CN109237829A - Compression refrigerating machine - Google Patents
Compression refrigerating machine Download PDFInfo
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- CN109237829A CN109237829A CN201810637423.2A CN201810637423A CN109237829A CN 109237829 A CN109237829 A CN 109237829A CN 201810637423 A CN201810637423 A CN 201810637423A CN 109237829 A CN109237829 A CN 109237829A
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- liquid
- gas
- refrigerant
- separation container
- liquid separation
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/053—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
Compression refrigerating machine provided by the invention has: gas-liquid separation container (30), and from evaporator (3) recycling refrigerant and gas-liquid separation for refrigerant gas and contains the refrigerant liquid of lubricating oil；Liquid refrigerant recycling piping (P1), the liquid outflow portion (L1) of evaporator (3) is connect with the liquid inflow part of gas-liquid separation container (30)；Discharge piping (31), is expelled to displacer (20) from gas-liquid separation container (30) by the refrigerant liquid containing lubricating oil；Level detection sensors device (32) detects the liquid level in gas-liquid separation container (30)；Dump valve (Vd) is set to discharge piping (31), and is opened and closed according to the liquid level in gas-liquid separation container (30)；The gas phase portion of gas-liquid separation container (30) is connect by gas phase portion connecting pipings (33) with the gas phase portion of evaporator (3).
Description
Technical field
The present invention relates to the compression refrigerating machines for having evaporator, compressor and condenser, stagnant more particularly to recycling
The refrigerant containing lubricating oil in evaporator is stayed, and its gas-liquid separation for refrigerant gas and is contained into the refrigeration of lubricating oil
Agent liquid, and the refrigerant liquid containing lubricating oil is only recycled to the compression refrigerating machine of oil tank.
Background technique
The compression refrigerating machines such as centrifugal refrierator are built-in with: being supported the bearing of high-speed rotary body, passed to high-speed rotary body
The booster engine of torque delivery.Fever at bearing and booster engine is equivalent to mechanical loss, thus in order to lubricate above-mentioned bearing and
Booster engine, and cooling bearing and booster engine, and supply with the lubricating oil with freon series coolant intermiscibility and maintain
Lubrication and refrigerating function.Oil is leaked to refrigerant system in order to prevent, and keeping the oil tank of lubricating oil using balance pipe, (oil tank is pressed
Pipe) in the low-pressure section counterpressure of centrifugal refrierator.
However, can not avoid a part of lubricating oil via the axle envelope part of rotary body, above-mentioned balance pipe completely, (oil tank is pressed
Pipe) leak to refrigerant system.If lubricating oil continues to the leakage of refrigerant system, the lubricating oil that oil tank is possessed is reduced,
It can not be to bearing and booster engine fuel feeding, so that the operating of compression refrigerating machine can not be continued.Therefore in compression refrigerating machine,
From the oil recycling very important effect of Function of refrigerant system oil recovery.
Patent Document 1 discloses a kind of centrifugal refrierators, by being arranged in evaporator with different level configurations
Multiple oily recovery ports (liquid outflow portion), the liquid level of the refrigerant of evaporator is detected using liquid level sensor, surface cock
Thus the oily recovery port for being located at the underface of liquid level of refrigerant is opened, only to recycle the system containing more lubricating oil in position
Cryogen liquid.
Patent document 1: No. 5993332 bulletins of Japanese Patent No.
In the centrifugal refrierator disclosed in patent document 1, when the feelings that the boiling situation in evaporator inner refrigerant is violent
Under condition, even if liquid level is present in the position higher than oily recovery port (liquid outflow portion), the refrigerant gas for becoming bubble also can be excellent
First from oily recovery port to discharge piping discharge, and the discharge of refrigerant liquid is obstructed.Therefore exist and generate the liquid containing lubricating oil
The problem of yield of the refrigerant of body state is micro situation.In addition as described above, the system of liquid condition is not detected
Cryogen yield is the unit of micro state, therefore in the presence of the heat transfer property reduction for causing lubrication shortage of oil, heat exchanger
Problem.
Summary of the invention
The present invention is made in view of the foregoing, and it is an object of the present invention to provide a kind of compression refrigerating machine, by evaporating
Gas-liquid separation container is arranged in the external of device, thus, it is possible to by the refrigerant air-liquid recycled from evaporator be separated into refrigerant gas,
With the refrigerant liquid containing lubricating oil, the flowing of refrigerant liquid will not be by refrigerant in the discharge piping being connected with suction device
Gas hinders, but the refrigerant liquid containing lubricating oil only can be recovered in oil tank.
