Refrigerant safety protection method and apparatus for air conditioning unit, and air conditioning unit

Abstract

The present application relates to the technical field of air conditioners. Provided are a refrigerant safety protection method and apparatus for an air conditioning unit, and an air conditioning unit. The refrigerant safety protection method for an air conditioning unit comprises: after an air conditioning unit is powered on to operate, acquiring an ambient temperature; acquiring a corresponding refrigerant pressure of the air conditioning unit at the ambient temperature; on the basis of the refrigerant pressure, determining whether the air conditioning unit has a refrigerant abnormality risk; and when the air conditioning unit has a refrigerant abnormality risk, controlling the air conditioning unit to execute a refrigerant safety protection strategy. By means of the present application, explosion risks caused by refrigerant abnormalities can be reduced, thereby improving the safety and reliability of an air conditioning unit.

Description

Air conditioning unit refrigerant safety protection method, device and air conditioning unit

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023117482265, filed on December 19, 2023, entitled “Air-conditioning unit refrigerant safety protection method, device and air-conditioning unit”, which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of air-conditioning technology, and in particular to a refrigerant safety protection method and device for an air-conditioning unit, and an air-conditioning unit. Background Art

[0004] In the related art, air-conditioning units generally use environmentally friendly refrigerants for cooling and heating. However, most environmentally friendly refrigerants are flammable, and the outdoor unit of the air-conditioning unit has an electronic control system, which has the risk of circuit ignition. Refrigerant leakage usually occurs in the outdoor unit or the pipe part connecting the indoor and outdoor units. Since these components are exposed to the outdoors, they are more susceptible to external environmental factors (such as extreme temperatures, corrosion and mechanical damage), resulting in abnormal leakage of refrigerant. When flammable refrigerant leaks abnormally, if it encounters a circuit ignition, it is easy to cause an explosion hazard, resulting in low safety and reliability of the air-conditioning unit. Summary of the Invention

[0005] The present application provides a refrigerant safety protection method, device and air-conditioning unit for an air-conditioning unit, which are used to solve the defect in the related art that the safety and reliability of the air-conditioning unit is low due to refrigerant abnormality, reduce the risk of explosion caused by refrigerant abnormality, and improve the safety and reliability of the air-conditioning unit.

[0006] The present application provides a refrigerant safety protection method for an air-conditioning unit, comprising:

[0007] The air conditioning unit is powered on and running to obtain the ambient temperature;

[0008] Obtaining the refrigerant pressure corresponding to the air-conditioning unit at the ambient temperature;

[0009] determining, based on the refrigerant pressure, whether the air-conditioning unit has a refrigerant abnormality risk;

[0010] In the event that there is a risk of refrigerant abnormality in the air-conditioning unit, the air-conditioning unit is controlled to execute a refrigerant safety protection strategy.

[0011] According to a refrigerant safety protection method for an air-conditioning unit provided by the present application, the step of determining whether the air-conditioning unit has a refrigerant abnormality risk based on the refrigerant pressure includes:

[0012] Determining that the refrigerant pressure is less than a lower limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determining that the air-conditioning unit has a risk of leakage due to insufficient refrigerant;

[0013] Determining that the refrigerant pressure is greater than an upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determining that the air-conditioning unit is at risk of excessive refrigerant pressure;

[0014] Determining that the refrigerant pressure is greater than or equal to a lower limit of the refrigerant saturation pressure corresponding to the ambient temperature and less than or equal to an upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, determines that the refrigerant of the air-conditioning unit is normal.

[0015] According to the present application, a refrigerant safety protection method for an air-conditioning unit further includes:

[0016] It is determined that the refrigerant pressure is greater than the refrigerant saturation pressure upper limit corresponding to the ambient temperature for a duration reaching a preset duration, and it is determined that there is a risk of excessive refrigerant leakage in the air-conditioning unit.

[0017] According to a refrigerant safety protection method for an air-conditioning unit provided by the present application, the step of controlling the air-conditioning unit to execute a refrigerant safety protection strategy when there is a risk of refrigerant anomaly in the air-conditioning unit includes:

[0018] When it is determined that the air conditioning unit has a risk of leakage due to insufficient refrigerant, controlling the speed of the outdoor fan of the air conditioning unit according to the refrigerant pressure of the air conditioning unit;

[0019] When it is determined that the air-conditioning unit has a risk of excessive refrigerant pressure, the opening of the electronic expansion valve of the air-conditioning unit is controlled according to the refrigerant pressure of the air-conditioning unit.

