CN101893343B - Multi-element mixed working medium throttling refrigerator with deeply separated refrigerant and lubricating oil - Google Patents
Multi-element mixed working medium throttling refrigerator with deeply separated refrigerant and lubricating oil Download PDFInfo
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- CN101893343B CN101893343B CN2010102181075A CN201010218107A CN101893343B CN 101893343 B CN101893343 B CN 101893343B CN 2010102181075 A CN2010102181075 A CN 2010102181075A CN 201010218107 A CN201010218107 A CN 201010218107A CN 101893343 B CN101893343 B CN 101893343B
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- 239000010687 lubricating oil Substances 0.000 title claims abstract description 56
- 239000010726 refrigerant oil Substances 0.000 title abstract 2
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000005057 refrigeration Methods 0.000 claims abstract description 23
- 239000003921 oil Substances 0.000 claims abstract description 17
- 239000003507 refrigerant Substances 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 239000012071 phase Substances 0.000 claims abstract description 7
- 238000010992 reflux Methods 0.000 claims abstract description 7
- 239000007791 liquid phase Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 31
- 230000006835 compression Effects 0.000 claims description 22
- 238000007906 compression Methods 0.000 claims description 22
- 230000008676 import Effects 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 238000009835 boiling Methods 0.000 description 19
- 239000000470 constituent Substances 0.000 description 18
- 238000007599 discharging Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010725 compressor oil Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention relates to a multi-element mixed working medium throttling refrigerator with deeply separated refrigerant and lubricating oil, which comprises: a lubricating oil compressor, an oil separator, a cooling heat exchanger, a gas-liquid separator, a counter-flow heat exchanger, a throttle valve and an evaporator which are sequentially connected and form a refrigeration cycle loop; the device is characterized by also comprising a thermal separator; the heat separator is communicated with a liquid phase outlet at the bottom of the gas-liquid separator; the lower part of the thermal separator is communicated with an exhaust split-flow point A of the compressor; the middle part of the thermal separator is communicated with an exhaust reflux point B of the compressor; the outlet at the top of the thermal separator is communicated with the gas-phase area at the top of the gas-liquid separator; the bottom of the heat separator is communicated with a low-pressure oil return pipeline of the lubricating oil compressor through a capillary tube. The method is simple and reliable, is easy to operate and control, and can realize the separation of the lubricating oil and the high-boiling-point component refrigerant without additional energy; meanwhile, the lubricating oil can be prevented from being brought into a low-temperature circulating part of the system, so that the pipeline resistance is increased, the heat exchange is deteriorated and the like.
Description
Technical field
The present invention relates to the polybasic mixture throttling circulating refrigerating device in the refrigeration low-temperature field, the polybasic mixture throttling refrigerating machine that particularly a kind of cold-producing medium separates with the lubricating oil degree of depth.
Background technology
The multicomponent mixture working medium j-t refrigerator is because its particular performances, becomes low temperature field (80K) from liquid nitrogen temperature until single-stage steam compression cycle cryogenic temperature scope (230K)---a good low-temperature receiver of this wide warm area.This kind cold-producing medium sharpest edges just have been to use the general cold single-stage oil lubricating compressor that reliability is high, efficient is high.Through the development and the application of many decades, general cold single-stage oil lubricating compressor is ripe, and its cost descends owing to the increase of output greatly.The development that this has also promoted to use the deep cooling mixture throttling refrigerating machine of this type of compressor has greatly improved its reliability and has reduced cost.Yet use oil lubricating compressor also to bring new problem, one of them major issue is exactly the separation and the oil return of compressor lubricant oil.Because the freezing point of lubricating oil is generally higher, its problem of at first bringing be exactly under the low temperature solid phase separate out, cause the obstruction of refrigeration machine throttling passage, directly make the refrigeration machine can't operate as normal.Lubricating oil gets into the low temperature part and also can cause the deterioration of heat transfer and the increase of flow resistance or the like problem in addition.
Present all kinds of mixed working substance copious cooling throttle refrigeration machine has all taked variety of way to be lubricated the separation of oil.The mixed work medium for throttling refrigeration system of automatic cascade form (Auto-cascade) for example; Rely on the equilibrium flash separator that different temperatures is provided with, can realize that higher boiling constituent element cold-producing medium comes out with lubricating oil separation in the multicomponent mixture work medium (specifically like US3698202 and US3768273); The kind of refrigeration cycle (ZL00136709.9) that also has the fractional condensation separate mode that the applicant once proposed in addition can also the recovery section cold in comparatively effective lubricant removal.Patent ZL02110664.9 has proposed to adopt the kind of refrigeration cycle of rectifying separation in addition, or the like.Technique scheme can solve lubricating oil and get into system's minimum warm area formation solid obstruction refrigeration machine problem, realizes that refrigeration system safely and steadily runs.Be that master's cryogenic refrigeration technology is applied in the middle of the low temperature refrigerator with patent ZL00136709.9 for example, the successful operation of device the earliest surpasses the time in 10 years.
All there is a common feature in above-mentioned separating cycle technology, and the mixing material throttling (generally also will after cold) that promptly all will separate back higher boiling working medium and lubricating oil gets into back stage countercurrent heat exchanger relevant position, reclaims wherein higher boiling refrigerating capacity.This kind mode still can be brought following problem in the middle of concrete the application:
First: lubricating oil and higher boiling constituent element still get into the heat exchanger lower temperature region, because viscosity is big under the lubricating oil low temperature, cause refrigeration system low-pressure side flow resistance to increase; Simultaneously because lubricating oil attached to the heat exchanger wall, causes heat transfer coefficient to descend.
Second: return the heat exchanger site after the mixture throttling of higher boiling constituent element constituent element cold-producing medium and lubricating oil and be difficult to obtain optimal result; In the different operation phase of system; The Temperature Distribution of heat exchanger is inconsistent, and especially under the only cold situation, its site of returning the low-pressure side flow process of main refrigeration system is difficult to appropriately the mixture of higher boiling constituent element cold-producing medium and lubricating oil before throttling; Be not easy to find the optimum position point, be easy to upset the normal temperature distribution of the circulatory system.
The 3rd: in real process, because restricting element (normally capillary) throttling characteristic is difficult to accurately confirm, the amount that causes isolating higher boiling constituent element cold-producing medium is wayward.
Summary of the invention
The purpose of this invention is to provide a kind of compressor air-discharging high temperature that utilizes and realize the polybasic mixture throttling refrigerating machine that higher boiling constituent element cold-producing medium separates with the lubricating oil degree of depth; This refrigeration machine utilizes the lubricating oil that the heat separator of compressor high-temperature exhaust air tells and the mixture of higher boiling constituent element cold-producing medium; Again get into kind of refrigeration cycle after making the higher boiling constituent element cold-producing medium evaporation in the mixture; And lubricating oil is separated and returns the compressor low-pressure side; Reaching separating of lubricating oil and higher boiling constituent element cold-producing medium, thereby overcome above-mentioned many defectives of polybasic mixture throttling circularly cooling machine.
Technical scheme of the present invention is following:
The polybasic mixture throttling refrigerating machine that cold-producing medium provided by the invention separates with the lubricating oil degree of depth; As shown in Figure 1, it comprises: the lubricating oil compression machine 1, oil eliminator 2, cooling heat exchanger 3, gas-liquid separator 4, contra-flow heat exchanger 5, choke valve 6 and the evaporimeter 7 that link to each other successively; Reach said evaporimeter (7) output and connect said contra-flow heat exchanger (5) input, said contra-flow heat exchanger (5) output connects said lubricating oil compression machine (1) low-pressure inlet, to form refrigeration cycle; It is characterized in that, also comprise heat separator 8;
Said heat separator 8 is connected with the bottom liquid phases outlet of said gas-liquid separator 4;
Said heat separator 8 bottoms are connected with the bypassing exhaust point A of lubricating oil compression machine 1; Any place of bypassing exhaust point A on connecting line between said oil eliminator 2 and the cooling heat exchanger 3 of said lubricating oil compression machine 1;
Said heat separator 8 middle parts are connected with the exhaust refluxing point B of cooling heat exchanger 3; The exhaust refluxing point B of said cooling heat exchanger 3 is on the refrigerant inlet and the heat exchange element between the refrigerant outlet of said cooling heat exchanger 3;
Said heat separator 8 top exits are connected with said gas-liquid separator 4 top gas phase zone;
Said heat separator 8 bottoms are connected through the low pressure return line of a capillary with said lubricating oil compression machine.
Described gas-liquid separator 4 is equilibrium flash separator, fractional condensation separator or rectifying separation device.
The structural representation of the polybasic mixture throttling refrigerating machine that Fig. 1 separates with the lubricating oil degree of depth for cold-producing medium of the present invention; It also is its kind of refrigeration cycle flow chart; Can know by Fig. 1; The improvements of the polybasic mixture throttling circularly cooling machine of cold-producing medium of the present invention and lubricating oil separation are: the liquid mixture that contains lubricating oil and higher boiling constituent element cold-producing medium that gas-liquid separator 4 outlet at bottoms are separated imports heat separator 8; In heat separator 8, utilize the high-temperature exhaust air that distributes from compressor air-discharging split point A that liquid mixture is heated; Higher boiling constituent element cold-producing medium evaporation back in the liquid mixture imports gas-liquid separator 4 top gas phase zone, gets into kind of refrigeration cycle again; And lubricating oil gets into the low pressure return line of lubricating oil compression machine 1 through the capillary that connects; The high-temperature exhaust air of the machine 1 of lubricating oil compression simultaneously is through being back to the compressor air-discharging backflow point B in the cooling heat exchanger 3 behind the heat separator 8.
