JPH08135926A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE: To improve the heat resistance of a vaporizer cylinder to maintain a stable vaporizing performance for a long period of time even when a liquid fuel with a high evaporation temperature is used. CONSTITUTION: A liquid fuel combustion device is provided with a burner case 9, a vaporizer cylinder 1 that is contained in the burner case 2 and vaporizes liquid fuel supplied from a liquid fuel feeder 12, a burner head 20 that has two or more burner ports 21 in its peripheral wall 20B and is mounted on an upper opening of the vaporizer cylinder 1, and a fan to supply combustion air into the vaporizer cylinder 1. Therefore, the lower part of the vaporizer cylinder 1 is made of a heat-resistant aluminum alloy that can be heated up to at least 270 deg.C and two or more heat recovery protrusions 29 are provided at the upper end of the vaporizer cylinder 1 as integral parts of it, facing the peripheral wall 20B of the burner head 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petroleum vaporization type liquid fuel combustion apparatus mainly used for oil fan heaters and the like.

[0002]

2. Description of the Related Art Generally, a liquid fuel combustion apparatus of this type has a bottomed cylindrical burner case in which a vaporization cylinder having an electric heater is housed. A peripheral wall portion is provided at an upper end opening of the vaporization cylinder. A burner head having a plurality of flame holes is attached to. Then, the liquid fuel and the primary air for combustion are supplied to the inside of the vaporization cylinder to vaporize the liquid fuel and mix it with the air, and the mixed gas is sent to the burner head and ejected from each flame hole in the peripheral wall portion of the burner head. The ignition rod spark is used to ignite and burn. Further, the vaporization cylinder is heated by energizing the electric heater embedded in the peripheral wall of the vaporization cylinder at the start of operation, and is heated by the flame formed in the flame hole of the burner head after the combustion is started. When 1 to 5 minutes have passed, the power supply to the electric heater is stopped. In this way, even if the power supply to the electric heater is stopped, the vaporization cylinder is maintained at a temperature of about 240 to 260 ° C. by the heat of the flame, the liquid fuel is continuously vaporized, and the combustion is continued.

[0003]

However, in the above-described conventional liquid fuel combustion apparatus, the vaporization cylinder temperature is maintained at about 240 to 260 ° C., and therefore it is commercially available in Japan. When unmodified JIS No. 1 kerosene is used, there is no problem such as tar remaining inside the vaporization cylinder, but for example, J modified after long-term storage
When IS1 kerosene is used, or when liquid fuel having a higher evaporation temperature than JIS1 kerosene is used, tar remains inside the vaporization cylinder and vaporization performance deteriorates, making stable vaporization combustion impossible. There was a problem.

Therefore, in order to prevent the tar from remaining inside the vaporization tube, the temperature of the vaporization tube may be raised. In that case, the conventional vaporization tube has Al--Si type or Al--Mg type, or Since it is made of an Al-Si-Cu type aluminum alloy, the heat resistance was not so high and there was a concern that it might deform.

The present invention has been made in view of the above-mentioned facts, and it is possible to improve the heat resistance of a vaporizing cylinder and maintain stable vaporization performance for a long period of time even when a liquid fuel having a high evaporation temperature is used. The purpose is to do so.

[0006]

According to the present invention, a burner case, a vaporization cylinder which is housed in the burner case and which vaporizes the liquid fuel supplied by the liquid fuel supply means, and a plurality of flame holes are formed in the peripheral wall portion. And a blower for supplying combustion air to the inside of the vaporization cylinder, the vaporization cylinder having a lower portion 27
It is made of a heat-resistant aluminum alloy that can be heated to 0 ° C. or more, and has a structure in which a plurality of heat recovery projections facing the peripheral wall of the burner head are integrally provided at the upper end thereof.

In the liquid fuel combustion apparatus according to the second aspect of the present invention, the discharge portion of the ignition rod faces the lateral side of the heat recovery projection.

In the liquid fuel combustion apparatus according to the third aspect of the present invention, the blower supplies the primary air for combustion into the inside of the vaporizing tube and the secondary air for combustion into the space between the burner case and the vaporizing tube. This is the configuration.

