JPH07102358A - Method and apparatus for high velocity flame spraying of highly fusible wire and powder thermal spray materials for surface coating - Google Patents

Abstract

(57) [Summary] [Purpose] Coating by increasing the kinetic energy of the flame jet to increase the adhesion-tensile fracture strength of the thermal spray material to the substrate and to lower the porosity to further enhance the airtightness of the thermal spray coating layer. Improve layer quality. [Structure] The thermal spray material is melted by the primary heating flame, accelerated by the generated primary high-speed flame, introduced into the secondary combustion chamber at the rear through the primary expansion nozzle hole, and while the thermal spray material in the molten plastic state is entrained. The primary high velocity flame flowing at supersonic speed through the secondary combustion chamber is caused to flow into a secondary water-cooled secondary expansion nozzle hole that is concentric with the secondary combustion chamber, and thus the secondary Secondary combustion gas opening to the combustion chamber-a negative pressure zone is generated in the range of the oxygen passage to enable the supply of the heating gas mixture with a low inflow pressure, and further, the heating gas mixture is ignited and expanded in the secondary combustion chamber, In addition, the residue of the thermal spray material is melted and accelerated based on the high flame temperature and the extreme ignition / combustion speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for high-velocity flame spraying of high-melting linear and powder type thermal spraying materials for surface coating. All gas type high speed flame spray burners are used for surface coating with powder spray materials.

Furthermore, in this case, two or more gas-mixing systems operating independently of each other, which can operate with various combustible gas-oxygen mixtures, are incorporated in the flame spraying apparatus.

[0003]

BACKGROUND OF THE INVENTION Although numerous methods, devices and technologies are known from the prior art, these can no longer meet the high demands of modern technology.

According to West German Patent No. 81 18 99, a device for spraying metallic and non-metallic materials is proposed, which device is intended for high speed spraying using combustible gas and oxygen. It can be regarded as a basic principle. The device in this case is essentially a device consisting of a combustion chamber and an expansion nozzle, which mainly uses hydrogen as the detonating gas to spray the linear, powder or molten liquid phase thermal spray material. In short, the device proposed in the abovementioned patents only works in each case with a heating or driving gas, which is mainly hydrogen, which is introduced into the combustion chamber on the basis of the pressure gas principle.
Ignition of hydrogen is carried out manually according to the patent specification, by an electrical short circuit when the hydrogen is ejected from the expansion nozzle or by an electric arc.

Ignition of hydrogen can also be effected by means of a thermal spray material which has been heated to a molten liquid phase which is merged with the detonating gas through the combustion chamber via the inlet.

[0006] The construction means proposed in the above-mentioned West German Patent No. 81 18 99 do not meet the requirements imposed on the current high-speed flame spraying equipment in numerous criteria.

[0007] In one aspect, combustible gas (hydrogen according to the patent specification) is introduced into the combustion chamber based on the pressure gas principle, and this principle also complies with the gas burner structure regulation and the disaster prevention regulation UVV-VGB 15. Not not.

Furthermore, the heating efficiency of hydrogen is not sufficient to enable thermal spraying of highly fusible thermal spray materials such as molybdenum, tungsten and oxides without additional oxidizing gas such as oxygen. . On the other hand, hydrogen burns with reduction and is therefore not suitable for spraying metal oxides for this reason. This is because hydrogen flames deprive the spray material of the molten liquid phase or plastic state of oxygen.

A further high-velocity flame spraying system is known from EP 0 049 915. The high speed flame spray system has a water cooled expansion nozzle that is suitable for spraying linear and powder spray materials. Said German Patent No. 81 18 99
In contrast to the means disclosed in U.S. Pat. No. 5,037,048, hydrogen, propane or MAPP gas is optionally used as heating gas together with oxygen. The combustible gas used in each case is led to a large mixing chamber and mixed with oxygen on the basis of the pressure gas principle. The combustible gas-oxygen mixture reaches the water-cooled expansion nozzle through the plurality of holes, and then the mixture mixes with the powder or linear spray material in the combustion chamber.

However, said European Patent Application Publication No. 0 0
The construction means disclosed in 49 915 still have many drawbacks in terms of application technology and safety measures.

The construction means proposed in EP 0 049 915 eliminates the use of acetylene as a heating gas. Because that
Because of the pressure gas mixing principle, the possibility of flashback and flashback is extremely high due to the high ignition speed of acetylene. The exclusion of the combined use of acetylene and oxygen would severely limit the scope of application. This is because, for example, thermal spray materials such as high melting metals and oxides can only be sprayed with an acetylene oxygen flame at 3160 ° C. because of the high flame energy. Ignition speed of about 3.6 m / sec. At a mixing ratio of 1: 5. Of the acetylene-oxygen mixture of about 11.5 m / sec compared to that of the propane-oxygen mixture (although the ignition rate is actually subject to a decisively higher flame velocity and thus higher particle motion velocity). ． The extremely high ignition rate of is not available in the proposed high velocity thermal spray system. Further, such a gas mixing system does not comply with the above-mentioned disaster prevention regulations or the structural regulations of gas burners.

The acetylene-oxygen flame has excellent properties that can never be obtained with other combustible gas-oxygen mixtures, for this reason due to the thermal spraying of highly fusible thermal spray materials. Is ideally suited for.

However, the use of acetylene together with oxygen as a heating gas in order to operate a high-velocity flame spraying apparatus has problems due to the special molecular structure of acetylene.

Acetylene is a chemical bond between carbon and hydrogen. There is a so-called unsaturated hydrocarbon, and the molecule of the unsaturated hydrocarbon is full of internal tension to try to balance. In short, acetylene is not a stable substance, but rather tends to decompose into its constituents: carbon and hydrogen. For example, about 300 acetylene
When heated to a temperature of 0 ° C., the acetylene is pressurized, so that the decomposition, once initiated, propagates through the entire gas volume. The energy released in the form of heat is sufficient to bring the adjacent acetylene microparticles to the decomposition temperature. This process of operation is extremely rapid, and when decomposition starts, the compressed acetylene decomposes into a flammable state. This state occurs, for example, when acetylene is introduced into the combustion chamber of a high-speed burner and ignited, and expansion causes combustion chamber pressures in the order of 2 to 3.5 bar, which is a dam for combustible gas induction. Will cause the acetylene decomposition described above.

