An air conditioner and a method for controlling the air conditioner.

Abstract

This application provides an air conditioner and a control method for the air conditioner, relating to the field of air conditioning technology, for optimizing the opening degree of the expansion valve of an air conditioner. The air conditioner includes a compressor, a condenser, an evaporator, an economizer, a first expansion valve, a second expansion valve, and a controller. The controller is configured to: determine an adjustment amount for the opening degree of the first expansion valve based on the current suction superheat of the compressor; determine an opening degree compensation amount for the first expansion valve if a first compensation condition or a second compensation condition is met; and determine the current opening degree of the first expansion valve based on the previous opening degree, the opening degree adjustment amount, and the opening degree compensation amount. The first compensation condition includes the condensing temperature of the condenser within a first value range; the second compensation condition includes the current superheat of the compressor's injection gas within a second value range.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to an air conditioner and a method for controlling the air conditioner. Background Technology

[0002] Air conditioners with enthalpy-increasing refrigerant injection function are widely used because they improve cooling / heating efficiency. This type of air conditioner replaces the conventional compressor with one equipped with enthalpy-increasing refrigerant injection, and adds an injection circuit to the main refrigerant piping circuit. The main circuit includes a main expansion valve. Additionally, an economizer is added after the condenser and before the main expansion valve. A portion of the medium-temperature, medium-pressure refrigerant formed in the condenser in the main circuit undergoes heat exchange in the economizer to form medium-temperature, low-pressure refrigerant, which is then returned to the compressor via the injection circuit. In this process, the economizer increases the subcooling of the refrigerant, lowers the compressor's operating temperature, and also consumes some of the compressor's power. However, because the increase in cooling capacity exceeds the increase in compressor energy consumption, the overall energy efficiency of the air conditioner is improved.

[0003] In existing technologies, the opening of the main expansion valve is generally adjusted based on the compressor's suction superheat. However, because the compressor's suction superheat has a relatively small range (generally between 0 and 2°C), the control bandwidth is narrow, resulting in a small adjustable range for the main expansion valve opening. This leads to large adjustment errors and poor adjustment accuracy. Relying solely on the compressor's suction superheat cannot achieve precise control of the main expansion valve opening. If the main expansion valve opening is too large, insufficient refrigerant flow in the gas supply circuit will lead to inadequate heat exchange in the economizer, insufficient refrigerant subcooling, and reduced overall air conditioner efficiency. Conversely, if the main expansion valve opening is too small, insufficient refrigerant flow in the main circuit will cause increased condensing pressure and decreased evaporating pressure, leading to increased compressor discharge temperature and affecting the air conditioner's overall operation. Summary of the Invention

[0004] This application provides an air conditioner and a control method for the air conditioner, solving the problem of large adjustment error in the opening degree of the main expansion valve. To achieve the above objective, this application adopts the following technical solution:

[0005] In a first aspect, an air conditioner is provided, comprising a compressor, an economizer, a condenser, an evaporator, a first expansion valve, a second expansion valve, and a controller. The compressor has an intake port, an exhaust port, and a make-up air port. The economizer has a first inlet and a first outlet connected in series, and a second inlet and a second outlet connected in series. The condenser is connected between the compressor's exhaust port and the economizer's first inlet. The economizer's first outlet is connected to the compressor's intake port via the first expansion valve and the evaporator in sequence. The second expansion valve is connected between the economizer's first outlet and its second inlet. The controller is configured to determine an opening adjustment amount of the first expansion valve based on the compressor's current intake superheat; determine an opening compensation amount of the first expansion valve if a first compensation condition or a second compensation condition is met; and determine the current opening of the first expansion valve based on the first expansion valve's previous opening, the first expansion valve's opening adjustment amount, and the first expansion valve's opening compensation amount. The first compensation condition includes: the condensing temperature of the condenser is within a first value range; the second compensation condition includes: the compressor's current make-up air superheat is within a second value range.

[0006] This application provides an air conditioner that, based on determining the opening adjustment amount of a first expansion valve (also known as a main expansion valve) according to the suction superheat, sets compensation conditions based on at least one of the condenser condensing temperature and the compressor's makeup gas superheat (i.e., either or both), and determines the opening compensation amount of the first expansion valve based on these compensation conditions. This allows for compensated control of the first expansion valve's opening based on the compensation amount. The condensing temperature and makeup gas superheat, as compensation parameters, can compensate for errors caused by adjusting the first expansion valve's opening only using the opening adjustment amount, improving the opening adjustment accuracy of the first expansion valve. This results in more accurate refrigerant flow distribution in the main circuit and the makeup gas circuit, thereby ensuring stable compressor operation and enabling the economizer to achieve sufficient subcooling, thus improving the overall energy efficiency of the air conditioner.

[0007] In some embodiments, the first compensation condition includes: the difference between the condensing temperature of the condenser and the temperature at the outlet of the heat exchange medium of the condenser is greater than a first threshold. The first threshold is determined based on the ambient temperature of the environment in which the compressor is located, or the first threshold is a constant.

[0008] In some embodiments, the second compensation condition includes: the current superheat of the compressor's gas supply is greater than a second threshold; and also includes at least one of the following sub-conditions: the previous opening degree of the first expansion valve was greater than a third threshold; the previous opening degree of the second expansion valve was greater than a fourth threshold.

[0009] In some embodiments, if a first compensation condition or a second compensation condition is met, the opening compensation amount of the first expansion valve is determined based on the previous opening degree of the first expansion valve.

[0010] In some embodiments, if a first compensation condition is met, a first compensation amount is calculated based on the previous opening degree of the first expansion valve; if the first compensation amount is greater than a fifth threshold, it is determined as the opening degree compensation amount of the first expansion valve; if the first compensation amount is less than the fifth threshold, the fifth threshold is determined as the opening degree compensation amount of the first expansion valve; or, if a second compensation condition is met, the opening degree compensation amount of the first expansion valve is determined based on the previous opening degree of the first expansion valve.

[0011] In some embodiments, if the first compensation condition is not met, then if the second compensation condition is met, the opening compensation amount of the first expansion valve is determined.

[0012] In some embodiments, if the second compensation condition is met, a second compensation amount is calculated based on the previous opening degree of the first expansion valve; if the second compensation amount is less than a sixth threshold, it is determined as the opening degree compensation amount of the first expansion valve; if the second compensation amount is greater than the sixth threshold, the sixth threshold is determined as the opening degree compensation amount of the first expansion valve.

[0013] In some embodiments, the opening adjustment amount of the first expansion valve is determined based on the current suction superheat of the compressor and the previous suction superheat.

