Liquid level detection method and device, storage medium and cold water air conditioning unit

Abstract

The invention relates to the technical field of air conditioners, in particular to a liquid level detection method and device, a storage medium and a cold water air conditioning unit. The invention aims to solve the problem that the detected liquid level of the liquid level sensor deviates from the actual liquid level when the interface at the bottom of the liquid level sensor is inevitably positioned in the supercooling area due to structural limitation. In order to achieve the purpose, the liquid level detection method comprises the steps that first pressure inside a supercooling area and second pressure outside the supercooling area are obtained; according to the first pressure and the second pressure, the voltage difference corresponding to the liquid level difference between the interior of the supercooling area and the exterior of the supercooling area is calculated; acquiring detection voltage according to a liquid level sensor; calculating a corrected voltage according to the detection voltage and the voltage difference; and according to the corrected voltage, the actual liquid level is obtained. The deviation between the detected liquid level of the liquid level sensor and the actual liquid level can be corrected when the connector at the bottom of the liquid level sensor is located in the supercooling area, and the accuracy of liquid level control of the cold water air conditioning unit is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly relates to a liquid level detection method, device, storage medium, and chilled water air conditioner unit. Background Art

[0002] In the refrigeration equipment industry, the pursuit of high energy efficiency and low-cost manufacturing has always been the core goal. To achieve this goal, researchers and practitioners in the industry have continuously explored various methods to improve the energy efficiency of the unit. Among them, increasing the subcooling degree is an economical and efficient means. By setting a subcooling partition in the condenser to separate the subcooling area and arranging baffle plates in the subcooling area, the flow path of the refrigerant can be effectively extended, thereby increasing the subcooling degree of the refrigerant and improving the energy efficiency of the unit.

[0003] However, a relatively closed area is formed between the baffle plate and the subcooling partition of the condenser, and there is a certain pressure difference between the inside and the outside of the subcooling area. The two interfaces of the liquid level sensor of the chilled water air conditioner unit are respectively located in the middle and bottom of the condenser. When the interface at the bottom of the liquid level sensor is unavoidably located in the subcooling area due to structural limitations, it will cause the detected liquid level of the liquid level sensor to deviate from the actual liquid level, affecting the accuracy of the liquid level control of the chilled water air conditioner unit.

[0004] Correspondingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problem that when the interface at the bottom of the liquid level sensor is unavoidably located in the subcooling area due to structural limitations, it will cause the detected liquid level of the liquid level sensor to deviate from the actual liquid level, affecting the accuracy of the liquid level control of the chilled water air conditioner unit.

[0006] The present application provides a liquid level detection method applied to a chilled water air conditioner unit. The chilled water air conditioner unit includes a condenser housing, as well as a baffle plate, a subcooling partition, and a liquid level sensor disposed in the condenser housing. The subcooling partition separates a subcooling area in the condenser housing, and the baffle plate is located in the subcooling area. In the case where the lower interface of the liquid level sensor is located in the subcooling area, the liquid level detection method includes: obtaining a first pressure inside the subcooling area and a second pressure outside the subcooling area; calculating a voltage difference corresponding to the liquid level difference between the inside and the outside of the subcooling area according to the first pressure and the second pressure; obtaining a detected voltage according to the liquid level sensor; calculating a corrected voltage according to the detected voltage and the voltage difference; and obtaining the actual liquid level according to the corrected voltage.

[0007] In some embodiments, the step of "obtaining a voltage difference corresponding to the liquid level difference between the inside and the outside of the subcooled zone according to the first pressure and the second pressure" further includes: obtaining a liquid level difference according to the first pressure and the second pressure; and obtaining the voltage difference according to the liquid level difference and the voltage corresponding to the liquid level per unit length.

[0008] In some embodiments, the step of "obtaining a liquid level difference according to the first pressure and the second pressure" further includes: obtaining a pressure difference according to the first pressure and the second pressure; and obtaining the liquid level difference according to the pressure difference and the refrigerant density.

[0009] In some embodiments, the voltage corresponding to the liquid level per unit length is obtained according to the voltage range and the liquid level range of the liquid level sensor.

[0010] In some embodiments, the chilled water air conditioning unit is further provided with a first pressure sensor near the lower interface of the liquid level sensor; the first pressure is obtained through the first pressure sensor.

[0011] In some embodiments, the chilled water air conditioning unit is further provided with a second pressure sensor, and the second pressure sensor is arranged at the bottom of the condenser housing and outside the subcooled zone; the second pressure is obtained through the second pressure sensor.

[0012] In some embodiments, the step of "calculating a corrected voltage according to the detected voltage and the voltage difference" further includes: calculating the sum of the absolute value of the voltage difference and the detected voltage to obtain the corrected voltage.

[0013] The present application provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor can call and run the computer program to execute the above-mentioned liquid level detection method.

[0014] The present application provides a computer-readable storage medium, in which a computer program is stored, and wherein the computer program executes the above-mentioned liquid level detection method when running.

[0015] The present application provides a chilled water air conditioning unit, including a controller configured to be able to execute the above-mentioned liquid level detection method.

[0016] In the case of adopting the above technical solution, the present application calculates the voltage difference according to the first pressure inside the subcooling zone and the second pressure outside the subcooling zone, then calculates the corrected voltage according to the voltage difference and the detected voltage of the liquid level sensor, and obtains the actual liquid level according to the corrected voltage. The present application corrects the detected voltage of the liquid level sensor through the pressure inside and outside the subcooling zone, and can correct the deviation between the detected liquid level and the actual liquid level of the liquid level sensor when the interface at the bottom of the liquid level sensor is located in the subcooling zone, which is beneficial to improving the accuracy of the liquid level control of the chilled water air conditioner unit. Description of the Drawings

[0017] The present application will be described below with reference to the accompanying drawings. In the drawings:

[0018] Figure 1 is a schematic structural diagram of the condenser of the chilled water air conditioner unit provided by the present application;

[0019] Figure 2 is Figure 1 a schematic structural diagram of the condenser of the chilled water air conditioner unit shown in another perspective;

[0020] Figure 3 is a main step flow chart of the liquid level detection method provided by the present application;

[0021] Figure 4 is a detailed step flow chart of the liquid level detection method provided by the present application.

[0022] List of reference numerals

[0023] 1. Condenser housing; 2. Baffle; 3. Subcooling partition; 4. Liquid level sensor; 5. First pressure sensor; 6. Second pressure sensor. Detailed Embodiments

[0024] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not intended to limit the protection scope of the present application. It should be noted that although the detailed steps of the method of the present application are described in detail below, without departing from the basic principle of the present application, those skilled in the art can combine, split and change the order of the following steps, and the technical solutions modified in this way do not change the basic concept of the present application, so they also fall within the protection scope of the present application.

[0025] It should be noted that in the description of the present application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, "a plurality of" means at least two.

[0026] Combined with Figure 1As shown, the chilled water air-conditioning unit includes a condenser housing 1, and a baffle plate 2, a subcooling partition plate 3, and a liquid level sensor 4 disposed within the condenser housing 1. The subcooling partition plate 3 divides a subcooling zone within the condenser housing 1, and the baffle plate 2 is located within the subcooling zone. Among them, the baffle plates 2 are arranged in a staggered manner on two opposite surfaces within the subcooling zone to form an S-shaped refrigerant flow path around which the refrigerant flows, which can effectively extend the flow path of the refrigerant. The refrigerant exchanges heat with the heat exchange tubes within the subcooling zone, which can increase the subcooling degree of the refrigerant and improve the energy efficiency of the unit.

[0027] However, a relatively enclosed area is formed between the baffle plate 2 and the subcooling partition plate 3 of the condenser, and there is a certain pressure difference between the inside and the outside of the subcooling zone. The two interfaces of the liquid level sensor of the chilled water air-conditioning unit are respectively located in the middle and at the bottom of the condenser. When the interface at the bottom of the liquid level sensor is unavoidably located within the subcooling zone due to structural limitations, it will cause the detected liquid level of the liquid level sensor to deviate from the actual liquid level, affecting the accuracy of the liquid level control of the chilled water air-conditioning unit.

