Automatic ash removal method and device, air source heat pump and readable storage medium

Abstract

The invention discloses an automatic dust removal method and device, an air source heat pump and a readable storage medium. The automatic ash removal method comprises the steps that working parameters of the air source heat pump are obtained, wherein the working parameters comprise the environment temperature, the standard heat exchange temperature difference, the inlet temperature, the inlet pressure, the outlet temperature and the outlet pressure of an outdoor heat exchanger and the suction temperature and the suction saturation pressure of a compressor; calculating the dust deposition degree of the outdoor heat exchanger according to the working parameters; the heat exchange temperature difference value of the outdoor heat exchanger is calculated according to the working parameters; calculating the suction superheat degree of the outdoor heat exchanger according to the working parameters; and when the dust accumulation degree is larger than or equal to the first preset value, the heat exchange temperature difference value is larger than or equal to the second preset value, and the suction superheat degree is smaller than or equal to the third preset value, filth blockage of the outdoor heat exchanger is confirmed, and dust removal of the outdoor heat exchanger is started. According to the automatic dust removal method, the accuracy of judging whether filth blockage happens to the outdoor heat exchanger or not can be improved, and the situation of misjudgment can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange equipment, and more specifically, to an automatic ash removal method, device, air source heat pump, and readable storage medium. Background Art

[0002] During the operation of an air source heat pump, the outdoor heat exchanger is affected by dust particles in the environment, and its surface is prone to fouling and blockage, which affects the normal operation of the air source heat pump. Therefore, the outdoor heat exchanger needs to be automatically ash-removed in a timely manner when blockage occurs. Common automatic ash removal methods for outdoor heat exchangers usually judge whether the outdoor heat exchanger is blocked by detecting changes in fan parameters such as current and voltage. However, in addition to blockage of the outdoor heat exchanger, the fan parameters are also affected by multiple factors and change. Judging the blockage of the outdoor heat exchanger only by changes in fan parameters may result in misjudgment. Summary of the Invention

[0003] Embodiments of the present application provide an automatic ash removal method, device, air source heat pump, and readable storage medium to solve at least one of the above technical problems.

[0004] The automatic ash removal method of the embodiment of the present application is used for an air source heat pump. The air source heat pump includes an indoor unit, an outdoor unit, and a connecting pipe. The indoor unit includes an indoor heat exchanger, and the outdoor unit includes a compressor, a four-way reversing valve, an outdoor heat exchanger, and an outdoor fan. The compressor, the four-way reversing valve, the outdoor heat exchanger, and the indoor heat exchanger are connected by the connecting pipe to form a loop. The automatic ash removal method includes:

[0005] Obtaining the operating parameters of the air source heat pump, where the operating parameters include ambient temperature, standard heat exchange temperature difference, inlet temperature, inlet pressure, outlet temperature, outlet pressure of the outdoor heat exchanger, and suction temperature and suction saturation pressure of the compressor;

[0006] Calculating the ash accumulation degree of the outdoor heat exchanger according to the operating parameters;

[0007] Calculating the heat exchange temperature difference difference of the outdoor heat exchanger according to the operating parameters;

[0008] Calculating the suction superheat degree of the outdoor heat exchanger according to the operating parameters;

[0009] When the ash accumulation degree is greater than or equal to a first preset value, the heat exchange temperature difference difference is greater than or equal to a second preset value, and the suction superheat degree is less than or equal to a third preset value, it is confirmed that the outdoor heat exchanger is blocked and ash removal of the outdoor heat exchanger is started.

[0010] The automatic ash removal method provided by this application calculates the ash accumulation degree, heat transfer temperature difference, and suction superheat degree of the outdoor heat exchanger based on the operating parameters of the air source heat pump, and jointly determines whether the outdoor heat exchanger is clogged according to the ash accumulation degree, heat transfer temperature difference, and suction superheat degree. Considering multiple influencing factors during the process is beneficial to improving the accuracy of judging whether the outdoor heat exchanger is clogged and avoiding misjudgment situations.

[0011] In some embodiments, calculating the ash accumulation degree of the outdoor heat exchanger according to the operating parameters includes:

[0012] Calculating the inlet enthalpy value of the outdoor heat exchanger according to the inlet temperature and the inlet pressure;

[0013] Calculating the outlet enthalpy value of the outdoor heat exchanger according to the outlet temperature and the outlet pressure;

[0014] Calculating the refrigerant flow rate according to the suction saturation pressure and the inlet temperature;

[0015] Calculating the real-time capacity of the outdoor heat exchanger according to the inlet enthalpy value, the outlet enthalpy value, and the refrigerant flow rate;

[0016] Calculating the ash accumulation degree according to the real-time capacity and the rated capacity of the outdoor heat exchanger.

[0017] In this way, calculating the ash accumulation degree using the inlet and outlet pressures and temperatures of the outdoor heat exchanger is beneficial to making the calculated ash accumulation degree more accurate.

[0018] In some embodiments, calculating the refrigerant flow rate according to the suction saturation pressure and the inlet temperature includes:

[0019] Calculating the exhaust saturation temperature according to the inlet temperature;

[0020] Calculating the suction saturation temperature according to the suction saturation pressure;

[0021] Using the compressor ten-factor model, calculating the refrigerant flow rate according to the exhaust saturation temperature and the suction saturation temperature.

[0022] In this way, calculating the exhaust saturation temperature through the inlet temperature, the suction saturation temperature through the suction saturation pressure, and calculating the refrigerant flow rate using the compressor ten-factor model is beneficial to improving the calculation accuracy of the refrigerant flow rate.

[0023] In some embodiments, calculating the heat transfer temperature difference of the outdoor heat exchanger according to the operating parameters includes:

[0024] Calculating the condensation temperature according to the inlet pressure;

[0025] Calculate the real-time heat exchange temperature difference based on the condensation temperature and the ambient temperature;

[0026] Calculate the difference value of the heat exchange temperature difference according to the real-time heat exchange temperature difference and the standard heat exchange temperature difference.

[0027] In this way, calculating the difference value of the heat exchange temperature difference by using the inlet pressure and the ambient temperature is beneficial to reducing the operation difficulty while ensuring the accuracy of the result.

[0028] In some embodiments, calculating the suction superheat degree of the outdoor heat exchanger according to the working parameters includes:

[0029] Calculate the suction saturation temperature according to the suction saturation pressure;

[0030] Calculate the suction superheat degree according to the suction temperature and the suction saturation temperature.

[0031] In this way, calculating the suction superheat degree by using the suction pressure and the suction temperature is beneficial to reducing the operation difficulty while ensuring the accuracy of the result.

[0032] In some embodiments, a throttling component is connected between the indoor heat exchanger and the outdoor heat exchanger. Confirming that the outdoor heat exchanger is dirty and blocked and starting to remove ash from the outdoor heat exchanger includes:

[0033] After confirming that the outdoor heat exchanger is dirty and blocked, determine whether the ash removal condition is met;

[0034] When the ash removal condition is met, control the four-way reversing valve to switch, so that the refrigerant flows along the direction of the compressor - the indoor heat exchanger - the throttling component - the outdoor heat exchanger, and start timing the first operation duration of the compressor;

[0035] When the first operation duration is greater than or equal to the first preset time, and the difference between the outdoor temperature and the outlet temperature is greater than or equal to the first preset temperature and lasts for the second preset time, control the four-way reversing valve to switch, so that the refrigerant flows along the direction of the compressor - the outdoor heat exchanger - the throttling component - the indoor heat exchanger, and at the same time control the outdoor fan to turn on, and restart timing the second operation duration of the compressor;

[0036] When the second operation duration is greater than or equal to the third preset time, and the difference in the outlet temperature is greater than or equal to the second preset temperature and lasts for the fourth preset time, the ash removal ends.

[0037] In this way, the outer surface of the outdoor heat exchanger can be frosted and then defrosted, and the water flow during defrosting can wash away the dust on the outdoor heat exchanger, achieving the effect of automatic ash removal.

[0038] In some embodiments, after confirming that the outdoor heat exchanger is dirty and blocked, determining whether the ash removal condition is satisfied includes:

[0039] Obtain the outdoor relative humidity;

[0040] If the ambient temperature is less than the first preset temperature and the relative humidity is greater than the first relative humidity, the ash removal condition is satisfied; or

[0041] If the ambient temperature is less than the second preset temperature and the relative humidity is greater than the second relative humidity, the ash removal condition is satisfied; or

[0042] If the ambient temperature is less than the third preset temperature and the relative humidity is greater than the third relative humidity, the ash removal condition is satisfied; otherwise, the ash removal condition is not satisfied.

[0043] In this way, at different ambient temperatures, an appropriate relative humidity should be selected to meet the frosting requirements of the outdoor heat exchanger, avoiding too little water flow during defrosting and incomplete ash removal.

[0044] The automatic ash removal device according to the second embodiment of the present application is used for an air source heat pump. The air source heat pump includes an indoor unit, an outdoor unit, and a connecting pipe. The indoor unit includes an indoor heat exchanger, and the outdoor unit includes a compressor, a four-way reversing valve, an outdoor heat exchanger, and an outdoor fan. The compressor, the four-way reversing valve, the outdoor heat exchanger, and the indoor heat exchanger are connected by a connecting pipe to form a loop. The automatic ash removal device includes:

[0045] An acquisition module for acquiring the operating parameters of the air source heat pump. The operating parameters include ambient temperature, standard heat exchange temperature difference, inlet temperature, inlet pressure, outlet temperature, outlet pressure of the outdoor heat exchanger, and suction temperature and suction saturation pressure of the compressor;

[0046] A first calculation module for calculating the ash accumulation degree of the outdoor heat exchanger according to the operating parameters;

[0047] A second calculation module for calculating the heat exchange temperature difference difference of the outdoor heat exchanger according to the operating parameters;

[0048] A third calculation module for calculating the suction superheat degree of the outdoor heat exchanger according to the operating parameters;

[0049] A judgment module for confirming that the outdoor heat exchanger is dirty and blocked and starting to remove ash from the outdoor heat exchanger when the ash accumulation degree is greater than or equal to the first preset value, the heat exchange temperature difference difference is greater than or equal to the second preset value, and the suction superheat degree is less than or equal to the third preset value.

[0050] The air source heat pump according to the third embodiment of the present application, the air source heat pump includes an indoor unit, an outdoor unit and a connecting pipe. The indoor unit includes an indoor heat exchanger, and the outdoor unit includes a compressor, a four-way reversing valve, an outdoor heat exchanger and an outdoor fan. The compressor, the four-way reversing valve, the outdoor heat exchanger and the indoor heat exchanger are connected by the connecting pipe to form a loop. The air source heat pump further includes a processor and a memory, and the memory stores a computer program. When the computer program is executed by the processor, the processor realizes the instructions of the automatic ash removal method as described in any one of the above.

[0051] The non-volatile computer-readable storage medium according to the fourth embodiment of the present application, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the automatic ash removal method as described in any one of the above is realized.

[0052] Additional aspects and advantages of the embodiments of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the embodiments of the present application. Brief Description of the Drawings

[0053] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0054] Figure 1 is a schematic flowchart of the automatic ash removal method of the air source heat pump according to the embodiment of the present application;

[0055] Figure 2 is a schematic module diagram of the automatic ash removal device of the air source heat pump according to the embodiment of the present application;

[0056] Figure 3 is a schematic module diagram of the air source heat pump according to the embodiment of the present application;

[0057] Figure 4 is a schematic structural diagram of the air source heat pump according to the embodiment of the present application;

[0058] Figure 5 is a schematic flowchart of the automatic ash removal method of the air source heat pump according to some embodiments of the present application;

[0059] Figure 6 is a schematic flowchart of the automatic ash removal method of the air source heat pump according to some embodiments of the present application;

[0060] Figure 7 is a schematic flowchart of the automatic ash removal method of the air source heat pump according to some embodiments of the present application;

[0061] Figure 8 is a schematic flowchart of the automatic ash removal method of the air source heat pump according to some embodiments of the present application;

[0062] Figure 9 is a schematic flowchart of an automatic ash removal method for an air source heat pump according to some embodiments of the present application;

[0063] Figure 10 is a schematic flowchart of an automatic ash removal method for an air source heat pump according to some embodiments of the present application;

[0064] Figure 11 is a schematic flowchart of an automatic ash removal method for an air source heat pump according to some embodiments of the present application;

[0065] Figure 12 is a schematic flowchart of an automatic ash removal method for an air source heat pump according to some embodiments of the present application.

[0066] Description of main component symbols: air source heat pump 100, automatic ash removal device 10, acquisition module 11, first calculation module 12, second calculation module 13, third calculation module 14, judgment module 15, processor 20, memory 30, outdoor unit 40, compressor 41, oil separator 42, four-way reversing valve 43, outdoor heat exchanger 44, outdoor fan 45, gas-liquid separator 46, throttling assembly 50, first expansion valve 51, check valve 52, second expansion valve 53, indoor unit 60, indoor heat exchanger 61, detection assembly 70, inlet temperature sensor 71, inlet pressure sensor 72, temperature and humidity sensor 73, outlet pressure sensor 74, outlet temperature sensor 75, suction temperature sensor 76, low pressure sensor 77. Detailed embodiments

[0067] The following further describes the embodiments of the present application with reference to the accompanying drawings. The same or similar reference numerals in the drawings denote the same or similar elements or elements with the same or similar functions throughout.

[0068] In addition, the embodiments of the present application described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be construed as a limitation to the present application.

