Electronic expansion valve control method and device for water machine air conditioner and air conditioner

Abstract

The application provides an electronic expansion valve control method and device of a water machine air conditioner and the air conditioner. The electronic expansion valve control method of the water machine air conditioner comprises the following steps: obtaining suction superheat of the water machine air conditioner; comparing the suction superheat with a first temperature threshold to obtain a first comparison result; judging whether it is necessary to enter a target control process according to the first comparison result; if yes, obtaining a discharge temperature and a water outlet temperature, and controlling the opening degree of the electronic expansion valve according to the discharge temperature and the water outlet temperature. The electronic expansion valve can be controlled more comprehensively and accurately.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and in particular, relates to an electronic expansion valve control method and device of a water machine air conditioner and the air conditioner. BACKGROUND

[0002] In the present air conditioner, there is a water machine air conditioner, which specifically comprises a compressor, a four-way valve, a condenser, an electronic expansion valve, a plate heat exchanger, a water pump, an outer ring temperature sensor, a return air temperature sensor, an exhaust air temperature sensor, a return water temperature sensor, an outlet water temperature sensor, and a coil temperature sensor; during heating, the refrigerant is discharged from the compressor to the four-way valve D pipe, the four-way valve C pipe, the plate heat exchanger inlet pipe, the plate heat exchanger outlet pipe, the electronic expansion valve, the condenser, the four-way valve E pipe, the four-way valve S pipe, and the compressor return air. The refrigerant in the plate heat exchanger inlet pipe is high-temperature and high-pressure gaseous refrigerant, which heats the water in the plate heat exchanger to produce hot water.

[0003] The heating capacity of the air conditioner is controlled by controlling the opening degree of the electronic expansion valve. In the existing control method, the opening degree of the electronic expansion valve is adjusted by detecting and calculating the suction superheat. However, the single suction superheat judgment is not accurate enough, and many factors in the actual water machine air conditioner also affect the heating capacity of the air conditioner. The existing adjustment method is not complete and comprehensive. SUMMARY

[0004] Therefore, the present application provides an electronic expansion valve control method and device of a water machine air conditioner and an air conditioner, which can more comprehensively and accurately control the electronic expansion valve.

[0005] To solve the above problems, the present application provides an electronic expansion valve control method of a water machine air conditioner, which comprises the following steps: obtaining the suction superheat of the water machine air conditioner; comparing the suction superheat with a first temperature threshold to obtain a first comparison result; judging whether it is necessary to enter a target control process according to the first comparison result; if not, controlling the opening degree of the electronic expansion valve according to the first comparison result; and if yes, obtaining the exhaust air temperature and the outlet water temperature, and controlling the opening degree of the electronic expansion valve according to the exhaust air temperature and the outlet water temperature.

[0006] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the suction superheat degree of the water machine air conditioner is acquired first to compare with the first temperature threshold, one-time judgment control is performed, the system state of the current water machine air conditioner is preliminarily determined, whether secondary judgment needs to be performed is judged, and the control of the opening degree of the electronic expansion valve is determined, so that the control of the opening degree of the electronic expansion valve is more accurate and comprehensive, the opening degree of the electronic expansion valve can better adapt to the internal environment of the current water machine air conditioner, the judgment basis is more comprehensive, the control of the electronic expansion valve is more accurate, the corresponding functions can be better completed, the heating function of the air conditioner is better, the operation capacity and energy efficiency of the unit are better, and the operation cost is reduced.

[0007] In an example of the present application, according to the first comparison result, it is judged whether it is necessary to enter the target control process, and further comprising: if not, controlling the opening degree of the electronic expansion valve according to the first comparison result.

[0008] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the opening degree of the electronic expansion valve is directly controlled according to the first comparison result, so that the control of the electronic expansion valve of the current water machine air conditioner is more rapid, the control efficiency is improved, and the heating effect of the water machine air conditioner is improved.

[0009] In an example of the present application, the opening degree of the electronic expansion valve is controlled according to the first comparison result, including: when the first comparison result is that the suction superheat degree is greater than the first temperature threshold, the opening degree of the electronic expansion valve is controlled to increase; and / or when the first comparison result is that the suction superheat degree is less than the first temperature threshold, the opening degree of the electronic expansion valve is controlled to decrease.

[0010] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: when the suction superheat degree is greater than the first temperature threshold, the opening degree of the electronic expansion valve is controlled to increase, the exhaust temperature and the exhaust pressure are reduced, the current water machine air conditioner can run better, the normal operation of the air conditioner is ensured, and when the suction superheat degree is less than the first temperature threshold, the opening degree of the electronic expansion valve is controlled to decrease, the exhaust temperature is increased, the working capacity of the current water machine air conditioner is improved, the energy consumption of the current air conditioner is reduced, the normal operation of the air conditioner is ensured, and the user experience is better.

[0011] In an example of the present application, the opening degree of the electronic expansion valve is controlled according to the exhaust temperature and the water outlet temperature, including: when the first comparison result is that the suction superheat degree is equal to the first temperature threshold, the exhaust temperature and the water outlet temperature are subtracted to obtain a first difference value; and the opening degree of the electronic expansion valve is controlled according to the first difference value.

[0012] Compared with the prior art, the technical effects reached by adopting the technical scheme are: by setting that when the suction superheat degree is equal to the first temperature threshold, a first difference value is obtained by subtracting the exhaust temperature from the outlet water temperature, and the opening degree of the electronic expansion valve is controlled according to the first difference value, the opening degree of the electronic expansion valve is more fitted to the actual situation of the water machine air conditioner, and since the heating capacity of the current air conditioner is greatly related to the difference value of the exhaust temperature and the outlet water temperature, the electronic expansion valve is controlled by detecting the difference value of the two, so that the whole judgment and control process is more comprehensive and accurate, and the normal operation of the air conditioner is ensured.

[0013] In an example of the present application, before controlling the opening degree of the electronic expansion valve according to the first difference value, the water return temperature of the water machine air conditioner is detected, and the opening degree of the electronic expansion valve is controlled according to the water return temperature.

[0014] Compared with the prior art, the technical effects reached by adopting the technical scheme are: by detecting the water return temperature and controlling the opening degree of the electronic expansion valve according to the water return temperature, since the conditions in the water machine air conditioner are different under different water temperature environments, the water temperature environment condition is added as a condition for controlling the opening degree of the electronic expansion valve, so that the control condition of the opening degree of the electronic expansion valve is more comprehensive and more suitable for the current situation in the water machine air conditioner, so that the electronic expansion valve can work better, and thus the operation of the air conditioner is more stable.

[0015] In an example of the present application, controlling the opening degree of the electronic expansion valve according to the water return temperature further includes: when the water return temperature is less than or equal to a second temperature threshold, entering a low water temperature control mode; and / or when the water return temperature is greater than the second temperature threshold, entering a high water temperature control mode.

[0016] Compared with the prior art, the technical effects reached by adopting the technical scheme are: by setting that when the water return temperature is less than or equal to a second temperature threshold, entering a low water temperature control mode; and when the water return temperature is greater than the second temperature threshold, entering a high water temperature control mode, different controls are performed in the low temperature and high temperature two temperature ranges, so that the control of the electronic expansion valve is more accurate and comprehensive, the electronic expansion valve can better adapt to the current environment of the water machine air conditioner, and the normal operation of the air conditioner is better ensured.

[0017] In an example of the present application, when the return water temperature is less than or equal to the second temperature threshold, the low water temperature control mode is entered, and the specific control of the low water temperature control mode includes: obtaining the exhaust temperature and the outlet water temperature of the current water machine air conditioner, and obtaining a second difference value by subtracting the exhaust temperature from the outlet water temperature, and judging the size of the second difference value and the third temperature threshold; when the second difference value is less than the third temperature threshold, the opening of the electronic expansion valve is controlled to decrease until the second difference value is equal to the third temperature threshold; and / or when the second difference value is greater than the third temperature threshold, the opening of the electronic expansion valve is controlled to increase until the second difference value is equal to the third temperature threshold; and / or when the second difference value is equal to the third temperature threshold, the opening of the electronic expansion valve is kept unchanged.

[0018] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: by obtaining the exhaust temperature and the outlet water temperature of the current water machine air conditioner, and obtaining a second difference value by subtracting the exhaust temperature from the outlet water temperature, and according to the relationship between the second difference value and the third temperature threshold, the opening of the electronic expansion valve is controlled differently, so that the electronic expansion valve can make different opening control according to different temperature differences, so as to ensure that the current opening of the electronic expansion valve is most suitable for the environment of the current water machine air conditioner, and at the same time, through the opening control of the electronic expansion valve, the exhaust temperature in the current water machine air conditioner reaches a suitable value, reduces the energy consumption of the water machine air conditioner, and at the same time, makes the operation of the entire water machine air conditioner more stable, ensures the normal operation of the air conditioner, and at the same time, the change of the opening of the electronic expansion valve is set until the second difference value is equal to the third temperature threshold, so that the difference between the exhaust temperature and the water temperature is kept stable through the opening control of the electronic expansion valve, so that the entire water machine air conditioner is also kept stable, and the heating of the air conditioner is more stable.

[0019] In an example of the present application, when the return water temperature is greater than the second temperature threshold, the high water temperature control mode is entered, and the specific control of the high water temperature control mode includes: obtaining the exhaust temperature and the outlet water temperature of the current water machine air conditioner, and obtaining a third difference value by subtracting the exhaust temperature from the outlet water temperature, and judging the size of the third difference value and the fourth temperature threshold; when the third difference value is less than the fourth temperature threshold, the opening of the electronic expansion valve is controlled to decrease until the third difference value is equal to the fourth temperature threshold; and / or when the third difference value is greater than the fourth temperature threshold, the opening of the electronic expansion valve is controlled to increase until the third difference value is equal to the fourth temperature threshold; and / or when the third difference value is equal to the fourth temperature threshold, the opening of the electronic expansion valve is kept unchanged.

[0020] Compared with existing technologies, the technical effects achieved by this solution are as follows: By acquiring the exhaust temperature and outlet water temperature of the current water-cooled air conditioner and calculating the difference, a third difference value is obtained. Based on the relationship between this third difference value and a fourth temperature threshold, the opening degree of the electronic expansion valve is controlled differently. This allows the electronic expansion valve to adjust its opening degree according to different temperature differences, ensuring that the current opening degree of the electronic expansion valve is most suitable for the current environment of the water-cooled air conditioner. Simultaneously, by controlling the opening degree of the electronic expansion valve, the exhaust temperature inside the water-cooled air conditioner reaches a suitable value, reducing the energy consumption of the water-cooled air conditioner and making the operation of the entire water-cooled air conditioner more stable, ensuring its normal operation. Furthermore, the opening degree of the electronic expansion valve is set to change until the third difference value equals the fourth temperature threshold, ensuring that the difference between the exhaust temperature and the water temperature remains stable through the opening degree control of the electronic expansion valve, thus maintaining the stability of the entire water-cooled air conditioner and making the heating of the air conditioner more stable.

[0021] The present invention also provides an electronic expansion valve control device for a water-cooled air conditioner. The electronic expansion valve control device for the water-cooled air conditioner includes: an acquisition module for acquiring the suction superheat of the water-cooled air conditioner; a judgment control module for comparing the suction superheat with a first temperature threshold to obtain a first comparison result; determining whether to enter the target control process based on the first comparison result; if so, acquiring the exhaust temperature and the outlet water temperature, and controlling the opening degree of the electronic expansion valve based on the exhaust temperature and the outlet water temperature.

[0022] Compared with existing technologies, the technical effects achieved by this solution are as follows: The acquisition module obtains the intake superheat, making subsequent judgments more convenient. Simultaneously, the judgment and control module compares the intake superheat with a first temperature threshold to obtain a first comparison result. Then, based on the first comparison result, the exhaust temperature, and the outlet water temperature, the opening degree of the electronic expansion valve is controlled. This makes the conditions for controlling the opening degree of the electronic expansion valve more comprehensive and precise, ensuring that the current opening degree of the electronic expansion valve adapts to the current environment and guarantees the normal operation of the air conditioner.

[0023] The present invention also provides an air conditioner, which includes: a readable storage medium storing a computer program and a packaged IC. When the computer program is read and run by the packaged IC, the air conditioner performs the electronic expansion valve control method of the water-cooled air conditioner described above.

[0024] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0025] (1) By first obtaining the suction superheat of the water-cooled air conditioner and comparing it with the first temperature threshold, a judgment control is performed to initially determine the current system status of the water-cooled air conditioner, and then it is determined whether a second judgment is needed, and then the control of the opening of the electronic expansion valve is determined, so that the control of the opening of the electronic expansion valve is more accurate and comprehensive. At the same time, the opening of the electronic expansion valve is controlled by the exhaust temperature and the outlet water temperature, so that the opening of the electronic expansion valve can better adapt to the current internal environment of the water-cooled air conditioner. Through a more comprehensive judgment basis, the control of the electronic expansion valve is also more precise, so that it can better complete the corresponding functions, so that the heating function of the air conditioner is better, the unit's operating capacity and energy efficiency are better, and thus the operating cost is reduced.

[0026] (2) By detecting the return water temperature and controlling the opening of the electronic expansion valve according to the return water temperature, since the conditions inside the water-cooled air conditioner are different under different water temperature environments, the conditions of the water temperature environment are added as the conditions for controlling the opening of the electronic expansion valve, so that the control conditions of the opening of the electronic expansion valve are more comprehensive and more suitable for the current internal conditions of the water-cooled air conditioner, so that the electronic expansion valve can work better, and thus the operation of the air conditioner is more stable.

[0027] (3) By setting the suction superheat to equal the first temperature threshold, the first difference is obtained by taking the difference between the exhaust temperature and the outlet water temperature; the opening of the electronic expansion valve is controlled according to the first difference, so that the opening of the electronic expansion valve is more in line with the actual situation of the current water-cooled air conditioner. Since the heating capacity of the current air conditioner is closely related to the difference between the exhaust temperature and the outlet water temperature, the electronic expansion valve is controlled by detecting the difference between the two, so that the whole judgment and control process is more comprehensive and accurate, and the normal operation of the air conditioner is guaranteed. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A flowchart of an electronic expansion valve control method for a water-cooled air conditioner provided in an embodiment of the present invention.

[0030] Figure 2 A detailed flowchart of an electronic expansion valve control method for a water-cooled air conditioner provided in an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure of a water-cooled air conditioner provided in an embodiment of the present invention.

[0032] Figure 4 A schematic block diagram of the electronic expansion valve control device for a water-cooled air conditioner provided in an embodiment of the present invention.

[0033] Figure 5 This is a block diagram of an air conditioner provided in an embodiment of the present invention.

[0034] Figure 6 A schematic diagram of the structure of a readable storage medium provided in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100 is the electronic expansion valve control device for the water-cooled air conditioner; 110 is the acquisition module; 120 is the judgment control module; 200 is the air conditioner; 210 is the packaged IC; 220 is the computer program; 300 is the readable storage medium; 310 is the computer-executable instruction. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] [First Embodiment]

[0039] See Figures 1-6 This invention provides a method for controlling the electronic expansion valve of a water-cooled air conditioner. The method includes:

[0040] Step S100: Obtain the suction superheat of the water-cooled air conditioner;

[0041] Step S200: Compare the intake superheat with the first temperature threshold to obtain the first comparison result; based on the first comparison result, determine whether it is necessary to enter the target control process; if so, obtain the exhaust temperature and the outlet water temperature, and control the opening of the electronic expansion valve based on the exhaust temperature and the outlet water temperature.

[0042] Specifically, existing water-cooled air conditioners include: a compressor, a four-way valve, a condenser, an electronic expansion valve, a heat exchanger, a water pump, an outer loop temperature sensor, a return gas temperature sensor, an exhaust temperature sensor, a return water temperature sensor, an outlet water temperature sensor, and a coil temperature sensor. During heating, the refrigerant flows from the compressor exhaust → four-way valve D pipe → four-way valve C pipe → heat exchanger inlet pipe → heat exchanger outlet pipe → electronic expansion valve → condenser → four-way valve E pipe → four-way valve S pipe → compressor return gas. The refrigerant in the heat exchanger inlet pipe is a high-temperature, high-pressure gaseous refrigerant, which heats the water in the heat exchanger to produce hot water.

[0043] Specifically, when the heat pump is turned on for heating, the return gas temperature is detected and recorded as T. 回气 The coil temperature is denoted as T. 盘管 The return water temperature is denoted as T. 回水 The outlet water temperature is denoted as T. 出水 The outer ring temperature is denoted as T. 外环 After the water pump is running normally, the compressor starts operating, and the suction superheat (T) is calculated. 回气 -T 盘管 The electronic expansion valve is compared with the target intake superheat, i.e., the first temperature threshold T2~T3. The target intake superheat is a preset value that can be manually adjusted. For example, T2 can be -5℃ and T3 can be 5℃. When the intake superheat is detected to be > T3, the electronic expansion valve is opened; when the intake superheat is < T2, the electronic expansion valve is closed.

[0044] Furthermore, when the superheat is within the range of T2 to T3, the exhaust temperature is recorded as T. 排气 The current real-time outlet water temperature is denoted as T. 出水 .

[0045] Calculate the electronic expansion valve T 排气 With T 出水 The difference, or first difference, divides the water temperature into two zones, keeping the temperature difference within the specified range:

[0046] According to the detection T 回水 If the water temperature falls within the low / high range, the following control measures will be applied:

[0047] Low water temperature range: T 回水 ≤T4 (15~30℃), where T4 is the second temperature threshold, a preset value. For example, T4 can be set to (15~30℃). △T1 is the second difference, i.e., the current electronic expansion valve T... 排气 With T 出水 The difference is denoted as the temperature range of the third temperature threshold (10~15℃), and T5=10℃, T6=15℃.

[0048] When ΔT1 < T5, the exhaust temperature is too low, the heat exchange temperature difference between the refrigerant and water in the heat exchanger is small, and the capacity is low. Closing the electronic expansion valve increases the exhaust temperature and the heat exchange temperature difference between the refrigerant and water in the heat exchanger, thereby increasing the capacity. When ΔT1 > T6, the exhaust temperature is too high, and further increasing the exhaust temperature will not significantly improve the capacity. Moreover, at this time, the exhaust temperature and exhaust pressure are high, and the compressor energy consumption is high. By opening the electronic expansion valve, the exhaust temperature and exhaust pressure are reduced, thereby reducing the compressor energy consumption without affecting the unit's capacity.

[0049] When T5 < ΔT1 < T6, the electronic expansion valve remains unchanged.

[0050] High water temperature range: T 回水 >T4, △T2 is the third difference, that is, the current electronic expansion valve T 排气 With T 出水 The difference is denoted as the temperature range of the fourth temperature threshold (30~35℃), and T7=30℃, T8=35℃.

[0051] When ΔT2 < T7, the exhaust temperature is too low, the heat exchange temperature difference between the refrigerant and water in the plate heat exchanger is small, and the capacity is low. Closing the electronic expansion valve increases the exhaust temperature and the heat exchange temperature difference between the refrigerant and water in the plate heat exchanger, thereby increasing the capacity. When ΔT2 > T8, the exhaust temperature is too high, and further increasing the exhaust temperature has little effect on improving the capacity. Moreover, at this time, the exhaust temperature and exhaust pressure are high, and the compressor energy consumption is high. By opening the electronic expansion valve, the exhaust temperature and exhaust pressure are reduced, thereby reducing the compressor energy consumption without affecting the unit's capacity.

[0052] When T7 < ΔT2 < T8, the electronic expansion valve remains unchanged.

[0053] The valve cycle operation is as follows:

[0054] When △T1>T6, open the electronic expansion valve, such as increasing △P every △t time step, △t (10~40S), △P (2~10PLS), until △T1≤T6. The same applies when △T2<T7.

[0055] When △T1 < T5, the electronic expansion valve is closed, such as by closing △P every △t time step, △t (10~40S), △P (2~10PLS), until △T1 ≥ T5. The same applies when △T2 > T8.

[0056] Preferably, the suction superheat of the water-cooled air conditioner is first obtained and compared with a first temperature threshold to perform an initial judgment and control, preliminarily determining the current system status of the water-cooled air conditioner. This then determines whether a second judgment is needed, and subsequently determines the control of the electronic expansion valve opening. This makes the control of the electronic expansion valve opening more accurate and comprehensive. Simultaneously, the opening of the electronic expansion valve is controlled based on the exhaust temperature and outlet water temperature, allowing the electronic expansion valve opening to better adapt to the current internal environment of the water-cooled air conditioner. Through more comprehensive judgment criteria, the control of the electronic expansion valve becomes more precise, enabling it to better perform its corresponding functions, resulting in better heating performance, improved unit operating capacity and energy efficiency, and ultimately reduced operating costs.

[0057] Specifically, if not, the opening degree of the electronic expansion valve is controlled according to the first comparison result, which also includes: when the intake superheat is greater than the first temperature threshold, the opening degree of the electronic expansion valve is increased; when the intake superheat is less than the first temperature threshold, the opening degree of the electronic expansion valve is decreased.