[0028] In some embodiments, in combination with Figure 1 and Figure 2 As shown, the chilled water air-conditioning unit is further provided with a first pressure sensor near the lower interface of the liquid level sensor. The chilled water air-conditioning unit is further provided with a second pressure sensor, and the second pressure sensor is disposed at the bottom of the condenser housing and is located outside the subcooling zone. The first pressure sensor is used to measure the pressure of the refrigerant within the subcooling zone, and the second pressure sensor is used to measure the pressure of the refrigerant outside the subcooling zone. In this way, it is convenient to correct the detection voltage of the liquid level sensor according to the pressures inside and outside the subcooling zone, and correct the deviation between the detected liquid level and the actual liquid level of the liquid level sensor when the interface at the bottom of the liquid level sensor is located within the subcooling zone, improving the accuracy of the liquid level control of the chilled water air-conditioning unit.

[0029] The present application provides a liquid level detection method, device, storage medium, and chilled water air-conditioning unit, which can correct the deviation between the detected liquid level and the actual liquid level of the liquid level sensor when the interface at the bottom of the liquid level sensor is located within the subcooling zone, and is beneficial to improving the accuracy of the liquid level control of the chilled water air-conditioning unit.

[0030] In a first aspect, the present application provides a liquid level detection method.

[0031] The liquid level detection method provided by the present application is applied to the above-mentioned chilled water air-conditioning unit. In combination with Figure 3 As shown, in the case where the lower interface of the liquid level sensor is located within the subcooling zone, the liquid level detection method includes the following steps:

[0032] S101, obtaining a first pressure inside the subcooling zone and a second pressure outside the subcooling zone.

[0033] The first pressure inside the subcooling zone can be obtained through a pressure sensor arranged inside the subcooling zone; the second pressure outside the subcooling zone can be obtained through a pressure sensor arranged outside the subcooling zone.

[0034] S102. Calculate the voltage difference corresponding to the liquid level difference between the inside and the outside of the subcooling zone according to the first pressure and the second pressure.

[0035] S103. Obtain the detection voltage according to the liquid level sensor.

[0036] The liquid level sensor outputs a signal of the detection voltage.

[0037] S104. Calculate the corrected voltage according to the detection voltage and the voltage difference.

[0038] S105. Obtain the actual liquid level according to the corrected voltage.

[0039] In the case of adopting the above technical solution, the present application calculates the voltage difference according to the first pressure inside the subcooling zone and the second pressure outside the subcooling zone, then calculates the corrected voltage according to the voltage difference and the detection voltage of the liquid level sensor, and obtains the actual liquid level according to the corrected voltage. The present application corrects the detection voltage of the liquid level sensor through the pressures inside and outside the subcooling zone, and can correct the deviation between the detected liquid level of the liquid level sensor and the actual liquid level when the interface at the bottom of the liquid level sensor is located in the subcooling zone, which is beneficial to improving the accuracy of the liquid level control of the chilled water air-conditioning unit.

[0040] In some embodiments, the step of "obtaining the voltage difference corresponding to the liquid level difference between the inside and the outside of the subcooling zone according to the first pressure and the second pressure" further includes: obtaining the liquid level difference according to the first pressure and the second pressure; obtaining the voltage difference according to the liquid level difference and the voltage corresponding to the liquid level per unit length.

[0041] The calculation formula for liquid pressure is p = ρgh. Among them, p represents liquid pressure, and the unit is Pascal (Pa); ρ represents the density of the liquid, and the unit is kilogram per cubic meter (kg / m³); g represents the acceleration due to gravity, and its commonly taken value is about 9.8 meters per second squared (m / s²); h represents the depth of the liquid, and the unit is meter (m). According to the calculation formula for liquid pressure, when the density of the liquid is constant, the liquid pressure is proportional to the depth of the liquid. Therefore, by measuring and comparing the first pressure and the second pressure, the liquid level difference between the inside and the outside of the subcooling zone can be deduced. The liquid level sensor can detect the liquid level within a certain range and output the voltage signal corresponding to the liquid level. Therefore, there is a specific corresponding relationship between the liquid level of the liquid level sensor and the voltage signal. According to the liquid level range and voltage range of the liquid level sensor, the voltage corresponding to the liquid level per unit length can be obtained. By multiplying the liquid level difference calculated previously by the voltage value corresponding to the liquid level per unit length, the voltage difference generated due to the liquid level difference between the inside and the outside of the subcooling zone can be obtained.

