JPS6132566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a vaporizing element (wick) impregnated with liquid fuel.
This relates to a liquid fuel combustion device that performs combustion by applying air to the surface and vaporizing the liquid fuel from the vaporizing element, which ensures smooth and reliable ignition and extends the life of the ignition element. .

Conventionally, the number one complaint regarding general combustors has been ignition errors. In particular, the ignition heater for evaporative pot burners is mainly composed of a coil-type ignition element 32 and an auxiliary wick 33 that sucks up the fuel flowing into the bottom of the burner, as shown in Fig. 3, and the ignitability is also the same as before. Performance is improved compared to those that directly ignite the oil at the bottom of the burner with an ignition element. However, if the surface of the ignition element 32 and the auxiliary wick 33 come into close contact, or if the amount of air in the partial region of the ignition element 32 is extremely reduced due to external factors, the amount of vaporized gas will decrease even if the ignition element 32 is at or above the ignition temperature. If the amount increases, it will become a thick mixed gas and will not ignite. The wick corresponding to the vaporization element and the ignition wick are separated, and the configuration of the ignition wick and ignition coil length and the main wick are V.
Even if the ignition coil has a letter-shaped configuration, the arrangement and positional relationship of the ignition coil is not clearly defined, and in many cases, the constituent functions of the ignition coil, the ignition wick, and the primary air are not clearly defined. However, in the above configuration, not only is the ignition unstable and uncertain, but also the flame transfer from the ignition flame to the main wick is poor, resulting in incomplete combustion for a long time, which requires consideration from a practical standpoint. In particular, the former situation can occur frequently, and there has been no end to complaints in the market. The present invention solves these problems.

Hereinafter, the present invention will be described in detail with reference to the drawings. In Figures 1 and 2, 1 is a combustor main body with a rectangular cross section, inside which a plurality of primary air holes 3 are provided on the left and right peripheral walls via air chambers 2 separated on the left and right. The chamber 4 is connected to a secondary combustion chamber 7 in which a flame stabilizing plate 11 faces the primary air holes 5 of the second stage, narrowing the upper part of the center, and having a plurality of secondary air holes 6. It has a built-in combustor 8 consisting of. An oil chamber 10 equipped with an oil supply pipe 9 is connected to a lower intermediate portion of the combustor body 1, and a blow chamber body 13 consisting of a blow chamber 11a and an air supply port 12 is connected thereto. Furthermore, the oil chamber 10
A horizontally elongated vaporizing element 14 made of heat-resistant porous material is provided so as to face the primary combustion chamber 4 and the primary combustion chamber 4, and a holder 15 is provided at the bottom of the vaporizing element 14, and a holder 15 is mounted on the seat 10' of the oil chamber 10.
It is arranged and provided above. On the other hand, an ignition pipe 16 and an ignition heater body 17 are provided on the upper surface of the vaporization element 14 so as to face the central part from the side of the primary combustion chamber 4.
An electric ignition element 18 is arranged via the ignition element 18 . Note that the vaporizing element 14 is laterally longer than the ignition element 18. The relationship between the ignition element 18 and the upper part of the corresponding vaporization element 14 is designed to have a slight gap D. Furthermore, regardless of the amount of vaporization from the upper surface of the corresponding vaporizing element 14 due to the red heat of the ignition element 18 (for example, when the ignition element 18 and the upper surface of the vaporizing element 14 are in close contact), the ignition element 1
This prevents the vaporized mixed gas surrounding the 8th basin from becoming a rich excess gas below the explosive limit. That is, the upper surface of the vaporizing element 14, that is, a part of the surface corresponding to the ignition element 18 (according to experiments, 20 to 80% of the width of the ignition element 18, that is, the recess 19 is smaller than the width of the ignition element 18). By forming the concave portion 19 (which has a small width), it is possible to satisfy the above condition. In addition, 20%
If the amount is below, the amount of vaporization will be too large, and if it is over 80%, the amount of vaporization will be too small, resulting in poor ignitability. Furthermore, recessed part 1
The shape of 9 is determined by the amount of vaporized by the amount of heat received from the ignition element 18, and the primary air holes 3 arranged below the recess 19 on both sides thereof.
It has been found through experiments that a V-shaped shape is effective in keeping the relationship between the amount of air supplied and the amount of air supplied within the explosion limit under all conditions. Furthermore, it was confirmed that the V-shaped shape is appropriate considering the strength at both ends of the recess 19 and the processing aspects. Note that 20 is a damper that adjusts the amount of air sent from a blower (not shown), 21 is a plurality of vents, and 22
is a flame regulating plate, 23 is a part of the heat exchanger, A, B and C
are the primary flame and secondary flame formed in the primary and secondary combustion chambers 4 and 7. Reference numerals 24 and 25 indicate recesses that are displaced to correspond to the ignition element 18 when the ignition heater body 17 is displaced from side to side due to the design requirements of the combustor body 1 and equipment.

