Multi-directional duct, plenum, and air conditioning system

Abstract

The application relates to a multi-directional pipe, a gas collecting pipe and an air conditioning system. The multi-directional pipe comprises a main pipe part, a gas pipe part and an oil return hole. The main pipe part comprises a first lumen extending in a first direction. The gas pipe part extends in a second direction and is connected to the main pipe part. The gas pipe part comprises a gas lumen extending in the second direction. The gas lumen is in communication with the first lumen. The first direction is different from the second direction. The oil return hole is arranged in the main pipe part and is in communication with the first lumen. The gas pipe part and the oil return hole are arranged on opposite sides of the main pipe part in the second direction.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to a multi-directional pipe, a gas manifold, and an air conditioning system. Background Technology

[0002] For air-cooled heat pump refrigeration units, a gas-liquid separator is usually required before the compressor suction inlet to prevent liquid carryover during mode switching. For large air-cooled heat pump units, the water-side heat exchanger itself uses a shell-and-tube heat exchanger with a certain gas-liquid separation function. Ordinary gas-liquid separators become meaningless in cooling mode. More importantly, the pressure drop generated by the gas-liquid separator will lead to a decrease in unit performance. Utility Model Content

[0003] This application provides a multi-directional pipe, a gas collection pipe, and an air conditioning system to address some or all of the shortcomings in the related technologies.

[0004] The first aspect of this application provides a multi-directional pipe, comprising: The main pipeline section includes a first cavity extending in a first direction; A tracheal section, extending along a second direction, connects to the main tracheal section; the tracheal section includes an air cavity extending along the second direction; the air cavity communicates with the first tracheal cavity; the first direction is distinct from the second direction; and An oil return hole is provided in the main pipeline section and communicates with the first pipeline cavity; The air pipe section and the oil return hole are located on opposite sides of the main pipe section in the second direction.

[0005] Furthermore, the main pipeline section is configured as a cylinder extending along the first direction; the oil return hole is disposed on the circumferential surface of the main pipeline section.

[0006] Furthermore, the multi-directional pipe also includes a first baffle disposed in the first pipe cavity; the first baffle is connected to the main pipe section; the first baffle includes a vent hole penetrating through the first baffle along the second direction; wherein the first baffle is disposed close to the air cavity; the vent hole connects the first pipe cavity and the air cavity.

[0007] Furthermore, the main pipeline includes a first pipe unit extending along a first direction and a second pipe unit extending along a second direction; the first pipe unit defines the first cavity; the main pipeline also includes a second cavity defined by the second pipe unit; the first pipe unit and the second pipe unit are connected; the first cavity and the second cavity are in communication. The second pipe unit includes an upper plane and a lower plane that are disposed opposite to each other along the second direction; the air pipe is disposed on the upper plane; and the oil return hole is disposed on the lower plane.

[0008] Furthermore, the multi-directional tube also includes a second baffle disposed in the second cavity; the second baffle includes a connecting unit and a blocking unit connected together; the blocking unit extends along the second direction and surrounds to form a communicating cavity; the extending direction of the connecting unit is different from that of the blocking unit; the wall surface of the second cavity is spaced apart from the blocking unit; the communicating cavity connects the second cavity and the air cavity.

[0009] Furthermore, the diameter of the first pipe unit is smaller than the diameter of the second pipe unit; and / or, the first pipe unit is connected to the second pipe unit between the upper plane and the lower plane, and there is a gap between the first pipe unit and the lower plane in the second direction.

[0010] A second aspect of this application provides a gas collecting pipe, including the multi-directional pipe and the vent pipe described in the foregoing embodiments; the vent pipe is used to connect to a finned heat exchanger; the vent pipe is connected to the main pipe.

[0011] This application provides an air conditioning system comprising, in three aspects, the gas collection pipe, compressor, reversing valve, shell-and-tube heat exchanger, and finned heat exchanger described in the foregoing embodiments; the exhaust port and intake port of the compressor are both connected to the reversing valve; the reversing valve is connected to the gas pipe section and the shell-and-tube heat exchanger; the oil return port is connected to the compressor; the finned heat exchanger is connected to the vent pipe; and the expansion valve is connected between the finned heat exchanger and the shell-and-tube heat exchanger.

