Microchannel heat exchanger and air conditioner

Abstract

A coiled tube type microchannel heat exchanger and an air conditioner, the coiled tube type microchannel heat exchanger includes a first heat radiation pipe group (1) and a second heat radiation pipe group (2), the first heat radiation pipe group (1) includes M first coiled tubes (11) arranged in parallel, the second heat radiation pipe group (2) includes N second coiled tubes (21) arranged in parallel, and a first refrigerant flow guide pipe (3) is connected to first ends of the M first coiled tubes (11) by M first branch pipes (31). the second refrigerant flow guide tube (4) and the third refrigerant flow guide tube (5) respectively communicate with the second end openings of the M first coils (11) and the first end openings of the N second coils (21) through M second branch pipes (41) and N third branch pipes (51), and the fourth refrigerant flow guide tube (6) communicates with the second end openings of the N second coils (21) through N fourth branch pipes (61), where M and N are not equal. The coil-type microchannel heat exchanger is adapted to a flow path mode in which a large amount of refrigerant enters and a small amount of refrigerant exits in a cooling operation mode and a small amount of refrigerant enters and a large amount of refrigerant exits in a heating operation mode, thereby improving the overall cooling and heating performance of the heat exchanger.

Description

[Technical field]

[0001] This disclosure claims priority to a Chinese patent application with application number 202111582471.4, entitled "Coiled Tube Microchannel Heat Exchanger and Air Conditioner," filed with the China Patent Office on December 22, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of heat exchanger manufacturing technology, and in particular to a coiled microchannel heat exchanger and an air conditioner. [Background technology]

[0003] Microchannel heat exchangers have the advantages of being highly efficient, compact, light in weight, requiring little input, and being made entirely of aluminum, making them easy to recycle. They are currently used in domestic microchannel condensers for air conditioning, automotive microchannel condensers and evaporators, and refrigerator condensers.

[0004] As shown in Fig. 10, the width direction of the flat tube a (i.e., the coil) of the coiled microchannel heat exchanger is parallel to the axial direction of the junction tube b, and there are heat dissipation fins c between the flat tubes a, and the diameter of the junction tube is smaller than that of the traditional microchannel heat exchanger, and the number of components such as separators and relay blocks is reduced, resulting in a lower cost of the heat exchanger. Currently, the coiled microchannel heat exchanger is only applied to refrigerators, where the cooling capacity is generally in the range of 100 watts, and the flow paths are all in the form of one inlet and one outlet, so when the cooling capacity is large, for example, when applied to a home air conditioner or a commercial air conditioner, there is a defect that the flow rate is large and the pressure drop is large, and therefore a new type of coiled flow path needs to be designed. Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the present disclosure provides a coiled microchannel heat exchanger and an air conditioner that can solve the problem of high flow rate and large pressure drop when a coiled microchannel heat exchanger having the same number of inlet and outlet pipes in the related art is applied to a large cooling amount. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure provides a coiled microchannel heat exchanger, which includes a first heat radiation tube group, a second heat radiation tube group, a first refrigerant flow guide tube, a second refrigerant flow guide tube, a third refrigerant flow guide tube and a fourth refrigerant flow guide tube, the first heat radiation tube group includes M first coiled tubes arranged in parallel, the second heat radiation tube group includes N second coiled tubes arranged in parallel, the first refrigerant flow guide tube has M first branch tubes, the M first branch tubes correspond one-to-one to each other and communicate with first end openings of the M first coiled tubes, and the second refrigerant flow guide tube has M second branch tubes, The M second branch pipes are connected to the second end openings of the M first coils in a one-to-one correspondence, the third refrigerant flow guide pipe has N third branch pipes, and the N third branch pipes are connected to the first end openings of the N second coils in a one-to-one correspondence, the fourth refrigerant flow guide pipe has N fourth branch pipes, and the N fourth branch pipes are connected to the second end openings of the N second coils in a one-to-one correspondence, where M and N are not equal.

[0007] In some embodiments, M is greater than N and when the air conditioner is in a cooling mode of operation, the first refrigerant flow guide tube is connected to the compressor outlet and the fourth refrigerant flow guide tube is connected to the compressor inlet, and when the air conditioner is in a heating mode of operation, the first refrigerant flow guide tube is connected to the compressor inlet and the fourth refrigerant flow guide tube is connected to the compressor outlet.

[0008] In some embodiments, a throttling member is provided between the second refrigerant flow guide tube and the third refrigerant flow guide tube, and the second refrigerant flow guide tube and the third refrigerant flow guide tube communicate with each other through the throttling member.

[0009] In some embodiments, the throttling member is a separator having a first throttling hole, the second refrigerant flow guide tube and the third refrigerant flow guide tube are integrally molded straight tubes, and the separator is connected within the straight tubes.

[0010] In some embodiments, the straight tube is located on an intake side of the serpentine microchannel heat exchanger, and the first refrigerant flow guide tube and the fourth refrigerant flow guide tube are located on an exhaust side of the serpentine microchannel heat exchanger.

[0011] In some embodiments, the throttling member is a jet tube having a second throttling hole, one end of the jet tube is a closed end and the other end of the jet tube is an open end, the closed end and the second throttling hole are located in the second refrigerant flow guide tube, and the open end is located in the fourth refrigerant flow guide tube.

[0012] In some embodiments, the first refrigerant flow guide tube and the fourth refrigerant flow guide tube are located on an exhaust side of the serpentine microchannel heat exchanger, and the second refrigerant flow guide tube and the third refrigerant flow guide tube are located on an intake side of the serpentine microchannel heat exchanger.

[0013] In some embodiments, the first serpentine includes a first outer serpentine located on the intake side of the serpentine microchannel heat exchanger and a first inner serpentine located on the exhaust side of the serpentine microchannel heat exchanger, the first outer serpentine and the first inner serpentine are in series, and a first end opening of the first outer serpentine and a first end opening of the first inner serpentine are connected by a first connecting tube.

[0014] In some embodiments, the second serpentine comprises a second outer serpentine located on the intake side of the serpentine microchannel heat exchanger and a second outer serpentine located on the intake side of the serpentine microchannel heat exchanger.Exhaust side of the second outer corrugated tube and the second inner corrugated tube are connected in series, and a first end opening of the second outer corrugated tube and a first end opening of the second inner corrugated tube are connected by a second connecting tube.

[0015] The present disclosure further provides an air conditioner including the above-described serpentine microchannel heat exchanger.