[0014] In some embodiments, the controller is further configured to determine the opening adjustment amount of the second expansion valve based on the current superheat of the economizer and the previous superheat of the superheat; and to determine the current opening of the second expansion valve based on the previous opening of the second expansion valve and the opening adjustment amount of the second expansion valve.

[0015] Secondly, embodiments of this application provide a control method for an air conditioner. The air conditioner includes a compressor, an economizer, a condenser, an evaporator, a first expansion valve, a second expansion valve, and a controller. The compressor has an intake port, an exhaust port, and a make-up air port. The economizer has a first inlet and a first outlet connected together, and a second inlet and a second outlet connected together. The condenser is connected between the compressor's exhaust port and the economizer's first inlet. The economizer's first outlet is connected to the compressor's intake port via the first expansion valve and the evaporator in sequence. The second expansion valve is connected between the economizer's first outlet and second inlet.

[0016] The control method for this air conditioner includes: determining the opening adjustment amount of a first expansion valve based on the current suction superheat of the compressor; determining the opening compensation amount of the first expansion valve if either a first compensation condition or a second compensation condition is met; wherein the first compensation condition includes the condensing temperature of the condenser within a first value range; and the second compensation condition includes the current injection superheat of the compressor within a second value range; and determining the current opening amount of the first expansion valve based on the previous opening amount, the opening adjustment amount, and the opening compensation amount.

[0017] The beneficial effects described in the second aspect of this application can be referred to in the analysis of the beneficial effects in the first aspect, and will not be repeated here. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0019] Figure 1 A perspective view of an air conditioner provided in an embodiment of this application;

[0020] Figure 2 A structural diagram of an air conditioner provided in an embodiment of this application;

[0021] Figure 3 A circuit connection structure diagram of an air conditioner provided in an embodiment of this application;

[0022] Figure 4 A structural diagram of another air conditioner provided in the embodiments of this application;

[0023] Figure 5 This application provides another circuit connection structure diagram of an air conditioner.

[0024] Figure 6 A schematic diagram illustrating the flow direction of refrigerant in heating mode, provided as an embodiment of this application;

[0025] Figure 7 A schematic diagram illustrating the flow direction of refrigerant in refrigeration mode, provided as an embodiment of this application;

[0026] Figure 8 This application provides another circuit connection structure diagram of an air conditioner.

[0027] Figure 9 A flowchart illustrating a control method for an air conditioner provided in this application embodiment;

[0028] Figure 10 A flowchart illustrating another air conditioner control method provided in this application embodiment. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0033] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0034] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

[0035] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0036] As used herein, depending on the context, the term “if” may optionally be interpreted as meaning “when”, “in the event of”, “in response to determination”, or “in response to detection”. Similarly, depending on the context, the phrase “if it is determined that…” or “if [the stated condition or event] is detected” may optionally be interpreted as meaning “in the event of determination that…”, “in response to determination that…”, “when [the stated condition or event] is detected”, or “in response to the detection of [the stated condition or event]”.

[0037] The use of “applies to” or “configured to” in this article implies an open and inclusive language that does not preclude applicability to or configuration to devices that perform additional tasks or steps.

[0038] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In related technologies, the main circuit of the refrigerant pipeline in an air conditioner is equipped with a main expansion valve. The air conditioner adjusts the opening of the main expansion valve based on the current suction superheat of the compressor, thereby distributing the refrigerant flow in the main circuit and the make-up gas circuit of the refrigerant pipeline. However, because the suction superheat of the compressor varies very little, the adjustable range of the main expansion valve opening is small, resulting in a large adjustment error in the main expansion valve opening. This leads to inaccurate distribution of refrigerant flow in the main circuit and the make-up gas circuit, thus affecting the operating performance of the air conditioner.

[0041] To address the aforementioned issues, this application provides an air conditioner that, based on adjusting the opening of the first expansion valve (also known as the main expansion valve) according to the current suction superheat of the compressor, also comprehensively considers the condensing temperature and the superheat of the make-up gas to compensate for the opening of the first expansion valve, thereby reducing the error in the opening adjustment.

[0042] Figure 1 This is a perspective view of an air conditioner provided in an embodiment of this application. Figure 2 This is a structural diagram of an air conditioner provided in an embodiment of this application. Figure 3 This is a circuit connection diagram of an air conditioner provided in an embodiment of this application.

[0043] See Figure 1 , Figure 2 and Figure 3 The air conditioner 100 includes a compressor 22, a first heat exchanger 23, and a first expansion valve 24. Figure 1 (not shown in the image), Economizer 25, Second Expansion Valve 26 ( Figure 1 (not shown in the image), second heat exchanger 11, refrigerant piping 30 and controller 40 ( Figure 1and Figure 2 (Not shown in the image). Compressor 22, first heat exchanger 23, first expansion valve 24, economizer 25, second expansion valve 26, and second heat exchanger 11 are all electrically connected to controller 40.

[0044] Compressor 22 is a driven fluid machine that elevates low-pressure refrigerant to high-pressure refrigerant, providing power for the refrigerant cycle. Compressor 22 has an intake port E, an exhaust port F, and a make-up port G. Refrigerant enters the compression chamber of compressor 22 through intake port E, where it is compressed into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant exits compressor 22 through exhaust port F and enters refrigerant line 30. A portion of the refrigerant enters compressor 22 through make-up port G and mixes with the refrigerant entering through intake port E, being compressed into a high-temperature, high-pressure gaseous refrigerant. Compressor 22 can be one of the following types: scroll compressor, rotary compressor, screw compressor, or other suitable types.

[0045] The first heat exchanger 23 is used for refrigerant heat exchange. Exemplarily, the first heat exchanger 23 is an air-side heat exchanger. Refrigerant flows into the first heat exchanger 23 from one end of the air-side heat exchanger via the refrigerant pipe 30, and then flows out from the other end back into the refrigerant pipe 30. The first heat exchanger 23 operates as a condenser Q1 in the cooling mode of the air conditioner 100, and as an evaporator Q2 in the heating mode of the air conditioner 100.

[0046] The second heat exchanger 11 is also used for refrigerant heat exchange. For example, the second heat exchanger 11 is a shell-and-tube heat exchanger. Refrigerant flows into the second heat exchanger 11 from one end of the shell-and-tube heat exchanger via refrigerant piping 30, and then flows out from the other end back into refrigerant piping 30. The second heat exchanger 11 operates as a condenser Q1 in the heating mode of the air conditioner 100, and as an evaporator Q2 in the cooling mode of the air conditioner 100.

[0047] An economizer 25 and an expansion valve are connected between the second heat exchanger 11 and the first heat exchanger 23 via a refrigerant pipeline 30. The economizer 25 has a first inlet H1, a first outlet H2, a second inlet J1, and a second outlet J2. The first inlet H1 and the first outlet H2 are connected, and the second inlet J1 and the second outlet J2 are also connected. The expansion valve includes a first expansion valve 24 and a second expansion valve 26. Adjusting the opening of the expansion valves adjusts the refrigerant flow rate in the refrigerant pipeline 30. The expansion valve can be an electronic expansion valve.

[0048] A condenser Q1 is connected between the discharge port F of compressor 22 and the first inlet H1 of economizer 25. The first outlet H2 is connected to the suction port E of compressor 22 via the first expansion valve 24 and evaporator Q2. A second expansion valve 26 is connected between the first outlet H2 and the second inlet J1. The second outlet J2 is connected to the gas supply port G of compressor 22 via gas supply circuit 32.

[0049] In some embodiments, see Figure 2 The second heat exchanger 11 is the indoor unit 10, and the compressor 22, the first heat exchanger 23, the first expansion valve 24, the economizer 25, and the second expansion valve 26 constitute the outdoor unit 20. The indoor unit 10 is typically installed indoors for heat exchange with the indoor environment. Of course, the indoor unit 10 may also include other components. The outdoor unit 20 is typically installed outdoors for heat exchange with the outdoor environment. Of course, the outdoor unit 20 may also include other components. The indoor unit 10 and the outdoor unit 20 are connected via refrigerant piping 30, and both the indoor unit 10 and the outdoor unit 20 are electrically connected to a controller. Exemplarily, the controller can be located in the outdoor unit 20, but it can also be located in the indoor unit 10.

[0050] The refrigerant circulation direction in refrigerant line 30 is as follows: In the main circuit 31, the refrigerant enters the compressor 22 from the suction port E, exits the compressor 22 from the discharge port F, enters the condenser Q1, and then flows into the economizer 25 from the first inlet H1. After exiting the economizer 25 from the first outlet H2, a portion of the refrigerant continues in the main circuit 31, passing sequentially through the first expansion valve 24 and the evaporator Q2, and re-enters the compressor 22 from the suction port E. The other portion of the refrigerant flows into the second expansion valve 26 of the make-up gas circuit 32, enters the economizer 25 from the second inlet J1, exits the economizer 25 from the second outlet J2, and enters the compressor 22 through the make-up gas port G.

[0051] Figure 4 This is a structural diagram of another air conditioner provided in an embodiment of this application. Figure 5 This is a circuit connection structure diagram of another air conditioner provided in an embodiment of this application.

[0052] See Figure 4 and Figure 5 In some embodiments, the air conditioner 100 further includes a four-way valve 21. The four-way valve 21 includes a first port A, a second port B, a third port C, and a fourth port D. Switching the connections of these ports changes the flow direction of the refrigerant in the refrigerant pipeline 30, thereby switching the heating and cooling modes of the air conditioner 100. The first port A is connected to the exhaust port F of the compressor 22, the second port B is connected to one end of the second heat exchanger 11, the third port C is connected to the air inlet E of the compressor 22, and the fourth port D is connected to one end of the first heat exchanger 23. The four-way valve 21 is electrically connected to the controller 40.

[0053] In some embodiments, a gas-liquid separator 27 may also be included between the third interface C and the air inlet E of the compressor 22. The gas-liquid separator 27 is electrically connected to the controller 40. The gas-liquid separator 27 separates the gaseous refrigerant and the liquid refrigerant to prevent the liquid refrigerant from entering the compressor 22 and causing damage to the compressor 22.

[0054] In some embodiments, the air conditioner 100 further includes a first temperature sensor 41 and a first pressure sensor 51, disposed at the compressor's suction port E. The first temperature sensor 41 is used to detect the suction temperature Tslim of the refrigerant in the compressor 22. The first pressure sensor 51 is used to detect the saturated suction pressure of the refrigerant in the compressor 22, the temperature corresponding to the saturated suction pressure being the saturated evaporation temperature Tcs. The first temperature sensor 41 and the first pressure sensor 51 can also be electrically connected to the controller 40. The controller is configured with a suction superheat target value Ktsco1 and a saturated evaporation temperature Tcs corresponding to the saturated suction pressure measured by the first pressure sensor 51. The difference between the suction temperature Tslim and the saturated evaporation temperature Tcs is the compressor's suction superheat. In other implementations, the compressor 22's suction superheat can also be obtained directly. Exemplarily, the controller 40 directly obtains the compressor 22's suction superheat.

[0055] In some embodiments, the air conditioner 100 further includes a second pressure sensor 52. The second pressure sensor 52 is located at the exhaust port F of the compressor 22 and is used to detect the saturated condensing pressure, the temperature corresponding to the saturated condensing pressure being the saturated condensing temperature Tc. The second pressure sensor 52 is electrically connected to the controller 40. The controller is configured with the saturated condensing temperature Tc corresponding to the saturated condensing pressure measured by the second pressure sensor 52.

[0056] In some embodiments, the air conditioner 100 further includes a second temperature sensor 42. The second temperature sensor 42 is used to detect the temperature Tw_o of the heat exchange medium outlet of the condenser Q1. Exemplarily, in heating mode, the second heat exchanger 11 (as the condenser Q1) is a water-side heat exchanger, its heat exchange medium is water, and the temperature Tw_o of the heat exchange medium outlet is the outlet water temperature. The second temperature sensor 42 is electrically connected to the controller 40.

[0057] In some embodiments, the air conditioner 100 further includes a third temperature sensor 43. The third temperature sensor 43 is used to detect the outdoor ambient temperature Ta. Exemplarily, the air conditioner 100 is a heat pump unit, the entire heat pump unit is located outdoors, and the third temperature sensor 43 detects the ambient temperature where the heat pump unit is located. The third temperature sensor 43 is electrically connected to the controller 40.

[0058] In some embodiments, the air conditioner 100 further includes a fourth temperature sensor 44 and a fifth temperature sensor 45. The fourth temperature sensor 44 is disposed at the second outlet J2 of the economizer 25, and the fifth temperature sensor 45 is disposed at the second inlet J1 of the economizer 25. The fourth temperature sensor 44 is used to detect the refrigerant charge temperature TBg at the second outlet J2. The fifth temperature sensor 45 is used to detect the saturated evaporation temperature TBL of the refrigerant in the economizer. At this time, the temperature of the refrigerant at the second inlet J1 is approximately the same as the saturated evaporation temperature TBL, therefore the temperature at the second inlet J1 of the economizer 25 is used as the saturated evaporation temperature TBL.