[0012] Furthermore, the reversing valve includes a high-pressure port, a low-pressure port, a first switching port, and a second switching port; the high-pressure port is connected to the exhaust port of the compressor; the low-pressure port is connected to the intake port of the compressor; the first switching port is connected to the vent pipe; and the second switching port is connected to the shell-and-tube heat exchanger.

[0013] Furthermore, the air conditioning system also includes an ejector; the ejector includes a first inlet, a second inlet, and an ejector outlet; the first inlet is connected to the oil return hole; the second inlet is connected to the shell and tube heat exchanger; and the ejector outlet is connected to the compressor.

[0014] The technical solutions provided by the embodiments of this application may include the following beneficial effects: As can be seen from the above embodiments, the gas pipe section and the oil return hole of the multi-directional pipe of this application are arranged opposite to each other in the second direction. Therefore, when the multi-directional pipe is applied to an air conditioning system, the oil return hole is placed closer to the lower side in the direction of gravity, so that the lubricating oil in the fluid can be deposited at the bottom of the multi-directional pipe and flow into the compressor through the oil return hole. The gas pipe section is placed closer to the upper side in the direction of gravity, so that the less dense gas can approach the gas pipe section and leave the multi-directional pipe. When switching from cooling mode to heating mode, the fluid in the first chamber needs to flow out through the gas pipe section. At this time, the liquid part of the fluid is difficult to overcome gravity and enter the gas chamber. Therefore, the multi-directional pipe can ensure as much as possible that what leaves the multi-directional pipe section as possible is gas, thereby avoiding the phenomenon of liquid being drawn in when switching between cooling and heating modes. At the same time, the pressure drop is small when the multi-directional pipe is applied to the air conditioning system, which is beneficial to improving the performance of the air conditioning system.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The diagram shown is a perspective cross-sectional view of an embodiment of the multi-directional tube of this application. Figure 2 The diagram shown is a perspective cross-sectional view of another embodiment of the multi-directional tube of this application. Figure 3 The diagram shown is a simplified circuit diagram of an embodiment of the air conditioning system of this application, wherein Figure 3 application Figure 2 The multi-directional tube shown in the embodiment; Figure 4 The diagram shown is a simplified circuit diagram of another embodiment of the air conditioning system of this application, wherein... Figure 4 application Figure 1 The multi-directional tube shown in the embodiment.

[0018] Explanation of reference numerals in the attached figures: 100 Air conditioning system, 1 multi-directional pipe, 11 main pipe section, 111 first pipe cavity, 112 first pipe unit, 113 second pipe unit, 1131 upper plane, 1132 lower plane, 114 second pipe cavity, 12 gas pipe section, 121 gas cavity, 13 oil return hole, 14 first baffle, 141 vent hole, 15 second baffle, 151 connecting unit, 152 barrier unit, 153 connecting cavity, 2 vent pipe, 3 liquid collection pipe, 4 compressor, 5 shell and tube heat exchanger, 6 reversing valve, 7 finned heat exchanger, 8 ejector, 91A refrigeration oil return solenoid valve, 91B heating oil return solenoid valve, 91C refrigeration ejector oil return solenoid valve, 92 one-way valve, 93A refrigeration expansion valve, 93B heating expansion valve, X first direction, Y second direction. Detailed Implementation

[0019] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0020] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0021] refer to Figure 1 This application provides a multi-directional pipe 1 in its first aspect. The multi-directional pipe 1 includes a main pipe section 11, an air pipe section 12, and an oil return hole 13. The main pipe section 11 includes a first cavity 111 extending along a first direction X. The air pipe section 12 extends along a second direction Y and is connected to the main pipe section 11. The air pipe section 12 includes an air chamber 121 extending along the second direction Y. The air chamber 121 communicates with the first cavity 111. The oil return hole 13 is disposed on the main pipe section 11 and communicates with the first cavity 111. The air pipe section 12 and the oil return hole 13 are located on opposite sides of the main pipe section 11 in the second direction Y.

