Six-way directional valve, air conditioning system and control method thereof

Abstract

The application provides a six-way reversing valve, an air conditioning system and a control method thereof. The six-way reversing valve comprises a valve body, a valve cavity is formed in the valve body, a sliding valve is arranged in the valve cavity, a first valve port, a second valve port, a third valve port, a fourth valve port and a fifth valve port are sequentially arranged in the valve body, the first valve port and the second valve port are respectively used for communicating with indoor heat exchange pipelines, the third valve port is used for communicating with a suction port of a compressor, the fourth valve port and the fifth valve port are respectively used for communicating with outdoor heat exchange pipelines, a sixth valve port is arranged in the valve body and is used for communicating with a discharge port of the compressor, when the sliding valve slides to a first working position, the first valve port communicates with the sixth valve port, the second valve port is blocked by the sliding valve, and the third valve port, the fourth valve port and the fifth valve port communicate with each other, when the sliding valve slides to a second working position, the first valve port communicates with the fifth valve port, the fourth valve port is blocked by the sliding valve, and the first valve port, the second valve port and the third valve port communicate with each other. The six-way reversing valve can increase the number of refrigerant flow paths and improve the heat exchange effect.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, specifically a six-way reversing valve. Background Technology

[0002] Currently, air conditioning systems switch between cooling and heating modes using four-way valves. When these four-way valves switch modes, the refrigerant flow direction in the heat exchanger is fixed: that is, when cooling and heating, the four-way valve can only switch the valve body to change the function of the indoor and outdoor heat exchangers to evaporators / condensers. The refrigerant flow direction is simply reversed. The switching of the four-way valve cannot change the refrigerant flow path, and it cannot make better use of the flow path characteristics of the heat exchanger when it is used as an evaporator / condenser, so the energy efficiency of the air conditioning system cannot reach its optimal state. Summary of the Invention

[0003] To address the above problems, this invention provides a six-way reversing valve, an air conditioning system, and a control method thereof. By adding valve ports, the number of refrigerant flow paths can be increased significantly or the direction of refrigerant flow can be changed, thereby improving the energy efficiency of the applicable air conditioning system.

[0004] This invention provides a six-way directional valve, comprising:

[0005] The valve body has a valve cavity formed inside it.

[0006] A slide valve, which is slidably disposed within the valve cavity;

[0007] The first valve port, the second valve port, the third valve port, the fourth valve port, and the fifth valve port are sequentially located on the valve body. The first valve port and the second valve port are used to connect with the indoor heat exchange pipeline, the third valve port is used to connect with the compressor's suction port, and the fourth valve port and the fifth valve port are used to connect with the outdoor heat exchange pipeline.

[0008] The sixth valve port, located on the valve body, is used to connect with the compressor's exhaust port;

[0009] When the slide valve slides to the first position, the first valve port is connected to the sixth valve port, the second valve port is blocked by the slide valve, and the third, fourth and fifth valve ports are connected to each other.

[0010] When the slide valve slides to the second position, the first valve port is connected to the fifth valve port, the fourth valve port is blocked by the slide valve, and the first valve port, the second valve port and the third valve port are connected to each other.

[0011] According to this technical solution, compared with the traditional four-way valve structure, the addition of a first or second valve port and a fourth or fifth valve port increases the number of refrigerant flow paths on the evaporator side, regardless of whether it is in cooling or heating mode. Compared with the conventional evaporator side (the evaporator side is the low-pressure side, with lower pressure than the condenser side; the fewer the flow paths, the longer each flow path, resulting in greater pressure loss, lower refrigerant flow velocity, and poor heat exchange effect), this solution can increase the refrigerant flow velocity in the flow path, reduce the pressure loss during the refrigerant flow process on the evaporator side, and improve the heat exchange effect. Furthermore, the first and fifth valve ports are located on the outside of the multiple valve ports, which facilitates the connection between the sixth valve port and the first or fifth valve port, thereby enabling the switching of operating modes. It also prevents cross-flow between the sixth and fifth valve ports on the inside, thus improving the operational stability of the six-way reversing valve. Furthermore, when the slide valve slides to the first position (heating mode), it blocks the second valve port. Since the second valve port connects to two indoor subcooling pipes (indoor heat exchange pipes), the refrigerant cannot enter the second valve port and can only flow along the two indoor subcooling pipes, changing the flow direction of the refrigerant and allowing it to be subcooled again, which helps improve heating capacity and heating efficiency. When the slide valve slides to the second position (cooling mode), it blocks the fourth valve port. Since the second valve port connects to two outdoor subcooling pipes (outdoor heat exchange pipes), the refrigerant cannot enter the fourth valve port and can only flow along the two outdoor subcooling pipes, changing the flow direction of the refrigerant and allowing it to be subcooled again, improving the cooling effect.

