JP2957888B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporized liquid fuel combustion device used for an oil fan heater or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a burner head 3 is mounted on an upper end opening of a bottomed cylindrical vaporizer 2 having an electric heater 1 as shown in FIG. A throttle plate 6 provided with a cylindrical tube portion 5 forming a throttle passage 4 is disposed in the vaporization cylinder 2 below the throttle plate 3.
A disc-shaped baffle plate 8 is integrally provided below the cylindrical portion 5 via a connecting piece 7 so that unvaporized fuel does not enter the throttle passage 4 (for example, Japanese Utility Model Publication No. 2-9224). reference). Reference numeral 9 denotes an air inlet provided in a lower portion of the peripheral wall of the vaporizing cylinder 2, and the air introducing port 9 opens in a tangential direction of the peripheral wall of the vaporizing cylinder 2. Reference numeral 10 denotes an air supply pipe connected to the air introduction port 9, reference numeral 11 denotes a blower connected to the other end of the air supply pipe 10, 1
Reference numeral 2 denotes a fuel nozzle whose front end faces the inside of the vaporizing cylinder 2 through the air inlet 9.
3 and a fuel pump 14 to communicate with a fuel tank 15.

[0003] The operation of the liquid fuel combustion apparatus configured as described above will be described below. The liquid fuel in the fuel tank 15 pumped by the fuel pump 14 is sent to the fuel nozzle 12 via the oil feed pipe 13 and is ejected from the fuel nozzle 12 into the vaporization cylinder 2. The ejected fuel is vaporized on the inner wall of the vaporizing cylinder 2 heated to a high temperature by the electric heater 1, and premixed with the combustion air sent into the vaporizing cylinder 2 through the air inlet 9 by the blower 11. This mixed gas is supplied to the throttle passage 4 and the burner head 3.
The burner head 3 enters the burner head 3 through the small holes 16 in the bottom wall, and is ejected from the flame holes 17 provided in the peripheral wall thereof, and is ignited by the spark of the ignition rod 18 to start combustion.

[0004]

By the way, in the case where the air inlet 9 is provided in a part of the peripheral wall of the vaporizing cylinder 2, the combustion air sent into the vaporizing cylinder 2 from the air introducing port 9 is not used. When it reaches a position distant from the air inlet 9, it flows toward the cylindrical portion 5 of the throttle plate 6 and flows into the cylindrical portion 5. Therefore, as in the liquid fuel combustion device having the above configuration, the cylindrical portion 5 of the throttle plate 6 and the baffle plate 8
6 is the same on the air inlet 9 side and on the opposite side, the amount of combustion air flowing into the cylindrical portion 5 is smaller on the air inlet 9 side as shown by arrows A and B in FIG. Therefore, the air flow in the throttle passage 4 and the burner head 3 is deviated or uneven, and as a result, the burner head 3 is formed in one of the flame holes 17 in the circumferential direction. This causes a lifting phenomenon, and the flame formed in the flame hole 17 on the opposite side thereof has a problem of burning red fire.

The present invention has been made in view of the above-mentioned circumstances, and aims at equalizing the amount of air flowing toward each of the flame holes, and performing lifting combustion or red fire over the entire circumferential direction of the burner head. It is an object of the present invention to perform stable and good combustion without generating combustion.

[0006]

According to the present invention, there is provided a vaporizer having a burner head provided on an upper portion thereof, an air inlet and a fuel nozzle provided on a peripheral wall thereof, and a vaporizer provided below the burner head. A throttle plate provided with a cylindrical portion forming a throttle passage substantially at the center thereof, and a throttle plate provided below the cylindrical portion of the throttle plate with an interval therebetween and arranged at a position higher than the air inlet. And a gap between the cylindrical portion of the throttle plate and the baffle plate is formed such that the air inlet side is wide and the opposite side is narrow.

Further, according to the present invention, a burner head is provided at an upper portion, and an air inlet and a fuel nozzle are provided at a peripheral wall portion.
A throttle plate provided with a cylindrical portion forming a throttle passage substantially at the center thereof, and a throttle plate provided below the cylindrical portion of the throttle plate with an interval therebetween and arranged at a position higher than the air inlet. The gap between the cylindrical portion of the throttle plate and the baffle plate is formed such that the air inlet side is wider and the opposite side of the air inlet is narrower, and the baffle plate is located at the center of the center. The position is shifted to the air inlet side with respect to the center of the cylindrical portion.

