CN104422217A - Oil return control method for refrigeration system - Google Patents
Oil return control method for refrigeration system Download PDFInfo
- Publication number
- CN104422217A CN104422217A CN201310380331.8A CN201310380331A CN104422217A CN 104422217 A CN104422217 A CN 104422217A CN 201310380331 A CN201310380331 A CN 201310380331A CN 104422217 A CN104422217 A CN 104422217A
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- Prior art keywords
- liquid level
- oil return
- preset
- preset temperature
- refrigeration system
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005057 refrigeration Methods 0.000 title claims description 64
- 239000007788 liquid Substances 0.000 claims abstract description 156
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 7
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 152
- 239000003507 refrigerant Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 4
- 235000003642 hunger Nutrition 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000037351 starvation Effects 0.000 description 4
- 230000003134 recirculating effect Effects 0.000 description 3
- 238000002309 gasification Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010725 compressor oil Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses an oil return control method of a refrigerating system, which comprises the following steps: 1) setting a first preset liquid level, a second preset liquid level, a first preset temperature and a second preset temperature, wherein the second preset liquid level is higher than the first preset liquid level, and the second preset temperature is higher than the first preset temperature; 2) detecting the liquid level in the oil return device, comparing the liquid level with a first preset position, and opening the air return port and the liquid inlet when the detected liquid level is less than the first preset liquid level; detecting the temperature of liquid in the oil return device and comparing the temperature with a first preset temperature, and starting heating and opening an air return port when the detected temperature is lower than the first preset temperature; 3) when the detected temperature is greater than or equal to the second preset temperature and the detected liquid level is greater than or equal to the second preset liquid level, entering the next step; 4) and (3) closing the liquid inlet, opening an oil return port for returning oil, and entering the step (2) when the liquid level is detected to be lower than a first preset position. The invention avoids the oil shortage phenomenon of the system, reduces the abrasion condition of the parts and prolongs the service life.
Description
Technical field
The present invention relates to technical field of refrigeration equipment, particularly a kind of refrigeration system method for controlling oil return.
Background technology
In refrigeration systems, refrigerant and refrigeration oil is all needed to be separated, although unit is furnished with refrigerant and oily device for effectively separating, also being separated completely of refrigerant and refrigeration oil cannot be ensured, a small amount of refrigeration oil can be brought into refrigeration piping and heat transmission equipment from cold compressor oil system by high speed refrigerant, the dirts such as oil film are attached on heat exchanger tube, can reduce the heat transfer effect of equipment; Further, a large amount of losses of refrigeration oil can cause internal system part normally to lubricate, as affected the normal operation of compressor.
Therefore, in system, oil return apparatus is set, refrigerant and the mixed liquor of refrigeration oil are entered after oil return apparatus is heated be separated, enter compressor by the oil return opening of oil return apparatus after refrigerant gasification, remaining refrigeration oil enters the return line of compressor by the oil return opening of oil return apparatus.
But, the oil return of oil return apparatus is operating as manual operation and completes, very easily because oil return causes refrigeration oil in the too much or refrigeration piping of refrigeration oil in oil return apparatus too much not in time, cause the phenomenon of system oil starvation, cause the heavy wear because of oil starvation of the parts such as compressor, even compressor damage, affects service life; And refrigeration oil is too much in refrigeration piping, the heat transfer effect of reduction equipment can be made.
Therefore, how in time oil return, avoids heat exchange efficiency to reduce and improves service life, having become those skilled in the art's problem demanding prompt solution.
Summary of the invention
In view of this, the invention provides a kind of refrigeration system method for controlling oil return, so that oil return in time, avoid heat exchange efficiency and reduce and improve service life.
For achieving the above object, the invention provides following technical scheme:
A kind of refrigeration system method for controlling oil return, comprises step:
1) arrange first and preset liquid level, the second default liquid level and the first preset temperature and the second preset temperature, described second presets liquid level presets liquid level higher than first, and described second preset temperature is higher than the first preset temperature;
2) detect the liquid level in oil return apparatus and compare with described first predeterminated position, when detecting liquid level and being less than the described first default liquid level, opening gas returning port and the inlet of described oil return apparatus;
Detect the fluid temperature of oil return apparatus inside and compare with described first preset temperature, when detected temperatures is less than described first preset temperature, starts to heat and open the gas returning port of described oil return apparatus;
3) detected temperatures and liquid level, when detected temperatures be more than or equal to described second preset temperature and detect liquid level be more than or equal to described second preset liquid level time, enter next step;
4) close described inlet, the oil return opening opening described oil return apparatus carries out oil return, when described detection liquid level is lower than described first predeterminated position, enters step 2).
Preferably, in above-mentioned refrigeration system method for controlling oil return, also comprise and arrange the 3rd default liquid level in described step 1), the described 3rd presets liquid level is more than or equal to the described second default liquid level;
Described step 2) be specially, detect the liquid level in oil return apparatus and compare with described first predeterminated position, when detecting liquid level and being less than the described first default liquid level, open gas returning port and the inlet feed liquor of described oil return apparatus, until when the liquid level in described oil return apparatus arrives the described 3rd default liquid level, close described gas returning port and described inlet.
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 2) also comprise: when described detection liquid level is more than or equal to the described first default liquid level, enter next step.
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 2) also comprise: when described detected temperatures is more than or equal to described first preset temperature, enter next step.
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 3) also comprises: when described detection liquid level is less than the described first default liquid level, opens described gas returning port and described inlet feed liquor, enter described step 2).
Preferably, in above-mentioned refrigeration system method for controlling oil return, in described step 3), when described detection liquid level is less than the described first default liquid level, open described inlet feed liquor, until when the liquid level in described oil return apparatus arrives the described second default liquid level, close described inlet, enter described step 2).
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 3) also comprises: when described detected temperatures is less than described second preset temperature, starts heating.
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 4) is specially: keep described inlet and described gas returning port to close, and opens the oil return opening of described oil return apparatus and the pressurization mouth of described oil return apparatus, carries out oil return, enter step 2).
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 2) also comprise: when described detected temperatures arrival institute second states preset temperature, stop heating.
As can be seen from above-mentioned technical scheme, refrigeration system method for controlling oil return provided by the invention, arrange first and preset liquid level and preset temperature, and by feed liquor and heating operation, the fluid temperature in oil return apparatus is made to be more than or equal to preset temperature, detect the liquid level drawn and be more than or equal to the first default liquid level, guarantee that the refrigerant in liquid volatilizees completely and has a certain amount of refrigeration oil in oil return apparatus, carry out oil return.By oil return, the liquid level in oil return apparatus is declined, and repeat feed liquor, oil return operation cycle is run.Provided by the inventionly have control method, by the temperature in oil return apparatus and liquid automatic control oil return, oil return operation can be carried out timely to system, avoid the situation because cold oil in refrigeration pipe too much makes heat exchange efficiency reduce, and, effectively avoid system petrol starvation, reduce component wear situation, improve service life.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The FB(flow block) of the refrigeration system method for controlling oil return that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the oil return apparatus that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
The invention discloses a kind of refrigeration system method for controlling oil return, so that oil return in time, avoid heat exchange efficiency and reduce and improve service life.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1 and Fig. 2, the FB(flow block) of the refrigeration system method for controlling oil return that Fig. 1 provides for the embodiment of the present invention; The structural representation of the oil return apparatus that Fig. 2 provides for the embodiment of the present invention.
Embodiments provide a kind of refrigeration system method for controlling oil return, comprise step:
S1: setting preset value, liquid level L is preset in setting first
1, second preset liquid level L
2and the first preset temperature T
1with the second preset temperature T
2, wherein, second presets liquid level L
2liquid level L is preset higher than first
1, the second preset temperature T
2higher than the first preset temperature T
1;
Arrange first and preset liquid level L
1and second presets liquid level L
2, when the liquid level of the refrigeration oil in oil return apparatus 1 is more than or equal to the second predeterminated position, restrictive condition to liquid level when meeting oil return apparatus 1 oil return operation, and control liquid level after oil return and be less than first and preset liquid level L
1; First preset temperature T is set
1and the second preset temperature T
2, when the temperature of the liquid in oil return apparatus 1 is more than or equal to the first preset temperature T
1time meet the condition of volatilizing that is gasified totally of refrigerant in the mixing material of refrigeration oil and refrigerant, and in order to avoid repeatedly heating, due to the second preset temperature T
2higher than the first preset temperature T
1, control be more than or equal to the second preset temperature T by the fluid temperature in oil return apparatus 1
2adjustment under oil return, when the fluid temperature in oil return apparatus 1 is by the second preset temperature T
2drop to the first preset temperature T
1, continue heating.