[0069] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0070] During the operation of an air source heat pump, the outdoor heat exchanger is affected by dust particles in the environment, and its surface is extremely prone to fouling and clogging, which affects the normal operation of the air source heat pump. Therefore, the outdoor heat exchanger needs to be automatically ash-removed in a timely manner when clogging occurs. For common automatic ash-removal methods of outdoor heat exchangers, it is usually judged whether the outdoor heat exchanger is clogged by detecting changes in fan parameters such as current and voltage. However, in addition to the clogging of the outdoor heat exchanger, the parameters of the fan will also change due to multiple factors, and misjudgment may occur when judging the clogging of the outdoor heat exchanger only by changes in fan parameters.

[0071] Please refer to Figure 1 , an embodiment of the present application provides an automatic ash-removal method for an air source heat pump 100. The air source heat pump 100 includes an indoor unit 60, an outdoor unit 40 and a connecting pipe. The indoor unit 60 includes an indoor heat exchanger 61. The outdoor unit 40 includes a compressor 41, a four-way reversing valve 43, an outdoor heat exchanger 44 and an outdoor fan 45. The compressor 41, the four-way reversing valve 43, the outdoor heat exchanger 44 and the indoor heat exchanger 61 are connected by a connecting pipe to form a loop. The automatic ash-removal method includes:

[0072] Step 01: Obtain the operating parameters of the air source heat pump. The operating parameters include ambient temperature, standard heat exchange temperature difference, inlet temperature, inlet pressure, outlet temperature, outlet pressure of the outdoor heat exchanger, and suction temperature and suction saturation pressure of the compressor;

[0073] Step 02: Calculate the ash accumulation degree of the outdoor heat exchanger according to the operating parameters;

[0074] Step 03: Calculate the heat exchange temperature difference difference of the outdoor heat exchanger according to the operating parameters;

[0075] Step 04: Calculate the suction superheat degree of the outdoor heat exchanger according to the operating parameters;

[0076] Step 05: When the ash accumulation degree is greater than or equal to the first preset value, the heat exchange temperature difference difference is greater than or equal to the second preset value, and the suction superheat degree is less than or equal to the third preset value, confirm that the outdoor heat exchanger is clogged and start ash-removing the outdoor heat exchanger.

[0077] Please refer to Figure 2, the second embodiment of the present application provides an automatic ash removal device 10 for an air source heat pump 100. The air source heat pump 100 includes an indoor unit 60, an outdoor unit 40, and a connecting pipe. The indoor unit 60 includes an indoor heat exchanger 61. The outdoor unit 40 includes a compressor 41, a four-way reversing valve 43, an outdoor heat exchanger 44, and an outdoor fan 45. The compressor 41, the four-way reversing valve 43, the outdoor heat exchanger 44, and the indoor heat exchanger 61 are connected by a connecting pipe to form a loop. The automatic ash removal device 10 includes an acquisition module 11, a first calculation module 12, a second calculation module 13, a third calculation module 14, and a judgment module 15. The acquisition module 11 is used to acquire the operating parameters of the air source heat pump 100. The operating parameters include ambient temperature, standard heat exchange temperature difference, inlet temperature, inlet pressure, outlet temperature, outlet pressure of the outdoor heat exchanger 44, and the suction temperature and suction saturation pressure of the compressor 41. The first calculation module 12 is used to calculate the ash accumulation degree of the outdoor heat exchanger 44 according to the operating parameters. The second calculation module 13 is used to calculate the heat exchange temperature difference difference of the outdoor heat exchanger 44 according to the operating parameters. The third calculation module 14 is used to calculate the suction superheat degree of the outdoor heat exchanger 44 according to the operating parameters. The judgment module 15 is used to confirm that the outdoor heat exchanger 44 is dirty and blocked and start ash removal for the outdoor heat exchanger 44 when the ash accumulation degree is greater than or equal to a first preset value, the heat exchange temperature difference difference is greater than or equal to a second preset value, and the suction superheat degree is less than or equal to a third preset value.

[0078] Please refer to Figure 3 , the third embodiment of the present application provides an air source heat pump 100. The air source heat pump 100 includes an indoor unit 60, an outdoor unit 40, and a connecting pipe. The indoor unit 60 includes an indoor heat exchanger 61. The outdoor unit 40 includes a compressor 41, a four-way reversing valve 43, an outdoor heat exchanger 44, and an outdoor fan 45. The compressor 41, the four-way reversing valve 43, the outdoor heat exchanger 44, and the indoor heat exchanger 61 are connected by a connecting pipe to form a loop. The air source heat pump 100 further includes a processor 20 and a memory 30. The memory 30 stores a computer program. When the computer program is executed by the processor 20, it enables the processor 20 to implement the instructions of the automatic ash removal method as described in any one of the above. Or rather, the processor 20 can be used to acquire the operating parameters of the air source heat pump 100. The operating parameters include ambient temperature, standard heat exchange temperature difference, inlet temperature, inlet pressure, outlet temperature, outlet pressure, suction saturation pressure of the outdoor heat exchanger 44, and the suction temperature and suction pressure of the compressor 41; calculate the ash accumulation degree of the outdoor heat exchanger 44 according to the operating parameters; calculate the heat exchange temperature difference difference of the outdoor heat exchanger 44 according to the operating parameters; calculate the suction superheat degree of the outdoor heat exchanger 44 according to the operating parameters; confirm that the outdoor heat exchanger 44 is dirty and blocked and start ash removal for the outdoor heat exchanger 44 when the ash accumulation degree is greater than or equal to a first preset value, the heat exchange temperature difference difference is greater than or equal to a second preset value, and the suction superheat degree is less than or equal to a third preset value.

[0079] The automatic ash removal method provided by this application calculates the ash accumulation degree, heat exchange temperature difference, and suction superheat degree of the outdoor heat exchanger 44 based on the operating parameters of the air source heat pump 100, and jointly determines whether the outdoor heat exchanger 44 is clogged according to the ash accumulation degree, heat exchange temperature difference, and suction superheat degree. Considering multiple influencing factors during the process is beneficial to improving the accuracy of judging whether the outdoor heat exchanger 44 is clogged and avoiding misjudgment situations.

[0080] Specifically, in the embodiment of this application, the air source heat pump 100 includes an outdoor unit 40, a throttling assembly 50, an indoor unit 60, and a connecting pipe. Among them, the outdoor unit 40 includes a compressor 41, an oil separator 42, a four-way reversing valve 43, an outdoor heat exchanger 44, an outdoor fan 45, and a gas-liquid separator 46. As Figure 4 shown, the four-way reversing valve 43 includes four connection ports A, B, C, and D. The exhaust port of the compressor 41 is connected to the inlet of the oil separator 42, the outlet of the oil separator 42 is connected to the A connection port of the four-way reversing valve 43, the B connection port of the four-way reversing valve 43 is connected to the inlet of the outdoor heat exchanger 44, the outlet of the outdoor heat exchanger 44 is connected to the indoor heat exchanger 61 through the throttling assembly 50, the outlet of the indoor heat exchanger 61 is connected to the C connection port of the four-way reversing valve 43, the D connection port of the four-way reversing valve 43 is connected to the inlet of the gas-liquid separator 46, and the outlet of the gas-liquid separator 46 is connected to the suction port of the compressor 41.

