Method for measuring the dryness of compressor return air, apparatus, device and storage medium

ES3077375T3Undetermined Publication Date: 2026-08-31GD MIDEA HEATING & VENTILATING EQUIPMENT CO LTD (50 00) +1
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Patent Information

Application Number
ES2021899647T
Authority / Receiving Office
ES · ES
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-12-04
Filing Date
2021-08-31
Publication Date
2026-08-31
Estimated Expiration
2041-08-31

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Abstract

Method for measuring the dryness of the return air from the compressor, apparatus, device, and storage support, belonging to the field of air conditioning technology. The method comprises: obtaining the exhaust air pressure, return air pressure, operating frequency, exhaust air temperature, and compressor return air temperature; determining the saturation temperature of the return air corresponding to the return air pressure; calculating the temperature difference between the return air temperature and the saturation temperature of the return air; and, when the temperature difference is less than a predetermined threshold, calculating the dryness of the compressor return air based on the exhaust air pressure, return air pressure, operating frequency, and exhaust air temperature.
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Description

Method for measuring the dryness of compressor return air, apparatus, device and storage medium Field This disclosure relates to the technical field of air conditioning, and more particularly to a method for detecting compressor return gas dryness, a compressor return gas dryness detection apparatus, a compressor return gas dryness detection device, a computer program and a storage medium. Background The global warming potential (GWP) of R32 refrigerant is 675, 68% lower than the GWP of R410a (2088). R32 is a significant improvement, being much more environmentally friendly, and is widely used in air conditioners. However, R32 has a high adiabatic index, resulting in an exhaust air temperature 10 to 20°C higher than that of R410a. Among the various technologies for lowering exhaust air temperature, liquid-carrying return gas technology can address the high exhaust gas temperature problem without increasing hardware costs. However, the dryness of the return gas cannot be precisely measured. If the dryness is too low, the compressor's refrigerant oil will be diluted, causing abnormal compressor wear and reducing its reliability.The preceding content is used solely to aid in understanding the technical solution of this disclosure and does not imply that the preceding content is considered prior art. WO 2020 / 208736 A1 describes a refrigeration cycle comprising a discharge pressure sensor, a suction pressure sensor, a discharge temperature sensor, and a suction temperature sensor. A control device performs a suction calculation based on the discharge temperature. A discharge superheat is calculated based on the difference between the discharge temperature and the discharge saturation temperature.A bypass valve is closed when the degree of superheat is determined to be equal to or less than a reference discharge degree of superheat, or when the suction degree of superheat calculated based on the difference between the suction temperature and the suction saturation temperature is determined to be equal to or less than the reference suction degree of superheat. US patent 2016 / 01848 A1 describes a refrigeration apparatus comprising a compressor and a controller. The compressor has a housing and a compression element. Compressed refrigerant is discharged from the housing into an internal cavity. An oil sump within the housing collects refrigerant oil. A heater warms the collected refrigerant oil. The controller operates the heater while the refrigeration apparatus is shut down, allowing the refrigerant oil in the oil sump to reach a predetermined temperature. Summary Technical problem The main purpose of this disclosure is to provide a compressor return gas dryness detection method, a compressor return gas dryness detection apparatus, a compressor return gas dryness detection device, a computer program, and a storage medium, with the aim of solving a technical problem in the related technique where it is difficult to accurately measure the dryness of a compressor return gas. Technical solution In order to achieve the foregoing purpose, this disclosure provides a method as defined in claim 1. The method includes: obtaining a compressor exhaust gas pressure, a compressor return gas pressure, a compressor operating frequency, a compressor exhaust gas temperature, and a compressor return gas temperature; determining a return gas saturation temperature corresponding to the return gas pressure; calculating a temperature difference value based on the return gas temperature and the return gas saturation temperature; and calculating, in response to the temperature difference value being less than a predetermined threshold value, a compressor return gas dryness based on the exhaust gas pressure, the return gas pressure, the operating frequency, and the exhaust gas temperature. In one embodiment, the compressor return gas dryness detection method further includes, after said calculation, calculating the temperature difference value based on the return gas temperature and return gas saturation temperature: determining a predetermined return gas dryness as the compressor return gas dryness in response to the temperature difference value being greater than or equal to the predetermined threshold value. According to the invention, said calculation of the compressor return gas dryness based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature includes: determining an exhaust gas enthalpy value based on the exhaust gas pressure and exhaust gas temperature; calculating a compression ratio based on the exhaust gas pressure and return gas pressure, and determining a theoretical enthalpy difference