Rotary frequency-changer

• US 4,035,711 A
• Filed: 07/21/1975
• Issued: 07/12/1977
• Est. Priority Date: 07/26/1974
• Status: Expired due to Term

• Current Assignee: Hans Piller
• Original Assignee: Hans Piller
• Inventors: Piller, Hans
• Primary Examiner(s): Shoop, William M.
• Application Number:
  US05/597,647
• Time in Patent Office: 722 Days
• Field of Search: 72/448, 72/446, 100/DIG. 18, 174/16 R, 174/52 R, 174/58, 310/58, 310/62, 310/63, 310/160, 312/250, 317/100, 321/62, 321/63, 321/64, 321/8 C
• US Class Current: 363/174
• CPC Class Codes: H02K 5/24 specially adapted for suppression or reduction of noise or vibrations
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft
• CPC Class Codes: H02M 1/20 Contact mechanisms of dynamic converters

Abstract

A frequency-changer comprising an air-cooled rotary frequency converter having a shaft which carries a rotor of a fan arranged to cool the converter by forced ventilation. The converter is located in a sound-proofed housing through which forced air flow produced by the fan is passed. The housing defines above the converter a chamber through which the air is guided to flow in the opposite direction to the air flow through the converter. The chamber has an upright baffle at each end and is divided into two compartments by a wall extending through the chamber parallel with the axis of rotation of the converter. Controls for the converter are accommodated in the compartments.

Claims

1. Apparatus for producing ventilation and soundproofing for a frequency-changer, comprising a housing having a first chamber and a second chamber separated from said first chamber by an insulated wall, a rotary frequency converter mounted in said first chamber and having a rotatable shaft on which a fan rotor is mounted for rotation therewith, said fan directing a flow of air through said converter in a first direction, an air passage formed in said insulated separating wall and providing communication between the converter and second chamber wherein air directed through said converter is forced through said air passage and into said second chamber for movement therethrough in a second direction that is opposite to movement of the air through said converter in said first direction, means for controlling operation of said converter located in at least one of said compartments for exposure to the circulating air, and baffles located in said second chamber adjacent to the ends thereof and extending in a direction that is perpendicular to the longitudinal axis thereof, said baffles cooperating with the adjacent walls of said second chamber to define air passages therebetween through which the air is directed.

2. Apparatus as claimed in claim 1, a wall located in said second chamber and extending in a direction parallel to the longitudinal axis thereof and dividing said second chamber into two compartments.

3. Apparatus as claimed in claim 1 in which said second chamber includes a pair of end walls and a roof and an air exit formed in one of said end walls adjacent to a baffle, and the baffle adjacent to said one end wall extending downwardly from the roof of said housing chamber.

4. Apparatus as claimed in claim 3 in which said air exit is in an upper part of said one end wall in horizontal alignment with said downwardly-extending baffle.

5. Apparatus as claimed in claim 4 in which an air inlet is provided in said other end wall of the housing opposite said one end wall in which said air exit is located and communicating with said first chamber.

6. Apparatus as claimed in claim 5 in which said fan rotor is mounted at the end of said converter remote from said air inlet.

7. Apparatus as claimed in claim 1 in which said housing includes a supporting surface beneath said converter and in which said converter includes a plurality of supports, each support comprising a vibration damper normally arranged to rest on said supporting surface, a roller, having an axis of rotation parallel to the axis of rotation of said converter and positioned above said supporting surface when said vibration damper is engaged with said supporting surface, and a lifting device to raise and lower said vibration damper and said roller, said lifting device including a pedestal that is lowered to engage said supporting surface and then to lift said vibration damper from engagement with said supporting surface.

8. Apparatus as claimed in claim 7 including a pair of removable rails which are insertable one under each said roller when said vibration dampers have been lifted from engagement with said supporting surface, said pedestals then being raised from said supporting surface to permit said converter to be moved on said rollers along said rails.

9. Apparatus as claimed in claim 7 in which each said lifting device includes a vertically movable upright pin fitted at its lower end with said pedestal.

10. Apparatus as claimed in claim 9 in which each said pin is a screw-threaded bolt and each lifting device comprises a nut engaging the respective bolt and engageable with an underneath surface of the respective support.

11. Apparatus as claimed in claim 10 in which each said nut has a spherical end-face and in which there is a spherically recessed washer engaged by said spherical end face of said nut and engageable with the underneath surface of the respective support.

12. Apparatus as claimed in claim 9 in which each said lifting device also includes a spring acting to urge said pin in a direction to lift said pedestal thereon from said supporting surface, and a cam engaging the respective pin to move said pin axially against the force of said spring to move said pedestal into engagement with said supporting surface.

13. Apparatus as claimed in claim 9 in which each said lifting device also includes a toggle mechanism extendible through its dead-centre position to raise and lower said respective pin to disengage and engage the pedestal thereon with said supporting surface, said lifting device also including a stop that is engageable by said toggle mechanism after said toggle mechanism has been moved through the dead-centre position in the direction to lower said pedestal to hold said pedestal in engagement with said supporting surface.