GB2285062A - Detonation spraying - Google Patents
Detonation spraying Download PDFInfo
- Publication number
- GB2285062A GB2285062A GB9326211A GB9326211A GB2285062A GB 2285062 A GB2285062 A GB 2285062A GB 9326211 A GB9326211 A GB 9326211A GB 9326211 A GB9326211 A GB 9326211A GB 2285062 A GB2285062 A GB 2285062A
- Authority
- GB
- United Kingdom
- Prior art keywords
- intermediate reservoir
- heater
- barrel
- powder
- inlet pipe
- 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.)
- Withdrawn
Links
- 238000010283 detonation spraying Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 42
- 239000012159 carrier gas Substances 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000005474 detonation Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002360 explosive Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000004520 agglutination Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/0006—Spraying by means of explosions
Landscapes
- Nozzles (AREA)
Abstract
A device for use in the detonation spraying of coatings comprises a cooled barrel 1 connected to gas mixer 2 which is provided with an ignition plug 4, a cooled inlet pipe 5 being arranged to introduce a powder-like material into the barrel 1 and connected with a carrier gas pipeline 8. The inlet pipe 5 has its outlet end disposed in the barrel 1, while its inlet end 11 is connected through an intermediate reservoir 15 with a powder-like material bin 13. A main heater 14 and an electric heater 17 are respectively installed on the bin 13 and on the housing of the intermediate reservoir 15. The intermediate reservoir 15 is provided with a regulating element 21 for regulating the flow of a batch of said material introduced into the inlet pipe 5. If required more auxiliary heaters 9 can be installed in the carrier gas pipeline 8. Aluminium oxide or steel powder may be sprayed. <IMAGE>
Description
DESCRIPTION
"A DEVICE FOR USE IN THE DETONATION SPRAYING OF
COATINGS"
The present invention relates to a device for use in the detonation spraying of coatings.
More particularly the present invention relates to a device for use in the detonation spraying of a powder-like material.
According to the present invention there is provided a device for use in the detonation spraying of coatings comprising an inlet pipe which extends into a barrel and is connected with a carrier gas pipeline, said inlet pipe and said barrel being adapted to be cooled, with a gas mixer connected with said barrel being provided with an ignition plug, an inlet end of said inlet pipe being connected with a powder-like material batcher, and an outlet end of said inlet pipe, being disposed in said barrel, a bin installed in the powder-like batcher being provided with a main heater, and connecting with an intermediate reservoir, a further heater being arranged to heat said intermediate reservoir and a regulating element being arranged to regulate the flow of powder like material from said intermediate reservoir.
It is desirable that the bin be installed on a housing of the intermediate reservoir and be connected with the intermediate reservoir by means of at least one passage made in the housing of the intermediate reservoir. Further, said further heater is preferably an electric heater mounted in the housing.
The device may advantageously be provided with an auxiliary heater adapted for heating a carrier gas.
The auxiliary heater may be installed on the carrier gas pipeline. It is likewise desirable that the auxiliary heater be installed on the housing of the intermediate reservoir and be connected with the carrier gas pipeline.
In a preferred embodiment of the present invention the main heater is in the form of a hermetic casing surrounding the bin and connected with the auxiliary heater and with the carrier gas pipeline.
Such an embodiment of the present invention provides an increase in the stability of a batch of the powderlike material.
The present invention will now be further described, by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a partial longitudinal section of a preferred embodiment of a device constructed according to the present invention;
Fig. 2 is a partial longitudinal section of an alternative embodiment of the present invention;
Fig. 3 is a partial longitudinal section of a further alternative embodiment of the present invention; and
Fig. 4 is a partial longitudinal section of a still further embodiment of the present invention.
A preferred embodiment of a device for detonation spraying of coatings, constructed according to the present invention is shown in Fig. 1 of the accompanying drawings and comprises a cooled barrel 1 connected with a mixer 2 of gases by means of a branch pipe 3. In use gases, for example, 2 and C3H8, are respectively delivered into the mixer 2 in the direction of arrows A and B from sources of gases (not shown in Fig. 1), said gases forming an explosive mixture in the gas mixer 2 which is provided with an ignition plug 4.
Said device also comprises a cooled inlet pipe 5 partially disposed in the barrel 1 for introducing a powder-like material 6 into the barrel 1. Said inlet pipe 5 is connected by means of a branch pipe 7 with a pipe line 8 for a carrier gas which is, in operation, delivered into the pipeline 8 in the direction of an arrow C from a source of the carrier gas (not shown). A heater 9 adapted for heating the carrier gas is installed on the carrier gas pipe line 8.
The inlet pipe 5 has an outlet end 10 which is located in the barrel 1 and an inlet end 11 which is connected with a batcher 12 of the powder-like material 6 for spraying. The batcher 12 comprises a bin 13 which is provided with a heater 14 and connected with the inlet pipe 5 by means of an intermediate reservoir 15 defined by a housing 16 which carries an electric heater 17.
The bin 13 communicates with the intermediate reservoir 15 by means of a branch pipe 18 which is mounted on a cover 19 of the housing 16 by means of a threaded connection 20.
The reservoir 15 partially accommodates an element 21 for regulating the delivery of the powderlike material 6 into the inlet pipe 5. The element 21 for regulating the flow of the powder-like material 6, is made of a heat-conducting material and has a cross-sectional size which is greater than the diameter of a hole in the inlet end 11 of the inlet pipe 5. Said element 21 is made in the form of a stem 22 installed on the cover 19 of the housing 16 for reciprocating motion effected by means of a threaded connection 23.
The inlet pipe 5 comprises an internal pipe 24 which for part of its length is surrounded by inserts 25 and 26 which are held in contact with each other and provided with a sealing gasket 27 sandwiched therebetween, a water cooling casing 28 with a splitter 29 of water 30, surrounding the remaining portion of the internal pipe 24. A sealing gasket 31 is placed between the casing 28 and the insert 26.
The casing 28 is provided with pipe unions 32 and 33 respectively for the inlet and outlet of water in the direction of arrows D and E. An end face of the insert 25 is essentially the inlet end 11 of the inlet pipe 5 and an end of the pipe 24 is essentially the outlet end 10.
The barrel 1 comprises an internal sleeve 34 provided with the branch pipe 3 and surrounded by a cooling water jacket 35. The sleeve 34 and the jacket 35 are provided at one end with a flange 36 held in contact with the casing 28. The cooling water jacket 35 is provided with pipe unions 37 and 38 respectively which serves as an inlet and an outlet for the water 30 in the direction of arrows F and G.
This preferred embodiment of the present invention may advantageously be used for spraying heat-conducting and readily pouring powder-like materials, for example, a steel powder.
An alternative embodiment of the present invention which is similar to the embodiment of Fig.
1, is shown in Fig. 2 and is suitable for use in spraying powder-like materials which are of low heat conductance and difficult to pour, for example, an aluminium oxide powder.
The difference between the embodiments of Figs. 1 and 2 resides in the mounting of a bin 39 for the powder like material 6, (Fig. 2) on a housing 40 of an intermediate reservoir 41, the bin 39 being connected with the intermediate reservoir 41 by means of a passage 42 in the housing 40 of the intermediate reservoir 41. An electric heater 43 is mounted in the housing 40 which housing is made in the form of a solid body, and a perforated plate 53 is secured on the housing 40 on the side of the electric heater 43.
A heater 44 is also installed on the housing 40 of the intermediate reservoir 41 and is connected with a carrier gas pipeline 45 connected with the inlet pipe 5 by means of a pipe union 46.
The element 21 for regulating the flow of a batch of the powder-like material is made in the form of a shaped stem 47 which is installed in a through threaded hole of a pressure bolt 48, the stem 47 being adapted for a reciprocating motion with respect to the pressure bolt 48, by means of a threaded connection 49. The pressure bolt 48 is itself installed together with a washer 50 and a gasket 51 in the housing 40 and is adapted for a reciprocating motion with respect to the housing 40 by means of a threaded connection 52.
Another alternative embodiment of the present invention is illustrated in Fig. 3 of the accompanying drawings, the difference from the construction of Fig.
2 residing in the provision of a plurality of passages 42.
In the embodiment of Fig. 3 a hermetic casing 54 surrounds a bin 55 and is connected with the carrier gas pipeline 45, a heater 57 being adapted to heat the carrier gas by way of heat transferred from the electric heater 43.
The element 21 in Fig. 3, for regulating the flow of a batch of the powder-like material 6, is made in the form of a stem 58 with a handle 59 installed in a pressure pipe 60 which passes through the bin 55 and is partially disposed in the intermediate reservoir 41. The stem 58 is adapted to perform a reciprocating motion with respect to pipe 60 by means of a threaded connection 61. Further the pipe 60 is mounted for reciprocating motion with respect to the housing 40 by means of a threaded connection 62.
This alternative embodiment of Fig. 3 is suitable for use in the prolonged spraying of a powder-like material without the need for any additional pouring of the material into the batcher.
A still further alternative embodiment of the present invention, is illustrated in Fig. 4, this embodiment being suitable for spraying limited amounts of the powder-like material.
If the embodiment of Fig. 3 is used to spray limited amounts of powder-like material, the material will occupy a small volume inside the bin. This will lead to a through passage of the detonation products and to losses of the powder-like material due to its scattering on the side of a free surface.
The difference between the embodiments of Fig. 3 and Fig. 4 resides in the connection of a bin 63 with the intermediate reservoir by means of one passage 42.
The principle of operation of the device of the present invention as shown in Fig. 1, is as follows:
Before beginning to spray powder-like material 6 (Fig. 1), the powder-like material in the intermediate reservoir 15 and in the bin 13 is heated respectively by the electric heater 17 and by the heater 14 to a temperature equal to at least 1000C. The heatconducting stem 22 contributes to this process and also prevents spilling of the material 6 through the hole in the end 11 of the inlet pipe 5.
When the device starts to operate the barrel 1 is filled with an explosive mixture which is delivered therein from the mixer 2 through the branch pipe 3.
Simultaneously the carrier gas is delivered to the inlet pipe 5 through the heater 9, the pipeline 8 and the pipe union 7. After the barrel is filled with the explosive mixture the. ignition plug initiates detonation.
In the period of time during which an increased pressure exists in the barrel 1 the flow of detonation products containing water vapours in addition to other gases passes through the outlet end 10 of the inlet pipe 5 and through its inlet end 11 into the bulk of the powder-like material 6 filling the intermediate reservoir 15 wherein a region of increased pressure is set up and which upon expansion accompanied by cooling of water vapours, fills the volume of the intermediate reservoir 15 and partially the volume of the bin 13.
(If the powder-like material is not heated this expansion will cause condensation of vapours and agglutination of particles of the powder-like material).
Upon the drop of pressure in the barrel 1 and in the inlet pipe 5, the flow of gases through the mixer 2 is restored and the drop of pressure occurs in the intermediate reservoir 15. Expansion of the region of increased pressure in the powder-like material 6 thus ceases due to a possible release of pressure through the end 11 of the inlet pipe 5, this release of pressure being accompanied by a carry-over of a batch of the powder-like material 6 through the inlet pipe 5 into the barrel 1 filled with the explosive mixture.
Upon filling the barrel 1 the ignition plug 4 initiates detonation which then propagates in the nozzle 1 wherein detonation products heat and accelerates particles of the powder-like material 6, which after leaving the barrel 1 form the coating on the surface of a part (not shown in the drawing).
The process is subsequently repeated.
A necessary condition for effective operation of the device of the present invention, resides in maintaining a temperature of at least 1000C in the intermediate reservoir 15 to prevent condensation of moisture.
A batch of the material 6 is regulated by a clearance between the stem 22 and the end 11 determining the amount of detonation products which penetrate into the intermediate reservoir 15. A delay in admission of the powder-like material into the barrel 1 is determined by the length of the inlet pipe 5. Extent of the batch depends on the mobility of the material 6 in the vicinity of said clearance which will be substantially reduced if the material contains moisture.
The principle of operation of the device of Fig.
2 is similar to the principle of operation of the device of Fig. 1.
The principle of operation of the device of Fig.
3 is similar to the principle of operation of the device of Fig. 2. A difference does however reside in so far as before the beginning of operation, the electric heater 43 in the embodiment of Fig. 3, is switched on and the carrier gas is delivered into the heater 57. Then, after the temperature of the powderlike material 6 in the bin 55 and in the intermediate reservoir 41, has been raised up to at least 1000C, the barrel 1 is filled with the explosive mixture.
The principle of operation of the device of Fig.
4 is similar to the principle of operation of the device of Fig. 3.
The device of the present invention makes it possible to improve stability in the delivery of the powder-like material. With one and the same value of the clearance the particles possessing good mobility due to the absence of moisture on their surface provide a constant batch of the powder-like material delivered into the barrel.
Claims (7)
1. A device for use in the detonation spraying of coatings comprising an inlet pipe which extends into a barrel and is connected with a carrier gas pipeline, said inlet pipe and said barrel being adapted to be cooled, with a gas mixer connected with said barrel being provided with an ignition plug, an inlet end of said inlet pipe being connected with a powder-like material batcher, and an outlet end of said inlet pipe, being disposed in said barrel, a bin installed in the powder-like batcher being provided with a main heater, and connecting with an intermediate reservoir, a further heater being arranged to heat said intermediate reservoir and a regulating element being arranged to regulate the flow of powder like material from said intermediate reservoir.
