Control Method and Device for Compressor Oil Return, Compressor System

Abstract

The present application relates to the technical field of compressor control, and discloses a control method for compressor oil return. The control method includes: detecting the operating frequency of the compressor to obtain the current operating frequency of the compressor; determining a set oil return period according to the current operating frequency of the compressor; obtaining the most recent actual oil return period; when the set oil return period is less than or equal to the most recent actual oil return period, determining the oil return operating period at the current moment according to the set oil return period; when the set oil return period is greater than the most recent actual oil return period, determining the oil return operating period at the current moment according to the most recent actual oil return period; and controlling the operation of the compressor according to the oil return operating period at the current moment. In this way, the accuracy of detecting the oil return operation timing of the compressor can be improved, the occurrence of frequent oil return phenomena can be reduced, and the situation of long-term oil shortage operation can be avoided. The present application also discloses a control device for compressor oil return and a compressor system.

Description

Technical Field

[0001] This application relates to the technical field of compressor control, for example, to a control method and device for compressor oil return, and a compressor system. Background Art

[0002] During the operation of a compressor, sufficient lubricating oil is required to lubricate components. During operation, the lubricating oil is discharged from the compressor together with the refrigerant and returns to the compressor after circulation. The performance of the refrigerant and the lubricating oil are essentially different. The refrigerant exists in a two-phase state during the system circulation process, namely liquid refrigerant and gaseous refrigerant, while the lubricating oil is basically in a liquid state. When the refrigerant changes from liquid to gas, the lubricating oil will precipitate from the refrigerant and may be stored at a certain component or structural point inside the compressor, resulting in the inability of the lubricating oil to flow back to the compressor smoothly, causing an oil shortage situation. If the oil shortage is not solved for a long time, it will lead to insufficient lubrication of the moving parts inside the compressor, resulting in failures such as dry burning, greatly accelerating the damage of the compressor.

[0003] In the related art, by controlling the operating frequency of the compressor to increase the refrigerant flow rate, the effect of bringing the lubricating oil back to the compressor is achieved. When the compressor frequency increases, the refrigerant flow rate passing through the compressor per unit time is larger, and the speed and density of the refrigerant flowing in the pipeline both increase, thus accelerating the speed of lubricating oil return.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] The existing oil return control program requires that after the cumulative duration of continuous low-frequency operation of the compressor meets the set duration (usually more than 5 hours), it enters the oil return operation to adjust the compressor frequency. During this period, due to the too long oil return interval time caused by too low frequency, the compressor will be short of oil and the compressor will be burned out. Moreover, the compressor itself cannot sense the oil shortage and enter the oil return control in advance at any time, thus affecting the normal use of the compressor.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] Embodiments of the present disclosure provide a control method and device for compressor oil return, and a compressor system, to improve the accuracy of detecting the timing of compressor oil return operation.

[0009] In some embodiments, the control method for compressor oil return includes: detecting the operating frequency of the compressor to obtain the current operating frequency of the compressor; determining a set oil return period according to the current operating frequency of the compressor; obtaining the most recent actual oil return period; when the set oil return period is less than or equal to the most recent actual oil return period, determining the oil return operation period at the current moment according to the set oil return period; when the set oil return period is greater than the most recent actual oil return period, determining the oil return operation period at the current moment according to the most recent actual oil return period; and controlling the operation of the compressor according to the oil return operation period at the current moment.

[0010] Optionally, the determining the set oil return period according to the current operating frequency of the compressor includes:

[0011] obtaining the frequency range where the current operating frequency of the compressor is located;

[0012] determining the set oil return period corresponding to the frequency range where the current operating frequency is located according to the correspondence between the frequency range and the set oil return period.

[0013] Optionally, there is a positive correlation between the operating frequency of the compressor and the set oil return period.

[0014] Optionally, the determining the oil return operation period at the current moment according to the most recent actual oil return period includes:

[0015] determining the corresponding compensation duration according to the difference between the set oil return period and the most recent actual oil return period;

[0016] determining the sum of the most recent actual oil return period and the compensation duration as the oil return operation period at the current moment.

[0017] Optionally, the determining the corresponding compensation duration according to the difference between the set oil return period and the most recent actual oil return period includes:

[0018] obtaining the difference range where the difference between the set oil return period and the most recent actual oil return period is located;

[0019] determining the corresponding compensation duration according to the difference range.

[0020] Optionally, there is a positive correlation between the difference between the set oil return period and the most recent actual oil return period and the compensation duration.

[0021] Optionally, the difference range where the difference between the set oil return period and the most recent actual oil return period is located includes:

[0022] Determine a plurality of preset difference ranges according to the current operating frequency of the compressor;

[0023] Determine the difference range where the difference between the set oil return period and the most recent actual oil return period is located among the plurality of preset difference ranges.

[0024] In some embodiments, the control device for compressor oil return includes: a frequency detection module configured to detect the operating frequency of the compressor and obtain the current operating frequency of the compressor; a first acquisition module configured to determine a set oil return period according to the current operating frequency of the compressor; a second acquisition module configured to obtain the most recent actual oil return period; a third acquisition module configured to, when the set oil return period is less than or equal to the most recent actual oil return period, determine the oil return operating period at the current moment according to the set oil return period; and when the set oil return period is greater than the most recent actual oil return period, determine the oil return operating period at the current moment according to the most recent actual oil return period; a control module configured to control the operation of the compressor according to the oil return operating period at the current moment.

[0025] In some embodiments, the control device for compressor oil return includes a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned control method for compressor oil return when running the program instructions.

[0026] In some embodiments, the compressor system includes: a compressor body; the control device for compressor oil return as described above, which is installed on the compressor body.

[0027] The control method, device, and compressor system for compressor oil return provided by the embodiments of the present disclosure can achieve the following technical effects:

[0028] By comparing the length of the set oil return period determined according to the operating frequency of the compressor with the most recent actual oil return period, and then determining the oil return operating period at the current moment, it is possible to determine the oil return operating period that conforms to the current operating state of the compressor, improve the accuracy of detecting the oil return operation timing of the compressor, reduce the occurrence of frequent oil return phenomena, and avoid the situation of long-term oil shortage operation.

[0029] The above general description and the following description are only exemplary and explanatory, and are not used to limit this application. Description of the Drawings

[0030] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and wherein:

[0031] Figure 1 is a schematic diagram of the connecting pipeline of a compressor system in the related art;

[0032] Figure 2 is a schematic diagram of a control method for compressor oil return provided by an embodiment of the present disclosure;

[0033] Figure 3 is a schematic diagram of another control method for compressor oil return provided by an embodiment of the present disclosure;

[0034] Figure 4 is a schematic diagram of a method for determining the compensation duration in an embodiment of the present disclosure;

[0035] Figure 5 is a schematic diagram of another method for determining the compensation duration in an embodiment of the present disclosure;

[0036] Figure 6 is a schematic diagram of another control method for compressor oil return provided by an embodiment of the present disclosure;

[0037] Figure 7 is a schematic diagram of a control device for compressor oil return provided by an embodiment of the present disclosure;

[0038] Figure 8 is a schematic diagram of another control device for compressor oil return provided by an embodiment of the present disclosure;

[0039] Figure 9 is a schematic diagram of a compressor system provided by an embodiment of the present disclosure. Detailed Description of the Embodiment

[0040] In order to more comprehensively understand the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the drawings. The attached drawings are for reference and illustration only, and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0041] In the description, claims, and the above-mentioned drawings of the embodiments of the present disclosure, terms such as "first" and "second" are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

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

[0043] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

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

[0045] The term "corresponding" may refer to an association relationship or a binding relationship. A corresponding to B means that there is an association relationship or a binding relationship between A and B.

[0046] In the embodiments of the present disclosure, an intelligent household appliance device refers to a household appliance product formed by introducing microprocessor, sensor technology, and network communication technology into household appliance devices, and has the characteristics of intelligent control, intelligent perception, and intelligent application. The operation process of intelligent household appliance devices often depends on the application and processing of modern technologies such as the Internet of Things, the Internet, and electronic chips. For example, an intelligent household appliance device can be connected to an electronic device to realize remote control and management of the intelligent household appliance device by the user.

[0047] In the disclosed embodiments, a terminal device refers to an electronic device with a wireless connection function. The terminal device can be connected to the Internet and communicate with the above-mentioned intelligent household appliance device, or can directly communicate with the above-mentioned intelligent household appliance device through Bluetooth, wifi, etc. In some embodiments, the terminal device is, for example, a mobile device, a computer, or an in-vehicle device built in a hover vehicle, etc., or any combination thereof. The mobile device can, for example, include a mobile phone, a smart home device, a wearable device, a smart mobile device, a virtual reality device, etc., or any combination thereof, where the wearable device includes, for example: a smart watch, a smart bracelet, a pedometer, etc.

[0048] Figure 1 It is a schematic diagram of the connecting pipeline of the compressor system in the related art.

[0049] Such as Figure 1As shown, the oil return flow path of the compressor is generally formed by sequentially connecting a compressor 110, an oil separator 120, a capillary tube 130, and a gas-liquid separator 140. The oil outlet end of the oil separator 120 is connected to the inlet end of the capillary tube 130; the refrigerant outlet end of the oil separator 120 is connected to the refrigeration cycle system.

[0050] Here, a capillary tube is used to connect the bottom of the oil separator and the inlet end (low-pressure side) of the gas-liquid separator. Under the pressure difference between high pressure and low pressure, the separated lubricating oil returns to the suction side of the compressor and directly returns to the compressor for local circulation.

[0051] In actual application, the compressor will also discharge a small amount of lubricating oil when discharging the refrigerant. However, even if the oil supply rate is only 0.5%, if the lubricating oil cannot be circulated back to the compressor through the system in time, taking the operating horsepower of the compressor as 5 hp as an example, the circulation amount is about 330 kg / h under ideal conditions. Then, it can take out all the lubricating oil in the compressor within 50 minutes, and the compressor will burn out in about 2 - 5 hours.

[0052] Generally, there are control requirements that the operating frequency of the compressor is lower than 50 Hz and continues to operate at a low frequency for more than 5 hours before entering the oil return operation. During this period, due to the too low frequency and too long oil return interval, the compressor will lack oil and burn out.

[0053] Therefore, this solution proposes a control method for compressor oil return to improve the oil return process by the operating frequency of the compressor and the operation of the oil return program, be able to determine the oil return operation cycle consistent with the current operating state of the compressor, improve the accuracy of detecting the timing of compressor oil return operation, reduce the occurrence of frequent oil return phenomena, and avoid the situation of long-term oil-deficient operation.

[0054] Figure 2 This is a control method for compressor oil return provided by an embodiment of the present disclosure and is applied to a compressor. This method can be executed by a processor connected to the compressor, or by a processor of the refrigeration system where the compressor is located. It can also be executed by a cloud server or a control terminal that communicates with the compressor or the refrigeration system where the compressor is located. In the embodiment of the present disclosure, the processor connected to the compressor is used as the execution subject to illustrate the solution.

[0055] Combined with Figure 2 As shown, the control method for compressor oil return includes:

[0056] Step S201, detect the operating frequency of the compressor to obtain the current operating frequency of the compressor.

[0057] The operating frequency of the compressor can be obtained by detecting the power supply frequency of the compressor or the rotational speed of the compressor.

[0058] Step S202: Determine the set oil return period according to the current operating frequency of the compressor.

[0059] In the embodiments of the present disclosure, the oil return period refers to the interval duration between two oil return operations. That is, in two adjacent oil return operations, it is the duration between the end moment of the previous oil return operation and the start moment of the next oil return operation.

[0060] For different operating frequencies, the lengths of the corresponding set oil return periods are different. For example, when the operating frequency of the compressor is relatively high, the flow rate of the refrigerant passing through the compressor is high, the flow velocity in the pipeline is high, and the flow velocity of the lubricating oil also increases accordingly. At this time, setting a relatively long system oil return time can avoid frequent execution of oil return operation.

[0061] Step S203: Obtain the most recent actual oil return period.

[0062] The most recent actual oil return period refers to the period of the oil return process that is before the current moment and has the closest time interval to the current moment.

[0063] Step S204: When the set oil return period is less than or equal to the most recent actual oil return period, determine the oil return operation period at the current moment according to the set oil return period.

[0064] Step S205: When the set oil return period is greater than the most recent actual oil return period, determine the oil return operation period at the current moment according to the most recent actual oil return period.

[0065] Here, according to the length relationship between the set oil return period and the actual oil return period, the oil return operation period at the current moment is determined. When the set oil return period of the system is less than or equal to the most recent actual oil return period, the oil return operation period at the current moment is mainly determined by the set oil return period of the system. When the oil return period of the system is greater than the most recent actual oil return period, the oil return operation period at the current moment is determined according to the most recent actual oil return period. In this way, by comparing the durations, the occurrence of frequent oil return phenomena can be reduced, and the situation of the system entering long-term oil-deficient operation can be avoided.

[0066] Step S206: Control the operation of the compressor according to the oil return operation period at the current moment.

[0067] According to the oil return operation period at the current moment, take the moment from the end moment of the most recent actual oil return period until the duration reaches the moment after the oil return operation period at the current moment as the new start moment of the compressor oil return operation. It can also be used as the detection moment of the oil return sensor to detect the change of the oil level in the compressor, so as to control the operating frequency of the compressor for corresponding oil return adjustment.

[0068] Thus, by using the control method for compressor oil return provided in the embodiments of the present disclosure, by comparing the set oil return period determined according to the operating frequency of the compressor with the length of the most recent actual oil return period, and then determining the oil return operating period at the current moment, the oil return operating period consistent with the current operating state of the compressor can be determined, improving the accuracy of detecting the timing of compressor oil return, reducing the occurrence of frequent oil return phenomena, and avoiding the situation of long-term oil shortage operation.

[0069] When determining the set oil return period according to the current operating frequency of the compressor, it can be determined through the corresponding relationship between the operating frequency of the compressor and the set oil return period.

[0070] For example, the corresponding relationship between the above-mentioned compressor operating frequency and the set oil return period can be in the form of a one-to-one correspondence data table. In this case, the corresponding relationship between the compressor operating frequency and the set oil return period can be stored in the database in advance. After obtaining the current operating frequency of the compressor, the set oil return period corresponding to the current operating frequency can be obtained by querying the database.

[0071] Figure 3 This is another control method for compressor oil return provided in the embodiments of the present disclosure, which is used to illustrate the method for determining the set oil return period. This method takes the processor connected to the compressor as the execution subject to illustrate the solution.

[0072] Combined with Figure 3 As shown, this control method for compressor oil return includes:

[0073] Step S301, detecting the operating frequency of the compressor to obtain the current operating frequency of the compressor.

[0074] Step S302, obtaining the frequency range where the current operating frequency of the compressor is located.

[0075] Step S303, determining the set oil return period corresponding to the frequency range where the current operating frequency is located according to the corresponding relationship between the frequency range and the set oil return period.

[0076] Here, the set oil return period is determined according to the frequency range where the current operating frequency of the compressor is located. Multiple frequency ranges can be pre-stored in the database, and each frequency range corresponds to a different set oil return period. Thus, after determining the current operating frequency, the corresponding set oil return period can be determined through the frequency range where the current operating frequency is located.

[0077] Optionally, there is a positive correlation between the operating frequency of the compressor and the set oil return period. That is, the higher the operating frequency of the compressor, the longer the corresponding set oil return period. Or, the higher the upper limit value of the frequency range where the operating frequency of the compressor is located, the longer the corresponding set oil return period.

[0078] Table 1 shows the correspondence between the frequency range of the compressor operating frequency and the set oil return period.

[0079] Table 1

[0080] Compressor operating frequency (Hz) Set oil return period (h) P＞80 15 50≤P≤80 10 P＜50 5

[0081] Where P is the current operating frequency of the compressor. In this way, after obtaining the current operating frequency of the compressor, the interval where the current operating frequency of the compressor is located can be determined through Table 1, and then the corresponding set oil return period can be determined.

[0082] Step S304, obtain the most recent actual oil return period.

[0083] Step S305, when the set oil return period is less than or equal to the most recent actual oil return period, determine the oil return operating period at the current moment according to the set oil return period.

[0084] Step S306, when the set oil return period is greater than the most recent actual oil return period, determine the oil return operating period at the current moment according to the most recent actual oil return period.

[0085] Step S307, control the operation of the compressor according to the oil return operating period at the current moment.

[0086] In this way, by using the control method for compressor oil return provided by the embodiments of the present disclosure, by comparing the set oil return period determined according to the frequency range where the operating frequency of the compressor is located with the length of the most recent actual oil return period, and then determining the oil return operating period at the current moment, it is possible to determine the oil return operating period that conforms to the current operating state of the compressor, reduce the occurrence of frequent oil return phenomena, and avoid the situation of long-term oil shortage operation.

[0087] Next, an explanation will be given on how to determine the oil return operating period at the current moment according to the most recent actual oil return period.

[0088] Figure 4 It is a schematic flow diagram of the method for determining the oil return operating period provided by the embodiments of the present disclosure, used to illustrate how to determine the oil return operating period at the current moment when the set oil return period is greater than the most recent actual oil return period.

[0089] Combined with Figure 4 shown, the method includes:

[0090] Step S401, when the set oil return period is greater than the most recent actual oil return period, determine the corresponding compensation duration according to the difference between the set oil return period and the most recent actual oil return period.

[0091] Step S402: Determine the oil return operation cycle at the current moment by adding the most recent actual oil return cycle and the compensation duration.

[0092] Here, by setting the compensation duration determined by the difference between the oil return cycle and the actual oil return cycle, the detection cycle of this oil return is extended, which can avoid frequent oil return operations from affecting the normal operation of the system and improve the accuracy of detecting the timing of the compressor's oil return operation.

[0093] When determining the corresponding compensation duration according to the difference between the set oil return cycle and the most recent actual oil return cycle, it can be determined through the corresponding relationship between this difference and the compensation duration.

[0094] For example, the corresponding relationship between the difference between the above-mentioned set oil return cycle and the most recent actual oil return cycle and the compensation duration can be in the form of a one-to-one data table. In this case, the corresponding relationship between the difference between the set oil return cycle and the actual oil return cycle and the compensation duration can be stored in the database in advance. After obtaining this difference, by querying the database, the compensation duration corresponding to this difference can be obtained.

[0095] Among them, the difference between the set oil return cycle and the most recent actual oil return cycle and the compensation duration have a positive correlation. That is, the greater the difference between the set oil return cycle and the most recent actual oil return cycle, the greater the corresponding compensation duration.

[0096] Optionally, the determination of the compensation duration includes: obtaining the difference range where the difference between the set oil return cycle and the most recent actual oil return cycle is located; determining the corresponding compensation duration according to the difference range.

[0097] Here, the difference range where the difference between the set oil return cycle and the most recent actual oil return cycle is located is used to determine the compensation duration. Multiple difference ranges can be pre-stored in the database, and each difference range corresponds to a different compensation duration. Thus, after determining this difference, the corresponding compensation duration can be determined through the difference range where this difference is located.

[0098] Optionally, the higher the upper limit value of the difference range, the longer the corresponding compensation duration.

[0099] Table 2 shows a corresponding relationship between the difference range of the set oil return cycle and the actual oil return cycle and the compensation duration.

[0100] Table 2

[0101] Difference interval (h) Compensation duration (h) 0≤△t＜3 0.5 3≤△t＜6 1 6≤△t＜10 2

[0102] Among them, △t is the difference between the set oil return cycle and the most recent actual oil return cycle. In this way, after obtaining this difference, the compensation duration corresponding to the difference range where this difference is located can be determined through Table 2, and then the oil return operation cycle at the current moment can be determined.

