JP3530266B2 - Hot air heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air heater such as an oil fan heater and a gas fan heater.

[0002]

2. Description of the Related Art A conventional hot air heater of this type is, for example,
As disclosed in Japanese Utility Model Publication No. 1-20511,
A wind tunnel (air passage forming body) is provided in the main body case having a warm air outlet and a convection blower, and a combustion cylinder with an open upper part is provided in the wind tunnel, and a shield is provided between the combustion cylinder and the top of the wind tunnel. By providing the hot plate, the combustion gas flowing out from the open portion in the upper part of the combustion cylinder and the air flow sent from the convection blower are mixed in the wind tunnel, and warm air is blown into the room from the hot air outlet to heat the room. The heat shield guides a part of the wind of the convection blower near the top of the wind tunnel to cool the top of the wind tunnel and suppress the temperature rise in the upper part of the main body case.

By the way, in recent years, it has been desired to make the warm air heater as described above compact, but in order to make it compact, the combustion cylinder and the convection blower must be brought close to each other, so that the convection blower is required. There was a problem that the rotating shaft of the above became abnormally high temperature due to the heat effect of the combustion cylinder, the lubricating oil of the bearing portion was evaporated or hardened, and the rotating shaft did not rotate smoothly. Therefore, conventionally, a protective plate is hung from the rear edge of the heat shield plate to cover the front of the convection blower so that the rotating shaft does not have an abnormally high temperature. However, if the front side of the convection blower is covered with this protective plate, fresh air cannot be introduced into the open part of the combustion cylinder, and the air supply amount of the combustion blower is insufficient due to filter clogging, etc. The flame of No. 6 becomes a red flame and extends for a long time, and if that flame flows out from the open part of the combustion cylinder, it is not possible to shorten the flame, and the flame goes out from the hot air outlet,
There is a problem that the amount of carbon monoxide generated increases.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned facts, and while suppressing the temperature rise of the rotary shaft of a convection blower, solves the problem at the time of insufficient air supply and is always good. It is an object of the present invention to provide a hot air heater capable of performing various combustions and preventing overheating of the main body case.

[0005]

DISCLOSURE OF THE INVENTION As a result of intensive studies to solve the above-mentioned problems, the present invention provides the air blown from a convection blower between the open portion of the combustion cylinder and the heat shield plate, and the heat shield plate. It has been found that the above problems can be solved by providing an air flow distribution plate extending downward at the rear edge of the heat shield plate so that the air can be appropriately distributed and sent between the wind tunnel and the top of the wind tunnel, and the present invention has been completed. Is.

According to the first aspect of the present invention, there is provided a main body case having a hot air outlet and a convection blower, a wind tunnel provided in the main body case, and an upper open combustion cylinder provided in the wind tunnel. A burner provided in the lower part of the combustion cylinder, and a heat shield plate provided between the combustion cylinder and the wind tunnel top, and extends downward to the rear edge of the heat shield plate to blow air from the convection blower. An air flow distribution plate that distributes the air to be distributed between the open portion of the combustion cylinder and the heat shield plate and between the heat shield plate and the top of the wind tunnel is provided to open the combustion cylinder.
The distance (L1) between the upper end of the discharge part and the lower end of the air flow distribution plate, combustion
Distance between the upper end of the open part of the cylinder and the rotating shaft of the convection blower
(L2), and between the upper end of the open portion of the combustion cylinder and the heat shield plate
Ratio of intervals (L3) L1: L2: L3 = 1: (1.5-
2.5): A warm air heater characterized by being (3.0 to 4.0) .

According to a second aspect of the present invention, a main body case having a hot air outlet and a convection blower, a wind tunnel provided in the main body case, and an upper open combustion cylinder provided in the wind tunnel. A burner provided in the lower part of the combustion cylinder, and a heat shield plate provided between the combustion cylinder and the wind tunnel top, and extends downward to the rear edge of the heat shield plate to blow air from the convection blower. An air flow distribution plate is provided for distributing the air to be distributed between the open portion of the combustion cylinder and the heat shield plate, and between the heat shield plate and the wind tunnel top, and the air flow distribution plate is provided .
The bottom end of the convection blower
The air flow distribution plate is provided with an opening portion of the combustion cylinder.
The temperature is characterized by the provision of a ventilation section located above
It is a wind heater .

[0008]

[0009]

[0010]

[0011]

According to the present invention, the rotating shaft is not overheated by the radiant heat from the combustion cylinder, the temperature rise of the rotating shaft can be suppressed, and the harmful effect due to the temperature rise of the rotating shaft is eliminated. it can. Also, even if the air supply becomes insufficient due to filter clogging, the flame of the burner becomes red fire, and it extends for a long time and flows out from the open part of the combustion tube, the air flow distribution plate acts to blow air from the convection blower. Since air is distributed and sent between the open part of the combustion tube and the heat shield and between the heat shield and the wind tunnel top, the outflowing flame is shortened with fresh air.
In addition to being able to prevent the flame from going out from the hot air outlet, it is also possible to suppress the sudden increase in carbon monoxide that occurs when the air supply is insufficient and to perform stable combustion, and also to prevent the body case from overheating. . In addition, it is necessary to suppress the temperature rise of the rotating shaft.
To solve the problem of insufficient air supply for better combustion
It is possible to prevent overheating of the main body case. Ratio L
1: L2: L3 = 1: (1.5 to 2.5) :( 3.0 to
4.0), preferably the ratio L1: L2: L3 = 1: (1.
7-2.3): (3.2-3.8), particularly preferably the ratio
L1: L2: L3 = 1: (1.8 to 2.1) :( 3.3
~ 3.5). If L2 is less than 1.5, propeller
Is between the upper end of the open part of the combustion cylinder and the lower end of the air flow distribution plate.
Away from the combustion chamber, the amount of air blown to the opening of the combustion tube is reduced.
It is not preferable because it is too much. Conversely, when L2 exceeds 2.5
The propeller fan is connected to the upper end of the open part of the combustion cylinder and the air flow distribution plate.
Since it approaches the lower end, the amount of air blown to the opening of the combustion tube
Too many. If L3 is less than 3.0, heat shield and wind tunnel top
The amount of air blown between the two parts increases, and the air is blown to the opening of the combustion tube.
The quantity is reduced. Heat shield and wind tunnel when L3 exceeds 4.0
The amount of air blown between the tops is reduced, causing the body case to overheat.
It

According to the second aspect of the invention, the convection blower is provided.
The front of the rotating shaft of the machine is covered by the air flow distribution plate,
The rolling shaft is not directly heated by the radiant heat from the combustion cylinder.
In addition, the temperature rise of the rotating shaft can be suppressed,
It is possible to eliminate the harmful effects caused by the temperature rise. Also in the filter
The burner flame becomes red due to lack of air supply due to clogging, etc.
When it becomes a fire, it extends for a long time and flows out from the open part of the combustion tube
But, whether the convection blower is through the vent to the leaked flame
It is possible to supply fresh air from the
So that the flame does not go out from the hot air outlet.
Even if you can do it, the sudden rise of carbon monoxide that occurs when the air supply is insufficient
Stable combustion while suppressing the increase
It is possible to prevent the body case from overheating.

[0013]

[0014]

[0015]

[0016]

The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory diagram showing the overall configuration of a warm air heater showing an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the same main part.

1 and 2, reference numeral 1 denotes a box-shaped main body case having a warm air blowout port 2 in the lower front part and a convection blower 3 in the back part. One end of the main body case 1 is the warm air blower. A wind tunnel 4 is arranged which communicates with the outlet 2 and has the other end communicating with the convection blower 3. Arrows indicate the flow of air. Reference numeral 5 denotes a burner arranged in the lower part of the main body case 1 to vaporize and burn the petroleum fuel. The burner 5 includes a vaporization cylinder 5A, a burner head 5B mounted on the vaporization cylinder 5A, and a vaporization cylinder 5A. It is composed of a burner case 5C surrounding the periphery and a combustion blower 5D for supplying combustion secondary air into the burner case 5C and supplying combustion primary air into the vaporization cylinder 5A. Further, the suction port 5R of the combustion blower 5D is desired outside the main body case 1, and a filter (not shown) is provided at the suction port.
Is provided. 5E is a motor for the blower for combustion 5D, 5F is a photo sensor having a light emitting part and a light receiving part for detecting the number of rotations of the rotating shaft of the motor 5E, 5G is a combustion secondary air supply passage, and 5H is a combustion primary air supply. A passage, 5I is a nozzle for supplying the liquid fuel to the vaporization cylinder 5A, 5J is a burner ring, 5K is a heat recovery projection provided facing the flame hole of the burner head 5B, and 5M is a frame sensor.

