Control method and device of electronic expansion valve, air source water heater and storage medium

Abstract

The present application provides a control method, device, air source water heater and storage medium of an electronic expansion valve, the method relates to the field of heat pumps, the method is applied to an air source water heater, the air source water heater includes an outdoor heat exchanger, the outdoor heat exchanger is equipped with a temperature sensor, the method includes: obtaining the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor; controlling the air source water heater to enter an oil blockage prevention mode based on the outdoor ambient temperature; in the oil blockage prevention mode, determining the target saturated evaporation temperature of the refrigerant of the outdoor heat exchanger; adjusting the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature and the target saturated evaporation temperature. The method improves the heating efficiency of the heat exchanger by accurately controlling the flow of the refrigerant entering the outdoor heat exchanger, thereby enabling the lubricating oil to circulate more smoothly in the air source water heater to avoid oil blockage.

Description

Technical Field

[0001] The present application relates to the field of heat pumps, and more specifically, to a control method and device for an electronic expansion valve, an air source water heater, and a storage medium in the field of heat pumps. Background Art

[0002] Air source water heaters (air source heat pump water heaters) are a new type of green energy industry. Compared with traditional gas and electric water heaters, they are safer, energy-saving and environmentally friendly. When the outdoor ambient temperature is low, the low-temperature refrigerant and lubricating oil in the outdoor heat exchanger will flow into the indoor heat exchanger through the throttling device. At the same time, the flammable refrigerant is charged in a small amount for safety reasons, and the system pressure is low, resulting in high viscosity, which leads to oil blockage in the electronic expansion valve. Summary of the invention

[0003] The present application provides a control method, device, air source water heater and storage medium for an electronic expansion valve. The method improves the heating efficiency of the heat exchanger by accurately controlling the flow of refrigerant entering the outdoor heat exchanger, thereby allowing the lubricating oil to circulate more smoothly in the air source water heater to avoid oil blockage.

[0004] In a first aspect, a control method for an electronic expansion valve is provided, which is applied to an air source water heater. The air source water heater includes an outdoor heat exchanger, and the outdoor heat exchanger is equipped with a temperature sensor. The method includes: obtaining the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor; controlling the air source water heater to enter an oil blockage prevention mode based on the outdoor ambient temperature; in the oil blockage prevention mode, determining a target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger; and adjusting the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature and the target saturated evaporation temperature.

[0005] In an embodiment of the present application, after the air source water heater is controlled to enter the oil blockage prevention mode by the outdoor ambient temperature, the opening of the electronic expansion valve is controlled based on the outdoor ambient temperature, the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor, and the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger. By accurately controlling the flow of the refrigerant entering the outdoor heat exchanger, the heating efficiency of the heat exchanger is improved, thereby allowing the lubricating oil to circulate more smoothly in the air source water heater to avoid oil blockage.

[0006] In combination with the first aspect, in some possible implementations, adjusting the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature, and the target saturated evaporation temperature includes:

[0007] Determine the outdoor temperature range in which the outdoor ambient temperature is located; determine the saturated temperature range corresponding to the outdoor temperature range and the target saturated evaporation temperature, where there are multiple saturated temperature ranges; determine the target saturated temperature range corresponding to the refrigerant temperature among the multiple saturated temperature ranges; adjust the opening of the electronic expansion valve according to the target opening corresponding to the target saturated temperature range.

[0008] By adopting the above scheme, after obtaining the outdoor ambient temperature, the saturated temperature interval is determined based on the outdoor temperature interval of the outdoor ambient temperature and the target saturated evaporating temperature, and then the target saturated temperature interval of the refrigerant temperature is determined in the saturated temperature interval, and the opening of the electronic expansion valve is adjusted according to the target opening determined in the target saturated temperature interval. Since the target opening of the electronic expansion valve to be adjusted is determined in real time based on the outdoor ambient temperature, the target saturated evaporating temperature, and the refrigerant temperature, the opening of the electronic expansion valve can be accurately adjusted.

[0009] In combination with the first aspect, in some possible implementations, the target opening includes a first opening and a third opening, and the opening of the electronic expansion valve is adjusted according to the target opening corresponding to the target saturation temperature interval, including: if the target saturation temperature interval is the first saturation temperature interval, the opening of the electronic expansion valve is adjusted according to the first opening corresponding to the first saturation temperature interval; if the target saturation temperature interval is the second saturation temperature interval, the third opening corresponding to the second saturation temperature interval is determined based on the number of adjustments of the electronic expansion valve and the second opening corresponding to the second saturation temperature interval, and the opening of the electronic expansion valve is adjusted according to the third opening; and the number of adjustments of the electronic expansion valve is updated.

[0010] By adopting the above scheme, the target opening corresponding to the target saturation temperature range is determined, thereby achieving accurate determination of the target opening of the electronic expansion valve.

[0011] In combination with the first aspect, in some possible implementations, the adjustment times of the electronic expansion valve are updated, including: if the target saturation temperature interval is the first saturation temperature interval, the adjustment times of the electronic expansion valve are updated to an initial value; if the target saturation temperature interval is the second saturation temperature interval, the adjustment times of the electronic expansion valve are updated according to a preset value.

[0012] By adopting the above scheme, the target opening of the electronic expansion valve is dynamically updated by adjusting the number of times, which can more accurately match the actual needs of the air source water heater, improve the smoothness of the lubricating oil passing through the electronic expansion valve, and avoid oil blockage in the air source water heater.

[0013] In combination with the first aspect, in some possible implementations, after determining the target saturation temperature interval corresponding to the refrigerant temperature in multiple saturation temperature intervals, it also includes: if the target saturation temperature interval corresponding to the refrigerant temperature does not exist in the saturation temperature interval, controlling the air source water heater to exit the oil blockage prevention mode.

[0014] In combination with the first aspect, in some possible implementations, the air source water heater is controlled to enter the oil blockage prevention mode based on the outdoor ambient temperature, including: if the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the air source water heater is controlled to enter the oil blockage prevention mode; or, if the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, and the refrigerant temperature is less than or equal to the refrigerant temperature threshold, the air source water heater is controlled to enter the oil blockage prevention mode.

[0015] By adopting the above scheme, by determining that the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, and judging whether to control the air source water heater to enter the oil blockage prevention mode based on the outdoor ambient temperature and the refrigerant temperature, the air source water heater is controlled to enter the oil blockage prevention mode by the real-time detected outdoor ambient temperature and refrigerant temperature, thereby achieving accurate control of the air source water heater to enter the oil blockage prevention mode.

