JPH0115767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air supply device for a combustor such as an oil fan heater.

Structure of conventional example and its problems In the conventional air supply system for a combustor, for example, the air supply system for an oil fan heater, the end of the air supply path is opened to the outside of the equipment exterior as shown in Figs. A filter body 2 is provided in this opening to prevent dust from adhering to the air supply path 21 such as the air supply fan 22 and damper 23, reducing the amount of air and worsening the combustion state.
4 is provided. However, if the filter body 24 is placed against a wall or is covered with a curtain or the like and the filter body 24 is blocked, it becomes impossible to supply an amount of air suitable for combustion.
There were problems such as incomplete combustion.

Conventionally, as a countermeasure against this problem, a protrusion 24a is provided at the outer end of the filter body 24 to maintain a gap between the filter body 24 and the wall, as shown in FIG. It did not have sufficient effect on cloth.

FIG. 3 shows another conventional example in which a recess 24b is provided in the fitting surface between the air supply cover 25 and the filter body 24, and air is sucked in through the gap between the recess 24b. The air sucked in through the gap does not pass through the filter body,
There was a problem that dirt etc. were allowed to enter the air supply path.

Purpose of the Invention The present invention was made in view of the above-mentioned problems, and its object is to enable the amount of air necessary for combustion to be supplied through the filter body even when the filter body is blocked by a wall. be.

Structure of the Invention In order to achieve the above object, the present invention forms a filter body as a bottomless double cylinder, the inner cylinder is used as a fitting part with the air supply path, and the outer end thereof is the outer end of the outer cylinder. It is shorter in height.

DESCRIPTION OF EMBODIMENTS One embodiment of the present invention will be described below using FIGS. 4 and 5, taking the case of a vaporization type combustion apparatus as an example. Reference numeral 1 denotes a carburetor cylinder, and 2 a nozzle for supplying fuel to the carburetor cylinder 1, which is communicated with a tank 4 via a pump 3. 5 is a burner case that covers the outer periphery of the vaporization cylinder 1; 6 is an air supply path that supplies air into the burner case 5 and the vaporization cylinder 1, and is connected to a fan 7. Further, an air supply cover 8 constituting a part of the air supply path is provided at the end of the air supply path, and a filter body 9 made of a net or the like is detachably attached thereto.

The filter body 9 is a bottomless double cylinder, and one end of the outer cylinder 9a also serves as a fitting part with the air supply cover 8. Further, the outer end of the inner cylinder 9a is set to be shorter than the outer end of the outer cylinder 9b. The filter body 9 has a mesh body 9c integrally formed inside the outer cylinder 9b.
c is partitioned into two surfaces, an inner side and an outer side, by an inner cylinder 9a. Furthermore, a protrusion 9d is provided on the inside of the inner cylinder 9a of the filter body 9, and the protrusion 9d is set higher than the inner cylinder 9a.

In the figure, 10 is a valve seat provided in the middle of the air supply path 6, 11 is a damper that opens and closes this valve seat 10, and is driven by a solenoid 12, which opens and closes the valve seat 10 in conjunction with switching the combustion amount. It is designed to open and close. Further, in the upper part of the vaporizing cylinder 1, a burner head 13 having a flame hole 13a, a rectifying plate 14 made of a wire mesh or the like,
An ignition electrode 15, a flame rod 16, etc. are provided, and a vaporization heater 17 is embedded inside the vaporization cylinder 1.

In the above configuration, air sucked into the air supply path 6 by the air supply fan 7 via the filter body 9 is supplied into the vaporization cylinder 1 via the damper section, where it is supplied from the nozzle 2 and vaporized. The premixed gas is mixed with the vaporized gas, which is ejected from the flame hole 13a and burned. By energizing and de-energizing the solenoid 12, the damper 11 is controlled to open and close, and the combustion amount is switched between strong and weak states. Of course, at this time, the energization to the pump 3 is also controlled to change the amount of combustion.

Normally, the air necessary for combustion is supplied to the inner cylinder 9a of the filter body 9 by an air supply fan 7 as shown in FIG.
The air supply path 6 passes only through the inside of the
This is what is sucked into the filter body 9.
When the air is pressed against the wall surface, as shown in FIG.
a, and is sucked into the air supply path 6.

In addition, when the filter body 9 is covered with a cloth such as a curtain, the cloth covers the outer tube 9b and the protrusion 9.
d, and remain separated from the net body 9c and the inner cylinder 9a, and the air passage is no longer blocked by the cloth, eliminating the problem of a decrease in air volume.

Furthermore, in any case, the air is
Since the air passes through the air supply path 6, the problem of dirt and the like entering the air supply path 6 is eliminated.

Effects of the Invention As described above, according to the present invention, even if the filter body is pressed against the wall surface, the combustion air flows through the filter section between the outer cylinder and the inner cylinder, so the amount of combustion air can be reduced. It is possible to prevent the fuel from decreasing or causing abnormal combustion.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional combustor, Fig. 2 is an external perspective view of a filter body of the same combustor, Fig. 3 is an external perspective view of another filter body, and Fig. 4 is an embodiment of the present invention. FIG. 5 is a cross-sectional view of the combustor in the example, and FIG. 5 is a cross-sectional view of the essential parts. 6... Air supply path, 9... Filter body, 9a...
Inner cylinder, 9b...Outer cylinder, 9c...Network, 9d...Protrusion.

Claims (1)

[Scope of Claims] 1. An air supply passage for supplying combustion air to a burner, and a filter body fitted into an end opening of the air supply passage, the filter body being fitted into an end opening of the air supply passage. It consists of an inner cylinder attached to the inner cylinder, an outer cylinder disposed around the outer periphery of the inner cylinder, and a net covering between the inner and outer cylinders and inside the inner cylinder, and the outer end of the inner cylinder is the outer end of the outer cylinder. This air supply device for a combustor is made shorter in height than the previous model, so that air flowing in from between the inner and outer cylinders overcomes the outer end of the inner cylinder and flows into the air supply passage from inside the inner cylinder. 2. The air supply device for a combustor according to claim 1, wherein the inner cylinder side net of the filter body is provided with a protrusion that is taller than the outer end of the inner cylinder.