CN105115204A - Gas-liquid separator capable of controlling lubricating oil circulation volume and control method thereof - Google Patents
Gas-liquid separator capable of controlling lubricating oil circulation volume and control method thereof Download PDFInfo
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- CN105115204A CN105115204A CN201510499533.3A CN201510499533A CN105115204A CN 105115204 A CN105115204 A CN 105115204A CN 201510499533 A CN201510499533 A CN 201510499533A CN 105115204 A CN105115204 A CN 105115204A
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Abstract
The invention discloses a gas-liquid separator capable of controlling the lubricating oil circulation volume. The gas-liquid separator comprises a tank, a three-phase fluid pipe extending into the tank, a gas outlet formed in the upper portion of the tank, a liquid outlet and an oil outlet, wherein the liquid outlet and the oil outlet are formed in the lower portion of the tank. The gas outlet is connected with a gas outlet pipe. The gas outlet pipe comprises an oil return section not higher than the oil outlet in the vertical direction. The oil return section and the oil outlet are communicated through an oil conveying pipe. The oil conveying pipe is provided with an adjusting valve used for controlling flow. The liquid outlet is higher than the oil outlet in the vertical direction. The invention further discloses a lubricating oil circulation volume control method of the gas-liquid separator. The gas-liquid separator is simple in structure, the lubricating oil circulation volume can be conveniently and effectively controlled through the gas-liquid separator and the control method, and stability and heat exchange efficiency of a refrigerating and heating pump system using the gas-liquid separator are improved.
Description
Technical field
The present invention relates to refrigeration and technical field of heat pumps, particularly a kind of gas-liquid separator and control method controlling lubrication oil circulation amount.
Background technology
In carbon dioxide refrigeration/art of heat pumps, gas-liquid separator can the cold-producing medium of storage system interior section, prevents compressor liquid machine and expanding system capacity, regulating system pressure etc.Common carbon dioxide gas-liquid separator is primarily of tank body, two-phase fluid entrance, blast pipe, liquid outlet composition.Wherein two-phase fluid entrance is positioned in the middle part of tank body, and liquid outlet is positioned at tank base.The air inlet of blast pipe is positioned at tank interior, and one end is positioned at tank body top as tank gas vent, and the other end connects tank body, and there is a fixed-size aperture bottom of blast pipe as oil outlet, is positioned at tank base.
In compression carbon dioxide refrigeration/heat pump, due to good compatibility, the normal PAG that uses is as compressor lubricant oil, and PAG lubricating oil and carbon dioxide cannot dissolve each other completely in system.During operation, the lubricating oil that cannot dissolve can along with carbon dioxide be at system Inner eycle, too much lubricating oil can cause heat exchanger heat exchange efficiency to decline, thus serious negative effect is caused to system COP, lubricants capacity deficiency then can cause compressor exhaust temperature to rise, degradation harmful effect under compressor efficiency, even damages compressor time serious.
But when existing carbon dioxide refrigeration/heat pump runs, because density is larger, the lubricating oil that cannot dissolve can accumulate in bottom gas-liquid separator, common gas-liquid separator is by making lubricating oil get back to compressor at the oil outlet of blast pipe, with the steady-state operation of keeping system, but it does not possess the controlling functions to oil return line, and system oil internal circulating load is relevant with carbon dioxide mass flow, can change along with the change of operating mode, when especially using frequency-changeable compressor, oil internal circulating load will change with compressor frequency and change, when oily internal circulating load increases, when systematic steady state runs, bottom gas-liquid separator, lubricating oil burden also can increase, this will cause a large amount of lubricating oil to enter evaporimeter with carbon dioxide liquid, reduce evaporator heat exchange efficiency, similarly, when oily internal circulating load reduces, bottom gas-liquid separator, lubricating oil burden reduces, and causes excess carbon dioxide liquid by the oil outlet of blast pipe, enters compressor with carbon dioxide, cause compressor inlet band liquid.
