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

Abstract

The invention relates to the technical field of air conditioners, and provides an air conditioning unit refrigerant safety protection method and device and an air conditioning unit. The air conditioning unit refrigerant safety protection method comprises the steps that the air conditioning unit is powered on to operate, and the environment temperature is obtained; the corresponding refrigerant pressure of the air conditioning unit at the environment temperature is obtained; according to the refrigerant pressure, whether the air conditioning unit has a refrigerant abnormal risk or not is judged; and under the condition that the refrigerant abnormal risk exists in the air conditioning unit, the air conditioning unit is controlled to execute a refrigerant safety protection strategy. The explosion risk caused by the abnormal refrigerant can be reduced, and the safety and reliability of the air conditioning unit are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a refrigerant safety protection method, device and air conditioner unit for an air conditioner unit. Background Art

[0002] In the related art, air conditioner units generally use environmentally friendly refrigerants for refrigeration and heating. However, most environmentally friendly refrigerants are flammable, and the outdoor unit of the air conditioner unit has an electric control system, and there is a risk of electric circuit ignition in the electric control system. Since refrigerant leakage usually occurs in the outdoor unit or the pipeline part connecting the indoor and outdoor units, these components are exposed outdoors and are more vulnerable to the influence of external environmental factors (such as extreme temperature, corrosion and mechanical damage), resulting in abnormal refrigerant leakage. When the flammable refrigerant leaks abnormally, if it encounters an electric circuit ignition, it is easy to cause an explosion hazard, and the safety and reliability of the air conditioner unit are low. Summary of the Invention

[0003] The present invention provides a refrigerant safety protection method, device and air conditioner unit for an air conditioner unit, which can solve the defect of low safety and reliability of the air conditioner unit due to abnormal refrigerant in the related art, reduce the explosion risk caused by abnormal refrigerant, and improve the safety and reliability of the air conditioner unit.

[0004] The present invention provides a refrigerant safety protection method for an air conditioner unit, including:

[0005] The air conditioner unit is powered on and operated, and the ambient temperature is obtained;

[0006] The refrigerant pressure corresponding to the air conditioner unit at the ambient temperature is obtained;

[0007] According to the refrigerant pressure, it is determined whether the air conditioner unit has a risk of abnormal refrigerant;

[0008] In the case where the air conditioner unit has a risk of abnormal refrigerant, the air conditioner unit is controlled to execute a refrigerant safety protection strategy.

[0009] According to the refrigerant safety protection method for an air conditioner unit provided by the present invention, the step of determining whether the air conditioner unit has a risk of abnormal refrigerant according to the refrigerant pressure includes:

[0010] It is determined that the refrigerant pressure is less than the lower limit value of the refrigerant saturation pressure corresponding to the ambient temperature, and it is determined that the air conditioner unit has a risk of refrigerant leakage due to insufficient refrigerant;

[0011] It is determined that the refrigerant pressure is greater than the upper limit value of the refrigerant saturation pressure corresponding to the ambient temperature, and it is determined that the air conditioner unit has a risk of excessive pressure due to excessive refrigerant;

[0012] Determine that the refrigerant pressure is greater than or equal to the lower limit value of the refrigerant saturation pressure corresponding to the ambient temperature and less than or equal to the upper limit value of the refrigerant saturation pressure corresponding to the ambient temperature, and determine that the refrigerant of the air conditioner unit is normal.

[0013] According to a refrigerant safety protection method for an air conditioner unit provided by the present invention, it further includes:

[0014] Determine that the continuous 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 determine that there is a risk of excessive refrigerant leakage in the air conditioner unit.

[0015] According to a refrigerant safety protection method for an air conditioner unit provided by the present invention, the step of controlling the air conditioner unit to execute a refrigerant safety protection strategy in the case where there is a risk of abnormal refrigerant in the air conditioner unit includes:

[0016] In the case of determining that there is a risk of insufficient refrigerant leakage in the air conditioner unit, control the outdoor fan speed of the air conditioner unit according to the refrigerant pressure of the air conditioner unit;

[0017] In the case of determining that there is a risk of excessive refrigerant pressure in the air conditioner unit, control the opening degree of the electronic expansion valve of the air conditioner unit according to the refrigerant pressure of the air conditioner unit.

