Method and device for determining air suction dryness of compressor, air conditioner and storage medium

Abstract

The invention discloses an air suction dryness determining method and device of a compressor, an air conditioner and a storage medium, and relates to the technical field of heat pumps. The method comprises the steps that the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference air suction dryness are obtained; and the actual air suction dryness of the compressor is determined according to the actual exhaust temperature, the theoretical exhaust temperature and the reference air suction dryness. The air suction dryness of the compressor is accurately detected, so that the control accuracy of a system where the compressor is located is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat pumps, and particularly to a method for determining the suction dryness of a compressor, a device for determining the suction dryness, an air conditioner, and a storage medium. Background Art

[0002] When a refrigerant such as R32 is charged in a heat pump system such as an air conditioner, the compressor needs to maintain a certain liquid-carrying state during suction to avoid excessive temperature during the compression process of the compressor.

[0003] In the related art, when the compressor sucks liquid, the suction dryness needs to be controlled within a suitable range. When the suction dryness is too low, liquid slugging of the compressor will occur, and when the suction dryness is too high, the compressor temperature will be too high. However, the actual suction dryness of the compressor cannot be directly detected, resulting in the inability to directly apply the actual suction dryness control system for operation, which affects the control accuracy of the system. Summary of the Invention

[0004] The main purpose of the present application is to provide a method for determining the suction dryness of a compressor, a device for determining the suction dryness, an air conditioner, and a storage medium, aiming to accurately detect the suction dryness of the compressor to improve the control accuracy of the system where the compressor is located.

[0005] To achieve the above object, the present application proposes a method for determining the suction dryness of a compressor, and the method includes:

[0006] Obtain the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference suction dryness;

[0007] Determine the actual suction dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness.

[0008] In one embodiment, the reference suction dryness is a critical value for distinguishing whether the refrigerant carries liquid during suction. The step of determining the actual suction dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness includes:

[0009] When the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is less than or equal to a preset threshold, determine that the reference suction dryness is the actual suction dryness.

[0010] In one embodiment, the step of determining the actual suction dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness includes:

[0011] When the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is greater than the preset threshold, adjust the reference suction dryness according to the theoretical exhaust temperature and the actual exhaust temperature.

[0012] Return to execute the step of obtaining the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference suction dryness.

[0013] In one embodiment, the step of adjusting the reference suction dryness according to the theoretical exhaust temperature and the actual exhaust temperature includes:

[0014] When the actual exhaust temperature is less than the theoretical exhaust temperature, reduce the reference suction dryness;

[0015] When the actual exhaust temperature is greater than the theoretical exhaust temperature, increase the reference suction dryness.

[0016] In one embodiment, the step of obtaining the theoretical exhaust temperature corresponding to the reference suction dryness includes:

[0017] Obtain the structural characteristic parameters and operating condition parameters of the compressor;

[0018] Determine the theoretical exhaust temperature corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters.

[0019] In one embodiment, the step of determining the theoretical exhaust temperature corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters includes:

[0020] Determine the flow rate of the compressor, the power of the compressor, the heat dissipation between the compressor and the environment, and the suction enthalpy value corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters;

[0021] Determine the theoretical exhaust enthalpy value of the compressor according to the suction enthalpy value, the flow rate, the power, and the heat dissipation;

[0022] Determine the theoretical exhaust temperature according to the theoretical exhaust enthalpy value.

[0023] In one embodiment, the operating condition parameters include the suction pressure, the exhaust pressure, the operating frequency, the exhaust temperature, and the ambient temperature. The step of determining the flow rate of the compressor, the power of the compressor, the heat dissipation between the compressor and the environment, and the suction enthalpy value corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters includes:

[0024] Determine the suction density and the suction enthalpy value of the compressor according to the suction pressure;

[0025] Determine the flow rate and the power according to the suction pressure, the exhaust pressure, the operating frequency, and the suction density, and determine the heat dissipation according to the exhaust temperature, the ambient temperature, and the structural characteristic parameters.

