JPH0125862Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid fuel combustion device, and more particularly to a liquid fuel combustion device in which combustion air is swirled into a combustion cylinder using a blower casing. .

[Description of the Prior Art] It is known that in a small-sized evaporative liquid fuel combustion device that performs high-load combustion, combustion efficiency can be increased by generating a swirl within the combustion chamber. In order to generate this swirl inside the combustion chamber, a combustion air swirl guide port is opened at an eccentric position of the end plate of the combustion tube that forms the combustion chamber, and combustion air is introduced into the combustion chamber from this swirl guide port. A liquid fuel combustion device designed to do this has been proposed by the applicant of the present invention (Utility Application No. 5795/1983).

Here, FIG. 1 and FIG. 2 show the configuration of the liquid fuel combustion device. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. An end plate 2 is provided at one end of a combustion tube 1 forming a primary combustion chamber. A swirl guide port 3 for introducing combustion air into the combustion chamber of the combustion tube 1 is formed at an eccentric position of the end plate 2. A blower 4 is installed to send combustion air to the combustion tube 1 with the end plate 2 interposed therebetween. The combustion air sent out from the discharge port 5 of this blower 4 is
The air is introduced into the combustion chamber of the combustion tube 1 from the swirl guide port 3 via the swirl air passage 6 formed between the blower 4 and the end plate 2 . On the other hand, as shown in FIG. 3 as a sectional view taken along the line B-B in FIG. A spark plug mounting tube 14 is provided. An ignition plug 15 is attached to the ignition plug mounting tube 14 so as to be exposed inside the fuel tube 1. A fuel passage 1 is provided inside the outer cylinder 12 and on the side surface of the ignition plug mounting cylinder 14 to reach the inside of the ignition plug mounting cylinder 14 through there.
6 is formed, and fuel is supplied from this fuel passage 16 into the fuel cylinder 1 via the inside of the spark plug mounting cylinder 14. It is formed by the inner circumferential surface of a skirt portion 8 formed on the peripheral edge of the end plate 2 and guide plates 9 and 10 which are curved band-shaped plates. An air guide 7 is attached to the swirl guide port 3, which is the outlet of the swirl air passage 6, for guiding air in a direction to generate a swirl.

[Problems to be solved by the invention] In the conventional liquid fuel combustion device as described above, the guide plates 9 and 10 are connected to the end plate 2.
It is made as a separate part and must be attached to the end plate 2 by welding.

Either the air guide 7 is made as a separate part from the end plate 2 and must be attached to a location near the swing guide port 3 by welding, or the air guide 7 is made as a separate part from the end plate 2 and must be attached to a location near the swing guide port 3 by welding, or the air guide 7 is made as a separate part from the end plate 2. The guide 7 must be molded at the same time, and the press mold becomes more complex than a mold for a simple opening.

For these reasons, it takes a lot of man-hours, and the swirling air passage 6 and air guide 7 are formed by pressing, sheet metal work, and welding, which causes variations in the state of the flow of combustion air flowing into the primary combustion chamber. There are other problems.

[Purpose of the invention] The purpose of the invention is to reduce work costs by eliminating the need for welding the swirling air passages and air guides, and to make it possible to create swirling air passages with a uniform configuration, resulting in uniform accuracy. The object of the present invention is to provide a liquid fuel combustion device that can achieve the desired performance.

[Means for Solving the Problems] In order to achieve the above object, the present invention is such that a combustion air swirling passage and an air guide are integrally formed in the casing of a blower by die-casting.

[Function] A swirling air passage for combustion air and an air guide are integrally formed in the casing of the blower, and the outlet of this swirling air passage is aligned with the swirling guide port of the end plate. This directs air from the blower into the combustion cylinder so as to create a swirl.

[Example] Next, the present invention will be explained based on the drawings.

FIG. 4 is a cross-sectional view showing one embodiment of the liquid fuel combustion device according to the present invention, FIG. 5 is a cross-sectional view taken along the line C-C in FIG. 4, and FIG. 7 is an enlarged sectional view taken along the line E--E in FIG. 6. In this embodiment, the same reference numerals as in the conventional example indicate the same parts.

