CN114279120A - Oil return control method and device and air conditioning system - Google Patents
Oil return control method and device and air conditioning system Download PDFInfo
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- CN114279120A CN114279120A CN202111549722.9A CN202111549722A CN114279120A CN 114279120 A CN114279120 A CN 114279120A CN 202111549722 A CN202111549722 A CN 202111549722A CN 114279120 A CN114279120 A CN 114279120A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004378 air conditioning Methods 0.000 title claims abstract description 45
- 230000015654 memory Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 19
- 238000005057 refrigeration Methods 0.000 abstract description 15
- 239000003921 oil Substances 0.000 description 105
- 239000003507 refrigerant Substances 0.000 description 24
- 230000001276 controlling effect Effects 0.000 description 19
- 239000007788 liquid Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention provides an oil return control method, a control device and an air conditioning system, relates to the technical field of air conditioners, and solves the technical problem that oil shortage of a compressor is caused due to insufficient oil return of the air conditioning system. The oil return control method comprises the following steps: acquiring the cabinet internal temperatures of all indoor units; determining the lowest limit value of the operation opening of a valve body on a flow path of an indoor unit according to the temperature in the cabinet of the indoor unit and the preset temperature; and controlling the valve body to operate in a state that the operation opening degree is greater than or equal to the corresponding minimum limit value. According to the invention, the lowest limit value of the corresponding valve body can be set according to the temperature in the cabinet of the indoor unit and the preset temperature, so that the refrigeration effect of the indoor unit is ensured, oil can be more sufficiently and timely returned to the compressor, and the phenomenon that the inside of the compressor is lack of oil and the inside of the compressor is greatly abraded is prevented.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an oil return control method, an oil return control device and an air conditioning system.
Background
An air conditioner in the prior art takes a multi-connected showcase refrigeration system as an example, as shown in fig. 1, fig. 1 is a schematic structural diagram of the multi-connected showcase refrigeration system in the prior art, the system is divided into an outdoor part and an indoor part, the outdoor part is a condensing unit (outdoor unit), the indoor part is a plurality of showcases (indoor units 103), and the outdoor unit and the indoor units are connected with a return pipe through liquid supply pipes. In the indoor unit, a plurality of showcases are connected in parallel in a system pipeline, and a valve body 104, such as an electronic expansion valve, is arranged on a branch pipeline where each showcase is located, and is used for controlling the flow rate of refrigerant entering an evaporator in the corresponding showcase.
In a refrigeration system, when a compressor works, when a part of refrigeration oil in the compressor is very quickly discharged from the compressor after being compressed by high-temperature and high-pressure gas refrigerant, oil vapor and oil drop particles are easily formed and are discharged together with the gas refrigerant. When the lubricating oil enters the condenser and the evaporator along with the refrigerant, a layer of oil film is formed on the heat transfer wall surface, so that the thermal resistance is increased, the heat transfer effect of the condenser and the evaporator is reduced, and the refrigeration effect is reduced; and simultaneously, the compressor is lack of oil, the phenomenon that the compressor is burnt due to the lack of oil occurs, and the service life of the compressor is further influenced.
In the prior art, the oil return of the compressor is realized by adopting the following structure: referring to fig. 1, when the compressor is in operation, the refrigeration oil carried along with the exhaust gas is separated by the oil separator 105, enters the gas-liquid separator 107 through the oil return capillary tube 106, enters the suction port of the compressor 101 from the gas-liquid separator 107, and then returns to the compressor 101.
The applicant has found that the prior art has at least the following technical problems: in the process of oil return of the compressor, the situation that the lubricating oil cannot continuously return to the compressor still exists, and the main reason is that part of the oil enters the condenser and the evaporator along with the refrigerant, the oil return is insufficient, and the oil cannot flow back to the compressor through the oil return pipeline, so that the oil shortage of the compressor is caused, and the heat transfer effect of the heat exchanger is influenced.
Disclosure of Invention
The invention aims to provide an oil return control method, a control device and an air conditioning system, which aim to solve the technical problem that the oil return of the air conditioning system is insufficient in the prior art, so that the compressor is lack of oil; the technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an oil return control method, which comprises the following steps:
acquiring the cabinet internal temperatures of all indoor units;
determining the lowest limit value of the operation opening of a valve body on a flow path of the indoor unit according to the temperature in the cabinet of the indoor unit and the preset temperature;
and controlling the valve body to operate in a state that the operation opening degree is greater than or equal to the corresponding minimum limit value.
Preferably, the determining the lowest limit value of the operating opening degree of the valve body on the flow path where the indoor unit is located according to the cabinet internal temperature of the indoor unit and the preset temperature includes:
if the temperature in the cabinet of the indoor unit is higher than the preset temperature, controlling the lowest limit value of the operation opening degree of a valve body on a flow path where the indoor unit is located to be a first preset limit value;
and if the temperature in the cabinet of the indoor unit is less than or equal to the preset temperature, controlling the lowest limit value of the operation opening degree of the valve body on the flow path of the indoor unit to be a second preset limit value, wherein the second preset limit value is less than the first preset limit value.
Preferably, the second preset limit is 5% -15% smaller than the first preset limit.
Preferably, said first preset limit is between 40% and 60%; the second preset limit is between 25% and 55%.
Preferably, the indoor units include more than two, and the step of obtaining the cabinet internal temperatures of all the indoor units includes:
and judging whether all the indoor units are started to operate or not, and if not, controlling all the indoor units which are not started to operate.
Preferably, the control method further includes:
and judging whether the accumulated time of the running frequency of the compressor less than or equal to the preset frequency reaches a limited threshold value, and if so, controlling the air conditioning system to enter an oil return mode.
Preferably, said defined threshold is between 2 hours and 5 hours.
Preferably, the controlling the air conditioning system to enter the oil return mode includes: and controlling the running frequency of the compressor to be increased to a preset oil return frequency.
Preferably, the control method further includes:
and judging whether the operation accumulated time for starting oil return of the air conditioning system exceeds a preset time limit value, if so, controlling the air conditioning system to exit an oil return mode.
Preferably, the preset time limit is between 2min and 10 min.
The invention also provides an oil return control device, which comprises:
a detection module: the indoor temperature acquisition unit is used for acquiring the indoor temperatures of all the indoor units;
setting a module: the minimum limit value of the operation opening of the valve body on the flow path of the indoor unit is determined according to the temperature in the cabinet of the indoor unit and the preset temperature;
a control module: and the valve body is used for controlling the valve body to operate in a state that the operation opening degree is greater than or equal to the corresponding minimum limit value.
The present invention also provides an air conditioning system comprising:
one or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of the above-described method.
Compared with the prior art, the oil return control method, the control device and the air conditioning system provided by the invention have the following beneficial effects: due to the fact that the minimum limit value of the operation opening degree of the valve body on the flow path where the indoor unit is located is set, the flow of the refrigerant in the oil return pipeline in the oil return mode can be guaranteed to be large enough, and the oil can be driven to return to the compressor more fully by keeping large flow speed of the refrigerant. However, when the minimum opening limit of the valve body is set, the minimum opening limit should be set according to the temperature in the indoor unit and the preset temperature, for example, when the valve body is applied to a multi-split air conditioning system, the minimum opening limit of the valve body is prevented from being too low, so that too little refrigerant flows into the showcase evaporator, the temperature of the environment where the showcase evaporator is located is too high, and the refrigeration effect is weakened.
According to the oil return control method, the control device and the air conditioning system, the minimum limit value of the operation opening of the corresponding valve body can be set according to the cabinet internal temperature of the indoor unit and the preset temperature, the refrigeration effect of the indoor unit is guaranteed, oil can be more fully and timely returned to the compressor, and the phenomenon that the inside of the compressor is lack of oil and the inside of the compressor is greatly abraded is prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art multiple display case refrigeration system;
FIG. 2 is a schematic flow diagram of a method for controlling oil return according to the present invention;
FIG. 3 is a block diagram schematic of an oil return control device;
fig. 4 is a block diagram schematic of an air conditioner.
In the figure: 101. a compressor; 102. an outdoor unit; 103. an indoor unit; 104. a valve body; 105. an oil separator; 106. an oil return capillary tube; 107. a gas-liquid separator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the invention provides an oil return control method, a control device and an air conditioning system, which can enable oil to flow back into a compressor more fully on the premise of ensuring the refrigeration effect of an indoor unit.
The technical solution provided by the present invention is explained in more detail below with reference to fig. 1 to 4.
In the prior art, the oil return of the compressor 101 is realized by adopting the following structure: referring to fig. 1, when the compressor 101 is in operation, the refrigeration oil carried along with the exhaust gas is separated by the oil separator 105, enters the gas-liquid separator 107 through the oil return capillary tube 106, enters the suction port of the compressor 101 from the gas-liquid separator 107, and then returns to the compressor 101.
The oil separator 105, the oil return capillary tube 106, and the gas-liquid separator 107 are disposed in an oil return line. During the oil return process of the compressor 101, there is still a situation that the lubricating oil cannot continuously return to the compressor 101, which results in the oil shortage of the compressor 101 and affects the heat transfer effect of the heat exchanger.
Example one
In view of the above problem, as shown in fig. 2, the present embodiment provides an oil return control method, where the control method includes: acquiring the cabinet internal temperatures of all indoor units 103; determining the lowest limit value of the operation opening of a valve body 104 on a flow path of an indoor unit 103 according to the cabinet internal temperature of the indoor unit 103 and the preset temperature; the control valve body 104 is operated in a state where the operation opening degree is greater than or equal to the corresponding minimum limit value.
For the multi-split air conditioning system, a plurality of showcases are connected in parallel in a system pipeline, a valve body 104 is arranged on a branch pipeline where each showcase is located, and the valve body 104 can be an electronic expansion valve specifically and is used for controlling the flow rate of refrigerant entering an evaporator in the corresponding showcase.
In the embodiment, by setting the minimum limit value of the operation opening degree of the valve body 104 on the flow path where the showcase is located, the valve body 104 on the flow path where the showcase is located is operated in a state where the operation opening degree is greater than or equal to the minimum limit value, so that the refrigerant flow in the circulation pipeline of the air conditioning system is as large as possible, and the oil can be driven to more sufficiently return to the compressor 101 through a large refrigerant flow rate.
In the oil return control method of this embodiment, because the minimum limit value of the operation opening of the valve body 104 on the flow path where the indoor unit 103 is located is set, it can be ensured that the flow rate of the refrigerant in the system pipeline is sufficiently large in the oil return mode, and the oil can be more sufficiently returned to the compressor 101 by maintaining a large flow rate of the refrigerant. However, when the minimum limit of the opening degree of the valve body 104 is set, the minimum limit should be set according to the temperature of the environment where the heat exchanger is located and the preset temperature, for example, when the valve body 104 is applied to a multi-split air conditioning system, the minimum limit of the operation opening degree of the valve body 104 is prevented from being too small, so that too little refrigerant flows into the showcase evaporator, the temperature of the environment where the showcase evaporator is located is too high, and the refrigeration effect is weakened.
According to the oil return control method, the minimum limit value of the operation opening of the corresponding valve body 104 is set according to the cabinet temperature of the indoor unit 103 and the preset temperature, so that the refrigeration effect of the indoor unit 103 is ensured, oil can be more sufficiently and timely returned to the compressor 101, and the phenomenon that the inside of the compressor 101 is lack of oil to cause large abrasion of the inside of the compressor 101 is avoided.
Referring to fig. 2, the following provides a specific embodiment of an oil return control method, which includes:
step S10: parameters of all the indoor units 103 and the outdoor units 102 are acquired.
The parameters include: the operation frequency of the compressor 101, the cumulative time when the operation frequency of the compressor 101 is less than or equal to the preset frequency, and the cabinet internal temperature of the indoor unit 103 (specifically, when the method is applied to a multi-connected air conditioning system, the ambient temperature in the display cabinet is obtained).
Step S20: it is determined whether the cumulative time that the operating frequency of the compressor 101 is less than or equal to the preset frequency reaches a defined threshold.
Since the compressor 101 operates at a frequency lower than the predetermined frequency for a long time, oil in the air conditioning system may be accumulated in the evaporator and the pipeline, and the compressor 101 may be starved of oil due to the long-time operation, and the compressor 101 may be easily damaged. By using the accumulated low-frequency operation of the compressor 101 as a determination condition, oil can be returned to the compressor 101 in time, and the lack of oil in the compressor 101 can be prevented.
Step S30: if so, controlling the air conditioning system to enter an oil return mode; if not, the compressor 101 is controlled to continue to operate.
When the cumulative time that the operating frequency of the compressor 101 is less than or equal to the preset frequency reaches a limited threshold value, the air-conditioning system is controlled to enter an oil return mode, oil in an evaporator and a pipeline of the air-conditioning system can be brought back to the compressor 101 through flowing refrigerants, and oil shortage in the compressor 101 is prevented.
The preset frequency is further set according to practical experience, which is not described herein. As an alternative embodiment, the above defined threshold is between 2 hours and 5 hours.
When the unit of the air conditioning system is operated, once the operating frequency of the compressor 101 is higher than the preset frequency and the compressor is continuously operated for t times or more than the oil return, the operating time of the compressor 101 starts to be accumulated again.
Step S40: controlling the frequency of the compressor 101 to be increased to the oil return frequency; wherein, the oil return frequency is higher than the preset frequency of the compressor 101.
After the compressor 101 enters the oil return mode, the working frequency of the compressor 101 is controlled to be increased, so that the flow speed of the refrigerant in the pipeline of the air conditioning system can be increased, oil can be conveniently brought back to the compressor 101 through the refrigerant flowing at a high speed, and the oil return effect is more sufficient.
Step S50: and judging whether all the indoor units 103 are started to operate, and if not, controlling all the indoor units 103 which are not started to operate.
When the indoor units 103 include a plurality of indoor units, that is, the air conditioning system is a multi-split air conditioning system, as long as there is an indoor unit 103 (such as a showcase) in the multi-split air conditioning system in a shutdown state or a shutdown state, the indoor unit 103 (such as the showcase) cannot participate in oil return, so that the oil return is insufficient, and an oil film is formed on an inner wall surface of an evaporator of the indoor unit 103, thereby reducing a heat conductivity coefficient, affecting a heat transfer effect, and reducing a cooling efficiency of the indoor unit 103.
Therefore, in the oil return control method of this embodiment, by obtaining the operation states of all the indoor units 103 in the air conditioning system, if there is an indoor unit 103 in a shutdown state or a shutdown state, the indoor unit 103 is controlled to be turned on to operate, so that all the indoor units 103 in the air conditioning system (a multi-connected air conditioning system is all the showcases) are ensured to participate in oil return, oil return is more sufficient, and oil is prevented from remaining in a certain indoor unit 103 to affect the heat exchange effect of the heat exchanger in the indoor unit 103.
Step S60: and judging whether the cabinet internal temperature of the indoor unit 103 is greater than a preset temperature.
It should be understood that the refrigerant flow rate in the oil return mode is sufficiently large, and a larger refrigerant flow rate can bring more oil back to the compressor 101. If the flow rate of the refrigerant in the system pipeline is too high, the refrigerant entering the branch of the indoor unit 103 is reduced, which may affect the cooling effect of the indoor unit 103.
Therefore, in the oil return control method of this embodiment, by determining the cabinet internal temperature of the indoor unit 103 and the preset temperature, the minimum value of the operation opening of the valve body 104 can be regulated and controlled according to the cabinet internal temperature of the indoor unit 103 and the preset temperature of the indoor unit 103, so as to prevent the cabinet internal temperature of the indoor unit 103 from failing to reach the preset temperature, and ensure the oil return effect at the same time.
Step S70: if the cabinet internal temperature of the indoor unit 103 is higher than the preset temperature, controlling the lowest limit value of the operation opening degree of the valve body 104 on the flow path where the indoor unit 103 is located to be a first preset limit value; at this time, the valve body 104 is operated in a state where the operation opening degree is greater than or equal to a first preset limit value;
if the cabinet internal temperature of the indoor unit 103 is less than or equal to the preset temperature, controlling the lowest limit value of the operation opening degree of the valve body 104 on the flow path where the indoor unit 103 is located to be a second preset limit value, wherein the second preset limit value is less than the first preset limit value; at this time, the valve body 104 is operated in a state where the operation opening degree is greater than or equal to the first preset limit value.
Wherein the second preset limit is 5-15% smaller than the first preset limit. Specifically, for example, a first preset limit may be set between 40% and 60%, such as 55%; accordingly, a second predetermined limit may be set between 30% and 50%, such as 45%.
When the multi-connected air conditioning system is applied, under the cooling working condition, when the cabinet internal temperature (the display cabinet internal temperature) of the indoor unit 103 is higher than the preset temperature, it is described that the cabinet internal temperature (the display cabinet internal temperature) of the indoor unit 103 needs to be further reduced to achieve the target cooling effect, therefore, compared with the case that the cabinet internal temperature of the indoor unit 103 is lower than or equal to the preset temperature, the minimum limit value of the operation opening degree of the valve body 104 on the branch where the indoor unit 103 is located should be properly increased, so that more refrigerants can enter the indoor unit 103 (the display cabinet), it is ensured that the temperature of the indoor unit 103 (the display cabinet) can be further reduced to the preset temperature, and the cooling effect is ensured.
