JPH0144895Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is characterized in that an ignition plug is arranged surrounded by a cylindrical member that opens in a cylindrical wall of a combustion chamber, and auxiliary air is supplied around the ignition plug to fill the inside of the cylindrical member. The present invention relates to a liquid fuel combustion device that helps the combustion of supplied liquid fuel and prevents unburned carbon of the liquid fuel from accumulating around the spark plug.

A conventional example of a liquid fuel combustion apparatus having the above structure will be explained with reference to FIGS. 3 and 4. Reference numeral 1 denotes a combustion chamber, 2 a cylindrical wall of the combustion chamber 1, and 3 an opening in the combustion chamber 1. The cylindrical member is fixed to a heat exchange wall 5 by a flange 4, and an ignition plug 6 is disposed in the center. A liquid fuel introduction pipe 7 and an auxiliary air introduction pipe 8 are opened in the cylindrical member 3 . Reference numeral 9 denotes a wick attached to the inner peripheral surface of the cylindrical member 3.
10 is an end wall on the upstream side of the combustion chamber 1, 11 is a main combustion air inlet, 12 is a combustion air blower,
The casing 13 and the impeller 14, the impeller 1
4 is driven by an electric motor 16 fixed to the lid 15 of the housing 13. Reference numeral 17 denotes a discharge port of the combustion air blower 12, and the air blown from the discharge port 17 is sent into the combustion chamber 1 from the main combustion air inlet 11 through the swirling air passage 18.
Reference numeral 19 denotes an auxiliary air take-off pipe, which is connected to the auxiliary air introduction pipe 8 through a flexible pipe 20. FIG. 4 is a view of the combustion air blower 12 removed from the combustion chamber 1 and viewed from the direction of the arrow, and the reference numerals in FIG. 4 indicate the same parts as in FIG. 3. However, the cylindrical member 3, the spark plug 6, and the auxiliary air introduction pipe 8 are shown with imaginary lines (dashed lines) to show the connection relationship of the auxiliary air passage. In the conventional configuration shown in FIGS. 3 and 4, the auxiliary air take-off pipe 19 is attached to the lowest discharge port of the casing 13 of the combustion air blower 12, and the auxiliary air is supplied upward through the flexible pipe 20. Because the fuel vapor is led to the auxiliary air introduction pipe 8 located in the auxiliary air introduction pipe 8, fuel vapor may flow back through the auxiliary air introduction pipe 8 and condense due to ignition errors in the combustion device, blowback in the combustion chamber, or liquid fuel. directly flows into the auxiliary air introduction pipe 8 and the flexible tube 20, flows down, and accumulates in the auxiliary air take-off pipe 19, obstructing the flow of the auxiliary air. As a result, carbon from unburned fuel accumulates inside the cylindrical member 3 and around the ignition plug 6, making it difficult to ignite or continue burning the fuel. In view of the above-mentioned drawbacks of the conventional structure, the present invention aims to provide a liquid fuel combustion device that does not impede the flow of auxiliary air. A groove constituting the combustion air blower housing is provided on the downstream end surface of the combustion air blower housing, and the groove is formed integrally with the swirling air passage 18 with an upward slope upward from the swirling air passage 18 that guides the main combustion air. There is a particular thing. The liquid fuel combustion apparatus of the present invention will be explained in detail below with reference to FIGS. 1 and 2. Figure 1 is a longitudinal sectional view of the liquid fuel combustion device of the present invention.
Reference numerals 1 to 18 indicate the same parts as in FIGS. 3 and 4, and FIG. 2 is a view in which the combustion air blower 12 is removed from the combustion chamber 1 in FIG. The same reference numerals as in the figure indicate the same parts as in the case of FIG. It branches off from the air passage 18. The groove portion 21 constituting the auxiliary air passage communicates with a discharge pipe 25 through passages 23 and 24, and the discharge pipe 25 and the auxiliary air introduction pipe 8 are connected by a short flexible pipe 26. . Next, the operation of the liquid fuel combustion device of the present invention will be explained.

Liquid fuel is supplied into the cylindrical member 3 from the liquid fuel introduction pipe 7 by a fuel pump (not shown), is supported by the wick 9, is heated by the ignition plug 6, and is ignited to continue combustion. After the combustion starts, the ignition plug 6 is de-energized and the combustion continues using the heat generated by fuel combustion. The flame and fuel vapor generated from the wick 9 complete combustion by the main combustion air swirling into the combustion chamber 1 from the main combustion air inlet 11 and are discharged. If fuel vapor and flame that have not completed combustion stagnate, unburned carbon will accumulate, so auxiliary air is introduced into the auxiliary air introduction pipe 8.
The fuel is introduced into the cylindrical member from above to assist combustion within the cylindrical member 3, and at the same time allows uncombusted fuel to flow out into the combustion chamber 1 to prevent carbon deposition. Even if the condensed fuel vapor or liquid fuel directly flows into the auxiliary air passage 21 from the auxiliary air introduction pipe 8 through the passages 23 and 24, it is branched from the swirling air passage 18 by the partition wall 22. The auxiliary air passage 21 is branched at an upward slope from the swirling air passage 18 which directly communicates with the combustion air discharge port 17 at its lower end, so that it will not be blocked.

The advantages of the liquid fuel combustion device of the present invention having the above-mentioned structure are as follows: (1) The fuel vapor that is once evaporated within the cylindrical member flows into the auxiliary air passage and is condensed, or Even if the liquid fuel flows directly into the auxiliary air passage by blowing back, the auxiliary air passage is not blocked, and therefore the circulation of auxiliary air around the ignition plug 6 inside the cylindrical member 3 is guaranteed. There is no difficulty in starting combustion in the combustion device, no combustion failure, and no combustion interruption.

(2) An auxiliary air passage is formed in the housing 13 of the combustion air blower 12, and a discharge pipe 25 forming an auxiliary air discharge port is opened opposite the auxiliary air introduction pipe 8 of the cylindrical member 3, and is short. The flexible tube 26 can be connected to the auxiliary air introduction tube 8, and since the long flexible tube does not have to be detoured around the outer periphery of the combustion chamber, the configuration becomes compact and assembly work is simplified. Therefore, it is effective in reducing costs regardless of the number of parts.

etc.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the liquid fuel combustion apparatus of the present invention, Figure 2 is a view of the combustion air blower removed from the combustion chamber of Figure 1 and viewed from the direction of the arrow, and Figure 3 is a view of the liquid fuel combustion apparatus of the present invention. FIG. 4, which is a vertical cross-sectional view of the conventional example, is a view taken from the direction of the arrow with the combustion air blower removed from the combustion chamber of FIG. Explanation of symbols: 1... Combustion chamber, 2... Cylindrical wall body,
3... Cylindrical member, 4... Flange, 5... Heat exchange wall, 6... Ignition plug, 7... Liquid fuel introduction pipe, 8...
... Auxiliary air introduction pipe, 9 ... Wick core, 10 ... Upstream end wall of combustion chamber 1, 11 ... Main combustion air inlet, 12 ... Combustion air blower, 13 ... Combustion air blower casing body, 14... impeller, 16... electric motor, 17... discharge port, 18... swirling air passage,
21...Groove portion forming an auxiliary air passage, 22...
Partition wall, 23, 24... passage, 25... discharge pipe, 2
6...Flexible tube.

Claims (1)

[Scope of utility model registration request] An ignition plug 6 is disposed surrounded by a cylindrical member 3 that opens into the cylindrical wall 2 of the combustion chamber 1, and the cylindrical member 3 has a liquid fuel introduction pipe 7 and the cylindrical part around the ignition plug 6. An auxiliary air inlet pipe 8 is provided for assisting the combustion of fuel inside the member 3 and preventing adhesion of carbon particles, and a main combustion air inlet is provided in the end wall 10 on the upstream side of the combustion gas flow of the combustion chamber 1. 11 opens,
A groove 18 formed in the downstream end surface of the housing 13 of the combustion air blower 12 and the end wall 10 of the combustion chamber 1
and the discharge port 17 of the combustion air blower 12.
In a liquid fuel combustion device in which a swirling air passage 18 is formed that connects the main combustion air inlet 11 to the groove 21 that constitutes the auxiliary air passage.
is formed integrally with the swirling air passage 18 by branching from the swirling air passage 18 at an upward slope on the downstream end face of the housing 13 of the combustion air blower 12.