Air conditioning system and control method

Abstract

The invention relates to the technical field of air conditioners, and provides an air conditioning system and a control method.The air conditioning system comprises an outdoor heat exchanger, an indoor heat exchanger, a bidirectional drying filter, a refrigeration expansion valve, a heating expansion valve, a first electromagnetic valve and a second electromagnetic valve, and the indoor heat exchanger is connected with the outdoor heat exchanger through a refrigerant main path; the bidirectional drying filter is arranged in the refrigerant main path; the refrigeration expansion valve and the heating expansion valve are arranged in the refrigerant main path and located at the two ends of the two-way drying filter. The first electromagnetic valve is connected in parallel with the refrigeration expansion valve; the second electromagnetic valve is connected to the heating expansion valve in parallel. The pipeline structure of the system can be effectively simplified, the manufacturing cost is reduced, the refrigerant leakage phenomenon is reduced, the control precision of the system mode is improved, and the heat exchange performance of the system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioning system and a control method thereof. Background Art

[0002] Existing air-cooled heat pump air conditioning systems generally use one-way drying filters. Usually, the one-way drying filters are arranged at the outlet of the condenser. The liquid refrigerant from the condenser enters from the inlet end of the one-way drying filter and flows out from the outlet end to complete the filtering and adsorption functions.

[0003] However, the air conditioning system needs to enter from the same inlet end of the one-way drying filter and flow out from the same outlet end in both the cooling mode and the heating mode, resulting in a relatively complex pipeline layout of the air conditioning system, a longer pipeline, a large number of components, an increase in refrigerant pressure drop, a decrease in control accuracy, thus leading to a reduction in system performance, and prone to refrigerant leakage problems, and a relatively high manufacturing cost. Summary of the Invention

[0004] The present invention provides an air conditioning system and a control method thereof, which can effectively simplify the pipeline structure of the system, reduce the manufacturing cost, reduce the refrigerant leakage phenomenon, and improve the control accuracy of the system mode to ensure the heat exchange performance of the system.

[0005] The present invention provides an air conditioning system, comprising:

[0006] An outdoor heat exchanger;

[0007] An indoor heat exchanger, connected to the outdoor heat exchanger via a main refrigerant pipeline;

[0008] A two-way drying filter, arranged in the main refrigerant pipeline;

[0009] A refrigeration expansion valve and a heating expansion valve, arranged in the main refrigerant pipeline and located at both ends of the two-way drying filter;

[0010] A first solenoid valve, connected in parallel with the refrigeration expansion valve;

[0011] A second solenoid valve, connected in parallel with the heating expansion valve;

[0012] In the cooling mode, the refrigerant of the air conditioning system flows through the outdoor heat exchanger, the second solenoid valve, the two-way drying filter, and the refrigeration expansion valve to the indoor heat exchanger;

[0013] In the heating mode, the refrigerant of the air conditioning system flows through the indoor heat exchanger, the first solenoid valve, the two-way drying filter, and the heating expansion valve to the outdoor heat exchanger.

[0014] According to an air conditioning system provided by the present invention, it further comprises:

[0015] The first refrigerant branch is connected in parallel to the refrigeration expansion valve, and the first solenoid valve is arranged in the first refrigerant branch;

[0016] The second refrigerant branch is connected in parallel to the heating expansion valve, and the second solenoid valve is arranged in the second refrigerant branch.

[0017] In an air-conditioning system provided by the present invention, a first stop valve is arranged between the two-way drying filter and the refrigeration expansion valve, and a second stop valve is arranged between the two-way drying filter and the heating expansion valve.

[0018] An air-conditioning system provided by the present invention further includes:

[0019] A compressor;

[0020] A four-way valve, the first valve port of the four-way valve is connected to the exhaust port of the compressor, the second valve port of the four-way valve is connected to the outdoor heat exchanger, the third valve port of the four-way valve is connected to the indoor heat exchanger, and the fourth valve port of the four-way valve is connected to the suction port of the compressor.

[0021] In an air-conditioning system provided by the present invention, the fourth valve port of the four-way valve is connected to the suction port of the compressor through a gas-liquid separator.

[0022] In an air-conditioning system provided by the present invention, the indoor heat exchanger is connected to the main refrigerant circuit through a liquid receiver.

[0023] In an air-conditioning system provided by the present invention, the two-way drying filter includes:

[0024] A drying filter body having a first end and a second end;

[0025] A conduction unit is arranged at the first end and the second end. The conduction unit has a first port and a second port at a position corresponding to the first end, and a third port and a fourth port at a position corresponding to the second end. Filter elements are respectively arranged at positions corresponding to the second port and the fourth port;

[0026] Wherein, the refrigerant can flow in from the first port and flow out from the fourth port, or the refrigerant can flow in from the third port and flow out from the second port.

[0027] In an air-conditioning system provided by the present invention, the conduction unit includes two conduction components;

[0028] One of the conduction components is arranged at the first end, and the first port and the second port are arranged on one of the conduction components;

[0029] Another one of the conducting components is disposed at the second end, and the third port and the fourth port are disposed at the other conducting component.

[0030] The present invention further provides a control method for the above air-conditioning system, including:

[0031] Obtaining the operating mode of the air-conditioning system;

[0032] According to the operating mode of the air-conditioning system, controlling the opening and closing of the refrigeration expansion valve, the heating expansion valve, the first solenoid valve, and the second solenoid valve.

[0033] According to a control method for an air-conditioning system provided by the present invention, the step of controlling the opening and closing of the refrigeration expansion valve, the heating expansion valve, the first solenoid valve, and the second solenoid valve according to the operating mode of the air-conditioning system includes:

[0034] Determining that the air-conditioning system runs to the refrigeration mode, controlling the refrigeration expansion valve and the second solenoid valve to open, and the heating expansion valve and the first solenoid valve to close;

[0035] Determining that the air-conditioning system runs to the heating mode, controlling the heating expansion valve and the first solenoid valve to open, and the refrigeration expansion valve and the second solenoid valve to close.

[0036] The air-conditioning system and the control method provided by the present invention, by adopting a two-way drying filter, the air-conditioning system can realize refrigeration and heating operations with only one main refrigerant pipeline, that is, the refrigerant can flow bidirectionally on this pipeline, and by setting a refrigeration expansion valve and a parallel first solenoid valve, a heating expansion valve and a parallel second solenoid valve, the system can operate independently with the corresponding expansion valve in different operating modes, making the system regulation and control more accurate, thereby improving the heat exchange effect of the system in different modes. Therefore, the present invention can effectively simplify the pipeline structure of the system, reduce the manufacturing cost, reduce the refrigerant leakage phenomenon, and improve the control accuracy of the system mode, ensuring the heat exchange performance of the system. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following descriptions are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 is a schematic structural diagram of the air-conditioning system provided by the present invention;

[0039] Figure 2 is a three-dimensional schematic diagram of the two-way drying filter provided by the present invention;

[0040] Figure 3 is an exploded view of the two-way drying filter provided by the present invention;

[0041] Figure 4 is a three-dimensional schematic view of the first conduction component provided by the present invention;

[0042] Figure 5 is an exploded view of the first conduction component provided by the present invention;

[0043] Figure 6 is a three-dimensional schematic view of the second conduction component provided by the present invention;

[0044] Figure 7 is an exploded view of the second conduction component provided by the present invention;

[0045] Figure 8 is a schematic flow chart of the control method of the air conditioning system provided by the present invention.

[0046] Reference numerals:

[0047] 1. Outdoor heat exchanger; 2. Indoor heat exchanger;

[0048] 3. Two-way drying filter; 31. Drying filter body; 311. Housing body;

[0049] 3110. First refrigerant inlet and outlet hole; 312. Filter element component; 313. First end;

[0050] 314. Second end; 32. Conduction unit; 321. First conduction component;

[0051] 3211. First support; 3212. First conduction piece; 3221. First mounting bracket;

[0052] 322a. First port; 322b. Second port; 3222. First guide rod;

[0053] 3223. Second guide rod; 3224. First valve piece; 3225. Second valve piece;

[0054] 3213. First filter piece; 322. Second conduction component; 3231. Second support;

[0055] 3232. Second conduction piece; 3233. Second mounting bracket; 323a. Third port;

[0056] 323b. Fourth port; 3234. Third guide rod; 3235. Fourth guide rod;

[0057] 3236. Third valve piece; 3237. Fourth valve piece; 3238. Second filter piece;

[0058] 33. Flange; 34. Cover plate; 35. Head; 351. Second refrigerant inlet and outlet hole;

[0059] 36. First refrigerant inlet and outlet pipe; 37. Second refrigerant inlet and outlet pipe;

[0060] O. Axial direction of the main body of the dryer filter;

[0061] 4. Refrigeration expansion valve; 5. Heating expansion valve; 6. First solenoid valve;

[0062] 7. Second solenoid valve; 8. Main refrigerant path; 9. First refrigerant branch;

[0063] 10. Second refrigerant branch; 11. First stop valve; 12. Second stop valve;

[0064] 13. Compressor; 14. Four-way valve; 15. Gas-liquid separator; 16. Liquid receiver. Detailed implementation manners

[0065] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0066] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0067] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0068] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0069] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0070] The following will be combined with Figures 1 - 8 to describe the air conditioning system and control method of the present invention.

[0071] According to an embodiment of the first aspect of the present invention, as shown in reference to Figure 1 the air conditioning system provided by the present invention mainly includes: an outdoor heat exchanger 1, an indoor heat exchanger 2, a two-way dryer filter 3, a refrigeration expansion valve 4, a heating expansion valve 5, a first solenoid valve 6, and a second solenoid valve 7.

[0072] Among them, the outdoor heat exchanger 1 can be a plurality of parallel finned tube heat exchangers, and each finned tube heat exchanger is correspondingly provided with an outdoor fan to improve the heat exchange effect of the outdoor heat exchanger 1; the indoor heat exchanger 2 can be a dry heat exchanger, and the indoor heat exchanger 2 is connected to the outdoor heat exchanger 1 through a refrigerant main path 8; the two-way dryer filter 3 is arranged in the refrigerant main path 8, and the refrigerant of the air conditioning system can flow bidirectionally in the two-way dryer filter 3 for drying and filtering to realize the refrigeration and heating operation of the system; the refrigeration expansion valve 4 and the heating expansion valve 5 are arranged in the refrigerant main path 8 and are located at both ends of the two-way dryer filter 3; the first solenoid valve 6 is connected in parallel with the refrigeration expansion valve 4; the second solenoid valve 7 is connected in parallel with the heating expansion valve 5.

