Air conditioning system

Abstract

The utility model discloses an air-conditioning system, which comprises a compressor, an air inlet, an air outlet, an air inlet and an air outlet, the valve assembly is provided with a first connector, a second connector, a third connector and a fourth connector, the first connector communicates with the exhaust port, the fourth connector communicates with the air suction port, and the first connector communicates with the second connector or the third connector in a switchable mode; the indoor heat exchanger is provided with a first end and a second end, and the first end communicates with the second connector; the outdoor heat exchanger is provided with a third end and a fourth end, and the third end communicates with the third connector; the second end is connected with the fourth end through the first pipe, the capillary pipe is connected between the first pipe and the outdoor heat exchanger in series, and the capillary pipe exchanges heat with the second end and / or the first pipe. According to the air conditioning system, oil blockage during throttling of the capillary tube can be effectively avoided, so that the heating effect is effectively guaranteed, in addition, the structure can be effectively simplified, and the cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] The hydrocarbon refrigerant R290, hailed by the industry as one of the most promising environmentally friendly refrigerants for its excellent environmental friendliness (ODP = 0, GWP = 3), is, however, inherently flammable and explosive. However, R290's inherent flammability and explosiveness often lead to low R290 charge levels in air conditioning systems. To achieve higher heating capacity, increasing compressor displacement is often the solution. However, extremely low charge levels and high compressor displacement can easily lead to increased compressor oil solubility in R290 variable-frequency air conditioning systems at low temperatures, resulting in insufficient refrigerant flow. This, combined with excessively low temperatures after throttling during the initial startup phase of the compressor and increased oil viscosity, can easily lead to oil blockage in the system's cold components.

[0003] Existing methods for preventing oil blockage in R290 air conditioning systems primarily involve replacing lubricants with lower pour points to reduce viscosity at low temperatures and improve low-temperature fluidity. Another approach involves reducing compressor frequency and increasing the initial opening of the electronic expansion valve under low-temperature conditions to suppress the rapid drop in refrigerant temperature after throttling, thereby preventing an increase in compressor oil viscosity.

[0004] Currently, R290 air conditioning systems have large compressor displacements, and replacing lubricants with lubricants that have a lower pour point and meet the requirements of R290 air conditioning systems is costly. Low-temperature oil blockage can be effectively addressed by reducing compressor frequency and increasing the initial opening of the electronic expansion valve, but electronic expansion valve systems are expensive. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an air conditioning system that can effectively avoid oil blockage during capillary throttling, thereby effectively ensuring heating effects, and can also effectively simplify the structure and reduce costs.

[0006] According to the air-conditioning system of the present invention, the air-conditioning system includes: a compressor, the compressor having an air intake port and an air exhaust port; a valve assembly, the valve assembly having a first interface, a second interface, a third interface and a fourth interface, the first interface being connected to the air exhaust port, the fourth interface being connected to the air intake port, and the first interface being switchably connected to the second interface or the third interface; an indoor heat exchanger, the indoor heat exchanger having a first end and a second end, the first end being connected to the second interface; an outdoor heat exchanger, the outdoor heat exchanger having a third end and a fourth end, the third end being connected to the third interface; a first tube and a capillary tube, the second end and the fourth end being connected through the first tube, the capillary tube being connected in series between the first tube and the outdoor heat exchanger, and the capillary tube exchanging heat with the second end and / or the first tube.

[0007] According to the air conditioning system of the present invention, a compressor, a valve assembly, an indoor heat exchanger, an outdoor heat exchanger, a first tube, and a capillary tube are provided in the air conditioning system. The compressor has an air intake port and an air exhaust port. The valve assembly has a first interface, a second interface, a third interface, and a fourth interface. The first interface is connected to the air exhaust port, the fourth interface is connected to the air intake port, and the first interface can be switchably connected to the second interface or the third interface. The indoor heat exchanger has a first end and a second end, the first end is connected to the second interface. The outdoor heat exchanger has a third end and a fourth end, the third end is connected to the third interface, and the second end and the fourth end are connected via a first tube. The capillary tube is connected in series between the first tube and the outdoor heat exchanger. The capillary tube exchanges heat with the second end and / or the first tube. This effectively increases the temperature of the capillary tube when the air conditioning system is in heating mode under low temperature conditions. This prevents oil blockage in the capillary tube, effectively ensures heating efficiency, and thus effectively improves the reliability of the air conditioning system. Furthermore, the structure can be effectively simplified and the cost can be reduced.

[0008] In some embodiments, the capillary tube is in heat exchange with the first tube.

[0009] In some embodiments, the capillary is in contact with the outer wall of the first tube and bends and extends on the outer wall of the first tube.

[0010] In some embodiments, the capillary tube is wrapped around the first tube.

[0011] In some embodiments, a heat conductor is provided between the capillary tube and the first tube.

[0012] In some embodiments, the air conditioning system further includes: a thermal insulation component, which is coated on the outside of the capillary tube and the first tube.

[0013] In some embodiments, the capillary tube is connected to the first tube by bonding, clamping or welding.

[0014] In some embodiments, along the flow direction of the refrigerant, the extension length of the capillary tube is 400 mm-1300 mm.

[0015] In some embodiments, the capillary tube is a copper tube, and / or the first tube is a copper tube.

[0016] In some embodiments, the valve assembly is a four-way reversing valve.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of an air-conditioning system according to an embodiment of the present invention, wherein the air-conditioning system is in heating mode, and the arrows indicate the flow direction of the refrigerant;

[0019] Figure 2 It is a schematic diagram of an air-conditioning system according to an embodiment of the present invention, wherein the air-conditioning system is in cooling mode and the arrows point to the flow direction of the refrigerant.

[0020] Reference numerals:

[0021] 100. Air conditioning system;

[0022] 10. Compressor; 11. Air intake; 12. Air exhaust;

[0023] 20. Valve assembly; 21. First interface; 22. Second interface; 23. Third interface; 24. Fourth interface;

[0024] 30. Indoor heat exchanger; 31. First end; 32. Second end;

[0025] 40. Outdoor heat exchanger; 41. Third end; 42. Fourth end;

[0026] 50. First tube; 51. Capillary tube. DETAILED DESCRIPTION

[0027] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] Reference below Figure 1 and Figure 2 An air conditioning system 100 according to an embodiment of the present invention is described.

[0029] like Figure 1 and Figure 2 As shown, an air conditioning system 100 according to an embodiment of the present invention includes: a compressor 10 , a valve assembly 20 , an indoor heat exchanger 30 , an outdoor heat exchanger 40 , a first pipe 50 and a capillary tube 51 .

[0030] The compressor 10 has an intake port 11 and an exhaust port 12; the valve assembly 20 has a first interface 21, a second interface 22, a third interface 23 and a fourth interface 24, the first interface 21 is connected to the exhaust port 12, the fourth interface 24 is connected to the intake port 11, and the first interface 21 can be switchably connected to the second interface 22 or the third interface 23; the indoor heat exchanger 30 has a first end 31 and a second end 32, the first end 31 is connected to the second interface 22; the outdoor heat exchanger 40 has a third end 41 and a fourth end 42, the third end 41 is connected to the third interface 23; the second end 32 and the fourth end 42 are connected through a first tube 50, the capillary tube 51 is connected in series between the first tube 50 and the outdoor heat exchanger 40, and the capillary tube 51 exchanges heat with the second end 32 and / or the first tube 50.

[0031] Specifically, one end of the first tube 50 is connected to the second end 32, and the other end of the first tube 50 is connected to the fourth end 42, thereby connecting the indoor heat exchanger 30 and the outdoor heat exchanger 40. The capillary tube 51 is connected in series to the first tube 50. For example, the capillary tube 51 is configured to exchange heat with the second end 32; for another example, the capillary tube 51 is configured to exchange heat with the first tube 50; for another example, the capillary tube 51 is configured to exchange heat with the second end 32 and the first tube 50.

[0032] When the compressor 10 is working, the compressor 10 can compress the refrigerant into a high-temperature and high-pressure gas and discharge it out of the exhaust port 12. Figure 1 As shown, when the first interface 21 is connected to the second interface 22, the indoor heat exchanger 30 can function as a condenser, the outdoor heat exchanger 40 can function as an evaporator, and the refrigerant can flow sequentially through the indoor heat exchanger 30 and the outdoor heat exchanger 40. When the refrigerant flows through the indoor heat exchanger 30, it exchanges heat with the surrounding air, releasing heat to lower the temperature of the refrigerant, and the refrigerant changes from a gaseous state to a liquid state. When the refrigerant flows through the outdoor heat exchanger 40, the refrigerant can absorb heat from the surrounding air, lowering the temperature of the surrounding air, and the refrigerant changes from a liquid state to a gaseous state.