On the basis of the above-mentioned inconvenience, back ignition occurs in the gas mixing region where the combustible gas (acetylene and oxygen in this case) joins. The negative phenomenon mentioned above
Combustible gas, acetylene and oxygen are burned in the combustion chamber,
Obviously, this would impede the production of high speed flames.

It is also known in the state of the art to produce oxide-free thermal spray coatings, for example of Hastelloy, Triballoy or high-purity nickel, using the plasma vacuum chamber thermal spraying method. However, this technology is extremely complex and extremely expensive.

[0017]

SUMMARY OF THE INVENTION The object of the present invention is to provide a high-velocity flame spraying method and an apparatus for implementing the same, which enables operation with acetylene and oxygen without any problem. Simultaneous simplification of the process, and at the same time, the kinetic energy of the flame jet is significantly increased to optimize the adhesion-tensile fracture strength of the thermal spray material to the substrate, and the porosity is reduced to further enhance the airtightness of the thermal spray coating layer. The aim is to improve the quality of the coating layer satisfactorily and thus significantly reduce the production costs.

[0018]

SUMMARY OF THE INVENTION The method component of the present invention which solves the above-mentioned problems is a wire-type charging system in which the primary combustion chamber is charged with at least two gas-mixing systems operating independently of each other. The powder thermal spraying material is melted by a primary heating flame concentrically arranged around the supply passage, accelerated by a primary high-velocity flame generated, and introduced into a secondary combustion chamber afterwards through a primary expansion nozzle hole, Moreover, the primary high-velocity flame flowing at a supersonic speed through the secondary combustion chamber while entraining the thermal spray material in the molten plastic state is concentrically expanded to the secondary combustion chamber, and is installed behind the shaft. In the direction of the water-cooled secondary expansion nozzle body or secondary expansion nozzle hole, and thus arranged radially and axially and / or in a focusing alignment and open into the secondary combustion chamber. Secondary combustion gas-
In the range of the oxygen passage, a negative pressure zone is generated to enable the heating gas mixture to be supplied with a low inflow pressure, and in the secondary combustion chamber, the heating gas mixture is ignited and expanded in the radial and axial directions around the primary high velocity flame. In addition, the heating gas mixture is used for melting the thermal spray material residue and for additionally accelerating the thermal spray material based on the high flame temperature and the extreme ignition / combustion rate.

It is advantageous to carry out the primary gas mixing in an intermediate member designed as an injector gas mixing block and the secondary gas mixing in a primary combustion chamber casing designed as a mixing block for the secondary gas. . In a particularly advantageous embodiment of the invention, in the immediate vicinity of the primary combustion chamber, the primary heating gas mixing takes place directly in the gas mixing block according to the injector principle, and in the secondary injector gas mixing block the primary combustion chamber and / or Alternatively, an expansion nozzle is incorporated.
In the method of the present invention, it is possible to supply the powder-form thermal spray material and the powder carrier gas at room temperature, or preheat and supply the powder-form thermal spray material and / or the powder carrier gas. In this case, the connection passages for the spray material and / or the powder carrier gas are equipped with a water cooling device. The room temperature or preheated thermal spray material starts to melt when running through the primary combustion chamber, runs through the secondary combustion chamber by the primary heating flame, melts and is accelerated, and ejects from the expansion nozzle hole together with the secondary flame. To do so.

In order to solve the above-mentioned problems, the constituent means on the apparatus of the present invention is an apparatus for carrying out the high speed flame spraying method according to claim 1, which is configured as a spray gun, wherein the spray gun is a gun base body. In a high-velocity flame spraying device of the type consisting of a use component connection block having a distribution chamber, an injector gas mixing block, and a central hole for cooling material and a cooling device, a secondary gas passage starting from the use component connection block, The secondary heating gas passage, the primary gas passage, and the primary heating gas passage are separately connected to the primary combustion chamber or the secondary combustion chamber, and the supply passage for the thermal spray material is surrounded by the primary gas passage and the primary heating gas passage. Open to the primary combustion chamber, and the secondary gas passage and the secondary heating gas passage are guided toward the expansion nozzle beyond the primary combustion chamber toward the expansion nozzle. It is characterized by being open to the combustion chamber.

In a preferred embodiment of the invention, the device comprises a component connection block, a gun base, a gas mixing block support, an injector gas mixing block, a primary combustion chamber casing with internal parts or central bores, crimping. It comprises a screw and cap sleeve part, as well as a secondary expansion nozzle body, an inner screw sleeve and an outer screw sleeve.

At least one used component connection block is provided.
Connection passage for two cooling water intakes, connection passage for secondary gas,
It has a connection passage for primary gas, a connection passage for powder type and / or linear thermal spraying material, a connection passage for primary heating gas, a connection passage for secondary heating gas and a connection passage for returning cooling water, and each of the passages has the above-mentioned constituents. It is particularly advantageous for the associated passage to be formed in communication with the end face of the connection block or the distribution chamber arranged on the end face.

The passage or distribution chamber of the use component connection block communicates with the equal medium passage of the gun base body connected to the use component connection block.

The gun base at least partially encloses and houses a gas mixing block support for the secondary gas, in which the injector gas mixing block for the primary gas is arranged. ing.

It is particularly advantageous for the gun base body to have a passage which communicates with the passage of the use component connection block or with an annular passage arranged on the end face of the use component connection block.

According to another embodiment of the present invention, the passage of the gun base body is opened to the cooling water feed passage between the inner screw sleeve and the outer screw sleeve, and the passage for returning the cooling water is It communicates with a cooling water return passage formed between the base body and the crimping screw.

In an advantageous embodiment of the invention, at least one secondary gas passage and a secondary heating gas passage each extend through the interior of the gas mixing block support and on one side of the gun base body. The passages for equal media are communicated with each other, and at the end surface near the primary combustion chamber, they communicate with the radial annular grooves for the secondary heating gas and the secondary gas, which are arranged on the end surface.

The injector gas mixing block for the primary gas has at least one primary heating gas passage and one primary gas passage and a central hole for the thermal spray material, each said passage being on one side of the gun base body or the like. The primary heating gas passage is in communication with a medium passage, and the primary heating gas passage is in a radial annular chamber between the gas mixing block support and the injector gas mixing block, and the primary gas passage is an annular chamber for oxygen distribution. On the other hand, the central hole for the thermal spray material extends to the end face of the injector gas mixing block, and from the annular chamber for oxygen distribution through the injector pressure nozzle holes to the injector gap. A plurality of injector mixing nozzle bores lead to a radial annular groove.

A primary combustion chamber casing is connected to the injector gas mixing block in the direction of the secondary expansion nozzle body, the primary combustion chamber casing comprising a plurality of injector gas mixing holes for the primary gas mixture and thermal spraying. Having at least one internal part with a central hole for the material
Particularly advantageous.

In this case, a plurality of injector gas mixing holes are arranged axially and / or concentrically in the inner part.

A radial annular groove for combustible gas-oxygen-primary gas is arranged on the end face of the inner part near the injector gas mixing block, which radial annular groove is the radius of the injector gas mixing block. Communicating with the annular groove,
Further, the central hole for the thermal spray material in the inner portion communicates with the central hole of the injector gas mixing block.

The primary combustion chamber casing has one radial annular groove for the secondary heating gas and one radial annular groove for the secondary heating oxygen on the end surface near the gas mixing block support. Advantageously, the radial annular groove is in communication with the radial annular groove for the equal medium of the gas mixing block support.

Corresponding passages extend from the radial annular groove for the secondary gas and the radial annular groove for the secondary heated oxygen, the passages joining at one radial annular groove forming an injector gap. In this case, the passage opens directly into the radial annular groove and the passage opens into the radial annular groove via an injector pressure nozzle hole. In this case, the passage for the secondary heating gas is at least partly formed by the gap between the primary combustion chamber casing and the cap-shaped sleeve part.

A plurality of secondary gas mixture pores extending in the axial direction and converging from the radial annular groove as a starting point communicate with the secondary combustion chamber. Moreover, the secondary gas mixture pores are guided beyond the primary combustion chamber. A secondary expansion nozzle body is connected to the secondary combustion chamber.

The cooling water feed passage extends from the connection passage of the used component connection block through the gun base body, between the inner screw sleeve and the outer screw sleeve to the radial hole of the expansion nozzle ejection hole, and then the cooling water. To the return passage, in which case the cooling water passage extends between the secondary expansion nozzle body and the inner screw sleeve and transitions to the cooling water return annular chamber, from which the cooling water passage is connected to the used component connection block. Has reached the connection passage for returning the cooling water.

In a particularly advantageous design, the primary combustion chamber casing is designed as a secondary injector gas mixing block. In this case, it is particularly advantageous for the primary combustion chamber of the primary combustion chamber casing to have a primary expansion nozzle bore.

[0037]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a high speed flame spray apparatus of the present invention configured as a flame spray gun.

The high-velocity flame spraying apparatus comprises a component connection block 9, a gun base 12, a mixing nozzle block / injector gas mixing block 13 for the primary gas, a gas mixing block support 14, a cap-shaped sleeve portion 8.
0 and a primary combustion chamber casing 29 having a crimp screw 62,
It comprises an expansion nozzle body 39, an inner screw sleeve 34 and an outer screw sleeve 35 which surround the expansion nozzle body 39, and an inner part 76 which accommodates a central bore 81.

The high-velocity flame spraying apparatus has a cooling water feed passage 1, a secondary gas passage 2, a primary gas passage 3, a (powder type or linear type) central hole 4 for supplying a thermal spray material, and a primary heating gas passage. 5, the secondary heating gas passage 6 and the cooling water return passage 7 extend therethrough.

The primary gas and the primary heating gas are mixed in the injector gas mixing block 13 for the primary gas and enter the primary combustion chamber 28. At that time, the primary gas and the primary heating gas are also charged into the primary combustion chamber 28. Alternatively, the powder-type thermal spray material is melted by the primary heating flame 64 arranged concentrically around the supply center hole 4, and is accelerated by the generated primary high-velocity flame 65,
Also, the secondary combustion chamber 3 is installed downstream through the primary expansion nozzle hole 30.
Introduced in 2. The primary high-velocity flame 65 flows through the secondary combustion chamber 32 at a supersonic velocity while entraining the thermal spray material in a molten plastic state. The primary high velocity flame 65 is formed in the secondary combustion chamber 3
2 into the axially extending water-cooled secondary expansion nozzle body 39 or the secondary expansion nozzle hole 38, which is concentrically located downstream of the two, and is therefore radially / axially and / or focusing aligned. In the range of the secondary combustion gas-oxygen passages 44 and 45 which are arranged as described above and open to the secondary combustion chamber 32, a negative pressure zone occurs and the heated gas mixture can be supplied at a low inflow pressure. Moreover, in the secondary combustion chamber 32, the heated gas mixture ignites and expands around the primary high-velocity flame 65 in the radial and axial directions, and the heating is performed based on the high flame temperature and the ultimate ignition / combustion rate. The gas mixture contributes to the melting of the thermal spray material residue and the additional acceleration of the thermal spray material.

In this case, the outer screw sleeve 35 surrounds the inner screw sleeve 34 so as to form an annular chamber 36 for feeding cooling water. The inner threaded sleeve 34 has internal threads 83 and therefore the gun base body 12
It can be screwed into the male thread 84 and is sealed by the O-ring 19. The outer screw sleeve 35 has a male screw thread 85, which engages with the female screw thread 86 of the gun base body 12, that is, is screw-fastened to the gun base body 12. Again, an O-ring 1 for sealing purposes
5 is fitted. With this configuration, the annular chamber 36 for the cooling water feed passage 1 continues to the gun base body 12. In the area of the expansion nozzle ejection hole 43, O-ring packings 41 and 42 are also arranged between the outer screw sleeve 35 and the inner screw sleeve 34 and between the inner screw sleeve 34 and the secondary expansion nozzle body 39.

With the annular chamber 36 as the starting point, the cooling water passage 1c
Reaches the cooling water passage 1b of the used component connection block 9 through the gun base body 12, and the used component connection block has a connection passage 1a for taking in cooling water.

The component-to-be-used connection block 9 is attached to the gun base body 12 by a fixing screw 8 having a head with a tool fitting groove.
And is sealed by an O-ring 50, which encloses and seals the connecting passages 1a to 7a and the fixing screw 8, respectively.

A secondary expansion nozzle body 39 is arranged inside the inner screw sleeve 34, and the secondary expansion nozzle body 39 is screwed to the inner primary combustion chamber casing 29.

In this case as well, an annular chamber 37 is formed between the secondary expansion nozzle body 39 and the inner screw sleeve 34 in order to recirculate the cooling water. The annular chamber 37
Has moved to an annular chamber 33 having a larger cross-sectional area, and moreover, the cooling water passage 7d penetrating the gun base body 12 from the connection passage 7a of the used component connection block 9 as a starting point is an annular chamber having the large cross-sectional area. It opens at 33.

