Microchannel heat exchanger, air conditioner, heat pump system

Abstract

The present invention provides a microchannel heat exchanger, an air conditioner, and a heat pump system. The microchannel heat exchanger includes a liquid pipe. A spray partition plate with spray holes is provided in the pipe cavity of the liquid pipe to divide the pipe cavity into a first cavity connected to a flat pipe and a second cavity connected to an inlet and outlet liquid pipe. A plurality of sub-cavity partition plates are provided in the second cavity, and the plurality of sub-cavity partition plates are between the spray partition plate and the pipe wall of the liquid pipe to divide the second cavity into a plurality of liquid separation sub-cavities, and each of the plurality of liquid separation sub-cavities has a corresponding inlet and outlet liquid pipe. According to a microchannel heat exchanger, an air conditioner, and a heat pump system of the present invention, the second cavity is divided into a plurality of liquid separation sub-cavities, so that the refrigerant can be separated into a plurality of sub-cavities and then sprayed and atomized into the corresponding flat pipe through the spray partition plate, and the refrigerant distribution is more uniform and the performance of the heat exchanger is better.

Description

Technical Field

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

[0002] When the microchannel heat exchanger is used as an evaporator, the inlet is generally gas-liquid two-phase. However, most of the manifolds of traditional microchannel heat exchangers do not have a flow splitting measure. After entering the manifold, the gas-liquid two-phase stratification phenomenon is obvious, resulting in uneven distribution of the refrigerant entering the flat tubes, and the heat exchange performance of the heat exchanger is poor. In order to overcome the foregoing deficiencies, corresponding partitions with injection holes are provided in the manifold in the prior art to atomize the refrigerant entering the manifold. However, since the refrigerant enters only in one path, the phenomenon of gas-liquid two-phase separation of the refrigerant in the cavity of the manifold is still relatively obvious, and finally the distribution of the refrigerant entering the microchannel flat tubes is still not uniform enough, and the heat exchange performance of the heat exchanger still needs to be improved. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a microchannel heat exchanger, an air conditioner, and a heat pump system, which divide the second cavity into multiple liquid separation sub-cavities, so that the refrigerant can be separated and then atomized by the injection partition and enter the corresponding flat tubes, and the refrigerant distribution is more uniform and the heat exchanger performance is better.

[0004] To solve the above problems, the present invention provides a microchannel heat exchanger, including a liquid pipe. A partition with injection holes is provided in the lumen of the liquid pipe to divide the lumen into a first cavity connected to the flat tube and a second cavity connected to the liquid inlet and outlet pipe. A plurality of sub-cavity partitions are provided in the second cavity, and the plurality of sub-cavity partitions are between the injection partition and the pipe wall of the liquid pipe to divide the second cavity into a plurality of liquid separation sub-cavities, and each of the plurality of liquid separation sub-cavities has a corresponding liquid inlet and outlet pipe.

[0005] Preferably, the liquid inlet and outlet pipe includes a straight pipe section and a bent section in the liquid separation sub-cavity, and the liquid outlet direction of the bent section is not parallel to the flow direction of the injection holes.

[0006] Preferably, each liquid separation sub-cavity has at least two liquid inlet and outlet pipes.

[0007] Preferably, the liquid outlet directions of the bent sections of the two liquid inlet and outlet pipes are both vertically upward, and the depth of the straight pipe section of the lower liquid inlet and outlet pipe in the liquid separation sub-cavity is greater than the depth of the straight pipe section of the upper liquid inlet and outlet pipe in the liquid separation sub-cavity.

[0008] Preferably, the aperture of the injection hole is s, and 0.05 mm ≤ s ≤ 1.5 mm.

[0009] Preferably, the microchannel heat exchanger further includes a diverter which has an inlet and a plurality of outlets, and the plurality of outlets are respectively and correspondingly connected to the plurality of liquid inlet and outlet pipes.

[0010] The present invention also provides an air conditioner including the above-mentioned microchannel heat exchanger.

[0011] The present invention also provides a heat pump system including the above-mentioned microchannel heat exchanger.