[0026] In one embodiment, the structural characteristic parameters include the outer surface area of the housing, the convective heat transfer coefficient of the housing, and the emissivity of the housing; and / or, the step of determining the flow rate and the power according to the suction pressure, the exhaust pressure, the operating frequency, and the suction density includes:

[0027] Determine the isentropic compression power of the compressor according to the reference suction dryness, the suction pressure, and the exhaust pressure, and determine the volumetric efficiency and the isentropic efficiency of the compressor according to the suction pressure, the exhaust pressure, and the operating frequency;

[0028] Determine the flow rate of the compressor according to the suction density, the operating frequency, and the volumetric efficiency, and determine the power according to the isentropic efficiency and the isentropic compression power.

[0029] In addition, to achieve the above object, the present application also provides an apparatus for determining suction dryness, which includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the method for determining the suction dryness of the compressor as described above.

[0030] In addition, to achieve the above object, the present application also provides an air conditioner, which includes a compressor and the apparatus for determining suction dryness as described above, an exhaust detection module is provided on the exhaust side of the compressor, and the exhaust detection module is communicatively connected to the apparatus for determining suction dryness.

[0031] In addition, to achieve the above object, the present application also provides a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, it implements the steps of the method for determining the suction dryness of the compressor as described above.

[0032] One or more technical solutions proposed by the present application have at least the following technical effects: This solution determines the actual suction dryness of the compressor based on the actual exhaust temperature of the compressor, the reference suction dryness, and the corresponding theoretical exhaust temperature. Based on this, the suction dryness of the compressor can be accurately detected based on the exhaust temperature of the compressor, so as to improve the control accuracy of the system where the compressor is located. Description of the Drawings

[0033] The accompanying drawings here are incorporated into the description and form a part of this description, showing embodiments in line with this application, and are used together with the description to explain the principles of this application.

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic diagram of the device structure of the hardware operating environment involved in the method for determining the suction dryness of a compressor in an embodiment of this application;

[0036] Figure 2 It is a schematic flowchart provided by Embodiment 1 of the method for determining the suction dryness of a compressor in this application;

[0037] Figure 3 It is a schematic flowchart of an implementation manner of step S20 in the method for determining the suction dryness of a compressor in this application;

[0038] Figure 4 It is a schematic flowchart provided by Embodiment 2 of the method for determining the suction dryness of a compressor in this application.

[0039] The realization of the purpose, functional features, and advantages of this application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific Embodiments

[0040] It should be understood that the specific embodiments described here are only used to explain the technical solutions of this application and are not used to limit this application.

[0041] To better understand the technical solutions of this application, the following will be described in detail in conjunction with the accompanying drawings of the description and specific implementation manners.

[0042] The main solution of the embodiment of this application is: obtaining the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference suction dryness; determining the actual suction dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness.

[0043] In this embodiment, for the convenience of description, the following will be described with the device for determining the suction dryness of a compressor as the execution subject.

[0044] In the related art, when the compressor sucks in liquid, the suction dryness needs to be controlled within a suitable range. When the suction dryness is too low, liquid slugging of the compressor will occur, and when the suction dryness is too high, the temperature of the compressor will be too high. However, the actual suction dryness of the compressor cannot be directly detected, resulting in the inability to directly apply the actual suction dryness control system for operation, which affects the control accuracy of the system.

[0045] The present application provides the above solution. Based on the actual exhaust temperature of the compressor, the reference suction dryness, and the corresponding theoretical exhaust temperature, the actual suction dryness of the compressor is determined. Based on this, the suction dryness of the compressor can be accurately detected based on the exhaust temperature of the compressor, so as to improve the control accuracy of the system where the compressor is located.

[0046] The present application proposes a suction dryness determination device 100.

[0047] In this embodiment, the suction dryness determination device 100 is built into the heat pump system (such as an air conditioner, etc.) where the compressor is located. In other embodiments, the suction dryness determination device 100 can also be arranged independently of the heat pump system where the compressor is located.