[0073] In the refrigeration mode, the refrigerant of the air-conditioning system flows through the outdoor heat exchanger 1, the second solenoid valve 7, the bi-directional drying filter 3, and the refrigeration expansion valve 4 to the indoor heat exchanger 2. That is, when the system operates in the refrigeration condition, the refrigerant does not pass through the heating expansion valve 5; in the heating mode, the refrigerant of the air-conditioning system flows through the indoor heat exchanger 2, the first solenoid valve 6, the bi-directional drying filter 3, and the heating expansion valve 5 to the outdoor heat exchanger 1. That is, when the system operates in the heating condition, the refrigerant does not pass through the refrigeration expansion valve 4.

[0074] The air-conditioning system provided by the embodiment of the present invention, by adopting the bi-directional drying filter 3, the air-conditioning system can realize refrigeration and heating operations with only one main refrigerant path 8, that is, the refrigerant can flow bidirectionally in this pipeline. And by setting the refrigeration expansion valve 4 and the parallel-connected first solenoid valve 6, the heating expansion valve 5 and the parallel-connected second solenoid valve 7, the system can operate independently with the corresponding expansion valve in different operating modes, making the system regulation and control more precise, thereby improving the heat exchange effect of the system in different modes. Therefore, the present invention can effectively simplify the pipeline structure of the system, reduce the manufacturing cost, reduce the refrigerant leakage phenomenon, and improve the control accuracy of the system mode, ensuring the heat exchange performance of the system.

[0075] According to an embodiment of the present invention, referring to Figure 1 As shown, the air-conditioning system of the present invention further includes: a first refrigerant branch 9 and a second refrigerant branch 10. The first refrigerant branch 9 is connected in parallel to the refrigeration expansion valve 4, and the first solenoid valve 6 is arranged in the first refrigerant branch 9 for controlling the on-off of the first refrigerant branch 9; the second refrigerant branch 10 is connected in parallel to the heating expansion valve 5, and the second solenoid valve 7 is arranged in the second refrigerant branch 10 for controlling the on-off of the second refrigerant branch 10.

[0076] Specifically, in the refrigeration mode, the refrigeration expansion valve 4 and the second solenoid valve 7 are opened, and the heating expansion valve 5 and the first solenoid valve 6 are closed. The refrigerant of the air-conditioning system flows through the outdoor heat exchanger 1, the second refrigerant branch 10, the bi-directional drying filter 3, and the refrigeration expansion valve 4 to the indoor heat exchanger 2.

[0077] In the heating mode, the heating expansion valve 5 and the first solenoid valve 6 are opened, and the refrigeration expansion valve 4 and the second solenoid valve 7 are closed. The refrigerant of the air-conditioning system flows through the indoor heat exchanger 2, the first refrigerant branch 9, the bi-directional drying filter 3, and the heating expansion valve 5 to the outdoor heat exchanger 1.

[0078] The embodiment of the present invention can ensure that the system operates independently with the corresponding expansion valve in the refrigeration mode and the heating mode respectively by connecting two solenoid valves in parallel on the two expansion valves, avoiding using the same expansion valve in different modes, making the system regulation and control more precise, thereby improving the heat exchange effect of the system in different modes.

[0079] The specific types of the refrigeration expansion valve 4 and the heating expansion valve 5 of the present invention are not particularly limited. For example, they can be thermostatic expansion valves.

[0080] According to an embodiment of the present invention, referring to Figure 1 As shown, a first stop valve 11 is provided between the two-way dryer filter 3 and the refrigeration expansion valve 4 to control the on / off of the flow path between the two-way dryer filter 3 and the refrigeration expansion valve 4; a second stop valve 12 is provided between the two-way dryer filter 3 and the heating expansion valve 5 to control the on / off of the flow path between the two-way dryer filter 3 and the heating expansion valve 5, so as to avoid refrigerant leakage when replacing the filter element component 312 of the two-way dryer filter 3.

[0081] When it is necessary to replace the filter element component 312 of the two-way dryer filter 3, the first stop valve 11 and the second stop valve 12 can be closed at this time. After truncating the refrigerant flow path, the user can remove and replace the filter element component 312 of the two-way dryer filter 3. After the replacement of the filter element component 312 is completed, the first stop valve 11 and the second stop valve 12 are opened again to conduct the refrigerant flow path.

[0082] The specific types of the first stop valve 11 and the second stop valve 12 of the present invention are not particularly limited. For example, they can be ball valves.

[0083] According to an embodiment of the present invention, referring to Figure 1 As shown, the air-conditioning system of the present invention further includes: a compressor 13 and a four-way valve 14. The first valve port of the four-way valve 14 is connected to the exhaust port of the compressor 13, the second valve port of the four-way valve 14 is connected to the outdoor heat exchanger 1, the third valve port of the four-way valve 14 is connected to the indoor heat exchanger 2, and the fourth valve port of the four-way valve 14 is connected to the suction port of the compressor 13. The four-way valve 14 is used to switch the operating mode of the air-conditioning system.

