CN103162469A - Oil return control method and device of air conditioner and air conditioner - Google Patents
Oil return control method and device of air conditioner and air conditioner Download PDFInfo
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- CN103162469A CN103162469A CN2011104317892A CN201110431789A CN103162469A CN 103162469 A CN103162469 A CN 103162469A CN 2011104317892 A CN2011104317892 A CN 2011104317892A CN 201110431789 A CN201110431789 A CN 201110431789A CN 103162469 A CN103162469 A CN 103162469A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003507 refrigerant Substances 0.000 claims abstract description 12
- 239000003921 oil Substances 0.000 claims description 166
- 238000001514 detection method Methods 0.000 claims description 37
- 238000012545 processing Methods 0.000 claims description 27
- 238000001704 evaporation Methods 0.000 claims description 15
- 239000010725 compressor oil Substances 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000001595 flow curve Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 239000010687 lubricating oil Substances 0.000 description 22
- 235000003642 hunger Nutrition 0.000 description 10
- 230000037351 starvation Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000003134 recirculating effect Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000015927 pasta Nutrition 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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Abstract
The invention discloses an oil return control method and device of an air conditioner and the air conditioner. The oil return control method of the air conditioner comprises the following steps: detecting the flow velocity v of the refrigerant in the oil return pipeline; comparing said flow velocity v with a preset flow velocity vminWherein the preset flow rate vminThe minimum flow rate of the refrigerant required when the air conditioner returns oil; and upon determining that the flow velocity v is less than or equal to the preset flow velocity vminAnd controlling the air conditioner to execute oil return treatment. The invention solves the problem that the compressor is easy to be damaged due to oil shortage when the refrigerant runs at low speed in the prior art, thereby achieving the effect of prolonging the service life of the compressor.
Description
Technical field
The present invention relates to the air-conditioner field, in particular to a kind of method for controlling oil return, device and air-conditioner of air-conditioner.
Background technology
During the air-conditioning system operation, parts of lubricating oil can be discharged compressor together along with cold-producing medium, enters into system pipe arrangement, condenser and evaporimeter, only has the lubricating oil that ought be drained in system can turn back to smoothly compressor, maintain oily dynamic equilibrium, just can guarantee not oil starvation of compressor.Otherwise its pasta descends, the phenomenon that there will be compressor to burn because of oil starvation.Therefore certain oil reserve is the fundamental prerequisite that guarantees the compressor reliability service, while only having the minimum oil mass needed over it when oil reserve, and guarantee compressor safe and reliable operation.The compressor oil reserve is mainly determined by oil drain quantity and the recirculating oil quantity of compressor.Oil drain quantity is larger, and recirculating oil quantity is fewer, and oil reserve is fewer; Oil drain quantity is fewer, and recirculating oil quantity is larger, and oil reserve is larger.
Lubricating oil is brought back compressor with flow of refrigerant, in the situation that lubricating oil selected (generally selected by compressor producer), the cold-producing medium flow velocity is faster, more be conducive to oil is brought back to compressor, but at cold-producing medium during with less flow rate, can't in time lubricating oil be taken back to compressor, if compressor, for a long time in this situation, will cause compressor to damage because of oil starvation.
Problem in correlation technique, easily causing compressor to damage because of oil starvation during the cold-producing medium low cruise, not yet propose effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of method for controlling oil return, device and air-conditioner of air-conditioner, the problem that easily causes compressor to damage because of oil starvation when solving cold-producing medium low cruise in prior art.
To achieve these goals, according to an aspect of the present invention, provide a kind of method for controlling oil return of air-conditioner, having comprised: the flow velocity v that detects cold-producing medium in oil returning tube; More described flow velocity v and preset flow rate v
minsize, wherein, described preset flow rate v
minthe minimum flow velocity of required cold-producing medium during for described air conditioner oil returning; And judging that described flow velocity v is less than or equal to described preset flow rate v
minthe time, control air-conditioner and carry out the oil return processing.
