US1314174A

US1314174A - stewart

Info

Publication number: US1314174A
Authority: US
Publication date: 1919-08-26
Anticipated expiration: 1936-08-26

Description

s. 8. WEEKS AND 0. n. SIEWABT. FURNACE DRAFT REGULATOR- APPLICATIUN FILED DEC-18. 1916' 1,3 14, 1 74. Patented Aug. 26, 1919.

2 SHEETS-SHEET I.

INVENTOR SHfRLEY 5. WEEKS CARLTON D. STEWART S. 3. WEEKS AND C. D. STEWART.

FURNACE DRAFT REGULATOR.

APPLICATION FILED 02c. 18. ms.

Pamnted Aug. 26, 1919.

2 SHEETS-SREET 2- SHIRLE Y 8. WE EKS CARLTON D. ST E WART UNITED STATES PATENT OFFICE.

SHIRLEY S. WEEKS, F OAKLAND, AND CARLTON D. STEWART, OF BERKELEY,

CALIFORNIA, ASSIGNORS TO ASSOCIATED ENGINEERING AND SUPPLY COM- PANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

FURNACE DRAFT-REGULATOR.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Be it known that we, SHIRLEY S. WnnKs and CARLTON D. STEWART, citizens of the United States, residing at, respectively, To all whom it may concern: Oakland and Berkeley, in the county of Alameda and State of California, have jointly invented a certain new and useful Improvement in Furnace Draft-Regulators, of which the following is a specification.

This invention relates to fuel oil and gas burning apparatus, and more particularly to automatic controlling mechanism therefor.

The principal object of our invention is to provide means for insuring that the dampers will be open when fuel is admitted to the furnace and closed when fuel is out off from the furnace so that the dampers will always be in the proper position to safely and economicall control the fires.

Other objects and a vanta s will appear in the following more detaied description of the invention.

In the accompanying drawings; Figure 1 is a front elevation, partly broken away, of one of a batter of steam boilers, with our improved liqui fuel and furnace draft regulating apparatus applied thereto; Fig. 2 a side elevation of the furnace draft regulating mechanism shown in Fig. 1, with certain parts omitted; Fig. 3 a detail View of the stroke adjusting device for the furnace draft regulator; Fi 4a central sectional view of the control ing valve and p-islzon-mechat nism of the draft regulator; Fig. 5 a central sectional view of the one unit of the master controller; Fi 6 a transverse sectionv on the line 'a-c of i 5; Fig. 7 a central sectional view of t e fuel regulator; and Fig. 8 a section on the line Zi-b of Fig. 7.,

In Fi 1 of the drawings, there is shown a steam iler 1, partly broken away, having a steam dome 2, a stack damper 8, ash pit or draft doors 4 and provided with oil or gas burners 5 of any desired construction.

The regulating apparatus inaycomprise a master controller having two or more controller units 6, 6', each connected to a. steam supply pipe 7, fuel and atomizing regulators 8, a fuel pump 9, and a furnace draft regulator having two or more regulating

units

10, 10.

Each master controller unit 6 may comprise a casing having a chamber containing a piston having differential piston heads 11 and 12. Piston chamber 13 containing the small piston head 11 is connected to pipe 14 into which the pump 9 supplies liquid fuel under pressure and piston head 12 is contained in piston chamber 15 the pressure in which is controlled by a valve 16.

The annular chamber 17 intermediate piston heads 11 and 12 is connected at one side to pipe 18, through which fuel udder pressure is supplied to the fuel regulators 8 and the draft regulators 10, and said chamber is also connected to an overflow or return pipe 19.

The valve 16 is controlled 'by a diaphragm 20 connected thereto by rod 21 and subject on one side to the pressureof an adjustable spring 22 and on the opposite side to steam pressure supplied from the boiler through pipe 7. v

be fuel and atomizing agent regulator 8 may comprise a casing having piston chamhere 23 and 24 containing

pistons

25 and 26 subject respectively to the pressure of

springs

27 and 28 and connected to pipes 29 ?.{)Id 30 leading to the draft regulators Steam for atomizing the liquid fuel is supplied through pipe, 31, and admission through pipe 32 to' the burners 5 is controlled by valves 33 and 34:. Fuel is supplied to the regulator through pipe 35 and communication frompipe 35 to pipe 36 leading to the burners 5-is controlled by valves 37 and 38, liquid fuel being supplied to pi e 35 by the pump 9 through a. reducing va vs 39. i p

. Each of the draft regulating units 10 may comprise a casing having a piston chamber 40 containing a piston 41 carrying a piston rod 42 and a valve chamber containing a piston valve 43 having a stem 44 adapted to engage the piston 41. i

The piston chamber at one side of the piston 41 is. connected to the return pipe 19 and the piston chamber at the opposite side is connected to ipe 18.

The piston ro s 42 are connected to other by a chain 45 which passes over a pul ey 46 and the pulley is secured to one end of a rod 47, the opposite end of which is connected to a lever 48, as more clearly shown in Fig. 2 of the drawings. The lever 48 is secured to a shaft 49 carrying at its opposite end a lever 50 which is connected by a rod 51 with a lever 52 adapted to operate the stack damper, 3 the stack damper being provided with a weighted arm 53 tending to turn the damper to its open position.

The pulley 46 also carries a downwardly proj-ecti rod 54 which is connected to the end of a ever 55, secured to a shaft 56. To the shaft 56 is also secured a lever 57 connectedby a rod 58 with a, lever 59 for operating the 'ashpit door 4 and a weighted lever 60 is carried by shaft 56 and tends to throw the door 4 open.

In order to limit, and provide for the adjustment of, the stroke of the pistons 41 to correspond with the movement necessary to operate the dampers, adjustable stops 61 adapted to be clamped to the chain 45 are rovided, as shown in detail in Fig. 3 of Fire drawings. The stops 61 upon engagement with the upper ends of casing 62 prevent further movement of the pistons 41, as will be evident.

In operation, fuel under pressure is supplied by pump 9 through pipe 35, at a reduoed pressure corresponding with the adjustment of reducing valve 39, to the regulators 8, so that the upper faces of

pistons

25 and 26 are sub'ected to fuel'under pressure.

Fuel under the full pressure of the ump also passes through pipe 14 to piston c amber 13 of each master controller unit 6 and to the ressure chamber 63 of the damper

control ing device

10, 10.

Steam pressure from the boiler is admit ted through pipe 7 to the up or sides of diaphragnis 20 and is supplied t rough pipe 31 to theregulators 8.

Assuming the iires in the furnaces to be burning, the dampers, open, and the springs 22 adjusted to the desired stearn pressure, for example, the spring of the unit 6' may be adjusted to the maximum steam pressure desired whiie the spring 22 of the unit 6 may be adjusted to within two pounds or less of the maximum boiler pressure.

The valve 16 being closed, fuel under pressure flows from piston chamber 13 through a restricted passage 64 to piston chamber 15 and since the piston head 12 has a greater area than'piston head 11, the differential piston device will be shifted to its lower posltion, in which the pipe 18 is connected by the annular chamber 17 with return pipe 19.

When the steam pressure rises to a degree slightly exceeding the pressure of s ring 22 in a master controllerunit 6, the

iaphragm 20 will move downwardly and through stem 21 will cause valve 16 to be opened. 7

The fuel under pressure in chamber 15 is then vented through passage 65 to return pipe 19 at a greater rate than it can flow through restricted passage 64 and consequently the higher pressure acting on piston head 11 operates to shift the diiferential piston device to its upper position, in which the piston head 11 closes communication from pipe 18 to the return pipe 19 and opens communication from supply pipe 14 to pipe 18.

Fuel under pressure is therefore supplied through pipe 18 to the u per face of piston 41 of the damper regu ator unit 10 and thence through passage 66 to pipe 30 which leads to the piston c amber 24 of the fuel regulator 8. Since the fuel acting, above the piston 26 is at a reduced pressure, the full pump pressure of fuel now admitted below the iston 26 operates to shift same to close the uel and atomizin

agent supply valves

38 and 34, so that on y the valves 37 and 33 remain open and consequently the fuel flow is reduced and the intensity of the fire in the furnace is diminished.

The piston chamber 40 being open to the return pipe 19, the fuel pressure acting on the upper face of piston 41 of unit 10 causes the piston to move downwardly so as to cause a downward movement of the pulley 4'6 and rod 47. The stack damper is thus turned to partially close the sam'e as shown in Fig. 2 of the drawings and similarly the downward movement of the rod 54 operates to partially close the ash pit door 4, the movement being limited by the engagement of stop 61 With casing 62.

' When the piston 41 is in its uppermost position, a port 67 permits flow of fuel under ressure from pipe 18 and around the loosely tted stem 42 to the chamber above the piston valve 43, so that the fluid pressures on opposite sides of the piston valve being baianced,'the spring'68 will force the same downwardly as the piston 41 moves down.

As thepiston valve 43 moves downwardly, it closes communication from pipe 1 8 to pipe 30, but by "the same movement, communication is o ened from the chamber 68, containing fue under full pum pressure through the annular chamber of the piston valve to pipe 30, so that the maximum pump ressure is maintained on the piston 26 of tllie'r'ggulator 8 to hold the fuel supply va lves c ose the furnace fires partially reduced and the dampers artly closed by the above operation s oui there be a further increase in boiler steam pressure suiiicient to overcome the pressure of the sprin 22 of the master controllerunit 6, then t e diaphragm 20 of this unit will operate to open the valve 16 so as to vent fuel under pressure from piston chamber 15 thereby permitting the fuel pressure acting in piston chamber 13 on the piston head 11 to effect the movement of the differential piston 12, so that fuel under pressure is admitted from fuel supply pipe 14 through pipe 18 to piston 41 of the damper regulating unit 10'. Fuel under pressure is thereupon supplied first from pipe 18 and then from chamber 63 to pipe 29 and thence to piston 25 of the fuel regulator 8, operating the iston to close the valves 37 and 33, thus cutting off the flow of fuel and atomizing agent to the burners, so that the intensity of the furnace fires is further reduced.

. The piston 41 of the damper regulating unit 10 is then actuated by the fuel under pressure so as to effect the downward movement of the stem 42. The pulley 46 is thereupon shifted downwardly and causes the further closing of the stack damper 3 and the ash pit door 4.

As in the operation of the damper controlling unit 10, the piston valve 43 of unit 10 is shifted upon the downward movement of piston 41 so as to connect chamber 63 with pipe 29 and thus maintain full pressure on the piston 25 of the fuel regulator 8.

While the maximum boiler pressure is maintained, the fire in the furnace remains reduced and the dampers and ash pit doors remain closed the desired amount. If the boiler pressure should reduce below the maximum pressure, the dia hragm 20 of the master controller unit 6 W111 be moved upwardly by its spring 22 closing the valve 16. This permits t e equalization of fuel pressures on the opposite piston heads of the differential piston device, so that the pressure acting on the larger area of piston 12 causes the downward movement of the piston device, thus closing communication from pipe 18' to supply pipe 14 and opening communication from the pipe 18' to the return pipe 19.

Fuelunder pressure is then vented from piston 41 of the damper regulating unit 10 and the

counterweights

53 and 60 cause the stack damper 3 and the ash pit door 4 to open, the piston 41 moving upwardly.

While the piston 41 is moving upwardly to open the dampers, the piston valve 43 remains in its lower position until the piston 41 has nearly completed its upward stroke, when the same engages the piston valve and shifts same upwardly. The upward movement of the piston valve 43 then connects pipe 29 with pipe 18', so that the fuel under pressure in piston chamber 23 is vented, permitting the fuel pressure above the piston 25 to shift same and open the fuel valve 37 and the atomizing agent valve 33 and thus increasing the fuel supply to the burners.

In a similar manner, if the boiler pressure should still further reduce, the diaphragm 20 of the master controller unit 6 will be moved upwardly by its spring 22, closing the corresponding valve 16 and thereby effecting the furt er opening of the stack damper and the ash pit door. When the piston 41 of the unit 10 engages the piston valve 43 in its upward movement, the fuel ressure is vented from piston 26 of the uel regulator through pipe 30, so that the

valves

38 and 34 are opened to still further increase the fuel supply to the burners.

It will now be evident that in the operation of our construction the opening of the dam ers is positively assured when fuel is admitted to the burners, and the dampers are closed the desired amount when the fuel supply is reduced.

Any desired number of fuel regulators 8 and damper controllers 10, 10' may be governed by the master controller, and if desired, additional master controller units may be employed in order to provide an increased number of steps in the regulation.

Having now described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. In a liquid fuel burning apparatus, the combination with a furnace and a mechanism for regulating the flow of fuel to the furnace, of a device for regulating the furnace draft and means operated by Said device after the furnace draft has been opened for effecting the operation of said mechanism to increase the supply of fuel to the furnace.

2. In a liquid fuel burning apparatus, the combination with a furnace and a mechanism for regulating the flow of fuel to the furnace, of a device for regulating the furnace draft and means operated by said device before the furnace draft has been closed for effecting the operation of said mechanism to reduce the supply of fuel to the furnace.

3. In a liquid fuel burning apparatus, the combination with a furnace and a mechanism for regulating the flow of fuel to the furnace, of a device for regulating the furnace draft and means operated by said device for effecting the operation of said mechanism to vary the supply of fuel to the furnace.

4. In a liquid fuel burning apparatus, the combination with a fuel burner and a fuel regulator operated by fuel under pressure for controlling the suppl of fuel to the burner, of a damper regu ator operated by fuel under ressure for controlling the flow of fuel un or pressure for operating said fuel regulator.

5. In a liquid fuel burning apparatus, the combination with a fuel burner, a fuel regulator operated by fuel under pressure for controlling the supply of fuel to the burner, and a master controller for controlling the supply of fuel under pressure for operating said fuel regulator, of a damper regulator for operating the damper and adapted to control the flow of fuel under pressure from the master controller to the fuel regulator.

6. In a liquid fuel burning apparatus, the combination with a fuel burner, a fuel regulator operated by fuel under pressure for controlling the supply of fuel to the burner, and a master controller for controlling the supply of fuel under pressure for operating said fuel regulator, of a damper regulator having a piston operated by fuel under pressure for shifting the damper and valve means for controlling the flow of fuel under pressure from the master controller to said fuel regulator.

7. In a liquid fuel burning apparatus, the combination with a fuel burner, a fuel regulator operated by fuel under pressure for controlling the Supply of fuel to the burner, and a master controller for controlling the supply of fuel under pressure for operating said fuel regulator, of a damper regulator operated by the flow of fuel under pressure from the master controller to the fuel regulator for operating the damper.

8. In a liquid fuel burning apparatus, the combination with a fuel burner, a fuel regulator operated by fuel under pressure for controlling the supply of fuel to the burner, and a master controller for controlling the supply of fuel under pressure for operating said fuel regulator, of a damper regulator having a iston adapted to be actuated by the flow 0 fuel under pressure from the master controller to the fuel regulator for controlling the movement of the damper.

9. In a liquid fuel burning apparatus, the combination with a fuel burner, a fuel regulator operated by fuel under pressure for controlling the supply of fuel to the burner, and a master controller operated by boiler steam pressure for controlling the supply of fuel under pressure for operating sai fuel regulator, of a damper regulator having means for first supplying fuel under pressure from the master controller to the fuel regulator and a piston operated by the flow of fuel under pressure to the fuel regulator for then operating the damper.

10. In a liquid fuel burning apparatus, the combination with a fuel burner, a fuel regulator operated by venting fuel under pressure therefrom for opening the sup ly. of fuel to the burner, and a master controller operated by a reduction in boiler steam pressure for venting fuel under pressure from said fuel negulator, of a damper regulator having a piston operated by venting fuel under pressure therefrom for opening the damper and valve means operated by said piston for opening communication for venting fuel under pressure from the fuel regulator to the master controller.

11. In a liquid fuel burning apparatus, the combination with a fuel burner, a multiple stage fuel regulator operated by liquid under pressure for regulatin the fuel supply to the burner by steps, an a multiple stage master controller operated by variations in boiler steam pressure for; varying the liquid pressure on said fuel regulator, of a multiple stage damper controller operated by liquid un er pressure for adjusting the damper by steps.

12. In a liquid fuel burning apparatus, the combination with a fuel burner, a plurality of fuel regulator units, each controlled by fuel under pressure for varying the supply of fuel to the burner, and a plurality of master controller units, each governed by boiler steam pressure for controlling the supply of fuel under pressure to the corresponding fuel regulator unit, of a plurality of damper regulator units, each controlled by the How of fuel under pressure from one master controller unit to the corresponding fuel regulator unit for varying the position of the damper.

In testimony whereof we have hereunto set our hands' SHIRLEY S. WEEKS.

CARLTON D. STEWART.

Outlet of this patent my be obtained 10] an cents each, by addressing the "Commissioner of Patents,

Washington, D. B."