Exhausting device

Abstract

An exhaust device comprises an air-extraction hood and a left upright plate and a right upright plate that are respectively placed below two lateral sides of the air-extraction hood, where a first guiding part is provided at the front end of the right lateral surface of the left upright plate and a left top plate is provided between the first guiding plate and an air-extraction slot; a second guiding part is provided at the front end of the left lateral surface of the right upright plate and a right top plate is provided between the second guiding plate and the air-extraction slot; and the right top plate and the left top plate are symmetrically arranged at two sides of the bottom of the air-extraction hood. The leakage of pollutants can be prevented by means of the cooperation of the air-extraction slot and an air-blowing slot.

What is claimed is: 
     
         1 . An exhausting device, comprising an air-extraction hood, a left upright plate and a right upright plate, where a bottom of the air-extraction hood is provided with at least one air-extraction slot and the air-extraction slot is connected to an air-extraction device for drawing air upwards; the left upright plate and the right upright plate are respectively placed below a left side and a right side of the air-extraction hood; and a space is formed between the air-extraction hood, the left upright plate and the right upright plate; wherein a side or a surface of the air-extraction hood, the left upright plate, and the right upright plate that is approaching towards a user is defined as a front end, while a side or a surface of the air-extraction hood, the left upright plate, and the right upright plate that is away from the user in an opposite direction is defined as a rear end; and two sides of the air-extraction hood, the left upright plate, and the right upright plate are respectively defined as a left side and a right side when the user faces the air-extraction hood, the left upright plate, and the right upright plate; the exhausting device characterized in that:
 an elongate and upright first guiding part is provided at a front end of a right lateral surface of the left upright plate, a left top plate is provided between the first guiding part and the air-extraction slot, and the left top plate has a top side upwardly adjacent to a left side of a bottom of the air-extraction hood and has a left side leftwardly adjacent to the right lateral surface of the left upright plate;   an elongate and upright second guiding part is provided at a front end of a left lateral surface of the right upright plate, a right top plate is provided between the second guiding part and the air-extraction slot, and the right top plate has a top side upwardly adjacent to a right side of the bottom of the air-extraction hood and has a right side rightwardly adjacent to the left lateral surface of the right upright plate; and   a left air blow groove and a right air blow groove are provided on the bottom of the air-extraction hood and are respectively in elongate shape for blowing air downwardly, where the left air blow groove and the right air blow groove are aligned with and are spaced from each other; the left air blow groove is parallel to the top side of the left top plate and located at a rear end of the top side of the left top plate; and the right air blow groove is parallel to the top side of the right top plate and located at a rear end of the top side of the right top plate.   
     
     
         2 . The exhausting device as claimed in  claim 1 , further comprising a first upright plate and a second upright plate, wherein the first upright plate is bended and extended leftwardly from the front end of the left upright plate, and the second upright plate is bended and extended rightwardly from the front end of the right upright plate. 
     
     
         3 . The exhausting device as claimed in  claim 1 , wherein the left top plate and the right top plate are symmetrical to each other, and the left top plate has one end that extends rightwardly while not exceeds the air-extraction slot's left edge, and the right top plate has one end that extends leftwardly while not exceeds the air-extraction slot's right edge. 
     
     
         4 . The exhausting device as claimed in  claim 1 , wherein the left top plate is an inverted triangle plate. 
     
     
         5 . The exhausting device as claimed in  claim 1 , wherein the right top plate is an inverted triangle plate. 
     
     
         6 . The exhausting device as claimed in  claim 1 , wherein the air-extraction slot is in elongate shape, and the left air blow groove and the right air blow groove are parallel to the air-extraction slot. 
     
     
         7 . The exhausting device as claimed in  claim 1 , further comprising a rear plate, wherein the rear plate has a left end and a right end that are respectively connected with rear ends of the left upright plate and the right upright plate.