JPH018846Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a combustion device used in oil fan heaters and the like.

Conventional configuration and problems thereof Generally, this type of combustion apparatus is designed to be able to switch the combustion amount between strong and weak levels, and the combustion air passage is provided with an air amount adjusting means for this purpose. As shown in FIGS. 6 and 7, a damper 22 that opens and closes the air passage 21 is used as the air amount adjusting means. This damper 22 has a diameter of 5 mm so that when the air passage 21 is blocked, a small amount of air suitable for weak combustion flows.
Two holes 23a and 23b of about mm size are formed,
When the damper is closed, air is supplied through the holes 23a and 23b. However, there was a problem in that noise was generated by the air passing through the holes 23a and 23b during this weak combustion, and the noise level did not decrease much even after switching to weak combustion. Particularly in the case of open-type combustion devices that emit combustion gas indoors, noise tends to leak to the outside, which is a big problem.

Purpose of the invention The present invention was made in view of the above points, and is aimed at reducing the noise level during weak combustion.

Structure of the Invention In order to achieve the above object, the present invention is such that the holes provided in the damper are made small in diameter and are dispersed around the periphery of the damper.

DESCRIPTION OF THE EMBODIMENTS An example of the embodiment will be explained using a vaporization type combustion apparatus as an example. 1 is a vaporization cylinder, 2 is a nozzle for supplying fuel to this vaporization cylinder, and is connected to a tank 3a via a pump 3. I've let it happen. 4 is a burner case that covers the outer periphery of the vaporization cylinder 1; 5 is a combustion air passage that supplies air into the burner case 4 and the vaporization cylinder 1; it is connected to the fan 6; A filter consisting of a net or the like is removably attached. 8 is a valve seat provided in the middle of the air passage 5; 9 is a damper that opens and closes this valve seat 8;
It is driven by a solenoid 10 to open and close the valve seat 8 in conjunction with switching the combustion amount. As shown in FIG. 4, this damper 9 has a large number of small holes 11 formed around the solenoid shaft 10a, that is, over the entire peripheral edge of the damper. In this embodiment, the small holes 11... have a diameter of
The diameter of the hole is 1.5 mm, which is extremely small compared to the conventional hole diameter of 4.5 mm. Note that 12 in the figure
1 is a burner head having a flame hole 12a, 13 is a rectifying plate made of a wire mesh or the like, 14 is an ignition electrode, 15 is a flame rod, and 16 is a heater for heating the vaporization cylinder.

In the above configuration, the air sucked into the air passage 5 via the filter 7 is supplied into the vaporization tube 1 via the damper section, where it is mixed with the vaporized gas supplied from the nozzle 2 and vaporized. The mixed gas is ejected from the flame hole 12a and combusted. Then, the damper 9 is controlled to open or close by energizing or de-energizing the solenoid 10, and the combustion amount is switched between strong and weak. Of course, at this time, the energization to the pump 3 is also controlled and switched depending on the amount of fuel.

Here, when weak combustion is performed, the damper 9 closes the valve seat 8 as shown in FIG.
It flows to the vaporization cylinder side through a large number of holes 11 provided in the. When the noise level was measured at this time, it was 37 dB compared to 40 dB with the conventional model, which was a noise reduction of about 3 dB. Although the reason is not clear, the hole 11 provided in the damper 9
... is provided over the entire area of the damper periphery, and the air passing through the damper portion passes through the damper periphery almost uniformly, eliminating the turbulent flow that occurs when air is concentrated in two holes as in the conventional case. It is thought that this is because the noise caused by the small holes 11 is eliminated, and because the diameter of each small hole 11 is small, the air passage resistance is large as a whole, and as a result, the flow velocity when passing through the small holes 11... is reduced. It will be done.

FIG. 5 shows the relationship between the diameter of the small holes 11 and the noise value, and it was found that a small hole diameter of 2.0 mm or less is effective in reducing noise.

By the way, since the small holes 11 provided in the damper 9 are approximately 2 mm in diameter, there is a risk that they may become clogged with dirt or the like. Therefore, in this combustion device, a filter 7 is provided at the end of the air passage 5 on the suction port side, and the filter 7 is made of a mesh mesh having an opening area smaller than the opening area of the small holes 11 of the damper 9. It exists as a body.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, the noise generated when air passes through the damper can be reduced, and the noise level during weak combustion can be compared to the noise level during strong combustion. It is possible to provide comfortable low-combustion heating as the damper is lower than the above, and even if the damper has small holes of 2 mm or less, it can be used safely without worrying about clogging with dirt.
The effect is great.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a combustion device according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts, and Fig. 3 is an enlarged sectional view of the main parts.
The figure is an enlarged cross-sectional view during weak combustion, Figure 4 is a plan view of the damper, Figure 5 is a graph showing noise characteristics, Figure 6 is a cross-sectional view showing the conventional example, and Figure 7 is a plan view of the damper. It is. 5...Air passage, 7...Filter, 9...Damper, 11...Small hole.

Claims (1)

[Scope of utility model registration request] A damper for air adjustment is provided in the combustion air passage provided with a filter, and this damper is configured to open and close the combustion air passage, and also forms a number of small holes through which a small amount of air flows when the air passage is closed. The small holes are set to have a small diameter of 2 mm or less and are provided throughout the periphery of the damper, and the mesh of the filter is smaller than the diameter of the small holes of the damper.