Rotary blower with isothermal air jacket

Abstract

A rotary blower with an isothermal air jacket having multiple interconnected and synchronized parallel multi-lobe rotors with the same number of lobes for propelling flow from a suction port to a discharge port of an inner casing without internal compression. The isothermal air jacket is shaped to surround the blower outer body, but is oversized to provide adequate flow spaces with outer skin of the blower to enable an effective cooling of the outlet casing and an effective heating of the inlet casing so that the whole casing temperature will tend to be more uniform and isothermal, resulting in a blower with less vibration, lower noise and longer blower life.

1 . A rotary blower with an isothermal air jacket apparatus, comprising:
 a. a housing structure having a flow suction port and a flow discharge port and internal flow passage there-between, and a flow passage enclosing the main casing;   b. two parallel multi-lobe rotors having the same number of lobes and rotatably mounted on two parallel rotor shafts respectively inside said inner casing and interconnected through a set of timing gears to rotate in synchronization for propelling flow from said suction port to said discharge port;   c. an isothermal air jacket apparatus comprising a fan mounted on rotor own shaft and a flow passage for circulating cooling air over the outer surfaces of said main casing;   d. whereby said rotary blower is capable of delivering the desired pressure with lower vibration, noise and less leakage than conventional rotary blowers, so that they can operate more reliably, efficiently and has a longer life.   
   
   
       2 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said rotors are of twisted shape. 
   
   
       3 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder has a feedback channels for noise reduction. 
   
   
       4 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said rotors have interlobe profile seals and end seals. 
   
   
       5 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder has induction channels near said outlet port. 
   
   
       6 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder has an outer noise abatement jacket for noise reduction. 
   
   
       7 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder is made of material of aluminum or copper alloy with high heat conductivity. 
   
   
       8 . A rotary blower with an isothermal air jacket apparatus, comprising:
 a. a housing structure having a flow suction port and a flow discharge port and internal flow passage there-between, and a flow passage enclosing the main casing;   b. two parallel multi-lobe rotors having the same number of lobes and rotatably mounted on two parallel rotor shafts respectively inside said inner casing and interconnected through a set of timing gears to rotate in synchronization for propelling flow from said suction port to said discharge port;   c. an isothermal air jacket apparatus comprising a cooling fan mounted on rotor own shaft and a flow passage for circulating cooling air from said outlet port to said inlet port;   d. whereby said rotary blower is capable of delivering the desired pressure with lower vibration, noise and less leakage than conventional rotary blowers, so that they can operate more reliably, efficiently and has a longer life.   
   
   
       9 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 8 , wherein said rotors are of twisted shape. 
   
   
       10 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 8 , wherein said cylinder has a feedback channels for noise reduction. 
   
   
       11 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 8 , wherein said rotors have interlobe profile seals and end seals. 
   
   
       12 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 8 , wherein said cylinder has induction channels near said outlet port. 
   
   
       13 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 8 , wherein said cylinder has an outer noise abatement jacket for noise reduction. 
   
   
       14 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 8 , wherein said cylinder is made of material of aluminum or copper alloy with high heat conductivity. 
   
   
       15 . A rotary blower with an isothermal air jacket apparatus, comprising:
 a. a housing structure having a flow suction port and a flow discharge port and internal flow passage there-between, and a flow passage enclosing the main casing;   b. two parallel multi-lobe rotors having the same number of lobes and rotatably mounted on two parallel rotor shafts respectively inside said inner casing and interconnected through a set of timing gears to rotate in synchronization for propelling flow from said suction port to said discharge port;   c. an isothermal air jacket apparatus comprising a fan mounted on rotor own shaft and a flow passage for circulating cooling air from said inlet port to said outlet port;   d. whereby said rotary blower is capable of delivering the desired pressure with lower vibration, noise and less leakage than conventional rotary blowers, so that they can operate more reliably, efficiently and has a longer life.   
   
   
       16 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said rotors are of twisted shape. 
   
   
       17 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder has a feedback channels for noise reduction. 
   
   
       18 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said rotors have interlobe profile seals and end seals. 
   
   
       19 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder has induction channels near said outlet port. 
   
   
       20 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder has an outer noise abatement jacket for noise reduction. 
   
   
       21 . A rotary blower with isothermal air jacket apparatus as claimed in  claim 1 , wherein said cylinder is made of material of aluminum or copper alloy with high heat conductivity.