CN104422217B - Refrigeration system method for controlling oil return - Google Patents
Refrigeration system method for controlling oil return Download PDFInfo
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- CN104422217B CN104422217B CN201310380331.8A CN201310380331A CN104422217B CN 104422217 B CN104422217 B CN 104422217B CN 201310380331 A CN201310380331 A CN 201310380331A CN 104422217 B CN104422217 B CN 104422217B
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- liquid level
- oil return
- preset
- temperature
- preset temperature
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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
Abstract
The invention discloses a kind of refrigeration system method for controlling oil return, including step: 1) arrange and first preset liquid level, second preset liquid level and the first preset temperature and the second preset temperature, second presets liquid level presets liquid level higher than first, and the second preset temperature is higher than the first preset temperature；2) detect the liquid level in oil return apparatus and compare with the first predeterminated position, when detection liquid level presets liquid level less than first, opening gas returning port and inlet；Detect the temperature of liquid within oil return apparatus and compare with the first preset temperature, when detection temperature is less than the first preset temperature, begins to warm up and open gas returning port；3) detection temperature more than or equal to the second preset temperature and detect liquid level more than or equal to second preset liquid level time, enter next step；4) close inlet, open oil return opening oil return, when detection liquid level is less than the first predeterminated position, enter step 2).Present invention, avoiding system petrol starvation, reduce component wear situation, improve service life.
Description
Technical field
The present invention relates to technical field of refrigeration equipment, particularly to a kind of refrigeration system method for controlling oil return.
Background technology
In refrigeration systems, it is required for separating coolant and refrigeration oil, although machine is assembled with coolant and oil
Device for effectively separating, also cannot ensure being kept completely separate of coolant and refrigeration oil, and a small amount of refrigeration oil can be by a high speed
The dirts such as coolant is brought into refrigeration piping and heat transmission equipment from refrigeration compressor oil system, oil film are attached to change
On heat pipe, the heat transfer effect of equipment can be reduced；Further, a large amount of losses of refrigeration oil can cause internal system
Part cannot normally lubricate, as affected the normal operation of compressor.
Therefore, oil return apparatus is set in system, makes coolant enter oil return apparatus with the mixed liquor of refrigeration oil
After being heated separate, coolant gasification after by oil return apparatus oil return opening enter compressor, remaining refrigeration oil by
The oil return opening of oil return apparatus enters the return line of compressor.
But, the oil return operation of oil return apparatus completes for manual operation, easily causes not in time because of oil return
In oil return apparatus, refrigeration oil is too much or in refrigeration piping refrigeration oil too much, cause the phenomenon of system oil starvation, make
Become parts heavy wears because of oil starvation, even compressor damage such as compressor, affect service life；And make
In cold pipeline, refrigeration oil is too much, can make the heat transfer effect of reduction equipment.
Therefore, oil return the most in time, it is to avoid heat exchange efficiency reduces and improves service life, it has also become ability
Field technique personnel'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, in order to oil return in time,
Avoid heat exchange efficiency reduce and improve service life.
For achieving the above object, the present invention provides following technical scheme:
A kind of refrigeration system method for controlling oil return, including step:
1) arrange and first preset liquid level, second preset 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 detection liquid level
When presetting liquid level less than described first, open gas returning port and the inlet of described oil return apparatus；
Detect the temperature of liquid within oil return apparatus and compare with described first preset temperature, working as detection
When temperature is less than described first preset temperature, begin to warm up and open the gas returning port of described oil return apparatus；
3) detection temperature and liquid level, when detection temperature more than or equal to described second preset temperature and detects
When liquid level presets liquid level more than or equal to described second, enter next step；
4) closing described inlet, the oil return opening opening described oil return apparatus carries out oil return, when described detection
When liquid level is less than described first predeterminated position, enter step 2).
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 1) also includes arrange the 3rd
Presetting liquid level, the described 3rd presets liquid level presets liquid level more than or equal to described second；
Described step 2) specifically, detection oil return apparatus in liquid level and carry out with described first predeterminated position
Relatively, when detecting liquid level and presetting liquid level less than described first, open described oil return apparatus gas returning port and
Inlet feed liquor, during until liquid level is preset in the liquid level arrival the described 3rd in described oil return apparatus, closes institute
State gas returning port and described inlet.
