Control method of air conditioner, air conditioner, and storage medium

Abstract

The application discloses a control method of an air conditioner, the air conditioner and a storage medium, and relates to the technical field of air conditioners. The air conditioner comprises a first indoor heat exchanger, a differential pressure throttling valve and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is arranged to be capable of switching a minimum flow area and / or a working state based on a pressure difference between two ends of the differential pressure throttling valve and / or a momentum of refrigerant flowing through the differential pressure throttling valve. The method comprises the following steps: controlling the air conditioner to operate in a first mode, wherein the flow area of the differential pressure throttling valve is a first area, and the first indoor heat exchanger and the second indoor heat exchanger are both in an evaporation state; and under the condition that a preset switching condition is met, adjusting the opening of the throttling device by using a target opening adjustment parameter to increase the opening, so that the flow area of the differential pressure throttling valve is reduced from the first area to a third area, and the first indoor heat exchanger is switched from the evaporation state to a condensation state. The application aims to simplify the system structure and reduce the number of required parts on the basis of realizing dehumidification while reducing temperature drop.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to control methods for air conditioners, air conditioners, and storage media. Background Technology

[0002] With social development and improved living standards, air conditioners have become increasingly diversified in function, especially the integration of cooling, heating and dehumidification functions. Air conditioner dehumidification generally involves condensing the moisture in the air through a low-temperature heat exchanger, which causes the air temperature to drop. Some air conditioners are equipped with temperature-controlled dehumidification functions, which dehumidify the air through a low-temperature heat exchanger while heating the air through a medium- or high-temperature heat exchanger, thereby reducing the drop in air temperature while dehumidifying.

[0003] In related technologies, air conditioners generally use a three-pipe air conditioning system to keep one part of the indoor heat exchanger at a low temperature while another part of the indoor heat exchanger is at a medium or high temperature to meet the requirements of temperature control and dehumidification. However, such systems have problems such as complex piping and numerous parts. Summary of the Invention

[0004] The main objective of this application is to provide a control method for an air conditioner, an air conditioner, and a storage medium, which aims to simplify the system structure and reduce the number of required parts while achieving dehumidification and reducing temperature drop.

[0005] To achieve the above objectives, this application proposes a control method for an air conditioner, the air conditioner comprising a compressor, a commutation assembly, and an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is configured to switch its minimum flow area and / or its operating state based on the pressure difference across its terminals and / or the momentum of the refrigerant flowing through it. The control method for the air conditioner includes: The air conditioner is controlled to operate in a first mode, in which the flow area of ​​the differential pressure throttle valve is a first area and / or the differential pressure across the differential pressure throttle valve is less than or equal to a preset differential pressure and / or the temperature difference across the differential pressure throttle valve is less than or equal to a preset temperature difference, and both the first indoor heat exchanger and the second indoor heat exchanger are in an evaporation state. The throttling device is controlled to increase its opening by adjusting the target opening parameter, so that the flow area of ​​the differential pressure throttling valve is reduced from the first area to the third area and / or the pressure difference across the differential pressure throttling valve is greater than the preset pressure difference and / or the temperature difference across the differential pressure throttling valve is greater than the preset temperature difference, and the first indoor heat exchanger switches from the evaporation state to the condensation state. Wherein, the target opening adjustment parameter is greater than or equal to the minimum opening adjustment parameter, and the minimum opening adjustment parameter is the minimum value of the opening adjustment parameter required for the differential pressure throttle valve to switch the flow area of ​​the differential pressure throttle valve to the third area and / or to make the differential pressure difference across the differential pressure throttle valve greater than the preset differential pressure difference and / or to make the temperature difference across the differential pressure throttle valve greater than the preset temperature difference.

[0006] In one embodiment, the target opening adjustment parameter includes a target adjustment speed, and the minimum opening adjustment parameter includes a minimum adjustment speed; And / or, the target opening adjustment parameter includes the target opening adjustment amplitude, and the minimum opening adjustment parameter includes the minimum opening adjustment amplitude.

[0007] In one embodiment, the throttling device is an electronic expansion valve, the target adjustment speed is a target excitation speed, the minimum adjustment speed includes a minimum excitation speed, and the minimum excitation speed ranges from [20 pulses / second to 50 pulses / second]. And / or, the target opening adjustment amplitude ranges from 30% to 90% of the maximum opening of the throttling device, and the minimum opening adjustment amplitude ranges from 20% to 40% of the maximum opening of the throttling device.

[0008] In one embodiment, the target excitation velocity ranges from [30 pulses / second to 120 pulses / second].

[0009] In one embodiment, the target opening adjustment parameter is less than or equal to the maximum opening adjustment parameter allowed by the throttling device.

[0010] In one embodiment, the target opening adjustment parameter includes a target adjustment speed, and the maximum opening adjustment parameter includes the maximum adjustment speed allowed to protect the throttling device; And / or, the target opening adjustment parameter includes the target opening adjustment amplitude, and the maximum opening adjustment parameter includes the maximum opening adjustment amplitude allowed to protect the throttling device. In one embodiment, the step of controlling the throttling device to increase its opening degree using the target opening degree adjustment parameter includes: The throttling device is controlled to increase its opening to the target opening by adjusting the target opening parameter; Wherein, the target opening degree is greater than or equal to the preset opening degree, and the preset opening degree is the minimum opening degree required for the differential pressure throttle valve to switch the flow area of ​​the differential pressure throttle valve to the first preset area and / or to switch the differential pressure across the differential pressure throttle valve to a value greater than the preset differential pressure and / or to switch the temperature difference across the differential pressure throttle valve to a value greater than the preset temperature difference.

[0011] In one embodiment, the target opening ranges from [50%, 100%] of the maximum opening of the throttling device.

[0012] In one embodiment, the step of controlling the air conditioner to operate in a first mode includes: Controlling the compressor's operating frequency to be within an initial frequency range, or controlling the compressor to decrease its frequency to bring its operating frequency within the initial frequency range, or controlling the compressor to increase its frequency to bring its operating frequency within the initial frequency range, or controlling the compressor to maintain its operating frequency within the initial frequency range; and / or, Controlling the opening degree of the throttling device to be within the initial opening degree range, or controlling the opening degree of the throttling device to decrease so that the opening degree of the throttling device is within the initial opening degree range, or controlling the opening degree of the throttling device to be maintained within the initial opening degree range; and / or, The outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed within the initial speed range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed reduced so that its speed is within the initial speed range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed increased so that its speed is within the initial speed range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed maintained within the initial speed range.

[0013] In one embodiment, the initial frequency range is 20Hz-80Hz; and / or, The initial frequency range is 15%-60% of the compressor's rated frequency; and / or, The initial opening range is 30-100 steps; and / or, The initial opening range is 10%-30% of the maximum opening of the throttling device; and / or, The initial rotational speed range is 50 r / min - 250 r / min; and / or, The initial speed range is 5%-30% of the rated speed of the outdoor fan.

[0014] In one embodiment, after the step of controlling the air conditioner to operate in the first mode, the method further includes: When the preset switching conditions are met, the step of controlling the throttling device to increase the opening degree with the target opening degree adjustment parameter is executed; The preset switching conditions include at least one of the following: The outdoor heat exchanger temperature is greater than or equal to the preset temperature; The air conditioner has completed the initialization process; The duration for which the throttling device operates within the initial opening range is greater than or equal to a first preset duration; The compressor operates at the initial frequency range for a duration greater than or equal to the second preset duration; The duration during which the outdoor fan operates within the initial speed range is greater than or equal to the third preset duration; The air conditioner can increase the pressure difference across the differential pressure throttle valve from a first pressure difference to a set pressure difference, wherein the set pressure difference is greater than the first pressure difference; The discharge pressure of the compressor and / or the pressure on the high-pressure side of the air conditioner are greater than or equal to the preset high pressure. The exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature.

[0015] In one embodiment, the ratio of the third area to the first area is less than or equal to 0.3; and / or, The preset pressure difference is greater than or equal to 0.05 MPa; and / or, The preset temperature difference is greater than or equal to 5℃.

[0016] In one embodiment, the throttling device is an electronic expansion valve, and / or, the control method of the air conditioner further includes: Obtain the operating mode of the air conditioner; When the operating mode is cooling mode or cooling and dehumidification mode, the step of controlling the air conditioner to operate in the first mode is executed; When the operating mode is heating mode, the air conditioner is controlled to operate in heating mode. In the heating mode, the flow area of ​​the differential pressure throttling valve is the second area and / or the pressure difference across the differential pressure throttling valve is less than or equal to the preset pressure difference and / or the temperature difference across the differential pressure throttling valve is less than or equal to the preset temperature difference. The first indoor heat exchanger and the second indoor heat exchanger are both in a condensing state, and the second area is greater than the third area.

[0017] In addition, to achieve the above objectives, this application also proposes an air conditioner, which includes a compressor, a reversing assembly, and an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is configured to switch the minimum flow area of ​​the differential pressure throttling valve and / or the operating state of the differential pressure throttling valve based on the pressure difference across its two ends and / or the momentum of the refrigerant flowing through the differential pressure throttling valve. The operating modes of the air conditioner include: In the first mode, the flow area of ​​the differential pressure throttle valve is a first area and / or the differential pressure difference across the differential pressure throttle valve is less than or equal to a preset differential pressure difference and / or the temperature difference across the differential pressure throttle valve is less than or equal to a preset temperature difference, and both the first indoor heat exchanger and the second indoor heat exchanger are in an evaporation state. In the third mode, the flow area of ​​the differential pressure throttle valve is the third area and / or the pressure difference across the differential pressure throttle valve is greater than the preset pressure difference and / or the temperature difference across the differential pressure throttle valve is greater than the preset temperature difference. The first indoor heat exchanger is in a condensing state, and the second indoor heat exchanger is in an evaporating state. The first area is greater than the third area. The air conditioner can increase its opening degree by adjusting parameters at a target opening degree through the throttling device, so that the air conditioner can switch from the first mode to the third mode.

[0018] In one embodiment, the throttling device is an electronic expansion valve, and the target opening adjustment parameter includes a target excitation speed, the target excitation speed being greater than or equal to the minimum excitation speed, and the minimum excitation speed being in the range of [20 pulses / second, 50 pulses / second].

[0019] In one embodiment, the target excitation velocity ranges from [30 pulses / second to 120 pulses / second].

[0020] In one embodiment, the air conditioner can switch from the first mode to the third mode by first reducing the operating frequency of the compressor, or increasing the operating frequency of the compressor, or maintaining the operating frequency of the compressor within an initial frequency range and / or reducing the opening of the throttling device, or maintaining the opening of the throttling device within an initial opening range and / or reducing the speed of the outdoor fan, or increasing the speed of the outdoor fan, or maintaining the speed of the outdoor fan within an initial speed range, and then increasing the opening of the throttling device with the target opening adjustment parameter.

[0021] In addition, to achieve the above objectives, this application also proposes an air conditioner, which includes a control device, a compressor, a reversing assembly, and an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is configured to switch the minimum flow area of ​​the differential pressure throttling valve and / or the operating state of the differential pressure throttling valve based on the pressure difference across its two ends and / or the momentum of the refrigerant flowing through the differential pressure throttling valve. The compressor, the commutation assembly, and the throttling device are all connected to the control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the air conditioner as described above.

[0022] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the air conditioner control method described above.

[0023] One or more technical solutions proposed in this application have at least the following technical effects: An outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger are sequentially connected in an air conditioner. The differential pressure throttling valve can automatically switch the minimum flow area and / or the operating state of the differential pressure throttling valve based on the pressure difference across its two ends and / or the momentum of the refrigerant flowing through the valve. Based on this, in the first mode, both the first and second indoor heat exchangers are in an evaporation state, which can achieve indoor dehumidification and cooling. In this state, the throttling device is controlled to increase its opening by adjusting the target opening parameter, which can achieve the desired effect across the differential pressure throttling valve. The pressure difference increases to above the preset pressure difference and increases the momentum of the refrigerant flowing through the pressure difference throttle valve, ensuring that the refrigerant can drive the valve core of the pressure difference throttle valve to move. The increased pressure difference across the pressure difference throttle valve reduces the flow area and / or switches the operating state. The temperature of the first indoor heat exchanger can be increased to heat the air, while the second indoor heat exchanger maintains a low temperature to dehumidify the air. This allows the two-pipe air conditioning system to achieve dehumidification while reducing temperature drop. Compared to a three-pipe system, it reduces the number of components required for the installation of medium-pressure gas pipes and pipe connections between the indoor heat exchanger and the outdoor unit, thereby simplifying the system structure and reducing the number of required parts while achieving dehumidification and reducing temperature drop. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the refrigerant system structure of an embodiment of the air conditioner of this application; Figure 2 This is a schematic diagram of the structure of a differential pressure throttling valve in an air conditioner according to this application; Figure 3 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the control method of the air conditioner in this application embodiment; Figure 4 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to this application. Figure 5 This is a flowchart illustrating the second embodiment of the control method for the air conditioner in this application.

[0027] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0029] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0030] The main solution of this application embodiment is: a control method based on an air conditioner, the air conditioner including a compressor, a reversing assembly, and an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is configured to switch its minimum flow area and / or its operating state based on the pressure difference across its two ends and / or the momentum of the refrigerant flowing through the differential pressure throttling valve. The control method of the air conditioner includes: controlling the air conditioner to operate in a first mode, in which the flow area of ​​the differential pressure throttling valve is a first area, and / or the pressure difference across the differential pressure throttling valve is less than or equal to a preset pressure difference and / or the temperature difference across the differential pressure throttling valve is less than or equal to a preset temperature difference, and the first indoor heat exchanger and The second indoor heat exchanger is in an evaporation state. The throttling device is controlled to increase its opening by a target opening adjustment parameter, so that the flow area of ​​the differential pressure throttling valve decreases from the first area to the third area and / or the pressure difference across the differential pressure throttling valve is greater than the preset pressure difference and / or the temperature difference across the differential pressure throttling valve is greater than the preset temperature difference, and the first indoor heat exchanger switches from an evaporation state to a condensation state. The target opening adjustment parameter is greater than or equal to the minimum opening adjustment parameter, which is the minimum value of the opening adjustment parameter required for the differential pressure throttling valve to switch its flow area to the third area and / or to make the pressure difference across the differential pressure throttling valve greater than the preset pressure difference and / or to make the temperature difference across the differential pressure throttling valve greater than the preset temperature difference.

[0031] In this embodiment, for ease of description, the following description uses an air conditioner as the subject of execution.

