CN108757203A - The dual ignition plug cylinder head assembly and aero-engine of heavy fuel burning engine - Google Patents
The dual ignition plug cylinder head assembly and aero-engine of heavy fuel burning engine Download PDFInfo
- Publication number
- CN108757203A CN108757203A CN201810534902.1A CN201810534902A CN108757203A CN 108757203 A CN108757203 A CN 108757203A CN 201810534902 A CN201810534902 A CN 201810534902A CN 108757203 A CN108757203 A CN 108757203A
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- China
- Prior art keywords
- cylinder head
- engine
- spark plug
- plug
- head assembly
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 31
- 230000009977 dual effect Effects 0.000 title claims abstract description 26
- 239000000295 fuel oil Substances 0.000 claims abstract description 49
- 230000000712 assembly Effects 0.000 claims abstract description 7
- 238000000429 assembly Methods 0.000 claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims description 31
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000000889 atomisation Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000567 combustion gas Substances 0.000 description 4
- 230000008450 motivation Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/242—Arrangement of spark plugs or injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The invention discloses the dual ignition plug cylinder head assemblies and aero-engine of a kind of heavy fuel burning engine, including cylinder head, the dual ignition plug formed by spark plug I and spark plug II is installed on the cylinder head, the present invention has higher ignition energy, especially coordinate to be fully atomized and astatki after evenly mixing, heavy oil is enabled to realize more adequately efficient tissue burning, conducive to the efficient burning of heavy oil, ensure engine various operating modes and under the conditions of reliable and secure igniting, relative to traditional heavy oil compression ignition engine, further decrease engine volume and weight, it is suitable for unmanned plane use, it can more embody efficiently, the characteristic of environmental protection.
Description
Technical field
The present invention relates to engine and application, more particularly to the dual ignition plug cylinder head assembly of a kind of heavy fuel burning engine and aviation
Engine.
Background technology
Fuel of the heavy oil as engine, will be as the power trend of small and medium size unmanned aerial vehicles；But heavy oil viscosity is high, low temperature stream
Dynamic property is poor, causes atomizing effect poorer than common light oil, affects combustion efficiency, even result in engine start difficulty with
And discharge is not up to standard.
In the prior art, in order to ensure that heavy fuel burning engine can have good atomization and startup, have and use carburetion
The fuel system such as device+auxiliary preheating technology, mechanical injection (fuel direct injection), electronic fuel injection；Traditional heavy fuel burning engine base
This uses the combustion system of compression ignition, needs cylinder body to bear larger pressure, to increase the overall weight of cylinder body, bulky totality
It can not be suitable for the Miniature Vehicles such as unmanned plane machinery；Meanwhile the efficient burning of heavy oil is cannot achieve, it also allows for heavy oil and answers
The effect of expectation is unable to reach for the dynamic property, economy and emission performance of engine, to make the application of heavy oil can not big model
It encloses universal.
Therefore, it is necessary to be improved to existing heavy fuel burning engine, heavy oil is enabled to realize more adequately efficient
Tissue burning, mitigates the overall weight of heavy fuel burning engine, ensures heavy oil in the dynamic property, economy and discharge applied to engine
Property, it realizes the energy-saving and environmental protection after heavy oil is applied to engine and low cost, is suitable for the Miniature Vehicles such as unmanned plane machinery.
Invention content
In view of this, the object of the present invention is to provide a kind of dual ignition plug cylinder head assembly of heavy fuel burning engine and aviation weights
Oil turbine has higher ignition energy, enables to heavy oil to realize more adequately efficient tissue burning, mitigates heavy oil
The overall weight of engine ensures that heavy oil in the dynamic property, economy and emission performance applied to engine, realizes that heavy oil is applied to
Energy-saving and environmental protection after engine and low cost are suitable for the Miniature Vehicles such as unmanned plane machinery.
The dual ignition plug cylinder head assembly of the heavy fuel burning engine of the present invention, including cylinder head, installation is by spark plug I on the cylinder head
The dual ignition plug formed with spark plug II；Ignition energy is greatly improved, is conducive to the efficient burning of heavy oil, especially coordinates with abundant
Atomization and astatki after evenly mixing, ensure engine various operating modes and under the conditions of reliable and secure igniting, relative to
Traditional heavy oil compression ignition engine, further decreases engine volume and weight, is suitable for unmanned plane use, can more embody
Efficiently, environmentally friendly characteristic.
Further, precombustion chamber is also machined on the cylinder head, the precombustion chamber is along plug ignition direction
The jet port of Laval nozzle structure, the Laval nozzle structure is connected to combustion chamber；The precombustion chamber course of work is to mix
After fuel is injected into combustion chamber, while entering precombustion chamber, (ignition point is located at the inlet end of Laval nozzle, should by spark plug
Inlet end be for Laval nozzle, rather than with the mouth of combustion chamber) igniting after, expand simultaneously sprayed by Lavalle
Pipe rapidly sprays (speed more higher than combustion explosion), and the fuel combination to entering combustion chamber, which further impacts to have, makes gas fill
Divide mixed effect, conducive to uniform combustion mixture is formed, meanwhile, precombustion chamber can accelerate flame transmission, improve burning
Efficiency promotes engine power and reduces risk for knock, additionally it is possible to organize the burning of fuel-efficient, ensure heavy oil applied to hair
Dynamic property, economy and the emission performance of motivation realize the energy-saving and environmental protection after heavy oil is applied to engine and low cost.
Further, the spark plug I be located at top of combustion chamber centre position or near, precombustion chamber is set to spark plug
At I and I ignitor of the spark plug stretches into precombustion chamber；Main spark plug is in the middle part of combustion chamber or nearby, precombustion chamber sprays
The burning gases gone out are more conducive to the mixed Daqu disturbance to entire combustion chamber and fully burning.
Further, further include for the fuel oil ejection assemblies to combustion chamber inner direct fuel oil；The structure of in-cylinder direct-jet
It is higher after being formed after ensureing that later stage direct-injection enters combustion chamber and being more more fully atomized in conjunction with twin ignition scheme
Ignition energy is conducive to realize the abundant burning of heavy oil and utilization.
Further, the fuel oil ejection assemblies are respectively in I both sides of spark plug with spark plug II；The oil-air mixing nozzle
Injection direction is 16 ° -20 °；The igniting angle of spark plug II is 40 ° -50 °；The structure makes the gaseous mixture that in-cylinder direct-jet enters
It is corresponding with the igniting orientation of spark plug, it is formed about dense combustion gas mixing area in spark plug, is further mixed conducive to burning air
It closes, to organize the burning of fuel-efficient；The injection direction of oil-air mixing nozzle be suitable in heavy oil atomization property and
The sparking mode for adapting to dual ignition plug is fully burnt conducive to tissue igniting and final obtain.
Further, the spark plug I be located at top of combustion chamber centre position or near；The center line of the spark plug I,
The center line of spark plug II and the center line of oil-air mixing nozzle are substantially coplanar, and the coplanar plane with where inlet and exhaust valve exists
Spatially substantially vertical, it is same that co-planar arrangement refers to that the central axis of oil-air mixing nozzle, spark plug II and spark plug I is located at
On face, the plane where inlet and outlet door refers to that the axis of inlet and exhaust valve is generally aligned in the same plane, substantially coplanar and substantially vertical be
Refer to the error for allowing to have certain, such as smaller inclination and dislocation, has no effect on understanding coplanar to this programme and vertical；
The structure ensure that the simple-arranged of all parts on cylinder head, while being sufficiently mixed conducive to air inlet and combustion gas, be conducive to form rolling
It flows and is further atomized, ensure that the burning of uniform high-efficiency.
The invention also discloses a kind of heavy oil aero-engine, the heavy oil aero-engine is equipped with the heavy oil hair
The dual ignition plug cylinder head assembly of motivation.
Beneficial effects of the present invention：The dual ignition plug cylinder head assembly and aero-engine of the heavy fuel burning engine of the present invention, tool
There is higher ignition energy, especially coordinates to be fully atomized and astatki after evenly mixing, heavy oil is enabled to realize
More adequately efficient tissue burning, is conducive to the efficient burning of heavy oil, ensure engine various operating modes and under the conditions of reliably
The igniting of safety further decreases engine volume and weight, is suitable for nobody relative to traditional heavy oil compression ignition engine
Machine uses, and can more embody efficient, environmentally friendly characteristic.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is that the cylinder head assembly of the present invention is installed on engine structure schematic diagram.
