CN113739345A

CN113739345A - Oil return control method, device, equipment and storage medium

Info

Publication number: CN113739345A
Application number: CN202111126656.4A
Authority: CN
Inventors: 陈传虎
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2021-12-03

Abstract

The invention discloses an oil return control method, device, equipment and storage medium, and belongs to the technical field of air conditioners. According to the method, by determining the compressors in the oil shortage state in the air conditioner system, when the number of the compressors in the oil shortage state is smaller than the total number of the compressors in the air conditioner system, the compressors in the oil shortage state are increased to the target frequency from the first operation frequency, so that the compressors in the oil shortage state return oil, and the current second operation frequency of the compressors in the air conditioner system which are not in the oil shortage state is obtained; and determining the current load of the air conditioner system according to the second operating frequency and the target frequency, controlling the operation of the compressor which is not in the oil shortage state according to the current load, and controlling the operation of the compressor which is not in the oil shortage state according to the current load of the air conditioner system while performing oil return on the compressor which is in the oil shortage state, so that the load of the air conditioner system is prevented from fluctuating when the compressor returns oil, and the comfort of a user is improved.

Description

Oil return control method, device, equipment and storage medium

Technical Field

The invention relates to the technical field of air conditioner control, in particular to an oil return control method, device, equipment and storage medium.

Background

The compressor is a core module of the air conditioning system, the compressor needs lubricating oil for lubrication in the operation process, otherwise the compressor is damaged due to overheating or abrasion, and in order to ensure safe and reliable operation of the air conditioning system, the compressor must maintain a safe oil level so that the oil amount of the compressor is higher than the minimum oil amount needed by the compressor, thereby ensuring safe and reliable operation of the compressor. The traditional module machine is provided with a plurality of outdoor units which are independent from each other, and the oil return mode is to switch the currently running compressor to the oil return frequency for oil return at the same time, so that the system load fluctuates greatly in a short time, and the comfort of indoor users is reduced.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide an oil return control method, an oil return control device, oil return control equipment and a storage medium, and aims to solve the technical problems that in the prior art, the compressor causes large load fluctuation of an air conditioner system during oil return, and the comfort of indoor users is reduced.

In order to achieve the purpose, the invention provides an oil return control method, which comprises the following steps:

determining a compressor in an oil starvation state in an air conditioner system;

when the number of the compressors in the oil shortage state is smaller than the total number of the compressors in the air conditioner system, acquiring a current first operating frequency of the compressors in the oil shortage state;

raising the compressor in the oil shortage state from the first operation frequency to a target frequency so as to return oil to the compressor in the oil shortage state;

acquiring a current second operating frequency of a compressor which is not in an oil shortage state in the air conditioner system;

determining the current load of the air conditioner system according to the second running frequency and the target frequency; and

and controlling the compressor which is not in the oil shortage state to operate according to the current load.

Optionally, before raising the compressor in the oil-deficient state from the first operating frequency to a target frequency to return oil to the compressor in the oil-deficient state, the method further includes:

when the first operating frequency is smaller than a preset oil return frequency, taking the preset oil return frequency as a target frequency; and

and when the first operating frequency is greater than or equal to the preset oil return frequency, taking a preset compressor frequency threshold value as a target frequency.

Optionally, the controlling the operation of the compressor not in the oil shortage state according to the current load includes:

acquiring a load difference between the current load and a preset demand load; and

and when the load difference does not meet the preset condition, controlling the compressor which is not in the oil shortage state to operate according to the load difference and a preset strategy.

Optionally, before the controlling the compressor not in the oil shortage state according to the load difference and a preset strategy, the method further includes:

acquiring the working state of a compressor in the air conditioner system;

detecting whether a compressor in a shutdown state exists in the air conditioner system according to the working state;

when the compressor in the shutdown state does not exist, taking the first control strategy as a preset strategy;

when the compressor in the shutdown state exists, acquiring the startup number of the compressors in the startup state; and

and when the number of the compressors in the oil shortage state is less than the starting number, taking a second control strategy as a preset strategy.

Optionally, the controlling the operation of the compressor not in the oil shortage state according to the load difference and a preset strategy includes:

when the preset strategy is the first control strategy, reducing the second operation frequency according to the load difference so as to reduce the load difference; and

and controlling the compressor which is not in the oil shortage state to operate according to the reduced second operation frequency.

when the preset strategy is the second control strategy, recording the starting time corresponding to the compressor which is not in the oil shortage state and the shutdown time corresponding to the compressor which is in the shutdown state; and

and when the starting time is more than or equal to a first preset time and the shutdown time is more than or equal to a second preset time, closing the compressor which is not in the oil shortage state, and starting the compressor which is in the shutdown state.

