US1042403A - Gas and air mixing meter. - Google Patents

Description

G. R. GOTTRELL. GAS AND Am MIXING METER.

APPLIOATIOH FILED DEC. 6, 1911. LQQQAG3Q Patented Oct. 29, 1912.

2 SHEETS-SHEET 1 INVENTOR now? G. R. GOTTRELL. GAS AND AIR MIXING METER.

APPLICATION FILED DEC. 6, 1911.

Patented Oct. 29, 1912.

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COITRELL, OF ANGLESEA, NEW JERSEY.

GAS AND AIR MIXING METER.

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Specification of Letters Patent.

PatentedOct. 29,1912

Application filed December 6, 1911. Serial No. 684,164.

To (4M whom it may concern:

Be it known that I, GEORGE E. CoTTnnLL, a citizen of the United States, residing at Anglesea, in the county of Cape May and State of New Jersey, have invented certain new and useful Improvements in Gas and Air Mixing Meters, of which the following is a specification.

This invention relates to gas and airniixing meters, in which an air-measuring drum is driven or revolved by the pressure of gas passing through, and revolving, a gas-measuring drum, for mixing gas and air in definite and constant proportions, at a uniform velocity and pressure, whereby perfect combustion of the mixture may be produced at the burners.

The object of my invention is to provide a mixing meter in which the screw-measuring compartment of the gas and air drums have diverging walls and are of an increasing cross from. the contracted inlet opening toward the middle portions, and converging walls beyond the middle portions to contracted outlet openings, whereby the currents of intlowing in the gas drum will impinge with the greatest pressure and efficiency upon of any two compartments open above the Water line, for causing tne'drum to revolve and thereby cause the air drum to revolve for measuring and mixing gas and air in velocity and pressure.

The relative capacities of the measuring compartments of the air and the gas drum in the example illustrated are such that the air drum will take in and discharge approximately five volumes of air while the gas drum takes in and discharges one volume of gas, thereby forming a mixture containing six volumes of combustible fluid. The gas and air, in their respective volumes, are discharged simultaneously at the same velocity into a mixing chamber between the adjacent ends of the drums, so that an intimate mixture is produced, and this mixture is discharged into the outlet pipe under approximately the same pressure as the initial pressure of gas at the intake of the gas drum. The pressure is constantly maintained during the revolution of the drums and while the mixture is flowing to the burners.

The matter constituting my invention herein will be defined in the claims.

I will now describe th 1 the diverging walls of con struction of my improved gas and air mixing apparatus by reference to the accompanying drawings, in which- Figure 1 represents a vertical longitudinal section through the casing, the drums and the vanes of the gas drum. Fig. 2 represents a vertical transverse section on lines 2-2, Fig. 1, with a part in elevation. Fig. 3 represents a partial end elevation of the outer casing. Fig. i represents a diagrammatic view of the air drum showing the screw vanes as though laid out in plan and presenting an edge view, for showing the planes. Fig. 5 represents a similar view of the gas drum with its vanes.and planes forming the screw measuring compartments.

The outer cylinder casing is preferably composed of two semi-cylindrical parts A, A, having flanges a, by means of which they are bolted together, as indicated in Fig. 3.

The parts 1 A may be made of castmetal and will be provided at the ends with angular notches and flanges a for receiving a square boss (2, which carries the gas inlet elbow pipe F. Both ends of the casing may have this construction. By means of the notches and square boss the partsA, A ma be accurately centered and then the bolt holes drilled in the flanges of both parts. The casing is supported on legs a. The gas measuring drum B and air measuring drum C are secured to a center shaft 1), the end of which at the gas inlet end is provided with a pivot point d, while the opposite end is provided with a socket, into which extends the pointed end of a set screw '0 in the elbow pipe H. The pivot d enters a socket in the elbow pipe F. The drums are thus pivotally supported, to turn with the least possible friction. Both of the drums have outer end heads forming respectively the gas chamber 72 and the air chamber 0. The drums are spaced apart at their adjacent inner ends to form a gas and air mixing chamber 9, into which streams of gas and air are discharged from the five measuring compartments of each drum. he head of the gas drum Bhas an inwardly turned tubular extension or collar of larger diameter than the elbow pipe F, so as to leave an annular water seal space 70 around said pipe. This tubular projection c' and seal 71: preventgas, which might pass along the head, from escaping into the outer cas-- A similar tubular extension Z may be EH1 W 100; g SECC-SSlVB .E

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The operation of the gas and air mixing meter is practically automatic, it being only necessary, after connection to the gas service pipe has been made, to open the valve to the burner, when the gas will flow into the chamber 5 and thencethrough openings 0 into any two measuring inlet opening 0 and a narrower discharge opening p into the mixing chamber 9. Owing to the tact that the measuring compartments in the gas drum and in the air drum are of substantially the same shape andof uniform proportions, one to the other, they will deliver currents of gas and air at the same velocity and pressure, so that they will form an intimate'xand homogeneous mixture in the exact pro ortionsin chamber g, to cause complete andpertectcombustion at the burners. Since all the carbonaceous matter and hydrogen in the gas is consumed reason of there being present and mixed "h the necessaryproportion of oxyhigh flame temperature is produced at economy is tt'ectecl in the use of fuel.

- abovodescribed construction and as shown in the idrawing it will be understood that the screw;mea; suring compartments of the gas andair drums have contracted inlet 11* d outlet openings,

compartments 4.0 which are open above the water line, The currents of gas now impinge on the driving planes a or diverging walls of the compartment, thereby. causing the drum to revolve and discharge gas into the mixing chamber The air drum will be simultaneously revolved, causing air to be measured and discharged into mixing chamber g. The successive currents of gas and air at the same velocity are uniformly mixed in chamber 9 and passed therefrom to the burners.

The mixing meter, as above described and substantially as shown in the drawings, has been constructed and put into practical operation with entirely satisfactory results.

Having thus fully described my invention, what I claim as new,

with diverging walls and of an increaslng cross area from the inlet openings toward the middle portions, and converging walls beyond the middle portions to the contracted outlet openings, whereby the currents of inflowing gas in the drum will impinge with the greatest pressure and etliciency upon the diverging walls of any two compartments open above the water line for causing the drum to re-- volve.

By constructing the helical vanes of the gas drum of such length that each will encircle approximately four-fifths of the circumference of the drum, every measuring compartment, which at one time is open to the gas chamber at the receiving end, will at the same time and desire to secure by Letters Patent, is:

1. In a gas and air-mixing meter, the gas drum mounted on an axle and divided by helical vanes into screw measuring compartments having contracted inlet and outlet openings, and diverging walls, and an increasing cross area from the inlet openings toward the middle portion, and converging walls beyond the middle tothe contracted outlet opening, whereby the currents of inflowing gas, under pressure, will impinge with the greatest pressure upon the diverging walls of any two compartments open above the water line and cause the drum to revolve, substantially as described.

2. In a gas and air-mixing meter, the gas drum mounted on an axle and divided by helical vanes into screw-measuring compartments having contracted inlet and outlet openings, the vanes diverging and the compartments increasingin cross area from the inlet openings toward the middle portion, and said vanes converging beyond the middlc to the contracted outlet openings, the vanes also having sector-shaped planes of different pitch to the axle, and one or more planes of the steepest pitch being in the diverging portions of the vanes between the inlet and middle portions of each compartment, whereby the currents of inflowing gas will impigne'with the greatest pressure upon said planes of steepest pitch in any two compartments open above the water line and cause the drum to revolve, substantially as described.

3. A gas and air-mixing meter comprisdrum and an air measuring drum mounted on the same shaft or axle in a casing and having a mixing chainber between them, said drums' being constructed with helical vanes dividing them be sealed in the water at the discharging end of the drum, so that no gas can pass through when the drum is idle. The measuring compartments of the air drum being sealed in the same manner no gas can pass through them and out through the elbow pipe to the external air. The mixing meter is, therefore, perfectly safe and reliable in use. As soon as the valvein the delivery pipe leading to the burners is closed, the gas and air drums cease to revolve, and the gas as well as the mixture of gas and'air present in the casing, is held in place ready for igniimmediate use and tion when the burner valve is again opened.

In practice the measuring drums are made of greater diameter than their length, and the casing is preferably made of a diameter equal ,app'ro imately to one and half times its lengthnmTl1is feature or" construction is i portant in. the gas drum, for the reason mat-the pressure of gas is more efiective on the-driving planes in proportion to the radiai distance at whichit is exerted or applied from the axlepr above the water line in the casing.

mg a propelling gas eompartments, the e from the inlet openlclle portion, increasing i converge beyond the micleutlet openings, Whereiowing gas under pres the greatest pres alls in the gas drum, same and the air drum, e of gas and air r ran proportions same velocity and chamber, substanmm, a drum on an axle with helical vanes r the circumferential and which diverge one w. the inlet openings lti'n, forming screw ents of increasing cross converge beyond the press-u on J on an axle in the roe-a ree any two compartments open above the Water line and cause the drum to revolve.

5. In a gas and air-mixing meter, a casing of greater diameter than its length for proviclmg a'cornparatively tall column of Water to prevent leakage of gas and having inlet and outlet oaenings, a gas drum mounted casing and divided. by helical vanes into screw-measuring compartments having contracted inlet and outlet openings and of increasing cross area from the inlet openings toward the middle portions and of decreasing cross area beyond the middle to the outlet openings, whereby the currents of infiowing gas, under pres sure, will impinge with the greatest pressure upon the diverging walls of any two compartments open above the Water line and cause the drum to revolve, substantially as described.

In testimony whereof I alfix signature in presence of two Witnesses GEORGE E. COTTRELL. Witnesses:

J AMES MOLINDEN, F. M. TOPPIN.

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