S2: detect and compare liquid level, detects the liquid level in oil return apparatus 1 and presets liquid level L with first
1compare, preset liquid level L when detection liquid level L is less than first
1time, open gas returning port 15 and inlet 14 feed liquor of oil return apparatus 1,
Detect and C.T, detect the fluid temperature of oil return apparatus 1 inside and compare with described preset temperature, when detected temperatures T is less than the first preset temperature T
1time, start to heat and the gas returning port 15 opening oil return apparatus 1 is opened;
Bring a small amount of refrigeration oil into refrigeration piping, open oil return operation; Detect the refrigeration oil liquid level in oil return apparatus 1 be less than first preset liquid level L
1time, open gas returning port 15 and the inlet 14 of oil return apparatus 1, make the mixing material of refrigeration oil and refrigerant enter in oil return apparatus 1, the gas in oil return apparatus 1 is discharged by gas returning port 15.It should be noted that, oil return opening 13 now and heater 2 are closed condition.
When detected temperatures T is less than preset temperature, heats, make refrigerant endothermic gasification, discharged by gas returning port 15 mixing material of refrigeration oil and refrigerant, residue refrigeration oil, in oil return apparatus 1, realizes being separated of refrigeration oil and refrigerant.
Wherein, detect liquid level L and preset liquid level L with first
1comparison and detected temperatures T the operating sequence compared with preset temperature with can be exchanged.
S3: detect liquid level L and preset liquid level L with second
2relatively, detected temperatures T also compares with the second preset temperature T2;
When detected temperatures T is more than or equal to the second preset temperature T
2and detect liquid level L and be more than or equal to the second default liquid level L
2time, enter next step;
Temperature and liquid level are detected jointly, when detected temperatures T is more than or equal to the second preset temperature T
2time, guarantee that the refrigerant in the liquid in oil return apparatus 1 is gasified totally, the liquid in oil return apparatus 1 is refrigeration oil; Detect liquid level L and be more than or equal to the second default liquid level L
2time, ensure that the storage capacity of the refrigeration oil in oil return apparatus 1 reaches certain value, carry out next step.
S4: close inlet 14, the oil return opening 13 opening oil return apparatus 1 carries out oil return, enters step S2.
The refrigeration system method for controlling oil return that the embodiment of the present invention provides, arranges first and presets liquid level L
1and preset temperature, and by feed liquor and heating operation, make the fluid temperature in oil return apparatus 1 be more than or equal to preset temperature, detect the liquid level drawn and be more than or equal to the first default liquid level L
1, guarantee that the refrigerant in liquid volatilizees completely and has a certain amount of refrigeration oil in oil return apparatus, carry out oil return.By oil return, the liquid level in oil return apparatus 1 is declined, and repeat feed liquor, oil return operation cycle is run.Provided by the inventionly have control method, by the temperature in oil return apparatus 1 and liquid automatic control oil return, oil return operation can be carried out timely to system, avoid the situation because cold oil in refrigeration pipe too much makes heat exchange efficiency reduce, and, effectively avoid system petrol starvation, reduce component wear situation, improve service life.
It should be noted that; above-mentioned refrigeration system method for controlling oil return is carry out when refrigeration plant runs; the operation of refrigeration plant operation can be carried out before step S1; also can carry out the operation of refrigeration plant operation between step S1 and step S2, tiredly no longer one by one state and all within protection domain at this.
Preferably, inlet 14 is preferably synchronous unlatching with gas returning port 15.
Further, also comprise in step S1: arrange the 3rd and preset liquid level L
3, the 3rd presets liquid level L
3be greater than second and preset liquid level L
2; The detection of step S2 is also compared liquid level and is specially, and the liquid level detected in oil return apparatus 1 also presets liquid level L with first
1compare, preset liquid level L when detection liquid level L is less than first
1time, open gas returning port 15 and inlet 14 feed liquor of oil return apparatus 1, until the liquid level in oil return apparatus 1 arrives the 3rd preset liquid level L
3time, close gas returning port 15 and inlet 14, enter next step.
