US1791012A

US1791012A - Ments

Info

Publication number: US1791012A
Authority: US
Publication date: 1931-02-03
Anticipated expiration: 1948-02-03

Description

W. R. RAY

Feb. 3, 1931.

OIL FEEDING AND REGULATING DEVICE- FOR OIL BURNERS Filed April 9, 1928 2 Sheets-Sheet l INVENTOR.

fn l BY l f r'//K ATTORNEYS.

Feb. 3, 1931. w R- RAY 1,791,012

OIL FEEDING AND REGULATING DEVICE FOR IL BURNERS Filed April 9, 1928 2 Sheets-Sheet 2 INVENTOR.

ATTORNEYS.

Patented Feb. 3, 1931 UNITED STATES wiLLiAm n.' BAY, or sAN irnANcrsoo, cALrronNu, Assieme., 'BY nenn Ass-ien.'

MENTS, T RAY BURNER COMPANY, 0F SAN rIoN or DELAWARE on. manine AND REGULATING nnvicn' 'non on. nu I I Appiicatiun med pnl e, 192s'. serial mi. 263,438.

In t e operation o? automatic oil burners of the atomizing type, whether rotary, pressure actuated or otherwise, it is common practice to automatically ignite the oil when the burner is started by means of a gas ilaine, an

electric spark or the like.

To insure ignition of the oil during the starting operation, it is necessary to adjust the burner so that a rich mixture is obtained, and it is later necessary to readjust the burner valve so as to reduce the oil feed or mixture, as incomplete combustion would otherwise result.

It is accordingly desirable, especially when fuel oils of heavy gravity are used, to increase the oil supply during the starting operation in order to produce a rich mixture, 2o thus making ignition prompt and positive. It is furthermore desirable to maintain this rich mixture until the temperature of the furnace or lire box is high enough to sustain combustion, when the mixture may be reduced to normal to insure a clear and smokeless flame.

It might also be stated that the rateof flow of heavy gravity fuel oils through pipe lines, valves, etc., before reaching the burner or zone of-combustion, depends to a large extent upon surrounding temperatures. Fpr instance, if the boiler or furnace room is fairly cool before the burner is started, the oil will be thick and viscous and the flow or quancomparatively small. Conversely, as the temperature in the boiler room rises the oil pipes will become warmer and the oil iow will increase and the burner valve will accordingly require adjustment, both before and after starting.

The object of the present invention is to provide an oil feeding end regulating mechanism operable in conjunction with a burner ofthe atomizing type, which will. automatically increase the pressure on the oil line so as to insure a rich mixture during the starting operation; to provide a mechanism of this character which will maintain the pressure 5 and accordingly a rich mixture until the fire tity of oil delivered to the burner will be box and furnace room reach a proper temperthis character which will automatically reduce the pressure on the oil to a normal fire condition after the proper temperature has been attained, so as to insure a clear and smokeless fire. Y

The invention is shown by wa of illustration in the accompanying rawings, in

-which- Fig. is a diagrammatic view showing the oil feeding and regulating mechanism as installed in the oil pipe line of an oil burner.

Fig. 2 is an enlarged vertical section of the by-pass valve.

Fig. 3 is an enlarged vertical central section of lan electric motor actuated byfpass valve.

Referring to the drawings in detail, and particularly Fig. 3, A indicates a casing on the interior of which are formed two chambers generally indicated at B and C, the

chamber C being in communication with the chamber B through

discharge ports

2 and 3. The port 3 is normally closed by means of a check valve 4 which is retained on its seat 5 by .means of a compression spring 6. This spring is interposed between the valve 4 and an adjusting screw 7, and the tension of the spring may accordingly be adjusted as Will hereinafter be described. The screw extends through a plug 8 mounted in one end of the casing A, and it is enclosed by a cap 9'to prevent tampering, once the proper adjustment has been made.

'The port 2 normally remains open to permit a free flow of oil from pipe 10 through `chamber C, port 2 and into the chamber B,

and from there through a discharge pipe generally indicated at 11. Port 2 will, however, be closed by means of a valve 12 under certain operating conditions. The valve 12 is formed on the end of a stem or plunger rod 13, on the upper end of which is formed a gear rack -14 which continuously meshes with a driving pinion 15, this pinion being driven at a reduced speed through a chain of spur gears or the like,'such as indicated at 16, which are driven from an electric induction motor generally indicated at D. When a cir- FRANCIBCO, CALIFORNIA, L COR'ORL-i ature; and further to provide mechanism of cuit is closed through the motor and the rotor rotates, power will be transmitted through the gears 16 and the pinion 15 to raise the stem 13 and the Valve 12 attached thereto. During such raising movement a spring 17 is laced under com ression, this spring serving the function of closing the valve when the circuit through the motor is opened.

The motor D, together with the reduc-tion gears driven thereby, are enclosed in a housing generally indicated at E. This housing is screwed or otherwise secured to the upper end of the housing A and the two housings are sealed or separated with relation to each other by means of a flexible bellows tube 18 to prevent crude oil from entering the upper housing E. Bellows tubes of this character are generally employed, and a detail description thereof is considered unnecessary. Suffice it to say that the upper fiange of the bellows tube indicated at 19 is secured between the housing sections, while the lower ange of the bellows tube is secured to a collar 20 formed on a valve stem. A flexible seal is thus formed which permits Vertical movement of the valve stem, thereby preventing leakage of oil from one housing to the other.

The valve mechanism just described will hereinafter be referred to as the electrically operated valve. There are only two additional valves required in the system, to-wit, a by-pass valve such as indicated at F, and a regulating valve such as indicated at The by-pass valve F is best illustrated in Fig. 2. It consists of a main housing having an inlet connection 22 and a discharge connection 23. A valve seat 24 is formed in the inlet opening, and cooperating therewith is a valve 25y whichis retained on the seat by means of a compression spring 26. This spring is engaged at the opposite. end 'by' an adjusting screw 27, this screw being similar to the screw 7 previously described, being adjustable and enclosed to prevent tampergIhe valve G may be an ordinary globe or needle valve, its only function being that of regulating the oil supply to the burner.

In actual practice the valves illustrated will in most instances be connected so as to cooperate with the type of burner shown in my Patent No. 1,193,819, entitled Oil burner, issued August 8, 1916.

The type of burner disclosed in the patent referred to employs a rotary atomizing cup such as indicated at 30, (see Fig. 1) to which the oil is delivered through means of a pipe 31, the valve G controlling the. flow of oil through the pipe 31. This cup is .rotated at high speed by means of an electrical motor such as indicated at 32, the speed being suflicient to cause the oil delivered to the cup to be centrifugally projected and atomized.

The motor is driven from any suitable source f electric current supply, as by means of the

wires

33 and 34. The inductionmotor D is connected in parallel therewith through wires 33a and 34a, and a thermostat of suitable construction is mounted as at, 35. A' bimetallic type of thermostat is here illustrated. When the atmosphere is cold the thermostat member 35 assumes the position shown in Fig. 1, thereby maintaining the

contacts

36 and 37 separa-ted, but when the temperature increases beyond a predetermined temperature the contacts close and a circuit through the induction motor will be established.

The valves A, F and G are connected in the oil line as shown in Fig. 1. The oil supply is represented by a tank such as indicated at 38. A pump of suitable construction is mounted at the point 39. The suction side of' the pump is connected with the tank 38 through a pipe 40. The discharge side of the pump is connected with a pipe 41 and this delivers the oil to the valve G and the supply pipe 31 which in turn delivers the oil to the atomizing cup.

The pump under actual operation will dei-h liver a greater quantity of oil than that required by the burner, and a return pipe line is accordingly required. This return line consists of a pipe 42 which is connected with the by-pass Valve F. The pipe 10 connects with the discharge side of the by-pass valve and enters the intake of the valve A, the discharge side of the valve A being connected with the tank 38 through means of pipe 1l.

The operation will be as follows:

On a cold morning the oil is exceedingly thick and viscous and under such temperature conditions the

contacts

36 and 37 will remain separated. When the burner is to be started the circuit is closed thiougli the motor 32 and the pump 39 is simultaneously placed in operation. The spring 26 of the by-pass valve F will under normal conditions be adjusted so that it will not open to bypass oil until a pressure of approximately 30 pounds is reached. Thus, excess oil will bypass through the valve F the moment 3() pounds pressure is reached and the by-passed oil will as such reach the valve A. The valve 12 is closed under starting conditions and so is the valve 4. The spring 6 is adjusted so that it will not open until a pressure of 45 pounds is reached. The pressure 'in the pipe line will thus build up to 45 pounds before it can by-pass thro-ugh the valve 4 and return to the tank 38. In other words, a total pressure of 45 pounds will he exerted on the oil delivery line 41 and this pressure will be sufficient to deliver sufficient oil to the atomizing cup to insure a rich starting mixture.

After the burner has been in operation for a while and the temperature adjacent the burner begins to increase sufliciently to actuate the thermostat 35, this will gradually close and will finally close the circuit through the induction motor D when the contacts L36 and 37 engage. At this time the general surrounding atmosphere has increased materially in temperature and the oil pipe lines have warmed up to such an extent that the oil is liowing more freely. The moment the circuit is closed by means of the thermostat through the induction motor D, this starts rotating, and through the reduction gears 16, the pinion 15 and the rack 14, raises the valve 12. The oil entering through the pipe 10 will thus discharge freely through the chamber C, the port 2 and the chamber B, and as such will return through the pipe line 11 to the tank 38 without any material resistance, a ld the pressure on the pipe line 41 is accordingly automatically reduced 15 pounds. The normal operating pressure being controlled by the spring 26 of the valve F, and as this is set for 30 pounds pressure the normal operating pressure after certain temperatures have been reached will be 30 pounds.

-The oil flow to the atomizing cup is thus automatically decreased,"the mixture becomes leaner and a clear and smokeless lire is obtained.

From the foregoing it becomes apparent that I have provided means for automatically `increasing the pressure on the oil pipe line when starting cold and when the oil is viscous and dillicult to handle. I have similarly provided means for automatically reducing the pressure as desired when tem erature conditions become such as to permit a free flow of the oil. p

While certain features of the resent nvention are more or less speci cally described, I wish it understood that various changes may be resorted to within the sco e of the appended claims; similarly, that t e materials and finishes of the several parts employed may be such as the manufacturer may decide or varying conditions or uses may demand.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: ,t f

1. The combination with an oil burner and a pipe line for delivering oil thereto, of a pump for supplying oil to the pi e line under pressure, a by-pass return pipe ne to return excess oil to the pump a by-pass valve in the by-pass line, means for regulating the bypass valve so that it will not open and permit return of oil until a redetermined pressure has been built up in t e ipe line which suplies the burner, a secon valve in the b -pass ne adapted to be regulated so that 1t will not by-pass oil until a predetermined higher ressure has been built up in the oil supply ne to the burner, a third valve in the by-pass line and temperature actuated means for ppenin said last named valve so as to permit e oil y-passed by the rst named valve to return freely to the pump.

2. The combinationl o an oil burner, of

oil under pressure means for deliveri gbjecting the oil to the thereto, said means temperature of the surrounding atmosphere,

and means for maintainin a high predetermined pressure on the o1l when the temthe surrounding atmosphere reaches a prede-v termined normal temperature.

WILLIAM R. RAY.

Lil