Air conditioning system and air conditioning control method

Abstract

The application provides an air conditioning system and an air conditioning control method, wherein the air conditioning system comprises an indoor unit and an outdoor unit; the outdoor unit is communicated with the indoor unit through a first pipeline and a second pipeline; the indoor unit comprises a bypass compression device, a first heat exchanger, a second heat exchanger and a third heat exchanger; the bypass compression device has a shutdown state and a working state; in the shutdown state, the other end of the second heat exchanger is directly communicated with one end of the first heat exchanger; in the working state, the bypass compression device compresses the medium flowing out from the other end of the second heat exchanger and delivers the medium into the first heat exchanger; wherein the air inlet of the indoor unit passes through the third heat exchanger, the second heat exchanger and the first heat exchanger in sequence to exchange heat and then blows out. The air conditioning system provided by the application solves the problem that the air outlet of the air conditioner is easy to float water under the condition that the indoor humidity is high, and solves the problem that the indoor unit has no obvious heat output to the indoor when the outdoor heat exchanger defrosts.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to an air conditioning system and an air conditioning control method. Background Technology

[0002] Currently, existing air conditioning systems have several drawbacks. Firstly, when operating in high humidity conditions, the mixing of the outlet and indoor air causes water to be carried into the air once the temperature drops below the dew point, severely impacting the user experience. Secondly, when defrosting ends, the extremely low refrigerant temperature in the indoor heat exchanger prevents the immediate activation of the indoor fan for heating, prolonging the defrosting cycle and failing to meet users' needs for rapid heating. Furthermore, existing air conditioners generally use electric auxiliary heating structures as auxiliary heating devices. These electrically powered structures not only affect the airflow path but also require additional grounding and anti-accidental contact devices, resulting in insufficient safety and increased structural complexity.

[0003] In summary, the existing air conditioning systems have the following problems: 1. Water is easily blown into the air outlet during high humidity cooling; 2. The electric auxiliary heating structure affects the air duct and poses a safety hazard; 3. During the defrosting process of the air conditioning system, heat cannot be output to the room in a timely manner, resulting in a poor user experience. Summary of the Invention

[0004] This invention provides an air conditioning system and an air conditioning control method to solve the problems in the prior art where air conditioning systems are prone to water droplets in the air outlet during high humidity cooling and cannot output heat in a timely manner during heating and defrosting.

[0005] To address the aforementioned problems, according to one aspect of the present invention, an air conditioning system is provided, comprising an indoor unit and an outdoor unit; the outdoor unit includes an outdoor heat exchanger and a first compressor; the outdoor unit and the indoor unit are connected via a first pipeline and a second pipeline to form a circulation pipeline; the indoor unit includes a bypass compressor, a first heat exchanger, a second heat exchanger, and a third heat exchanger; both ends of the third heat exchanger are respectively connected to the first pipeline and the second pipeline; one end of the second heat exchanger is connected to the first pipeline, and the other end of the second heat exchanger is connected to the bypass compressor, the bypass compressor is connected to one end of the first heat exchanger, and the other end of the first heat exchanger is connected to the second pipeline; the bypass compressor has a power-off state and a working state; in the power-off state, the other end of the second heat exchanger is directly connected to one end of the first heat exchanger; in the working state, the bypass compressor compresses the medium flowing out from the other end of the second heat exchanger and delivers it into the first heat exchanger; wherein, the air intake of the indoor unit passes through the third heat exchanger, the second heat exchanger, and the first heat exchanger in sequence for heat exchange before being blown out.

[0006] Furthermore, the air conditioning system also includes a first throttling device and a second throttling device for depressurizing and cooling the medium. One end of the second throttling device is connected to the first pipeline, and the other end of the second throttling device is connected to the third heat exchanger and one end of the first throttling device, respectively. The other end of the first throttling device is connected to the second heat exchanger.

[0007] Furthermore, the first throttling device is installed indoors, and the second throttling device is installed indoors or outdoors; the first and second throttling devices are valve-type devices with adjustable opening.

[0008] Furthermore, the second heat exchanger and the first heat exchanger are separate structures and are spaced apart; the second heat exchanger and the third heat exchanger are separate structures and are spaced apart; or, the second heat exchanger and the third heat exchanger are formed by separating an integral heat exchanger through internal piping.

[0009] Furthermore, the indoor unit also includes an indoor fan for driving airflow, which is disposed between the second heat exchanger and the first heat exchanger; the first heat exchanger is disposed at the air outlet of the indoor unit.

[0010] Furthermore, the heat exchange areas of the second and third heat exchangers are not less than the heat exchange area of ​​the first heat exchanger.

[0011] Furthermore, the bypass compression device includes a first solenoid valve and a second compressor; the two ends of the first solenoid valve are respectively connected to the other end of the second heat exchanger and one end of the first heat exchanger; the two ends of the second compressor are respectively connected to the other end of the second heat exchanger and one end of the first heat exchanger; wherein, in the off state, the second compressor is off, and the first solenoid valve is normally open to directly connect the other end of the second heat exchanger with one end of the first heat exchanger; in the working state, the first solenoid valve is normally closed, and the second compressor compresses the medium flowing out from the other end of the second heat exchanger and delivers it into the first heat exchanger.

[0012] Furthermore, the outdoor unit also includes a four-way valve, which has a first port, a second port, a third port, and a fourth port. The first port is connected to the second pipeline, the second port is connected to one end of the first compressor, the other end of the first compressor is connected to the fourth port, the third port is connected to one end of the outdoor heat exchanger, and the other end of the outdoor heat exchanger is connected to the second pipeline. The four-way valve has a first switching state and a second switching state. In the first switching state, the first port is connected to the second port, and the third port is connected to the fourth port. In the second switching state, the first port is connected to the fourth port, and the third port is connected to the second port.

[0013] According to another aspect of the present invention, an air conditioning control method is provided, applied to the aforementioned air conditioning system. The air conditioning control method includes at least one of the following modes: Conventional cooling mode: controlling the bypass compressor to be in a shut-off state, and controlling the first heat exchanger, second heat exchanger, and third heat exchanger to absorb heat to cool the room; Conventional heating mode: controlling the bypass compressor to be in a shut-off state, and controlling the first heat exchanger, second heat exchanger, and third heat exchanger to release heat to raise the room temperature; Auxiliary heating mode: controlling the bypass compressor to be in a working state, and controlling the second heat exchanger to absorb heat. In the cooling and dehumidification mode, the bypass compressor is activated, the second and third heat exchangers absorb heat, and the first heat exchanger releases heat, so that the indoor unit's outlet air temperature is higher than the dew point and the indoor temperature is lowered; moisture in the indoor air condenses on the second and / or third heat exchangers; in the heating and defrosting mode, the bypass compressor is activated, the second heat exchanger absorbs heat, and the first and third heat exchangers release heat, so as to defrost the outdoor heat exchanger in the outdoor unit and raise the indoor temperature.

[0014] Furthermore, the air conditioning control method is applied to the aforementioned air conditioning system. The conventional cooling mode includes: controlling the opening of the first throttling device to the maximum, and adjusting the second throttling device to a suitable opening; the medium flowing out of the outdoor unit enters the second throttling device through the first pipe, and the second throttling device reduces the pressure and temperature of the medium. Part of the medium enters the third heat exchanger to absorb heat, and the other part of the medium enters the second heat exchanger and the first heat exchanger in sequence through the first throttling device to absorb heat. Finally, the two parts of the medium merge and return to the outdoor unit through the second pipe, completing the cycle.

[0015] Furthermore, the conventional cooling mode also includes: controlling the first compressor in the outdoor unit to work, the medium compressed by the first compressor enters the outdoor heat exchanger to release heat, and then the medium enters the second throttling device from the first pipeline; acquiring the user-set temperature T1, the preset deviation parameter T2 and the indoor ambient temperature T3, and then comparing T1 with T3; if T3 > T1 + T2, then reducing the opening degree D2 of the second throttling device; if T3 < T1 + T2, then increasing the opening degree D2 of the second throttling device; if T3 = T1 + T2, maintaining the original state.

[0016] Furthermore, the air conditioning control method is applied to the aforementioned air conditioning system. The conventional heating mode includes: controlling the opening of the first throttling device to the maximum, and adjusting the second throttling device to a suitable opening; the medium flowing out of the outdoor unit enters the indoor unit through the second pipe, part of the medium enters the third heat exchanger to release heat, thereby raising the indoor temperature; the other part of the medium enters the first heat exchanger and the second heat exchanger in sequence to release heat, and after passing through the first throttling device, the two parts of the medium merge, and after being depressurized and cooled by the second throttling device, they return to the outdoor unit through the first pipe to complete the cycle.

[0017] Furthermore, the conventional heating mode also includes: controlling the first compressor in the outdoor unit to work, and the medium compressed by the first compressor enters the indoor unit through the second pipeline; acquiring the user-set temperature T1, the preset deviation parameter T2 and the indoor ambient temperature T3, and then comparing T1 with T3; if T3 > T1 + T2, then increasing the opening degree D2 of the second throttling device; if T3 < T1 + T2, then decreasing the opening degree D2 of the second throttling device; if T3 = T1 + T2, maintaining the original state.

[0018] Furthermore, the air conditioning control method is applied to the aforementioned air conditioning system. The auxiliary heating mode includes: controlling the first throttling device and the second throttling device to adjust to a suitable opening degree; the medium flowing out of the outdoor unit enters the indoor unit through the second pipeline, mixes with the medium flowing out of the first heat exchanger, and then enters the third heat exchanger to release heat, thereby raising the indoor temperature; a portion of the medium is depressurized and cooled by the first throttling device, enters the second heat exchanger to absorb heat, and then returns to the bypass compressor device to be pressurized and heated before entering the first heat exchanger to release heat, thus completing the circulation of this portion of the medium; another portion of the medium is depressurized and cooled by the second throttling device, and then returns to the outdoor unit through the first pipeline, completing the circulation.

[0019] Furthermore, the auxiliary heating mode also includes: controlling the operation of the first compressor in the outdoor unit, and the medium compressed by the first compressor enters the indoor unit through the second pipeline; acquiring the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3, and then comparing T1 with T3; if T3 > T1 + T2, then increasing the opening degree D1 of the first throttling device; if T3 < T1 + T2, then decreasing the opening degree D1 of the first throttling device; if T3 = T1 + T2, maintaining the original state; during the adjustment process, if the opening degree D1 of the first throttling device has reached its maximum value, then increasing the opening degree D2 of the second throttling device; if the opening degree D1 of the first throttling device has reached its minimum value, then decreasing the opening degree D2 of the second throttling device.

[0020] Furthermore, the air conditioning control method is applied to the aforementioned air conditioning system. The cooling and dehumidification mode includes: controlling the first throttling device and the second throttling device to adjust to a suitable opening degree; the medium flowing out of the outdoor unit enters the second throttling device through the first pipeline, and the second throttling device reduces the pressure and temperature of the medium. Part of the medium enters the third heat exchanger to absorb heat, thereby cooling the indoor temperature; another part of the medium, after being reduced in pressure and temperature by the first throttling device, enters the second heat exchanger to absorb heat, thereby condensing the moisture in the indoor air on the second heat exchanger. Then, it enters the bypass compression device to be pressurized and heated, and enters the first heat exchanger to release heat, thereby making the outlet air temperature of the indoor unit higher than the dew point. Finally, the two parts of the medium merge and return to the outdoor unit through the second pipeline, completing the cycle.

[0021] Furthermore, the cooling and dehumidification mode also includes: controlling the first compressor in the outdoor unit to work, the medium compressed by the first compressor enters the outdoor heat exchanger to release heat, and then the medium enters the second throttling device from the first pipeline; acquiring the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3, and then comparing T1 with T3; if T3 > T1 + T2, then reducing the opening degree D2 of the second throttling device; if T3 < T1 + T2, then increasing the opening degree D2 of the second throttling device; if T3 = T1 + T2, maintaining the original state; acquiring the temperature T4 of the second heat exchanger, and then comparing T4 with 0℃; if T4 > 0℃ + T2, then increasing the opening degree D1 of the first throttling device; if T4 < 0℃ + T2, then decreasing the opening degree D1 of the first throttling device; if T4 = 0℃ + T2, maintaining the original state.

[0022] Furthermore, the air conditioning control method is applied to the aforementioned air conditioning system. The heating and defrosting mode includes: controlling the first throttling device to adjust to a suitable opening degree, and the second throttling device to its maximum opening degree; the bypass compressor pressurizes and heats the medium, and after it enters the first heat exchanger to release heat, a portion of the medium enters the third heat exchanger to release heat, thereby raising the indoor temperature; another portion of the medium enters the outdoor unit through the second pipeline to defrost the outdoor heat exchanger, and then, after passing through the first pipeline and the second throttling device, the two portions of the medium merge, and after being depressurized and cooled by the first throttling device, they enter the second heat exchanger to absorb heat, and finally return to the bypass compressor to complete the cycle.

[0023] Furthermore, the heating defrosting mode also includes: controlling the opening degree D1 of the first throttling device to be equal to the opening degree D2 of the second throttling device, and controlling the opening degree D2 of the second throttling device to be at its maximum value; controlling the first compressor in the outdoor unit to work, and another part of the medium enters the first compressor through the second pipeline. The medium compressed by the first compressor enters the outdoor heat exchanger to release heat in order to defrost the outdoor heat exchanger; obtaining the temperature T5 of the outdoor heat exchanger, and then comparing T5 with 10℃. If T5>10℃, the heating defrosting mode is stopped and switched to other modes. If T5≤10℃, the original state is maintained.

[0024] Furthermore, in the conventional heating mode or auxiliary heating mode, the outdoor heat exchanger temperature T5 and the outdoor ambient temperature T6 are obtained. Then, T6 is compared with -8.5℃ and 5.5℃, and T5 is compared with 0℃. If -8.5℃≤T6≤5.5℃ and T5<0℃ for more than 30 minutes, the system switches to the heating defrosting mode. If T6≤-8.5℃ and T5<0℃ for more than 120 minutes, the system switches to the heating defrosting mode.

[0025] According to one aspect of the present invention, an air conditioning system is provided, including an indoor unit and an outdoor unit. The outdoor unit includes an outdoor heat exchanger and a first compressor. The outdoor unit and the indoor unit are connected through a first pipeline and a second pipeline to form a circulation pipeline. The indoor unit includes a bypass compression device, a first heat exchanger, a second heat exchanger, and a third heat exchanger. The two ends of the third heat exchanger are respectively connected to the first pipeline and the second pipeline. One end of the second heat exchanger is connected to the first pipeline, and the other end of the second heat exchanger is connected to the bypass compression device. The bypass compression device is connected to one end of the first heat exchanger, and the other end of the first heat exchanger is connected to the second pipeline. The bypass compression device has a power-off state and a working state. In the power-off state, the other end of the second heat exchanger is directly connected to one end of the first heat exchanger. In the working state, the bypass compression device compresses the medium flowing out from the other end of the second heat exchanger and delivers it into the first heat exchanger. The air intake of the indoor unit passes through the third heat exchanger, the second heat exchanger, and the first heat exchanger in sequence for heat exchange before being blown out.

[0026] The air conditioning system proposed in this invention controls the bypass compressor to operate, controlling the second and third heat exchangers to absorb heat and the first heat exchanger to release heat, thereby ensuring that the indoor unit's outlet air temperature is higher than the dew point and cooling the room. Moisture in the indoor air condenses on the second and / or third heat exchangers, achieving both cooling and dehumidification while solving the problem of water droplets easily appearing at the air conditioner outlet under high humidity conditions. When users need to cool and dehumidify the room, this invention, by setting the first compressor and the bypass compressor to work together, ensures both effective cooling and reduces the humidity of the supply air, thus avoiding condensation at the outlet after the supply air mixes with the indoor air during high humidity cooling. Furthermore, after dehumidification is complete, this invention can quickly switch back to the conventional cooling mode, maximizing cooling efficiency.

[0027] By controlling the bypass compressor to operate, the second heat exchanger absorbs heat, while the first and third heat exchangers release heat, thus defrosting the outdoor heat exchanger in the outdoor unit and raising the indoor temperature. This solves the problem that when defrosting the outdoor heat exchanger, the indoor unit has no significant heat output due to the limited power of the first compressor, thereby improving the user experience. In this invention, when defrosting the outdoor heat exchanger, the second and third heat exchangers act as heat storage and release devices, while the first compressor and bypass compressor act as heat sources, ensuring that the indoor unit can continue to output heat to the room in a timely manner during defrosting.

[0028] By controlling the bypass compressor to be in working condition, the second heat exchanger absorbs heat while the first and third heat exchangers release heat, thereby raising the indoor temperature. This ensures that when auxiliary heating is needed, the bypass compressor can be used as the heating source without affecting the heating efficiency of the first compressor in the outdoor unit, thus always ensuring optimal heating efficiency. Compared with existing technical solutions that add an extra electric auxiliary heating structure, this invention does not affect the air duct, reducing safety hazards and simplifying the air conditioner structure. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 A schematic diagram of the internal structure of an air conditioning system provided in an embodiment of the present invention is shown;

[0031] Figure 2 This diagram illustrates the working cycle of an air conditioning system in conventional cooling mode according to an embodiment of the present invention.

[0032] Figure 3 This diagram illustrates the working cycle of an air conditioning system in conventional heating mode according to an embodiment of the present invention.

[0033] Figure 4 This diagram illustrates the working cycle of an air conditioning system in auxiliary heating mode according to an embodiment of the present invention.

[0034] Figure 5 This diagram illustrates the working cycle of an air conditioning system in cooling and dehumidification mode according to an embodiment of the present invention.

[0035] Figure 6 A schematic diagram of the working cycle of an air conditioning system in heating and defrosting mode provided by an embodiment of the present invention is shown.

[0036] The above figures include the following reference numerals:

[0037] 10. First pipeline;

[0038] 20. Second pipeline;

[0039] 30. Outdoor unit; 31. Outdoor heat exchanger; 32. First compressor; 33. Four-way valve; 331. First port; 332. Second port; 333. Third port; 334. Fourth port; 34. Outdoor fan;

[0040] 40. Indoor unit; 41. Bypass compressor; 411. First solenoid valve; 412. Second compressor; 42. First heat exchanger; 43. Second heat exchanger; 44. Third heat exchanger; 45. Indoor fan;

[0041] 50. First throttling device;

[0042] 60. Second throttling device. Detailed Implementation

[0043] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0044] like Figures 1 to 6 As shown, an embodiment of the present invention provides an air conditioning system, including an indoor unit 40 and an outdoor unit 30; the outdoor unit 30 includes an outdoor heat exchanger 31 and a first compressor 32; the outdoor unit 30 and the indoor unit 40 are connected through a first pipe 10 and a second pipe 20 to form a circulation pipe;

[0045] The indoor unit 40 includes a bypass compression device 41, a first heat exchanger 42, a second heat exchanger 43, and a third heat exchanger 44. Both ends of the third heat exchanger 44 are connected to the first pipeline 10 and the second pipeline 20, respectively. One end of the second heat exchanger 43 is connected to the first pipeline 10, and the other end of the second heat exchanger 43 is connected to the bypass compression device 41. The bypass compression device 41 is connected to one end of the first heat exchanger 42, and the other end of the first heat exchanger 42 is connected to the second pipeline 20. The bypass compression device 41 has an off state and an operating state. In the off state, the other end of the second heat exchanger 43 is directly connected to one end of the first heat exchanger 42. In the operating state, the bypass compression device 41 compresses the medium flowing out from the other end of the second heat exchanger 43 and delivers it into the first heat exchanger 42.

[0046] In this process, the air intake of the indoor unit 40 passes through the third heat exchanger 44, the second heat exchanger 43 and the first heat exchanger 42 in sequence for heat exchange before being blown out.

[0047] The air conditioning system proposed in this invention controls the bypass compressor 41 to operate, controlling the second heat exchanger 43 and the third heat exchanger 44 to absorb heat and the first heat exchanger 42 to release heat, so that the outlet air temperature of the indoor unit 40 is higher than the dew point, thereby cooling the room. Moisture in the indoor air condenses on the second heat exchanger 43 and / or the third heat exchanger 44, which not only achieves cooling and dehumidification of the room, but also solves the problem of water drifting at the air conditioner outlet under high indoor humidity conditions. When the user needs to cool and dehumidify the room, this invention sets the first compressor 32 and the bypass compressor 41 to work together, which not only ensures the indoor cooling effect, but also reduces the humidity of the supply air, thereby avoiding the problem of condensation at the air outlet after the supply air mixes with the indoor air during high humidity cooling. At the same time, after the indoor dehumidification is completed, this invention can quickly switch back to the conventional cooling mode at any time, maximizing the cooling efficiency.

[0048] By controlling the bypass compressor 41 to be in working state, the second heat exchanger 43 absorbs heat, and the first heat exchanger 42 and the third heat exchanger 44 release heat, so as to defrost the outdoor heat exchanger 31 in the outdoor unit 30 and raise the indoor temperature. This solves the problem that when the outdoor heat exchanger 31 is heated and defrosted, the indoor unit 40 does not output significant heat to the room due to the limited power of the first compressor 32, thereby improving the user experience. In this invention, when the outdoor heat exchanger 31 is heated and defrosted, the second heat exchanger 43 and the third heat exchanger 44 act as heat storage and heat release devices, and the first compressor 32 and the bypass compressor 41 act as heat sources, ensuring that the indoor unit 40 can continue to output heat to the room in a timely manner during the defrosting period.

[0049] By controlling the bypass compressor 41 to be in working condition, the second heat exchanger 43 absorbs heat, while the first heat exchanger 42 and the third heat exchanger 44 release heat, thereby raising the indoor temperature. This ensures that when auxiliary heating is needed, the bypass compressor 41 can be used as the heating source without affecting the heating efficiency of the first compressor 32 in the outdoor unit 30, thus always ensuring optimal heating efficiency. Compared with existing technical solutions that add an additional electric auxiliary heating structure, this invention does not affect the air duct, reducing safety hazards and simplifying the air conditioner structure.

[0050] like Figure 1 As shown, the air conditioning system also includes a first throttling device 50 and a second throttling device 60 for depressurizing and cooling the medium. One end of the second throttling device 60 is connected to the first pipeline 10, and the other end of the second throttling device 60 is connected to the third heat exchanger 44 and one end of the first throttling device 50, respectively. The other end of the first throttling device 50 is connected to the second heat exchanger 43.

[0051] By setting a first throttling device 50 and a second throttling device 60 for cooling and pressure reduction, flexible control is achieved in multiple operating modes of the air conditioning system. In addition, it is worth noting that the opening degree adjustment of the first throttling device 50 can be coordinated with the power adjustment of the second compressor 412 to achieve precise control of the auxiliary heating power in the auxiliary heating mode.

[0052] like Figure 1 As shown, the first throttling device 50 is installed indoors, and the second throttling device 60 is installed indoors or outdoors; both the first throttling device 50 and the second throttling device 60 are valve-type devices with adjustable opening. This arrangement not only improves the applicability of the first throttling device 50 and the second throttling device 60, but also facilitates the procurement, maintenance, and replacement of the first throttling device 50 and the second throttling device 60.

[0053] In one specific embodiment of the present invention, the first throttling device 50 and the second throttling device 60 are electronic expansion valves.

[0054] like Figure 1 As shown, the second heat exchanger 43 and the first heat exchanger 42 are separate structures and are spaced apart; the second heat exchanger 43 and the third heat exchanger 44 are also separate structures and are spaced apart; or, the second heat exchanger 43 and the third heat exchanger 44 are formed by separating an integral heat exchanger through internal piping. By setting the second heat exchanger 43 and the first heat exchanger 42 as separate structures and spaced apart, it is ensured that the first heat exchanger 42 can be placed close to the air conditioner outlet, achieving efficient temperature control of the air conditioner outlet; by setting the second heat exchanger 43 and the third heat exchanger 44 as an integral heat exchanger separated by internal piping, costs are effectively reduced and internal space of the indoor unit is saved.

[0055] like Figure 1 As shown, the indoor unit 40 also includes an indoor fan 45 for driving airflow, which is disposed between the second heat exchanger 43 and the first heat exchanger 42; the first heat exchanger 42 is disposed at the air outlet of the indoor unit 40. By disposing the indoor fan 45 between the second heat exchanger 43 and the first heat exchanger 42, efficient airflow is achieved at the air outlet of the indoor unit 40; and by disposing the first heat exchanger 42 at the air outlet of the indoor unit 40, efficient temperature control of the air conditioning output is achieved.

[0056] like Figure 1 As shown, the heat exchange areas of the second heat exchanger 43 and the third heat exchanger 44 are both no less than the heat exchange area of ​​the first heat exchanger 42. This arrangement ensures that the third heat exchanger 44 can primarily affect the temperature of the air outlet, while the first heat exchanger 42 provides precise control over the outlet temperature. Furthermore, it ensures that during the heating and defrosting mode of the air conditioning system, the heat stored by the second heat exchanger 43 and the third heat exchanger 44 as heat storage and release devices meets the actual usage requirements.

[0057] like Figure 1 As shown, the bypass compression device 41 includes a first solenoid valve 411 and a second compressor 412. The two ends of the first solenoid valve 411 are respectively connected to the other end of the second heat exchanger 43 and one end of the first heat exchanger 42. The two ends of the second compressor 412 are respectively connected to the other end of the second heat exchanger 43 and one end of the first heat exchanger 42. In the off state, the second compressor 412 is closed, and the first solenoid valve 411 is normally open, directly connecting the other end of the second heat exchanger 43 to one end of the first heat exchanger 42. In the working state, the first solenoid valve 411 is normally closed, and the second compressor 412 compresses the medium flowing out from the other end of the second heat exchanger 43 and delivers it into the first heat exchanger 42. This configuration simplifies the structure of the bypass compression device 41, effectively reduces costs, and facilitates installation and subsequent maintenance.

[0058] In a specific embodiment of the present invention, the bypass compression device 41 may also be a compressor with bypass function. For example, if the second compressor 412 has a built-in bypass valve system, the first solenoid valve 411 can be cancelled and the bypass valve built into the second compressor 412 can be controlled to switch the state of the bypass compression device 41.

[0059] In another specific embodiment of the present invention, the first solenoid valve 411 may be a commonly available electric valve for easy procurement.

[0060] like Figure 1 As shown, the outdoor unit 30 also includes a four-way valve 33. The four-way valve 33 has a first port 331, a second port 332, a third port 333, and a fourth port 334. The first port 331 is connected to the second pipeline 20; the second port 332 is connected to one end of the first compressor 32; the other end of the first compressor 32 is connected to the fourth port 334; and the third port 333 is connected to one end of the outdoor heat exchanger 31; the other end of the outdoor heat exchanger 31 is connected to the second pipeline 20. The four-way valve 33 has a first switching state and a second switching state. In the first switching state, the first port 331 is connected to the second port 332, and the third port 333 is connected to the fourth port 334. In the second switching state, the first port 331 is connected to the fourth port 334, and the third port 333 is connected to the second port 332. By setting the four-way valve 33, reliable switching of the flow direction of the medium inside the air conditioning system is achieved, thereby ensuring the reliable operation of the air conditioning system in multiple operating modes.

[0061] In one specific embodiment of the present invention, such as Figure 1 As shown, the outdoor unit 30 also includes an outdoor fan 34, which is used to drive airflow to exchange heat with the outdoor heat exchanger 31.

[0062] The present invention also provides an air conditioning control method, applied to the above-mentioned air conditioning system, the air conditioning control method including at least one of the following modes:

[0063] like Figure 2 As shown, in the normal cooling mode: the bypass compressor 41 is controlled to be in the off state, and the first heat exchanger 42, the second heat exchanger 43 and the third heat exchanger 44 are controlled to absorb heat to cool the room.

[0064] like Figure 3 As shown, in the normal heating mode: the bypass compressor 41 is in the off state, and the first heat exchanger 42, the second heat exchanger 43 and the third heat exchanger 44 release heat to raise the indoor temperature.

[0065] like Figure 4 As shown, in the auxiliary heating mode: the bypass compressor 41 is controlled to be in working condition, the second heat exchanger 43 is controlled to absorb heat, and the first heat exchanger 42 and the third heat exchanger 44 release heat to raise the indoor temperature.

[0066] like Figure 5 As shown, in the cooling and dehumidification mode: the bypass compressor 41 is controlled to be in working condition, the second heat exchanger 43 and the third heat exchanger 44 are controlled to absorb heat, and the first heat exchanger 42 releases heat, so that the outlet air temperature of the indoor unit 40 is higher than the dew point and the indoor temperature is lowered; the moisture in the indoor air condenses on the second heat exchanger 43 and / or the third heat exchanger 44.

[0067] like Figure 6 As shown, in the heating and defrosting mode: the bypass compressor 41 is controlled to be in working condition, the second heat exchanger 43 is controlled to absorb heat, and the first heat exchanger 42 and the third heat exchanger 44 release heat, so as to defrost the outdoor heat exchanger 31 in the outdoor unit 30 and raise the indoor temperature.

[0068] By setting up the above multiple working modes, we can meet the diverse usage needs of customers, thereby improving the user experience.

[0069] like Figure 2 As shown, the conventional cooling mode includes: controlling the first throttling device 50 to its maximum opening, and adjusting the second throttling device 60 to a suitable opening; the medium flowing out of the outdoor unit 30 enters the second throttling device 60 through the first pipe 10, where the second throttling device 60 reduces the pressure and temperature of the medium. A portion of the medium enters the third heat exchanger 44 to absorb heat, while the other portion passes through the first throttling device 50 and sequentially enters the second heat exchanger 43 and the first heat exchanger 42 to absorb heat. Finally, the two portions of medium merge and return to the outdoor unit 30 through the second pipe 20, completing the cycle. In this mode, by controlling the bypass compressor 41 to be in the off state, a balance between energy saving and cooling is achieved.

[0070] like Figure 2As shown, the conventional cooling mode also includes: controlling the first compressor 32 in the outdoor unit 30 to operate; the medium compressed by the first compressor 32 enters the outdoor heat exchanger 31 to release heat; then the medium enters the second throttling device 60 from the first pipe 10; acquiring the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3; then comparing T1 and T3; if T3 > T1 + T2, then reducing the opening degree D2 of the second throttling device 60; if T3 < T1 + T2, then increasing the opening degree D2 of the second throttling device 60; if T3 = T1 + T2, maintaining the original state. This setting ensures that the conventional cooling mode meets the user's normal indoor cooling needs.

[0071] like Figure 3 As shown, the conventional heating mode includes: controlling the opening of the first throttling device 50 to its maximum, and adjusting the second throttling device 60 to a suitable opening; the medium flowing out of the outdoor unit 30 enters the indoor unit 40 through the second pipe 20, part of the medium enters the third heat exchanger 44 to release heat, thereby raising the indoor temperature; the other part of the medium sequentially enters the first heat exchanger 42 and the second heat exchanger 43 to release heat, and after passing through the first throttling device 50, the two parts of the medium merge, and after being depressurized and cooled by the second throttling device 60, return to the outdoor unit 30 through the first pipe 10, completing the cycle. In this mode, by controlling the bypass compressor 41 to be in the off state, a balance between energy saving and heating is achieved.

[0072] like Figure 3 As shown, the conventional heating mode also includes: controlling the first compressor 32 in the outdoor unit 30 to operate, and the medium compressed by the first compressor 32 enters the indoor unit 40 through the second pipe 20; acquiring the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3, and then comparing T1 with T3; if T3 > T1 + T2, then increasing the opening degree D2 of the second throttling device 60; if T3 < T1 + T2, then decreasing the opening degree D2 of the second throttling device 60; if T3 = T1 + T2, maintaining the original state. This setting ensures that the conventional heating mode meets the user's normal indoor heating needs.

[0073] like Figure 4 As shown, the auxiliary heating mode includes: controlling the first throttling device 50 and the second throttling device 60 to adjust to a suitable opening degree; the medium flowing out of the outdoor unit 30 enters the indoor unit 40 through the second pipeline 20, mixes with the medium flowing out of the first heat exchanger 42, and then enters the third heat exchanger 44 to release heat, so as to raise the indoor temperature; a part of the medium is depressurized and cooled by the first throttling device 50, enters the second heat exchanger 43 to absorb heat, and then returns to the bypass compression device 41 to be pressurized and heated, and then enters the first heat exchanger 42 to release heat, and this part of the medium completes the circulation; another part of the medium is depressurized and cooled by the second throttling device 60, and returns to the outdoor unit 30 through the first pipeline 10 to complete the circulation.

[0074] By controlling the bypass compressor 41 to be in working condition, the second heat exchanger 43 absorbs heat, while the first heat exchanger 42 and the third heat exchanger 44 release heat, thereby raising the indoor temperature. This ensures that when auxiliary heating is needed, the bypass compressor 41 can be used as the heating source without affecting the heating efficiency of the first compressor 32 in the outdoor unit 30, thus always ensuring optimal heating efficiency. Compared with existing technical solutions that add an additional electric auxiliary heating structure, this invention does not affect the air duct, reducing safety hazards and simplifying the air conditioner structure.

[0075] like Figure 4 As shown, the auxiliary heating mode also includes: controlling the operation of the first compressor 32 in the outdoor unit 30, and the medium compressed by the first compressor 32 enters the indoor unit 40 through the second pipe 20; acquiring the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3, and then comparing T1 with T3; if T3 > T1 + T2, then increasing the opening degree D1 of the first throttling device 50; if T3 < T1 + T2, then decreasing the opening degree D1 of the first throttling device 50; if T3 = T1 + T2, maintaining the original state; during the adjustment process, if the opening degree D1 of the first throttling device 50 has reached its maximum value, then increasing the opening degree D2 of the second throttling device 60; if the opening degree D1 of the first throttling device 50 has reached its minimum value, then decreasing the opening degree D2 of the second throttling device 60. This setting achieves efficient and reliable adjustment of the indoor ambient temperature T3 in the auxiliary heating mode.

[0076] like Figure 5 As shown, the cooling and dehumidification mode includes: controlling the first throttling device 50 and the second throttling device 60 to adjust to a suitable opening degree; the medium flowing out of the outdoor unit 30 enters the second throttling device 60 through the first pipe 10, and the second throttling device 60 reduces the pressure and temperature of the medium. Part of the medium enters the third heat exchanger 44 to absorb heat, thereby cooling the indoor temperature; the other part of the medium, after being reduced in pressure and temperature by the first throttling device 50, enters the second heat exchanger 43 to absorb heat, thereby condensing the moisture in the indoor air on the second heat exchanger 43, and then enters the bypass compression device 41 to be pressurized and heated, and enters the first heat exchanger 42 to release heat, so that the outlet air temperature of the indoor unit 40 is higher than the dew point. Finally, the two parts of the medium merge and return to the outdoor unit 30 through the second pipe 20, completing the cycle.

[0077] By controlling the bypass compressor 41 to be in working state, the second heat exchanger 43 and the third heat exchanger 44 absorb heat, while the first heat exchanger 42 releases heat, so that the outlet air temperature of the indoor unit 40 is higher than the dew point, and the indoor temperature is lowered. The moisture in the indoor air condenses on the second heat exchanger 43 and / or the third heat exchanger 44, which not only achieves cooling and dehumidification of the room, but also solves the problem of water drifting from the air conditioner outlet under high indoor humidity conditions. When the user needs to cool and dehumidify the room, the present invention sets the first compressor 32 and the bypass compressor 41 to work together, which not only ensures the indoor cooling effect, but also reduces the humidity of the supply air, thereby avoiding the problem of condensation at the air outlet after the supply air mixes with the indoor air during high humidity cooling. At the same time, after the indoor dehumidification is completed, the present invention can quickly switch back to the conventional cooling mode at any time, maximizing the cooling efficiency.

[0078] like Figure 5 As shown, the cooling and dehumidification mode also includes: controlling the first compressor 32 in the outdoor unit 30 to work, the medium compressed by the first compressor 32 enters the outdoor heat exchanger 31 to release heat, and then the medium enters the second throttling device 60 from the first pipe 10; acquiring the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3, and then comparing T1 with T3; if T3 > T1 + T2, then reducing the opening degree D2 of the second throttling device 60; if T3 < T1 + T2, then increasing the opening degree D2 of the second throttling device 60; if T3 = T1 + T2, maintaining the original state; acquiring the temperature T4 of the second heat exchanger 43, and then comparing T4 with 0℃; if T4 > 0℃ + T2, then increasing the opening degree D1 of the first throttling device 50; if T4 < 0℃ + T2, then reducing the opening degree D1 of the first throttling device 50; if T4 = 0℃ + T2, maintaining the original state. This setting ensures the efficient cooling and dehumidification effect of the second heat exchanger 43 for the indoor environment.

[0079] like Figure 6 As shown, the heating defrosting mode includes: controlling the first throttling device 50 to adjust to a suitable opening, and the second throttling device 60 to its maximum opening; the bypass compression device 41 pressurizes and heats the medium, and after entering the first heat exchanger 42 to release heat, a portion of the medium enters the third heat exchanger 44 to release heat, thereby raising the indoor temperature; another portion of the medium enters the outdoor unit 30 through the second pipeline 20 to defrost the outdoor heat exchanger 31, and then after passing through the first pipeline 10 and the second throttling device 60, the two portions of the medium merge, and after being depressurized and cooled by the first throttling device 50, they enter the second heat exchanger 43 to absorb heat, and finally return to the bypass compression device 41 to complete the cycle.

[0080] By controlling the bypass compressor 41 to be in working state, the second heat exchanger 43 absorbs heat, and the first heat exchanger 42 and the third heat exchanger 44 release heat, so as to defrost the outdoor heat exchanger 31 in the outdoor unit 30 and raise the indoor temperature. This solves the problem that when the outdoor heat exchanger 31 is heated and defrosted, the indoor unit 40 does not output significant heat to the room due to the limited power of the first compressor 32, thereby improving the user experience. In this invention, when the outdoor heat exchanger 31 is heated and defrosted, the second heat exchanger 43 and the third heat exchanger 44 act as heat storage and heat release devices, and the first compressor 32 and the bypass compressor 41 act as heat sources, ensuring that the indoor unit 40 can continue to output heat to the room in a timely manner during the defrosting period.

[0081] like Figure 6 As shown, the heating defrosting mode also includes: controlling the opening degree D1 of the first throttling device 50 to be equal to the opening degree D2 of the second throttling device 60, and controlling the opening degree D2 of the second throttling device 60 to be at its maximum value; controlling the first compressor 32 in the outdoor unit 30 to work, with another part of the medium entering the first compressor 32 through the second pipeline 20, and the medium compressed by the first compressor 32 entering the outdoor heat exchanger 31 to release heat and defrost the outdoor heat exchanger 31; obtaining the temperature T5 of the outdoor heat exchanger 31, and then comparing T5 with 10℃. If T5 > 10℃, the heating defrosting mode is stopped and switched to another mode; if T5 ≤ 10℃, the original state is maintained. This setting ensures efficient defrosting of the outdoor heat exchanger 31 while avoiding energy waste.

[0082] Specifically, in either the regular heating mode or the auxiliary heating mode, the system acquires the temperature T5 of the outdoor heat exchanger 31 and the outdoor ambient temperature T6. Then, it compares T6 with -8.5℃ and 5.5℃, and compares T5 with 0℃. If -8.5℃ ≤ T6 ≤ 5.5℃ and T5 < 0℃ for more than 30 minutes, the system switches to heating / defrosting mode. If T6 ≤ -8.5℃ and T5 < 0℃ for more than 120 minutes, the system switches to heating / defrosting mode. This setting allows the air conditioning system to automatically switch to heating / defrosting mode as needed, effectively protecting the outdoor heat exchanger 31 and improving the intelligence of the air conditioning system.

[0083] The following is a detailed description of a specific embodiment of the present invention: the first heat exchanger 42 is located on the air outlet side of the indoor unit 40 air duct, the third heat exchanger 44 is located on the air inlet side of the indoor unit 40 air duct, the second heat exchanger 43 is located between the first heat exchanger 42 and the third heat exchanger 44, the first throttling device 50 is located between the second heat exchanger 43 and the third heat exchanger 44, and the second throttling device 60 is located between the third heat exchanger 44 and the outdoor heat exchanger 31.

[0084] Now targeting Figure 2Detailed Explanation: In a specific embodiment of the present invention, when the air conditioning system is performing normal cooling, the first solenoid valve 411 opens, the first compressor 32 runs, the second compressor 412 stops, the first throttling device 50 is at its maximum opening, and the second throttling device 60 is adjusted to a suitable opening. The high-temperature, high-pressure refrigerant discharged from the first compressor 32 enters the outdoor heat exchanger 31 to release heat. After being depressurized and cooled by the second throttling device 60, part of it enters the third heat exchanger 44 to absorb heat, and the other part enters the second heat exchanger 43 and the first heat exchanger 42 through the first throttling device 50 to absorb heat. Subsequently, the two refrigerant streams merge and return to the first compressor 32 to complete the cycle. During this period, the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3 are acquired. Then, T1 and T3 are compared. If T3 > T1 + T2, the opening D2 of the second throttling device 60 is reduced; if T3 < T1 + T2, the opening D2 of the second throttling device 60 is increased; otherwise, the original state is maintained.

[0085] Now targeting Figure 3 Detailed Explanation: In a specific embodiment of the present invention, when the air conditioning system is in normal heating mode, the first solenoid valve 411 opens, the first compressor 32 runs, the second compressor 412 stops, the first throttling device 50 is at its maximum opening, and the second throttling device 60 is adjusted to a suitable opening. A portion of the high-temperature, high-pressure refrigerant discharged from the first compressor 32 enters the third heat exchanger 44 to release heat, while the other portion sequentially passes through the first heat exchanger 42, the second heat exchanger 43, and the first throttling device 50. It then merges with the refrigerant flowing from the third heat exchanger 44 and enters the second throttling device 60 to reduce pressure and temperature. After absorbing heat in the outdoor heat exchanger 31, it returns to the first compressor 32 to complete the cycle. During this process, the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3 are acquired. T1 is compared with T3. If T3 > T1 + T2, the opening D2 of the second throttling device 60 is increased; if T3 < T1 + T2, the opening D2 of the second throttling device 60 is decreased; otherwise, the original state is maintained.

[0086] Now targeting Figure 4Detailed Explanation: In a specific embodiment of the present invention, when the air conditioning system is providing auxiliary heating, the first solenoid valve 411 is closed, the first compressor 32 is running, the second compressor 412 is running, the first throttling device 50 is adjusted to a suitable opening, and the second throttling device 60 is adjusted to a suitable opening. The high-temperature and high-pressure medium discharged from the first compressor 32 mixes with the medium flowing out of the first heat exchanger 42 and enters the third heat exchanger 44 to release heat. Part of it is depressurized and cooled by the first throttling device 50 and then enters the second heat exchanger 43 to absorb heat. Subsequently, it returns to the second compressor 412, is pressurized and heated, and then enters the first heat exchanger 42. After heat release, it returns to the first compressor 32 for circulation. The other part is significantly depressurized and cooled by the second throttling device 60 and then enters the outdoor heat exchanger 31 to absorb heat. Subsequently, it returns to the second compressor 412 to complete the medium circulation of the second compressor 412. During this period, the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3 are acquired. Compare T1 and T3. If T3 > T1 + T2, increase the opening degree D1 of the first throttling device 50. If T3 < T1 + T2, decrease the opening degree D1 of the first throttling device 50. Otherwise, maintain the original state. If D1 has reached its maximum value, increase the opening degree D2 of the second throttling device 60. If D1 has reached its minimum value, decrease the opening degree D2 of the second throttling device 60.

[0087] Now targeting Figure 5 Detailed Explanation: In a specific embodiment of the present invention, when the air conditioning system is performing cooling and dehumidification, the first solenoid valve 411 is closed, the first compressor 32 is running, the second compressor 412 is running, the first throttling device 50 is adjusted to a suitable opening, and the second throttling device 60 is adjusted to a suitable opening. The high-temperature and high-pressure medium discharged from the first compressor 32 enters the outdoor heat exchanger 31 to release heat. After being depressurized and cooled by the second throttling device 60, part of it enters the third heat exchanger 44 to absorb heat, and the other part is further depressurized and cooled by the first throttling device 50 before entering the second heat exchanger 43 to absorb heat further. Subsequently, it is drawn into the second compressor 412 for pressurization and heating, discharged into the first heat exchanger 42 to release heat, and then merges with the medium flowing out from the third heat exchanger 44 before returning to the first compressor 32 to complete the cycle; during this period, the user-set temperature T1, the preset deviation parameter T2, and the indoor ambient temperature T3 are acquired. Compare T1 with T3. If T3 > T1 + T2, decrease the opening D2 of the second throttling device 60. If T3 < T1 + T2, increase the opening D2 of the second throttling device 60. Otherwise, maintain the original state. Compare T4 with 0℃. If T4 > 0℃ + T2, increase the opening D1 of the first throttling device 50. If T4 < 0℃ + T2, decrease the opening D1 of the first throttling device 50. Otherwise, maintain the original state.

[0088] Now targeting Figure 6Detailed Explanation: In a specific embodiment of the present invention, when the air conditioning system is in conventional heating mode or auxiliary heating mode, the outdoor heat exchanger 31 pipe temperature T5 and the outdoor ambient temperature T6 are obtained, and T6 is compared with -8.5℃, 5.5℃, and 0℃. If -8.5℃≤T6≤5.5℃ and T5<0℃ for 30 consecutive minutes, or T6≤-8.5℃ and T5<0℃ for 120 consecutive minutes, then the system enters the heating defrosting mode. At this time, the first solenoid valve 411 is closed, the first compressor 32 is running, the second compressor 412 is running, and the opening degree D1 of the first throttling device 50 is controlled to be equal to the opening degree D2 of the second throttling device 60, so that the opening degree D2 of the second throttling device 60 is at its maximum value. The high-temperature, high-pressure medium discharged from the second compressor 412 enters the first heat exchanger 42 to release heat. Part of it enters the third heat exchanger 44 for further heat release, while the other part is slightly pressurized and heated by the first compressor 32 before entering the outdoor heat exchanger 31 to release heat. After passing through the second throttling device 60, the medium flowing out of the third heat exchanger 44 merges with the medium. After being depressurized and cooled by the first throttling device 50, it enters the second heat exchanger 43 to absorb heat, and finally returns to the second compressor 412 to complete the medium circulation. In the heating defrosting mode, T5 is compared with 10℃. If T5 > 10℃, the heating defrosting mode is exited and the original mode is returned; otherwise, the original state is maintained.

[0089] In summary, this invention provides an air conditioning system and air conditioning control method. The proposed air conditioning system controls the bypass compressor 41 to operate, controlling the second heat exchanger 43 and the third heat exchanger 44 to absorb heat, while the first heat exchanger 42 releases heat, thereby ensuring the indoor unit 40's outlet air temperature is higher than the dew point and cooling the room. Moisture in the indoor air condenses on the second heat exchanger 43 and / or the third heat exchanger 44, achieving both cooling and dehumidification of the room and solving the problem of water droplets easily appearing at the air conditioner outlet under high indoor humidity conditions. When the user needs to cool and dehumidify the room, this invention sets the first compressor 32 and the bypass compressor 41 to work together, ensuring both indoor cooling effect and reducing the humidity of the supply air, thus avoiding condensation at the air outlet after the supply air mixes with the indoor air during high humidity cooling. Furthermore, after dehumidification, this invention can quickly switch back to the conventional cooling mode, maximizing cooling efficiency. By controlling the bypass compressor 41 to operate, controlling the second heat exchanger 43 to absorb heat, and the first heat exchanger 42 and the third heat exchanger 44 to release heat, the system achieves cooling and dehumidification of the room. Heat exchanger 44 releases heat to defrost the outdoor heat exchanger 31 in the outdoor unit 30 and raise the indoor temperature, solving the problem that when defrosting the outdoor heat exchanger 31, the indoor unit 40 has no significant heat output to the indoor unit due to the limited power of the first compressor 32, thus improving the user experience. In this invention, when defrosting the outdoor heat exchanger 31, the second heat exchanger 43 and the third heat exchanger 44 act as heat storage and release devices, while the first compressor 32 and the bypass compressor 41 act as heat sources, ensuring that the indoor unit 40 can continue to supply heat to the indoor unit during defrosting. The system delivers heat to the room in a timely manner. By controlling the bypass compressor 41 to be in working condition, the second heat exchanger 43 absorbs heat, while the first heat exchanger 42 and the third heat exchanger 44 release heat, thereby raising the indoor temperature. This ensures that when auxiliary heating is needed, the bypass compressor 41 can be used as the heating source without affecting the heating efficiency of the first compressor 32 in the outdoor unit 30, thus always ensuring optimal heating efficiency. Compared with existing technical solutions that add an electric auxiliary heating structure, this invention does not affect the air duct, reducing safety hazards and simplifying the air conditioner structure.

[0090] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, modes, operations, devices, components, and / or combinations thereof.

[0091] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components and patterns illustrated in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0092] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0093] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0094] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air conditioning system, comprising an indoor unit (40) and an outdoor unit (30); the outdoor unit (30) comprising an outdoor heat exchanger (31) and a first compressor (32); the outdoor unit (30) and the indoor unit (40) are connected via a first pipe (10) and a second pipe (20) to form a circulation pipeline; characterized in that, The indoor unit (40) includes a bypass compression device (41), a first heat exchanger (42), a second heat exchanger (43), and a third heat exchanger (44); the two ends of the third heat exchanger (44) are respectively connected to the first pipeline (10) and the second pipeline (20); one end of the second heat exchanger (43) is connected to the first pipeline (10), and the other end of the second heat exchanger (43) is connected to the bypass compression device (41). The bypass compression device (41) is connected to one end of the first heat exchanger (42), and the other end of the first heat exchanger (42) is connected to the second pipeline (20). The bypass compression device (41) is connected to the circuit (20); the bypass compression device (41) has a shutdown state and a working state. In the shutdown state, the other end of the second heat exchanger (43) is directly connected to one end of the first heat exchanger (42); in the working state, the bypass compression device (41) compresses the medium flowing out from the other end of the second heat exchanger (43) and delivers it to the first heat exchanger (42); wherein, the air intake of the indoor unit (40) passes through the third heat exchanger (44), the second heat exchanger (43) and the first heat exchanger (42) in sequence for heat exchange and is then blown out.

2. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a first throttling device (50) and a second throttling device (60) for depressurizing and cooling the medium. One end of the second throttling device (60) is connected to the first pipeline (10), and the other end of the second throttling device (60) is connected to the third heat exchanger (44) and one end of the first throttling device (50), respectively. The other end of the first throttling device (50) is connected to the second heat exchanger (43).

3. The air conditioning system according to claim 2, characterized in that, The first throttling device (50) is installed indoors, and the second throttling device (60) is installed indoors or outdoors; the first throttling device (50) and the second throttling device (60) are valve devices with adjustable opening.

4. The air conditioning system according to claim 1, characterized in that, The second heat exchanger (43) and the first heat exchanger (42) are separate structures and are spaced apart; the second heat exchanger (43) and the third heat exchanger (44) are separate structures and are spaced apart; or, the second heat exchanger (43) and the third heat exchanger (44) are formed by separating an integral heat exchanger through internal piping.

5. The air conditioning system according to claim 4, characterized in that, The indoor unit (40) also includes an indoor fan (45) for driving airflow, the indoor fan (45) being disposed between the second heat exchanger (43) and the first heat exchanger (42); the first heat exchanger (42) being disposed at the air outlet of the indoor unit (40).

6. The air conditioning system according to claim 1, characterized in that, The heat exchange area of ​​the second heat exchanger (43) and the third heat exchanger (44) is not less than the heat exchange area of ​​the first heat exchanger (42).

7. The air conditioning system according to claim 1, characterized in that, The bypass compression device (41) includes a first solenoid valve (411) and a second compressor (412); the two ends of the first solenoid valve (411) are respectively connected to the other end of the second heat exchanger (43) and one end of the first heat exchanger (42); the two ends of the second compressor (412) are respectively connected to the other end of the second heat exchanger (43) and one end of the first heat exchanger (42); wherein, in the shutdown state, the second compressor (412) is closed, and the first solenoid valve (411) is normally open to directly connect the other end of the second heat exchanger (43) with one end of the first heat exchanger (42); in the working state, the first solenoid valve (411) is normally closed, and the second compressor (412) compresses the medium flowing out from the other end of the second heat exchanger (43) and delivers it into the first heat exchanger (42).

8. The air conditioning system according to claim 1, characterized in that, The outdoor unit (30) also includes a four-way valve (33), which has a first port (331), a second port (332), a third port (333), and a fourth port (334). The first port (331) is connected to the second pipeline (20), the second port (332) is connected to one end of the first compressor (32), the other end of the first compressor (32) is connected to the fourth port (334), and the third port (333) is connected to one end of the outdoor heat exchanger (31). The other end of the outdoor heat exchanger (31) is connected to the second pipeline (20); wherein the four-way valve (33) has a first switching state and a second switching state. In the first switching state, the first port (331) is connected to the second port (332), and the third port (333) is connected to the fourth port (334); in the second switching state, the first port (331) is connected to the fourth port (334), and the third port (333) is connected to the second port (332).

9. An air conditioning control method, characterized in that, Applied to the air conditioning system according to any one of claims 1 to 8, the air conditioning control method includes at least one of the following modes: Normal cooling mode: The bypass compressor (41) is controlled to be in the off state, and the first heat exchanger (42), the second heat exchanger (43) and the third heat exchanger (44) are controlled to absorb heat to cool the room. Normal heating mode: The bypass compressor (41) is controlled to be in the off state, and the first heat exchanger (42), the second heat exchanger (43) and the third heat exchanger (44) release heat to raise the indoor temperature; Auxiliary heating mode: Control the bypass compression device (41) to be in working state, control the second heat exchanger (43) to absorb heat, and control the first heat exchanger (42) and the third heat exchanger (44) to release heat, so as to raise the indoor temperature; Cooling and dehumidifying mode: The bypass compressor (41) is controlled to be in working state, the second heat exchanger (43) and the third heat exchanger (44) are controlled to absorb heat, and the first heat exchanger (42) releases heat, so that the air outlet temperature of the indoor unit (40) is higher than the dew point and the indoor temperature is lowered; the moisture in the indoor air condenses on the second heat exchanger (43) and / or the third heat exchanger (44); Heating and defrosting mode: Control the bypass compressor (41) to be in working state, control the second heat exchanger (43) to absorb heat, and control the first heat exchanger (42) and the third heat exchanger (44) to release heat, so as to defrost the outdoor heat exchanger (31) in the outdoor unit (30) and raise the indoor temperature.

10. The air conditioning control method according to claim 9, characterized in that, The air conditioning control method is applied to the air conditioning system of claim 2. The conventional cooling mode includes: controlling the opening of the first throttling device (50) to the maximum, and adjusting the second throttling device (60) to a suitable opening; the medium flowing out of the outdoor unit (30) enters the second throttling device (60) from the first pipeline (10), the second throttling device (60) reduces the pressure and temperature of the medium, a part of the medium enters the third heat exchanger (44) to absorb heat, and another part of the medium enters the second heat exchanger (43) and the first heat exchanger (42) in sequence through the first throttling device (50) to absorb heat, and finally the two parts of the medium merge and return to the outdoor unit (30) through the second pipeline (20) to complete the cycle.

11. The air conditioning control method according to claim 10, characterized in that, The conventional cooling mode further includes: controlling the first compressor (32) in the outdoor unit (30) to work, the medium compressed by the first compressor (32) enters the outdoor heat exchanger (31) to release heat, and then the medium enters the second throttling device (60) from the first pipeline (10). Get the user-set temperature T1, the preset deviation parameter T2 and the indoor ambient temperature T3, and then compare T1 with T3; if T3 > T1 + T2, then reduce the opening degree D2 of the second throttling device (60); if T3 < T1 + T2, then increase the opening degree D2 of the second throttling device (60); if T3 = T1 + T2, maintain the original state.

12. The air conditioning control method according to claim 9, characterized in that, The air conditioning control method is applied to the air conditioning system of claim 2. The conventional heating mode includes: controlling the opening of the first throttling device (50) to the maximum, and adjusting the second throttling device (60) to a suitable opening; the medium flowing out of the outdoor unit (30) enters the indoor unit (40) from the second pipeline (20), part of the medium enters the third heat exchanger (44) to release heat, so as to raise the indoor temperature; the other part of the medium enters the first heat exchanger (42) and the second heat exchanger (43) in sequence to release heat. After passing through the first throttling device (50), the two parts of the medium merge, and after being depressurized and cooled by the second throttling device (60), they return to the outdoor unit (30) through the first pipeline (10) to complete the cycle.

13. The air conditioning control method according to claim 12, characterized in that, The conventional heating mode also includes: controlling the first compressor (32) in the outdoor unit (30) to work, and the medium compressed by the first compressor (32) enters the indoor unit (40) from the second pipeline (20). Get the user-set temperature T1, the preset deviation parameter T2 and the indoor ambient temperature T3, and then compare T1 with T3; if T3>T1+T2, increase the opening degree D2 of the second throttling device (60); if T3<T1+T2, decrease the opening degree D2 of the second throttling device (60); if T3=T1+T2, maintain the original state.

14. The air conditioning control method according to claim 9, characterized in that, The air conditioning control method is applied to the air conditioning system of claim 2. The auxiliary heating mode includes: controlling the first throttling device (50) and the second throttling device (60) to adjust to a suitable opening degree; the medium flowing out of the outdoor unit (30) enters the indoor unit (40) through the second pipeline (20), mixes with the medium flowing out of the first heat exchanger (42), and enters the third heat exchanger (44) to release heat, so as to raise the indoor temperature; a part of the medium is depressurized and cooled by the first throttling device (50), enters the second heat exchanger (43) to absorb heat, and then returns to the bypass compressor (41) to be pressurized and heated, and enters the first heat exchanger (42) to release heat, and this part of the medium completes the circulation; another part of the medium is depressurized and cooled by the second throttling device (60), and returns to the outdoor unit (30) through the first pipeline (10) to complete the circulation.

15. The air conditioning control method according to claim 14, characterized in that, The auxiliary heating mode further includes: controlling the first compressor (32) in the outdoor unit (30) to work, and the medium compressed by the first compressor (32) enters the indoor unit (40) from the second pipeline (20). Get the user-set temperature T1, preset deviation parameter T2 and indoor ambient temperature T3, and then compare T1 with T3; if T3 > T1 + T2, increase the opening degree D1 of the first throttling device (50); if T3 < T1 + T2, decrease the opening degree D1 of the first throttling device (50); if T3 = T1 + T2, maintain the original state; during the adjustment process, if the opening degree D1 of the first throttling device (50) has reached the maximum value, then change to increase the opening degree D2 of the second throttling device (60); if the opening degree D1 of the first throttling device (50) has reached the minimum value, then change to decrease the opening degree D2 of the second throttling device (60).

16. The air conditioning control method according to claim 9, characterized in that, The air conditioning control method is applied to the air conditioning system of claim 2. The cooling and dehumidification mode includes: controlling the first throttling device (50) and the second throttling device (60) to adjust to a suitable opening degree; the medium flowing out of the outdoor unit (30) enters the second throttling device (60) from the first pipeline (10), the second throttling device (60) depressurizes and cools the medium, part of the medium enters the third heat exchanger (44) to absorb heat, so as to cool the room; another part of the medium, after being depressurized and cooled by the first throttling device (50), enters the second heat exchanger (43) to absorb heat, so as to condense the moisture in the indoor air on the second heat exchanger (43), and then enters the bypass compression device (41) to pressurize and heat up, and enters the first heat exchanger (42) to release heat, so as to make the outlet air temperature of the indoor unit (40) higher than the dew point. Finally, the two parts of the medium merge and return to the outdoor unit (30) through the second pipeline (20) to complete the cycle.

17. The air conditioning control method according to claim 16, characterized in that, The cooling and dehumidification mode further includes: controlling the first compressor (32) in the outdoor unit (30) to work, the medium compressed by the first compressor (32) enters the outdoor heat exchanger (31) to release heat, and then the medium enters the second throttling device (60) from the first pipeline (10). Get the user-set temperature T1, the preset deviation parameter T2 and the indoor ambient temperature T3, and then compare T1 with T3; if T3 > T1 + T2, then reduce the opening degree D2 of the second throttling device (60); if T3 < T1 + T2, then increase the opening degree D2 of the second throttling device (60); if T3 = T1 + T2, maintain the original state. The temperature T4 of the second heat exchanger (43) is obtained, and then T4 is compared with 0℃. If T4 > 0℃ + T2, the opening degree D1 of the first throttling device (50) is increased. If T4 < 0℃ + T2, the opening degree D1 of the first throttling device (50) is decreased. If T4 = 0℃ + T2, the original state is maintained.

18. The air conditioning control method according to claim 9, characterized in that, The air conditioning control method is applied to the air conditioning system of claim 2. The heating and defrosting mode includes: controlling the first throttling device (50) to adjust to a suitable opening degree, and the second throttling device (60) to the maximum opening degree; the bypass compression device (41) pressurizes and heats the medium, and after entering the first heat exchanger (42) to release heat, a part of the medium enters the third heat exchanger (44) to release heat, so as to raise the indoor temperature; another part of the medium enters the outdoor unit (30) through the second pipeline (20) to defrost the outdoor heat exchanger (31), and then after passing through the first pipeline (10) and the second throttling device (60), the two parts of the medium merge, and after passing through the first throttling device (50) to reduce pressure and temperature, enter the second heat exchanger (43) to absorb heat, and finally return to the bypass compression device (41) to complete the cycle.

19. The air conditioning control method according to claim 18, characterized in that, The heating defrosting mode also includes: The opening degree D1 of the first throttling device (50) is controlled to be equal to the opening degree D2 of the second throttling device (60), and the opening degree D2 of the second throttling device (60) is controlled to be the maximum value. The first compressor (32) in the outdoor unit (30) is controlled to work, and another part of the medium enters the first compressor (32) through the second pipeline (20). The medium compressed by the first compressor (32) enters the outdoor heat exchanger (31) to release heat, so as to defrost the outdoor heat exchanger (31). Get the temperature T5 of the outdoor heat exchanger (31), and then compare T5 with 10℃. If T5>10℃, stop the heating defrosting mode and switch to other modes. If T5≤10℃, maintain the original state.

20. The air conditioning control method according to claim 9, characterized in that, In the conventional heating mode or the auxiliary heating mode, the temperature T5 of the outdoor heat exchanger (31) and the outdoor ambient temperature T6 are obtained. Then, T6 is compared with -8.5℃ and 5.5℃, and T5 is compared with 0℃. If -8.5℃≤T6≤5.5℃ and T5<0℃ lasts for more than 30 minutes, the system switches to the heating defrosting mode. If T6≤-8.5℃ and T5<0℃ lasts for more than 120 minutes, the system switches to the heating defrosting mode.

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