Rotary blower with noise abatement jacket enclosure

Abstract

A rotary blower with noise abatement jacket enclosure 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 noise abatement jacket enclosure is shaped to surround the blower and to conform generally to its body contours, but is oversized to provide adequate cooling spaces with outer skin of the blower. It comprises a forced air cooling jacket comprising an inner and outer cover, a sound absorbent layer comprising an inner and outer surface, the inner surface in contact with the blower outer cooling cover, and a sound barrier layer comprising an inner surface in contact with the outer surface of the sound absorbent layer.

1 . A rotary blower with noise abatement jacket enclosure, comprising:
 a. a housing structure having a flow suction port and a flow discharge port and internal flow passage there-between, and an inner enclosed casing and an outer cover with a hollow space there-between;   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. a cooling layer comprising said space between outer cover and said inner casing and at least one cooling fan mounted on one of said two rotor shafts for circulating cooling air through said layer;   d. a sound absorbent layer comprising an inner and outer surface, said inner surface in contact with said outer surface of said cooling layer;   e. and a sound barrier layer comprising an inner surface in contact with said outer surface of said sound absorbent layer;   f. whereby said high rotary blower is capable of achieving a high damping and reduction of noise emitted from said blower surfaces while being kept light in mass and small in size, and at the same time enhancing the heat transfer from said blower outer surfaces, so that said blower operates more quietly, reliably and be used for mobile applications.   
   
   
       2 . The noise abatement jacket enclosure of  claim 1 , wherein said cooling layer has a centrifugal cooling fan mounted on one of said two rotor shafts for circulating cooling air through said layer. 
   
   
       3 . The noise abatement jacket enclosure of  claim 1 , wherein said sound absorbent layer is comprised of a material selected from the group consisting of expandable Urethane foam. 
   
   
       4 . The noise abatement jacket enclosure of  claim 1 , wherein said sound barrier layer is comprised of hard materials such as metal or plastic. 
   
   
       5 . A rotary blower with noise abatement jacket enclosure, comprising:
 a. a housing structure having a flow suction port and a flow discharge port and internal flow passage there-between;   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. a sound absorbent layer comprising an inner and outer surface, said inner surface in contact with said outer surface of said blower housing;   d. and a sound barrier layer comprising an inner surface in contact with said outer surface of said sound absorbent layer;   e. whereby said high rotary blower is capable of achieving a high damping and reduction of noise emitted from said blower surfaces while being kept light in mass and small in size, and at the same time enhancing the heat transfer from said blower outer surfaces, so that said blower operates more quietly, reliably and be used for mobile applications.   
   
   
       6 . The noise abatement jacket enclosure of  claim 5 , wherein said sound absorbent layer is comprised of a material selected from the group consisting of expandable Urethane foam. 
   
   
       7 . The noise abatement jacket enclosure of  claim 5 , wherein said sound barrier layer is comprised of hard materials such as metal or plastic. 
   
   
       8 . A rotary blower with noise abatement jacket enclosure, comprising:
 a. a housing structure having a flow suction port and a flow discharge port and internal flow passage there-between, and an inner enclosed casing and an outer cover with a hollow space there-between leading to a manifold with injection ports towards rotor near discharge port;   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. a cooling layer comprising said hollow space between said outer cover and said inner casing and at least one cooling fan on each side mounted on one of said two rotor shafts for circulating cooling air through said layer;   d. a sound absorbent layer comprising an inner and outer surface, said inner surface in contact with said outer surface of said cooling layer;   e. and a sound barrier layer comprising an inner surface in contact with said outer surface of said sound absorbent layer;   f. whereby said high rotary blower is capable of achieving a high damping and reduction of noise emitted from said blower surfaces while being kept light in mass and small in size, and at the same time enhancing the heat transfer from said blower outer surfaces, so that said blower operates more quietly, reliably and be used for mobile applications.   
   
   
       9 . The noise abatement jacket enclosure of  claim 9 , wherein said cooling layer has a centrifugal cooling fan mounted at each side on one of said two rotor shafts for circulating cooling air through said layer. 
   
   
       10 . The noise abatement jacket enclosure of  claim 9 , wherein said sound absorbent layer is comprised of a material selected from the group consisting of expandable Urethane foam. 
   
   
       11 . The noise abatement jacket enclosure of  claim 9 , wherein said sound barrier layer is comprised of hard materials such as metal or plastic.