Nozzle for spraying liquid, especially water in a snow production cannon

1. Nozzle for spraying liquid in a snow production cannon consisting of a cylindrical body ( 1 ) and a cap nut ( 2 ) having an axial spraying hole ( 5 ) connected from inside by an inlet cone ( 6 ) to a vortex chamber ( 7 ) and having a swirl insert ( 4 ) mounted between the body ( 1 ) and the nut ( 2 ) which divides a fluid supply channel ( 9 ) with a wall ( 8 ) having at least two vortex channels ( 10 ) and the axes of said channels are situated symmetrically and swirly-obliquely around the axis of the nozzle and at the same time the body, the nut and the swirl insert are threaded connection tightened through elastomeric material having flexible-elastic characteristic, characterized by that the swirl insert ( 4 ) has a flange ( 11 ) with which said insert is axially fixed between the nut ( 2 ) and the body ( 1 ) through a front ( 12 ) and a rear ( 13 ) sealing rings, and both of said rings have circular cross-section and the front sealing ring ( 12 ) is mounted in a rectangular groove ( 14 ) made on the face of the swirl insert ( 4 ) and said face is adjacent to the face of the nut ( 2 ), and the rear sealing ring ( 13 ) is mounted in a semicircular socket ( 15 ) made at the inner corner of the rear surface of the flange ( 11 ), moreover from the side of the body ( 1 ) the rear sealing ring ( 13 ) is encircled by a quadrant-of-a-circle socket ( 16 ), having a cone input ( 17 ) and in the position of tightening of the nut ( 2 ) an axial deformation Δ of the rear sealing ring ( 13 ) is from 20 to 40% of the diameter D of its cross-section, while the dimension of the gap s 2 between the faces of the flange ( 11 ) and the body ( 1 ) is no greater than the deformation Δ, in addition, the rear sealing ring ( 13 ) is made of elastomer having hardness of 60-90 IRHD and its hardness is greater than the hardness of the front sealing ring ( 12 ).

2. Nozzle according to claim 1 characterized in that position of full tightening of the nut ( 2 ) is determined by tightening the thread of the nut ( 2 ) on a thread runout zone ( 18 ) on the body ( 1 ) at the determined value of torque.

3. Nozzle according to claim 1 characterized in that the position of the full tightening of the nut ( 2 ) is determined by contact of the face of the nut ( 2 ) and an abutment flange ( 19 ) made on external surface of the body ( 1 ).

4. Nozzle according to claim 1 characterized in that the nut ( 2 ) has a fitting ( 3 ) pasted inside its cup, said fitting is made of ceramics or sintered powders and it has a spraying hole ( 5 ), an inlet cone ( 6 ) and a flange which ring face is tangent to the face of the swirl insert ( 4 ).

5. Nozzle according to claim 1 characterized in that the swirl insert ( 4 ) is made of ceramics or sintered powders.

6. Nozzle according to claim 1 characterized in that the swirl insert ( 4 ) in the axis of the wall ( 8 ) has an air nozzle ( 20 ) which is supplied by a coaxial pipe ( 21 ) the outside diameter ( 10 ) of which is less than the diameter of the fluid inlet supply channel ( 9 ) and said pipe ( 21 ) extends from the back of the body ( 1 ) to the outsides.

7. Nozzle according to claim 1 wherein the liquid is water.

8. Nozzle according to claim 1 characterized in that the nut ( 2 ) contains a cup with a fitting ( 3 ) inside the cup, said fitting is made of ceramics or sintered powders, having a spraying hole ( 5 ), an inlet cone ( 6 ) and a flange with ring face tangent to the face of the swirl insert ( 4 ).