Claims
- 1. A radial flow fan comprising:
- fan wheel means which includes a plurality of fan blades and is rotatable about a fan wheel axis,
- drive motor means arranged coaxially with respect to the fan wheel means for imparting rotational movement to said fan wheel means, at least part of said drive motor means being arranged within the fan wheel means intermediate the outer periphery of the fan wheel means and the fan wheel axis, said drive motor means including a stator and a rotor,
- fan casing means including circumferentially extending casing wall means which extend circumferentially around said fan wheel means at a spacing therefrom, and casing end wall means at each of the respective opposite axial end faces of said circumferentially extending wall means,
- outlet port means provided in said circumferentially extending wall means for accommodating discharge of gas out of said casing means in a radial direction with respect to the axis of rotation of the fan wheel means,
- and inlet port means in a first of said end wall means for accommodating flow of gas into said casing means in communication with said fan blades,
- wherein said drive motor includes a centrally disposed rotor shaft which rotates about said fan wheel axis, and wherein a contact disc is provided at one end of said rotor shaft for axially supporting said rotor shaft,
- wherein said one end of said rotor shaft is rounded and smoothly polished for contacting a correspondingly smoothly polished contact surface of said contact disc,
- wherein said contact disc is supported directly at the second end wall means,
- wherein said contact disc includes a central portion engageable with said rotor shaft and peripheral leg portions for maintaining the side of said central portion facing away from said rotor shaft at a spacing from said second end wall means, whereby shock forces from said rotor shaft are resiliently absorbed by resilient deformation of said central portion in a direction toward said second end wall means and
- wherein said contact disc further includes a projection for limiting the resilient deformation of said central portion which extends from said central portion toward said second end wall means.
- 2. A fan according to claim 1, wherein said contact disc further includes a radially extending outer annular sealing edge portion which extends continuously around the circumference of said contact disc and which is spaced radially outwardly of axially adjacent outer surface portions of said contact disc.
- 3. A fan according to claim 2, further comprising means for deforming said annular edge portion upon clamping of said contact disc into position against a bearing sleeve for said rotor shaft such that contact disc central portion is stressed oppositely to the stress thereof when said rotor shaft is forced toward said second wall means, whereby sagging of said central portion due to the weight of the rotor transferred by said rotor shaft is prevented.
- 4. A fan according to claim 3, wherein said means for deforming include screw means connecting said second end wall means to a flange of said bearing sleeve with said annular edge portions engaging at said second end wall means and at said bearing sleeve at a position spaced axially of said second end wall means.
- 5. A fan according to claim 4, wherein said contact disc consists of a solid film lubricant.
- 6. A fan according to claim 5, wherein said contact disk is of one-piece homogeneous constructions.
- 7. A fan according to claim 3, wherein said annular edge portion is disposed closer to said second end wall means than is the central portion when in the assembled condition.
- 8. A fan according to claim 7, wherein said annular edge portion further forms an axial stop abutment for said contact disc during assembly.
- 9. A fan according to claim 8, wherein said means for deforming include screw means connecting said second end wall means to a flange of said bearing sleeve with said annular edge portions engaging at said second end wall means and at said bearing sleeve at a position spaced axially of said second end wall means.
- 10. A fan according to claim 8, wherein said contact disk is of one-piece homogeneous construction.
- 11. A fan according to claim 10, wherein said contact disc consists of a solid film lubricant.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2257509 |
Nov 1972 |
DEX |
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Parent Case Info
This is a division of application Ser. No. 418,213 filed Nov. 23, 1973 and now U.S. Pat. No. 3,961,864.
US Referenced Citations (13)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1538876 |
Mar 1970 |
DEX |
439569 |
Dec 1967 |
CHX |
Divisions (1)
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Number |
Date |
Country |
Parent |
418213 |
Nov 1973 |
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