Air conditioner outdoor unit exhaust pipe assembly and air conditioner

Abstract

The application provides an exhaust pipe assembly of an air conditioner outdoor unit and an air conditioner, the air conditioner outdoor unit comprising a compressor assembly, an oil separator, the compressor assembly comprising a first compressor and a second compressor; the exhaust pipe assembly is communicated with an exhaust port of the first compressor, an exhaust port of the second compressor and an inlet of the oil separator; in a top view, a line connecting a center of the first compressor and a center of the oil separator is recorded as a third line, a line connecting the center of the first compressor and a center of the second compressor is recorded as a second line, and a line connecting the center of the second compressor and the center of the oil separator is recorded as a first line; the length of the first line is greater than the length of the second line, and the length of the third line is greater than the length of the second line; the exhaust pipe assembly is arranged in order in the application, the excessively long refrigerant pipeline is avoided, and the transportation damage risk of the pipeline and related parts is reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an exhaust pipe assembly for an outdoor unit of an air conditioner and an air conditioner. Background Technology

[0002] Air conditioners are indispensable electrical appliances in people's daily lives and come in a variety of structural forms. With the continuous improvement of industrial design and the application of new technologies, materials, and shapes in air conditioners, not only have various types of indoor air conditioner units been developed, but the outdoor units have also undergone corresponding structural optimization.

[0003] Taking the outdoor unit structure of a multi-split air conditioner as an example, the outdoor unit of a multi-split air conditioner often contains a large number of components, and may even have at least two refrigerant systems, such as two compressors, along with corresponding gas separators, oil separators, four-way valves, shut-off valves, condensers, and other components. In existing technology, for conventional multi-split air conditioner outdoor units, due to the large number of refrigerant system components, the internal refrigerant piping, such as the exhaust pipe assembly, return pipe assembly, and four-way valve assembly, is often not optimized in its layout. This results in a messy and disordered piping layout inside the multi-split air conditioner outdoor unit, leading to low space utilization and increasing the difficulty of assembly and maintenance, thus hindering the convenience of disassembly and repair. Furthermore, in addition to the messy and disordered refrigerant piping layout, existing multi-split air conditioner outdoor units often have some excessively long refrigerant pipes, increasing the risk of damage to the piping structure and related components during transportation. Summary of the Invention

[0004] In view of this, the present invention aims to provide an exhaust pipe assembly for an air conditioner outdoor unit and an air conditioner, addressing the issue of the disorderly and unordered layout of the exhaust pipe assembly in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] An exhaust pipe assembly for an outdoor unit of an air conditioner, the outdoor unit including a compressor assembly and an oil separator, the compressor assembly including a first compressor and a second compressor; the exhaust pipe assembly is connected to the exhaust port of the first compressor, the exhaust port of the second compressor, and the inlet of the oil separator. From a top-down view, the line connecting the center of the first compressor and the center of the oil separator is designated as the third line, the line connecting the center of the first compressor and the center of the second compressor as the second line, and the line connecting the center of the second compressor and the center of the oil separator as the first line. The length of the first line is greater than or equal to the length of the second line, and the length of the third line is greater than or equal to the length of the second line. By arranging the first compressor, the second compressor, and the oil separator in a triangular configuration, a spatial constraint is provided for the orderly arrangement of the exhaust pipe assembly; simultaneously, the arrangement of the first compressor, the second compressor, and the oil separator is made as compact as possible, which helps to avoid a scattered layout of the exhaust pipe assembly and improves the compactness of the exhaust pipe assembly layout.

[0007] Preferably, the first, second, and third connecting lines form a triangle. The exhaust pipe assembly includes an exhaust tee, which is connected to the exhaust port of the first compressor, the exhaust port of the second compressor, and the inlet of the oil separator. From a top-view perspective, the exhaust tee is positioned within the triangle. As a component connecting the first compressor, the second compressor, and the oil separator, positioning the exhaust tee within the triangle facilitates the approximate equal length of the relevant refrigerant pipelines, avoids excessively long refrigerant pipeline structures, and helps reduce the risk of damage to the pipeline structure and related components during transportation.

[0008] Furthermore, the exhaust pipe assembly includes a first exhaust pipe, a second exhaust pipe, and a third exhaust pipe. One end of the first exhaust pipe is connected to the first compressor, and the other end is connected to the first connection port of the exhaust tee. One end of the second exhaust pipe is connected to the second compressor, and the other end is connected to the second connection port of the exhaust tee. One end of the third exhaust pipe is connected to the third connection port of the exhaust tee, and the other end is connected to the inlet of the oil separator. Thus, with the connection of the exhaust tee and the arrangement of related pipelines, a complete exhaust pipe assembly is formed, realizing functions such as compressor exhaust and refrigerant flow.

[0009] Furthermore, the first exhaust pipe includes a first exhaust U-shaped pipe, a first exhaust straight pipe, and a second exhaust U-shaped pipe connected in sequence. The first exhaust pipe is connected to the first compressor via the first exhaust U-shaped pipe and to an exhaust tee via the second exhaust U-shaped pipe. The second exhaust pipe includes a third exhaust U-shaped pipe, a second exhaust straight pipe, and a fourth exhaust U-shaped pipe connected in sequence. The second exhaust pipe is connected to the second compressor via the third exhaust U-shaped pipe and to an exhaust tee via the fourth exhaust U-shaped pipe. This achieves connectivity of the relevant exhaust pipes and allows for adjustment of the spatial dimensions of the relevant pipes according to actual production design needs by adjusting the extension lengths of the first and second exhaust straight pipes, thus improving the layout of the relevant pipes. Simultaneously, the U-shaped pipes effectively prevent stress concentration in the exhaust pipe assembly, improving the stress distribution of the relevant pipes and ensuring good structural strength, effectively preventing pipe breakage during transportation.

[0010] Furthermore, from a top-down perspective, the angle between the first exhaust U-shaped pipe and the third connecting line is 0°-5°, and the angle between the third exhaust U-shaped pipe and the second connecting line is also 0°-5°. This ensures that the third exhaust U-shaped pipe essentially coincides with the connecting line between the two compressors, and the first exhaust U-shaped pipe essentially coincides with the connecting line between the first compressor and the oil separator. This allows the first and third exhaust U-shaped pipes to occupy as little of the internal space of the isosceles triangle as possible, improving space utilization, ensuring an orderly pipeline layout, and simultaneously increasing the compactness of the exhaust pipe assembly and related components.

[0011] Furthermore, from a top-down perspective, the angle between the first and second exhaust U-tubes is denoted as D, where 50° ≤ D ≤ 70°; the angle between the third and fourth exhaust U-tubes is denoted as E, where 55° ≤ E ≤ 75°. Thus, based on the determined arrangement directions of the first and third exhaust U-tubes, the arrangement of the second and fourth exhaust U-tubes is limited. This allows the second and fourth exhaust U-tubes to be assembled according to the actual arrangement of the exhaust tee, and provides sufficient operating space for welding, facilitating welding operations by assembly personnel in the appropriate welding direction, thereby improving production efficiency.

[0012] Furthermore, the third exhaust pipe includes an exhaust bend, an exhaust transition pipe, and an exhaust connecting pipe connected in sequence. The third exhaust pipe is connected to an exhaust tee via the exhaust bend, and to the oil separator inlet via the exhaust connecting pipe. Thus, by providing the exhaust transition pipe, the third exhaust pipe extends horizontally and vertically, achieving pipeline connection to the oil separator.

[0013] Furthermore, the exhaust transition pipe includes a first pipe section and a second pipe section. The exhaust transition pipe is connected to the exhaust bend through the first pipe section, and to the exhaust connecting pipe through the second pipe section. The first pipe section and the exhaust bend are coplanar, and the second pipe section and the exhaust connecting pipe are coplanar. Thus, the exhaust transition pipe can simultaneously achieve the horizontal and vertical extension transition of the third exhaust pipe through only one bend, simplifying the pipe structure and quantity to the greatest extent. This not only facilitates the assembly and welding of related pipes but also helps ensure the orderly arrangement of the pipes, thereby improving space utilization and the compactness of the pipe layout.