Reference numeral 6 denotes a combustion cylinder which is provided in the wind tunnel 4 and has an open upper portion. The combustion cylinder 6 is provided upright on the bottom portion 4A of the wind tunnel 4 so as to cover the periphery of the upper portion of the burner 5, Combustion gas is made to flow out through the opening 7 in the upper part. The convection blower 3 is composed of a motor 3A fixed to a fan guard 8 that also serves as a filter, and a propeller fan 3B attached to a rotating shaft 9 of the motor 3A, and the propeller fan 3B is opposed to the combustion cylinder 6. There is.

Reference numeral 10 denotes a heat shield plate made of an aluminum-plated steel plate provided between the combustion cylinder 6 and the top portion 4B of the wind tunnel 4. The heat shield plate 10 has its front portion and rear portion slantingly downward. The front portion 10A and the rearwardly inclined portion 10B are bent.
3 is formed, and as shown in FIG. 3, at both ends of the front portion 10A, fixing piece portions 10D having claws and screw holes for fixing the heat shield plate 10 to the side wall of the wind tunnel 4 are formed.
Both sides of the heat shield plate 10 are bent downward at right angles to form side pieces 10C and 10C, and fixed side portions 10E are bent obliquely downward on both sides of the side pieces 10C and 10C. 10E, 10E, 10E are formed, and the tips of these fixing pieces 10E ... Are inserted into the side wall of the wind tunnel 4 and fixed. A guide 10F is fixed to one side piece 10C (not shown) by welding.

Further, the rearwardly inclined portion 1 which is gently inclined
At the rear edge of 0B, an air volume distribution plate 11A extended downward is formed by bending, and the heat shield plate 10 on the side where more air from the convection blower 3 is blown.
An L-shaped member 11B having a lower end extending to the vicinity of the rotating shaft 9 of the convection blower 3 and fixed to the corner of the trailing edge by welding. The air volume distribution plate 11 includes an air volume distribution plate 11A and an L-shaped member 11B. This air flow distribution plate 11
A ventilation port 1 is provided between the lower end of A and the upper end of the opening 7 of the combustion tube 6.
2 is formed. Reference numeral 14 is an auxiliary heat shield plate made of an aluminum-plated steel plate provided between the heat shield plate 10 and the top portion 4B of the wind tunnel 4. The auxiliary heat shield plate 14 is a convection blower on the lower surface of the top portion 4B of the wind tunnel 4. It is for guiding the wind from 3 to further enhance the cooling effect, and is fixed to the lower surface of the top portion 4B of the wind tunnel 4 by spot welding.

Reference numeral 6A is a viewing window provided on the front surface of the combustion cylinder 6. The viewing window 6A is configured such that the mica plate 6C is closely attached and fixed to the outer surface of the combustion tube 6 by a fixture 6B. It is preferable that the transparent member for peep of the peep window 6A has heat resistance and sufficient strength. For example, if glass is used instead of the mica plate 6C, it will be damaged by heat of combustion. Mica plate 6C
Is intimately fixed to the outer surface of the combustion cylinder 6, gas will leak from the inside of the combustion cylinder 6 and carbon monoxide will be generated, so it is important to fix it in close contact. . In FIG. 1, F indicates the flame during normal combustion, and FX indicates the flame during abnormal combustion due to insufficient air supply.

