CN114151992A - Compressor oil return control method and device and air conditioner - Google Patents

Compressor oil return control method and device and air conditioner Download PDF

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Publication number
CN114151992A
CN114151992A CN202111581172.9A CN202111581172A CN114151992A CN 114151992 A CN114151992 A CN 114151992A CN 202111581172 A CN202111581172 A CN 202111581172A CN 114151992 A CN114151992 A CN 114151992A
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China
Prior art keywords
oil
compressor
temperature
separator
content
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Pending
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CN202111581172.9A
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Chinese (zh)
Inventor
李赛
唐海洋
高雅
魏朋朋
马壮壮
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202111581172.9A priority Critical patent/CN114151992A/en
Publication of CN114151992A publication Critical patent/CN114151992A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/01—Heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/03—Oil level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressor (AREA)

Abstract

The invention provides a compressor oil return control method, a compressor oil return control device and an air conditioner, relates to the technical field of compressors, and provides a novel compressor oil return control method. The method comprises detecting the content of frozen oil in an oil separator connected with a compressor; and if the content of the refrigeration oil in the oil separator reaches a set content value, controlling to convey the refrigeration oil in the oil separator to the compressor. The temperature of the refrigeration oil in the compressor is detected, and the refrigeration oil is prevented from being lower than a set temperature value by starting a heating device on the compressor. The invention judges whether the compressor is lack of oil or not by detecting the content of the frozen oil in the oil separator, has obvious detection mode effect, is easy to realize, and can accurately judge whether the compressor is lack of oil or not; the temperature of the oil in the compressor is detected, the oil temperature is determined to be above a set value, and the liquid is prevented from being carried by the compressor, so that the refrigerant and the oil are mixed and lose the lubricating effect.

Description

Compressor oil return control method and device and air conditioner
Technical Field
The invention relates to the technical field of compressors, in particular to a compressor oil return control method, a compressor oil return control device and an air conditioner.
Background
In the current direct-current frequency conversion technology, a frequency conversion compressor is a main core component and a component with a high failure rate. In the inverter air conditioning unit, the running frequency of the compressor is changed, and particularly when the compressor works at frequent starting and stopping, the common problem is that the oil shortage of the compressor causes shaft grinding. Although an oil separator is often added in the unit, the oil shortage of the compressor can be avoided to a certain extent, and the oil return detection of the system is rarely carried out in the current control.
The prior art discloses an oil return control method of a direct-current frequency-conversion multi-split air conditioner, wherein an oil return temperature sensor is arranged on an oil return pipeline of a compressor, whether an oil return is needed by a unit is judged according to temperature change, but the temperature change is delayed, and the temperature change is caused by other factors, such as insufficient opening degree of an electronic expansion valve. The prior art discloses an oil return control method and an oil return control device of an air conditioner and the air conditioner, wherein oil return is controlled by setting the starting and stopping times, and the oil level is not directly detected.
Disclosure of Invention
The invention aims to provide a compressor oil return control method, a compressor oil return control device and an air conditioner, and provides a novel compressor oil return control method. 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 a compressor oil return control method, which comprises the following steps: detecting the content of oil in an oil separator connected with a compressor; and if the oil content in the oil separator reaches a set content value, controlling to convey the oil in the oil separator to the compressor.
Further, when it is detected that a volume v of oil in the oil separator satisfies v>v2At that time, the system enters a forced oil return mode, where v2Is a preset value in the system.
Further, when it is detected that a volume v of oil in the oil separator satisfies v<v1When the system is in the oil return-free mode, the system enters the oil return-free mode; wherein v is1Is a default value in the system, and v2>v1。
Further, when it is detected that a volume v of oil in the oil separator satisfies v2<v<v1When the system enters the optional mode; the optional modes are explained as follows: the user can select the system to return oil or not, and the system defaults to return oil or not return oil.
Further, the following is specifically described for detecting the oil content in the oil separator: detecting the height h from the oil in the oil separator to a detection device, and calculating the oil content v in the oil separator according to the detected height h; and v is s (H-H), s is the bottom area of the oil separator, and H is the distance value from the distance detection device to the bottom surface of the oil separator.
Further, an ultrasonic sensor positioned at the top of the oil separator is arranged inside the oil separator and used for measuring the height h of oil in the oil separator from the top surface of the oil separator.
Further, the temperature of the oil in the compressor is detected, and the oil temperature is prevented from being lower than a set temperature value by starting a heating device on the compressor.
Further, when the temperature T of the oil in the compressor is less than a preset temperature value T1When the compressor is started, the heating device is controlled to be started to heat oil in the compressor; if the temperature T of the oil in the compressor is detected to meet T1<T<T2And when the temperature is higher than the preset temperature, controlling the heating device to be switched off.
A control device for controlling return of refrigeration oil to a compressor, the control device comprising: the content detection module is used for detecting the content of oil in the oil separator; and the control module is used for controlling the oil in the oil separator to be conveyed to the compressor when the oil content in the oil separator is judged to be higher than a preset value.
Further, the control device further includes: the temperature detection module is used for detecting the temperature of the oil in the compressor; when the oil temperature of the oil in the compressor is lower than a preset temperature value, the control module can control the heating device on the compressor to start so as to heat the oil in the compressor.
The present invention provides an air conditioner, comprising:
one or more memories having executable programs stored thereon;
one or more processors configured to execute the executable programs in the memory to implement the steps of the method.
The invention provides a compressor oil return control method, which comprises the following steps: detecting the content of frozen oil in an oil separator connected with a compressor; and if the content of the refrigeration oil in the oil separator reaches a set content value, controlling to convey the refrigeration oil in the oil separator to the compressor. Under normal conditions, the compressor is filled with oil volume v when leaving factory0The greater the content of the refrigeration oil in the oil separator, the less the amount of oil remaining inside the compressor. The invention judges whether the compressor is lack of oil or not by detecting the content of the frozen oil in the oil separator, has obvious detection mode effect, is easy to realize, and can accurately judge whether the compressor is lack of oil or not; the problem that the frequency converter controls output current to suddenly change to damage the frequency converter due to shaft grinding of the compressor caused by oil return faults is avoided.
The preferred technical scheme of the invention can at least produce the following technical effects:
the temperature of the refrigeration oil in the compressor is detected, and the refrigeration oil is prevented from being lower than a set temperature value by starting a heating device on the compressor. The temperature sensor is arranged in the bottom of the compressor and used for collecting the oil temperature T and transmitting signals to the controller for processing through a signal wire. The temperature of the oil in the compressor is detected, the oil temperature is determined to be above a set value, and the liquid is prevented from being carried by the compressor, so that the refrigerant and the oil are mixed and lose the lubricating effect.
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 refrigerant oil return control device of a compressor according to an embodiment of the present invention;
fig. 2 is a block diagram of a structure of a refrigerant oil return control device of a compressor according to an embodiment of the present invention;
fig. 3 is a control flowchart of a compressor oil return control method according to an embodiment of the present invention.
FIG. 1-compressor; 2-a condenser; 3-an evaporator; 4-an oil separator; 5-an electronic expansion valve; 6-gas-liquid separator; 7-an ultrasonic sensor; 8-a temperature sensor; 9-a controller; 10-a touch screen; 11-a solenoid valve; 12-a fan.
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.
The invention provides a compressor oil return control method, which comprises the following steps: detecting the content of (frozen) oil in an oil separator 4 connected to the compressor 1; when the content of the refrigerant oil in the oil separator 4 reaches a set content value, the refrigerant oil in the oil separator 4 is controlled to be delivered to the compressor 1. Under normal conditions, the compressor 1 is filled with oil volume v when leaving the factory0The larger the content of the refrigerant oil in the oil separator 4, the smaller the amount of oil remaining in the compressor 1. The invention judges whether the compressor 1 is lack of oil or not by detecting the content of the refrigeration oil in the oil separator 4, the detection mode has obvious effect and is easy to realize, and whether the compressor is lack of oil or not can be accurately judged; avoid the compressor grinding shaft caused by oil return fault, thereby causing the frequency converter to controlThe output current suddenly changes to damage the frequency conversion controller.
As an alternative embodiment, the relationship between the content of the refrigeration oil in the oil separator 4 and the return oil of the refrigeration oil is as follows: when the volume v of the refrigerant oil in the oil separator 4 satisfies v>v2At that time, the system enters a forced oil return mode, where v2Is a preset value in the system. When detecting the freezing oil v in the oil separator 4>v2When the compressor 1 is in oil shortage, a forced oil return mode needs to be executed, otherwise, the shaft can be abraded, and the oil return mode is not influenced by frequent startup and shutdown and external environment. The controller 9 rapidly adjusts to the oil return mode according to the characteristics of the current operation, and opens the oil return solenoid valve 11. The bottom of the compressor 1 is provided with an oil pump, the bottom of the oil separator 4 is provided with an oil return pipeline, an oil discharge port of the oil separator 4 is connected with an oil return port of the compressor 1 through the oil return pipeline, the oil return pipeline is provided with an electromagnetic valve 11, and the refrigeration oil in the oil separator 4 flows into the compressor 1 through the oil return pipeline.
When the volume v of the refrigerant oil in the oil separator 4 satisfies v<v1When the system is in the oil return-free mode, the system enters the oil return-free mode; wherein v is1Is a default value in the system, and v2>v1. When the volume v of the refrigerant oil in the oil separator 4 satisfies v2<v<v1When the system enters the optional mode; regarding the alternative modes, the following are explained: the user can select the system to return the refrigeration oil or not return the refrigeration oil, and the system defaults to return the refrigeration oil or not return the refrigeration oil. When detecting the volume v of the refrigeration oil in the oil separator 4<v1When the compressor works, the electromagnetic valve 11 is closed without influencing the work of the compressor; detecting the volume v of the refrigeration oil in the oil separator 42<v<v1The compressor is in an optional mode, a user can select oil return, when oil return is selected, the electromagnetic valve 11 is opened by the controller, performance priority (namely oil return is not performed, the compressor normally runs) can be selected, the system is set to default to be oil return of the refrigeration oil, and reliability is guaranteed.
The content of the frozen oil in the oil separator 4 is specifically described as follows: detecting the distance (height) h from the frozen oil in the oil separator 4 to a detection device, and calculating the content v of the frozen oil in the oil separator 4 according to the detected distance h; where v is s (H-H), s is the bottom area of the oil separator 4, and H is the distance from the detection device to the bottom surface of the oil separator 4. Inside the oil separator 4, a distance detecting means, preferably an ultrasonic sensor 7, is provided at the top of the oil separator 4, the ultrasonic sensor 7 being configured to measure the height h of the frozen oil inside the oil separator 4 from the ultrasonic sensor 7. An ultrasonic sensor 7 is added on the top of the oil separator 4, the ultrasonic sensor emits sound waves, the time t from emission to reception is calculated, the speed v of the sound waves propagating in the air is known, the distance H can be calculated to be vt/2, the height delta H of the oil surface is H-H, the bottom area s of the oil separator 4 is obtained, and the volume v of the oil in the oil separator 4 is s delta H. The ultrasonic sensor 7 transmits the acquired signal to the signal conditioning circuit, converts the signal into a 4-20mA signal and transmits the signal to the controller 9 for calculation, so that the volume v of the oil in the oil separator 4 is obtained, the oil return is controlled, and meanwhile, the data is transmitted to the touch screen 10 for display through an RS485 signal for a user to check.
As an alternative embodiment, the temperature of the refrigeration oil in the compressor 1 is detected, and the refrigeration oil temperature is prevented from falling below the set temperature value by activating a heating device on the compressor 1. The temperature sensor 8 is arranged in the bottom of the compressor and used for collecting the oil temperature T and transmitting signals to the controller 9 through signal lines for processing. The temperature of the oil in the compressor is detected, the oil temperature is determined to be above a set value, and the liquid is prevented from being carried by the compressor, so that the refrigerant and the oil are mixed and lose the lubricating effect.
When the temperature T of the refrigeration oil in the compressor 1 is less than the preset temperature value T1When the compressor is started, the heating device is controlled to be started to heat the refrigerating oil in the compressor 1; if the temperature T of the refrigeration oil in the compressor 1 is detected to satisfy T1<T<T2And when the temperature is higher than the preset temperature, controlling the heating device to be switched off. Judging whether the oil temperature of the compressor is lower than T1When (too low to freeze the compressor refrigeration oil); if the temperature is too low, the electric heating belt of the compressor is started to heat the refrigeration oil, the temperature of the refrigeration oil rises after heating, and the oil temperature cannot be too high and is less than T2(ii) a The oil temperature is displayed on the touch screen 10 for the user to look up.
Referring to fig. 3, a control flow chart of the oil return control method of the compressor is illustrated:
the system is powered on and preset temperature value T is set1And T2Setting a preset value v of oil mass1And v2；
Detecting the oil temperature in the compressor and determining whether the oil temperature in the compressor 1 is less than T1And displaying the detected temperature value on the touch screen 10; if the oil temperature of the compressor 1 is not less than T1The electric heating belt of the compressor 1 is in a closed state, and if the internal temperature of the compressor 1 is less than T1If the temperature of the oil in the compressor 1 is greater than T, the electric heating belt is started to heat, and whether the temperature of the oil in the compressor 1 is greater than T or not is judged in the heating process1If greater than T1If so, the heating is stopped, and the electric heating belt stops working. In addition, the oil temperature after heating cannot be too high and is less than T2. And displaying the oil temperature on the touch screen for a user to look up until the oil temperature is judged.
Judging the content v of the refrigeration oil in the oil separator 4, and displaying the oil quantity value on the touch screen 10, if v is<v1When the compressor works, the compressor normally runs without being influenced, and the oil return electromagnetic valve 11 is closed; if v is2<v<v1When the compressor is in the selectable mode, oil return can be selected, or performance priority (namely the compressor runs normally) can be selected, and when oil return is selected, the controller 9 opens the oil return electromagnetic valve 11 to form an opening degree I, and the default is oil return, so that the reliability of the system is ensured; if v is>v2When the compressor 1 starts to lack oil, an oil return mode must be executed, otherwise, the shaft may be abraded, at this time, the controller 9 rapidly adjusts to the oil return mode according to the current operation characteristics, opens the oil return electromagnetic valve 11 to form an opening degree two, and detects v in the oil return process<v1When the oil is returned, the oil return solenoid valve 11 is closed. The oil return condition is displayed on the touch screen 10 for the user to look up, and the oil return operation is completed.
A control device for controlling oil return of a compressor, the control device comprising: the content detection module is used for detecting the content of the refrigeration oil in the oil separator 4; a control module for judging whether the content of the refrigeration oil in the oil separator 4 is higher than a preset valueThe refrigeration oil in the separator 4 is sent to the compressor 1. Under normal conditions, the compressor 1 is filled with oil volume v when leaving the factory0The larger the content of the refrigerant oil in the oil separator 4, the smaller the amount of oil remaining in the compressor 1. The invention judges whether the compressor 1 is lack of oil or not by detecting the content of the refrigeration oil in the oil separator 4, the detection mode has obvious effect and is easy to realize, and whether the compressor is lack of oil or not can be accurately judged; the problem that the frequency converter controls output current to suddenly change to damage the frequency converter due to shaft grinding of the compressor caused by oil return faults is avoided.
The content detection module comprises a distance detection device which is used for measuring the distance (height) h from the frozen oil in the oil separator 4 to the distance detection device, the control module is a controller 9, and the control module can calculate the content v of the frozen oil in the oil separator 4 according to the detected height h; where v is s (H-H), s is the bottom area of the oil separator 4, and H is the distance from the detection device to the bottom surface of the oil separator 4. Preferably, the distance detection means is an ultrasonic sensor 7. An ultrasonic sensor 7 is added on the top of the oil separator 4, the ultrasonic sensor emits sound waves, the time t from emission to reception is calculated, the speed v of the sound waves propagating in the air is known, and the distance h can be calculated to be vt/2. Or, the content detection module comprises a liquid level detection device, the liquid level detection device is used for detecting the liquid level of the refrigeration oil in the oil separator 4, and when the liquid level of the refrigeration oil in the oil separator 4 is higher than a preset value, the control module can control the refrigeration oil in the oil separator 4 to be input into the compressor 1.
The bottom of the compressor 1 is provided with an oil pump, the bottom of the oil separator 4 is provided with an oil return pipeline, an oil discharge port of the oil separator 4 is connected with an oil return port of the compressor 1 through the oil return pipeline, the oil return pipeline is provided with an electromagnetic valve 11, and the refrigeration oil in the oil separator 4 flows into the compressor 1 through the oil return pipeline.
The control device also comprises a temperature detection module for detecting the temperature of the refrigeration oil in the compressor, and the temperature detection module is connected with the control module. The heating device on the compressor is connected with the control module, and the control module can control the working state of the heating device according to the temperature signal transmitted by the temperature detection module. When the temperature of the oil in the compressor 1 is lower than a preset temperature value, the control module can control the heating device on the compressor 1 to start so as to heat the refrigeration oil in the compressor 1. The temperature detection module is a temperature sensor 8, the temperature sensor 8 is arranged in the bottom of the compressor and used for collecting oil temperature T, and signals are transmitted to the controller 9 through signal lines to be processed. The temperature of the oil in the compressor is detected, the oil temperature is determined to be above a set value, and the liquid is prevented from being carried by the compressor, so that the refrigerant and the oil are mixed and lose the lubricating effect.
The control device further comprises a touch screen 10, and the touch screen 10 is connected with the control module (the controller 9). Referring to fig. 2, the ultrasonic sensor 7 transmits the acquired signal to the signal conditioning circuit, converts the signal into a 4-20mA signal, transmits the 4-20mA signal to the controller 9 for calculation, obtains the volume v of the oil in the oil separator 4, controls the oil return, and transmits the data to the touch screen 10 for display through an RS485 signal for the user to check.
A heat pump system comprises a compressor 1, an oil separator 4 and a control device for controlling return oil of refrigeration oil of the compressor, wherein the compressor 1 and the oil separator 4 are provided with the control device. The control device includes: the content detection module is used for detecting the content of the refrigeration oil in the oil separator 4; and the control module is used for judging that when the content of the refrigeration oil in the oil separator 4 is higher than a preset value, controlling the refrigeration oil in the oil separator 4 to be conveyed to the compressor 1. Referring to fig. 1, it is illustrated that the heat pump system further includes a condenser 2, an evaporator 3, an electronic expansion valve 5, a gas-liquid separator 6, a fan 12, and the like.
The content detection module comprises a distance detection device which is used for measuring the distance (height) h from the frozen oil in the oil separator 4 to the distance detection device, the control module is a controller 9, and the control module can calculate the content v of the frozen oil in the oil separator 4 according to the detected height h; where v is s (H-H), s is the bottom area of the oil separator 4, and H is the distance from the detection device to the bottom surface of the oil separator 4. Preferably, the distance detection means is an ultrasonic sensor 7. An ultrasonic sensor 7 is added on the top of the oil separator 4, the ultrasonic sensor emits sound waves, the time t from emission to reception is calculated, the speed v of the sound waves propagating in the air is known, and the distance h can be calculated to be vt/2.
The control device further comprises a temperature detection module for detecting the temperature of the refrigeration oil in the compressor, the temperature detection module is connected with the control module, the temperature detection module is a temperature sensor 8, the temperature sensor 8 is arranged in the bottom of the compressor and used for collecting the temperature T, and signals are transmitted to the controller 9 through signal lines to be processed.