[0032] In related technologies, air conditioners generally use a three-pipe air conditioning system to keep one part of the indoor heat exchanger at a low temperature while another part of the indoor heat exchanger is at a medium or high temperature to meet the requirements of temperature control and dehumidification. However, such systems have problems such as complex piping and numerous parts.

[0033] This application provides the above-mentioned solution, which includes an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence in an air conditioner. The differential pressure throttling valve can automatically switch the minimum flow area and / or the operating state of the differential pressure throttling valve based on the pressure difference across its two ends and / or the momentum of the refrigerant flowing through the valve. Based on this, in the first mode, both the first and second indoor heat exchangers are in an evaporation state, achieving indoor dehumidification and cooling. In this state, the throttling device is controlled to increase its opening by adjusting the target opening parameter, thereby increasing the pressure difference across the differential pressure throttling valve to a preset pressure. A pressure difference greater than 10°C increases the momentum of the refrigerant flowing through the differential pressure throttle valve, ensuring that the refrigerant can drive the valve core of the differential pressure throttle valve to move. At the same time, the increased pressure difference across the differential pressure throttle valve reduces the flow area and / or switches the operating state. The temperature of the first indoor heat exchanger can be increased to heat the air, while the second indoor heat exchanger maintains a low temperature to dehumidify the air. This allows the two-pipe air conditioning system to achieve dehumidification while reducing temperature drop. Compared to a three-pipe system, it reduces the number of components required for the installation of medium-pressure gas pipes and pipe connections between the indoor heat exchanger and the outdoor unit, thereby simplifying the system structure and reducing the number of required parts while achieving dehumidification and reducing temperature drop.

[0034] This application provides an air conditioner. The air conditioner can be any type of air conditioner, such as a wall-mounted air conditioner, a floor-standing air conditioner, a window air conditioner, a ceiling-mounted air conditioner, or a multi-split air conditioner.

[0035] In this embodiment, refer to Figure 1 and Figure 3 The air conditioner includes a compressor 1, a reversing assembly 2, and an outdoor heat exchanger 3, a throttling device 4, a first indoor heat exchanger 5, a differential pressure throttling valve 6, and a second indoor heat exchanger 7 connected in sequence. The exhaust port of the compressor 1, the return port of the compressor 1, the outdoor heat exchanger 3, and the second indoor heat exchanger 7 are all connected to the reversing assembly 2. The differential pressure throttling valve 6 is configured to switch the minimum flow area and / or the operating state of the differential pressure throttling valve 6 based on the refrigerant pressure difference across the valve and / or the momentum of the refrigerant flowing through it in a first refrigerant flow direction and / or a second refrigerant flow direction. The first refrigerant flow direction is from the outdoor heat exchanger 3 to the second indoor heat exchanger 7, and the second refrigerant flow direction is from the second indoor heat exchanger 7 to the outdoor heat exchanger 3. In this embodiment, the flow area of ​​the differential pressure throttling valve 6 can be understood as the minimum flow area of ​​the differential pressure throttling valve 6. In the embodiments of this application, the refrigerant pressure difference across the differential pressure throttle valve 6 and the pressure difference across the differential pressure throttle valve 6 are the same concept.

[0036] In the first refrigerant flow direction and / or the second refrigerant flow direction, when the refrigerant pressure difference across the differential pressure throttle valve 6 is greater than the preset differential pressure difference, one of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can be in a condensing state and the other of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can be in an evaporating state; when the refrigerant pressure difference across the differential pressure throttle valve 6 is less than or equal to the preset differential pressure difference, both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can be in a condensing state or an evaporating state.

[0037] An outdoor fan 31 is provided for the outdoor heat exchanger 3, and an indoor fan 8 is provided for the first indoor heat exchanger 5 and the second indoor heat exchanger 7. In this embodiment, one indoor fan 8 is provided for each of the first indoor heat exchanger 5 and the second indoor heat exchanger 7. In other implementations, different fans are provided for the first indoor heat exchanger 5 and the second indoor heat exchanger 7.

[0038] In one feasible implementation, the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are located in the same indoor air duct. In the indoor air duct, the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can be arranged along the airflow direction driven by the indoor fan 8. Then, the air driven by the indoor fan 8 can pass through the first indoor heat exchanger 5 and the second indoor heat exchanger 7 in sequence to exchange heat. The air can pass through the first indoor heat exchanger 5 first and then the second indoor heat exchanger 7, or the air can pass through the second indoor heat exchanger 7 first and then the first indoor heat exchanger 5. In some implementations, the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are located in the same indoor air duct. The direction in which the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are arranged can be at an angle to the reference direction (e.g., vertically arranged, etc.). Part of the air entering the indoor air duct exchanges heat with the first indoor heat exchanger 5, and the other part exchanges heat with the second indoor heat exchanger 7. The air after heat exchange is mixed in the indoor air duct (e.g., in the indoor fan 8, etc.) and then sent into the indoor space.

[0039] In another feasible implementation, the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can also be installed in different indoor air ducts, so that the indoor air can exchange heat with the first indoor heat exchanger 5 and the second indoor heat exchanger 7 respectively and then be sent into the indoor space from different air outlets and mixed in the indoor space.

[0040] The reversing assembly 2 is configured to switch the refrigerant flow direction between the outdoor heat exchanger 3 and the second indoor heat exchanger 7. In this embodiment, the reversing assembly 2 is a four-way valve. In other implementations, the reversing assembly 2 may also include more than one solenoid valve, or a combination of a multi-way valve and a solenoid valve, or a combination of a solenoid valve and a single-way valve, etc. The operating states of the reversing assembly 2 include a first state and a second state. When the reversing assembly 2 is operating in the first state, the refrigerant discharged from the compressor 1 flows sequentially through the outdoor heat exchanger 3, the throttling device 4, the first indoor heat exchanger 5, the differential pressure throttling valve 6, and the second indoor heat exchanger 7 before returning to the compressor 1. When the reversing assembly 2 is operating in the second state, the refrigerant discharged from the compressor 1 flows sequentially through the second indoor heat exchanger 7, the differential pressure throttling valve 6, the first indoor heat exchanger 5, the throttling device 4, and the outdoor heat exchanger 3 before returning to the compressor 1.

[0041] In this embodiment, the throttling device 4 is a device with a switchable throttling opening. In other implementations, the throttling device 4 may also be a device with a fixed opening. The throttling device 4 includes one or more of the following: an electronic expansion valve, a throttling valve core 64, a capillary tube, and a thermostatic expansion valve.

[0042] In this embodiment, the throttling device 4 is configured to switch between at least a throttling opening and a target opening, where the throttling opening is less than the target opening. The target opening is [50% or 100%] of the maximum opening of the throttling device 4. For example, the maximum opening is A, and the target opening is 60%A, 70%A, 80%A, 90%A, etc. In this embodiment, the target opening can be the maximum opening.

[0043] In this embodiment, the target opening range is [450 steps, 500 steps], and can be 450 steps, 460 steps, 470 steps, 480 steps, 490 steps or 500 steps, etc.

[0044] In one implementation, the throttling device 4 is an electronic expansion valve, which controls the throttling opening between the target opening and other openings, or even switches to other openings according to actual usage requirements.

[0045] In another implementation, the throttling device 4 may also include a throttling component (e.g., a capillary tube), a bypass pipe, and a switching element. The flow area of ​​the bypass pipe is larger than that of the throttling component, and the switching element can be configured to switch the refrigerant flow path between the throttling component and the bypass pipe. When the switching element operates in a first state, the refrigerant flows through the throttling component but not through the bypass pipe. At this time, the flow area of ​​the throttling device 4 is in a first working state, for example, at the throttling opening. When the switching element operates in a second state, the refrigerant flows through the bypass pipe but not through the throttling component. At this time, the flow area of ​​the throttling device 4 is in a second working state, for example, at the maximum opening, in a fully open state. The switching element includes a three-way valve, or it includes a first solenoid valve connected to the throttling component and a second solenoid valve located in the bypass pipe. Based on this, by switching the operating state through the switching element, the throttling device 4 can switch between the throttling opening and the target opening.

[0046] The minimum flow area of ​​the differential pressure throttle valve 6 can adaptively change with the pressure difference across its two ends without the need for external control signal drive.

[0047] The differential pressure throttle valve 6 is configured to switch between a first flow area and a second flow area and / or between a first operating state and a second operating state based on the refrigerant pressure difference across its two ends in a preset refrigerant flow direction. The first flow area is smaller than the second flow area. The differential pressure throttle valve 6 has a first end 601 and a second end 602. In the preset refrigerant flow direction, the refrigerant flows from the first end 601 to the second end 602, and the refrigerant pressure difference is the difference between the refrigerant pressure at the first end 601 and the refrigerant pressure at the second end 602. When the refrigerant pressure difference is greater than the preset pressure difference, the minimum flow area of ​​the differential pressure throttle valve 6 is the first flow area, and the differential pressure throttle valve 6 is in the first operating state, a strong throttling state. When the refrigerant pressure difference across the differential pressure throttle valve 6 is less than or equal to the preset pressure difference, the minimum flow area of ​​the differential pressure throttle valve 6 is the second flow area, and the differential pressure throttle valve 6 is in the second operating state, a weak throttling state or a basically non-throttling state.

[0048] In this embodiment, the preset pressure difference is greater than or equal to 0.05 MPa, for example, it can be 0.06 MPa, 0.08 MPa, 0.1 MPa, 0.2 MPa, 0.4 MPa, 0.5 MPa, 0.8 MPa, etc. In this embodiment, the preset pressure difference is greater than or equal to 0.1 MPa.

[0049] The first circulation area is smaller than the second circulation area, and the ratio of the first circulation area to the second circulation area is less than or equal to 0.3, for example, it can be 0.1, 0.2, 0.3, etc.

[0050] The differential pressure throttle valve 6 can be a one-way differential pressure throttle valve or a two-way differential pressure throttle valve. The differential pressure throttle valve 6 can consist of one valve structure or two valve structures. For example, the differential pressure throttle valve 6 can consist of a capillary tube and a differential pressure one-way valve connected in parallel.

[0051] When the differential pressure throttle valve 6 is a one-way differential pressure throttle valve, the preset refrigerant flow direction is either the first refrigerant flow direction or the second refrigerant flow direction. The differential pressure throttle valve 6 can be configured to switch between a first flow area and a second flow area based on the refrigerant pressure difference across the valve 6 within the preset refrigerant flow direction, and / or switch between a first operating state and a second operating state. If the refrigerant flow direction of the differential pressure throttle valve 6 differs from the preset refrigerant flow direction (refrigerant flow direction is opposite or refrigerant flow stops), the minimum flow area of ​​the differential pressure throttle valve 6 can be a third flow area and / or the valve 6 can be in a third operating state. The second refrigerant flow direction is opposite to the first refrigerant flow direction.

[0052] When the differential pressure throttle valve 6 is a bidirectional differential pressure throttle valve, the preset refrigerant flow direction includes a first refrigerant flow direction and a second refrigerant flow direction. The differential pressure throttle valve 6 can also be configured to switch between a first flow area and a second flow area and / or between a first operating state and a second operating state based on the refrigerant pressure difference across the valve in the first refrigerant flow direction. In the second refrigerant flow direction, it can switch between a first flow area and a second flow area and / or between a first operating state and a second operating state based on the refrigerant pressure difference across the valve. The second refrigerant flow direction is opposite to the first refrigerant flow direction. In the second refrigerant flow direction, the refrigerant flows from the second end 602 to the first end 601, and the refrigerant pressure difference is the difference between the refrigerant pressure at the second end 602 and the refrigerant pressure at the first end 601. In the first refrigerant flow direction, the refrigerant flows from the first end 601 to the second end 602, and the refrigerant pressure difference is the difference between the refrigerant pressure at the first end 601 and the refrigerant pressure at the second end 602. When the refrigerant pressure difference is greater than the preset pressure difference, the minimum flow area of ​​the differential pressure throttle valve 6 is the first flow area. At this time, the differential pressure throttle valve 6 is in the first working state, which is a strong throttling state. When the refrigerant pressure difference across the differential pressure throttle valve 6 is less than or equal to the preset pressure difference, the minimum flow area of ​​the differential pressure throttle valve 6 is the second flow area. At this time, the differential pressure throttle valve 6 is in the second working state, which is a weak throttling state or a basically non-throttling state.

[0053] When compressor 1 is in the on state, and differential pressure throttle valve 6 is in the first flow area and / or differential pressure throttle valve 6 is in the first working state, one of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 is in the condensing state, and the other of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 is in the evaporating state. In the first working state, the refrigerant pressure difference across differential pressure throttle valve 6 is greater than the preset pressure difference and / or the temperature difference across differential pressure throttle valve 6 is greater than the preset temperature difference.

[0054] When compressor 1 is in the on state, and differential pressure throttle valve 6 is in the second flow area and / or differential pressure throttle valve 6 is in the second working state, both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are in the condensing state or the evaporating state. In the second working state, the refrigerant pressure difference across differential pressure throttle valve 6 is less than or equal to the preset pressure difference and / or the temperature difference across differential pressure throttle valve 6 is less than or equal to the preset temperature difference.

[0055] When compressor 1 is in the on or off state, differential pressure throttle valve 6 is in the third flow area and / or in the third operating state. In the third operating state, the refrigerant pressure difference across differential pressure throttle valve 6 is less than or equal to the preset pressure difference and / or the temperature difference across differential pressure throttle valve 6 is less than or equal to the preset temperature difference. When compressor 1 is on, both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are in the condensation or evaporation state.

[0056] The switching of the minimum flow area of ​​the differential pressure throttle valve 6 between different flow areas and / or the switching of the differential pressure throttle valve 6 between different operating states can be achieved by the state changes of components in the air conditioner: compressor 1 is turned on or off, compressor 1 adjusts its operating frequency, outdoor fan 31 adjusts its operating speed, indoor fan 8 adjusts its operating speed, throttling device 4 adjusts its opening degree, reversing assembly 2 switches its operating state, pressure regulating components, etc.

[0057] With compressor 1 running, the air conditioner can operate in at least the following modes through the cooperation of differential pressure throttling valve 6, throttling device 4, and reversing assembly 2: The first mode, combined Figure 1 (b) and Figure 2 (a) Both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are in an evaporation state. In the first mode, the compressor 1 is in the on state, the reversing assembly 2 operates in the first state, the throttling device 4 operates at the throttling opening, the minimum flow area of ​​the differential pressure throttling valve 6 is the first area and / or the differential pressure throttling valve 6 is in the second operating state, the outdoor heat exchanger 3 is in a condensation state, and both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are in an evaporation state. The first mode may include a cooling mode or a cooling and dehumidification mode, etc.

[0058] The second mode, combined with Figure 1 (c) and Figure 2 (c) Both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are in a condensing state. In the second mode, the compressor 1 is in the on state, the reversing assembly 2 operates in the second state, the throttling device 4 operates at the throttling opening, the minimum flow area of ​​the differential pressure throttling valve 6 is the second area and / or the differential pressure throttling valve 6 is in the second operating state, the outdoor heat exchanger 3 is in the evaporating state, and both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 are in a condensing state. The second mode may include a heating mode, etc.

[0059] The third mode, combined with Figure 1 (a) and Figure 2 (b) One of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 is in an evaporating state, and the other of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 is in a condensing state. The third mode can be a constant temperature dehumidification mode, in which the heat exchanger in the evaporating state of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can dehumidify the air, and the heat exchanger in the condensing state of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can heat the air. In one implementation of the third mode, compressor 1 is in the on state, reversing assembly 2 operates in the first state, throttling device 4 operates at the target opening, the minimum flow area of ​​differential pressure throttling valve 6 is the third area and / or differential pressure throttling valve 6 is in the first working state, outdoor heat exchanger 3 and first indoor heat exchanger 5 are both in the condensing state, and second indoor heat exchanger 7 is in the evaporating state. The target opening is greater than the throttling opening in the first mode. In another implementation of the third mode, compressor 1 is in the on state, reversing assembly 2 operates in the second state, throttling device 4 operates at the target opening, the minimum flow area of ​​differential pressure throttling valve 6 is the third area and / or differential pressure throttling valve 6 is in the first working state, second indoor heat exchanger 7 is in the condensing state, and outdoor heat exchanger 3 and first indoor heat exchanger 5 are both in the evaporating state. The target opening is greater than the throttling opening in the second mode.

[0060] Both the first area and the second area are larger than the third area. In this embodiment, the differential pressure throttle valve 6 is in a second working state (e.g., fully open state) when the minimum flow area is the first area, in a second working state (e.g., fully open state) when the minimum flow area is the second area, and in a first working state (strong throttling state) when the minimum flow area is the third area.

[0061] The third area is the first circulation area, and the first area and / or the second area is the second circulation area.

[0062] In the first or second mode, the pressure difference across the differential pressure throttle valve 6 is less than or equal to the preset pressure difference, and the temperature difference across the differential pressure throttle valve 6 is less than or equal to the preset temperature difference; in the third mode, the pressure difference across the differential pressure throttle valve 6 is greater than the preset pressure difference, and the temperature difference across the differential pressure throttle valve 6 is greater than the preset temperature difference.

[0063] When the refrigerant flow direction is the same in the first mode and the third mode (that is, the operating state of the reversing assembly 2 is the same), the pressure difference state across the switchable differential pressure throttle valve 6 is adjusted by the operating parameters of at least one component in the air conditioner, causing the minimum flow area of ​​the differential pressure throttle valve 6 to switch between the first area and the third area and / or the differential pressure throttle valve 6 to switch between the first operating state and the second operating state, thereby enabling the air conditioner to switch between the first mode and the third mode. When the refrigerant flow direction is the same in the second mode and the third mode (that is, the operating state of the reversing assembly 2 is the same), the pressure difference state across the switchable differential pressure throttle valve 6 is adjusted by the operating parameters of at least one component in the air conditioner, causing the minimum flow area of ​​the differential pressure throttle valve 6 to switch between the second area and the third area and / or the differential pressure throttle valve 6 to switch between the first operating state and the second operating state, thereby enabling the air conditioner to switch between the second mode and the third mode. At least one component may be at least one of the following: compressor 1, throttling device 4, indoor fan 8, outdoor fan 31, reversing assembly 2, other pressure regulating components, etc.

[0064] In the first, second, or third mode, based on the limitations of component selection or the needs of actual operating conditions, the throttling device 4 can operate at a fixed or variable opening degree, the outdoor fan 31 can operate at a fixed or variable speed, and the compressor 1 can operate at a fixed or variable frequency.

[0065] In the cooling and dehumidification mode, both the first indoor heat exchanger 5 and the second indoor heat exchanger 7 cool and dehumidify the air. In the constant temperature dehumidification mode, the first indoor heat exchanger 5 heats the air, and the second indoor heat exchanger 7 cools and dehumidifies the air. Under the same air conditions in the indoor space, the temperature drop after heat exchange between the air in the cooling and dehumidification mode and the first and second indoor heat exchangers 5 and 7 is greater than that in the constant temperature dehumidification mode. Similarly, the humidity drop after heat exchange between the air in the cooling and dehumidification mode and the first and second indoor heat exchangers 5 and 7 is greater than that in the constant temperature dehumidification mode. In the constant temperature dehumidification mode, the temperature change of the indoor air after heat exchange with the first indoor heat exchanger 5 and the second indoor heat exchanger 7 is less than the preset value. In other words, the temperature drop, the unchanged temperature, or the slight increase in temperature after heat exchange with the first indoor heat exchanger 5 and the second indoor heat exchanger 7 is very small. Specifically, the temperature drop is the difference between the air temperature before and after heat exchange, and the humidity drop is the difference between the air humidity before and after heat exchange.

[0066] The technical solution of this invention employs a differential pressure throttling valve 6 in a two-pipe air conditioner. The differential pressure throttling valve 6 can automatically switch its minimum flow area and / or operating state based on the refrigerant pressure difference across its two ends and / or the momentum of the refrigerant flowing through it. When the minimum flow area of ​​the differential pressure throttling valve 6 is a larger second flow area and / or in a second operating state, the first indoor heat exchanger 5 and the second indoor heat exchanger 7 can simultaneously heat or cool and dehumidify the indoor air. When the minimum flow area of ​​the differential pressure throttling valve 6 is a smaller first flow area and / or in a first operating state, one of the first indoor heat exchanger 5 and the second indoor heat exchanger 7 is in a condensing state to heat the air while the other is in an evaporating state to dehumidify the air. Based on this, the two-pipe air conditioner can achieve cooling, dehumidification, and heating, as well as dehumidification while maintaining a stable temperature. Compared to a three-pipe air conditioner, it reduces the number of components required for the installation and connection of the medium-pressure gas pipe between the indoor heat exchanger and the outdoor unit, thereby achieving constant temperature dehumidification while simplifying the system structure and reducing the number of required parts. In addition, a differential pressure throttle valve 6 is used instead of an electronic expansion valve between the first indoor heat exchanger 5 and the second indoor heat exchanger 7. The differential pressure throttle valve 6 controls the flow area by the pressure difference between its two ends. Therefore, the differential pressure throttle valve 6 does not need to be equipped with electrical control components and cables to drive the movement of the throttle valve, which reduces the space occupied by the differential pressure throttle valve 6 and facilitates its installation and layout.

[0067] In the first embodiment of the differential pressure throttle valve 6, the differential pressure throttle valve 6 is a one-way differential pressure throttle valve, combined with Figure 2 , Figure 2 The dashed arrow indicates the flow trajectory of the refrigerant in the flow channel within the valve. The differential pressure throttle valve 6 has a first end 601 and a second end 602. The differential pressure throttle valve 6 is configured as follows: like Figure 2 (b) When the refrigerant flows from the first end 601 to the second end 602 and the refrigerant pressure difference between the first end 601 and the second end 602 is greater than the preset pressure difference, the minimum flow area of ​​the differential pressure throttle valve 6 is the first flow area and / or the differential pressure throttle valve 6 is in the first working state. like Figure 2 (a) When the refrigerant flows from the first end 601 to the second end 602 and the refrigerant pressure difference between the first end 601 and the second end 602 is less than or equal to the preset pressure difference, the minimum flow area of ​​the differential pressure throttle valve 6 is the second flow area and / or the differential pressure throttle valve 6 is in the second working state. like Figure 2 (c) When the refrigerant flows from the second end 602 to the first end 601, the minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area and / or the differential pressure throttle valve 6 is in the third working state. When the refrigerant stops flowing, the minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area and / or the differential pressure throttle valve 6 is in the third working state.

[0068] Both the refrigerant pressure differential and the preset pressure differential are positive values ​​here.

[0069] In the third operating state, the differential pressure throttle valve 6 is in a weak throttling state or a basically non-throttling state. The second and third operating states may be the same or different.

[0070] In this embodiment, both the second and third flow areas are the maximum flow areas of the differential pressure throttle valve 6.

[0071] The first circulation area is smaller than the third circulation area, and the ratio of the first circulation area to the third circulation area is less than or equal to 0.3, for example, it can be 0.1, 0.2, 0.3, etc.

[0072] When the minimum flow area of ​​the differential pressure throttle valve 6 is the first flow area, it is in the first working state; when the minimum flow area of ​​the differential pressure throttle valve 6 is the second or third flow area, it is in the second working state.

[0073] In this embodiment, when the refrigerant pressure difference across the differential pressure throttle valve 6 is greater than a preset pressure difference, the temperature difference across the differential pressure throttle valve 6 is also greater than a preset temperature difference. Conversely, when the refrigerant pressure difference across the differential pressure throttle valve 6 is less than or equal to the preset pressure difference, the temperature difference across the differential pressure throttle valve 6 is less than or equal to the preset temperature difference. The preset temperature difference is greater than or equal to 5°C, and for example, it can be 6°C, 8°C, 10°C, 15°C, etc.

[0074] In this embodiment, the differential pressure throttle valve 6 includes a housing 61, a fixed seat 62 disposed within the housing 61, an elastic element 63, a valve core 64, and a valve seat 65. The housing 61 has a first interface at the first end 601 of the differential pressure throttle valve 6 and a second interface at the second end 602 of the differential pressure throttle valve 6. One end of the elastic element 63 is connected to the fixed seat 62, and the other end of the elastic element 63 is connected to the valve core 64. A flow channel for refrigerant to flow is provided between the fixed seat 62, the elastic element 63, the valve core 64, and the valve seat 65. Both the first interface and the second interface are connected to the flow channel. The valve seat 65 is provided with a valve port 651, and the valve core 64 passes through the valve port 651. The minimum cross-sectional area of ​​the valve port 651 through which the refrigerant passes is the minimum flow area of ​​the differential pressure throttle valve 6. When the valve core 64 moves to different positions in the valve port 651, the differential pressure throttle valve 6 has different minimum flow areas. In this embodiment, the valve core 64 is configured to switch between a first position and a second position to cooperate with the valve port 651 to realize the differential pressure throttling valve 6 switching at least between a first flow area and a second flow area and / or between a first operating state and a second operating state: Combination Figure 2(c) When the refrigerant flows from the second end 602 of the differential pressure throttle valve 6 to the first end 601 of the differential pressure throttle valve 6, the valve core 64 is located in the first position under the action of the pre-tightening force of the elastic element 63 and the driving force of the refrigerant. At this time, the minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area, and the differential pressure throttle valve 6 is in the third working state. When the valve core 64 is in the first position, it abuts against the valve seat 65, and the valve seat 65 limits and fixes the valve core 64 in the first position. Combination Figure 2 (b) When the refrigerant flows from the first end 601 of the differential pressure throttle valve 6 to the second end 602 of the differential pressure throttle valve 6, the valve core 64 can be pushed toward the second position when the refrigerant's pushing force is greater than the elastic force of the elastic element 63. When the valve core 64 moves to the second position, it abuts against the fixed seat 62. The fixed seat 62 limits and fixes the valve core 64 to the second position. When the valve core 64 is in the second position, it compresses the elastic element 63. At this time, the elastic force generated by the elastic element 63 is defined as the reference force. When the refrigerant's pushing force is greater than the reference force, the valve core 64 remains in the second position. When the valve core 64 is in the second position, the minimum flow area of ​​the differential pressure throttle valve 6 is the first flow area, and the working state of the differential pressure throttle valve 6 is the first working state. Combination Figure 2 (a) When the refrigerant flows from the first end 601 of the differential pressure throttle valve 6 to the second end 602 of the differential pressure throttle valve 6, the valve core 64 is located in the first position or in the middle position between the first position and the second position when the driving force of the refrigerant is less than or equal to the reference force. At this time, the minimum flow area of ​​the differential pressure throttle valve 6 is the second flow area, and the working state of the differential pressure throttle valve 6 is the second working state. When the refrigerant stops flowing, the valve core 64 is in the first position under the preload of the elastic element 63. At this time, the minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area, and the operating state of the differential pressure throttle valve 6 is the third operating state. In this first position, the valve core 64 abuts against the valve seat 65, which limits and fixes the valve core 64 in the first position. The third flow area here is the same as the second flow area mentioned above. In other implementations, when the refrigerant stops flowing, the valve core 64 can also be in the third position. In this case, the minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area, and the operating state of the differential pressure throttle valve 6 is the third operating state. The third flow area can be different from the second flow area, and the second and third operating states can be different operating states.

[0075] Here, the refrigerant driving force is generated based on the refrigerant pressure difference across the differential pressure throttle valve 6. The reference force corresponds to the aforementioned preset pressure difference. Based on the adjustment of the refrigerant flow direction and the refrigerant pressure difference across the differential pressure throttle valve 6 by the components in the air conditioner, the minimum flow area of ​​the differential pressure throttle valve 6 can be automatically switched between the aforementioned first flow area, second flow area, and third flow area, and / or the working state of the differential pressure throttle valve 6 can be automatically switched between the aforementioned first working state and second working state.

[0076] In one application of a one-way differential pressure throttle valve, combined with Figure 1 and Figure 2 The differential pressure throttling valve 6 is configured to switch the minimum flow area and / or operating state based on the refrigerant pressure difference at both ends in the first refrigerant flow direction. The first indoor heat exchanger 5 is connected to the first end 601, and the second end 602 is connected to the second indoor heat exchanger 7. In the first mode and the third mode, the refrigerant flow direction is the first refrigerant flow direction, and in the second mode, the refrigerant flow direction is the second refrigerant flow direction. Then: The refrigerant flows from the outdoor heat exchanger 3 to the second indoor heat exchanger 7, that is, from the first end 601 to the second end 602. When the refrigerant pressure difference between the first end 601 and the second end 602 is greater than the preset pressure difference, the minimum flow area of ​​the pressure difference throttle valve 6 is the first flow area, that is, the aforementioned third area, and / or the pressure difference throttle valve 6 is in the first working state, and the air conditioner is in the third mode. In the third mode, the first indoor heat exchanger 5 is in the condensing state and the second indoor heat exchanger 7 is in the evaporating state. The refrigerant flows from the outdoor heat exchanger 3 to the second indoor heat exchanger 7, that is, from the first end 601 to the second end 602. When the refrigerant pressure difference between the first end 601 and the second end 602 is less than or equal to the preset pressure difference, the minimum flow area of ​​the pressure difference throttle valve 6 is the second flow area, that is, the first area mentioned above, and / or the pressure difference throttle valve 6 is in the second working state, and the air conditioner is in the first mode. The refrigerant flows from the second indoor heat exchanger 7 to the outdoor heat exchanger 3, that is, from the second end 602 to the first end 601. The minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area mentioned above, that is, the second area mentioned above, and / or the differential pressure throttle valve 6 is in the third working state, and the air conditioner is in the second mode. When the refrigerant stops flowing, the minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area mentioned above and / or the differential pressure throttle valve 6 is in the third working state.

[0077] Based on this, when the refrigerant flows from the outdoor heat exchanger 3 to the second indoor heat exchanger 7, the pressure difference across the differential pressure throttle valve 6 can be adjusted by the components in the air conditioner, thereby enabling the flow area to switch between the first area and the third area and / or between the first working state and the second working state, and thus the air conditioner can switch between the first mode and the third mode. The refrigerant pressure differential across the differential pressure throttling valve 6 can be increased by at least one of the following methods when the minimum flow area of ​​the differential pressure throttling valve 6 is switched from the first area to the third area and / or from the second operating state to the first operating state: the compressor 1 increases its frequency, the outdoor fan 31 decreases its speed, the throttling device 4 increases its opening, etc., wherein increasing the frequency of the compressor 1 may include switching the compressor 1 from the closed state to the open state or increasing the frequency when the compressor 1 is kept on; the refrigerant pressure differential across the differential pressure throttling valve 6 can be decreased by at least one of the following methods when the minimum flow area of ​​the differential pressure throttling valve 6 is switched from the third area to the first area and / or from the first operating state to the second operating state: the compressor 1 decreases its frequency, the outdoor fan 31 increases its speed, the throttling device 4 decreases its opening, etc., wherein decreasing the frequency of the compressor 1 may include switching the compressor 1 from the open state to the closed state or decreasing the frequency when the compressor 1 is kept on.

[0078] The air conditioner switches between a first mode and a third mode. When the temperature meets the cooling requirement but the humidity does not meet the dehumidification requirement during the operation of the first mode, it can switch to the third mode. When the temperature does not meet the cooling requirement during the operation of the third mode, it can switch back to the first mode. Based on this, the cooling and dehumidification requirements of the indoor environment can be effectively balanced to improve indoor comfort.

[0079] In another application of the one-way differential pressure throttle valve, the differential pressure throttle valve 6 is configured to switch the minimum flow area and / or operating state based on the refrigerant pressure difference at both ends in the second refrigerant flow direction. The second indoor heat exchanger 7 is connected to the first end 601, and the first indoor heat exchanger 5 is connected to the second end 602. In the second mode and the third mode, the refrigerant flow direction is the second refrigerant flow direction, and in the first mode, the refrigerant flow direction is the first refrigerant flow direction. Then: The refrigerant flows from the second indoor heat exchanger 7 to the outdoor heat exchanger 3, that is, from the first end 601 to the second end 602. When the refrigerant pressure difference between the first end 601 and the second end 602 is greater than the preset pressure difference, the minimum flow area of ​​the pressure difference throttle valve 6 is the first flow area, that is, the aforementioned third area, and / or the pressure difference throttle valve 6 is in the first working state, and the air conditioner is in the third mode. In the third mode, the first indoor heat exchanger 5 is in the evaporation state and the second indoor heat exchanger 7 is in the condensation state. The refrigerant flows from the second indoor heat exchanger 7 to the outdoor heat exchanger 3, that is, from the first end 601 to the second end 602. When the refrigerant pressure difference between the first end 601 and the second end 602 is less than or equal to the preset pressure difference, the minimum flow area of ​​the pressure difference throttle valve 6 is the second flow area, that is, the second area mentioned above, and / or the pressure difference throttle valve 6 is in the second working state, and the air conditioner is in the second mode. The refrigerant flows from the outdoor heat exchanger 3 to the second indoor heat exchanger 7, that is, from the second end 602 to the first end 601. The minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area mentioned above, that is, the first area mentioned above, and / or the differential pressure throttle valve 6 is in the third working state, and the air conditioner is in the first mode. When the refrigerant stops flowing, the minimum flow area of ​​the differential pressure throttle valve 6 is the third flow area mentioned above.

[0080] Based on this, when the refrigerant flows from the outdoor heat exchanger 3 to the second indoor heat exchanger 7, the flow area can be switched between the second and third areas and / or between the first and second operating states by adjusting the pressure difference across the differential pressure throttle valve 6 through components in the air conditioner, thereby enabling the air conditioner to switch between the second and third modes. The minimum flow area of ​​the differential pressure throttle valve 6 can be adjusted between the second and third areas and / or between the first and second operating states by regulating the refrigerant pressure difference across the differential pressure throttle valve 6 in at least one of the following ways: adjusting the frequency of the compressor 1, adjusting the speed of the outdoor fan 31, adjusting the speed of the fan corresponding to the first indoor heat exchanger 5 and the fan corresponding to the second indoor heat exchanger 7 in opposite directions, adjusting the opening of the throttling device 4, etc., wherein adjusting the frequency of the compressor 1 may include switching the compressor 1 between the off and on states or adjusting the frequency while the compressor 1 is kept on.

[0081] The air conditioner switches between a second mode and a third mode. When the temperature meets the heating requirement but the humidity does not meet the dehumidification requirement during the operation of the second mode, it can switch to the third mode. When the temperature does not meet the heating requirement during the operation of the third mode, it can switch back to the second mode. Based on this, the heating and dehumidification needs of the indoor environment can be effectively balanced to improve indoor comfort.

[0082] In a second embodiment of the differential pressure throttling valve 6, the differential pressure throttling valve 6 is a bidirectional differential pressure throttling valve. The bidirectional differential pressure throttling valve is configured to switch the minimum flow area and / or the operating state of the differential pressure throttling valve 6 based on the refrigerant pressure difference across the valve in the first refrigerant flow direction, and to switch the minimum flow area and / or the operating state of the differential pressure throttling valve 6 based on the refrigerant pressure difference across the valve in the second refrigerant flow direction. Based on this, the differential pressure throttling valve 6 has a first end 601 and a second end 602, with the first indoor heat exchanger 5 connected to the first end 601 and the second end 602 connected to the second indoor heat exchanger 7.

[0083] In this embodiment, in the third mode, the first indoor heat exchanger 5 is in a condensing state and the second indoor heat exchanger 7 is in an evaporating state. The operation mode of the heat pump system also includes a fourth mode. In the fourth mode, the flow area of ​​the differential pressure throttling valve 6 is a fourth area and / or the differential pressure throttling valve 6 is in a first working state, the first indoor heat exchanger 5 is in an evaporating state, and the second indoor heat exchanger 7 is in a condensing state, with the fourth area being smaller than the second area. In the fourth mode, the compressor 1 is in the on state, the reversing assembly 2 operates in the second state, the throttling device 4 operates at the target opening degree, the flow area of ​​the differential pressure throttling valve 6 is the fourth area and / or the differential pressure throttling valve 6 is in the first working state, the second indoor heat exchanger 7 is in a condensing state, and both the outdoor heat exchanger 3 and the first indoor heat exchanger 5 are in an evaporating state. The target opening degree is greater than the throttling opening degree in the second mode. In the fourth mode, the refrigerant pressure difference across the differential pressure throttling valve 6 is greater than the preset pressure difference, and the flow area of ​​the differential pressure throttling valve 6 can be the first flow area mentioned above.

[0084] In both the first mode and the third mode, the refrigerant flow direction is the first refrigerant flow direction, which is the refrigerant flowing from the outdoor heat exchanger 3 to the second indoor heat exchanger 7. In both the second mode and the fourth mode, the refrigerant flow direction is the second refrigerant flow direction, which is the refrigerant flowing from the second indoor heat exchanger 7 to the outdoor heat exchanger 3.

[0085] The differential pressure throttle valve 6 is configured as follows: When the refrigerant flows from the first end 601 to the second end 602 and the refrigerant pressure difference between the first end 601 and the second end 602 is greater than the preset pressure difference, the flow area of ​​the differential pressure throttle valve 6 is the third area and / or the differential pressure throttle valve 6 is in the first working state. When the refrigerant flows from the first end 601 to the second end 602, and the refrigerant pressure difference between the first end 601 and the second end 602 is less than or equal to the preset pressure difference, the flow area of ​​the differential pressure throttle valve 6 is the first area and / or the differential pressure throttle valve 6 is in the second working state. When the refrigerant flows from the second end 602 to the first end 601 and the refrigerant pressure difference between the second end 602 and the first end 601 is greater than the preset pressure difference, the flow area of ​​the differential pressure throttle valve 6 is the fourth area and / or the differential pressure throttle valve 6 is in the first working state. When the refrigerant flows from the second end 602 to the first end 601, and the refrigerant pressure difference between the second end 602 and the first end 601 is less than or equal to the preset pressure difference, the flow area of ​​the differential pressure throttle valve 6 is the second area and / or the differential pressure throttle valve 6 is in the second working state. When the refrigerant stops flowing, the flow area of ​​the differential pressure throttle valve 6 is the third flow area mentioned above and / or the differential pressure throttle valve 6 is in the third working state.

[0086] Here, both the refrigerant pressure differential and the preset pressure differential are positive values.

[0087] The first area and the second area can be the second circulation area mentioned above, and the third area and the fourth area can be the first circulation area mentioned above.

[0088] The ratio of the third area to the first area is less than or equal to 0.3, for example, it can be 0.1, 0.2, 0.3, etc.

[0089] The ratio of the fourth area to the second area is less than or equal to 0.3, for example, it can be 0.1, 0.2, 0.3, etc.

[0090] In this embodiment, when the refrigerant pressure difference across the differential pressure throttle valve 6 is greater than a preset pressure difference, the temperature difference across the differential pressure throttle valve 6 is also greater than a preset temperature difference. Conversely, when the refrigerant pressure difference across the differential pressure throttle valve 6 is less than or equal to the preset pressure difference, the temperature difference across the differential pressure throttle valve 6 is less than or equal to the preset temperature difference. The preset temperature difference is greater than or equal to 5°C, and for example, it can be 6°C, 8°C, 10°C, 15°C, etc.

[0091] In one implementation, the differential pressure throttle valve 6 may include a housing 61 and a fixed seat 62 disposed within the housing 61. The fixed seat 62 may be disposed in the middle of the housing 61. The elastic element 63, valve core 64 and valve seat 65 may be symmetrically arranged at both ends of the fixed seat 62 as described in the first embodiment above, so that the flow area can be switched based on the change of the pressure difference between the two ends, regardless of whether the refrigerant flows from the first end 601 to the second end 602 or from the second end 602 to the first end 601.

[0092] In this embodiment, the heat pump system can adjust the pressure difference across the differential pressure throttle valve 6 through the components in the heat pump system in both the first and second modes, so that the heat pump system can switch the operating mode to constant temperature dehumidification mode without stopping or reversing, thereby effectively accommodating the different temperature regulation and dehumidification needs of the indoor space regulated by the heat pump system.

[0093] Reference Figure 3 The air conditioner also includes a control device 100, and the compressor 1, throttling device 4, reversing assembly 2, outdoor fan 31 and indoor fan 8 mentioned above are all connected to the control device 100.

[0094] The control device 100 includes: at least one processor 1001; and a memory 1002 communicatively connected to the at least one processor 1001, and a timer 1003, etc.; wherein the memory 1002 stores instructions that can be executed by the at least one processor 1001, the instructions being executed by the at least one processor 1001 to enable the at least one processor 1001 to perform the air conditioner control method in the following embodiment.

[0095] The following is for reference. Figure 3 The diagram illustrates a structural schematic suitable for implementing the control device 100 in the embodiments of this application. The control device 100 in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 3 The control device 100 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0096] like Figure 3As shown, the control device 100 may include a processor 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in memory 1002. The program in memory 1002 may be a program in read-only memory (ROM) or a program loaded from a storage device into random access memory (RAM). The RAM also stores various programs and data required for the operation of the control device 100. The processor 1001 and memory 1002 (ROM and RAM) are interconnected via a bus. An input / output (I / O) interface is also connected to the bus. Typically, the following systems can be connected to the I / O interface: input devices including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices including, for example, magnetic tapes, hard disks, etc.; and communication devices. The communication device allows the control device 100 to communicate wirelessly or wiredly with other devices to exchange data. Although the control unit 100 with various systems is shown in the figure, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0097] Specifically, according to the embodiments disclosed in this application, the method flow described in the following embodiments can be implemented as a computer software program. For example, the embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device. When the computer program is executed by the processor 1001, it performs the functions defined in the control method of the air conditioner of the embodiments disclosed in this application.

[0098] The air conditioner provided in this application, employing the control method of the air conditioner in the following embodiments, solves the technical problem of simplifying the system structure and reducing the number of required parts while achieving dehumidification and reducing temperature drop. Compared with the prior art, the beneficial effects of the air conditioner provided in this application are the same as those of the control method of the air conditioner provided in the following embodiments, and other technical features of this air conditioner are the same as those disclosed in the method of the following embodiments, and will not be repeated here.

[0099] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or air conditioner capable of performing the above functions. The following description uses an air conditioner as an example to illustrate this embodiment and the subsequent embodiments.

[0100] Based on this, the embodiments of this application provide a control method for an air conditioner, referring to... Figure 4 , Figure 4 This is a flowchart illustrating the first embodiment of the control method for the air conditioner of this application.

[0101] In this embodiment, the control method of the air conditioner includes steps S10 to S20: Step S10: Control the air conditioner to operate in a first mode. In the first mode, the flow area of ​​the differential pressure throttle valve is a first area and / or the pressure difference across the differential pressure throttle valve is less than or equal to a preset pressure difference and / or the temperature difference across the differential pressure throttle valve is less than or equal to a preset temperature difference, and both the first indoor heat exchanger and the second indoor heat exchanger are in an evaporation state. Running the first mode here can include starting the first mode or maintaining the first mode.

[0102] In the first mode, the compressor is on, the reversing assembly operates in the first state, the throttling device operates at the throttling opening, the pressure difference across the differential pressure throttling valve is less than or equal to the preset pressure difference, and the flow area of ​​the differential pressure throttling valve is the first area. The refrigerant discharged from the compressor, guided by the reversing assembly, flows sequentially through the outdoor heat exchanger, the throttling device, the first indoor heat exchanger, the differential pressure throttling valve, and the second indoor heat exchanger before returning to the compressor. The outdoor heat exchanger is in a condensing state, while both the first and second indoor heat exchangers are in an evaporating state. When both the first and second indoor heat exchangers are in an evaporating state, they absorb heat from the air during heat exchange with the air flowing through them.