To achieve the goals above, compression refrigerating machine of the invention has evaporator, compressor and condenser, special
Sign is have: gas-liquid separation container, from the evaporator recycle refrigerant and by its gas-liquid separation be refrigerant gas and
Refrigerant liquid containing lubricating oil；Liquid refrigerant recycling piping, by the liquid outflow portion of the evaporator and the gas-liquid
The liquid inflow part of separation vessel connects；Discharge piping, from the gas-liquid separation container by the refrigerant liquid containing lubricating oil
It is expelled to suction device；Level detection unit detects the liquid level in the gas-liquid separation container；Dump valve, setting
It is piped in the discharge, is opened and closed according to the liquid level in the gas-liquid separation container；And gas phase portion connecting pipings,
The gas phase portion of the gas-liquid separation container is connect with the gas phase portion of the evaporator.
According to the present invention, even if containing in the refrigerant of the liquid outflow portion (oily recovery port) for being present in evaporator nearby
In the case where a large amount of refrigerant gas, the refrigerant air-liquid recycled from evaporator can be also separated into system by gas-liquid separation container
Refrigerant gas and refrigerant liquid containing lubricating oil, in the discharge piping for being connected to suction device from gas-liquid separation container, system
The flowing of cryogen liquid will not be hindered by refrigerant gas.
Preferred embodiment according to the present invention, which is characterized in that gas-liquid separation container setting is from compression refrigerating machine
Front, side, upper surface observation when the smallest position of projected area.
Preferred embodiment according to the present invention, which is characterized in that the level detection unit have upper limit level setpoint and
Lower limit level setpoint, the upper limit level setpoint are lower than the height of the liquid outflow portion of the evaporator.
It according to the present invention, can be always in gas-liquid separation container by refrigerant regardless of the operating condition of refrigeration machine
Possess to upper limit level setpoint, gas-liquid separation container suitably discharging refrigerant can be passed through.
Preferred embodiment according to the present invention, which is characterized in that the liquid refrigerant recycling piping is by configuring different
The more liquid refrigerants recycling piping of height is constituted, which has oily recovery valve, institute respectively
It is different according to the open and-shut mode of multiple oily recovery valves to state upper limit level setpoint.
According to the present invention, slightly by the liquid outflow portion for the evaporator that will be connected to the oily recovery valve for becoming opening state
Position on the lower is set as upper limit level setpoint, increases in the liquid outflow portion from upper side (than the liquid outflow portion of lower part
Top liquid outflow portion) refrigeration dose possessed of gas-liquid separation container in the case where recycling refrigerant, thus, it is possible to reduce
The opening and closing number of dump valve, helps to improve the service life of valve.
Preferred embodiment according to the present invention, which is characterized in that the level detection unit and the dump valve are by ball-cock assembly
It constitutes.
Preferred embodiment according to the present invention, which is characterized in that have the control device for the opening and closing for controlling the dump valve, institute
It states level detection unit to be made of level detection sensors device, the level detection signal of the level detection sensors device is input into institute
Control device is stated, the dump valve is opened and closed in the level detection signal of the control device based on input.
Preferred embodiment according to the present invention, which is characterized in that the level detection signal indicate fluid value be regulation
During upper limit value more than or lower limit value situation below under or until changing to lower limit value from upper limit value or from
Until lower limit value changes to upper limit value, in the case where have passed through the defined time, the control device is determined as alarm state.
Preferred embodiment according to the present invention, which is characterized in that the liquid refrigerant recycling piping is by configuring different
The more liquid refrigerants recycling piping of height is constituted, which has oily recovery valve respectively,
In the case that the control device is determined as the alarm state, by the oily recovery valve for being located at lowest order and the discharge
Valve is opened.
In accordance with the invention it is possible to the refrigerant containing lubricating oil is expelled to oil tank, it can be using situation as alarm state
It notifies attendant and continues the operating of compressor.As supplement, such as in the case where dump valve is closed and broken down,
Since no normal direction oil tank supplies the refrigerant containing lubricating oil, other alarms such as bearing temperature height occur, in this case
Refrigeration machine is stopped.
The present invention plays the effect being exemplified below.