[0059] The fourth temperature sensor 44 and the fifth temperature sensor 45 can also be electrically connected to the controller 40. The controller is configured with a target value for the refrigerant superheat, Ktsco2. The difference between the refrigerant superheat TBg and the saturated evaporation temperature TBL is the refrigerant superheat of the economizer 25. The refrigerant superheat of the compressor 22 is the same as the refrigerant superheat of the economizer 25. In some implementations, the refrigerant superheat of the economizer 25 can also be obtained directly. For example, the controller 40 directly obtains the refrigerant superheat of the economizer 25. In some implementations, the fourth temperature sensor 44 is located at the refrigerant inlet G of the compressor 22. The fourth temperature sensor 44 is used to detect the refrigerant refrigerant temperature TBg at the refrigerant inlet G. The refrigerant temperatures TBg at the second outlet J2 and the refrigerant inlet G can be considered approximately the same.

[0060] In some embodiments, see continue to see Figure 4 and Figure 5 The air conditioner 100 also includes multiple one-way valves. These one-way valves include a first one-way valve 61, a second one-way valve 62, a third one-way valve 63, and a fourth one-way valve 64. These one-way valves are located on the main circuit 31 of the refrigerant line 30. They are used to switch the flow direction of the refrigerant in the refrigerant line 30. The one-way valves are electrically connected to the controller 40.

[0061] Figure 6 This is a schematic diagram illustrating the flow direction of refrigerant in heating mode, provided as an embodiment of this application.

[0062] See Figure 6When the air conditioner 100 is in heating mode, the compressor 22 starts, and the first expansion valve 24, the second expansion valve 26, the first one-way valve 61, and the third one-way valve 63 all open. The first port A of the four-way valve 21 is connected to the second port B, and the third port C is connected to the fourth port D. The high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port F of the compressor 22 passes through the first port A and the second port B of the four-way valve 21 and enters the second heat exchanger 11 (which acts as the condenser Q1 at this time). The high-temperature and high-pressure gaseous refrigerant is condensed into a medium-temperature and medium-pressure subcooled liquid refrigerant through the second heat exchanger 11. The refrigerant releases heat during condensation, thereby increasing the temperature of the heat exchange medium (e.g., water) at the outlet of the second heat exchanger 11. The medium-temperature, medium-pressure subcooled liquid refrigerant exits from the second heat exchanger 11 and sequentially passes through the first one-way valve 61, the first inlet H1 of the economizer 25, and the first outlet H2 of the economizer 25. It then splits into two paths. One path passes through the first expansion valve 24 and the third one-way valve 63 into the first heat exchanger 12 (which acts as an evaporator) to evaporate into a low-temperature, low-pressure gaseous refrigerant. After exiting the first heat exchanger 23, this low-temperature, low-pressure gaseous refrigerant sequentially passes through the fourth port D and the third port C, entering the compressor 22 through the suction port E, completing one main cycle. The other path passes through the second expansion valve 26, the second inlet J1, and the second outlet J2, flowing through the make-up gas circuit 32 and entering the compressor 22 through the make-up gas port G, completing the make-up gas cycle. The main cycle and the make-up gas cycle complete the refrigerant circulation in the air conditioner 100's heating mode.

[0063] Figure 7 This is a schematic diagram illustrating the flow direction of refrigerant in refrigeration mode, provided as an embodiment of this application.

[0064] See Figure 7 When the air conditioner 100 is in cooling mode, the compressor 22 starts, and the first expansion valve 24, the second expansion valve 26, the second one-way valve 62, and the fourth one-way valve 64 are all open. The first port A of the four-way valve is connected to the fourth port D, and the second port B is connected to the third port C. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor 22 flows into the first heat exchanger 23 (which acts as the condenser Q1 at this time) through the four-way valve 21. The high-temperature and high-pressure gaseous refrigerant condenses into a medium-temperature and high-pressure subcooled liquid refrigerant, which then passes through the second one-way valve 62, the first inlet H1 of the economizer 25, and the first outlet H2 of the economizer 25 in sequence. It splits into two paths. One path passes through the first expansion valve 24 and the fourth one-way valve 64 into the second heat exchanger 11 (which acts as the evaporator Q2 at this time), where it evaporates into a low-temperature and low-pressure gaseous refrigerant (the refrigerant absorbs heat during evaporation, thereby reducing the outlet water temperature of the second heat exchanger 11). This low-temperature and low-pressure gaseous refrigerant then flows into the compressor 22 through the second port B and the third port C in sequence. The other path passes sequentially through the second expansion valve 26, the second inlet J1, and the second outlet J2, flows through the gas replenishment circuit 32, and enters the compressor 22 from the gas replenishment port G, completing the gas replenishment cycle. This completes the refrigerant cycle in the air conditioner's 100 cooling mode.

[0065] Controller 40 refers to a device that can generate operation control signals based on instruction opcodes and timing signals, instructing the air conditioner 100 to execute control commands. Exemplarily, controller 40 can be at least one or a combination of a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a programmable logic device (PLD), a microprocessor, and a microcontroller. Controller 40 can also be other devices with processing functions, such as circuits, devices, or software modules; this application embodiment does not impose any limitations on this.

[0066] In some embodiments, the controller 40 can be a microcontroller unit (MCU). An MCU, also known as a single-chip microcomputer, is a central processing unit (CPU) with its frequency and specifications appropriately reduced. It integrates memory, timer, USB, A / D converter, UART, PLC, DMA, and even LCD driver circuitry onto a single chip, forming a chip-level computer that provides different control combinations for different applications.

[0067] The controller 40 is used to control the operation of various components inside the air conditioner 100 so that the various components of the air conditioner 100 can perform various predetermined functions of the air conditioner 100.

[0068] The controller 40 can execute the following control commands:

[0069] S1. Based on the current suction superheat of compressor 22, determine the opening adjustment amount ΔEVO of the first expansion valve 24.

[0070] The current suction superheat of compressor 22 can be directly obtained, for example, directly by controller 40; or it can be calculated by controller 40 using suction temperature Tslim and saturated evaporation temperature Tcs. The opening adjustment amount ΔEVO of the first expansion valve 24 is determined by the current suction superheat of compressor 22. That is, the opening adjustment amount ΔEVO of the first expansion valve 24 changes with the change of the current suction superheat of compressor 22; or, in other words, the opening adjustment amount ΔEVO of the first expansion valve 24 is the dependent variable of a regulation function, the independent variables of which include the current suction superheat; of course, other independent variables may also be included.

