Method for detecting state of compressor rotor in air conditioning system and air conditioning system

Abstract

The invention discloses a method for detecting the state of a compressor rotor in an air conditioning system and the air conditioning system.The method for detecting the state of the compressor rotor in the air conditioning system comprises the steps that when the air conditioning system operates in a low-temperature heating working condition, fault information of a compressor is monitored in real time; and whether the fault information of the compressor meets a preset fault condition or not is judged, and if yes, the rotor state of the compressor is judged according to the operation parameters of the air conditioner system. Compared with the prior art, when the compressor breaks down, whether the compressor fault is rotor jamming or not can be judged, the fault position of the compressor is accurately positioned, and the subsequent maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to a method for detecting the state of a compressor rotor in an air conditioning system and the air conditioning system. Background Art

[0002] The compressor plays a vital role in the cooling and heating process of the air-conditioning system. It is responsible for energy conversion, heat energy transfer, system pressure control, etc., and is the core component of the air-conditioning system.

[0003] Under ultra-low temperature conditions, the outdoor ambient temperature is very low, which causes the evaporator temperature to be extremely low. The evaporation rate of the refrigerant in the evaporator is slowed down, and some liquid refrigerant is sucked into the compressor before it is completely vaporized, resulting in liquid accumulation.

[0004] After the liquid refrigerant enters the compressor, since the liquid is incompressible, when the piston or scroll plate tries to compress the liquid, it will generate a huge impact force, causing damage to the internal parts of the compressor (such as the piston, connecting rod, crankshaft, etc.) and the rotor to get stuck. At this time, related faults will occur when the machine is restarted and it cannot be started.

[0005] Therefore, how to design a compressor rotor status detection method and air-conditioning system in an air-conditioning system to determine whether the compressor failure is caused by rotor jamming and then locate the specific fault location is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0006] In view of the problem in the prior art that when a compressor fails, it is impossible to determine whether the compressor failure is caused by rotor jamming, the present invention proposes a compressor rotor state detection method in an air-conditioning system and an air-conditioning system.

[0007] The technical solution of the present invention is to propose a method for detecting the state of a compressor rotor in an air-conditioning system, comprising: when the air-conditioning system is operating in a low-temperature heating condition, real-time monitoring of the fault information of the compressor; It is determined whether the fault information of the compressor meets a preset fault condition. If so, the rotor state of the compressor is determined according to the operating parameters of the air-conditioning system.

[0008] Furthermore, the compressor fault information includes: the number of times the compressor has an overcurrent fault and a step-out fault; Determining whether the fault information of the compressor meets a preset fault condition includes: Determine whether the number of out-of-step failures of the compressor within the first preset time has reached a preset number; If so, when an overcurrent fault exists before the compressor loses step, it is determined that the fault information of the compressor meets the preset fault condition.

[0009] Further, the operating parameters of the air conditioning system include: the operating high pressure of the air conditioning system, the operating low pressure of the air conditioning system, and the exhaust temperature of the air conditioning system. Judging the rotor state of the compressor according to the operating parameters of the air conditioning system includes: Calculating the pressure difference between the operating high pressure and the operating low pressure of the air conditioning system, and judging whether the pressure difference is less than a preset threshold; If so, judging whether the exhaust temperature of the air conditioning system rises within a second preset time; When the exhaust temperature of the air conditioning system does not rise within the second preset time, it is determined that the rotor of the compressor is stuck.

[0010] Further, when the pressure difference is greater than the preset threshold and / or the exhaust temperature of the air conditioning system rises within the second preset time, it is determined that the compressor has a problem of control failure.

[0011] Further, before real-time monitoring of the fault information of the compressor, it also includes: Detecting the ambient temperature of the air conditioning system, and judging whether the ambient temperature is less than a low temperature threshold; If so, detecting the operating mode of the air conditioning system; When the air conditioning system is in the heating mode, it is determined that the air conditioning system operates in a low temperature heating condition.

[0012] Further, the detection method for the compressor to have an overcurrent fault includes: Real-time monitoring of the instantaneous current of the compressor, and judging whether the instantaneous current of the compressor exceeds the current threshold; If so, it is determined that the compressor has an overcurrent fault.

[0013] Further, the detection method for the compressor to have an out-of-step fault includes: Detecting the actual rotation speed of the compressor during operation, and judging whether the actual rotation speed exceeds the rotation speed threshold range; If so, it is determined that the compressor has an out-of-step fault.

[0014] Further, before judging the rotor state of the compressor according to the operating parameters of the air conditioning system, it also includes: controlling the compressor to enter the open-loop drive mode.

[0015] Further, the open-loop drive mode includes: Setting the target frequency of the compressor to operate, and applying an external current to the compressor to make the compressor operate at the target frequency.

[0016] The present invention also provides an air conditioning system, which adopts the method for detecting the state of the compressor rotor in the above air conditioning system.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: The method for detecting the state of the compressor rotor provided by the present invention can judge whether there is a problem of rotor jamming in the compressor according to the operating parameters of the air conditioning system, and then accurately locate the fault position of the compressor, improving the subsequent maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is the overall flowchart of the method for detecting the state of the compressor rotor of the present invention; Figure 2 is the conversion diagram of the compressor in the normal start state of the present invention; Figure 3 is the conversion diagram of the self-check logic state when the compressor fails in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the following further describes the present invention in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0021] Therefore, a feature pointed out in this specification will be used to illustrate one feature of one embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features may be combined together to show possible system designs, these features can also be used in other combinations not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limiting.

[0022] The principle and structure of the present invention will be described in detail below with reference to the drawings and embodiments.

[0023] When the air conditioning system operates in the heating mode in an ultra-low temperature environment, the evaporation speed of the evaporator slows down, which will cause liquid refrigerant to enter the compressor, resulting in damage to the internal parts of the compressor, such as problems like rotor jamming of the compressor, causing the compressor to fail to start normally; However, the shutdown of the compressor is generally caused by various reasons. In the current technical solutions, the specific fault location of the compressor cannot be determined. As a result, after the compressor fails and shuts down, a large amount of work is required to detect one by one during subsequent maintenance, which affects the subsequent maintenance efficiency.

[0024] The design idea of the present invention is to determine whether the fault of the compressor is rotor jamming based on the fault information that appears when the compressor rotor jams and in combination with the changes in the operating parameters of the air-conditioning system that controls the compressor to enter the open-loop drive mode, thereby achieving accurate fault location.

[0025] Based on the above design idea, the method for detecting the state of the compressor rotor in the air-conditioning system proposed by the present invention includes the following steps: When the air-conditioning system operates in the low-temperature heating condition, the fault information of the compressor is monitored in real time; Judge whether the fault information of the compressor meets the preset threshold condition. If so, judge the rotor state of the compressor according to the operating parameters of the air-conditioning system.

[0026] As described above, the evaporation speed of the evaporator slows down, resulting in liquid refrigerant entering the compressor, and then causing the problem of rotor jamming in the compressor. Generally, it is in an ultra-low temperature environment. The idea of the present invention is to detect whether the compressor has the problem of rotor jamming. Therefore, before monitoring the fault information of the compressor, the present invention needs to ensure that the air-conditioning system is operating in the low-temperature heating condition (that is, in the heating mode in the ultra-low temperature environment described above); As for the judgment using the fault information of the compressor in the present invention, it is set according to the operating state of the compressor when the compressor rotor jams. Here, when the compressor rotor jams, the operating state of the compressor is: When a fault of rotor jamming occurs in the compressor, since the rotor cannot rotate and the load becomes smaller, a large current will be generated, and this current will exceed the current threshold. At this time, the compressor will first have an overcurrent fault; After this overcurrent fault appears, when the compressor is restarted, since the rotor of the compressor is jammed and cannot rotate, at this time, the control program of the compressor will judge that the actual speed of the compressor deviates too much from the set speed. At this time, the logic of out-of-step is met, and then an out-of-step fault is reported. At the same time, due to the rotor jamming of the compressor, even when the compressor is restarted again, the control program of the compressor will still judge that the actual speed of the compressor deviates too much from the set speed, that is, an out-of-step fault will be reported multiple times at this time; From the above records, it can be seen that after a fault of rotor jamming occurs in the compressor, the fault state that the compressor will present is that an overcurrent fault appears first, and then multiple out-of-step faults appear. The present invention uses this part of the characteristics as the fault information to judge whether the compressor has a fault of rotor jamming; However, the out-of-step fault of the compressor does not solely occur due to the rotor jamming of the compressor. When there is a problem with the compressor control failure, an out-of-step fault will also occur. Therefore, when performing the above judgment in the present invention, it does not directly determine that the compressor has a rotor jamming problem based on the fault information of the compressor. Instead, it further determines the rotor state of the compressor based on the operating parameters of the air-conditioning system, that is, as described above, the rotor state of the compressor is determined according to the operating parameters of the air-conditioning system; The control logic in this case is to inject current into the compressor to make it run. If the compressor can run, it indicates that the fault of the compressor is control failure. If the compressor cannot run normally, it indicates that the fault of the compressor is rotor jamming; Here, since the operation of the compressor will cause corresponding changes in the operating parameters of the air-conditioning system, the present invention can directly determine the rotor state of the compressor based on the operating parameters of the air-conditioning system; The above introduction is also the judgment logic corresponding to "when the air-conditioning system operates in the low-temperature heating condition, the fault information of the compressor is monitored in real time; Judge whether the fault information of the compressor meets the preset fault condition. If so, judge the rotor state of the compressor according to the operating parameters of the air-conditioning system" in the present invention.