(1) even if containing a large amount of system in the refrigerant of the liquid outflow portion (oily recovery port) for being present in evaporator nearby
In the case where refrigerant gas, the refrigerant air-liquid recycled from evaporator can be also separated into refrigerant gas by gas-liquid separation container
Body and refrigerant liquid containing lubricating oil, in the discharge piping for being connected to suction device from gas-liquid separation container, refrigerant liquid
Flowing will not be hindered by refrigerant gas.Therefore the refrigerant liquid containing lubricating oil can efficiently be recycled.
(2) it can monitor whether the recycling of the refrigerant liquid containing lubricating oil is normally carried out always, refrigeration can not recycled
Agent liquid or may occur recycle exception in the case where, carry out precognition alarm control, thus cause fatal lubrication shortage of oil,
Before heat transfer property reduces, precognition alarm can be issued and carry out reply processing.
Detailed description of the invention
Fig. 1 is the schematic diagram for indicating the embodiment of compression refrigerating machine of the invention.
Fig. 2 is the schematic sectional view for indicating the relationship of evaporator, gas-liquid separation container and displacer.
Fig. 3 is the figure for indicating for level detection sensors device and dump valve to be replaced into the embodiment of ball-cock assembly.
Fig. 4 is to indicate to be not provided with oily recycling in the liquid refrigerant recycling piping for connecting evaporator with gas-liquid separation container
The figure of the embodiment of valve.
Fig. 5 (a), Fig. 5 (b), Fig. 5 (c) are the figures for indicating the configuration relation of evaporator and gas-liquid separation container.
Description of symbols: 1 ... centrifugal compressor；2 ... condensers；3 ... evaporators；4 ... economizers；5 ... refrigerants
Piping；5BP ... refrigerant supplying tubing；10 ... control devices；11 ... first order impellers；12 ... second level impellers；13 ... compressions
Machine motor；14 ... sucking blades；15 ... gear-boxes；16 ... oil tanks；17 ... balance pipes；20 ... displacers；21 ... refrigerants return
Piping；23 ... liquid level sensors；25 ... heat transfer tube groups；30 ... gas-liquid separation containers；31 ... discharge pipings；32 ... level detections pass
Sensor；33 ... gas phase portion connecting pipings；L1~L3 ... liquid outflow portion；The recycling piping of P1~P3 ... liquid refrigerant；V1~
The oily recovery valve of V3 ...；Vd ... dump valve；FV ... ball-cock assembly；DS ... dead space；It is minimum in evaporator in the operating of LL ... refrigeration machine
Liquid level；The height of the outlet of H1 ... discharge piping 31；H2 ... and the comparable liquid level of lower limit level setpoint；H3 ... with it is upper
Limit the comparable liquid level of level setpoint
Specific embodiment
Hereinafter, illustrating the embodiment of compression refrigerating machine of the invention referring to figs. 1 to Fig. 5 (a)~Fig. 5 (c).In Fig. 1
Into Fig. 5 (a)~Fig. 5 (c), identical appended drawing reference is marked to same or equivalent constituent element and the repetitive description thereof will be omitted.
Fig. 1 is the schematic diagram for indicating the embodiment of compression refrigerating machine of the invention.In Fig. 1, as compression system
Cold shows centrifugal refrierator.As shown in Figure 1, centrifugal refrierator has: centrifugal compressor 1 compresses refrigerant；It is cold
Condenser 2 cools down compressed refrigerant gas using cooling water (cooling fluid) and makes its condensation；Evaporator 3,
Capture heat from cold water (cooled fluid) and make refrigerant evaporation to play refrigeration effect；And the warp as intercooler
Help device 4, configures between condenser 2 and evaporator 3, is connected above-mentioned each equipment by the refrigerant piping 5 for refrigerant circulation
It ties and constitutes centrifugal refrierator.
In the embodiment shown in figure 1, centrifugal compressor 1 is made of multistage centrifugal compressor, multistage centrifugal
Compressor is made of two-stage centrifugal compressor, by first order impeller 11, second level impeller 12 and revolves above-mentioned impeller 11,12
The compressor motor 13 turned is constituted.The suction side of first order impeller 11 is provided with sucking blade 14, for adjusting refrigerant gas
Inhalation flow of the body to impeller 11,12.Centrifugal compressor 1 has the gear-box 15 of receiving bearing, booster engine, in gear-box 15
Lower part be provided with for the oil tank 16 to bearing and booster engine fuel feeding.Gear-box 15 is by oil tank balance pipe 17 centrifugal
The low-pressure section counterpressure of compressor 1.Centrifugal compressor 1 is connect by refrigerant piping 5 with economizer 4, in economy
The refrigerant gas that device 4 is isolated is directed to the centre of the multi-stage compression grade (being in this embodiment two-stage) of centrifugal compressor 1
Partially (part between first order impeller 11 and second level impeller 12 in this embodiment).
