GB1389767A - Liquid level protection system for refrigeration compressor - Google Patents

Liquid level protection system for refrigeration compressor

Info

Publication number
GB1389767A
GB1389767A GB932073A GB932073A GB1389767A GB 1389767 A GB1389767 A GB 1389767A GB 932073 A GB932073 A GB 932073A GB 932073 A GB932073 A GB 932073A GB 1389767 A GB1389767 A GB 1389767A
Authority
GB
United Kingdom
Prior art keywords
liquid
thermistor
liquid level
temperature
scr
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
GB932073A
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.)
Borg Warner Corp
Original Assignee
Borg Warner 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 Borg Warner Corp filed Critical Borg Warner Corp
Publication of GB1389767A publication Critical patent/GB1389767A/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
    • 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
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
    • G01F23/247—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
    • 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
    • F25B2700/04—Refrigerant level

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressor (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

1389767 Liquid level alarm systems BORG-WARNER CORP 26 Feb 1973 [15 March 1972] 9320/73 Heading G1N An alarm circuit for detecting when a liquid in a container rises above a predetermined level comprises an NTC thermistor 21 Fig.2 in the container at the said level, connected in series with a resistor 25 across A. C. supply lines 18a, 18b, whereby the thermistor normally has a raised temperature and a low resistance, but when it is covered by the . liquid its temperature falls, its resistance rises and the voltage drop across it is sufficient to switch on a first SCR 34 followed by a second SCR 32 which short-circuits a relay winding 42 and opens switches 43, 44 to disconnect the supply to e.g. a compressor. In the embodiment described, the liquid is a mixture of oil and a refrigerant which boils when it covers the thermistor, thereby reducing its temperature very rapidly.
GB932073A 1972-03-15 1973-02-26 Liquid level protection system for refrigeration compressor Expired GB1389767A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23482272A 1972-03-15 1972-03-15

Publications (1)

Publication Number Publication Date
GB1389767A true GB1389767A (en) 1975-04-09

Family

ID=22882972

Family Applications (1)

Application Number Title Priority Date Filing Date
GB932073A Expired GB1389767A (en) 1972-03-15 1973-02-26 Liquid level protection system for refrigeration compressor

Country Status (8)

Country Link
US (1) US3744267A (en)
JP (1) JPS5330364B2 (en)
AU (1) AU471560B2 (en)
CA (1) CA972855A (en)
DE (1) DE2311821C3 (en)
FR (1) FR2176125B1 (en)
GB (1) GB1389767A (en)
IT (1) IT981377B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4220041A (en) 1977-04-07 1980-09-02 Potter Bronson M Alien liquid detector and control

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004431A (en) * 1975-05-22 1977-01-25 The Johnson Corporation Control for cooling unit
US4090371A (en) * 1975-11-24 1978-05-23 Technological Enterprises Corp. Monitor and control for refrigeration system
DE2639019C3 (en) * 1976-08-30 1981-09-03 Danfoss A/S, 6430 Nordborg Chiller
US4285207A (en) * 1978-07-31 1981-08-25 Diesel Kiki Company, Ltd. Air conditioning apparatus comprising refrigerant shortage sensor
JPH0539414Y2 (en) * 1985-02-25 1993-10-06
FR2618537B1 (en) * 1987-07-24 1989-09-15 Unite Hermetique Sa HERMETIC MOTOR COMPRESSOR WITH IMPROVED SECURITY
US5062277A (en) * 1990-10-29 1991-11-05 Carrier Corporation Combined oil heater and level sensor
JP2952839B2 (en) * 1991-08-29 1999-09-27 株式会社ゼクセル Startup control device for compressor
CA2154261A1 (en) * 1993-01-19 1994-08-04 Michael Nolan Conditioning sensing system for controlling working fluids
US5335513A (en) * 1993-01-19 1994-08-09 Parker-Hannifin Corporation Apparatus and method for detecting characteristics of a working fluid
WO1994017346A1 (en) * 1993-01-19 1994-08-04 Parker-Hannifin Corporation System for controlling flow of working fluids
US5289692A (en) * 1993-01-19 1994-03-01 Parker-Hannifin Corporation Apparatus and method for mass flow control of a working fluid
US5884494A (en) * 1997-09-05 1999-03-23 American Standard Inc. Oil flow protection scheme
US6091218A (en) * 1998-11-04 2000-07-18 Ritch; Harold D. Energy conservation circuit and method for use with multi-phase motors used to power a variable load
US6460354B2 (en) 2000-11-30 2002-10-08 Parker-Hannifin Corporation Method and apparatus for detecting low refrigerant charge
US20080000246A1 (en) * 2006-06-28 2008-01-03 Computime, Ltd. Conveying Temperature Information in a Controlled Variable Speed Heating, Ventilation, and Air Conditioning (HVAC) System
US7874724B2 (en) * 2007-04-11 2011-01-25 Trane International Inc. Method for sensing the liquid level in a compressor
US9181939B2 (en) 2012-11-16 2015-11-10 Emerson Climate Technologies, Inc. Compressor crankcase heating control systems and methods
US9341187B2 (en) 2013-08-30 2016-05-17 Emerson Climate Technologies, Inc. Compressor assembly with liquid sensor
US9353738B2 (en) 2013-09-19 2016-05-31 Emerson Climate Technologies, Inc. Compressor crankcase heating control systems and methods
JP6257801B2 (en) * 2014-11-04 2018-01-10 三菱電機株式会社 Refrigeration cycle apparatus and refrigeration cycle apparatus abnormality detection system
JP6305569B2 (en) * 2015-01-16 2018-04-04 三菱電機株式会社 Compressor
US10125768B2 (en) 2015-04-29 2018-11-13 Emerson Climate Technologies, Inc. Compressor having oil-level sensing system
CN114034140A (en) * 2021-11-29 2022-02-11 四川虹美智能科技有限公司 Defrosting method and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4220041A (en) 1977-04-07 1980-09-02 Potter Bronson M Alien liquid detector and control

Also Published As

Publication number Publication date
FR2176125A1 (en) 1973-10-26
JPS48102307A (en) 1973-12-22
AU471560B2 (en) 1976-04-29
CA972855A (en) 1975-08-12
AU5272773A (en) 1974-08-29
DE2311821A1 (en) 1973-10-04
DE2311821B2 (en) 1979-01-11
US3744267A (en) 1973-07-10
FR2176125B1 (en) 1975-10-31
JPS5330364B2 (en) 1978-08-26
DE2311821C3 (en) 1979-09-13
IT981377B (en) 1974-10-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee