WO1999012653A1 - Sistema de inyeccion de gases en una pistola de proyeccion por detonacion - Google Patents
Sistema de inyeccion de gases en una pistola de proyeccion por detonacion Download PDFInfo
- Publication number
- WO1999012653A1 WO1999012653A1 PCT/ES1997/000223 ES9700223W WO9912653A1 WO 1999012653 A1 WO1999012653 A1 WO 1999012653A1 ES 9700223 W ES9700223 W ES 9700223W WO 9912653 A1 WO9912653 A1 WO 9912653A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- detonation
- gas
- gases
- combustion chamber
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/0006—Spraying by means of explosions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/126—Detonation spraying
Definitions
- the present invention is applicable in the area of thermal projection technologies for the production of coatings and, in particular, in detonation projection technologies.
- the object of the present invention is to provide a gas injection device for a detonation spray gun that provides great safety in its use as well as greater productivity and versatility.
- detonation projection technology is mainly used for the application of coatings to parts that are exposed to severe conditions of wear, heat or corrosion and is based primarily on the use of kinetic energy produced by the detonation of a mixture of combustible gases to deposit some powder coating material on the piece.
- the coating materials commonly used in detonation processes include metal, ceramic-ethanol, ceramic powders, etc. and are applicable to improve resistance to wear, erosion, corrosion, as insulators thermal and as insulators or electrical conductors.
- the detonation projection is carried out by means of projection guns basically composed of a tubular detonation chamber, with a closed and an open end to which a tubular barrel is also attached.
- the combustion gases are injected inside the detonation chamber and through a spark plug the ignition of the gas mixture that causes a detonation takes place and as a consequence a shock wave or pressure that propagates, at supersonic speeds, by the inside of the chamber and then through the inside of the barrel until it comes out of the open end of it
- Powders of coating material are generally injected into the barrel just before the propagation front of the pressure wave arrives and consequently they are dragged by this wave to the end of the barrel by depositing on a substrate or piece arranged in front of said barrel. This impact of the coating powders on a substrate produces a high density coating that has very large adhesive characteristics.
- This process is repeated cyclically until the part is adequately coated.
- the gases that constitute the mixture to be detonated, oxygen and a fuel such as natural gas, propane, propylene, hydrogen or acetylene are mixed before entering the detonation chamber in a prechamber that guarantees the homogeneity of the mixture in the detonation chamber at the time of the explosion.
- the chambers or ducts in which the gases are mixed constitute a volume in which it is necessary to ensure the absence of flame returns and the shock wave of the detonation to prevent them from advancing through the oxygen and gas supply lines.
- valve system in addition to adding complexity to the equipment, being a mechanical system composed of moving parts creates reliability problems and limits the productivity of the same. These equipment are exceeded in productivity by more modern equipment that eliminates moving parts thus reducing maintenance downtime and increasing the deposition rates of coating powders.
- the mixing chamber is filled with a neutral gas, for example nitrogen or a noble gas, which prevents propagation inside.
- This device has as its main drawback its low productivity.
- the tortuous path or labyrinth must have a very special geometry that depends on the composition of the gas mixture, since the dimensions detonation cells depend on the gas mixture and, therefore, the labyrinth must be specially designed to cause the annihilation of the cells that propagate through it.
- This represents a serious inconvenience since the equipment is designed and valid for the cells corresponding to certain combustible mixtures, requiring a new maze design or, in the best case, a readjustment of its geometry to be able to safely use a different mixture of gases that involves cells of different dimensions.
- the design of the labyrinth only guarantees the safety of the system in a limited range of composition of the mixture and pressure of the gases in the combustion chamber.
- the present invention resolves the above-mentioned inconveniences to a complete satisfaction by means of a continuous gas feeding system that directly and separately communicates the sources of oxygen and combustible gas supply with the detonation chamber without there being an intermediate chamber or conduit in which they are mixed the combustible gases with the oxygen before its passage to the detonation chamber.
- the device that is recommended does not consist of valves or moving parts to close the communication between the detonation chamber and the gas supply ducts and consists only of a series of independent passages for each of the gases whose design and dimensions allow to achieve Cyclical detonations with a continuous feed of gases, also ensuring a fast and good distribution of the gases in the detonation chamber to obtain a fast and efficient homogeneity of the mixture.
- each of the independent passages that communicate each of the feed lines with the detonation chamber is comprised of an expansion chamber and a plurality of distributor ducts of reduced cross-section and / or elevated length such that each gas accesses the detonation chamber separated from the rest of the gases and through a plurality of small holes, as a shower, which guarantees a correct spatial distribution of the gases inside the detonation chamber and consequently a good homogeneity of the fuel mixture that occurs in the detonation chamber prior to the explosion.
- the generated pressure wave advances in all directions, preferably through the barrel, and even through the multiple gas distribution conduits that open to the detonation chamber.
- the advance of the gases through the distribution ducts occurs with difficulty so that the gases lose a lot of heat, by thermal transmission with the external surface of the ducts, cooling to a lower temperature at the ignition temperature of the mixture.
- This volume or package of cold gases prevents the already detonated gases from being in direct contact with the new volume of gases thus preventing combustion from spreading to the new gases, that is, the detonating gases cooled inside the distribution ducts they act as a barrier that cyclically separates volumes of gases that will cause combustion and consequently cyclically detonations.
- this injection system based on a series of independent passages consisting of multiple ducts of reduced cross-section and / or high length, it is possible to automatically transform a continuous feed of gases into cyclical detonations inside the detonation chamber .
- the device also acts as a safety valve preventing the pressure wave from reaching the gas supply lines after each explosion since the special geometry of the distributor ducts causes the gas to progress slowly through its interior so that before the front of the pressure wave reaches the power lines, the entire volume of the explosion has already left the barrel and therefore the pressure of the wave disappears quickly.
- the system is intrinsically safe as there is no volume of explosive mixture, oxygen and combustible gas, in any chamber or duct of the device except in the detonation chamber. This means that even if the flashback occurred, it would not have serious consequences since both oxygen and fuel (except acetylene) alone are not able to burn and much less explode.
- the firing frequency is higher than in the current equipment since in addition to not having moving parts, it is not necessary to fill the volume of gas and oxygen of the mixing chamber between two successive shots that in other systems are lost by the combustion of them. This means that we can get a faster filling of the detonation chamber and therefore obtain a higher working frequency.
- the device of the invention is arranged directly between the gas supply lines and the detonation chamber and can be embodied in the walls of the chamber itself, in a rod or cylinder axially placed in the chamber, or preferably in one or more bushings. internally coupled to the detonation chamber.
- the expansion chambers are arranged on the periphery of the aforementioned bushings, they can cover an arc of circumference or the total circumference, in which case the feeding lines should be arranged radially in relation to the detonation chamber.
- Figure 1 Schematically shows a detonation projection equipment according to the object of the invention, in which they have been used for get the explosive mixture a fuel, a nitrogen gas and oxygen.
- Figure 2. It shows an embodiment in which the gas injection system is constituted by two concentric bushings each equipped with an expansion chamber and a plurality of distributor holes that communicate with the detonation chamber.
- Figure 3 shows a perspective of the embodiment shown in Figure 2, that is, in which the injection system is formed by a bushing provided with annular expansion chambers and a plurality of distributor holes.
- Figure 4.- Shows an embodiment in which the gas injection system is constituted by a single cylindrical bushing provided, for each of the gases, with a radial expansion chamber and a plurality of distributor holes communicating with the chamber. detonation
- Figure 5 shows a perspective of the embodiment shown in Figure 4, that is, in which the injection system is formed by a bushing provided with radial expansion chambers and a plurality of distributor holes.
- Figure 6. Shows an embodiment of the injection system using a porous material.
- Figure 7 shows an embodiment of the injection system in which the injection system is constituted by an axial rod or cylinder, provided for each of the gases of an axial expansion chamber and a plurality of distributor holes that open to the detonation chamber.
- a detonation spray gun is mainly composed of a detonation chamber (1), cylindrical and a cylindrical barrel (2) coupled to the open end of the combustion chamber.
- a spark plug (3) is provided that allows ignition of the fuel mixture.
- the combustion gases reach the detonation chamber through feed conduits (4), while the coating powders are fed to the barrel (2) and therefore in an area that is located after the detonation chamber.
- the gas injection system object of the invention allows the gas feeding directly and independently to the detonation chamber (1) without a prior mixing of the aforementioned gases before reaching the detonation chamber (1).
- the proposed injection system is constituted by a series of independent passages, each of which is constituted by an expansion chamber (8) and a plurality of distributor ducts (9) that communicate the expansion chamber (8) with the detonation chamber (1) through multiple points that allow a rapid injection thereof as well as a good spatial distribution in the detonation chamber (1) that allows guarantee a good homogeneity of the mixture before combustion.