In the refrigeration cycle of the centrifugal refrierator constituted as shown in Figure 1, refrigerant is in centrifugal compressor 1, condensation
Device 2, evaporator 3 and economizer 4 recycle, and cope with load using the Cooling and Heat Source manufacture cold water obtained in evaporator 3, are freezing
The heat for carrying out flash-pot 3 got in circulation and the comparable heat of function with the centrifugal compressor 1 supplied from motor 13
Amount is discharged to supply to the cooling water of condenser 2.On the other hand, the refrigerant gas that economizer 4 is isolated be directed to from
The middle section of the multi-stage compression grade of core type compressor 1 is collaborated with the refrigerant gas from first order compressor, and by second
Grade compressor compresses.The refrigeration effect part of economizer 4, therefore the part phase are added according to two stages of compression single-stage cycles, economized
Increase refrigeration effect with answering, therefore compared with the case where being not provided with economizer 4, can be realized the high efficiency of refrigeration effect.
It is provided with refrigerant supplying tubing 5BP, the refrigerant supplying tubing 5BP is from by centrifugal compressor 1 and condenser 2
5 branch of refrigerant piping of connection simultaneously extends to displacer 20.The one of the refrigerant of condenser 2 is flowed to from centrifugal compressor 1
Part is directed to displacer 20 by refrigerant supplying tubing 5BP.The outlet of displacer 20 is returned via refrigerant
It is piped 21 and is connect with the top of the gear-box of centrifugal compressor 1 15.
Evaporator 3 is provided with liquid level sensor 23, the liquid level sensor 23 detection is accumulated in the refrigeration inside evaporator 3
The liquid level of agent.The liquid level sensor 23 is connect with control device 10, by the liquid for the refrigerant that liquid level sensor 23 detects
The measured value of face height is sent to control device 10.Evaporator 3 is provided with the first liquid outflow portion L1, second liquid outflow
Portion L2 and third liquid outflow portion L3 is as oily recovery port.Aforesaid liquid outflow portion L1~L3 configures the difference in evaporator 3
Height.Liquid outflow portion L1~L3 is mounted on the outer surface of evaporator 3, and is connected to the inside of evaporator 3.
Liquid outflow portion L1~L3 recycles piping P1~P3 by multiple liquid refrigerants and connects with gas-liquid separation container 30
It connects.Aforesaid liquid refrigerant-recovery piping P1~P3 be respectively arranged with the first oily recovery valve V1, the second oil recovery valve V2 and
Third oil recovery valve V3.Aforesaid liquid refrigerant-recovery is piped P1~P3 and liquid refrigerant recycling piping interflow, and even
It is connected to the liquid inflow part of gas-liquid separation container 30.First~third oil recovery valve V1~V3 is connect with control device 10, and first
The on-off action of~third oil recovery valve V1~V3 is controlled by control device 10.More specifically, control device 10 is first
In~third liquid outflow portion L1~L3 only by be located at evaporator 3 in refrigerant liquid level underface liquid outflow portion with
The mode that gas-liquid separation container 30 is connected to operates first~third oil recovery valve V1~V3.
Gas-liquid separation container 30 constitute are as follows: from evaporator 3 recycle refrigerant and by its gas-liquid separation be refrigerant gas and
Refrigerant liquid containing lubricating oil.It is connected with discharge piping 31 in gas-liquid separation container 30, for the refrigeration of lubricating oil will to be contained
Agent liquid is expelled to displacer 20 from gas-liquid separation container 30.It is provided in discharge piping 31 according to the liquid in gas-liquid separation container 30
The dump valve Vd that face height is opened and closed.The valve that dump valve Vd can be controlled opening and closing by solenoid valve, motor-driven valve etc. like that is constituted.?
Gas-liquid separation container 30 is provided with level detection sensors device 32, which constitutes detection gas-liquid separation container 30
The level detection unit of interior liquid level.It is additionally provided with gas phase portion connecting pipings 33, for by the gas of gas-liquid separation container 30
Phase portion is connect with the gas phase portion of evaporator 3.
Displacer 20 constitutes suction device, which will be from centrifugal compressor 1 via refrigerant supplying tubing 5BP
The refrigerant of supply is acted as driving source, for attracting the refrigerant containing lubricating oil from gas-liquid separation container 30.Row
The refrigerant containing lubricating oil that device 20 is attracted out returns together with the refrigerant being supplied to by refrigerant supplying tubing 5BP
To the gear-box 15 and oil tank 16 of centrifugal compressor 1.
Fig. 2 is the schematic sectional view for indicating the relationship of evaporator 3, gas-liquid separation container 30 and displacer 20.Such as Fig. 2 institute
Show, the inside of evaporator 3 be configured with heat transfer tube group 25, the heat transfer tube group 25 by for the heat conducting pipe of cold water flow arrangement it is multiple and
At.The cold water that the refrigerant of liquid phase is flowed in heat transfer tube group 25 heats and becomes the refrigerant of gas phase.It is provided in evaporator 3
Liquid level sensor 23, the liquid level sensor 23 detection are accumulated in the liquid level of the refrigerant inside evaporator 3.First~third
Liquid outflow portion L1~L3 is configured at various height.The first minimum liquid outflow portion L1 is located at minimum than heat transfer tube group 25
The slightly higher position of point, highest third liquid outflow portion L3 are located at the position more slightly lower than the highest point of heat transfer tube group 25.Second liquid
Body outflow portion L2 is between the first liquid outflow portion L1 and third liquid outflow portion L3.Three liquid flows in the present embodiment
L1~L3 configuration in portion is in three different height out, but the present invention is not limited to the examples, as long as more than one liquid flow is arranged
Portion out.
As shown in Fig. 2, liquid outflow portion L1~L3 recycles piping P1~P3 and gas-liquid point by multiple liquid refrigerants
It is connected from container 30.The first oily recovery valve V1, the second oil time are respectively arranged in aforesaid liquid refrigerant-recovery piping P1~P3
Receive valve V2 and third oil recovery valve V3.Aforesaid liquid refrigerant-recovery is piped P1~P3 and liquid refrigerant recycling piping
Interflow, and connect with the liquid inflow part of gas-liquid separation container 30.Being connected in gas-liquid separation container 30 will be containing lubricating oil
Refrigerant liquid is expelled to the discharge piping 31 of displacer 20 from gas-liquid separation container 30.It is provided in discharge piping 31 according to gas-liquid
Liquid level in separation vessel 30 is come the dump valve Vd that is opened and closed.Gas-liquid separation container 30 is provided with level detection sensors
Level detection unit of the device 32 as the liquid level in detection gas-liquid separation container 30.It, can also be with as level detection unit
It is the sensor that can continuously detect liquid level or either one or two of the switch that can discontinuously detect liquid level.
Level detection sensors device 32 has upper limit level setpoint and lower limit level setpoint, the setting of upper limit level setpoint
Height for the liquid outflow portion than evaporator 3 is low.Liquid refrigerant recycling piping is by configuring more liquid at various height
Cryogen recycling piping P1~P3 is constituted, more liquid refrigerants recycling piping P1~P3 have respectively oily recovery valve V1~
V3, above-mentioned upper limit level setpoint are different according to the open and-shut mode of above-mentioned multiple oily recovery valve V1~V3.That is, by will at
The position slightly by lower section of the liquid outflow portion of the evaporator 3 for the oily recovery valve connection being in an open state is set as the setting of upper limit liquid level
Value increases in liquid outflow portion (the liquid outflow portion more top than the liquid outflow portion of lower part) the recycling refrigerant from upper side
In the case of the refrigeration dose possessed of gas-liquid separation container 30 help to mention thus, it is possible to reduce the opening and closing number of dump valve Vd
The service life of high threshold.In addition, be provided with gas phase portion connecting pipings 33, the gas phase portion connecting pipings 33 is by the gas of gas-liquid separation container 30
Phase portion is connect with the gas phase portion of evaporator 3.
As shown in Fig. 2, by the way that gas-liquid separation container 30 is arranged in the external of evaporator 3, thus refrigerant by first~
One in one in third liquid outflow portion L1~L3 and liquid refrigerant recycling piping P1~P3 and flowed from evaporator 3
Enter gas-liquid separation container 30.In gas-liquid separation container 30, the refrigerant liquid containing lubricating oil is separated with refrigerant gas, gas-liquid
Liquid level in separation vessel 30 is gradually increasing.On the other hand, the refrigerant gas isolated is by by gas-liquid separation container 30
Gas phase portion connecting pipings 33 that gas phase portion is connect with the gas phase portion of evaporator 3 and be back to evaporator 3.In gas-liquid separation container 30
Liquid level rise, if detecting that liquid level reaches preset upper limit level setpoint by level detection sensors device 32,
The dump valve Vd for being set to discharge piping 31 is opened, and the refrigerant liquid containing lubricating oil in gas-liquid separation container 30 is discharged device
20 attract and are discharged from gas-liquid separation container 30.Refrigerant liquid is discharged from gas-liquid separation container 30, in gas-liquid separation container 30
Liquid level reduces, if detecting that liquid level reaches preset lower limit level setpoint by level detection sensors device 32, arranges
Valve Vd is closed out.Above-mentioned movement is repeated in the operating of refrigeration machine.
In order to set up above-mentioned movement, system below is generated in the setting position of gas-liquid separation container 30, piping connection
About.
As shown in Fig. 2, being become with the bottom of gas-liquid separation container 30 than by the examination under design and various operating conditions
The mode of the minimum level LL (shown in dotted line) in evaporator 3 tested in the refrigeration machine operating of result acquisition low position is arranged
Gas-liquid separation container 30.The liquid refrigerant that liquid outflow portion L1~L3 of evaporator 3 is connect with gas-liquid separation container 30 returns
Receive the link position of the gas-liquid separation container side in piping P1~P3 are as follows: than the minimum liquid in the evaporator 3 in refrigeration machine operating
Face LL low position.In this case, which is become down to the position of which kind of degree, is met as far as possible with becoming
The mode of the drop of the rail pressure loss part of the piping calculates.By liquid outflow portion L1~L3 of evaporator 3 and gas-liquid point
The piping installation of the vaporizer side in liquid refrigerant recycling piping P1~P3 connected from container 30 are as follows: become it is horizontal or to
Lower inclination.The gas phase portion connecting pipings 33 that the gas phase portion of gas-liquid separation container 30 is connect with the gas phase portion of evaporator 3, becomes logical
The gas-liquid separation container 30 and evaporator 3 that the test result crossed under design and various operating conditions obtains are in various operating items
Become the link position of gas phase under part.
For the row being arranged for open and close control in the discharge piping 31 for connecting gas-liquid separation container 30 with displacer 20
The setting liquid level of valve Vd out, the setting liquid level that dump valve Vd is opened become than the minimum liquid in the evaporator 3 in refrigeration machine operating
Face LL low position.The setting liquid level that dump valve Vd is closed becomes the discharge than gas-liquid separation container 30 to be connect with displacer 20
The high position of the link position of gas-liquid separation container side in piping 31.In addition, the gas-liquid separation container side in discharge piping 31
Link position preferably than the bottom of gas-liquid separation container 30 lean on lower side.What is connect with the bottom of gas-liquid separation container 30
In the case of, it is preferably provided with the mechanism that foreign matter removal is carried out by filter etc..The shape of gas-liquid separation container 30 with cylindrical shape,
Rectangular shape is representative, and shape is unrestricted.Volume, height, the setting liquid level of gas-liquid separation container 30 first pass through examination in advance
It tests and according to the setting of the yield of the refrigerant liquid containing lubricating oil, the opening and closing frequency and gas-liquid separation container 30 of dump valve Vd
Space determines.Since heating source being not present in gas-liquid separation container 30, the boiling of refrigerant, liquid level are not generated
Detection be easy.
It in the embodiment shown in figure 2, is that level detection sensors device 32 is used to be discharged as level detection unit
The open and close control of valve Vd, but the movement also can mechanically be implemented by ball-cock assembly.
Fig. 3 is the figure for indicating for level detection sensors device 32 and dump valve Vd to be replaced into the embodiment of ball-cock assembly FV.Root
According to ball-cock assembly FV shown in Fig. 3, control mechanically can be opened and closed to valve body according to the liquid level of gas-liquid separation container 30
System, therefore apparatus structure and control are extremely simple.
Fig. 4 is to indicate to be not provided with oil in the liquid refrigerant recycling piping for connecting evaporator 3 with gas-liquid separation container 30
The figure of the embodiment of recovery valve.As shown in figure 4, being returned in the liquid refrigerant for connecting evaporator 3 with gas-liquid separation container 30
It receives piping P1~P3 and is not provided with the oily recovery valve for being opened and closed flow path.Therefore according to the liquid level of the refrigerant in evaporator 3,
Refrigerant recycles piping P1~P3 by one or more liquid refrigerant and is flowed into gas-liquid separation container 30 from evaporator 3.
In Fig. 4, H1 indicates the height of the outlet for the discharge piping 31 for being provided with dump valve Vd, and H2 indicates to set with lower limit liquid level
It is worth the liquid level that dump valve Vd is closed at comparable liquid level, H3 is indicated high with the comparable liquid level of upper limit level setpoint
The liquid level that dump valve Vd is opened at degree.Embodiment according to Fig.4, according to the liquid level of the refrigerant in evaporator 3
Highly, refrigerant is flowed into gas-liquid separation container 30 from evaporator 3 by one~more liquid refrigerant recycling pipings, if
Liquid level reaches H3, then dump valve Vd is opened, and the refrigerant liquid containing lubricating oil in gas-liquid separation container 30 is discharged device
20 attract and are discharged from gas-liquid separation container 30.Refrigerant liquid is discharged from gas-liquid separation container 30, if in gas-liquid separation container 30
Liquid level reduce and reach H2, then dump valve Vd close.
In the compression refrigerating machine constituted as shown in Figures 1 to 4, control device 10 is monitored always from level detection
The level detection signal that sensor 32 inputs, and the fluid value (liquid level) represented by above-mentioned level detection signal is regulation
In a period of upper limit value more than or lower limit value situation below under or until changing to lower limit value from upper limit value or from
Until lower limit value changes to upper limit value, in the case where have passed through the defined time, it is determined as alarm state.Sentence in control device 10
The open and close control of common oily recovery valve Wei not be kept invalid in the case where above-mentioned alarm state, and carry out that lowest order will be located at
The control that oily recovery valve V1 and dump valve Vd is opened.
The main reason for as above-mentioned alarm, there is that level detection is bad, recovery port piping system is bad, evaporator boiling-like
The variation etc. of condition.
In this way, in accordance with the invention it is possible to monitor whether the recycling of the refrigerant liquid containing lubricating oil is normally carried out always,
Can not recycle refrigerant liquid or may cause recycling exception in the case where, carry out precognition alarm control, thus cause it is fatal
Lubrication shortage of oil, before heat transfer property reduces, precognition can be issued and alarm and carry out reply processing.
Fig. 5 (a), Fig. 5 (b), Fig. 5 (c) are the figures for indicating the configuration relation of evaporator 3 and gas-liquid separation container 30.In Fig. 5
(a), in Fig. 5 (b), Fig. 5 (c), the figure of upside is the perspective view for indicating evaporator 3 and gas-liquid separation vessel 30, and the figure of downside is A
Direction view.
In the example shown in Fig. 5 (a), the dead space DS of the lower side formation of the evaporator 3 in cylindrical shape is utilized
And it is configured with the gas-liquid separation container 30 of cylindrical shape.It configures in this way, the height gauge of compression refrigerating machine can not be increased
It is very little and configure gas-liquid separation container 30.
In the example shown in Fig. 5 (b), the dead space DS of the lower side formation of the evaporator 3 in cylindrical shape is utilized
And configure the gas-liquid separation container 30 of approximately cuboid shape.By by a side of gas-liquid separation container 30 along evaporation
The mode of the side of device 3 bends to arc-shaped and is formed, and thus, it is possible to efficiently use dead space DS.It configures in this way, it can
Do not increase compression refrigerating machine height dimension and width dimensions and configure gas-liquid separation container 30.
In the example shown in Fig. 5 (c), matched using the dead space DS that the lower section of the evaporator 3 in cylindrical shape is formed
Set the gas-liquid separation container 30 of cylindrical shape.Example shown in Fig. 5 (c) is in the base portion of bearing refrigeration machine and in the top of the base portion
Between the evaporator 3 of configuration in the case where formation dead space DS effectively.It configures in this way, compression refrigerating machine can not be increased
Width dimensions and configure gas-liquid separation container 30.
As shown in Fig. 5 (a), Fig. 5 (b), Fig. 5 (c), the refrigerant air-liquid recycled from evaporator is separated into refrigerant gas
The gas-liquid separation container 30 of volume needed for body and refrigerant liquid containing lubricating oil, is arranged in from compression refrigerating machine just
Projected area the smallest position when face, side, upper surface observation.
Embodiments of the present invention are illustrated so far, but the present invention is not limited to above-mentioned embodiment,
Within the scope of its technical ideas, it is of course possible to implement in a variety of ways.
Claims (8)
1. a kind of compression refrigerating machine has evaporator, compressor and condenser, which is characterized in that have:
Gas-liquid separation container recycles refrigerant and by its gas-liquid separation for refrigerant gas and containing lubrication from the evaporator
The refrigerant liquid of oil；
Liquid refrigerant recycling piping, the liquid of the liquid outflow portion of the evaporator and the gas-liquid separation container is flowed into
Portion's connection；
Discharge piping, is expelled to suction device from the gas-liquid separation container by the refrigerant liquid containing lubricating oil；
Level detection unit detects the liquid level in the gas-liquid separation container；
Dump valve is set to the discharge piping, is opened and closed according to the liquid level in the gas-liquid separation container；And
The gas phase portion of the gas-liquid separation container is connect by gas phase portion connecting pipings with the gas phase portion of the evaporator.
2. compression refrigerating machine according to claim 1, which is characterized in that
It is minimum that projected area when from the front of compression refrigerating machine, side, upper surface is arranged in the gas-liquid separation container
Position.
3. compression refrigerating machine according to claim 1 or 2, which is characterized in that
The level detection unit has upper limit level setpoint and lower limit level setpoint,
The upper limit level setpoint is lower than the height of the liquid outflow portion of the evaporator.
4. compression refrigerating machine according to claim 3, which is characterized in that
Liquid refrigerant recycling piping is made of the more liquid refrigerants recycling piping for configuring at various height, this is more
The recycling piping of root liquid refrigerant has oily recovery valve respectively,
The upper limit level setpoint is different according to the open and-shut mode of multiple oily recovery valves.
5. compression refrigerating machine according to claim 1 or 2, which is characterized in that
The level detection unit and the dump valve are made of ball-cock assembly.
6. compression refrigerating machine according to claim 1 or 2, which is characterized in that
Have the control device for the opening and closing for controlling the dump valve,
The level detection unit is made of level detection sensors device, and the level detection signal of the level detection sensors device is defeated
Enter the control device,
The level detection signal of the control device based on input, is opened and closed the dump valve.
7. compression refrigerating machine according to claim 6, which is characterized in that
The level detection signal indicate fluid value be specified time limit in upper limit value more than or lower limit value feelings below
Until changing to upper limit value under condition or until changing to lower limit value from upper limit value or from lower limit value, when have passed through defined
Between in the case where, the control device is determined as alarm state.
8. compression refrigerating machine according to claim 7, which is characterized in that
Liquid refrigerant recycling piping is made of the more liquid refrigerants recycling piping for configuring at various height, this is more
The recycling piping of root liquid refrigerant has oily recovery valve respectively,
In the case where the control device is determined as the alarm state, the oily recovery valve and the institute of lowest order will be located at
State dump valve opening.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| JP2017134460A JP6829664B2 (en) | 2017-07-10 | 2017-07-10 | Compressed refrigerator |
| JP2017-134460 | 2017-07-10 |
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| CN109237829A true CN109237829A (en) | 2019-01-18 |
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| CN201810637423.2A Pending CN109237829A (en) | 2017-07-10 | 2018-06-20 | Compression refrigerating machine |
| CN201820954299.8U Active CN208579537U (en) | 2017-07-10 | 2018-06-20 | Compression refrigerating machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112013260A (en) * | 2019-05-29 | 2020-12-01 | 开利公司 | Lubricant recovery system for heat exchange system and heat exchange system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6829664B2 (en) * | 2017-07-10 | 2021-02-10 | 荏原冷熱システム株式会社 | Compressed refrigerator |
| CN110388761A (en) * | 2019-07-24 | 2019-10-29 | 重庆美的通用制冷设备有限公司 | Refrigerating plant |
| CN113639390B (en) * | 2021-07-16 | 2022-12-27 | 青岛海尔空调电子有限公司 | Control method and system of air conditioner compressor |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN208579537U (en) | 2019-03-05 |
| JP2019015471A (en) | 2019-01-31 |
| JP6829664B2 (en) | 2021-02-10 |
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