CN114525464B - Spraying device based on rotatory knocking - Google Patents
Spraying device based on rotatory knocking Download PDFInfo
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- CN114525464B CN114525464B CN202210111006.0A CN202210111006A CN114525464B CN 114525464 B CN114525464 B CN 114525464B CN 202210111006 A CN202210111006 A CN 202210111006A CN 114525464 B CN114525464 B CN 114525464B
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- 238000005507 spraying Methods 0.000 title claims abstract description 64
- 238000002485 combustion reaction Methods 0.000 claims abstract description 99
- 239000000843 powder Substances 0.000 claims abstract description 91
- 239000007921 spray Substances 0.000 claims abstract description 47
- 238000005474 detonation Methods 0.000 claims abstract description 41
- 239000002737 fuel gas Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000007751 thermal spraying Methods 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 239000000446 fuel Substances 0.000 claims description 21
- 239000007800 oxidant agent Substances 0.000 claims description 18
- 230000001590 oxidative effect Effects 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010285 flame spraying Methods 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000010146 3D printing Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010289 gas flame spraying Methods 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010283 detonation spraying Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- VBUBYMVULIMEHR-UHFFFAOYSA-N propa-1,2-diene;prop-1-yne Chemical compound CC#C.C=C=C VBUBYMVULIMEHR-UHFFFAOYSA-N 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Nozzles (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention provides a spraying device based on rotary detonation. When the device works, the rotary detonation combustion chamber generates high-temperature and high-speed fuel gas, and the fuel gas is discharged from the spray pipe in an accelerating way; after the temperature of the combustion chamber is raised, the spray material powder is conveyed to a spray material conveying assembly through high-pressure air, preheated and then is converged into fuel gas, the fuel gas is further heated and accelerated, and finally, the spray material powder is discharged from a spray pipe in a molten or semi-molten state and reaches the surface of a substrate to be sprayed. Compared with the slow combustion widely used in the prior thermal spraying equipment, the rotary detonation has higher heat release rate and gas temperature, can obtain higher injection speed, and can greatly improve the spraying quality when being applied to the field of thermal spraying.
Description
Technical Field
The invention discloses a spraying device based on rotary detonation, and relates to the technical field of detonation combustion and thermal spraying.
Background
The thermal spraying technique is a technique in which a spray material is heated to a molten or semi-molten state by a heat source and is spray-deposited onto a pretreated substrate surface at a certain speed to form a coating layer, thereby imparting a special function to the substrate surface.
The types of heat sources used in thermal spraying include gas flames, electric arcs, plasma arcs, lasers, etc., wherein gas flame spraying is the earliest in application time and the widest in range. In general, fuel gas flame spraying uses a mixture of one or more fuels such as acetylene, propane, methylacetylene-propadiene, hydrogen, natural gas, etc. and combustion-supporting gas as a heat source, and the spraying material is mainly a wire-shaped, rod-shaped or powder-shaped material. The spray material is heated to melt and is sprayed onto the substrate by means of gas acceleration, so that a coating with a certain thickness is formed. The quality of the gas flame spraying depends on the melting degree and the spraying speed of the spraying material, which are respectively influenced by the action time of the gas on the spraying material and the flow rate of the gas. Among them, in the last century, 80, the us brown company initiated a supersonic flame spraying technique with the aim of increasing the spraying speed of the spray material. The core equipment of the technology is a spray gun, and generally consists of a combustion chamber, a Laval spray pipe and a constant-section long spray pipe. When the device works, ultrasonic gas can be generated, spraying powder can be fully heated and accelerated, and the highest spraying speed of the powder is about 500m/s. The supersonic flame spraying technology has the advantage of high powder spraying speed, can uniformly heat the powder, has higher quality of the formed coating, and is the most commonly used thermal spraying technology at present.
Although the ultrasonic flame spraying technology is mature, the combustion mode is traditional slow combustion, and a certain lifting space still exists for the spraying speed and the gas temperature. In the natural world, the other combustion mode, namely detonation combustion, has remarkable advantages in the aspects of improving the temperature of fuel gas and the pressure of a combustion chamber. For a fully developed detonation wave, the flow after it must be sonic or supersonic, and the gas flow velocity is much higher than that of slow combustion. In addition, detonation combustion has a self-boosting effect, with higher rates of heat release and faster available injection rates than slow combustion. At present, the detonation combustion forms comprise pulse detonation, rotary detonation and oblique detonation, compared with the pulse detonation and the oblique detonation, the rotary detonation combustion chamber has a simple structure, does not need supersonic speed incoming flow conditions, has less requirements on reactant supply, and can realize continuous propagation of detonation waves by only igniting once. In general, rotary detonation combustors are generally annular or hollow barrel structures, propellant enters from one end of the combustor, one or more detonation waves which are rotationally propagated along the circumferential direction are generated in the combustor after ignition, and combustion products are discharged from the other end at a high speed. If the rotary knocking is applied to the field of thermal spraying, the gas temperature and the spraying speed can be greatly improved, and further, a better spraying effect is obtained.
Disclosure of Invention
The invention aims to apply rotary detonation to the field of thermal spraying, and the characteristics of high detonation combustion heat release rate and high gas flow rate are utilized to improve the heating and speed increasing capability of spraying equipment on spraying materials so as to improve the coating quality.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a spray device based on rotary detonation, in particular to a spray gun using a rotary detonation combustion chamber, which comprises the rotary detonation combustion chamber, a spray material conveying assembly and a spray pipe.
The rotary detonation combustor is a main component of the spraying device and consists of a combustor outer ring, a combustor inner column, a fuel/oxidant inlet and an igniter, and is used for generating high-temperature and high-speed fuel gas required by thermal spraying.
The whole combustion chamber outer ring is barrel-shaped, the closed end of the combustion chamber outer ring is the head part of the combustion chamber, and the rest part is the outer boundary of the rotary knocking reaction area; the inner column is positioned in the combustion chamber, is a cylinder with a tail cone, is concentric with the outer ring of the combustion chamber and is arranged at the closed end of the outer ring, the outer surface of the inner column is the inner boundary of the rotary knocking reaction area, and forms an annular combustion space together with the outer ring of the combustion chamber. The diameter of the outer ring of the combustion chamber is 10-50 cm, the outer diameter of the inner column is less than 80% of the diameter of the outer ring, the length of the outer ring of the combustion chamber is 1.1-1.5 times of the diameter of the outer ring, the length of the cylindrical section of the inner column is not more than 80% of the length of the outer ring, the total length is not less than 1.2 times of the length of the outer ring, and the size can be determined according to specific spraying requirements. The fuel/oxidant inlet is located at the closed end of the outer ring of the combustion chamber for supplying the fuel and oxidant required for combustion. The fuel/oxidant inlet adopts a jet orifice circular seam collision type air inlet structure with good mixing effect in a rotary detonation supply scheme, and is characterized in that the section of the oxidant air inlet is a circular seam structure with a throat part, and oxidant enters a combustion chamber from a channel; the fuel is supplied through a plurality of injection holes uniformly distributed on the wall surface of the circular seam. The specific geometric parameters of the circumferential seam and the injection hole should meet the following conditions:
D a ＝(0.93～1)D 1
wherein D is f Is the diameter of the fuel spray holes, n is the number of the fuel spray holes, D 1 For the diameter of the combustion chamber outer ring, D a The diameter of the center circle of the circular seam is shown, and sigma is the width of the circular seam. The igniter is arranged on the outer wall surface of the combustion chamber outer ring close to the closed end forAnd (3) igniting and detonating, wherein the distance between the igniter and the closed end of the combustion chamber outer ring is 0.8-2 cm, the ignition is performed by using a tangentially-installed pre-explosion tube, and the ignition is performed by using a spark plug under the condition that the size of spraying equipment is limited.
The spray material conveying assembly consists of a spray powder inlet and a powder channel and is used for guiding the spray powder to be converged into fuel gas generated by the rotary detonation combustion chamber. The spraying powder inlet is positioned at the closed end of the combustion chamber outer ring, one end of the spraying powder inlet is connected with external powder feeding equipment, spraying powder is fed in through high-pressure air, and the other end of the spraying powder inlet is connected with the powder channel; the powder channel is positioned in the inner column of the combustion chamber, after the sprayed powder enters the channel, heat generated by rotary knocking can be conducted through the wall surface of the inner column of the combustion chamber to preheat the sprayed powder in the channel, and then the powder is gathered into fuel gas from the outlet of the channel to be heated and accelerated; in order to fully blend the spraying powder and the fuel gas, the outlet direction of the powder channel forms an included angle of 45 degrees with the axis of the inner column; the spray powder used by the spray device is the same as the conventional supersonic flame spray, the powder granularity is related to the melting point and the heat conductivity of the material, the granularity of conventional metal and alloy powder is in the range of 45-125 mu m, and the granularity of the high-temperature resistant coating powder represented by tungsten can be as low as 15-30 mu m; when the device works, the starting and stopping of the spraying powder supply are controlled by starting or closing the external powder feeding device, and the time for starting the spraying powder supply is delayed by 200-300 ms from the ignition initiation time so as to ensure that the temperature of the combustion chamber is increased.
The combustion chamber inner column is integral or split. The powder channel of the integral inner column consists of 1-12 circular section flow channels, and is obtained by 3D printing or drilling the solid inner column; the split type inner column comprises an inner column outer ring and an inner column inner core, wherein the inner diameter of the outer ring is larger than the outer diameter of the inner core, and a powder flow passage is formed in a space between the inner ring and the outer ring; the diameter of the circular powder channel or the width of the annular powder channel is larger than 4mm, and the radial distance from the outer wall surface of the inner column is 4-8 mm.
The spray pipe has the function of accelerating the combustion chamber fuel gas, the flow passage formed by the spray pipe and the inner column is in a contracted-expanded shape, the length is in the range of 0.8-1.5 times of the diameter of the outer ring of the combustion chamber, the adjustment of the length of the spray pipe can influence the flow speed of the fuel gas and the length of the spraying device, and then the outlet speed and the heating degree of spraying powder are changed.
The beneficial effects are that:
by adopting the spraying device based on rotary knocking, the slow combustion mode in conventional thermal spraying equipment is replaced by rotary knocking, so that the speed and the temperature of fuel gas can be increased under the condition of small size change of a combustion chamber, the action capability of the fuel gas on spraying powder is enhanced, the spraying speed of the powder is higher, the heating time required by melting is shorter or the melting effect under the same heating time is better, better spraying quality is further obtained, and the spraying device based on rotary knocking can be used in the field of thermal spraying.
Drawings
FIG. 1 is a schematic structural diagram of a spray coating device of the present invention and a cross-sectional view of the inner column of a rotary detonation combustor (example 1, monolithic inner column, circular powder channel).
FIG. 2 is a schematic diagram of the spray device of the present invention and a cross-sectional view of the inner column of a rotary detonation combustor (example 2, split inner column, annular powder passage).
FIG. 3 is a schematic structural diagram of a spray coating device of the present invention and a cross-sectional view of the inner column of a rotary detonation combustor (example 3, monolithic inner column, central circular powder channel).
FIG. 4 is a schematic view of the spray coating device of the present invention (example 4, no inner post, nozzle powder inlet).
Wherein, 1 is the combustion chamber outer ring, 2 is the spray tube, 3 is the fuel/oxidant import, 4 is the spraying powder import, 5 is the combustion chamber inner column, 5-1 is the combustion chamber inner column outer ring, 5-2 is the combustion chamber inner column inner core, 6 is the powder passageway, and 7 is the igniter.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
Taking fig. 1 as an example, the rotary detonation spraying device consists of a rotary detonation combustion chamber, a spraying material conveying assembly and a spray pipe, wherein the rotary detonation combustion chamber comprises a combustion chamber outer ring 1, a combustion chamber inner column 5, a fuel/oxidant inlet 3 and an igniter 7, and the combustion chamber outer ring 1 and the combustion chamber inner column 5 are used for forming an annular combustion area; the fuel/oxidant inlet 3 is used to provide the reactants required for combustion; the igniter 7 is used for igniting so as to form detonation waves; the spray material conveying assembly consists of a spray powder inlet 4 and a powder channel 6 and is used for guiding spray powder to a downstream high-temperature high-speed gas area, and heat generated by rotary knocking can be conducted through the wall surface of a column in the combustion chamber to preheat the spray powder in the channel; the lance 2 serves to accelerate the fuel gas.
In operation of the spraying device, fuel and oxidant enter the combustion chamber from the fuel/oxidant inlet 3. After the combustion chamber is filled with reactants, the ignition by the igniter 7 forms a rotary detonation wave and propagates in a circumferential rotation in the annular region between the combustion chamber outer ring 1 and the combustion chamber inner post 5. The expansion of the combustion products moves downstream and the velocity is further increased after passing through the nozzle 2. The spraying powder required by spraying is blown into the powder channel 6 from the spraying powder inlet 4 through air, the heat of the fuel gas is conducted through the inner column wall surface of the combustion chamber to preheat the spraying powder in the channel, and then the powder is converged into the fuel gas of the combustion chamber from the tail part of the inner column, is further heated and accelerated, and is finally sprayed to the preset spraying surface.
Example 1:
referring to fig. 1, the combustion chamber inner column 5 is a monolithic body, and the powder flow passage 6 includes 8 circular passages; the spray pipe 2 is a Laval spray pipe, can accelerate fuel gas, prolong the action time of the fuel gas on powder, and is beneficial to improving the powder speed and temperature.
Example 2:
referring to fig. 2, the combustion chamber inner column is divided into an outer ring 5-1 and an inner core 5-2, and a powder channel 6 is arranged between the outer ring and the inner core, so that the design can obtain larger flow passage cross section area under the same inner column size; the nozzle 2 is a laval nozzle, compared with the embodiment 1, the axial length of the device is shortened, the acting time of fuel gas on powder is shortened, and the speed and the temperature of the powder can be adjusted.
Example 3:
referring to fig. 3, the powder passage 6 is located at the center of the column 5 in the combustion chamber and is a circular straight passage, so that collision, deceleration and accumulation of the spray powder in the powder passage can be avoided, but the preheating effect of the heat of the fuel gas on the spray powder is weakened, compared with the powder passages with deflection angles in examples 1 and 2; the diameter of the inner post 5 is reduced, namely the width of the rotary detonation combustion chamber is increased, and the stable working range of rotary detonation can be widened.
Example 4:
referring to fig. 4, the inner column of the combustion chamber and the powder channel are omitted, the rotary detonation combustion chamber is changed into a hollow barrel shape, according to experimental study, under the condition that other conditions are unchanged, the mixing effect of fuel and oxidant in the hollow barrel-shaped combustion chamber is better than that of the annular combustion chamber, and a wider stable working range can be obtained; the spray powder inlet 4 is located at a position behind the throat of the nozzle 2, whereby the coating powder is introduced into the combustion gas, which modification simplifies the spray material delivery and improves the stability and reliability of the spray powder supply.
The present invention is not limited to the above embodiments, and various modifications and optimization can be made to the above-described method by those skilled in the art without departing from the basic inventive concept.
Claims (1)
1. The spraying equipment based on the rotary detonation comprises a rotary detonation combustion chamber, a spraying material conveying assembly and a spray pipe, and is characterized in that the spraying powder is heated and accelerated by utilizing fuel gas generated by the rotary detonation combustion chamber, and finally the powder is discharged from the spray pipe in a molten or semi-molten state at a high speed and reaches the surface of a substrate to be sprayed to form a coating with a certain thickness;
the rotary knocking combustion chamber is a main component of the spraying device and consists of a combustion chamber outer ring, a combustion chamber inner column, a fuel/oxidant inlet and an igniter, and is used for generating high-temperature high-speed fuel gas required by thermal spraying; the whole combustion chamber outer ring is barrel-shaped, the closed end of the combustion chamber outer ring is the head part of the combustion chamber, and the rest part is the outer boundary of the rotary knocking reaction area; the inner column is positioned in the combustion chamber, is a cylinder with a tail cone, is concentric with the outer ring of the combustion chamber and is arranged at the closed end of the outer ring, the outer surface of the inner column is the inner boundary of a rotary knocking reaction area, and forms an annular combustion space together with the outer ring of the combustion chamber; the diameter of the outer ring of the combustion chamber is 10-50 cm, the outer diameter of the inner column is less than 80% of the diameter of the outer ring, the length of the outer ring of the combustion chamber is 1.1-1.5 times of the diameter of the outer ring, the length of the cylindrical section of the inner column is not more than 80% of the length of the outer ring, and the total length is not less than 1.2 times of the length of the outer ring; the fuel/oxidant inlet is positioned at the closed end of the outer ring of the combustion chamber and is used for supplying fuel and oxidant required for combustion; the fuel/oxidant inlet adopts a jet orifice circular seam collision type air inlet structure with good mixing effect in a rotary detonation supply scheme, and is characterized in that the section of the oxidant air inlet is a circular seam structure with a throat part, and oxidant enters a combustion chamber from a channel; the fuel is supplied through a plurality of injection holes uniformly distributed on the wall surface of the circular seam; the specific geometric parameters of the circumferential seam and the injection hole should meet the following conditions:
D a ＝(0.93～1)D 1
wherein D is f Is the diameter of the fuel spray holes, n is the number of the fuel spray holes, D 1 For the diameter of the combustion chamber outer ring, D a The diameter of the center circle of the circular seam is the width of the circular seam; the igniter is arranged on the outer wall surface of the outer ring of the combustion chamber close to the closed end and used for ignition initiation, the distance between the igniter and the closed end of the outer ring of the combustion chamber is 0.8-2 cm, the igniter is ignited by using a tangentially arranged pre-explosion tube, and the igniter is ignited by using a spark plug under the condition that the size of spraying equipment is limited;
the spraying material conveying component consists of a spraying powder inlet and a powder channel and is used for guiding spraying powder to be converged into fuel gas generated by the rotary detonation combustion chamber, and the type of the spraying powder is the same as that of the conventional supersonic flame spraying; the spraying powder inlet is positioned at the closed end of the combustion chamber outer ring, one end of the spraying powder inlet is connected with external powder feeding equipment, spraying powder is fed in through high-pressure air, and the other end of the spraying powder inlet is connected with the powder channel; the powder channel is positioned in the inner column of the combustion chamber, after the sprayed powder enters the channel, heat generated by rotary knocking can be conducted through the wall surface of the inner column of the combustion chamber to preheat the sprayed powder in the channel, and then the powder is gathered into fuel gas from the tail end of the channel for further heating and accelerating; in order to fully blend the spraying powder and the fuel gas, the outlet direction of the powder channel forms an included angle of 45 degrees with the axis of the inner column; when the device works, the external powder feeding equipment is started or closed to control the start and stop of the supply of the spraying powder, and the time for starting the supply of the spraying powder is delayed by 200-300 ms after the ignition initiation time;
the combustion chamber inner column is integrated or split, a powder runner of the integrated inner column consists of 1-12 circular section runners, and is obtained by 3D printing or drilling the solid inner column; the split type inner column comprises an inner column outer ring and an inner column inner core, wherein the inner diameter of the outer ring is larger than the outer diameter of the inner core, and a powder flow passage is formed in a space between the inner ring and the outer ring; the diameter of the circular powder channel or the width of the circular powder channel is larger than 4mm, and the radial distance from the outer wall surface of the inner column is 4-8 mm;
the spray pipe has the function of accelerating the combustion chamber fuel gas, the flow passage formed by the spray pipe and the inner column is in a contracted-expanded shape, the length is in the range of 0.8-1.5 times of the diameter of the outer ring of the combustion chamber, the adjustment of the length of the spray pipe can influence the flow speed of the fuel gas and the length of the spraying device, and then the outlet speed and the heating degree of spraying powder are changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210111006.0A CN114525464B (en) | 2022-01-22 | 2022-01-22 | Spraying device based on rotatory knocking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210111006.0A CN114525464B (en) | 2022-01-22 | 2022-01-22 | Spraying device based on rotatory knocking |
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| CN114525464B true CN114525464B (en) | 2024-01-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116026130B (en) * | 2023-03-28 | 2023-06-02 | 清华大学 | Drying device |
| CN117722293B (en) * | 2024-02-18 | 2024-04-30 | 中国人民解放军战略支援部队航天工程大学 | Conical continuous rotary detonation space rail-controlled engine |
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| US5019686A (en) * | 1988-09-20 | 1991-05-28 | Alloy Metals, Inc. | High-velocity flame spray apparatus and method of forming materials |
| CN101181703A (en) * | 2007-12-14 | 2008-05-21 | 安东石油技术（集团）有限公司 | Powder flame-thrower nozzle |
| CN101736277A (en) * | 2008-11-14 | 2010-06-16 | 中国农业机械化科学研究院 | Flame sprayer |
| CN104561879A (en) * | 2014-11-25 | 2015-04-29 | 西北工业大学 | Device for exploding and spraying liquid fuels |
| CN112126887A (en) * | 2020-09-14 | 2020-12-25 | 水利部杭州机械设计研究所 | Novel air gas type supersonic flame spray gun, spraying device and method for preparing metal ceramic coating |
| CN113513429A (en) * | 2021-04-16 | 2021-10-19 | 中国人民解放军战略支援部队航天工程大学 | Engine and method capable of realizing tangential unstable combustion and continuous rotation detonation |
-
2022
- 2022-01-22 CN CN202210111006.0A patent/CN114525464B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5019686A (en) * | 1988-09-20 | 1991-05-28 | Alloy Metals, Inc. | High-velocity flame spray apparatus and method of forming materials |
| CN101181703A (en) * | 2007-12-14 | 2008-05-21 | 安东石油技术（集团）有限公司 | Powder flame-thrower nozzle |
| CN101736277A (en) * | 2008-11-14 | 2010-06-16 | 中国农业机械化科学研究院 | Flame sprayer |
| CN104561879A (en) * | 2014-11-25 | 2015-04-29 | 西北工业大学 | Device for exploding and spraying liquid fuels |
| CN112126887A (en) * | 2020-09-14 | 2020-12-25 | 水利部杭州机械设计研究所 | Novel air gas type supersonic flame spray gun, spraying device and method for preparing metal ceramic coating |
| CN113513429A (en) * | 2021-04-16 | 2021-10-19 | 中国人民解放军战略支援部队航天工程大学 | Engine and method capable of realizing tangential unstable combustion and continuous rotation detonation |
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| CN114525464A (en) | 2022-05-24 |
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