US2025696A - Flow controlling unit for gas burners - Google Patents

Description

FLOW CONTROLLING UNIT FOR GAS BURNERS Original Filed June 30, 1934 /O- v m w ii Z? 55 F 5.5

U 3 tr 2; U M U fi /v. 2: 15/ 23226 1 ||f|i i (Ittorneg Patented Dec. 24, 1935 UNITED STATE-S PATENT OFFICE FLOW con'raormno UNIT so GAS amass rlginal application June 30, 1934, Serial No.

733,281. Divided and this application January 9, 1935, Serial No. 1,003

Claims. (Cl. 158.49)

This application is a division of my application, Serial No. 733,281 filed June 30, 1934; and the present invention has for its object to provide new and useful improvements in gas burn- 5 ing apparatus of the type comprising a casing which extends from a house heating furnace wherein the burner heads are positioned, a typical installation of that type being shown in my Patent No. 1,927,019 dated September 19, 1933. More particularly it is an object of the invention to provide new and useful combination of means for efiecting control of the fuel and air supplies to the burner.

Referring to the drawing wherein the preferred form of the invention is shown,--

Fig. 1 is a side view in vertical section of the apparatus comprising the present invention;

Fig. 2 is. an end view of the same with some parts omitted and others in section; and

Fig. 3 is a fragmentary view on a reduced scale, the view being taken on line 33 on Fig. 2.

In the drawing, It indicates a portion of a rectangular casing for housing a plurality of mixing tubes II which deliver to a burner of the same general type as is shown in my said Patent No. 1,927,019. Primary and secondary air for the burner enters the casing through an inlet controlled by a damper l2 mounted to turn on a horizontal pivot l2, the casing having an end wall 66 adjacent to said inlet.

Each mixing tube It is secured, adjacent its inlet end, to the lower wall Ill'of the casing In by a cap screw l3. The inlet end of each mixing tube is of the usual flaring construction for receiving both air and fuel gas, the admission of air to the tube being controlled by a shutter l4 which is hinged as at Hi to the lower rim of the tub-e, a spring l6 being provided at the hinge for normally holding the shutter open. The position of the shutter is controlled by an adjustable screw rod I! supported in a manner hereinafter described.

The top, bottom and side walls of the casing H! are extended a substantial distance beyond its end wall 66; the bottom wall of the extension being indicated at His and serving as a shelf for supporting a. pressure regulator comprising bottom and top covers l8 and I9 secured together at their rims by bolts 24. Forming part of the bottom cover l8, at one end thereof, is a cross bar 2| which is secured to said wall or shelf Illa by cap screws 20. Adjustably positioned in the ends of the cross bar 2| and extending through said wall Illa are upright posts 22 for support- ,ing the outer end of the casing It on a floor 23 or the like.

Clamped between the covers it and I9 is a diaphragm 25 of leather or the like; and supported on the diaphragm is a loading plate 26. A backing plate 21 and a cap screw 28 hold the diaphragm and loading plate together. The cap screw has an axial bore and radial connecting holes 23' in its head; and the loading plate 26 has an axially apertured pillar 23 from which extends an axially apertured valve 30, and from the valve extends a bent tube 31.

Detachably secured to the top I9 of the diaphragm case is a hollow body which is divided by a partition 3| to form two pressure chambers 32 and 33 which are in communication through an upright conduit 34 which forms an opening through the partition. The inlet to the chamber 32 is indicated at 35 in Fig. 2 and a gas supply pipe 36 is shown as delivering to said inlet.

The chamber above thediaphragm 25 is open to the atmosphere or to the interior of the casing ID by a vent 36 from which extends a short pipe 33. To prevent the leakage of gas from the inlet chamber 32 to the chamber above the diaphragm, there is provided a flexible seal 40 which is clamped between the valve 30 and the pillar 29 and the top of the member l9 and the lower end of the chambered body.

Arranged to seat on the upper end of the conduit 34 is a shut-off valve 4|. The stem 42 of this valve extends through a head 43 at the top of the neck 44 of the outlet chamber 33, the head being held to its seat by a clamping nut 44'. Projecting from the head 43 in a chassis 45 which forms a support for a motor mechanism (not shown) but which is housed by the cover 46. Between the head 43 and valve 4| is a coil spring 41 which normally tends to hold the valve to its seat on the conduit 34, it being understood that the motor mechanism inside of the cover 46 will, when energized, open the valve against the tension of said spring.

Arranged to be actuated by the motor mechanism inside of the cover 46 is a. lever 43 which is operatively connected to the damper l2, as by a link 49, a lever 50 and a spring 5|, in a manner to open the damperwhen the valve 4| is opened.

Leading from the side of the conduit 34 is a gas outlet or passage 52 through which gas is free to flow to a pilot when a valve inside of a valve enclosure 53 is open.

Forming part of the chamber 33 is a header 54 which extends above and across the diaphragm cover l9 at one side of the latter, the header having down-turned ends 55. Screwed into and extending from each end 55 of the header is a gas discharge tube 56 which extends through the casing wall 66, the shutter l4 and a centering hub 5'! in the inlet end of the mixing tube, it being noted that the discharge end of the tube is relatively restricted to form a discharge nozzle.

Inside of each tube 56 is a flow controlling valve comprising a tapered head 58 having a restricted axial passage 58' therethrough and radial guiding wings 59 for the head. The stem of the valve comprises two spaced parallelly extending members 60 which join in a hub 6| in which is swivelled one end of a screw 62 which projects through the header 54 and into a fitting 63 screwed into the header wall as clearly shown in Fig. 3. The outer end of this fitting is closed by a cap screw' 64 which is removed when the screw 62 is to be turned to adjust the valve. The restricted passage 58' insures a predetermined minimum flow of gas even though the valve proper maybe closed and insures that such minimum shall be discharged as a jet having an air entraining effect.

Extending through and supported by the end wall 66 of the casing I0 is a screw rod 68 which cooperates with a depending finger 69 on the damper l2 to fix the degree of opening of the latter. The rod for adjusting the degree of opening of the air shutter 4 also extends through said wall 66; but instead of being supported by said wall it is supported by the header 54, as indicated at 65. A removable end cover 61 cooperates with the extension of the casing II] to conceal the mechanism inside of said extension. 7

It will be readily appreciated that such gas pressure as is effective in the conduit 34 will also I be effective on the underside of the diaphragm 25 by reason of the pressure passage beginning with the top of the tube 31 and ending with the radial ports 28' in the cap screw 28; and also that if such pressure exceeds the'weight on the diaphragm, the latter will move the valve 30 upwardly to restrict the efiective inlet area'of the conduit 34 with resultant reduction of pressure in the conduit 34. When the valve 4| is closed it will be readily appreciated that the conduit 34 functions as a pressure chamber insofar as the gas outlet 52 is concerned and, therefore, that gas at regulated pressure will be supplied to the pilot for the burner even though the valve 4| is closed. The upper end .of the tube 31 is bent laterally to compensate for suction efiect produced by the gas in flowing through the conduit 34 when the valve 4| is open.

What I claim as new and desire to secure by Letters Patent is:

1. A front end assembly for burner apparatus comprising a casing having an outer end wall and having an inlet for air in one of its walls, a mixing tube having its fuel and air intakeend inside of said casing, a gas nozzle extending through said end wall and delivering to said end of the mixing tube, a gas supply chamber outside of said casing and from which said gas nozzle extends, a shelf supported by said casing outside thereof at its front end, and a diaphragm chamber supported on said shelf and constituting a support for said gas supply chamber.

2. A-front end assembly for a domestic heating furnace comprising a casing having an outer end wall and having an air inlet in one of its walls, a damper controlling communication from the open air through said inlet to the said casing, means for limiting the range of damper opening including a rod adjustably mounted in the outer end wall of the casing, a mixing tube having an air intake arranged within the casing, a gas nozzle that extends from without through the end wall of the casing to'said mixing tube, a gas conduit leading to said nozzle, a flow controlling valve in said nozzle and having a stem which extends ,across and through the walls of the conduit iting the range of damper movement and comprising an axially movable rod extending trans versely through said end wall, a gas nozzle extending from said header transversely through said end wall, a mixing tube to which said nozzle extends and which has within the casing and air intake, a shutter arranged within the casing and controlling such air intake, and means for adjusting said shutter including an axially movable rod extending transversely through said end wall.

4. A front end assembly for a domestic heating furnace comprising a casing having an outer end wall and having an inlet for air in one of its walls, a damper for controlling the ingress of air through said inlet to the casing, a pressure chamber. outside of the casing adjacent said end wall, a pair of mixing tubes each having an air intake within the casing in spaced relation with respect to said end wall and facing the latter, a gas header forming part of said pressure chamberand extending crosswise of the casing adjacent the outer side of said end wall, a pair of gas nozzles extending from said header through said end wall of the air intakes of the respective mixing tubes, means adjustably supported by said header for varying the effective outlet area of the respective gas nozzles, means comprising a shutter within the casing and an axially movable rod extending throughsaid end wall for controlling the admission of air to said mixing tube, and

means comprising an axially movable rod extend". r.

ing through said end wall for controlling the degreeof opening of said damper.

5. A front end assembly for a domestic heating furnace comprising a casing having an outer end wall and having an inlet for air in one of its walls, a gas supply header arranged outside of the casing adjacent to said end wall, a gas nozzle extending from said header transversely through said end wall, a mixing tube to which said nozzle extends and which has within the casing an air intake, a tiltable shutter arranged within the casing and controlling such airintake, means for tilting said shutter comprising an axially movable rod extending transversely through said end wall, and means including a damper for controlling the entry of air through said inlet to said casing.

NELSON T. BRANCHE.

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