[0081] Furthermore, the air source heat pump 100 further includes a detection assembly 70. The detection assembly 70 includes an inlet temperature sensor 71, an inlet pressure sensor 72, a temperature and humidity sensor 73, an outlet pressure sensor 74, an outlet temperature sensor 75, a suction temperature sensor 76, and a low-pressure sensor 77. As Figure 4 shown, the inlet temperature sensor 71 and the inlet pressure sensor 72 are placed on the connecting pipe where the B connection port of the four-way reversing valve 43 is connected to the inlet of the outdoor heat exchanger 44, and are used to detect the inlet temperature and inlet pressure of the outdoor heat exchanger 44. The temperature and humidity sensor 73 is set on the outdoor heat exchanger 44 and is used to detect the ambient temperature and outdoor relative humidity. The outlet pressure sensor 74 and the outlet temperature sensor 75 are placed on the connecting pipe where the outlet of the outdoor heat exchanger 44 is connected to the throttling assembly 50, and are used to detect the outlet temperature and outlet pressure of the outdoor heat exchanger 44. The suction temperature sensor 76 and the low-pressure sensor 77 are placed on the connecting pipe where the outlet of the gas-liquid separator 46 is connected to the suction port of the compressor 41, and are used to detect the suction temperature and suction saturation pressure of the compressor 41.

[0082] Please refer to Figure 5 , in some embodiments, step 02 includes:

[0083] 021: Calculate the inlet enthalpy value of the outdoor heat exchanger according to the inlet temperature and inlet pressure;

[0084] 022: Calculate the outlet enthalpy value of the outdoor heat exchanger according to the outlet temperature and outlet pressure;

[0085] 023: Calculate the refrigerant flow rate according to the suction saturation pressure and the inlet temperature;

[0086] 024: Calculate the real-time capacity of the outdoor heat exchanger according to the inlet enthalpy value, the outlet enthalpy value and the refrigerant flow rate;

[0087] 025: Calculate the fouling degree according to the real-time capacity and the rated capacity of the outdoor heat exchanger.

[0088] In this way, calculating the fouling degree by using the inlet and outlet pressures and the inlet and outlet temperatures of the outdoor heat exchanger 44 is beneficial to making the calculated fouling degree more accurate.

[0089] In some embodiments, the sub-steps 021, 022, 023, 024 and 025 can be implemented by the first calculation module 12, or rather, the first calculation module 12 can be used to calculate the inlet enthalpy value of the outdoor heat exchanger 44 according to the inlet temperature and the inlet pressure; calculate the outlet enthalpy value of the outdoor heat exchanger 44 according to the outlet temperature and the outlet pressure; calculate the refrigerant flow rate according to the suction saturation pressure and the inlet temperature; calculate the real-time capacity of the outdoor heat exchanger 44 according to the inlet enthalpy value, the outlet enthalpy value and the refrigerant flow rate; calculate the fouling degree according to the real-time capacity and the rated capacity of the outdoor heat exchanger 44.

[0090] In some embodiments, the processor 20 can be used to calculate the inlet enthalpy value of the outdoor heat exchanger 44 according to the inlet temperature and the inlet pressure; calculate the outlet enthalpy value of the outdoor heat exchanger 44 according to the outlet temperature and the outlet pressure; calculate the refrigerant flow rate according to the suction saturation pressure and the inlet temperature; calculate the real-time capacity of the outdoor heat exchanger 44 according to the inlet enthalpy value, the outlet enthalpy value and the refrigerant flow rate; calculate the fouling degree according to the real-time capacity and the rated capacity of the outdoor heat exchanger 44.

[0091] Specifically, in the embodiment of the present application, first, the inlet temperature T1 and the inlet pressure P1 of the outdoor heat exchanger 44 are detected in real time through the inlet temperature sensor 71 and the inlet pressure sensor 72, and the inlet enthalpy value H1 of the outdoor heat exchanger 44 is calculated according to the inlet temperature T1 and the inlet pressure P1. The outlet pressure P2 and the outlet temperature T2 of the outdoor heat exchanger 44 are detected in real time through the outlet pressure sensor 74 and the outlet temperature sensor 75, and the outlet enthalpy value H2 of the heat exchanger is calculated according to the outlet temperature T2 and the outlet pressure P2. Then, the refrigerant flow rate q is calculated according to the suction saturation pressure of the compressor 41 at the inlet temperature T1 of the outdoor heat exchanger 44.

[0092] Then, the real-time capacity of the outdoor heat exchanger 44 is calculated through the inlet enthalpy value H1, the outlet enthalpy value H2 and the refrigerant flow rate q, and the real-time capacity Q = q(H1 - H2).

[0093] So far, the fouling degree of the outdoor heat exchanger 44 can be calculated according to the real-time capacity Q and the rated capacity Q1 of the outdoor heat exchanger 44. The specific calculation formula for the fouling degree of the outdoor heat exchanger 44 is: η = (Q1 - Q) / Q1, where the rated capacity Q1 of the outdoor heat exchanger 44 can be obtained from the product manual, technical manual or data sheet provided by the manufacturer of the outdoor heat exchanger 44.

[0094] Please refer to Figure 6 , in some embodiments, sub-step 023 includes:

[0095] 0231: Calculate the exhaust saturation temperature according to the inlet temperature;

[0096] 0232: Calculate the suction saturation temperature according to the suction saturation pressure;

[0097] 0233: Use the compressor ten-coefficient model to calculate the refrigerant flow rate according to the exhaust saturation temperature and the suction saturation temperature.

[0098] In this way, calculating the exhaust saturation temperature through the inlet temperature, the suction saturation temperature through the suction saturation pressure, and calculating the refrigerant flow rate using the compressor 41 ten-coefficient model is beneficial to improving the calculation accuracy of the refrigerant flow rate.

[0099] In some embodiments, sub-steps 0231, 0232 and 0233 can be implemented by the first calculation module 12, or rather, the first calculation module 12 can be used to calculate the exhaust saturation temperature according to the inlet temperature; calculate the suction saturation temperature according to the suction saturation pressure; use the compressor 41 ten-coefficient model to calculate the refrigerant flow rate according to the exhaust saturation temperature and the suction saturation temperature.

[0100] In some embodiments, the processor 20 can be used to calculate the exhaust saturation temperature according to the inlet temperature; calculate the suction saturation temperature according to the suction saturation pressure; use the compressor 41 ten-coefficient model to calculate the refrigerant flow rate according to the exhaust saturation temperature and the suction saturation temperature.

[0101] Specifically, the compressor 41 ten-coefficient model, namely the AHRI ten-coefficient model, uses ten parameters (the so-called "compressor 41 ten-coefficients") to calculate performance parameters such as the cooling capacity, energy efficiency ratio, power, and mass flow rate of the compressor 41. The compressor 41 ten-coefficients usually include multiple parameters such as the capacity coefficient, exhaust temperature coefficient, power coefficient, etc., but which specific ten coefficients may vary in different literatures or materials.

[0102] In the embodiments of the present application, the refrigerant flow rate q can be calculated by using the compressor 41 ten - coefficient model and the compressor 41 exhaust saturation temperature and suction saturation temperature. Among them, the exhaust saturation temperature is equal to the inlet temperature T1 of the outdoor heat exchanger 44, the suction saturation temperature T3 can be obtained by calculating the suction saturation pressure P3, and the suction saturation pressure P3 is detected in real - time by the low - pressure sensor 77.

[0103] In some embodiments, the first preset value is 40%.

[0104] In this way, when the dust accumulation degree is less than 40%, the impact on the normal operation of the air - source heat pump 100 is relatively small. Selecting the first preset value of 40% can, while ensuring that the air - source heat pump 100 is not affected, reduce the frequency of ash removal and avoid energy waste caused by excessive frequency.

[0105] Specifically, when the ash removal is carried out at a relatively low dust accumulation degree, the performance degradation of the heat exchanger may not be obvious, so the impact on the overall system is relatively small. Although the cleanliness of the heat exchanger can be maintained, frequent cleaning will increase the maintenance cost. When the dust accumulation degree is greater than or equal to 40%, the performance of the heat exchanger has begun to decline significantly, resulting in an increase in system energy consumption and operating costs. At this time, ash removal can restore most of its performance and avoid the cost increase caused by premature and frequent ash removal.

[0106] Therefore, in the embodiments of the present application, the first preset value is 40%, that is, when the dust accumulation degree of the outdoor heat exchanger 44 reaches 40% or more, ash removal is considered to start. Selecting to carry out ash removal when the dust accumulation degree is greater than or equal to 40% can be a relatively reasonable maintenance cycle point, which not only ensures the cleanliness of the outdoor heat exchanger 44 but also avoids premature or overly frequent ash removal.

[0107] Please refer to Figure 7 , in some embodiments, step 03 includes:

[0108] 031: Calculate the condensation temperature according to the inlet pressure;

[0109] 032: Calculate the real - time heat transfer temperature difference according to the condensation temperature and the ambient temperature;

[0110] 033: Calculate the difference between the heat transfer temperature differences according to the real - time heat transfer temperature difference and the standard heat transfer temperature difference.

[0111] In this way, calculating the difference between the heat transfer temperature differences by using the inlet pressure and the ambient temperature is beneficial to reducing the operation difficulty while ensuring the accuracy of the result.

[0112] In some embodiments, sub-steps 031, 032, and 033 may be implemented by the second computing module 13, or rather, the second computing module 13 may be used to calculate the condensation temperature based on the inlet pressure; calculate the real-time heat transfer temperature difference based on the condensation temperature and the ambient temperature; calculate the difference between the heat transfer temperature differences based on the real-time heat transfer temperature difference and the standard heat transfer temperature difference.

[0113] In some embodiments, the processor 20 may be used to calculate the condensation temperature based on the inlet pressure; calculate the real-time heat transfer temperature difference based on the condensation temperature and the ambient temperature; calculate the difference between the heat transfer temperature differences based on the real-time heat transfer temperature difference and the standard heat transfer temperature difference.

[0114] Specifically, in the embodiments of the present application, the real-time heat transfer temperature difference △T = condensation temperature Te - ambient temperature Th, the condensation temperature is calculated from the inlet pressure P1 of the outdoor heat exchanger 44, and the ambient temperature is detected in real time by the temperature and humidity sensor 73.

[0115] The difference between the heat transfer temperature differences △Tt = real-time heat transfer temperature difference △T - standard heat transfer temperature difference △T1, and the standard heat transfer temperature difference △T1 can be obtained through laboratory tests.

[0116] In some embodiments, the second preset value is 5 degrees Celsius.

[0117] In this way, when the difference between the heat transfer temperature differences is less than 5 degrees Celsius, the impact on the normal operation of the air source heat pump 100 is relatively small. Selecting 5 degrees Celsius as the second preset value can reduce the ash removal frequency while ensuring that the air source heat pump 100 is not affected, and avoid energy waste caused by excessive frequency.

[0118] Specifically, when the difference between the heat transfer temperature differences is greater than or equal to 5 degrees Celsius, it usually means that the heat transfer efficiency of the heat exchanger has decreased significantly. Ash removal when the heat transfer efficiency has decreased significantly can restore the performance of the heat exchanger, avoid energy waste and equipment wear caused by long-term inefficient operation, and at the same time can extend the equipment life and reduce the long-term operation cost.

[0119] If ash removal is carried out when the difference between the heat transfer temperature differences is less than 5 degrees Celsius, it may lead to an unnecessary increase in maintenance costs, and premature maintenance may not bring significant performance improvement.

[0120] Therefore, in the embodiments of the present application, the second preset value is 5 degrees Celsius, that is, ash removal of the outdoor heat exchanger 44 is considered when the difference between the heat transfer temperature differences is greater than or equal to 5 degrees Celsius.

[0121] Please refer to Figure 8 , in some embodiments, step 04 includes:

[0122] 041: Calculate the suction saturation temperature based on the suction saturation pressure;

[0123] 042: Calculate the suction superheat based on the suction temperature and the suction saturation temperature.

[0124] In this way, calculating the suction superheat using the suction pressure and the suction temperature is beneficial to reducing the operation difficulty while ensuring the accuracy of the result.

[0125] In some embodiments, sub-steps 041 and 042 can be implemented by the third calculation module 14, or rather, the third calculation module 14 can be used to calculate the suction saturation temperature according to the suction saturation pressure; calculate the suction superheat according to the suction temperature and the suction saturation temperature.

[0126] In some embodiments, the processor 20 can be used to calculate the suction saturation temperature according to the suction saturation pressure; calculate the suction superheat according to the suction temperature and the suction saturation temperature.

[0127] Specifically, in the embodiments of the present application, the suction superheat Tg = the suction temperature T4 - the suction saturation temperature T3. The suction temperature T4 is detected in real time by the suction temperature sensor 76, and the suction saturation temperature T3 is obtained by calculating the suction saturation pressure P3.

[0128] In some embodiments, the third preset value is -3.

[0129] In this way, when the suction superheat is greater than -3, the impact on the normal operation of the air source heat pump 100 is relatively small. Selecting -3 as the third preset value can reduce the ash removal frequency while ensuring that the air source heat pump 100 is not affected, and avoid energy waste caused by excessive frequency.

