EP1686333B1 - Air conditioner - Google Patents
Air conditioner Download PDFInfo
- Publication number
- EP1686333B1 EP1686333B1 EP05109697A EP05109697A EP1686333B1 EP 1686333 B1 EP1686333 B1 EP 1686333B1 EP 05109697 A EP05109697 A EP 05109697A EP 05109697 A EP05109697 A EP 05109697A EP 1686333 B1 EP1686333 B1 EP 1686333B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- compressor
- refrigerant
- auxiliary
- accumulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
- 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
- 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
- F25B41/40—Fluid line 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
Definitions
- the present invention relates to an air conditioning system.
- the present invention relates to an air conditioning system including an air conditioning system including a main compressor, at least one auxiliary compressor and an accumulator disposed in a refrigeration circuit, the main and auxiliary compressors being connected by an oil transfer conduit through which oil may be supplied from the main compressor to the auxiliary compressor and the oil transfer conduit communicates with the main compressor so that, when the amount of oil in the main compressor reaches a predetermined level, it flows into the auxiliary compressor via the oil transfer conduit, wherein the accumulator is operable to supply refrigerant to the main and auxiliary compressors, respectively and the accumulator is configured to collect oil contained in the refrigerant and supply it, together with refrigerant, to the main compressor only.
- Such an air conditioning system is known from US 4 672 822 .
- Air conditioning systems are installed in buildings to heat or cool the interior and include refrigerating devices such as a compressor for compressing refrigerant, a condenser for cooling high-pressure-and-high-temperature refrigerant compressed in the compressor, an expansion device for decompressing and expanding the cooled refrigerant, and an evaporator for performing heat exchange between refrigerant and air to evaporate the refrigerant.
- refrigerating devices such as a compressor for compressing refrigerant, a condenser for cooling high-pressure-and-high-temperature refrigerant compressed in the compressor, an expansion device for decompressing and expanding the cooled refrigerant, and an evaporator for performing heat exchange between refrigerant and air to evaporate the refrigerant.
- Korean Patent Application No. 10-2002-0023990 discloses a refrigerating system including a plurality of compressors some or all of which operate depending on the refrigerating load.
- oil is reserved in the respective compressors employed in the refrigerating system and each compressor is equipped with an oil-distribution pipe to uniformly distribute oil to plural compressors such that oil is delivered to or from neighbouring compressors.
- the conventional refrigerating system further includes an electronically controlled additional valve installed at the intermediate portion of the oil distribution pipe and oil-shortage is prevented by controlling the valve to close the oil-distribution pipe when any one of the compressors operates.
- the present invention has been made in view of the above-mentioned problems, and the invention seeks to provide an air conditioning system having a simple structure without additional devices or control and preventing oil-shortage in respective compressors.
- the invention is characterised in that the end of the oil transfer conduit remote from the main compressor communicates with an auxiliary suction pipe to supply oil from the main compressor to the auxiliary compressor together with the refrigerant supplied to the auxiliary compressor through the auxiliary suction pipe.
- refrigerant and oil is supplied to the main compressor from the accumulator via a main suction pipe having a portion which extends through an oil reservoir in the accumulator, said portion including an oil overflow aperture spaced from the end of the pipe through which refrigerant is introduced for the flow of oil into the pipe from the reservoir when the oil in the reservoir exceeds a predetermined level.
- refrigerant is supplied to the auxiliary compressor from the accumulator via the auxiliary suction pipe having a portion that extends through the oil reservoir in the accumulator, said portion having an end through which refrigerant is introduced into the auxiliary suction pipe and which is disposed above the oil overflow aperture in the main suction pipe.
- the refrigeration circuit includes an oil separator for separating oil from the refrigerant and for supplying the separated oil to the accumulator.
- the refrigeration circuit includes a condenser, an evaporator, an expansion device and an oil bypass conduit, the oil bypass conduit extending between the oil separator and the accumulator to allow oil to flow therethrough and bypass the condenser, expansion device and evaporator.
