US1943091A

US1943091A - Compressor

Info

Publication number: US1943091A
Application number: US570897A
Authority: US
Inventors: Schmidt Wilhelm Kurt
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-10-28
Filing date: 1931-10-24
Publication date: 1934-01-09
Anticipated expiration: 1951-01-09

Description

Jan. 9, 1934. w. K. SCHMIDT COMPRES SOR Filed Oct. 24, 1931 2 Sheets-Sheet l wmmm@ d /n vento/.-

Jan. 9, 1934. w. K. SCHMIDT 1,943,091

COMPRESSOR Filed Oct. 24, 1931 2 Sheets-Sheet 2 Patented Jan. 9, 1934 UNITED STATES PATENT OFFIC Application October 24, 1931, Serial No. 570,897, and in Germany October 28, 1930 1 Claim.

My invention relates to compressors for refrigerators, particularly of the kind operating with a volatile refrigerant, for instance ethyl chloride.

It is an object of my invention to provide a compressor which can readily be taken to pieces and the parts of which are not interconnected by screws or the like so that the compressor is particularly suitable for use in cases where the personnel handling it is unskilled asis the case for instance in confectioneries manufacturing icecream, cold beverages etc. Obviously in all such cases the attendant must be enabled to dismantle the compressor for cleaning and to reassemble the parts correctly Without the least possible chances of failure. This can be done only if all the parts of which the compressor is composed, and the means for fixing them in place are extremely simple in construction and simply handled.

In the drawings aflixed to this specification and forming part thereof an embodiment of my invention is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is a front elevation, partly in vertical section and with some parts broken away, of a refrigerator comprising a compressor, a pipe coil, a fan and an electromotor, the evaporator being omitted,

Fig. 2 is a plan view, partly in horizontal section, of the apparatus shown in Fig. 1,

Fig. 3 is a front elevation and Fig. 4 is a side elevation of the compressor,

' partly in vertical section, drawn to a larger scale.

Referring now to the drawings, A is the foundation plate on which the compressor B, the fan C and the electromotor D are mounted. The evaporator (not shown) is arranged below the plate A. The compressor comprises a cylinder 2, a cup-shaped cylinder cover 3 and a piston 1 designed in the usual manner. The cylinder is here formed as a plain cylindrical tube free from projections, perforations etc. and therefore easy to clean. Similarly the cylinder cover has the form of a substantially plain hemispherical cup fitting the top edge of the cylinder, while the bottom edge of the cylinder fits in a circular groove 2' of the base 7. 4 is a strap having projections 4 formed on the lower ends of its legs engaging corresponding recesses in the compressor base 7. 5 is a screw bolt passing through the curved portion of the strap 4 and through a curved plate 6, the free end of the bolt 5 resting on the cylinder cover 3 and holding same down on the top edge of the cylinder 2, at the same time forcing the bottom edge of the cylinder 2 into a groove 2 in the compressor base 7. The cover 3 and the cylinder 2 can thus be readily removed by unscrewing the bolt 5, the cover 3, cylinder 2 and base 7 being fitted together without screwing.

The refrigerant ows from the evaporator (not shown) through the bent pipe 8 (Figs. 1 and 4) into the crank case 9, through the suction valve 10 of the piston 1 into the cylinder 2 and from the latter through pressure valve 11 into the cylinder cover 3 and through the connecting pipe 13 (Fig. 3) to the coiled pipe 12 where it is cooled and condensed and is fed back to the evaporatorv through connecting pipe 22 (Fig. l). In order to prevent the vaporized refrigerant from escaping from the crank case 9, the crank shaft 15 is surrounded by a low-pressure packing (Fig. 2) comprising a stuffing box 14,

asbestos cords

16, 17 being a chamber lled with a composition of graphite, aluminium powder and glycerine.

The crank shaft 15 is driven from the motor D (Figs. 1 and 2) indirectly. The motor sheave 18 drives by means of a belt 25 a relatively large 80 intermediate sheave 19 formed as a fan. 20 is a small sheave mounted on the shaft of the intermediate sheave 19; it drives the large sheave 21 mounted on the crank shaft 15 by means of a belt 26. This drive operates free of noise and S5 permits using an inexpensive small high speed motor for driving the compressor.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modications will occur to a person skilled in the art.

A compressor comprising a crank case having its top edge formed with a cylindrical groove, a plain tubular cylinder having its bottom edge seated in said groove, a plain substantially hemispherical cover seated on the top edge of said cylinder, a piston mounted in said cylinder for axial reciprocating motion, a horse-shoe strap having its free ends anchored in said crank case and a screw bolt extending across the middle portion of said strap and bearing on said cylinder cover so as to form together with said strap the sole coupling means for said crank case, cylinder and cylinder cover.

WILHELM KURT SCHMIDT.