Optionally, before the turning off the compressor not in the oil shortage state, the method further includes:

recording the time length of non-oil return corresponding to the compressor which is not in the oil shortage state;

when the non-oil-return time length is longer than a preset third time length, controlling the compressor which is not in the oil shortage state to return oil; and

and after the compressor which is not in the oil shortage state finishes oil return, executing the steps of closing the compressor which is not in the oil shortage state and starting the compressor which is in the shutdown state.

Optionally, after the controlling the operation of the compressor not in the oil shortage state according to the current load, the method further includes:

recording the oil return time corresponding to the compressor in the oil shortage state;

detecting a compressor still in an oil shortage state in the air conditioner system when the oil return time reaches a preset time; and

and closing the compressor still in the oil shortage state, and increasing the running frequency of the compressor not in the oil shortage state in the air conditioner system so as to enable the current load of the air conditioner system to meet the preset condition.

In addition, in order to achieve the above object, the present invention further provides an oil return control device, including:

the detection module is used for determining a compressor in an oil shortage state in the air conditioner system;

the acquiring module is used for acquiring the current first operating frequency of the compressor in the oil shortage state when the number of the compressors in the oil shortage state is smaller than the total number of the compressors in the air conditioner system;

the control module is used for increasing the compressor in the oil shortage state from the first operation frequency to a target frequency so as to enable the compressor in the oil shortage state to return oil;

the acquisition module is also used for acquiring the current second operating frequency of the compressor which is not in the oil shortage state in the air conditioner system;

the calculation module is used for determining the current load of the air conditioner system according to the second running frequency and the target frequency;

and the control module is also used for controlling the compressor which is not in the oil shortage state to operate according to the current load.

In addition, in order to achieve the above object, the present invention also provides an oil return control apparatus, including: a memory, a processor and an oil return control program stored on the memory and executable on the processor, the oil return control program being configured to implement the steps of the oil return control method as described above.

In addition, in order to achieve the above object, the present invention further provides a storage medium, wherein the storage medium stores an oil return control program, and the oil return control program implements the steps of the oil return control method as described above when being executed by a processor.

According to the method, by determining the compressors in the oil shortage state in the air conditioner system, when the number of the compressors in the oil shortage state is smaller than the total number of the compressors in the air conditioner system, the compressors in the oil shortage state are increased to the target frequency from the first operation frequency, so that the compressors in the oil shortage state return oil, and the current second operation frequency of the compressors in the air conditioner system which are not in the oil shortage state is obtained; and determining the current load of the air conditioner system according to the second operating frequency and the target frequency, controlling the operation of the compressor which is not in the oil shortage state according to the current load, and controlling the operation of the compressor which is not in the oil shortage state according to the current load of the air conditioner system while performing oil return on the compressor which is in the oil shortage state, so that the load of the air conditioner system is prevented from fluctuating when the compressor returns oil, and the comfort of a user is improved.

Drawings

Fig. 1 is a schematic structural diagram of an oil return control device of a hardware operating environment according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a first embodiment of an oil return control method according to the present invention;

fig. 3 is a schematic structural diagram of an air conditioner system according to an embodiment of the oil return control method of the present invention;

fig. 4 is a schematic flow chart of a second embodiment of the oil return control method of the present invention;

fig. 5 is a schematic flow chart of a third embodiment of an oil return control method according to the present invention;

fig. 6 is a block diagram of the oil return control device according to the first embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an oil return control device in a hardware operating environment according to an embodiment of the present invention.

As shown in fig. 1, the oil return control apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.

Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the oil return control device and may include more or less components than those shown, or some components may be combined, or a different arrangement of components.

As shown in fig. 1, the memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and an oil return control program.

In the oil return control apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the electronic device according to the present invention may be provided in an oil return control device, and the oil return control device calls the oil return control program stored in the memory 1005 through the processor 1001 and executes the oil return control method according to the embodiment of the present invention.

An embodiment of the present invention provides an oil return control method, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the oil return control method according to the present invention.

In this embodiment, the oil return control method includes the following steps:

step S10: a compressor in an oil starvation condition in an air conditioner system is determined.

In this embodiment, the execution main body of this embodiment may be an oil return control device, the oil return control device may be an electronic device such as a personal computer or a server, or may be another controller that can achieve the same or similar functions.