[0103] If the pressure difference across the differential pressure throttle valve is less than or equal to the preset pressure difference and / or the temperature difference across the differential pressure throttle valve is less than or equal to the preset temperature difference, it indicates that the flow area of ​​the differential pressure throttle valve is the first area and / or the differential pressure throttle valve is in the second working state.

[0104] The first mode may include either a cooling mode or a cooling and dehumidification mode.

[0105] In this application, the pressure difference across the differential pressure throttle valve refers to the refrigerant pressure difference across the differential pressure throttle valve.

[0106] The pressure difference across the differential pressure throttle valve is the difference between the inlet pressure and outlet pressure of the differential pressure throttle valve in the preset refrigerant flow direction; the temperature difference across the differential pressure throttle valve is the difference between the inlet temperature and outlet temperature of the differential pressure throttle valve in the preset refrigerant flow direction.

[0107] Step S20: Control the throttling device to increase its opening degree using the target opening degree adjustment parameter, so that the flow area of ​​the differential pressure throttling valve decreases from the first area to the third area and / or the pressure difference across the differential pressure throttling valve is greater than the preset pressure difference and / or the temperature difference across the differential pressure throttling valve is greater than the preset temperature difference, and the first indoor heat exchanger switches from evaporation state to condensation state; wherein, the target opening degree adjustment parameter is greater than or equal to the minimum opening degree adjustment parameter, and the minimum opening degree adjustment parameter is the minimum value of the opening degree adjustment parameter required for the differential pressure throttling valve to switch the flow area of ​​the differential pressure throttling valve to the third area and / or to make the pressure difference across the differential pressure throttling valve greater than the preset pressure difference and / or to make the temperature difference across the differential pressure throttling valve greater than the preset temperature difference.

[0108] The preset pressure difference is greater than or equal to 0.05 MPa, for example, it can be 0.06 MPa, 0.08 MPa, 0.1 MPa, 0.2 MPa, 0.4 MPa, 0.5 MPa, 0.8 MPa, etc. In this embodiment, the preset pressure difference is greater than or equal to 0.1 MPa.

[0109] The preset temperature difference is greater than or equal to 5℃, such as 6℃, 8℃, 10℃, 15℃, etc.

[0110] The ratio between the third area and the first area is less than or equal to 0.3. For example, the ratio can also be 0.1, 0.2, 0.3, etc.

[0111] In step S10, when the air conditioner is operating in cooling or dehumidification mode, if the activation conditions for constant temperature dehumidification mode are met, it indicates that there is no need for cooling but a need for dehumidification. At this time, step S20 can be executed. The activation conditions for constant temperature dehumidification mode may include the conditions that the air conditioner's own operating parameters and / or the environmental state parameters of the indoor space regulated by the air conditioner need to meet. For example, preset switching conditions may include the continuous running time of the first mode reaching a set time, or the indoor temperature of the indoor space regulated by the air conditioner being lower than a preset temperature, or receiving an activation command for constant temperature dehumidification mode, etc.

[0112] In this embodiment, the throttling device is an electronic expansion valve.

[0113] The target opening adjustment parameter is set to control the rate of pressure increase on the inlet side of the differential pressure throttle valve so that the flow area of ​​the differential pressure throttle valve switches from the first area to the third area and / or from the second operating state to the first operating state. The faster the rate of increase, the higher the probability that the pressure difference across the differential pressure throttle valve is greater than the preset pressure difference. Therefore, the target opening adjustment parameter must be greater than or equal to the minimum opening adjustment parameter to ensure that the flow area of ​​the differential pressure throttle valve successfully switches to the third area and / or the differential pressure throttle valve switches to the first operating state. If the target opening adjustment parameter is less than the minimum opening adjustment parameter, it can be considered that the flow area of ​​the differential pressure throttle valve cannot switch to the third area and / or cannot switch to the first operating state. A pressure difference across the differential pressure throttle valve greater than the preset pressure difference and / or a temperature difference across the differential pressure throttle valve greater than the preset temperature difference both indicate that the flow area of ​​the differential pressure throttle valve has reached the third area and / or the differential pressure throttle valve is in the first operating state. In addition, by controlling the throttling device to increase its opening by adjusting the target opening parameter, the momentum of the refrigerant flowing through the differential pressure throttling valve can be increased, ensuring that the refrigerant can drive the valve core of the differential pressure throttling valve to achieve mode switching.

[0114] The target opening adjustment parameters include at least one of the following: target adjustment speed, target opening adjustment amplitude, etc. A larger target adjustment speed results in a faster rate of opening change when the throttling device increases its opening, and a faster rate of pressure rise at the inlet of the differential pressure throttling valve; a smaller target adjustment speed results in a slower rate of opening change when the throttling device increases its opening, and a slower rate of pressure rise at the inlet of the differential pressure throttling valve. A larger target opening adjustment amplitude results in a larger single increase in opening amplitude of the throttling device, and a faster rate of pressure rise at the inlet of the differential pressure throttling valve; a smaller target opening adjustment amplitude results in a smaller single increase in opening amplitude of the throttling device, and a slower rate of pressure rise at the inlet of the differential pressure throttling valve.

[0115] When the target opening adjustment parameter includes the target opening adjustment amplitude, the minimum opening adjustment parameter includes the minimum opening adjustment amplitude.

[0116] When the target opening adjustment parameter includes the target adjustment speed, the minimum opening adjustment parameter includes the minimum adjustment speed. The minimum adjustment speed may include the minimum opening change rate or the minimum excitation speed of the electronic expansion valve.

[0117] In this embodiment, the throttling device is an electronic expansion valve, the target regulating speed is the target excitation speed, and the minimum regulating speed includes the minimum excitation speed, which ranges from [20 pulses / second to 50 pulses / second]. For example, the minimum excitation speed can be 20 pulses / second, 30 pulses / second, 40 pulses / second, 50 pulses / second, etc. In this embodiment, the minimum excitation speed is 30 pulses / second.

[0118] The target opening adjustment parameter can be a preset fixed parameter, or it can be a parameter determined according to the actual situation of the air conditioner. For example, the target opening adjustment parameter can be determined according to the temperature of the outdoor heat exchanger and / or the compressor frequency and / or the temperature of the first indoor heat exchanger and / or the temperature of the second indoor heat exchanger when the start-up conditions of the constant temperature dehumidification mode are met, and so on.

[0119] After step S20, when the flow area of ​​the differential pressure throttling valve reaches the third area and / or the first operating state, the air conditioner enters the third mode. In the third mode, the compressor remains on, the reversing assembly remains in the first state, the opening degree of the throttling device is greater than the preset opening degree (e.g., 50% of the maximum opening degree), the flow area of ​​the differential pressure throttling valve is the third area, the first indoor heat exchanger is in a condensing state and the second indoor heat exchanger is in an evaporating state. The first indoor heat exchanger can release heat to the flowing air, and the second indoor heat exchanger can dehumidify the flowing air. In one implementation, the first area is the maximum flow area of ​​the differential pressure throttling valve or greater than 70% of the maximum flow area of ​​the differential pressure throttling valve, and the third area can be less than 30% of the maximum flow area of ​​the differential pressure throttling valve.

[0120] In the cooling and dehumidifying mode, both the first and second indoor heat exchangers cool and dehumidify the air. In the constant temperature dehumidifying mode, the first indoor heat exchanger heats the air, and the second indoor heat exchanger cools and dehumidifies it. Under the same air conditions in the indoor space, the temperature drop after heat exchange between the air and the first and second indoor heat exchangers is greater in the cooling and dehumidifying mode than in the constant temperature dehumidifying mode. Similarly, the humidity drop after heat exchange between the air and the first and second indoor heat exchangers is greater in the cooling and dehumidifying mode than in the constant temperature dehumidifying mode. In the constant temperature dehumidifying mode, the temperature change after heat exchange between the air and the first and second indoor heat exchangers is less than a preset value; that is, the temperature drop, no change, or slight increase after heat exchange between the air and the first and second indoor heat exchangers is minimal. Among them, the temperature change value is the difference between the air temperature before heat exchange and the air temperature after heat exchange, and the humidity decrease value is the difference between the air humidity before heat exchange and the air humidity after heat exchange.

[0121] In this embodiment, step S10 is executed first, followed by step S20. Step S10 can be a preparatory action for executing step S20.

[0122] This embodiment provides a control method for an air conditioner. In the first mode, both the first and second indoor heat exchangers are in an evaporation state, which can achieve dehumidification and cooling of the indoor environment. In this state, the throttling device is controlled to increase its opening by adjusting the target opening parameter. This can increase the pressure difference across the differential pressure throttling valve to a level above the preset pressure difference and increase the momentum of the refrigerant flowing through the differential pressure throttling valve, ensuring that the refrigerant can drive the valve core of the differential pressure throttling valve. The increase in pressure difference across the differential pressure throttling valve reduces the flow area and / or switches the working state. The temperature of the first indoor heat exchanger can be increased to heat the air, while the second indoor heat exchanger maintains a low temperature to dehumidify the air. This allows the two-pipe air conditioning system to achieve dehumidification while reducing temperature drop. Compared with a three-pipe system, this reduces the number of components required for the installation of the medium-pressure gas pipe between the indoor heat exchanger and the outdoor unit, thereby simplifying the system structure and reducing the number of required parts while achieving dehumidification and reducing temperature drop.

[0123] In one feasible implementation, the target opening adjustment parameter is less than or equal to the maximum opening adjustment parameter allowed by the throttling device.

[0124] The protective throttling device here refers to preventing the internal coil of the throttling device from overheating or preventing damage to the mechanical parts of the throttling device.

[0125] When the target opening adjustment parameter includes the target opening adjustment amplitude, the target opening adjustment amplitude is less than or equal to the maximum opening adjustment amplitude allowed by the throttling device, and the maximum opening adjustment parameter includes the maximum opening adjustment amplitude.

[0126] When the target opening adjustment parameter includes the target adjustment speed, the target adjustment speed is less than or equal to the maximum adjustment speed allowed by the throttling device. The maximum opening adjustment parameter includes the maximum adjustment speed. The maximum adjustment speed may include the maximum opening change rate or the maximum excitation speed of the electronic expansion valve.

[0127] In this embodiment, the throttling device is an electronic expansion valve, the target regulating speed is the target excitation speed, and the maximum regulating speed includes the maximum excitation speed, which ranges from [100 pulses / second to 150 pulses / second]. For example, the maximum excitation speed can be 100 pulses / second, 110 pulses / second, 120 pulses / second, 130 pulses / second, 140 pulses / second, etc. In this embodiment, the maximum excitation speed is 120 pulses / second.

[0128] In one application example, the target excitation speed ranges from [30 pulses / second to 120 pulses / second].

[0129] The target opening adjustment range is 30%-90% of the maximum opening of the throttling device. For example, the target opening adjustment range can be 42%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, etc., of the maximum opening. The minimum opening adjustment range is 20%-40% of the maximum opening of the throttling device. For example, the minimum opening adjustment range can be 25%, 30%, 35%, 40%, etc., of the maximum opening.

[0130] In this embodiment, limiting the target opening adjustment parameters in the above manner can ensure that the first mode can be successfully switched to the constant temperature dehumidification mode while reducing the risk of damage to the throttling device.

[0131] In one feasible implementation, the step of controlling the throttling device to increase the opening degree with the target opening degree adjustment parameter includes: The throttling device is controlled to increase its opening to the target opening by adjusting the target opening parameter. The target opening is greater than or equal to a preset opening, which is the minimum opening required for the differential pressure throttling valve to switch its flow area to the first preset area and / or to switch the differential pressure across the valve to a value greater than the preset differential pressure and / or to switch the temperature difference across the valve to a value greater than the preset temperature difference. In this embodiment, the preset opening range is [50%, 100%] of the maximum opening of the throttling device, meaning the target opening range can be [50%, 100%] of the maximum opening of the throttling device. Therefore, when A is the maximum opening, the target opening can be 50%A, 60%A, 70%A, 80%A, 90%A, etc.

[0132] When the target opening degree is the maximum opening degree, the refrigerant condensed in the outdoor heat exchanger flows directly into the first indoor heat exchanger for secondary condensation without throttling. When the target opening degree is less than the maximum opening degree, the refrigerant condensed in the outdoor heat exchanger can also enter the first indoor heat exchanger for secondary condensation after being weakly throttled by the throttling device.

[0133] In this embodiment, the opening of the throttling device is increased to a sufficiently large target opening according to the target opening adjustment parameters. This ensures that enough high-temperature and high-pressure refrigerant can flow to the inlet position of the differential pressure throttling valve, and that the inlet pressure of the differential pressure throttling valve is large enough so that the pressure difference across the differential pressure throttling valve is large enough to switch the flow area of ​​the differential pressure throttling valve from a larger first area to a smaller third area. This also ensures that the temperature of the first indoor heat exchanger is high enough to effectively heat the indoor air, further ensuring a successful switch to the constant temperature dehumidification mode, thus achieving a balance between indoor temperature and humidity requirements.

[0134] In other embodiments, during the process of controlling the throttling device to increase its opening with the target opening adjustment parameter, it is possible to monitor whether the flow area of ​​the differential pressure throttling valve reaches the third area. When the flow area of ​​the differential pressure throttling valve is the third area, the throttling device can maintain the current opening. Alternatively, when the flow area of ​​the differential pressure throttling valve is the third area, the throttling device can continue to increase its opening with other opening adjustment parameters (such as parameters smaller than the target opening adjustment parameter) until the target opening is reached.

[0135] Based on any of the above embodiments, in the second embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 5 Step S10 includes: Step S11: Control the operating frequency of the compressor to be within the initial frequency range; and / or control the opening degree of the throttling device to be within the initial opening degree range; and / or control the speed of the outdoor fan corresponding to the outdoor heat exchanger to be within the initial speed range. In one implementation, the air conditioner can execute step S11 when it is turned on from a stopped state. In another implementation, the air conditioner can execute step S11 during operation in cooling mode or dehumidification mode. Specifically, step S11 can be executed when the start-up conditions of constant temperature dehumidification mode are met in cooling mode or dehumidification mode.

[0136] Within the initial frequency range, the compressor can operate at a variable initial frequency or maintain a fixed initial frequency. Within the initial opening range, the throttling device can operate at a variable initial opening or maintain a fixed initial opening. Within the initial speed range, the outdoor fan can operate at a variable initial speed or maintain a fixed initial speed.

