| 摘要 |
PURPOSE:To enable to stabilize ignition by properly maintaining the ratio of combustion air and liquid fuel during the time in low temperature, by providing a means to change the piping resistance of an oil feed pipe in accordance with the change in temperature in combustion air, to the oil feed pipe to feed fuel. CONSTITUTION:A needle 8 as a variable means 6 to vary the piping resistance of an oil feed pipe 2 is movably provided in the piping resistance variable part 7 of a pipe 2. The needle 8 is fixed to a thermally responding element 9, a shape memory alloy for example, in the shape of a spring, provided exposed in an air passage 5. In the normal time when the temperature in combustion air passing through the air passage 5 is higher than a set value, the thermally responding element 9 is contracted. Accompanied with the contraction, the needle 8 is moved and is inserted longer into the piping resistance variable part 7, so that the piping resistance is increased. While at the time when temperature is lower than the set value, the thermally responding element 9 exposed to the air passage 5 is lengthened. The needle 8 is moved being accompanied with the elongation, and the inserted part of the needle 8 into the piping resistance variable part 7 becomes shorter, so that the piping resistance is decreased. The rate of feed oil is increased by the decrease of piping resistance. The moving distance of a neelde 8 is designed so that the feed liquid fuel and the combustion air can get the optimum ratio. |
