CA2184895C - Delivery of fire-extinguishing material by a pressure gas source - Google Patents
Delivery of fire-extinguishing material by a pressure gas source Download PDFInfo
- Publication number
- CA2184895C CA2184895C CA002184895A CA2184895A CA2184895C CA 2184895 C CA2184895 C CA 2184895C CA 002184895 A CA002184895 A CA 002184895A CA 2184895 A CA2184895 A CA 2184895A CA 2184895 C CA2184895 C CA 2184895C
- Authority
- CA
- Canada
- Prior art keywords
- liquid
- tube
- pressure gas
- outgoing
- hydraulic accumulator
- 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 - Fee Related
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- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention relates to a fire-fighting equipment, comprising a hydraulic accumulator (H) and a pressure gas source (T) connected thereto for driving liquid by means of pressure gas out of the hydraulic accumulator through an outgoing liquid tube (6) arranged in the accumulator. The object of the invention is to provide a novel equipment permitting an efficient liquid delivery from one hydraulic accumulator (H) or a plurality of hydraulic accumulators (H, H'), by mixing gas efficiently in the liquid immediately from the beginning. This is achieved in such a way that the outgoing liquid tube (6) comprises a throttling (11) and that to the liquid tube (6), after said throttling (11), is connected a throttled gas inlet (13) preferably from the same pressure gas source that is connected to the hydraulic accumulator (H) for driving liquid out of this accumulator.
Description
DELIVERY OF FIRE-EXTINGUISHING MATERIAL BY A PRESSURE GAS SOURCE
The present invention relates to a fire-fight-ing equipment, comprising a hydraulic accumulator and ' 5 a pressure gas source connected thereto for driving liquid by means of pressure gas out of the hydraulic accumulator through an outgoing liquid tube arranged in the accumulator.
Certain kinds of petrol fires,~e.g. a kerosene fire in a jet engine of an aeroplane during engine test in a hangar intended for that purpose, are almost impos sible to extinguish, even by means of strong fog-like liquid sprays, as is proposed e.g.
in CA 2,103,069. Such a jet engine fire is not extinguished until the whole hangar in ques tion, which may typically have a volume of about 3000 cubic metres, has been subjected: to so-called "total flooding", which means that it has been filled with a liquid fog consisting of very small drops practically entirely.
The liquid fog required can be generated in principle by means of an equipment described in CA 2,123,706. In said application, an outgoing rising pipe of a hydraulic ac-_ cumulator is provided with apertures in its wall so that the drive gas of the accumulator initially drives out liquid only and the drive gas is being mixed into the outgoing liquid gradually after the liquid level has fallen to the level of the uppermost aperture in the tube wall, in increasing proportions according to the falling liquid level and more apertures in the tube wall becoming free. During final discharge stage of the accu-mulator, a liquid fog consisting of drops small enough for the present purpose can be achieved, but a far too large part of the liquid of the hydraulic accumulator is lost.
The gas source may be a container including nitrogen gas and having a charge pressure of e.g. about 200 bar, and it can be arranged to feed one hydraulic accumulator or a plurality of hydraulic accumulators connected in parallel.
The object of the invention is to provide a novel equipment enabling an efficient liquid delivery from one hydraulic accumulator or a plurality of hydraulic accumulators by mixing gas efficiently in the liquid immediately from the beginning.
In one embodiment there is provided a fire fighting equipment, comprising a hydraulic accumulator with a liquid container and a pressure gas source, a connection being provided for connecting the pressure gas source to the hydraulic accumulator, said pressure gas source being adapted to drive liquid by means of pressure gas out of the hydraulic accumulator through an outgoing liquid tube arranged in the accumulator, a throttle means being provided between the pressure gas source and the outgoing liquid tube, characterized by a check valve connected between the pressure gas source and the liquid container preventing back flow of gas from the liquid container to the throttle means.
The equipment according to the invention is mainly characterized in that the outgoing liquid tube comprises a throttling and that to the liquid tube, after said throttling, is connected a throttled gas inlet from a pressure gas source having a pressure 2a higher than the liquid pressure after the throttling of the outgoing liquid tube.
In a preferred embodiment of the invention, the pressure gas source connected to the throttled gas inlet is the same that is connected to the hydraulic accumulator for driving liquid out of this accumulator.
The throttling of the outgoing liquid tube and the throttled gas inlet are hereby preferably adapted to provide at least essentially equal pressure drops. If the gas source has a pressure of 100 bar, the respective throttlings can be dimensioned to provide a pressure drop of e.g. 5 bar.
If the pressure gas source is constituted by a pressure bottle, this can be connected to the hydraulic accumulator through a check valve loaded against the gas pressure, which valve shuts off the gas supply at a predeterminable pressure. Subsequently, the gas enclosed in the accumulator continues driving out gas WO 95/24239 218 4 8 9 5 pCT~~S/00130 by expanding, while the gas source continues delivering gas only through the throttled inlet after the throt-tling of the liquid tube.
