JPH0730907B2 - Combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a combustion apparatus such as a radiant oil heater.

(B) Conventional technology Conventionally, as a combustion device of this type, as disclosed in Japanese Utility Model Laid-Open No. 52-98862, there is a device that increases or decreases the primary and secondary air amounts to be supplied as the combustion amount increases or decreases. It is well known.

(C) Problems to be Solved by the Invention However, in the combustion device of this conventional configuration, if the combustion amount of the burner is weakened, the primary and secondary air amounts are reduced, so the temperature of the exhaust gas is lowered and the exhaust gas amount is reduced. Since the amount of exhaust gas decreases, the discharge speed slows down and water easily condenses in the exhaust device, and when the water accumulated in the exhaust device freezes on a cold day and blocks the inside of the exhaust device, the exhaust gas flows back into the room. There was a risk of carbon monoxide poisoning.

The present invention has been made in view of the problems of the above-described conventional technology, and even when the combustion amount increases or decreases, the amount of condensate in the exhaust device is minimized, and exhaust gas reverse flow due to blockage in the exhaust device is caused. The purpose is to prevent carbon monoxide poisoning etc.

(D) Means for Solving the Problems The present invention includes a combustor, a blower that supplies combustion air to the combustor, and a combustion cylinder in which combustion exhaust gas generated by the combustor flows. Part of the working air is mixed with the fuel as primary air and burned, and is supplied to the combustion flame forming part by the combustion of the mixture as secondary air, and the rest is burned above the secondary air supply part as tertiary air. A combustion device for supplying to a flame forming part, wherein the amount of air sucked from the outside of the blower is approximately constant,
The air passage thereof, the primary air and the secondary air flowing through the secondary air blowing passage, and the tertiary air is branched into a tertiary air blowing passage, further only to the primary and secondary air blowing passage, This is a configuration in which an air supply amount adjusting means for adjusting the air supply amount according to the combustion amount of the incinerator is provided.

(E) Operation With this configuration, the combustor is supplied with appropriate amounts of primary air and secondary air according to the amount of combustion from the blower, and the combustion state is stabilized. Also, since the air intake volume of the blower is approximately constant, the tertiary air supply volume decreases during strong combustion with large primary / secondary air supply volume, and the tertiary air supply volume during weak combustion with small primary / secondary air supply volume. The amount increases, and it is possible to maintain the outflow speed of the combustion exhaust gas that is equivalent to that during strong combustion even during weak combustion. Further, the excess air ratio can be increased by supplying the tertiary air to the combustor, and the steam generated by the combustion of the combustor can be efficiently discharged by utilizing the transport function of the combustion exhaust gas. Further, since the tertiary air is supplied to the combustion flame formation portion above the secondary air supply portion, complete combustion of the combustor is promoted and the generation of carbon monoxide is reduced.

(F) Embodiment One embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an essential part of the present invention. (1) shows a structure for supporting the burner body (7) by an air supply case for introducing primary air for combustion and secondary air for combustion promotion. ing. (2)
Is a burner motor, which is provided with a rotary shaft (3), and a conical cone (4) for atomizing liquid fuel, a rotary plate (5), and a mixing plate (6) premix the vaporized fuel and primary air. It is located in the premix chamber (8). A burner head having a straightening vane (9) for equalizing the air-fuel mixture and a slit-shaped flame port (10) installed to fix the straightening vane (9) at the tip of the burner body (7). (1
1) and are fixed. Further, the burner body (7) has a heater (12) for vaporizing liquid fuel during ignition.
And a burner thermistor (15) for detecting the temperature of the burner body (7), and the air supply case (1), the burner motor (2), the burner body (7) and the burner head (11). ) Etc. described later in the combustor (3
7).

