US624922A - Valve for compressors - Google Patents

Description

2 Sheets-Sheet I.

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F. w. Gannon.

(Appueae'ion med Feb. 2a, 1899.)

(No Modal.)

`Inventor c a y Attorney me Noms Ps1-:as cov, vnoroumo.. wsmNe-mw. 'm c.

Witnesses No. 624,922. Patented May I6, |899. F'.VW. GURDUN.

VALVE Fon connaissons.

(Application med Feb. 2a, 1899,) (No Nudel.) 2 Sheets-Sheet 2.

Witnesses: UU Inventor W w l Attorney UNiTED STATES PATENT OFFICE.

FREDERICK W.u GORDON, OFPI-IILADEIIPHIA, PENNSYLVANIA.

VALVE FOR'COIVI PRESSORS.

SPECIFICATION forming part of Letters Patent No. 624,922, dated May 16, 1899.

Application filed February 23, 1899. Serial No. 706,473. (No model.)

T0 @ZZ w/tom/ t may concern:

Beit known that I, FREDERICK W. GORDON, of Philadelphia, Philadelphia county, Pennsylvania, have invented certain new and useful Improvements in Valves for Compressors, (Case 0,) of which the following is a specification.

Applications for foreign patents on this invention have been filed as follows: in Great Britain on October 14, 1898, in France on October 14, 1898, in Germany on October 14, 1898, and in Belgium on October 14, 1898.

This invention pertains to improvements Vin discharge-valves for fl uid-compressors, and

the invention will be readily understood from the following description taken in connection with the accompanying drawings, in which- Figure 1 is an end elevation of a compressor provided with my improved discharge-valves Fig. 2, a vertical longitudinal section at one end of the compressor-cylinder, showing the improved valves; and Fig. 3 is a similar section, on an enlarged scale, of the upper one of the valves of Fig. 2.

In the drawings, 1 indicates the compressorcylinder; 2, its piston; 3,its piston-rod; 4,its cylinder-head; 5, adischarge-chamber formed in the cylinderhead; 6, a valve cylinder formed in the cylinder-head with its axis parallel to that of the compressor-cylinder, the inner end of the valve-cylinder opening fully and directly to the compressor-cylinder; 7, asimilarly-arranged but smaller valvecylinder; 8, bonnets closing the outer ends of the valve-cylinder; 9, an inlet-chamber formed in the cylinder-,head and adapted to contain suitable inlet-valves, with which inlet-valves, however, my present invention is not concerned; 10, ports located near the inner end of valve-cylinder 6 and placing that cylinder in communication` with the discharge-chamber 5, these ports` being opened and closed by the action of a piston-valve; 11, ports placing cylinder 7 in free communication with the discharge-chamber l5, these ports bein galways open; 12, open-ended ports at the inner end of valve-cylinder 7; 13, a closed piston valve reciprocating Within valve-cylinder 6 and cooperating with ports 10, the inner end of the valve-piston as it traverses these ports serving to open or close communication between discharge-chamber 5 and the compressor-cylinder at the valve cylinder 6; 14, a closed piston-valve reciprocating within valve-cylinder 7 and coperating with ports 12, the outer or left-hand end of this piston as it traverses ports 12 serving to open and close communication bef tween discharge-chamber 5 and the oom-v time from any suitable source of motion-as,

for instance, an eccentric on the shaft of the compressor-engine; 22, a cushion-port leading from cylinder 6 to the dischargecham ber and adapted to'be overrun by Valve 13 in moving to extreme open position; 23, a cushion-port leading from valve-cylinder 7 to the discharge-chamber and adapted to be overrun by cushioning-piston 15 as valve 14 moves to position of full lap; 24, packing-.rings at the inner end of valve 13; 25, similar packing-rings atthe outer or left-hand end of valve 14, and 26 a follower on the inner end of valve 13 and clamped to place by the stem of the valve and serving as a retainer for the packing-rings of the valve,vthis follower being less in diameter than valve-cyl- .inder 6, so that the functional inner end of the valve-piston is formed by the inner face of the packing.

It is the office of tappet-arm 2O to move th two valves in the closing direction only to at least line-and-line position, the other movements of the valves being effected by the pressures upon them, and the tappet--arm in thus moving the valves requires only to exercise sucient power to overcome the mechanical friction of the valves.

In Fig. 2 tappet-arm 20 has moved the valves to line-and-line position of closure, compress= or-piston 2 having just completed its com pression-stroke and the pressure in the clear ance-space and in the discharge-chamber being equal. As compressor-piston 2 moves to xoo p the right on its suction-stroke the pressure in the clearance-space lessens by expansion, the pressure at the left of the valves therefore preponderating. The upper valve has the larger area, and consequently preponderating pressure at the left of the valves will result in the upper valve moving to the right and the lower valve moving to the left, both valves suddenly going to position of full lap, shock being cheeked by the cushioning action of piston 15 overrunning ports 23. As the two valves thus go to position of full lap valve 13 projects itself somewhat into the compressorcylinder, while valve 14 withdraws farther from the compressor-cylind er. The pressure in the discharge-chamber holds the valves in the position of full lap throughout the suction-stroke of the compressor-piston. When the compressor-piston starts to the left on its compression-stroke, the fluid confined within the compressor-cylinder becomes compressed, and the preponderance of the pressure in the disc`harge-chamber lessens till in the course of the compression-stroke'the pressure in the compressor-cylinder somewhat exceeds that in the discharge chamber, whereupon the excessive pressure acting on the upper valve will suddenly push that valve to full-open position and cause the lower valve also to go to full-open position, any shock being checked by the cushioning action ofthe left-hand end of valve 13 in overrunning port 22. The valves having gone to full-open position remain so till moved t-o line-and-line position of closure by the action ot' the tappet, as before.

Under the conditions thus far referred to the discharge valves will have promptly moved to full-open position when the pressure in the com presser-cylinder shall have slightly exceeded that in the discharge-chamber; but this action has ignored the iniu'ence of the area ofthe valve-stems. The larger valve 13 is the one of the pair which forms, soto speak, the motor of the system, its area being superior to that of the lower valve, so that suiiicient pressure acting equally on the same side of both valves will result in movement of both valves, one moving away from the pressure and the other moving toward the pressure, it being understood that the pressure in question exceeds that acting upon the opposite sides of the valves; but stem 16 unbalances the two faces of valve 13. Conse- It follows that it is not necessary in order to open the valves that the pressure in the compressor-cylinder exceed that in the discharge-chamber. The area of stem 16 may be so proportioned that the valves will fly open when the pressures in the compressor-cylinder and discharge-chamber are equal, or, if desired, the opening of the valves may anticipate the compression reaching that of'discharge.

I claim as my invention- 1. In compressor discharge-valves,the combination, substantially as set forth, of a compressor-cylinder, a pair of ported valve-cylinders each having one end in free communication with said compressor-cylinder and its other end in free communication with the discharge-chamber of the compressor,a closed piston-valve in each of said valve-cylinders,

a rocker connected with said valves to cause them to move in unison in opposite directions, and a tappet-arm adapted to move said valves in closing direction, the valves and rocker being so arranged that one of the valves serves as -a fluid-pressure motor for opening both valves.

2. In compressor discharge-valves,the combination, substantially as set forth, of a compressor-cylinder, a pair of ported valve-cylinders of dissimilar area arranged parallel to each other and communicating with the compressor-cylinder and the discharge-chamber of the compressor, a closed piston-valve in each valve-cylinder, a rocker connecting the two piston-valves to cause them to move in unison in opposite directions, and a tappetarm adapted to move the valves in closing direction.

3. In compressor discharge-valves,the combination, substantially as set forth, of a pair of valve-cylinders arranged parallel with each other and closed at one end and open at the other end to the compressor-cylinder, ports placing said valve-cylinders in communication with the discharge-chamber of the compressor, a closed piston-valve in each valvecylinder, a rocker connecting the two valves to cause them to move in unison in opposite directions, cushion-ports adapted to be overrun asthe valves approach either extremes of motion, and a tappet-arm connected with the valves and adapted to serve in moving the valves in closing direction. v

FREDERICK W. GORDON.

Witnesses:

W. C. HARRIS, VICTOR O. STRoBEL.

IOO

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