CN103649653B - There is the refrigerating circuit that oil subsidy is repaid - Google Patents

There is the refrigerating circuit that oil subsidy is repaid Download PDF

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Publication number
CN103649653B
CN103649653B CN201180072300.5A CN201180072300A CN103649653B CN 103649653 B CN103649653 B CN 103649653B CN 201180072300 A CN201180072300 A CN 201180072300A CN 103649653 B CN103649653 B CN 103649653B
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China
Prior art keywords
compressor
oil
bank
pressure
interceptor
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Expired - Fee Related
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CN201180072300.5A
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Chinese (zh)
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CN103649653A (en
Inventor
S.黑尔曼
C.克伦
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Carrier Corp
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Carrier Corp
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Classifications

    • 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
    • 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
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • 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
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/03—Oil level

Abstract

A kind of refrigerating circuit (2) comprises circulating refrigerant and comprises on flow of refrigerant direction: at least one first kind compressor (4a, 4b, 4c); Heat rejection heat exchanger (6); Bloating plant (8); With evaporimeter (10).Refrigerating circuit (2) also comprises: at least one Second Type compressor (12); Oil interceptor (26), described oil interceptor (26) optionally can be connected to first kind compressor (4a, 4b, 4c) and/or Second Type compressor (12) connects to arrange fluid between oil interceptor (26) and corresponding compressor.Oil interceptor (26) optionally can be connected to high-tension line (36) to increase the pressure in oil interceptor (26), thus oil is delivered at least one Second Type compressor (12) from oil interceptor (26).

Description

There is the refrigerating circuit that oil subsidy is repaid
Technical field
On the flow direction of circulating refrigerant, refrigerating circuit comprises at least one compressor, heat rejection heat exchanger, bloating plant and evaporimeter, and this refrigerating circuit is known in the statement of this area.Before being inflated at cold-producing medium, the cold-producing medium leaving heat rejection heat exchanger is cooled further it is also known that arrange additional economizer, thus improve the efficiency of refrigerating circuit.
Background technology
This economizer comprises at least one additional compressor, and this additional compressor runs with the suction pressure higher than the compressor of refrigerating circuit.
Due to higher suction pressure, the oil (it is for lubricate compressors) of the compressor of economizer is lost to (at refrigerating circuit Inner eycle) cold-producing medium is more than the compressor of refrigerating circuit.Along with the passage of running time, this effect causes gathering oil in the compressor of refrigerating circuit, and causes the oil in the compressor of economizer to run off.When oil level in the compressor of economizer drops to below lowest order, compressor may seriously be damaged.
Therefore, there is the demand of oil being got back to the compressor of economizer from the compressor transmission of refrigerating circuit.
Summary of the invention
Therefore, will advantageously, a kind of refrigerating circuit and a kind of method running this refrigerating circuit are provided, this refrigerating circuit and method allow to compensate oil between the compressor sucking level run with difference, and allow oil especially from the second group of compressor be passed to first group of compressor of low suction (entrance) pressure duty with higher suction (entrance) pressure duty.
Exemplary embodiment of the present invention comprises a kind of refrigerating circuit, and it makes refrigerant circulation and on the flow direction of described cold-producing medium, comprises at least one compressor of the first compressor bank, heat rejection heat exchanger, bloating plant and evaporimeter.Described refrigerating circuit also comprises at least one compressor and the oil interceptor of the second compressor bank, described oil interceptor is optionally connected to the described compressor of described first compressor bank to collect excessive oil from least one compressor described in described first compressor bank, and/or is connected to the described compressor of described second compressor bank.Described oil interceptor is optionally connected to high-tension line to increase the pressure in described oil interceptor, thus oil is delivered at least one compressor described in described second compressor bank from described oil interceptor.
The other exemplary embodiment of the present invention comprises a kind of method by oil interceptor, oil being delivered at least one compressor of the second compressor bank from least one compressor of the first compressor bank, described oil interceptor is optionally connected to described compressor, and described method comprises step: the oil groove described oil interceptor fluid being connected to the described compressor of described first compressor bank; Below suction pressure pressure in described oil interceptor being reduced to the described compressor of described first compressor bank, oil is drawn into described oil interceptor from the described oil groove of the described compressor of described first compressor bank; Described oil interceptor fluid is connected to the described compressor of described second compressor bank; On the pressure increase in described oil interceptor to the suction pressure of the described compressor of described second compressor bank, oil to be supplied to the described compressor of described second compressor bank from described oil interceptor.
The other exemplary embodiment of the present invention comprises a kind of method compensating oil between at least two compressors of two different compressors groups, and it comprises step: monitor the oil level at least one compressor of the second compressor bank; And if the oil level in the described compressor of the second compressor bank drops to below predetermined minimum of a value, use the method by oil interceptor, oil being passed at least one compressor of the second compressor bank from least one compressor of the first compressor bank, oil is passed to the described compressor of the second compressor bank from least one compressor of the first compressor bank.
Compensate the method for oil between at least two compressors that the other exemplary embodiment of the present invention is included in two different compressors groups, it comprises step: monitor the oil level at least one compressor of the first compressor bank; And if the oil level at least one compressor of described first compressor bank rises to more than predetermined maximum, use the method by oil interceptor, oil being passed at least one compressor of the second compressor bank from least one compressor of the first compressor bank, oil is passed to the compressor of the second compressor bank from least one compressor of described first compressor bank.
Accompanying drawing explanation
With reference to the accompanying drawings exemplary embodiment of the present invention is described in more detail, wherein:
Fig. 1 shows the schematic diagram of the refrigerating circuit comprising economizer;
Fig. 2 oil subsidy shown according to a first embodiment of the present invention repays the schematic diagram with arranging;
Fig. 3 shows the schematic diagram of the refrigerating circuit comprising economizer and refrigerating circuit; And
Fig. 4 oil subsidy shown according to a second embodiment of the present invention repays the schematic diagram with arranging.
Specific embodiment
Fig. 1 shows the schematic diagram of the exemplary embodiment of refrigerating circuit 2, on the flow direction represented by the arrow of refrigerant circulation in refrigerating circuit 2, described refrigerating circuit 2 comprises a set of compressor 4a of the first compressor bank of parallel join, 4b, 4c, heat rejection heat exchanger 6, economizer heat exchanger 14, high pressure valve or high-tension apparatus 17, coolant collector 18, bloating plant 8 and be connected to compressor 4a, the evaporimeter 10 of suction (entrance) side of 4b, 4c.
On flow direction indicated by the arrow, refrigerating circuit 2 also comprises economizer, and described economizer has energy-conservation bloating plant 16, economizer heat exchanger 14 and energy-saving compressor 12.
In order to energy saving in running loop, expanded by energy-conservation bloating plant 16 from the main flow bifurcated of cold-producing medium from the some refrigerant stream of heat rejection heat exchanger 6.The flow of refrigerant be inflated from energy-conservation bloating plant 16 crosses the Part I 14a of economizer heat exchanger 14, economizer heat exchanger 14 is for cooling from heat rejection heat exchanger 6 and being flow to the main flow of refrigerant of high pressure valve or high-tension apparatus 17 by the Part II 14b of economizer heat exchanger 14, and the Part II 14b of described economizer heat exchanger 14 is against the part stream of the cold-producing medium be inflated.After the Part I 14a leaving economizer heat exchanger 14, the part stream of cold-producing medium compressed by energy-saving compressor 12 and with the pressure of compressor 4a, 4b, 4c the supply system cryogen same (height) by the first compressor bank by for the entrance being back to heat rejection heat exchanger 6.
The degree that the cold-producing medium flowing through economizer is expanded by energy-conservation bloating plant 16 is different with the degree that bloating plant 8 expands by high pressure valve 17 with the cold-producing medium of the major part flowing through refrigerating circuit 2.Evaporating temperature and the pressure of compressor 4a, 4b, 4c of energy-conservation evaporating temperature and pressure ratio therefore first compressor bank are high.Therefore, the suction density in energy-conservation suction inlet is higher.
As previously discussed, this pressure reduction result in oil only transmit from compressor from energy-saving compressor 12 to refrigerating circuit 2 4a, 4b, 4c.
Fig. 2 shows the exemplary embodiment according to oily transmission mechanism of the present invention, and this oily transmission mechanism is configured to oil to be passed to from compressor 4a, 4b, 4c of the first compressor bank of low suction pressure level run with at least one compressor 12 of the second compressor bank of the suction pressure level run higher than the first compressor bank.
May correspond to compressor 4a, 4b, the 4c in refrigerating circuit 2 with compressor 4a, 4b, 4c of first group of low suction pressure level run, and the compressor 12 of the second compressor bank may correspond to the energy-saving compressor 12 in the economizer shown in Fig. 1.
By cold-producing medium suction circuit 3, cold-producing medium is supplied to compressor 4a, 4b, 4c of first group with low-pressure, and supplies to be back to refrigerating circuit 2 with high pressure by by the cold-producing medium compressed by high-pressure discharge circuit 5.
Each in compressor 4a, 4b, 4c of first group comprises oil groove 7a, 7b, 7c, and defines minimum oil level 9a, 9b, 9c to each oil groove 7a, 7b, 7c.
Excessive oil circuit 22 leads to oil groove 7a, 7b, 7c above corresponding minimum oil level 9a, 9b, 9c, make oil groove 7a, 7b, 7c of compressor 4a, 4b, 4c each other fluid connect and make oil groove 7a, 7b, 7c fluid be connected to oil interceptor 26, described oil interceptor 26 is configured in the level of described first kind hydraulic shrinking machine 4a, 4b, below 4c.
If the oil level at least one of the described first kind compressor 4a, 4b, 4c is on corresponding minimum oil level 9a, 9b, 9c, excessive oil circuit 22 allows oil to flow into oil interceptor 26 from each oil groove 7a, 7b, 7c.
