US2771943A - Oil burner - Google Patents

Description

Nov. 27, 1956 H. J. WISER, SR

011. BURNER 2 Sheets-Sheet 1 Filed Feb. 20, 1952 INVENTOR.

HUBER? J W/see SA.

ATTORNEV Nov. 27, 1956 H. J. WISER, SR

OIL BURNER 2 Sheets-Sheet 2 Filed Feb. 20, 1952 INVENTOR HUBEAT J M55: 5&-

Mb On 3 M u mHH 1, 0o zvm HTTOIPIV V United States Patent O OIL BURNER Hubert I. Wiser, Sr., Bloomington, 111., assiguor, by mesne assignments, to Henney Motor Company, Inc., New York, N. Y., a corporation of New York Application February 20, 1952, Serial No. 272,540

4 Claims. or. 158-363) This invention relates to oil burners and has particular reference to oil burners of the low pressure type in which oil and air are supplied under relatively low pressures to an oil and air mixing nozzle, which nozzle mixes the oil and air therein and discharges a mixture of finely divided particles of oil and air into a stream of secondary air which flows past the nozzle.

A principal object of the invention is to provide a new and improved oil supplying means for an oil burner.

A further object of the invention is to provide a new and improved oil and air pumping unit for an oil burner.

Other and further objects of the invention will be apparent from the following description and claims and may be understood by reference to the accompanying drawings, of which there are two sheets, which by way of illustration show the preferred embodiment of the invention and what I now consider to be the best mode in which I have contemplated applying the principles of my invention. Other embodiments of the invention may be used without departing from the scope of the present invention as set forth in the appended claims.

In the drawings:

Fig. 1 is a schematic view of the air and oil pumping unit of an oil burner embodying this invention.

Fig. 2 is a continuation of Fig. 1 and schematically illustrates certain other portions of the oil burner disclosed in Fig. 1.

The oil and air pumping unit disclosed in Figs, 1 and 2 comprises in general an air supply pump 10, an oil supply pump 12, an oil metering pump 14, and an oil and air mixing nozzle indicated generally at 16 adapted to be supplied with oil and air under relatively low pressures from the oil and air pumps 14 and and to discharge such oil and air in the form of a spray of finely divided oil particles and air into a stream of secondary air supplied through an air tube 17 past nozzle 16 by a blower or fan 18 so as to form a combustible mixture of oil and air. The air and oil pumping means are mounted on and arranged to be driven by a shaft 20 which may be suitably coupled to the shaft of an electric motor (not shown) and blower 18 may also be driven by such electric motor.

The air pump 10 is of the rotary sliding vane type and includes a rotor 22 secured to shaft 20 so as to rotate therewith within an eccentric cylinder 24. The rotor 22 is provided with a series of radial slots in each of which is arranged a sliding vane so that upon rotation of rotor 22 air will be drawn in through the air inlet 26 and discharged from outlet 28. The casing or housing 30, which houses the air and oil pumping unit, is provided with air inlet openings 32 communicating with an air intake chamber 34 which communicates with inlet 26 to air pump 10 through a filter indicated generally at 35.

Oil from a suitable supply tank is supplied to a filter chamber 36 through port 38 and through a filter 40 to a pipe 42 which communicates with a conduit 44 leading to the inlet 46 of oil supply pump 12. The pump 12 is of the gear type and includes a pair of intermeshing gears, one of which is mounted on shaft 20 to rotate therewith 2,771,943 Patented Nov. 27, 1856 "ice by means of a ball 48 arranged in an axial slot in the gear and in a depression in shaft 20. The pump 12 is provided with an outlet 50 adapted to supply oil through conduit 52 into a chamber 54 in valve body 66 on one side of a flexible diaphragm '56 connected to a normally closed valve means 58, the valve means 58 being movable "with diaphragm 56 under the influence of spring 60 and in response to difierences in pressure on opposite sides of such diaphragm.

The normally closed valve member 5'8 is slidably arranged within a sleeve 62 secured within a passage or valve chamber 64 provided in valve body 66. The valve 53 includes an opening 68 therethrough adapted to communicate with chamber 54 when the valve is in the open position disclosed in Fig. 2. A central passage 70 in valve 58 provides a communication between chamber 54 and a chamber 72 on the opposite side of diaphragm 56. A'passage 7-4 communicates with chamber 72 in valve body 66 and also communicates with an annular chamber 76 formed in a central block 78 of the pumping unit.

Chamber 76 communicates through passages 80 and 82 with metering pump chamber 84 in which the metering pump 14 is arranged.

