CN105758065B - A kind of air-conditioning system method for controlling oil return - Google Patents
A kind of air-conditioning system method for controlling oil return Download PDFInfo
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- CN105758065B CN105758065B CN201610111876.2A CN201610111876A CN105758065B CN 105758065 B CN105758065 B CN 105758065B CN 201610111876 A CN201610111876 A CN 201610111876A CN 105758065 B CN105758065 B CN 105758065B
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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
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- 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
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- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of air-conditioning system method for controlling oil return, comprising: when oil return runs and enters, sets compressor target frequency as oil return frequency f0, it is zero that effective oil return running time T x, which is arranged,；During oil return operation, operations described below is carried out every setting time: detection back pressure Psat, and obtain the corresponding refrigerant saturation temperature Tsat of the back pressure Psat；The refrigerant temperature T in four-way valve and tracheae shut-off valve connecting line is detected, and obtains the absolute value △ T of Tsat Yu T difference；Judge whether to meet △ T≤setting difference and compressor actual frequency f >=setpoint frequency；If so, calculating Tx=Tx+ △ Tx, △ Tx is value added；Whether judge Tx >=the effective oil return runing time of setting；If so, exiting oil return operation.Air-conditioning system method for controlling oil return of the invention, improves oil return efficiency, avoids liquid measure excessive, improves oil return effect, improves system reliability of operation.
Description
Technical field
The invention belongs to air-conditioning technical fields, specifically, being to be related to a kind of air-conditioning system method for controlling oil return.
Background technique
In connected unit, when the operation of system low-load, since compressor operating frequency is low, especially heating is transported
When row, refrigeration oil is easy to accumulate in interior machine, and the oil return control concentrated after the long period is run in low-load.
In existing oil return control, oil return runing time is fixed, poor to the adaptability of different operating conditions, is existed
Oil return time deficiency or too long situation under certain operating conditions.The oil return time is insufficient, and it is bad to be easy to appear oil return effect；The oil return time
It is too long, it is easy to cause back liquid excessive, system reliability is caused to reduce.
Summary of the invention
The present invention provides a kind of air-conditioning system method for controlling oil return, solves oil return runing time deficiency and too long ask
Topic.
It is achieved in order to solve the above technical problems, the present invention adopts the following technical solutions:
A kind of air-conditioning system method for controlling oil return, which comprises
When oil return runs and enters, compressor target frequency is set as oil return frequency f0, effective oil return runing time is set
Tx is zero；
During oil return operation, operations described below is carried out every setting time:
(a) back pressure Psat is detected, and obtains the corresponding refrigerant saturation temperature Tsat of the back pressure Psat；
(b) the refrigerant temperature T in four-way valve and tracheae shut-off valve connecting line is detected, and obtains the exhausted of Tsat and T difference
To value △ T；
(c) judge whether to meet △ T≤setting difference and compressor actual frequency f >=setpoint frequency；
If so, calculating Tx=Tx+ △ Tx, △ Tx is value added；
Whether judge Tx >=the effective oil return runing time of setting；
If so, exiting oil return operation.
Further, according to formulaObtain the corresponding refrigerant saturation temperature of back pressure Psat
Tsat is spent,
Wherein, a1, a2, a3 are refrigerant coefficient.
Further, back pressure Psat is obtained by the low-pressure sensor being mounted on compressor return air pipe,
Refrigerant temperature T is obtained by the temperature sensor being mounted on four-way valve and tracheae shut-off valve connecting line.
Further, the method also includes:
When oil return runs and enters, timing parameter t is set, timing is carried out to entire oil return runing time；
During oil return operation, judge whether timing parameter t is more than or equal to setting oil return runing time；
If so, exiting oil return operation.
Further, the method also includes:
Oil return operation enter before, judge air-conditioning system whether heating operation；
If so, control four-way valve commutation, indoor fan is shut down, into oil return when meeting oil return operation entry condition
Operation；
When exiting oil return operation, control four-way valve commutation, indoor fan starting, air-conditioning system continuation heating operation.
Further, the oil return frequency f0 is the 75%~85% of compressor highest frequency.
Further, for the difference that sets as 4 DEG C~6 DEG C, the setpoint frequency is 0.4f0~0.6f0.
Further, the value added △ Tx is 8f/f0~12f/f0.
Further, described to set effective oil return runing time as 60s~80s, it is described set oil return runing time as
240s~360s.
Preferably, the setting time is 5s~15s.
Compared with prior art, the advantages and positive effects of the present invention are: air-conditioning system method for controlling oil return of the invention,
Using the intersolubility of refrigerant liquid and refrigeration oil, system high-frequency rate is made to return gas carrying liquid operating, pipeline and indoor unit is accumulated cold
Frozen oil is recovered in gas-liquid separator, and controls oil return runing time, avoids oil return runing time too long or too short, improves oil return
Efficiency avoids liquid measure excessive, improves oil return effect, improves system reliability of operation.
After a specific embodiment of the invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Detailed description of the invention
Fig. 1 is the air-conditioning system structure chart of air-conditioning system method for controlling oil return proposed by the invention；
Fig. 2 is the flow chart of one embodiment of air-conditioning system method for controlling oil return proposed by the invention.
Appended drawing reference:
11, indoor unit；12, indoor unit；13, indoor unit；
20, outdoor unit；21, compressor；22, oil eliminator；23, check valve；24, four-way valve；25, outdoor heat exchanger；26,
Main electric expansion valve；27, gas-liquid separator；
S1, high-pressure pressure sensor；S3, low-pressure sensor；T3, temperature sensor；
2J1, tracheae shut-off valve；2J2, liquid pipe shut-off valve.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to drawings and examples,
Invention is further described in detail.
The air-conditioning system method for controlling oil return of the present embodiment is run when meeting oil return operation entry condition into oil return,
When oil return runs and enters, compressor target frequency is set as oil return frequency f0, effective oil return running time T x is reset；It is returning
During oil operation, operations described below is carried out every setting time: obtaining back pressure Psat and corresponding refrigerant saturation temperature
Tsat obtains the refrigerant temperature T in four-way valve and tracheae shut-off valve connecting line, calculates the absolute value △ T of Tsat and T difference,
In △ T≤setting difference and compressor actual frequency f >=setpoint frequency, Tx=Tx+ △ Tx is calculated, is effectively returned in Tx >=setting
Oil return operation is exited when oily runing time.The control method of the present embodiment is avoided by the control to effective oil return runing time
Oil return runing time is insufficient or too long, and it is bad or return the excessive problem of liquid to avoid the occurrence of oil return effect, improve oil return efficiency and
Oil return effect, improves system reliability.
In the present embodiment, it is illustrated by taking multi-online air-conditioning system as an example, shown in Figure 1, air-conditioning system includes room
Outer machine 20 and three indoor units 11,12,13, indoor unit mainly include indoor fan, indoor heat exchanger, throttling electric expansion valve
It mainly include compressor 21, oil eliminator 22, check valve 23, four-way valve 24, outdoor heat exchanger 25, main electronics Deng, outdoor unit 20
Expansion valve 26, gas-liquid separator 27, tracheae shut-off valve 2J1, liquid pipe shut-off valve 2J2 etc..It is set on the gas exhaust piping of compressor 21
It is equipped with high-pressure pressure sensor S1, low-pressure sensor S3 is provided in the return line of compressor 21, in four-way valve 24
It is provided with temperature sensor T3 on the connecting line of tracheae shut-off valve 2J1, it is shown in Figure 1 for detecting refrigerant temperature.
When system heating operation, the circulating path of refrigerant is compressor 21- oil eliminator 22- check valve 23- four-way valve 24-
The main electric expansion valve 26- outdoor heat exchanger 25- four-way valve 24- gas-liquid of tracheae shut-off valve 2J1- indoor unit-liquid pipe shut-off valve 2J2-
Separator 27- compressor 21.
When cooling system is run, the circulating path of refrigerant is compressor 21- oil eliminator 22- check valve 23- four-way valve 24-
The main electric expansion valve 26- liquid pipe shut-off valve 2J2- indoor unit of outdoor heat exchanger 25--tracheae shut-off valve 2J1- four-way valve 24- gas-liquid
Separator 27- compressor 21.
When system oil return is run, identical when the circulating path of refrigerant is with refrigerating operaton, only indoor fan is inoperative.
Below with reference to Fig. 2, the air-conditioning system method for controlling oil return of the present embodiment is illustrated, following step is specifically included
It is rapid:
Step S11: judge whether to meet oil return operation entry condition.
Since system is in heating operation and refrigerating operaton, it is different that oil return runs entry condition, thus also need to judge be
System is heating operation or refrigerating operaton.If system heating operation, it is system loading rate≤20% that oil return, which runs entry condition,
And heating operation accumulated time >=2 hour；If cooling system is run, it is system loading rate≤20% that oil return, which runs entry condition,
And refrigerating operaton accumulated time >=4 hour.
