Premixing device and combustion device including the same

Abstract

In a premixing device A, as a portion opposite to a flow path adjustment member 2 , a first wall surface S 1 of a fuel gas flow path 8 a, 8 b in which a portion is open is provided at a base part 44 of a premixing flow path forming member 4 . The flow path adjustment member 2 has, on a second wall surface part S 2 on a rear surface side of the flow path adjustment member 2 , a claw part 23 able to hold the seal member 7 . The pipe joint part 9 is able to be attached to the base part 44 in a state in which the flow path adjustment part 3 is sandwiched, so that the seal member 7 is sandwiched and pressurized by the first and second wall surface parts S 1 , S 2.

What is claimed is: 
     
         1 . A premixing device, comprising:
 a premixing flow path forming member, forming a premixing flow path for causing air to flow from an end side to an other end side and mixing a fuel gas with the air;   a base part, provided at the premixing flow path forming member, and provided to be attached by a pipe joint part with which a gas pipe is connected, the gas pipe being provided for supply of the fuel gas;   a fuel gas flow path, in which a terminal part is formed as a fuel gas outlet for the fuel gas to flow out to the premixing flow path and which is provided to guide the fuel gas having been supplied to the pipe joint part to the fuel gas outlet;   a flow path adjustment member, having an opening part forming a portion of the fuel gas flow path, the opening part being set with an opening area corresponding to a type of the fuel gas; and   a seal member, provided to seal an attachment position of the flow path adjustment member,   wherein in the premixing device,   as a portion opposite to the flow path adjustment member, a first wall surface of the fuel gas flow path in which a portion is open is provided at the base part,   the flow path adjustment member has, on a second wall surface part on a rear surface side of the flow path adjustment member, a claw part able to hold the seal member, and   the pipe joint part is able to be attached to the base part in a state in which the flow path adjustment part is sandwiched, so that the seal member is sandwiched and pressurized by the first wall surface part and the second wall surface part.   
     
     
         2 . The premixing device as claimed in  claim 1 ,
 wherein the flow path adjustment member comprises:   a body member, comprising a tubular wall part and the claw part, wherein an inner region of the tubular wall part forms a portion of the fuel gas flow path, and the claw part is protrusively provided on an end side of the tubular wall part; and   an auxiliary member, overlapped with the end side of the tubular wall part and having the opening part, the second wall surface part, and a hole part or a notch part through which the claw part is inserted,   wherein the seal member is overlapped with the second wall surface part of the auxiliary member so as to sandwich the auxiliary member with the body member, and is engaged with an engagement part provided at a tip end side of the claw part.   
     
     
         3 . The premixing device as claimed in  claim 1 ,
 wherein the flow path adjustment member comprises a tubular wall part in which an inner region forms a portion of the fuel gas flow path, and the second wall surface part on which the opening part is provided and the claw part are integrally formed on the tubular wall part.   
     
     
         4 . The premixing device as claimed in  claim 1 ,
 wherein a first concave part having an opening shape on a front surface is provided at the base part, and the flow path adjustment member is able to be set to a state in which a rear side portion thereof is fit in the first concave part, and   in a state in which the pipe joint part is removed from the base part, a front side portion of the flow path adjustment member is configured to protrude outwardly toward a front side of the base part.   
     
     
         5 . The premixing device as claimed in  claim 1 ,
 wherein a second concave part into which the claw part is able enter is provided on the first wall surface part of the base part.   
     
     
         6 . The premixing device as claimed in  claim 1 ,
 further comprising a partition wall part, partitioning the premixing flow path into first and second flow paths into parallel arrangement,   wherein the fuel gas flow path is branched into a first fuel gas flow path and a second fuel gas flow path, and the first fuel gas flow path and the second fuel gas flow path are provided with, as the fuel gas outlet, a first fuel gas outlet and a second fuel gas outlet through which the fuel gas is able to flow to the first flow path and the second flow path, and   as the opening part of the flow path adjustment member, a first opening part and a second opening part corresponding to the first fuel gas flow path and the second fuel gas flow path are provided.   
     
     
         7 . The premixing device as claimed in  claim 6 , wherein the flow path adjustment member comprises a tubular wall part in which an inner region forms a portion of the fuel gas flow path, and
 as the opening part of the flow path adjustment member, a third opening part located upstream of the first opening part and the second opening part in a fuel gas flow direction, and the fuel gas passing through the third opening part is configured to travel to the first opening part and the second opening part.   
     
     
         8 . A combustion device, comprising the premixing device as claimed in  claim 1 .