Claims
- 1. Apparatus comprising spaced relatively high-speed moving components with a seal between the components, the one component being a rotor and the other a stator, and the seal being attached to the rotor, the seal being of material of low coefficient of friction, ability to cold flow, and a hardness less than that of the component against which it moves, and being formed under conditions at a temperature above normal operational temperature whereby, under the conditions of starting relative movement between the components, a sufficient space exists between the two components for foreign matter expulsion from between the components, and under normal non-starting operating conditions the seal configuration is changed and includes a lip projecting from the rotor towards the stator thereby to enhance sealing between the rotor and stator components to establish a reduced substantially minimal clearance between the relatively adjacent moving components and thereby create an effective seal for normal operation of the components.
- 2. Apparatus as claimed in claim 1 wherein the rotor and stator constitute components of a siren, and the seal is mounted in ports in the rotor adapted to move into and out of alignment with ports in the stator, thereby to permit egress of air during alignment, and to permit entrapment of air during non-alignment, the seal minimizing leakage between the rotor and stator.
- 3. Apparatus as claimed in claim 2 wherein the coefficient of thermal expansion of the seal being greater than that of the components thereby to permit egress of foreign matter from the contact area between the rotor and stator prior to reaching operational speed.
- 4. Apparatus as claimed in anyone of claims 1, 2 or 3 wherein the seal material is a fluorocarbon.
- 5. Apparatus as claimed in claim 4 wherein the seal extends about the port, such ports being of substantially rectangular cross-section.
- 6. Apparatus as claimed in claim 5 including vanes located circumferentially to each side of the stator port, thereby to define a plenum adjacent to each stator port, the rotor ports opening and closing the plenum through alignment and disalignment between the rotor ports and stator ports.
- 7. Apparatus comprising spaced relatively high-speed moving rotor and stator components of a siren with a seal between the stator and rotor, the seal being of material of low coefficient of friction and ability to cold flow, and a hardness less than that of the component against which it moves, and being formed under conditions at a temperature above normal operational temperatures whereby, under the conditions of starting relative movement between the components, a space exists between the two components for foreign matter expulsion from between the components, and under normal non-starting operating conditions the seal configuration is changed and includes a lip attached to and projecting from the rotor thereby to establish a reduced substantially minimal clearance between the relatively adjacent rotor and stator moving components and thereby create an effective seal for normal operation of the components, the seal being mounted about ports in the rotor adapted to move into and out of alignment with ports in the stator, thereby to permit egress of air during alignment and to permit entrapment of air during non-alignment, the seal minimizing leakage between the rotor and stator, and the number of stator ports to rotor ports being in a 2:1 ratio such that the stator ports are closed at relatively different times.
- 8. Apparatus as claimed in claim 7 including stationary vanes to define a plenum in substantial alignment with each stator port, and the stator and rotor ports are substantially rectangular in cross-section.
- 9. Apparatus as claimed in claim 7 or 8 wherein the rotor ports are substantially square in cross-section and the stator ports are substantially slot shaped.
Parent Case Info
This is a division of application Ser. No. 480,851, filed Mar. 31, 1985.
US Referenced Citations (14)
Foreign Referenced Citations (2)
Number |
Date |
Country |
679749 |
Aug 1939 |
DEX |
1268525 |
May 1968 |
DEX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
480851 |
Mar 1985 |
|