Further, judging that flow velocity v is less than or equal to preset flow rate v
minthe time, control air-conditioner execution oil return processing and comprise: judging 0
the time, control air-conditioner and carry out oil return processing at interval of the first Preset Time; And judging
the time, control air-conditioner and carry out oil return processing at interval of the second Preset Time, wherein, the first Preset Time is greater than the second Preset Time.
Further, flow velocity v comprises the first flow velocity v
1with the second flow velocity v
2, wherein, the first flow velocity v
1for the flow velocity of cold-producing medium in the VERTICAL TUBE of oil returning tube, the second flow velocity v
2for the flow velocity of cold-producing medium in the horizontal tube of oil returning tube, preset flow rate v
mincomprise the first preset flow rate v
1minwith the second preset flow rate v
2min, wherein, the first preset flow rate v
1minthe minimum flow velocity of the required cold-producing medium of VERTICAL TUBE during for air conditioner oil returning, the second preset flow rate v
2minthe minimum flow velocity of the required cold-producing medium of horizontal tube during for air conditioner oil returning, judging that flow velocity v is less than or equal to preset flow rate v
minthe time, control air-conditioner execution oil return processing and comprise: judging the first flow velocity v
1be less than or equal to the first preset flow rate v
1min, or the second flow velocity v
2be less than or equal to the second preset flow rate v
2minthe time, control air-conditioner and carry out the oil return processing.
Further, in the detection oil returning tube, the flow velocity v of cold-producing medium comprises: the running frequency f that detects the compressor of air-conditioner; Detect the condensing pressure p of condensing agent
cwith evaporating pressure p
e; And according to running frequency f and condensing pressure p
cand evaporating pressure p
ecalculate the flow velocity v of cold-producing medium in oil returning tube.
Further, calculate the flow velocity v of cold-producing medium in oil returning tube by following formula:
Wherein, q
vafor the actual output of gas of compressor, η
vfor the volumetric efficiency of compressor, q
vtfor the theoretical displacement of compressor, λ
vfor clearance volume coefficient, λ
tfor temperature coefficient, the revolutional slip of the motor that s is compressor, V
pfor the swept volume of the cylinder of compressor, the maximum caliber of the VERTICAL TUBE that D is oil returning tube or horizontal tube, the number of poles that P is compressor, c is relative clearance volume, and m is adiabatic exponent, in conjunction with the experiment flow curve formula computed volume efficiency eta of compressor
v, temperature coefficient λ
t, relative clearance volume c and adiabatic exponent m, experiment flow curve formula is
wherein, v
bfor specific volume, n is compressor rotary speed, and M is refrigerant flow.
Further, preset flow rate v
minset in the following manner: the outdoor environment temperature T while detecting air-conditioner work; And by outdoor environment temperature T during to the compressor oil return standard minimum flow velocity of cold-producing medium revised, obtain preset flow rate v
min.
Further, by following formula, the standard minimum flow velocity of cold-producing medium is revised during to the compressor oil return, obtains preset flow rate v
min:
v
min＝a
1+a
2T+a
3T
2，
Wherein, a
1, a
2and a
3for dimensionless factor.
To achieve these goals, according to a further aspect in the invention, provide a kind of oil return control device of air-conditioner, any one method for controlling oil return provided for carrying out the invention described above.
To achieve these goals, according to a further aspect in the invention, provide a kind of oil return control device of air-conditioner, further, having comprised: detection module, for detection of the flow velocity v of cold-producing medium in oil returning tube; Comparison module, for comparing flow velocity v and preset flow rate v
minsize, wherein, preset flow rate v
minthe minimum flow velocity of required cold-producing medium during for air conditioner oil returning; And control module, for judging that flow velocity v is less than or equal to preset flow rate v
minthe time, control air-conditioner and carry out the oil return processing.
Further, control module comprises: the first control module, and for judging
the time, control air-conditioner and carry out oil return processing at interval of the first Preset Time; And second control module, for judging
the time, control air-conditioner and carry out oil return processing at interval of the second Preset Time, wherein, the first Preset Time is greater than the second Preset Time.
Further, detection module comprises: first detection module, for detection of the running frequency f of the compressor of air-conditioner; The second detection module, for detection of the condensing pressure p of condensing agent
cwith evaporating pressure p
e; And computing module, for according to running frequency f and condensing pressure p
cand evaporating pressure p
ecalculate the flow velocity v of cold-producing medium in oil returning tube.
Further, detection module comprises: the 3rd detection module, the outdoor environment temperature T while working for detection of air-conditioner; And correcting module, for by outdoor environment temperature T during to the compressor oil return standard minimum flow velocity of cold-producing medium revised, obtain preset flow rate v
min.
To achieve these goals, according to a further aspect in the invention, provide a kind of air-conditioner, comprised any oil return control device that foregoing of the present invention provides.
By the present invention, adopt the flow velocity v that detects cold-producing medium in oil returning tube, more described flow velocity v and preset flow rate v
minsize, wherein, described preset flow rate v
minthe minimum flow velocity of required cold-producing medium during for described air conditioner oil returning, and judging that described flow velocity v is less than or equal to described preset flow rate v
minthe time, control air-conditioner and carry out the oil return processing, by detecting the flow velocity of cold-producing medium in oil returning tube, and this flow velocity and preset flow rate are compared, to judge in oil returning tube that whether cold-producing medium is in the low speed flow regime, when it during in the low speed flow regime, control air-conditioner and carry out the oil return processing, avoided because cold-producing medium can't be taken back lubricating oil the phenomenon that compressor causes the long-time oil starvation of compressor when low speed flows, the problem that has easily caused compressor to damage because of oil starvation while having solved cold-producing medium low cruise in the prior art, and then reached the effect that extends compressor life-span.
The accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the oil return control device of first embodiment of the invention;
Fig. 2 is the schematic diagram according to the oil return control device of second embodiment of the invention;
Fig. 3 is the flow chart according to the method for controlling oil return of first embodiment of the invention; And
Fig. 4 is the flow chart according to the method for controlling oil return of second embodiment of the invention.
The specific embodiment
It should be noted that, in the situation that do not conflict, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 1 is the schematic diagram according to the oil return control device of first embodiment of the invention, and as shown in Figure 1, the oil return control device of this embodiment comprises: detection module 10, comparison module 20 and control module 30.
Detection module, for detection of the flow velocity v of cold-producing medium in oil returning tube.Particularly, comprise the flow velocity v of cold-producing medium in the vertical tube of oil returning tube
1flow velocity v with cold-producing medium in the horizontal tube of oil returning tube
2, flow velocity v
1with flow velocity v
2the oil return situation of lubricating oil in the time of can reflecting flow of refrigerant.
Comparison module, for comparing flow velocity v and preset flow rate v
minsize, wherein, preset flow rate v
minthe minimum flow velocity of required cold-producing medium during for air conditioner oil returning.Particularly, compare respectively flow velocity v
1with the first preset flow rate v
1minsize, and flow velocity v
2with the second preset flow rate v
2minsize.
Control module, for judging that flow velocity v is less than or equal to preset flow rate v
minthe time, control air-conditioner and carry out the oil return processing.Particularly, judging flow velocity v
1be less than or equal to the first preset flow rate v
1min, or flow velocity v
2be less than or equal to the second preset flow rate v
2minthe time, control air-conditioner and carry out the oil return processing.
By detecting the flow velocity of cold-producing medium in oil returning tube, and this flow velocity and preset flow rate are compared, to judge in oil returning tube that whether cold-producing medium is in the low speed flow regime, when it during in the low speed flow regime, control air-conditioner and carry out the oil return processing, reached and avoided because cold-producing medium can't be taken back lubricating oil the effect that compressor causes the long-time oil starvation of compressor when low speed flows.
Fig. 2 is the schematic diagram according to the oil return control device of second embodiment of the invention, as shown in Figure 2, oil return control device in this embodiment comprises: detection module 10, comparison module 20 and control module 30, wherein, control module 30 comprises the first control module 31 and the second control module 32, and detection module comprises first detection module 11, the second detection module 12, computing module 13, the 3rd detection module 14 and correcting module 15.
First detection module 11, for detection of the running frequency f of the compressor of air-conditioner.
The second detection module 12, for detection of the condensing pressure p of condensing agent
cwith evaporating pressure p
e.
Computing module 13, for according to running frequency f and condensing pressure p
cand evaporating pressure p
ecalculate the flow velocity v of cold-producing medium in oil returning tube.
The 3rd detection module 14, the outdoor environment temperature T while working for detection of air-conditioner.
Correcting module 15, for by outdoor environment temperature T during to the compressor oil return standard minimum flow velocity of cold-producing medium revised, obtain preset flow rate v
min.
Wherein, calculate the flow velocity v of cold-producing medium in oil returning tube by following formula:
Wherein, q
vafor the actual output of gas of compressor, η
vfor the volumetric efficiency of compressor, q
vtfor the theoretical displacement of compressor, λ
vfor clearance volume coefficient, λ
tfor temperature coefficient, the revolutional slip of the motor that s is compressor, V
pfor the swept volume of the cylinder of compressor, the maximum caliber of the VERTICAL TUBE that D is oil returning tube or horizontal tube, the number of poles that P is compressor, c is relative clearance volume, and m is adiabatic exponent, in conjunction with the experiment flow curve formula computed volume efficiency eta of compressor
v, temperature coefficient λ
t, relative clearance volume c and adiabatic exponent m, experiment flow curve formula is
wherein, v
bfor specific volume, n is compressor rotary speed, and M is refrigerant flow.
In the foregoing description, flow velocity v comprises the first flow velocity v
1with the second flow velocity v
2, wherein, the first flow velocity v
1for the flow velocity of cold-producing medium in the VERTICAL TUBE of oil returning tube, the second flow velocity v
2for the flow velocity of cold-producing medium in the horizontal tube of oil returning tube, when needs detect the first flow velocity v
1the time, correspondingly, the condensing pressure p of the condensing agent of detection
cwith evaporating pressure p
econdensing pressure and the return pressure of cold-producing medium in the oil returning tube VERTICAL TUBE, the maximum caliber of the VERTICAL TUBE that D is oil returning tube; When needs detect the second flow velocity, correspondingly, the condensing pressure p of the condensing agent of detection
cwith evaporating pressure p
econdensing pressure and the return pressure of cold-producing medium in the oil returning tube horizontal tube, the maximum caliber of the horizontal tube that D is oil returning tube.
By following formula, the standard minimum flow velocity of cold-producing medium is revised during to the compressor oil return, obtains preset flow rate v
min:
v
min＝a
1+a
2T+a
3T
2，
Wherein, a
1, a
2and a
3for dimensionless factor.
Because ambient temperature effect oil body and solubility, different environment temperatures can cause the different solubility of lubricating oil in cold-producing medium, by environment temperature, the standard minimum flow velocity of cold-producing medium is revised during to the compressor oil return, has guaranteed the compressor accuracy of the required minimum cold-producing medium flow velocity of oil return smoothly.
At comparison module 20, judge
the time, the first control module 31 is controlled air-conditioner at interval of an oil return of the first Preset Time operation; At comparison module 20, judge
the time, the second control module 32 is controlled air-conditioner at interval of an oil return of the second Preset Time operation, and wherein, the first Preset Time is greater than the second Preset Time.
In the foregoing description, preset flow rate v
mincomprise the first preset flow rate v
1minwith the second preset flow rate v
2min, wherein, the first preset flow rate v
1minthe minimum flow velocity of the required cold-producing medium of VERTICAL TUBE during for air conditioner oil returning, the second preset flow rate v
2minthe minimum flow velocity of the required cold-producing medium of horizontal tube pipe during for air conditioner oil returning, judge at comparison module 20
the time, the first control module 31 is controlled air-conditioner and is comprised at interval of an oil return of the first Preset Time operation: at comparison module 20, judge
Or
The time, the first control module 31 is controlled air-conditioner at interval of an oil return of the first Preset Time operation, at comparison module 20, judges
the time, the second control module 32 is controlled air-conditioner and is comprised at interval of an oil return of the second Preset Time operation: at comparison module 20, judge
or
the time, the second control module 32 is controlled air-conditioner at interval of an oil return of the second Preset Time operation.
The running frequency of compressor and cold-producing medium corresponding condensing pressure respectively in vertical pipe and horizontal pipe when detecting the air-conditioner operation, evaporating pressure is to calculate the first flow velocity and second flow velocity of cold-producing medium in oil returning tube, realized judging more accurately the effect of cold-producing medium flow velocity, again by the first flow velocity and the second flow velocity are compared with the first preset flow rate and the second preset flow rate respectively, to judge the flow rate regime of cold-producing medium in oil returning tube, and then carry out corresponding oil return and process, realize controlling in time when low speed flows at cold-producing medium air-conditioner and carried out the oil return processing, the problem that has easily caused compressor to damage because of oil starvation while having solved cold-producing medium low cruise in the prior art, and then reached the effect that extends compressor life-span.
Fig. 3 is the flow chart according to the method for controlling oil return of first embodiment of the invention, and as shown in Figure 3, the method for controlling oil return of this embodiment comprises: step S302 is to step S306.
S302: the flow velocity v that detects cold-producing medium in oil returning tube.Particularly, comprise the flow velocity v of cold-producing medium in the vertical tube of oil returning tube
1flow velocity v with cold-producing medium in the horizontal tube of oil returning tube
2, flow velocity v
1with flow velocity v
2the oil return situation of lubricating oil in the time of can reflecting flow of refrigerant.
S304: more described flow velocity v and preset flow rate v
minsize, wherein, described preset flow rate v
minthe minimum flow velocity of required cold-producing medium during for described air conditioner oil returning.Particularly, compare respectively flow velocity v
1with the first preset flow rate v
1minsize, and flow velocity v
2with the second preset flow rate v
2minsize.
S306: judging that described flow velocity v is less than or equal to described preset flow rate v
minthe time, control air-conditioner and carry out the oil return processing.Particularly, flow velocity v
1be less than or equal to the first preset flow rate v
1min, or flow velocity v
2be less than or equal to the second preset flow rate v
2minthe time, control air-conditioner and carry out the oil return processing.
By detecting the flow velocity of cold-producing medium in oil returning tube, and this flow velocity and preset flow rate are compared, to judge in oil returning tube that whether cold-producing medium is in the low speed flow regime, when it during in the low speed flow regime, control air-conditioner and carry out the oil return processing, reached and avoided because cold-producing medium can't be taken back lubricating oil the effect that compressor causes the long-time oil starvation of compressor when low speed flows.
Fig. 4 is the flow chart according to the method for controlling oil return of second embodiment of the invention, as shown in Figure 4, the method for controlling oil return of this embodiment comprises: at first in system, input maximum VERTICAL TUBE and the maximum horizontal pipe caliber of installing, then by the system running frequency and the height that detect, low pressure, calculate pressure ratio and cold-producing medium flow velocity, by the temperature detected, correction formula by the required minimum cold-producing medium flow velocity of system oil return is calculated required minimum flow velocity, finally compare cold-producing medium flow velocity and the smooth required minimum cold-producing medium flow velocity of oil return of the reality of system, and then judge whether to need operation oil return program and oil return interval time.
If if at the v of VERTICAL TUBE place
1>v
1minand at the v of horizontal tube place
2>v
2min, the operation that maintains the original state, without operation oil return program; If in VERTICAL TUBE
or
the time, every T2 (1 hour) time period, carry out oil return operation; Other situation, every T1 (2 hours) time period, carry out oil return operation.
Cold-producing medium along the journey evaporation, is swept along the oil droplet oil return by refrigerant gas stream in pipeline.Oil return situation quality depends on dissolubility, flow velocity and oil viscosity.In the situation that lubricating oil selected (generally selected by compressor producer), the cold-producing medium flow velocity is faster, more is conducive to oil and gets back to compressor.