Therefore, how to make oily internal circulating load in optimization carbon dioxide refrigeration/heat pump improve entire system performance and become very important.
Summary of the invention
The invention provides a kind of gas-liquid separator controlling lubrication oil circulation amount, effectively can optimize the cyclic process of liquid refrigerant and lubricating oil, improve heat exchange efficiency and the operation stability of refrigeration/heat pump system.
A kind of gas-liquid separator controlling lubrication oil circulation amount, comprise tank body, stretch into the three-phase fluid pipe of tank body, be arranged on the gas vent on tank body top, be arranged on liquid outlet and the oil-out of tank body lower part, described gas vent is connected with escape pipe, described escape pipe comprises in vertical direction not higher than the oil return section of oil-out, described oil return section is communicated with by petroleum pipeline with between oil-out, described petroleum pipeline is provided with the control valve controlling flow, and described liquid outlet is in vertical direction higher than described oil-out;
Described gas-liquid separator also comprises the pressure differential of the described liquid outlet of detection and oil-out place plane to control to adjust the sensor cluster of valve opening.
The density that the present invention is applicable to worker quality liquid is less than the refrigeration/heat pump system of the density of lubricating oil liquid, such as carbon dioxide refrigeration/heat pump, adopt carbon dioxide as working medium, oil-out is arranged on the below of liquid outlet by the present invention, partition density different and the worker quality liquid of layering and lubricating oil liquid is come by arranging two liquid outlets in tank body, and by the control of control valve, ensure that lubricating oil liquid enters blast pipe from oil-out, worker quality liquid is discharged from liquid outlet, thus avoid compressor inlet band liquid and lubricating oil and enter the problem that systemic circulation heat exchange reduces heat exchange efficiency.
Sensor cluster to judge the interface location of worker quality liquid and lubricating oil liquid in the pressure differential of described liquid outlet and oil-out place plane by detecting liquid in tank body, thus control and regulation valve opening, realize the flow controlling lubricating oil liquid, avoid lubricating oil in tank body too much to enter liquid outlet or lubricating oil liquid very few and cause worker quality liquid to enter oil-out.
In order to make lubricating oil liquid discharge smoothly, preferably, described petroleum pipeline relative level face tilt is arranged, and described oil-out is positioned at higher-end.
In order to control the flow of lubricating oil liquid better, the angle of inclination of described petroleum pipeline is unsuitable excessive, and preferably, the angle of inclination in described petroleum pipeline relative level face is 5 ° ~ 10 °.Above-mentioned angle can make lubricating oil liquid discharge smoothly, and flow velocity can not be very large, easily through governor valve control and adjustment flow velocity.
In order to make to comprise Working medium gas, worker quality liquid can better in tank body must be separated with the fluid-mixing of lubricating oil liquid, preferably, described oil-out is arranged on the bottom of tank body, described liquid outlet is positioned on the horizontal level of 1/4 ~ 1/3 of described tank body total height, and the outlet of described three-phase fluid pipe is positioned on the horizontal level of 2/3 ~ 3/4 of described tank body total height.Above-mentioned middle and upper part fluid-mixing being passed into tank body is set, thus scatters whole tank body fully, accelerate layering; And liquid outlet and oil-out difference in height are comparatively large, thus make worker quality liquid and lubricating oil liquid have enough mobile spaces, control and regulate the flow rates of lubricating oil liquid large.
In order to make worker quality liquid flow out tank body fast, preferably, the drain pipe that described liquid outlet connects stretches out tank body from the bottom of tank body.
For the ease of manufacture, installation and maintenance, preferably, the oil return section of described escape pipe is positioned at tank body outside.
In order to improve the effect of fluid-mixing gas-liquid separation, preferably, the outlet of described three-phase fluid pipe, in vertical direction lower than described gas vent, is provided with the liquid filtering layer between the outlet and described gas vent of described three-phase fluid pipe in described tank body.After fluid-mixing enters tank body, Working medium gas enters gas vent after rising through the filtration of liquid filtering layer again, effectively improves the separating effect of Working medium gas.
