JPS6340587B2 - - Google Patents

Abstract

1. Snow gun having a central compressed-air supply line (1) and a pressurized-water supply line surrounding the latter and disposed coaxially therewith, the compressed-air supply line opening out into an interior space of a spray-head (7) at the front, in the direction of the compressed air supply, the space being bounded by a bored endpiece (8) and serving as a preexpansion chamber (9), inner nozzles (4) in the form of bores passing through the outside wall of the compressed-air supply line (1) being provided between the compressed-air supply line (1) and the pressurized-water supply line, through which nozzles the compressed air issues into the pre-expansion chamber (9) and mixes with the pressurized-water, characterized in that the compressed-air supply line (1) has three identical inner nozzles (4), and the endpiece has three centrosymmetrically disposed discharge nozzles (10) of identical diameter, none of which is situated in the geometric axis of the compressed-air supply line (1), and the diameter of a discharge nozzle (10) corresponds to 1 to 3 times the diameter of an inner nozzle (4).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing and dispersing snow, and more specifically, the present invention relates to an apparatus for producing and dispersing snow, and more specifically, it has a central compressed air supply line and a high pressure water supply line disposed coaxially surrounding the compressed air line. , a pre-expansion chamber bounded at the front in the compressed air supply direction by a porous end member.
This invention relates to a type of snow gun in which a compressed air supply line extends into the interior space of the spray head, which functions as a chamber.

The operating style of such a snow gun is approximately as follows. That is, creating an extremely low temperature in the pre-expansion chamber,
Ice particles form in the air-water mixture as condensation nuclei for the water to partially freeze into snow. next,
When these condensation nuclei, together with unfrozen water particles and compressed air not included in the snowmaking process, are injected through a single central opening in the end plate, the action of the condensation nuclei and further expansion of the compressed air Snow is formed in front of said central opening due to the cold air and cooling atmosphere air generated in the central opening.

Such prior art snow guns suffer from significant drawbacks resulting from the provision of a single central opening in the end plate. That is, the core of the airflow is not sufficiently atomized (i.e., does not mix well with water) and therefore does not fully participate in the conversion to snow, and therefore the kinetic energy of the airflow is not fully utilized. In addition to wasting the potential cooling power of the current, the noise is excessive and the range of use of the device is severely restricted. Inadequate or insufficient mixing of air and water may also result in the ejected jet being encased in a sheath of water droplets that condense in front of the end plate opening and fall to the ground as water. bring. That is, energy is used to accelerate water that does not convert into snow.

From this point of view, the energy waste is all the more unacceptable, since in any case a considerable amount of energy is used in order to utilize as much of the cooling potential of the ambient air as possible by enlarging the ejection area.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a snow gun which provides much better energy utilization and is much less noisy than conventional snow guns by increasing the amount of outside air added to the mixing and condensation process.

To this end, in a snow gun of the type described above according to the invention, the end member has at least three centrosymmetrically arranged discharge nozzles.

Preferred embodiments of the invention will now be described with reference to the accompanying drawings.

A compressed air supply line 1 is connected to a compressed air duct 2 connected by suitable means to a compressed air source (not shown).
Pass it inside. The front end of the compressed air duct 2 is plugged with a plug 3. Three laterally open internal nozzles 4 are also provided in the compressed air supply line 1 and communicated with the compressed air duct 2. The axis of the internal nozzle 4 forms an acute angle with the axis of the compressed air duct 2 and thus of the compressed air supply line 1. Adjacent to the plug 3 there is provided a collar or baffle plate 5 which is perpendicular to the axis of the compressed air duct 2 and thus the compressed air supply line 1 .

A jacket 6 of a high pressure water supply line is disposed coaxially with the compressed air supply line 1, and the inner thread 6a of the jacket 6 is engaged with the outer thread 7a of the spray head 7. When the spray head 7 is fitted into the jacket 9 in this manner, the inner wall of the spray head 7 and the end member 8 form a pre-expansion chamber 9. The discharge nozzle which communicates the pre-expansion chamber 9 with the outside air consists of three centrally symmetrically arranged holes 10, all of which are located off-axis of the compressed air supply line 1. hole 10
may be provided in a desired number instead of three, but none of them must be located on the axis of the compressed air supply line 1.

For devices with three identical diameter discharge nozzles and three identical internal nozzles, the diameter of the discharge nozzles is 1 to 3 times the diameter of the internal nozzles. If there are more than three discharge nozzles and more than three internal nozzles, the cross-sectional area of one discharge nozzle divided by the number of discharge nozzles is the internal cross-sectional area of all internal nozzles. Equals divided by the number of nozzles.

The snow gun of the present invention described above differs from the prior art snow gun in that the plurality of holes are arranged offset from the axis of the compressed air supply line, and the two exhaust holes are arranged to be offset from the axis of the compressed air supply line. Since the water is blown along the jets and mixed with these jets relatively near the nozzle, it is possible to mix water and air quite well.

[Brief explanation of the drawing]

The figure is a partial perspective view showing the configuration of the present invention. DESCRIPTION OF SYMBOLS 1... Compressed air supply line, 4... Internal nozzle, 7... Spray head, 8... End member, 9...
...Inner space, 10...pores.

Claims (1)

[Claims] 1. A central compressed air supply line, a high pressure water supply line coaxially surrounding the compressed air supply line, and an interior that is attached to the high pressure water supply line at one end and serves as a pre-expansion chamber. characterized by comprising a spray head containing a space and a porous end member attached to the other end of the spray head, bounding the interior space and containing a number of at least three centrosymmetrically arranged discharge nozzles. A snow goose. 2. The three discharge nozzles have the same diameter;
Claim 1, characterized in that three identical internal nozzles are provided forming part of the compressed air supply line and interconnecting the compressed air supply line and the high pressure water supply line. snow geese. 3. The snow gun according to claim 2, wherein the diameter of the discharge nozzle is 1 to 3 times the diameter of the internal nozzle. 4. more than three said discharge nozzles and more than three internal nozzles forming part of said compressed air supply line and interconnecting said compressed air supply line and said high pressure water supply line; Nozzle 1
Claim 1, characterized in that the cross-sectional area of all internal nozzles multiplied by the number of discharge nozzles divided by 3 is equal to the cross-sectional area of all internal nozzles divided by the number of internal nozzles. Snow goose as described in section.