[0103] In some embodiments, the compensation duration described above can also be determined in combination with the current frequency of the compressor and the difference between the set oil return period and the most recent actual oil return period.

[0104] Figure 5 FIG. 6 is a schematic flowchart of another method for determining the oil return operation period provided by an embodiment of the present disclosure, which is used to illustrate how to determine the oil return operation period at the current moment when the set oil return period is greater than the most recent actual oil return period.

[0105] Combined with Figure 5 As shown, the method includes:

[0106] Step S501: When the set oil return period is greater than the most recent actual oil return period, obtain the difference between the set oil return period and the most recent actual oil return period.

[0107] Step S502: Determine a plurality of preset difference intervals according to the current operating frequency of the compressor.

[0108] Step S503: Determine the difference interval in which the difference between the set oil return period and the most recent actual oil return period is located among the plurality of preset difference intervals.

[0109] Step S504: Determine the corresponding compensation duration according to the difference interval.

[0110] Here, by jointly determining the above compensation duration in combination with the current operating frequency of the compressor and the difference between the set oil return period and the most recent actual oil return period, the oil return operation period can be made more in line with the current working conditions.

[0111] Optionally, determining a plurality of preset difference intervals according to the current operating frequency of the compressor includes: determining a plurality of preset difference intervals corresponding to the frequency interval according to the frequency interval in which the current operating frequency of the compressor is located. Since the set oil return durations corresponding to different compressor operating frequencies are different, the differences between the set oil return period and the actual oil return period are also different. Here, by establishing the correspondence between the frequency interval in which the current operating frequency of the compressor is located and the difference, after obtaining the current operating frequency, the preset difference interval can be determined through the frequency interval in which the current operating frequency is located, and then the interval in which the currently obtained difference is located can be determined.

[0112] Exemplarily, Table 3 shows the correspondence between the frequency interval of the compressor and the preset difference interval.

[0113] Table 3

[0114]

[0115] Wherein, P is the current operating frequency of the compressor, and Δt is the difference between the set oil return period and the most recent actual oil return period. Thus, after obtaining the current operating frequency of the compressor, multiple preset difference intervals corresponding to the interval where the current operating frequency of the compressor is located can be determined through Table 3, and then the corresponding compensation duration can be determined.

[0116] Specifically, the corresponding relationship among the frequency interval where the compressor operating frequency is located, the difference interval where the difference between the set oil return period and the actual oil return period is located, and the compensation duration can be stored in the database in the form of a one-to-one correspondence data table. After obtaining the current operating frequency of the compressor, the difference between the set oil return period and the most recent actual oil return period, the corresponding compensation duration can be obtained by querying the database.

[0117] Exemplarily, Table 4 shows the corresponding relationship among the frequency interval where the compressor operating frequency is located, the difference interval where the difference between the set oil return period and the actual oil return period is located, and the compensation duration.

[0118] Table 4

[0119]

[0120] Wherein, P is the current operating frequency of the compressor, and Δt is the difference between the set oil return period and the most recent actual oil return period. Thus, after obtaining the current operating frequency of the compressor and the difference between the set oil return period and the most recent actual oil return period, the corresponding compensation duration can be determined through Table 4, and then the oil return operating period at the current moment can be determined.

[0121] In this way, by using the control method for compressor oil return provided in the embodiments of the present disclosure, by comparing the length of the set oil return period determined according to the operating frequency of the compressor with the length of the most recent actual oil return period, and then determining the oil return operating period at the current moment, an oil return operating period consistent with the current operating state of the compressor can be determined, the occurrence of frequent oil return phenomena can be reduced, and the situation of long-term oil shortage operation can be avoided.

[0122] Figure 6 It is a control method for compressor oil return provided by the embodiments of the present disclosure and is applied to a compressor. In the embodiments of the present disclosure, the processor connected to the compressor is used as the execution subject to illustrate the solution.

[0123] Combined with Figure 6 As shown, the control method for compressor oil return includes:

[0124] Step S601, detecting the operating frequency of the compressor to obtain the current operating frequency of the compressor.