- a capillary tube is disposed in the oil bypass conduit to control the flow of oil from the oil separator into the accumulator.
- the auxiliary compressor is selectively operated based on refrigeration load to compress refrigerant.
- the portion of each of the main suction pipe and the auxiliary pipe which extends through an oil reservoir in the accumulator penetrates a bottom surface of the accumulator and upstands from the bottom surface, and the oil overflow aperture is formed at a position lower that then end of the portion of the auxiliary pipe through which refrigerant is introduced into the auxiliary pipe.
- an end of the oil transfer conduit is installed to a side of the main compressor corresponding to a predetermined height of oil in the main compressor.
- the air conditioner further comprises a capillary tube installed at an intermediate portion of the oil transfer conduit to control the flow of oil from the main compressor into the auxiliary compressor.
- a refrigerating system includes devices, such as compressors 1a and 1b for compressing refrigerant at high pressure and high temperature and for reserving oil to cool and lubricate inner driving parts of the compressors 1a and 1b, a condenser 2 for performing heat exchange between refrigerant and air to cool refrigerant, an expansion device 3 for decompressing and expanding refrigerant, and an evaporator 4 in which heat exchange between refrigerant and air is performed and refrigerant is evaporated.
- the expansion device 3 includes a capillary tube.
- the refrigerating system further includes an oil separator 5 installed at the intermediate portion of a discharge pipe 7a for guiding refrigerant discharged from the compressor 1a and 1b to separate oil discharged with refrigerant from the compressors 1a and 1b from refrigerant, and an accumulator 6 installed at the intermediate portions of suction pipes 7b and 7c for guiding refrigerant to the compressors 1a and 1b to prevent liquid refrigerant from entering the compressors 1a and 1b.
- an oil separator 5 installed at the intermediate portion of a discharge pipe 7a for guiding refrigerant discharged from the compressor 1a and 1b to separate oil discharged with refrigerant from the compressors 1a and 1b from refrigerant
- an accumulator 6 installed at the intermediate portions of suction pipes 7b and 7c for guiding refrigerant to the compressors 1a and 1b to prevent liquid refrigerant from entering the compressors 1a and 1b.
- an oil return pipe or oil bypass conduit 7d is installed between the oil separator 5 and the accumulator 6.
- One end of the oil return pipe 7d is connected to the lower side of the oil separator 5 and the other end of the oil bypass conduit 7d is connected to a refrigerant pipe 7f for guiding refrigerant to the accumulator 6.
- a first capillary tube 8a is installed at the intermediate portion of the oil bypass conduit 7d to increase flow resistance of the oil bypass conduit 7d such that flow rate of oil flowing through the oil bypass conduit 7d can be controlled by the first capillary tube 8a.
- the refrigerating system further includes a plurality of compressors 1a and 1b.
- One of the compressors 1a and 1b is a main compressor 1a for receiving refrigerant and oil from the accumulator 6 and the other of the compressors 1a and 1b is an auxiliary compressor 1b for receiving refrigerant from the accumulator 6 and receiving oil from the main compressor 1a.
- a refrigerating system having only one auxiliary compressor 1b will be described for convenience's sake.
- a main suction pipe 7b is connected between the main compressor 1a and the accumulator 6 such that refrigerant and oil are delivered from the accumulator 6 to the main compressor 1a
- an auxiliary suction pipe 7c is connected between the auxiliary compressor 1b and the accumulator 6 such that refrigerant is delivered from the accumulator 6 to the auxiliary compressor 1b, and thus the main compressor 1a and the auxiliary compressor 1b can receive refrigerant from one accumulator 6.
- refrigerant is delivered to the main compressor 1a and the auxiliary compressor 1b through the main suction pipe 7b and the auxiliary suction pipe 7c, while oil reserved in the accumulator 6 is delivered only to the main compressor 1a through the main suction pipe 7b having the oil introducing hole 9.
