Furnace

Abstract

A furnace includes: a furnace housing defining a combustion chamber therein and having a top end section that is provided with an emergent stack which defines a gas-releasing channel in fluid communication with said combustion chamber; and a safety valve mounted in the gas-releasing channel and including a shaft that is secured to the emergent stack, and opposite first and second covering plates that are pivoted to the shaft so as to be rotatable relative to the shaft for closing and opening the gas-releasing channel.

1 . A furnace comprising:
 a furnace housing defining a combustion chamber therein and having a top end section that is provided with an emergent stack which defines a gas-releasing channel in fluid communication with said combustion chamber; and   a safety valve mounted in said gas-releasing channel and including a shaft that is secured to said emergent stack, and opposite first and second covering plates that are pivoted to said shaft so as to be rotatable relative to said shaft for closing and opening said gas-releasing channel.   
   
   
       2 . The furnace of  claim 1 , further comprising a pair of positioning studs secured to said emergent stack and protruding into said gas-releasing channel for supporting and retaining said first and second covering plates at a closed position, where said first and second covering plates close said gas-releasing channel. 
   
   
       3 . The furnace of  claim 2 , wherein each of said first and second covering plates is substantially semi-circular in shape, said gas-releasing channel having a circular cross-section, said first and second covering plates substantially overlapping said circular cross-section of said gas-releasing channel when said first and second covering plates are disposed at the closed position. 
   
   
       4 . The furnace of  claim 3 , wherein said supporting studs are diametrically disposed relative to said gas-releasing channel. 
   
   
       5 . The furnace of  claim 4 , further comprising a pair of stopping studs secured to said emergent stack, protruding into said gas-releasing channel, and disposed above said supporting studs, said first and second covering plates abutting against said stopping studs, respectively, when said first and second covering plates are disposed at an opened position, where said first and second covering plates diverge from said shaft and are formed into a V shape. 
   
   
       6 . The furnace of  claim 1 , further comprising at least one first C-shaped plate and at least one second C-shaped plate, each of said first and second C-shaped plates having a sleeve portion that is sleeved rotatably on said shaft, and two opposite end portions that are secured to a respective one of said first and second covering plates.