An air conditioner comprising:
one or more memories having executable programs stored thereon;
one or more processors configured to execute the executable programs in the memory to implement the steps of the methods provided by the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (11)

1. The oil return control method of the compressor is characterized by comprising the following steps:
detecting the content of oil in an oil separator (4) connected with a compressor (1);
and if the oil content in the oil separator (4) reaches a set content value, controlling to convey the oil in the oil separator (4) to the compressor (1).
2. Compressor oil return control method according to claim 1, characterized in that when it is detected that the volume v of oil in the oil separator (4) satisfies v>v2At that time, the system enters a forced oil return mode, where v2Is a preset value in the system.
3. Compressor oil return control method according to claim 2, characterized in that when it is detected that the volume v of oil in the oil separator (4) satisfies v<v1When the system is in the oil return-free mode, the system enters the oil return-free mode; it is composed ofIn, v1Is a default value in the system, and v2>v1。
4. Compressor oil return control method according to claim 3, characterized in that when it is detected that the volume v of oil in the oil separator (4) satisfies v2<v<v1When the system enters the optional mode; the optional modes are explained as follows: the user can select the system to return oil or not, and the system defaults to return oil or not return oil.
5. The compressor oil return control method according to claim 1, wherein the content of oil in the oil separator (4) is detected as follows: detecting the distance h from the oil in the oil separator (4) to a detection device, and calculating the oil content v in the oil separator (4) according to the detected distance h; wherein, v is s (H-H), s is the bottom area of the oil separator (4), and H is the distance value from the distance detection device to the bottom of the oil separator (4).
6. The compressor oil return control method according to claim 5, wherein the distance detection means is an ultrasonic sensor (7) and is disposed inside the oil separator (4) and on top of the oil separator (4).
7. The compressor oil return control method according to any one of claims 1-6, characterized in that the temperature of the oil in the compressor (1) is detected, and the temperature of the oil is prevented from falling below a set temperature value by activating a heating device on the compressor (1).
8. Compressor oil return control method according to claim 6, characterized in that when the temperature T of the oil in the compressor (1) is less than a preset temperature value T1When the compressor is started, the heating device is controlled to be started to heat the oil in the compressor (1); if it is detected that the temperature T of the oil in the compressor (1) satisfies T1<T<T2While controlling the heatingThe device is turned off.
9. A control device for controlling oil return of a compressor, the control device comprising:
the content detection module is used for detecting the content of the oil in the oil separator (4);
and the control module is used for controlling the oil in the oil separator (4) to be conveyed to the compressor (1) when the oil content in the oil separator (4) is judged to be higher than a preset value.
10. The control device according to claim 9, characterized by further comprising:
the temperature detection module is used for detecting the temperature of the oil in the compressor (1); when the oil temperature of the oil in the compressor (1) is lower than a preset temperature value, the control module can control the heating device on the compressor (1) to start so as to heat the oil in the compressor (1).
11. An air conditioner, 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 1-8.
CN202111581172.9A 2021-12-22 2021-12-22 Compressor oil return control method and device and air conditioner Pending CN114151992A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115164300A (en) * 2022-06-20 2022-10-11 青岛海尔空调电子有限公司 Method and device for controlling oil return of air conditioner, air conditioner and storage medium
CN117490184A (en) * 2023-12-29 2024-02-02 珠海格力电器股份有限公司 Air conditioning unit oil return control method and air conditioning unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115164300A (en) * 2022-06-20 2022-10-11 青岛海尔空调电子有限公司 Method and device for controlling oil return of air conditioner, air conditioner and storage medium
CN117490184A (en) * 2023-12-29 2024-02-02 珠海格力电器股份有限公司 Air conditioning unit oil return control method and air conditioning unit
CN117490184B (en) * 2023-12-29 2024-04-05 珠海格力电器股份有限公司 Air conditioning unit oil return control method and air conditioning unit

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