An end plate 2 provided on the upstream side of the combustion tube 1 has a skirt portion 8 formed on its outer periphery.
The casing 4-1 of the blower 4 is die-cast, and the outer periphery of the side surface of the casing 4-1 is shaped to fit exactly into the skirt portion 8 of the end plate 2. Further, a circular arc groove-shaped swirling air passage groove 6 is formed on the surface of the casing 4-1 of the blower 4 facing the end plate 2, and one end of the swirling air passage groove 6 is connected to a combustion air discharge port 5. I understand. On the other hand, a turning guide opening 3 is formed in the end plate 2 at a position corresponding to the other end of the turning air passage groove 6. The depth of the bottom surface of this swirling air passage groove 6 is determined by the depth of the bottom surface of the swirling air passage groove 6.
The swirling air passage groove 6 is gradually deepened from the vicinity toward the other end, or as shown in FIG. A tapered surface 6-5 having a shallow bottom surface is formed. The tapered surface 6-5 is such that combustion air flows into the combustion tube 1 at an acute angle with respect to the end plate 2. This allows the combustion air to swirl within the combustion tube 1. On the surface of the casing 4-1 facing the end plate 2, in addition to the circular arc groove-shaped swirling air passage groove 6, there is also a cutout 6-4 in order to reduce the weight of the casing 4-1 and save material. It is provided.

Next, the flow of air in the liquid fuel combustion apparatus of the present invention will be explained. When the motor 11 is driven, air is sucked into the blower 4 from the air intake port 4-2, is pressurized by the blower 4, and is sent to the discharge port 5.
The air is introduced into the swirling air passage groove 6 of the casing 4-1, and then sent into the combustion cylinder 1 through the swirling guide port 3. The swirling shape of the swirling air passage groove 6 of the casing 4-1 and the vicinity of the swirling guide port 3 are designed so that the combustion air swirls within the combustion tube 1 when being sent from the swirling guide port 3 into the combustion tube 1. Since the depth of the combustion air is created, the combustion air flows inside the combustion tube 1 while creating a swirl. As a result, the fuel is combusted to generate high-temperature combustion gas, which heats the fluid to be heated via the heat exchanger 12 and then discharges it as exhaust gas from an exhaust port (not shown).

[Effects of the invention] As described above, according to the liquid fuel combustion device according to the present invention, the swirling air passage from the discharge port of the blower to the swirling guide hole of the end plate is formed in the casing of the blower by die-casting. This is what I did. Therefore, compared to the conventional method in which the swirling air passage and the inlet guide are made by pressing, sheet metal, or welding, the number of parts and the number of processing steps can be reduced, resulting in a significant cost reduction.

Furthermore, since the swirling air passage and the inlet guide are formed by die-casting, there is an advantage that the dimensional accuracy is improved and the quality of the combustion device is uniform.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional liquid fuel combustion device.
Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
4 is a sectional view showing an embodiment of the liquid fuel combustion device according to the present invention, FIG. 5 is a sectional view taken along the line C-C in FIG. 4, and FIG. FIG. 5 is a sectional view taken along line D-D of the end plate, and FIG. 7 is an enlarged sectional view taken along line E-E of FIG. 6. 1... Combustion tube, 2... End plate, 3...
Swivel guide port, 4... Blower, 4-1... Blower casing, 6... Swivel air passage groove, 12...
Heat exchanger.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A combustion tube that internally burns liquid fuel to generate combustion gas, a blower that sends combustion air into the combustion tube, and a blower that transfers the heat of the combustion gas to a heated fluid. In an evaporative liquid fuel combustion device having a heat exchanger for exchanging heat, a swirl guide port for introducing combustion air from the blower is provided at an eccentric position of the end plate of the combustion cylinder on the side facing the blower, A liquid fuel combustion device characterized in that a casing of the blower is provided with a swirling air passage groove for guiding combustion air sent from the blower to the swirling guide port. (2) A utility model registration request characterized in that the depth of the swirling air passage groove provided in the casing is set so that it becomes gradually shallower as it approaches the swirling guide hole in the vicinity of the swirling guide hole of the end plate. The liquid fuel combustion device according to scope 1.