[0014] Furthermore, the exhaust bend includes a vertical pipe section and a horizontal pipe section connected in sequence, with an angle of 90° between the vertical and horizontal pipe sections. In the vertical plane shared by the first pipe section and the exhaust bend, the angle between the first pipe section and the horizontal pipe section of the exhaust bend is denoted as A1, where 90°≤A1≤120°. The exhaust connecting pipe is arranged vertically, and the angle between the second pipe section and the exhaust connecting pipe is denoted as A3, where 120°≤A3≤150°. The angle between the first and second pipe sections is denoted as A2, where 140°≤A2≤160°. By limiting the transition bend angles of the exhaust transition pipe, the pipe extends horizontally and vertically while avoiding excessively small pipe angles, thus reducing the difficulty of pipe assembly and welding. This also effectively prevents excessive stress concentration in the pipe, improving the stress distribution and ensuring good structural strength, effectively preventing pipe breakage during transportation.

[0015] An air conditioner includes a first compressor, a second compressor, an oil separator, and an exhaust pipe assembly for the outdoor unit of the air conditioner. The exhaust pipe assembly is connected to the exhaust port of the first compressor, the exhaust port of the second compressor, and the inlet of the oil separator.

[0016] Compared with the prior art, the exhaust pipe assembly of an air conditioner outdoor unit and the air conditioner described in this invention have the following advantages:

[0017] The present invention discloses an exhaust pipe assembly for an outdoor air conditioning unit and an air conditioner. By arranging the first compressor, the second compressor, and the oil separator in a triangle, a spatial constraint is provided for the orderly arrangement of the exhaust pipe assembly. Simultaneously, this arrangement ensures a compact layout among the first compressor, the second compressor, and the oil separator, preventing a dispersed exhaust pipe assembly layout and improving its compactness. Furthermore, the exhaust tee, as a component connecting the first compressor, the second compressor, and the oil separator, is positioned within the triangle. This facilitates approximately equal lengths of the relevant refrigerant piping, avoiding excessively long refrigerant piping structures and reducing the risk of damage during transportation of the piping structure and related components. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of an air conditioner outdoor unit according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the assembly structure of the exhaust pipe assembly of an air conditioner outdoor unit according to an embodiment of the present invention;

[0021] Figure 3 This is a top view of an exhaust pipe assembly for an outdoor unit of an air conditioner according to an embodiment of the present invention;

[0022] Figure 4 For the embodiments of the present invention in Figure 3 Side view along the Z-axis;

[0023] Figure 5 This is a schematic diagram of the assembly structure of the return pipe assembly of an air conditioner outdoor unit according to an embodiment of the present invention;

[0024] Figure 6 This is a top view of a return air pipe assembly for an outdoor unit of an air conditioner according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the assembly structure of the valve pipe assembly of a four-way valve for an outdoor unit of an air conditioner, as described in an embodiment of the present invention.

[0026] Figure 8 This is a front view of the valve pipe assembly of a four-way valve for an outdoor unit of an air conditioner according to an embodiment of the present invention;

[0027] Figure 9 This is a top view of the valve pipe assembly of a four-way valve for an outdoor unit of an air conditioner, as described in an embodiment of the present invention.

[0028] Figure 10 This is a top view (including the condenser assembly) of an air conditioner outdoor unit according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Chassis; 101. Length centerline; 102. Width centerline; 11. First compressor; 12. First liquid receiver; 13. Second compressor; 14. Second liquid receiver; 15. First gas-liquid separator; 151. First gas outlet; 16. Second gas-liquid separator; 161. Second gas outlet; 17. Oil separator; 18. Shut-off valve; 19. Four-way valve; 191. Centerline; 2. Exhaust pipe assembly; 21. First exhaust pipe; 211. First exhaust U-shaped pipe; 212. First exhaust straight pipe; 213. Second exhaust pipe... 22. Second exhaust pipe; 221. Third exhaust pipe; 222. Second exhaust straight pipe; 223. Fourth exhaust pipe; 23. Exhaust tee; 24. Third exhaust pipe; 241. Exhaust bend; 2411. Vertical pipe section; 2412. Horizontal pipe section; 242. Exhaust transition pipe; 2421. First pipe section; 2422. Second pipe section; 243. Exhaust connecting pipe; 25. First connecting line; 26. Second connecting line; 27. Third connecting line; 3. Return air pipe assembly; 31. First return air pipe; 32. 33. Second return air pipe; 34. First return air tee; 35. Fourth return air pipe; 36. First center line; 37. Second return air tee; 38. Fifth return air pipe; 39. First return air U-shaped pipe; 30. Second return air U-shaped pipe; 31. Third return air U-shaped pipe; 32. Sixth return air pipe; 33. Fourth return air U-shaped pipe; 34. Fifth return air U-shaped pipe; 45. First valve pipe; 46. First straight pipe; 47. First U-shaped pipe; 5. Second valve pipe; 51. Second U-shaped pipe; 52. First tee; 53. First branch pipe; 54. Second branch pipe; 55. Second center line; 6. Third valve pipe; 61. Second straight pipe; 62. First transition pipe; 63. Third straight pipe; 64. Fourth straight pipe; 7. Fourth valve pipe; 71. Third U-shaped pipe; 72. Second transition pipe; 73. Second tee; 74. First connecting pipe; 75. Extension pipe; 76. Second connecting pipe; 81. Sixth connecting line; 82. Seventh connecting line; 83. Eighth connecting line; 91. First condenser; 92. Second condenser. Detailed Implementation

[0031] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. While the descriptions of pipe layouts, including angles and bends, are based on the pipe's own name, they are actually derived from the centerline of the corresponding pipe to avoid excessive detail. Furthermore, the directions used in this application refer to the conventional directions under normal assembly and placement of the air conditioner outdoor unit; please refer to the direction coordinates in the accompanying drawings. The "top view" in this application can also be understood as a vertically downward projection direction. Additionally, the term "opening" in the U-shaped pipe structure refers to the pipe opening of the U-shaped pipe, intended to describe the orientation of the U-shaped pipe.

[0033] In this application, from a top-down view, the "left-right direction" is parallel to the width centerline 102 of the chassis 1, and the "front-back direction" is parallel to the length centerline 101 of the chassis 1. Based on this parallel relationship, all descriptions in this application involving angles, dimensional relationships, and relative positions with respect to the left-right direction can be equated to angles, dimensional relationships, and relative positions with respect to the width centerline 102. For example: Appendix Figure 9 The statement "centerline 191 is parallel to the left and right directions" is equivalent to saying that centerline 191 is parallel to the width centerline 102. The same applies to the front and back directions.

[0034] Furthermore, given that the main bodies of components such as compressors and gas separators are approximately cylindrical, this application uses a top-down view as the basis for describing the center of these components, with the center of the circle in the top view taken as the center of the relevant component. Dimensions, distances, and connections related to the center of these components are also based on this top-down view. Additionally, when describing distances, dimensions, and connections, this application may refer to the specific accompanying drawings, using the perspective shown in the actual drawings as the standard. For example: [Attached Figure 1] Figure 3 Appendix Figure 6 Appendix Figure 9-10 All dimensions and angle markings are based on a top-down view. Virtual lines such as the first line (25), second line (26), and third line (27) are also based on a top-down view. (Appendix) Figure 8 It is based on the formal perspective (i.e., from front to back), and the relevant angle markings, virtual lines, etc. are all based on the formal perspective.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] In existing technologies, for conventional multi-split air conditioner outdoor units, due to the numerous components in their refrigerant systems, the internal refrigerant piping, such as the exhaust pipe assembly, return pipe assembly, and four-way valve assembly, is often not optimized in its layout. This results in a chaotic and disorganized internal piping layout, leading to low space utilization and increased difficulty in assembly and maintenance, hindering the ease of disassembly and repair. Furthermore, in addition to this chaotic refrigerant piping layout, existing multi-split air conditioner outdoor units often have some excessively long refrigerant pipes, increasing the risk of damage to the piping structure and related components during transportation.

