JPH029224Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a vaporization type combustion device that vaporizes and burns liquid fuel such as petroleum.

(b) Prior art Liquid fuel pressurized by a pump is forced into a vaporization chamber through a fuel nozzle facing into an air nozzle and vaporized, and a premixed gas of the vaporized gas and combustion air is passed through a throttle passage. The vaporization type combustion device that leads to the burner section is published in Utility Model Publications No. 57-1323 and 57-1324.
No. 57-1325, etc., and is publicly known.

Next, the conventional device will be explained with reference to FIG. 3. 1 is a vaporization cylinder made of aluminum or the like, and the inside is a vaporization chamber 3 heated by an electric vaporization heater 2 embedded in the peripheral wall. There is. 4 is a throttle passage through which the premixed vaporized gas in the vaporization chamber 3 flows out; 5 is a throttle plate integrally provided with a hanging tube 6 forming the throttle passage 4; the upper side of the throttle plate 6 has two porous holes; Part 7
A rectifying plate 7 formed by a and 7b is attached.
8 is a burner section provided with a large number of flame ports 9, 9, . . . Reference numeral 10 denotes an oil leveler, and the liquid fuel in the oil leveler 10 is pumped up and pressurized by an electromagnetic pump 11, and is forced into the vaporization chamber 3 through an oil supply pipe 12 from an oil supply nozzle 13 into the vaporization chamber 3. Reference numeral 14 denotes an air supply blower that supplies combustion air into the vaporization chamber 3, which supplies air through an air supply pipe 15 whose tip faces the vaporization chamber 3, and which blows the liquid fuel vaporized in the vaporization chamber 3. to generate a premixed gas.

(c) Problems to be Solved by the Invention In the conventional structure configured as described above, the entrance 4' of the throttle passage 4 for leading out the premixed gas from the vaporization chamber 3 toward the burner section 8 is Since it is opened at a position above the fuel supply nozzle 13, a part of the particulate liquid fuel ejected from the fuel supply nozzle 13 is drawn into the premixed gas flow and flows out to the burner section 8 in an unvaporized state. There is a drawback that a large amount of red flame that generates soot is mixed into the blue combustion flame 16 formed at the flame port 9. In order to solve this drawback, the current plate 7 is formed of two porous members 7a and 7b. However, this method not only complicates the structure of the burner part, but also makes the rectifying plate 7b more likely to receive combustion heat and be heated, making it easier for flames to be drawn into this part and cause backfire. There was a problem.

Furthermore, in the method disclosed in Japanese Patent Application Laid-Open No. 18209/1983, a disk-shaped rectifying member is provided in the vaporization chamber in front of the throttle passage to prevent unvaporized fuel from flowing into the burner section. In this device, the disk-shaped rectifying member is installed at an offset position in the vaporization chamber, so the premixed gas of vaporized gas and combustion air in the vaporization chamber not only flows unevenly in the throttle passage, but also Since there is nothing between the combustion chamber and the flame port of the burner section, the premixed gas is not uniformly supplied to the flame port of the burner section, which has the drawback that breathing combustion occurs particularly during weak combustion.

The present invention was developed in view of the above-mentioned facts, and it is possible to supply the premixed gas almost uniformly to the burner port without complicating the structure of the burner section or causing flashback, and thereby allowing the gas to breathe. The purpose is to prevent combustion.

(d) Means for solving the problem The present invention includes a bottomed cylindrical vaporizing cylinder having an opening at the upper end and a vaporizing chamber inside, and an air nozzle and a refueling nozzle facing the vaporizing chamber. , a diaphragm plate attached to the opening of the vaporization cylinder and having a recess on its upper surface; a cylindrical part that hangs down from the diaphragm plate and forms a diaphragm passage connecting the recess and the vaporization chamber; The burner head includes a cylindrical burner head with an open bottom, and a burner section consisting of a head top plate that closes the upper end opening of the burner head, and the burner head has a plurality of flame ports on a peripheral wall and a plurality of holes at the bottom. In addition, a disc-shaped disk whose bottom part is placed on the aperture plate, and which faces the inlet of the aperture passage at a predetermined distance from the inlet of the aperture passage and is also spaced apart from the peripheral wall of the vaporization chamber. This is a configuration in which a rectifying member is provided.

(e) Effect In the present invention, the premixed gas in the vaporizing chamber passes between the rectifying member and the cylindrical portion, enters the throttle passage, and flows approximately uniformly within the throttle passage without being concentrated in any part of the passage. The premixed gas flowing out of the throttle passage enters the space formed by the recess in the throttle plate, and from there enters the interior of the burner head while being substantially uniformly distributed through the plurality of holes in the bottom of the burner head. The premixed gas that has flowed into the burner head in this way is distributed and supplied to the plurality of flame ports almost uniformly, so that even in the case of weak combustion, green flame combustion occurs without breathing. Moreover,
The bottom of the burner head also serves as a rectifying plate, and the premixed gas is dispersed using the rectifying part and the recesses in the throttle plate, so the burner part does not become complicated and there are no protrusions inside the burner head. There is no need to worry about flames being drawn into the burner head and causing backfire.

(F) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 20 denotes a cylindrical vaporizing cylinder with a bottom made of aluminum die-casting or the like. A disk-shaped electric heater 21 made of a ceramic heater for vaporizing is fixed to the bottom surface of the cylinder by a support fitting 22, and the inside is a vaporizing chamber. 23. 24 is the vaporization chamber 23
A supply air blower that forcibly supplies combustion air into the
25 is an air pipe forming the air passage of the blower 24; 26 is an air nozzle connected to the downstream side of the air pipe 25;
It is provided in the tangential direction of the vaporizer cylinder 20 so that the air flow supplied therein becomes a swirling flow. 27 is an oil leveler; 28 is an electromagnetic pump that pumps up the liquid fuel in the oil leveler 27, pressurizes it, and pumps it into the vaporization chamber 23 through a fuel supply nozzle 30 facing into the air nozzle 26 through a fuel supply pipe 29; Due to the pressurizing action of the pump 28, the liquid fuel is ejected from the fuel nozzle 30 in the form of fine particles. Further, both the air nozzle 26 and the oil supply nozzle 30 located at the center thereof are located approximately in the middle of the vaporization chamber 23 and are opened. 31 is the vaporizer cylinder 2
The burner part is connected to the upper end of 0, and the flame ports 32, 3
2. Mesh-shaped gold 33 on the inner and outer peripheries, respectively.
34 and a plurality of small holes 35, 3 on the bottom surface.
It is composed of a burner head 36 in the shape of a cylinder with a bottom and a head top plate 37.

Reference numeral 38 refers to a premixed gas of vaporized gas of liquid fuel generated in the vaporization chamber 23 and combustion air to the burner section 3.
1, and a throttle plate formed with a throttle passage 39 for holding the premix.
Reference numeral 9 is formed by a hanging cylinder part 40 which is integrally provided downward from approximately the center of the aperture plate 38.
Further, the upper surface of the aperture plate 38 is configured to form a groove 41 to form a small space with the lower surface of the burner head 36. . 42 is formed by integrally bending vertical pieces 44, 44 at both ends of a disk portion 43 having a larger area than the lower end opening 39' of the throttle passage 39, and the tips of the vertical pieces 44 are formed in a substantially convex shape.
5, 45, . ', 45'... are brought into contact with the peripheral edges of the insertion holes 38', 38', respectively, and bent. Therefore, the disk portion 43 of the rectifying member 42 faces the lower end opening 39' of the throttle passage 40 with a predetermined distance of about 4 to 10 mm,
Further, it is suspended from the diaphragm plate 38 so as to be spaced from the peripheral wall of the vaporization chamber 23 at a substantially uniform interval.

The liquid fuel pressurized by the pump 28 is pumped in the form of fine particles into the vaporization chamber 23 from the fuel supply nozzle 30 together with the swirling flow of combustion air discharged from the air nozzle 26. The liquid fuel pressure-fed into the vaporization chamber 23 comes into contact with the lower circumferential wall surface and bottom surface of the vaporization chamber 23 and most of it vaporizes instantly, but the fuel that is not vaporized at that time is transferred to the disc part 43 of the rectifying member 42. Therefore, by expanding the swirling flow of combustion air rising in the vaporization chamber 23 outward, the swirling flow of combustion air collides with the disk portion 43 of the flow regulating member 42 and is vaporized. Further, the fuel that does not collide with the disk portion 43 collides with the upper peripheral wall of the vaporization chamber 23 and is vaporized as the combustion air is expanded to the upper peripheral wall of the vaporization chamber 23 . The premixed gas of vaporized gas and combustion air thus vaporized flows substantially uniformly in the throttle passage 39 through the gap between the disk portion 43 of the rectifying member 42 and the peripheral wall of the vaporization chamber 23 . The premixed gas flowing out from the throttle passage 39 once enters the space formed by the concave groove 41 of the throttle plate 38, and from there is dispersed almost uniformly into the plurality of small holes 35 at the bottom of the burner head 6. Go inside. Since the premixed gas that has flowed into the burner head 36 in this way is distributed and supplied to the plurality of flame ports 32 in a substantially uniform manner, even in the case of weak combustion, green flame combustion occurs without breathing. Moreover, the bottom of the burner head 36 also serves as a rectifying plate, and such a rectifying part and the concave groove 41 of the throttle plate 38
Since the premixed gas is dispersed using
Since the burner part 31 is not complicated and there is no protrusion inside the burner head 36, the burner head 3
There is no need to worry about the flame being drawn into the 6 and causing a backfire.

(g) Effects of the invention In the invention, vaporized gas is premixed with combustion air in the vaporization chamber 23, and the premixed gas is led to the burner part 36 through the throttle passage 39, and the flame nozzle 3
2, 32... to form a blue combustion flame A and burn it.
The particulate fuel ejected from the refueling nozzle 30 does not flow into the throttle passage 39 in an unvaporized state and lead out to the burner section 31 as in the conventional case, and a large amount of red flame is present in the blue combustion flame. This not only reliably and easily prevents the conventional drawback of contamination with the vaporized gas in the vaporizing chamber 23 and the combustion Passage 3 throttles the premixed gas with air
9, it can be flowed almost uniformly without deviation,
Further, the premixed gas flowing out from the throttle passage 39 once enters the space formed by the groove (recess) 41 of the throttle plate 38, and is almost uniformly dispersed from there into the plurality of small holes 35 at the bottom of the burner head 36. Since the premixed gas enters the burner head 36 while being heated, the premixed gas can be supplied almost uniformly to the plurality of flame ports of the burner head 36, and even in the case of weak combustion, good blue flame combustion can be achieved without causing breathing. You can make it happen. Moreover, the bottom of the burner head 36 also serves as a rectifying plate, and the premixed gas is dispersed using such a rectifying part and the groove (recess) 41 of the throttle plate 38, so the burner part 31 becomes complicated. Since there is no protruding object inside the burner head 36, the flame can be prevented from being drawn into the burner head 36, and backfire can be prevented.

Furthermore, by providing the flow regulating member 42 opposite the inlet 39' of the throttle passage 39, the vaporization chamber 2
The residence time of the combustion air in the vaporization chamber 23 can be increased, and the premixing of the vaporized gas and the combustion air in the vaporization chamber 23 can be promoted, allowing good combustion.

Furthermore, by providing the rectifying member 42 at a predetermined distance from the inlet 39' of the throttle passage 39, even if fuel is supplied into the vaporization chamber 23 from the pump 28 in a pulsating manner, the pulsating flow can be prevented. Vaporization chamber 2 by rectifying member 43
This can be suppressed to a minimum by increasing the pressure within 3.

[Brief explanation of the drawing]

FIGS. 1 and 2 are diagrams showing one embodiment of the present invention, and FIG. 3 is a diagram showing a conventional embodiment. 20... vaporization cylinder, 23... vaporization chamber, 39... throttle passage, 40... hanging cylinder part, 42... rectification member,
43...Disc part.

Claims (1)

[Scope of utility model registration request] A bottomed cylindrical vaporizing tube having an opening at the upper end and a vaporizing chamber inside, an air nozzle and a fuel nozzle facing the vaporizing chamber, and a recessed part attached to the opening of the vaporizing tube and on the top surface. a diaphragm plate having a diaphragm plate; a cylindrical portion that hangs from the diaphragm plate and forms a diaphragm passage connecting the recess and the vaporization chamber; a bottomed cylindrical burner head with an open upper end; a burner section consisting of a head top plate that closes the opening;
A disc-shaped flow regulating member whose bottom portion is placed on the throttle plate, and which faces the inlet of the throttle passage at a predetermined distance from the vaporization chamber, and is also spaced from the peripheral wall of the vaporization chamber. A vaporizing combustion device characterized by being provided with.