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 2) also include: when described inspection
When survey liquid level presets liquid level more than or equal to described first, enter next step.
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 2) also include: when described inspection
When testing temperature 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 includes: when described inspection
When survey liquid level presets liquid level less than described first, open 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
When liquid level is preset less than described first in position, open described inlet feed liquor, until in described oil return apparatus
When liquid level is preset in liquid level arrival described second, close described inlet, enter described step 2).
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 3) also includes: when described inspection
When testing temperature is less than described second preset temperature, begin to warm up.
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 4) is particularly as follows: keep described
Inlet is closed with described gas returning port, opens the oil return opening of described oil return apparatus and adding of described oil return apparatus
Pressure mouth, carries out oil return, enters step 2).
Preferably, in above-mentioned refrigeration system method for controlling oil return, described step 2) also include: when described inspection
When preset temperature is stated in testing temperature arrival second, stop heating.
From above-mentioned technical scheme it can be seen that the present invention provide refrigeration system method for controlling oil return, if
Put first and preset liquid level and preset temperature, and by feed liquor and heating operation, make the liquid in oil return apparatus
Temperature is more than or equal to preset temperature, and the liquid level that detection draws presets liquid level more than or equal to first,
Guarantee that the coolant in liquid volatilizees completely and has a certain amount of refrigeration oil in oil return apparatus, carry out oil return.
Make the liquid level in oil return apparatus decline by oil return, and repeat feed liquor so that oil return operation circular flow.
What the present invention provided has control method, by the temperature in oil return apparatus and liquid automatic control oil return,
Timely system can be carried out oil return operation, it is to avoid because in refrigeration pipe, cooling oil too much makes heat exchange
The situation that efficiency reduces, and, effectively avoid system petrol starvation, reduce component wear situation,
Improve service life.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing 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, in order to oil return in time, it is to avoid change
The thermal efficiency reduces and improves service life.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
Refer to the refrigeration system method for controlling oil return that Fig. 1 and Fig. 2, Fig. 1 provide for the embodiment of the present invention
FB(flow block)；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, including step:
S1: set preset value, sets first and presets liquid level L1, second preset liquid level L2And first preset temperature
Degree T1With the second preset temperature T2, wherein, second presets liquid level L2Liquid level L is preset higher than first1, the
Two preset temperature T2Higher than the first preset temperature T1；
Arrange first and preset liquid level L1And second preset liquid level L2, when the liquid of the refrigeration oil in oil return apparatus 1
When position is more than or equal to the second predeterminated position, meet the restriction bar to liquid level when oil return apparatus 1 oil return operates
Part, and control liquid level after oil return and preset liquid level L less than first1；First preset temperature T is set1And second is pre-
If temperature T2, when the temperature of the liquid in oil return apparatus 1 is more than or equal to the first preset temperature T1Time meet
Refrigeration oil and the condition of the volatilization that is gasified totally of coolant in the mixing liquid of coolant, and in order to avoid repeatedly adding
Heat, due to the second preset temperature T2Higher than the first preset temperature T1, will liquid temperature in oil return apparatus 1
Degree controls more than or equal to the second preset temperature T2Regulation under oil return, the liquid in oil return apparatus 1
Temperature is by the second preset temperature T2Drop to the first preset temperature T1, continue heating.
S2: detect and compare liquid level, detects the liquid level in oil return apparatus 1 and presets liquid level L with first1Enter
Row compares, when detection liquid level L presets liquid level L less than first1Time, open the gas returning port 15 of oil return apparatus 1
And inlet 14 feed liquor,
Detection C.T, detect the temperature of liquid within oil return apparatus 1 and enter with described preset temperature
Row compares, when detection temperature T is less than the first preset temperature T1Time, begin to warm up and open oil return apparatus 1
Gas returning port 15 open；
A small amount of refrigeration oil is brought into refrigeration piping, opens oil return operation；In oil return apparatus 1 being detected
Refrigeration oil liquid level presets liquid level L less than first1Time, open gas returning port 15 and the inlet of oil return apparatus 1
14, make the mixing liquid of refrigeration oil and coolant enter in oil return apparatus 1, the gas in oil return apparatus 1 by
Gas returning port 15 is discharged.It should be noted that oil return opening 13 and heater 2 now are closed mode.
When detecting temperature T less than preset temperature, the mixing liquid heating to refrigeration oil with coolant, make cold
Matchmaker's endothermic gasification, is discharged by gas returning port 15, residue refrigeration oil in oil return apparatus 1, it is achieved refrigeration oil with
The separation of coolant.
Wherein, detect liquid level L and preset liquid level L with first1Relatively and detection temperature T and with the to preset
The operation order that temperature compares can be exchanged.
S3: detection liquid level L also presets liquid level L with second2Relatively, detect temperature T and preset temperature with second
Degree T2 compares；
When detection temperature T is more than or equal to the second preset temperature T2And detect liquid level L more than or equal to the
Two preset liquid level L2Time, enter next step；
Temperature and liquid level are detected jointly, when detection temperature T is more than or equal to the second preset temperature T2Time,
Guaranteeing that the coolant in the liquid in oil return apparatus 1 is gasified totally, the liquid in oil return apparatus 1 is refrigeration oil；
Detection liquid level L presets liquid level L more than or equal to second2Time, it is ensured that the refrigeration oil in oil return apparatus 1
Storage capacity reaches certain value, carries 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 L1And it is pre-
If temperature, and by feed liquor and heating operation, make the temperature of liquid in oil return apparatus 1 more than or equal to pre-
If temperature, the liquid level that detection draws presets liquid level L more than or equal to first1, it is ensured that cold in liquid
Matchmaker is volatilized completely and has a certain amount of refrigeration oil in oil return apparatus, carries out oil return.Oil return is made by oil return
Liquid level in device 1 declines, and repeats feed liquor so that oil return operation circular flow.The present invention provides
Have control method, by the temperature in oil return apparatus 1 and liquid automatic control oil return, can be timely
System carried out oil return operation, it is to avoid because in refrigeration pipe, cooling oil too much makes heat exchange efficiency reduce
Situation, and, effectively avoid system petrol starvation, reduce component wear situation, improve and make
Use the life-span.
It should be noted that above-mentioned refrigeration system method for controlling oil return is in the case of refrigeration plant runs
Carry out, the operation of refrigeration plant operation can be carried out before step S1, it is also possible to step S1 with
Carry out the operation of refrigeration plant operation between step S2, at this most tired state and all protection domain it
In.
Preferably, inlet 14 is the most synchronize with gas returning port 15 opens.
Further, step S1 also includes: arrange the 3rd and preset liquid level L3, the 3rd presets liquid level L3
Liquid level L is preset more than second2；The detection of step S2 also compares liquid level specifically, in detection oil return apparatus 1
Liquid level and preset liquid level L with first1Compare, when detection liquid level L presets liquid level L less than first1
Time, open gas returning port 15 and inlet 14 feed liquor of oil return apparatus 1, until the liquid in oil return apparatus 1
Position arrives the 3rd and presets liquid level L3Time, close gas returning port 15 and inlet 14, enter next step.
Liquid level L is preset by arranging the 3rd3, preset liquid level L when oil return apparatus 1 reaches the 3rd by feed liquor3
Time, stop feed liquor, carry out next step, effectively prevent and affect heats because of hyperposia.
The feed liquor time can also be set, when detection liquid level L presets liquid level L less than first1Time, open feed liquor
Mouth 14 feed liquors, by closing inlet 14 after one feed liquor period.
The detection of step S2 is also compared liquid level and is also included: when detection liquid level L presets liquid more than or equal to first
Position L1Time, it is not necessary to feed liquor, it is directly entered next step operation.
Detection the C.T of step S2 also include: when detecting temperature T more than or equal to preset temperature,
Meet refrigeration oil and the condition of the volatilization that is gasified totally of coolant in the mixing liquid of coolant, it is not necessary to liquid is added
Heat, is directly entered next step.