[0016] In combination with the first aspect, in some possible implementations, a pressure sensor is also installed at the refrigerant outlet of the outdoor heat exchanger to determine the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger, including: obtaining the pressure value of the refrigerant flowing out of the outdoor heat exchanger collected by the pressure sensor; determining the saturated evaporation temperature corresponding to the pressure value, determining the target saturated evaporation temperature based on the saturated evaporation temperature, and there are multiple saturated evaporation temperatures; determining the target saturated evaporation temperature based on the mapping relationship between the outdoor ambient temperature and the target saturated evaporation temperature.

[0017] By adopting the above scheme, the saturated evaporation temperature is determined by a pressure sensor, and the target saturated evaporation temperature is further determined by the saturated evaporation temperature, or the target saturated evaporation temperature is determined by a mapping relationship between the outdoor ambient temperature and the target saturated temperature, thereby achieving accurate determination of the target saturated evaporation temperature.

[0018] In combination with the first aspect, in some possible implementations, determining the target saturated evaporation temperature based on the saturated evaporation temperature includes: determining an average value of the saturated evaporation temperatures as the target saturated evaporation temperature.

[0019] By adopting the above scheme, the target saturated evaporation temperature is determined by obtaining the average value of multiple saturated evaporation temperatures, thereby avoiding determining the target saturated evaporation temperature by a single saturated evaporation temperature, thereby improving the accuracy of determining the target saturated evaporation temperature.

[0020] In a second aspect, a control device for an electronic expansion valve is provided, the device comprising:

[0021] An acquisition unit, used to acquire the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor;

[0022] A control unit, used for controlling the air source water heater to enter an oil blockage prevention mode based on an outdoor ambient temperature;

[0023] A determination unit, used for determining a target saturated evaporation temperature of a refrigerant of an outdoor heat exchanger in an oil blockage prevention mode;

[0024] The adjustment unit is used to adjust the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature and the target saturated evaporation temperature.

[0025] In a third aspect, an air source water heater is provided, comprising:

[0026] A memory for storing executable program codes;

[0027] The processor is used to call and run the executable program code from the memory, so that the air source water heater executes the method in the above-mentioned first aspect or any possible implementation of the first aspect.

[0028] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0029] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an air source water heater provided in an embodiment of the present application;

[0031] Figure 2 It is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application;

[0032] Figure 3 It is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application;

[0033] Figure 4 It is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application;

[0034] Figure 5 It is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application;

[0035] Figure 6 is a structural schematic diagram of a control device for an electronic expansion valve provided in an embodiment of the present application;

[0036] Figure 7 is a structural schematic diagram of a control device for an electronic expansion valve provided in an embodiment of the present application;

[0037] Figure 8 It is a structural schematic diagram of an air source water heater provided in an embodiment of the present application.

[0038] Reference numerals:

[0039] DETAILED DESCRIPTION

[0040] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0041] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0042] Figure 1 It is a schematic diagram of the system structure of an air source water heater provided in an embodiment of the present application.

[0043] When the amount of flammable refrigerant charged is small for safety reasons, the system pressure of the air source water heater is small, the viscosity of the lubricating oil increases, and it is easy to accumulate at the electronic expansion valve to form oil blockage. And after the defrost mode ends, the air source water heater returns to the heating mode, but the low-temperature refrigerant and lubricating oil may still remain in the system. At this time, if high water temperature and low pressure difference coexist, the lubricating oil may accumulate at the throttling device again, causing oil blockage.

[0044] Based on this, a control method of an electronic expansion valve is proposed in the embodiment of the present application, which is applied to an air source water heater. The main structure of the air source water heater is as follows: Figure 1 shown.

[0045] The air source water heater includes a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an outdoor heat exchanger 7, a first filter 4, a second filter 6, and an electronic expansion valve 5. At least two temperature sensors (refrigerant temperature sensor 8 and outdoor temperature sensor) are installed in the outdoor heat exchanger 7, wherein the refrigerant temperature sensor 8 collects the refrigerant temperature at the evaporation side outlet outside the non-subcooling flow path of the outdoor heat exchanger 7, and the outdoor temperature sensor (not shown in the figure) obtains the outdoor ambient temperature. After the air source water heater is controlled to enter the oil blockage prevention mode based on the outdoor ambient temperature, the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger is determined in the oil blockage prevention mode, and then the opening of the electronic expansion valve 5 is controlled by the refrigerant temperature, the outdoor ambient temperature and the target saturated evaporation temperature.

[0046] Furthermore, the air source water heater also includes a pressure sensor 9, which is installed between the outdoor heat exchanger 7 and the four-way valve 2. When the outdoor heat exchanger serves as an evaporator, the pressure value of the refrigerant flowing from the outdoor heat exchanger 7 to the four-way valve 2 is obtained, and the saturated evaporation temperature of the refrigerant is obtained according to the pressure value. The saturated evaporation temperature of the refrigerant is determined by the actual detected pressure value of the refrigerant, and the saturated evaporation temperature of the refrigerant can be accurately obtained.

[0047] Furthermore, the air source water heater also includes an outdoor temperature sensor, which is installed on the outdoor heat exchanger 7 to obtain the outdoor ambient temperature of the air source water heater. In the embodiment of the present application, the outdoor ambient temperature of the air source water heater is directly obtained by the outdoor temperature sensor, and the outdoor ambient temperature of the air source water heater can be accurately obtained. Based on this, the air source water heater can be accurately controlled to enter the oil blockage prevention mode according to the outdoor ambient temperature, and after entering the oil blockage prevention mode, the opening of the electronic expansion valve can be accurately adjusted to prevent oil blockage in the air source water heater.

[0048] In an embodiment of the present application, after the air source water heater is controlled to enter the oil blockage prevention mode by the outdoor ambient temperature, the opening of the electronic expansion valve is controlled based on the outdoor ambient temperature, the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor, and the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger. By accurately controlling the flow of the refrigerant entering the outdoor heat exchanger, the heating efficiency of the heat exchanger is improved, thereby allowing the lubricating oil to circulate more smoothly in the air source water heater to avoid oil blockage.

[0049] based on Figure 1 The structure shown is shown below. Figure 2-Figure 8 , the control method of the electronic expansion valve provided in the embodiment of the present application is introduced in detail.