[0016] According to the coiled tube type microchannel heat exchanger and air conditioner provided by the present disclosure, the first refrigerant flow guide tube and the fourth refrigerant flow guide tube each have a different number of branch tubes, and the coiled tube type microchannel heat exchanger can adapt to a flow path mode in which a large amount of refrigerant flows in and out in a cooling operation mode and a small amount of refrigerant flows in and out in a heating operation mode, thereby improving the overall cooling and heating performance of the heat exchanger. Also, in the cooling operation mode, the second heat dissipation tube group realizes supercooling of the refrigerant heat-exchanged in the first heat dissipation tube group, and the second coiled tubes in the second heat dissipation tube group are connected in parallel to each other, thereby solving the problem of large pressure drop caused by the use of series in the related art. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a structural schematic diagram of a coiled microchannel heat exchanger according to an embodiment of the present disclosure. [Diagram 2] 2 is a schematic diagram showing the flow direction of a refrigerant when the coiled tube type microchannel heat exchanger in FIG. 1 is in a cooling operation mode of an air conditioner. FIG. [Diagram 3] 2 is a schematic diagram showing the flow direction of a refrigerant when the coiled tube type microchannel heat exchanger in FIG. 1 is in a heating operation mode of an air conditioner. FIG. [Figure 4] FIG. 2 is a structural schematic diagram of a coiled microchannel heat exchanger according to another embodiment of the present disclosure. [Diagram 5] FIG. 2 is a schematic diagram of a structure of a throttle member in an embodiment of the present disclosure. [Figure 6] FIG. 2 is a structural schematic diagram of a coiled microchannel heat exchanger according to another embodiment of the present disclosure. [Figure 7]11A and 11B are schematic diagrams illustrating another structure of the throttle member in the embodiment of the present disclosure. [Figure 8] 8 is a schematic diagram showing the flow direction of the refrigerant when the coiled tube type microchannel heat exchanger in FIG. 7 is in a cooling operation mode of an air conditioner. FIG. [Figure 9] 8 is a schematic diagram showing the flow direction of the refrigerant when the coiled tube type microchannel heat exchanger in FIG. 7 is in a heating operation mode of an air conditioner. FIG. [Figure 10] FIG. 2 is a structural schematic diagram of a one-inlet, one-outlet coil-type microchannel heat exchanger in the related art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Figures 1 to 9 As shown in FIG. 1, according to an embodiment of the present disclosure, a coiled micro-channel heat exchanger is provided, the coiled micro-channel heat exchanger includes a first heat dissipation tube group 1, a second heat dissipation tube group 2, a first refrigerant flow guide tube 3, a second refrigerant flow guide tube 4, a third refrigerant flow guide tube 5 and a fourth refrigerant flow guide tube 6, the first heat dissipation tube group 1 includes M first coiled tubes 11 arranged in parallel, the second heat dissipation tube group 2 includes N second coiled tubes 21 arranged in parallel, the first refrigerant flow guide tube 3 has M first branched tubes 31, the M first branched tubes 31 are connected to first end openings of the M first coiled tubes 11 in a one-to-one correspondence, and the second refrigerant flow guide tube 4 has M second branched tubes 41, The M second branch pipes 41 are connected to the second end openings of the M first coils 11 in a one-to-one correspondence, the third refrigerant flow guide pipe 5 has N third branch pipes 51, and the N third branch pipes 51 are connected to the first end openings of the N second coils 21 in a one-to-one correspondence, the fourth refrigerant flow guide pipe 6 has N fourth branch pipes 61, and the N fourth branch pipes 61 are connected to the second end openings of the N second coils 21 in a one-to-one correspondence, where M and N are not equal. In some embodimentsThe first coil 11 and the second coil 21 are both provided with heat dissipation fins (not shown), thereby improving the heat dissipation effect of the heat exchanger. In this technical solution, the first refrigerant flow guide tube 3 and the fourth refrigerant flow guide tube 6 each have a different number of branch tubes, so that the coil-type microchannel heat exchanger can adapt to a flow path mode in which a large amount of refrigerant enters and exits in a cooling operation mode and a small amount of refrigerant enters and exits in a heating operation mode, thereby improving the overall cooling and heating performance of the heat exchanger. Specifically, when the air conditioner is in the cooling operation mode, the refrigerant inlet of the heat exchanger is in the gas phase and the outlet is in the liquid phase. From the viewpoint of balancing the heat transfer coefficient and the pressure drop, the pressure drop of the gas phase is large, so that the number of branch paths required is large in order to improve the heat transfer coefficient, and the pressure drop of the liquid phase is small, so that the number of branch paths required is small. In the heating operation mode, the opposite is true, the inlet is in both gas and liquid phases, so that the number of branch paths required is small in order to improve the heat transfer coefficient, and the outlet is in the gas phase, so that the number of branch paths required is large in order to reduce the pressure drop. In addition, in the cooling operation mode, the second heat dissipation pipe group 2 supercools the refrigerant that has been heat exchanged in the first heat dissipation pipe group 1, and by adopting a parallel connection between each of the second serpentine tubes 21 in the second heat dissipation pipe group 2, the problem of large pressure drop caused by the adoption of a series connection in the related art can be solved.

[0019] Specifically, M is greater than N, and when the air conditioner is in cooling operation mode, the first refrigerant flow guide tube 3 is connected to the compressor exhaust port, and the fourth refrigerant flow guide tube 6 is connected to the compressor intake port; when the air conditioner is in heating operation mode, the first refrigerant flow guide tube 3 is connected to the compressor intake port, and the fourth refrigerant flow guide tube 6 is connected to the compressor exhaust port. For example, in the heat exchanger in FIG. 1, M=7, and N=3; and in the heat exchangers in FIG. 4 and FIG. 6, M=4, and N=3.

[0020] In some embodiments, a throttle member is provided between the second refrigerant flow guide tube 4 and the third refrigerant flow guide tube 5, and the second refrigerant flow guide tube 4 and the third refrigerant flow guide tube 5 are connected by the throttle member, so that the passing refrigerant can be throttled and accelerated. Specifically, in the heating operation mode, the liquid refrigerant taken in succession from the fourth refrigerant flow guide tube 6 and the third refrigerant flow guide tube 5 is accelerated to ensure that the refrigerant can reach the end of the second refrigerant flow guide tube 4, and the refrigerant is fully filled and evenly divided.

[0021] As a specific embodiment of the throttling member, the throttling member is a separator 8 having a first throttling hole 81, the second refrigerant flow guide tube 4 and the third refrigerant flow guide tube 5 are integrally molded straight tubes, and the separator 8 is connected into the straight tubes, whereby the straight tubes are correspondingly located at the intake side of the serpentine micro-channel heat exchanger, and the first refrigerant flow guide tube 3 and the fourth refrigerant flow guide tube 6 are located at the exhaust side of the serpentine micro-channel heat exchanger.

