CN103939324B - Testing device for measuring oil circulation rate of refrigerant compressor based on intermiscibility - Google Patents
Testing device for measuring oil circulation rate of refrigerant compressor based on intermiscibility Download PDFInfo
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Abstract
The invention belongs to the technical field of refrigeration, and particularly relates to a testing device for measuring the oil circulation rate of a refrigerant compressor based on intermiscibility. The device comprises an oil separation assembly, wherein an oil outlet end and a refrigerant outlet end are arranged on the oil separation assembly, the refrigerant outlet end is communicated to the position of a compressor suction port end at least through a condenser, a liquid storage device and an evaporator to form a refrigerant loop, the oil outlet end is communicated with a compressor suction oil return port end to form an oil circulation loop, and flowmeters are arranged on the oil circulation loop and the refrigerant loop; the device also comprises a refrigerating assembly, wherein the liquid supply temperature of the refrigerating assembly is less than the highest two-phase separation temperature of the refrigerant and the refrigerating machine oil; the device not only improves the working efficiency of the whole oil circulation system, but also enables the numerical value measured and calculated by the flow meter on the loop to tend to be more accurate, and finally ensures the accuracy of the oil circulation flow rate measurement data of the refrigerant compressor.
Description
Technical field
The invention belongs to refrigeration technology field, be specifically related to a kind of coolant compressor oil recycle ratio based on intermiscibility and survey
Amount assay device.
Background technology
Refrigerator oil have lubrication, cool down, rinse, the function such as sealing, be the indispensable important component of refrigeration system, so
And simultaneously refrigeration system band also can be served negative effect, such as by being mixed into of refrigerator oil: change cold-producing medium thermophysical property,
Affect the heat-transfer effect etc. of refrigerant side.The circulation of refrigerator oil influences whether the service behaviour of refrigeration system, flows into refrigeration and follows
The oil recycle ratio of ring is also compressor lubrication and a major criterion of sealing property evaluation.
During CNS GB/T5773-2004 specified volume formula coolant compressor performance test, on discharge duct
Should arrange effective oil eliminator, in making the refrigerant liquid of circulation, oil content is less than 1.5% (in mass).And ISO917
Mark principle states: coolant compressor performance test blood circulation oil recycle ratio 1.5% (on the basis of refrigerant mass fluxes)
Above, it is necessary to equipped with high-efficiency oil separator (and requiring that the direct oil return of oil eliminator is to the lubricating system of compressor).The U.S. marks
Quasi-AHRI570-2012 " positive displacement CO2 refrigeration compressor (group) assessment of performance " it further provides for, for CO2 coolant compressor or pressure
If contracting unit uses calorimeter or fluid flowmeter method to carry out performance test, oil recycle ratio should be less than 2%；If using gas stream
Gauge, oil recycle ratio should be less than 1%.The importance of the mensuration of visible kind of refrigeration cycle assay device oil recycle ratio.
At present, the refrigeration compressor that China's standard GB/T5773, foreign standard (such as ISO917, ASHRAE23 etc.) specify is used
What the mensuration of refrigerator oil cycling rate used is all weight method, i.e. uses batch mode to take out the oil mass in condensating refrigerant
Take mensuration of weighing.Carry out owing to its operation is an off running pipeline, have a leak source potential safety hazard, and cannot realize online oil and follow
The measurement of ring rate, needs the longer time when metering, and operation sequence is complicated.