Next, to explain the operation, first, when liquid fuel is supplied into the oil chamber 10 through the fuel supply pipe 9 using a pump or a head, the fuel is sucked up from the bottom of the vaporizing element 14, and the entire upper surface is impregnated with fuel, making it stable. do. On the other hand, after the combustion air is adjusted to an appropriate amount for combustion according to the opening degree of the air supply port 12 and the damper 20 using a blower fan, chimney draft, etc. The air is supplied to the primary combustion chamber 4 and the secondary combustion chamber 7 via the primary air holes 3 and 5 and the secondary air hole 6, respectively. In this state, when the ignition element 18 is energized, the ignition element 18 is red-hot to a temperature higher than the ignition temperature of the liquid fuel 26, and the vaporization element 1 corresponding to the ignition element 18 receives the heat.
4. The recessed portion 19 on the top surface is heated. Then, vaporized gas is generated from this recessed portion 19, and a mixed gas of this vaporized gas and primary air supplied oppositely from the lower left and right surfaces of the V-shaped recessed portion 19 explodes the liquid fuel. It ignites only when it is within the limit and receives heat above the ignition temperature of the ignition element 18, forming the primary flame A. And this one
The heat of combustion is expanded by the secondary flame A, and as time passes, the primary flames A, B, and secondary flame C spread throughout the combustor, resulting in stable combustion. After stabilization, the combustion amount is adjusted by the damper 20. That is,
This is carried out according to the principle that the vapor pressure at the surface of the vaporizing element 14 is proportionally varied depending on the amount of air. On the other hand, for extinguishing, the supplied fuel 2 in the oil chamber 10
6, the oil-containing fuel in the vaporizing element 14 will be completely burned and the fire will be extinguished.

Next, the effects of this embodiment will be explained.

(1) Vaporization element 14 corresponding to dotting element 18
By forming the recess 19 on the top surface (specifically, making it V-shaped), the amount of vaporization that is vaporized by receiving the heat of the ignition element 18 can be reduced under all conditions (especially when the top surface of the ignition element 18 and the vaporization element 14 are in contact with each other). ), the amount does not increase significantly, and an appropriate amount is supplied toward the recess 19 from the primary air holes 3 disposed on the left and right sides below the V-shaped recess 19 while facing each other. Because the primary air was mixed in, the mixed gas generated here was located within the explosion limit and ignition was ensured.

(2) By making the width of the recess 19 smaller than the width of the ignition element 18, a gap is always maintained even when the ignition element 18 contacts the vaporization element 14, so that the heat of the ignition element 18 is transferred to the vaporization element 14. It is not directly taken away by an oil film on the top surface. Therefore, the surface temperature of the ignition element 18 does not drop suddenly, and there are no ignition errors or variations, especially under low temperature conditions. Moreover, the concave portion 19 partially becomes a mixing chamber for vaporized gas and air, making it possible to create a uniform gas mixture, and furthermore, as mentioned above, the temperature of the ignition element 18 directly above the concave portion does not drop. Therefore, the flame holding effect of the ignition flame is improved, and the ignitability can be further improved.

(3) Since the mixed gas concentration is always maintained within the explosive limit, it is difficult to create an annular atmosphere while the ignition element 18 is energized (for 3 to 5 minutes according to experiments). Therefore, when the ignition element 18 is of the electric heating coil type, hard carbon is not generated inside the coil. Therefore, the conventional problems of deterioration of ignitability and short circuit between coils due to accumulation of hard carbon are no longer present. Therefore, the life of this ignition element 18 has become extremely long and its reliability has become extremely high.

(4) Ignition element 18 in terms of actual changes over time
is deformed downward due to creep phenomenon, or tar is accumulated on the top surface of the vaporization element 14, resulting in the gap between the ignition element 18 and the top surface of the vaporization element 14,
Although the recess 19 gradually becomes smaller, since the recess 19 is provided, the ignition element 18 and the vaporizing element 14 will not come into contact with each other and the ignition reliability will not deteriorate.

(5) By forming the recess 19 on the upper surface of the vaporizing element 14 into a V-shape, machining is easy, and the additional machining of the recess 19 does not reduce the strength, so there is no problem in terms of functionality or manufacturing.

(6) Even if the ignition element 18 is misaligned due to design factors, the recess 19 can be freely accommodated by its width, so the effect of improving the ignition characteristics will not be impaired.

(7) Even if the ignition element 18 is shifted from side to side, it can be accommodated by the recesses 24 and 25 of the vaporizing element 14, and the ignition characteristics will not be impaired.

Next, the effects of this invention will be explained.

1 By forming a recess in the upper surface corresponding to the igniting element near the upper surface of the evaporating element, the amount of vaporized by receiving the heat of the ignition element can be reduced under all conditions (especially when the ignition element and the upper surface of the evaporating element come into contact) ) However, the amount did not become extremely large, and since air was mixed in through this concave portion, the mixed gas generated here was located within the explosion limit and ignition was ensured.

2 By making the width of the recess smaller than the width of the ignition element, a gap is always maintained even when the ignition element contacts the vaporization element, so that the heat of the ignition element is directly absorbed by the oil film on the top surface of the vaporization element. It won't happen. Therefore, the surface temperature of the ignition element does not drop suddenly, and there are no ignition errors or variations, especially under low temperature conditions. Moreover, the concave part becomes a mixing chamber for vaporized gas and air, making it possible to create a homogeneous mixed gas.Furthermore, as mentioned above, there is no temperature drop in the ignition element directly above the concave part, so the ignition flame is The flame holding effect is improved and the ignitability can be further improved.

3. Since the mixed gas concentration is always maintained within the explosive limit, it is difficult to create an ambient atmosphere while the ignition element is energized. Therefore, when the ignition element is of the electric heating coil type, hard carbon is not generated inside the coil. Therefore, the conventional problems of deterioration of ignitability and short circuit between coils due to accumulation of hard carbon are no longer present. Therefore, the life of this ignition element is extremely long and its reliability is extremely high.

4 Looking at actual changes over time, the ignition element deforms downward due to creep phenomenon, and tar builds up on the top surface of the vaporization element, so the gap between the ignition element and the top surface of the vaporization element gradually decreases, but the concave part Since the width of the ignition element is smaller than that of the ignition element as described above, the ignition element and the vaporization element will not come into contact with each other and the ignition reliability will not deteriorate.

Furthermore, due to the combination of the ignition element and the V-shaped recess provided across a part of the longitudinal direction of the vaporization element, in the process of ignition, the left and right parts of the ignition element are close to the vaporization element, so that the vaporized gas generation area or the center Since the parts are far apart, they become hot and act as ignition parts, and the vaporized gas is reliably ignited in this central high temperature part by their synergistic effect, and this action is always carried out reliably every time.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a liquid fuel combustion device according to an embodiment of the present invention, Fig. 2 is a partial sectional view taken along line -' in Fig. 1, and Fig. 3 is a conventional ignition heater of an evaporative pot burner. FIG. 1...Combustor main body, 2...Air chamber, 3...Primary air hole, 4...Primary combustion chamber, 5...Primary air hole,
6... Secondary air hole, 7... Secondary combustion chamber, 8... Combustor, 14... Vaporizing element, 17... Ignition heater body, 18... Ignition element, 19... Recessed portion.

Claims (1)

[Claims] 1 An oil chamber, a vaporization element serving as a main core to which fuel is supplied from this oil chamber, a primary combustion chamber facing this vaporization element, and a portion corresponding to the vicinity of the upper surface of the vaporization element in this primary combustion chamber. A V-shaped recess with a width smaller than the width of the ignition element is formed in at least a portion of the upper surface of the vaporizing element corresponding to the center of the ignition element; A liquid fuel combustion device, wherein primary air holes are provided on the left and right walls below the recess and on the left and right walls of the air chamber.