In the liquid fuel combustion apparatus according to the fourth aspect, the outlet of the secondary air supply pipe is located on the peripheral wall of the burner case, and the outlet is provided near the outlet of the secondary air supply pipe. This is a configuration in which a blower guide having facing surface portions facing each other at a predetermined interval is provided.

[0010]

As described above, since the lower part of the vaporizing cylinder is made of a heat-resistant aluminum alloy capable of being heated to 270 ° C. or higher, even if the vaporizing cylinder is heated to a higher temperature than before, thermal deformation such as swelling or melting will occur. There is no need to worry. Further, since a plurality of heat recovery projections facing the peripheral wall of the burner head are integrally provided at the upper end of the vaporization cylinder, the plurality of heat recovery projections are burned in the high temperature part of the flame during combustion. The heat of the heated heat recovery projection is transferred to the lower part of the vaporization tube,
The lower part of the vaporization cylinder can be heated to a high temperature of approximately 270 ° C or higher, so that even if deteriorated defective kerosene or liquid fuel with a high evaporation temperature is used, it is possible to suppress tar from remaining inside the vaporization cylinder, and for a long period of time. A good vaporization state is maintained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings of FIGS. In the figure, 1 is a bottomed cylindrical vaporization cylinder made of die-cast with an open top, and this vaporization cylinder 1 is made of an Al—Mn-based heat-resistant aluminum alloy. An air introduction port 2 that is opened in the tangential direction of the peripheral wall portion is provided in part. The heat-resistant Al alloy used as the material of the vaporization cylinder 1 is A
l as a main component, in addition to Mn, Si, Fe, Ni, Ti,
Cu, Mg, etc. are contained, and Mn is 2.5 to 6.0% by weight.
And other than Al have the highest content.

Reference numeral 3 denotes an electric heater such as a sheathed heater embedded in the upper part of the peripheral wall of the vaporization cylinder 1, and 4 denotes a primary air cylinder whose one end is connected to the air inlet 2 of the vaporization cylinder 1. The primary air cylinder 4 Is connected at its other end to the casing 8 of the blower 7 containing the air supply fan 6 driven by the motor 5, and the primary air for combustion from the blower 7 is introduced into the vaporization cylinder 1 through the air introduction port 2. It is something to send. 9 is a vaporization cylinder 1
A bottomed cylindrical burner case 10 is provided on the outer periphery of the secondary air pipe 10 for feeding secondary air for combustion into the space X between the burner case 9 and the vaporization cylinder 1. 10A of the tip end of the secondary air pipe 10 penetrates the peripheral wall portion 9A of the burner case 9 to face the inside of the burner case 9 and is opened near the peripheral wall portion 9A. Similarly to the primary air cylinder 4, it is connected to the casing 8 of the blower 7.

Reference numeral 11 denotes a tip outlet portion 1 of the secondary air pipe 10.
It is a blower guide made of a metal plate attached to the inner surface of the peripheral wall portion 9A of the burner case 9 so as to cover 0A.
1 is about 5 to 1 with the tip outlet portion 10A of the secondary air pipe 10.
Has a facing surface portion 11A facing each other with a space of 0 mm,
Although only one side surface is opened in a state where it is attached to the inner surface of the peripheral wall portion 9A of the burner case 9, it is also possible to open both left and right side surfaces.

An injection needle-shaped fuel nozzle 12 is arranged concentrically with the air inlet 2 and the primary air cylinder 4 at one end thereof.
Liquid fuel such as kerosene is jetted into the vaporization cylinder 1 with 2A facing the interior of the vaporization cylinder 1, and the other end is a fuel supply pipe 13
And the inside of the fuel tank 15 through the fuel pump 14 such as an electromagnetic pump. Reference numeral 16 denotes a detachable cartridge tank for supplying liquid fuel to the fuel tank 15.

Reference numeral 17 denotes a die-cast diaphragm plate fitted and mounted in the upper opening of the vaporizing cylinder 1. The diaphragm plate 17 has the same heat resistance as the vaporizing cylinder 1, and is made of Al--Mn heat-resistant Al.
It is made of an alloy, and a cylindrical portion 17A that forms the throttle passage 18 is integrally formed in the center of the diaphragm plate 17 so as to be integrally formed. Reference numeral 19 denotes a disk-shaped baffle plate disposed immediately below the cylindrical portion 17A of the diaphragm plate 17, and is spaced apart from the cylindrical portion 17A.

Reference numeral 20 denotes a ceiling-shaped cylindrical burner head mounted on the upper part of the vaporization cylinder 1.
Is a top plate 20 made by drawing a heat-resistant stainless steel plate.
A and the peripheral wall portion 20B are integrally formed, and a large number of flame holes 21, 2 for ejecting a mixed gas are formed on the peripheral wall portion 20B.
1 is provided. In addition, the plurality of flame holes 21, 21
Is divided into upper and lower three stages, and the peripheral wall portion 20 of the burner head 20 is divided.
It is provided in B. Further, 22 and 22 are flame hole wire nets provided in close contact with both inner and outer surfaces of the peripheral wall portion 20B of the burner head 20.

Reference numeral 23 denotes a mixed rectifying cylinder arranged in the burner head 20 so as to cover the throttle passage 18 of the diaphragm plate 17 from above, and the mixed rectifying cylinder 23 is drawn from the side surface by drawing a heat-resistant stainless steel plate. It is formed in a substantially convex shape when viewed. The mixed rectifying cylinder 23 has a large number of diameters set to about 2 mm on the ceiling surface of the heavenly cylindrical portion 23A provided at the center thereof and the annular flat surface portion 23B provided on the lower periphery. Small holes 24, 24, 25, 25 are provided, and the peripheral wall portion of the heavenly cylindrical portion 23A is a non-perforated wall.

A heavenly cylindrical portion 23A of the mixing rectifying cylinder 23.
Is larger than the diameter of the throttle passage 18 of the throttle plate 17, and its height is formed to be substantially the same as that of the upper flame hole 21 of the burner head 20, and the height of the annular flat surface portion 23B is the same as that of the burner head 20. It is formed lower than the lower flame hole 21. The diaphragm plate 17, the burner head 20, and the mixing rectification cylinder 23 are fixed to the vaporization cylinder 1 by a plurality of mounting screws 26.

Reference numeral 27 denotes a combustion ring arranged on the outer periphery of the burner head 20. The combustion ring 27 is made of a heat-resistant stainless steel plate, and is mounted on the upper end of the vaporization cylinder 1 with a screw (not shown). It's stopped. The annular wall 27A of the combustion ring 27 facing the peripheral wall portion 20B of the burner head 20 is provided with a plurality of vertical slits 28, 28 at predetermined intervals in the circumferential direction.

Reference numerals 29 and 29 denote a plurality of heat recovery projections integrally formed on the upper end of the peripheral wall of the vaporization cylinder 1 so as to face the peripheral wall 20B of the burner head 20. As shown in FIG. 5, each of the protrusions 29, 29 is formed in a cylindrical shape, has a diameter T of about 6 to 8 mm and a height H of about 8 to 10 mm, and has an annular vaporization cylinder. Approximately 25 to 35, which are substantially equal to each other in the circumferential direction of the upper end of 1.
It is provided with a space S of mm so that heat can be efficiently recovered in the vaporization cylinder 1, and the plurality of heat recovery projections 29, 29 are integrally formed on the upper end of the vaporization cylinder 1 to achieve combustion. At this time, the upper part of the vaporization cylinder 1 is heated to 450 ° C. or higher, and the lower part thereof is heated to a temperature of about 270 ° C. to 330 ° C.

Reference numeral 30 is a frame rod for detecting the presence or absence of the flame F formed in the flame hole 21 of the burner head 20 and detecting the oxygen concentration, and 31 is an ignition rod for igniting the mixed gas ejected from the flame hole 21, This ignition rod 31
As shown in FIG. 3 and FIG. 4, the tip end discharge part 31A of the tip side of this heat recovery protrusion is located beside one of the heat recovery protrusions 29, 29 described above. Part 29 and about 2
The sparks of the discharge part 31A are made to fly toward the heat recovery projection 29 as shown in FIG. In FIG. 1, 32 is a combustion cylinder, and 33 is a filter provided at the combustion air inlet 34.