[0012] The microchannel heat exchanger, air conditioner and heat pump system provided by the present invention divide the second chamber into a plurality of relatively independent liquid distribution sub-chambers through a plurality of the sub-chamber partitions, so that the overall chamber in the prior art is divided into a plurality of liquid distribution sub-chambers with smaller sizes. After the refrigerant in the liquid inlet and outlet pipes enters each liquid distribution sub-chamber, it is not easy to generate gas-liquid two-phase separation. Furthermore, under the injection action of the injection holes, the atomization effect is better and the refrigerant enters the corresponding flat tubes, and the refrigerant distribution is more uniform and the performance of the heat exchanger is better. Description of the Drawings

[0013] Figure 1 is a schematic structural view of the microchannel heat exchanger according to an embodiment of the present invention;

[0014] Figure 2 is a schematic structural view of the microchannel heat exchanger according to another embodiment of the present invention;

[0015] Figure 3 is a schematic structural view of the microchannel heat exchanger according to still another embodiment of the present invention;

[0016] Figure 4 is a schematic structural view of the microchannel heat exchanger according to still another embodiment of the present invention;

[0017] Figure 5 is Figure 1 a three-dimensional structural view of the liquid pipe in

[0018] Figure 6 is a schematic structural view of the heat pump system according to an embodiment of the present invention.

[0019] The reference signs are shown as:

[0020] 1. Liquid pipe; 11. Injection partition; 111. Injection hole; 12. First chamber; 13. Second chamber; 14. Sub-chamber partition; 15. Liquid inlet and outlet pipe; 151. Liquid inlet and outlet; 16. Flat pipe installation notch; 2. Gas pipe; 21. Gas inlet and outlet pipe; 3. Flat pipe; 4. Diverter; 41. Inlet; 42. Outlet; 100. Throttle element; 101. Heat exchanger; 102. Compressor; 103. Four-way valve. Detailed Embodiments

[0021] Referring to Figures 1 to 6As shown, according to an embodiment of the present invention, a microchannel heat exchanger is provided, including a liquid pipe 1 and a gas pipe 2. The liquid pipe 1 and the gas pipe 2 are in communication with refrigerant through a plurality of flat pipes 3. A spray partition 11 with spray holes 111 is provided in the lumen of the liquid pipe 1 to divide the lumen into a first chamber 12 connected to the flat pipes 3 and a second chamber 13 connected to the liquid inlet and outlet pipe 15. A plurality of sub-chamber partitions 14 are provided in the second chamber 13. The plurality of sub-chamber partitions 14 are between the spray partition 11 and the wall of the liquid pipe 1 to divide the second chamber 13 into a plurality of liquid distribution sub-chambers, and each of the plurality of liquid distribution sub-chambers has a corresponding liquid inlet and outlet pipe 15. In this technical solution, the second chamber 13 is divided into a plurality of relatively independent liquid distribution sub-chambers by the plurality of sub-chamber partitions 14, so that the overall chamber in the prior art is divided into a plurality of liquid distribution sub-chambers with smaller sizes. After the refrigerant in the liquid inlet and outlet pipe 15 enters each liquid distribution sub-chamber, it is not easy to generate the separation of gas-liquid two phases. Furthermore, under the spraying action of the spray holes 111, the atomization effect is better and it enters the corresponding flat pipes, and the refrigerant distribution is more uniform and the heat exchanger performance is better.

[0022] Preferably, the liquid inlet and outlet pipe 15 includes a straight pipe section and a bent section in the liquid distribution sub-chamber. The liquid outlet direction of the bent section is not parallel to the flow direction of the spray holes 111, so as to support the sufficient mixing of the refrigerant in the liquid inlet and outlet pipe 15 in each liquid distribution sub-chamber, and it will not be sprayed out without mixing quickly through the spray holes 111 due to being parallel.

[0023] Preferably, each liquid distribution sub-chamber has at least two liquid inlet and outlet pipes 15. At this time, the liquid outlet directions of the bent sections of the two liquid inlet and outlet pipes 15 can adopt various combinations. For example, the liquid outlet directions of the two bent sections are the same or opposite, as Figures 2 to 3 shown. Having at least two liquid inlet and outlet pipes 15 corresponding to one liquid distribution sub-chamber can enable the gas-liquid two-phase refrigerant in the liquid inlet and outlet pipes 15 to be mixed first after entering the liquid distribution sub-chamber, and try to avoid the phenomenon of "dry evaporation" in the heat exchanger. Preferably, as Figure 4 shown, the liquid outlet directions of the bent sections respectively provided on the two liquid inlet and outlet pipes 15 are both vertically upward, and the depth of the straight pipe section of the lower liquid inlet and outlet pipe 15 in the liquid distribution sub-chamber is greater than the depth of the straight pipe section of the upper liquid inlet and outlet pipe 15 in the liquid distribution sub-chamber among the two liquid inlet and outlet pipes 15. In this way, the refrigerant coming in from the two liquid inlet and outlet pipes 15 all flows upward, and the refrigerant after flowing upward can be fully mixed. At the same time, there is more refrigerant in the upper part of the liquid distribution sub-chamber, avoiding the phenomenon of "dry evaporation" in the upper part of the liquid distribution sub-chamber.

