GB1328628A - Refrigeration system with multiple centrifugal compressors and load balancing control - Google Patents

Refrigeration system with multiple centrifugal compressors and load balancing control

Info

Publication number
GB1328628A
GB1328628A GB4047771A GB4047771A GB1328628A GB 1328628 A GB1328628 A GB 1328628A GB 4047771 A GB4047771 A GB 4047771A GB 4047771 A GB4047771 A GB 4047771A GB 1328628 A GB1328628 A GB 1328628A
Authority
GB
United Kingdom
Prior art keywords
motor
motors
compressor
compressors
current
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
Application number
GB4047771A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1328628A publication Critical patent/GB1328628A/en
Expired legal-status Critical Current

Links

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
    • 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
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0269—Surge control by changing flow path between different stages or between a plurality of compressors; load distribution between compressors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

1328628 Automatic control of current and temperature WESTINGHOUSE ELECTRIC CORP 31 Aug 1971 [28 Sept 1970] 40477/71 Heading G3R [Also in Divisions F1, F4] A refrigeration system includes parallel compressors driven by electric motors. The currents drawn by each motor are compared and the capacity of a compressor is automatically reduced if the current in its associated motor exceeds the currents in other motors, so that the loads on the compressors are balanced. In the system shown, a refrigeration circuit includes two parallel compressors 1, 3 driven by motors 2, 4 respectively, a condensor 7, an expansion valve 8 and an evaporator chiller 9. Sensors 19, 23 detect the temperature of zooled water 10, and elements 20, 24 operate appropriate contacts 21, 22, 25, 26 if the temperature is above or below a desired value, to energise solenoids 27-30. These solenoids operate valves which control pressure fluid-flow to piston and cylinder arrangements for opening or closing vanes on the compressors 1, 3 and thus adjusting the flow in the refrigerant circuit, Figs.2-5 (not shown), to regulate the water temperature. Each compressor motor 2, 4 has a currentsensing coil 70, 71 connected to an associated relay 72, 73 which, when the motor current exceeds a preset value, closes contacts 72', 73' to energise one of the solenoids 27, 28 and decrease the load on the motor concerned. The coils 70, 71 are connected together in a bridge arrangement 75, 76, 77 so that the sensed currents flow in opposition and an excessive current difference operates the relay 72, 73 associated with the motor drawing the higher current. The load on that motor is reduced as described above and the compressor loads are balanced. Similar comparator connections for three parallel compressor motors are described, Fig. 6 (not shown). If a motor is switched off, an associated contact 80, 81 closes to short out the currentsensing coil 70, 71, allowing the remaining motors to function in the same way as before.
GB4047771A 1970-09-28 1971-08-31 Refrigeration system with multiple centrifugal compressors and load balancing control Expired GB1328628A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7591470A 1970-09-28 1970-09-28

Publications (1)

Publication Number Publication Date
GB1328628A true GB1328628A (en) 1973-08-30

Family

ID=22128726

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4047771A Expired GB1328628A (en) 1970-09-28 1971-08-31 Refrigeration system with multiple centrifugal compressors and load balancing control

Country Status (8)

Country Link
US (1) US3648479A (en)
AU (1) AU465521B2 (en)
CA (1) CA923212A (en)
DE (1) DE2147394C2 (en)
ES (1) ES395343A1 (en)
FR (1) FR2108039B1 (en)
GB (1) GB1328628A (en)
IT (1) IT938839B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121994A (en) * 1982-05-04 1984-01-04 Tokyo Shibaura Electric Co Control of air conditioning apparatus
GB2255208A (en) * 1991-04-26 1992-10-28 Toshiba Kk Current control apparatus for air-conditioning system
CN100582608C (en) * 2002-05-27 2010-01-20 Lg电子株式会社 Preventer for overload of air conditioner and its method

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4205537A (en) * 1978-12-11 1980-06-03 General Electric Company Multiple hermetic-motor compressor in common shell
GB2159980B (en) * 1982-09-10 1987-10-07 Frick Co Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current
US4494006A (en) * 1982-09-15 1985-01-15 Compressor Controls Corporation Method and apparatus for controlling a multicompressor station
US4560319A (en) * 1983-08-01 1985-12-24 MAN Maschinenfabrik Unternehmensbereich GHH Sterkrade Method and apparatus for controlling at least two parallel-connected turbocompressors
US4494382A (en) * 1983-10-11 1985-01-22 Carrier Corporation Method and apparatus for controlling when to initiate an increase in compressor capacity
US4614090A (en) * 1985-01-31 1986-09-30 Yanmar Diesel Engine Co. Ltd. Outdoor unit of an air conditioner of an engine heat pump type
DE3937152A1 (en) * 1989-11-08 1991-05-16 Gutehoffnungshuette Man METHOD FOR OPTIMIZING OPERATION OF TWO OR SEVERAL COMPRESSORS IN PARALLEL OR SERIES
US5195329A (en) * 1991-11-12 1993-03-23 Carrier Corporation Automatic chiller plant balancing
US5894739A (en) * 1997-07-10 1999-04-20 York International Corporation Compound refrigeration system for water chilling and thermal storage
US6602057B2 (en) 2001-10-01 2003-08-05 Dresser-Rand Company Management and optimization of load sharing between multiple compressor trains for controlling a main process gas variable
CN100429407C (en) * 2002-08-06 2008-10-29 约克国际公司 Stability control system and method for centrifugal compressors operating in parallel
EP2215365B1 (en) * 2007-10-31 2017-01-18 Johnson Controls Technology Company Control system
WO2015190525A1 (en) * 2014-06-10 2015-12-17 東芝キヤリア株式会社 Heat source machine and heat source device
CN112577211B (en) * 2019-09-30 2021-12-14 约克（无锡）空调冷冻设备有限公司 Load balancing method for two compressors

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2336671A (en) * 1933-11-29 1943-12-14 Gen Motors Corp Refrigerating apparatus
US2178100A (en) * 1937-05-13 1939-10-31 Curtis Refrigerating Machine C Refrigerating condensing unit
DE972394C (en) * 1954-01-09 1959-07-16 Siemens Ag Device for torque control of double drives, especially for double drives of rolling stands
DE1117710B (en) * 1954-05-24 1961-11-23 Siemens Ag Load balancing control of multi-motor drives with shunt motors
US3350897A (en) * 1966-01-11 1967-11-07 Westinghouse Electric Corp Controls for centrifugal compressors having spin vanes in their inlets
US3362185A (en) * 1966-06-20 1968-01-09 Westinghouse Electric Corp Refrigeration systems with centrifugal compressors and air cooled condensers
US3609989A (en) * 1970-04-15 1971-10-05 Westinghouse Electric Corp Control for refrigeration system centrifugal compressor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121994A (en) * 1982-05-04 1984-01-04 Tokyo Shibaura Electric Co Control of air conditioning apparatus
GB2255208A (en) * 1991-04-26 1992-10-28 Toshiba Kk Current control apparatus for air-conditioning system
US5207071A (en) * 1991-04-26 1993-05-04 Kabushiki Kaisha Toshiba Current control apparatus for air-conditioning system
GB2255208B (en) * 1991-04-26 1994-09-28 Toshiba Kk Current control apparatus for air-conditioning system
CN100582608C (en) * 2002-05-27 2010-01-20 Lg电子株式会社 Preventer for overload of air conditioner and its method

Also Published As

Publication number Publication date
AU3289371A (en) 1973-03-08
DE2147394A1 (en) 1972-03-30
FR2108039A1 (en) 1972-05-12
FR2108039B1 (en) 1977-01-21
AU465521B2 (en) 1975-10-02
IT938839B (en) 1973-02-10
CA923212A (en) 1973-03-20
US3648479A (en) 1972-03-14
DE2147394C2 (en) 1984-04-05
ES395343A1 (en) 1974-12-16

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee