US558408A - John murray mitchell - Google Patents

Description

(No' Model.)' 2 ShetsSheet 1.

J. M.-MITOHELL.

MACHINE FOR MIXING GOMBUSTIBLB GAS AND AIR.

No. 558,408 Patented Apr. 14, 1896. I

WITNESSES: Q/AM l/VVE/VTOI? ANDREW B GRAHAM. PHGTO-UTNQ WASHINGTON. D12

(No Model.) 2 Sheets--Sheet 2.

J. M. MITCHELL. I MACHINE FOB MIXING OOMBUSTIBLE GAS AND AIR.

No. 558,40'8. PatentedApn' 14, 1 896.

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AMIREW llGflAllAM, PHOT0-UTHO.WASH INGTOIL u c UNITED STATES PATENT OFFICE.

JOHN MURRAY MITCHELL, OF NEW YORK, N. Y.

MACHINE FOR MIXING COMBUSTIBLE GAS AND AIR.

SPECIFICATION forming part of Letters Patent No. 558,408, dated April 14, 1896. Application filed December 23,1889. SerlalNo. 334,781. (roman To all whom it may concern.-

Be it known that I, JOHN MURRAY MITCH- ELL, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Machines for Mixing Combustible Gas and Air, of which the following is a specification.

This invention relates to improvements in air and gas mixers.

It has for its object the provision of such a device whereby air and gas can be mixed in any desired proportions.

The invention consists primarily of two compressors adapted to respectively force air and gas into a common receptacle in such a manner as to be thoroughly mixed. These compressors are operated at the same rate of speed, relatively, and the quantities of air and gas forced into the mixture are regulated without changing the speed of the compressors, by moving certain valves or gates which control certain ports in each compressor.

The invention also consists in the novel construction, combination, and arrangement of parts, such as will be hereinafter more fully described, pointed out in the appended claims, and illustrated in the accompanying drawings.

In the accompanying drawings, in which similar letters and numerals of reference designate corresponding parts, Figure 1 is a vertical transverse section of a machine embodying the invention, parts being in elevation; and Fig. 2 is a longitudinal vertical section of the same, parts also being in elevation.

Referring to the drawings by letters and numerals, A and B respectively designate the chambers in which the air and gas compressor pistons are located.' In the present instance the chambers are represented as being cylinders, which with the compressor-pistons respectively located in the same are of exactly the same construction, only varying in size. As the description of one can be applied equally as well to the other, the chamber A and the compressor-piston located therein, being the larger, will be described.

The chamber A has an inlet-port 1 and an outlet-port 2, each enlarged at the inner end by a recess 3, which recesses extend in opposite directions. Within the chamber A is located a compressor-piston whereby air can be drawn into the chamber through the port 1 and expelled through the port 2, mechanism being provided whereby the amount of air compressed and forced through the eductionport can be regulated as desired. In the present instance the compressor-piston consists of the cylindrical piston-body 4, eccentrically mounted within the cylindrical chamber A, being mounted 011 the shaft 5, suitably journaled in the sides of the casing, and the sliding wings 13. The relative arrangements and dimensions of the compression-piston and the cylindrical chamber are such that a part of the former will contact with the inner face of the latter through its entire length.

'WVithin the cylindrical piston-body 4 the chamber 15 is formed and provided at opposite ends with a slot 12. On each side of the said chamber 15 a sliding blade or paddle 13 is mounted, which is provided with an arm 14, passing through a slot 16 in the side wall of the chamber. A spring 45, suitably connected with the piston-body and the arm 14 of the sliding blade or paddle, serves to draw or pull the latter out of the piston-body and press its outer edge against the inner surface of the cylindrical chamber A. By the rotation in the proper direction of the piston air is drawn into the cylindrical chamber through the port 1 and is forced out through the port 2.

The compressor-piston is provided with a mechanism whereby the amount of air forced out of the chamber can be regulated. This mechanism will now be described.

The sliding blade 13 is provided with a port or opening 17, which can be closed more or less or entirely by a sliding gate or valve 18 resting against the blade and projecting with the latter through the slot 12 of the cylindrical piston-body. Said gate or valve 18 is provided with an arm 19, with which is connected a spring 20, fastened to: the end wall of the chamber 15. This spring serves to draw or pull the gate outward so as to close the port 1'7.

A mechanism for adjusting or regulating the movement of the gate or valve 18 is provided. The shaft 5, journaled in opposite sides of the casing 7 and on which the piston-body 1 is mounted, is hollow or tubular.

arm 12 projects laterally from the inner end of the sliding gate 18'and by the spring 20 is pressed against the conical piece 8. By movin g the conical piece the sliding gate can be moved to cover the port 17 of the blade 13 more or less, as it may be desired. The blade 13v is provided at its outer end with a projection 46, which serves to engage with the sliding gate 18 to withdraw the latter at the same time the blade is forced into the recess 15 by the curved face of the cylindrical chamber. In the opposite side of the recess a sliding paddle or blade and gate precisely like those first described are arranged.

The inlet-port 1 of the cylindrical chamber A is connected with a pipe 25 for conducting air to the said chamber, and the inlet-port 1 of the cylindrical chamber B is connected with a suitable pipe 26 for taking gas to the said chamber 13. The outlet-port 2 of the cylindrical chamber A is connected with a suitable pipe 27 for carrying 01f the compressed. air, and the outlet-port 2 of the cylindrical chamber 13 is connected with a pipe 28, terminating in a nozzle 29 within the pipe 27, thereby forming an injector by means of which a current of compressed gas is injected into the current of compressed air generated in the cylinder A.

Means suitable in the premises are provided for rotating the compressorpistons within their respective chambers at the same rate of speed.

The operation of the device is as followsz As the compressor-pistons are rotated the paddles 13 13 are alternately pressed into the piston-body and forced out of the same, the outer ends of the said paddles at all times remaining in contact with the inner surfaces of the cylindrical chambers A and B. These rotating paddles draw in and compress the gas and air. According to the quality or richness of gas-that is, according to the amount of hydrocarbon contained in the same-tl1e quantities of gas and air mixed must be re ulated. This is accomplished by turning the spindle 10 to move the conical piece 8 to separate more or less the arms 12 12, and conse-. quently the sliding gates 1818, to which they are attached. By moving the gates outwardly as far as possible it will cause the compressor to operate to its fullest capacity. By withdrawing the gates, so as to open the ports 17 17, the capacity of the compressors will be diminished, inasmuch as a certain amount of air, which would otherwise be forced in front of the paddles, would escape through the openings.

It is obvious that by moving the gates controlling the ports of either the gas or the air compressor, the proportions of air and gas forming the mixture can be varied.

Having thus described my invention and set forth its merits, What I claim, and desire to secure by Letters Patent, is

1. In an air and gas mixer, the combination of a chamber provided with induction and eduetion ports, a compressor-piston within said chamber and having a port formed in a part thereof, an adjustable gate to said port for partially or entirely closing the same, to regulate the quantity of air or gas to be compressed and pumped, and means for positively adjusting said gate, substantially as and for the purposes described.

2. In an air and gas mixer, the combination of a chamber provided with induction and eduetion ports, a compressor-piston mounted within the said chamber and having a part thereof provided with a port or ports, and means for varying the area of said port or ports to regulate the quantity of air or gas to be compressed and pumped, substantially as described.

3. In an air and gas mixer, the combination of the chamber, the compressor-piston mounted therein consisting of the piston-body, and the blades carried by the said piston-body, the said blades having valve-controlled ports, substantially as described.

4:. In an air and gas mixer, the combination of the cylindrical chamber, having induction and eduetion ports, the compressor-piston mounted therein consisting of the piston-body eccentrically journaled in the said chamber and the sliding blades or paddles carried by the piston-body, and provided each with a valve-controlled port, said blades being adapted to be projected and withdrawn in alternation with each other, substantially as described.

5. In an air and gas mixer, the combination of the chamber having induction and eduction ports, the compressor-piston mounted therein consisting of the piston-body in the said chamber, the sliding blades or paddles carried by the said piston-body provided with ports, and the sliding gates adapted to control the said ports, substantially as described.

6. In an air and gas mixer, the combination of the cylindrical chamber having induction and eduetion ports, the compressor piston mounted therein consisting of the cylindrical piston-body eccentrically journaled in the said chamber, the sliding blades or paddles carried by the said piston-body provided with ports, and the adjustable sliding gates adapted to control the said ports, substantially as described.

7. In an air and gas-mixer, the combination of the cylindrical chamber having the induction and eduetion ports the compressor-piston mounted therein consisting of the cylindrical piston-body eccentrieally journaled in Signed at New York, in the county of New York and State of New York, this 21st day of IO the said chamber, the spring-pressed sliding December, A. D. 1889. blades or paddles carried by the said pistonbody, the said blades 01' paddles being provided with ports, and spring-pressed gates controlling the said ports, substantially as described,

JOHN MURRAY MITCHELL.

Witnesses: I

EMIL A. JULY, R. EMMET DOHERTY.

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