CN101893343A - Polybasic mixture throttling refrigerating machine with deeply separated refrigerant and lubricating oil - Google Patents
Polybasic mixture throttling refrigerating machine with deeply separated refrigerant and lubricating oil Download PDFInfo
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- CN101893343A CN101893343A CN 201010218107 CN201010218107A CN101893343A CN 101893343 A CN101893343 A CN 101893343A CN 201010218107 CN201010218107 CN 201010218107 CN 201010218107 A CN201010218107 A CN 201010218107A CN 101893343 A CN101893343 A CN 101893343A
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Abstract
The invention relates to a polybasic mixture throttling refrigerating machine with deeply separated refrigerant and lubricating oil. The machine 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 connected in turn and form a refrigeration cycle loop. The machine is characterized by also comprising a thermal separator, wherein the thermal 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 diversion point A of the compressor; the middle part of the thermal separator is communicated with an exhaust refluxing point B of the compressor; the outlet on the top part of the thermal separator is communicated with a gas phase area on the top part of the gas-liquid separator; and the bottom part of the thermal separator is communicated with a low-pressure oil return pipeline of the lubricating oil compressor through a capillary. The machine has the characteristics of simplicity, reliability and easy control, can realize the separation of the lubricating oil from a high-boiling point component refrigerant without additional energy source, and simultaneously avoids pipeline resistance increment, heat exchange deterioration and the like caused by bringing the lubricating oil into a low-temperature cyclic part of a system.
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 reliability height, general cold single-stage oil lubricating compressor that 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 greatly owing to the increase of output.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 enters 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 as 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 the kind of refrigeration cycle that adopts rectifying to separate in addition, or the like.Technique scheme can solve lubricating oil and enter system's minimum warm area formation solid obstruction refrigeration machine problem, realizes that refrigeration system safely and steadily runs.For example be applied in the middle of the low temperature refrigerator based on the cryogenic refrigeration technology of patent ZL00136709.9, 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 enters stage countercurrent heat exchanger relevant position afterwards, 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 enter 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 heat exchanger position point 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, especially the mixture of higher boiling constituent element cold-producing medium and lubricating oil is before throttling under the only cold situation, its position point that returns the low-pressure side flow process of main refrigeration system is difficult to appropriately, 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 feature is difficult to accurately determine, 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 heated separator of compressor high-temperature exhaust air tells and the mixture of higher boiling constituent element cold-producing medium, reenter 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 as follows:
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: lubricating oil continuous successively and the formation refrigeration cycle compresses machine 1, oil eliminator 2, cooling heat exchanger 3, gas-liquid separator 4, contra-flow heat exchanger 5, choke valve 6 and evaporimeter 7; It is characterized in that, also comprise heat separator 8;
Described heat separator 8 is connected with the bottom liquid phases outlet of described gas-liquid separator 4;
Described 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 described oil eliminator 2 and the cooling heat exchanger 3 of described lubricating oil compression machine 1;
Described heat separator 8 middle parts are connected with the exhaust refluxing point B of lubricating oil compression machine 1; The exhaust refluxing point B of described lubricating oil compression machine 1 is on the refrigerant inlet and the heat exchange element between the refrigerant outlet of described cooling heat exchanger 3;
Described heat separator 8 top exits are connected with described gas-liquid separator 4 top gas phase zone;
Described heat separator 8 bottoms are connected by the low pressure return line of a capillary with described lubricating oil compression machine.
Described gas-liquid separator 4 is equilibrium flash separator, fractional condensation separator or rectifying separator.
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, as shown in Figure 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, enters kind of refrigeration cycle again; And the capillary of lubricating oil through connecting enters the low pressure return line of lubricating oil compression machine 1; 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 partly causes adverse consequences on the one hand, 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: lubricating oil continuous successively and the formation refrigeration cycle compresses machine 1, oil eliminator 2, cooling heat exchanger 3, gas-liquid separator 4, contra-flow heat exchanger 5, choke valve 6 and evaporimeter 7.The present invention is the improvement of doing on the basis of traditional polybasic mixture throttling circularly cooling machine: promptly increased heat separator 8;
This heat separator 8 is connected with the bottom liquid phases outlet of described 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 described oil eliminator 2 and the cooling heat exchanger 3 of described lubricating oil compression machine 1;
These heat separator 8 middle parts are connected with the exhaust refluxing point B of lubricating oil compression machine 1; The exhaust refluxing point B of described lubricating oil compression machine 1 is on the refrigerant inlet and the heat exchange element between the refrigerant outlet of described cooling heat exchanger 3;
These heat separator 8 top exits are connected with described gas-liquid separator 4 top gas phase zone;
These heat separator 8 bottoms are connected by the low pressure return line of a capillary with described lubricating oil compression machine.
Its workflow is as follows:
The multicomponent mixture work medium cold-producing medium becomes high temperature and high pressure gas after compression at oil lubricating compressor 1, enter 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 enters cooling heat exchanger 3, be cooled to environment temperature, enter separator 4 and separate.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, enters kind of refrigeration cycle again; And the capillary of lubricating oil through connecting enters the low pressure return line of lubricating oil compression machine 1; 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 enter contra-flow heat exchanger 5 and further are cooled, enter choke valve 6 at last, pressure, temperature are reduced to minimum after the throttling, enter and enter contra-flow heat exchanger 5 after evaporimeter 7 provides cold, cooling high pressure incoming flow working medium, self temperature raises, and enters compressor 1 low-pressure inlet, finishes 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:
Lubricating oil continuous successively and the formation refrigeration cycle compresses machine (1), oil eliminator (2), cooling heat exchanger (3), gas-liquid separator (4), contra-flow heat exchanger (5), choke valve (6) and evaporimeter (7);
It is characterized in that, also comprise heat separator (8);
Described heat separator (8) is connected with the bottom liquid phases outlet of described gas-liquid separator (4);
Described heat separator (8) bottom is connected with the bypassing exhaust point (A) of lubricating oil compression machine (1); The bypassing exhaust point (A) of described lubricating oil compression machine (1) is positioned at any place on the connecting line between described oil eliminator (2) and the cooling heat exchanger (3);
Described heat separator (8) middle part is connected with the exhaust refluxing point (B) of lubricating oil compression machine (1); The exhaust refluxing point (B) of described lubricating oil compression machine (1) is positioned on the refrigerant inlet and the heat exchange element between the refrigerant outlet of described cooling heat exchanger (3);
Described heat separator (8) top exit is connected with described gas-liquid separator 4 top gas phase zone;
Described heat separator (8) bottom is connected by the low pressure return line of a capillary with described 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 separator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102181075A CN101893343B (en) | 2010-06-24 | 2010-06-24 | Polybasic mixture throttling refrigerating machine with deeply separated refrigerant and lubricating oil |
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| CN2010102181075A CN101893343B (en) | 2010-06-24 | 2010-06-24 | Polybasic mixture throttling refrigerating machine with deeply separated refrigerant and lubricating oil |
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| CN101893343B CN101893343B (en) | 2012-08-15 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727004A (en) * | 2014-01-17 | 2014-04-16 | 吉首大学 | Automatic drying vacuum pump for lubricating oil |
| CN105299957A (en) * | 2015-10-19 | 2016-02-03 | 中国科学院理化技术研究所 | Lubricating oil circulation system of multi-component mixed refrigerant 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 |
| CN108716793A (en) * | 2018-06-27 | 2018-10-30 | 佛山市德天电器有限公司 | A kind of oil separation device and its heat pump system |
| CN110006194A (en) * | 2019-04-09 | 2019-07-12 | 珠海格力电器股份有限公司 | Air-conditioning system and its control method with drop oil temperature and anti-hydrops function |
| CN113483448A (en) * | 2021-07-09 | 2021-10-08 | 青岛海尔空调器有限总公司 | Method for recovering oil stain in pipe of indoor unit |
| 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 |
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| 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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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 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727004A (en) * | 2014-01-17 | 2014-04-16 | 吉首大学 | Automatic drying vacuum pump for lubricating oil |
| CN105299957A (en) * | 2015-10-19 | 2016-02-03 | 中国科学院理化技术研究所 | Lubricating oil circulation system of multi-component mixed refrigerant 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 |
| CN108716793A (en) * | 2018-06-27 | 2018-10-30 | 佛山市德天电器有限公司 | A kind of oil separation device and its heat pump system |
| 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 and its control method with drop oil temperature and anti-hydrops function |
| 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 |
| CN113483448A (en) * | 2021-07-09 | 2021-10-08 | 青岛海尔空调器有限总公司 | Method for recovering oil stain in pipe of indoor unit |
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| CN101893343B (en) | 2012-08-15 |
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