[0022] During the use of the multi-directional tube 1, the air pipe section 12 is positioned higher relative to the oil return hole 13 in the direction of gravity. This allows the lubricating oil, which cannot be liquefied in the gas-liquid mixture in the first pipe cavity 111, to leave the first pipe cavity 111 through the oil return hole 13, while the smaller gas mass can approach the air chamber 121 within the first pipe cavity 111, thus achieving gas-liquid separation. When the gas-liquid mixture in the first pipe cavity 111 needs to leave the air chamber 121, since the lubricating oil cannot be liquefied, it is difficult to overcome gravity and enter the air chamber 121. At this time, only the gas and a small amount of liquid in the gas-liquid mixture can enter the air chamber 121 and then leave the multi-directional tube 1, achieving effective gas-liquid separation.

[0023] In the embodiment shown in the accompanying drawings, the first direction X and the second direction Y are perpendicular, but this should be considered exemplary and not limiting. In other embodiments, the first direction X and the second direction Y can be at any angle, as long as they are not parallel. This application does not limit the specific angle.

[0024] Combination Figure 3 Based on this embodiment, a second aspect of this application also provides a gas collecting pipe. The gas collecting pipe includes a multi-directional pipe 1 and a vent pipe 2. The vent pipe 2 is used to connect to a finned heat exchanger 7. The vent pipe 2 is connected to a main pipe section 11. The gas collecting pipe of this application integrates a gas-liquid separation function, which can realize the gas-liquid separation of the cooling medium and efficient oil return when the gas collecting pipe is assembled in an air conditioning system.

[0025] In some alternative embodiments, the diameter of the vent pipe 2 is smaller than the diameter of the main pipe section 11. This change in diameter ensures that the bottom of the vent pipe is flush, allowing the lubricating oil to flow with the cooling medium gas to the oil return hole 13. In alternative embodiments, the diameter of the end of the vent pipe 2 furthest from the main pipe section 11 is smaller than the diameter of the end closest to the main pipe section 11. Alternatively, the diameter of the vent pipe 2 can be uniform.

[0026] Optionally, the main pipe section 11 is configured as a cylinder extending along the first direction X. An oil return hole 13 is provided on the circumferential surface of the main pipe section 11. When the cooling medium enters the first cavity 111, the lubricating oil, which cannot be vaporized, tends to deposit at the bottom of the cylinder. The design of the oil return hole allows the lubricating oil to leave the first cavity 111 through the oil return hole 13 and re-enter the circulation. The cylindrical main pipe section 11 facilitates later connection to the vent pipe 2 without requiring additional joint structures.

[0027] Furthermore, the multi-directional pipe 1 also includes a first baffle 14 disposed in the first cavity 111. The first baffle 14 is connected to the main pipe section 11. The first baffle 14 includes a vent hole 141 extending through the first baffle 14 in the second direction Y. The first baffle 14 is disposed close to the air chamber 121. The vent hole 141 connects the first cavity 111 and the air chamber 121. When the cooling medium in a gas-liquid mixed state needs to leave the first cavity from the air chamber 121, the first baffle 14 can block the liquid in the first cavity while allowing the gas to enter the air chamber 121 through the vent hole 141, thereby achieving better gas-liquid separation.

[0028] The first baffle 14 shown in the attached figure is a flat plate. In other embodiments, the first baffle 14 can be of any shape, such as an inverted "V" shape, an arc shape, etc. This application is not limited in this respect. In addition, there can be multiple vent holes 141, arranged in an array. Reducing the aperture of the vent holes 141 helps to further prevent liquid from entering the air chamber 121.

[0029] refer to Figure 2 In some optional embodiments, the main conduit section 11 includes a first pipe unit 112 extending along a first direction X and a second pipe unit 113 extending along a second direction Y. The first pipe unit 112 defines a first cavity 111. The main conduit section 11 also includes a second cavity 114 defined by the second pipe unit 113. The first pipe unit 112 and the second pipe unit 113 are connected. The first cavity 111 and the second cavity 114 are in communication. The second pipe unit 113 includes an upper plane 1131 and a lower plane 1132 disposed opposite each other along the second direction Y. The air pipe section 12 is disposed on the upper plane 1131. The oil return hole 13 is disposed on the lower plane 1132.

[0030] The first pipe unit 112 and the second pipe unit 113 form an intersecting main pipe section 11. The liquid in the gas-liquid mixture entering the second pipe cavity 114 from the first pipe unit 112 can exit the second pipe cavity 114 through the oil return hole 13, while the gas, due to its lighter mass, can accumulate near the upper plane 1131 and then enter the gas chamber 121 of the gas pipe section 12. The extension direction of the second pipe unit 113 is different from that of the first pipe unit 112, so the size of the multi-directional pipe 1 in the first direction X can be effectively controlled, thereby optimizing the size of the multi-directional pipe 1.

[0031] In an optional embodiment, the multi-directional tube 1 further includes a second baffle 15 disposed in the second cavity 114. The second baffle 15 includes a connecting unit 151 and a blocking unit 152 connected together. The blocking unit 152 extends along a second direction Y and surrounds a communicating cavity 153. The extending direction of the connecting unit 151 is different from that of the blocking unit 152. The wall surface of the second cavity 114 is spaced apart from the blocking unit 152. The communicating cavity 153 connects the second cavity 114 and the gas cavity 121. When the gas-liquid mixture enters the second cavity 114 from the first cavity 111, the gas-liquid mixture impacts the blocking unit 152 and then enters the second cavity 114 through the gap between the blocking unit 152 and the lower plane 1132. The blocking unit 152 can reduce the flow rate of the gas-liquid mixture, thereby prolonging the residence time of the gas-liquid mixture in the second cavity 114, which is beneficial to achieving gas-liquid separation in the second cavity 114 and the communicating cavity 153.

[0032] In some optional embodiments, the diameter R1 of the first tube unit 112 is smaller than the diameter R2 of the second tube unit 113. The second tube unit 113 connects the tracheal section 12 and the first tube unit 112, so the second cavity 114 is actually the part where gas-liquid mixture is separated. The diameter R1 of the first tube unit 112 is smaller than the diameter R2 of the second tube unit 113, so the volume of the second cavity 114 can be guaranteed, thereby ensuring the gas-liquid separation effect of the gas-liquid mixture in the second cavity 114. When a low pressure is generated at the tracheal section 12, the larger second cavity 114 can ensure that the liquid in the gas-liquid mixture is difficult to overcome gravity to enter the tracheal section 12, while only the lighter gas and liquid can enter the air chamber 121 under the action of low pressure and then leave the multi-directional tube 1.

[0033] In an optional embodiment, the first tube unit 112 is connected to the second tube unit 113 between the upper plane 1131 and the lower plane 1132, and there is a gap between the first tube unit 112 and the lower plane 1132 in the second direction Y. In this way, when the liquid with a larger mass in the gas-liquid mixture enters the second tube unit 113 through the first tube unit 112, it can be retained in the space between the first tube unit 112 and the lower plane 1132 under the action of gravity, and thus leave the second tube cavity 114 through the oil return hole 13.

[0034] Combination Figure 3 and Figure 4 Based on the above embodiments, this application also provides an air conditioning system 100. The air conditioning system 100 includes a gas collection pipe, a compressor 4, a reversing valve 6, a shell-and-tube heat exchanger 5, and a finned heat exchanger 7. The exhaust port and intake port of the compressor 4 are both connected to the reversing valve 6. The reversing valve 6 is connected to the gas pipe section 12 and the shell-and-tube heat exchanger 5. An oil return port 13 communicates with the compressor 4. The finned heat exchanger 7 is connected to the vent pipe 2. An expansion valve is connected between the finned heat exchanger 7 and the shell-and-tube heat exchanger 5.

[0035] In cooling mode, the high-temperature, high-pressure refrigerant exiting from the exhaust port of compressor 4 enters reversing valve 6, and under the action of reversing valve 6, enters the gas pipe section 12, then the main pipe section 11, and finally the vent pipe 2 and the finned heat exchanger 7. At this time, the finned heat exchanger 7 acts as a condenser, releasing heat and transforming the refrigerant into a high-pressure, medium-temperature fluid. After leaving the finned heat exchanger 7, the fluid enters the refrigeration expansion valve 93A, becoming a low-temperature, low-pressure fluid, and then flows into the shell-and-tube heat exchanger 5. The shell-and-tube heat exchanger 5 acts as an evaporator, where the fluid evaporates into a low-temperature, low-pressure gas and absorbs heat, thus achieving cooling at the shell-and-tube heat exchanger 5. The shell-and-tube heat exchanger 5 absorbs heat from the water in the indoor unit's water pipes, enabling the indoor unit to provide cooling. The fluid in the shell-and-tube heat exchanger 5 flows back to reversing valve 6 and enters the suction port of compressor 4, thus completing the circulation.

[0036] In heating mode, the refrigerant exiting from the discharge port of compressor 4 enters reversing valve 6 and, under the action of reversing valve 6, enters shell-and-tube heat exchanger 5. Shell-and-tube heat exchanger 5 acts as a condenser, thus releasing heat in the refrigerant, transforming it into a high-pressure, medium-temperature fluid. The heat from shell-and-tube heat exchanger 5 is transferred to the water pipes of the indoor unit, enabling the indoor unit to provide heating. The fluid exiting shell-and-tube heat exchanger 5 expands through heating expansion valve 93B, becoming a low-temperature, low-pressure gas-liquid two-phase mixture. It then flows through gas pipe 12 into first chamber 111 and through vent pipe 2 into finned heat exchanger 7 for evaporation and heat absorption, transforming into a low-temperature, low-pressure gas. The gas then flows back into reversing valve 6 and remains at the suction port of compressor 4, thus achieving refrigerant circulation.

[0037] In this application, the gas pipe section 12 and the oil return hole 13 of the multi-way pipe 1 are arranged opposite each other in the second direction Y. Therefore, when the multi-way pipe 1 is applied to the air conditioning system 100, the oil return hole 13 is placed closer to the lower side in the direction of gravity, so that the lubricating oil in the fluid can be deposited at the bottom of the multi-way pipe 1 and flow into the compressor 4 through the oil return hole 13. The gas pipe section 12 is placed closer to the upper side in the direction of gravity, so that the less dense gas can approach the gas pipe section 12 and leave the multi-way pipe 1. When switching from the cooling mode to the heating mode, the fluid in the first chamber needs to flow out through the gas pipe section 12. At this time, the liquid part of the fluid is difficult to overcome gravity and enter the gas chamber 121. Therefore, the multi-way pipe 1 can ensure as much as possible that what leaves the multi-way pipe 1 from the gas pipe section 12 is gas, thereby avoiding the phenomenon of liquid being drawn in when switching from the cooling mode to the heating mode.

[0038] As can be seen, the multi-directional pipe 1 of this application enables the air conditioning system 100 to eliminate the need for a liquid receiver and related components to prevent liquid carryover during suction, thereby effectively reducing the cost of the air conditioning system 100. Simultaneously, since the cooling and heating modes can be switched quickly without concern about liquid carryover during suction, the air conditioning system 100 can switch between different modes without stopping, ensuring the overall operating efficiency of the air conditioning system 100. Furthermore, the low pressure drop when the multi-directional pipe 1 is applied to the air conditioning system 100 is beneficial for improving the performance of the air conditioning system 100.

[0039] In the above embodiment, there can be multiple finned heat exchangers 7, each connected to a vent pipe 2 and also to a liquid collecting pipe 3. The refrigerant flowing through the finned heat exchangers 7 condenses and enters the liquid collecting pipe 3, thus flowing uniformly into the shell-and-tube heat exchanger 5 through a pipeline. This arrangement helps reduce the difficulty of connecting the finned heat exchangers 7 and the shell-and-tube heat exchanger 5.

[0040] In an optional embodiment of this application, the reversing valve 6 includes a high-pressure port, a low-pressure port, a first switching port, and a second switching port. The high-pressure port is connected to the exhaust port of the compressor 4. The low-pressure port is connected to the suction port of the compressor 4. The first switching port is connected to the vent pipe 2. The second switching port is connected to the shell-and-tube heat exchanger 5.

[0041] In cooling mode, the fluid leaving the exhaust port of compressor 4 enters the high-pressure port of reversing valve 6, and then leaves through the first switching port into the vent pipe 2. It then flows sequentially through the multi-way pipe 1, finned heat exchanger 7, refrigeration expansion valve 93A and shell and tube heat exchanger 5 before returning to the second switching port and leaving the low-pressure port of reversing valve 6 to enter compressor 4.

[0042] In heating mode, the fluid leaving the exhaust port of compressor 4 enters the high-pressure port of reversing valve 6, and then leaves through the second switching port into shell and tube heat exchanger 5. After passing through heating expansion valve 93B, multi-way pipe 1, vent pipe 2 and finned heat exchanger 7, it returns to the first switching port and leaves through the low-pressure port of reversing valve 6 into compressor 4.

[0043] As can be seen, the reversing valve 6 in this embodiment is a four-way valve, enabling the air conditioning system 100 to switch between cooling and heating modes, while also optimizing the piping of the air conditioning system 100 by sharing piping as much as possible. In other embodiments, the reversing valve 6 can also have more reversing functions, allowing fluid to enter more different thermal management components, thereby enabling the air conditioning system 100 to have more different thermal management functions.

[0044] To avoid interference between circuits, in some embodiments, the air conditioning system 100 also includes a one-way valve 92. For example... Figure 3As shown, a one-way valve 92 is positioned between the finned heat exchanger 7 and the refrigeration expansion valve 93A, allowing fluid to flow from the finned heat exchanger 7 through the one-way valve 92 and into the refrigeration expansion valve 93A. The one-way valve 92 is also positioned between the shell-and-tube heat exchanger 5 and the heating expansion valve 93B, allowing fluid to flow from the shell-and-tube heat exchanger 5 into the heating expansion valve 93B via the one-way valve 92. This arrangement facilitates switching between cooling and heating modes and avoids turbulence in the fluid flow within the piping.

[0045] like Figure 3 As shown, in an optional embodiment, the air conditioning system 100 further includes an ejector 8. The ejector 8 includes a first inlet, a second inlet, and an ejector outlet. The first inlet is connected to the oil return hole 13. The second inlet is connected to the shell-and-tube heat exchanger 5. The ejector outlet is connected to the compressor 4. In cooling mode, refrigerant flows into the shell-and-tube heat exchanger 5, and some lubricating oil also deposits in the shell-and-tube heat exchanger 5. The high flow rates of the fluid at the first inlet and the ejector outlet can drive the fluid in the shell-and-tube heat exchanger 5 through the second inlet into the ejector 8, and then back into the compressor 4. The ejector 8 enables the recovery of lubricating oil in the shell-and-tube heat exchanger 5.

[0046] In an optional embodiment, the air conditioning system 100 includes a cooling ejector return solenoid valve 91C and a heating return solenoid valve 91B. The cooling ejector return solenoid valve 91C is disposed between the oil return port 13 and the ejector 8. The heating ejector return solenoid valve 91B is disposed between the oil return port 13 and the compressor 4. In cooling mode, the fluid leaving the compressor 4 enters the multi-way pipe 1 under high temperature and pressure, and the fluid velocity leaving the oil return port 13 is high. When the cooling ejector return solenoid valve 91C opens, the high-velocity fluid flows through the ejector 8, thereby carrying the lubricating oil in the shell-and-tube heat exchanger 5 back to the compressor 4. In heating mode, the fluid pressure leaving the oil return port 13 is low, and it returns to the compressor 4 only through the heating return solenoid valve 91B without passing through the ejector 8, which simplifies the circuit configuration of the air conditioning system 100.

[0047] Furthermore, the air conditioning system 100 may also include a refrigerant return oil solenoid valve 91A, disposed between the ejector 8 and the shell-and-tube heat exchanger 5. In this way, the air conditioning system 100 can control whether oil return collection from the shell-and-tube heat exchanger 5 to the compressor 4 is required.