(13) is a secondary air supply chamber for supplying secondary air to the combustion flame, and is formed between the burner case (14) and the burner body (7), and the burner case (14) is a heat insulating material (16). ) Is provided above the air supply case (1) and the bottom of the secondary air supply chamber (13) is provided with the air supply case (1), the heat insulating material (16), and the combustion chamber (16) in order to take in the secondary air. A plurality of through holes (17) penetrating the cylinder end plate (14) are provided at equal intervals, and the secondary air is a secondary air hole formed by the burner body (7) and the tertiary air straightening plate (22). It is supplied to the combustion flame from (18) along the burner body to promote combustion.

Further, (19) is a cylindrical combustion cylinder plate, the base portion of which is bent toward the burner head (11), and the outer peripheral end portion of the tertiary air straightening plate (22) is the lowermost part of the combustion cylinder plate (19). An inner peripheral end portion of the tertiary air rectifying plate (22) is connected to an inner peripheral surface of the bent portion of the combustion cylinder plate (19).
Further, a glass combustion cylinder (21) made of a heat-resistant transparent glass cylinder is placed and fixed on a support portion (19A) of the combustion cylinder plate (19) via a sealing material (20). A combustion cylinder (32) is formed by the glass combustion cylinder (21), the combustion cylinder plate (19) and the combustion cylinder end plate (14), and the combustion cylinder (32), the burner body (7) and the burner head (11). And forms a burning vacancy (x). And
The space formed by the tertiary air rectifying plate (22) and the combustion cylinder plate (19) supplies tertiary air from the outside of the combustion flame for promoting complete combustion in the tertiary air supply chamber (23). The surface (22A) of the tertiary air rectifying plate (22) facing the combustion flame is inclined inward at a depression angle of about 80 ° like the surface of a mortar. This side (22
In A), a plurality of tertiary air holes (24) are opened over the entire circumference at a predetermined distance above the tip of the burner body (7), and combustion is performed through the tertiary air holes (24). Tertiary air is supplied to the flame.

(25) is a supply duct for supplying primary and secondary air to the fixed plate (26), and (27) is a blower pipe for supplying tertiary air, which is fixed to the lower side surface of the combustion cylinder plate (19). There is. (2
8) is a spark plug that faces the flame port (10) and ignites the air-fuel mixture, and (29) is a frame rod as a flame detecting means that faces the combustion flame, and is attached to the lower side surface of the combustion cylinder plate (19). ing. Further, (43) is a porous red heat member vertically provided toward the burner head (11). Liquid fuel (31) is an electromagnetic pump that supplies liquid fuel through the oil feed pipe (30) facing the conical cone (4), and controls the fuel feed amount by varying the oscillation frequency of the oscillator. The oscillator is set to three levels of oscillation frequency: strong, medium and weak.

FIG. 5 is an overall view of the present invention, in which (33) is a top plate (34) at the upper end.
Is mounted on the outer case, (35) is a horizontal reflector that vertically separates the combustion section (36) and the combustor (37) provided in the middle of the outer case (33), and (38) is the horizontal reflector. A vertical reflector that stands on the plate (35) in the exterior case (35), (3
9) is an exhaust casing mounted on the upper part of the exterior case (33). An exhaust gas inflow portion (40) is provided at the center of the lower surface of the exhaust casing (39), and an exhaust gas outflow portion (41) for exhausting exhaust gas during combustion to the outside is provided at an appropriate position on the right end of the upper surface. An exhaust device (42) is connected to the exhaust outflow portion (41) through a through hole (34A) of the top plate (34).

2, 3 and 4 are longitudinal sectional views of a main part of a blower (44) for supplying air for supplying combustion air to the combustor (37), showing states of strong, medium and weak combustion, respectively. Is shown.
The blower (44) sucks primary, secondary, and tertiary air from the outside of the outer case (32) through the filter (46), and the air suction amount is constant. The blower case (51) of the blower (44) is made of metal or synthetic resin, and has one end communicating with the opening (45) of the air supply case (1) by a hose and the other end. Is connected to an opening (47) formed in the outer case (33). In addition, the blower motor (4
8) is fixed, and the blower fan (52) is fixed to the rotary shaft (50) of the blower motor (48) in the blower case (51). An air collecting chamber (53) is provided in the vicinity of the outlet of the blower case (51), and a partition plate (54) is formed in the center of the air collecting chamber (53) to form first, second and third opening areas.
Air vents (55) (56) (57) are opened with a small clearance.

