Drainage device

Abstract

The present invention discloses a of drainage device comprising a drainage device main body, a filter, a seal member and a fixing member, characterized in that, several protrusions are provided in equal interval around an outer circumferential surface of the drainage device main body. The fixing member is a circular ring that corresponds in shape with the drainage device main body. An annular groove is provided along a circumference of a back side of the circular ring. Notches in number corresponding to that of the protrusions are provided in equal interval around an inner circumferential surface of the circular ring. Several locking slots each in shape of an arc and continuously arranged one by one in the same direction are provided around the inner circumferential surface of the circular ring along each of the notches. Several self-locking pins are also provided on the circular ring. The drainage device according to the present invention changes the traditional way of installing a drainage device by threaded connection; instead, it utilizes locking connection attainable by coordination between protrusions, locking slots and self-locking pins and such connection is high in reliability, simple to assemble and convenient to disassemble.

What is claimed is: 
     
         1 . A drainage device which comprises a drainage device main body, a filter, a seal member and a fixing member, characterized in that, several protrusions are provided in equal interval around an outer circumferential surface of the drainage device main body; the fixing member is a circular ring that corresponds in shape with the drainage device main body; an annular groove is provided along a circumference of a back side of the circular ring; notches in number corresponding to that of the protrusions are provided in equal interval around an inner circumferential surface of the circular ring; several locking slots each in shape of an arc and continuously arranged one by one in same direction are provided around the inner circumferential surface of the circular ring along each of the notches; several self-locking pins are also provided on the circular ring. 
     
     
         2 . The drainage device as in  claim 1 , characterized in that, each of the protrusions is in shape of a water droplet. 
     
     
         3 . The drainage device as in  claim 1 , characterized in that, the locking slots provided along each of the notches are three in number and they extend from an edge of the corresponding notch to a bottom edge of the inner circumferential surface of the circular ring and arranged in an oblique line. 
     
     
         4 . The drainage device as in any of  claims 1  to  3 , characterized in that, the protrusions and the notches are both three in number. 
     
     
         5 . The drainage device as in any of  claims 1  to  3 , characterized in that, the self-locking pins are three in number.