[0048] Among them, with reference to Figure 1 , the suction dryness determination device 100 includes: at least one processor 1001; and a memory 1002 communicatively connected to the at least one processor 1001, and a timer 1003, etc.; wherein, the memory 1002 stores instructions executable by the at least one processor 1001, and the instructions are executed by the at least one processor 1001, so that the at least one processor 1001 can execute the method for determining the suction dryness of the compressor in the following embodiments.

[0049] Next, with reference to Figure 1 , which shows a schematic structural diagram of a control device 100 suitable for implementing the embodiments of the present application. The suction dryness determination device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, tablet computers, vehicle-mounted terminals, etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 1 The shown suction dryness determination device 100 is merely an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0050] As Figure 1As shown, the suction dryness determination device 100 may include a processor 1001 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the programs stored in the memory 1002. Here, the programs in the memory 1002 can be programs in a read-only memory (ROM: Read Only Memory) or programs loaded from a storage device into a random access memory (RAM: Random Access Memory). In the RAM, various programs and data required for controlling the operation of the device 100 are also stored. The processor 1001 and the memory 1002 (ROM and RAM) are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus. Generally, the following systems can be connected to the I / O interface: input devices including, for example, a temperature sensor, a pressure sensor, an environment detection module, etc.; output devices including, for example, a liquid crystal display (LCD: LiquidCrystal Display), a speaker, a vibrator, etc.; storage devices including, for example, a magnetic tape, a hard disk, etc.; and a communication device. The communication device can allow the suction dryness determination device 100 to communicate with other devices wirelessly or wiredly to exchange data. Although the suction dryness determination device 100 with various systems is shown in the figure, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems can be implemented or had alternatively.

[0051] Particularly, according to the embodiments disclosed in the present application, the method flows described in the following embodiments can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network through the communication device, or installed from the memory 1002. When the computer program is executed by the processor 1001, the above functions defined in the suction dryness determination method of the compressor in the embodiments disclosed in the present application are executed.

[0052] The suction dryness determination device provided by the present application adopts the suction dryness determination method of the compressor in the following embodiments, and can solve the technical problem of how to accurately detect the suction dryness of the compressor to improve the control accuracy of the system where the compressor is located. Compared with the prior art, the beneficial effects of the suction dryness determination device provided by the present application are the same as those of the suction dryness determination method of the compressor provided by the following embodiments, and other technical features in the suction dryness determination device are the same as those disclosed in the method of the following embodiments, and will not be elaborated here.

[0053] The present application also provides an air conditioner. The air conditioner can be any type of air conditioner such as a wall-mounted air conditioner, a window air conditioner, a ceiling-mounted air conditioner, a floor-standing air conditioner, a multi-connected air conditioner, a mobile air conditioner, etc.

[0054] In this embodiment, the air conditioner includes a refrigerant circulation circuit and the above-mentioned suction dryness determination device 100. The refrigerant circulation circuit may include a compressor 2, a reversing component (such as a four-way valve, etc.), and a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence. The exhaust port of the compressor 2, the suction port of the compressor 2, the first heat exchanger, and the second heat exchanger are all connected to the reversing component.

[0055] Refer to Figure 1 , the compressor 2 can be connected to the suction dryness determination device 100, and the suction dryness determination device 100 can obtain the operating frequency of the compressor 2.

[0056] Refer to Figure 1 , an exhaust detection module 3 is provided on the exhaust side of the compressor 2, and the exhaust detection module 3 is communicatively connected to the suction dryness determination device 100. In this embodiment, the exhaust detection module 3 includes an exhaust temperature sensor and an exhaust pressure sensor. The exhaust temperature sensor is used to detect the exhaust temperature of the compressor 2, and the exhaust pressure sensor is used to detect the exhaust pressure of the compressor 2.

[0057] Refer to Figure 1 , the air conditioner further includes an environment detection module 4 provided in its environment, and the environment detection module 4 is communicatively connected to the suction dryness determination device 100. The environment detection module 4 can be used to detect environmental parameters (at least one of environmental temperature, environmental humidity, environmental enthalpy value, etc.) of the environment where the air conditioner is located.

[0058] Refer to Figure 1 , the air conditioner further includes a suction detection module 5, and the suction detection module 5 is communicatively connected to the suction dryness determination device 100. The suction detection module 5 can be used to detect the suction temperature and / or suction pressure of the compressor 2, etc.

[0059] The air conditioner provided by the present application, based on the above-mentioned suction dryness determination device 100, adopts the compressor suction dryness determination method in the following embodiment, and can solve the technical problem of how to accurately detect the suction dryness of the compressor to improve the control accuracy of the air conditioner. Compared with the prior art, the beneficial effects of the suction dryness determination device 100 provided by the present application are the same as those of the compressor suction dryness determination method provided by the following embodiment, and other technical features in the suction dryness determination device 100 are the same as the features disclosed in the following embodiment method, and will not be elaborated here.

[0060] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, an intake dryness determination device, etc. that can implement the above functions. Hereinafter, taking the intake dryness determination device as an example, this embodiment and the following embodiments will be described.

[0061] Based on this, an embodiment of the present application provides a method for determining the intake dryness of a compressor. Refer to Figure 2 , Figure 2 which is a schematic flowchart of the first embodiment of the method for determining the intake dryness of the compressor of the present application.

[0062] In this embodiment, the method for determining the intake dryness of the compressor includes steps S10 to S20:

[0063] Step S10, obtaining the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference intake dryness;

[0064] The actual exhaust temperature is the actual temperature detected by the exhaust temperature sensor on the exhaust side of the compressor.

[0065] The intake dryness is the proportion of the gaseous refrigerant in the refrigerant flowing back to the compressor. The reference intake dryness is a preset intake dryness, and the reference intake dryness can be a fixed value set in advance; alternatively, the reference intake dryness can also be a parameter value determined according to the actual operating conditions of the compressor. For example, the reference intake dryness can be determined according to the current operating frequency of the compressor and / or the current opening of the throttling device, etc. Based on this, it is beneficial to improve the efficiency of obtaining the accurate actual intake dryness.

[0066] The theoretical exhaust temperature is the theoretical value of the exhaust temperature of the compressor when the actual intake dryness of the compressor is the reference intake dryness.

[0067] Among them, the corresponding relationship between the reference intake dryness and the theoretical exhaust temperature can be a fixed relationship set in advance (which can include a quantitative relationship or a mapping relationship, etc.). Based on this corresponding relationship, the theoretical exhaust temperature corresponding to the reference intake dryness can be determined.

[0068] It should be noted that step S10 is executed when the compressor is in an open state.

[0069] Step S20, determining the actual intake dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference intake dryness.

[0070] In one implementation, determine the first relationship (size relationship or quantitative relationship, etc.) between the actual exhaust temperature and the theoretical exhaust temperature, and determine the actual intake dryness based on the first relationship and the reference intake dryness.

[0071] In another implementation, a second relationship (such as a ratio or an algorithm model, etc.) between the reference suction dryness and the theoretical exhaust temperature can be determined, and the actual suction dryness is determined based on the second relationship and the actual exhaust temperature. For example, the product of the ratio between the reference suction dryness and the theoretical exhaust temperature and the actual exhaust temperature is used as the actual suction dryness.

[0072] This embodiment provides a method for determining the suction dryness of a compressor. The actual suction dryness of the compressor is determined based on the actual exhaust temperature of the compressor, the reference suction dryness, and its corresponding theoretical exhaust temperature. Based on this, the suction dryness of the compressor can be accurately detected based on the exhaust temperature of the compressor, so as to improve the control accuracy of the system where the compressor is located.

[0073] In a feasible implementation, the reference suction dryness is the critical value for distinguishing whether there is liquid in the refrigerant. In this embodiment, the reference suction dryness is 1, and at this time, the refrigerant at the suction position of the compressor is in a just superheated state. It should be noted that this critical value is the initial value of the reference suction dryness. If the reference suction dryness needs to be adjusted later, the adjusted reference suction dryness can be greater than or less than the critical value. In this embodiment, referring to Figure 3 , step S20 includes:

[0074] Step S21, determining whether the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is less than or equal to a preset threshold;

[0075] When the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is less than or equal to the preset threshold, step S22 is executed; when the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is greater than the preset threshold, step S23 is executed and then step S10 is executed again.

[0076] In this embodiment, the temperature deviation value is the absolute value of the difference between the theoretical exhaust temperature and the actual exhaust temperature.

[0077] The preset threshold can be a preset fixed value, or a preset threshold determined according to the operating mode of the air conditioner where the compressor is located. Different operating modes can correspond to different preset thresholds. For example, different preset thresholds correspond to the refrigeration mode, the heating mode, the defrosting mode, and the oil return mode respectively. Among them, the risk of liquid hammer and the risk of overheating of the compressor in different operating modes are different, so the accuracy requirements for detecting the suction dryness are different. Therefore, setting different preset thresholds for different operating modes is beneficial to further improve the accuracy of suction dryness detection, thereby further improving the control accuracy of the system where the compressor is located.

[0078] Step S22, determining the reference suction dryness as the actual suction dryness;

[0079] Step S23, adjust the reference suction dryness according to the theoretical exhaust temperature and the actual exhaust temperature.

[0080] Determine the magnitude relationship and / or quantitative relationship (such as ratio or difference, etc.) between the theoretical exhaust temperature and the actual exhaust temperature, and determine whether to increase or decrease the reference suction dryness based on the magnitude relationship and / or quantitative relationship.

[0081] In this embodiment, when the actual exhaust temperature is less than the theoretical exhaust temperature, the reference suction dryness is decreased; when the actual exhaust temperature is greater than the theoretical exhaust temperature, the reference suction dryness is increased.

[0082] Among them, when the actual exhaust temperature is less than the theoretical exhaust temperature, it indicates that the compressor is in the state of liquid-carrying suction; when the actual exhaust temperature is greater than the theoretical exhaust temperature, it indicates that the compressor is in the state of suction superheat. The dryness adjustment value during the process of decreasing or increasing the reference suction dryness can be a preset fixed value, or a value determined according to the actual operating conditions of the compressor. For example, the opening adjustment value can be determined according to the temperature deviation value and / or the operating frequency of the compressor and / or the opening of the throttling device in the refrigerant circulation loop where the compressor is located.

[0083] In this embodiment, when the temperature deviation value is less than the preset threshold, it can be considered that the reference suction dryness conforms to the actual suction condition of the compressor. At this time, the reference suction dryness is used as the actual suction dryness, and the accurate actual suction dryness of the compressor can be obtained; when the temperature deviation value is greater than the preset threshold, it indicates that the reference suction dryness deviates greatly from the actual suction state of the compressor. At this time, it is suitable to iteratively adjust the reference suction dryness according to the theoretical exhaust temperature and the actual exhaust temperature until the temperature deviation value is less than the preset threshold, so as to ensure that the accurate actual suction dryness of the compressor can be obtained. Based on this, through the above method, the accurate detection of the actual suction dryness of the compressor can be realized. Among them, when the temperature deviation value is greater than the preset threshold, the reference suction dryness is adjusted in different directions according to the states of suction superheat or liquid-carrying suction of the compressor characterized by the theoretical exhaust temperature and the actual exhaust temperature, which is beneficial to finding the accurate actual suction dryness in a step-by-step optimization manner and further improving the accuracy of the actual suction dryness detection of the compressor.

[0084] In other embodiments, when the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is greater than the preset threshold, the dryness adjustment value can also be determined according to the difference between the theoretical exhaust temperature and the actual temperature, and the reference suction dryness is adjusted according to the dryness adjustment value to obtain the actual suction dryness.

[0085] Based on any of the above embodiments, in the second embodiment of the present application, for the same or similar content as in the above embodiments, reference may be made to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 4 to obtain the theoretical exhaust temperature corresponding to the reference suction dryness, including:

[0086] Step S11: Obtain the structural characteristic parameters and operating condition parameters of the compressor;

[0087] The structural characteristic parameters are the characteristic parameters reflecting the structural attributes of the compressor itself and are parameters that do not change due to external factors. The structural characteristic parameters may include at least one of the following: cylinder volume, outer surface area of the housing, convective heat transfer coefficient of the housing, emissivity of the housing, etc. The structural characteristic parameters can be obtained by reading the parameters pre-stored in the memory.