In this case, the cooling water passage 7d is provided with the annular chamber 3 through the gap between the gun base body 12 and the crimping screw 62.
It is led to 3.

Therefore, this cooling system follows the following path. That is: The cooling water flows into the cooling water passage 1b of the gun base body 12 from the connection passage 1a of the cooling water supply passage 1 of the used component connection block 9, and flows into the cooling water passage 1b of the gun base body 12 through the annular chamber 36 and the inner screw sleeve 35 and the inner thread. Screw sleeve 34
And a plurality of radial holes 40 for feeding the cooling water, and flow into the annular chamber 37. Secondary expansion nozzle body 39
The cooling water returns to the cooling water return passage 7 through the cooling water passage 7d through the annular chamber 37 formed between the inner screw sleeve 34 and the inner screw sleeve 34.

Next, based on FIGS. 2 and 3 and FIGS. 4 to 8, in the above-described embodiment, the operation is performed independently of each other.
The two gas mixing systems will be described in detail. However, the device described below is the same device as that already shown in FIG.

In FIG. 2 and FIG. 3, in order to facilitate the discrimination between the cooling water supply side and the cooling water return side, the cooling water supply passage is indicated by a broken line and the cooling water return passage is indicated by a chain line. displayed. Further, in this case, the secondary gas path is indicated by a wavy line extending from the upper left to the diagonally lower right, and the secondary heating gas path is indicated by a wavy line extending from the lower left to the diagonally upper right. Furthermore, the primary gas path is shown as a horizontal wavy line, and the primary heating gas path is shown as a vertical wavy line, and the horizontal and vertical wavy lines that cross each time represent a mixture. The large number of dots scattered within the central hole represent the thermal spray material.

First, the primary system will be described with reference to FIG. For the primary system, the used component connection block 9 comprises, for example, a connection passage 3a, in particular for heated oxygen (primary gas) and a connection passage 5 for a combustible gas (primary heating gas) such as hydrogen or propane.
a and.

From the connection passage 3a for heated oxygen (primary gas), the gas passage 3b passes through the used component connection block 9 and reaches the oxygen distribution chamber 11 provided on the end surface 68 of the connection block near the gun base body 12. ing.

The primary gas passage 3 is a passage 3c in the gun base body 12 and a passage 3 in the injector gas mixing block 13.
and d. In this case, the passage 3c is open to the oxygen distribution chamber 11, and the passage 3d is an inner mixing nozzle block, that is, the injector gas mixing block 1.
3 is open to an annular chamber 56 for distributing oxygen. The passage 5b reaches the combustible gas distribution chamber 10 from the combustible gas connection passage 5a inside the used component connection block 9, and the combustible gas distribution chamber is also close to the gun base body 12 of the used component connection block 9. Is disposed on the end surface 68 of the. A passage 5c in the gun base body 12 from the combustible gas distribution chamber 10 opens to the annular chamber 57 via the passage 5d.

As already mentioned, oxygen is distributed in the annular chamber 56, which then acts as a pressure compensation chamber. Oxygen flows through the injector pressure nozzle hole 58 through the annular groove (injector gap) 57a connected to the annular chamber 57, and then the injector mixing nozzle hole 59 while entraining a combustible gas from the injector gap.
Flow through. The combustible gas-oxygen mixture reaches the primary gas combustion chamber 28 via the combustible gas-oxygen mixture pores 47 and 48 via the radial annular groove 22 / 22a. Combustible gas (mainly hydrogen, propane gas or propylene) is supplied to the primary heating gas passage 5 and the combustible gas distribution chamber (pressure compensation chamber)
10 through the passages 5c / 5d and the radial annular chamber 57, and flows into the radial annular groove (injector gap) 57a. The combustible gas from the radial annular groove 57a is entrained in the injector mixing hole 59 and mixed by the injector action of oxygen flowing at supersonic speed. Thus, the primary gas mixture composed of combustible gas and oxygen reaches the primary combustion chamber 28 through the injector gas mixing holes 47 and 48.

The injector action in the injector gas mixing block (inner gas mixing block) 13 is as follows.
It is obtained with an oxygen inlet pressure higher than the combustible gas inlet pressure. When the primary combustible gas-oxygen mixture that is ejected from the expansion nozzle ejection hole 43 (see FIG. 1) is ignited, the flame moves backward into the primary combustion chamber 28. The combustible gas-oxygen mixture ejected from the cylindrical primary expansion nozzle hole 30 or the primary combustion chamber hole 46 of the primary combustion chamber 28 is water-cooled through the secondary combustion chamber 32 while burning as a primary high velocity flame. Enters into the expansion nozzle hole 38. Secondary gas mixture holes 44, 4 arranged concentrically around the primary combustion chamber hole 46 in the axial direction.
In the inflow region of 5, the negative pressure zone is generated due to the high flame velocity of the primary heating gas flow.

Next, the secondary system will be described with reference to FIG. Secondary heating oxygen is supplied to the connection passage 2a,
The radial annular groove 63/21 (pressure compensating / distributing annular groove) is reached via b, 2c and 2d. Oxygen reaches a large number of injector pressure gas holes 24 through the oxygen connection holes and is accelerated to supersonic velocity in the injector pressure gas holes to flow through the radial annular groove 25 (injector gap). Axially and / or convergingly aligned mixing holes 26 which carry flammable gas from the directional annular groove 25 and which oppose each other.
Flows into the inside and is ejected from the secondary gas mixture holes 44 and 45 as a combustible gas-oxygen mixture. The jet flow is positively affected by the negative pressure zone generated by the primary high velocity flame in the inflow region of the secondary gas mixture pores. The combustible gas-oxygen mixture (mainly acetylene-oxygen mixture) flowing into the secondary combustion chamber 32 touches the primary high-velocity flame and ignites,
Optimizes the melting behavior of the spray material particles and increases flame velocity and spray material particle velocity.

For this purpose, the used component connection block 9 includes a connection passage 2a for heating oxygen (secondary gas) and combustible gases C2, H.
2 (secondary heating gas) for connecting passage 6a,
From the connection passages 2a, 6a, the passages 2b, 6b pass through the use component connection block 9 and reach the end surface 68 (see FIG. 4).

At the end face 68, a passage 2c connected to the passage 2b penetrates the gun base body 12 to reach the passage 2d of the gas mixing block support 14, and also the end face 6
A passage 6c connecting to the passage 6b at 8 communicates with the passage 6d of the gas mixing block support 14. The passage 2d
Also reaches the radial annular groove 63 or 21, and the passage 6d reaches the radial annular groove 18. In this case, the same applies to the case of the primary system, but the radial annular groove of the gas mixing block support 14 is the primary combustion chamber casing 29.
Of the radial annular groove. After passing through the hole 23 for secondary heated oxygen, the heated oxygen (secondary gas) passes through a plurality of injector pressure nozzle holes 24 (each of these injector pressure nozzle holes has a focusing position and an axial position). Flow into the radial annular groove 25 (injector gap), from which the mixture then jets out via the secondary gas mixture holes 44, 45, as already mentioned.

Further shown in FIGS. 2 and 3 is a central hole 4 for a powder or wire spray material.

In this case, a connection passage 4 is arranged in the used component connection block 9 for supplying the thermal spray material,
A passage 4b extends from the connection passage to the end face 68, and at the end face, the passage 4b is aligned with the passage 4c of the gun base body 12 and transitions to the passage.

A passage 4d continues in the injector gas mixing block 13, and the passage is formed by the inner portion 76 for the central hole.
It is aligned with the hole 49 for advancing the thermal spray material (see FIGS. 2 and 9).

FIG. 9 is a sectional view taken along the line AA of FIG. 1, and FIG. 10 is a sectional view taken along the line BB of FIG.

Moreover, FIG. 9 shows the inflow area of the primary gas flow into the primary combustion chamber, and FIG. 10 shows the inflow area of the secondary gas flow in a front view.

Therefore, clearly identify the "axial" holes 44 for the secondary heating gas-oxygen mixture and the "focused" holes 45 for the secondary heating gas-oxygen mixture on the basis of FIG. You can

Also in FIG. 9, the "axial" injector gas mixing hole for the primary heated gas-oxygen mixture is designated 47.
And also "focused" for the primary heating gas-oxygen mixture
The injector gas mixing hole is indicated by reference numeral 48, the hole for advancing the thermal spray material is indicated by reference numeral 49, and the central hole body is indicated by reference numeral 81.

In FIG. 10, the secondary combustion chamber casing is designated by reference numeral 3.
1, the primary expansion nozzle hole is 30 and the "axial" hole for the secondary heating gas-oxygen mixture is 44, the "focused" hole for the secondary heating gas-oxygen mixture. Is code 45
Indicated by.

Similarly, in FIG. 10, the expansion nozzle hole for ejecting the primary flame is indicated by reference numeral 46, and the hole for advancing the thermal spray material is indicated by reference numeral 49.

The used component connection block 9 shown in FIG.
Cooling water feeding connection passage 1a, secondary gas connection passage 2a,
Connection passage 3a for primary gas, connection passage 4 for supplying thermal spray material
a, a connecting passage 5a for the primary heating gas, a connecting passage 6a for the secondary heating gas, and a connecting passage 7a for returning the cooling water. Each of the above-mentioned connection passages 1a to 7a corresponds to a corresponding passage in the use component connection block 9, that is, a passage 1b for an equal medium.
7b, the passages 1b-7b are aligned with corresponding passages 1c-7c of the gun base body 12.

Only the passage 3b for the primary gas and the passage 5b for the primary heating gas are provided only in the passage 3c in the gun base body 12,
Before connecting to 5c, it is opened to the oxygen distribution chamber 11 or the combustible gas distribution chamber 10. The used component connection block 9 is screwed to the gun base body 12 by a plurality of screws 8 and is hermetically sealed by the O-ring 50 on the end face 68.

As already described above, the gun base body 12 shown in FIG. 5 has the passages 1c to 7c that match the corresponding passages 1b to 7b for the equal medium of the used component connection block 9.

The secondary gas passage 2c and the secondary heating gas passage 6c of the gun base body 12 are provided in the gas mixing block support 1
4 are connected to the equal medium passages 2d and 6d, respectively, whereas the primary gas passage 3c and the primary heating gas passage 5c are connected to the equal medium passages 3d and 5d of the injector gas mixing block 13, respectively. There is. In this case, the central passage 4c for supplying the thermal spray material is aligned with the passage 4d of the injector gas mixing block 13. The cooling water feeding passage 1c communicates with a passage 1d formed between the inner screw sleeve 34 and the outer screw sleeve 35. In this case, the outer screw sleeve 35 is screwed to the female screw thread 86 of the gun base body 12 by its male screw thread 85, and the inner screw sleeve 34 is screwed to the male screw thread 84 of the gun base body 12 by its female screw thread 83.

The passage 7c for returning the cooling water communicates with the passage 7d formed between the gun base body 12 and the crimping screw 62.

The gas mixing block support 14 shown in FIG.
Has an injector gas mixing block 13 in the center,
Further, it has the passage 2d for the secondary gas and the passage 6d for the secondary heating gas which have already been described, and both passages are aligned with the passages 2c, 6c of the gun base body 12.

The end face 71 of the gas mixing block support 14 is provided with a radial annular groove 18 for the secondary heating gas and a radial annular groove 60 for the secondary gas, in this case the passage 2
d opens into the radial annular groove 60 and the passage 6d opens into the radial annular groove 18. The two radial annular grooves themselves are respectively in communication with the corresponding radial annular grooves 20, 21 of the medium of the primary combustion chamber casing 29.

The gas mixing block support 14 shown in FIG.
Injector gas mixing block 13 housed by
Has the passages 3d, 4d and 5d of the equal medium, which communicate with the primary gas passage 3c, the thermal spray material supply passage 4c and the primary heating gas passage 5c, respectively, as described above. . The passage 3d for the primary gas communicates with the annular chamber 56 for oxygen distribution, and from the annular chamber through the injector pressure nozzle hole 58 to the injector gap 57a, while the passage 5d for the primary heating gas does not. It leads to a radial annular chamber 57 for the primary heating gas (combustible gas) and from there to the injector gap 57a.
The mixture then flows through the injector mixing nozzle holes 59 into the radial annular groove 22a. Further, the central passage 4d for the thermal spray material reaches the end surface 65, where it transitions to the central passage 49 of the central hole body 81.

