Method and device for judging absence of air conditioner refrigerant, and air conditioner

Abstract

The application relates to the technical field of judging air conditioner refrigerant deficiency, and discloses a method for judging air conditioner refrigerant deficiency. The method comprises the following steps: after the running state of an air conditioner meets stable running conditions, the opening degree of a throttling valve is the first opening degree at a first time, and the first discharge pressure and / or the first discharge temperature of a compressor are obtained; the opening degree of the throttling valve is the second opening degree at a second time, and the second discharge pressure and / or the second discharge temperature of the compressor are obtained; the first discharge pressure difference between the second discharge pressure and the first discharge pressure is obtained, and / or the first discharge temperature difference between the second discharge temperature and the first discharge temperature is obtained; and in the case that the first discharge pressure difference is greater than a set discharge pressure threshold value and / or the first discharge temperature difference is greater than a set discharge temperature threshold value, it is determined that the air conditioner refrigerant is deficient. The method can improve the accuracy of the judgment result. The application further discloses a device for judging air conditioner refrigerant deficiency and an air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of judging refrigerant absence of an air conditioner, for example, to a refrigerant absence judging method and device of an air conditioner. BACKGROUND

[0002] At present, the refrigerant medium in the air conditioning system is mainly fluorine-containing compounds, which has the characteristics of easy evaporation and easy liquefaction. When evaporated, it absorbs heat, and when liquefied, it releases heat. The air conditioner utilizes this characteristic to realize the transmission of energy, so as to achieve the purpose of refrigeration and heating. However, refrigerant absence is also a common fault in the use of air conditioners. Taking fluorine-containing compounds as an example, if the air conditioner continues to run after the fluorine is absent, the refrigeration and heating effect will be poor, affecting the user's use.

[0003] In the process of implementing the embodiments of the present application, it is found that at least the following problems exist in the related art:

[0004] The refrigerant absence condition is easily determined as the refrigerant absence condition, thereby causing false positives.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those skilled in the art. SUMMARY

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general review, nor is it intended to determine the key / important elements or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0007] The embodiments of the present application provide a refrigerant absence judging method of an air conditioner to improve the accuracy of the judgment result of whether the refrigerant is absent.

[0008] In some embodiments, the refrigerant absence judging method of an air conditioner comprises: after the running state of the air conditioner meets the stable running condition, setting the opening degree of the throttling valve to the first opening degree at the first time, and obtaining the first discharge pressure and / or the first discharge temperature of the compressor;

[0009] The opening degree of the throttle valve is the second opening degree at the second time, and the second discharge pressure and / or the second discharge temperature of the compressor are obtained; a first discharge pressure difference between the second discharge pressure and the first discharge pressure is obtained, and / or a first discharge temperature difference between the second discharge temperature and the first discharge temperature is obtained; in a case where the first discharge pressure difference is greater than a set discharge pressure threshold value and / or the first discharge temperature difference is greater than a set discharge temperature threshold value, it is determined that the refrigerant of the air conditioner is missing; the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge pressure threshold value, and the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge temperature threshold value.

[0010] Optionally, the determination that the operating state of the air conditioner satisfies the stable operating condition comprises: obtaining an actual discharge pressure and an actual discharge temperature of the compressor; obtaining a set discharge pressure and a set discharge temperature of the compressor; and in a case where the actual discharge pressure satisfies a constraint condition of the set discharge pressure and the actual discharge temperature satisfies a constraint condition of the set discharge temperature, it is determined that the operating state of the air conditioner satisfies the stable operating condition.

[0011] Optionally, the determination that the actual discharge pressure satisfies the constraint condition of the set discharge pressure comprises: obtaining a second discharge pressure difference between the set discharge pressure and the actual discharge pressure; and in a case where the second discharge pressure difference is less than or equal to a set discharge pressure difference value, it is determined that the actual discharge pressure satisfies the constraint condition of the set discharge pressure.

[0012] Optionally, the determination that the actual discharge temperature satisfies the constraint condition of the set discharge temperature comprises: obtaining a second discharge temperature difference between the set discharge temperature and the actual discharge temperature; and in a case where the second discharge temperature difference is less than or equal to a set discharge temperature difference value, it is determined that the actual discharge temperature satisfies the constraint condition of the set discharge temperature.

[0013] Optionally, the obtaining of the actual discharge pressure and the actual discharge temperature of the compressor comprises: obtaining an actual operating frequency of the compressor and an actual rotating speed of the fan; and in a case where the compressor maintains the actual operating frequency unchanged for a duration greater than or equal to a first set duration and the fan maintains the actual rotating speed unchanged for a duration greater than or equal to a second set duration, the actual discharge pressure and the actual discharge temperature of the air conditioner are obtained.

[0014] Optionally, the method for judging whether the refrigerant of the air conditioner is missing further comprises: in a case where the actual discharge pressure does not satisfy the constraint condition of the set discharge pressure and / or the actual discharge temperature does not satisfy the constraint condition of the set discharge temperature, it is determined that the operating state of the air conditioner does not satisfy the stable operating condition.

[0015] Optionally, the method for judging the absence of air conditioner refrigerant further comprises: determining that the air conditioner refrigerant is not absent in a case where the first exhaust pressure difference is less than or equal to a set exhaust pressure threshold value, and / or, the first exhaust temperature difference is less than or equal to a set exhaust temperature threshold value.

[0016] In some embodiments, the device for judging the absence of air conditioner refrigerant comprises a first obtaining module, a second obtaining module, a third obtaining module and a first determining module.

[0017] The first obtaining module is configured to, after the operating state of the air conditioner meets the stable operating condition, make the opening degree of the throttling valve be the first opening degree at the first time, and obtain the first exhaust pressure and / or the first exhaust temperature of the compressor.

[0018] The second obtaining module is configured to make the opening degree of the throttling valve be the second opening degree at the second time, and obtain the second exhaust pressure and / or the second exhaust temperature of the compressor.

[0019] The third obtaining module is configured to obtain the first exhaust pressure difference between the second exhaust pressure and the first exhaust pressure, and obtain the first exhaust temperature difference between the second exhaust temperature and the first exhaust temperature.

[0020] The first determining module is configured to determine that the air conditioner refrigerant is absent in a case where the first exhaust pressure difference is greater than a set exhaust pressure threshold value, and / or, the first exhaust temperature difference is greater than a set exhaust temperature threshold value; the opening degree difference between the second opening degree and the first opening degree corresponds to the set exhaust pressure threshold value, and the opening degree difference between the second opening degree and the first opening degree corresponds to the set exhaust temperature threshold value.

[0021] In some embodiments, the device for judging the absence of air conditioner refrigerant comprises a processor and a memory storing program instructions, and the processor is configured to execute the program instructions to execute the method for judging the absence of air conditioner refrigerant provided in the foregoing embodiments.

[0022] In some embodiments, the air conditioner comprises the device for judging the absence of air conditioner refrigerant provided in the foregoing embodiments.

[0023] The method for judging the absence of air conditioner refrigerant, the device for judging the absence of air conditioner refrigerant and the air conditioner provided in the embodiments of the present application can achieve the following technical effects:

[0024] The opening degree of the throttling valve at the first time is the first opening degree, the opening degree of the throttling valve at the second time is the second opening degree, and there is an opening degree difference between the first opening degree and the second opening degree, that is, the opening degree of the throttling valve is adjusted from the first time to the second time.

[0025] Corresponding to the opening adjustment of the throttle valve, the relevant external parameter of the compressor is adjusted to the first exhaust pressure and / or the first exhaust temperature when the throttle valve is at the first opening, and the relevant external parameter of the compressor is adjusted to the second exhaust pressure and / or the second exhaust temperature when the throttle valve is at the second opening, that is, corresponding to the opening adjustment of the throttle valve, the relevant external parameter of the compressor is also adjusted.

[0026] In the process of simultaneous change of the opening of the throttle valve and the relevant external parameter of the compressor, the amount of refrigerant in the air conditioner is reflected by the corresponding relationship between the adjustment degree of the relevant external parameter of the compressor and the adjustment degree of the opening of the throttle valve:

[0027] That is:

[0028] The opening difference between the second opening and the first opening corresponds to the set exhaust pressure threshold value, and / or the opening difference between the second opening and the first opening corresponds to the set exhaust temperature threshold value;

[0029] If the corresponding relationship between the adjustment degree of the relevant external parameter of the compressor and the adjustment degree of the opening of the throttle valve is that the first exhaust pressure threshold value (the adjustment degree of the relevant external parameter of the compressor) is greater than the set exhaust pressure threshold value (the adjustment degree of the opening of the throttle valve), it is determined that the refrigerant of the air conditioner is missing.

[0030] The corresponding relationship between the adjustment degree of the relevant external parameter of the compressor and the adjustment degree of the opening of the throttle valve belongs to a corresponding relationship with relative significance generated by the air conditioner in dynamic operation, that is, even if the refrigerant of the air conditioner is not effectively dredged, such as flow path blockage, compressor failure, circuit failure, etc., the above-mentioned corresponding relationship is not easily affected, and the amount of refrigerant in the air conditioner can be more accurately reflected. Ultimately, the accuracy of the judgment result of the refrigerant missing is improved, and the occurrence of false positives is reduced.

[0031] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitation on the embodiments, and elements with the same reference numerals in the drawings are considered as similar elements, and wherein:

[0033] Figure 1 is a flow diagram of an air conditioner refrigerant missing judgment method provided by an embodiment of the present application;

[0034] Figure 2 is a flow diagram of an air conditioner refrigerant missing judgment method provided by an embodiment of the present application;

[0035] Figure 3is a flowchart of a method for judging refrigerant deficiency of an air conditioner provided by an embodiment of the present application;

[0036] Figure 4 is a flowchart of a method for judging refrigerant deficiency of an air conditioner provided by an embodiment of the present application;

[0037] Figure 5 is a flowchart of a method for judging refrigerant deficiency of an air conditioner provided by an embodiment of the present application;

[0038] Figure 6 is a schematic diagram of a device for judging refrigerant deficiency of an air conditioner provided by an embodiment of the present application;

[0039] Figure 7 is a schematic diagram of a device for judging refrigerant deficiency of an air conditioner provided by an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to enable a person skilled in the art to more fully understand the features and technical content of the embodiments of the present application, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are used only for reference and do not limit the embodiments of the present application. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0041] The terms "first", "second", and the like in the specification and claims of the embodiments of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0042] Unless otherwise specified, the term "a plurality of" means two or more.

[0043] In the embodiments of the present application, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B represents: A or B.

[0044] The term "and / or" is a description of the relationship between the objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, three relationships.

[0045] In the embodiment of the present application, the corresponding relationship between the adjustment degree of the related external parameter of the compressor and the adjustment degree of the opening degree of the throttle valve is used to reflect the refrigerant amount in the air conditioner. Since the corresponding relationship is obtained in the dynamic adjustment process of the air conditioner, the corresponding relationship is not easily affected by other hardware faults, such as flow path blockage, compressor failure, circuit failure, and the like, thereby improving the accuracy of the refrigerant loss determination result.

[0046] Figure 1 FIG. 1 is a flowchart of an air conditioner refrigerant loss determination method according to an embodiment of the present application. The air conditioner refrigerant loss determination method can be implemented in a controller of the air conditioner itself or in another control device independent of the air conditioner.

[0047] In combination with FIG. 1, Figure 1 As shown in FIG. 1, the air conditioner refrigerant loss determination method includes the following steps.

