An air conditioner

Abstract

The present invention discloses an air conditioner, which relates to the technical field of refrigeration equipment and aims to solve the problem of reduced heat exchange efficiency caused by uneven distribution of gas-liquid two-phase refrigerant in the microchannel heat exchanger at the evaporator. The air conditioner includes a heat exchanger and at least one two-phase distribution device. The heat exchanger includes a first header and a plurality of connected flat tubes. The two-phase separator of the two-phase distribution device is sequentially provided with a first through hole, a second through hole and a third through hole communicated with the separation chamber along a first straight line direction. One end of the gas pipe is connected to the first through hole, and the other end is inserted into the first header and provided with gas spray holes. One end of the liquid pipe is connected to the third through hole, and the other end is inserted into the first header and provided with liquid spray holes, and the gas spray holes and the liquid spray holes are staggeredly distributed. Along the first straight line direction, the gas pipe and the liquid pipe are located on opposite sides of the connected two-phase separators, and the gas spray holes and the liquid spray holes are arranged facing each other. The air conditioner provided by the present invention is used to improve the heat exchange efficiency of the heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and particularly to an air conditioner. Background Art

[0002] In an air-conditioning system, the refrigerant entering the evaporator is a gas-liquid two-phase mixed refrigerant, also known as a gas-liquid two-phase refrigerant or a gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant absorbs heat from the air and vaporizes in the evaporator, and releases heat to liquefy in the condenser, so as to achieve the purpose of adjusting the environmental temperature and humidity.

[0003] When the evaporator is a microchannel heat exchanger, the microchannel heat exchanger may include a plurality of microchannel flat tubes and header pipes and other structures. The two ends of the microchannel flat tubes are connected to the header pipe. When the gas-liquid two-phase refrigerant passes through the header pipe and enters the multiple flat tubes for heat exchange. Due to the inconsistent densities of the gas and the liquid, under the action of gravity, there will be more liquid-phase refrigerant and less gas-phase refrigerant flowing through some of the microchannel flat tubes, and more gas-phase refrigerant and less liquid-phase refrigerant flowing through another part of the microchannel flat tubes. That is, the gas-liquid two-phase refrigerant in the multiple microchannel flat tubes cannot be evenly distributed. Since the liquid-phase refrigerant flow rate in the microchannel flat tubes corresponding to some heat exchanger regions is small, the heat exchange performance of this part of the heat exchanger region will be greatly reduced, resulting in the problem of reduced heat exchange efficiency of the microchannel heat exchanger of the evaporator. Summary of the Invention

[0004] The purpose of the present invention is to provide an air conditioner, aiming to solve the problem of reduced heat exchange efficiency caused by uneven distribution of the gas-liquid two-phase refrigerant in the microchannel heat exchanger at the evaporator.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] Some embodiments of the present invention provide an air conditioner, including a heat exchanger and at least one two-phase distribution device. The heat exchanger includes a first header pipe and a plurality of flat tubes. The plurality of flat tubes are spaced apart along a first straight line direction, the length direction of each flat tube intersects with the first straight line direction, and one ends of the plurality of flat tubes are connected to the first header pipe. The two-phase distribution device includes a two-phase separator, a gas pipe, and a liquid pipe. The two-phase separator is provided with a separation chamber, and the two-phase separator is further provided with a first through hole, a second through hole, and a third through hole communicating with the separation chamber in sequence along the first straight line direction. One end of the gas pipe is connected to the first through hole, the other end is inserted into the first header pipe and is provided with a gas spray hole. One end of the liquid pipe is connected to the third through hole, the other end is inserted into the first header pipe and is provided with a liquid spray hole, and the gas spray hole and the liquid spray hole are misaligned. Along the first straight line direction, the gas pipe and the liquid pipe are located on opposite sides of the connected two-phase separator, and the gas spray hole and the liquid spray hole are oppositely arranged.

[0007] Since one end of the gas pipe inserted into the shunt cavity can be arranged close to one end of the shunt cavity, one end of the liquid pipe correspondingly inserted into the shunt cavity can be arranged close to the other end of the shunt cavity, and the gas injection hole and the liquid injection hole can be arranged facing each other. So that the liquid-phase refrigerant ejected from the liquid injection hole can form a liquid filling area in the shunt cavity along the first straight line direction, and correspondingly, the gas-phase refrigerant ejected from the gas injection hole can form a gas filling area in the shunt cavity along the first straight line direction. Thereby making the distribution of the gaseous refrigerant in the gas filling area formed by injection more uniform, and the distribution of the liquid refrigerant in the liquid filling area formed by injection is also more uniform.

[0008] Based on this, the gas injection hole and the liquid injection hole can be arranged in a staggered distribution. In this way, the impact interference between the gas filling area and the liquid filling area can be reduced. Under the action of gravity, the uniformly distributed gas filling area and liquid filling area can make the two-phase refrigerant mix uniformly during the process of flowing into the microchannel along the length direction of the flat tube, which is beneficial to improving the heat exchange efficiency of the heat exchanger provided with the first header and multiple flat tubes, thereby increasing the energy efficiency ratio of the air conditioner. In some embodiments, in the first header, along the length direction of the flat tube, multiple flat tubes are connected to the same side of the first header, and the liquid injection holes are spaced between the gas injection holes and the flat tubes, which is beneficial to improving the uniformity of the mixing of the gas-liquid two-phase refrigerant.

[0009] In some embodiments, along the length direction of the flat tube, the width dimension of the first header is D, the distance between the central axes of the gas injection hole and the liquid injection hole is d1, and 3d1≥D is satisfied, which can reduce the impact interference between the gas filling area and the liquid filling area.

[0010] In some embodiments, along the length direction of the flat tube, the maximum distance between the end face of the gas pipe close to the flat tube and the side of the first header away from the flat tube is d2, and the maximum distance between the end face of the liquid pipe close to the flat tube and the side of the first header away from the flat tube is d3, and 3d2<D, D<3d3<2D are satisfied, which reasonably arranges the structural distribution in the shunt cavity.

[0011] In some embodiments, both the gas pipe and the liquid pipe are capillary tube structures, which are simple in structure and beneficial to improving the flow rate of the refrigerant.

[0012] In some embodiments, the aperture of the gas injection hole is less than or equal to the inner diameter of the gas pipe, which is beneficial to improving the ejection speed of the gas-phase refrigerant.

[0013] In some embodiments, the aperture of the liquid injection hole is less than or equal to the inner diameter of the liquid pipe, which is beneficial to improving the ejection speed of the liquid-phase refrigerant.