Nippon Standard JIS B8606-1998 defines use auxiliary oil eliminator and carries out refrigeration compressor oil recycle ratio
Measuring method: fill an oil eliminator in coolant compressor aerofluxus tube side, compressor air-discharging mixes through oil eliminator, aerofluxus
Lubricating oil in compound is separated, and collects in the vessel of band oil sight glass, according in container oil mass change and
Circulating mass of refrigerant can calculate the size of oil recycle ratio.The advantage of this kind of device being mounted directly auxiliary oil eliminator is energy
Monitor the change of different time oil recycle ratio；But, the main deficiency of this kind of device is: 1), oil eliminator work efficiency
Remaining to be discussed, most domestic oil eliminator products are separating of oil inefficient, especially at oil eliminator normal working temperature bar
Under part, often occur to cause both not to be completely separated due to the intersolubility problem between cold-producing medium and refrigerator oil, cause oil to follow
Ring rate measurement result is bigger with actual value deviation；2), separate after oil return compressor effect will directly influence oil pump capacity,
Owing to lubricating oil is collected in viewer, the pasta inside compressor reduces, and the oil pump capacity of compressor certainly will have downward trend,
The oil circulation causing whole compressor assembly goes wrong.How to realize the oil circulation of accurate on-line measurement refrigeration compressor
Rate, simultaneously while ensureing that the refrigerator oil discharging in the cold-producing medium of compressor is by high efficiency separation, it is ensured that through separation and
Refrigerator oil after line is measured can return refrigeration compressor smoothly, and this is to use separating of oil method to carry out refrigeration compressor or refrigeration system
The key point of the assay device of system oil recycle ratio on-line measurement and difficult point.
Summary of the invention
It is an object of the invention to provide the coolant compressor oil recycle ratio based on intermiscibility that a kind of features simple structure is practical
Experiment with measuring device, can effectively promote the work efficiency of whole oil circulation system, and synchronize to guarantee its intrasystem kind of refrigeration cycle
The accuracy of oil circulation flow measuring data, carry out refrigeration compressor oil recycle ratio on-line measurement solving traditional oils partition method
The problem of poor accuracy.
For achieving the above object, present invention employs techniques below scheme:
A kind of coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility, it is characterised in that: include arranging
Separating of oil assembly at compressor air-discharging end, after described separating of oil assembly being provided for discharge separation, the oil of refrigerator oil goes out
Mouthful end and discharging separate after the refrigerant gas outlet end of cold-producing medium, refrigerant outlet end at least via condenser, reservoir and
Vaporizer is communicated to compressor air suction mouth end and sentences formation refrigerant loop, and oil export end connects with compressor air suction oil return opening end
Arrange to form oil circulation loop, oil circulation loop and refrigerant loop are arranged effusion meter the most accordingly；This device also includes using
In separating of oil assembly being carried out the cooling assembly of cooling down process, the cryogenic temperature of described cooling assembly less than cold-producing medium with cold
Freeze the highest two-phase laminated flow temperature of machine oil.
Described separating of oil assembly includes oil eliminator and communicates therewith the cold separated part of oil of layout；Described oil export end and system
The cryogen port of export is all arranged on oil eliminator；The refrigeration object of described cooling assembly is oily cold separated part, in oily cold separated part
After the refrigeration of chamber, layering forms refrigerator oil liquid layer and cold-producing medium liquid layer, and its refrigerator oil liquid layer connects oil circulation circuit entrance end,
And in oily cold separated part, it is additionally provided with the connecting pipeline connected at its inner refrigerant liquid layer and refrigerant loop.
Cooling assembly includes low-temperature receiver and forms loop-coupled refrigeration case therewith, and the cold separated part of described oil is integrally placed at refrigeration
In case.
It is disposed with liquid level sensor of liquid level in monitoring it in the cold separated part of oil, and this liquid level sensor is with outer
The Liquid level inter-module electrical connection in portion is arranged, oil circulation loop there also is provided electric flow control valve；Liquid level sensor sense
When answering oily cold separated part inner fluid liquid level to specified altitude assignment, Liquid level assembly controls electric flow control valve action to realize oil
Liquid refluxes.
The hand flow regulating valve for the pressure release of oil circulation loop it is additionally provided with on oil circulation loop.
The first check valve preventing this loop fluid from backflowing, the conducting direction of the first check valve it is provided with on oil circulation loop
Arrange in the same direction with the fluid flow direction in oil circulation loop.