Described liquid filtering layer generally adopts metal mesh shaped or corrugated filler.
Present invention also offers a kind of lubrication oil circulation amount control method of gas-liquid separator, control method is simple, effectively can realize the control to lubrication oil circulation amount, thus ensures refrigeration/heat pump system stable operation and have higher heat exchange efficiency.
A lubrication oil circulation amount control method for gas-liquid separator, uses the gas-liquid separator of above-mentioned controlled lubrication oil circulation amount, comprises the following steps:
(1) fluid-mixing comprising Working medium gas, worker quality liquid and lubricating oil liquid is passed in tank body from three-phase fluid pipe;
(2) due to the effect of gravity, fluid-mixing liquid phase in tank body is separated, be divided into three layers, be respectively lubricating oil liquid, worker quality liquid and Working medium gas from bottom to top, described lubricating oil liquid enters escape pipe from oil-out and circulates, the flow velocity of described governor valve control lubricating oil liquid, described worker quality liquid is discharged from liquid outlet, and described Working medium gas is discharged from gas vent;
(3) liquid outlet and oil-out pressure differential Δ p is detected, as Δ p=ρ
pAG(T), during g Δ H, judge that the interface of lubricating oil liquid and worker quality liquid is higher than described liquid outlet, increases the aperture of control valve;
As Δ p≤ρ
working medium _ Liquid(T) g Δ H, judges that the interface of lubricating oil liquid and worker quality liquid is lower than described oil-out, reduces the aperture of control valve;
Wherein,
ρ
pAG(T) be lubricating oil density, unit is kg/m
3, be the function of temperature T;
ρ
working medium _ Liquid(T) be the density of worker quality liquid, unit is kg/m
3, be the function of temperature T;
Δ H is described liquid outlet and described oil-out difference in height in vertical direction;
T is gas-liquid separator internal temperature, and unit is K;
G is local gravitational acceleration, and unit is m/s
2.
Above-mentioned control method is simple, effectively, sensor cluster can adopt two pressure sensors, measures the pressure of liquid outlet and oil-out respectively, and then obtains pressure differential.
The inventive method utilizes the lamination of lubricating oil liquid and worker quality liquid, by liquid outlet and the distribution of oil-out height, and determine interface by observing or detecting, and then pass through the flow velocity of governor valve control lubricating oil liquid, realize controlling lubrication oil circulation amount, improve stability and the heat exchange efficiency of the refrigeration/heat pump system using gas-liquid separator of the present invention.
When system stable operation, the lubricating oil liquid in tank body and worker quality liquid interface should between liquid outlet and oil-out place planes, and described interface should be positioned at more than oil-out place plane.Now, pressure differential Δ p meets relational expression:
ρ
pAG(T) g Δ H> Δ p> ρ
working medium _ Liquid(T) g Δ H
In system cloud gray model, if the flow velocity of lubricating oil liquid is too small, lubricating oil liquid is at tank body accumulation, and described interface will cross liquid outlet, and a large amount of lubricating oil is by the evaporimeter of the system of entering, and influential system normally runs, and now sensor cluster will detect Δ p=ρ
pAG(T) g Δ H, and by signal feedback to control valve, valve opening increases, described interface declines.
If lubricating oil rate of flow of fluid is excessive, a large amount of worker quality liquid can be caused to enter blast pipe with lubricating oil liquid by oil-out, in tank body, lubricating oil liquid can not be had.Now sensor will detect Δ p≤ρ
working medium _ Liquid(T) g Δ H by signal feedback to control valve, valve opening reduces, and reduces lubricating oil rate of flow of fluid, makes again to store lubricating oil liquid in tank body.
When sensor cluster detects ρ
pAG(T) g Δ H> Δ p> ρ
working medium _ Liquid(T) g Δ H, control valve quits work, and valve keeps existing aperture constant, and systematic steady state runs.