It should be noted that the air conditioner system described in this embodiment includes a plurality of sets of outdoor units, and heat or cooling energy is provided to indoor areas by the plurality of sets of outdoor units, as shown in fig. 3, the air conditioner system shown in fig. 3 includes eight sets of outdoor units, ID1, ID2, ID. The air conditioner compressor extracts the refrigerant from a low-pressure area, compresses the refrigerant and sends the compressed refrigerant to a high-pressure area for cooling and condensation, heat is emitted into air through the radiating fins, the refrigerant is changed from a gas state into a liquid state, and the pressure is increased. The working circuit of the air-conditioning compressor is divided into an evaporation zone (low-pressure zone) and a condensation zone (high-pressure zone). The indoor unit and the outdoor unit of the air conditioner belong to a low pressure region or a high pressure region, respectively (depending on the operating state). The refrigerant flows from the high-pressure area to the low-pressure area and is sprayed into the evaporator through the capillary tube, the pressure is suddenly reduced, the liquid refrigerant immediately becomes gaseous, and a large amount of heat in the air is absorbed through the radiating fins. Therefore, the air conditioner compressor continuously works, heat at one end of the low-pressure area is continuously absorbed into the refrigerant and then is sent to the high-pressure area to be emitted into the air, the air conditioner compressor plays a role in adjusting the air temperature, the compressor is the core of the whole air conditioner system, and the quality of the compressor directly determines the refrigerating or heating effect of the whole air conditioner system. The compressor needs to be lubricated by lubricating oil in the operation process, and after the conventional air conditioner operates for a period of time, the safe oil level of the compressor is usually lower than the minimum oil level required by the compressor, for example, the type of a quick connection pipe type air conditioner is adopted, after a quick connector is screwed down, a circulation channel is a sealing ring, the channel area is much smaller than that of a common connecting pipe, when the air conditioner operates, gaseous refrigerants can pass through the quick connector more easily, liquid oil passes through the quick connector difficultly, the quick connector has a certain blocking effect on the oil, so that the oil is retained in an evaporator or an air pipe connecting pipe and cannot return to the compressor in time, when the operation time is long, the compressor is easy to be in a state of less oil or even lack of oil, and the compressor is damaged due to overheating or abrasion, so that the stability of the whole air conditioner system is influenced.

It should be noted that, in order to avoid the damage of the compressor caused by the lack of the lubricating oil, the prior art adopts a mode of switching the operating frequency of the compressor in the low oil or low oil state during operation to the oil return frequency at regular time, and when the compressor operates according to the oil return frequency, the oil in the evaporator and the air pipe connecting pipe can be pumped back to the compressor through the self-suction characteristic, so as to ensure that the lubricating oil in the compressor is at the safe oil level, but it is easy to understand that when the operating frequency of the compressor changes, the load of the whole air conditioner system can be changed, therefore, the prior art adopts a mode of realizing oil return of the compressor, but the load of the air conditioner system can generate great fluctuation when the compressor in the low oil or low oil state returns oil, the operation of the compressor in the non-starved state is also correspondingly controlled, thereby ensuring that the load of the air conditioner system does not generate large fluctuation.

In a specific implementation, before performing oil return control on the compressor in this embodiment, it is required to determine whether a compressor that needs oil return exists in the air conditioner system, that is, a compressor that is in an oil-deficient state. Further, in this embodiment, the user may input an oil return instruction to the air conditioner system to detect whether the compressor in the oil shortage state exists in the air conditioner system, and may further set a preset time, and when the preset time is reached, automatically detect whether the compressor in the oil shortage state exists in the air conditioner system, where the preset time and the detection mode in this embodiment may be set correspondingly according to an actual situation, and this is not limited in this embodiment.

Step S20: and acquiring a current first operating frequency of the compressor in the oil shortage state.

In the present embodiment, since the compressor that does not need to be oil-returned, that is, the compressor that is not in the oil-deficient state is also controlled while oil is returned to the compressor that is in the oil-deficient state, it is necessary to ensure that at least one or more compressors that are not in the oil-deficient state exist in the entire air conditioner system. In this embodiment, the total number of the compressors in the air conditioner system and the number of the compressors in the oil shortage state are obtained, the total number is compared with the number of the compressors in the oil shortage state, if the number of the compressors in the oil shortage state is smaller than the total number of the compressors, it is indicated that the compressors not in the oil shortage state exist in the air conditioner system, and in this case, the current operating frequency, that is, the first operating frequency of the compressors in the oil shortage state is obtained. Further, if the compressors in the oil starvation state are equal to the total number of compressors, oil return control is not performed on the compressors in the air conditioner system.

