Control method, apparatus, and storage medium of air conditioner

Abstract

The application discloses a control method and device of an air conditioner and a storage medium, and relates to the technical field of air conditioner equipment, and the control method of the air conditioner comprises the following steps: when the air conditioner operates in a heating mode, the evaporator temperature and / or the condenser temperature are acquired; and the first opening degree of the first throttling valve is adjusted based on the evaporator temperature and / or the condenser temperature. The application solves the technical problem that liquid refrigerant rich in high-boiling-point components is not easy to evaporate in an evaporator, and influences the heat exchange efficiency, and achieves the technical effect of adjusting the refrigerant components input into the evaporator and improving the system heat exchange efficiency.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, and in particular to a control method, device and storage medium for an air conditioner. Background Technology

[0002] Due to environmental protection requirements, an increasing number of air conditioning heat pump manufacturers are using non-azeotropic refrigerants, which are mainly characterized by being a combination of two refrigerants with different boiling points in a certain mass ratio. The advantage is that it can reduce the GWP (Global Warming Potential) value of the mixed refrigerant, thus meeting environmental protection requirements.

[0003] However, the physical properties of non-azeotropic refrigerants differ from those of single-refrigerant, azeotropic, and near-azeotropic refrigerants. Taking R454B as an example, it is composed of R32 and R1234yf at mass fractions of 68.9% and 31.1%, respectively. R32 has a boiling point of -51.7°C and high pressure, while R1234yf has a boiling point of -29°C and low saturation pressure. In the system, the gaseous refrigerant in the two-phase region contains a higher proportion of the low-boiling-point refrigerant R32, while the liquid refrigerant contains a higher proportion of the high-boiling-point refrigerant R1234yf.

[0004] When liquid refrigerant rich in high-boiling-point components enters the evaporator, these high-boiling-point substances are not easy to evaporate, which will lead to uneven temperature distribution inside the evaporator, affect heat exchange efficiency, and thus reduce the overall energy efficiency of the heat pump system. Summary of the Invention

[0005] The main objective of this application is to provide a control method, device, and storage medium for an air conditioner, aiming to solve the technical problem that liquid refrigerants rich in high-boiling-point components are not easily evaporated in the evaporator, thus affecting heat exchange efficiency.

[0006] To achieve the above objectives, this application provides a control method for an air conditioner. The air conditioner includes a flash evaporator and a plate heat exchanger. The liquid refrigerant outlet of the flash evaporator is connected to the first inlet and the second inlet of the plate heat exchanger via a first flow channel and a second flow channel, respectively. When the air conditioner is operating in heating mode, the gaseous refrigerant outlet of the flash evaporator is connected to the first inlet via a third flow channel. A first throttling valve is provided on the first flow channel. The method includes: When the air conditioner is running in heating mode, the evaporator temperature and / or condenser temperature are obtained; Adjust the first opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature.

[0007] In one embodiment, the step of determining the opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature includes: When the temperature of the tube in the middle of the condenser is greater than the preset first target temperature in the middle of the condenser, the first throttle valve is controlled to increase the first opening degree.

[0008] In one embodiment, the step of determining the opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature includes: When the condenser temperature, specifically the pipe temperature in the middle of the condenser, falls within the closed range formed by the preset first target temperature in the middle of the condenser and the preset second target temperature in the middle of the condenser, the first throttle valve is controlled to maintain its current opening. The first target temperature in the middle of the condenser is greater than the second target temperature in the middle of the condenser.

[0009] In one embodiment, the step of determining the opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature includes: When the temperature of the pipe in the middle of the evaporator is lower than the preset temperature of the middle of the evaporator, the first throttle valve is controlled to reduce the first opening degree.

[0010] In one embodiment, the air conditioner further includes an indoor heat exchanger and an outdoor heat exchanger, a second throttling valve is provided between the indoor heat exchanger and the flash evaporator, a third throttling valve is provided between the outdoor heat exchanger and the plate heat exchanger, and a fourth throttling valve is provided in the second flow channel. Before the step of adjusting the first opening of the first throttling valve based on the evaporator temperature and / or the condenser temperature, the following steps are included: It acquires indoor ambient temperature, outdoor ambient temperature, user-set temperature, and compressor discharge temperature; Adjust the second opening of the second throttle valve, the third opening of the third throttle valve, and the fourth opening of the fourth throttle valve based on the condenser temperature, the evaporator temperature, and the plate heat exchanger temperature; and / or, The compressor frequency and fan speed are adjusted based on the compressor exhaust temperature, the indoor ambient temperature, the outdoor ambient temperature, and the user-set temperature.

[0011] In one embodiment, adjusting the second opening of the second throttling valve, the third opening of the third throttling valve, and the fourth opening of the fourth throttling valve based on the condenser temperature, the evaporator temperature, and the plate heat exchanger temperature includes: Determine the evaporator superheat corresponding to the evaporator temperature, the condenser subcooling corresponding to the condenser temperature, and the plate heat exchanger auxiliary circuit superheat corresponding to the plate heat exchanger temperature. When the condenser subcooling is less than or equal to the preset target condenser subcooling, the second throttle valve is controlled to reduce the second opening degree; When the evaporator superheat is less than or equal to the preset target evaporator superheat, the third throttle valve is controlled to reduce the third opening degree. When the overheat of the plate heat exchanger auxiliary circuit is less than or equal to the preset target overheat of the plate heat exchanger auxiliary circuit, the fourth throttle valve is controlled to reduce the fourth opening degree.

[0012] In one embodiment, after the step of obtaining the evaporator temperature and / or condenser temperature, the method includes: In cooling mode, the first throttle valve is closed.

[0013] In one embodiment, the indoor heat exchanger is connected to the flash evaporator via a first one-way valve, the outdoor heat exchanger is connected to the flash evaporator via a second one-way valve, the plate heat exchanger is connected to the indoor heat exchanger via a third one-way valve, and the plate heat exchanger is connected to the outdoor heat exchanger via a fourth one-way valve. After the step of obtaining the evaporator temperature and / or condenser temperature, the following steps are included: In heating mode, the step of adjusting the first opening of the first throttle valve based on the evaporator temperature and / or the condenser temperature is performed. In cooling mode, the step of controlling the first throttle valve to close is performed.

