Method and system for measuring and adjusting stock of snow seeds

Abstract

The invention relates to the technical field of snow type adjustment and measurement, in particular to a method and system for measuring and adjusting snow type stock, and the method for measuring the snow type stock comprises the following steps: S1, obtaining a target operation temperature value of an air conditioner; s2, a target operation state is obtained according to the indoor temperature value of the air conditioner and the target operation temperature value; s3, obtaining a target temperature range, a target pressure range and a target object form of the snow species according to the reasonable stock value of the snow species in the snow species storage and each target operation state; s4, when the air conditioner adjusts the indoor temperature value, whether the number of snow types in the snow type storage device is too large or too small or not is judged according to the target temperature range, the target pressure intensity range and the target object form in sequence; and S5, according to the target temperature range, the target pressure intensity range and the comparison value of the target object form and the snow type state at the outlet, a plurality of stored snow types are added into or extracted out of a snow type storage device.

Description

Technical Field

[0001] The present invention relates to the field of refrigerant adjustment and measurement technology, and in particular to a method and system for measuring and adjusting refrigerant inventory. Background Art

[0002] In the maintenance process of existing air-conditioning equipment, it is usually necessary to determine the amount of refrigerant in order to ensure the normal operation of the air-conditioning system. Maintenance personnel in the industry use a pressure gauge to detect the pressure in the refrigerant tank, thereby indirectly inferring the amount of refrigerant. Although this method is effective, most home users do not have the tools or ability to directly monitor the amount of refrigerant. They can only rely on maintenance personnel to check. Therefore, once there is a problem with the air conditioner, professional maintenance services must be used to find out whether refrigerant needs to be added. Traditional methods rely on the experience and manual operation of maintenance personnel, and users usually judge whether there is enough refrigerant in the air conditioner by feeling the air outlet temperature of the air conditioner, feeling the temperature of the outdoor unit of the air conditioner, and observing whether the indoor unit is leaking. Therefore, traditional judgment methods have certain errors and lags. Summary of the invention

[0003] In view of the above-mentioned defects, the purpose of the present invention is to propose a method and system for measuring and adjusting the refrigerant inventory, aiming to solve the lag and complexity of traditional refrigerant measurement methods and to adjust the air-conditioning refrigerant in time when the refrigerant content in the air-conditioning is abnormal.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A method for measuring and adjusting the amount of refrigerant stored is applied to an air conditioner, the air conditioner comprises a refrigerant controller, a refrigerant storage, a compressor, a condenser, an expansion valve and an evaporator, the refrigerant controller is used to add refrigerant to the refrigerant storage or extract refrigerant from the refrigerant storage, and the method for measuring the amount of refrigerant stored comprises the following steps:

[0006] S1: Obtain the target operating temperature value of the air conditioner;

[0007] S2: obtaining target operating states of the compressor, condenser, expansion valve and evaporator according to the temperature value of the room where the air conditioner is located and the target operating temperature value;

[0008] S3: according to the reasonable stock value of the refrigerant in the refrigerant storage device and each of the target operating states, obtaining the target temperature range, target pressure range and target object shape of the refrigerant at the outlet of the compressor, the condenser, the expansion valve and the evaporator;

[0009] S4: when the air conditioner adjusts the indoor temperature, the refrigerant status at the outlet of the compressor, the condenser, the expansion valve and the evaporator is obtained, and whether the refrigerant in the refrigerant storage is too much or too little according to one or more of the target temperature range, the target pressure range and the target object shape in the order of the compressor, the condenser, the expansion valve and the evaporator;

[0010] The state of the snow type includes one or more of the temperature, pressure and physical form of the snow type;

[0011] S5: When there is too much or too little refrigerant in the refrigerant storage, the refrigerant controller adds or extracts a certain amount of refrigerant into the refrigerant storage according to a comparison value between one or more of the target temperature range, the target pressure range, and the target object shape and the refrigerant state at the outlet of the compressor, the condenser, the expansion valve, and the evaporator.

[0012] Preferably, in step S4, when the air conditioner is cooling:

[0013] Obtain the temperature and pressure of the refrigerant at the inlet of the compressor;

[0014] Calculating a first temperature difference and a first pressure difference at the inlet and outlet of the compressor according to the temperature and pressure of the refrigerant at the inlet and outlet of the compressor;

[0015] If the temperature of the refrigerant at the outlet of the compressor is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the compressor and / or the pressure of the refrigerant at the outlet of the compressor is lower than the minimum value of the target pressure range of the pressure at the outlet of the compressor, then determine whether the first temperature difference is smaller than the minimum difference between the target temperature range of the refrigerant at the outlet of the compressor and the target temperature range of the refrigerant at the inlet of the compressor and / or whether the first pressure difference is smaller than the minimum difference between the target pressure range of the refrigerant at the outlet of the compressor and the target pressure range of the refrigerant at the inlet of the compressor. If so, there is too little refrigerant in the refrigerant storage;

[0016] If the temperature of the refrigerant at the outlet of the compressor is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the compressor and / or the pressure of the refrigerant at the outlet of the compressor is higher than the maximum value of the target pressure range of the pressure at the outlet of the compressor, it is determined whether the first temperature difference is greater than the maximum difference between the target temperature range of the refrigerant at the outlet of the compressor and the target temperature range of the refrigerant at the inlet of the compressor. If so, there is too much refrigerant in the refrigerant storage.

[0017] Preferably, in step S4, it also includes judging whether the refrigerant in the refrigerant storage is too much or too little according to the operating current of the compressor;

[0018] obtaining a target operating current of the compressor according to a target operating state of the compressor;

[0019] If the operating current of the compressor is less than the target operating current and the difference between the operating current and the target operating current is greater than a first threshold, then the refrigerant in the refrigerant storage is too little;

[0020] If the operating current of the compressor is greater than the target operating current and the difference between the operating current and the target operating current is greater than a second threshold, then there is too much refrigerant in the refrigerant storage.

[0021] Preferably, in step S4, when the air conditioner is cooling:

[0022] If the temperature of the refrigerant at the outlet of the condenser is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the condenser, the refrigerant in the refrigerant storage is too little;

[0023] If the temperature of the refrigerant at the outlet of the condenser is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the condenser, there is too much refrigerant in the refrigerant storage.

[0024] Preferably, in step S4, when the air conditioner is cooling:

[0025] Obtaining a ratio of gas to liquid at an outlet of the expansion valve, and obtaining a target object shape ratio range according to the target object shape at the outlet of the expansion valve;

[0026] If the ratio of gas to liquid at the outlet of the expansion valve is higher than the maximum value of the target object morphology ratio range, there is too little refrigerant in the refrigerant storage;

[0027] If the ratio of gas to liquid at the outlet of the expansion valve is lower than the minimum value of the target object morphology ratio range, there is too much refrigerant in the refrigerant storage.