[0008]

As described above, since the space between the cylindrical portion of the throttle plate and the baffle plate is formed to be wide on the air inlet side and narrow on the opposite side of the air inlet, the amount of combustion air flowing into the cylindrical portion is reduced. Means that the air inlet side is larger than before, and the opposite side of the air inlet is smaller than before,
The amount of air flowing in the throttle passage and the burner head can be prevented from being deviated or varied, and a mixed gas of the same amount of air can be blown out from each flame hole of the burner head, thereby preventing lifting combustion and red fire combustion. At the same time, a uniform and favorable stable combustion flame can be formed over the entire circumference of the burner head.

Further, in the liquid fuel combustion apparatus according to the second aspect, since the center position of the baffle plate is shifted toward the air introduction port with respect to the center of the cylindrical portion of the throttle plate, the position above the injection port at the tip of the fuel nozzle. Even if the baffle is covered with the baffle and the distance between the baffle and the cylinder on the air inlet side is widened, the fuel ejected from the fuel nozzle flows directly into the cylinder and flows into the burner head in an unvaporized state. Can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawing, reference numeral 20 denotes a blower for supplying air for combustion. The blower 20 includes a motor 21, a synthetic resin blower 22 driven by the motor 21, and a blower case 23 for accommodating the blower 22. And a synthetic resin support stand / motor case 24 mounted and fixed on the bottom plate 61 of the exterior case.
Supported by.

Reference numeral 25 denotes a heavenly cylindrical portion which is provided standing substantially at the center of the upper surface of the blower case 23. The cylindrical portion 25 has an opening 26 at the center of the top surface thereof.
A plurality of secondary air holes 27 are annularly arranged on the outer periphery of the opening 26. Reference numeral 28 denotes an air distribution plate provided at an upper portion in the air blow case 23.
Are provided with a plurality of vent holes 29, 29 in an annular shape.

Reference numeral 30 denotes a rotation speed detector for detecting the rotation speed of the blower fan 22, and 31 denotes a vaporization burner. The vaporization burner 31 is an upper end of a bottomed cylindrical vaporization cylinder 32 for vaporizing liquid fuel (kerosene). In the opening, a plurality of flame holes 33, 3 in the peripheral wall
3, a burner head 35 having a plurality of small holes 34, 34 is mounted on the bottom wall, and a throttle plate 36 is disposed in the vaporizing cylinder 32 below the burner head 35. Reference numeral 37 denotes a burner ring disposed on the outer peripheral portion of the burner head 35. A plurality of vertical slits 38, 38 are provided in the upper portion of the burner ring 37 to form a skewer.

The vaporizing cylinder 32 is made of aluminum die-casting, and has an air inlet 39 formed in the lower part of the peripheral wall in the tangential direction of the peripheral wall, and the upper part of the cylindrical part 25 is formed in the upper part of the peripheral wall. An annular flange 40 mounted on the top surface is formed, and an electric heater 41 for vaporization such as a sheath heater is embedded in the flange 40. And this vaporization cylinder 32
The lower part of the peripheral wall where the air inlet 39 is formed is
6, the combustion air sent into the cylindrical portion 25 from the blower 20 is supplied as primary air through the air inlet 39 by being inserted into the cylindrical portion 25.

Reference numeral 42 denotes a fuel nozzle for supplying liquid fuel (kerosene) into the vaporizing cylinder 32.
Is disposed concentrically with the inside of the air introduction port 39, and the outlet 43 at the tip thereof faces the inside of the vaporization cylinder 32. The fuel nozzle 42 has an oil supply pipe 44 at the other end.
Is connected to the inside of the fuel tank 46 via the oil feed pipe 44 and the fuel pump 45. 47 is a cartridge tank for replenishing the fuel tank 46 with fuel.

Next, the aperture plate 36 will be described in detail. The diaphragm plate 36 is formed integrally with a circular cylindrical portion 49 having an inner diameter of about 15 to 20 mm forming an aperture passage 48 at the center thereof, and a plurality of positioning projections formed on the outer surface of an annular flange 50 on the outer periphery thereof. The positioning projections 51, 51 are engaged with grooves (not shown) provided on the inner wall of the vaporizing cylinder 32, and are mounted on the mounting step 52 of the vaporizing cylinder 32. Along with the burner head 35, it is attached to the vaporizing cylinder 32 with screws (not shown).

A substantially oblong rectangular baffle plate 54 in plan view is integrally formed below the cylindrical portion 49 via a pair of connecting pieces 53 provided at symmetric positions. The gaps X and Y between the cylindrical portion 49 of the diaphragm plate 36 and the baffle plate 54 are arranged at a position slightly higher than the air inlet port 39, as shown in FIGS.
The side is wide and the side opposite to the air inlet 39 is narrow. Further, the baffle plate 54 has its center position P shifted toward the air inlet 39 with respect to the center PP of the cylindrical portion 49.

Reference numeral 55 denotes a frame rod; 56, an ignition rod; 57, a burner stand mounted on the cylindrical portion 25; 58, a ventilation duct mounted on the burner stand 57; A secondary air guide ring having an outer peripheral portion sandwiched between a lower end portion of the combustion tube 59 and an upper end portion of the burner stand 57. An inner peripheral edge of the secondary air guide ring 60 is formed by slits 38, 38 of the burner ring 37. Closely opposed.

In the above configuration, the electric heater 4 for vaporization
When the temperature of the vaporizing cylinder 32 rises to a temperature equal to or higher than the vaporizable temperature of the liquid fuel due to energization to 1, the temperature detector (not shown) detects the temperature and the blower 20 starts operating, and the blower fan 22 of the blower 20 The rotation causes air to flow into the motor case 24.
And is sucked into the blower case 23. The air sucked into the blower case 23 is sent substantially uniformly over the entire circumference in the tubular portion 25 through the ventilation holes 29, 29 of the air distribution plate 28, and is sent into the tubular portion 29. Part of the air passes through the air inlet 39 and is supplied into the vaporization cylinder 32 as primary air.

Here, when the fuel pump 45 starts operating, the liquid fuel in the fuel tank 46 is pumped up by the fuel pump 45, passes through the oil supply pipe 44, and is ejected from the ejection port 43 at the tip of the fuel nozzle 42 to be vaporized. 32. The liquid fuel supplied into the vaporizing cylinder 32 is instantaneously vaporized on the inner wall of the vaporizing cylinder 32 and mixed with the primary air, and the mixed gas is supplied to the space between the cylindrical portion 49 of the throttle plate 36 and the baffle plate 54. From the X and Y portions, it enters the cylindrical portion 49, is guided to the small holes 34, 34 in the bottom wall of the burner head 35 through the throttle passage 48 in the cylindrical portion 49, and
The fuel gas flows into the inside of the flame 5 and is squirted from each of the flame holes 33, 33 and ignited by the spark of the ignition rod 56. A flame F is formed on the side of the flame holes 33, 33 to start combustion.

On the other hand, the remaining air sent into the cylindrical portion 25 passes through the secondary air holes 27, is ejected as secondary air into the burner stand 57, rises, is supplied to the flame F, and is supplied to the flame F. Promotes combustion. By controlling the number of revolutions of the motor 21 and the number of oscillations of the fuel pump 45 mutually,
The amount of combustion is switched from strong to weak in multiple stages or proportionally.

According to the present embodiment, the throttle plate 36 provided with a cylinder portion 49 forming a throttle passage 48 at a substantially central portion is disposed inside the vaporization cylinder 32 below the burner head 35. A generally oblong rectangular baffle plate 54 in a plan view is provided below the 36 cylindrical portion 49 via a pair of connecting pieces 53, 53, and the distances X and Y between the baffle plate 54 and the cylindrical portion 49 are determined by air introduction. Mouth 3
Since it is desired that the side on the side of the air inlet 39 is narrow and the side on the side opposite to the air inlet 39 is narrower, the amount of combustion air flowing into the cylindrical portion 49 is larger on the side of the air inlet 39 than before, and
The opposite side of the air inlet 39 is smaller than before. Accordingly, the amount of the combustion air flowing into the cylindrical portion 49 is substantially uniform over the entire circumference of the cylindrical portion 49 so that the amount of the air flowing through the throttle passage 48 and the burner head 35 is not deviated or varied. As a result, a mixed gas having the same amount of air is blown out from each of the flame holes 33 of the burner head 35 to prevent lifting combustion and red fire combustion, and a uniform and good stable combustion flame is formed over the entire circumference of the burner head 35. . for that reason,
The combustion range can be expanded, and poor ignition and combustion noise due to lifting can be prevented.

The baffle plate 54 has a plane shape much larger than the cross-sectional shape of the throttle passage 48, and the center position P of the baffle plate 54 with respect to the center PP of the cylindrical portion 49 of the throttle plate 36 is an air inlet. 39, it is possible to cover the upper part of the ejection port 43 at the tip of the fuel nozzle 42,
The distance Y between the cylindrical portion 49 on the side and the baffle plate 54 is determined by the air inlet 3
Even if it is wider than the interval X on the opposite side of 9, the fuel jetted from the jet port 13 of the fuel nozzle 42 can be prevented from flowing into the cylindrical portion 49 and flowing into the burner head 35 as it is,
It is possible to suppress mixing of red fire caused by unvaporized fuel into the blue flame F formed in the flame hole 33.

The baffle plate 54 includes a pair of connecting pieces 5.
Since it is integrally formed with the cylindrical portion 49 of the diaphragm plate 36 via the third and the third 53, it is not necessary to increase the number of parts.

[0024]

As is apparent from the above description, the present invention provides a vaporizing cylinder having a burner head provided on the upper part and an air inlet and a fuel nozzle provided on the peripheral wall, and a vaporizing cylinder below the burner head. And a throttle plate provided with a tubular portion forming a throttle passage at a substantially central portion, and provided at a distance from the tubular portion below the tubular portion of the throttle plate, and more than the air inlet. A baffle plate arranged at a high position, and the space between the cylindrical portion of the throttle plate and the baffle plate is formed so that the air inlet side is wide and the opposite side of the air inlet is narrow, so that the throttle passage and the burner It is possible to suppress the occurrence of deviation and variation in the amount of air flowing in the head, suppress the occurrence of lifting combustion and red fire combustion, and form a uniform and good stable combustion flame over the entire circumference of the burner head, The combustion range is wide and ignition is not It is possible to provide a or the liquid fuel combustion apparatus that suppresses the generation of combustion noise.

[0025] In the liquid fuel combustion apparatus according to the second aspect,
Since the center position of the baffle plate is shifted toward the air introduction port side with respect to the center of the cylinder portion of the throttle plate, the upper side of the jet port at the tip of the fuel nozzle is covered with the baffle plate, and the cylinder portion on the air introduction port side and the baffle plate are covered. Even if the distance between the fuel nozzle and the nozzle is wide, it is possible to prevent the fuel ejected from the fuel nozzle from flowing directly into the cylinder part in the unvaporized state and flowing into the burner head. Mixing of fire can be suppressed.

Further, when the baffle plate is integrally formed with the cylindrical portion of the diaphragm plate through a plurality of connecting pieces as in the embodiment, the number of parts does not need to be increased, and an increase in cost can be suppressed.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of the entire configuration of the liquid fuel combustion device.

FIG. 3 is a plan sectional view of the vaporization cylinder.

FIG. 4 is a plan view of the diaphragm plate.

FIG. 5 is a longitudinal sectional view of the diaphragm plate.

FIG. 6 is an overall configuration sectional view of a conventional liquid fuel combustion device.

[Explanation of symbols]

 32 Vaporization cylinder 35 Burner head 36 Throttle plate 39 Air introduction port 42 Fuel nozzle 48 Throttle passage 49 Tube portion 53 Connecting piece 54 Baffle plate P Center position of baffle plate PP Center of cylinder portion X interval Y interval

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-126909 (JP, A) JP-A-6-109214 (JP, A) JP-A-5-71620 (JP, U) JP-A-62-1 142617 (JP, U) Hira 3-121311 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23D 11/40 F23D 11/10

Claims (2)

(57) [Claims] 1. A vaporizer having an upper portion provided with a burner head, an air inlet and a fuel nozzle provided on a peripheral wall portion, and a vaporizer tube disposed below the burner head and forming a throttle passage substantially in the center. A diaphragm plate provided with a cylindrical portion to be provided, and provided at a distance from the cylindrical portion below the cylindrical portion of the diaphragm plate,
A baffle plate is provided at a position higher than the air inlet, and the gap between the cylindrical portion of the throttle plate and the baffle plate is formed such that the air inlet side is wider and the opposite side of the air inlet is narrower. A liquid fuel combustion device. 2. A vaporizer having an upper portion provided with a burner head, an air inlet and a fuel nozzle provided on a peripheral wall portion, and a vaporizer tube disposed below the burner head and forming a throttle passage substantially in the center. A diaphragm plate provided with a cylindrical portion to be provided, and provided at a distance from the cylindrical portion below the cylindrical portion of the diaphragm plate,
A baffle plate is provided at a position higher than the air inlet, and the gap between the cylindrical portion of the throttle plate and the baffle plate is formed such that the air inlet side is wider and the opposite side of the air inlet is narrower. And a baffle plate whose center position is shifted toward the air inlet with respect to the center of the cylindrical portion.