[0084] When the air-conditioning system operates in the refrigeration mode, the high-temperature and high-pressure refrigerant generated by the compressor 13 flows through the first valve port and the second valve port of the four-way valve 14 to the outdoor heat exchanger 1 for condensation and heat release. The condensed refrigerant flows through the second solenoid valve 7 to the two-way dryer filter 3 for drying and filtering, and then flows through the refrigeration expansion valve 4 for throttling and then to the indoor heat exchanger 2 for evaporation and heat absorption, and then returns to the compressor 13 through the third valve port and the fourth valve port of the four-way valve 14.

[0085] When the air-conditioning system operates in the heating mode, the high-temperature and high-pressure refrigerant generated by the compressor 13 flows through the first valve port and the third valve port of the four-way valve 14 to the indoor heat exchanger 2 for condensation and heat release. The condensed refrigerant flows through the first solenoid valve 6 to the two-way dryer filter 3 for drying and filtering, and then flows through the heating expansion valve 5 for throttling and then to the outdoor heat exchanger 1 for evaporation and heat absorption, and then returns to the compressor 13 through the second valve port and the fourth valve port of the four-way valve 14.

[0086] According to an embodiment of the present invention, referring toFigure 1 As shown, the fourth valve port of the four-way valve 14 is connected to the suction port of the compressor 13 via the gas-liquid separator 15. The gas-liquid separator 15 can achieve the separation of refrigerant gas and liquid, preventing excessive liquid refrigerant from entering the compressor 13, thereby reducing the liquid hammer phenomenon and achieving the purpose of protecting the compressor 13.

[0087] Moreover, the indoor heat exchanger 2 is connected to the main refrigerant circuit 8 via the liquid receiver 16.

[0088] Next, Figures 2 to 7 a further description will be given to the two-way drying filter 3 provided by the present invention.

[0089] According to an embodiment of the present invention, as Figures 2 to 7 shown, the two-way drying filter 3 may include: a drying filter main body 31 and a conduction unit 32. The drying filter main body 31 has a first end 313 and a second end 314; the conduction unit 32 is disposed at the first end 313 and the second end 314. The conduction unit 32 has a first port 322a and a second port 322b at a position corresponding to the first end 313, and the conduction unit 32 has a third port 323a and a fourth port 323b at a position corresponding to the second end 314. Filter elements are respectively provided at positions corresponding to the second port 322b and the fourth port 323b; wherein, the refrigerant can flow in from the first port 322a and flow out from the fourth port 323b, or, the refrigerant can flow in from the third port 323a and flow out from the second port 322b.

[0090] During specific implementation, the refrigerant can flow in from the first port 322a and flow out from the fourth port 323b, or, the refrigerant can flow in from the third port 323a and flow out from the second port 322b. That is to say, through the above structural arrangement, bidirectional flow (bidirectional conduction) can be achieved. Compared with the drying filter of the prior art that can only flow unidirectionally, the two-way drying filter of the present invention can enter from any one of the first end 313 and the second end 314, without the need to additionally provide multiple one-way valves and corresponding pipelines for connecting the drying filter, which can simplify the structure of the air conditioner, reduce the probability of refrigerant leakage, and reduce the cost of the air conditioner, so as to solve the technical problem that the structure of the air conditioner is complex due to the unidirectional flow of the drying filter of the prior art.

[0091] In addition, when the refrigerant flows out from the first end 313 or the second end 314 of the drying filter, it will be filtered by the filter element. That is to say, after the refrigerant flows out of the drying filter, the impurities in the refrigerant will be contained in the drying filter and will not be carried out. Therefore, the filtering ability of the drying filter can be improved, and it is not easy for impurities to enter the expansion valve and the compressor 13, causing blockage of the expansion valve and damage to the compressor 13, and improving the stability of the air conditioner.

[0092] According to an embodiment of the present invention, as Figures 2 to 7As shown, the first end 313 and the second end 314 may be the two ends of the axial direction O of the drying filter body 31, and the conduction unit 32 includes two conduction components, one of which is arranged at the first end 313, the first port 322a and the second port 322b are arranged at one of the conduction components, the other conduction component is arranged at the second end 314, and the third port 323a and the fourth port 323b are arranged at the other conduction component. The filter element may include a filter bracket and a filter screen arranged at the filter bracket.

[0093] According to one embodiment of the present invention, as Figures 2 to 7 As shown, the two conducting components are the first conducting component 321 and the second conducting component 322, and the two filtering components are the first filtering component 3213 and the second filtering component 3238; the first conducting component 321 includes the first supporting component 3211, the first conducting component 3212 and the first filtering component 3213, the first supporting component 3211 is arranged at the first end 313 and has a first channel, and the first channel runs through the two ends of the first supporting component 3211 arranged along the axial direction O of the drying filter body 31; the first conducting component 3212 is arranged at the end of the first supporting component 3211 away from the drying filter body 31, the first port 322a and the second port 322b are arranged on the first conducting component 3212, and the second port 322b can be connected to the first channel; the first filtering component 3213 covers the first channel.

