JPH0125860Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to liquid fuel combustion devices, particularly to the structure of a premix combustion device.

[Conventional technology]

Conventionally, as shown in FIG. 1, in a liquid fuel combustion apparatus, liquid fuel is sprayed from a pressure spray nozzle 29 into a vaporization tube 15 to be vaporized, and a premixed gas of the vaporized fuel and primary air is combusted. A ventilation duct 35 is provided so that the spray direction and the combustion air substantially intersect with the pressure spray nozzle 29, and the primary air is sent to the vaporization tube 15 through the orifice 36 of the vaporization tube 15 together with the liquid fuel sprayed from the pressure spray nozzle 29. It is known that things can flow into the body.

[Problem to be solved by the invention] However, in this device, the primary air flow is
2 and the pressure spray nozzle 29, causing a drift phenomenon. In addition, this drifting phenomenon causes a lopsided flow of premixed gas, causing unilateral combustion.
It induces red flame, lifting phenomenon and narrows the good combustion range.

By the way, in order to prevent the premixed gas from drifting, it is possible to insert some porous materials such as wire mesh or punched metal inside the flame mouth of the burner head, but this increases the air blowing resistance and requires a larger blower. It was a problem.

Therefore, it is an object of the present invention to prevent uneven flow of combustion air.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a liquid fuel combustion apparatus that sprays liquid fuel from a pressure spray nozzle into a vaporization cylinder and combusts a premixed gas of the vaporized fuel and primary air. A blower duct is arranged so that the spray direction and the combustion air substantially intersect with the nozzle, while a rectifier tube extends in the spray direction of the nozzle so as to surround the pressure spray nozzle and introduce primary air. The vaporizing tube and the straightening tube are surrounded by a blowing pot through a secondary air passage gap, and the connecting opening between the blowing pot and the blowing duct is connected to the straightening tube. It is characterized by being opposed to each other with a gap between them.

[Effect]

In the present invention, when the combustion air flows into the ventilation pot through the connecting opening between the ventilation pot and the ventilation duct, it collides with the rectifier tube disposed opposite to the opening. Therefore, the dynamic pressure of the combustion air is reduced by the straightening tube, and the combustion air uniformly flows into the straightening tube and is supplied as primary air.

〔Example〕

Hereinafter, an embodiment of the present invention will be described based on FIG. 2.

Fig. 2 shows the combustion device of the embodiment placed and fixed above a can body 1 filled with water. First, the blower pot 10 consists of a cylindrical case portion 11 and a blower pot body 12, both of which are screwed together. They are mutually fixed by 14. Inside the case portion 11, vaporizer cylinders 15 are arranged at intervals. This vaporizing cylinder 15 is fixed to the case part 11 with screws 16, and a large number of secondary air holes 32 are bored around the part of the case part 11 where the vaporizing cylinder 15 is fixed.

The vaporizing cylinder 15 has a vaporizing wall 17 in the middle thereof, and a large number of through holes 18 are formed in the vaporizing wall 17 at equal intervals on a circle centered on the cylinder axis.

Further, below the vaporization wall 17, a burner head 23 is fastened and supported by bolts 24 via a mixing ring 19. Here, the burner head 23 has a large number of flame ports 25 arranged in a ring, and
A wire mesh 21 is disposed on the inner peripheral surface so as to cover the mixing ring 19 from the inside, and a wire mesh 22 extending from the periphery of the opening 33 of the mixing ring 19 to the burner head 23 is arranged concentrically with the wire mesh 21 inside.

Furthermore, a heat recovery ring 34 is placed around the vaporization cylinder 15.
is fitted to cover the flame port 25, and a sheathed heater 26 for preheating is buried therein. The sheathed heater 26 is turned on and off by a thermistor 39 inserted into the vaporization cylinder 15.

Here, the space 27 above the vaporization wall 17 is called a "vaporization chamber" for convenience, and the space 28 inside the burner head 23 below the vaporization wall 17 is called a "mixing chamber" for convenience.
and communicate with each other through a through hole 18 in the vaporization wall 17.

Now, a pressure spray nozzle 29 is provided in the center of the top wall of the ventilation pot body 12. A blower duct 35 is connected to the connection opening 40 of the blower pot main body 12 so that the spray direction of the pressure spray nozzle 29 substantially intersects the combustion air.

Further, the above-mentioned rectifier tube 13 is a pressure spray nozzle 29.
extends in the spray direction of the nozzle 29 so as to surround the
It is fitted into the opening flange 11a of the case portion 11. Further, the rectifying cylinder 13 faces a connecting opening 40 between the blower pot 10 and the blower duct 35 with a gap therebetween. Further, the inside of the rectifier cylinder 13 communicates with the orifice 36 of the vaporizer cylinder 15 facing the pressure spray nozzle 29 and the inside of the vaporizer cylinder 15 . In addition, the vaporization cylinder 15 and the rectification cylinder 13 are connected to the secondary air passage gap 4.
1 and surrounded by the ventilation pot 10.

As in the conventional case, the nozzle 29 is used to spray liquid fuel that is pumped by an electromagnetic pump 37, and the sprayed fuel enters the vaporization chamber 27 and mainly hits the vaporization wall 1.
Collision with 7.

The blower duct 35 has a built-in blower 31, and air from the blower 31 not only flows into the vaporization chamber 27 as primary air, but also flows through the secondary air hole 32 of the case portion 11 to the case portion 11 and the vaporization tube 15.
The air flows into the secondary air passage gap 41 between the air and the air, and further reaches the lower part of the vaporization cylinder 15, where it is supplied as secondary air.
Now, at the start of the combustion operation, the sheathed heater 26 is energized to preheat the vaporizing cylinder 15, and the blower 31 is driven, and fuel is sprayed from the nozzle 29. While being vaporized in the vaporization chamber 27, the sprayed fuel passes through the through hole 18 in the peripheral portion of the vaporization wall 17 together with the primary air, and then reaches the mixing chamber 28 through the opening 33 of the mixing ring 19. In this way, a premixed gas of vaporized fuel and primary air is formed and is ejected from the numerous flame ports 25. Therefore, when a spark is emitted by the spark plug 38, combustion is started and a flame is formed in the combustion chamber 2 of the can body 1. By the way, when the combustion air flows into the ventilation pot 10 through the connecting opening 40 between the ventilation pot 10 and the ventilation duct 35, it collides with the rectifier tube 13 disposed opposite to the opening 40. Therefore, the dynamic pressure of the combustion air is reduced by the straightening tube 13, and the combustion air uniformly flows into the straightening tube 13, where it is supplied as primary air.

Therefore, the amount of premixed gas ejected from each flame port 25 is uniform and homogeneous, and the phenomenon of one-sided combustion disappears. In addition, the backflow of the vaporized gas generated in the vaporization chamber 27 means that the blowing pressure inside the rectifying tube 13 is
It is prevented because it is higher than that of 7.

Of course, during combustion, the heat recovery ring 34 at the lower part of the vaporization tube 15 is heated, and the combustion heat is transferred to the vaporization chamber 27, so it is not necessary to drive the sheathed heater 26.

[Effect of idea]

As described above, in the present invention, when combustion air flows into the ventilation pot through the connecting opening between the ventilation pot and the ventilation duct, it collides with the rectifier tube placed opposite to the opening, so that the combustion air The dynamic pressure is reduced by the rectifying cylinder, and the air flows uniformly into the rectifying cylinder and is supplied as primary air.

Therefore, the premixed gas ejected from each flame port becomes uniform and homogeneous, which has the effect of eliminating the phenomenon of one-sided combustion.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventional liquid fuel combustion device.
FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. 1...Can body, 2...Combustion chamber, 10...Blower pot, 11...Case portion, 11a...Opening flange, 12...Blower pot body, 13...Blower tube,
14...screw, 15...vaporizer tube, 16...screw,
17... Vaporization wall, 18... Through hole, 19... Mixing ring, 21... Wire mesh, 22... Wire mesh, 23...
Burnahed, 24... Bolt, 25... Flame Mouth,
26...Sheathed heater, 27...Upper space, 28
...Inner space, 29...Pressure spray nozzle, 31...
...Blower, 32...Secondary air hole, 33...Opening,
34...Heat recovery ring, 35...Blower duct, 3
6... Orifice, 37... Electromagnetic pump, 38...
... Spark plug, 39 ... Thermistor, 40 ... Connection opening, 41 ... Secondary air passage gap.

Claims (1)

[Scope of utility model registration request] In a liquid fuel combustion device that sprays liquid fuel from a pressure spray nozzle into a vaporization cylinder and vaporizes it, and combusts a premixed gas of the vaporized fuel and primary air, the spray direction and combustion direction of the pressure spray nozzle are determined. While the blower duct is arranged so that the air substantially intersects, the rectifier cylinder is extended in the spraying direction of the nozzle so as to surround the pressure spray nozzle and introduce primary air, and is communicated with the inside of the vaporizer cylinder. Further, the vaporizing tube and the straightening tube are surrounded by a blowing pot through a secondary air passage gap, and further, the connecting opening between the blowing pot and the blowing duct is opposed to the straightening tube with a gap therebetween. A liquid fuel combustion device characterized by: