JPH0233017Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid fuel combustion device that evaporates and burns liquid fuel, and particularly relates to a liquid fuel combustion device with an improved spark plug mounting structure.

[Description of Prior Art] As shown in FIGS. 1 to 3, a conventional liquid combustion device mainly includes a combustion tube 12 forming a combustion chamber 10 therein, an ignition plug 14, and the ignition plug. 14 is removable, and there is a wick 1 for the wick on the inside.
5, and includes an ignition plug mounting tube 16 fixed to the combustion tube 12, and an annular heat exchanger 18 through which the combustion gas combusted in the combustion tube 12 passes. In this liquid fuel combustion device, the combustion tube 12
Combustion air is sent into the interior from the blast pipe 20. On the other hand, fuel regulated and metered by a solenoid valve 22 and a fuel pump 24 is introduced into the ignition mounting tube 16 through a fuel pipe 26, and a portion of the air from the blast pipe 20 is also introduced into the air pipe 28. sent through.

In this conventional evaporative liquid fuel combustion device that evaporates and burns liquid fuel, the heat exchanger 18 and the combustion tube 12 forming the combustion chamber 10 are
It is integrally formed by sheet metal welding. Further, a spark plug mounting tube 16 to which the spark plug 14 is attached is also attached to the combustion tube 12 by welding. Such a configuration is shown in, for example, Japanese Patent Publication No. 37-5685.

[Problems to be solved by the invention] As described above, in the conventional liquid fuel combustion device, the combustion tube 12 and the heat exchanger 18 are attached by welding, and the ignition plug mounting tube 16 is attached to the combustion tube 12.
is attached by welding. For this reason, conventional liquid fuel combustion devices have had the following various problems.

(1) Welding requires a large number of man-hours, and there is a risk of leakage at the welded area.

(2) Heating during welding may deform the female threaded portion of the ignition plug mounting tube 16 for screwing the ignition plug, and the screwing may not be performed smoothly.

(3) The combustion tube 12 is deformed due to heating during welding,
The flow of combustion air in the combustion chamber 12 may be directed in the direction of the spark plug mounting tube 16, which may worsen combustion.

(4) The inner surface of the ignition plug mounting tube 16 is equipped with a wick 15 made of asbestos or wire mesh that acts as a wick.
However, unburned carbon deposited from the fuel tends to adhere to the wick 15, making it difficult to remove the unburned carbon.

(5) Not only the above-mentioned wick 15 but also the ignition plug mounting tube 16
When the fuel itself continues to burn, it is placed at the highest temperature, and it is placed in the combustion tube 12.
Since the deterioration is faster than that of the combustion chamber, the life of the entire combustion chamber is limited by the life of the spark plug mounting tube 16 and the spark plug 15.

[Purpose of the invention] An object of the invention is to provide a liquid fuel combustion device that facilitates the replacement of components that deteriorate quickly and improves economic efficiency.

[Means for Solving the Problems] The liquid fuel combustion device of the present invention is provided with a wick in the ignition plug mounting tube, and the ignition plug mounting tube is detachably attached to the heat exchanger by fixing means such as bolts. ,
The ignition plug is screwed into and removed from the ignition plug mounting tube.

[Operation] To replace the ignition plug, remove the ignition plug from the ignition plug mounting tube by turning the screw by hand from the outside. When replacing the wick, remove the screw member, separate the ignition plug mounting tube from the heat exchanger, and replace the wick attached to the ignition plug mounting tube. Furthermore,
After removing the ignition plug from the ignition plug mounting tube, inspect and clean the wick through the inside of the ignition plug mounting tube.

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

FIG. 4 is a longitudinal cross-sectional view of one embodiment of the liquid fuel combustion device according to the present invention, and FIG. For example, the combustion tube 30 made of a steel plate such as stainless steel has a large diameter portion 30a for burning liquid fuel and a small longitudinal diameter portion 30b for sending out the combustion gas burned therein, which are fixed by welding. The heat exchanger 32, which exchanges heat between the combustion gas and the fluid to be heated, is formed by casting a metal with high thermal conductivity such as aluminum, and its shape is such that one end is closed and the other end is open. be taken as a thing. A plurality of heat radiating fins 34 are integrally formed on the outer surface of the heat exchanger 32. This heat exchanger 3
2, the combustion tube 30 is located inside the small diameter portion 30a.
is inserted at the beginning.

This heat exchanger 32 also includes a spark plug mounting tube 36.
A mounting seat 38 for mounting the heat exchanger 32 is integrally formed with an insertion hole 39 that communicates with the inside and outside of the heat exchanger 32 and into which the spark plug mounting tube 36 is inserted. A wick 40 made of asbestos, wire mesh, or the like is attached to the inner surface of the spark plug mounting tube 36 and serves as a wick for burning liquid fuel within the combustion tube 30. On the other hand, the large diameter portion 30a of the combustion tube 30 is formed with a hole that matches the insertion hole 39 of the heat exchanger 32 when the combustion tube 30 is attached to the heat exchanger 32.

A blower device 42 for introducing combustion air into the combustion tube 30 includes a casing 44, an electric motor 46, and a rotor 48 driven by the electric motor 46. An intake port 50 and a discharge port 52 for combustion air are opened in the casing 44, and the rotation of the rotor 48 moves the air from the intake port 50 toward the discharge port 52. An end plate 58 is attached to the end of the large-diameter portion 30a of the combustion tube 30. The end plate 58 has a skirt portion 54 integrally formed therein and a swirl guide port 56 for combustion air. The tip of the skirt portion 54 of this end plate 58 is connected to the casing 4.
4, and an annular air passage 60 is formed between the end plate 58 and the casing 44.

The combustion air discharged from the discharge port 52 passes through the annular passage 60 and the swirl guide port 56 to the combustion tube 3.
0 into the large diameter portion 30a. Combustion gas generated by combustion of the liquid fuel in the large-diameter portion 30a of the combustion tube 30 travels along the arrow through the small-diameter portion 30b, reverses at the downstream opening end of the combustion tube 30, and then returns to the above-mentioned state. It passes through an annular passage 62 formed between the inner wall surface of the heat exchanger 32 and the outer peripheral surface of the combustion tube 30 and is exhausted from an exhaust pipe 64 formed integrally with the heat exchanger 32 . A shielding plate 68 supported by a plurality of support legs 66 is attached to the end plate 58, and the shielding plate 68 prevents the combustion air that has flowed into the combustion tube 30 from flowing straight through. A female threaded portion 7 is provided on the inner surface of the ignition plug mounting tube 36.
0 is formed, and the male threaded portion 73 of the ignition plug 71 is screwed into the female threaded portion 70 to attach the ignition plug 71 to the ignition plug mounting tube 36.

Next, a first embodiment of the mounting and fixing means for removably mounting the spark plug mounting cylinder 36 on the mounting seat 38 of the heat exchanger 32 will be described with reference to FIG. A flange portion 74 having a plurality of through holes into which a plurality of screw members 72 can be inserted is integrally provided on the outer periphery of the ignition plug mounting tube 36 . A female threaded portion 76 corresponding to the position of the through hole is provided on the surface of the mounting seat 38 corresponding to the flange portion 74.

When attaching the ignition plug mounting tube 36 to the heat exchanger 32, when the combustion tube 30 is attached to the heat exchanger 32, align the insertion hole 39 of the heat exchanger 32 with the hole of the combustion tube 30, and then attach the ignition plug to the heat exchanger 32. Connect the mounting tube 36 to the heat exchanger 32
into the insertion hole 39 of the mounting seat 38. This ignition plug mounting tube 36 is fixed to the mounting seat 38 by the screw member 72. The ignition plug mounting tube 36 is the mounting seat 3
8, the spark plug mounting tube 3
6 communicates with the inside of the combustion tube 30. When fixing the ignition plug mounting tube 36, a gasket 78 is interposed between the lower surface of the flange 74 and the upper surface of the mounting seat 36, and the stepped portion of the outer peripheral surface near the lower end of the ignition plug mounting tube 36 and the A gasket 82 is interposed between the ignition plug mounting tube insertion hole of the combustion tube 30 and the upper end surface (on the drawing) of the cylindrical peripheral portion 80. Other symbols used in FIG. 6 indicate the same contents as the previously described symbols.

With the above configuration, the ignition plug 71
When replacing the ignition plug 71, manually remove the ignition plug 71 from the outside of the heat exchanger 32 by turning the screw, and then replace the ignition plug 71 with a new one.
Attach.

Further, when replacing the wick 40, by removing the screw member 72, the ignition plug mounting tube 36 provided with the wick 70 can be separated from the heat exchanger 32, and the wick 40 is replaced from the ignition plug mounting tube 36.

Furthermore, if the ignition plug 71 is removed from the ignition plug mounting tube 36, the wick 40 can be inspected and cleaned from the outside through the ignition plug mounting tube 36.

FIG. 7 shows a second embodiment of the ignition plug mounting tube 84.
A male thread 86 is formed on the outer periphery of the mounting seat 3.
The inner surface of the insertion hole of the ignition plug mounting tube 84 of No. 8 includes:
A female thread portion is formed into which the male thread 86 is screwed. When fixing this ignition plug mounting tube 84 to the mounting seat 38, the ignition plug mounting tube 84 is screwed into the female threaded portion of the mounting seat 38, and then the nut 88 is screwed into the male thread 86 thereof.

FIG. 8 shows a third embodiment, in which a large diameter portion 92 is formed on the outer periphery of a spark plug mounting tube 90.
2 has a groove 96 into which the rotation preventing means 94 is fitted.
is formed in the axial direction of the spark plug mounting tube 90. This rotation preventing means 94 prevents the ignition plug mounting tube 90 from rotating when the ignition plug is tightened to the ignition plug mounting tube 90. The lower end surface of the large diameter portion 92 is connected to the cylindrical peripheral portion 8 through a packing 98.
It can be received at the upper end surface of 0. The upper end surface of the ignition plug mounting cylinder 90 is pressed by a plate 100, and by tightening the plate 100 to the female threaded portion 106 of the mounting seat 104 with a screw member 102, the ignition plug mounting cylinder 90 is attached to the heat exchanger 32. Fixed.

FIG. 9 shows a fourth embodiment, in which the upper end surface of the large diameter portion 92 of the ignition plug mounting tube 90 is pressed by a leaf spring 108 instead of the plate 100. Other than that, the configuration is exactly the same as the third embodiment.

[Structure of the invention] As described above, according to the liquid fuel combustion device according to the invention, the ignition plug mounting tube can be easily replaced from the outside of the heat exchanger, and one screw can be removed. By simply removing the ignition plug mounting tube from the heat exchanger, the ignition plug attached to the ignition plug mounting tube can be easily replaced. Additionally, the wick can be inspected and cleaned from the outside by simply removing the ignition plug. Therefore, it becomes easy to replace and maintain the spark plugs and wicks. Furthermore, since the present invention does not require welding of the spark plug mounting tube, the number of man-hours required for welding and the risk of leakage or deformation of members due to welding can be eliminated.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views of a conventional liquid fuel combustion device. Figure 1 is a cross-sectional view of Figure 2, Figure 2 is a cross-sectional view of Figure 1. A partially enlarged view showing the state in which the ignition plug is screwed into the ignition plug mounting tube, FIG.
Cross-sectional views, Figures 6, 7, 8, and 10 are partially enlarged cross-sectional views showing the embodiment of the present invention with the spark plug mounting tube attached to the heat exchanger, and Figure 9 is a cross-sectional view taken along the - line in Figure 8. It is. 30... Combustion tube, 32... Heat exchanger, 36, 84,
90... Spark plug mounting tube, 38, 104... Mounting seat, 4
0...wick, 74...flange, 71...ignition plug, 73
...Male thread part, 76,106...Female thread part, 72,8
6, 102... Threaded member, 80... Peripheral portion, 92... Large diameter portion, 94... Rotating means, 96... Groove, 100
...Plate, 108...Leaf spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Fuel inside a combustion tube is combusted by a spark plug, and the combustion heat is exchanged with a heated fluid by a heat exchanger provided outside the combustion tube. In the liquid fuel combustion device, an ignition plug mounting tube is inserted through the combustion tube and the heat exchanger so that each tip is exposed to the outside of the heat exchanger and the inside of the combustion tube; is removably attached to the heat exchanger from the outside by fixing means, and the spark plug mounting tube is provided with a wick that acts as a wick when burning liquid fuel at a position communicating with the combustion tube on the inner surface of the spark plug mounting tube. A liquid fuel combustion device characterized in that an ignition plug is detachably screwed onto the ignition plug from the outside. (2) The fixing means includes a flange portion integrally formed with the ignition plug mounting tube, a female screw portion provided on the mounting seat of the heat exchanger, and a flange portion for fixing the flange portion to the heat exchanger. The liquid fuel combustion device according to claim 1, characterized in that it consists of a bolt. (3) Claims for registration of a utility model characterized in that the fixing means comprises a male thread provided on the outer periphery of the ignition plug mounting tube and a female threaded portion provided on the mounting seat of the heat exchanger. The liquid fuel combustion device according to item 1. (4) The fixing means includes a large diameter portion integrally formed with the spark plug mounting tube, and a cylindrical peripheral portion integrally formed with the combustion tube for supporting a lower end of the large diameter portion; A plate that presses the upper end surface of the large diameter portion, a bolt provided on the mounting seat of the heat exchanger, and a bolt for fixing the plate to the mounting seat, and the mounting tube rotates around an axis. 2. The liquid fuel combustion device according to claim 1, further comprising a rotating stop means for preventing the liquid fuel from turning. (5) The fixing means includes a large diameter portion integrally formed with the spark plug mounting tube, and a cylindrical peripheral portion integrally formed with the combustion tube for supporting a lower end of the large diameter portion; A leaf spring that presses the upper end surface of the large diameter portion, a female threaded portion provided on the mounting seat of the heat exchanger, a bolt for fixing the leaf spring to the mounting seat, and the mounting tube that is axially centered. The liquid fuel combustion device according to claim 1, which is a utility model, and further comprises a rotation stopper for preventing rotation.