Vacuum Pump

Abstract

A vacuum pump comprises an actuator with an actuating shaft; a mounting base with a first side being attached to the actuator; a pumping device having a pump ring being attached to a second side of the mounting base opposite to the first side; and a sound-proof cap being attached to an end face of the pump ring and the pumping device being driven by the actuating shaft penetrating through the mounting base.

1 . A vacuum pump, comprising:
 an actuator having an actuating shaft;   a mounting base having a first side being attached to the actuator;   a pumping device having a pump ring being attached to a second side of the mounting base opposite to the first side; and   a sound-proof cap being attached to an end face of the pump ring and the pumping device being driven by the actuating shaft passing through the mounting base, wherein   the end face of the pump ring in the pumping device is covered by a first base plate with a hollow dampening member interposed between an inner surface of the sound-proof cap and a side of the first base plate facing thereto, dividing a space encircled therein into an inner dampening chamber and an outer dampening chamber communicating with each other,   the mounting base is formed with an air-intake column for drawing air into the pumping device, the pump ring is formed with an air discharge port, and the inner dampening chamber is in communication with the pumping device whereas the outer dampening chamber is in communication with the air discharge port.   
     
     
         2 . The vacuum pump according to  claim 1 , wherein the hollow dampening member is a hollow cylinder formed with a first opening for providing communication between the inner dampening chamber and the outer dampening chamber. 
     
     
         3 . The vacuum pump according to  claim 1 , wherein the inner dampening chamber has a volume smaller than that of the outer dampening chamber. 
     
     
         4 . The vacuum pump according to  claim 1 , wherein the actuator is an electromotor or an engine. 
     
     
         5 . The vacuum pump according to  claim 2 , wherein the sound-proof cap includes a circular flange axially extending from the inner surface of the sound-proof cap with the hollow dampening member being hitched over the circular flange, and wherein the hollow dampening member has a length longer than that of the circular flange. 
     
     
         6 . The vacuum pump according to  claim 5 , wherein a stage is configured on the bottom of the circular flange with the hollow dampening member being pressed tightly thereupon, and wherein the first opening is configured as a groove formed in the stage. 
     
     
         7 . The vacuum pump according to  claim 1 , wherein the air discharge port is configured on a circumferential surface of the pump ring which is in communication with the outer dampening chamber. 
     
     
         8 . The vacuum pump according to  claim 1 , wherein the pumping device further comprises:
 a second base plate placed against the second side of the mounting base; and   a pump rotor having a plurality of vanes contained within a hollow chamber of the pump ring.   
     
     
         9 . The vacuum pump according to  claim 8 , wherein a first via-hole is formed on the first base plate for providing communication between the hollow chamber of the pump ring and the inner dampening chamber. 
     
     
         10 . The vacuum pump according to  claim 9 , wherein the second base plate is formed with a second via-hole to be in communication with the air-intake column. 
     
     
         11 . The vacuum pump according to  claim 10 , wherein a first seal ring is positioned between the air-intake column and the second via-hole. 
     
     
         12 . The vacuum pump according to  claim 11 , further comprising a first set of fastening screws for attaching the first base plate, the pump ring and the second base plate to the mounting base; and
 a second set of fastening screws for attaching the sound-proof cap to the pump ring.   
     
     
         13 . The vacuum pump according to  claim 12 , wherein a second seal ring is disposed between the mounting base and the pump ring, and wherein a third seal ring is disposed between the sound-proof cap and the pump ring. 
     
     
         14 . The vacuum pump according to  claim 13 , wherein the actuating shaft is connected to the pump rotor via a connecting member which is a spindle sleeve formed with a key to be mated with a keyway formed on the pump rotor.