CN105115204B - The gas-liquid separator and control method of a kind of controllable lubrication oil circulation amount - Google Patents
The gas-liquid separator and control method of a kind of controllable lubrication oil circulation amount Download PDFInfo
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- CN105115204B CN105115204B CN201510499533.3A CN201510499533A CN105115204B CN 105115204 B CN105115204 B CN 105115204B CN 201510499533 A CN201510499533 A CN 201510499533A CN 105115204 B CN105115204 B CN 105115204B
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Abstract
The invention discloses a kind of gas-liquid separator of controllable lubrication oil circulation amount, including tank body, stretch into the three-phase fluid pipe of tank body, it is arranged on the gas vent on tank body top, it is arranged on the liquid outlet and oil-out of tank body lower part, the gas vent is connected with escape pipe, the escape pipe includes being not higher than the oil return section of oil-out in vertical direction, the oil return section between oil-out by petroleum pipeline with being connected, regulating valve of the petroleum pipeline provided with control flow, the liquid outlet is higher than the oil-out in vertical direction；The invention also discloses a kind of lubrication oil circulation amount control method of gas-liquid separator；Structure of gas liquid separator of the invention is simple, with reference to control method of the invention, can facilitate, effectively control lubrication oil circulation amount, improves the stability and heat exchange efficiency for the refrigeration/heat pump system for using gas-liquid separator of the invention.
Description
Technical field
The present invention relates to refrigeration and technical field of heat pumps, more particularly to a kind of gas-liquid separation of controllable lubrication oil circulation amount
Device and control method.
Background technology
In carbon dioxide refrigeration/art of heat pumps, gas-liquid separator is capable of the refrigerant of storage system interior section, prevents
Compressor liquid machine and expansion power system capacity, regulating system pressure etc..Common carbon dioxide gas-liquid separator is main by tank body, two
Phase fluid entrance, blast pipe, liquid outlet composition.Wherein two-phase fluid entrance is located in the middle part of tank body, and liquid outlet is located at tank base.
The air inlet of blast pipe is located at tank interior, and one end is located at tank body top as gas vent in tank, and the other end connects tank body, row
There is a fixed-size aperture bottom of tracheae as oil outlet, positioned at tank base.
In compression carbon dioxide refrigeration/heat pump, due to good compatibility, PAG often is used as compressor
Lubricating oil, and PAG lubricating oil can not dissolve each other completely with carbon dioxide in system.During operation, it is impossible to which the lubricating oil of dissolving can be with
Carbon dioxide in system interior circulation, excessive lubricating oil can cause heat exchanger heat exchange efficiency to decline, so as to be caused to system COP
Serious negative effect, and lubricants capacity deficiency can then cause compressor exhaust temperature rising, compressor efficiency decline etc. bad
Influence, even compressor is damaged when serious.
But in existing carbon dioxide refrigeration/heat pump operation, because density is larger, it is impossible to the lubricating oil of dissolving
Gas-liquid separator bottom can be accumulated in, common gas-liquid separator in the oil outlet of blast pipe by making lubricating oil return to compression
Machine, to keep the steady-state operation of system, but it does not possess the control function to oil return line, and system oil internal circulating load and carbon dioxide
Mass flow is relevant, can change with the change of operating mode, during especially with frequency-changeable compressor, oily internal circulating load will be with compressor
Frequency shift and change, when oily internal circulating load increase, systematic steady state run when, gas-liquid separator bottom lubricating oil burden can also increase
Greatly, this will cause a large amount of lubricating oil to enter evaporator with carbon dioxide liquid, reduce evaporator heat exchange efficiency；Similarly, oil is worked as
Internal circulating load reduces, and gas-liquid separator bottom lubricating oil burden reduces, and causes excess carbon dioxide liquid going out by blast pipe
Oilhole, enters compressor with carbon dioxide, causes compressor inlet band liquid.
Therefore, oily internal circulating load raising systematic entirety in optimization carbon dioxide refrigeration/heat pump how is enable to become ten
Divide important.
The content of the invention
The invention provides a kind of gas-liquid separator of controllable lubrication oil circulation amount, can effectively optimize liquid refrigerant and
The cyclic process of lubricating oil, improves the heat exchange efficiency and operation stability of refrigeration/heat pump system.
A kind of gas-liquid separator of controllable lubrication oil circulation amount, including tank body, stretch into the three-phase fluid pipe of tank body, set
Gas vent on tank body top, is arranged on the liquid outlet and oil-out of tank body lower part, and the gas vent is connected with escape pipe,
The escape pipe includes being not higher than the oil return section of oil-out in vertical direction, and oil transportation is passed through between the oil return section and oil-out
Pipe is connected, and regulating valve of the petroleum pipeline provided with control flow, the liquid outlet is higher than the oil-out in vertical direction；
The gas-liquid separator also includes the pressure differential of plane where detecting the liquid outlet and oil-out to control to adjust
The sensor cluster of valve opening.
The present invention is less than the refrigeration/heat pump system of the density of lubricating oil liquid, such as two suitable for the density of worker quality liquid
Carbonoxide refrigeration/heat pump system, using carbon dioxide as working medium, oil-out is arranged on the lower section of liquid outlet by the present invention, leads to
The worker quality liquid and lubricating oil liquid for setting two liquid outlets to carry out partition density difference and be layered in tank body are crossed, and passes through tune
Save the control of valve, it is ensured that lubricating oil liquid enters blast pipe from oil-out, and worker quality liquid is discharged from liquid outlet, so as to avoid pressure
The problem of contracting machine import band liquid and lubricating oil enter system circulation heat exchange reduction heat exchange efficiency.
Sensor cluster by detect the pressure differential of the plane where the liquid outlet and oil-out of the liquid in tank body come
Judge the interface location of worker quality liquid and lubricating oil liquid, so as to control to adjust valve opening, realize control lubricating oil liquid
Flow, it is to avoid in tank body lubricating oil excessively into liquid outlet or lubricating oil liquid it is very few and cause worker quality liquid enter it is fuel-displaced
Mouthful.
In order that lubricating oil liquid can be discharged smoothly, it is preferred that the petroleum pipeline relative level is obliquely installed, described
Oil-out is located at higher-end.
In order to better control over the flow of lubricating oil liquid, the angle of inclination of the petroleum pipeline is unsuitable excessive, preferably
, the angle of inclination of the petroleum pipeline relative level is 5 °~10 °.Above-mentioned angle can be such that lubricating oil liquid smoothly discharges,
And flow velocity will not be very big, it is easy to pass through governor valve control and regulation flow velocity.
In order that the fluid-mixing including Working medium gas, worker quality liquid and lubricating oil liquid can in tank body more preferable score
From, it is preferred that the oil-out is arranged on the bottom of tank body, and the liquid outlet is located at the 1/4~1/3 of the tank body total height
On horizontal level, the outlet of the three-phase fluid pipe is on 2/3~3/4 horizontal level of the tank body total height.It is above-mentioned
The middle and upper part that fluid-mixing is passed through to tank body is set, so as to fully spread whole tank body, accelerates layering；And liquid outlet is with going out
Hydraulic fluid port difference in height is larger, so that worker quality liquid and lubricating oil liquid have enough mobile spaces, control and regulation lubricating oil
The flow rates of liquid are big.
In order that worker quality liquid quickly flows out tank body, it is preferred that the drain pipe of liquid outlet connection is from the bottom of tank body
Stretch out tank body.
For the ease of manufacture, install and maintenance, it is preferred that the oil return section of the escape pipe is located at outside tank body.
In order to improve the effect of fluid-mixing gas-liquid separation, it is preferred that the outlet of the three-phase fluid pipe is in vertical direction
It is upper to be less than between outlet and the gas vent for being provided with the gas vent, the tank body and being located at the three-phase fluid pipe
Liquid filter layer.Fluid-mixing enters after tank body, and Working medium gas, which rises through, to be entered back into gas after the filtering of liquid filter layer and go out
Mouthful, effectively improve the separating effect of Working medium gas.
The liquid filter layer typically uses 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, can be with
The control to lubrication oil circulation amount is effectively realized, so as to ensure refrigeration/heat pump system stable operation and be imitated with higher heat exchange
Rate.
A kind of lubrication oil circulation amount control method of gas-liquid separator, uses the gas of above-mentioned controllable lubrication oil circulation amount
Liquid/gas separator, comprises the following steps：
(1) fluid-mixing including Working medium gas, worker quality liquid and lubricating oil liquid is passed through tank body from three-phase fluid pipe
It is interior；
(2) due to the effect of gravity, fluid-mixing gas-liquid in tank body is separated, and is divided into three layers, is respectively from bottom to top
Lubricating oil liquid, worker quality liquid and Working medium gas, the lubricating oil liquid are circulated from oil-out into escape pipe, described
The flow velocity of governor valve control lubricating oil liquid, the worker quality liquid is discharged from liquid outlet, and the Working medium gas is arranged from gas vent
Go out；
(3) detection liquid outlet and oil-out pressure differential Δ p, as Δ p=ρPAG(T) during g Δs H, lubricating oil liquid and work are judged
The interface of matter liquid is higher than the liquid outlet, increases the aperture of regulating valve；
As Δ p≤ρWorking medium _ Liquid(T) interface of g Δs H, judgement lubricating oil liquid and worker quality liquid is less than described fuel-displaced
Mouthful, reduce the aperture of regulating valve；
Wherein,
ρPAG(T) it is lubrication oil density, unit is kg/m3, it is temperature T function；
ρWorking medium _ Liquid(T) it is the density of worker quality liquid, unit is kg/m3, it is temperature T function；
Δ H is the difference in height of the liquid outlet and the oil-out in vertical direction；
T is gas-liquid separator internal temperature, and unit is K；
G is local gravitational acceleration, and unit is m/s2。
Above-mentioned control method is simple, effective, and sensor cluster can measure liquid outlet respectively using two pressure sensors
With the pressure of oil-out, and then pressure differential is obtained.