- the refrigerating system further includes an oil delivery pipe or oil transfer conduit 7e for delivering excess oil to the auxiliary compressor 1b when the main compressor 1a reserves oil more than a predetermined quantity of oil.
- the oil transfer conduit 7e is installed such that one end of the oil transfer conduit 7e is installed at a predetermined height to correspond to a predetermined height of oil in the main compressor 1a and the other end of the oil transfer conduit 7e is connected to the intermediate portion of the auxiliary suction pipe 7c.
- the excess oil is delivered to the auxiliary suction pipe 7c via the oil transfer conduit 7e to be supplied to the auxiliary compressor 1b.
- oil in the main compressor 1a can be maintained at the predetermine height.
- the oil transfer conduit 7e is provided with a second capillary tube 8b installed at the intermediate portion of the oil transfer conduit 7e to increase flow resistance of the oil transfer conduit 7e such that flow rate of oil flowing to the auxiliary compressor 1b is adjusted by the second capillary tube 8b.
- the main compressor 1a Since the main compressor 1a is delivered with oil discharged from the main compressor 1a and the auxiliary compressor 1b, the main compressor 1a is supplied with more oil than the predetermined quantity. Since the main compressor 1a is provided with one end of the oil transfer conduit 7e installed to correspond to the predetermined height of oil such that excess oil more than the predetermined quantity of oil in the main compressor 1a is delivered to the auxiliary compressor 1b through the oil transfer conduit 7e, oil in the main compressor 1a and the auxiliary compressor 1b can be maintained at the predetermined height, respectively.
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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)
- Compressor (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Description
- The present invention relates to an air conditioning system. In particular, the present invention relates to an air conditioning system including an air conditioning system including a main compressor, at least one auxiliary compressor and an accumulator disposed in a refrigeration circuit, the main and auxiliary compressors being connected by an oil transfer conduit through which oil may be supplied from the main compressor to the auxiliary compressor and the oil transfer conduit communicates with the main compressor so that, when the amount of oil in the main compressor reaches a predetermined level, it flows into the auxiliary compressor via the oil transfer conduit, wherein the accumulator is operable to supply refrigerant to the main and auxiliary compressors, respectively and the accumulator is configured to collect oil contained in the refrigerant and supply it, together with refrigerant, to the main compressor only. Such an air conditioning system is known from
US 4 672 822 . - Air conditioning systems are installed in buildings to heat or cool the interior and include refrigerating devices such as a compressor for compressing refrigerant, a condenser for cooling high-pressure-and-high-temperature refrigerant compressed in the compressor, an expansion device for decompressing and expanding the cooled refrigerant, and an evaporator for performing heat exchange between refrigerant and air to evaporate the refrigerant.
- Korean Patent Application No.
10-2002-0023990 - Moreover, in order to cool and lubricate respective driving parts, oil is reserved in the respective compressors employed in the refrigerating system and each compressor is equipped with an oil-distribution pipe to uniformly distribute oil to plural compressors such that oil is delivered to or from neighbouring compressors.
- However, in a conventional system, when only one of the plural compressors operates, since the operating compressor compresses refrigerant and interior pressure of the operating compressor is increased, oil reserved in the operating compressor flows to a compressor having relatively high inner pressure because of non-operation, oil in the operating compressor is insufficient.
- Thus, in order to overcome the above problem, the conventional refrigerating system further includes an electronically controlled additional valve installed at the intermediate portion of the oil distribution pipe and oil-shortage is prevented by controlling the valve to close the oil-distribution pipe when any one of the compressors operates.
- However, since the conventional refrigerating system has to use an electronically controlled valve, costs for manufacturing the refrigerating system are increased. Moreover, since the valve must be controlled, control of the conventional refrigerating system is complicated.
