| 摘要 |
<p>A flame hole member of a tubular burner has a front plate and a rear plate both of sheet metal make. The front plate has a first flame hole in the central portion of the front plate, and a plurality of second flame holes located around a periphery of the first flame hole, each of the second flame holes being of a slit shape in a width below a quenching distance. The rear plate has a first ventilation hole in the central portion of the rear plate, and a plurality of second ventilation holes of smaller diameter than the first ventilation hole, each of the second ventilation holes being located around a periphery of the first ventilation hole. At least one of the rear plate and the front plate is provided with a cylindrical section for introducing into the first flame hole the mixture of the fuel gas and primary air flowing into the first ventilation hole. 2a 23a 4a 4b "Zn 2u 2b 2a 51</p> |
