CN106766386A - Carbon dioxide cascade refrigeration system automatic oil-return device - Google Patents
Carbon dioxide cascade refrigeration system automatic oil-return device Download PDFInfo
- Publication number
- CN106766386A CN106766386A CN201710098605.2A CN201710098605A CN106766386A CN 106766386 A CN106766386 A CN 106766386A CN 201710098605 A CN201710098605 A CN 201710098605A CN 106766386 A CN106766386 A CN 106766386A
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- China
- Prior art keywords
- shell
- heat exchanger
- tube heat
- carbon dioxide
- interface
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
-
- 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
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/16—Lubrication
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
A kind of carbon dioxide cascade refrigeration system automatic oil-return device, including shell-and-tube heat exchanger, the regulating valve and magnetic valve being connected with shell-and-tube heat exchanger shell side middle part, the regulating valve and magnetic valve being connected with shell-and-tube heat exchanger shell side bottom, the pressure-difference valve being connected with shell-and-tube heat exchanger shell side top, be connected liquid level gauge and two liquid-level switches with shell-and-tube heat exchanger shell side.Whole oil return apparatus have 5 interfaces to be communicated with the outside：With condenser or liquid reservoir connected interface, and expansion valve connected interface, and carbon dioxide pump export pipeline connected interface, and circulation barrel connected interface, with compressor air suction mouthful connected interface.Refrigeration oil in being dissolved in carbon dioxide in low pressure recycle barrel can be purified out and return to compressor by the present invention automatically in refrigeration system running, improve the heat exchange efficiency of refrigeration plant, and do not lose the refrigerating capacity of refrigeration system in the course of the work, the operation of compressor is not influenceed, it is practical.
Description
Technical field
The present invention relates to a kind of refrigeration plant, particularly a kind of carbon dioxide cascade refrigeration system automatic oil-return device is used
Compressor is returned in the refrigeration oil for extracting refrigeration system low-pressure side and by its automatic transport.
Background technology
In recent years, the artificial synthesized refrigerant of freon class that people widely apply to refrigeration industry breaks to atmospheric ozone layer
The environmental problem such as bad effect and greenhouse effects is increasingly paid attention to, and related personnel is also in the replacement skill of actively research freon refrigerant
Art.Low ODP（Depletion of the ozone layer potential）With low GWP（Greenhouse effects potential）Environmental protection refrigerant be increasingly taken seriously.CO2 is
Natural medium, stable chemical nature, ODP is that 0, GWP is 1, non-combustible, nontoxic, is a kind of very environmentally friendly refrigerant, heat transfer effect
Rate is high, with volume refrigerating capacity compressor very high.CO2 also has shortcoming as refrigerant, is exactly operating pressure high, and working range is small.
In order to play the advantage as the CO2 of refrigerant, its shortcoming is overcome, have developed carbon dioxide cascade refrigeration system, titanium dioxide
Carbon produces -30 ~ -55 DEG C of low temperature as low-temperature level refrigerant.
In large-scale carbon dioxide cascade refrigeration system, exhaust end base of oil injection threaded bolt formula being used carbon-dioxide gas compressor, due to operating more
The need for, have some refrigeration oils and be mixed into wherein during carbon dioxide is compressed, although being set in exhaust outlet of compressor
Gs-oil separator is put, but still has had the miscellaneous equipment that a small amount of refrigeration oil can enter in system, this small amount of refrigeration oil will not be automatic
Compressor is returned to, accumulation over time will produce 2 problems：One be gs-oil separator oil level reduction, it is necessary to supplement
New refrigeration oil；Two is the freezing oil content more and more higher of liquid CO 2 in low pressure recycle bucket, and these refrigeration oils can be serious
Evaporation of the carbon dioxide in air-cooler is hindered, the efficiency of air-cooler is reduced.