[0033] For example Figure 2As shown, when the first interface 21 is connected to the third interface 23, the outdoor heat exchanger 40 can function as a condenser, the indoor heat exchanger 30 can function as an evaporator, and the refrigerant can flow sequentially through the outdoor heat exchanger 40 and the indoor heat exchanger 30. When the refrigerant flows through the outdoor heat exchanger 40, it exchanges heat with the surrounding air, releasing heat, thereby lowering the temperature of the refrigerant and transforming the refrigerant from a gaseous state to a liquid state. When the refrigerant flows through the indoor heat exchanger 30, the refrigerant can absorb heat from the surrounding air, lowering the temperature of the surrounding air and transforming the refrigerant from a liquid state to a gaseous state.

[0034] In this embodiment, when the air-conditioning system 100 is in heating mode, the first interface 21 is connected to the second interface 22, and the compressor 10 can compress the refrigerant entering from the air intake port 11 into a high-temperature and high-pressure gas and discharge it out of the exhaust port 12. The refrigerant flows through the first interface 21, the second interface 22 and the first end 31 in sequence, and enters the indoor heat exchanger 30 from the first end 31. The refrigerant condenses and releases heat in the indoor heat exchanger 30 and changes from gas to liquid. It then flows out of the indoor heat exchanger 30 from the second end 32, and then flows through the first tube 50, the capillary tube 51 and the fourth end 42 in sequence, and enters the outdoor heat exchanger 40 from the fourth end 42. The refrigerant evaporates and absorbs heat in the outdoor heat exchanger 40 and changes from liquid to gas. It then flows out of the outdoor heat exchanger 40 from the third end 41 and finally flows to the compressor 10, thereby completing the circulation of the refrigerant in the air-conditioning system 100.

[0035] It should be noted that the lubricating oil properties of the compressor 10 of the air conditioning system 100 primarily include solubility, pour point, and viscosity. The pour point refers to the lowest temperature at which the oil will flow when cooled under specified conditions. During the initial heating startup phase of the air conditioning system 100, the compressor 10 instantly draws refrigerant from the outdoor heat exchanger 40 back into the compressor 10, causing a rapid drop in temperature after throttling.

[0036] Therefore, when the refrigerant and lubricant mixture passes through the throttling element, it is prone to experiencing a sudden drop in pressure and temperature, which can cause changes in the lubricant's solubility and viscosity. If the temperature difference before and after throttling is too large, the oil content in the refrigerant will decrease, and the lubricant's viscosity will increase exponentially with decreasing temperature. This can easily cause oil accumulation in low-temperature components of the air conditioning system 100, such as the capillary tube 51 and the evaporation line. If the temperature at this point falls below the oil's pour point, solid paraffin will precipitate, reducing heat exchange performance and compressor 10 reliability.

[0037] In the present application, when the refrigerant flows through the indoor heat exchanger 30, the refrigerant condenses and releases heat, leaving residual heat in the second end 32 and the first tube 50. The second end 32 and the fourth end 42 are connected via the first tube 50, and the capillary tube 51 is serially connected to the first tube 50 and configured to exchange heat with the second end 32 and / or the first tube 50. This allows the capillary tube 51 to exchange heat with the second end 32 or the first tube 50 when throttling, thereby effectively heating the capillary tube 51 and effectively increasing the temperature at the throttling outlet of the capillary tube 51. This prevents oil blockage in the capillary tube 51 and improves the reliability of the heating mode of the air conditioning system 100. In addition, the capillary tube 51 has a simple structure, which can effectively reduce costs.