[0014] Furthermore, to achieve the above objectives, this application also provides an air conditioner, which includes a compressor, a four-way valve, an outdoor heat exchanger, a third throttle valve, a plate heat exchanger, a flash evaporator, a second throttle valve, an indoor heat exchanger, a fourth throttle valve, and a first throttle valve. The compressor, the four-way valve, the outdoor heat exchanger, the third throttle valve, the first heat exchange passage of the plate heat exchanger, the flash evaporator, the second throttle valve, and the indoor heat exchanger are sequentially connected to form a main circuit. The liquid refrigerant outlet of the flash evaporator is sequentially connected to the fourth throttle valve, the second heat exchange passage of the plate heat exchanger, and the return or makeup port of the compressor to form a first auxiliary branch. One end of the first throttle valve is connected to the first auxiliary branch between the liquid refrigerant outlet of the flash evaporator and the fourth throttle valve, and the other end of the first throttle valve is connected to the main circuit between the flash evaporator and the plate heat exchanger.

[0015] In one embodiment, the air conditioner is configured to: when the air conditioner is in heating mode, acquire the evaporator temperature of the outdoor heat exchanger and / or the condenser temperature of the indoor heat exchanger; and adjust the first opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature.

[0016] In addition, to achieve the above objectives, this application also provides a control device for an air conditioner, the control device for the air conditioner comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the air conditioner as described above.

[0017] In addition, to achieve the above objectives, this application also provides a storage medium, which is a computer-readable storage medium, on which a program for implementing a control method for an air conditioner is stored, and the program for implementing the control method for an air conditioner is executed by a processor to implement the steps of the control method for an air conditioner as described above.

[0018] This application provides a control method for an air conditioner. The air conditioner includes a flash evaporator and a plate heat exchanger. The liquid refrigerant outlet of the flash evaporator is connected to the first and second inlets of the plate heat exchanger via a first flow channel and a second flow channel, respectively. The gaseous refrigerant outlet of the flash evaporator is connected to the first inlet via a third flow channel. A first throttling valve is provided on the first flow channel. This application first obtains the evaporator temperature and / or the condenser temperature; then, based on the evaporator temperature and / or condenser temperature, it adjusts the first opening degree of the first throttling valve, thereby allowing a portion of the high-boiling-point liquid refrigerant to mix with the low-boiling-point gaseous refrigerant. This mixture then undergoes heat exchange through the plate heat exchanger and is finally input into the evaporator. This adjusts the high-boiling-point and low-boiling-point components of the refrigerant flowing into the evaporator, improving heat exchange efficiency.

[0019] In summary, the air conditioner of this application has a first throttling valve installed in the first flow channel between the liquid refrigerant outlet of the flash evaporator and the first inlet of the plate heat exchanger. The first opening of the first throttling valve is adjusted based on the evaporator temperature and / or condenser temperature, thereby adjusting the refrigerant composition input to the evaporator. This overcomes the technical defect that when liquid refrigerant rich in high-boiling-point components enters the evaporator, the high-boiling-point substances are difficult to evaporate, leading to uneven temperature distribution inside the evaporator and affecting heat exchange efficiency. This achieves the purpose of changing the refrigerant composition inside the evaporator, increasing the enthalpy difference and pressure within the evaporator, increasing evaporative heat absorption, and reducing the compressor pressure ratio. This results in increased heat exchange, reduced power consumption, and improved energy efficiency. Attached Figure Description

[0020] 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.

[0021] 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.

[0022] Figure 1 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to this application. Figure 2 This is a schematic diagram of the system structure of an air conditioner, as an embodiment of the control method for the air conditioner of this application. Figure 3 This is a schematic diagram of the refrigerant circulation process under heating conditions in Embodiment 2 of the control method for the air conditioner of this application; Figure 4 A simplified flowchart illustrating the control method for an air conditioner provided in Embodiment 2 of this application; Figure 5 This is a schematic diagram of the refrigerant circulation process under refrigeration conditions in Embodiment 3 of the control method for the air conditioner of this application; Figure 6 This is a schematic diagram of a system in Embodiment 4 of the control method for an air conditioner of this application, in which the refrigerant composition can be adjusted in both the cooling and heating cycles. Figure 7 This is a schematic diagram of the hardware structure involved in the control device embodiment of the air conditioner of this application.

[0023] Explanation of icon numbers: 1. Compressor; 2. Four-way valve; 3. Indoor heat exchanger; 4. Outdoor heat exchanger; 5. Third throttle valve; 6. Second throttle valve; 7. Fourth throttle valve; 8. First throttle valve; 9. Flash evaporator; 10. Plate heat exchanger; 11. Gas-liquid separator; 12. First check valve; 13. Second check valve; 14. Third check valve; 15. Fourth check valve.

[0024] 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

[0025] 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.

[0026] 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.

[0027] The main solution of this application is as follows: the air conditioner includes a flash evaporator and a plate heat exchanger, the liquid refrigerant outlet of the flash evaporator is connected to the first inlet and the second inlet of the plate heat exchanger through a first flow channel and a second flow channel respectively; the gaseous refrigerant outlet of the flash evaporator is connected to the first inlet through a third flow channel; a first throttling valve is provided on the first flow channel to obtain the evaporator temperature and / or the condenser temperature; the first opening degree of the first throttling valve is adjusted based on the evaporator temperature and / or the condenser temperature.

[0028] Currently, due to environmental protection requirements, more and more air conditioning heat pump manufacturers are using non-azeotropic refrigerants. However, when liquid refrigerants rich in high-boiling-point components enter the evaporator, these high-boiling-point substances do not easily evaporate, leading to uneven temperature distribution inside the evaporator and affecting heat exchange efficiency.

[0029] The air conditioner in this application has a first throttling valve installed in the first flow channel between the liquid refrigerant outlet of the flash evaporator and the first inlet of the plate heat exchanger. The first opening degree of the first throttling valve is adjusted based on the evaporator temperature and / or condenser temperature, thereby adjusting the refrigerant composition input to the evaporator. This overcomes the technical defect that when liquid refrigerant rich in high-boiling-point components enters the evaporator, the high-boiling-point substances are difficult to evaporate, leading to uneven temperature distribution inside the evaporator and affecting heat exchange efficiency. This achieves the purpose of changing the refrigerant composition inside the evaporator, increasing the enthalpy difference and pressure within the evaporator, increasing evaporative heat absorption, and reducing the compressor pressure ratio. This results in increased heat exchange, reduced power consumption, and improved energy efficiency.

[0030] It should be noted that the executing entity in this embodiment can be an air conditioner, or a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or a control device for an air conditioner capable of performing the above functions. This embodiment does not specifically limit the specific implementation. The following uses an air conditioner as the executing entity to describe this embodiment and the following embodiments.

[0031] Based on this, this application proposes a control method for an air conditioner according to a first embodiment. Please refer to [link / reference]. Figure 1 The control method for the air conditioner includes steps S110 to S120: Step S110: When the air conditioner is running in heating mode, obtain the evaporator temperature and / or condenser temperature.

