Air conditioner capillary tube blocking detection method and related equipment

Abstract

The invention relates to the technical field of air conditioners, in particular to an air conditioner capillary tube blocking detection method and related device.The method comprises the steps that detection data obtained after an air conditioner system is started are collected at a preset frequency, and the blocking type of an air conditioner capillary tube is determined based on the detection data and the variable quantity of the detection data; wherein the detection data comprises evaporator inner pipe temperature and air conditioning system current; the variable quantity is a difference value between the currently acquired data and the data acquired last time; the blocking types of the capillary tube of the air conditioner comprise ice blocking, oil blocking and filth blocking. Therefore, by collecting the evaporator inner tube temperature and the air conditioning system current after the air conditioning system is started, the blocking type of the air conditioning capillary tube is judged based on the evaporator inner tube temperature, the air conditioning system current and the variable quantity, and the method is simple and efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a method for detecting blockage of an air conditioner capillary and related equipment. Background Art

[0002] When the air conditioner uses a capillary tube as a throttling device, due to the small inner diameter of the capillary tube, ice blockage, oil blockage or even dirt blockage may occur inside the capillary tube, causing abnormal operation of the machine, and in serious cases, causing damage to the machine. When ice blockage, oil blockage or dirt blockage occurs inside the capillary tube, it is often accompanied by a false alarm of fluorine deficiency protection. At the same time, if there is no timely warning when the capillary tube is blocked and the machine is forced to shut down, it may cause damage to the compressor.

[0003] Existing technical solutions can often only make judgments on the type of blockage in a certain system, and it is difficult to distinguish and judge the types of blockage (ice blockage, oil blockage, dirty blockage), and the detection parameters involved are more and more complicated, which brings great inconvenience to users and after-sales processing. For example, patent CN216557574U discloses a method for reminding users that the air-conditioning system has too little refrigerant and dirty blockage. It is controlled by two temperature sensing bags and low-pressure sensors in the indoor unit. This method has the disadvantages of many variables required for judgment and complex structure, and it is difficult to effectively distinguish the type of system blockage; patent CN108050648B discloses a method for determining whether the system has oil blockage by comparing the pressure size and duration of the pressure stop valve with the preset time. This method requires the installation of a stop valve and a pressure sensor, and the structure is complex. It is only for oil blockage in the system and has a narrow scope of use. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an air-conditioning capillary blockage detection method and related equipment to overcome the current problem in the air-conditioning field that the capillary blockage type cannot be simply and accurately detected.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present application provides a method for detecting blockage of an air conditioner capillary, comprising:

[0007] Collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change amount of the detection data;

[0008] Among them, the detection data includes the tube temperature in the evaporator and the current of the air conditioning system; the change amount is the difference between the currently collected data and the last collected data; the blockage types of the air conditioning capillary include ice blockage, oil blockage and dirt blockage.

[0009] Further, in some embodiments of the present application, the detection data after the air conditioning system is turned on is collected at a preset frequency, and the blockage type of the air conditioning capillary is determined based on the detection data and the change amount of the detection data, including:

[0010] Determine whether the change in the temperature of the tube in the evaporator within the first preset time after the air conditioning system is turned on is always greater than 0. If so, determine that the blockage type of the air conditioning capillary is oil blockage or dirt blockage, and continue the following processing:

[0011] The temperature of the inner tube of the evaporator is set to a first preset temperature, and the air-conditioning system is allowed to continue to run for a second preset time, and then the temperature of the inner tube of the evaporator is collected at a preset frequency to determine whether a change in the temperature of the inner tube of the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is dirty blockage; wherein the first preset temperature value is a temperature that can prevent the refrigeration oil of the air-conditioning system from condensing.

[0012] Further, in some embodiments of the present application, the collecting of detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change in the detection data, further includes:

[0013] If the change in the tube temperature of the evaporator within the first preset time after the air-conditioning system is turned on is not always greater than 0, continue to determine whether the change in the tube temperature of the evaporator after the air-conditioning system is turned on first decreases and then increases. If the judgment result is no, it is determined that the air-conditioning capillary is not blocked.

[0014] Further, in some embodiments of the present application, the collecting of detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change in the detection data, further includes:

[0015] If the judgment result is yes as to whether the change in the tube temperature in the evaporator after the air-conditioning system is turned on first decreases and then increases, then continue to judge whether the change in the current of the air-conditioning system is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is refrigerant leakage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is ice blockage or oil blockage.

[0016] Further, in some embodiments of the present application, the collecting of detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change in the detection data, further includes:

[0017] After determining that the blockage type of the air-conditioning capillary is ice blockage or oil blockage based on the change in the current of the air-conditioning system, determine the minimum operating temperature of the inner tube of the evaporator, and judge whether the minimum operating temperature is greater than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage.

[0018] Further, in some embodiments of the present application, the collecting of detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change in the detection data, further includes:

[0019] If the judgment result of whether the minimum operating temperature is greater than 0 is no, the temperature of the inner tube of the evaporator is set to a second preset temperature, and the air-conditioning system continues to run normally after the third preset time, and then the temperature of the inner tube of the evaporator is collected at a preset frequency to determine whether the change in the temperature of the inner tube of the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage; wherein, the second preset temperature is less than 0°C.

[0020] Further, in some embodiments of the present application, the collecting of detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change in the detection data, further includes:

[0021] If the judgment result of whether the change in the temperature of the tubes in the evaporator after the air-conditioning system runs normally at the second preset temperature for the third preset time is less than 0 is no, the temperature of the tubes in the evaporator is set to the third preset temperature, and the air-conditioning system continues to run normally for the third preset time, and then the temperature of the tubes in the evaporator is collected at a preset frequency to judge whether the change in the temperature of the tubes in the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is ice blockage or oil blockage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is oil blockage; wherein, the third preset temperature is greater than 0°C.

[0022] In a second aspect, the present application also provides an air-conditioning capillary tube blockage detection system, comprising a collection unit, a calculation unit and a control unit, wherein the air-conditioning capillary tube blockage detection system is used to execute the air-conditioning capillary tube blockage detection method as described above.

[0023] In a third aspect, the present application also provides an air conditioning capillary blockage detection device, comprising a processor and a memory, wherein the processor is connected to the memory:

[0024] Wherein, the processor is used to call and execute the program stored in the memory;

[0025] The memory is used to store the program, and the program is at least used to execute the above-mentioned air conditioning capillary blockage detection method.

[0026] In a fourth aspect, the present application also provides an air conditioner, characterized in that it includes an air conditioner main body and the above-mentioned air conditioner capillary blockage detection system.

[0027] The present invention relates to the technical field of air conditioning, and specifically to a method for detecting the blockage of an air conditioning capillary and related equipment, the method comprising collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the variation of the detection data; wherein the detection data comprises the temperature of the tube in the evaporator and the current of the air conditioning system; the variation is the difference between the currently collected data and the last collected data; the blockage types of the air conditioning capillary include ice blockage, oil blockage and dirt blockage. In this way, by collecting the temperature of the tube in the evaporator and the current of the air conditioning system after the air conditioning system is turned on, the blockage type of the air conditioning capillary is determined based on the temperature of the tube in the evaporator and the current of the air conditioning system and their variation, which is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 1 is a flow chart of a method for detecting air conditioner capillary blockage provided by an embodiment of the present invention;

[0030] Figure 2 is a flow chart of a method for detecting air conditioner capillary blockage provided by another embodiment of the present invention;

[0031] Figure 3 It is a structural schematic diagram of an air-conditioning capillary blockage detection system provided by the present invention;

[0032] Figure 4 It is a structural schematic diagram of the air-conditioning capillary blockage detection device provided by the present invention. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] Figure 1 is a flow chart of the air conditioner capillary blockage detection method provided by the embodiment of the present invention, please refer to Figure 1 , this embodiment may include the following steps:

[0035] S101, collecting detection data of the air conditioning system after it is turned on at a preset frequency.

[0036] Specifically, after the air-conditioning system to be tested is turned on, the preset acquisition module is used to collect the internal pipe temperature of the air-conditioning system evaporator and the current of the air-conditioning system at a certain frequency, such as 3 to 5 seconds between two adjacent acquisitions, wherein the internal pipe temperature refers to the temperature sensing package on the evaporator, which is used to detect the evaporator temperature. In this application, the collected internal pipe temperature of the evaporator can be represented by Tn. The current of the air-conditioning system can be obtained by directly collecting the current value of the air-conditioning system through the acquisition module, wherein the installation position of the acquisition module is not limited, as long as the current value of the air-conditioning system can be detected, and the part of the acquisition module used for collecting current is packaged but not limited to the current detection module or current sensor on the mainboard.

[0037] S102: Determine the blockage type of the air conditioning capillary based on the detection data and the variation of the detection data.

[0038] Among them, the detection data includes the temperature of the tube in the evaporator and the current of the air conditioning system; the change is the difference between the currently collected data and the last collected data; the blockage types of the air conditioning capillary include ice blockage, oil blockage and dirt blockage.

[0039] The air-conditioning capillary blockage detection method provided in the present application can determine the blockage type of the air-conditioning capillary by dynamically and in real time detecting and calculating the machine evaporator tube temperature and current during the operation of the air-conditioning system, directly based on the temperature value and the current value and the change amount of the two, and can also determine the blockage type of the air-conditioning capillary by two parameters commonly used in two air-conditioning systems, thereby reducing the changes to the original air-conditioning system and being more practical.

[0040] Figure 2 is a flow chart of a method for detecting air conditioner capillary blockage provided by another embodiment of the present invention. Figure 2 , this embodiment may include the following steps:

[0041] First, after the air conditioner or air conditioning system to be tested is running, the tube temperature Tn in the evaporator is detected (generally one point is collected every 3 to 5 seconds), and then the difference ΔTn between the two collection points is calculated.

[0042] On this basis, it is determined whether the change in the temperature of the tubes in the evaporator within the first preset time t1 after the air-conditioning system is turned on is always greater than 0. If so, it is determined that the blockage type of the air-conditioning capillary is oil blockage or dirty blockage, and the following processing is continued: the temperature of the tubes in the evaporator is set to the first preset temperature Ta, and the air-conditioning system continues to run for the second preset time t2, and then the temperature of the tubes in the evaporator is collected at a preset frequency (in actual applications, the collection module can be running all the time, and the data of the corresponding time period can be directly taken here), and it is determined whether the change in the temperature of the tubes in the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is dirty blockage; wherein, the first preset temperature value Ta is a temperature that can prevent the refrigeration oil of the air-conditioning system from condensing.

[0043] Specifically, within the time t1 (t1 refers to the time required for a general air conditioner to start up and stabilize operation, generally 10 to 30 minutes is preferred), if it is detected in this time period (or if it is detected in this time period) that ΔTn continues to be greater than 0, it is determined that the system is blocked by oil or dirt. Because the system is blocked by oil or dirt, the refrigerant cannot flow normally. As the compressor continues to compress, the pipe temperature will continue to rise.

[0044] In order to further determine whether the system blockage is oil blockage or dirt blockage, Tn=Ta (here, the temperature of the inner tube of the evaporator is set to the first preset temperature Ta, wherein Ta is set according to the characteristics of the system's refrigeration oil, generally taking the temperature at which the refrigeration oil is not easy to condense, preferably 15-25°C), and continue to run for t2 time (t2 is preferably 10-45min), and then detect whether ΔTn is less than 0. If so, it means that the system has refrigerant flowing and is no longer blocked, so it is determined that the system blockage during startup is oil blockage (due to the increase in evaporation temperature, the oil no longer condenses); if not, it means that it is not oil blockage, but dirty blockage (dirty blockage is impurity blockage, such as welding slag, copper chips, dust, etc., which cannot be solved by heating)

[0045] On this basis, more accurate classification judgments can be made, including: if the change in the temperature of the tubes in the evaporator within the first preset time after the air-conditioning system is turned on is not always greater than 0, then continue to judge whether the change in the temperature of the tubes in the evaporator after the air-conditioning system is turned on first decreases and then increases. If the judgment result is no, it is determined that the air-conditioning capillary is not blocked.

[0046] Specifically, if the air conditioning system detects that ΔTn is not always > 0 within the t1 time after startup, it will enter the judgment: whether Tn first decreases and then increases after startup. If not, that is, Tn has been decreasing, it means that the system is operating normally (with the air conditioning adjustment, the decrease in ambient temperature will cause the evaporation temperature to decrease), and the air conditioning capillary is not blocked.

[0047] On this basis, more accurate classification judgments can be made, including: if the judgment result is yes, whether the change in the temperature of the tube in the evaporator after the air-conditioning system is turned on is first decreased and then increased, then continue to judge whether the change in the current of the air-conditioning system is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is refrigerant leakage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is ice blockage or oil blockage.

[0048] Specifically, if Tn decreases first and then increases after startup, it is determined whether the change ΔI of the current I is less than 0. If so, it means that the current has been decreasing, and it can be determined that the system refrigerant is leaking (when the system refrigerant starts to leak, the evaporator temperature will first go through a period of decline, and then as the refrigerant leakage increases, the superheat of the evaporator becomes larger and larger, and the internal pipe temperature will gradually increase; and when the refrigerant leaks, the system load becomes lower, the power decreases, and the current also decreases accordingly); if not, it means that it is not caused by refrigerant leakage, and it is determined that the system is blocked by ice or oil (during the operation of the system, the oil or water in the pipeline gradually condenses. During the condensation process, the flow gradually decreases, the evaporator temperature will first decrease, and then as time goes by, the system is completely blocked, the refrigerant cannot flow normally, and the evaporator temperature will gradually increase)

[0049] On this basis, more accurate classification judgments can be made, including: after determining that the blockage type of the air-conditioning capillary is ice blockage or oil blockage based on the change in the current of the air-conditioning system, determine the minimum operating temperature of the evaporator inner tube, and judge whether the minimum operating temperature is greater than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage.

[0050] Specifically, based on the above embodiment, in order to further distinguish whether the system blockage is oil blockage or ice blockage, the lowest operating temperature Tnl of the evaporator tube temperature during the system operation can be obtained, and then it is determined whether Tnl is greater than 0. If so, it means that the system is not blocked by ice, but by oil (the lowest temperature of the evaporator is greater than 0, and the water cannot condense into ice).

[0051] On this basis, more accurate classification judgments can be made, including: if the judgment result of whether the minimum operating temperature is greater than 0 is no, the temperature of the inner tube of the evaporator is set to the second preset temperature Tb, and the air-conditioning system continues to run normally after the third preset time t3, and then the temperature of the inner tube of the evaporator is collected at a preset frequency to determine whether the change in the temperature of the inner tube of the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage; wherein, the second preset temperature is less than 0°C.

[0052] Specifically, if the result of judging whether the minimum operating temperature is greater than 0 is no, a second preset temperature Tb is set, Tb is near 0°C, the closer to 0°C the better, and Tb is on the left side of 0°C (i.e. less than 0°C), let Tn = Tb (i.e. set the temperature of the inner tube of the evaporator to Tb), and then set the duration of continued operation t3 (the duration of operation can be determined according to Tb, the larger the Tb, the shorter the time needs to be, generally preferably 15 to 60 minutes), and then run normally, and then check whether ΔTn is less than 0. If so (i.e. whether ΔTn here is less than 0), it means that even if the system is running at an evaporator temperature less than 0°C, the system has changed from being blocked to being unblocked, thereby eliminating ice blockage (if it is ice blockage, it will not be released at a temperature of Tb less than 0°C), that is, it is determined that the system blockage is oil blockage.

[0053] On this basis, more accurate classification judgments can be made, specifically including: if the judgment result is no, whether the change in the temperature of the tubes in the evaporator after the air-conditioning system runs normally at the second preset temperature for the third preset time is less than 0, then the temperature of the tubes in the evaporator is set to the third preset temperature, and the air-conditioning system continues to run normally for the third preset time, and then the temperature of the tubes in the evaporator is collected at a preset frequency to determine whether the change in the temperature of the tubes in the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is ice blockage or oil blockage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is oil blockage; wherein, the third preset temperature is greater than 0°C.

[0054] Specifically, if the judgment result is no as to whether the change in the tube temperature in the evaporator after the air-conditioning system runs normally at the second preset temperature for the third preset time is less than 0, then a third preset temperature Tc is determined, and Tc is also near 0°C, the closer to 0°C the better, and Tc is on the right side of 0°C (i.e. greater than 0°C).

[0055] Set Tn = Tc (i.e. set the temperature of the inner tube of the evaporator to Tc), set the running time t3, and then run normally, and then check whether ΔTn is less than 0. If so (i.e. whether ΔTn here is less than 0), it means that the system blockage may be ice blockage or oil blockage (the evaporator temperature rises above zero degrees, which can not only resolve the ice blockage, but also increase the activity of the oil, which may resolve the oil blockage); if not, it means that the system is still blocked, and it can be determined that the system blockage is oil blockage (the reason why it is not ice blockage is that the evaporator temperature is greater than 0℃ Tc. If it is ice blockage, the ice will gradually melt and the refrigerant should be able to flow normally).