[0071] Specifically, the opening adjustment amount ΔEVO(n) of the first expansion valve 24 is adjusted using a Proportional Integral Derivative (PID) control algorithm. n represents the nth adjustment cycle, and n is an integer greater than or equal to 1, such as 1, 100, 1000, 10000, etc. When n is 1, it indicates that the air conditioner has started operating. The adjustment cycle can be any time preset in the controller 40. For example, an adjustment cycle can be 20 seconds, 5 minutes, or 1 hour; this embodiment does not limit the specific duration.

[0072] The control algorithm is as follows:

[0073] ΔEVO(n) = Kp1 × ΔTs(n),

[0074] ΔTs(n)=Tslim(n)-Tso(n),

[0075] Tso(n) = Tcs(n) + Ktsco1(n),

[0076] In the formula, ΔEVO is the expansion valve opening adjustment based on the suction superheat; ΔTs(n) is the current suction temperature deviation value, °C; Tslim(n) is the current suction temperature, °C; Tso(n) is the current suction temperature target value, °C; Tcs(n) is the current saturated evaporation temperature, °C; Ktsco1(n) is the current suction superheat target value, °C; and Kp1 is the PID control coefficient.

[0077] The current intake superheat target value Ktsco1(n) is set in the controller. The current intake temperature deviation value ΔTs(n) is the difference between the intake superheat and the current intake superheat target value Ktsco1(n).

[0078] In other embodiments, the opening adjustment amount ΔEVO of the first expansion valve 24 is determined by the current suction superheat of the compressor 22 and the previous suction superheat. "Previous" refers to the previous adjustment cycle. After the air conditioner has been running for a period of time, when the user turns on the air conditioner, the controller can obtain the previous suction superheat of the compressor 22 based on a set time, and obtain the previous suction temperature deviation value ΔTs(n-1) from the difference between the previous suction superheat and the previous suction superheat target value. At this time, the opening adjustment amount ΔEVO(n) of the first expansion valve 24 is = Kp2 × (ΔTs(n) - ΔTs(n-1)) + Kp3 × ΔTs(n), where Kp2 and Kp3 are PID control coefficients. Specifically, when n is 1, it indicates that the air conditioner 100 has started running, and the previous suction temperature deviation value ΔTs(n-1) of the compressor 22 is 0℃. The opening adjustment amount ΔEVO(n) of the first expansion valve 24 is determined by the current suction superheat of the compressor 22 and the previous suction superheat, resulting in smaller error and higher accuracy.

[0079] S2. Under the condition that the first compensation condition or the second compensation condition is met, determine the opening compensation amount ΔEVO1 of the first expansion valve 24.

[0080] The first compensation condition includes: the condensing temperature Tc of the condenser is within a first value range. Specifically, the first value range means that the difference between the condensing temperature Tc of the condenser and the temperature Tw_o at the outlet of the heat exchange medium of the condenser is greater than a first threshold.

[0081] The second compensation condition includes: the superheat of the compressor 22's gas supply Ktsco_i is within a second value range. Specifically, the second value range means that the superheat of the compressor 22's gas supply Ktsco_i is greater than (or equal to) the second threshold c.

[0082] Under the condition that the first compensation condition or the second compensation condition is met, the opening compensation amount ΔEVO1 of the first expansion valve 24 can be a constant or can be calculated.

[0083] If the first compensation condition and the second compensation condition are not met, the opening compensation amount ΔEVO1 of the first expansion valve 24 is zero.

[0084] S3. Based on the previous opening degree EVO(n-1), opening adjustment amount ΔEVO(n), and opening compensation amount ΔEVO1 of the first expansion valve 24, determine the current opening degree EVO(n) of the first expansion valve 24.

[0085] Specifically, the current opening degree EVO(n) of the first expansion valve 24 = the previous opening degree EVO(n-1) of the first expansion valve 24 + the opening adjustment amount ΔEVO(n) + the opening compensation amount ΔEVO1.

[0086] The air conditioner provided in this application embodiment, based on determining the opening adjustment amount ΔEVO(n) of the first expansion valve 24 according to the suction superheat, sets compensation conditions according to at least one of the condensing temperature Tc of the condenser Q1 and the superheat of the compressor 22 (i.e., either or both), and determines the opening compensation amount ΔEVO1 of the first expansion valve 24 based on the compensation amount ΔEVO1, so as to compensate and control the opening EVO(n) of the first expansion valve 24 according to the opening compensation amount ΔEVO1. Because the control range of the suction superheat of the compressor 22 is too small, the error caused by adjusting the opening of the first expansion valve 24 by the opening adjustment amount ΔEVO(n) determined by the suction superheat of the compressor 22 is large. The condensing temperature Tc and the superheat of the make-up gas are used as compensation parameters to compensate for this error, thereby improving the adjustment accuracy of the first expansion valve 24, making the flow distribution of refrigerant in the main circuit and the make-up gas circuit more accurate, thus stabilizing the compressor's operating state, and also enabling the economizer 25 to form sufficient subcooling, thereby improving the operating energy efficiency of the air conditioner 100.

[0087] In some embodiments, the first threshold is determined based on the ambient temperature Ta of the environment in which the compressor 22 is located, or the first threshold is a constant A. For example, the first threshold is a*Ta+b, where a and b are constants. The first compensation condition is that the difference between the condensing temperature Tc and the temperature Tw_o at the outlet of the heat exchange medium of the condenser is greater than a*Ta+b. For example, in heating mode, the second heat exchanger 11 is a water-side heat exchanger, which acts as condenser Q1, and its heat exchange medium is water. Therefore, the first compensation condition is that the difference between the condensing temperature Tc and the outlet water temperature Tw_o is greater than a*Ta+b. Alternatively, the first threshold is a constant A, and the first compensation condition is that the difference between the condensing temperature Tc and the temperature Tw_o at the outlet of the heat exchange medium of the condenser is greater than or equal to A. For example, in heating mode, the shell-and-tube heat exchanger acts as the second heat exchanger 11, and the first compensation condition is that the difference between the condensing temperature Tc and the outlet water temperature Tw_o is greater than A. Based on the comparison between the difference between the condensing temperature Tc of condenser Q1 and the temperature Tw_o of the heat exchange medium outlet of condenser and the first threshold, the opening compensation amount ΔEVO1 of the first expansion valve 24 is calculated.

[0088] In some embodiments, the second compensation condition further includes at least one of a plurality of sub-conditions. The plurality of sub-conditions include: the previous opening degree EVO(n-1) of the first expansion valve is greater than a third threshold d; and the previous opening degree EVJ(n-1) of the second expansion valve is greater than a fourth threshold e. The third threshold d and the fourth threshold e are both constants. The controller acquires the previous opening degree EVO(n-1) of the first expansion valve and the previous opening degree EVJ(n-1) of the second expansion valve, and calculates the opening compensation amount ΔEVO1 of the first expansion valve 24 based on the comparison result of the second compensation condition.

[0089] In some embodiments, when a first compensation condition or a second compensation condition is met, the opening compensation amount ΔEVO1 of the first expansion valve is calculated based on the previous opening degree EVO(n-1) of the first expansion valve. For example, the opening compensation amount ΔEVO1 of the first expansion valve is =EVO(n-1) / B, where B is a constant. Also for example, the opening compensation amount ΔEVO1 of the first expansion valve is =-{EVO(n-1) / D}, where D is a constant.

[0090] In some embodiments, when the first compensation condition or the second compensation condition is met, the first compensation amount is obtained based on the previous opening degree EVO(n-1) of the first expansion valve, and then the opening degree compensation amount ΔEVO1 of the first expansion valve is determined by comparing the first compensation amount with the fifth threshold C.

[0091] If the first compensation amount is greater than the fifth threshold C, the calculated first compensation amount is the opening compensation amount of the first expansion valve. If the first compensation amount is equal to the fifth threshold C, the calculated first compensation amount is the opening compensation amount of the first expansion valve. If the first compensation amount is less than the fifth threshold C, then C is the opening compensation amount of the first expansion valve. In some embodiments, if the first compensation amount is less than the fifth threshold C, the opening compensation amount ΔEVO1 of the first expansion valve can also be determined based on the previous opening degree EVO(n-1) of the first expansion valve, provided that the second compensation condition is met.

[0092] In some embodiments, it is first determined whether the first compensation condition is met. If the first compensation condition is not met, then the opening compensation amount ΔEVO1 of the first expansion valve is determined if the second compensation condition is met.

[0093] In this embodiment, the first compensation condition and the second compensation condition have priority. When the first compensation condition is met, it is no longer necessary to determine whether the second compensation condition is met; the opening compensation amount ΔEVO1 of the first expansion valve is directly calculated. When the first compensation condition is not met, it is then determined whether the second compensation condition is met. That is, the first compensation condition takes precedence over the second compensation condition. Typically, when the first compensation condition is met, an opening compensation amount is obtained. If the second compensation condition is met, another opening compensation amount needs to be calculated, and then one of the two opening compensation amounts is selected as the determined opening compensation amount ΔEVO of the first expansion valve 24. This control instruction adds a selection process, reduces the efficiency of determining the opening compensation amount ΔEVO, and thus affects the efficiency of adjusting the opening of the first expansion valve 24. By setting the priority of the compensation conditions, when the first compensation condition with higher priority is met, the second compensation condition with lower priority is invalid. In this way, if the first compensation condition is met, it is not necessary to determine whether the second compensation condition is met, and the opening compensation amount ΔEVO1 of the first expansion valve 24 can be directly determined, which improves the efficiency of determining the opening compensation amount ΔEVO, and thus improves the efficiency of adjusting the opening of the first expansion valve 24.

[0094] In some embodiments, when the second compensation condition is met, a second compensation amount is calculated based on the previous opening degree of the first expansion valve. If the second compensation amount is less than a sixth threshold E, then the second compensation amount is the opening degree compensation amount ΔEVO1 of the first expansion valve. If the second compensation amount is equal to the sixth threshold E, then the second compensation amount is the opening degree compensation amount ΔEVO1 of the first expansion valve. If the second compensation amount is greater than the sixth threshold E, then E is the opening degree compensation amount ΔEVO1 of the first expansion valve.

[0095] In some embodiments, the controller is further configured to determine the opening adjustment amount ΔEVJ of the second expansion valve 26 based on the current superheat of the fuel gas supply of the economizer 25 and the previous superheat of the fuel gas supply. The current opening amount EVJ(n) of the second expansion valve 26 is determined based on the previous opening amount EVJ(n-1) of the second expansion valve 26 and the opening adjustment amount ΔEVJ.

[0096] The current superheat of the fuel gas supplied to the economizer can be obtained directly, for example, directly by the controller 40; or it can be calculated by the controller 40 using the fuel gas temperature TBg and the saturated evaporation temperature TBL. The opening adjustment amount ΔEVJ of the second expansion valve 26 is determined by the current superheat of the fuel gas supplied to the economizer 25. That is, the opening adjustment amount ΔEVJ of the second expansion valve 26 changes with the change of the current superheat of the fuel gas supplied to the economizer 25; or, in other words, the opening adjustment amount ΔEVJ of the second expansion valve 26 is the dependent variable of a regulation function, the independent variables of which include the current superheat of the fuel gas; of course, other independent variables may also be included.

[0097] Specifically, the opening adjustment amount ΔEVJ(n) of the second expansion valve 26 is obtained through a PID control algorithm, and then the opening of the second expansion valve 26 is adjusted. n represents the nth adjustment cycle, as described above, and will not be repeated here.

[0098] The control algorithm is as follows:

[0099] EVJ(n) = EVJ(n-1) + ΔEVJ(n),

[0100] ΔEVJ(n)=Kp4×{⊿Tj(n)-⊿Tj(n-1)}+Kp5×ΔTj(n),

[0101] ΔTj(n)=TBg(n)-Tjo(n),

[0102] Tjo(n) = TBL(n) + Ktsco2(n),

[0103] In the formula, EVJ(n) is the current opening degree of the second expansion valve 26; ΔEVJ is the opening adjustment amount of the second expansion valve 26; ΔTj(n) is the current gas supply temperature deviation value, ℃; ΔTj(n-1) is the gas supply temperature deviation value of the previous calculation time, ℃; TBg(n) is the current gas supply temperature, ℃; Tjo(n) is the current target value of the gas supply temperature, ℃; TBL(n) is the current economizer saturated evaporation temperature, ℃; Ktsco2(n) is the current target value of the gas supply superheat, ℃; Kp4 and Kp5 are PID control coefficients.

[0104] The target value for the superheat of the replenished gas is set in the controller as Ktsco2(n). The current temperature deviation of the replenished gas is ΔTj(n), which is the difference between the superheat of the replenished gas and the target value Ktsco2(n).

[0105] Figure 8 This is a circuit connection structure diagram of another air conditioner provided in an embodiment of this application.

