GB1381113A - Automatic control for electrode boilers - Google Patents

Automatic control for electrode boilers

Info

Publication number
GB1381113A
GB1381113A GB1128772A GB1128772A GB1381113A GB 1381113 A GB1381113 A GB 1381113A GB 1128772 A GB1128772 A GB 1128772A GB 1128772 A GB1128772 A GB 1128772A GB 1381113 A GB1381113 A GB 1381113A
Authority
GB
United Kingdom
Prior art keywords
transistor
triac
current
boiler
water
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
GB1128772A
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.)
Eaton Williams R H
Original Assignee
Eaton Williams R H
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 Eaton Williams R H filed Critical Eaton Williams R H
Priority to GB1128772A priority Critical patent/GB1381113A/en
Priority to CA142,351A priority patent/CA981357A/en
Priority to FR7217775A priority patent/FR2138075B1/fr
Priority to NL7206863A priority patent/NL166318C/en
Priority to DE2225398A priority patent/DE2225398C3/en
Priority to US3780261D priority patent/US3780261A/en
Priority to CH753172A priority patent/CH534328A/en
Publication of GB1381113A publication Critical patent/GB1381113A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/28Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/30Electrode boilers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/24Controlling water feed or water level; Automatic water feeding or water-level regulators with electric switches
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7287Liquid level responsive or maintaining systems
    • Y10T137/7306Electrical characteristic sensing

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Cookers (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

1381113 Automatic control of electrode boilers R H EATON-WILLIAMS 10 May 1972 [19 May f971 10 March 1972] 15886/71 and 11287/72 Heading G3R An electronic controller detects the current flowing in an electrode boiler, which depends on the water level, and operates feed and drain valves in a predetermined sequence at set current values. In the controller shown in Fig. 1, the electrode current is applied through a transformer to terminals 7, 8 connected by a variable resistor for setting the required levels. A control voltage is thus produced across resistor R3 and applied to inverting inputs of differential amplifiers in the form of integrated circuits IC1, IC2, IC3. Initially, with no electrode current flowing, all the amplifiers will produce negative outputs, so that a transistor Q1 is off, transistor Q2 is on, and triac GR1 is triggered to open a feed valve so that water flows into the boiler. At the same time, transistor Q3 is off, transistor Q4 is on, and a triac GR2 would be fired to open a drain valve, except that its gating circuit is shorted by a transistor Q7 turned on by transistor Q2, so that the drain valve is held closed. As the boiler fills, the electrode current increases to a point where the voltage across resistor R3 switches amplifier IC2 to turn off transistor Q4 and remove the firing signal for the triac GR2. Further current rise switches amplifier IC1, turning off transistor Q2 and triac GR1 and thus closing the feed valve. The water now boils, but the current may rise further due to increasing conductivity and expansion of the water. A rise of, say, 10% causes amplifier IC3 to turn on a transistor Q5 which triggers triac GR2 and opens the drain valve. Resistors R37, R45 ensure that amplifier IC3 returns to its initial state only when sufficient water has been drained to reduce the current to its previous normal level. As the water boils away, the electrode current and control voltage decrease until amplifier IC2 is switched and triac GR2 opens the drain valve again. The level to which the boiler is drained before a further filling cycle begins is determined by the setting of a resistor RV1 in the circuit of amplifier IC1. The feed, boil, drain cycle will then be repeated automatically. An additional electrode is located in the boiler so that it carries current only if the water reaches a maximum permissible level. Current is then applied to a Schmitt trigger circuit Q8, Q9 to turn on a triac GR3, actuating an alarm signal and switching on a transistor Q6 which shorts triac GR1 and thus prevents opening of the feed valve. A manual drain switch is connected to terminals 3, 4, 5 to allow complete emptying of the boiler for maintenance. In a second embodiment, Fig. 2 (not shown), an additional feed period is included in the cycle, thereby allowing extra water to be drained from the boiler and thus removing more impurities. The circuit includes Schmitt triggers and a multivibrator in place of the integrated circuits of the first embodiment. Reference has been directed by the Comptroller to Specification 1139911.
GB1128772A 1971-05-19 1972-03-10 Automatic control for electrode boilers Expired GB1381113A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB1128772A GB1381113A (en) 1971-05-19 1972-03-10 Automatic control for electrode boilers
CA142,351A CA981357A (en) 1971-05-19 1972-05-16 Automatic control for electrode boilers
FR7217775A FR2138075B1 (en) 1971-05-19 1972-05-18
NL7206863A NL166318C (en) 1971-05-19 1972-05-19 ELECTRONIC OPERATING SYSTEM FOR AN ELECTRODES STEAM BOILER.
DE2225398A DE2225398C3 (en) 1971-05-19 1972-05-19 Method of generating steam
US3780261D US3780261A (en) 1971-05-19 1972-05-19 Automatic control for electrode boilers
CH753172A CH534328A (en) 1971-05-19 1972-05-19 Electronic control device for a water evaporator with electrodes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1588671 1971-05-19
GB1128772A GB1381113A (en) 1971-05-19 1972-03-10 Automatic control for electrode boilers

Publications (1)

Publication Number Publication Date
GB1381113A true GB1381113A (en) 1975-01-22

Family

ID=26248185

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1128772A Expired GB1381113A (en) 1971-05-19 1972-03-10 Automatic control for electrode boilers

Country Status (7)

Country Link
US (1) US3780261A (en)
CA (1) CA981357A (en)
CH (1) CH534328A (en)
DE (1) DE2225398C3 (en)
FR (1) FR2138075B1 (en)
GB (1) GB1381113A (en)
NL (1) NL166318C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478786A1 (en) * 1980-03-24 1981-09-25 Eaton Williams Raymond MULTI-ELECTRODE BOILER
WO1987003275A1 (en) * 1985-11-21 1987-06-04 Nautical Services Pty. Ltd. Electronic control and dosing system for desalinators

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1418994A (en) * 1973-02-16 1975-12-24 Easton Williams R H Electrode boiler with automatic control
CH563000A5 (en) * 1973-03-09 1975-06-13 Plascon Ag
US4084547A (en) * 1976-03-24 1978-04-18 Honeywell Inc. Safe start checking liquid processing system
US4070992A (en) * 1976-04-23 1978-01-31 Chemed Corporation Boiler blow down controller
US4146775A (en) * 1976-09-16 1979-03-27 Armstrong Machine Works Automatic control system for an electrode-type air humidifier
US4347430A (en) * 1980-02-14 1982-08-31 Michael Howard-Leicester Vapor generator with cycling monitoring of conductivity
US4308889A (en) * 1980-04-30 1982-01-05 Lin Jih Shyan Electric conductive type steam trap
US4491146A (en) * 1982-09-22 1985-01-01 Groen Division/Dover Corporation Liquid level control
GB2154896B (en) * 1984-03-02 1987-08-12 Atlas Air Australia Air humidifying apparatus
US4705936A (en) * 1985-01-17 1987-11-10 Masco Corporation Electronically controlled electric steam humidifier
GB9303582D0 (en) * 1993-02-23 1993-04-07 Eaton Williams Group Ltd Electrode boilsers with automatic control
US5932937A (en) * 1998-03-31 1999-08-03 Lancer Partnership, Ltd. Power control system
USPP12228P2 (en) 1999-06-01 2001-11-27 Florfis Ag Geranium plant named ‘Fislulu’
CA2807799A1 (en) * 2010-08-09 2012-02-16 Aldozkar D' Herrera Naranjo Device for heating liquid and generating steam
KR102552073B1 (en) * 2018-02-02 2023-07-06 현대자동차주식회사 Method for diagnosis level sensor fault of fuel battery watertrap and control device using the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2006631A (en) * 1931-04-09 1935-07-02 Eaton Milton Means for regulating electric steam generators
US3209125A (en) * 1962-11-01 1965-09-28 Keeney Mfg Company Humidifier
US3269364A (en) * 1964-03-03 1966-08-30 Bradley C Higgins Automatic adjustable electric control of mineral contents for blowdown in a boiler
US3446937A (en) * 1965-10-23 1969-05-27 Max Hugentobler Water heater for coffee machines
US3408941A (en) * 1967-04-13 1968-11-05 Kenneth G. Sorensen Tank filling control circuit
US3523175A (en) * 1968-05-27 1970-08-04 Ernest F Gygax Humidifier
US3605798A (en) * 1970-04-02 1971-09-20 Carl P Green Water level controls for steam tables and the like
US3671142A (en) * 1970-06-22 1972-06-20 Lumenite Electronic Co Liquid level control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478786A1 (en) * 1980-03-24 1981-09-25 Eaton Williams Raymond MULTI-ELECTRODE BOILER
WO1987003275A1 (en) * 1985-11-21 1987-06-04 Nautical Services Pty. Ltd. Electronic control and dosing system for desalinators
US4877489A (en) * 1985-11-21 1989-10-31 Nautical Services Pty. Ltd. Electronic control and dosing system for desalinators

Also Published As

Publication number Publication date
US3780261A (en) 1973-12-18
FR2138075A1 (en) 1972-12-29
DE2225398B2 (en) 1980-05-29
CA981357A (en) 1976-01-06
DE2225398C3 (en) 1981-02-12
NL166318C (en) 1981-07-15
NL7206863A (en) 1972-11-21
CH534328A (en) 1973-02-28
FR2138075B1 (en) 1973-07-13
DE2225398A1 (en) 1972-12-28

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PLE Entries relating assignments, transmissions, licences in the register of patents
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years