CN111928538A - Microchannel heat exchanger, air conditioner and heat pump system - Google Patents

Abstract

The invention provides a micro-channel heat exchanger, an air conditioner and a heat pump system. The micro-channel heat exchanger includes a liquid pipe, and the lumen of the liquid pipe is provided with a jet baffle plate with jet holes to separate the lumen. There are a first cavity connected with the flat tube and a second cavity connected with the liquid inlet and outlet pipes. The second cavity is provided with a plurality of sub-chamber partitions, and a plurality of the sub-chamber partitions are located in the spray partition. and the wall of the liquid pipe to separate the second cavity into a plurality of liquid separation sub-cavities, and the plurality of liquid separation sub-cavities respectively have the corresponding liquid inlet and outlet pipes. According to the micro-channel heat exchanger, air conditioner, and heat pump system of the present invention, the second cavity is divided into a plurality of sub-chambers, so that the refrigerant can be separated into the sub-chambers and then sprayed through the spray partition. Atomization enters the corresponding flat tube, the refrigerant distribution is more uniform, and the performance of the heat exchanger is better.

Description

Microchannel heat exchangers, air conditioners, heat pump systems

technical field

The invention belongs to the technical field of air conditioning, and in particular relates to a microchannel heat exchanger, an air conditioner and a heat pump system.

Background technique

When the micro-channel heat exchanger is used as an evaporator, the inlet is generally gas-liquid two-phase, while most of the headers of the traditional micro-channel heat exchanger do not have diversion measures, and the gas-liquid two-phase stratification phenomenon is obvious after entering the header, resulting in The refrigerant entering the flat tube is unevenly distributed, and the heat exchange performance of the heat exchanger is poor. In order to overcome the aforementioned deficiencies, in the prior art, a corresponding partition plate with injection holes is arranged in the header to atomize the refrigerant entering the header. However, because the refrigerant enters only one way, this The phenomenon of gas-liquid two-phase separation of the refrigerant in the cavity of the header is still relatively obvious, and the distribution of the refrigerant finally entering the microchannel flat tube is still not uniform enough, and the heat exchange performance of the heat exchanger still needs to be improved.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to provide a micro-channel heat exchanger, an air conditioner, and a heat pump system, which divides the second cavity into a plurality of sub-chambers, so that the refrigerant can be separated into a plurality of sub-chambers. Then, it is sprayed and atomized into the corresponding flat tubes through the spray baffle, and the refrigerant distribution is more uniform and the heat exchanger performance is better.

In order to solve the above problems, the present invention provides a micro-channel heat exchanger, which includes a liquid pipe, and the lumen of the liquid pipe is provided with a jet baffle plate with jet holes to separate the lumen into a flat tube connected to the flat tube. A first cavity and a second cavity connected with the liquid inlet and outlet pipes, the second cavity is provided with a plurality of sub-chamber partitions, and the plurality of the sub-chamber partitions are located between the spray partition and the liquid pipe wall The second cavity is divided into a plurality of liquid separation sub-cavities, and the plurality of liquid separation sub-cavities respectively have the corresponding liquid inlet and outlet pipes.

Preferably, the liquid inlet and outlet pipe includes a straight pipe section and a bent section in the liquid separation sub-chamber, and the liquid outlet direction of the bent section is not parallel to the flow direction of the injection hole.

Preferably, each liquid distribution sub-chamber has at least two liquid inlet and outlet pipes.

Preferably, the liquid outlet directions of the bent sections of the two liquid inlet and outlet pipes are both vertically upward, and the straight pipe section of the lower liquid inlet and outlet pipes of the two liquid inlet and outlet pipes extends into the liquid separation sub-chamber. The depth is greater than the depth that the straight pipe section of the upper liquid inlet and outlet pipes of the two liquid inlet and outlet pipes protrudes into the liquid separation sub-chamber.

Preferably, the diameter of the injection hole is s, and 0.05mm≤s≤1.5mm.

Preferably, the microchannel heat exchanger further comprises a flow divider, the flow divider has an inlet and a plurality of outlets, and the plurality of outlets are connected to the plurality of the liquid inlet and outlet pipes in a one-to-one correspondence.

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

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

The present invention provides a microchannel heat exchanger, an air conditioner, and a heat pump system, wherein the second cavity is divided into a plurality of relatively independent liquid-separating sub-cavities through a plurality of the sub-cavity partitions, thereby making the prior art The overall cavity is divided into a plurality of smaller-sized liquid-separating sub-chambers. After the refrigerant in the liquid inlet and outlet pipes enters each liquid-separating sub-chamber, it is not easy to produce gas-liquid two-phase separation, and then under the ejection effect of the ejection holes The atomization effect is better and enters the corresponding flat tube, the refrigerant distribution is more uniform, and the heat exchanger performance is better.

Description of drawings

1 is a schematic structural diagram of a microchannel heat exchanger according to an embodiment of the present invention;

2 is a schematic structural diagram of a microchannel heat exchanger according to another embodiment of the present invention;

3 is a schematic structural diagram of a microchannel heat exchanger according to yet another embodiment of the present invention;

4 is a schematic structural diagram of a microchannel heat exchanger according to yet another embodiment of the present invention;

Fig. 5 is the three-dimensional structure schematic diagram of the liquid pipe in Fig. 1;

FIG. 6 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention.

Reference numerals are indicated as:

1. Liquid pipe; 11. Injection baffle; 111. Injection hole; 12. First cavity; 13. Second cavity; 14. Sub-chamber baffle; 15. Liquid inlet and outlet; 151. Liquid inlet and outlet; 16. Flat Pipe installation gap; 2. Air pipe; 21. 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 ways

1 to 6 , according to an embodiment of the present invention, a micro-channel heat exchanger is provided, including a liquid pipe 1 and a gas pipe 2 , and the liquid pipe 1 and the gas pipe 2 pass through a plurality of flat pipes 3 Forming through the refrigerant, the lumen of the liquid pipe 1 is provided with a jet baffle 11 with a jet hole 111 to divide the lumen into a first cavity 12 connected with the flat tube 3 and a liquid inlet and outlet pipe 15. The second cavity 13, a plurality of sub-chamber partitions 14 are arranged in the second cavity 13, and a plurality of the sub-chamber partitions 14 are located between the spray partition 11 and the wall of the liquid pipe 1 to separate the The second cavity 13 is divided into a plurality of liquid separation sub-cavities, and the plurality of liquid separation sub-cavities respectively have the liquid inlet and outlet pipes 15 corresponding thereto. In this technical solution, the second cavity 13 is divided into a plurality of relatively independent liquid-separating sub-cavities by a plurality of the sub-cavity partitions 14, so that the overall cavity in the prior art is divided into a plurality of smaller sized sub-cavities. Small liquid separation sub-chambers, the refrigerant in the liquid inlet and outlet pipes 15 is not easy to separate the gas-liquid two-phase after entering each liquid separation sub-chamber, and then the atomization effect is better under the spraying effect of the spray holes 111 and enters the corresponding liquid separation sub-chambers. Flat tube, more uniform distribution of refrigerant and better performance of heat exchanger.

Preferably, the liquid inlet and outlet pipe 15 includes a straight pipe section and a bent section in the liquid separation sub-chamber, and the liquid outlet direction of the bent section is not parallel to the flow direction of the injection hole 111, so that the The refrigerant in the liquid inlet and outlet pipes 15 can be fully mixed in each sub-chamber to provide support, and will not be quickly ejected through the ejection holes 111 without being mixed due to parallel.

Preferably, each sub-chamber has at least two liquid inlet and outlet pipes 15 . At this time, various combinations can be adopted for the liquid outlet directions of the bent sections of the two liquid inlet and outlet pipes 15. For example, the liquid outlet directions of the two bent sections are the same or opposite. As shown in FIG. 2 to FIG. Corresponding at least two liquid inlet and outlet pipes 15 in the cavity can make the gas-liquid two-phase refrigerant in the liquid inlet and outlet pipes 15 enter into the liquid separation sub-chamber and mix first, so as to avoid the phenomenon of "dry steaming" in the heat exchanger as much as possible. In the best case, as shown in FIG. 4 , the liquid outlet directions of the bent sections of the two liquid inlet and outlet pipes 15 are all vertically upwards, and the liquid inlet and outlet pipes 15 located at the bottom of the two liquid inlet and outlet pipes 15 are vertically upward. The depth of the straight pipe section extending into the liquid separation sub-chamber is greater than the depth of the straight tube section of the liquid inlet and outlet pipes 15 located at the top of the two liquid inlet and outlet pipes 15 extending into the liquid separation sub-cavity, so that the two liquid inlet and outlet pipes 15 extend into the liquid separation sub-cavity. 15 The incoming refrigerant flows upward, and the upward and rear refrigerant can be fully mixed, and at the same time, the refrigerant in the upper part of the liquid separation sub-chamber can be more, so as to avoid the phenomenon of "dry steaming" in the upper part of the liquid separation sub-chamber.

Preferably, the diameter of the injection hole 111 is s, 0.05mm≤s≤1.5mm, so as to prevent the occurrence of disadvantages such as poor atomization and excessive pressure drop of the heat exchanger if the diameter is too large.

Further, the microchannel heat exchanger further includes a flow divider 4, and the flow divider 4 has an inlet 41 and a plurality of outlets 42, and the plurality of outlets 42 are connected to the plurality of the liquid inlet and outlet pipes 15 in a one-to-one correspondence.

FIG. 5 is a schematic cross-sectional 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 pipe 1. As for the liquid inlet and outlet pipes 15 , a plurality of flat tube installation notches 16 are formed on one side cavity wall of the first cavity 12 for inserting the flat tubes 3 to form a reliable connection.

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

As shown in FIG. 6 , according to an embodiment of the present invention, a heat pump system is further provided, including the above-mentioned microchannel heat exchanger. Specifically, the heat pump system further includes a throttle element 100 , a heat exchanger 101 , a compressor 102 , and a four-way valve 103 .

When the microchannel heat exchanger is used as a condenser, the ab and d of the four-way valve 103 are connected, and the refrigerant discharged from the compressor 102 passes through the four-way valve 103, and then enters the microchannel heat exchanger for condensation and heat release, and then passes through The right trachea 2 flows out in N paths, enters the throttling element 100 for throttling after being merged by the flow divider 4, 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 is used as an evaporator, the ac and bd of the four-way valve 103 are connected, and the refrigerant discharged from the compressor 102 enters the heat exchanger 101 through the four-way valve 103 for condensation and heat release, and then enters the throttling element 100 is throttled, and then divided into N paths through the flow divider 4 into the micro-channel heat exchanger for evaporation and heat absorption, and then flows out from the outlet of the gas pipe 2, and finally returns to the compressor 102 through the four-way valve 103 to complete the cycle.

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

The above are only 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. Inside. The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled 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 It is regarded as the protection scope of the present invention.

Claims (8)

1. A microchannel heat exchanger, characterized in that it comprises a liquid pipe (1), and the lumen of the liquid pipe (1) is provided with a jet baffle (11) with jet holes (111) to separate the described liquid pipe (1). The lumen is divided into a first cavity (12) connected with the flat tube (3) and a second cavity (13) connected with the liquid inlet and outlet pipes (15), wherein a plurality of sub-cavities (13) are arranged in the second cavity (13) A cavity partition (14), a plurality of the sub-chamber partitions (14) are located between the spray partition (11) and the wall of the liquid pipe (1) to separate the second cavity (13) It is a plurality of liquid separation sub-cavities, and the plurality of liquid separation sub-cavities respectively have the corresponding liquid inlet and outlet pipes (15). 2. The microchannel heat exchanger according to claim 1, characterized in that, the liquid inlet and outlet pipes (15) comprise a straight pipe section and a bent section in the liquid separation sub-chamber, and the bent section has a The liquid discharge direction is not parallel to the flow direction of the ejection holes (111). 3. The microchannel heat exchanger according to claim 2, characterized in that, each liquid separation sub-chamber has at least two liquid inlet and outlet pipes (15). 4. The microchannel heat exchanger according to claim 2, characterized in that, the liquid outlet directions of the bending sections of the two liquid inlet and outlet pipes (15) respectively are vertically upward, and the two liquid inlet and outlet pipes (15) In 15), the straight pipe section of the lower liquid inlet and outlet pipes (15) protrudes into the liquid separation sub-chamber to a greater depth than the straight pipe section of the upper liquid inlet and outlet pipes (15) of the two liquid inlet and outlet pipes (15) extends into The depth in the separatory sub-chamber. 5 . The microchannel heat exchanger according to claim 1 , wherein the diameter of the injection holes ( 111 ) is s, and 0.05mm≦s≦1.5mm. 6 . 6 . The microchannel heat exchanger according to claim 1 , further comprising a flow divider ( 4 ), the flow divider ( 4 ) having an inlet ( 41 ) and a plurality of outlets ( 42 ), and the plurality of outlets (42) are connected with the plurality of said liquid inlet and outlet pipes (15) in one-to-one correspondence. 7 . An air conditioner comprising a microchannel heat exchanger, wherein the microchannel heat exchanger is the microchannel heat exchanger according to any one of claims 1 to 6 . 8 . A heat pump system comprising a microchannel heat exchanger, wherein the microchannel heat exchanger is the microchannel heat exchanger according to any one of claims 1 to 6 .

Images