The computing formula of the actual exhaust air amount of compressor can be expressed as:
In formula, q
vaactual output of gas (unit: cm for compressor
3/ s), η
vfor the volumetric efficiency of compressor, q
vtfor the theoretical displacement of compressor (unit: cm
3/ s), n be compressor rotary speed (unit: rev/s), V
pdisplacement (unit: cm for compressor
3/ rev), and the frequency that f is compressor (unit: HZ), the revolutional slip that s is compressor electric motor, synchronous motor is got the number of poles that 0, p is compressor.
Wherein, λ
vfor the clearance volume coefficient, can be expressed as:
In formula, C is relative clearance volume, generally gets C≤1.5%, and ε is pressure ratio, and m is adiabatic exponent, p
ccondensing pressure, p
efor evaporating pressure.
λ
pfor pressure coefficient, mean the impact of pressure of inspiration(Pi) loss on the compressor displacement, because rotor compressor does not have inlet valve, to rotor compressor, can be similar to and think λ
p=1.
λ
tfor temperature coefficient, reflection sucks the loss that gas is heated the compressor displacement caused, and when pressure ratio ε is 1.5 to 8, can be similar to and gets λ
t=0.98～0.85;
λ
dfor revealing coefficient, the impact of reflection Leakage Gas on the compressor displacement, under general operating mode, can be similar to and get λ
d=λ
v.
The cold-producing medium flow velocity can be expressed as:
In formula, (unit: cm/s), M is that (unit: kg/s), D is that (unit: cm), A is caliber area (unit: cm to caliber to refrigerant flow to the flow velocity that v is cold-producing medium
2), ρ is refrigerant density (unit: kg/cm
3).
Compressor producer all can provide the experiment flow curve of this compressor in the compressor specifications, according to formula: nV
pη
v=Mv
b, that is,
v in formula
bfor specific volume (cm
3/ kg), the experiment gained volumetric efficiency of this compressor can be calculated, and then relative clearance volume c, adiabatic exponent m and the temperature coefficient λ of this compressor can be calculated
t.So far, just can draw the cold-producing medium velocity formula of the refrigeration system of using this compressor.
Consult any a compressor specifications, the lubricating oil that can be guaranteed is got back to the required horizontal tube standard minimum flow velocity of compressor and VERTICAL TUBE standard minimum flow velocity smoothly.In this embodiment, consult the compressor specifications, can guarantee that it is to be more than 4m/s at the horizontal tube place that lubricating oil is got back to the required cold-producing medium standard minimum flow velocity of compressor smoothly, at the VERTICAL TUBE place is more than 7m/s.But the dissolubility of the environment temperature of system, lubricating oil viscosity and lubricating oil and cold-producing medium, these all can affect lubricating oil and turn back to smoothly the required cold-producing medium flow velocity of compressor.The internal friction of the large oil of viscosity is large, the poor mobile performance of oil, and the required cold-producing medium minimum flow velocity of the smooth oil return of system is just larger; The solubility of lubricating oil in cold-producing medium is less, and lubricating oil is also with regard to more difficult being brought back in compressor, and the required cold-producing medium minimum flow velocity of the smooth oil return of system liquid is just larger.Environment temperature affects oil body and solubility.Environment temperature is lower, and the solubility of excessive, the lubricating oil of lubricating oil viscosity and cold-producing medium is just less, and the required cold-producing medium flow velocity of oil return is just larger smoothly to guarantee compressor.
In this embodiment, by the great many of experiments to compressor (cold-producing medium is R410A, and lubricating oil is FV50S), the relation that draws minimum cold-producing medium flow velocity that its smooth oil return is required and outdoor environment temperature is as following table:
Experimental data is carried out to matching can be obtained:
The required minimum cold-producing medium flow velocity of VERTICAL TUBE is:
v
1min＝f(T)＝a
1+a
2T+a
3T
2＝6.8-0.0247T+0.006T
2
The required minimum cold-producing medium flow velocity of horizontal tube is:
v
2min＝g(T)＝b
1+b
2T+b
3T
2＝3.7-0.0618T+0.0035T
2
By above-mentioned matching correction formula, when compressor is at the varying environment temperature, can fast direct ground connection judge the required minimum cold-producing medium flow velocity of the smooth oil return of compressor.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, perhaps they are made into respectively to each integrated circuit modules, perhaps a plurality of modules in them or step being made into to the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. the method for controlling oil return of an air-conditioner, is characterized in that, comprising:
Detect the flow velocity v of cold-producing medium in oil returning tube;
More described flow velocity v and preset flow rate v
minsize, wherein, described preset flow rate v
minthe minimum flow velocity of required cold-producing medium during for described air conditioner oil returning; And
Judging that described flow velocity v is less than or equal to described preset flow rate v
minthe time, control air-conditioner and carry out the oil return processing.
