US1474590A

US1474590A - Controlling mechanism for compressors

Info

Publication number: US1474590A
Authority: US
Inventors: Fred D Holdsworth
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1917-04-27
Filing date: 1917-04-27
Publication date: 1923-11-20
Anticipated expiration: 1940-11-20

Description

Nov. zo, 1923.

F. DLHQLDswoRTH CONTROLLING MECHANISM FOR COMPRESSORS Filed-April 27 WMM Hummm:

r im gPatented Nov. 20, 1923.' y

nir. stares FRED D. HOLDSWORTH, 0F CLAREMONT, NEW HAMPSHIRE, ASSIGNOR 'T0 MACHINERYCOMPANY, A. CORPORATION 0F MASSACHUSETTS.

SULLIV con'rnomme Mauretanien V.ron eomranssons.

Application filed April 27, 1917.

To all whom t may concern Be it known tl :,.t I, FRED l). HoLDswon'rH, a citizen of the United States, residing at Claremont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful Improvements in Controlling Mechanisms for Compressors, of' which the following is a full, clear, and exact specification. l

My invention relates `to controlling mechanisms for compressors.

It has for its object to provide an improved controlling mechanism for compressors or the like, whereby when the pressure developed thereby has exceeded a predetermined limit the compressor is automatically unloaded and again loaded when the pressure has dropped below a predetermined limit. A further and more specific object of my invention is to provide improved means for accomplishing the above objects, especially adapted to use in connection with inletl valves of the suction type, the same having improved 'means whereby all delay in the seating of said valves when the compressor is to be loaded is effectually overcome.

In the-accompanying drawings, I have shown for purposes of illustration one embodiment which my invention may assume in practice.

In fthese drawings,-

Fig. 1 is a side elevation of a compressor system equipped with my improvement, a portion of the compressor cylinder being broken away tofacilitate illustration.

Fig. 2 is an enlarged view'of the regulator shown in partial section.

Fig. 3 is a further enlarged detail of the exhaust controlling Valve mechanism forl the regulator.

In this illustrative construction, I have shown a compressor 1 which may beof an standard construction, equipped with a cy inder 2 and a piston 3 and having air supplied to its cylinder through suction inlet valves 4 and discharged therefrom through suitable discharge valves 5 and'through a pipe connection 6 leading to a receiver 7. As shown, the inlet valves 4 are provided with stems 8 normally held in projected position bly means of springs 9 in 'such a manner as to seat the valves. Disposed beneath these valves are also cylinders 10 in which move pistons 11 adapted to engage the stems ofthe valves and lift the same from ltheir serial no. 165,006.

is also provided with a cylinder 17 in which y is disposed a piston 18 normally held in depressed posltlon by a coiled spring 19, the

.tension of which is adjustable by means of a threaded adjustingl nut 20 threaded in the upper end ofthe cylinder. Upon the lower en of thls piston 18 is also carried a valve or pin 21, herein having a conical point,

adapted to be received in a suitable round orifice 22 in'vthe bottom of the cylinder, which is shown herein as located in a plane. below the inlet 15. As illustrated, this orifice-22 opens into a lower chamber 23 havpgcommunication with the outlet 16.

1th1n this chamber 23 is also carried a .threaded plugl 24 having threaded upon its reduced upper end 25 a valve housing 26 provided wlth one or more lateral orifices 27 communicating with the outlet 16 and a central orifice 28 opening under the orifice 22. Within this valve housing 26 is also carried a valve 29, preferably 1n the form of a plate or discfnormally held in elevated position by means of a coiled spring 30 housed withinl an axial chamber 31 in the plug 24. As shown, this valve 29 is also provided with a leakage orifice 32 therein adapted to permit the leakage of pressure fluid through the same and through the spring chamber 31 to an outlet passage 33 disposed coaxiall with the plug 24 and *communicating with the atmosphere.

In the operation of my improved regulator, it will be noted that when the pressure 1n the receiver 7 rises above a predetermined .point, the same will act upon the bottom of the piston 18 in such a manner as to raise the same from the position shown `in Fig. 2. As this piston-moves upward,

the communication to the atmosp piston. Thus, a supply of pressure' fluid will be free to pass from the receiver through the inlet, 15 and the orifice 22 1n such a manner as to depress the disc valve 29 against the action of its spring 30 and permit the pressure fluid to fiow through the orifice 28 and out fices 2T in the valve housing 26 to the outlet 16, through which it passes to the pi e connection 12 in order to act on the p ungers 11 and raise the suction valves 4 from their seats to unload the compressor. Obviously, so long as the pressure in the receiver' exceeds a predetermined amount, the same will thus act upon the suction valves and hold the same from their seats in such a manner as to hold the compressor unloaded. lt will be noted, however, that due to the leakage port 32 in the disc valve 29, a certain amount of air beneath the plungers 11 will be escaping all the time through this leakage 'ort and the passage 33 to the atmosphere. Vlien, moreover, the pressure in the receiver drops below a predetcrmined limit, the piston 18 will be lowered due to the action of its spring 19, in such a manner as to close the orifice 22 and thus sluit off' the supply of air to the valve pistonsll. After this occurs, there will he a short period of leakage through theleakagc port 32 inthe valve 29 before the pressure in the

pipe connection

16, 12 etc. becomes less than the pressure of the .s ring 30. When, however, this pressure liras been depleted through this leakage, and the spring becomes sufficiently )owerful to throw the valve 29, it will lift this valve to the position shown in Fig. 3 and by so doing open the pipe connections 12 to the atmosphere through the

ports

27 and 33. As a result, the air in the pipe connections 12 and beneath the plunger 11 will be exhausted therefrom with a rush and the valves 4 will be seated very quickly. 0hviously, this sequence of operation will be repeated in accordance with variations in pressure in the receiver 7.

ln the use ofmy improved construction, it will be noted that due fo the provision of my improved means, whereby a certain amount of leakage is permitted from beneath the suction valve operating pistons and the exhaust controlling valve 1s then thrown in such a manner as toy oplen wide ere, the suction valves are caused to close with a decidedly quick movement as distinguished from any such delayed closing movement of the same as would result`in a loss of efficienc of the compressor. lt will also be note that an exceedingly simple and cheap construction is produced, it only` being necessary to machine a single cylinder. It desired, even this cylinder, under certain conditions, may be roughly bored, an expansible cupped washer 34 then belng suitably clamped through the lateral orion a reduced end 35 of the piston 18, as by means of a washer, 36 and bolt 37. rEhesc and other advantages of my improvement will, however, be apparent to those skilled in the art. f

While l have in this application specifically described one embodiment which my-inven tion may assume in practice, it is of course to be understood that the invention may be modified and embodied in various other forms Without departing from its spirit, it being my intention to include all such modifications` within the scope of the appended claims.

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

1. The combination with a compressor, of a fluid operated unloading mechanism, and controlling means therefor' for varying the exhaust therefrom without interrupting it.

2. The combination with a compressor, of a fluid operated unloading mechanism, and. controlling means therefore for automatically varying the exhaust therefrom without interrupting it. f

3. The combination with a'comprcssor, of a fluid operated unloading mechanism, and controlling means therefor for increasing the exhaust therefrom during the loading of the compressor Without interrupting it.

4. The combination with a compressor having a discharge pipe and fluid pressure operated unloading mechanism, of a comressor cont-rolling means comprising av conuit connecting said pipe and said unloading mechanism, and means in said conduit for controlling a flow of pressure fluid to said unloading mechanism, for maintaining the pressure of the fiuid in said mechanism substantially constant during the unloading of the compressor, and for providing an aecelerated uninterrupted exhaust for the pressure fluid from .said mechanism when said compressor is to be loaded.

5. The combination with a compressor having a discharge pipe and fluid pressure operated unloading nuclia-nisni, of' a compressor controlling means comprising a conduit connecting said pipe and said unloading lnechanisn1,'aml means in said conduit for controlling a fiow of pressure fiuid to said unloading mechanism, for permitting a slow exhausting of pressure fluid from said mechanism during the unloading of the compressor, and for automatically accelerating the exhaust of the pressure fluid, without interrupting the same, from said mechanism when said compressor is to be loaded.

