JPS6145496B2 - - Google Patents
Info
- Publication number
- JPS6145496B2 JPS6145496B2 JP1944679A JP1944679A JPS6145496B2 JP S6145496 B2 JPS6145496 B2 JP S6145496B2 JP 1944679 A JP1944679 A JP 1944679A JP 1944679 A JP1944679 A JP 1944679A JP S6145496 B2 JPS6145496 B2 JP S6145496B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- premixing
- combustion chamber
- gas
- supply hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 claims description 30
- 239000000843 powder Substances 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 20
- 238000007751 thermal spraying Methods 0.000 claims description 8
- 238000009751 slip forming Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 34
- 239000002994 raw material Substances 0.000 description 13
- 239000002737 fuel gas Substances 0.000 description 9
- 230000008018 melting Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
Landscapes
- Nozzles (AREA)
Description
この発明は火炎溶射に用いる粉体溶射用バーナ
ーノズルに関する。
従来の粉体溶射装置では燃料ガスとして
O3H8，O4H10等のガスを用いた場合に充分に高い
火炎温度が得られず、セラミツクたとえばＡ
2O3のような高融点の粉体原料を火炎溶射するこ
とができなかつた。そこで、高融点の粉体原料を
火炎溶射する場合には、一般に燃料ガスとして
C2H2を用いていた。しかし、C2H2は自己分解を
起す性質を有するため供給圧力を低く保つ必要が
あり、大容量処理には不向きである。
この発明はこのような事情を考慮してなされた
ものであり、その目的は燃料ガスとしてC3H8，
C4H10等を用いても充分に高い火炎温度を得るこ
とができ、セラミツク等高融点の粉体材料を火炎
溶射できる粉体溶射用のバーナーノズルを提供す
ることにある。さらに、この発明の他の目的は粉
体原料を高い溶着率で火炎溶射できるバーナーノ
ズルを提供することにある。
以下、この発明の一実施例について説明する。
第１図および第２図はこの実施例の粉体溶射用バ
ーナーノズルの本体９を示している。第１図およ
び第２図において、このバーナーノズル本体９は
内筒１０および外筒１１からなつている。内筒１
０は銅製の第１内筒部材１２および銅製の第２内
筒部材１３からなつている。この第１、第２内筒
部材１２，１３は後述する第１予混合・燃焼室１
４、第２予混合・燃焼室１５、気固流供給孔１
６、支燃ガス案内孔１７、複数個（この実施例で
は８個）の第１支燃ガス供給孔１８、…および第
２支燃ガス供給孔１９を形成している。
外筒１１および第１内筒部材１２は円筒形であ
り、第２内筒部材１３もほぼ円筒形である。これ
ら外筒１１、第１内筒部材１２および第２内筒部
材１３は同軸の配置で設けられており、外筒１１
は第１内筒部材１２を被い囲むように設けられて
いる。そして、第２内筒部材１３は第１内筒部材
１２よりも小径であり、第１内筒部材１２内に固
定して設けられている。
第１内筒部材１２の一端は火炎噴出口１２ａと
して開口されている。第２内筒部材１３のこの火
炎噴出口１２ａ側の端面１３ａはこの火炎噴出口
１２ａより所定長さだけ退いている。その結果、
第１内筒部材１２および第２内筒部材１３の端面
１３ａによつて円柱状の空洞の第２予混合・燃焼
室１５が形成されている。第２内筒部材１３の端
面１３ａには円形の開口１４ａが設けられてお
り、第２内筒部材１３にはこの開口１４ａに連続
するほぼ円錐台型状の空洞の第１予混合・燃焼室
１４が設けられている。この第１予混合・燃焼室
１４の頂部（開口１４ａの反対側）には円柱状の
空洞の気固流供給孔１６が連続するように設けら
れている。
こうして、気固流（粉体原料たとえばＡ2O3
をC3H8，C4H10等の燃料ガスたとえばC2H8で輸
送する流れ。以下、同様）が気固流供給孔１６を
介して第１予混合・燃焼室１４および第２予混
合・燃焼室１５へと順次導入されている。そのの
ち火炎とされて火炎噴出口１２ａから噴射される
のである。
第２内筒部材１３の外径は第１予混合・燃焼室
１４側において第１内筒部材１２の内径よりわず
かに小さくなつている。その結果、ここにおいて
環状のスリツトからなる第２支燃ガス供給孔１９
が形成されている。他方、気固流供給孔１６側に
おいて第２内筒部材１３の外径は第１内筒部材１
２の内径より大分小さくなつており、その結果、
ここにおいて環状の支燃ガス案内孔１７が形成さ
れている。
さらに、第２内筒部材１３には第１予混合・燃
焼室１４および支燃ガス案内孔１７の間を連通す
る第１支燃ガス供給孔１８，…が形成されてい
る。これら第１支燃ガス供給孔１８，…は第１予
混合・燃焼室１４の錐面状の壁面に環状の配列に
なるように、かつほぼ第１予混合・燃焼室１４の
開口１４ａの方向でバーナー本体の軸線上に収れ
んするように穿ち設けられている。
こうして、酸素ガスまたは酸素富化空気（以
下、支燃ガスとする）が支燃ガス案内孔１７を経
たのち第１支燃ガス供給孔１８，…および第２支
燃ガス供給孔１９によつてそれぞれ第１、第２予
混合・燃焼室１４，１５に供給され、前述の気固
流と混合される。
つぎに、このように構成された粉体溶射用バー
ナーノズルの機能について説明する。第１図およ
び第２図において、粉体原料Ａ2O3は燃料ガス
C3H8に輸送されて気固流として約20ｍ／secの流
速で矢印ａに示すように気固流供給孔１６内を案
内される。また、支燃ガスは支燃ガス案内孔１７
内を約20ｍ／secの流速で矢印ｂに示すように案
内され、そののち第１支燃ガス供給孔１８，…お
よび第２支燃ガス供給孔１９を経て約150ｍ／sec
の流速で矢印ｃ，ｄでそれぞれ示すように第１、
第２予混合・燃焼室１４，１５に噴出される。そ
の結果、燃料ガスおよび支燃ガスが混合される。
すなわち、第１支燃ガス供給孔１８，…は第１
予混合・燃焼室１４に連通され、第２支燃ガス供
給孔１９は第２予混合・燃焼室１５に連通されて
いるため、前述の気固流はまず供給孔１８，…の
近くを通過し、そののち供給孔１９の近くを通過
していく。その結果、この気固流にはまず供給孔
１８，…から噴出された支燃ガスが混合され、そ
ののち供給孔１９から噴出された支燃ガスが混合
される。この際、各支燃ガス供給孔１８，…１９
は火炎噴出口１２ａ（開口１４ａ）方向を向いて
いるため、前述の支燃ガスの噴出によつて、気固
流供給孔１６からの気固流のスムーズな供給が妨
げられ流れが乱されるということがない。
こうして、気固流がスムーズに供給され、その
うえ、この気固流に支燃ガスが完全に混合され
る。したがつて、第１、第２予混合・燃焼室１
４，１５から火炎噴出口１２ａの外側の領域にわ
たつて高い火炎温度ゾーンが形成され、気固流中
の粉体原料が高融点のものであつても、火炎噴出
口１２ａの外側の領域までに完全に溶融される。
火炎噴出口１２ａから噴出されるガス（火炎）の
流速はほぼ250ｍ／secであり、大部分が溶融され
た粉体原料の流速（速度）はほぼ150ｍ／secであ
る。粉体原料はこの流速で火炎噴出口１２ａを噴
出し火炎中で完全に溶融した後母材（図示しな
い）に溶着する。
また、第１支燃ガス供給孔１８，…は第１予混
合・燃焼室１４の錐面に環状の配列で、しかも開
口１４ａ（火炎噴出口１２ａ）の方向に向いて設
けられている。さらに、第２支燃ガス供給孔１９
は環状のスリツトからなり、かつ火炎噴出口１２
ａの方向に向いている。したがつて、気固流中の
粉体原料がむだに飛散しないですみ、気固流中の
粉体原料を前述した火炎の中心（第１、第２予混
合・燃焼室１４，１５の中心軸方向）に集中させ
ることができ、そのため高溶着率の溶射を実現で
きる。上記ノズルを用いた溶射実験によれば、
「表」に示すように、燃料ガスおよび粉体原料と
してそれぞれC3H8およびＡ2O3（純粋）を採用
した場合でも極めて高い溶着率で蓉射が行えた。
The present invention relates to a burner nozzle for powder thermal spraying used in flame thermal spraying. In conventional powder spray equipment, it is used as fuel gas.
When using gases such as O 3 H 8 and O 4 H 10 , a sufficiently high flame temperature cannot be obtained, and ceramics such as A
It was not possible to flame spray a powder material with a high melting point such as 2 O 3 . Therefore, when flame spraying a powder raw material with a high melting point, it is generally used as a fuel gas.
C 2 H 2 was used. However, since C 2 H 2 has the property of causing self-decomposition, it is necessary to keep the supply pressure low, making it unsuitable for large-capacity processing. This invention was made in consideration of these circumstances, and its purpose is to use C 3 H 8 ,
It is an object of the present invention to provide a burner nozzle for powder thermal spraying that can obtain a sufficiently high flame temperature even when using C 4 H 10 or the like and can flame spray powder materials with a high melting point such as ceramics. Another object of the present invention is to provide a burner nozzle that can flame spray powder raw materials with a high welding rate. An embodiment of the present invention will be described below.
1 and 2 show the main body 9 of the burner nozzle for powder thermal spraying of this embodiment. In FIGS. 1 and 2, this burner nozzle body 9 is composed of an inner cylinder 10 and an outer cylinder 11. As shown in FIGS. Inner cylinder 1
0 consists of a first inner cylinder member 12 made of copper and a second inner cylinder member 13 made of copper. The first and second inner cylinder members 12 and 13 are connected to a first premixing/combustion chamber 1 which will be described later.
4, second premixing/combustion chamber 15, gas-solid flow supply hole 1
6, a combustion-supporting gas guide hole 17, a plurality of (eight in this embodiment) first combustion-supporting gas supply holes 18, . . . and second combustion-supporting gas supply holes 19 are formed. The outer cylinder 11 and the first inner cylinder member 12 are cylindrical, and the second inner cylinder member 13 is also substantially cylindrical. These outer cylinder 11, first inner cylinder member 12, and second inner cylinder member 13 are provided in a coaxial arrangement, and the outer cylinder 11
is provided so as to cover and surround the first inner cylinder member 12. The second inner cylinder member 13 has a smaller diameter than the first inner cylinder member 12 and is fixedly provided within the first inner cylinder member 12. One end of the first inner cylinder member 12 is opened as a flame jet port 12a. An end surface 13a of the second inner cylindrical member 13 on the flame outlet 12a side is set back from the flame outlet 12a by a predetermined length. the result,
A cylindrical hollow second premixing/combustion chamber 15 is formed by the end surfaces 13a of the first inner cylinder member 12 and the second inner cylinder member 13. A circular opening 14a is provided in the end surface 13a of the second inner cylinder member 13, and the second inner cylinder member 13 has a first premixing/combustion chamber in a substantially truncated conical shape that is continuous with the opening 14a. 14 are provided. At the top of the first premixing/combustion chamber 14 (on the opposite side of the opening 14a), a cylindrical hollow gas-solid flow supply hole 16 is provided so as to be continuous. In this way, gas-solid flow (powder raw material e.g. A 2 O 3
A flow that transports fuel gas such as C 3 H 8 or C 4 H 10 , such as C 2 H 8 . The same applies hereinafter) is sequentially introduced into the first premixing/combustion chamber 14 and the second premixing/combustion chamber 15 via the gas-solid flow supply hole 16. Thereafter, it is turned into a flame and is injected from the flame spout 12a. The outer diameter of the second inner cylinder member 13 is slightly smaller than the inner diameter of the first inner cylinder member 12 on the first premixing/combustion chamber 14 side. As a result, here, the second combustion-supporting gas supply hole 19 consisting of an annular slit
is formed. On the other hand, on the gas-solid flow supply hole 16 side, the outer diameter of the second inner cylinder member 13 is the same as that of the first inner cylinder member 1.
It is much smaller than the inner diameter of 2, and as a result,
An annular combustion-supporting gas guide hole 17 is formed here. Furthermore, first combustion-supporting gas supply holes 18, . These first combustion-supporting gas supply holes 18, ... are arranged in an annular manner on the conical wall surface of the first premixing/combustion chamber 14, and approximately in the direction of the opening 14a of the first premixing/combustion chamber 14. It is drilled so that it converges on the axis of the burner body. In this way, oxygen gas or oxygen-enriched air (hereinafter referred to as combustion-supporting gas) passes through the combustion-supporting gas guide hole 17 and is then supplied through the first combustion-supporting gas supply hole 18,... and the second combustion-supporting gas supply hole 19. They are supplied to the first and second premixing/combustion chambers 14 and 15, respectively, and mixed with the aforementioned gas-solid stream. Next, the function of the burner nozzle for powder thermal spraying configured as described above will be explained. In Figures 1 and 2, powder raw material A 2 O 3 is fuel gas.