Metering pump 14 includes a metering pump rotor 86 driven 'by shaft '20 by means of a pin 88 secured within a radial opening in rotor 86 and having its inner end arranged between the bifurcated ends of shaft 20, the end of shaft 2%) extending through an axial opening provided in rotor 86. Rotor 86 is provided with a pair of metering pump cylinders 90 and 92 separated by a fixed plug 94. A piston t 96 is reciprocally arranged in each of the cylinders 99 and 92 and each of the pistons 96 is provided with a cross arm 98 between which cross arms 98 suitable spring means (not shown) may be provided for biasing the pistons 96 away from each other and against the inner wall of a sleeve 100 which is eccentrically arranged relative to rotor 86 so that upon rotation of the rotor 86 the pistons 96 will reciprocate within their respective cylinders so asto effect the intake and discharge strokes ofmetering pump 14. A ball 102 is arranged in a depression in the bifurcated end of shaft 20 and is seated within a central recess in rotor '86 for providing a thrust bearing member between shaft 20 and rotor 86 and for centering the rotor relative to the shaft.

The end face 105 of rotor 86 is lapped and seats and rotates against a similarly lapped face provided on the end block 107. As shown in Fig. 1 the lower piston 96 at the end of 180 rotation have completed its discharge stroke, while the other piston would have completed its intake stroke. The eccentricity of sleeve 100 relative to rotor 84 may be adjusted by means which comprises a threaded plug 109 having a cam surface 111 adapted to I engage a ball 113 which engages the outer surface of sleeve 100 so that the eccentricity of sleeve 100 will be adjusted by adjustment of threaded plug 109.

Oil is supplied from metering pump chamber 84 to intake port 104 through passage 106 and is discharged from the metering pump through outlet 108 and conducted by means of passage 110 to the passage or valve chamber 64 in valve body 66. The valve means 58 is provided with a valve member 112 which is slidably arranged within a bore 114 which communicates with valve chamber 64. Valve member 112 has a central passage 116 opening at one end thereof and adapted to communicate with valve chamber 64 through an opening 118 when the valve means 58 is in its open position as shown in Fig. 2. Valve member 112 is secured to and moves with valve member 58. The outer end of passage 114 in valve body 66 communicates by means of conduit 120 with a pipe 122 for supplying C r I 7 x3 oil to nozzle 16. When the valve 58 is open, with the 7 opening 118 in valve member 112 exposed withincha'mber' 64, metered quantities of oil are supplied to nozzle 16 from the metering pump 14 through passage 110, chamber 64,

passages 118 and-116, conduit 120, and the pipe 122.

The primary air discharged through outlet 28 of air J pump 10 is delivered through passage 124 to conduit 126 g which communicates with the interiorof apipe 128which indicated generally at 130 are provided for igniting the combustible mixture'of oil andair discharged from the nozzle; 7 V

' A by-pass is provided between the inlet and the outlet of the 'oil supply pump 12 and such by-pass includes a normally closed valve means provided by the valve member 58, and an annular restricted passage 140 which is. defined between the shaft 21 and the central bore in the rotor 86, thereby creating a pressure diiferential between the inlet and outlet of the pump. The end of shaft 20, which extends through the gear pump 12 and the rotor86,

,is hollow, and a transversepassage 142 provides a communication between the interior of shaft and seal cham-' her 144. The by-pass between theinlet and outlet of pump 12 includes passage 52, chamber 54, passages 68 and 70 in valve member 58, chamber 72, passage 74, annular chamber 76, passages 80 and 82, the restricted passage V140, the interior of the hollow'end of shaft 20, transverse 7 passage 142 in shaft 20, seal chamber 144, and passage 146 which may communicate with either the filter chamber 36, as shown, or with the fuel supply tank in the event that plug 143 is removed and the threaded opening at the 7 upper end of passage 146 is'closed.

All of the oil'discharged by'the supply pump 12 flows throughpa'ssage52and into chamber 54 where it exerts a fluid pressure against diaphragm 56 tending to move valve member 58 against the force of spring 60 into the *-open' position thereof shown in Fig. 2. The normally closed valve means 58 may be set to open when a predetermined pressure exists in the by-pass', which might be inthe neighborhood of; sevenor'eight'pounds per'square inch, although the pressure at which such valve will open may be set at any suitable value. Valve 58 'regulates the pressure at which oil must be supplied by pump 12 before valve 112 will open and permit theflow'of oil to nozzle 16. Valve 58 will close when the pressure in the bypass falls below the predetermined value, and valve 112 will therefore close at such time thereby shutting off the flow of onto the nozzle.

It will be seen that the inlet tometering pump 14 is arranged between the normally closed valve means 58 and the restricted passage 140, and that oil will be supplied to themetering pump inlet only when the valve means i 58 is open. Since valve member 112 will always be in its open position with passage .118 exposed within valve chamberf64 when valve member '58 is open, metered quantities of oil willbe supplied'thr'ough the normally closed vaive112 to nozzle '16 at such time. The restricted passage 140 permits the flow of,oil from passage 82'into the hollow end of shaft 20 and through passage 142 into chamber 144, and through passage 14610 ,thesupply tank I in ion dischargad by Said pump and opened at at orio the filter chamber, The size of the restricted passage 143 is such "as to create a resistance to the flow of oil 7 therethrou'gh in an amount sufiicient to maintain the pie-- determined pressure in the by-pass during normal operation'of the pump 12 so that valve 58,'and valve 112, will remain open. The passage v140 permits quantities of oil in excess of that required or handled by the metering pnrnpto flow. through the by-pa'ss and back to the supply tank.

The shaft 20 is adapted to rotate in bearings 160 and "162 ,and a running seal indicated generally at 164 is mounted on the shaft for preventing the flow of oil from the seal chamber 144, to the-left along the shaft from such chamber. a

The valve member '112 is arranged within passage 114 7 with a fit sufiiciently loose so that minute. quantities of" oil may flow along the outer surface of valve member 112 and'into passage 170which communicates with'the inlet 26 to air pump 10 so that small quantities ot; oil wilhhe drawn into the pump 10 .for lubricating the same mater improving the efliciencythereofxqSuch small quantities of oilsas are drawn into pump 10. will'be discharged therefrom,'together with air, through passage 124'to nozzle 16. '15

A pressure regulating valve 172 vgo'mnm'nicates with passage 124 and with passage 170 and regulates the pressure 8 at which 'air is supplied by air pump 10. r

avail myself of such changes and alterations as fallwithin the purview of the following claims.

'I claim:

1. An oil burner comprising an oil pump having an' inlet and an outlet, a by-pass between said inlet and outlet, normally closed valve means and-a restricted passage in said by-pass in the order named and operative to resist flow-of oil therethrough during "operation of said pump thereby to create a pressure diiferential between said inlet and outlet, a fuel metering device having its inlet connected to said by-pass between said valve means and said restricted passage so as to be supplied with oil froms'aid.

' pump when said valve means is open, a nozzle connected to said; metering device so as to be supplied with oil therefrom, and a normally closed valve in the connection between 'said nozzle and said meteringdevice, said valve Y being connectedto said valve means and movable there with so as to be opened by opening movement .of said valve means.

2.'An oil burner comprising an 011 pump having an inlet and an outlet, a bypass betweens'aidinletiand outlet, 7 V nonnally'closed valve means anda'restrictedpassage in said by-pass in the order named and operative to resist flow of oil therethrough during operation of said pump thereby to create a pressure differentialbetween said inlet and outlet, an on atomizing nozzle connected to said, by-pass between said valve means and said restricted'pas sagesonas to be supplied with oil from said pump :when;

said valve means is open, a normally closedvalve inthe connection-between said nozzle and said by-pass and connected to said valve means so as to' be openedgby opening movement of said valve means, said valve means being opened in response to a predetermined pressure in. satd y-p s -fi t s r 3- .An oil urner comp si g an o l p mp h ing an inlet and an outlet,'a by-pa ss between saidinlet and outlet,

normally closed valve means ,in said by-pass, a nozzle '1 connected to said by-pass downstream from said valve means so i as to be supplied with oil from said pump when said valve means is open, a normally closed valve in the connection between said nozzle 'and said byepfis's, said valve means and valve being responsive to the p e sure an oil :atomizing nozzleconnected to said by-pass between valve means andsaid restricted passage so as :to be supplied with oil from said pump when said valve means is open, a normally closed valve connected to said valve means and in the connection between said nozzle and said by-pass, and actuating means connected to said pump outlet and to said valve means for opening said valve means and said valve in response to a predetermined pressure in the oil discharged by said pump.

References Cited in the file of this patent UNITED STATES PATENTS 2,484,920 Witherell Oct. 18, 1949 2,494,714 Lyman Ian. 17, 1950 2,606,603 Witherell et a1 Aug. 12, 1952

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