EXHAUST PURIFICATION DEVICE BURNER

摘要

This burner is disposed at the upstream side of a DPF and raises the temperature of exhaust by combusting an air-fuel mixture of air and fuel in a combustion region within a flame holder. The burner is provided with: an upstream-side cover enclosing the peripheral wall of the flame holder; and a partition wall that partitions the gap between the flame holder and the upstream-side cover into a prior-stage exhaust chamber and a latter-state exhaust chamber. An exhaust tube through which exhaust from an engine flows is connected to the upstream-side cover; a through hole that interconnects the prior-stage exhaust chamber and the latter-stage exhaust chamber is formed at the partition wall; exhaust flows in from the exhaust tube at the prior-stage exhaust chamber; and exhaust flows in from the prior-stage exhaust chamber through the through hole to the latter-stage exhaust chamber.

主权项

1. A burner for an exhaust purification device, comprising:
a tubular flame stabilizer having a space including a combustion area, in which air-fuel mixture of fuel and air is combusted, an ejection port for ejecting combustion gas, a small diameter portion, and a large diameter portion having an inner diameter larger than the small diameter portion; a tubular cover that surrounds the flame stabilizer, wherein a gap is formed between an inner circumference face of the cover and an outer circumference face of the flame stabilizer; an exhaust pipe connected to the cover to deliver exhaust gas into the gap; and a partition portion arranged in the gap to partition the gap into an upstream exhaust chamber and a downstream exhaust chamber, wherein the partition portion is arranged between an outer circumference face of the large diameter portion and the inner circumference face of the cover in the gap, wherein the upstream exhaust chamber is connected to the exhaust pipe and the downstream exhaust chamber, and the downstream exhaust chamber is connected to the ejection port of the flame stabilizer.