[0027] As can be seen from the above analysis, after using the method for detecting the rotor state of the compressor in the air-conditioning system proposed by the present invention, the present invention can accurately determine whether the compressor has a rotor jamming fault, that is, the present invention can accurately locate the fault position of the compressor and improve the subsequent maintenance efficiency.

[0028] Furthermore, the fault information of the compressor in the present invention includes: the number of overcurrent faults and out-of-step faults that the compressor has occurred; Judging whether the fault information of the compressor meets the preset fault condition includes: Judging whether the number of out-of-step faults that the compressor has occurred within the first preset time reaches the preset number; If so, when there is an overcurrent fault before the compressor has an out-of-step fault, it is determined that the fault information of the compressor meets the preset fault condition.

[0029] This part of the judgment is the first layer of judgment in the present invention, that is, the judgment logic based on the fault information. As can be seen from the above introduction, when the compressor has a rotor jamming fault, there will be an overcurrent fault first, and then multiple out-of-step faults. The preset fault condition in the present invention corresponds to this judgment logic. Judging according to this preset fault condition can largely determine that the compressor fault is rotor jamming; The preset number of times here can be set according to actual needs. Generally, it can be set to 3 times. If the number of times is set too small, there may be misjudgment. If the number of times is set too large, the workload of judgment will increase. Similarly, the first preset time can also be set according to actual needs. Generally, it can be set to 15 minutes. If the time is set too short here, there may be a problem that the compressor has not restarted and the out-of-step fault has not been detected.

[0030] By adopting the above judgment logic, the present invention can initially filter out most fault types, providing convenience for subsequent judgment, and is used for accurately judging whether the compressor has a problem of rotor jamming subsequently.

[0031] Furthermore, the operating parameters of the air-conditioning system in the present invention include: the operating high pressure of the air-conditioning system, the operating low pressure of the air-conditioning system, and the exhaust temperature of the air-conditioning system. Judging the rotor state of the compressor according to the operating parameters of the air-conditioning system includes: Calculating the pressure difference between the operating high pressure and the operating low pressure of the air-conditioning system, and judging whether the pressure difference is less than a preset threshold; If so, judging whether the exhaust temperature of the air-conditioning system rises within a second preset time; When the exhaust temperature of the air-conditioning system does not rise within the second preset time, it is determined that the rotor of the compressor is jammed.

[0032] This part of the judgment logic is the second layer of judgment in the present invention. As described above, although after the problem of rotor jamming of the compressor occurs, its fault information is that an overcurrent fault appears first, and then multiple out-of-step faults appear, but the compressor presenting this fault situation (appearing an overcurrent fault first, and then multiple out-of-step faults) is not necessarily due to the problem of rotor jamming of the compressor. The out-of-step fault of the compressor may also be caused by control failure. Therefore, the present invention needs to perform the above second layer of judgment to further determine the fault of rotor jamming of the compressor.

[0033] In order to screen out the problem of control failure of the compressor, the solution of the present invention is to inject a current into the compressor, so as to make the compressor drive in open loop. In this case, the compressor is equivalent to being forced to run. Therefore, if the compressor can work normally in this case, it indicates that the fault of the compressor is control failure. Otherwise, it can be determined that the fault of the compressor is rotor jamming.

