Integral active and passive silencer

An active acoustic silencer for silencing an acoustic wave propagating through a pipe comprising:

• an outer housing with an inlet for receiving a gas flow through said pipe and an outlet through which the gas exits the housing;
• a tube within the housing through which gas flows for at least a portion of a flow path between the inlet and the outlet of the housing, the tube having a port therein and being removable from the housing;
• an actuator for generating a canceling acoustic wave that is in acoustic communication with gas in the tube through the port in the tube;
• wherein the removable tube is supported at one end by a first collar adjacent to the outlet and at the other end by a second collar when the tube is installed.

An acoustic silencer for silencing an acoustic wave propagating through a pipe comprising:

• an outer housing with an inlet for receiving a gas flowing through a pipe and an outlet through which the gas exits the housing, the inlet being in a front portion of the housing and the outlet being in a rear portion of the housing;
• the front portion of the housing being separable from the rear portion of the housing;
• a passive silencer located in the front portion of the housing;
• an active silencer having a tube through which gas flows from the passive silencer to the outlet, a port in the tube, an actuator for generating a canceling acoustic wave, and a tuning chamber in acoustic communication with the actuator and the port in the tube;
• wherein the tube, the actuator and the tuning chamber are located in the rear portion of the housing.

An acoustic silencer for silencing an acoustic wave propagating through a pipe comprising:

• an outer housing with an inlet for receiving a gas flowing through a pipe and an outlet through which the gas exits the housing, the inlet being located in a front portion of the housing and the outlet being located in a rear portion of the housing, the front portion of the housing being separable from the rear portion of the housing;
• a passive silencer located in the front portion of the housing;
• an active silencer having an actuator for generating a canceling acoustic wave, the actuator being located in the rear portion of the housing, and an error transducer located in the rear portion of the housing downstream of the actuator, the error transducer generating an error signal;
• an electronic controller located outside of the outer housing that receives the error signal and generates a correction signal that drives the actuator;
• a socket located in the rear housing portion, an error transducer wire connecting the error transducer to the socket and an actuator wire connecting the actuator to the socket;
• and
• a socket connector electrically connected to an error signal wire that is connected to the electronic controller for transmitting the error signal, the socket connector also being electrically connected to a correction signal wire that is electrically connected to the electronic controller for transmitting the correction signal;
• wherein the socket connector can engage the socket so that the error signal can be transmitted from the error transducer to the electronic controller and the correction signal can be transmitted from the electronic controller to the actuator.