US280600A - gaeeisotf - Google Patents

Description

(No Model.)

W. P. 01010310010. VACUUM PUMP.

No. 280,000. Patented Jul 3, 1883..

N. PETERS. Pnclnimu n her. Wnhinglnn, D.C

7 eiency of the pump.

it UNITED STATES PATENT OFFICE.

WILLIAM-F. GARR'ISON, OF BROOKLYN, NEWV YORK, ASSIGNOR TO GUILD & GARRISON, OF SAME PLACE.

VACUUM-PUMP.

SPECIFICATION forming part of Letters Patent No. 280,600, dated July 3, 1883.

Application filed January 31,1883.

To all whom it may concern:

Be it known that I, WILLIAM F. GARRISON, of the city of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Vacuum-Pumps, of which the following is a specification.

In vacuum-pumps it is of great importance that all the air contained in the pump-cylinder and passages should be discharged at each stroke of the piston, as any air remaining in the cylinder or passages at the commencement of the return-stroke would expand, and such air would be compressed and expanded at each stroke of the piston without being discharged, thereby greatly impairing the effi- Such vacuum pumps are usually worked with a quantity of water in the air-cylinder sufficient to nearly or quite fill the passages when the piston is at the end of its stroke.

My invention relates to vacuum pumps the axis of the cylinder; and Fig. 2 representsa longitudinal section on the plane of the dotted line a: 00, Fig. 1.

Similar letters of reference designate corresponding parts in both the figures.

A designates the cylinder of a vacuum; pump, wherein a piston, A, is to be reciprocated ,by a steam-cylinder or other suitable means, and which is provided with heads A A.

B designates a water and air chest, here represented as arranged above the cylinder and divided by a transverse partition, B, into two compartments, which communicate with the two ends of the cylinder by ports or passages a in the cylinder.

0 designates the suction-valve chest, and D (No model.)

designates a discharge-valve chest, which are separated from each other by a partition, 0. The suction-valve chest 0 is separated from the water and air chest B by a partition, 0 and the discharge-valve chest D is separated from said water and air chest by a partition, D. The suction and discharge valve chests O D are closed by a cover, E, from which extends the discharge air-pipe E, while E designates the opening through which the suc tion-pipe (not here shown) communicates with the suctionvalve chest 0. The partition C contains the seats for the downwardlyopening suction-valves F, and the said valves are accessible through hand-holes B in the water and air chest B. The partition 'D contains the seats for the upwardly-opening dischargevalves F. The valves may be of any suitable kind. The water and air chest B, the suction and discharge valve chests O D, and the partitions O, O", and D are all shown as formed integral in one casting, and this is a great advantage, as then the cover E forms the only joint in the chest, and this joint is way above both the suction and discharge valves. The partition D, wherein are the discharge-valves F, is not horizontal, but is inclined from its junction with the partition 0" upward and outward nearly to the cover E. This construction is advantageous for many reasons. It enables me to reduce the size of the water and air chest for a given number of dischargevalves, or to get in a greater valve area in a chest of a given size. The shock of the water striking on the partition or valve-seat D at the discharge is greatly reduced below what it would be if the partition or valve-seat were horizontal. The suction valves F can be brought lower down, so that they will be covered with water earlier in the stroke, and the partitions C D are brought down so near to the cylinder that there is no need of extending a bar across the ports a, as is usually done, and consequently I get a large port extending around half the circumference of the cylinder, as shown in Fig. 1. Such large ports are very advantageous, as the water is moved withless disturbance and its velocity is not greatly accelerated in passing through the ports. The

suctioirvalves are brought so low down that the suction-pipe maybe secured to the side of the suction-valve chest C, and the height of the whole structure can be reduced.

Obviously the partition D, instead of being inclined from the inner side of the chest D upward and outward, might be inclined from the outer side of said chest at a point just above the suction-valves upward and inward to the top of the partition 0.

I am aware of Letters Patent N 0. 224,179, granted February 8, 1880, to \Villiam H. Guild, Jr., for improvements in vacuum-pumps, and I do not claim anything which is shown therein as of my invention. My construction is different from that shown in the patent. I form my cylinder, divided water and air chest, suction and discharge chests, partitions separating the suction and discharge chests from each other and from the water and air chests, the latter partitions separating the suction and discharge chests from the water and air chest containing the seats for the suction and discharge valves, all in one and the same integral structure, and employ a simple cover or bonnet for closing the suction and discharge chests. This construction enables me to bring the only joint in the valve chests above both the suction and discharge valves. In the aforesaid patent 'the suction and discharge chests are formed in a separate structure from the cylinder, which is secured to the structure containing the cylinder by a joint which is on a level with the dischargevalves, and both the suction and discharge pipes must be removed it it is desired to open or remove the suction and discharge chests. In my construction the cover of the suction and discharge chests may be removed and access aiiordcd to the chests by simply removing the discharge-pipe and without disconnecting the suction-pipe, which bolted to the suction-chest below the joint of the cover.

What I claim as my invention, and desire to secure by Letters Patent, is

l. The combination of the air-cylinder A,

the divided water and air chest 13, communicating with the ends of the cylinder, the partition 0, containing the seats for downwardlyopening inlet-valves, and the partition 1), containing the seats for upwardly-opening outletvalves, having an inclination above the said partition C substantially as and for the pun pose herein described.

2. The combination of the air-cylinder A, the dividedwater and air chest B, co1n1nunieating with the ends of the cylinder, the suc tion and discharge chests C D, separated from each other by the partition 0 and from. the chest B by the partitions C D, which contain the valve-seats, all said parts being formed in one integral structure, and the removable cover for the suction and discharge chests, the joint of the cover being entirely above the valves, substantially as described.

3. The combination of the water and air chest B, the suction and discharge valve chests U and l), the inclined partition I), separating the chests l3 and I) and containing discharge valves, and the partition 0, separating the chests l3 and C and containing suction-valves, all substantially as herein described.

XVM. l1. G-ARR'ISON.

\Vitnesses:

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