[0038] According to the air conditioning system 100 of the embodiment of the present invention, a compressor 10, a valve assembly 20, an indoor heat exchanger 30, an outdoor heat exchanger 40, a first tube 50 and a capillary tube 51 are set in the air conditioning system 100, the compressor 10 has an air intake port 11 and an air exhaust port 12, the valve assembly 20 has a first interface 21, a second interface 22, a third interface 23 and a fourth interface 24, the first interface 21 is connected to the air exhaust port 12, the fourth interface 24 is connected to the air intake port 11, the first interface 21 can be switched to communicate with the second interface 22 or the third interface 23, the indoor heat exchanger 30 has a first end 31 and a second end 32, the first end 31 is connected to the second port 22, the outdoor heat exchanger 40 has a third end 41 and a fourth end 42, the third end 41 is connected to the third port 23, the second end 32 and the fourth end 42 are connected via a first tube 50, and the capillary tube 51 is connected in series between the first tube 50 and the outdoor heat exchanger 40. The capillary tube 51 exchanges heat with the second end 32 and / or the first tube 50, effectively increasing the temperature of the capillary tube 51 when the air conditioning system 100 is in heating mode under low temperature conditions, thereby preventing oil blockage in the capillary tube 51, thereby effectively ensuring the heating effect and effectively improving the reliability of the air conditioning system 100. In addition, the structure can be effectively simplified and the cost can be reduced.

[0039] In one embodiment of the present invention, Figure 1 As shown, the capillary tube 51 exchanges heat with the first tube 50. In this embodiment, by arranging the capillary tube 51 to exchange heat with the first tube 50, the arrangement space of the capillary tube 51 can be effectively optimized, and the arrangement of the capillary tube 51 is facilitated.

[0040] In one embodiment of the present invention, Figure 1 As shown, the capillary 51 is in contact with the outer wall of the first tube 50 and bends and extends on the outer wall of the first tube 50 .

[0041] For example, the outer wall of the capillary tube 51 is directly attached to the outer wall of the first tube 50, thereby directly utilizing the temperature of the first tube 50 surface to heat the capillary tube 51, thereby preheating the refrigerant and lubricating oil before entering the capillary tube 51, thereby improving the efficiency of heat conduction. The capillary tube 51 bends and extends on the outer wall of the first tube 50, effectively increasing the contact area between the capillary tube 51 and the outer wall of the first tube 50, and ensuring that the capillary tube 51 is heated evenly, avoiding local overheating or overcooling, thereby effectively improving the heat exchange effect.

[0042] This embodiment can effectively improve the efficiency of heat exchange in the capillary tube 51 and effectively enhance the effect of heat exchange in the capillary tube 51 by fitting the capillary tube 51 to the outer wall surface of the first tube 50 and bending and extending on the outer wall surface of the first tube 50, thereby ensuring that the lubricating oil in the capillary tube 51 can be effectively heated.

[0043] In one embodiment of the present invention, Figure 1 As shown, the capillary tube 51 is wound around the first tube 50. For example, the capillary tube 51 can be tightly wound around the outer wall of the first tube 50 using a spiral winding method, thereby maximizing the contact area between the capillary tube 51 and the outer wall of the first tube 50, thereby further improving the heat conduction efficiency of the capillary tube 51. In addition, winding the capillary tube 51 around the first tube 50 can make the capillary tube 51 and the first tube 50 more compact, optimize the layout of the capillary tube 51, and save installation space for the capillary tube 51.

[0044] In this embodiment, by winding the capillary tube 51 around the first tube 50, the contact area between the capillary tube 51 and the outer wall of the first tube 50 is further increased, thereby further improving the heat conduction efficiency of the capillary tube 51. In addition, the installation space of the capillary tube 51 can be effectively saved.

[0045] In one embodiment of the present invention, Figure 1 As shown, a heat conducting member is provided between the capillary 51 and the first tube 50. Specifically, the heat conducting member can effectively conduct the heat of the first tube 50 to the capillary 51. Furthermore, the heat conducting member can be a filling layer of metal powder.

[0046] On the one hand, since the thermal conductivity of metal is much higher than that of other materials, setting the heat conductor as a filling layer of metal powder can effectively improve the thermal conductivity between the first tube 50 and the capillary tube 51. On the other hand, the metal powder can effectively fill the gap between the first tube 50 and the capillary tube 51 to avoid the formation of an air layer between the first tube 50 and the capillary tube 51, which may lead to a decrease in the heat transfer efficiency between the first tube 50 and the capillary tube 51.

[0047] This embodiment can further improve the heat exchange efficiency between the first tube 50 and the capillary tube 51 by providing a heat conductor between the capillary tube 51 and the first tube 50, thereby further improving the heating effect of the lubricating oil in the capillary tube 51 and effectively improving the fluidity of the lubricating oil in the capillary tube 51.

