US 2325905 A
Description (OCR text may contain errors)
Aug. 3, 1943. E. CAULFIELD 2,325,905
SUPPRESSOR Filed Oct. 8. 1941 2 Sheets-Sheet 2 Iureutm' Patented Aug. 3, 1943 UNITED STATES PATENT OFFICE 2,325,905
- SUPPRESSOR Edward W. Caulfield, St. Petcrsburg, Fla. Application October 8, 1941, Serial No. 414,179
The present invention relates to new and useful improvements in exhaust noise suppressors, particularly for airplane engines, although it will be understood, of course, that the device may be used in conjunction with any other type of internal combustion engine for which it may be found adapted and desirable.
The primary object of the invention is to provide, in a manner as hereinafter set forth, a suppressor of the character described which will substantially eliminate the noise of the exhaust while creating little or no back pressure on the engine.
Another very important object of the invention is to provide a suppressor of the aforementioned character embodying a novel construction and arran ment whereby the danger of fire will be reduced to a minimum.
Still another very important object of the invention is to provide an internal combustion engine exhaust noise suppressor from which no flame will be discharged, this being a highly desirable consideration, particularly on military airplanes when flying at night.
Other objects of the invention are to provide a suppressor of the character set forth which will be comparatively simple in construction, strong, durable, highly efficient and reliable in use, compact and which may be manufactured at low cost.
All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughoutthe several views, and wherein:
Figure 1 is a view in vertical longitudinal section through a suppressor constructed in accord ance with the present invention.
Figure 2 is a cross-sectional view, taken substantially on the line 2-2 of Figure 1.
Figure 3 is a cross-sectional view. taken substantially on the line 33 of Figure Figure 4 is a detail view in rear elevation, 1ooking at the front spreader from the line 4-4 in Figure 1. V
Figure 5 is a view in side elevation of the device.
Figure 6 is a view in side elevation of the tube and rear spreader unit.
Figure 7 is a view in rear elevation of the unit shown in Figure 6.
Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises an elongated casing I of suitable metal or other material, which casing may be of any desired dimensions. The casing l includes detachably connected front and rear sections 2 and 3, respectively. Fixed in the forward end portion of the rear section 3 is a metallic ring 4. The front section 2 slips on the rear sections 3 and is firmly secured thereto by bolts 5 which are threaded into the ring 4.
The front section 2 includes a substantially tapered or conical portion 6 which terminates, at its forward end, in a neck I for connection with the exhaust pipe from the engine (not shown). Welded at 23 in the neck portion 1 and extending rearwardly therefrom in the easing section 2 is a plurality of brackets 8. Mounted on the rear end portions of the brackets 8 is a substantially conical spreader 9. The brackets 8 terminate in inwardly and forwardly bent rear end portions I0 to which the spreader 9 is secured.
The rear end portion l l of the casing section 3 is formed to provide a centrally located, forwardly protruding bell or the like [2. Mounted in the bell l2 and projecting rearwardly therefrom is a discharge neck l3.
Mounted in the front casing section 2 in abutting engagement with the forward end of the section 3 and the ring 4 is a circular, apertured metallic plate M. A bead or rib I5 is welded at 24 in the section 2 and retains the plate M in position against the forward end of the section 3 and the ring 4.
Fixed in the apertures in the plate I4 is a plurality of tapered, rearwardly converging tubes it. Mounted on the rear end portions of the tapered tubes I6 is a comparatively small apertured metallic plate H. In the embodiment shown, the plate I! has projecting from its periphery a plurality of ears l8. Mounted on the ears l8 and extending rearwardly and inwardly therefrom is ,a plurality of rods IS. A substantially conical spreader 20 is mounted on the rods I9 adjacent the rear ends of the tubes It.
It is thought that the manner in which the suppressor functions will be readily apparent from a consideration of the foregoing. Briefly, the exhaust gases from the engine enter the easing section 2, said gases striking the spreader 9 and expanding in the chamber 2i. From the chamber 2| the exhaust gases pass through the tapered, rearwardly converging tubes l6 into the casing section 3. The exhaust gases emerge from the tubes l6, strike the spreader 20 and again expand, this expansion occurring in the chamber 22. As indicated by the arrows in Figure 1 of the drawings, the exhaust gases are directed forwardly by the bell l2 into the conical spreader 20 where they again reverse and discharge through the neck 13. As will be readily apparent, access to the interior of the device may be expeditiously had by disconnecting the casing sections 2 and 3.
It is believed that. the yadventegee of a suppressor. consltriictl'ad in accordance With the present invention will'be readily understood, and
, although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in'the details of construction 7 and in the combination and arrangement of parts drical casing having an inlet in one end and an outlet in its other end, a substantially conical baflle mounted in the casing in spaced, concentric relation thereto and in longitudinal alignmentrwith the inlet, a circular apertured plate mounted in the casing rearwardly of the baiile, a plurality of imperforate, rearwardly tapering and converging tubes mounted in the apertures in may be resorted to which will fall within the'scope of the invention as claimed.
What is claimed is:
the plate, aplatemountedonthe rear. end portionsg'ci the tubes and s'pa'ced ifromfthe" casing;
integral earsradiating from thesecond-named plate, rearwardly projecting rods mounted on said ears, a substantially conical bailie mounted on said rods in spaced, o'ppo sed relation to the 'tubes and spacedjrom the casing, and a hell on -the'rear'encl-o'fthe casing for directing exhaust gases forwardly into the second-named baiiie.
' A suppressor comprising an elongated cylin V EDWARD'W. CAULFIELD.