[0130] Specifically, when the suction superheat is greater than -3 for ash removal, the performance degradation of the heat exchanger may not be obvious, so the impact on the overall system is relatively small. Although the cleanliness of the heat exchanger can be maintained, frequent cleaning will increase the maintenance cost. When the suction superheat is less than or equal to -3, the performance of the heat exchanger has begun to degrade significantly, resulting in increased system energy consumption and operating costs. At this time, ash removal can restore most of its performance and avoid the cost increase caused by premature and frequent ash removal.

[0131] Therefore, in the embodiments of the present application, the third preset value is -3, that is, when the suction superheat is less than or equal to -3, ash removal of the outdoor heat exchanger 44 can be considered.

[0132] Please refer to Figure 9 , in some embodiments, a throttling component 50 is connected between the indoor heat exchanger 61 and the outdoor heat exchanger 44. Step 05 includes:

[0133] 051: After confirming that the outdoor heat exchanger is dirty and blocked, determine whether the ash removal condition is satisfied;

[0134] 052: When the ash removal condition is met, control the switching of the four-way reversing valve so that the refrigerant flows in the direction of compressor - indoor heat exchanger - throttling component - outdoor heat exchanger, and start timing the first operation duration of the compressor;

[0135] 053: When the first operation duration is greater than or equal to the first preset time, and the difference between the outdoor temperature and the outlet temperature is greater than or equal to the first preset temperature and lasts for the second preset time, control the switching of the four-way reversing valve so that the refrigerant flows in the direction of compressor - outdoor heat exchanger - throttling component - indoor heat exchanger. At the same time, control the outdoor fan to turn on and restart timing the second operation duration of the compressor;

[0136] 054: When the second operation duration is greater than or equal to the third preset time, and the difference in the outlet temperature is greater than or equal to the second preset temperature and lasts for the fourth preset time, the ash removal ends.

[0137] In this way, frosting and then defrosting can occur on the outer surface of the outdoor heat exchanger 44, and the water flow during defrosting can wash away the dust on the outdoor heat exchanger 44, achieving the effect of automatic ash removal.

[0138] In some embodiments, sub-steps 051, 052, 053, and 054 can be implemented by the judgment module 15. Or rather, after the judgment module 15 is used to confirm that the outdoor heat exchanger 44 is dirty blocked, it judges whether the ash removal condition is met. When the ash removal condition is met, control the switching of the four-way reversing valve 43 so that the refrigerant flows in the direction of compressor 41 - indoor heat exchanger 61 - throttling component 50 - outdoor heat exchanger 44, and start timing the first operation duration of the compressor 41. When the first operation duration is greater than or equal to the first preset time, and the difference between the outdoor temperature and the outlet temperature is greater than or equal to the first preset temperature and lasts for the second preset time, control the switching of the four-way reversing valve 43 so that the refrigerant flows in the direction of compressor 41 - outdoor heat exchanger 44 - throttling component 50 - indoor heat exchanger 61. At the same time, control the outdoor fan to turn on and restart timing the second operation duration of the compressor 41. When the second operation duration is greater than or equal to the third preset time, and the difference in the outlet temperature is greater than or equal to the second preset temperature and lasts for the fourth preset time, the ash removal ends.

[0139] In some embodiments, after the processor 20 is used to confirm that the outdoor heat exchanger 44 is dirty and blocked, it determines whether the ash removal condition is satisfied; when the ash removal condition is satisfied, it controls the four-way reversing valve 43 to switch, so that the refrigerant flows along the direction of compressor 41 - indoor heat exchanger 61 - throttling component 50 - outdoor heat exchanger 44, and starts timing the first operation duration of the compressor 41; when the first operation duration is greater than or equal to the first preset time, and the difference between the outdoor temperature and the outlet temperature is greater than or equal to the first preset temperature for a continuous second preset time, it controls the four-way reversing valve 43 to switch, so that the refrigerant flows along the direction of compressor 41 - outdoor heat exchanger 44 - throttling component 50 - indoor heat exchanger 61, and at the same time controls the outdoor fan to turn on and starts timing the second operation duration of the compressor 41 again; when the second operation duration is greater than or equal to the third preset time, and the difference in the outlet temperature is greater than or equal to the second preset temperature for a continuous fourth preset time, the ash removal ends.

[0140] Specifically, in the embodiment of the present application, the throttling component 50 includes a first expansion valve 51, a check valve 52, and a second expansion valve 53. As Figure 4 shown, the first expansion valve 51 and the check valve 52 are in parallel. The outlet of the outdoor heat exchanger 44 is connected to the second expansion valve 53 through the first expansion valve 51 and the check valve 52. The second expansion valve 53 is connected to the indoor heat exchanger 61. The refrigerant can flow from the outdoor heat exchanger 44 to the indoor heat exchanger 61 along the check valve 52, and is cut off in the reverse direction.

[0141] Furthermore, when the ash accumulation degree is greater than or equal to 40%, the heat exchange temperature difference is greater than or equal to 5 degrees Celsius, and the suction superheat is less than or equal to -3, it is determined whether the ash removal condition is satisfied. After the ash removal condition is satisfied, the four-way reversing valve 43 is switched so that the A connection port is communicated with the C connection port, and the B connection port is communicated with the D connection port. At the same time, the second expansion valve 53 is opened to 480P, and the first expansion valve 51 is opened to 250P, so that the outdoor heat exchanger 44 starts to refrigerate.

[0142] After the refrigeration starts, timing begins. When both the first operation duration of the compressor 41 exceeds the first preset time and the difference between the outdoor temperature Th and the outlet temperature T2 is greater than the first preset temperature for a continuous second preset time, it controls the four-way reversing valve 43 to switch, so that the A connection port is communicated with the B connection port, and the C connection port is communicated with the D connection port. At the same time, the second expansion valve 53 is opened to 250P, the first expansion valve 51 is closed to 0P, and the outdoor fan is turned on to the maximum gear, so that the outdoor heat exchanger 44 starts to heat. The first preset time is 10 min, the first preset temperature is 15 °C, and the second preset time is 3 min. In this way, it can be ensured that enough frost can condense on the outdoor heat exchanger 44.

[0143] After the heating starts, the timing restarts. When the second running duration is greater than or equal to the third preset time, and the difference in the outlet temperature is greater than or equal to the second preset temperature for the fourth preset time, this ash removal is ended. The third preset time is 5 minutes, the second preset temperature is 10 °C, and the fourth preset time is 1 minute. In this way, it can be ensured that the generated frost can be fully melted, thereby taking away the dust on the outdoor heat exchanger 44 and completing the ash removal.

