US2012794A

US2012794A - Fluid fuel burner muffler

Info

Publication number: US2012794A
Application number: US690186A
Authority: US
Inventors: Walter W Williams; Philip A Celander; Nesmith Oliver Earl
Original assignee: Williams Oil O Matic Heating Corp
Current assignee: Williams Oil O Matic Heating Corp
Priority date: 1932-12-27
Filing date: 1933-09-20
Publication date: 1935-08-27
Anticipated expiration: 1952-08-27

Description

wwI WILLIAMS Er AL. 2,012,794

FLUID FUEL BURNER MUFFLER Aug. 27, 1935.

Original Filed Dec. 27, 1952 i N11 :i \\\\\I Q Q Illlmh lmln Patented Aug. 27, 1935 UNITED STATES PATENT OFFICE FLUID FUEL BURNER MUFFLER Walter W. Williams, Philip A.

Celander, and

Oliver Earl Neamith, Bloomington, Ill.: said Celander and said Nesmith assignors of their entire right to Williams Oil-O-Matic Heating Corporation. Bloomington. IIL,

of Illinois a corporation 2 Claims.

This invention relates. to improvements in electrically operated uid fuel burners of the domestic type for installation with heating plants of homes and buildings, and more particularly to the-construction of an air mumer for use therewith.

It is an object of this invention to reduce the noise of operation in uid fuel burners of this type occasioned by the passage of air from the surrounding atmosphere into the compression pump. With this object in view, reference is made to the accompanying sheet of drawings which illustrate a preferred form of this invention with the understanding that minor detail changes may be made without departing from the scope thereof.

In the drawing:

Figure 1 is a view in side elevation of a commercial type of domestic fluid fuel burner with parts broken away, illustrating the air muiiier in central vertical section.

Figure 2 is an enlarged detail view in similar section of the air muffler cap.

Figure 3 is a view in side elevation of Figure 2, looking at the left side thereof.

The embodiment of this invention is illustrated in connection with a commercial type of fluid fuel-burning mechanism for domestic heating purposes of the same general type as illustrated in the W. W. Williams Patent No. 1,817,051, August 4, 1931. The embodiment illustrated includes a base I, which supports an integral fan blower casing or housing 2 having an extension for receiving and mounting the electric motor 3. The other side of the motor is provided with a cover or an end bell 4 secured to the casing. The motor is provided with a driving shaft l for operating an oil pump and also operating a fan blower. The driving shaft 5 is extended through the end bell 4 on the side of the motor for operating a. compression pump 6 and metering pump mounted, not shown, upon the end bell. The general construction and operation of the pressure pump and metering pump is of the type disclosed in the W. W. Williams Patent No. 1,451,798, granted April 17, 1923.

The pressure pump 6 draws atmospheric air into the pump chamber through an air muiiler, including a casing 1 mounted on the casing upon the pressure pump 6, as shown in Figure 1. The casing 1 is preferably cylindrical in shape with an annular passageway 8 about a concentric baille 9. The casing 1 is provided with a similar shaped cover I0 and a corresponding annular passageway 8 and corresponding cylindrical baille l. A

flexible diaphragm II is positioned between the contacting surfaces of the casing 1 and cover I0, which cover is drawn tightly upon the casing by a plurality of screws I2. This flexible diaphragm is shown in the enlarged detailed view, Figure 3, in which the outline of the casing 1 is indicated in dotted lines and likewise the outline of the cylindrical baiiie 9 is shown in dotted lines. This diaphragm is referably made of a treated heavy exible paper, such as that commercially known as Karrapak, The cover I0 is provided with a central opening I3, which supports an air intake tube I4, which passes through the diaphragm II and opens into the casing 1, within the cylindrical baille 9. The diaphragm is provided with a plurality of apertures I5, which allow the air drawn through the tube I4 to pass from the chamber within the baiile 9 through the diaphragm into the corresponding chamber 9 in the cap. The wall of the cylindrical baiile of the cap is provided with one or more apertures I6, opening into the annular passageway iia in the cap and the diaphragm is provided with a plurality of apertures I1, forming a means of communication between the annular passageways 8a and 8 in the cap and casing. The annular passageway 8 in the casing is provided with a passageway I8 leading to the intake I9 of the pressure pump, which passageway is preferably provided with a ball check valve 2li.

By this construction, when the motor starts the operation of the pressure pump, atmospheric air is drawn through the opening I3 in the muler cap, passes through the tube I4 into the chamber 9b formed by the cylindrical bale 9 and diaphragm I I, passes through the apertures I5 in the diaphragm into the similar chamber Sic on the other side thereof, then throughthe aperture I6 into the annular passageway 8l about the exterior of the cylindrical baille ila in the cap and then through the apertures I1 in the diaphragm into the annular passageway 8 in the casing 1 upon the exterior of the cylindrical baffle 9, through the passageway I8 leading therefrom, lifting the ball check valve 20, and enters the intake I9 of the pump. It has been found that by this construction the atmospheric air is drawn into the pressure pump at a. constant rate, with little or no noise. The diaphragm I I is easily and readily replaced. The pressure pump rotates at a very high rate of speed and as the diaphragm is of soft, flexible material, the air passing through and about it at a high rate of speed is muffled. The check valve is provided to prevent the pump from forcing oil out through the muiiler in the event that the discharge side of the pump, or any of the parts leading therefrom, become clogged or stopped up. The air passes through the diaphragm twice on its way to the pump, sets up a vibration in the diaphragm, which, on account of its composition, is noiseless.

This application is a division of the joint application led by Walter W. Williams, Philip A. Celander, and Oliver Earl Nesrnith, Serial Number 648,965, filed December 27, 1933, for improvements in Electrically operated fluid fuel burners.

What we claim is:

1. A device for muiiling the intake of an air pump including means for admitting air to said pump and a muler casing about the exterior of said intake having a perforated flexible diaphragm and a plurality of baiiles arranged to cooperate with the perforations of the diaphragm to pass the air drawn into the pump back and forth through the flexible diaphragm.

f 2. Adevice for muiliing the intake of an air pump including a casing about said pump provided with an air intake passage, a muiiler mounted upon said pump casing communicating with said intake passage comprising a cylindrical muler casing having a concentric baille therein forming an annular passage, a connecting passage provided in the muflier casing from the said annular passage to the said pump intake passage, a check valve in said muler casing passage permitting air to pass therethrough to said pump, a cap secured over said muiller casing having a registering concentric baile and an axially disposed passage therethrough with a iiexible diaphragm secured between the contacting parts of the said cap and muiiier casing and engaged by the said oppositely disposed similar concentric bailles, said cap having an axially disposed passage therethrough and supporting on the interior a concentric intake tube passing through said diaphragm, said diaphragm provided with perforations upon the interior and exterior of said concentric baiiles and a passage provided in the concentric baiile of the said cap opening into the annular passage thereabout, whereby the operation of the pump draws air through the mufller in a circuitous path.

WALTER W. WILLIAMS. PHILIP A. CELANDER. OLIVER EARL NESMITH.