US623605A - Rotary pump - Google Patents

Description

Nn. 623,605. Patented Apr. 25, |899.

E. W. G.' C. HFFMANN.

ROTARY PUMP.

lication led Apr. 1, 1898 Unire Smarts afrnnr Ormes.

ERNST VILHELM GUSTAV CARL HOFFMANN, OF CHARLOTTENBURG, GER- MANY, ASSIGNOR TO THE SIEMENS da HALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS.

ROTARY PUP.

SPECIFICATION forming part f Letters Patent N0. 623,605, dated April 25, 1899.

Application filed Aprill, 1898. Serial No. 676,081. (No model.)

To au whom, it may concern: said shaft is rotatably mounted. Upon the Be it known that I, ERNST VILHELM GUS- eccentric h is disposed the ring or cylindrical f TAV CARL HOFFMANN, a subject of the Empump part e, within which said eccentric is r peror of Germany, residing at Oharlottenfree to rotate, the two parts forming au ecburg, Germany, have invented acertain new centric-piston f. Mounted upon the upper 55 and useful Improvement in Rotary Pumps, side of said ring is the upright g, having its (Case No. 149,) of which the following is a head rounded, which is adapted at all times full, clear, concise, and exact description. to be maintained in close engagement with i My invention relates to improvements in the left wall of the supplemental chamber xo rotary pumps, and has for its object the proc by means of a spring-like tongue 71 also 6o vision of means for securing a more efficient mounted upon the ring e and bearing against pumping or exhausting action than has been the right-hand Wall of said chamber. The attainable hitherto in pumps of this class. upright g is centrally bored to receive the It has been found in practice diflicult or Well three rods t', which loosely t within their re- I5 nigh impossible to secure any considerable s pective openings in said upright. 65 rarefaction of air or other gas when rotary It will be understood that the several movpumps were employed as exhausters, and I able pump parts mounted within the houshave accordingly devised means for obviating t quite closely the walls of their respecing this defect. The reason for the unsatistive chambers. On the upper part of said zo factory operation above alluded to is that housing is mounted the oil-cup 7e, and from 7c means have not been devised previously for supplemental chamber c oil-overilows c perinsuring in a pump of this class a packing mit the oil to pass into the wells a, disposed that is sufliciently tight or'close fitting to seupon either side of and communicating with cure the necessary rarefaction when the pump the exhaust-chamber c. The inlet or eX- is in action. hausting pipe Z opens into the chamber c be- 75 I will describe my invention as applied to neath the head of the upright g. a type of rotary eccentric pump wherein my The operation of the pump will nowbe readimproved lubricating packing is employed. ily comprehended. The parts within the eX- This type of pump may be briefly characterhaust-chamber having been previously thorized as consisting of an eccentric pump part rooughly lubricated and the wells a being par- 8o y tatably mounted upon the driving-shaft Withtially filled with oil, the rotation of the shaft 1. in the exhaust-chamber, with which chamber and eccentric in a contra-clockwise direction and pump part are associated means for insurwill serve to exhaust the air within the chaming free lubrication of the said parts,whereby ber c and through the communicating inlet Z.

ahighly-efticient exhaustingactionissecured. The surplus oil within the chamber will be 85 The above device, in connection with which pressed upward with the air into the supple- Iwi'll now explain my invention, will be more mental chamber c' and pass the spring or readily understood by reference to the accomtongue h, which readily permits the upward panyingdrawings,formingapart of thisspecipassage of the oil and air and serves as a 4o fication, whereinvalve to prevent their return. The spring or 9o Figure l is a transverse sectional view o tongue maintaining the upright in close ensaid pump, and Fig. 2 is a longitudinal secgagement with the left wall of the chamber tional view thereof. prevents the entrance of air to the left side The same letters of reference are used to of the exhaust-chamber. The surplus oil in designate like parts in both of said gures. the supplemental chamber will pass through 95 Power is supplied to the driving-shaft a, the overflows and into the wells d, from which i upon which is keyed or otherwise secured the it returns to the exhaust-chamber and maineccentric l), mount-ed within the exhaust or tains the packing between the moving parts pump chamber c. The pump housing or casand the Walls of said chamber, being forced ing d provides end bearings a a', wherein the therein through the bearings by reason of the loo vacuum produced in the said exhaust-chamber. The oil is also forced downward through the openings in the upright, the reciprocating movement of' said part serving to move up and down the rods i, which are loosely fitted in the said openings, and force the oilbetween the eccentric and its encircling ring, from whence it passes to the sides of the eccentric, thus assisting in maintaining the parts sufliciently lubricated. For convenience the oil may be supplied to the device, when desired, by means of the oil-cup 7e. The pressure of the external air, it will be seen, materially assists the passage of oil through the several communicating openings to the exhaust-chamber.

From the above it will be seen that in the normal operation of the pump the complete circulation ofthe oil will be maintained, which secures at all times for the device a very high efficiency. A very thick or heavy oil preferably is employed in the rotary pump above described, although other fluid packing or heavy lubricants may be found efficient for some applications of said pump.

Various modifications 0r departures from the device herein described may be made without departing from the spirit of my invention.

I accordingly claim as new, and desire to secure by Letters Patent, the following:

to supply oil to the pump parts, and an overiiow or return passage connected with the discharge-opening of the pump, whereby the lubricant or fluid packing is circulated and freely supplied to the relatively-moving parts, substantially as described.

2. In a rotary pump, lche combination with the exhaust-chamber c, of the eccentric-piston fmounted therein upon an actuating-shaft a, an upright g adapted to maintain the exhaustchamber closed to the external air, oil-overflow c", and a well c communicating therewith and With the exhaust-chamber, Whereby a iiuid packing or lubricant is circulated and. freely supplied to the relatively-movable pump parts, substantially as described.

3. In a pump of the class described, the combination With an exhaust-chamber c, of an eccentric-piston f mounted therein upon an actu-.

ating-shaft a, an upright g provided with rods e' loosely mounted in openings in said upright and adapted to assist in lubricating the connected piston, a valve part 7L, oil-overflows c, and lubricating-receptacles a" communieating with the said overiiows and with the exhaust-chamber, whereby a fluid packing or lubricant is circulated within the pump and freely supplied to the relatively-movable pump parts, substantially as described.

In witn ess whereof I hereunto subscribe my name this 7th day of March, A. D. 1898.

ERNST WILHELM GUSTAV CARL HOFFMANN. Vitnesses:

PAUL ROEDIGER, C. II. DAY.

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