[0056] It should be noted that in the present application, Tb and Tc are respectively set near 0°C, the closer to 0°C the better, because when Tb is on the left side of 0°C, if Tb is set too low, ice blockage and oil blockage are likely to occur together, making it more difficult to distinguish the type of system blockage; similarly, when Tc is on the right side of 0°C, if Tc is set too high, ice blockage and oil blockage are obviously relieved, making it impossible to distinguish whether the system is blocked by ice or oil.

[0057] In addition, in actual applications, the time parameter t1 in the above embodiment is the time required to enter the initial judgment just after starting up, and can be set according to the air conditioner's own configuration during actual settings. t2 is the time required for the evaporator temperature Tn to continue running after it is set to the Ta value. t3 is the time required for the evaporator temperature Tn to continue running after it is set to the Tb value or the Tc value. t2 and t3 are related to the refrigerant and refrigeration oil characteristics of the air conditioning system, and can be set manually according to specific circumstances.

[0058] It should be noted that the air conditioner capillary blockage detection method provided in the present application may include multiple steps or all of the above steps in sequence (such as Figure 2 The process including all detection and judgment steps shown in the figure) is a process including multiple steps, wherein the implementation method including multiple steps can realize the rapid judgment of the possible types of capillary blockage, and the implementation method including all steps uses a multi-level closed-loop control logic to detect the evaporator temperature and current, first give a preliminary judgment, and then adjust the evaporator temperature to a certain value and continue to operate normally, and then continue to detect the evaporator temperature and current, and make judgments on ice blockage, oil blockage, and dirty blockage of the capillary according to the changes in temperature and current, effectively detect and judge the internal blockage of the air-conditioning capillary, and can accurately identify the specific types of capillary blockage including ice blockage, oil blockage and dirty blockage. During the operation of the machine, the machine evaporator tube temperature and current can be dynamically and real-time detected and calculated. When the air-conditioning system to be tested is abnormal, the corresponding problem warning is issued in time, so as to facilitate targeted problem solving.

[0059] In addition, the air conditioning capillary blockage detection method provided by the present application can be applied to various air conditioning fields, including but not limited to dehumidifiers, mobile machines, split wall-mounted machines, etc., and the relevant parameters can be adjusted according to the specific system configuration. In addition to capillary blockage, it can also be applied to other easily blocked parts in some more complex air conditioning systems, and only the detection position needs to be adjusted accordingly.

[0060] Based on the same inventive concept, the present invention also provides an air conditioning capillary blockage detection system. Figure 3 FIG. 1 is a schematic diagram of the structure of the air conditioning capillary blockage detection system provided by the present invention. Figure 3As shown, the air-conditioning capillary blockage detection system includes a collection unit 11, a calculation unit 12 and a control unit 13, which are used to execute the air-conditioning capillary blockage detection method mentioned in the above method embodiment, wherein the collection unit 11 is used to collect detection data after the air-conditioning system is turned on at a preset frequency; the calculation unit 12 determines the blockage type of the air-conditioning capillary based on the detection data and the change in the detection data; the control unit 13 is used to control the air-conditioning system as well as the collection unit 11 and the calculation unit 12, so as to implement the air-conditioning capillary blockage detection method mentioned in the above method embodiment.

[0061] The specific implementation scheme of the air conditioning capillary tube blockage detection system provided in the embodiments of the present application can refer to the implementation scheme of the air conditioning capillary tube blockage detection method in any of the above embodiments, which will not be repeated here.

[0062] Based on the same inventive concept, the present invention also provides an air conditioning capillary blockage detection device, Figure 4 Schematic diagram of the structure of the air conditioner capillary blockage detection device provided by the present invention, such as Figure 4 As shown, the device includes a processor 21 and a memory 22, and the processor 21 is connected to the memory 22: wherein the processor 21 is used to call and execute the program stored in the memory 22; the memory 22 is used to store the program, and the program is at least used to execute the air conditioning capillary blockage detection method mentioned in the above method embodiment.

[0063] The specific implementation scheme of the air-conditioning capillary tube blockage detection device provided in the embodiment of the present application can refer to the implementation scheme of the air-conditioning capillary tube blockage detection method in any of the above embodiments, which will not be repeated here.

[0064] Based on the same inventive concept, the present invention also provides an air conditioner, including an air conditioner main body (ie, the air conditioner system to be tested mentioned in the above method embodiment) and an air conditioner capillary blockage detection system as mentioned in the above system embodiment.

