US3868963A - Apparatus for monitoring the filling factor of containers for compressed gas - Google Patents

Apparatus for monitoring the filling factor of containers for compressed gas Download PDF

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Publication number
US3868963A
US3868963A US359424A US35942473A US3868963A US 3868963 A US3868963 A US 3868963A US 359424 A US359424 A US 359424A US 35942473 A US35942473 A US 35942473A US 3868963 A US3868963 A US 3868963A
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United States
Prior art keywords
gas
storage container
state
gas supply
container
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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
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US359424A
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English (en)
Inventor
Reiner Muellerpoths
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
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BBC Brown Boveri France SA
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Publication of US3868963A publication Critical patent/US3868963A/en
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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • 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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/6416—With heating or cooling of the system
    • Y10T137/6579—Circulating fluid in heat exchange relationship
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7761—Electrically actuated valve

Definitions

  • the present invention relates to a device for monitor-.
  • gas containers especially storage containers for SP for use in electrical switch devices insulated with this gas and for regulating the inflow of SF, gas from an adjoining heated SF gas cylinder with a pressure gauge for monitoring the pressure in the storage cylinder.
  • SF has the property of liquefying at a given pressure and at a temperature such as can occur in particular in open air installations.
  • the problem consists in the fact that the further quantity of SF fed in liquefies because of the low temperature, so that one cannot measure SF sufficient rise in pressure.
  • the storage container can be completely filled with liquid SFG.
  • the operator reads from the H graph for SF gas the maximum pressure which occurs at a given temperature and at which no liquefaction as yet takes place.
  • the storage container should be surrounded by a heating winding and that the Sf should be maintained at an adequately high temperature.
  • a heating winding is troublesome and expensive.
  • the problem underlying the invention is that of providing a device of the type mentioned above, in which a heating winding is no longer required and which auto matically controls a solenoid valve for topping up with SF depending both on the pressure in the storage vessel and also on the liquid level. It is particularly desirable, if the ambient temperature is very low, to avoid a further unnecessary topping up which can lead to even more liquid SF.
  • a measuring unit is provided at the lowest position in the storage container which responds to the change in the physical condition, and which acts on the adjusting member in the sense of a superimposition of the pressure gauge.
  • the measuring member is advantageously a hot conductor which is provided in one branch of a bridge circuit.
  • the measuring member used is a plate condenser which is provided in one branch of a capacitance measuring bridge.
  • a circuit arrangement with a hot conductor Or a condenser it is also possible to provide a known float which, when a given quantity of liquid or a given level Eof liquid is reached in the container, actuates a contact whose output signal can be Switched to an AND member for linking with the measuring impulses of the pressure gauge.
  • the advantage of the device according to the invention consists in the fact that on the one hand a heating device no longer has to be provided, and that furthermore additional measurements, especially the determination of the critical pressure and of the critical temperature or of the liquefaction pressure and the liquefaction temperature no longer have to be carried out separately.
  • FIG. 1 is a diagrammatic view of the improved SF, supply system
  • FIG. 2 is a detail showing the hot conductor inserted in a blind hole of the SP container.
  • FIG. 3 illustrates a modification of the circuit shown in FIG. 1 wherein a capacitance bridge is utilized in lieu of a resistance bridge.
  • a storage vessel 1 for a switching installation insulated with SF not illustrated receives the SF gas during normal operation through a pipe 2 coming from a compressor 3, which draws switch-arc contaminated SF via pipe 24 from the low-pressure space 23 of a switching installation not represented in greater detail and pumps it into the container 1.
  • the contaminated SP gas is purified by a filter 4.
  • a further heated container 5 which is installed as a storage cylinder.
  • This container 5 is connected via a pipe 6 with the storage container 1; in addition there is provided a solenoid valve 7 which opens up the pipe 6 from the container 5 to the container 1 in the event ofa leakage loss. From container 1, the re-compressed and filtered gas is led back via pipe 25 to the high-pressure space 28 of the switching installation.
  • This bridge circuit 9 includes four resistances, one of which, resistance 10, the one located on the container, is designed as a hot conductor, whilst the other three, ll, l2, 13, are normal resistances.
  • resistance 10 the one located on the container
  • ll, l2, 13 are normal resistances.
  • One diagonal of this bridge is fed by means of a source of alternating voltage 14, whilst the drop in potential on the other diagonal, that is to say at the junction of resistances 10, 11 and resistances 12, 13, is fed to an amplifier unit 15, the output of which energizes the actuating magnet 16 of a relay 17.
  • Relay 17 and another relay 19 together form an AND member, the output Signal of which controls the solenoid valve 7. That is to say, solenoid valve 7 is energized and opened to connect the storage cylinder 5 with container 1 only when both relays 17 and 19 are actuated.
  • the contact pressure gauge 8 responds, and its output signal energizes via conductor 26 the actuating magnet 18 of a second relay 19 connected in series with relay 17 via conductor 33. if now at the same time there is a quantity of liquid inside the container, then the relay 17 attracts and opens. Thus while the relay contact 19 is indeed closed, relay 17 is open with the result that no current can flow through the contacts of these relays and through conductor 27 so as to energize and thereby open the solenoid valve 7.
  • a temperature-dependent resistance is provided as the hot conductor associated with container 1.
  • This temperature-dependent resistance changes its resistance when it is surrounded by liquid SF instead of SP gas. This is because the dissipation of heat in the case of gaseous SF it is therefore necessary to install the hot conductor at the lowest point in the storage container 1. which directly actuates the relay 17 via a contact. It is also feasible to provide inside the container a light path which utilizes the physical fact that the refractive index and the light transmissivity of SF gas and SP liquid are different thereby to sense the dif ference therebetween.
  • a temperature-dependent resistance 10 is provided,
  • FIG. 2 it is now possible, as shown in FIG. 2 to provide at the lowest point in the inner wall a blind hole 20 into which the hot conductor in inserted.
  • a-bore is made directly into the blind hole from the outside, the hot conductor rests in this bore and extends into the blind hole.
  • the leads are brought out through the aperture 21.
  • a threaded plug 22 is screwed in.
  • FIG. 3 illustrates the use of a capacitance bridge circuit 29 from which it will be seen that plate condenser 30 is located in the same position as hot conductor 10 in the FIG. 1 bridge circuit whereas condensers 31, 32, and 33 in the capacitance bridge correspond to resistors 11, 12 and 13 of the resistance bridge circuit of FIG. 1.
  • a gas supply plant particularly for use in supplying an insulating gaseous medium such as SF to a switching installation insulated with the gas comprising a storage container receiving the gas in a pressurized state from a compressorv drawing gas from the low pressure side of the switching installation and adapted to deliver the gas to the high pressure side of the switching installation, a heated ancillary pressurized gas container connected to said storage container by a pipe line including a control valve therein, a pressure gauge connected with said storage container for monitoring the gas pressure therein and which delivers a first control signal when the gas pressure falls to a predetermined level, a state measuring member located at the lowest part of said storage container and which is responsive to changes in the physical state of the medium therein from its gaseous state to its liquid state to produce a corresponding second control signal, and control means actuated by said first and second control signals acting conjointly to control the opening and closing operations of said control valve in said pipe line interconnecting said ancillary container to said storage container.
  • control valve is of the solenoid type and is connected to an energizing source through contacts of two relays arranged in series, said relays being controlled respectively by said first and second control signals.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
US359424A 1972-05-31 1973-05-11 Apparatus for monitoring the filling factor of containers for compressed gas Expired - Lifetime US3868963A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2226528A DE2226528A1 (de) 1972-05-31 1972-05-31 Einrichtung zur ueberwachung des fuellzustandes von druckgasbehaeltern