[0037] To address the problem of disorganized and disordered refrigerant piping layouts in existing technologies, including exhaust pipe assemblies, return pipe assemblies, and four-way valve assembly, this embodiment proposes an air conditioner outdoor unit, as shown in the attached diagram. Figure 1 As shown, the outdoor unit of the air conditioner includes a chassis 1 and a four-way valve 19. The chassis 1 can be a conventional multi-split air conditioner outdoor unit chassis, which will not be described in detail. The chassis 1 is equipped with a condenser assembly, a compressor assembly, a gas-liquid separator assembly, an oil separator 17, a shut-off valve 18, an exhaust pipe assembly, a return pipe assembly, and a valve pipe assembly. The compressor assembly is connected to the oil separator 17 through the exhaust pipe assembly, and the gas-liquid separator assembly is connected to the compressor assembly through the return pipe assembly. The four-way valve 19 is connected to the oil separator 17, the condenser assembly, the shut-off valve 18, and the gas-liquid separator assembly respectively through the valve pipe assembly. Given that the specific structure and working principle of the condenser, compressor, gas-liquid separator, oil separator, four-way valve, and shut-off valve can all refer to existing technologies, are all conventional components in the air conditioning field, and can all be directly purchased from the market, they will not be described in detail.

[0038] This application focuses on optimizing and improving the layout of the exhaust pipe assembly 2, the return pipe assembly 3, the valve pipe assembly, and related components, especially improving the layout of the related refrigerant pipelines.

[0039] First, this application introduces the layout improvements related to the exhaust pipe assembly 2.

[0040] As attached Figure 2-4As shown, the compressor assembly includes a first compressor 11 and a second compressor 13. The exhaust pipe assembly 2 includes an exhaust tee 23, which is connected to the exhaust port of the first compressor 11, the exhaust port of the second compressor 13, and the inlet of the oil separator 17. From a top-down view, the line connecting the center of the first compressor 11 and the center of the oil separator 17 is designated as the third line 27, the line connecting the center of the first compressor 11 and the center of the second compressor 13 is designated as the second line 26, and the line connecting the center of the second compressor 13 and the center of the oil separator 17 is designated as the first line 25. The length of the first line 25 is greater than or equal to the length of the second line 26, and the length of the third line 27 is greater than or equal to the length of the second line 26. This arrangement of the first compressor, the second compressor, and the oil separator in a triangle provides a spatial constraint for the orderly arrangement of the exhaust pipe assembly. Simultaneously, it makes the layout of the first compressor, the second compressor, and the oil separator as compact as possible, which helps to avoid a scattered layout of the exhaust pipe assembly and improves the compactness of the exhaust pipe assembly layout.

[0041] The first connecting line 25, the second connecting line 26, and the third connecting line 27 form a triangle. The exhaust pipe assembly 2 includes an exhaust tee 23, which is connected to the exhaust port of the first compressor 11, the exhaust port of the second compressor 13, and the inlet of the oil separator 17. From a top view, the exhaust tee 23 is located within the triangle. As a component connecting the first compressor, the second compressor, and the oil separator, placing the exhaust tee within the triangle helps to ensure that the lengths of the relevant refrigerant pipelines are approximately equal, avoiding excessively long refrigerant pipeline structures and reducing the risk of damage to the pipeline structure and related components during transportation.

[0042] Preferably, the third connecting line 27, the second connecting line 26, and the first connecting line 25 form an isosceles triangle. The included angle between the first connecting line 25 and the second connecting line 26 is denoted as C, where C is 50°-70°. The exhaust tee 23 is located within the isosceles triangle and coincides with the axis of symmetry of the isosceles triangle.

[0043] By arranging the first compressor 11, the second compressor 13, and the oil separator 17 in an isosceles triangle, regardless of which line forms the base of the isosceles triangle, most of the pipeline structure of the exhaust pipe assembly will be located within this isosceles triangle, providing a spatial constraint for the orderly arrangement of the exhaust pipe assembly. At the same time, the exhaust tee 23, as a component connecting the first compressor 11, the second compressor 13, and the oil separator 17, is positioned within the isosceles triangle and coincides with the axis of symmetry of the isosceles triangle. This facilitates the approximately equal setting of the length of the relevant refrigerant pipelines, avoiding excessively long refrigerant pipeline structures. In addition, the limitation of angle C also facilitates the smooth routing of the relevant pipelines, avoiding excessively bent pipeline structures and reducing the risk of transportation damage to the pipeline structure and related components.

[0044] Preferably, the exhaust tee 23 coincides with the centroid of the isosceles triangle. The centroid of a triangle is the intersection of its three medians. This further improves the even distribution of refrigerant pipe lengths, preventing excessively long pipes. This facilitates pipe assembly and welding, and reduces the risk of damage to the pipe structure and related components during transportation.

[0045] Preferably, the first compressor 11 and the second compressor 13 are arranged adjacent to each other, the length of the third connecting line 27 is the same as the length of the first connecting line 25, and the angle between the third connecting line 27 and the second connecting line 26 is denoted as B, where B = C.

[0046] More preferably, the third connecting line 27, the second connecting line 26, and the first connecting line 25 form an equilateral triangle, and the exhaust tee 23 coincides with the centroid of the equilateral triangle. At this time, the angle C is 60°, so that the relevant refrigerant pipes in the exhaust pipe assembly can be set up to the greatest extent in terms of spatial length.

[0047] The exhaust pipe assembly 2 further includes a first exhaust pipe 21, a second exhaust pipe 22, and a third exhaust pipe 24. One end of the first exhaust pipe 21 is connected to the first compressor 11, and the other end is connected to the first connection port of the exhaust tee 23. One end of the second exhaust pipe 22 is connected to the second compressor 13, and the other end is connected to the second connection port of the exhaust tee 23. One end of the third exhaust pipe 24 is connected to the third connection port of the exhaust tee 23, and the other end is connected to the inlet of the oil separator 17. Thus, with the connection of the exhaust tee 23 and the arrangement of related pipelines, a complete exhaust pipe assembly 2 is formed, realizing functions such as compressor exhaust and refrigerant flow.

[0048] The first exhaust pipe 21 includes a first exhaust U-shaped pipe 211, a first exhaust straight pipe 212, and a second exhaust U-shaped pipe 213 connected in sequence. The first exhaust pipe 21 is connected to the first compressor 11 through the first exhaust U-shaped pipe 211 and to the exhaust tee 23 through the second exhaust U-shaped pipe 213. The second exhaust pipe 22 includes a third exhaust U-shaped pipe 221, a second exhaust straight pipe 222, and a fourth exhaust U-shaped pipe 223 connected in sequence. The second exhaust pipe 22 is connected to the second compressor 13 through the third exhaust U-shaped pipe 221 and to the exhaust tee 23 through the fourth exhaust U-shaped pipe 223. The tee 23 is used for connection; the openings of the first exhaust U-shaped pipe 211 and the third exhaust U-shaped pipe 221 are both downward-facing, while the openings of the second exhaust U-shaped pipe 213 and the fourth exhaust U-shaped pipe 223 are both upward-facing. These are connected via extensions of the first exhaust straight pipe 212 and the second exhaust straight pipe 222, respectively. Furthermore, the lengths of the extensions of the first exhaust straight pipe 212 and the second exhaust straight pipe 222 can be adjusted according to actual production design needs to modify the spatial dimensions of the relevant pipelines, thus improving the pipeline layout. Simultaneously, the U-shaped pipes effectively prevent stress concentration in the exhaust pipe assembly, improving the stress distribution and ensuring good structural strength, effectively preventing pipeline breakage during transportation.

[0049] Since the compressor's exhaust port is often coaxial with its center, the first exhaust U-shaped pipe 211 is connected to the exhaust port of the first compressor 11, and the third exhaust U-shaped pipe 221 is connected to the exhaust port of the second compressor 13. From a top-down view, the angle between the first exhaust U-shaped pipe 211 and the third connecting line 27 is 0°-5°, and the angle between the third exhaust U-shaped pipe 221 and the second connecting line 26 is 0°-5°. Preferably, the angle between the first exhaust U-shaped pipe 211 and the third connecting line 27 is 0°, and the angle between the third exhaust U-shaped pipe 221 and the second connecting line 26 is 0°-5°. The angle between the second connecting line 26 and the third exhaust U-shaped pipe 221 is 0°, so that the third exhaust U-shaped pipe 221 basically coincides with the connecting line between the two compressors, and the first exhaust U-shaped pipe 211 basically coincides with the connecting line between the first compressor 11 and the oil separator 17. This allows the first exhaust U-shaped pipe 211 and the third exhaust U-shaped pipe 221 to occupy the internal space of the isosceles triangle to the greatest extent, improving the space utilization rate, which is conducive to ensuring the orderly layout of the pipeline, and at the same time improving the compactness of the layout of the exhaust pipe assembly and related components.