When system heating operation: when system loading rate≤20% and heating operation accumulated time >=2 hour, that is, meeting back
Oil operation entry condition, control four-way valve commutation, indoor fan are shut down, are run into oil return, and step S12 is executed.
Noise is generated in order to avoid four-way valve commutates, Compressor Discharge Pressure Pd is obtained by high-pressure pressure sensor S1,
Compressor return air pressure Psat is obtained by low-pressure sensor S3, according to the two pressure difference, compressor frequency is controlled, makes height
Pressure difference is in OK range (such as 0.3MPa), then controls four-way valve commutation, noise is generated when four-way valve being avoided to commutate.
When cooling system is run: when system loading rate≤20% and refrigerating operaton accumulated time >=4 hour, that is, meeting back
Oil operation entry condition, control indoor fan are shut down, are run into oil return, and step S12 is executed.
Step S12: when oil return runs and enters, compressor target frequency is set as oil return frequency f0, resets effective oil return
Running time T x.
According to the difference of indoor unit, oil return frequency f0 can be according to being actually configured.Oil return frequency f0 is generally compressor
The 75%~85% of highest frequency guarantees that the gas flow rate in compressor return air pipe is bigger (such as so that compressor high frequency is run
Gas flow rate is greater than 8m/s), to improve gas flow rate, to improve oil return efficiency.In the present embodiment, oil return frequency f0 is preferred
It is the 80% of compressor highest frequency.
Effective oil return running time T x is set, and is reset, is i.e. setting Tx=0.
Step S13: detection back pressure Psat, and obtain the corresponding refrigerant saturation temperature Tsat of back pressure Psat.
Back pressure Psat is obtained by the low-pressure sensor S3 being mounted on 21 muffler of compressor, and according to public affairs
FormulaCalculate the corresponding refrigerant saturation temperature Tsat of back pressure Psat.
A1, a2, a3 are refrigerant coefficient, and refrigerant type is different, and refrigerant coefficient is also different.For example, when refrigerant be R410A and
When R407C, refrigerant coefficient is difference.Specific refrigerant coefficient selection, can refer to the prior art, details are not described herein again.
Step S14: the refrigerant temperature T in detection four-way valve and tracheae shut-off valve connecting line.
Refrigerant temperature is obtained by the temperature sensor T3 being mounted on four-way valve 24 and tracheae shut-off valve 2J1 connecting line
T。
Step S15: the absolute value △ T of Tsat and T difference are obtained.
Calculation formula is △ T=ABS (Tsat-T).ABS is absolute value sign.
△ T is also referred to as the degree of superheat.When △ T is smaller, it is more to return liquid；When △ T is larger, it is less to return liquid.
Step S16: judge whether to meet △ T≤setting difference and compressor actual frequency f >=setpoint frequency.
If so, thening follow the steps S17.
Step S17: Tx=Tx+ △ Tx is calculated.
I.e. when meeting △ T≤setting difference and compressor actual frequency f >=setpoint frequency, when just being run to effective oil return
Between Tx add value added △ Tx.
In the present embodiment, difference is set as 4 DEG C~6 DEG C, and when △ T≤setting difference, system time liquid is more, to mention
High oil return efficiency and oil return effect.In the present embodiment, setting difference is preferably 5 DEG C.
In the present embodiment, setpoint frequency is 0.4f0~0.6f0, cold when compressor actual frequency f >=setpoint frequency
Matchmaker's flow velocity is larger, and oil return is high-efficient, oil return effect is good.In the present embodiment, setpoint frequency is preferably 0.5f0.
Only when △ T and f meet above-mentioned condition, just effective oil return running time T x is increased, to both guarantee
It is more that system returns liquid, and guarantees that refrigerant flow rate is larger, to effectively improve oil return efficiency and oil return effect.
In the present embodiment, value added △ Tx be 8f/f0~12f/f0, both avoided as Tx increase it is too fast caused by oil return
Runing time is too short, also avoids oil return runing time caused by increasing as Tx slowly too long, to improve oil return effect.?
In the present embodiment, value added △ Tx is preferably 10f/f0.
Step S18: whether judge Tx >=the effective oil return runing time of setting.
If Tx < sets effective oil return runing time, continue oil return operation.
During oil return operation, is recycled every setting time and execute step S13~S18.
If the effective oil return runing time of Tx >=setting, thens follow the steps S19: exiting oil return operation.
If air-conditioning system is heating mode before entering oil return operation, when exiting oil return operation, four-way is controlled
Valve commutation, starts indoor fan, and air conditioner continues heating operation.If air-conditioning system is refrigeration mould before entering oil return operation
Formula starts indoor fan then when exiting oil return operation, and air conditioner continues refrigerating operaton.
In the present embodiment, effective oil return runing time is set as 60s~80s, both guarantees enough oil return runing times,
Oil return overlong time is avoided again, so that air-conditioning system had not only had good oil return effect, but also oil return efficiency with higher.
In the present embodiment, setting effective oil return runing time is preferably 70s.
In the present embodiment, setting time is 5s~15s, has not only avoided setting time is too short from causing system burden overweight, but also
Avoid oil return overlong time caused by setting time is too long, cycle detection frequency is too short；To guarantee oil return efficiency and oil return
Effect.In the present embodiment, setting time is preferably 10s.
Further, the control method of the present embodiment further include: when oil return runs and enters, timing parameter t is set, it is right
Entire oil return runing time carries out timing；During oil return operation, whether timing parameter t is judged >=setting oil return runing time；
If so, exiting oil return operation.The design avoids the hair that oil return operating condition can not be exited as caused by Tx calculating mistake
It is raw.
That is, exiting oil return when the effective oil return runing time of Tx >=setting or t >=setting oil return runing time
Operation；It avoids calculating the generation that can not exit oil return operation problem caused by mistake or t timing error as Tx, to avoid back
Oily runing time is too long, improves system reliability of operation.
In the present embodiment, set oil return runing time as 240s~360s, i.e., 4 minutes~6 minutes, to avoid oil return
Runing time is too long, improves system reliability.In the present embodiment, setting oil return runing time is preferably 5 minutes.
The air-conditioning system method for controlling oil return of the present embodiment makes system height using the intersolubility of refrigerant liquid and refrigeration oil
Frequency returns gas carrying liquid operating, and the refrigeration oil that pipeline and indoor unit accumulate is recovered in gas-liquid separator, and controls oil return operation
Time avoids oil return runing time too long or too short, improves oil return efficiency, avoids liquid measure excessive, improves oil return effect, improves
System reliability of operation.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of air-conditioning system method for controlling oil return, it is characterised in that: the described method includes:
When oil return runs and enters, compressor target frequency is set as oil return frequency f0, effective oil return running time T x, which is arranged, is
Zero；
During oil return operation, operations described below is carried out every setting time:
(a) back pressure Psat is detected, and obtains the corresponding refrigerant saturation temperature Tsat of the back pressure Psat；
(b) the refrigerant temperature T in four-way valve and tracheae shut-off valve connecting line is detected, and obtains the absolute value of Tsat Yu T difference
△T；
(c) judge whether to meet △ T≤setting difference and compressor actual frequency f >=setpoint frequency；
If so, calculating Tx=Tx+ △ Tx, △ Tx is value added；
Whether judge Tx >=the effective oil return runing time of setting；
If so, exiting oil return operation.
2. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: according to formulaThe corresponding refrigerant saturation temperature Tsat of back pressure Psat is obtained,
Wherein, a1, a2, a3 are refrigerant coefficient.
3. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: by being mounted on compressor return air
Low-pressure sensor on pipe obtains back pressure Psat, by being mounted on four-way valve and tracheae shut-off valve connecting line
Temperature sensor obtains refrigerant temperature T.
4. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: the method also includes:
When oil return runs and enters, timing parameter t is set, timing is carried out to entire oil return runing time；
During oil return operation, judge whether timing parameter t is more than or equal to setting oil return runing time；
If so, exiting oil return operation.
5. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: the method also includes:
Oil return operation enter before, judge air-conditioning system whether heating operation；
If so, control four-way valve commutation, indoor fan is shut down, is run into oil return when meeting oil return operation entry condition；
When exiting oil return operation, control four-way valve commutation, indoor fan starting, air-conditioning system continuation heating operation.
6. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: the oil return frequency f0 is compression
The 75%~85% of machine highest frequency.
7. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: the difference that sets is 4 DEG C~6
DEG C, the setpoint frequency is 0.4f0~0.6f0.
8. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: the value added △ Tx is 8f/
F0~12f/f0.
9. air-conditioning system method for controlling oil return according to claim 4, it is characterised in that: the effective oil return operation of setting
Time is 60s~80s, and the oil return runing time that sets is 240s~360s.
10. air-conditioning system method for controlling oil return according to claim 1, it is characterised in that: the setting time be 5s~
15s。
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| CN201610111876.2A CN105758065B (en) | 2016-02-29 | 2016-02-29 | A kind of air-conditioning system method for controlling oil return |
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