US2515950A - Ventilating apparatus - Google Patents

Description

July 18, 1950 G. H. DINGMAN VENTILATING APPARATUS Filed Sept. 13, 1946 Fig.2.

INVENTORu GLEN H DINGMAN ATTORNEY.

Patented July 18, 1950 VENTILATING APPARATUS Glen H. Dingman, Sidney, N. Y., assignor to Bendix Aviation Corporation, New York, N. Y., a corporation of Delaware Application September 13, 1946, Serial No. 696,905

Claims.

This invention relates to ventilation, and particularly to the ventilation of machinery. It finds valuable use in the structure of magneto casings, and in the casings of exothermic machinery or of machinery that is liable to burn or to be enveloped in flame occasionally, and in such use serves a valuable protective function.

It is an object of the invention to construct a ventilator for machinery casings, adapted to a wide variety of other and similar employments, that is capable of ventilating the machinery and of releasing excess heat while restraining flame from passing through the ventilator.

Another object is to construct a ventilator capable of performing the indicated functions and of being assembled from simple parts that can be easily dismantled for cleaning.

The objects of the invention are accomplished, generally speaking, by constructing in the wall of the space to be ventilated a plurality of interconnected chambers adapted to reduce the velocity of hot gases passing therethrough without reducing their rate of discharge, having an additional flame arresting function, and constituting a pneumatic maze. A preferred structure for accomplishing these objects is described in the specification and illustrated in the drawing as a ventilator for a magneto casing, but it is to be understood that the particular use constitutes no limitation.

The above and further objects and novel features of the invention will more fully appear from the following detailed description when the same is read in connection with the accompanying drawings. ever, that the drawings are for purposes of illustration only and are not intended as a definition of the limits of the invention, reference for this latter purpose being had primarily to the appended claims.

In the drawings, wherein like reference char acters refer to like parts throughout the several views,

Fi 1 is a vertical elevation of a casing memher having a centrally located ventilator of the type described;

Fig. 2 is a vertical section on the line 2-2 of Fig. 1; and

Fig. 3 is an exploded view of the parts of the ventilator, in end elevation.

In the drawing the numeral iii indicates a section of a magneto casing wall having a slit H and a portion I2 above the slit, ofiset to provide an orifice E3 of considerable length and gas flow capacity. This orifice faces downwardly as It is to be expressly understood, howshown in the drawing but could be faced in any other direction to serve the needs of a particular construction, as for instance being faced rearwardly on a moving body to provide suction. Gas may pass to the space within the bulge i2 through the slot E3, or it may be discharged therefrom. In each instance its motion will be mainly parallel to the casing wall as it leaves the slot.

A double chamber and pneumatic maze is made by attaching over the hollow of the bulge a chamher having an inner plate i i and an outer plate l5, which are spaced apart to form a chamber It by offset edge flanges ll, ll. These plates are identical and may be conveniently made by a stamping process. In each of them is a slot, indicated by numerals l8, it, which are arranged in offset relation to each other and to the slot i3, providing a pneumatic maze that must be traversed by the gases, and orifices receiving and discharging gases in different directions.

Thus, in Fig. 2 gas travelling from left to right enters the slot [8 horizontally, suffers a degree change in direction and travels the height of chamber I6, changes direction 90 degrees to pass through slot I 8' and again 90 degrees to travel the depth of chamber E9 between bulge i2 and plate 14, being discharged at an angle to its direction of entry. This different angle of entry and discharge tends to overcome the fault that arises when inlet and outlet are identically directed and are made ineffective by equal pressure in the one direction.

The chamber I6 is of such size that the velocity of the gases that enter it from orifice i8 is reduced. The chamber i9 is of even greater size. This system of chambers is calculated to reduce the velocity of hot gases proceeding through the ventilator so that the temperature of an explosion flame will be reduced to a relatively harmless degree inside the ventilator.

In order to further provide against the passage of flame the flanges !li"l hold clamped between them a wire screen 24]. This screen divides the chamber l6 and acts as a flame barrier. It is preferably made of phosphor bronze wire cloth of about .0045 in. wire diameter having about 30% open area. This may be accomplished by a weave of about x 100 mesh, and openings of about .0055 in. Total thickness of the screen is about .009 in. plus or minus .003 in.

The chamber I5 is assembled as a unit and attached over the bulge l2 by rivets 2! Or by more easily removable bolts. The bolts are preferred in cases where the passages of the screen act as a filter and become clogged, being thus easily removed for cleaning. Screw threaded studs may be mounted on and project from the casing, upon which the chamber 16 is attached by nuts.

The advantages of the invention are material. The structure is simple, cheap to make, and easy to assemble or dismantle. It acts both as a ventilator and as a fire trap. The arrangement and size of the orifices, the directional changes in the maze, the screen and its construction, and the chamber sizes all contribute to the eflicient performance of the unit.

Although only a single embodiment of the present invention is herein illustrated and described, it is to be expressly understood that the invention is not limited thereto. Various changes may be made in the design and arrangement of the parts and in the materials used without departing from the spirit and scope of the invention, as will now be apparent to persons skilled in the art. For a definition of the limits of the invention, reference is had primarily to the appended claims.

What is claimed is:

1. Ventilating apparatus for a casing or the like comprising a Wall having a bulge forming a recess in one face thereof and a slot at one edge of said recess whereby the latter is open to the other face of the wall, a chamber assembly comprising a pair of plates havin peripheral flanges in face-to-face relation and center portions shaped to form a first chamber between the plates, and means for securing said assembly to said wall across said recess and forming the latter into a second chamber, the inner plate of said pair constituting a wall between said chambers and having a slot therein connecting said chambers adjacent the edges thereof opposite said first-named slot and the other of said plates 4 having a slot therein extending across the other edge of said first chamber.

2. Ventilating apparatus as defined in claim 1 wherein the bulge forming the outer wall of said second chamber is an offset integral part of the wall of the casing.

3. Ventilating apparatus as defined in claim 1 wherein the center portions of said plates are oppositely bulged to form said first chamber.

4. Ventilating apparatus as defined in claim 3 wherein said plates are substantially identical stampings assembled in opposed face-to-face relation with the slots therein at opposite edges of the chamber formed therebetween.

5. Ventilating apparatus as defined in claim 3 wherein the chamber assembly comprises a metallic screen extending across said first chamber and having the periphery thereof securely clamped between the peripheral flanges of said plates.

GLEN H. DINGMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,385,995 Hellmund Aug. 2, 1 921 1,420,411 Currie June 20, 1922 1,723,412 De Waters Aug. 6, 1929 1,730,237 Patten Oct. 1, 1929 1,960,259 Wyman May 29, 1934 2,150,859 Gibson et a1. Mar. 14, 1939 2,151,180 Anschicks Mar. 21, 1939 2,279,961 Whittaker Apr. 14, 1942

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