USRE14662E - Ustloader for compressors - Google Patents

Description

H. V. HAIGHT. UNLOADER Fon CoMPREssoRs,

APPLICATION, FILED APR. IBI).

Reisslml une 10, 1919.

mal/.MW

Tra/Mfr II. V. HAIGHT.

UNLOADEB FOR coMPREssoRs.

APPLICATION FILED APR. 7. 19|9.

Reixsnvd June 10, 1919. 14,662.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

HARRY V. HAIGHT, F SHERBROOKE, QUEBEC, CANADA, ASSIGNOR TO INGERSOLL" RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

UNLOADER FOR COMPRESSORS.

Specification of Reissuecl Letters Patent. Rpissued June 10, 1919 Original No. 1,291,854, dated January 21', 1919. Serial No. 152.019, filed March 2, 191'?. Application fory reissue filed April 7, 1918.

I T 0 all whom 'it may ron/1ero: i

Be it known that l, HARRY V. HArGirr1 a subject of the King et' England7 residing at Sherbrooke, in the Province of Quebec,

Dominion ot Canada, have invented certain new and useful Improvements in Unloaders for Compressors, of which the following is a specification.

This invenition 'relates to compressors and in particular to intake valves for admitting the Huid to be compressed and also arranged to regulate the load on the compressor.

'Ihe objects of my inventionare to provide a compressor with a valve casing carrying a plurality of valves adapted to admit iiuid tothecompressor and which may he thrown out of operation to partly or complete-ly relieve the load on the compressor.

With these and other objects -in View, my

invention consists in the features of construction and operation slet forth in the following specication and claims and illustrated in the accompanying drawings.

ln the drawings forming al part of this specification, V

Figure 1 shows one type of my improved construction.

Fig. 2 shows another type of my improved construction.

Fig. 3 shows a type of my improved construction provided with a valve casing and unloader when used on the upper part of the compressor.

Fig. 4 shows a valve easing and unloader.

Fig. 5 is a cross section of the valve casing on the line A-A of Fig. 3.

Fig. is a cross section of the valve casing on the line B-B of Fig. 3, `and Fig. v7 is a longitudinal section of the valve casing and valves.

Referring tov Fig. 1 oi the drawing, my improved inlet valve casing and unloader is shown in the position it occupies when the compressor is being operated under load. As shown in this figure. vthe valve casing comprises a hollow tubular shell 1 having ports or' openings 2 over which leaves 3 are fitted t0 make a tight joint. Each leatr 3 is fastened separately to the valve casing 1 preferably by means of screws 4 extending through the valve easing 1.. the leaf 3 and a backing plate 5. Extending from the valve casing 1 is a piston 6 which maylhe further modification of my or Separately as shown in Figsf 2 and 4. The piston 6 is operated -forwardly and backwardly in a cylinder 7 which is secured in position on the wall of the intake passage 8. With the intake passages arranged in the lower portion oi the compressor cylinder 12, as shown in Fig. 1 and when there is no pressure supplied in the cylinder 7 below the.piston 6 through pipe 9, the piston '6 falls of its own weight to the lower portion of this cylinder .7 and thus the valve-casing lowered from its sea-t 10 opening a free pas# sage from the intake passage 11 to the cylinder of the compressor 12 and thus preventing any compression of the Huid'. Any suitable means (not shown) may he used to control the admission of iiuid under pressure to the pipe 9 and cylinder 7. Should it be desired to operate the compressor under full load continuously, as, for instance, when a constant pressureis not desired, a screw 13 y may be threaded through the head ot cylinder 7 so that the valve casing 1 may be heid permanently to its seat. 10, as shown in Fig. 2. Preferably, ,a lockl nut 14 is provided to secure the screw 13 in place.

In Fig. 3 a slight modification is shown in which the valve casing is arranged for a compressor in which the intake passages `are in the upper portion of the compressor. In this ease `when the Huid under pressure supplied to the cylinder 15 by the regulator through the pipe 16 is reduced, as, for instance. when the pressure in the receiver has heen brought up tor the pressure desired, a spring 17 which is placed in the cylinder 15 on the valve side of piston 18 expands to litt the valve 19 from its seat '20. This form of valve casing may also be provided with a. screw 2l threaded through. the head of the cylinder 15 to hold the valve casing 19 to its seat .when it is desired to operate the compresso continuously under loaded condition.

The modification shown in Fig. 4 is pro-` hole 24 drilled into the upper end ot pistonl 25 and is covered and retained in place by a. plate 26 set into the upper end of the piston 25 and closely surrounding the screw 2Q. Then the compressor is operated with the 'screw 22 in the positloashewn 1n Fxg.

l i'ality nii l umd.

tlie piston 25 and oonsequently the valve naming;s EN Wiii Foe heid firmly in the position .shown lay pressure supplied tothe cylindei"V 2d in the .rear oi the piston 25 through. 'the niedinniof tlie reguiatorl pipe 29. If,

inoinded vWithin the spirit and'soope there-v oi?, expressed in the appended claims.

n'ilifliat I Claim is:

I.; lin'` an unloadei for eompressois, in eoinbination, a valve easing carrying a plni'aiity' of vaives, a seat for said. valve oasing, a piston .mounted on said .valve easing, and means for holdingsaid Valve easing against its seat,

fa In an nnloades: foi' veoinplessors in eoniljiination, Valve4 easing eamf'ying a plurality-ot "Valves,A aseat foi said valve oas* ing, Aa piston mounted on said Valve easing and means oontioiied loy inid pi'essuieffoi noli'linpg said valve easing against its seat.

In an nnloadei' for eoinpiessois, in einnliiination, ayaive easing" oairyingva plugi' valves, aA seat mounted on the oonipressoaaoi -saidjvalve easing, a' piston noot ed on said -valve easing' and means for .lioloine' said valve easinnn aainst its seat.

L 11: C9 i la. In an. ui'iioade.' 'for compressors, in. combination, a valve easing carrying a pini'aiity oi' Ieai Vanves, a seat mounted on the compressor for said valve casing, a piston mounted on sald valve easlng and means controlled by Huid pressure for holding said 45 valve easing against itsxseat.

'5. In an unloader for compressors, in Combination, a valve easing carrying a valve, a seat for said 4valve easing, a piston mounted on said Valve easing and means for holdfo ing said `Valve easing against its seat and also away from its seat. i y

6. In an unloader for compressors, l'in combination, a valve easing, said vaive easing' being adapted to seat against a eoln- 55 -pi'essor cylinder and Huid operated means to retain said Valve casing against .said oompresser cylinder and positively acting means to hold said valve easing from its seat.

7. In a eo1np1esso1',in combination, a oyl- 60 indei', an intake passage, a valvev easing mounted in said intake passage and seating against said cylinder, fluid operated. means holding said Valve easing against its seat and means to Withdraw said valve easing`v from its seat.

8.l In a compressor', in Combination, a Cylinder, an inta-ke passage, a Valve easing can iyingfa plurality ofA valves mounted in said intake passage, and seating against said cyl- 70 indeig means' holding said valve easing against its seat and means to Withdraw said oValve casing 'from its seat. A

9. In 'a compressor, in combination, a cylinder, an intake paage, a valve easing 75 HARRY "v. HAIGHT.

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