US3680325A - On-off controlled oil temperature adjusting apparatus with a protective device - Google Patents

On-off controlled oil temperature adjusting apparatus with a protective device Download PDF

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Publication number
US3680325A
US3680325A US95020A US3680325DA US3680325A US 3680325 A US3680325 A US 3680325A US 95020 A US95020 A US 95020A US 3680325D A US3680325D A US 3680325DA US 3680325 A US3680325 A US 3680325A
Authority
US
United States
Prior art keywords
relay
circuit
series
heat sensitive
break contact
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 - Lifetime
Application number
US95020A
Other languages
English (en)
Inventor
Junji Chigira
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.)
Marelli Corp
Original Assignee
Kanto Seiki Co Ltd
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 Kanto Seiki Co Ltd filed Critical Kanto Seiki Co Ltd
Application granted granted Critical
Publication of US3680325A publication Critical patent/US3680325A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • 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
    • F25B49/025—Motor control arrangements
    • 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
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • 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
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • 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
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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
    • F25B2600/00—Control issues
    • F25B2600/23—Time delays
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator

Definitions

  • a second relay with a break contact is inserted in the circuit of said first relay, a series circuit consisting of the break contact of said first relay and a capacitor, a make contact of said first relay connected in parallel with said capacitor, and a make contact of said first relay inserted in a main relay circuit for breaking the power source to the motor for driving a compressor.
  • Said series circuit is inserted in the base circuit of a transistor of the circuit of said second relay.
  • This invention relates to an on-off controlled oil temperature adjusting apparatus with a protective device.
  • the switch in the motor power supply circuit must be turned only after a predetermined safety time has elapsed from the instant when the switch is turned off.
  • An object of the present invention is to provide a protective device for preventing the flow of a heavy starting current through the motor circuit in an on-off controlled oil temperature adjusting apparatus until the pressures of both the high pressure and low pressure sides of the Freon gas compressor are balanced.
  • the power source is not connected to the motor until a predetermined time has elapsed and both pressures are balanced.
  • FIG. 1 is a schematic view of an on-off controlled oil temperature adjustin g apparatus according to this invention.
  • a bridge circuit consisting of a heat sensitive portion or thermistor l, a standard heat sensitive portion or thermistor 2 and resistors 12 and 13 is connected to a direct current power source B.
  • a relay 4 is connected to a break contact 5 associated with a relay 3.
  • a series circuit consisting of a break contact 6 of the relay 4 and a capacitor 8 ,is inserted in the base circuit of a transistor 14 the relay being connected in series with the collector of transistor 14.
  • a make contact 7 of the relay 4 is connected in parallel with the capacitor 8 and.
  • a make contact 9 of the relay 4 is inserted in a circuit of a main relay for breaking and making the power source to a motor 10 for driving a compressor 11.
  • the heat sensitive portion 1 is positioned in the oil for a machine tool 23 and said is located standard heat sensibecause the oil is cooled to a predetermined temperature by a refrigerating machine, the output voltage of the bridge circuit comprising the heat sensitive portions 1 and 2 and resistors 12 and 13 becomes lower than a predetermined value.
  • the current flowing through the relay 4 decreases, contact 6 is closed and contacts 7 and 9 are opened by the deenergization of relay 4.
  • the current flowing through the motor 10 is broken by the deenergization of the main relay 15, so that operation of the refrigerating machine is stopped.
  • the relay 3 is energized from the instant that the contact 6 is closed until capacitor 8 is fully charged and therefore contact 5 remains open.
  • relay 4 is not energized and the compressor 11 is not driven even if the output voltage of the bridge circuit comprising the heat sensitive portions 1 and 2 and resistors 12 and 13 reaches a value which would operate relay 4.
  • the relay 4 is energized when capacitor 8 is fully charged and the compressor 1 l is driven.
  • the capacity of the capacitor 8 be of such value that the duration of time required for charging the capacitor 8 is equal to or over the time necessary to balance the pressures of both the high pressure and low pressure sides of the compressor.
  • the power source is not applied to the motor until the time necessary to charge the capacitor has elapsed, even if the heat sensitive circuit is operated because the oil temperature is elevated and the temperature difference between the oil and the room exceeds a predetermined value Y after the motor was stopped because the difference between the oil temperature and standard temperature became less than the predetermined value X.
  • the power source is not connected to the motor prior to the time when the pressures of the high pressure and low pressure sides of both the Freon gas compressor are balanced.
  • An on-off controlled oil temperature adjusting apparatus with a protective device comprising a. a bridge circuit including a heat sensitive portion (1) for positioning in the oil of a machine tool and a standard heat sensitive portion (2);
  • a capacitor (8) connected in series with the break contact (6) of said first relay (4) between the base of said transistor (14) and said coupling means, the first make contact (7) of said relay 4) being connected in parallel with said capacitor (8).
  • said motor being coupled to a power source by the second make contact (9) of said first relay (4).