- The present invention has been made in view of the above-mentioned problems, and the invention seeks to provide an air conditioning system having a simple structure without additional devices or control and preventing oil-shortage in respective compressors.
- Accordingly, the invention is characterised in that the end of the oil transfer conduit remote from the main compressor communicates with an auxiliary suction pipe to supply oil from the main compressor to the auxiliary compressor together with the refrigerant supplied to the auxiliary compressor through the auxiliary suction pipe.
- In a preferred embodiment, refrigerant and oil is supplied to the main compressor from the accumulator via a main suction pipe having a portion which extends through an oil reservoir in the accumulator, said portion including an oil overflow aperture spaced from the end of the pipe through which refrigerant is introduced for the flow of oil into the pipe from the reservoir when the oil in the reservoir exceeds a predetermined level.
- Preferably, refrigerant is supplied to the auxiliary compressor from the accumulator via the auxiliary suction pipe having a portion that extends through the oil reservoir in the accumulator, said portion having an end through which refrigerant is introduced into the auxiliary suction pipe and which is disposed above the oil overflow aperture in the main suction pipe.
- Preferably, the refrigeration circuit includes an oil separator for separating oil from the refrigerant and for supplying the separated oil to the accumulator.
- Advantageously, the refrigeration circuit includes a condenser, an evaporator, an expansion device and an oil bypass conduit, the oil bypass conduit extending between the oil separator and the accumulator to allow oil to flow therethrough and bypass the condenser, expansion device and evaporator.
- In one embodiment a capillary tube is disposed in the oil bypass conduit to control the flow of oil from the oil separator into the accumulator.
- Conveniently, the auxiliary compressor is selectively operated based on refrigeration load to compress refrigerant.
- Advantageously, the portion of each of the main suction pipe and the auxiliary pipe which extends through an oil reservoir in the accumulator penetrates a bottom surface of the accumulator and upstands from the bottom surface, and the oil overflow aperture is formed at a position lower that then end of the portion of the auxiliary pipe through which refrigerant is introduced into the auxiliary pipe.
- Preferably, an end of the oil transfer conduit is installed to a side of the main compressor corresponding to a predetermined height of oil in the main compressor.
- In one embodiment, the air conditioner further comprises a capillary tube installed at an intermediate portion of the oil transfer conduit to control the flow of oil from the main compressor into the auxiliary compressor.
- Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
- Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
-
Figure 1 is a schematic view illustrating a refrigerating system according to a preferred embodiment of the present invention when both a main compressor and an auxiliary compressor are operated; -
Figure 2 is a schematic view illustrating the refrigerating system according to the preferred embodiment of the present invention when only the main compressor is operated; and -
Figure 3 is a sectional view illustrating an accumulator employed in the refrigerating system according to the preferred embodiment of the present invention. - A refrigerating system according to the preferred embodiment of the present invention, as shown in
Figure 1 , includes devices, such ascompressors compressors - Moreover, the refrigerating system further includes an oil separator 5 installed at the intermediate portion of a
discharge pipe 7a for guiding refrigerant discharged from thecompressor compressors accumulator 6 installed at the intermediate portions ofsuction pipes compressors compressors - Between the oil separator 5 and the
accumulator 6, an oil return pipe oroil bypass conduit 7d is installed to guide oil separated by the oil separator 5 to enter theaccumulator 6. One end of theoil return pipe 7d is connected to the lower side of the oil separator 5 and the other end of theoil bypass conduit 7d is connected to a refrigerant pipe 7f for guiding refrigerant to theaccumulator 6. In addition, at the intermediate portion of theoil bypass conduit 7d, a firstcapillary tube 8a is installed to increase flow resistance of theoil bypass conduit 7d such that flow rate of oil flowing through theoil bypass conduit 7d can be controlled by the firstcapillary tube 8a. - In order to flexibly adapt to refrigeration load, the refrigerating system according to the preferred embodiment of the present invention further includes a plurality of
compressors compressors main compressor 1a for receiving refrigerant and oil from theaccumulator 6 and the other of thecompressors auxiliary compressor 1b for receiving refrigerant from theaccumulator 6 and receiving oil from themain compressor 1a. In the preferred embodiment of the present invention, a refrigerating system having only oneauxiliary compressor 1b will be described for convenience's sake. - A
main suction pipe 7b is connected between themain compressor 1a and theaccumulator 6 such that refrigerant and oil are delivered from theaccumulator 6 to themain compressor 1a, and anauxiliary suction pipe 7c is connected between theauxiliary compressor 1b and theaccumulator 6 such that refrigerant is delivered from theaccumulator 6 to theauxiliary compressor 1b, and thus themain compressor 1a and theauxiliary compressor 1b can receive refrigerant from oneaccumulator 6. - One end of the
main suction pipe 7b and one end of theauxiliary suction pipe 7c, which are connected to theaccumulator 6, as shown inFIG. 3 , penetrate a bottom surface of theaccumulator 6 and protrude at a predetermined height in theaccumulator 6, while themain suction pipe 7b installed in theaccumulator 6 has anoil introducing hole 9 formed at the lower side of themain suction pipe 7b to introduce oil reserved in the lower side of theaccumulator 6. Thus, refrigerant is delivered to themain compressor 1a and theauxiliary compressor 1b through themain suction pipe 7b and theauxiliary suction pipe 7c, while oil reserved in theaccumulator 6 is delivered only to themain compressor 1a through themain suction pipe 7b having theoil introducing hole 9. - Moreover, the refrigerating system according to the preferred embodiment of the present invention further includes an oil delivery pipe or oil transfer conduit 7e for delivering excess oil to the
auxiliary compressor 1b when themain compressor 1a reserves oil more than a predetermined quantity of oil. - The oil transfer conduit 7e is installed such that one end of the oil transfer conduit 7e is installed at a predetermined height to correspond to a predetermined height of oil in the
main compressor 1a and the other end of the oil transfer conduit 7e is connected to the intermediate portion of theauxiliary suction pipe 7c. When more quantity of oil than the predetermined quantity is supplied to themain compressor 1a, the excess oil is delivered to theauxiliary suction pipe 7c via the oil transfer conduit 7e to be supplied to theauxiliary compressor 1b. Thus, oil in themain compressor 1a can be maintained at the predetermine height. The oil transfer conduit 7e is provided with a secondcapillary tube 8b installed at the intermediate portion of the oil transfer conduit 7e to increase flow resistance of the oil transfer conduit 7e such that flow rate of oil flowing to theauxiliary compressor 1b is adjusted by the secondcapillary tube 8b. - Operation of the refrigerating system according to the preferred embodiment of the present invention will be described as follows.
- In the case that only the
main compressor 1a operates to compress refrigerant, when themain compressor 1a compresses refrigerant, some of oil reserved in themain compressor 1a is discharged together with refrigerant to thedischarge pipe 7a. Oil discharged through thedischarge pipe 7a is withdrawn by the oil separator 5 and theaccumulator 6. Since oil accumulated in theaccumulator 6 is delivered only to themain compressor 1a through themain suction pipe 7b having theoil introducing hole 9, the majority of oil discharged from themain compressor 1a is returned to themain compressor 1a as it is. Thus, oil in themain compressor 1a can be continuously maintained at the predetermined height. - In the case that both the
main compressor 1a and theauxiliary compressor 1b operate to compress refrigerant, when themain compressor 1a and theauxiliary compressor 1b compress refrigerant, some of oil reserved in themain compressor 1a and theauxiliary compressor 1b is discharged together with refrigerant to thedischarge pipe 7a. Oil discharged through thedischarge pipe 7a is withdrawn by the oil separator 5 and theaccumulator 6, and is delivered to themain compressor 1a through themain suction pipe 7b having theoil introducing hole 9. - Since the
main compressor 1a is delivered with oil discharged from themain compressor 1a and theauxiliary compressor 1b, themain compressor 1a is supplied with more oil than the predetermined quantity. Since themain compressor 1a is provided with one end of the oil transfer conduit 7e installed to correspond to the predetermined height of oil such that excess oil more than the predetermined quantity of oil in themain compressor 1a is delivered to theauxiliary compressor 1b through the oil transfer conduit 7e, oil in themain compressor 1a and theauxiliary compressor 1b can be maintained at the predetermined height, respectively. - As described above, in the refrigerating system according to the present invention, all of oil reserved in the accumulator is delivered to the main compressor and oil more than the predetermined quantity supplied to the main compressor is delivered to the auxiliary compressor through the oil bypass conduit. Thus, when only the main compressor operates, since oil discharged from the main compressor is supplied to the main compressor as it is, oil in the main compressor can be maintained at the predetermined height. When both the main compressor and the auxiliary compressor operate, oil more than the predetermined quantity is supplied to the main compressor and excess oil is delivered to the auxiliary compressor such that oil in the main compressor and the auxiliary compressor can be maintained at the predetermined height. Thus, a simple mechanical structure without a separate control prevents oil-shortage in the main compressor and the auxiliary compressor
- Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the scope of the invention, which is defined in the claims.
Claims (9)
- An air conditioning system including a main compressor (1a), at least one auxiliary compressor (1b) and an accumulator (6) disposed in a refrigeration circuit, the main and auxiliary compressors (1a, 1b) being connected by an oil transfer conduit (7e) through which oil may be supplied from the main compressor (1a) to the auxiliary compressor (1b) and the oil transfer conduit (7e) communicates with the main compressor (1a) so that, when the amount of oil in the main compressor (1a) reaches a predetermined level, it flows into the auxiliary compressor (1b) via the oil transfer conduit (7e), wherein the accumulator (6) is operable to supply refrigerant to the main and auxiliary compressors (1a, 1b), respectively, and the accumulator (6) is configured to collect oil contained in the refrigerant and supply it, together with refrigerant, to the main compressor (1a) only characterised in that the end of the oil transfer conduit (7e) remote from the main compressor (1a) communicates with an auxiliary suction pipe (7c) to supply oil from the main compressor (1a) to the auxiliary compressor (1b) together with the refrigerant supplied to the auxiliary compressor (1b) through the auxiliary suction pipe (7c).
- An air conditioning system according to claim 1 wherein refrigerant and oil is supplied to the main compressor (1a) from the accumulator (6) via a main suction pipe (7b) having a portion which extends through an oil reservoir in the accumulator (6), said portion including an oil overflow aperture (9) spaced from the end of the pipe (7b) through which refrigerant is introduced for the flow of oil into the pipe from the reservoir when the oil in the reservoir exceeds a predetermined level.
- An air conditioning system according to claim 2 wherein refrigerant is supplied to the auxiliary compressor (1b) from the accumulator (6) via the auxiliary suction pipe (7c) having a portion that extends through the oil reservoir in the accumulator (6), said portion having an end through which refrigerant is introduced into the auxiliary suction pipe (7c) and which is disposed above the oil overflow aperture (9) in the main suction pipe (7b).
- An air conditioning system according to any preceding claim wherein the refrigeration circuit includes an oil separator (5) for separating oil from the refrigerant and for supplying the separated oil to the accumulator (6).
- An air conditioning system according to claim 4 wherein the refrigeration circuit includes a condenser (2), an evaporator (4), an expansion device (3) and an oil bypass conduit (7d), the oil bypass conduit (7d) extending between the oil separator (5) and the accumulator (6) to allow oil to flow therethrough and bypass the condenser (2), expansion device (3) and evaporator (4).
