Heating – Work chamber having heating means – Work chamber having gaseous material supply or removal...
Patent
1986-10-03
1988-01-26
Dority, Jr., Carroll B.
Heating
Work chamber having heating means
Work chamber having gaseous material supply or removal...
431 1, 431 90, 432 25, F23C 1104
Patent
active
047214589
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a gas feeding device for feeding multi-component combustible gas mixture into a combustion chamber. in installations for a thermal deburring of work pieces an unconcentrated sputtering occurs, whereby the total work piece is subjected to a heat shock. Preferably, the corners and edges are sputtered, because these locations absorb particularly a great deal of heat with a large surface and a small volume and are thereby oxidized or burnt. The heat shock is generated by burning off a combustion gas-oxygen mixture, whereby hydrogen or natural gas or methane is used as a combustion gas. The amount of gas in the combustion chamber and the admixing ratio of the gas components are available for controlling the deburring process. These two values of influence determine the amount of energy and the temperature. In each case metals are deburred with an excess of oxygen, because otherwise only a melting off but no burning off of the burs would occur. The more oxygen is present in the combustion chamber, the more intensive is the deburring effect with respect to radial formations and the amount of deburring.
In known deburring installations the gas admixing components are at first fed from supply containers into a dosaging cylinder and subsequently are pushed into the combustion chamber by means of a piston in the dosaging cylinder. This process may be repeated frequently for a pressure build up in the combustion chamber. The piston stroke is steplessly adjustable, however is uniformly large for combustion gas and oxygen. The pressure in the dosaging cylinders is divided through reduction valves in the feeding lines and is independently adjustable. For example, with the assistance of these reduction valves the pressure of bot gas components can be varied from 0 to 20 bar. The parameters to be adjusted are differently dependent from form, size and material of the work pieces to be deburred and must be determined by means of tables or if this is not possible empirically. Thereby the operator must bring three values, namely the filling volume of the dosaging cylinders, the filling pressure in the oxygen cylinder and the filling pressure in the combustion gas-dosaging cylinder, to a ratio with each other to obtain optimal results.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved gas feeding device for feeding multi-component combustible gas mixture into a combustion chamber.
In contrast to the above described conventional devices the gas feeding device in accordance with the invention is advantageous in that the gas mixing components can be fed from the supply containers through the feeding lines directly into the combustion chamber or into a mixing chamber which is positioned before the feeding device. Thus, an expensive dosaging device with dosaging cylinders and gas pushing pistons is omitted. Furthermore, the gas feeding device in accordance with the invention is advantageous in that the operator must only preselect two values, namely the mixing ratio in the control circuit and the amount of gas at a storage and counter stage, so as to generate different amount ratios or mass ratios of the gas components. The gas component which represents the leading dimension can be fed into the combustion chamber with a constant pressure and in different amounts, while the second gas component is automatically fed in a defined amount which is dependent from the adjustment of the control circuit. The amount of the fed gas and thereby the combustion filling pressure is determined by the time span which passes between the opening of the shut off valves and the closing of the same caused by a signal from the storing or counting stag, while the mixing ratio of the gas components is predetermined by the adjustment of the control circuit. Hence, this is a superposition of a measuring process of the amount of gas and a control process of the mixing ratio of the gas components. The simplification of the filling process is in particular ad
REFERENCES:
patent: 4474547 (1984-10-01), Drexel et al.
patent: 4591339 (1986-05-01), Conrad
Dority Jr. Carroll B.
Robert & Bosch GmbH
Striker Michael J.
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