[0137] The initial frequency range is 20Hz-80Hz, and / or, the initial frequency range is 15%-60% of the compressor's rated frequency. The initial frequency is defined as the compressor's operating frequency falling within this range. The initial frequency can be 20Hz, 40Hz, 60Hz, or 80Hz, etc., and / or, can be 20%, 25%, 30%, 40%, 50%, etc., of the rated frequency. When the air conditioner operates within the initial frequency range, the high-pressure of the air conditioner is increased but will not exceed the pressure value corresponding to the air conditioner's high-pressure protection. The amount of refrigerant in the outdoor heat exchanger is greater than the preset refrigerant amount, increasing the momentum of the refrigerant and ensuring that the refrigerant can drive the valve core of the differential pressure throttle valve to achieve mode switching. This improves the success rate of subsequent switching of the flow area and / or operating state of the differential pressure throttle valve through compressor and / or throttling device actions.

[0138] The initial opening range is 30-100 steps, and / or, the initial opening range is 10%-30% of the maximum opening of the throttling device. The initial opening is defined as the opening of the throttling device within this range; the initial opening can be 40, 60, 80, or 90 steps, etc., and / or, 15%, 20%, 25%, etc., of the maximum opening. Specifically, if the initial opening is less than 30 steps, the indoor heat exchanger risks freezing due to excessively low temperature or triggering a protection shutdown due to excessively high exhaust temperature. If the initial opening is greater than 100 steps, even if the initial opening of the throttling device is increased to the maximum opening, the pressure difference across the differential pressure throttling valve cannot reach a preset pressure difference, preventing the flow area of ​​the differential pressure throttling valve from switching from the first area to the third area. Therefore, setting the initial opening within the above range allows for effective switching of the flow area of ​​the differential pressure throttling valve while preventing the indoor heat exchanger from freezing and triggering high-pressure protection. To further ensure successful switching of the flow area of ​​the differential pressure throttle valve while maintaining the reliability of the air conditioner, the initial opening range is set at [50 steps, 90 steps]. When the air conditioner operates within this initial opening range, the high-pressure of the air conditioner is increased without exceeding the pressure value corresponding to the high-pressure protection of the air conditioner. The amount of refrigerant in the outdoor heat exchanger is greater than the preset amount, increasing the momentum of the refrigerant and ensuring that the refrigerant can drive the valve core of the differential pressure throttle valve to achieve mode switching. This improves the success rate of subsequent switching of the flow area and / or operating state of the differential pressure throttle valve through compressor and / or throttling device actions.

[0139] The initial opening degree can be a preset fixed opening degree, or it can be determined according to the actual situation of the air conditioner. For example, if the preset states include cooling mode, dehumidification mode, or heating mode, the initial opening degree can be determined based on the temperatures of the first indoor heat exchanger and the second indoor heat exchanger when the start-up conditions are met. The initial opening degree is less than the target opening degree and less than 50% of the maximum opening degree of the throttling device. The minimum initial opening degree can be 0. Among them, the opening degree of the throttling device at the initial moment when the start-up conditions of the constant temperature dehumidification mode are met is the reference opening degree, and the initial opening degree is less than the reference opening degree.

[0140] The initial speed range is 50 r / min to 250 r / min; and / or, the initial speed range is 5% to 30% of the rated speed of the outdoor fan. The initial speed is defined as the outdoor fan speed falling within this range. The initial speed can be 80 r / min, 100 r / min, 150 r / min, 180 r / min, 200 r / min, 220 r / min, 250 r / min, etc., and / or, can be 10%, 15%, 20%, 25% of the rated speed, etc. When the initial speed of the outdoor fan is less than 50 rpm, the outdoor heat exchanger temperature is prone to overheating, triggering the system's high-temperature protection shutdown. When the initial speed of the outdoor fan is greater than 250 rpm, there is a risk that insufficient high pressure may prevent the differential pressure throttling valve from successfully switching to the third area after the throttling device increases its opening. Therefore, setting the initial speed within the above range allows for effective switching of the flow area of ​​the differential pressure throttling valve while avoiding triggering the high-temperature protection shutdown. When the air conditioner is running within its initial speed range, the high pressure of the air conditioner is increased but will not exceed the pressure value corresponding to the high pressure protection of the air conditioner. The amount of refrigerant in the outdoor heat exchanger is greater than the preset amount of refrigerant, which increases the momentum of the refrigerant and ensures that the refrigerant can drive the valve core of the differential pressure throttle valve to achieve mode switching. This improves the success rate of subsequent switching of the flow area and / or working state of the differential pressure throttle valve through the operation of the compressor and / or throttling device.

[0141] The compressor's operating frequency is within the initial frequency range, which can be achieved by controlling the compressor to reduce, increase, or maintain the frequency. In this embodiment, the compressor is controlled to reduce its frequency to bring it within the initial frequency range, or the compressor is controlled to increase its frequency to bring it within the initial frequency range, or the compressor's operating frequency is controlled to maintain it within the initial frequency range. Specifically, if the current compressor operating frequency is greater than the initial frequency range, the compressor needs to reduce its frequency to bring it within the initial frequency range; if the current compressor operating frequency is less than the initial frequency range, the compressor needs to increase its frequency to bring it within the initial frequency range; if the current compressor operating frequency is within the initial frequency range, the compressor's operating frequency is controlled to maintain it within the initial frequency range.

[0142] The opening degree of the throttling device is within the initial opening degree range, which can be achieved by increasing, decreasing, or maintaining the opening degree of the throttling device. In this embodiment, the throttling device is controlled to decrease its opening degree so that it is within the initial opening degree range, or the opening degree of the throttling device is controlled to remain within the initial opening degree range. Specifically, if the current opening degree of the throttling device is greater than the initial opening degree range, the throttling device needs to decrease its opening degree to bring it within the initial opening degree range; if the current opening degree of the throttling device is within the initial opening degree range, the opening degree of the throttling device is controlled to remain within the initial opening degree range.

[0143] The outdoor fan's rotational speed is within its initial range, which can be achieved by reducing, increasing, or maintaining the rotational speed. In this embodiment, the outdoor fan corresponding to the outdoor heat exchanger is controlled to reduce its rotational speed to bring it within the initial range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to increase its rotational speed to bring it within the initial range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to maintain its rotational speed within the initial range. Specifically, if the current outdoor fan's rotational speed is greater than the initial range, the outdoor fan needs to reduce its rotational speed to bring it within the initial range; if the current outdoor fan's rotational speed is less than the initial range, the outdoor fan needs to increase its rotational speed to bring it within the initial range; if the current outdoor fan's rotational speed is within the initial range, the outdoor fan is controlled to maintain its operation within the initial range.

[0144] The compressor, outdoor fan, and throttling device can operate in coordination in the following ways: The compressor maintains its current frequency, the outdoor fan reduces its speed to its initial speed range, and the throttling device reduces its opening to its initial opening range; the outdoor fan maintains its current speed, the compressor reduces its frequency to its initial frequency range, and the throttling device reduces its opening to its initial opening range; the throttling device maintains its current opening, the outdoor fan reduces its speed to its initial speed range, and the compressor reduces its frequency to its initial frequency range; the compressor maintains its current frequency, the outdoor fan maintains its current speed, and the throttling device reduces its opening to its initial opening range; the compressor maintains its current frequency, the throttling device maintains its current opening, and the outdoor fan reduces its speed to its initial speed range; the outdoor fan maintains its current speed, the throttling device maintains its current opening, and the compressor reduces its frequency to its initial frequency range; the outdoor fan reduces its current speed to its initial speed range, the compressor reduces its frequency to its initial frequency range, and the throttling device reduces its opening to its initial opening range, and so on.

[0145] In the above coordination process, when it is necessary to reduce the speed of the outdoor fan, reduce the frequency of the compressor, and reduce the opening of the throttling device, the compressor frequency should be reduced first and the outdoor fan speed should be reduced, followed by the throttling device opening; or, the compressor frequency should be reduced first and the throttling device opening should be reduced, followed by the outdoor fan speed; or, the outdoor fan speed should be reduced first and the throttling device opening should be reduced, followed by the outdoor fan speed; or, the outdoor fan speed should be reduced while the compressor frequency is reduced and the throttling device opening is reduced.

[0146] In the above coordination process, when both the compressor frequency and the outdoor fan speed need to be reduced, the compressor frequency should be reduced first, followed by the outdoor fan speed; or, the outdoor fan speed should be reduced first, followed by the compressor frequency; or, both the compressor frequency and the outdoor fan speed should be reduced simultaneously. When both the compressor frequency and the throttling device opening need to be reduced, the compressor frequency should be reduced first, followed by the throttling device opening; or, both the throttling device opening and the compressor frequency should be reduced; or, both the compressor frequency and the throttling device opening should be reduced simultaneously. When both the outdoor fan speed and the throttling device opening need to be reduced, the outdoor fan speed should be reduced first, followed by the throttling device opening; or, both the throttling device opening and the outdoor fan speed should be reduced; or, both the outdoor fan speed and the throttling device opening should be reduced simultaneously.

[0147] In one application example, in step S10, the compressor operates at an initial frequency of 40Hz, the throttling device operates at an initial opening of 60 steps, and the outdoor fan operates at an initial speed of 100rpm; in step S20, the compressor increases to the target frequency of 60Hz, and the throttling device increases its opening to the maximum opening (e.g., 500 steps).

[0148] In this embodiment, when switching from the first mode to the constant temperature dehumidification mode, the compressor, outdoor fan, and throttling device perform initialization actions. This reduces the risk of failure in switching the flow area of ​​the differential pressure throttling valve when the throttling device opening is increased later due to excessive compressor frequency, excessive outdoor fan speed, or excessive throttling device opening. This ensures that the pressure difference across the differential pressure throttling valve can be rapidly increased during the process of increasing the throttling device opening, thereby ensuring a higher success rate of switching the flow area of ​​the differential pressure throttling valve from the first area to the third area, and improving the success rate of switching the air conditioner to the third mode. Specifically, reducing the throttling device opening increases the system high pressure and decreases the low pressure, which is beneficial for increasing the inlet pressure and decreasing the outlet pressure of the differential pressure throttling valve. Reducing the compressor frequency avoids excessive system pressure, and simultaneously increasing the compressor frequency during the subsequent process of increasing the throttling device opening is beneficial for rapidly increasing the pressure difference between the inlet and outlet of the differential pressure throttling valve. Reducing the outdoor fan speed helps increase the system high pressure, which in turn helps increase the pressure difference across the differential pressure throttling valve.

[0149] In other embodiments, in the cooling mode or dehumidification mode, the above initialization action may not be performed. When the start-up conditions of the constant temperature dehumidification mode are met, step S20 may be executed directly.

[0150] In one embodiment, after step S10, step S20 is further performed when a preset switching condition is met.

[0151] The preset switching conditions include at least one of the following: Condition 1: The temperature of the outdoor heat exchanger is greater than or equal to the preset temperature; the preset temperature range is [45℃, 60℃].

[0152] Condition 2: The air conditioner has completed the initialization action.

[0153] Condition 3: The duration for which the throttling device operates within the initial opening range is greater than or equal to a first preset duration; the value range of the first preset duration can be [30s, 7min], for example, 30s, 1min, 2min, 3min, 4min, 5min, 6min, 7min, etc.

[0154] Condition 4: The duration for which the compressor operates at the initial frequency range is greater than or equal to the second preset duration; the value range of the second preset duration can be [30s, 7min], for example, 30s, 1min, 2min, 3min, 4min, 5min, 6min, 7min, etc.

[0155] Condition 5: The duration for which the outdoor fan operates within the initial speed range is greater than or equal to a third preset duration; the value range of the third preset duration can be [30s, 7min], for example, 30s, 1min, 2min, 3min, 4min, 5min, 6min, 7min, etc.

[0156] Condition 6: The air conditioner is capable of increasing the pressure difference across the differential pressure throttle valve from a first pressure difference to a set pressure difference, wherein the set pressure difference is greater than the first pressure difference. The first pressure difference is the pressure difference across the differential pressure throttle valve when the initialization action is not performed. The set pressure difference can be a pre-set fixed pressure difference, or the sum of the first pressure difference and a preset pressure deviation value. The set pressure difference can be less than or equal to the aforementioned preset pressure difference.

[0157] Condition 7: The discharge pressure of the compressor and / or the pressure on the high-pressure side of the air conditioner are greater than or equal to the preset high pressure, which is greater than or equal to 3 MPa.

[0158] Condition 8: The exhaust temperature of the compressor is greater than or equal to a preset exhaust temperature, and the preset exhaust temperature is greater than or equal to 80°C.

[0159] If the preset temperature or preset duration is lower than the lower limit of the above-mentioned range, it is impossible to accurately predict whether increasing the opening of the throttling device will successfully switch the differential pressure throttling valve. If the preset temperature or preset duration is higher than the lower limit of the above-mentioned range, it will not only affect the start-up efficiency of the constant temperature dehumidification mode, but also pose a risk of the indoor heat exchanger freezing or triggering the exhaust protection. Therefore, setting the preset duration or preset temperature within the above-mentioned range can ensure successful switching of the differential pressure throttling valve while improving the start-up efficiency of the constant temperature dehumidification mode, preventing the indoor heat exchanger from freezing, and avoiding the risk of triggering the exhaust protection.

[0160] When the air conditioner meets the preset switching conditions, the high pressure of the air conditioner is increased but will not exceed the pressure value corresponding to the high pressure protection of the air conditioner. The amount of refrigerant in the outdoor heat exchanger is greater than the preset amount of refrigerant, which increases the momentum of the refrigerant and ensures that the refrigerant can drive the valve core of the differential pressure throttle valve to achieve mode switching. This improves the success rate of switching the flow area and / or working state of the differential pressure throttle valve through the action of the throttling device.

[0161] In this embodiment, whether or not any of the above conditions are met can accurately characterize whether the subsequent increase of the compressor frequency and / or the increase of the opening of the throttling device can successfully switch the flow area and / or working state of the differential pressure throttling valve. Based on this, when any of the above conditions are met, step S20 is executed, which helps to ensure the success rate of the differential pressure throttling valve switching to the third area and improve the start-up efficiency of the third mode.

[0162] In one feasible implementation, during the process of controlling the outdoor fan to reduce its speed to the initial speed and controlling the throttling device to reduce its opening degree to the initial opening degree, the moment when the opening degree of the throttling device reaches the initial opening degree is earlier than or equal to the moment when the speed of the outdoor fan reaches the initial speed.

[0163] In one implementation, when the start-up conditions for the constant temperature dehumidification mode are met in the first mode, the outdoor fan speed can be reduced while the throttling device opening degree is reduced. Specifically, the throttling device is controlled to reduce its opening degree from a first opening degree when the start-up conditions for the constant temperature dehumidification mode are met to the initial opening degree at a first rate, and the outdoor fan speed is controlled to reduce its speed from a first speed when the start-up conditions for the constant temperature dehumidification mode are met to the initial speed at a second rate. The difference between the first opening degree and the initial opening degree is the opening degree adjustment amplitude, and the difference between the first speed and the initial speed is the speed adjustment amplitude. The ratio of the opening degree adjustment amplitude to the first rate is less than or equal to the ratio of the speed adjustment amplitude to the second rate. Based on the control of the speed reduction rate and the opening degree reduction rate, the throttling device reaches the initial opening degree earlier than or equal to the time when the outdoor fan reaches the initial speed.

[0164] In another implementation, when the start-up conditions of the constant temperature dehumidification mode are met in the first mode, the throttling device can be controlled to reduce its opening and the outdoor fan can be controlled to maintain its current speed. When the opening of the throttling device reaches the initial opening, the outdoor fan can be controlled to reduce its speed, so that the time when the throttling device reaches the initial opening is earlier than or equal to the time when the outdoor fan reaches the initial speed.

[0165] Based on this, the air conditioner's protective shutdown can be avoided by preventing the outdoor heat exchanger from overheating, thus improving the system's operational reliability and increasing the success rate of switching to the third mode.

[0166] Based on any of the above embodiments, the same or similar content can be referred to the above description, and will not be repeated hereafter. In this embodiment, the control method of the air conditioner further includes: obtaining the operating mode of the air conditioner; when the operating mode is a cooling mode or a cooling and dehumidification mode, executing the step of controlling the air conditioner to operate in a first mode; when the operating mode is a heating mode, controlling the air conditioner to operate in a heating mode, wherein in the heating mode, the flow area of ​​the differential pressure throttling valve is a second area and / or the pressure difference across the differential pressure throttling valve is less than or equal to a preset pressure difference and / or the temperature difference across the differential pressure throttling valve is less than or equal to a preset temperature difference, and the compressor, the reversing assembly, the throttling device, and the differential pressure throttling valve cooperate to ensure that both the first indoor heat exchanger and the second indoor heat exchanger are in a condensing state, and the second area is greater than the third area.

[0167] The operating mode here is obtained by acquiring the user's settings. In addition to the above modes, when the operating mode is the air supply mode, the air conditioner can be controlled to operate in air supply mode, in which the indoor fan is turned on and the compressor is turned off.

[0168] In heating mode, the compressor is on, the reversing assembly operates in its second state, the throttling device operates at its throttling opening, and the flow area of ​​the differential pressure throttling valve is the second area. Guided by the reversing assembly, the refrigerant discharged from the compressor flows sequentially through the second indoor heat exchanger, the differential pressure throttling valve, the first indoor heat exchanger, the throttling device, and the outdoor heat exchanger before returning to the compressor. The outdoor heat exchanger is in an evaporating state, while both the first and second indoor heat exchangers are in a condensing state. When both the first and second indoor heat exchangers are in a condensing state, heat is released into the air during heat exchange with the air flowing through them.

[0169] Based on this, the air conditioner can simultaneously meet the cooling, dehumidification, constant temperature dehumidification, and heating needs of the indoor space, thereby improving the comfort of the indoor space. Among them, when there is no longer a need for cooling during the cooling or dehumidification process, the air conditioner can switch to the third mode to reduce the drop in indoor temperature while dehumidifying, so as to ensure that both indoor temperature and humidity meet the comfort requirements.

[0170] In one feasible implementation, when the air conditioner is in cooling mode or dehumidification mode, step S11 is executed in response to a preset command and / or when the conditions for entering constant temperature dehumidification mode or dehumidification reheat mode are met.

[0171] In one implementation, the preset command includes any one of a dehumidification command, a constant temperature dehumidification command, and a dehumidification reheat command. This preset command can be issued by the user during air conditioner operation or determined according to user instructions. During air conditioner operation, upon receiving a preset command from the user, it can switch to the third mode using the aforementioned method.

[0172] In another implementation, the preset command includes any one of the following: a start-up and dehumidification command, a start-up and constant temperature dehumidification command, or a start-up and dehumidification-reheat command. This preset command can be issued by the user during the air conditioner's shutdown process or determined according to user instructions.

[0173] Meeting the entry conditions here means that the air conditioner has the requirement to dehumidify without lowering the temperature. The entry conditions can be the conditions that the air conditioner's own operating parameters and / or the environmental conditions of the environment in which the air conditioner is located must meet. For example, entry conditions may include an indoor temperature lower than a preset room temperature and an indoor humidity higher than a preset humidity, etc.

[0174] In this embodiment, the conditions for entering the constant temperature dehumidification mode or the dehumidification reheat mode include at least one of the following: The temperature difference between the indoor ambient temperature and the target ambient temperature is less than the first preset temperature difference; The indoor humidity is higher than the first target humidity. The humidity difference between the indoor ambient humidity and the target humidity is greater than or equal to the preset humidity difference. The outdoor ambient temperature is less than or equal to the first preset temperature, and / or the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the first preset temperature; the second preset temperature is less than the first preset temperature.

[0175] When the above entry conditions are met, the air conditioner needs to dehumidify without cooling. The air conditioner needs to switch to the initialization action and then switch to the constant temperature dehumidification mode or the dehumidification and reheat mode.

[0176] Among them, the first preset temperature difference is -2℃ to 2℃, the first target ambient humidity is greater than or equal to 35%, the preset humidity difference is greater than or equal to 5%, the first preset temperature is less than or equal to 40℃, and the second preset temperature is greater than or equal to 8℃.

[0177] During the operation of the air conditioner, it can determine whether the entry conditions are met based on the actual monitoring parameters at set time intervals. If the entry conditions are met, step S11 can be executed.

[0178] Based on any of the above embodiments, in the third embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Furthermore, in this embodiment, after step S10, the following may also be included: Under the condition of meeting the preset switching conditions, the compressor can be controlled to increase the frequency and / or the outdoor fan corresponding to the outdoor heat exchanger can be controlled to reduce the speed, so as to control the throttling device to increase the opening degree by adjusting the target opening degree parameters.

[0179] In one implementation, the compressor can be controlled to increase its frequency, the outdoor fan can be controlled to maintain its speed, and the throttling device can be controlled to increase its opening.

[0180] In another implementation, the compressor can be controlled to maintain its frequency, the outdoor fan can be controlled to reduce its speed, and the throttling device can be controlled to increase its opening.

[0181] In another implementation, the compressor frequency can be increased, the outdoor fan speed can be decreased, and the throttling device opening can be increased. Specifically, the compressor frequency can be increased simultaneously with the outdoor fan speed decreased and the throttling device opening increased; or, the compressor frequency and / or outdoor fan speed can be increased first, followed by the throttling device opening increased; or, the compressor frequency can be increased first, followed by the throttling device opening increased and the outdoor fan speed decreased; or, the outdoor fan speed can be decreased first, followed by the throttling device opening increased and the compressor frequency increased.

[0182] Regarding increasing the compressor frequency, it can be increased to a pre-set target frequency, or the compressor frequency can be increased by adjusting the preset frequency range. Alternatively, the compressor frequency can be increased based on the frequency increase parameters (target frequency or frequency adjustment range, etc.) determined according to the actual operating conditions of the air conditioner, and so on. The compressor frequency can be increased in stages or continuously to the target frequency.

[0183] In this embodiment, the compressor increases its frequency to a target frequency, which ranges from 50Hz to 80Hz, for example, 55Hz, 60Hz, 65Hz, 70Hz, 75Hz, etc. In one application example, the initial frequency is 40Hz and the target frequency is 60Hz.

[0184] In this embodiment, the compressor increases the operating frequency at a preset frequency ramp rate, which ranges from [0.5Hz / s, 5Hz / s], for example, 2Hz / s.

[0185] Regarding reducing the outdoor fan speed, it can be reduced to a pre-set target speed, or the outdoor fan speed can be reduced according to a preset speed adjustment range. Alternatively, the outdoor fan speed can be reduced based on speed reduction parameters (target speed or speed adjustment range, etc.) determined according to the actual operating conditions of the air conditioner (e.g., the temperature of the outdoor heat exchanger). The outdoor fan speed can be reduced in stages or continuously reduced to the target speed.

[0186] In this embodiment, when the preset switching conditions are met, the throttling device increases its opening, and the temperature of the first indoor heat exchanger can be increased to heat the air. In conjunction with the compressor increasing its frequency and / or the outdoor fan reducing its speed, it can further ensure that the differential pressure throttling valve can successfully switch from the first area to the third area, thereby improving the success rate of switching to the third mode and achieving a balance between indoor temperature and humidity.

[0187] In one possible implementation, after step S10, the following may also be included: When the preset switching conditions are met, the outdoor fan speed is reduced; when the air conditioner is running to meet the first condition, the throttling device is controlled to increase the opening degree using the target opening degree adjustment parameter.

[0188] During the process of reducing the speed of the outdoor fan, the compressor can maintain the current frequency, reduce the frequency, or increase the frequency, and the electronic expansion valve can reduce the opening or maintain the current opening.

[0189] In this embodiment, when switching from the first mode to the third mode is required, the outdoor fan speed is reduced, which increases the pressure on the high-pressure side of the system, ensuring that the pressure on the high-pressure side of the system is high enough. With the throttling device increasing the opening, when the high-temperature and high-pressure refrigerant from the outside circulates to the indoor side, it can generate a sufficiently large pressure on the inlet side of the differential pressure throttling valve, ensuring that the pressure difference across the differential pressure throttling valve can reach above the preset pressure difference. This improves the success rate of switching the flow area of ​​the differential pressure throttling valve, thereby further improving the reliability of switching from the first mode to the third mode and effectively balancing indoor temperature and humidity comfort.

[0190] In one feasible implementation, when preset switching conditions are met, the throttling device is controlled to increase its opening degree and the compressor is controlled to increase its frequency by adjusting the target opening degree parameter.

[0191] The throttling device can be increased in opening degree while the compressor frequency is increased. Alternatively, the compressor frequency can be increased, and the throttling device can be increased in opening degree when the compressor frequency reaches the target frequency.

[0192] In this embodiment, based on the previous stage of reducing the outdoor fan speed or adjusting the outdoor fan in conjunction with the throttling device or reducing the opening of the throttling device to increase the system high pressure, increasing the opening of the throttling device in conjunction with the compressor frequency increase can further increase the pressure difference across the differential pressure throttling valve, thereby further improving the success rate of switching the flow area of ​​the differential pressure throttling valve, achieving a successful switch to the third mode, and effectively balancing the temperature and humidity requirements of the indoor space.

[0193] In one application example, after step S10, the following may also be included: When the preset switching conditions are met, the outdoor fan is controlled to reduce its speed to the initial speed, the throttling device is controlled to reduce its opening to the initial opening, and the compressor is controlled to increase its frequency to the target frequency.

[0194] Based on this, it can be further ensured that the differential pressure throttle valve can successfully switch from the first area to the third area, and the air conditioner can successfully switch from the first mode to the third mode.

[0195] Based on any of the above embodiments, in the fourth embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. In addition, after step S20, the method further includes: Acquire a first state parameter and / or a second state parameter, wherein the first state parameter represents the inlet pressure of the differential pressure throttle valve and the second state parameter represents the outlet pressure of the differential pressure throttle valve; when the first state parameter and / or the second state parameter satisfy a second condition, control the compressor to operate according to a target frequency control parameter and control the outdoor fan to operate according to a target speed control parameter; wherein the second condition indicates that the flow area of ​​the differential pressure throttle valve has reached the third area.

[0196] In this embodiment, after step S20, if the throttling device operates at the target opening for a set duration, the first state parameter and / or the second state parameter are acquired. The set duration ranges from [10s, 60s], for example, 20s, 30s, 40s, 50s, etc. Since it takes a certain amount of time for the high-temperature, high-pressure refrigerant to flow to the differential pressure throttling valve after the throttling device increases its opening, if the throttling device operates at the target opening for less than the set duration, it can be assumed that the high-temperature, high-pressure refrigerant has not yet flowed to the differential pressure throttling valve. Therefore, the first state parameter and / or the second state parameter cannot accurately characterize the effectiveness of the differential pressure throttling valve state switching achieved by the actions of each component in step S20. If the throttling device operates at the target opening for a set duration, it can be assumed that the high-temperature, high-pressure refrigerant has flowed to the differential pressure throttling valve. Therefore, the first state parameter and / or the second state parameter can accurately characterize the effectiveness of the differential pressure throttling valve state switching achieved by the actions of each component in step S20. In some other implementations, the first state parameter and / or the second state parameter may be detected at preset time intervals after step S20.

[0197] In both the first and third modes, the refrigerant flows from the outdoor heat exchanger to the second indoor heat exchanger. The refrigerant port on the differential pressure throttle valve that connects to the first indoor heat exchanger is the inlet, and the refrigerant port on the differential pressure throttle valve that connects to the second indoor heat exchanger is the outlet.

[0198] The first state parameter may include at least one of the following: refrigerant pressure at the inlet of the differential pressure throttle valve, refrigerant temperature at the inlet of the differential pressure throttle valve, outlet temperature of the first indoor heat exchanger, temperature of the middle coil of the first indoor heat exchanger, change in inlet temperature of the differential pressure throttle valve before and after increasing the opening of the throttle device, change in inlet pressure of the differential pressure throttle valve before and after increasing the opening of the throttle device, change in outlet temperature of the first indoor heat exchanger before and after increasing the opening of the throttle device, change in temperature of the middle coil of the first indoor heat exchanger before and after increasing the opening of the throttle device, etc.

[0199] The second state parameter may include at least one of the following: refrigerant pressure at the outlet of the differential pressure throttle valve, refrigerant temperature at the outlet of the differential pressure throttle valve, outlet temperature of the second indoor heat exchanger, temperature of the middle coil of the second indoor heat exchanger, change in outlet temperature of the differential pressure throttle valve before and after increasing the opening of the throttle device, change in outlet pressure of the differential pressure throttle valve before and after increasing the opening of the throttle device, change in inlet temperature of the second indoor heat exchanger before and after increasing the opening of the throttle device, change in temperature of the middle coil of the second indoor heat exchanger before and after increasing the opening of the throttle device, etc.

[0200] In one implementation, the first state parameter includes the inlet refrigerant temperature, the second state parameter includes the outlet refrigerant temperature, and the second condition includes that the temperature difference between the inlet and outlet refrigerant temperatures is greater than or equal to a first preset temperature difference. For example, the first preset temperature difference can be set to 5°C. Based on this, by detecting the pressure difference across the differential pressure throttle valve, it can be accurately determined whether the differential pressure throttle valve has switched from the first area to the third area.