By detection the heating operation of C.T of step S2, the coolant in liquid volatilizees and by return-air
Mouth 15 is discharged so that liquid level declines.In order to ensure the recirculating oil quantity during oil return, step S3 also includes:
When detection liquid level L presets liquid level L less than first1Time, open gas returning port 15 and inlet 14 feed liquor, enter
Enter detection the C.T of step S2.
When opening inlet 14 feed liquor in step S3, gas returning port 15 is opened.By inlet 14 feed liquor,
Gas in oil return apparatus 1 is discharged by gas returning port 15, facilitates feed liquor operation.It should be noted that
Inlet 14 is the most synchronize with gas returning port 15 to be opened.
Affect heats in order to avoid hyperposia, step S1 also including, arranging the 3rd presets liquid level
L3, the 3rd presets liquid level L3Liquid level L is preset more than second2；In step S4, when detection liquid level L is less than
First presets liquid level L1Time, open inlet 14 feed liquor, until the liquid level in oil return apparatus 1 arrives the 3rd
Preset liquid level L3Time, close inlet 14, enter detection the C.T of step S2.
The feed liquor time can also be set, when detection liquid level L presets liquid level L less than first1Time, open feed liquor
Mouth 14 feed liquors, by closing inlet 14 after one feed liquor period.
Step S3 also includes: when detection temperature T is less than the second preset temperature T2Time, begin to warm up.By
Make coolant heat absorption volatilization in heating, reduce the temperature in oil return apparatus 1；Again temperature is detected in step S4
Degree T, when detecting temperature T less than preset temperature, opens heater 2 and heats, until oil return apparatus 1
Interior temperature is more than or equal to preset temperature.
Step S5, particularly as follows: keep inlet 14 to close with gas returning port 15, opens returning of oil return apparatus 1
The pressurization mouth 12 of hydraulic fluid port 13 and oil return apparatus 1, carries out oil return, enters step S2.During oil return,
Detection temperature T is more than or equal to preset temperature and detects liquid level L and presets liquid level L more than or equal to first1,
Along with the increase of recirculating oil quantity, liquid level declines, and repeats step S2, when recirculating oil quantity reaches to a certain degree, and inspection
Survey liquid level L and preset liquid level L less than first1, open inlet 14 feed liquor.Wherein, oil return operation can be
Completely oil return, will the refrigeration oil in oil return apparatus 1 be completely exhausted out by complete oil return opening 13 after enter back into step
Rapid S2, it is also possible to oil return liquid level or oil return time are set so that of the refrigeration oil in oil return apparatus 1
Divide and after being 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 electromagnetic valve 3, by control the switch of electromagnetic valve 3 reach to control corresponding inlet 14,
Gas returning port 15, oil return opening 13 or the switch of pressurization mouth 12.Pressurization mouth 12 connects with the gas exhaust piping of compressor
Connecing, gas returning port 15 is connected with the suction line of compressor, and junction, close proximity to compressor air suction mouth, is returned
Hydraulic fluid port 13 is connected with the suction line of compressor, and junction is close proximity to compressor air suction mouth, inlet 14
Connect with vaporizer or gas-liquid separator.
In the present embodiment, inlet 14, gas returning port 15 and pressurization mouth 12 and the inner chamber of oil return apparatus 1
The top connection of 11, oil return opening 13 connects with the bottom of inner chamber 11.
In order to avoid over-heating, detection the C.T of S2 also include: when detection temperature T more than or
When stating preset temperature equal to second, stop heating.
Be used for level gauging in the present embodiment includes the liquidometer 4 for exporting liquid level numerical value and for defeated
Go out the liquid-level switch 5 of liquid level signal, it is also possible to an intelligent liquid level sensor is only set, directly will detect liquid
The signal that position L generates passes to controller 7.Controller 7 and temperature measuring equipment 6, liquid-level switch 5, heating
Device 2 and respectively control inlet 14, gas returning port 15, oil return opening 13 and multiple electromagnetism of pressurization mouth 12
Valve 3 connects, and arranges first and preset liquid level L in controller 71, second preset liquid level L2 and preset temperature.
In the present embodiment, heater 2 is electric heater.
In this specification, each embodiment uses the mode gone forward one by one to describe, and each embodiment stresses
Being the difference with other embodiments, between each embodiment, identical similar portion sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (8)
1. a refrigeration system method for controlling oil return, it is characterised in that include step:
1) setting and first preset liquid level, second preset 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 presetting liquid level less than described first, opening gas returning port and the inlet of described oil return apparatus；
Detect the temperature of liquid within oil return apparatus and compare with described first preset temperature, when detecting temperature less than described first preset temperature, beginning to warm up and open the gas returning port of described oil return apparatus；
3) detection temperature and liquid level, when detect temperature more than or equal to described second preset temperature and detect liquid level preset liquid level more than or equal to described second time, enter next step；
4) closing described inlet, the oil return opening opening described oil return apparatus carries out oil return, when described detection liquid level is less than described first predeterminated position, enters step 2)；
Described step 1) in also include arranging the 3rd and preset liquid level, the described 3rd presets liquid level presets liquid level more than or equal to described second；
Described step 2) it is specially, detect the liquid level in oil return apparatus and compare with described first predeterminated position, when detecting liquid level and presetting liquid level less than described first, open gas returning port and the inlet feed liquor of described oil return apparatus, during until liquid level is preset in the liquid level arrival the described 3rd in described oil return apparatus, close described gas returning port and described inlet.
2. refrigeration system method for controlling oil return as claimed in claim 1, it is characterised in that described step 2) also include: when described detection liquid level presets liquid level more than or equal to described first, enter next step.
3. refrigeration system method for controlling oil return as claimed in claim 1, it is characterised in that described step 2) also include: when described detection temperature is more than or equal to described first preset temperature, enter next step.
4. refrigeration system method for controlling oil return as claimed in claim 1, it is characterised in that described step 3) also include: when described detection liquid level presets liquid level less than described first, enter described step 2).
5. refrigeration system method for controlling oil return as claimed in claim 4, it is characterised in that
Described step 3) in, when described detection liquid level presets liquid level less than described first, open described inlet feed liquor, during until liquid level is preset in the liquid level arrival described second in described oil return apparatus, close described inlet, enter described step 2).
6. refrigeration system method for controlling oil return as claimed in claim 1, it is characterised in that described step 3) also include: when described detection temperature is less than described second preset temperature, begin to warm up.
7. refrigeration system method for controlling oil return as claimed in claim 1, it is characterized in that, described step 4) particularly as follows: keep described inlet to close with described gas returning port, open 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).
8. refrigeration system method for controlling oil return as claimed in claim 1, it is characterised in that described step 2) also include: when described detection temperature arrives described second preset temperature, stop heating.
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| CN201310380331.8A CN104422217B (en) | 2013-08-27 | 2013-08-27 | Refrigeration system method for controlling oil return |
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| CN201310380331.8A CN104422217B (en) | 2013-08-27 | 2013-08-27 | Refrigeration system method for controlling oil return |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104949414B (en) * | 2015-07-10 | 2017-12-19 | 珠海格力电器股份有限公司 | The detection method and device of air conditioner and its compressor oil level |
| DE102017214941A1 (en) | 2017-08-25 | 2019-02-28 | Dometic Sweden Ab | Recreational vehicle, cooling device, control system and method of controlling the cooling device |
| US10941955B2 (en) | 2017-10-27 | 2021-03-09 | Dometic Sweden Ab | Systems, methods, and apparatuses for providing communications between climate control devices in a recreational vehicle |
| CN110960077B (en) * | 2018-09-30 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance and control method thereof |
| CN110131925A (en) * | 2019-05-16 | 2019-08-16 | 珠海格力电器股份有限公司 | Method for controlling oil return, compressor and the heat-exchange system of compressor |
| CN111947354B (en) * | 2020-09-02 | 2024-03-19 | 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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| JP3819672B2 (en) * | 2000-05-16 | 2006-09-13 | 三洋電機株式会社 | Oil level detection device and air conditioner for high pressure vessel |
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