US990616A - Gas-pump. - Google Patents

Description

Patented Apr. 25, 19H.

R.' WHITAKER n E. LOWE.

GAS PUMP."l

, APPLICATION-FILED 00121, 1907.

R. WHITAKER & E. LOWE.

GAS PUMP,

APPLICATION FILEDA 00T. 1, 1907.

Patented A131225 19u.

Z SHBETS-SHEET 2.

ATTORNEY RICHARD WHITAKER ND ELMER LOWE, OF SIGNORS TO THE BRUNSWICK REFRIGE NEW JERSEY, A CORPORATION OF NEW J NEW BRUNSWICK, NEW JERSEY, As- RATING COMPANY, or NEW BRUNSWICK, EnsEY.

GAS-PUMP.

Specification of Letters Patent.

Patented Apr. 25, 1911.

Application filed October 1, 1907. Serial No. 395,323.

To all wtom it may concern:

Be it known that we, RICHARD WHITAKER and ELMER Lowa-,- citizens of the United States, and residents of New Brunswick, in the county of Middlesex and State of New Jersey, have invented certain new and useful Improvements in Gas-Pumps, of which the following is a specification.

The invention relates to improvements in gas-compressing pumps, and pertains more particularly to improvements in pumps of the character shown and described inthe following Letters-Patent heretofore granted to Richard Whitaker, to-wit: No. 795,014 dated July 18, 1905, No. 795,015 dated July A18, 1905, No. 821,563 dated May 22, 1906 .and No. 848,277

dated March 26, 1907 The objects of the present invention are generally to simplify and increase the efliciency of the pump and the system in which the pump may be connected, and more specifically Vto prevent the ammonia gas from leaking by the piston and entering the chamber in which, with a liberal quantity of lubricant, are contained the eccentric and rod for operating the piston, and to avoid the danger of abnormal or excessive discharge pressures either in the pump'or the piping or parts connected therewith, it being entirely convenient in accordance with the present invention to prevent the creation of a dischargepressure in excess of a predetermined limit. These objects and other advantages are attained. by the mechanism hereinafter described and illustrated in the accompanying drawings, in which:

Figure 1 is a central vertical section of the cylinder portion of a compressor-pump constructed in accordance with and embody# ing our invention, the piston being indicated in .its lower position; Fig. 2 is a side-elevation of the same, the piston being indicated in its upper or compressing position; and Fig. 3 is a top view, partly broken away7 of the same. s

ln the drawings, 10 designates the pump cylinder, n11 the piston therein having in it the gas inlet valve l2, 13 the supply pipe for gas, 14 the discharge pipe for compressed gas, 15 the pressure-valve, and 16 a pressurev controlling and relief valve mounted 1n said valve 15 and capable of operationindependently thereof. y

The piston 11 is of elongated form and provided adjacent to its upper and lower ends with sets of rings 17, 18, between which said piston is formed with a through transverse chamber 19 and an external annular chamber 20 in communication therewith, The chamber 19 is elongated vertically and always in register with the gas supply pipe 13. Iny the upper or head end of the piston 11 is seated' the gas inlet valvel 12, said. valve having a downwardly and inwardly converging periphery adaptfed to a correspondingly-formed seat 21 on the piston and a steml 22 which extends downwardly through a snugly receiving hole in the upper end of said piston and is exposed below the same inthe gas-chamber 19, wherein the lower end of said stem is provided with a tension spring 23 and nut-24. The spring 23 exerts its force to normally hold the valve 12 on its seat and'its tension may be regulated by the adjustment of the nut 24 toward 'and from it. llVithin the vertical vplane of the outline defined by the valve-seat 21, the piston 11 is formed with vertical ports 25 which are in permanent communication with the gas-chamber 19 'and up through which the gas, upper side of theliead of the piston when during the descent of the latter the'suction thereby created elfects the elevation of the valve 12 from its seat.

The lower end of the piston 11 is formed with the usual socket 26 to receive the upper end of the customary driving eccentric-rod, said rod as shown in the aforesaid Letters- Patent No. 848,277 being conveniently driven from an eccentric secured on adriving shaft and inclosed within a base-casing upon which the cylinder 10 is mounted and within which is provided a liberal supply of oil for lubricating the working parts therein. We do not show the said basecasing with its oil chamber and eccentric nor the whole of the eccentric-rod for driving the piston 11, since they, same are fully shown and described in the aforesaid Patent 848,277. The cylinder `10 is vertical and entirely open at its lower end, as shown in Fig. 1, and at said end is constructed to seat within a socket in said base-casing. A difficulty experienced in the employment of the pump shown in said Patent 848,277 is thatythel gas will leak down the sides of the piston and enter the for compression, may pass to the vents the leakage of the` gas into the oilcha'inberY` '1n/the base-casing and simplifies the pump'and increases its etliciency and the efficiency of the system employing it.

lVithin the lupperl end of the cylinder 10 is a chamber 27 at whose base is formed, on the inner laterally extended wall of the cylinder, an annular seat 28 for the pressurevalve 15, which is normally held upon said vseat by a spring 29 confined between it and the head of the cylinder. The valve 15 is formed in itsperiphery with an annular chamber 30, which when said valve is on its seat is in direct communication with thev discharge pipe 14. The chamber 30 is defined by the side wall 31 ofthe valve .15, the lower surface lot theiupper encompassing flange 32 onsaid valve and the upper surface of the lower encompass- The langes ing flange 33 on said valve. 32, 33 are removed at segmental portions of their peripheries, as at 3/1 (Fig. 3), to form openings which place the chamber 30 in permanentA `communication with the chamber 27 above the, valve 15 and permit the compressedfgas, upon the elevation of the valve 15A from its seat, to enter the p ychamber 30.

In the valve 15 is provided a pressure control yalve '16 whose Vconical peripheral edge isiadapted to a correspondingly formed seat on .the valve 15 and whose stem 35 extends 'upwardly through a snugly receiving hole in said valve 15 and has upon its upper portion ay tension spring 36 and nut 37, said spring exertingits force to normally ret-ain the valve 16 on its seat and said nut being providedhto regulate the tension of said spring'J or 'setthe ,same to resist the opening of thevalvet 16funde`rl any normal gas-pressure het..chamberl27l and to permit the opening`-go`fff` valve 16 should, for any reason,the "gafs-,pre ssure in said chamber become. siv'clor abnormal `or greater than the` predetermined amount therefor. .The valve 15k isformjed within thevertical plane of the periphery ofthe valve16 with ports 38 which are sealed by thevalve 16 when the latter is on its vseat andl communicate withv the cylinder 10 below the pressure valve 15 when said valve 1-6 is oil' its seat. The ports 38"always remain `sealed except in the event `of the creation of abnormal gas-pressure in the chamber 27, when the valve 16 will open and permit such pressure to be" relieved through the ports 38.

The valve 16 enables the prevention of a gas-pressure in the chamber 27 or discharge plpe 14 or parts connected therewith beyond a predetermined maximum degree, and this is of very great. importance in many respects, as, for example, if, in the absence .of the valve 16, the operator should set or continue the pump in operationv and neglect to open the valve or valves in the line lead- 4ing therefroma great and possibly disastinue in operation without damage. The4 valve 16 thus serves to control the maximum degree of gas-pressure which may be created in the chamber 27 and discharge line by the compressor, any excess of such pressure being relieved by the opening of said valve thereby.

The operation of the compressor will be largely understood from the foregoing description. The supply-gas will be admitted to the chamber 19 in the piston 11, and during each down or suction stroke of the piston the valve 12 will open and permit a .proper charge of the gas to pass upwardly through the ports 25 to the space above the piston.v Durlng each 11p-stroke of the piston 11 the .charge of gas above it willbe compressed agtnst the pressure valve-15, which elevating from its seat will permit the compressed gas to enter the annular chamber 30,

chamber 27 and discharge pipe ,14. Any excess of pressure or pressure beyond the predetermined limit in the pipe 1'4 and chamber 27 will open the valve 16 and be relieved thereby. The gas in the su ply chamber 19 is sealed at the upper and Ilower ends of the piston by the rings 17, 18. A very important advantage derived from the location of the chamber 19 intermediate the ends of the piston 11 and scaling the same by the rings 17, 18 is that any gas leaking down- Wardly around the upper end of the piston will return to said chamber and enter the.

ends of the same. The lower .rings 18 also tend to prevent the lubricant in the usual acacia .gas became Lmore or less heated by the heat generated by the discharge pressure.

What we claim as our invention and de` sire to secure by Letters-Patent, is:

1. In a pump of the character described, a cylinder, a pressure-valve controlling the discharge,- an automatic independently operative valve for relieving abnormal discharge pressures by4 opening a passage, under said pressures, leading to the compression side of said pressure-Valve, a piston in said cylinder packed at both ends and having a gas supply7 ch-amber between said ends, and a suction-valve in said piston; substantially as set forth.

2. In a pump of the character described, a

cylinder, a pressure-Valve controlling the discharge, `an automatic .independently operative valve for relieving abnormal \discharge pressures by opening a passage,

under said pressures, leading to the compression side of said pressure-valve, a piston in said cylinder,l a suction-Valve in said piston, and means for supplying gas to the passage normally closed by said suction- Valve; substantially as -set forth.

3. In a pump of the character described, a

cylinden a pressure Valve controlling the discharge and formed with an annular encompassing chamber and vupper and lower iianges containing' passages for the gas to said annular chamber and the chamber' `abovesaid valve, a spring normally holding said valve on its seat,aii independently operative pressure control .or relief valve seated in said pressure valve, a spring normally holding said control valve on its seat,

a piston in said cylinder, a suction-valve iii said piston, and -nieaiis for supplying gas to the passage normally closed by said suctionvalve; substantially as set forth.

Signed at New Brunswick, New Jersey, this 26th day otSeptember, 1907.

RICHARD VVHITAKER.

ELMER LOWE. Witnesses:

` FRED-M. Joiner,

F. E. @FISI-inn.

Images