US2111744A - Burner safety control - Google Patents

Description

March 22, 1938. o; L, B CK 2,111,744

BURNER SAFETY CONTROL Filed July 2, 1934 @axr Mays.

, Patented Mar. 22, 1938 UNITED STATES PATENT oFFicE BURNER SAFETY QONTROL Oscar L. Bock, Madison Wis, assignor Bock Oil Burner Corporation, Madison, Wis-, a

corporation, of Wisconsin Application July 2,1934, Serial Nb. 733,360

and abnormal conditions. /1

The primary object of the present invention is 10 to provide a new and improved device for supplying fuel oil to burners and controlling the flow of the oil to the burners, and which is provided with new'and novel means} for removing or draining the surplus oil, which. is s e and foolproof,

15 and which is so constructed-an arranged so that the device will operate positively and efllciently.

Another object of the invention is to provide improved means for controlling the flow and overflow of oil to the burner by providing asump in which certain mechanism is controlled by the oil level therein and which is so constructed and arranged that the customary or conventional ex posed overflow drip buckets to operate shut-d means may be eliminated.

25 A still further object of the invention is to provide a new and novel control device, which is provided with means for controlling the supply of fuel to the oil burner, which is provided with new and novel cut -out means, which has means for 30 collecting the overflow as well as providing shutoff means, and which is constructed and arranged to permit for the reception of excess fuel supplied to the burner as-well as providing means for draining the-device either by the removal of a 35 sump or by the operation of a conveniently located and efficiently operated valve, depending upon whether or not the sump is to be connected by a return line from the burner.

Numerous other objects and advantages will be 4 apparent throughout the progress of the following specification.

The accompanying drawing illustrates a selected embodiment of the invention and the view shown therein is a detail sectional elevation 45 through a device and burner showing the various parts in a practical arrangement. l

The specific arrangement and construction herein shown, for the purpose of illustration, comprises a fuel supply tank i containing a hy- 50 drocarbon such as fuel oil which feeds through a supply pipe 2 through a strainer 3 operatively arranged in a supporting housing 4. A connecting nipple connects the inlet and strainer housing d to the chamber housing 6. Fuel oil from the 55 supply source I passes through the feed line 2 into the housing 4 where it is strained by the strainer 3 and then passes through the nipple 5 and through the restricted opening I formed in the supporting or coupling member 8. This latter member 8 is provided with a longitudinal or 5 vertical bore 9- into which there is arranged for operation a, valve l0. Ports ll communicate with the opening I to supply 011 to the chamber withinthe chamber housing 8. The oil level rises in the chamber and raises the float l2 which, when ris- 10 ing, causes the needle valve in to be seated against. the inlet opening I and shut off further fuel supply. After sufilcient fuel oil is drawn oil from the chamber, the-float i2 will again lower and cause the needle valve to again become unseated and permit further supply of fuel ,oil. The oil flows out of the chamber outlet i3 and through the burner feed line It to the burner it. A metering device i6, either manually or electrically controlled, (electrical control being shown) may be interposed in the line H as shown in the drawing. The oil coming through the line H is fed to the burner bowl where it flows to the lower surface and is burned. In case of flame failure or extinguishment, the levelof the oil in the bowl will rise to the lower row of holes ii in the flre pot idwhere it will flow into the outer bowl l5 and then through the return line IE to the sump 2t.

As previously mentioned, the valve ill is controlled by the float 12 so as to maintain a constant level of oil in the'chamber 6. As the oil level rises in the chamber, raising the float l2, the needle valve ill will be depressed due to the action of the float i2 engaging the hinged lever arm ii; The hinged lever arm 2| is pivoted at 22 and'has its free outer end 23 operatively connected to a part 24 on the valve ill to positively raise and lower the needle valve in conformance with themovement of the float I2 and maintaining a normal constant level within the chamber 6. However, in case of faulty operation and should the level of the oil in the chamber rise, it will flow over a spillway 26 into the lower sump 20. As the oil continues to rise in the sump 20, due to the overflow of the chamber 6, a float 26 arranged'in the sump 20 will rise. An arm 2'! fastened to the float 26 is pivotally connected to a transverse rod or lever28 as indicated at 29. This transverse lever 28 is pivotally mounted as indicated at 30. As the fuel level in the sump 20 raises the float 26, the arm 2'! and the lever 28 will be operated and unhook the dog 3| from its engaging arm. 32 whichis pivoted at- 33. A spring 34 normally urges the engaginglarm 32 in a downward direction and normally holds the dog into engaged position with the arm 32. When the float 26 rises to swing the lever 28 on its pivot 30, the dog 3| will become disengaged and the spring 34 will. cause the needle valve III to be depressed against its seat I and thereby shut off the feed of fuel to the chamber 6.

