JPH0335943Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to adjusting the amount of air mixed with sprayed fuel, and in particular, to automatically adjust the amount of secondary air to facilitate and ensure ignition. The present invention relates to an oil burner suitable for.

[Conventional technology]

Conventionally, a pressure spray nozzle and a spark plug were built in the center of the draft tube and a spark plug near its tip, a stabilizer was placed in front of the pressure spray nozzle, and an annular groove was installed between the outer periphery of the stabilizer and the inner surface of the draft tube. In an oil burner in which a secondary air supply path and a primary air hole were formed in the center of the stabilizer, the stabilizer had a fixed structure and the air supply area of each of the primary and secondary sides remained constant. Therefore, the volumetric flow rate of the inhaled air remains constant regardless of changes in temperature.
The air-fuel ratio A/F, expressed as the mass flow rate ratio of fuel F and air A, becomes substantially larger during winter when the air temperature is low and the air density is high.

[Problem that the invention attempts to solve]

Conventionally, when low-temperature air is sucked into the burner in winter, when the air mass flow rate is substantially large even if the fan speed is the same, the air-fuel ratio at the time of ignition becomes large, making it difficult to ignite. The ignition flame tended to lift due to excess air, and it took time for the flame to become completely stable (flame holding), causing problems such as oscillating combustion.

An object of the present invention is to provide an oil burner that automatically expands the area of the secondary air supply path when the intake air temperature decreases to facilitate and ensure ignition.

[Means for solving problems]

In order to achieve the above object, the present invention incorporates a pressure spray nozzle and a spark plug in a draft tube, and also arranges a stabilizer in front of the pressure spray nozzle, and an annular secondary air supply path around the outer periphery of the stabilizer. In this oil burner, a small stabilizer piece is attached to the stabilizer via a shape memory alloy hinge, and the effective area of the secondary air supply passage is expanded during low-temperature ignition.

[Effect]

According to the present invention, the stabilizer placed inside the oil burner forms an annular secondary air supply path around its outer periphery, while the stabilizer is provided with an opening, and the stabilizer small piece that opens and closes the opening is shaped. Because it is attached to the stabilizer via a memory alloy hinge, the effective area of the secondary air supply channel is expanded during low-temperature ignition, but once combustion begins and the temperature reaches high temperatures, the stabilizer small pieces block the opening. The secondary air volume decreases.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 2, a pressure injection nozzle 6 is built in the center of the draft tube 5, and a spark plug 7 is built in near the tip of the pressure injection nozzle 6. In an oil burner in which a stabilizer 1 is arranged in front and an annular secondary air supply path 10 is formed between the outer periphery of the stabilizer 1 and the inner surface of the draft tube 5, at least one piece is provided on the outer periphery of the stabilizer 1, In the embodiment, several openings 4 are provided, and the openings 4 are movable to open and close, and the stabilizer piece 2, which has almost the same shape as the openings 4, is attached to an L-shaped shape memory alloy hinge 3. The stabilizer 1 is attached to the front surface of the stabilizer 1 with screws 11, etc., and the effective area of the secondary air supply path 10 is expanded during low-temperature ignition.

The shape memory alloy hinge 3 is bent into a substantially right-angled L-shape at room temperature, and the stabilizer 1 is bent so as to open the opening 4 on the outer periphery of the stabilizer 1.
The stabilizer small piece 2 is made to protrude forward in the front direction, but when combustion starts and the temperature rises, the bending of the shape memory alloy 3 changes to an obtuse angle, so the stabilizer small piece 2 is moved in the direction of closing the opening 4. Ru.

Next, the operation of the present invention will be explained.

At the start of low-temperature combustion, the stabilizer 1 and the stabilizer small piece 2 are at room temperature, so they are bent into an almost right-angled L-shape as shown in FIG. 4 is opened to enlarge the secondary air supply path 10. Therefore, the passage cross-sectional area of the secondary air 8 formed by the inner surface of the draft tube 5 and the outer periphery of the stabilizer 1 is large, and a large amount of the air sucked into the oil burner flows toward the secondary air 8 side, and the primary air 9 The amount of air passing through the side is reduced and the flow velocity of the primary air 9 is reduced, and the oil burner is easily ignited and flame stabilized.

Combustion begins and the temperature rises, shape memory alloy 3
When heated, as shown in FIG. 4, the almost right L-shaped angle changes to an obtuse angle to move the stabilizer piece 2, and the opening 4 is closed to create a predetermined amount of primary air. The secondary air volume is distributed between
Good combustion will continue. In other words, in combustion in an oil burner, the combustion state changes depending on the air-fuel ratio A/F, which is expressed as the mass flow ratio of air A and fuel F. However, with this invention, the combustion state of the combustion is changed depending on the air-fuel ratio A/F, which is expressed as the mass flow ratio of air A and fuel F. Even in this case, ideal combustion can be maintained because the air-fuel ratio can be kept almost constant by changing the secondary air supply path as the temperature rises due to combustion.

[Effect of idea]

According to the present invention, by providing an opening in the oil burner stabilizer and attaching a small stabilizer piece that opens and closes this opening via a shape memory alloy hinge, secondary air can be maintained even in winter when the air temperature is low. Since the volumetric flow rate can be adjusted and the air-fuel ratio is kept almost constant, ignition is easy and reliable, and flame holding is sufficient for a short time.
Good combustion can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a partially enlarged view of FIG. 1, and FIGS. 3 and 4 are sectional views for explaining the operation of the present invention. 1... Stabilizer, 2... Stabilizer small piece, 3... Shape memory alloy hinge, 4... Opening, 5
...Draft tube, 6...Pressure spray nozzle, 7...
Spark plug, 10...Secondary air supply path.

Claims (1)

[Claims for Utility Model Registration] (1) A pressure spray nozzle and a spark plug are built into the draft tube, and a stabilizer is disposed in front of the pressure spray nozzle, and an annular secondary air supply path is provided around the outer periphery of the stabilizer. 1. An oil burner comprising: a small stabilizer piece attached to the stabilizer via a shape memory alloy hinge to expand the effective area of the secondary air supply path during low-temperature ignition. (2) Utility model registration claim 1, characterized in that at least one opening is provided on the outer periphery of the stabilizer, and the stabilizer small piece is attached via the L-shaped shape memory alloy hinge.
Oil burner as described in section.