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Air Conditioning Control Device (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Control Of Temperature (AREA)
US95020A 1969-12-16 1970-12-04 On-off controlled oil temperature adjusting apparatus with a protective device Expired - Lifetime US3680325A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1969119808U JPS4731241Y1 (enrdf_load_stackoverflow) 1969-12-16 1969-12-16

Publications (1)

Publication Number Publication Date
US3680325A true US3680325A (en) 1972-08-01

Family

ID=14770724

Family Applications (1)

Application Number Title Priority Date Filing Date
US95020A Expired - Lifetime US3680325A (en) 1969-12-16 1970-12-04 On-off controlled oil temperature adjusting apparatus with a protective device

Country Status (4)

Country Link
US (1) US3680325A (enrdf_load_stackoverflow)
JP (1) JPS4731241Y1 (enrdf_load_stackoverflow)
DE (1) DE2061642C3 (enrdf_load_stackoverflow)
GB (1) GB1331069A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102072141A (zh) * 2011-02-23 2011-05-25 无锡和晶科技股份有限公司 一种可防止失控的冰箱压缩机控制电路
US20110154835A1 (en) * 2009-12-25 2011-06-30 Satoshi Miyamoto Machine tool cooling system and cooling method
WO2013037417A1 (de) * 2011-09-16 2013-03-21 Siemens Aktiengesellschaft Vorrichtung und verfahren zum schutz eines verbrauchers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2262691C3 (de) * 1972-12-21 1982-02-11 Vdo Adolf Schindling Ag, 6000 Frankfurt Elektronischer Temperaturschalter
FR2283570A1 (fr) * 1974-09-02 1976-03-26 Unelec Dispositif de protection thermique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595028A (en) * 1969-10-02 1971-07-27 Gen Electric Control means for air-conditioning system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595028A (en) * 1969-10-02 1971-07-27 Gen Electric Control means for air-conditioning system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110154835A1 (en) * 2009-12-25 2011-06-30 Satoshi Miyamoto Machine tool cooling system and cooling method
CN102072141A (zh) * 2011-02-23 2011-05-25 无锡和晶科技股份有限公司 一种可防止失控的冰箱压缩机控制电路
WO2013037417A1 (de) * 2011-09-16 2013-03-21 Siemens Aktiengesellschaft Vorrichtung und verfahren zum schutz eines verbrauchers
CN103797675A (zh) * 2011-09-16 2014-05-14 西门子公司 用于保护用电器的装置和方法
KR101460952B1 (ko) 2011-09-16 2014-11-13 지멘스 악티엔게젤샤프트 부하를 보호하기 위한 장치 및 방법
US9325165B2 (en) 2011-09-16 2016-04-26 Siemens Aktiengesellschaft Device and method for protecting a consumer
CN103797675B (zh) * 2011-09-16 2016-11-09 西门子公司 用于保护用电器的装置和方法

Also Published As

Publication number Publication date
JPS4731241Y1 (enrdf_load_stackoverflow) 1972-09-19
DE2061642C3 (enrdf_load_stackoverflow) 1974-04-11
GB1331069A (en) 1973-09-19
DE2061642A1 (enrdf_load_stackoverflow) 1971-07-08
DE2061642B2 (enrdf_load_stackoverflow) 1973-09-20

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