[0014] In some embodiments, along the first linear direction, the two-phase separator includes a first conical shell, a side plate shell, and a second conical shell connected in sequence. The tips of the first conical shell and the second conical shell are away from each other. A first through hole is provided at the end of the first conical shell away from the second conical shell, a second through hole is provided on the side plate shell, and a third through hole is provided at the end of the second conical shell away from the first conical shell. The arrangement of the two conical tips at both ends facilitates the collection and outflow of the gaseous refrigerant and the liquid refrigerant.

[0015] In some embodiments, the first manifold is of a circular tube structure. Along the radial direction of the first manifold, the two-phase separator is provided with a concave surface in contact with the first manifold, which can increase the contact area between the two-phase separator and the first manifold and make the installation more stable.

[0016] In some embodiments, the two-phase separator is a three-way joint, which has a simple and effective structure.

[0017] In some embodiments, the first manifold is provided with a plurality of flow distribution chambers, and the number of two-phase distribution devices is also a plurality. Each flow distribution chamber communicates with a plurality of flat tubes, and the plurality of flow distribution chambers are arranged in one-to-one correspondence with the plurality of two-phase distribution devices. The gas pipe and the liquid pipe of one two-phase distribution device are inserted into the same flow distribution chamber, and the gas pipe in the same flow distribution chamber is located above the liquid pipe along the first linear direction. The heat exchanger further includes a second manifold, the second manifold is provided with a first collection chamber, and each flow distribution chamber communicates with the first collection chamber through a plurality of flat tubes. The first collection chamber can be connected to a four-way valve, and the structure is simple.

[0018] In some embodiments, the first manifold is further provided with a plurality of second collection chambers. The number of the second collection chambers is the same as the number of the flow distribution chambers, and the flow distribution chambers and the second collection chambers are alternately distributed along the first linear direction. Each second collection chamber is used to connect to the four-way valve of the air conditioner. The flat tubes include a plurality of first flat tubes and a plurality of second flat tubes distributed along the first linear direction. One flow distribution chamber is connected to one end of a plurality of first flat tubes, and one second collection chamber is connected to one end of a plurality of second flat tubes. The number of the first collection chambers is a plurality and is the same as the number of the flow distribution chambers, and one first collection chamber communicates with an adjacent flow distribution chamber and a second collection chamber through a plurality of first flat tubes and a plurality of second flat tubes. This enables the refrigerant to be vaporized in the first flat tubes and the second flat tubes in sequence. By increasing the heat exchange area and the heat exchange duration between the refrigerant and the air, it is beneficial to improve the heat exchange efficiency of the heat exchanger.

[0019] In some embodiments, each flat tube is provided with a plurality of microchannels, and one microchannel penetrates the flat tube along the length direction of the flat tube for the cyclic flow of the refrigerant. The arrangement of the plurality of microchannels can further increase the heat exchange area between the refrigerant flowing through the flat tube and the air.

[0020] In some embodiments, the heat exchanger further includes a plurality of fins. Along the first linear direction, at least one fin is installed between two adjacent flat tubes, and the fin is in contact connection with the two adjacent flat tubes, further increasing the heat exchange area of the heat exchanger to improve the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of a connection structure of an air conditioner provided by an embodiment of the present application;

[0023] Figure 2 Front view of a heat exchanger provided by an embodiment of the present application;

[0024] Figure 3 For Figure 2 Partial enlarged schematic diagram at A in

[0025] Figure 4 For Figure 2 Partial enlarged schematic diagram at B in

[0026] Figure 5 Partial structure schematic diagram of a heat exchanger provided by the present application;

[0027] Figure 6 For Figure 4 Cross-sectional view of a part of the heat exchanger shown;

[0028] Figure 7 For Figure 2 Front view of the connection and installation of the two-phase distribution device and the heat exchanger shown in

[0029] Figure 8 For Figure 7 Cross-sectional view of the two-phase distribution device and the heat exchanger shown in

[0030] Figure 9 For Figure 8 Three-dimensional structure schematic diagram of the first two-phase separator shown in

[0031] Figure 10 For Figure 8 Front cross-sectional view of the second two-phase separator shown in

[0032] Figure 11 For Figure 8 Three-dimensional structure schematic diagram of the third two-phase separator shown in

[0033] Figure 12 For Figure 2 a simplified structural schematic diagram of the connection between the heat exchanger shown and the two-phase distribution device;

[0034] Figure 13 Another simplified structural schematic diagram of the connection between the heat exchanger and the two-phase distribution device provided by the embodiment of the present application.

[0035] Reference numerals:

[0036] 100 - air conditioner;

[0037] 11 - compressor assembly; 12 - four-way valve; 13 - throttling device;

[0038] 14 - heat exchanger; 141 - outdoor heat exchanger; 142 - indoor heat exchanger;

[0039] 143 - first header; 144 - flat tube; 1441 - first flat tube; 1442 - second flat tube; 145 - second header; 1461 - shunt chamber; 1462 - microchannel; 1463 - first collection chamber; 1464 - heat exchanger port; 1465 - second collection chamber; 147 - fin;

[0040] 15 - shunt device;

[0041] 16 - two-phase distribution device; 161 - two-phase separator; 1611 - separation chamber; 1612 - first through hole; 1613 - second through hole; 1614 - third through hole; 1615 - first conical shell; 1616 - side plate shell; 1617 - second conical shell; 162 - gas pipe; 163 - liquid pipe; 164 - gas injection hole; 165 - liquid injection hole. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0043] It should be noted that all the directional indications (such as up, down, left, right, front, back, inside, outside, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0045] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. Additionally, when describing pipelines, the terms "connected" and "coupled" used in this application have the meaning of conducting. When describing electronic components, the terms "connected" and "coupled" used in this application have the meaning of conducting through an electric current. The specific meaning needs to be understood in combination with the context.

[0046] In the embodiments of this application, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, article or device comprising such element.

[0047] In the embodiments of this application, words such as "exemplarily" or "for example" are used to denote examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplarily" or "for example" is intended to present relevant concepts in a specific manner.

[0048] The embodiments of this application provide an air conditioner, which can be used to adjust the indoor air environment, such as adjusting the indoor environmental humidity, increasing the indoor temperature, decreasing the indoor temperature, and filtering and purifying the indoor air, etc.

[0049] As Figure 1 shown, Figure 1Schematic diagram of a connection structure of an air conditioner 100 provided by an embodiment of the present application. The air conditioner 100 may include a compressor assembly 11, a four-way valve 12, a throttling device 13, and a heat exchanger 14. Exemplarily, the four-way valve 12 may have four ports A, B, C, and D, and the heat exchanger 14 may include an outdoor heat exchanger 141 and an indoor heat exchanger 142. One end of the compressor assembly 11 may be connected to port A of the four-way valve, and the other end of the compressor assembly 11 may be connected to port B of the four-way valve. Port C of the four-way valve may be connected to one end of the outdoor heat exchanger 141, the other end of the outdoor heat exchanger 141 may be connected to the indoor heat exchanger 142 through the throttling device 13, and the other end of the indoor heat exchanger 142 may be connected to port D of the four-way valve.