[0048] In one embodiment of the present invention, Figure 1 As shown, the air conditioning system 100 further includes an insulation member that covers the outer sides of the capillary tube 51 and the first tube 50. Specifically, the insulation member is made of a material with low thermal conductivity to reduce heat transfer from the first tube 50 and the capillary tube 51 to the external environment. For example, the insulation member can be made of foam plastic or fiberglass.

[0049] For example, the insulation can be secured around the outside of the first tube 50 and the capillary tube 51 by wrapping, sleeve, or wrapping, thereby ensuring that the entire heat exchange area is insulated, thereby effectively reducing heat loss. Furthermore, the insulation has excellent wear and corrosion resistance, thereby effectively protecting the first tube 50 and the capillary tube 51.

[0050] This embodiment provides a heat-insulating member in the air-conditioning system 100. The heat-insulating member covers the outer sides of the capillary tube 51 and the first tube 50, effectively reducing unnecessary heat loss and ensuring efficient heat conduction between the first tube 50 and the capillary tube 51. Furthermore, the heat-insulating member effectively protects the first tube 50 and the capillary tube 51, thereby effectively extending their service life.

[0051] In one embodiment of the present invention, Figure 1 As shown, the capillary tube 51 is bonded, clamped, or welded to the first tube 50. For example, the capillary tube 51 and the first tube 50 are bonded using an adhesive, thereby securing the capillary tube 51 to the first tube 50 and providing a certain degree of flexibility, thereby facilitating vibration absorption. Furthermore, the bonding operation is convenient and applicable to a variety of materials.

[0052] For example, the capillary tube 51 and the first tube 50 are fixedly connected by a clamp or a fastener, which allows for quick installation and removal of the capillary tube 51, saving installation time and effectively reducing maintenance difficulty. For another example, the capillary tube 51 and the first tube 50 are fixedly connected by welding, which effectively improves the structural strength of the connection and ensures the reliability of the connection.

[0053] This embodiment effectively avoids vibration caused by the mixture of refrigerant and lubricating oil flowing through the capillary tube 51 and the first tube 50 by bonding, clamping or welding the capillary tube 51 and the first tube 50, thereby effectively avoiding collision between the capillary tube 51 and the first tube 50, thereby effectively improving safety.

[0054] In one embodiment of the present invention, Figure 1 As shown, the capillary tube 51 extends in a length ranging from 400 mm to 1300 mm along the flow direction of the refrigerant. For example, the capillary tube 51 extends in a length ranging from 400 mm to 500 mm along the flow direction of the refrigerant.

[0055] Furthermore, the inner diameter of the capillary 51 is 1 mm to 2 mm, and the outer diameter of the capillary 51 is 2.5 mm to 3.2 mm. For example, the inner diameter of the capillary 51 may be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2 mm. For example, the outer diameter of the capillary 51 may be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, and 3.2 mm.

[0056] It should be noted that one of the main functions of the capillary tube 51 is to act as a throttling device, controlling the flow of refrigerant from the high-pressure side to the low-pressure side. An appropriate length ensures the correct pressure and flow rate to meet the system design requirements. Furthermore, heat exchange between the capillary tube 51 and the first tube 50 requires sufficient time and surface area for efficient heat transfer. A longer capillary tube 51 provides more contact area, helping to improve heat exchange efficiency.

[0057] The capillary tube 51 should extend at least 400 mm in the refrigerant flow direction to ensure it is long enough to perform basic throttling and provide a sufficient heat exchange area. If the length is too short, the refrigerant flow may be excessive, preventing effective pressure reduction and affecting the cooling or heating performance of the system.

[0058] The maximum extension length of the capillary tube 51 along the refrigerant flow direction is 1300 mm, taking into account practical installation space limitations and cost-effectiveness. An excessively long capillary tube 51 not only increases material costs but may also cause unnecessary resistance losses, impacting overall system efficiency. Furthermore, an excessively long capillary tube 51 may increase system response time, hindering rapid adjustment.

[0059] In this embodiment, the extension length of the capillary tube 51 is set to 400mm-1300mm along the flow direction of the refrigerant, which can ensure the throttling effect of the capillary tube 51, the heat exchange efficiency between the first gate and the capillary tube 51, and the manufacturing cost.

[0060] In one embodiment of the present invention, Figure 1As shown, capillary tube 51 is a copper tube, and / or first tube 50 is a copper tube. For example, capillary tube 51 is a copper tube; another example, first tube 50 is a copper tube; another example, capillary tube 51 is a copper tube and first tube 50 is a copper tube. It should be noted that copper tubes have extremely high thermal conductivity and can transfer heat quickly and efficiently.