[0012] In an optional embodiment of the present invention, the slide valve includes a first connecting section, a second connecting section, and a third connecting section connected in sequence, wherein,

[0013] When the slide valve slides to the first position, the first connecting section is used to block the second valve port; when the slide valve slides to the second position, the third connecting section is used to block the fourth valve port.

[0014] The second connecting section protrudes to one side to form a connecting cavity that connects the other three valve ports that are not blocked by the slide valve and are not connected to the sixth valve port. The connecting cavity is isolated from the valve cavity.

[0015] According to this technical solution, the connecting cavity and the valve cavity are isolated, preventing refrigerant from the compressor outlet from entering the connecting cavity. Specifically, it prevents the refrigerant from the compressor outlet from entering the outdoor heat exchanger first in heating mode, and prevents the refrigerant from the compressor outlet from entering the indoor heat exchanger first in cooling mode, ensuring a normal refrigerant flow path in both cooling and heating modes and guaranteeing optimal cooling and heating performance. The slide valve structure in this solution is matched with the first to fifth valve ports, enabling mode switching, increasing the number of flow paths, and changing the refrigerant flow direction, making it highly practical.

[0016] In an optional technical solution of the present invention, the distance between the first valve port and the side wall of the corresponding valve cavity is not less than the length of the first connecting section.

[0017] According to the technical solution, when the slide valve moves to the second position, the third connecting section blocks the fourth valve port, and the first connecting section extends to the side wall between the first valve port and the corresponding valve cavity. The distance between the first valve port and the side wall of the valve cavity is not less than the length of the first connecting section, which can prevent interference between the first connecting section of the slide valve and the side wall of the corresponding valve cavity, thus affecting the stability of the slide valve position and preventing refrigerant leakage from the valve port.

[0018] In an optional technical solution of the present invention, the distance between the fifth valve port and the side wall of the corresponding valve cavity is not less than the length of the third connecting section.

[0019] According to the technical solution, when the slide valve moves to the first position, the first connecting section blocks the second valve port, and the third connecting section extends to the fifth valve port and the side wall of the corresponding valve cavity. The distance between the fifth valve port and the side wall of the valve cavity is not less than the length of the third connecting section, which can prevent interference between the third connecting section of the slide valve and the side wall of the corresponding valve cavity, thus affecting the stability of the slide valve position and preventing refrigerant leakage from the valve port.

[0020] In an optional technical solution of the present invention, the sixth valve port and any one of the second, third, fourth and fifth valve ports are located on opposite sides of the valve body.

[0021] According to this technical solution, by optimizing the positions of the sixth valve port, the second valve port, the third valve port, the fourth valve port, and the fifth valve port on the valve body, it is possible to switch modes and block valve ports by moving the slide valve, so that the refrigerant at the compressor outlet can smoothly enter through the first or fifth valve port and return to the compressor through the third valve port.

[0022] Another aspect of the present invention provides an air conditioning system, including the aforementioned six-way reversing valve.

[0023] The optional technical solutions of the present invention also include:

[0024] The compressor's discharge end is connected to the sixth port of a six-way reversing valve, and its suction end is connected to the third port of a six-way reversing valve.

[0025] The indoor heat exchanger assembly has its first end connected to the third valve port.

[0026] The first chamber subcooling pipe has its first end connected to the second valve port;

[0027] The second indoor subcooling pipe has its first end connected to the second valve port; the second end of the indoor heat exchanger assembly is connected to the second end of both the first indoor subcooling pipe and the second indoor subcooling pipe.

[0028] The first outdoor subcooling pipe is connected at its first end to the fourth valve port.

[0029] The second outdoor subcooling pipe is connected at the first end to the fourth valve port;

[0030] The outdoor heat exchanger assembly is connected at its first end to the fifth valve port, and the second end of the outdoor heat exchanger assembly, the second end of the first outdoor subcooling pipe, and the second end of the second outdoor subcooling pipe are all connected together.

[0031] A throttle valve is located between the second end of the second indoor subcooling pipe and the second end of the first outdoor subcooling pipe;

[0032] The first one-way valve is located between the second end of the subcooling pipe in the first chamber and the second end of the subcooling pipe in the second chamber. The first one-way valve is closed in heating mode and open in cooling mode.

[0033] The second check valve is located between the second end of the first outdoor subcooling pipe and the second end of the second outdoor subcooling pipe. The second check valve is open in heating mode and closed in cooling mode.

[0034] According to this technical solution, in either cooling or heating mode, the refrigerant at the outlet of the expansion valve is divided into four branches and returns to the compressor. This increases the number of flow paths on the evaporator side, improves the refrigerant flow rate, and reduces pressure loss, which is beneficial for improving the cooling effect. The refrigerant before the expansion valve or at the compressor outlet flows through the indoor heat exchanger assembly and then through two indoor subcooling pipes, or through the outdoor heat exchanger assembly and then through two outdoor subcooling pipes. This allows the condensed refrigerant to condense again through the indoor or outdoor subcooling pipes, thereby improving the heating or cooling effect.

[0035] In an optional technical solution of the present invention, the indoor heat exchanger group includes one set of indoor heat exchangers or multiple sets of indoor heat exchangers connected in parallel; the outdoor heat exchanger group includes one set of indoor heat exchangers or multiple sets of outdoor heat exchangers connected in parallel.

[0036] According to this technical solution, the number of heat exchangers in the indoor or outdoor heat exchanger group can be adjusted according to actual needs.

[0037] Another aspect of the present invention provides a control method for the above-mentioned air conditioning system, comprising the following steps:

[0038] In heating mode, the control slide valve slides to the first position, the sixth valve port is connected to the first valve port, the second valve port is blocked, and the third, fourth and fifth valve ports are connected to each other; the refrigerant at the compressor outlet passes through the first valve port, the indoor heat exchanger group, the first indoor subcooling pipe, the second indoor subcooling pipe, and the throttle valve in sequence, and then splits into four branches to return to the compressor.

[0039] In cooling mode, the control slide valve slides to the second position, the fourth valve port is blocked, and the first, second and third valve ports are connected to each other; the refrigerant at the compressor outlet passes through the fifth valve port, the outdoor heat exchanger group, the second outdoor subcooling pipe, the first outdoor subcooling pipe, and the throttling valve in sequence, and then splits into four branches to return to the compressor. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the six-way reversing valve in an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of the operation of the air conditioning system in heating mode according to the first embodiment of the present invention.

[0042] Figure 3 This is a schematic diagram of the operation of the air conditioning system in cooling mode according to the first embodiment of the present invention.

[0043] Figure 4 This is a schematic diagram of the operation of the air conditioning system in heating mode according to the second embodiment of the present invention.

[0044] Figure 5 This is a schematic diagram of the operation of the air conditioning system in cooling mode according to the second embodiment of the present invention.

[0045] Figure label:

[0046] Compressor 1; Six-way reversing valve 2; Valve body 21; Valve chamber 22; Slide valve 23; First connecting section 231; Second connecting section 232; Third connecting section 233; Connecting chamber 234; First valve port E1; Second valve port E2; Third valve port S; Fourth valve port C1; Fifth valve port C2; Sixth valve port D; Indoor heat exchanger assembly 3; First indoor subcooling pipe 41; Second indoor subcooling pipe 42; First outdoor subcooling pipe 51; Second outdoor subcooling pipe 52; Outdoor heat exchanger assembly 6; Throttling valve 7; First check valve 81; Second check valve 82. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] like Figure 1 , Figure 2 As shown, the present invention provides a six-way directional valve 2, comprising:

[0049] Valve body 21, the interior of valve body 21 forms valve cavity 22;

[0050] The slide valve 23 is slidably disposed within the valve cavity 22;

[0051] The first valve port E1, the second valve port E2, the third valve port S, the fourth valve port C1, and the fifth valve port C2 are sequentially provided on the valve body 21. The first valve port E1 and the second valve port E2 are respectively used to connect with the indoor heat exchange pipeline, the third valve port S is used to connect with the suction port of the compressor 1, and the fourth valve port C1 and the fifth valve port C2 are respectively used to connect with the outdoor heat exchange pipeline.