[0050] See also Figure 2 , is a flow chart of a method for controlling an electronic expansion valve provided in an embodiment of the present application. Figure 2As shown, the method of the embodiment of the present application may include the following steps S101-S104.

[0051] S101, obtaining the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor;

[0052] In one embodiment, the outdoor ambient temperature refers to the ambient temperature of the outdoor heat exchanger of the air source water heater. The working principle of the air source water heater is to absorb low-grade heat energy in the air, convert it into high-temperature heat energy after compression by a compressor, and then heat water. The outdoor ambient temperature is an important factor affecting the realization of this process.

[0053] In one implementation, the outdoor ambient temperature may be directly obtained by using an outdoor ambient temperature sensor.

[0054] In another embodiment, the outdoor ambient temperature can be obtained by networking to obtain the outdoor ambient temperature of the location where the air source water heater is located.

[0055] Refrigerant temperature is one of the factors that affect the oil blockage problem of air source water heaters. If the refrigerant temperature at the outlet of the outdoor heat exchanger is too low, it may cause the lubricating oil to condense or accumulate in the evaporator, causing oil blockage in the air source water heater. Therefore, in this embodiment of the application, it is necessary to obtain the refrigerant temperature of the outdoor heat exchanger.

[0056] S102, controlling the air source water heater to enter an oil blockage prevention mode based on the outdoor ambient temperature;

[0057] In one embodiment, after obtaining the outdoor ambient temperature, the air source water heater can directly control the air source water heater to enter the oil blockage prevention mode according to the outdoor ambient temperature. Specifically, the air source water heater can be controlled to enter the oil blockage prevention mode when the outdoor ambient temperature meets the preset temperature condition. For example, the preset temperature condition can be: the outdoor ambient temperature is less than 7 degrees Celsius (℃), then when the outdoor temperature sensor obtains that the outdoor ambient temperature is less than 7℃, it is determined that the preset temperature condition is met, and the air source water heater is controlled to enter the oil blockage prevention mode.

[0058] The oil blockage prevention mode refers to a mode for preventing oil blockage of the air source water heater.

[0059] S103, in the oil blockage prevention mode, determining a target saturated evaporation temperature of the refrigerant of the outdoor heat exchanger;

[0060] In one embodiment, after the air source water heater enters the oil blockage prevention mode, it determines the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger. The target saturated evaporation temperature refers to the temperature that the refrigerant needs to reach in the outdoor heat exchanger to change from liquid to gas.

[0061] Optionally, in the embodiment of the present application, the target saturated evaporation temperature corresponding to the outdoor ambient temperature may be determined by a mapping relationship between the outdoor ambient temperature and the target saturated evaporation temperature.

[0062] Exemplarily, the mapping relationship between the outdoor ambient temperature and the target saturated evaporation temperature can be: y=ax+b; wherein y is the target saturated evaporation temperature, x is the outdoor ambient temperature, a is the coefficient between the outdoor temperature x and the target saturated evaporation temperature y, and b is the variable between the outdoor temperature x and the target saturated evaporation temperature y.

[0063] S104, adjusting the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature and the target saturated evaporation temperature.

[0064] In one embodiment, after the target saturated evaporation temperature is determined, the opening degree of the electronic expansion valve that needs to be adjusted can be determined according to the target saturated evaporation temperature, the outdoor ambient temperature, and the refrigerant temperature, and the electronic expansion valve can be adjusted according to the opening degree.

[0065] Optionally, in an embodiment of the present application, an adjustment model between the refrigerant temperature, the outdoor ambient temperature, the target saturated evaporating temperature and the opening of the electronic expansion valve that needs to be adjusted can be obtained through training sample data, and then after the refrigerant temperature, the outdoor ambient temperature, and the target saturated evaporating temperature are acquired in real time, the refrigerant temperature, the outdoor ambient temperature, and the target saturated evaporating temperature are directly input into the adjustment model to obtain the opening of the electronic expansion valve that needs to be adjusted, and the opening of the electronic expansion valve is adjusted according to the opening.

[0066] In an embodiment of the present application, after the air source water heater is controlled to enter the oil blockage prevention mode by the outdoor ambient temperature, the opening of the electronic expansion valve is controlled based on the outdoor ambient temperature, the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor, and the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger, thereby accurately controlling the flow of the refrigerant entering the outdoor heat exchanger and improving the heating efficiency of the heat exchanger. As a result, the lubricating oil can circulate more smoothly in the air source water heater to avoid oil blockage.

[0067] See also Figure 3 , is a flow chart of a method for controlling an electronic expansion valve provided in an embodiment of the present application. Figure 3 As shown, the method of the embodiment of the present application may include the following steps S201-S204.

[0068] S201, determining the outdoor temperature range in which the outdoor ambient temperature is located;

[0069] In one embodiment, the outdoor temperature interval refers to a temperature interval pre-divided for the outdoor ambient temperature. In the embodiment of the present application, the outdoor temperature interval includes a first outdoor temperature interval and a second outdoor temperature interval. For example, the first outdoor temperature interval may be (-7°C, 5°C], and the second outdoor temperature interval may be (-15°C, -7°C]. If the outdoor ambient temperature is -10°C, the outdoor temperature interval in which the outdoor ambient temperature is located is determined to be the second outdoor temperature interval; if the outdoor ambient temperature is 3°C, the outdoor temperature interval in which the outdoor ambient temperature is located is determined to be the first outdoor temperature interval.

[0070] S202, determining an outdoor temperature interval and a saturated temperature interval corresponding to a target saturated evaporation temperature, where there are multiple saturated temperature intervals;

[0071] In one embodiment, after determining the outdoor temperature range in which the outdoor ambient temperature is located, the saturated temperature range corresponding to the outdoor temperature range and the target saturated evaporation temperature is determined as follows: determining that the saturated temperature range corresponding to the first outdoor temperature range and the target saturated evaporation temperature includes a saturated temperature range A and a saturated temperature range B; determining that the saturated temperature range corresponding to the second outdoor temperature range and the target saturated evaporation temperature includes a saturated temperature range C and a saturated temperature range D.

