US758801A - Condensing air-pump. - Google Patents

Description

PATENTBD MAY 3, 1904.

J. WILHELMI.

CONDENSING AIR PUMP.

APPLICATION TILED MAY 2. 1903.

H0 MODEL.

me Non. runs u.. wommv.; warum n i Patented May 3, 1904.

JOHANNES WVILHELMI, OF HAMBURG, GERMANY.

CONDENSING AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. r758,801, dated May 3, 1904.

Application filed May 2, 1903- Serial No. 155,432. (No model.)

Beit known that l, J ouANNns lVILnELMI, a resident of Hamburg, in the German Empire, have invented certain new and useful 1mprovements in Condensation Air-Pumps, of which the following is a specification.

The present invention relates to improvements in condensation air-pumps.

ln surface condensation it is advantageous to suck water and air from the condenser separately.

lV ith this end in View my invention consists in combining in a puip an air-piston presenting a large cross-section and a water-plunger piston presenting a small cross-section, both pistons being operated by one single pistonrod and arranged in such a manner that the space which is formed in the large cylinder between the large and the small piston causes by its vacuum action a compensation or balance of work between the two halves of a double stroke (up and down stroke) and acts as a butler on the termination of the downstroke.

1n order that my invention may be more fully understood by one skilled in the art to which it appertains, l shall now proceed to describe the same in det-ail, reference being taken for that'purpose to the accompanying' sheet of drawing', whereon I have shown a central vertical section of a condensation air-pump constructed in accordance with and embodying my invention.

The improved pump is provided with an aircylinder' ,'whieh is in communication with the air-inlet by means of openings c and an annularychannel (l, surrounding the latter, and with the air-outlet c by means of suitable pressure-valves f, provided in the cylinder cover or top wall g, and of a chamber or casing' It, mounted at the top of the pump and surrounding the said pressure-valves. At the lower part of the pump or cylinder (t there is arranged a water-c vlinder 1', which is in communication, by means of openings/il and a chamber surrounding' the said openings, with the water-inlet m, and by means of a channel n and a suitable pressure-valve o with the wateroutlet p. The air-inlet I) and the water-inlet ynf are suitably connected to the condenser.

The cylinder (l contains a piston q and the cylinder f' a piston fr, preferably a plunger-piston. Both pistons are attached to and operated by a single piston-rods. 1n order to construct a pump of this kind of small dimensions, the air-piston and the cylinder end walls g and tare made conical in form and the waterpiston and water-cylinder arranged in the hollow of the conical piston z] and conical bottom wall t, respectively, as clearly shown in the drawing.

By means of the described arrangement of the condensation air-pump an almost uniform efliciency is obtained. During the upstroke the air above the piston q, which air opposes a comparatively small resistance, is expelled through the valvesf, chamber lr., and outlet c against atmospheric pressure, whereas fresh air is sucked into the space underneath the piston q from the condenser through the openings e. At the end of the upstroke of the piston q the same vacuum will exist in the cylinder a as in the condenser. As the piston Ir moves simultaneously with the piston r] a vacuum is produced at the same time in the water-cylinder J. lV hen at the end of the upstroke of the pistons q and r the bottom of the piston r has cleared the openings f, water will rush in from the condenser through the inlet m, chamber I, and openings 1 and fill up the water-cylinder a'. During the subsequent downstroke of the pistons q and ll' the openings are immediately closed by the down movement of the piston fr, and the water below the piston r, which water opposes a comparatively great resistance, is forced out through the channel n, pressure-valve a, and outlet p, a vacuum being produced at the same time in the air-cylinder ay above the piston l] by the down movement of this piston. Upon the termination of the downstroke the lower part of vthe air-cylinder is completely closed by the piston q sliding over the openings c, and the air contained in the said lower part compressed, so that an extreme-ly advantageous cushioning effect for compensating or absorbing the action of the weight of the moving parts is obtained. After the piston (1 on its downstroke has` passed the openings c the vacuum above the piston q causes the air to rush from the condenser through the cleared openings c into the air-cylinder, from where it will be expelled by the next or following upstrole of the air-piston.

By the described combination of two pistons of different sizes the following results are attained: Almost all the air is exhausted by the sucking action of the large piston and little or no air enters the small water-cylinder, and, secondly, a vacuum is formed or produced on each stroke in the air-cylinder which demands an expenditure of energy on the upstroke of the piston which is, however, recuperated on the downstrole.

In the example shown the pistons operate with pressure-valves only, the suction-valves being replaced by the openings c and and the slide action of the pistons themselves. The pump may, however, `also be provided with suction-valves, if desired. Then the pump is provided with suction-valves, the conical chamber Z serves as suction air-chamber.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. A pump having a water-cylinder and an air-cylinder larger than the water-cylinder,

Y pistons therein, a piston-rod connected to both pistons and means to produce an air-cushion at the termination of the downstroke, whereby the space between the large and small pistons in the air-cylinder causes by its vacuum action a compensation or balance of work between the two halves of a double stroke (up and down stroke), substantially as described.

2. A pump having a water-cylinder and a concentric air-cylinder, each having inletports,.concentric pistons in said cylinders, a piston-rod operating both of the pistons, the ports. in the air-cylinder closed before the end of the air-piston stroke to form an air-cushion and admit air into the partial vacuum above the piston, and the ports in the Water-cylinder opened at the end of the suction-stroke of the water-pistons to admit water to the partial vacuum formed in the water-cylinder, substantially as described.

3. A pump having a water-cylinder provided with peripheral ports at one end and a concentric air-cylinder provided with peripheral ports at its opposite end, concentric pistons in said cylinders to control the ports and a piston-rod connected to both of the pistons, substantially as described.

4. A pump having a water-cylinder provided with peripheral ports, a concentric aircylinder also provided with peripheral ports, a conical piston in the air-cylinder and a piston in the water-cylinder each controlling the respective ports, and a piston-rod connected to both of the pistons, substantially as described.

5. A pump having a water-cylinder provided with peripheral ports, a concentric aircylinder having peripheral ports and conical ends, a piston in each of said cylinders controlling the respective ports and an annular conical chamber surrounding the water-cylinder and communicating therewith through the ports in said cylinder, substantially as described.

6. A pump having a Water-cylinder provided with peripheral ports at its upper end and having its lower end opening into a valvecontrolled discharge-channel, a larger concentric air-cylinder having conical ends and peripheral ports near its lower end, an air-chamber surrounding the upper end of said cylinder, valves to'control the exhaust of Vair from the cylinder to the chamber, a conical piston in the air-cylinder, a cylindrical piston in the water-cylinder, each controlling admission through their respective ports and a conical chamber surrounding the water-cylinder and communicating therewith through the ports rin said cylinder, substantially as described.

JOHANNES WILHELMI.

Witnesses:

E. H. L. MUMMENHOFF, OTTO W. HELLMRICH.

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