JP2713890B2 - Vaporization type combustion device - Google Patents

Description

The present invention relates to a vaporization type combustion device used for an oil fan heater, an FF type oil hot air heater or the like. (B) Conventional technology As disclosed in Japanese Patent Application Laid-Open No. 60-4713, this type of conventional gasification type combustion device is a burner case surrounding an outer periphery of a burner body provided with an electric heater for vaporizing petroleum fuel. And a part of the air blown from the combustion air blower is supplied as secondary air into the burner case, and the combustion secondary air rises in the space between the burner case and the burner main body and is formed at the flame outlet. It is supplied to the flame to promote secondary combustion. (C) Problems to be Solved by the Invention As described above, in the related art, when the burner is strongly burned, a large amount of secondary air is supplied to the burner case so as to be suitable for the strong combustion. Although the supply suppresses the generation of carbon monoxide, the flame spreads greatly during this strong combustion and moves away from the flame outlet, so the burner body is not easily heated by the flame, making it difficult for heat back to occur. In addition, since the peripheral side wall of the burner main body is cooled by the secondary air supplied in a large amount, the energization to the electric heater is frequently performed by a detector that detects the lowered temperature of the burner main body. there were. Accordingly, the present invention has been made in view of the above circumstances, and secondary air is supplied to the inside and outside of the flame holding ring from the secondary air hole of the annular secondary air supply chamber formed between the partition plate and the flame holding ring. An object of the present invention is to prevent the burner main body from being cooled by the secondary air, while improving the durability of the flame holding ring while supplying clean combustion exhaust gas. (D) Means for Solving the Problems The present invention vaporizes petroleum fuel supplied from a fuel pump, mixes the vaporized gas with primary air supplied from an air supply blower, and supplies it to a flame outlet. A burner main body, a burner head which is disposed at a tip end opening of the burner main body, and has a flame port provided on a peripheral wall thereof, a combustion cylinder having the burner head facing inside, and a base of the combustion cylinder. A partition plate for fixing and intercepting the inside of the combustion cylinder and the atmosphere around the burner main body; and an outer annular wall opposed to the peripheral wall of the burner head, and the peripheral wall of the burner head is annularly formed from the base end side of the burner head. A combustion chamber end plate provided on the partition plate to form an annular secondary air supply chamber between the partition plate and the flame retention ring. The air from the air supply blower is diverted and taken out. An inner secondary air hole for discharging secondary air along the inner and outer surfaces of the outer annular wall of the flame holding ring is connected to the annular secondary air supply chamber. The air hole is provided. (E) Function With this configuration, the air from the air supply blower supplied to the annular secondary air supply chamber via the secondary air supply pipe is ejected from the inner secondary air hole and the outer secondary air hole. As a result, the air flows along the inner and outer surfaces of the outer annular wall of the flame holding ring facing the peripheral wall of the burner head, so that it is possible to hasten the contact of the secondary air with the combustion flame formed at the flame outlet. At the same time, the mixing with the secondary air becomes good, and the combustion reaction is promoted, and the outer annular wall can be cooled from the inside and outside by the secondary air, so that the durability of the flame holding ring can be improved. In addition, a combustion chamber end plate is provided on the partition plate to form an annular secondary air supply chamber between the partition plate and the flame holding ring, and the air from the air supply blower is divided into the annular secondary air supply chamber. Since the burner body is not cooled by the secondary air as in the conventional case, the heat back by the combustion flame of the flame opening is performed favorably because the secondary air supply pipe is connected and taken in. As a result, the temperature of the burner main body can be stabilized. (F) Embodiment One embodiment of the present invention will be described below in detail with reference to the drawings. First, (1) is an outer case of the FF type hot air heater, (2) is a placing plate of the case (1), (3) is a blower for blowing hot air disposed in an upper portion inside the case (1), (4) is a ventilation path whose end communicates with a hot air outlet (not shown) at the lower front of the case (1), (5) is a partition wall that partitions the ventilation path (4) from the control room (6), 7) is a cartridge tank for supplying a fixed amount of petroleum fuel to the oil pan (8), and (9) is a protection plate for accommodating the tank (7). (10) is a fuel pump such as an electromagnetic pump provided above the oil pan (8), and (11) is a horizontal type vaporizing type burner (12) that uses the pump (10) to convert the oil fuel in the oil pan (8). ) Is an oil supply pipe having a supply nozzle (13). (14) is an air supply blower that takes in air from outside, and (15) is an air supply nozzle (17) that supplies combustion air to the burner (12) through an air supply controller (16).
An air supply pipe for more air supply, (18) is a secondary air supply pipe branched from the air supply pipe (15). (19) is a combustion tube forming a combustion chamber (20), (21) is a communication housing, (22) is a heat exchanger composed of a plurality of pipes, (2)
Reference numeral 3) denotes an exhaust pipe for discharging the combustion exhaust gas of the vaporizing burner (12) to the outside of the room via a collective housing (24) connected to the heat exchanger (22). Next, the vaporizing burner (12) will be described with reference to FIG. (25) is an iron casting whose internal space is a vaporization chamber (26),
Burner body with one side opening made of aluminum die cast,
(27) is a vaporization heater embedded in a burner body (25) for keeping the vaporization chamber (26) at the vaporization temperature of petroleum fuel, and (28) is disposed at an open end of the burner body (25). The throttle plate (29) has a large number of flame openings (30) formed in the peripheral wall for forming a combustion flame, and is fixed to the end of the throttle plate (28). Evaporation room installed (26)
The burner head communicates with. (31) is a foaming heat insulating material such as lithflex which covers the outer periphery of the burner body (25), and (32) is a rectangular tubular stainless steel for holding the heat insulating material (31). The holding housing (33) is a burner thermistor for detecting the temperature of the burner main body (25) and penetrates the holding housing (32) and the heat insulating material (31) and is in contact with the burner main body (25). (34) is a partition plate fixed to the partition wall (5) so as to close a lower opening of the partition wall (5), and (35) is a combustion chamber end integrated with the partition plate (34). The end plate (3
At the end of (5), the base end of the combustion cylinder (19) is fixed via a heat insulating sealing material (36). Reference numeral (37) denotes a flame holding ring plate for suppressing the spread of the combustion flame. An opening (38) slightly larger than the outer diameter of the burner head (29) is formed in the center portion. A mounting wall (39) fixed to the partition plate (34), and an inner annular wall (30) facing the flame opening (30) by bending an outer end of the mounting wall (39) in the horizontal direction. 40) and an inner annular wall (40) located approximately in the middle of the flame outlet (30)
A protruding wall (41) bent outward from the protruding wall (41);
The outer end of the burner head (29) is bent horizontally.
And an outer annular wall (42) formed so as to face the distal end portion of the peripheral wall portion and suppressing the outward spread of the combustion flame. The partition plate (34), the combustion chamber end plate (35), and the flame holding ring plate (37) are fixed respectively, but a circular concave portion (43) is formed in the center of the partition plate (34). Also, a protruding portion (45) is formed at the edge of the central opening (44) of the end plate (35), and the inner end of the protruding portion (45) is a protruding wall of the flame holding ring plate (37). Since it is fixed to the outer end of (41), a flat annular secondary air supply chamber (46) is formed on the outer periphery of the inner annular wall (40). Secondary air is supplied to the secondary air supply chamber (46) from the air supply blower (14) through a secondary air supply pipe (18) and an introduction pipe (47) connected to an inlet of the supply chamber (46). Air is introduced and secondary air is sent to the combustion flame from the inside of the outer annular wall (42) through an inner secondary air hole (48) which is annularly formed in the projecting wall (41). (42)
The secondary air is sent to the combustion flame from the outside through an outer secondary air hole (49) formed in a ring shape in the combustion chamber end plate (35). The inner secondary air hole (48) has a diameter of about 2 mm and is formed in the protruding wall (41) of the flame holding ring plate (37), and the outer secondary air hole (49) has a diameter of about 2 mm. It is 1.6 mm and is bored in the protrusion (45) of the end plate (35) of the combustion chamber, and the inner and outer secondary air holes (48, 49) are provided offset from each other.
(50) is a spark plug arranged facing the flame outlet (30), the base of which is a mounting hole (51) of a partition plate (34), a cutout groove (52) of a combustion chamber end plate (35), The flame holding ring plate (37) is attached to each of the cutout grooves (52). (54) is a flame rod that detects the flame ion current, and its base is a spark plug (50)
Same as above, the mounting hole (55) of the partition plate (34), the end plate of the combustion chamber (3
5) Notch groove (56), Flame retaining ring plate (37) notch groove (5)
7) Installed respectively. The opening (38) of the flame holding ring plate (37) and the opening (58) of the partition plate (34) have the same diameter,
An annular rib (59) protruding from the side surface on the opening side of the burner body (25) fits into the openings (38) and (58) and fits into the burner body (2).
5) is fixed. The operation of the above configuration will be described below. First, when the operation switch (shown) is closed by the user, the temperature of the burner body (25) is low and the burner thermistor (3) is closed.
The vaporization heater (27) detected by 3) is energized and heats the burner body (25). Eventually, when the temperature of the main body (25) rises to a temperature at which petroleum fuel can be vaporized, the air supply blower (14)
Starts the operation, introduces outside air into the vaporizing burner (12), discharges residual vaporized gas in the vaporizing chamber (26) to the outside, and performs prepurge. And when prepurge is performed for about 15 seconds,
The fuel pump (10) and the spark plug (50) operate. Therefore, the petroleum fuel in the oil pan (8) is ejected from the refueling nozzle (13) into the vaporization chamber (26) through the refueling pipe (11) and is vaporized, while the outside air through the air supply pipe (15) is vaporized. Is also introduced as primary air from the air supply nozzle (17) into the vaporization chamber (26), so that the vaporized gas and the primary air are mixed, and the air-fuel mixture is passed through the throttle plate (28) to the burner head (29). Flame mouth (3
0) spouted. Then, it is ignited by the spark plug (50). At this time, the secondary air is supplied to the flat annular secondary air supply chamber (46) through the secondary air supply pipe (18) by the operation of the air supply blower (14). Thus, the burner body (25) is supplied without cooling.