[0022] As another specific embodiment of the throttle member, the throttle member is an injection pipe 7 having a second throttle hole 71, one end of the injection pipe 7 is a closed end, and others The end of the injection tube 7 is an open end, and the closed end and the second throttling hole 71 are located within the second refrigerant flow guide tube 4 (i.e., the closed end of the injection tube 7 is fitted within the second refrigerant flow guide tube 4), and the open end is located within the fourth refrigerant flow guide tube 6, so that the first refrigerant flow guide tube 3 and the fourth refrigerant flow guide tube 6 are located on the exhaust side of the serpentine micro-channel heat exchanger, and the second refrigerant flow guide tube 4 and the third refrigerant flow guide tube 5 are located on the suction side of the serpentine micro-channel heat exchanger.

[0023] In some embodiments, the first serpentine 11 includes a first outer serpentine 111 located on the intake side of the serpentine microchannel heat exchanger and a first inner serpentine 112 located on the exhaust side of the serpentine microchannel heat exchanger, the first outer serpentine 111 and the first inner serpentine 112 are connected in series, a first end opening of the first outer serpentine 111 and a first end opening of the first inner serpentine 112 are connected by a first connecting tube 113, a second end opening of the first outer serpentine 111 and the second refrigerant flow guide tube 4, and a second end opening of the first inner serpentine 112 are connected to the first refrigerant flow guide tube 3. In some embodiments The second coil 21 includes a second outer coil 211 located on the intake side of the coil microchannel heat exchanger and a second outer coil 212 located on the intake side of the coil microchannel heat exchanger. Exhaust side of the second outer serpentine tube 211 and the second inner serpentine tube 212 are connected in series, a first end opening of the second outer serpentine tube 211 and a first end opening of the second inner serpentine tube 212 are connected by a second connecting tube 213, a second end opening of the second outer serpentine tube 211 is connected to one of the third refrigerant flow guide tube 5 and the fourth refrigerant flow guide tube 6, and a second end opening of the second inner serpentine tube 212 is connected to the other of the third refrigerant flow guide tube 5 and the fourth refrigerant flow guide tube 6. In this technical solution, the first heat radiation pipe group 1 and the second heat radiation pipe group 2 are respectively composed of an outer coil and an inner coil (i.e., a double coil structure), and the inner and outer coils are connected in series by the first connecting pipe 113 or the second connecting pipe 213. When the first refrigerant flow guide pipe 3 and the fourth refrigerant flow guide pipe 6 are located on the same side of the heat exchanger, for example, the exhaust side, the refrigerant flow direction and the wind flow direction in the second heat radiation pipe group 2 are forward flow during cooling operation, and the temperature difference in heat exchange is relatively small, improving the heat exchange effect. When the first refrigerant flow guide pipe 3 and the fourth refrigerant flow guide pipe 6 are located on both sides of the heat exchanger, respectively, the refrigerant flow direction and the wind flow direction in the second heat radiation pipe group 2 are reverse flow during cooling operation, and the temperature difference in heat exchange is relatively large, improving the heat exchange effect.

[0024] According to an embodiment of the present disclosure, there is further provided an air conditioner, including the above-described serpentine microchannel heat exchanger.

[0025] As will be readily understood by those skilled in the art, the above-mentioned advantageous aspects can be freely combined and superimposed on the premise that there is no contradiction.

[0026] The above is only a preferred embodiment of the present disclosure, and does not limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure should all be included in the scope of protection of the present disclosure. The above is only a preferred embodiment of the present disclosure, and those skilled in the art can make some improvements and modifications without departing from the technical principles of the present disclosure, and these improvements and modifications should also be considered as part of the scope of protection of the present disclosure. [Explanation of symbols]

[0027] 1 1st heat dissipation tube group 11 1st snake pipe 111 1st outer serpentine pipe 112 1st inner spiral pipe 113 First connecting pipe 2 2nd heat dissipation tube group 21 2nd snake pipe 211 2nd outer serpentine pipe 212 2nd inner spiral pipe 213 Second connecting pipe 3 First refrigerant flow guide tube 31 First Branch Pipe 4 Second refrigerant flow guide tube 41 Second branch pipe 5. Third refrigerant flow guide tube 51 Third branch pipe 6 Fourth refrigerant flow guide tube 61 4th branch pipe 7 Injection tube 71 Second throttle hole 8 Separator 81 First aperture

Claims

1. A coiled microchannel heat exchanger comprising: The system includes a first heat radiation tube group (1), a second heat radiation tube group (2), a first refrigerant flow guide tube (3), a second refrigerant flow guide tube (4), a third refrigerant flow guide tube (5) and a fourth refrigerant flow guide tube (6), The first heat radiation pipe group (1) includes M first coils (11) arranged in parallel, the second heat radiation pipe group (2) includes N second coils (21) arranged in parallel, the first refrigerant flow guide pipe (3) has M first branch pipes (31), and the M first branch pipes (31) are in one-to-one correspondence with each other and communicate with first end openings of the M first coils (11), the second refrigerant flow guide pipe (4) has M second branch pipes (41), and the M second branch pipes (41) are in one-to-one correspondence with each other and communicate with first end openings of the M first coils (11), the third refrigerant flow guide tube (5) has N third branch pipes (51), the N third branch pipes (51) are connected to the first end openings of the N second coils (21) in a one-to-one relationship, the fourth refrigerant flow guide tube (6) has N fourth branch pipes (61), the N fourth branch pipes (61) are connected to the second end openings of the N second coils (21) in a one-to-one relationship, and M and N are not equal.

2. 2. The coiled microchannel heat exchanger according to claim 1, wherein M is greater than N, and when the air conditioner is in a cooling operation mode, the first refrigerant flow guide tube (3) is connected to the exhaust port of the compressor and the fourth refrigerant flow guide tube (6) is connected to the intake port of the compressor, and when the air conditioner is in a heating operation mode, the first refrigerant flow guide tube (3) is connected to the intake port of the compressor and the fourth refrigerant flow guide tube (6) is connected to the exhaust port of the compressor.

3. 2. The coil-type microchannel heat exchanger according to claim 1, further comprising a throttle member between the second refrigerant flow guide tube (4) and the third refrigerant flow guide tube (5), and the second refrigerant flow guide tube (4) and the third refrigerant flow guide tube (5) are in communication with each other through the throttle member.

4. 4. The coil-type microchannel heat exchanger according to claim 3, characterized in that the throttling member is a separator (8) having a first throttling hole (81), the second refrigerant flow guide tube (4) and the third refrigerant flow guide tube (5) are integrally molded straight tubes, and the separator (8) is connected inside the straight tubes.

5. 5. The serpentine micro-channel heat exchanger according to claim 4, wherein the straight tube is located on the intake side of the serpentine micro-channel heat exchanger, and the first refrigerant flow guide tube (3) and the fourth refrigerant flow guide tube (6) are located on the exhaust side of the serpentine micro-channel heat exchanger.

6. 4. The coil-type microchannel heat exchanger according to claim 3, wherein the throttling member is a spray pipe (7) having a second throttling hole (71), one end of the spray pipe (7) is a closed end and the other end of the spray pipe (7) is an open end, the closed end and the second throttling hole (71) are located in the second refrigerant flow guide tube (4), and the open end is located in the fourth refrigerant flow guide tube (6).

7. 7. The serpentine micro-channel heat exchanger according to claim 6, wherein the first refrigerant flow guide tube (3) and the fourth refrigerant flow guide tube (6) are located on the exhaust side of the serpentine micro-channel heat exchanger, and the second refrigerant flow guide tube (4) and the third refrigerant flow guide tube (5) are located on the intake side of the serpentine micro-channel heat exchanger.

8. 2. The serpentine microchannel heat exchanger according to claim 1, wherein the first serpentine (11) includes a first outer serpentine (111) located on the intake side of the serpentine microchannel heat exchanger and a first inner serpentine (112) located on the exhaust side of the serpentine microchannel heat exchanger, the first outer serpentine (111) and the first inner serpentine (112) are connected in series, and a first end opening of the first outer serpentine (111) and a first end opening of the first inner serpentine (112) are connected by a first connecting pipe (113).

9. 9. The serpentine microchannel heat exchanger according to claim 8, characterized in that the second serpentine (21) includes a second outer serpentine (211) located on the intake side of the serpentine microchannel heat exchanger and a second inner serpentine (212) located on the exhaust side of the serpentine microchannel heat exchanger, the second outer serpentine (211) and the second inner serpentine (212) are connected in series, and a first end opening of the second outer serpentine (211) and a first end opening of the second inner serpentine (212) are connected by a second connecting pipe (213).

10. An air conditioner comprising the coiled microchannel heat exchanger according to any one of claims 1 to 9.

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