[0050] From a top-down perspective, the included angle between the first exhaust U-tube 211 and the second exhaust U-tube 213 is denoted as D, where 50°≤D≤70°; the included angle between the third exhaust U-tube 221 and the fourth exhaust U-tube 223 is denoted as E, where 55°≤E≤75°. Based on the determined arrangement directions of the first and third exhaust U-tubes 211 and 221, the arrangement of the second and fourth exhaust U-tubes 213 is limited. This allows the second and fourth exhaust U-tubes 213 to be assembled according to the actual arrangement of the exhaust tee 23, and provides sufficient operating space for welding, facilitating welding operations by assembly personnel in a suitable welding direction and improving production efficiency.

[0051] As attached Figure 4 As shown, the third exhaust pipe 24, constrained by the inlet height of the oil separator 17, must extend not only horizontally but also vertically to achieve pipeline connectivity. The third exhaust pipe 24 includes an exhaust bend 241, an exhaust transition pipe 242, and an exhaust connecting pipe 243 connected in sequence. The third exhaust pipe 24 is connected to the exhaust tee 23 via the exhaust bend 241 and to the inlet of the oil separator 17 via the exhaust connecting pipe 243. Thus, by providing the exhaust transition pipe 242, the third exhaust pipe 24 extends both horizontally and vertically, achieving pipeline connectivity with the oil separator 17.

[0052] The exhaust transition pipe 242 includes a first pipe section 2421 and a second pipe section 2422. The exhaust transition pipe 242 is connected to the exhaust bend 241 through the first pipe section 2421 and to the exhaust connecting pipe 243 through the second pipe section 2422. The first pipe section 2421 and the exhaust bend 241 are coplanar, and the second pipe section 2422 and the exhaust connecting pipe 243 are coplanar. Thus, the exhaust transition pipe 242 can simultaneously achieve the extension and transition of the third exhaust pipe 24 in both the horizontal and vertical directions by only one bend. This simplifies the pipe structure and quantity to the greatest extent, which not only facilitates the assembly and welding of related pipes, but also helps to ensure the orderly arrangement of pipes, thereby improving space utilization and the compactness of the pipe layout.

[0053] The exhaust bend 241 has a semi-U-shaped structure, comprising a vertical pipe section 2411 and a horizontal pipe section 2412 connected in sequence. Alternatively, the exhaust bend 241 and the first pipe section 2421 can form an approximate U-shaped pipe structure. The included angle between the vertical pipe section 2411 and the horizontal pipe section 2412 is preferably 90°. In the vertical plane shared by the first pipe section 2421 and the exhaust bend 241, the included angle between the first pipe section 2421 and the horizontal pipe section 2412 of the exhaust bend 241 is denoted as A1, where 90°≤A1≤120°. The exhaust connecting pipe 243 is preferably arranged vertically, and the included angle between the second pipe section 2422 and the exhaust connecting pipe 243 is denoted as A3, where 120°≤A3≤150°. The included angle between the first pipe section 2421 and the second pipe section 2422 is denoted as A2, where 140°≤A2≤160°. By limiting the transition bending angle of the exhaust transition pipe 242, the exhaust transition pipe 242 can extend and transition in the horizontal and vertical directions while avoiding excessively small pipe angles. This reduces the difficulty of pipe assembly and welding, effectively avoids excessive stress concentration in the pipe, and helps improve the stress distribution of the relevant pipes, ensuring that the pipes have good structural strength and effectively preventing pipe breakage during transportation.

[0054] Based on the applicant's actual production situation and the size of related components, the layout of the exhaust pipe assembly has been improved, increasing the compactness of the exhaust pipe assembly layout. This allows the overall layout of the exhaust pipe assembly 2 in this application to be implemented in a space with a length of approximately 700mm-800mm and a width of approximately 450mm-550mm (from a top view).

[0055] Then, as attached Figure 5-6 As shown, this application continues to describe the layout improvements related to the return air pipe assembly 3.

[0056] Both the first compressor 11 and the second compressor 13 are conventional air conditioning compressors with a liquid receiver structure. In this application, the compressor assembly and the gas-liquid separator assembly are arranged adjacent to each other. The first compressor 11 has a first liquid receiver 12, and the second compressor 13 has a second liquid receiver 14. The gas-liquid separator assembly includes a first gas-liquid separator 15 and a second gas-liquid separator 16. One end of the return pipe assembly 3 is connected to the first gas-liquid separator 15 and the second gas-liquid separator 16, respectively, and the other end is connected to the first liquid receiver 12 and the second liquid receiver 14, respectively. From a top view, the extended line connecting the center of the first compressor 11 and the center of the second compressor 13 is designated as the fifth line 39, and the extended line connecting the center of the first gas-liquid separator 15 and the center of the second gas-liquid separator 16 is designated as the fourth line 38. The fourth line 38 and the fifth line 39 form an angle F, where 70°≤F≤90°. The return pipe assembly 3 is disposed in the space formed by the angle F. Therefore, by setting the compressor assembly and gas-liquid separator assembly adjacent to each other, the included angle F allows for a compact layout between the two compressors and the two gas-liquid separators, which helps to avoid a scattered layout of the return gas pipe assembly 3 and improves the compactness of the return gas pipe assembly layout. At the same time, the entire return gas pipe assembly can be set within the space within the included angle F (from a top-down view), providing space for the orderly piping of the return gas pipe assembly, and also making the distance between the return gas pipe assembly 3 and the compressor and gas-liquid separator approximately the same, and the related connecting pipes approximately equal in length in space, which can effectively avoid excessively long refrigerant piping structures and reduce the risk of transportation damage to the piping structure and related components.

[0057] Preferably, the return gas pipe assembly 3 includes a fourth return gas pipe 34. One end of the fourth return gas pipe 34 is connected to the first gas-liquid separator 15 and the second gas-liquid separator 16, respectively, and the other end is connected to the first liquid receiver 12 and the second liquid receiver 14, respectively. From a top-view perspective, the fourth return gas pipe 34 intersects the angle bisector of the included angle F. Thus, the fourth return gas pipe 34, as the central pipe of the return gas pipe assembly, is located in the included angle space of F and intersects the angle bisector of F. This makes the distance of the fourth return gas pipe 34 from the compressor and the gas-liquid separator approximately equal, and the related connecting pipes approximately equal in length in space. This effectively avoids excessively long refrigerant piping structures and reduces the risk of damage to the piping structure and related components during transportation.

[0058] The return air pipe assembly 3 includes a first return air pipe 31, a second return air pipe 32, a first return air tee 33, a fourth return air pipe 34, a second return air tee 35, a fifth return air pipe 36, and a sixth return air pipe 37. One end of the first return air pipe 31 is connected to the first gas outlet 151 of the first gas-liquid separator 15, and the other end is connected to the first connection port of the first return air tee 33. One end of the second return air pipe 32 is connected to the second gas outlet 161 of the second gas-liquid separator 16, and the other end is connected to the first return air tee 37. The second connection port of the tee 33 is connected; one end of the fifth return gas pipe 36 is connected to the first liquid receiver 12, and the other end is connected to the first connection port of the second return gas tee 35; one end of the sixth return gas pipe 37 is connected to the second liquid receiver 14, and the other end is connected to the second connection port of the second return gas tee 35; the fourth return gas pipe 34 serves as the core manifold, with one end connected to the third connection port of the first return gas tee 33 and the other end connected to the third connection port of the second return gas tee 35. Thus, with the combination of the fourth return gas pipe 34 and the two tees, and through the arrangement of related connecting pipes, a complete return gas pipe assembly 3 is formed, realizing functions such as compressor return gas and refrigerant flow.