In the above structure, the open portion 7 of the combustion cylinder 6
The distance L1 between the upper end and the lower end of the air volume distribution plate 11A is about 7 mm,
The distance L2 between the upper end of the open portion 7 of the combustion cylinder 6 and the rotary shaft 9 of the convection blower 3 is about 13 mm, and the distance L3 between the upper end of the open portion 7 of the combustion cylinder 6 and the heat shield plate 10 is about 24 mm. L
1: L2: L3 = 1: about 1.9: about 3.4. The distance L4 between the lower end of the front portion 4C of the wind tunnel 4 and the upper end of the opening 7 of the combustion tube 6 is about 20 mm, and the inner diameter of the combustion tube 6 is about 156.
The height h1 from the bottom 4A of the wind tunnel 4 to the tip of the opening 7 of the wind tunnel 4 was 150 mm, and the height h2 from the bottom 4A of the wind tunnel 4 to the top 4B of the wind tunnel 4 was 215 mm.

In the above structure, the combustion gas produced by the combustion of the burner 5 rises in the combustion cylinder 6, passes through the upper opening 7 of the combustion cylinder 6 and is discharged into the wind tunnel 4 below the heat shield plate 10, and the main body case 1 Is mixed with the air sent from the convection blower 3 provided at the back of the, and becomes hot air and is blown out from the hot air outlet 2 to heat the room. The temperature of the rotary shaft can be suppressed by the air sent from the convection blower 3, and the air blown from the convection blower 3 allows the air blown from the convection blower 3 to shield the open portion 7 of the combustion cylinder 6 and the heat shield. Since it is appropriately distributed and sent between the plates 10 and between the heat shield plate 10 and the wind tunnel top 4B, stable combustion can be performed and the main body case 1 can be prevented from overheating.

By the way, the suction port 5R of the blower 5D for combustion
If a filter (not shown) provided in the fuel cell is clogged or clogged by a curtain or the like, the supply amount of the combustion primary air into the vaporization cylinder 5A decreases, and the supply air is insufficient. At this time, the flame F formed on the burner head 5B becomes a red flame, which extends for a long time like the flame FX shown by the phantom line in FIG. 1 and flows out from the upper opening 7 of the combustion cylinder 6, but from the convection blower 3. Since a part of the blown air is introduced into the space between the upper opening 7 of the combustion cylinder 6 and the heat shield plate 10 through the ventilation hole 12 by the action of the air volume distribution plate 11, the upper opening 7
Fresh air is supplied at a right angle to the outflowing flame FX, and this fresh air accelerates combustion of the flame FX to shorten the flame, and the flame does not come out from the hot air outlet 2. Further, since the combustion of carbon monoxide in the flame FX is promoted to become carbon dioxide, the generation of carbon monoxide can be reduced.

FIG. 4 is an explanatory view showing another example of the heat shield plate used in the present invention. The same reference numerals as those of the heat shield plate 10 shown in FIG. 3 indicate the same parts. The heat shield plate 10a provided between the combustion cylinder 6 and the top portion 4B of the wind tunnel 4 is provided with an air flow distribution plate 11a at its rear edge, the lower end of which extends below the rotary shaft 9 of the convection blower 3. There is. The air flow distribution plate 11a is provided with a ventilation portion 12a located above the open portion 7 of the combustion cylinder 6. Although the ventilation part 12a has a rectangular shape, it may have any shape such as a circle, an ellipse, a square, and a triangle.

With this structure, the front of the rotating shaft 9 of the convection blower 3 is covered with the air flow distribution plate 11a, so that the rotating shaft 9 is not directly heated by the radiation heat from the combustion cylinder 6. The temperature rise of the rotating shaft 9 can be suppressed, and the lubricating oil of the bearing portion is evaporated or hardened due to the temperature rise of the rotating shaft 9 to prevent the rotating shaft 9 from not rotating smoothly. it can. Further, even if the air supply becomes insufficient due to clogging of the filter, the flame of the burner 5 becomes a red flame, and the flame extends for a long time and flows out from the upper opening 7 of the combustion cylinder 6, the outflowing flame FX is convected through the ventilation port 12a. Because the fresh air from the blower 3 can be supplied,
The outflowing flame shortens the fresh air, and the flame is warm air outlet 2
It is possible to prevent the carbon monoxide from going out of the room, and it is possible to suppress a rapid increase in carbon monoxide that occurs when the air supply is insufficient.
Further, in this embodiment, since the notches 13 and 13 are provided at the upper end portion of the air volume distribution plate 11a, it is possible to suppress the heat of the heat shield plate 10a from being transferred to the air volume distribution plate 11a, and the rotary shaft 9 is further improved. The temperature rise can be suppressed.

Further, in the above embodiment, the air flow distribution plate 1
Since 1A and 11a are integrally formed with the heat shield plates 10 and 10a, the number of parts can be reduced and the configuration can be simplified.

FIG. 5 is an explanatory view showing an enlarged main part of the burner 5 which can be preferably used in the present invention. The burner 5 is provided on the vaporization cylinder 5A, the burner head 5B mounted on the vaporization cylinder 5A, and the outer periphery of the burner head 5B.
A burner ring 5J having a comb-shaped annular wall facing the flame holes of the burner head 5B and having a large number of slits S from the upper end toward the root, and mixing ejected from the flame holes of the burner head 5B. A spark plug 5L that ignites the air,
A flame sensor 5M is provided, and insulators of the spark plug 5L and the flame sensor 5M are provided outside the comb tooth-shaped annular wall. The comb tooth-shaped annular wall is provided with an insulator portion of the spark plug 5L and the frame sensor 5M. In the configuration, the insulator protection portions 5P, 5Q having no slit S or having a slit shallower than the other portions are formed in the facing portions. 5N is a sheathed heater for heating.

According to this structure, the flame formed in the flame hole becomes small when the combustion is weak, and the air flows from the slit S of the comb-shaped annular wall into the inside of the comb-shaped annular wall. The combustion reaction of the flame is promoted by the air that has flowed into the inside of the annular wall, and good weak combustion with a small amount of carbon monoxide generated can be performed, and at the time of strong combustion, the flame formed in the flame hole becomes large, and this flame Since the comb-shaped annular wall takes away the heat of, the flame temperature drops and the amount of NOx generated decreases. In addition, on the comb-shaped annular wall, the insulator protection portion 5 is provided at a portion facing the insulator portion of the spark plug 5L and the frame sensor 5M.
Since P and 5Q are formed, the insulator protection portions 5P and 5Q can catch the flame and direct the flow of the flame upward, so that the temperature of the insulator of the spark plug 5L and the flame sensor 5M becomes higher than the heat resistant temperature. There is no fear of rising, and thermal damage to the spark plug 5L and the flame sensor 5M is reliably prevented with a simple configuration.

FIG. 6 is an explanatory view showing an enlarged main part of the vaporizing cylinder 5A of the burner 5 which can be preferably used in the present invention. This is a configuration in which a plurality of heat recovery projections 5K facing the flame holes of the burner head 5B are provided at the upper end of a bottomed cylindrical vaporization cylinder 5A into which liquid fuel and combustion air are supplied. 5N is a sheathed heater for heating.

According to this structure, the fire becomes small when the combustion is weak, and the flame approaches the flame hole portion of the burner head 5B. Therefore, the burner head 5B and the upper end of the vaporizing cylinder 5A are sufficiently heated by the flame in the flame contact state. The vaporization section can be heated and maintained at a temperature suitable for vaporization of fuel. On the other hand, at the time of strong combustion, the flame becomes large and the high temperature part of the flame separates from the flame hole part, but the plurality of (6 in the example) heat recovery projections 5K provided at the upper end of the vaporization cylinder 5A Heat recovery boss part 5 wrapped in a high temperature part and heated, and then heated to a high temperature
Since the heat of K can be transmitted to the vaporization section, the amount of heat recovery at the time of strong combustion can be dramatically increased.

As shown in FIG. 6, each of the heat recovery projections 5K has a columnar shape and a diameter T of about 6 to 8 mm.
In addition, the height H is set to about 8 to 10 mm, and the upper end of the annular vaporization cylinder 5A is provided with a large interval s of about 25 to 35 mm substantially equal to each other in the circumferential direction. It is formed integrally with the vaporizing cylinder 5A.

As described above, the temperature variation width of the vaporizing cylinder 5A can be reduced in a wide range from strong combustion to weak combustion, combustion is stable over a wide range from strong combustion to weak combustion, and flame current can be stabilized. At the same time, the amount of carbon monoxide generated is reduced, and the flame temperature is lowered by the heat recovery action of the heat recovery boss 5K, whereby nitrogen oxides can be reduced and the combustion range can be greatly expanded.

[0034]

The hot-air heater according to the first aspect of the present invention can eliminate the harmful effects caused by the temperature rise of the rotating shaft, and even if the air supply is insufficient due to the clogging of the filter, the air flow distribution plate can be used. The air blown from the convection blower is distributed between the open part of the combustion cylinder and the heat shield plate and between the heat shield plate and the top of the wind tunnel, so the outflowing flame is shortened with fresh air, and the flame It is possible to prevent the hot air blowout port from coming out to the outside, suppress a sharp increase in carbon monoxide that occurs when the air supply is insufficient, and perform stable combustion, and prevent the main body case from overheating. Also, suppressing the temperature rise of the rotating shaft
While solving the problem of insufficient air supply, better combustion
This can be done and the main body case can be prevented from overheating.

[0035]

[0036]

The hot air heater according to claim 2 is as described in claim 1.
In addition to the effect of, the front of the rotary shaft of the convection blower is covered by the air volume distribution plate, so the rotary shaft is not directly heated by the radiant heat from the combustion cylinder, and the temperature rise of the rotary shaft can be suppressed. Therefore, it is possible to eliminate the adverse effect caused by the temperature rise of the rotating shaft.

[0038]

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of a warm air heater showing an embodiment of the present invention.

FIG. 2 is likewise a longitudinal sectional view of an essential part.

FIG. 3 is a perspective view of the heat shield as seen obliquely from the rear.

FIG. 4 is a perspective view of another heat shield as seen obliquely from behind.

FIG. 5 is an explanatory diagram similarly showing an enlarged main part of the burner.

FIG. 6 is an explanatory view showing an enlarged main part of the vaporization cylinder in the same manner.

[Explanation of symbols]

1 ・ ・ Main body case, 2 ・ ・ Warm air outlet, 3 ・ ・ Convection blower, 4 ・ ・ Wind drum, 4B ・ ・ Top of wind drum, 5 ・ ・ Burner, 6 ・ ・ Combustion cylinder, 7 ・ ・ Upper opening Part (open part), 8 ・
・ Fan guards, 9 ・ ・ Rotary shafts, 10, 10a ・ ・ Heat shields, 11A, 11, 11a ・ ・ Air flow distribution plates, 11B ・ ・
L-shaped member, 12, 12a ... Vent (vent).

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24H 3/04 301 F24H 9/00

Claims (2)

(57) [Claims] 1. A main body case having a hot air outlet and a convection blower, a wind tunnel provided in the main body case, an upper open combustion cylinder provided in the wind cylinder, and a lower part in the combustion cylinder. A burner provided and a heat shield plate provided between the combustion cylinder and the top of the wind tunnel are provided, and the air blown from the convection blower is opened to the combustion cylinder by extending downward to the rear edge of the heat shield plate. Between the heat shield plate and the heat shield plate, and between the heat shield plate and the top of the wind tunnel, an air flow distribution plate is provided , and the upper end of the open portion of the combustion cylinder and the air flow distribution plate are provided .
The interval (L1) from the lower end, the upper end of the open part of the combustion cylinder and the convection
Distance (L2) from the rotating shaft of the blower for air, and opening of the combustion cylinder
Ratio L1: L of the distance (L3) between the upper end of the discharge part and the heat shield plate
2: L3 = 1: (1.5 to 2.5) :( 3.0 to 4.
A hot air heater characterized in that it is 0) . 2. A main body case having a warm air outlet and a convection blower, a wind tunnel provided in the main body case, an upper open combustion cylinder provided in the wind cylinder, and a lower portion in the combustion cylinder. A burner provided and a heat shield plate provided between the combustion cylinder and the top of the wind tunnel are provided, and the air blown from the convection blower is opened to the combustion cylinder by extending downward to the rear edge of the heat shield plate. Between the heat shield plate and the heat shield plate, and between the heat shield plate and the top of the wind tunnel, an air flow distribution plate is provided , and the lower end of the air flow distribution plate is the convection blower.
It is provided so as to extend below the rotation axis of the
Ventilation part located on the plate above the open part of the combustion cylinder
A warm air heater characterized by being provided with.