US2334939A

US2334939A - Valveless compressor

Info

Publication number: US2334939A
Application number: US472119A
Authority: US
Inventors: Larson Albert
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-01-12
Filing date: 1943-01-12
Publication date: 1943-11-23
Anticipated expiration: 1960-11-23

Description

Nov. 23, 1943. A. LAsow 2,334,939

VALVELESS COMPRESSOR Filed Jan. 12, 1945 INVENTOR. 41.55/27 LARSON ATTORNEY Patented Nov. 23, 1943 UNITED STATES PATENT OFFICE VALVELESS COMPRESSOR Albert Larson, Oakland, Calif., assignor to Harry Larson, Oakland, Calif.

Application January 12, 1943, Serial No. 472,119

2 Claims. (01. 230-172) This invention relates to a valveless compressor of a simple and rugged design. In many operations a supply of fluid under pressure is desired. Heretofore compressors of the usual type, that is including valves for control of inlet and outlet have been employed. These are relatively ex pensive. valveless compressors have also been suggested in the prior art but, so far as I am aware, none has been particularly successful. The valveless compressor of the present invention is particularly characterized in that it is simple to construct, of a rugged design and possesses a high operating efficiency.

It is a, general object of the present invention to provide an improved but a simple and eflicient valveless compressor.

The invention includes other objects and features of advantage, some of which, together with the foregoing will appear hereinafter wherein the present preferred form of a valveless compressor of this invention is shown and described.

In the drawing accompanying and forming a part hereof, Figure 1 is a side elevation, partly in section, of a valveless compressor of this invention.

Figure 2 is a fragmentary side elevation showing the inlet to the compressor.

In the drawing I have shown a housing generally indicated by the numeral 6. Mounted in the housing in any suitable manner is a crankshaft I which is driven by any suitable power source. An eccentric 8 mounted upon the crankshaft serves to reciprocate piston rod 9 connected to the eccentric by the follower ID. The piston rod carries the piston I2 thereon, the two being connected by pin I6 in the usual manner. The piston is reciprooated in cylinder structure I5 which is mounted upon the upper portion of the housing 6. Several piston rings I6 are preferably carried by the piston. The provision of the cylinder and piston and reciprocation of the piston in the cylinder generally form no part of this invention and any suitable construction can be employed.

In accordance with this invention, fluid inlets I I are provided in the side wall I8 of the cylinder I5. The inlets are so positioned that the piston is adjacent the bottom portion of its travel before the inlets are exposed. In this way, maximum permissible fluid admission can be secured before the piston closes off the inlet and begins its compression stroke. As the piston moves upwardly it seals off the inlets I1 and compresses the fluid confined by the cylinder and by the piston head.

To permit of release of the fluid I form a passage I9 in the cylinder sidewall, preferably oppo site to the inlet I! so that fluid trapped between the piston head and the cylinder head 2| can escape down the sidewall past the first piston ring I6 and enter inlet 22 to fluid passage 23. This passage extends down along the piston to an outlet 2 3. As the piston reaches the upper portion of its travel the outlet 24 overlaps aperture 26 in the cylinder wall I8 whereby fluid under pressure passes from between the cylinder and the piston head into aperture 25 which is connected to a fluid receiver or some means utilizing the compressed fluid.

In some cases it is desirable that fluid under pressure confined in the passage 23 be released, particularly in the case of air. To this end I form a slot 27 in the side wall so air released can scavenge the crankcase of the compressor.

In case it is desired to vary the quantity of fluid delivered by the compressor or to vary the pressure of the fluid delivered, the sidewall I8 can be tapped out adjacent to the passage I9 to permit insertion of a relatively large screw 3|. When this is moved into and out of passage I9 the volumetric efficiency of the compressor can be varied considerably whereby the pressure of the fluid delivered can be controlled. The body 3| can also be formed with a needle valve 32 thereon permitting fluid to be exhausted directly from the passage I9 through outlet port 34. This enables fluid to be bled off to vary the quantity delivered as well as the pressure of the delivered I claim:

1. A compressor comprising a cylinder having a cylinder head and a cylinder wall, a piston having a circular top and a side wall and movable in said cylinder toward and away from said cylinder head, an inlet in said cylinder wall for admitting fluid to said cylinder when said inlet is uncovered by said piston, said inlet being provided in said cylinder wall at a point whereat said inlet is exposed while said piston is substantially at the extreme of its travel away from said head, and an outlet from said cylinder comprising a first passage in said cylinder side wall extending downwardly from said head, a second passage beginning below the top of the piston and extending along the side Wall of the piston, and an outlet through said cylinder wall, said passages serving to release fluid to said outlet which has been compressed between the piston-head and cylinder.

2. A compressor as in claim 1 including a mem ber movable in said first passage to vary the volumetric efliciency of the compressor.

ALBERT LARSON.