Patent GB-742205-A (GB)
Title: Improvements in acetylene gas generators
IPC: C10H21/00
Filed: 1953-08-24
Abstract: <FORM:0742205/IV(a)/1> An acetylene gas generator as described in the parent Specification contains an additional closed chamber adapted to be partially filled with liquid, the upper portion of said chamber communicates with the gas discharge cock, a conduit within the chamber communicates with the upper part of the outer casing and terminates below the liquid level in the chamber so that gas passes from the outer casing to the discharge cock via said closed chamber and passes through the water contained therein.  The modification enables acetylene to be formed substantially free of impurities, particularly steam, and provides safety means against explosion due to the striking back of flame through the discharge cock.  A suitable form of generator comprises an outer casing fitted with a cover, an inner counter-pressure casing which has a wide open bottom, a basket for the carbide is located above the counter-pressure chamber, a member suspended from the inner portion of the cover secures the counter-pressure casing and the basket, an extended tubular member closed at the bottom is located within the outer casing and communicates at its upper end with an acetylene discharge cock on the cover, the tubular member has a lateral orifice for entrance of water when the generator is filled with water and means for closing the orifice after the water is added, a conduit which extends down within the tubular member to a point below the level of the water therein and has its upper end directed outwards through the upper part of the wall of the tubular member so that the acetylene gas passes from the outer casing to the discharge cock via the tubular member, a safety valve and a pressure gauge mounted on the cover, and an element connected to the outer casing and with which co-operates a screw for clamping the cover in position upon the outer casing to form an air-tight joint.  In this form of generator, the lower portion of the tubular member may be accommodated in a recess formed in the wall of the counter-pressure casing.  In addition, the element connected to the outer casing may be arch-shaped and the screw co-operates with a tapped nut secured in the central portion of this element, the lower end of the screw being engaged with an element fitted in a cavity formed in the cover.  Pins extending diametrically from opposite sides of the outer casing may extend through downwardly extending apertured limbs of the archshaped element referred to above and also through holes formed in brackets which are secured to the outside of the said container and serve also to receive the ends of a handle for carrying the generator.  The apparatus illustrated in the Figure is similar to the one illustrated in Specification 658,486 except that the counter-pressure chamber 28 is recessed to allow for the tubular member 25 having a closed lower end and connected at its upper end 26 with the discharge cock 23.  The tubular member 25 has a lateral orifice extending to a nozzle 34 and which may be closed by means of cover 35.  Near the top end of tube 25 is fixed an outwardly directed portion 36 of a tubular conduit 37 which is disposed coaxially within the tube 25 and extends nearly to the bottom thereof.  During operation, the container 1 is filled with the required amount of water and the tube 25 fills up to the level 38 determined by the lateral orifice 34 and is then closed with cover 35.  The basket 33 is filled with the required amount of carbide and the generator closed.  Acetylene generated accumulates in the upper portion of the generator and enters the tubular conduit 37 through orifice 36.  When the discharge cock 23 is opened, the acetylene continues its way through tubular conduit 37, bubbles through the water in the lower portion of tubular conduit 37 to the discharge cock.