioner;

[0024] Figure 9 is Figure 7 a schematic diagram of the refrigerant flow direction of the serpentine tube microchannel heat exchanger in FIG. under the heating condition of the air conditioner;

[0025] Figure 10 FIG. is a schematic structural diagram of a one-in-one-out serpentine tube microchannel heat exchanger in the prior art.

[0026] The reference numerals are shown as:

[0027] 1. First heat dissipation tube group; 11. First serpentine tube; 111. First outer serpentine tube; 112. First inner serpentine tube; 113. First connecting tube; 2. Second heat dissipation tube group; 21. Second serpentine tube; 211. Second outer serpentine tube; 212. Second inner serpentine tube; 213. Second connecting tube; 3. First refrigerant diversion tube; 31. First branch tube; 4. Second refrigerant diversion tube; 41. Second branch tube; 5. Third refrigerant diversion tube; 51. Third branch tube; 6. Fourth refrigerant diversion tube; 61. Fourth branch tube; 7. Injection tube; 71. Second throttle orifice; 8. Spacer; 81. First throttle orifice. Detailed implementation manner

[0028] Refer to in combination Figures 1 to 10As shown, according to an embodiment of the present invention, a serpentine tube microchannel heat exchanger is provided, which includes a first heat dissipation tube group 1, a second heat dissipation tube group 2, a first refrigerant diversion tube 3, a second refrigerant diversion tube 4, a third refrigerant diversion tube 5, and a fourth refrigerant diversion tube 6. The first heat dissipation tube group 1 includes M first serpentine tubes 11 connected in parallel, and the second heat dissipation tube group 2 includes N second serpentine tubes 21 connected in parallel. The first refrigerant diversion tube 3 has M first branch tubes 31, and the M first branch tubes 31 are respectively and correspondingly connected to the first ports of the M first serpentine tubes 11. The second refrigerant diversion tube 4 has M second branch tubes 41, and the M second branch tubes 41 are respectively and correspondingly connected to the second ports of the M first serpentine tubes 11. The third refrigerant diversion tube 5 has N third branch tubes 51, and the N third branch tubes 51 are respectively and correspondingly connected to the first ports of the N second serpentine tubes 21. The fourth refrigerant diversion tube 6 has N fourth branch tubes 61, and the N fourth branch tubes 61 are respectively and correspondingly connected to the second ports of the N second serpentine tubes 21. M and N are not equal. It can be understood that heat dissipation fins (not shown in the figure) are provided on both the first serpentine tube 11 and the second serpentine tube 21 to improve the heat dissipation effect of the heat exchanger. In this technical solution, the first refrigerant diversion tube 3 and the fourth refrigerant diversion tube 6 respectively have different numbers of branch tubes, enabling the serpentine tube microchannel heat exchanger to adapt to the flow path conditions of more refrigerant in and less out in the refrigeration condition and less in and more out in the heating condition, improving the comprehensive refrigeration and heating performance of the heat exchanger. Specifically, when the air conditioner is in the refrigeration state, the refrigerant inlet of the heat exchanger is in the gas phase and the outlet is in the liquid phase. Considering from the perspectives of the balanced heat transfer coefficient and pressure drop, the gas phase has a large pressure drop and requires more branch paths, while the liquid phase has a small pressure drop and requires fewer branch paths to increase the heat transfer coefficient; in heating, it is the opposite. The inlet is in the gas-liquid two-phase state and requires fewer branch paths to increase the heat transfer coefficient, and the outlet is in the gas phase and requires more branch paths to reduce the pressure drop. At the same time, in the refrigeration condition, the second heat dissipation tube group 2 subcools the refrigerant after heat exchange by the first heat dissipation tube group 1, and the second serpentine tubes 21 in the second heat dissipation tube group 2 are connected in parallel, which can solve the problem of large pressure drop in series in the related art.

[0029] Specifically, M is greater than N. When the air conditioner is in the refrigeration condition, the first refrigerant diversion tube 3 is connected to the exhaust port of the compressor, and the fourth refrigerant diversion tube 6 is connected to the suction port of the compressor; when the air conditioner is in the heating condition, the first refrigerant diversion tube 3 is connected to the suction port of the compressor, and the fourth refrigerant diversion tube 6 is connected to the exhaust port of the compressor. For example Figure 1 in the heat exchanger in Figure 4 and Figure 6 in the heat exchanger in

[0030] In some embodiments, there is a throttling component between the second refrigerant drainage pipe 4 and the third refrigerant drainage pipe 5. The second refrigerant drainage pipe 4 and the third refrigerant drainage pipe 5 are connected through the throttling component to throttle and accelerate the passing refrigerant. Specifically, in the heating condition, the liquid refrigerant introduced successively by the fourth refrigerant drainage pipe 6 and the third refrigerant drainage pipe 5 can be accelerated, so as to ensure that the refrigerant can reach the end of the second refrigerant drainage pipe 4, and the refrigerant is fully filled and evenly distributed.

[0031] As a specific implementation manner of the throttling component, the throttling component is a separator 8 having a first throttling hole 81. The second refrigerant drainage pipe 4 and the third refrigerant drainage pipe 5 are integrally formed straight pipes. The separator 8 is connected inside the straight pipe. At this time, correspondingly, the straight pipe is on the air inlet side of the serpentine microchannel heat exchanger, and the first refrigerant drainage pipe 3 and the fourth refrigerant drainage pipe 6 are on the air outlet side of the serpentine microchannel heat exchanger.

[0032] As another specific implementation manner of the throttling component, the throttling component is a jet pipe 7 having a second throttling hole 71. One end of the jet pipe 7 is a closed end, and one end of the jet pipe 7 is an open end. The closed end and the second throttling hole 71 are inside the second refrigerant drainage pipe 4 (that is, the closed end of the jet pipe 7 is embedded inside the second refrigerant drainage pipe 4), and the open end is inside the fourth refrigerant drainage pipe 6, so that the first refrigerant drainage pipe 3 and the fourth refrigerant drainage pipe 6 can be on the air outlet side of the serpentine microchannel heat exchanger, and the second refrigerant drainage pipe 4 and the third refrigerant drainage pipe 5 are on the air inlet side of the serpentine microchannel heat exchanger.

[0033] In some embodiments, the first serpentine tube 11 is formed by connecting in series a first outer serpentine tube 111 on the air inlet side of the serpentine tube microchannel heat exchanger and a first inner serpentine tube 112 on the air outlet side of the serpentine tube microchannel heat exchanger. A first port of the first outer serpentine tube 111 is communicated with a first port of the first inner serpentine tube 112 through a first connecting tube 113. A second port of the first outer serpentine tube 111 is communicated with the second refrigerant drainage tube 4. A second port of the first inner serpentine tube 112 is communicated with the first refrigerant drainage tube 3. Alternatively, the second serpentine tube 21 is formed by connecting in series a second outer serpentine tube 211 on the air inlet side of the serpentine tube microchannel heat exchanger and a second inner serpentine tube 212 on the air outlet side of the serpentine tube microchannel heat exchanger. A first port of the second outer serpentine tube 211 is communicated with a first port of the second inner serpentine tube 212 through a second connecting tube 213. A second port of the second outer serpentine tube 211 is communicated with one of the third refrigerant drainage tube 5 and the fourth refrigerant drainage tube 6. A second port of the second inner serpentine tube 212 is communicated with the other of the third refrigerant drainage tube 5 and the fourth refrigerant drainage tube 6. In this technical solution, the first heat dissipation tube group 1 and the second heat dissipation tube group 2 are respectively composed of an outer serpentine tube and an inner serpentine tube (i.e., a double-layer serpentine tube structure). The inner and outer serpentine tubes are connected in series through the first connecting tube 113 or the second connecting tube 213. When both the first refrigerant drainage tube 3 and the fourth refrigerant drainage tube 6 are on the same side of the heat exchanger, such as the air outlet side, during the refrigeration operation, the flow direction of the refrigerant in the second heat dissipation tube group 2 and the flow direction of the air are in the same direction, and the heat exchange temperature difference is relatively small, improving the heat exchange effect. When the first refrigerant drainage tube 3 and the fourth refrigerant drainage tube 6 are on both sides of the heat exchanger, during the refrigeration operation, the flow direction of the refrigerant in the second heat dissipation tube group 2 and the flow direction of the air are in the opposite direction, and the heat exchange temperature difference is relatively large, and the heat exchange effect is better.

[0034] According to an embodiment of the present invention, there is also provided an air conditioner including the above-mentioned serpentine tube microchannel heat exchanger.

[0035] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous manners can be freely combined and superimposed.

[0036] 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 embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A serpentine tube microchannel heat exchanger, characterized in that, it includes a first heat dissipation tube group (1), a second heat dissipation tube group (2), a first refrigerant diversion tube (3), a second refrigerant diversion tube (4), a third refrigerant diversion tube (5), and a fourth refrigerant diversion tube (6). The first heat dissipation tube group (1) includes M parallel-connected first serpentine tubes (11), the second heat dissipation tube group (2) includes N parallel-connected second serpentine tubes (21), the first refrigerant diversion tube (3) has M first branch tubes (31), and the M first branch tubes (31) are respectively and correspondingly connected to the first ports of the M first serpentine tubes (11). The second refrigerant diversion tube (4) has M second branch tubes (41), and the M second branch tubes (41) are respectively and correspondingly connected to the second ports of the M first serpentine tubes (11). The third refrigerant diversion tube (5) has N third branch tubes (51), and the N third branch tubes (51) are respectively and correspondingly connected to the first ports of the N second serpentine tubes (21). The fourth refrigerant diversion tube (6) has N fourth branch tubes (61), and the N fourth branch tubes (61) are respectively and correspondingly connected to the second ports of the N second serpentine tubes (21), and M is not equal to N.

2. The serpentine tube microchannel heat exchanger according to claim 1, characterized in that, M is greater than N, and when the air conditioner is in the refrigeration mode, the first refrigerant diversion tube (3) is connected to the exhaust port of the compressor, and the fourth refrigerant diversion tube (6) is connected to the suction port of the compressor; when the air conditioner is in the heating mode, the first refrigerant diversion tube (3) is connected to the suction port of the compressor, and the fourth refrigerant diversion tube (6) is connected to the exhaust port of the compressor.

3. The serpentine tube microchannel heat exchanger according to claim 1 or 2, characterized in that, a throttling component is provided between the second refrigerant diversion tube (4) and the third refrigerant diversion tube (5), and the second refrigerant diversion tube (4) and the third refrigerant diversion tube (5) are connected through the throttling component.

4. The serpentine tube microchannel heat exchanger according to claim 3, characterized in that, the throttling component is a separator (8) having a first throttling hole (81), the second refrigerant diversion tube (4) and the third refrigerant diversion tube (5) are integrally formed straight tubes, and the separator (8) is connected inside the straight tubes.

5. The serpentine tube microchannel heat exchanger according to claim 4, characterized in that, the straight tubes are on the air inlet side of the serpentine tube microchannel heat exchanger, and the first refrigerant diversion tube (3) and the fourth refrigerant diversion tube (6) are on the air outlet side of the serpentine tube microchannel heat exchanger.

6. The serpentine tube microchannel heat exchanger according to claim 3, characterized in that, The throttling component is an injection pipe (7) having a second throttling orifice (71). One end of the injection pipe (7) is a closed end, and the other end of the injection pipe (7) is an open end. The closed end and the second throttling orifice (71) are located inside the second refrigerant drainage pipe (4), and the open end is located inside the fourth refrigerant drainage pipe (6).

7. The serpentine tube microchannel heat exchanger according to claim 6, wherein, the first refrigerant drainage pipe (3) and the fourth refrigerant drainage pipe (6) are located on the air outlet side of the serpentine tube microchannel heat exchanger, and the second refrigerant drainage pipe (4) and the third refrigerant drainage pipe (5) are located on the air inlet side of the serpentine tube microchannel heat exchanger.

8. The serpentine tube microchannel heat exchanger according to any one of claims 1, 6, and 7, wherein, the first serpentine tube (11) is formed by connecting in series a first outer serpentine tube (111) located on the air inlet side of the serpentine tube microchannel heat exchanger and a first inner serpentine tube (112) located on the air outlet side of the serpentine tube microchannel heat exchanger. The first port of the first outer serpentine tube (111) is communicated with the first port of the first inner serpentine tube (112) through a first connecting pipe (113).

9. The serpentine tube microchannel heat exchanger according to claim 8, wherein, the second serpentine tube (21) is formed by connecting in series a second outer serpentine tube (211) located on the air inlet side of the serpentine tube microchannel heat exchanger and a second inner serpentine tube (212) located on the air outlet side of the serpentine tube microchannel heat exchanger. The first port of the second outer serpentine tube (211) is communicated with the first port of the second inner serpentine tube (212) through a second connecting pipe (213).

10. An air conditioner, wherein, it includes the serpentine tube microchannel heat exchanger according to any one of claims 1 to 9.

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