The present invention is owing to utilized the high-temperature exhaust air of lubricating oil compression machine that the liquid phase mixture that contains lubricating oil and higher boiling constituent element cold-producing medium after separating is heated; Higher boiling constituent element cold-producing medium in the liquid phase mixture carries out the degree of depth with lubricating oil to be separated; The low temperature that can avoid lubricating oil to be brought into system on the one hand partly causes adverse consequences, and for example the lubricating oil viscosity increase causes degradation under increase of refrigeration system low-pressure side flow resistance and the heat exchange effect; Also reduced influence on the other hand, guaranteed higher boiling constituent element refrigerant concentration in the circulation mixed working fluid, made it more approach the working medium concentration of optimizing cycle fluid (higher boiling constituent element cold-producing medium) change in concentration; This device also has simple and reliable for structure, is easy to control, and need not advantages such as the other energy.
Description of drawings
The structural representation of the polybasic mixture throttling refrigerating machine that Fig. 1 separates with the lubricating oil degree of depth for cold-producing medium of the present invention also is its kind of refrigeration cycle flow chart.
The specific embodiment
As shown in Figure 1, the structure of traditional polybasic mixture throttling circularly cooling machine is: it comprises: the lubricating oil compression machine 1, oil eliminator 2, cooling heat exchanger 3, gas-liquid separator 4, contra-flow heat exchanger 5, choke valve 6 and the evaporimeter 7 that link to each other successively; Reach said evaporimeter (7) output and connect said contra-flow heat exchanger (5) input, said contra-flow heat exchanger (5) output connects said lubricating oil compression machine (1) low-pressure inlet, to form refrigeration cycle; The present invention is the improvement of on the basis of traditional polybasic mixture throttling circularly cooling machine, doing: promptly increased heat separator 8;
This heat separator 8 is connected with the bottom liquid phases outlet of said gas-liquid separator 4;
These heat separator 8 bottoms are connected with the bypassing exhaust point A of lubricating oil compression machine 1; Any place of bypassing exhaust point A on connecting line between said oil eliminator 2 and the cooling heat exchanger 3 of said lubricating oil compression machine 1;
These heat separator 8 middle parts are connected with the exhaust refluxing point B of cooling heat exchanger 3; The exhaust refluxing point B of said cooling heat exchanger 3 is on the refrigerant inlet and the heat exchange element between the refrigerant outlet of said cooling heat exchanger 3;
These heat separator 8 top exits are connected with said gas-liquid separator 4 top gas phase zone;
These heat separator 8 bottoms are connected through the low pressure return line of a capillary with said lubricating oil compression machine.
Its workflow is following:
The multicomponent mixture work medium cold-producing medium becomes high temperature and high pressure gas after compression at oil lubricating compressor 1; Get into oil eliminator 2; The lubricated compressor oil return section of getting back to of isolated major part; And the multicomponent mixture work medium cold-producing medium that contains less amount of lubrication oil gets into cooling heat exchanger 3, is cooled to environment temperature, gets into separator 4 and separates.The liquid mixture that contains lubricating oil and higher boiling constituent element cold-producing medium that separator 4 outlet at bottoms are separated imports heat separator 8; In heat separator 8, utilize the high-temperature exhaust air that distributes from compressor air-discharging split point A that liquid mixture is heated; Higher boiling constituent element cold-producing medium evaporation back in the liquid mixture imports gas-liquid separator 4 top gas phase zone, gets into kind of refrigeration cycle again; And lubricating oil gets into the low pressure return line of lubricating oil compression machine 1 through the capillary that connects; The high-temperature exhaust air of the machine 1 of lubricating oil compression simultaneously is through being back to the compressor air-discharging backflow point B in the cooling heat exchanger 3 behind the heat separator 8.Separator 4 top multicomponent mixture work medium cold-producing mediums get into contra-flow heat exchanger 5 and further are cooled; Get into choke valve 6 at last, pressure, temperature are reduced to minimumly after the throttling, get into and to get into contra-flow heat exchanger 5 after evaporimeter 7 provides cold; Cooling high pressure incoming flow working medium; Self temperature raises, and gets into compressor 1 low-pressure inlet, accomplishes a circulation thus.
Claims (2)
1. polybasic mixture throttling refrigerating machine that cold-producing medium separates with the lubricating oil degree of depth, it comprises: the lubricating oil compression machine (1), oil eliminator (2), cooling heat exchanger (3), gas-liquid separator (4), contra-flow heat exchanger (5), choke valve (6) and the evaporimeter (7) that link to each other successively; And said evaporimeter (7) output connects said contra-flow heat exchanger (5) and imports out end, and said contra-flow heat exchanger (5) output connects said lubricating oil compression machine (1) low-pressure inlet, to form refrigeration cycle; It is characterized in that, also comprise heat separator (8);
Said heat separator (8) is connected with the bottom liquid phases outlet of said gas-liquid separator (4);
Said heat separator (8) bottom is connected with the bypassing exhaust point (A) of lubricating oil compression machine (1); The bypassing exhaust point (A) of said lubricating oil compression machine (1) is positioned at any place on the connecting line between said oil eliminator (2) and the cooling heat exchanger (3);
Said heat separator (8) middle part is connected with the exhaust refluxing point (B) of cooling heat exchanger (3); The exhaust refluxing point (B) of said cooling heat exchanger (3) is positioned on the refrigerant inlet and the heat exchange element between the refrigerant outlet of said cooling heat exchanger (3);
Said heat separator (8) top exit is connected with said gas-liquid separator (4) top gas phase zone;
Said heat separator (8) bottom is connected through the low pressure return line of a capillary with said lubricating oil compression machine.
2. the polybasic mixture throttling refrigerating machine that separates with the lubricating oil degree of depth by the described cold-producing medium of claim 1 is characterized in that, described gas-liquid separator (4) is equilibrium flash separator, fractional condensation separator or rectifying separation device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102181075A CN101893343B (en) | 2010-06-24 | 2010-06-24 | Multi-element mixed working medium throttling refrigerator with deeply separated refrigerant and lubricating oil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102181075A CN101893343B (en) | 2010-06-24 | 2010-06-24 | Multi-element mixed working medium throttling refrigerator with deeply separated refrigerant and lubricating oil |
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| CN101893343A CN101893343A (en) | 2010-11-24 |
| CN101893343B true CN101893343B (en) | 2012-08-15 |
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| CN103727004B (en) * | 2014-01-17 | 2016-01-20 | 吉首大学 | Lubricant oil automatic drying vacuum pump |
| CN105299957B (en) * | 2015-10-19 | 2018-05-22 | 中国科学院理化技术研究所 | Lubricating oil circulation system of multi-component mixed working medium oil lubrication compressor unit |
| CN107062679A (en) * | 2017-04-27 | 2017-08-18 | 广东美的制冷设备有限公司 | Air-conditioning system and its control method |
| CN107152808A (en) * | 2017-06-28 | 2017-09-12 | 中山阿瑞德电器设备有限公司 | A kind of circulating with choke cryogenic refrigeration system of multicomponent mixture work medium |
| CN108716793B (en) * | 2018-06-27 | 2023-09-08 | 佛山市德天电器有限公司 | Oil content device and heat pump system thereof |
| CN110006194A (en) * | 2019-04-09 | 2019-07-12 | 珠海格力电器股份有限公司 | Air conditioning system with oil reducing and liquid accumulation preventing functions and control method thereof |
| CN113669936A (en) * | 2021-07-06 | 2021-11-19 | 北京国家速滑馆经营有限责任公司 | Oil return system for carbon dioxide transcritical refrigeration system |
| CN113483448B (en) * | 2021-07-09 | 2022-10-28 | 青岛海尔空调器有限总公司 | Method for recovering oil stain in pipe of indoor unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3698202A (en) * | 1971-08-16 | 1972-10-17 | Gulf & Western Industries | Control system for low temperature refrigeration system |
| US3768273A (en) * | 1972-10-19 | 1973-10-30 | Gulf & Western Industries | Self-balancing low temperature refrigeration system |
| CN1361399A (en) * | 2000-12-28 | 2002-07-31 | 中国科学院低温技术实验中心 | Mixed work medium condensating, separating, throttling and deep cooling circular refrigeration system |
| CN1363815A (en) * | 2002-01-25 | 2002-08-14 | 浙江大学 | Deep refrigerating method and equipment |
-
2010
- 2010-06-24 CN CN2010102181075A patent/CN101893343B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3698202A (en) * | 1971-08-16 | 1972-10-17 | Gulf & Western Industries | Control system for low temperature refrigeration system |
| US3768273A (en) * | 1972-10-19 | 1973-10-30 | Gulf & Western Industries | Self-balancing low temperature refrigeration system |
| CN1361399A (en) * | 2000-12-28 | 2002-07-31 | 中国科学院低温技术实验中心 | Mixed work medium condensating, separating, throttling and deep cooling circular refrigeration system |
| CN1363815A (en) * | 2002-01-25 | 2002-08-14 | 浙江大学 | Deep refrigerating method and equipment |
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