[0065] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0066] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0067] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0068] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0069] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0070] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0071] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for detecting blockage of an air conditioner capillary, characterized in that: include: Collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change amount of the detection data; Among them, the detection data includes the tube temperature in the evaporator and the current of the air conditioning system; the change amount is the difference between the currently collected data and the last collected data; the blockage types of the air conditioning capillary include ice blockage, oil blockage and dirt blockage.

2. The air conditioning capillary blockage detection method according to claim 1, characterized in that: The method of collecting the detection data after the air conditioning system is turned on at a preset frequency and determining the blockage type of the air conditioning capillary based on the detection data and the variation of the detection data includes: Determine whether the change in the temperature of the tube in the evaporator within the first preset time after the air conditioning system is turned on is always greater than 0. If so, determine that the blockage type of the air conditioning capillary is oil blockage or dirt blockage, and continue the following processing: The temperature of the inner tube of the evaporator is set to a first preset temperature, and the air-conditioning system is allowed to continue to run for a second preset time, and then the temperature of the inner tube of the evaporator is collected at a preset frequency to determine whether a change in the temperature of the inner tube of the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is dirty blockage; wherein the first preset temperature value is a temperature that can prevent the refrigeration oil of the air-conditioning system from condensing.

3. The air conditioning capillary blockage detection method according to claim 2, characterized in that: The method of collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change amount of the detection data, further includes: If the change in the tube temperature of the evaporator within the first preset time after the air-conditioning system is turned on is not always greater than 0, continue to determine whether the change in the tube temperature of the evaporator after the air-conditioning system is turned on first decreases and then increases. If the judgment result is no, it is determined that the air-conditioning capillary is not blocked.

4. The air conditioning capillary blockage detection method according to claim 3, characterized in that: The method of collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change amount of the detection data, further includes: If the judgment result is yes as to whether the change in the tube temperature in the evaporator after the air-conditioning system is turned on first decreases and then increases, then continue to judge whether the change in the current of the air-conditioning system is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is refrigerant leakage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is ice blockage or oil blockage.

5. The air conditioning capillary blockage detection method according to claim 4, characterized in that: The method of collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change amount of the detection data, further includes: After determining that the blockage type of the air-conditioning capillary is ice blockage or oil blockage based on the change in the current of the air-conditioning system, determine the minimum operating temperature of the inner tube of the evaporator, and judge whether the minimum operating temperature is greater than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage.

6. The air conditioning capillary blockage detection method according to claim 5, characterized in that: The method of collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change amount of the detection data, further includes: If the judgment result of whether the minimum operating temperature is greater than 0 is no, the temperature of the inner tube of the evaporator is set to a second preset temperature, and the air-conditioning system continues to run normally after the third preset time, and then the temperature of the inner tube of the evaporator is collected at a preset frequency to determine whether the change in the temperature of the inner tube of the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is oil blockage; wherein, the second preset temperature is less than 0°C.

7. The air conditioning capillary blockage detection method according to claim 6, characterized in that: The method of collecting detection data after the air conditioning system is turned on at a preset frequency, and determining the blockage type of the air conditioning capillary based on the detection data and the change amount of the detection data, further includes: If the judgment result of whether the change in the temperature of the tubes in the evaporator after the air-conditioning system runs normally at the second preset temperature for the third preset time is less than 0 is no, the temperature of the tubes in the evaporator is set to the third preset temperature, and the air-conditioning system continues to run normally for the third preset time, and then the temperature of the tubes in the evaporator is collected at a preset frequency to judge whether the change in the temperature of the tubes in the evaporator is less than 0. If the judgment result is yes, it is determined that the blockage type of the air-conditioning capillary is ice blockage or oil blockage; if the judgment result is no, it is determined that the blockage type of the air-conditioning capillary is oil blockage; wherein, the third preset temperature is greater than 0°C.

8. An air conditioning capillary blockage detection system, characterized in that: Comprising a collection unit, a calculation unit and a control unit, the air conditioning capillary tube blockage detection system is used to execute the air conditioning capillary tube blockage detection method as described in any one of claims 1-7.

9. An air conditioning capillary blockage detection device, characterized in that: The invention comprises a processor and a memory, wherein the processor is connected to the memory: Wherein, the processor is used to call and execute the program stored in the memory; The memory is used to store the program, and the program is at least used to execute the air conditioning capillary blockage detection method described in any one of claims 1-7.

10. An air conditioner, characterized in that: It comprises an air conditioner main body and the air conditioner capillary tube blockage detection system as claimed in claim 8.

Images