US1693323A - Compressor - Google Patents

Description

- 30 same assignee as the present application.

Patented Nov. 27, 1928.

warren STATES A 1,693,323 PATENT ol-"FIcE.

CHRISTIAN STEENSTRUP, OF SCHENECTAD'Y. NEW YORKQASSIGNOR TO GENERAL ELEC- TRIO COMPANY, A. CORPORATION OF NEW YORK.

COMPRESSOR.

Application filed April 27.

My invention relates to compressors of the piston and cylinder type and particularly to compressors adapted for compressing the refrigerant in domestic refrigerating machines. An object of my invention isthe pro vision of a compressor having an improved construction which among other desirable characteristics shall be efficient, quiet in operation, and easily manufactured.

My invention will .be better understood from the following description taken in connection with the accompanying drawing, and its scope will be pointed out in the appended claims.

Referring to the drawing, Fig. 1 shows in cross section a compressor involving my invention; Fig. 2 is a section approximately on the line 2-2 of Fig. 1, and Fig. 3 shows a detail of the compressor drawn to a larger w scale.

While the compressor involving my invention is not limited to any particular use, I have constructed itand also illustrated it herein as a part ofan'electric refrigerating machine of the type especially adapted for domestic use, such being shown for example in my copending application, Serial No. 166,212, filed Feb. 5, 1927 and assigned to the A com ressor insucha machine need have but smal capacity, nevertheless it must be efiicient to insure economical operation, must run quietly and must be simple to manufacture. These requirements I have successfully attained in the construction now to be described.

In Fig. 1, the frame 1 has journalled therein the vertical shaft 2 to the upper end of which is secured the rotor 3 of the driving motor and at the lower end of which is formed the wrist'pin 4. The oscillating cyliuder 6 has trunnions 7 and 8 by which it is pivotally mounted respectively in the frame 1 and bottom plate 9. Hollow piston 10 has the bearing 11 for the wrist pin 4 whereby the piston is reciprocated and the cylinder is osciliated. Inlet passage 13 communicates when the cylinder is in proper. angular position with the intake port 14 located near the end of the cylinder bore. The exhaust valve comps the disk 16 which engages the end of the der as a seat and from which it is'adapto be lifted bodily when the compressed gas is discharged into the space 17 sit) 1927. Serial No. 187.069.

from which it escapes through passages not shown. For quiet operation at high speed the valve disk 16 should be light in weight, therefore thin. For the valve to be tight the disk must also have a seat engaging portion which is flat to such a degree that it makes continuous contact with the seat and should not be deflected by the differences in pressures which may exist on opposite sides there of. I have found that a construction which meets these conditions in avery satisfactory manner and which may be easily manufactured comprises a metal disk having a substantially flat outer portion for engaging the bowed body portion. Lapping or other fin- I ishing of such a valve disk toobtain uniform contact around the valve seat I have found to be unnecessary. By having the body of the valve disk concavo-convex, preferably arranged with the convex face inwardly, the disk is better able to withstand without deflection the relatively large pressure diiferences which obtain on opposite sides thereof during the suction stroke. In order to preserve a very small clearance with such a valve I make the end face 18 of the piston 10 concave with substantially the same curva- 90 y ture as the body of the valve disk.

The end of the cylinder 6 with the valve disk 16 is covered by the end head 20 which is constructed to constitute a mufiler. Being preferably s uare in shape it is shown secured 5 to the cylin er at the corners by screws. 21. Small openings 22 in the-sides allow the escape of the compressed gas into the space 17 in the frame, and the gas is discharged from this chamber in two successive stages under the control of ports 27 formed in' the inside of the cylindrical wall of the casing 1 and valve faces 28 on the body of the compressor cylinder 6 between which expansion pockets 29 are formed. Such an arrangement of expension pockets is more fully described and claimed in my application, Serial No. 278,589, filed May 17 1928. 5 For resiliently holding the valve disk on the seat and for cushioning the outward 11o movement thereof, I have provided a thin normally flat disk 24 preferably of spring steel between the valve disk and the mufller 20. Spring disk 24 is given an initial tension when the parts are assembled by causing the disk to be slightly deflected by engagement movement of the valve disk under the restraint of the central portion of the spring disk for the escape of the compressed gas. After the valve disk has moved a predetermined distance,however, further movement is met by the additional resistance effected by the peripheral portion of the spring disk engaging the muffler. Continued outward movement of the valve disk now is opposed by a greater force than before for the spring disk is required to bend on the short radius represented by the radial dis,- tance between its periphery and its point of contact with .the valve disk. This cushioning effect of the spring disk tends to bring the valve disk to rest quickly and noiselessly; the valve disk nevertheless is returned to its seat under the force of a relatively light spring which also tends toward quiet operation. At the center of the muffler I have shown a small opening 26 to assist in equalizing the pressure on the two sides of the spring disk.

What I claim as new and desire to secure by Letters Patent of the'United States, is

1. A compressor comprising a cylinder, a

piston therein, an exhaust valve for the cylinder comprising a thin rigid disk seating against the end of the cylinder, said disk havresilient disk between said end head and said rigid disk.

2. A compressor comprising a cylinder, 9.

disk at spaced points. and when deflected a predetermined amount by said valve disk to engage the end head at another point spaced from said first mentioned points.

' 3; A compressor comprising a cylinder, a

piston therein, an exhaust valve disk seating against the end of the cylinder, an end head for the cylinder and means for yieldingly opposing and cushioning outward movement of the valve disk comprising a resilient disk arranged normally to engage the valve disk and an end head respectively at portions adjacent its periphery and its center and when deflected a predetermined amount to engage the end head also at its periphery.

4. A compressor comprising a cylinder, a piston therein, a rigid valve disk having an inwardly concaved body portionand an outer substantially fiat portion seating against the end of the cylinder, a muffler covering the end of the cylinder having a central inward projec- 'tion thereon, and a disk spring engaging said projection at its central portion and said valve disk at its outer portion, said disk spring being adapted to engage said m ufiier at its periphery when deflected a amount by the valve disk.

5. In a refrigerating machine a compressor comprising an oscillatably mounted cylinder, a piston therein, a muffler secured to the end of the cylinder having a plurality of small discharge openings in its sidewalls, a rigid valve disk having a concavo-co'nvex body portion and a substantially flat edge portion engaging the end of the cylinder and a spring disk between the valve disk and the mufiler.

In witness whereof, I have hereunto set mv hand this 26th day of April, 1927.

oHmsTIAN srnnnsrnnr predetermined CERTIFICATE OF CORRECTION.

Patent No. L693, 323. Granted November 27, 1928, to

CHRISTIAN STEENSTRUP.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 43, claim 1, for the word "fixed" read "flexedf; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case inthe Patent Office.

Signed and sealed this 8th day of January, A. D. 1929.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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