[0201] In another implementation, the opening degree of the throttling device after increasing its opening is the target opening degree. The second state parameter includes the first outlet temperature of the throttling device before reaching the target opening degree and the second outlet temperature of the throttling device after reaching the target opening degree. The second condition includes that the temperature difference between the first outlet temperature and the second outlet temperature is greater than or equal to a second preset temperature difference. Based on this, by detecting the change in the outlet temperature of the differential pressure throttling valve, it is possible to accurately determine whether the differential pressure throttling valve has switched from the first area to the third area based on the change in the outlet pressure of the differential pressure throttling valve.

[0202] The target frequency control parameter refers to the compressor control parameters required for adjusting temperature and reducing humidity in the third mode. The target frequency parameter can be the target value that the compressor frequency needs to reach, the target value that the air conditioner's state parameters need to reach during compressor frequency adjustment, or the compressor frequency control curve, etc. In this embodiment, the target frequency control parameter includes the target outlet temperature of the differential pressure throttle valve. The compressor's operating frequency is adjusted based on the actual outlet temperature of the differential pressure throttle valve and the target outlet temperature.

[0203] The target speed control parameter is the control parameter of the outdoor fan required to adjust the temperature and reduce humidity in the third mode. The target speed parameter can be the target value that the outdoor fan speed needs to reach, the target value that the air conditioner's state parameters need to reach during the outdoor fan speed adjustment process, or the speed control curve of the outdoor fan speed, etc. In this embodiment, the target speed control parameter includes adjusting the operating speed of the outdoor fan based on a genetic algorithm.

[0204] In this embodiment, after step S20, it can be accurately determined whether the air conditioner has successfully switched from the first mode to the third mode by the first state parameter and / or the second state parameter. If the switch to the third mode is successful, the compressor and outdoor fan are controlled to run according to the target control parameters in the third mode. If the switch fails, the air conditioner can return to step S10. Based on this, the effectiveness of the third mode operation can be guaranteed, and the indoor temperature and humidity requirements can be effectively met.

[0205] The control method for the air conditioner in any of the above embodiments can be applied to the air conditioner described above, and the operating mode of the air conditioner includes: In the first mode, the flow area of ​​the differential pressure throttle valve is a first area and / or the differential pressure difference across the differential pressure throttle valve is less than or equal to a preset differential pressure difference and / or the temperature difference across the differential pressure throttle valve is less than or equal to a preset temperature difference, and both the first indoor heat exchanger and the second indoor heat exchanger are in an evaporation state. In the third mode, the flow area of ​​the differential pressure throttle valve is the third area and / or the pressure difference across the differential pressure throttle valve is greater than the preset pressure difference and / or the temperature difference across the differential pressure throttle valve is greater than the preset temperature difference, the first indoor heat exchanger is in a condensing state, and the second indoor heat exchanger is in an evaporating state. The air conditioner can increase its opening degree by adjusting parameters at a target opening degree through the throttling device, so that the air conditioner can switch from the first mode to the third mode.

[0206] In one embodiment, the throttling device is an electronic expansion valve, and the target opening adjustment parameter includes a target excitation speed, which is greater than or equal to a minimum excitation speed, and the minimum excitation speed ranges from [20 pulses / second to 50 pulses / second]. Optionally, the target excitation speed ranges from [30 pulses / second to 120 pulses / second].

[0207] In one embodiment, the air conditioner can switch from the first mode to the third mode by first reducing the operating frequency of the compressor, or increasing the operating frequency of the compressor, or maintaining the operating frequency of the compressor within an initial frequency range and / or reducing the opening of the throttling device, or maintaining the opening of the throttling device within an initial opening range and / or reducing the speed of the outdoor fan, or increasing the speed of the outdoor fan, or maintaining the speed of the outdoor fan within an initial speed range, and then increasing the opening of the throttling device with the target opening adjustment parameter.

[0208] The aforementioned actions can be controlled or executed by a control device, processor, or controller in the air conditioner.

[0209] The specific implementation process and corresponding technical effects of the air conditioner can be found in the above-mentioned air conditioner control method embodiment, and will not be repeated here.

[0210] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method of the air conditioner in this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0211] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the air conditioner control method of the above embodiments.

[0212] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0213] The aforementioned computer-readable storage medium may be included in the air conditioner; or it may exist independently and not be installed in the air conditioner.

[0214] The aforementioned computer-readable storage medium carries one or more programs, which, when executed by a processor, cause the processor to execute the flow in the aforementioned air conditioner control method embodiment.

[0215] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0216] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the control method of the air conditioner described above. This solves the technical problem of simplifying the system structure and reducing the number of required parts while achieving dehumidification and reducing temperature drop. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the control method of the air conditioner provided in the above embodiments, and will not be repeated here.

[0217] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0218] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. Modules described in the embodiments of this application can be implemented in software or hardware. The names of modules do not necessarily limit the specific unit itself. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0219] The above descriptions are merely some embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the content of this specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application. Therefore, the protection scope of this application should be determined by the scope of the claims.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes a compressor, a reversing assembly, and an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is configured to switch its minimum flow area and / or its operating state based on the pressure difference across its terminals and / or the momentum of the refrigerant flowing through it. The control method for the air conditioner includes: The air conditioner is controlled to operate in a first mode, in which the flow area of ​​the differential pressure throttle valve is a first area and / or the differential pressure across the differential pressure throttle valve is less than or equal to a preset differential pressure and / or the temperature difference across the differential pressure throttle valve is less than or equal to a preset temperature difference, and both the first indoor heat exchanger and the second indoor heat exchanger are in an evaporation state. The throttling device is controlled to increase its opening by adjusting the target opening parameter, so that the flow area of ​​the differential pressure throttling valve is reduced from the first area to the third area and / or the pressure difference across the differential pressure throttling valve is greater than the preset pressure difference and / or the temperature difference across the differential pressure throttling valve is greater than the preset temperature difference, and the first indoor heat exchanger switches from the evaporation state to the condensation state. Wherein, the target opening adjustment parameter is greater than or equal to the minimum opening adjustment parameter, and the minimum opening adjustment parameter is the minimum value of the opening adjustment parameter required for the differential pressure throttle valve to switch the flow area of ​​the differential pressure throttle valve to the third area and / or to make the differential pressure difference across the differential pressure throttle valve greater than the preset differential pressure difference and / or to make the temperature difference across the differential pressure throttle valve greater than the preset temperature difference.

2. The control method for an air conditioner as described in claim 1, characterized in that, The target opening adjustment parameter includes the target adjustment speed, and the minimum opening adjustment parameter includes the minimum adjustment speed; And / or, the target opening adjustment parameter includes the target opening adjustment amplitude, and the minimum opening adjustment parameter includes the minimum opening adjustment amplitude.

3. The control method for an air conditioner as described in claim 2, characterized in that, The throttling device is an electronic expansion valve, the target adjustment speed is the target excitation speed, the minimum adjustment speed includes the minimum excitation speed, and the minimum excitation speed ranges from [20 pulses / second to 50 pulses / second]. And / or, the target opening adjustment amplitude ranges from 30% to 90% of the maximum opening of the throttling device, and the minimum opening adjustment amplitude ranges from 20% to 40% of the maximum opening of the throttling device.

4. The control method for an air conditioner as described in claim 3, characterized in that, The target excitation speed ranges from [30 pulses / second to 120 pulses / second].

5. The control method for an air conditioner as described in claim 1, characterized in that, The target opening adjustment parameter is less than or equal to the maximum opening adjustment parameter allowed by the throttling device.

6. The control method for an air conditioner as described in claim 5, characterized in that, The target opening adjustment parameter includes the target adjustment speed, and the maximum opening adjustment parameter includes the maximum adjustment speed allowed to protect the throttling device; And / or, the target opening adjustment parameter includes the target opening adjustment amplitude, and the maximum opening adjustment parameter includes the maximum opening adjustment amplitude allowed to protect the throttling device.

7. The control method for an air conditioner as described in claim 1, characterized in that, The step of controlling the throttling device to increase its opening by adjusting the target opening parameter includes: The throttling device is controlled to increase its opening to the target opening by adjusting the target opening parameter; Wherein, the target opening degree is greater than or equal to the preset opening degree, and the preset opening degree is the minimum opening degree required for the differential pressure throttle valve to switch the flow area of ​​the differential pressure throttle valve to the first preset area and / or to switch the differential pressure across the differential pressure throttle valve to a value greater than the preset differential pressure and / or to switch the temperature difference across the differential pressure throttle valve to a value greater than the preset temperature difference.

8. The control method for an air conditioner as described in claim 7, characterized in that, The target opening range is [50%, 100%] of the maximum opening of the throttling device.

9. The control method for an air conditioner as described in claim 1, characterized in that, The steps for controlling the air conditioner to operate in the first mode include: Controlling the compressor's operating frequency to be within an initial frequency range, or controlling the compressor to decrease its frequency to bring its operating frequency within the initial frequency range, or controlling the compressor to increase its frequency to bring its operating frequency within the initial frequency range, or controlling the compressor to maintain its operating frequency within the initial frequency range; and / or, Controlling the opening degree of the throttling device to be within the initial opening degree range, or controlling the opening degree of the throttling device to decrease so that the opening degree of the throttling device is within the initial opening degree range, or controlling the opening degree of the throttling device to be maintained within the initial opening degree range; and / or, The outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed within the initial speed range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed reduced so that its speed is within the initial speed range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed increased so that its speed is within the initial speed range; or, the outdoor fan corresponding to the outdoor heat exchanger is controlled to have its speed maintained within the initial speed range.

10. The control method for an air conditioner as described in claim 9, characterized in that, The initial frequency range is 20Hz-80Hz; and / or, The initial frequency range is 15%-60% of the compressor's rated frequency; and / or, The initial opening range is 30-100 steps; and / or, The initial opening range is 10%-30% of the maximum opening of the throttling device; and / or, The initial rotational speed range is 50 r / min - 250 r / min; and / or, The initial speed range is 5%-30% of the rated speed of the outdoor fan.

11. The control method for an air conditioner as described in claim 9, characterized in that, After the step of controlling the air conditioner to operate in the first mode, the method further includes: When the preset switching conditions are met, the step of controlling the throttling device to increase the opening degree with the target opening degree adjustment parameter is executed; The preset switching conditions include at least one of the following: The outdoor heat exchanger temperature is greater than or equal to the preset temperature; The air conditioner has completed the initialization process; The duration for which the throttling device operates within the initial opening range is greater than or equal to a first preset duration; The compressor operates at the initial frequency range for a duration greater than or equal to the second preset duration; The duration during which the outdoor fan operates within the initial speed range is greater than or equal to the third preset duration; The air conditioner can increase the pressure difference across the differential pressure throttle valve from a first pressure difference to a set pressure difference, wherein the set pressure difference is greater than the first pressure difference; The discharge pressure of the compressor and / or the pressure on the high-pressure side of the air conditioner are greater than or equal to the preset high pressure. The exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature.

12. The control method for an air conditioner as described in any one of claims 1 to 11, characterized in that, The ratio of the third area to the first area is less than or equal to 0.3; and / or, The preset pressure difference is greater than or equal to 0.05 MPa; and / or, The preset temperature difference is greater than or equal to 5℃.

13. The control method for an air conditioner as described in any one of claims 1 to 11, characterized in that, The throttling device is an electronic expansion valve, and / or, the control method of the air conditioner further includes: Obtain the operating mode of the air conditioner; When the operating mode is cooling mode or cooling and dehumidification mode, the step of controlling the air conditioner to operate in the first mode is executed; When the operating mode is heating mode, the air conditioner is controlled to operate in heating mode. In the heating mode, the flow area of ​​the differential pressure throttling valve is the second area and / or the pressure difference across the differential pressure throttling valve is less than or equal to the preset pressure difference and / or the temperature difference across the differential pressure throttling valve is less than or equal to the preset temperature difference. The first indoor heat exchanger and the second indoor heat exchanger are both in a condensing state, and the second area is greater than the third area.

14. An air conditioner, characterized in that, The air conditioner includes a compressor, a reversing assembly, and an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is configured to switch the minimum flow area of ​​the differential pressure throttling valve and / or the operating state of the differential pressure throttling valve based on the pressure difference across its two ends and / or the momentum of the refrigerant flowing through the differential pressure throttling valve. The operating modes of the air conditioner include: In the first mode, the flow area of ​​the differential pressure throttle valve is a first area and / or the differential pressure difference across the differential pressure throttle valve is less than or equal to a preset differential pressure difference and / or the temperature difference across the differential pressure throttle valve is less than or equal to a preset temperature difference, and both the first indoor heat exchanger and the second indoor heat exchanger are in an evaporation state. In the third mode, the flow area of ​​the differential pressure throttle valve is the third area and / or the pressure difference across the differential pressure throttle valve is greater than the preset pressure difference and / or the temperature difference across the differential pressure throttle valve is greater than the preset temperature difference. The first indoor heat exchanger is in a condensing state, and the second indoor heat exchanger is in an evaporating state. The first area is greater than the third area. The air conditioner can increase its opening degree by adjusting parameters at a target opening degree through the throttling device, so that the air conditioner can switch from the first mode to the third mode.

15. The air conditioner as described in claim 14, characterized in that, The throttling device is an electronic expansion valve, and the target opening adjustment parameter includes the target excitation speed, which is greater than or equal to the minimum excitation speed. The minimum excitation speed ranges from [20 pulses / second to 50 pulses / second].

16. The air conditioner as described in claim 15, characterized in that, The target excitation speed ranges from [30 pulses / second to 120 pulses / second].

17. The air conditioner as described in claim 14, characterized in that, The air conditioner can switch from the first mode to the third mode by first reducing the operating frequency of the compressor, or increasing the operating frequency of the compressor, or maintaining the operating frequency of the compressor within the initial frequency range and / or reducing the opening of the throttling device, or maintaining the opening of the throttling device within the initial opening range and / or reducing the speed of the outdoor fan, or increasing the speed of the outdoor fan, or maintaining the speed of the outdoor fan within the initial speed range, and then increasing the opening of the throttling device by the target opening adjustment parameter.

18. An air conditioner, characterized in that, The air conditioner includes a control device, a compressor, a reversing assembly, and an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a differential pressure throttling valve, and a second indoor heat exchanger connected in sequence. The differential pressure throttling valve is configured to switch the minimum flow area of ​​the differential pressure throttling valve and / or the operating state of the differential pressure throttling valve based on the pressure difference across its two ends and / or the momentum of the refrigerant flowing through the differential pressure throttling valve. The compressor, the commutation assembly, and the throttling device are all connected to the control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the air conditioner as described in any one of claims 1 to 13.

19. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for the air conditioner as described in any one of claims 1 to 13.

Images