[0028] Preferably, in step S4, when the air conditioner is cooling:

[0029] Obtain the temperature and pressure of the refrigerant at the outlet of the expansion valve;

[0030] Calculating a second temperature difference and a second pressure difference at the inlet and outlet of the expansion valve according to the temperature and pressure of the refrigerant at the inlet and outlet of the expansion valve;

[0031] If the temperature of the refrigerant at the outlet of the expansion valve is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the expansion valve and / or the pressure of the refrigerant at the outlet of the expansion valve is higher than the maximum value of the target pressure range of the pressure at the outlet of the expansion valve, then it is determined whether the second temperature difference is greater than the maximum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve and / or whether the second pressure difference is greater than the maximum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve. If so, there is too little refrigerant in the refrigerant storage;

[0032] If the temperature of the refrigerant at the outlet of the expansion valve is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the expansion valve and / or the pressure of the refrigerant at the outlet of the expansion valve is lower than the minimum value of the target pressure range of the pressure at the outlet of the expansion valve, then determine whether the second temperature difference is lower than the minimum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve and / or whether the second pressure difference is lower than the minimum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve. If so, there is too much refrigerant in the refrigerant storage.

[0033] Preferably, if the air conditioner is in heating mode, in step S4, the order of the compressor, evaporator, expansion valve and condenser is used to determine whether there is too much or too little refrigerant in the refrigerant storage according to one or more of the target temperature range, target pressure range and target object shape.

[0034] Preferably, a certain amount of stored refrigerant is added to or extracted from the refrigerant storage according to a comparison value of one or more of the target temperature range, the target pressure range, the target object shape and the refrigerant state at the outlet of the compressor, the condenser, the expansion valve and the evaporator, satisfying the relationship:

[0035] Δm=k1·ΔT+k2·ΔP+k3·Δh+β1(ΔT) 2 +β2(ΔP) 2 +β3(Δh) 2 ;

[0036]

[0037] Wherein, Δm represents the amount of refrigerant extracted or added, k1 represents the sensitivity of the control temperature to the adjustment of the refrigerant amount, k2 represents the sensitivity of the control pressure to the adjustment of the refrigerant amount, k3 represents the sensitivity of the control object shape ratio to the adjustment of the refrigerant amount, ΔT represents the difference between the temperature at the outlet of the compressor, condenser or expansion valve and the maximum or minimum value of the target temperature range, ΔP represents the difference between the pressure at the outlet of the compressor, condenser or expansion valve and the maximum or minimum value of the target pressure range, Δh represents the difference between the ratio of gas to liquid at the outlet of the expansion valve and the maximum or minimum value of the target object shape ratio range, Indicates the ratio of gas to liquid at the outlet of the expansion valve. It represents the maximum or minimum value of the target object's morphological ratio range. β1, β2 and β3 represent the secondary effects of temperature, pressure and gas-liquid ratio on the adjustment of refrigerant stock, respectively.

[0038] A system for measuring and adjusting the amount of refrigerant, the system for measuring and adjusting the amount of refrigerant is applied to the method for measuring and adjusting the amount of refrigerant as described above, the method for measuring and adjusting the amount of refrigerant is applied to an air conditioner, the air conditioner comprises a refrigerant controller, a refrigerant storage, a compressor, a condenser, an expansion valve and an evaporator, the refrigerant controller is used to add refrigerant to the refrigerant storage or extract refrigerant from the refrigerant storage, the system for measuring and adjusting the amount of refrigerant comprises:

[0039] A target temperature acquisition module is used to obtain a target operating temperature value of the air conditioner;

[0040] An operating state calculation module, used for obtaining the target operating states of the compressor, condenser, expansion valve and evaporator according to the temperature value of the room where the air conditioner is located and the target operating temperature value;

[0041] A target state setting module, for obtaining a target temperature range, a target pressure range and a target object shape of the refrigerant at the outlet of the compressor, the condenser, the expansion valve and the evaporator according to a reasonable stock value of the refrigerant in the refrigerant storage device and each of the target operating states;

[0042] A refrigerant stock measurement module is used to obtain the refrigerant status at the outlets of the compressor, condenser, expansion valve and evaporator when the air conditioner adjusts the indoor temperature value, and judge whether the refrigerant in the refrigerant storage is too much or too little according to one or more of the target temperature range, target pressure range and target object shape in the order of the compressor, condenser, expansion valve and evaporator;

[0043] The state of the snow type includes one or more of the temperature, pressure and physical form of the snow type;

[0044] The refrigerant stock adjustment module is used to add or extract a certain amount of refrigerant stock into the refrigerant storage when there is too much or too little refrigerant in the refrigerant storage. The refrigerant controller adds or extracts a certain amount of refrigerant stock into the refrigerant storage according to the comparison value of one or more of the target temperature range, target pressure range, target object shape and the refrigerant state at the outlet of the compressor, condenser, expansion valve and evaporator.

[0045] One of the above technical solutions has the following advantages or beneficial effects:

[0046] The present invention monitors the temperature, pressure and physical state changes of various air-conditioning components (such as compressor, condenser, expansion valve and evaporator) in real time in an intelligent manner, automatically detects and adjusts the refrigerant inventory, avoids traditional detection methods that rely on manual experience and professional tools, and improves the operating efficiency and stability of the air conditioner; for users, professional operating skills or detection equipment are no longer required, and the air conditioner can automatically complete the detection and adjustment of the refrigerant, greatly simplifying the use and maintenance process; because the amount of refrigerant used can be accurately controlled, the air conditioner can maintain efficient cooling / heating while effectively reducing the loss caused by too much or too little refrigerant, extending the service life of the air-conditioning equipment, and reducing the cost caused by frequent maintenance, while simplifying the user's operating experience, making the air conditioner more intelligent, convenient and efficient, and increasing the practicality of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0048] Figure 1 is a flow chart of a method for measuring and adjusting refrigerant inventory provided by an embodiment of the present invention;

[0049] Figure 2 is a structural schematic diagram of a system for measuring and adjusting refrigerant inventory provided by an embodiment of the present invention;

[0050] Figure 3 It is a schematic diagram of the refrigeration system structure of the air conditioner in the cooling mode according to the method for measuring and adjusting the refrigerant stock provided by the embodiment of the present invention;