2. method for controlling oil return according to claim 1, is characterized in that, judging that described flow velocity v is less than or equal to described preset flow rate v
minthe time, control air-conditioner execution oil return processing and comprise:
Judging
the time, control described air-conditioner and carry out oil return processing at interval of the first Preset Time; And
Judging
the time, control described air-conditioner and carry out oil return processing at interval of the second Preset Time, wherein, described the first Preset Time is greater than described the second Preset Time.
3. method for controlling oil return according to claim 1, is characterized in that,
Described flow velocity v comprises the first flow velocity v
1with the second flow velocity v
2, wherein, described the first flow velocity v
1for the flow velocity of described cold-producing medium in the VERTICAL TUBE of described oil returning tube, described the second flow velocity v
2for the flow velocity of described cold-producing medium in the horizontal tube of described oil returning tube,
Described preset flow rate v
mincomprise the first preset flow rate v
1minwith the second preset flow rate v
2min, wherein, described the first preset flow rate v
1minthe minimum flow velocity of the required cold-producing medium of described VERTICAL TUBE during for described air conditioner oil returning, described the second preset flow rate v
2minthe minimum flow velocity of the required cold-producing medium of described horizontal tube during for described air conditioner oil returning,
Judging that described flow velocity v is less than or equal to described preset flow rate v
minthe time, control air-conditioner execution oil return processing and comprise: judging described the first flow velocity v
1be less than or equal to described the first preset flow rate v
1min, or described the second flow velocity v
2be less than or equal to described the second preset flow rate v
2minthe time, control described air-conditioner and carry out the oil return processing.
4. method for controlling oil return according to claim 1, is characterized in that, the flow velocity v that detects cold-producing medium in oil returning tube comprises:
Detect the running frequency f of the compressor of described air-conditioner;
Detect the condensing pressure p of described condensing agent
cwith evaporating pressure p
e; And
According to described running frequency f and described condensing pressure p
cand described evaporating pressure p
ecalculate the flow velocity v of cold-producing medium described in described oil returning tube.
5. method for controlling oil return according to claim 4, is characterized in that, calculates the flow velocity v of cold-producing medium described in described oil returning tube by following formula:
Wherein, q
vafor the actual output of gas of described compressor, η
vfor the volumetric efficiency of described compressor, q
vtfor the theoretical displacement of described compressor, λ
vfor clearance volume coefficient, λ
tfor temperature coefficient, the revolutional slip of the motor that s is described compressor, V
pswept volume for the cylinder of described compressor, the maximum caliber of the VERTICAL TUBE that D is described oil returning tube or horizontal tube, the number of poles that P is described compressor, c is relative clearance volume, m is adiabatic exponent, in conjunction with the experiment flow curve formula of described compressor, calculates described temperature coefficient λ
t, described relative clearance volume c and described adiabatic exponent m, described experiment flow curve formula is
wherein, v
bfor specific volume, n is compressor rotary speed, and M is refrigerant flow.
6. method for controlling oil return according to claim 1, is characterized in that, described preset flow rate v
minset in the following manner:
Outdoor environment temperature T while detecting described air-conditioner work; And
By described outdoor environment temperature T, the standard minimum flow velocity of cold-producing medium is revised during to described compressor oil return, obtains described preset flow rate v
min.
7. method for controlling oil return according to claim 6, is characterized in that, by following formula, the standard minimum flow velocity of cold-producing medium is revised during to described compressor oil return, obtains described preset flow rate v
min:
v
min＝a
1+a
2T+a
3T
2，
Wherein, a
1, a
2and a
3for dimensionless factor.
8. the oil return control device of an air-conditioner, is characterized in that, comprising:
Detection module, for detection of the flow velocity v of cold-producing medium in oil returning tube;
Comparison module, for more described flow velocity v and preset flow rate v
minsize, wherein, described preset flow rate v
minthe minimum flow velocity of required cold-producing medium during for described air conditioner oil returning; And
Control module, for judging that described flow velocity v is less than or equal to described preset flow rate v
minthe time, control air-conditioner and carry out the oil return processing.
9. oil return control device according to claim 8, is characterized in that, described control module comprises:
The first control module, for judging
the time, control described air-conditioner and carry out oil return processing at interval of the first Preset Time; And
The second control module, for judging
the time, control described air-conditioner and carry out oil return processing at interval of the second Preset Time, wherein, described the first Preset Time is greater than described the second Preset Time.
10. oil return control device according to claim 8, is characterized in that, described detection module comprises:
First detection module, for detection of the running frequency f of the compressor of described air-conditioner;
The second detection module, for detection of the condensing pressure p of described condensing agent
cwith evaporating pressure p
e; And
Computing module, for according to described running frequency f and described condensing pressure p
cand described evaporating pressure p
ecalculate the flow velocity v of cold-producing medium described in described oil returning tube.
11. oil return control device according to claim 8, is characterized in that, described detection module comprises:
The 3rd detection module, the outdoor environment temperature T during for detection of described air-conditioner work; And
Correcting module, for by described outdoor environment temperature T during to described compressor oil return the standard minimum flow velocity of cold-producing medium revised, obtain described preset flow rate v
min.
12. an air-conditioner, is characterized in that, comprises the described oil return control device of any one in claim 8 to 11.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1890512A (en) * | 2003-12-10 | 2007-01-03 | 开利公司 | Oil return control in refrigerant system |
| JP2008209105A (en) * | 2007-02-02 | 2008-09-11 | Daikin Ind Ltd | Air conditioner |
| JP2008261603A (en) * | 2007-04-13 | 2008-10-30 | Denso Corp | Refrigerating cycle device and air conditioner for vehicle |
| JP2010175190A (en) * | 2009-01-30 | 2010-08-12 | Daikin Ind Ltd | Air conditioner |
| CN101968248A (en) * | 2010-08-26 | 2011-02-09 | 宁波奥克斯电气有限公司 | Control method for oil return of DC inverter compressor |
| WO2011121634A1 (en) * | 2010-03-29 | 2011-10-06 | 三菱電機株式会社 | Air conditioning apparatus |
-
2011
- 2011-12-19 CN CN201110431789.2A patent/CN103162469B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1890512A (en) * | 2003-12-10 | 2007-01-03 | 开利公司 | Oil return control in refrigerant system |
| JP2008209105A (en) * | 2007-02-02 | 2008-09-11 | Daikin Ind Ltd | Air conditioner |
| JP2008261603A (en) * | 2007-04-13 | 2008-10-30 | Denso Corp | Refrigerating cycle device and air conditioner for vehicle |
| JP2010175190A (en) * | 2009-01-30 | 2010-08-12 | Daikin Ind Ltd | Air conditioner |
| WO2011121634A1 (en) * | 2010-03-29 | 2011-10-06 | 三菱電機株式会社 | Air conditioning apparatus |
| CN101968248A (en) * | 2010-08-26 | 2011-02-09 | 宁波奥克斯电气有限公司 | Control method for oil return of DC inverter compressor |
Cited By (36)
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| CN103486785B (en) * | 2013-09-18 | 2016-05-04 | Tcl空调器(中山)有限公司 | The method for controlling oil return of frequency converting air-conditioner compressor and device thereof |
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| CN110023692B (en) * | 2016-11-24 | 2021-08-06 | 大金工业株式会社 | Refrigerating device |
| CN110023692A (en) * | 2016-11-24 | 2019-07-16 | 大金工业株式会社 | Refrigerating plant |
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