[0088] The operating condition parameters are the characteristic parameters reflecting the operating state of the compressor and can reflect its own operating state parameters and / or the environmental state parameters where it is located. The operating condition parameters may include at least one of the following: suction pressure, suction density, discharge pressure, operating frequency, exhaust temperature, ambient temperature, etc. The operating condition parameters can be detected by the above detection module.

[0089] Step S12: Determine the theoretical exhaust temperature corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters.

[0090] In one implementation, a first correspondence (which may include forms such as a mapping relationship, a calculation formula, an algorithm model, etc.) between the structural characteristic parameters, the operating condition parameters, the reference suction dryness, and the theoretical exhaust temperature may be established in advance. Based on the first correspondence, the theoretical exhaust temperature corresponding to the current structural characteristic parameters, operating condition parameters, and reference suction dryness can be determined. In this embodiment, the first correspondence can be determined according to the suction state of the compressor (suction superheat state or suction liquid-carrying state), and different suction states correspond to different first correspondences.

[0091] In another implementation, a second correspondence (which may include forms such as a mapping relationship, a calculation formula, an algorithm model, etc.) between the structural characteristic parameters, the operating condition parameters, and the theoretical exhaust temperature can be obtained with reference to the suction dryness. Different reference suction dryness values may correspond to different second correspondences. Based on the second correspondence, the theoretical exhaust temperature corresponding to the current structural characteristic parameters and operating condition parameters can be determined. In this embodiment, different suction states (suction superheat state or suction liquid-carrying state) of the compressor result in different second correspondences for the same reference suction dryness.

[0092] In this embodiment, by combining the structural characteristic parameters and the operating condition parameters, the theoretical exhaust temperature corresponding to the accurate reference exhaust dryness can be obtained, which is beneficial to further improving the accuracy of the actually measured suction dryness subsequently.

[0093] In other embodiments, a preset correspondence between the operating condition parameters and the theoretical exhaust temperature can also be established based on the structural characteristic parameters. Then, the operating condition parameters can be obtained without obtaining the structural characteristic parameters, and the theoretical exhaust temperature can be determined based on the operating condition parameters and the preset correspondence.

[0094] In a feasible implementation manner, step S12 includes: determining the flow rate of the compressor, the power of the compressor, the heat dissipation between the compressor and the environment, and the suction enthalpy value corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters; determining the theoretical exhaust enthalpy value of the compressor according to the suction enthalpy value, the flow rate, the power, and the heat dissipation; and determining the theoretical exhaust temperature according to the theoretical exhaust enthalpy value.

[0095] In this embodiment, the operating condition parameters include the suction pressure, the exhaust pressure, the operating frequency, the exhaust temperature, and the ambient temperature. Then, the suction density and the suction enthalpy value of the compressor are determined according to the suction pressure; the flow rate and the power are determined according to the suction pressure, the exhaust pressure, the operating frequency, and the suction density; and the heat dissipation is determined according to the exhaust temperature, the ambient temperature, and the structural characteristic parameters.

[0096] In this embodiment, the suction density and the suction enthalpy value are determined according to the suction pressure and the reference suction dryness. In some other implementation manners, the suction density and the suction enthalpy value can be determined according to the pressure range where the suction pressure is located.

[0097] In this embodiment, the process of determining the flow rate and the power is as follows: the isentropic compression power of the compressor is determined according to the reference suction dryness, the suction pressure, and the exhaust pressure; the volumetric efficiency and the isentropic efficiency of the compressor are determined according to the suction pressure, the exhaust pressure, and the operating frequency; the flow rate of the compressor is determined according to the suction density, the operating frequency, and the volumetric efficiency; and the power is determined according to the isentropic efficiency and the isentropic compression power. Among them, when determining the flow rate of the compressor, the flow rate of the compressor can be determined according to the suction density, the operating frequency, the volumetric efficiency, and the cylinder volume of the compressor. In some other implementation manners, the flow rate and the power of the compressor can also be determined according to the first pressure range where the suction pressure is located, the second pressure range where the exhaust pressure is located, and the frequency range where the operating frequency of the compressor is located.

[0098] In this embodiment, the structural characteristic parameters include the outer surface area of the housing, the convective heat transfer coefficient of the housing, and the emissivity of the housing. The process of determining the heat dissipation amount is as follows: Determine the first unit heat dissipation amount according to the temperature difference between the exhaust gas temperature and the ambient temperature and the convective heat transfer coefficient; determine the second unit heat dissipation amount according to the difference between the product of a preset number of exhaust gas temperatures and the product of a preset number of ambient temperatures, the emissivity of the housing, and the Stefan-Boltzmann constant; determine the target unit heat dissipation amount according to the first unit heat dissipation amount and the second unit heat dissipation amount; and use the product of the target unit heat dissipation amount and the outer surface area of the housing as the heat dissipation amount between the compressor and the environment. In other implementation manners, the heat dissipation amount can also be determined according to the exhaust gas temperature, the preset heat transfer temperature difference, and the structural characteristic parameters.

[0099] In this embodiment, the process of determining the theoretical exhaust enthalpy value is as follows: Determine the difference between the power and the heat dissipation amount between the compressor and the environment; determine the enthalpy change value during the compression process of the compressor according to the ratio of the difference to the flow rate; and determine the sum value of the enthalpy change value and the suction enthalpy value as the theoretical exhaust enthalpy value.

[0100] In this embodiment, during the process of determining the theoretical exhaust gas temperature, the theoretical exhaust gas temperature can be determined according to the theoretical exhaust enthalpy value and the exhaust gas pressure. The exhaust gas pressure can be the pressure detected in the operating condition parameters, or can also be the pressure value determined according to the reference suction dryness.

[0101] In this embodiment, through the above method, the theoretical exhaust gas temperature corresponding to the reference suction dryness can be accurately determined, thereby further improving the accuracy of the actual suction dryness of the compressor determined subsequently.

[0102] In some other implementation manners, if the operating condition parameters do not include the suction pressure, the flow rate and the power of the compressor can be determined according to the exhaust gas pressure, the conversion coefficient between the exhaust gas pressure and the suction pressure, and the operating frequency, and the heat dissipation amount can be determined according to the exhaust gas temperature, the ambient temperature, and the structural characteristic parameters.

[0103] It should be noted that the above examples are only for understanding the present application and do not constitute a limitation on the method for determining the suction dryness of the compressor of the present application. Based on this technical concept, more forms of simple transformation are within the protection scope of the present application.

[0104] The present application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the method for determining the suction dryness of the compressor in the above embodiment.

[0105] The computer-readable storage medium provided by the present application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or components, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections with 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 fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, device, or component. The program code contained on the computer-readable storage medium can be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0106] The above computer-readable storage medium can be included in the suction dryness determination device; it can also exist separately without being assembled into the suction dryness determination device.

[0107] The above computer-readable storage medium carries one or more programs. When the one or more programs are executed by the suction dryness determination device, the suction dryness determination device is caused to perform the following processes: obtaining the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference suction dryness; determining the actual suction dryness of the compressor based on the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness.

[0108] Computer program code for performing the operations of the present application can be written in one or more programming languages or combinations thereof. The above-mentioned programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include 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, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0109] The readable storage medium provided by the present application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for performing the above-mentioned suction dryness determination method of the compressor, and can solve the technical problem of how to accurately detect the suction dryness of the compressor to improve the control accuracy of the system where the compressor is located. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as those of the suction dryness determination method of the compressor provided in the above-mentioned embodiment, and will not be elaborated here.