[0144] Please refer to Figure 10 , in some embodiments, sub-step 051 includes:

[0145] 0511: Obtain the outdoor relative humidity;

[0146] 0512: If the ambient temperature is less than the first preset temperature and the relative humidity is greater than the first relative humidity, the ash removal condition is met; or

[0147] 0513: If the ambient temperature is less than the second preset temperature and the relative humidity is greater than the second relative humidity, the ash removal condition is met; or

[0148] 0514: If the ambient temperature is less than the third preset temperature and the relative humidity is greater than the third relative humidity, the ash removal condition is met, otherwise the ash removal condition is not met.

[0149] In this way, at different ambient temperatures, the appropriate relative humidity should be selected to meet the frosting requirements of the outdoor heat exchanger 44, avoiding too little water flow during defrosting and incomplete ash removal.

[0150] In some embodiments, sub-steps 0511, 0512, 0513 and 0514 can be implemented by the judgment module 15. Or rather, the judgment module 15 can be used to obtain the outdoor relative humidity; if the ambient temperature is less than the first preset temperature and the relative humidity is greater than the first relative humidity, the ash removal condition is met; or if the ambient temperature is less than the second preset temperature and the relative humidity is greater than the second relative humidity, the ash removal condition is met; or if the ambient temperature is less than the third preset temperature and the relative humidity is greater than the third relative humidity, the ash removal condition is met, otherwise the ash removal condition is not met.

[0151] In some embodiments, the processor 20 can be used to obtain the outdoor relative humidity; if the ambient temperature is less than the first preset temperature and the relative humidity is greater than the first relative humidity, the ash removal condition is met; or if the ambient temperature is less than the second preset temperature and the relative humidity is greater than the second relative humidity, the ash removal condition is met; or if the ambient temperature is less than the third preset temperature and the relative humidity is greater than the third relative humidity, the ash removal condition is met, otherwise the ash removal condition is not met.

[0152] Specifically, at different ambient temperatures, different relative humidities need to be met to enable ash removal. In the embodiments of the present application, the first preset temperature is 12°C, the second preset temperature is 0°C, the third preset temperature is -7°C, the first relative humidity is 70%, the second relative humidity is 50%, and the third relative humidity is 40%. That is, when the ambient temperature is less than 12°C, the relative humidity needs to be greater than 70%. When the ambient temperature is less than 0°C, the relative humidity needs to be greater than 50%. When the ambient temperature is less than -7°C, the relative humidity needs to be greater than 40%. Otherwise, the frost formation amount required for ash removal cannot be satisfied, and the ash removal effect is poor.

[0153] Please refer to Figure 11 , in some embodiments, sub-step 052 includes:

[0154] 0521: Adjust the frequency of the compressor to 37 - 43 Hz;

[0155] 0522: After 5 seconds, control the four-way reversing valve to switch;

[0156] 0523: After 10 seconds, adjust the frequency of the compressor to 77 - 83 Hz, and start timing the first operation duration.

[0157] In this way, adjusting the compressor 41 to a smaller frequency before the four-way reversing valve 43 switches is beneficial to avoiding the impact on the four-way reversing valve 43 caused by too large a refrigerant flow rate. Adjusting the compressor 41 to a larger frequency again after the four-way reversing valve 43 switches is beneficial to improving the refrigeration efficiency.

[0158] In some embodiments, sub-steps 0521, 0522, and 0523 can be implemented by the judgment module 15. Or rather, the judgment module 15 can be used to adjust the frequency of the compressor 41 to 37 - 43 Hz; after 5 seconds, control the four-way reversing valve 43 to switch; after 10 seconds, adjust the frequency of the compressor 41 to 77 - 83 Hz, and start timing the first operation duration.

[0159] In some embodiments, the processor 20 can be used to adjust the frequency of the compressor 41 to 37 - 43 Hz; after 5 seconds, control the four-way reversing valve 43 to switch; after 10 seconds, adjust the frequency of the compressor 41 to 77 - 83 Hz, and start timing the first operation duration.

[0160] Specifically, in the embodiments of the present application, before adjusting the four-way reversing valve 43, the frequency of the compressor 41 should be adjusted to 40 HZ ± 3 HZ and stably operated for 5 s before switching. This is beneficial to avoiding the impact on the four-way reversing valve 43 caused by too large a refrigerant flow rate. After switching the four-way reversing valve 43, open the second expansion valve 53 to 480P and the first expansion valve 51 to 250P. After stably operating for another 10 s, raise the frequency of the compressor 41 to 80 HZ ± 3 HZ to improve the refrigeration efficiency of the outdoor heat exchanger 44.

[0161] Please refer to Figure 12 , in some embodiments, sub-step 053 includes:

[0162] 0531: Adjust the frequency of the compressor to 37 - 43 Hz;

[0163] 0532: After 5 seconds, control the four-way reversing valve to switch;

[0164] 0533: After 10 seconds, adjust the frequency of the compressor to 57 - 63 Hz and start timing the second operation duration.

[0165] In this way, adjusting the compressor 41 to a lower frequency before the four-way reversing valve 43 switches is beneficial to avoiding the impact on the four-way reversing valve 43 caused by excessive refrigerant flow rate. Adjusting the compressor 41 to a higher frequency again after the four-way reversing valve 43 switches is beneficial to improving the heating efficiency.

[0166] In some embodiments, sub-steps 0531, 0532, and 0533 can be implemented by the judgment module 15. Or rather, the judgment module 15 can be used to adjust the frequency of the compressor 41 to 37 - 43 Hz; after 5 seconds, control the four-way reversing valve 43 to switch; after 10 seconds, adjust the frequency of the compressor 41 to 57 - 63 Hz and start timing the second operation duration.

[0167] In some embodiments, the processor 20 can be used to adjust the frequency of the compressor 41 to 37 - 43 Hz; after 5 seconds, control the four-way reversing valve 43 to switch; after 10 seconds, adjust the frequency of the compressor 41 to 57 - 63 Hz and start timing the second operation duration.

[0168] Specifically, in the embodiments of the present application, similar to the frosting process, before adjusting the four-way reversing valve 43, the frequency of the compressor 41 should be adjusted to 40HZ ± 3HZ and run stably for 5s before switching. This is beneficial to avoiding the impact on the four-way reversing valve 43 caused by excessive refrigerant flow rate. After switching the four-way reversing valve 43, the second expansion valve 53 is opened to 250P, and the first expansion valve 51 is closed to 0P. After running stably for another 10s, the frequency of the compressor 41 is increased to 60HZ ± 3HZ to improve the heating efficiency of the outdoor heat exchanger 44. It should be noted that during defrosting, the frequency of the compressor 41 should not be too high to prevent liquid refrigerant from entering the compressor 41 and causing damage to the compressor 41.

[0169] The fourth embodiment of the present application provides a non-volatile computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor 20, the automatic dust removal method as described in any one of the above is implemented.

[0170] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a digital video disc (DVD)), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0171] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0172] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, unless otherwise specifically and clearly defined.

[0173] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An automatic dust removal method for an air source heat pump, wherein the air source heat pump comprises an indoor unit, an outdoor unit and a connecting pipe, wherein the indoor unit comprises an indoor heat exchanger, and the outdoor unit comprises a compressor, a four-way reversing valve, an outdoor heat exchanger and an outdoor fan, wherein the compressor, the four-way reversing valve, the outdoor heat exchanger and the indoor heat exchanger are connected through a connecting pipe to form a loop, wherein: The automatic dust removal method comprises: Obtaining the operating parameters of the air source heat pump, the operating parameters including ambient temperature, standard heat exchange temperature difference, inlet temperature, inlet pressure, outlet temperature, outlet pressure of the outdoor heat exchanger, and suction temperature and suction saturation pressure of the compressor; Calculating the dust accumulation degree of the outdoor heat exchanger according to the operating parameters; Calculating the heat exchange temperature difference of the outdoor heat exchanger according to the operating parameters; Calculating the suction superheat of the outdoor heat exchanger according to the operating parameters; When the dust accumulation degree is greater than or equal to a first preset value, the heat exchange temperature difference is greater than or equal to a second preset value, and the suction air superheat is less than or equal to a third preset value, it is confirmed that the outdoor heat exchanger is dirty and blocked and the outdoor heat exchanger is started to be deashed.

2. The automatic dust removal method according to claim 1, characterized in that: Calculating the dust accumulation degree of the outdoor heat exchanger according to the working parameters includes: Calculating the inlet enthalpy of the outdoor heat exchanger according to the inlet temperature and the inlet pressure; Calculating the outlet enthalpy of the outdoor heat exchanger according to the outlet temperature and the outlet pressure; Calculating the refrigerant flow rate according to the suction saturation pressure and the inlet temperature; Calculating the real-time capacity of the outdoor heat exchanger according to the inlet enthalpy value, the outlet enthalpy value and the refrigerant flow rate; The dust accumulation level is calculated based on the real-time capacity and the rated capacity of the outdoor heat exchanger.

3. The automatic dust removal method according to claim 1, characterized in that: The calculating of the refrigerant flow rate according to the suction saturation pressure and the inlet temperature comprises: Calculating the exhaust gas saturation temperature according to the inlet temperature; Calculating the suction saturation temperature according to the suction saturation pressure; The refrigerant flow rate is calculated according to the exhaust gas saturation temperature and the suction gas saturation temperature by using a compressor ten-coefficient model.

4. The automatic dust removal method according to claim 1, characterized in that: Calculating the heat exchange temperature difference of the outdoor heat exchanger according to the working parameters comprises: calculating the condensing temperature based on the inlet pressure; Calculating a real-time heat exchange temperature difference according to the condensing temperature and the ambient temperature; The heat exchange temperature difference value is calculated according to the real-time heat exchange temperature difference and the standard heat exchange temperature difference.

5. The automatic dust removal method according to claim 1, characterized in that: Calculating the suction superheat of the outdoor heat exchanger according to the working parameters comprises: Calculating the suction saturation temperature according to the suction saturation pressure; The suction gas superheat is calculated according to the suction gas temperature and the suction gas saturation temperature.

6. The automatic dust removal method according to claim 1, characterized in that: A throttling component is connected between the indoor heat exchanger and the outdoor heat exchanger, and the step of confirming that the outdoor heat exchanger is dirty and blocked and starting to remove dust from the outdoor heat exchanger includes: After confirming that the outdoor heat exchanger is dirty and blocked, determining whether the dust removal conditions are met; When the dust removal condition is met, the four-way reversing valve is controlled to switch so that the refrigerant flows in the direction of the compressor - the indoor heat exchanger - the throttling component - the outdoor heat exchanger, and the timing of the first operation time of the compressor is started; When the first operating time is greater than or equal to the first preset time, and the difference between the outdoor temperature and the outlet temperature is greater than or equal to the first preset temperature for a second preset time, the four-way reversing valve is controlled to switch so that the refrigerant flows in the direction of the compressor - the outdoor heat exchanger - the throttling component - the indoor heat exchanger, and the outdoor fan is controlled to turn on, and the timing of the second operating time of the compressor is restarted; When the second operation time is greater than or equal to the third preset time, and the difference in the outlet temperature is greater than or equal to the second preset temperature for a fourth preset time, the ash removal is completed.

7. The automatic dust removal method according to claim 6, characterized in that: After confirming that the outdoor heat exchanger is dirty and blocked, determining whether the dust removal conditions are met includes: Get the outdoor relative humidity; If the ambient temperature is lower than the first preset temperature and the relative humidity is higher than the first relative humidity, the dust removal condition is met; or If the ambient temperature is lower than the second preset temperature and the relative humidity is higher than the second relative humidity, the dust removal condition is met; or If the ambient temperature is lower than the third preset temperature and the relative humidity is higher than the third relative humidity, the dust removal condition is met; otherwise, the dust removal condition is not met.

8. An automatic dust removal device for an air source heat pump, the air source heat pump comprising an indoor unit, an outdoor unit and a connecting pipe, the indoor unit comprising an indoor heat exchanger, the outdoor unit comprising a compressor, a four-way reversing valve, an outdoor heat exchanger and an outdoor fan, the compressor, the four-way reversing valve, the outdoor heat exchanger and the indoor heat exchanger are connected through a connecting pipe to form a loop, characterized in that: The automatic dust removal device comprises: An acquisition module is used to acquire the operating parameters of the air source heat pump, wherein the operating parameters include the ambient temperature, the standard heat exchange temperature difference, the inlet temperature, the inlet pressure, the outlet temperature, the outlet pressure of the outdoor heat exchanger, and the suction temperature and the suction saturation pressure of the compressor; A first calculation module, used for calculating the dust accumulation degree of the outdoor heat exchanger according to the working parameters; A second calculation module, used for calculating the heat exchange temperature difference of the outdoor heat exchanger according to the working parameters; A third calculation module, used for calculating the suction superheat of the outdoor heat exchanger according to the working parameters; The judgment module is used to confirm that the outdoor heat exchanger is dirty and blocked and start to remove dust from the outdoor heat exchanger when the dust accumulation degree is greater than or equal to a first preset value, the heat exchange temperature difference is greater than or equal to a second preset value, and the suction superheat is less than or equal to a third preset value.

9. An air source heat pump, characterized in that: The air source heat pump includes an indoor unit, an outdoor unit and a connecting pipe, the indoor unit includes an indoor heat exchanger, the outdoor unit includes a compressor, a four-way reversing valve, an outdoor heat exchanger and an outdoor fan, the compressor, the four-way reversing valve, the outdoor heat exchanger and the indoor heat exchanger are connected by a connecting pipe to form a loop, the air source heat pump also includes a processor and a memory, the memory stores a computer program, when the computer program is executed by the processor, the processor implements the instructions of the automatic dust removal method as described in any one of claims 1-7.

10. A non-volatile computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the automatic dust removal method according to any one of claims 1 to 7 is implemented.

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