[0051] Figure 4 It is a schematic diagram of the refrigeration system structure of the air conditioner in the heating mode according to the method for measuring and adjusting the refrigerant stock provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] In the present invention, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0054] In the maintenance process of existing air-conditioning equipment, it is usually necessary to determine the amount of refrigerant in order to ensure the normal operation of the air-conditioning system. Maintenance personnel in the industry use a pressure gauge to detect the pressure in the refrigerant tank, thereby indirectly inferring the amount of refrigerant. Although this method is effective, most home users do not have the tools or ability to directly monitor the amount of refrigerant. They can only rely on maintenance personnel to check. Therefore, once there is a problem with the air conditioner, professional maintenance services must be used to find out whether refrigerant needs to be added. Traditional methods rely on the experience and manual operation of maintenance personnel, and users usually judge whether there is enough refrigerant in the air conditioner by feeling the air outlet temperature of the air conditioner, feeling the temperature of the outdoor unit of the air conditioner, and observing whether the indoor unit is leaking. Therefore, traditional judgment methods have certain errors and lags.

[0055] Therefore, a method for measuring and adjusting the amount of refrigerant is proposed. The method for measuring the amount of refrigerant is applied to an air conditioner. The air conditioner includes a refrigerant controller, a refrigerant storage, a compressor, a condenser, an expansion valve, and an evaporator. The refrigerant controller is used to add refrigerant to the refrigerant storage or extract refrigerant from the refrigerant storage. Figure 1 As shown, in a preferred embodiment of the present invention, the method for measuring the amount of refrigerant stock comprises the following steps:

[0056] S1: Obtain the target operating temperature value of the air conditioner;

[0057] The target operating temperature is the ideal temperature that the air conditioner user wants the air conditioner to adjust to. It is set by the user on the air conditioner remote control, or by the air conditioner automatic adjustment system according to environmental requirements. The air conditioner decides to start the cooling or heating mode by comparing the actual indoor temperature with the target temperature. Each component of the air conditioner (such as the compressor, condenser, expansion valve and evaporator) needs to adjust the corresponding working state according to the set target temperature to achieve efficient cooling or heating effects.

[0058] S2: obtaining target operating states of the compressor, condenser, expansion valve and evaporator according to the temperature value of the room where the air conditioner is located and the target operating temperature value;

[0059] During the operation of the air conditioner, the difference between the indoor temperature and the target temperature determines how the air conditioner adjusts its working state. If the indoor temperature is higher than the target value, the air conditioner will start the cooling mode; conversely, if the indoor temperature is lower than the target value, the heating mode will be turned on. The control system of the air conditioner adjusts the output power of the compressor, the working intensity of the condenser, and the response of the expansion valve and evaporator according to the temperature difference, so that the air conditioner can adjust the working mode of each component in time according to the needs, thereby maintaining an efficient heat exchange and air conditioning process.

[0060] In actual application, the specific method is to collect the current indoor temperature value in the built-in temperature sensor of the air conditioner and compare it with the target temperature set by the user. The control system of the air conditioner determines whether to turn on the cooling or heating mode based on this temperature difference. When the temperature difference is large, the air conditioner will accelerate the start of its cooling or heating function; when the temperature difference is small, the power or operating speed of the compressor can be adjusted to more accurately approach the target temperature. By continuously detecting the indoor temperature and adjusting the operating status of the air conditioner in real time (such as compressor frequency, condenser working mode, etc.), the temperature is ensured to be stable near the target value set by the user.

[0061] S3: according to the reasonable stock value of the refrigerant in the refrigerant storage device and each of the target operating states, obtaining the target temperature range, target pressure range and target object shape of the refrigerant at the outlet of the compressor, the condenser, the expansion valve and the evaporator;

[0062] The amount of refrigerant in the refrigerant storage must be within a reasonable range to ensure the normal operation of the air conditioner. Refrigerant can also be called refrigerant and coolant. Similarly, each air conditioning system has a designed refrigerant amount range, which is specified by the air conditioning manufacturer according to the needs of the refrigeration system. The reasonable amount of refrigerant affects the operating efficiency and stability of the system. Under the target operating state (such as set temperature value, actual temperature difference, etc.), according to the working requirements of different components, the air conditioning system will set the target range of temperature, pressure and physical state at the outlet of each component (compressor, condenser, expansion valve, evaporator). For example, in the cooling mode, the compressor should output a certain pressure and temperature, the condenser should convert the high-temperature gas into liquid, and the expansion valve and evaporator should adjust the state of the refrigerant to ensure the normal cooling of the air conditioner.

[0063] In actual applications, the working state of each component is determined according to the target operating state, which involves the linkage between the air conditioning control system and multiple sensors and actuators. The air conditioning system will obtain relevant data on the refrigerant inventory under reasonable conditions through monitoring sensors (such as pressure sensors, temperature sensors, etc.), and then deduce the working state of each component (compressor, expansion valve, condenser, evaporator) under normal refrigerant inventory. For example, when the air conditioner is in cooling mode, the compressor needs to compress the refrigerant at a certain power, the condenser needs to effectively dissipate heat and liquefy the refrigerant, and the expansion valve needs to adjust the flow of the refrigerant to control the refrigerant pressure in the evaporator so that the air conditioner can perform efficient heat exchange. According to these requirements, the air conditioning control system will accurately adjust the working parameters of each component through the actuator, such as the range of temperature and pressure of the refrigerant after the compressor compresses the refrigerant, or the ratio of gaseous refrigerant to liquid after the expansion valve processes the refrigerant.

[0064] S4: when the air conditioner adjusts the indoor temperature, the refrigerant status at the outlet of the compressor, the condenser, the expansion valve and the evaporator is obtained, and whether the refrigerant in the refrigerant storage is too much or too little according to one or more of the target temperature range, the target pressure range and the target object shape in the order of the compressor, the condenser, the expansion valve and the evaporator;

[0065] The state of the snow type includes one or more of the temperature, pressure and physical form of the snow type;

[0066] Among them, the reason for judging in the order of compressor, condenser, expansion valve and evaporator is that the refrigerant moves from compressor-condenser-expansion valve-evaporator during refrigeration. Figure 3 As shown, if it is sufficient to judge whether there is a lack or excess of refrigerant at the compressor, no subsequent judgment is required. If the lack of refrigerant cannot be detected at the compressor, it can be judged from the condenser, expansion valve or evaporator. The direction of the refrigerant can be used to detect the refrigerant, which can reduce the complexity of detection and increase convenience.

[0067] During the operation of the air conditioner, sensors are used to continuously monitor the working status of the compressor, condenser, expansion valve and evaporator, especially the temperature, pressure and physical state changes (gas, liquid or gas-liquid mixture) at these components, which can be used to determine whether the refrigerant inventory is reasonable. If there is too little refrigerant, the pressure and temperature output by the compressor will be lower than normal; if there is too much refrigerant, the pressure and temperature at the condenser and expansion valve may exceed the expected range. Specifically, if insufficient refrigerant pressure is detected at the compressor, it means that there is too little refrigerant; if the temperature at the condenser is too low, it means that there is too much refrigerant. Through the data obtained at different locations, the air conditioner can determine whether the refrigerant needs to be adjusted.

[0068] S5: When there is too much or too little refrigerant in the refrigerant storage, the refrigerant controller adds or extracts a certain amount of refrigerant into the refrigerant storage according to a comparison value between one or more of the target temperature range, the target pressure range, and the target object shape and the refrigerant state at the outlet of the compressor, the condenser, the expansion valve, and the evaporator.

[0069] When the air conditioner detects that the refrigerant stock is abnormal (i.e. too much or too little), the refrigerant controller will adjust the refrigerant storage according to the real-time monitored temperature, pressure and physical state data. If there is too little refrigerant, the air conditioner will start the refrigerant addition process, and the refrigerant controller will inject new refrigerant into the refrigerant storage through the pipeline; if there is too much refrigerant, the refrigerant controller will start the extraction process to discharge the excess refrigerant. During the adjustment process, the refrigerant controller will accurately compare the target temperature range, target pressure range and target physical state range of the compressor, condenser, expansion valve and evaporator to ensure that the refrigerant stock remains within a reasonable range to avoid affecting the working efficiency of the air conditioner due to insufficient or excessive refrigerant.

[0070] Through intelligent real-time monitoring of the temperature, pressure and physical state changes of air-conditioning components (such as compressors, condensers, expansion valves and evaporators), automatic detection and adjustment of refrigerant stocks, avoiding traditional detection methods that rely on manual experience and professional tools, and improving the operating efficiency and stability of air conditioners; for users, professional operating skills or detection equipment are no longer required, the air conditioner can automatically complete the detection and adjustment of refrigerants, greatly simplifying the use and maintenance process; because the amount of refrigerant used can be accurately controlled, the air conditioner can maintain efficient cooling / heating while effectively reducing the loss caused by too much or too little refrigerant, extending the service life of air-conditioning equipment, and reducing the cost caused by frequent maintenance, while simplifying the user's operating experience, making the air conditioner more intelligent, convenient and efficient, and increasing the practicality of the air conditioner.

[0071] Preferably, in step S4, when the air conditioner is cooling:

[0072] Obtain the temperature and pressure of the refrigerant at the inlet of the compressor;

[0073] Calculating a first temperature difference and a first pressure difference at the inlet and outlet of the compressor according to the temperature and pressure of the refrigerant at the inlet and outlet of the compressor;

[0074] If the temperature of the refrigerant at the outlet of the compressor is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the compressor and / or the pressure of the refrigerant at the outlet of the compressor is lower than the minimum value of the target pressure range of the pressure at the outlet of the compressor, then determine whether the first temperature difference is smaller than the minimum difference between the target temperature range of the refrigerant at the outlet of the compressor and the target temperature range of the refrigerant at the inlet of the compressor and / or whether the first pressure difference is smaller than the minimum difference between the target pressure range of the refrigerant at the outlet of the compressor and the target pressure range of the refrigerant at the inlet of the compressor. If so, there is too little refrigerant in the refrigerant storage;

[0075] If the temperature of the refrigerant at the outlet of the compressor is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the compressor and / or the pressure of the refrigerant at the outlet of the compressor is higher than the maximum value of the target pressure range of the pressure at the outlet of the compressor, it is determined whether the first temperature difference is greater than the maximum difference between the target temperature range of the refrigerant at the outlet of the compressor and the target temperature range of the refrigerant at the inlet of the compressor. If so, there is too much refrigerant in the refrigerant storage.

[0076] In the cooling mode of the air conditioner, the compressor is responsible for compressing the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure gas. The temperature and pressure of the refrigerant at the inlet of the compressor reflect the state of the refrigerant entering the compressor. The temperature and pressure of the refrigerant at the inlet are the basis for calculating whether the refrigerant is sufficient and whether it is within the target range. If the temperature or pressure of the refrigerant deviates from the normal value, it may affect the working efficiency of the compressor or cause equipment damage.

[0077] Based on the refrigerant temperature and pressure data at the compressor inlet and outlet, the temperature difference between the compressor outlet refrigerant temperature and the inlet refrigerant temperature and the pressure difference between the compressor outlet and the inlet refrigerant pressure can be calculated, which reflects the compressor's impact on the compression and temperature change of the refrigerant. If the compressor works properly, these two differences should be within a certain range, which is determined by the temperature of the room where the air conditioner is located and the target adjustment temperature.

[0078] When there is too little refrigerant, the amount of gas entering the compressor is insufficient, resulting in low suction pressure and temperature of the compressor. Due to the insufficient amount of refrigerant, the compression efficiency of the compressor decreases, and the temperature rise of the compressed gas is small, resulting in a low temperature at the compressor outlet. At the same time, insufficient refrigerant makes the compressor's workload light, resulting in low outlet pressure. The pressure difference and temperature difference at the compressor outlet and inlet are lower than normal, and cannot reach the high pressure range required for normal operation. In this case, the cooling effect of the air conditioner deteriorates, and the working state of the compressor and other system components is unstable. Therefore, if there is insufficient refrigerant, the compressor cannot effectively compress the gas, resulting in a weakened overall cooling effect of the air conditioner, and the cooling efficiency of the air conditioner will be significantly reduced, or even unable to cool.

[0079] In contrast to too little refrigerant storage, when there is too much refrigerant, the amount of gas entering the compressor is too large, resulting in excessive gas pressure and temperature on the suction side. The compressor is loaded with more gas when compressing the excess gas, the compression efficiency decreases, and the temperature and pressure of the compressed gas will increase. Too much refrigerant causes the exhaust pressure of the compressor to be too high, and even causes the pressure of the compressor to exceed the design limit, causing a malfunction. In addition, excessive refrigerant may overload components such as the condenser and expansion valve, further affecting the stability and cooling effect of the air conditioner.

[0080] Preferably, in step S4, it also includes judging whether the refrigerant in the refrigerant storage is too much or too little according to the operating current of the compressor;

[0081] obtaining a target operating current of the compressor according to a target operating state of the compressor;

[0082] If the operating current of the compressor is less than the target operating current and the difference between the operating current and the target operating current is greater than a first threshold, then the refrigerant in the refrigerant storage is too little;

[0083] If the operating current of the compressor is greater than the target operating current and the difference between the operating current and the target operating current is greater than a second threshold, then there is too much refrigerant in the refrigerant storage.

[0084] Specifically, the operation of the compressor is based on the process of sucking in refrigerant vapor and compressing it. When the amount of refrigerant is insufficient, the amount of gas sucked in by the compressor decreases, which in turn causes the pressure and temperature of the refrigerant to decrease compared to normal conditions. Since the amount of gas sucked in is small, the compressor needs to consume less energy to complete the compression process, so its operating current is reduced. When the refrigerant is insufficient, there is less gas in the compressor, resulting in a reduction in the load of the compressor. Since the working principle of the compressor is to compress the sucked gas into high-pressure gas, a small amount of gas means that the compressor needs less power to complete the compression, which leads to a decrease in the operating current. Since the compressor itself will suffer losses when it operates for a long time, its operating current may change. Therefore, a first threshold is set as a buffer value for whether the compressor is operating normally. Only when it is less than the target operating current and exceeds the first threshold, it is considered that there is too little refrigerant in the refrigerant storage. The target operating current is obtained based on the target operating state of the compressor, that is, in step S2, it is determined by the indoor temperature, the target operating temperature value and the model of the air conditioner refrigeration system. On the contrary, if the actual operating current is greater than the target operating current, and the difference with the target operating current is greater than the second threshold, it can be determined that there is too much refrigerant in the refrigerant storage.

[0085] Assuming that the target operating current of the compressor is 10 amps, the first threshold is 1.5 amps, and the second threshold is 2.0 amps, if the actual operating current is less than the target current and the difference with the target current is greater than the first threshold, it means that the refrigerant is too little. For example, when the actual operating current of the compressor is 8 amps, the difference with the target current is calculated to be 2 amps (10 amps minus 8 amps). Since the difference is greater than the first threshold of 1.5 amps and the actual current is less than the target current, it can be judged that the refrigerant is too little. If the actual operating current is greater than the target current and the difference with the target current is greater than the second threshold, it means that there is too much refrigerant. For example, when the actual operating current of the compressor is 12 amps, the difference with the target current is calculated to be 2 amps (12 amps minus 10 amps). Since the difference is equal to the second threshold of 2.0 amps and the actual current is greater than the target current, it can be judged that there is too much refrigerant. If the difference between the actual operating current and the target current is less than the threshold, it means that the amount of refrigerant is within the normal range.

[0086] Preferably, in step S4, when the air conditioner is cooling:

[0087] If the temperature of the refrigerant at the outlet of the condenser is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the condenser, the refrigerant in the refrigerant storage is too little;

[0088] If the temperature of the refrigerant at the outlet of the condenser is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the condenser, there is too much refrigerant in the refrigerant storage.

[0089] In the refrigeration cycle, the refrigerant is compressed by the compressor and enters the condenser. In the condenser, the refrigerant absorbs heat from the surrounding environment and gradually cools down. If the amount of refrigerant is too little, the condenser cannot fully exert its heat dissipation effect, resulting in the temperature of the refrigerant unable to be reduced to a normal value within the target range, and the temperature will be too high. When there is insufficient refrigerant to absorb and transfer heat, the efficiency of the air conditioner's refrigeration system will decrease, which is manifested as the temperature at the condenser outlet being higher than the maximum value of the expected target range, thereby determining that there is too little refrigerant in the refrigerant storage.

[0090] The refrigerant should maintain a certain temperature range in the condenser. This range is based on normal working conditions. The refrigerant should be able to effectively release heat and avoid excessive liquid refrigerant from being retained in the condenser. If there is too much refrigerant, the refrigerant cannot be completely vaporized in the condenser, resulting in the temperature of the liquid refrigerant being too low when entering the evaporator, so that the refrigerant temperature at the condenser outlet is lower than the lower limit of the normal range. Too much refrigerant will reduce the normal refrigeration efficiency and may cause liquid refrigerant to enter the compressor, which will have an adverse effect on the compressor. Therefore, when the condenser outlet temperature is lower than the minimum value of the target temperature range, it can be determined that there is too much refrigerant in the refrigerant storage. Since the high-temperature and high-pressure gas entering the condenser becomes a low-temperature and high-pressure condensate after being processed by the condenser, the ratio of the refrigerant gas content to the liquid content at the condenser outlet can also be detected to determine the result of the condenser processing and whether there is too much refrigerant (refrigerant). If there is too much refrigerant, the condenser does not have enough time and space to completely transform the refrigerant from gas to liquid, so that part of the refrigerant may still remain in gas state, or even a liquid-gas mixture. Therefore, when there is too much refrigerant, a gas-liquid mixture may appear at the condenser outlet.

[0091] Preferably, in step S4, when the air conditioner is cooling:

[0092] Obtaining a ratio of gas to liquid at an outlet of the expansion valve, and obtaining a target object shape ratio range according to the target object shape at the outlet of the expansion valve;

[0093] If the ratio of gas to liquid at the outlet of the expansion valve is higher than the maximum value of the target object morphology ratio range, there is too little refrigerant in the refrigerant storage;

[0094] If the ratio of gas to liquid at the outlet of the expansion valve is lower than the minimum value of the target object morphology ratio range, there is too much refrigerant in the refrigerant storage.

[0095] The target object shape ratio range is a reasonable range set in the air conditioner design according to the physical properties of the refrigerant and the cooling demand. It means that the gas-liquid ratio of the refrigerant at the outlet of the expansion valve should be in an optimal range. Within this range, the liquid-gas mixture of the refrigerant can efficiently complete the evaporation heat absorption process to ensure the maximum cooling effect. If the liquid-gas ratio is too high or too low, it may cause unstable performance of the air conditioner or damage the equipment. Therefore, keeping the ratio of gas to liquid at the outlet of the expansion valve within the target object shape ratio range is the key to ensure the normal operation of the air conditioner.

[0096] When the ratio of gas to liquid at the outlet of the expansion valve is higher than the maximum value of the target object morphology ratio range, it means that most of the refrigerant at the outlet of the expansion valve exists in gaseous state, and the proportion of liquid refrigerant is very low, resulting in insufficient liquid refrigerant injected into the evaporator by the expansion valve, and too high a proportion of gaseous refrigerant. In a normal refrigeration system, the expansion valve should control the liquid-to-gas ratio of the refrigerant to keep it within an appropriate range to ensure that the liquid refrigerant can fully evaporate and absorb the heat of the indoor air to achieve the cooling effect. If the amount of refrigerant is too small and the liquid refrigerant is insufficient, resulting in the gas dominating at the outlet of the expansion valve, then it can be determined that there is too little refrigerant in the refrigerant storage, and too little refrigerant will lead to a weakened cooling effect.