Publications (1)

Publication Number Publication Date
US3868963A true US3868963A (en) 1975-03-04

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US359424A Expired - Lifetime US3868963A (en) 1972-05-31 1973-05-11 Apparatus for monitoring the filling factor of containers for compressed gas

Country Status (10)

Country Link
US (1) US3868963A (it)
JP (1) JPS4944777A (it)
AT (1) AT339625B (it)
CH (1) CH552168A (it)
DE (1) DE2226528A1 (it)
FR (1) FR2186623B3 (it)
GB (1) GB1382569A (it)
IT (1) IT987992B (it)
NL (1) NL7307500A (it)
NO (1) NO136591C (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1248100A2 (en) * 2001-04-06 2002-10-09 The Boc Group, Inc. Method and system for liquefaction monitoring
CN102162747A (zh) * 2010-12-26 2011-08-24 河海大学常州校区 一种光电传感器信号处理电路
CN103644451A (zh) * 2013-11-16 2014-03-19 国网山东昌乐县供电公司 Sf6气体试验充装用多功能车
CN108181941A (zh) * 2018-01-03 2018-06-19 中国石油大学(华东) 一种长输天然气管道积液自动清除收集装置及控制方法
US20180358148A1 (en) * 2015-11-30 2018-12-13 General Electric Technology Gmbh Method and facility for filling a gas-insulated electrical apparatus comprising a mixture of (cf3)2cfcn and co2
CN110159916A (zh) * 2019-06-20 2019-08-23 广东医和科技有限公司 一种静音储气装置及自动充气方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145249B (en) * 1983-08-04 1987-05-28 Microflow Uk Limited Liquid supply line control circuitry
JPS6326497A (ja) * 1986-07-17 1988-02-04 Kachi Tekkosho:Kk ガス置換回収装置
DE3714672A1 (de) * 1987-05-02 1988-11-17 Telefunken Electronic Gmbh Rc-leitung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550886A (en) * 1947-02-12 1951-05-01 Union Carbide & Carbon Corp System for conserving liquefied gases
US2590061A (en) * 1949-09-01 1952-03-18 Gen Electric Industrial liquid cooler automatic liquid level control
US2928406A (en) * 1956-06-22 1960-03-15 Ind Instr Inc Solution conductivity measuring and controlling apparatus
US2986593A (en) * 1958-05-15 1961-05-30 Gen Electric Gas bubble prevention system for liquid insulated electrical apparatus
US3383881A (en) * 1966-10-28 1968-05-21 Phillips Petroleum Co Method of controlling composition by pressure
US3770020A (en) * 1971-05-13 1973-11-06 Tokyo Keiki Kk Interface detector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550886A (en) * 1947-02-12 1951-05-01 Union Carbide & Carbon Corp System for conserving liquefied gases
US2590061A (en) * 1949-09-01 1952-03-18 Gen Electric Industrial liquid cooler automatic liquid level control
US2928406A (en) * 1956-06-22 1960-03-15 Ind Instr Inc Solution conductivity measuring and controlling apparatus
US2986593A (en) * 1958-05-15 1961-05-30 Gen Electric Gas bubble prevention system for liquid insulated electrical apparatus
US3383881A (en) * 1966-10-28 1968-05-21 Phillips Petroleum Co Method of controlling composition by pressure
US3770020A (en) * 1971-05-13 1973-11-06 Tokyo Keiki Kk Interface detector

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1248100A2 (en) * 2001-04-06 2002-10-09 The Boc Group, Inc. Method and system for liquefaction monitoring
US20020144542A1 (en) * 2001-04-06 2002-10-10 Hartigan Gavin D. Method and system for liquefaction monitoring
EP1248100A3 (en) * 2001-04-06 2003-12-17 The Boc Group, Inc. Method and system for liquefaction monitoring
SG111052A1 (en) * 2001-04-06 2005-05-30 Boc Group Inc Method and system for liquefaction monitoring
US6915660B2 (en) 2001-04-06 2005-07-12 The Boc Group, Inc. Method and system for liquefaction monitoring
CN102162747A (zh) * 2010-12-26 2011-08-24 河海大学常州校区 一种光电传感器信号处理电路
CN103644451A (zh) * 2013-11-16 2014-03-19 国网山东昌乐县供电公司 Sf6气体试验充装用多功能车
US20180358148A1 (en) * 2015-11-30 2018-12-13 General Electric Technology Gmbh Method and facility for filling a gas-insulated electrical apparatus comprising a mixture of (cf3)2cfcn and co2
US10770198B2 (en) * 2015-11-30 2020-09-08 General Electric Technology Gmbh Method and facility for filling a gas-insulated electrical apparatus comprising a mixture of (CF3)2CFCN and CO2
CN108181941A (zh) * 2018-01-03 2018-06-19 中国石油大学(华东) 一种长输天然气管道积液自动清除收集装置及控制方法
CN110159916A (zh) * 2019-06-20 2019-08-23 广东医和科技有限公司 一种静音储气装置及自动充气方法
CN110159916B (zh) * 2019-06-20 2024-03-22 广东医和科技有限公司 一种静音储气装置及自动充气方法

Also Published As

Publication number Publication date
DE2226528A1 (de) 1973-12-06
ATA470973A (de) 1977-02-15
GB1382569A (en) 1975-02-05
NO136591B (it) 1977-06-20
FR2186623A1 (it) 1974-01-11
NL7307500A (it) 1973-12-04
CH552168A (de) 1974-07-31
AT339625B (de) 1977-10-25
JPS4944777A (it) 1974-04-27
NO136591C (no) 1977-09-28
FR2186623B3 (it) 1976-05-21
IT987992B (it) 1975-03-20

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