Air pump for aquariums

Abstract

An air pump for aquariums to reduce noise and shrink the casing includes at least one air pump assembly in the casing. The air pump assembly has an air delivery duct communicating with a muffling chamber located on an outer bottom side of the base of the casing. Air discharged by the air pump assembly passes through a circuitous path in the muffling chamber. Thus noise can be reduced. The casing also can be shrunk to a smaller size.

1 . An air pump for an aquarium comprising a casing and at least one air pump assembly located in the casing, wherein: 
 the casing includes: 
 a upper cap which has a hollow housing chamber; and  
 a base which is coupled with the upper cap to form the casing, and has an inner side to install the air pump assembly, at least one opening and a muffling chamber located on an outer bottom side, the muffling chamber having a hollow chamber formed by indenting the outer bottom side and covered by a bottom lid, and having a plurality of partitions to divide the chamber into a plurality of small air compartments, the neighboring air compartments communicating with each other through vents to form at least one circuitous path for airflow which is discharged through an air discharge duct.  
   
   
   
       2 . The air pump of  claim 1 , wherein the air pump assembly includes at least one air inlet and at least one air delivery duct which runs through a plug and anchored in the opening of the base.  
   
   
       3 . The air pump of  claim 1 , wherein the upper cap has an inner wall which has a plurality of fastening struts located therein, each of the fastening struts having an internal screw thread.  
   
   
       4 . The air pump of  claim 1 , wherein the upper cap has at least one cavity dock to install at least one adjusting knob.