JPH0429209Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel dripping prevention device for a pressure spray type oil burner that performs downward combustion.

[Conventional technology]

A pressure spray oil burner that performs downward combustion is normally used in a state as shown in FIG.
That is, a burner 3 having a downwardly directed burner tip 2 screwed into the lower part of the burner tip holder 1 is connected to fuel cutoff valves 4 and 5 by vertical conduits 6 and 7. 8 is a wind box.

FIG. 3 shows the structure of a conventional standard burner chip. A tip attachment screw 10 is provided on the outside of the upper end of the burner tip 2, a strainer attachment screw 11 is provided on the inside of the upper end, and a strainer 12 is attached via this screw 11.

Normally, when the fuel cutoff valves 4 and 5 are closed, the strainer of the burner tip 2 is closed to prevent the fuel in the conduits 6 and 7 between the combustion cutoff valve and the burner tip 2 from flowing out from the tip of the burner tip 2. After removing the strainer, a strainer mounting screw 11 is used to provide a spring pressure type drip prevention valve at the upper part of the burner chip 2 as shown in FIGS. 4 and 5. 13 is a valve body, 14 is a steel ball, 15 is a spring, 16 is a washer, and 17 is a retaining ring.

[The problem that the idea attempts to solve]

The spring-crimped drip prevention valve shown in FIGS. 4 and 5 easily loses its drip prevention function due to damage to the valve, dirt, etc.

Moreover, even if the valve part is normal, the fuel cutoff valve 4,
The fuel sealed between the burner tip 5 and the burner tip 2 undergoes repeated thermal expansion and contraction and air infiltration thereby causing the fuel to flow out.

Furthermore, if the gap between the fuel cutoff valve and the burner tip 2 increases while the fuel cutoff valves 4 and 5 are closed, this may cause a drop in fuel injection pressure, injection failure, injection delay, etc. at the start of the next combustion. ,
There are inconveniences such as the burner misfiring.

The present invention was developed in view of the above points, and by using a siphon to fill the pipe with fuel oil so that the oil inside the pipe does not leak out when the burner is stopped, it is possible to prevent the oil inside the pipe from flowing out. An object of the present invention is to provide a fuel dripping prevention device for a burner that can prevent mis-ignition due to cavitation of the burner.

[Means to solve the problem]

In order to achieve the above object, the fuel dripping device for a burner of the present invention, as shown in FIG. The inner cylinder 18 is screwed onto the screw 11 provided at the upper end, and the outer cylinder 22 is attached so that the inner cylinder is covered with a gap 20 and a gap 21 is formed between it and the inner wall of the burner tip retainer. A passage 23 through which the two gaps 20 and 21 communicate with each other is provided at the lower end of the outer cylinder to form a siphon portion 24.

In addition, remove the conventional strainer and attach the siphon part using the strainer installation screw. Further, the volume V (the volume between the dashed and dotted lines) of the siphon portion 24 must be larger than the volume change due to thermal expansion and contraction of the fuel sealed between the fuel cutoff valve and the burner chip.

[Effect]

Since the siphon part 24 is provided just before the downward burner tip 2, the fuel between the siphon part 24 (the part between the dashed-dotted line) between the inner cylinder 18 and the outer cylinder 22 and the fuel cutoff valves 4 and 5 is will not leak out.

In addition, changes in volume due to thermal expansion and contraction of fuel,
Since the air is absorbed by the volume V of the siphon part 24, air does not enter the upper part.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIG. However, unless otherwise specified, the shapes of the constituent devices and their relative positions described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. Only.

In this embodiment, the strainer of the downward facing burner tip 2 is removed, and a drip prevention device having a siphon portion 24 is provided on the upper part of the burner tip 2 by utilizing the space between the strainer mounting screw 11 and the burner tip holder 1.

That is, in a burner in which the upper part of the downward-facing burner tip 2 is screwed into the lower part of the burner tip holder 1, the inner cylinder (between the siphon outlet) 18 is screwed into the strainer mounting screw 11 provided at the upper end of the burner tip 2. do. Then, an outer cylinder 22 is provided so as to cover the inner cylinder 18 with a gap 20 and to form a gap 21 between it and the inner wall of the burner tip holder 1. Further, a passage 23 through which the two gaps 20 and 21 communicate with each other is provided at the lower end of the outer cylinder to form a siphon portion 24. The volume V between the dashed and dotted lines is the volume of the siphon part.

[Effect of idea]

Since the present invention is configured as described above, it has the following effects.

(1) Since it has a drip prevention function, it is possible to prevent the fuel between the fuel cutoff valve and the downward burner tip from flowing out from the tip of the burner tip while the fuel cutoff valve is closed. Therefore, it is possible to prevent burner misfires due to a drop in fuel injection pressure, injection failure, injection delay, etc. at the start of the next combustion.

(2) By using the burner currently in use and making a slight modification to it, it is possible to provide an inexpensive and perfect drip prevention device.

[Brief explanation of drawings]

Fig. 1 is an explanatory cross-sectional view showing one embodiment of the burner fuel drip prevention device of the present invention, Fig. 2 is an explanatory view of a general burner and its surroundings, Fig. 3 is an explanatory cross-sectional view of a conventional burner chip, and Fig. 4 is an explanatory view of a conventional burner chip. The figure is a sectional view of a conventional spring pressure type drip prevention valve, and FIG. 5 is a plan view thereof. 1... Burner tip retainer, 2... Burner chip, 3... Burner, 4, 5... Fuel cutoff valve, 6,
7... Conduit, 8... Wind box, 10... Chip mounting screw, 11... Strainer mounting screw, 12... Strainer, 13... Valve body, 14... Steel ball, 15...
... Spring, 16 ... Washer, 17 ... Retaining ring, 18 ... Inner cylinder, 20, 21 ... Gap, 22 ...
... Outer cylinder, 23 ... Passage, 24 ... Siphon part,
V... Volume of the siphon part.

Claims (1)

[Scope of utility model registration request] In a burner in which a downward-facing burner tip 2 is screwed into the lower part of the burner tip holder 1, the inner cylinder 1 is attached to a screw 11 provided at the upper end of the burner tip 2.
8 are screwed together, and an outer cylinder 22 is provided so as to cover this inner cylinder with a gap 20 and to form a gap 21 between it and the inner wall of the burner tip retainer, and the two gaps 20 are provided at the lower end of the outer cylinder. , 21 are provided to communicate with each other to form a siphon portion 24.