[0048] S101, after the operating state of the air conditioner meets the stable operating condition, the opening degree of the throttle valve is set to a first opening degree at a first time, and the first discharge pressure and / or the first discharge temperature of the compressor are obtained.

[0049] The operating state of the air conditioner meeting the stable operating condition is used to reduce the influence of other executing components in the air conditioner except the throttle valve on the discharge pressure and / or the discharge temperature of the compressor during the process of adjusting the first opening degree of the throttle valve at the first time to a second opening degree at a second time, so as to make the corresponding relationship between the adjustment degree of the related external parameter of the compressor and the adjustment degree of the opening degree of the throttle valve in the subsequent steps more closely; and further make the corresponding relationship between the adjustment degree of the related external parameter of the compressor and the adjustment degree of the opening degree of the throttle valve be able to reflect the refrigerant amount in the air conditioner.

[0050] The other executing components in the air conditioner except the throttle valve include, but are not limited to, the compressor, the fan, and the opening degree of the air deflector.

[0051] The first time is calibrated at the time when the operating state of the air conditioner meets the stable operating condition.

[0052] S102, the opening degree of the throttle valve is set to a second opening degree at a second time, and the second discharge pressure and / or the second discharge temperature of the compressor are obtained.

[0053] The second opening degree is not equal to the first opening degree, and the second opening degree can be greater than the first opening degree or less than the first opening degree.

[0054] The second time is calibrated at the time when the operating state of the air conditioner meets the stable operating condition.

[0055] S103, obtaining a first exhaust pressure difference value of the second exhaust pressure and the first exhaust pressure, and obtaining a first exhaust temperature difference value of the second exhaust temperature and the first exhaust temperature.

[0056] S104, determining that the air conditioner refrigerant is missing, when the first exhaust pressure difference value is greater than a set exhaust pressure threshold value, and / or, the first exhaust temperature difference value is greater than a set exhaust temperature threshold value.

[0057] The opening difference value of the second opening and the first opening corresponds to the set exhaust pressure threshold value, and the opening difference value of the second opening and the first opening corresponds to the set exhaust temperature threshold value.

[0058] The corresponding relationship between the opening difference value of the second opening and the first opening and the set exhaust pressure threshold value can be obtained by trial.

[0059] The corresponding relationship between the opening difference value of the second opening and the first opening and the set exhaust temperature threshold value can be obtained by trial.

[0060] For example, for any type of air conditioner, set the refrigerant amount to a critical value of refrigerant missing or not missing, that is, if the refrigerant amount exceeds the critical value, it means that the air conditioner does not lack refrigerant, and if the refrigerant amount is lower than the critical value, it means that the air conditioner lacks refrigerant. In this case, after the operating state of the air conditioner meets the stable operation condition, the opening of the throttling valve is the first opening at the first time, the first exhaust pressure and / or the first exhaust temperature of the compressor are obtained, the opening of the throttling valve is the second opening at the second time, and the second exhaust pressure and / or the second exhaust temperature of the compressor are obtained, and then the exhaust pressure difference value of the second exhaust pressure and the first exhaust pressure is calculated, and the exhaust pressure difference value is taken as the set exhaust pressure threshold value, and / or, the exhaust temperature difference value of the second exhaust temperature and the first exhaust temperature is obtained, and the exhaust temperature difference value is taken as the first set exhaust temperature threshold value.

[0061] The above is only an example of obtaining the set exhaust pressure threshold value and the set exhaust temperature threshold value, and those skilled in the art can also obtain the set exhaust pressure threshold value and the set exhaust temperature threshold value based on the content in the embodiments of the present application by simulation, model calculation, etc. Here, it is not repeated.

[0062] The corresponding relationship between the opening difference value and the set exhaust pressure threshold value, and / or, the corresponding relationship between the opening difference value and the set exhaust temperature threshold value can exist in the database, and after obtaining the opening difference value of the second opening and the first opening, the set exhaust pressure threshold value and / or the set exhaust temperature threshold value can be obtained by querying the database.

[0063] Alternatively, in the case where the correspondence between the opening difference value and the set exhaust pressure threshold value is expressed in the form of a formula, and / or in the case where the correspondence between the opening difference value and the set exhaust temperature threshold value is expressed in the form of a formula, the formula can be stored in advance, and after the opening difference value of both the second opening and the first opening is obtained, the opening difference value is substituted into the formula, so that the set exhaust pressure threshold value and / or the set exhaust temperature threshold value can be obtained.

[0064] The opening of the throttle valve at the first time is the first opening, the opening of the throttle valve at the second time is the second opening, and there is an opening difference value between the first opening and the second opening, that is, the opening of the throttle valve is adjusted from the first time to the second time.

[0065] Corresponding to the adjustment of the opening of the throttle valve, the relevant external parameter of the compressor is the first exhaust pressure and / or the first exhaust temperature when the throttle valve is the first opening, and the relevant external parameter of the compressor is the second exhaust pressure and / or the second exhaust temperature when the throttle valve is the second opening, that is, corresponding to the adjustment of the opening of the throttle valve, the relevant external parameter of the compressor is also adjusted.

[0066] In the process that the opening of the throttle valve and the relevant external parameter of the compressor change simultaneously, the amount of refrigerant in the air conditioner is reflected by the correspondence between the adjustment degree of the relevant external parameter of the compressor and the adjustment degree of the opening of the throttle valve:

[0067] That is:

[0068] The opening difference value of both the second opening and the first opening corresponds to the set exhaust pressure threshold value, and / or the opening difference value of both the second opening and the first opening corresponds to the set exhaust temperature threshold value;

[0069] If the correspondence between the adjustment degree of the relevant external parameter of the compressor and the adjustment degree of the opening of the throttle valve is that the first exhaust pressure threshold value (the adjustment degree of the relevant external parameter of the compressor) is greater than the set exhaust pressure threshold value (the adjustment degree of the opening of the throttle valve), it is determined that the refrigerant of the air conditioner is missing.

