Exhaust device having deflection plates

Abstract

An exhaust device having deflection plates comprises a cabinet that is provided with a space therein. An opening is formed in front of the cabinet. The air-extraction hood located at the top of the cabinet is provided at the bottom thereof with an elongate air-extraction slot facing downwards and parallel to the rear plate. A left deflection plate is vertically located in the space in a manner of being relatively oblique to the left lateral plate while a right deflection plate is vertically located in the space in a manner of being relatively oblique to the right lateral plate. Thereby, the air drawn towards the elongate air-extraction slot can flow into the cabinet via the left and the right deflection plates so as to prevent the leakage of pollutants from the opening in front of the cabinet.

1 . An exhaust device having deflection plates, comprising:
 a cabinet, having an air-extraction hood, a bottom plate, a left lateral plate, a right lateral plate, and a rear plate, all of which define a space, where an opening is provided in front of the cabinet; an air-extraction part is provided at a bottom of the air-extraction hood; the air-extraction part has an elongate air-extraction slot facing downwards; the elongate air-extraction slot is parallel to the rear plate; and the air-extraction part is connected with an air-extraction machine for drawing air upwards;   a left deflection plate, vertically located in the space in a manner of being relatively oblique to the left lateral plate, so as to form a first included angle between the left deflection plate and the left lateral plate; and   a right deflection plate, symmetrical to the left deflection plate and vertically located in the space in a manner of being relatively oblique to the right lateral plate, so as to form a second included angle between the right deflection plate and the right lateral plate.   
     
     
         2 . The exhaust device having deflection plates as claimed in  claim 1 , wherein a front end of the bottom of the air-extraction hood is provided with a curved first guiding part while a top of the front end of the bottom plate is provided with a curved second guiding part. 
     
     
         3 . The exhaust device having deflection plates as claimed in  claim 1 , wherein a front plate is further provided in front of the cabinet and the opening is formed below the front plate. 
     
     
         4 . The exhaust device having deflection plates as claimed in  claim 3 , wherein an elongate air blow device is provided at the bottom of the front plate for blowing air downwards. 
     
     
         5 . The exhaust device having deflection plates as claimed in  claim 1 , wherein an elongate air blow part is provided in front of the bottom plate; the elongate air blow part has an elongate air blow slot with an opening facing upwards; a first air-supply space is formed between the left end of the elongate air blow part and the left lateral plate; a second air-supply space is formed between the right end of the elongate air blow part and the right lateral plate; and the elongate air blow slot is parallel to the elongate air-extraction slot so as to form a nearly two-dimensional oblique air curtain between the elongate air-extraction part and the elongate air blow part during the air-extraction machine is in operation. 
     
     
         6 . The exhaust device having deflection plates as claimed in  claim 1 , wherein a curved first guiding plate is provided at the front end of the left lateral plate the cabinet and a curved second guiding plate is provided at the front end of the right lateral plate of the cabinet for guiding airflow into the space. 
     
     
         7 . The exhaust device having deflection plates as claimed in  claim 1 , wherein a front end of the left deflection plate is in a position closely against a right lateral surface of the left lateral plate; a front end of the right deflection plate is in a position closely against a left lateral surface of the right lateral plate; and the first and the second included angles face towards the rear plate. 
     
     
         8 . The exhaust device having deflection plates as claimed in  claim 7 , wherein a front end of the bottom of the air-extraction hood is provided with a curved first guiding part while a top of the front end of the bottom plate is provided with a curved second guiding part. 
     
     
         9 . The exhaust device having deflection plates as claimed in  claim 7 , wherein a front plate is further provided in front of the cabinet and the opening is formed below the front plate. 
     
     
         10 . The exhaust device having deflection plates as claimed in  claim 9 , wherein an elongate air blow device is provided at the bottom of the front plate for blowing air downwards. 
     
     
         11 . The exhaust device having deflection plates as claimed in  claim 7 , wherein an elongate air blow part is provided in front of the bottom plate; the elongate air blow part has an elongate air blow slot with an opening facing upwards; a first air-supply space is formed between the left end of the elongate air blow part and the left lateral plate; a second air-supply space is formed between the right end of the elongate air blow part and the right lateral plate; and the elongate air blow slot is parallel to the elongate air-extraction slot so as to form a nearly two-dimensional oblique air curtain between the elongate air-extraction part and the elongate air blow part during the air-extraction machine is in operation. 
     
     
         12 . The exhaust device having deflection plates as claimed in  claim 7 , wherein a curved first guiding plate is provided at the front end of the left lateral plate the cabinet and a curved second guiding plate is provided at the front end of the right lateral plate of the cabinet for guiding airflow into the space. 
     
     
         13 . An exhaust device having deflection plates, comprising:
 a cabinet, having an air-extraction hood, a bottom plate, a left lateral plate, and a right lateral plate, all of which define a space, where an opening is respectively provided in front of and in back of the cabinet; an air-extraction part is provided at the bottom of the air-extraction hood; the air-extraction part has an elongate air-extraction slot facing downwards; the elongate air-extraction slot is perpendicular to the left and right lateral plates; and the air-extraction part is connected with an air-extraction machine for drawing air upwards;   a front and a rear left deflection plates, respectively vertically located in the space in a manner of being relatively oblique to the left lateral plate, so as to form a first included angle between the front and the rear left deflection plates and the left lateral plate; and   a front and a rear right deflection plates, where the front right deflection plate is symmetrical to the front left deflection plate and the rear right deflection plate is symmetrical to the rear left deflection plate; and the front and the rear right deflection plates are respectively vertically located in the space in a manner of being relatively oblique to the right lateral plate, so as to form a second included angle between the front and the rear right deflection plates and the right lateral plate.