[0020] According to a refrigerant safety protection method for an air-conditioning unit provided by the present application, the step of controlling the speed of the outdoor fan of the air-conditioning unit according to the refrigerant pressure of the air-conditioning unit includes:

[0021] Determining that the refrigerant pressure of the air-conditioning unit reaches a first preset pressure, and controlling the speed of the outdoor fan of the air-conditioning unit to be the first preset speed;

[0022] Determining that the refrigerant pressure of the air-conditioning unit reaches a second preset pressure, and controlling the speed of the outdoor fan of the air-conditioning unit to be the second preset speed;

[0023] Determining that the refrigerant pressure of the air-conditioning unit reaches a third preset pressure, and controlling the speed of the outdoor fan of the air-conditioning unit to be a third preset speed;

[0024] The first preset pressure is greater than the second preset pressure, and the second preset pressure is greater than the third preset pressure; the first preset speed is less than the second preset speed, and the second preset speed is less than the third preset speed.

[0025] According to a refrigerant safety protection method for an air-conditioning unit provided by the present application, the step of controlling the opening of the electronic expansion valve of the air-conditioning unit according to the refrigerant pressure of the air-conditioning unit includes:

[0026] Determining that the refrigerant pressure of the air-conditioning unit reaches a fourth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a first preset opening;

[0027] Determining that the refrigerant pressure of the air-conditioning unit reaches a fifth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a second preset opening;

[0028] determining that the refrigerant pressure of the air-conditioning unit reaches a sixth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a third preset opening;

[0029] The fourth preset pressure is smaller than the fifth preset pressure, and the fifth preset pressure is smaller than the sixth preset pressure; the first preset opening is larger than the second preset opening, and the second preset opening is larger than the third preset opening.

[0030] According to a refrigerant safety protection method for an air-conditioning unit provided by the present application, the step of controlling the air-conditioning unit to execute a refrigerant safety protection strategy when there is a risk of refrigerant anomaly in the air-conditioning unit further includes:

[0031] When it is determined that the air-conditioning unit has a risk of leakage due to insufficient refrigerant, controlling the air-conditioning unit to issue a first warning prompt message;

[0032] When it is determined that the air-conditioning unit is at risk of excessive refrigerant pressure, the air-conditioning unit is controlled to issue a second warning prompt message.

[0033] According to a refrigerant safety protection method for an air-conditioning unit provided by the present application, before the step of powering on the air-conditioning unit, the method further includes:

[0034] The outdoor fan of the air-conditioning unit is controlled to run intermittently at a preset cycle.

[0035] The present application also provides a refrigerant safety protection device for an air-conditioning unit, comprising:

[0036] The first acquisition module is used to obtain the ambient temperature when the air-conditioning unit is powered on;

[0037] A second acquisition module is used to obtain the refrigerant pressure of the air-conditioning unit corresponding to the ambient temperature;

[0038] a determination module, configured to determine whether the air-conditioning unit has a refrigerant abnormality risk based on the refrigerant pressure;

[0039] The control module is used to control the air-conditioning unit to execute a refrigerant safety protection strategy when there is a risk of refrigerant abnormality in the air-conditioning unit.

[0040] The present application also provides an air-conditioning unit, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the refrigerant safety protection method for the air-conditioning unit as described above is implemented.

[0041] The air-conditioning unit refrigerant safety protection method, device and air-conditioning unit provided in the present application obtain the ambient temperature and the refrigerant pressure corresponding to the ambient temperature of the air-conditioning unit by powering on the air-conditioning unit. According to the refrigerant pressure, it is determined whether the air-conditioning unit has a refrigerant abnormality risk. In the case that the air-conditioning unit has a refrigerant abnormality risk, the air-conditioning unit is controlled to execute the refrigerant safety protection strategy, which can reduce the explosion risk caused by the refrigerant abnormality and improve the safety and reliability of the air-conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] FIG1 is a flow chart of a refrigerant safety protection method for an air-conditioning unit provided in the present application;

[0044] FIG2 is a second flow chart of the refrigerant safety protection method for air-conditioning units provided in this application;

[0045] FIG3 is a schematic structural diagram of the refrigerant safety protection device for an air-conditioning unit provided in the present application; and

[0046] FIG4 is a schematic structural diagram of the air-conditioning unit provided in this application.