The secondary air in the secondary air supply chamber (46) is supplied to the outer secondary air hole (49) of the combustion chamber end plate (35) and the inner secondary air hole (48) of the flame holding ring plate (37). ) Is supplied to the combustion flame to promote secondary combustion. That is, the secondary air from the inner secondary air hole (48) enters the combustion flame and is well mixed with the flame, and the secondary air from the outer secondary air hole (49) is mixed with the flame outlet (30). The fuel is supplied so as to wrap the front end of the combustion flame at a position away from the outside, and the combustion is promoted better. The outer secondary air hole (49) is connected to the inner secondary air hole (4
Since the diameter is smaller than 8), the supply amount is small and the inner surface of the combustion cylinder (19) is not excessively cooled. Of course, since the combustion flame is narrowed by the flame holding ring plate (37), the combustion cylinder (19) is not locally heated. The ignition plug (50) stops the ignition operation about 20 seconds after the start of ignition. Further, combustion is performed in this manner, but the combustion exhaust gas is discharged from the exhaust pipe (23) to the outside through the connecting casing (21), the heat exchanger (22), and the collective casing (24). When the temperature of the combustion tube (19) rises and reaches a predetermined temperature, the hot air blower (3) starts to operate, and the lower portion of the front lower part of the outer case (1) is started via the air passage (4). Warm air is supplied from a warm air outlet (not shown) into the room to heat the room. When the burner main body (25) is heated by the combustion flame and is heated back by the combustion, the vaporization heater (27) stops energization. (G) Effects of the Invention As is apparent from the above description, the present invention vaporizes petroleum fuel supplied from a fuel pump, mixes the vaporized gas with primary air supplied from an air supply blower, and forms a flame outlet. A burner main body to be supplied to the burner main body, a burner head provided at the front end opening of the burner main body, and having the flame port provided on a peripheral wall thereof,
A combustion cylinder with the burner head facing the inside, a partition plate for fixing the base of the combustion cylinder and intercepting the inside of the combustion cylinder and the atmosphere around the burner body, and an outer ring facing the peripheral wall of the burner head A flame holding ring that has a wall and covers the peripheral wall of the burner head in an annular shape from the base end side of the burner head, and a combustion chamber end plate is provided on the partition plate to provide a space between the partition plate and the flame holding ring. Forming an annular secondary air supply chamber, connecting a secondary air supply pipe that divides and takes in air from the air supply blower into the annular secondary air supply chamber, and
The annular secondary air supply chamber is provided with an inner secondary air hole and an outer secondary air hole for ejecting secondary air along both the inner and outer surfaces of the outer annular wall of the flame holding ring. The contact with the secondary air can be accelerated with respect to the combustion flame formed in the part. Since the secondary air can be supplied in a state where it can be mixed easily, the combustion reaction is promoted and the combustion exhaust gas becomes clean. Since the annular wall is cooled from inside and outside by the secondary air, not only can the durability of the flame holding ring be improved, but also the annular secondary air supply chamber formed between the partition plate and the flame holding ring. Is connected to a secondary air supply pipe that divides and takes in air from the air supply blower, so that the burner body is not cooled by the secondary air, and the heat Is performed well, and Result, stabilization of the temperature of the burner body Hakare, the vaporization becomes good, also possible to shorten the energizing time to the vaporization heater is economical.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a main part of a vaporization type combustion apparatus, FIG. 2 is an exploded perspective view of members forming a flat annular secondary air supply chamber, and FIG. The simplified vertical cross-sectional views of the FF type hot air heater to which the apparatus is applied are respectively shown. (10)… fuel pump, (14)… air supply blower, (1
9) Combustion cylinder, (25) Burner body, (29) Burner head, (30) Flame port (flame port), (34) Partition plate, (35) Burning Room end plate, (37) …… flame holding ring,
(42) ... outer annular wall, (46) ... annular secondary air supply chamber, (48) ... inner secondary air hole, (49) ... outer secondary air hole.

Claims (1)

(57) [Claims] A burner main body that vaporizes petroleum fuel supplied from a fuel pump, mixes the vaporized gas with primary air supplied from an air supply blower, and supplies the mixed gas to a flame outlet, and is disposed at a tip end opening of the burner main body. A burner head provided with the flame outlet on the peripheral wall thereof, a combustion cylinder having the burner head facing the inside, a base of the combustion cylinder being fixed, and the inside of the combustion cylinder and the atmosphere around the burner main body. A partition plate for shutting off, and a flame holding ring having an outer annular wall facing the peripheral wall portion of the burner head and covering the peripheral wall portion of the burner head in a ring shape from the base end side of the burner head, and burning the partition plate. A secondary end is provided by forming a chamber end plate to form an annular secondary air supply chamber between the partition plate and the flame holding ring, and a secondary air is taken into the annular secondary air supply chamber by diverting air from the air supply blower. Connect an air supply pipe, and The secondary air supply chamber is provided with an inner secondary air hole and an outer secondary air hole for ejecting secondary air along both the inner and outer surfaces of the outer annular wall of the flame holding ring. .