CN109373635B - Air conditioner oil return control method and device and air conditioner - Google Patents

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

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Publication number
CN109373635B
CN109373635B CN201811269572.4A CN201811269572A CN109373635B CN 109373635 B CN109373635 B CN 109373635B CN 201811269572 A CN201811269572 A CN 201811269572A CN 109373635 B CN109373635 B CN 109373635B
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oil
oil return
air conditioner
temperature
compressor
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CN109373635A (en
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章秋平
黄春
刘合心
李兆东
任小辉
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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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
    • 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
    • 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

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  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner oil return control method, an air conditioner oil return control device and an air conditioner, wherein the air conditioner oil return control method comprises the steps of opening an electromagnetic valve to return oil when the oil discharge amount in an oil separator reaches a preset value; acquiring the temperature of the oil return capillary after oil return; and when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition, closing the electromagnetic valve to stop oil return. The oil quantity in the oil separator is detected and converted, the electromagnetic valve is opened to return oil through the oil return capillary tube when the oil quantity in the oil separator reaches a threshold value, the temperature after oil return of the oil return capillary tube is monitored, the actual oil return temperature is compared with the theoretical oil return temperature, the refrigerant can be effectively judged to pass through the oil return capillary tube, the electromagnetic valve is closed when the refrigerant passes through the oil return capillary tube, the phenomenon that the refrigerant passes through the oil return capillary tube and bypasses a compressor to do ineffective work is avoided, the operation efficiency of the air conditioner unit is improved, and the energy consumption is reduced.

Description

Air conditioner oil return control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner oil return control method and device and an air conditioner.
Background
With the continuous progress of economy, the application of the air conditioner is more and more extensive, and the air conditioner can bring comfortable experience to users by adjusting the indoor environment temperature, so that the air conditioner becomes one of the most common household appliances.
In order to protect the reliability of the compressor, an inverter air conditioning system is generally provided with an oil separator and an oil return capillary tube. When the compressor is used, the oil return capillary tube is kept in a normally open state, so that the refrigerant can return to the compressor through the oil return capillary tube in many operation states, performance waste and power consumption are caused, and the operation energy efficiency of the unit is reduced.
Disclosure of Invention
In view of the above, the present invention is directed to an oil return control method and device for an air conditioner, and an air conditioner, so as to solve the above problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, the present invention provides an oil return control method for an air conditioner, where the oil return control method is applied to an air conditioner, the air conditioner includes a compressor, an oil separator, an electromagnetic valve, and an oil return capillary tube, the oil return capillary tube is communicated with the oil separator through the electromagnetic valve, and the oil return control method for the air conditioner includes:
when the oil discharge amount in the oil separator reaches a preset value, opening an electromagnetic valve for oil return;
acquiring the temperature of the oil return capillary after oil return;
and when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition, closing the electromagnetic valve to stop oil return.
Further, before the step of opening the electromagnetic valve for oil return when the oil discharge amount in the oil separator reaches a preset value, the method comprises the following steps:
according to the oil discharge rate of the compressor, the operating frequency of the compressor and the continuous operating time of the compressor, L1＝a*A*(f1*t1+f2*t2+…fn*tn) Calculating out L of oil discharge of compressor1Wherein, L1Is the external oil discharge of the compressor, a is the overall efficiency coefficient, A is the oil discharge rate of the compressor, fnIndicates the operating frequency, t, of the compressornThe compressor is operated at a frequency fnThe time of operation.
Further, the method further comprises:
acquiring the operation high pressure and the exhaust temperature of an air conditioner external unit;
according to the fact thatThe length of the oil capillary tube, the operation high pressure of an air conditioner external unit and the exhaust temperature are according to the following formula: t isoil'＝C1*X+C2*Y+C3*Z+C4Calculating theoretical oil return temperature Toil', wherein X is the exhaust temperature of the air conditioner external unit, Y is the operation high pressure of the air conditioner external unit, Z is the length of the oil return capillary tube, C1、C2、C3And C4Is a constant coefficient preset according to the heat transfer characteristics of the refrigerant.
Further, the step of opening the electromagnetic valve for oil return when the oil discharge amount in the oil separator reaches a preset value specifically comprises the step of calculating the external oil discharge amount L of the compressor1And when the pressure is higher than L, the electromagnetic valve is opened for oil return, wherein L is an oil discharge threshold value set according to the reliability of the compressor.
Further, the step of closing the electromagnetic valve to stop oil return when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition includes:
when the temperature T after oil returnoilThe theoretical oil return temperature obtained by calculation meets Toil'：
Figure BDA0001845695250000031
When the refrigerant flows out, the electromagnetic valve is closed, oil return is stopped to prevent the refrigerant from flowing out through the oil return capillary tube,
Figure BDA0001845695250000032
for the parameters set according to the separation efficiency of the oil separator,
Figure BDA0001845695250000033
in a second aspect, the present invention provides an oil return control device for an air conditioner, comprising:
the temperature acquisition unit is used for acquiring the temperature of the oil return capillary after oil return;
the starting oil return unit is used for opening the electromagnetic valve to return oil when the oil discharge amount in the oil separator reaches a preset value;
and the oil return stopping unit is used for closing the electromagnetic valve to stop oil return when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition.
Further, the oil return control device of the air conditioner comprises an oil discharge amount calculation unit which is used for calculating the oil discharge amount according to the oil discharge rate of the compressor, the running frequency of the compressor and the continuous running time of the compressor and according to the equation L1＝a*A*(f1*t1+f2*t2+…fn*tn) Calculating out L of oil discharge of compressor1Wherein, L1Is the external oil discharge of the compressor, a is the comprehensive efficiency coefficient, fnIndicates the operating frequency, t, of the compressornThe compressor is operated at a frequency fnThe time of operation.
Further, the air conditioner oil return control device comprises a temperature calculation unit, wherein the temperature calculation unit is used for calculating the temperature of the air conditioner according to the length of the oil return capillary tube, the operation high pressure of an air conditioner external unit and the exhaust temperature according to the following formula: t isoil'＝C1*X+C2*Y+C3*Z+C4Calculating theoretical oil return temperature Toil', wherein X is the exhaust temperature of the air conditioner external unit, Y is the operation high pressure of the air conditioner external unit, Z is the length of the oil return capillary tube, C1、C2、C3And C4Is a constant coefficient preset according to the heat transfer characteristics of the refrigerant.
Further, the starting oil return unit is used for calculating the external oil discharge amount L of the compressor when the external oil discharge amount L of the compressor is obtained1When the temperature is more than L, the electromagnetic valve is opened for oil return, wherein L is an oil discharge threshold value set according to the reliability of the compressor, and the oil return stopping unit is used for stopping the oil return when the temperature T is after oil returnoilThe theoretical oil return temperature obtained by calculation meets Toil'：
Figure BDA0001845695250000041
When the oil is returned, the electromagnetic valve is closed, and the oil return is stopped, wherein,
Figure BDA0001845695250000042
is based on oil contentThe separation efficiency of the separator is set as a parameter,
Figure BDA0001845695250000043
in a third aspect, the present invention also provides an air conditioner, comprising:
memory, controller and air conditioner oil return controlling means, air conditioner oil return controlling means install in the memory and include one or more by the software function module that the controller was executed, air conditioner oil return controlling means includes:
the temperature acquisition unit is used for acquiring the temperature of the oil return capillary after oil return;
the starting oil return unit is used for opening the electromagnetic valve to return oil when the oil discharge amount in the oil separator reaches a preset value;
and the oil return stopping unit is used for closing the electromagnetic valve to stop oil return when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition.
Compared with the prior art, the air conditioner oil return control method, the air conditioner oil return control device and the air conditioner have the following advantages:
according to the scheme, the oil quantity in the oil separator is detected and converted, the electromagnetic valve is opened to return oil through the oil return capillary tube when the oil quantity in the oil separator reaches the threshold value, the temperature after oil return of the oil return capillary tube is monitored, the temperature after oil return is compared with the theoretical oil return temperature, the refrigerant can be effectively judged to pass through the oil return capillary tube, the electromagnetic valve is closed when the refrigerant passes through the oil return capillary tube, the phenomenon that the refrigerant passes through the oil return capillary tube to bypass the compressor to do ineffective work is avoided, and therefore the operation energy efficiency of the air conditioner unit is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic block diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart of an oil return control method of an air conditioner according to an embodiment of the present invention.
Fig. 3 is a flowchart of a step of calculating a theoretical oil return temperature according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of functional units of an oil return control device of an air conditioner according to an embodiment of the present invention.
Reference numerals:
1-an air conditioner; 2-a controller; 3-a memory; 4-a compressor; 5-an electromagnetic valve; 6-temperature detection module; 7-air conditioner oil return control device; 8-an oil discharge amount calculation unit; 9-a judgment unit; 10-starting an oil return unit; 11-a temperature acquisition unit; 12-a temperature calculation unit; 13-stop oil return unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
First embodiment
The embodiment of the invention provides an air conditioner 1, which is used for reducing the energy consumption and improving the efficiency while regulating the indoor temperature. Fig. 1 is a functional block diagram of an air conditioner 1 according to an embodiment of the present invention. The air conditioner 1 includes: the device comprises a memory 3, a controller 2, a compressor 4, an electromagnetic valve 5, an oil return capillary tube, an oil separator, a temperature detection module 6 and an air conditioner oil return control device 7. The controller 2 is electrically connected with the memory 3, the temperature detection module 6, the compressor 4 and the electromagnetic valve 5, the oil return capillary tube is communicated with the oil separator through the electromagnetic valve 5, and the air conditioner oil return control device 7 comprises at least one of the oil return capillary tube and the oil separator, wherein the oil return capillary tube can be stored in the memory 3 in a software or firmware (firmware) mode.
The memory 3 may be configured to store software programs and units, such as program instructions/units corresponding to the air conditioner oil return control device 7 and the method in the embodiment of the present invention, and the controller 2 executes various functional applications and data processing by running the software programs and units of the air conditioner oil return control device 7 and the method stored in the memory 3, such as the air conditioner oil return control method provided in the embodiment of the present invention. The Memory 3 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.
The controller 2 may be an integrated circuit chip having signal processing capabilities. The controller 2 may be a general-purpose processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. The general purpose processor may be a microprocessor, the controller 2 may also be any conventional processor or the like.
The temperature detection module 6 is configured to detect temperatures of various components of the air conditioner 1, including a temperature of the oil return capillary tube, an exhaust temperature of an air conditioner external unit, and the like, and transmit the detected temperature of the oil return capillary tube to the controller 2.
In a preferred embodiment, the temperature detection module 6 comprises a plurality of temperature sensors.
It will be appreciated that the configuration shown in fig. 1 is merely illustrative and that the air conditioner 1 may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
Second embodiment
The embodiment provides an oil return control method of an air conditioner, which is used for controlling oil return of an oil separator and preventing a refrigerant from returning to a compressor 4 through an oil return capillary tube, so that performance waste and power consumption increase are caused. Referring to fig. 2, fig. 2 is a schematic diagram illustrating an oil return control method of an air conditioner according to the present embodiment, where the oil return control method of the air conditioner includes the following steps: S10-S60.
Step S10: the amount of oil discharged to the outside of the compressor 4 is calculated.
The compressor 4 requires compressor oil to lubricate its various components during operation, and during system operation, the compressor oil is discharged out of the compressor 4 along with the refrigerant (refrigerant), for example, to an oil separator. The amount of oil discharged to the outside of the compressor 4 is calculated based on the oil discharge rate of the compressor 4, the operating frequency of the compressor 4, and the continuous operating time of the compressor 4.