[0032] In this embodiment, refer to Figure 2The air conditioner includes a flash evaporator 9 and a plate heat exchanger 10. The liquid refrigerant outlet of the flash evaporator 9 is connected to the first inlet and the second inlet of the plate heat exchanger 10 through a first flow channel and a second flow channel, respectively. The gaseous refrigerant outlet of the flash evaporator 9 is connected to the first inlet through a third flow channel. A first throttling valve 8 is provided on the first flow channel.

[0033] The liquid refrigerant outlet of flash evaporator 9 is connected to the first inlet of plate heat exchanger 10 via a first flow channel, and the liquid refrigerant outlet of flash evaporator 9 is connected to the second inlet of plate heat exchanger 10 via a second flow channel. In other words, the first and second flow channels serve as two branches of the liquid refrigerant outlet of flash evaporator 9, both from which liquid refrigerant can flow out. The air conditioner uses a non-azeotropic refrigerant, composed of two refrigerants with different boiling points in a certain mass ratio. The function of flash evaporator 9 is to separate the liquid refrigerant output from the condenser into a high-boiling-point liquid refrigerant component and a low-boiling-point gaseous refrigerant component. The gaseous refrigerant outlet of flash evaporator 9 is connected to the first inlet of plate heat exchanger 10 via a third flow channel, meaning that the liquid and gaseous refrigerants are mixed and input into plate heat exchanger 10 through the first inlet. A first throttling valve 8 is installed on the first flow channel. By adjusting the first opening degree of the first throttling valve 8, the ratio of high-boiling-point components and low-boiling-point components in the refrigerant flowing into the first inlet can be adjusted, thereby improving the heat exchange efficiency of the system.

[0034] Furthermore, the air conditioner also includes an indoor heat exchanger 3 and an outdoor heat exchanger 4.

[0035] As an optional implementation, the evaporator and condenser are determined based on the air conditioner's operating mode. In heating mode, the indoor heat exchanger acts as the condenser, and the outdoor heat exchanger acts as the evaporator. In cooling mode, the outdoor heat exchanger acts as the condenser, and the indoor heat exchanger acts as the evaporator. After determining the evaporator and condenser, the evaporator temperature and / or condenser temperature are obtained.

[0036] For example, the evaporator outlet pipe temperature Tout_e, the evaporator middle pipe temperature Tmid_e, the condenser outlet pipe temperature Tout_c, and the condenser middle pipe temperature Tmid_c are obtained.

[0037] Furthermore, the plate heat exchanger auxiliary pipe inlet temperature Tin_IHX_s, the plate heat exchanger auxiliary pipe outlet temperature Tout_IHX_s, and the compressor discharge temperature Td can also be obtained.

[0038] Step S120: Adjust the first opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature.

[0039] In this embodiment, the first throttle valve is used to control the refrigerant flow rate of the liquid refrigerant in the first flow channel. The first opening degree is the current opening degree of the first throttle valve.

[0040] After obtaining the evaporator temperature and / or condenser temperature, based on the numerical relationship between the target evaporator temperature and the evaporator temperature, and / or the numerical relationship between the target condenser temperature and the condenser temperature, a first target opening degree is determined, and then the first opening degree of the first throttle valve is adjusted to the first target opening degree.

[0041] In a first optional embodiment, when the temperature of the tube in the middle of the condenser is greater than the preset first target temperature in the middle of the condenser, the first throttle valve is controlled to increase the first opening degree.

[0042] In this embodiment, the condenser middle tube temperature is obtained from the condenser temperature, and a preset first target temperature of the condenser middle is obtained. When the condenser middle tube temperature is greater than the preset first target temperature of the condenser middle, the first throttle valve is controlled to increase the first opening degree.

[0043] For example, the temperature of the central tube in the condenser is acquired. When the central tube temperature exceeds a preset first target temperature in the central part of the condenser, the first opening of the first throttle valve is increased. Specifically, a first adjustment value is acquired. When the first opening plus the first adjustment value is greater than or equal to the limit opening of the first throttle valve, the first opening of the first throttle valve is adjusted to its limit opening. When the first opening plus the first adjustment value is less than the limit opening of the first throttle valve, the first throttle valve is increased by the opening value corresponding to the first adjustment value.

[0044] For example, the temperatures of the condenser and evaporator are monitored in real time by a temperature sensor, and the temperature signals are transmitted to the controller. The controller determines whether the temperature of the central condenser tubes is greater than a preset first target temperature for the central condenser. Based on the acquired condenser temperature, the controller extracts the central condenser tube temperature and compares it with the preset first target temperature. If the central condenser tube temperature is greater than the preset first target temperature, the controller sends a command to the first throttle valve actuator to increase the first opening degree of the first throttle valve. Through the feedback signal from the first throttle valve actuator, the controller monitors the actual opening degree of the first throttle valve in real time and compares it with the set opening degree to ensure the accuracy of the adjustment.

[0045] Optionally, the above steps can be cyclically adjusted to achieve continuous and precise control of the first throttle valve.

[0046] Furthermore, when increasing the first opening degree of the first throttle valve, the temperature is kept stable at the increased first opening degree for a preset time.

[0047] In a second optional embodiment, when the condenser temperature, specifically the pipe temperature in the middle of the condenser, falls within a closed interval formed by a preset first target temperature in the middle of the condenser and a preset second target temperature in the middle of the condenser, the first throttle valve is controlled to maintain its current opening; wherein the first target temperature in the middle of the condenser is greater than the second target temperature in the middle of the condenser.

[0048] In this embodiment, a first target temperature and a second target temperature for the middle section of the condenser are preset. The first target temperature is greater than the second target temperature, meaning that the first and second target temperatures form a temperature range. The current opening degree is the current first opening degree of the first throttle valve.

[0049] Obtain the preset first target temperature and second target temperature of the condenser. When the condenser temperature is greater than or equal to the second target temperature of the condenser and less than or equal to the first target temperature of the condenser, maintain the first opening degree of the first throttle valve unchanged.

[0050] For example, the controller determines whether the temperature of the central tube in the condenser is within the closed interval formed by the preset first target temperature and the preset second target temperature of the central tube. Based on the acquired condenser temperature, the controller extracts the central tube temperature and compares it with the preset first and second target temperatures. If the central tube temperature is within the closed interval formed by the preset first and second target temperatures, the controller sends a command to the first throttle valve actuator to maintain its current opening. Through the feedback signal from the first throttle valve actuator, the controller monitors the actual opening of the first throttle valve in real time and compares it with the set opening to ensure the accuracy of the adjustment.

[0051] In a third alternative embodiment, when the temperature of the pipe in the middle of the evaporator is lower than the preset temperature in the middle of the evaporator, the first throttle valve is controlled to reduce the first opening degree.

[0052] In this embodiment, in addition to adjusting the first opening degree of the first throttle valve based on the condenser temperature, the first opening degree can also be adjusted in conjunction with the evaporator temperature. The preset evaporator center temperature is the target temperature value of the evaporator center pipe temperature, which is an empirical value.

[0053] The preset evaporator mid-section temperature is obtained. When the obtained evaporator mid-section pipe temperature is lower than the preset evaporator mid-section temperature, it indicates that the heat exchange efficiency of the evaporator has not reached the target value. At this time, the first throttle valve is controlled to reduce the first opening degree so that the mixed refrigerant flowing into the first inlet of the plate heat exchanger contains less high-boiling-point components, thereby improving the heat exchange efficiency of the evaporator.

[0054] The above are only three feasible implementations of step S120 provided in this embodiment. This embodiment does not specifically limit the specific implementation of step S120.

[0055] For example, refer to Figure 3 In heating mode, after the refrigerant is discharged from compressor 1, it passes through four-way valve 2 and enters indoor heat exchanger 3 for condensation heat exchange, becoming a subcooled pure liquid. Then, it undergoes a first throttling through second throttling valve 6, becoming a medium-pressure flash vapor-liquid two-phase state, and enters flash evaporator 9, where gas-liquid separation occurs. The gaseous portion contains a higher proportion of low-boiling-point refrigerant, while the liquid portion contains a higher proportion of high-boiling-point refrigerant. The gaseous refrigerant flowing out of flash evaporator 9 is designated as path D. The liquid refrigerant is divided into two paths: path B and path D mix to form path C, which then enters plate heat exchanger 10. Path A flows through fourth throttling valve 7 to become low-pressure refrigerant, entering plate heat exchanger 10 to exchange heat with path C refrigerant. This causes path C refrigerant to become subcooled and pure liquid, while path A absorbs heat and becomes superheated. Path C then flows through third throttling valve 5 for pressure reduction and throttling to low pressure, before entering outdoor heat exchanger 4 for evaporation heat exchange, and finally passing through four-way valve 2 to enter gas-liquid separator 11. After absorbing heat in the plate heat exchanger 10, path A enters between the four-way valve 2 and the gas-liquid separator 11, where it merges with path C and enters the gas-liquid separator 11 together. It then enters the compressor 1 for compression. Path A corresponds to the second flow channel, path B corresponds to the first flow channel, path D corresponds to the third flow channel, and path C corresponds to the flow channel formed by the mixing of the first and third flow channels.

[0056] This embodiment provides a control method for an air conditioner. The air conditioner includes a flash evaporator and a plate heat exchanger. The liquid refrigerant outlet of the flash evaporator is connected to the first and second inlets of the plate heat exchanger via a first flow channel and a second flow channel, respectively. The gaseous refrigerant outlet of the flash evaporator is connected to the first inlet via a third flow channel. A first throttling valve is installed on the first flow channel. This embodiment first obtains the evaporator temperature and / or condenser temperature; then, based on the evaporator temperature and / or condenser temperature, it adjusts the first opening degree of the first throttling valve, thereby mixing a portion of the high-boiling-point liquid refrigerant with the low-boiling-point gaseous refrigerant. The mixture then undergoes heat exchange through the plate heat exchanger and is finally input into the evaporator. This adjusts the high-boiling-point and low-boiling-point components of the refrigerant flowing into the evaporator, improving heat exchange efficiency.

[0057] In summary, the air conditioner in this embodiment has a first throttling valve installed in the first flow channel between the liquid refrigerant outlet of the flash evaporator and the first inlet of the plate heat exchanger. The first opening of the first throttling valve is adjusted based on the evaporator temperature and / or condenser temperature, thereby adjusting the refrigerant composition input to the evaporator. This overcomes the technical defect that when liquid refrigerant rich in high-boiling-point components enters the evaporator, the high-boiling-point substances are difficult to evaporate, leading to uneven temperature distribution inside the evaporator and affecting heat exchange efficiency. This achieves the goal of changing the refrigerant composition inside the evaporator, increasing the enthalpy difference and pressure within the evaporator, increasing evaporative heat absorption, and reducing the compressor pressure ratio. This results in increased heat exchange, reduced power consumption, and improved energy efficiency.

[0058] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description and will not be repeated hereafter. Based on this, before step S120, the following is included: Step S210: Obtain the indoor ambient temperature, outdoor ambient temperature, user-set temperature, and compressor exhaust temperature.

[0059] In this embodiment, the air conditioner further includes an indoor heat exchanger and an outdoor heat exchanger. A second throttling valve is provided between the indoor heat exchanger and the flash evaporator, a third throttling valve is provided between the outdoor heat exchanger and the plate heat exchanger, and a fourth throttling valve is provided in the second flow channel.

[0060] The air conditioner also includes an indoor heat exchanger and an outdoor heat exchanger. A four-way valve controls the connection between the compressor's refrigerant outlet and the indoor and outdoor heat exchangers. A second throttling valve is installed between the refrigerant inlet of the indoor heat exchanger and the flash evaporator, and a third throttling valve is installed between the first outlet of the outdoor heat exchanger and the first outlet of the plate heat exchanger. The first outlet of the plate heat exchanger is connected to its first inlet. A fourth throttling valve is installed in the second flow channel of the liquid refrigerant outlet corresponding to the flash evaporator.

[0061] In heating mode, the second throttle valve controls the subcooling of the condenser and the flashing rate of the gas flowing through the flash evaporator. The third throttle valve controls the flow rate and evaporation pressure of the evaporator. The fourth throttle valve controls the flow rate of the refrigerant entering the plate heat exchanger for evaporation and heat absorption, i.e., the refrigerant flow rate in the second channel.

[0062] As an optional implementation method, the temperature parameters of various components of the air conditioner, as well as the indoor and outdoor ambient temperatures, are detected.

[0063] For example, in addition to acquiring the evaporator and condenser temperatures of the air conditioner, the system also acquires the indoor ambient temperature, outdoor ambient temperature, user-set temperature, and compressor discharge temperature. The order in which these temperature parameters are acquired is not limited; that is, the acquired temperature parameters can be any combination of at least one of the aforementioned temperature parameters.

[0064] Step S220: Adjust the second opening degree of the second throttle valve, the third opening degree of the third throttle valve, and the fourth opening degree of the fourth throttle valve based on the condenser temperature, the evaporator temperature, and the plate heat exchanger temperature.

[0065] In this embodiment, the fourth opening degree of the fourth throttle valve is adjusted based on the plate heat exchanger temperature, the third opening degree of the third throttle valve is adjusted based on the evaporator temperature, and the second opening degree of the second throttle valve is adjusted based on the condenser temperature.

[0066] As an optional implementation, step S220 includes: Step S221: Determine the evaporator superheat corresponding to the evaporator temperature, the condenser subcooling corresponding to the condenser temperature, and the plate heat exchanger auxiliary circuit superheat corresponding to the plate heat exchanger temperature.

[0067] In this embodiment, the evaporator superheat is determined based on the evaporator outlet pipe temperature and the evaporator middle pipe temperature. The condenser subcooling is determined based on the condenser outlet pipe temperature and the condenser middle pipe temperature. The plate heat exchanger superheat is determined based on the plate heat exchanger auxiliary pipe inlet temperature and the plate heat exchanger auxiliary pipe outlet temperature.

[0068] As an optional implementation, the evaporator superheat is defined as the evaporator outlet pipe temperature minus the evaporator mid-pipe temperature, i.e., evaporator superheat ΔTe = Tout_e - Tmid_e. The condenser subcooling is defined as the condenser mid-pipe temperature minus the condenser outlet pipe temperature, i.e., condenser subcooling ΔTc = Tmid_c - Tout_c. The plate heat exchanger auxiliary circuit superheat is defined as the plate heat exchanger auxiliary circuit outlet pipe temperature minus the plate heat exchanger inlet pipe temperature, i.e., plate heat exchanger auxiliary circuit superheat ΔTs = Tout_IHX_s - Tin_IHX_s.

[0069] Evaporator superheat refers to the difference between the actual temperature of the refrigerant vapor on the low-pressure side and its evaporation temperature. Ideally, evaporator superheat is typically maintained between 5 and 8 degrees Celsius. This superheat ensures that the refrigerant enters the compressor in a completely gaseous state, preventing damage from liquid refrigerant entering the compressor; this is called beneficial superheat. Condenser subcooling represents the difference between the saturated liquid temperature corresponding to the refrigerant's condensation pressure in the condenser and the actual liquid temperature at the condenser outlet during the condensation process. Maintaining a subcooling of 3 to 5 degrees Celsius in the condenser is beneficial for efficient system operation. Plate heat exchanger superheat refers to the degree to which the temperature of the working fluid at the outlet of the plate heat exchanger exceeds its saturation temperature after preheating and evaporation. Studies show that the heat transfer coefficient increases with increasing heat flux density, but decreases when superheat increases.

[0070] Step S222: When the subcooling of the condenser is less than or equal to the preset target subcooling of the condenser, control the second throttle valve to reduce the second opening degree.

[0071] In this embodiment, a preset target subcooling degree of the condenser is obtained. When the subcooling degree of the condenser is less than or equal to the preset target subcooling degree, the second throttle valve is controlled to reduce the second opening degree to reduce the refrigerant flow rate.

[0072] Step S223: When the evaporator superheat is less than or equal to the preset target evaporator superheat, control the third throttle valve to reduce the third opening degree.

[0073] In this embodiment, a preset target superheat of the evaporator is obtained. When the superheat of the evaporator is less than or equal to the preset target superheat of the evaporator, the third throttle valve is controlled to reduce the third opening degree in order to reduce the refrigerant flow.

[0074] Step S224: When the overheat of the plate heat exchanger auxiliary circuit is less than or equal to the preset target overheat of the plate heat exchanger auxiliary circuit, control the fourth throttle valve to reduce the fourth opening degree.

[0075] In this embodiment, a preset target superheat of the plate heat exchanger auxiliary circuit is obtained. When the superheat of the plate heat exchanger auxiliary circuit is less than or equal to the preset target superheat of the plate heat exchanger auxiliary circuit, the fourth throttle valve is controlled to reduce the fourth opening degree to reduce the refrigerant flow.

[0076] The execution order of steps S222, S223 and S224 is not specifically limited; that is, they can be executed simultaneously or in the order they are triggered.

[0077] As an optional implementation, if the detected condenser subcooling is less than or equal to the system-set target subcooling, the controller instructs the second throttle valve to reduce its opening. This increases the refrigerant flow restriction, thereby improving the condenser subcooling and ensuring sufficient subcooling for the liquid refrigerant before it enters the expansion valve. When the evaporator superheat is less than or equal to the preset evaporator target superheat, the controller controls the third throttle valve to reduce its opening. If the detected evaporator superheat is less than or equal to the system-set target superheat, the controller instructs the third throttle valve to reduce its opening. This reduces the amount of refrigerant evaporation, thereby increasing the evaporator superheat, preventing the compressor from drawing in wet vapor, and protecting the compressor from the risk of liquid slugging. When the plate heat exchanger auxiliary circuit superheat is less than or equal to the preset plate heat exchanger auxiliary circuit superheat, the controller controls the fourth throttle valve to reduce its opening. If the detected plate heat exchanger auxiliary circuit superheat is less than or equal to the system-set target superheat, the controller instructs the fourth throttle valve to reduce its opening. Its function is to regulate the refrigerant flow in the auxiliary circuit of the plate heat exchanger to maintain appropriate superheat and ensure the efficient operation and stability of the system.

[0078] Step S230, and / or, adjust the compressor frequency and fan speed based on the compressor exhaust temperature, the indoor ambient temperature, the outdoor ambient temperature, and the user-set temperature.

[0079] In this embodiment, steps S220 and S230 can be executed simultaneously or separately.

[0080] The exhaust superheat is determined based on the compressor exhaust temperature and the condenser middle pipe temperature. Then, based on the exhaust superheat, indoor ambient temperature, outdoor ambient temperature, and user-set temperature, the compressor frequency and fan speed are determined according to the preset control strategy, and the compressor and fan are controlled to work according to the compressor frequency and fan speed.

[0081] As an optional implementation, indoor and outdoor ambient temperatures are monitored in real time using appropriate temperature sensors and modules. The system receives user-set temperature information and monitors the compressor's exhaust temperature. Based on the acquired evaporator, condenser, and plate heat exchanger temperatures, the required opening degrees of the second, third, and fourth throttle valves are calculated. The controller adjusts the opening degrees of the second, third, and fourth throttle valves accordingly, sending the calculated opening degrees to the corresponding throttle valve actuators to adjust them according to the set opening degrees. The compressor frequency and fan speed are determined based on the compressor exhaust temperature, indoor ambient temperature, outdoor ambient temperature, and user-set temperature. The controller calculates the optimal operating frequency of the compressor and the optimal speed of the fan based on the aforementioned temperature information and the user-set temperature. The control algorithm aims to ensure that the air conditioning system can efficiently reach the user-set temperature while maintaining optimal energy efficiency. The controller sends the calculated compressor frequency and fan speed signals to the compressor and fan control modules, causing them to operate at the set frequency and speed.

[0082] Furthermore, through feedback signals from each throttle valve actuator, the controller monitors the actual opening degree of each throttle valve in real time and compares it with the set opening degree to ensure the accuracy of the adjustment. At the same time, it monitors the actual operating status of the compressor and fan to ensure that they operate at the set frequency and speed.

[0083] The above steps can be cyclically adjusted to achieve continuous and precise control of each component of the air conditioner, ensuring the efficient and stable operation of the system.

[0084] In this embodiment, during heating, the low-boiling-point, high-saturation-pressure components are separated and transported to the evaporation side through the gas-liquid separation effect within the flash evaporator. This alters the refrigerant composition within the evaporator, increasing the enthalpy difference and pressure, thereby enhancing evaporative heat absorption and reducing the compressor pressure ratio. This achieves the effects of increased heat exchange, reduced power consumption, and improved energy efficiency.

[0085] For example, to help understand the technical concept or principle of the air conditioner control method after combining this embodiment with the above-described Embodiments 1 and 2, please refer to Figure 4 , Figure 4 A simplified flowchart of an air conditioner control method is provided, as follows: When starting up for heating, the system detects the indoor ambient temperature, outdoor ambient temperature, and user-set temperature. It determines the compressor superheat based on the condenser temperature and compressor discharge temperature, the evaporator superheat based on the evaporator temperature, and the condenser subcooling based on the condenser mid-pipe temperature and condenser outlet pipe temperature. Then, based on the combination of these parameters, it controls the compressor frequency, indoor and outdoor fan speeds, the second opening of the second throttle valve, and the third opening of the third throttle valve. Specifically, it acquires the evaporator temperature, condenser temperature, indoor ambient temperature, outdoor ambient temperature, user-set temperature, plate heat exchanger temperature, and compressor discharge temperature; adjusts the second opening of the second throttle valve, the third opening of the third throttle valve, and the fourth opening of the fourth throttle valve based on the condenser temperature, evaporator temperature, and plate heat exchanger temperature; and / or determines the compressor frequency and fan speed based on the compressor discharge temperature, indoor ambient temperature, outdoor ambient temperature, and user-set temperature, then controls the compressor and indoor and outdoor fans to operate according to the compressor frequency and fan speed, respectively. Then, based on the temperature of the central tubes of the evaporator and / or the central tubes of the condenser, the first opening of the first throttling valve is adjusted. When the central tube temperature of the condenser is greater than the preset first target temperature of the central tubes, the first throttling valve is increased by n steps and stabilized for m seconds. When the central tube temperature of the condenser is within the closed interval formed by the preset first target temperature and the preset second target temperature of the central tubes, the first throttling valve is maintained at its current opening; wherein the first target temperature of the central tubes is greater than the second target temperature of the central tubes. When the central tube temperature of the evaporator is less than the preset central tube temperature, the first throttling valve is decreased by n steps and stabilized for m seconds. Here, n steps are preset values ​​related to the adjustment opening, and m seconds are preset values ​​related to the adjustment time. This achieves the diversion of the liquid refrigerant output from the condenser, thereby adjusting the ratio of high-boiling-point components and low-boiling-point components in the liquid refrigerant input to the evaporator, and improving the heat exchange efficiency of the evaporator.

[0086] Based on the first and / or second embodiments of this application, in the third embodiment of this application, the content that is the same as or similar to the first and second embodiments described above can be referred to the above description and will not be repeated hereafter. Furthermore, after step S110, the method further includes: controlling the first throttle valve to close during refrigeration operation.

[0087] In this embodiment, the heating process has already been described and will not be repeated. In cooling mode, the compressor's refrigerant outlet is connected to the outdoor heat exchanger via a four-way valve; therefore, the outdoor heat exchanger acts as the condenser, and the indoor heat exchanger acts as the evaporator. (Refer to...) Figure 5 At this time, after the refrigerant is discharged from compressor 1, it passes through four-way valve 2 and enters outdoor heat exchanger 4 for condensation and heat exchange, becoming a subcooled pure liquid. It then passes through third throttle valve 5, but the third throttle valve is fully open, so no throttling effect occurs. The medium-pressure liquid refrigerant enters plate heat exchanger 10, exchanges heat with the low-pressure refrigerant after throttling through fourth throttle valve 7, and then enters flash tank 9. It then passes through second throttle valve 6 for throttling, becoming a low-pressure two-phase refrigerant, which enters indoor heat exchanger 3 for evaporation and heat absorption, and then flows through four-way valve 2. Additionally, one stream of refrigerant is separated from flash tank 9, flows through fourth throttle valve 7, subcools the main refrigerant, absorbs heat to become a low-pressure gaseous refrigerant, and then enters between four-way valve 2 and gas-liquid separator 11, merging with the refrigerant from indoor heat exchanger 3 before entering gas-liquid separator 11 together. Finally, it enters compressor 1 for compression. In cooling mode, first throttle valve 8 is closed.

[0088] In this embodiment, during refrigeration operation, the evaporator temperature, condenser temperature, indoor ambient temperature, outdoor ambient temperature, user-set temperature, compressor discharge temperature, and plate heat exchanger temperature are acquired. Then, based on the condenser temperature, evaporator temperature, and plate heat exchanger temperature, the second opening of the second throttling valve, the third opening of the third throttling valve, and the fourth opening of the fourth throttling valve are adjusted, while the first throttling valve is controlled to close, i.e., its first opening is adjusted to zero. And / or, based on the compressor discharge temperature, indoor ambient temperature, outdoor ambient temperature, and user-set temperature, the compressor frequency and fan speed are adjusted. This achieves a refrigerant circulation process under refrigeration conditions, improving the system's refrigeration efficiency.

[0089] Based on the first, second, and / or third embodiments of this application, the content that is the same as or similar to the above-described embodiments one, two, and three can be referred to the above description and will not be repeated hereafter. In this context, the indoor heat exchanger is connected to the flash evaporator via a first one-way valve, the outdoor heat exchanger is connected to the flash evaporator via a second one-way valve, the plate heat exchanger is connected to the indoor heat exchanger via a third one-way valve, and the plate heat exchanger is connected to the outdoor heat exchanger via a fourth one-way valve. After the step of obtaining the evaporator temperature and / or condenser temperature, the method includes: in heating mode, performing the step of adjusting the first opening degree of the first throttling valve based on the evaporator temperature and / or the condenser temperature; and in cooling mode, performing the step of controlling the first throttling valve to close.

[0090] In this embodiment, refer to Figure 6Four one-way valves are installed between the second throttling valve 6, the flash evaporator 9, the first outlet of the plate heat exchanger 10, and the third throttling valve 5. This allows the indoor heat exchanger 3 to connect to the flash evaporator 9 via the first one-way valve 12, the outdoor heat exchanger 4 to the flash evaporator 9 via the second one-way valve 13, the plate heat exchanger 10 to the indoor heat exchanger 3 via the third one-way valve 14, and the plate heat exchanger 10 to the outdoor heat exchanger 4 via the fourth one-way valve 15.

[0091] In heating mode, after the refrigerant is discharged from compressor 1, it passes through four-way valve 2 and enters indoor heat exchanger 3 for condensation and heat exchange, becoming a subcooled pure liquid. Then, it undergoes a first throttling process through second throttling valve 6, becoming a medium-pressure flash vapor-liquid two-phase state. At this point, the medium-pressure flash vapor-liquid two-phase refrigerant enters flash evaporator 9 through first one-way valve 12, where gas-liquid separation occurs. The gaseous portion contains a higher proportion of low-boiling-point refrigerant, while the liquid portion contains a higher proportion of high-boiling-point refrigerant. The gaseous refrigerant flowing out of flash evaporator 9 is designated as path D. The liquid refrigerant is divided into two paths: path B and path D mix to form path C, which then enters plate heat exchanger 10. The liquid refrigerant in path B has its flow rate controlled by first throttling valve 8. Path A flows through fourth throttling valve 7, becoming low-pressure refrigerant, and enters plate heat exchanger 10, where it exchanges heat with path C refrigerant. This process subcools path C refrigerant into a pure liquid state, while path A absorbs heat and becomes superheated. The pure liquid refrigerant in circuit C flows through the fourth one-way valve 15 and then through the third throttling valve 5 to reduce its pressure to a low pressure. It then enters the outdoor heat exchanger 4 for evaporative heat exchange, and finally passes through the four-way valve 2 into the gas-liquid separator 11. Circuit A absorbs heat in the plate heat exchanger 10 and then enters between the four-way valve 2 and the gas-liquid separator 11, where it merges with circuit C and enters the gas-liquid separator 11. Finally, it enters the compressor 1 for compression.

[0092] In refrigeration mode, the refrigerant outlet of compressor 1 is connected to outdoor heat exchanger 4 via four-way valve 2. Therefore, outdoor heat exchanger 4 acts as a condenser, and indoor heat exchanger 3 acts as an evaporator. At this time, after the refrigerant is discharged from compressor 1, it passes through four-way valve 2 and enters indoor heat exchanger 4 for condensation and heat exchange, becoming a subcooled pure liquid. It then passes through third throttle valve 5, but the third throttle valve is fully open, so no throttling effect occurs. The medium-pressure liquid refrigerant enters flash evaporator 9 through second one-way valve 13, where gas-liquid separation occurs. The gaseous portion contains a higher proportion of low-boiling-point refrigerant, while the liquid portion contains a higher proportion of high-boiling-point refrigerant. The gaseous refrigerant flowing out of flash evaporator 9 is named D-path, and the liquid refrigerant is divided into two paths: B-path and D-path mix to form C-path, which then enters plate heat exchanger 10. The liquid refrigerant in path B has its flow rate controlled by first throttle valve 8. Refrigerant A flows through the fourth throttle valve 7, becoming low-pressure refrigerant, and enters the plate heat exchanger 10. There, it exchanges heat with refrigerant C, causing C to become subcooled and pure liquid, while A absorbs heat and becomes superheated. The pure liquid refrigerant in C passes through the third one-way valve 14 and then the second throttle valve 6, becoming low-pressure two-phase refrigerant. This refrigerant then enters the indoor heat exchanger 3 for evaporation and heat absorption, before flowing through the four-way valve 2. Additionally, one stream of refrigerant is separated from the flash tank 9, flowing through the fourth throttle valve 7 to subcool the main refrigerant. After absorbing heat and becoming low-pressure gaseous refrigerant, it enters between the four-way valve 2 and the gas-liquid separator 11, merging with the refrigerant from the indoor heat exchanger 3 before entering the gas-liquid separator 11 together. Finally, it enters the compressor 1 for compression.

[0093] Based on the air conditioner in this embodiment, in heating mode, the step of adjusting the first opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature is performed.

[0094] That is, perform the relevant steps as in the heating condition in the first and second embodiments.

[0095] Based on the air conditioner in this embodiment, when in cooling mode, the step of controlling the first throttle valve to close as described in embodiment three is executed.

[0096] For example, in cooling mode, the system acquires the evaporator temperature, condenser temperature, indoor ambient temperature, outdoor ambient temperature, user-set temperature, compressor discharge temperature, and plate heat exchanger temperature. Then, based on the condenser temperature, evaporator temperature, and plate heat exchanger temperature, it adjusts the second opening of the second throttling valve, the third opening of the third throttling valve, and the fourth opening of the fourth throttling valve, controlling the first throttling valve to close, i.e., adjusting the first opening to zero; and / or, based on the compressor discharge temperature, indoor ambient temperature, outdoor ambient temperature, and user-set temperature, it adjusts the compressor frequency and fan speed. This achieves a refrigerant circulation process in cooling mode, improving the system's cooling efficiency.

[0097] In one embodiment, the air conditioner includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 4, a third throttle valve 5, a plate heat exchanger 10, a flash evaporator 9, a second throttle valve 6, an indoor heat exchanger 3, a fourth throttle valve 7, and a first throttle valve 8. The compressor 1, the four-way valve 2, the outdoor heat exchanger 4, the third throttle valve 5, the first heat exchange passage of the plate heat exchanger 10, the flash evaporator 9, the second throttle valve 6, and the indoor heat exchanger 4 are sequentially connected to form a main circuit. The liquid refrigerant outlet of the flash evaporator 9 is sequentially connected to the fourth throttle valve 7, the second heat exchange passage of the plate heat exchanger 10, and the return or makeup air port of the compressor 1 to form a first auxiliary branch. One end of the first throttle valve 8 is connected in the first auxiliary branch between the liquid refrigerant outlet of the flash evaporator 9 and the fourth throttle valve 7, and the other end of the first throttle valve 8 is connected in the main circuit between the flash evaporator 9 and the plate heat exchanger 10.