FIG. 8 shows a primary combustion chamber casing 29 having a radial annular groove 20 for the secondary heating gas and a radial annular groove 21 for the secondary heating oxygen, and a built-in primary combustion chamber casing 29. And an inner portion 76 having a central bore 81 is shown. As can be clearly seen from the figure, the primary combustion chamber casing 29 also performs secondary gas mixing and secondary heating gas mixing. This is done as follows.
That is, the air-fuel mixture introduced from the injector gas mixing block 13 flows into the primary combustion chamber 28 through the injector gas mixing holes 47, 48, and the secondary gas component and the secondary heating gas component are mixed in the gas mixing block. It is separately guided from the support 14 to the primary combustion chamber casing 29 and merges there in the radial annular groove 25 (injector gap), exits the primary combustion chamber 28 and passes through the secondary gas mixture holes 44, 45. It is guided into the secondary combustion chamber 32 of the secondary expansion nozzle body 39.

Acetylene-based on FIG. 11 to FIG.
The overwhelmingly superior characteristics of the oxygen flame will be described below.

FIG. 11 is a flame temperature diagram of a combustible gas-oxygen mixture as a function of combustible gas amount / oxygen amount, and FIG. 12 is a flame temperature diagram of combustible gas-oxygen mixture as a function of combustible gas amount / oxygen amount. A primary flame efficiency diagram, FIG. 13 is an ignition speed diagram of a combustible gas-oxygen mixture as a function of combustible gas amount / oxygen amount. As is clear from these diagrams, the acetylene-oxygen mixture flame has exceptionally remarkable characteristics that cannot be obtained by other combustible gas-oxygen mixture. For this reason, the acetylene-oxygen flame is both suitable and ideal for thermally spraying highly fusible thermal spray materials.

In order to prove the overwhelming superiority of acetylene-oxygen flame, the characteristic curve of acetylene is shown in FIG.
1.5-22.5% acetylene, 71.5-73.5
% Of ethylene and 5.0-6.0% propylene, and the mixture gas by TRG103 which has a composition, the mixture gas containing methyl-acetylene, and the characteristic curve of methane, propylene, and propane are shown in contrast.

Similar comparisons are shown in the diagrams of FIGS. 12 and 13.

For the sake of caution, the supply of powder and powder carrier gas will be described below with reference to FIGS. 1 to 8.

In the standard example, the powder and the powder carrier gas are supplied to the thermal spray material supply passage 4 at room temperature. In special cases, a preheated powder carrier gas (eg argon, nitrogen or other gas) and a preheated powder should be supplied, especially when spraying powdered thermal sprays of highly fusible metals or oxide ceramics. Is also possible. When this possible embodiment is mainly used, the connecting passage 4a is configured to have a water cooling action (cooling water feeding and cooling water returning), unlike the drawings shown in FIGS. 1 to 8. The mixture of the powder of the normal temperature type or the preheating type and the powder carrier gas is guided through the central passage 4 and flows out from the hole 49 in the primary combustion chamber 28.

The powder carrier gas mixture which is not preheated is melted by a high velocity flame and guided with kinetic energy through a secondary combustion chamber and is post-melted by a secondary heating flame (acetylene / oxygen flame) which coats it, It is additionally accelerated and guided through the water-cooled expansion nozzle hole 38, and from the expansion nozzle ejection hole 43 in an optimal molten state or in a molten plastic state with a secondary high velocity flame at a speed several times the speed of sound. Gush out.

When the preheated flame sprayed powder and the preheated powder carrier gas are supplied to the spray gun through the supply passage 4 (preheating temperature is 50 ° C. to 800 ° C.), the powder particles of the preheated spray material are primarily burned. When it is guided through the chamber and reaches the secondary combustion chamber by the primary heating flame, it is already in a good melted state, in which the powder particles are further melted and additionally accelerated, It is ejected from the expansion nozzle hole with the secondary high velocity flame at the maximum possible velocity. The powder type thermal spray material and the powder carrier gas are supplied to the primary combustion chamber 50
Preheating to ℃ to 800 ℃ has some advantages as compared with room temperature supply. This advantage includes, for example, a small temperature difference between the powder particles and the heating power of the primary flame. This leads to a much better melting of the powder if the residence time of the powder in the flame is equal, than if it were introduced at ambient temperature. Also, for example,
The preheated powder carrier gas is advantageous because it cools the primary and secondary flames less than the powder carrier gas supplied at room temperature. As a result, flame heating efficiency and flame velocity are further increased.

Further, it is also possible to charge the linear thermal spray material from the connection passage 4a through the supply passage 4 at the center into the primary combustion chamber for melting. The feed of the wire spray material is controlled in relation to the melting point and wire diameter so that a continuous spray material treatment can be performed.

FIG. 14 shows another modified embodiment of the present invention. The substantial functional difference in this embodiment is that the primary gas mixing is performed by the injector gas mixing block 13
In short, in comparison with the embodiment shown in FIG. 1, which is performed in the intermediate member, in this case, the primary heating gas mixture (mixture of combustible gas and oxygen) is provided in the immediate vicinity of the primary combustion chamber 28, that is, without the intermediate member. The point is that it is performed directly in the gas mixing block 13a based on the injector principle. The explanations given for the other device elements and method means in the embodiment shown in FIG. 1 are of course also relevant here in view of the adaptation of the variant embodiment shown in FIG. Since the embodiments are also subordinate to the general idea of the invention, the functional description will be omitted here.

The apparatus for carrying out the method of the present invention can be configured as an all gas type high velocity spray gun or a thermal spray burner for surface coating with any highly fusible linear or powder thermal spray material, and the total gas A high-speed spray gun or a spray burner of the type allows, for example, operation with acetylene and oxygen without problems.

[Brief description of drawings]

1 is a cross-sectional view of a thermal spray device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the primary system shown in FIG.

FIG. 3 is an enlarged cross-sectional view of the secondary system shown in FIG.

FIG. 4 is an enlarged view of a used component connection block.

FIG. 5 is an enlarged sectional view of a gun base body.

FIG. 6 is an enlarged cross-sectional view of a gas mixing block.

FIG. 7 is an enlarged sectional view of an injector gas mixing block.

FIG. 8 is an enlarged sectional view of a primary combustion chamber casing.

9 is a cross-sectional view taken along the line AA of FIG.

10 is a cross-sectional view taken along the line BB of FIG.

FIG. 11 is a flame temperature characteristic diagram of a combustible gas / oxygen mixture.

FIG. 12 is a primary flame efficiency characteristic diagram of a combustible gas / oxygen mixture.

FIG. 13 is an ignition speed characteristic diagram of a combustible gas / oxygen mixture.

FIG. 14 is a cross-sectional view of one modified embodiment of the thermal spray device according to the present invention.

[Explanation of symbols]

1 cooling water feed passage, 2 secondary gas passage, 3
Primary gas passage, 4 Supply passage for thermal spray material, 5 Primary heating gas passage, 6 Secondary heating gas passage, 7
Cooling water return passage, 8 Screw with tool fitting groove head, 9 Component connection block, 10 Combustible gas distribution chamber (primary gas), 11 Oxygen distribution chamber (primary gas), 12 Gun base body, 13 For primary gas Injector gas mixing block, 14 gas mixing block support for secondary gas, 15 O-ring,
18 radial annular groove for secondary gas, 19 O-ring, 20 radial annular groove for secondary gas, 21
Radial annular groove for secondary heated oxygen 22 Radial annular groove for combustible gas-oxygen-primary gas 22a
Radial annular groove, 23 hole for secondary heating oxygen, 2
4 injector pressure nozzle holes, 25 radial annular groove for secondary heating gas (injector gap),
26 hole for mixing secondary gas and oxygen, 28 primary combustion chamber, 29 primary combustion chamber casing, 30 primary expansion nozzle hole, 31 secondary combustion chamber casing, 32
Secondary combustion chamber, 33 annular chamber for returning cooling water,
34 Inner screw sleeve, 35 Outer screw sleeve, 36 Cooling water feeding annular chamber, 37
An annular chamber for returning cooling water, 38 expansion nozzle holes, 3
9 Secondary expansion nozzle body, 40 Radial hole for cooling water, 41, 42 O-ring, 43 Expansion nozzle ejection hole, 44, 45 Secondary gas mixture air hole, 46
Primary flame outlet expansion nozzle hole, 47, 48 injector gas mixing hole for primary gas mixture, 49 hole for thermal spray material, 50 O ring, 56 annular chamber for oxygen distribution, 57 for primary heating gas (combustible gas) Radial annular chamber, 57a injector gap, 58
Injector pressure nozzle hole, 59 injector mixing nozzle hole, 60 radial annular groove for secondary gas, 62 crimping screw, 63 radial groove for secondary oxygen, 64 primary heating flame, 65 high speed flame,
68,71,75 end face, 76 inner part for center hole, 77,78 end face, 79 hole for secondary heating gas, 80 cap-shaped sleeve part, 8
1, 82 central hole body, 83 female screw thread, 84,
85 male thread, 86 female thread

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Erwin Dieter Hühne Federal Republic of Germany Schallstadt Schöyerreweke 14

Claims (30)