based on the compression ratio; determining an absolute thermal efficiency of the compressor based on the exhaust gas pressure, return gas pressure, and operating frequency; and calculating the compressor return gas dryness based on the exhaust gas enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure. In one embodiment, said calculation of the compressor return gas dryness based on the exhaust gas enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure includes: calculating a return gas enthalpy value based on the exhaust gas enthalpy value, the theoretical enthalpy difference, and the absolute thermal efficiency of the compressor; finding a saturated liquid enthalpy value and a saturated gas enthalpy value that correspond to the return gas pressure; and calculating the compressor return gas dryness based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value. In one embodiment, said calculation of the compressor return gas dryness based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value includes: calculating, based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value, the compressor return gas dryness according to a predetermined return gas dryness formula: where x represents the dryness of the compressor return gas, HT7 represents the enthalpy value of the return gas, Hpe_liq represents the enthalpy value of the saturated liquid and Hpe_gas represents the enthalpy value of the saturated gas. According to the invention, the compressor return gas dryness detection method further includes, after said calculation, in response to the temperature difference value being lower than the predetermined threshold value, the compressor return gas dryness based on the exhaust gas pressure, return gas pressure, operating frequency and exhaust gas temperature: generating an adjustment strategy based on the return gas dryness; and adjusting a compressor operating state based on the adjustment strategy, to control the compressor return gas dryness within a predetermined return gas dryness range. In one embodiment, obtaining the exhaust gas pressure, return gas pressure, operating frequency, exhaust gas temperature, and compressor return gas temperature includes: detecting the compressor exhaust gas pressure using an exhaust gas pressure sensor, and detecting the compressor return gas pressure using a return gas pressure sensor; detecting the compressor exhaust gas temperature using an exhaust gas temperature sensor, and detecting the compressor return gas temperature using a return gas temperature sensor; and obtaining a compressor rotational speed, and determining the compressor operating frequency based on the compressor rotational speed. Furthermore, in order to achieve the above purpose, this disclosure also provides a compressor return gas dryness detection apparatus.The compressor return gas dryness detection device includes: a data acquisition module that obtains exhaust gas pressure, return gas pressure, operating frequency, exhaust gas temperature, and return gas temperature from a compressor; a data search module that determines a return gas saturation temperature corresponding to the return gas pressure; a temperature difference value module that calculates a temperature difference value based on the return gas temperature and the return gas saturation temperature; and a return gas dryness module that calculates, in response to the temperature difference value being lower than a predetermined threshold value, the compressor return gas dryness based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature. Furthermore, to achieve the above objectives, this disclosure further discloses a compressor return gas dryness detection device. The compressor return gas dryness detection device includes a memory; a processor; and a compressor return gas dryness detection program stored in the memory and executable on the processor. The compressor return gas dryness detection program, when executed by the processor, implements a step of a compressor return gas dryness detection method as described above. Furthermore, to achieve the aforementioned purpose, this disclosure also provides a storage medium. The storage medium contains a compressor return gas dryness detection program. When executed by a processor, this program causes the compressor return gas dryness detection device to perform the compressor return gas dryness detection method as described above. Beneficial effect According to the compressor return gas dryness detection method provided in this disclosure, the exhaust gas pressure, return gas pressure, operating frequency, exhaust gas temperature, and compressor return gas temperature are obtained; the return gas saturation temperature corresponding to the return gas pressure is determined; the temperature difference value is calculated based on the return gas temperature and the return gas saturation temperature; and the compressor return gas dryness is calculated based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature, in response to the temperature difference value being lower than the predetermined threshold value.In this disclosure, the return gas saturation temperature corresponding to the return gas pressure is determined based on the return gas pressure. The temperature difference value is calculated based on the return gas temperature and the return gas saturation temperature. The compressor return gas dryness is calculated based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature when the temperature difference value is below a predetermined threshold. This allows for the accurate calculation of the compressor return gas dryness and improves the accuracy of compressor return gas dryness detection. Brief description of the drawings FIG. 1 is a schematic structural diagram illustrating a compressor return gas dryness detection device in a hardware operating environment according to an embodiment of the present disclosure; FIG. 2 is a flow diagram illustrating a first embodiment of a compressor return gas dryness detection method in accordance with this disclosure; FIG.3 is a pressure enthalpy diagram of a refrigeration compression cycle, where the aspirated gas carries liquid, from a compressor return gas dryness detection method according to an embodiment of the present disclosure; FIG.4 is a flow diagram illustrating a second embodiment of a compressor return gas dryness detection method in accordance with this disclosure; FIG. 5 is a flow diagram illustrating a third embodiment of a compressor return gas dryness detection method in accordance with this disclosure; FIG. 6 is a schematic diagram illustrating an actual refrigeration compression cycle and a theoretical refrigeration compression cycle of a compressor return gas dryness detection method according to an embodiment of the present disclosure; and FIG.7 is a functional module diagram of a first embodiment of a compressor return gas dryness detection apparatus according to this disclosure. The achievement of the objective, the functional characteristics and the advantages of this disclosure will be explained in more detail in relation to the realizations, taking as a reference the attached drawings. Detailed description It is understood that the specific achievements described in this document are merely illustrative and are not intended to limit this disclosure. Reference is made to FIG. 1. FIG. 1 is a schematic structural diagram of a compressor return gas dryness detection device in a hardware operating environment according to an embodiment of the present disclosure. As shown in FIG. 1, the compressor return gas dryness detection device may include a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and memory 1005. The communication bus 1002 is configured to establish the connection and communication between these components. The user interface 1003 may include a display and an input unit such as a key. The selectable user interface 1003 may also include a standard wired interface and a wireless interface. Optionally, the network interface 1004 may include a standard wired interface and a wireless interface (e.g., a Wi-Fi interface). The memory 1005 may be high-speed random-access memory (RAM) or non-volatile memory, such as disk memory.Optionally, memory 1005 can be a storage device independent of the processor 1001 described above. Those skilled in the art will appreciate that the device configuration shown in FIG. 1 does not constitute a limitation on the compressor return gas dryness detection device. The compressor return gas dryness detection device may include more or fewer of the components illustrated, or a combination of certain components, or different component arrangements. As shown in FIG. 1, the 1005 memory, as a storage medium, can include an operating system, a network communication module, a user interface module, and a compressor return gas dryness detection program. In the compressor return gas dryness detection device shown in FIG. 1, the network interface 1004 is primarily configured to connect to an external network and perform data communication with other network devices. The user interface 1003 is primarily configured to connect to a user device and perform data communication with the user device. According to this disclosure, the device invokes the compressor return gas dryness detection program stored in memory 1005 via the processor 1001 and executes the compressor return gas dryness detection method provided herein. Based on the above hardware structure, an implementation of the compressor return gas dryness detection method of the present disclosure is provided. Reference is made to FIG. 2. FIG. 2 is a flow diagram illustrating a first embodiment of a compressor return gas dryness detection method in accordance with this disclosure. In the first embodiment, the method for detecting dryness of the compressor return gas includes the following steps. In stage S10, an exhaust gas pressure, a return gas pressure, a working frequency, an exhaust gas temperature and a return gas temperature are obtained from a compressor. It should be noted that an implementing entity of this embodiment may be a compressor return gas dryness detection device, such as a computer device, or other devices capable of performing the same or similar functions. This embodiment is not limited to this, and the computer device will be described as an example herein. It is understood that, as shown in Figure 3, Figure 3 is a pressure-enthalpy diagram of a refrigeration compression cycle where the intake gas carries liquid, and where 3-4 represents a return gas saturation compression process. However, due to the physical properties of refrigerant R32, the exhaust gas temperature at point 4 will be 10 to 20 °C higher than that of the R410a cycle, and may exceed a compressor's reliable operating range under certain conditions. This results in carbonization and cracking of the compressor's refrigerant oil, thus reducing its lubricating effect and causing abnormal wear or even damage to the compressor. One commonly used solution is to control the liquid-carrying return gas from a process 1-2, as shown in the figure, which can effectively reduce the exhaust gas temperature.However, it is very difficult to measure the amount of liquid carried by the return gas, that is, the dryness (x) of the return gas. If the dryness is too low, compressor fluid will be compressed and the compressor will be damaged. The compressor can be understood as a gas air conditioning system compressor. When the compressor is operating, the exhaust gas pressure, return gas pressure, operating frequency, exhaust gas temperature, and compressor return gas temperature can be obtained, and the dryness of the compressor return gas can be detected through these compressor parameters. Furthermore, in order to obtain the compressor parameters more accurately, stage S10 includes: detecting the compressor exhaust gas pressure using an exhaust gas pressure sensor, and detecting the compressor return gas pressure using a return gas pressure sensor; detecting the compressor exhaust gas temperature using an exhaust gas temperature sensor, and detecting the compressor return gas temperature using a return gas temperature sensor; and obtaining a compressor rotation speed, and determining the compressor's operating frequency based on the compressor rotation speed. It is understood that the exhaust gas pressure sensor, the return gas pressure sensor, the exhaust gas temperature sensor, and the return gas temperature sensor can be adjusted in advance, and the exhaust gas pressure sensor can detect an exhaust gas pressure Pc, a return gas pressure PE can be detected by the return gas pressure sensor, an exhaust gas temperature T7c can be detected by the exhaust gas temperature sensor, and a return gas temperature T7 can be detected by the return gas temperature sensor. It is understood that the compressor's rotational speed can also be detected and, therefore, the compressor's rotational speed is obtained; and then a working frequency INV of the compressor can be determined based on the compressor's rotational speed. In stage S20, a return gas saturation temperature corresponding to the return gas pressure is determined. It is understood that the return gas saturation temperatures corresponding to various return gas pressures are pre-established, and after a return gas pressure is currently detected, a return gas saturation temperature corresponding to that return gas pressure can be determined. In this specific implementation, a plurality of selectable return gas pressures and return gas saturation temperatures can first be obtained. In this case, the selectable return gas saturation temperatures correspond one-to-one with the plurality of selectable return gas pressures. An assignment list is established based on the selected return gas pressures and return gas saturation temperatures, and the assignment list records a corresponding relationship between the selected return gas pressures and the selected return gas saturation temperatures. It can be understood that after detecting the return gas pressure Pe, the return gas pressure can be matched with a return gas pressure to be selected from the allocation list, and a return gas saturation temperature Te corresponding to the return gas pressure PE can be determined based on the matching result. In stage S30, a temperature difference value is calculated based on the return gas temperature and the return gas saturation temperature. It is understood that after obtaining the return gas temperature and the return gas saturation temperature, a magnitude ratio between the return gas temperature and the return gas saturation temperature can be obtained by comparison. In this embodiment, the magnitude ratio is determined by calculating the temperature difference value. It can be understood that the temperature difference value can be calculated based on the return gas temperature T7 and the return gas saturation temperature Te, where the temperature difference value is expressed as T7-Te. In stage S40, compressor return gas dryness is calculated based on exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature in response to the temperature difference value being less than a predetermined threshold value. It should be noted that the default threshold value in this embodiment may be 1, and when the temperature difference value T7-TE is less than 1, it can be determined that the return gas carries a liquid, a return gas dryness calculation stage can be introduced under the condition that the return gas carries a liquid, and the compressor return gas dryness can be calculated based on the exhaust gas pressure, the return gas pressure, the working frequency, and the exhaust gas temperature. In addition to the case where the return gas carries a liquid, there is another case where the return gas does not carry any liquid, and the method includes, after step S30: determining a predetermined return gas dryness as the compressor return gas dryness, in response to the temperature difference value being greater than or equal to the predetermined threshold value. It is understood that when the temperature difference value T7-TE is greater than or equal to 1, it can be determined that the return gas is purely gaseous without liquid, and the default return gas dryness can be determined as the compressor return gas dryness, where the default return gas dryness can be set as 1. Therefore, when the return gas is purely gaseous without liquid, the return gas dryness x is 1. Furthermore, the return gas dryness cannot be accurately measured using the relevant technique, and if the return gas dryness is too low, the compressor's refrigerant oil will be diluted, causing abnormal compressor wear. Therefore, the method also includes, after step S40: generating a tuning strategy based on the return gas dryness; and adjusting a compressor operating state based on the tuning strategy to control the compressor's return gas dryness within a predetermined range. It is understood that, after calculating the return gas dryness through the preceding steps, the tuning strategy can be generated based on the current return gas dryness, and the compressor's operating state can be adjusted based on this strategy. In this way, the compressor's return gas dryness can be controlled within a reasonable range, and the compressor's reliability can be improved. In this case, the predetermined return gas dryness range is the reasonable range for return gas dryness, and a specific value for it can be predetermined by the technical personnel, who will not be limited in this implementation. According to this embodiment, the exhaust gas pressure, return gas pressure, operating frequency, exhaust gas temperature, and compressor return gas temperature are obtained; the return gas saturation temperature corresponding to the return gas pressure is determined; the temperature difference value is calculated based on the return gas temperature and the return gas saturation temperature; and the compressor return gas dryness is calculated based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature, in response to the temperature difference value being lower than the predetermined threshold value.In this embodiment, the return gas saturation temperature corresponding to the return gas pressure is determined based on the return gas pressure. The temperature difference value is calculated based on the return gas temperature and the return gas saturation temperature. The compressor return gas dryness is calculated based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature when the temperature difference value is below a predetermined threshold. This allows for the accurate calculation of the compressor return gas dryness and improves the accuracy of compressor return gas dryness detection. In one embodiment, as shown in FIG. 4, a second embodiment of the compressor return gas dryness detection method is proposed in accordance with this disclosure, based on the first embodiment. Step S40 includes the following steps. In stage S401, in response to the temperature difference value being less than a predetermined threshold value, an exhaust gas enthalpy value is determined based on the exhaust air pressure and exhaust gas temperature. It is understood that when the temperature difference value T7-TE is less than 1, it can be determined that the return gas carries a liquid, and the return gas dryness calculation step can be introduced in the case where the return gas carries a liquid. First, the exhaust gas enthalpy value Ht7c can be obtained by a calculation based on the exhaust gas pressure PC and the exhaust gas temperature T7C. The exhaust gas enthalpy value can be calculated according to the following formula: where Ht7c represents the exhaust gas enthalpy value, Pc represents the exhaust gas pressure and T7c represents the exhaust gas temperature. In stage S402, a compression ratio is calculated based on the exhaust gas pressure and the return gas pressure, and a theoretical enthalpy difference is determined based on the compression ratio. It is understood that the compression ratio Pr can be calculated based on the exhaust gas pressure Pc and the return gas pressure Pe. The compression ratio can be calculated using the following formula: where Pr represents the compression ratio, Pc represents the exhaust gas pressure, and Pe represents the return gas pressure. It can be understood that, after obtaining the compression ratio, the theoretical enthalpy difference h can be further determined based on the compression ratio. The theoretical enthalpy difference can be calculated using the following formula: where h represents the theoretical enthalpy difference, and Pr represents the compression ratio. In stage S403, an absolute thermal efficiency of the compressor is determined based on the exhaust gas pressure, return gas pressure, and operating frequency. It is understood that the absolute thermal efficiency i of the compressor can be obtained by an adjustment based on the exhaust gas pressure Pc, the return gas pressure Pe, and the operating frequency INV. The absolute thermal efficiency of the compressor can be calculated using the following formula: where i represents the absolute thermal efficiency of the compressor, Pe represents the return gas pressure, Pc represents the exhaust gas pressure and INV represents the operating frequency. In stage S404, the dryness of the compressor return gas is calculated based on the exhaust gas enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure. It is understood that, after the exhaust gas enthalpy value, the theoretical enthalpy value, and the absolute thermal efficiency of the compressor are obtained by calculation according to the above steps, the compressor return gas dryness can be calculated based on the exhaust gas enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure. In this embodiment, the exhaust gas enthalpy value is determined based on the exhaust gas pressure and exhaust gas temperature; the compression ratio is calculated based on the exhaust gas pressure and the return gas pressure; the theoretical enthalpy difference is determined based on the compression ratio; the absolute thermal efficiency of the compressor is determined based on the exhaust gas pressure, the return gas pressure, and the operating frequency; and the compressor return gas dryness is calculated based on the exhaust gas enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure. In this way, the compressor return gas dryness can be accurately determined. In one embodiment, as shown in FIG. 5, a third embodiment of the compressor return gas dryness detection method is provided according to this disclosure, based on either the first or second embodiment. In this embodiment, the description is based on the first embodiment, and step S404 includes the following steps. In stage S4041, a return gas enthalpy value is calculated based on the exhaust gas enthalpy value, the theoretical enthalpy difference, and the absolute thermal efficiency of the compressor. It is understood that the theoretical enthalpy difference, under adiabatic compression, is the sum of the exhaust gas enthalpy and the return gas enthalpy, as shown in Figure 6. Figure 6 is a schematic diagram illustrating an actual refrigeration compression cycle and a theoretical refrigeration compression cycle. Therefore, the return gas enthalpy value HT7 can be calculated based on the exhaust gas enthalpy value Ht7c, the theoretical enthalpy difference h, and the absolute thermal efficiency i of the compressor. The return gas enthalpy value can be calculated using the following formula: where Ht7 represents the return gas enthalpy value, Ht7c represents the exhaust gas enthalpy value, h represents the theoretical enthalpy difference, and yi represents the absolute thermal efficiency of the compressor. In stage S4042, a saturated liquid enthalpy value and a saturated gas enthalpy value corresponding to the return gas pressure are sought. It is understood that after the return gas enthalpy value is obtained by calculation, the compressor return gas dryness can be further calculated based on the return gas pressure and the return gas enthalpy value. It can be understood that the saturated liquid enthalpy value and the saturated gas enthalpy value corresponding to the return gas pressure can be sought, and the compressor return gas dryness is calculated based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value. It is understood that the saturated liquid enthalpy (Hpe_liq) can be determined at the return gas pressure, and the saturated gas enthalpy can be determined at the return gas pressure. The corresponding relationship between the saturated liquid enthalpy and the return gas pressure, and the corresponding relationship between the saturated gas enthalpy and the return gas pressure, can be established beforehand. Therefore, after determining the return gas pressure, the corresponding saturated liquid enthalpy and saturated gas enthalpy values ​​at the return gas pressure can be determined using the return gas pressure. In stage S4043, the compressor return gas dryness is calculated based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value. It can be understood that after determining the saturated liquid enthalpy value and the saturated gas enthalpy value, the compressor return gas dryness can be calculated based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value. Furthermore, this calculation of the compressor return gas dryness based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value includes: calculating, based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value, the compressor return gas dryness according to a predetermined return gas dryness formula: where x represents the dryness of the compressor return gas, HT7 represents the enthalpy value of the return gas, Hpe_liq represents the enthalpy value of saturated liquid and Hpe_gas represents the enthalpy value of saturated gas. In this embodiment, the return gas enthalpy value is calculated based on the exhaust gas enthalpy value, the theoretical enthalpy difference, and the absolute thermal efficiency of the compressor. The saturated liquid enthalpy value and the corresponding saturated gas enthalpy value for the return gas pressure are then determined. Finally, the compressor return gas dryness is calculated based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value. In this way, the return gas enthalpy value is first calculated accurately, and then the return gas dryness is calculated based on the return gas enthalpy value, thus further improving the accuracy of the return gas dryness. Furthermore, one embodiment of the present disclosure also provides a storage medium.The storage medium contains a compressor return gas dryness detection program. When executed by the processor, this program implements steps of the compressor return gas dryness detection method as described above. Since the storage medium adopts all the technical solutions of the embodiments mentioned above, it has at least all the beneficial effects brought by the technical solutions of the embodiments mentioned above, which will not be repeated here. Furthermore, with reference to FIG. 7, the implementation of this disclosure also provides a compressor return gas dryness detection device. The compressor return gas dryness detection device includes: a data acquisition module 10, a data search module 20, a temperature difference value module 30, and a return gas dryness module 40. Data acquisition module 10 is configured to obtain an exhaust gas pressure, a return gas pressure, a working frequency, an exhaust gas temperature, and a return gas temperature from a compressor. The data search module 20 is configured to determine a return gas saturation temperature corresponding to the return gas pressure. The temperature difference value module 30 is configured to calculate a temperature difference value based on the return gas temperature and the return gas saturation temperature. The return gas dryness module 40 is configured to calculate, in response to the temperature difference value falling below a predetermined threshold value, a compressor return gas dryness based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature. According to this embodiment, the exhaust gas pressure, return gas pressure, operating frequency, exhaust gas temperature, and compressor return gas temperature are obtained; the return gas saturation temperature corresponding to the return gas pressure is determined; the temperature difference value is calculated based on the return gas temperature and the return gas saturation temperature; and the compressor return gas dryness is calculated based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature, in response to the temperature difference value being lower than the predetermined threshold value.In this embodiment, the return gas saturation temperature corresponding to the return gas pressure is determined based on the return gas pressure. The temperature difference value is calculated based on the return gas temperature and the return gas saturation temperature. The compressor return gas dryness is calculated based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature when the temperature difference value is below a predetermined threshold. This allows for the accurate calculation of the compressor return gas dryness and improves the accuracy of compressor return gas dryness detection. In one embodiment, the return gas dryness module 40 is further configured to determine a predetermined return gas dryness as the compressor return gas dryness in response to the temperature difference value being greater than or equal to the predetermined threshold value. In one embodiment, the return gas dryness module 40 is further configured to determine an exhaust gas enthalpy value based on the exhaust gas pressure and exhaust gas temperature; calculate a compression ratio based on the exhaust gas pressure and the return gas pressure, and determine a theoretical enthalpy difference based on the compression ratio; determine an absolute thermal efficiency of the compressor based on the exhaust gas pressure, the return gas pressure, and the operating frequency; and calculate the compressor return gas dryness based on the exhaust gas enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure. In one embodiment, the return gas dryness module 40 is further configured to calculate a return gas enthalpy value based on the exhaust gas enthalpy value, the theoretical enthalpy difference, and the absolute thermal efficiency of the compressor, and to calculate the compressor return gas dryness based on the return gas pressure and the return gas enthalpy value. In one embodiment, the return gas dryness module 40 is further configured to look up a saturated liquid enthalpy value and a saturated gas enthalpy value corresponding to the return gas pressure, and calculate the compressor return gas dryness based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value. In one embodiment, the return gas dryness module 40 is further configured to calculate, based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value, the compressor return gas dryness according to a predetermined return gas dryness formula: where x represents the dryness of the compressor return gas, HT7 represents the enthalpy value of the return gas, Hpe_liq represents the enthalpy value of saturated liquid and Hpe_gas represents the enthalpy value of saturated gas. In one embodiment, the data acquisition module 10 is further configured to: detect the compressor exhaust gas pressure using an exhaust gas pressure sensor, and detect the compressor return gas pressure using a return gas pressure sensor; detect the compressor exhaust gas temperature using an exhaust gas temperature sensor, and detect the compressor return gas temperature using a return gas temperature sensor; and obtain a compressor rotational speed, and determine the compressor operating frequency based on the compressor rotational speed. According to the invention, the compressor return gas dryness detection apparatus further includes a compressor tuning module configured to: generate a tuning strategy based on the return gas dryness; and adjust a compressor operating state based on the tuning strategy, to control the compressor return gas dryness within a predetermined return gas dryness range. For other embodiments or specific implementations of the compressor return gas dryness detection apparatus of this disclosure, reference may be made to the method embodiments mentioned above, which will not be repeated here. It should be noted that, in this document, the terms "comprises," "includes," or any other variant thereof are intended to encompass a non-exclusive inclusion, such that the process, method, article, or device comprising a set of elements not only includes those elements but also includes other elements not explicitly listed or even elements inherent to the process, method, article, or device. Unless otherwise restricted, an element defined by the expression "comprises / includes" does not preclude the presence of additional identical elements in the process, method, article, or device comprising that element. The serial numbers above for the embodiments in this disclosure are for descriptive purposes only and do not represent the advantages or disadvantages of such embodiments. Based on the preceding description of the embodiments, those skilled in the art will understand that the method described above can be implemented using software, along with the necessary common hardware platform, and, of course, alternatively using hardware, although in many cases the former is the preferred implementation. On this basis, the technical solution described herein, either in its essence or in the part thereof that contributes to the prior art, can be implemented as software products.The computer software product is stored on a computer-readable storage medium (e.g., ROM / RAM, magnetic disk, optical disk) as described above, including instructions to make a smart device (which may be a mobile phone, a computer, a compressor return gas dryness detection device, a gas conditioner, or a network compressor return gas dryness detection device, etc.) perform the methods described in various embodiments of this disclosure.

Claims

1. A computer-implemented method for detecting compressor return gas dryness, comprising: (S10) obtaining a compressor exhaust gas pressure, a compressor return gas pressure, a compressor operating frequency, a compressor exhaust gas temperature, and a compressor return gas temperature; (S20) determining a return gas saturation temperature corresponding to the return gas pressure; (S30) calculating a temperature difference value based on the return gas temperature and the return gas saturation temperature; (S40) calculating, in response to the temperature difference value being less than a predetermined threshold value, a compressor return gas dryness based on the exhaust gas pressure, the return gas pressure,the operating frequency and exhaust gas temperature; generate a tuning strategy based on the return gas dryness; and adjust a compressor operating state based on the tuning strategy, to control the compressor's return gas dryness within a predetermined return gas dryness range, wherein calculating (S40) the compressor's return gas dryness based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature comprises: determining an exhaust gas enthalpy value based on the exhaust gas pressure and exhaust gas temperature; (S402) calculating a compression ratio based on the exhaust gas pressure and return gas pressure, and determining a theoretical enthalpy difference based on the compression ratio; (S403) determining an absolute thermal efficiency of the compressor based on the exhaust gas pressure,the return gas pressure and operating frequency; and (S404) calculating the compressor return gas dryness based on the exhaust gas enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure.

2. The computer-implemented method according to claim 1, further comprising, after (S30) calculating the temperature difference value based on the return gas temperature and the return gas saturation temperature: determining a predetermined return gas dryness as the compressor return gas dryness in response to the temperature difference value being greater than or equal to the predetermined threshold value.

3. The computer-implemented method according to claim 1 or 2, wherein (S404) calculating the compressor return gas dryness based on the exhaust gas enthalpy value, the theoretical enthalpy difference,The absolute thermal efficiency of the compressor and the return gas pressure comprises: (S4041) calculating a return gas enthalpy value based on the exhaust gas enthalpy value, the theoretical enthalpy difference, and the absolute thermal efficiency of the compressor; (S4042) finding a saturated liquid enthalpy value and a saturated gas enthalpy value that correspond to the return gas pressure; and (S4043) calculating the compressor return gas dryness based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value.

4. The computer-implemented method according to claim 3, wherein (S4043) calculating the compressor return gas dryness based on the saturated liquid enthalpy value, the saturated gas enthalpy value, and the return gas enthalpy value comprises: calculating, based on the saturated liquid enthalpy value,the saturated gas enthalpy value and the return gas enthalpy value, the compressor return gas dryness according to a predetermined return gas dryness formula: where x represents the compressor return gas dryness, Ht7 represents the return gas enthalpy value, Hpe_liq represents the saturated liquid enthalpy value, and Hpe_gas represents the saturated gas enthalpy value.

5. The computer-implemented method according to any one of claims 1 to 4, wherein (S10) obtaining the exhaust gas pressure, the return gas pressure, the operating frequency,The exhaust gas temperature and compressor return gas temperature measurement device comprises: detecting the compressor exhaust gas pressure using an exhaust gas pressure sensor and detecting the compressor return gas pressure using a return gas pressure sensor; detecting the compressor exhaust gas temperature using an exhaust gas temperature sensor, and detecting the compressor return gas temperature using a return gas temperature sensor; and obtaining a compressor rotational speed and determining the compressor operating frequency based on the compressor rotational speed.

6. A compressor return gas dryness detection device, comprising: a data acquisition module (10) that obtains an exhaust gas pressure, a return gas pressure, an operating frequency,an exhaust gas temperature and a return gas temperature of a compressor; a data lookup module (20) that determines a return gas saturation temperature corresponding to the return gas pressure; a temperature difference value module (30) that calculates a temperature difference value based on the return gas temperature and the return gas saturation temperature; a return gas dryness module (40) that calculates, in response to the temperature difference value being less than a predetermined threshold value, a return gas dryness of the compressor based on the exhaust gas pressure, the return gas pressure, the operating frequency, and the exhaust gas temperature; and a compressor tuning module configured to: generate a tuning strategy based on the return gas dryness; and adjust a compressor operating state based on the tuning strategy.for controlling the compressor return gas dryness within a predetermined return gas dryness range, wherein calculating, by means of the return gas dryness module (40), the compressor return gas dryness based on the exhaust gas pressure, return gas pressure, operating frequency, and exhaust gas temperature comprises: determining an exhaust gas enthalpy value based on the exhaust gas pressure and exhaust gas temperature; (S402) calculating a compression ratio based on the exhaust gas pressure and return gas pressure, and determining a theoretical enthalpy difference based on the compression ratio; (S403) determining an absolute thermal efficiency of the compressor based on the exhaust gas pressure, return gas pressure, and operating frequency; and (S404) calculating the compressor return gas dryness based on the exhaust gas enthalpy value.the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return gas pressure.

7. A computer program comprising instructions for causing the apparatus of claim 6 to execute the steps of the method of any one of claims 1 to 5.

8. A computer-readable medium having stored therein the computer program of claim 7.