[0072] Exemplarily, in the embodiment of the present application, determining the saturated temperature interval corresponding to the first outdoor temperature interval and the target saturated evaporation temperature may be as follows: determining the saturated temperature interval A and the saturated temperature interval B in the first outdoor ambient temperature interval according to the target saturated evaporation temperature and the first numerical value. For example, if the target saturated evaporation temperature is 0°C and the first numerical value is 5, then the saturated temperature interval A is determined to be (-5°C, 5°C], and the saturated temperature interval B is determined to be (-20°C, -5°C]. Determining the saturated temperature interval corresponding to the second outdoor temperature interval and the target saturated evaporation temperature may be as follows: determining the saturated temperature interval C and the saturated temperature interval D in the second outdoor temperature interval according to the target saturated evaporation temperature and the second numerical value. For example, if the target saturated evaporation temperature is 0°C and the second numerical value is 10, then determining the saturated temperature interval C to be (-10°C, -6°C], and the saturated temperature interval D to be (-40°C, -10°C], wherein the first numerical value and the second numerical value are set parameter thresholds, and optionally, the first numerical value is determined according to the first outdoor ambient temperature interval, and the second numerical value is determined according to the second outdoor ambient temperature interval.

[0073] S203, determining a target saturation temperature interval corresponding to the refrigerant temperature in a plurality of saturation temperature intervals;

[0074] S204: adjusting the opening of the electronic expansion valve according to the target opening corresponding to the target saturation temperature range.

[0075] In one embodiment, after determining multiple saturation temperature intervals, a target saturation temperature interval corresponding to the refrigerant temperature is determined, and the opening of the electronic expansion valve is adjusted according to the target opening corresponding to the target saturation temperature interval, wherein the target opening is the opening required to be adjusted by the electronic expansion valve within a certain time period, which includes a first opening and a third opening. In the embodiment of the present application, the saturation temperature intervals obtained under different outdoor temperature intervals are divided into a first saturation temperature interval and a second saturation temperature interval, and then the first opening of the electronic expansion valve corresponding to the first saturation temperature interval is determined, and the third opening of the electronic expansion valve corresponding to the second saturation temperature interval is determined, wherein the third opening of the electronic expansion valve corresponding to the second saturation temperature interval is determined based on the number of adjustments of the electronic expansion valve and the second opening corresponding to the second saturation temperature interval.

[0076] Exemplarily, when the outdoor temperature interval where the outdoor ambient temperature is located is the first outdoor temperature interval, the saturated temperature interval A is determined to be (-5°C, 5°C] as the first saturated temperature interval, and the saturated temperature interval B is determined to be (-20°C, -5°C] as the second saturated temperature interval; when the outdoor temperature interval where the outdoor ambient temperature is located is the second outdoor temperature interval, the saturated temperature interval C is determined to be (-10°C, -6°C] as the first saturated temperature interval, and the saturated temperature interval D is determined to be (-40°C, -10°C] as the second saturated temperature interval. Among them, the first opening of the electronic expansion valve corresponding to the first saturated temperature interval is the first fixed number of steps required to be adjusted within the first time period; the third opening of the electronic expansion valve corresponding to the second saturated temperature interval is n times the second fixed number of steps required to be adjusted within the second time period, wherein n is the number of adjustments of the electronic expansion valve, the first fixed number of steps may be the initial fixed number of steps, and the second fixed number of steps is the second opening corresponding to the current second saturated temperature interval.

[0077] Optionally, in an embodiment of the present application, the opening of the electronic expansion valve corresponding to the first saturation temperature interval can be controlled differently in different outdoor temperature intervals of the outdoor ambient temperature. For example, the target opening of the electronic expansion valve corresponding to the first saturation temperature interval of the first outdoor temperature interval is determined to be +8P / 15s (increasing the opening by 8 steps within 15 seconds); and the target opening of the electronic expansion valve corresponding to the first saturation temperature interval of the second outdoor temperature interval is determined to be +12P / 15s.

[0078] Therefore, the target opening (first opening or third opening) required to be adjusted for the electronic expansion valve can be obtained through the above scheme. After adjusting the opening of the electronic expansion valve according to the first opening or the third opening, the adjustment times of the electronic expansion valve are updated.

[0079] Further, in an embodiment of the present application, the updating of the adjustment times of the electronic expansion valve can be specifically that if the target saturation temperature interval is the first saturation temperature interval, the updating of the adjustment times of the electronic expansion valve is the initial value; if the target saturation temperature interval is the second saturation temperature interval, the updating of the adjustment times of the electronic expansion valve is according to a preset value, the preset value is a pre-set value, exemplarily, the preset value is 1.

[0080] For example, if the outdoor ambient temperature is 3°C, that is, the outdoor temperature interval in which the outdoor ambient temperature is located is the first outdoor temperature interval, and the target saturated evaporation temperature is 0°C, then the first saturated temperature interval corresponding to the first outdoor temperature interval is determined to be (-5°C, 5°C], and the second saturated temperature interval corresponding to the first outdoor temperature interval is (-20°C, -5°C]. In one case, if the refrigerant temperature is 0°C, the refrigerant temperature is in the first saturated temperature interval, that is, the target saturated temperature interval corresponding to the refrigerant temperature is determined to be the first saturated temperature interval, and then the first opening of the electronic expansion valve to be adjusted is determined to be +8P / 1 5s, and updates the adjustment times of the electronic expansion valve to the initial value. Exemplarily, the initial value can be 1; in another case, if the refrigerant temperature is -10°C, the refrigerant temperature is in the second saturation temperature range, that is, the target saturation temperature range corresponding to the refrigerant temperature is determined to be the second saturation temperature range, and then the third opening of the electronic expansion valve to be adjusted is determined to be +(16*n)P / 10s. If it is the first time to adjust the opening of the electronic expansion valve, that is, n is equal to 1, then the third opening of the electronic expansion valve to be adjusted is determined to be +(16*n)P / 10s, and then the adjustment times of the electronic expansion valve is set to 2.

[0081] Further, in the embodiment of the present application, if it is determined that there is no target saturation temperature interval corresponding to the refrigerant temperature, the air source water heater exits the oil blockage prevention mode. For example, when it is determined that the refrigerant temperature is 7°C, it is determined that there is no target saturation temperature interval corresponding to the refrigerant temperature (7°C) in the saturation temperature interval, and the air source water heater exits the oil blockage prevention mode.

