US1239566A - Unloader for compressors. - Google Patents

Description

R. CONRADER. UNLOADER FOR COMPRESSORS. APPLICATION- FILED MAY 4. i915.

Patented Sept. 11, 1917 RUDOLPH CONRADER, OF ERIE, PENNSYLVANIA.

UN LOADER FOR COlllIIElESSOItS.

Specicat on of Letters Patent.

Patented dept. 111. 191W.

Application led May 4, 1915. 'Serial No. 25,855.

To ad who/a 1i may concern.'

lie it known that l, llunonru Commune, a citizen of the United States, residing at lflrie, in the county of Erie and State of Pennsylvania, have invented new and usel'ul Improvements in Unloaders for Uoinpressors, of which the following is a specilication.

'lhis invention relates to unloadeis for compressors and consists in certain improvements in the construction thereof as will be hereinafter fully described and .pointed out in the claims. '-1' More particularly the invention. reates toiniprovements ot' the unloader described in patent issued to 111e June 225th, i910, #962,551.

The invention is illustrated in the accompanying drawing which shows a central sec tion oi' the uuloader.

1 marks the body oi' .the` valve, 2 the dia- )hra un havino' the valve o )enin and seat n l a scribed operates as an intensifier a tti 3 the valve, -l and 5 the inlet and discharge ends of the valve, either end may be the inlet. A l'ranie extends from thebody l and a cylinder 7 is arranged in this frame. A piston 8 operates in the cylinder 7 and is connected with the valve by means of a stem l). The stem extends through a spider or plate 10 havingopenings so that the shell or frame G and cylinder 7 are in c0mnnu1i-cation with one end. A spring 1l is arranged around the stem '9 :between theplate 10 and a shoulder on the stem.

A receiver connection 1Q leads to `the cylinder 13. .il piston 1l is cylinder 13. Its movement under pressure is opposed by a spring 15 and the spring 15 may loe adjusted by a screw 16. The piston carries a needle valve 17 operating in a passage 18. The passage 18 leads to the intensifying chamber 19 from which leads a lninute opening 20. The device ust (ileong the manner described in my `former patent. Slight variations :of receiver pressure move the piston 14 giving to the needle valve 17 various degrees of opening. With a slight opening of thev needle valve the escapef'of air through the minute opening is .such as t'o make a low pressure in the intensi-fying chamber'somewhat `above atmosphere. As the opening past the needle valve is increased it reaches a point where the opening 20 has little influence on the total pressure so that approximately receiver pressure will arranged in the'- Abe delivered to the intensifying chamber under these conditions. rlhis gives a Wide range of pressure in the intensifying chainber for a small variation of pressure in the receiver.

In my former structure, the `airn'as delivered lo the 'intensifier directly on the piston 8. In that device the air was passed through the valve either from theend 5 when an abrupt closing was desired or from the end .1. when a regulating eti'ect was desired. instance, with low pressure, it may be desirable to have an abrupt closing but 'where the device of my former patent was used, when the valve 3 closed the `atmospheric pressure alone on the valve with nearly a vacuum under the valve was sufficient `to retard the opening of the valve before .the pressure in the cylinder 7 was reduced prac tically .to atmospheric pressure, the reason for this being that the spring 11 cannot he of greater strength .or stiffness than can he operated by the air `on the piston 3. The air discharging from the piston 7 through the minute opening 20 is very slow and where a nice regulation especially with a small receiver is required interferes with the nice regulation of pressure. This is true where either the end 4 or the `end .5 is used, as an inlet. g

ln the present invention I introduce an `intermediate pressure controlled valve 22. This is arranged in a cylinder 23. The cylinder 23 is connected with `the intensifying chamber 19 by a passage 31 so that the pressure 4of ythe intensifying chandler is delivered to one end of `the valve 22. A spring 24 opposes the .movement of the valve 22 `and the spring may he adjusted by 4a `screw The passage n26 connects the cylinder 23 with the cylinder 7. The valve 22 has a central way 27 which normally communicates with the passage 26. The exhaust passage 2E leads from the cylinder 423 `and thspassage `is 4normally in communication with the Way 27. The exhaust passage is open `tothe ratmosphere and the size .of `the open ng may be adjusted `by a screw 29.

In :the operation of the device `when 'the receiver pressure reaches the desired amount it begins to open lthe valve 17. As the presa sure accumulates in vthe intensifying chamloer 19 and the receiver pressure increases, the pressure lon the valve l22 finally becomes sucient to move the valve, 22 suciently to Under some circumstances, as fen @lll mit

rea

uncover the passage 26. This movement; closes off the passage QG from the way 2T. As soon as the passage "lf3 is uncovered air is delivered directly to the piston 8 and the valve is 4Icl'os'ed.- 'Vhen the pressure diminishes so as to permit the valve Q2 'to close, the passage 26 is brought into communication ,withthe way The enlarged exhaustpassugev permits of the .immediate exhaust from the cylinder 8 so as to effect theopening of the valve 3.

lVhat I claim as new is :w

1. Inl ani unloader for compressors, the combinatio'nof` a valve body having inlet and discharg'ef openings and a valve seat therein; a val-ve operating on said seat; a fluid actuated motorcontrolling said valve; a pressureactuated valve controlling said motorga cylinder in'vvhich the pressure actuated valveoperatesfsaid cylinder having an finlet port ,admitting fluid 'to the end of lthe valve. and-subjecting `the valve to the pressure'l'therefrom;- a portV leading to the fluid actuated motor and tlxeexhaust port, said port leading to thefluid actuated motor being covered by the valve as it is operated and'being connected as the valve is operated with either the inlet port or the exhaust port; counterpressu're means opposing the movement of the valve; a needle valve controlling 'sai'd inlet port; and a pressure m'otor controlling said needle valve.

2. In an unload'er for compressors, the

combination of a` valve body having inlet and discharge/openings; and a valve seat; a relief valve opening and closing by a movement toward and from its seat; a fluid actuated motor controlling said valve; a pressure actuated valve controlling said motor,

said valve having'a pressure passage and an f macteo i exhaust passage controlled' by the. valve; and an intensifier connected with said pressure actuated valve and controlling the delivery of air to said pressure actuated valve said intensifier comprising a chamber; a gradually opening needle valve controlling the admission of fluid to said'chamber; and

a minute discharge opening from 'said cham-Y ber. .n

3. In an unloader for. compressors, the

Acombinationhof a valve body having inlet and discharge openings and a valve seat therein; la valve operating on said seat; av

fluid actuated motor controlling said valve;

a pressure actiiated valve controlling said motor; a cylinder inwhieh the pressure actuated valve operates, said cylinder having an inlet port' admitting fluid to the end of the valve and subjecting the valve to the pressure therefrom;'a port leading to the Ifluid actuated motor; and an exhaust port,

said port leading to the fluid actuated motor being covered by the valve as'it is operated and being connected as the valve is operated with either the inlet port or the exhaust port; counter-pressure means opposing the movement of the valve; and an intensifier controlling the movement of air to the inlet port, said intensifier comprising a chamber; a gradually opening needle valve controlling the movement of fluid to the chamber; and a minute discharge opening.' leading from the chamber. i*

In testimony whereof Ihave hereunto se 7a my hand in the presence of two subscribing witnesses.

RUDOLPH CONRDER.

Witnesses:

H. o. LORD, B. M. HARTMAN.

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