EP1936317B1 - Nozzle - Google Patents
Nozzle Download PDFInfo
- Publication number
- EP1936317B1 EP1936317B1 EP06126990A EP06126990A EP1936317B1 EP 1936317 B1 EP1936317 B1 EP 1936317B1 EP 06126990 A EP06126990 A EP 06126990A EP 06126990 A EP06126990 A EP 06126990A EP 1936317 B1 EP1936317 B1 EP 1936317B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- opening
- weapon
- area
- spoiler
- 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.)
- Active
Links
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000010304 firing Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 description 6
- 239000012080 ambient air Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A1/00—Missile propulsion characterised by the use of explosive or combustible propellant charges
- F41A1/08—Recoilless guns, i.e. guns having propulsion means producing no recoil
Definitions
- the present invention relates to a nozzle for a weapon comprising a launcher which constitutes a guide for a projectile or missile; the nozzle comprises a wall, a first opening connected to the launcher and a second opening. The area of the first opening is smaller than the area of the second opening.
- Weapons such as handheld weapons from which a projectile or missiles are shot are in some cases provided with a launcher without a nozzle.
- the nozzle is arranged in the rear end of a launcher which constitutes a guide for the projectile.
- the projectile is guided by the launcher and leaves the front end of the launcher towards a target.
- a flame is created by the projectile when the weapon is fired. The flame creates gases of high temperature which expands at the rear end of the launcher of the weapon, through the nozzle. In this connection also a high pressure being created behind the launcher.
- the countermass may be a liquid enclosed in a container arranged in the launcher behind the projectile.
- the countermass in form of liquid leaves the rear end of the weapon when the weapon is fired and thereby produces a pressure-reducing effect adjacent to the weapon when the countermass expands and disintegrates.
- Documents SE 0301626-8 and SE 0301627-6 discloses examples of such countermass containers for weapons.
- Document DE-A1-1578050 discloses a weapon that forms the basis for the preamble of claim 1.
- one drawback is that when the countermass is a liquid, a cloud is formed around the weapon, which makes it difficult to rapidly achieve a clear view of the target for firing the weapon again.
- Another drawback of using a countermass is that an asymmetrical flow may be created in the countermass container, which can produce great shear forces on the weapon. Also, pieces from the container may come away from the container and constitute a risk behind the weapon.
- the objective problem to be solved by the present invention is to avoid that a liquid cloud is formed around the weapon when the weapon is fired.
- Another objective problem to be solved by the present invention is to reduce the pressure behind a weapon
- Yet another objective problem to be solved by the present invention is to eliminate the need of a countermass in a weapon.
- Yet another objective problem to be solved by the present invention is to reduce the recoil in the forward direction.
- Ambient air is used to reduce the temperature of the hot gases which leaves the rear end of the weapon through the nozzle.
- energy is transformed which reduces also the pressure inside the hot gases. Since the pressure is reduced also the recoil on the weapon is reduced.
- the ambient air is introduced in the hot gases by the means provided at the nozzle.
- said means is a spoiler is arranged substantially inside the nozzle in the area of the second opening.
- the spoiler creates a low pressure on one of its surfaces when the gases pass the spoiler. The low pressure reduces the temperature of the gases. Also, the low pressure created by the spoiler leads to that ambient air is sucked in through the second opening of the nozzle and thereby reduces the temperature of the gases from the projectile.
- the gases within the nozzle are under expanded.
- a circumferential element is arranged at the first opening of the nozzle.
- the circumferential element has an opening area which is less than the area of the first opening of the nozzle. The effect achieved by this element is that recoil in the forward direction is reduced when the weapon is fired.
- a weapon with such a nozzle is easy to handle, cost effective when manufacturing and have no problems with shear forces which may occur when using a countermass.
- said means 18 is a spoiler 18' arranged substantially inside the nozzle 1 in the area of the second opening 12.
- the spoiler 18' is so arranged inside the nozzle 1 that an opening gap 22 is created between the wall 8 of the nozzle 1 and the spoiler 18'.
- Fig. 2 shows a perspective view of the second embodiment.
- the spoiler 18' has a form which is substantial circular and is connected to the wall 8 by distance elements 24.
- the distance elements 24 have an aerodynamic form that not disturbs the flow of the gases 16.
- the gases 16 from the projectile 6 passes through the nozzle 1 with high velocity.
- the spoiler 18' creates a low pressure on one of its surfaces when the gases 16 pass the spoiler 18', which is indicated in fig 5.
- the low pressure reduces the temperature of the gases 16 and the low pressure LP created by the spoiler 18' also leads to that ambient air is sucked in through the second opening 12 of the nozzle 1 and thereby reduces the temperature of the gases 16 from the projectile 6.
- a circumferential element 26 is arranged at the first opening 10 of the nozzle 1.
- An opening area 28 of the circumferential element 26 is less than the area of the first opening 10 of nozzle 1.
- a circumferential abutment 30 or edge is created by the element 26.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Toys (AREA)
- Percussion Or Vibration Massage (AREA)
- Surgical Instruments (AREA)
Abstract
Description
- The present invention relates to a nozzle for a weapon comprising a launcher which constitutes a guide for a projectile or missile; the nozzle comprises a wall, a first opening connected to the launcher and a second opening. The area of the first opening is smaller than the area of the second opening.
- Weapons such as handheld weapons from which a projectile or missiles are shot are in some cases provided with a launcher without a nozzle. The nozzle is arranged in the rear end of a launcher which constitutes a guide for the projectile. When the weapon is fired the projectile is guided by the launcher and leaves the front end of the launcher towards a target. Also a flame is created by the projectile when the weapon is fired. The flame creates gases of high temperature which expands at the rear end of the launcher of the weapon, through the nozzle. In this connection also a high pressure being created behind the launcher.
- In order to decrease the recoil and thus make possible an increase in weight of the projectile without excessively high pressure being created behind the launcher, it has been known for many years to introduce what is known as a countermass. The countermass may be a liquid enclosed in a container arranged in the launcher behind the projectile. The countermass in form of liquid leaves the rear end of the weapon when the weapon is fired and thereby produces a pressure-reducing effect adjacent to the weapon when the countermass expands and disintegrates. Documents
SE 0301626-8 SE 0301627-6 - Document
DE-A1-1578050 discloses a weapon that forms the basis for the preamble ofclaim 1. - However, one drawback is that when the countermass is a liquid, a cloud is formed around the weapon, which makes it difficult to rapidly achieve a clear view of the target for firing the weapon again. Another drawback of using a countermass is that an asymmetrical flow may be created in the countermass container, which can produce great shear forces on the weapon. Also, pieces from the container may come away from the container and constitute a risk behind the weapon.
- The objective problem to be solved by the present invention is to avoid that a liquid cloud is formed around the weapon when the weapon is fired.
- Another objective problem to be solved by the present invention is to reduce the pressure behind a weapon
- Yet another objective problem to be solved by the present invention is to eliminate the need of a countermass in a weapon.
- Yet another objective problem to be solved by the present invention is to reduce the recoil in the forward direction.
- This is achieved by a nozzle according to
claim 1. - Ambient air is used to reduce the temperature of the hot gases which leaves the rear end of the weapon through the nozzle. When ambient air is introduced in the hot gases, energy is transformed which reduces also the pressure inside the hot gases. Since the pressure is reduced also the recoil on the weapon is reduced. The ambient air is introduced in the hot gases by the means provided at the nozzle.
- According to are embodiment said means is a spoiler is arranged substantially inside the nozzle in the area of the second opening. When the weapon is fired the gases from the projectile passes through the nozzle with high velocity. The spoiler creates a low pressure on one of its surfaces when the gases pass the spoiler. The low pressure reduces the temperature of the gases. Also, the low pressure created by the spoiler leads to that ambient air is sucked in through the second opening of the nozzle and thereby reduces the temperature of the gases from the projectile. According to this embodiment the gases within the nozzle are under expanded.
- According to yet another embodiment of the invention a circumferential element is arranged at the first opening of the nozzle. The circumferential element has an opening area which is less than the area of the first opening of the nozzle. The effect achieved by this element is that recoil in the forward direction is reduced when the weapon is fired.
- When a nozzle provided with said means is used in a weapon a liquid cloud is not formed around the weapon when the weapon is fired since there is no need for a countermass. Therefore it is possible to rapidly firing the weapon again since no liquid cloud restricts the view of the target.
- Also, a weapon with such a nozzle is easy to handle, cost effective when manufacturing and have no problems with shear forces which may occur when using a countermass.
- Other advantages and features of the invention can be derived from the following detailed description of exemplary embodiments of the invention, with reference to the drawings.
-
Fig. 1 shows a section view of a nozzle according to an embodiment of the invention, -
Fig. 2 shows a view in perspective of the nozzle according to an embodiment, and - Fig.53 shows a section view of a nozzle according to an embodiment of the invention with a reduced pressure area indicated.
- According to an embodiment of the invention disclosed in
fig. 1 said means 18 is a spoiler 18' arranged substantially inside thenozzle 1 in the area of the second opening 12. The spoiler 18' is so arranged inside thenozzle 1 that anopening gap 22 is created between thewall 8 of thenozzle 1 and the spoiler 18'. -
Fig. 2 shows a perspective view of the second embodiment. The spoiler 18' has a form which is substantial circular and is connected to thewall 8 bydistance elements 24. Preferably, thedistance elements 24 have an aerodynamic form that not disturbs the flow of thegases 16. - When the
weapon 2 is fired thegases 16 from theprojectile 6 passes through thenozzle 1 with high velocity. The spoiler 18' creates a low pressure on one of its surfaces when thegases 16 pass the spoiler 18', which is indicated in fig 5. The low pressure reduces the temperature of thegases 16 and the low pressure LP created by the spoiler 18' also leads to that ambient air is sucked in through thesecond opening 12 of thenozzle 1 and thereby reduces the temperature of thegases 16 from theprojectile 6. - According to a second embodiment of the invention a circumferential element 26 is arranged at the first opening 10 of the
nozzle 1. An opening area 28 of the circumferential element 26 is less than the area of the first opening 10 ofnozzle 1. Hence, a circumferential abutment 30 or edge is created by the element 26. When theweapon 2 is fired a pressure from thegases 16 created by theprojectile 6 is exerted on the element 26. Therefore, recoil in the forward direction of theweapon 2 is reduced.
Claims (8)
- Nozzle for a weapon (2) comprising a launcher (4) which constitutes a guide for a projectile or missile (6); the nozzle (1) comprises a wall (8), a first opening (10) connected to the launcher (4) and a second opening (12); characterized in that the area of the first opening (10) is smaller than the area of the second opening (12); the nozzle (1) has the form of a funnel; the nozzle (1) is provided with means (18; 18') for reducing the pressure of gases (16) from the projectile (6) inside and behind the nozzle (1) when firing the weapon (2); said means is a spoiler (18') arranged substantially inside the nozzle (1) in the area of the second opening (12) and the spoiler (18') is so arranged inside the nozzle (1) that an opening gap (22) is created between the wall (8) of the nozzle (1) and the spoiler (18').
- Nozzle according to claim 1, characterized in that said means (18;18') is arranged at the second opening of the nozzle.
- Nozzle according to any of the preceding claims, characterized in that the first and second openings (10,12) are substantially cylindrical.
- Nozzle according to any of the preceding claims, characterized in that the first and second openings (10,12) are arranged substantially concentric with each others.
- Nozzle according to any of the preceding claims, characterized in that a gas generator (14) is arranged in the area of the first opening (10).
- Nozzle according to claim 1, characterized in that the spoiler (18') has a form which is substantial circular.
- Nozzle according to claim 1 or 6, characterized in that the spoiler (18') is connected to the wall (8) by distance elements (24).
