US1873974A

US1873974A - Rotary compressor impeller

Info

Publication number: US1873974A
Application number: US367650A
Authority: US
Inventors: Meyer Adolf
Original assignee: BBC Brown Boveri France SA
Current assignee: BBC Brown Boveri AG Germany; BBC Brown Boveri France SA
Priority date: 1928-06-04
Filing date: 1929-06-01
Publication date: 1932-08-30
Anticipated expiration: 1949-08-30

Description

Aug. 30 1932.

A. MEYER 1,873,974

' ROTARY COMPRESSOR IMPELLER Filed June 1. 1929 Fig.2.

Inventor Adolf Meyer i is to provide an impeller Fatented Au so, 'iesz UNETE' TAE'ES israera ADOLF MEYER, 0F K'USNACHT, NEAR ZURICH, SWITZERLAND, ASSIGNOR TO AKTIESF- GESELLSCHAFT BROWN BOVERI & 0113., OF BADEN,

COMPANY OF SWITZERLAND SWITZERLAND, A JOINT-STOCK ROTARY COMPRESSOR IMIPELLER Application filed June 1, 1929,

This invention relates to improvements in centrifugal blowers, exhausters, compressors and the like, and, more particularly, to improvements in the construction of the impellers or wheels used therein.

A centrifugal blower, exhauster or comressor in general consists of a plurality of fluid propelling or impelling wheels keyed to a shaft, the shaft and wheels rotating within a casing to which are connected various appropriate control devices. The design and construction of the impeller wheels is determined by the speed at which the wheels must be rotated to obtain the desired quantity and pressure of the fluid to be delivered. Heretofore such wheels were constructed either from a number of integral forgings riveted together or the several portions of the wheels were formed from several members which were either welded or riveted to obtain the necessary unitary construction of each wheel. It has been found that the stresses created by the-centrifugal forces inherent in even the most perfectly balanced rotating wheels are of such magnitude as to require substantially more massive constructions than are desirable from either the view point of constructional or of operating economy.

Such centrifugal action machines as blowers, exhausters, and compressors are inherently high speed machines and it is therefore desirable that the rotating masses be kept as small as possible to decrease the centrifugal forces arising at operating speeds. Reduction of weight with an increase in the factir of safety are accordingly greatly desire It is, therefore, among the objects of the present invention to provide compressing or impelling wheels for centrifugal blowers, exhausters, compressors or the like which is so constructed as to materially decrease the weight and increase the safety thereof. A further object of the present invention wheel for centrifugal blow'ers or compressors in which the construction of the wheel together with the balancing operations required in testing the same are so simplified as to materially de Serial No. 36?,650, and in Germany Iune4, 1928.

crease the cost of manufacture of such structures. 1

Another object of the invention is to provide an impeller wheel for centrifugal blowers or compressors in which the several portions of the wheel are securly reinforced against centrifugal forces arising therein.

Objects and advantages, other than those above set forth, will be apparent in the description and the drawing in which Figure 1 is a perspective view of an impeller wheel for a centrifugal blower, exhauster, compressor or the like embodying the present invention, and

Fig. 2 is a vertical cross-sectional view of Fig. 1 taken on a diameter therethrough.

Referring more particularly to the drawing by characters of reference, reference numeral 8 indicates a side disk member having a hub portion 4 centrally located therein.

The hub 4: may be formed as a separate member fixed to disk 3 but it is preferably integrally formed therewith to provide greater strength with a substantial saving of material and weight. The hub is arranged to be secured to the shaft (not shown) of a centrifu ner.

The edge of the inlet port in disk 6 is turned over to provide a construction which will have the lowest possible resistance to the flow of a fluid therethrough. Due to the centrifugal stresses arising in the impeller wheel,-it

is absolutely essential that the disk 6 be substantially reinforced about the edge of the inlet port. Such reinforcing'was heretofore accomplished by use of a massive inlet reinforcing ring which was formed either as an integral portion of disk 6 oras a separate member secured thereto. According to the present invention, an inlet disk reinforcing ring 8 is arranged within the semi-circular,

channel formed by the turned over edge of the inlet port through disk 6 in such manner that the ring is firmly retained by the disk without requiring any additional fastening means.

When a centrifugal blower or compressor is in operation, the several wheels rotate at high speed which creates centrifugal forces of great magnitude. Unless the several portions of the wheels are of suflicient size or are properly reinforced, the forces created will destroy thewheel. The wheels cannot be made of such size as to resist the centrifugal forces without reinforcement because of the massive size and weight required. When the reinforcing members are merely fastened by riveting, the tendency of the rotation is'to cause loosening or shearing of the rivets. But when the one disk of the wheel is made as an integral member and the metal of the other disk actually serves to retain its own reinforcing ring, the wheels may be almost perfectly balanced and the centrifugal forces created can be resisted by smaller masses than is otherwise possible. The amount of labor and material required in constructing each wheel may therefore be reduced-and lighter weight, and corrosion resistant materials of lower tensile strength may be used.

Although but one embodiment of the invention has been illustrated and described, it will be understood that various other embodiments are possible, and that various changes may be made without departing from the spirit of the invention or the scope of the claim.

The invention claimed is:

In an impeller wheel for centrifugal machines operating on a fluid, a disk having a ortion thereof formed as a hub, a disk havmg an aperture opposite the hub portion on said first mentioned disk, a reinforcing ring secured about the aperture through said second mentioned disk, said second mentioned disk being formed about the said ring to retain the same, and blades connecting said disks.

In testimony whereof I have hereunto subscrlbed my name this 10th day of May A. D.

ADOLF MEYER.