[0047] Reference numerals: 301: first acquisition module; 302: second acquisition module; 303: determination module; 304: control module; 401: processor; 402: communication interface; 403: memory; 404: communication bus. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0049] In the description of the embodiments of the present application, it should be noted that the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0051] The following describes the refrigerant safety protection method, device and air-conditioning unit of the present application with reference to Figures 1 to 4.

[0052] According to an embodiment of the first aspect of the present application, as shown in FIG1 , the refrigerant safety protection method for an air-conditioning unit provided in the present application mainly includes the following steps.

[0053] S101: The air conditioning unit is powered on and operates to obtain the ambient temperature.

[0054] S102: Obtain the refrigerant pressure corresponding to the ambient temperature of the air-conditioning unit.

[0055] S103. Determine whether the air-conditioning unit has a refrigerant abnormality risk based on the refrigerant pressure.

[0056] S104: When there is a risk of refrigerant abnormality in the air-conditioning unit, control the air-conditioning unit to execute a refrigerant safety protection strategy.

[0057] Specifically, when the air-conditioning unit is running, it detects the current ambient temperature in real time through a temperature sensor, and detects the corresponding refrigerant pressure in the current environment in real time through a pressure sensor. Then, it determines whether there is a refrigerant leak or other abnormal conditions in the air-conditioning unit based on the detected refrigerant pressure analysis. When an abnormal risk of refrigerant is detected, the air-conditioning unit automatically starts the preset safety protection strategy to achieve protection.

[0058] Therefore, the refrigerant safety protection method for the air-conditioning unit provided in the embodiment of the present application can effectively identify and respond to refrigerant abnormalities by real-time detection of ambient temperature and refrigerant pressure, thereby reducing the risk of explosion caused by refrigerant abnormalities and improving the safety and reliability of the air-conditioning unit.

[0059] According to one embodiment of the present application, the step of determining whether an air conditioning unit has a refrigerant abnormality risk based on the refrigerant pressure includes:

[0060] Determine that the refrigerant pressure is less than the lower limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determine that the air conditioning unit has a risk of refrigerant leakage;

[0061] Determine that the refrigerant pressure is greater than the upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determine that the air conditioning unit is at risk of excessive refrigerant pressure;

[0062] Determine that the refrigerant pressure is greater than or equal to the lower limit of the refrigerant saturation pressure corresponding to the ambient temperature and less than or equal to the upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determine that the refrigerant of the air-conditioning unit is normal.

[0063] Specifically, when the detected refrigerant pressure is lower than the lower limit of the refrigerant saturation pressure corresponding to the ambient temperature, in this case, it means that the refrigerant pressure is lower than the minimum pressure level that should be reached during normal operation, indicating that the amount of refrigerant in the unit is insufficient and there is a leakage problem.

[0064] When the detected refrigerant pressure exceeds the upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, it indicates that the unit may have an abnormal refrigerant overcharge. When there is too much refrigerant, there will be high pressure when the unit is running, resulting in the risk of pressure in the unit's refrigerant pipeline.

[0065] When the detected refrigerant pressure is between the lower and upper limits of the refrigerant saturation pressure corresponding to the ambient temperature, it can usually be considered that the refrigerant quantity of the unit is normal. At this time, the air-conditioning unit can operate normally without taking special safety precautions.

[0066] It can be understood that the saturation pressure of a refrigerant refers to the pressure at a certain temperature when the refrigerant is in a state of equilibrium between liquid and gas. This means that at this pressure, the refrigerant can be either liquid or gas, and the two states of refrigerant can transform into each other to achieve dynamic equilibrium.

[0067] In addition, the relationship between the saturation pressure of the refrigerant and the ambient temperature can be checked through a saturation pressure-ambient temperature comparison table. This table usually gives the saturation pressure values ​​of different refrigerants (such as R290, etc.) at different ambient temperatures.