To again put the device in operation, the 011 must be drained from the sump so that the float 26 will fall to a lower position and allow the engaging arm to be reset and again take the weight of the spring 34 off of the needle valve ID. This latter operation is done by pulling down on the valve pin 35 to compress the spring 36 to unseat the needle valve 31 from its seat 38 and permit the oil to pass from the sump through the orifice or drain opening 39. The oil will then flow out of the sump through the needle valve,

opening 39 which is drilled in the valve body 40. When the pin or needle valve 35 is released, the spring 36 will drive the needle valve 31 against its seat preventing further discharge 1 oil until the stem 35 is again pulled downwar y. When the oil is drained as low as possible through this latter described means, a small amount of the fuel will remain in the burner outlet l9 and in the trap connection designated generally by the numeral 4|. The burner drain l9 and the connection 4| act to prevent air and gases from being blown back into the control device when the burner is operating and where pressure is around the inner burner bowl as would be the case when a motor driven blower is attached to the outer burner housing l5. It is apparent that gases might be forced back from the bowl l8 through the connecting pi l9 into the sump 20 and escape into the room if it were not for the liquid seal between the burner and the device, the liquid seal being the fuel oil in the trap 4| and the pipe line l9.

In some cases it might be expedient, convenient or more economical to dispense with the valve 35 and the return line l9. If such is the case, the sump 20 can be made removable by providing a hanger pin 42 which engages a part of the sump and a lug 43 and a locking connection 44. This locking connection may comprise a spring arm 45 fastened to a part of the device as indicated at 46, and a lip 41 formed on the sump, the lip 41 being engaged by a-keeper end 48 on the spring arm 45. Therefore, when the sump is filled with fuel a sumcient distance to prevent the reception of oil to the chamber 6, the sump can very conveniently be removed and the contents poured therefrom.

'uRegardless of the sumpconnection and ar rangement, the device is of such a construction that the oil cannot escape from the sump at least until the mechanism has tripped and shut off further flow of oil.

The invention provides new and novel means for positively cutting ofl the fuel supply line when a certain amount of excess fuel has been delivered through faulty operation or otherwise. The parts are simple and compact in construction and arrangement and the device as a whole operates positively and eiflciently. The invention further provides for a return line to the sump or for a removable sump where no return line is required or desired. In cases where the return line is used, and it is deemed advantageous to use it, the sump may be provided with a spring valve operated so that it will always be free. The particular construction of the sump outlet valve is such that the valve cannot be blocked up by placing objects underneath it as it must be pulled outwardly to drain the sump. Also the arrangement of the valve is such that it cannot be left open accidentally. Valve mechanism designated generally by the numeral 49 may be provided for shutting off the communication of fuel from the chamber 6 to the burner feed line l4.

Changes may be made in the form, construction, and arrangement-of the parts without departing from the spirit of the invention or sacrificing any of its advantages, and the right is hereby reserved to make all such changes as fairly fall within the scope of the following claim.

The invention is hereby claimed as follows:

A liquid control mechanism comprising an intake chamber, a control chamber and a sump chamber, said intake chamber and said sump chamber being in parallel juxtaposition and located directly below the control chamber, a vertical passage connecting the top of the intake chamber to the bottom of the control chamber, a

valve seat disposed at the opening in the control chamber of the said vertical passage, a valve closure rod operatively mounted in the valve seat and adapted to move longitudinally in a vertical line into and out of engagement with the valve seat, a collar on said valve closure rod, a yoke pivotally mounted in the control chamber, one end of said yoke engaging the collar, a float member rigidly mounted on the other end of the yoke means, outlet means in the control chamber, auxiliary spring actuated means adapted to operatively engage the valve closure rod and move the same to closed position, means normally holding said auxiliary means out of operative engagement with said valve closure rod, conduit means opening into the top of the sump chamber, said conduit means opening into the control chamber at a predetermined level above the level of the outlet means of the control chamber, sump float means in the sump chamber, and means operatively connecting the sump float means with the said holding means, said connecting means being operable to actuate the auxiliary means into operative engagement with respect to the valve closure rod to move the same to closed position when the sump float means rises in the sump to a predetermined level. v

, OSCAR L. BOOK.

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