The second check valve preventing this pipeline refrigerant liquid from backflowing, the conducting side of the second check valve it is provided with on connecting pipeline
Arrange in the same direction to the refrigerant liquid flow direction with this connecting pipeline.
Described connecting pipeline connects the reservoir at oily cold separated part and refrigerant loop and arranges；Stream on refrigerant loop
Gauge is arranged at one section of pipeline after reservoir.
Main advantages of the present invention are:
1), the present invention has abandoned many defects produced by traditional separating of oil system, by utilizing refrigerator oil and system
Two intermiscibilities between cryogen, with the arrangement of cooling assembly, it is achieved thereby that the freezing that compressor air-discharging end is discharged
Machine oil and the cooling Multi-layer technology effect of cold-producing medium；On the one hand, originally owing to separating the compressor oil return effect thoroughly not caused
The problem that rate is low can obtain being obviously improved the most directly solving；The more important thing is, by the current system measured before work
The refrigerator oil of cooling system use and the highest two-phase laminated flow temperature of cold-producing medium, thus adjust the cooling down model of cooling assembly
Enclose, the cooling so that the mixture of the refrigerator oil discharged by compressor air-discharging end and cold-producing medium is caught a cold so that oil divides
While carrying out Oil-gas Separation, two phase stratification effect is also produced from component internal；The lubricating oil liquid layer that density is less floats on density
Above bigger cold-producing medium liquid layer, thus by the way of specific aim extracts, reach the extraction purpose to above-mentioned two liquid layers, finally
Lead in corresponding circuit via corresponding pipeline.Owing to above-mentioned refrigeration separate mode ensure that refrigerator oil and refrigeration greatly
High efficiency separation degree between agent, it not only improves the work efficiency of whole oil circulation system, also makes the stream on loop simultaneously
The numerical value that gauge calculates tends to accuracy, finally ensure that the essence of the oil circulation flow measuring data of coolant compressor
Really property.
2), actually used time, by using oil eliminator and the engagement formation of the cold separated part of oil, thus echelon can be realized
The separation and Extraction function of refrigerator oil and cold-producing medium.During operation, on the one hand relying on traditional oil eliminator, preliminary guarantees gaseous state
Cold-producing medium and a large amount of separating effects of liquid cryogenic machine oil；Afterwards, refrigerator oil is introduced oily cold separated part via pipeline again
In, rely on the effect of cooling assembly, to refrigerator oil and its include cold-producing medium and carry out accurate multi_layer extraction, thus ensure that oil
Flowmeter survey flow in closed circuit can truly reflect the oil circulation amount of coolant compressor place refrigeration system, and now
Effusion meter calculation of measured data at refrigerant loop just includes complete refrigerant flow, the therefore effusion meter at refrigerant loop
Measure flow and reflect the circulating mass of refrigerant of refrigerant compressor system the most really, and then also ensure that entirety was calculated
The accuracy of journey.
3), the arrangement of cooling assembly, with as refrigeration machine class low-temperature receiver coordinate refrigeration case, thus play entirety cladding
The purpose of the cold separated part of oil so that oily cold separated part can uniformly be caught a cold, and then reach to guarantee its inner fluid and refrigerant liquid
Multi_layer extraction effect；Each layout regulating valve on oil circulation loop, it is achieved separate the blood pressure lowering of rear oil duct, avoid high pressure oil return pair
The internal oil sump of compressor causes disturbance to impact；The layout of check valve, then avoid returning of fluid at respective line or refrigerant liquid
Flow phenomenon, to guarantee the functional reliability of its system.
4), liquid level sensor and Liquid level assembly or even the design of electric flow control valve, it is ensured that its whole system
Intelligent automatic demand for control, after the level sensing height in presetting oily cold separated part, once liquid level sensor sensing
When the cold separated part inner fluid liquid level of oil is to specified altitude assignment, Liquid level assembly controls electric flow control valve action to realize fluid
Backflow；Thus many defects such as wasting time and energy of having abandoned that traditional backflow manually etc. brought, its operation is apparently more
Convenient and swift, can effectively promote the practical operation efficiency of whole system.
Accompanying drawing explanation
Fig. 1 is the arrangement schematic diagram of the present invention；
Fig. 2 is the cooperation arrangement figure between oily cold separated part and cooling assembly；
Fig. 3 is the intermiscibility determination data figure of the cold-producing medium R32 in embodiment and refrigerator oil.
In figure, the corresponding relation of each label toponym each with the present invention is as follows:
A-lubricating oil liquid layer b-cold-producing medium liquid layer c-first-class gauge d-second gauge
10-compressor 20-oil eliminator 21-oil export end 22-refrigerant outlet end
The 30-cold separated part 31-liquid level sensor 32-Liquid level assembly of oil
33-electric flow control valve 34-hand flow regulating valve 35-the first check valve
41-low-temperature receiver 42-refrigeration case 50-the second check valve
Detailed description of the invention
For ease of understanding, the assembly being specifically described the present invention here in connection with cold-producing medium R32 and Fig. 1-3 constructs and concrete
Workflow；The focus cold-producing medium that R32 substitutes as HCFC (HCFC), itself and refrigerator oil are at refrigerating system oil separator
Dissolving each other when majority under operational temperature conditions, the two can not be kept completely separate in oil eliminator 20, using it as representative
Property describes thing, the invention emphasis of the present invention the most for convenience of explanation.Owing to using traditional oils partition method to carry out R32 refrigeration compressor
When oil recycle ratio is measured, its oil circuit is measured in loop inevitably still dissolved with some refrigerant, causes flowing in refrigerant loop
Measure flow in loop less than normal, oil circulation bigger than normal after then containing some refrigerant, thereby result in oil recycle ratio measurement data bigger than normal.
Fig. 3 is that R32 is suitable for the compatibility test determination data of refrigerator oil, i.e. the two-phase laminated flow temperature curve of the two with certain
(below two-phase laminated flow temperature, there is substantially layering in R32 and refrigerator oil, and refrigerator oil density is less than cold-producing medium, is positioned at
Layer), it can be seen that the highest two-phase laminated flow temperature of the two be less than 20 DEG C, now can use small-sized refrigerator as low-temperature receiver 41,
Make it for liquid temp less than 20 DEG C, can meet and the two is carried out treatment effect of lowering the temperature, so that it is guaranteed that under each oil content ratio its
Refrigerator oil namely lubricating oil and effective multi_layer extraction of cold-producing medium in mixture.
Embodiment of the present invention intermiscibility determination data based on R32 Yu refrigerator oil, proposes the oily subpackage to refrigeration system
Put and carry out further Temperature Treatment: the cooling process of the thing that refrigerator oil-cold-producing medium dissolved each other by low-temperature receiver 41, utilize the two close
Degree difference promotes further multi_layer extraction；The level height of the cold separated part 30 of oil is by liquid level sensor system, namely liquid level sensor
31, Liquid level assembly 32 and electric flow control valve 33 teamwork, thus realize the refrigerator oil after layering and liquefaction
Cold-producing medium automatically extract proposition.
This device be embodied as illustration as it is shown in figure 1, specifically include that the oil eliminator 20 and compressor communicated with each other
10, refrigerant outlet end 22 and oil export end 21 on oil eliminator 20 backflow via refrigerant loop and oil circulation loop respectively
To compressor 10, dissolved with a small amount of cold-producing medium in the lubricating oil discharged in described oil export end 21；The import of the cold separated part 30 of oil
End connects oil eliminator 20, and it possesses the connecting pipeline connecting reservoir, and it is also equipped with connecting oil circulation circuit entrance simultaneously
Connection end；The refrigerated area (namely refrigeration case 42) of cooling assembly is completely covered the oily cold separated part 30 of cladding, at cooling machine oil and
After the mixture of cold-producing medium enters oily cold separated part 30, produce lamination being affected by refrigerating environment, now fridge
The lubricating oil liquid layer a that formed of oil because density is relatively low on float on refrigerant liquid layer b, as in figure 2 it is shown, the most again by corresponding
Pipeline realize its layered extraction effect specifying liquid layer, and synchronize the fluid in lubricating oil liquid layer a is inputted to the most oil circulation
In loop, and owing to the cold-producing medium at now cold-producing medium liquid layer b has formed liquid, can be directly inputted in reservoir,
Complete refrigerator oil and R32 cold-producing medium high efficiency separation purpose eventually.
This device entire run process is as follows: the R32 cold-producing medium entrainment of refrigerator oil enters through compressor 10 exhaustor
Oil eliminator 20 carries out initial gross separation, and now refrigerator oil and R32 cold-producing medium separate in a large number, and R32 refrigerant flow direction condenser is cold
Enter reservoir after Ning, flow through a small amount of of the aforementioned R32 cold-producing medium after reservoir and secondary separation at oily cold separated part 30
R32 cold-producing medium enters the effusion meter arranged in advance at this together and (is set in first-class gauge c), it is achieved R32 refrigerant compression herein
The accurate metering of machine discharging refrigerant；Refrigerator oil then accumulates in the inner chamber liquid upper strata of oily cold separated part 30, the most successively
Flow through the effusion meter on electric flow control valve 33, oil circulation loop and (be set to second gauge d), hand flow regulating valve herein
34 and first check valve 35, finally flow in compressor.The stability of the cold separated part 30 of oil and the internal oil level of compressor 10 is by front
The liquid level sensor system stated ensures；Read reading m at first-class gauge c at regular intervals1With reading m at second gauge d2,
Pass through OCR=m1/(m1+m2) calculate the oil recycle ratio (OCR) that can draw R32 refrigeration compressor.
This device, when installing into existing refrigeration system, is possible not only to independent complete use, simultaneously even can be directly at mesh
Update on front oil eliminator 20: namely at oil eliminator 20 oil-out, arrange the cold separation of oil possessing cooling assembly
Portion 30, and cold to oil circulation circuit entrance and oil separated part 30 is docked, and oily cold separated part 30 draws connecting pipeline pair the most accordingly
It is connected to, at 1/3～1/4 height and position of reservoir inner chamber, again its structure is adjusted by aforementioned processing process；Its
Renewal of the equipment low cost and update simple and efficient to handle, be extremely applicable to the operation that quickly updates of current batch device,
Simultaneously the most also can the effective work efficiency of lifting operation person and improve the accuracy of data measured in the updated, achieve many things at one stroke, market
Have a extensive future.
Claims (7)
1. a coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility, it is characterised in that: include being arranged in
Separating of oil assembly at compressor (10) exhaust end, after described separating of oil assembly being provided for discharge separation, the oil of lubricating oil goes out
Mouthful end (21) and the refrigerant outlet end (22) of cold-producing medium after discharging separation, refrigerant outlet end (22) at least via condenser,
Reservoir and vaporizer are communicated to compressor (10) air entry end and sentence formation refrigerant loop, oil export end (21) and compressor
(10) connection of air-breathing oil return opening end is arranged to form oil circulation loop, and oil circulation loop and refrigerant loop are arranged stream the most accordingly
Gauge；This device also includes the cooling assembly for separating of oil assembly carries out refrigeration process, the confession liquid temperature of described cooling assembly
Degree is less than the highest two-phase laminated flow temperature of cold-producing medium with refrigerator oil；
Described separating of oil assembly includes oil eliminator (20) and communicates therewith the cold separated part of the oil (30) of layout；Described oil export end
(21) all it is arranged on oil eliminator (20) with refrigerant outlet end (22)；Oil eliminator (20) passes through oil export end (21) and oil
Cold separated part (30) connects；The cooling down object of described cooling assembly is oily cold separated part (30), in oily cold separated part (30)
After the cooling down of chamber, layering forms refrigerator oil liquid layer (a) and cold-producing medium liquid layer (b), and its refrigerator oil liquid layer (a) connection oil follows
It is additionally provided with on loop back path arrival end, and oily cold separated part (30) at its inner refrigerant liquid layer (b) of connection and refrigerant loop
Connecting pipeline.
Coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility the most according to claim 1, its feature
It is: cooling assembly includes low-temperature receiver (41) and forms loop-coupled refrigeration case (42) therewith, and the cold separated part of described oil (30) is whole
Body is placed in refrigeration case (42).
Coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility the most according to claim 1 and 2, it is special
Levy and be: in oily cold separated part (30), be disposed with the liquid level sensor (31) of liquid level in monitoring it, and this liquid level passes
Electrically connect layout between sensor (31) with outside Liquid level assembly (32), oil circulation loop there also is provided electric flow control
Valve (33)；When liquid level sensor (31) senses oily cold separated part inner fluid liquid level to specified altitude assignment, Liquid level assembly (32) is controlled
Electric flow control valve processed (33) action is to realize fluid backflow.
Coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility the most according to claim 1 and 2, it is special
Levy and be: on oil circulation loop, be additionally provided with the hand flow regulating valve (34) for the pressure release of oil circulation loop.
Coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility the most according to claim 1 and 2, it is special
Levy and be: on oil circulation loop, be provided with the first check valve (35) preventing this loop fluid from backflowing, the first check valve (35)
The fluid flow direction in conducting direction and oil circulation loop is arranged in the same direction.
Coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility the most according to claim 1 and 2, it is special
Levy and be: on connecting pipeline, be provided with the second check valve (50) preventing this pipeline refrigerant liquid from backflowing, the second check valve (50)
The refrigerant liquid flow direction of conducting direction and this connecting pipeline arrange in the same direction.
Coolant compressor oil recycle ratio experiment with measuring device based on intermiscibility the most according to claim 1 and 2, it is special
Levy and be: described connecting pipeline connects the reservoir at oily cold separated part (30) and refrigerant loop and arranges；On refrigerant loop
Effusion meter be arranged at one section of pipeline after reservoir.
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| CN201410172995.XA CN103939324B (en) | 2014-04-25 | 2014-04-25 | Testing device for measuring oil circulation rate of refrigerant compressor based on intermiscibility |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018179190A1 (en) * | 2017-03-29 | 2018-10-04 | 株式会社日立産機システム | Liquid-feed type gas compressor |
| CN108759174B (en) * | 2018-06-13 | 2020-01-07 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and oil return control method and device thereof |
| CN109374831A (en) * | 2018-10-30 | 2019-02-22 | 天津商业大学 | Refrigerant and lubricating oil intermiscibility experimental apparatus for testing |
| CN110793798B (en) * | 2019-11-20 | 2021-07-30 | 上海交通大学 | Refrigeration system oil stagnation characteristic comprehensive test device and test method thereof |
| CN110987712A (en) * | 2019-12-06 | 2020-04-10 | 合肥通用机械研究院有限公司 | Device and method for sampling and measuring oil content of refrigerant |
| US11821663B2 (en) | 2020-07-22 | 2023-11-21 | Purdue Research Foundation | In-situ oil circulation ratio measurement system for vapor compression cycle systems |
| CN113959122B (en) * | 2021-09-16 | 2023-03-31 | 青岛海尔空调电子有限公司 | Refrigeration system, control method and control device for refrigeration system |
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Address after: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Patentee after: Hefei General Environmental Control Technology Co., Ltd Address before: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee before: HEFEI GENERAL MACHINERY Research Institute Patentee before: Hefei General Environmental Control Technology Co., Ltd |
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