[0050] Based on this, taking the example that port A of the four-way valve 12 may be connected to the intake end of the compressor assembly 11. The compressor assembly 11 may include a gas-liquid separator, a compressor main body, and an oil separator connected in sequence. The intake end of the gas-liquid separator is connected to port A of the four-way valve 12, the other end of the gas-liquid separator may be connected to the intake end of the compressor main body, the intake end of the oil separator may be connected to the other end of the compressor main body, and the other end of the oil separator may be connected to port B of the four-way valve 12. So that the refrigerant can flow through the gas-liquid separator, the compressor main body, and the oil separator of the compressor assembly 11 in sequence through port A of the four-way valve 12, and then the compressed refrigerant can flow into the four-way valve 12 through port B of the four-way valve 12.

[0051] In this way, in the refrigeration condition, the four-way valve 12 can be adjusted to make port B and port C conduct, and make port D and port A conduct. Based on this, the refrigerant can circulate in sequence along the refrigerant passage between the compressor assembly 11, port B and port C of the four-way valve 12, the outdoor heat exchanger 141, the throttling device 13, the indoor heat exchanger 142, port D and port A of the four-way valve 12, and the compressor assembly 11. Through the work of the compressor assembly 11, the refrigerant can be liquefied and release heat at the outdoor heat exchanger 141, and the refrigerant will then evaporate and absorb heat at the indoor heat exchanger 142. Thus, the heat exchange between the indoor heat exchanger 142 and the outdoor heat exchanger 141 is completed and used to lower the indoor temperature.

[0052] In the heating mode, the four-way valve 12 is adjusted to make port B and port D conduct, and port C and port A conduct. In this way, the refrigerant can circulate in turn within the refrigerant passage between the compressor assembly 11, port B and port D of the four-way valve 12, the indoor heat exchanger 142, the throttling device 13, the outdoor heat exchanger 141, port C and port A of the four-way valve 12, and the compressor assembly 11. And, through the work done by the compressor assembly 11, the refrigerant can liquefy and release heat at the indoor heat exchanger 142 and then absorb heat by evaporation at the outdoor heat exchanger 141. Thus, the heat exchange between the indoor heat exchanger 142 and the outdoor heat exchanger 141 is completed and used to increase the indoor temperature.

[0053] Under the action of the compressor assembly 11, through the circulation of the above refrigerant, the air conditioner 100 can achieve efficient refrigeration or heating effects on the indoor air during the process of adjusting the indoor air environment. Among them, in the refrigeration or heating mode, in order to meet the efficient refrigeration or heating effects of the air conditioner 100, it is necessary for the outdoor heat exchanger 141 and the indoor heat exchanger 142 to be able to exchange heat efficiently with the air. Especially for the outdoor heat exchanger 141, if the outdoor heat exchanger 141 cannot exchange heat sufficiently with the air, it will affect the heat exchange efficiency of the indoor air, thereby reducing the refrigeration or heating power consumption ratio of the air conditioner 100.

[0054] Taking the outdoor heat exchanger 141 as an example, in the heating mode, since the refrigerant flowing through the indoor heat exchanger 142 cannot release heat and liquefy sufficiently at the indoor heat exchanger 142, the refrigerant flowing out of the indoor heat exchanger 142 is a gas-liquid two-phase mixed refrigerant. Based on this, during the process of the two-phase refrigerant flowing through the outdoor heat exchanger 141, due to the inconsistent densities of the gaseous refrigerant and the liquid refrigerant, under the action of gravity, a large amount of gaseous refrigerant will be concentrated in some refrigerant pipes of the outdoor heat exchanger 141, resulting in a small refrigerant flow rate in this part of the area of the outdoor heat exchanger 141, so that this part of the outdoor heat exchanger 141 cannot absorb the heat of the air sufficiently, and the heat exchange efficiency of the outdoor heat exchanger 141 will be reduced.

[0055] To solve the above problems, as Figure 1 shown, the air conditioner 100 may further include a flow splitting device 15. The flow splitting device can be arranged between the throttling device 13 and the outdoor heat exchanger 141. The liquid inlet end of the flow splitting device 15 can be communicated with the throttling device 13, and multiple liquid outlet ends of the flow splitting device 15 can be respectively connected to multiple refrigerant passages in the outdoor heat exchanger 141 in one-to-one correspondence. In this way, during the process of the gas-liquid two-phase refrigerant flowing through the flow splitting device 15 and flowing into multiple refrigerant passages in the outdoor heat exchanger 141, the flow splitting device 15 can make the gas-liquid two-phase refrigerant split more evenly, so that the gas-liquid two-phase refrigerant flowing through each refrigerant passage of the outdoor heat exchanger 141 can be distributed more evenly. This is beneficial to maintaining a high heat exchange efficiency at the outdoor heat exchanger 141.

[0056] In some embodiments, when the outdoor heat exchanger 141 is a finned heat exchanger including multiple copper tubes and a plurality of fins, since the liquid outlet end of the flow dividing device 15 can be configured as a capillary tube (a type of copper tube structure). Thus, the diameter of the copper tubes in the outdoor heat exchanger 141 is not much different from that of the capillary tubes, and it is relatively convenient to connect each liquid outlet end to a copper tube of the outdoor heat exchanger 141, and the outdoor heat exchanger 141 can maintain an efficient heat exchange working state.

[0057] However, in some other embodiments, as Figure 2 shown, the heat exchanger 14 can also be a microchannel heat exchanger. The microchannel heat exchanger can be an indoor heat exchanger 142 or an outdoor heat exchanger 141. Taking the microchannel heat exchanger as the outdoor heat exchanger 141 as an example. Referring to Figure 3 , Figure 3 is Figure 2 a partial enlarged schematic view of point A in Figure 4 , Figure 4 the heat exchanger 14 can include a first header 143 and a plurality of flat tubes 144. Combining Figure 4 , Figure 4 is Figure 2 a partial enlarged schematic view of point B in Figure 3 , the heat exchanger 14 can further include a second header 145. Taking the length direction of the first header 143 as the up and down direction in Figure 3 (i.e., parallel to the first straight line direction) as an example, each flat tube 144 can extend in the left and right direction. Among them, a plurality of flat tubes 144 can be installed between the first header 143 and the second header 145. For example: the left end of each flat tube 144 can be connected to the right side of the first header 143, and the right end of each flat tube 144 can be connected to the left side of the second header 145, and at the same time, a plurality of flat tubes 144 can be spaced apart in the up and down direction.

[0058] Based on this, combining Figure 5 , Figure 5 is a partial structural schematic view of a heat exchanger 14 provided by the present application. The first header 143 can be provided with a flow dividing cavity 1461, and at least one through microchannel 1462 can be provided along the length direction of each flat tube 144, and the left end of each microchannel 1462 can be connected to the flow dividing cavity 1461, so that each flat tube 144 can communicate with the flow dividing cavity 1461. As Figure 6 shown, Figure 6 is Figure 4 a cross-sectional view of a part of the heat exchanger 14 shown in Figure 6 , the second header 145 can be provided with a first collecting cavity 1463, and the right end of each microchannel 1462 can be connected to the first collecting cavity 1463 in the second header 145 through the flat tube 144.

[0059] Therefore, when the heat exchanger 14 with the microchannel structure is applied to the outdoor heat exchanger 141, the first header 143 can be connected to the throttling device 13, and the second header 145 can be connected to the port C of the four-way valve 12. So that the two-phase refrigerant can be split through the split chamber 1461 in the first header 143, and then flow into the microchannels 1462 on the plurality of flat tubes 144, and after vaporizing and absorbing heat, it can flow into the first collection chamber 1463 in the second header 145. Subsequently, the refrigerant after evaporation and vaporization can flow into the compressor assembly 11 through the port C and port A of the four-way valve 12. Among them, compared with the finned heat exchanger, the first header 143, the flat tubes 144 and the second header 145 of the microchannel heat exchanger can be made of aluminum material. Since the aluminum material has a smaller density and a lower price compared with the common material, it is beneficial to significantly reduce the mass and production cost of the heat exchanger 14.

[0060] Since the flat tubes 144 in the microchannel heat exchanger are approximately strip-shaped sheet structures, rather than round tube structures similar to capillary tubes. Thus, when the microchannel heat exchanger 14 is used as the outdoor heat exchanger 141, if a flow splitting device 15 for adjusting the evenness of the two-phase refrigerant flow splitting needs to be installed between the throttling device 13 and the outdoor heat exchanger 141, the plurality of round tube-shaped liquid outlet ends of the flow splitting device 15 are not convenient to be directly connected to the flat tubes 144. Moreover, due to the structure of the flat tubes 144 being not convenient for repeated bending, and the connection operation of the ends of the two flat tubes 144 being relatively complex, the number of flat tubes 144 in the microchannel heat exchanger is much larger than the number of copper tubes in the finned heat exchanger. In this way, the connection operation between the larger number of flat tubes 144 and the plurality of liquid outlet ends of the flow splitting device 15 is more complex.

[0061] If the flow splitting device 15 is not installed between the throttling device 13 and the outdoor heat exchanger 141. Taking the outdoor heat exchanger 141 being the microchannel heat exchanger 14 as an example, when the air conditioner 100 is in the heating mode, during the process of the gas-liquid two-phase refrigerant flowing through the outdoor heat exchanger 141 (which is equivalent to an evaporator at this time), due to the inconsistent densities of the gas-phase refrigerant and the liquid-phase refrigerant, the gas-liquid two-phase refrigerant in the split chamber 1461 cannot flow evenly into the microchannels 1462 of each flat tube 144. Under the action of gravity, it will cause more liquid-phase refrigerant and less gas-phase refrigerant to flow through some flat tubes 144 (such as the flat tubes 144 near the lower part), and more gas-phase refrigerant and less liquid-phase refrigerant to flow through another part of the flat tubes 144 (such as the flat tubes 144 near the upper part). That is, the gas-liquid two-phase refrigerant in the plurality of flat tubes 144 cannot be evenly distributed. Since the liquid-phase refrigerant flow rate through the flat tubes 144 corresponding to some areas of the heat exchanger 14 is small, the heat transfer performance of this part of the heat exchanger area will be greatly reduced, resulting in the problem of reduced heat transfer efficiency at the outdoor heat exchanger 141.

[0062] Alternatively, a plurality of mutually isolated flow dividing chambers 1461 may be provided in the first header pipe 143, and each flow dividing chamber 1461 may communicate with a part of the flat pipes 144. In this way, the plurality of flow dividing outlet ends of the flow dividing device 15 may be respectively and correspondingly communicated with the plurality of flow dividing chambers 1461, so that the gas-liquid two-phase refrigerant after being divided by the flow dividing device 15 flows into each flow dividing chamber 1461, and then continues to be divided and flows into the microchannels 1462 of each flat pipe 144. However, when the gas-liquid two-phase refrigerant is divided into each flat pipe 144 in the flow dividing chamber 1461, under the action of gravity, more gaseous refrigerant will still flow into the part of the flat pipes 144 close to the upper part of each flow dividing chamber 1461, and more liquid refrigerant will correspondingly flow into the part of the flat pipes 144 close to the lower part of each flow dividing chamber 1461. As a result, the refrigerant flowing through the plurality of flat pipes 144 communicated with each flow dividing chamber 1461 cannot be evenly distributed, which will also reduce the heat exchange efficiency of the heat exchanger 14.

[0063] To solve the above problems, as Figure 2 shown, the air conditioner 100 provided in the embodiment of the present application may further include a two-phase distribution device 16. Referring to Figure 7 , Figure 7 is Figure 2 a front view of the connection and installation of the two-phase distribution device 16 shown in

[0064] As Figure 8 shown, Figure 8 is Figure 7A cross-sectional view of the two-phase distribution device 16 and the heat exchanger 14 shown. Exemplarily, the two-phase separator 161 has a separation chamber 1611, and the two-phase separator 161 may be sequentially provided with a first through hole 1612, a second through hole 1613, and a third through hole 1614 communicating with the separation chamber 1611 in the up and down directions. Thus, one end of the gas pipe 162 can be connected to the two-phase separator 161 so that the gas pipe 162 is connected to the first through hole 1612, and even the gas pipe 162 can be directly inserted into the first through hole 1612. And the other end of the gas pipe 162 can be inserted into the flow splitting chamber 1461 of the first header 143, and a gas spray hole 164 is opened downward at this end for spraying the gaseous refrigerant downward. Correspondingly, one end of the liquid pipe 163 can be connected to the two-phase separator 161 so that the liquid pipe 163 is connected to the third through hole 1614, and even the liquid pipe 163 can be directly inserted into the third through hole 1614. And the other end of the liquid pipe 163 can be inserted into the flow splitting chamber 1461 of the first header 143, and a liquid spray hole 165 is opened upward at this end for spraying the liquid refrigerant downward.

[0065] Among them, in the two-phase separator 161, since the density of the gaseous refrigerant in the two-phase refrigerant flowing into the separation chamber 1611 through the second through hole 1613 is small, and the density of the liquid refrigerant is large, under the action of gravity, after the two-phase refrigerant is separated in the separation chamber 1611. The gaseous refrigerant can fill the upper space of the separation chamber 1611, and can be sprayed downward into the flow splitting chamber 1461 through the first through hole 1612 and the gas pipe 162 by the gas spray hole 164. Correspondingly, the liquid refrigerant can fill the lower space of the separation chamber 1611, and can be sprayed upward into the flow splitting chamber 1461 through the third through hole 1614 and the liquid pipe 163 by the liquid spray hole 165.

[0066] Since one end of the gas pipe 162 inserted into the flow splitting chamber 1461 can be arranged close to the upper end of the flow splitting chamber 1461, and correspondingly, one end of the liquid pipe 163 inserted into the flow splitting chamber 1461 can be arranged close to the lower end of the flow splitting chamber 1461, and the gas spray hole 164 and the liquid spray hole 165 can be arranged facing each other. So that the liquid refrigerant sprayed out from the upward-opening liquid spray hole 165 can form a liquid filling area in the flow splitting chamber 1461 in the up and down directions, and correspondingly, the gaseous refrigerant sprayed out from the downward-opening gas spray hole 164 can form a gas filling area in the flow splitting chamber 1461 in the up and down directions. Under the action of gravity, since the density of the liquid refrigerant is greater than that of the gaseous refrigerant, that is, the liquid refrigerant will intersect and move downward with respect to the gaseous refrigerant, and correspondingly, the gaseous refrigerant will move upward with respect to the liquid refrigerant, so that the gaseous refrigerant in the gas filling area formed by downward spraying is more uniformly distributed, and correspondingly, the liquid refrigerant in the liquid filling area formed by upward spraying is also more uniformly distributed.

[0067] Based on this, the gas injection holes 164 and the liquid injection holes 165 can be arranged in a staggered manner in the up and down direction. In this way, the counteracting interference between the gas filling area and the liquid filling area can be reduced. Under the action of gravity, the uniformly distributed gas filling area and liquid filling area can enable the two-phase refrigerant to be uniformly mixed during the process of flowing into the microchannel 1462 along the length direction of the flat tube 144, which is beneficial to improving the heat exchange efficiency of the heat exchanger 14 at multiple flat tubes 144.

[0068] Exemplarily, as Figure 8 shown, a plurality of flat tubes 144 can be connected to the same side (such as the right side) of the first header 143, and the liquid injection holes 165 are located between the gas injection holes 164 and the plurality of flat tubes in the left and right direction. In this way, since the liquid filling area is located between the gas filling area and the plurality of flat tubes 144, under the extrusion of the gas filling area, it is convenient to squeeze the liquid refrigerant in the liquid filling area into the microchannel 1462 of each flat tube 144 and uniformly mix it with the gaseous refrigerant. So that the mixed gas-liquid two-phase refrigerant can be more uniformly distributed in the microchannels 1462 of the plurality of flat tubes 144, thereby improving the overall heat exchange efficiency of the heat exchanger 14.

[0069] In addition, for the staggered arrangement of the gas injection holes 164 and the liquid injection holes 165 in the flow distribution cavity 1461, the gas injection holes 164 can also be located between the liquid injection holes 165 and the plurality of flat tubes 144 in the left and right direction. Or, taking the example that a plurality of flat tubes 144 are connected to the right side of the first header 143, the central axes of the gas injection holes 164 and the liquid injection holes 165 can also be spaced apart in the front and back direction, and the central axes of the gas injection holes 164 and the liquid injection holes 165 can also satisfy the spaced distribution in both the left and right and the front and back directions at the same time. All satisfy the staggered distribution, that is, the non-aligned distribution, of the gas injection holes 164 and the liquid injection holes 165 in the up and down direction. The present application does not limit this.

[0070] As Figure 8 shown, in a flow distribution cavity 1461, taking the example that the gas injection holes 164, the liquid injection holes 165 and the plurality of flat tubes 144 are distributed in sequence from left to right. Among them, the width dimension of the first header 143 in the left and right direction is D. If the cross-section of the first header 143 in the direction perpendicular to the first straight line is a rectangular frame, the above width dimension is the width or length of the outer edge of the rectangular frame. If the cross-section of the first header 143 in the direction perpendicular to the first straight line is a circular ring, the above width dimension is the outer diameter of the circular ring. The central axes of the gas injection holes 164 and the liquid injection holes 165 can be set to be approximately parallel, and the distance between the central axes of the two is d1. It can be made that d1≥D / 3, that is, 3d1≥D, so that there can be sufficient space between the gas injection holes 164 and the liquid injection holes 165, thereby avoiding the counteracting interference between the gas filling area and the liquid filling area.

[0071] It should be noted that both the gas pipe 162 and the liquid pipe 163 can be configured as capillary tube structures, or other tube structures with a relatively small inner diameter, which is beneficial to increasing the flow velocity of the refrigerant fluid flowing through the gas pipe 162 and the liquid pipe 163. Exemplarily, when opening the gas injection holes 164, the aperture diameter of the gas injection holes 164 can be made smaller than or equal to the inner diameter of the gas pipe 162, so as to further increase the flow velocity of the gaseous refrigerant ejected from the gas injection holes 164, facilitating the formation of a gaseous filling region. Correspondingly, when opening the liquid injection holes 165, the aperture diameter of the liquid injection holes 165 can also be made smaller than or equal to the aperture diameter of the liquid pipe 163, so as to further increase the flow velocity of the liquid-phase refrigerant ejected from the liquid injection holes 165, facilitating the formation of a liquid filling region.

[0072] In some embodiments, if the shunt cavity 1461 has a relatively large distance in the up-down direction, that is, each shunt cavity 1461 is connected with a relatively large number of flat tubes 144 in the up-down direction, the aperture diameters of the gas injection holes 164 and the liquid injection holes 165 can be adjusted to be smaller, so that the refrigerant fluid can be ejected over a longer distance, which is beneficial to filling the internal space of the shunt cavity 1461 with the gaseous filling region and the liquid filling region in the up-down direction, facilitating the uniform mixing of the gas-liquid two-phase refrigerant. In addition, if the distance of the shunt cavity 1461 in the up-down direction is relatively small, the aperture diameters of the gas injection holes 164 and the liquid injection holes 165 can be correspondingly increased, so as to avoid a large amount of gaseous refrigerant concentrating in the lower space of the shunt cavity 1461, or a large amount of liquid-phase refrigerant concentrating in the upper space of the shunt cavity 1461. Among them, the aperture diameters of the gas injection holes 164 and the liquid injection holes 165 can also be slightly larger than the inner diameters of the gas pipe 162 and the liquid pipe 163, as long as the gas-liquid two-phase refrigerant flowing into the flat tubes 144 can be uniformly mixed, and there is no limitation on this.

[0073] Continue to refer to Figure 8 , in the left-right direction, define the maximum distance between the right end face of the gas pipe 162 and the left side of the first header pipe 143 as d2, and the maximum distance between the right end face of the liquid pipe 163 and the left side of the first header pipe 143 as d3. It can be made that d2 < D / 3 and D / 3 < d3 < 2D / 3, that is, 3d2 < D, and D < 3d3 < 2D. With such a setting, in the left-right direction, the right end of the gas pipe 162 can be located in the left region of the shunt cavity 1461, so that the right end opening of the liquid pipe 163 can be arranged close to the middle region of the shunt cavity 1461. At the same time, the left end openings of the multiple flat tubes 144 communicating with the first header pipe 143 can be arranged close to the right side of the shunt cavity 1461.

[0074] In some embodiments, if the right ends of multiple flat tubes 144 are partially inserted into the flow dividing chamber 1461 during the connection with the first header 143, the right ends of the multiple flat tubes 144 can be arranged close to the right side region of the flow dividing chamber 1461. That is, in the flow dividing chamber 1461, the gaseous filling region, the liquid filling region, and the openings at the right ends of the multiple flat tubes 144 can be sequentially distributed in the left-right direction. For example, the middle region of the flow dividing chamber 1461 in the left-right direction can be the region where the distance from the leftmost side of the first header 143 is between D / 3 and 2D / 3, and the region from 0 to D / 3 is the left side region, and the corresponding region from 2D / 3 to D can be the right side region. Even, the end face of the right end of the liquid tube 163 can be arranged close to the median line of the flow dividing chamber 1461. This is beneficial to the uniform mixing of the gas-liquid two-phase refrigerant.

[0075] It should be noted that in the embodiments of the present application, the specific structure of the two-phase separator 161 is not limited, as long as a separation chamber 1611 can be formed inside, and the first through hole 1612, the second through hole 1613, and the third through hole 1614 communicated with the separation chamber 1611 are provided, so that the gas-liquid two-phase refrigerant can flow into the separation chamber 1611 through the second through hole 1613 and gas-liquid separation occurs, and then most of the gaseous refrigerant can flow out through the first through hole 1612, and most of the liquid refrigerant can flow out through the third through hole 1614. The present application does not limit this.

[0076] Exemplarily, as Figure 9 shown, Figure 9 is Figure 8 the three-dimensional structure schematic diagram of the first two-phase separator 161 shown in. The two-phase separator 161 can be a box-like structure approximately in the shape of a rectangle, a prism, or even a cylinder. A separation chamber (not shown in the figure) can be formed inside the box-like structure, and the first through hole 1612 is opened on the upper side wall of the box-like structure, the third through hole (not shown in the figure) is opened on the lower side wall, and the second through hole 1613 can be opened on any side wall between the upper and lower side walls. In addition, the first through hole 1612, the second through hole 1613, and the third through hole can also be opened on any side wall, as long as the first through hole 1612, the second through hole 1613, and the third through hole are sequentially distributed from top to bottom. So as to continuously inject the two-phase refrigerant into the separation chamber 1611 through the second through hole 1613, and the gaseous refrigerant and the liquid refrigerant flow out through the first through hole 1612 and the third through hole 1614 respectively after the two-phase refrigerant is separated. The present application does not limit this.

[0077] In addition, as Figure 10 shown, Figure 10 is Figure 8Front cross-sectional view of the second two-phase separator 161 shown in the figure. The two-phase separator 161 can form a conical structure with two tips at the upper and lower ends. Exemplarily, the two-phase separator 161 can include a first conical shell 1615, a side plate shell 1616, and a second conical shell 1617 connected in sequence from top to bottom. The tip of the first conical shell 1615 can face upward, and the tip of the corresponding second conical shell 1617 can face downward, so that the tips of the two conical shells are away from each other. Among them, the first conical shell 1615 and the second conical shell 1617 can be approximately conical shells, and the side plate shell 1616 is a corresponding circular ring frame. Or, the first conical shell 1615 and the second conical shell 1617 can be approximately conical shells such as triangular pyramids or quadrangular pyramids, and the side plate shell 1616 can enclose a corresponding prism structure. So that the upper and lower edges of the side plate shell 1616 can be hermetically connected to the first conical shell 1615 and the second conical shell 1617 and enclose an internal separation chamber 1611. Among them, a first through hole 1612 can be opened on the first conical shell 1615 or even at the upper end of the first conical shell 1615, and a third through hole 1614 can be opened on the second conical shell 1617 or even at the lower end of the second conical shell 1617, and a second through hole 1613 can be opened at any position of the side plate shell 1616. So as to continuously inject the two-phase refrigerant into the separation chamber 1611 through the second through hole 1613, and after the two-phase refrigerant is separated, the gaseous refrigerant and the liquid refrigerant flow out through the first through hole 1612 and the third through hole 1614 respectively, and the present application does not limit this. Among them, the setting of the conical structures at the upper and lower ends facilitates the collection, separation, and outflow of the gaseous refrigerant and the liquid refrigerant.

[0078] Even, as Figure 11 shown, Figure 11 is Figure 8 Schematic three-dimensional structure diagram of the third two-phase separator 161 shown in the figure. The two-phase separator 161 can also be a communicating pipe structure similar to a tee joint. Since the tee joint has three connected interface ends, when the tee joint is placed in a suitable position, one interface end at the uppermost side can be the first through hole 1612, and one interface end at the lowermost side can be the third through hole 1614, that is, one interface end in the middle can be the second through hole 1613. And, since the three interface ends are connected, that is, the internal space connected by the first through hole 1612, the second through hole 1613, and the third through hole 1614 can be used as the separation chamber 1611 for accommodating and separating the gas-liquid two-phase refrigerant, and the structure is simple and effective.

[0079] When installing the two-phase distribution device 16, the two-phase separator 161 can be installed close to the first header pipe 143, or can be in contact with or even fit against the first header pipe 143 for installation. Exemplarily, if the first header pipe 143 is a circular pipe structure, then it can be in Figure 10A concave surface is provided on any side wall (except the side wall provided with the second through hole) of the two-phase separator 161 shown in the figure, so that the two-phase separator 161 can contact and even fit with the outer side wall of the first manifold 143 along the radial direction of the first manifold 143 through the concave surface. In addition, for Figure 11 the two-phase separator 161 with a conical structure shown in the figure, a concave surface can also be provided in the area of the side plate shell 1616 far from the second through hole 1613. Similarly, the two-phase separator 161 can contact and even fit with the outer side wall of the first manifold 143 along the radial direction of the first manifold 143 through the concave surface, which is convenient for the installation and connection of the two-phase separator 161.

