CN109813009A - Air-conditioning system and its method for controlling oil return - Google Patents
Air-conditioning system and its method for controlling oil return Download PDFInfo
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- CN109813009A CN109813009A CN201811565333.3A CN201811565333A CN109813009A CN 109813009 A CN109813009 A CN 109813009A CN 201811565333 A CN201811565333 A CN 201811565333A CN 109813009 A CN109813009 A CN 109813009A
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Abstract
The invention discloses air-conditioning system and its method for controlling oil return, air-conditioning system includes: the oil eliminator for including: compressor, the injector that refrigeration oil injection is sent back to compressor, connect compressor exhaust outlet, the oil outlet of the main leading-in end connection oil eliminator of injector.Oil return switch valve is in series between the main leading-in end of injector and the oil outlet of oil eliminator, oil return switch valve is connected with control device, and control device controls oil return switch valve according to the operating status of compressor.Good oil return, stable and reliable operation are kept when the present invention runs unit.
Description
Technical field
The present invention relates to air-conditioning technical fields, especially air-conditioning system and its method for controlling oil return.
Background technique
Full-liquid type case tube heat exchanger is many cold because its refrigerating capacity is big, the high attention by more and more producers of Energy Efficiency Ratio
Water dispenser group is using full-liquid type package as heat exchanger, especially cooling by wind.But because full-liquid type case tube heat exchanger
Tube side shell side of leaking water walks refrigerant, and refrigerant occupied space inside package is big, while coolant quantity is more, and compressor oil is easy to follow cold
Matchmaker's transfer accumulates in package bottom, causes system oil return amount few, compressor is easy to appear oil starvation, seriously affects compressor reliability
And performance, will finally compressor be made to damage.
Existing numerous patents, which are disclosed, in the prior art sends oil back to compressor, such as Publication No. using injection oil return technology
The patent of invention of CN101135505A, the leading-in end of injector are arranged by radiator connect compressor exhaust outlet by compressor
Gaseous coolant out drives oil return, then such as notification number is the utility model patent of CN201811490U, compresses Hu exhaust outlet
Oil eliminator is connected, the leading-in end of injector is connected on the gas outlet of oil eliminator, drives oil return by gaseous coolant.This two
Kind circuit directly sends the part refrigerant that compressor is discharged back to compressor, causes the waste for recycling cooling capacity in unit, reduces
Unit capacity.
Therefore, how to design a kind of more effectively reliable air-conditioning system of oil return is industry technical problem urgently to be resolved.
Summary of the invention
The defect of unit capacity is reduced in order to solve oil return in the prior art, the present invention proposes air-conditioning system and its oil return control
Method processed.
The technical solution adopted by the present invention is that design air-conditioning system includes: includes: compressor, sends refrigeration oil injection back to
The oil eliminator of the injector of compressor, connect compressor exhaust outlet, the main leading-in end connection oil eliminator of injector it is fuel-displaced
Mouthful.
Preferably, air-conditioning system further include: bottom connects the heat exchanger of the secondary leading-in end of injector, and injector is by heat exchanger
The refrigeration oil of interior accumulation sends compressor back to.
Preferably, heat exchanger is full-liquid type case tube heat exchanger.
Preferably, gas-liquid separator is connected between the output end of injector and the air entry of compressor.
Preferably, it is in series with oil return switch valve between the main leading-in end of injector and the oil outlet of oil eliminator, oil return is opened
Injector injection oil return when valve is opened is closed, injector stops oil return when oil return switch valve is closed.
Preferably, oil return switch valve is connected with control device, and control device controls oil return according to the operating status of compressor
Switch valve.
Preferably, control device includes: the sensor module for detecting compressor behavior, connect with sensor module
Controller, controller is according to the detection signal-off of sensor module or opens oil return switch valve.
Preferably, sensor module includes: the temperature sensing package of the suction temperature of detection compressor, the pressure of inspiration(Pi) for detecting compressor
The pressure sensor of power.
Preferably, sensor module includes: the liquid level detection device for detecting the practical oil level of the compressor.
Preferably, liquid level detection device uses oil level alarm.
The invention also provides the method for controlling oil return of above-mentioned air-conditioning system, comprising: detect compressor suction temperature and
Pressure of inspiration(Pi) calculates degree of superheat T and/or degree of superheat change rate △ T and controls oil return switch valve.
As T >=a, oil return switch valve is opened；And/or as a > T >=c, calculates △ T and oil return switch is controlled according to △ T
Valve；And/or as T < c, oil return switch valve is closed.Wherein, a is default first degree of superheat, and c is the default third degree of superheat, a >
c。
Preferably, the mode of oil return switch valve is controlled according to △ T are as follows: as a > T >=b, △ T is calculated, if when △ T >=A,
Oil return switch valve (11) is closed, if when △ T < A, oil return switch valve is opened；And/or as b > T >=c, △ T is calculated, if △ T >=
When B, oil return switch valve is closed, if when △ T < B, oil return switch valve is opened.Wherein, b is default second degree of superheat, and A is default the
One degree of superheat change rate, B are default second degree of superheat change rate, a > b > c, A > B.
Preferably, the corresponding saturation temperature t2 of degree of superheat T=suction temperature t1- pressure of inspiration(Pi).
Preferably, degree of superheat change rate △ T=(second the first degree of superheat T1 of degree of superheat T2-)/2, the controller is calculating
It is spaced preset time after first degree of superheat T1 and calculates second degree of superheat T2.
Preferably, preset time is no more than 2 seconds.
Preferably, method for controlling oil return further include: the practical oil level in detection compressor, when practical oil level is lower than default oil
When position, oil return switch valve is stayed open.
Compared with prior art, the invention has the following advantages that
1, injection oil return process uses high pressure refrigeration oil as injection source, provides injection power without refrigerant, it is easy to solve compressor
The problem of oil starvation, and will not influence unit capacity, oil return is more effectively reliable；
2, compressor is sent back to by gas-liquid separator when oil return, effectively refrigeration oil is avoided to bring liquid refrigerants caused by compressor into
Compressor liquid hazards reduce compressor operation risk；
3, the on-off that oil return is controlled by the degree of superheat avoids excessive oil return operation that compressor band liquid is caused to run, further increases
Compressor operational reliability.
Detailed description of the invention
Below with reference to embodiment and attached drawing, the present invention is described in detail, in which:
Fig. 1 is the connection schematic diagram of air-conditioning system in the present invention；
Fig. 2 is the flow diagram of control method in the present invention.
Specific embodiment
As shown in Figure 1, air-conditioning system proposed by the present invention includes: to include: compressor 1, injector 12 and oil eliminator 2
Deng its bottom position is arranged in the exhaust outlet of the air inlet connect compressor 1 of oil eliminator 2, the oil outlet of oil eliminator 2, injection
Device 12 is equipped with main leading-in end, secondary leading-in end and output end, the oil outlet of main leading-in end connection oil eliminator 2, and refrigeration oil is from injection
The secondary leading-in end of device 12 enters in injector 12, and the oil in injector 12 is sent back in compressor 1 by output end.
Preferably, air-conditioning system further includes full-liquid type case tube heat exchanger 4, and the secondary leading-in end of injector 12 connects full-liquid type shell
Back to compressor 1 is sent the refrigeration oil accumulated in it in the bottom of heat exchange of heat pipe 4, and the secondary leading-in end of injector 12 can also connect other
There is the heat exchanger for accumulating oil in type shell.Oil return process be compressor 1 be discharged high temperature and pressure refrigerant with refrigeration oil into
Enter oil eliminator 2, first separated in oil eliminator 2,2 place side of oil eliminator is the high-pressure side of compressor 1, oil outlet
The refrigeration oil power of discharge is very big, and refrigeration oil will be in full-liquid type case tube heat exchanger 4 by drawing suction effect after entering injector 12
Accumulation oil is drawn onto mixing in injector 12 and sends compressor 1 back to, and injection process uses high pressure refrigeration oil as injection source, without refrigerant
Injection power is provided, therefore system capability will not be reduced.
Further, it is connected with gas-liquid separator 7 between the output end of injector 12 and the air entry of compressor 1, exports
The oily and a small amount of refrigerant at end is introduced into after gas-liquid separator 7 carries out gas-liquid separation and enters back into inside compressor 1, when full-liquid type package
The liquid refrigerants storage of 4 bottom of heat exchanger is larger, and when liquid level is higher than the port height of secondary leading-in end, liquid refrigerants will be introduced from pair
End is sent to output end, and gas-liquid separator 7 can play a role at this time, and liquid refrigerants is effectively avoided to be directly entered inside compressor 1,
Compressor 1 is avoided to run with liquid.In a preferred embodiment, the oil outlet of oil eliminator 2 divides the air entry of two-way and compressor 1 to connect
It connects, is the air entry for returning to compressor 1 by injector 12 and gas-liquid separator 7 all the way, another way is returned by capillary 10
To the air entry of compressor 1.
In a preferred embodiment, air-conditioning system further includes electric expansion valve 5, finned heat exchanger 6 and four-way valve 3 etc., electricity
Sub- expansion valve 5 is connected between full-liquid type case tube heat exchanger 4 and finned heat exchanger 6, and four ports of four-way valve 3 are separately connected
Oil eliminator 2, full-liquid type case tube heat exchanger 4, finned heat exchanger 6 and gas-liquid separator 7.
Further, oil return switch valve is in series between the main leading-in end of injector 12 and the oil outlet of oil eliminator 2
11, oil return switch valve 11 uses solenoid valve, and injector 12 is opened to 1 injection oil return of compressor, oil return when oil return switch valve 11 is opened
Injector 12 when valve 11 is closed is closed to stop to 1 injection oil return of compressor.Oil return switch valve 11 is connected with control device, control device
Oil return switch valve is controlled according to the operating status of compressor 1.Specifically, control device includes: detection 1 operating status of compressor
Sensor module, the controller that is connect with sensor module, controller is according to the detection signal-off of sensor module or beats
Open oil return switch valve 11.
In a preferred embodiment, sensor module includes: the temperature sensing package 9 for detecting the suction temperature t1 of compressor 1, detection pressure
The pressure sensor 8 of the pressure of inspiration(Pi) of contracting machine 1, controller calculate degree of superheat T according to suction temperature t1 and pressure of inspiration(Pi), passed through
Temperature T and/or degree of superheat change rate △ T controls oil return switch valve 11, guarantees the reasonability of oil return control.In order to avoid compressor
The operation of 1 oil starvation is damaged, sensor module further include: the liquid level detection device 13 of the practical oil level of detection compressor 1, control
Device opens oil return switch valve 11, liquid level detection device when liquid level detection device 13 detects that practical oil level is lower than default oil level
Using oil level alarm.
As shown in Fig. 2, the invention also provides the method for controlling oil return of above-mentioned air-conditioning system, comprising: detection compressor 1
Suction temperature t1 and pressure of inspiration(Pi) calculate the degree of superheat, compare the size of degree of superheat T and control oil return switch valve 11.
As degree of superheat T >=default first degree of superheat a, then judges that the degree of superheat is larger, can continue to draw using injector 12
It is emitted back towards oil, control oil return switch valve 11 is opened；As default first degree of superheat a > degree of superheat T >=default third degree of superheat c, meter
Degree of superheat change rate △ T is calculated, and oil return switch valve 11 is controlled according to degree of superheat change rate △ T；When degree of superheat T < presets third mistake
When temperature c, then judge that degree of superheat T is too low, there is band liquid operation risk, oil return switch valve 11 is closed.
