CN102619740A - Oil displacement testing system of compressor - Google Patents
Oil displacement testing system of compressor Download PDFInfo
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- CN102619740A CN102619740A CN2011100313271A CN201110031327A CN102619740A CN 102619740 A CN102619740 A CN 102619740A CN 2011100313271 A CN2011100313271 A CN 2011100313271A CN 201110031327 A CN201110031327 A CN 201110031327A CN 102619740 A CN102619740 A CN 102619740A
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Abstract
The invention provides an oil displacement testing system of a compressor, which comprises the compressor, a condenser and an evaporator and further comprises a non-contact optical fiber refractive index sensor and a data processing module device. The non-contact optical fiber refractive index sensor is arranged between the condenser and the evaporator and used for measuring refractive index of mixture of liquid refrigerant flowing from the condenser and oil. The data processing module device is connected with the non-contact optical fiber refractive index sensor and used for calculating oil displacement of the compressor according to the measured refractive index of the mixture of the liquid refrigerant flowing from the condenser and the oil through the non-contact optical fiber refractive index sensor. By means of the non-contact optical fiber refractive index sensor, the oil displacement testing system of the compressor obtains the refractive index by taking actual temperature and pressure during operation of an air conditioner into account, can reflect the current refractive index of the mixture of the refrigerant and the oil in the air conditioner, and is high in accuracy of calculated oil displacement of the compressor.
Description
Technical field
The present invention relates to measuring technology, relate in particular to a kind of oily discharge-amount test system of compressor.
Background technique
Air-conditioning is to carry out heat exchange with the low temperature refrigerant behind the hot air in a kind of suction chamber, arranges heat-exchanged air to indoor equipment.Particularly, compressor is compressed into high temperature and high pressure gas with refrigerant, and the refrigerant of HTHP is through condenser generation condensation.Through evaporator evaporation, form the gas of low-temp low-pressure through the refrigerant behind the condenser, flow to heat exchanger.Along with carrying out heat exchange with air, the two phase refrigerants that the refrigerant after the inflow heat exchanger becomes the gas-liquid of low-temp low-pressure gradually and deposits.This refrigerant flows into compressor again, accomplishes the circulation of refrigerant.
High temperature and high pressure gas after the process compressor compresses comprises the oil of lubricate usually, and the mixture of the refrigerant of HTHP and oil becomes liquid state through behind the condenser.In the mixture of refrigerant and oil, if the ratio of oil is too high, then influence the heat exchange of refrigerant and air easily, thereby therefore influence refrigeration or heating effect, need the ratio of the oily and refrigerant of reasonably control.
Usually, need control the ratio of oil and refrigerant through the oily discharge-amount of test compression machine.The oil discharge-amount is meant the quality of oil and the ratio of the quality sum of oil and refrigerant.
In the existing technology, the oily discharge-amount test method of compressor comprises: the quality b of quality a when measuring the vacuum of air-conditioning cistern in advance and clean beaker; When needs are measured the oily discharge-amount of compressor, interrupt operation of air conditioner, measurement is at the quality c of the air-conditioning cistern in the outlet port of condenser, and the quality c of this moment comprises cistern and the quality of oil with the mixture of refrigerant; The mixture of oil in the cistern and refrigerant is poured in the beaker, measured the quality e of the beaker after refrigerant volatilizees, and measure the quality d of the air-conditioning cistern after the refrigerant volatilization; The oily discharge-amount that so just can calculate compressor is [(d+e)-(a+b)]/(c-a).
The problem that the oily discharge-amount test method of this compressor exists is: since the mixture of oil and refrigerant is a coolant circulating system at air-conditioning interrupt and taking-up after measure; Like this; Temperature and pressure when the result who measures does not consider the air-conditioning actual motion; Can't accurately reflect the coolant circulating system real oily discharge-amount of when operation of air-conditioning, the oily discharge-amount accuracy rate of the compressor of measuring is low; And this test method requirement interruption air-conditioning, can't realize real-time reproduction measurement; In addition, also can't add to again in the air-conditioning, cause the waste of oil through the oil of testing.
Summary of the invention
The present invention provides a kind of oily discharge-amount test system of compressor, and the oily discharge-amount accuracy rate that is used for solving the compressor that existing technology measures is low, can't realize the problem that real-time reproduction is measured and caused the waste of oil in the air-conditioning easily.