[0048] exist Figure 4In the illustrated embodiment, the oil return hole 13 of the multi-way pipe 1 is located at the bottom of the main pipe section 11 and is on the same surface as the vent pipe 2. Therefore, in the cooling mode, the lubricating oil in the cooling medium can enter the finned heat exchanger 7 through the vent pipe 2 to achieve lubricating oil circulation. At this time, the lubricating oil does not need to be guided by the ejector 8. In this embodiment, the cooling oil return solenoid valve 91A is disposed between the shell-and-tube heat exchanger 5 and the compressor 4 to control the lubricating oil collection of the shell-and-tube heat exchanger 5.

[0049] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A multi-directional pipe, characterized in that, include: The main pipeline section includes a first cavity extending in a first direction; The tracheal section extends along a second direction and connects to the main duct section; the tracheal section includes an air cavity extending along the second direction; the air cavity communicates with the first duct cavity; the first direction is distinct from the second direction; as well as An oil return hole is provided in the main pipeline section and communicates with the first pipeline cavity; The air pipe section and the oil return hole are located on opposite sides of the main pipe section in the second direction.

2. The multi-directional pipe according to claim 1, characterized in that, The main pipeline section is configured as a cylinder extending along the first direction; the oil return hole is disposed on the circumferential surface of the main pipeline section.

3. The multi-directional pipe according to claim 2, characterized in that, The multi-directional pipe further includes a first baffle disposed in the first pipe cavity; the first baffle is connected to the main pipe section; the first baffle includes a vent hole penetrating through the first baffle along the second direction; wherein the first baffle is disposed close to the air cavity; the vent hole connects the first pipe cavity and the air cavity.

4. The multi-directional pipe according to claim 1, characterized in that, The main pipeline includes a first pipe unit extending in a first direction and a second pipe unit extending in a second direction; the first pipe unit defines a first cavity; the main pipeline also includes a second cavity defined by the second pipe unit. The first tube unit and the second tube unit are connected; the first lumen and the second lumen are in communication; The second pipe unit includes an upper plane and a lower plane that are disposed opposite to each other along the second direction; the air pipe is disposed on the upper plane; and the oil return hole is disposed on the lower plane.

5. The multi-directional pipe according to claim 4, characterized in that, The multi-directional tube further includes a second baffle disposed in the second tube cavity; the second baffle includes a connecting unit and a blocking unit connected together; the blocking unit extends along the second direction and surrounds to form a communicating cavity; the extending direction of the connecting unit is different from that of the blocking unit; The wall of the second cavity is spaced apart from the barrier unit; The connecting cavity connects the second tube cavity and the air cavity.

6. The multi-directional pipe according to claim 4, characterized in that, The diameter of the first pipe unit is smaller than the diameter of the second pipe unit; and / or, The first tube unit is connected to the second tube unit between the upper plane and the lower plane, and there is a gap between the first tube unit and the lower plane in the second direction.

7. A gas collecting pipe, characterized in that, Includes a multi-directional pipe and a vent pipe as described in any one of claims 1-6; the vent pipe is used to connect to a finned heat exchanger; the vent pipe is connected to the main pipe.

8. An air conditioning system, characterized in that, The system includes the gas collecting pipe, compressor, reversing valve, expansion valve, shell-and-tube heat exchanger, and finned heat exchanger as described in claim 7; both the exhaust port and the intake port of the compressor are connected to the reversing valve; the reversing valve is connected to the gas pipe section and the shell-and-tube heat exchanger; the oil return hole is connected to the compressor; the finned heat exchanger is connected to the vent pipe; and the expansion valve is connected between the finned heat exchanger and the shell-and-tube heat exchanger.

9. The air conditioning system according to claim 8, characterized in that, The reversing valve includes a high-pressure port, a low-pressure port, a first switching port, and a second switching port; the high-pressure port is connected to the exhaust port of the compressor; the low-pressure port is connected to the intake port of the compressor; the first switching port is connected to the vent pipe; and the second switching port is connected to the shell-and-tube heat exchanger.

10. The air conditioning system according to claim 8, characterized in that, The air conditioning system also includes an ejector; the ejector includes a first inlet, a second inlet, and an ejector outlet; the first inlet is connected to the oil return hole; the second inlet is connected to the shell and tube heat exchanger; and the ejector outlet is connected to the compressor.

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