6. ln a compressor controlling mechanism, in combination, a compressor, one or more inlet valves therefoiya receiver connected to said compressor, pressure actuated mechanism for actuating said inlet valves, a fluid connection between said receiver and said mechanism, a pressure controlled valve Illi anism, in combination, a compressor, one or more inlet valves therefor, .a receiver connected to said compressor, pressure actuated mechanism for actuating said -inlet valves, a fluid connection between said receiver and said mechanism, a pressure controlled valve controlling said connection, and a cooperating valve between said valve and said inlet valve actuating mechanism operative upon opening of. said first mentioned controlling valve to provide a small exhaust connection in communication with saidinlet valve acv tuating mechanism, and after closin of said first mentioned valve to open a supp emental exhaust connection which remains open until said controlling valve again reo ens.

8. In a compressor contro ling mech- 'auism, in combination, a compressor, one or more inlet valves therefor, a receiver 'connected to said compressor, pressure actuated mechanism for actuating said inlet valves, a fluid connection bet-Ween said'receiver and said mechanism, a pressure controlled valve controlling said connection, and valve means between'said valve and said inlet valve actuating mechanism Comprising a cooperating valve operative upon opening of said first mentioned controlling valve to provide a small connection with the exhaust in communication with said inlet valve actuating mechanism, and upon closing of said first mentioned valve to open a supplemental exhaust connection while said initial connection remains open.

9. In a compressor controlling mechanism in combination, a compressor, one or more inlet valves therefor, a receiver connected to said compressor, pressureactuated mechanism for actuating said inlet valves,

a Huid connection between said receiver and said inlet valve actuating mechanism, a pressure controlled valve controllin said connection, an exhaust port in said connection, and auxiliary valve l means operative in opposite' positions to provide a limited connection with said exhaust or a relatively large connection with said exhaust and movable from one position to the other without interrupting communication between said fmechanismand the exhaust. y Y

10. A controlling valve for use in compressor u nloadin mechanisms comprising a casing, a porte partition therein, a connection for compressor discharge pressure tion, and means including a second inlet valves,

o n one side of said partition and a connec, tion -for compressor unloading mechanism actuating means on the other side of `said partition, a pressure controlled valve ony one side of the'paitition controlling the port in said partition, an exhaust port on' the opposite side of said partition, a 'cooperating valve operative in opposite positions to scat over said exhaust port and provide a limited exhaust therethrough or to uncover said exhaust port entirely, and a port communieating with the connection for unloadingl vmechanism actuating means across which said valve moves and of greater length than the length of said valve in the direction of its movement.

11. In a compressor controlling mechamsm, in combination, a compressor, one or more inlet valves therefor, a receiver connected to said compressor, a connection between said receiver and said inlet valves, pressure actuated plunger mechanism disposed in said connection for actuating said inlet valves, a valve controlling said connecvalve constantly communicating with the atmosphere operative after the closure of said first named controlling valve and a predetermined drop in pressure in a portion of said connection to provide an accelerated exhaust of the air beneath 'said plunger mechanism without interrupting said exhaust.

l2. In a compressor controlling mechai nism, in combination, a compressor, oneor more inlet valves therefor, a receiver connected to said compressor, a connection between said receiver and said inlet valves, pressure actuated plunger mechanism disposed in said connection for actuating said a valve controlling said connection and responsive to variations in receiver pressure, and means including a cooperating .valve in said connection opened by receiver pressure after opening of said Hrst mentioned controlling valve and operable after the closure thereof to provide an accelerated exhaust of the air beneath said plunger without interrupting said exhaust.

A13. In a compressor controlling mechanism, in combination, a compressor, one or more inlet valves therefor, a receiver connected to said compressor, a connection between said receiver and said valves, pressure actuated plunger mechanism disposed in said connection for actuating said inlet valves, a valve controlling said connection and responsive to variations in receiver pressure, and a cooperating valve in said connection having an opening therein constantly communicating with the atmosphere, said valve being opened by receiver pressure after opening of said first mentioned .controlling tion of said connection to provi e acceler-l in said portion ated exhaust of the fluid exhaust therewithout interruption of the from.

14. ln a compressor controlling mechanism, in combination, a compressor, one or more inlet valves thereforga receiver connected to said compressor, a connection bctween said receiver and said valves, pressure actuated valve actuating mechanism disposed in said connection, a valve mechanism normally closing said connection and responsive to variations in receiver pressure; and a cooperating valve mechanism re*- sponsive to receiver pressure upon opening ot' said first mentioned controlling `valve mechanism and operable after closure thereof and a predetermined drop in pressure in a portion of said connnection leadin v to said actuating mechanism to open a ,ree communication longitudinally of Said valve between said portion and the atmosphere.

l5. In a compressor controlling mechanism, in combination, a compressor, one or more inlet valves therefor, a receiver connected to said con'iprcssor, a connection between said receiver and said valves, pressure actuated valve actuating mechanism disposed in said connection, a valve mechanism normally closing said connection and responsive to variations in receiver pressure, and a cooperating valve mechanism responsive to receiver pressure upon opening of said first mentioned controlling valve mechanism and formino a constant communication with the atniosp 1ere operative after closure of said first mentioned controlling valve mechanism and a predetermined drop in pressure in a portion of said connection lead'- ing to said actuating mechanism for opening, without interrutiono the exhaust, an enlarged exhaust or the air within said portion. A

16.. In a compressor controlling mechanism, in combination, a compressor, one or more inlet valves therefor, a receiver connected to said coml'ircssor, a connection bctween said receiver and said valves, pressure actuated mechanism disposed in said connection for actuating said inlet valves, means forming a port in said connection, a valve responsive to variations in receiver pressure controlling communication through said port, and a cooperating valve mechanism disposed on the opposite side or said port and responsive to receiver pressure upon opening of said second mentioned valve and to a drop in pressure when the latter is closed for e'ecting a varied but uninterrupted communication between said inlet valve actuating mechanism and the atmosphere.

aar/'aseo 17. lin a compressor controlling mechamsm, in combination, a compressor, one or more inlet valves therefor, a receiver connected to said compressor, a connection between said receiver and said valves, pressure actuated mechanism dis )osed in said connection for actuating sai inlet valves. means forming a port in said connection, a'. valve responsive to variations in receiver pressure controlling corrununicat'ion through said port, anda cooperating valve mechanlsm forming a constant communication with the atmosphere and disposed on the opposite side of said port and responsive to receiver pressurepupon opening of said first mentioned controllin valve and operable upon a predetermine drop in pressure in a portion of said connection after closure of said first named controlling valve to open, without closure of said first mentioned communication, free communication between said inlet valve actuating mechanism and the atmosphere.

18. In a compressor regulator, in combina- I tion, a valve casing having a plurality of chambers therein, one provided with an inletand the other provided with an outlet, a valve reciprocable in one of said chambers and having a conical end, means forming a division wall between said chambers and having a )ort therein in which the conical end or sait valve is normally seated, a ported valve member coaxial with said last inentioiied valve located on the opposite side oi the division wall and in the other of said chambers having constant communication with the atmosphere, and means formino an enlarged port normally closed by said last mentioned valve and providing a communication between said chamber and the atmossplliere in a predetermined position of said va ve.

19. A compressor regulator 'having a' chamber adapted for communication with a compressor, a valve to control communication between the compressor and said chamber, and a separate, independently-operable relief valve coinplelnentary to said chamber and constructed and arranged to remain open until the first valve has opened a predetermined distance and to then be closed to practically close communication with the atmosphere and. also constructed and arranged to remain closed until the pressure is reduced to a predetermined extent and to then promptly open and afford free oominunication to the atmosphere, whereby positive action of the regulator is insured.

In testimon whereof l aiiixm si atm-e.

than D. Honnsviforn. c

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