[0106] In some embodiments, see Figure 8The air conditioner 100 also includes a memory 81. The memory 81 is electrically connected to the controller 40. The memory 81 can be used to store software programs and data. For example, the memory 81 stores the correspondence between the saturated condensing pressure measured by the second pressure sensor 52 and the corresponding saturated condensing temperature Tc, the correspondence between the saturated suction pressure of the compressor 22 measured by the first pressure sensor 51 and the corresponding saturated evaporating temperature Tcs, the correspondence between suction superheat and the suction superheat target value Ktsco1(n), and the correspondence between makeup gas superheat and the makeup gas superheat target value Ktsco2(n). The controller 40 executes various functions of the air conditioner 100 and data processing by running the software programs or data stored in the memory 81. The memory 81 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. The memory 81 stores an operating system that enables the air conditioner 100 to operate. In this application, the memory 81 can store the operating system and various applications, and can also store code that executes the control method of an air conditioner 100 provided in the embodiments of this application.

[0107] In some embodiments, see continue to see Figure 8 The air conditioner 100 may include a remote control 82. The remote control 82 is electrically connected to the controller 40 and has the function of communicating with the controller 40, for example, using infrared or other communication methods. The user can use the remote control 82 to perform various controls on the air conditioner 100, realizing interaction between the user and the air conditioner 100.

[0108] In some embodiments, see continue to see Figure 8 The air conditioner 100 may also include a communicator 83. The communicator 83 is electrically connected to the controller 40 and is used to establish a communication connection with the server. The communicator 83 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking an RF module as an example, the RF module can be used for signal reception and transmission; specifically, it sends received information to the controller 40 for processing; additionally, it transmits signals generated by the controller 40. Typically, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, etc.

[0109] In some embodiments, the air conditioner 100 can also send its own operating data to the server via the communicator 83, so that the server can calculate the operating parameters of each component of the multi-split air conditioner 100 during operation based on the data of the air conditioner 100, and then send the calculated operating parameters to the air conditioner 100. Then the controller 40 controls each component in the air conditioner 100 to operate according to the operating parameters calculated by the server.

[0110] The server can be a single server or a server cluster consisting of multiple servers. In some embodiments, the server cluster can also be a distributed cluster. In some embodiments, the service area can also be a cloud server. This application does not limit the specific type of server.

[0111] Figure 9 A flowchart illustrating a control method for an air conditioner provided in an embodiment of this application.

[0112] The air conditioner control method of this application embodiment includes the following steps:

[0113] S100. Based on the current suction superheat of compressor 22, determine the opening adjustment amount ΔEVO of the first expansion valve 24.

[0114] When the air conditioner is turned on, the controller obtains the current suction superheat of the compressor 22 and determines the opening adjustment amount ΔEVO of the first expansion valve 24 according to the control algorithm.

[0115] S200. Under the condition that the first compensation condition or the second compensation condition is met, determine the opening compensation amount ΔEVO1 of the first expansion valve 24.

[0116] The controller acquires the condensing temperature Tc of condenser Q1 and the superheat of the injection gas of compressor 22 Ktsco_i, and determines ΔEVO1 based on whether the first compensation condition or the second compensation condition is met.

[0117] The first and second compensation conditions are described above and will not be repeated here.

[0118] Under the condition that the first compensation condition or the second compensation condition is met, the opening compensation amount ΔEVO1 of the first expansion valve 24 can be a constant or can be calculated.

[0119] If the first compensation condition and the second compensation condition are not met, the opening compensation amount ΔEVO1 of the first expansion valve 24 is zero.

[0120] S300: Based on the previous opening degree EVO(n-1), opening degree adjustment amount ΔEVO, and opening degree compensation amount ΔEVO1 of the first expansion valve 24, determine the current opening degree EVO(n) of the first expansion valve 24, and adjust the opening degree of the first expansion valve 24.

[0121] The specific parameters and calculations are as described in S3 above and will not be repeated here. The first expansion valve 24 is connected to the controller 40, and the controller 40 controls the first expansion valve 24 to adjust to the determined opening degree for this operation.

[0122] Figure 10 A flowchart of another air conditioner control method provided in the embodiments of this application.

[0123] In some embodiments, the control method for an air conditioner includes:

[0124] S100. Based on the current suction superheat of the compressor, determine the opening adjustment amount ΔEVO of the first expansion valve 24. See the description above for details, which will not be repeated here.

[0125] Step S200 includes the following steps:

[0126] S201. Determine whether the first compensation condition is met. If the first compensation condition is met, proceed to S202; if the first compensation condition is not met, proceed to S206.

[0127] S202. Determine the first compensation amount. The first compensation amount can be a constant or it can be calculated. For example, the first compensation amount is determined based on the previous opening degree EVO(n-1) of the first expansion valve 24. Exemplarily, the first compensation amount = EVO(n-1) / B, where B is a constant. In some implementations, step S204 is executed after step S202, and the first compensation amount is the opening degree compensation amount ΔEVO1 of the first expansion valve 24.

[0128] S203. Determine whether the first compensation amount meets the third condition. The third condition is that the first compensation amount is greater than or equal to C. If the third condition is met, proceed to S204; if the third condition is not met, proceed to S205.

[0129] S204, the first compensation amount is the opening compensation amount ΔEVO1 of the first expansion valve 24. After step S204, step S300 is executed.

[0130] S205 and C represent the opening compensation amount ΔEVO1 of the first expansion valve 24. Step S300 is executed after step S205.

[0131] S206. Determine whether the second compensation condition is met. If the second compensation condition is met, proceed to S207; if the second compensation condition is not met, proceed to S211.

[0132] S207. Determine the second compensation amount. The second compensation amount can be a constant or can be calculated. For example, the second compensation amount is determined based on the previous opening degree EVO(n-1) of the first expansion valve 24. Exemplarily, the second compensation amount = -{EVO(n-1) / D}, where D is a constant. In some implementations, step S209 is executed after step S207, and the second compensation amount is the opening degree compensation amount ΔEVO1 of the first expansion valve 24.

[0133] S208. Determine whether the second compensation amount meets the fourth condition. The fourth condition is that the second compensation amount is less than or equal to E. If the fourth condition is met, proceed to S209; if the fourth condition is not met, proceed to S210.

[0134] S209, the second compensation amount is the opening compensation amount ΔEVO1 of the first expansion valve 24. After step S209, S300 is executed.

[0135] S210 and E represent the opening compensation amount ΔEVO1 of the first expansion valve 24. Step S300 is executed after step S210.

[0136] S211, the opening compensation amount ΔEVO1 of the first expansion valve 24 is zero. Step S211 is followed by S300.