[0068] Therefore, the embodiment of the present application can determine whether the air-conditioning unit has a refrigerant abnormality risk based on the refrigerant pressure, and take corresponding treatment measures accordingly to ensure the safe and reliable operation of the air-conditioning unit.

[0069] According to one embodiment of the present application, the refrigerant safety protection method for an air-conditioning unit of the present application further includes:

[0070] It is determined that the refrigerant pressure is greater than the upper limit of the refrigerant saturation pressure corresponding to the ambient temperature for a duration that reaches a preset duration, and it is determined that there is a risk of excessive refrigerant leakage in the air-conditioning unit.

[0071] Specifically, when the detected refrigerant pressure is greater than the upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, it means that the refrigerant pressure in the unit is too high, which may be caused by an excess of refrigerant. The high pressure may cause the refrigerant pipeline to be under excessive pressure. If the refrigerant pressure continues to exceed the upper limit of the refrigerant saturation pressure for a period longer than the preset threshold (for example, several hours or days), it may cause pipeline rupture and seal failure in the long run, thereby causing refrigerant leakage, indicating that the unit may be at risk of excessive refrigerant leakage.

[0072] Therefore, the embodiment of the present application can more accurately identify the risk of excessive refrigerant based on a comprehensive judgment of refrigerant pressure and duration, so as to take timely countermeasures to ensure the safe and reliable operation of the air-conditioning system.

[0073] According to one embodiment of the present application, when there is a risk of refrigerant anomaly in the air-conditioning unit, the steps of controlling the air-conditioning unit to execute the refrigerant safety protection strategy include:

[0074] If it is determined that the air conditioning unit has a risk of leakage due to insufficient refrigerant, the outdoor fan speed of the air conditioning unit is controlled according to the refrigerant pressure of the air conditioning unit;

[0075] When it is determined that the air-conditioning unit is at risk of excessive refrigerant pressure, the opening of the electronic expansion valve of the air-conditioning unit is controlled according to the refrigerant pressure of the air-conditioning unit.

[0076] Specifically, when an air conditioning unit is at risk of leaking too little refrigerant, the refrigerant will continue to accumulate inside the unit's outdoor unit. If this accumulation is not adequately dispersed, it can create a risk of explosion. In this case, the outdoor fan can be turned on to accelerate gas exchange from the outdoor unit to the external environment, allowing the refrigerant to escape from the unit, reducing the refrigerant concentration and, therefore, the risk of explosion. To ensure safety, the outdoor fan's motor uses an external drive and has an IP55 protection rating, ensuring excellent dust and water resistance, allowing it to operate stably in harsh environments.

[0077] When the air conditioning unit is at risk of excessive refrigerant pressure, the pressure in the refrigerant pipeline is high. By reducing the opening of the electronic expansion valve, the pressure of the unit can be reduced, preventing potential problems and dangers caused by high pressure.

[0078] Therefore, the embodiments of the present application can take corresponding protective measures for different types of refrigerant abnormality risks to ensure the safe and reliable operation of the air-conditioning unit.

[0079] According to one embodiment of the present application, when it is determined that there is a risk of leakage of too little refrigerant in the air conditioning unit, the step of controlling the speed of the outdoor fan of the air conditioning unit according to the refrigerant pressure of the air conditioning unit includes:

[0080] If it is determined that the air conditioning unit has a risk of leakage due to insufficient refrigerant:

[0081] Determining that the refrigerant pressure of the air-conditioning unit reaches a first preset pressure, and controlling the outdoor fan speed of the air-conditioning unit to be the first preset speed;

[0082] Determining that the refrigerant pressure of the air-conditioning unit reaches a second preset pressure, and controlling the outdoor fan speed of the air-conditioning unit to be the second preset speed;

[0083] Determining that the refrigerant pressure of the air-conditioning unit reaches a third preset pressure, and controlling the outdoor fan speed of the air-conditioning unit to be a third preset speed;

[0084] The first preset pressure is greater than the second preset pressure, and the second preset pressure is greater than the third preset pressure; the first preset speed is less than the second preset speed, and the second preset speed is less than the third preset speed.

