JP2713025B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus which vaporizes a liquid fuel, mixes it with combustion air, sends it as a combustible mixture to a burner head, and ignites and burns.

[0002]

2. Description of the Related Art Conventionally, this kind of liquid fuel combustion apparatus is shown in FIG.
This will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a vaporizing cylinder in which a sheath heater 2 is integrally cast and embedded in a side wall portion, and has a receiving surface 1a formed inside the upper surface. Reference numeral 3 denotes a nozzle portion connected to the lower side of the side surface of the vaporizing cylinder 1, which is provided coaxially with a needle pipe 4 for supplying liquid fuel into the vaporizing cylinder 1. Reference numeral 5 denotes a throttle member placed in the vaporizing cylinder 1 with its outer peripheral portion placed on the receiving surface 1a, and reference numeral 6 denotes a pressure equalizing plate placed on the upper surface of the throttle member 5. Reference numeral 7 denotes a burner head having a large number of flame holes 8 and a wire mesh 9 wound tightly around its outer peripheral surface, and a vaporizing cylinder 1 formed by screws 11 together with an annular flame holding ring 10 provided around the burner head 7. Is fixed at the top.

Next, the operation will be described. The sheath heater 2 heats the vaporizing cylinder 1 to a temperature (about 250 ° C.) necessary for vaporizing the fuel.
(~ 300 ° C). When the vaporizing cylinder 1 is preheated, combustion air (not shown) enters the vaporizing cylinder 1 from the nozzle portion 3.
When the liquid fuel is sent from the needle pipe 4 into the vaporization cylinder 1, the liquid fuel sent from the needle pipe 4 is atomized and pushed out by the blast pressure of the combustion air, and is pushed into the vaporization cylinder 1. Fuel and air are fed at a predetermined ratio.

The fuel fed into the vaporizing cylinder 1 is
When it collides with the inner side wall surface, it is vaporized by the heat of the vaporization cylinder 1,
A combustible air-fuel mixture with the combustion air is generated, and then sent to the burner head 9 via the throttle member 5 and the equalizing plate 6.
After being rectified and jetted at a predetermined jet pressure through the flame hole 7 and the wire mesh 8, it is ignited by an appropriate ignition means (not shown) such as a discharge spark, and the primary combustion flame 12 and the secondary combustion flame 13 are formed. Form and burn.

[0005]

The conventional liquid fuel combustion apparatus is configured as described above, and the throttle member 5 has only the outer peripheral lower surface mounted on the receiving surface 1a with respect to the vaporizing cylinder 1. It had a flat seal structure. For this reason, the temperature difference between the vaporization cylinder 1 and the throttle member 5 during the transition from the completion of preheating and the transition from the maximum heat generation amount to the minimum heat generation amount and from the minimum heat generation amount to the maximum heat generation amount causes the lower surface of the outer peripheral portion of the throttle member 5 and the vaporization cylinder 1 to move. If there is a slight gap with the receiving surface 1a, this gap is enlarged.

[0006] In addition, a large gap may be generated due to variations in the surface accuracy and the dimensional shape of the upper surface of the receiving surface 1a of the vaporizing cylinder 1 and the lower surface of the outer peripheral portion of the throttle member 5 in manufacturing. For this reason, as shown in FIG. 5, the combustible air-fuel mixture in the vaporization cylinder 1 directly enters the burner head 9 from this gap without passing through the throttle member 5 and the equalizing plate 6. Therefore, there is a problem that the combustion flame partially burns red fire or the like, causing incomplete combustion to generate an odor or deteriorating safety.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems as described above, and it is possible to eliminate a gap between a receiving surface of a vaporizing cylinder and a lower surface of an outer peripheral portion of a throttle member so that stable combustion can be performed and a safe liquid can be obtained. A fuel combustion device is provided.

[0008] A liquid fuel combustion apparatus according to the present invention is provided with a bottomed cylindrical vaporizing cylinder that vaporizes liquid fuel and mixes combustion air to generate a combustible air-fuel mixture, and is provided above the vaporizing cylinder. A burner head having a large number of flame holes, and a throttle member provided between the burner head and the vaporization cylinder, and a throttle member for contracting and supplying the swirling air-fuel mixture in the vaporization cylinder to the burner head; In the liquid fuel combustion device in which the lower surface of the outer peripheral portion is placed on a receiving surface formed on the peripheral edge of the upper opening of the vaporizing cylinder, an annular convex portion is provided on the lower surface of the outer peripheral portion of the throttle member, and the receiving surface of the vaporizing cylinder is provided. Are provided with annular concave portions, which are closely fitted to each other to form a labyrinth structure in the mounting portion.

[0009]

According to the structure of the present invention, since a rabbins structure is formed between the receiving surface of the vaporizing cylinder and the lower surface of the outer peripheral portion of the throttle member, the sealing property is ensured, and the completion of preheating and the transition of the calorific value are achieved. There is no leakage of the combustible air-fuel mixture even if there is a variation in the size in terms of the production or the production. Therefore, stable combustion can always be continued.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a picture-defined fuel combustion apparatus according to an embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof. In FIGS. 1 and 2, reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder in which a sheath heater 2 is integrally embedded in a side wall portion and cast. An annular concave portion 1 b is formed inside the upper surface of the vaporizing cylinder 1. A receiving surface 1a is formed. Meanwhile, the aperture member 5
An annular convex portion 5a is provided on the lower surface of the outer peripheral portion of the diaphragm member 5. The annular convex portion 5a of the diaphragm member 5 and the annular concave portion 1
and b are closely fitted to each other to form a labyrinth structure in the mounting portion. Except for the above, the configuration is the same as the configuration of the conventional example described with reference to FIG.

Next, the operation will be described. Since the operation of combustion is the same as that of the conventional example, the description is omitted.

According to the configuration of the above embodiment, a labyrinth structure is formed between the receiving surface 1a of the vaporizing cylinder 1 and the lower surface of the outer peripheral portion of the throttle member 5 by fitting the annular concave portion 1b and the annular convex portion 5a. Therefore, the sealing property between the receiving surface 1a of the vaporizing cylinder 1 and the lower surface of the outer peripheral portion of the throttle member 5 is reliably ensured, and leakage of the combustible air-fuel mixture from the gap seen in the conventional configuration is surely eliminated. be able to. Therefore, it is possible to form a stable flame and eliminate the generation of odor, as well as to enhance safety.

Embodiment 2 FIG. FIG. 3 is an enlarged view of a main part showing another embodiment of the present invention, in which a sectional shape of an annular concave portion 1b formed on a receiving surface 1a of a vaporizing cylinder 1 and an annular convex portion formed on a lower surface of an outer peripheral portion of a throttle member 5 are shown. 5a has a V-shaped cross-section, so that workability during fitting can be improved,
It is possible to cope with some dimensional variation, and the same operation and effect as those of the first embodiment can be obtained.

[0014]

As described above, according to the liquid fuel combustion apparatus of the present invention, the sealing performance between the receiving surface of the vaporizing cylinder and the lower surface of the outer peripheral portion of the throttle member is improved. Leakage can be reliably eliminated, stable combustion can be realized, and a liquid fuel combustion device with further improved safety can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a liquid fuel combustion device according to the present invention.

FIG. 2 is an enlarged view of a main part of the embodiment shown in FIG.

FIG. 3 is an enlarged view of a main part of another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a conventional liquid fuel combustion device.

FIG. 5 is an enlarged view of a main part of the conventional example shown in FIG.

[Explanation of Signs] 1 Vaporization cylinder 1a Receiving surface 1b Annular recess 5 Aperture member 5a Annular recess 9 Burner head

Claims (1)

(57) [Claims] A burner head having a bottomed cylindrical vaporizing cylinder for vaporizing a liquid fuel and mixing a combustion air to generate a combustible air-fuel mixture, and a plurality of flame holes provided at an upper portion of the vaporizing cylinder. When provided between the burner head and the vaporization tube, and a diaphragm member to be supplied to the burner head by passing condensation of turning air-fuel mixture in the vaporizing tube, the outer peripheral portion of a diaphragm member
In a liquid fuel combustion device having a surface mounted on a receiving surface formed on an upper opening peripheral edge of the vaporizing cylinder, an annular convex portion is provided on a lower surface of an outer peripheral portion of the throttle member, and an annular concave portion is provided on a receiving surface of the vaporizing cylinder. , And a labyrinth structure is formed in the mounting portion by closely fitting these components to each other .