Gas water heater

Abstract

A gas water heater includes a bottom housing having an opening, a burner mounted at the bottom housing, and a cover plate assembly mounted at the bottom housing and covering the opening. The cover plate assembly includes a first cover plate and a second cover plate. The second cover plate is located between the burner and the first cover plate. The cover plate assembly has an air inlet channel located between the first cover plate and the second cover plate. The first cover plate has a first flow inlet in communication with the air inlet channel. The second cover plate has a second flow inlet distant from the first flow inlet, and in communication with the air inlet channel and an air inlet of the burner.

What is claimed is: 
     
         1 . A gas water heater comprising:
 a bottom housing having an opening;   a burner mounted at the bottom housing; and   a cover plate assembly mounted at the bottom housing and covering the opening;   wherein:
 the cover plate assembly includes a first cover plate and a second cover plate, the second cover plate being located between the burner and the first cover plate; 
 the cover plate assembly has an air inlet channel located between the first cover plate and the second cover plate; 
 the first cover plate has a first flow inlet in communication with the air inlet channel; and 
 the second cover plate has a second flow inlet distant from the first flow inlet, and in communication with the air inlet channel and an air inlet of the burner. 
   
     
     
         2 . The gas water heater according to  claim 1 , wherein the second flow inlet includes a first through hole group and a second through hole group, the first through hole group being disposed at a position close to a primary air inlet of the burner, and the second through hole group being disposed at a position adjacent to a secondary air inlet of the burner. 
     
     
         3 . The gas water heater according to  claim 2 , wherein a flow cross-sectional area A1 of the first through hole group and a flow cross-sectional area A2 of the second through hole group satisfy 1≤A1/A2≤2. 
     
     
         4 . The gas water heater according to  claim 1 , wherein a flow cross-sectional area P1 of the first flow inlet and a flow cross-sectional area P2 of the second flow inlet satisfy 1.5≤P2/P1≤3. 
     
     
         5 . The gas water heater according to  claim 1 , wherein:
 the burner is mounted in a lower region of the bottom housing;   the second flow inlet is located in a lower region of the second cover plate; and   the first flow inlet is located in an upper region of the first cover plate.   
     
     
         6 . The gas water heater according to  claim 1 , wherein the first cover plate is provided with a side wall plate facing towards the bottom housing, the side wall plate includes a flange bent inwards, and the second cover plate is mounted at a side of the flange facing away from the bottom housing. 
     
     
         7 . The gas water heater according to  claim 1 , further comprising:
 a sound attenuation component disposed in the air inlet channel, the sound attenuation component being mounted at the first cover plate and/or the second cover plate.   
     
     
         8 . The gas water heater according to  claim 7 , wherein the sound attenuation component includes a plurality of regions, the plurality of regions corresponding to different positions, respectively, of the bottom housing in a front-rear direction, and a sound attenuation parameter in one of at least two regions of the plurality of regions of the sound attenuation component being different from a sound attenuation parameter in another one of the at least two regions. 
     
     
         9 . The gas water heater according to  claim 7 , wherein the sound attenuation component has a sound attenuation cavity, and the sound attenuation cavity has a sound attenuation hole at a wall surface of the sound attenuation cavity facing towards the bottom housing. 
     
     
         10 . The gas water heater according to  claim 9 , wherein the sound attenuation cavity is one of a plurality of sound attenuation cavities of the sound attenuation component that are arranged in an array, and each sound attenuation cavity has a plurality of sound attenuation holes arranged in an array. 
     
     
         11 . The gas water heater according to  claim 10 , wherein a volume of one of at least two sound attenuation cavities of the plurality of sound attenuation cavities is different from a volume of another one of the at least two sound attenuation cavities. 
     
     
         12 . The gas water heater according to  claim 11 , wherein:
 the plurality of sound attenuation cavities are located at a surface of the sound attenuation component; and   a projection of the one of the at least two sound attenuation cavities on the surface has a different size than a projection of the other one of the at least two sound attenuation cavities on the surface.   
     
     
         13 . The gas water heater according to  claim 10 , wherein a flow cross-sectional area of a sound attenuation hole corresponding to one of at least two sound attenuation cavities is different from a flow cross-sectional area of a sound attenuation hole corresponding to another one of the at least two sound attenuation cavities. 
     
     
         14 . The gas water heater according to  claim 10 , wherein a density of sound attenuation holes corresponding to one of at least two sound attenuation cavities is different from a density of sound attenuation holes corresponding to another one of the at least two sound attenuation cavities. 
     
     
         15 . The gas water heater according to  claim 7 , wherein the sound attenuation component includes a baffle, an angle between a normal line of at least a part of the baffle and an airflow direction in the air inlet channel being smaller than 30°. 
     
     
         16 . The gas water heater according to  claim 15 , wherein the baffle is in an arc shape and is bent away from the first flow inlet. 
     
     
         17 . The gas water heater according to  claim 1 , further comprising:
 a sealing gasket sandwiched between the cover plate assembly and the bottom housing.