The ornamental design for a waterpurifier, as shown and described.
1. Water purifier
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Perspective
1.8 : Perspective
1.1 is a front elevation view of a water purifier showing our new design; 1.2 is a back elevation view thereof; 1.3 is a left side elevation view thereof; 1.4 is a right plan view thereof; 1.5 is a top plan view thereof; 1.6 is a bottom plan view thereof; 1.7 is a perspective view thereof; 1.8 is a reference view showing a usage state of the water purifier; the reproduction 1.8 is disclaimed and thus forms no part of the claimed design; the water purifier incorporating the new design is mainly used for filtration and purification treatment of water.
The broken lines in the drawings illustrate portions of the water purifier and form no part of the claimed design.