Step S30: and raising the compressor in the oil shortage state from the first operation frequency to a target frequency so as to return oil to the compressor in the oil shortage state.

In specific implementation, in this embodiment, the oil return control of the compressor in the oil-deficient state is realized by increasing the current operating frequency of the compressor in the oil-deficient state, specifically, in this embodiment, the current operating frequency of the compressor in the oil-deficient state is increased to the target frequency, that is, the first operating frequency is increased to the target frequency. In this embodiment, the target frequency may be set according to the actual oil return requirement, which is not limited in this embodiment.

Further, in order to make the target frequency more reasonable and improve the oil return effect in this embodiment, the following method may be implemented.

In a specific implementation, in this embodiment, the first operating frequency is compared with a preset oil return frequency, so as to determine the target frequency. Specifically, if the first operating frequency is less than the preset oil return frequency, it indicates that the operating frequency of the compressor is low at this time, oil return cannot be performed, in this case, the first operating frequency needs to be increased to the preset oil return frequency, and the target frequency at this time is the preset oil return frequency, where the preset oil return frequency may be set correspondingly according to an actual oil return requirement, which is not limited in this embodiment. Further, if the first operating frequency is greater than or equal to the preset oil return frequency, although the operating frequency of the compressor at this time exceeds the preset oil return frequency, oil return may be performed, but the compressor still belongs to the compressor in the oil shortage state, in this case, the frequency of the compressor is increased to the maximum frequency of the compressor, that is, the preset compressor frequency threshold, where the target frequency is the preset compressor frequency threshold, where the preset compressor frequency threshold may be correspondingly adjusted according to the performance parameter of the compressor, and this is not limited in this embodiment.

Step S40: and acquiring the current second operating frequency of the compressor which is not in the oil shortage state in the air conditioner system.

It should be noted that, in this embodiment, while the oil is returned from the compressor, the operation of the compressor not in the oil-starved state is controlled to ensure the stable state of the air conditioner system, in this embodiment, the operation of the compressor not in the oil-starved state is also controlled based on the current operation frequency of the compressor not in the oil-starved state, and the current operation frequency of the compressor not in the oil-starved state is the second operation frequency.

Step S50: and determining the current load of the air conditioner system according to the second running frequency and the target frequency.

It should be noted that the frequency of the compressor determines the load of the entire air conditioner system, and the current load corresponding to the air conditioner system may be determined according to the second operating frequency corresponding to the compressor not in the oil shortage state and the target frequency corresponding to the compressor in the oil shortage state.

Step S60: and controlling the compressor which is not in the oil shortage state to operate according to the current load.

In specific implementation, after the current load is determined, the operation of the compressor which is not in the oil shortage state is controlled according to the current load, so that the load of the whole air conditioner system can be ensured not to generate large fluctuation. In addition, it should be emphasized that, since the operating frequency of the compressor in the oil shortage state is increased in this embodiment, the current load corresponding to the air conditioner system determined according to the target frequency may be greater than the load of the air conditioner system before the oil return control, and in this embodiment, in order to ensure the load balance, the operating frequency of the compressor not in the oil shortage state may be decreased according to the current load.

In the embodiment, by determining the compressors in the oil shortage state in the air conditioner system, when the number of the compressors in the oil shortage state is smaller than the total number of the compressors in the air conditioner system, the compressors in the oil shortage state are increased from the first operating frequency to the target frequency, so that the compressors in the oil shortage state return oil, and the current second operating frequency of the compressors in the air conditioner system which are not in the oil shortage state is obtained; and determining the current load of the air conditioner system according to the second operating frequency and the target frequency, controlling the operation of the compressor which is not in the oil shortage state according to the current load, and controlling the operation of the compressor which is not in the oil shortage state according to the current load of the air conditioner system while performing oil return on the compressor which is in the oil shortage state, so that the load of the air conditioner system is prevented from fluctuating when the compressor returns oil, and the comfort of a user is improved.

Referring to fig. 4, fig. 4 is a schematic flow chart of an oil return control method according to a second embodiment of the present invention.

Based on the first embodiment, step S50 in the oil return control method of this embodiment specifically includes:

step S501: and acquiring the load difference between the current load and a preset demand load.

It should be noted that, in this embodiment, after obtaining the current load of the entire air conditioner system when the compressor returns oil, a difference between the current load and a preset required load is calculated to obtain a load difference, where the preset required load is a load required by an indoor user, and may be set correspondingly according to an actual cooling or heating requirement of the user, which is not limited in this embodiment.

Step S502: and controlling the compressor which is not in the oil shortage state to operate according to the load difference and a preset strategy.

In a specific implementation, after determining the load difference, it is required to detect whether the load difference meets a preset condition, for example, Abs (Q-Qcal) < 5% × Q, where Q is a preset required load, Qcal is a current load, and 5% × Q is the preset condition, and the preset condition may be adjusted accordingly according to an actual requirement, which is not limited in this embodiment.

In specific implementation, in this embodiment, when the operation of the compressor that is not in the oil shortage state is controlled according to the load difference, a preset strategy is combined, where the preset strategy includes a plurality of different control strategies, and specific settings of the preset strategy may be adjusted accordingly according to actual control requirements, which is not limited in this embodiment.

Further, in this embodiment, in order to preset a more reasonable strategy and to improve the load stability of the air conditioner system during oil return of the compressor, the following method may be implemented.

In the specific implementation, the working states of the compressors in the air conditioner system are detected first, because in the actual process, not all the compressors are in the on state, and the compressors in the on state and the compressors in the off state in the air conditioner system can be determined through the detection of the working states. If there is no compressor in the shutdown state in the air conditioner system, in this case, it may be determined that the air conditioner system is in the full-load state of the compressor. Further, if there are compressors in the shutdown state in the air conditioner system, the air conditioner system is in a partial load state of the compressors, the number of the compressors in the startup state needs to be detected, then the number of the compressors in the oil shortage state is compared with the startup number, and if the number of the compressors in the oil shortage state is smaller than the startup number, the preset strategy is the second control strategy. Further, if the number of the compressors in the oil shortage state is equal to the starting number, the preset strategy is the first control strategy.

Further, if the first control strategy is taken as the preset strategy, in this embodiment, the second operating frequency is reduced according to the load difference, the load difference is also reduced during the reduction of the second operating frequency, and the criterion for reducing the second operating frequency is based on the load difference. For example, before the frequency reduction is performed, the load difference is not greater than the preset condition, that is, Abs (Q-Qcal) > 5% × Q, and during the frequency reduction, if Abs (Q-Qcal) < 5% × Q is detected, the reduction of the second operating frequency is stopped, and the operation of the compressor which is not in the oil shortage state is controlled according to the reduced second operating frequency. It should be noted that, when the compressor not in the oil-starved state is in the low-load operation, there may be a condition that Abs (Q-Qcal) < 5% × Q cannot be satisfied regardless of how the second operating frequency is lowered, in this case, the lowered second operating frequency is compared with the minimum frequency of the compressor not in the oil-starved state in this embodiment, and if the second operating frequency has been lowered to the minimum frequency or less, the compressor not in the oil-starved state is turned off when the current load still does not satisfy the condition that Abs (Q-Qcal) < 5% × Q, wherein the minimum frequency may be set according to the actual performance parameters of the compressor. In this embodiment, a first control strategy is illustrated in a form of a table, where the compressors in each module in the air conditioner system are set to be the same, the maximum frequency of the compressor operation is 120Hz, the minimum frequency is 15Hz, and the oil return frequency of the compressor is 85Hz (the oil return frequency varies with load during partial load, and is not considered here), it is assumed that the compressor satisfies the shutdown condition of 120 minutes of operation time, the compressor satisfies the startup condition of 30 minutes of shutdown, and the cycle operation time interval of the partial load module is 180 minutes, where the table is as follows:

table 1:

mode 1

Compressor 1

Compressor 2

Compressor 3

Compressor 4

Compressor 5

Compressor 6

Boot-up state

ON

Frequency of

60

Whether lack of oil

Is that

Whether or not

All the compressors in the table 1 are started and run at 60Hz, wherein the compressors 1 and 2 are lack of oil, the monitoring module finds that the compressors 1 and 2 are lack of oil, the compressor frequency of the compressors 1 and 2 is gradually increased to the oil return frequency of 85Hz, the compressor frequency of the compressors 3 and 4 is reduced under the condition that the indoor load is not changed, and the specified oil return time is run for oil return.