Beneficial effect of the present invention:
Structure of gas liquid separator of the present invention is simple, in conjunction with control method of the present invention, can facilitate, effectively control lubrication oil circulation amount, improves stability and the heat exchange efficiency of the refrigeration/heat pump system using gas-liquid separator of the present invention.
Accompanying drawing explanation
Fig. 1 is structure of gas liquid separator schematic diagram of the present invention.
Fig. 2 is the carbon dioxide compression formula heat pump cycle flow chart applying band injector of the present invention.
Detailed description of the invention
As shown in Figure 1, the gas-liquid separator of the present embodiment comprises: tank body 2, from the three-phase fluid pipe 1 that tank body 2 top enters, the drain pipe 3 entered bottom tank body 2, be located at the gas vent 8 at tank body 2 top, the U-tube 6 that upper port is connected with gas vent 8, be located at the oil-out 4 be connected bottom tank body 2 and with the U-shaped crook of U-tube 6, control the control valve 5 of oil-out 4 flow, and be positioned at the liquid filtering layer 7 below gas vent 8; U-shapedly curvedly be oil return section, the petroleum pipeline at control valve 5 place is horizontal by the inclination angle of 5 °, and liquid filtering layer 7 effect is the little liquid pearl in removing gas-liquid separator upper gaseous phase, strengthening gas-liquid separation effect; The liquid outlet place of drain pipe 3 is provided with pressure sensor 14, and oil-out 4 place is provided with pressure sensor 15.
The outlet of three-phase fluid pipe 1 enters 1/4th of tank body 2 total height, and the liquid outlet of drain pipe 3 enters 1/4th of tank body 2 total height.
Refrigeration/heat pump system generally comprises the compression unit, condensing unit, restricting element and the evaporation element that are connected by working medium circulation, during the present embodiment application, be arranged between evaporation element and compression unit, wherein, evaporation element provides fluid-mixing to three-phase fluid pipe 1, worker quality liquid is delivered to the inlet of evaporation element by drain pipe 3, and U-tube 6 (escape pipe) is connected with the import of compression unit.
Now the present embodiment is applied on the carbon dioxide compression formula heat pump of band injector, circulation process as shown in Figure 2, the gas-liquid separator connected successively, compressor 9, gas cooler 10, injector 11; The three-phase fluid pipe 1 of gas-liquid separator connects the port of export of injector 11, the drain pipe 3 of gas-liquid separator connects choke valve 13, choke valve 13 connects evaporimeter 12, the outlet of evaporimeter 12 is connected with the import of injector 11, the outlet of the U-tube 6 of gas-liquid separator is connected with compressor 9, and the loop direction of working medium as shown by arrows.
In the present embodiment, the working medium of heat pump adopts carbon dioxide, during operation, the fluid-mixing of carbon dioxide, liquid and lubricating oil liquid exports from injector 11 and flows out, tank body 2 is entered through three-phase fluid pipe 1, fluid is separated because of filtration liquid phase in tank body 2 of gravity and liquid filtering layer 7, is finally divided into three layers.Orlop is undissolved lubricating oil liquid in system, and intermediate layer is the saturated solution of carbon dioxide liquid and lubricating oil, the superiors are carbon dioxide.
When systematic steady state runs, drain pipe 3 is communicated with the saturated solution layer of lubricating oil with carbon dioxide liquid; Oil-out 4 is connected with lube layer; Gas vent 8 is connected with carbon dioxide layer; Carbon dioxide liquid in tank body 2 and the saturated solution of lubricating oil flow through choke valve 13 by drain pipe 3, enter evaporimeter 12 after throttling, are entrainmented into injector afterwards by the high-pressure fluid flowed out from air cooler 10, then flow into tank body 2 and complete circulation; Lubricating oil liquid in tank body 2 due to Action of Gravity Field from oil-out 4 flow out through control valve 5 be collected at U-tube 6 U-shaped curved in, carbon dioxide in tank body 2 enters U-tube by gas vent 8, U-shaped curved interior lubricating oil liquid is driven to enter compressor 9 together, after compressor compression, enter air cooler 10 cool, enter injector 11 again and entrainment the low-pressure fluid flowed out from evaporimeter 12, finally enter tank body 2 together and complete circulation.
