US2540136A

US2540136A - Centrifugal blower

Info

Publication number: US2540136A
Application number: US686048A
Authority: US
Inventors: John E Oliphant
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-07-24
Filing date: 1946-07-24
Publication date: 1951-02-06
Anticipated expiration: 1968-02-06

Description

Feb. 6, 1951 J, E 0| |PHANT 2,540,136

CENTRIFUGAL BLOWER d July 24, 1946 INVENTORI JOHN E. OLIPHANT mama Feb. a, 1951 UNITED STATES PATENT- OFFICE 'i..,";';?';;I;.i.':.2.:.ft......

BOIaims. (01.230-13!) My invention relates to centrifugal blowers, and more particularly to impellers for the same, and one object is to provide an impeller whose blades are extended with chambers efiective to separate the radial air currents generated by the impeller and minimize their tendency to develop back pressure.

A- further object is to interconnect the impeller blades in a manner to form a continuous undulating wall which renders the blades extremely rigid without complicating the construction of the impeller.

Another object is to provide the impeller with a series of inter-blade chambers which face alternately on opposite sides, each chamber increasing in capacity in radial direction and promoting the passage of a greater volume of air to the zone of discharge without'a greater power requirement.

A still further object is to design the novel impeller in a manner to be cast or pressed in one piece of metal or plastic material, making its a construction simple and its manufacture economical.

With the above objects in view, and any others which may suggest themselves from the description to follow, a better understanding of the simple,'smooth-and economical to produce. Furinvention may be had by reference to the accompanying drawing, in which- Fig. 1 is a sectional view, showing the impeller installed;

' Fig. 2 is a perspective view of the impeller; and Figs. 3 and 4 are similar views of modifications. In accordance with the foregoing, specific reference to the drawing indicates a typical centrifugal blower housing at I 0, it being understood that such housings are open around the center shaft II for the entrance of air.

The improved impeller i formed as a disc If in the central region, such disc having an opening 93 to receive the shaft I i and suitable means (not shown) are employed to secure the disc I! rigidly on the shaft in a position midway between the side walls of the housing.

' The disc I! is extended radially with a series of blades l4 directed transversely of the path of impeller rotation, the form of each blade being that of an isosceles triangle with its vertex meeting the periphery of the disc II. The blades are connected on alternate sides by walls I,

creating a rotary series of chambers I which open on alternate sides of the impeller.

The construction just described facilitates the formation of the impeller by casting or pressther, the formation of the chambers separates the air currents entering into the zone of the blades so that these currents do notconfiict or overlap to create back pressure. Further, the outward deflection of the walls I! fromthe plane of the disc I! increases the capacity of the chambers it, promotingthe'passage of a greater volume of air without requiring a corresponding increase in the power to drive the impeller. Further, the chambers operate to lead the incoming air currents radially, turbulence and slippage. Finally, it is apparent that the impeller is a compact unit whose plain surface promotes the passage of air currents with a negligible friction factor.

While Fig. 1 shows the main or preferred form of the impeller, it will be apparent that the same is susceptible of minor changes or modifications. Thus, Fig. 2 shows a modification wherein the blades ll are inclined from the periphery of the disc I2, while Fig. 4 shows the blades l8 and walls is inclined and curved in s-fashion. These modifications may retain or vary the mechanical efllciency of the impeller while lending the same more attractive form. However, they do not change or depart from the principle of the invention as covered in the appended claims. I claim:

1. An impeller for centrifugal blowers comprising a. disc forming a central portion, a series of blades extending radially of the disc in planes transverse to the path of blade rotation and walls interconnecting the side edges of the blades in alternate succession, said walls inclining outwardly of said disc. V

2. An impeller for centrifugal blowers comprising a disc forming a central portion, and a series of blades extending radially of the disc in planes transverse to the path of blade rotation, the blades being of triangular form with one angle meeting the periphery of the disc, and wallsconnecting the sides of the blades in alternate succession to form chambers expanding in capacity in radial direction.

3. An impeller for centrifugal blowers comprising a disc forming a central portion of a series of blades extending radially of the disc in planes transverse to the path of blade rotation, and inclined walls interconnectingthe blades to form an undulating blade unit around the disc, said inclined walls forming three-sided chambers expanding in capacity in radial direction.

4.- The structure of claim 3, said unit being ing in one piece, making the impeller extremely integral with the disc.

opposite sides of said disc, and blades transversely 5 connected to said walls to form a rotary series of three-sided chambers. i

6. The structure of claim 5, said walls being curved in substantially S-taahion.

JOHN E. OLIPHANT. 10

REFERENCES CITED The following references are of record in the file 0! this patent:

Number Number 4 UNITED STATES PATENTS Name Date Morcur Apr. 19, 1938 Norln July 16, 1940 Sheldon June 20, 1944 FOREIGN PATENTS Country Date Switzerland Apr. 1, 1942