When the temperature in the indoor unit 103 is lower than the preset temperature, it is described that the temperature in the indoor unit 103 (display cabinet) is too cold and is already lower than the preset temperature, so that in order to make the temperature in the indoor unit (display cabinet) meet the preset temperature, the minimum limit of the operation opening of the valve body 104 on the flow path where the indoor unit 103 is located should be controlled to be properly reduced, that is, the second preset limit is smaller than the first preset limit, so that less refrigerant enters the indoor unit 103 (display cabinet), the indoor unit 103 is prevented from being cooled too fast, the flow rate of the refrigerant in the system pipeline for carrying oil to return to the compressor 101 is ensured to be large, and oil return is more sufficient.
Step S80: and judging whether the operation accumulated time for starting oil return of the air conditioning system exceeds a preset time limit value or not, and if so, controlling the air conditioning system to exit an oil return mode. Wherein, the preset time limit value is between 2min and 10min, and the specific value is not limited.
And when the accumulated operation time for starting oil return of the air conditioning system exceeds a preset time limit value, the oil return is sufficient, and the air conditioning system is quitted from the oil return mode at the moment to ensure that the air conditioning system continues to normally operate.
In the oil return control method of the present embodiment, in the oil return mode, if the defrosting condition is satisfied, oil return is preferentially performed, and the defrosting mode is immediately entered after the oil return is completed. After entering the oil return mode, the shutdown condition is not detected, that is, the shutdown mode is not entered when the indoor units 103 reach the condition, so that the startup operation of all the indoor units 103 is ensured, and the oil return is ensured to be more sufficient.
According to the oil return control method, the minimum limit value of the operation opening of the corresponding valve body 104 is set according to the cabinet temperature of the indoor unit 103 and the preset temperature, so that the refrigeration effect of the indoor unit 103 is ensured, oil can be more sufficiently and timely returned to the compressor 101, and the phenomenon that the inside of the compressor 101 is lack of oil to cause large abrasion inside the compressor 101 is avoided. In the multi-connected air conditioning system, all indoor units 103, such as the showcases, can participate in oil return, and the sufficiency of the oil return is ensured.
Example two
The present embodiment further provides an oil return control device 2, including:
the detection module 201: the indoor temperature acquisition unit is used for acquiring the indoor temperatures of all the indoor units 103;
the setting module 202: the minimum limit value of the operation opening of the valve body 104 on the flow path of the indoor unit 103 is determined according to the cabinet internal temperature of the indoor unit 103 and the preset temperature;
the control module 203: for controlling the valve body 104 to operate in a state where the operation opening degree is greater than or equal to the corresponding minimum limit value.
With regard to the oil return control device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the above embodiment of the related method, and will not be elaborated here.
EXAMPLE III
The present embodiment also provides an air conditioning system 3, including:
one or more memories 301 having executable programs stored thereon;
one or more processors 302 for executing the executable programs in the memory to implement the steps of the above-described method.
The memory may include, but is not limited to, various modules of the air conditioner control device. In addition, other module units in the air conditioner control device may also be included, but are not limited to these, and are not described in detail in this example.
With regard to the air conditioner in the above-mentioned embodiment, the specific manner of executing the program in the memory by the processor has been described in detail in the embodiment related to the method, and will not be elaborated here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "plurality" means at least two unless otherwise specified.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, and further, as used herein, connected may include wirelessly connected; the term "and/or" is used to include any and all combinations of one or more of the associated listed items.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments or portions of code which include one or more executable instructions for implementing specific logical functions or steps of a process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (12)
1. An oil return control method, characterized in that the control method comprises:
acquiring the temperature in the indoor unit;
determining the lowest limit value of the operation opening of a valve body on a flow path of the indoor unit according to the temperature in the cabinet of the indoor unit and the preset temperature;
and controlling the valve body to operate in a state that the operation opening degree is greater than or equal to the corresponding minimum limit value.
2. The oil return control method according to claim 1, wherein the determining of the lowest limit value of the operating opening degree of the valve body in the flow path in which the indoor unit is located according to the cabinet internal temperature of the indoor unit and the preset temperature includes:
if the temperature in the cabinet of the indoor unit is higher than the preset temperature, controlling the lowest limit value of the operation opening degree of a valve body on a flow path where the indoor unit is located to be a first preset limit value;
and if the temperature in the cabinet of the indoor unit is less than or equal to the preset temperature, controlling the lowest limit value of the operation opening degree of the valve body on the flow path of the indoor unit to be a second preset limit value, wherein the second preset limit value is less than the first preset limit value.
