Air conditioner outdoor unit and air conditioner system

Abstract

The utility model discloses an air conditioner outdoor unit and an air conditioner system. The air conditioner outdoor unit comprises an outdoor heat exchanger and a preset metal pipeline which is connected with the outdoor heat exchanger and used for transmitting refrigerants. The outdoor heat exchanger comprises an aluminum pipeline, the aluminum pipeline comprises a heat exchange pipe, a first refrigerant inlet and outlet pipe section and a second refrigerant inlet and outlet pipe section, the first refrigerant inlet and outlet pipe section and the second refrigerant inlet and outlet pipe section are connected with the heat exchange pipe, the first refrigerant inlet and outlet pipe section is arranged on the lower portion of the outdoor heat exchanger, and the second refrigerant inlet and outlet pipe section is arranged on the upper portion of the outdoor heat exchanger. The preset metal pipeline comprises a first transition pipe section, and the first transition pipe section comprises a transverse pipe section and a vertical pipe section; the first refrigerant inlet and outlet pipe section comprises a first linear pipe section connected with the transverse pipe section, the transverse pipe section comprises a second linear pipe section connected with the first linear pipe section, and the first linear pipe section is not lower than the second linear pipe section. According to the technical scheme, the problem that the refrigerant inlet and outlet pipeline located below the heat exchanger in the air conditioning system is prone to corrosion can be solved.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and more specifically, to an outdoor unit of an air conditioner and an air conditioning system. Background Technology

[0002] With the development of air conditioning technology and the comparison of metal raw material resources, aluminum tube heat exchangers have developed rapidly and are gradually replacing copper tube heat exchangers.

[0003] In air conditioning systems, aluminum tube heat exchangers need to be connected to other metal pipes in the system, such as copper pipes. One of the refrigerant transfer ports in the heat exchanger is located at the bottom of the heat exchanger, and this bottom-positioned refrigerant transfer pipe is connected to the copper pipe above. However, due to the high reactivity of aluminum, if there is water on the copper pipe, the water will flow to the connected aluminum pipe, and the copper ions in the water will cause electrochemical corrosion of the aluminum. Utility Model Content

[0004] This utility model provides an outdoor air conditioning unit and an air conditioning system to solve the problem of water flowing from the metal pipes in the air conditioning system to the refrigerant transmission pipe located at the bottom of the aluminum tube heat exchanger, causing corrosion to the refrigerant transmission pipe.

[0005] An embodiment of this application provides an outdoor unit for an air conditioner, including: an outdoor heat exchanger and a predetermined metal pipe connected to the outdoor heat exchanger for transmitting refrigerant;

[0006] The outdoor heat exchanger includes an aluminum pipeline for transmitting refrigerant. The aluminum pipeline includes a heat exchange tube and a first refrigerant inlet / outlet pipe section and a second refrigerant inlet / outlet pipe section connected to the heat exchange tube. The first refrigerant inlet / outlet pipe section is located at the lower part of the outdoor heat exchanger, and the second refrigerant inlet / outlet pipe section is located at the upper part of the outdoor heat exchanger.

[0007] The predetermined metal pipeline includes a first transition pipe section, which includes a horizontal pipe section connected to the first refrigerant inlet / outlet pipe section and a vertical pipe section that bends upward relative to the horizontal pipe section.

[0008] The first refrigerant inlet / outlet pipe section includes a first straight pipe section connected to the horizontal pipe section, and the horizontal pipe section includes a second straight pipe section connected to the first straight pipe section. The first straight pipe section is not lower than the second straight pipe section.

[0009] In one embodiment, the portion where the first refrigerant inlet / outlet pipe section connects to the first transition pipe section is covered with heat shrink tubing.

[0010] In one embodiment, one end of the first transition pipe section is configured to be inserted into the first refrigerant inlet / outlet pipe section and welded in place.

[0011] In one embodiment, the predetermined metal conduit is a copper conduit or a stainless steel conduit.

[0012] In one embodiment, the predetermined metal pipeline further includes a first connecting pipe section connected to the first transition pipe section, the first connecting pipe section having an inverted U-shaped structure.

[0013] In one embodiment, the predetermined metal pipeline includes a second transition pipe section, the second refrigerant inlet / outlet pipe section is configured to extend from top to bottom, the second transition pipe section is a U-shaped pipe section with both ends facing upwards, and one end of the second transition pipe section is connected to the downward-facing end of the second refrigerant inlet / outlet pipe section.

[0014] In one embodiment, the portion where the second refrigerant inlet / outlet pipe section connects to the second transition pipe section is covered with heat shrink tubing.

[0015] In one embodiment, one end of the second transition pipe section is configured to be inserted into the second refrigerant inlet / outlet pipe section and welded in place.

[0016] In one embodiment, the predetermined metal pipeline further includes a second connecting pipe section connected to the second transition pipe section, wherein one end of the second connecting pipe section is configured to be inserted downward into the second transition pipe section for connection, and the other end is configured to be connected upward to a downward port of the four-way valve.

[0017] Embodiments of this application also provide an air conditioning system, including an indoor air conditioning unit and an outdoor air conditioning unit as described above.

[0018] In the technical solution provided by the embodiments of this application, the first transition pipe section connected to the first refrigerant inlet / outlet pipe section is set as an L-shaped structure including a horizontal pipe section and a vertical pipe section, and the first straight pipe section of the first refrigerant inlet / outlet pipe section is not lower than the second straight pipe section of the horizontal pipe section. In this way, when connected to other predetermined metal pipes above through the vertical pipe section, the horizontal pipe section can prevent water on the predetermined metal pipes above from flowing down the first transition pipe section to the first refrigerant inlet / outlet pipe section and corroding the aluminum pipes. This solves the problem that the first refrigerant inlet / outlet pipe section, which is an aluminum pipe, is located at the lower part of the outdoor heat exchanger and is easily corroded by water flowing down from the predetermined metal pipes above.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0021] Figure 1 This is a schematic diagram of the structure of an outdoor unit of an air conditioner according to one embodiment of this application;

[0022] Figure 2 for Figure 1 An enlarged schematic diagram of the outdoor unit of the air conditioner at point M;

[0023] Figure 3 This is a partial structural diagram of an air conditioner outdoor unit according to one embodiment of this application;

[0024] Figure 4 This is a partial structural diagram of an air conditioner outdoor unit according to one embodiment of this application;

[0025] Figure 5 for Figure 4 A schematic diagram of the flow path of some of the pipelines;

[0026] Figure 6 This is a partial structural diagram of an air conditioner outdoor unit according to one embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Outdoor heat exchanger; 11-First refrigerant inlet / outlet pipe section; 111-First straight pipe section; 12-Second refrigerant inlet / outlet pipe section; 13-First branch pipe section; 14-Combination pipe section; 15-Second branch pipe section; 16-Heat exchange tube; 17-First transition pipe section; 171-Horizontal pipe section; 1711-Second straight pipe section; 172-Vertical pipe section; 18-Second transition pipe section; 2-Compressor; 3-Four-way valve; 4-Stop valve; 51-First connecting pipe section; 52-Second connecting pipe section; 53-Third connecting pipe section; 54-Fourth connecting pipe section; 55-First tee pipe; A-First port; B-Second port; C-Third port; 56-Second tee pipe; D-Fourth port; E-Fifth port; F-Sixth port; 6-Expansion valve; 7-Filter; 8-One-way valve; 10-Shell; 101-Ventilation port. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0030] Embodiments of this application provide an outdoor unit for an air conditioner, such as... Figures 1-3 As shown, it includes: an outdoor heat exchanger 1 and a predetermined metal pipeline connected to the outdoor heat exchanger 1 for transmitting refrigerant; the outdoor heat exchanger 1 includes an aluminum pipeline for transmitting refrigerant, the aluminum pipeline includes a heat exchange tube 16 and a first refrigerant inlet / outlet pipe section 11 and a second refrigerant inlet / outlet pipe section 12 connected to the heat exchange tube 16, the first refrigerant inlet / outlet pipe section 11 is located at the lower part of the outdoor heat exchanger 1, and the second refrigerant inlet / outlet pipe section 12 is located at the upper part of the outdoor heat exchanger 1.

[0031] The predetermined metal conduit includes a first transition section 17, which comprises a horizontal section 171 connected to a first refrigerant inlet / outlet section 11 and a vertical section 172 bent upwards relative to the horizontal section 171, i.e., the first transition section 17 has an L-shaped structure. The first refrigerant inlet / outlet section 11 includes a first straight section 111 connected to the horizontal section 171, and the horizontal section 171 includes a second straight section 1711 connected to the first straight section 111. The first straight section 111 is not lower than the second straight section 1711. The statement that the first straight section 111 is not lower than the second straight section 1711 refers to the centerline of the section; the centerline of the first straight section 111 is not lower than the centerline of the second straight section 1711. The first straight section 111 and the second straight section 1711 can both be horizontally arranged, or the direction from the first straight section 111 to the second straight section 1711 can be inclined downwards.

[0032] The intended metal piping in air conditioning systems is typically made of metals with good thermal conductivity and lower reactivity than aluminum. The higher the reactivity of a metal, the easier it is to lose electrons and form cations, i.e., the easier it is to produce a reaction. For example, aluminum is more reactive than copper, and aluminum easily loses electrons to replace copper ions. Therefore, the intended metal piping is usually made of copper, but it can also be made of stainless steel or other metals with lower reactivity than aluminum. In this application, "made of aluminum" refers to piping made of aluminum or aluminum alloys; similarly, "made of copper" refers to piping made of copper or copper alloys.

[0033] In the technical solution provided by the embodiments of this application, the first transition pipe section 17 connected to the first refrigerant inlet / outlet pipe section 11 is set as an L-shaped structure including a horizontal pipe section 171 and a vertical pipe section 172, and the first straight pipe section 111 of the first refrigerant inlet / outlet pipe section 11 is not lower than the second straight pipe section 1711 of the horizontal pipe section 171. In this way, when connected to other predetermined metal pipes above through the vertical pipe section 172, the horizontal pipe section 171 can prevent the predetermined metal pipes above from flowing along the first transition pipe section 17 to the first refrigerant inlet / outlet pipe section 11 and corroding the first refrigerant inlet / outlet pipe section 11. This solves the problem that the first refrigerant inlet / outlet pipe section 11, which is an aluminum pipe, is located at the lower part of the outdoor heat exchanger 1 and is easily corroded by water flowing down from the predetermined metal pipes above.

[0034] In one embodiment, such as Figure 6 As shown, the predetermined metal pipeline also includes a second transition section 18. The second refrigerant inlet / outlet section 12 is configured to extend from top to bottom, and the second transition section 18 is a U-shaped section with both ends facing upwards. One end of the second transition section 18 is connected to the downward-facing end of the second refrigerant inlet / outlet section 12, and the other end of the second transition section 18 is connected to other predetermined metal pipelines. In this way, water from other predetermined metal pipelines will not flow onto the second refrigerant inlet / outlet section 12, thus preventing corrosion of the aluminum pipeline.

[0035] In one embodiment, the connection between the first refrigerant inlet / outlet pipe section 11 and the first transition pipe section 17 is covered with heat shrink tubing. Similarly, the connection between the second refrigerant inlet / outlet pipe section 12 and the second transition pipe section 18 is covered with heat shrink tubing. Covering with heat shrink tubing provides more effective protection at the connection points between the aluminum pipes and the intended metal pipes.

[0036] In one embodiment, aluminum has a lower melting point than the predetermined metal pipe (e.g., copper pipe or stainless steel pipe) of the air conditioning system. During welding, the predetermined metal pipe can be inserted into the aluminum pipe for welding. That is, one end of the first transition pipe section 17 is inserted into the first refrigerant inlet / outlet pipe section 11 for welding, and one end of the second transition pipe section 18 is inserted into the second refrigerant inlet / outlet pipe section 12 for welding.

[0037] To facilitate the connection between the outdoor heat exchanger 1 and the predetermined metal pipeline, the first transition pipe section 17 and the second transition pipe section 18 can be pre-welded to the outdoor heat exchanger 1. Then, when assembling the outdoor air conditioning unit, the first transition pipe section 17 and the second transition pipe section 18 on the outdoor heat exchanger 1 are welded to the other predetermined metal pipelines of the outdoor air conditioning unit 1 respectively. Welding of the same material is easier to implement on the assembly site, which helps to improve assembly efficiency.

[0038] In one embodiment, such as Figures 1-3 As shown, the predetermined metal conduit also includes a first connecting pipe section 51 connected to the first transition pipe section 17. The first connecting pipe section 51 has an inverted U-shaped structure, with one end of the inverted U-shaped pipe section inserted into the upper end of the vertical pipe section 172 and welded to the vertical pipe section 172. In this way, the annular gap between the outer periphery of the vertical pipe section 172 and the first connecting pipe section 51 can accommodate the solder to facilitate welding. Moreover, the first connecting pipe section 51 can avoid the space below by bending upwards and then downwards to connect with other pipes.

[0039] It should be noted that the “inverted U-shaped pipe segment” described in this application refers to a pipe segment with both ends facing downwards, and the “U-shaped pipe segment” described refers to a pipe segment with both ends facing upwards. The shape of the pipe between the two ends is not limited.

[0040] In one embodiment, the predetermined metal conduit further includes a second connecting pipe section 52, which is configured to connect to the end of the second transition pipe section 18 that is away from the second refrigerant inlet / outlet pipe section 12. Figure 3 and Figure 5 In the example, the second refrigerant inlet / outlet pipe section 12 is configured to extend from top to bottom, the second transition pipe section 18 is a U-shaped pipe section with the opening facing upwards, and one end of the second transition pipe section 18 is connected to the downward-facing end of the second refrigerant inlet / outlet pipe section 12.

[0041] One end of the second connecting pipe section 52 is configured to be inserted downwards into the end of the second transition pipe section 18 furthest from the second refrigerant inlet / outlet pipe section 12 and welded thereon. The other end of the second connecting pipe section 52 is configured to be connected upwards to one of the downward-facing ports of the four-way valve 3, allowing the port of the four-way valve 3 to be inserted into the port of the second connecting pipe section 52 for welding. Similarly, the upward-facing pipe section is positioned on the outside to accommodate solder within the port for easier welding.

[0042] In one embodiment, such as Figures 1-3 As shown, the heat exchange tube 16 of the outdoor heat exchanger 1 is connected to a plurality of first branch pipe sections 13 and a plurality of second branch pipe sections 15. One of the first branch pipe sections 13 and the second branch pipe sections 15 is configured to supply refrigerant to the heat exchange tube 16, and the other is configured to receive the refrigerant flowing out of the heat exchange tube 16.

[0043] Multiple first branch pipe sections 13 are connected to a manifold section 14, which is connected to one end of a heat exchange pipe 16 located at the bottom. The first refrigerant inlet / outlet pipe section 11 is connected to the other end of the heat exchange pipe 16 at the bottom, so that the first refrigerant inlet / outlet pipe section 11 can extend from below the outdoor heat exchanger 1. Multiple second branch pipe sections 15 are connected to the second refrigerant inlet / outlet pipe section 12.

[0044] The outdoor heat exchanger 1 is equipped with multiple heat exchange tubes 16, each of which can be U-shaped, S-shaped, or other shapes. Each first branch pipe section 13 can branch the refrigerant at the refrigerant outlet (or refrigerant inlet) corresponding to one or more heat exchange tubes 16, and each second branch pipe section 15 can branch the refrigerant at the refrigerant inlet (or refrigerant outlet) corresponding to one or more heat exchange tubes 16. For example, when the first refrigerant inlet / outlet pipe section 11 serves as the refrigerant outlet and the second refrigerant inlet / outlet pipe section 12 serves as the refrigerant inlet, such as... Figures 1-3 As shown, the refrigerant provided by the second refrigerant metal pipe section 12 is supplied to multiple heat exchange tubes 16 through multiple second branch pipe sections 15. The refrigerant output from the multiple heat exchange tubes 16 is first transported to the manifold section 14 through multiple first branch pipe sections 13, and then enters the bottom heat exchange tube from the manifold section 14 and is output from the first refrigerant inlet and outlet pipe section 11.

[0045] exist Figures 1-3In this embodiment, the first refrigerant inlet / outlet pipe section 11 is connected to the pipe connected to the shut-off valve 4 of the outdoor unit of the air conditioner. The shut-off valve 4 is a valve that controls the opening and closing of the refrigerant pipe between the outdoor unit and the air conditioner. The second refrigerant inlet / outlet pipe section 12 is connected to a four-way valve 3. When the air conditioning system is in cooling mode, the high-temperature and high-pressure refrigerant compressed by the compressor 2 flows from the four-way valve 3 to the heat exchange tube 16 of the outdoor heat exchanger 1. After heat exchange in the outdoor heat exchanger 1, the refrigerant flows from the heat exchange tube 16 to multiple first branch pipe sections 13, and from the manifold section 14 to the first refrigerant inlet / outlet pipe section 11, flows through the shut-off valve 4, and then flows to the indoor unit of the air conditioner. In heating mode, the refrigerant enters the outdoor heat exchanger 1 from the first refrigerant inlet / outlet pipe section 11 and multiple first branch pipe sections 13. After heat exchange, it flows out of the outdoor heat exchanger 1 from multiple second branch pipe sections 15 and the second refrigerant inlet / outlet pipe section 12.

[0046] In one embodiment, the outdoor air conditioner is configured with top ventilation, such as... Figure 1 As shown, the outdoor air conditioner has a vent 102 on the top of its casing 10. For outdoor air conditioners with a top vent 102, outdoor dust and metal ions in rainwater can easily cause electrochemical corrosion to the aluminum pipes of the outdoor heat exchanger 1. Therefore, at least some of the pipes in the first branch pipe section 13, the second branch pipe section 15, the manifold pipe section 14, the first refrigerant inlet / outlet pipe section 11, and the second refrigerant inlet / outlet pipe section 12 can be provided with an anti-corrosion layer. Specifically, zinc plating can be used as an anti-corrosion layer on the aluminum pipes. The anti-corrosion layer can be a zinc plating layer, or other chemical coatings can be used.

[0047] In one embodiment, such as Figures 3-5 As shown, the outdoor unit of the air conditioner also includes a high-pressure valve assembly, which includes a first three-way pipe 55, a second three-way pipe 56, a first three-way connecting pipe 53, a fourth connecting pipe 54, a shut-off valve 4, a one-way valve 6, a filter 7, and an expansion valve 8.

[0048] The first tee pipe 55 has a first port A, a second port B, and a third port C; the second tee pipe 56 has a fourth port D, a fifth port E, and a sixth port F; the first port A is connected to the first connecting pipe section 51; a third connecting pipe section 53 is connected between the second port B and the fifth port E; a fourth connecting pipe section 54 is connected between the third port C and the sixth port F; the fourth port D is configured to connect to the shut-off valve 4; a one-way valve 6 is provided on the third connecting pipe section 53, and the one-way valve 6 is configured to allow refrigerant to flow only in the direction of the shut-off valve 4; a filter 7 and an expansion valve 8 are provided on the fourth connecting pipe section 54, and filters 7 can be provided on both sides of the expansion valve 8.

[0049] Figure 4In the example, the first port A of the first three-way pipe 55 is arranged upward, and the end of the first connecting pipe section 51 of the inverted U-shaped structure, which is far from the first transition pipe section 17, is inserted downward into the first port A and welded and fixed.

[0050] When the air-conditioning system adopts the refrigeration mode, the refrigerant flows according to the Figure 5 flow direction in, and the refrigerant of the outdoor heat exchanger 1 mainly flows from the third connecting pipe section 53 to the stop valve 4 through the one-way valve 8, and then flows to the indoor unit; when the heating mode is adopted, the refrigerant flows reversely, and the refrigerant flows through the stop valve 4 to the fourth connecting pipe section 54 and is throttled by the expansion valve 8. The specific working principles of the air-conditioning system for refrigeration and heating are not specifically described here.

[0051] The embodiment of the present application further provides an air-conditioning system, including an air-conditioning indoor unit and the air-conditioning outdoor unit as described above.

[0052] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "up", "down", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "perimeter", "the structure of the character 'kou'" and the like is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0053] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", "fixed connection" can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0054] Although the disclosed embodiments of the present utility model are as above, the content described is only the embodiments adopted for the convenience of understanding the present utility model, and is not used to limit the present utility model. Any person skilled in the art within the scope of the present utility model can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present utility model. However, the scope of patent protection of the present utility model shall still be defined by the appended claims.

Claims

1. An outdoor unit for an air conditioner, characterized in that, include: An outdoor heat exchanger and a predetermined metal pipeline connected to the outdoor heat exchanger for transmitting refrigerant. The outdoor heat exchanger includes an aluminum pipeline for transmitting refrigerant. The aluminum pipeline includes a heat exchange tube and a first refrigerant inlet / outlet pipe section and a second refrigerant inlet / outlet pipe section connected to the heat exchange tube. The first refrigerant inlet / outlet pipe section is located at the lower part of the outdoor heat exchanger, and the second refrigerant inlet / outlet pipe section is located at the upper part of the outdoor heat exchanger. The predetermined metal pipeline includes a first transition pipe section, which includes a horizontal pipe section connected to the first refrigerant inlet / outlet pipe section and a vertical pipe section that bends upward relative to the horizontal pipe section. The first refrigerant inlet / outlet pipe section includes a first straight pipe section connected to the horizontal pipe section, and the horizontal pipe section includes a second straight pipe section connected to the first straight pipe section. The first straight pipe section is not lower than the second straight pipe section.

2. The air conditioner outdoor unit according to claim 1, characterized by The portion where the first refrigerant inlet / outlet pipe section connects to the first transition pipe section is covered with heat shrink tubing.

3. The air conditioner outdoor unit according to claim 1, characterized by One end of the first transition pipe section is configured to be inserted into the first refrigerant inlet / outlet pipe section and welded in place.

4. The air conditioner outdoor unit according to claim 1, characterized by The predetermined metal pipeline also includes a first connecting pipe section connected to the first transition pipe section, and the first connecting pipe section has an inverted U-shaped structure.

5. The air conditioner outdoor unit according to claim 1, characterized by The predetermined metal pipeline is a copper pipeline or a stainless steel pipeline.

6. The air conditioner outdoor unit according to any one of claims 1-5, characterized in that, The predetermined metal pipeline includes a second transition pipe section. The second refrigerant inlet / outlet pipe section is configured to extend from top to bottom. The second transition pipe section is a U-shaped pipe section with both ends facing upwards. One end of the second transition pipe section is connected to the downward-facing end of the second refrigerant inlet / outlet pipe section.

7. The air conditioner outdoor unit according to claim 6, characterized by The section where the second refrigerant inlet / outlet pipe section connects to the second transition pipe section is covered with heat shrink tubing.

8. The air conditioner outdoor unit according to claim 6, characterized by One end of the second transition pipe section is configured to be inserted into the second refrigerant inlet / outlet pipe section and welded in place.

9. The air conditioner outdoor unit according to claim 6, characterized by The predetermined metal pipeline also includes a second connecting pipe section connected to the second transition pipe section. One end of the second connecting pipe section is configured to be inserted downward into the second transition pipe section, and the other end is configured to be connected upward to a downward port of the four-way valve.

10. An air conditioning system, characterized in that, It includes an indoor air conditioning unit and an outdoor air conditioning unit according to any one of claims 1-9.

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