[0098] The air conditioner has a first throttling valve 8 installed in the first flow channel between the liquid refrigerant outlet of the flash evaporator 9 and the first inlet of the plate heat exchanger 10. The first opening degree of the first throttling valve 8 is then adjusted based on the evaporator temperature and / or condenser temperature, thereby adjusting the refrigerant composition entering the evaporator. This overcomes the technical defect that when liquid refrigerant rich in high-boiling-point components enters the evaporator, the high-boiling-point substances are not easy to evaporate, which leads to uneven temperature distribution inside the evaporator and affects heat exchange efficiency. This achieves the purpose of changing the refrigerant composition inside the evaporator, increasing the enthalpy difference and pressure inside the evaporator, increasing the heat absorption of evaporation, reducing the compressor pressure ratio, and achieving the technical effects of increased heat exchange, reduced power, and improved energy efficiency.

[0099] This application provides a control device for an air conditioner, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the control method for the air conditioner in the first embodiment described above.

[0100] The following is for reference. Figure 7 The diagram illustrates a structural schematic of a control device suitable for implementing the air conditioner embodiments of this application. The control device for the air conditioner in these embodiments 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 7The control device of the air conditioner shown is merely an example and should not impose any limitation on the function and scope of use of the embodiments of this application.

[0101] like Figure 7 As shown, the control device of the air conditioner may include a processing unit 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the air conditioner's control device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the air conditioner's control equipment to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows control equipment for an air conditioner with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented alternatively.

[0102] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, 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 flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0103] The air conditioner control device provided in this application, employing the air conditioner control method described in the above embodiments, can solve the technical problem that liquid refrigerant rich in high-boiling-point components is difficult to evaporate in the evaporator, affecting heat exchange efficiency. Compared with the prior art, the beneficial effects of the air conditioner control device provided in this application are the same as those of the air conditioner control device provided in the above embodiments, and other technical features in the air conditioner control device are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0104] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. 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.

[0105] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology 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.

[0106] 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.

[0107] 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.

[0108] The aforementioned computer-readable storage medium may be included in the control device of the air conditioner; or it may exist independently and not be assembled into the control device of the air conditioner.

[0109] The aforementioned computer-readable storage medium carries one or more programs that, when executed by the control device of the air conditioner, cause the control device of the air conditioner to: acquire the evaporator temperature and / or the condenser temperature; Adjust the first opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature.

[0110] 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).

[0111] 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.

[0112] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0113] 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 that liquid refrigerant rich in high-boiling-point components is difficult to evaporate in the evaporator, affecting heat exchange efficiency. 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.

[0114] This application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the air conditioner control method described above.

[0115] The computer program product provided in this application can solve the technical problem of how to improve the heat dissipation efficiency of PCS energy storage systems. Compared with the prior art, the beneficial effects of the computer program product provided in the embodiments of this application are the same as the beneficial effects of the air conditioner control method provided in the above embodiments, and will not be repeated here.

[0116] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, a third throttle valve, a plate heat exchanger, a flash evaporator, a second throttle valve, an indoor heat exchanger, a fourth throttle valve, and a first throttle valve. The compressor, the four-way valve, the outdoor heat exchanger, the third throttle valve, the first heat exchange passage of the plate heat exchanger, the flash evaporator, the second throttle valve, and the indoor heat exchanger are sequentially connected to form a main circuit. The liquid refrigerant outlet of the flash evaporator is sequentially connected to the fourth throttle valve, the second heat exchange passage of the plate heat exchanger, and the return or makeup air port of the compressor to form a first auxiliary branch. One end of the first throttling valve is connected to the first auxiliary branch between the liquid refrigerant outlet of the flash evaporator and the fourth throttling valve, and the other end of the first throttling valve is connected to the main circuit between the flash evaporator and the plate heat exchanger. The liquid refrigerant outlet of the flash evaporator is connected to the first inlet and the second inlet of the plate heat exchanger through a first flow channel and a second flow channel, respectively. When the air conditioner is operating in heating mode, the gaseous refrigerant outlet of the flash evaporator is connected to the first inlet through a third flow channel. A first throttling valve is provided on the first flow channel. The method includes: When the air conditioner is running in heating mode, the evaporator temperature and / or condenser temperature are obtained; Adjust the first opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature.

2. The method as described in claim 1, characterized in that, The step of determining the opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature includes: When the temperature of the tube in the middle of the condenser is greater than the preset first target temperature in the middle of the condenser, the first throttle valve is controlled to increase the first opening degree.

3. The method as described in claim 1, characterized in that, The step of determining the opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature includes: When the condenser temperature, specifically the pipe temperature in the middle of the condenser, falls within the closed range formed by the preset first target temperature in the middle of the condenser and the preset second target temperature in the middle of the condenser, the first throttle valve is controlled to maintain its current opening. The first target temperature in the middle of the condenser is greater than the second target temperature in the middle of the condenser.

4. The method as described in claim 1, characterized in that, The step of determining the opening degree of the first throttle valve based on the evaporator temperature and / or the condenser temperature includes: When the temperature of the pipe in the middle of the evaporator is lower than the preset temperature of the middle of the evaporator, the first throttle valve is controlled to reduce the first opening degree.

5. The method as described in claim 1, characterized in that, Prior to the step of adjusting the first opening of the first throttle valve based on the evaporator temperature and / or the condenser temperature, the following steps are included: It acquires indoor ambient temperature, outdoor ambient temperature, user-set temperature, and compressor discharge temperature; Adjust the second opening of the second throttle valve, the third opening of the third throttle valve, and the fourth opening of the fourth throttle valve based on the condenser temperature, the evaporator temperature, and the plate heat exchanger temperature; and / or, The compressor frequency and fan speed are adjusted based on the compressor exhaust temperature, the indoor ambient temperature, the outdoor ambient temperature, and the user-set temperature.

6. The method as described in claim 5, characterized in that, The adjustment of the second opening degree of the second throttle valve, the third opening degree of the third throttle valve, and the fourth opening degree of the fourth throttle valve based on the condenser temperature, the evaporator temperature, and the plate heat exchanger temperature includes: Determine the evaporator superheat corresponding to the evaporator temperature, the condenser subcooling corresponding to the condenser temperature, and the plate heat exchanger auxiliary circuit superheat corresponding to the plate heat exchanger temperature. When the condenser subcooling is less than or equal to the preset target condenser subcooling, the second throttle valve is controlled to reduce the second opening degree; When the evaporator superheat is less than or equal to the preset target evaporator superheat, the third throttle valve is controlled to reduce the third opening degree. When the overheat of the plate heat exchanger auxiliary circuit is less than or equal to the preset target overheat of the plate heat exchanger auxiliary circuit, the fourth throttle valve is controlled to reduce the fourth opening degree.

7. A control device for an air conditioner, characterized in that, The control device of the air conditioner includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method of the air conditioner as described in any one of claims 1 to 6.

8. A storage medium, characterized in that, The storage medium 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 control method for the air conditioner as described in any one of claims 1 to 6.

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