[0125] Step S602, obtaining the frequency interval where the current operating frequency of the compressor is located.

[0126] Step S603: Determine the set oil return period corresponding to the frequency range in which the current operating frequency is located according to the correspondence between the frequency range and the set oil return period.

[0127] Step S604: Obtain the most recent actual oil return period.

[0128] Step S605: Determine whether the set oil return period is less than or equal to the most recent actual oil return period.

[0129] Step S606: When the set oil return period is less than or equal to the most recent actual oil return period, determine the oil return operation period at the current moment according to the set oil return period.

[0130] Here, when the set oil return period is less than or equal to the most recent actual oil return period, the set oil return period can be set as the oil return operation period at the current moment, that is, when the operation duration of the compressor since the end of the most recent oil return operation reaches the set oil return period, the oil return operation is performed.

[0131] Optionally, after determining the oil return operation period at the current moment according to the set oil return period, it further includes: reducing the most recent actual oil return period as the oil level detection moment of the current period for detecting the oil level of the compressor oil. In this way, the problem of no oil return during long-term operation can be avoided. Here, after reducing the most recent actual oil return period by 0.5 h, it is used as the oil level detection moment of the current period.

[0132] Step S607: When the set oil return period is greater than the most recent actual oil return period, obtain the difference between the set oil return period and the most recent actual oil return period.

[0133] Step S608: Determine the corresponding compensation duration according to the frequency range in which the current operating frequency of the compressor is located and the difference range in which the difference between the set oil return period and the most recent actual oil return period is located.

[0134] Step S609: Determine the sum of the most recent actual oil return period and the compensation duration as the oil return operation period at the current moment.

[0135] Step S610: Control the operation of the compressor according to the oil return operation period at the current moment.

[0136] In this way, by using the control method for compressor oil return provided in the embodiments of the present disclosure, by comparing the length of the set oil return period determined according to the operating frequency of the compressor with the most recent actual oil return period, and then determining the oil return operation period at the current moment, it is possible to determine the oil return operation period that conforms to the current operating state of the compressor, reduce the occurrence of frequent oil return phenomena, and avoid the situation of long-term oil shortage operation.

[0137] Figure 7 It is a schematic diagram of a control device for compressor oil return provided by an embodiment of the present disclosure. The control device for compressor oil return can be implemented in the form of software, hardware, or a combination of both.

[0138] Combined with Figure 7 As shown, an embodiment of the present disclosure provides a control device 700 for compressor oil return, including: a frequency detection module 701, a first acquisition module 702, a second acquisition module 703, a third acquisition module 704, and a control module 705. Among them, the frequency detection module 701 is configured to detect the operating frequency of the compressor and obtain the current operating frequency of the compressor; the first acquisition module 702 is configured to determine a set oil return period according to the current operating frequency of the compressor; the second acquisition module 703 is configured to obtain the most recent actual oil return period; the third acquisition module 704 is configured to determine the oil return operating period at the current moment according to the set oil return period when the set oil return period is less than or equal to the most recent actual oil return period; when the set oil return period is greater than the most recent actual oil return period, determine the oil return operating period at the current moment according to the most recent actual oil return period; the control module 705 is configured to control the operation of the compressor according to the oil return operating period at the current moment.

[0139] Figure 8 It is a schematic diagram of a control device for compressor oil return provided by an embodiment of the present disclosure. Combined with Figure 8 As shown, the control device 800 for compressor oil return includes a processor 801 and a memory 802. Optionally, the device may further include a communication interface 803 and a bus 804. Among them, the processor 801, the communication interface 803, and the memory 802 can communicate with each other through the bus 804. The communication interface 803 can be used for information transmission. The processor 801 can call the logical instructions in the memory 802 to execute the control method for compressor oil return in the above embodiment.

[0140] In addition, when the logical instructions in the above-mentioned memory 802 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0141] The memory 802, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 801 executes functional applications and data processing by running the program instructions / modules stored in the memory 802, that is, implements the control method for compressor oil return in the above embodiments.

[0142] The memory 802 may include a program storage area and a data storage area. The program storage area may store an operating system and application programs required for at least one function. The data storage area may store data created according to the use of the terminal device and the like. In addition, the memory 802 may include a high-speed random access memory and may also include a non-volatile memory.

[0143] Combined Figure 9 As shown, the embodiments of the present disclosure provide a compressor system, including a compressor 110 body and the above control device 700(800) for compressor oil return. The control device 700(800) for compressor oil return is installed on the compressor 110 body. The installation relationship described here is not limited to being placed inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the control device 700(800) for compressor oil return can be adapted to a feasible product body, thereby implementing other feasible embodiments.

[0144] The embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above control method for compressor oil return.

[0145] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0146] The technical solutions of the embodiments of the present disclosure may 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transient storage medium, including: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, or may also be a transient storage medium.

[0147] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or apparatus that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0148] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0149] In the embodiments disclosed in this document, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed coupling, direct coupling, or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of this disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0150] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to the embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the block can occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for oil return of a compressor, characterized in that, Including: Detect the operating frequency of the compressor to obtain the current operating frequency of the compressor; Determine the set oil return period according to the current operating frequency of the compressor; Obtain the most recent actual oil return period; When the set oil return period is less than or equal to the most recent actual oil return period, determine the oil return operating period at the current moment according to the set oil return period; When the set oil return period is greater than the most recent actual oil return period, determine the oil return operating period at the current moment according to the most recent actual oil return period; Control the operation of the compressor according to the oil return operating period at the current moment; Wherein, determining the oil return operating period at the current moment according to the most recent actual oil return period includes: Obtain the difference between the set oil return period and the most recent actual oil return period; Determine multiple preset difference intervals according to the current operating frequency of the compressor; Determine the difference interval where the difference between the set oil return period and the most recent actual oil return period is located among the multiple preset difference intervals; Determine the corresponding compensation duration according to the difference interval; Determine the sum of the most recent actual oil return period and the compensation duration as the oil return operating period at the current moment.

2. The control method according to claim 1, characterized in that, The determining the set oil return period according to the current operating frequency of the compressor includes: Obtain the frequency interval where the current operating frequency of the compressor is located; Determine the set oil return period corresponding to the frequency interval where the current operating frequency is located according to the corresponding relationship between the frequency interval and the set oil return period.

3. The control method according to claim 1, characterized in that, There is a positive correlation between the operating frequency of the compressor and the set oil return period.

4. The control method according to claim 1, characterized in that, There is a positive correlation between the difference between the set oil return period and the most recent actual oil return period and the compensation duration.

5. A control device for oil return of a compressor, characterized in that, Including: A frequency detection module configured to detect the operating frequency of the compressor to obtain the current operating frequency of the compressor; A first acquisition module configured to determine the set oil return period according to the current operating frequency of the compressor; A second acquisition module configured to obtain the most recent actual oil return period; A third acquisition module configured to, when the set oil return period is less than or equal to the most recent actual oil return period, determine the oil return operating period at the current moment according to the set oil return period; when the set oil return period is greater than the most recent actual oil return period, determine the oil return operating period at the current moment according to the most recent actual oil return period; A control module configured to control the operation of the compressor according to the oil return operating period at the current moment; Wherein, determining the oil return operating period at the current moment according to the most recent actual oil return period includes: Obtain the difference between the set oil return period and the most recent actual oil return period; Determine multiple preset difference intervals according to the current operating frequency of the compressor; Determine the difference interval where the difference between the set oil return period and the most recent actual oil return period is located among the multiple preset difference intervals; Determine the corresponding compensation duration according to the difference interval; Determine the sum of the most recent actual oil return period and the compensation duration as the oil return operating period at the current moment.

6. A control device for oil return of a compressor, including a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the control method for compressor oil return according to any one of claims 1 to 4 when running the program instructions.

7. A compressor system, characterized in that, Comprising: Compressor body; A control device for compressor oil return as claimed in claim 5 or 6, which is installed on the compressor body.

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