US799013A - Muffler. - Google Patents

Description

UNITED STATES PATENT OFFICE.

EDWARD R. MOFFITT, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO STANDARD MACHINE WORKS, A CORPORATION OF CALIFORNIA.

MUFFLER.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed December 10,1902. Serial No. 134,647.

v ing is a specification.

This invention has for its object to provide a means or device applicable to "engines and motors run by explosive mixtures-such as.

gas and gasolene-for destroying or suppressing the noise produced by the discharge of she exhaust products from the engine-cylin- The invention comprises certain novel construction and combination of exhaust-pipe for carrying off the exhaust products from the engine cylinder after every explosion and means for spraying or injecting water in streams into the exhaust-pipe.

- The invention embraces also certain novel construction and combination of means for utilizingthe water from the water-jacket of the engine-cylinder to spray the exhaust gases andproducts in the exhaust-pipe after the water has done service as a cooling agent.

It also-includes a novel combination and arrangement of means for introducing air into the exhaust-pipein the return stroke of the engine-piston for the purpose of preventing the water and products from being drawn back into the cylinder by'the, suction or'partial vacuum produced in the pipe by the return throw of the piston after the exhaust products have been expelled.

The invention also includes a novel construction of exhaust apparatus adapted for a double-cylinder gas-engine for boats and vessels in which the end of the discharge-pipe is submerged to close the same to the atmosphere.

The following description explains at length the nature of these improvements and the manner in which I proceed to construct, apply, and carry out the same, reference being had to the accompanying drawings, forming part of this specification.

Figure 1 represents in" elevation a'noisew suppressing device or apparatus embodying my invention for a two-cylinder upright engine, showing the principal member or section of the "exhaust-pipe in section and a portion of the nozzle-carrying section below it broken awayto contract the figure. This view is a vertical section taken through the line a as,

Fig. 2. Fig. 2 is a horizontal section taken through the line 2 c, Fig. 1. Fig. 3 is a vertical cross-section. Fig. 4 is an elevation, partly in section, of the principal upright member or section of the exhaust-pipe, the same being a view taken from the right side of the upright member seen in Fig. I removed from the horizontal section of the pipe that connects'it with the exhaust-ports of the two cylinders.

The position of the engine-cylinder is indicated in Fig. 2, where portions of the two cylinders and their exhaust-ports are shown in section.

The principal parts composing the exhaust apparatus herein illustrated are designated in the following description as the horizontal section .a, the upright section b, the spraying-chamber c, and the nozzle 61. It should be understood, however, that these terms are employed merely to identify and distinguish more readily the different parts or elements of the structure so far as their functions and operations are concerned, and I do not intend by employing these terms to limit or restrict my invention to the particular position of the parts any more than I do to their shape, form, and dimensions, as shown in the drawings. In the present arrangement, for example, the section a is provided with separate coupling-flanges and exhaust-apertures set in horizontal position for conveniently connecting them with the exhaustports of two cylinders of an upright engine, and this coupling-section is therefore set horizontally. Also the section b in this instance is the more conveniently connected to one end of the section a, and being set in upright position it necessarily is connected with the horizontal section aby a curved elbow; but asthe position or arrangement of the engine-cylinder, whether upright or horizontal, will obviously control or determine the position of the members above mentioned the terms upright and horizontal, as applied herein to those sections, are used relatively and struction or position of such parts.

For a two-cylinder upright engine having the exhaust-ports 2 3 of the cylinders A B.

are not intended to limit or restrict the conloo for each cylinder. hothspringinz from a-oentral way or passage 4, which opens through the end of the section (a in an aperture 5 of the full diameter of the passage. The apertures 6 7 in the end of these branches 8 9 are set toaline with the exhaust-ports 2 3 of the cylinders, and the passage 4: isconsequently common to the exhaust-ports. on the branches 8 9 are faced to make a tight joint with flat faces 13 14 on the cylinders, to which they are fixed by tap bolts taking through holes 15 in the flanges, and a flange 16 around the central opening at the end of the coupling takes the curved end of the upright section 6. An annular space 17 17 in the upright and horizontal sections extending from end to end for the entire length of the .eentral exhaust-passage 4: 4", but separated from it by an inner cylindrical wall 18 18*,

communicates with the water-space of the cylinder-jacket through ports 19 19 in the branches, and each of these ports, being set in line with a passage 20, opening through the outer wall of the water-jacket, connects the annular space 17 17 in the exhaust-pipe directly with the space through which circulation of water is maintained to cool the cylinders. The exhaust-pipe as thus constructed will be seen to contain both a conducting-passage for the exhaust products and a channel or passage which is an extension of the Waterjacket of the cylinder around the exhaustpipe.

In the construction which I prefer to use both sections of the exhaust-pipe are formed of concentric shells generally of a cylindrical shape and concentrically set for the greater distance in the upright section, but somewhat eccentrically in the horizontal section a, where greater width of space in the outer water-passage on one side of the center than on the other is provided for the purpose of giving a wider port or opening to register with the outlet-passage leading from the water-space of the cylinder.