Specific implementation mode
As shown in the figure：The dual ignition plug cylinder head assembly of the heavy fuel burning engine of the present embodiment, including cylinder head 2, on the cylinder head
The dual ignition plug formed by spark plug I 3 and spark plug II 4 is installed；Ignition energy is greatly improved, the efficient burning of heavy oil is conducive to,
Especially coordinate to be fully atomized and astatki after evenly mixing, ensure engine various operating modes and under the conditions of reliably pacify
Full igniting further decreases engine volume and weight, is suitable for unmanned plane relative to traditional heavy oil compression ignition engine
It uses, can more embody efficient, environmentally friendly characteristic.
In the present embodiment, precombustion chamber 17 is also machined on the cylinder head, the precombustion chamber 17 is along spark plug point
The Laval nozzle structure of fiery direction (referring to spark plug axis direction) is formed, and the jet port of the Laval nozzle structure connects
Logical combustion chamber；The precombustion chamber course of work is, after fuel combination is injected into combustion chamber, while entering precombustion chamber, by spark
(ignition point is located at the inlet end of Laval nozzle to plug, which is rather than the and combustion chamber for Laval nozzle
The mouth of connection) igniting after, expand simultaneously by Laval nozzle rapidly by throat by Laval nozzle jet port spray (than fire
Decrepitate fries higher speed), the fuel combination to entering combustion chamber, which further impacts to have, makes the well-mixed effect of gas, profit
In the uniform combustion mixture of formation, meanwhile, precombustion chamber can accelerate flame transmission, improve efficiency of combustion, promote engine
Power simultaneously reduces risk for knock, additionally it is possible to organize the burning of fuel-efficient, ensure heavy oil in the dynamic property applied to engine, warp
Ji property and emission performance realize the energy-saving and environmental protection after heavy oil is applied to engine and low cost.
In the present embodiment, precombustion chamber is set at spark plug I 3 and I 3 ignitor of the spark plug stretches into precombustion
Room；Main spark plug is in the middle part of combustion chamber or nearby, the burning gases that precombustion chamber sprays more conducively mix entire combustion chamber
It closes gas and forms disturbance and fully burning.
In use, fuel oil ejection assemblies a is also installed on cylinder head, as shown, the fuel oil ejection assemblies a includes fuel oil spray
Mouth 6, premixer 7 and oil-air mixing nozzle 8 are realized premix and the fuel oil that further atomizing fuel nozzle sprays in premixer, are protected
Card later stage direct-injection, which enters behind combustion chamber to be formed, to be more more fully atomized, to realize the abundant burning of heavy oil and utilize；It is this
Premix atomization not only ensure that the further mist of fuel droplet different from the impact atomization of the simple pressure air of the prior art
Change, moreover it is possible to ensure between auxiliary air and droplet it is uniform mix, into combustion chamber after being capable of homogenous combustion；In conjunction with dual ignition plug
High-energy ignition characteristic so that heavy oil can fully burn.
As shown, the piston of piston component 5 is installed on cylinder body 1, installation is by spark plug I 3 and spark plug II 4 on cylinder head 2
The dual ignition plug of formation, the mounting structure of spark plug are to stretch into combustion chamber to light a fire, and details are not described herein for mounting structure, uses
Dual ignition plug provides igniting, the characteristic with high-energy ignition, in conjunction with air-assisted atomization above-mentioned and premix scheme, ensures hair
Motivation various operating modes and under the conditions of reliable and secure igniting further decreased relative to traditional heavy oil compression ignition engine
Engine volume and weight is suitable for unmanned plane use.
In the present embodiment, (fuel oil ejection assemblies a) is respectively in spark plug I 3 to the oil-air mixing nozzle 8 with spark plug II 4
The injection direction of both sides, the oil-air mixing nozzle is 16 ° -20 °, preferably 18 °；The igniting angle of spark plug II is 40 ° -50 °,
It is preferred that 45 °, igniting angle refers to the angle of the axis direction of spark plug；What angle here referred to is all the folder with cylinder center line
Angle, details are not described herein；The structure makes the gaseous mixture that in-cylinder direct-jet enters after top land and cylinder body wall surface water conservancy diversion, with fire
The igniting orientation of Hua Sai is corresponding, is formed about dense combustion gas mixing area in spark plug, and further mix conducive to burning air,
To form efficient tissue burning；The injection direction of oil-air mixing nozzle is suitable in the atomization property of heavy oil and adaptation
The sparking mode of dual ignition plug is fully burnt conducive to tissue igniting and final obtain.
In the present embodiment, the spark plug I 3 be located at top of combustion chamber centre position or near, due to I 3, spark plug
In centre position or near, the structure ensure that spark plug II 4 and 8 structure of oil-air mixing nozzle arrangement on also is located at center line, spray
It is conducive to be sufficiently mixed and adequately burn after penetrating and lighting a fire.
In the present embodiment, in the center line of the spark plug I 3, the center line and oil-air mixing nozzle 8 of spark plug II 4
Heart line is substantially coplanar, and the plane where the coplanar door with inlet and outlet is spatially substantially vertical, and co-planar arrangement refers to oil gas
The central axis of mixing nozzle 8, spark plug II 4 and spark plug I 3 is located on the same face, and the plane where inlet and outlet door refers to
The axis of inlet and exhaust valve is generally aligned in the same plane, it is substantially coplanar and it is substantially vertical refer to the error for allowing to have certain, such as it is smaller
Inclination and dislocation, have no effect on understanding coplanar to this programme and vertical；The structure ensure that all parts on cylinder head
Simple-arranged, while being sufficiently mixed conducive to air inlet and combustion gas, are further atomized conducive to tumble flow is formed, ensure that uniform high-efficiency
Burning.
The invention also discloses a kind of heavy oil aero-engine, the heavy oil aero-engine is equipped with the heavy oil hair
The dual ignition plug cylinder head assembly of motivation, as shown, the piston for further including piston component 5 is installed on cylinder body 1, which is applicable in
In aircraft (nobody is manned).
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with
Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the right of invention.
Claims (7)
1. a kind of dual ignition plug cylinder head assembly of heavy fuel burning engine, it is characterised in that：Including cylinder head, installation is by fire on the cylinder head
The dual ignition plug that flower plug I and spark plug II are formed.
2. the dual ignition plug cylinder head assembly of heavy fuel burning engine according to claim 1, it is characterised in that：On the cylinder head also
It is machined with precombustion chamber, the precombustion chamber is the Laval nozzle structure along plug ignition direction, the Lavalle spray
The jet port of pipe structure is connected to combustion chamber.
3. the dual ignition plug cylinder head assembly of heavy fuel burning engine according to claim 2, it is characterised in that：The spark plug I
Positioned at the centre position of top of combustion chamber or near, precombustion chamber is set at spark plug I and I ignitor of the spark plug is stretched
Enter precombustion chamber.
4. the dual ignition plug cylinder head assembly of heavy fuel burning engine according to claim 1, it is characterised in that：Further include for
The fuel oil ejection assemblies of combustion chamber inner direct fuel oil.
5. the dual ignition plug cylinder head assembly of heavy fuel burning engine according to claim 4, it is characterised in that：The fuel oil injection
Component is respectively in I both sides of spark plug with spark plug II；The injection direction of the oil-air mixing nozzle is 16 ° -20 °；Spark plug II
Igniting angle be 40 ° -50 °.
6. the dual ignition plug cylinder head assembly of heavy fuel burning engine according to claim 5, it is characterised in that：The spark plug I
Positioned at the centre position of top of combustion chamber or near；The center line of the spark plug I, the center line and air-fuel mixture of spark plug II
The center line of nozzle is substantially coplanar, and the plane where the coplanar door with inlet and outlet is spatially substantially vertical.
7. a kind of Heavy End Aviation Fuel engine, it is characterised in that：The engine is equipped with claim 1 to 6 any claim
Heavy fuel burning engine dual ignition plug cylinder head assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810534902.1A CN108757203A (en) | 2018-05-29 | 2018-05-29 | The dual ignition plug cylinder head assembly and aero-engine of heavy fuel burning engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810534902.1A CN108757203A (en) | 2018-05-29 | 2018-05-29 | The dual ignition plug cylinder head assembly and aero-engine of heavy fuel burning engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108757203A true CN108757203A (en) | 2018-11-06 |
Family
ID=64003765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810534902.1A Pending CN108757203A (en) | 2018-05-29 | 2018-05-29 | The dual ignition plug cylinder head assembly and aero-engine of heavy fuel burning engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108757203A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113909016A (en) * | 2021-11-03 | 2022-01-11 | 水利部杭州机械设计研究所 | Multi-combustion-chamber high-power high-efficiency supersonic flame thermal spraying spray gun and thermal spraying device thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058910A (en) * | 1979-09-06 | 1981-04-15 | Fiat Auto Spa | Spark-ignition internal combustion engine adapted to operate with lean mixtures |
| DE4123592A1 (en) * | 1991-07-17 | 1993-01-21 | Daimler Benz Ag | Improved burn IC engine with two spark plugs - uses staggered ignition for enhanced compression of fuel-air mixture in main combustion chamber |
| JP2001193465A (en) * | 2000-01-17 | 2001-07-17 | Mitsubishi Heavy Ind Ltd | Diesel engine |
| US20040079322A1 (en) * | 2002-10-29 | 2004-04-29 | Hitachi, Ltd. | Control apparatus for internal combustion engine and control method for internal combustion engine combustion method for internal combustion engine and direct injection engine |
| CN2893176Y (en) * | 2006-02-06 | 2007-04-25 | 王雪松 | Contracting and expanding spray tube precombustion chamber separating combustion chamber diesel internal combustion engine |
| JP2008151000A (en) * | 2006-12-15 | 2008-07-03 | Toyota Motor Corp | Internal combustion engine |
| CN106762127A (en) * | 2017-02-09 | 2017-05-31 | 天津内燃机研究所（天津摩托车技术中心） | Two-stroke in-cylinder direct fuel-injection engine |
| CN208763763U (en) * | 2018-05-29 | 2019-04-19 | 重庆隆鑫发动机有限公司 | The dual ignition plug cylinder head assembly and aero-engine of heavy fuel burning engine |
-
2018
- 2018-05-29 CN CN201810534902.1A patent/CN108757203A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058910A (en) * | 1979-09-06 | 1981-04-15 | Fiat Auto Spa | Spark-ignition internal combustion engine adapted to operate with lean mixtures |
| DE4123592A1 (en) * | 1991-07-17 | 1993-01-21 | Daimler Benz Ag | Improved burn IC engine with two spark plugs - uses staggered ignition for enhanced compression of fuel-air mixture in main combustion chamber |
| JP2001193465A (en) * | 2000-01-17 | 2001-07-17 | Mitsubishi Heavy Ind Ltd | Diesel engine |
| US20040079322A1 (en) * | 2002-10-29 | 2004-04-29 | Hitachi, Ltd. | Control apparatus for internal combustion engine and control method for internal combustion engine combustion method for internal combustion engine and direct injection engine |
| CN2893176Y (en) * | 2006-02-06 | 2007-04-25 | 王雪松 | Contracting and expanding spray tube precombustion chamber separating combustion chamber diesel internal combustion engine |
| JP2008151000A (en) * | 2006-12-15 | 2008-07-03 | Toyota Motor Corp | Internal combustion engine |
| CN106762127A (en) * | 2017-02-09 | 2017-05-31 | 天津内燃机研究所（天津摩托车技术中心） | Two-stroke in-cylinder direct fuel-injection engine |
| CN208763763U (en) * | 2018-05-29 | 2019-04-19 | 重庆隆鑫发动机有限公司 | The dual ignition plug cylinder head assembly and aero-engine of heavy fuel burning engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113909016A (en) * | 2021-11-03 | 2022-01-11 | 水利部杭州机械设计研究所 | Multi-combustion-chamber high-power high-efficiency supersonic flame thermal spraying spray gun and thermal spraying device thereof |
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