On the other hand, a blower pipe (27) for supplying tertiary air and small holes (58) (59) directed inward are formed on the surface of the blower case (51) above the air collecting chamber (53). The recessed part (60) (6
1) is integrally formed, and a first opening / closing valve (62) for opening and closing the first air passage opening (55) is driven on the upper surface portion (66) with respect to the concave portions (60) (61). A first solenoid (64) for driving and a second solenoid (6) for driving a second opening / closing valve (63) for opening and closing the second air passage opening (56).
5) and are mounted and fixed respectively.

The operation will be described below with the above configuration. First, when the heater (12) is energized, the burner body (7) is heated, and when the burner body (7) reaches the vaporization temperature of the liquid fuel and the burner thermistor (14) detects the temperature, the air supply amount control device (44) is an air supply duct (25) and a blower pipe (27)
Primary, secondary, and tertiary air is supplied via. Next, the burner motor (2) is driven to rotate the conical cone (4), the rotary plate (5) and the mixing plate (6) at high speed, and at the same time, the liquid fuel is fed from the oil feed pipe (30) through the conical cone (4). 4) Supplied to the surface. The liquid fuel supplied to the conical cone (4) is supplied to the rotary plate (5).
Are scattered into fine particles by the centrifugal force, and are instantly vaporized on the inner surface of the heated burner body (7) to become vaporized fuel in the premixing chamber (8). On the other hand, primary air is sent into the premixing chamber (8), the vaporized fuel is premixed with the primary air, and is uniformly dispersed through the straightening vane (9), and then the burner head (11) is discharged. It is ignited by the jet ignition plug (28) to form a combustion flame and burn. The secondary air, which is a part of the air in the air supply case (1), passes through the plurality of through holes (17) and the secondary air supply chamber (13).
Flows into the inside and is supplied to the combustion flame along the burner body (7) through the secondary air hole (18) to promote combustion. Then, when the burner body (7) is heated by the combustion flame and the burner thermistor (15) detects a temperature higher than a predetermined temperature, the energization of the heater (12) is stopped.

Next, the case where the combustor (37) is changed to three stages of strong, medium and weak combustion will be described.

At the time of strong combustion, the first and second solenoids (64) (65) are provided as shown in FIG. 2 in order to supply the air amount necessary for completely burning the set oil feed amount into the air supply case (1). ) Driving the first and second on-off valves (62) (63)
Since the second air passage openings (55) (56) are opened, the primary and secondary air is supplied from the first, second and third air openings (55) (56) (57), and the amount of air for strong combustion is set. The air blower fan (52) (52) provides the amount of air required to burn the strong combustion oil feed amount.
Since it can supply the burner body (7) and the secondary air supply chamber (13) from the air supply case (1), stable strong combustion can be performed and a small amount of some air is blown from the blower pipe (27). The tertiary air is supplied from the tertiary air holes (24) into the combustion cylinder (32) to increase the excess air ratio and the exhaust gas temperature is high, so that the amount of condensed water can be extremely suppressed as shown in FIG.

Next, at the time of medium combustion, the first solenoid (64) is supplied as shown in FIG. 3 in order to supply the air amount necessary for completely burning the set oil feed amount at the time of medium combustion into the air supply case (1). Is not driven, the first air passage port (62) is closed by the first on-off valve (62), and the second solenoid (65) is driven to drive the second air passage port (5).
6) is opened. Therefore, the combustion air at the time of medium combustion passes through the second air passage port (56) and the third air passage port (57) to become an air amount, and the amount of air required to burn the medium combustion oil feed amount is increased by the fan. (52) (52) can supply air from the air supply case (1) to the burner body (7) and the secondary air supply chamber (23), and can supply a larger amount of air than in the strong combustion from the blower pipe (27) to the combustion cylinder. Since the excess air ratio can be further increased by supplying the tertiary air into the (32), the amount of condensate in the exhaust device (41) can be suppressed as shown in FIG. 7 even though the exhaust gas temperature is low.

Finally, at the time of weak combustion, the first and second solenoids are supplied as shown in FIG. 4 in order to supply the air amount necessary for completely burning the set oil feed amount at the time of weak combustion into the air supply case (1). (6
4) The (65) is not driven and the first and second opening / closing valves (62) (63) close the first and second air passage openings (55) (56). Therefore, the combustion air at the time of weak combustion is only the air that flows in from the third air passage port (57), and the amount of air required to burn the weak combustion oil feed amount is supplied by the fans (52) (52) to the air supply case ( 1) to burner body (7) and secondary air supply chamber (13)
It is possible to supply a larger amount of air to the combustion tube (32) through the blower pipe (27) into the combustion tube (32) to further increase the excess air ratio, so that the temperature of the exhaust gas is further increased. Although it is low, the amount of condensed water in the exhaust device (42) can be suppressed as shown in FIG.

(G) Effect of the Invention According to the embodiment of the present invention, the air intake amount from the outside of the outer case (33) of the blower (44) that supplies all the combustion air to the combustor (37) is kept constant. , A blower passage of the blower (44) is configured by an air supply case (1), an air supply duct (25), and a part of the air supply case (51), and primary and secondary air in which primary air and secondary air flow The air passage case (51) is branched into a tertiary air passage that is configured by a passage, a blower pipe (27), and a part of the blower case (51), and tertiary air flows, and further, an air supply case (1), A first on-off valve that adjusts the air supply amount according to the combustion amount of the combustor (37) only in the primary and secondary air passages that are configured by the air supply duct (25) and part of the blower case (51). Since the (62) and the second on-off valve (63) (supply air amount adjusting means) are provided, the combustor (37) has an appropriate primary amount according to the combustion amount. Air and secondary air are supplied from the blower (44) to stabilize the combustion state. Further, since the air intake amount of the blower (44) is constant, the supply amount of the tertiary air flowing through the blower pipe (27) decreases during strong combustion with a large supply amount of the primary and secondary air, and the primary and secondary air is supplied. During weak combustion with a small amount of air supply, the supply amount of tertiary air flowing in the blower pipe (27) increases, and during weak combustion, it is possible to maintain the same outflow velocity of combustion exhaust gas as during strong combustion. Since the excess air ratio can be increased by the supply of the tertiary air, the steam generated by the combustion of the combustor (37) can be efficiently discharged to the outside by utilizing the transport function of the combustion exhaust gas, and as a result, the exhaust device (42 The amount of condensate in
There is no concern that the exhaust device (42) will be blocked by freezing of condensed water.

Further, in the combustor (37), the tertiary air is jetted and supplied from the tertiary air hole (24) of the tertiary air straightening plate (22) to the combustion space (X) above the secondary air hole (18). By supplying this tertiary air, complete combustion is promoted, and the amount of carbon monoxide generated can be reduced.

(G) Effect of the Invention (E) Effect of the Invention As is apparent from the above description, the present invention provides a combustor, a blower for supplying combustion air to the combustor, and a combustion exhaust gas generated by the combustor. With a combustion cylinder that circulates,
A part of the combustion air is mixed with the fuel as the primary air and burned, and is supplied to the combustion flame forming part by the combustion of the air-fuel mixture as the secondary air, and the rest is the tertiary air above the secondary air supply part. A combustion device adapted to supply to a combustion flame forming part, wherein an air intake amount from the outside of the blower is set to a substantially constant amount, and a ventilation passage of the combustion device is a primary / secondary air flow. Supply air for branching into a secondary air blow passage and a tertiary air blow passage through which tertiary air flows, and further adjusting the air supply amount only in the primary / secondary air blow passage according to the combustion amount of the combustor Since the structure is provided with the amount adjusting means, the following effects can be obtained.

An appropriate amount of primary air and secondary air according to the amount of combustion is supplied to the combustor from a blower, and the combustion state can be stabilized.

Air supply that adjusts the air intake amount of the blower to a substantially constant amount and adjusts the air supply amount according to the combustion amount of the combustor only in the primary and secondary air blow passages through which the primary air and the secondary air from the blower flow. By providing the amount adjustment means, the tertiary air supply amount decreases during strong combustion, and the tertiary air supply amount increases during weak combustion.Therefore, increase the outflow speed of the combustion exhaust gas during weak combustion in the same way as during strong combustion. Moreover, the excess air ratio can be increased by supplying the tertiary air to the combustor, and as a result, the steam generated by the combustion of the combustor is discharged by the action of transporting the combustion exhaust gas, and the condensate in the exhaust device is recovered. It can be suppressed efficiently.

Condensate in the exhaust system is suppressed over the entire combustion range from strong combustion to weak combustion, so it is possible to prevent the exhaust blockage phenomenon due to freezing of the condensate, and there is concern about exhaust gas leakage into the room due to the exhaust blockage phenomenon. No, the safety is improved.

Since the tertiary air is supplied to the combustion flame formation portion above the secondary air supply portion, the complete combustion of the combustor can be promoted and the amount of carbon monoxide generated can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a burner portion showing an embodiment of a combustion apparatus according to the present invention, and FIGS. 2, 3, and 4 are main-part vertical cross-sectional views showing respective combustion states of a blower. FIG. 2 is a diagram showing strong combustion, FIG. 3 is a diagram showing medium combustion, FIG. 4 is a diagram showing weak combustion, and FIG. 5 is an overall schematic sectional view of a combustion instrument equipped with a combustion apparatus according to the present invention. Is a plan view of the blower case, and FIG. 7 is a diagram showing the relationship between the excess air ratio and the amount of condensed water in the exhaust device. (1) …… Air supply case (primary and secondary air passages), (18)
...... Secondary air hole (secondary air supply part), (25) ...... Air supply duct (primary and secondary air passages), (27) ...... Blower tube (tertiary air passage), (32) ...... Combustion Cylinder, (37) ... combustor,
(44) …… Blower, (62) …… First opening / closing valve (supply amount adjusting means), (63) …… Second opening / closing valve (supply amount adjusting means),
(X) ... Combustion space (combustion flame formation part).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nao Saito 180 Sakata, Oizumi-cho, Gunma-gun, Osamu, Toyo Sanyo Electric Co., Ltd. (72) Inventor Akihiko Kogure 180 Sakata, Oizumi-cho, Gunma-gun, Tokyo Within Sanyo Electric Co., Ltd. (56) References Actually opened 61-39250 (JP, U) Actually opened 58-137230 (JP, U)

Claims (1)

[Claims] 1. A combustor, a blower for supplying combustion air to the combustor, and a combustion tube through which combustion exhaust gas generated by the combustor flows. A part of the combustion air is used as primary air for fuel. Combustion that is mixed with and burned, and is supplied as secondary air to the combustion flame formation part by combustion of the air-fuel mixture, and the rest is supplied as tertiary air to the combustion flame formation part above the secondary air supply part. In the device, the air intake amount from the outside of the device of the blower is set to a substantially constant amount, and the air passage thereof has a primary / secondary air flow passage through which the primary air and the secondary air flow, and a tertiary air flow. It is branched into a flowing tertiary air blowing path, and further, only in the primary / secondary air blowing passage, an air supply amount adjusting means for adjusting an air supply amount according to a combustion amount of the combustor is provided. Combustion device.