[0082] In an embodiment of the present application, after obtaining the outdoor ambient temperature, the saturated temperature interval is determined based on the outdoor temperature interval in which the outdoor ambient temperature is located and the target saturated evaporation temperature, and then the target saturated temperature interval in which the refrigerant temperature is located is determined in the saturated temperature interval, and the opening of the electronic expansion valve is adjusted according to the target opening determined in the target saturated temperature interval. Since the target opening of the electronic expansion valve to be adjusted is determined in real time based on the outdoor ambient temperature, the target saturated evaporation temperature, and the refrigerant temperature, the opening of the electronic expansion valve can be accurately adjusted; and the corresponding target opening corresponding to the target saturated temperature interval is determined, thereby accurately determining the target opening of the electronic expansion valve; and the target opening of the electronic expansion valve is dynamically updated by adjusting the number of times, which can more accurately match the actual needs of the air source water heater, improve the smoothness of the lubricating oil passing through the electronic expansion valve, and avoid oil blockage in the air source water heater.

[0083] See also Figure 4 , is a flow chart of a method for controlling an electronic expansion valve provided in an embodiment of the present application. Figure 4 As shown, the method of the embodiment of the present application may include the following steps S301-S307.

[0084] S301, obtaining the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor;

[0085] For details, please refer to the description of step S101 in the above embodiment of the specification, which will not be elaborated here.

[0086] S302, if the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the air source water heater is controlled to enter the oil blockage prevention mode; or,

[0087] It is understandable that during the operation of the compressor, the refrigeration oil and the refrigerant are mixed to participate in the refrigerant circulation. In a low temperature environment, the viscosity of the refrigeration oil increases and is easily retained in the electronic expansion valve, causing oil blockage in the air source water heater. Therefore, when it is determined that the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the air source water heater can be controlled to enter the oil blockage prevention mode. Exemplarily, the outdoor ambient temperature threshold can be 7°C. If the outdoor ambient temperature is 5°C, which is less than the outdoor ambient temperature threshold, the air source water heater is controlled to enter the oil blockage prevention mode.

[0088] S303, if the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, and the refrigerant temperature is less than or equal to the refrigerant temperature threshold, the air source water heater is controlled to enter the oil blockage prevention mode;

[0089] In one embodiment, when the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the refrigerant temperature detected by the temperature sensor can be further acquired. When the refrigerant temperature is less than or equal to the refrigerant temperature threshold, it is determined that the air source water heater is likely to be blocked by oil, and the air source water heater is controlled to enter the oil blockage prevention mode. Exemplarily, the outdoor ambient temperature threshold can be 7°C, and the refrigerant temperature threshold can be -3°C. When the outdoor ambient temperature is 5°C and the refrigerant temperature is -5°C, the air source water heater is controlled to enter the oil blockage prevention mode.

[0090] Further, in the embodiment of the present application, the air source water heater can also determine whether to enter the oil blockage prevention mode according to the difference between the ambient temperature and the refrigerant temperature, or the rate of change of the difference between the ambient temperature and the refrigerant temperature. For example, when the difference between the ambient temperature and the refrigerant temperature is greater than the difference threshold, it is determined to enter the oil blockage prevention mode; or, when the rate of change of the difference between the ambient temperature and the refrigerant temperature is increasing, it is determined to enter the oil blockage prevention mode. By determining whether the air source water heater enters the oil blockage prevention mode according to the rate of change of the difference between the ambient temperature and the refrigerant temperature, the air source water heater can be controlled to enter the oil blockage prevention mode according to the change of the difference between the ambient temperature and the refrigerant temperature within a period of time, thereby improving the accuracy of the air source water heater in determining whether it enters the oil blockage prevention mode.

[0091] S304, in the oil blockage prevention mode, obtaining a pressure value of the refrigerant flowing out of the outdoor heat exchanger collected by the refrigerant pressure sensor;

[0092] In one embodiment, a pressure sensor is also installed at the refrigerant outlet of the outdoor heat exchanger of the air source water heater, which can detect the pressure value of the refrigerant flowing out of the outdoor heat exchanger.

[0093] S305, determining a saturated evaporation temperature corresponding to the pressure value, and determining a target saturated evaporation temperature based on the saturated evaporation temperature, where there are multiple saturated evaporation temperatures;

[0094] In one embodiment, a relationship table of saturated evaporation temperatures corresponding to different pressure values ​​may be pre-stored in the air source water heater, so that after the air source water heater obtains the pressure value, the saturated evaporation temperature corresponding to the pressure value may be determined, and then the target saturated evaporation temperature may be determined based on the saturated evaporation temperature.

[0095] Furthermore, in the present application, there are multiple saturated evaporation temperatures, and the target saturated evaporation temperature can be determined according to the average value of the multiple saturated evaporation temperatures. For example, if the saturated evaporation temperatures are 10°C, 6°C, and 5°C, the target saturated evaporation temperature can be 8°C.

[0096] Optionally, in an embodiment of the present application, the air source water heater can also determine whether to enter the oil blockage prevention mode based on the difference between the saturated evaporating temperature and the outdoor ambient temperature, and the rate of change of the difference between the saturated evaporating temperature and the outdoor ambient temperature.

[0097] S306, adjusting the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature and the target saturated evaporation temperature.

[0098] In an embodiment of the present application, by determining that the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, and judging whether to control the air source water heater to enter the oil blockage prevention mode based on the outdoor ambient temperature and the refrigerant temperature, the air source water heater is controlled to enter the oil blockage prevention mode by the real-time detected outdoor ambient temperature and the refrigerant temperature, thereby accurately controlling the air source water heater to enter the oil blockage prevention mode; and determining the saturated evaporation temperature by a pressure sensor, and further determining the target saturated evaporation temperature by the saturated evaporation temperature, or determining the target saturated evaporation temperature by a mapping relationship between the outdoor ambient temperature and the target saturated temperature, thereby accurately determining the target saturated evaporation temperature; determining the target saturated evaporation temperature by obtaining the average value of multiple saturated evaporation temperatures, avoiding determining the target saturated evaporation temperature by a single saturated evaporation temperature, and improving the accuracy of determining the target saturated evaporation temperature.

[0099] The following will be combined Figure 5 The control method of the electronic expansion valve provided in the embodiment of the present application is described in detail with reference to a specific example.

[0100] S1, the air source water heater collects the outdoor ambient temperature and determines whether the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold (exemplarily, T1 represents the outdoor temperature, and the outdoor ambient temperature threshold can be 5°C). If so, it is determined to enter the oil blockage prevention mode and execute S2; if not, it is determined that it is not necessary to enter the oil blockage prevention mode (omitted in the figure); S2, obtain the changing trend of the outdoor ambient temperature. If the changing trend of the outdoor ambient temperature is an upward trend, if so, further determine the outdoor temperature range in which the outdoor ambient temperature is located and execute S3; if not, it is determined that it is not necessary to enter the oil blockage prevention mode (omitted in the figure); S3, if the outdoor ambient temperature is in the first outdoor temperature range (exemplarily, -7°C<T1≤5°C), the corresponding saturated temperature range is determined according to the first outdoor temperature range and the target saturated evaporation temperature, and enter S4. Specifically, in the first outdoor temperature range, the saturated temperature range A and the saturated temperature range B are determined according to the target saturated evaporation temperature and the first numerical value; if the outdoor ambient temperature is not in the first outdoor temperature range, enter S10. S10, if the outdoor ambient temperature is in the second outdoor temperature range (exemplarily, -15℃<T1≤-7℃), determine the corresponding saturated temperature range according to the second outdoor temperature range and the target saturated evaporation temperature, and enter S11. Specifically, within the second outdoor temperature range, determine the saturated temperature range C and the saturated temperature range D according to the target saturated evaporation temperature and the second value; if not, enter S17.S4, if the refrigerant temperature T2 is in the saturation temperature range A (i.e., -12℃<T2≤-11℃), enter S5; if not, enter S7; S5, determine that the target opening of the electronic expansion valve to be adjusted is +8P / 15s, enter S6; S6, update the adjustment times of the electronic expansion valve to the initial value (i.e., n=1); S7, if the refrigerant temperature T2 is in the saturation temperature range B (i.e., T2≤-12℃), if yes, enter S8; if not, return to execute S1; S8, determine that the target opening of the electronic expansion valve to be adjusted is +(16*n)P / 10s, enter S9; S9, update the adjustment times of the electronic expansion valve according to the preset value (i.e., n=n+1); S11, if the refrigerant temperature T2 is in the saturation temperature range C (i.e., -17 ℃<T2≤-16.5℃), then enter S12; if not, enter S14; S12, determine that the target opening of the electronic expansion valve to be adjusted is +8P / 15s, and enter S13; S13, update the adjustment times of the electronic expansion valve to the initial value (i.e., n=1); S14, if the refrigerant temperature T2 is in the saturation temperature range D (i.e., T2≤-17℃), then enter S15, if not, enter S17; S15, determine that the target opening of the electronic expansion valve to be adjusted is +(16*n)P / 10s, and enter S16; S16, update the adjustment times of the electronic expansion valve according to the preset value (i.e., n=n+1); S17, if it is determined that there is no target saturation temperature range corresponding to the refrigerant temperature, the air source water heater exits the oil blockage prevention mode.

[0101] In an embodiment of the present application, after the air source water heater is controlled to enter the oil blockage prevention mode by the outdoor ambient temperature, the opening of the electronic expansion valve is controlled based on the outdoor ambient temperature, the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor, and the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger, thereby accurately controlling the flow of the refrigerant entering the outdoor heat exchanger and improving the heating efficiency of the heat exchanger. As a result, the lubricating oil can circulate more smoothly in the air source water heater to avoid oil blockage.

[0102] based on Figure 1 The structural diagram of Figure 6-Figure 7 , the control device of the electronic expansion valve provided in the embodiment of the present application is introduced in detail. It should be noted that, Figure 6-Figure 7 The electronic expansion valve control device is used to implement the present application Figure 2-Figure 5 For the convenience of explanation, only the part related to the embodiment of the present application is shown. For the specific technical details not disclosed, please refer to the present application. Figure 2-Figure 5 The embodiment shown.

[0103] The control device of the electronic expansion valve includes: an acquisition unit 11 , a control unit 12 , a determination unit 13 , and an adjustment unit 14 .

[0104] An acquisition unit 11 is used to acquire the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor;

[0105] A control unit 12, for controlling the air source water heater to enter an oil blockage prevention mode based on the outdoor ambient temperature;

[0106] A determination unit 13, used to determine a target saturated evaporation temperature of the refrigerant of the outdoor heat exchanger in the oil blockage prevention mode;

[0107] The adjustment unit 14 is used to adjust the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature and the target saturated evaporation temperature.

[0108] Optionally, the adjusting unit 14 specifically includes:

[0109] A first determining subunit 141 is used to determine the outdoor temperature interval in which the outdoor ambient temperature is located;

[0110] The second determination subunit 142 is used to determine the outdoor temperature interval and the saturated temperature interval corresponding to the target saturated evaporation temperature, and there are multiple saturated temperature intervals;

[0111] The third determining subunit 143 is used to determine a target saturation temperature interval corresponding to the refrigerant temperature in a plurality of saturation temperature intervals;

[0112] The adjusting subunit 144 is used to adjust the opening of the electronic expansion valve according to the target opening corresponding to the target saturation temperature range.

[0113] Optionally, the adjusting subunit 144 is specifically configured to:

[0114] If the target saturation temperature interval is the first saturation temperature interval, adjusting the opening of the electronic expansion valve according to the first opening corresponding to the first saturation temperature interval;

[0115] If the target saturation temperature interval is the second saturation temperature interval, determining a third opening corresponding to the second saturation temperature interval based on the number of adjustments of the electronic expansion valve and the second opening corresponding to the second saturation temperature interval, and adjusting the opening of the electronic expansion valve according to the third opening;

[0116] Update the adjustment times of the electronic expansion valve.

[0117] Optionally, the adjusting subunit 144 is specifically configured to:

[0118] If the target saturation temperature interval is the first saturation temperature interval, the adjustment times of the electronic expansion valve are updated to the initial value;

[0119] If the target saturation temperature interval is the second saturation temperature interval, the adjustment times of the electronic expansion valve are updated according to the preset value.

[0120] Optionally, the control device of the electronic expansion valve further includes:

[0121] The exit unit 15 is used to control the air source water heater to exit the oil blockage prevention mode if the target saturation temperature interval corresponding to the refrigerant temperature does not exist in the saturation temperature interval.

[0122] Optionally, the control unit 12 further includes: a first control subunit 121 and a second control subunit 122 .

[0123] The first control subunit 121 is used to control the air source water heater to enter the oil blockage prevention mode if the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold; or

[0124] The second control subunit 122 is used to control the air source water heater to enter the oil blockage prevention mode if the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold and the refrigerant temperature is less than or equal to the refrigerant temperature threshold.

[0125] Optionally, the determining unit 13 includes: a fourth determining subunit 131 and a fifth determining subunit 132 .