Specifically, when the compressor 4 operates at different frequencies, the power of the external oil discharge is also different, and therefore, the oil discharge amount is calculated according to the operation period of the compressor 4 at different frequencies.
For example, according to the equation L1＝a*A*(f1*t1+f2*t2+…fn*tn) Calculating the external oil discharge of the compressor 4, wherein L1Is the amount of oil discharged to the outside of the compressor 4, a is the overall efficiency coefficient of the compressor 4, A is the oil discharge rate of the compressor 4, f1～fnIndicates the operating frequency, t, of the compressor 41～tnRefers to the operating time of the compressor 4, where n is an integer greater than or equal to 1. t is tnMeans that the compressor 4 is operated at a frequency fnAccording to different operating frequencies of the compressor 4 and the operating time under different frequencies, the external oil discharge L of the compressor 4 is calculated according to the oil discharge rate of the compressor 4 and the comprehensive efficiency coefficient1In the present embodiment, the compressor oil discharged from the compressor 4 enters the oil separator, and the external oil discharge amount L of the compressor 4 is calculated1I.e. calculating the amount of oil discharged L in the oil separator1。
Step S20: and judging whether the oil discharge amount in the oil separator reaches a preset oil discharge threshold value.
In this embodiment, a drain threshold L is preset, where the drain threshold L is set based on the reliability of the compressor 4 when the oil drain amount L in the oil separator is equal to1When the oil discharge threshold value L is not reached, the compressor oil in the compressor 4 is enough to ensure the normal operation of the compressor 4, the reliability of the compressor 4 of the air conditioner 1 is ensured, no additional operation is needed, the current state is maintained, and the normal operation of the air conditioner 1 is kept, when the oil discharge amount L in the oil separator is reached1When the oil discharge threshold L is reached, the reliability of the compressor 4 of the air conditioner 1 is not guaranteed, and at this time, oil return is required, and step S30 is executed.
Step S30: and opening the electromagnetic valve 5 for oil return.
Oil discharge L in oil separator1When reaching the oil discharge threshold L, controlling the solenoid valve 5 to open for oil return, the solenoid valve 5 is arranged between the oil return capillary tube and the oil separator, and when the oil discharge amount L in the oil separator is reached1When reaching the oil discharge threshold value L, the electromagnetic valve 5 is opened to lead the oil return capillary tube and the oil content to be separatedThe separator is communicated, and oil in the oil separator circulates into the compressor 4 again through the oil return capillary tube, so that the normal and stable operation of the compressor 4 is guaranteed.
Step S40: and acquiring the temperature of the oil return capillary after oil return.
Because the compressor oil can flow with the refrigerant, in the process of opening the electromagnetic valve 5 and returning oil to the oil capillary tube for oil return, in order to prevent the refrigerant from entering the compressor 4 again through the oil return capillary tube, the temperature of the oil return capillary tube needs to be monitored. In this embodiment, the oil return capillary is provided with a temperature sensor for detecting and acquiring the temperature T of the oil return capillary after oil returnoilAnd the temperature T after oil returnoilSending the temperature to the controller 2, and the controller 2 controlling the temperature T according to the oil returnoilAnd monitoring the oil return process of the oil return capillary. The temperature after oil return refers to the real-time temperature of the oil return capillary after the electromagnetic valve is opened for oil return, in this embodiment, the temperature after oil return is obtained at preset time intervals, and the preset time intervals are set according to the capacity of the oil separator, so as to ensure the timeliness and the accuracy of state monitoring of the oil return capillary.
Step S50: judging the temperature T after oil returnoilAnd the preset theoretical oil return temperature Toil' whether a preset condition is satisfied.
In the oil return process of the oil separator, the compressor oil discharged by the compressor 4 is accumulated at the bottom of the oil separator, the content of refrigerant (refrigerant) in the oil is low, the compressor oil returns to the compressor 4 through the oil return capillary tube, along with the reduction of the oil amount in the oil separator, the content of the refrigerant in the oil returned to the compressor 4 through the oil return capillary tube is gradually increased, the temperature is reduced due to the pressure reduction throttling effect generated when the refrigerant passes through the oil return capillary tube, and the effect cannot be generated when the compressor oil discharged by the compressor 4 passes through. Therefore, the oil return temperature T of the oil return capillary tube is detectedoilAnd judging the temperature T after oil returnoilAnd the preset theoretical oil return temperature Toil' whether a preset condition is satisfied. When the set conditions are met, judging that the oil storage and return in the oil separator are finished, executing step S60, and stopping oil return; if notIf the preset condition is met, the oil storage in the oil separator is judged to be not finished, and the opening state of the electromagnetic valve 5 is kept at the moment, and oil return is continued.
Because the refrigerant can produce the pressure reduction throttling effect when passing through the oil return capillary, the temperature of oil return capillary can reduce, and compressor oil that compressor 4 discharged can not produce this kind of effect when passing through the oil return capillary, and this embodiment is judged whether to accomplish the oil return through the actual temperature of contrast oil return capillary. Before the judgment in step S50, the method for controlling oil return of air conditioner further includes calculating theoretical oil return temperature ToilPlease refer to fig. 3, which includes steps S41 to S42.
Step S41: and acquiring the operation high pressure and the exhaust temperature of the air conditioner external unit.
Generally, the operation state of the air conditioner 1 includes high pressure, low pressure, static pressure, and the like. Wherein the low pressure is between 0.4-0.6 MPa, the high pressure is between 1.6-2.1 MPa, the static pressure when the machine is shut down is about 1MPa, and the high operating pressure of the air conditioner 1 is obtained according to different performances of the compressor 4. The discharge temperature refers to the temperature of the refrigerant discharged from the compressor 4 of the air conditioner 1, and generally, a temperature sensor is provided at the discharge port of the discharge pipe of the compressor 4 of the air conditioner 1 to detect and obtain the discharge temperature of the air conditioner external unit.
Step S42: calculating theoretical oil return temperature T according to the length of an oil return capillary tube, the operation high pressure of an air conditioner external unit and the exhaust temperatureoil'。
According to the length of the oil return capillary tube, the operation high pressure of an air conditioner external unit and the exhaust temperature, the method comprises the following steps: t isoil'＝C1*X+C2*Y+C3*Z+C4Calculating theoretical oil return temperature Toil' where, X is an exhaust temperature of the air conditioner external unit, Y is an operation high pressure of the air conditioner external unit, Z is a length of the oil return capillary tube, the length of the oil return capillary tube is a characteristic of the oil return capillary tube itself, and has a different length for each oil return capillary tube, C1、C2、C3And C4Is a constant coefficient preset according to the heat transfer characteristics of the refrigerant.
In this embodiment, the predetermined condition is
Figure BDA0001845695250000131
Wherein the content of the first and second substances,
Figure BDA0001845695250000132
for the parameters set according to the separation efficiency of the oil separator,
Figure BDA0001845695250000133
specifically, the characteristics of the oil return capillary tube and the refrigerant may be set.
When the oil return temperature T of the oil return capillary tubeoilAnd theoretical oil return temperature ToilWhen the above conditions are satisfied, the oil return is completed, and the temperature of the oil return capillary is lowered due to the refrigerant passing through the oil return capillary, and at this time, the oil return of the oil stored in the oil separator is completed, step S60 is executed to stop the oil return.
Step S60: the electromagnetic valve 5 is closed to stop oil return.
When the oil return temperature T of the oil return capillary tubeoilAnd theoretical oil return temperature Toil' satisfy
Figure BDA0001845695250000134
When the oil return is finished, the controller 2 controls the electromagnetic valve 5 to close and stop the oil return after the oil storage and the oil return in the oil separator are finished, so that the situation that the refrigerant returns into the compressor 4, the performance of the air conditioner 1 is wasted, the power consumption is increased, and the operation energy efficiency is reduced is prevented.