[0070] The correspondence between the adjustment degree of the relevant external parameter of the compressor and the adjustment degree of the opening of the throttle valve is related to the dynamic running process of the air conditioner, and is irrelevant to some static parameters of the air conditioner, that is, for example, the above-mentioned correspondence is irrelevant to the fact that the refrigerant of the air conditioner is not effectively unblocked, even if the refrigerant of the air conditioner is not effectively unblocked, such as flow path blockage, compressor failure, circuit failure, etc., the above-mentioned correspondence is not easily affected, and can accurately reflect the amount of refrigerant of the air conditioner. Ultimately, the accuracy of the judgment result of the refrigerant missing is improved, and the occurrence of false positives is reduced.

[0071] The embodiments of the present application can include the following three implementation manners:

[0072] The first implementation manner is as follows: after the running state of the air conditioner meets the stable running condition, the opening degree of the throttling valve is the first opening degree at the first time, and the first discharge temperature of the compressor is obtained; the opening degree of the throttling valve is the second opening degree at the second time, and the second discharge temperature of the compressor is obtained; the first discharge temperature difference between the second discharge temperature and the first discharge temperature is obtained; in the case that the first discharge temperature difference is greater than the set discharge temperature threshold, it is determined that the refrigerant of the air conditioner is missing; the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge temperature threshold.

[0073] The second implementation manner is as follows: after the running state of the air conditioner meets the stable running condition, the opening degree of the throttling valve is the first opening degree at the first time, and the first discharge pressure of the compressor is obtained; the opening degree of the throttling valve is the second opening degree at the second time, and the second discharge pressure of the compressor is obtained; the first discharge pressure difference between the second discharge pressure and the first discharge pressure is obtained; in the case that the first discharge pressure difference is greater than the set discharge pressure threshold, it is determined that the refrigerant of the air conditioner is missing; the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge pressure threshold.

[0074] The third implementation manner is as follows: after the running state of the air conditioner meets the stable running condition, the opening degree of the throttling valve is the first opening degree at the first time, and the first discharge pressure and the first discharge temperature of the compressor are obtained; the opening degree of the throttling valve is the second opening degree at the second time, and the second discharge pressure and the second discharge temperature of the compressor are obtained; the first discharge pressure difference between the second discharge pressure and the first discharge pressure is obtained, and the first discharge temperature difference between the second discharge temperature and the first discharge temperature is obtained; in the case that the first discharge pressure difference is greater than the set discharge pressure threshold and the first discharge temperature difference is greater than the set discharge temperature threshold, it is determined that the refrigerant of the air conditioner is missing; the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge pressure threshold, and the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge temperature threshold.

[0075] The description of "and / or" in the subsequent embodiments contains the above-mentioned three implementation manners, which will not be described one by one. Based on the above-mentioned three implementation manners, a person skilled in the art can determine the three implementation manners contained in the description of "and / or" in the subsequent embodiments.

[0076] Compared with the first implementation manner and the second implementation manner, the third implementation manner can make the determination result of whether the refrigerant is abnormal more accurate.

[0077] Figure 2 FIG. 1 is a flowchart of an air conditioner refrigerant missing determination method provided by an embodiment of the present application. The air conditioner refrigerant missing determination method can be implemented in a controller of the air conditioner itself or in other control devices independent of the air conditioner.

[0078] In combination withFigure 2 As shown in the figure, the air conditioner refrigerant deficiency determination method comprises:

[0079] S201, after the running state of the air conditioner meets the stable running condition, the opening degree of the throttling valve is the first opening degree at the first time, and the first discharge pressure and / or the first discharge temperature of the compressor are obtained.

[0080] S202, the opening degree of the throttling valve is the second opening degree at the second time, and the second discharge pressure and / or the second discharge temperature of the compressor are obtained.

[0081] S203, the first discharge pressure difference value of the second discharge pressure and the first discharge pressure is obtained, and the first discharge temperature difference value of the second discharge temperature and the first discharge temperature is obtained.

[0082] S204, in the case that the first discharge pressure difference value is greater than the set discharge pressure threshold value, and / or the first discharge temperature difference value is greater than the set discharge temperature threshold value, it is determined that the air conditioner refrigerant is deficient.

[0083] S205, in the case that the first discharge pressure difference value is less than or equal to the set discharge pressure threshold value, and / or the first discharge temperature difference value is less than or equal to the set discharge temperature threshold value, it is determined that the air conditioner refrigerant is not deficient.

[0084] The opening degree difference value of the second opening degree and the first opening degree corresponds to the set discharge pressure threshold value, and the opening degree difference value of the second opening degree and the first opening degree corresponds to the set discharge temperature threshold value.

[0085] Figure 3 It is a flowchart of an air conditioner refrigerant deficiency determination method provided by the embodiment of the application, which is used to exemplarily illustrate the determination manner of the running state of the air conditioner meeting the stable running condition.

[0086] In combination with Figure 3 As shown in the figure, the air conditioner refrigerant deficiency determination method comprises:

[0087] S301, the actual discharge pressure and the actual discharge temperature of the compressor are obtained.

[0088] S302, the set discharge pressure and the set discharge temperature of the compressor are obtained.

[0089] The set discharge pressure is positively correlated with the running frequency of the compressor, the greater the running frequency of the compressor, the greater the set discharge pressure; the smaller the running frequency of the compressor, the smaller the set discharge pressure.

[0090] The set discharge temperature is positively correlated with the running frequency of the compressor, the greater the running frequency of the compressor, the higher the set discharge temperature, the smaller the running frequency of the compressor, the lower the set discharge temperature.

[0091] S303, in a case where the actual exhaust pressure meets the constraint condition of the set exhaust pressure and the actual exhaust temperature meets the constraint condition of the set exhaust temperature, it is determined that the running state of the air conditioner meets the stable running condition.