[0097] When the ratio of gas to liquid at the outlet of the expansion valve is lower than the minimum value of the target object shape ratio range, it indicates that most of the refrigerant at the outlet of the expansion valve exists in liquid state, the proportion of gaseous refrigerant is low, and the amount of liquid refrigerant input into the expansion valve is too large, resulting in the failure of the liquid refrigerant to be completely vaporized and the gas ratio is insufficient. If there is too much liquid refrigerant at the outlet of the expansion valve, the liquid refrigerant entering the evaporator cannot be fully vaporized and cannot effectively absorb heat, the refrigeration effect will be reduced, and in addition, too much liquid refrigerant may flow into the compressor, causing the compressor to be in danger of liquid hammer. Therefore, when the ratio of gas to liquid at the outlet of the expansion valve is lower than the minimum value of the target object shape ratio range, it means that there is too much refrigerant in the refrigerant storage and adjustment is required.

[0098] Preferably, in step S4, when the air conditioner is cooling:

[0099] Obtain the temperature and pressure of the refrigerant at the outlet of the expansion valve;

[0100] Calculating a second temperature difference and a second pressure difference at the inlet and outlet of the expansion valve according to the temperature and pressure of the refrigerant at the inlet and outlet of the expansion valve;

[0101] If the temperature of the refrigerant at the outlet of the expansion valve is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the expansion valve and / or the pressure of the refrigerant at the outlet of the expansion valve is higher than the maximum value of the target pressure range of the pressure at the outlet of the expansion valve, then it is determined whether the second temperature difference is greater than the maximum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve and / or whether the second pressure difference is greater than the maximum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve. If so, there is too little refrigerant in the refrigerant storage;

[0102] If the temperature of the refrigerant at the outlet of the expansion valve is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the expansion valve and / or the pressure of the refrigerant at the outlet of the expansion valve is lower than the minimum value of the target pressure range of the pressure at the outlet of the expansion valve, then determine whether the second temperature difference is lower than the minimum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve and / or whether the second pressure difference is lower than the minimum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve. If so, there is too much refrigerant in the refrigerant storage.

[0103] Among them, the second temperature difference refers to the difference between the temperature at the outlet of the expansion valve and the temperature at the inlet, and the second pressure difference refers to the difference between the pressure at the outlet of the expansion valve and the pressure at the inlet. Assuming that when a certain model of air conditioner is performing a refrigeration task, the temperature at the inlet of the expansion valve is -5°C and the pressure is 1.5MPa, while the target temperature range at the outlet of the expansion valve is -10°C to -8°C, and the target pressure range is 1.2MPa to 1.4Mpa. Assuming that at this time, the actual temperature at the outlet of the expansion valve is -7°C and the pressure is 1.45Mpa. Based on these data, the second temperature difference and the second pressure difference are first calculated: the second temperature difference is the outlet temperature of the expansion valve minus the inlet temperature of the expansion valve, that is, -7°C-(-5°C)=-2°C; the second pressure difference is the outlet pressure of the expansion valve minus the inlet pressure of the expansion valve, that is, 1.45MPa-1.5MPa=-0.05MPa.

[0104] Next, determine whether there is too little or too much refrigerant. First, the temperature at the outlet of the expansion valve, -7°C, is greater than the maximum value of the target temperature range (-10°C to -8°C), and the pressure of 1.45MPa exceeds the target range (maximum value of 1.2MPa to 1.4MPa). Assuming that the maximum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve is 1°C, and the maximum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve is 0.03Mpa, at this time, the second temperature difference (2°C) is greater than the maximum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve (1°C). At the same time, the second pressure difference of 0.05Mpa is greater than the maximum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve (0.03Mpa), indicating that there is too little refrigerant in the air conditioner, so the refrigerant controller is required to add refrigerant to the refrigerant storage.

[0105] Preferably, if the air conditioner is in heating mode, Figure 4 As shown, Figure 4In order to determine the flow of refrigerant in the refrigeration system of the air conditioner during a refrigeration cycle, in step S4, the order of the compressor, evaporator, expansion valve and condenser is used to determine whether there is too much or too little refrigerant in the refrigerant storage according to one or more of the target temperature range, target pressure range and target object shape.

[0106] Since the refrigeration cycle and heating cycle of the air conditioning system need to interchange working modes, in the cooling mode, the condenser is responsible for cooling the high-temperature and high-pressure refrigerant gas and releasing heat, while the evaporator absorbs the heat in the room and evaporates the refrigerant into gas. However, in the heating mode, the heat in the outside air needs to be transferred to the room, so the operation direction of the compressor and the expansion valve will be reversed, so that the condenser originally used to cool the air becomes the evaporator used to release heat, and the evaporator originally used to absorb indoor heat is transformed into a condenser, releasing the heat heated by the compressor to achieve the purpose of heating the indoor air. Through this reversal, the air conditioner can achieve the heating function in winter through the heat pump principle.

[0107] Preferably, a certain amount of stored refrigerant is added to or extracted from the refrigerant storage according to a comparison value of one or more of the target temperature range, the target pressure range, the target object shape and the refrigerant state at the outlet of the compressor, the condenser, the expansion valve and the evaporator, satisfying the relationship:

[0108] Δm=k1·ΔT+k2·ΔP+k3·Δh+β1(ΔT) 2 +β2(ΔP) 2 +β3(Δh) 2 ;

[0109]

[0110] Wherein, Δm represents the amount of refrigerant extracted or added, k1 represents the sensitivity of the control temperature to the adjustment of the refrigerant amount, k2 represents the sensitivity of the control pressure to the adjustment of the refrigerant amount, k3 represents the sensitivity of the control object shape ratio to the adjustment of the refrigerant amount, ΔT represents the difference between the temperature at the outlet of the compressor, condenser or expansion valve and the maximum or minimum value of the target temperature range, ΔP represents the difference between the pressure at the outlet of the compressor, condenser or expansion valve and the maximum or minimum value of the target pressure range, Δh represents the difference between the ratio of gas to liquid at the outlet of the expansion valve and the maximum or minimum value of the target object shape ratio range, Indicates the ratio of gas to liquid at the outlet of the expansion valve. It represents the maximum or minimum value of the target object's morphological ratio range. β1, β2 and β3 represent the secondary effects of temperature, pressure and gas-liquid ratio on the adjustment of refrigerant stock, respectively.

[0111] Specifically, if too much or too little refrigerant is measured at the compressor or condenser, there is no need to consider Δh, Δm = k1·ΔT + k2·ΔP + β1(ΔT) 2 +β2(ΔP) 2 k1, k2, and k3 are calculated based on many years of engineering experience and the operating rules of air-conditioning and refrigeration systems. β1, β2, and β3 are obtained through multiple experiments to obtain data, and curve fitting or regression analysis is performed to find the quadratic relationship between parameters and responses. When it is measured at the expansion valve that refrigerant needs to be added, assuming k1=0.05, k2=0.8, k3=1.2, β1=0.05, β2=0.2, β3=0.3, Δh=0.05, ΔP=0.3Mpa, ΔT=2°C, then Δm=0.1+0.24+0.06+0.113=0.513kg, which means that 0.5113kg of refrigerant needs to be added to the refrigerant storage.

[0112] A system for measuring and adjusting the amount of refrigerant, the system for measuring and adjusting the amount of refrigerant is applied to the method for measuring and adjusting the amount of refrigerant as described above, the method for measuring and adjusting the amount of refrigerant is applied to an air conditioner, the air conditioner comprising a refrigerant controller, a refrigerant storage, a compressor, a condenser, an expansion valve and an evaporator, the refrigerant controller is used to add refrigerant to the refrigerant storage or to extract refrigerant from the refrigerant storage, such as Figure 2 As shown, the system for measuring and adjusting the amount of refrigerant inventory includes:

[0113] A target temperature acquisition module is used to obtain a target operating temperature value of the air conditioner;

[0114] An operating state calculation module, used for obtaining the target operating states of the compressor, condenser, expansion valve and evaporator according to the temperature value of the room where the air conditioner is located and the target operating temperature value;

[0115] A target state setting module, for obtaining a target temperature range, a target pressure range and a target object shape of the refrigerant at the outlet of the compressor, the condenser, the expansion valve and the evaporator according to a reasonable stock value of the refrigerant in the refrigerant storage device and each of the target operating states;

[0116] A refrigerant stock measurement module is used to obtain the refrigerant status at the outlets of the compressor, condenser, expansion valve and evaporator when the air conditioner adjusts the indoor temperature value, and judge whether the refrigerant in the refrigerant storage is too much or too little according to one or more of the target temperature range, target pressure range and target object shape in the order of the compressor, condenser, expansion valve and evaporator;

[0117] The state of the snow type includes one or more of the temperature, pressure and physical form of the snow type;

[0118] The refrigerant stock adjustment module is used to add or extract a certain amount of refrigerant stock into the refrigerant storage when there is too much or too little refrigerant in the refrigerant storage. The refrigerant controller adds or extracts a certain amount of refrigerant stock into the refrigerant storage according to the comparison value of one or more of the target temperature range, target pressure range, target object shape and the refrigerant state at the outlet of the compressor, condenser, expansion valve and evaporator.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0120] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for measuring and adjusting the amount of refrigerant, wherein the method for measuring the amount of refrigerant is applied to an air conditioner, wherein the air conditioner comprises a refrigerant controller, a refrigerant storage, a compressor, a condenser, an expansion valve and an evaporator, wherein the refrigerant controller is used to add refrigerant to the refrigerant storage or to extract refrigerant from the refrigerant storage, and wherein: The method for measuring the amount of refrigerant stock comprises the following steps: S1: Obtain the target operating temperature value of the air conditioner; S2: obtaining target operating states of the compressor, condenser, expansion valve and evaporator according to the temperature value of the room where the air conditioner is located and the target operating temperature value; S3: according to the reasonable stock value of the refrigerant in the refrigerant storage device and each of the target operating states, obtaining the target temperature range, target pressure range and target object shape of the refrigerant at the outlet of the compressor, the condenser, the expansion valve and the evaporator; S4: when the air conditioner adjusts the indoor temperature, the refrigerant status at the outlet of the compressor, the condenser, the expansion valve and the evaporator is obtained, and whether the refrigerant in the refrigerant storage is too much or too little according to one or more of the target temperature range, the target pressure range and the target object shape in the order of the compressor, the condenser, the expansion valve and the evaporator; The state of the snow type includes one or more of the temperature, pressure and physical form of the snow type; S5: When there is too much or too little refrigerant in the refrigerant storage, the refrigerant controller adds or extracts a certain amount of refrigerant into the refrigerant storage according to a comparison value between one or more of the target temperature range, the target pressure range, and the target object shape and the refrigerant state at the outlet of the compressor, the condenser, the expansion valve, and the evaporator.

2. The method for measuring and adjusting the refrigerant inventory according to claim 1, characterized in that: In step S4, when the air conditioner is cooling: Obtain the temperature and pressure of the refrigerant at the inlet of the compressor; Calculating a first temperature difference and a first pressure difference at the inlet and outlet of the compressor according to the temperature and pressure of the refrigerant at the inlet and outlet of the compressor; If the temperature of the refrigerant at the outlet of the compressor is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the compressor and / or the pressure of the refrigerant at the outlet of the compressor is lower than the minimum value of the target pressure range of the pressure at the outlet of the compressor, then determine whether the first temperature difference is smaller than the minimum difference between the target temperature range of the refrigerant at the outlet of the compressor and the target temperature range of the refrigerant at the inlet of the compressor and / or whether the first pressure difference is smaller than the minimum difference between the target pressure range of the refrigerant at the outlet of the compressor and the target pressure range of the refrigerant at the inlet of the compressor. If so, there is too little refrigerant in the refrigerant storage; If the temperature of the refrigerant at the outlet of the compressor is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the compressor and / or the pressure of the refrigerant at the outlet of the compressor is higher than the maximum value of the target pressure range of the pressure at the outlet of the compressor, it is determined whether the first temperature difference is greater than the maximum difference between the target temperature range of the refrigerant at the outlet of the compressor and the target temperature range of the refrigerant at the inlet of the compressor. If so, there is too much refrigerant in the refrigerant storage.

3. The method for measuring and adjusting the refrigerant inventory according to claim 1, characterized in that: In step S4, it also includes determining whether there is too much or too little refrigerant in the refrigerant storage according to the operating current of the compressor; obtaining a target operating current of the compressor according to a target operating state of the compressor; If the operating current of the compressor is less than the target operating current and the difference between the operating current and the target operating current is greater than a first threshold, then the refrigerant in the refrigerant storage is too little; If the operating current of the compressor is greater than the target operating current and the difference between the operating current and the target operating current is greater than a second threshold, then there is too much refrigerant in the refrigerant storage.