In both sections the inner and outer walls are united for strength by webs or solid heads in the annular space between the two walls at the ends of the sections, and through these solid portions the openings before mentioned communicate and provide a continuous channel or passage for the water; but at the lower end of the upright section, where the passage terminates, the web 21 is perforated with a number of apertures 22 at short intervals apart around the circle. Through these outlets the water is discharged in a number of streams or jets encircling the outlet end of the central exhaust-passage and in the general direction of the escaping products from the end of the passage. At this end of the exhaust-conducting passage the water and the exhaust products are brought togr.-ther in the section 0, the internal diameter of which being greater than Flanges 10 12.

pressure.

of the water and exhaust passages. In the present construction this section a is formed of a curved elbow having a flange 23 on one end to join the discharge end of the upright section 7) and a screw-threaded socket 2a in the opposite end for coupling to it the nozzle (Z. This last-named part is of proper length to extend from the section c through the hull of the boat and terminate below the water-line. Both the degree of curvature of the elbow and the length of the nozzle are governed .by the conditions under which the engine is required to work, its position in the boat, the location of the exhaust-ports, their height above the water-line, and their distance from the stern of the boat, where the exhaust is generally discharged, to the outside through the hull. The nozzle is bent downwardly at the outer end to bring the mouth 25 in horizontal position below the water-line, and the pipe (Z is carried from the elbow cat a proper angle to keep the outer end always submerged.

The parts 0 and 1/ therefore may vary in form and in length from the construction shown in the drawings, in which I have embodied the invention in an apparatus or device for a special style of upright engine, without changing or affecting the functions of these parts or their relations to the-other parts of the complete device.

In the application of the improvements to a stationary engine the end of the dischargepipe is usually submergedin a well or cistern to discharge below the surface of the water. To prevent the water and exhaustproducts from being drawn back into the cylinderspace during the return throw of the pison. provision is made for destroying the partial vacuum in the exhaust-pipe by admitting air from the outside to the central passage 4 through an inlet-aperture controlled by a valve. This inlet 26 is arranged between the chamber C and the exhaust-port of the enginecylinder and is usually carried from the outside through the web or solid metal at the end of the upright section of the exhaustpipe, and the valve 27 is arranged to open inwardly and uncover the aperture by atmospheric Provision is made also for regulating the flow of the water from the waterjacket into the passage surrouinling the exhaust-passage by a swinging valve or gate 25 in the passage adjacent to the outlet-aperture in the shell or body of the water-jaurket. This position of the gate is shown in Fig. 1 and is also indicated by dotted lines in Fig. 2. The gate is turned axially by a stem 28, extending through the top of the pipe and having a square head to take a wrench.

From the above description it will be seen that the essential features of my invention consist in discharging the exhaust products from the engine-cylinder into a chamber or the central passage 4 4 gives an enlarged space confined space of larger area than the disor chamberimmediately under tlieoutlet ends i charge-pipe; also, in closing this chamber or 3 space to the atmosphere by submerging an outlet-pipe leading therefrom in a body of water; also, in utilizing the Water from the water-jacket of the engine-cylinder for spraying the exhaust products; also, in admitting atmospheric air into the exhaust-passage leading from the engine-cylinder to the spraying-chamber during the return throw of the engine-piston. v

Having thus fully described my invention, what I claim as new therein, and desire to secure by Letters Patent, is i 1. The combination with an explosive-engine, of an exhaust-conduit connected with the exhaust-port thereof, the conduit having its end submergedbeneath a body of water, and an air-valve in the exhaust-pipe operated upon the return stroke of the engine, substantially as set forth.

2. The combination with an explosive-engine, of an exhaust-conduit connected with the exhaust-port thereof, a channel or passage connected with the water-circulating space of the engine-cylinder, a chamber into which the gases of combustion and water are discharged, a pipe leading from the said chamber having its ends submerged beneath a body of water, and an air-valve in the exhaust-pipe operated by the engine to admit air therein and to prevent the backflow of water into the exhaust-chamber ot' the engine, substantially as set forth.

3. The combination with an explosive-engine, of an exhaust-pipe connecting with the exhaust-port of the engine-cylinder, and having a passage for the exhaust products from the cylinder and a separate passage connecting with the water-circulating space of the cylinder Water-jacket, a chamber at the end of said exhaust-pipe common to both of said 40 passages, the outlet end of the exhaust-passage opening into said chamber and the waterpassage terminating in jet-apertures adapted to deliver the water in streams around the outlet end of the exhaust-passage, means for regulating the flow of the Water through the water-passage, and an outlet-pipe from said chamber. 1 j

4. The combination of an exhaust-pipe having a central exhausl'l-conducting passage and 5 a water-conducting passage separated from each other, said passages being adapted for connection respectively with the exhaustport and with the water-jacket of the enginecylinder, a chamber at the end of the exhaust- EDWARD R. MOFFITT.

'Witn esses:

A. K. DAGGETT,

EDWARD E. OSBORN.

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