- Nozzle according to any of the preceding claims, characterized in that a circumferential element (26) is arranged at the first opening (10) of the nozzle (1) and in that an opening area (28) of the circumferential element (26) is less than the area of the first opening (10) of the nozzle (1).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT06126990T ATE448459T1 (en) | 2006-12-22 | 2006-12-22 | JET |
EP06126990A EP1936317B1 (en) | 2006-12-22 | 2006-12-22 | Nozzle |
DE602006010422T DE602006010422D1 (en) | 2006-12-22 | 2006-12-22 | jet |
ES06126990T ES2333666T3 (en) | 2006-12-22 | 2006-12-22 | NOZZLE. |
US12/003,319 US20100275763A1 (en) | 2006-12-22 | 2007-12-21 | Nozzle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06126990A EP1936317B1 (en) | 2006-12-22 | 2006-12-22 | Nozzle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1936317A1 EP1936317A1 (en) | 2008-06-25 |
EP1936317B1 true EP1936317B1 (en) | 2009-11-11 |
Family
ID=38038731
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06126990A Active EP1936317B1 (en) | 2006-12-22 | 2006-12-22 | Nozzle |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100275763A1 (en) |
EP (1) | EP1936317B1 (en) |
AT (1) | ATE448459T1 (en) |
DE (1) | DE602006010422D1 (en) |
ES (1) | ES2333666T3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018212691A1 (en) | 2017-05-17 | 2018-11-22 | Saab Ab | Breech and method for noise reduction |
US10788284B1 (en) * | 2019-05-09 | 2020-09-29 | The United States Of America As Represented By The Secretary Of The Army | Grounded and vehicular mounted weapons with improved recoil stability |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2557151A (en) * | 1944-08-24 | 1951-06-19 | Leslie A Skinner | Spring actuated generator for rocket launchers |
US2598256A (en) * | 1945-04-21 | 1952-05-27 | Us Sec War | Recoilless gun |
BE560119A (en) * | 1956-09-13 | |||
US2956479A (en) * | 1958-02-28 | 1960-10-18 | Musser C Walton | Cascaded gun barrel |
US3035494A (en) * | 1960-01-26 | 1962-05-22 | Musser C Walton | Recoil adjusting device |
US3251552A (en) * | 1963-03-07 | 1966-05-17 | Douglas M Ford | Exhaust nozzle for jet or rocket motors |
DE977818C (en) * | 1963-06-22 | 1970-12-17 | Messerschmitt Boelkow Blohm | Propellant charge arrangement for tubular launchers |
US3208384A (en) * | 1964-01-21 | 1965-09-28 | Fountain Gilbert | Rocket thrust neutralizer |
DE1428637C1 (en) * | 1964-02-26 | 1975-02-20 | Messerschmitt Boelkow Blohm | Tubular launcher for projectiles, especially for missiles |
FR1410375A (en) * | 1964-07-30 | 1965-09-10 | Tech De Rech S Eindustrielles | Small footprint weapon |
NL132545C (en) * | 1967-03-16 | |||
DE1678189A1 (en) * | 1968-03-12 | 1972-01-13 | Ludwig Bucklisch | Recoil-free weapon |
SE416230B (en) * | 1976-05-17 | 1980-12-08 | Bofors Ab | DEVICE FOR RECYCLING EXPLOITATION OF A MISSILE |
US4043248A (en) * | 1976-06-10 | 1977-08-23 | General Electric Company | Liquid propellant gun (recoilless regenerative piston) |
US4091709A (en) * | 1976-07-26 | 1978-05-30 | The United States Of America As Represented By The Secretary Of The Army | Recoilless rifle nozzle |
US4203347A (en) * | 1978-04-10 | 1980-05-20 | The Boeing Company | Shock suppressing apparatus and method for a rocket launcher |
US4404887A (en) * | 1980-06-23 | 1983-09-20 | General Dynamics, Pomona Division | Recoil reducer |
SE524912C2 (en) | 2003-06-05 | 2004-10-19 | Saab Ab | Round weapon pressure lowering countermass in countermass container including guiding fold support for symmetrical opening process |
SE525137C2 (en) | 2003-06-05 | 2004-12-07 | Saab Ab | Apparatus for weapons comprising a countermass to lower the pressure around the weapon, the main component of the countermass being fluid which is bound and retained by capillary forces |
-
2006
- 2006-12-22 DE DE602006010422T patent/DE602006010422D1/en active Active
- 2006-12-22 EP EP06126990A patent/EP1936317B1/en active Active
- 2006-12-22 ES ES06126990T patent/ES2333666T3/en active Active
- 2006-12-22 AT AT06126990T patent/ATE448459T1/en not_active IP Right Cessation
-
2007
- 2007-12-21 US US12/003,319 patent/US20100275763A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20100275763A1 (en) | 2010-11-04 |
ATE448459T1 (en) | 2009-11-15 |
ES2333666T3 (en) | 2010-02-25 |
EP1936317A1 (en) | 2008-06-25 |
DE602006010422D1 (en) | 2009-12-24 |
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