JPS63183305A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To cause a required amount of air corresponding to combustion to be supplied in a downstream direction and enable uniform combustion to be performed including at the end part of a wick by a method wherein flame holes to cause an amount air flowed to be gradually increased from the upstream side to the downstream side are provided at red heat portions at both side surfaces of a combustion cylinder. CONSTITUTION:Upon ignition of a wick 1, combustion is carried out with air supplied from a porous plate 4 and flame holes 7 of a rear porous plate 5 and a temperature of flame is increased and a normal combustion condition is attained. At this time, a part of the air flowing from the flame holes 7 is used as premixing air, and air flowing from flame holes 8 is added to complete the combustion. In turn, port diameters of the flame holes 9a-9n arranged at side surfaces 4b and 4c are set to be gradually increased from the upstream side to the downstream side in respect to the combustion at both end portions of a combustion chamber 3, so that at the upstream side the amount of air to be supplied is decreased and so a cooling by air can be suppress. Further, since the amount of air supplied toward the downstream side area can be gradually increased, the requisite air corresponding to the combustion can be supplied and a stable combustion state can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a liquid fuel combustion device in which a line-shaped wick is impregnated with liquid fuel and burned.

(Prior Art) A wick type oil combustor, known as a liquid fuel combustion device, has a combustion chamber formed by a cylindrical perforated plate having a large number of flame holes, and a linear combustion chamber provided at the bottom of the combustion chamber. The lamp wick is impregnated with petroleum, and the oil vapor evaporated from the wick is combusted inside the combustion chamber.

In such a wick-type oil combustor, the amount of flame is generally adjusted by adjusting the amount of wick exposure from a wick guide that supports the wick impregnated with petroleum.

However, in flat combustion type wick type oil combustors, the fire pan on which the cylindrical combustion tube is placed is linear, so heat is released from both ends of the fire pan, creating a temperature difference between the center and both ends. As a result, uniform evaporation cannot be obtained as a whole. As a result, there were problems in that the flame was biased toward the center, and the air supply was uneven, resulting in insufficient air in the center, resulting in incomplete combustion.

If the number of flame holes at the front of the combustion tube is increased in order to improve this problem, a flammable mixture region will be formed near the wick, and the flame near the wick will become flame-holding, resulting in a reduction in fuel evaporation. , the effect of adding flame holes is lost, and since a sufficient mixing pressure layer of fuel and air cannot be created, premixing with combustion air decreases, causing incomplete combustion. It also causes harmful gases such as Co and HC to be generated.In addition, if the tfN structure is used in which both sides of the combustion chamber are opened and air is introduced, both ends of the fire pan are cooled by the incoming air. In this case, the amount of fuel evaporation decreases, causing the flame to be biased toward the center.As you can see, when the flame is biased toward the center, the air supply becomes uneven, and there is a shortage of air in the center.
There is excess air at both ends, causing incomplete combustion.

(Problems to be Solved by the Invention) As mentioned above, the prior art has problems such as not being able to achieve uniform combustion and causing incomplete combustion.

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a liquid fuel combustion device that has a simple configuration, enables uniform combustion including the ends of the wick, and prevents incomplete combustion. shall be.

[Configuration of the Invention (Means and Effects for Solving Problems) The present invention comprises:
It has a combustion tube with a small-diameter flame hole in the lower part of the front and a large-diameter flame hole in the red-hot part above it, and burns with a linear wick exposed in the combustion chamber formed by the combustion tube. The liquid fuel combustion device is characterized in that flame holes are provided in the red-hot portions on both sides of the combustion tube so that the flow rate of air gradually increases from upstream to downstream.

With this configuration, the amount of air flowing in from both sides of the combustion tube is small in the upstream area and gradually increases toward the downstream area, so cooling by air is suppressed on the upstream side of the combustion area, reducing the amount of fuel evaporation. In addition, the necessary amount of air is supplied downstream according to the combustion, and uniform combustion is possible including the ends of the wick.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Fig. 1 shows an example of the configuration of a liquid fuel combustion device to which the present invention is applied. In Fig. 1, numeral 1 is a linear lamp wick housed in a fuel tank 2. It can move up and down, sucking up fuel from the fuel tank 2 and supplying it to the combustion cylinder 3. The combustion tube 3 has a front perforated plate 4 formed into a U-shape by bending both sides.
A cylindrical combustion chamber 6 is formed by arranging a front perforated plate 4 and a rear perforated plate 5 so as to sandwich the lamp wick 1 from the front to the rear.

A large number of small-diameter flame holes 7 are arranged below the front surface 4a and both side surfaces 4b, 4c of this front perforated plate 4, and flame holes 8 with a larger diameter than the flame holes 7 are provided in the red-hot area located above the front surface 4a. are installed in large numbers. Also, both sides 4b.

As shown in FIG. 2, a plurality of flame holes 9a to 9n are arranged in the red-hot part located above 4c, the diameters of which are set such that the opening area density gradually increases from upstream to downstream.

A duct 10 serving as a passage for supplying air into the combustion chamber 6 is disposed outside the combustion tube 3 described above, and a glass or the like is installed at the front of the duct 10 to radiate radiant heat from the red-hot part of the front perforated plate 4. A transparent body 11 is provided.

In the liquid fuel combustion device configured as above, when the lamp wick 1 is ignited by an ignition device (not shown), it is combusted by the air supplied from the flame holes 7 of the front perforated plate 4 and the rear perforated plate 5, and the temperature rises to a steady state. becomes a state of combustion. At this time, flame hole 7
A part of the air flowing in from the flame hole 8 is used as premixed air, and the air flowing in from the flame hole 8 is added to complete combustion.

On the other hand, for combustion at both ends of the combustion chamber 3, the side surfaces 4b,
Since the diameters of the flame holes 9a to 9n provided in the flame holes 4c are set to gradually increase from upstream to downstream,
In the upstream area, the amount of air supplied is reduced, and cooling by air can be suppressed. Moreover, since the amount of air supplied can be gradually increased toward the downstream region, the necessary and appropriate amount of air can be supplied according to combustion.

Therefore, with this configuration, the amount of fuel evaporation at both ends will not be reduced due to excess air, the heat input to the lamp wick 1 will be stabilized, uniform evaporation will be obtained throughout the lamp wick, and the amount of fuel necessary for combustion will be stabilized. Since air can be supplied appropriately, stable combustion conditions can be obtained. For this reason,
The combustion near both ends of the lamp wick 1 is also improved, making it possible to obtain uniform combustion over the entire combustion area, making it possible to capture a wide range of radiant heat, as well as stabilizing the flame and eliminating harmful combustion intermediate products such as Co and HC. Occurrence can be prevented.

Note that this invention is not limited to the above-mentioned embodiment, and can be implemented with various modifications without changing the gist.For example, in the above-mentioned embodiment, the opening area density is We installed multiple flame holes with diameters that gradually become larger toward the downstream.
It is also possible to provide a single triangular flame hole that widens downstream. Further, in the above embodiment, the lamp wick is linear, but it may be arc-shaped, for example, as long as it has a linear shape with an end.

[Effects of the Invention] According to the present invention, a simple configuration can be achieved by providing flame holes in which the amount of air ventilation gradually increases from upstream to downstream in the red hot parts on both sides of the combustion tube forming the combustion chamber. It is possible to provide a liquid fuel combustion device that enables uniform combustion including the ends of the wick and prevents incomplete combustion.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, and FIG.
The figure is a plan view showing an enlarged main part of the same embodiment.

Claims (1)

[Claims] It has a combustion tube with a small-diameter flame hole in the lower part of the front and a large-diameter flame hole in the red-hot part above it, and burns with a linear wick exposed in the combustion chamber formed by the combustion tube. A liquid fuel combustion device characterized in that flame holes are provided in red-hot parts on both sides of the combustion tube, the amount of air passing through the combustion tube gradually increasing from upstream to downstream.