In the above structure, when the vaporization cylinder 1 rises above the vaporizable temperature of the liquid fuel due to the energization of the electric heater 3, the blower 7 and the fuel pump 14 are operated, and the fuel nozzle 12 via the fuel supply pipe 13. The liquid fuel is supplied to the inside of the vaporization cylinder 1 from the air introduction port 2 via the primary air cylinder 4, and the combustion primary air is supplied to the inside of the vaporization cylinder 1 from the air introduction port 2.

Here, the fuel supplied to the inside of the vaporization cylinder 1 is contacted with the inner wall surface of the vaporization cylinder 1 and vaporized, and this vaporized gas is mixed with primary air to form a mixed gas, which is a throttle plate. It flows into the mixing straightening cylinder 23 through the throttle passage 17 of 17. A part of the mixed gas that has flowed into the mixing rectifying cylinder 23 is a large number of small holes 25,
5 toward the lower stage flame hole 21 and the middle stage flame hole 21 and jets from each of these flame holes 21, 21 and the rest rises in the heavenly cylindrical portion 23A, and the heavenly cylindrical portion In 23A, the mixture is promoted toward the top surface portion and passes through a large number of small holes 24, 24 in the top surface portion. The mixed gas that has passed through these small holes 24, 24 is converted into the top plate portion 20 of the burner head 20.
It flows along the lower surface of A, goes toward each upper flame hole 21 and each middle flame hole 21, and ejects from these flame holes 21. In this way, the mixed gas ejected from each flame hole 21 is ignited by the sparks flying from the tip discharge portion 31A of the ignition rod 31 toward the heat recovery projection 29, forming the flame F and starting the combustion.

On the other hand, the combustion secondary air sent into the burner case 9 through the secondary air pipe 10 flows out from the tip outlet 10A of the secondary air pipe 10 into the blower guide 11, and this blown air is sent. The air is blown sideways by the guide 11, flows out from the open surface of the blower guide 11 into the space X between the vaporization cylinder 1 and the burner case 9, rises in this space X, and the upper part of the vaporization cylinder 1 and the burner case 9 are lifted. Through the gap between the top of
The secondary combustion of the flame F is promoted by being supplied to the outer periphery of the flame F.

After the combustion is started in this way, the heat of the flame F is transferred from the heat recovery projection 29 and the combustion ring 27 to the vaporizing cylinder 1.
Even if electricity is conducted to the electric heater 3, the vaporization cylinder 1 is maintained at a high temperature of about 280 to 330 ° C., so that the liquid fuel continues to vaporize and burns. Will be continued.

According to this embodiment, since the vaporization cylinder 1 made of die casting for vaporizing the liquid fuel is made of Al-Mn heat-resistant Al alloy, it is contained in an amount of 2.5 to 6.0% by weight. Since Mn functions to enhance mechanical properties such as heat resistance and strength of Al, the vaporization cylinder 1 is heated to a higher temperature than before (27 at the bottom).
Even if it is heated to 0 ° C. or higher and 450 ° C. or higher in the upper part, thermal deformation such as swelling or melting can be prevented.

A plurality of heat recovery projections 29, 29 facing the peripheral wall portion 20B of the burner head 20 having a plurality of flame holes 21, 21 are integrally formed at the upper end of the peripheral wall portion of the vaporization cylinder 1. Therefore, at the time of combustion, the plurality of heat recovery protrusions 29, 29 are roasted and heated by the high temperature portion of the flame F,
The heat of the heated heat recovery projections 29 is transmitted to the vaporization section of the vaporization tube 1 and the lower part of the vaporization section can be heated to a high temperature of about 270 ° C. to 330 ° C. Therefore, the deteriorated defective kerosene or the evaporation temperature is high. Even when liquid fuel is used, it is possible to prevent tar from remaining inside the vaporization cylinder 1, maintain a good vaporization state for a long time, and continue stable vaporization combustion. Here, if the liquid fuel supplied to the inside of the vaporization cylinder 1 has a distillation property close to that of light oil that requires a temperature of about 350 ° C. to evaporate 100%, the lower part of the vaporization cylinder 1 is 350 ° C. to 40 ° C.
By heating to a high temperature of 0 ° C., it is possible to suppress the tar from remaining inside the vaporization cylinder 1.

Further, the tip discharge portion 31A of the ignition rod 31
Are located opposite to the heat recovery protrusions 29 with a distance V of about 2 to 3 mm from the heat recovery protrusions 29.
Since the sparks from the discharge part 31A are blown toward the heat recovery projection 29, the sparks from the discharge part 31A to the heat recovery projection 29 are mixed gas ejected from the flame holes 21 as shown in FIG. It will always cross the stream, allowing the spark to make extensive contact with the mixed gas stream. Therefore, the spark has a high probability of contact with a portion having a high gas concentration in the mixed gas, and it is possible to reliably ignite in a short time, without causing an ignition mistake or taking too long time to ignite, Ignition performance can be improved.

The blower 8 supplies the primary air for combustion into the vaporization cylinder 1 through the primary air cylinder 4, and the space X between the burner case 9 and the vaporization cylinder 1 through the secondary air pipe 10. It is configured to supply secondary air for combustion to.
In this way, when the primary air for combustion supplied to the inside of the vaporization cylinder 1 and the secondary air for combustion supplied to the outer peripheral portion of the flame F are obtained from the same blower 7, the secondary air for combustion is heated. Compared with the liquid fuel combustion device which is obtained by a part of the blower of the blower for use in air (not shown), the generation of CO is reduced.

That is, in the liquid fuel combustion apparatus in which the secondary air for combustion is obtained by a part of the blow of the blower for warm air (not shown), the filter part of the blower for warm air (not shown) is cotton. When it is clogged with dust or the like, CO is liable to be generated due to lack of secondary air, but the flame F remains a blue flame unless the filter that takes in the primary air for combustion is clogged, and the frame rod 30 Does not detect abnormal combustion,
The combustion state in which CO is likely to occur is continued.

However, in the configuration in which the primary air for combustion and the secondary air for combustion are supplied by the common blower 8 as in this embodiment, the filter portion of the blower for warm air (not shown) is cotton. When it is clogged with dust or the like, the blowing capacity of the warm air blower is reduced, but the combustion state in which CO is likely to occur due to insufficient secondary air does not occur. The secondary air shortage is
This is a case where the filter 33 provided at the combustion air inlet 34 is clogged with dust or the like, and in that case, the primary air for combustion supplied to the inside of the vaporization cylinder 1 is also insufficient, and the flame is generated due to this insufficient primary air. The mixed gas ejected from the holes 21 becomes excessive fuel, the flame F becomes a red flame, the flame rod 30 senses abnormal combustion, and the combustion is stopped before a large amount of CO is generated, which is safe.

Further, the outlet 10A of the secondary air supply pipe 10 for supplying the secondary air for combustion from the blower 7 into the burner case 9 is located on the peripheral wall 9A of the burner case 9, and the outlet 10A is provided. Since the blower case 11 having the facing surface portion 11A facing the outlet portion 10A at a distance of about 5 to 10 mm is provided in the burner case 9 near 10A,
The secondary air for combustion that flows out from the outlet 10A of the secondary air supply pipe 10 can be made into a lateral flow along the facing surface portion 11A, and the cold secondary air for combustion that flows out from the outlet 10A is It does not flow directly toward the lower portion of the peripheral wall of the vaporization cylinder 10 that serves as the vaporization section. Therefore, the cooling of the vaporization cylinder 10 by the secondary air for combustion is suppressed, and the temperature of the vaporization cylinder 10 can be prevented from lowering.

[0033]

As described above, according to the liquid fuel combustion apparatus of the present invention, the vaporization cylinder is made of a heat-resistant aluminum alloy whose lower portion can be heated to 270 ° C. or higher. Heat resistance can be improved so that thermal deformation such as swelling and melting does not occur even when heated to a higher temperature than that, and moreover, the upper end of the vaporization cylinder has a plurality of heat recovery protrusions facing the peripheral wall of the burner head. Since the parts are integrated, it is possible to raise the temperature of the vaporization cylinder to a higher temperature than before, and tar remains inside the vaporization cylinder even when deteriorated defective kerosene or liquid fuel with a high evaporation temperature is used. Can be suppressed, a good vaporized state can be maintained for a long period of time, and stable vaporized combustion can be continued.

In the liquid fuel combustion apparatus according to the second aspect of the present invention, the discharge portion of the ignition rod is made to face the lateral side of the heat recovery projection, so that the ignition can be reliably performed in a short time, and the ignition can be performed. Ignition performance can be improved without making mistakes or taking too long to ignite.

In the liquid fuel combustion apparatus according to the third aspect of the present invention, the blower supplies the primary air for combustion into the inside of the vaporizing tube and the secondary air for combustion into the space between the burner case and the vaporizing tube. By doing so, the danger due to the generation of CO can be avoided as compared with the liquid fuel combustion apparatus in which the secondary air for combustion is obtained by a part of the blow of the warm air blower.

In the liquid fuel combustion apparatus according to the fourth aspect, the outlet of the secondary air supply pipe is located on the peripheral wall of the burner case, and the outlet is provided near the outlet of the secondary air supply pipe. By providing the air guides having the facing surface portions facing each other at a predetermined interval, the secondary air for combustion at room temperature flowing out from the outlet of the secondary air supply pipe directly flows toward the peripheral wall of the vaporizing cylinder. Therefore, the cooling of the vaporization cylinder by the secondary air for combustion is suppressed, and the temperature of the vaporization cylinder can be prevented from lowering.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the overall configuration of a liquid fuel combustion device showing an embodiment of the present invention.

FIG. 2 is likewise an enlarged cross-sectional view of a main part.

FIG. 3 is a plan view of the same main part.

FIG. 4 is an enlarged plan view of an essential part of FIG.

FIG. 5 is a perspective view of the vaporizer tube alone.

FIG. 6 is a perspective view of the burner case with a blower guide attached thereto.

FIG. 7 is a perspective view of the blower guide alone.

[Explanation of symbols]

 1 Vaporizer 7 Blower 9 Burner case 9A Peripheral wall part of burner case 10 Secondary air supply pipe 10A Outlet part 11 Blower guide 11A Opposing surface part 12 Fuel nozzle (fuel supply means) 20 Burner head 20B Peripheral wall part 21 of burner head 21 Flame hole 29 Heat recovery protrusion 31 Ignition rod 31A Discharge unit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Noboru Takahashi 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Yoichi Uchida 2-chome, Keihan-hondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A burner case, a vaporization cylinder which is housed in the burner case and which vaporizes the liquid fuel supplied by the liquid fuel supply means, and a peripheral wall portion having a plurality of flame holes, and the upper end of the vaporization cylinder. A burner head attached to the opening and a blower for supplying combustion air to the inside of the vaporization cylinder are provided, and the vaporization cylinder is made of a heat-resistant aluminum alloy capable of heating the lower portion to 270 ° C. or higher, Further, the liquid fuel combustion apparatus is characterized in that a plurality of heat recovery projections facing the peripheral wall of the burner head are integrally provided at the upper end thereof. 2. The liquid fuel combustion apparatus according to claim 1, wherein a discharge portion of the ignition rod is made to face a side portion of the heat recovery protrusion. 3. The blower supplies primary combustion air to the interior of the vaporization cylinder, and secondary combustion air to the space between the burner case and the vaporization cylinder. 1. The liquid fuel combustion device according to 1. 4. The outlet of the secondary air supply pipe is located on the peripheral wall of the burner case, and is opposed to the outlet of the secondary air supply pipe near the outlet at a predetermined distance. The liquid fuel combustion apparatus according to claim 3, further comprising a blower guide having a surface portion.