[0059] Since the fourth return pipe 34 is a manifold, in order to ensure that the cold medium flows smoothly through the fourth return pipe 34, the fourth return pipe 34 is preferably a horizontally arranged straight pipe structure, so that the cold medium can flow in the horizontal direction without any tortuous or meandering flow direction, which is conducive to ensuring the smooth flow state of the cold medium after the manifold.

[0060] Considering the potential height difference between the gas separator outlet and the liquid receiver, the first return gas tee 33 and the second return gas tee 35 are both set vertically, while the fourth return gas pipe 34 is set horizontally. The first return gas pipe 31, the second return gas pipe 32, the fifth return gas pipe 36, and the sixth return gas pipe 37 all have U-shaped pipe structures. This allows for adjustment of the height difference according to the actual assembly situation and effectively avoids excessive stress concentration in the pipelines, thus improving the stress distribution of the relevant pipelines and ensuring good structural strength. This effectively prevents pipeline breakage during transportation and also facilitates the assembly and welding of the relevant pipelines, thereby improving production efficiency.

[0061] Preferably, the fourth return air pipe 34 is horizontally arranged, and the extension direction of the fourth return air pipe 34 is parallel to the left and right direction. The central axis of the fourth return air pipe 34 is designated as the first centerline 341. From a top view, the center of the first gas-liquid separator 15 and the center of the second gas-liquid separator 16 are located on both sides of the first centerline 341, that is, the first gas-liquid separator 15 and the second gas-liquid separator 16 are arranged one behind the other.

[0062] The configuration of the first gas-liquid separator 15 and the second gas-liquid separator 16 is as shown in the attached figure. Figure 6 As shown, taking the side closest to the first return air tee 33 as the center, and referring to the virtual circular lines that the first return air pipe 31 and the second return air pipe 32 can rotate out, the positions of the first gas separation outlet 151 and the second gas separation outlet 161 on the virtual circular lines can be adjusted according to the actual space design requirements. Correspondingly, the actual orientation of the first return air pipe 31 and the second return air pipe 32 can be adjusted. Therefore, after determining the positions of the first gas separation outlet 151 and the second gas separation outlet 161, the arrangement between the first gas-liquid separator 15 and the second gas-liquid separator 16 can be further adjusted. This application does not impose excessive restrictions on the layout between the two gas-liquid separators. Preferably, the line connecting the first gas separation outlet 151 and the second gas separation outlet 161 is parallel to the front-back direction, which helps ensure a neat and orderly routing of the return air pipeline structure. This not only facilitates pipeline assembly, positioning, and welding but also improves space utilization.

[0063] Both the first return air pipe 31 and the second return air pipe 32 are conventional U-shaped pipes. The vertical plane where the first return air tee 33 is located is perpendicular to the first centerline 341. At the same time, with the first centerline 341 as the axis of symmetry, the first return air pipe 31 and the second return air pipe 32 are symmetrically arranged. The angle between the plane where the first return air pipe 31 is located and the first centerline 341 is denoted as G1, and the angle between the plane where the second return air pipe 32 is located and the first centerline 341 is denoted as G2, where G1 = G2. This allows the first return air pipe 31 and the second return air pipe 32 to use U-shaped pipes of the same size and specification, reducing the number of related piping types and improving the compatibility of related pipelines.

[0064] Regarding the layout of the fifth return gas pipe 36, the sixth return gas pipe 37, and the compressor assembly, this application arranges the first compressor 11 and the second compressor 13 in an outward "V" shape. Specifically, from a top-down view, the line connecting the center of the first liquid reservoir 12 and the center of the first compressor 11 is designated as line number one, and the line connecting the center of the second liquid reservoir 14 and the center of the second compressor 13 is designated as line number two. The forward extensions of line number one and line number two intersect. Simultaneously, the minimum angle between line number one and the left / right direction is 40°-80°, and line number two... The minimum angle between the connecting line and the left and right directions is 40°-80°; thus, the first compressor 11 and the second compressor 13 are arranged in an outward "V" shape under specific directions and angles, which allows for a large assembly space between the first and second connecting lines, providing space leeway for the arrangement of return gas pipes, especially for the fifth return gas pipe 36, the sixth return gas pipe 37, and even the fourth return gas pipe 34; at the same time, it is also beneficial to concentrate most of the return gas pipes in this assembly space, which is conducive to further improving the compactness of the internal layout of the multi-split air conditioner outdoor unit.

[0065] The fifth return gas pipe 36 includes a first return gas U-shaped pipe 361, a second return gas U-shaped pipe 362, and a third return gas U-shaped pipe 363 connected in sequence. The sixth return gas pipe 37 includes a fourth return gas U-shaped pipe 371, a fifth return gas U-shaped pipe 372, and a sixth return gas U-shaped pipe 373 connected in sequence. The first, third, fourth, and sixth return gas U-shaped pipes 361, 363, 371, and 373 all open downwards, while the second, fifth, and sixth return gas U-shaped pipes 362 and 372 all open upwards. By setting multiple U-shaped pipe structures to form the fifth return gas pipe 36 and the sixth return gas pipe 37, a continuous U-shaped pipeline structure is formed, which can adjust the height difference of the liquid reservoir. On the other hand, it can effectively avoid excessive stress concentration in the pipeline, which is conducive to improving the stress distribution of the relevant pipelines, so as to ensure that the pipeline has good structural strength and can effectively prevent pipeline breakage during transportation.

[0066] From a top-down perspective, the first return air U-shaped pipe 361 and the third return air U-shaped pipe 363 are arranged in parallel, as are the fourth return air U-shaped pipe 371 and the sixth return air U-shaped pipe 373. The angle between the first return air U-shaped pipe 361 and the second return air U-shaped pipe 362 is 60°-80°, and the angle between the fourth return air U-shaped pipe 371 and the fifth return air U-shaped pipe 372 is 60°-80°. This effectively improves the orderliness and compactness of the return air pipeline structure layout, and also helps to improve space utilization.

[0067] Preferably, the vertical plane of the second return air tee 35 is perpendicular to the first center line 341; the first return air U-tube 361, the third return air U-tube 363, the fourth return air U-tube 371, and the sixth return air U-tube 373 are all parallel to the first center line 341, thereby further improving the orderliness and compactness of the return air pipeline structure layout, avoiding possible spatial interference between the pipelines, and facilitating the assembly and welding of the relevant pipelines.

[0068] Based on the applicant's actual production situation and the size of related components, the layout of the return air pipe assembly was improved, increasing the compactness of the return air pipe assembly layout. This allows the overall layout of the return air pipe assembly 3 in this application to be implemented in a space with a length of approximately 450mm-550mm and a width of approximately 200mm-260mm (from a top view).

[0069] Finally, as attached Figure 7-9As shown, this application continues to describe the layout improvements related to the valve pipe assembly. The valve pipe assembly layout in this application is mainly based on the related pipes and components connected to the four-way valve 19. Correspondingly, the valve pipe assembly also includes four pipe structures, namely the first valve pipe 4, the second valve pipe 5, the third valve pipe 6, and the fourth valve pipe 7, corresponding to the four valve ports of the four-way valve 19. Since the space between the compressor assembly, the oil separator 17, and the gas-liquid separator assembly is mainly used to arrange the exhaust pipe assembly and the return gas pipe assembly, the valve pipe assembly is mainly arranged in the outer space of the exhaust pipe assembly and the return gas pipe assembly (from a top view). Specifically, the valve pipe assembly is mainly arranged in the rear space and the left and right sides of the exhaust pipe assembly and the return gas pipe assembly.

[0070] The four-way valve 19 is connected to the outlet of the oil separator 17 through the first valve pipe 4, the four-way valve 19 is connected to the condenser assembly through the second valve pipe 5, the four-way valve 19 is connected to the shut-off valve 18 through the third valve pipe 6, and is connected to the indoor unit through the shut-off valve 18, and the four-way valve 19 is connected to the gas-liquid separator assembly through the fourth valve pipe 7.

[0071] In the left-right direction, an oil separator 17 and a gas-liquid separator assembly are installed in the space on one side of the four-way valve 19, and a shut-off valve 18 is installed in the space on the other side, so that the relevant valve pipes can be arranged in different left and right directions, avoiding the valve pipes from being too crowded, and also avoiding the occurrence of spatial interference, interference fit, temperature difference heat transfer interference and other situations that may exist between different pipelines.

[0072] From a top-down perspective, let X be the minimum distance from the center of the four-way valve 19 to the leftmost side of the third valve pipe 6, and let Y be the minimum distance from the leftmost side of the third valve pipe 6 to the rightmost side of the fourth valve pipe 7. The ratio of X to Y is 0.25-0.35. By limiting this ratio of X / Y, on the one hand, the oil separator and gas-liquid separator components on the same side have sufficient layout space and piping space; on the other hand, it avoids excessive extension of related valve pipes, and to a certain extent, limits the length of individual pipelines, preventing the occurrence of excessively long individual pipelines, and effectively reducing the risk of transportation damage to related pipelines and components.

[0073] Preferably, the four-way valve 19 is arranged horizontally, meaning its length is parallel to the horizontal plane. This horizontal plane can be any height; it can be considered as the four-way valve 19 being positioned at a certain height. From a top-down perspective, without specific limitations, the length of the four-way valve 19 can be parallel to the front-back direction, the left-right direction, or other directions within the horizontal plane. The four-way valve 19 is positioned behind the compressor unit. The ratio of the minimum distance between the four-way valve 19 and the rear side of the outdoor unit to the width of the chassis 1 is 0.2-0.5. This positions the four-way valve 19 between the compressor unit and the condenser assembly at the rear side of the outdoor unit. This avoids the four-way valve 19 and individual valve pipes being too close to the condenser assembly, preventing interference from temperature difference heat transfer. Furthermore, it allows the valve pipe assembly connected to the four-way valve 19 to be directly positioned in the rear space of the exhaust pipe assembly and the return pipe assembly, and allows for pipe extension to the left and right sides. The four-way valve 19 adopts a conventional four-way valve structure, which typically has four valve ports. Based on the horizontal setting of the four-way valve 19, one valve port is located on the upper side of the four-way valve 19 and is referred to as the first valve port. The other three are located on the lower side of the four-way valve 19 and are referred to as the second valve port, the third valve port, and the fourth valve port, respectively, for the purpose of introducing the subsequent technical content.

[0074] In this application, the central axis of the four-way valve 19 in the length direction is referred to as the center line 191. The center line 191 is parallel to the left and right direction, so that the four-way valve 19 occupies as little space as possible in the front and back direction, so as to avoid interfering with the layout of the exhaust pipe assembly 2 and the return pipe assembly 3 in front of it, and also to avoid being too close to the condenser assembly behind it. In the relatively narrow space between the layout space of the exhaust pipe assembly 2 and the return pipe assembly 3 and the condenser assembly, the four-way valve 19 and related valve pipes can be mainly extended in the left and right direction.

[0075] When introducing the second valve tube 5, the condenser assembly will be introduced first, as shown in the attached document. Figure 10 The multi-split air conditioner outdoor unit in this application is equipped with two compressors, two gas-liquid separators, and two condensers. The condenser assembly includes a first condenser 91 and a second condenser 92. The center line of the chassis 1 along its length is designated as the length center line 101. With the length center line 101 as the axis of symmetry, the first condenser 91 and the second condenser 92 are symmetrically arranged so that the overall center of gravity of the outdoor unit is near its central region.

[0076] One end of the second valve pipe 5 is connected to the second valve port of the four-way valve 19, and the other end is connected to the first condenser 91 and the second condenser 92 respectively. In a top view, the center symmetry line of the second valve pipe 5 is collinear with the length centerline 101, so that the space between the second valve pipe 5 and the first condenser 91 and the second condenser 92 is the same, which is beneficial to the layout of related branch pipes. Related branch pipes can use pipelines of the same size and specification, reducing the number of related piping types and improving the compatibility of related pipelines.

[0077] Preferably, from a top-down view, one end of the second valve pipe 5 is connected to the four-way valve 19, and the other end extends rearward to connect to the first condenser 91 and the second condenser 92. Specifically, the rearward extension direction of the second valve pipe 5 is perpendicular to the vertical plane where the center line 191 is located, thereby minimizing the spatial length of the piping between the four-way valve 19 and the condenser assembly, which helps to reduce the risk of damage to related pipelines and components during transportation.

[0078] The second valve pipe 5 includes a second U-shaped pipe 51, a first tee 52, a first branch pipe 53, and a second branch pipe 54. One end of the second U-shaped pipe 51 is connected to the second valve port of the four-way valve 19, and the other end is connected to the first port of the first tee 52. One end of the first branch pipe 53 is connected to the second port of the first tee 52, and the other end is connected to the second condenser 92. One end of the second branch pipe 54 is connected to the third port of the first tee 52, and the other end is connected to the first condenser 91. The second port of the first tee 52 is closer to the second condenser 92, and the third port of the first tee 52 is closer to the first condenser 91. Preferably, in a top-view perspective, the second U-shaped pipe 51 and the first tee 52 coincide with the length centerline 101, and the rearward extension direction of the second U-shaped pipe 51 is perpendicular to the vertical plane containing the centerline 191. The structure of the second valve pipe 5 serves two purposes: firstly, it allows for the extension of the pipeline in both the vertical and longitudinal directions, ensuring the connection between the four-way valve 19 and the condenser assembly; secondly, it effectively prevents excessive stress concentration in the pipeline, improves the stress distribution of the relevant pipelines, ensures good structural strength of the pipeline, and effectively prevents pipeline breakage during transportation.

[0079] As attached Figure 8As shown, in a frontal view (projection from front to back), the second valve pipe 5 is configured as a symmetrical structure, and its axis of symmetry is denoted as the second centerline 55. The vertical plane containing the second centerline 55 coincides with the vertical plane containing the length centerline 101. Alternatively, in a top-down view, the length centerline 101 coincides with the axis of symmetry of the second valve pipe 5. For each pipe assembly of the second valve pipe 5, the plane containing the second U-shaped pipe 51 coincides with the second centerline 55, and the first tee 52 itself has the second centerline 55 as its axis of symmetry. Similarly, with the second centerline 55 as its axis of symmetry, the first branch pipe 53 and the second branch pipe 54 are symmetrically arranged. Accordingly, the first branch pipe 53 and the second branch pipe 54 can be straight pipe structures, or as shown in the attached diagram. Figure 8 As shown, a bent pipe structure is designed according to the actual space extension requirements. The bending angle of the first branch pipe 53 is denoted as J1, and the bending angle of the second branch pipe 54 is denoted as J2, where J1 = J2. This ensures that the spatial dimensions of the second valve pipe 5 from the first condenser 91 and the second condenser 92 are exactly the same. The first branch pipe 53 and the second branch pipe 54 can use pipes of the same size and specification, reducing the number of related piping types and improving the compatibility of related pipes.

[0080] The first valve pipe 4 includes a first straight pipe 41 and a first U-shaped pipe 42 connected in sequence, with the opening of the first U-shaped pipe 42 facing downwards. Preferably, one end of the first U-shaped pipe 42 is connected to the first valve port of the four-way valve 19, and the other end is collinear with the outlet of the oil separator 17 in the vertical direction. The first straight pipe 41 is connected to both the first U-shaped pipe 42 and the outlet of the oil separator 17, so that one opening of the first U-shaped pipe 42 is located directly above the outlet of the oil separator 17, facilitating the assembly and welding of the first straight pipe 41. In this case, the first straight pipe 41 and the first U-shaped pipe 42 can also be considered as a complete U-shaped pipe.

[0081] Of course, as attached Figure 9 As shown, if the oil separator 17 is limited by the layout space, the angle between the plane where the first U-shaped tube 42 is located and the left and right directions can be adjusted, or a transition extension pipeline can be set, or the first straight tube 41 can be designed as a connecting pipeline with a certain bend transition.

[0082] Preferably, the oil separator 17 is located on the right side of the four-way valve 19, and the first U-shaped pipe 42 is parallel to the center line 191, that is, the two are coplanar in the vertical direction. If the oil separator 17 has an appropriate space adjustment margin, the outlet position of the oil separator 17 can be further adjusted to ensure that the first straight pipe 41 is a vertically downward extension pipe, which helps to simplify the structure of the first valve pipe 4 itself, and at the same time facilitates the assembly and welding of related pipes to improve production efficiency.

[0083] For the fourth valve pipe 7, considering that it needs to be connected to two gas-liquid separators, the extension in terms of height and length must be taken into account. The fourth valve pipe 7 includes a third U-shaped pipe 71, a second transition pipe 72, a second tee 73, a first connecting pipe 74, and a second connecting pipe 76. One end of the third U-shaped pipe 71 is connected to the fourth valve port of the four-way valve 19, and the other end is connected to the first port of the second tee 73 through the second transition pipe 72. One end of the first connecting pipe 74 is connected to the second port of the second tee 73, and the other end is connected to the first gas-liquid separator 15. One end of the second connecting pipe 76 is connected to the third port of the second tee 73, and the other end is connected to the second gas-liquid separator 16. Thus, on the one hand, the four-way valve 19 is connected to the first gas-liquid separator 15 and the second gas-liquid separator 16 respectively, and on the other hand, it can effectively avoid excessive stress concentration in the pipeline, which is conducive to improving the stress distribution of the relevant pipelines, so as to ensure that the pipeline has good structural strength and can effectively prevent pipeline breakage during transportation.

[0084] The opening of the third U-shaped pipe 71 faces upward. In this application, since the gas-liquid separator assembly is also located on the right side of the four-way valve 19, the upward direction of the pipeline is transitioned to the right-side direction by setting the second transition pipe 72, and at the same time, the third U-shaped pipe 71 can be connected to the second three-way valve 73.

[0085] Since both the oil separator 17 and the gas-liquid separator assembly are located to the right of the four-way valve 19, the layout between the oil separator 17 and the gas-liquid separator assembly must be carefully considered when laying out the fourth valve pipe 7. In this application, taking into account the overall layout of the exhaust pipe assembly 2, the return gas pipe assembly 3, and related components, the oil separator 17 is positioned between the four-way valve 19 and the gas-liquid separator assembly. From a top-down perspective, the line connecting the center of the oil separator 17 and the center of the first gas-liquid separator 15 is designated as the sixth line 81, and the line connecting the center of the first gas-liquid separator 15 and the center of the second gas-liquid separator 16 is designated as the seventh line 82. The line connecting the center of the second gas-liquid separator 16 and the center of the oil separator 17 is designated as the eighth line 83. The included angle V between the sixth line 81 and the seventh line 82 is 75°-120°. This avoids the oil separator 17 and the gas-liquid separator assembly from being too concentrated, thus preventing spatial interference between related valves and pipes. On the other hand, it provides sufficient space for the exhaust pipe assembly 2 and the return pipe assembly 3 between the compressor assembly, the oil separator 17, and the gas-liquid separator assembly, thus preventing spatial interference, interference fit, and thermal interference between related valves and the exhaust pipe assembly 2 or the return pipe assembly 3.

[0086] To ensure a compact layout of components and minimize pipeline extension length, the triangle formed by the sixth line 81, the seventh line 82, and the eighth line 83 is an isosceles triangle. Alternatively, without considering the included angle V, the triangle can be set as an equilateral triangle. Of course, if spatial interference exists in the layout of components and pipelines, it can be addressed as shown in the attached figure. Figure 9 As shown, the triangle is adjusted to approximately an isosceles right triangle. Preferably, the sixth connecting line 81 is perpendicular to the seventh connecting line 82, and the lengths of the sixth connecting line 81 and the seventh connecting line 82 are equal. This limits the layout between the oil separator and the gas-liquid separator components, making the layout more compact, which helps to shorten the extension length of the relevant valve pipes and effectively reduces the risk of damage to the relevant pipelines and components during transportation.

[0087] In the relative arrangement of the oil separator 17 and the gas-liquid separator assembly, the fourth valve pipe 7 preferably extends to the space behind the oil separator 17, and then connects to the two gas-liquid separators respectively, so as to bypass the oil separator 17 located in the middle and related pipelines and avoid spatial interference. Specifically, in a top view, the third U-shaped pipe 71 extends towards the right rear of the four-way valve 19. Let the angle between the center line 191 and the vertical plane where the third U-shaped pipe 71 is located be L, 35°≤L≤45°, so that the fourth valve pipe 7 extends at an angle L immediately after extending from the four-way valve 19, so as to bypass the oil separator 17 and related pipelines and avoid spatial interference.

[0088] From a top-down perspective, to avoid excessive detour length of the fourth valve pipe 7, the extension length of the third U-shaped pipe 71 is determined according to actual needs without causing spatial interference. Subsequently, the axis of symmetry of the second tee 73 is parallel to the center line 191, that is, the second tee 73 is also horizontally set and extends in the left and right directions, so that the fourth valve pipe 7 can be laid with the shortest possible pipe length in the left and right directions.

[0089] Considering the overall layout of the exhaust pipe assembly 2, the return pipe assembly 3, and related components in this application, the first gas-liquid separator 15 and the second gas-liquid separator 16 are positioned one in front of the other in the front-rear direction. This results in different lengths of the second tee 73 from the first gas-liquid separator 15 and the second gas-liquid separator 16. Relatively speaking, the second tee 73 is closer to the first gas-liquid separator 15, and only the first connecting pipe 74 needs to be appropriately extended in the horizontal and vertical directions to connect the fourth valve pipe 7 to the first gas-liquid separator 15. For the pipeline structure between the second tee 73 and the second gas-liquid separator 16, it is necessary not only to extend in the left-right and up-down directions, but also to extend forward. The extension is appropriately adjusted to accommodate the front and rear positions of the first gas-liquid separator 15 and the second gas-liquid separator 16. The second connecting pipe 76 includes an extension pipe 75, which is connected to the second tee 73. The extension pipe 75 is horizontally positioned and bends forward for transition. The bending angle of the extension pipe 75 is denoted as K, which is 95°-110°. This ensures that the extension pipe 75 does not bend excessively when extending towards the second gas-liquid separator 16, thus avoiding stress concentration in the pipeline. Furthermore, once the extension pipe 75 extends above the connection port of the second gas-liquid separator 16, it can be directly connected to the second gas-liquid separator 16 via the second connecting pipe 76.

[0090] For the third valve pipe 6, the four-way valve 19 is laid on the side away from the oil separator 17 and the gas-liquid separator assembly. The space for laying the pipe is relatively abundant, but it is still necessary to avoid the third valve pipe 6 being too close to the exhaust pipe assembly 2 and the return gas pipe assembly 3 and to avoid spatial interference. At the same time, it is necessary to meet the appropriate extension of the pipeline in terms of height and horizontal length so as to allow the four-way valve 19 to connect with the shut-off valve 18.

[0091] One end of the third valve pipe 6 is connected to the third valve port of the four-way valve 19, and the other end is connected to the shut-off valve 18. The third valve port is the valve port of the four-way valve 19 closest to the shut-off valve 18. Taking the oil separator 17 and the gas-liquid separator assembly as being located on the right side of the four-way valve 19 as an example, the third valve port is the leftmost valve port of the four-way valve 19. This makes the distance between the third valve port and the shut-off valve 18 as short as possible, which is beneficial to reducing the pipeline length. On the other hand, it allows the third valve pipe 6 to extend directly toward the shut-off valve 18 without spatial interference with other valve pipes.

[0092] The third valve pipe 6 includes a second straight pipe 61, a first transition pipe 62, a third straight pipe 63, and a fourth straight pipe 64 connected in sequence. At both ends of the third valve pipe 6, the second straight pipe 61 is connected to the third valve port of the four-way valve 19, and the fourth straight pipe 64 is connected to the shut-off valve 18. The second straight pipe 61, the first transition pipe 62, and the third straight pipe 63 are coplanar, primarily allowing the third valve pipe 6 to extend in the height and left-right directions. It can also extend appropriately in the front-back direction until it reaches the same horizontal plane as the shut-off valve 18. The fourth straight pipe 64 is horizontally positioned and connected to the shut-off valve 18, thus easily enabling communication between the four-way valve 19 and the shut-off valve 18.

