JPH0646112B2 - Hot air heater - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm air heater for general households, which burns petroleum and blows the combustion gas into a room for heating.

2. Description of the Related Art An indoor open-type warm air heater is composed of a burner part that vaporizes and burns fuel, and a combustion tube that guides the combustion gas.
A blower and an outlet provided opposite to the combustion tube are used to mix the air from the blower with the combustion gas discharged from the combustion tube to blow warm air from the outlet to heat the interior of the room. is there.

Hereinafter, an example of the above-described conventional warm air heater will be described with reference to the drawings.

FIG. 6 to FIG. 8 are cross-sectional views of main parts of a conventional warm air heater, and FIG. 9 is a cross-sectional view. 1 is a cylinder with a bottom,
It is a vaporization cylinder having a sheathed heater 2 built-in in the upper part, and has a throat 4 that ejects air at the same position as the nozzle 3 that ejects fuel on the side. The nozzle 3 is connected to an oil supply device (not shown) via an oil supply pipe 5.
The throat 4 is connected to a blower via an air supply hose 6. Reference numeral 7 denotes a vaporization cylinder lid which is placed on the upper part of the vaporization cylinder 1 and has an opening in the center. Installed on. A heat recovery ring 9 is attached to the outer periphery of the upper part of the vaporization cylinder 1 so as to face the flame opening of the flame holding plate 8. The outer periphery of the vaporization cylinder 1 is covered with a burner case 10 having an open upper part, and a cylindrical combustion cylinder 11 is placed on the upper part of the burner case 10, the lower end of which is connected to the burner case 10 and the upper end thereof. A combustion cylinder lid 12 having a central opening is attached to the opening, and an oxidation catalyst 13 is attached to the central opening of the combustion cylinder lid 12. Further, a plurality of air suction holes 16 are provided for taking in the air sent by the propeller fan 15 of the convection blower 14 from the blower outlet side, which will be described later, on the lower peripheral surface of the combustion cylinder 11, and cover the holes. As described above, a combustion cylinder duct 17 having a horseshoe shape and having a passage formed by the combustion cylinder 11 and the duct bottom 19a and having an opening on the side of the convection blower 14 is provided on the front half side of the combustion cylinder 11.
A blow-out port 18 is provided in front of the combustion tube 11 so as to face the convection blower 14, and the air sent from the convection blower is blown out of the room through the combustion tube 11 and the duct 19.

The operation of the warm air blower configured as described above will be described below.

The fuel sent from the fuel supply device is jetted from the nozzle 3 into the vaporization cylinder 1 via the oil supply pipe, and the combustion air sent from the air blower is jetted from the funnel 4 into the vaporization cylinder 1 via the air supply hose. To be done. On the other hand, the vaporization cylinder 1 has been heated to a high temperature in advance by the internal sheath heater 2, and the jetted fuel is instantly vaporized in the vaporization cylinder 1 and mixed with the combustion air jetted from the throat 4 to form the vaporization cylinder. It passes through the central opening of the lid 7 and is ejected from the flame opening of the flame holding plate 8. The jetted mixed gas is ignited by an ignition means such as a high-voltage spark discharge provided near the flame holding plate 8 to form a flame and burn. Further, as the combustion flame, the air from the convection blower 15 is supplied into the combustion cylinder 11 through the combustion cylinder duct 17 and the air intake hole 16 provided in the combustion cylinder 11, and becomes a safe combustion flame. The combustion heat generated by the combustion flame heats the combustion cylinder 11, and the combustion gas is discharged to the outside of the combustion cylinder 11 through the oxidation catalyst 13 above the combustion cylinder. The heated combustion cylinder 11 is heat-exchanged by the air sent from the convection blower 14, is mixed with the combustion gas, and is discharged into the room as warm air from the air outlet 18 to heat the room.

Problems to be Solved by the Invention A combustion flame is formed by the mixed gas ejected from the flame opening of the flame holding plate 8. However, since the air-fuel ratio of this mixed gas is low, the insufficient combustion air can be removed by a convection blower or the like. Must be replenished. Therefore, an air intake hole 16 is provided in the lower part of the combustion cylinder 11, and a convection blower 1 is provided through the combustion cylinder duct 17.
5, an appropriate amount of air is introduced into the combustion cylinder 11.
However, unless the distribution of the amount of air taken into the combustion cylinder 11 is made uniform in the circumferential direction, the combustion flame is distorted, and the exhaust gas performance deteriorates due to local excess or deficiency of the air amount (such as CO and soot). Occurrence). Further, in a place where the amount of air is insufficient, the combustion flame extends for a long time, and the outer flame comes into contact with the combustion cylinder to locally raise the temperature of the combustion cylinder, resulting in a problem of heat resistance. Therefore, it is necessary to uniformly introduce air in the circumferential direction in the combustion cylinder 11 and not disturb the combustion flame. However, in the conventional configuration, as shown in FIG. 9, the shape of the combustion cylinder duct 17 is a horseshoe-shaped bilateral symmetry, and the propeller fan 15 tends to cause air to be biased toward the downstream side in the rotational direction. The distribution of the amount of air introduced into the combustion tube 11 from the air blower 14 caused a bias. Further, when the propeller fan 15 rotates counterclockwise from the front, for example, on the right side of the combustion cylinder duct 17, the propeller fan 1 is rotated as indicated by an arrow A in FIGS. 6 and 7.
5 is blown up and the right side combustion cylinder 11
The negative pressure action may be exerted in the air intake hole 16 portion provided in the lower part, so that the combustion gas in the combustion cylinder 11 may be sucked out from the rearmost air intake hole 16 '(the side closest to the propeller fan 15). It was Therefore, as shown in FIG. 9, the combustion flame 8a is biased to one side, which adversely affects combustion. Further, since the amount of air introduced into the combustion cylinder 11 is biased, the amount of remaining air used for warm air is also laterally biased,
The hot air temperature and the hot air flow rate are not uniform, and there is a drawback that comfortable warm air performance cannot be obtained.

In view of the above problems, the present invention uniformly introduces the air from the convection blower into the combustion cylinder and at the same time prevents the adverse effect of blowing up the air flow from the convection blower to uniformly burn the combustion flame. The purpose of the invention is to improve the exhaust gas performance as a flame, to avoid the local temperature rise of the combustion cylinder, to improve the durability, and to obtain a comfortable warm air performance.

Means for Solving the Problems In order to solve the above problems, in the hot air heater of the present invention, the combustion cylinder duct for introducing air into the combustion cylinder is closed at its upper surface as a plate-shaped portion without holes. In addition, the side on which the blowing force generated by the rotation of the convection blower acts is asymmetrical by bringing the side of the convection blower side closer to the side where the negative pressure action due to the blowing force does not work on the air intake hole of the combustion cylinder. It is configured as

Effect The present invention has the above-described configuration, so that the amount of air introduced from the blower for convection into the combustion cylinder becomes uniform, and at the same time, the combustion gas and the like are not sucked out from the combustion cylinder, and the combustion becomes good. Also, the combustion flame can be stable and free from deformation, and the exhaust gas performance is improved. Further, the combustion cylinder is prevented from overheating due to the local extension of the combustion flame, and the heat resistance of the combustion cylinder is improved. Furthermore, by constructing the combustion cylinder duct in a left-right asymmetrical manner, the amount of air introduced into the combustion cylinder can be made uniform left and right as described above, and at the same time the amount of remaining air from the convection blower can be made uniform. As a result, it is possible to obtain a well-balanced warm air performance with little uneven temperature distribution even for the hot air discharged from the air outlet through the air outlet.

Example A warm air heater according to an example of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of each main part in one embodiment of the present invention, FIGS. 2 and 3 are overall sectional views, FIG. 4 is a lateral sectional view, and FIGS. 5 (a) and 5 (b) are the present invention. FIG. 3 is a side view and a plan view of the combustion cylinder duct according to FIG. The configuration of the present invention will be described below with reference to FIGS. Combustion cylinder duct 17 in the figure
Since the configuration of each part except a and 17b is as described in the conventional example, the same reference numerals as those in the conventional example are given and detailed description thereof is omitted here. The combustion cylinder ducts 17a and 17b of the present invention
For convenience of explanation, the right side is a combustion cylinder duct 17a and the left side is a combustion cylinder duct left 17b from the front side (from the outlet 18 side), but it is a horse-shaped integral part. The combustion cylinder duct right 17a is longer than the combustion cylinder duct left 17b as shown in FIG. 4, and the propeller fan 15 of the rear convection blower 14 is provided.
Located closer to. This is because the rotation direction of the propeller fan 15 rotates counterclockwise from the front. If the propeller fan 15 rotates counterclockwise, the combustion cylinder duct right 17a is more than the combustion cylinder duct left 17b. The length is also short, and the structure is located farther from the propeller fan 15 of the rear convection blower 14.

With the above-described configuration, the combustion flame formed by the flame openings in the side opening of the flame holding plate 8 causes the air from the convection blower 14 to flow through the combustion cylinder duct right 17a, the combustion cylinder duct left 17b, and the lower first half of the combustion cylinder 11. A complete combustion flame is obtained by introducing the air into the combustion cylinder 11 through the air intake hole 16 provided on the peripheral surface of the minute portion. The combustion heat from the combustion flame heats the combustion cylinder 11, and the combustion gas passes through the oxidation catalyst 13 above the combustion cylinder 11 and is discharged into the duct 19. The heated combustion cylinder 11 is heat-exchanged with the air sent from the convection blower 14 and, at the same time, is mixed with the combustion gas and discharged into the room as warm air from the air outlet 18 to heat the room.

In the combustion cylinder duct, when the propeller fan 15 rotates counterclockwise from the front, the combustion cylinder duct right 17a is moved to the convection blower 14 from the combustion cylinder duct left 17b.
Since it is provided at a position close to, the combustion cylinder duct right 17a,
The amount of air introduced from the left 17b is equalized. Further, when the propeller fan 15 rotates counterclockwise from the front, the air flow from the convection blower 14 near the air intake hole 16 of the right combustion cylinder 11 as shown by an arrow B in FIG. Is blown up, but the combustion cylinder duct right 17a
Extends to the side of the convection blower 14 and covers the air intake hole 16 ′ of the combustion cylinder 11 at the rearmost side (the side closest to the convection blower 14), the negative pressure action by the blowing force is applied to this air. It does not work in the suction hole 16 '. Therefore, as shown in FIG. 4, the combustion flame 8c formed at the flame opening of the flame holding plate 8 is evenly formed around the entire circumference, and is a complete combustion flame with no bias. That is, since a constant amount of stable air is supplied to the amount of introduced air in the circumferential direction of the flame stabilizing plate 8, the combustion exhaust gas performance is improved and the suction of the combustion gas due to the negative pressure may be eliminated. In addition, the combustion flame is elongated as in the conventional example, and the problems of discoloration and durability of the combustion cylinder 11 such as locally overheating the combustion cylinder 11 can be solved.

Further, it is possible to prevent deterioration of exhaust gas performance caused by sucking out the combustion gas in the combustion cylinder 11 from the air intake hole 16 ′ at the rearmost side (the side closest to the convection blower 14).

At the same time, the amount of air introduced from the combustion cylinder duct right 17a and the left 17b is evenly distributed, so that the remaining air amount from the convection blower can be equalized left and right, and the air can be discharged from the air outlet 18 to the outside of the room. The warm air discharged can also have a comfortable warm air performance that is well-balanced and does not have uneven temperature.

EFFECTS OF THE INVENTION As described above, according to the present invention, the upper surface of the combustion cylinder duct is closed as a plate-shaped portion having no hole, and the blowing force generated by the rotation of the convection blower acts on the side on which the blowing force is applied. Since the negative pressure effect of the is asymmetrical to the side of the convection blower that does not work in the air intake hole of the combustion cylinder, it is possible to introduce the combustion air uniformly into the combustion cylinder, and of course, for convection. It is also possible to prevent the combustion gas from being sucked out by the blowing force of the air flow from the blower, so that the exhaust gas performance can be improved and the durability of the fuel cylinder can be improved.

[Brief description of drawings]

1 to 3 are cross-sectional views of main parts showing an embodiment of the warm air heater of the present invention, FIG. 4 is a cross-sectional view of the same, and FIGS. 5 (a) and 5 (b) are the same combustion cylinder ducts. FIG. 6 is a side view and a plan view, FIG. 6 to FIG. 8 are cross-sectional views of main parts of a conventional example, and FIG. 1 ... Vaporization cylinder, 8 ... Flame holding plate, 11 ... Combustion cylinder, 14 ...
... convection blower, 15 ... propeller fan, 16 ... air intake hole, 17a ... combustion tube duct right, 17b ... combustion tube duct left, 18 ... blowout port.

Claims (1)

[Claims] 1. A burner portion comprising a vaporizing cylinder for thermally vaporizing liquid fuel and a flame holding plate for burning the vaporized gas, and a cylindrical shape provided above the burner portion so as to cover the burner portion, and having a lower peripheral surface. A combustion cylinder provided with a plurality of air intake holes for taking in the air for the next combustion, an outlet for warm air that has exchanged heat with the combustion cylinder, and an air for warm air and the air intake that faces the combustion cylinder. A convection blower for a propeller fan that sends air to the air intake hole, and a horseshoe shape that is provided on the outer peripheral surface of the lower part of the combustion cylinder so as to cover the air intake hole and guides the secondary combustion air to the air intake hole. The combustion cylinder duct has a closed upper surface of the combustion cylinder duct as a plate-shaped portion without holes, and the side on which the blowing force generated by the rotation of the convection blower acts is dependent on the blowing force. Negative pressure action acts on the air intake hole of the combustion cylinder Warm-air heating machine, which was asymmetrical close to the convection blower side to the place no.