[0034] As can be seen from the previous records, the normal operation of the compressor will affect the operating parameters of the air-conditioning system. Therefore, when the present invention performs this second layer of judgment, it directly uses the operating parameters of the air-conditioning system for judgment. Here, the operating parameters of the air-conditioning system adopted in the present invention include: the operating high pressure of the air-conditioning system, the operating low pressure of the air-conditioning system, and the exhaust temperature of the air-conditioning system; The above operating parameters are all parameters that will change when the compressor is operating normally. For example, the operating high pressure of the air-conditioning system and the operating low pressure of the air-conditioning system. These two parameters can correspond to the pressure difference of the air-conditioning system. If the compressor is operating normally, this pressure difference will change. Here, the changed value is recorded as PΔa. Therefore, the present invention only needs to determine whether the change in the pressure difference reaches this PΔa to determine whether the compressor is operating normally. This PΔa is also the above-mentioned preset threshold; Similarly, when the compressor is operating normally, the exhaust temperature of the air-conditioning system will rise. Therefore, the present invention can also directly determine whether the compressor can operate normally at this time by whether the exhaust temperature of the air-conditioning system rises, so as to eliminate the problem of ineffective rising control; In the present invention, the judgment logics of the pressure difference and the exhaust temperature are in a progressive relationship, which is used to avoid misjudgment. When both the pressure difference and the exhaust temperature indicate that the compressor is not operating, it is determined that the compressor has a problem of rotor jamming at this time, ensuring the accuracy of the judgment; Since when the compressor is operating normally, the corresponding pressure difference of the air-conditioning system (the difference between the operating high pressure and the operating low pressure of the air-conditioning system) will exceed the preset threshold, it can be determined that the compressor is not operating when the pressure difference is less than the preset threshold; Similarly, when the compressor is operating normally, the corresponding exhaust temperature of the air-conditioning system will rise. Therefore, it can be determined that the compressor is not operating when the exhaust temperature does not rise; When both of the above two judgment logics determine that the compressor is not operating, it is determined that the fault of the compressor at this time is rotor jamming.

[0035] Based on the logic of judging that the compressor has rotor jamming, the present invention can also give the judgment logic of compressor control failure, which is the opposite of the judgment logic of compressor rotor jamming, that is: When the exhaust temperature of the air-conditioning system rises within the second preset time, it is determined that the compressor has a control failure problem.

[0036] Based on the above judgment logic, the present invention can accurately determine whether the compressor has a fault of rotor jamming, and can also determine whether the compressor has a problem of control failure, so as to accurately determine the location of the compressor fault and improve the subsequent maintenance efficiency.

[0037] Furthermore, as can be seen from the previous introduction, when the present invention further determines whether the compressor has a rotor jamming fault or a control failure fault, a current is provided to the compressor to drive the compressor to operate. This part of the control is also what is described in the previous text of the present invention: before determining the rotor state of the compressor according to the operating parameters of the air-conditioning system, it further includes: controlling the compressor to enter the open-loop driving mode; The open-loop driving mode here is also to provide a current to the compressor as described in the previous text to drive the compressor to operate.

[0038] The purpose of the present invention to control the compressor to enter the open-loop driving mode is to ensure the normal operation of the compressor. When the compressor has a control failure fault, the compressor essentially does not operate. By controlling the compressor to operate through this open-loop driving mode of the present invention, the influence of the control failure of the compressor on the above judgment can be avoided. At this time, whether the compressor operates normally is only related to whether the rotor of the compressor is jammed, that is, at this time, it is possible to directly judge whether the compressor has a rotor jamming fault based on the operating parameters of the air-conditioning system.

[0039] Among them, the specific action of the above open-loop driving mode is: Set the target frequency of the compressor to operate, and apply an external current to the compressor to make the compressor operate at the target frequency.

[0040] This step is also: injecting current into the compressor, setting the current loop target value, setting the target frequency, without a position observer (open-loop speed loop), driving the motor, please refer to Figure 3 In this case, the specific state switching process of the present invention is standby → offset voltage calculation → bootstrap capacitor charging → open-loop operation → end.

[0041] Please refer to Figure 2 Under normal circumstances, the state switching process of the compressor is standby → offset voltage calculation → bootstrap capacitor charging → positioning → high-frequency injection start → operation; The control method of the present invention adjusts the high-frequency injection start step. Therefore, when the compressor has a control failure fault, the upper computer cannot normally control the start of the compressor in this high-frequency injection start action. In the present invention, by using the above open-loop operation method, injecting current and driving the motor to operate, the normal operation of the compressor can be driven for the judgment of whether the rotor of the compressor is jammed.

[0042] This setting of the present invention is used to ensure the normal operation of the compressor, thereby avoiding the influence of the control failure of the compressor on the above judgment. At this time, whether the compressor operates normally is only related to whether the rotor of the compressor is jammed, that is, at this time, it is possible to directly judge whether the compressor has a rotor jamming fault based on the operating parameters of the air-conditioning system.

[0043] Please refer toFigure 1 This is the overall control flow of the present invention, where ta is the fault judgment time, that is, the first preset time in the previous text. The first preset time is used to determine whether the number of times the compressor has an out-of-step fault reaches the preset number of times; iPhsmiscnt is the number of times the compressor has an out-of-step fault; PmLimit is the preset number of times; iOccnt is the number of times the compressor has an overcurrent fault; tb is the second preset time, which is the acquisition delay time of the pressure difference and the exhaust temperature of the air-conditioning system, and is used to determine whether the exhaust temperature rises and whether the pressure difference is less than the preset threshold; Please refer to Figure 1 , and the specific steps are as follows: Judge whether it is in the ultra-low temperature heating mode; the ultra-low temperature heating mode here is also the low-temperature heating condition in the previous text. This step is also the judgment in the previous text on whether the ambient temperature of the air-conditioning system is less than the low-temperature threshold before real-time monitoring of the fault information of the compressor; Within the time of ta, judge that iPhsmiscnt > PmLimit; here ta is the first preset time, iPhsmiscnt is the number of times the compressor has an out-of-step fault, and PmLimit is the preset number of times. This step is also the judgment in the previous text within the first preset time on whether the number of times the compressor has an out-of-step fault reaches the preset number of times; Judge that iOccnt is true; here iOccnt is the number of times the compressor has an overcurrent fault, and iOccnt being true means that there is an overcurrent fault. This step is also the judgment in the previous text on whether there is an overcurrent fault before the compressor has an out-of-step fault; After receiving the start-up instruction again, operate in the open-loop drive mode; this step is also in the previous text, before judging the rotor state of the compressor according to the operating parameters of the air-conditioning system, controlling the compressor to enter the open-loop drive mode; Judge that after the time of tb, the high and low pressure differences and the exhaust temperature difference of the system meet the threshold settings; the high and low pressure differences here actually correspond to the pressure difference between the operating high pressure and the operating low pressure of the air-conditioning system, and the exhaust temperature difference is a value used to indicate whether the exhaust temperature of the air-conditioning system rises. If the exhaust temperature difference is greater than zero, it means that the exhaust temperature of the air-conditioning system rises, otherwise it means that the exhaust temperature of the air-conditioning system drops. This step is also the judgment in the previous text on whether the pressure difference is less than the preset threshold and on whether the exhaust temperature of the air-conditioning system rises within the second preset time; When the determination is yes, enter the characteristics of the composite rotor being stuck, and the digital tube displays the corresponding fault code. The fault does not recover and the unit cannot be powered on. This step is to determine that the compressor has a fault of the rotor being stuck. After the fault of the rotor being stuck occurs, the digital tube displays the fault code corresponding to the rotor being stuck, which is used to inform the type of fault of the compressor. Since the compressor has a fault of the rotor being stuck at this time, the compressor is controlled not to operate to avoid exacerbating the fault.

[0044] In the present invention, when any of the above judgment logics determines no, it enters the judgment logic of not conforming to the rotor being stuck, and processes it according to the processing method of other faults without performing special processing actions. This is because the design idea of the present invention mainly focuses on detecting the stuck rotor of the compressor, not that other fault types of the compressor cannot be judged according to the idea of the present invention. It can be easily found from the previous records that the present invention can at least also determine whether the compressor has a problem of control failure.

[0045] From the atta Figure 1 It can be clearly seen that according to the method for detecting the rotor state of the compressor in the air-conditioning system proposed by the present invention, it can accurately judge whether the compressor has a fault of the rotor being stuck, so as to accurately locate the fault position of the compressor and improve the subsequent maintenance efficiency.

[0046] According to the content recorded above, it can be found that when the present invention judges the fault information, it is necessary to record the number of times of overcurrent faults of the compressor and the number of times of out-of-step faults of the compressor. That is, when the present invention executes the above steps, it actually also needs to judge whether the compressor has overcurrent faults and out-of-step faults. In this regard, the present invention provides corresponding detection methods for the overcurrent fault of the compressor and the out-of-step fault of the compressor respectively, for detecting the number of times of overcurrent faults of the compressor and the number of times of out-of-step faults of the compressor; Specifically, the method for detecting the overcurrent fault of the compressor in the present invention is: Real-time monitor the instantaneous current of the compressor and judge whether the instantaneous current of the compressor exceeds the current threshold; If so, it is determined that the compressor has an overcurrent fault; The essence of this overcurrent fault is that the instantaneous current of the compressor increases and exceeds the current threshold, thus affecting the operation of the compressor. Therefore, in the present invention, only by real-time monitoring the instantaneous current of the compressor, it can be judged whether the compressor has an overcurrent fault; For the number of times of overcurrent faults of the compressor in the previous text, it can be judged according to the number of times the instantaneous current exceeds the current threshold. Each time the current threshold is exceeded, it is recorded as an overcurrent fault once. Then the present invention can well record the number of times of overcurrent faults of the compressor according to this method, and then be used for the judgment of whether the preset fault conditions are met; Similarly, the method for detecting the out-of-step fault of the compressor in the present invention is as follows: Detect the actual rotation speed of the compressor during operation, and determine whether the actual rotation speed exceeds the rotation speed threshold range; If so, it is determined that the compressor has an out-of-step fault.

[0047] This out-of-step fault means that the rotor position of the compressor cannot be detected suddenly during operation, or the deviation between the actual rotation speed and the set rotation speed during operation is too large. The present invention is set based on the large deviation between the actual rotation speed and the set rotation speed during operation. The rotation speed threshold range here is also the set rotation speed. If the compressor has a fault of rotor jamming, at this time, the rotation speed of the compressor will become zero and will surely not be within the rotation speed threshold range. Therefore, the present invention can determine whether the compressor has an out-of-step fault based on whether the actual rotation speed exceeds the rotation speed threshold range; For the number of times of the out-of-step fault of the compressor in the foregoing text, it can be set according to the number of times of detecting the actual rotation speed of the compressor. Each time the actual rotation speed of the compressor is detected to exceed the rotation speed threshold range, the occurrence of an out-of-step fault is recorded once. Then, the present invention can well record the number of times of the out-of-step fault of the compressor according to this method, and further use it for the judgment of whether the above preset fault conditions are met.

[0048] By using the above detection method of overcurrent fault and the detection method of out-of-step fault, the present invention can respectively obtain the number of times of out-of-step fault within the first preset time and whether there is an overcurrent fault before the occurrence of the out-of-step fault, and further use it to judge whether the fault information of the compressor meets the preset fault conditions.

[0049] In addition, since the method for detecting the rotor state of the compressor in the air-conditioning system proposed by the present invention needs to be executed under the low-temperature heating condition, the present invention also gives the judgment logic for this low-temperature heating condition, which is specifically as follows: Detect the ambient temperature of the air-conditioning system, and judge whether the ambient temperature is less than the low-temperature threshold; If so, detect the operating mode of the air-conditioning system; When the air-conditioning system is in the heating mode, it is determined that the air-conditioning system operates under the low-temperature heating condition.

[0050] Based on this setting, the present invention can ensure that the air-conditioning system enters the low-temperature heating condition, thereby ensuring the accuracy of the above judgment of rotor jamming of the compressor.

[0051] Based on the above method for detecting the rotor state of the compressor in the air-conditioning system, the present invention also proposes an air-conditioning system, which has the above method for detecting the rotor state of the compressor in the air-conditioning system.

[0052] Among them, to implement the above detection of the rotor state of the compressor, the air-conditioning system at least has the following modules: Detection module: It is used to detect the operating high pressure of the air conditioning system, the operating low pressure of the air conditioning system, the exhaust temperature of the air conditioning system, the instantaneous current of the compressor, and the actual speed of the compressor; Judgment module, which is used to judge whether the compressor has an overcurrent fault according to the instantaneous current of the compressor and record the number of overcurrent faults, is also used to judge whether the compressor has a step-out fault according to the actual speed of the compressor and record the number of step-out faults, and is used to calculate the pressure difference according to the operating high pressure and the operating low pressure of the air conditioning system, and combine the exhaust temperature of the air conditioning system to judge whether the compressor has a rotor jamming fault; Main control module, which is used to integrate the information of the detection module and the judgment module, and perform corresponding control on the compressor, such as stopping, maintaining operation, adjusting the actual speed, etc.

[0053] According to the above settings, the air conditioning system proposed by the present invention can execute the compressor rotor state detection method in the air conditioning system as described above, so as to accurately locate the compressor fault position.

[0054] In summary, compared with the prior art, the present invention has at least the following beneficial effects: The compressor rotor state detection method proposed by the present invention can judge whether the compressor has a rotor jamming problem according to the operating parameters of the air conditioning system, and then accurately locate the compressor fault position, improving the subsequent maintenance efficiency.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for detecting the state of a compressor rotor in an air-conditioning system, characterized in that, Including: When the air-conditioning system operates in the low-temperature heating condition, the fault information of the compressor is monitored in real time; Judge whether the fault information of the compressor meets the preset fault conditions. If so, judge the rotor state of the compressor according to the operating parameters of the air-conditioning system.

2. The method for detecting the state of the compressor rotor in the air conditioning system according to claim 1, characterized in that The fault information of the compressor includes: the number of overcurrent faults and out-of-step faults that the compressor has experienced; Judging whether the fault information of the compressor meets the preset fault conditions includes: Judging whether the number of out-of-step faults of the compressor reaches the preset number within the first preset time; If so, when there is an overcurrent fault before the compressor has an out-of-step fault, it is determined that the fault information of the compressor meets the preset fault conditions.

3. The method for detecting the state of a compressor rotor in the air-conditioning system according to claim 1, wherein The operating parameters of the air-conditioning system include: the operating high pressure of the air-conditioning system, the operating low pressure of the air-conditioning system, and the exhaust temperature of the air-conditioning system; Judging the rotor state of the compressor according to the operating parameters of the air-conditioning system includes: Calculate the pressure difference between the operating high pressure and the operating low pressure of the air-conditioning system, and judge whether the pressure difference is less than the preset threshold; If so, judge whether the exhaust temperature of the air-conditioning system rises within the second preset time; When the exhaust temperature of the air-conditioning system does not rise within the second preset time, it is determined that the rotor of the compressor is stuck.

4. The method for detecting the state of the compressor rotor in the air conditioning system according to claim 3, characterized in that, When the pressure difference is greater than the preset threshold and / or the exhaust temperature of the air-conditioning system rises within the second preset time, it is determined that there is a problem of control failure of the compressor.

5. The method for detecting the state of the compressor rotor in the air conditioning system according to claim 1, characterized in that, Before monitoring the fault information of the compressor in real time, it also includes: Detect the ambient temperature of the air-conditioning system, and judge whether the ambient temperature is less than the low-temperature threshold; If so, detect the operating mode of the air-conditioning system; When the air-conditioning system is in the heating mode, it is determined that the air-conditioning system operates in the low-temperature heating condition.

6. The method for detecting the state of the compressor rotor in the air-conditioning system according to claim 2, characterized in that, The detection method for the compressor to have an overcurrent fault includes: Monitor the instantaneous current of the compressor in real time, and judge whether the instantaneous current of the compressor exceeds the current threshold; If so, it is determined that the compressor has an overcurrent fault.

7. The method for detecting the state of the compressor rotor in the air conditioning system according to claim 2, characterized in that, The detection method for the compressor to have an out-of-step fault includes: Detect the actual speed of the compressor during operation, and judge whether the actual speed exceeds the speed threshold range; If so, it is determined that the compressor has an out-of-step fault.

8. The method for detecting the state of a compressor rotor in the air conditioning system according to claim 1, wherein, Before judging the rotor state of the compressor according to the operating parameters of the air-conditioning system, it also includes: controlling the compressor to enter the open-loop drive mode.

9. The method for detecting the state of the compressor rotor in the air-conditioning system according to claim 8, characterized in that, The open-loop drive mode includes: Set the target frequency for the compressor to operate, and apply an external current to the compressor to make the compressor operate at the target frequency.

10. An air conditioning system, characterized in that, The air-conditioning system adopts the compressor rotor state detection method in the air-conditioning system according to any one of claims 1 to 9.

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