- An air conditioning system according to claim 5 wherein a capillary tube (8a) is disposed in the oil bypass conduit (7d) to control the flow of oil from the oil separator (5) into the accumulator (6).
- An air conditioning system according claim 2, wherein the auxiliary compressor (1b) is selectively operated based on refrigeration load to compress refrigerant.
- An air conditioning system according to claim 7 wherein an end of the oil transfer conduit (7e) is installed to a side of the main compressor (1a) corresponding to a predetermined height of oil in the main compressor (1a).
- An air conditioning system according to claim 7 further comprising a capillary tube (8b) installed at an intermediate portion of the oil transfer conduit (7e) to control the flow of oil from the main compressor (1a) into the auxiliary compressor (1b).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020050002622A KR20060081937A (en) | 2005-01-11 | 2005-01-11 | Refrigerating system |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1686333A2 EP1686333A2 (en) | 2006-08-02 |
EP1686333A3 EP1686333A3 (en) | 2009-04-22 |
EP1686333B1 true EP1686333B1 (en) | 2012-05-23 |
Family
ID=36118311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05109697A Expired - Fee Related EP1686333B1 (en) | 2005-01-11 | 2005-10-18 | Air conditioner |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1686333B1 (en) |
KR (1) | KR20060081937A (en) |
CN (1) | CN100360877C (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101561208B (en) * | 2009-05-15 | 2010-12-08 | 宁波奥克斯电气有限公司 | Method for controlling oil return of air conditioners |
CN101871707A (en) * | 2010-06-29 | 2010-10-27 | 广东志高空调有限公司 | Oil return system of low-pressure cavity compressor air conditioner |
KR102073011B1 (en) | 2013-12-18 | 2020-03-02 | 삼성전자주식회사 | Oil detecting apparatus, compressor having the same and method for controlling compressor |
CN112303957B (en) * | 2020-10-15 | 2021-10-08 | 珠海格力电器股份有限公司 | Oil return control method for compressor |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60245960A (en) * | 1984-05-18 | 1985-12-05 | 三菱電機株式会社 | Refrigeration cycle of air conditioner |
JPS61143659A (en) * | 1984-12-18 | 1986-07-01 | 三菱電機株式会社 | Refrigeration cycle device |
US4741674A (en) * | 1986-11-24 | 1988-05-03 | American Standard Inc. | Manifold arrangement for isolating a non-operating compressor |
JPH08189732A (en) * | 1995-01-09 | 1996-07-23 | Mitsubishi Heavy Ind Ltd | Refrigeration cycle |
EP0838640A3 (en) * | 1996-10-28 | 1998-06-17 | Matsushita Refrigeration Company | Oil level equalizing system for plural compressors |
CN1205414C (en) * | 2001-12-18 | 2005-06-08 | 乐金电子(天津)电器有限公司 | Oil recovery device of closed type compressor liquid storage tank |
ATE431925T1 (en) * | 2002-03-29 | 2009-06-15 | Daikin Ind Ltd | COOLING DEVICE |
CN1250925C (en) * | 2002-10-16 | 2006-04-12 | 广东科龙电器股份有限公司 | Twin compressor room air conditioner and its control method |
CN2656675Y (en) * | 2003-11-03 | 2004-11-17 | 广东美的集团股份有限公司 | Control mechanism under condition of compressor parallel connection |
-
2005
- 2005-01-11 KR KR1020050002622A patent/KR20060081937A/en not_active Application Discontinuation
- 2005-10-18 EP EP05109697A patent/EP1686333B1/en not_active Expired - Fee Related
- 2005-10-20 CN CNB2005101164353A patent/CN100360877C/en not_active Expired - Fee Related
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CN100360877C (en) | 2008-01-09 |
EP1686333A3 (en) | 2009-04-22 |
EP1686333A2 (en) | 2006-08-02 |
KR20060081937A (en) | 2006-07-14 |
CN1804513A (en) | 2006-07-19 |
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