Patent GB-979946-A (GB)
Title: High-pressure spraying pipe apparatus
IPC: B07B1/55
Filed: 1963-01-18
Abstract: 979,946. Spraying apparatus. P. HAMMELMANN. Jan. 18, 1963 [Feb. 5, 1962], No. 2310/63. Heading B2F. High-pressure fluid-spraying pipe apparatus comprises a spraying pipe which is reciprocated by the pressure of the fluid being sprayed, the pipe being mounted for reciprocation along tubular supporting means therefor, the tubular supporting means including two parts having different diameters to bound together with the spraying pipe different cross-sectional areas of the fluid, and a control valve reversible, at each extremity of the reciprocation, by means of stops to cause the movement of the spraying pipe to be reversed. A spray pipe 1 having outlet nozzles 4 is slidably mounted on a supporting tube 2 secured between the sides 3 of a machine frame. The supporting tube is provided with a collar 9 and is stepped in the vicinity of the collar, whereby said collar forms a differential piston. The adjacent end of the spray pipe is closed by a member 8 having a valved outlet 20. In operation, water under pressure is supplied to the supporting tube via nipples 5, 6 and flows into the annular spaces 19, 21 through apertures 7, 10. With the valve 22 open, the pressure in the annular space 21 exceeds that in the annular space 19 and the spray pipe moves to the right as illustrated until the valve strikes the differential piston to close the outlet 20. The pressure in the annular space 19 then exceeds that in the annular space 21 and the spray pipe moves to the left. The direction of movement is reversed when the valve strikes an adjustable stop 12 on the supporting tube to open the outlet 20. As the apertures 7 sweep over the nozzles 4 in the course of this reciprocation, the nozzles are cleaned by the water discharged from the holes 7. The spray pipe is prevented from rotating on the supporting tube by an arm 18 thereon engaging a rail 17. In a modification, Fig. 4 (not shown), the member 8 has an inner cylinder projecting therefrom which rides on the differential piston, the annular space 19 being supplied with water from the supporting tube through the apertures 7, an annular space between said inner cylinder and the spray pipe 1, and a passageway in the member 8. The flow of water through said passageway is controlled by a throttle valve. In another embodiment, Figs. 5 and 5a, suitable for long lengths of spray pipe, the supporting tube includes a distributer member 32, to which a short cylinder 33 is fastened, and a differential piston 31. A disc 34 secured to the spray pipe, slides on the cylinder 33 and is connected to a pipe 35 of small diameter, said pipe supplying the nozzles with water. The closure member 41 carries an inner cylinder sliding on the differential piston. Water flows through channels 37, an annular space 39 and a spring-loaded three-way control valve 42 to an annular space 40, causing the spray pipe to move to the left until the control valve strikes the stop 48. This moves the control valve to a second position connecting the annular space 40 with an outlet 51, whereupon the annular space 40 empties and the spray pipe moves to the right. Finally, the valve is returned to its first position when it strikes the differential piston. In two other embodiments one end of the spray pipe slides on a supporting tube connected to a source of high pressure water and the other end is closed by an enlarged member sliding in a fixed cylinder and forming a differential piston, Figs. 15 and 16 (not shown). The enlarged member is provided with an opening, whereby water flowing through the spray pipe flows into said cylinder. The end cap of the cylinder or the enlarged member carries a valve operated by abutment members, so that when the interior of the cylinder communicates with the atmosphere, the spray pipe moves in a direction to exhaust the cylinder, whereas when the valve is closed the spray pipe moves in the reverse direction due to the action of the differential piston.