[0052] The sixth valve port D is located on the valve body 21 and is used to communicate with the exhaust port of the compressor 1;

[0053] When the slide valve 23 slides to the first position, the first valve port E1 is connected to the sixth valve port D, the second valve port E2 is blocked by the slide valve 23, and the third valve port S, the fourth valve port C1 and the fifth valve port C2 are connected to each other.

[0054] When the slide valve 23 slides to the second position, the first valve port E1 is connected to the fifth valve port C2, the fourth valve port C1 is blocked by the slide valve 23, and the first valve port E1, the second valve port E2 and the third valve port S are connected to each other.

[0055] Specifically, compared to the traditional four-way valve structure, the addition of a first or second valve port and a fourth or fifth valve port increases the number of refrigerant flow paths on the evaporator side, regardless of whether it is in cooling or heating mode. Compared to the conventional evaporator side, this increases the refrigerant flow velocity in the flow path, reduces pressure loss during refrigerant flow, and improves heat exchange efficiency. Furthermore, the first valve port E1 and the fifth valve port C2 are located on the outside of multiple valve ports, facilitating the connection between the sixth valve port D and the first valve port E1 or the fifth valve port C2, thereby enabling the switching of operating modes. This also prevents cross-flow between the six-way reversing valve 2 and the inner first valve port E1, second valve port E2, third valve port S, or third valve port S, fourth valve port C1, and fifth valve port C2, thus improving the operational stability of the six-way reversing valve 2.

[0056] Furthermore, when slide valve 23 slides to the first position (heating mode), slide valve 2 blocks the second valve port E2. When the second valve port E2 connects to two indoor subcooling pipes (indoor heat exchange pipes), the refrigerant cannot enter the second valve port E2, but can only flow along the two indoor subcooling pipes, changing the flow direction of the refrigerant and allowing it to be subcooled again, which is beneficial to improving heating capacity and heating efficiency. When slide valve 23 slides to the second position (cooling mode), slide valve 2 blocks the fourth valve port C1. When the second valve port E2 connects to two outdoor subcooling pipes, the refrigerant cannot enter the fourth valve port C1, but can only flow along the two outdoor subcooling pipes, changing the flow direction of the refrigerant and allowing it to be subcooled again, thus improving the cooling effect.

[0057] In a preferred embodiment of the present invention, the sixth valve port D and any one of the second valve port E2, the third valve port S, the fourth valve port C1, and the fifth valve port C2 are respectively located on opposite sides of the valve body 21. Preferably, the sixth valve port D is located at the top of the valve body 21, and any one of the second valve port E2, the third valve port S, the fourth valve port C1, and the fifth valve port C2 is located at the bottom of the valve body 21, defining the thickness or height of the valve body 21 between the top and the bottom. This embodiment, by optimizing the arrangement of the sixth valve port D and the second valve port E2, the third valve port S, the fourth valve port C1, and the fifth valve port C2 on the valve body 21, facilitates mode switching and valve port blocking via the movement of the slide valve 23, allowing the refrigerant from the compressor 1 outlet to smoothly enter through the first valve port E1 or the fifth valve port C2 and return to the compressor 1 through the third valve port S.

[0058] In a preferred embodiment of the present invention, the slide valve 23 includes a first connecting section 231, a second connecting section 232, and a third connecting section 233 connected in sequence, wherein,

[0059] When the slide valve 23 slides to the first position, the first connecting section 231 is used to block the second valve port E2; when the slide valve 23 slides to the second position, the third connecting section 233 is used to block the fourth valve port C1.

[0060] The second connecting section 232 protrudes to one side to form a connecting cavity 234 that connects the other three valve ports that are not blocked by the slide valve 23 and are not connected to the sixth valve port D. The connecting cavity 234 is isolated from the valve cavity 22. Specifically, it protrudes to the top side of the valve body 21 or to the side away from the first valve port E1 to the fifth valve port C2, so that the lower valve port and the second connecting section 232 form a connecting cavity 234, realizing the mutual communication between the three valve ports (in the cooling mode, the connecting cavity 234 is connected to the first valve port E1, the second valve port E2, and the third valve port S; in the heating mode, the connecting cavity 234 is connected to the third valve port S, the fourth valve port C1, and the fifth valve port C2).