The invention provides a kind of oily discharge-amount test system of compressor, comprise compressor, condenser and vaporizer, also comprise:
Contactless optical fiber index sensor is arranged between said condenser and the said vaporizer, is used to measure the refrigerant of the liquid state that flows out from said condenser and the refractive index of the mixture of oil; And
Data processing equipment; Be connected with said contactless optical fiber index sensor; The refrigerant of the liquid state that flows out from said condenser that is used for measuring according to said contactless optical fiber index sensor and the refractive index of the mixture of oil calculate the oily discharge-amount of compressor.
The oily discharge-amount test system of compressor provided by the invention; Measure the refractive index of the mixture of liquid refrigerant and oil through contactless optical fiber index sensor; Calculate the oily discharge-amount that obtain compressor according to the refrigerant of the liquid state that measures with the refractive index of the mixture of oil by data processing equipment; Need not to take out refrigerant and measure with the mixture of oil from the outlet port of condenser, through this non-contact measurement, the temperature and pressure of reality when the refractive index that obtains has been considered operation of air conditioner; Can accurately reflect the refractive index of refrigerant in the current air-conditioning and the mixture of oil, the oily discharge-amount accuracy rate of the compressor that calculates is high; And, need not to interrupt the normal operation of air-conditioning, can realize real-time reproduction measurement; In addition, measure with the mixture of oil, therefore can not cause the waste of oil in the air-conditioning owing to need not to take out refrigerant from the outlet port of condenser.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the application, feature and advantage will be more obvious through following.
Main description of reference numerals:
The 1-compressor; The 2-condenser;
The 3-vaporizer; The contactless optical fiber index sensor of 4-;
The 5-data processing equipment; The 6-linear expansion valve;
10-first heat exchanging pipe; 20-second heat exchanging pipe;
10a, the 20a-valve; 30-hair fastener pipe;
The 31-inlet; The 32-outlet;
T1-pressure of inspiration(Pi) measuring point; T2-exhaust pressure measuring point;
The T3-ODR measuring point; The 7-capillary tube.
Description of drawings
The exemplary structural representation that the oily discharge-amount test system embodiment one of compressor of the present invention is shown of Fig. 1;
The exemplary structural representation that the oily discharge-amount test system embodiment two of compressor of the present invention is shown of Fig. 2;
The exemplary a kind of structural representation that vaporizer among Fig. 2 is shown of Fig. 3;
The exemplary a kind of structural representation that condenser among Fig. 2 is shown of Fig. 4;
The exemplary test schematic representation that the compressor output that relates in the embodiments of the invention is shown of Fig. 5.
Embodiment
Below with the embodiment of DETAILED DESCRIPTION The present application.Should be noted that the embodiments described herein only is used to illustrate, be not limited to the application.
The exemplary structural representation that the oily discharge-amount test system embodiment one of compressor of the present invention is shown of Fig. 1, this system comprises compressor 1, condenser 2 and vaporizer 3, also comprises contactless optical fiber index sensor 4 and data processing equipment 5.Contactless optical fiber index sensor 4 is arranged between condenser 2 and the vaporizer 3, is used to measure the refrigerant of the liquid state that flows out from condenser 2 and the refractive index of the mixture of oil.Data processing equipment 5 is connected with contactless optical fiber index sensor 4, and the refrigerant of the liquid state that flows out from condenser 2 that is used for measuring according to contactless optical fiber index sensor 4 and the refractive index of the mixture of oil calculate the oily discharge-amount of compressor.Between condenser 2 and vaporizer 3, can also be provided with the throttling arrangement of the flow that is used to control the refrigerant that gets into vaporizer 3; This throttling arrangement can be linear expansion valve (Linear Expansion Valve; Be called for short LEV), also can be capillary tube (capillary, CAPI).Among the embodiment shown in Figure 1, be that LEV6 is that example is introduced with throttling arrangement.
Contactless optical fiber index sensor 4 is a kind of optical fiber transducers that can measure liquid refractive index, and the refrigerant that does not need the liquid state that contact condenser 2 flows out and the mixture of oil promptly can be measured the refractive index of mixture.This contactless optical fiber index sensor 4 can be selected concrete model and kind according to the needs of measuring.
Data processing equipment 5 can be a computer.Also can be the mini-plant that comprises central processing unit (CentralProcessing Unit is called for short CPU) and display device, calculate by CPU after the oily discharge-amount of compressor, can result of calculation be shown by display device.
According to an embodiment; The oily discharge-amount test system of the compressor among the present invention can also comprise ABAP Adapter; Be connected with data processing module with contactless optical fiber transducer respectively, the data transmission that is used for contactless optical fiber transducer is measured is given data processing equipment.
The working principle of the oily discharge-amount test system of this compressor is: compressor 1 shortens refrigerant and oil pressure the gas of HTHP into, and the gas of HTHP becomes liquid state through behind the condenser 2.Contactless optical fiber index sensor 4 is arranged on the outlet port of condenser 2; Can measure the refractive index of the liquid refrigerant and the mixture of oil, the refrigerant of the liquid state that data processing equipment 5 measures according to contactless optical fiber index sensor 4 and the refractive index of the mixture of oil can calculate the oily discharge-amount of compressor.
Data processing equipment 5 can be according to refrigerant and the refractive index of the mixture of oil, the refractive index of refrigerant, the refractive index of oil, the density of refrigerant and the oily discharge-amount that oily densitometer is calculated compressor of liquid state.
Particularly, can calculate the oil volume percentage of compressor according to following formula (1):
n＝βn
r+(1-β)n
o (1)
In the formula (1), n is the refractive index of refrigerant with the mixture of oil of the liquid state that measures of contactless optical fiber index sensor, n
rBe the refractive index of refrigerant, n
oBe the refractive index of oil, β is the refrigerant percent by volume.
n
rAnd n
oBe known constant, n can be measured by contactless optical fiber index sensor, like this, just can calculate refrigerant percent by volume β according to formula (1), and then can calculate oil volume percentage ODR
V=1-β.
Then, calculate the oily discharge-amount of compressor according to formula (2):
ODR
W＝ODR
V×ρ
o/[ODR
V×ρ
o+(1-ODR
V)×ρ
r] (2)
In the formula (2), ρ
rBe the density of refrigerant, ρ
oBe the density of oil, ODR
VBe oil volume percentage.
ρ
rAnd ρ
oBe known constant, ODR
VCan obtain by formula (1), like this, just can calculate compressor oil discharge-amount ODR according to formula (2)
W
The oily discharge-amount test system of the compressor that the embodiment of the invention one provides; Measure the refractive index of the mixture of liquid refrigerant and oil through contactless optical fiber transducer; Calculate the oily discharge-amount that obtain compressor according to the refrigerant of the liquid state that measures with the refractive index of the mixture of oil by data processing equipment; Need not to take out refrigerant and measure with the mixture of oil from the outlet port of condenser, through this non-contact measurement, the temperature and pressure of reality when the refractive index that obtains has been considered operation of air conditioner; Can accurately reflect the refractive index of refrigerant in the current air-conditioning and the mixture of oil, the oily discharge-amount accuracy rate of the compressor that calculates is high; And, need not to interrupt the normal operation of air-conditioning, can realize reproducing and measure.In addition, measure with the mixture of oil, therefore can not cause the waste of oil in the air-conditioning owing to need not to take out refrigerant from the outlet port of condenser.
The oily discharge-amount test system of compressor need be tested the oily discharge-amount of the compressor of different refrigerating capacities usually; For example; Needing the test refrigerating capacity is that (BTU was the unit of refrigerating capacity, 1BTU/ hour=0.293W), the compressor of 8KBTU/ hour etc. in 6KBTU/ hour.
Usually, the oily discharge-amount for the compressor of testing different refrigerating capacities needs special condenser and vaporizer.For example, if the test refrigerating capacity is the oily discharge-amount of 6KBTU/ hour compressor, the condenser and the vaporizer that just need configuration one cover and 6KBTU/ hour refrigerating capacity to be complementary.If the test refrigerating capacity is the oily discharge-amount of 12KBTU/ hour compressor, the condenser and the vaporizer that just need configuration one cover and 12KBTU/ hour refrigerating capacity to be complementary.Like this, not only test program is complicated, and testing cost is high.
The problem that faces when overcoming the oily discharge-amount of above-mentioned test different compressors; In the embodiments of the invention; In condenser and vaporizer, be provided with a plurality of heat exchanging pipes, the entrance and exit of each heat exchanging pipe is provided with valve, through adjusting opening and closing of each valve; Thereby optionally open the different heat exchange pipeline, realization is to the test of the oily discharge-amount of the compressor of different refrigerating capacities.
The exemplary structural representation that the oily discharge-amount test system embodiment two of compressor of the present invention is shown of Fig. 2; In the system shown in the embodiment two; Except comprising contactless optical fiber index sensor and the data processing equipment shown in embodiment one, the structure division of condenser and vaporizer also improves.Vaporizer 3 comprises at least two first heat exchanging pipes 10; Each first heat exchanging pipe 10 comprises inlet, outlet and at least one hair fastener pipe (structure of inlet, outlet and hair fastener pipe is shown in Fig. 3), and the entrance and exit of each first heat exchanging pipe 10 can be provided with a valve 10a respectively.Condenser 2 comprises at least two second heat exchanging pipes 20; Each second heat exchanging pipe 20 comprises inlet, outlet and at least one hair fastener pipe (structure of inlet, outlet and hair fastener pipe is shown in Fig. 3), and the entrance and exit of each second heat exchanging pipe 20 can dispose a valve 20a respectively.
Among the embodiment shown in Figure 2, the quantity of the hair fastener pipe that each first heat exchanging pipe 10 and second heat exchanging pipe 20 comprise can be corresponding with preset refrigerating capacity respectively.The quantity of hair fastener pipe is many more, and the refrigerating capacity that can reach is big more.With the outlet of each first heat exchanging pipe 10 and second heat exchanging pipe 20 and the valve open of ingress, just can realize measurement through optionally for the oily discharge-amount of the compressor of various refrigerating capacities.
Each first heat exchanging pipe can comprise an entrance and exit separately in the vaporizer, also can shared same outlet, and/or shared same inlet.When shared same outlet of each first heat exchanging pipe and shared same inlet; The valve of outlet and ingress can be a multiway valve; For example, triple valve, four way valve etc. so just can optionally be opened some or a plurality of first heat exchanging pipes.In the condenser each second heat exchanging pipe can comprise an entrance and exit separately, also can shared same outlet, and/or shared same inlet.When shared same outlet of each second heat exchanging pipe and shared same inlet; The valve of outlet and ingress can be a multiway valve; For example, triple valve, four way valve etc. so just can optionally be opened some or a plurality of second heat exchanging pipes.
The exemplary a kind of structural representation that vaporizer among Fig. 2 is shown of Fig. 3, vaporizer comprises 3 first heat exchanging pipes, is labeled as A, B and C respectively, each first heat exchanging pipe comprises a plurality of hair fastener pipes (hairpin) 30, inlet 31 and exports 32.Arrow among Fig. 3 illustrates the flow direction of refrigerant.
For example, the first heat exchanging pipe A can comprise 6 hair fastener pipes, when the valve open in the valve of the ingress of the first heat exchanging pipe A and outlet port, and can be corresponding to 8KBTU/ hour preset refrigerating capacity.The first heat exchanging pipe B can comprise 5 hair fastener pipes, when the valve open in the valve of the ingress of the first heat exchanging pipe B and outlet port, and can be corresponding to 6KBTU/ hour preset refrigerating capacity.The first heat exchanging pipe C can comprise 7 hair fastener pipes, when the valve open in the valve of the ingress of the first heat exchanging pipe B and outlet port, and can be corresponding to 10KBTU/ hour preset refrigerating capacity.
The exemplary a kind of structural representation that condenser among Fig. 2 is shown of Fig. 4.Condenser comprises 3 second heat exchanging pipes, is labeled as D, E and F respectively, and each second heat exchanging pipe comprises a plurality of hair fastener pipe 30, inlet 31 and exports 32.Wherein, the second heat exchanging pipe D, E and F can shared outlets 32.Because three second shared outlets of heat exchanging pipe among Fig. 4 are not easy to illustrate each second heat exchanging pipe and specifically comprise which hair fastener pipe, entrance and exit, therefore, mark D, E and the F among Fig. 4 just illustrates the approximate location of three second heat exchanging pipes.
When the valve open in the valve of the ingress of the second heat exchanging pipe D and outlet port, can be corresponding to 6KBTU/ hour preset refrigerating capacity.When the valve open in the valve of the ingress of the second heat exchanging pipe E and outlet port, can be corresponding to 8KBTU/ hour preset refrigerating capacity.When the valve open in the valve of the ingress of the second heat exchanging pipe F and outlet port, can be corresponding to 10KBTU/ hour preset refrigerating capacity.
Optionally control first heat exchanging pipe and second heat exchanging pipe the entrance and exit place valve open with close, can satisfy the test of the oily discharge-amount of compressor with various refrigerating capacities.Table one illustrates the valve open and the corresponding relation of closing with compressor output of each heat exchanging pipe of vaporizer and condenser.
Table one
| Vaporizer | Condenser |
| B → 6K BTU/ hour | D → 6K BTU/ hour |
| A → 8K BTU/ hour | E → 8K BTU/ hour |
| C → 10K BTU/ hour | F → 10K BTU/ hour |
| A+B → 12K BTU/ hour | D+E → 12K BTU/ hour |
| B+C → 14K BTU/ hour | D+F → 14K BTU/ hour |
| A+C → 18K BTU/ hour | E+F → 18K BTU/ hour |
In the table one, expression in B → 6K BTU/ hour is when the refrigerating capacity of the compressor of need testing is 6KBTU/ hour, with the valve open at the entrance and exit place of the first heat exchanging pipe B, remaining valve closing.Expression in D → 6K BTU/ hour is when the refrigerating capacity of the compressor of need testing is 6K BTU/ hour, with the valve open at the entrance and exit place of the second heat exchanging pipe D, remaining valve closing.Expression in A+B → 12K BTU/ hour is when the refrigerating capacity of the compressor of need testing is 12K BTU/ hour, with the valve open at the entrance and exit place of the first heat exchanging pipe A and B, remaining valve closing.Expression in D+E → 12K BTU/ hour is when the refrigerating capacity of the compressor of need testing is 12K BTU/ hour, with the valve open at the entrance and exit place of the second heat exchanging pipe D and E, remaining valve closing.By that analogy, the implication of all the other contents is similar in the table one, repeats no more.
Among Fig. 3 of the present invention and Fig. 4; Comprise that with vaporizer three first heat exchanging pipe A, B, C and condensers comprise that three second heat exchanging pipe D, E, F are that example is introduced respectively; In practical application, the number of heat exchanging pipe in condenser and the vaporizer can be set according to the test needs.
The exemplary test schematic representation that the compressor oil discharge-amount that relates in the embodiments of the invention is shown of Fig. 5 can be provided with pressure of inspiration(Pi) measuring point T1, exhaust pressure measuring point T2 and oily discharge-amount (OilDischarge Rate is called for short ODR) measuring point T3 in system; When test; Can at first condenser 2 and the valve in the vaporizer 3 slowly be opened, behind the injection refrigerant, rough measure suction and discharge pressure; Opening degree with the valve in condenser 2 and the vaporizer 3 strengthens then, measures air-breathing row pressure power.In addition, contactless optical fiber index sensor can be set at the T3 place, thereby test the oily discharge-amount of the compressor of different refrigerating capacities.Among the embodiment shown in Figure 5, between condenser 2 and vaporizer 3, be provided with capillary tube 7.
The oily discharge-amount test system of compressor provided by the invention; Except measuring the refractive index of the liquid refrigerant and the mixture of oil through contactless optical fiber index sensor; Also in the condenser of air-conditioning and vaporizer, a plurality of first heat exchanging pipes and second heat exchanging pipe are set; Through optionally with the valve open of each heat exchanging pipe with close, just can measure the oily discharge-amount of the compressor of different refrigerating capacities, and need not to dispose different condenser and vaporizer separately to the compressor of every kind of refrigerating capacity; Thereby simplified testing process, and saved testing cost.
Though described the application with reference to exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.Because the application's practical implementation and do not break away from the spirit or the essence of invention in a variety of forms; So be to be understood that; The foregoing description is not limited to any aforesaid details; And should in enclose spirit that claim limited and scope, explain widely, therefore fall into whole variations and remodeling in claim or its equivalent scope and all should be the claim of enclosing and contain.
Claims (9)
1. the oily discharge-amount test system of a compressor comprises compressor, condenser and vaporizer, and this system also comprises:
Contactless optical fiber index sensor is arranged between said condenser and the said vaporizer, is used to measure the refrigerant of the liquid state that flows out from said condenser and the refractive index of the mixture of oil; And
Data processing equipment; Be connected with said contactless optical fiber index sensor; The refrigerant of the liquid state that flows out from said condenser that is used for measuring according to said contactless optical fiber index sensor and the refractive index of the mixture of oil calculate the oily discharge-amount of compressor.
2. system according to claim 1; Wherein, the densitometer of the density of the refractive index of the refractive index of the refractive index of the refrigerant of the said data processing equipment liquid state that flows out from said condenser that is used for measuring according to said contactless optical fiber index sensor and the mixture of oil, refrigerant, oil, refrigerant and oil is calculated the oily discharge-amount of compressor.
3. system according to claim 2, wherein, the refrigerant of the liquid state that flows out from said condenser that said data processing equipment is used for measuring according to said contactless optical fiber index sensor and the refractive index and the formula n=β n of the mixture of oil
r+ (1-β) n
oCalculating oil volume percentage is ODR
V=1-β, and according to formula ODR
W=ODR
V* ρ
o/ [ODR
V* ρ
o+ (1-ODR
V) * ρ
r] calculate the oily discharge-amount of compressor; N is the refractive index of refrigerant with the mixture of oil of the liquid state that measures of contactless optical fiber index sensor, n
rBe the refractive index of refrigerant, n
oBe the refractive index of oil, β is the refrigerant percent by volume, ρ
rBe the density of refrigerant, ρ
oBe the density of oil, ODR
VBe oil volume percentage, ODR
WOily discharge-amount for compressor.
4. system according to claim 1 and 2, wherein, said vaporizer comprises at least two first heat exchanging pipes, each said first heat exchanging pipe comprises inlet, outlet and at least one hair fastener pipe; The entrance and exit place of said first heat exchanging pipe is provided with valve respectively.
5. system according to claim 4, wherein, said condenser comprises at least two second heat exchanging pipes, each said second heat exchanging pipe comprises inlet, outlet and at least one hair fastener pipe; The entrance and exit place of said second heat exchanging pipe is provided with valve respectively.
6. system according to claim 5, wherein, the shared same outlet of each first heat exchanging pipe, and/or shared same inlet; The shared same outlet of each second heat exchanging pipe, and/or shared same inlet.
7. system according to claim 6, wherein, the quantity of the hair fastener pipe that the quantity of the hair fastener pipe that each first heat exchanging pipe comprises and each second heat exchanging pipe comprise is corresponding with preset refrigerating capacity.
8. system according to claim 1 wherein, also is provided with the throttling arrangement of the flow that is used to control the refrigerant that gets into vaporizer between said condenser and vaporizer.
9. system according to claim 8, wherein, said throttling arrangement is linear expansion valve or capillary tube.
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| CN2011100313271A CN102619740A (en) | 2011-01-28 | 2011-01-28 | Oil displacement testing system of compressor |
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|---|---|---|---|
| CN2011100313271A CN102619740A (en) | 2011-01-28 | 2011-01-28 | Oil displacement testing system of compressor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939324A (en) * | 2014-04-25 | 2014-07-23 | 合肥通用机械研究院 | Testing device for measuring oil circulation rate of refrigerant compressor based on intermiscibility |
| CN106524548A (en) * | 2016-11-07 | 2017-03-22 | 清华大学 | Refrigerant mass and flow measuring method and device and measuring instrument |
| CN109404272A (en) * | 2018-12-04 | 2019-03-01 | 长虹华意压缩机股份有限公司 | A kind of equipment of test compression machine oil drain quantity and refrigeration system oil cycle performance |
-
2011
- 2011-01-28 CN CN2011100313271A patent/CN102619740A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939324A (en) * | 2014-04-25 | 2014-07-23 | 合肥通用机械研究院 | Testing device for measuring oil circulation rate of refrigerant compressor based on intermiscibility |
| CN103939324B (en) * | 2014-04-25 | 2016-08-24 | 合肥通用机械研究院 | Testing device for measuring oil circulation rate of refrigerant compressor based on intermiscibility |
| CN106524548A (en) * | 2016-11-07 | 2017-03-22 | 清华大学 | Refrigerant mass and flow measuring method and device and measuring instrument |
| CN109404272A (en) * | 2018-12-04 | 2019-03-01 | 长虹华意压缩机股份有限公司 | A kind of equipment of test compression machine oil drain quantity and refrigeration system oil cycle performance |
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Application publication date: 20120801 |