[0058] Preferably, when the intake superheat is detected to be greater than the first temperature threshold, the opening of the electronic expansion valve is increased to reduce the exhaust temperature and exhaust pressure, thereby enabling the current water-cooled air conditioner to operate better and ensuring its normal operation. At the same time, when the intake superheat is less than the first temperature threshold, the opening of the electronic expansion valve is reduced to increase the exhaust temperature, thereby improving the working capacity of the current water-cooled air conditioner, reducing its energy consumption, and ensuring its normal operation, thus providing a better user experience.

[0059] Specifically, if so, the exhaust temperature and outlet water temperature are obtained, and the opening degree of the electronic expansion valve is controlled according to the exhaust temperature and outlet water temperature. It also includes: when the intake superheat is equal to the first temperature threshold, the exhaust temperature and outlet water temperature are obtained, and the difference between the exhaust temperature and outlet water temperature is calculated to obtain the first difference value; the opening degree of the electronic expansion valve is controlled according to the first difference value.

[0060] Preferably, by setting the suction superheat to equal the first temperature threshold, the first difference is obtained by subtracting the exhaust temperature and the outlet water temperature; the opening of the electronic expansion valve is controlled based on the first difference, so that the opening of the electronic expansion valve is more in line with the actual situation of the current water-cooled air conditioner. Since the heating capacity of the current air conditioner is closely related to the difference between the exhaust temperature and the outlet water temperature, controlling the electronic expansion valve by detecting the difference between the two makes the entire judgment and control process more comprehensive and accurate, ensuring the normal operation of the air conditioner.

[0061] Specifically, before controlling the opening of the electronic expansion valve based on the first difference, the process also includes: detecting the return water temperature of the water heater / air conditioner; and controlling the opening of the electronic expansion valve based on the return water temperature.

[0062] Preferably, the opening of the electronic expansion valve is controlled by detecting the return water temperature. Since the conditions inside the water-cooled air conditioner are different under different water temperature environments, the water temperature environment is included as a condition for controlling the opening of the electronic expansion valve. This makes the control conditions of the electronic expansion valve opening more comprehensive and more suitable for the current internal conditions of the water-cooled air conditioner, enabling the electronic expansion valve to work better and thus making the operation of the air conditioner more stable.

[0063] Specifically, the opening of the electronic expansion valve is controlled according to the return water temperature, including: when the return water temperature is less than or equal to the second temperature threshold, it enters the low water temperature control mode; when the return water temperature is greater than the second temperature threshold, it enters the high water temperature control mode.

[0064] Preferably, by setting the return water temperature to be less than or equal to the second temperature threshold, the system enters a low water temperature control mode; when the return water temperature is greater than the second temperature threshold, it enters a high water temperature control mode. By using different control methods for the two temperature ranges of low and high temperature, the electronic expansion valve can be controlled more accurately and comprehensively, ensuring that the electronic expansion valve can better adapt to the current environment of the water-cooled air conditioner and better guarantee the normal operation of the air conditioner.

[0065] Specifically, when the return water temperature is less than or equal to the second temperature threshold, entering the low water temperature control mode also includes: obtaining the current exhaust temperature and outlet water temperature of the water heater air conditioner, calculating the difference to obtain a second difference value, and determining the magnitude of the second difference value and the third temperature threshold; when the second difference value is less than the third temperature threshold, controlling the opening of the electronic expansion valve to decrease until the second difference value equals the third temperature threshold; when the second difference value is greater than the third temperature threshold, controlling the opening of the electronic expansion valve to increase until the second difference value equals the third temperature threshold; when the second difference value equals the third temperature threshold, keeping the opening of the electronic expansion valve unchanged.

[0066] Preferably, by acquiring the current exhaust temperature and outlet water temperature of the water-cooled air conditioner and calculating the difference to obtain a second difference value, the opening degree of the electronic expansion valve is controlled differently based on the relationship between the second difference value and a third temperature threshold. This allows the electronic expansion valve to adjust its opening degree according to different temperature differences, ensuring that the current opening degree of the electronic expansion valve is most suitable for the current environment of the water-cooled air conditioner. At the same time, by controlling the opening degree of the electronic expansion valve, the exhaust temperature inside the water-cooled air conditioner reaches a suitable value, reducing the energy consumption of the water-cooled air conditioner and making the operation of the entire water-cooled air conditioner more stable, ensuring the normal operation of the air conditioner. Furthermore, the opening degree of the electronic expansion valve is set to change until the second difference value equals the third temperature threshold, so that the difference between the exhaust temperature and the water temperature remains stable through the opening degree control of the electronic expansion valve, keeping the entire water-cooled air conditioner stable and making the heating of the air conditioner more stable.

[0067] Specifically, when the return water temperature is greater than the second temperature threshold, the system enters a high water temperature control mode. This mode also includes: acquiring the current exhaust temperature and outlet water temperature of the water-cooled air conditioner, calculating the difference to obtain a third difference value, and determining the magnitude of the third difference value compared to the fourth temperature threshold. When the third difference value is less than the fourth temperature threshold, the opening of the electronic expansion valve is reduced until the third difference value equals the fourth temperature threshold. When the third difference value is greater than the fourth temperature threshold, the opening of the electronic expansion valve is increased until the third difference value equals the fourth temperature threshold. When the third difference value equals the fourth temperature threshold, the opening of the electronic expansion valve remains unchanged.

[0068] Preferably, by acquiring the current exhaust temperature and outlet water temperature of the water-cooled air conditioner and calculating the difference to obtain a third difference value, the opening degree of the electronic expansion valve is controlled differently based on the relationship between the third difference value and a fourth temperature threshold. This allows the electronic expansion valve to adjust its opening degree according to different temperature differences, ensuring that the current opening degree of the electronic expansion valve is most suitable for the current environment of the water-cooled air conditioner. At the same time, by controlling the opening degree of the electronic expansion valve, the exhaust temperature inside the water-cooled air conditioner reaches a suitable value, reducing the energy consumption of the water-cooled air conditioner and making the operation of the entire water-cooled air conditioner more stable, ensuring the normal operation of the air conditioner. Furthermore, the opening degree of the electronic expansion valve is set to change until the third difference value equals the fourth temperature threshold, so that the difference between the exhaust temperature and the water temperature remains stable through the opening degree control of the electronic expansion valve, keeping the entire water-cooled air conditioner stable and making the heating of the air conditioner more stable.

[0069] Specifically, the control method also includes: the opening degree of the electronic expansion valve is changed by changing the unit pressure value per unit time.

[0070] Preferably, by setting the opening of the electronic expansion valve to increase by a unit pressure value per unit time, the opening change of the electronic expansion valve is made more stable, ensuring that the air conditioner can operate stably when the opening of the electronic expansion valve changes, and preventing air conditioner malfunctions caused by the opening of the electronic expansion valve changing too quickly.

[0071] The present invention also provides an electronic expansion valve control device 100 for a water-cooled air conditioner. The electronic expansion valve control device 100 for the water-cooled air conditioner includes: an acquisition module 110 for acquiring the suction superheat of the water-cooled air conditioner; a judgment control module 120 for comparing the suction superheat with a first temperature threshold to obtain a first comparison result; determining whether to enter the target control process based on the first comparison result; if so, acquiring the exhaust temperature and the outlet water temperature, and controlling the opening degree of the electronic expansion valve based on the exhaust temperature and the outlet water temperature.

[0072] Preferably, the suction superheat is obtained by the acquisition module 110, which makes subsequent judgment more convenient. At the same time, the judgment control module 120 compares the suction superheat with the first temperature threshold to obtain the first comparison result. Then, the opening degree of the electronic expansion valve is controlled according to the first comparison result, the exhaust temperature and the outlet water temperature. This makes the conditions for controlling the opening degree of the electronic expansion valve more comprehensive and the control of the opening degree of the electronic expansion valve more precise. It ensures that the opening degree of the electronic expansion valve is adapted to the current environment and ensures the normal operation of the air conditioner.

[0073] The present invention also provides an air conditioner 200, characterized in that the air conditioner 200 includes: a readable storage medium 300 storing a computer program 220 and a packaged IC 210, wherein when the computer program 220 is read and run by the packaged IC 210, the air conditioner executes the electronic expansion valve control method of the water-cooled air conditioner described above.

[0074] In this embodiment, the packaged IC 210 can be, for example, a processor chip electrically connected to the computer-readable storage medium 300 to read and execute the computer-executable instructions 310. The packaged IC 210 can also be a packaged circuit board encapsulating a processor chip capable of reading and executing the computer program 220; of course, the circuit board can also encapsulate the computer-readable storage medium 300.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0076] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium 300. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned readable storage medium 300 includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling an electronic expansion valve in a water-cooled air conditioner, characterized in that, The electronic expansion valve control method for the water-cooled air conditioner includes: Obtain the intake superheat of the water-cooled air conditioner; The intake superheat is compared with a first temperature threshold to obtain a first comparison result; Based on the first comparison result, determine whether it is necessary to enter the target control process; If so, when the first comparison result is that the intake superheat is equal to the first temperature threshold, the return water temperature of the water-cooled air conditioner is detected; when the return water temperature is less than or equal to the second temperature threshold, the low water temperature control mode is entered; when the return water temperature is greater than the second temperature threshold, the high water temperature control mode is entered. The specific control of the low water temperature control mode includes: acquiring the current exhaust temperature and outlet water temperature of the water-cooled air conditioner and calculating the difference to obtain a second difference value, and controlling the opening of the electronic expansion valve according to the magnitude of the second difference value and a third temperature threshold value; the specific control of the high water temperature control mode includes: acquiring the current exhaust temperature and outlet water temperature of the water-cooled air conditioner and calculating the difference to obtain a third difference value, and controlling the opening of the electronic expansion valve according to the magnitude of the third difference value and a fourth temperature threshold value.

2. The electronic expansion valve control method for a water-cooled air conditioner according to claim 1, characterized in that, The step of determining whether to enter the target control flow based on the first comparison result further includes: If not, the opening degree of the electronic expansion valve is controlled according to the first comparison result.

3. The electronic expansion valve control method for a water-cooled air conditioner according to claim 2, characterized in that, The step of controlling the opening degree of the electronic expansion valve based on the first comparison result includes: When the first comparison result indicates that the intake superheat is greater than the first temperature threshold, the opening of the electronic expansion valve is increased; and / or When the first comparison result indicates that the intake superheat is less than the first temperature threshold, the opening of the electronic expansion valve is reduced.

4. The electronic expansion valve control method for a water-cooled air conditioner according to claim 1, characterized in that, The step of controlling the opening degree of the electronic expansion valve based on the magnitude of the second difference and the third temperature threshold includes: When the second difference is less than the third temperature threshold, the opening of the electronic expansion valve is reduced until the second difference equals the third temperature threshold; and / or When the second difference is greater than the third temperature threshold, the opening of the electronic expansion valve is increased until the second difference equals the third temperature threshold; and / or When the second difference is equal to the third temperature threshold, the opening of the electronic expansion valve remains unchanged.

5. The electronic expansion valve control method for a water-cooled air conditioner according to claim 1, characterized in that, The step of controlling the opening degree of the electronic expansion valve based on the magnitude of the third difference and the fourth temperature threshold includes: When the third difference is less than the fourth temperature threshold, the opening of the electronic expansion valve is reduced until the third difference equals the fourth temperature threshold; and / or When the third difference is greater than the fourth temperature threshold, the opening of the electronic expansion valve is increased until the third difference equals the fourth temperature threshold; and / or When the third difference is equal to the fourth temperature threshold, the opening of the electronic expansion valve remains unchanged.

6. An electronic expansion valve control device for a water-cooled air conditioner, characterized in that, The electronic expansion valve control device of the water-cooled air conditioner includes: The acquisition module is used to acquire the suction superheat of the water-cooled air conditioner; The judgment control module is used to compare the intake superheat with a first temperature threshold to obtain a first comparison result; Based on the first comparison result, determine whether it is necessary to enter the target control process; If so, when the first comparison result is that the intake superheat is equal to the first temperature threshold, the return water temperature of the water-cooled air conditioner is detected; when the return water temperature is less than or equal to the second temperature threshold, the low water temperature control mode is entered; when the return water temperature is greater than the second temperature threshold, the high water temperature control mode is entered. The specific control of the low water temperature control mode includes: acquiring the current exhaust temperature and outlet water temperature of the water-cooled air conditioner and calculating the difference to obtain a second difference value, and controlling the opening of the electronic expansion valve according to the magnitude of the second difference value and a third temperature threshold value; the specific control of the high water temperature control mode includes: acquiring the current exhaust temperature and outlet water temperature of the water-cooled air conditioner and calculating the difference to obtain a third difference value, and controlling the opening of the electronic expansion valve according to the magnitude of the third difference value and a fourth temperature threshold value.

7. A water-cooled air conditioner, characterized in that, include: The water-cooled air conditioner includes a readable storage medium storing a computer program and a packaged IC, wherein the computer program is read and executed by the packaged IC, and the water-cooled air conditioner performs the electronic expansion valve control method for the water-cooled air conditioner as described in any one of claims 1 to 5.

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