[0137] S300: Based on the previous opening degree EVO(n-1), opening adjustment amount ΔEVO, and opening compensation amount ΔEVO1 of the first expansion valve 24, determine the current opening degree EVO(n) of the first expansion valve 24, and adjust the opening degree of the first expansion valve 24. See the description above for details, which will not be repeated here.

[0138] In some embodiments, if both the first compensation condition and the second compensation condition are met simultaneously, at least one of the first compensation amount and the second compensation amount can be determined. For example, the first compensation amount is determined; and for another example, the second compensation amount is determined. After determining the first compensation amount or the second compensation amount, the opening compensation amount ΔEVO1 of the first expansion valve 24 is determined by whether the first compensation amount meets the third condition or whether the second compensation amount meets the fourth condition.

[0139] As can be seen, the above mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, the embodiments of this application provide corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, in conjunction with the modules and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0140] This application embodiment can divide the controller into functional modules according to the above method example. For example, each function can be divided into its own functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. The module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0141] This application also provides a computer-readable storage medium including computer-executable instructions that, when run on a computer, cause the computer to perform any of the refrigerant recovery methods for an air conditioning system provided in the above embodiments.

[0142] This application also provides a computer program product containing computer execution instructions, which, when run on a computer, causes the computer to execute any of the refrigerant recovery methods for an air conditioning system provided in the above embodiments.

[0143] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, implementation can be, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer-executable instructions. When these computer-executable instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer-executable instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer-executable instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state disks, SSDs).

[0144] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, the disclosure, and the appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0145] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

[0146] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air conditioner, characterized in that, include: The compressor has an air intake port, an air exhaust port, and an air supply port; An economic device having a first inlet and a first outlet connected together, and a second inlet and a second outlet connected together; A condenser is connected between the exhaust port of the compressor and the first inlet of the economizer; The first expansion valve and the evaporator are connected in sequence to the suction port of the compressor through the first expansion valve and the evaporator. A second expansion valve is connected between the first outlet of the economizer and the second inlet of the economizer; as well as, The controller is configured to determine the opening adjustment amount of the first expansion valve based on the current suction superheat of the compressor; and to determine the opening compensation amount of the first expansion valve if a first compensation condition or a second compensation condition is met. The current opening degree of the first expansion valve is determined based on the previous opening degree of the first expansion valve, the opening degree adjustment amount of the first expansion valve, and the opening degree compensation amount of the first expansion valve. The first compensation condition includes: the condensing temperature of the condenser is within a first value range; the second compensation condition includes: the current superheat of the compressor's gas supply is within a second value range.

2. The air conditioner according to claim 1, characterized in that, The first compensation condition includes: the difference between the condensing temperature of the condenser and the temperature at the outlet of the heat exchange medium of the condenser is greater than a first threshold; the first threshold is determined based on the ambient temperature of the environment in which the compressor is located, or the first threshold is a constant.

3. The air conditioner according to claim 1, characterized in that, The second compensation condition includes: the current superheat of the compressor's gas supply is greater than the second threshold. The second compensation condition further includes at least one of the following sub-conditions; wherein the plurality of sub-conditions includes: The previous opening degree of the first expansion valve was greater than the third threshold. The previous opening degree of the second expansion valve was greater than the fourth threshold.

4. The air conditioner according to claim 1, characterized in that, Determining the opening compensation amount of the first expansion valve, under the condition that either the first compensation condition or the second compensation condition is met, includes: If the first compensation condition or the second compensation condition is met, the opening compensation amount of the first expansion valve is determined based on the previous opening degree of the first expansion valve.

5. The air conditioner according to claim 4, characterized in that, Determining the opening compensation amount of the first expansion valve, under the condition that either the first compensation condition or the second compensation condition is met, includes: If the first compensation condition is met, the first compensation amount is calculated based on the previous opening degree of the first expansion valve; If the first compensation amount is greater than the fifth threshold, it is determined as the opening compensation amount of the first expansion valve. If the first compensation amount is less than the fifth threshold, the fifth threshold is determined as the opening compensation amount of the first expansion valve; or, if the second compensation condition is met, the opening compensation amount of the first expansion valve is determined based on the previous opening of the first expansion valve.

6. The air conditioner according to claim 1, characterized in that, Determining the opening compensation amount of the first expansion valve, under the condition that either the first compensation condition or the second compensation condition is met, includes: If the first compensation condition is not met, then if the second compensation condition is met, the opening compensation amount of the first expansion valve is determined.

7. The air conditioner according to any one of claims 1 to 6, characterized in that, Determining the opening compensation amount of the first expansion valve, under the condition that either the first compensation condition or the second compensation condition is met, includes: If the second compensation condition is met, the second compensation amount is calculated based on the previous opening degree of the first expansion valve; If the second compensation amount is less than the sixth threshold, it is determined as the opening compensation amount of the first expansion valve; If the second compensation amount is greater than the sixth threshold, then the sixth threshold is determined as the opening compensation amount of the first expansion valve.

8. The air conditioner according to claim 1, characterized in that, Determining the opening adjustment amount of the first expansion valve based on the current suction superheat of the compressor further includes: The opening adjustment amount of the first expansion valve is determined based on the previous suction superheat of the compressor.

9. The air conditioner according to claim 1, characterized in that, The controller is also configured to determine the opening adjustment amount of the second expansion valve based on the current superheat of the economizer and the previous superheat of the superheat; and to determine the current opening of the second expansion valve based on the previous opening of the second expansion valve and the opening adjustment amount of the second expansion valve.

10. A control method for an air conditioner, characterized in that, The air conditioner includes: a compressor, an economizer, a condenser, an evaporator, a first expansion valve, a second expansion valve, and a controller; the compressor has an intake port, an exhaust port, and a make-up port; the economizer has a first inlet and a first outlet connected together, and a second inlet and a second outlet connected together; the condenser is connected between the exhaust port of the compressor and the first inlet of the economizer; the first outlet of the economizer is connected to the intake port of the compressor via the first expansion valve and the evaporator in sequence; the second expansion valve is connected between the first outlet of the economizer and the second inlet of the economizer; The control method for the air conditioner includes: Based on the current suction superheat of the compressor, determine the opening adjustment amount of the first expansion valve; Under the condition of satisfying either the first compensation condition or the second compensation condition, the opening compensation amount of the first expansion valve is determined; wherein, the first compensation condition includes: the condensing temperature of the condenser is within a first value range; the second compensation condition includes: the current superheat of the compressor's gas supply is within a second value range; The current opening degree of the first expansion valve is determined based on the previous opening degree of the first expansion valve, the opening degree adjustment amount of the first expansion valve, and the opening degree compensation amount of the first expansion valve.

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