The refrigeration oil of carbon dioxide system is generally the artificial oil that can be dissolved each other with carbon dioxide, no point in low pressure recycle bucket
Layer phenomenon, it is impossible to directly release refrigeration oil.Existing frequently-used method is that liquid all the way, warp knuckle are drawn from after carbon dioxide recycle pump
Directly return the air entry of compressor after stream valve, the shortcoming of this way be lead back compressor air suction mouthful liquid it is most be two
Carbonoxide, comprises only a small amount of refrigeration oil, and oil return efficiency is low, and the refrigerating capacity of compressor has been lost, and returns liquid excessively, to compression
Machine brings wet stroke, influences the normal operation of compressor.
The content of the invention
To can be dissolved in carbon dioxide in low pressure recycle bucket in refrigeration systems it is an object of the invention to provide a kind of
Refrigeration oil is purified out and returns to compressor automatically, the distribution of refrigeration oil in system is reached dynamic balance state, is improved and is steamed
Send out the carbon dioxide cascade refrigeration system automatic oil-return device of the heat exchange efficiency of device.
1st, carbon dioxide cascade refrigeration system automatic oil-return device of the invention, including the shell described in shell-and-tube heat exchanger
Formula heat exchanger is obliquely installed；
It is connected with shell-and-tube heat exchanger shell side middle part and is connected with the first magnetic valve and the first regulating valve；
It is connected with shell-and-tube heat exchanger shell side bottom and is connected with the second magnetic valve and the second regulating valve；
It is connected with shell-and-tube heat exchanger shell side top and is connected with pressure-difference valve；
Be connected the liquid level gauge for being connected with and being vertically arranged with shell-and-tube heat exchanger shell side, and the bottom and top of liquid level meter are connected to down
Liquid-level switch and upper liquid-level switch；
The bottom termination of shell-and-tube heat exchanger is provided with first interface, and the top termination of shell-and-tube heat exchanger is provided with second interface, the
One regulating valve has the 3rd interface, and pressure-difference valve has the 4th interface, and the second regulating valve has the 5th interface.
The present invention has the advantages that compared with prior art：
First interface in the present apparatus is connected with condenser in refrigeration system or liquid reservoir, and second interface is connected with expansion valve, the
Three interfaces are connected with carbon dioxide pump export pipeline, and the 4th interface is connected with circulation barrel, the 5th interface and compressor air suction mouthful phase
Even.During operation, the carbon dioxide in carbon dioxide and refrigeration oil mixing liquid evaporates to purify refrigeration oil, is evaporated in purification process
The cold transmission that produces of carbon dioxide give high-pressure carbon dioxide liquid, form supercooling, oil scavenger does not lose the refrigeration of system
Amount；The liquid mixture quantity of compressor is entered after purification seldom, and the content of refrigeration oil is very high, to the normal operation shadow of compressor
Sound is small；Oil return efficiency high of the present invention, reliable operation is practical.
Brief description of the drawings
Fig. 1 is the structural representation of the specific embodiment of the invention.
Specific embodiment
As shown in Figure 1：1 is shell-and-tube heat exchanger, and shell-and-tube heat exchanger 1 is by housing 11, heat exchanger tube 12, tube sheet 13 and end socket
14 compositions, form two cavitys of tube side and shell side.Shell-and-tube heat exchanger 1 is obliquely installed, can be by support during installation（Seat）Carry out
Fixed support.
It is sequentially connected by pipeline with the shell side of shell-and-tube heat exchanger 1 middle part and is connected with the first magnetic valve 3 and the first regulating valve 2；
It is sequentially connected by pipeline with the shell side bottom of shell-and-tube heat exchanger 1 and is connected with the second magnetic valve 5 and the second regulating valve 6；
It is connected by pipeline with the shell side of shell-and-tube heat exchanger 1 top and is connected with pressure-difference valve 4；
Be connected the liquid level gauge 7 for being connected with and being vertically arranged with the shell side of shell-and-tube heat exchanger 1 by pipeline, the bottom and top of liquid level meter 7
It is connected to lower liquid-level switch 8 and upper liquid-level switch 9；
The bottom termination of shell-and-tube heat exchanger 1 is provided with first interface 21, and the top termination of shell-and-tube heat exchanger 1 is provided with second interface
22, the first regulating valve 2 is connected with the 3rd interface 23, and pressure-difference valve 4 is connected with the 4th interface 24, and the second regulating valve 6 is connected with the 5th and connects
Mouth 25.
During installation, first interface 21 is connected with condenser in refrigeration system or liquid reservoir, second interface 22 and expansion valve phase
Even, the 3rd interface 23 is connected with carbon dioxide pump export pipeline, and the 4th interface 24 is connected with circulation barrel, the 5th interface 25 and compresses
Machine air entry is connected.
After whole refrigeration system puts into operation, oil return apparatus put into operation, and the device has 2 road fluids, are all the way from storage
The high-temp liquid carbon dioxide that liquid device or condenser come enters heat exchanger tube pass through first interface 21, is too cold in tube side, passes through
Second interface 22 throttles after going out heat exchanger into expansion valve, and the flowing of this road fluid is continuous unremitting；
The flowing of another road fluid be it is discontinuous, it is specific as follows：Oil return apparatus are sampled first after putting into operation, open the
One magnetic valve 3, a certain amount of low temperature oil-containing carbon dioxide liquid is introduced through the 3rd interface 23 from the export pipeline of carbon dioxide pump
Into shell side, the first magnetic valve 3 is closed after shell side liquid level reaches the position of upper liquid-level switch 9, complete sampling, sample liquids are in shell
Heat exchange evaporation is carried out with tube side liquid in journey, is constantly purified, evaporated the gas for producing and subtract through the pressure-regulating valve 4 on shell side top
Circulation barrel is returned to through the 4th interface 24 after pressure, as the liquid level in shell side that carries out of evaporation is constantly reduced, the refrigeration oil in liquid
Content more and more higher, after liquid level drops to lower 8 position of liquid-level switch, opens the second magnetic valve 6, after the pressure in shell side will be purified
Remaining liquid mixture enters compressor air suction through the 5th interface 25, by one section of time delay, completes discharge opeing, closes the second electromagnetism
Valve 6, so completes a circulation, then carry out next sub-sampling.
By adjusting pressure-regulating valve 4, make heat exchanger shell pass pressure be in pump discharge pressure and low pressure recycle bucket pressure it
Between desired value.
By shell-and-tube heat exchanger slant setting, the liquid of housing bottom is entered into compressor to greatest extent.
By adjusting the aperture of the first regulating valve 2 and the second regulating valve 6, reduce the first magnetic valve 3 and the second magnetic valve 5 dozens
The impact formed when opening.
Liquid level gauge 7 can provide control signal from magnetic float-type liquid level gauge, two liquid-level switches of the connection of liquid level gauge 7.Root
According to 2 actions of liquid-level switch, 2 magnetic valves perform different actions, it is possible to achieve automatic oil return, are not required to during normal operation
Want manual intervention.
When oil return apparatus work, the cold transmission that the carbon dioxide evaporated in housing is produced gives high-pressure carbon dioxide liquid
Body, forms supercooling, and oil scavenger does not lose the refrigerating capacity of system.Shell-and-tube heat exchanger top sets pressure-difference valve, for controlling
The evaporating pressure of carbon dioxide and power is provided in housing for oil returns to compressor.Shell-and-tube heat exchanger slant setting, can be maximum
The liquid of housing bottom is entered into limit compressor.1 regulating valve is respectively set 2 upstreams of magnetic valve, for adjusting flow velocity.
Claims (1)
1. a kind of carbon dioxide cascade refrigeration system automatic oil-return device, including shell-and-tube heat exchanger（1）, it is characterised in that：Institute
The shell-and-tube heat exchanger stated（1）It is obliquely installed；
With shell-and-tube heat exchanger（1）Shell side middle part is connected and is connected with the first magnetic valve（3）With the first regulating valve（2）；
With shell-and-tube heat exchanger（1）Shell side bottom is connected and is connected with the second magnetic valve（5）With the second regulating valve（6）；
With shell-and-tube heat exchanger（1）Shell side top is connected and is connected with pressure-difference valve（4）；
With shell-and-tube heat exchanger（1）Shell side is connected the liquid level gauge for being connected with and being vertically arranged（7）, liquid level meter（7）Bottom and upper part
Lower liquid-level switch is not connected with（8）With upper liquid-level switch（9）；
Shell-and-tube heat exchanger（1）Bottom termination be provided with first interface（21）, shell-and-tube heat exchanger（1）Top termination be provided with
Two interfaces（22）, the first regulating valve（2）There is the 3rd interface（23）, pressure-difference valve（4）There is the 4th interface（24）, the second regulating valve
（6）There is the 5th interface（25）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098605.2A CN106766386A (en) | 2017-02-23 | 2017-02-23 | Carbon dioxide cascade refrigeration system automatic oil-return device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098605.2A CN106766386A (en) | 2017-02-23 | 2017-02-23 | Carbon dioxide cascade refrigeration system automatic oil-return device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106766386A true CN106766386A (en) | 2017-05-31 |
Family
ID=58959898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710098605.2A Pending CN106766386A (en) | 2017-02-23 | 2017-02-23 | Carbon dioxide cascade refrigeration system automatic oil-return device |
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| Country | Link |
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| CN (1) | CN106766386A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702377A (en) * | 2017-09-18 | 2018-02-16 | 济南大森制冷设备有限公司 | CO2The method of cold and heat combined supply module unit and cold and heat combined supply |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005241165A (en) * | 2004-02-27 | 2005-09-08 | Mitsubishi Electric Corp | Pipe washing device and method |
| JP2006112773A (en) * | 2004-09-14 | 2006-04-27 | Daikin Ind Ltd | Refrigeration device |
| CN2814269Y (en) * | 2005-07-01 | 2006-09-06 | 烟台冰轮股份有限公司 | Refrigerating system capable of ejecting scavenge return |
| CN102320369A (en) * | 2011-07-11 | 2012-01-18 | 张家港格林沙洲锅炉有限公司 | Low-sulfur oil cooler peculiar to vessel |
| CN203785326U (en) * | 2013-11-06 | 2014-08-20 | Tcl空调器(中山)有限公司 | Variable-frequency air conditioner and compressor oil return system thereof |
| CN206546047U (en) * | 2017-02-23 | 2017-10-10 | 大连冷冻机股份有限公司 | Carbon dioxide cascade refrigeration system automatic oil-return device |
-
2017
- 2017-02-23 CN CN201710098605.2A patent/CN106766386A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005241165A (en) * | 2004-02-27 | 2005-09-08 | Mitsubishi Electric Corp | Pipe washing device and method |
| JP2006112773A (en) * | 2004-09-14 | 2006-04-27 | Daikin Ind Ltd | Refrigeration device |
| CN2814269Y (en) * | 2005-07-01 | 2006-09-06 | 烟台冰轮股份有限公司 | Refrigerating system capable of ejecting scavenge return |
| CN102320369A (en) * | 2011-07-11 | 2012-01-18 | 张家港格林沙洲锅炉有限公司 | Low-sulfur oil cooler peculiar to vessel |
| CN203785326U (en) * | 2013-11-06 | 2014-08-20 | Tcl空调器(中山)有限公司 | Variable-frequency air conditioner and compressor oil return system thereof |
| CN206546047U (en) * | 2017-02-23 | 2017-10-10 | 大连冷冻机股份有限公司 | Carbon dioxide cascade refrigeration system automatic oil-return device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702377A (en) * | 2017-09-18 | 2018-02-16 | 济南大森制冷设备有限公司 | CO2The method of cold and heat combined supply module unit and cold and heat combined supply |
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Application publication date: 20170531 |
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