Table 2:

mode 2

Compressor 1

Compressor 2

Compressor 3

Compressor 4

Compressor 5

Compressor 6

Boot-up state

ON

Frequency Hz

90

Whether lack of oil

Is that

Whether or not

Further, in this embodiment, the oil return time length for returning oil to the compressor in the oil shortage state is recorded, and the oil return time length is compared with the preset time length, if the oil return time length has reached the preset time length, the oil shortage state of the compressor is detected again, if the compressor in the oil shortage state still exists in the air conditioner system after the oil return for the preset time length, the compressors still in the oil shortage state are turned off, and the frequencies of other compressors not in the oil shortage state are increased to ensure that the current load of the air conditioner system meets the preset condition, the preset condition in this embodiment may be set as the preset indoor demand load, the preset time length for returning oil and the preset indoor demand load may be set correspondingly according to the actual situation, this is not limited in this embodiment, all the compressors in table 2 are turned on and operate at 90Hz, wherein the compressors in the compressor 1 are always starved of oil. The monitoring module detects and discovers that the compressor 1 is lack of oil, the compressor frequency of the compressor 2 can be reduced when the compressor frequency of the compressor 1 reaches the maximum frequency to guarantee indoor load, specified oil return time is operated, if the monitoring module always discovers that the compressor is lack of oil, the compressor needs to be immediately closed, warning information is sent out, and meanwhile the frequency of the compressors 2, 3 and 4 is gradually increased until the indoor load condition is met.

Table 3:

mode 3

Compressor 1

Compressor 2

Compressor 3

Compressor 4

Compressor 5

Compressor 6

Boot-up state

ON

OFF

ON

Frequency Hz

60

20

60

Whether lack of oil

Is that

Whether or not

In table 3, the compressor 1 is out of oil, the monitoring module detects that the compressor 1 is out of oil, at this time, the frequency of the compressor in the compressor 1 can be increased to the oil return frequency, and the frequency of the compressor 5 can be reduced at the same time, the compressor 5 can be reduced to be lower than the minimum frequency, at this time, the compressor 5 can be turned off, then the frequency of the compressor 6 is continuously reduced, and the specified oil return time is executed when the load determination condition is met.

The embodiment obtains the load difference between the current load and the preset demand load; when the load difference does not meet the preset condition, the operation of the compressor which is not in the oil shortage state is controlled according to the load difference and the preset strategy, meanwhile, the preset strategy is determined according to the working state of the compressor in the air conditioner system, and the stability of the load of the whole air conditioner system can be guaranteed while the compressor returns oil.

Referring to fig. 5, fig. 5 is a schematic flow chart of an oil return control method according to a third embodiment of the present invention.

Based on the second embodiment, a third embodiment of the oil return control method according to the present invention is provided, in this embodiment, the step S502 specifically includes:

step S5021: and recording the starting time corresponding to the compressor which is not in the oil shortage state and the shutdown time corresponding to the compressor which is in the shutdown state.

It should be noted that, if the second control strategy is taken as a preset strategy, in this case, a compressor in a shutdown state and a compressor in a startup state exist in the air conditioner system, the compressor in the startup state includes a compressor in an oil shortage state and a compressor not in the oil shortage state, at this time, the startup duration of the compressor not in the oil shortage state in the compressor in the startup state and the shutdown duration of the compressor in the shutdown state need to be recorded, whether the compressor not in the oil shortage state is started for a long time is determined by the startup duration, and whether the compressor in the shutdown state is shut down for a long time is determined by the shutdown duration.

Step S5022: and closing the compressor which is not in the oil shortage state, and starting the compressor which is in the shutdown state.

In specific implementation, the starting time is compared with a first preset time, meanwhile, the shutdown time is compared with a second preset time, if the starting time is greater than or equal to the first preset time, and meanwhile, the shutdown time is greater than or equal to the second preset time, it is indicated that a compressor which is not in an oil shortage state is started for a long time, and the compressor which is in the shutdown state is also shut down for a long time, at the moment, the compressor which is not in the oil shortage state is closed, and the compressor which is in the shutdown state is simultaneously opened, so that the circulation opening and the periodic oil return of all the compressors can be realized, the possibility of oil shortage of a system is reduced, and the risk of lubricating oil condensation of the compressor during long-term shutdown is reduced because the compressors can both run periodically. Further, before closing a compressor which is started for a long time and is not in an oil shortage state, it is necessary to obtain an oil non-return time of the compressor, in this embodiment, it is determined whether the compressor has not performed oil return for a long time through a third preset time, specifically, if the oil non-return time is greater than the preset third time, it is determined that the compressor has not performed oil return for a long time, before closing, in order to reduce the possibility of oil shortage, the compressor is returned oil first, and after the oil return operation is completed, the compressor is closed.

Further, in the present embodiment, the second control strategy is illustrated in a table form, for example, the table is as follows:

table 4:

mode 4

Compressor 1

Compressor 2

Compressor 3

Compressor 4

Compressor 5

Compressor 6

Boot-up state

ON

OFF

Frequency Hz

60

－

Whether lack of oil

Is that

Whether or not

Duration of power-on

100

150

－

Duration of shutdown

－

20

60

In table 4, the compressors 1 to 4 operate at 60Hz, and the compressors 5 to 6 are in a shutdown state, where the compressor 1 is out of oil, the monitoring module detects that the compressor 1 is out of oil and the shutdown time of the compressor 6 is 60 minutes, which satisfies the startup condition, and the startup time of the compressor 4 is 150 minutes, which satisfies the shutdown condition. At this time, the compressor 4 can be turned off and the compressor 5 can be turned on, the frequency of the compressor 5 is increased to 60Hz, the frequency of the compressor 1 is increased to the oil return frequency, and the frequency of the compressor 2 is reduced until the load judgment is met, and then the operation is carried out for the specified oil return time.

The oil return time period (e.g., 180 minutes) is specified in table 5 and the compressor is cycled on to ensure that all compressors are operating periodically to extend the life of the compressor because the air conditioning compressor will cause the compressor oil to condense if it is not turned on for a long period of time. The compressors in module 1 and module 2 run 180 respectively to meet oil return conditions, and other compressors are in a shutdown state, and other parameters are shown in table 5.

Table 5:

table 6:

the current running state running time length: compressors 1 and 2 were run for 180 minutes as shown in table 5, and after running for a specified oil return time, compressors 1 and 2 were turned off while the compressors 3 and 4 having the longest downtime were turned on and run for one hour as shown in table 6.

In table 6, the current operating state operating duration: the compressors 1 and 2 are operated for 180 minutes as shown in table 5, the compressors 1 and 2 are turned off while the compressors 3 and 4 having the longest downtime are turned on and operated for one hour after the operation for the designated oil return time as shown in table 6, the compressor 4 is operated for 180 minutes in an accumulated manner after 1 hour as shown in table 7, the oil return condition is satisfied, and the compressor 4 is turned off while the compressor 5 or 6 having the longest downtime is turned on and operated for 1 hour after the operation for the designated oil return time as shown in table 7.

After 2 hours, the compressor 3 is operated for 180 minutes in an accumulated manner, the oil return condition is satisfied, and after the specified oil return time is executed, the compressor 3 is turned off and the compressor 6 is turned on at the same time, as shown in table 7.

Table 7:

in table 8, after 3.5 hours have elapsed, the cumulative operation of the compressor 5 reaches 180 minutes, the oil return condition is satisfied, and after the specified oil return time is performed, the compressor 7 is turned on while the compressor 5 is turned off, as shown in table 8.

Table 8:

in table 9, after 4 hours have passed, the compressor 7 is operated for 180 minutes in total, the oil return condition is satisfied, and after the specified oil return time is performed, the compressor 7 is turned off while the compressor 8 is turned on, as shown in table 9.

Table 9:

in table 10, after 4.5 hours, it is monitored that the compressor 6 has been operated for 180 minutes in an accumulated manner, and the compressor 6 has satisfied the oil return condition, and after the specified oil return time is performed, the compressor 6 is turned off and the compressor 1 or 2 is turned on, thus forming a cycle, as shown in table 10.

Table 10:

in this embodiment, when the preset strategy is the second control strategy, recording a startup duration corresponding to the compressor not in the oil shortage state and a shutdown duration corresponding to the compressor in the shutdown state; the utility model discloses a compressor, including compressor, oil starvation state, the first time of predetermineeing of the first time of more than or equal to during the start-up just long when the second is predetermine during the shutdown, closes the compressor that is not in the oil starvation state, and starts the compressor that is in the shutdown state through closing the compressor that has not been in the oil starvation state of start longer time and opening the compressor that has been in the shutdown state for a longer time, can realize that all compressors circulation is opened and periodic oil return, reduces the possibility of system oil starvation, simultaneously because the compressor can both run regularly, reduces the risk that the long-term shutdown lubricating oil of compressor condenses, when guaranteeing air conditioner system stability, has also improved the life of compressor.

In addition, an embodiment of the present invention further provides a storage medium, where the storage medium stores an oil return control program, and the oil return control program, when executed by a processor, implements the steps of the oil return control method described above.

Referring to fig. 6, fig. 6 is a block diagram of an oil return control device according to a first embodiment of the present invention.

As shown in fig. 6, an oil return control device according to an embodiment of the present invention includes:

the compressor 10 is tested for determining the compressor in an oil starvation condition in the air conditioner system.

And acquiring a compressor 20, configured to acquire a current first operating frequency of the compressor in the oil shortage state when the number of the compressors in the oil shortage state is less than the total number of the compressors in the air conditioner system.

In the present embodiment, since the compressor that does not need to be oil-returned, that is, the compressor that is not in the oil-deficient state is also controlled while oil is returned to the compressor that is in the oil-deficient state, it is necessary to ensure that at least one or more compressors that are not in the oil-deficient state exist in the entire air conditioner system. In this embodiment, the total number of the compressors in the air conditioner system and the number of the compressors in the oil shortage state are obtained, the total number is compared with the number of the compressors in the oil shortage state, if the number of the compressors in the oil shortage state is smaller than the total number of the compressors, it is indicated that the compressors not in the oil shortage state exist in the air conditioner system, and in this case, the current operating frequency, that is, the first operating frequency of the compressors in the state is obtained. Further, if the compressors in the oil starvation state are equal to the total number of compressors, oil return control is not performed on the compressors in the air conditioner system.

And the control module 30 is configured to increase the compressor in the oil shortage state from the first operating frequency to a target frequency, so that the compressor in the oil shortage state performs oil return.

The obtaining compressor 20 is further configured to obtain a current second operating frequency of a compressor that is not in an oil-starvation state in the air conditioner system.

And the calculation module 40 is used for determining the current load of the air conditioner system according to the second operation frequency and the target frequency.

It should be noted that the frequency of the compressor determines the load of the entire air conditioner system, and the current load corresponding to the air conditioner system may be determined according to the current operating frequency (second operating frequency) of the compressor that is not in the oil shortage state and the current operating frequency (target frequency) of the compressor that is in the oil shortage state.

The control module 30 is further configured to control the operation of the compressor that is not in the oil shortage state according to the current load.

In the embodiment, by determining the compressors in the oil shortage state in the air conditioner system, when the number of the compressors in the oil shortage state is smaller than the total number of the compressors in the air conditioner system, the compressors in the oil shortage state are increased to the target frequency from the first operation frequency, so that the compressors in the oil shortage state return oil, and the current second operation frequency of the compressors in the air conditioner system which are not in the oil shortage state is obtained; and determining the current load of the air conditioner system according to the second operating frequency and the target frequency, controlling the operation of the compressor which is not in the oil shortage state according to the current load, and controlling the operation of the compressor which is not in the oil shortage state according to the current load of the air conditioner system while performing oil return on the compressor which is in the oil shortage state, so that the load of the air conditioner system is prevented from fluctuating when the compressor returns oil, and the comfort of a user is improved.

It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.

It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.

In addition, technical details that are not described in detail in this embodiment may refer to the oil return control method provided in any embodiment of the present invention, and are not described herein again.

Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An oil return control method, characterized in that the oil return control method comprises:

2. The oil return control method according to claim 1, wherein before raising the compressor in the oil-starved state from the first operating frequency to a target frequency to return oil to the compressor in the oil-starved state, the method further comprises:

3. The oil return control method according to claim 1, wherein the controlling the operation of the compressor not in the oil-starved state according to the current load includes:

4. The oil return control method according to claim 3, wherein before controlling the operation of the compressor not in the oil shortage state according to the load difference and a preset strategy, the method further comprises:

acquiring the working state of a compressor in the air conditioner system;

5. The oil return control method according to claim 4, wherein the controlling the operation of the compressor not in the oil shortage state according to the load difference and a preset strategy comprises:

6. The oil return control method according to claim 4, wherein the controlling the operation of the compressor not in the oil shortage state according to the load difference and a preset strategy comprises:

7. The oil return control method of claim 6, wherein before shutting down the compressor that is not in the oil starvation state, further comprising:

8. The oil return control method according to any one of claims 1 to 7, wherein, after the controlling the operation of the compressor not in the oil-starved state according to the current load, the method further comprises:

9. An oil return control device, characterized in that, oil return control device includes:

10. An oil return control apparatus, characterized in that, the oil return control apparatus includes: a memory, a processor and an oil return control program stored on the memory and executable on the processor, the oil return control program being configured to implement the steps of the oil return control method according to any one of claims 1 to 8.

11. A storage medium having stored thereon an oil return control program, the oil return control program when executed by a processor implementing the steps of the oil return control method according to any one of claims 1 to 8.