In the embodiment shown in Figure 2, but oil interceptor 26 is formed as basic horizontal and arranges the pipeline that tilts a little relative to level, to make oil interceptor 26 have to be arranged in the upper end 26a on the horizontal plane higher than bottom 26b.Oil interceptor 26 fluid is connected to the compressor 12 of the second compressor bank by the fuel feeding circuit 30 being connected to the bottom 26b of oil interceptor 26, allow by fuel feeding circuit 30 from oil interceptor 26 oil groove 13 fuel feeding to the compressor 12 of described second compressor bank.Delivery valve 32 is arranged in fuel feeding circuit 30.If refrigerating circuit 2 only comprises the compressor 12 of second compressor bank, delivery valve 32 can be unidirectional check (non-return) valve, and but this unidirectional check (non-return) valve allows oil flow to the compressor 12 of the second compressor bank from oil interceptor 26 do not allow oil to flow into oil interceptor 26 from the compressor 12 of the second compressor bank in the opposite direction.If refrigerating circuit 2 comprises the compressor 12 of more than second compressor bank, switchable delivery valve 32(such as magnetic valve) can associate with each compressor 12 of the second compressor bank respectively, selectively to allow and not allow oil to flow to the oil groove 13 of each compressor 12 of the second compressor bank from oil interceptor 26.
The upper end 26b of oil interceptor 26 is connected to the high-pressure discharge circuit 5 of compressor 4a, 4b, 4c of the first compressor bank by high-tension line 36.Switchable high pressure valve 38 is arranged in described high-tension line 36, and this allows, optionally by opening high pressure valve 38 with the pressure increased in oil interceptor 26, oil interceptor 26 fluid is connected to high-pressure discharge circuit 5.
Oil interceptor 26 is also connected to compressor 4a, 4b, 4c of the first compressor bank cold-producing medium by low-voltage circuit 40 sucks circuit 3.Low-voltage circuit 40 leads to cold-producing medium by escaper 44 and sucks circuit 3, and this escaper 44 operationally makes the pressure drop in low-voltage circuit 40 suck below the pressure in circuit 3 to cold-producing medium.
Switchable low pressure valve 42 is arranged in low-voltage circuit 40, this allows the value below optionally by the suction pressure opening low pressure valve 42 and to be reduced to by the pressure in oil interceptor 26 compressor 4a, 4b, 4c of first compressor bank, and oil interceptor 26 fluid is connected to the escaper 44 being arranged in low-voltage circuit 3 place.
The end wall of oil interceptor 26 is respectively arranged with transparent detection glass 28a, 28b, to allow the oil collected in vision-based detection oil interceptor 26.
As discussed above, when refrigerating circuit 2 runs when economizer is actuated, due to the pressure reduction between compressor 4a, 4b, 4c of the first compressor bank and the compressor 12 of the second compressor bank, oil is passed to the oil groove of compressor 4a, 4b, 4c of the first compressor bank from the oil groove 13 of the compressor 12 of the second compressor bank.
In order to be collected in the excessive oil gathered in oil groove 7a, 7b, 7c of compressor 4a, 4b, 4c of the first compressor bank, switchable low pressure valve 42 is opened, and this cold-producing medium making oil interceptor 26 be connected to compressor 4a, 4b, 4c of being arranged in the first compressor bank by low-voltage circuit 40 fluid sucks the escaper 44 in circuit 3.
Pressure in low-voltage circuit 40 and oil interceptor 26 is decreased to the value of below the suction pressure of compressor 4a, 4b, 4c of the first compressor bank by escaper 44.Due to oil interceptor 26 and this pressure reduction between compressor 4a, 4b, 4c, the oil from the region above minimum oil level 9a, 9b, 9c of oil groove 7a, 7b, 7c of compressor 4a, 4b, 4c of the first compressor bank is inhaled into oil interceptor 26 by excessive oil circuit 22.Under this operational mode (receiving oily pattern), when oil is inhaled into oil interceptor 26 from oil groove 7a, 7b, 7c of compressor 4a, 4b, 4c of the first compressor bank, high pressure valve 38 and delivery valve 32 are closed.
If oil interceptor 26 is arranged in the horizontal plane below compressor 4a, 4b, 4c of the first compressor bank, then difference in height can be enough large, thus even with low-voltage circuit 40, oil can be passed to oil interceptor 26 from compressor 4a, 4b, 4c of the first compressor bank.In this case, the hydrostatic pressure difference between compressor 4a, 4b, 4c and oil interceptor 26 may cause excessive oil to flow into oil interceptor 26 from oil groove 7a, 7b, 7c.
In order to transmit oil (it has been collected in oil interceptor 26 as previously described) from oil interceptor 26 to the compressor 12 of the second compressor bank, while opening high pressure valve 38 and delivery valve 32, close low pressure valve 42(fuel feeding pattern).
The high-pressure discharge circuit 5 opening compressor 4a, 4b, 4c collector 26 fluid being connected to the first compressor bank of high pressure valve 38, which increases the pressure in oil interceptor 26.Be arranged in hole in excessive oil circuit 22 or check valve 24 to avoid the pressure increased in oil interceptor 26 and be compensated to immediately in compressor 4a, 4b, 4c of the first compressor bank through gauging circuit 22.
Alternatively, in receive the oil collected in the bottom 26b at oil interceptor 26 under oily pattern by fuel feeding circuit 30 and the delivery valve 32 opened by oil interceptor 26 in the pressure that increases be pressed into the oil groove 13 of the compressor 12 of the second compressor bank, to improve the oil level 15 in the compressor 12 of described second compressor bank.
This oil is repaid from oil interceptor 26 to providing effective oil subsidy between compressor 4a, 4b, 4c of being delivered in the first compressor bank run with relatively low suction pressure of the compressor 12 of the second compressor bank and the compressor 12 of the second compressor bank run with higher suction pressure.
To be passed to the compressor 12 of the second compressor bank from oil interceptor 26 at oil after, close high pressure valve 38 to make oil stop flowing to from oil interceptor 26 compressor 12 of the second compressor bank.
By reopening low pressure valve 42 and value below the suction pressure pressure in oil interceptor 26 being decreased to again compressor 4a, 4b, 4c of the first compressor bank, and with from the oil in compressor 4a, 4b, 4c of the first compressor bank, oil interceptor 26 can be filled again.
For technical staff self-evidently, the embodiment shown in Fig. 2 similarly can be used as multiple compressors 12 fuel feeding to the second compressor bank.The oil groove 13 of the compressor 12 of the second compressor bank is connected to each other by oily compensated line.Alternatively, each compressor 12 can be connected to oil interceptor 26 by multiple fuel feeding circuit 30 respectively.In this case, each compressor 12 of the second compressor bank can be supplied to from the oil in oil interceptor independent of other compressors 12 of the second compressor bank.
Can by means of be arranged in oil groove 7a, 7b, 7c, 13 at least one in and/or the oil sensor 34 that is arranged in oil interceptor 26 and oily transmission method described in controlling.When oil level particularly in one of them compressor of the second compressor bank the oil level dropped in compressor 4a, 4b, 4c of minimum oil level less than 15 and/or the first compressor bank or oil interceptor 26 exceedes predetermined the highest oil level, oil transmission can be started.
Fig. 3 shows the second embodiment of the refrigerating circuit 2 comprising additional refrigerating circuit 54.
The feature of second embodiment identical with the feature of the first embodiment shown in Fig. 1 represents with identical Reference numeral, and no longer discusses in detail.
Refrigerating circuit 54 is configured for the cryogenic temperature produced outside the cryogenic temperature that provided by refrigerating circuit 2.Typical cryogenic temperature is at 0 DEG C within the scope of 10 DEG C, and cryogenic temperature is typically in the scope of-20 DEG C to-5 DEG C.
Refrigerating circuit 54 comprises the freezing bloating plant 52 being connected to refrigerating circuit 2.Freezing bloating plant 52 is supplied to the part of refrigerant of circulation in refrigerating circuit 2.Described part of refrigerant is frozen bloating plant 52 and is expanded to even lower than the cold-producing medium expanded by bloating plant 8 pressure, and evaporated by the refrigerating evaporator 50 being arranged in freezing bloating plant 52 downstream, to produce the cryogenic temperature of below the temperature that produces at the evaporimeter 10 by refrigerating circuit 2.
After leaving refrigerating evaporator 50, the cold-producing medium of refrigerating circuit 54 is frozen suction (entrance) pressure that compressor 48 is compressed to compressor 4a, 4b, 4c of refrigerating circuit 2, is namely compressed into the pressure identical with the cold-producing medium of the evaporimeter 10 leaving refrigerating circuit 2.Refrigerant condenser 48 is compressors of the 3rd compressor bank, it sucks the inlet pressure that (entrance) stress level is less than compressor 4a, 4b, 4c of refrigerating circuit 2, and outlet pressure levels equals suction (entrance) pressure of compressor 4a, 4b, 4c of refrigerating circuit 2.In this nonlimiting, freezing bloating plant 52, refrigerating evaporator 50 and refrigerant condenser 48 parallel join are in bloating plant 8 and evaporimeter 10.
Fig. 4 shows the second exemplary embodiment according to oily bucking-out system of the present invention, and this oily bucking-out system can be run in conjunction with the refrigerating circuit 2 comprising refrigerating circuit 54 as shown in Figure 3.
The feature corresponding with the feature of the first embodiment shown in Fig. 2 represents with identical Reference numeral, and no longer discusses in detail.
In the second embodiment shown in Fig. 4, the pressure that reduces in oil interceptor 26 (it is provided to oil oil groove 7a, 7b, 7c from compressor 4a, 4b, 4c of the first compressor bank to suck oil interceptor 26) produces by utilizing escaper 44 low-voltage circuit 40 to be connected to the cold-producing medium suction circuit 3 of compressor 4a, 4b, 4c of the first compressor bank unlike in the first embodiment shown in Fig. 1.
Alternatively, low-voltage circuit 40 fluid is connected to the inlet line 46 of the compressor 48 of the 3rd compressor bank, and the compressor 48 of described 3rd compressor bank runs with suction (entrance) pressure below suction (entrance) pressure of compressor 4a, 4b, the 4c in the first compressor bank.Pressure in oil interceptor 26 is decreased to below suction (entrance) pressure of compressor 4a, 4b, 4c of the first compressor bank by this, and makes oil flow to oil interceptor 26 from oil groove 7a, 7b, 7c of compressor 4a, 4b, 4c of the first compressor bank.
The compressor 48 of the 3rd compressor bank can be the refrigerating circuit 2(that is contained in as shown in Figure 3) in the refrigerant condenser 48 of refrigerating circuit 54.
It runs with the suction pressure of compressor 4a, 4b, the 4c lower than the first compressor bank to use the refrigerant condenser 48(of refrigerating circuit 54) reduce in oil interceptor 26 pressure, avoid and suck at the cold-producing medium of compressor 4a, 4b, 4c of the first compressor bank demand circuit 3 being arranged escaper 44.Therefore, it is possible to saving arranges and keeps in repair the cost of escaper 44.
Allow to carry out compressor oil distribution in the system with different crankcase pressure according to the refrigerating circuit of exemplary embodiment as described herein, and it is particularly suitable for HFC system and is suitable for the system of sub-level and transcritical CO_2, although it is not limited thereto.Allow oil to be passed to the second group of compressor run with higher suction pressure from the first group of compressor run with low suction pressure according to the refrigerating circuit of exemplary embodiment described herein, and owing to which saving the oil eliminator of the on high-tension side costliness of compressor, therefore it is more cheap.In addition, for transcritical CO_2 system, the demand to Agglomerate Filter and maintenance is which obviated.Refrigerating circuit according to exemplary embodiment described herein is sucking level run with first and is using excessive oil in the first compressor bank of formation low pressure compressor, in oil interceptor, collect excessive oil, and sucking level run with second and promoting excessive oil as required in the second compressor bank of formation high pressure compressor.
Should be appreciated that term " compressor bank " is the compressor comprising any amount only having a compressor.The number of the compressor of every compressor bank can be different.
Refrigerating circuit can comprise: economizer, and described economizer has energy-conservation bloating plant, and described energy-conservation bloating plant is for expanding from the some refrigerant stream of heat rejection heat exchanger; Economizer heat exchanger, a part for the cold-producing medium flowed against the refriger-ant section stream expanded points to energy-conservation bloating plant and evaporimeter from heat rejection heat exchanger with cooling in the downstream that described economizer heat exchanger is arranged in heat rejection heat exchanger; And second at least one compressor of compressor bank, its outlet pressure of at least one compressor for refriger-ant section stream being compressed to first group before refriger-ant section stream is supplied to pressure line.
Magnetic valve or check (non-return) valve can be set at least one compressor place of the second compressor bank.At least one compressor of second compressor bank also can be called as energy-saving compressor.
Refrigerating circuit can comprise be connected to oil interceptor low-voltage circuit to reduce the pressure in oil interceptor.Reduce the pressure support ventilation in oil interceptor and enhance oil to flow to oil interceptor from compressor.
Refrigerating circuit can comprise the excessive oil circuit that oil interceptor is connected at least one compressor of the first compressor bank by least one.Excessive oil circuit allows oil to flow to oil interceptor from the compressor of the first compressor bank.
Excessive oil circuit can lead to the oil groove of the compressor of described first compressor bank above the minimum oil level of the definition of described oil groove.The aperture arrangement of excessive oil circuit is avoided above the minimum oil level of the hydraulic shrinking machine of the first compressor bank and extracts oil by corresponding excessive oil circuit from oil groove and cause oil level to be decreased to below minimum oil level.
High-tension line can be connected to the outlet side of at least one compressor of first group.Outlet side high-tension line being connected at least one of these compressors allows the pressure increased when the pressure generator/compressor not needing to add in high-tension line.
Refrigerating circuit can comprise and is arranged in choke valve in excessive oil circuit or check valve.Be arranged in choke valve in excessive oil circuit or check valve to avoid the pressure increased in oil interceptor and balanced immediately by low-voltage circuit.Otherwise it allows the pressure increased in oil interceptor to be kept a period of time, thus oil is passed to the compressor of the second compressor bank from oil interceptor.
Refrigerating circuit can comprise the switchable valve be arranged in fuel feeding circuit, oil interceptor is connected at least one compressor of the second compressor bank by this switchable valve, selectively to allow and not allow oil to flow between oil interceptor and at least one compressor of the second compressor bank.
Refrigerating circuit can comprise the switchable valve be arranged in low-voltage circuit and/or the switchable valve be arranged in high-tension line, selectively oil interceptor is connected to high-tension line and low-voltage circuit, to allow selectively to increase and reduce the pressure in oil interceptor.The pressure permission support oil increased and reduce in oil interceptor is to oil interceptor with from oil interceptor transmission.
Low-voltage circuit can be connected to the suction side of at least one compressor of the first compressor bank.Low-voltage circuit is connected to the suction side of at least one in compressor and provides a kind of straightforward procedure reducing the pressure in oil interceptor when not needing the pressure regulating equipment added.
Low-voltage circuit can be connected to escaper, and this escaper to be arranged in the suction circuit of at least one compressor of the first compressor bank and to be configured for the pressure reduced in low-voltage circuit.Low-voltage circuit being connected to escaper allows the pressure in low-voltage circuit and oil interceptor to be reduced to below the suction pressure of the compressor of described first compressor bank, oil is sucked oil interceptor from the compressor of the first compressor bank.
Refrigerating circuit also can comprise high pressure valve or high-tension apparatus and be arranged in the refrigerant collecting container of bloating plant upstream.This allows to provide the double expansion loop comprising high-pressure section and intermediate pressure section.
Refrigerating circuit can comprise at least one compressor of suction pressure three compressor bank less than the compressor of the first compressor bank, and low-voltage circuit can be connected to the entrance side of at least one compressor of described 3rd compressor bank.The suction pressure of the compressor of the 3rd compressor bank is less than the compressor of the first compressor bank, this provides a kind of selection arranging low pressure in oil interceptor, oil is sucked oil interceptor from the compressor of the first compressor bank.
The compressor of the first compressor bank can be this compressor: it is configured to carry out normal refrigerating operaton being greater than at the temperature of 0 DEG C, and the compressor of the 3rd compressor bank can be this compressor: it is configured for and carries out freezing operation being less than at the temperature of 0 DEG C.This permission provides cryogenic temperature and cryogenic temperature with single refrigerating circuit.
Oil interceptor can have the form of the pipe that basic horizontal is arranged.The oil interceptor being formed as pipe can easily manufacture with low cost and not occupy large quantity space, thus it can easily be integrated in refrigerating circuit.The pipe forming oil interceptor can be arranged to allow the collective low oil at pipe relative to level a little obliquely.
High-tension line and/or low-voltage circuit can to the open tops of oil interceptor.Because liquid oil will drop on the bottom of oil interceptor, this will make liquid oil and gas phase separation, and form foam when avoiding the cold-producing medium at gaseous state to be imported in oil interceptor to increase the pressure in oil interceptor by high-tension line.
Oil interceptor can be arranged in the horizontal plane below the compressor of the first compressor bank.Horizontal plane below compressor oil interceptor being arranged in the first compressor bank, this allows oil to flow to oil interceptor by weight-driven from the compressor of the first compressor bank.If the vertical distance between the horizontal plane of the compressor of the first compressor bank and the horizontal plane of oil interceptor is enough large, the pressure in oil interceptor can not be needed to be decreased to below the suction pressure of the compressor of the first compressor bank, because oil is passed to oil interceptor by means of only gravity from the compressor of the first compressor bank.
Refrigerating circuit can comprise at least one oil sensor to determine the oil level at least one compressor and/or oil interceptor.Oil sensor allows the transmission starting and stop oil based on the actual oil level in hydraulic shrinking machine and/or oil interceptor respectively, and this allows very efficient between compressor and accurately compensates oil.
For the method that oil is passed at least one compressor of the second compressor bank from least one compressor of the first compressor bank being comprised step by oil interceptor: oil groove oil interceptor fluid being connected to the compressor of the first compressor bank; Oil is sucked oil interceptor from the oil groove of the compressor of the first compressor bank below suction pressure pressure in oil interceptor being reduced to the compressor of the first compressor bank; Oil interceptor fluid is connected to the compressor of the second compressor bank; By on the pressure increase in oil interceptor to the suction pressure of the compressor in the second compressor bank oil to be supplied to the compressor of the second compressor bank from oil interceptor.
The step increasing the pressure in oil interceptor can comprise step oil interceptor fluid being connected to the outlet side of at least one in compressor.This increases the pressure in oil interceptor when not needing the supercharging equipment added.
The step reducing pressure can comprise step oil interceptor fluid being connected to the entrance side of at least one in compressor.This reduces the pressure in oil interceptor when not needing the pressure regulating equipment added.
Reduce the step of pressure and can comprise step oil interceptor fluid being connected to the escaper of layout within the compressor at least one suction circuit.Pressure in oil interceptor is reduced to even below the suction pressure of described compressor by this permission.
Oil subsidy compensation method between at least two compressors can comprise the step that at least one compressor started when the step of the oil level at least one compressor of monitoring first compressor bank and the oil level in the compressor of the first compressor bank increase on predetermined value from least one compressor of the first compressor bank to the second compressor bank transmits oil.
Oil subsidy compensation method between at least two compressors can comprise the step that the compressor started when the step of the oil level at least one compressor of monitoring second compressor bank and the oil level in the compressor of the second compressor bank drop to below predetermined value from least one compressor of the first compressor bank to the second compressor bank transmits oil.This reliably avoid because oil consumption mistake causes the compressor of the second compressor bank to block or damage.
Although describe the present invention with reference to exemplary embodiment, it will be appreciated by those skilled in the art that when not departing from the scope of the invention, various change can be made and equivalent can be utilized to replace its element.In addition, when not departing from essential scope of the present invention, instruction according to the present invention amendment can be made to adapt to special situation or material.Therefore, this means to the invention is not restricted to disclosed specific embodiment, but the present invention will comprise all embodiments fallen in the scope of claims.
Reference numeral
2: refrigerating circuit
3: suck circuit
4a, 4b, 4c: first kind compressor
5: high-pressure discharge circuit
6: heat rejection heat exchanger
7a, 7b, 7c: the oil groove of first kind compressor
8: bloating plant
9a, 9b, 9c: the minimum oil level of first kind compressor
10: evaporimeter
12: Second Type compressor
13: the oil groove of Second Type compressor
14: economizer heat exchanger
14a: the Part I of economizer heat exchanger
14b: the Part II of economizer heat exchanger
15: the oil level of Second Type compressor
16: energy-conservation bloating plant
17: high pressure valve
18: refrigerant collecting container
22: excessive oil circuit
24: check valve
26: oil interceptor
26a: the upper end of oil interceptor
26b: the bottom of oil interceptor
28a, 28b: detect glass
30: fuel feeding circuit
32: delivery valve
34: oil sensor
36: high-tension line
38: high pressure valve
40: low-voltage circuit
42: switchable valve
44: escaper
The inlet line of 46: the three groups of compressors
48: the three groups of compressors
50: refrigerating evaporator
52: freezing bloating plant
54: refrigerating circuit

Claims (23)

1. a refrigerating circuit (2), it makes refrigerant circulation and comprises in the flowing direction:
At least one compressor (4a, 4b, 4c) of first compressor bank;
Heat rejection heat exchanger (6);
Bloating plant (8); With
Evaporimeter (10);
Described refrigerating circuit (2) also comprises:
At least one compressor (12) of second compressor bank, wherein, the suction pressure of the described compressor (12) of described second compressor bank is greater than the suction pressure of the described compressor (4a, 4b, 4c) of described first compressor bank;
Oil interceptor (26), the described compressor (4a, 4b, 4c) that described oil interceptor (26) optionally can be connected to described first compressor bank and/or be connected to described second compressor bank described compressor (12) to collect excessive oil from least one compressor (4a, 4b, 4c) described in described first compressor bank;
Wherein, described oil interceptor (26) optionally can be connected to high-tension line (36) to increase the pressure in described oil interceptor (26), thus oil is delivered to described at least one compressor (12) of described second compressor bank from described oil interceptor (26).
2. refrigerating circuit according to claim 1 (2), it comprises economizer, and described economizer has:
Energy-conservation bloating plant (16), it expands for making the some refrigerant stream from described heat rejection heat exchanger (6);
Economizer heat exchanger (14), described bloating plant (8) is pointed to and the cold-producing medium that point to described evaporimeter (10) and flow against the refriger-ant section stream expanded from described heat rejection heat exchanger (6) with cooling in its downstream being arranged in described heat rejection heat exchanger (6); And
Wherein, described refriger-ant section stream was compressed to the outlet pressure of at least one compressor (4a, 4b, 4c) described in the first compressor bank by described at least one compressor (12) of described second compressor bank before described refriger-ant section stream is supplied to pressure line.
3. refrigerating circuit according to claim 1 and 2 (2), also comprise be connected to described oil interceptor (26) low-voltage circuit (40) to reduce the pressure in described oil interceptor (26).
4. refrigerating circuit according to claim 1 and 2 (2), also comprise at least one excessive oil circuit (22), at least one in the compressor (4a, 4b, 4c) of described first compressor bank is connected to described oil interceptor (26) by described at least one excessive oil circuit (22), wherein, described excessive oil circuit (22) leads to the oil groove (7a, 7b, 7c) of described compressor (4a, 4b, 4c) on minimum oil level (9a, 9b, 9c).
5. refrigerating circuit according to claim 1 and 2 (2), wherein, high-tension line (36) to be connected in the compressor (4a, 4b, 4c) of described first compressor bank at least one pressure line (5).
6. refrigerating circuit according to claim 4 (2), also comprises and is arranged in throttling in described excessive oil circuit (22) or check valve (24).
7. refrigerating circuit according to claim 1 and 2 (2), also comprise the delivery valve (32) be arranged in fuel feeding circuit (30), described oil interceptor (26) is connected at least one compressor (12) of described second compressor bank by described fuel feeding circuit (30).
8. refrigerating circuit according to claim 3 (2), also comprises the switchable valve (42) be arranged in described low-voltage circuit (40) and/or the switchable valve (38) be arranged in described high-tension line (36).
9. refrigerating circuit according to claim 3 (2), wherein, described low-voltage circuit (40) can be connected to the suction circuit (3) of at least one compressor (4a, 4b, 4c) of described first compressor bank.
10. refrigerating circuit according to claim 9 (2), wherein, described low-voltage circuit (40) can be connected to escaper (44), and described escaper (44) to be arranged in the suction circuit (3) of at least one compressor (4a, 4b, 4c) of described first compressor bank and to be arranged to the pressure reduced in described low-voltage circuit (40).
11. refrigerating circuits according to claim 1 and 2 (2), also comprise high pressure valve (17) and refrigerant collecting container (18), described high pressure valve (17) and described refrigerant collecting container (18) are disposed between described heat rejection heat exchanger (6) and described bloating plant (8) on the flow direction of described cold-producing medium.
12. refrigerating circuits according to claim 3 (2), also comprise at least one compressor (48) of the 3rd compressor bank, it has suction pressure lower compared with the described compressor (4a, 4b, 4c) of described first compressor bank, wherein, described low-voltage circuit (40) can be connected to the entrance of at least one compressor (48) of described 3rd compressor bank.
13. refrigerating circuits according to claim 12 (2), wherein, the described compressor (4a, 4b, 4c) of described first compressor bank is the compressor (4a, 4b, 4c) being arranged to normal refrigerating operaton, and the compressor (48) of described 3rd compressor bank is the compressor being configured for freezing operation.
14. refrigerating circuits according to claim 1 and 2 (2), wherein, described oil interceptor (26) has the form of the pipe that basic horizontal is arranged.
15. refrigerating circuits according to claim 3 (2), wherein, described high-tension line (36) and/or described low-voltage circuit (40) are connected to the top of described oil interceptor (26).
16. refrigerating circuits according to claim 1 and 2 (2), wherein, described oil interceptor (26) is arranged in described compressor (4a, 4b, 4c) level below in described first compressor bank.
17. refrigerating circuits according to claim 1 and 2 (2), comprise at least one oil sensor (34) to detect in described compressor (4a, 4b, 4c, 12,48) oil level at least one oil level and/or described oil interceptor (26).
Oil is delivered to the method for at least one compressor (12) of the second compressor bank by oil interceptor (26) by 18. from least one compressor (4a, 4b, 4c) of the first compressor bank, described oil interceptor (26) optionally can be connected to described compressor (4a, 4b, 4c, 12), and described method comprises step:
Described oil interceptor (26) fluid is connected to the oil groove (7a, 7b, 7c) of the described compressor (4a, 4b, 4c) of described first compressor bank;
Below the suction pressure of described compressor (4a, 4b, 4c) pressure in described oil interceptor (26) being reduced to described first compressor bank, oil is drawn into described oil interceptor (26) from the described oil groove (7a, 7b, 7c) of the described compressor (4a, 4b, 4c) of described first compressor bank;
Described oil interceptor (26) fluid is connected to the described compressor (12) of described second compressor bank;
Increase the pressure in described oil interceptor (26) and/or reduce the suction pressure of described compressor (12) of described second compressor bank, become larger than the suction pressure of the described compressor (12) of described second compressor bank, oil to be supplied to the described compressor (12) of described second compressor bank from described oil interceptor (26) to make the pressure in described oil interceptor (26).
19. methods according to claim 18, wherein, increase the step of pressure in described oil interceptor (26) and comprise the pressure line described oil interceptor (26) fluid being connected in described compressor (4a, 4b, 4c, 12,48) at least one.
20. methods according to claim 18 or 19, wherein, the step reducing pressure in described oil interceptor (26) comprises the suction circuit described oil interceptor (26) fluid being connected in described compressor (4a, 4b, 4c, 12,48) at least one.
21. methods according to claim 18 or 19, wherein, reduce the step of pressure in described oil interceptor (26) and comprise the escaper (44) be connected to by described oil interceptor (26) fluid in the suction circuit being arranged in described compressor (4a, 4b, 4c, 12,48) at least one.
22. compensate oily method between at least two compressors (4a, 4b, 4c, 12) of two different compressors groups, comprise step:
Monitor the oil level at least one compressor (12) of the second compressor bank; And
If the oil level in the described compressor (12) of the second compressor bank drops to below predetermined minimum of a value, use the method described in claim 18 to 21 any one, oil is passed to the described compressor (12) of described second compressor bank from least one compressor (4a, 4b, 4c) of the first compressor bank.
23. compensate oily method between at least two compressors (4a, 4b, 4c, 12) of two different compressors groups, comprise step:
Monitor the oil level at least one compressor (4a, 4b, 4c) of the first compressor bank; And
If the oil level at least one compressor (4a, 4b, 4c) of described first compressor bank rises on predetermined maximum, use the method described in claim 18 to 21 any one, oil is passed to the compressor (12) of the second compressor bank from least one compressor (4a, 4b, 4c) of described first compressor bank.
CN201180072300.5A 2011-07-14 2011-07-14 There is the refrigerating circuit that oil subsidy is repaid Expired - Fee Related CN103649653B (en)

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