SU956917A2 - Ejecting apparatus of flue mainly for locomotives - Google Patents

Description

(54) CHEMICAL PIPE EJECTOR DEVICE, MOSTLY FOR LOCOMOTIVES

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The invention relates to mechanical engineering and relates to a device for exhausting flue gases, for example exhaust gases, locomotive devices and supplying air to them for enhancing thrust.

According to the main author. St. No. 756139 a chimney ejecting device is known, mainly for locomotives, containing a cone-shaped nozzle, covering a chimney with the formation of a confusing chamber, in which vertical guide ribs are located, with curvilinear planes smoothly adjoining the outer side of the latter at an acute angle to each other, and the lower plane is inclined in the direction of the ejecting stream 1.

The disadvantage of this device is the presence of schuma during its operation.

The purpose of the invention is to reduce the noise level.

This goal is achieved by the fact that the vertical guide ribs are hollow and their cavities communicate with a cavity formed by curvilinear planes and a chimney, and in the cavity formed by curvilinear planes, partitions are installed that divide it into resonant compartments.

FIG. 1 shows the ejection device of the chimney; in fig. 2 - the same

 view from above; in fig. 3 is a section A-A in FIG. 2

The ejection device of the chimney contains a cone-shaped nozzle 1, which encloses the pipe 2 with the formation of a confining chamber 3, in which there are hollow vertical and profiled guide edges 4 and 5, respectively. On the lower and upper edges of the nozzle 1, the curved lower 6 and upper 7 planes are fixed, smoothly mating with the outside of the latter at an acute angle to each other, with the lower plane inclined in the direction of the ejecting air flow and together with the surface of the roof 8

20, the tapering channel 9. The nozzles 1 are positioned so that its upper edge is below the cut-off of the pipe 2. The profiled guide edges 5 are located under the lower curved surface 6, and the hollow guide edges 4

communicated with the cavity formed by curvilinear planes 6 and 7 and chimney 2. In the cavity formed by curvilinear planes 6 and 7, partitions 10 are installed, dividing it into a number of resonant compartments tuned to specific frequencies of the noise-output spectrum.

The device works as follows.

When the locomotive moves, the oncoming air flow flows around the curved lower 6 and upper 7 planes, as well as the guide ribs 5, and enter the converging channel 9. The ejection effect is created by increasing the air velocity in the converging channel 9 and due to the vortex of the flow by the vertical direction of the FRESH ribs 4. In this case, under the lower plane 6, an excessive pressure of air is created, and above the upper plane 7 - a reduced pressure, which causes air to flow in the gap between the nozzle 1 and the pipe 2, which forms the air jacket. By interposition of the chimney 2 relative to the nozzle 1, so that the pipe cut is located above the upper ratchet nozzle 1, the vertical direction of the air jacket is achieved.

The flow of exhaust gases through pipe 2 is accompanied by the emission of noise due to the working process of the locomotive power plant. When the gas passes through pipe 2, its oscillations propagate through the hollow vertical ribs 4 to the resonant compartments formed by the lower 6 and upper 7 planes. The combination of such a compartment and a channel formed by a hollow vertical guide edge 4 forms a Helmholtz resonator, reducing the sound level of a certain frequency. By dividing the cavities 10, formed by planes 6 and 7, into a number of different compartments, followed by their connection by hollow ribs, a reduction of the emission noise is achieved in a wide frequency range.

Claims (2)

1. The ejecting device of a chimney, mainly for locomotives, according to the author. St. No. 756139, characterized in that, in order to reduce the noise level, the vertical guide edges are hollow, and their cavities communicate with the cavity formed by curvilinear planes and chimney. 2. A device according to claim 1, characterized in that in the cavity formed by curvilinear planes, partitions are installed that divide it into resonant compartments. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 756139, cl. F 23 L 17/10, 1978. / V. / X // // : t fug.  I H