- the distribution ducts (9) have a reduced cross-section and / or a high length so that the detonation gases that progress through them lose enough heat so that their temperature drops, inside said ducts (9), up to to reach a value lower than the combustion temperature of the mixture constituting a thermal barrier between the gases already detonated and the next volume of gases that will fill the detonation chamber. In this way and simply by means of the geometric configuration of the gas feeding passages it is possible to obtain cyclical detonations using a continuous gas feeding.
- the injection system is composed of two annular bushes (6) (6 ') concentric that fit inside the detonation chamber also acting as a closure of it by its rear end.
- the gas supply passages are constituted by a series of channels (8) (8 '), determining ring sectors that constitute as many radial and independent expansion chambers, one for each feed gas, and a plurality of holes (9) (9 ') that distribute the gas contained in each of the volumes defined by said expansion chambers (8) (8').
- the ducts distributors (9) of the outer bushing (6) communicate the chambers (8) with the expansion chambers (8 ') of the inner bushing (7), and finally, the distributor ducts (9') of the outer bushing (7) establish the communication with the detonation chamber (1).
- this embodiment can be realized with a single socket internally coupled to the detonation chamber (1) and which communicates the gas supply lines (4) with the detonation chamber (1), by means of an expansion chamber (8 ) and a plurality of distributor ducts (9).
- the channels (8) define a series of independent chambers or volumes, as collectors, which each communicate directly with one of the gas supply lines (4) for each of the gases reach the detonation chamber (1), without mixing with the rest of the gases, through multiple conduits (9).
- FIGs 4 and 5 a variant of the embodiment of Figure 2 is shown in which the channels (8) provided in the bushings (6) and (7) extend along the entire periphery of the bushing, determining channels annular which constitute two expansion chambers, also annular, for each feed gas.
- a solution with a single cylindrical bushing internally coupled to the detonation chamber has been represented in figures (4) and (5), but obviously it could be constituted from two concentric bushes as shown in figures (2) and (3). ).
- Figure 6 represents an embodiment in which in the volume defined by the expansion chambers ( ⁇ ) provided in the outer sleeve (6) there is a porous material (12) that hinders the progression of the pressure wave through it.
- FIG 7 an embodiment is shown in which the injection system is embodied in a rod or central cylinder (13) arranged concentrically and internally to the detonation chamber (1) incorporating a series of longitudinal ducts (14) which determine longitudinal expansion chambers and a multiplicity and radial holes (15) constituting the corresponding distributor ducts that communicate each expansion chamber with the detonation chamber through multiple points distributed on the periphery of said rod (13).
- One of the main advantages of the invention refers to the fact that the feeding of each of the gases is carried out, either radially, annularly, or axially through an independent passage (5) so that the gases meet separated until reaching the detonation chamber, chamber inside which the fuel mixture is directly made, there being no other volume or conduit in which a combustible mixture is present. In this way, even if there is a certain flashback that reaches any of the gas supply passages, combustion of the same could not occur, much less detonation since each of them alone is not able to burn or much less explode.
- the gas supply is continuous, that is, there are no valves or mechanical or other elements that open or close the gas supply to the detonation gun.
- the gas feeding being carried out directly from the feed lines to the detonation chamber (1) producing in it the fuel mixture and ignition thereof, by means of the spark plug, first causing combustion of the mixture and then the detonation, detonation that progresses both through the canyon (2) and through the passages.