[0094] During specific implementation, the first support member 3211 is used to provide an installation basis for the first conductive member 3212 and the first filter member 3213.

[0095] In this embodiment, the filter support of the first filter element 3213 can be inserted into the first channel, and the edge of the filter screen of the first filter element 3213 is connected to the inner wall of the filter support to cover the first channel.

[0096] According to one embodiment of the present invention, as Figure 4 and Figure 5As shown in the figure, the first conducting member 3212 may include a first mounting bracket 3221, a first guide rod 3222, a second guide rod 3223, a first valve plate 3224, and a second valve plate 3225; the first mounting bracket 3221 is disposed at one end of the first support member 3211 away from the drying filter body 31, and a first port 322a and a second port 322b are disposed on the first mounting bracket 3221; the first guide rod 3222 passes through the first mounting bracket 3221 and the first valve plate 3224 located at one end of the first mounting bracket 3221 away from the first support member 3211; the second guide rod 3223 passes through the first mounting bracket 3221 and the second valve plate 3225 located at one end of the first mounting bracket 3221 facing the first support member 3211; the first valve plate 3224 is slidably connected to the first guide rod 3222 and can cover the second port 322b when the refrigerant flows into the drying filter body 31 through the first port 322a; the second valve plate 3225 is slidably connected to the second guide rod 3223 and can cover the first port 322a when the refrigerant flows into the drying filter body 31 through the third port 323a.

[0097] During specific implementation, when the refrigerant flows into the drying filter body 31 from the outside through the first port 322a, it can push the first valve plate 3224 to slide on the first guide rod 3222, so that the first valve plate 3224 slides to abut against the end of the first mounting bracket 3221, covering the second port 322b. That is to say, the first valve plate 3224 can block the second port 322b. And when the refrigerant flows into the drying filter body 31 from the outside through the first port 322a, it can also push the second valve plate 3225 to slide on the second guide rod 3223, so that there is a gap between the first mounting bracket 3221 and the second valve plate 3225, enabling the refrigerant to flow into the drying filter body 31 from the outside through the first port 322a. Or, when the refrigerant flows into the drying filter body 31 from the outside through the third port 323a, it can push the first valve plate 3224 to slide on the first guide rod 3222, so that there is a gap between the first valve plate 3224 and the first mounting bracket 3221. That is to say, the second port 322b is exposed, enabling the refrigerant to flow out of the drying filter body 31 through the second port 322b. And when the refrigerant flows into the drying filter body 31 from the outside through the third port 323a, it can also push the second valve plate 3225 to slide on the second guide rod 3223, so that the second valve plate 3225 slides to abut against the end of the first mounting bracket 3221, covering the first port 322a. That is to say, the second valve plate 3225 can block the first port 322a. It realizes that the refrigerant flows in from the first port 322a and flows out from the fourth port 323b, or the refrigerant flows in from the third port 323a and flows out from the second port 322b.

[0098] As Figure 5As shown, in this embodiment, the first mounting bracket 3221 may be provided with six first ports 322a and three second ports 322b. The three second ports 322b are evenly spaced along the circumferential direction of the drying filter body 31. The six first ports 322a are evenly spaced along the circumferential direction of the drying filter body 31 and are arranged around the three second ports 322b. The first guide rod 3222 and the second guide rod 3223 may both be three. A plurality of first tongues may be provided at the edge of the second port 322b. The end of the first support member 3211 has a plurality of grooves that match the shape of the first tongues. The plurality of first tongues correspond to the plurality of grooves one by one, and the first tongues can be inserted into the grooves to connect the first mounting bracket 3221 and the first support member 3211.

[0099] According to an embodiment of the present invention, as Figure 6 and Figure 7 As shown, the second conduction member 322 includes a second support member 3231, a second conduction member 3232, and a second filter member 3238. The second support member 3231 is disposed at the second end 314 and has a second channel that penetrates through both ends of the second support member 3231 along the axial direction O of the drying filter body 31. The second conduction member 3232 is disposed at an end of the second support member 3231 away from the drying filter body 31. The third port 323a and the fourth port 323b are disposed on the second conduction member 3232, and the fourth port 323b can communicate with the second channel. The second filter member 3238 covers the second channel.

[0100] During specific implementation, the second support member 3231 is used to provide a mounting foundation for the second conduction member 3232 and the second filter member 3238.

[0101] In this embodiment, the filter bracket of the second filter member 3238 may be inserted into the second channel, and the edge of the filter screen of the second filter member 3238 is connected to the inner peripheral wall of the filter bracket to achieve coverage of the second channel.

[0102] According to an embodiment of the present invention, as Figure 6 and Figure 7As shown, the second conducting member 3232 includes a second mounting bracket 3233, a third guide rod 3234, a fourth guide rod 3235, a third valve plate 3236, and a fourth valve plate 3237; the second mounting bracket 3233 is disposed at one end of the second support member 3231 away from the drying filter body 31, and the third port 323a and the fourth port 323b are disposed on the second mounting bracket 3233; the third guide rod 3234 passes through the second mounting bracket 3233 and the third valve plate 3236 located at one end of the second mounting bracket 3233 away from the second support member 3231; the fourth guide rod 3235 passes through the second mounting bracket 3233 and the fourth valve plate 3237 located at one end of the second mounting bracket 3233 facing the second support member 3231; the third valve plate 3236 is slidably connected to the third guide rod 3234 and can cover the fourth port 323b when the refrigerant flows into the drying filter body 31 through the third port 323a; the fourth valve plate 3237 is slidably connected to the fourth guide rod 3235 and can cover the third port 323a when the refrigerant flows into the drying filter body 31 through the first port 322a.