[0080] In some embodiments, in order to improve the heat exchange efficiency of the heat exchanger 14, as Figure 4 shown, the heat exchanger 14 may further include a plurality of fins 147. Since the plurality of flat tubes 144 can be distributed at intervals in the up and down directions, at least one fin 147 can be installed between two adjacent flat tubes 144 so that the fin 147 can be in contact connection with the two flat tubes 144. For example, in Figure 4 the same fin 147 can be in contact connection with a plurality of or even all of the flat tubes 144 in the up and down directions, and the plurality of fins can be distributed at intervals in the left and right directions (i.e., the length direction of the flat tubes 144) to increase the contact area between the heat exchanger 14 and the air through the plurality of fins 147, which is beneficial to improving the heat exchange efficiency.

[0081] Or, as Figure 5 shown, along the up and down directions, one or more fins 147 can also be provided between two adjacent flat tubes 144. Taking the example that one fin 147 is provided between two adjacent flat tubes 144, the fin 147 can be bent to form a wavy structure extending in the left and right directions, and the multiple edges at the upper end of the fin 147 can be in contact connection with one flat tube 144 above, and the multiple edges at the lower end of the fin 147 can be in contact connection with one flat tube 144 below. Without reducing the ventilation volume, it is beneficial to improve the heat exchange efficiency of the heat exchanger 14. In addition, if there are multiple fins 147 between two adjacent flat tubes 144, the upper end of each fin 147 can be in contact connection with one flat tube 144 above, and the lower end of each fin 147 can be in contact connection with one flat tube 144 below, and the multiple fins 147 are distributed at intervals in the left and right directions, which is also beneficial to improving the heat exchange efficiency of the heat exchanger 14.

[0082] It should be noted that in the embodiments of the present application, the length direction of each flat tube 144 can be a straight line direction. For example, each flat tube 144 can extend along the left - right direction. Or, the length direction of the flat tube 144 can also form an obtuse or acute angle with the first straight line direction. In addition, the length direction of each flat tube 144 can also include a part of the straight line direction, the broken line direction, and the arc direction. For example, each flat tube 144 can first extend from left to right. After reaching a preset length, the flat tube 144 can be bent backward by a certain angle (such as a perpendicular bend), and then can continue to extend backward by a certain length, so as to adapt to an outdoor unit with air inlets in two directions. The present application does not limit this.

[0083] In some embodiments, as Figure 12 shown, Figure 12 is Figure 2 a simplified structural schematic diagram of the connection between the heat exchanger 14 and the two - phase distribution device 16 as shown. Among them, the first header 143 can be provided with a plurality of flow - dividing chambers 1461 in the up - down direction. For example, a plurality of flow - dividing chambers 1461 can be separated in the first header 143 by partition plates. And the number of the two - phase distribution devices 16 can be multiple and the same as the number of the flow - dividing chambers 1461, that is, they are arranged in one - to - one correspondence. In this way, the gas pipe 162 and the liquid pipe 163 of one two - phase distribution device 16 can be inserted into the same flow - dividing chamber 1461, and the gas pipe 162 in the same flow - dividing chamber 1461 is located above the liquid pipe 163. Since the second header 145 is provided with the first collecting chamber 1463, and each flow - dividing chamber 1461 can be communicated with the first collecting chamber 1463 through a plurality of flat tubes 144.

[0084] Based on this, referring to Figure 12 , a heat exchanger port 1464 communicating with the first collecting chamber 1463 can be opened in the second header 145. When the heat exchanger 14 is the outdoor heat exchanger 141 (as Figure 1 shown) and the air conditioner 100 is in the heating condition, the gas - liquid two - phase refrigerant flowing out of the indoor heat exchanger 142 can flow into a separation chamber 1611 through the second through - hole 1613 of each two - phase separator 161 (as Figure 8 shown). And the gas - liquid two - phase refrigerant can be gas - liquid separated in the separation chamber 1611 under the action of gravity, so that part of the gaseous refrigerant can flow into the flow - dividing chamber 1461 through the gas pipe 162 and spray downward, and the corresponding part of the liquid refrigerant can flow into the same flow - dividing chamber 1461 through the liquid pipe 163 and spray upward. Then, after being uniformly mixed, they enter each flat tube 144. And the gas - liquid two - phase refrigerant can vaporize and release a large amount of heat in the flat tube 144. Subsequently, the gaseous refrigerant can sequentially pass through the flat tube 144, the first collecting chamber 1463, the heat exchanger port 1464, and the four - way valve 12 and flow into the compressor assembly 11.

[0085] In addition, it is also possible to not provide the heat exchanger port 1464 on the second header pipe 145. Exemplarily, as Figure 13 shown, Figure 13 FIG. is a schematic diagram of another simplified structure of the heat exchanger 14 provided in the embodiment of the present application connected to the two-phase distribution device 16. The first header pipe 143 may further be provided with a plurality of second header cavities 1465, and the number of the second header cavities 1465 may be the same as the number of the shunt cavities 1461, and the first header pipe 143 may be provided with heat exchanger ports 1464 communicating with each second header cavity 1465 for communicating with the four-way valve 12 (as Figure 1 shown). Taking the number of both the second header cavity 1465 and the shunt cavity 1461 being two as an example, one shunt cavity 1461 and one second header cavity 1465 may be alternately distributed in the up-down direction, or the two header cavities 1465 may be located between the two shunt cavities 1461 in the up-down direction.

[0086] Continuing to refer to Figure 13 , the number of the first header cavities 1463 in the second header pipe 145 may be multiple and the same as the number of the shunt cavities 1461. The corresponding flat tubes 144 may include a plurality of first flat tubes 1441 and a plurality of second flat tubes 1442 distributed in the up-down direction. In this way, the shunt cavity 1461 may be connected to the left ends of the plurality of first flat tubes 1441, and one second header cavity 1465 may be connected to the left ends of the plurality of second flat tubes 1442. In this way, one first header cavity 1463 may communicate with an adjacent shunt cavity 1461 and one second header cavity 1465 through the plurality of first flat tubes 1441 and the plurality of second flat tubes 1442.

[0087] Based on this, referring to Figure 13 , when the heat exchanger 14 is an outdoor heat exchanger 141 (as Figure 1 shown) and the air conditioner 100 is in the heating condition, the gas-liquid two-phase refrigerant flowing out of the indoor heat exchanger 142 may pass through the second through hole 1613 of the uppermost two-phase separator 161 (as Figure 8flows into a separation chamber 1611 (as shown), and the gas-liquid two-phase refrigerant can be separated into gas and liquid in the separation chamber 1611 under the action of gravity, so that part of the gaseous refrigerant can flow into the shunt chamber 1461 through the gas pipe 162 and spray downward, and the corresponding part of the liquid refrigerant can flow into the same shunt chamber 1461 through the liquid pipe 163 and spray upward. Then, after uniform mixing, it enters multiple first flat tubes 1441, and the gas-liquid two-phase refrigerant can partially vaporize and release a large amount of heat in the first flat tubes 1441. Subsequently, the refrigerant can flow into the upper second flat tubes 1442 through the first flat tubes 1441 and the upper first manifold chamber 1463 in sequence, and can also vaporize and release heat in the second flat tubes 1442. Finally, the gaseous refrigerant can flow into the compressor assembly 11 through the second flat tubes 1442, the upper second manifold chamber 1465, the heat exchanger port 1464, and the four-way valve 12 in sequence.

[0088] It should be noted that when the number of the shunt chambers 1461 and the second manifold chambers 1465 is greater than or equal to three. Taking the number of both the shunt chambers 1461 and the second manifold chambers 1465 being four as an example, one shunt chamber 1461 and one second manifold chamber 1465 can be alternately distributed in the vertical direction. In addition, one shunt chamber 1461, two second manifold chambers 1465, two shunt chambers 1461, and one second manifold chamber 1465 can also be arranged in sequence from top to bottom. When the number of the shunt chambers 1461 and the second manifold chambers 1465 is larger, it can be analogized by referring to the above method. For example, one shunt chamber 1461, two second manifold chambers 1465, two shunt chambers 1461, two second manifold chambers 1465, two shunt chambers 1461, and one second manifold chamber 1465 can be arranged in sequence from top to bottom. The relative positional relationship between the shunt chambers 1461 and the second manifold chambers 1465 can also be adjusted, and all can meet the arrangement method of the shunt chambers and the second manifold chambers being alternately distributed in the vertical direction. The present application does not limit this.

[0089] Among them, the description of the uniform mixing process of the gas-liquid two-phase refrigerant by the heat exchanger 14 in the operation process of the embodiment of the present application can achieve the above effects when the outdoor heat exchanger 141 is applied under the heating condition, and can also achieve the above effects when the indoor heat exchanger 142 is applied under the cooling condition. The present application does not limit this.

[0090] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0091] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioner, characterized in that, Comprising: A heat exchanger, including a first header and a plurality of flat tubes; The plurality of flat tubes are spaced apart along a first linear direction, the length direction of each flat tube intersects the first linear direction, and one ends of the plurality of flat tubes are connected to the first header; and, At least one two-phase distribution device, including a two-phase separator, a gas pipe and a liquid pipe; the two-phase separator is provided with a separation chamber, and the two-phase separator is further sequentially provided with a first through hole, a second through hole and a third through hole communicating with the separation chamber along the first linear direction; one end of the gas pipe is connected to the first through hole, the other end is inserted into the first header and is provided with a gas injection hole; one end of the liquid pipe is connected to the third through hole, the other end is inserted into the first header and is provided with a liquid injection hole, and the gas injection hole and the liquid injection hole are arranged in a staggered manner; along the first linear direction, the gas pipe and the liquid pipe are located on opposite sides of the connected two-phase separator, and the gas injection hole and the liquid injection hole are arranged facing each other.

2. The air conditioner according to claim 1, characterized in that Inside the first header, along the length direction of the flat tubes, the plurality of flat tubes are connected to the same side of the first header, and the liquid injection holes are spaced between the gas injection holes and the flat tubes.

3. The air conditioner according to claim 2, characterized in that, Along the length direction of the flat tubes, the width dimension of the first header is D, the distance between the central axes of the gas injection hole and the liquid injection hole is d1, and 3d1≥D is satisfied.

4. The air conditioner according to claim 3, characterized in that, Along the length direction of the flat tubes, the maximum distance between the end face of the gas pipe close to the flat tubes and the side of the first header away from the flat tubes is d2, the maximum distance between the end face of the liquid pipe close to the flat tubes and the side of the first header away from the flat tubes is d3, and 3d2<D, D<3d3<2D are satisfied.

5. The air conditioner according to claim 1, wherein Both the gas pipe and the liquid pipe are capillary structures; The aperture of the gas injection hole is less than or equal to the inner diameter of the gas pipe; and / or, The aperture of the liquid injection hole is less than or equal to the inner diameter of the liquid pipe.

6. The air conditioner according to claim 1, wherein Along the first linear direction, the two-phase separator includes a first conical shell, a side plate shell and a second conical shell connected in sequence, and the tips of the first conical shell and the second conical shell are away from each other; the first through hole is opened at the end of the first conical shell away from the second conical shell, the second through hole is opened on the side plate shell, and the third through hole is opened at the end of the second conical shell away from the first conical shell; and / or, The first header is a circular tube structure, and along the radial direction of the first header, the two-phase separator is provided with a concave surface in contact with the first header.

7. The air conditioner according to claim 1, characterized in that, The two-phase separator is a three-way joint.

8. The air conditioner according to any one of claims 1 to 7, characterized in that, The first header is provided with a plurality of flow distribution chambers, and the number of the two-phase distribution devices is multiple; each flow distribution chamber communicates with the plurality of flat tubes, the plurality of flow distribution chambers are arranged in one-to-one correspondence with the plurality of two-phase distribution devices, the gas pipe and the liquid pipe of one two-phase distribution device are inserted into the same flow distribution chamber, and the gas pipe in the same flow distribution chamber is located above the liquid pipe along the first linear direction; The heat exchanger further includes a second header pipe, the second header pipe is provided with a first header chamber, and each of the flow dividing chambers is communicated with the first header chamber through a plurality of the flat pipes.

9. The air conditioner according to claim 8, characterized in that, The first header pipe is further provided with a plurality of second header chambers, the number of the second header chambers is the same as that of the flow dividing chambers, and the flow dividing chambers and the second header chambers are alternately distributed along the first straight line direction. Each of the second header chambers is used for communicating with the four-way valve of the air conditioner. The flat pipes include a plurality of first flat pipes and a plurality of second flat pipes distributed along the first straight line direction. One of the flow dividing chambers is connected to one ends of the plurality of first flat pipes, and one of the second header chambers is connected to one ends of the plurality of second flat pipes. The number of the first header chambers is multiple and the same as that of the flow dividing chambers, and one of the first header chambers is communicated with an adjacent flow dividing chamber and an adjacent second header chamber through a plurality of the first flat pipes and a plurality of the second flat pipes.

10. The air conditioner according to any one of claims 1 to 7, characterized in that, Each of the flat pipes is provided with a plurality of microchannels, and one of the microchannels penetrates through the flat pipe along the length direction of the flat pipe for the circulating flow of the refrigerant. The heat exchanger further includes a plurality of fins. Along the first straight line direction, at least one of the fins is installed between two adjacent flat pipes, and the fin is in contact connection with the two adjacent flat pipes.

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