Third embodiment
Referring to fig. 4, fig. 4 is a schematic diagram of an oil return control device 7 of an air conditioner according to a preferred embodiment of the present invention. It should be noted that the basic principle and the technical effects of the air conditioner oil return control device 7 provided in this embodiment are substantially the same as those of the air conditioner oil return control method provided in the second embodiment, and for the sake of brief description, no part of this embodiment is mentioned, and reference may be made to the corresponding contents in the above embodiments.
The air conditioner oil return control device 7 comprises an oil discharge amount calculation unit 8, a judgment unit 9, a start oil return unit 10, a temperature acquisition unit 11, a temperature calculation unit 12 and a stop oil return unit 13.
Wherein the oil discharge amount calculation unit 8 is used for calculating the oil discharge amount according to the oil discharge rate of the compressor 4, the operation frequency of the compressor 4 and the continuous operation time of the compressor 4 at different operation frequencies according to the equation L1＝a*A*(f1*t1+f2*t2+…fn*tn) The external oil discharge amount L of the compressor 4 is calculated1Wherein, L1Is the amount of oil discharged to the outside of the compressor 4, a is the overall efficiency coefficient, A is the oil discharge rate of the compressor 4, fnIndicates the operating frequency, t, of the compressor 4nThe compressor 4 is operated at a frequency fnThe time of operation.
It is to be understood that, in a preferred embodiment, the oil discharge amount calculation unit 8 may be configured to perform step S10.
And the judging unit 9 is used for judging whether the oil discharge amount in the oil separator reaches a preset oil discharge threshold value.
It is to be understood that in a preferred embodiment, the judging unit 9 may be configured to execute step S20.
And starting an oil return unit 10 for opening the electromagnetic valve 5 for oil return when the oil discharge amount in the oil separator reaches a preset oil discharge threshold value.
It is understood that, in a preferred embodiment, the oil return starting unit 10 may be used to execute step S30.
And the temperature obtaining unit 11 is used for obtaining the temperature of the oil return capillary after oil return.
It is to be understood that, in a preferred embodiment, the temperature obtaining unit 11 may be configured to perform step S40.
A temperature calculating unit 12, configured to calculate a temperature of the air conditioner external unit according to the length of the oil return capillary tube, the operation high pressure of the air conditioner external unit, and the exhaust temperature according to the following equation: t isoil'＝C1*X+C2*Y+C3*Z+C4Calculating theoretical oil return temperature Toil', wherein X is the exhaust temperature of the air conditioner external unit, Y is the operation high pressure of the air conditioner external unit, Z is the length of the oil return capillary tube, C1、C2、C3And C4Is a constant coefficient preset according to the heat transfer characteristics of the refrigerant.
It is understood that, in a preferred embodiment, the temperature calculation unit 12 may be used to perform the steps S41-S42.
The judging unit 9 is also used for judging the temperature T after oil returnoilAnd the preset theoretical oil return temperature Toil' whether a preset condition is satisfied.
It is to be understood that, in a preferred embodiment, the judging unit 9 is further configured to execute step S50.
A stop oil return unit 13 for stopping the oil return capillary tube when the oil return temperature T is lower than the oil return temperature ToilAnd the preset theoretical oil return temperature ToilWhen the preset condition is met, the electromagnetic valve 5 is controlled to be closed, and oil return is stopped. In this embodiment, the oil return temperature T of the oil return capillary tubeoilAnd theoretical oil return temperature Toil' satisfy
Figure BDA0001845695250000151
When the oil return is finished, the controller 2 controls the electromagnetic valve 5 to close and stop the oil return after the oil storage and the oil return in the oil separator are finished, so that the situation that the refrigerant returns into the compressor 4, the performance of the air conditioner 1 is wasted, the power consumption is increased, and the operation energy efficiency is reduced is prevented.
In summary, the invention provides an air conditioner oil return control method, an air conditioner oil return control device and an air conditioner, wherein the air conditioner oil return control method comprises the steps of opening an electromagnetic valve to return oil when the oil discharge amount in an oil separator reaches a preset value; acquiring the temperature of the oil return capillary after oil return; and when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition, closing the electromagnetic valve to stop oil return. The oil quantity in the oil separator is detected and converted, the electromagnetic valve is opened to return oil through the oil return capillary tube when the oil quantity in the oil separator reaches a threshold value, the temperature after oil return of the oil return capillary tube is monitored, the temperature after oil return is compared with the theoretical oil return temperature, the refrigerant can be effectively judged to pass through the oil return capillary tube, the electromagnetic valve is closed when the refrigerant passes through the oil return capillary tube, the phenomenon that the refrigerant passes through the oil return capillary tube and bypasses a compressor to do ineffective work is avoided, the operation efficiency of the air conditioner unit is improved, and the energy consumption is reduced.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The air conditioner oil return control method is characterized by being applied to an air conditioner (1), wherein the air conditioner (1) comprises a compressor (4), an oil separator, an electromagnetic valve (5) and an oil return capillary tube, the oil return capillary tube is communicated with the oil separator through the electromagnetic valve (5), and the air conditioner oil return control method comprises the following steps:
when the oil discharge amount in the oil separator reaches a preset value, an electromagnetic valve (5) is opened to return oil;
acquiring the temperature of the oil return capillary after oil return, wherein the temperature after oil return refers to the actual temperature of the oil return capillary after oil return is started;
when the temperature after oil return and the preset theoretical oil return temperature meet the preset conditions, closing the electromagnetic valve (5) to stop oil return;
wherein, the step of setting the theoretical oil return temperature comprises:
acquiring the operation high pressure and the exhaust temperature of an air conditioner external unit;
according to the length of the oil return capillary tube, the operation high pressure of an air conditioner external unit and the exhaust temperature, the method comprises the following steps: t isoil'＝C1*X+C2*Y+C3*Z+C4Calculating theoretical oil return temperature Toil', wherein X is the exhaust temperature of the air conditioner external unit, Y is the operation high pressure of the air conditioner external unit, Z is the length of the oil return capillary tube, C1、C2、C3And C4A constant system preset according to the heat transfer characteristics of the refrigerantAnd (4) counting.
2. The oil return control method of an air conditioner according to claim 1, wherein before the step of opening the solenoid valve (5) for oil return when the amount of oil discharged in the oil separator reaches a preset value, the method comprises:
according to the oil discharge rate of the compressor (4), the operation frequency of the compressor (4) and the continuous operation time of the compressor (4), according to the equation L1＝a*A*(f1*t1+f2*t2+…fn*tn) Calculating the external oil discharge L of the compressor (4)1Wherein, L1Is the external oil discharge of the compressor (4), a is the overall efficiency coefficient, A is the oil discharge rate of the compressor (4), fnIndicates the operating frequency, t, of the compressor (4)nThe compressor (4) is operated at a frequency fnThe time of operation.
3. The air conditioner oil return control method according to claim 2, wherein the step of opening the electromagnetic valve (5) for oil return when the oil discharge amount in the oil separator reaches a preset value specifically comprises the step of calculating an external oil discharge amount L of the compressor (4)1And when the pressure is higher than L, the electromagnetic valve (5) is opened for oil return, wherein L is an oil discharge threshold value set according to the reliability of the compressor (4).
4. The oil return control method of the air conditioner according to claim 1, wherein the step of closing the electromagnetic valve (5) to stop oil return when the temperature after oil return and the preset theoretical oil return temperature meet a preset condition comprises:
when the temperature T after oil returnoilAnd the calculated theoretical oil return temperature Toil' satisfies:
Figure FDA0002506650780000021
when the refrigerant flows out, the electromagnetic valve (5) is closed, oil return is stopped to prevent the refrigerant from flowing out through the oil return capillary tube,
Figure FDA0002506650780000022
for the parameters set according to the separation efficiency of the oil separator,
Figure FDA0002506650780000023
5. an air conditioner oil return control device, characterized in that, air conditioner oil return control device (7) includes:
the temperature acquisition unit (11) is used for acquiring the temperature of the oil return capillary of the air conditioner after oil return;
the starting oil return unit (10) is used for opening the electromagnetic valve (5) to return oil when the oil discharge amount in the oil separator reaches a preset value;
a temperature calculation unit (12), wherein the temperature calculation unit (12) is used for calculating the temperature of the air conditioner outdoor unit according to the length of the oil return capillary tube, the operation high pressure of the air conditioner outdoor unit and the exhaust temperature according to the following formula: t isoil'＝C1*X+C2*Y+C3*Z+C4Calculating theoretical oil return temperature Toil', wherein X is the exhaust temperature of the air conditioner external unit, Y is the operation high pressure of the air conditioner external unit, Z is the length of the oil return capillary tube, C1、C2、C3And C4A constant coefficient preset according to the heat transfer characteristics of the refrigerant;
and the oil return stopping unit (13) is used for closing the electromagnetic valve (5) to stop oil return when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition.
6. The air conditioner oil return control device according to claim 5, wherein the air conditioner oil return control device (7) comprises an oil discharge amount calculation unit (8) for calculating an oil discharge amount according to an equation L based on an oil discharge rate of the compressor (4), an operation frequency of the compressor (4), and a continuous operation time of the compressor (4)1＝a*A*(f1*t1+f2*t2+…fn*tn) Calculating the external oil discharge L of the compressor (4)1Wherein, L1Is the external oil discharge of the compressor (4), a is the comprehensive efficiency coefficient, A isOil discharge rate f of compressor 4nIndicates the operating frequency, t, of the compressor (4)nThe compressor (4) is operated at a frequency fnThe time of operation.
7. Air conditioner oil return control device according to claim 5, characterized in that the start oil return unit (10) is configured to calculate the external oil discharge amount L of the compressor (4)1When the temperature is higher than L, the electromagnetic valve (5) is opened for oil return, wherein L is an oil discharge threshold value set according to the reliability of the compressor (4), and the oil return stopping unit (13) is used for stopping oil return when the temperature T is after oil returnoilAnd the calculated theoretical oil return temperature Toil' satisfies:
Figure FDA0002506650780000041
when the oil is returned, the electromagnetic valve (5) is closed, and the oil return is stopped, wherein,
Figure FDA0002506650780000042
for the parameters set according to the separation efficiency of the oil separator,
Figure FDA0002506650780000043
8. an air conditioner, characterized in that the air conditioner (1) comprises: memory (3), controller (2) and air conditioner oil return controlling means (7), air conditioner oil return controlling means (7) install in memory (3) and include one or more by the software function module that controller (2) were carried out, air conditioner oil return controlling means (7) include:
the temperature acquisition unit (11) is used for acquiring the temperature of the oil return capillary of the air conditioner after oil return;
the starting oil return unit (10) is used for opening the electromagnetic valve (5) to return oil when the oil discharge amount in the oil separator reaches a preset value;
a temperature calculation unit (12), wherein the temperature calculation unit (12) is used for calculating the temperature of the air conditioner outdoor unit according to the length of the oil return capillary tube, the operation high pressure of the air conditioner outdoor unit and the exhaust temperature according to the following formula: t isoil'＝C1*X+C2*Y+C3*Z+C4Calculating theoretical oil return temperature Toil', wherein X is the exhaust temperature of the air conditioner external unit, Y is the operation high pressure of the air conditioner external unit, Z is the length of the oil return capillary tube, C1、C2、C3And C4A constant coefficient preset according to the heat transfer characteristics of the refrigerant;
and the oil return stopping unit (13) is used for closing the electromagnetic valve (5) to stop oil return when the temperature after oil return and the preset theoretical oil return temperature meet the preset condition.
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