[0103] During specific implementation, when the refrigerant flows into the drying filter body 31 from the outside through the third port 323a, it can push the third valve plate 3236 to slide on the third guide rod 3234, so that the third valve plate 3236 slides to abut against the end of the second mounting bracket 3233, covering the fourth port 323b. That is, the third valve plate 3236 can block the fourth port 323b. And when the refrigerant flows into the drying filter body 31 from the outside through the third port 323a, it can also push the fourth valve plate 3237 to slide on the fourth guide rod 3235, so that there is a gap between the second mounting bracket 3233 and the fourth valve plate 3237, enabling the refrigerant to flow into the drying filter body 31 from the outside through the third port 323a. When the refrigerant flows into the drying filter body 31 from the outside through the first port 322a, it can push the third valve plate 3236 to slide on the third guide rod 3234 from the inside to the outside, so that there is a gap between the third valve plate 3236 and the second mounting bracket 3233. That is, the fourth port 323b is exposed, enabling the refrigerant to flow out of the drying filter body 31 through the fourth port 323b. And when the refrigerant flows into the drying filter body 31 from the outside through the first port 322a, it can also push the fourth valve plate 3237 to slide on the fourth guide rod 3235, so that the fourth valve plate 3237 slides to abut against the end of the second mounting bracket 3233, covering the third port 323a. That is, the third valve plate 3236 can block the third port 323a. It realizes that the refrigerant flows in from the first port 322a and flows out from the fourth port 323b, or the refrigerant can flow in from the third port 323a and flow out from the second port 322b.

[0104] As Figure 7As shown, in this embodiment, the second mounting bracket 3233 may be provided with six third ports 323a and three fourth ports 323b. The three fourth ports 323b are evenly spaced along the circumferential direction of the drying filter main body 31. The six third ports 323a are evenly spaced along the circumferential direction of the drying filter main body 31 and are arranged around the three fourth ports 323b. The number of the third guide rods 3234 and the fourth guide rods 3235 may both be three.

[0105] According to an embodiment of the present invention, as Figure 3 shown, the drying filter main body 31 includes a housing main body 311 and a filter element component 312; the housing main body 311 extends along the axial direction O of the drying filter main body 31, and two conduction components are located inside the housing main body 311; the filter element component 312 is arranged inside the housing main body 311 and is clamped between the two conduction components.

[0106] Specifically, during implementation, the housing main body 311 is equivalent to a container that can accommodate the filter element component 312 and the two conduction components. The filter element component 312 can be an existing technology, which can dry the water flowing with the refrigerant and filter the impurities flowing with the refrigerant.

[0107] As Figure 3 shown, in this embodiment, the housing main body 311 may be columnar, configured as a hollow structure with openings at both ends. The filter element component 312 may include a plurality of (for example, five) holders and a plurality of (for example, four) filter cores. The plurality of holders are evenly spaced along the axial direction O of the drying filter main body 31. A filter core is clamped between two adjacent holders. Each holder has a first flanging for restricting the movement of the filter core. A gasket may be clamped between the holder and the filter core.

[0108] As Figure 3 shown, in some embodiments, the filter element component 312 may further include a fixing rod, which extends along the axial direction O of the drying filter main body 31 and is disposed through the middle positions of each holder and each filter core to fix the filter core and the holder. The fixing rod can be connected to the holder through fasteners (such as bolts and nuts).

[0109] As Figure 5As shown, in some embodiments, a stepped surface is provided in the first channel of the first support member 3211. A plurality of second tongues are provided at one end of the first support member 3211 facing the drying filter body 31. A plurality of second flanges corresponding to the second tongues one by one are provided on the filter element component 312 (cage). In a state where the first support member 3211 is located inside the housing main body 311, the filter element component 312 can extend into the housing main body 311 from the first opening. And in a state where the second flange is located in the first channel and abuts against the stepped surface, rotate a predetermined angle so that the second flange can abut against the second tongue to connect the first support member 3211 (conductive component) and the filter element component 312, facilitating the removal of the filter element component 312 and the conductive component together from the housing main body 311.

[0110] According to an embodiment of the present invention, as Figure 3 shown, the two-way drying filter 3 further includes a flange 33 and a cover plate 34; the housing main body 311 has a third end and a fourth end arranged along the axial direction O of the drying filter body 31. The outer peripheral wall of the housing main body 311 and at the fourth end further has a first refrigerant inlet and outlet hole 3110. The fourth end has a first opening. The flange 33 is disposed around the first opening. The cover plate 34 is located at the free end of the flange 33 and is detachably connected to the flange 33 for blocking the first opening.

[0111] During specific implementation, through the above structural arrangement, it is convenient to disassemble the filter element component 312 and the conductive component. When it is necessary to disassemble the filter element component 312 and the conductive component, the cover plate 34 can be removed from the flange 33, and then the filter element component 312 and the conductive component can be taken out from the drying filter body 31 through the first opening, facilitating the replacement of the filter element component 312.

[0112] In this embodiment, the flange 33 and the cover plate 34 can be connected by fasteners such as bolts.

[0113] According to an embodiment of the present invention, the two-way drying filter of the present invention may further include a sealing gasket, which is clamped between the flange 33 and the cover plate 34.

[0114] As Figure 3 shown, the two-way drying filter of the present invention may further include an elastic unit. The elastic unit can be a spring, which is located inside the housing main body 311 and is clamped between the second conductive component 322 and the cover plate 34.

[0115] During specific implementation, through the above structural arrangement, it can play an axial limiting role for the filter element component 312 and the conductive component inside the housing main body 311.

[0116] According to an embodiment of the present invention, as Figure 3As shown, the two-way drying filter 3 further includes a head 35. The third end has a second opening, and the head 35 covers the second opening. The head 35 is provided with a second refrigerant inlet and outlet hole 351.

[0117] According to an embodiment of the present invention, the two-way drying filter 3 further includes a first refrigerant inlet and outlet pipe 36 and a second refrigerant inlet and outlet pipe 37; the first refrigerant inlet and outlet pipe 36 passes through the second refrigerant inlet and outlet hole 351; the second refrigerant inlet and outlet pipe 37 passes through the first refrigerant inlet and outlet hole 3110.

[0118] During specific implementation, the refrigerant can enter the drying filter through the first refrigerant inlet and outlet pipe 36. After the refrigerant enters the drying filter, it can push the first valve plate 3224 to slide on the first guide rod 3222, so that the first valve plate 3224 slides to abut against the end of the first mounting bracket 3221, covering the middle second port 322b. That is, the first valve plate 3224 can block the second port 322b. And after the refrigerant enters the drying filter, it can also push the second valve plate 3225 to slide on the second guide rod 3223, so that there is a spacing between the first mounting bracket 3221 and the second valve plate 3225, so that the refrigerant can flow into the drying filter main body 31 through the first port 322a around the second port 322b. After the refrigerant enters the drying filter main body, it is dried and filtered by the filter element component 312. Then the refrigerant can push the fourth valve plate 3237 to slide on the fourth guide rod 3235, so that the fourth valve plate 3237 slides to abut against the end of the second mounting bracket 3233, covering the third port 323a. That is, the fourth valve plate 3237 can block the third port 323a. And the refrigerant can push the third valve plate 3236 to slide on the third guide rod 3234, so that there is a spacing between the third valve plate 3236 and the second mounting bracket 3233. That is, the fourth port 323b is exposed, so that the refrigerant can flow out from the second refrigerant inlet and outlet pipe 37 after being filtered by the second filter element 3238 through the fourth port 323b from the drying filter main body 31.

[0119] Alternatively, the refrigerant can enter the dryer filter through the second refrigerant inlet and outlet pipe 37. After the refrigerant enters the dryer filter, it can push the third valve plate 3236 to slide on the third guide rod 3234, causing the third valve plate 3236 to slide until it abuts against the end of the second mounting bracket 3233, covering the middle fourth port 323b. That is, the third valve plate 3236 can block the fourth port 323b. And after the refrigerant enters the dryer filter, it can also push the fourth valve plate 3237 to slide on the fourth guide rod 3235, creating a gap between the second mounting bracket 3233 and the fourth valve plate 3237, allowing the refrigerant to flow into the dryer filter body 31 through the third port 323a around the fourth port 323b. After the refrigerant enters the dryer filter body, it is dried and filtered by the filter element component 312. Then the refrigerant can push the second valve plate 3225 to slide on the second guide rod 3223, causing the second valve plate 3225 to slide until it abuts against the end of the first mounting bracket 3221, covering the first port 322a. That is, the second valve plate 3225 can block the first port 322a. And the refrigerant can push the first valve plate 3224 to slide on the first guide rod 3222, creating a gap between the first valve plate 3224 and the first mounting bracket 3221. That is, the second port 322b is exposed, allowing the refrigerant to flow out of the dryer filter body 31 through the first filter element 3213 and then through the second port 322b and out of the first refrigerant inlet and outlet pipe 36. This enables the refrigerant to flow in through the first port 322a and out through the fourth port 323b, or the refrigerant can flow in through the third port 323a and out through the second port 322b.

[0120] In a feasible embodiment, the end cap 35 can be welded to the third end.

[0121] In another feasible embodiment, the end cap 35 can be detachably connected to the third end through a clamp.

[0122] Next, the control method of the air conditioning system provided by the present invention will be further described. The control method of the air conditioning system described below can be correspondingly referred to the air conditioning system described above.

[0123] According to the embodiment of the second aspect of the present invention, referring to Figure 8 as shown, the present invention also provides a control method for the air conditioning system of the above embodiment, mainly including the following steps:

[0124] S100. Obtain the operating mode of the air conditioning system;

[0125] S200. According to the operating mode of the air conditioning system, control the opening and closing of the refrigeration expansion valve 4, the heating expansion valve 5, the first solenoid valve 6, and the second solenoid valve 7.

