Range hood

Abstract

A range hood includes a housing, a cover, an exhaust pipe and at least two vacuum fans. The housing has a top and bottom openings opposite to each other. The cover is disposed in the housing and adjacent to the bottom opening. The cover has an air inlet facing the bottom opening. The exhaust pipe is disposed in the housing and located between the top opening and the cover. The exhaust pipe has an air outlet adjacent to the top opening and communicates with the cover. The vacuum fans are disposed in the cover and located between the air inlet and the exhaust pipe. Each vacuum fan has an air flow inlet adjacent to the air inlet and an air flow outlet adjacent to the air outlet. An area of the air inlet is greater than or equal to an area of the air flow inlets.

What is claimed is: 
     
         1 . A range hood, comprising:
 a housing, having a top opening and a bottom opening opposite to each other;   a cover, disposed in the housing and adjacent to the bottom opening of the housing, wherein the cover has an air inlet facing the bottom opening;   an exhaust pipe, disposed in the housing and located between the top opening of the housing and the cover, wherein the exhaust pipe has an air outlet adjacent to the top opening, and the exhaust pipe and the cover communicate with each other; and   at least two vacuum fans, disposed in the cover and located between the air inlet and the exhaust pipe, wherein each of the at least two vacuum fans has an air flow inlet adjacent to the air inlet and an air flow outlet adjacent to the exhaust pipe, and an area of the air inlet of the cover is greater than or equal to an area of the air flow inlets of the at least two vacuum fans.   
     
     
         2 . The range hood according to  claim 1 , further comprising at least one baffle disposed between the at least two vacuum fans and the bottom opening of the housing, wherein the least one baffle is inclined with respect to a plane formed by the air inlet of the cover so as to form an angle with respect to the plane. 
     
     
         3 . The range hood according to  claim 2 , wherein the angle between the at least one baffle and the plane is greater than or equal to 0.1 degrees and less than or equal to 10 degrees. 
     
     
         4 . The range hood according to  claim 2 , wherein the cover further has an inner wall surface, an edge of the inner wall surface surrounds to form the air inlet of the cover, and a gap is formed between the at least one baffle and the edge of the inner wall surface of the cover. 
     
     
         5 . The range hood according to  claim 2 , wherein an area of the air inlet of the cover is A, an area of the air flow inlets of the at least two vacuum fans is B, an area of the baffle is C, and A−C≥B. 
     
     
         6 . The range hood according to  claim 2 , wherein a number of the at least one baffle is plural, the at least one baffle comprises a first baffle and a second baffle, the at least two vacuum fans comprise a first vacuum fan and a second vacuum fan, the first baffle is located between the first vacuum fan and the bottom opening of the housing, and the second baffle is located between the second vacuum fan and the bottom opening of the housing. 
     
     
         7 . The range hood according to  claim 6 , wherein a first projection area of the first baffle on the plane and a second projection area of the second baffle on the plane do not overlap each other. 
     
     
         8 . The range hood according to  claim 6 , wherein a gap is formed between the first baffle and the second baffle, and the gap is greater than or equal to 2 cm and less than or equal to 10 cm. 
     
     
         9 . The range hood according to  claim 6 , wherein an area of the air inlet of the cover is A′, an area of the air flow inlet of the first vacuum fan is B 1 , an area of the air flow inlet of the second vacuum fan is B 2 , an area of the first baffle is C 1 , an area of the second baffle is C 2 , and A′−(C 1 +C 2 )≥B 1 +B 2 . 
     
     
         10 . The range hood according to  claim 2 , wherein a number of the at least one baffle is plural, the at least one baffle comprises a first baffle, a second baffle and a third baffle, wherein the first baffle, the second baffle and the third baffle are disposed adjacent to one another, wherein a first projection area of the first baffle on the plane, a second projection area of the second baffle on the plane and a third projection area of the third baffle on the plane do not overlap each other. 
     
     
         11 . The range hood according to  claim 2 , wherein a number of the at least one baffle is plural, the at least one baffle comprises a first baffle, a second baffle, a third baffle and a fourth baffle, wherein the first baffle, the second baffle, the third baffle and the fourth baffle are arranged as an array, wherein a first projection area of the first baffle on the plane, a second projection area of the second baffle on the plane, a third projection area of the third baffle on the plane and a fourth projection area of the fourth baffle on the plane do not overlap each other. 
     
     
         12 . The range hood according to  claim 1 , wherein the at least two vacuum fans comprise a first vacuum fan and a second vacuum fan, the exhaust pipe comprises a first sub pipe and a second sub pipe, the first sub pipe has a first extending portion, the second sub pipe has a second extending portion, the first extending portion communicates with the air flow outlet of the first vacuum fan, the second extending portion communicates with the air flow outlet of the second vacuum fan, a cross-sectional area of the first extending portion is less than or equal to an area of the air flow inlet of the first vacuum fan, and a cross-sectional area of the second extending portion is less than or equal to an area of the air flow inlet of the second vacuum fan. 
     
     
         13 . The range hood according to  claim 12 , wherein the first sub pipe has a first joining portion connected with the first extending portion, the second sub pipe has a second joining portion connected with the second extending portion, the first joining portion is connected with the second joining portion, the first joining portion has a first opening adjacent to the air outlet, the second joining portion has a second opening adjacent to the air outlet, and the first opening, the second opening and the air outlet communicate with each other. 
     
     
         14 . The range hood according to  claim 13 , wherein the first extending portion extends from the first vacuum fan toward the first joining portion so as to have a first extending length, the second extending portion extends from the second vacuum fan toward the second joining portion so as to have a second extending length, and the first extending length and the second extending length respectively are greater than or equal to 20 cm and less than or equal to 60 cm. 
     
     
         15 . The range hood according to  claim 13 , wherein an area of the air outlet is D, an area of the first opening of the first joining portion is D 1 , an area of the second opening of the second joining portion is D 2 , and D 1 +D 2 ≥D. 
     
     
         16 . The range hood according to  claim 13 , wherein an angle is formed between an end of the first extending portion and an end of the second extending portion, and the angle is an acute angle. 
     
     
         17 . The range hood according to  claim 1 , further comprising at least one blower fan disposed between the housing and the cover, wherein the blower fan has a gas outlet adjacent to the bottom opening of the housing and a gas inlet away from the bottom opening of the housing. 
     
     
         18 . The range hood according to  claim 17 , wherein an air volume outputted from the gas outlet of the blower fan within a time period is less than an air volume inputted from the air flow inlet of the vacuum fan within the time period. 
     
     
         19 . The range hood according to  claim 17 , wherein the housing further has a plurality of side edges, the side edges surround to form the bottom opening, the blower fan is disposed on one of the side edges, the gas outlet of the blower fan extends along one of the side edges so as to have an extending length, and the extending length is greater than or equal to 70% and less than 100% of a length of one of the side edges. 
     
     
         20 . The range hood according to  claim 19 , wherein the side edges comprise a first side edge, a second side edge, a third side edge and a fourth side edge, the first side edge is opposite to the second side edge, the third side edge is opposite to the fourth side edge, the third side is adjacent to the first side edge and the second side edge, the fourth side edge is adjacent to the first side edge and the second side edge, a number of the at least one blower fan is plural, the at least one blower fan comprises a first blower fan, a second blower fan and a third blower fan, the first blower fan is disposed on the first side edge, the second blower fan is disposed on the second side edge, and the third blower fan is disposed on the third side edge.