[0126] The fourth determining subunit 131 is used to obtain the pressure value of the refrigerant flowing out of the outdoor heat exchanger collected by the pressure sensor;

[0127] The fifth determining subunit 132 is used to determine the saturated evaporation temperature corresponding to the pressure value, and determine the target saturated evaporation temperature based on the saturated evaporation temperature. There are multiple saturated evaporation temperatures.

[0128] Optionally, the fifth determining subunit 132 is specifically configured to:

[0129] The average value of the saturated evaporation temperature is determined as the target saturated evaporation temperature.

[0130] In an embodiment of the present application, after the air source water heater is controlled to enter the oil blockage prevention mode by the outdoor ambient temperature, the opening of the electronic expansion valve is controlled based on the outdoor ambient temperature, the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor, and the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger, thereby accurately controlling the flow of the refrigerant entering the outdoor heat exchanger and improving the heating efficiency of the heat exchanger. As a result, the lubricating oil can circulate more smoothly in the air source water heater to avoid oil blockage.

[0131] See also Figure 6 , is a schematic diagram of the structure of an air source water heater provided in the embodiment of the present application. Figure 5 As shown, the air source water heater 500 includes a processor 501 and a memory 502. The processor 501 is electrically connected to the memory 502.

[0132] The processor 501 is the control center of the air source water heater 500 and may include one or more processing cores. The processor 501 uses various interfaces and lines to connect various parts of the entire air source water heater 500, and executes various functions and processes data of the air source water heater 500 by running or calling computer programs stored in the memory 502, and calling data stored in the memory 502, so as to control the air source water heater 500 as a whole. Optionally, the processor 501 can be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 501 can integrate one or a combination of CPU, graphics processing unit (GPU), modem, etc. Among them, the CPU mainly processes the operating system, user pages, and applications; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 501, but may be implemented separately through a communication chip.

[0133] The memory 502 can be used to store software programs and modules, and the processor 501 executes various functional applications and data processing by running the computer programs and modules stored in the memory 502. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, a computer program required for at least one function, etc.; the data storage area can store data created according to the use of the air source water heater 500, etc.

[0134] In addition, the memory 502 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory 502 may also include a memory controller to provide the processor 501 with access to the memory 502.

[0135] In this embodiment, the processor 501 in the air source water heater 500 will load the instructions corresponding to the processes of one or more computer programs into the memory 502 according to the following steps, and the processor 501 will run the computer program stored in the memory 502 to implement various functions, as follows:

[0136] Obtain the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor;

[0137] Control the air source water heater to enter the oil blockage prevention mode based on the outdoor ambient temperature;

[0138] In the oil blockage prevention mode, determine the target saturated evaporation temperature of the refrigerant in the outdoor heat exchanger;

[0139] The opening of the electronic expansion valve is adjusted based on the refrigerant temperature, outdoor ambient temperature and target saturated evaporation temperature.

[0140] Optionally, when the processor 501 adjusts the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor ambient temperature, and the target saturated evaporation temperature, the processor 501 specifically performs:

[0141] Determine the outdoor temperature range in which the outdoor ambient temperature is located;

[0142] Determine the outdoor temperature interval and the saturated temperature interval corresponding to the target saturated evaporation temperature, where there are multiple saturated temperature intervals;

[0143] Determining a target saturation temperature interval corresponding to the refrigerant temperature in a plurality of saturation temperature intervals;

[0144] The opening of the electronic expansion valve is adjusted according to the target opening corresponding to the target saturation temperature range.

[0145] Optionally, the target opening includes a first opening and a third opening. When the processor 501 adjusts the opening of the electronic expansion valve according to the target opening corresponding to the target saturation temperature range, the processor 501 specifically performs:

[0146] If the target saturation temperature interval is the first saturation temperature interval, adjusting the opening of the electronic expansion valve according to the first opening corresponding to the first saturation temperature interval;

[0147] If the target saturation temperature interval is the second saturation temperature interval, determining a third opening corresponding to the second saturation temperature interval based on the number of adjustments of the electronic expansion valve and the second opening corresponding to the second saturation temperature interval, and adjusting the opening of the electronic expansion valve according to the third opening;

[0148] Update the adjustment times of the electronic expansion valve.

[0149] Optionally, when updating the adjustment times of the electronic expansion valve, the processor 501 specifically performs:

[0150] If the target saturation temperature interval is the first saturation temperature interval, the adjustment times of the electronic expansion valve are updated to the initial value;

[0151] If the target saturation temperature interval is the second saturation temperature interval, the adjustment times of the electronic expansion valve are updated according to the preset value.

[0152] Optionally, after determining the target saturation temperature interval corresponding to the refrigerant temperature in the multiple saturation temperature intervals, the processor 501 further executes:

[0153] If the target saturation temperature interval corresponding to the refrigerant temperature does not exist in the saturation temperature interval, the air source water heater is controlled to exit the oil blockage prevention mode.

[0154] Optionally, when the processor 501 controls the air source water heater to enter the oil blockage prevention mode based on the outdoor ambient temperature, the processor 501 specifically performs:

[0155] When the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the air source water heater is controlled to enter the oil blockage prevention mode; or,

[0156] When the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, and the refrigerant temperature is less than or equal to the refrigerant temperature threshold, the air source water heater is controlled to enter the oil blockage prevention mode.

[0157] Optionally, a pressure sensor is further installed at the refrigerant outlet of the outdoor heat exchanger. When the processor 501 determines the target saturated evaporation temperature of the refrigerant of the outdoor heat exchanger, it specifically executes:

[0158] Obtain the pressure value of the refrigerant flowing out of the outdoor heat exchanger collected by the pressure sensor;

[0159] Determine a saturated evaporation temperature corresponding to the pressure value, and determine a target saturated evaporation temperature based on the saturated evaporation temperature, where there are multiple saturated evaporation temperatures;

[0160] The target saturated evaporation temperature is determined based on a mapping relationship between the outdoor ambient temperature and the target saturated evaporation temperature.

[0161] Optionally, when the processor 501 determines the target saturated evaporation temperature based on the saturated evaporation temperature, the processor 501 specifically performs:

[0162] The average value of the saturated evaporation temperature is determined as the target saturated evaporation temperature.

[0163] See also Figure 8 , is a schematic diagram of the structure of an air source water heater provided in the embodiment of the present application. Figure 8 As shown, the air source water heater 500 includes: a processor 501, a memory 502, a display screen 503, a camera component 504, an audio circuit 505, a sensor 506 and a power supply 507. The processor 501 is electrically connected to the display 503, the camera component 504, the audio circuit 505, the sensor 506 and the power supply 507 respectively.

[0164] The display screen 503 may be used to display information input by a user or information provided to a user and various graphical user interfaces of the air source water heater 500 , which may be composed of images, texts, icons, videos and any combination thereof.

[0165] The camera assembly 504 may include an image processing circuit, which may be implemented using hardware and / or software components and may include various processing units that define an image signal processing pipeline. The image processing circuit may include at least: multiple cameras, an image signal processor (ISP processor), a control logic, and an image memory, etc. Each camera may include at least one or more lenses and an image sensor. The image sensor may include a color filter array (such as a Bayer filter). The image sensor may obtain light intensity and wavelength information captured by each imaging pixel of the image sensor, and provide a set of raw image data that can be processed by an image signal processor.

[0166] The audio circuit 505 can be used to provide an audio interface between the user and the air source water heater 500 through a speaker and a microphone. The audio circuit 505 includes a microphone. The microphone is electrically connected to the processor 501. The microphone is used to receive voice information input by the user.

[0167] The sensor 506 is used to collect information about the air source water heater 500 itself, the user's information, or the external environment information. For example, the sensor 506 may include one or more sensors such as a vibration sensor, a temperature sensor, a distance sensor, a magnetic field sensor, a light sensor, an acceleration sensor, a fingerprint sensor, a Hall sensor, a position sensor, a gyroscope, an inertial sensor, a posture sensor, a barometer, and a heart rate sensor.

[0168] The power supply 507 is used to supply power to various components of the air source water heater 500. In some embodiments, the power supply 507 can be logically connected to the processor 501 through a power management system, so as to manage charging, discharging, and power consumption through the power management system.

[0169] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the above-mentioned related steps to implement a control method for an electronic expansion valve provided in the above embodiment.

[0170] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0171] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0172] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0173] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control method for an electronic expansion valve, characterized in that: Applied to an air source water heater, the air source water heater includes an outdoor heat exchanger, the outdoor heat exchanger is equipped with a temperature sensor, and a pressure sensor is also installed at the refrigerant outlet of the outdoor heat exchanger. The method includes: Acquiring the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor; Controlling the air source water heater to enter an oil blockage prevention mode based on the outdoor ambient temperature; In the oil blockage prevention mode, obtaining a pressure value of the refrigerant flowing out of the outdoor heat exchanger collected by the pressure sensor; Determine a saturated evaporation temperature corresponding to the pressure value, and determine a target saturated evaporation temperature based on the saturated evaporation temperature, wherein there are multiple saturated evaporation temperatures, and the target saturated evaporation temperature is the temperature required for the refrigerant to change from liquid to gas in the outdoor heat exchanger; The opening degree of the electronic expansion valve is adjusted based on the refrigerant temperature, the outdoor ambient temperature, and the target saturated evaporation temperature.

2. The method according to claim 1, characterized in that The adjusting the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor environment temperature and the target saturated evaporation temperature includes: Determining the outdoor temperature range in which the outdoor ambient temperature lies; Determine a saturated temperature interval corresponding to the outdoor temperature interval and the target saturated evaporation temperature, wherein there are multiple saturated temperature intervals; Determining a target saturation temperature interval corresponding to the refrigerant temperature among the plurality of saturation temperature intervals; The opening of the electronic expansion valve is adjusted according to the target opening corresponding to the target saturation temperature range.

3. The method according to claim 2, characterized in that The target opening includes a first opening and a third opening, and adjusting the opening of the electronic expansion valve according to the target opening corresponding to the target saturation temperature range includes: If the target saturation temperature interval is a first saturation temperature interval, adjusting the opening of the electronic expansion valve according to a first opening corresponding to the first saturation temperature interval; If the target saturation temperature interval is the second saturation temperature interval, determining a third opening corresponding to the second saturation temperature interval based on the number of adjustments of the electronic expansion valve and the second opening corresponding to the second saturation temperature interval, and adjusting the opening of the electronic expansion valve according to the third opening; The adjustment times of the electronic expansion valve are updated.

4. The method according to claim 3, characterized in that The updating of the adjustment times of the electronic expansion valve includes: If the target saturation temperature interval is the first saturation temperature interval, updating the adjustment times of the electronic expansion valve to an initial value; If the target saturation temperature interval is the second saturation temperature interval, the adjustment times of the electronic expansion valve are updated according to a preset value.

5. The method according to claim 3, characterized in that: After determining the target saturation temperature interval corresponding to the refrigerant temperature in the plurality of saturation temperature intervals, the method further includes: If the target saturation temperature interval corresponding to the refrigerant temperature does not exist in the saturation temperature interval, the air source water heater is controlled to exit the oil blockage prevention mode.

6. The method according to claim 1, characterized in that The controlling the air source water heater to enter the oil blockage prevention mode based on the outdoor ambient temperature includes: If the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the air source water heater is controlled to enter an oil blockage prevention mode; or, If the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, and the refrigerant temperature is less than or equal to the refrigerant temperature threshold, the air source water heater is controlled to enter an oil blockage prevention mode.

7. The method according to claim 6, characterized in that The determining the target saturated evaporation temperature based on the saturated evaporation temperature includes: An average value of the saturated evaporation temperatures is determined as the target saturated evaporation temperature.

8. A control device for an electronic expansion valve, characterized in that: The device comprises: An acquisition unit, used to acquire the outdoor ambient temperature and the refrigerant temperature of the outdoor heat exchanger collected by the temperature sensor; A control unit, used for controlling the air source water heater to enter an oil blockage prevention mode based on the outdoor ambient temperature; A fourth determination subunit is used to obtain, in the oil blockage prevention mode, a pressure value of the refrigerant flowing out of the outdoor heat exchanger collected by the pressure sensor; a fifth determination subunit, configured to determine a saturated evaporation temperature corresponding to the pressure value, and determine a target saturated evaporation temperature based on the saturated evaporation temperature, wherein there are multiple saturated evaporation temperatures, and the target saturated evaporation temperature is a temperature required for the refrigerant to change from a liquid state to a gas state in the outdoor heat exchanger; An adjustment unit is used to adjust the opening of the electronic expansion valve based on the refrigerant temperature, the outdoor environment temperature and the target saturated evaporation temperature.

9. An air source water heater, characterized in that: The water heater comprises: A memory for storing executable program codes; A processor is used to call and run the executable program code from the memory so that the air source water heater executes the method according to any one of claims 1 to 7.

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

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