[0061] Using copper tubes for the first tube 50 or the capillary tube 51 can effectively improve the heat transfer efficiency between the first tube 50 and the capillary tube 51, thereby effectively improving the performance of the air conditioning system 100 in the heating mode. Furthermore, copper tubes have excellent corrosion resistance and mechanical strength, effectively improving the stability and reliability of the first tube 50 and the capillary tube 51 during use.

[0062] In this embodiment, the capillary tube 51 or the first tube 50 is set as a copper tube, which can not only effectively improve the heat conduction efficiency between the first tube 50 and the capillary tube 51, but also effectively increase the service life of the first tube 50 and the capillary tube 51, thereby effectively reducing the maintenance requirements of the first tube 50 and the capillary tube 51, and thus effectively saving maintenance costs.

[0063] In one embodiment of the present invention, Figure 1 As shown, valve assembly 20 is a four-way reversing valve. Specifically, the main function of the four-way reversing valve is to change the flow direction of the refrigerant, thereby achieving mode switching of the air conditioning system 100. In other words, it can direct the high-temperature and high-pressure gas discharged from the compressor 10 to different heat exchangers to adapt to different operating modes.

[0064] Furthermore, when the air-conditioning system 100 is in heating mode, the first interface 21 is connected to the second interface 22, and the compressor 10 can compress the refrigerant entering from the air intake 11 into a high-temperature and high-pressure gas and discharge it from the exhaust port 12. The refrigerant flows through the first interface 21, the second interface 22 and the first end 31 in sequence, and enters the indoor heat exchanger 30 from the first end 31.

[0065] When the air-conditioning system 100 is in cooling mode, the first interface 21 is connected to the third interface 23, and the compressor 10 can compress the refrigerant entering from the air intake 11 into a high-temperature and high-pressure gas and discharge it from the exhaust port 12. The refrigerant flows through the first interface 21, the third interface 23 and the third end 41 in sequence, and enters the outdoor heat exchanger 40 from the third end 41.

[0066] In this embodiment, the valve assembly 20 is set as a four-way reversing valve, which can correctly connect the first interface 21 with the second interface 22 or the third interface 23, so that the air-conditioning system 100 can quickly switch between heating mode and cooling mode, thereby effectively improving the convenience of user operation and the reliability of the air-conditioning system 100.

[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0069] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0071] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioning system, characterized in that: include: a compressor having an air intake and an air discharge port; a valve assembly having a first interface, a second interface, a third interface, and a fourth interface, wherein the first interface is in communication with the exhaust port, the fourth interface is in communication with the intake port, and the first interface is switchably in communication with the second interface or the third interface; an indoor heat exchanger having a first end and a second end, wherein the first end is in communication with the second interface; an outdoor heat exchanger, the outdoor heat exchanger having a third end and a fourth end, the third end being in communication with the third interface; A first tube and a capillary tube, the second end and the fourth end are connected through the first tube, the capillary tube is connected in series between the first tube and the outdoor heat exchanger, and the capillary tube exchanges heat with the second end and / or the first tube.

2. The air conditioning system according to claim 1, characterized in that The capillary tube is in heat exchange with the first tube.

3. The air conditioning system according to claim 2, characterized in that The capillary is in contact with the outer wall of the first tube and is bent and extended on the outer wall of the first tube.

4. The air conditioning system according to claim 2 or 3, characterized in that: The capillary tube is wound around the first tube.

5. The air conditioning system according to claim 2 or 3, characterized in that: A heat conducting member is provided between the capillary tube and the first tube.

6. The air conditioning system according to claim 2 or 3, characterized in that: Also includes: A heat-insulating component is coated on the outer sides of the capillary tube and the first tube.

7. The air conditioning system according to claim 2, characterized in that The capillary tube is connected to the first tube by bonding, clamping or welding.

8. The air conditioning system according to any one of claims 1 to 3, characterized in that: Along the flow direction of the refrigerant, the extension length of the capillary tube is 400 mm-1300 mm.

9. The air conditioning system according to any one of claims 1 to 3, characterized in that: The capillary tube is a copper tube, and / or the first tube is a copper tube.

10. The air conditioning system according to any one of claims 1 to 3, characterized in that: The valve assembly is a four-way reversing valve.

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