2. A device as claimed in claim 1, in which said further heater is an electric heater, the bin installed on a housing of the intermediate reservoir and connected with the intermediate reservoir through at least one hole provided in the housing of the intermediate reservoir.
3. A device as claimed in claim 1 or claim 2, in which an auxiliary heater is provided and adapted for heating a carrier gas.
4. A device as claimed in claim 3, in which an auxiliary heater is arranged in a carrier gas pipeline.
5. A device as claimed in claim 3, in which an auxiliary heater is arranged adjacent to the intermediate reservoir and is connected with the carrier gas pipeline.
6. A device as claimed in claim 3, in which said main heater is made in the form of a hermetic casing surrounding the bin and connected with the additional heater and the carrier gas pipeline.
7. A device for use in the detonation spraying of coatings, constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9326211A GB2285062A (en) | 1993-12-22 | 1993-12-22 | Detonation spraying |
| FR9315925A FR2714623A1 (en) | 1993-12-22 | 1993-12-30 | Device for uniform detonation spraying alumina or steel powder |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9326211A GB2285062A (en) | 1993-12-22 | 1993-12-22 | Detonation spraying |
| FR9315925A FR2714623A1 (en) | 1993-12-22 | 1993-12-30 | Device for uniform detonation spraying alumina or steel powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9326211D0 GB9326211D0 (en) | 1994-02-23 |
| GB2285062A true GB2285062A (en) | 1995-06-28 |
Family
ID=26230870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9326211A Withdrawn GB2285062A (en) | 1993-12-22 | 1993-12-22 | Detonation spraying |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2714623A1 (en) |
| GB (1) | GB2285062A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999037406A1 (en) * | 1998-01-23 | 1999-07-29 | Aerostar Coatings, S.L. | Powder injection system for detonation-operated projection gun |
| US6517010B1 (en) | 1997-09-11 | 2003-02-11 | Aerostar Coating, S.L. | System for injecting gas into a detonation projection gun |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2100622A (en) * | 1981-06-23 | 1983-01-06 | Ts K Bjuro Leninskaya Kuznitsa | Barrel for detonation coating apparatus |
| GB2192815A (en) * | 1985-11-26 | 1988-01-27 | Nii Tekh Avtomobil Promy | Detonation coating device |
| WO1991012085A1 (en) * | 1990-02-14 | 1991-08-22 | Institut Problem Materialovedenia Imeni I.N.Frantsevicha Akademii Nauk Ukrainskoi Ssr | Gas-detonation installation for applying coatings |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1383583C (en) * | 1986-04-21 | 1993-10-15 | Научно-исследовательский институт технологии автомобильной промышленности | Device for depositing coatings by detonation technique |
-
1993
- 1993-12-22 GB GB9326211A patent/GB2285062A/en not_active Withdrawn
- 1993-12-30 FR FR9315925A patent/FR2714623A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2100622A (en) * | 1981-06-23 | 1983-01-06 | Ts K Bjuro Leninskaya Kuznitsa | Barrel for detonation coating apparatus |
| GB2192815A (en) * | 1985-11-26 | 1988-01-27 | Nii Tekh Avtomobil Promy | Detonation coating device |
| WO1991012085A1 (en) * | 1990-02-14 | 1991-08-22 | Institut Problem Materialovedenia Imeni I.N.Frantsevicha Akademii Nauk Ukrainskoi Ssr | Gas-detonation installation for applying coatings |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6517010B1 (en) | 1997-09-11 | 2003-02-11 | Aerostar Coating, S.L. | System for injecting gas into a detonation projection gun |
| WO1999037406A1 (en) * | 1998-01-23 | 1999-07-29 | Aerostar Coatings, S.L. | Powder injection system for detonation-operated projection gun |
| US6398124B1 (en) | 1998-01-23 | 2002-06-04 | Aerostar Coating S.L. | Powder injection system for detonation-operated projection gun |
| RU2198037C2 (en) * | 1998-01-23 | 2003-02-10 | Аэростар Коатингс, С.Л. | Powder injection system for detonating spraying gun |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9326211D0 (en) | 1994-02-23 |
| FR2714623A1 (en) | 1995-07-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |