US2854928A - Air compressor or pump - Google Patents

Description

Oct. 7, 1958 J. SZCZEPANEK 2,854,928

AIR COMPRESSOR OR PUMP Original Filed April 21, 1955 f/wE/v me Jon/v 52 :2 EPHNEK y WW 75 WW United States Patent Ofiice 2,854,928 l ate'nted Oct. 7, 1958 AIR COMPRESSOR R PUMP John Szczepanek, Chicago, Ill.

Original application April 21, 1955, Serial No. 502,981,

now Patent No. 2,788,748, dated April 16, 1957. Divided and this application June 5, 1956, Serial No.

2 Claims. (Cl. 103-423) My invention relates to improvements in air compressors, pumps or similar devices.

This application is a division of my presently pending application Serial No. 502,981, filed April 21, 1955, now issued as U. S. Patent No. 2,788,748 on April 16, 1957. My invention relates more particularly to improvements in the construction of devices of this type wherein the parts are generally greatly simplified and the efficiency of the simplified construction is very high.

While the construction which will be explained and described is directed particularly to small or portable types of compressors or pumps such as are used for paint spray guns, etc., it will be understood that the invention is not so limited, and the size or capacity of the construction is not restricted to the details of construction which will be shown.

The principal object of the present invention is to provide an improved air compressor or pump construction.

A further object is to provide such construction with a minimum of moving parts, yet which will function in a highly efiicient manner for the purpose desired.

A further object of the invention is to provide a. compressor or pump of the type described that has an improved valve construction.

A further object is to provide a comparatively frictionless cooperation of rotor and valve in a construction of the type described thereby insuring long life and high efliciency.

A further object of the invention is to provide a compressor or pump of the type described that is easily and cheaply made and one which will give long and hard service without becoming broken or out of order.

Other objects and advantages will be more apparent from the following description wherein reference is had to the accompanying drawings, upon which:

Fig. 1 is a cross-sectional view of a compressor or pump construction wherein an air compressor is employed to assist in operating the valve plate;

Fig. 2 is a transverse cross-sectional View thereof taken on the line 2--2 of Fig. 1; and

Fig. 3 is a fragmentary sectional view thereof taken on the line 3-3 of Fig. 2.

In the embodiment of the invention which I have chosen to illustrate and describe, I have shown a construction wherein I provide the rotor housing 76 having a chamber 78 Within which the ofiset rotor 80 is mounted, the rotor being driven by a shaft 82 from a desired source of power.

The housing has an inlet conduit 84 connected to a suitable bore 88 which connects with the chamber 78 upon one side of a vertically disposed valve plate 12. The driving shaft 82, as best shown in Fig. 2, may be provided with thrust or end bearings 83 and 85 located in suitable cavities in side wall 69 and end plate 67 of the housing 76. The housing 76 may include an end plate 67 fastened thereto by suitable screw members and enclosing a sealing wire 63 located in suitable semicylindrical grooves 61 and 59 in the housing 76 and the end plate 67 respectively.

This construction is preferable when the housing and cover plate are made of comparatively soft aluminum, so that an effective seal will be maintained about the chamber 78 by reason of the wire sealing member embedded in its position between the two facing surfaces of these parts. As can be seen in Fig. 3, the sealing wire 63 has its ends 63a and 63b abutting the sides of the valve plate 12.

The reciprocating valve which I prefer to employ in this construction is comparatively light, being made of a linen fiber of the type of which gears and other similar parts have been made, the fibers being comparatively tough so that the wearing qualities of this material are very good. Accordingly, I provide the valve plate 12 generally rectangular in shape, having the lower arcuately shaped face 14 which rides upon the periphery of the rotor 80. The radius of the face 14 is preferably much larger than the radius of the rotor so that at all times a tangential contact at only one point is maintained. The valve plate 12 is adapted to reciprocate in a suitable passageway 16 on the valve plate housing 18, the plate having a pin member 20 extending upwardly therefrom and through a suitable opening 22 in the top wall of the valve housing. The pin is provided with a head 24 so that the valve 12 may be manually raised and lowered when desired, especially for priming or in starting the compressor or pump.

I have provided a construction wherein air pressure is utilized to force the valve plate in sealing position against the periphery of the rotor 80. This may include the outlet passageway 26 and the ball check valve 28 which normally seals the same. Check valve 28 may be aligned with a vertical passageway 30 in the valve housing 18, the passageway 30 communicating with a passageway 32 at the top of the valve housing which has a port opening into the valve passageway 16, and a spring-pressed check valve 34 closing the other end of the same. An outlet passageway 36 is aligned with the check valve 34.

In the operation of the compressor above described, as the compressor is forcing air under pressure through the passageway 30, pressure will be built up in the valve passageway 16 so that as the rotor rotates to the position shown in Fig. 1, pressure on top of the valve plate will normally tend to hold the same in frictional contact with the rotor. This action is thus obtained without the use of springs or any other direct or other connection between the valve plate and the rotor, the construction serving to function solely due to the pressure that will be built up in the passageways 30, 32 and 16 between the check valves 28 and 34. In view of the fact that there is a possibility that this pressure will diminish during rest periods of the rotor, the priming pin 20 has been provided for starting the operation of the mechanism.

While I have illustrated and described a specific embodiment of the invention, it will be apparent to those skilled in the art that changes and modifications may be made in the exact details shown, and I do notwish to be limited in any particular; rather what I desire to secure and protect by Letters Patent of the United States is:

1. The combination of a housing having a cylindrical rotor chamber therein, a cylindrically shaped rotor mounted in said chamber, a drive shaft extending therefrom, said drive shaft axially mounted in said chamber, said rotor eccentrically mounted thereon, a valve chamber above said rotor chamber, a vertically reciprocal rectangularly shaped plate valve mounted above said rotor in said valve chamber, an inlet conduit in said housing to said rotor chamber on one side of said plate,

an outlet conduit in said housing to said rotor chamber on the other side of said plate, spring pressed check valves in said outlet passageway, and a passageway in said,housingbetweensaid check. valves connecting said outlet passage with said valve chamber wherebypressure in saidv outlet passageway .forces .said valve. plate into engagement with said rotor.

2. The. combination of a housing having acylindrical rotor chamber. therein, a cylindrically shaped rotor mounted in saidchamber, said chamberhaving a removable sidewall and an integral side wall, a drive shaft extending from said rotor through an opening in said integral wall, a bearing in both said removable wall and said integral wallfor said .shaft, said housing having a circular. sealing ring generally surrounding the chamber therein andin contact with the inside of said removable wall, said drive shaft axially mounted with respect to said chambensaid rotor eccentrically mounted on said shaft, a valve chamber in said housing, a vertically reciprocal rectangularly shaped plate valve mounted in said valve chamber above said rotor said valve chamber having an opening therein above said plate valve, a priming pin connected to the top of said plate valve and extending upwardly through said opening, an inlet conduit in said housing to said rotor chamber on one side of said plate, an outlet conduit 'in said housing to said rotor chamber on the other side of said plate, spring pressed check valves in said outlet passageway, and a passageway between said check valves connecting said outlet passage with the valve plate chamber whereby pressure in said outlet passageway forces said valve plate into engagement-with said rotor.

References Cited in the file of this patent UNITED STATES PATENTS 1,890,571 Dubrovin Dec. 13, 1932 1,890,573 Dubrovin Dec. 13, 1932 1,949,710 Dubrovin Mar. 6, 1934 1,997,725 Gaede Apr. 16, 1935 2,191,172 Lisowski Feb. 20, 1940 2,340,196 Magrum et a1. Jan. 25, 1944 2,373,457 Chisholm Apr.v 10, 1945 2,706,452 Hilton Apr. 19, 1955 2,758,548 Rockwell Aug. 14, 1956 2,788,748 Szczepanek Apr. 16, 1957 FOREIGN PATENTS 1,005,203 France Dec. 12, 1951

Images