The inventive method is divided liquid outlet and oil-out height using the lamination of lubricating oil liquid and worker quality liquid
Cloth, and interface is determined by observing or detecting, and then by the flow velocity of governor valve control lubricating oil liquid, realize to lubricating oil
Internal circulating load is controlled, and improves the stability and heat exchange efficiency of the refrigeration/heat pump system for using the gas-liquid separator of the present invention.
In system stable operation, the lubricating oil liquid in tank body should be located at liquid outlet and fuel-displaced with worker quality liquid interface
Between plane where mouthful, where the interface should be located at oil-out more than plane.Now, pressure differential Δ p meets relational expression：
ρPAG(T)gΔH>Δp>ρWorking medium _ Liquid(T)gΔH
In system operation, if the flow velocity of lubricating oil liquid is too small, lubricating oil liquid is accumulated in tank body, and the interface will
Liquid outlet is crossed, a large amount of lubricating oil will enter the evaporator of system, and influence system is normally run, now sensor cluster will be detected
To Δ p=ρPAG(T) g Δs H, and signal is fed back into regulating valve, valve opening increase, the interface declines.
If lubricating oil rate of flow of fluid is excessive, a large amount of worker quality liquids can be caused to enter with lubricating oil liquid by oil-out
Will not there be lubricating oil liquid in blast pipe, tank body.Now sensor will detect Δ p≤ρWorking medium _ Liquid(T) g Δs H and general
Signal feeds back to regulating valve, and valve opening reduces, and reduces lubricating oil rate of flow of fluid, makes to store lubricating oil liquid in tank body again.
When sensor cluster detects ρPAG(T)gΔH>Δp>ρWorking medium _ Liquid(T) g Δs H, regulating valve is stopped, valve
Keep existing aperture constant, systematic steady state operation.
Beneficial effects of the present invention：
The structure of gas liquid separator of the present invention simply, with reference to the control method of the present invention, can facilitate, effectively control lubricates
Oily internal circulating load, improves the stability and heat exchange efficiency for the refrigeration/heat pump system for using the gas-liquid separator of the present invention.
Brief description of the drawings
Fig. 1 is structure of gas liquid separator schematic diagram of the invention.
Fig. 2 is the carbon dioxide compression formula heat pump cycle flow chart with injector of the application present invention.
Embodiment
As shown in figure 1, the gas-liquid separator of the present embodiment includes：Tank body 2, the three-phase fluid pipe entered from the top of tank body 2
1, the drain pipe 3 entered from the bottom of tank body 2, the gas vent 8 located at the top of tank body 2, the U that upper port is connected with gas vent 8
Type pipe 6, the oil-out 4 being connected located at the bottom of tank body 2 and with the U-shaped crook of U-tube 6 controls the regulating valve 5 of the flow of oil-out 4,
And the liquid filter layer 7 positioned at the lower section of gas vent 8；U-shaped curved as oil return section, petroleum pipeline and level where regulating valve 5
Face is in 5 ° of inclination angle, and the effect of liquid filter layer 7 is to remove the small liquid pearl in gas-liquid separator upper gaseous phase, reinforcing gas-liquid separation effect
Really；It is provided with the liquid outlet of drain pipe 3 at pressure sensor 14, oil-out 4 and is provided with pressure sensor 15.
The outlet of three-phase fluid pipe 1 enters a quarter of the total height of tank body 2, and the liquid outlet of drain pipe 3 is total into tank body 2
The a quarter of height.
Refrigeration/heat pump system generally comprise the compression unit connected by working medium circulation, condensing unit, restricting element and
Evaporation element, when the present embodiment is applied, between evaporation element and compression unit, wherein, evaporation element is to three-phase fluid
Pipe 1 provides fluid-mixing, and worker quality liquid is delivered to the inlet of evaporation element, U-tube 6 (escape pipe) and compression by drain pipe 3
The import connection of unit.
Now exemplified by the present embodiment to be applied on the carbon dioxide compression formula heat pump with injector, circulation process such as Fig. 2
Gas-liquid separator, compressor 9, gas cooler 10, injector 11 shown, be sequentially connected；The three-phase fluid of gas-liquid separator
Pipe 1 connects the port of export of injector 11, and the connection choke valve 13 of drain pipe 3 of gas-liquid separator, choke valve 13 connects evaporator 12,
The outlet of evaporator 12 is connected with the import of injector 11, and the outlet of the U-tube 6 of gas-liquid separator is connected with compressor 9, working medium
Loop direction it is as shown by arrows.
In the present embodiment, the working medium of heat pump uses carbon dioxide, during operation, carbon dioxide, liquid and lubrication
The fluid-mixing of fluid body is exported from injector 11 to flow out, and enters tank body 2 through three-phase fluid pipe 1, fluid is because of gravity and liquid
The filtration of filter layer 7 gas-liquid in tank body 2 is separated, and is finally divided into three layers.Orlop is undissolved lubrication in system
Fluid body, intermediate layer is that the saturated solution of carbon dioxide liquid and lubricating oil, the superiors are carbon dioxide.
When systematic steady state is run, drain pipe 3 is connected with carbon dioxide liquid with the saturated solution layer of lubricating oil；Oil-out
4 are connected with lube layer；Gas vent 8 is connected with carbon dioxide layer；Carbon dioxide liquid and lubricating oil in tank body 2
Saturated solution flows through choke valve 13 by drain pipe 3, and evaporator 12, the high pressure flowed out afterwards from air cooler 10 are entered after throttling
Fluid rolls up inspiration injector, then flows into the completion circulation of tank body 2；Lubricating oil liquid in tank body 2 is because Action of Gravity Field is from oil-out 4
Outflow is collected at the U-shaped curved interior of U-tube 6 by regulating valve 5, and the carbon dioxide in tank body 2 enters U by gas vent 8
Type pipe, drives U-shaped curved interior lubricating oil liquid to enter compressor 9 together, is cooled down after being compressed through compressor into air cooler 10, then
The low-pressure fluid flowed out into injector suctions of volume 11 from evaporator 12, finally enters tank body 2 and completes circulation together.
In the present embodiment, carbon dioxide completes to separate with lubricating oil by gas-liquid separator, only carbon dioxide and lubrication
The saturated solution of oil enters evaporator 12, cloth liquid in evaporator 12 uniformly, exchange capability of heat is strengthened, by changing regulating valve 5
Aperture controls the lubrication oil circulation amount to enable system to keep stable operation in variable working condition or compressor variable frequency, it is to avoid make
The excessive or very few harmful effect of the lubrication oil circulation amount that is also easy to produce during with common gas-liquid separator.
Automatically controlling for regulating valve 5 realized by pressure sensor 14 and pressure sensor 15, the liquid outlet institute of drain pipe 3
Distance between plane and the place plane of oil-out 4 is Δ H, and pressure difference is Δ p, and the detailed process of control is as follows：
The difference Δ p of pressure is measured by pressure sensor 14 and pressure sensor 15；
In system stable operation, lubricating oil liquid should be located at the liquid outlet of drain pipe 3 with carbon dioxide liquid interface
Between place plane and the place plane of oil-out 4, carbon dioxide gas-liquid interface should be located above the liquid outlet of drain pipe 3, this
When, Δ p meets relational expression：
ρPAG(T)gΔH>Δp>ρCO2_Liquid(T)gΔH
In formula,
ρPAG(T) it is lubrication oil density, kg/m3, it is temperature T function；
ρCO2_Liquid(T) it is the density of carbon dioxide and lubricating oil saturated solution, kg/m3, it is temperature T function；
T is gas-liquid separator internal temperature, K；
G is local gravitational acceleration, m/s2。
In system operation, if the flow velocity of lubricating oil is too small, lubricating oil liquid will be located at carbon dioxide liquid interface
Where the liquid outlet of liquid pipe 3 more than plane, a large amount of lubricating oil liquid will enter evaporator, and influence system normally be run, and now two
Individual sensor will detect Δ p=ρPAG(T) g Δs H, and signal is fed back into electronic regulated valve 5, the increase of control valve aperture makes
Fluid interface declines.
If the flow velocity of lubricating oil is excessive, can cause great amount of carbon dioxide liquid with lubricating oil by oil-out 4 together
Into compressor 9, will not have lubricating oil liquid inside gas-liquid separator, now two sensors will detect Δ p≤
ρCO2_Liquid(T) g Δs H and signal is fed back into electronic regulated valve 5, control valve aperture reduces, and lubrication oil flow rate declines, and makes gas
Again lubricating oil is accumulated in liquid/gas separator.
When two pressure sensors detect ρPAG(T)gΔH>Δp>ρCO2_Liquid(T) g Δs H, regulating valve is stopped,
Valve keeps existing aperture constant, systematic steady state operation.
In summary, when applying the refrigeration/heat pump system operation of the present embodiment, it is possible to prevente effectively from lubrication oil circulation amount
It is excessive or very few, it is ensured that refrigeration/heat pump system stable operation and with higher heat exchange efficiency.
Claims (8)
1. a kind of gas-liquid separator of controllable lubrication oil circulation amount, including tank body, stretch into the three-phase fluid pipe of tank body, are arranged on
The gas vent on tank body top, is arranged on the liquid outlet and oil-out of tank body lower part, and the gas vent is connected with escape pipe, institute
Stating escape pipe includes being not higher than the oil return section of oil-out in vertical direction, it is characterised in that oil return section and oil-out it
Between connected by petroleum pipeline, regulating valve of the petroleum pipeline provided with control flow, the liquid outlet is higher than in vertical direction
The oil-out；
The pressure differential that the gas-liquid separator also includes plane where detecting the liquid outlet and oil-out is opened with controlling to adjust valve
The sensor cluster of degree.
2. the gas-liquid separator of lubrication oil circulation amount is can control as claimed in claim 1, it is characterised in that the petroleum pipeline phase
Horizontal plane is set, the oil-out is located at higher-end.
3. the gas-liquid separator of lubrication oil circulation amount is can control as claimed in claim 2, it is characterised in that the petroleum pipeline phase
Angle of inclination to horizontal plane is 5 °~10 °.
4. the gas-liquid separator of the controllable lubrication oil circulation amount as described in claims 1 to 3 any claim, its feature exists
In the oil-out is arranged on the bottom of tank body, and the liquid outlet is located at 1/4~1/3 horizontal position of the tank body total height
Put, the outlet of the three-phase fluid pipe is on 2/3~3/4 horizontal level of the tank body total height.
5. the gas-liquid separator of lubrication oil circulation amount is can control as claimed in claim 4, it is characterised in that the liquid outlet connects
The drain pipe connect stretches out tank body from the bottom of tank body.
6. the gas-liquid separator of the controllable lubrication oil circulation amount as described in claims 1 to 3 any claim, its feature exists
In the oil return section of the escape pipe is located at outside tank body.
7. the gas-liquid separator of the controllable lubrication oil circulation amount as described in claims 1 to 3 any claim, its feature exists
In the outlet of the three-phase fluid pipe, which is less than to be provided with the gas vent, the tank body in vertical direction, is located at described three
Liquid filter layer between the outlet of phase fluid pipe and the gas vent.
8. the lubrication oil circulation amount control method of a kind of gas-liquid separator, it is characterised in that any using such as claim 1~7
The gas-liquid separator of controllable lubrication oil circulation amount described in claim, comprises the following steps：
(1) fluid-mixing including Working medium gas, worker quality liquid and lubricating oil liquid is passed through in tank body from three-phase fluid pipe；
(2) due to the effect of gravity, fluid-mixing gas-liquid in tank body is separated, and is divided into three layers, is respectively to lubricate from bottom to top
Fluid body, worker quality liquid and Working medium gas, the lubricating oil liquid are circulated from oil-out into escape pipe, the regulation
Valve controls the flow velocity of lubricating oil liquid, and the worker quality liquid is discharged from liquid outlet, and the Working medium gas is discharged from gas vent；
(3) detection liquid outlet and oil-out pressure differential Δ p, as Δ p=ρPAG(T) during g Δs H, lubricating oil liquid and working medium liquid are judged
The interface of body is higher than the liquid outlet, increases the aperture of regulating valve；
As Δ p≤ρWorking medium _ Liquid(T) g Δs H, judges that the interface of lubricating oil liquid and worker quality liquid is less than the oil-out, reduces
The aperture of regulating valve；
Wherein,
ρPAG(T) it is lubrication oil density, is temperature T function；
ρWorking medium _ Liquid(T) it is the density of worker quality liquid, is temperature T function；
Δ H is the difference in height of the liquid outlet and the oil-out in vertical direction；
T is gas-liquid separator internal temperature；
G is local gravitational acceleration.
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN109028656B (en) * | 2018-07-04 | 2020-12-08 | 青岛海信日立空调系统有限公司 | Control method and device for 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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