[0061] By isolating the connecting cavity 234 from the valve cavity 22, it is possible to prevent the refrigerant from the compressor 1 outlet from entering the connecting cavity 234. This prevents the refrigerant from the compressor 1 outlet from entering the outdoor heat exchanger group 6 first in heating mode, and prevents the refrigerant from the compressor 1 outlet from entering the indoor heat exchanger group 3 first in cooling mode, ensuring a normal refrigerant flow path in both cooling and heating modes and guaranteeing the cooling and heating effects. The slide valve structure in this design is matched with the first to fifth valve ports C2, enabling mode switching, increasing the number of flow paths, and changing the refrigerant flow direction, making it highly practical. It should be noted that the directional arrows between the sixth valve port D and the first valve port E or between the sixth valve port D and the fifth valve port C2 in the diagram only represent the connection relationship and do not represent the physical structure.

[0062] In a preferred embodiment of the present invention, the distance between the first valve port E1 and the side wall of the corresponding valve cavity 22 is not less than the length of the first connecting section 231; specifically, the lateral distance between the first valve port E1 and the left side wall of the valve cavity 22 is not less than the length of the first connecting section 231, where the length refers to the length of the first connecting section 231 in the extending direction. When the slide valve 23 moves to the second position, the third connecting section 233 blocks the fourth valve port C1, and the first connecting section 231 extends between the first valve port E1 and the side wall of the corresponding valve cavity 22. The distance between the first valve port E1 and the side wall of the valve cavity 22 is not less than the length of the first connecting section 231, which can prevent interference between the first connecting section 231 of the slide valve 23 and the side wall of the corresponding valve cavity 22, thus preventing the stability of the position of the slide valve 23 and preventing refrigerant leakage from the valve port.

[0063] In a preferred embodiment of the present invention, the distance between the fifth valve port C2 and the side wall of the corresponding valve cavity 22 is not less than the length of the third connecting section 233. Specifically, the lateral distance between the fifth valve port C2 and the right side wall of the valve cavity 22 is not less than the length of the third connecting section 231, where length refers to the length of the third connecting section 231 in the extending direction. When the slide valve 23 moves to the first position, the first connecting section 231 blocks the second valve port E2, and the third connecting section 233 extends between the fifth valve port C2 and the side wall of the corresponding valve cavity 22. The distance between the fifth valve port C2 and the side wall of the valve cavity 22 is not less than the length of the third connecting section 233, which can prevent interference between the third connecting section 233 of the slide valve 23 and the side wall of the corresponding valve cavity 22, thus preventing the stability of the position of the slide valve 23 and preventing refrigerant leakage from the valve port.

[0064] [First Implementation Method]

[0065] Another aspect of the present invention provides an air conditioning system, including the aforementioned six-way reversing valve 2.

[0066] Specifically, such as Figure 2 , Figure 3 As shown, in a preferred embodiment of the present invention, the air conditioning system further includes:

[0067] The compressor 1 has its discharge end connected to the sixth valve port D of the six-way reversing valve 2, and its suction end connected to the third valve port S of the six-way reversing valve 2.

[0068] Indoor heat exchanger group 3, the first end is connected to the third valve port S;

[0069] The first chamber subcooling pipe 41 has its first end connected to the second valve port E2;

[0070] The second indoor subcooling pipe 42 has its first end connected to the second valve port E2; the second end of the indoor heat exchanger assembly 3 is connected to the second end of the first indoor subcooling pipe 41 and the second end of the second indoor subcooling pipe 42; in this embodiment, the indoor heat exchanger assembly 3, the first indoor subcooling pipe 41, and the second indoor subcooling pipe 42 all have a first end as an inlet or outlet and a second end as an outlet or inlet, and the inlet or outlet end can be determined according to the arrow direction in the cooling or heating mode.

[0071] The first outdoor subcooling pipe 51 has its first end connected to the fourth valve port C1;

[0072] The second outdoor subcooling pipe 52 has its first end connected to the fourth valve port C1;

[0073] The outdoor heat exchanger assembly 6 has its first end connected to the fifth valve port C2. The second end of the outdoor heat exchanger assembly 6, the second end of the first outdoor subcooling pipe 51, and the second end of the second outdoor subcooling pipe 52 are all connected together. The outdoor heat exchanger assembly 6, the first outdoor subcooling pipe 51, and the second outdoor subcooling pipe 52 each have a first end that serves as an inlet or outlet and a second end that serves as an outlet or inlet. The inlet or outlet end can be determined according to the arrow direction in the cooling or heating mode.

[0074] Throttling valve 7 is located between the second end of the second indoor subcooling pipe 42 and the second end of the first outdoor subcooling pipe 51;

[0075] The first one-way valve 81 is located between the second end of the first indoor subcooling pipe 41 and the second end of the second indoor subcooling pipe 42. The first one-way valve 81 is closed in heating mode and open in cooling mode.

[0076] The second one-way valve 82 is located between the second end of the first outdoor subcooling pipe 51 and the second end of the second outdoor subcooling pipe 52. The second one-way valve 82 is open in heating mode and closed in cooling mode.

[0077] In the above manner, in either cooling or heating mode, the refrigerant at the outlet of the expansion valve 7 is divided into four branches and returns to the compressor 1, increasing the number of evaporator-side flow paths, increasing the refrigerant flow rate, and reducing pressure loss, which is beneficial to improving the cooling effect. The refrigerant before the expansion valve 7 or at the outlet of the compressor 1 flows through the indoor heat exchanger group 3 and then through two indoor subcooling pipes, or through the outdoor heat exchanger group 6 and then through two outdoor subcooling pipes, so that the condensed refrigerant is condensed again through the indoor or outdoor subcooling pipes, thereby improving the heating or cooling effect.

[0078] Correspondingly, based on the above-described air conditioning system, this embodiment also provides a control method for an air conditioning system, comprising the following steps:

[0079] like Figure 2As shown, in heating mode, the control slide valve 23 slides to the first position, the sixth valve port D is connected to the first valve port E1, the second valve port E2 is blocked, the third valve port S, the fourth valve port C1, and the fifth valve port C2 are connected to each other, the first one-way valve 81 is closed, and the second one-way valve 82 is open; the refrigerant from the compressor 1 outlet passes through the first valve port E1, the indoor heat exchanger group 3, the first indoor subcooling pipe 41, the second indoor subcooling pipe 42, and the throttle valve 7 in sequence, and then splits into four branches to return to the compressor 1;

[0080] like Figure 3 As shown, in the cooling mode, the control slide valve 23 slides to the second position, the fourth valve port C1 is blocked, the first valve port E1, the second valve port E2 and the third valve port S are connected to each other, the first check valve 81 is open, and the second check valve 82 is closed; the refrigerant from the compressor 1 outlet passes through the fifth valve port C2, the outdoor heat exchanger group 6, the second outdoor subcooling pipe 52, the first outdoor subcooling pipe 51 and the throttle valve 7 in sequence and then splits into four branches to return to the compressor 1.

[0081] [Second Implementation Method]

[0082] like Figure 4 , Figure 5 As shown, the second embodiment of the present invention provides an air conditioning system, which has a structure that is basically the same as that of the air conditioning system in the first embodiment. The difference is that in the second embodiment, the indoor heat exchanger group 3 includes multiple groups of indoor heat exchangers connected in parallel; the outdoor heat exchanger group 6 includes multiple groups of outdoor heat exchangers connected in parallel; specifically, the indoor heat exchanger group 3 includes a first indoor heat exchanger 31 and a second indoor heat exchanger 32, and the outdoor heat exchanger group 6 includes a first outdoor heat exchanger 61 and a second heat exchanger 62.

[0083] The number of heat exchangers in indoor heat exchanger group 3 or outdoor heat exchanger group 6 can be adjusted according to actual needs through the above method; by setting multiple groups of indoor or outdoor heat exchangers in parallel, the refrigerant flow path on the evaporator side can be increased during cooling or heating, thereby improving the refrigerant flow rate and heat exchange effect.

[0084] In some implementations, the number of indoor or outdoor subcooling pipes can be adjusted as needed to achieve the desired subcooling effect. This implementation does not limit the number of indoor or outdoor subcooling pipes.