Liquid level L is preset by arranging the 3rd
3, preset liquid level L when oil return apparatus 1 reaches the 3rd by feed liquor
3time, stop feed liquor, carry out next step, effectively prevent and affect heating effect because of hyperposia.
Also the feed liquor time can be set, preset liquid level L when detection liquid level L is less than first
1time, open inlet 14 feed liquor, by closing inlet 14 after one feed liquor period.
The detection of step S2 is also compared liquid level and is also comprised: preset liquid level L when detection liquid level L is more than or equal to first
1time, without the need to feed liquor, directly enter next step operation.
The detection of step S2 C.T also comprise: when detected temperatures T is more than or equal to preset temperature, meets the condition of volatilizing that is gasified totally of refrigerant in the mixing material of refrigeration oil and refrigerant, without the need to heating liquid, directly enter next step.
By the detection of step S2 and the heating operation of C.T, the refrigerant volatilization in liquid is also discharged by gas returning port 15, and liquid level is declined.In order to ensure the recirculating oil quantity in oil return process, step S3 also comprises: preset liquid level L when detection liquid level L is less than first
1time, open gas returning port 15 and inlet 14 feed liquor, enter the detection of step S2 and C.T.
When opening inlet 14 feed liquor in step S3, gas returning port 15 is opened.By inlet 14 feed liquor, the gas in oil return apparatus 1 is discharged by gas returning port 15, facilitate feed liquor operation.It should be noted that, inlet 14 is preferably synchronous unlatching with gas returning port 15.
Affect heating effect in order to avoid hyperposia, also comprise in step S1 and the 3rd default liquid level L is set
3, the 3rd presets liquid level L
3be greater than second and preset liquid level L
2; In step S4, preset liquid level L when detection liquid level L is less than first
1time, open inlet 14 feed liquor, until the liquid level in oil return apparatus 1 arrives the 3rd preset liquid level L
3time, close inlet 14, enter the detection of step S2 and C.T.
Also the feed liquor time can be set, preset liquid level L when detection liquid level L is less than first
1time, open inlet 14 feed liquor, by closing inlet 14 after one feed liquor period.
Step S3 also comprises: when detected temperatures T is less than the second preset temperature T
2time, start heating.Volatilize because heating makes refrigerant absorb heat, reduce the temperature in oil return apparatus 1; In step S4 again detected temperatures T, when detected temperatures T is less than preset temperature, opens heater 2 and heat, until the temperature in oil return apparatus 1 is more than or equal to preset temperature.
Step S5 is specially: keep inlet 14 and gas returning port 15 to close, open the oil return opening 13 of oil return apparatus 1 and the pressurization mouth 12 of oil return apparatus 1, carry out oil return, enter step S2.In oil return process, detected temperatures T be more than or equal to preset temperature and detect liquid level L be more than or equal to first preset liquid level L
1, along with the increase of recirculating oil quantity, liquid level declines, and repeats step S2, when recirculating oil quantity acquires a certain degree, detects liquid level L and is less than the first default liquid level L
1, open inlet 14 feed liquor.Wherein, oil return operation can be complete oil return, enter step S2 again after being discharged completely by complete oil return opening 13 by the refrigeration oil in oil return apparatus 1, oil return liquid level or oil return time also can be set, after a part for the refrigeration oil in oil return apparatus 1 is discharged by oil return opening 13, enter step S2.
It should be noted that the inlet 14 of oil return apparatus 1, gas returning port 15, oil return opening 13 and pressurization mouth 12 are provided with magnetic valve 3, reached the switch controlling corresponding inlet 14, gas returning port 15, oil return opening 13 or pressurization mouth 12 by the switch of Controlling solenoid valve 3.Pressurization mouth 12 is connected with the gas exhaust piping of compressor, gas returning port 15 is connected with the suction line of compressor, junction is as far as possible near compressor air suction mouth, oil return opening 13 is connected with the suction line of compressor, junction is as far as possible near compressor air suction mouth, and inlet 14 is communicated with evaporimeter or gas-liquid separator.
In the present embodiment, inlet 14, gas returning port 15 are communicated with the top of the inner chamber 11 of oil return apparatus 1 with pressurization mouth 12, and oil return opening 13 is communicated with the bottom of inner chamber 11.
In order to avoid over-heating, the detection of S2 C.T also comprise: when detected temperatures T be more than or equal to second state preset temperature time, stop heating.
Comprising the liquid level gauge 4 for exporting liquid level numerical value and the liquid-level switch 5 for exporting liquid level signal for level gauging in the present embodiment, also can an intelligent liquid level sensor being only set, directly will detect signal transmission that liquid level L generates to controller 7.Controller 7 and temperature measuring equipment 6, liquid-level switch 5, heater 2 and the multiple magnetic valves 3 controlling inlet 14, gas returning port 15, oil return opening 13 and the mouth 12 that pressurizes respectively are connected, and arrange first and preset liquid level L in controller 7
1, second preset liquid level L2 and preset temperature.In the present embodiment, heater 2 is electric heater.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a refrigeration system method for controlling oil return, is characterized in that, comprises step:
1) set first and preset liquid level, the second default liquid level and the first preset temperature and the second preset temperature, described second presets liquid level presets liquid level higher than first, and described second preset temperature is higher than the first preset temperature;
2) detect the liquid level in oil return apparatus and compare with described first predeterminated position, when detecting liquid level and being less than the described first default liquid level, opening gas returning port and the inlet of described oil return apparatus;
Detect the fluid temperature of oil return apparatus inside and compare with described first preset temperature, when detected temperatures is less than described first preset temperature, starts to heat and open the gas returning port of described oil return apparatus;
3) detected temperatures and liquid level, when detected temperatures be more than or equal to described second preset temperature and detect liquid level be more than or equal to described second preset liquid level time, enter next step;
4) close described inlet, the oil return opening opening described oil return apparatus carries out oil return, when described detection liquid level is lower than described first predeterminated position, enters step 2).
2. refrigeration system method for controlling oil return as claimed in claim 1, is characterized in that, also comprises and arrange the 3rd default liquid level in described step 1), and the described 3rd presets liquid level is more than or equal to the described second default liquid level;
Described step 2) be specially, detect the liquid level in oil return apparatus and compare with described first predeterminated position, when detecting liquid level and being less than the described first default liquid level, open gas returning port and the inlet feed liquor of described oil return apparatus, until when the liquid level in described oil return apparatus arrives the described 3rd default liquid level, close described gas returning port and described inlet.
3. refrigeration system method for controlling oil return as claimed in claim 2, is characterized in that, described step 2) also comprise: when described detection liquid level is more than or equal to the described first default liquid level, enter next step.
4. refrigeration system method for controlling oil return as claimed in claim 1, is characterized in that, described step 2) also comprise: when described detected temperatures is more than or equal to described first preset temperature, enter next step.
5. refrigeration system method for controlling oil return as claimed in claim 1, it is characterized in that, described step 3) also comprises: when described detection liquid level is less than the described first default liquid level, opens described gas returning port and described inlet feed liquor, enter described step 2).
6. refrigeration system method for controlling oil return as claimed in claim 5, is characterized in that,
In described step 3), when described detection liquid level is less than the described first default liquid level, open described inlet feed liquor, until when the liquid level in described oil return apparatus arrives the described second default liquid level, close described inlet, enter described step 2).
7. refrigeration system method for controlling oil return as claimed in claim 1, it is characterized in that, described step 3) also comprises: when described detected temperatures is less than described second preset temperature, starts heating.
8. refrigeration system method for controlling oil return as claimed in claim 1, it is characterized in that, described step 4) is specially: keep described inlet and described gas returning port to close, and opens the oil return opening of described oil return apparatus and the pressurization mouth of described oil return apparatus, carry out oil return, enter step 2).
9. refrigeration system method for controlling oil return as claimed in claim 1, is characterized in that, described step 2) also comprise: when described detected temperatures arrival institute second states preset temperature, stop heating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310380331.8A CN104422217B (en) | 2013-08-27 | 2013-08-27 | oil return control method for refrigeration system |
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|---|---|---|---|
| CN201310380331.8A CN104422217B (en) | 2013-08-27 | 2013-08-27 | oil return control method for refrigeration system |
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| CN104422217B CN104422217B (en) | 2016-10-05 |
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| CN111947354A (en) * | 2020-09-02 | 2020-11-17 | 珠海格力电器股份有限公司 | Oil separator, control method thereof and air conditioning unit |
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