[0085] Specifically, when it is detected that there is a risk of leakage of too little refrigerant in the air-conditioning unit, the present application sets three different preset pressure levels: the first preset pressure, the second preset pressure and the third preset pressure, and there is a decreasing relationship between them (i.e., the first preset pressure is the largest and the third preset pressure is the smallest).

[0086] When the refrigerant pressure in the air conditioning unit reaches a first preset pressure, the outdoor fan is controlled to operate at a first preset speed. At this point, since the refrigerant pressure is relatively high, indicating a relatively large amount of refrigerant and a minor refrigerant leak, the fan speed can be appropriately reduced, thereby reducing refrigerant concentration and energy consumption.

[0087] When the refrigerant pressure drops to the second preset pressure, it indicates that the refrigerant leakage is at a medium level. At this time, the outdoor fan speed is increased to the second preset speed to quickly reduce the refrigerant concentration. In order to compensate for the decrease in cooling capacity due to refrigerant loss, the heat exchange efficiency is improved by increasing the air flow.

[0088] When the refrigerant pressure drops further to a third preset pressure, indicating a severe refrigerant leak, the outdoor fan speed is increased to the third preset speed to rapidly reduce the refrigerant concentration. This strategy helps maximize air flow in severe refrigerant shortages, maintaining a consistent cooling effect.

[0089] Therefore, the preset speed of the outdoor fan of the present application is inversely proportional to the preset pressure, that is, as the refrigerant pressure decreases, the fan speed gradually increases. On the one hand, it can achieve precise matching of the refrigerant leakage level and the fan speed, ensuring that the refrigerant concentration at different refrigerant leakage levels is as low as possible, thereby reducing the risk of explosion. On the other hand, it can ensure the heat exchange efficiency as much as possible to deal with the performance degradation problem that may occur in the air-conditioning unit when there is a risk of refrigerant leakage.

[0090] According to one embodiment of the present application, when it is determined that the air conditioning unit is at risk of excessive refrigerant pressure, the step of controlling the opening of the electronic expansion valve of the air conditioning unit according to the refrigerant pressure of the air conditioning unit includes:

[0091] If it is determined that the air conditioning unit is at risk of excessive refrigerant pressure:

[0092] Determining that the refrigerant pressure of the air-conditioning unit reaches a fourth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a first preset opening;

[0093] Determining that the refrigerant pressure of the air-conditioning unit reaches a fifth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a second preset opening;

[0094] Determining that the refrigerant pressure of the air-conditioning unit reaches a sixth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a third preset opening;

[0095] The fourth preset pressure is smaller than the fifth preset pressure, and the fifth preset pressure is smaller than the sixth preset pressure; the first preset opening is larger than the second preset opening, and the second preset opening is larger than the third preset opening.

[0096] Specifically, when it is detected that the air-conditioning unit is at risk of excessive refrigerant pressure, the present application sets three different preset pressure levels: the fourth preset pressure, the fifth preset pressure and the sixth preset pressure, and there is an increasing relationship between them (i.e., the fourth preset pressure is the minimum and the sixth preset pressure is the maximum).

[0097] When the refrigerant pressure of the air-conditioning unit reaches the fourth preset pressure, it indicates that the refrigerant pressure is at a light level, and at this time the opening of the electronic expansion valve is controlled to be the first preset opening.

[0098] When the refrigerant pressure rises to the fifth preset pressure, it indicates that the refrigerant pressure is at a medium level. At this time, the opening of the electronic expansion valve is reduced to the second preset opening, thereby reducing the unit pressure and preventing excessive pressure caused by excessive refrigerant.

[0099] If the refrigerant pressure further increases to the sixth preset pressure, indicating a critical refrigerant pressure level, the electronic expansion valve opening is further reduced to the third preset opening. This strategy helps reduce refrigerant flow in severe refrigerant overload situations, thereby preventing damage to the unit caused by excessive pressure.

[0100] Therefore, the preset opening of the electronic expansion valve of this application is inversely proportional to the preset pressure, that is, as the refrigerant pressure increases, the expansion valve opening gradually decreases. This is because when there is too much refrigerant and the pressure increases, the refrigerant flow rate needs to be reduced to maintain the normal cooling process and prevent the pressure from being too high.