[Claims] 1. A linear or powder thermal spray material charged in a primary combustion chamber (28) concentric with a supply passage (4) as a center, using at least two gas mixing systems operating independently of each other. Is melted by a primary heating flame (64) arranged in a fixed manner and accelerated by a generated high-velocity primary flame (65),
It is introduced into the subsequent secondary combustion chamber (32) through the primary expansion nozzle hole (30), and while flowing the sprayed material in a molten plastic state, it flows through the secondary combustion chamber (32) at supersonic speed. The primary high-velocity flame (65) that flows into the secondary combustion chamber (3
2) is introduced into the water-cooled secondary expansion nozzle main body (39) or the secondary expansion nozzle hole (38) which is concentrically expanded after the latter and extends in the axial direction. Secondary combustion gas-oxygen passages (44, 44, which are arranged in a directional and / or converging manner and open into the secondary combustion chamber (32)
In the range of 45), a negative pressure zone is generated to enable the supply of the heated gas mixture with a low inflow pressure, and in the secondary combustion chamber (32), the primary high velocity flame (65) is heated in the radial and axial directions The gas mixture is ignited and expanded, and the heated gas mixture is used for melting the thermal spray material residue and additionally accelerating the thermal spray material based on its high flame temperature and extreme ignition and burning speed. A method for high-velocity flame spraying of a high-meltability wire-type and powder-type spray material for surface coating, which comprises: 2. An injector gas mixing block (13)
The method of claim 1, wherein the primary gas mixing is performed in an intermediate member configured as. 3. The method as claimed in claim 2, wherein the secondary gas mixing is carried out in a primary combustion chamber casing (29) configured as a mixing block for the secondary gas. 4. The method according to claim 1, wherein the primary heating gas mixing is carried out directly in the gas mixing block (13a) on the injector principle in the immediate vicinity of the primary combustion chamber (28). 5. The method according to claim 1, wherein a primary combustion chamber and / or an expansion nozzle is incorporated in the secondary injector gas mixing block. 6. The method according to claim 1, wherein the thermal spray material in powder form and the powder carrier gas are supplied at room temperature. 7. A powder thermal spraying material and / or a powder carrier gas is preheated and supplied, according to claim 1.
Method described in section. 8. The method according to claim 7, wherein the connection passage for the thermal spray material and / or the powder carrier gas is water-cooled. 9. A room temperature or preheated thermal spraying material starts melting when running through the primary combustion chamber, and is melted and accelerated by running through the secondary combustion chamber by the primary heating flame, and the secondary through the expansion nozzle hole. 9. The method according to any one of claims 1 to 8, which is jetted with a flame. 10. An apparatus for carrying out the high speed flame spraying method according to claim 1, which is configured as a spray gun, wherein the spray gun comprises a gun base body (12) and distribution chambers (10, 11).
Component connection block (9), injector gas mixing block (13) and central hole (4) for thermal spray material
A high speed flame spraying apparatus of the type comprising a cooling device and a secondary gas passage (2), a secondary heating gas passage (6), a primary gas passage (3) and a starting component connection block (9) as a starting point. A primary heating gas passage (5) communicates with the primary combustion chamber (28) or the secondary combustion chamber (32) separately, and a supply passage (4) for the thermal spray material has the primary gas passage (3) and the primary It is surrounded by a heating gas passage (5) and opens to the primary combustion chamber (28), and the secondary gas passage (2) and the secondary heating gas passage (6) expand beyond the primary combustion chamber (28). A high-velocity flame-sprayed high-melting wire-type and powder-type spray material for surface coating, which is guided toward a nozzle (39) and opens in the secondary combustion chamber (32). Device to do. 11. Component connection block (9), gun base body (12), gas mixing block support (14), injector gas mixing block (13), internal part (7).
6) or a primary combustion chamber casing (29) having a central bore (81), a crimping screw (62) and a cap sleeve part (80), and a secondary expansion nozzle body (39), an inner screw sleeve (34) and Device according to claim 10, consisting of an outer threaded sleeve (35). 12. A connection passage (1a) for intake of cooling water, a connection passage (2a) for secondary gas, and a connection passage (3) for primary gas, each of which has at least one used component connection block (9).
a), a powder type and / or wire type thermal spray material connecting passage (4
a), a primary heating gas connection passage (5a), a secondary heating gas connection passage (6a), and a cooling water return connection passage (7a), each of the passages being the use component connection block (9).
End face (68) or a distribution chamber (10,
Affiliation (1b, 2b, 3b, 4)
b) 5b, 6b, 7b) forming and communicating with each other. 13. A gun base body (12) or the like in which the passages (1b to 7b) or the distribution chambers (10, 11) of the use component connection block (9) are connected to the use component connection block (9). Medium passages (1c, 2c, 3c, 4c, 5
c, 6c, 7c), which is in communication with
The apparatus according to claim 1. 14. A gun base body (12) at least partly for a gas mixing block support (14) for a secondary gas.
The gas mixing block support (1
Device according to any one of claims 10 to 13, wherein an injector gas mixing block (13) for the primary gas is arranged in 4). 15. An annular passage (10, 11) in which a gun base body (12) is arranged in a passage (1b to 7b) of a use component connection block (9) or an end surface (68) of the use component connection block. Device according to any one of claims 10 to 14, having a passageway (1c to 7c) in communication with. 16. The passage (1c) of the gun base body (12).
Is opened to the cooling water feed passage (1d) between the inner screw sleeve (34) and the outer screw sleeve (35), and the cooling water returning passage (7c) is connected to the gun base body (1).
Device according to any one of claims 10 to 15, which is in communication with a cooling water return passage (7b) formed between 2) and a crimping screw (62). 17. At least one secondary gas passage (2d) and a secondary heating gas passage (6d) each extend through the interior of the gas mixing block support (14) and on one side the gun The medium passages (2c, 2c of the base body (12),
6c,) respectively, and at the end face (71) near the primary combustion chamber (28), radial annular grooves (18, 60) for the secondary heating gas and the secondary gas, which are disposed on the end face. A device according to any one of claims 10 to 16 leading to. 18. An injector gas mixing block (13) for the primary gas has at least one primary heating gas passage (5d) and one primary gas passage (3d) and a central hole (4d) for the thermal spray material, Each of the above passages (3d, 4d, 5
d) communicates with the equal medium passages (3c, 4c, 5c) of the gun base body (12) on one side, and the primary heating gas passage (5d) is connected to the gas mixing block support (14). In the radial annular chamber (57) between the injector gas mixing block (13) and the primary gas passage (3).
d) is open to the annular chamber (56) for oxygen distribution, whereas the central hole (4d) for the thermal spray material extends to the end face (75) of the injector gas mixing block (13) and A plurality of injector mixing nozzle holes (59) are introduced from the oxygen distribution annular chamber (56) through a plurality of injector pressure nozzle holes (58) to an injector gap (57a). Device according to any one of claims 10 to 17, which leads to one radial annular groove (22a). 19. An injector gas mixing block (1
A primary combustion chamber casing (29) is connected to 3) in the direction of the secondary expansion nozzle body (39), and the primary combustion chamber casing has a plurality of injector gas mixing holes (47) for the primary gas mixture. , 48) as well as the central hole for the thermal spray material (49)
19. A device according to any one of claims 10 to 18, having at least one internal portion (76) internally mounted therein. 20. A plurality of injector gas mixing holes (4)
20. Device according to any one of claims 10 to 19, wherein 7, 48) are arranged in the inner part (76) axially and / or in a focusing manner. 21. An injector gas mixing block (1
3) A radial annular groove (22) for combustible gas-oxygen-primary gas is arranged at the end face (77) of the inner part (76), which is closer to the inner annular portion (76), the radial annular groove being an injector gas mixing block. 11. A radial bore (22a) in (13) communicating with a central hole (49) for the thermal spray material communicating with a central hole (4d) in the injector gas mixing block (13). The device according to any one of claims 20 to 20. 22. A radial annular groove (20) for the secondary heating gas and a radial annular groove (20) for the secondary heating gas in the end surface (78) of the primary combustion chamber casing (29) near the gas mixing block support (14). Each having one annular groove (21), said both radial annular grooves being a gas mixing block support (14).
Device according to any one of claims 10 to 21, which is in communication with a radial annular groove (18, 60) for an iso-medium. 23. Radial annular groove (20) for secondary gas
And corresponding radial passages (23, 79) extending from the radial annular groove (21) for the secondary heated oxygen, which passages meet in one radial annular groove (25) forming an injector gap. In this case, the passage (7
9) Open directly into said radial annular groove (25), and passages (23) open into said radial annular groove (25) via injector pressure nozzle holes (24). 23. The device according to any one of 10 to 22. 24. The passage (79) for the secondary heating gas is at least partly formed by the gap between the primary combustion chamber casing (29) and the cap-shaped sleeve portion (80). 24. The device according to any one of 10 to 23. 25. A plurality of secondary gas mixture pores (4) extending axially and converging from a radial annular groove (25) as a starting point.
Device according to any one of claims 10 to 24, wherein 4,45) lead to a secondary combustion chamber (23). 26. The device according to claim 10, wherein the secondary gas mixture pores (44, 45) are led over the primary combustion chamber (28). 27. The device as claimed in claim 10, wherein a secondary expansion nozzle body (39) is connected to the secondary combustion chamber (32). 28. An inner screw sleeve (34) and an outer screw sleeve (35), wherein the cooling water feed passage (1) starts from the connection passage (1a) of the used component connection block (9) and passes through the gun base body (12). ) To the radial hole (40) of the expansion nozzle ejection hole (43) and then to the cooling water return passage, where the cooling water passage is the secondary expansion nozzle body (39) and the inner screw sleeve. (34) extends to an annular chamber (33) for returning cooling water, from which a cooling water passage (7d) is connected to a cooling water returning connection passage (7) of the used component connection block (9). 28. The device according to any one of claims 10 to 27, which has reached 7a). 29. The primary combustion chamber casing (29) is configured as a secondary injector gas mixing block.
29. A device according to any one of claims 10 to 28. 30. Apparatus according to claim 29, wherein the primary combustion chamber (28) of the primary combustion chamber casing (29) has a primary expansion nozzle hole (30).