4. The method for measuring and adjusting the refrigerant inventory according to claim 1, characterized in that: In step S4, when the air conditioner is cooling: If the temperature of the refrigerant at the outlet of the condenser is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the condenser, the refrigerant in the refrigerant storage is too little; If the temperature of the refrigerant at the outlet of the condenser is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the condenser, there is too much refrigerant in the refrigerant storage.

5. The method for measuring and adjusting refrigerant inventory according to claim 1, characterized in that: In step S4, when the air conditioner is cooling: Obtaining a ratio of gas to liquid at an outlet of the expansion valve, and obtaining a target object shape ratio range according to the target object shape at the outlet of the expansion valve; If the ratio of gas to liquid at the outlet of the expansion valve is higher than the maximum value of the target object morphology ratio range, there is too little refrigerant in the refrigerant storage; If the ratio of gas to liquid at the outlet of the expansion valve is lower than the minimum value of the target object morphology ratio range, there is too much refrigerant in the refrigerant storage.

6. The method for measuring and adjusting refrigerant inventory according to claim 1, characterized in that: In step S4, when the air conditioner is cooling: Obtain the temperature and pressure of the refrigerant at the outlet of the expansion valve; Calculating a second temperature difference and a second pressure difference at the inlet and outlet of the expansion valve according to the temperature and pressure of the refrigerant at the inlet and outlet of the expansion valve; If the temperature of the refrigerant at the outlet of the expansion valve is higher than the maximum value of the target temperature range of the refrigerant at the outlet of the expansion valve and / or the pressure of the refrigerant at the outlet of the expansion valve is higher than the maximum value of the target pressure range of the pressure at the outlet of the expansion valve, then it is determined whether the second temperature difference is greater than the maximum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve and / or whether the second pressure difference is greater than the maximum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve. If so, there is too little refrigerant in the refrigerant storage; If the temperature of the refrigerant at the outlet of the expansion valve is lower than the minimum value of the target temperature range of the refrigerant at the outlet of the expansion valve and / or the pressure of the refrigerant at the outlet of the expansion valve is lower than the minimum value of the target pressure range of the pressure at the outlet of the expansion valve, then determine whether the second temperature difference is lower than the minimum difference between the target temperature range of the refrigerant at the outlet of the expansion valve and the target temperature range of the refrigerant at the inlet of the expansion valve and / or whether the second pressure difference is lower than the minimum difference between the target pressure range of the refrigerant at the outlet of the expansion valve and the target pressure range of the refrigerant at the inlet of the expansion valve. If so, there is too much refrigerant in the refrigerant storage.

7. The method for measuring and adjusting refrigerant inventory according to claim 1, characterized in that: If the air conditioner is in heating mode, in step S4, the order of the compressor, evaporator, expansion valve and condenser is used to determine whether there is too much or too little refrigerant in the refrigerant storage according to one or more of the target temperature range, target pressure range and target object shape.

8. The method for measuring and adjusting refrigerant inventory according to claim 1, characterized in that: According to the comparison value of one or more of the target temperature range, the target pressure range, the target object shape and the refrigerant state at the outlet of the compressor, the condenser, the expansion valve and the evaporator, a certain amount of refrigerant is added to or extracted from the refrigerant storage device, satisfying the relationship: Δm=k1·ΔT+k2·ΔP+k3·Δh+β1(ΔT) 2 +β2(ΔP) 2 +β3(Δh) 2 ; Wherein, Δm represents the amount of refrigerant extracted or added, k1 represents the sensitivity of the control temperature to the adjustment of the refrigerant amount, k2 represents the sensitivity of the control pressure to the adjustment of the refrigerant amount, k3 represents the sensitivity of the control object shape ratio to the adjustment of the refrigerant amount, ΔT represents the difference between the temperature at the outlet of the compressor, condenser or expansion valve and the maximum or minimum value of the target temperature range, ΔP represents the difference between the pressure at the outlet of the compressor, condenser or expansion valve and the maximum or minimum value of the target pressure range, Δh represents the difference between the ratio of gas to liquid at the outlet of the expansion valve and the maximum or minimum value of the target object shape ratio range, Indicates the ratio of gas to liquid at the outlet of the expansion valve. It represents the maximum or minimum value of the target object's morphological ratio range. β1, β2 and β3 represent the secondary effects of temperature, pressure and gas-liquid ratio on the adjustment of refrigerant stock, respectively.

9. A system for measuring and adjusting the amount of refrigerant, the system for measuring and adjusting the amount of refrigerant being applied to the method for measuring and adjusting the amount of refrigerant as claimed in any one of claims 1 to 8, the method for measuring and adjusting the amount of refrigerant being applied to an air conditioner, the air conditioner comprising a refrigerant controller, a refrigerant storage, a compressor, a condenser, an expansion valve and an evaporator, the refrigerant controller being used to add refrigerant to the refrigerant storage or to extract refrigerant from the refrigerant storage, characterized in that: The system for measuring and adjusting the refrigerant inventory includes: A target temperature acquisition module is used to obtain a target operating temperature value of the air conditioner; An operating state calculation module, used for obtaining the target operating states of the compressor, condenser, expansion valve and evaporator according to the temperature value of the room where the air conditioner is located and the target operating temperature value; A target state setting module, for obtaining a target temperature range, a target pressure range and a target object shape of the refrigerant at the outlet of the compressor, the condenser, the expansion valve and the evaporator according to a reasonable stock value of the refrigerant in the refrigerant storage device and each of the target operating states; A refrigerant stock measurement module is used to obtain the refrigerant status at the outlets of the compressor, condenser, expansion valve and evaporator when the air conditioner adjusts the indoor temperature value, and judge whether the refrigerant in the refrigerant storage is too much or too little according to one or more of the target temperature range, target pressure range and target object shape in the order of the compressor, condenser, expansion valve and evaporator; The state of the snow type includes one or more of the temperature, pressure and physical form of the snow type; The refrigerant stock adjustment module is used to add or extract a certain amount of refrigerant stock into the refrigerant storage when there is too much or too little refrigerant in the refrigerant storage. The refrigerant controller adds or extracts a certain amount of refrigerant stock into the refrigerant storage according to the comparison value of one or more of the target temperature range, target pressure range, target object shape and the refrigerant state at the outlet of the compressor, condenser, expansion valve and evaporator.

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