3. The oil return control method according to claim 2, wherein the second preset limit is 5% -15% smaller than the first preset limit.
4. The oil return control method according to claim 2 or 3, characterized in that the first preset limit is between 40% -60%; the second preset limit is between 25% and 55%.
5. The oil return control method according to claim 1, wherein the number of the indoor units is two or more, and the obtaining of the cabinet internal temperature of the indoor unit includes:
and judging whether all the indoor units are started to operate or not, and if not, controlling all the indoor units which are not started to operate.
6. The oil return control method according to claim 1, characterized by further comprising:
and judging whether the accumulated time of the running frequency of the compressor less than or equal to the preset frequency reaches a limited threshold value, and if so, controlling the air conditioning system to enter an oil return mode.
7. The oil return control method of claim 6, wherein the defined threshold is between 2 hours and 5 hours.
8. The oil return control method of claim 6, wherein the controlling the air conditioning system to enter the oil return mode comprises: and controlling the running frequency of the compressor to be increased to a preset oil return frequency.
9. The oil return control method according to claim 6, characterized by further comprising:
and judging whether the operation accumulated time for starting oil return of the air conditioning system exceeds a preset time limit value, if so, controlling the air conditioning system to exit an oil return mode.
10. The oil return control method of claim 9, wherein the preset time limit is between 2min and 10 min.
11. An oil return control device, characterized by comprising:
a detection module: the indoor temperature acquisition unit is used for acquiring the indoor temperatures of all the indoor units;
setting a module: the minimum limit value of the operation opening of the valve body on the flow path of the indoor unit is determined according to the temperature in the cabinet of the indoor unit and the preset temperature;
a control module: and the valve body is used for controlling the valve body to operate in a state that the operation opening degree is greater than or equal to the corresponding minimum limit value.
12. An air conditioning system, comprising:
one or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of the method of any one of claims 1-10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111549722.9A CN114279120A (en) | 2021-12-17 | 2021-12-17 | Oil return control method and device and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111549722.9A CN114279120A (en) | 2021-12-17 | 2021-12-17 | Oil return control method and device and air conditioning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264782A (en) * | 2022-08-01 | 2022-11-01 | 宁波奥克斯电气股份有限公司 | Air conditioner oil return control method and device, multi-split air conditioner and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105371531A (en) * | 2015-11-30 | 2016-03-02 | 珠海格力电器股份有限公司 | Method and system for low-frequency oil return control for air conditioner |
| CN109631248A (en) * | 2018-11-16 | 2019-04-16 | 青岛海尔空调电子有限公司 | A kind of multi-joint mechanism cold oil return method for noise reduction control and system |
| WO2019087401A1 (en) * | 2017-11-06 | 2019-05-09 | ダイキン工業株式会社 | Air conditioning device |
| CN110375411A (en) * | 2019-07-17 | 2019-10-25 | 广东Tcl智能暖通设备有限公司 | Starting of air conditioner control method, air-conditioning and storage medium |
| CN113280541A (en) * | 2021-06-29 | 2021-08-20 | 江苏拓米洛环境试验设备有限公司 | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
-
2021
- 2021-12-17 CN CN202111549722.9A patent/CN114279120A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105371531A (en) * | 2015-11-30 | 2016-03-02 | 珠海格力电器股份有限公司 | Method and system for low-frequency oil return control for air conditioner |
| WO2019087401A1 (en) * | 2017-11-06 | 2019-05-09 | ダイキン工業株式会社 | Air conditioning device |
| CN109631248A (en) * | 2018-11-16 | 2019-04-16 | 青岛海尔空调电子有限公司 | A kind of multi-joint mechanism cold oil return method for noise reduction control and system |
| CN110375411A (en) * | 2019-07-17 | 2019-10-25 | 广东Tcl智能暖通设备有限公司 | Starting of air conditioner control method, air-conditioning and storage medium |
| CN113280541A (en) * | 2021-06-29 | 2021-08-20 | 江苏拓米洛环境试验设备有限公司 | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264782A (en) * | 2022-08-01 | 2022-11-01 | 宁波奥克斯电气股份有限公司 | Air conditioner oil return control method and device, multi-split air conditioner and storage medium |
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