[0101] According to one embodiment of the present application, when there is a risk of refrigerant anomaly in the air-conditioning unit, the step of controlling the air-conditioning unit to execute the refrigerant safety protection strategy further includes:

[0102] When it is determined that the air-conditioning unit has a risk of leakage due to insufficient refrigerant, the air-conditioning unit is controlled to issue a first warning prompt message;

[0103] When it is determined that the air-conditioning unit is at risk of being over-pressurized by the refrigerant, the air-conditioning unit is controlled to issue a second warning prompt message.

[0104] Specifically, when there is a risk of refrigerant leakage in the air-conditioning unit, the refrigerant can be quickly dispersed by controlling the outdoor fan, reducing the concentration of the refrigerant to achieve preliminary protection. The air-conditioning unit will also display the fault code corresponding to the leakage risk, or directly send the leakage risk prompt information to the user terminal to prompt maintenance in time.

[0105] When the air-conditioning unit is at risk of excessive refrigerant pressure, the unit pressure can be reduced as much as possible by controlling the opening of the electronic expansion valve, achieving a preliminary protective effect. The air-conditioning unit will display the fault code corresponding to the pressure risk, or directly send the pressure risk prompt information to the user terminal to prompt maintenance in time.

[0106] Therefore, after taking certain safety protection measures, the method of the embodiment of the present application can issue corresponding warning prompt information according to different risks, so as to facilitate the user to perform timely targeted maintenance, thereby effectively improving the safe operation of the unit and the user experience.

[0107] According to an embodiment of the present application, before the step of powering on and operating the air conditioner unit, it further includes:

[0108] Controlling the outdoor fan of the air conditioner unit to operate intermittently at a preset period.

[0109] Specifically, before the compressor of the air conditioner unit is powered on and operates, the outdoor fan is started to operate. Even if there is a phenomenon of refrigerant leakage and accumulation before starting, the refrigerant can be blown away in advance by starting the fan in advance, thus ensuring the safety during the operation of the unit; and by controlling the outdoor fan to operate for a certain period of time at regular intervals, the purpose of energy saving and noise reduction can be achieved.

[0110] The following further describes the refrigerant safety protection method of the air conditioner unit provided by the present application with specific examples. As shown in Figure 2, it mainly includes the following steps.

[0111] (1) The air conditioner unit is powered on and operates, and the ambient temperature and the corresponding refrigerant pressure Pdm are detected.

[0112] (2) Look up the table to obtain the lower limit value Pd-Δd and the upper limit value Pd+Δd of the refrigerant saturation pressure corresponding to the ambient temperature. Pd is the refrigerant saturation pressure, and Δd is the parameter margin fixed value, which can be adjusted and designed according to the actual working conditions.

[0113] (3) Compare the detected refrigerant pressure Pdm with the lower limit value Pd-Δd and the upper limit value Pd+Δd of the refrigerant saturation pressure obtained by looking up the table, and judge whether the refrigerant pressure Pdm is less than the lower limit value Pd-Δd of the refrigerant saturation pressure.

[0114] (4) If Pdm<Pd-Δd, the air conditioner unit has a risk of refrigerant leakage due to too little refrigerant. At this time, control the outdoor fan to operate to reduce the concentration of the leaked refrigerant, and the unit displays the corresponding fault code to give a warning prompt for maintenance.

[0115] (5) If not, continue to judge whether the refrigerant pressure Pdm is greater than the upper limit value Pd+Δd of the refrigerant saturation pressure.

[0116] (6) If Pdm>Pd+Δd, the air conditioner unit has a risk of excessive pressure due to too much refrigerant. There is a problem of too much refrigerant in the unit. At this time, control the opening degree of the electronic expansion valve to reduce the pressure, and the unit displays the corresponding fault code to give a warning prompt for maintenance.

[0117] (7) If not, then Pd-Δd≤Pdm≤Pd+Δd, the refrigerant of the air-conditioning unit is normal, the unit operates normally, and the outdoor fan is running before starting up.

[0118] The following continues to describe the refrigerant safety protection device for the air-conditioning unit provided in the present application. The refrigerant safety protection device for the air-conditioning unit described below and the refrigerant safety protection method for the air-conditioning unit described above can be referenced to each other.

[0119] According to an embodiment of the second aspect of the present application, as shown in FIG3 , the present application further provides a refrigerant safety protection device for an air-conditioning unit, which mainly includes: a first acquisition module 301, a second acquisition module 302, a determination module 303, and a control module 304. The first acquisition module 301 is used to obtain the ambient temperature when the air-conditioning unit is powered on; the second acquisition module 302 is used to obtain the refrigerant pressure corresponding to the ambient temperature of the air-conditioning unit; the determination module 303 is used to determine whether the air-conditioning unit has a refrigerant anomaly risk based on the refrigerant pressure; and the control module 304 is used to control the air-conditioning unit to execute a refrigerant safety protection strategy if the air-conditioning unit has a refrigerant anomaly risk.

[0120] The refrigerant safety protection device for an air-conditioning unit provided in the embodiment of the present application can reduce the risk of explosion due to refrigerant anomalies and improve the safety and reliability of the air-conditioning unit.

[0121] According to an embodiment of the third aspect of the present application, as shown in FIG4 , the present application further provides an air-conditioning unit, which may include: a processor 401, a communications interface 402, a memory 403, and a communication bus 404, wherein the processor 401, the communications interface 402, and the memory 403 communicate with each other via the communication bus 404. The processor 401 may call the logic instructions in the memory 403 to execute a refrigerant safety protection method for the air-conditioning unit, the method comprising: powering on the air-conditioning unit to obtain the ambient temperature; obtaining the refrigerant pressure corresponding to the air-conditioning unit at the ambient temperature; determining whether the air-conditioning unit has a refrigerant abnormality risk based on the refrigerant pressure; and controlling the air-conditioning unit to execute a refrigerant safety protection strategy when the air-conditioning unit has a refrigerant abnormality risk.

[0122] In addition, the logic instructions in the above-mentioned memory 403 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0123] On the other hand, the present application also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the air-conditioning unit refrigerant safety protection method provided by the above methods. The method includes: the air-conditioning unit is powered on and the ambient temperature is obtained; the refrigerant pressure corresponding to the air-conditioning unit at the ambient temperature is obtained; based on the refrigerant pressure, it is determined whether the air-conditioning unit has a refrigerant abnormality risk; and when the air-conditioning unit has a refrigerant abnormality risk, the air-conditioning unit is controlled to execute the refrigerant safety protection strategy.

[0124] On the other hand, the present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the refrigerant safety protection method for the air-conditioning unit provided by the above-mentioned methods. The method includes: powering on the air-conditioning unit to obtain the ambient temperature; obtaining the refrigerant pressure corresponding to the air-conditioning unit at the ambient temperature; judging whether the air-conditioning unit has a refrigerant abnormality risk based on the refrigerant pressure; and controlling the air-conditioning unit to execute the refrigerant safety protection strategy when there is a refrigerant abnormality risk in the air-conditioning unit.

[0125] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0126] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A refrigerant safety protection method for an air conditioning unit, comprising: The air conditioning unit is powered on and running to obtain the ambient temperature; Obtaining the refrigerant pressure corresponding to the air-conditioning unit at the ambient temperature; Determining whether the air conditioning unit has a risk of abnormal refrigerant according to the refrigerant pressure; In the event that there is a risk of refrigerant abnormality in the air-conditioning unit, the air-conditioning unit is controlled to execute a refrigerant safety protection strategy.

2. The refrigerant safety protection method for an air conditioning unit according to claim 1, wherein: The determining, according to the refrigerant pressure, whether the air-conditioning unit has a refrigerant abnormality risk includes: Determining that the refrigerant pressure is less than a lower limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determining that the air-conditioning unit has a risk of leakage due to insufficient refrigerant; Determining that the refrigerant pressure is greater than the upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determining that the air-conditioning unit has a risk of excessive refrigerant pressure; Determine that the refrigerant pressure is greater than or equal to a lower limit of the refrigerant saturation pressure corresponding to the ambient temperature and less than or equal to an upper limit of the refrigerant saturation pressure corresponding to the ambient temperature, and determine that the refrigerant of the air-conditioning unit is normal.

3. The refrigerant safety protection method for an air conditioning unit according to claim 2, further comprising: It is determined that the duration for which the refrigerant pressure is greater than the upper limit value of the refrigerant saturation pressure corresponding to the ambient temperature reaches a preset duration, and it is determined that there is a risk of excessive refrigerant leakage in the air-conditioning unit.

4. The refrigerant safety protection method for an air conditioning unit according to claim 2, wherein: When the air-conditioning unit has a risk of abnormal refrigerant, controlling the air-conditioning unit to execute a refrigerant safety protection strategy includes: When it is determined that the air-conditioning unit has a risk of leakage due to insufficient refrigerant, controlling the speed of the outdoor fan of the air-conditioning unit according to the refrigerant pressure of the air-conditioning unit; When it is determined that the air-conditioning unit is at risk of being subjected to excessive refrigerant pressure, the opening of the electronic expansion valve of the air-conditioning unit is controlled according to the refrigerant pressure of the air-conditioning unit.

5. The refrigerant safety protection method for an air conditioning unit according to claim 4, wherein: The step of controlling the outdoor fan speed of the air-conditioning unit according to the refrigerant pressure of the air-conditioning unit comprises: Determining that the refrigerant pressure of the air-conditioning unit reaches a first preset pressure, and controlling the speed of the outdoor fan of the air-conditioning unit to be a first preset speed; Determining that the refrigerant pressure of the air-conditioning unit reaches a second preset pressure, and controlling the speed of the outdoor fan of the air-conditioning unit to be a second preset speed; Determining that the refrigerant pressure of the air-conditioning unit reaches a third preset pressure, and controlling the outdoor fan speed of the air-conditioning unit to be a third preset speed; Among them, the first preset pressure is greater than the second preset pressure, and the second preset pressure is greater than the third preset pressure; the first preset speed is less than the second preset speed, and the second preset speed is less than the third preset speed.

6. The refrigerant safety protection method for an air conditioning unit according to claim 4, wherein: The step of controlling the opening of the electronic expansion valve of the air-conditioning unit according to the refrigerant pressure of the air-conditioning unit comprises: Determining that the refrigerant pressure of the air-conditioning unit reaches a fourth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a first preset opening; Determining that the refrigerant pressure of the air-conditioning unit reaches a fifth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a second preset opening; Determining that the refrigerant pressure of the air-conditioning unit reaches a sixth preset pressure, and controlling the opening of the electronic expansion valve of the air-conditioning unit to be a third preset opening; Among them, the fourth preset pressure is smaller than the fifth preset pressure, and the fifth preset pressure is smaller than the sixth preset pressure; the first preset opening is larger than the second preset opening, and the second preset opening is larger than the third preset opening.

7. The refrigerant safety protection method for an air conditioning unit according to claim 4, wherein: When the air-conditioning unit has a risk of abnormal refrigerant, controlling the air-conditioning unit to execute a refrigerant safety protection strategy also includes: When it is determined that the air-conditioning unit has a risk of leakage due to insufficient refrigerant, controlling the air-conditioning unit to issue a first warning prompt message; When it is determined that the air-conditioning unit is at risk of being over-pressurized by the refrigerant, the air-conditioning unit is controlled to issue a second warning prompt message.

8. The refrigerant safety protection method for an air-conditioning unit according to any one of claims 1 to 7, wherein: Before the step of powering on the air conditioning unit, the method further includes: The outdoor fan of the air conditioning unit is controlled to run intermittently at a preset cycle.

9. A refrigerant safety protection device for an air conditioning unit, comprising: The first acquisition module is used to power on the air-conditioning unit and acquire the ambient temperature; A second acquisition module is used to obtain the refrigerant pressure of the air-conditioning unit corresponding to the ambient temperature; A determination module, used for determining whether the air-conditioning unit has a risk of abnormal refrigerant according to the refrigerant pressure; The control module is used to control the air-conditioning unit to execute a refrigerant safety protection strategy when there is a risk of refrigerant abnormality in the air-conditioning unit.

10. An air conditioning unit, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the air-conditioning unit refrigerant safety protection method according to any one of claims 1-8 is implemented.

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