[0126] Specifically, when it is determined that the air-conditioning system operates in the cooling mode, the cooling expansion valve 4 and the second solenoid valve 7 are controlled to open, and the heating expansion valve 5 and the first solenoid valve 6 are controlled to close. The refrigerant of the air-conditioning system flows through the outdoor heat exchanger 1, the second solenoid valve 7, the bi-directional dryer filter 3, and the cooling expansion valve 4 to the indoor heat exchanger 2. That is, when the system operates in the cooling condition, the refrigerant does not pass through the heating expansion valve 5. When it is determined that the air-conditioning system operates in the heating mode, the heating expansion valve 5 and the first solenoid valve 6 are controlled to open, and the cooling expansion valve 4 and the second solenoid valve 7 are controlled to close. When in the heating mode, the refrigerant of the air-conditioning system flows through the indoor heat exchanger 2, the first solenoid valve 6, the bi-directional dryer filter 3, and the heating expansion valve 5 to the outdoor heat exchanger 1. That is, when the system operates in the heating condition, the refrigerant does not pass through the cooling expansion valve 4.

[0127] The control method of the air-conditioning system provided by the embodiment of the present invention can enable the system to independently operate with corresponding expansion valves in different operating modes, making the system regulation and control more accurate, thereby improving the heat exchange effect of the system in different modes and ensuring the heat exchange performance of the system.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning system, characterized in that: include: Outdoor heat exchanger; An indoor heat exchanger connected to the outdoor heat exchanger via a refrigerant main circuit; A bidirectional drying filter is arranged in the main refrigerant path; A cooling expansion valve and a heating expansion valve are arranged in the refrigerant main path and located at both ends of the bidirectional drying filter; A first solenoid valve, connected in parallel to the refrigeration expansion valve; a second solenoid valve connected in parallel to the heating expansion valve; In cooling mode, the refrigerant of the air conditioning system flows to the indoor heat exchanger through the outdoor heat exchanger, the second solenoid valve, the two-way filter drier, and the refrigeration expansion valve; In the heating mode, the refrigerant of the air-conditioning system flows to the outdoor heat exchanger through the indoor heat exchanger, the first solenoid valve, the two-way filter drier, and the heating expansion valve.

2. The air conditioning system according to claim 1, characterized in that: Also includes: A first refrigerant branch is connected in parallel to the refrigeration expansion valve, and the first solenoid valve is arranged in the first refrigerant branch; The second refrigerant branch is connected in parallel to the heating expansion valve, and the second solenoid valve is arranged in the second refrigerant branch.

3. The air conditioning system according to claim 1, characterized in that: A first stop valve is provided between the bidirectional filter drier and the refrigeration expansion valve, and a second stop valve is provided between the bidirectional filter drier and the heating expansion valve.

4. The air conditioning system according to claim 1, characterized in that: Also includes: compressor; A four-way valve, wherein a first valve port of the four-way valve is connected to the exhaust port of the compressor, a second valve port of the four-way valve is connected to the outdoor heat exchanger, a third valve port of the four-way valve is connected to the indoor heat exchanger, and a fourth valve port of the four-way valve is connected to the intake port of the compressor.

5. The air conditioning system according to claim 4, characterized in that: The fourth valve port of the four-way valve is connected to the air intake port of the compressor via a gas-liquid separator.

6. The air conditioning system according to claim 1, characterized in that: The indoor heat exchanger is connected to the refrigerant main circuit via a liquid storage device.

7. The air conditioning system according to any one of claims 1 to 6, characterized in that: The bidirectional filter drier comprises: a filter drier body having a first end and a second end; A conduction unit is provided at the first end and the second end, the conduction unit has a first port and a second port at a position corresponding to the first end, the conduction unit has a third port and a fourth port at a position corresponding to the second end, and filters are provided at positions corresponding to the second port and the fourth port respectively; The refrigerant can flow in from the first port and flow out from the fourth port, or the refrigerant can flow in from the third port and flow out from the second port.

8. The air conditioning system according to claim 7, characterized in that: The conduction unit includes two conduction components; One of the conducting components is disposed at the first end, and the first port and the second port are disposed at one of the conducting components; Another of the conducting components is disposed at the second end, and the third port and the fourth port are disposed at another of the conducting components.

9. A method for controlling an air conditioning system according to any one of claims 1 to 8, characterized in that: include: Get the operation mode of the air conditioning system; According to the operation mode of the air conditioning system, the opening and closing of the cooling expansion valve, the heating expansion valve, the first solenoid valve and the second solenoid valve are controlled.

10. The control method of the air conditioning system according to claim 9, characterized in that: The step of controlling the opening and closing of the cooling expansion valve, the heating expansion valve, the first solenoid valve and the second solenoid valve according to the operation mode of the air conditioning system comprises: Determining that the air conditioning system operates in a cooling mode, controlling the cooling expansion valve and the second solenoid valve to be opened, and the heating expansion valve and the first solenoid valve to be closed; It is determined that the air conditioning system operates in a heating mode, and the heating expansion valve and the first solenoid valve are controlled to be opened, and the cooling expansion valve and the second solenoid valve are controlled to be closed.

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