[0110] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the boxes may occur in a different order than that marked in the accompanying drawings. For example, two consecutive boxes shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0111] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. The modules described in the embodiments of this application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation on the unit itself in some cases. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0112] The above are only some embodiments of this application, and thus do not limit the patent scope of this application. Any equivalent structural transformation made under the technical concept of this application by using the content of the specification and drawings of this application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method for determining the suction dryness of a compressor, characterized in that, The method includes: Obtaining the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference suction dryness; Determining the actual suction dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness.

2. The method according to claim 1, wherein The reference suction dryness is a critical value for distinguishing whether there is liquid in the refrigerant. The step of determining the actual suction dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness includes: When the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is less than or equal to a preset threshold, determining the reference suction dryness as the actual suction dryness.

3. The method according to claim 2, characterized in that The step of determining the actual suction dryness of the compressor according to the actual exhaust temperature, the theoretical exhaust temperature, and the reference suction dryness further includes: When the temperature deviation value between the theoretical exhaust temperature and the actual exhaust temperature is greater than the preset threshold, adjusting the reference suction dryness according to the theoretical exhaust temperature and the actual exhaust temperature; Returning to execute the step of obtaining the actual exhaust temperature of the compressor and the theoretical exhaust temperature corresponding to the reference suction dryness.

4. The method according to claim 3, wherein The step of adjusting the reference suction dryness according to the theoretical exhaust temperature and the actual exhaust temperature includes: When the actual exhaust temperature is less than the theoretical exhaust temperature, reducing the reference suction dryness; When the actual exhaust temperature is greater than the theoretical exhaust temperature, increasing the reference suction dryness.

5. The method according to any one of claims 1 to 4, characterized in that, The step of obtaining the theoretical exhaust temperature corresponding to the reference suction dryness includes: Obtaining the structural characteristic parameters and operating condition parameters of the compressor; Determining the theoretical exhaust temperature corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters.

6. The method according to claim 5, wherein The step of determining the theoretical exhaust temperature corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters includes: Determining the flow rate of the compressor, the power of the compressor, the heat dissipation between the compressor and the environment, and the suction enthalpy value corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters; Determining the theoretical exhaust enthalpy value of the compressor according to the suction enthalpy value, the flow rate, the power, and the heat dissipation; Determining the theoretical exhaust temperature according to the theoretical exhaust enthalpy value.

7. The method according to claim 6, wherein The operating condition parameters include the suction pressure, the exhaust pressure, the working frequency, the exhaust temperature, and the ambient temperature. The step of determining the flow rate of the compressor, the power of the compressor, the heat dissipation between the compressor and the environment, and the suction enthalpy value corresponding to the reference suction dryness according to the structural characteristic parameters and the operating condition parameters includes: Determining the suction density and the suction enthalpy value of the compressor according to the suction pressure; Determining the flow rate and the power according to the suction pressure, the exhaust pressure, the working frequency, and the suction density, and determining the heat dissipation according to the exhaust temperature, the ambient temperature, and the structural characteristic parameters.

8. The method according to claim 7, wherein The structural characteristic parameters include the outer surface area of the housing, the convective heat transfer coefficient of the housing, and the emissivity of the housing; and / or, the step of determining the flow rate and the power according to the suction pressure, the discharge pressure, the operating frequency, and the suction density includes: Determining the isentropic compression power of the compressor according to the reference suction dryness, the suction pressure, and the discharge pressure, and determining the volumetric efficiency of the compressor and the isentropic efficiency of the compressor according to the suction pressure, the discharge pressure, and the operating frequency; Determining the flow rate of the compressor according to the suction density, the operating frequency, and the volumetric efficiency, and determining the power according to the isentropic efficiency and the isentropic compression power.

9. An apparatus for determining suction dryness, characterized in that, The suction dryness determination device includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the method for determining the suction dryness of the compressor according to any one of claims 1 to 8.

10. An air conditioner, characterized in that, The air conditioner includes a compressor and the suction dryness determination device according to claim 9, an exhaust detection module is arranged on the discharge side of the compressor, and the exhaust detection module is communicatively connected to the suction dryness determination device.

11. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the method for determining the suction dryness of the compressor according to any one of claims 1 to 8 are implemented.

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