DE2251122A1 - BODY OF A PLASMA GUN - Google Patents

Description

PATENT Attorney DIPL.-ING. GERD UTERMANN 71 HEILBRONN. KAISERSTRASSE 54. POST BOX II4S

(NEW COMMERCIAL BANK, OPPOSITE THE HARMONIE) O7I 31/8 28 28 TELEGR .: PATU ACCOUNTS: HANDELSBANK HEILBRONN AG, 23 O8O POSTSCHECK STUTTGART 43016

Patent and utility model S 70. 32 TJ

"- ^: " October 17, 1972

Auxiliary registration Ut / Ke

Applicant: SOCIETE EUROPEENNE DE PROPULSION

3, avenue du General de Gaulle

F-928Ö0 PUIEAUX (Hauts-de-Seine) France

Body of a plasma gun

The invention relates to a body of a plasma gun which is cast and has an axial bore for accommodating the electrodes.

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Plasma guns are increasingly used for the known metal spraying of highly heat-resistant bodies or, if the temperatures reached are high enough, for welding. These guns are operated by a user used by hand or mounted on fully automatic machines.

The previously known pistols are generally made of metal and plastic, i.e. the body of metal and the handle made of plastic. However, these pistols are very heavy and difficult to handle and the manufacturing price is very high. Moreover, their manufacture requires great and precise care both for the insertion of the electrodes as well as the associated elements, such as the lines for the supply and discharge of water, for the Electricity or the gas turning into plasma.

The invention aims to avoid the aforementioned disadvantages and to provide a plasma gun, the Body is obtained by casting and in which all associated elements are embedded in the mass.

According to the invention it is provided that also in the Plastic compound is embedded in a conduit for supplying water and electricity, which in one Annular space opens, which is formed around the axial bore and is connected to a second annular space via a channel, a line for the drainage of the water and for the electric current which leads out of a front space in which the anode is arranged and which through a channel is connected to a third annular space formed around the axial bore, and a line to the Feeding the gas, which opens into a fourth annular chamber which is formed around the axial bore.

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Thanks to this fact, the pistol can easily be mass-produced without requiring special manual labor, and it is light in weight. In addition, one lowers the manufacturing price because of the used Material considerably.

Finally, inserting the electrodes is no longer a problem, as they are in their respective bearings, the for this purpose formed during the injection process or poured in, are easy to use. There is therefore also no risk of incorrect positioning of the electrodes in relation to the connected elements,

^ dTaher

because the latter are fixed and they do not work during assembly can not move.

Further details, refinements, features and advantages of the invention are only to be found in the claims and the following in order to shorten the introduction to the description Description of a non-limiting embodiment treated.

The invention is explained with reference to the single drawing,

which shows a section through an advantageous embodiment of a plasma gun.

The body of the pistol according to the invention is obtained by casting an epoxy resin, which is possibly with Silicon dioxide is filled. All associated elements are embedded in the mass of the body, with With the exception of the electrodes, which in relation to each other depend on the gas used and turned into plasma

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must be adjusted, and with the exception of the parts that work together movably with the electrodes. So the gun body with all parts to be fastened in the gun can itself with the electrode holders be provided during the casting process of the gun body.

The plasma gun comprises a body 1 on its axis a bore 2 for accommodating the usual electrodes, such as the cathode 4 and the anode or nozzle 5 »is formed or is recessed.

The tungsten cathode 4 is connected to a sleeve 6, which in the bore 2 with the help of an adjusting screw 7 can be moved. This setting therefore allows the cathode 4 to be positioned relatively to the anode 5 depending on the gas used. The anode 5 is inserted into a space 8 which is coaxial runs to the bore 2 and is connected to this. In the space 8 is a guide or a holder 9 made of brass arranged for holding the anode 5. The seal between the chamber 8 and the external environment is established secured by a seal 3 »a conduit 10, generally formed from sheathed copper, for the supply of the cooling water and the stream is provided embedded in the bulk of the gun and flows into one first room 11. The latter is through a channel 12 connected to a second annular space 13. The annular space 13 is about openings 14, which radially on "the Circumference of the sleeve 6 are recessed, in connection with the axial bore, 2. A third annular chamber 15 is in the Body 1 formed around the sleeve 6 or recessed and is through a water duct 16 with the

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Room 8 connected, the water draining through a Line 17, which is similar to line 10 and also serves to return the electrical current.

Between the space 8 and the space 15 is in the body 1 a fourth space 18 is cut out, which also runs around the sleeve 6. One line 19 for the Supplying the gas that becomes the plasma is embedded in the mass of the body 1 and opens tangentially into the Room 18..

In the form which is intended for the manufacture of the pistol according to the invention, the spaces 13 »15 and and the channels 12 and 16 are protected against possible injection of the material forming the body by a previous filling with wax. This is shown by the cross affection. In this way the pouring of the material takes place everywhere except in the cavities, which are protected by the wax or suitable cores. In the same way, the bearing points for the seals around the mandrel are formed by interposing suitable rings. Thus, on the one hand, a seal 20 is provided between the spaces 11 and 13 and, on the other hand, a seal 21 is provided between the spaces 15 and 18. A tube 22, which is provided with openings 23, is arranged in the sleeve 6 and the rear part of the cathode 4. The seals 24 and 25 are interposed between the sleeve 6 and the tube 22 so that the cooling liquid coming out of the line and the spaces 11 and 13 between AEEN seals 25 and flows around the tube 22nd Before it leaves the front end 22a, it flows in the tube 22. Through the openings 26 which are formed in the sleeve 6 'and

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make the connection to the room 15, it flows in this. It flows through the channel 16 into the space 8 and from there into the drainage line 17.

In front of the nozzle 5, a circular ring 27 is arranged in which an inclined hole 28 is drilled, which is connected with a line 29 to a powder supply.

The connections of the various »embedded in the mass Lines are on a connection plate formed by a base plate 30 ″ of the handle 31 of the pistol formed with the aid of connection nipples 32.

Finally, on the handle or holder 31 during the Casting process also has a receptacle 33 for the thumb provided by the user so that the latter can hold the pistol well.

Such plasma guns work in a manner known per se; namely with a forced flow of a gas which becomes plasma through an electric arc which is generated between the electrodes. The guns can also be placed on automatic machines and operate continuously.

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Claims (6)

PATENT Attorney DIPL.-ING. GERD UTERMANN 71 HEILBRONN. KAISERSTRASSE 54, POSTFACH 1145 0 0 C 1 19 (NEW BUILDING HANDELSBANK, OPPOSITE THE HARMONIE) 9 O71 3I / B 2β 28 TELEGR .: PATU KONTENl HANDELSBANK HEILBRONN AG, 23 080 POSTSCHECK EUROP STUTTGART 43 70E SOOIETE ... 32 D 1 F-92800 PUTEaUX October 17, 1972 Ut / Ke- '7 Ans ρ r ü che 1. Body of a plasma gun which is cast and has an axial bore to accommodate the Having electrodes, characterized in that that also embedded in the plastic compound are a line (10) for supplying water and electricity, which opens into an annular space (11) which. around the 'axial bore (2) is formed and connected via a channel (12) to a second annular space (13), a Line (17) for the discharge of the water and for the electric current which leads out of a front space (8) in which the anode (5) is arranged and which is formed by a channel (16) with a third annular space around the axial bore (2) (15) is connected, and a line (19) for supplying the gas, which in a fourth annular chamber (18) opens, which is formed around the Axialbphrung (2). 2. body for plasma gun according to claim 1, characterized characterized in that the electrode holders are formed when the body is cast or are cast in the body. ./8th 9324/0296 S 70. 32 D 1
10/17/72 Ut / Ke 3. body for plasma gun according to claim 1, characterized characterized in that the seats for the seals in the body during casting are formed. 4. body for plasma gun according to claim 1, characterized in that it
on its handle (31) with a receptacle for the
Hand of the user is provided. 5. Body for plasma gun according to claim 1, characterized in that it has a connection plate (30) which is formed or cast during the casting process on the lower surface of the handle (31) of the gun and the connection of the lines for water and
Gas is permitted to the appropriate sources. 6. body for plasma gun according to one or more of claims 1 to 5 »characterized in that it is made of epoxy resin
is formed, which is optionally filled with silicon dioxide. 309824/0296