[0092] The actual exhaust pressure meeting the constraint condition of the set exhaust pressure and the actual exhaust temperature meeting the constraint condition of the set exhaust temperature mean that the compressor is neither in a high-pressure state nor in a low-pressure state.

[0093] On this basis, the determination that the actual exhaust pressure meets the constraint condition of the set exhaust pressure can include: obtaining a second exhaust pressure difference value of the set exhaust pressure and the actual exhaust pressure; and in a case where the second exhaust pressure difference value is less than or equal to the set exhaust pressure difference value, it is determined that the actual exhaust pressure meets the constraint condition of the set exhaust pressure.

[0094] Alternatively, the determination that the actual exhaust temperature meets the constraint condition of the set exhaust temperature includes: obtaining a second exhaust temperature difference value of the set exhaust temperature and the actual exhaust temperature; and in a case where the second exhaust temperature difference value is less than or equal to the set exhaust temperature difference value, it is determined that the actual exhaust temperature meets the constraint condition of the set exhaust temperature.

[0095] S304, at a first time, the opening degree of the throttling valve is the first opening degree, and the first exhaust pressure and / or the first exhaust temperature of the compressor are obtained.

[0096] S305, at a second time, the opening degree of the throttling valve is the second opening degree, and the second exhaust pressure and / or the second exhaust temperature of the compressor are obtained.

[0097] S306, a first exhaust pressure difference value of the second exhaust pressure and the first exhaust pressure is obtained, and / or a first exhaust temperature difference value of the second exhaust temperature and the first exhaust temperature is obtained.

[0098] When the running state of the air conditioner meets the stable running condition, the running frequency of the compressor of the air conditioner and the first opening degree and the second opening degree have the following corresponding relationship: in the process of adjusting the throttling valve from the first opening degree to the second opening degree when the running state of the air conditioner meets the stable running condition, the first exhaust pressure difference value of the second exhaust pressure and the first exhaust pressure and / or the first exhaust temperature difference value of the second exhaust temperature and the first exhaust temperature caused by the process is able to be obviously identified, for example, the first exhaust pressure difference value is greater than or equal to a set identifiable pressure difference value, and / or the first exhaust temperature difference value is greater than or equal to a set identifiable temperature difference value.

[0099] The set identifiable pressure difference value and / or the set identifiable temperature difference value can be determined by a person skilled in the art according to the actual situation, for example:

[0100] The greater the pressure difference between the rated maximum exhaust pressure and the rated minimum exhaust pressure of the air conditioner, the greater the set identifiable pressure difference can be; the smaller the pressure difference between the rated maximum pressure and the rated minimum pressure of the air conditioner, the smaller the set identifiable pressure difference can be.

[0101] The greater the temperature difference between the rated maximum exhaust temperature and the rated minimum exhaust temperature of the air conditioner, the greater the set identifiable temperature difference can be; the smaller the temperature difference between the rated maximum exhaust temperature and the rated minimum exhaust temperature of the air conditioner, the smaller the set identifiable temperature difference can be.

[0102] S307, in the case that the first exhaust pressure difference is greater than the set exhaust pressure threshold, and / or the first exhaust temperature difference is greater than the set exhaust temperature threshold, it is determined that the refrigerant of the air conditioner is missing.

[0103] The opening difference between the second opening and the first opening corresponds to the set exhaust pressure threshold, and the opening difference between the second opening and the first opening corresponds to the set exhaust temperature threshold.

[0104] Figure 4 is a flowchart of an air conditioner refrigerant missing judgment method provided by the embodiments of the present application. The air conditioner refrigerant missing judgment method can be implemented in the controller of the air conditioner itself, or in other control devices independent of the air conditioner.

[0105] S401, the actual operating frequency of the compressor and the actual rotating speed of the fan are obtained.

[0106] S402, in the case that the actual operating frequency of the compressor is maintained unchanged and the duration is greater than or equal to a first set duration, and the actual rotating speed of the fan is maintained unchanged and the duration is greater than or equal to a second set duration, the actual exhaust pressure and the actual exhaust temperature of the air conditioner are obtained.

[0107] The compressor maintains the actual operating frequency unchanged and lasts for the first set duration, and the exhaust pressure and / or the exhaust temperature of the compressor has been stabilized. The fan maintains the actual rotating speed unchanged and lasts for the second set duration, and the exhaust pressure and / or the exhaust temperature of the compressor has been stabilized. The skilled in the art can determine appropriate first set duration and second set duration according to the actual operating condition of the air conditioner, so that the exhaust pressure and / or the exhaust temperature of the compressor has been stabilized.

[0108] S403, the set exhaust pressure and the set exhaust temperature of the compressor are obtained.

[0109] S404, in the case that the actual exhaust pressure meets the constraint condition of the set exhaust pressure, and the actual exhaust temperature meets the constraint condition of the set exhaust temperature, it is determined that the operating state of the air conditioner meets the stable operating condition.

[0110] In the case that the actual exhaust pressure does not satisfy the constraint condition of the set exhaust pressure, and / or, the actual exhaust temperature does not satisfy the constraint condition of the set exhaust temperature, it is determined that the operation state of the air conditioner does not satisfy the stable operation condition.

[0111] If the set exhaust pressure is less than the actual exhaust pressure, it is determined that the compressor is in a high pressure state, and the compressor is stopped. On this basis, the air conditioner can also be caused to enter a high pressure protection alarm.

[0112] If the set exhaust pressure is greater than the actual exhaust pressure, it is determined that the compressor is in a low pressure state, and the compressor is stopped. On this basis, the air conditioner can also be caused to enter a low pressure protection alarm.

[0113] S405, at a first time, the opening degree of the throttling valve is the first opening degree, and the first exhaust pressure and / or the first exhaust temperature of the compressor are obtained.