Wherein, it should be noted that default first degree of superheat a > presets third degree of superheat c, degree of superheat T=suction temperature
T1- pressure of inspiration(Pi) corresponding saturation temperature t2, the degree of superheat change rate △ T=(second the first degree of superheat T1 of degree of superheat T2-)/2, control
Device processed is spaced preset time after calculating the first degree of superheat T1 and calculates the second degree of superheat T2, and preset time may be configured as 1 second or 2 seconds
Deng, preferably more than 2 seconds, feed back degree of superheat change rate to timely update, oil return control it is more acurrate.
In a preferred embodiment, the mode of the oil return switch valve is controlled according to degree of superheat change rate are as follows: when default first
When degree of superheat a > degree of superheat T >=default second degree of superheat b, degree of superheat change rate △ T is calculated, if degree of superheat change rate △ T >=pre-
If when the first degree of superheat change rate A, then judging that degree of superheat reduction rate is too fast, oil return switch valve 11 is closed, if the degree of superheat changes
When rate △ T < presets the first degree of superheat change rate A, then judges that degree of superheat reduction rate is slower, may continue to injection oil return, oil return
Switch valve 11 is opened；As default second degree of superheat b > degree of superheat T >=default third degree of superheat c, degree of superheat change rate △ is calculated
T, if when degree of superheat change rate △ T >=default second degree of superheat change rate B, judging that degree of superheat reduction rate is too fast, oil return is opened
Close valve 11 close, if degree of superheat change rate △ T < preset the second degree of superheat change rate B, judge the degree of superheat reduce rate compared with
Slowly, it may continue to injection oil return, oil return switch valve 11 is opened.
Wherein, it should be noted that default first degree of superheat a > presets the second degree of superheat b > and presets third degree of superheat c,
Default first degree of superheat change rate A > presets the second degree of superheat change rate B.
More preferably, while real-time detection calculates the degree of superheat, the practical oil level in real-time detection compressor 1 is gone back, reality is worked as
When border oil level is lower than default oil level, no matter at this time degree of superheat what state, opens the 11 injection oil return of oil return switch valve at once, can be according to
It keeps compressor to keep normal oil level according to Safe Levels situation, avoids oil starvation operation damage compressor.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, and structure of the invention can
Be useful in other air-conditioning systems with compressor, heat exchanger and oil eliminator, it is all within present inventive concept made by repair
Change, equivalent replacement and improvement etc., should all be included in the protection scope of the present invention.
Claims (17)
1. a kind of air-conditioning system, comprising: compressor (1), the injector (12) that refrigeration oil injection is sent back to the compressor (1),
Connect the oil eliminator (2) of the compressor (1) exhaust outlet, which is characterized in that the main leading-in end of the injector (12) connects
The oil outlet of the oil eliminator (2).
2. air-conditioning system as described in claim 1, which is characterized in that further include: bottom connects the pair of the injector (12)
The heat exchanger of leading-in end, the injector (12) send the refrigeration oil accumulated in the heat exchanger back to the compressor (1).
3. air-conditioning system as claimed in claim 2, which is characterized in that the heat exchanger is full-liquid type case tube heat exchanger (4).
4. air-conditioning system as described in claim 1, which is characterized in that the output end and the compressor of the injector (12)
(1) gas-liquid separator (7) are connected between air entry.
5. such as the described in any item air-conditioning systems of Claims 1-4, which is characterized in that the main leading-in end of the injector (12)
Oil return switch valve (11) are in series between the oil outlet of the oil eliminator (2)；
The oil return switch valve (11) injector (12) injection oil return when opening, the oil return switch valve (11) close when institute
It states injector (12) and stops oil return.
6. air-conditioning system as claimed in claim 5, which is characterized in that the oil return switch valve (11) is connected with control device,
The control device controls the oil return switch valve (11) according to the operating status of the compressor (1).
7. air-conditioning system as claimed in claim 6, which is characterized in that the control device includes: the detection compressor (1)
The sensor module of operating status, the controller connecting with the sensor module, the controller is according to the sensor group
The detection signal-off of part opens the oil return switch valve (11).
8. air-conditioning system as claimed in claim 7, which is characterized in that the sensor module includes: the detection compressor
(1) temperature sensing package (9) of suction temperature, the detection compressor (1) pressure of inspiration(Pi) pressure sensor (8).
9. air-conditioning system as claimed in claim 7, which is characterized in that the sensor module includes: the detection compressor
(1) liquid level detection device of practical oil level.
10. air-conditioning system as claimed in claim 9, which is characterized in that the liquid level detection device uses oil level alarm
(13).
11. a kind of control method of air-conditioning system as claimed in claim 6 characterized by comprising detect the compressor
(1) suction temperature and pressure of inspiration(Pi) calculate degree of superheat T and/or degree of superheat change rate △ T and control the oil return switch valve.
12. control method as claimed in claim 11, which is characterized in that as T >=a, the oil return switch valve (11) is opened；
And/or as a > T >=c, calculates △ T and the oil return switch valve (11) is controlled according to △ T；
And/or as T < c, the oil return switch valve (11) is closed；
Wherein, a is default first degree of superheat, and c is the default third degree of superheat, a > c.
13. control method as claimed in claim 12, which is characterized in that control the oil return switch valve (11) according to △ T
Mode are as follows:
As a > T >=b, △ T is calculated, if when △ T >=A, the oil return switch valve (11) is closed, if when △ T < A, the oil return
Switch valve (11) is opened；
And/or as b > T >=c, △ T is calculated, if when △ T >=B, the oil return switch valve (11) is closed, if when △ T < B, institute
State oil return switch valve (11) opening；
Wherein, b is default second degree of superheat, and A is default first degree of superheat change rate, and B is default second degree of superheat change rate, a
> b > c, A > B.
14. control method as claimed in claim 11, which is characterized in that the degree of superheat T=suction temperature t1- pressure of inspiration(Pi)
Corresponding saturation temperature t2.
15. control method as claimed in claim 14, which is characterized in that degree of superheat change rate △ T=(second degree of superheat
The first degree of superheat T1 of T2-)/2, the controller is spaced preset time after calculating the first degree of superheat T1 and calculates second overheat
Spend T2.
16. control method as claimed in claim 15, which is characterized in that the preset time is no more than 2 seconds.
17. control method as claimed in claim 11, which is characterized in that further include: detect the reality in the compressor (1)
Oil level, when the practical oil level is lower than default oil level, the oil return switch valve (11) is stayed open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811565333.3A CN109813009B (en) | 2018-12-20 | 2018-12-20 | Air conditioning system and oil return control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811565333.3A CN109813009B (en) | 2018-12-20 | 2018-12-20 | Air conditioning system and oil return control method thereof |
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| CN109813009A true CN109813009A (en) | 2019-05-28 |
| CN109813009B CN109813009B (en) | 2020-04-28 |
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ID=66601791
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| CN201811565333.3A Active CN109813009B (en) | 2018-12-20 | 2018-12-20 | Air conditioning system and oil return control method thereof |
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Cited By (4)
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| CN110274413A (en) * | 2019-06-10 | 2019-09-24 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of compressor assembly and air-conditioning |
| CN110553441A (en) * | 2019-09-19 | 2019-12-10 | 重庆美的通用制冷设备有限公司 | Operation control method and system, readable storage medium, compression and air conditioning system |
| CN114353359A (en) * | 2021-12-20 | 2022-04-15 | 青岛海尔空调电子有限公司 | Air conditioner oil return control method |
| CN115183510A (en) * | 2022-07-18 | 2022-10-14 | 青岛海尔空调电子有限公司 | Air conditioning system, compressor oil return system and control method |
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| CN115183510B (en) * | 2022-07-18 | 2023-11-24 | 青岛海尔空调电子有限公司 | Air conditioning system, compressor oil return system and control method |
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| CN109813009B (en) | 2020-04-28 |
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