[0018] According to a refrigerant safety protection method for an air conditioner unit provided by the present invention, the step of controlling the outdoor fan speed of the air conditioner unit according to the refrigerant pressure of the air conditioner unit includes:

[0019] Determine that the refrigerant pressure of the air conditioner unit reaches a first preset pressure, and control the outdoor fan speed of the air conditioner unit to be a first preset speed;

[0020] Determine that the refrigerant pressure of the air conditioner unit reaches a second preset pressure, and control the outdoor fan speed of the air conditioner unit to be a second preset speed;

[0021] Determine that the refrigerant pressure of the air conditioner unit reaches a third preset pressure, and control the outdoor fan speed of the air conditioner unit to be a third preset speed;

[0022] Wherein, 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.

[0023] According to a refrigerant safety protection method for an air conditioner unit provided by the present invention, the step of controlling the opening degree of the electronic expansion valve of the air conditioner unit according to the refrigerant pressure of the air conditioner unit includes:

[0024] Determine that the refrigerant pressure of the air conditioner unit reaches the fourth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be the first preset opening degree;

[0025] Determine that the refrigerant pressure of the air conditioner unit reaches the fifth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be the second preset opening degree;

[0026] Determine that the refrigerant pressure of the air conditioner unit reaches the sixth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be the third preset opening degree;

[0027] Wherein, the fourth preset pressure is less than the fifth preset pressure, and the fifth preset pressure is less than the sixth preset pressure; the first preset opening degree is greater than the second preset opening degree, and the second preset opening degree is greater than the third preset opening degree.

[0028] According to a refrigerant safety protection method for an air conditioner unit provided by the present invention, the step of controlling the air conditioner unit to execute a refrigerant safety protection strategy in the case where there is a risk of abnormal refrigerant in the air conditioner unit further includes:

[0029] In the case of determining that there is a risk of refrigerant leakage due to too little refrigerant in the air conditioner unit, control the air conditioner unit to send out a first warning prompt message;

[0030] In the case of determining that there is a risk of excessive pressure bearing due to too much refrigerant in the air conditioner unit, control the air conditioner unit to send out a second warning prompt message.

[0031] According to a refrigerant safety protection method for an air conditioner unit provided by the present invention, before the step of powering on and operating the air conditioner unit, it further includes:

[0032] Control the outdoor fan of the air conditioner unit to run intermittently at a preset period.

[0033] The present invention also provides a refrigerant safety protection device for an air conditioner unit, including:

[0034] A first acquisition module, used for powering on and operating the air conditioner unit to acquire the ambient temperature;

[0035] A second acquisition module, used for acquiring the refrigerant pressure corresponding to the air conditioner unit at the ambient temperature;

[0036] A determination module, used for determining whether there is a risk of abnormal refrigerant in the air conditioner unit according to the refrigerant pressure;

[0037] A control module, used for controlling the air conditioner unit to execute a refrigerant safety protection strategy in the case where there is a risk of abnormal refrigerant in the air conditioner unit.

[0038] The present invention also provides an air conditioner unit, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the refrigerant safety protection method of the air conditioner unit as described above is implemented.

[0039] The refrigerant safety protection method, device, and air conditioner unit provided by the present invention obtain the ambient temperature through the power-on operation of the air conditioner unit, and obtain the corresponding refrigerant pressure of the air conditioner unit at the ambient temperature. According to the refrigerant pressure, it is determined whether there is a risk of abnormal refrigerant in the air conditioner unit. In the case where there is a risk of abnormal refrigerant in the air conditioner unit, the air conditioner unit is controlled to execute the refrigerant safety protection strategy, which can reduce the explosion risk caused by abnormal refrigerant and improve the safety and reliability of the air conditioner unit. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is one of the flow diagrams of the refrigerant safety protection method of the air conditioner unit provided by the present invention;

[0042] Figure 2 It is another flow diagram of the refrigerant safety protection method of the air conditioner unit provided by the present invention;

[0043] Figure 3 It is the structural diagram of the refrigerant safety protection device of the air conditioner unit provided by the present invention;

[0044] Figure 4 It is the structural diagram of the air conditioner unit provided by the present invention.

[0045] Reference Signs:

[0046] 301: First acquisition module; 302: Second acquisition module;

[0047] 303: Judgment module; 304: Control module;

[0048] 401: Processor; 402: Communication interface;

[0049] 403: Memory; 404: Communication bus. Detailed Embodiments

[0050] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0052] In the description of this specification, the descriptions referring to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. 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, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] The following Figures 1 - 4 describes the refrigerant safety protection method, device and air conditioner unit of the present invention.

[0054] According to an embodiment of the first aspect of the present invention, as shown in Figure 1 the refrigerant safety protection method provided by the present invention mainly includes the following steps:

[0055] S101. The air conditioner unit is powered on and operates, and the ambient temperature is obtained;

[0056] S102. The refrigerant pressure corresponding to the air conditioner unit at the ambient temperature is obtained;

[0057] S103. According to the refrigerant pressure, it is determined whether there is a risk of abnormal refrigerant in the air conditioner unit;

[0058] S104. In the case that there is a risk of abnormal refrigerant in the air conditioner unit, the air conditioner unit is controlled to execute the refrigerant safety protection strategy.

[0059] Specifically, when the air conditioner unit is operating, it detects the temperature of the current environment in real time through a temperature sensor, and detects the refrigerant pressure corresponding to the current environment in real time through a pressure sensor. Then, based on the detected refrigerant pressure, it analyzes and determines whether there is refrigerant leakage or other abnormal conditions in the air conditioner unit. When an abnormal risk of the refrigerant is detected, the air conditioner unit automatically activates a preset safety protection strategy to achieve protection.

[0060] Therefore, the refrigerant safety protection method for the air conditioner unit provided by the embodiment of the present invention can effectively identify and respond to abnormal refrigerant conditions by detecting the environmental temperature and refrigerant pressure in real time, and can reduce the explosion risk caused by abnormal refrigerant, thereby improving the safety and reliability of the air conditioner unit.

[0061] According to an embodiment of the present invention, the step of determining whether there is an abnormal risk of refrigerant in the air conditioner unit according to the refrigerant pressure includes:

[0062] Determine that the refrigerant pressure is less than the lower limit value of the refrigerant saturation pressure corresponding to the environmental temperature, and determine that there is a leakage risk of insufficient refrigerant in the air conditioner unit;

[0063] Determine that the refrigerant pressure is greater than the upper limit value of the refrigerant saturation pressure corresponding to the environmental temperature, and determine that there is a pressure-bearing risk of excessive refrigerant in the air conditioner unit;

[0064] Determine that the refrigerant pressure is greater than or equal to the lower limit value of the refrigerant saturation pressure corresponding to the environmental temperature and less than or equal to the upper limit value of the refrigerant saturation pressure corresponding to the environmental temperature, and determine that the refrigerant in the air conditioner unit is normal.

[0065] Specifically, when the detected refrigerant pressure is less than the lower limit value of the refrigerant saturation pressure corresponding to the environmental temperature, in this case, it indicates that the pressure of the refrigerant is lower than the minimum pressure level that should be achieved during normal operation, indicating that the amount of refrigerant in the unit is insufficient and there is a leakage problem.

[0066] When the detected refrigerant pressure exceeds the upper limit value of the refrigerant saturation pressure corresponding to the environmental temperature, it indicates that there may be an abnormal situation of overcharging refrigerant in the unit. When there is too much refrigerant, there will be a high-pressure situation during the operation of the unit, resulting in a pressure-bearing risk for the refrigerant pipeline of the unit.

[0067] When the detected refrigerant pressure is between the lower limit value and the upper limit value of the refrigerant saturation pressure corresponding to the environmental temperature, it is generally considered that the amount of refrigerant in the unit is normal. At this time, the air conditioner unit can operate normally without taking special safety protection measures.

[0068] It can be understood that the saturation pressure of the refrigerant refers to the pressure at which the refrigerant is in a liquid-vapor equilibrium state at a certain temperature. This means that at this pressure, the refrigerant can be either liquid or gas, and these two states of the refrigerant can be converted into each other to achieve dynamic equilibrium.

[0069] Moreover, the relationship between the saturation pressure of the refrigerant and the ambient temperature can be queried through a saturation pressure - ambient temperature comparison table, which usually gives the saturation pressure values of different refrigerants (such as R290, etc.) at different ambient temperatures.

[0070] Therefore, the embodiments of the present invention can determine whether there is a risk of abnormal refrigerant in the air conditioner unit based on the refrigerant pressure, and take corresponding treatment measures accordingly to ensure the safe and reliable operation of the air conditioner unit.

[0071] According to an embodiment of the present invention, the refrigerant safety protection method of the air conditioner unit of the present invention further includes:

[0072] Determine 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 determine that there is a risk of excessive refrigerant leakage in the air conditioner unit.

[0073] Specifically, when the detected refrigerant pressure is greater than the upper limit value of the refrigerant saturation pressure corresponding to the ambient temperature, it indicates that the refrigerant pressure in the unit is too high, which may be caused by an excessive refrigerant problem. High pressure may cause the refrigerant pipeline to bear too much pressure. If the duration for which the refrigerant pressure continuously exceeds the upper limit value of the refrigerant saturation pressure is greater than a preset threshold (such as several hours or several days), in the long run, it may lead to pipeline rupture and seal failure, thereby also causing refrigerant leakage, indicating that there may be a risk of excessive refrigerant leakage in the unit.

[0074] Therefore, the embodiments of the present invention can more accurately identify the risk of excessive refrigerant based on the comprehensive judgment of the refrigerant pressure and the duration, so as to take countermeasures in a timely manner to ensure the safe and reliable operation of the air conditioning system.

[0075] According to an embodiment of the present invention, in the case where there is a risk of abnormal refrigerant in the air conditioner unit, the steps of controlling the air conditioner unit to execute the refrigerant safety protection strategy include:

[0076] In the case of determining that there is a risk of insufficient refrigerant leakage in the air conditioner unit, control the outdoor fan speed of the air conditioner unit according to the refrigerant pressure of the air conditioner unit;

[0077] In the case of determining that there is a risk of excessive refrigerant pressure in the air conditioner unit, control the opening degree of the electronic expansion valve of the air conditioner unit according to the refrigerant pressure of the air conditioner unit.

[0078] Specifically, when there is a risk of refrigerant leakage due to insufficient refrigerant in the air conditioner unit, the refrigerant will continuously accumulate inside the outdoor unit of the unit. If it cannot be fully diffused, as the refrigerant accumulates more and more, there will be a risk of explosion. At this time, the outdoor fan can be rotated to accelerate the gas exchange from the inside of the outdoor unit to the external environment, so that the refrigerant is discharged from the inside of the outdoor unit, reducing the refrigerant concentration and thus reducing the risk of explosion. To ensure safety, the motor of the outdoor fan uses external drive, and the protection level reaches IP55, ensuring good dust and waterproof performance, and can work stably in harsh environments.

[0079] When there is a risk of excessive pressure on the refrigerant in the air conditioner unit, the pressure in the refrigerant pipeline is relatively high at this time. By reducing the opening degree of the electronic expansion valve, the pressure of the unit can be reduced to prevent potential problems and dangers caused by high pressure.

[0080] Therefore, the embodiments of the present invention can take corresponding protective measures for different types of refrigerant abnormal risks to ensure the safe and reliable operation of the air conditioner unit.

[0081] According to an embodiment of the present invention, in the case of determining that there is a risk of refrigerant leakage due to insufficient refrigerant in the air conditioner unit, the steps of controlling the rotation speed of the outdoor fan of the air conditioner unit according to the refrigerant pressure of the air conditioner unit include:

[0082] In the case of determining that there is a risk of refrigerant leakage due to insufficient refrigerant in the air conditioner unit:

[0083] Determine that the refrigerant pressure of the air conditioner unit reaches the first preset pressure, and control the rotation speed of the outdoor fan of the air conditioner unit to be the first preset speed;

[0084] Determine that the refrigerant pressure of the air conditioner unit reaches the second preset pressure, and control the rotation speed of the outdoor fan of the air conditioner unit to be the second preset speed;

[0085] Determine that the refrigerant pressure of the air conditioner unit reaches the third preset pressure, and control the rotation speed of the outdoor fan of the air conditioner unit to be the third preset speed;

[0086] Wherein, 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.

[0087] Specifically, when it is detected that there is a risk of refrigerant leakage due to insufficient refrigerant in the air conditioner unit, the present invention 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 (that is, the first preset pressure is the largest and the third preset pressure is the smallest).

[0088] When the refrigerant pressure of the air conditioner unit reaches the first preset pressure, control the outdoor fan to operate at the first preset speed. At this time, since the refrigerant pressure is relatively high, it indicates that the refrigerant inventory is relatively large and the refrigerant leakage is at a minor level. Therefore, the fan speed can be appropriately reduced, which can not only ensure the reduction of the refrigerant concentration but also reduce energy consumption.

[0089] When the refrigerant pressure drops to the second preset pressure, it indicates that the refrigerant leakage is at a medium level. At this time, increase the outdoor fan speed to the second preset speed to quickly reduce the refrigerant concentration. And in order to compensate for the decrease in refrigeration capacity caused by refrigerant loss, improve the heat exchange efficiency by increasing the air flow.

[0090] When the refrigerant pressure further drops to the third preset pressure, it indicates that the refrigerant leakage is at a severe level. At this time, increase the outdoor fan speed to the third preset speed to quickly reduce the refrigerant concentration. And in the case of severe refrigerant shortage, this strategy helps to maximize the air flow, so as to maintain a certain cooling effect as much as possible.

[0091] Therefore, the preset speed of the outdoor fan of the present invention 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 an accurate match between the refrigerant leakage level and the fan speed, ensure that the refrigerant concentration is as low as possible at different refrigerant leakage levels, thereby reducing the risk of explosion. On the other hand, it can ensure the heat exchange efficiency as much as possible to cope with the performance degradation problem that may occur when the air conditioner unit has a refrigerant leakage risk.

[0092] According to an embodiment of the present invention, in the case of determining that the air conditioner unit has a risk of excessive pressure due to excessive refrigerant, the steps of controlling the opening degree of the electronic expansion valve of the air conditioner unit according to the refrigerant pressure of the air conditioner unit include:

[0093] In the case of determining that the air conditioner unit has a risk of excessive pressure due to excessive refrigerant:

[0094] Determine that the refrigerant pressure of the air conditioner unit reaches the fourth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be the first preset opening degree;

[0095] Determine that the refrigerant pressure of the air conditioner unit reaches the fifth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be the second preset opening degree;

[0096] Determine that the refrigerant pressure of the air conditioner unit reaches the sixth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be the third preset opening degree;

[0097] Wherein, the fourth preset pressure is less than the fifth preset pressure, and the fifth preset pressure is less than the sixth preset pressure; the first preset opening degree is greater than the second preset opening degree, and the second preset opening degree is greater than the third preset opening degree.

[0098] Specifically, when it is detected that the air conditioner unit has a risk of excessive refrigerant pressure, the present invention 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 smallest and the sixth preset pressure is the largest).

[0099] When the refrigerant pressure of the air conditioner unit reaches the fourth preset pressure, it indicates that the refrigerant pressure is at a slight level. At this time, the opening degree of the electronic expansion valve is controlled to be the first preset opening degree.

[0100] 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 degree of the electronic expansion valve is reduced to the second preset opening degree, thereby reducing the unit pressure and preventing excessive pressure caused by excessive refrigerant.

[0101] When the refrigerant pressure further rises to the sixth preset pressure, it indicates that the refrigerant pressure is at a severe level. At this time, the opening degree of the electronic expansion valve is further reduced to the third preset opening degree. In the case of severely excessive refrigerant, this strategy helps to reduce the refrigerant flow rate, thereby avoiding damage to the unit caused by excessive pressure.

[0102] Therefore, the preset opening degree of the electronic expansion valve of the present invention is inversely proportional to the preset pressure, that is, as the refrigerant pressure increases, the opening degree of the expansion valve gradually decreases. This is because when the pressure increases due to excessive refrigerant, it is necessary to reduce the refrigerant flow rate to maintain the normal refrigeration process and prevent excessive pressure.

[0103] According to an embodiment of the present invention, in the case where the air conditioner unit has a risk of abnormal refrigerant, the steps of controlling the air conditioner unit to execute the refrigerant safety protection strategy further include:

[0104] In the case of determining that the air conditioner unit has a risk of refrigerant leakage due to insufficient refrigerant, controlling the air conditioner unit to send out a first warning prompt message;

[0105] In the case of determining that the air conditioner unit has a risk of excessive refrigerant pressure, controlling the air conditioner unit to send out a second warning prompt message.

[0106] Specifically, when the air conditioner unit has a risk of refrigerant leakage due to insufficient refrigerant, the outdoor fan can be controlled to quickly dissipate the refrigerant, reduce the concentration of the refrigerant, achieve a preliminary protection effect, and the air conditioner unit displays the fault code corresponding to the leakage risk, or directly sends the prompt message of the leakage risk to the user terminal to prompt maintenance in a timely manner.

[0107] When the air conditioner unit has a risk of excessive refrigerant pressure, by controlling the opening degree of the electronic expansion valve, the unit pressure can be reduced as much as possible, achieving a preliminary protection effect, and the air conditioner unit displays the fault code corresponding to the pressure risk, or directly sends the prompt message of the pressure risk to the user terminal to prompt maintenance in a timely manner.

[0108] Therefore, after taking certain safety protection measures, the method of the embodiment of the present invention can send corresponding early warning prompt information according to different risks, so as to facilitate the user to perform timely and targeted maintenance, thereby effectively improving the safe operation of the unit and the user experience.

[0109] According to an embodiment of the present invention, before the step of powering on and operating the air-conditioning unit, it further includes:

[0110] Controlling the outdoor fan of the air-conditioning unit to operate intermittently at a preset period.

[0111] Specifically, before the compressor of the air-conditioning unit is powered on and operates, the outdoor fan is turned on to operate. Even if there is a phenomenon of refrigerant leakage and accumulation before starting up, the refrigerant can be dispersed in advance by turning on the fan in advance, thereby 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.

[0112] The following further describes the refrigerant safety protection method of the air-conditioning unit provided by the present invention with specific examples, as Figure 2 shown, mainly including the following steps:

[0113] (1) The air-conditioning unit is powered on and operates, and the ambient temperature and the corresponding refrigerant pressure Pdm are detected;

[0114] (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;

[0115] (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;

[0116] (4) If Pdm<Pd-Δd, the air-conditioning 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 an early warning for maintenance;

[0117] (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;

[0118] (6) If Pdm>Pd+Δd, the air-conditioning unit has a risk of excessive pressure due to too much refrigerant, and there is a problem of too much refrigerant in the unit. At this time, control the opening of the electronic expansion valve to reduce the pressure, and the unit displays the corresponding fault code to give an early warning for maintenance;

[0119] (7) If not, then Pd - Δd ≤ Pdm ≤ Pd + Δd, the refrigerant of the air conditioner unit is normal, the unit operates normally, and the outdoor fan is operated before starting.

[0120] Next, the refrigerant safety protection device for an air conditioner unit provided by the present invention will be further described. The refrigerant safety protection device for an air conditioner unit described below can be correspondingly referred to the refrigerant safety protection method for an air conditioner unit described above.

[0121] According to an embodiment of the second aspect of the present invention, referring to Figure 3 As shown, the present invention further provides a refrigerant safety protection device for an air conditioner unit, which mainly includes: a first acquisition module 301, a second acquisition module 302, a determination module 303, and a control module 304. Among them, the first acquisition module 301 is used to power on and operate the air conditioner unit to acquire the ambient temperature; the second acquisition module 302 is used to acquire the refrigerant pressure corresponding to the air conditioner unit at the ambient temperature; the determination module 303 is used to determine whether there is a risk of abnormal refrigerant in the air conditioner unit according to the refrigerant pressure; the control module 304 is used to control the air conditioner unit to execute a refrigerant safety protection strategy when there is a risk of abnormal refrigerant in the air conditioner unit.

[0122] The refrigerant safety protection device for an air conditioner unit provided by the embodiment of the present invention can reduce the explosion risk caused by abnormal refrigerant and improve the safety and reliability of the air conditioner unit.

[0123] According to an embodiment of the third aspect of the present invention, referring to Figure 4 As shown, the present invention further provides an air conditioner unit, which may include: a processor 401, a communication interface 402, a memory 403, and a communication bus 404. Among them, the processor 401, the communication interface 402, and the memory 403 complete mutual communication through the communication bus 404. The processor 401 can call the logical instructions in the memory 403 to execute the refrigerant safety protection method for an air conditioner unit, and the method includes: powering on and operating the air conditioner unit to acquire the ambient temperature; acquiring the refrigerant pressure corresponding to the air conditioner unit at the ambient temperature; determining whether there is a risk of abnormal refrigerant in the air conditioner unit according to the refrigerant pressure; and controlling the air conditioner unit to execute a refrigerant safety protection strategy when there is a risk of abnormal refrigerant in the air conditioner unit.

[0124] In addition, when the logical instructions in the above-mentioned memory 403 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0125] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that 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 refrigerant safety protection method for an air conditioner unit provided by the above-mentioned various methods. The method includes: powering on the air conditioner unit to operate and obtaining the ambient temperature; obtaining the refrigerant pressure corresponding to the air conditioner unit at the ambient temperature; determining whether there is a refrigerant abnormality risk for the air conditioner unit according to the refrigerant pressure; and controlling the air conditioner unit to execute a refrigerant safety protection strategy in the case where the air conditioner unit has a refrigerant abnormality risk.

[0126] On another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the refrigerant safety protection method for an air conditioner unit provided by the above-mentioned various methods. The method includes: powering on the air conditioner unit to operate and obtaining the ambient temperature; obtaining the refrigerant pressure corresponding to the air conditioner unit at the ambient temperature; determining whether there is a refrigerant abnormality risk for the air conditioner unit according to the refrigerant pressure; and controlling the air conditioner unit to execute a refrigerant safety protection strategy in the case where the air conditioner unit has a refrigerant abnormality risk.

[0127] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0128] 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, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing 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 some parts of the embodiments.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigerant safety protection method for an air conditioning unit, characterized in that, Including: After the air conditioner unit is powered on and running, obtain the ambient temperature; Obtain the refrigerant pressure corresponding to the air conditioner unit at the ambient temperature; Judge whether there is a risk of abnormal refrigerant in the air conditioner unit according to the refrigerant pressure; In the case that there is a risk of abnormal refrigerant in the air conditioner unit, control the air conditioner unit to execute a refrigerant safety protection strategy.

2. The refrigerant safety protection method for an air conditioning unit according to claim 1, characterized in that, The step of judging whether there is a risk of abnormal refrigerant in the air conditioner unit according to the refrigerant pressure includes: Determine that the refrigerant pressure is less than the lower limit value of the refrigerant saturation pressure corresponding to the ambient temperature, and judge that there is a risk of refrigerant leakage due to insufficient refrigerant in the air conditioner unit; Determine that the refrigerant pressure is greater than the upper limit value of the refrigerant saturation pressure corresponding to the ambient temperature, and judge that there is a risk of excessive pressure on the refrigerant in the air conditioner unit; Determine that the refrigerant pressure is greater than or equal to the lower limit value of the refrigerant saturation pressure corresponding to the ambient temperature and less than or equal to the upper limit value of the refrigerant saturation pressure corresponding to the ambient temperature, and judge that the refrigerant in the air conditioner unit is normal.

3. The refrigerant safety protection method for an air conditioning unit according to claim 2, characterized in that, It also includes: Determine 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 judge that there is a risk of refrigerant leakage due to excessive refrigerant in the air conditioner unit.

4. The refrigerant safety protection method for an air conditioning unit according to claim 2, characterized in that, The step of controlling the air conditioner unit to execute a refrigerant safety protection strategy in the case that there is a risk of abnormal refrigerant in the air conditioner unit includes: In the case of judging that there is a risk of refrigerant leakage due to insufficient refrigerant in the air conditioner unit, control the rotation speed of the outdoor fan of the air conditioner unit according to the refrigerant pressure of the air conditioner unit; In the case of judging that there is a risk of excessive pressure on the refrigerant in the air conditioner unit, control the opening degree of the electronic expansion valve of the air conditioner unit according to the refrigerant pressure of the air conditioner unit.

5. The refrigerant safety protection method for an air conditioning unit according to claim 4, characterized in that, The step of controlling the rotation speed of the outdoor fan of the air conditioner unit according to the refrigerant pressure of the air conditioner unit includes: Determine that the refrigerant pressure of the air conditioner unit reaches a first preset pressure, and control the rotation speed of the outdoor fan of the air conditioner unit to be a first preset rotation speed; Determine that the refrigerant pressure of the air conditioner unit reaches a second preset pressure, and control the rotation speed of the outdoor fan of the air conditioner unit to be a second preset rotation speed; Determine that the refrigerant pressure of the air conditioner unit reaches a third preset pressure, and control the rotation speed of the outdoor fan of the air conditioner unit to be a third preset rotation speed; Wherein, 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 rotation speed is less than the second preset rotation speed, and the second preset rotation speed is less than the third preset rotation speed.

6. The refrigerant safety protection method for an air conditioning unit according to claim 4, characterized in that, The step of controlling the opening degree of the electronic expansion valve of the air conditioner unit according to the refrigerant pressure of the air conditioner unit includes: Determine that the refrigerant pressure of the air conditioner unit reaches a fourth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be a first preset opening degree; Determine that the refrigerant pressure of the air conditioner unit reaches a fifth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be a second preset opening degree; Determine that the refrigerant pressure of the air conditioner unit reaches a sixth preset pressure, and control the opening degree of the electronic expansion valve of the air conditioner unit to be a third preset opening degree; Among them, the fourth preset pressure is less than the fifth preset pressure, and the fifth preset pressure is less than the sixth preset pressure; the first preset opening is greater than the second preset opening, and the second preset opening is greater than the third preset opening.

7. The refrigerant safety protection method for an air conditioning unit according to claim 4, characterized in that, When the air conditioner unit has a refrigerant abnormality risk, the step of controlling the air conditioner unit to execute a refrigerant safety protection strategy further includes: When it is determined that the air conditioner unit has a refrigerant leakage risk of being too little, controlling the air conditioner unit to send out a first warning prompt message; When it is determined that the air conditioner unit has a pressure-bearing risk of having too much refrigerant, controlling the air conditioner unit to send out a second warning prompt message.

8. The refrigerant safety protection method for an air conditioning unit according to any one of claims 1-7, characterized in that, Before the step of powering on and operating the air conditioner unit, it further includes: Controlling the outdoor fan of the air conditioner unit to run intermittently at a preset period.

9. A refrigerant safety protection device for an air conditioner unit, characterized in that, It includes: A first acquisition module, used for powering on and operating the air conditioner unit to acquire the ambient temperature; A second acquisition module, used for acquiring the refrigerant pressure corresponding to the air conditioner unit at the ambient temperature; A determination module, used for determining whether the air conditioner unit has a refrigerant abnormality risk according to the refrigerant pressure; A control module, used for controlling the air conditioner unit to execute a refrigerant safety protection strategy when the air conditioner unit has a refrigerant abnormality risk.

10. An air conditioner unit, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the air conditioner unit refrigerant safety protection method according to any one of claims 1-8.

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