[0024] Preferably, the aperture of the spray holes 111 is s, and 0.05 mm ≤ s ≤ 1.5 mm, to prevent the disadvantages of poor atomization due to too large aperture and too large pressure drop of the heat exchanger due to too small aperture.

[0025] Furthermore, the microchannel heat exchanger further includes a diverter 4, the diverter 4 having an inlet 41 and a plurality of outlets 42, and the plurality of outlets 42 are respectively and correspondingly connected to the plurality of liquid inlet and outlet pipes 15.

[0026] Figure 5 Fig. shows a cross-sectional schematic view of the three-dimensional structure of the liquid pipe 1 in the embodiment of the present invention. It can be seen that two liquid inlet and outlet ports 151 are provided on the wall of each liquid separation sub-chamber for installing the liquid inlet and outlet pipes 15, and a plurality of flat pipe installation notches 16 are formed on one side wall of the first chamber 12 for inserting the flat pipes 3 to form a reliable connection.

[0027] According to an embodiment of the present invention, there is also provided an air conditioner including the above-mentioned microchannel heat exchanger.

[0028] As Figure 6 shown, according to an embodiment of the present invention, there is also provided a heat pump system including the above-mentioned microchannel heat exchanger. Specifically, the heat pump system further includes a throttling element 100, a heat exchanger 101, a compressor 102, and a four-way valve 103.

[0029] When the microchannel heat exchanger serves as a condenser, the ab ports of the four-way valve 103 are connected, and the cd ports are connected. The refrigerant discharged from the compressor 102 passes through the four-way valve 103, then enters the microchannel heat exchanger for condensation and heat release, and then flows out in N paths through the right air pipe 2. After converging through the diverter 4, it enters the throttling element 100 for throttling, then enters the heat exchanger 101 for evaporation and heat absorption, and then returns to the compressor 102 through the four-way valve 103 to complete the cycle; when the microchannel heat exchanger serves as an evaporator, the ac ports of the four-way valve 103 are connected, and the bd ports are connected. The refrigerant discharged from the compressor 102 passes through the four-way valve 103 and enters the heat exchanger 101 for condensation and heat release, then enters the throttling element 100 for throttling, then is divided into N paths through the diverter 4 and enters the microchannel heat exchanger for evaporation and heat absorption, then flows out from the outlet of the air pipe 2, and finally returns to the compressor 102 through the four-way valve 103 to complete the cycle.

[0030] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0031] 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 principles 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, 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 microchannel heat exchanger, characterized in that, It includes a liquid pipe (1). In the lumen of the liquid pipe (1), there is a spraying partition plate (11) with spraying holes (111) which divides the lumen into a first chamber (12) connected to a flat pipe (3) and a second chamber (13) connected to an inlet and outlet liquid pipe (15). In the second chamber (13), there are multiple sub-chamber partition plates (14). The multiple sub-chamber partition plates (14) are between the spraying partition plate (11) and the wall of the liquid pipe (1) to divide the second chamber (13) into multiple liquid distribution sub-chambers. Each of the multiple liquid distribution sub-chambers has a corresponding inlet and outlet liquid pipe (15); the inlet and outlet liquid pipe (15) includes a straight pipe section and a bent section in the liquid distribution sub-chamber. The liquid outlet direction of the bent section is not parallel to the flow direction of the spraying holes (111); each liquid distribution sub-chamber has at least two inlet and outlet liquid pipes (15); the liquid outlet directions of the bent sections of the two inlet and outlet liquid pipes (15) are both vertically upward, and the depth of the straight pipe section of the lower inlet and outlet liquid pipe (15) among the two inlet and outlet liquid pipes (15) extending into the liquid distribution sub-chamber is greater than the depth of the straight pipe section of the upper inlet and outlet liquid pipe (15) among the two inlet and outlet liquid pipes (15) extending into the liquid distribution sub-chamber, so that the liquid outlet directions of the inlet and outlet liquid pipes (15) in each liquid distribution sub-chamber all face the top wall of the liquid distribution sub-chamber where they are located; it further includes a flow divider (4). The flow divider (4) has an inlet (41) and multiple outlets (42). The multiple outlets (42) are connected to the multiple inlet and outlet liquid pipes (15) in one-to-one correspondence.

2. The microchannel heat exchanger according to claim 1, wherein The aperture of the spraying holes (111) is s, and 0.05 mm ≤ s ≤ 1.5 mm.

3. An air conditioner, comprising a microchannel heat exchanger, characterized in that, The microchannel heat exchanger is the microchannel heat exchanger according to any one of claims 1 to 2.

4. A heat pump system, comprising a microchannel heat exchanger, characterized in that, The microchannel heat exchanger is the microchannel heat exchanger according to any one of claims 1 to 2.

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