C 3 H 8 and guided as a gas-solid flow through the gas-solid flow supply hole 16 as shown by arrow a at a flow rate of about 20 m/sec. In addition, the combustion-supporting gas is supplied through the combustion-supporting gas guide hole 17.
The flow rate is approximately 20m/sec as shown by arrow b, and then the flow rate is approximately 150m/sec through the first combustion-supporting gas supply holes 18,... and the second combustion-supporting gas supply holes 19.
As shown by arrows c and d, the first,
It is injected into the second premixing/combustion chambers 14 and 15. As a result, the fuel gas and combustion supporting gas are mixed. That is, the first combustion-supporting gas supply holes 18,...
Since the second combustion-supporting gas supply hole 19 is communicated with the premixing/combustion chamber 14 and the second premixing/combustion chamber 15, the gas-solid flow described above first passes near the supply holes 18,... Then, it passes near the supply hole 19. As a result, the combustion-supporting gas ejected from the supply holes 18, . At this time, each combustion-supporting gas supply hole 18,...19
is directed toward the flame outlet 12a (opening 14a), so the above-mentioned jetting of the combustion-supporting gas prevents the smooth supply of the gas-solid flow from the gas-solid flow supply hole 16 and disrupts the flow. There is no such thing. In this way, the gas-solid flow is smoothly supplied, and moreover, the combustion supporting gas is completely mixed with the gas-solid flow. Therefore, the first and second premixing/combustion chambers 1
A high flame temperature zone is formed from 4 and 15 to the area outside the flame outlet 12a, and even if the powder raw material in the gas-solid flow has a high melting point, the temperature zone extends to the area outside the flame outlet 12a. completely melted.
The flow velocity of the gas (flame) ejected from the flame outlet 12a is approximately 250 m/sec, and the flow velocity (velocity) of the mostly molten powder raw material is approximately 150 m/sec. The powder raw material is ejected from the flame outlet 12a at this flow rate, completely melted in the flame, and then welded to the base material (not shown). Further, the first combustion-supporting gas supply holes 18, . . . are provided in an annular arrangement on the conical surface of the first premixing/combustion chamber 14, facing toward the opening 14a (flame jet port 12a). Furthermore, the second combustion supporting gas supply hole 19
consists of an annular slit, and a flame spout 12
It faces in the direction of a. Therefore, the powder raw material in the gas-solid flow does not scatter unnecessarily, and the powder raw material in the gas-solid flow is moved to the center of the flame (the center of the first and second premixing/combustion chambers 14 and 15). Thermal spraying can be concentrated in the axial direction, thereby achieving a high welding rate. According to thermal spraying experiments using the above nozzle,
As shown in the "Table", even when C 3 H 8 and A 2 O 3 (pure) were used as the fuel gas and powder raw material, respectively, welding could be performed with an extremely high welding rate.
【表】
なお、この実施例では、気固流として粉体原料
を燃料ガスで輸送させてなるものを用いたが、燃
料ガスと支燃ガスとの混合ガスで粉体原料を輸送
させてもよい。また、第１支燃ガス供給孔を環状
の配列で設けられた小径の孔としたが、環状のス
リツトによつて構成するようにしてもよい。逆
に、環状のスリツトからなる第２支燃ガス供給孔
を環状の配列で設けられた小径の孔から構成して
もよい。
以上、実施例について説明したように、この発
明によれば、気固流に支燃ガスを完全に混合で
き、その結果高い火炎温度を実現でき、しかも気
固流中の粉体原料を火炎の中心に集めることがで
きるため、燃料ガスとしてC3H8，C4H10等を用い
ても高融点の粉体原料を高い溶着率で溶射するこ
とができる。[Table] In this example, a gas-solid flow in which the powder raw material was transported using fuel gas was used, but it is also possible to transport the powder raw material using a mixed gas of fuel gas and combustion supporting gas. good. Further, although the first combustion-supporting gas supply holes are arranged in an annular arrangement and have small diameters, they may be formed by annular slits. Conversely, the second combustion-supporting gas supply hole formed of an annular slit may be formed of small-diameter holes arranged in an annular arrangement. As described above in the embodiments, according to the present invention, it is possible to completely mix the combustion supporting gas into the gas-solid flow, and as a result, it is possible to achieve a high flame temperature. Since it can be collected at the center, even if C 3 H 8 , C 4 H 10 or the like is used as the fuel gas, powder raw materials with a high melting point can be thermally sprayed at a high welding rate.
第１図おび第２図はこの発明の一実施例を示す
もので、第１図は第２図の−線に沿つて断面
する横断面図、第２図は縦断面図である。
１０…内筒、１１…外筒、１２ａ…火炎噴出
口、１４…第１予混合・燃焼室、１５…第２予混
合・燃焼室、１６…気固流供給孔、１７…支燃ガ
ス案内孔、１８…第１支燃ガス供給孔、１９…第
２支燃ガス供給孔。
1 and 2 show an embodiment of the present invention, in which FIG. 1 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 2 is a vertical cross-sectional view. DESCRIPTION OF SYMBOLS 10... Inner cylinder, 11... Outer cylinder, 12a... Flame jet port, 14... First premixing/combustion chamber, 15... Second premixing/combustion chamber, 16... Gas-solid flow supply hole, 17... Combustion supporting gas guide Hole, 18...first combustion-supporting gas supply hole, 19...second combustion-supporting gas supply hole.
Claims (1)
その後端部から前端部に向かう配列で気固流供給
孔、第１予混合・燃焼室および第２予混合・燃焼
室を連続して形成し、前記第２予混合・燃焼室の
前記前端側を開口して火炎噴出口を形成し、前記
第１予混合・燃焼室の壁部に、前記軸線を中心と
して環状に配置され、かつ前記火炎噴出口に向け
て前記軸線に漸次近づくような方向に穿孔または
配置された小孔群またはスリツトを穿設してなる
第１支燃ガス供給孔を形成し、前記第２予混合・
燃焼室の壁部に、前記軸線を中心として環状に配
置され、かつ前記火炎噴出口を向く小孔群または
スリツトを穿設してなる第２支燃ガス供給孔を形
成したことを特徴とする粉体溶射用バーナーノズ
ル。1. A gas-solid flow supply hole, a first premixing/combustion chamber, and a second premixing/combustion chamber are continuously formed in the burner nozzle body coaxially with the axis thereof and arranged from the rear end to the front end; The front end side of the second premixing/combustion chamber is opened to form a flame jetting port, and the flame jetting port is arranged annularly around the axis on the wall of the first premixing/combustion chamber, and A first combustion-supporting gas supply hole is formed by forming a group of small holes or slits that are drilled or arranged in a direction gradually approaching the axis, and the second premixing gas supply hole is
A second combustion-supporting gas supply hole is formed in the wall of the combustion chamber by a group of small holes or slits arranged annularly around the axis and facing the flame outlet. Burner nozzle for powder thermal spraying.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1944679A JPS55111861A (en) | 1979-02-21 | 1979-02-21 | Burner nozzle for flame-spraying pulverized material |
| DE19803006558 DE3006558A1 (en) | 1979-02-21 | 1980-02-21 | POWDER SPRAY COATING BURNER |
| FR8004126A FR2449479A1 (en) | 1979-02-21 | 1980-02-21 | BURNER FOR POWDER SPRAY COATING |
| US06/595,344 US4569479A (en) | 1979-02-21 | 1984-03-30 | Burner for powder spray coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1944679A JPS55111861A (en) | 1979-02-21 | 1979-02-21 | Burner nozzle for flame-spraying pulverized material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55111861A JPS55111861A (en) | 1980-08-28 |
| JPS6145496B2 true JPS6145496B2 (en) | 1986-10-08 |
Family
ID=11999527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1944679A Granted JPS55111861A (en) | 1979-02-21 | 1979-02-21 | Burner nozzle for flame-spraying pulverized material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55111861A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5692678A (en) * | 1995-05-01 | 1997-12-02 | Kawasaki Steel Corporation | Flame spraying burner |
| KR100924821B1 (en) | 2009-06-16 | 2009-11-03 | 주식회사 봉화라이너 | Spray coating apparatus |
-
1979
- 1979-02-21 JP JP1944679A patent/JPS55111861A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55111861A (en) | 1980-08-28 |
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