In the present embodiment, carbon dioxide and lubricating oil are completed by gas-liquid separator and are separated, the saturated solution of carbon dioxide and lubricating oil is only had to enter evaporimeter 12, make cloth liquid in evaporimeter 12 even, strengthen exchange capability of heat, control lubrication oil circulation amount make system can keep stable operation, the harmful effect that the lubrication oil circulation amount easily produced when avoiding using common gas-liquid separator is too much or very few when variable working condition or compressor variable frequency by changing control valve 5 aperture.
The automatic control of control valve 5 is realized by pressure sensor 14 and pressure sensor 15, and the distance between the liquid outlet place plane of drain pipe 3 and oil-out 4 place plane is Δ H, and pressure reduction is Δ p, and the detailed process of control is as follows:
The difference Δ p of pressure is recorded by pressure sensor 14 and pressure sensor 15;
When system stable operation, lubricating oil liquid and carbon dioxide liquid interface should between the liquid outlet place plane of drain pipe 3 and oil-out 4 place planes, carbon dioxide gas-liquid interface should be positioned at above the liquid outlet of drain pipe 3, and now, Δ p meets relational expression:
ρ
PAG(T)gΔH>Δp>ρ
CO2_Liquid(T)gΔH
In formula,
ρ
pAG(T) be lubricating oil density, kg/m
3, be the function of temperature T;
ρ
cO2_Liquid(T) be the density of carbon dioxide and lubricating oil saturated solution, kg/m
3, be the function of temperature T;
T is gas-liquid separator internal temperature, K;
G is local gravitational acceleration, m/s
2.
In system cloud gray model, if the flow velocity of lubricating oil is too small, lubricating oil liquid and carbon dioxide liquid interface by be positioned at drain pipe 3 liquid outlet place plane more than, a large amount of lubricating oil liquid will enter evaporimeter, influential system normally runs, and now two sensors will detect Δ p=ρ
pAG(T) g Δ H, and by signal feedback to electronic regulated valve 5, by-pass valve control aperture increases, and fluid interface is declined.
If the flow velocity of lubricating oil is excessive, great amount of carbon dioxide liquid can be caused to enter compressor 9 with lubricating oil together by oil-out 4, and can not there be lubricating oil liquid gas-liquid separator inside, and now two sensors will detect Δ p≤ρ
cO2_Liquid(T) g Δ H by signal feedback to electronic regulated valve 5, by-pass valve control aperture reduces, and lubricating oil flow velocity declines, and makes again to accumulate lubricating oil in gas-liquid separator.
When two pressure sensors detect ρ
pAG(T) g Δ H> Δ p> ρ
cO2_Liquid(T) g Δ H, control valve quits work, and valve keeps existing aperture constant, and systematic steady state runs.
In sum, when applying the refrigeration/heat pump system operation of the present embodiment, lubrication oil circulation amount effectively can be avoided too much or very few, ensure refrigeration/heat pump system stable operation and there is higher heat exchange efficiency.
Claims (8)
1. one kind can control the gas-liquid separator of lubrication oil circulation amount, comprise tank body, stretch into the three-phase fluid pipe of tank body, be arranged on the gas vent on tank body top, be arranged on liquid outlet and the oil-out of tank body lower part, described gas vent is connected with escape pipe, described escape pipe comprises in vertical direction not higher than the oil return section of oil-out, it is characterized in that, described oil return section is communicated with by petroleum pipeline with between oil-out, described petroleum pipeline is provided with the control valve controlling flow, and described liquid outlet is in vertical direction higher than described oil-out;
Described gas-liquid separator also comprises the pressure differential of the described liquid outlet of detection and oil-out place plane to control to adjust the sensor cluster of valve opening.
2. can control the gas-liquid separator of lubrication oil circulation amount as claimed in claim 1, it is characterized in that, described petroleum pipeline relative level face tilt is arranged, and described oil-out is positioned at higher-end.
3. can control the gas-liquid separator of lubrication oil circulation amount as claimed in claim 2, it is characterized in that, the angle of inclination in described petroleum pipeline relative level face is 5 ° ~ 10 °.
4. the gas-liquid separator of the controlled lubrication oil circulation amount as described in claim as arbitrary in claims 1 to 3, it is characterized in that, described oil-out is arranged on the bottom of tank body, described liquid outlet is positioned on the horizontal level of 1/4 ~ 1/3 of described tank body total height, and the outlet of described three-phase fluid pipe is positioned on the horizontal level of 2/3 ~ 3/4 of described tank body total height.
5. can control the gas-liquid separator of lubrication oil circulation amount as claimed in claim 4, it is characterized in that, the drain pipe that described liquid outlet connects stretches out tank body from the bottom of tank body.
6. the gas-liquid separator of the controlled lubrication oil circulation amount as described in claim as arbitrary in claims 1 to 3, is characterized in that, the oil return section of described escape pipe is positioned at tank body outside.
7. the gas-liquid separator of the controlled lubrication oil circulation amount as described in claim as arbitrary in claims 1 to 3, it is characterized in that, the outlet of described three-phase fluid pipe, in vertical direction lower than described gas vent, is provided with the liquid filtering layer between the outlet and described gas vent of described three-phase fluid pipe in described tank body.
8. a lubrication oil circulation amount control method for gas-liquid separator, is characterized in that, uses the gas-liquid separator of the controlled lubrication oil circulation amount as described in claim as arbitrary in claim 1 ~ 7, comprises the following steps:
(1) fluid-mixing comprising Working medium gas, worker quality liquid and lubricating oil liquid is passed in tank body from three-phase fluid pipe;
(2) due to the effect of gravity, fluid-mixing liquid phase in tank body is separated, be divided into three layers, be respectively lubricating oil liquid, worker quality liquid and Working medium gas from bottom to top, described lubricating oil liquid enters escape pipe from oil-out and circulates, the flow velocity of described governor valve control lubricating oil liquid, described worker quality liquid is discharged from liquid outlet, and described Working medium gas is discharged from gas vent;
(3) liquid outlet and oil-out pressure differential Δ p is detected, as Δ p=ρ
pAG(T), during g Δ H, judge that the interface of lubricating oil liquid and worker quality liquid is higher than described liquid outlet, increases the aperture of control valve;
As Δ p≤ρ
working medium _ Liquid(T) g Δ H, judges that the interface of lubricating oil liquid and worker quality liquid is lower than described oil-out, reduces the aperture of control valve;
Wherein,
ρ
pAG(T) being lubricating oil density, is the function of temperature T;
ρ
working medium _ Liquid(T) being the density of worker quality liquid, is the function of temperature T;
Δ H is described liquid outlet and described oil-out difference in height in vertical direction;
T is gas-liquid separator internal temperature;
G is local gravitational acceleration.
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|---|---|---|---|
| CN201510499533.3A CN105115204B (en) | 2015-08-14 | 2015-08-14 | The gas-liquid separator and control method of a kind of controllable lubrication oil circulation amount |
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|---|---|---|---|
| CN201510499533.3A CN105115204B (en) | 2015-08-14 | 2015-08-14 | The gas-liquid separator and control method of a kind of controllable lubrication oil circulation amount |
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| CN105115204B CN105115204B (en) | 2017-08-08 |
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ID=54663252
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| CN106369897A (en) * | 2016-08-30 | 2017-02-01 | 芜湖三花制冷配件有限公司 | Novel oil separator |
| CN109028656A (en) * | 2018-07-04 | 2018-12-18 | 青岛海信日立空调系统有限公司 | A kind of control method and device of heat pump |
| CN109357449A (en) * | 2018-10-29 | 2019-02-19 | 中国科学院理化技术研究所 | Gas-liquid separator and refrigeration/heat pump system |
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| CN105115204B (en) | 2017-08-08 |
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