In a preferred embodiment, the pressure gas source is coupled to the hydraulic accumulator through a connection, which comprises a housing provided with a gas inlet to the accumulator, an outgoing liquid tube and a mounting part for mounting in the outlet of the hydraulic accumulator, whereby the throttling of the outgoing liquid tube extends through the mounting part of the housing and the throttled gas inlet after the throttling of the liquid tube is constituted by at least one aperture in the wall of the liquid tube, which aper-ture is in contact with the gas inlet of the connection into the hydraulic accumulator. A ring channel between the throttling of the liquid tube and the mounting part surrounding the throttling offer a simple solution to an efficient gas supply at a high pressure.
If the gas source feeds more than one hydraulic accumulator, a gas outlet to the gas inlet of an adjac ent accumulator connection may preferably be arranged within the extent of the throttling of the liquid tube.
In the following, the invention will be de scribed with reference to the attached drawing including Figures 1, 2 and 3, showing two preferred embodiments of the equipment according to the invention.
The embodiment shown in the Figures 1 and 2 contains a connection A, comprising a housing 1 provided with a gas inlet 2 for being connected to a pressure gas source T, a threaded outgoing liquid tube 3, a hold 4 for a safety plug or alternatively a gas outlet 4 (pre-ferably of the same form as the inlet 2) to an adjacent similar connection A' of an adjacent hydraulic accumula-tor H' and a mounting part 5 provided with an external thread to be mounted in the outlet of a hydraulic accu-WO 95/24239 ~ ~ ~ ,~ 8 9 5 PCT/FI95/00130 mulator H. An outgoing rising tube of the hydraulic accumulator H is indicated by 6. An outlet end 7 of the tube 6 is connected to the outgoing tube 3 by means of a shear ring coupling 8. A support ring is indicated by 9 and a sealing ring arranged in connection with this is indicated by 10.
The tube 6 portion extending inside the mount-ing part 5 of the housing 1 in front and preferably in-cluding the gas inlet 2 as well is throttled in relation to the rest of the diameter dimension of the tube 6 and indicated by 11. Thanks to the throttled tube portion 11, a pressure drop is provided, as well as a ring chan-nel 12 between the tube portion 11 and the housing 1 from the gas inlet 2 along the mounting part 5 of the housing into a liquid container of the hydraulic accumu-lator H.
The ring channel 12 permits an efficient supply of drive gas to the liquid container of the hydraulic accumulator H and through that an efficient delivery of liquid into the outgoing tube 3.
After the throttling 11 is arranged a throttled gas inlet 13, which may be a suitably dimensioned aper-ture in the wall of the tube 6 and in direct contact with the gas inlet 2, as suggested in the drawing.
The pressure drop of the outflowing liquid over the throttling 11 is preferably equal to the gas pres-sure drop in the throttled inlet 13, e.g. about 5 bar.
A spring-loaded F check valve B acting against the pressure of the gas flowing through the ring channel 12 can be positioned around the liquid tube 6 before the throttling 11, e.g. in such a way that a ring element R strives to bear against the end of the mounting part 5.
The throttling of the tube portion 11 can be performed conveniently e.g. by means of existing clamp-ing means fog hoses of different kind. As to the other parts, the connection according to the invention is an extremely simple construction.
Figure 3 shows an alternative embodiment.
5 The liquid container of the hydraulic accumula-tor is not shown in the drawing. As to the liquid con-tainer and other general arrangements, reference is again made to FI 931405 equivalent to CA 2,147,379, Figures 7 to 9.
The present invention relates to a fire-fight-ing equipment, comprising a hydraulic accumulator and ' 5 a pressure gas source connected thereto for driving liquid by means of pressure gas out of the hydraulic accumulator through an outgoing liquid tube arranged in the accumulator.
Certain kinds of petrol fires,~e.g. a kerosene fire in a jet engine of an aeroplane during engine test in a hangar intended for that purpose, are almost impos sible to extinguish, even by means of strong fog-like liquid sprays, as is proposed e.g.
in CA 2,103,069. Such a jet engine fire is not extinguished until the whole hangar in ques tion, which may typically have a volume of about 3000 cubic metres, has been subjected: to so-called "total flooding", which means that it has been filled with a liquid fog consisting of very small drops practically entirely.
The liquid fog required can be generated in principle by means of an equipment described in CA 2,123,706. In said application, an outgoing rising pipe of a hydraulic ac-_ cumulator is provided with apertures in its wall so that the drive gas of the accumulator initially drives out liquid only and the drive gas is being mixed into the outgoing liquid gradually after the liquid level has fallen to the level of the uppermost aperture in the tube wall, in increasing proportions according to the falling liquid level and more apertures in the tube wall becoming free. During final discharge stage of the accu-mulator, a liquid fog consisting of drops small enough for the present purpose can be achieved, but a far too large part of the liquid of the hydraulic accumulator is lost.
The gas source may be a container including nitrogen gas and having a charge pressure of e.g. about 200 bar, and it can be arranged to feed one hydraulic accumulator or a plurality of hydraulic accumulators connected in parallel.
The object of the invention is to provide a novel equipment enabling an efficient liquid delivery from one hydraulic accumulator or a plurality of hydraulic accumulators by mixing gas efficiently in the liquid immediately from the beginning.
In one embodiment there is provided a fire fighting equipment, comprising a hydraulic accumulator with a liquid container and a pressure gas source, a connection being provided for connecting the pressure gas source to the hydraulic accumulator, said pressure gas source being adapted to drive liquid by means of pressure gas out of the hydraulic accumulator through an outgoing liquid tube arranged in the accumulator, a throttle means being provided between the pressure gas source and the outgoing liquid tube, characterized by a check valve connected between the pressure gas source and the liquid container preventing back flow of gas from the liquid container to the throttle means.
The equipment according to the invention is mainly characterized in that the outgoing liquid tube comprises a throttling and that to the liquid tube, after said throttling, is connected a throttled gas inlet from a pressure gas source having a pressure 2a higher than the liquid pressure after the throttling of the outgoing liquid tube.
In a preferred embodiment of the invention, the pressure gas source connected to the throttled gas inlet is the same that is connected to the hydraulic accumulator for driving liquid out of this accumulator.
The throttling of the outgoing liquid tube and the throttled gas inlet are hereby preferably adapted to provide at least essentially equal pressure drops. If the gas source has a pressure of 100 bar, the respective throttlings can be dimensioned to provide a pressure drop of e.g. 5 bar.
If the pressure gas source is constituted by a pressure bottle, this can be connected to the hydraulic accumulator through a check valve loaded against the gas pressure, which valve shuts off the gas supply at a predeterminable pressure. Subsequently, the gas enclosed in the accumulator continues driving out gas WO 95/24239 218 4 8 9 5 pCT~~S/00130 by expanding, while the gas source continues delivering gas only through the throttled inlet after the throt-tling of the liquid tube.
In a preferred embodiment, the pressure gas source is coupled to the hydraulic accumulator through a connection, which comprises a housing provided with a gas inlet to the accumulator, an outgoing liquid tube and a mounting part for mounting in the outlet of the hydraulic accumulator, whereby the throttling of the outgoing liquid tube extends through the mounting part of the housing and the throttled gas inlet after the throttling of the liquid tube is constituted by at least one aperture in the wall of the liquid tube, which aper-ture is in contact with the gas inlet of the connection into the hydraulic accumulator. A ring channel between the throttling of the liquid tube and the mounting part surrounding the throttling offer a simple solution to an efficient gas supply at a high pressure.
If the gas source feeds more than one hydraulic accumulator, a gas outlet to the gas inlet of an adjac ent accumulator connection may preferably be arranged within the extent of the throttling of the liquid tube.
In the following, the invention will be de scribed with reference to the attached drawing including Figures 1, 2 and 3, showing two preferred embodiments of the equipment according to the invention.
The embodiment shown in the Figures 1 and 2 contains a connection A, comprising a housing 1 provided with a gas inlet 2 for being connected to a pressure gas source T, a threaded outgoing liquid tube 3, a hold 4 for a safety plug or alternatively a gas outlet 4 (pre-ferably of the same form as the inlet 2) to an adjacent similar connection A' of an adjacent hydraulic accumula-tor H' and a mounting part 5 provided with an external thread to be mounted in the outlet of a hydraulic accu-WO 95/24239 ~ ~ ~ ,~ 8 9 5 PCT/FI95/00130 mulator H. An outgoing rising tube of the hydraulic accumulator H is indicated by 6. An outlet end 7 of the tube 6 is connected to the outgoing tube 3 by means of a shear ring coupling 8. A support ring is indicated by 9 and a sealing ring arranged in connection with this is indicated by 10.
The tube 6 portion extending inside the mount-ing part 5 of the housing 1 in front and preferably in-cluding the gas inlet 2 as well is throttled in relation to the rest of the diameter dimension of the tube 6 and indicated by 11. Thanks to the throttled tube portion 11, a pressure drop is provided, as well as a ring chan-nel 12 between the tube portion 11 and the housing 1 from the gas inlet 2 along the mounting part 5 of the housing into a liquid container of the hydraulic accumu-lator H.
The ring channel 12 permits an efficient supply of drive gas to the liquid container of the hydraulic accumulator H and through that an efficient delivery of liquid into the outgoing tube 3.
After the throttling 11 is arranged a throttled gas inlet 13, which may be a suitably dimensioned aper-ture in the wall of the tube 6 and in direct contact with the gas inlet 2, as suggested in the drawing.
The pressure drop of the outflowing liquid over the throttling 11 is preferably equal to the gas pres-sure drop in the throttled inlet 13, e.g. about 5 bar.
A spring-loaded F check valve B acting against the pressure of the gas flowing through the ring channel 12 can be positioned around the liquid tube 6 before the throttling 11, e.g. in such a way that a ring element R strives to bear against the end of the mounting part 5.
The throttling of the tube portion 11 can be performed conveniently e.g. by means of existing clamp-ing means fog hoses of different kind. As to the other parts, the connection according to the invention is an extremely simple construction.
Figure 3 shows an alternative embodiment.
5 The liquid container of the hydraulic accumula-tor is not shown in the drawing. As to the liquid con-tainer and other general arrangements, reference is again made to FI 931405 equivalent to CA 2,147,379, Figures 7 to 9.
Claims (8)
1. A fire-fighting equipment, comprising a hydraulic accumulator with a liquid container and a pressure gas source, a connection being provided for connecting the pressure gas source to the hydraulic accumulator, said pressure gas source being adapted to drive liquid by means of pressure gas out of the hydraulic accumulator through an outgoing liquid tube arranged in the accumulator, a throttle means being provided between the pressure gas source and the outgoing liquid tube, characterized by a check valve connected between the pressure gas source and the liquid container preventing back flow of gas from the liquid container to the throttle means.
2. An equipment according to claim 1, characterized in that the throttle means comprises a gas inlet formed after a throttling made in the outgoing liquid tube.
3. An equipment according to claim 2, characterized in that the throttling of the outgoing liquid tube and the gas inlet are adapted to provide essentially equal pressure drops.
4. An equipment according to claim 2, wherein the connection comprises a housing with a gas inlet to the accumulator, the outgoing liquid tube and a mounting part to be mounted in the outlet of the hydraulic accumulator, characterized in that the throttling of the outgoing liquid tube extends through the mounting part of the housing and that the gas inlet after the throttling of the liquid tube is constituted by at least one aperture in the wall of the liquid tube, which aperture is in contact with the gas inlet of the connection to the hydraulic accumulator.
5. An equipment according to claim 4, characterized in that the throttling of the liquid tube extends past the mounting part into the liquid container of the hydraulic accumulator.
6. An equipment according to claim 5, characterized in that the check valve comprises a ring element positioned around the liquid tube and loaded by a spring.
7. An equipment according to claim 4, characterized in that a gas outlet to the gas inlet of an adjacent accumulator connection is arranged within the extent of the throttling of the liquid tube.
8. A fire-fighting equipment comprising:
a hydraulic accumulator with a liquid container, the liquid container having a gas space;
a pressure gas source;
a connection connecting the pressure gas source to the hydraulic accumulator for feeding pressure gas to the liquid container through a gas inlet thereof and driving liquid by the pressure gas out of the hydraulic accumulator through a rising tube having a wall in the accumulator to an outgoing tube;
a throttle means in contact with the gas inlet and between the pressure gas source and the outgoing tube for mixing the pressure gas and the liquid in the outgoing tube; and a check valve connected between the gas inlet and the gas space of the liquid container for preventing backflow of the pressure gas from the liquid container to the throttle means.
a hydraulic accumulator with a liquid container, the liquid container having a gas space;
a pressure gas source;
a connection connecting the pressure gas source to the hydraulic accumulator for feeding pressure gas to the liquid container through a gas inlet thereof and driving liquid by the pressure gas out of the hydraulic accumulator through a rising tube having a wall in the accumulator to an outgoing tube;
a throttle means in contact with the gas inlet and between the pressure gas source and the outgoing tube for mixing the pressure gas and the liquid in the outgoing tube; and a check valve connected between the gas inlet and the gas space of the liquid container for preventing backflow of the pressure gas from the liquid container to the throttle means.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI941174 | 1994-03-11 | ||
| FI941174A FI941174A0 (en) | 1994-03-11 | 1994-03-11 | Anordning Foer eldslaeckning |
| PCT/FI1995/000130 WO1995024239A1 (en) | 1994-03-11 | 1995-03-09 | Delivery of fire-extinguishing material by a pressure gas source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2184895A1 CA2184895A1 (en) | 1995-09-14 |
| CA2184895C true CA2184895C (en) | 2005-10-04 |
Family
ID=35395855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002184895A Expired - Fee Related CA2184895C (en) | 1994-03-11 | 1995-03-09 | Delivery of fire-extinguishing material by a pressure gas source |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2184895C (en) |
-
1995
- 1995-03-09 CA CA002184895A patent/CA2184895C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2184895A1 (en) | 1995-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140311 |