Heating – Work chamber having heating means – Combustion products heat work by contact
Patent
1986-10-09
1987-12-15
Favors, Edward G.
Heating
Work chamber having heating means
Combustion products heat work by contact
239425, 431159, F27B 300
Patent
active
047129980
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a mixing block or arrangement for a combustible gas mixture fed to a combustion chamber of a device for treating workpieces. In the particularly related known installations for thermal deburring of workpieces a chemical process occurs due to the influence of heat. The material to be deburred is oxidized with oxygen and burnt. The heat shock which is required for deburring is generated by burning off a combustion gas-oxygen mixture, whereby hydrogen or natural gas or methane may be used as a combustion gas, for example so that the required energy is released and the gas mixture must be compressed before the igniting. This is usually performed with the aid of dosaging cylinders and gas push by the pistons of the cylinders. The admixing of the gas components and igniting of the gas mixture is performed in a mixing block which contains an ignition device for igniting the gas mixture as well as a mixing chamber.
The proper igniting and rapid combustion of the gas mixture depends, among others, decisively from a good uniform admixing of the gas components in the area of location of the ignition device and the combustion chamber of the work piece finishing chamber. It is known from DE-OS No. 30 15 393 that to improve the mixture preparation in that the feeding lines for the gas components discharge tangentially into the mixing space designed as a bore of the mixing chamber. Thus, a strong twisted flow is generated and thereby an intensive admixing of the gas components. Such a mixing block is relatively volumnious and correspondingly expensive in the geometry of the feeding lines and the mixing chamber, caused by the tangential input for the gas components.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved mixing arrangement for mixing different gas components of a gas mixture to be fed into a combustion chamber of the device for treatment workpieces for example for deburring. It is a further object of the invention to provide a mixing block in which the gas flows before entering the mixing chamber are so shaped and deflected by a jet arrangement that an intimate and uniform admixing of the gas components occurs. Moreover, the jet arrangement in accordance with the invention is advantageous in that the feeding lines for the gas components and the mixing chamber are not fixed by a defined geometry with respect to their common arrangement, which is advantageous with respect to the size and the constructive design of the mixing block.
It is particularly advantageous with respect to the cost effective manufacturing and compact mode of construction that the combustion chamber of a work piece finishing chamber is used as a mixing chamber, the walls of which are provided with receptacles for the jet arrangement and for an ignition device for igniting the gas mixture. It is known from DE-PS No. 21 22 221 to use the combustion chamber of a work piece treatment chamber simultaneously as a mixing chamber for the gas components, however the feeding lines for the gas components which are shaped as parallel bores in the head portion of the treatment chamber discharge immediately into the combustion chamber, whereby the gases are insufficiently admixed. Preferably, the mixture preparation is performed by the jet arrangement which consists of a slotted nozzle feeding the gas component, preferably an annular slotted nozzle and a multihole nozzle for a second gas component directed to the gas flow discharging from the slotted nozzle. Due to this nozzle geometry the gas component discharging from the multihole nozzle is injected into the flow of the gas component discharging from the slotted nozzle. A good ignitable mixture is generated. For forming the annular slot a bore may be formed in the wall of the mixing chamber and an annular bolt made of heat resistant material may be centrically inserted therein. Such bolts are relatively small structural elements which can be simply made, and interchange of these bolts as highly stres
REFERENCES:
patent: 3666252 (1972-05-01), Rice
patent: 4125359 (1978-11-01), Lempa
patent: 4284239 (1981-08-01), Ikeuchi
patent: 4526322 (1985-07-01), Voorheis
Favors Edward G.
Robert & Bosch GmbH
Striker Michael J.
LandOfFree
Mixing arrangement for a combustible gas mixture does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mixing arrangement for a combustible gas mixture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mixing arrangement for a combustible gas mixture will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1217239