[0093] Regarding the arrangement of the second straight pipe 61, the first transition pipe 62, and the third straight pipe 63, the second straight pipe 61 and the third straight pipe 63 are parallel and both extend vertically downwards. The included angle between the second straight pipe 61 and the first transition pipe 62 is denoted as H1, and the included angle between the first transition pipe 62 and the third straight pipe 63 is denoted as H2, where H1 = H2. Preferably, H1 is between 105° and 120°, and H2 is also 105°. This avoids excessively small bending angles in the pipes during the extension of the third valve pipe 6, preventing stress concentration and ensuring the mechanical strength of the pipes.

[0094] Preferably, the plane containing the second straight pipe 61, the first transition pipe 62, and the third straight pipe 63 is designated as the first plane, which coincides with the center line 191 of the four-way valve 19. This allows the pipeline composed of the second straight pipe 61, the first transition pipe 62, and the third straight pipe 63 to extend only in the vertical plane in the left and right directions, and only in the height and left and right directions. It does not extend towards the space in front of the four-way valve 19, thereby effectively bypassing the exhaust pipe assembly 2 and the return pipe assembly 3 on the front side and avoiding unnecessary pipeline interference.

[0095] The fourth straight pipe 64 is perpendicular to the first plane. That is, the second straight pipe 61, the first transition pipe 62, and the third straight pipe 63 work together to extend the pipeline to the rear of the shut-off valve 18. At this time, the fourth straight pipe 64 only needs to extend horizontally forward to enable the third valve pipe 6 to extend simultaneously in height and horizontal length, and to satisfy the connection between the four-way valve 19 and the shut-off valve 18.

[0096] This application is attached Figure 8-9 For example, the shut-off valve 18 is located in the space to the left of the four-way valve 19. The second straight pipe 61 extends vertically downwards, the first transition pipe 62 extends to the lower left, and the third straight pipe 63 extends vertically downwards (see attached diagram). Figure 8 (view from which); then the fourth straight tube 64 extends horizontally forward (see attached). Figure 9 (From the perspective of)

[0097] Based on the applicant's actual production situation and the size of related components, the layout of the valve tube assembly has been improved, increasing its compactness. This allows the overall layout of the valve tube assembly in this application to be implemented in a space with a length of approximately 650mm-750mm and a width of approximately 245mm-285mm (from a top view).

[0098] In this invention, any air conditioner may include at least one of the pipe structures and their layouts described in this embodiment, such as the exhaust pipe assembly, return pipe assembly, and valve pipe assembly. In addition to the relevant structures, assembly relationships, and layouts of the outdoor unit provided in this embodiment, the air conditioner also includes conventional outdoor unit components such as electrical controls, fans, and housings. Similarly, the air conditioner also includes an indoor unit and related components. Since these are all prior art, they will not be described in detail here.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An exhaust pipe assembly of an outdoor unit of an air conditioner, characterized by comprising: The outdoor unit of the air conditioner includes a compressor assembly and an oil separator (17). The compressor assembly includes a first compressor (11) and a second compressor (13). The exhaust pipe assembly (2) is connected to the exhaust port of the first compressor (11), the exhaust port of the second compressor (13), and the inlet of the oil separator (17). In a top view, the line connecting the center of the first compressor (11) and the center of the oil separator (17) is called the third line (27), the line connecting the center of the first compressor (11) and the center of the second compressor (13) is called the second line (26), and the line connecting the center of the second compressor (13) and the center of the oil separator (17) is called the first line (25). The length of the first line (25) is ≥ the length of the second line (26), and the length of the third line (27) is ≥ the length of the second line (26). The exhaust pipe assembly (2) includes a first exhaust pipe (21), a second exhaust pipe (22), and a third exhaust pipe (24). One end of the first exhaust pipe (21) is connected to the first compressor (11), and the other end is connected to the first connection port of the exhaust tee (23). One end of the second exhaust pipe (22) is connected to the second compressor (13), and the other end is connected to the second connection port of the exhaust tee (23). One end of the third exhaust pipe (24) is connected to the third connection port of the exhaust tee (23), and the other end is connected to the inlet of the oil separator (17). The first exhaust pipe (21) includes a first exhaust U-shaped pipe (211), a first exhaust straight pipe (212), and a second exhaust U-shaped pipe (213) connected in sequence. The first exhaust pipe (21) is connected to the first compressor (11) through the first exhaust U-shaped pipe (211) and to the exhaust tee (23) through the second exhaust U-shaped pipe (213). The second exhaust pipe (22) includes a third exhaust U-shaped pipe (221), a second exhaust straight pipe (222), and a fourth exhaust U-shaped pipe (223) connected in sequence. The second exhaust pipe (22) is connected to the second compressor (13) through the third exhaust U-shaped pipe (221) and to the exhaust tee (23) through the fourth exhaust U-shaped pipe (223). In a top view, the angle between the first exhaust U-shaped pipe (211) and the third connecting line (27) is 0°-5°, and the angle between the third exhaust U-shaped pipe (221) and the second connecting line (26) is 0°-5°.

2. The exhaust pipe assembly of an air conditioner outdoor unit according to claim 1, characterized in that, The first connecting line (25), the second connecting line (26), and the third connecting line (27) form a triangle. The exhaust pipe assembly (2) includes an exhaust tee (23), which is connected to the exhaust port of the first compressor (11), the exhaust port of the second compressor (13), and the inlet of the oil separator (17). From a top view, the exhaust tee (23) is located within the triangle.

3. The exhaust pipe assembly of an air conditioner outdoor unit according to claim 1, characterized in that, From a top-down perspective, the angle between the first exhaust U-shaped pipe (211) and the second exhaust U-shaped pipe (213) is denoted as D, where 50°≤D≤70°; and the angle between the third exhaust U-shaped pipe (221) and the fourth exhaust U-shaped pipe (223) is denoted as E, where 55°≤E≤75°.

4. The exhaust pipe assembly of an air conditioner outdoor unit according to claim 1, characterized in that, The third exhaust pipe (24) includes an exhaust bend (241), an exhaust transition pipe (242), and an exhaust connecting pipe (243) connected in sequence. The third exhaust pipe (24) is connected to the exhaust tee (23) through the exhaust bend (241) and to the inlet of the oil separator (17) through the exhaust connecting pipe (243).

5. The exhaust pipe assembly of an air conditioner outdoor unit according to claim 4, characterized in that, The exhaust transition pipe (242) includes a first pipe section (2421) and a second pipe section (2422). The exhaust transition pipe (242) is connected to the exhaust bend (241) through the first pipe section (2421) and to the exhaust connecting pipe (243) through the second pipe section (2422). The first pipe section (2421) and the exhaust bend (241) are coplanar, and the second pipe section (2422) and the exhaust connecting pipe (243) are coplanar.

6. The exhaust pipe assembly of an air conditioner outdoor unit according to claim 5, characterized in that, The exhaust bend (241) includes a vertical pipe section (2411) and a horizontal pipe section (2412) connected in sequence. The included angle between the vertical pipe section (2411) and the horizontal pipe section (2412) is 90°. In the vertical plane where the first pipe section (2421) and the exhaust bend (241) are located, the included angle between the first pipe section (2421) and the horizontal pipe section (2412) of the exhaust bend (241) is denoted as A1, where 90°≤A1≤120°. The exhaust connecting pipe (243) is set in the vertical direction. The included angle between the second pipe section (2422) and the exhaust connecting pipe (243) is denoted as A3, where 120°≤A3≤150°. The included angle between the first pipe section (2421) and the second pipe section (2422) is denoted as A2, where 140°≤A2≤160°.

7. An air conditioner, characterized in that, The air conditioner includes a first compressor (11), a second compressor (13), an oil separator (17), and an exhaust pipe assembly of the outdoor unit of the air conditioner according to any one of claims 1-6. The exhaust pipe assembly (2) is connected to the exhaust port of the first compressor (11), the exhaust port of the second compressor (13), and the inlet of the oil separator (17), respectively.

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