- the actual advance of the shock wave through the passages blocks the supply of gases to the detonation chamber, thus converting, continuously, without the need for valves or other mechanical devices, the continuous feeding of the gases into a cyclic supply to the detonation chamber that allows cyclic detonations to be produced and therefore highly effective. It should not be forgotten that the propagation speed of a combustion process is clearly lower than the speed of a detonation process.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Nozzles (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
Claims
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU42096/97A AU754654B2 (en) | 1997-09-11 | 1997-09-11 | System for injecting gas into a detonation projection gun |
BR9714940-3A BR9714940A (pt) | 1997-09-11 | 1997-09-11 | Sistema de alimentação de gás para uma pistola de pulverização por detonação |
AT97940162T ATE291967T1 (de) | 1997-09-11 | 1997-09-11 | System zur einspritzung von gas in eine vorrichtung für detonationsspritzen |
CA002303014A CA2303014C (en) | 1997-09-11 | 1997-09-11 | Gas feeding system for a detonation spray gun |
DK97940162T DK1013344T3 (da) | 1997-09-11 | 1997-09-11 | System til indspröjtning af gas i en detonationspröjtepistol |
JP2000510534A JP4155706B2 (ja) | 1997-09-11 | 1997-09-11 | デトネーション・スプレー・ガンのガス供給システム |
DE69732925T DE69732925T2 (de) | 1997-09-11 | 1997-09-11 | System zur einspritzung von gas in eine vorrichtung für detonationsspritzen |
PCT/ES1997/000223 WO1999012653A1 (es) | 1997-09-11 | 1997-09-11 | Sistema de inyeccion de gases en una pistola de proyeccion por detonacion |
US09/508,446 US6517010B1 (en) | 1997-09-11 | 1997-09-11 | System for injecting gas into a detonation projection gun |
EP97940162A EP1013344B1 (en) | 1997-09-11 | 1997-09-11 | System for injecting gas into a detonation projection gun |
ES97940162T ES2239786T3 (es) | 1997-09-11 | 1997-09-11 | Sistema de inyeccion de gases de una pistola de proyeccion por detonacion. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/ES1997/000223 WO1999012653A1 (es) | 1997-09-11 | 1997-09-11 | Sistema de inyeccion de gases en una pistola de proyeccion por detonacion |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999012653A1 true WO1999012653A1 (es) | 1999-03-18 |
Family
ID=8298108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES1997/000223 WO1999012653A1 (es) | 1997-09-11 | 1997-09-11 | Sistema de inyeccion de gases en una pistola de proyeccion por detonacion |
Country Status (10)
Country | Link |
---|---|
US (1) | US6517010B1 (es) |
EP (1) | EP1013344B1 (es) |
JP (1) | JP4155706B2 (es) |
AT (1) | ATE291967T1 (es) |
AU (1) | AU754654B2 (es) |
CA (1) | CA2303014C (es) |
DE (1) | DE69732925T2 (es) |
DK (1) | DK1013344T3 (es) |
ES (1) | ES2239786T3 (es) |
WO (1) | WO1999012653A1 (es) |
Cited By (4)
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WO2001030506A1 (es) * | 1999-10-28 | 2001-05-03 | Aerostar Coatings, S.L. | Pistola de proyeccion por detonacion de alta frecuencia de disparo y alta productividad |
WO2004110644A1 (fr) * | 2003-05-08 | 2004-12-23 | Kadyrov, Togrul Abdulla Oglu | Installation a detonation de gaz destinee a l'application de poudres |
WO2007132028A1 (es) | 2006-05-12 | 2007-11-22 | Fundacion Inasmet | Procedimiento de obtención de recubrimientos cerámicos y recubrimientos cerámicos obtenidos |
EP2202328A1 (en) | 2008-12-26 | 2010-06-30 | Fundacion Inasmet | Process for obtaining protective coatings for high temperature with high roughness and coating obtained |
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US6319560B1 (en) * | 2000-03-29 | 2001-11-20 | Sulzer Metco (Us) Inc. | Apparatus and method for coating the outer surface of a workpiece |
US7449068B2 (en) * | 2004-09-23 | 2008-11-11 | Gjl Patents, Llc | Flame spraying process and apparatus |
US7254914B2 (en) * | 2005-05-25 | 2007-08-14 | Lund Technologies, Llc | Hydrogen operated recreational launcher |
US20070113781A1 (en) * | 2005-11-04 | 2007-05-24 | Lichtblau George J | Flame spraying process and apparatus |
US20100034979A1 (en) | 2006-06-28 | 2010-02-11 | Fundacion Inasmet | Thermal spraying method and device |
US7926403B1 (en) * | 2006-06-29 | 2011-04-19 | Utron Inc. | Transient, high rate, closed system cryogenic injection |
US8465602B2 (en) | 2006-12-15 | 2013-06-18 | Praxair S. T. Technology, Inc. | Amorphous-nanocrystalline-microcrystalline coatings and methods of production thereof |
JP5659343B2 (ja) * | 2010-06-30 | 2015-01-28 | 国立大学法人広島大学 | パルスデトネーション溶射装置及び溶射方法 |
EP2832451A4 (en) * | 2012-03-28 | 2015-12-23 | Fujisaki Electric Co Ltd | LIQUID EJECTION APPARATUS AND LIQUID EJECTION METHOD |
CN108535446B (zh) * | 2018-04-19 | 2023-08-22 | 河南工程学院 | 管道瓦斯爆炸引起沉积煤尘二次爆炸的实验装置与方法 |
CN109158777B (zh) * | 2018-09-20 | 2020-11-10 | 中广核工程有限公司 | 深孔内壁激光3d打印的送粉管路冷却水套装置 |
WO2020171930A1 (en) * | 2019-02-19 | 2020-08-27 | Stoneage, Inc. | Switcher nozzle high efficiency flow insert |
GB2600172A (en) * | 2020-10-26 | 2022-04-27 | Stuart Drysdale Neil | Combustion gun |
CN113122793A (zh) * | 2021-04-14 | 2021-07-16 | 西北工业大学 | 一种爆炸喷涂装置 |
US11988473B1 (en) | 2022-04-04 | 2024-05-21 | Mach Industries Inc. | Oxyhydrogen kinetic energy weapons system |
CN115595528A (zh) * | 2022-09-07 | 2023-01-13 | 华能太原东山燃机热电有限责任公司(Cn) | 一种适用于氢气预混燃烧的爆炸喷涂装置 |
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- 1997-09-11 AT AT97940162T patent/ATE291967T1/de not_active IP Right Cessation
- 1997-09-11 DK DK97940162T patent/DK1013344T3/da active
- 1997-09-11 JP JP2000510534A patent/JP4155706B2/ja not_active Expired - Fee Related
- 1997-09-11 WO PCT/ES1997/000223 patent/WO1999012653A1/es active IP Right Grant
- 1997-09-11 AU AU42096/97A patent/AU754654B2/en not_active Ceased
- 1997-09-11 DE DE69732925T patent/DE69732925T2/de not_active Expired - Lifetime
- 1997-09-11 ES ES97940162T patent/ES2239786T3/es not_active Expired - Lifetime
- 1997-09-11 CA CA002303014A patent/CA2303014C/en not_active Expired - Fee Related
- 1997-09-11 US US09/508,446 patent/US6517010B1/en not_active Expired - Fee Related
- 1997-09-11 EP EP97940162A patent/EP1013344B1/en not_active Expired - Lifetime
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001030506A1 (es) * | 1999-10-28 | 2001-05-03 | Aerostar Coatings, S.L. | Pistola de proyeccion por detonacion de alta frecuencia de disparo y alta productividad |
JP2003512172A (ja) * | 1999-10-28 | 2003-04-02 | エアロスター・コーティングズ・ソシエダッド・リミターダ | 高周波パルス・レートおよび高生産性デトネーション・スプレー・ガン |
US6745951B2 (en) | 1999-10-28 | 2004-06-08 | Aerostar Coatings, S.L. | High frequency pulse rate and high productivity detonation spray gun |
AU778971B2 (en) * | 1999-10-28 | 2004-12-23 | Aerostar Coatings, S.L. | Detonation gun for projection with high frequency shooting and high productivity |
WO2004110644A1 (fr) * | 2003-05-08 | 2004-12-23 | Kadyrov, Togrul Abdulla Oglu | Installation a detonation de gaz destinee a l'application de poudres |
WO2007132028A1 (es) | 2006-05-12 | 2007-11-22 | Fundacion Inasmet | Procedimiento de obtención de recubrimientos cerámicos y recubrimientos cerámicos obtenidos |
EP2202328A1 (en) | 2008-12-26 | 2010-06-30 | Fundacion Inasmet | Process for obtaining protective coatings for high temperature with high roughness and coating obtained |
Also Published As
Publication number | Publication date |
---|---|
US6517010B1 (en) | 2003-02-11 |
AU4209697A (en) | 1999-03-29 |
CA2303014C (en) | 2007-07-10 |
EP1013344B1 (en) | 2005-03-30 |
JP2001515958A (ja) | 2001-09-25 |
EP1013344A1 (en) | 2000-06-28 |
AU754654B2 (en) | 2002-11-21 |
DE69732925T2 (de) | 2006-03-16 |
DE69732925D1 (de) | 2005-05-04 |
JP4155706B2 (ja) | 2008-09-24 |
ES2239786T3 (es) | 2005-10-01 |
DK1013344T3 (da) | 2005-06-13 |
ATE291967T1 (de) | 2005-04-15 |
CA2303014A1 (en) | 1999-03-18 |
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