[0042] In some embodiments, the step of "obtaining the liquid level difference according to the first pressure and the second pressure" further includes: obtaining the pressure difference according to the first pressure and the second pressure. Obtaining the liquid level difference according to the pressure difference and the refrigerant density. By obtaining the liquid level difference through the first pressure and the second pressure and using physical formulas for deduction, the pressure difference between the inside and the outside of the subcooling zone can be obtained accurately and reliably.

[0043] The pressure difference can be obtained by taking the difference between the first pressure and the second pressure. For example, if the first pressure is P1 and the second pressure is P2, the pressure difference ΔP is (P1 - P2) or (P2 - P1). And since p = ρgh, then Δh = Δp / ρg. Substituting the pressure difference ΔP, the refrigerant density ρ, and the acceleration due to gravity g into it, the liquid level difference Δh can be calculated.

[0044] In some embodiments, according to the voltage range and liquid level range of the liquid level sensor, the voltage corresponding to the liquid level per unit length is obtained. The liquid level sensor can detect the liquid level within a certain range and output the voltage signal corresponding to the liquid level. Therefore, there is a specific corresponding relationship between the liquid level of the liquid level sensor and the voltage. According to the liquid level range and voltage range of the liquid level sensor, the voltage corresponding to the liquid level per unit length can be obtained. Specifically, the voltage corresponding to the liquid level per unit length is U3 / L, where U3 is the voltage range of the liquid level sensor and L is the liquid level range of the liquid level sensor.

[0045] Optionally, find the maximum voltage U max and the minimum voltage U min , and the voltage range U3 of the liquid level sensor = U max - U min .

[0046] Optionally, find the maximum liquid level L of the liquid level sensor max and the minimum liquid level L min , the voltage range L of the liquid level sensor = L max -L min .

[0047] For example, the liquid level range of the liquid level sensor is 0m to 1m, the output signal is a voltage of 1V - 5V, the voltage is 1V at the highest liquid level, and the voltage is 5V at the lowest liquid level. The voltage corresponding to the liquid level per unit length is (5 - 1) / (1 - 0) = 4V / m.

[0048] Optionally, the step of "obtaining the voltage difference according to the liquid level difference and the voltage corresponding to the liquid level per unit length" specifically includes: calculating the product of the liquid level difference and the voltage corresponding to the liquid level per unit length, and this product is the voltage difference. Specifically, the voltage difference ΔU = U3 / L * ΔP / ρg.

[0049] In some embodiments, as shown in combination with Figure 2 , the water chiller unit is further provided with a first pressure sensor 5 near the lower interface of the liquid level sensor. The first pressure is obtained through the first pressure sensor 5. The first pressure sensor 5 can detect the liquid pressure at the lower interface near the liquid level sensor in real time and output the first pressure, that is, through the first pressure sensor 5, the first pressure in the subcooling zone can be detected.

[0050] In some embodiments, as shown in combination with Figure 1 , the water chiller unit is further provided with a second pressure sensor 6. The second pressure sensor 6 is arranged at the bottom of the condenser housing and is located outside the subcooling zone. The second pressure is obtained through the second pressure sensor 6. The second pressure sensor 6 can detect the liquid pressure at the bottom of the condenser housing and outside the subcooling zone in real time and output the second pressure, that is, through the second pressure sensor 6, the second pressure outside the subcooling zone can be detected, and then the pressure inside and outside the subcooling zone is corrected according to the first pressure and the second pressure. When the interface at the bottom of the liquid level sensor is located in the subcooling zone, the deviation between the detected liquid level of the liquid level sensor and the actual liquid level is corrected, improving the accuracy of the liquid level control of the water chiller unit.

[0051] In some embodiments, the step of "calculating the corrected voltage according to the detected voltage and the voltage difference" further includes: calculating the sum of the absolute value of the voltage difference and the detected voltage to obtain the corrected voltage. By calculating the sum of the absolute value of the voltage difference and the detected voltage, the detected voltage of the liquid level sensor can be corrected, that is, U1 = U2 + |U3 / L * ΔP / ρg|, where U1 is the corrected voltage, U2 is the detected voltage, U2 is the output value of the liquid level sensor, U3 is the voltage range of the liquid level sensor, L is the liquid level range of the liquid level sensor, ΔP is the pressure difference between the inside and outside of the subcooled zone, ρ is the refrigerant density, and g is the acceleration due to gravity. The detected liquid level of the liquid level sensor is smaller than the actual liquid level.

[0052] Optionally, the step of "obtaining the actual liquid level according to the corrected voltage" further includes: obtaining the correspondence between the voltage and the actual liquid level, and substituting the corrected voltage into the correspondence to calculate and obtain the actual liquid level. Through conversion, the corrected voltage can be converted into the actual liquid level, and finally the actual liquid level is output.

[0053] According to Figure 4 As shown, the present application provides another liquid level detection method, which specifically includes the following steps:

[0054] S201, obtain the first pressure inside the subcooled zone and the second pressure outside the subcooled zone.

[0055] That is, obtain the first pressure as P1 and the second pressure as P2.

[0056] S202, obtain the pressure difference according to the first pressure and the second pressure.

[0057] That is, the pressure difference ΔP = P1 - P2, or the pressure difference ΔP = P2 - P1.

[0058] S203, obtain the liquid level difference according to the pressure difference and the refrigerant density.

[0059] That is, the liquid level difference Δh = Δp / ρg.

[0060] S204, obtain the voltage corresponding to the liquid level per unit length according to the voltage range and the liquid level range of the liquid level sensor.

[0061] That is, the voltage corresponding to the liquid level per unit length is U3 / L.

[0062] S205, obtain the voltage difference according to the liquid level difference and the voltage corresponding to the liquid level per unit length.

[0063] That is, the voltage difference ΔU = U3 / L * Δh = U3 / L * ΔP / ρg.

[0064] S206, obtain the detected voltage according to the liquid level sensor.

[0065] The liquid level sensor directly outputs a detected voltage U2.

[0066] S207, calculate the sum of the absolute value of the voltage difference and the detected voltage to obtain the corrected voltage.

[0067] That is, U1 = U2 + ΔU = U2 + |U3 / L * ΔP / ρg|.

[0068] S208, obtain the actual liquid level according to the corrected voltage.

[0069] In the case of adopting the above technical solution, the present application calculates the pressure difference according to the first pressure inside the subcooled zone and the second pressure outside the subcooled zone; according to the calculation formula of liquid pressure, when the density of the liquid is constant, the liquid pressure is proportional to the depth of the liquid. Therefore, the liquid level difference between the inside and the outside of the subcooled zone can be deduced through the pressure difference and the refrigerant density; then, by multiplying the liquid level difference by the voltage value corresponding to the liquid level per unit length, the voltage difference generated due to the liquid level difference between the inside and the outside of the subcooled zone can be obtained. Using the voltage difference to correct the detected voltage of the liquid level sensor, the corrected voltage can be obtained, and then the actual liquid level can be obtained. The present application can correct the deviation between the detected liquid level of the liquid level sensor and the actual liquid level when the interface at the bottom of the liquid level sensor is located in the subcooled zone, which is beneficial to improving the accuracy of the liquid level control of the chilled water air-conditioning unit.

[0070] The present application provides a chilled water air-conditioning unit, including a controller configured to be able to execute the above liquid level detection method. In the case of adopting the above technical solution, the chilled water air-conditioning unit provided by the present application can calculate the voltage difference according to the first pressure inside the subcooled zone and the second pressure outside the subcooled zone, and then calculate the corrected voltage according to the voltage difference and the detected voltage of the liquid level sensor, and obtain the actual liquid level according to the corrected voltage. The chilled water air-conditioning unit provided by the present application corrects the detected voltage of the liquid level sensor through the pressures inside and outside the subcooled zone, and can correct the deviation between the detected liquid level of the liquid level sensor and the actual liquid level when the interface at the bottom of the liquid level sensor is located in the subcooled zone, which is beneficial to improving the accuracy of the liquid level control of the chilled water air-conditioning unit.

[0071] The present application provides a computer-readable storage medium, in which a computer program is stored. Among them, when the computer program runs, it executes the above liquid level detection method. The above computer-readable storage medium can be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0072] The present application provides an electronic device, which includes a memory and a processor. A computer program is stored in the memory, and the processor can call and run the computer program to execute the above-mentioned liquid level detection method. Optionally, the device may further include a communication interface and a bus. Among them, the processor, the communication interface, and the memory can complete communication with each other through the bus. The communication interface can be used for information transmission. The processor can call the logical instructions in the memory to execute the liquid level detection method in the above-mentioned embodiments.

[0073] In addition, when the logical instructions in the above-mentioned memory are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0074] As a computer-readable storage medium, the memory can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the patent embodiments of the present application. By running the program instructions / modules stored in the memory, the processor executes functional applications and data processing, that is, implements the liquid level detection method in the above-mentioned embodiments.

[0075] The memory may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory may include a high-speed random access memory and may also include a non-volatile memory.

[0076] The technical solution of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, including: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, or may also be a transitory storage medium.

[0077] Although the steps are described in the above-mentioned order in the above embodiments, those skilled in the art can understand that in order to achieve the effects of the present embodiments, different steps do not have to be executed in such an order, and they can be executed simultaneously (in parallel) or in a reversed order. These simple changes are all within the protection scope of the present application.

[0078] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A liquid level detection method is applied to a chilled water air conditioning unit. The chilled water air conditioning unit includes a condenser housing, as well as a baffle plate, a subcooling partition plate, and a liquid level sensor disposed within the condenser housing. The subcooling partition plate divides a subcooling area within the condenser housing, and the baffle plate is located in the subcooling area; characterized in that, When the lower interface of the liquid level sensor is located in the subcooled zone, the liquid level detection method includes: Obtaining a first pressure inside the subcooled zone and a second pressure outside the subcooled zone; Calculating a voltage difference corresponding to a liquid level difference between inside and outside the subcooled zone according to the first pressure and the second pressure; Obtaining a detection voltage according to the liquid level sensor; Calculating a corrected voltage according to the detection voltage and the voltage difference; Obtaining an actual liquid level according to the corrected voltage.

2. The liquid level detection method according to claim 1, characterized in that, The step of "calculating a voltage difference corresponding to a liquid level difference between inside and outside the subcooled zone according to the first pressure and the second pressure" further includes: Obtaining a liquid level difference according to the first pressure and the second pressure; Obtaining the voltage difference according to the liquid level difference and the voltage corresponding to a unit length of liquid level.

3. The liquid level detection method according to claim 2, characterized in that The step of "obtaining a liquid level difference according to the first pressure and the second pressure" further includes: Obtaining a pressure difference according to the first pressure and the second pressure; Obtaining the liquid level difference according to the pressure difference and the refrigerant density.

4. The liquid level detection method according to claim 2, characterized in that, Obtaining the voltage corresponding to a unit length of liquid level according to the voltage range and liquid level range of the liquid level sensor.

5. The liquid level detection method according to any one of claims 1 to 4, characterized in that, The water chiller unit is further provided with a first pressure sensor near the lower interface of the liquid level sensor; Obtaining the first pressure through the first pressure sensor.

6. The liquid level detection method according to any one of claims 1 to 4, characterized in that, The water chiller unit is further provided with a second pressure sensor, and the second pressure sensor is arranged at the bottom of the condenser housing and located outside the subcooled zone; Obtaining the second pressure through the second pressure sensor.

7. The liquid level detection method according to any one of claims 1 to 4, characterized in that, The step of "calculating a corrected voltage according to the detection voltage and the voltage difference" further includes: Calculating the sum of the absolute value of the voltage difference and the detection voltage to obtain the corrected voltage.

8. An electronic device, comprising a memory and a processor, characterized in that, A computer program is stored in the memory, and the processor can call and run the computer program to execute the liquid level detection method according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, A computer program is stored in the computer-readable storage medium, wherein the computer program executes the liquid level detection method according to any one of claims 1 to 7 when running.

10. A cold water air conditioning unit, comprising a controller, characterized in that, The controller is configured to be able to execute the liquid level detection method according to any one of claims 1 to 7.

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