Convection fan

Abstract

A convection fan includes a plurality of blades mounted for rotation with a shaft, a guiding plate mounted to partially surround the plurality of blades, and a fan-motor mount. The fan-motor mount includes a top plate and a bottom plate through which the shaft extends, a motor fastener that mounts a motor to the bottom plate in isolation from the top plate, a guiding plate fastener that mounts the guiding plate to the top plate in isolation from the bottom plate, an insulator between the top plate and the bottom plate, and a plate fastener that mounts the top plate to the bottom plate. The plate fastener includes a fastener and a standoff that surrounds a portion of the fastener between the top plate and the bottom plate and within the bottom plate to provide a thermal break.

1 . A convection fan comprising:
 a plurality of blades mounted to a shaft to rotate when the shaft rotates;   a guiding plate mounted to partially surround the plurality of blades; and   a fan-motor mount comprising
 a top plate through which the shaft extends; 
 a bottom plate through which the shaft extends; 
 a motor fastener that mounts a motor to the bottom plate in isolation from the top plate; 
 a guiding plate fastener that mounts the guiding plate to the top plate in isolation from the bottom plate; 
 an insulator between the top plate and the bottom plate; and 
 a plate fastener that mounts the top plate to the bottom plate, the plate fastener comprising
 a fastener; and 
 a standoff that surrounds a portion of the fastener between the top plate and the bottom plate and within the bottom plate to provide a thermal break. 
 
   
     
     
         2 . The convection fan of  claim 1 , wherein the insulator is air. 
     
     
         3 . The convection fan of  claim 1 , wherein the insulator is formed of an insulating material. 
     
     
         4 . The convection fan of  claim 3 , wherein the insulating material is selected from the group consisting of a mica plate, an insulation fiber, a ceramic, and glass. 
     
     
         5 . The convection fan of  claim 1 , wherein the standoff includes a head and a body that extends from the head, wherein a shaft of the fastener fits within an aperture formed through the head and the body. 
     
     
         6 . The convection fan of  claim 5 , wherein the head mounts within the bottom plate. 
     
     
         7 . The convection fan of  claim 6 , wherein the fastener extends below the bottom plate. 
     
     
         8 . The convection fan of  claim 5 , wherein a head of the fastener mounts above the top plate. 
     
     
         9 . The convection fan of  claim 8 , wherein the top plate is positioned between an end of the body of the standoff opposite the head of the standoff and the head of the fastener. 
     
     
         10 . The convection fan of  claim 1 , wherein the fastener extends through the standoff. 
     
     
         11 . A convection fan assembly comprising:
 a motor;   a shaft connected to the motor, wherein the motor is configured to rotate the shaft; and   a fan comprising
 a plurality of blades mounted to the shaft to rotate when the shaft rotates; 
 a guiding plate mounted to partially surround the plurality of blades; and 
 a fan-motor mount comprising
 a top plate through which the shaft extends; 
 a bottom plate through which the shaft extends; 
 a motor fastener that mounts the motor to the bottom plate in isolation from the top plate; 
 a guiding plate fastener that mounts the guiding plate to the top plate in isolation from the bottom plate; 
 an insulator between the top plate and the bottom plate; and 
 a plate fastener that mounts the top plate to the bottom plate, the plate fastener comprising
 a fastener; and 
 a standoff that surrounds a portion of the fastener between the top plate and the bottom plate and within the bottom plate to provide a thermal break. 
 
 
   
     
     
         12 . The convection fan assembly of  claim 11 , wherein the standoff includes a head and a body that extends from the head, wherein a shaft of the fastener fits within an aperture formed through the head and the body. 
     
     
         13 . The convection fan assembly of  claim 12 , wherein the head mounts within the bottom plate. 
     
     
         14 . The convection fan assembly of  claim 13 , wherein the fastener extends below the bottom plate. 
     
     
         15 . The convection fan assembly of  claim 12 , wherein a head of the fastener mounts above the top plate. 
     
     
         16 . The convection fan assembly of  claim 15 , wherein the top plate is positioned between an end of the body of the standoff opposite the head of the standoff and the head of the fastener. 
     
     
         17 . The convection fan of assembly  claim 11 , wherein the fastener extends through the standoff. 
     
     
         18 . A convection oven comprising:
 a plurality of walls that form an enclosure;   a convection fan at least partially mounted within the enclosure, the convection fan comprising
 a motor; 
 a shaft connected to the motor, wherein the motor is configured to rotate the shaft; and 
 a fan comprising
 a plurality of blades mounted to the shaft to rotate when the shaft rotates; 
 a guiding plate mounted to partially surround the plurality of blades; and 
 a fan-motor mount comprising
 a top plate through which the shaft extends; 
 a bottom plate through which the shaft extends; 
 a motor fastener that mounts the motor to the bottom plate in isolation from the top plate; 
 a guiding plate fastener that mounts the guiding plate to the top plate in isolation from the bottom plate; 
 an insulator between the top plate and the bottom plate; and 
 a plate fastener that mounts the top plate to the bottom plate, the plate fastener comprising 
  a fastener; and 
  a standoff that surrounds a portion of the fastener between the top plate and the bottom plate and within the bottom plate to provide a thermal break; and 
 
 
 a control to control operation of the convection fan. 
   
     
     
         19 . The convection oven of  claim 18 , wherein the standoff includes a head and a body that extends from the head, wherein a shaft of the fastener fits within an aperture formed through the head and the body, wherein the head mounts within the bottom plate. 
     
     
         20 . The convection oven of  claim 18 , wherein the standoff includes a head and a body that extends from the head, wherein a shaft of the fastener fits within an aperture formed through the head and the body, wherein a head of the fastener mounts above the top plate.