EP0046378A2 - Durch ein Druckmedium gesteuerte Zeitverzögerungsanordnung und Feuerbekämpfungseinrichtung mit einer derartigen Anordnung - Google Patents

Durch ein Druckmedium gesteuerte Zeitverzögerungsanordnung und Feuerbekämpfungseinrichtung mit einer derartigen Anordnung Download PDF

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Publication number
EP0046378A2
EP0046378A2 EP81303701A EP81303701A EP0046378A2 EP 0046378 A2 EP0046378 A2 EP 0046378A2 EP 81303701 A EP81303701 A EP 81303701A EP 81303701 A EP81303701 A EP 81303701A EP 0046378 A2 EP0046378 A2 EP 0046378A2
Authority
EP
European Patent Office
Prior art keywords
chamber
time delay
fire fighting
fluid pressure
disc
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.)
Ceased
Application number
EP81303701A
Other languages
English (en)
French (fr)
Other versions
EP0046378A3 (de
Inventor
Raymond Whitlock
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.)
Chubb Fire Ltd
Original Assignee
Chubb Fire Security Ltd
Chubb Fire 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 Chubb Fire Security Ltd, Chubb Fire Ltd filed Critical Chubb Fire Security Ltd
Publication of EP0046378A2 publication Critical patent/EP0046378A2/de
Publication of EP0046378A3 publication Critical patent/EP0046378A3/de
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment

Definitions

  • the present invention relates to fluid pressure controlled time delay apparatus and is particularly, though not exclusively, concerned with time delay apparatus for use in connection with fire fighting systems of the type frequently installed e.g. in commercial and industrial premises for releasing a fluid fire extinguishing/prevention medium, such as carbon dioxide vapour, into the environment in the event or threatened event of fire.
  • a fluid fire extinguishing/prevention medium such as carbon dioxide vapour
  • a device which introduces a predetermined time delay between the initiation of a fluid-releasing sequence and the actual discharge of the medium into the environment. This is in order to permit personnel to evacuate before there is any risk of the environment being rendered irrespirable or otherwise harmful by the medium itself. It is furthermore advisable to delay the discharge of the medium until sufficient time has elapsed for fire doors to be closed, ventilators to be shut down etc, in order to maximise the effects of the medium when discharged.
  • the typical time delays provided by these devices range from a few seconds to about a minute.
  • Such devices typically comprise a chamber of predetermined volume into which the pressurised fluid is metered through a restricted flowpath provided eg by an orifice or capillary tube.
  • the pressure within the chamber is applied to one side of a piston exposed on its other side to a reference pressure, and the piston controls a valve which, when opened, connects the primary pressure source directly to some pressure-responsive means for releasing the fire fighting medium.
  • Initiation of the release sequence is accomplished by establishing communication between the pressure source and the chamber, but actual discharge of the fire fighting medium does not occur until the pressure in the chamber has risen to a value sufficient to move the piston and open the associated valve, and with a given source pressure the time taken to reach any selected pressure in the chamber depends upon the capacity of the chamber and the characteristics of the restricted flowpath by which it is connected to the pressure- source.
  • Time delay devices as described above are relatively complex and the parts of the piston/valve assembly need to be made to close tolerances; hence they are expensive to produce.
  • the present invention seeks to provide fluid pressure controlled time delay apparatus suitable for the same service as described above but being significantly simplified in its construction and operation, and hence amenable to more economical production.
  • the invention accordingly resides in time delay apparatus comprising a chamber of predetermined volume; a restricted flowpath for communicating a source of pressurised fluid with said chamber; and an outlet from the chamber normally closed by a bursting disc.
  • a “bursting disc” is meant an element which. is adapted to rupture to open the said outlet to the transmission of fluid pressure from the chamber when a predetermined pressure differential across the element is established.
  • the time taken to establish a selected burst pressure differential will depend upon the source pressure, the capacity of the chamber and the characteristics of the restricted flowpath., as in the case of the prior art devices referred to above.
  • the resultant surge of pressure from the chamber can be used directly through suitable pressure-responsive means to release a fire fighting medium or perform other functions in other applications of the device, so that the need for a p iston/valve assembly in the delay apparatus can be eliminated.
  • the invention in a second aspect resides in a time delay system comprising a source of pressurised fluid; a chamber of predetermined volume; a restricted flowpath for communicating said source of pressurised fluid with said chamber; an outlet from the chamber normally closed by a bursting disc; first means operable to establish communication between said source and chamber through said flowpath; and second means for performing a function in response to the transmission of fluid pressure from said chamber upon rupture of said bursting disc.
  • Such a system will involve a time delay between the operation of the first means and the response of the second means determined by the time taken for the pressure within the chamber to rise to a value which causes rupture of the bursting disc, as previously described.
  • the operation of the first means - which may comprise e.g. a valve or piercer mechanism associated with the pressure source - may be effected automatically or manually in response to the automatic detection of a fire or otherwise upon the raising of alarm
  • the second means comprising a mechanism operable to release the fire fighting medium upon the transmission of fluid pressure from.the aforesaid chamber.
  • apparatus and systems according to the invention are of general utility in the provision of selected time delays between a first event and a second event conditional upon the first, and are not restricted to the field of fire fighting.
  • the installation comprises a source of fluid fire fighting medium illustrated as a bank of cylinders 1 of compressed C0 2 , each of which is communicable through an individual knuckle valve 2 with a manifold 3 by which the gas is distributed to the areas to be protected in the event or threat of fire.
  • Operation of the valves 2 to release the stored gas can be effected by a pneumatic relay 4 having a piston 5 which, when pressure is transmitted to the cylinder of the relay, moves to withdraw a connecting cable 7 to which the valves 2 ' are all linked.
  • the power for operating the relay 4 is derived from a cylinder 8 of .compressed inert gas, such as nitrogen.
  • a cylinder 8 of .compressed inert gas such as nitrogen.
  • the cylinder 8 is opened to supply gas to a delay device 9 interposed in the line 10/11 between the cylinder 8 and relay 4, in the illustrated embodiment the outlet from the cylinder 8 being equipped with a frangible closure 12 which can be pierced by a pin 13 connected to a hand lever 14 to place the cylinder in communication with the delay device.
  • the delay device 9 which is more clearly shown in Figure 2, comprises a pressure vessel 15 having an inlet fitting which includes a restricted orifice 16 and an inlet adaptor 10A for connection to the line lO.
  • the vessel 15 is also equipped with an outlet fitting which includes a bursting disc 17 and an outlet adaptor 11A for connection to the line 11.
  • nitrogen gas passes through the line 10, adaptor 10A and orifice 16 into the chamber defined within the vessel 15, but is initially prevented from reaching the relay 4 by the bursting,disc 17.
  • the time delay introduced by the device 9 between operation of the lever 14 and the release of the fire fighting medium depends upon the capacity of the vessel 15, the size of the orifice 16 and the burst pressure of the disc 17. Variation of the delay can be achieved by changing the effective capacity of the vessel 15 or the size of the orifice 16, but most simply and effectively can be achieved by substituting discs 17 with different burst pressures.
  • the discs are typically made from nickel-silver or copper, discs of this type being commercially available and reliably adapted to rupture at pressures within closely prescribed limits.
  • a disc 17 with a burst pressure of 600 psi (41 bar) gives a delay of 7 seconds while a disc with a burst pressure of 700 psi (48 bar) gives a delay of 21 seconds.
  • the disc 17 is clamped peripherally between a pair of washers 18 which in turn are clamped between a cone ring 19 and a seating ring 20 provided on the vessel 15, the assembly being secured by a locking ring 21 screwed onto the ring 20 and retaining the ring 19.
  • the locking ring 21 is simply unscrewed to permit the rings and washers to be separated.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Safety Valves (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
EP81303701A 1980-08-20 1981-08-14 Durch ein Druckmedium gesteuerte Zeitverzögerungsanordnung und Feuerbekämpfungseinrichtung mit einer derartigen Anordnung Ceased EP0046378A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8027069 1980-08-20
GB8027069 1980-08-20

Publications (2)

Publication Number Publication Date
EP0046378A2 true EP0046378A2 (de) 1982-02-24
EP0046378A3 EP0046378A3 (de) 1982-05-05

Family

ID=10515557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303701A Ceased EP0046378A3 (de) 1980-08-20 1981-08-14 Durch ein Druckmedium gesteuerte Zeitverzögerungsanordnung und Feuerbekämpfungseinrichtung mit einer derartigen Anordnung

Country Status (4)

Country Link
EP (1) EP0046378A3 (de)
AU (1) AU541137B2 (de)
GB (1) GB2083353B (de)
NZ (1) NZ198079A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646783A1 (fr) * 1989-05-11 1990-11-16 Total Feuerschutz Gmbh Procede de mise en action d'une installation d'extinction des incendies
EP1344553A1 (de) * 2002-03-16 2003-09-17 TOTAL WALTHER GmbH, Feuerschutz und Sicherheit Auslösevorrichtung für ein Schnellöffnungsventil einer Feuerlöschanlage
US7032681B1 (en) 1999-10-07 2006-04-25 Fogtec Brandschutz Gmbh & Co. Kg Device for extinguishing a fire

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224184C2 (de) * 1992-07-22 1994-05-05 Deugra Ges Fuer Brandschutzsys Löschmittelbehälter

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2183208A (en) * 1936-12-28 1939-12-12 C O Two Fire Equipment Co Safety sealing means for fire extinguishing systems
US2393985A (en) * 1942-10-20 1946-02-05 Specialties Dev Corp Delayed-action release device
US2537009A (en) * 1947-06-07 1951-01-09 C O Two Fire Equipment Co Delayed action fire-extinguishing system
US2663153A (en) * 1949-03-10 1953-12-22 Specialties Dev Corp Fluid medium operated time delay apparatus
US2819865A (en) * 1954-08-11 1958-01-14 Specialties Dev Corp Fluid pressure controlled time delay apparatus
US2865592A (en) * 1954-07-02 1958-12-23 Specialties Dev Corp Delayed action valve controlling apparatus
US2878879A (en) * 1957-04-16 1959-03-24 Chemetron Corp Mechanical timer control for fire extinguishing system
US3052304A (en) * 1959-04-29 1962-09-04 Chemetron Corp Fire extinguishing system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2183208A (en) * 1936-12-28 1939-12-12 C O Two Fire Equipment Co Safety sealing means for fire extinguishing systems
US2393985A (en) * 1942-10-20 1946-02-05 Specialties Dev Corp Delayed-action release device
US2537009A (en) * 1947-06-07 1951-01-09 C O Two Fire Equipment Co Delayed action fire-extinguishing system
US2663153A (en) * 1949-03-10 1953-12-22 Specialties Dev Corp Fluid medium operated time delay apparatus
US2865592A (en) * 1954-07-02 1958-12-23 Specialties Dev Corp Delayed action valve controlling apparatus
US2819865A (en) * 1954-08-11 1958-01-14 Specialties Dev Corp Fluid pressure controlled time delay apparatus
US2878879A (en) * 1957-04-16 1959-03-24 Chemetron Corp Mechanical timer control for fire extinguishing system
US3052304A (en) * 1959-04-29 1962-09-04 Chemetron Corp Fire extinguishing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646783A1 (fr) * 1989-05-11 1990-11-16 Total Feuerschutz Gmbh Procede de mise en action d'une installation d'extinction des incendies
US7032681B1 (en) 1999-10-07 2006-04-25 Fogtec Brandschutz Gmbh & Co. Kg Device for extinguishing a fire
EP1344553A1 (de) * 2002-03-16 2003-09-17 TOTAL WALTHER GmbH, Feuerschutz und Sicherheit Auslösevorrichtung für ein Schnellöffnungsventil einer Feuerlöschanlage

Also Published As

Publication number Publication date
EP0046378A3 (de) 1982-05-05
AU7433481A (en) 1982-02-25
NZ198079A (en) 1984-12-14
GB2083353B (en) 1984-02-01
AU541137B2 (en) 1984-12-20
GB2083353A (en) 1982-03-24

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Inventor name: WHITLOCK, RAYMOND