[0114] S406, at a second time, the opening degree of the throttling valve is the second opening degree, and the second exhaust pressure and / or the second exhaust temperature of the compressor are obtained.

[0115] The first time and the second time are both calibrated at the time when the operation state of the air conditioner satisfies the stable operation condition. For example, the time when the operation state of the air conditioner satisfies the stable operation condition is t0, the time when the opening degree of the throttling valve reaches the first opening degree is t1, and the time when the opening degree of the throttling valve reaches the second opening degree is t2, then the first time is (t1-t0), and the second time is (t2-t0).

[0116] During the process that the throttling valve is at the first opening degree, before the second time, the exhaust pressure and / or the exhaust temperature of the compressor have been stabilized. For example, the exhaust pressure and / or the exhaust temperature of the compressor have been stabilized in the case that two or more exhaust pressures and / or exhaust temperatures of the compressor are continuously detected, and the difference between each adjacent two exhaust pressures and / or exhaust temperatures of the compressor can be ignored. Here, only the determination manner of the exhaust pressure and / or the exhaust temperature of the compressor having been stabilized is exemplarily described, and the specific determination process is not substantially limited, and other determination manners of the exhaust pressure and / or the exhaust temperature of the compressor having been stabilized can also be selected according to experience by those skilled in the art.

[0117] Further, the time difference between the first time and the second time is negatively related to the actual rotating speed of the wind, so as to reduce the influence of the air outlet of the air conditioner on the indoor temperature, and further reduce the influence of the temperature change of the indoor air on the exhaust pressure and / or the exhaust temperature of the compressor during the process that the opening degree of the throttling valve changes from the first opening degree to the second opening degree.

[0118] S407, the first exhaust pressure difference between the second exhaust pressure and the first exhaust pressure is obtained, and / or, the first exhaust temperature difference between the second exhaust temperature and the first exhaust temperature is obtained.

[0119] S408、In the case that the first exhaust pressure difference value is greater than the set exhaust pressure threshold value, and / or, the first exhaust temperature difference value is greater than the set exhaust temperature threshold value, it is determined that the air conditioner refrigerant is missing.

[0120] The opening difference value of the second opening and the first opening corresponds to the set exhaust pressure threshold value, and the opening difference value of the second opening and the first opening corresponds to the set exhaust temperature threshold value.

[0121] Figure 5 It is a flowchart of an air conditioner refrigerant missing judgment method provided by the embodiment of the application.

[0122] Combined with Figure 5 As shown in the figure, the air conditioner refrigerant missing judgment method comprises:

[0123] S501, determine the set exhaust pressure P, the set exhaust temperature T, the set exhaust pressure difference value X, the set exhaust temperature difference value Y, the set exhaust pressure threshold value X1, and the set exhaust temperature threshold value Y1.

[0124] S502, after the compressor and the fan are stably operated at a fixed frequency, the actual exhaust pressure P1 and the actual exhaust temperature T1 are obtained.

[0125] S503, ΔP=P-P1, ΔT=T-T1.

[0126] S504, judge |ΔP|≤X, and |ΔT|≤Y.

[0127] S505, if the judgment result is "no", continue to judge ΔP≤0, if yes, judge that the system is high pressure protection, and the compressor stops running; otherwise, judge that the system is low pressure protection, and the compressor stops running.

[0128] S506, if the judgment result is "yes", the opening of the throttling valve is the first opening A1, the first exhaust pressure P2 and the first exhaust temperature T2 of the compressor are obtained.

[0129] S507, the opening of the throttling valve is the second opening A2, the second exhaust pressure P3 and the second exhaust temperature T3 of the compressor are obtained.

[0130] S508, ΔP1=|P3-P2|, ΔT1=|T3-T2|.

[0131] S509, judge ΔP1≤X1, and ΔT1≤Y1.

[0132] S510, if the system judgment result is "no", it is determined that the air conditioner refrigerant is missing, and the compressor stops running.

[0133] S511, if the system determination result is yes, it is determined that the system is in normal operation.

[0134] Figure 6 Fig. 1 is a schematic diagram of an air conditioner refrigerant absence determination device provided by an embodiment of the present application. The air conditioner refrigerant absence determination device can be implemented in the form of software, hardware, or a combination of both.

[0135] In combination Figure 6 As shown in the figure, the air conditioner refrigerant absence determination device comprises:

[0136] The first obtaining module 61 is configured to, after the running state of the air conditioner meets the stable running condition, make the opening degree of the throttling valve be a first opening degree at a first time, and obtain a first discharge pressure and / or a first discharge temperature of the compressor.

[0137] The second obtaining module 62 is configured to make the opening degree of the throttling valve be a second opening degree at a second time, and obtain a second discharge pressure and / or a second discharge temperature of the compressor.

[0138] The third obtaining module 63 is configured to obtain a first discharge pressure difference between the second discharge pressure and the first discharge pressure, and obtain a first discharge temperature difference between the second discharge temperature and the first discharge temperature.

[0139] The first determining module 64 is configured to, in the case that the first discharge pressure difference is greater than a set discharge pressure threshold value, and / or the first discharge temperature difference is greater than a set discharge temperature threshold value, determine that the air conditioner refrigerant is absent. The opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge pressure threshold value, and the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge temperature threshold value.

[0140] Optionally, the determination that the running state of the air conditioner meets the stable running condition comprises: obtaining an actual discharge pressure and an actual discharge temperature of the compressor; obtaining a set discharge pressure and a set discharge temperature of the compressor; and in the case that the actual discharge pressure meets the constraint condition of the set discharge pressure, and the actual discharge temperature meets the constraint condition of the set discharge temperature, determining that the running state of the air conditioner meets the stable running condition.

[0141] Optionally, the determination that the actual discharge pressure meets the constraint condition of the set discharge pressure comprises: obtaining a second discharge pressure difference between the set discharge pressure and the actual discharge pressure; and in the case that the second discharge pressure difference is less than or equal to a set discharge pressure difference, determining that the actual discharge pressure meets the constraint condition of the set discharge pressure.

[0142] Optionally, the determining that the actual exhaust temperature satisfies the constraint condition of the set exhaust temperature comprises: obtaining a second exhaust temperature difference between the set exhaust temperature and the actual exhaust temperature; and determining that the actual exhaust temperature satisfies the constraint condition of the set exhaust temperature in a case where the second exhaust temperature difference is less than or equal to a set exhaust temperature difference.

[0143] Optionally, the obtaining of the actual exhaust pressure and the actual exhaust temperature of the compressor comprises: obtaining an actual operating frequency of the compressor and an actual rotating speed of the fan; and obtaining the actual exhaust pressure and the actual exhaust temperature of the air conditioner in a case where the compressor maintains the actual operating frequency unchanged for a duration greater than or equal to a first set duration, and the fan maintains the actual rotating speed unchanged for a duration greater than or equal to a second set duration.

[0144] Optionally, the determining that the operating state of the air conditioner does not satisfy the stable operating condition is in a case where the actual exhaust pressure does not satisfy the constraint condition of the set exhaust pressure, and / or the actual exhaust temperature does not satisfy the constraint condition of the set exhaust temperature.

[0145] Optionally, the air-conditioner refrigerant absence determining apparatus further comprises a second determining module configured to determine that the air-conditioner refrigerant is not absent in a case where the first exhaust pressure difference is less than or equal to a set exhaust pressure threshold, and / or the first exhaust temperature difference is less than or equal to a set exhaust temperature threshold.

[0146] In some embodiments, the air-conditioner refrigerant absence determining apparatus comprises a processor and a memory storing program instructions, the processor is configured to execute the air-conditioner refrigerant absence determining method provided in the foregoing embodiments when executing the program instructions.

[0147] Figure 7 FIG. 1 is a schematic diagram of an air-conditioner refrigerant absence determining apparatus provided by an embodiment of the present application.

[0148] In combination with Figure 7 As shown in FIG. 1, the air-conditioner refrigerant absence determining apparatus comprises:

[0149] The processor 71 and the memory 72 can further comprise a communication interface 73 and a bus 74. The processor 71, the communication interface 73 and the memory 72 can complete mutual communication through the bus 74. The communication interface 73 can be used for information transmission. The processor 71 can invoke the logical instructions in the memory 72 to execute the air-conditioner refrigerant absence determining method provided in the foregoing embodiments.

[0150] In addition, the logical instructions in the memory 72 described above can be implemented in the form of a software function unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0151] The memory 72 can be configured as a computer-readable storage medium, and can be configured to store software programs, computer-executable programs, and the like, such as program instructions / modules corresponding to the method of the embodiments of the present application. The processor 71 can execute the functions of the application and data processing by running the software programs, instructions, and modules stored in the memory 72, that is, implement the method in the method embodiments described above.

[0152] The memory 72 can include a program storage area and a data storage area. The program storage area can store an operating system and at least one application required by a function. The data storage area can store data created according to the use of the terminal device, and the like. In addition, the memory 72 can include a high-speed random access memory, and can also include a non-volatile memory.

[0153] The embodiments of the present application provide an air conditioner, which comprises the air conditioner refrigerant absence judgment device provided in the foregoing embodiments.

[0154] The embodiments of the present application provide a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are configured to execute the air conditioner refrigerant absence judgment method provided in the foregoing embodiments.

[0155] The embodiments of the present application provide a computer program product, which comprises a computer program stored on a computer-readable storage medium. The computer program comprises program instructions. When the program instructions are executed by a computer, the computer executes the air conditioner refrigerant absence judgment method provided in the foregoing embodiments.

[0156] The computer-readable storage medium described above can be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

[0157] The technical solutions of the embodiments of the present application can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method in the embodiments of the present application. The storage medium described above can be a non-transitory storage medium, including a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which are various media that can store program codes. The storage medium can also be a transitory storage medium.

[0158] The above description and drawings are illustrative of embodiments of the application and are not to be construed as limiting the application. Other embodiments can include structural, logical, electrical, process, and other changes. The embodiments are merely examples of the many possible embodiments of the application. Unless explicitly stated otherwise, individual components and functions are optional and the order of operations can vary. Parts and features of some embodiments can be included or replaced in or by parts and features of other embodiments. Also, the word "comprising" and variations thereof, as used in the claims, mean "including but not limited to" and are not intended to exclude other moieties, constituents, steps, or elements. Unless otherwise expressly stated, the use of one or more adjectives or other modifiers in describing an embodiment does not limit the scope of that embodiment to only those items or characteristics being described. Nor does the use of the term "comprising" or "including," or variations thereof, in the claims mean that the scope of the application is not further limited to only the elements or steps described. The word "a" or "an" used in the claims means "one or more" unless otherwise expressly stated. The word "another" used in the claims means "at least a second or one or more" unless otherwise expressly stated. The word "comprise" and variations thereof, as used in the claims, do not exclude the presence of additional elements or steps. Where the disclosure of an embodiment includes "comprising," "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," "or the like," the term "comprising" means "including, but not limited to," and the terms "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," or the like are not used as the only restrictions on the meaning of "comprising." Unless otherwise expressly stated, the use of the term "or" in the claims does not require that alternatives be mutually exclusive. The word "about" used in the claims means "approximately," "around," "nearly," "substantially," or "nearly exactly," unless otherwise expressly stated. The word "substantially" used in the claims means "approximately," "around," "nearly," "about," or "nearly exactly," unless otherwise expressly stated. The word "comprise" and variations thereof, as used in the claims, do not exclude the presence of additional elements or steps. Where the disclosure of an embodiment includes "comprising," "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," "or the like," the term "comprising" means "including, but not limited to," and the terms "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," or the like are not used as the only restrictions on the meaning of "comprising." Unless otherwise expressly stated, the use of the term "or" in the claims does not require that alternatives be mutually exclusive. The word "about" used in the claims means "approximately," "around," "nearly," "substantially," or "nearly exactly," unless otherwise expressly stated. The word "substantially" used in the claims means "approximately," "around," "nearly," "about," or "nearly exactly," unless otherwise expressly stated.

[0159] Those skilled in the art can understand that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of the present application. Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0160] The disclosed method, product (including but not limited to device, equipment, etc.) in the embodiments disclosed in the present document can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units can be merely a logical function division. In actual implementation, another division manner can be used. For example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms. The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the embodiments. In addition, the functional units in the embodiments of the present application can be integrated in one processing unit, or each unit can be a physical unit, or two or more units can be integrated in one unit.

[0161] The flowcharts and block diagrams in the drawings show the possible implementation architecture, function and operation of the system, method and computer program product according to the embodiments of the present application. In this regard, each block in the flowchart or block diagram can represent a module, program segment or part of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks can occur in different orders than those noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes in reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

Claims

1. A method of determining absence of air conditioner refrigerant, characterized by, The method comprises the following steps: After the running state of the air conditioner meets the stable running condition, the opening degree of the throttling valve is the first opening degree at the first time, and the first discharge pressure and / or the first discharge temperature of the compressor are obtained; The opening degree of the throttling valve is the second opening degree at the second time, and the second discharge pressure and / or the second discharge temperature of the compressor are obtained; The first discharge pressure difference between the second discharge pressure and the first discharge pressure is obtained, and / or the first discharge temperature difference between the second discharge temperature and the first discharge temperature is obtained; In the case that the first discharge pressure difference is greater than the set discharge pressure threshold value, and / or the first discharge temperature difference is greater than the set discharge temperature threshold value, it is determined that the refrigerant of the air conditioner is missing; the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge pressure threshold value, and the opening degree difference between the second opening degree and the first opening degree corresponds to the set discharge temperature threshold value.

2. The judging method according to claim 1, characterized by The determination that the running state of the air conditioner meets the stable running condition comprises: The actual discharge pressure and the actual discharge temperature of the compressor are obtained; The set discharge pressure and the set discharge temperature of the compressor are obtained; In the case that the actual discharge pressure meets the constraint condition of the set discharge pressure, and the actual discharge temperature meets the constraint condition of the set discharge temperature, it is determined that the running state of the air conditioner meets the stable running condition.

3. The method of claim 2, wherein The determination that the actual discharge pressure meets the constraint condition of the set discharge pressure comprises: The second discharge pressure difference between the set discharge pressure and the actual discharge pressure is obtained; In the case that the second discharge pressure difference is less than or equal to the set discharge pressure difference, it is determined that the actual discharge pressure meets the constraint condition of the set discharge pressure.

4. The method of claim 2, wherein The determination that the actual discharge temperature meets the constraint condition of the set discharge temperature comprises: The second discharge temperature difference between the set discharge temperature and the actual discharge temperature is obtained; In the case that the second discharge temperature difference is less than or equal to the set discharge temperature difference, it is determined that the actual discharge temperature meets the constraint condition of the set discharge temperature.

5. The method of claim 2, wherein The actual discharge pressure and the actual discharge temperature of the compressor are obtained, comprising: The actual running frequency of the compressor and the actual rotating speed of the fan are obtained; In the case that the compressor maintains the actual running frequency unchanged for a duration greater than or equal to the first set duration, and the fan maintains the actual rotating speed unchanged for a duration greater than or equal to the second set duration, the actual discharge pressure and the actual discharge temperature of the air conditioner are obtained.

6. The method of claim 2, wherein Further comprising: In the case that the actual discharge pressure does not meet the constraint condition of the set discharge pressure, and / or the actual discharge temperature does not meet the constraint condition of the set discharge temperature, it is determined that the running state of the air conditioner does not meet the stable running condition.

7. The method of claim 1, wherein Further comprising: In the case that the first discharge pressure difference is less than or equal to the set discharge pressure threshold value, and / or the first discharge temperature difference is less than or equal to the set discharge temperature threshold value, it is determined that the refrigerant of the air conditioner is not missing.

8. A device for determining air conditioning refrigerant deficiency, characterized in that, The method comprises the following steps: The first obtaining module is configured to, after the running state of the air conditioner meets the stable running condition, make the opening degree of the throttling valve be the first opening degree at the first time, and obtain the first discharge pressure and / or the first discharge temperature of the compressor; The second obtaining module is configured to, make the opening degree of the throttling valve be the second opening degree at the second time, and obtain the second discharge pressure and / or the second discharge temperature of the compressor; a third obtaining module, configured to obtain a first exhaust pressure difference value of a second exhaust pressure and a first exhaust pressure, and a first exhaust temperature difference value of a second exhaust temperature and a first exhaust temperature; a first determining module, configured to determine that the air conditioner refrigerant is missing when the first exhaust pressure difference value is greater than a set exhaust pressure threshold value, and / or the first exhaust temperature difference value is greater than a set exhaust temperature threshold value; the opening difference value of the second opening degree and the first opening degree corresponds to the set exhaust pressure threshold value, and the opening difference value of the second opening degree and the first opening degree corresponds to the set exhaust temperature threshold value.

9. An air-conditioning refrigerant deficiency determination device comprising a processor and a memory having stored therein program instructions, characterized by, The processor is configured to execute the program instructions to perform the method for judging the air conditioner refrigerant missing as claimed in any one of claims 1 to 7.

10. An air conditioner characterized by comprising: The judgment device for the air conditioner refrigerant missing as claimed in claim 8 or 9 is included. The judgment device for the air conditioner refrigerant missing as claimed in claim 8 or 9 is included.

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