[0085] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that, include: A six-way directional control valve, the six-way directional control valve comprising: Valve body, the interior of which forms a valve cavity; A slide valve, which is slidably disposed within the valve cavity; The first valve port, the second valve port, the third valve port, the fourth valve port, and the fifth valve port are sequentially provided on the valve body. The first valve port and the second valve port are respectively used to connect with the indoor heat exchange pipeline, the third valve port is used to connect with the suction port of the compressor, and the fourth valve port and the fifth valve port are respectively used to connect with the outdoor heat exchange pipeline. The sixth valve port is located on the valve body and is used to communicate with the exhaust port of the compressor; When the slide valve slides to the first position, the first valve port is connected to the sixth valve port, the second valve port is blocked by the slide valve, and the third valve port, the fourth valve port and the fifth valve port are connected to each other; When the slide valve slides to the second position, the sixth valve port is connected to the fifth valve port, the fourth valve port is blocked by the slide valve, and the first valve port, the second valve port and the third valve port are connected to each other; Also includes: The compressor has its discharge end connected to the sixth valve port of the six-way reversing valve, and its suction end connected to the third valve port of the six-way reversing valve. The indoor heat exchanger assembly has its first end connected to the first valve port; The first chamber subcooling pipe has its first end connected to the second valve port; The second indoor subcooling pipe has its first end connected to the second valve port; the second end of the indoor heat exchanger assembly is connected to the second end of the first indoor subcooling pipe and the second end of the second indoor subcooling pipe. The first outdoor subcooling pipe has its first end connected to the fourth valve port; The second outdoor subcooling pipe has its first end connected to the fourth valve port; The outdoor heat exchanger assembly has its first end connected to the fifth valve port, and its second end, the second end of the first outdoor subcooling pipe, and the second end of the second outdoor subcooling pipe are all connected together. A throttle valve is located between the second end of the second indoor subcooling pipe and the second end of the first outdoor subcooling pipe; A first one-way valve is located between the second end of the first indoor subcooling pipe and the second end of the second indoor subcooling pipe. The first one-way valve is closed in heating mode and open in cooling mode. The second one-way valve is located between the second end of the first outdoor subcooling pipe and the second end of the second outdoor subcooling pipe. The second one-way valve is open in heating mode and closed in cooling mode.

2. The air conditioning system according to claim 1, characterized in that, The slide valve includes a first connecting section, a second connecting section, and a third connecting section connected in sequence, wherein, When the slide valve slides to the first position, the first connecting section is used to block the second valve port; when the slide valve slides to the second position, the third connecting section is used to block the fourth valve port. The second connecting section protrudes to one side to form a connecting cavity that connects the other three valve ports that are not blocked by the slide valve and are not connected to the sixth valve port. The connecting cavity is isolated from the valve cavity.

3. The air conditioning system according to claim 2, characterized in that, The distance between the first valve port and the side wall of the valve cavity is not less than the length of the first connecting section.

4. The air conditioning system according to claim 2, characterized in that, The distance between the fifth valve port and the side wall of the valve cavity is not less than the length of the third connecting section.

5. The air conditioning system according to any one of claims 1 to 4, characterized in that, The sixth valve port and any one of the second, third, fourth and fifth valve ports are located on opposite sides of the valve body.

6. The air conditioning system according to claim 1, characterized in that, The indoor heat exchanger group includes one set of indoor heat exchangers or multiple sets of indoor heat exchangers connected in parallel; the outdoor heat exchanger group includes one set of outdoor heat exchangers or multiple sets of outdoor heat exchangers connected in parallel.

7. A control method for an air conditioning system as described in any one of claims 1 to 6, characterized in that, Includes the following steps: In heating mode, the slide valve is controlled to slide to the first position, the sixth valve port is connected to the first valve port, the second valve port is blocked, and the third valve port, the fourth valve port, and the fifth valve port are connected to each other; the refrigerant from the compressor outlet passes sequentially through the first valve port, the indoor heat exchanger group, the first indoor subcooling pipe, the second indoor subcooling pipe, and the throttling valve, and then splits into four branches to return to the compressor. In cooling mode, the slide valve is controlled to slide to the second position, the fourth valve port is blocked, and the first valve port, the second valve port and the third valve port are interconnected; the refrigerant from the compressor outlet passes through the fifth valve port, the outdoor heat exchanger group, the second outdoor subcooling pipe, the first outdoor subcooling pipe and the throttling valve in sequence, and then splits into four branches to return to the compressor.

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